FN Thomson Reuters Web of Science™ VR 1.0 PT J AU MCKITTRICK, J TUNABOYLU, B KATZ, J AF MCKITTRICK, J TUNABOYLU, B KATZ, J TI MICROWAVE AND CONVENTIONAL SINTERING OF RAPIDLY SOLIDIFIED AL2O3-ZRO2 POWDERS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID ALUMINA AB The Al2O3-ZrO2 eutectic composition was rapidly solidified, forming amorphous and crystalline structures. The as-quenched material was crushed and pressed into pellets which were sintered conventionally or with microwaves. Conventional and microwave sintering at temperatures up to 1600-degrees-C resulted in a microstructure where 100-200 nm ZrO2 grains were present intergranularly in the alpha-Al2O3 grains. Larger ZrO2 grains (approximately 1 mum) were found intergranularly. The as-quenched lamellar structure spheroidized during sintering at high temperatures. Boron contamination of the powders resulted in more homogeneous and dense as-fired samples but promoted the ZrO2 tetragonal-to-monoclinic transformation, which was attributed to increased grain boundary diffusivity. Conventional sintering at low temperatures resulted in the formation of ''rods'' of an Al2O3-rich phase which grew from a low-melting B2O3-rich liquid. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP MCKITTRICK, J (reprint author), UNIV CALIF SAN DIEGO,MAT SCI PROGRAM,LA JOLLA,CA 92093, USA. NR 17 TC 9 Z9 9 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 APR 15 PY 1994 VL 29 IS 8 BP 2119 EP 2125 DI 10.1007/BF01154689 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA NJ064 UT WOS:A1994NJ06400019 ER PT J AU RAWERS, JC FRISK, K GOVIER, D AF RAWERS, JC FRISK, K GOVIER, D TI NITROGEN IN PRESSURE-DIFFUSED POWDER IRON-ALLOYS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID NI-N SYSTEM; THERMODYNAMIC EVALUATION; STEELS AB In this study, high-pressure high-temperature diffusion at the US Bureau of Mines was used to increase the nitrogen concentration in both b.c.c.- and f.c.c.-iron alloy powders. Microstructures of the powders and precipitates were determined using microprobe, scanning electron microscopy (SEM) and X-ray diffraction. Formation of Fe4N was observed in Fe, Fe-1018, and Fe-2Al. For Fe-Cr alloys, either b.c.c. or f.c.c., the first precipitate to form was CrN. Experimental results compared favourably with computer generated phase diagrams and computer predictions from the Swedish Institute for Metals Research of nitrogen concentration and as a function of diffusion pressures. C1 ROYAL INST MET,S-11428 STOCKHOLM,SWEDEN. RP RAWERS, JC (reprint author), US BUR MINES,ALBANY RES CTR,1450 QUEEN AVE SW,ALBANY,OR 97321, USA. OI Frisk, Karin/0000-0001-9407-9140 NR 28 TC 7 Z9 7 U1 0 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 APR 15 PY 1994 VL 177 IS 1-2 BP 243 EP 251 DI 10.1016/0921-5093(94)90496-0 PG 9 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA NE257 UT WOS:A1994NE25700025 ER PT J AU THOMPSON, RB LEE, SS LI, Y SAYERS, CM AF THOMPSON, RB LEE, SS LI, Y SAYERS, CM TI ULTRASONIC AND NEUTRON-DIFFRACTION CHARACTERIZATION OF TEXTURE IN AN INHOMOGENEOUSLY ROLLED TITANIUM PLATE SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID ELECTROMAGNETIC ACOUSTIC TRANSDUCERS; SH-WAVE VELOCITY; ANGULAR-DEPENDENCE; METAL SHEETS; ANISOTROPY; ALLOYS AB Deviations from orthotropic symmetry have been reported (R. B. Thompson, J.F. Smith and S. S. Lee, J. Acoust. Soc. Am., 80(1986)921) in the angular variation of the apparent velocities of ultrasonic guided modes propagating in a rolled titanium sheet. Additional ultrasonic and neutron diffraction measurements are presented which reveal those results to be a consequence of a subtle textural inhomogeneity, apparently developed as a result of non-uniform rolling across the sheet width. Ultrasonic and neutron diffraction measurements in material representative of the two sides of the sheet are reported which quantify the differences in the structure of the two sides. A theory is then presented which predicts the apparent angular dependence of the ultrasonic velocity in such a sheet, modeled as two adjacent homogeneous regions with slightly different properties. When the texture parameters in that theory are set equal to the values deduced from the neutron diffraction measurements, good agreement with the observed apparent velocities is obtained. These results illustrate the importance of sample homogeneity in ultrasonic texture analysis and the high sensitivity of the ultrasonic technique to small changes in texture. C1 IOWA STATE UNIV SCI & TECHNOL,COLL ENGN,AMES,IA 50011. AERE,HARWELL LABS,DIV MAT PHYS & MET,HARWELL OX11 0RA,OXON,ENGLAND. RP THOMPSON, RB (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. OI Sayers, Colin/0000-0002-2839-4238 NR 24 TC 2 Z9 2 U1 2 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 APR 15 PY 1994 VL 177 IS 1-2 BP 261 EP 267 DI 10.1016/0921-5093(94)90498-7 PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA NE257 UT WOS:A1994NE25700027 ER PT J AU HAAS, RA BANKS, PS AF HAAS, RA BANKS, PS TI GENERATION OF HIGH-INTENSITY BROAD-BANDWIDTH LIGHT FOR INERTIAL CONFINEMENT FUSION SO OPTICS COMMUNICATIONS LA English DT Article ID ND-GLASS LASER; INDUCED SPATIAL INCOHERENCE; SCALE-LENGTH PLASMAS; HIGH-POWER; PARAMETRIC-INSTABILITY; SMOOTHING TECHNIQUES; BEAM; FILAMENTATION; SIMULATION; SCATTERING AB It is suggested that three-wave parametric fluorescence in optically anisotropic crystals, e.g. KDP, may be used to generate high intensity (greater-than-or-equal-to 1 GW/cm3), broad-bandwidth (DELTAlambda/lambda less-than-or-equal-to 5-10%) light with small divergence (less-than-or-equal-to 100 murad) in the near infrared to midvisible spectral regions. Larger fractional bandwidths and shorter wavelengths may be achieved by modification of crystal optical properties and harmonic conversion or sum frequency generation, respectively. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP HAAS, RA (reprint author), UNIV CALIF DAVIS,DEPT APPL SCI,L-794,POB 808,LIVERMORE,CA 94550, USA. NR 34 TC 6 Z9 6 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD APR 15 PY 1994 VL 107 IS 3-4 BP 265 EP 270 DI 10.1016/0030-4018(94)90034-5 PG 6 WC Optics SC Optics GA NF500 UT WOS:A1994NF50000019 ER PT J AU GARRETT, WR BARNETT, VW MOORE, MA PAYNE, MG AF GARRETT, WR BARNETT, VW MOORE, MA PAYNE, MG TI OBSERVATIONS OF PREDICTED COOPERATIVE SHIFTS IN OPTICALLY PUMPED STIMULATED EMISSIONS IN XE SO OPTICS LETTERS LA English DT Article ID INTERFERENCE; SUPPRESSION; RESONANCE; IONIZATION; EXCITATION AB In a recent study Garrett showed that stimulated emissions can be suppressed and shifted under the influence of a wave-mixing interference [Phys. Rev. Lett. 70, 4059 (1993)]. We observe the predicted pressure-dependent frequency shifts in optically pumped stimulated emissions from Xe. C1 DAVIDSON COLL,DEPT PHYS,DAVIDSON,NC 28036. GEORGIA SO UNIV,DEPT PHYS,STATESBORO,GA 30460. RP GARRETT, WR (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 17 TC 10 Z9 10 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 APR 15 PY 1994 VL 19 IS 8 BP 581 EP 583 DI 10.1364/OL.19.000581 PG 3 WC Optics SC Optics GA NF316 UT WOS:A1994NF31600023 PM 19844379 ER PT J AU STECHEL, EB WILLIAMS, AR FEIBELMAN, PJ AF STECHEL, EB WILLIAMS, AR FEIBELMAN, PJ TI N-SCALING ALGORITHM FOR DENSITY-FUNCTIONAL CALCULATIONS OF METALS AND INSULATORS SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE CALCULATIONS; MOLECULAR-DYNAMICS; VALENCE-BOND; SYSTEMS; MINIMIZATION AB An algorithm for minimization of the density-functional energy is described that replaces the diagonalization of the Kohn-Sham Hamiltonian with block diagonalization into explicit occupied and partially occupied (in metals) subspaces and an implicit unoccupied subspace. The progress reported here represents an important step toward the simultaneous goals of linear scaling, controlled accuracy, efficiency, and transferability. The method is specifically designed to deal with localized, nonorthogonal basis sets to maximize transferability and state-by-state iteration to minimize any charge-sloshing instabilities. It allows the treatment of metals, which is important in itself, and also because the dynamics of ''semiconducting'' systems can result in metallic phases. The computational demands of the algorithm scale as the particle number, permitting applications to problems involving many inequivalent atoms. C1 IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. SANDIA NATL LABS,SURFACE & INTERFACE SCI MS0344,ALBUQUERQUE,NM 87185. RP STECHEL, EB (reprint author), SANDIA NATL LABS,ADV MAT PHYS MS0345,ALBUQUERQUE,NM 87185, USA. RI Stechel, Ellen/B-1253-2012 NR 29 TC 93 Z9 93 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 APR 15 PY 1994 VL 49 IS 15 BP 10088 EP 10101 DI 10.1103/PhysRevB.49.10088 PG 14 WC Physics, Condensed Matter SC Physics GA NJ756 UT WOS:A1994NJ75600003 ER PT J AU WANG, LW AF WANG, LW TI CALCULATING THE DENSITY-OF-STATES AND OPTICAL-ABSORPTION SPECTRA OF LARGE QUANTUM-SYSTEMS BY THE PLANE-WAVE MOMENTS METHOD SO PHYSICAL REVIEW B LA English DT Article AB The moments method is used to calculate the density of states and optical-absorption spectra of large quantum systems. This method uses random wave functions to calculate 500 Chebyshev moments of the density of states (500(2)for the optical-absorption spectra), and transforms these moments back to energy space. The results compare well with direct calculations on a large, 2048 Si-atom bulklike supercell system. To demonstrate its utility, the spectra of a realistic quantum dot with 1035 Si and 452 H atoms are calculated using an empirical pseudopotential Hamiltonian and a plane-wave basis of wave functions. RP NATL RENEWABLE ENERGY LAB, GOLDEN, CO 80401 USA. NR 18 TC 92 Z9 92 U1 0 U2 4 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 APR 15 PY 1994 VL 49 IS 15 BP 10154 EP 10158 DI 10.1103/PhysRevB.49.10154 PG 5 WC Physics, Condensed Matter SC Physics GA NJ756 UT WOS:A1994NJ75600009 ER PT J AU FEIBELMAN, PJ NELSON, JS KELLOGG, GL AF FEIBELMAN, PJ NELSON, JS KELLOGG, GL TI ENERGETICS OF PT ADSORPTION ON PT(111) SO PHYSICAL REVIEW B LA English DT Article ID TOTAL-ENERGY CALCULATIONS; EMBEDDED-ATOM-METHOD; SURFACE SELF-DIFFUSION; INTERATOMIC POTENTIALS; METAL-SURFACES; SINGLE ADATOMS; LATTICE-RELAXATION; IR(111); MODEL; CU AB First-principles local-density-functional (FP-LDF) and embedded-atom-method (EAM) total energies, for a single Pt atom adsorbed on Pt(111), are compared to each other and to field-ion-microscope (FIM) observations. Our EAM calculations predict a small barrier to diffusion and only a slight energy difference between adsorption in the fcc and hcp threefold hollows (both smaller than 1 meV). They correspond poorly to the results of the FP-LDF calculations, which imply a diffusion barrier of 0.38 eV for passage over a bridge, and a preference of 0.18 eV for the fcc against the hcp site. FIM measurements yield a diffusion barrier of (0.25+/-0.02) eV, and imply that binding in the fcc site is preferred. RP FEIBELMAN, PJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 60 TC 90 Z9 91 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 APR 15 PY 1994 VL 49 IS 15 BP 10548 EP 10556 DI 10.1103/PhysRevB.49.10548 PG 9 WC Physics, Condensed Matter SC Physics GA NJ756 UT WOS:A1994NJ75600057 ER PT J AU PRUSKI, M LANG, DP HWANG, SJ JIA, H SHINAR, J AF PRUSKI, M LANG, DP HWANG, SJ JIA, H SHINAR, J TI STRUCTURE OF THIN DIAMOND FILMS - A H-1 AND C-13 NMR-STUDY SO PHYSICAL REVIEW B LA English DT Article ID POLYCRYSTALLINE DIAMOND; INFRARED-ABSORPTION; NMR; POLARIZATION; HYDROGEN; RELAXATION AB The H-1 and C-13 nuclear magnetic resonance (NMR) of thin diamond films deposited from naturally abundant (1.1 at. %) as well as 50% and 100% C-13-enriched CH4 heavily diluted in H-2 is described and discussed. Less than 0.6 at. % of hydrogen is found in the films which contain crystallites up to approximately 15 mum across. The H-1 NMR consists of a broad 50-65-kHz-wide Gaussian line attributed to H atoms bonded to carbon and covering the crystallite surfaces. A narrow Lorentzian line was only occasionally observed and is found not to be intrinsic to the diamond structure. The C-13 NMR demonstrates that >99.5% of the C atoms reside in a quaternary diamondlike configuration. H-1-C-13 cross-polarization measurement indicates that, at the very least, the majority of C-13 nuclei cross polarized by H-1, i.e., within three bond distances from a H-1 at a crystallite surface, reside in sp3 diamondlike coordinated sites. The C-13 relaxation rates of the films are four orders of magnitude faster than that of natural diamond and believed to be due to C-13 spin diffusion to paramagnetic centers, presumably carbon dangling bonds. Analysis of the measured relaxation rates indicates that within the C-13 spin-diffusion length of square-root/DT1c approximately 0.05 mum, these centers are uniformly distributed in the diamond crystallites. The possibility that the dangling bonds are located at internal nanovoid surfaces is discussed. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP PRUSKI, M (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 36 TC 18 Z9 18 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 APR 15 PY 1994 VL 49 IS 15 BP 10635 EP 10642 DI 10.1103/PhysRevB.49.10635 PG 8 WC Physics, Condensed Matter SC Physics GA NJ756 UT WOS:A1994NJ75600068 ER PT J AU LIECHTENSTEIN, AI ANTROPOV, VP HARMON, BN AF LIECHTENSTEIN, AI ANTROPOV, VP HARMON, BN TI ELECTRONIC-STRUCTURE AND MAGNETOOPTICAL EFFECTS IN CESB SO PHYSICAL REVIEW B LA English DT Note ID ORBITAL POLARIZATION; BAND; LANTHANIDES; SYSTEMS; METALS; MODEL AB The electronic structure and magneto-optical spectra of CeSb have been calculated using the self-consistent local-density approximation with explicit on-site Coulomb parameters for the correlated f state of cerium. The essential electronic structure of cerium antimonide consists of one occupied f band, predominantly with orbital m = -3 character and spin sigma = 1 located 2 eV below the Fermi level and interacting with broad Sb p bands crossing E(F). The m-dependent p-f hybridization leads to large magnetic anisotropy and magneto-optical spectra in better agreement with experiment than obtained with the standard local-spin-density approximation. C1 IOWA STATE UNIV SCI & TECHNOL, US DOE, AMES LAB, AMES, IA 50011 USA. RI Lichtenstein, Alexander/K-8730-2012 OI Lichtenstein, Alexander/0000-0003-0152-7122 NR 34 TC 42 Z9 42 U1 2 U2 5 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD APR 15 PY 1994 VL 49 IS 15 BP 10770 EP 10773 DI 10.1103/PhysRevB.49.10770 PG 4 WC Physics, Condensed Matter SC Physics GA NJ756 UT WOS:A1994NJ75600090 ER PT J AU SLUITER, MHF SINGH, PP AF SLUITER, MHF SINGH, PP TI TRANSFERABLE TIGHT-BINDING PARAMETERS - AN APPLICATION TO NI AND NI-AL ALLOYS SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE AB The first-principles transformation of the linear muffin-tin orbitals (LMTO) into a tight-binding (TB) basis provides a reliable and very efficient method of obtaining the so-called Slater-Koster (SK) parameters, which can be used to gain insight into the electronic structure of complex systems, where conventional ab initio methods become too computer intensive. In this work we study the usefulness and the reliability of the SK parameters obtained from the TB-LMTO method, by examining their (i) transferability with changes in structural and chemical environments and (ii) applicability over a wide range of interatomic separations through explicit charge self-consistent LMTO calculations using Ni and Ni-Al systems as examples. We further test these parameters by comparing the densities of states and the effective pair interactions of Ni-Al system with the results of the more accurate Korringa-Kohn-Rostoker-coherent potential approximation method. We also compare our results with the SK parameters obtained empirically. RP SLUITER, MHF (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,POB 808,LIVERMORE,CA 94550, USA. RI Sluiter, Marcel/E-6086-2010 OI Sluiter, Marcel/0000-0002-6514-4318 NR 11 TC 21 Z9 21 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 APR 15 PY 1994 VL 49 IS 16 BP 10918 EP 10925 DI 10.1103/PhysRevB.49.10918 PG 8 WC Physics, Condensed Matter SC Physics GA NK063 UT WOS:A1994NK06300009 ER PT J AU HAGLER, TW PAKBAZ, K HEEGER, AJ AF HAGLER, TW PAKBAZ, K HEEGER, AJ TI POLARIZED-ELECTROABSORPTION SPECTROSCOPY OF A SOLUBLE DERIVATIVE OF POLY(P-PHENYLENEVINYLENE) ORIENTED BY GEL PROCESSING IN POLYETHYLENE - POLARIZATION ANISOTROPY, THE OFF-AXIS DIPOLE-MOMENT, AND EXCITED-STATE DELOCALIZATION SO PHYSICAL REVIEW B LA English DT Article ID CONJUGATED POLYMERS; BAND DESCRIPTION; POLYACETYLENE; ORIENTATION; ABSORPTION; VINYLENE); ORDER; LUMINESCENCE; EXCITATION; MOLECULES AB We present the polarized electric field modulation spectra of dilute blends of the conjugated polymer poly[2-methoxy,5-(2'-ethyl-hexoxy)-p-phenylenevinylene] (MEH-PPV) oriented in ultrahigh-molecular-weight polyethylene (PE). The photoluminescence and electric-field-modulation spectra of tensile drawn MEH-PPV/PE blends are highly anisotropic, with preferred polarization parallel to the draw axis; the field-induced absorption and photoluminescence demonstrate polarization anisotropies in excess of 150:1 and 60:1, respectively. Because of the orientation, the enhanced order, and the dilution of the MEH-PPV conjugated polymer in the polyethylene matrix, the MEH-PPV/PE blend is an ideal system in which to investigate the intrinsic linear and nonlinear optical properties of oriented conjugated polymer chains. The absorption is directly proportional to the imaginary part of chi(1)(omega), and the electroabsorption is directly proportional to the imaginary part of chi(3) (omega, 0, 0) of the ordered MEH-PPV pi-electron system. The optical data obtained from the oriented blends are therefore directly relevant to existing theoretical models which do not account for disorder. Using a model for the off-axis transition dipole moment of the conjugated polymer, which is based on the measured off-axis transition dipole moment of trans-stilbene and the geometric structure of MEH-PPV, we demonstrate that the observed anisotropy of 150:1 in the field-induced absorption requires that the instantaneous excited-state wave functions are delocalized over a minimum of 50 unit cells (400 angstrom). C1 UNIV CALIF SANTA BARBARA, DEPT PHYS, SANTA BARBARA, CA 93106 USA. UNIV CALIF SANTA BARBARA, INST POLYMERS & ORGAN SOLIDS, SANTA BARBARA, CA 93106 USA. RP HAGLER, TW (reprint author), LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 35 TC 99 Z9 99 U1 1 U2 15 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD APR 15 PY 1994 VL 49 IS 16 BP 10968 EP 10975 DI 10.1103/PhysRevB.49.10968 PG 8 WC Physics, Condensed Matter SC Physics GA NK063 UT WOS:A1994NK06300013 ER PT J AU SIGALAS, MM SOUKOULIS, CM CHAN, CT HO, KM AF SIGALAS, MM SOUKOULIS, CM CHAN, CT HO, KM TI ELECTROMAGNETIC-WAVE PROPAGATION THROUGH DISPERSIVE AND ABSORPTIVE PHOTONIC-BAND-GAP MATERIALS SO PHYSICAL REVIEW B LA English DT Article ID PERIODIC DIELECTRIC STRUCTURES; 2-DIMENSIONAL SQUARE; LATTICES; EXISTENCE AB Using the transfer-matrix method, we calculate the transmission coefficient versus the frequency of the incident electromagnetic waves propagating in photonic-band-gap structures constructed from dispersive and highly absorbing materials. We study how the photonic band gaps are affected by the presence of polariton gaps and/or absorption. Also, the possible difficulties of their experimental investigation are discussed. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP SIGALAS, MM (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. RI Soukoulis, Costas/A-5295-2008 NR 22 TC 113 Z9 115 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 APR 15 PY 1994 VL 49 IS 16 BP 11080 EP 11087 DI 10.1103/PhysRevB.49.11080 PG 8 WC Physics, Condensed Matter SC Physics GA NK063 UT WOS:A1994NK06300029 ER PT J AU JAFFE, JE HARRISON, NM HESS, AC AF JAFFE, JE HARRISON, NM HESS, AC TI AB-INITIO STUDY OF ZNO (101(BAR)0) SURFACE RELAXATION SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; CLEAVAGE FACES; TOTAL-ENERGY; DIFFRACTION; SOLIDS; CDSE AB Periodic Hartree-Fock total-energy calculations on two-dimensional slabs have been used to study the symmetry-conserving relaxation of the nonpolar (1010BAR) surface of ZnO. We find that it is energetically favorable for the Zn-O surface dimers to tilt slightly (by 2.3-degrees) and move downwards towards the slab, and for the dimer bond to shorten significantly. Our results agree fairly well with those of a recent density-functional calculation, but disagree with empirical tight-binding theory which predicts surface bonds to shorten only slightly while the surface dimers undergo a large tilt (18-degrees). The available experimental data lies between the ab initio and tight-binding results with large error bars. We have tested the effects of several refinements of our Hartree-Fock calculation, including improvements of the orbital basis set and precision tolerances, the use of thicker slabs in approximating the semi-infinite crystal, and post-self-consistent-field density-functional correlation corrections to the total energy. None of these refinements significantly changed our results. We discuss possible reasons for the disagreement between our results and those of tight-binding theory. C1 SERC, DARESBURY LAB, WARRINGTON WA4 4AD, CHESHIRE, ENGLAND. RP JAFFE, JE (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RI Harrison, Nicholas/H-3198-2013 OI Harrison, Nicholas/0000-0001-7498-8144 NR 24 TC 82 Z9 82 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 APR 15 PY 1994 VL 49 IS 16 BP 11153 EP 11158 DI 10.1103/PhysRevB.49.11153 PG 6 WC Physics, Condensed Matter SC Physics GA NK063 UT WOS:A1994NK06300038 ER PT J AU ARENT, DJ ALONSO, RG HORNER, GS LEVI, D BODE, M MASCARENHAS, A OLSON, JM YIN, X DELONG, MC SPRINGTHORPE, AJ MAJEED, A MOWBRAY, DJ SKOLNICK, MS AF ARENT, DJ ALONSO, RG HORNER, GS LEVI, D BODE, M MASCARENHAS, A OLSON, JM YIN, X DELONG, MC SPRINGTHORPE, AJ MAJEED, A MOWBRAY, DJ SKOLNICK, MS TI OPTICAL-PROPERTIES OF ORDERED AND RANDOMLY DISORDERED ALAS/GAAS SHORT-PERIOD SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Article ID PHOTOLUMINESCENT PROPERTIES; LOCALIZATION; SPECTROSCOPY; ABSORPTION; LIFETIME; EPITAXY AB The optical properties of different atomic arrangements of Al0.5Ga0.5As, deposited by molecular-beam epitaxy and having nominally identical average composition, have been compared. Markedly different signatures are seen in steady-state, time-resolved, and microwave-modulated photoluminescence, photoreflectance, and photoluminescence-excitation spectroscopies for a random pseudobinary alloy and (AlAs)n(GaAs)4-n superlattices where n = 2 (ordered) or n is randomly chosen (disordered) from the sets [1,2,3] or [0,1,2,3,4]. When n=[0, 1, 2, 3, or 4] the optical properties are dominated by quantum confinement effects due to the presence of layers with thicknesses up to 14 monolayers. When n = [1, 2, or 3] the optical properties are consistently described by the presence of disorder-induced localized states and a hopping-assisted recombination mechanism. C1 UNIV UTAH,DEPT PHYS,SALT LAKE CITY,UT 84112. BELL NO RES LTD,OTTAWA K1Y 4H7,ONTARIO,CANADA. UNIV SHEFFIELD,DEPT PHYS,SHEFFIELD S3 7RH,S YORKSHIRE,ENGLAND. RP ARENT, DJ (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. RI Skolnick, Maurice/G-7250-2016 OI Skolnick, Maurice/0000-0002-3972-8344 NR 38 TC 19 Z9 19 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 APR 15 PY 1994 VL 49 IS 16 BP 11173 EP 11184 DI 10.1103/PhysRevB.49.11173 PG 12 WC Physics, Condensed Matter SC Physics GA NK063 UT WOS:A1994NK06300041 ER PT J AU LUO, XC AF LUO, XC TI STATISTICAL TESTS FOR THE GAUSSIAN NATURE OF PRIMORDIAL FLUCTUATIONS THROUGH CBR EXPERIMENTS SO PHYSICAL REVIEW D LA English DT Article ID DIFFERENTIAL MICROWAVE RADIOMETER; INFLATIONARY UNIVERSE SCENARIO; BACKGROUND-RADIATION; DENSITY PERTURBATIONS; DOMAIN-WALLS; ANISOTROPY; COSMOLOGY; SYMMETRY; TOPOLOGY; STRINGS AB Information about the physical processes that generate the primordial fluctuations in the early Universe can be gained by testing the Gaussian nature of the fluctuations through cosmic microwave background radiation (CBR) temperature anisotropy experiments. One of the crucial aspects of density perturbations that are produced by the standard inflation scenario is that they are Gaussian, whereas seeds produced by topological defects left over from an early cosmic phase transition tend to be non-Gaussian. To carry out this test, sophisticated statistical tools are required. In this paper, we will discuss several such statistical tools, including multivariant skewness and kurtosis, Euler-Poincare characteristics, the three-point temperature correlation function, and Hotelling's T2 statistic defined through bispectral estimates of a one-dimensional data set. The effect of noise present in the current data is discussed in detail and the COBE 53 GHz data set is analyzed. Our analysis shows that, on the large angular scale to which COBE is sensitive, the statistics are probably Gaussian. On the small angular scales, the importance of Hotelling's T2 statistic is stressed, and the minimum sample size required to test Gaussianity is estimated. Although the current data set available from various experiments at half-degree scales is still too small, improvement of the data set by roughly a factor of 2 will be enough to test the Gaussianity statistically. On the arc min scale, we analyze the recent RING data through bispectral analysis, and the result indicates possible deviation from Gaussianity. Effects of point sources are also discussed. It is pointed out that the Gaussianity problem can be resolved in the near future by ground-based or balloon-borne experiments. C1 UNIV CHICAGO,ENRICO FERMI INST,DEPT PHYS,CHICAGO,IL 60637. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. NR 90 TC 27 Z9 27 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 APR 15 PY 1994 VL 49 IS 8 BP 3810 EP 3829 DI 10.1103/PhysRevD.49.3810 PG 20 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NJ177 UT WOS:A1994NJ17700002 ER PT J AU HU, Y TURNER, MS WEINBERG, EJ AF HU, Y TURNER, MS WEINBERG, EJ TI DYNAMICAL SOLUTIONS TO THE HORIZON AND FLATNESS PROBLEMS SO PHYSICAL REVIEW D LA English DT Article ID COSMOLOGICAL MODELS; EARLY UNIVERSE; INFLATION; SINGULARITY AB We discuss in some detail the requirements on an early-Universe model that solves the horizon and flatness problems during the epoch of classical cosmology (t greater-than-or-equal-to t(i) >> 10(-43) sec). We show that a dynamical resolution of the horizon problem requires superluminal expansion (or very close to it) and that a truly satisfactory resolution of the flatness problem requires entropy production. This implies that a proposed class of adiabatic models in which the Planck mass varies by many orders of magnitude cannot fully resolve the flatness problem. Furthermore, we show that, subject to minimal assumptions, such models cannot solve the horizon problem either. Because superluminal expansion and entropy production are the two generic features of inflationary models, our results suggest that inflation, or something very similar, may be the only dynamical solution to the horizon and flatness problems. C1 UNIV CHICAGO,ENRICO FERMI INST,DEPT PHYS,CHICAGO,IL 60637. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. RP HU, Y (reprint author), COLUMBIA UNIV,DEPT PHYS,NEW YORK,NY 10027, USA. NR 20 TC 33 Z9 33 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD APR 15 PY 1994 VL 49 IS 8 BP 3830 EP 3836 DI 10.1103/PhysRevD.49.3830 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NJ177 UT WOS:A1994NJ17700003 ER PT J AU JUNGNICKEL, DU WALLISER, D AF JUNGNICKEL, DU WALLISER, D TI INHOMOGENEOUS FIELD CONFIGURATIONS AND THE ELECTROWEAK PHASE-TRANSITION SO PHYSICAL REVIEW D LA English DT Article ID HOT GAUGE-THEORIES; FINITE TEMPERATURE; CURVED SPACETIME; SYMMETRY BEHAVIOR; FALSE VACUUM; AMPLITUDES; PROPAGATOR; EXPANSION; PARTICLES; MODEL AB We investigate the effects of inhomogeneous scalar field configurations on the electroweak phase transition. For this purpose we calculate the leading perturbative correction to the wave function correction term Z(phi, T), i.e., the kinetic term in the effective action, for the electroweak standard model at finite temperature and the top quark self-mass. Our finding for the fermionic contribution to Z(phi, T) is infrared finite and disagrees with other recent results. In general, neither the order of the phase transition nor the temperature at which it occurs change, once Z(phi, T) is included. But a nonvanishing, positive (negative) Z(phi, T) enhances (decreases) the critical droplet surface tension and the strength of the phase transition. We find that in the range of parameter space which allows for a first-order phase transition the wave function correction term is negative, indicating a weaker phase transition, and especially for small field values so large that perturbation theory becomes unreliable. C1 FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. RP JUNGNICKEL, DU (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 69 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 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD APR 15 PY 1994 VL 49 IS 8 BP 3869 EP 3880 DI 10.1103/PhysRevD.49.3869 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NJ177 UT WOS:A1994NJ17700008 ER PT J AU ANTARAMIAN, A HALL, LJ RASIN, A AF ANTARAMIAN, A HALL, LJ RASIN, A TI HYPERCHARGE AND THE COSMOLOGICAL BARYON ASYMMETRY SO PHYSICAL REVIEW D LA English DT Article ID WEINBERG-SALAM THEORY; R-PARITY BREAKING; COLD DARK MATTER; SUPERSYMMETRIC MODELS; NUMBER VIOLATION; NEUTRINO MASSES; STANDARD MODEL; LEPTON NUMBER; BARYOGENESIS; CONSTRAINTS AB Stringent bounds on baryon- and lepton-number-violating interactions have been derived from the requirement that such interactions, together with electroweak instantons, do not destroy a cosmological baryon asymmetry produced at an extremely high temperature in the big bang. While these bounds apply in specific models, we find that they are generically avoided. In particular, the only requirement for a theory to avoid these bounds is that it contain charge particles which, during a certain cosmological epoch, carry a nonzero hypercharge asymmetry. Hypercharge neutrality of the Universe then dictates that the remaining particles must carry a compensating hypercharge density, which is necessarily shared among them so as to give a baryon asymmetry. Hence the generation of a hypercharge density in a sector of the theory forces the Universe to have a baryon asymmetry. RP ANTARAMIAN, A (reprint author), LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720, USA. NR 36 TC 12 Z9 12 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD APR 15 PY 1994 VL 49 IS 8 BP 3881 EP 3885 DI 10.1103/PhysRevD.49.3881 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NJ177 UT WOS:A1994NJ17700009 ER PT J AU JAFFE, AH AF JAFFE, AH TI QUASI-LINEAR EVOLUTION OF COMPENSATED COSMOLOGICAL PERTURBATIONS - THE NONLINEAR-SIGMA-MODEL SO PHYSICAL REVIEW D LA English DT Article ID LARGE-SCALE STRUCTURE AB We consider the evolution of perturbations to a flat FRW universe that arise from a ''stiff source,'' such as a self-ordering cosmic field that forms in a global symmetry-breaking phase transition and evolves via the Kibble mechanism. Although the linear response of the normal matter to the source depends on the details of the source dynamics, we show that the higher-order nonlinear perturbative equations reduce to a form identical to those of source-free Newtonian gravity in the small wavelength limit. Consequently, the resulting n-point correlation functions and their spectral counterparts will have a hierarchical contribution arising from this gravitational evolution (as in the source-free case) in addition to that possibly coming from non-Gaussian initial conditions. We apply this formalism to the O(N) nonlinear sigma model at large N and find that observable differences from the case of initially Gaussian perturbations and Newtonian gravity in the bispectrum and higher-order correlations are not expected on scales smaller than about 100h-1 Mpc. C1 FERMILAB NATL ACCELERATOR LAB, NASA, FERMILAB ASTROPHYS CTR, BATAVIA, IL 60510 USA. DEPT ASTRON & ASTROPHYS, CHICAGO, IL 60637 USA. RP JAFFE, AH (reprint author), ENRICO FERMI INST, 5640 S ELLIS AVE, CHICAGO, IL 60637 USA. RI Jaffe, Andrew/D-3526-2009 NR 38 TC 27 Z9 27 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1550-7998 J9 PHYS REV D JI Phys. Rev. D PD APR 15 PY 1994 VL 49 IS 8 BP 3893 EP 3909 DI 10.1103/PhysRevD.49.3893 PG 17 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NJ177 UT WOS:A1994NJ17700011 ER PT J AU HENDERSON, CC ROHLFING, CM GILLEN, KT CAHILL, PA AF HENDERSON, CC ROHLFING, CM GILLEN, KT CAHILL, PA TI SYNTHESIS, ISOLATION, AND EQUILIBRATION OF 1,9-C70H2 AND 7,8-C70H2 SO SCIENCE LA English DT Article AB Equilibration of 1,9- and 7,8-C70H2 has allowed the relative free energy of these isomers to be measured. These ''simplest hydrocarbon derivatives of C70'' are formed by hydroboration of C70 at room temperature. Analysis of the platinum-catalyzed equilibration of these isomers yielded a relative free energy at 295 kelvin of 1.4 +/- 0.2 kilocalories per mole, with the 1,9 isomer being more stable. This value is in excellent agreement with the ab initio HF/6-31G* calculated energy difference of 1.3 kilocalories per mole, whereas semiempirical calculations gave poor agreement. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 15 TC 106 Z9 107 U1 1 U2 7 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD APR 15 PY 1994 VL 264 IS 5157 BP 397 EP 399 DI 10.1126/science.264.5157.397 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NG194 UT WOS:A1994NG19400030 PM 17836900 ER PT J AU WANG, ZR WANG, XL FERNANDEZBACA, JA JOHNSTON, DC VAKNIN, D AF WANG, ZR WANG, XL FERNANDEZBACA, JA JOHNSTON, DC VAKNIN, D TI ANTIFERROMAGNETIC ORDERING AND PARAMAGNETIC BEHAVIOR OF FERROMAGNETIC CU6 AND CU18 CLUSTERS IN BACUO2+X SO SCIENCE LA English DT Article ID STATE AB Magnetization and neutron diffraction measurements on polycrystalline BaCuO2+x revealed a combination of magnetic behaviors. The Cu6 ring clusters and Cu18 sphere clusters in this compound had ferromagnetic ground states with large spins 3 and 9, respectively. The Cu6 rings ordered antiferromagnetically below the Neel temperature T(N) = 15 +/- 0.5 kelvin, whereas the Cu18 spheres remained paramagnetic down to 2 kelvin. The ordered moment below T(N) was 0.89(5) Bohr magnetons per Cu in the Cu6 rings, demonstrating that quantum fluctuation effects are small in these atomic clusters. The Cu18 clusters are predicted to exhibit ferromagnetic intercluster order below about 1 kelvin. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RI Wang, Xun-Li/C-9636-2010; Fernandez-Baca, Jaime/C-3984-2014; Vaknin, David/B-3302-2009 OI Wang, Xun-Li/0000-0003-4060-8777; Fernandez-Baca, Jaime/0000-0001-9080-5096; Vaknin, David/0000-0002-0899-9248 NR 16 TC 11 Z9 11 U1 0 U2 8 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD APR 15 PY 1994 VL 264 IS 5157 BP 402 EP 404 DI 10.1126/science.264.5157.402 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NG194 UT WOS:A1994NG19400032 PM 17836901 ER PT J AU SCHNEIBEL, JH AF SCHNEIBEL, JH TI SOLID-SOLUTION LIMITS AND SELECTED MECHANICAL-PROPERTIES OF THE QUATERNARY L1(2) TRIALUMINIDE AL-TI-MN-MO SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID L12 TRIALUMINIDES; CUBIC PHASES; OXIDATION BEHAVIOR; ALLOYING AL3TI; FRACTURE; CR; MICROSTRUCTURE; DEFORMATION; TITANIUM; COMPRESSION RP SCHNEIBEL, JH (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 28 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 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD APR 15 PY 1994 VL 30 IS 8 BP 997 EP 1002 DI 10.1016/0956-716X(94)90544-4 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA MW192 UT WOS:A1994MW19200007 ER PT J AU FASCHING, AA EDWARDS, GR DAVID, SA AF FASCHING, AA EDWARDS, GR DAVID, SA TI GRAIN-GROWTH KINETICS OF AN IRON ALUMINIDE ALLOY SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP FASCHING, AA (reprint author), COLORADO SCH MINES,CTR WELDING & JOINING RES,GOLDEN,CO 80401, USA. NR 8 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 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD APR 15 PY 1994 VL 30 IS 8 BP 1003 EP 1008 DI 10.1016/0956-716X(94)90545-2 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA MW192 UT WOS:A1994MW19200008 ER PT J AU WANG, JY VAKNIN, D UPHAUS, RA KJAER, K LOSCHE, M AF WANG, JY VAKNIN, D UPHAUS, RA KJAER, K LOSCHE, M TI FULLERENE FILMS AND FULLERENE DODECYLAMINE ADDUCT MONOLAYERS AT AIR-WATER INTERFACES STUDIED BY NEUTRON AND X-RAY REFLECTION SO THIN SOLID FILMS LA English DT Article ID LANGMUIR-BLODGETT-FILMS; C-60; C60 AB Neutron and X-ray reflection measurements and surface pressure isotherms of spread films of the fullerene-dodecylamine adduct C60-[NH2(CH2)11CH3]x all indicate that this material may form monomolecular layers on water surfaces. The reflection data sets (neutron on both H2O and D2O) can be accounted for by a single model structure defined in terms of the dimensions of an average cell and its chemical composition. This model ascribes a total thickness of about 29 angstrom to the molecular interface layer with the following internal structure. The fullerenes (with several alkyl chains attached) form a central stratum and the remainder alkyl tails are located close to both the air and the water interfaces. The alkyl moieties close to the aqueous substrate are hydrated. The reflection experiments and the isotherms suggest that on average 8 +/- 3 dodecylamine molecules are present per fullerene, consistent within error, with elemental analysis 5 +/- 2. By contrast, neutron reflection and surface pressure vs. area data of spread films of C60 fullerenes on aqueous surfaces indicate the formation of inhomogeneous multilayer films with a thickness and a surface roughness exceeding the molecular size. These underivatized fullerenes thus do not form monomolecular films. C1 ISU,USDOE,AMES LAB,DEPT CHEM,AMES,IA 50011. RISO NATL LAB,DEPT PHYS,DK-4000 ROSKILDE,DENMARK. JOHANNES GUTENBERG UNIV,INST PHYS CHEM,D-55099 MAINZ,GERMANY. ISU,USDOE,AMES LAB,DEPT PHYS,AMES,IA 50011. RI Losche, Mathias/J-2986-2013; Vaknin, David/B-3302-2009 OI Losche, Mathias/0000-0001-6666-916X; Vaknin, David/0000-0002-0899-9248 NR 23 TC 31 Z9 31 U1 0 U2 5 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 APR 15 PY 1994 VL 242 IS 1-2 BP 40 EP 44 DI 10.1016/0040-6090(94)90498-7 PG 5 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA NJ668 UT WOS:A1994NJ66800009 ER PT J AU ECKHARDT, CJ PEACHEY, NM TAKACS, JM UPHAUS, RA AF ECKHARDT, CJ PEACHEY, NM TAKACS, JM UPHAUS, RA TI CRYSTAL ENGINEERING IN 2 DIMENSIONS - CONTROL OF PLANAR PACKING BY DESIGN OF NEW AMPHIPHILES SO THIN SOLID FILMS LA English DT Article ID LANGMUIR-BLODGETT-FILMS; X-RAY-DIFFRACTION; MONOLAYER; SURFACE; WATER; PHASES; ACID AB Monolayers on mica of two rigid amphiphiles of specific cross-sectional geometry have been studied by atomic force microscopy and are ordered over micron scale areas. An interlocking amphiphile shows disruption into crystalline shards on transfer from the aqueous subphase. A chiral amphiphile retains its integrity when transferred from the intermediate pressure phase but exhibits catastrophic changes when transferred from the high pressure phase. The results imply that the interlocked amphiphile has the same structure for both aqueous and solid subphases. The phases exhibited by the chiral amphiphile on mica are probably not those observed on the aqueous subphase. C1 UNIV NEBRASKA,DEPT CHEM,LINCOLN,NE 68588. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 21 TC 5 Z9 5 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD APR 15 PY 1994 VL 242 IS 1-2 BP 67 EP 73 DI 10.1016/0040-6090(94)90503-7 PG 7 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA NJ668 UT WOS:A1994NJ66800014 ER PT J AU LOSCHE, M ERDELEN, C RUMP, E RINGSDORF, H KJAER, K VAKNIN, D AF LOSCHE, M ERDELEN, C RUMP, E RINGSDORF, H KJAER, K VAKNIN, D TI ON THE LIPID HEAD GROUP HYDRATION OF FLOATING SURFACE MONOLAYERS BOUND TO SELF-ASSEMBLED MOLECULAR PROTEIN LAYERS SO THIN SOLID FILMS LA English DT Article AB The structure of monomolecular layers of the protein streptavidin, specifically bound to biotin-functionalized lipid monolayers at aqueous surfaces, has been characterized. Neutron and X-ray reflectivity measurements allowed an assessment of the organization of these self-assembled systems with molecular resolution. Emphasis here is placed on the hydration of the lipid head groups in the bound state. For three functionalized lipids with spacers of different lengths between the biotin and their chains it was observed that the head groups were dehydrated in monolayers of the pure lipids, which were kept at low surface pressure before protein adsorption. The introduction of dipole moments at the interface by the admixture of phospholipids or the application of lateral pressure on the lipid monolayer before protein adsorption were found to impose an extension of the spacer moieties. The biotin groups were thus presented further away from the interface, and a hydration layer between the protein and the functionalized interface was observed in the self-assembled supramolecular structures. C1 JOHANNES GUTENBERG UNIV MAINZ,INST ORGAN CHEM,D-55099 MAINZ,GERMANY. RISO NATL LAB,DEPT PHYS,DK-4000 ROSKILDE,DENMARK. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,DEPT PHYS,AMES,IA 50011. RP LOSCHE, M (reprint author), JOHANNES GUTENBERG UNIV MAINZ,INST PHYS CHEM,D-55099 MAINZ,GERMANY. RI Losche, Mathias/J-2986-2013; Vaknin, David/B-3302-2009 OI Losche, Mathias/0000-0001-6666-916X; Vaknin, David/0000-0002-0899-9248 NR 0 TC 5 Z9 6 U1 0 U2 3 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 APR 15 PY 1994 VL 242 IS 1-2 BP 112 EP 117 DI 10.1016/0040-6090(94)90512-6 PG 6 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA NJ668 UT WOS:A1994NJ66800023 ER PT J AU WANG, JY UPHAUS, RA AMEENUDDIN, S RINTOUL, DA AF WANG, JY UPHAUS, RA AMEENUDDIN, S RINTOUL, DA TI FORMATION OF NANOSCALE SIZE CADMIUM-SULFIDE WITHIN A CHANNEL PROTEIN MONOLAYER SO THIN SOLID FILMS LA English DT Article ID SEMICONDUCTOR PARTICULATE FILMS; QUANTIZATION; PARTICLES; CLUSTERS; INTERFACES; SURFACES; INSITU; CDS AB The size, structure and ease of manipulation of organized monolayer structures have been used to control reaction pathways for the formation of semiconductor particle clusters of cadmium sulfide and other semiconductors. The size and particle distributions are determined by the specific monolayer structure chosen. The present study reports a new technique for the formation of small clusters of cadmium and zinc sulfides. It combines monolayer methods with techniques based on inclusion formation in restricted volumes. Cadmium and zinc sulfides are formed within the cavity of a channel protein by a simple process in which a close-packed monolayer of the channel protein is formed on a neutral subphase, transported to a cadmium-chloride-containing subphase, transferred to a slide by Langmuir-Blodgett transfer and exposed to hydrogen sulfide. The channel protein is a membrane-bound entity with hydrophobic exterior walls and a hydrophilic inside channel (12 angstrom diameter). It is cylindrical and in compressed monolayers is oriented normal to the interface with the channel mouth in communication with the subphase. Small water-soluble ions are rapidly taken into the channel interior. The size of the cluster formed is limited by the small number of ions capable of assimilation into the channel and, because each group of ions is compartmentalized, there is no possibility of spontaneous aggregation to produce macroscopic particulate inside of the protein channel. The cadmium and zinc sulfides were produced in the ''quantum dot'' size range as evidenced by their markedly blue-shifted optical spectra. The results of this study indicate more general potential application of channel protein structures as nanoscale reactors, in the case of the protein used here the channel opening and closing can be modulated by pH changes, affording the possibility of sealing or encapsulating reactants or products in small defined volumes. Other types of channel structure are closed by changes in potential, specific small ions or biogenic messenger molecules. Some of these have significantly larger channel volumes that the protein used here. These too may be likely future systems for specific small-scale reactions. C1 KANSAS STATE UNIV AGR & APPL SCI,DEPT BIOL,MANHATTAN,KS 66506. RP WANG, JY (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 21 TC 10 Z9 14 U1 0 U2 3 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 APR 15 PY 1994 VL 242 IS 1-2 BP 127 EP 131 DI 10.1016/0040-6090(94)90515-0 PG 5 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA NJ668 UT WOS:A1994NJ66800026 ER PT J AU WANG, JY UPHAUS, RA WANG, J JAEGER, DA AF WANG, JY UPHAUS, RA WANG, J JAEGER, DA TI MONOLAYER STUDY OF CLEAVABLE PHOSPHOLIPIDS SO THIN SOLID FILMS LA English DT Article ID CHAIN-SUBSTITUTED LIPIDS; MOLECULAR PACKING; SURFACTANTS; FILMS AB Monolayer characteristics were determined for three isomeric cleavable phospholipids containing a ketal group on one of the alkyl chains: 1-octadecanoyl-2-[trans-[8-(2,2-dimethyl-5-octyl-1,3-dioxolan-4-yl)octanoyl]]-sn-glycero-3-phosphatidylcholine (1a); I-octadecanoyl-2-[16-(2,2-dimethyl-1,3-dioxolan-4-yl)hexadecanoyl]-sn-glycero-3-phosphatidylcholine(1b); and 1-octadecanoyl-2-[trans-[1-(2,2-dimethyl-5-pentadecyl-1,3-dixolan-4-yl)methanoyl]]-sn-glycero-3-phosphatidylcholine (1c). The monolayer characteristics were also determined for two of the daughter surfactants in which a vic-diol group replaces the ketal group: 1-octadecanoyl-2-(threo-9,10-dihydroxyloctadecanoyl)-sn-glycero-3-phosphatidylcholine (2a) and 1-octadecanoyl-2-(17,18-dihydroxyoctadecanoyl)-sn-glycero-3-phosphatidylcholine (2b). Surfactants 1a-c displayed surprisingly high solubility in the water subphase; stable monolayers could not be formed even at 7-8-degrees-C. Reproducible surface pressure isotherms were obtained for 1a-c, 2a and 2b using a subphase of aqueous 30% polyethylene glycol. The apparent areas/molecule were larger than expected based on estimates from CPK models, even assuming that all alkyl chains are flat on the interface and are never elevated above it to any appreciable degree, even at high compressions. Surface potential measurements generally remained constant throughout the range of compression. The disparities between measured and estimated molecular areas are probably due to two effects: chirality in the systems and occlusion of void areas present in many of the planar conformational states. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. UNIV WYOMING,DEPT CHEM,LARAMIE,WY 82071. RP WANG, JY (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 9 TC 2 Z9 2 U1 1 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD APR 15 PY 1994 VL 242 IS 1-2 BP 277 EP 282 DI 10.1016/0040-6090(94)90545-2 PG 6 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA NJ668 UT WOS:A1994NJ66800056 ER PT J AU FRELIER, PF ELSTON, RA LOY, JK MINCHER, C AF FRELIER, PF ELSTON, RA LOY, JK MINCHER, C TI MACROSCOPIC AND MICROSCOPIC FEATURES OF ULCERATIVE STOMATITIS IN FARMED ATLANTIC SALMON SALMO-SALAR SO DISEASES OF AQUATIC ORGANISMS LA English DT Note DE ATLANTIC SALMON; SALMO-SALAR; BACTERIAL DISEASE; STOMATITIS; CYTOPHAGA-LIKE; FLEXIBACTER-LIKE ID FLEXIBACTER-MARITIMUS; MARINE FISHES; SP-NOV; JAPAN AB Ulcerative stomatitis is an economically important disease of salmon smolts in net-pen farms of Puget Sound, Washington, USA. Gross lesions and losses from this disease typically occur 3 to 8 wk following introduction to sea water and may result in a cumulative mortality of up to 30% in some pens. The disease occurs seasonally and has been present on one farm since it began production in 1987. Ulcerated lesions are limited to the oral cavity, vary in size, and are associated with areas of dentition. Mats of Cytophaga-like filamentous bacteria are associated with areas of ulceration and necrosis and often extend into the underlying bone. Scanning electron microscopy demonstrated mats of filamentous bacteria overlying ulcerated areas and biofilms of filamentous bacteria adhering to tooth surfaces at the gingival-enameloid interface and invading the gingival epithelium. Our findings suggest the filamentous bacterium plays a major role in the pathogenesis of ulcerative stomatitis in salmon smolts. C1 BATTELLE MARINE RES LAB,SEQUIM,WA 98382. RP FRELIER, PF (reprint author), TEXAS A&M UNIV,COLL VET MED,DEPT VET PATHOBIOL,COLLEGE STN,TX 77843, USA. NR 16 TC 6 Z9 6 U1 0 U2 1 PU INTER-RESEARCH PI OLDENDORF LUHE PA NORDBUNTE 23, D-21385 OLDENDORF LUHE, GERMANY SN 0177-5103 J9 DIS AQUAT ORGAN JI Dis. Aquat. Org. PD APR 14 PY 1994 VL 18 IS 3 BP 227 EP 231 DI 10.3354/dao018227 PG 5 WC Fisheries; Veterinary Sciences SC Fisheries; Veterinary Sciences GA NP333 UT WOS:A1994NP33300012 ER PT J AU WANG, CA CHOI, HK WALPOLE, JN EVANS, GA REICHERT, WF CHOW, WW FULLER, CT AF WANG, CA CHOI, HK WALPOLE, JN EVANS, GA REICHERT, WF CHOW, WW FULLER, CT TI HIGH-POWER, HIGH-TEMPERATURE INGAAS-ALGAAS STRAINED-LAYER QUANTUM-WELL DIODE-LASERS SO ELECTRONICS LETTERS LA English DT Article DE SEMICONDUCTOR LASERS; LASERS ID THRESHOLD CURRENT-DENSITY; EFFICIENCY; EPITAXY AB Output power of 2.26W and maximum power conversion efficiency of 57% were obtained for InGaAs-AlGaAs strained-layer quantum-well lasers (25-degrees-C, lambda congruent-to 1 mum). Output powers were 2.35W (-55-degrees-C) and 1.79W (75-degrees-C) with maximum power efficiencies of 51% (55-degrees-C) and 46% (75-degrees-C). C1 DAVID SARNOFF RES CTR,PRINCETON,NJ 08543. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP WANG, CA (reprint author), MIT,LINCOLN LAB,LEXINGTON,MA 02173, USA. NR 10 TC 1 Z9 3 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD APR 14 PY 1994 VL 30 IS 8 BP 646 EP 648 DI 10.1049/el:19940462 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA NL309 UT WOS:A1994NL30900024 ER PT J AU KUO, SC ZHANG, ZY KLEMM, RB LIEBMAN, JF STIEF, LJ NESBITT, FL AF KUO, SC ZHANG, ZY KLEMM, RB LIEBMAN, JF STIEF, LJ NESBITT, FL TI PHOTOIONIZATION OF HYDROXYMETHYL (CD2OH AND CD2OD) AND METHOXY (CD3O) RADICALS - PHOTOION EFFICIENCY SPECTRA, IONIZATION ENERGIES, AND THERMOCHEMISTRY SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID BOND-DISSOCIATION ENERGIES; GAS-PHASE; RATE CONSTANTS; PHOTOELECTRON-SPECTROSCOPY; TOTAL PRESSURE; CH3O; KINETICS; CH2OH; IONS; TEMPERATURE AB Photoion efficiency (PIE) spectra were obtained for CD2OH, CD2OD, and CD3O radicals using the discharge flow-photoionization mass spectrometry technique. The radicals were generated in a flow tube via reaction of F atoms with the appropriate methanol isotopomers (CD3OH --> CD2OH, CD3OD --> CD2OD, and CD3OH --> CD3O), which were in large excess. Deuterated methoxy radicals, CD3O, were also generated via the reaction of CD3 with NO2. Photoionization of the radicals was achieved using high intensity, dispersed synchrotron radiation, and ionization energies (IE) of these radicals were derived from the thresholds of the PIE spectra: IE(CD2OH) = 7.54 +/- 0.02 eV, IE(CD2OD) = 7.53 +/- 0.02 eV, and IE(CD3O) = 10.74 +/- 0.02 eV. The PIE spectra for CD2OH and CD3O are compared to those of a previous photoionization study, and differences are discussed. Integration of previously published photoelectron spectroscopy data for CD2OH yields a curve quite similar to our PIE spectrum. Empirical estimates of IE(CH2OH) and IE(CH3O) are given to corroborate our assignments. Attempts to detect CH3O+ from direct ionization of CH3O, which was generated by two methods (CH3OD + F and CH3 + NO2), were unsuccessful. However, HCO+, presumably formed along with H-2 from CH3O dissociative ionization, was detected at a threshold 8.73 eV. This appearance energy corresponds to a barrier of 17.6 kJ mol(-1) for the process CH3O* --> HCO+ + H-2. Heats of formation for neutral and ion species : were determined using literature values for the proton affinity of CH2O and integrated heat capacities and the IE's measured in this laboratory, and an energy level diagram was developed for T = 298 K. For hydroxymethyl and methoxy radicals the following values were obtained: Delta(f)H degrees(298)(CH2OH) = -20.4 kJ mol(-1) (which agrees well with the recent results of Traeger and Holmes, J. Phys. Chem. 1993, 97, 3453); Delta(f)H degrees(298)(CH3O) = 12.2 kJ mol(-1). Bond dissociation energies were also computed: D degrees(0)(H-CH2OH) = 393.1 kJ mol(-1) and D degrees(0)(CH3OH) = 426.6 kJ mol(-1). The measured ionization energies and the derived thermodynamic quantities are compared with previously reported results. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV MARYLAND,DEPT CHEM & BIOCHEM,CATONSVILLE,MD 21228. NASA,GODDARD SPACE FLIGHT CTR,EXTRATERR PHYS LAB,GREENBELT,MD 20771. NR 67 TC 40 Z9 41 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD APR 14 PY 1994 VL 98 IS 15 BP 4026 EP 4033 DI 10.1021/j100066a021 PG 8 WC Chemistry, Physical SC Chemistry GA NG219 UT WOS:A1994NG21900021 ER PT J AU RODRIGUEZ, JA HRBEK, J AF RODRIGUEZ, JA HRBEK, J TI ELECTRONIC AND CHEMICAL-PROPERTIES OF SILVER-LITHIUM ALLOY-FILMS - THE AG-LI, O-2/AG-LI, AND CO/AG-LI SYSTEMS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID MOLECULAR-OXYGEN; LIQUID CSAU; CO; ADSORPTION; RU(001); TRANSITION; OXIDATION; AG(111); SURFACE; METAL AB The properties of Ag-Li alloy films on Ru(001) have been investigated using TDS, XPS, XAES, and UPS. For equiatomic AgLi alloys, thermal decomposition starts at similar to 600 K. In the decomposition process of the silver lithium alloys, Ag-Li bonds are replaced by Ag-Ag bonds and the alkali metal segregates to the surface of the film before desorbing (600-950 K), with Ag remaining on top of the Ru substrate. Results of valence-band photoemission and XAES for silver lithium alloys and ab initio HF-SCF calculations for the diatomic AgLi molecule indicate that the charge transfer within the Ag-Li bond is small (Ag-delta--Li-delta+, delta < 0.4 e). In the alloys, the Ag-Li bond is best described as mostly metallic with a small degree of ionic character. This type of bonding does not have a major effect on the electron-donor properties of Li, and the element remains extremely reactive toward O-2 and CO. The interaction of O-2 with AgLi at 80 K produces O2- (the only oxygen ion at low O-2 exposures) and O-2(2-). The oxygen species break the Ag-Li bonds to form lithium oxides and very small Ag clusters that are dispersed within the film. Annealing to 800 K leads to sintering of these Ag clusters into large three-dimensional particles. At 80 K, silver-lithium alloys adsorb significant amounts of CO to form Li2O, LixCy, and Li-m(CO)(n) complexes that are stable up to temperatures above 300 K. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RI Hrbek, Jan/I-1020-2013 NR 73 TC 16 Z9 16 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD APR 14 PY 1994 VL 98 IS 15 BP 4061 EP 4068 DI 10.1021/j100066a026 PG 8 WC Chemistry, Physical SC Chemistry GA NG219 UT WOS:A1994NG21900026 ER PT J AU KATARI, JEB COLVIN, VL ALIVISATOS, AP AF KATARI, JEB COLVIN, VL ALIVISATOS, AP TI X-RAY PHOTOELECTRON-SPECTROSCOPY OF CDSE NANOCRYSTALS WITH APPLICATIONS TO STUDIES OF THE NANOCRYSTAL SURFACE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID CADMIUM TELLURIDE; SEMICONDUCTOR NANOCRYSTALS; CDTE SURFACES; THIN-FILMS; OXYGEN; OXIDE; OXIDATION; ELLIPSOMETRY; HG1-XCDXTE; BEHAVIOR AB We report the use of X-ray photoelectron spectroscopy (XPS) to determine the surface composition of semiconductor nanocrystals. Crystalline, nearly monodisperse CdSe nanocrystals ranging in radius from 9 to 30 Angstrom were chemically synthesized and covalently bound to Au and Si surfaces for study. XPS core level peak positions for Cd and Se were in agreement with those of bulk CdSe. We have determined that the majority of Se atoms on the surface are unbonded as prepared and that Cd atoms are bonded to the surface ligand, tri-n-octylphosphine oxide, to the extent that such bonding is sterically allowed. We have determined that the total ligand saturation of the nanocrystal surface varies from 60% in the smaller nanocrystals to 30% in the larger nanocrystals. In addition, we have determined that upon exposure of the nanocrystals to air Se surface sites are oxidized, forming a SeO2 surface film which causes the nanocrystals to degrade over time. The nanocrystal surface can be modified by dispersing the crystals in pyridine. Nearly all of the P ligands are removed in this case, leaving behind primarily unsaturated Cd and Se surface atoms. In this case, both Cd and Se oxidize upon exposure to air. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI Alivisatos , Paul /N-8863-2015 OI Alivisatos , Paul /0000-0001-6895-9048 NR 72 TC 685 Z9 692 U1 11 U2 144 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD APR 14 PY 1994 VL 98 IS 15 BP 4109 EP 4117 DI 10.1021/j100066a034 PG 9 WC Chemistry, Physical SC Chemistry GA NG219 UT WOS:A1994NG21900034 ER PT J AU BALTZ, AJ DOVER, CB KAHANA, SH PANG, Y SCHLAGEL, TJ SCHNEDERMANN, E AF BALTZ, AJ DOVER, CB KAHANA, SH PANG, Y SCHLAGEL, TJ SCHNEDERMANN, E TI STRANGE CLUSTER FORMATION IN RELATIVISTIC HEAVY-ION COLLISIONS SO PHYSICS LETTERS B LA English DT Article ID CHIRAL SOLITON MODELS; DOUBLE HYPERNUCLEUS; NUCLEAR COLLISIONS; MATTER; FRAGMENTS; DROPLETS; SYSTEMS; PIONS AB The production rate of strange clusters in relativistic heavy ion collisions is estimated using a simplified coalescence model and the cascade code ARC, adjusting parameters to fit ordinary composite particle production. We predict that a hypothetical (LAMBDALAMBDA)b would be produced at a rate dN/dy of order 0.1 for central Au + Au collisions at Brookhaven AGS energies and midrapidity. The corresponding rate for the (LAMBDALAMBDA)He-6 is 2 x 10(-5). We also suggest some experimental possibilities for detecting such clusters. C1 SUNY STONY BROOK, STONY BROOK, NY 11794 USA. RP BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. OI Kahana, Sidney/0000-0002-5790-9384 NR 36 TC 78 Z9 78 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 APR 14 PY 1994 VL 325 IS 1-2 BP 7 EP 12 DI 10.1016/0370-2693(94)90063-9 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NG474 UT WOS:A1994NG47400002 ER PT J AU BIGNOZZI, CA ARGAZZI, R CHIORBOLI, C SCANDOLA, F DYER, RB SCHOONOVER, JR MEYER, TJ AF BIGNOZZI, CA ARGAZZI, R CHIORBOLI, C SCANDOLA, F DYER, RB SCHOONOVER, JR MEYER, TJ TI VIBRATIONAL AND ELECTRONIC SPECTROSCOPY OF ELECTRONICALLY EXCITED POLYCHROMOPHORIC RUTHENIUM(II) COMPLEXES SO INORGANIC CHEMISTRY LA English DT Article ID TRANSITION-METAL COMPLEXES; INTRAMOLECULAR ENERGY-TRANSFER; RESOLVED RESONANCE RAMAN; MIXED-LIGAND COMPLEXES; NEAR-INFRARED SPECTRA; CHARGE-TRANSFER; POLYPYRIDINE COMPLEXES; PHOTOINDUCED ELECTRON; PHOTOPHYSICAL PROPERTIES; ABSORPTION-SPECTRA AB The metal to ligand charge-transfer excited states of the polychromophoric complexes [(NC-(bpy)2Ru(II)(CN)Ru(II)(bpy)2(CN)]+, [(NC)(bpy)2Ru(II)(CN)Ru(II)(Phen)2(CN)]+, [(NC)(Phen)2Ru(II)(CN)Ru(II)(bpy)2(CN)]+, [(NC)(bpy)2Ru(II)(CN)Ru(II)(bpy)2(NC)Ru(II)(bpy)2(CN)]2+, and [NC(bpy)2Ru(II)(CN)Ru(II)(dcb)2(NC)Ru( bpy)2(CN)]2- (bpy is 2,2'-bipyridine, phen is 1,10-phenanthroline, and dcb is 4,4'-dicarboxy-2,2'-bipyridine) and of model mononuclear complexes have been investigated in CH3CN by time-resolved resonance Raman (TR3) and transient UV/vis absorption spectroscopy. The observation in the TR3 spectra of vibrations of a single type of reduced ligand and the cross check obtained by exchanging ligands around the metal centers provide unambiguous evidence for localization of the excited electron on the polypyridine ligand of the N-bonded (to bridging CN-) chromophore. The presence of excited-state intervalence transfer bands has been inferred by the comparison of the transient absorbance spectra of the polynuclear complexes with the ground-state spectra of reduced and one-electron oxidized forms and with the spectra of the excited mononuclear complexes. These comparisons indicate the presence of distinct Ru(II) and Ru(III) centers in the excited states of the polynuclear complexes. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV N CAROLINA,DEPT CHEM,CHAPEL HILL,NC 27514. RP BIGNOZZI, CA (reprint author), UNIV FERRARA,CNR,CTR FOTOREATTIV & CATALISI,DIPARTIMENTO CHIM,I-44100 FERRARA,ITALY. RI Argazzi, Roberto/C-4819-2015; OI Argazzi, Roberto/0000-0002-2619-6860; Bignozzi, Carlo Alberto/0000-0002-7882-3694 NR 75 TC 68 Z9 68 U1 5 U2 17 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD APR 13 PY 1994 VL 33 IS 8 BP 1652 EP 1659 DI 10.1021/ic00086a015 PG 8 WC Chemistry, Inorganic & Nuclear SC Chemistry GA NF721 UT WOS:A1994NF72100015 ER PT J AU CHOU, MH SZALDA, DJ CREUTZ, C SUTIN, N AF CHOU, MH SZALDA, DJ CREUTZ, C SUTIN, N TI REACTIVITY AND COORDINATION CHEMISTRY OF AROMATIC CARBOXAMIDE RC(O)NH2 AND CARBOXYLATE LIGANDS - PROPERTIES OF PENTAAMMINERUTHENIUM(II) AND PENTAAMMINERUTHENIUM(III) COMPLEXES SO INORGANIC CHEMISTRY LA English DT Article ID CHARGE-TRANSFER SPECTRA; CRYSTAL-STRUCTURES; AMMINE COMPLEXES; RUTHENIUM(III); BOND; PENTACYANOFERRATE; ISOMERIZATION; MECHANISM; KINETICS; NITROGEN AB The pH dependences of the spectral and electrochemical properties of mononuclear carboxamido (NH3)5RuNHC-(O)R (R = Ph, 4-py-N-Me+, 4-py-N-H+) and carboxylato (NH3)5RuOC(O)R (R = 4-py-N-Me+) complexes of Ru(II) and Ru(III) in aqueous solution have been examined. In contrast to the carboxylate complex (E1/2=-0.053 V vs NHE), the deprotonated (-NHC(O)R-) Ru(III/II) couples have rather negative reduction potentials, -0.25 (R = Ph), -0.23 (R = 4-py), and -0.13 (R = N-Me-4-py) V vs NHE, which are pH independent above the pK(a) of the Ru(II) complex (pH 4-8 depending upon R). In contrast, the carboxamido-Ru(III) complexes are weak bases, being protonated only in strongly acidic solutions (e.g. 5 M HClO4). From the structural work (d(Ru(III)-amido N) for R = N-Me-4-py is 1.998(9) angstrom) and the behavior of the ligand-to-metal charge-transfer bands in carboxamido-Ru(III) complexes, considerable oxygen pip=ruthenium(III) pid bonding is inferred. The electronic absorption spectra of carboxamido ruthenium(II) complexes, produced either by reduction of the corresponding Ru(III) complex at high pH or by direct reaction of (NH3)5Ru(OH2)2+ with the amide in 0.01 M NaOH, exhibit intense (epsilon (2.5-7) x 10(3) M-1 cm-1) bands in the visible region arising from metal-to-ligand (aromatic ring) charge-transfer transitions. Rate and equilibrium constants for formation of the protonated Ru(II) amide complexes with R = Ph and R = 4-py-N-Me+ at 25-degrees-C and 0.1 M ionic strength are (7 +/- 1) X 10(-2) M-1 s-1 and 2 X 10(-3) M-1 for the first R and 1.2 x 1 10(-2) M-1 s-1 and 2.0 x 10(-3) M-1 for the second, respectively. For the carboxylate under similar conditions, the values 0.6 M-1 s-I and 0.6 M-1 are obtained. The free amide ligand N-methylisonicotinamide triflate undergoes rapid alkaline hydrolysis, yielding N-methylisonicotinate and ammonia under exceptionally mild conditions (2-h half-life in 0.01 M NaOH, 15-degrees-C). At 15, 25, and 35-degrees-C and 1 M ionic strength the rate of hydrolysis (monitored by UV-vis spectroscopy) is first order in the amide concentration. The dependence on hydroxide ion is between first and second order. Thus at 25-degrees-C, the second-order rate constant increases from 1.43 X 10(-2) M-1 s-1 at 0.01 M OH- to 3.08 x 10(-2) M-1 s-1 at 0.05 M OH-. The structures of the Ru(III) carboxamide [(NH3)5Ru(C7N2H8O)]-(ClO4)3, R = 4-py-N-Me+, and of the N-pyridyl-bonded Ru(II) complex of isonicotinamide (NH4)[Ru(NH3)5(C6N2H6O)](PF6)3 are reported. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 49 TC 42 Z9 43 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD APR 13 PY 1994 VL 33 IS 8 BP 1674 EP 1684 DI 10.1021/ic00086a018 PG 11 WC Chemistry, Inorganic & Nuclear SC Chemistry GA NF721 UT WOS:A1994NF72100018 ER PT J AU FUJITA, E CREUTZ, C AF FUJITA, E CREUTZ, C TI C-H BOND ACTIVATION BY COBALT(I) MACROCYCLES - RAPID H/D EXCHANGE BETWEEN MACROCYCLE AND ACETONITRILE SOLVENT SO INORGANIC CHEMISTRY LA English DT Note ID CARBON-DIOXIDE ACTIVATION; ELECTROCATALYTIC REDUCTION; AQUEOUS-SOLUTION; COMPLEXES; BINDING; CO2; THERMODYNAMICS; WATER; CATALYSIS; CHEMISTRY AB FT-IR and H-1 NMR spectra of CoL+ (L = 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene) in CD3CN indicate rapid H/D exchange of the deuterated solvent with the macrocycle amine protons (rate constant (5 +/- 1) X 10(-4) s-1 at (23 +/- 1) degrees-C) and slower exchange with the protons of the imine methyl and the methylene adjacent to the imine carbon atoms (marked with an asterisk in the figure); the process is anomalously rapid for ''simple'' proton transfer and signals reactivity of the metal center toward C-H activation. RP BROOKHAVEN NATL LAB, DEPT CHEM, POB 5000, UPTON, NY 11973 USA. RI Fujita, Etsuko/D-8814-2013 NR 33 TC 12 Z9 12 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0020-1669 EI 1520-510X J9 INORG CHEM JI Inorg. Chem. PD APR 13 PY 1994 VL 33 IS 8 BP 1729 EP 1730 DI 10.1021/ic00086a028 PG 2 WC Chemistry, Inorganic & Nuclear SC Chemistry GA NF721 UT WOS:A1994NF72100028 ER PT J AU CHUNG, YG JUE, T AF CHUNG, YG JUE, T TI MYOGLOBIN SIGNAL AS AN NMR TISSUE THERMOMETER - IMPLICATION FOR HYPERTHERMIA TREATMENT OF TUMORS SO BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR BASIS OF DISEASE LA English DT Article DE MYOGLOBIN; HYPERTHERMIA; TUMOR; NMR; THERMOMETRY ID RF AB Measuring local tissue temperature is critical in establishing a rational approach for hyperthermia treatment of tumors. We have found that the heme signals of myoglobin provide a unique basis for NMR thermometry in vivo. In particular the 5-methyl heme signal of MbCN exhibits a sharp, temperature-dependent resonance that is distinguishable in the tissue spectrum. Its calibrated chemical shift can then reflect the local tissue temperature in vivo. C1 LAWRENCE LIVERMORE NATL LAB,DEPT BIOL CHEM,DAVIS,CA 95616. NR 19 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0925-4439 J9 BBA-MOL BASIS DIS JI Biochim. Biophys. Acta-Mol. Basis Dis. PD APR 12 PY 1994 VL 1226 IS 1 BP 31 EP 36 DI 10.1016/0925-4439(94)90055-8 PG 6 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA NG545 UT WOS:A1994NG54500005 PM 8155736 ER PT J AU HAWRYLYCZ, M AF HAWRYLYCZ, M TI A GEOMETRIC IDENTITY FOR PAPPUS THEOREM SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article AB An expression in the exterior algebra of a Peano space yielding Pappus' theorem was originally given by Doubilet, Rota, and Stein [Doubilet, P., Rota, G.-C. & Stein, J. (1974) Stud. Appl. Math. 8, 185-216]. Motivated by an identity of Rota, I give an identity in a Grassmann-Cayley algebra of step 3, involving joins and meets alone, which expresses the theorem of Pappus. RP HAWRYLYCZ, M (reprint author), LOS ALAMOS NATL LAB,COMP RES & APPLICAT GRP,LOS ALAMOS,NM 87544, USA. NR 5 TC 5 Z9 5 U1 0 U2 0 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD APR 12 PY 1994 VL 91 IS 8 BP 2909 EP 2909 DI 10.1073/pnas.91.8.2909 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NF968 UT WOS:A1994NF96800010 PM 11607470 ER PT J AU MYATT, EA WESTHOLM, FA WEISS, DT SOLOMON, A SCHIFFER, M STEVENS, FJ AF MYATT, EA WESTHOLM, FA WEISS, DT SOLOMON, A SCHIFFER, M STEVENS, FJ TI PATHOGENIC POTENTIAL OF HUMAN MONOCLONAL IMMUNOGLOBULIN LIGHT-CHAINS - RELATIONSHIP OF IN-VITRO AGGREGATION TO IN-VIVO ORGAN DEPOSITION SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE AMYLOIDOSIS; BENCE JONES PROTEINS; MULTIPLE MYELOMA ID BENCE-JONES PROTEINS; SIZE-EXCLUSION CHROMATOGRAPHY; RAT; NEPHROTOXICITY; NEPHROPATHY; ASSOCIATION; AMYLOIDOSIS; SIMULATION AB The deposition of certain Bence Jones proteins as tubular casts, basement membrane precipitates, or amyloid fibrils results in the human fight-chain-associated renal and systemic diseases-myeloma (cast) nephropathy, light-chain deposition disease, and immunocyte-derived (primary Gr AL) amyloidosis. To determine if light-chain nephrotoxicity or amyloidogenicity is related to the propensity of these components to form high molecular weight aggregates under physiological conditions, we used a size-exclusion chromatographic system to study 40 different Bence Jones proteins. Each sample was tested over a wide range of protein concentration in three different buffers varying in pH, osmolality, and the presence or absence of low concentrations of urea. Thirty-three of the 35 proteins found clinically and/or experimentally to form in vivo pathologic light-chain deposits were shown to undergo high-order self-association and form high molecular weight aggregates. In contrast, of five nonpathologic proteins, one showed polymerization under the chromatographic conditions used. The correlation between the in vitro results achieved by size-exclusion chromatography and that found in vivo provides (i) a rapid diagnostic method to identify potential nephrotoxic or amyloidogenic Bence Jones proteins and (ii) an experimental means to gain new insight into the physicochemical basis of light-chain aggregation and the treatment of those invariably fatal disorders associated with pathologic light-chain deposition. C1 UNIV TENNESSEE,MED CTR,GRAD SCH MED,DEPT MED,HUMAN IMMUNOL & CANC PROGRAM,KNOXVILLE,TN 37920. RP MYATT, EA (reprint author), ARGONNE NATL LAB,CTR MECHANIST BIOL & BIOTECHNOL,ARGONNE,IL 60439, USA. FU NCI NIH HHS [CA10056]; NIDDK NIH HHS [DK43757] NR 33 TC 58 Z9 60 U1 0 U2 1 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD APR 12 PY 1994 VL 91 IS 8 BP 3034 EP 3038 DI 10.1073/pnas.91.8.3034 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NF968 UT WOS:A1994NF96800036 PM 8159701 ER PT J AU KENT, UM MAO, SY WOFSY, C GOLDSTEIN, B ROSS, S METZGER, H AF KENT, UM MAO, SY WOFSY, C GOLDSTEIN, B ROSS, S METZGER, H TI DYNAMICS OF SIGNAL-TRANSDUCTION AFTER AGGREGATION OF CELL-SURFACE RECEPTORS - STUDIES ON THE TYPE-I RECEPTOR FOR IGE SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE FC RECEPTOR; MAST CELL; PHOSPHOTYROSINE ID BASOPHILIC LEUKEMIA-CELLS; PROTEIN-TYROSINE PHOSPHORYLATION; FC-EPSILON-RI; HISTAMINE-RELEASE; IMMUNOGLOBULIN-E; MAST-CELLS; RAT; COMPONENT; COMPLEXES; PATHWAYS AB Many ligands stimulate cellular responses by aggregating the cell-surface receptors to which they are bound. We investigated several mechanistic questions related to aggregation of receptors by using the high-affinity receptor for IgE (Fc(epsilon)RI) on mast cells as a model system. We briefly exposed cells to covalently cross-linked oligomers of IgE and then added excess monomeric IgE to prevent further aggregation. Early events were examined by monitoring the phosphorylation of protein tyrosines; later events were examined by monitoring secretion. We found that aggregated receptors continue to signal both late and early events in the absence of formation of new aggregates. Additional experiments suggested that the clustered receptors undergo a dynamic process of phosphorylation and dephosphorylation. Our findings suggest that for these and related receptors that function by aggregation, the persistence of signal transduction is directly related to the intrinsic affinity of the ligand for the individual receptor. C1 UNIV NEW MEXICO,DEPT MATH & STAT,ALBUQUERQUE,NM 87131. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP KENT, UM (reprint author), NIAMSD,BETHESDA,MD 20892, USA. FU NIGMS NIH HHS [GM35556] NR 36 TC 42 Z9 42 U1 0 U2 0 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD APR 12 PY 1994 VL 91 IS 8 BP 3087 EP 3091 DI 10.1073/pnas.91.8.3087 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NF968 UT WOS:A1994NF96800047 PM 7512721 ER PT J AU BENNETT, MJ CHOE, S EISENBERG, D AF BENNETT, MJ CHOE, S EISENBERG, D TI DOMAIN SWAPPING - ENTANGLING ALLIANCES BETWEEN PROTEINS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE DIPHTHERIA TOXIN; EVOLUTION OF OLIGOMERS ID RIBULOSE-1,5-BISPHOSPHATE CARBOXYLASE-OXYGENASE; DIPHTHERIA-TOXIN; 3-DIMENSIONAL STRUCTURE; CRYSTAL-STRUCTURE; RESOLUTION; INTERFACES; FORM; REFINEMENT; BINDING; ENTRY AB The comparison of monomeric and dimeric diphtheria toxin (DT) reveals a mode for protein association which we call domain swapping. The structure of dimeric DT has been extensively refined against data to 2.0-angstrom resolution and a three-residue loop has been corrected as compared with our published 2.5-angstrom-resolution structure. The monomeric DT structure has also been determined, at 2.3-angstrom resolution. Monomeric DT is a Y-shaped molecule with three domains: catalytic (C), transmembrane (T), and receptor binding (R). Upon freezing in phosphate buffer, DT forms a long-lived, metastable dimer. The protein chain tracing discloses that upon dimerization an unprecedented conformational rearrangement occurs: the entire R domain from each molecule of the dimer is exchanged for the R domain from the other. This involves breaking the noncovalent interactions between the R domain and the C and T domains, rotating the R domain by 180-degrees with atomic movements up to 65 angstrom, and re-forming the same noncovalent interactions between the R domain and the C and T domains of the other chain of the dimer. This conformational transition explains the long life and metastability of the DT dimer. Several other intertwined, dimeric protein structures satisfy our definition of domain swapping and suggest that domain swapping may be the molecular mechanism for evolution of these oligomers and possibly of oligomeric proteins in general. C1 UNIV CALIF LOS ANGELES,DEPT CHEM & BIOCHEM,INST MOLEC BIOL,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,US DOE,STRUCT BIOL & MOLEC MED LAB,LOS ANGELES,CA 90024. NR 38 TC 378 Z9 378 U1 5 U2 16 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 APR 12 PY 1994 VL 91 IS 8 BP 3127 EP 3131 DI 10.1073/pnas.91.8.3127 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NF968 UT WOS:A1994NF96800055 PM 8159715 ER PT J AU FLEETWOOD, DM SHANEYFELT, MR SCHWANK, JR AF FLEETWOOD, DM SHANEYFELT, MR SCHWANK, JR TI ESTIMATING OXIDE-TRAP, INTERFACE-TRAP, AND BORDER-TRAP CHARGE-DENSITIES IN METAL-OXIDE-SEMICONDUCTOR TRANSISTORS SO APPLIED PHYSICS LETTERS LA English DT Article ID 1/F NOISE; DEVICES AB A simple method is described that combines conventional threshold-voltage and charge-pumping measurements on n- and p-channel metal-oxide-semiconductor (MOS) transistors to estimate radiation-induced oxide-, interface-, and border-trap charge densities. In some devices, densities of border traps (near-interfacial oxide traps that exchange charge with the underlying Si) approach or exceed the density of interface traps, emphasizing the need to distinguish border-trap contributions to MOS radiation response and long-term reliability from interface-trap contributions. Estimates of border-trap charge densities obtained via this new dual-transistor technique agree well with trap densities inferred from 1/f noise measurements for transistors with varying channel length. RP FLEETWOOD, DM (reprint author), SANDIA NATL LABS,DEPT 1332,ALBUQUERQUE,NM 87185, USA. NR 18 TC 66 Z9 68 U1 1 U2 17 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 APR 11 PY 1994 VL 64 IS 15 BP 1965 EP 1967 DI 10.1063/1.111757 PG 3 WC Physics, Applied SC Physics GA NE709 UT WOS:A1994NE70900025 ER PT J AU MAJER, G RENZ, W BARNES, RG AF MAJER, G RENZ, W BARNES, RG TI THE MECHANISM OF HYDROGEN DIFFUSION IN ZIRCONIUM DIHYDRIDES SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; TITANIUM HYDRIDE; RELAXATION AB Hydrogen diffusion in ZrH(x) (1.58 less-than-or-equal-to x less-than-or-equal-to 1.98) in the temperature range 600 K to 970 K has been measured by means of pulsed-field-gradient nuclear magnetic resonance. The activation enthalpy for hydrogen diffusion, H(a), obtained by fitting an Arrhenius expression D = D0 exp(-H(a)/k(B)T) to the diffusivities, increases sharply as x approaches the limiting value of two in good agreement with results deduced from the proton spin-lattice relaxation rate, GAMMA1, measured on the same samples. Hydrogen atoms jump predominantly between nearest-neighbour tetrahedral sites in ZrH(x). The observed concentration dependence of both the effective value of H(a) and the pre-exponential factor D0 suggests, however, that at high hydrogen concentrations and high temperatures another interstitial site is occupied in addition. At x --> 2 a small fraction of hydrogen atoms located on an interstitial site other than the tetrahedral site appears to contribute significantly to the diffusivity. The temperature and concentration dependence of the diffusion data can quantitatively be described by such a model. The activation enthalpies for all possible jumps in this system with two different kinds of site are shown to be independent of the hydrogen concentration x. The corresponding attempt frequencies v(a) almost-equal-to 10(13) s-1 are compatible with the picture of a classical diffusion mechanism. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP MAJER, G (reprint author), MAX PLANCK INST MET RES,INST PHYS,HEISENBERGSTR 1,D-70569 STUTTGART,GERMANY. NR 25 TC 23 Z9 23 U1 0 U2 5 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 APR 11 PY 1994 VL 6 IS 15 BP 2935 EP 2942 DI 10.1088/0953-8984/6/15/015 PG 8 WC Physics, Condensed Matter SC Physics GA NF886 UT WOS:A1994NF88600015 ER PT J AU ODAY, SC BIENIOSEK, FM AF ODAY, SC BIENIOSEK, FM TI 8.9GEV(P)OVER-BAR YIELD MEASUREMENTS AT THE FERMILAB ANTIPROTON SOURCE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB The pBAR yield at 8.89+/-0.18 GeV has been measured for different lithium collection lens gradients and lens to target distances. Using an empirical pBAR production and collection model, the yield as a function of production angle and vertex position in the target has been extracted. Data taken for different targets indicates that the pBAR yield varies little as a function of atomic weight. A reduction in the Re target yield due to target melting was measured for the nominal proton intensity on target. An enhancement in Cu pBAR production was observed for proton beam targeted very near the interface with a lighter material (Al) disk. RP ODAY, SC (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD APR 11 PY 1994 VL 343 IS 2-3 BP 343 EP 350 DI 10.1016/0168-9002(94)90211-9 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NG654 UT WOS:A1994NG65400005 ER PT J AU NEUFFER, D OHMORI, C AF NEUFFER, D OHMORI, C TI CALCULATIONS OF THE CONDITIONS FOR BUNCH LEAKAGE IN THE LOS-ALAMOS PROTON STORAGE-RING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Observations are consistent with the possibility of an ''e-p'' instability in the Los Alamos Proton Storage Ring (PSR) with both bunched and unbunched beam. The instability requires electrons to be trapped within the beam, and calculations have shown that such trapping requires leakage of beam into the interbunch gap. Observationally, leakage of beam into the gap appears necessary for the onset of the instability. In this paper we present results of studies of the longitudinal beam dynamics at PSR parameters. The studies indicate that the combined effects of the rf buncher, longitudinal space charge, and injection mismatch are sufficient to cause the observed bunch leakage. Simulation results are presented and compared with PSR observations. Variations of PSR performance parameters are considered, and methods of improving bunch confinement are suggested and studied. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP NEUFFER, D (reprint author), CEBAF,12000 JEFFERSON AVE,NEWPORT NEWS,VA 23606, USA. NR 6 TC 12 Z9 12 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 APR 11 PY 1994 VL 343 IS 2-3 BP 390 EP 400 DI 10.1016/0168-9002(94)90216-X PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NG654 UT WOS:A1994NG65400010 ER PT J AU BAKKEN, JA BARONE, L BAY, A BLAISING, JJ BORGIA, B BOURILKOV, D BOUTIGNY, D BROCK, IC BUISSON, C CAPELL, M CHATURVEDI, UK CHEMARIN, M CLARE, R COIGNET, G DENES, P DENOTARISTEFANI, F DIEMOZ, M DUCHESNEAU, D ELMAMOUNI, H EXTERMANN, P FAY, J FERRONI, F GAILLOUD, M GOUJON, D GRATTA, G GUPTA, VK HILGERS, K ILLE, B JANSSEN, H KARYOTAKIS, Y KASSER, A KIENZLEFOCACCI, MN KRENZ, W LEBRUN, P LECOQ, P LEONARDI, E LINDE, FL LINDEMANN, B LONGO, E LU, YS LUCI, C LUCKEY, D MARTIN, JP MERK, M MICKE, M MORGANTI, S NEWMAN, H ORGANTINI, G PIROUE, PA READ, K ROSIERLEES, S ROSSELET, P SAUVAGE, G SCHMITZ, D SCHNEEGANS, M SCHWENKE, J STICKLAND, DP TULLY, C VALENTE, E VIVARGENT, M VUILLEUMIER, L WANG, YF WEBER, A WEILL, R WENNINGER, J AF BAKKEN, JA BARONE, L BAY, A BLAISING, JJ BORGIA, B BOURILKOV, D BOUTIGNY, D BROCK, IC BUISSON, C CAPELL, M CHATURVEDI, UK CHEMARIN, M CLARE, R COIGNET, G DENES, P DENOTARISTEFANI, F DIEMOZ, M DUCHESNEAU, D ELMAMOUNI, H EXTERMANN, P FAY, J FERRONI, F GAILLOUD, M GOUJON, D GRATTA, G GUPTA, VK HILGERS, K ILLE, B JANSSEN, H KARYOTAKIS, Y KASSER, A KIENZLEFOCACCI, MN KRENZ, W LEBRUN, P LECOQ, P LEONARDI, E LINDE, FL LINDEMANN, B LONGO, E LU, YS LUCI, C LUCKEY, D MARTIN, JP MERK, M MICKE, M MORGANTI, S NEWMAN, H ORGANTINI, G PIROUE, PA READ, K ROSIERLEES, S ROSSELET, P SAUVAGE, G SCHMITZ, D SCHNEEGANS, M SCHWENKE, J STICKLAND, DP TULLY, C VALENTE, E VIVARGENT, M VUILLEUMIER, L WANG, YF WEBER, A WEILL, R WENNINGER, J TI RESULTS ON THE CALIBRATION OF THE L3 BGO CALORIMETER WITH COSMIC-RAYS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID ELECTROMAGNETIC CALORIMETER AB During 1991 two cosmic rays runs took place for the calibration of the L3 electromagnetic calorimeter. In this paper we present the results of the first high statistics cosmic ray calibration of the calorimeter in situ, including the end caps. Results show that the accuracy on the measurement of the calibration constants that can be achieved in one month of data taking is of 1.3%. C1 NIKHEF,1009 DB AMSTERDAM,NETHERLANDS. IN2P3,LAPP,CNRS,F-74941 ANNECY LE VIEUX,FRANCE. IHEP,100039 BEIJING,PEOPLES R CHINA. INFN,SEZ BOLOGNA,I-40126 BOLOGNA,ITALY. HUNGARIAN ACAD SCI,CENT RES INST,H-1525 BUDAPEST 114,HUNGARY. 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. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV LYON 1,INST PHYS NUCL LYON,IN2P3,CNRS,F-69622 VILLEURBANNE,FRANCE. MOSCOW THEORET & EXPTL PHYS INST,MOSCOW,RUSSIA. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. CATHOLIC UNIV NIJMEGEN,6525 ED NIJMEGEN,NETHERLANDS. INFN,SEZ ROMA,I-00185 ROME,ITALY. CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. MIT,CAMBRIDGE,MA 02139. UNIV LAUSANNE,CH-1015 LAUSANNE,SWITZERLAND. CALTECH,PASADENA,CA 91125. PRINCETON UNIV,PRINCETON,NJ 08544. UNIV ROMA LA SAPIENZA,I-00185 ROME,ITALY. RP BAKKEN, JA (reprint author), RHEIN WESTFAL TH AACHEN,INST PHYS 1,D-55056 AACHEN,GERMANY. NR 13 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD APR 11 PY 1994 VL 343 IS 2-3 BP 456 EP 462 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NG654 UT WOS:A1994NG65400018 ER PT J AU AUCHINCLOSS, PS DEBARBARO, P BODEK, A BUDD, H PILLAI, M QUN, F SAKUMOTO, WK MERRITT, FS OREGLIA, MJ SCHUMM, B BOLTON, T ARROYO, C BACHMANN, KT BAZARKO, AO BLAIR, RE FOUDAS, C KING, BJ LEFMANN, WC LEUNG, WC MISHRA, SR OLTMAN, E QUINTAS, PZ RABINOWITZ, SA SCIULLI, F SELIGMAN, WG SHAEVITZ, MH BERNSTEIN, RH BORCHERDING, F FISK, HE LAMM, M MARSH, W MERRITT, KWB SCHELLMAN, H YOVANOVITCH, D KINNEL, TS SANDLER, P SMITH, WH AF AUCHINCLOSS, PS DEBARBARO, P BODEK, A BUDD, H PILLAI, M QUN, F SAKUMOTO, WK MERRITT, FS OREGLIA, MJ SCHUMM, B BOLTON, T ARROYO, C BACHMANN, KT BAZARKO, AO BLAIR, RE FOUDAS, C KING, BJ LEFMANN, WC LEUNG, WC MISHRA, SR OLTMAN, E QUINTAS, PZ RABINOWITZ, SA SCIULLI, F SELIGMAN, WG SHAEVITZ, MH BERNSTEIN, RH BORCHERDING, F FISK, HE LAMM, M MARSH, W MERRITT, KWB SCHELLMAN, H YOVANOVITCH, D KINNEL, TS SANDLER, P SMITH, WH TI A STUDY OF THE ENERGY-DEPENDENCE OF THE MEAN, TRUNCATED MEAN, AND MOST PROBABLE ENERGY DEPOSITION OF HIGH-ENERGY MUONS IN SAMPLING CALORIMETERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB We have extracted the momentum dependence of the mean, the truncated mean and the most probable value of the energy deposited in a segmented, iron-scintillator, hadron calorimeter by high-energy muons. Data were drawn from a sample of momentum-analyzed, high-energy muons produced in charged-current neutrino interactions. The truncated mean energy deposition of high-energy muons traversing 20 calorimeter segments increases by approximately 16% per 100 GeV/c increase in muon momentum over the range 25-125 GeV/c; the most probable energy deposition increases by approximately 7%. These results are important for experiments at high-energy colliders (e.g., Tevatron, SSC and LHC) which use the dE/dx of high-energy muons to calibrate the response of electromagnetic and hadron calorimeters with tower geometry. The data are in qualitative agreement with GEANT3 (v3.15/308a) simulations. C1 UNIV ROCHESTER,DEPT PHYS & ASTRON,ROCHESTER,NY 14627. UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637. COLUMBIA UNIV,DEPT PHYS,NEW YORK,NY 10027. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. OI Bernstein, Robert/0000-0002-7610-950X NR 6 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD APR 11 PY 1994 VL 343 IS 2-3 BP 463 EP 469 DI 10.1016/0168-9002(94)90225-9 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NG654 UT WOS:A1994NG65400019 ER PT J AU BUDAGOV, J CHIRIKOVZORIN, I GLAGOLEV, V JORDANOV, A KHARZHEEV, Y LIBA, I MALYUKOV, S RUSSAKOVICH, NA RUSSAKOVICH, NL SOLOVYEV, A ROHAC, J TOKAR, S PANTEA, D COX, B DUKES, E PARA, A CHLACHIDZE, G KHUBUA, J MINASHVILI, I ASLANIAN, E BAGDASAROV, S POGOSYAN, G BARAN, A LAVROVA, Z LEVIN, V POROSHIN, N AF BUDAGOV, J CHIRIKOVZORIN, I GLAGOLEV, V JORDANOV, A KHARZHEEV, Y LIBA, I MALYUKOV, S RUSSAKOVICH, NA RUSSAKOVICH, NL SOLOVYEV, A ROHAC, J TOKAR, S PANTEA, D COX, B DUKES, E PARA, A CHLACHIDZE, G KHUBUA, J MINASHVILI, I ASLANIAN, E BAGDASAROV, S POGOSYAN, G BARAN, A LAVROVA, Z LEVIN, V POROSHIN, N TI ENERGY RESOLUTION OF A LEAD SCINTILLATING-FIBER ELECTROMAGNETIC CALORIMETER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB A calorimeter module was fabricated using profiled lead plates and scintillating fibers with diameter 1 mm and attenuation length about 80 cm. The absorber-to-fiber volume ratio was 1. 17 and the module average radiation length X0 congruent-to 1.05 cm. The energy resolution of the module was investigated using the electron beams of U-70 at Serpukhav and of the SPS at CERN in the energy range 5-70 GeV. The energy resolution at theta = 3-degrees (the angle between the fiber axis and the beam direction) may be expressed by the formula sigma/E (%) = 13.1/square-root E + 1.7. The energy resolution was also simulated by Monte Carlo and good agreement with the experiment has been achieved. C1 COMENIUS UNIV BRATISLAVA,CS-80100 BRATISLAVA,SLOVAKIA. UNIV VIRGINIA,CHARLOTTESVILLE,VA 22903. INST ATOM PHYS,BUCHAREST,ROMANIA. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. TBILISI STATE UNIV,INST HIGH ENERGY PHYS,TBILISI,REP OF GEORGIA. ENGN CTR POLYMER OPT FIBERS,TVER,RUSSIA. MOSCOW ING PHYS INST,MOSCOW,RUSSIA. RP BUDAGOV, J (reprint author), DUBNA JOINT NUCL RES INST,SSC LAB,DUBNA,RUSSIA. NR 15 TC 3 Z9 3 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 APR 11 PY 1994 VL 343 IS 2-3 BP 476 EP 483 DI 10.1016/0168-9002(94)90227-5 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NG654 UT WOS:A1994NG65400021 ER PT J AU BARON, AQR RUBY, SL AF BARON, AQR RUBY, SL TI TIME-RESOLVED DETECTION OF X-RAYS USING LARGE-AREA AVALANCHE PHOTODIODES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID SILICON; RESOLUTION; SPECTROSCOPY; DIODES AB We have measured the efficiencies and time responses of several large-area (200 and 80 mm2) beveled-edge avalanche photodiodes to X-rays of energy 6-20 keV in a photon counting mode. The diodes were used with avalanche gains of 10(2) to 10(3). Detector efficiency varied from approximately 50% at 8 keV to approximately 5% at 20 keV, while the time resolution was approximately 1/2 ns with a tail out to longer times (approximately 5 ns). The duration of the tail may be reduced ( < 2 ns) by selecting only larger pulses from the diode (increasing the discriminator threshold). These results are well explained by a simple physical picture of the device: the fast response is due to X-rays absorbed in the depletion layer, and the tail results from X-rays absorbed in a low-field undepleted region in front of the diode. For one device, the total active thickness (depletion and low field region) was measured to be 49 mum and the low field region to be 9 mum. RP BARON, AQR (reprint author), STANFORD LINEAR ACCELERATOR CTR,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309, USA. NR 28 TC 49 Z9 49 U1 1 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 APR 11 PY 1994 VL 343 IS 2-3 BP 517 EP 526 DI 10.1016/0168-9002(94)90232-1 PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NG654 UT WOS:A1994NG65400026 ER PT J AU ZHANG, Z BRAUNMUNZINGER, P CLELAND, W DAVID, G LISSAUER, D AF ZHANG, Z BRAUNMUNZINGER, P CLELAND, W DAVID, G LISSAUER, D TI RESPONSE MATRIX APPROACH TO THE ANALYSIS OF CALORIMETRY DATA SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID HADRONS AB We describe a correction procedure for calorimetry data based on a response matrix approach. The response matrix is calculated using a Monte Carlo event generator coupled with a fast deposition program which simulates the response of the calorimeter to hadronic and electromagnetic showers. The data which are analyzed are transverse energy measurements from a relativistic heavy ion experiment (E814/E877) at the Brookhaven AGS. We use the method to determine the differential cross section (dsigma/dE(T)) as well as the spatial distribution of transverse energy (dE(T)/d(eta)), both in bins of pseudorapidity eta and as a parameterized function of eta. The method is found to be insensitive to the characteristics of the event generator. C1 UNIV PITTSBURGH,PITTSBURGH,PA 15260. SUNY STONY BROOK,STONY BROOK,NY 11794. BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 10 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD APR 11 PY 1994 VL 343 IS 2-3 BP 610 EP 615 DI 10.1016/0168-9002(94)90244-5 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NG654 UT WOS:A1994NG65400038 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R ALEKSEEV, GD ALLPORT, P ALMEHED, S ALMEIDA, FML ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLOCKI, J BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUDINOV, E BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUDZIAK, A BUGGE, L BURAN, T BUYS, A BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASES, R CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHARPENTIER, P CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVIES, J DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C LASO, MDMD DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EEK, LO EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FALALEEV, V FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FORMENTI, F FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GILLESPIE, D GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY GOPAL, G GORN, L GORSKI, M GRACCO, V GRARD, F GRAZIANI, E GROSDIDIER, G GROSSETETE, B GUNNARSSON, P GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERNANDO, JA HERQUET, P HERR, H HESSING, TL HIGGINS, CO HIGON, E HILKE, HJ HILL, TS HODGSON, SD HOFMOKL, T HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HONORE, PF HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JACOBSSON, R JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONKER, M JONSSON, L JUILLOT, P KAISER, M KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LEVY, JM LIEB, E LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTI, S MARTINEZRIVERO, C MARTINEZVIDAL, F MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G ROMERO, A RONCAGLIOLO, I RONCHESE, P ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORASSA, E TORTORA, L TREILLE, D TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VANELDIK, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WORMSER, G WOSCHNAGG, K ZAITSEV, A ZALEWSKA, A ZANINI, L ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G AF ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R ALEKSEEV, GD ALLPORT, P ALMEHED, S ALMEIDA, FML ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLOCKI, J BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUDINOV, E BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUDZIAK, A BUGGE, L BURAN, T BUYS, A BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASES, R CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHARPENTIER, P CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVIES, J DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C LASO, MDMD DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EEK, LO EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FALALEEV, V FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FORMENTI, F FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GILLESPIE, D GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY GOPAL, G GORN, L GORSKI, M GRACCO, V GRARD, F GRAZIANI, E GROSDIDIER, G GROSSETETE, B GUNNARSSON, P GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERNANDO, JA HERQUET, P HERR, H HESSING, TL HIGGINS, CO HIGON, E HILKE, HJ HILL, TS HODGSON, SD HOFMOKL, T HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HONORE, PF HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JACOBSSON, R JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONKER, M JONSSON, L JUILLOT, P KAISER, M KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LEVY, JM LIEB, E LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTI, S MARTINEZRIVERO, C MARTINEZVIDAL, F MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G ROMERO, A RONCAGLIOLO, I RONCHESE, P ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORASSA, E TORTORA, L TREILLE, D TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VANELDIK, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WORMSER, G WOSCHNAGG, K ZAITSEV, A ZALEWSKA, A ZANINI, L ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G TI MEASUREMENTS OF THE LINESHAPE OF THE Z(0) AND DETERMINATION OF ELECTROWEAK PARAMETERS FROM ITS HADRONIC AND LEPTONIC DECAYS SO NUCLEAR PHYSICS B LA English DT Article ID LEP-SLC ENERGIES; RADIATIVE-CORRECTIONS; BHABHA SCATTERING; MASS CORRECTIONS; PHYSICS AB During the LEP running periods in 1990 and 1991 DELPHI has accumulated approximately 450000 Z0 decays into hadrons and charged leptons. The increased event statistics coupled with improved analysis techniques and improved knowledge of the LEP beam energies permit significantly better measurements of the mass and width of the Z0 resonance. Model independent fits to the cross sections and leptonic forward-backward asymmetries yield the following Z0 parameters: the mass and total width M(Z) = 91.187 +/- 0.009 GeV, GAMMA(Z) = 2.486 +/- 0.012 GeV, the hadronic and leptonic partial widths GAMMA(had) = 1.725 +/- 0.012GeV, GAMMA(l) = 83.01 +/- 0.52 MeV, the invisible width GAMMA(inv) = 512 +/- 10 MeV, the ratio of hadronic to leptonic partial widths R(l) = 20.78 +/- 0.15, and the Born level hadronic peak cross section sigma0 = 40.90 +/- 0.28 nb. Using these results and the value of alpha(s) determined from DELPHI data, the number of light neutrino species is determined to be 3.08 +/- 0.05. The individual leptonic widths are found to be: GAMMA(e) = 82.93 +/- 0.70 MeV, GAMMA(mu) = 83.20 +/- 1.11 MeV and GAMMA(tau) = 82.89 +/- 1.31 MeV. Using the measured leptonic forward-backward asymmetries and assuming lepton universality, the squared vector and axial-vector couplings of the Z0 to charged leptons are found to be g(V)l2 = (1.47 +/- 0.51) x 10(-3) and g(A)l2 = 0.2483 +/- 0.0016. A full Standard Model fit to the data yields a value of the top mass m(t) = 115(-82)+52 (expt.)-24(+23) (Higgs) GeV, corresponding to a value of the weak mixing angle sin2 theta(eff)lept = 0.2339 +/- 0.0015(expt.)-0.0004(+0.0001) (Higgs). Values are obtained for the variables S and T, or epsilon1 and epsilon3 which parameterize electroweak loop effects. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,B-2610 WILRIJK,BELGIUM. ULB VUB,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. INFN,I-40126 BOLOGNA,ITALY. COLL FRANCE,PHYS CORPUSCULAIRE LAB,IN2P3,CNRS,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. ULP,CTR RECH NUCL,IN2P3,CNRS,F-67037 STRASBOURG,FRANCE. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. CAS,DIV HIGH ENERGY PHYS,FZU,INST PHYS,CS-18040 PRAGUE 8,CZECH REPUBLIC. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. INFN,I-16146 GENOA,ITALY. UNIV GRENOBLE,INST SCI NUCL,IN2P3,CNRS,F-38626 GRENOBLE,FRANCE. UNIV HELSINKI,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. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. UNIV PARIS 11,ACCELERATEUR LINEAR LAB,IN2P3,CNRS,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV PARIS 06,LPNHE,IN2P3,CNRS,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,F-75252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV LYON 1,IPNL,IN2P3,CNRS,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE MADRID,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,CPP,IN2P3,CNRS,F-13288 MARSEILLE 09,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. INFN,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN O,DENMARK. CHARLES UNIV,NUCL CTR MFF,NC,CS-18000 PRAGUE 8,CZECH REPUBLIC. NIKEF 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. INFN,I-35131 PADUA,ITALY. PONTIFICIA UNIV CATOLICA,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. INFN,I-00173 ROME,ITALY. DAPNIA,DSM,CTR ETUD SACLAY,F-91191 GIF SUR YVETTE,FRANCE. INFN,IST SUPER SANITA,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN. PROTVINO HIGH ENERGY PHYS INST,PROTVINO,RUSSIA. UNIV LJUBLJANA,J STEFAN INST,61000 LJUBLJANA,SLOVENIA. UNIV LJUBLJANA,DEPT PHYS,61000 LJUBLJANA,SLOVENIA. UNIV STOCKHOLM,S-11385 STOCKHOLM,SWEDEN. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. INFN,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. INFN,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. UNIV FED RIO DE JANEIRO,ILHA FDN,BR-21945970 RIO JANEIRO,BRAZIL. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. CSIC,IFIC,E-46100 BURJASSOT,SPAIN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. UNIV WARSAW,PL-00681 WARSAW,POLAND. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. RP ABREU, P (reprint author), FCUL,IST,LIP,AVE ELIAS GARCIA,14-10,P-1000 LISBON,PORTUGAL. RI Andreazza, Attilio/E-5642-2011; Nomerotski, Andrei/A-5169-2010; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Krammer, Manfred/A-6508-2010; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Torassa, Ezio/I-1788-2012; Giacomelli, Paolo/B-8076-2009; Fruhwirth, Rudolf/H-2529-2012; de Paula, Leandro/I-9278-2012; Verlato, Marco/J-4604-2012; Dracos, Marcos/K-2335-2012; Hallgren, Allan/A-8963-2013; Botner, Olga/A-9110-2013; Marti-Garcia, Salvador/F-3085-2011; Vaz, Pedro/K-2464-2013; Monge, Maria Roberta/G-9127-2012; Nemecek, Stanislav/G-5931-2014; Ridky, Jan/H-6184-2014; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Espirito Santo, Maria Catarina/L-2341-2014; Pimenta, Mario/M-1741-2013; Gomez Cadenas, Juan Jose/L-2003-2014; Hernando Morata, Jose Angel/L-7642-2014; gandelman, miriam/N-3739-2014; Ragazzi, Stefano/D-2463-2009; Zuniga, Juan/P-4385-2014; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Smirnova, Oxana/A-4401-2013; Lozano-Bahilo, Julio/F-4881-2016; Olshevskiy, Alexander/I-1580-2016; Rames, Jiri/H-2450-2014; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; OI De Lotto, Barbara/0000-0003-3624-4480; Peralta, Luis/0000-0002-3834-1762; Tabarelli de Fatis, Tommaso/0000-0001-6262-4685; Lacasta, Carlos/0000-0002-2623-6252; Torassa, Ezio/0000-0003-2321-0599; Andreazza, Attilio/0000-0001-5161-5759; Ruiz, Alberto/0000-0002-3639-0368; Krammer, Manfred/0000-0003-2257-7751; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; de Paula, Leandro/0000-0002-4984-7734; Verlato, Marco/0000-0003-1967-7655; Dracos, Marcos/0000-0003-0514-193X; Vaz, Pedro/0000-0002-7186-2359; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Tome, Bernardo/0000-0002-7564-8392; Espirito Santo, Maria Catarina/0000-0003-1286-7288; Pimenta, Mario/0000-0002-2590-0908; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Hernando Morata, Jose Angel/0000-0002-8683-5142; Ragazzi, Stefano/0000-0001-8219-2074; Zuniga, Juan/0000-0002-1041-6451; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Smirnova, Oxana/0000-0003-2517-531X; Lozano-Bahilo, Julio/0000-0003-0613-140X; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Matteuzzi, Clara/0000-0002-4047-4521; DE MIN, ALBERTO/0000-0002-8130-9389; Demaria, Natale/0000-0003-0743-9465; Bonesini, Maurizio/0000-0001-5119-1896; Sannino, Mario/0000-0001-7700-8383; Maio, Amelia/0000-0001-9099-0009; De Angelis, Alessandro/0000-0002-3288-2517; PREST, MICHELA/0000-0003-3161-4454 NR 35 TC 36 Z9 36 U1 0 U2 8 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 APR 11 PY 1994 VL 417 IS 1-2 BP 3 EP 57 DI 10.1016/0550-3213(94)90537-1 PG 55 WC Physics, Particles & Fields SC Physics GA NK183 UT WOS:A1994NK18300001 ER PT J AU ABACHI, S ABBOTT, B ABOLINS, M ACHARYA, BS ADAM, I ADAMS, DL ADAMS, M AHN, S AIHARA, H ALVAREZ, G ALVES, GA AMOS, N ANDERSON, EW ANTIPOV, Y ARONSON, SH ASTUR, R AVERY, RE BADEN, A BALAMURALI, V BALDERSTON, J BALDIN, B BANTLY, J BARTLETT, JF BAZIZI, K BEHNKE, T BENDICH, J BERI, SB BEZZUBOV, V BHAT, PC BHATNAGAR, V BISWAS, N BLAZEY, G BLESSING, S BOEHNLEIN, A BORCHERDING, F BORDERS, J BOZKO, N BRANDT, A BROCK, R BROSS, A BUCHHOLZ, D BURTOVOI, V BUTLER, JM CALLOT, OH CASTILLAVALDEZ, H CHAKRABORTY, D CHEKULAEV, S CHEN, J CHEN, LP CHEN, W 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, M CUSSONNEAU, JP CUTTS, D DAHL, OI DE, K DEMARTEAU, M DEMINA, R DENISENKO, K DENISENKO, N DENISOV, D DENISOV, S DHARMARATNA, W DIEHL, HT DIESBURG, M DIXON, R DRAPER, P DUCROS, Y DURSTONJOHNSON, S EARTLY, D EDMUNDS, D EFIMOV, A ELLISON, J ELVIRA, VD ENGELMANN, R EPPLEY, G EROSHIN, O EVDOKIMOV, V FAHEY, S FANOURAKIS, G FATYGA, M FATYGA, MK FEATHERLY, J FEHER, S FEIN, D FERBEL, T FINOCCHIARO, G FISK, HE FLATTUM, E FORDEN, GE FORTNER, M FRANZINI, P FREDERIKSEN, S FUESS, S GAO, CS GELD, TL GENSER, K GERBER, CE GIBBARD, B GLEBOV, V GLICENSTEIN, JF GOBBI, B GOFORTH, M GOLDSCHMIDT, A GOMEZ, B GOOD, ML GORDON, H GRAF, N GRANNIS, PD GREEN, DR GREEN, J GREENLEE, H GROSSMAN, N GRUDBERG, P GRUNENDAHL, S GUIDA, JA GUIDA, JM GURYN, W HADLEY, NJ HAGGERTY, H HAGOPIAN, S HAGOPIAN, V HALL, RE HANSEN, S HAUPTMAN, JM HEDIN, D HEINSON, AP HEINTZ, U HERRERACORRAL, G HEURING, T HIROSKY, R HOENEISEN, B HOFTUN, JS HU, T HUBBARD, JR HUEHN, T IGARASHI, S ITO, AS JAMES, E JAQUES, J JIANG, JZY JOFFEMINOR, T JOHNS, K JOHNSON, M JOHNSTAD, H JONCKHEERE, A JONES, M JOSTLEIN, H JUNG, CK KAHN, S KEHOE, R KELLY, M KERNAN, A KERTH, L KHOLODENKO, A KIRYUNIN, A KISTENEV, E KLATCHKO, A KLIMA, B KLOCHKOV, B KLOPFENSTEIN, C KLYUKHIN, V KOCHETKOV, V KOHLI, JM KOLTICK, D KOTCHER, J KOTOV, I KOURLAS, J KOZELOV, A KOZLOVSKY, E KRISHNASWAMY, MR KRZYWDZINSKI, S KUNORI, S LAMI, S LANDSBERG, G LANOU, RE LEEFRANZINI, J LI, H LI, J LI, RB LIDEMARTEAU, QZ LIMA, JGR LINN, SL LINNEMANN, J LIPTON, R LIU, YC LOBKOWICZ, F LOCH, P LOKEN, SC LOKOS, S LUEKING, L MACIEL, AKA MADARAS, RJ MADDEN, R MANGEOT, P MANNING, I MANSOULIE, B MAO, HS MARGULIES, S MARKELOFF, R MARKOSKY, L MARSHALL, T MARTIN, HJ MARTIN, MI MARTIN, PS MARX, M MAY, B MAYOROV, A MCCARTHY, R MCKIBBEN, T MCKINLEY, J MENG, XC MERRITT, KW MIETTINEN, H MILDER, A MILNER, C MINCER, A MONDAL, NK MONTGOMERY, HE MOONEY, P MUDAN, M MURPHY, C MURPHY, CT NANG, F NARAIN, M NARASIMHAM, VS NEAL, HA NEGRET, JP NEMETHY, P NESIC, D NORMAN, D OESCH, L OGURI, V OLTMAN, E OSHIMA, N OWEN, D PANG, M PARA, A PARK, CH PARTRIDGE, R PATERNO, M PERYSHKIN, A PETERS, M PI, B PIEKARZ, H PISCHALNIKOV, Y PIZZUTO, D PLUQUET, A PODSTAVKOV, V POPE, BG PROSPER, HB PROTOPOPESCU, S QUE, YK QUINTAS, PZ RAHALCALLOT, G RAJA, R RAJAGOPALAN, S RAO, MVS RASMUSSEN, L READ, AL REPOND, S REUCROFT, S RIADOVIKOV, V RIJSSENBEEK, M ROE, NA RUBINOV, P RUCHTI, R RUTHERFOORD, J SANTORO, A SAWYER, L SCHAMBERGER, RD SCHMID, D SCULLI, J SHKURENKOV, A SHUPE, M SINGH, JB SIROTENKO, V SKEENS, J SMART, W SMITH, A SMITH, D SMITH, RP SNOW, GR SNYDER, S SOLOMON, J SOOD, PM SOSEBEE, M SOUZA, M SPADAFORA, AL STEPHENS, R STEVENSON, ML STEWART, D STOCKER, F STOYANOVA, D STREETS, K STROVINK, M SUHANOV, A TAKETANI, A TARTAGLIA, M TEIGER, J THOMPSON, J TRIPPE, TG TUTS, PM VISHWANATH, PR VOLKOV, A VOROBIEV, A WAHL, HD WANG, DC WANG, LZ WARCHOL, J WAYNE, M WEERTS, H WENZEL, WA WHITE, A WHITE, JT WIGHTMAN, JA WILCOX, J WILLIS, S WIMPENNY, SJ WOLF, Z WOMERSLEY, J WOOD, DR XIA, Y XIAO, D XIE, PP XU, H YAMADA, R YAMIN, P YANAGISAWA, C YANG, J YANG, MJ YASUDA, T YOSHIKAWA, C YOUSSEF, S YU, J ZEITNITZ, C ZHANG, S ZHOU, YH ZHU, Q ZHU, YS ZIEMINSKA, D ZIEMINSKI, A ZINCHENKO, A ZYLBERSTEIN, A AF ABACHI, S ABBOTT, B ABOLINS, M ACHARYA, BS ADAM, I ADAMS, DL ADAMS, M AHN, S AIHARA, H ALVAREZ, G ALVES, GA AMOS, N ANDERSON, EW ANTIPOV, Y ARONSON, SH ASTUR, R AVERY, RE BADEN, A BALAMURALI, V BALDERSTON, J BALDIN, B BANTLY, J BARTLETT, JF BAZIZI, K BEHNKE, T BENDICH, J BERI, SB BEZZUBOV, V BHAT, PC BHATNAGAR, V BISWAS, N BLAZEY, G BLESSING, S BOEHNLEIN, A BORCHERDING, F BORDERS, J BOZKO, N BRANDT, A BROCK, R BROSS, A BUCHHOLZ, D BURTOVOI, V BUTLER, JM CALLOT, OH CASTILLAVALDEZ, H CHAKRABORTY, D CHEKULAEV, S CHEN, J CHEN, LP CHEN, W 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, M CUSSONNEAU, JP CUTTS, D DAHL, OI DE, K DEMARTEAU, M DEMINA, R DENISENKO, K DENISENKO, N DENISOV, D DENISOV, S DHARMARATNA, W DIEHL, HT DIESBURG, M DIXON, R DRAPER, P DUCROS, Y DURSTONJOHNSON, S EARTLY, D EDMUNDS, D EFIMOV, A ELLISON, J ELVIRA, VD ENGELMANN, R EPPLEY, G EROSHIN, O EVDOKIMOV, V FAHEY, S FANOURAKIS, G FATYGA, M FATYGA, MK FEATHERLY, J FEHER, S FEIN, D FERBEL, T FINOCCHIARO, G FISK, HE FLATTUM, E FORDEN, GE FORTNER, M FRANZINI, P FREDERIKSEN, S FUESS, S GAO, CS GELD, TL GENSER, K GERBER, CE GIBBARD, B GLEBOV, V GLICENSTEIN, JF GOBBI, B GOFORTH, M GOLDSCHMIDT, A GOMEZ, B GOOD, ML GORDON, H GRAF, N GRANNIS, PD GREEN, DR GREEN, J GREENLEE, H GROSSMAN, N GRUDBERG, P GRUNENDAHL, S GUIDA, JA GUIDA, JM GURYN, W HADLEY, NJ HAGGERTY, H HAGOPIAN, S HAGOPIAN, V HALL, RE HANSEN, S HAUPTMAN, JM HEDIN, D HEINSON, AP HEINTZ, U HERRERACORRAL, G HEURING, T HIROSKY, R HOENEISEN, B HOFTUN, JS HU, T HUBBARD, JR HUEHN, T IGARASHI, S ITO, AS JAMES, E JAQUES, J JIANG, JZY JOFFEMINOR, T JOHNS, K JOHNSON, M JOHNSTAD, H JONCKHEERE, A JONES, M JOSTLEIN, H JUNG, CK KAHN, S KEHOE, R KELLY, M KERNAN, A KERTH, L KHOLODENKO, A KIRYUNIN, A KISTENEV, E KLATCHKO, A KLIMA, B KLOCHKOV, B KLOPFENSTEIN, C KLYUKHIN, V KOCHETKOV, V KOHLI, JM KOLTICK, D KOTCHER, J KOTOV, I KOURLAS, J KOZELOV, A KOZLOVSKY, E KRISHNASWAMY, MR KRZYWDZINSKI, S KUNORI, S LAMI, S LANDSBERG, G LANOU, RE LEEFRANZINI, J LI, H LI, J LI, RB LIDEMARTEAU, QZ LIMA, JGR LINN, SL LINNEMANN, J LIPTON, R LIU, YC LOBKOWICZ, F LOCH, P LOKEN, SC LOKOS, S LUEKING, L MACIEL, AKA MADARAS, RJ MADDEN, R MANGEOT, P MANNING, I MANSOULIE, B MAO, HS MARGULIES, S MARKELOFF, R MARKOSKY, L MARSHALL, T MARTIN, HJ MARTIN, MI MARTIN, PS MARX, M MAY, B MAYOROV, A MCCARTHY, R MCKIBBEN, T MCKINLEY, J MENG, XC MERRITT, KW MIETTINEN, H MILDER, A MILNER, C MINCER, A MONDAL, NK MONTGOMERY, HE MOONEY, P MUDAN, M MURPHY, C MURPHY, CT NANG, F NARAIN, M NARASIMHAM, VS NEAL, HA NEGRET, JP NEMETHY, P NESIC, D NORMAN, D OESCH, L OGURI, V OLTMAN, E OSHIMA, N OWEN, D PANG, M PARA, A PARK, CH PARTRIDGE, R PATERNO, M PERYSHKIN, A PETERS, M PI, B PIEKARZ, H PISCHALNIKOV, Y PIZZUTO, D PLUQUET, A PODSTAVKOV, V POPE, BG PROSPER, HB PROTOPOPESCU, S QUE, YK QUINTAS, PZ RAHALCALLOT, G RAJA, R RAJAGOPALAN, S RAO, MVS RASMUSSEN, L READ, AL REPOND, S REUCROFT, S RIADOVIKOV, V RIJSSENBEEK, M ROE, NA RUBINOV, P RUCHTI, R RUTHERFOORD, J SANTORO, A SAWYER, L SCHAMBERGER, RD SCHMID, D SCULLI, J SHKURENKOV, A SHUPE, M SINGH, JB SIROTENKO, V SKEENS, J SMART, W SMITH, A SMITH, D SMITH, RP SNOW, GR SNYDER, S SOLOMON, J SOOD, PM SOSEBEE, M SOUZA, M SPADAFORA, AL STEPHENS, R STEVENSON, ML STEWART, D STOCKER, F STOYANOVA, D STREETS, K STROVINK, M SUHANOV, A TAKETANI, A TARTAGLIA, M TEIGER, J THOMPSON, J TRIPPE, TG TUTS, PM VISHWANATH, PR VOLKOV, A VOROBIEV, A WAHL, HD WANG, DC WANG, LZ WARCHOL, J WAYNE, M WEERTS, H WENZEL, WA WHITE, A WHITE, JT WIGHTMAN, JA WILCOX, J WILLIS, S WIMPENNY, SJ WOLF, Z WOMERSLEY, J WOOD, DR XIA, Y XIAO, D XIE, PP XU, H YAMADA, R YAMIN, P YANAGISAWA, C YANG, J YANG, MJ YASUDA, T YOSHIKAWA, C YOUSSEF, S YU, J ZEITNITZ, C ZHANG, S ZHOU, YH ZHU, Q ZHU, YS ZIEMINSKA, D ZIEMINSKI, A ZINCHENKO, A ZYLBERSTEIN, A TI RAPIDITY GAPS BETWEEN JETS IN P(P)OVER-BAR COLLISIONS AT ROOT-S=1.8 TEV SO PHYSICAL REVIEW LETTERS LA English DT Article AB First experimental results are presented from a search for events with a rapidity gap between jets. The DO detector was used to examine events produced by the Fermilab Tevatron ppBAR collider at square-root s = 1.8 TeV. The fraction of events with an observed rapidity gap between the two highest transverse energy (E(T)) jets is measured as a function of the pseudorapidity separation between the jet edges (DELTAeta(c)). An upper limit at the 95% confidence level of 1.1 X 10(-2) is obtained on the fraction of events with no particles between the jets, for events with DELTAeta(c) > 3 and jet E(T) greater than 30 GeV. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. FLORIDA STATE UNIV,TALLAHASSEE,FL 32306. UNIV HAWAII,HONOLULU,HI 96822. INDIANA UNIV,BLOOMINGTON,IN 47401. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. UNIV MARYLAND,COLL PK,MD 20742. MICHIGAN STATE UNIV,E LANSING,MI 48824. NO ILLINOIS UNIV,DE KALB,IL 60115. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14627. SUNY STONY BROOK,STONY BROOK,NY 11794. TATA INST FUNDAMENTAL RES,BOMBAY 400005,INDIA. UNIV LOS ANDES,BOGOTA,COLOMBIA. UNIV ARIZONA,TUCSON,AZ 85721. UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521. COLUMBIA UNIV,NEW YORK,NY 10027. BROWN UNIV,PROVIDENCE,RI 02912. UNIV FLORIDA,GAINESVILLE,FL 32611. UNIV ILLINOIS,CHICAGO,IL 60680. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV MICHIGAN,ANN ARBOR,MI 48109. NYU,NEW YORK,NY 10003. NORTHEASTERN UNIV,BOSTON,MA 02115. UNIV NOTRE DAME,NOTRE DAME,IN 46556. PANJAB UNIV,CHANDIGARH 160014,INDIA. RICE UNIV,HOUSTON,TX 77251. TEXAS A&M UNIV,COLLEGE STN,TX 77843. UNIV TEXAS,ARLINGTON,TX 76019. LAFEX,CTR BRASILEIRO PESQUISAS FIS,RIO JANEIRO,BRAZIL. CINVESTAV IPN,MEXICO CITY,MEXICO. NORTHWESTERN UNIV,EVANSTON,IL 60208. PROTVINO HIGH ENERGY PHYS INST,142284 PROTVINO,RUSSIA. CE SACLAY,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. SSC LAB,DALLAS,TX 75237. RP ABACHI, S (reprint author), FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. RI Oguri, Vitor/B-5403-2013; Alves, Gilvan/C-4007-2013; Chekulaev, Sergey/O-1145-2015; Taketani, Atsushi/E-1803-2017; Aihara, Hiroaki/F-3854-2010; Klyukhin, Vyacheslav/D-6850-2012; De, Kaushik/N-1953-2013 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 NR 12 TC 77 Z9 77 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 11 PY 1994 VL 72 IS 15 BP 2332 EP 2336 DI 10.1103/PhysRevLett.72.2332 PG 5 WC Physics, Multidisciplinary SC Physics GA NE851 UT WOS:A1994NE85100006 ER PT J AU ADAMS, D AHMAD, S AKCHURIN, N BIRMINGHAM, P BREUER, H CHANG, CC CIHANGIR, S CORCORAN, MD DAVIS, WL GUSTAFSON, HR HOLMGREN, H KASPER, P KRUK, J LINCOLN, D LONGO, MJ MARRAFFINO, J MCPHERSON, J MIETTINEN, HE MORROW, G MUTCHLER, GS NAPLES, D ONEL, Y SKEENS, J THOMAS, GP TRAYNOR, MM WATERS, JW WEBSTER, MS XU, JP ZHU, Q AF ADAMS, D AHMAD, S AKCHURIN, N BIRMINGHAM, P BREUER, H CHANG, CC CIHANGIR, S CORCORAN, MD DAVIS, WL GUSTAFSON, HR HOLMGREN, H KASPER, P KRUK, J LINCOLN, D LONGO, MJ MARRAFFINO, J MCPHERSON, J MIETTINEN, HE MORROW, G MUTCHLER, GS NAPLES, D ONEL, Y SKEENS, J THOMAS, GP TRAYNOR, MM WATERS, JW WEBSTER, MS XU, JP ZHU, Q TI OBSERVATION OF JET PRODUCTION BY REAL PHOTONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID INELASTIC COMPTON-SCATTERING; DIJET CROSS-SECTION; LUND MONTE-CARLO; E+E ANNIHILATION; FRAGMENTATION; ENERGY; PHOTOPRODUCTION; COLLISIONS; PHYSICS; QCD AB Interactions of high energy photons on a hydrogen target have been studied using a large acceptance segmented calorimeter. The event topology clearly shows the production of dijet final states as predicted by perturbative QCD. The energy flow in the photon (forward) direction is compared to Monte Carlo expectations and to that produced in pip interactions. C1 BALL STATE UNIV,MUNCIE,IN 47306. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV IOWA,IOWA CITY,IA 52242. UNIV MARYLAND,COLL PK,MD 20742. UNIV MICHIGAN,ANN ARBOR,MI 48109. VANDERBILT UNIV,NASHVILLE,TN 37240. RP ADAMS, D (reprint author), RICE UNIV,HOUSTON,TX 77005, USA. RI Kruk, Jeffrey/G-4047-2012 NR 35 TC 6 Z9 6 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 11 PY 1994 VL 72 IS 15 BP 2337 EP 2340 DI 10.1103/PhysRevLett.72.2337 PG 4 WC Physics, Multidisciplinary SC Physics GA NE851 UT WOS:A1994NE85100007 ER PT J AU NAPLES, D AKCHURIN, N BIRMINGHAM, P BREUER, H CHANG, CC CIHANGIR, S CORCORAN, MD DAVIS, WL GUSTAFSON, HR HOLMGREN, H KASPER, P LINCOLN, D LONGO, MJ MARRAFFINO, J MCPHERSON, J MIETTINEN, HE MORROW, G MUTCHLER, GS ONEL, Y THOMAS, GP TRAYNOR, MM WATERS, JW WEBSTER, MS XU, JP ZHU, Q AF NAPLES, D AKCHURIN, N BIRMINGHAM, P BREUER, H CHANG, CC CIHANGIR, S CORCORAN, MD DAVIS, WL GUSTAFSON, HR HOLMGREN, H KASPER, P LINCOLN, D LONGO, MJ MARRAFFINO, J MCPHERSON, J MIETTINEN, HE MORROW, G MUTCHLER, GS ONEL, Y THOMAS, GP TRAYNOR, MM WATERS, JW WEBSTER, MS XU, JP ZHU, Q TI A DEPENDENCE OF PHOTOPRODUCED DIJETS SO PHYSICAL REVIEW LETTERS LA English DT Article ID LARGE TRANSVERSE-MOMENTUM; MONTE-CARLO; NUCLEUS COLLISIONS; ENERGY; SCATTERING; QCD AB We present a measurement of the A dependence of k(T)phi, the out-of-plane component of the dijet transverse momentum, in dijet events produced with a real photon beam. We also present the same measurement for dijets produced from pion-nucleus collisions in our detector. Both data sets are taken at a mean square-root s of 21 GeV in the p(T) range 3-7 GeV/c. A clear A dependence of comparable magnitude is seen in both processes. The energy dependence of the nuclear behavior is also extracted. C1 BALL STATE UNIV,MUNCIE,IN 47306. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV IOWA,IOWA CITY,IA 52242. VANDERBILT UNIV,NASHVILLE,TN 37240. RICE UNIV,HOUSTON,TX 77251. RP NAPLES, D (reprint author), UNIV MARYLAND,COLL PK,MD 20742, USA. NR 25 TC 21 Z9 21 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 11 PY 1994 VL 72 IS 15 BP 2341 EP 2344 DI 10.1103/PhysRevLett.72.2341 PG 4 WC Physics, Multidisciplinary SC Physics GA NE851 UT WOS:A1994NE85100008 ER PT J AU ZHENG, JF WALKER, JD SALMERON, MB WEBER, ER AF ZHENG, JF WALKER, JD SALMERON, MB WEBER, ER TI INTERFACE SEGREGATION AND CLUSTERING IN STRAINED-LAYER INGAAS/GAAS HETEROSTRUCTURES STUDIES BY CROSS-SECTIONAL SCANNING-TUNNELING-MICROSCOPY SO PHYSICAL REVIEW LETTERS LA English DT Article ID SEMICONDUCTOR INTERFACES; SURFACE AB Interface roughness due to segregation and clustering has been studied in atomic detail for the first time, using a cross-sectional scanning tunneling microscope and its spectroscopic ability to distinguish In and Ga atoms in GaAs/In0.2Ga0.8As/GaAs strained layers. In the In0.2Ga0.8As layers, InAs is found to cluster preferentially along the growth direction with each cluster containing 2-3 indium atoms. Indium segregation induced an asymmetrical interface broadening. The interface of GaAs as grown on In0.2Ga0.8As is found to be broadened to about 5-10 atomic layers, while that of InGaAs on GaAs is about 2-4 layers broad. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT ELECT ENGN & COMP SCI,BERKELEY,CA 94720. RP ZHENG, JF (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI,BERKELEY,CA 94720, USA. NR 20 TC 116 Z9 116 U1 0 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 APR 11 PY 1994 VL 72 IS 15 BP 2414 EP 2417 DI 10.1103/PhysRevLett.72.2414 PG 4 WC Physics, Multidisciplinary SC Physics GA NE851 UT WOS:A1994NE85100027 ER PT J AU HUANG, KG ZEGENHAGEN, J PHILLIPS, JM PATEL, JR AF HUANG, KG ZEGENHAGEN, J PHILLIPS, JM PATEL, JR TI 2-DIMENSIONAL STRUCTURAL MODULATION IN EPITAXIAL CAF2 OVERLAYERS ON SI(111) SO PHYSICAL REVIEW LETTERS LA English DT Article ID X-RAY-SCATTERING; CAF2/SI(111) INTERFACE; AU(111) SURFACE; DISCOMMENSURATIONS; HETEROEPITAXY; TRANSITIONS; MONOLAYER; BEHAVIOR; PHASES; GROWTH AB Using high-resolution x-ray diffraction a CaF2 thin film epitaxially grown on Si(111) is found to exhibit an incommensurately modulated structure parallel to the interface. The overlayer consists of a triangular network of discommensurations, separating regions with two different site occupations of the interfacial Ca, H3 and T4. The 2D spatial modulation in CaF2 is induced by the competition between the strong interfacial bonding and the bonding in the film. Remarkably, the in-plane lattice distortion generated at the interface propagates many atomic layers through the CaF2 film. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. MAX PLANCK INST FESTKORPERFORSCH,W-7000 STUTTGART 1,GERMANY. AT&T BELL LABS,MURRAY HILL,NJ 07974. RP HUANG, KG (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 26 TC 26 Z9 26 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 11 PY 1994 VL 72 IS 15 BP 2430 EP 2433 DI 10.1103/PhysRevLett.72.2430 PG 4 WC Physics, Multidisciplinary SC Physics GA NE851 UT WOS:A1994NE85100031 ER PT J AU SINGH, PP AF SINGH, PP TI FROM HEXAGONAL CLOSE-PACKED TO RHOMBOHEDRAL STRUCTURE - RELATIVISTIC EFFECTS IN ZN, CD, AND HG SO PHYSICAL REVIEW LETTERS LA English DT Article ID BINDING AB We study the effects of relativity on the stability of group II elements Zn, Cd, and Hg in face-centered cubic (fcc) and hexagonal close-packed (hcp) structures. A comparison of nonrelativistic and scalar-relativistic results for both the fcc and the hcp phases of these elements, obtained self-consistently, clearly shows that the change in the most stable crystal structure from the hcp to the fcc-like rhombohedral, as one goes from Zn to Hg, is due to relativity. The stability of different structures is explained in terms of the increase in s-p hybridization resulting from relativity. RP SINGH, PP (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,L-268,LIVERMORE,CA 94550, USA. NR 15 TC 22 Z9 23 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 APR 11 PY 1994 VL 72 IS 15 BP 2446 EP 2449 DI 10.1103/PhysRevLett.72.2446 PG 4 WC Physics, Multidisciplinary SC Physics GA NE851 UT WOS:A1994NE85100035 ER PT J AU WANG, ZQ LEE, DH WEN, XG AF WANG, ZQ LEE, DH WEN, XG TI TRANSITIONS BETWEEN HALL PLATEAUS IN THE PRESENCE OF STRONG LANDAU-LEVEL MIXING SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUANTUM SPIN CHAINS; STRONG MAGNETIC-FIELD; DELOCALIZATION; LOCALIZATION; THETA=PI; STATES; MODELS AB We study the effects of Landau level mixing on the critical properties of plateau transitions in the quantum Hall effect. Combining numerical results with analytical arguments, we conclude that for noninteracting electrons the universality class of the plateau transition is unchanged in the presence of a strong Landau level mixing. C1 MIT,DEPT PHYS,CAMBRIDGE,MA 02139. LOS ALAMOS NATL LAB,DIV THEORET T-11,LOS ALAMOS,NM 87545. BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215. IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598. UNIV CALIF BERKELEY,BERKELEY,CA 94720. RP WANG, ZQ (reprint author), LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545, USA. NR 25 TC 47 Z9 47 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 11 PY 1994 VL 72 IS 15 BP 2454 EP 2457 DI 10.1103/PhysRevLett.72.2454 PG 4 WC Physics, Multidisciplinary SC Physics GA NE851 UT WOS:A1994NE85100037 ER PT J AU COOPER, F DAWSON, J SHEPARD, H AF COOPER, F DAWSON, J SHEPARD, H TI SUSY-BASED VARIATIONAL METHOD FOR THE ANHARMONIC-OSCILLATOR SO PHYSICS LETTERS A LA English DT Article ID SCHRODINGER-EQUATION; SUPERSYMMETRY AB Using a newly suggested algorithm of Gozzi, Reuter and Thacker for calculating the excited states of one-dimensional systems, we determine approximately the eigenvalues and eigenfunctions of the anharmonic oscillator, described by the Hamiltonian H = 1/2p2+gx4. We use ground state post-Gaussian trial wave functions of the form PSI(x) = N exp(-b\x\2n), where n and b are continuous variational parameters. This algorithm is based on the hierarchy of Hamiltonians related by supersymmetry (SUSY) and the factorization method. We find that our two-parameter family of trial wave functions yields excellent energy eigenvalues and wave functions for the first few levels of the anharmonic oscillator. C1 UNIV NEW HAMPSHIRE,DEPT PHYS,DURHAM,NH 03824. RP COOPER, F (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 12 TC 19 Z9 19 U1 0 U2 1 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 APR 11 PY 1994 VL 187 IS 2 BP 140 EP 144 DI 10.1016/0375-9601(94)90051-5 PG 5 WC Physics, Multidisciplinary SC Physics GA NF464 UT WOS:A1994NF46400002 ER PT J AU GUREVICH, AV MILIKH, GM ROUSSELDUPRE, RA AF GUREVICH, AV MILIKH, GM ROUSSELDUPRE, RA TI NONUNIFORM RUNAWAY AIR-BREAKDOWN SO PHYSICS LETTERS A LA English DT Article AB The spatial structure of an individual runaway breakdown pulse, stimulated by a seed energetic electron, is determined. C1 UNIV MARYLAND,DEPT ASTRON,COLLEGE PK,MD 20742. LOS ALAMOS NATL LAB,DIV SPACE SCI & TECHNOL,LOS ALAMOS,NM 87545. RP GUREVICH, AV (reprint author), MAX PLANCK INST AERON,W-3411 KATLENBURG DUHM,GERMANY. RI Gurevich, Aleksandr/K-8668-2015 OI Gurevich, Aleksandr/0000-0003-1125-9774 NR 4 TC 43 Z9 44 U1 0 U2 1 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 APR 11 PY 1994 VL 187 IS 2 BP 197 EP 203 DI 10.1016/0375-9601(94)90062-0 PG 7 WC Physics, Multidisciplinary SC Physics GA NF464 UT WOS:A1994NF46400013 ER PT J AU FRY, JN GAZTANAGA, E AF FRY, JN GAZTANAGA, E TI REDSHIFT DISTORTIONS OF GALAXY CORRELATION-FUNCTIONS SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, CLUSTERING; GALAXIES, DISTANCES AND REDSHIFTS; LARGE-SCALE STRUCTURE OF UNIVERSE; METHODS, NUMERICAL ID POINT CORRELATION-FUNCTIONS; LARGE-SCALE STRUCTURE; IRAS GALAXIES; STATISTICAL-ANALYSIS; FLUCTUATIONS; EVOLUTION; CATALOGS; SKEWNESS; 2-POINT; OBJECTS AB To examine how peculiar velocities can affect the two-, three-, and four-point redshift correlation functions, we evaluate volume-average correlations for configurations that emphasize and minimize redshift distortions for four different volume-limited samples from each of the CfA, SSRS, and IRAS redshift catalogs. We present the results as the correlation length r0 and power index gamma of the two-point correlations, xiBAR0 = (r0/r)gamma, and as the hierarchical amplitudes of the three- and four-point functions, S3 = xiBAR3/xiBAR2(2) and S4 = xiBAR4/xiBAR2(3). We find a characteristic distortion for xiBAR2; the slope gamma is flatter and the correlation length is larger in redshift space than in real space; that is, redshift distortions ''move'' correlations from small to large scales. At the largest scales (up to 12 Mpc), the extra power in the redshift distribution is compatible with OMEGA4/7/b almost-equal-to 1. We estimate OMEGA4/7/b to be 0.53 +/- 0.15, 1.10 +/- 0.16, and 0.84 +/- 0.45 for the CfA, SSRS, and IRAS catalogs. Higher order correlations xiBAR3 and xiBAR4 suffer similar redshift distortions but in such a way that, within the accuracy of our analysis, the normalized amplitudes S3 and S4 are insensitive to this effect. The hierarchical amplitudes S3 and S4 are constant as a function of scale between 1 and 12 Mpc and have similar values in all samples and catalogs, S3 almost-equal-to 2 and S4 almost-equal-to 6, despite the fact that xiBAR2, xiBAR3, and xiBAR4 differ from one sample to another by large factors (up to a factor of 4 in xiBAR2, 8 for xiBAR3, and 12 for xiBAR4). The agreement between the independent estimations of S3 and S4 is remarkable given the different criteria in the selection of galaxies and also the difference in the resulting range of densities, luminosities, and locations between samples. C1 UNIV FLORIDA,DEPT PHYS,GAINESVILLE,FL 32611. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. RP FRY, JN (reprint author), FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510, USA. OI Gaztanaga, Enrique/0000-0001-9632-0815 NR 27 TC 42 Z9 42 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 APR 10 PY 1994 VL 425 IS 1 BP 1 EP 13 DI 10.1086/173956 PN 1 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NE028 UT WOS:A1994NE02800001 ER PT J AU SWENSON, FJ FAULKNER, J ROGERS, FJ IGLESIAS, CA AF SWENSON, FJ FAULKNER, J ROGERS, FJ IGLESIAS, CA TI THE HYADES LITHIUM PROBLEM REVISITED SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC DATA; OPEN CLUSTERS AND ASSOCIATIONS, INDIVIDUAL (HYADES); STARS, ABUNDANCES; STARS, INTERIORS; SUN, ABUNDANCES ID HIGH-RESOLUTION SPECTROSCOPY; MAIN-SEQUENCE STARS; CHEMICAL-COMPOSITION; SOLAR MODELS; STELLAR ENVELOPES; OPACITY TABLES; OPEN CLUSTERS; FE-I; ABUNDANCE; EVOLUTION AB Swenson, Stringfellow, & Faulkner (1990a) suggested that long-standing deficiencies in interior opacities could be responsible for an underestimation of pre-main-sequence (PMS) lithium depletion in stellar models. They showed that models with increased interior opacities could produce excellent theoretical agreement with the pattern of depletion observed in the Hyades G dwarfs. Preliminary opacities for appropriate conditions then computed with the OPAL code were found to be consistent with the kind of opacity increments Swenson et al. had suggested. We now explore the self-consistent consequences of more complete opacity tables and several other physical improvements in both solar and Hyades models. We examine their impact on PMS lithium depletion, the depth of the solar convective zone, and the deduced helium abundances for the Sun and Hyades (the latter involving an appeal to the observed Hyades mass-luminosity relationship). Adopted improvements are (1) OPAL interior opacities (with solar photospheric or meteoritic iron abundances), (2) new surface opacities (Alexander 1992), (3) calibrated parameters (from Proffitt & Michaud 1991a) for the pressure ionization prescription of the EFF (Eggleton, Faulkner, & Flannery 1973) equation of state, and (4) electrostatic corrections to the equation of state. (1) and (3) significantly increase depletion while (2) significantly decreases the depletion. While the ''best'' models deplete substantially more lithium than our early models, they do not deplete quite enough to fit the observed pattern. (A notable ''peculiarity'' of the ''best'' self-consistent models so produced is that the deduced Hyades helium mass fraction falls short of the solar model value by approximately 0.02.) Finally, we explore a number of separate, additional possible changes that could produce an excellent self-consistent fit to both the Hyades lithium depletion pattern and the observed mass-luminosity relationship. Three such changes are: (i) an increase in opacity of approximately 14% in the 1-4 million degree range (which also produces a solar model with the correct convective depth as determined from oscillations); (ii) an increase in [Fe/H]Hyades from 0.13 to approximately 0.27 (which also increases the deduced helium content of the Hyades to slightly more than the solar value); (iii) a modest amount of convective overshooting, by approximately 0.08 of a pressure scale height, H(p). Since some earlier, studies required overshooting by approximately 0.7H(p) to roughly fit the observed lithium depletion (while failing to fit it in detail), our third alternative ''tune-up'' emphasizes how much of the older discrepancies, both quantitative and qualitative, have been removed by the opacities and physical improvements now incorporated into the ''best'' current models. C1 UNIV CALIF SANTA CRUZ,LICK OBSERV,BOARD STUDIES ASTRON & ASTROPHYS,SANTA CRUZ,CA 95064. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP SWENSON, FJ (reprint author), UNIV VICTORIA,DEPT PHYS & ASTRON,POB 3055,VICTORIA V8W 3P6,BC,CANADA. NR 67 TC 125 Z9 125 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 APR 10 PY 1994 VL 425 IS 1 BP 286 EP 302 DI 10.1086/173985 PN 1 PG 17 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NE028 UT WOS:A1994NE02800030 ER PT J AU DEFONTAINE, M AF DEFONTAINE, M TI SIGN OF THE EFFECTIVE O-CU-O INTERACTION ALONG CHAINS IN YBA2CU3O6+X - REPLY SO EUROPHYSICS LETTERS LA English DT Article ID OFF-STOICHIOMETRIC YBA2CU3OZ; OXYGEN; TC C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP DEFONTAINE, M (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. NR 10 TC 4 Z9 4 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 APR 10 PY 1994 VL 26 IS 2 BP 155 EP 156 PG 2 WC Physics, Multidisciplinary SC Physics GA NJ075 UT WOS:A1994NJ07500014 ER PT J AU HARTSE, HE FEHLER, MC ASTER, RC SCOTT, JS VERNON, FL AF HARTSE, HE FEHLER, MC ASTER, RC SCOTT, JS VERNON, FL TI SMALL-SCALE STRESS HETEROGENEITY IN THE ANZA SEISMIC GAP, SOUTHERN CALIFORNIA SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID JACINTO FAULT ZONE; STRIKE-SLIP FAULTS; SAN-ANDREAS FAULT; FOCAL MECHANISM DATA; HEAT-FLOW; SOURCE PARAMETERS; EARTHQUAKE; TENSOR; STRAIN; POPULATION AB Focal mechanism inversions reveal significant lateral variations in stress orientations along the Anza segment of the San Jacinto fault zone. The most notable stress anomaly is within the 20-km aseismic (seismic gap) portion of the fault zone, where sigma1, the maximum compressive stress, is nearly horizontal and is oriented at 74-degrees +/- 13-degrees relative to the fault strike. This contrasts with orientations ranging from 62-degrees +/- 11-degrees to 49-degrees +/- 7-degrees along the more seismically active portions of the fault zone immediately to the northwest and southeast of the seismic gap. Regional stress results, found by inverting all focal mechanisms simultaneously, indicate that sigma1 is horizontal and trends north-south, while sigma3 is horizontal and trends east-west. Approximately, 15 km west of the seismic gap, in the off-fault Cahuilla swarm area, sigma1 and sigma3 solutions are rotated clockwise by about 25-degrees relative to the regional model. Roughly, 10 km southeast of the seismic gap near the Buck Ridge fault, sigma1 and sigma3 are rotated counterclockwise by about 10-degrees relative to the regional solution. Northwest of the seismic gap along the fault zone, sigma3 plunges about 30-degrees from the horizontal, correlating with a local increase in reverse faulting between the Hot Springs and San Jacinto faults. Southeast of the seismic gap, sigma1 plunges about 45-degrees from the horizontal, correlating with a local increase in normal faulting in the trifurcation region of the Buck Ridge, Clark, and Coyote Creek faults. We propose a simple mechanical model in which a block rotation superimposed on the dominant right-lateral strike-slip motion of the fault zone satisfies the first-order observations of stress orientation, faulting, and horizontal surface strain. Under this model the Anza seismic gap is the region of zero convergence between the northeast and southwest sides of the fault, and the fault zone strength within the seismic gap is either comparable to or exceeds the fault zone strength adjacent to the gap. C1 NEW MEXICO INST MIN & TECHNOL, DEPT GEOSCI, SOCORRO, NM 87801 USA. UNIV CALIF SAN DIEGO, SCRIPPS INST OCEANOG, INST PHYS & PLANETARY PHYS, LA JOLLA, CA 92093 USA. NEW MEXICO INST MIN & TECHNOL, GEOPHYS RES CTR, SOCORRO, NM 87801 USA. RP HARTSE, HE (reprint author), LOS ALAMOS NATL LAB, GEOENGN GRP, MAIL STOP D443, LOS ALAMOS, NM 87545 USA. RI Aster, Richard/E-5067-2013 OI Aster, Richard/0000-0002-0821-4906 NR 51 TC 20 Z9 20 U1 0 U2 2 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 APR 10 PY 1994 VL 99 IS B4 BP 6801 EP 6818 DI 10.1029/93JB02874 PG 18 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NF970 UT WOS:A1994NF97000008 ER PT J AU STECK, LK PROTHERO, WA AF STECK, LK PROTHERO, WA TI CRUSTAL STRUCTURE BENEATH LONG VALLEY CALDERA FROM MODELING OF TELESEISMIC P-WAVE POLARIZATIONS AND PS CONVERTED WAVES SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID LOW-VELOCITY ZONE; CALIFORNIA; ROCKS AB In this study we present new constraints on the nature of the low-velocity zone beneath Long Valley caldera, based on the measured propagation directions of teleseismic P waves and on modeling of P to S converted waves. The low-velocity body is a large asymmetrical volume which deepens to the east, extending from depths of 7 to 30 km. It contains lower velocities than originally proposed by earlier teleseismic studies. In particular, there is a tabular feature between 7 and 11 km depth that has a reduction in velocity of about 30%. These low velocities imply a much greater percentage of melt in the crust beneath Long Valley caldera than previously estimated. Array analysis of large delayed arrivals identifies them to be Ps converted waves from the shoulders and roof of this tabular zone. These conversions bound the depth to the magma chamber roof to be within about 10 km of the surface. Our results are consistent with elements from several other studies, and we present an integrated and improved model of crustal structure at Long Valley. The concordance of the deeper low-velocity zones with regional structural trends implies that the shallow low-velocity feature is a cupola on top of an asymmetric diapiric ridge rising up from the migmatized lower crust of the Basin and Range. We present two contrasting interpretations of the geometry of low-velocity zones in the crust: one implies a time-invariant magma chamber and conduit system for Long Valley caldera, the other implies an evolution of that system from a simple vertical regime to its current asymmetrical geometry. C1 UNIV CALIF SANTA BARBARA, DEPT GEOL SCI, SANTA BARBARA, CA 93106 USA. RP STECK, LK (reprint author), LOS ALAMOS NATL LAB, EES-4, MAIL STOP D443, LOS ALAMOS, NM 87545 USA. NR 37 TC 27 Z9 27 U1 0 U2 2 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 APR 10 PY 1994 VL 99 IS B4 BP 6881 EP 6898 DI 10.1029/93JB03284 PG 18 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NF970 UT WOS:A1994NF97000012 ER PT J AU BALTISBERGER, JH GANN, SL GRANDINETTI, PJ PINES, A AF BALTISBERGER, JH GANN, SL GRANDINETTI, PJ PINES, A TI CROSS-POLARIZATION DYNAMIC-ANGLE SPINNING NUCLEAR-MAGNETIC-RESONANCE OF QUADRUPOLAR NUCLEI SO MOLECULAR PHYSICS LA English DT Article ID PROTON-ENHANCED NMR; QUANTUM NMR; C-13 NMR; SOLIDS; SYSTEMS; PROBE AB The use of variable-angle spinning (VAS) with cross-polarization (CP) for quadrupolar nuclei has been evaluated both experimentally and theoretically. It is known that under normal spinning speeds the best VAS angle for performing CP is 0-degrees (parallel to the magnetic field). We show that, with the use of dynamic-angle spinning (DAS) probes, CP may be done at 0-degrees and detection in a one-dimensional VAS experiment may be performed at any angle in a zero-polarized VAS (ZPVAS) experiment. Finally, the combination of CP with k = 5 DAS (where the sample is spun first at 0-degrees followed by 63.43-degrees) provides both the highest resolution and the greatest sensitivity under normal conditions. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,BERKELEY,CA 94720. RI Grandinetti, Philip/F-1084-2010 OI Grandinetti, Philip/0000-0003-0102-316X NR 29 TC 27 Z9 27 U1 1 U2 7 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0026-8976 J9 MOL PHYS JI Mol. Phys. PD APR 10 PY 1994 VL 81 IS 5 BP 1109 EP 1124 DI 10.1080/00268979400100741 PG 16 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NE628 UT WOS:A1994NE62800007 ER PT J AU KLEHE, AK SCHILLING, JS WAGNER, JL HINKS, DG AF KLEHE, AK SCHILLING, JS WAGNER, JL HINKS, DG TI HYDROSTATIC-PRESSURE DEPENDENCE OF THE SUPERCONDUCTING TRANSITION-TEMPERATURE OF HGBA2CACU2O6+DELTA AND HGBA2CA2CU3O8+DELTA SO PHYSICA C LA English DT Article AB The dependence of the superconducting transition temperature T(c)(P) on purely hydrostatic pressure to 0.9 GPa has been determined in AC-susceptibility studies in a He-ps pressure system for optimally doped ceramic samples of HgBa2CaCu2O6+delta and HgBa2Ca2Cu3O8+delta with superconducting transitions at T(c)(0) congruent-to 126.6 K and 133.9 K respectively. T(c) increases reversibly under hydrostatic pressure at the rates, dT(c)/dP congruent-to + 1.80 +/- 0.06 K/GPa and + 1.71 +/- 0.05 K/GPa, respectively. Within experimental error, these values are the same as found previously for optimally doped single-layered HgBa2CuO4+delta, where dT(c)/dP congruent-to + 1.72 +/- 0.05 K/GPa. Remarkably, the logarithmic volume derivative of T(c) is nearly identical for all three compounds, dln T(c)/dln V congruent-to -1.20 +/- 0.05, even though the bulk modulus differs by more than 30%. This provides strong evidence that a common mechanism is responsible for the pressure dependence of the superconducting state in all three compounds. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439. RP KLEHE, AK (reprint author), WASHINGTON UNIV,DEPT PHYS,CAMPUS BOX 1105,1 BROOKINGS DR,ST LOUIS,MO 63130, USA. NR 24 TC 36 Z9 37 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 APR 10 PY 1994 VL 223 IS 3-4 BP 313 EP 320 DI 10.1016/0921-4534(94)91275-0 PG 8 WC Physics, Applied SC Physics GA NG476 UT WOS:A1994NG47600014 ER PT J AU BRADEN, M SCHWEISS, P HEGER, G REICHARDT, W FISK, Z GAMAYUNOV, K TANAKA, I KOJIMA, H AF BRADEN, M SCHWEISS, P HEGER, G REICHARDT, W FISK, Z GAMAYUNOV, K TANAKA, I KOJIMA, H TI RELATION BETWEEN STRUCTURE AND DOPING IN LA2-XSRXCUO4+DELTA - A NEUTRON-DIFFRACTION STUDY ON SINGLE-CRYSTALS SO PHYSICA C LA English DT Article ID HIGH-TC SUPERCONDUCTIVITY; LATTICE INSTABILITY; OXYGEN DEFECTS; COPPER OXIDES; X-RAY; TEMPERATURE; TRANSITION; SYSTEM; SCATTERING; BA AB We present the results of neutron-diffraction experiments on a series of La2-xSrCuO4+delta single crystals at temperatures between 540 K and 22 K. There is an intrinsic misfit between the size of the LaO9 polyhedra and the CuO6 octahedra, which seems to cause the structural transition from the high-temperature tetragonal (HTT) to the low-temperature orthorhombic (LTO) phase. Within this misfit model it is possible to explain almost the entire phenomenology of the HTT-LTO transition. The electronic structure is related to this phase transition via the length of the Cu-O bonds. One of the effects of the transition on the structure is to lengthen these Cu-O bonds and hence to alter the electronic band structure. The introduction of additional charge by doping leads to a decrease of the equilibrium Cu-O distances, and hence to a reduction of the misfit. In this way the, charge-carrier concentration determines the structural transition. We always observe strongly anisotropic thermal parameters, which confirm the instability of the La2-xSrCuO4 structure against a rotation of the CuO6 octahedra around any axis. In the case of an undoped crystal (x=0.0), we find a good agreement between the experimental mean square displacements and the results of a lattice dynamics model which is based on the known phonon dispersion curves. In a doped (x=0.13) and superconducting crystal, the anharmonic effects related to the structural transition lead to significant changes in the temperature dependence of the thermal parameters. C1 KERNFORSCHUNGSZENTRUM KARLSRUHE, INST NUKL FESTKORPERPHYS, D-76021 KARLSRUHE, GERMANY. RHEIN WESTFAL TH AACHEN, INST KRISTALLOG, D-52066 AACHEN, GERMANY. ACAD SCI, INST GEN PHYS, MOSCOW 117942, RUSSIA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. YAMANASHI UNIV, INST INORGAN SYNTH, KOFU, YAMANASHI 400, JAPAN. RP BRADEN, M (reprint author), CEA, CNRS, LEON BRILLOUIN LAB, F-91191 GIF SUR YVETTE, FRANCE. RI Tanaka, Isao/D-1519-2012 NR 68 TC 52 Z9 52 U1 0 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD APR 10 PY 1994 VL 223 IS 3-4 BP 396 EP 416 DI 10.1016/0921-4534(94)91284-X PG 21 WC Physics, Applied SC Physics GA NG476 UT WOS:A1994NG47600023 ER PT J AU BARBIERI, A VANHOVE, MA SOMORJAI, GA AF BARBIERI, A VANHOVE, MA SOMORJAI, GA TI BENZENE COADSORBED WITH CO ON PD(111) AND RH(111) - DETAILED MOLECULAR DISTORTIONS AND INDUCED SUBSTRATE RELAXATIONS SO SURFACE SCIENCE LA English DT Article ID ENERGY-ELECTRON-DIFFRACTION; LEED INTENSITY ANALYSIS; CLOSE-PACKED SURFACE; INDUCED RECONSTRUCTION; CARBON-MONOXIDE; X 2)-O; PT(111); OXYGEN; ADSORPTION; IV AB Two coadsorbed benzene/CO structures on Pd(111) and Rh(111) have been reanalyzed by automated tensor LEED. This computation permits the simultaneous optimization of many more atomic coordinates than before. The results show significant admolecule-induced substrate relaxations, the benzene causing an outward buckling and the CO causing a smaller inward buckling in the topmost metal layer. This analysis also confirms, on Rh(111), the likely presence of Kekule distortions in the benzene carbon ring (i.e. alternating long and short C-C bond lengths around the ring), with a sizable C-ring expansion. Together with improved scattering potentials, the R-factors are reduced by 44% and 28%, respectively. The clean surface structures were also re-examined in terms of multilayer relaxations, yielding a slight contraction of the topmost Rh-Rh interlayer spacing, but a slight expansion for Pd. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI Van Hove, Michel/A-9862-2008 OI Van Hove, Michel/0000-0002-8898-6921 NR 26 TC 63 Z9 63 U1 2 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD APR 10 PY 1994 VL 306 IS 3 BP 261 EP 268 DI 10.1016/0039-6028(94)90070-1 PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA NF175 UT WOS:A1994NF17500004 ER PT J AU TOSTES, JGR CARNEIRO, JWD LIE, SK SEIDL, PR TAFT, CA SOTO, MM LESTER, WA HAMMOND, BL AF TOSTES, JGR CARNEIRO, JWD LIE, SK SEIDL, PR TAFT, CA SOTO, MM LESTER, WA HAMMOND, BL TI HYPERCONJUGATION AND CHARGE-DISTRIBUTION IN ALICYCLIC ALCOHOLS AND EXO-NORBORNOL AND ENDO-NORBORNOL SO THEOCHEM-JOURNAL OF MOLECULAR STRUCTURE LA English DT Article ID CONSEQUENCES AB Ab initio and MM2 calculations are used to investigate charge distributions in selected alcohols (methanol, ethanol, 2-propanol and t-butanol and exo- and endo-norbornol). The calculated net atomic charges obtained using full optimized geometries with a range of basis sets (STO-3G,4-31G, 6-31G**) indicates that selected carbon and hydrogen atoms in the proximity of a nonbonding oxygen lone pair are more negatively charged and the carbon-hydrogen bonds are longer than usual. Analysis of the fully optimized geometries, HOMO population and net atomic charges suggests that the differences in charge distribution on the carbon and hydrogen atoms and their bond lengths can be explained in terms of hyperconjugation. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV FED FLUMINENSE,DEPT FIS QUIM,BR-24249 NITEROI,RJ,BRAZIL. CONSELHO NACL DESENVOLVIMENTO CIENT & TECNOL,CTR TECNOL MINERAL,BR-21949 RIO JANEIRO,BRAZIL. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. FUJITSU AMER INC,DIV COMPUTAT RES,SAN JOSE,CA 95134. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV FED FLUMINENSE,DEPT FIS,BR-24249 NITEROI,RJ,BRAZIL. UNIV FED FLUMINENSE,DEPT QUIM GERAL & INORGAN,BR-24249 NITEROI,RJ,BRAZIL. RI Carneiro, Jose/I-9932-2014 OI Carneiro, Jose/0000-0002-3491-1764 NR 17 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-1280 J9 THEOCHEM-J MOL STRUC JI Theochem-J. Mol. Struct. PD APR 10 PY 1994 VL 112 IS 2-3 BP 101 EP 113 PG 13 WC Chemistry, Physical SC Chemistry GA NH340 UT WOS:A1994NH34000002 ER PT J AU SHKROB, IA AF SHKROB, IA TI SPIN-ECHO RYDMR - A THEORETICAL-EXAMINATION SO CHEMICAL PHYSICS LETTERS LA English DT Article ID DETECTED MAGNETIC-RESONANCE; EXCIPLEX SYSTEMS; RADICAL PAIRS; KINETICS; PULSE AB It is shown theoretically that a sequence of two identical microwave pulses with a time delay DELTAt and a phase difference phi between them generates a RYDMR signal which oscillates as cos phi in the phase domain and as a periodic function of DELTAt in the time domain. A striking similarity of this behaviour to electron spin-echo envelope modulation suggests regarding this phenomenon as a generation of RYDMR echo. RP SHKROB, IA (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 15 TC 6 Z9 6 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 APR 8 PY 1994 VL 220 IS 6 BP 347 EP 352 DI 10.1016/0009-2614(94)00188-X PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NE929 UT WOS:A1994NE92900001 ER PT J AU RODRIGUEZ, JA HRBEK, J AF RODRIGUEZ, JA HRBEK, J TI SYNERGISTIC INTERACTIONS IN 3-CENTER METAL-METAL BONDING - CU-ZN ON RU(0001) SO CHEMICAL PHYSICS LETTERS LA English DT Article ID ELECTRON-ACCEPTOR INTERACTIONS; BIMETALLIC SURFACES; THERMAL-DESORPTION; CO CHEMISORPTION; AU FILMS; ADSORPTION; XPS; PHOTOEMISSION; PT(111); W(110) AB Cu and Zn alloy when co-adsorbed on top of Ru(0001). The properties of these alloy films have been examined using thermal desorption mass spectroscopy, core-level photoemission, and CO chemisorption. For submonolayer coverages of Cu and Zn, the interaction among the Ru-Zn, Ru-Cu and Zn-Cu bonds produces a system that has electronic and chemical properties significantly different from those of Cu/Ru(0001), Zn/Ru(0001) and thick copper zinc alloys. Two-dimensional copper zinc alloys supported on Ru(0001) show Zn-Ru and Zn-Cu bonds more stable than the corresponding bonds in Zn/Ru(0001) or thick CuZn alloys. We propose that this phenomenon is caused by synergistic interactions in three-center metal-metal bonding. RP RODRIGUEZ, JA (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,POB 5000,UPTON,NY 11973, USA. RI Hrbek, Jan/I-1020-2013 NR 45 TC 4 Z9 4 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 APR 8 PY 1994 VL 220 IS 6 BP 486 EP 492 DI 10.1016/0009-2614(94)00194-4 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NE929 UT WOS:A1994NE92900024 ER PT J AU ANDERKO, A PRAUSNITZ, JM AF ANDERKO, A PRAUSNITZ, JM TI ON THE RELATIONSHIP BETWEEN THE EQUILIBRIUM-CONSTANTS OF CONSECUTIVE ASSOCIATION REACTIONS SO FLUID PHASE EQUILIBRIA LA English DT Article DE THEORY; EQUATION OF STATE; ASSOCIATION; MIXTURES; HYDROGEN BONDING ID STATE; EQUATION AB Generalized association models for fluids require a large number of adjustable parameters (equilibrium constants) unless some effort is made to interrelate the different association constants. An association model has been developed by considering the probability of consecutive association reactions and the effect of that probability on the entropy of association. The relationship between the equilibrium constants of these reactions has been expressed by a function related to the Poisson distribution. When combined with an equation of state, the model accurately represents the properties of hydrogen fluoride and its mixtures with halogenated hydrocarbons. The Poisson distribution model is compared with the classical continuous linear association model. While the Poisson distribution model is superior for molecules that preferentially form associates of moderate size, the continuous linear model is more appropriate for molecules that can form polymers with a high degree of polymerization. C1 UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. OI Anderko, Andrzej/0000-0002-1522-4889 NR 13 TC 26 Z9 26 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3812 J9 FLUID PHASE EQUILIBR JI Fluid Phase Equilib. PD APR 8 PY 1994 VL 95 BP 59 EP 71 DI 10.1016/0378-3812(94)80061-8 PG 13 WC Thermodynamics; Chemistry, Physical; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA NK305 UT WOS:A1994NK30500005 ER PT J AU HU, Y LIU, HL PRAUSNITZ, JM AF HU, Y LIU, HL PRAUSNITZ, JM TI A MODEL-FREE METHOD FOR CALCULATING VAPOR-LIQUID-EQUILIBRIA FOR MULTICOMPONENT SYSTEMS FROM TOTAL-PRESSURE OR BOILING-POINT DATA SO FLUID PHASE EQUILIBRIA LA English DT Article DE THEORY; METHODS OF CALCULATION; VAPOR LIQUID EQUILIBRIA; TOTAL-PRESSURE DATA; BOILING-POINT DATA; MULTICOMPONENT SYSTEMS ID BINARY-SYSTEMS; DICHLOROMETHANE SYSTEM; BENZENE SYSTEM; METHANOL; ACETONITRILE; ACETATE; ACETONE; 50-DEGREES-C AB A curved-surface spline function is used to describe the reduced excess Gibbs energy for multicomponent liquid mixtures in a model-free thermodynamic method for calculating vapor compositions from experimental temperatures, pressures and liquid compositions. A Newton-Raphson iteration procedure modified by Broyden is used for solving the method's nonlinear equations. The method is illustrated with calculations for a variety of binaries, ternaries and two quaternaries at low or moderate pressures; these calculations indicate that this new method is both stable and reliable. Calculated vapor compositions are in good agreement with experiment. The method converges rapidly and has no special requirements for selecting initial guesses. The method may be used for either isothermal or isobaric data. C1 UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. E CHINA UNIV SCI & TECHNOL,THERMODYNAM RES LAB,SHANGHAI 200237,PEOPLES R CHINA. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. NR 40 TC 10 Z9 11 U1 4 U2 14 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3812 J9 FLUID PHASE EQUILIBR JI Fluid Phase Equilib. PD APR 8 PY 1994 VL 95 BP 73 EP 92 DI 10.1016/0378-3812(94)80062-6 PG 20 WC Thermodynamics; Chemistry, Physical; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA NK305 UT WOS:A1994NK30500006 ER PT J AU LEUNG, S ODONNELL, ME MARTINEZ, A PALFREY, HC AF LEUNG, S ODONNELL, ME MARTINEZ, A PALFREY, HC TI REGULATION BY NERVE GROWTH-FACTOR AND PROTEIN-PHOSPHORYLATION OF NA/K/2CL COTRANSPORT AND CELL-VOLUME IN PC12 CELLS SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID K-CL COTRANSPORT; PHEOCHROMOCYTOMA CELLS; OKADAIC ACID; NA+/K+/CL COTRANSPORT; EPITHELIAL TISSUES; BUMETANIDE BINDING; AVIAN ERYTHROCYTES; TRANSPORT; KINASE; STIMULATION AB PC12 cells possess a bumetanide sensitive Na/K/2Cl cotransport system similar to that found in other cell types. Between 10-15% of the total Rb-86 influx in these cells is mediated by this pathway under normal conditions. The cotransporter has affinities of 16.5 mM for Na-o and 0.7 mM for K-o, is absolutely dependent on Cl-o and is loop diuretic inhibitable (benzmetanide > bumetanide > piretanide > furosemide). The cotransporter can be activated (up to 8-fold) by cell shrinkage or (up to 4-fold) by treatment with the protein phosphatase inhibitors okadaic acid (EC(50) similar to 650 nM) or calyculin A (EC(50) similar to 8 nM). Cell shrinkage is followed by a bumetanide-sensitive regulatory volume increase as determined in cell sizing experiments. Calyculin A rapidly elevates normal cell volume in a diuretic-inhibitable manner. Cotransport activity and cell volume are also increased by nerve growth factor (NGF) treatment. The effect of NGF on cotransport rate is biphasic, with an initial rapid similar to 2.5-fold increase followed by a prolonged plateau, and is blocked by pretreatment of the cells with K252a (IC50 similar to 30 nM). By contrast, agents that raise cAMP or phorbol esters lead to an inhibition of cotransport, indicating that the NGF effect is not mediated by stimulation of either cAMP dependent protein kinase or protein kinase C. Long term NGF treatment (>2 days) leads to neurite formation and a maintained similar to 2-fold increase in cotransport activity. Bumetanide treatment does not affect the ability of cells to extend neurites, nor is the growth rate of cells in normal medium affected by the diuretic. These results suggest that the cotransport system in PC12 cells is acutely regulated by protein phosphorylation and dephosphorylation as well as cell shrinkage and that cotransport activity may be up-regulated during neuronotypic differentiation. C1 UNIV CHICAGO, DEPT PHARMACOL & PHYSIOL SCI, CHICAGO, IL 60637 USA. LAWRENCE LIVERMORE NATL LAB, DEPT HUMAN PHYSIOL, DAVIS, CA 95616 USA. NR 53 TC 42 Z9 43 U1 1 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 APR 8 PY 1994 VL 269 IS 14 BP 10581 EP 10589 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA NF017 UT WOS:A1994NF01700060 PM 8144646 ER PT J AU CAHN, RN JACKSON, JD QUIGG, C AF CAHN, RN JACKSON, JD QUIGG, C TI MISREPRESENTATION AND FANTASY SO SCIENCE LA English DT Letter C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. FERMILAB NATL ACCELERATOR LAB,DEPT THEORET PHYS,BATAVIA,IL 60510. RP CAHN, RN (reprint author), LAWRENCE BERKELEY LAB,DIV PHYS,BERKELEY,CA 94720, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD APR 8 PY 1994 VL 264 IS 5156 BP 185 EP 185 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NE410 UT WOS:A1994NE41000002 ER PT J AU HINCHLIFFE, I AF HINCHLIFFE, I TI PHONETICS LESSON SO SCIENCE LA English DT Letter RP HINCHLIFFE, I (reprint author), LAWRENCE BERKELEY LAB,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD APR 8 PY 1994 VL 264 IS 5156 BP 188 EP 188 DI 10.1126/science.264.5156.188-b PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NE410 UT WOS:A1994NE41000011 ER PT J AU STOFFELS, JJ ELLS, DR BOND, LA FREEDMAN, PA TATTERSALL, BN LAGERGREN, CR AF STOFFELS, JJ ELLS, DR BOND, LA FREEDMAN, PA TATTERSALL, BN LAGERGREN, CR TI A TRIPLE-SECTOR MASS-SPECTROMETER WITH HIGH TRANSMISSION EFFICIENCY AND 10(-11) ISOTOPE-ABUNDANCE SENSITIVITY SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES LA English DT Article DE MASS SPECTROMETER; ISOTOPE RATIO; MULTISECTOR; ABUNDANCE SENSITIVITY; ION TRANSMISSION AB We have used standard commercial mass spectrometer components to construct a triple-sector mass spectrometer of unique ion-optical design that achieves exceptional isotope-abundance sensitivity and high ion transmission efficiency. The spectrometer has tandem 90-degrees deflection magnets with off-normal boundaries to provide vertical focusing of the ion beam. The first magnet provides a focus in the horizontal plane of mass dispersion and renders the ion beam parallel in the vertical plane. The second magnet brings the beam to a stigmatic focus. This novel ion-optical design gives 100% ion transmission without the need for intermediate focusing lenses. It also prevents ion scattering from the top and bottom of the flight tube, thereby increasing isotope-abundance sensitivity. Complete transmission of ions is maintained through a third-stage cylindrical electric sector that further improves abundance sensitivity. The uranium equivalent isotope-abundance sensitivity of the new mass spectrometer is 1 x 10(-11), a two-orders-of-magnitude improvement over similar instruments with normal magnet boundaries. C1 VG ISOTECH, MIDDLEWICH CW10 0HT, CHESHIRE, ENGLAND. WESTINGHOUSE HANFORD CO, RICHLAND, WA 99352 USA. RP STOFFELS, JJ (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 4 TC 11 Z9 11 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1176 J9 INT J MASS SPECTROM JI Int. J. Mass Spectrom. Ion Process. PD APR 7 PY 1994 VL 132 IS 3 BP 217 EP 224 DI 10.1016/0168-1176(93)03943-G PG 8 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA NF475 UT WOS:A1994NF47500006 ER PT J AU MAHAJAN, D KOBAYASHI, A GUPTA, N AF MAHAJAN, D KOBAYASHI, A GUPTA, N TI FISCHER-TROPSCH SYNTHESIS CATALYZED BY ULTRAFINE PARTICLES OF IRON - CESSATION OF WATER-GAS SHIFT ACTIVITY SO JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS LA English DT Article AB Slurry-phase hydrocarbon synthesis is affected at 220-degrees-C with reduced ultrafine particles of alpha-Fe2O3 (3 nm) in the absence of water-gas shift activity. RP MAHAJAN, D (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,BLDG 815,UPTON,NY 11973, USA. NR 10 TC 10 Z9 10 U1 0 U2 0 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0022-4936 J9 J CHEM SOC CHEM COMM JI J. Chem. Soc.-Chem. Commun. PD APR 7 PY 1994 IS 7 BP 795 EP 796 DI 10.1039/c39940000795 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA NF898 UT WOS:A1994NF89800004 ER PT J AU COLE, DR MONGER, HC AF COLE, DR MONGER, HC TI INFLUENCE OF ATMOSPHERIC CO2 ON THE DECLINE OF C4 PLANTS DURING THE LAST DEGLACIATION SO NATURE LA English DT Article ID ISOTOPIC COMPOSITION; ICE CORE; PALEOCLIMATIC SIGNIFICANCE; NORTH-AMERICA; CARBON; RECORD; PALEOSOLS; CLIMATE AB CHANGES in atmospheric carbon dioxide concentrations in the past may have caused changes in vegetation type1,2, and it has been suggested2 that the isotopic signature of such vegetation shifts, preserved in palaeosols3, might be used as a proxy for past CO2 variations. But the connection between palaeosol isotopic signatures and atmospheric CO2 concentrations has been difficult to establish, partly because of the unreliability of CO2 proxies and partly because of the difficulty in ruling out other potential causes of vegetation changes, such as climate4. Here we present palaeosol carbon isotope ratios that reveal a shift from C4-dominated grasses to C3-dominated shrubs about 7-9 kyr ago on an alluvial fan system in the Chihuahuan desert, New Mexico. This coincides with a rapid increase in atmospheric CO2 concentration recorded in Antarctic ice cores5-8 and increased aridity recorded by geomorphic reconstructions9-11 and packrat remains12. Palaeosol oxy gen isotope ratios, which depend on temperature and moisture, were relatively constant during the vegetation shift, suggesting that the CO2 change, rather than climate, was the dominant cause. We conclude that the carbon isotope ratios of ancient soils can indeed be used as a proxy for past CO2 changes. C1 NEW MEXICO STATE UNIV, DEPT AGRON & HORT, LAS CRUCES, NM 88003 USA. RP COLE, DR (reprint author), OAK RIDGE NATL LAB, DIV CHEM & ANALYT SCI, OAK RIDGE, TN 37831 USA. NR 34 TC 78 Z9 80 U1 0 U2 7 PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 J9 NATURE JI Nature PD APR 7 PY 1994 VL 368 IS 6471 BP 533 EP 536 DI 10.1038/368533a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NE335 UT WOS:A1994NE33500050 ER PT J AU CASTEN, RF ZAMFIR, NV BRENNER, DS AF CASTEN, RF ZAMFIR, NV BRENNER, DS TI A SIMPLE SHELL-MODEL INTERPRETATION OF THE EVOLUTION OF STRUCTURE IN PRE-COLLECTIVE NUCLEI SO PHYSICS LETTERS B LA English DT Article AB The evolution of structure in pre-collective nuclei from oxygen to actinides is studied in terms of the structural signature R4/2 = E(4(1)+)/E(2(1)+) in singly magic nuclei. A simple physical interpretation of these empirical trends is discussed in terms and illustrated with schematic shell model calculations. The basic idea does not depend on details of the calculations but rather invokes only very general features of nuclear shell structure and the fact that the nuclear force is short-range and attractive. C1 UNIV COLOGNE,INST KERNPHYS,W-5000 COLOGNE 41,GERMANY. CLARK UNIV,WORCESTER,MA 01610. INST ATOM PHYS,BUCHAREST,ROMANIA. RP CASTEN, RF (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Zamfir, Nicolae Victor/F-2544-2011 NR 14 TC 6 Z9 6 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD APR 7 PY 1994 VL 324 IS 3-4 BP 267 EP 272 DI 10.1016/0370-2693(94)90192-9 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NF462 UT WOS:A1994NF46200002 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R ALEKSEEV, GD ALLPORT, P ALMEHED, S ALMEIDA, FML ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLOCKI, J BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUDZIAK, A BUGGE, L BURAN, T BUYS, A BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASES, R CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVIES, J DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRANDERE, S DECLERCQ, C LASO, MDMD DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EEK, LO EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FASSOULIOTIS, D FEINDT, M FENYUK, A FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FORMENTI, F FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GILLESPIE, D GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY GOPAL, G GORN, L GORSKI, M GRACCO, V GRARD, F GRAZIANI, E GROSDIDIER, G GROSSETETE, B GUNNARSSON, P GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERNANDO, JA HERQUET, P HERR, H HESSING, TL HIGGINS, CO HIGON, E HILKE, HJ HILL, TS HODGSON, SD HOFMOKL, T HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HONORE, PF HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JACOBSSON, R JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONKER, M JONSSON, L JUILLOT, P KAISER, M KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUPINSKI, W KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LEVY, JM LIEB, E LIKO, D LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTI, S MARTINEZRIVERO, C MARTINEZVIDAL, F MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A NOVAK, M OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G ROMERO, A RONCAGLIOLO, I RONCHESE, P ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORASSA, E TORTORA, L TREILLE, D TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VANELDIK, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WORMSER, G WOSCHNAGG, K ZAITSEV, A ZALEWSKA, A ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G AF ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R ALEKSEEV, GD ALLPORT, P ALMEHED, S ALMEIDA, FML ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLOCKI, J BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUDZIAK, A BUGGE, L BURAN, T BUYS, A BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASES, R CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVIES, J DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRANDERE, S DECLERCQ, C LASO, MDMD DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EEK, LO EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FASSOULIOTIS, D FEINDT, M FENYUK, A FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FORMENTI, F FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GILLESPIE, D GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY GOPAL, G GORN, L GORSKI, M GRACCO, V GRARD, F GRAZIANI, E GROSDIDIER, G GROSSETETE, B GUNNARSSON, P GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERNANDO, JA HERQUET, P HERR, H HESSING, TL HIGGINS, CO HIGON, E HILKE, HJ HILL, TS HODGSON, SD HOFMOKL, T HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HONORE, PF HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JACOBSSON, R JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONKER, M JONSSON, L JUILLOT, P KAISER, M KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUPINSKI, W KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LEVY, JM LIEB, E LIKO, D LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTI, S MARTINEZRIVERO, C MARTINEZVIDAL, F MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A NOVAK, M OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G ROMERO, A RONCAGLIOLO, I RONCHESE, P ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORASSA, E TORTORA, L TREILLE, D TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VANELDIK, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WORMSER, G WOSCHNAGG, K ZAITSEV, A ZALEWSKA, A ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G TI A MEASUREMENT OF THE B(S)0 MESON MASS SO PHYSICS LETTERS B LA English DT Article ID QUARK EFFECTIVE THEORY; DECAYS; BS; HADRONS AB Strange beauty mesons B(s)0 have been reconstructed through exclusive hadronic final states, using the data collected in 1992 by the DELPHI experiment at the LEP collider. The analysis relies on the combined use of accurate tracking and of the hadron identification capabilities of DELPHI. Three B(s)0 decay candidates have been selected over a negligible background using the D(s)- pi+, D(s)- a1+ (1260) and J/ psi phi decay modes, with identified kaons in the final state. The B(s)0 meson mass is measured to be m(b)s = (5374 +/- 16 +/- 2) MeV/c2. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. COLL FRANCE,IN2P3,CNRS,PHYS CORPUSCULAIRE LAB,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. UNIV PARIS 11,IN2P3,CNRS,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE. UNIV LYON 1,IPNL,IN2P3,CNRS,F-69622 VILLEURBANNE,FRANCE. INFN,I-16146 GENOA,ITALY. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. LUND UNIV,DEPT PHYS,S-22362 LUND,SWEDEN. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. VUB,ULB,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. INFN,I-40126 BOLOGNA,ITALY. ULP,IN2P3,CNRS,CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. FZU,DIV CAS HIGH ENERGY PHYS,INST PHYS,CS-18040 PRAGUE 8,CZECH REPUBLIC. UNIV GRENOBLE 1,IN2P3,CNRS,INST SCI NUCL,F-38026 GRENOBLE,FRANCE. JOINT INST NUCL RES,MOSCOW 101000,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76128 KARLSRUHE,GERMANY. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. FCUL,IST,LIP,P-1000 LISBON,PORTUGAL. UNIV PARIS 06 & 07,IN2P3,CNRS,LPNHE,F-75252 PARIS 05,FRANCE. UNIV COMPLUTENSE MADRID,E-28040 MADRID,SPAIN. UNIV HELSINKI,SEFT,HIGH ENERGY PHYS RES INST,SF-00014 HELSINKI,FINLAND. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV STOCKHOLM,S-11385 STOCKHOLM,SWEDEN. INFN,I-00173 ROME,ITALY. UNIV LJUBLJANA,DEPT PHYS,61000 LJUBLJANA,SLOVENIA. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. UNIV AIX MARSEILLE 02,CPP,IN2P3,CNRS,F-13288 MARSEILLE 09,FRANCE. INFN,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. CHARLES UNIV,NUCL CTR MFF,CS-18000 PRAGUE 8,CZECH REPUBLIC. NATL INST NUCL PHYS & HIGH ENERGY PHYS,1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV OVIEDO,DEPT FIS,E-33006 OVIEDO,SPAIN. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. INFN,I-35131 PADUA,ITALY. PONTIFICIA UNIV CATOLICA,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. CTR ETUD SACLAY,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. IST SUPER SANITA,INFN,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN. INST HIGH ENERGY PHYS,PROTVINO,RUSSIA. UNIV LJUBLJANA,J STEFAN INST,61000 LJUBLJANA,SLOVENIA. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. INFN,I-10125 TURIN,ITALY. INFN,I-34127 TRIESTE,ITALY. UNIV FED RIO DE JANEIRO,BR-21945970 RIO JANEIRO,BRAZIL. UNIV VALENCIA,DEAMN,E-46100 BURJASSOT,SPAIN. OSTERR AKAD WISSENSCH,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. UNIV WARSAW,PL-00681 WARSAW,POLAND. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. IFIC,VALENCIA,SPAIN. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. UNIV VALENCIA,CSIC,E-46100 BURJASSOT,SPAIN. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. RP ABREU, P (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Hernando Morata, Jose Angel/L-7642-2014; gandelman, miriam/N-3739-2014; Ragazzi, Stefano/D-2463-2009; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Smirnova, Oxana/A-4401-2013; Lozano-Bahilo, Julio/F-4881-2016; Olshevskiy, Alexander/I-1580-2016; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Hallgren, Allan/A-8963-2013; Nomerotski, Andrei/A-5169-2010; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Torassa, Ezio/I-1788-2012; Giacomelli, Paolo/B-8076-2009; Fruhwirth, Rudolf/H-2529-2012; Andreazza, Attilio/E-5642-2011; Verlato, Marco/J-4604-2012; Dracos, Marcos/K-2335-2012; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; Botner, Olga/A-9110-2013; Marti-Garcia, Salvador/F-3085-2011; Vaz, Pedro/K-2464-2013; Monge, Maria Roberta/G-9127-2012; Nemecek, Stanislav/G-5931-2014; Ridky, Jan/H-6184-2014; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Espirito Santo, Maria Catarina/L-2341-2014; Pimenta, Mario/M-1741-2013; Gomez Cadenas, Juan Jose/L-2003-2014 OI PREST, MICHELA/0000-0003-3161-4454; De Lotto, Barbara/0000-0003-3624-4480; Tabarelli de Fatis, Tommaso/0000-0001-6262-4685; Lacasta, Carlos/0000-0002-2623-6252; Torassa, Ezio/0000-0003-2321-0599; Hernando Morata, Jose Angel/0000-0002-8683-5142; Ragazzi, Stefano/0000-0001-8219-2074; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Smirnova, Oxana/0000-0003-2517-531X; Lozano-Bahilo, Julio/0000-0003-0613-140X; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Ruiz, Alberto/0000-0002-3639-0368; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; Andreazza, Attilio/0000-0001-5161-5759; Verlato, Marco/0000-0003-1967-7655; Dracos, Marcos/0000-0003-0514-193X; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Matteuzzi, Clara/0000-0002-4047-4521; DE MIN, ALBERTO/0000-0002-8130-9389; Demaria, Natale/0000-0003-0743-9465; Bonesini, Maurizio/0000-0001-5119-1896; Sannino, Mario/0000-0001-7700-8383; Vaz, Pedro/0000-0002-7186-2359; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Tome, Bernardo/0000-0002-7564-8392; Espirito Santo, Maria Catarina/0000-0003-1286-7288; Pimenta, Mario/0000-0002-2590-0908; Gomez Cadenas, Juan Jose/0000-0002-8224-7714 NR 13 TC 14 Z9 14 U1 1 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD APR 7 PY 1994 VL 324 IS 3-4 BP 500 EP 508 DI 10.1016/0370-2693(94)90230-5 PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA NF462 UT WOS:A1994NF46200040 ER PT J AU ESPENSON, JH PESTOVSKY, O HUSTON, P STAUDT, S AF ESPENSON, JH PESTOVSKY, O HUSTON, P STAUDT, S TI ORGANOMETALLIC CATALYSIS IN AQUEOUS-SOLUTION - OXYGEN-TRANSFER TO BROMIDE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID MAIN-GROUP ELEMENTS; VANADIUM BROMOPEROXIDASE; TRANSITION-METALS; MULTIPLE BONDS; METHYLTRIOXORHENIUM; MECHANISM AB The reaction between hydrogen peroxide and bromide ions in aqueous acidic solutions, ordinarily very slow, is strongly catalyzed by CH3ReO3, a water-soluble organometallic oxide. The complex catalytic kinetics showed that the rate-controlling process consists of two steps: (1) reversible formation of the independently-known 1:1 and 2:1 adducts of hydrogen peroxide and methylrhenium trioxide (the formulas, including the water that had been shown to be coordinated, are CH3Re(O)(2)(eta(2)-O-2)(H2O) and CH3Re(O)(eta(2)-O-2)(2)(H2O)) and (2) their reactions with bromide ions that yield HOBr. The rate constants for these steps were evaluated by several steady-state kinetic techniques. The HOBr intermediate reacts with Br- to yield Br-2. When hydrogen peroxide was in excess, the reaction yielded oxygen instead of bromine. This can be accounted for by the reaction of HOBr with H2O2 The 2:1 peroxide-rhenium adduct, formed only at the higher concentrations of hydrogen peroxide, also reacts with bromide ions, but more slowly. Kinetic modeling by numerical techniques was used to provide verification of the reaction scheme. The various steps of peroxide activation consist of nucleophilic attack of bromide ions on peroxide ions that have become electrophilically activated by binding to; the rhenium compound. The rhenium catalyst bears some resemblance to the enzyme vanadium bromoperoxidase. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP ESPENSON, JH (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 19 TC 90 Z9 90 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD APR 6 PY 1994 VL 116 IS 7 BP 2869 EP 2877 DI 10.1021/ja00086a020 PG 9 WC Chemistry, Multidisciplinary SC Chemistry GA NG378 UT WOS:A1994NG37800020 ER PT J AU PENG, G DEGROOT, FMF HAMALAINEN, K MOORE, JA WANG, X GRUSH, MM HASTINGS, JB SIDDONS, DP ARMSTRONG, WH MULLINS, OC CRAMER, SP AF PENG, G DEGROOT, FMF HAMALAINEN, K MOORE, JA WANG, X GRUSH, MM HASTINGS, JB SIDDONS, DP ARMSTRONG, WH MULLINS, OC CRAMER, SP TI HIGH-RESOLUTION MANGANESE X-RAY-FLUORESCENCE SPECTROSCOPY - OXIDATION-STATE AND SPIN-STATE SENSITIVITY SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID OCTAHEDRAL SYMMETRY; ABSORPTION; COMPLEXES; SPECTRA AB K beta X-ray emission spectra have been recorded for Mn(II), Mn(III), and Mn(IV) compounds with a variety of ligands. The spectra have be interpreted and simulated as atomic multiplets perturbed by a crystal field. The X-ray fluorescence in this region, which results from 3p --> 1s transitions, is split between a strong K beta(1,3) region and a weaker K beta' satellite. For Mn(II) complexes, the K beta' region derives from final states with antiparallel net spins between the 3p(5) hole and the 3d(5) valence shell. The K beta(1,3) region is dominated by spin-parallel final states. For octahedral high-spin Mn(II), Mn(III), and Mn(IV) complexes, the K beta(1,3) peak position shifts to lower energy with increasing oxidation state. The K beta' feature is weaker and broader for the higher oxidation states, and it is almost unobservable for low-spin Mn(III). K beta fluorescence is a good probe of Mn spin state and oxidation state. Spin-selective X-ray absorption near-edge spectra, taken by monitoring specific K beta features, are illustrated. The potential for site-selective absorption spectroscopy, based on monitoring chemically sensitive K beta features, is discussed. C1 UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA 95616. UNIV NIJMEGEN,6526 ED NIJMEGEN,NETHERLANDS. UNIV HELSINKI,DEPT PHYS,HELSINKI,FINLAND. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE DEPT,UPTON,NY 11973. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. BOSTON COLL,DEPT CHEM,BOSTON,MA 02140. SCHLUMBERGER DOLL RES CTR,RIDGEFIELD,CT 06877. RI Hamalainen, Keijo/A-3986-2010; de Groot, Frank/A-1918-2009 OI Hamalainen, Keijo/0000-0002-9234-9810; NR 29 TC 143 Z9 143 U1 4 U2 29 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD APR 6 PY 1994 VL 116 IS 7 BP 2914 EP 2920 DI 10.1021/ja00086a024 PG 7 WC Chemistry, Multidisciplinary SC Chemistry GA NG378 UT WOS:A1994NG37800024 ER PT J AU FENWICK, C MARMOR, S GOVINDARAJU, K ENGLISH, AM WISHART, JF SUN, J AF FENWICK, C MARMOR, S GOVINDARAJU, K ENGLISH, AM WISHART, JF SUN, J TI RATE OF INTRAMOLECULAR REDUCTION OF OXYFERRYL IRON IN HORSE HEART MYOGLOBIN SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID RANGE ELECTRON-TRANSFER; METMYOGLOBIN; PEROXIDE; HEME C1 CONCORDIA UNIV,DEPT CHEM & BIOCHEM,MONTREAL H3G 1M8,PQ,CANADA. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RI Wishart, James/L-6303-2013 OI Wishart, James/0000-0002-0488-7636 NR 20 TC 17 Z9 17 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD APR 6 PY 1994 VL 116 IS 7 BP 3169 EP 3170 DI 10.1021/ja00086a075 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA NG378 UT WOS:A1994NG37800075 ER PT J AU CATASTI, P GUPTA, G GARCIA, AE RATLIFF, R HONG, L YAU, P MOYZIS, RK BRADBURY, EM AF CATASTI, P GUPTA, G GARCIA, AE RATLIFF, R HONG, L YAU, P MOYZIS, RK BRADBURY, EM TI UNUSUAL STRUCTURES OF THE TANDEM REPETITIVE DNA-SEQUENCES LOCATED AT HUMAN CENTROMERES SO BIOCHEMISTRY LA English DT Article ID OXYTRICHA TELOMERIC DNA; MAGNETIC-RESONANCE; BASE PAIR; NMR; HAIRPINS; OLIGONUCLEOTIDES; STABILITY; (TTAGGG)N; PROTEINS; SPECTRA AB The presence of the highly conserved repetitive DNA sequence d(AATGG)n.d(CCATT)n in human centromeres argues for a special role for this sequence in recognition, most probably through the formation of an unusual structure during mitosis. Quantitative one- and two-dimensional nuclear magnetic resonance (1D/2D NMR) spectroscopic studies reveal that the Watson-Crick duplex d(AATGG)n.d(CCATT)n adopts the usual B-DNA conformation as illustrated by taking d(AATGG)3.d(CCATT)3 as an example, whereas the d(CCATT)n strand is essentially a random coil. In contrast, the d(AATGG), strand adopts an unusual stem-loop motif for repeat lengths n = 2, 3, 4, and 6. In addition to normal Watson-Crick A.T pairs, the stem-loop structures are stabilized by mismatched A.G and G-G pairs in the stem and G-G-A stacking in the loop. Stem-loop structures of d(AATGG)n are independently verified by gel electrophoresis and nuclease digestion studies and were also previously shown to be as stable as the corresponding Watson-Crick duplex d(AATGG)n.d(CCATT)n [Grady et al. (1992) Proc. Natl. Acad. Sci. U.S.A. 89, 1695-1699]. Therefore, the sequence d(AATGG)n can, indeed, nucleate a stem-loop structure at little free energy cost, and if, during mitosis, it is located on the chromosome surface, it can provide specific recognition sites for kinetochore function. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,M-S M881,POB 1663,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV T-10,THEORET BIOL & BIOPHYS GRP,LOS ALAMOS,NM 87545. UNIV CALIF DAVIS,SCH MED,DEPT BIOL CHEM,DAVIS,CA 95616. NR 30 TC 44 Z9 45 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD APR 5 PY 1994 VL 33 IS 13 BP 3819 EP 3830 DI 10.1021/bi00179a005 PG 12 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA NE341 UT WOS:A1994NE34100005 PM 8142384 ER PT J AU BAI, GR CHANG, HLM FOSTER, CM AF BAI, GR CHANG, HLM FOSTER, CM TI PREPARATION OF SINGLE-CRYSTAL Y3AL5O12 THIN-FILM BY METALORGANIC CHEMICAL-VAPOR-DEPOSITION SO APPLIED PHYSICS LETTERS LA English DT Article AB Single-crystal yttrium aluminum garnet (Y3Al5O12 or YAG) thin films have been grown on (111) Gd3Ga5O12 substrate by metalorganic chemical vapor deposition. X-ray diffraction, selective-area electron diffraction, and transmission electron microscopy were used to confirm the single-crystal nature of [111]-oriented single-crystal Y3Al5O12 thin films. We determined that the epitaxial relationship between the film and the substrate is (111)[110]Y3Al5O12//(111)[110BAR]Gd3Ga5O12. RP BAI, GR (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 7 TC 26 Z9 26 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 APR 4 PY 1994 VL 64 IS 14 BP 1777 EP 1779 DI 10.1063/1.111805 PG 3 WC Physics, Applied SC Physics GA NE025 UT WOS:A1994NE02500009 ER PT J AU LOWNDES, DH DESILVA, M GODBOLE, MJ PEDRAZA, AJ THUNDAT, T WARMACK, RJ AF LOWNDES, DH DESILVA, M GODBOLE, MJ PEDRAZA, AJ THUNDAT, T WARMACK, RJ TI SMOOTH POLYCRYSTALLINE CERAMIC SUBSTRATES WITH ENHANCED METAL ADHESION BY PULSED EXCIMER-LASER PROCESSING SO APPLIED PHYSICS LETTERS LA English DT Article ID SODIUM TRISILICATE; POLYMER SURFACES; SAPPHIRE; ABLATION; LIGHT AB Multishot pulsed XeCl (308 nm) excimer laser irradiation of commercial fine-grained polycrystalline alumina substrates is found to significantly improve their properties for metal film-bonding-applications. A smoother surface finish is obtained, and the adhesion strength of subsequently deposited copper films to the laser-treated alumina surface is increased by a factor of 3-5 (200%-400%) under optimum laser conditions. Smoothing occurs when the alumina melts and undergoes molten flow before resolidifying. XPS measurements suggest that electrical activation of the near-surface region also may contribute to the enhanced copper adhesion. C1 UNIV TENNESSEE,DEPT MAT SCI & ENGN,KNOXVILLE,TN 37996. UNIV TENNESSEE,DIV HLTH & SAFETY RES,KNOXVILLE,TN 37996. RP LOWNDES, DH (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. NR 17 TC 18 Z9 18 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD APR 4 PY 1994 VL 64 IS 14 BP 1791 EP 1793 DI 10.1063/1.111810 PG 3 WC Physics, Applied SC Physics GA NE025 UT WOS:A1994NE02500014 ER PT J AU FRITZ, IJ BLUM, O SCHNEIDER, RP HOWARD, AJ FOLLSTAEDT, DM AF FRITZ, IJ BLUM, O SCHNEIDER, RP HOWARD, AJ FOLLSTAEDT, DM TI ELECTRIC-FIELD-DEPENDENT ELECTROREFLECTANCE SPECTRA OF VISIBLE-BAND-GAP (INALGA)P QUANTUM-WELL STRUCTURES SO APPLIED PHYSICS LETTERS LA English DT Article ID LASER; NM; MODULATOR; DIODES; WET AB We present results from the first studies of electric-field effects on optical transitions in visible-band-gap InGaP/InAlGaP multiple-quantum-well (MQW) structures. These structures, grown at 775-degrees-C by metalorganic vapor phase epitaxy on (100) GaAs substrates misoriented 6-degrees towards [111]A, consist of nominally undoped MQWs surrounded by doped In0.49Al0.51P cladding layers to form p-i-n diodes. The Stark shifts of various allowed and forbidden quantum-well transitions were observed in bias-dependent electroreflectance spectra of In0.49Ga0.51P/In0.49(Al0.5Ga0.5)0.51P MQW samples with 10-nm-thick layers. We find the magnitude of these shifts to depend on the details of the Mg doping profile, confirming the importance of Mg diffusion and unintentional background doping in these materials. Our results show that (InAlGa)P materials are promising for visible-wavelength electro-optic modulator applications. RP FRITZ, IJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 16 TC 4 Z9 4 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD APR 4 PY 1994 VL 64 IS 14 BP 1824 EP 1826 DI 10.1063/1.111767 PG 3 WC Physics, Applied SC Physics GA NE025 UT WOS:A1994NE02500025 ER PT J AU ZHENG, ZF SALMERON, MB WEBER, ER AF ZHENG, ZF SALMERON, MB WEBER, ER TI EMPTY STATE AND FILLED STATE IMAGE OF ZNGA ACCEPTOR IN GAAS STUDIED BY SCANNING-TUNNELING-MICROSCOPY SO APPLIED PHYSICS LETTERS LA English DT Article AB Zn(Ga) acceptor atoms in the first to sixth layer below the GaAs (110) cleavage plane have been identified. For the first time, we find that the empty state scanning tunneling microscopy image of a Zn(Ga) acceptor is a characteristic equal latitude triangle-shaped feature of approximately 4 nm width with a (110) mirror plane. The filled state image, however, is a spherical feature of similar size. These unique features can be used as the signature for the identification Of Zn(Ga) in GaAs. C1 UNIV CALIF BERKELEY,DEPT MAT SCI,BERKELEY,CA 94720. RP ZHENG, ZF (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 6 TC 45 Z9 45 U1 1 U2 6 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 APR 4 PY 1994 VL 64 IS 14 BP 1836 EP 1838 DI 10.1063/1.111771 PG 3 WC Physics, Applied SC Physics GA NE025 UT WOS:A1994NE02500029 ER PT J AU KOCHA, SS TURNER, JA NOZIK, AJ AF KOCHA, SS TURNER, JA NOZIK, AJ TI STUDY OF THE SCHOTTKY-BARRIER AND DETERMINATION OF THE ENERGETIC POSITIONS OF BAND EDGES AT THE N-TYPE AND P-TYPE GALLIUM INDIUM-PHOSPHIDE ELECTRODE-ELECTROLYTE INTERFACE SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID SOLAR CONVERSION EFFICIENCY; JUNCTION; CELLS AB The ternary semiconductor GaInP2 (or Ga0.5In0.5P) was studied as a single-crystal electrode in contact with various aqueous electrolyte solutions (pH range 2.0-12.0). The photoelectrochemical properties of the epitaxially grown GaInP2 layers were characterized using techniques of current-voltage, capacitance-voltage and photocurrent spectroscopy. The results of capacitance-voltage measurements carried out at discrete frequencies from 100 Hz to 10 kHz demonstrate the presence of a depletion zone over the voltage range studied. This allowed the experimental determination of both the flat-band potential and the energetic positions of the band edges for both n- and p-doped GaInP2 at the semiconductor\electrolyte interface. These studies reveal the applicability of this relatively new material for the photoelectrochemical decomposition of water. C1 NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401. UNIV HAWAII MANOA,DEPT MECH ENGN,HONOLULU,HI 96822. RI Kocha, Shyam/E-4347-2010 NR 18 TC 28 Z9 28 U1 2 U2 14 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD APR 4 PY 1994 VL 367 IS 1-2 BP 27 EP 30 DI 10.1016/0022-0728(93)03020-P PG 4 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA NF567 UT WOS:A1994NF56700004 ER PT J AU CALDWELL, CD SCHAPHORST, SJ KRAUSE, MO JIMENEZMIER, J AF CALDWELL, CD SCHAPHORST, SJ KRAUSE, MO JIMENEZMIER, J TI PHOTOEXCITED K-AUGER SPECTRA OF ATOMIC AND MOLECULAR-OXYGEN SO JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA LA English DT Article ID ELECTRON-IMPACT IONIZATION; COLLISION INTERACTION PCI; CORE-EXCITED O-2; ANGULAR-DISTRIBUTION; HIGH-RESOLUTION; GAS ATOMS; DECAY; SHELL; SPECTROSCOPY; AUTOIONIZATION AB K Auger spectra of the oxygen atom following either 1s photoionization or 1s --> np photoexcitation are presented and compared with energy and transition rate calculations where available. Data are juxtaposed to earlier results on neon, showing that the excellent agreement between theory and experiment which exists for the closed-shell atom neon does not, at present, extend to the open-shell atom oxygen. Auger spectra following 1s --> 2p excitation in the O atom and 1s, 2p double ionization in Ne are found to have similar branching ratios. All major lines in the Auger spectra of oxygen could be resolved and fully analyzed with regard to energies, branching ratios, and angular distributions. A strong anisotropy is measured for the Auger transitions associated with the 1s --> 2p excitation. The 1sigma(u) --> 1pi(g) and 1sigma(g) --> 3sigma(u) resonance Auger spectra of molecular oxygen are also presented. The angular distributions of the high kinetic energy lines in the molecular spectra are measured, and the atomic-like Auger lines in the 3sigma(u) decay are compared with the pure atomic 2p decay spectrum. Energies of the Kalpha X-ray transitions in the atom are deduced. The experimental setup, which allowed us to record these low-Z atomic Auger spectra for the first time, is described in some detail. C1 OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. Univ Nacl Autonoma Mexico, INST CIENCIAS NUCL, MEXICO CITY 04510, DF, MEXICO. UNIV CENT FLORIDA, DEPT PHYS, ORLANDO, FL 32816 USA. RI Jimenez-Mier, Jose/A-5081-2009 OI Jimenez-Mier, Jose/0000-0002-5939-9568 NR 73 TC 37 Z9 37 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0368-2048 J9 J ELECTRON SPECTROSC JI J. Electron Spectrosc. Relat. Phenom. PD APR 4 PY 1994 VL 67 IS 2 BP 243 EP 259 DI 10.1016/0368-2048(93)02055-Q PG 17 WC Spectroscopy SC Spectroscopy GA NJ329 UT WOS:A1994NJ32900004 ER PT J AU LINDLE, DW LESMANNER, W STEINBECK, L VILLALOBOS, E LEVIN, JC SELLIN, IA AF LINDLE, DW LESMANNER, W STEINBECK, L VILLALOBOS, E LEVIN, JC SELLIN, IA TI AUGER-ELECTRON PHOTOION COINCIDENCE MEASUREMENTS OF ATOMS AND MOLECULES USING X-RAY SYNCHROTRON-RADIATION SO JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA LA English DT Article ID HIGH-ENERGY-RESOLUTION; SHAKE-OFF; ABSORPTION; THRESHOLD; BEAMLINE; EMISSION; SPECTRA; ARGON; KR AB As the availability of intense beams of hard X-rays from synchrotron-radiation sources has increased, interest in the fundamental interactions of X-rays with deep core electrons in free atoms and molecules has undergone a resurgence. These powerful X-ray sources have led to more highly differential measurements, providing ever more detailed information about atomic and molecular structure and dynamics. One such improvement in measurement technique is the application of electron-ion coincidence spectroscopy, which only recently has been extended to studies of deep core levels. A collaborative research program focusing on the dynamics of photoionization and Auger decay following hard X-ray absorption by atoms and small molecules, as well as subsequent fragmentation in the molecular case, has been ongoing at the National Synchrotron Light Source for the past few years. This report summarizes the capabilities of the program by reviewing results on argon near the K edge, and discusses briefly newer measurements on xenon and a few sulfur- and chlorine-containing molecules. C1 NATL INST STAND & TECHNOL, GAITHERSBURG, MD 20899 USA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37891 USA. UNIV TENNESSEE, DEPT PHYS, KNOXVILLE, TN 37996 USA. RP UNIV NEVADA, DEPT CHEM, LAS VEGAS, NV 89154 USA. NR 29 TC 22 Z9 22 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0368-2048 EI 1873-2526 J9 J ELECTRON SPECTROSC JI J. Electron Spectrosc. Relat. Phenom. PD APR 4 PY 1994 VL 67 IS 2 BP 373 EP 385 DI 10.1016/0368-2048(93)02061-P PG 13 WC Spectroscopy SC Spectroscopy GA NJ329 UT WOS:A1994NJ32900012 ER PT J AU SZCZUREK, A SPETH, J GARVEY, GT AF SZCZUREK, A SPETH, J GARVEY, GT TI MESON CLOUD IN THE NUCLEON AND (D)OVER-BAR-(U)OVER-BAR ASYMMETRY FROM THE DRELL-YAN PROCESSES SO NUCLEAR PHYSICS A LA English DT Article ID DEEP INELASTIC-SCATTERING; GOTTFRIED SUM-RULE; LIGHT-QUARK SEA; SYMMETRY-BREAKING; DIMUON PRODUCTION; FLAVOR ASYMMETRY; EXCHANGE MODEL; SMALL-X; DISTRIBUTIONS; DEPENDENCE AB Mesonic models predict violation of the SU(2) symmetry in the nucleon sea which seems to be necessary to explain the violation of the Gottfried sum rule. At the present time there is no generally accepted explanation of the effect. We find that careful analysis of the Drell-Yan processes in pp and pn collisions will provide complementary data to the Gottfried sum rule on the dBAR-uBAR asymmetry. We also find that some combinations of experimental results are insensitive to details of the mesonic models, offering the possibility to demonstrate the existence of the mesonic cloud in the nucleon. C1 INST NUCL PHYS, PL-31342 KRAKOW, POLAND. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RP SZCZUREK, A (reprint author), FORSCHUNGSZENTRUM JULICH, INST KERNPHYS, W-5170 JULICH, GERMANY. NR 45 TC 38 Z9 38 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD APR 4 PY 1994 VL 570 IS 3-4 BP 765 EP 781 DI 10.1016/0375-9474(94)90082-5 PG 17 WC Physics, Nuclear SC Physics GA NF374 UT WOS:A1994NF37400015 ER PT J AU FALK, AF GRINSTEIN, B AF FALK, AF GRINSTEIN, B TI (B)OVER-BAR-](K)OVER-BAR-E+E- IN CHIRAL PERTURBATION-THEORY SO NUCLEAR PHYSICS B LA English DT Article ID RADIATIVE-B-DECAYS; MESON AB The combined use of chiral SU(3) and heavy quark symmetries allows one to relate the hadronic form factors for the decay BBAR --> Ke+e-BAR to those for BBAR --> pie-nuBAR. We investigate departures from the symmetry limit which arise from chiral symmetry breaking. The analysis uses chiral perturbation theory and the heavy quark limit to compute the relevant hadronic matrix elements. We estimate the size of SU(3) corrections by computing, at one loop order, the leading nonanalytic dependence on the light quark masses. The calculation is trustworthy only in the portion of the Dalitz plot in which the momentum of the kaon or pion is small. We find the corrections to be approximately 40%. C1 JOHNS HOPKINS UNIV,DEPT PHYS & ASTRON,BALTIMORE,MD 21218. SUPERCONDUCTING SUPERCOLLIDER LAB,DALLAS,TX 75237. RP FALK, AF (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. RI Grinstein, Benjamin/H-5777-2015 OI Grinstein, Benjamin/0000-0003-2447-4756 NR 17 TC 29 Z9 29 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD APR 4 PY 1994 VL 416 IS 3 BP 771 EP 785 DI 10.1016/0550-3213(94)90554-1 PG 15 WC Physics, Particles & Fields SC Physics GA NH252 UT WOS:A1994NH25200005 ER PT J AU NEUBERT, M AF NEUBERT, M TI HEAVY HADRON WEAK DECAY FORM-FACTORS TO NEXT-TO-LEADING ORDER IN 1/M(Q) SO NUCLEAR PHYSICS B LA English DT Article ID EFFECTIVE FIELD-THEORY; QUARK EFFECTIVE THEORY; NOT-EQUAL INFINITY; MESONS; QCD; CURRENTS AB Based on the short-distance expansion of currents in the heavy quark effective theory, we derive the exact expressions for the heavy-to-heavy meson and baryon weak decay form factors to order 1/m(Q) in the heavy quark expansion, and to all orders in perturbation theory. We emphasize that the Wilson coefficients in this expansion depend on a kinematic variable wBAR that is different from the velocity transfer w = v.v' of the hadrons. Our results generalize existing ones obtained in the leading-logarithmic approximation. Some phenomenological applications are briefly discussed. RP NEUBERT, M (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 33 TC 14 Z9 14 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 APR 4 PY 1994 VL 416 IS 3 BP 786 EP 800 DI 10.1016/0550-3213(94)90555-X PG 15 WC Physics, Particles & Fields SC Physics GA NH252 UT WOS:A1994NH25200006 ER PT J AU RAITEN, E AF RAITEN, E TI TACHYON CONDENSATES AND STRING THEORETIC INFLATION SO NUCLEAR PHYSICS B LA English DT Article ID EXTENDED INFLATION; CURVED SPACE; BLACK-HOLES; COSMOLOGY; PROPAGATION; DIMENSIONS; VACUUM; TIME AB Cosmological solutions of the beta function equations for background fields of the closed bosonic string are investigated at the one-loop level. Following recent work of Kostelecky and Perry, it is assumed that the spatial sections of the space-time are conformally flat. Working in the sigma-model frame, the nontrivial tachyon potential is utilized to determine solutions with sufficient inflation to solve the smoothness and flatness problems. The graceful exit and density perturbation constraints can also be successfully implemented. RP RAITEN, E (reprint author), FERMILAB NATL ACCELERATOR LAB,THEORY GRP,MS106,POB 500,BATAVIA,IL 60510, USA. NR 38 TC 12 Z9 12 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 APR 4 PY 1994 VL 416 IS 3 BP 881 EP 894 DI 10.1016/0550-3213(94)90559-2 PG 14 WC Physics, Particles & Fields SC Physics GA NH252 UT WOS:A1994NH25200010 ER PT J AU BERN, Z CHALMERS, G DIXON, L KOSOWER, DA AF BERN, Z CHALMERS, G DIXON, L KOSOWER, DA TI ONE-LOOP N-GLUON AMPLITUDES WITH MAXIMAL HELICITY VIOLATION VIA COLLINEAR LIMITS SO PHYSICAL REVIEW LETTERS LA English DT Article ID GAUGE-THEORIES; MULTIPLE BREMSSTRAHLUNG; QCD AMPLITUDES; SUPERSYMMETRY AB We present a conjecture for the n-gluon one-loop amplitudes with maximal helicity violation. The conjecture emerges from the powerful requirement that the amplitudes have the correct behavior in the collinear limits of external momenta. One implication is that the corresponding amplitudes where three or more gluon legs are replaced by photons vanish for n > 4. C1 STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. CENS,SERV PHYS THEOR SACLAY,F-91191 GIF SUR YVETTE,FRANCE. RP BERN, Z (reprint author), UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024, USA. NR 29 TC 99 Z9 99 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 APR 4 PY 1994 VL 72 IS 14 BP 2134 EP 2137 DI 10.1103/PhysRevLett.72.2134 PG 4 WC Physics, Multidisciplinary SC Physics GA NE030 UT WOS:A1994NE03000003 ER PT J AU ABACHI, S ABBOTT, B ABOLINS, M ACHARYA, BS ADAM, I ADAMS, DL ADAMS, M AHN, S AIHARA, H ALVAREZ, G ALVES, GA AMOS, N ANDERSON, EW ANTIPOV, Y ARONSON, SH ASTUR, R AVERY, RE BADEN, A BALAMURALI, V BALDERSTON, J BALDIN, B BANTLY, J BARTLETT, JF BAZIZI, K BEHNKE, T BENDICH, J BERI, SB BEZZUBOV, V BHAT, PC BHATNAGAR, V BISWAS, N BLAZEY, G BLESSING, S BOEHNLEIN, A BORCHERDING, F BORDERS, J BOZKO, N BRANDT, A BROCK, R BROSS, A BUCHHOLZ, D BURTOVOI, V BUTLER, JM CALLOT, OH CASTILLAVALDEZ, H CHAKRABORTY, D CHEKULAEV, S CHEN, J CHEN, LP CHEN, W 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, M CUSSONNEAU, JP CUTTS, D DAHL, OI DE, K DEMARTEAU, M DEMINA, R DENISENKO, K DENISENKO, N DENISOV, D DENISOV, S DHARMARATNA, W DIEHL, HT DIESBURG, M DIXON, R DRAPER, P DUCROS, Y DURSTONJOHNSON, S EARTLY, D EDMUNDS, D EFIMOV, A ELLISON, J ELVIRA, VD ENGELMANN, R EPPLEY, G EROSHIN, O EVDOKIMOV, V FAHEY, S FANOURAKIS, G FATYGA, M FATYGA, MK FEATHERLY, J FEHER, S FEIN, D FERBEL, T FINOCCHIARO, G FISK, HE FLATTUM, E FORDEN, GE FORTNER, M FRANZINI, P FREDRIKSEN, S FUESS, S GAO, CS GELD, TL GENSER, K GERBER, CE GIBBARD, B GLEBOV, V GLICENSTEIN, JF GOBBI, B GOFORTH, M GOLDSCHMIDT, A GOMEZ, B GOOD, ML GORDON, H GRAF, N GRANNIS, PD GREEN, DR GREEN, J GREENLEE, H GROSSMAN, N GRUDBERG, P GRUNENDAHL, S GUIDA, JA GUIDA, JM GURYN, W HADLEY, NJ HAGGERTY, H HAGOPIAN, S HAGOPIAN, V HALL, RE HANSEN, S HAUPTMAN, JM HEDIN, D HEINSON, AP HEINTZ, U HEURING, T HIROSKY, R HOENEISEN, B HOFTUN, JS HU, T HUBBARD, JR HUEHN, T IGARASHI, S ITO, AS JAMES, E JAQUES, J JIANG, JZY JOFFEMINOR, T JOHNS, K JOHNSON, M JOHNSTAD, H JONCKHEERE, A JONES, M JOSTLEIN, H JUNG, CK KAHN, S KEHOE, R KELLY, M KERNAN, A KERTH, L KHOLODENKO, A KIRYUNIN, A KISTENEV, E KLATCHKO, A KLIMA, B KLOCHKOV, B KLOPFENSTEIN, C KLYUKHIN, V KOCHETKOV, V KOHLI, JM KOLTICK, D KOTCHER, J KOTOV, I KOURLAS, J KOZELOV, A KOZLOVSKY, E KRISHNASWAMY, MR KRZYWDZINSKI, S KUNORI, S LAMI, S LANDSBERG, G LANOU, RE LEEFRANZINI, J LI, H LI, J LI, RB LIDEMARTEAU, QZ LIMA, JGR LINN, SL LINNEMANN, J LIPTON, R LIU, YC LOBKOWICZ, F LOCH, P LOKEN, SC LOKOS, S LUEKING, L MACIEL, AKA MADARAS, RJ MADDEN, R MANGEOT, P MANNING, I MANSOULIE, B MAO, HS MARGULIES, S MARKELOFF, R MARKOSKY, L MARSHALL, T MARTIN, HJ MARTIN, MI MARTIN, PS MARX, M MAY, B MAYOROV, A MCCARTHY, R MCKIBBEN, T MCKINLEY, J MENG, XC MERRITT, KW MIETTINEN, H MILDER, A MILNER, C MINCER, A MONDAL, NK MONTGOMERY, HE MOONEY, P MUDAN, M MURPHY, C MURPHY, CT NANG, F NARAIN, M NARASIMHAM, VS NEAL, HA NEGRET, JP NEMETHY, P NESIC, D NORMAN, D OESCH, L OGURI, V OLTMAN, E OSHIMA, N OWEN, D PANG, M PARA, A PARK, CH PARTRIDGE, R PATERNO, M PERYSHKIN, A PETERS, M PI, B PIEKARZ, H PISCHALNIKOV, Y PIZZUTO, D PLUQUET, A PODSTAVKOV, V POPE, BG PROSPER, HB PROTOPOPESCU, S QUE, YK QUINTAS, PZ RAHALCALLOT, G RAJA, R RAJAGOPALAN, S RAO, MVS RASMUSSEN, L READ, AL REPOND, S REUCROFT, S RIADOVIKOV, V RIJSSENBEEK, M ROE, NA RUBINOV, P RUCHTI, R RUTHERFOORD, J SANTORO, A SAWYER, L SCHAMBERGER, RD SCHMID, D SCULLI, J SHKURENKOV, A SHUPE, M SINGH, JB SIROTENKO, V SKEENS, J SMART, W SMITH, A SMITH, D SMITH, RP SNOW, GR SNYDER, S SOLOMON, J SOOD, PM SOSEBEE, M SOUZA, M SPADAFORA, AL STEPHENS, R STEVENSON, ML STEWART, D STOCKER, F STOYANOVA, D STREETS, K STROVINK, M SUHANOV, A TAKETANI, A TARTAGLIA, M TEIGER, J THOMPSON, J TRIPPE, TG TUTS, PM VISHWANATH, PR VOLKOV, A VOROBIEV, A WAHL, HD WANG, DC WANG, LZ WARCHOL, J WAYNE, M WEERTS, H WENZEL, WA WHITE, A WHITE, JT WIGHTMAN, JA WILCOX, J WILLIS, S WIMPENNY, SJ WOLF, Z WOMERSLEY, J WOOD, DR XIA, Y XIAO, D XIE, PP XU, H YAMADA, R YAMIN, P YANAGISAWA, C YANG, J YANG, MJ YASUDA, T YOSHIKAWA, C YOUSSEF, S YU, J ZEITNITZ, C ZHANG, S ZHOU, YH ZHU, Q ZHU, YS ZIEMINSKA, D ZIEMINSKI, A ZINCHENKO, A ZYLBERSTEJN, A AF ABACHI, S ABBOTT, B ABOLINS, M ACHARYA, BS ADAM, I ADAMS, DL ADAMS, M AHN, S AIHARA, H ALVAREZ, G ALVES, GA AMOS, N ANDERSON, EW ANTIPOV, Y ARONSON, SH ASTUR, R AVERY, RE BADEN, A BALAMURALI, V BALDERSTON, J BALDIN, B BANTLY, J BARTLETT, JF BAZIZI, K BEHNKE, T BENDICH, J BERI, SB BEZZUBOV, V BHAT, PC BHATNAGAR, V BISWAS, N BLAZEY, G BLESSING, S BOEHNLEIN, A BORCHERDING, F BORDERS, J BOZKO, N BRANDT, A BROCK, R BROSS, A BUCHHOLZ, D BURTOVOI, V BUTLER, JM CALLOT, OH CASTILLAVALDEZ, H CHAKRABORTY, D CHEKULAEV, S CHEN, J CHEN, LP CHEN, W 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, M CUSSONNEAU, JP CUTTS, D DAHL, OI DE, K DEMARTEAU, M DEMINA, R DENISENKO, K DENISENKO, N DENISOV, D DENISOV, S DHARMARATNA, W DIEHL, HT DIESBURG, M DIXON, R DRAPER, P DUCROS, Y DURSTONJOHNSON, S EARTLY, D EDMUNDS, D EFIMOV, A ELLISON, J ELVIRA, VD ENGELMANN, R EPPLEY, G EROSHIN, O EVDOKIMOV, V FAHEY, S FANOURAKIS, G FATYGA, M FATYGA, MK FEATHERLY, J FEHER, S FEIN, D FERBEL, T FINOCCHIARO, G FISK, HE FLATTUM, E FORDEN, GE FORTNER, M FRANZINI, P FREDRIKSEN, S FUESS, S GAO, CS GELD, TL GENSER, K GERBER, CE GIBBARD, B GLEBOV, V GLICENSTEIN, JF GOBBI, B GOFORTH, M GOLDSCHMIDT, A GOMEZ, B GOOD, ML GORDON, H GRAF, N GRANNIS, PD GREEN, DR GREEN, J GREENLEE, H GROSSMAN, N GRUDBERG, P GRUNENDAHL, S GUIDA, JA GUIDA, JM GURYN, W HADLEY, NJ HAGGERTY, H HAGOPIAN, S HAGOPIAN, V HALL, RE HANSEN, S HAUPTMAN, JM HEDIN, D HEINSON, AP HEINTZ, U HEURING, T HIROSKY, R HOENEISEN, B HOFTUN, JS HU, T HUBBARD, JR HUEHN, T IGARASHI, S ITO, AS JAMES, E JAQUES, J JIANG, JZY JOFFEMINOR, T JOHNS, K JOHNSON, M JOHNSTAD, H JONCKHEERE, A JONES, M JOSTLEIN, H JUNG, CK KAHN, S KEHOE, R KELLY, M KERNAN, A KERTH, L KHOLODENKO, A KIRYUNIN, A KISTENEV, E KLATCHKO, A KLIMA, B KLOCHKOV, B KLOPFENSTEIN, C KLYUKHIN, V KOCHETKOV, V KOHLI, JM KOLTICK, D KOTCHER, J KOTOV, I KOURLAS, J KOZELOV, A KOZLOVSKY, E KRISHNASWAMY, MR KRZYWDZINSKI, S KUNORI, S LAMI, S LANDSBERG, G LANOU, RE LEEFRANZINI, J LI, H LI, J LI, RB LIDEMARTEAU, QZ LIMA, JGR LINN, SL LINNEMANN, J LIPTON, R LIU, YC LOBKOWICZ, F LOCH, P LOKEN, SC LOKOS, S LUEKING, L MACIEL, AKA MADARAS, RJ MADDEN, R MANGEOT, P MANNING, I MANSOULIE, B MAO, HS MARGULIES, S MARKELOFF, R MARKOSKY, L MARSHALL, T MARTIN, HJ MARTIN, MI MARTIN, PS MARX, M MAY, B MAYOROV, A MCCARTHY, R MCKIBBEN, T MCKINLEY, J MENG, XC MERRITT, KW MIETTINEN, H MILDER, A MILNER, C MINCER, A MONDAL, NK MONTGOMERY, HE MOONEY, P MUDAN, M MURPHY, C MURPHY, CT NANG, F NARAIN, M NARASIMHAM, VS NEAL, HA NEGRET, JP NEMETHY, P NESIC, D NORMAN, D OESCH, L OGURI, V OLTMAN, E OSHIMA, N OWEN, D PANG, M PARA, A PARK, CH PARTRIDGE, R PATERNO, M PERYSHKIN, A PETERS, M PI, B PIEKARZ, H PISCHALNIKOV, Y PIZZUTO, D PLUQUET, A PODSTAVKOV, V POPE, BG PROSPER, HB PROTOPOPESCU, S QUE, YK QUINTAS, PZ RAHALCALLOT, G RAJA, R RAJAGOPALAN, S RAO, MVS RASMUSSEN, L READ, AL REPOND, S REUCROFT, S RIADOVIKOV, V RIJSSENBEEK, M ROE, NA RUBINOV, P RUCHTI, R RUTHERFOORD, J SANTORO, A SAWYER, L SCHAMBERGER, RD SCHMID, D SCULLI, J SHKURENKOV, A SHUPE, M SINGH, JB SIROTENKO, V SKEENS, J SMART, W SMITH, A SMITH, D SMITH, RP SNOW, GR SNYDER, S SOLOMON, J SOOD, PM SOSEBEE, M SOUZA, M SPADAFORA, AL STEPHENS, R STEVENSON, ML STEWART, D STOCKER, F STOYANOVA, D STREETS, K STROVINK, M SUHANOV, A TAKETANI, A TARTAGLIA, M TEIGER, J THOMPSON, J TRIPPE, TG TUTS, PM VISHWANATH, PR VOLKOV, A VOROBIEV, A WAHL, HD WANG, DC WANG, LZ WARCHOL, J WAYNE, M WEERTS, H WENZEL, WA WHITE, A WHITE, JT WIGHTMAN, JA WILCOX, J WILLIS, S WIMPENNY, SJ WOLF, Z WOMERSLEY, J WOOD, DR XIA, Y XIAO, D XIE, PP XU, H YAMADA, R YAMIN, P YANAGISAWA, C YANG, J YANG, MJ YASUDA, T YOSHIKAWA, C YOUSSEF, S YU, J ZEITNITZ, C ZHANG, S ZHOU, YH ZHU, Q ZHU, YS ZIEMINSKA, D ZIEMINSKI, A ZINCHENKO, A ZYLBERSTEJN, A TI SEARCH FOR THE TOP-QUARK IN P(P)OVER-BAR COLLISIONS AT ROOT-S=1.8 TEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID HADRONIC COLLISIONS; CROSS-SECTION; MASS AB We have searched for evidence of top quark production in ppBAR collisions at square-root s = 1.8 TeV using the DO detector at the Fermilab Tevatron collider. For an integrated luminosity of 15 pb-1, we report results of a search for ttBAR pairs in the decay modes ttBAR --> emu + jets, ee + jets, e + jets, and mu + jets. From analyses of these modes we obtain a lower limit on the top quark mass of 131 GeV/c2 at the 95% confidence level, assuming standard model branching fractions and a predicted cross section for ttBAR production. We discuss the properties of an event for which expected backgrounds are small. C1 UNIV LOS ANDES,BOGOTA,COLOMBIA. BROOKHAVEN NATL LAB,UPTON,NY 11973. BROWN UNIV,PROVIDENCE,RI 02912. UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521. CTR BRASILEIRO PESQUISAS FIS,LAFEX,BR-20000 RIO JANEIRO,BRAZIL. CINVESTAV IPN,MEXICO CITY,MEXICO. COLUMBIA UNIV,NEW YORK,NY 10027. UNIV ARIZONA,TUCSON,AZ 85721. UNIV FLORIDA,GAINESVILLE,FL 32611. UNIV ILLINOIS,CHICAGO,IL 60680. UNIV HAWAII,HONOLULU,HI 96822. FLORIDA STATE UNIV,TALLAHASSEE,FL 32306. INDIANA UNIV,BLOOMINGTON,IN 47405. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV MARYLAND,COLL PK,MD 20742. UNIV MICHIGAN,ANN ARBOR,MI 48109. MICHIGAN STATE UNIV,E LANSING,MI 48824. NYU,NEW YORK,NY 10003. NORTHEASTERN UNIV,BOSTON,MA 02115. NO ILLINOIS UNIV,DE KALB,IL 60115. NORTHWESTERN UNIV,EVANSTON,IL 60208. UNIV NOTRE DAME,NOTRE DAME,IN 46556. UNIV PANJAB,CHANDIGARH 160014,INDIA. PROTVINO HIGH ENERGY PHYS INST,142284 PROTVINO,RUSSIA. PURDUE UNIV,W LAFAYETTE,IN 47907. RICE UNIV,HOUSTON,TX 77251. UNIV ROCHESTER,ROCHESTER,NY 14627. CENS,DEPT PHYS NUCL,F-91191 GIF SUR YVETTE,FRANCE. SUNY STONY BROOK,STONY BROOK,NY 11794. SSC LAB,DALLAS,TX 75237. TATA INST FUNDAMENTAL RES,BOMBAY 400005,INDIA. UNIV TEXAS,ARLINGTON,TX 76019. TEXAS A&M UNIV,COLLEGE STN,TX 77843. RP ABACHI, S (reprint author), FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. RI Aihara, Hiroaki/F-3854-2010; Klyukhin, Vyacheslav/D-6850-2012; De, Kaushik/N-1953-2013; Oguri, Vitor/B-5403-2013; Alves, Gilvan/C-4007-2013; Chekulaev, Sergey/O-1145-2015; Taketani, Atsushi/E-1803-2017 OI Aihara, Hiroaki/0000-0002-1907-5964; Klyukhin, Vyacheslav/0000-0002-8577-6531; De, Kaushik/0000-0002-5647-4489; Taketani, Atsushi/0000-0002-4776-2315 NR 29 TC 122 Z9 122 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 APR 4 PY 1994 VL 72 IS 14 BP 2138 EP 2142 DI 10.1103/PhysRevLett.72.2138 PG 5 WC Physics, Multidisciplinary SC Physics GA NE030 UT WOS:A1994NE03000004 ER PT J AU GAVIN, S GOCKSCH, A PISARSKI, RD AF GAVIN, S GOCKSCH, A PISARSKI, RD TI HOW TO MAKE LARGE DOMAINS OF DISORIENTED CHIRAL CONDENSATE SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGH-ENERGY; EMULSION CHAMBERS; SEARCH; COLLISIONS; FAMILIES; EVENTS AB Rajagopal and Wilczek have proposed that relativistic nuclear. collisions can generate domains in which the chiral condensate is disoriented. If sufficiently large (i.e., nucleus sized), such domains can yield measurable fluctuations in the number of neutral and charged pions. However, by numerical simulation of the zero-temperature two-flavor linear sigma model, we find that domains are essentially pion sized. Nevertheless, we show that large domains can occur if the effective mesons masses are much lighter. RP GAVIN, S (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,POB 5000,UPTON,NY 11973, USA. NR 24 TC 117 Z9 117 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 4 PY 1994 VL 72 IS 14 BP 2143 EP 2146 DI 10.1103/PhysRevLett.72.2143 PG 4 WC Physics, Multidisciplinary SC Physics GA NE030 UT WOS:A1994NE03000005 ER PT J AU HU, YC ECKE, RE AHLERS, G AF HU, YC ECKE, RE AHLERS, G TI BEHAVIOR OF FOCUS PATTERNS IN LOW PRANDTL NUMBER CONVECTION SO PHYSICAL REVIEW LETTERS LA English DT Article ID RAYLEIGH-BENARD CONVECTION; WAVE-VECTOR FIELD; CYLINDRICAL CONTAINER; FLOW PATTERNS; THRESHOLD; TURBULENCE; SELECTION; DYNAMICS; ROLLS; ONSET AB We present experimental results on the dynamics of concentric-roll and textured patterns in a convecting fluid of Prandtl number about 1 and with radius-to-height ratio near 40 and for epsilon = DELTAT/DELTAT(c) - 1 less-than-or-equal-to 0.8. At epsilon = 0.21, the concentric-roll state was lost by the pattern center moving to the wall while nucleating new rolls which traveled outward. The textured pattern contained sidewall foci which also emitted traveling waves. The average frequency of the emission increased linearly with epsilon, but then increased rapidly by about 40% at epsilon almost-equal-to 0.65 where spiral defects appeared. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. UNIV CALIF SANTA BARBARA,CTR NONLINEAR STUDIES,SANTA BARBARA,CA 93106. RP HU, YC (reprint author), LOS ALAMOS NATL LAB,DIV MAT,LOS ALAMOS,NM 87545, USA. OI Ecke, Robert/0000-0001-7772-5876 NR 27 TC 26 Z9 26 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 APR 4 PY 1994 VL 72 IS 14 BP 2191 EP 2194 DI 10.1103/PhysRevLett.72.2191 PG 4 WC Physics, Multidisciplinary SC Physics GA NE030 UT WOS:A1994NE03000017 ER PT J AU CHEN, CP DAVIDSON, RC AF CHEN, CP DAVIDSON, RC TI NONLINEAR RESONANCES AND CHAOTIC BEHAVIOR IN A PERIODICALLY FOCUSED INTENSE CHARGED-PARTICLE BEAM SO PHYSICAL REVIEW LETTERS LA English DT Article ID EMITTANCE AB It is shown that beam self-field effects induce nonlinear resonances and chaotic behavior in the envelope oscillations of an intense charged-particle beam propagating through a periodic focusing field. The resonance condition is derived and expressed in terms of the vacuum phase advance and the beam perveance. Certain correlations are found between such resonant and chaotic behavior and well-known instabilities in periodically focused high-current ion beams. The predicted nonlinear resonances and chaotic behavior are expected to be observable in beam transport experiments in which there is a mismatch between the beam and the periodic focusing field. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543. RP CHEN, CP (reprint author), MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139, USA. NR 13 TC 66 Z9 73 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 4 PY 1994 VL 72 IS 14 BP 2195 EP 2198 DI 10.1103/PhysRevLett.72.2195 PG 4 WC Physics, Multidisciplinary SC Physics GA NE030 UT WOS:A1994NE03000018 ER PT J AU KIM, J BURRELL, KH GOHIL, P GROEBNER, RJ KIM, YB STJOHN, HE SERAYDARIAN, RP WADE, MR AF KIM, J BURRELL, KH GOHIL, P GROEBNER, RJ KIM, YB STJOHN, HE SERAYDARIAN, RP WADE, MR TI ROTATION CHARACTERISTICS OF MAIN IONS AND IMPURITY IONS IN H-MODE TOKAMAK PLASMA SO PHYSICAL REVIEW LETTERS LA English DT Article ID EDGE ELECTRIC-FIELD; DIII-D TOKAMAK; POLOIDAL ROTATION; TRANSITION; TURBULENCE; CONFINEMENT; BIFURCATION; TRANSPORT; ASDEX AB Poloidal and toroidal rotation of the main ions (He-2+) and the impurity ions (C6+ and B5+) in H-mode helium plasmas have been measured via charge exchange recombination spectroscopy in the DIII-D tokamak. It was discovered that the main ion poloidal rotation is in the ion diamagnetic drift direction while the impurity ion rotation is in the electron diamagnetic drift direction, in qualitative agreement with the neoclassical theory. The deduced radial electric field in the edge is of the same negative-well shape regardless of which ion species is used, validating the fundamental nature of the electric field in L-H transition phenomenology. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP KIM, J (reprint author), GEN ATOM,SAN DIEGO,CA 92186, USA. NR 28 TC 137 Z9 139 U1 1 U2 9 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 APR 4 PY 1994 VL 72 IS 14 BP 2199 EP 2202 DI 10.1103/PhysRevLett.72.2199 PG 4 WC Physics, Multidisciplinary SC Physics GA NE030 UT WOS:A1994NE03000019 ER PT J AU LIN, MY SINHA, SK DRAKE, JM WU, XI THIYAGARAJAN, P STANLEY, HB AF LIN, MY SINHA, SK DRAKE, JM WU, XI THIYAGARAJAN, P STANLEY, HB TI STUDY OF PHASE-SEPARATION OF A BINARY-FLUID MIXTURE IN CONFINED GEOMETRY SO PHYSICAL REVIEW LETTERS LA English DT Article ID RANDOM-FIELD TRANSITION; POROUS-MEDIUM; ISING-MODEL; SILICA-GEL; LIQUID; DYNAMICS AB Small angle neutron scattering experiments were performed to measure the structure factor S(q) for a binary fluid water/lutidine mixture imbibed inside porous Vycor glass at concentrations both near and away from critical. In both cases, the results can be interpreted as a combination of a lutidine-rich wetting layer coating the internal surfaces of Vycor and random single-phase domain growth with temperature. This result does not support the random field Ising model predictions for the phase separation behavior, but is in good agreement with theories based on pore confinement of the imbibed fluid mixture. C1 EXXON RES & ENGN CO,ANNANDALE,NJ 08801. UNIV PITTSBURGH,PITTSBURGH,PA 15261. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV MARYLAND,COLL PK,MD 20742. NR 22 TC 85 Z9 85 U1 1 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 APR 4 PY 1994 VL 72 IS 14 BP 2207 EP 2210 DI 10.1103/PhysRevLett.72.2207 PG 4 WC Physics, Multidisciplinary SC Physics GA NE030 UT WOS:A1994NE03000021 ER PT J AU HAMILTON, WA BUTLER, PD BAKER, SM SMITH, GS HAYTER, JB MAGID, LJ PYNN, R AF HAMILTON, WA BUTLER, PD BAKER, SM SMITH, GS HAYTER, JB MAGID, LJ PYNN, R TI SHEAR-INDUCED HEXAGONAL ORDERING OBSERVED IN AN IONIC VISCOELASTIC FLUID IN FLOW PAST A SURFACE SO PHYSICAL REVIEW LETTERS LA English DT Article ID ANGLE NEUTRON-SCATTERING; POLYELECTROLYTE AB We present the first clear evidence of a shear induced hexagonal phase in a polyionic fluid in flow past a plane quartz surface. The dilute surfactant solution studied is viscoelastic due to the formation and entanglement of highly extended charged threadlike micelles many thousands of A long, which arc known to align along the flow direction under shear. Small-angle neutron diffraction data show that in the high shear region within a few tens of microns of the surface these micelles not only align, but form a remarkably well ordered hexagonal array separated by 370 angstrom, 8 times their 46 angstrom diameter. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. LOS ALAMOS NATL LAB,MANUEL LUJAN JR NEUTRON SCATTERING CTR,LOS ALAMOS,NM 87545. UNIV KENTUCKY,DEPT CHEM,LEXINGTON,KY 40506. RP HAMILTON, WA (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI Butler, Paul/D-7368-2011; Smith, Gregory/D-1659-2016 OI Smith, Gregory/0000-0001-5659-1805 NR 19 TC 58 Z9 58 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 APR 4 PY 1994 VL 72 IS 14 BP 2219 EP 2222 DI 10.1103/PhysRevLett.72.2219 PG 4 WC Physics, Multidisciplinary SC Physics GA NE030 UT WOS:A1994NE03000024 ER PT J AU DUBON, OD BEEMAN, JW FALICOV, LM FUCHS, HD HALLER, EE WANG, C AF DUBON, OD BEEMAN, JW FALICOV, LM FUCHS, HD HALLER, EE WANG, C TI COPPER ACCEPTORS IN UNIAXIALLY STRESSED GERMANIUM - 1S(3) TO 1S(2) 2S(1) GROUND-STATE TRANSFORMATION SO PHYSICAL REVIEW LETTERS LA English DT Article AB We have studied uniaxially stressed Ge doped with Cu, a substitutional triple acceptor, by photoconductivity spectroscopy. We find that the ground state of this triple acceptor, normally accommodating three 1s holes, reconfigures into an atomic Li-like 1s(2)2s1 arrangement by the application of [100] stress. Above 4 kbar the first ionization potential reaches a constant value of 17.4 meV corresponding to the hole excitation from the now partially occupied 2s energy level. Excellent agreement was obtained between the experimental results and variational calculations. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP DUBON, OD (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. NR 15 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 4 PY 1994 VL 72 IS 14 BP 2231 EP 2234 DI 10.1103/PhysRevLett.72.2231 PG 4 WC Physics, Multidisciplinary SC Physics GA NE030 UT WOS:A1994NE03000027 ER PT J AU LINGLE, RL PADOWITZ, DF JORDAN, RE MCNEILL, JD HARRIS, CB AF LINGLE, RL PADOWITZ, DF JORDAN, RE MCNEILL, JD HARRIS, CB TI 2-DIMENSIONAL LOCALIZATION OF ELECTRONS AT INTERFACES SO PHYSICAL REVIEW LETTERS LA English DT Article ID IMAGE-POTENTIAL STATES; 2-PHOTON PHOTOEMISSION; SURFACE; FILMS; MOBILITY; SYSTEMS; FLUIDS AB Evidence for electron localization in 2D at metal-dielectric interfaces is reported. A nondispersive peak, derived from the image-potential state and observed in angle-resolved two-photon photoemission, is assigned to localized excess electrons. The image electron on alkane monolayers is a free electron. Bilayers of chain or ring alkanes show both localized and delocalized states; electrons are localized on trilayer n-pentane. Bilayers and trilayers of neopentane show no localization. Our results link the geometry of adlayer molecules with localization of excess electrons at interfaces. C1 LAWRENCE BERKELEY LAB, DIV CHEM SCI, BERKELEY, CA 94720 USA. RP LINGLE, RL (reprint author), UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. RI McNeill, Jason/E-5389-2011 NR 24 TC 42 Z9 42 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 4 PY 1994 VL 72 IS 14 BP 2243 EP 2246 DI 10.1103/PhysRevLett.72.2243 PG 4 WC Physics, Multidisciplinary SC Physics GA NE030 UT WOS:A1994NE03000030 ER PT J AU KUNCHUR, MN CHRISTEN, DK KLABUNDE, CE PHILLIPS, JM AF KUNCHUR, MN CHRISTEN, DK KLABUNDE, CE PHILLIPS, JM TI HALL-EFFECT IN YBA2CU3O7-DELTA IN THE LIMIT OF FREE FLUX-FLOW SO PHYSICAL REVIEW LETTERS LA English DT Article ID THIN-FILMS; VORTEX MOTION; SUPERCONDUCTORS; LAALO3(100); TRANSITION AB The Hall effect of an YBa2Cu3O7-delta epitaxial film was studied using high pulsed current densities J to suppress flux pinning and reveal intrinsic behavior in the free-flux-flow limit. With increasing J there is an enhancement of the anomalous sign reversal, inconsistent with mechanisms based on pinning and inhomogeneity. At high H and J the Hall angle a appears to decompose into alpha = alpha(M) + alpha(n); alpha(M)(T) saturates to a negative value independent of H and J, and alpha(n) (is-proportional-to H) has the normal-state value. The results are consistent with time-dependent Ginzburg-Landau calculations. C1 AT&T BELL LABS, MURRAY HILL, NJ 07974 USA. RP OAK RIDGE NATL LAB, DIV SOLID STATE, POB 2008, OAK RIDGE, TN 37831 USA. RI Christen, David/A-9709-2008 NR 31 TC 51 Z9 51 U1 0 U2 4 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 4 PY 1994 VL 72 IS 14 BP 2259 EP 2262 DI 10.1103/PhysRevLett.72.2259 PG 4 WC Physics, Multidisciplinary SC Physics GA NE030 UT WOS:A1994NE03000034 ER PT J AU BILLINGE, SJL KWEI, GH TAKAGI, H AF BILLINGE, SJL KWEI, GH TAKAGI, H TI LOCAL OCTAHEDRAL TILTS IN LA2-XBAXCUO4 - EVIDENCE FOR A NEW STRUCTURAL LENGTH SCALE SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGH-TC SUPERCONDUCTIVITY; LA2-XSRXCUO4; BEHAVIOR; LA2CUO4 AB The short-range structure in La2-xBaxCuO4 is examined by obtaining the pair distribution function from neutron powder diffraction data. In contrast to the predictions of the crystal structure models, locally, the CuO6 octahedra do not change their tilt direction at the low-temperature tetragonal (LTT) to low-temperature orthorhombic (LTO) phase transition: they always tilt in the [110] (LTT) directions. The long-range structures of the high-temperature phases result from coherent superpositions of the local LTT variants. The local tilt order extends over approximately 1 nm. We discuss the implications of this local structure for the properties. C1 UNIV TOKYO,DEPT APPL PHYS,BUNKYO KU,TOKYO 113,JAPAN. RP BILLINGE, SJL (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Takagi, Hidenori/B-2935-2010 NR 22 TC 81 Z9 81 U1 2 U2 16 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 APR 4 PY 1994 VL 72 IS 14 BP 2282 EP 2285 DI 10.1103/PhysRevLett.72.2282 PG 4 WC Physics, Multidisciplinary SC Physics GA NE030 UT WOS:A1994NE03000040 ER PT J AU HULEN, JB GOFF, F ROSS, JR BORTZ, LC BERESKIN, SR AF HULEN, JB GOFF, F ROSS, JR BORTZ, LC BERESKIN, SR TI GEOLOGY AND GEOTHERMAL ORIGIN OF GRANT-CANYON AND BACON-FLAT OIL-FIELDS, RAILROAD-VALLEY, NEVADA SO AAPG BULLETIN-AMERICAN ASSOCIATION OF PETROLEUM GEOLOGISTS LA English DT Article ID RESERVOIRS; PETROLEUM; SYSTEMS; CALDERA; GULF; USA AB Eastern Nevada's Grant Canyon and Bacon Flat oil fields show strong evidence of formation in a still-active, moderate-temperature geothermal system. Modern manifestations of this system include unusually elevated oil-reservoir temperature at shallow depth, 116-122 degrees C at 1.1-1.6 km, and dilute Na-HCO3-Cl thermal waters directly associated with hot oil. Hydrogen and oxygen isotopic compositions indicate that these thermal waters are meteoric in origin, but were probably recharged prior to the Holocene (before 10 ka). The waters apparently ascended to oil-reservoir elevations after deep heating in response to the normal regional thermal gradient; there is no evidence for a modern magmatic heat source. The beginning of oil-reservoir evolution at both fields is recorded by late-stage, fracture-filling quartz in the vuggy, brecciated, Paleozoic dolostone reservoir rocks. Oil and aqueous solutions were trapped as fluid inclusions in the quartz at temperatures com parable to those now prevailing in the reservoirs. Apparent salinities of the aqueous inclusions closely match the actual concentrations of current oil-field waters, and the quartz has the oxygen isotopic composition predicted for its crystallization from these waters at contemporary temperatures. Present-day and fluid-inclusion temperatures define essentially coincident isothermal profiles through and beneath the oil-reservoir interval, a phenomenon consistent with near-constant convective heat transfer since inception of the geothermal system. Textural and mineralogic clues indicate that hot waters circulating in this system also increased porosity by dissolving carbonate minerals, and helped seal reservoir margins by precipitating silica and kaolin. More importantly, the rising thermal waters may have aided oil transport and accelerated source-rock maturation through an increase in the shallow (< 3 km) local thermal budget. Along with the aforementioned fluid-inclusion and isotopic evidence, radiometrically dated life spans for numerous extinct geothermal systems (epithermal ore deposits) in the Basin and Range make it likely that the Grant Canyon-Bacon Flat system and associated oil reservoirs are no older than 2.5 Ma. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. APACHE CORP,DENVER,CO 80203. ADVANTAGE RESOURCES,DENVER,CO 80203. TERRA TEK INC,SALT LAKE CITY,UT 84108. RP HULEN, JB (reprint author), UNIV UTAH,RES INST,EARTH SCI LAB DIV,391-C CHIPETA WAY,SALT LAKE CITY,UT 84108, USA. NR 98 TC 33 Z9 38 U1 0 U2 1 PU AMER ASSOC PETROLEUM GEOLOGIST PI TULSA PA 1444 S BOULDER AVE, PO BOX 979, TULSA, OK 74101 SN 0149-1423 J9 AAPG BULL JI AAPG Bull.-Am. Assoc. Petr. Geol. PD APR PY 1994 VL 78 IS 4 BP 596 EP 623 PG 28 WC Geosciences, Multidisciplinary SC Geology GA NE063 UT WOS:A1994NE06300005 ER PT J AU ELMER, JW AZIZ, MJ TANNER, LE SMITH, PM WALL, MA AF ELMER, JW AZIZ, MJ TANNER, LE SMITH, PM WALL, MA TI FORMATION OF BANDS OF ULTRAFINE BERYLLIUM PARTICLES DURING RAPID SOLIDIFICATION OF AL-BE ALLOYS - MODELING AND DIRECT OBSERVATIONS SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID AG-CU ALLOYS; MICROSTRUCTURE; NUCLEATION; GROWTH AB Rapid solidification of dilute hyper-eutectic and monotectic alloys sometimes produces a dispersion of ultrafine randomly-oriented particles that lie in arrays parallel to the advancing solidification front. We characterize this effect in Al-Be where Be-rich particles with diameters on the order of 10 nm form in arrays spaced approximately 25 nm apart, and we present a model of macroscopically steady state but microscopically oscillatory motion of the solidification front to explain this unusual microstructure. The proposed mechanism involves; (i) the build-up of rejected solute in a diffusional boundary layer which slows down the growing crystal matrix, (ii) the boundary layer composition entering a metastable liquid miscibility gap, (iii) homogeneous nucleation of solute rich liquid droplets in the boundary layer, and crystallization of these droplets, and (iv) growth of the matrix past the droplets and its reformation into a planar interface. The size of the Be-rich particles is limited by the beryllium supersaturation in the diffusional boundary layer. A numerical model was developed to investigate this solidification mechanism, and the results of the model are in good agreement with experimental observations of rapidly solidified Al-5 at.% Be. C1 HARVARD UNIV, DIV APPL SCI, CAMBRIDGE, MA 02138 USA. RP ELMER, JW (reprint author), LAWRENCE LIVERMORE NATL LAB, DEPT CHEM & MAT SCI, POB 808, LIVERMORE, CA 94551 USA. NR 30 TC 17 Z9 21 U1 2 U2 3 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 APR PY 1994 VL 42 IS 4 BP 1065 EP 1080 DI 10.1016/0956-7151(94)90124-4 PG 16 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NA125 UT WOS:A1994NA12500002 ER PT J AU GENIN, FY MULLINS, WW WYNBLATT, P AF GENIN, FY MULLINS, WW WYNBLATT, P TI CAPILLARY INSTABILITIES IN POLYCRYSTALLINE METALLIC FOILS - EXPERIMENTAL-OBSERVATIONS OF THERMAL PITTING IN NICKEL SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID THIN-FILMS AB Interference microscopy has been used to measure the surface profile of a thermal pit at the intersection of three grain boundaries on the surface of an annealed nickel foil. The experimentally obtained profile is compared with the predictions of a recently developed model of thermal pitting at grain boundary vertices by surface diffusion. This comparison indicates reasonable agreement between experimental observations and theoretical predictions. C1 CARNEGIE MELLON UNIV, DEPT MAT SCI & ENGN, PITTSBURGH, PA 15213 USA. RP GENIN, FY (reprint author), LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 13 TC 8 Z9 8 U1 1 U2 5 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 APR PY 1994 VL 42 IS 4 BP 1489 EP 1492 DI 10.1016/0956-7151(94)90167-8 PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NA125 UT WOS:A1994NA12500045 ER PT J AU BROWNING, ND CHISHOLM, MF PENNYCOOK, SJ AF BROWNING, ND CHISHOLM, MF PENNYCOOK, SJ TI ATOMIC-RESOLUTION CHEMICAL-ANALYSIS SO ADVANCED MATERIALS LA English DT Article ID VISIBILITY; CRYSTALS; SILICON; STEM RP BROWNING, ND (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. OI Browning, Nigel/0000-0003-0491-251X NR 18 TC 1 Z9 1 U1 0 U2 6 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0935-9648 J9 ADV MATER JI Adv. Mater. PD APR PY 1994 VL 6 IS 4 BP 328 EP 331 DI 10.1002/adma.19940060418 PG 4 WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Chemistry; Science & Technology - Other Topics; Materials Science; Physics GA NE867 UT WOS:A1994NE86700016 ER PT J AU SMITH, M AF SMITH, M TI THERMAL SPRAY DIVISION SO ADVANCED MATERIALS & PROCESSES LA English DT Editorial Material RP SMITH, M (reprint author), SANDIA NATL LABS,THERMAL SPRAY RES LAB,TECH STAFF,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 0026-0665 J9 ADV MATER PROCESS JI Adv. Mater. Process. PD APR PY 1994 VL 145 IS 4 BP 54 EP 55 PG 2 WC Materials Science, Multidisciplinary SC Materials Science GA PD184 UT WOS:A1994PD18400009 ER PT J AU SASSE, AGBM NAZAROFF, WW GADGIL, AJ AF SASSE, AGBM NAZAROFF, WW GADGIL, AJ TI PARTICLE FILTER BASED ON THERMOPHORETIC DEPOSITION FROM NATURAL-CONVECTION FLOW SO AEROSOL SCIENCE AND TECHNOLOGY LA English DT Article ID BOUNDARY-LAYER; FLAT-PLATE; LAMINAR AB We present an analysis of particle migration in a natural convection flow between parallel plates and within the annulus of concentric tubes. The flow channel is vertically oriented with one surface maintained at a higher temperature than the other. Particle migration is dominated by advection in the vertical direction and thermophoresis in the horizontal direction. From scale analysis it is demonstrated that particles are completely removed from air flowing through the channel if its length exceeds L(c) = (b4g/24K v2), where b is the width of the channel, g is the acceleration of gravity, K is a thermophoretic coefficient of order 0.5, and v is the kinematic viscosity of air. Precise predictions of particle removal efficiency as a function of system parameters are obtained by numerical solution of the governing equations. Based on the model results, it appears feasible to develop a practical filter for removing smoke particles from a smoldering cigarette in an ashtray by using natural convection in combination with thermophoresis. C1 UNIV CALIF BERKELEY,DEPT CIVIL ENGN,633 DAVIS HALL,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,INDOOR ENVIRONM PROGRAM,BERKELEY,CA 94720. RI Nazaroff, William/C-4106-2008; OI Nazaroff, William/0000-0001-5645-3357; Gadgil, Ashok/0000-0002-0357-9455 NR 22 TC 25 Z9 25 U1 1 U2 2 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0278-6826 J9 AEROSOL SCI TECH JI Aerosol Sci. Technol. PD APR PY 1994 VL 20 IS 3 BP 227 EP 238 DI 10.1080/02786829408959679 PG 12 WC Engineering, Chemical; Engineering, Mechanical; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA NL894 UT WOS:A1994NL89400001 ER PT J AU TU, KW KNUTSON, EO GEORGE, AC AF TU, KW KNUTSON, EO GEORGE, AC TI THORON VERSUS RADON - COMPARISON OF MEASURED PROGENY AEROSOL-SIZE DISTRIBUTIONS SO AEROSOL SCIENCE AND TECHNOLOGY LA English DT Article ID DECAY PRODUCTS; PARTICLE-SIZE; INDOOR; RN-220; EXPOSURES; DAUGHTERS; PB-212 AB A review of the literature showed that measurements of the comparative size of radon and thoron progeny have yielded mixed results. On the other hand, a theoretical analysis showed that differences might be expected in certain circumstances. Therefore, we reviewed our archived and recent measurements of radon progeny particle size to see if information on thoron progeny particle size can be extracted. The data reviewed include tests done in our 20 m 3 radon test chamber and in three single-family houses in New Jersey. To determine if there were significant differences in the radon and thoron progeny particle size, a Monte Carlo error analysis was carried out on these test data. From these studies we conclude that the difference between radon and thoron progeny particle size is too small to be measured. RP TU, KW (reprint author), US DOE,ENVIRONM MEASUREMENTS LAB,NEW YORK,NY 10014, USA. NR 31 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0278-6826 J9 AEROSOL SCI TECH JI Aerosol Sci. Technol. PD APR PY 1994 VL 20 IS 3 BP 266 EP 274 DI 10.1080/02786829408959682 PG 9 WC Engineering, Chemical; Engineering, Mechanical; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA NL894 UT WOS:A1994NL89400004 ER PT J AU FELINGER, A GUIOCHON, G AF FELINGER, A GUIOCHON, G TI OPTIMIZING EXPERIMENTAL CONDITIONS FOR MINIMUM PRODUCTION COST IN PREPARATIVE CHROMATOGRAPHY SO AICHE JOURNAL LA English DT Article ID COLUMN DESIGN PARAMETERS; DISPLACEMENT CHROMATOGRAPHY; ELUTION CHROMATOGRAPHY; OVERLOADED ELUTION; OPTIMIZATION; ISOTHERM; MODEL AB Optimum experimental conditions and column design parameters are calculated for most economical separation of binary mixtures by preparative liquid chromatography. The solvent consumption and capital costs are regarded as the two major cost contributions. Calculations were performed by using the numerical solution of the equilibrium-dispersive model of chromatography and a nonlinear simplex algorithm. Solvent consumption depends only on the column efficiency, the retention factor, and the loa&ng factor. The production rate depends on the particle size, the column length, the mobile-phase flow velocity, the retention and the loading factors, and can be optimized with or without recovery yield constraints. A hybrid objective function was constructed to find the tradeoffs between the production rate and the solvent consumption. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. RI Felinger, Attila/A-1595-2008 OI Felinger, Attila/0000-0001-7130-1968 NR 14 TC 46 Z9 46 U1 0 U2 3 PU AMER INST CHEMICAL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0001-1541 J9 AICHE J JI AICHE J. PD APR PY 1994 VL 40 IS 4 BP 594 EP 605 DI 10.1002/aic.690400404 PG 12 WC Engineering, Chemical SC Engineering GA NE871 UT WOS:A1994NE87100003 ER PT J AU ZERRES, H PRAUSNITZ, JM AF ZERRES, H PRAUSNITZ, JM TI THERMODYNAMICS OF PHASE-EQUILIBRIA IN AQUEOUS-ORGANIC SYSTEMS WITH SALT SO AICHE JOURNAL LA English DT Article ID VAPOR-LIQUID-EQUILIBRIA; MEAN SPHERICAL APPROXIMATION; SOLVENT ELECTROLYTE-SOLUTIONS; MIXED-SOLVENT; ACTIVITY-COEFFICIENTS; OSMOTIC COEFFICIENTS; CALCIUM-CHLORIDE; SODIUM-CHLORIDE; IONIC-SOLUTIONS; GAS-PHASE AB A semiempirical thermodynamic method is developed to establish a framework for calculating vapor-liquid and liquid-liquid equilibria in ternary systems containing water, an organic solvent, and a salt. Careful attention is given to precise definition of standard states. Short-range ion-solvent forces are taken into account primarily by a chemical-equilibrium method based on stepwise ion solvation; ho wever, physical contributions also contribute. Water-cosolvent nonideality is described by an extended equation of the van Laar form. Long-range electrostatic forces between ions are taken into account by an extended Debye-Huckel equation with corrections for transferring from a McMillan-Mayer to a Lewis-Randall framework. The new method is illustrated with results for several systems including saturated aqueous mixtures of LiBr or LiCl with methanol where the salt concentration exceeds 20 molal. The method developed here is of particular interest for process calculations in extractive crystallization, a low-energy operation for producing salt from aqueous solution. RP ZERRES, H (reprint author), LAWRENCE BERKELEY LAB,DEPT CHEM ENGN,DIV CHEM SCI,BERKELEY,CA 94720, USA. NR 84 TC 88 Z9 91 U1 1 U2 15 PU AMER INST CHEMICAL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0001-1541 J9 AICHE J JI AICHE J. PD APR PY 1994 VL 40 IS 4 BP 676 EP 691 DI 10.1002/aic.690400411 PG 16 WC Engineering, Chemical SC Engineering GA NE871 UT WOS:A1994NE87100010 ER PT J AU GHIO, AJ STONEHUERNER, J QUIGLEY, DR AF GHIO, AJ STONEHUERNER, J QUIGLEY, DR TI HUMIC-LIKE SUBSTANCES IN CIGARETTE-SMOKE CONDENSATE AND LUNG-TISSUE OF SMOKERS SO AMERICAN JOURNAL OF PHYSIOLOGY LA English DT Article DE IRON; IRON CHELATES; TOBACCO; FREE RADICALS; HUMATES ID RADICAL FORMATION; IRON; ACID; INHIBITOR; RELEASE AB Deposition of pigmented matter in the lower respiratory tract correlates with the extent of emphysema in smokers as well as with free radical generation and iron accumulation. Pulmonary emphysema is postulated to be mediated by free radical generation which is either directly or indirectly associated with cigarette smoke exposure. The hypothesis was tested that 1) incomplete combustion of tobacco yields humic-like substances (HLS) which 2) deposit in the lung as pigmented particulates, 3) complex iron cations in vitro and in vivo, and 4) have a capacity to catalyze oxidant formation. HLS, isolated by alkali extraction of cigarette smoke condensate (CSC) (Tobacco Health Research Institute, University of Kentucky), demonstrated a high carbon and low carboxylate content on elemental and functional group analyses, respectively, compared with values for HLS sequestered from soils. The HLS isolated from CSC had a capacity to complex iron in vitro and accumulated the metal in vivo after intratracheal instillation in an animal model. Both HLS and its iron complex generated free radicals, and some portion of this oxidant generation was metal dependent. Lung tissue collected at autopsy from smokers contained HLS with an infrared spectrum almost identical to that of the material isolated from CSC. Associations between particulate deposition, metal accumulation, and free radical generation suggest a possible role of HLS in the induction of lung disease following cigarette exposure. C1 DUKE UNIV,MED CTR,DEPT MED,DIV ALLERGY CRIT CARE & RESP MED,DURHAM,NC 27710. IDAHO NATL ENGN LAB,BIOTECHNOL UNIT,IDAHO FALLS,ID 83415. RP GHIO, AJ (reprint author), DUKE UNIV,MED CTR,DURHAM VET AFFAIRS MED CTR,BOX 3177,DURHAM,NC 27710, USA. FU NHLBI NIH HHS [HL-02655] NR 37 TC 22 Z9 22 U1 0 U2 0 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0002-9513 J9 AM J PHYSIOL JI Am. J. Physiol. PD APR PY 1994 VL 266 IS 4 BP L382 EP L388 PN 1 PG 7 WC Physiology SC Physiology GA NJ994 UT WOS:A1994NJ99400079 PM 8179015 ER PT J AU STILES, J BUYUKMIHCI, NC FARVER, TB AF STILES, J BUYUKMIHCI, NC FARVER, TB TI TONOMETRY OF NORMAL EYES IN RAPTORS SO AMERICAN JOURNAL OF VETERINARY RESEARCH LA English DT Article ID 2 APPLANATION TONOMETERS; HORSES; DOGS; CATS AB An applanation tonometer was used to estimate intraocular pressure in normal eyes of several species of raptors. No bird had active injury or illness, though some were nonreleasable to the wild because of previous injury, Mean (+/- SD) intraocular pressure was 20.6 (+/- 3.4) mm of Hg in red-tailed hawks (Buteo jamaicensis, n = 10), 20.8 (+/- 2.3) mm of Hg in Swainson's hawks (Buteo swainsoni, n = 6), 21.5 (+/- 3.0) mm of Kg in golden eagles (Aquila chrysaetos, n = 7), 20.6 (+/- 2.0) mm of Hg in bald eagles (Haliaeetus leucocephalus, n = 3), and 10.8 (+/- 3.6) mm of Hg in great horned owls (Bubo virginianus, n = 6). There was no significant difference in intraocular pressure between hawks and eagles. Mean pressure in great horned owls was significantly (P < 0.01) lower than pressure in hawks or eagles. Reliable intraocular pressure readings could not be obtained in barn owls (Tyto alba). C1 LAWRENCE LIVERMORE NATL LAB,SCH VET MED,DEPT SURG,DAVIS,CA 95616. LAWRENCE LIVERMORE NATL LAB,SCH VET MED,DEPT EPIDEMIOL & PREVENT MED,DAVIS,CA 95616. NR 14 TC 40 Z9 40 U1 0 U2 1 PU AMER VETERINARY MEDICAL ASSOC PI SCHAUMBURG PA 1931 N MEACHAM RD SUITE 100, SCHAUMBURG, IL 60173-4360 SN 0002-9645 J9 AM J VET RES JI Am. J. Vet. Res. PD APR PY 1994 VL 55 IS 4 BP 477 EP 479 PG 3 WC Veterinary Sciences SC Veterinary Sciences GA NC240 UT WOS:A1994NC24000007 PM 8017692 ER PT J AU JONES, RH SEGAL, DS SHARITZ, RR AF JONES, RH SEGAL, DS SHARITZ, RR TI CATION DYNAMICS IN BOTTOMLAND HARDWOOD FOREST LITTER SO AMERICAN MIDLAND NATURALIST LA English DT Article ID DECOMPOSING LEAF LITTER; GREAT DISMAL SWAMP; NUTRIENT DYNAMICS; FLOODPLAIN FOREST; DECAY-RATES; CHEMISTRY; PATTERNS; NITROGEN AB Flows of K, Ca, Mg, Fe and Mn cations through forest litter were measured for nonflooded conditions at four locations within South Carolina bottomland hardwood forests. Throughfall precipitation was sampled before and after it passed through forest litter suspended in funnels for eleven months, including the dormant season immediately after leaf fall plus the following growing season. A significant seasonal pattern in throughfall was detected in Ca only. Seasonal trends in litter leachate were found for all cations except Fe; K and Mn decreased from dormant to growing season while Ca and Mg increased. Significant differences among locations were found for all throughfall cations except Fe and for three net leachate cations-Ca, Mg and Fe. Throughfall was the predominant source of K, litter was the primary source of Mg, and throughfall and litter inputs were approximately equal for Ca, Mn and Fe. The presence of ants in three of the microcosms resulted in greatly increased leaching of K, Fe and Mn. Concentrations of all cations in leachate were more variable seasonally than concentrations in throughfall or the upper 15 cm of soil. These data suggest that when flooding is absent, litter in bottomland hardwood forests is not a net accumulator of K, Ca, Mg, Mn and Fe; however, differences in the rate at which these cations are leached may influence seasonal availability of nutrients for plant uptake. C1 KBN ENGN,GAINESVILLE,FL 32605. SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. UNIV GEORGIA,DEPT BOT,ATHENS,GA 30602. RP JONES, RH (reprint author), AUBURN UNIV,SCH FORESTRY,108 M WHITE SMITH HALL,AUBURN,AL 36849, USA. NR 22 TC 4 Z9 4 U1 0 U2 4 PU AMER MIDLAND NATURALIST PI NOTRE DAME PA UNIV NOTRE DAME, BOX 369, ROOM 295 GLSC, NOTRE DAME, IN 46556 SN 0003-0031 J9 AM MIDL NAT JI Am. Midl. Nat. PD APR PY 1994 VL 131 IS 2 BP 248 EP 256 DI 10.2307/2426250 PG 9 WC Biodiversity Conservation; Ecology SC Biodiversity & Conservation; Environmental Sciences & Ecology GA NK483 UT WOS:A1994NK48300003 ER PT J AU CHEUNG, NH YEUNG, ES AF CHEUNG, NH YEUNG, ES TI DISTRIBUTION OF SODIUM AND POTASSIUM WITHIN INDIVIDUAL HUMAN ERYTHROCYTES BY PULSED-LASER VAPORIZATION IN A SHEATH FLOW SO ANALYTICAL CHEMISTRY LA English DT Article ID CAPILLARY ELECTROPHORESIS; QUANTITATIVE-DETERMINATION; FLUORESCENCE DETECTION; LIQUID-CHROMATOGRAPHY; SINGLE NEURONS; DOPAMINE; CELLS AB Simultaneous determination of the amounts of Na and K inside single human erythrocytes was accomplished by laser vaporization and monitoring the atomic emission produced. By using a modified sheath-flow arrangement, detection of 8 fg (0.35 fmol) of Na is possible with one laser pulse. By using Poisson statistics, one can obtain single-cell information even when multiple cells are vaporized per laser pulse. The intracellular contents for a given individual were found to vary significantly. The +/-55% and +/-155% variations for Na and K, respectively, cannot be explained by changes in cell volume. There is only a weak correlation between the Na and K contents in single cells. The results reflect the age distribution of erythrocytes in the sample. Presumably, the enzymes regulating ion transport lose their activities in the older cells. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 25 TC 30 Z9 30 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD APR 1 PY 1994 VL 66 IS 7 BP 929 EP 936 DI 10.1021/ac00079a003 PG 8 WC Chemistry, Analytical SC Chemistry GA ND415 UT WOS:A1994ND41500005 PM 8160964 ER PT J AU PICKETT, DA MURRELL, MT WILLIAMS, RW AF PICKETT, DA MURRELL, MT WILLIAMS, RW TI DETERMINATION OF FEMTOGRAM QUANTITIES OF PROTOACTINIUM IN GEOLOGIC SAMPLES BY THERMAL IONIZATION MASS-SPECTROMETRY SO ANALYTICAL CHEMISTRY LA English DT Article ID U-238 TH-230 DISEQUILIBRIUM; JUAN-DE-FUCA; GORDA RIDGES; GEOCHRONOLOGY; SYSTEMATICS; PA-231; PETROGENESIS; PLUTONIUM; BASALTS; VOLCANO AB We describe a procedure for measurement of Pa-231 in geologic samples by isotope dilution thermal ionization mass spectrometry, using Pa-233 as a spike isotope, which provides marked improvements in precision and sample size relative to established decay counting techniques. This method allows determination of as little as a few tens of femtograms of Pa-231 (approximately 10(8) atoms) with a conservative estimated uncertainty of +/-1% (95% confidence level). Applications of Pa-231-U-235 systematics to uranium-series geochemistry and geochronology should be greatly enhanced by this approach. RP LOS ALAMOS NATL LAB, J514, LOS ALAMOS, NM 87545 USA. NR 32 TC 55 Z9 55 U1 0 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 EI 1520-6882 J9 ANAL CHEM JI Anal. Chem. PD APR 1 PY 1994 VL 66 IS 7 BP 1044 EP 1049 DI 10.1021/ac00079a020 PG 6 WC Chemistry, Analytical SC Chemistry GA ND415 UT WOS:A1994ND41500022 ER PT J AU JACOBSON, SC HERGENRODER, R KOUTNY, LB WARMACK, RJ RAMSEY, JM AF JACOBSON, SC HERGENRODER, R KOUTNY, LB WARMACK, RJ RAMSEY, JM TI EFFECTS OF INJECTION SCHEMES AND COLUMN GEOMETRY ON THE PERFORMANCE OF MICROCHIP ELECTROPHORESIS DEVICES SO ANALYTICAL CHEMISTRY LA English DT Article ID CAPILLARY ELECTROPHORESIS; ZONE ELECTROPHORESIS; SAMPLE INJECTION; GLASS; CHIP; TECHNOLOGY; SILICON; SYSTEMS AB A glass microchip column was fabricated for free-solution electrophoresis. The channels were wet chemically etched on a substrate using standard photolithographic techniques and were sealed using a direct bonding technique. Two methods of sample introduction are evaluated employing a cross-type channel geometry. With the preferred sample loading method, the volume of the sample plug can be accurately controlled and is time independent, enabling a constant volume to be injected. The injection can be controlled electronically and does not induce any electrophoretic mobility based bias. Separations were performed on a compact chip with a serpentine column geometry that has a 165-mm separation channel in an area of less than 10 mm x 10 mm. Band-broadening effects in a serpentine column pattern were studied. C1 OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV HLTH SCI RES,OAK RIDGE,TN 37831. NR 18 TC 664 Z9 676 U1 8 U2 83 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD APR 1 PY 1994 VL 66 IS 7 BP 1107 EP 1113 DI 10.1021/ac00079a028 PG 7 WC Chemistry, Analytical SC Chemistry GA ND415 UT WOS:A1994ND41500030 ER PT J AU JACOBSON, SC HERGENRODER, R KOUTNY, LB RAMSEY, JM AF JACOBSON, SC HERGENRODER, R KOUTNY, LB RAMSEY, JM TI HIGH-SPEED SEPARATIONS ON A MICROCHIP SO ANALYTICAL CHEMISTRY LA English DT Article ID CAPILLARY ELECTROPHORESIS; ZONE ELECTROPHORESIS; SAMPLE INJECTION; CHIP; TECHNOLOGY; SYSTEMS AB Fast, efficient separations are sought in liquid-phase analyses which incorporate a nondiscriminatory sample injection scheme and can implement a variety of detection modes. A glass microchip device for free solution electrophoresis was fabricated using standard photolithographic procedures and chemical wet etching. Separations were performed at several separation lengths from the injector to the detector with electric field strengths from 0.06 to 1.5 kV/cm. For a separation length of 0.9 mm, electrophoretic separations with baseline resolution are achieved in less than 150 ms with an electric field strength of 1.5 kV/cm and an efficiency of 1820 plates/s. For a separation length of 11.1 mm, a minimum plate height of 0.7 mum and a maximum number of plates per second of 18 600 were achieved. C1 OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. NR 19 TC 450 Z9 457 U1 4 U2 81 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD APR 1 PY 1994 VL 66 IS 7 BP 1114 EP 1118 DI 10.1021/ac00079a029 PG 5 WC Chemistry, Analytical SC Chemistry GA ND415 UT WOS:A1994ND41500031 ER PT J AU XUE, QF YEUNG, ES AF XUE, QF YEUNG, ES TI VARIABILITY OF INTRACELLULAR LACTATE-DEHYDROGENASE ISOENZYMES IN SINGLE HUMAN ERYTHROCYTES SO ANALYTICAL CHEMISTRY LA English DT Article ID CAPILLARY ZONE ELECTROPHORESIS; INDUCED FLUORESCENCE DETECTION; QUANTITATIVE-DETERMINATION; LIQUID-CHROMATOGRAPHY; NATIVE PROTEINS; SEPARATIONS; DOPAMINE; NEURONS; CELLS AB Trace amounts of enzymes within single human erythrocytes can be quantified by a combination of on-column reaction and capillary electrophoresis. A detection limit of 1.3 x 10(-21) mol of LDH was achieved with laser-induced fluorescence by monitoring the product of the enzyme-catalyzed reaction between lactate and NAD+. Single erythrocyte analysis clearly isolates the major forms of LDH. The variation of total LDH activity in a population of cells from a single individual is large, but the relative activities of the isoenzymes LDH-1 and LDH-2 are fairly constant. This can be explained by the distribution of cell age in the population. A lower enzyme activity is indicative of senescence. The efficient separation of different LDH forms and the high detection sensitivity opens up the possibility of multiple-enzyme assays with a single mammalian cell. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 41 TC 124 Z9 132 U1 2 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD APR 1 PY 1994 VL 66 IS 7 BP 1175 EP 1178 DI 10.1021/ac00079a036 PG 4 WC Chemistry, Analytical SC Chemistry GA ND415 UT WOS:A1994ND41500038 PM 8160961 ER PT J AU PERRY, SS SOMORJAI, GA AF PERRY, SS SOMORJAI, GA TI CHARACTERIZATION OF ORGANIC-SURFACES SO ANALYTICAL CHEMISTRY LA English DT Article ID SCANNING TUNNELING MICROSCOPY; ENERGY LOSS SPECTROSCOPY; RAY PHOTOELECTRON-SPECTROSCOPY; BENZENE; FILMS; MONOLAYERS; PT(111); CRYSTAL; FORCES; LEED C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,CTR ADV MAT,CATALYSIS PROGRAM,BERKELEY,CA 94720. RP PERRY, SS (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 34 TC 24 Z9 24 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD APR 1 PY 1994 VL 66 IS 7 BP A403 EP A415 DI 10.1021/ac00079a001 PG 13 WC Chemistry, Analytical SC Chemistry GA ND415 UT WOS:A1994ND41500002 ER PT J AU DIFILIPPO, FC AF DIFILIPPO, FC TI PROBABILITY-DISTRIBUTIONS FOR 1ST NEIGHBOR DISTANCES BETWEEN RESONANCES THAT BELONG TO 2 DIFFERENT FAMILIES SO ANNALS OF NUCLEAR ENERGY LA English DT Article AB For a mixture of two families of resonances, we found the probability distribution for the distance, as first neighbors, between resonances that belong to different families. Integration of this distribution gives the probability of accidental overlapping of resonances of one isotope by resonances of the other provided that the resonances of each isotope belong to a single family. RP DIFILIPPO, FC (reprint author), OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,POB 2008,BLDG 6025,OAK RIDGE,TN 37831, USA. NR 4 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 0306-4549 J9 ANN NUCL ENERGY JI Ann. Nucl. Energy PD APR PY 1994 VL 21 IS 4 BP 219 EP 221 DI 10.1016/0306-4549(94)90003-5 PG 3 WC Nuclear Science & Technology SC Nuclear Science & Technology GA ND423 UT WOS:A1994ND42300003 ER PT J AU TAN, PE BENZ, CC DOLLBAUM, C MOORE, DH EDGERTON, SM ZAVA, DT THOR, AD AF TAN, PE BENZ, CC DOLLBAUM, C MOORE, DH EDGERTON, SM ZAVA, DT THOR, AD TI PROGNOSTIC VALUE OF CATHEPSIN-D EXPRESSION IN BREAST-CANCER - IMMUNOHISTOCHEMICAL ASSESSMENT AND CORRELATION WITH RADIOMETRIC ASSAY SO ANNALS OF ONCOLOGY LA English DT Article DE BREAST CANCER; CATHEPSIN-D; IMMUNOASSAY; IMMUNOHISTOCHEMISTRY; PROGNOSTIC MARKER ID ESTROGEN-REGULATED PROTEIN; EXTRACELLULAR-MATRIX; CELLS; OVEREXPRESSION; DISEASES; SURVIVAL; GROWTH; CARCINOMAS; ONCOGENE; MAMMARY AB Background: The prognostic significance of Cathepsin D and optimal methodologies to measure Cathepsin D in breast cancers are controversial. Patients and methods. Quantitative (immunoradiometric) and semiquantitative (immunohistochemical) assays for Cathepsin D expression were compared using 25 breast carcinomas. Immunohistochemical Cathepsin D results were derived using 3 different anti-Cathepsin D antibodies and significant associations between immunohistochemical and radiometric Cathepsin D data were observed for each reagent. Immunohistochemical analysis of Cathepsin D expression was performed on nearly 500 fixed-embedded archival breast cancers with long-term patient follow-up using 2 anti-Cathepsin D antibodies (CDR2-11/23, IC11). Results: The immunohistochemical reagents recognized generally overlapping subsets of Cathepsin D positive tumors (correlation co-efficient 0.54; p = 0.00016). Correlations between Cathepsin D data and clinical, histologic or biologic features differed for each antibody. For the node-negative patient subset, Cathepsin D immunopositivity correlated with erbB-2 and stress-response protein 27 overexpression but not survival. Cathepsin D positivity was associated with subsequent distant metastasis and estrogen receptor positivity in node positive patients. Univariate analysis of all patients suggested that Cathepsin D in-immunopositivity may be predictive of a reduced metastasis-free but not overall survival. Multivariate analysis, however, failed to confirm an independent prognostic value for Cathepsin D in breast cancer patients. Conclusions: These data do not confirm an independent prognostic significance for Cathepsin D using immunohistochemical methods on breast cancers. C1 UNIV VERMONT,DEPT PATHOL,MED ALUMNI BLDG,BURLINGTON,VT 05405. MASSACHUSETTS GEN HOSP,DEPT PATHOL,BOSTON,MA 02114. HARVARD UNIV,SCH MED,DEPT PATHOL,BOSTON,MA 02115. UNIV CALIF SAN FRANCISCO,CANC RES INST,DEPT MED,SAN FRANCISCO,CA 94143. AERON BIOTECHNOL INC,SAN LEANDRO,CA. LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. NR 40 TC 21 Z9 21 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0923-7534 J9 ANN ONCOL JI Ann. Oncol. PD APR PY 1994 VL 5 IS 4 BP 329 EP 336 PG 8 WC Oncology SC Oncology GA NP846 UT WOS:A1994NP84600007 ER PT J AU BERGER, MJ SALTZMAN, JS AF BERGER, MJ SALTZMAN, JS TI AMR ON THE CM-2 SO APPLIED NUMERICAL MATHEMATICS LA English DT Article; Proceedings Paper CT 3rd ARO Workshop on Adaptive Methods for Partial Differential Equations CY MAY 18-20, 1992 CL RENSSELAER POLYTECH INST, TROY, NY SP USA RES OFF HO RENSSELAER POLYTECH INST AB We describe the development of a structured adaptive mesh algorithm (AMR) for the CM-2. We develop a data layout scheme that preserves locality even for communication between fine and coarse grids. On 8K of a 32K machine we achieve performance slightly less than one CPU of the Cray Y-MP. We apply our algorithm to an inviscid compressible flow problem. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP BERGER, MJ (reprint author), NYU,COURANT INST MATH SCI,251 MERCER ST,NEW YORK,NY 10012, USA. NR 26 TC 23 Z9 25 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9274 J9 APPL NUMER MATH JI Appl. Numer. Math. PD APR PY 1994 VL 14 IS 1-3 BP 239 EP 253 DI 10.1016/0168-9274(94)90028-0 PG 15 WC Mathematics, Applied SC Mathematics GA NH534 UT WOS:A1994NH53400014 ER PT J AU ALLISON, SW GILLIES, GT AF ALLISON, SW GILLIES, GT TI OBSERVATIONS OF AND APPLICATIONS FOR SELF-IMAGING IN OPTICAL FIBERS SO APPLIED OPTICS LA English DT Note DE OPTICAL FIBERS; SELF-IMAGING; IMAGE ANALYSIS ID LASER AB Experimental results of self-imaging in optical fibers are reported along with an analytical model that explains the observations. Some implications for sensor design are discussed. C1 UNIV VIRGINIA, DEPT MECH AEROSP & NUCL ENGN, CHARLOTTESVILLE, VA 22901 USA. RP ALLISON, SW (reprint author), OAK RIDGE NATL LAB, DIV ENGN TECHNOL, OAK RIDGE, TN 37831 USA. OI Allison, Stephen/0000-0002-5887-5403 NR 13 TC 11 Z9 11 U1 0 U2 4 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD APR 1 PY 1994 VL 33 IS 10 BP 1802 EP 1805 PG 4 WC Optics SC Optics GA ND424 UT WOS:A1994ND42400003 PM 20885510 ER PT J AU SWANTHNER, W CHOW, WW AF SWANTHNER, W CHOW, WW TI GRAM-SCHMIDT ORTHONORMALIZATION OF ZERNIKE POLYNOMIALS FOR GENERAL APERTURE SHAPES SO APPLIED OPTICS LA English DT Article AB We present analytical derivations of aberration functions for annular sector apertures. We show that the Zernike functions for circular apertures can be generalized for any aperture shape. Interferogram reduction when Zernike functions were used as a basis set was performed on annular sectors. We have created a computer program to generate orthogonal aberration functions. Completely general aperture shapes and user-selected basis sets may be treated with a digital Gram-Schmidt orthonormalization approach. C1 SANDIA NATL LABS, DEPT 2235, ALBUQUERQUE, NM 87185 USA. RP SWANTHNER, W (reprint author), BSC OPT, 433 LIVE OAK LOOP NE, ALBUQUERQUE, NM 87122 USA. NR 11 TC 34 Z9 38 U1 0 U2 7 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD APR 1 PY 1994 VL 33 IS 10 BP 1832 EP 1837 PG 6 WC Optics SC Optics GA ND424 UT WOS:A1994ND42400008 PM 20885515 ER PT J AU KOIKE, M NAMIOKA, T AF KOIKE, M NAMIOKA, T TI MERIT FUNCTION FOR THE DESIGN OF GRATING INSTRUMENTS SO APPLIED OPTICS LA English DT Article DE MONOCHROMATOR DESIGN METHOD; MERIT FUNCTION; HOLOGRAPHIC GRATING; RULED GRATING WITH VARIABLE SPACING ID SPECTROGRAPH; SYSTEMS AB A merit function that is closely correlated with the rms spread of an infinite number of ray-traced spots by means of analytic spot-diagram formulas is critically evaluated in comparison with exact ray The analytic spot-diagram formulas are found to generate spot diagrams that are almost indistinguishable from ray-traced ones. The rms spread of ray-traced spots about the mean shows varying degrees of statistical dispersion depending on the number of rays traced, and it approaches the value given by the merit function as the number of rays is increased. All the results clearly show that the merit function behaves as defined and provides enough accuracy and a sufficiently short computing time for the design of highly sophisticated grating instruments. RP KOIKE, M (reprint author), LAWRENCE BERKELEY LAB, CTR X-RAY OPT, 1 CYCLOTRON RD, MS 2-400, BERKELEY, CA 94720 USA. NR 17 TC 21 Z9 27 U1 0 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD APR 1 PY 1994 VL 33 IS 10 BP 2048 EP 2056 PG 9 WC Optics SC Optics GA ND424 UT WOS:A1994ND42400036 PM 20885543 ER PT J AU XUE, YJ YEUNG, ES AF XUE, YJ YEUNG, ES TI LASER-BASED ULTRAVIOLET-ABSORPTION DETECTION IN CAPILLARY ELECTROPHORESIS SO APPLIED SPECTROSCOPY LA English DT Article DE LASERS; ABSORPTION; CAPILLARY ELECTROPHORESIS ID INDUCED FLUORESCENCE DETECTION; ZONE ELECTROPHORESIS; AMINO-ACIDS; NATIVE PROTEINS AB Laser-based UV absorption in capillary electrophoresis is demonstrated. The use of vacuum photodiodes and an all-electronic noise canceller provides adequate baseline stability despite the large inherent intensity noise in UV lasers. A 4-fold improvement in the detection limit is achieved in comparison to that of commercial instruments. The main advantage here is the better optical coupling with small capillary tubes, maximizing the available optical pathlength for absorption. C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 25 TC 6 Z9 6 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 APR PY 1994 VL 48 IS 4 BP 502 EP 506 DI 10.1366/000370294775268983 PG 5 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA NK687 UT WOS:A1994NK68700013 ER PT J AU FERRARO, JR KINI, AM WILLIAMS, JM STOUT, P AF FERRARO, JR KINI, AM WILLIAMS, JM STOUT, P TI VIBRATIONAL STUDIES OF C-13-LABELED AND S-34-LABELED BIS(ETHYLENEDITHIO)TETRATHIAFULVALENE (ET) DONOR MOLECULE SO APPLIED SPECTROSCOPY LA English DT Article DE FT-IR; FT-RAMAN; C-13-LABELED AND S-34-LABELED BIS(ETHYLENEDITHIO)TETRATHIAFULVALENE (BEDT-TTF OR ET) ID SUPERCONDUCTING PAIRING MECHANISM; BEDT-TTF AB FT-IR and FT-Raman studies of C-13- and S-34-labeled bis(ethylanedithio)tetrathiafulvalene (BEDT-TTF or ET) electron-donor molecules were made, and the results are presented. Assignments for fundamental vibrations in ET were verified. Spectral data suggest that ET has no center of symmetry (confirming X-ray data) and that the data can be reconciled by a D-type point group with only slight interactions occurring between the four molecules per unit cell. C1 BIORAD,DIV DIGILAB,CAMBRIDGE,MA 02139. RP FERRARO, JR (reprint author), ARGONNE NATL LAB,DIV CHEM & MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Kini, Aravinda/F-4467-2012 NR 13 TC 2 Z9 2 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 APR PY 1994 VL 48 IS 4 BP 531 EP 534 DI 10.1366/000370294775268938 PG 4 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA NK687 UT WOS:A1994NK68700017 ER PT J AU BYRNE, CD SCHWARTZ, K MEER, K CHENG, JF LAWN, RM AF BYRNE, CD SCHWARTZ, K MEER, K CHENG, JF LAWN, RM TI THE HUMAN APOLIPOPROTEIN(A) PLASMINOGEN GENE-CLUSTER CONTAINS A NOVEL HOMOLOG TRANSCRIBED IN LIVER SO ARTERIOSCLEROSIS AND THROMBOSIS LA English DT Article DE LIPOPROTEIN(A); APOLIPOPROTEIN(A); APOLIPOPROTEIN GENES; PLASMINOGEN-RELATED GENES ID HEPATOCYTE GROWTH-FACTOR; FIELD GEL-ELECTROPHORESIS; HUMAN-CHROMOSOME; MOLECULAR-CLONING; SCATTER FACTOR; GLOBIN GENE; DNA; LIPOPROTEIN(A); EXPRESSION; LINKAGE AB Lipoprotein(a) is an atherogenic lipoprotein whose function and plasma concentration reflect the structure and regulation of the apolipoprotein(a) gene. Apolipoprotein(a) is a close homologue of plasminogen, and their genes are tightly linked on chromosome 6. To further characterize these genes, we analyzed overlapping human genomic yeast artificial chromosome clones, which revealed a cluster of four highly homologous genes encoding apolipoprotein(a), plasminogen, and two apolipoprotein(a)-related genes (rg) or pseudogenes. Hybridization analysis and reverse transcriptase polymerase chain reaction showed that one of these novel genes, designated apolipoprotein(a)rg-C, has a domain structure similar to apolipoprotein(a) and is transcribed in human liver. Three additional homologues designated as plasminogen-related genes are shown to be unlinked to this gene cluster and reside on chromosomes 2 and 4. C1 STANFORD UNIV,MED CTR,SCH MED,FALK CARDIOVASC RES CTR,STANFORD,CA 94305. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. FU NHLBI NIH HHS [HL 48638-01] NR 31 TC 34 Z9 35 U1 0 U2 1 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 1049-8834 J9 ARTERIOSCLER THROMB JI Arterioscler. Thromb. PD APR PY 1994 VL 14 IS 4 BP 534 EP 541 PG 8 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA NE051 UT WOS:A1994NE05100005 PM 8148351 ER PT J AU REAVEN, PD GRASSE, BJ TRIBBLE, DL AF REAVEN, PD GRASSE, BJ TRIBBLE, DL TI EFFECTS OF LINOLEATE-ENRICHED AND OLEATE-ENRICHED DIETS IN COMBINATION WITH ALPHA-TOCOPHEROL ON THE SUSCEPTIBILITY OF LDL AND LDL SUBFRACTIONS TO OXIDATIVE MODIFICATION IN HUMANS SO ARTERIOSCLEROSIS AND THROMBOSIS LA English DT Article DE ATHEROSCLEROSIS; CONJUGATED DIENES; LIPID OXIDATION; DENSE LDL; LDL SUBCLASSES; VITAMIN-E; FATTY ACIDS ID LOW-DENSITY-LIPOPROTEIN; CORONARY-ARTERY DISEASE; CHOLESTEROL-FED RABBITS; VITAMIN-E; INVITRO OXIDATION; BETA-CAROTENE; ATHEROSCLEROTIC LESIONS; ENHANCED SUSCEPTIBILITY; LIQUID-CHROMATOGRAPHY; MYOCARDIAL-INFARCTION AB This report describes the effects of feeding linoleate- or oleate-enriched diets to subjects who were concurrently taking 1200 mg/d of alpha-tocopherol on the susceptibility of low-density lipoprotein (LDL) and buoyant and dense LDL subfractions to oxidation. LDL isolated from subjects who consumed linoleate-enriched diets was more susceptible to copper-mediated oxidation, as measured by formation of conjugated dienes and lipid peroxides and loss of unsaturated fatty acids, compared with LDL isolated from subjects who consumed their usual or oleate-enriched diets. In all subjects, buoyant LDL had a higher content of alpha-tocopherol per particle and a lower 18:2 to 18:1 ratio and was considerably more resistant to oxidation than dense LDL. Although dense LDL from all groups had comparable alpha-tocopherol levels, dense LDL from the linoleate group was most susceptible to oxidation, followed by that from the standard diet, whereas dense LDL isolated from the oleate diet group was most resistant. In summary, high dosages of alpha-tocopherol did not prevent enhanced susceptibility to oxidation of LDL isolated from subjects fed linoleate-enriched diets. Furthermore, dense LDL was more susceptible to oxidation than was buoyant LDL, and this effect was greatly exaggerated in the dense LDL isolated from subjects fed linoleate-enriched diets. Conversely, dense LDL isolated from subjects fed oleate-enriched diets was the most protected. If oxidation of LDL is important in the pathogenesis of atherosclerosis, then these data suggest that in people with increased amounts of small, dense LDL, dietary enrichment in oleic acid may decrease the susceptibility of their LDL to oxidation. C1 UNIV CALIF SAN DIEGO,GEN CLIN RES CTR,NUTR UNIT,LA JOLLA,CA 92093. LAWRENCE BERKELEY LAB,DIV LIFE SCI,DEPT MOLEC & NUCL MED,BERKELEY,CA 94720. RP REAVEN, PD (reprint author), UNIV CALIF SAN DIEGO,DEPT MED,DIV ENDOCRINOL & METAB,9500 GILMAN DR,BSB 1080,LA JOLLA,CA 92093, USA. FU NCRR NIH HHS [MO1 RR00827]; NHLBI NIH HHS [HL-14197] NR 51 TC 148 Z9 149 U1 0 U2 2 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 1049-8834 J9 ARTERIOSCLER THROMB JI Arterioscler. Thromb. PD APR PY 1994 VL 14 IS 4 BP 557 EP 566 PG 10 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA NE051 UT WOS:A1994NE05100008 PM 8148354 ER PT J AU COLANGELI, L MENNELLA, V STEPHENS, JR BUSSOLETTI, E AF COLANGELI, L MENNELLA, V STEPHENS, JR BUSSOLETTI, E TI LABORATORY SIMULATION OF MICRODIAMONDS PRESENT IN-SPACE SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE INTERPLANETARY MEDIUM; STARS, CARBON; INTERSTELLAR MEDIUM, DUST, EXTINCTION ID AMORPHOUS-CARBON FILMS; INTERSTELLAR DIAMONDS; ORGANIC MATERIAL; METEORITES; CHONDRITE; EMISSION; ORIGIN; BANDS AB Among various carbonaceous grains which are expected to be present in space, submicron diamond particles have received particular attention recently. Laboratory analyses on fine-grained diamond residues extracted from primitive meteorites suggest that this component is one of the most abundant forms of circumstellar dust preserved in meteoritic samples. In addition, recent infrared spectroscopic observations seem to show a typical signature of diamonds in dense interstellar molecular clouds. Measurements on analogue grains synthesized in the laboratory may provide experimental results useful to interpret both astronomical observations and laboratory data on meteoritic diamond residues. Following this line of attack to the problem of interstellar diamond characterization, in the present paper we report the results of systematic analyses performed on three soot samples which have been produced in the laboratory by means of detonation processes. As the explosion products contain a significant fraction of submicron diamond-like grains, we have analyzed the properties of the residues extracted from the soots by means of nitric and perchloric acid treatments. A variety of morphological, Raman and infrared laboratory analyses were performed. The results have been compared with data available in the literature for meteoritic samples to get new hints about the properties expected for diamond grains in the interstellar medium. C1 LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. UNIV NAPOLI, IST NAVALE, IST FIS SPERIMENTALE, I-80133 NAPLES, ITALY. RP COLANGELI, L (reprint author), OSSERV ASTRON CAPODIMONTE, VIA MOIARIELLO 16, I-80131 NAPLES, ITALY. NR 37 TC 11 Z9 11 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD APR PY 1994 VL 284 IS 2 BP 583 EP 592 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NG666 UT WOS:A1994NG66600024 ER PT J AU BERSANELLI, M BENSADOUN, M DEAMICI, G LEVIN, S LIMON, M SMOOT, GF VINJE, W AF BERSANELLI, M BENSADOUN, M DEAMICI, G LEVIN, S LIMON, M SMOOT, GF VINJE, W TI ABSOLUTE MEASUREMENT OF THE COSMIC MICROWAVE BACKGROUND AT 2 GHZ SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC MICROWAVE BACKGROUND; RADIO CONTINUUM, GENERAL ID 12 CENTIMETER WAVELENGTH; RADIATION TEMPERATURE; PRECISE MEASUREMENT; 1.32 MILLIMETERS; 7.5 GHZ; SPECTRUM; UNIVERSE; CN; FREQUENCY; DISTORTIONS AB We measured the intensity of the cosmic microwave background (CMB), radiation at a frequency of 2.0 GHz (15 cm wavelength) with a ground-based total-power radio-frequency (RF) gain radiometer calibrated at the antenna aperture with a quasi-free space cold load. The observations were performed from a remote, high-altitude site near the Amundsen-Scott South Pole Station to minimize systematic effects. The measured thermodynamic temperature of the CMB is T(CMB) = 2.55 +/- 0.14 K (68% confidence level), the limiting factors in the accuracy being the subtraction of the atmospheric and Galactic contributions. The atmospheric emission was evaluated both by direct measurements and by extrapolation from our higher frequency data. The Galactic emission was determined by scaling low-frequency maps and was checked with differential drift scans. Our result is approximately 1 sigma lower than the recent accurate value of T(CMB) obtained by COBE-FIRAS above 60 GHz. The temperature of the sky (i.e., CMB plus Galaxy and extragalactic sources) at the south celestial pole with approximately 22-degrees resolution is T(A,Sky) = 2.83 +/- 0.10 K, and its accuracy is limited by the subtraction of atmospheric emission. C1 JET PROP LAB, PASADENA, CA 91109 USA. UNIV CALIF BERKELEY, SPACE SCI LAB, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RP BERSANELLI, M (reprint author), CNR, IST FIS COSM, VIA BASSINI 15, I-20133 MILAN, ITALY. NR 45 TC 33 Z9 33 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD APR 1 PY 1994 VL 424 IS 2 BP 517 EP 529 DI 10.1086/173910 PN 1 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NC793 UT WOS:A1994NC79300001 ER PT J AU DAVIES, MB BENZ, W HILLS, JG AF DAVIES, MB BENZ, W HILLS, JG TI CLOSE ENCOUNTERS OF THE 3RD-BODY KIND SO ASTROPHYSICAL JOURNAL LA English DT Article DE BINARIES, CLOSE; CELESTIAL MECHANICS, STELLAR DYNAMICS; HYDRODYNAMICS; METHODS, NUMERICAL ID SINGLE STAR SCATTERING; GLOBULAR-CLUSTERS; CROSS-SECTIONS; STELLAR DYNAMICS; NEUTRON-STARS; BINARY STARS; EQUAL MASSES; EVOLUTION; COLLISIONS AB We simulated encounters involving binaries of two eccentricities: e = 0 (i.e., circular binaries) and e = 0.5. In both cases the binary contained a point mass of 1.4 M. (i.e., a neutron star) and an 0.8 M. main-sequence star modeled as a polytrope. The semimajor axes of both binaries were set to 60 R. (0.28 AU). We considered intruders of three masses: 1.4 M. (a neutron star), 0.8 M. (a main-sequence star or a higher mass white dwarf), and 0.64 M. (a more typical mass white dwarf). Our strategy was to perform a large number (40,000) of encounters using a three-body code, then to rerun a small number of cases with a three-dimensional smoothed particle hydrodynamics (SPH) code to determine the importance of hydrodynamical effects. Using the results of the three-body runs, we computed the exchange cross sections, sigma(ex). From the results of the SPH runs, we computed the cross sections for clean exchange, denoted by sigma(cx); the formation of a triple system, denoted by sigma(trp); and the formation of a merged binary with an object formed from the merger of two of the stars left in orbit around the third star, denoted by sigma(mb). For encounters between either binary and a 1.4 M. neutron star, sigma(cx) approximately 0.7sigma(ex) and sigma(mb) + sigma(trp) approximately 0.3sigma(ex). For encounters between either binary and the 0.8 M. main-sequence star, sigma(cx) approximately 0.50ex and sigma(mb) + sigma(trp) approximately 1.0sigma(ex). If the main sequence star is replaced by a white dwarf intruder of the same mass, we have sigma(cx) approximately 0.6sigma(ex) and sigma(mb) + sigma(trp) approximately 0.8sigma(ex). For encounters between either binary and the 0.64 M. white dwarf, sigma(cx) approximately 0.6sigma(ex) and sigma(mb) + sigma(trp) approximately 1.3sigma(ex). If the white dwarf is replaced by a main-sequence star of the same mass, we have sigma(cx) approximately 0.5sigma(ex) and sigma(mb) + sigma(trp) approximately 1.6sigma(ex). Although the exchange cross section is a sensitive function of intruder mass, we see that the cross section to produce merged binaries is roughly independent of intruder mass. The merged binaries produced have semi-major axes much larger than either those of the original binaries or those of binaries produced in clean exchanges. Coupled with their lower kick velocities, received from the encounters, their larger size will enhance their cross section, shortening the waiting time to a subseqent encounter with another single star. C1 UNIV ARIZONA,STEWARD OBSERV,TUCSON,AZ 85721. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP DAVIES, MB (reprint author), CALTECH,130-33,PASADENA,CA 91125, USA. NR 19 TC 40 Z9 40 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 APR 1 PY 1994 VL 424 IS 2 BP 870 EP 886 DI 10.1086/173937 PN 1 PG 17 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NC793 UT WOS:A1994NC79300028 ER PT J AU DEAMICI, G TORRES, S BENSADOUN, M BERSANELLI, M DALLOGLIO, G LIMON, M SMOOT, G SIRONI, G VILLELA, T WITEBSKY, C AF DEAMICI, G TORRES, S BENSADOUN, M BERSANELLI, M DALLOGLIO, G LIMON, M SMOOT, G SIRONI, G VILLELA, T WITEBSKY, C TI A RESEARCH-PROGRAM TO MAP THE GALACTIC EMISSION AT LOW-FREQUENCIES SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT 2nd United-Nations/European-Space-Agency Workshop for Developing Countries: Basic Space Science CY NOV 09-13, 1992 CL BOGOTA, COLUMBIA SP UN, EUROPEAN SPACE AGCY ID BACKGROUND-RADIATION; TEMPERATURE; COBE; MHZ AB The need for accurate and complete maps of the galaxy at radio frequencies is made evident not only by the importance of the data in the study of galactic dynamics and structure formation but also in the analysis of cosmic background radiation data. A summary of the existing radio surveys of our galaxy is presented along with their limitations. A new program, the Galactic Emission Mapping (GEM) project, to obtain calibrated and complete maps of the galaxy in the 400 to 1400 MHz range, is outlined. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV LOS ANDES,BOGOTA,COLOMBIA. CTR INT FIS,BOGOTA,COLOMBIA. CNR,IFCTR,I-20133 MILAN,ITALY. UNIV ROME,I-00100 ROME,ITALY. UNIV MILAN,I-20122 MILAN,ITALY. CNPQ,INPE,RIO JANEIRO,BRAZIL. RP DEAMICI, G (reprint author), UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720, USA. OI Limon, Michele/0000-0002-5900-2698 NR 21 TC 5 Z9 5 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD APR PY 1994 VL 214 IS 1-2 BP 151 EP 160 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NV329 UT WOS:A1994NV32900013 ER PT J AU GOLDSTEIN, AH ROGERS, RD AF GOLDSTEIN, AH ROGERS, RD TI SUBSIDIZED MINING BY MICROBE - REPLY SO BIO-TECHNOLOGY LA English DT Letter C1 IDAHO NATL ENGN LAB,IDAHO FALLS,ID. RP GOLDSTEIN, AH (reprint author), CALIF STATE UNIV LOS ANGELES,DEPT BIOL,LOS ANGELES,CA 90032, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU NATURE PUBLISHING CO PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 SN 0733-222X J9 BIO-TECHNOL JI Bio-Technology PD APR PY 1994 VL 12 IS 4 BP 328 EP 328 DI 10.1038/nbt0494-328b PG 1 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA ND195 UT WOS:A1994ND19500003 ER PT J AU SIEGEL, MM HUANG, JF LIN, BW TSAO, RS EDMONDS, CG AF SIEGEL, MM HUANG, JF LIN, BW TSAO, RS EDMONDS, CG TI STRUCTURES OF BACITRACIN-A AND ISOLATED CONGENERS - SEQUENCING OF CYCLIC-PEPTIDES WITH BLOCKED LINEAR SIDE-CHAINS BY ELECTROSPRAY-IONIZATION MASS-SPECTROMETRY SO BIOLOGICAL MASS SPECTROMETRY LA English DT Article ID MULTIPLY CHARGED IONS; COMPONENTS; CHROMATOGRAPHY; DISSOCIATION; INFORMATION; SEPARATION; PROTEINS; SPECTRA AB The bacitracin antibiotic complex consists principally of bacitracin A, a peptide antibiotic containing seven amino acid residues in a ring and five amino acid residues in a blacked side chain, together with a mixture of minor components presumably related but of unknown structures. A preparative high-performance liquid chromatographic method was developed for isolating the minor components A(2), B-1 and B-2 which were then characterized by amino acid analysis, exact mass fast atom bombardment (FAB) mass spectrometry, FAB tandem mass spectrometry (MS/MS) and electrospray ionization (ESI) mass spectrometry. For bacitracins A (MW 1421), A(2) (MW 1421), B-1a (MW 1407), B-1b (MW 1407), B-2 (MW 1407) and F (MW 1419), the side chain sequences were determined by ESI MS/MS and ESI nozzle-skimmer collision-induced dissociation (CID) mass spectrometry and the ring sequences elucidated by ESI nozzle-skimmer CID MS/MS. Relative to bacitracin A, bacitracin A(2a) has the modified isoelucine residue at position 1 replaced by a modified allo-isoleucine residue, bacitracin B-1a has the isoelucine residue at position 8 replaced by a valine residue, bacitracin B-1b has the isoleucine residue at position 5 replaced by a valine residue and bacitracin B-2 has the modified isoleucine residue at position 1 replaced by a modified valine residue. FAB tandem mass spectra were shown to be consistent with the above structural assignments for the isolated bacitracin components. Structures were also proposed for the trace bacitracin components C-1 (MW 1393) and D, (MW 1379) using ESI MS/MS data obtained from the analysis of the bacitracin complex without isolation. C1 PACIFIC NORTHWEST LAB,DEPT CHEM SCI,RICHLAND,WA 99352. RP SIEGEL, MM (reprint author), AMER CYANAMID CO,DIV MED RES,LEDERLE LABS,NEW YORK,NY 10965, USA. FU NIGMS NIH HHS [GM 47423] NR 38 TC 29 Z9 30 U1 1 U2 7 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 1052-9306 J9 BIOL MASS SPECTROM JI Biol. Mass Spectrom. PD APR PY 1994 VL 23 IS 4 BP 186 EP 204 DI 10.1002/bms.1200230403 PG 19 WC Biophysics; Spectroscopy SC Biophysics; Spectroscopy GA NE824 UT WOS:A1994NE82400002 PM 8172927 ER PT J AU KENNEDY, TF AF KENNEDY, TF TI THE ECOLOGY OF BEMBIDION-OBTUSUM (SER) (COLEOPTERA, CARABIDAE) IN WINTER-WHEAT FIELDS IN IRELAND SO BIOLOGY AND ENVIRONMENT-PROCEEDINGS OF THE ROYAL IRISH ACADEMY LA English DT Article; Proceedings Paper CT Meeting of the Royal-Irish-Academy CY MAR 16, 1994 CL DUBLIN, IRELAND SP ROYAL IRISH ACAD ID YELLOW DWARF VIRUS; SPRING BARLEY; CEREAL APHIDS; POLYPHAGOUS PREDATORS; SUGAR-BEET; ARTHROPODS; DIPTERA; ANTHOMYIIDAE; POPULATIONS; COL AB Bembidion obtusum (Ser.) has been found to be one of the most numerous carabid beetles occurring in winter wheat in Ireland. The species showed both nocturnal and diurnal activity and was found in fields from autumn until early summer, but showed peak activity over winter when it dominated the carabid fauna. The field distribution of B. obtusum was aggregated with a mean density of 23/m2, and beetles were only found in the soil surface layer. The width of the proximal protarsal segment was used to determine the sex of live beetles, males being larger than females. Egg-laying by B. obtusum was recorded in the laboratory during March and April. The opaque eggs were cylindrical in shape and measured 0.57mm X 0.34mm. The lifespan of beetles is considered to be one year. An-examination of crop contents of B. obtusum showed that significantly more contained aphid remains than remains of Collembola or mites, but the diet varied with season. RP KENNEDY, TF (reprint author), TEAGASC,OAK PK RES CTR,CARLOW,IRELAND. NR 56 TC 6 Z9 6 U1 2 U2 5 PU ROYAL IRISH ACADEMY PI DUBLIN PA 19 DAWSON STREET, DUBLIN 2, IRELAND SN 0791-7945 J9 BIOL ENVIRON JI Biol. Environ.-Proc. R. Irish Acad. PD APR PY 1994 VL 94B IS 1 BP 33 EP 40 PG 8 WC Biology; Environmental Sciences SC Life Sciences & Biomedicine - Other Topics; Environmental Sciences & Ecology GA NP745 UT WOS:A1994NP74500002 ER PT J AU OKAMOTO, Y AF OKAMOTO, Y TI DEPENDENCE ON THE DIELECTRIC MODEL AND PH IN A SYNTHETIC HELICAL PEPTIDE STUDIED BY MONTE-CARLO SIMULATED ANNEALING SO BIOPOLYMERS LA English DT Article ID MOLECULAR-DYNAMICS SIMULATIONS; OCCURRING AMINO-ACIDS; ISOLATED C-PEPTIDE; HYDROGEN-BOND INTERACTIONS; SIDE-CHAIN INTERACTIONS; ALPHA-HELIX; RIBONUCLEASE-A; CRYSTALLOGRAPHIC REFINEMENT; NONBONDED INTERACTIONS; ENERGY PARAMETERS AB Monte Carlo simulated annealing is applied to the tertiary structure prediction of a 17-residue synthetic peptide, which is known by experiment to exhibit high helical content at low pH. Two dielectric models are considered: sigmoidal distance-dependent dielectric function and a constant dielectric function (epsilon = 2). Starting from completely random initial conformations, our simulations for both dielectric models at low pH gave many helical conformations. The obtained low-energy conformations are compared with the nuclear Overhauser effect spectroscopy cross-peak data for both main chain and side chains, and it is shown that the results for the sigmoidal dielectric function are in remarkable agreement with the experimental data. The results predict the existence of two disjoint helices around residues 5-9 and 11-16, while nmr experiments imply significant alpha-helix content between residues 5 and 14. Simulations with high pH, on the other hand, hardly gave a helical conformation, which is also in accord with the experiment. These findings indicate that when side chains are charged, electrostatic interactions due to these charges play a major role in the helix stability. Our results are compared with the previous 500 ps molecular dynamics simulations of the same peptide. It is argued that simulated annealing is superior to molecular dynamics in two respects: (1) direct folding of alpha-helix from completely random initial conformations is possible for the former, whereas only unfolding of an alpha-helix can be studied by the latter; (2) while both methods predict high helix content for low pH, the results for high pH agree with experiment (low helix content) only for the former method. (C) 1994 John Wiley & Sons, Inc. RP OKAMOTO, Y (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 51 TC 37 Z9 37 U1 1 U2 2 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0006-3525 J9 BIOPOLYMERS JI Biopolymers PD APR PY 1994 VL 34 IS 4 BP 529 EP 539 DI 10.1002/bip.360340408 PG 11 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA NE563 UT WOS:A1994NE56300007 PM 8186363 ER PT J AU WOODWARD, J BROWN, JP EVANS, BR AFFHOLTER, KA AF WOODWARD, J BROWN, JP EVANS, BR AFFHOLTER, KA TI PAPAIN DIGESTION OF CRUDE TRICHODERMA-REESEI CELLULASE - PURIFICATION AND PROPERTIES OF CELLOBIOHYDROLASE-I AND CELLOBIOHYDROLASE-II CORE PROTEINS SO BIOTECHNOLOGY AND APPLIED BIOCHEMISTRY LA English DT Article ID X-RAY-SCATTERING; 2 CELLOBIOHYDROLASES; ENZYMATIC-HYDROLYSIS; LIMITED PROTEOLYSIS; BACTERIAL CELLULASE; FUNGAL CELLULASES; MOLECULAR-CLONING; ENDO-TYPE; EXO-TYPE; DOMAIN AB The major cellulase components produced by Trichoderma reesei are composed of distinct catalytic and cellulose-binding domains. A simple two-step procedure is described for the purification of the catalytic domains, also termed core proteins (cp), of the major components, cellobiohydrolase (CBH) I and II. The. novel aspect of this procedure is that native CBH I and II do not have to be purified initially. Papain digestion of a commercial T. reesei cellulase preparation followed by gel filtration on a Superdex 75 column resulted in the separation of fractions containing CBH I cp and CBH II cp; chromatofocusing purified the latter to homogeneity. N-terminal protein sequencing of CBH II cp provided good evidence for its identity. A comparison of the catalytic activity and cellulose-binding ability of these cp was made. A major difference between them was that CBH II cp bound to microcrystalline cellulose, unlike CBH I cp. CBH I cp readily hydrolysed the bond between the aglycone and cellobiose in p-nitrophenyl cellobioside unlike the CBH II cp preparation. Neither CBH I cp nor CBH II cp had activity toward carboxymethylcellulose, but both were able to hydrolyse barley beta-glucan. It was also shown that incubation of cellulose fibres with native CBH I, CBH I cp or CBH II cp resulted in a smoothing of the fibre surface. RP WOODWARD, J (reprint author), OAK RIDGE NATL LAB,DIV CHEM TECHNOL,POB 2008,OAK RIDGE,TN 37831, USA. NR 31 TC 11 Z9 11 U1 1 U2 3 PU PORTLAND PRESS PI LONDON PA 59 PORTLAND PLACE, LONDON, ENGLAND W1N 3AJ SN 0885-4513 J9 BIOTECHNOL APPL BIOC JI Biotechnol. Appl. Biochem. PD APR PY 1994 VL 19 BP 141 EP 153 PN 2 PG 13 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA NF276 UT WOS:A1994NF27600001 PM 8192865 ER PT J AU NADEAU, R ANTOLIK, M JOHNSON, PA FOXALL, W MCEVILLY, TV AF NADEAU, R ANTOLIK, M JOHNSON, PA FOXALL, W MCEVILLY, TV TI SEISMOLOGICAL STUDIES AT PARKFIELD .3. MICROEARTHQUAKE CLUSTERS IN THE STUDY OF FAULT-ZONE DYNAMICS SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Article ID P-WAVE VELOCITY; EARTHQUAKE PREDICTION; CALIFORNIA; COMPRESSION; LOCATIONS; BEHAVIOR; MODELS; SEARCH; SLIP AB More than half of the microearthquakes that occur near Parkfield, California, when located with high-resolution methods, are seen to define some 80 small clusters of 2 to 12 similar events. Each cluster occupies a patch typically 100 to 200 m in length within the fault zone. Cluster members have nearly identical waveforms (correlation coefficient of 0.9 or greater) to frequencies of 50 to 100 Hz, as recorded by the borehole-installed seismographic network. The clusters are distributed throughout the fault zone around the presumed nucleation region, in the locked section to the SE and in the creeping part of the NW of the previous M 6 hypocenter. They are also found in the Salinian block several kilometers SW of the fault zone. The total area occupied by all of the clusters constitutes only a small fraction (1 to 2%) of the fault zone approaching failure at Parkfield. Such clusters provide insight into the dynamics of the failure process through their spatial-temporal characteristics and their mechanisms. They also serve as highly repetitive sources distributed throughout the fault zone suitable for monitoring the nucleation zone for possible precursory changes in physical properties that affect wave propagation. In this article we demonstrate these applications with a detailed analysis of selected clusters. RP NADEAU, R (reprint author), LAWRENCE BERKELEY LAB,DIV EARTH SCI,MS 50E,BERKELEY,CA 94720, USA. NR 43 TC 58 Z9 60 U1 1 U2 4 PU SEISMOLOGICAL SOC AMER PI EL CERRITO PA PLAZA PROFESSIONAL BLDG, SUITE 201, EL CERRITO, CA 94530 SN 0037-1106 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD APR PY 1994 VL 84 IS 2 BP 247 EP 263 PG 17 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NH746 UT WOS:A1994NH74600002 ER PT J AU GOLDSTEIN, P DENNY, MD HAUK, T JARPE, SP AF GOLDSTEIN, P DENNY, MD HAUK, T JARPE, SP TI ON-SITE SEISMIC YIELD (OSSY) ESTIMATES FOR BRISTOL BASED ON NUCLEAR TO CHEMICAL EXPLOSION SPECTRAL RATIOS AND YIELD SCALING SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Article ID NEVADA TEST SITE AB We have computed a seismic yield estimate for the nuclear explosion BRISTOL by scaling near-source seismic recordings of BRISTOL with recordings from chemical explosions. Path and near-source coupling effects were accounted for by modeling ratios of the spectra of BRISTOL and chemical explosions recorded at identical locations and detonated in nearly the same locations. We estimated BRISTOL's yield, comer frequency, and overshoot by minimizing the difference between observed spectral ratios and model spectral ratios assuming yield scaling. Based on an average of spectral ratios at six stations, and assuming an average, gas-filled porosity of 4% in the vicinity of BRISTOL's working point, we obtained a yield of 10 kt with an interstation uncertainty corresponding to an increase or decrease by a factor of 1.7. This uncertainty could probably be reduced by using sensors with better low-frequency response and chemical explosions that generated larger signal to noise ratios (SNR). This yield estimate is in good agreement with a yield estimate obtained using regional Lg waves of Y = 11. We also find a comer frequency of 2.5 Hz and no evidence of overshoot in the seismic source function. Measurements such as these help improve our understanding of explosion sources and may be important for verification of threshold and low-yield nuclear testing treaties because they are less intrusive and potentially less expensive than existing on-site methods such as Continuous Reflectometry for Radius versus Time Experiment (CORRTEX). They are also applicable to explosions of all sizes. RP GOLDSTEIN, P (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 20 TC 3 Z9 3 U1 0 U2 0 PU SEISMOLOGICAL SOC AMER PI EL CERRITO PA PLAZA PROFESSIONAL BLDG, SUITE 201, EL CERRITO, CA 94530 SN 0037-1106 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD APR PY 1994 VL 84 IS 2 BP 343 EP 349 PG 7 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NH746 UT WOS:A1994NH74600009 ER PT J AU TAYLOR, SR AF TAYLOR, SR TI FALSE ALARMS AND MINE SEISMICITY - AN EXAMPLE FROM THE GENTRY MOUNTAIN MINING REGION, UTAH SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Article ID EASTERN WASATCH PLATEAU; SURFACE-WAVES; UNITED-STATES; EXPLOSIONS; EARTHQUAKES; MODELS; SHEAR; SPALL; USA; DISCRIMINATION AB As part of a large discrimination study in the western United States (Taylor et al., 1989), one earthquake was consistently classified as an explosion. The magnitude (M) 3.5 disturbance occurred on 14 May 1981 and was conspicuous in its lack of Love waves, relative lack of high frequency energy, low Lg/Pg ratio, and high moment tensor. Additionally, a moment-tensor solution by Patton and Zandt (1991) indicated that the event had a large implosional component. The event occurred in the Gentry Mountain coal mining region in the eastern Wasatch Plateau, Utah. Previous microearthquake studies in the region have demonstrated the existence of numerous small implosional events associated with the mining activities. The event is more comparable in appearance [at the broadband station at Kanab, Utah (KNB)] to the ATRISCO collapse at the Nevada Test Site (NTS) than to another double-couple event near the mining region. Using a simple source representation, we modeled the event as a tabular excavation collapse that occurred as a result of normal mining activities. This study raises the importance of having a good catalog of seismic data and information about mining activities from potential proliferant nations. This information will be critical in resolving potential false alarms that may be generated from natural mine seismicity. RP TAYLOR, SR (reprint author), LOS ALAMOS NATL LAB,GRP EES3,LOS ALAMOS,NM 87545, USA. NR 26 TC 18 Z9 18 U1 0 U2 2 PU SEISMOLOGICAL SOC AMER PI EL CERRITO PA PLAZA PROFESSIONAL BLDG, SUITE 201, EL CERRITO, CA 94530 SN 0037-1106 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD APR PY 1994 VL 84 IS 2 BP 350 EP 358 PG 9 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NH746 UT WOS:A1994NH74600010 ER PT J AU EDWARDS, AL WYATT, R SHARITZ, RR AF EDWARDS, AL WYATT, R SHARITZ, RR TI SEED BUOYANCY AND VIABILITY OF THE WETLAND MILKWEED ASCLEPIAS-PERENNIS AND AN UPLAND MILKWEED, ASCLEPIAS-EXALTATA SO BULLETIN OF THE TORREY BOTANICAL CLUB LA English DT Article DE ASCLEPIAS; GERMINATION; HYDROCHORY; MILKWEED; SEED DISPERSAL; SEED ECOLOGY ID TERMINAL VELOCITY; DISPERSAL ABILITY; TROPICAL TREE; SIZE; GERMINATION; WIND; SEEDLINGS; WATER; HETEROGENEITY; SPERGULARIA AB Asclepias perennis, a milkweed restricted to wetlands in the southeastern United States, possesses a suite of unusual characters that represent apparent adaptations for water dispersal of seeds: the fruits are oriented downward at maturity and contain seeds with an expanded seed coat that lack the usual coma of milkweeds. Using concurrent field and greenhouse seed flotation experiments, we compared seeds of A. perennis with seeds of a typical wind-dispersed milkweed, A. exaltata. Seeds of A. perennis floated significantly longer in both greenhouse and field experiments, with 15% and 35% still floating after 5 months; almost all seeds of A. exaltata sank within 2 weeks. A second greenhouse experiment conducted under three different soil-water regimes revealed significant differences in percent germination between species (A. perennis = 85.3 +/- 0.1%: mean +/- standard error; A. exaltata = 6.2 +/- 6.2%), and, to a lesser degree, among soil-water treatments within species. Seed germination tests revealed no significant change in viability for either species in any of the experiments conducted. Milkweed seeds can remain viable in water for long periods of time, but the remarkable ability of A. perennis to remain floating for more than 6 months may provide a ''floating seed bank'' that contributes to high levels of gene flow among populations of this floodplain species. C1 SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. RP EDWARDS, AL (reprint author), UNIV GEORGIA,DEPT BOT,ATHENS,GA 30602, USA. NR 51 TC 13 Z9 16 U1 1 U2 5 PU TORREY BOTANICAL CLUB PI BRONX PA NEW YORK BOTANICAL GARDEN, BRONX, NY 10458 SN 0040-9618 J9 B TORREY BOT CLUB JI Bull. Torrey Bot. Club PD APR-JUN PY 1994 VL 121 IS 2 BP 160 EP 169 DI 10.2307/2997168 PG 10 WC Plant Sciences SC Plant Sciences GA NY138 UT WOS:A1994NY13800007 ER PT J AU TSCHAPLINSKI, TJ TUSKAN, GA AF TSCHAPLINSKI, TJ TUSKAN, GA TI WATER-STRESS TOLERANCE OF BLACK AND EASTERN COTTONWOOD CLONES AND 4 HYBRID PROGENY .2. METABOLITES AND INORGANIC-IONS THAT CONSTITUTE OSMOTIC ADJUSTMENT SO CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE LA English DT Article ID OSMOREGULATION; POPULUS; SEEDLINGS; POPLAR; WHEAT AB The biochemical bases of water-stress tolerance in a pedigree consisting of black cottonwood (Populus trichocarpa Torr. & Gray female) and eastern cottonwood (Populus deltoides Bartr. male) parental clones and four hybrid progeny were investigated. Trees were grown outdoors in pots; well-watered trees (soil water potential greater than -0.03 MPa) were kept moist in trays, and stressed trees (soil water potential less than -2.0 MPa) were subjected to repeated cyclical stress of 1 or 2 days duration over the 14-week study. Analysis of the major metabolites and ions in fully expanded leaves demonstrated that the greatest degree of osmotic adjustment was displayed by male hybrid 242, the P. deltoides male parent, and male hybrid 239 to a lesser extent. Osmotic adjustment in leaves of both hybrid 242 and the P. deltoides male parent was primarily constituted by malic acid, K, sucrose, and glucose, with the same metabolites also increasing in fine roots of hybrid 242, the only clone to display osmotic adjustment in roots. Female clone 240 and P. deltoides displayed organic solute-based adjustments to water stress that were offset by declines in inorganic ions, particularly Na and Mg. Given that the P. trichocarpa female parent did not display osmotic adjustment in either tissue, the hybrids' capacity for adjustment was likely conferred by the P. deltoides male parent. RP TSCHAPLINSKI, TJ (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Tuskan, Gerald/A-6225-2011; OI Tuskan, Gerald/0000-0003-0106-1289; Tschaplinski, Timothy/0000-0002-9540-6622 NR 20 TC 41 Z9 44 U1 0 U2 7 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0045-5067 J9 CAN J FOREST RES JI Can. J. For. Res.-Rev. Can. Rech. For. PD APR PY 1994 VL 24 IS 4 BP 681 EP 687 DI 10.1139/x94-091 PG 7 WC Forestry SC Forestry GA NR019 UT WOS:A1994NR01900005 ER PT J AU RON, E TARONE, RE MODAN, B CHAKI, R ALFANDARY, E PARRY, DM MAKAR, M SETLOW, N MULVIHILL, JJ MILLER, RW SETLOW, RB AF RON, E TARONE, RE MODAN, B CHAKI, R ALFANDARY, E PARRY, DM MAKAR, M SETLOW, N MULVIHILL, JJ MILLER, RW SETLOW, RB TI IN-VITRO RADIOSENSITIVITY OF FIBROBLASTS FROM THYROID AND SKIN-CANCER PATIENTS TREATED WITH X-RAYS FOR TINEA-CAPITIS SO CANCER EPIDEMIOLOGY BIOMARKERS & PREVENTION LA English DT Article ID ATAXIA TELANGIECTASIA HETEROZYGOTES; RADIATION; IDENTIFICATION; HEAD; NECK AB To investigate the hypothesis that persons who developed thyroid or skin cancer subsequent to scalp irradiation for tinea capitis are particularly sensitive to radiation, possibly because of a high frequency of ataxia-telagiectasia, we used an in vitro cell survival assay to evaluate radiosensitivity of their fibroblast cell strains. Study subjects were selected from a cohort of 10,834 Israelis irradiated during childhood for tinea capitis. Skin fibroblasts were obtained from thyroid and skin cancer patients (cases) as well as a sample of subjects who did not have cancer (controls). Fibroblasts were cultured and then loss of colony-forming ability as a result of acute X-irradiation was evaluated. Comparison of survival curve parameters (mean inverse of the slope and the dose needed to reduce colony survival to 10%) between 12 thyroid cancer and 12 control strains showed no differences (P > 0.5). A slightly increased radiation sensitivity of the skin cancer cases compared with their controls was observed. Although based on few subjects (14 cases and 11 controls), the findings were similar whether the mean inverse of the slope (P = 0.06) or the dose needed to reduce colony survival to 10% (P = 0.05) was evaluated. However, because of the small size of the study and potential errors inherent in survival assays, our finding that cell strains derived from patients who developed skin cancer exhibit enhanced radiosensitivity should be viewed as preliminary and interpreted cautiously. C1 NCI,EPIDEMIOL & BIOSTAT PROGRAM,BETHESDA,MD 20892. CHAIM SHEBA MED CTR,DEPT CLIN EPIDEMIOL,IL-52621 TEL HASHOMER,ISRAEL. CHAIM SHEBA MED CTR,DEPT GENET,IL-52621 TEL HASHOMER,ISRAEL. BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. UNIV PITTSBURGH,DEPT HUMAN GENET,PITTSBURGH,PA 15260. RP RON, E (reprint author), NCI,DIV CANC ETIOL,6130 EXECUT BLVD,EPN 408,ROCKVILLE,MD 20852, USA. FU NCI NIH HHS [N01-CP-01042] NR 20 TC 5 Z9 5 U1 0 U2 0 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 1055-9965 J9 CANCER EPIDEM BIOMAR JI Cancer Epidemiol. Biomarkers Prev. PD APR-MAY PY 1994 VL 3 IS 3 BP 229 EP 232 PG 4 WC Oncology; Public, Environmental & Occupational Health SC Oncology; Public, Environmental & Occupational Health GA NE773 UT WOS:A1994NE77300008 PM 8019372 ER PT J AU QUINBYHUNT, MS WILDE, P AF QUINBYHUNT, MS WILDE, P TI THERMODYNAMIC ZONATION IN THE BLACK SHALE FACIES BASED ON IRON-MANGANESE VANADIUM CONTENT SO CHEMICAL GEOLOGY LA English DT Review ID NORMAL MARINE SHALES; HF-TA DIAGRAM; ORGANIC-MATTER; SULFATE REDUCTION; METHANE PRODUCTION; PROGRESSIVE VENTILATION; CRUSTAL CONTAMINATION; NORTHEAST PACIFIC; SEDIMENTARY-ROCKS; PHANEROZOIC TIME AB The black shale facies contains several discrete chemical groupings of Mn, Fe and V in visually similar rocks. These groups are related to four thermodynamic zones based on changing pE and pH, are identified from a collection of approximately 200 Paleozoic and Mesozoic finely-laminated, low-calcic ([Ca] < 0.4%) black shales. The low-calcic nature of this data set permits the simplifying assumption that CaCO3 is not present as a significant complicating factor. The relative variations in the concentrations of Mn and Fe can be used as indicators of pE-pH conditions. In Group 1 (oxic conditions: high pE), Mn and Fe occur as Mn(III, IV)- and Fe(III)-oxides, and appear in relatively high concentrations (average concentrations 1,300 and 56,000 ppm, respectively). In Group 2 (anoxic: nitrate-reducing to sulfate-reducing at intermediate pH), Mn is reduced to Mn2+ as is evidenced by low Mn concentration (310 ppm average); in Group 2, Fe remains bound in oxides or sulfides with concentrations comparable to those in Group 1 (52,000 ppm). In Group 3, both Mn and Fe are reduced and relatively soluble, reflecting anoxic, but non-sulfate reducing, pE at intermediate to low pH. This solubility, and Mn and Fe species instability, is shown in lower average concentrations 170 and 23,000 ppm, respectively, in Group-3 sediments. Group-4 black shales have V concentrations > 300 ppm, averaging 1500 ppm and indicating deposition under conditions of high organic preservation. Mn and Fe concentrations are low - the Mn concentration is < 260 ppm and averages 80 ppm; Fe is < 36,000 and averages 19,000 ppm. The high V concentration with the relatively low Mn and Fe content suggests low pH and possible methanogenesis at low pE. This study demonstrates the wide variety of black shale depositional environments from oxic to methanic. Accordingly, black shales cannot all be assigned to anoxic, sulfidic environments without additional chemical analysis and interpretation. C1 OFF NAVAL RES,ASIAN OFF,MINATO KU,TOKYO 106,JAPAN. RP QUINBYHUNT, MS (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 100 TC 50 Z9 51 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2541 J9 CHEM GEOL JI Chem. Geol. PD APR 1 PY 1994 VL 113 IS 3-4 BP 297 EP 317 DI 10.1016/0009-2541(94)90072-8 PG 21 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA ND960 UT WOS:A1994ND96000007 ER PT J AU COLUMBIA, MR THIEL, PA AF COLUMBIA, MR THIEL, PA TI THE STABILIZATION OF FORMATE ON PT(111) BY COADSORBED ATOMIC OXYGEN SO CHEMICAL PHYSICS LETTERS LA English DT Article ID FORMIC-ACID; SOLID-SURFACES; FORMALDEHYDE; WATER; ADSORPTION; SPECTROSCOPY; NI(110); RH(111); RU(001); HCOOH AB We have studied the stabilization of adsorbed formate in the presence of coadsorbed atomic oxygen on Pt(111) using the techniques of thermal desorption spectroscopy and high-resolution electron energy loss spectroscopy. The increased stability manifests itself in two primary ways: the temperatures at which formic acid converts to formate, and formate converts to gaseous CO2, are lower and higher, respectively, than in the absence of oxygen; and the saturation yields of dehydrogenation products are approximately five times greater than those produced on the clean surface. The latter effect is coupled to an apparent increase in the sticking coefficient of the molecular acid. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 30 TC 9 Z9 9 U1 0 U2 8 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 APR 1 PY 1994 VL 220 IS 3-5 BP 167 EP 171 DI 10.1016/0009-2614(94)00165-0 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA ND446 UT WOS:A1994ND44600004 ER PT J AU KOURI, DJ WEI, Z HUANG, YH HOFFMAN, DK AF KOURI, DJ WEI, Z HUANG, YH HOFFMAN, DK TI ANALYTICAL EVALUATION OF THE ENERGY DERIVATIVE OF THE S-MATRIX IN THE TIME-INDEPENDENT WAVEPACKET APPROACH TO QUANTUM SCATTERING SO CHEMICAL PHYSICS LETTERS LA English DT Article ID REACTIVE SCATTERING; RESONANCES; COLLISIONS; PROPAGATOR; VERSION; DELAYS AB We consider the evaluation of energy derivatives of the S matrix, dS (E) /dE, using our recently developed time-independent wavepacket (TIW) theory of quantum scattering. This approach, combined with a polynomial representation of the full time-independent Green function, results in analytical expressions for the energy dependence of S(E), and dS(E)/dE. Specific expressions are based on Chebychev polynomials, but the approach is general, for any choice of orthogonal polynomials. Analytical expressions for S(E) and dS(E)/dE make possible simultaneous evaluation of the lifetime or time-delay matrix and the S-matrix for any energies desired. C1 UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP KOURI, DJ (reprint author), UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204, USA. NR 23 TC 8 Z9 8 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD APR 1 PY 1994 VL 220 IS 3-5 BP 312 EP 318 DI 10.1016/0009-2614(94)00152-9 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA ND446 UT WOS:A1994ND44600029 ER PT J AU ATAGI, LM HOFFMAN, DM LIU, JR ZHENG, ZS CHU, WK RUBIANO, RR SPRINGER, RW SMITH, DC AF ATAGI, LM HOFFMAN, DM LIU, JR ZHENG, ZS CHU, WK RUBIANO, RR SPRINGER, RW SMITH, DC TI HOMOLEPTIC TIN AND SILICON AMIDO COMPOUNDS AS PRECURSORS FOR LOW-TEMPERATURE ATMOSPHERIC-PRESSURE CHEMICAL-VAPOR-DEPOSITION OF TIN AND SILICON-OXIDE THIN-FILMS SO CHEMISTRY OF MATERIALS LA English DT Note ID TETRAMETHYLTIN; OXIDATION; CVD; PASSIVATION AB Main-group amido complexes are reactive sources of the main-group elements in CVD processes. This is illustrated by reacting Sn(NMe2)4 and Si(NMe2)4 with oxygen in an atmospheric pressure chemical vapor deposition reactor to give nearly stoichiometric tin and silicon oxide films at low substrate temperatures. C1 UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204. UNIV HOUSTON,TEXAS CTR SUPERCONDUCT,HOUSTON,TX 77204. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 24 TC 16 Z9 17 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD APR PY 1994 VL 6 IS 4 BP 360 EP 361 DI 10.1021/cm00040a005 PG 2 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA NJ396 UT WOS:A1994NJ39600005 ER PT J AU SUIB, SL ITON, LE AF SUIB, SL ITON, LE TI MAGNETIC STUDIES OF MANGANESE OXIDE OCTAHEDRAL MOLECULAR-SIEVES - A NEW CLASS OF SPIN-GLASSES SO CHEMISTRY OF MATERIALS LA English DT Article ID PARTICLES; COMPLEX AB Ac and dc magnetic susceptibility measurements of octahedral molecular sieves (OMS) of mixed-valent manganese oxide composition such as (Mg2+0.981-1.35Mn2+1.89-1.94Mn4+4.38-4.54)O12.4.47-4.55H2O for synthetic todorokite and KMn8O16 for synthetic cryptomelane are reported here. Data for temperature and frequency dependence of the real components of the ac susceptibility suggest that synthetic cryptomelane (K-OMS-2) materials are spin glasses having a typical T(f)(omega) dependence. The imaginary components of the ac susceptibility at various frequencies also show behavior that is typical of spin glass systems. Zero-field-cooled and field-cooled dc magnetization data as a function of temperature exhibit irreversibility, again consistent with the spin glass assignment for synthetic cryptomelane. Synthetic todorokite having a 3 x 3 MnO6 octahedral tunnel structure does not appear to be a true spin glass. C1 UNIV CONNECTICUT,INST MAT SCI,STORRS,CT 06269. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP SUIB, SL (reprint author), UNIV CONNECTICUT,DEPT CHEM ENGN,DEPT CHEM,U-60,STORRS,CT 06269, USA. NR 51 TC 27 Z9 27 U1 2 U2 11 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD APR PY 1994 VL 6 IS 4 BP 429 EP 433 DI 10.1021/cm00040a016 PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA NJ396 UT WOS:A1994NJ39600016 ER PT J AU HEALY, MD SMITH, DC RUBIANO, RR ELLIOTT, NE SPRINGER, RW AF HEALY, MD SMITH, DC RUBIANO, RR ELLIOTT, NE SPRINGER, RW TI USE OF TETRANEOPENTYLCHROMIUM AS A PRECURSOR FOR THE ORGANOMETALLIC CHEMICAL-VAPOR-DEPOSITION OF CHROMIUM CARBIDE - A REINVESTIGATION SO CHEMISTRY OF MATERIALS LA English DT Article ID LOW-TEMPERATURE; THIN-FILMS; TITANIUM AB Thin films of chromium carbide have been grown by organometallic chemical vapor deposition (OMCVD) from tetraneopentylchromium (Cr[CH2C(CH3)3]4, CrNp4). Deposition was performed in a hot wall, low pressure reactor at 520 and 570-degrees-C and a pressure of 1.33 X 10(-2) Pa (10(-4) Torr). No carrier gas was used. The resulting films were characterized by X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), X-ray diffraction (XRD), scanning electron microscopy (SEM), and elastic recoil detection (ERD). These data show that the films are of high quality, with very low oxygen content, and contain some residual amorphous carbon. Films grown at 570-degrees-C are crystalline. The observed crystalline phase is Cr7C3. C1 LOS ALAMOS NATL LAB,CST-3,MS C346,LOS ALAMOS,NM 87545. MIT,DEPT NUCL MED,CAMBRIDGE,MA 02139. NR 15 TC 18 Z9 18 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD APR PY 1994 VL 6 IS 4 BP 448 EP 453 DI 10.1021/cm00040a019 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA NJ396 UT WOS:A1994NJ39600019 ER PT J AU KAUFMAN, EN SCOTT, CD AF KAUFMAN, EN SCOTT, CD TI LIQUEFY COAL WITH ENZYME CATALYSTS SO CHEMTECH LA English DT Article ID LIQUEFACTION RP KAUFMAN, EN (reprint author), OAK RIDGE NATL LAB,CTR BIOPROC RES & DEV,OAK RIDGE,TN 37831, USA. NR 25 TC 1 Z9 1 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0009-2703 J9 CHEMTECH JI Chemtech PD APR PY 1994 VL 24 IS 4 BP 27 EP 32 PG 6 WC Chemistry, Applied SC Chemistry GA NG971 UT WOS:A1994NG97100006 ER PT J AU MEYNE, J GOODWIN, EH MOYZIS, RK AF MEYNE, J GOODWIN, EH MOYZIS, RK TI CHROMOSOME LOCALIZATION AND ORIENTATION OF THE SIMPLE SEQUENCE REPEAT OF HUMAN SATELLITE-I DNA SO CHROMOSOMA LA English DT Article ID ALPHOID DNA; INSITU HYBRIDIZATION; HUMAN CENTROMERES; (TTAGGG)N AB The predominant chromosomal locations of human satellite T DNA were detected using fluorescent in situ hybridization (FISH). Synthetic deoxyoligonucleotides designed from consensus sequences of the simple sequence repeats of satellite 1 were used as probes. The most abundant satellite I repeat, the -A-B-A-B-A- form, is located at the pericentromeric regions of chromosomes 3, 4, 13, 14, 15, 21, and 22. The less abundant -B-B-B-form was not detected on chromosome 4, but was present at all the other locations. A variation of FISH that allows strand-specific hybridization of single-stranded probes (CO-FISH) determined that the human satellite I sequences are predominantly arranged in head-to-tail fashion along the DNA strand. C1 LOS ALAMOS NATL LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87545. RP MEYNE, J (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545, USA. NR 20 TC 25 Z9 26 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0009-5915 J9 CHROMOSOMA JI Chromosoma PD APR PY 1994 VL 103 IS 2 BP 99 EP 103 DI 10.1007/BF00352318 PG 5 WC Biochemistry & Molecular Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Genetics & Heredity GA NJ739 UT WOS:A1994NJ73900004 PM 8055716 ER PT J AU CHASIS, JA MCGEE, S COULOMBEL, L TCHERNIA, G MOHANDAS, N AF CHASIS, JA MCGEE, S COULOMBEL, L TCHERNIA, G MOHANDAS, N TI DEVELOPMENTAL-SPECIFIC UTILIZATION OF PROTEIN 4.1 TRANSLATION INITIATION SITES DURING ERYTHROPOIESIS SO CLINICAL RESEARCH LA English DT Meeting Abstract C1 UNIV CALIF SAN FRANCISCO,SAN FRANCISCO,CA 94143. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 SN 0009-9279 J9 CLIN RES JI Clin. Res. PD APR PY 1994 VL 42 IS 2 BP A238 EP A238 PG 1 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA NF020 UT WOS:A1994NF02000721 ER PT J AU DANAHY, JF LEE, X SCOTT, G DIMRI, GP CAMPISI, J PEACOCKE, M AF DANAHY, JF LEE, X SCOTT, G DIMRI, GP CAMPISI, J PEACOCKE, M TI A BIOMARKER OF HUMAN CELLULAR AGING, IN-VIVO AND IN-VITRO SO CLINICAL RESEARCH LA English DT Meeting Abstract C1 TUFTS UNIV NEW ENGLAND MED CTR,DEPT DERMATOL,BOSTON,MA 02111. UNIV ROCHESTER,SCH MED,DEPT DERMATOL,ROCHESTER,NY 14627. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 SN 0009-9279 J9 CLIN RES JI Clin. Res. PD APR PY 1994 VL 42 IS 2 BP A217 EP A217 PG 1 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA NF020 UT WOS:A1994NF02000602 ER PT J AU CARD, JM ASHURST, WT WILLIAMS, FA AF CARD, JM ASHURST, WT WILLIAMS, FA TI MODIFICATION OF METHANE AIR NONPREMIXED FLAMELETS BY VORTICAL INTERACTIONS SO COMBUSTION AND FLAME LA English DT Article ID DIFFUSION FLAMES; ASYMPTOTIC STRUCTURE; EXTINCTION AB The structure of a nonpremixed methane-air flame interacting with a vortex is described by a two-step reduced mechanism. The mixture-fraction field Z for the flamelet is approximated by a stretched parabola. This synthetic mixture-fraction field is used to relate the vortex swirl velocity to the tangential velocity along the flamelet and to identify a rate of scalar dissipation chi appropriate for the parabolically shaped flame tongue. The flame temperature and chi along the tongue are calculated in the context of rate-ratio asymptotics. It is found that the peak temperatures, and hence the smallest chi, occur at the flame tip. In addition, analytical estimates are made to evaluate the importance of the transverse convective effects in the reaction zone relative to the usually assumed diffusive-reactive balance. Away from the tip of the flame tongue but near it, the influences of transverse convection are important, but the relative magnitude of these effects is dependent on the curvature kappa of the flamelet as well as on the spacing l between the mixture-fraction contour of the oxidizer stream (Z = 0) and that of the fuel stream (Z = 1); the convective influence becomes more pronounced as kappa and/or l is increased. However, the estimates show that the importance of transverse convection is not as large as would be indicated using activation-energy asymptotics. RP CARD, JM (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. NR 19 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0010-2180 J9 COMBUST FLAME JI Combust. Flame PD APR PY 1994 VL 97 IS 1 BP 48 EP 60 DI 10.1016/0010-2180(94)90115-5 PG 13 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA NN986 UT WOS:A1994NN98600004 ER PT J AU CAMP, WJ PLIMPTON, SJ HENDRICKSON, BA LELAND, RW AF CAMP, WJ PLIMPTON, SJ HENDRICKSON, BA LELAND, RW TI MASSIVELY-PARALLEL METHODS FOR ENGINEERING AND SCIENCE PROBLEMS SO COMMUNICATIONS OF THE ACM LA English DT Article ID MOLECULAR-DYNAMICS C1 SANDIA NATL LABS,MASSIVELY PARALLEL COMP RES LAB,ALBUQUERQUE,NM 87185. RP CAMP, WJ (reprint author), SANDIA NATL LABS,DEPT PARALLEL COMPUTAT SCI,ALBUQUERQUE,NM 87185, USA. NR 16 TC 16 Z9 16 U1 0 U2 1 PU ASSOC COMPUTING MACHINERY PI NEW YORK PA 1515 BROADWAY, NEW YORK, NY 10036 SN 0001-0782 J9 COMMUN ACM JI Commun. ACM PD APR PY 1994 VL 37 IS 4 BP 31 EP 41 PG 11 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA ND962 UT WOS:A1994ND96200009 ER PT J AU TENTNER, AM BLOMQUIST, RN CANFIELD, TR GARNER, PL GELBARD, EM GROSS, KC MINKOFF, M VALENTIN, RA AF TENTNER, AM BLOMQUIST, RN CANFIELD, TR GARNER, PL GELBARD, EM GROSS, KC MINKOFF, M VALENTIN, RA TI ADVANCES IN PARALLEL COMPUTING FOR REACTOR ANALYSIS AND SAFETY SO COMMUNICATIONS OF THE ACM LA English DT Article RP TENTNER, AM (reprint author), ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439, USA. NR 14 TC 2 Z9 2 U1 0 U2 0 PU ASSOC COMPUTING MACHINERY PI NEW YORK PA 1515 BROADWAY, NEW YORK, NY 10036 SN 0001-0782 J9 COMMUN ACM JI Commun. ACM PD APR PY 1994 VL 37 IS 4 BP 55 EP 64 PG 10 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA ND962 UT WOS:A1994ND96200011 ER PT J AU VAIDYA, RU VENKATESH, R CHAWLA, KK AF VAIDYA, RU VENKATESH, R CHAWLA, KK TI THERMAL-EXPANSION OF A PRD-166 FIBER-REINFORCED GLASS-MATRIX COMPOSITE SO COMPOSITES LA English DT Article DE GLASS-MATRIX COMPOSITES; COEFFICIENT OF THERMAL EXPANSION; FIBER VOLUME FRACTION; FIBER COATING; ALUMINA FIBERS ID MICROMECHANICS AB Coefficients of thermal expansion (CTEs) of PRD-166/glass and SnO2-coated PRD-166/glass composites were measured as a function of fibre volume fraction, and these experimental values of CTE compared with those predicted using various models. Schapery's model was found to predict the CTE values of the SnO2-coated fibre composites more accurately. None of the models were successful in predicting the CTE of the uncoated fibre composites because of the chemical reactivity between the fibre and matrix. The effect of fibre misorientation and fibre breakage on the CTE of the composites was also investigated. Fibre breakage induced during composite fabrication was found to affect the CTE more significantly than the processing-induced fibre misorientation in these composite systems. This was because the constraint on expansion exerted by short (broken) fibres is less than that due to long continuous fibres, C1 NEW MEXICO INST MIN & TECHNOL,DEPT MAT & MET ENGN,SOCORRO,NM 87801. RP VAIDYA, RU (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 23 TC 2 Z9 2 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0010-4361 J9 COMPOSITES JI Composites PD APR PY 1994 VL 25 IS 4 BP 308 EP 313 DI 10.1016/0010-4361(94)90224-0 PG 6 WC Materials Science, Composites SC Materials Science GA NB031 UT WOS:A1994NB03100008 ER PT J AU ATTENBERGER, SE HIRSHMAN, SP HOULBERG, WA AF ATTENBERGER, SE HIRSHMAN, SP HOULBERG, WA TI MACH - A COMPUTER CODE FOR SOLUTION OF THE POLOIDAL ASYMMETRY EIGENVALUE PROBLEM IN TOKAMAKS SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article AB Evaluation of the poloidal dependence of the plasma density involves solving the equation for momentum balance along the magnetic field. This is transformed into an eigenvalue equation of the Mathieu type with an extra damping term. The method presented here for determination of the appropriate eigenvalue is much faster than traditional matrix determinant methods. RP ATTENBERGER, SE (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0010-4655 J9 COMPUT PHYS COMMUN JI Comput. Phys. Commun. PD APR PY 1994 VL 79 IS 2 BP 341 EP 350 DI 10.1016/0010-4655(94)90077-9 PG 10 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA NK036 UT WOS:A1994NK03600014 ER PT J AU SIERADZKI, K FRIEDERSDORF, FJ AF SIERADZKI, K FRIEDERSDORF, FJ TI NOTES ON THE SURFACE MOBILITY MECHANISM OF STRESS-CORROSION CRACKING SO CORROSION SCIENCE LA English DT Article ID THERMOCHEMICAL EQUILIBRIUM; LINEAR THEORY; SOLIDS; FRACTURE; GROWTH AB A critical examination of the surface mobility mechanism of stress-corrosion cracking of Galvele is presented. Using arguments based upon the thermodynamics of stressed solids serious errors in the development are elucidated and an accurate analysis of his ideas is presented. It is shown that the original treatment of surface mobility overestimates stress-corrosion crack velocities in ductile fee metals by about 14 orders of magnitude. C1 US BUR MINES,ALBANY RES CTR,ALBANY,OR 97321. RP SIERADZKI, K (reprint author), UNIV MARYLAND,DEPT MAT & NUCL ENGN,COLLEGE PK,MD 20742, USA. NR 17 TC 20 Z9 21 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0010-938X J9 CORROS SCI JI Corrosion Sci. PD APR PY 1994 VL 36 IS 4 BP 669 EP 675 DI 10.1016/0010-938X(94)90072-8 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NF555 UT WOS:A1994NF55500009 ER PT J AU BRIGMON, RL BITTON, G ZAM, SG MARTIN, HW OBRIEN, B AF BRIGMON, RL BITTON, G ZAM, SG MARTIN, HW OBRIEN, B TI IDENTIFICATION, ENRICHMENT, AND ISOLATION OF THIOTHRIX SPP FROM ENVIRONMENTAL-SAMPLES SO CURRENT MICROBIOLOGY LA English DT Article ID FILAMENTOUS BACTERIA AB We have developed a method to enrich, isolate, and identify Thiothrix spp. in environmental samples. This procedure employs low concentrations of organic compounds, the addition of reduced sulfur compounds (sulfide or thiosulfate), and preparation with spring water that contains Thiothrix spp. The enrichment enhanced identification of Thiothrix spp. by promoting deposition of intracellular sulfur granules and inhibiting overgrowth by other bacteria. The relatively high calcium content of the spring water contributed to the culture procedure. With this technique, Thiothrix spp. were observed in two activated sludge systems, a municipal water storage tank, three springs, and four underground freshwater caves in the phreatic zone of the Floridan aquifer. Two different Thiothrix cultures have been isolated from a freshwater cave and a water storage tank by this procedure. It appears that media prepared with spring water known to support Thiothrix spp. can be designed to provide highly selective methods for isolation of Thiothrix spp. from a wide range of environments. C1 UNIV FLORIDA,DEPT ENVIRONM ENGN SCI,GAINESVILLE,FL 32611. UNIV FLORIDA,DEPT MICROBIOL & CELL SCI,GAINESVILLE,FL 32611. UNIV FLORIDA,INTERDISCIPLINARY CTR BIOTECHNOL RES,GAINESVILLE,FL. UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,AIKEN,SC. NR 8 TC 4 Z9 5 U1 1 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0343-8651 J9 CURR MICROBIOL JI Curr. Microbiol. PD APR PY 1994 VL 28 IS 4 BP 243 EP 246 DI 10.1007/BF01575968 PG 4 WC Microbiology SC Microbiology GA MY670 UT WOS:A1994MY67000009 ER PT J AU VISCO, SJ DEJONGHE, LC UE, M AF VISCO, SJ DEJONGHE, LC UE, M TI A NEW TREND ON ELECTROACTIVE POLYMER RESEARCH .2. A NEW CONCEPT OF ENERGY-STORAGE MATERIAL - DISULFIDE POLYMER SO DENKI KAGAKU LA Japanese DT Article ID ALL-SOLID-STATE; ELECTROCHEMICAL PROPERTIES; THIN-FILM; ELECTRODES; BATTERIES RP VISCO, SJ (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 23 TC 1 Z9 1 U1 0 U2 0 PU ELECTROCHEMICAL SOC JAPAN PI TOKYO PA 12-1 1 CHOME YURAKU-CHO, CHIYODA-KU, TOKYO 100, JAPAN SN 0366-9297 J9 DENKI KAGAKU JI Denki Kagaku PD APR PY 1994 VL 62 IS 4 BP 300 EP 304 PG 5 WC Electrochemistry SC Electrochemistry GA NG064 UT WOS:A1994NG06400002 ER PT J AU DEANGELIS, DL AF DEANGELIS, DL TI INTEGRATION OF ECOSYSTEM THEORIES - A PATTERN - JORGENSEN,SE SO ECOLOGICAL ECONOMICS LA English DT Book Review RP DEANGELIS, DL (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 3 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8009 J9 ECOL ECON JI Ecol. Econ. PD APR PY 1994 VL 9 IS 3 BP 276 EP 277 DI 10.1016/0921-8009(94)90087-6 PG 2 WC Ecology; Economics; Environmental Sciences; Environmental Studies SC Environmental Sciences & Ecology; Business & Economics GA NG457 UT WOS:A1994NG45700015 ER PT J AU SUTHERLAND, RJ AF SUTHERLAND, RJ TI ENERGY EFFICIENCY OR THE EFFICIENT USE OF ENERGY-RESOURCES SO ENERGY SOURCES LA English DT Article DE ECONOMIC EFFICIENCY; ENERGY EFFICIENCY AB This article distinguishes between energy efficiency and the economically efficient use of energy resources. Policies intended to enhance energy efficiency are unlikely to contribute to the economically efficient use of energy and are therefore likely to waste resources. Policies that enhance the economic efficiency with which resources are used may increase or decrease energy efficiency, or leave it unaffected. The implication is that energy efficiency and economic efficiency are different policy goals, one promoting the use of fewer energy resources, the other promoting the efficient use of all resources. RP SUTHERLAND, RJ (reprint author), ARGONNE NATL LAB,955 LENFANT PLAZA N SW,SUITE 6000,WASHINGTON,DC 20024, USA. NR 12 TC 12 Z9 12 U1 0 U2 1 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0090-8312 J9 ENERG SOURCE JI Energy Sources PD APR-JUN PY 1994 VL 16 IS 2 BP 257 EP 268 DI 10.1080/00908319408909076 PG 12 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA NR791 UT WOS:A1994NR79100006 ER PT J AU EVANS, LS CANTARELLA, VA KASZCZAK, L KREMPASKY, SM THOMPSON, KH AF EVANS, LS CANTARELLA, VA KASZCZAK, L KREMPASKY, SM THOMPSON, KH TI EPIDERMAL BROWNING OF SAGUARO CACTI (CARNEGIEA-GIGANTEA) - PHYSIOLOGICAL-EFFECTS, RATES OF BROWNING AND RELATION TO SUN SHADE CONDITIONS SO ENVIRONMENTAL AND EXPERIMENTAL BOTANY LA English DT Article DE CARNEGIEA-GIGANTEA (ENGELM) BRITT AND ROSE; SAGUAROS; EPIDERMAL BROWNING; NOCTURNAL ACID ACCUMULATION RATES; SUN SHADE CONDITIONS ID PAR INTERCEPTION AB There has been increased morbidity of saguaro cacti (Carnegiea gigantea) in some portions of the Sonoran Desert. Injury to individual cacti is characterized by accumulations of epicuticular waxes that obstruct stomata and lead to eventual browning of surfaces. The purpose of this research was to determine physiological effects of obstructed stomata, rates of epidermal browning, and the relationship between epidermal browning and sun/shade conditions of stem surfaces. Nocturnal acid accumulation was positively correlated with visible stomatal density and negatively correlated with characteristics of epidermal browning. Numbers of chloroplasts per cell were higher for green cacti compared with yellow or browning stems. Over a two-year period, thickness of the green chlorenchyma decreased 1.8 mm while the thickness of internal discoloration increased 2.7 mm. Rib crest scaling and barking increased markedly along with a deterioration of spines and areoles over the period. Cacti with sun-exposed south-facing surfaces had 19% greater internal discoloration than cacti at least partially shaded by vegetation. On average, sun-exposed cacti had 20% more surface injuries on crests and troughs on south-facing surfaces compared with similar surfaces of shaded saguaros. Results reported herein support the hypothesis that morbidity of some saguaros is occurring at a measurable rate and is related to sun exposure. C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RP EVANS, LS (reprint author), MANHATTAN COLL,PLANT MORPHOGENESIS LAB,BRONX,NY 10471, USA. NR 14 TC 13 Z9 13 U1 2 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0098-8472 J9 ENVIRON EXP BOT JI Environ. Exp. Bot. PD APR PY 1994 VL 34 IS 2 BP 107 EP 115 DI 10.1016/0098-8472(94)90030-2 PG 9 WC Plant Sciences; Environmental Sciences SC Plant Sciences; Environmental Sciences & Ecology GA NK014 UT WOS:A1994NK01400001 ER PT J AU GOYER, RA EPSTEIN, S BHATTACHARYYA, M KORACH, KS POUNDS, J AF GOYER, RA EPSTEIN, S BHATTACHARYYA, M KORACH, KS POUNDS, J TI ENVIRONMENTAL RISK-FACTORS FOR OSTEOPOROSIS SO ENVIRONMENTAL HEALTH PERSPECTIVES LA English DT Editorial Material C1 ALBERT EINSTEIN MED CTR,DIV ENDOCRINOL & METAB,PHILADELPHIA,PA 19141. ARGONNE NATL LAB,ARGONNE,IL 60439. WAYNE STATE UNIV,INST CHEM TOXICOL,DETROIT,MI 48201. RP GOYER, RA (reprint author), NIEHS,POB 12233,RES TRIANGLE PK,NC 27709, USA. OI Pounds, Joel/0000-0002-6616-1566; Korach, Kenneth/0000-0002-7765-418X NR 0 TC 30 Z9 33 U1 1 U2 1 PU NATL INST ENVIRON HEALTH SCI PI RES TRIANGLE PK PA PO BOX 12233, RES TRIANGLE PK, NC 27709 SN 0091-6765 J9 ENVIRON HEALTH PERSP JI Environ. Health Perspect. PD APR PY 1994 VL 102 IS 4 BP 390 EP 394 DI 10.2307/3431628 PG 5 WC Environmental Sciences; Public, Environmental & Occupational Health; Toxicology SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Toxicology GA NP808 UT WOS:A1994NP80800009 PM 7925179 ER PT J AU BRECKENRIDGE, RP KECK, JF WILLIAMS, JR AF BRECKENRIDGE, RP KECK, JF WILLIAMS, JR TI CHARACTERIZING SOILS FOR HAZARDOUS-WASTE SITE ASSESSMENTS SO ENVIRONMENTAL MONITORING AND ASSESSMENT LA English DT Article AB This paper provides a review and justification of the minimum data needed to characterize soils for hazardous waste site assessments and to comply with the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA). Scientists and managers within the regulatory agency and the liable party need to know what are the important soil characteristics needed to make decisions about risk assessment, what areas need remediation and what remediation options are available. If all parties involved in characterizing a hazardous waste site can agree on the required soils data set prior to starting a site investigation, data can be collected in a more efficient and less costly manner. Having the proper data will aid in reaching decisions on how to address concerns at, and close-out, hazardous waste sites. This paper was prepared to address two specific concerns related to soil characterization for CERCLA remedial response. The first concern is the applicability of traditional soil classification methods to CERCLA soil characterization. The second is the identification of soil characterization data type required for CERCLA risk assessment and analysis of remedial alternatives. These concerns are related, in that the Data Quality Objective (DQO) process addresses both. The DQO process was developed in part to assist CERCLA decision-makers in identifying the data types, data quality, and data quantity required to support decisions that must be made during the remedial investigation/feasibility study (RI/FS) process. Data Quality Objectives for Remedial Response Activities: Development Process (US EPA, 1987a) is a guidebook on developing DQOs. This process as it relates to CERCLA soil characterization is discussed in the Data Quality Objective Section of this paper. RP BRECKENRIDGE, RP (reprint author), IDAHO NATL ENGN LAB,ENVIRONM SCI & TECHNOL GRP,IDAHO FALLS,ID 83415, USA. NR 0 TC 1 Z9 1 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0167-6369 J9 ENVIRON MONIT ASSESS JI Environ. Monit. Assess. PD APR PY 1994 VL 30 IS 2 BP 113 EP 138 DI 10.1007/BF00545618 PG 26 WC Environmental Sciences SC Environmental Sciences & Ecology GA PH761 UT WOS:A1994PH76100002 PM 24213742 ER PT J AU KE, HYD ANDERSON, WL MONCRIEF, RM RAYSON, GD JACKSON, PJ AF KE, HYD ANDERSON, WL MONCRIEF, RM RAYSON, GD JACKSON, PJ TI LUMINESCENCE STUDIES OF METAL ION-BINDING SITES ON DATURA-INNOXIA BIOMATERIAL SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID EU(III) LUMINESCENCE; RAT ONCOMODULIN; ALGAE; SPECTROSCOPY AB The metal ion-binding interactions between a series of metal ions and Datura innoxia cell wall fragments have been investigated using Eu3+ luminescence. An affinity order of Cu2+ similar to Ag+ > Ni2+ > Cd2+ > Eu3+ > Sr2+ > Ba2+ for total metal ion binding to D. innoxia cell material has been obtained when pH greater than or equal to 5. Both electrostatic and complexation interactions have been verified to be involved in metal ion-binding interactions. Carboxylate groups have been demonstrated to be the dominant functional group responsible for the binding of most of the metal ions studied. At least two binding sites have been demonstrated to be involved in the binding of Ag+ at different Ag+ concentrations. One site is pH-independent and displays a greater affinity with a lower availability than-the other, which is pH-dependent. The studies of competative uptake by carboxylate groups between Eu3+ and the metal ions studied demonstrate an affinity order of Cu2+ > Agn > Ni2+ > Sr2+ > Ba2+ > Cd2+. C1 NEW MEXICO STATE UNIV,DEPT CHEM & BIOCHEM,LAS CRUCES,NM 88003. LOS ALAMOS NATL LAB,DIV LIFE SCI,GENOM & STRUCT BIOL GRP,LOS ALAMOS,NM 87545. NR 27 TC 23 Z9 25 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD APR PY 1994 VL 28 IS 4 BP 586 EP 591 DI 10.1021/es00053a009 PG 6 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA ND550 UT WOS:A1994ND55000013 PM 22196539 ER PT J AU FRANCIS, AJ DODGE, CJ LU, FL HALADA, GP CLAYTON, CR AF FRANCIS, AJ DODGE, CJ LU, FL HALADA, GP CLAYTON, CR TI XPS AND XANES STUDIES OF URANIUM REDUCTION BY CLOSTRIDIUM SP SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID DIFFERENT OXIDATION-STATES; MICROBIAL DISSOLUTION; SOLVENT-EXTRACTION; TOXIC METALS; SEPARATION; ACTINIDES; THORIUM; WATERS AB Speciation of uranium in cultures of Clostridium sp. by X-ray absorption near-edge spectroscopy (XANES) at the National Synchrotron Light Source and by X-ray photoelectron spectroscopy (XPS) showed that U(VI) was reduced to U(IV). In addition to U(IV), a lower oxidation state of uranium, most probably U(III), was detected by XANES in the bacterial cultures. Reduction of uranium occurred only in the presence of growing or resting cells. Organic acid metabolites, the extracellular components of the culture medium, and heat-killed cells failed to reduce uranium under anaerobic conditions. The addition of uranyl acetate or uranyl nitrate (> 210 mu M U) to the culture medium retarded the growth of the bacteria as evidenced by an increase in the lag period before resumption of growth, by decreases in turbidity, and in the total production of gas and organic acid metabolites. These results show that uranium in wastes can be stabilized by the action of anaerobic bacteria. C1 SUNY STONY BROOK,DEPT MAT SCI & ENGN,STONY BROOK,NY 11794. RP FRANCIS, AJ (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. NR 31 TC 132 Z9 133 U1 2 U2 46 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD APR PY 1994 VL 28 IS 4 BP 636 EP 639 DI 10.1021/es00053a016 PG 4 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA ND550 UT WOS:A1994ND55000020 PM 22196546 ER PT J AU HUNTER, DB BERTSCH, PM AF HUNTER, DB BERTSCH, PM TI IN-SITU MEASUREMENTS OF TETRAPHENYLBORON DEGRADATION KINETICS ON CLAY MINERAL SURFACES BY IR SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID NONTRONITE; SURFACE; TRANSFORMATIONS; MONTMORILLONITE; REDUCTION; OXIDATION; SORPTION AB An attenuated total reflectance Fourier transform infrared (ATR-IR) spectroscopic method has been developed to quantitatively measure, in situ, the surface-facilitated degradation of tetraphenylboron (TPB) in fully aquated clay pastes. Two pathways for degradation of TPB could be studied both independently and simultaneously. Surface-facilitated oxidation of TPB to diphenylboric acid (DPBA) at Lewis acid sites on clay mineral surfaces was investigated on three members of the smectite family of clays. No degradation of TPB occurred on hectorite, which contains no structural Fe. TPB degraded to DPBA on montmorillonite and nontronite. A color change in nontronite indicated the production of mixed valance Fe3+-O-Fe2+ states and clearly demonstrates the reduction of structural iron during the course of the reaction. The degradation of TPB to triphenylboron (TriPB) at Bronsted acid sites could also be measured on aluminum-saturated clays either independently on hectorite or simultaneously to the Lewis acid reaction on montmorillinite by the ATR-IR method. First-order rate models are developed for both reactions and describe the data well. RP HUNTER, DB (reprint author), UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,DIV BIOGEOCHEM,DRAWER E,AIKEN,SC 29802, USA. NR 28 TC 22 Z9 22 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD APR PY 1994 VL 28 IS 4 BP 686 EP 691 DI 10.1021/es00053a024 PG 6 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA ND550 UT WOS:A1994ND55000028 PM 22196554 ER PT J AU DEGEETER, F FRANKEN, PR KNAPP, FF BOSSUYT, A AF DEGEETER, F FRANKEN, PR KNAPP, FF BOSSUYT, A TI RELATIONSHIP BETWEEN BLOOD-FLOW AND FATTY-ACID METABOLISM IN SUBACUTE MYOCARDIAL-INFARCTION - A STUDY BY MEANS OF TC-99M-SESTAMIBI AND I-123 BETA-METHYL-IODO-PHENYL PENTADECANOIC ACID SO EUROPEAN JOURNAL OF NUCLEAR MEDICINE LA English DT Article DE BETA-METHYL-IODO-PHENYL PENTADECANOIC ACID; SESTAMIBI; FATTY ACIDS; MYOCARDIAL INFARCTION ID EMISSION TOMOGRAPHY; HYPERTENSIVE RATS; PERFUSION; ANALOG; TRACER; TL-201; I-123; ACCUMULATION; DISEASE; BMIPP AB Contradictory data have been published on the relative behaviour of fatty acids and flow tracers during the subacute stage of myocardial infarction. Therefore, the present study was set up (1) to investigate the potential occurrence of mismatches between beta-methyl-iodophenyl pentadecanoic acid (BMIPP), a fatty acid analogue, and Sestamibi, and to describe their nature, and (2) to relate these mismatches to clinical characteristics such as whether or not thrombolysis or percutaneous transluminal coronary angioplasty (PTCA) had been performed. Twenty-six patients were studied within 2 weeks after myocardial infarction. Sestamibi and BMIPP single-photon emission tomography (SPET) were performed within 4 days of one another. Activity of both tracers was scored in 16 basal, 16 midventricular and 8 apical segments, using a four-point grading system: 3 = normal (greater than or equal to 65% of maximum activity), 2 = mildly decreased (45%-64%), 1 = moderately decreased (25%-44%), 0 = severely decreased (0%-24%). Coronary arteriography was obtained during the same hospital stay. Four hundred and seventy-seven segments out of 1040 studied were abnormal for at least one tracer: 197 with higher Sestamibi activity (group I), 226 with equal scores for Sestamibi and BMIPP (group II) and 54 with higher BMIPP activity (group III). Seventy-five percent of group I segments and 84% of group III segments were found in infarct-related artery territories. Group I segments were associated with acute thrombolysis and/or PTCA (P < 0.01), and with the absence of prior infarction in the territory of the infarct-related artery (P < 0.001). Group III segments were associated with the absence of thrombolysis or PTCA (P < 0.001), with occlusion of the infarct-related artery (P < 0.001), with previous infarction in the same territory (P < 0.001) and with a- or dyskinesia in this territory (P < 0.001). These data could support the interpretation that areas in which the uptake of BMIPP is more decreased than that of Sestamibi (group I) are due to delayed recovery of fatty acid metabolism after reperfusion, whereas those with higher BMIPP than Sestamibi activity (group III) are accounted for by the enhanced metabolism induced by passive systolic wall stretch. C1 FREE UNIV BRUSSELS HOSP,DEPT NUCL MED,B-1090 BRUSSELS,BELGIUM. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 24 TC 63 Z9 65 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0340-6997 J9 EUR J NUCL MED JI Eur. J. Nucl. Med. PD APR PY 1994 VL 21 IS 4 BP 283 EP 291 PG 9 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA NE907 UT WOS:A1994NE90700002 PM 8005151 ER PT J AU MILES, PC WITZE, PO AF MILES, PC WITZE, PO TI FRINGE-FIELD QUANTIFICATION IN AN LDV PROBE VOLUME BY USE OF A MAGNIFIED IMAGE SO EXPERIMENTS IN FLUIDS LA English DT Article ID LASER AB The magnified cross-section of the LDV probe volume fringe field created on a far screen (image plane) with an imaging lens is examined both analytically and experimentally. It is shown that measurements of the image plane fringe field can be used to quantitatively determine the fringe field existing within the probe volume. Because the fringe spacing in the magnified image is more accessible experimentally, both longitudinal- and lateral-coordinate variations in fringe spacing can be determined, permitting a complete mapping of the fringe field. The detailed knowledge of the fringe field thus obtained allows beam quality, alignment, and fringe uniformity to be evaluated with greater precision than is possible with other techniques. C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94550. NR 9 TC 11 Z9 11 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0723-4864 J9 EXP FLUIDS JI Exp. Fluids PD APR PY 1994 VL 16 IS 5 BP 330 EP 335 PG 6 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA NL186 UT WOS:A1994NL18600005 ER PT J AU RINGELBERG, DB TOWNSEND, GT DEWEERD, KA SUFLITA, JM WHITE, DC AF RINGELBERG, DB TOWNSEND, GT DEWEERD, KA SUFLITA, JM WHITE, DC TI DETECTION OF THE ANAEROBIC DECHLORINATING MICROORGANISM DESULFOMONILE-TIEDJEI IN ENVIRONMENTAL MATRICES BY ITS SIGNATURE LIPOPOLYSACCHARIDE BRANCHED-LONG-CHAIN HYDROXY FATTY-ACIDS SO FEMS MICROBIOLOGY ECOLOGY LA English DT Article DE ANAEROBIC DEHALOGENATION; DESULFOMONILE TIEDJEI; SULFATE-REDUCING BACTERIUM; DETECTION IN ENVIRONMENT; SIGNATURE LIPID BIOMARKER ID MICROBIAL BIOMASS; COMMUNITY STRUCTURE; LIPID-A; BACTERIA; SEDIMENTS; CONSORTIUM; ECOLOGY; WATER AB Desulfomonile tiedjei is a Gram-negative sulfate-reducing bacterium capable of catalyzing aryl reductive dehalogenation reactions. Since many toxic and persistent contaminants in the subsurface are halogenated aromatic compounds, the detection and enumeration of dehalogenating microorganisms in the environment may be a useful tool for planning and evaluating bioremediation efforts. In this study, we show that D. tiedjei contains unique lipopolysaccharide branched 3-hydroxy fatty acids, unknown as yet in other bacteria, and that it is possible to detect the bacterium in inoculated aquifer sediments based on these signature lipid biomarkers. The detection of D. tiedjei and other dehalogenating microorganisms possessing similar cellular properties in environmental matrices may be possible by this technique. Additionally, the effect of such inoculation on dehalogenation activity is examined. C1 UNIV TENNESSEE,CTR ENVIRONM BIOTECHNOL,KNOXVILLE,TN 37932. UNIV OKLAHOMA,DEPT BOT & MICROBIOL,NORMAN,OK 73019. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. NR 24 TC 46 Z9 46 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-6496 J9 FEMS MICROBIOL ECOL JI FEMS Microbiol. Ecol. PD APR PY 1994 VL 14 IS 1 BP 9 EP 18 DI 10.1016/0168-6496(94)90076-0 PG 10 WC Microbiology SC Microbiology GA NH508 UT WOS:A1994NH50800002 ER PT J AU OVERHOLT, BF PANJEHPOUR, M VODINH, T FARRIS, C SCHMIDHAMMER, JL SNEED, RE BUCKLEY, PF AF OVERHOLT, BF PANJEHPOUR, M VODINH, T FARRIS, C SCHMIDHAMMER, JL SNEED, RE BUCKLEY, PF TI SPECTROSCOPIC DIAGNOSIS OF ESOPHAGEAL CANCER - IMPROVED TECHNIQUE SO GASTROENTEROLOGY LA English DT Meeting Abstract C1 THOMPSON CANC SURVIVAL CTR,CTR LASER,KNOXVILLE,TN. OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. UNIV TENNESSEE,DEPT STAT,KNOXVILLE,TN 37996. NR 0 TC 1 Z9 1 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0016-5085 J9 GASTROENTEROLOGY JI Gastroenterology PD APR PY 1994 VL 106 IS 4 SU S BP A425 EP A425 PG 1 WC Gastroenterology & Hepatology SC Gastroenterology & Hepatology GA NH909 UT WOS:A1994NH90901687 ER PT J AU KAISER, UB DUSHKIN, H ALTHERR, MR BEIER, DR CHIN, WW AF KAISER, UB DUSHKIN, H ALTHERR, MR BEIER, DR CHIN, WW TI CHROMOSOMAL LOCALIZATION OF THE GONADOTROPIN-RELEASING-HORMONE RECEPTOR GENE TO HUMAN-CHROMOSOME 4Q13.1-Q21.1 AND MOUSE CHROMOSOME-5 SO GENOMICS LA English DT Note ID RECOMBINANT INBRED STRAINS; MOLECULAR-CLONING; GNRH RECEPTOR; BETA-SUBUNIT; SHORT ARM; EXPRESSION; ASSIGNMENT; SEQUENCE; MICE AB The gonadotropin-releasing hormone receptor (GRHR) is a G-protein-coupled receptor on the cell surface of pituitary gonadotropes, where it serves to transduce signals from the extracellular ligand, the hypothalamic factor gonadotropin-releasing hormone, and to modulate the synthesis and secretion of luteinizing hormone and follicle-stimulating hormone. We have localized the GRHR gene to the q13.1-q21.1 region of the human chromosome 4 using mapping panels of human/redent somatic cell hybrids containing different human chromosomes or different regions of human chromosome 4. Furthermore, using linkage analysis of single-strand conformational polymorphisms, the murine GRHR gene was localized to mouse chromosome 5, linked to the endogenous retroviral marker Pmv-11. This is consistent with the evolutionary conservation of homology between these two regions, as has been previously suggested from comparative mapping of several other loci. The localization of the GRHR gene may be useful in the study of disorders of reproduction. (C) 1994 Academic Press, Inc. C1 HOWARD HUGHES MED INST,BOSTON,MA 02115. HARVARD UNIV,SCH MED,BOSTON,MA 02115. LOS ALAMOS NATL LAB,GENOM & STRUCT BIOL GRP,LOS ALAMOS,NM 87545. RP KAISER, UB (reprint author), BRIGHAM & WOMENS HOSP,DEPT MED,DIV GENET,GW THORN BLDG,ROOM 909,20 SHATTUCK ST,BOSTON,MA 02115, USA. FU NICHD NIH HHS [HD19938] NR 22 TC 26 Z9 26 U1 0 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD APR PY 1994 VL 20 IS 3 BP 506 EP 508 DI 10.1006/geno.1994.1211 PG 3 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA NF578 UT WOS:A1994NF57800026 PM 8034328 ER PT J AU DAVISSON, ML PRESSER, TS CRISS, RE AF DAVISSON, ML PRESSER, TS CRISS, RE TI GEOCHEMISTRY OF TECTONICALLY EXPELLED FLUIDS FROM THE NORTHERN COAST RANGES, RUMSEY-HILLS, CALIFORNIA, USA SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID GREAT VALLEY SEQUENCE; SOUTHWESTERN SACRAMENTO VALLEY; SALINE FORMATION WATERS; ANDREAS FAULT SYSTEM; GULF-COAST; ACCRETIONARY PRISM; SEDIMENTARY BASIN; FRIO FORMATION; ARC BASIN; CALIFORNIA AB Tectonic compression has created abnormally high pressure on deep basinal fluids causing their expulsion from areally exposed Upper Cretaceous rock along the eastern margin of the California Coast ranges. The fluids emerge as near-neutral, perennial sodium chloride springs at high elevations with flow rates as high as 10 L per min. Higher spring discharges are more common around the exposure of a west-vergent fault propagation fold axis. Spring waters range from approximately 1000 to 27,000 mg/L TDS. The least saline water (delta O-18 = -7.5parts per thousand) closely represents local meteoric water that mixes with saline fluid (delta O-18 = + 5.3parts per thousand) and forms a slope of approximately 3.5 on a deltaD vs. delta O-18 plot. A Na (125 to 8000 mg/L) vs. Cl (150 to 17,000 mg/L) plot shows a linear dilution trend that extends close to, but below, the values for modern seawater. Calcium (75-3000 mg/L) is considerably enriched relative to seawater and forms a nonlinear trend with chloride. In detail, the ''Na deficit,'' defined by the difference between the measured Na content and the Na concentration on a hypothetical seawater dilution line, is approximately balanced by the Ca excess, similarly defined by the seawater dilution line. This relationship strongly suggests that the fluid is diluted seawater that is being modified by active albitization of plagioclase at different depths. Simultaneous B and O-18 enrichment of the fluids, accompanied by deuterium depletion, further suggest that the seawater modification is influenced by clay diagenesis. Bicarbonate and SiO2 concentrations show an inverse correlation with Cl, with most waters being saturated or slightly oversaturated with calcite and quartz at the discharge temperatures. Some freshwater springs with near-meteoric stable isotope values may represent mixing of young groundwater from perched aquifers, but in many cases, the freshwater springs emerge along the same structures and have the same perennial nature as the saline fluids, and expulsion of an older fresh groundwater component that is under abnormal fluid pressures cannot be ruled out. Basinal fluids elsewhere commonly show dilution trends with local meteoric water, and in the case of the Rumsey Hills, some of the dilute saline waters may indicate deep penetration of meteoric water (> 1 km) in the Pleistocene before the latest tectonic uplift. Geothermometry of the spring waters (maximum approximately 90-degrees-C) suggest an origin from as deep as 4.0 km. This depth is consistent with the depth of the core of a fault propagation anticline below the surface of the Rumsey Hills developed by active internal deformation of an east-tapering wedge beneath the south-western Sacramento Valley. Active tectonic compression causes near-lithostatic fluid pressures in the shallow subsurface below the Rumsey Hills and volume strain within the core of the anticline that results in upward expulsion of the saline fluids from the indicated depths. C1 US GEOL SURVEY,MENLO PK,CA 94025. UNIV CALIF DAVIS,DEPT GEOL,DAVIS,CA 95616. RP DAVISSON, ML (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV NUCL CHEM,POB 808,L-237,LIVERMORE,CA 94550, USA. NR 69 TC 47 Z9 54 U1 1 U2 9 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD APR PY 1994 VL 58 IS 7 BP 1687 EP 1699 DI 10.1016/0016-7037(94)90530-4 PG 13 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NF222 UT WOS:A1994NF22200001 ER PT J AU BRADY, PV CARROLL, SA AF BRADY, PV CARROLL, SA TI DIRECT EFFECTS OF CO2 AND TEMPERATURE ON SILICATE WEATHERING - POSSIBLE IMPLICATIONS FOR CLIMATE CONTROL SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Letter ID ATMOSPHERIC CO2; DISSOLUTION KINETICS; GEOCHEMICAL CYCLE; LIFE-SPAN; RATES; TIME; 25-DEGREES-C; DEPENDENCE; BIOSPHERE; MECHANISM AB A critical uncertainty in models of the global carbon cycle and climate is the combined effect of organic activity, temperature, and atmospheric CO2 on silicate weathering. Here we present new dissolution rates of anorthite and augite which indicate that silicate weathering in organic-rich solutions is not directly affected by soil CO2 but is very sensitive to temperature. Apparently CO2 accelerates silicate weathering indirectly by fertilizing organic activity and the production of corrosive organic acids. The weathering dependencies highlight the ability of silicate weathering to act as a global thermostat and damp out climate change, when used as input in steady-state carbon cycle and climate models. C1 LAWRENCE LIVERMORE NATL LAB,DIV EARTH SCI,LIVERMORE,CA 94550. RP BRADY, PV (reprint author), SANDIA NATL LABS,GEOCHEM RES,ALBUQUERQUE,NM 87185, USA. NR 32 TC 139 Z9 150 U1 4 U2 26 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD APR PY 1994 VL 58 IS 7 BP 1853 EP 1856 DI 10.1016/0016-7037(94)90543-6 PG 4 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NF222 UT WOS:A1994NF22200014 ER PT J AU ELLISON, AJG HESS, PC AF ELLISON, AJG HESS, PC TI RAMAN-STUDY OF POTASSIUM SILICATE-GLASSES CONTAINING RB+, SR2+, Y3+, AND ZR4+ - IMPLICATIONS FOR CATION SOLUTION MECHANISMS IN MULTICOMPONENT LIQUIDS SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID ALKALI GERMANOSILICATE GLASSES; VIBRATIONAL-SPECTRA; REDOX EQUILIBRIA; STRUCTURAL UNITS; MELT SYSTEMS; SI-29 NMR; SODIUM; IRON; COORDINATION; ENVIRONMENTS AB The parallel- and perpendicular-polarized Raman spectra of (1 - x)K2O.xM(z+)2/zO.4SiO23 glasses are presented, where M is one of the Period V cations Rb+, Sr2+, Y3+ or Zr4+. These compositions represent the equal-oxygen substitution of a Period V cation for K+, which preserves the ratio of non-bridging oxygen (NBO) to Si atoms but not, in general, the ratio of all oxygen to all cations. Rb+ and K+ occupy very similar sites and appear to share the same NBO with virtually no energetic penalty. As the valence of the Period V cation increases, so does the tendency of the cation to form silicate species that am depolymerized relative to the species dominating the structure of the bulk glass. The tendency to form regions comparatively rich in Si-O-Si bonds increases in the same sense. The dominant silicate species are those with 0 or 1 NBO in all glasses. The spectra indicate that K+ shares NBO with Rb+ or Sr2+, that there is relatively little sharing of NBO by K+ and Y3+, and that K+ and Zr4+ share the same NBO in what appears to be a nearly fixed bulk stoichiometric K:Zr ratio of 2:1. The latter provides a mechanism for the substantial increase in ZrO2 solubility seen in peralkaline liquids. A novel means of expressing homogeneous equilibria in silicate liquids is presented, whereby it is possible to make concrete predictions about the coordination numbers of cations in silicate liquids and to predict how they might be affected by the presence of other cations. C1 BROWN UNIV, DEPT GEOL SCI, PROVIDENCE, RI 02912 USA. RP ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. NR 38 TC 24 Z9 24 U1 0 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0016-7037 EI 1872-9533 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD APR PY 1994 VL 58 IS 8 BP 1877 EP 1887 DI 10.1016/0016-7037(94)90421-9 PG 11 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NJ318 UT WOS:A1994NJ31800002 ER PT J AU BORG, SG DEPAOLO, DJ AF BORG, SG DEPAOLO, DJ TI LAURENTIA, AUSTRALIA, AND ANTARCTICA AS A LATE PROTEROZOIC SUPERCONTINENT - CONSTRAINTS FROM ISOTOPIC MAPPING SO GEOLOGY LA English DT Article ID NORTHERN VICTORIA LAND; UNITED-STATES; TRANSANTARCTIC MOUNTAINS; CONTINENTAL-MARGIN; WOPMAY OROGEN; AMERICA; AGE; CONNECTION; SUPERGROUP; NEODYMIUM AB The reconstruction of Laurentia, Australia, and Antarctica into a Proterozoic supercontinent is evaluated by analyzing the fit of Precambrian provinces defined by isotopic and geochronologic mapping. The analysis is complicated by allochthonous segments of the Antarctic and eastern Australian margins. Removal of the allochthonous provinces produces a closer fit of the continents; there is a match of Early Proterozoic basement between southwestern Laurentia and the only exposure of craton known from the paleo-Pacific margin of Antarctica. In addition, western Laurentia is brought closer to the Australian Gawler block, consistent with provenance interpretations of the Belt Supergroup. Removal of the allochthonous provinces by right-lateral translation relative to the Antarctic craton margin places them in a pre-750 Ma position where they could be southwestward extensions of the Yavapai-Mazatzal and Grenville provinces of southern Laurentia. This modified reconstruction leads to a prediction of extensive Archean basement in Antarctica between the South Pole and Victoria Land, a prediction partly borne out by Archean rocks in the Miller Range of the Transantarctic Mountains; it also predicts the presence of 1.4 Ga rapakivi granites in the Transantarctic Mountains basement. This configuration implies assembly of the Australian-Antarctica Gondwana margin by terrane accretion following, or accompanied by, left-lateral translation. This is compatible with a tectonic regime of clockwise rotation of Laurentia relative to Australia and Antarctica after rifting. Thus, the proposed supercontinent, with some modifications, has potential for explaining several aspects of the pattern of Precambrian provinces in the three continents. C1 UNIV CALIF BERKELEY,BERKELEY CTR ISOTOPE GEOCHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720. NR 28 TC 138 Z9 139 U1 1 U2 11 PU GEOLOGICAL SOC AMERICA PI BOULDER PA PO BOX 9140 3300 PENROSE PLACE, BOULDER, CO 80301 SN 0091-7613 J9 GEOLOGY JI Geology PD APR PY 1994 VL 22 IS 4 BP 307 EP 310 DI 10.1130/0091-7613(1994)022<0307:LAAAAA>2.3.CO;2 PG 4 WC Geology SC Geology GA NE800 UT WOS:A1994NE80000005 ER PT J AU KERRICK, D CALDEIRA, K AF KERRICK, D CALDEIRA, K TI POST-125 MA CARBON STORAGE ASSOCIATED WITH CONTINENT-CONTINENT COLLISION - COMMENT SO GEOLOGY LA English DT Note ID SUBDUCTION C1 LAWRENCE LIVERMORE NATL LAB,DIV GLOBAL CLIMATE RES,LIVERMORE,CA 94550. RP KERRICK, D (reprint author), PENN STATE UNIV,DEPT GEOSCI,UNIVERSITY PK,PA 16802, USA. RI Caldeira, Ken/E-7914-2011 NR 14 TC 4 Z9 4 U1 0 U2 0 PU GEOLOGICAL SOC AMERICA PI BOULDER PA PO BOX 9140 3300 PENROSE PLACE, BOULDER, CO 80301 SN 0091-7613 J9 GEOLOGY JI Geology PD APR PY 1994 VL 22 IS 4 BP 381 EP 382 DI 10.1130/0091-7613(1994)022<0381:PMCSAW>2.3.CO;2 PG 2 WC Geology SC Geology GA NE800 UT WOS:A1994NE80000025 ER PT J AU KOIKE, M JONES, NB MATTHEWS, WA JOHNSTON, PV MCKENZIE, RL KINNISON, D RODRIGUEZ, J AF KOIKE, M JONES, NB MATTHEWS, WA JOHNSTON, PV MCKENZIE, RL KINNISON, D RODRIGUEZ, J TI IMPACT OF PINATUBO AEROSOLS ON THE PARTITIONING BETWEEN NO2 AND HNO3 SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID HETEROGENEOUS CHEMISTRY; STRATOSPHERIC OZONE; SULFATE AEROSOLS; DEPLETION; ERUPTION AB Ground based infrared observations of HNO3 column amount at Lauder, New Zealand (45-degrees-S, 170-degrees-E), show significant increases in HNO3 following the arrival of Pinatubo volcanic aerosols. The increase first became apparent in September 1991 when the HNO3 amount was higher than that expected from the regular seasonal variation by 2.3 x 10(15) cm-2, which corresponds to 16 % of the unperturbed value. Between September 1991 and May 1993, the observed HNO3 amounts were systematically higher, typically by 1.5 to 3.5 x 10(15) cm-2 or 10 to 30 %. After June 1993, the observed HNO3 amounts were close to the unperturbed values. The decrease in stratospheric NO2 due to the volcanic aerosols was observed at Lauder after August 1991 [Johnston et al., 1992, 1993]. The start of the HNO3 increase and the general trend are in agreement with those expected from the NO2 decrease when heterogeneous reactions on the sulfate aerosols are considered. Model calculations, in which observed aerosol fields have been used, qualitatively agree with these observed trends, although the magnitude of the changes have been underestimated. These results provide further understanding of the impact of heterogeneous chemistry on the partitioning between NO2 and HNO3. C1 NATL INST WATER & ATMOSPHER RES,CENT OTAGO,NEW ZEALAND. ATMOSPHER & ENVIRONM RES INC,CAMBRIDGE,MA 02139. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP KOIKE, M (reprint author), NAGOYA UNIV,SOLAR TERR ENVIRON LAB,TOYOKAW,AICHI,JAPAN. RI Koike, Makoto/F-4366-2011; Jones, Nicholas/G-5575-2011 OI Jones, Nicholas/0000-0002-0111-2368 NR 21 TC 69 Z9 71 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD APR 1 PY 1994 VL 21 IS 7 BP 597 EP 600 DI 10.1029/94GL00303 PG 4 WC Geosciences, Multidisciplinary SC Geology GA NE512 UT WOS:A1994NE51200023 ER PT J AU NEWMAN, GA AF NEWMAN, GA TI A STUDY OF DOWNHOLE ELECTROMAGNETIC SOURCES FOR MAPPING ENHANCED OIL-RECOVERY PROCESSES SO GEOPHYSICS LA English DT Article AB An evaluation of downhole electromagnetic (EM) sources has been made for mapping 3-D enhanced oil recovery (EOR) processes. Two types of sources considered were vertical magnetic dipoles and vertical to near-vertical electric dipoles and bipoles. These sources were used to produce magnetic field responses expected of EOR processes for crosswell configurations. A borehole-to-surface configuration was also studied for the downhole electric source, since this configuration can be highly sensitive to shallow 3-D EOR targets. For the crosswell arrays, the criteria used to evaluate the sources were the magnitudes of the observed signals with and without the process and the amount these signals change because of a migrating process. Instrumental noise was considered in the evaluation. Findings show that either electric or magnetic sources can produce truly significant changes in the fields, provided the fields before and after the initiation of the process are compared. An order of magnitude change in the fields has been demonstrated. The key to measuring such changes is to use the highest frequency possible. This frequency will be limited by instrumental noise. A migrating process did not produce field changes that are as large as those observed with and without the process. Nevertheless, model simulations showed that changes in the fields caused by the migrating processes are significant and measurable. Calculated responses of a shallow process at the surface showed that they were extremely sensitive to small deviations in the orientation of the downhole electric source. Quantitative interpretation should proceed only with techniques that explicitly consider the source orientation. RP NEWMAN, GA (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. RI Newman, Gregory/G-2813-2015 NR 15 TC 5 Z9 5 U1 0 U2 2 PU SOC EXPLORATION GEOPHYSICISTS PI TULSA PA 8801 S YALE ST, TULSA, OK 74137 SN 0016-8033 J9 GEOPHYSICS JI Geophysics PD APR PY 1994 VL 59 IS 4 BP 534 EP 545 DI 10.1190/1.1443614 PG 12 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NE475 UT WOS:A1994NE47500003 ER PT J AU ZUCCA, JJ HUTCHINGS, LJ KASAMEYER, PW AF ZUCCA, JJ HUTCHINGS, LJ KASAMEYER, PW TI SEISMIC VELOCITY AND ATTENUATION STRUCTURE OF THE GEYSERS GEOTHERMAL-FIELD, CALIFORNIA SO GEOTHERMICS LA English DT Article DE THE GEYSERS GEOTHERMAL FIELD; SEISMIC WAVE VELOCITY; RESERVOIR ID WAVE VELOCITY; CASCADE RANGE; P-WAVE; EARTHQUAKE; INVERSION; VOLCANO; TOMOGRAPHY; STEAM AB The Geysers geothermal field is located in northern California and is one of the world's largest producers of electricity from geothermal energy. A key resource management issue at this field is the distribution of fluid in the matrix of the reservoir rock. In this paper, we interpret seismic compressional-wave velocity and quality quotient (Q) data at The Geysers in terms of the geologic structure and fluid saturation in the reservoir. Our data consist of waveforms from approximately 300 earthquakes. Using compressional-wave arrival times, we invert for earthquake location, origin time, and velocity within a three-dimensional grid. Using the pulse width of the compressional wave, we invert for the pulse width contribution associated with the source and the one-dimensional Q structure. We find that the velocity structure correlates with known mapped geologic units. The dry steam reservoir, which is known from steam well drilling, is mostly correlated with low velocity. The correlation is best for those areas where the steam pressure has been reduced by production. The Q increases with depth to the top of the dry steam reservoir and decreases with depth within the reservoir. This decrease of Q with depth suggests that the liquid saturation of the reservoir rock matrix increases with depth. RP ZUCCA, JJ (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 33 TC 32 Z9 34 U1 1 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0375-6505 J9 GEOTHERMICS JI Geothermics PD APR PY 1994 VL 23 IS 2 BP 111 EP 126 DI 10.1016/0375-6505(94)90033-7 PG 16 WC Energy & Fuels; Geosciences, Multidisciplinary SC Energy & Fuels; Geology GA PD736 UT WOS:A1994PD73600002 ER PT J AU ANTUNEZ, EU BODVARSSON, GS WALTERS, MA AF ANTUNEZ, EU BODVARSSON, GS WALTERS, MA TI NUMERICAL-SIMULATION STUDY OF THE NORTHWEST GEYSERS GEOTHERMAL-FIELD, A CASE-STUDY OF THE COLDWATER CREEK STEAMFIELD SO GEOTHERMICS LA English DT Article DE THE GEYSERS GEOTHERMAL FIELD; GEOTHERMAL RESERVOIR; NUMERICAL SIMULATION ID CALIFORNIA; FLUID; AREA AB Commercial exploitation of the Northwest Geysers began in early 1988. To date, little has been published about the connectivity of this area to the rest of the geothermal field, the interaction between the so-called ''typical'' reservoir and the underlying high-temperature zone, or the combined potential of both producing horizons. To investigate these issues, a dual-porosity numerical model of The Geysers geothermal system with special emphasis to the NW Geysers was developed. The model was calibrated using production data from 1957 to early 1991. Simulation results and the measured data suggest that: the typical reservoir in NW Geysers is connected to the rest of the field; significant migration of fluids from this part of the reservoir to the rest of The Geysers has occurred; and there still are some undeveloped areas in the NW Geysers with production potential. The production/injection scenarios analyzed with the model suggest that the existing wells are not sufficient to sustain a 60 MWe operation for 30 years starting in 1991, However, the addition of new wells within the licensed boundaries of the Coldwater Creek steamfield, drilled over a period of years, could sustain the steam production required to generate 60 MWe for 30 years. A 130 MWe development is not feasible within the mid-1993 licensed boundaries. C1 RUSSIAN RIVER ENERGY CO,SANTA ROSA,CA 95401. RP ANTUNEZ, EU (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. OI Walters, Mark/0000-0001-8458-4813 NR 31 TC 2 Z9 2 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0375-6505 J9 GEOTHERMICS JI Geothermics PD APR PY 1994 VL 23 IS 2 BP 127 EP 141 DI 10.1016/0375-6505(94)90034-5 PG 15 WC Energy & Fuels; Geosciences, Multidisciplinary SC Energy & Fuels; Geology GA PD736 UT WOS:A1994PD73600003 ER PT J AU FRIDLEIFSSON, IB FREESTON, DH AF FRIDLEIFSSON, IB FREESTON, DH TI GEOTHERMAL-ENERGY RESEARCH-AND-DEVELOPMENT SO GEOTHERMICS LA English DT Article DE GEOTHERMAL RESOURCES; GEOTHERMAL UTILIZATION; GEOTHERMAL DEVELOPMENT; GEOTHERMAL INVESTMENTS AB Thermal springs have been used for bathing, washing and cooking for thousands of years in many countries. At the beginning of this century, experiments started with piping the hot water to houses for space heating and with using geothermal steam for the production of electricity. Geothermal is a proven energy resource that uses mostly conventional technology. Commercial production on the scale of hundreds of MW has been undertaken for over three decades both for electricity generation and direct utilization. Today, electricity is generated from geothermal energy in 21 countries. The installed capacity is nearly 6300 MW-electric. Four developing countries (El Salvador 18%, Kenya 11%, Nicaragua 18% and Philippines 21%) produce over 10% of their total electricity from geothermal. Electric generation cost is commonly around 4 U.S.cents/kWh. Direct utilization of geothermal water (space heating, horticulture, fish farming, industry and/or bathing) is known in about 40 countries, thereof 14 countries have each an installed capacity of over 100 MW-thermal. The overall installed capacity for direct utilization is about 11,400 MW-thermal. The production cost/kWh for direct utilization is highly variable, but commonly under 2 U.S.cents/kWh(t). A worldwide survey shows that the total investments in geothermal energy between 1973 and 1992 amounted to approximately 22 billion U.S.$. During the two decades, 30 countries invested each over 20 million U.S.$, 12 countries over 200 million U.S.$, and 5 countries over 1 billion U.S.$. During the first decade, 1973-1982, public funding amounted to 4.6 billion U.S.$ and private funding to 3 billion U.S.$. During the second decade, 1983-1992, public funding amounted to 6.6 billion U.S.$ and private funding to 7.7 billion U.S.$. Geothermal development has in the past been much affected by the development of prices of the competing fuels, especially oil and natural gas. Assuming a continuation of the present oil prices, the annual growth rate in geothermal utilization is likely to be some 4% for electricity generation and 10% for direct utilization. This would imply installed capacities of 8900 MW(e) and 30,000 MW(t) in the year 2000. The total investment cost of geothermal in the world during the next decade can be expected to be some 15-20 billion U.S.$. Properly implemented, geothermal energy is a sustainable resource and benign to the environment. The emission of greenhouse gases is minimal compared to fossil fuels. The removal of hydrogen sulphide from high temperature steam and the reinjection of spent geothermal fluids into the ground make the potential negative environmental effects negligible. The relative economic viability of geothermal energy will improve significantly if and when a pollution tax is endorsed on power production using fossil fuels. Geothermal exploration and exploitation requires skills from many scientific and engineering disciplines. International geothermal training centres are operated in Iceland, Italy, Japan, Mexico, and New Zealand. The International Geothermal Association was founded in 1988 and has over 2000 members in all parts of the world. C1 UNIV AUCKLAND,INST GEOTHERMAL,AUCKLAND,NEW ZEALAND. LAWRENCE BERKELEY LAB,IGA SECRETARIAT,BOARD DIRECTORS ASSOC,BERKELEY,CA 94720. RP FRIDLEIFSSON, IB (reprint author), UN UNIV,GEOTHERMAL TRAINING PROGRAME,ORKUSTOFNUN GRENSASVEGUR 9,IS-108 REYKJAVIK,ICELAND. NR 80 TC 12 Z9 12 U1 5 U2 47 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0375-6505 J9 GEOTHERMICS JI Geothermics PD APR PY 1994 VL 23 IS 2 BP 175 EP 214 DI 10.1016/0375-6505(94)90037-X PG 40 WC Energy & Fuels; Geosciences, Multidisciplinary SC Energy & Fuels; Geology GA PD736 UT WOS:A1994PD73600006 ER PT J AU HICKMAN, DP KRUCHTEN, DA FISHER, SK ANDERSON, AL AF HICKMAN, DP KRUCHTEN, DA FISHER, SK ANDERSON, AL TI CALIBRATION OF A AM-241 WOUND-MONITORING SYSTEM USING MONTE-CARLO TECHNIQUES SO HEALTH PHYSICS LA English DT Article DE BIOASSAY; CALIBRATION; PHANTOM; MONTE-CARLO AB Monte Carlo techniques have been used to establish calibration factors and to predict gamma spectra for well-defined measurements. These techniques are routinely used to predict shielding requirements and criticality specifications. The Lawrence Livermore National Laboratory is researching the feasibility of using Monte Carlo techniques to establish calibration factors for in vivo measurement systems. A pilot study was conducted to demonstrate the use of the Monte Carlo technique to calibrate in vivo measurement systems, to predict the efficiency of a wound measurement system and compare the predicted efficiency with the measured efficiency, and to investigate the effects of the source geometry and the detector size on the measured efficiency. Results of this study demonstrate good agreement between the Monte-Carlo-predicted efficiency and the measured efficiency for a wound calibration phantom. The effects of the source geometry and the detector size tend to conform to the physical processes that govern the measurement process. These results demonstrate that the Monte Carlo technique accurately predicts the in vivo measurement efficiency if the characteristics of the attenuating material and the Monte Carlo source geometry are properly established. RP HICKMAN, DP (reprint author), LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD APR PY 1994 VL 66 IS 4 BP 400 EP 406 DI 10.1097/00004032-199404000-00004 PG 7 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA NC101 UT WOS:A1994NC10100005 PM 8138405 ER PT J AU WHITE, CM DISANZO, F AF WHITE, CM DISANZO, F TI CHROMATOGRAPHIC METHODS IN THE ANALYSIS OF FOSSIL AND SYNTHETIC FUELS SO HRC-JOURNAL OF HIGH RESOLUTION CHROMATOGRAPHY LA English DT Editorial Material C1 MOBIL RES & DEV CORP,PAULSBORO,NJ 08066. RP WHITE, CM (reprint author), PITTSBURGH ENERGY TECHNOL CTR,PITTSBURGH,PA, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU DR ALFRED HUTHIG VERLAG GMBH PI HEIDELBERG 1 PA POSTFACH 102869, W-69018 HEIDELBERG 1, GERMANY SN 0935-6304 J9 HRC-J HIGH RES CHROM JI HRC-J. High Resolut. Chromatogr. PD APR PY 1994 VL 17 IS 4 BP 193 EP 193 PG 1 WC Chemistry, Analytical SC Chemistry GA NL848 UT WOS:A1994NL84800001 ER PT J AU ANDERSON, RR WHITE, CM AF ANDERSON, RR WHITE, CM TI ANALYSIS OF FISCHER-TROPSCH BY-PRODUCT WATERS BY GAS-CHROMATOGRAPHY SO HRC-JOURNAL OF HIGH RESOLUTION CHROMATOGRAPHY LA English DT Article DE FISCHER-TROPSCH WATERS; ALCOHOLS IN WATER; CARBOXYLIC ACIDS IN WATER; ALDEHYDES IN WATER; KETONES IN WATER AB This paper describes a quantitative technique for the determination of organic constituents in Fischer-Tropsch by-product waters. Temperature-programmed gas chromatography on derivatized bonded polar capillary columns provides the required separation that permits reliable quantitation of individual compounds. A preliminary combined gas chromatographic-mass spectrometric survey to identify the components present in Fischer-Tropsch by-product waters is presented. The elution order of 58 identified components is tabulated. Components identified in a typical Fischer-Tropsch by-product water include C-1-C-9 linear and branched alcohols, C-3-C-8 ketones, C-2-C-6 carboxylic acids, and C-2-C-4 linear aldehydes. RP ANDERSON, RR (reprint author), PITTSBURGH ENERGY TECHNOL CTR,POB 10940,PITTSBURGH,PA 15236, USA. NR 10 TC 6 Z9 6 U1 5 U2 7 PU DR ALFRED HUTHIG VERLAG GMBH PI HEIDELBERG 1 PA POSTFACH 102869, W-69018 HEIDELBERG 1, GERMANY SN 0935-6304 J9 HRC-J HIGH RES CHROM JI HRC-J. High Resolut. Chromatogr. PD APR PY 1994 VL 17 IS 4 BP 245 EP 250 PG 6 WC Chemistry, Analytical SC Chemistry GA NL848 UT WOS:A1994NL84800009 ER PT J AU WEIDNER, N MOORE, DH VARTANIAN, R AF WEIDNER, N MOORE, DH VARTANIAN, R TI CORRELATION OF KI-67 ANTIGEN EXPRESSION WITH MITOTIC FIGURE INDEX AND TUMOR GRADE IN BREAST CARCINOMAS USING THE NOVEL PARAFFIN-REACTIVE MIB1 ANTIBODY SO HUMAN PATHOLOGY LA English DT Article DE BREAST CARCINOMA; DNA SYNTHESIS; PROLIFERATION MARKERS; KI-67 ANTIGEN; MITOTIC FIGURES; PROGNOSIS; SURVIVAL ID LYMPH-NODE STATUS; CELL-PROLIFERATION; CANCER; BROMODEOXYURIDINE; REPRODUCIBILITY; PROGNOSIS; KINETICS; SECTIONS; GROWTH; PARTS C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA. RP WEIDNER, N (reprint author), UNIV CALIF SAN FRANCISCO,DEPT PATHOL,BOX 0102,SAN FRANCISCO,CA 94143, USA. NR 32 TC 151 Z9 152 U1 0 U2 2 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0046-8177 J9 HUM PATHOL JI Hum. Pathol. PD APR PY 1994 VL 25 IS 4 BP 337 EP 342 DI 10.1016/0046-8177(94)90140-6 PG 6 WC Pathology SC Pathology GA NL056 UT WOS:A1994NL05600003 PM 8163266 ER PT J AU BILDSTEIN, KL GAWLIK, DE FERRAL, DP BRISBIN, IL WEIN, GR AF BILDSTEIN, KL GAWLIK, DE FERRAL, DP BRISBIN, IL WEIN, GR TI WADING BIRD USE OF ESTABLISHED AND NEWLY CREATED REACTOR COOLING RESERVOIRS AT THE SAVANNA-RIVER SITE, NEAR AIKEN, SOUTH-CAROLINA, USA SO HYDROBIOLOGIA LA English DT Article DE WADING BIRDS; CICONIIFORMES; RESERVOIRS; LACUSTRINE VEGETATION; WETLAND VEGETATION; MACROPHYTES; STANDING DEAD TIMBER; FISHES; PREDATOR-PREY INTERACTIONS AB We compared wading bird use of a newly created 405-ha reactor cooling reservoir (L-Lake) at the Savannah River Site, near Aiken, South Carolina, with that of two similar > 25-year-old reservoirs (1130-ha Par Pond and 87-ha Pond B) at the same site. L-Lake was constructed in 1984-1985 and filled in late 1985. Approximately 25% of the shoreline of L-Lake was planted with lacustrine vegetation in early 1987 in an attempt to speed the establishment of a self-sustaining balanced biological community (BBC) at the reservoir. Even so, during the course of our studies, L-Lake had considerably less wetland vegetation, especially floating-leaved species such as yellow nelumbo (Nelumbo lutea), than did either of the two older reservoirs. Sixty-three surveys of the avian communities using the three reservoirs were conducted between fall of 1987 and summer of 1989. These surveys indicated that (1) at least seven species of wading birds (order: Ciconiiformes) used L-Lake, (2) wading bird density was higher at L-Lake than at the other two reservoirs, (3) wading birds represented a higher proportion of the total avian community at L-Lake than at the other two, older reservoirs, and (4) wading birds at L-Lake used planted portions of the shore-line more than unplanted portions. We suggest that the inter-reservoir differences we observed represent a 'trophic upsurge' (sensu O'Brien, 1990) resulting from the increased availability of fishes at L-Lake compared with the two older reservoirs. C1 SAVANNAH RIVER ECOL LAB, AIKEN, SC 29802 USA. WINTHROP COLL, DEPT BIOL, ROCK HILL, SC 29733 USA. MEMPHIS STATE UNIV, DEPT BIOL, MEMPHIS, TN 38152 USA. NR 34 TC 3 Z9 3 U1 0 U2 2 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0018-8158 J9 HYDROBIOLOGIA JI Hydrobiologia PD APR 1 PY 1994 VL 279 BP 71 EP 82 DI 10.1007/BF00027842 PG 12 WC Marine & Freshwater Biology SC Marine & Freshwater Biology GA NK399 UT WOS:A1994NK39900008 ER PT J AU HOFMANN, M KOCH, M HEINRICH, HJ WEISER, G FELDMANN, J ELSASSER, W GOBEL, EO CHOW, WW KOCH, SW AF HOFMANN, M KOCH, M HEINRICH, HJ WEISER, G FELDMANN, J ELSASSER, W GOBEL, EO CHOW, WW KOCH, SW TI TEMPORAL AND SPECTRAL GAIN DYNAMICS IN AN ACTIVELY MODELOCKED SEMICONDUCTOR-LASER SO IEE PROCEEDINGS-OPTOELECTRONICS LA English DT Article; Proceedings Paper CT Semiconductor and Integrated Optoelectronics Conference (SIOE 93) CY MAR 29-31, 1993 CL UNIV WALES, COLL CARDIFF, CARDIFF, WALES HO UNIV WALES, COLL CARDIFF DE MODELOCKING; SEMICONDUCTOR LASERS ID QUANTUM-WELL LASER; MODE-LOCKING; DIODE-LASER; GENERATION; PULSES AB We apply a new electrical pump, optical probe spectroscopic technique using a fs Ti : sapphire laser to study the temporal and spectral gain dynamics of a modelocked external cavity semiconductor laser. The temporal behaviour of the gain and the spectrum of the differential gain are directly obtained. The spectrum of the differential refractive index is determined via a Kramers-Kronig transformation enabling us to determine the wavelength dependence of the alpha parameter. From the discussion of these results, strategies, limits and solutions are proposed to improve the quality of modelocking of diode lasers consequently resulting in pulse shortening. The proposals are experimentally verified for wavelength-detuned operation and for synchronous pumping with ultrashort optical pulses instead of electrical modulation. C1 UNIV ARIZONA,CTR OPT SCI,TUCSON,AZ 85721. UNIV ARIZONA,DEPT PHYS,TUCSON,AZ 85721. UNIV MARBURG,ZENTRUM MAT WISSENSCH,D-35032 MARBURG,GERMANY. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP HOFMANN, M (reprint author), PHILIPPS UNIV MARBURG,FACHBEREICH PHYS,RENTHOF 5,D-35032 MARBURG,GERMANY. NR 23 TC 8 Z9 8 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 1350-2433 J9 IEE P-OPTOELECTRON JI IEE Proc.-Optoelectron. PD APR PY 1994 VL 141 IS 2 BP 127 EP 132 DI 10.1049/ip-opt:19949993 PG 6 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA NZ557 UT WOS:A1994NZ55700009 ER PT J AU FLOYD, S JACOBSON, V AF FLOYD, S JACOBSON, V TI THE SYNCHRONIZATION OF PERIODIC ROUTING MESSAGES SO IEEE-ACM TRANSACTIONS ON NETWORKING LA English DT Article AB The paper considers a network with many apparently-independent periodic processes and discusses one method by which these processes can inadvertently become synchronized. In particular, we study the synchronization of periodic routing messages, and offer guidelines on how to avoid inadvertent synchronization. Using simulations and analysis, we study the process of synchronization and show that the transition from unsynchronized to synchronized traffic is not one of gradual degradation but is instead a very abrupt 'phase transition': in general, the addition of a single router will convert a completely unsynchronized traffic stream into a completely synchronized one. We show that synchronization can be avoided by the addition of randomization to the traffic sources and quantify how much randomization is necessary. In addition, we argue that the inadvertent synchronization of periodic processes is likely to become an increasing problem in computer networks. RP FLOYD, S (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 32 TC 88 Z9 91 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1063-6692 J9 IEEE ACM T NETWORK JI IEEE-ACM Trans. Netw. PD APR PY 1994 VL 2 IS 2 BP 122 EP 136 DI 10.1109/90.298431 PG 15 WC Computer Science, Hardware & Architecture; Computer Science, Theory & Methods; Engineering, Electrical & Electronic; Telecommunications SC Computer Science; Engineering; Telecommunications GA QR379 UT WOS:A1994QR37900003 ER PT J AU HALLER, GM WOOLEY, BA AF HALLER, GM WOOLEY, BA TI A 700-MHZ SWITCHED-CAPACITOR ANALOG WAVE-FORM SAMPLING CIRCUIT SO IEEE JOURNAL OF SOLID-STATE CIRCUITS LA English DT Article ID MATCHING PROPERTIES; PERFORMANCE REPORT; MOS-TRANSISTORS; MEMORY UNIT; DESIGN; MICROSTORE; MISMATCH; VOLTAGE AB Analog switched-capacitor memory circuits are suitable for use in a wide range of applications where analog waveforms must be captured or delayed, such as the recording of pulse echo events and pulse shapes. Analog sampling systems based on switched-capacitor techniques offer performance superior to that of flash A/D converters and charge-coupled devices with respect to cost, density, dynamic range, sampling speed, and power consumption. This paper proposes an architecture with which sampling frequencies of several hundred megahertz can be achieved using conventional CMOS technology. Issues concerning the design and implementation of an analog memory circuit based on the proposed architecture are presented. An experimental two-channel memory with 32 sampling cells in each channel has been integrated in a 2-mum CMOS technology with poly-to-poly capacitors. The measured nonlinearity of this prototype is 0.03% for a 2.5 V input range, and the memory cell gain matching is 0.01% rms. The dynamic range of the memory exceeds 12 b for a sampling frequency of 700 MHz. The power dissipation for one channel operated from a single +5 V supply is 2 mW. C1 STANFORD UNIV, CTR INTEGRATED SYST, STANFORD, CA 94305 USA. RP HALLER, GM (reprint author), STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. NR 25 TC 16 Z9 17 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9200 EI 1558-173X J9 IEEE J SOLID-ST CIRC JI IEEE J. Solid-State Circuit PD APR PY 1994 VL 29 IS 4 BP 500 EP 508 DI 10.1109/4.280700 PG 9 WC Engineering, Electrical & Electronic SC Engineering GA NJ341 UT WOS:A1994NJ34100017 ER PT J AU CALLOWAY, TM DONOHOE, GW AF CALLOWAY, TM DONOHOE, GW TI SUBAPERTURE AUTOFOCUS FOR SYNTHETIC-APERTURE RADAR SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Letter ID PHASE ERRORS AB A subaperture autofocus algorithm for synthetic aperture radar (SAR) partitions range-compressed phase-history data collected over a full aperture into equal-width subapertures. Application of a one-dimensional Fourier transform to each range bin converts each subaperture data set into a full-scene image (map). Any linear phase difference, or phase ramp, between a pair of subapertures expresses itself as cross-range drift in their maps. A traditional autofocus algorithm fits a polynomial to inferred equal-width phase ramps. If the true phase error function contains significant high-order components, then polynomial regression generates a poor estimate of the phase error function. Instead of fitting a polynomial, we fit a sinusoidal function through the inferred phase ramps. An example with a degraded SAR image shows how a sinusoidal correction improves image quality. We compare lower bounds on mean squared error (MSE) for polynomial and sinusoidal parameterizations. Sinusoidal parameterization reduces MSE significantly for model orders greater than five. C1 UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. RP CALLOWAY, TM (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 10 TC 38 Z9 48 U1 1 U2 9 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD APR PY 1994 VL 30 IS 2 BP 617 EP 621 DI 10.1109/7.272285 PG 5 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA ND687 UT WOS:A1994ND68700032 ER PT J AU FOGLER, RJ HOSTETLER, LD HUSH, DR AF FOGLER, RJ HOSTETLER, LD HUSH, DR TI SAR CLUTTER SUPPRESSION USING PROBABILITY DENSITY SKEWNESS SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Letter AB A clutter suppression algorithm is described which exploits asymmetry in the probability density function (pdf) of ground clutter in synthetic-aperture radar (SAR) imagery. In the log-magnitude domain, the probability densities of returns from natural ground clutter and man-made objects exhibit opposite skewness. Using Pearson's second coefficient of skewness, we have observed negative skewness values for natural clutter regions and positive skewness values for buildings and simulated ground vehicles. Clutter suppression is achieved by attenuating regions having negative skewness relative to regions having positive skewness. Using this approach, we have obtained a 9 dB increase in target-to-clutter ratios in SAR images of rural scenes with buildings and other scenes with simulated ground vehicles embedded at various locations. We have also applied the skewness metric to the problem of segmenting man-made objects from clutter backgrounds. Here a slightly modified version of Pearson's second coefficient of skewness is used as a test statistic analogous to that of an ordered statistic (OS) constant false alarm rate (CFAR) algorithm. Segmentation of simulated ground vehicles embedded in natural ground clutter is demonstrated using the skewness test statistic. C1 UNIV NEW MEXICO,DEPT ELECT & COMP ENGN,ALBUQUERQUE,NM 87106. RP FOGLER, RJ (reprint author), SANDIA NATL LABS,DEPT 9137 MS 0356,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 10 TC 3 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD APR PY 1994 VL 30 IS 2 BP 622 EP 626 DI 10.1109/7.272286 PG 5 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA ND687 UT WOS:A1994ND68700033 ER PT J AU TAO, J CHEUNG, NW HU, CM AF TAO, J CHEUNG, NW HU, CM TI AN ELECTROMIGRATION FAILURE MODEL FOR INTERCONNECTS UNDER PULSED AND BIDIRECTIONAL CURRENT STRESSING SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article AB An electromigration failure model which can be used to project the electromigration lifetime under pulsed dc and ac current stressing has been reported. The experimental results indicate that different metallization systems (Al-2%Si, Al-4%Cu/TiW, and Cu) show similar failure behaviors, which can be explained and predicted by this model. The pulsed dc lifetime is found to be longer than dc lifetime, and the ac lifetime is found to be very much longer. This recognition can provide significant relief to circuit designs involving metals carrying pulsed dc and ac currents, and allow a more aggressive design to improve circuit density and speed. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP TAO, J (reprint author), UNIV CALIF BERKELEY,DEPT ELECT ENGN & COMP SCI,BERKELEY,CA 94720, USA. NR 11 TC 31 Z9 32 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD APR PY 1994 VL 41 IS 4 BP 539 EP 545 DI 10.1109/16.278507 PG 7 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA NG441 UT WOS:A1994NG44100011 ER PT J AU SOLOMON, OM AF SOLOMON, OM TI THE USE OF DFT WINDOWS IN SIGNAL-TO-NOISE RATIO AND HARMONIC DISTORTION COMPUTATIONS SO IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT LA English DT Article AB The discrete Fourier transform (DFT) can be used to compute the signal-to-noise ratio (SNR) and harmonic distortion of a waveform recorder. When the data record contains a non-integer number of cycles of the sine wave, energy leaks from the sine wave and its harmonics to adjacent frequencies. Reference [1) describes a windowed DFT method for computing the RMS value of a sine wave from the magnitude of the main lobe of its DFT and recommends the use of minimum energy windows. We present criteria for choosing the DFT window. A constraint for the window coefficients is derived to insure that quantization error does not influence the estimate of the amplitude of a sine wave from the main lobe of its DFT. C1 SANDIA NATL LABS,DEPT 4342,ALBUQUERQUE,NM 87185. NR 10 TC 48 Z9 48 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9456 J9 IEEE T INSTRUM MEAS JI IEEE Trans. Instrum. Meas. PD APR PY 1994 VL 43 IS 2 BP 194 EP 199 DI 10.1109/19.293419 PG 6 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA NU259 UT WOS:A1994NU25900016 ER PT J AU NIEMIALTOWSKI, MG GODFREY, VL ROUSE, BT AF NIEMIALTOWSKI, MG GODFREY, VL ROUSE, BT TI QUANTITATIVE STUDIES ON CD4+ AND CD8+ CYTOTOXIC T-LYMPHOCYTE RESPONSES AGAINST HERPES-SIMPLEX VIRUS TYPE-1 IN NORMAL AND BETA-2-M DEFICIENT MICE SO IMMUNOBIOLOGY LA English DT Article ID STEM-CELLS; INFECTED CELLS; COMPLEX; RECOGNIZE; CLONES; GENES; LYSIS AB Against herpes simplex virus type 1 (HSV-1) infected target cells, effector T cells of both CD4(-) CD8(+) and CD4(+) CD8(-) phenotypes occur in both man and mice. In man, the CD4(+) CD8(-) phenotype may dominate the response; but the situation in the mouse is unclear. In this report, several approaches are used to document the existence of HSV-1-specific cytotoxic T lymphocytes (CTL) of both phenotypes and to quantitate the frequency of their CTL precursors (CTL-p) in acutely HSV-1 infected animals. Evidence that CD4(+) CD8(-) CTL occur was confirmed with beta 2-m(-) mice lacking CD8(+) T cells and which generated CTL capable only of lysing MHC class II infected target cells. Comparisons of frequencies of CD4(+) CD8(-) and CD4- CD8(+) CTL-p showed the former to be 2-3-fold more frequent. The beta 2-m(-) mice generated only CD4(+) CD8(-) CTL-p and their frequencies approximately equally the CD4(+) CD8(-) CTL-P frequency in intact infected mice. Our results are discussed in terms of the value of the mouse model to study HSV-1 immunobiology. C1 UNIV TENNESSEE,COLL VET MED,DEPT MICROBIOL,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. FU NEI NIH HHS [R01 EY05093-07] NR 26 TC 14 Z9 14 U1 0 U2 0 PU GUSTAV FISCHER VERLAG PI JENA PA VILLENGANG 2, D-07745 JENA, GERMANY SN 0171-2985 J9 IMMUNOBIOLOGY JI Immunobiology PD APR PY 1994 VL 190 IS 3 BP 183 EP 194 PG 12 WC Immunology SC Immunology GA NL683 UT WOS:A1994NL68300001 PM 7916329 ER PT J AU SONG, YH LAMBERT, SM PRAUSNITZ, JM AF SONG, YH LAMBERT, SM PRAUSNITZ, JM TI A PERTURBED HARD-SPHERE-CHAIN EQUATION OF STATE FOR NORMAL FLUIDS AND POLYMERS SO INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH LA English DT Article ID PRESSURE-VOLUME-TEMPERATURE; STATISTICAL THERMODYNAMICS; AMORPHOUS POLYMERS; MOLECULAR FLUIDS; 0-2000 KG-CM2; LIQUIDS; PARAMETERS; BEHAVIOR; METHANE AB A perturbed hard-sphere-chain (PHSC) equation of state is presented which uses the modified Chiew equation of state for hard-sphere chains as the reference term, a van der Waals type perturbation term, and the Song-Mason method to relate equation-of-state parameters to the intermolecular potential. The PHSC equation requires three parameters to describe a pure fluid: the number of effective hard spheres per molecule, the segmental diameter, and the intermolecular potential-well depth between a nonbonded pair of segments. The PHSC equation reproduces the thermodynamic properties of a wide variety of normal fluids including polymers. Regressed parameters are related to characteristic molecular properties calculated from group contributions based on chemical structure. C1 LAWRENCE BERKELEY LAB, DIV CHEM ENGN, BERKELEY, CA 94720 USA. NR 62 TC 179 Z9 190 U1 0 U2 11 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0888-5885 J9 IND ENG CHEM RES JI Ind. Eng. Chem. Res. PD APR PY 1994 VL 33 IS 4 BP 1047 EP 1057 DI 10.1021/ie00028a037 PG 11 WC Engineering, Chemical SC Engineering GA NE812 UT WOS:A1994NE81200037 ER PT J AU DING, JM TAM, SW AF DING, JM TAM, SW TI ASYMPTOTIC POWER SPECTRUM ANALYSIS OF CHAOTIC BEHAVIOR IN FLUIDIZED-BEDS SO INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS LA English DT Article ID KINETIC-THEORY; GRANULAR FLOW; SYSTEMS AB The nonlinear behavior of fluidized beds is analyzed quantitatively using an asymptotic power spectrum method. A model based on kinetic theory is used to compute the voidage signals in a two-dimensional bubbling fluidized bed with a fluidization condition of U/U(mf) = 4, where U is the fluidizing velocity and U(mf) is the minimum fluidizing velocity. The data for power versus frequency in the asymptotic frequency regime are shown to obey a power-law falloff. This means that the bubbling fluidization under such a fluidization condition cannot be a low-dimensional strange attractor. Pressure fluctuation data, obtained from a three-dimensional bubbling fluidized bed, are also analyzed and clearly show the power-law falloff. This is consistent with previous findings in that the correlation dimension for these data cannot be small (i.e., 2 or 3). The differences between our findings and others axe discussed. RP DING, JM (reprint author), ARGONNE NATL LAB, DIV CHEM TECHNOL, 9700 S CASS AVE, ARGONNE, IL 60439 USA. NR 32 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0218-1274 J9 INT J BIFURCAT CHAOS JI Int. J. Bifurcation Chaos PD APR PY 1994 VL 4 IS 2 BP 324 EP 341 PG 18 WC Mathematics, Interdisciplinary Applications; Multidisciplinary Sciences SC Mathematics; Science & Technology - Other Topics GA NQ715 UT WOS:A1994NQ71500004 ER PT J AU GLARBORG, P DAMJOHANSEN, K MILLER, JA KEE, RJ COLTRIN, ME AF GLARBORG, P DAMJOHANSEN, K MILLER, JA KEE, RJ COLTRIN, ME TI MODELING THE THERMAL DENOX PROCESS IN FLOW REACTORS - SURFACE EFFECTS AND NITROUS-OXIDE FORMATION SO INTERNATIONAL JOURNAL OF CHEMICAL KINETICS LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; DEHYDROXYLATED SILICA; SELECTIVE REDUCTION; MATHEMATICAL-MODEL; NITRIC-OXIDE; SHOCK-TUBE; NO; AMMONIA; NH2; COMBUSTION AB We have investigated the impact of surface reactions such as NH3 decomposition and radical adsorption on quartz flow reactor data for Thermal DeNO(x) using a model that accounts for surface chemistry as well as molecular transport. Our calculations support experimental observations that surface effects are not important for experiments carried out in low surface to volume quartz reactors. The reaction mechanism for Thermal DeNO(x) has been revised in order to reflect recent experimental results. Among the important changes are a smaller chain branching ratio for the NH2 + NO reaction and a shorter NNH lifetime than previously used in modeling. The revised mechanism has been tested against a range of experimental flow reactor data for Thermal DeNO(x) with reasonable results. The formation of N2O in Thermal DeNO(x) has been modelled and calculations show good agreement with experimental data. The important reactions in formation and destruction of N2O have been identified. Our calculations indicate that N2O is formed primarily from the reaction between NH and NO, even though the NH2 + NO2 reaction possibly contributes at lower temperatures. At higher temperatures N2O concentrations are limited by thermal dissociation of N2O and by reaction with radicals, primarily OH. (C) 1994 John Wiley & Sons, Inc. C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94550. SANDIA NATL LABS,DEPT CHEM PROC SCI,ALBUQUERQUE,NM 87185. RP GLARBORG, P (reprint author), TECH UNIV DENMARK,DEPT CHEM ENGN,DK-2800 LYNGBY,DENMARK. NR 61 TC 92 Z9 98 U1 0 U2 12 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0538-8066 J9 INT J CHEM KINET JI Int. J. Chem. Kinet. PD APR PY 1994 VL 26 IS 4 BP 421 EP 436 DI 10.1002/kin.550260405 PG 16 WC Chemistry, Physical SC Chemistry GA NC583 UT WOS:A1994NC58300004 ER PT J AU MCNANEY, JM CANNON, RM RITCHIE, RO AF MCNANEY, JM CANNON, RM RITCHIE, RO TI NEAR-INTERFACIAL CRACK TRAJECTORIES IN METAL-CERAMIC LAYERED STRUCTURES SO INTERNATIONAL JOURNAL OF FRACTURE LA English DT Article ID TOUGHNESS; FRACTURE AB Experimental and theoretical analyses have been developed to analyze the path of a near-interfacial crack running nearly parallel to a ceramic/metal interface in a bimaterial layered structure. In the present study, the trajectories of cracks. initiated in the ceramic at varying distances from such interfaces, are investigated both experimentally and numerically. General trends in expected behavior, specifically that cracks propagate along a path defined by K(II) = 0, and that cracks are attracted to or repelled from a layer if it is relatively more or less compliant, respectively, are confirmed. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP MCNANEY, JM (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,CTR ADV MAT,BERKELEY,CA 94720, USA. RI Ritchie, Robert/A-8066-2008; McNaney, James/F-5258-2013 OI Ritchie, Robert/0000-0002-0501-6998; NR 29 TC 24 Z9 25 U1 0 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0376-9429 J9 INT J FRACTURE JI Int. J. Fract. PD APR 1 PY 1994 VL 66 IS 3 BP 227 EP 240 DI 10.1007/BF00042586 PG 14 WC Materials Science, Multidisciplinary; Mechanics SC Materials Science; Mechanics GA PB045 UT WOS:A1994PB04500004 ER PT J AU KANOUFF, M GREIF, R AF KANOUFF, M GREIF, R TI OSCILLATIONS IN THERMOCAPILLARY CONVECTION IN A SQUARE CAVITY SO INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER LA English DT Article ID MARANGONI NUMBER CONVECTION; FLOATING-ZONE AB The governing equations for momentum and energy transport have been solved for the thermocapillary flow in a differentially heated square cavity. The fluid was assumed to contain a surface active impurity such that the surface tension was a quadratic function of the temperature where the maximum surface tension occurs at the mean cavity temperature A Prandtl number of 0.1 was used because the primary interest here is for liquid metals. For low Marangoni numbers the flow was steady, stable and symmetric about the center vertical plane and consisted of two opposing vortices. For Marangoni numbers above 1200 the flow, given an initial disturbance, was oscillatory and in a periodic steady state. C1 UNIV CALIF BERKELEY,BERKELEY,CA 94720. RP KANOUFF, M (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94550, USA. NR 10 TC 15 Z9 15 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0017-9310 J9 INT J HEAT MASS TRAN JI Int. J. Heat Mass Transf. PD APR PY 1994 VL 37 IS 6 BP 885 EP 892 DI 10.1016/0017-9310(94)90214-3 PG 8 WC Thermodynamics; Engineering, Mechanical; Mechanics SC Thermodynamics; Engineering; Mechanics GA NJ931 UT WOS:A1994NJ93100001 ER PT J AU LI, W EBADIAN, MA WHITE, TL GRUBB, RG FOSTER, D AF LI, W EBADIAN, MA WHITE, TL GRUBB, RG FOSTER, D TI HEAT AND MASS-TRANSFER IN A CONTAMINATED POROUS CONCRETE SLAB WITH VARIABLE DIELECTRIC-PROPERTIES SO INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER LA English DT Article ID WATER-LADEN SANDSTONE AB The effect of temperature dependent dielectric properties on concrete decontamination and decommissioning using microwave technology is investigated theoretically in this paper. The concrete is treated as a porous material, which has residual water and air within the pores. A one-dimensional model of unsteady heat and mass transport in the porous concrete with temperature dependent dielectric properties is developed. Based on this model, temperature and pressure with different microwave frequencies are predicted, the effects of the temperature dependent dielectric properties on microwave power dissipation, the temperature and pressure distributions for different microwave frequencies, and the different microwave power intensities are analyzed in detail. Four available industrial microwave frequencies of 0.896, 2.45, 10.6 and 18.0 GHz are used in the analysis. As a result of the dielectric properties varying with temperature, the power dissipation also varies with the heating times. Comparing the results for both temperature dependent and constant dielectric properties reveals that the variation of dielectric permittivity with temperature must be considered in a theoretical model of the concrete decontamination and decommissioning process for a low microwave frequency (f < 2.45 GHz). C1 FLORIDA INT UNIV,DEPT MECH ENGN,MIAMI,FL 33199. OAK RIDGE NATL LAB,DIV FUS ENERGY,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831. NR 26 TC 12 Z9 12 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0017-9310 J9 INT J HEAT MASS TRAN JI Int. J. Heat Mass Transf. PD APR PY 1994 VL 37 IS 6 BP 1013 EP 1027 DI 10.1016/0017-9310(94)90226-7 PG 15 WC Thermodynamics; Engineering, Mechanical; Mechanics SC Thermodynamics; Engineering; Mechanics GA NJ931 UT WOS:A1994NJ93100013 ER PT J AU YOUNGDAHL, CK AF YOUNGDAHL, CK TI AN APPROXIMATE METHOD FOR THE DYNAMIC-RESPONSE OF STRAIN-HARDENING CLAMPED BEAMS SO INTERNATIONAL JOURNAL OF IMPACT ENGINEERING LA English DT Article AB An instantaneous mode solution is derived for a rigid, strain-hardening beam clamped against rotation at its ends. The associated differential equations for time-dependent amplitude and plastic region sizes are solved for a variety of loadings and types of matching conditions. Relative accuracy is determined and the best choice of matching condition is made. RP YOUNGDAHL, CK (reprint author), ARGONNE NATL LAB,DIV REACTOR ENGN,ARGONNE,IL 60439, USA. NR 5 TC 1 Z9 1 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0734-743X J9 INT J IMPACT ENG JI Int. J. Impact Eng. PD APR PY 1994 VL 15 IS 2 BP 101 EP 118 DI 10.1016/S0734-743X(05)80023-5 PG 18 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA MP370 UT WOS:A1994MP37000001 ER PT J AU PLIMPTON, S HENDRICKSON, B AF PLIMPTON, S HENDRICKSON, B TI PARALLEL MOLECULAR-DYNAMICS SIMULATIONS OF ORGANIC MATERIALS SO INTERNATIONAL JOURNAL OF MODERN PHYSICS C-PHYSICS AND COMPUTERS LA English DT Article; Proceedings Paper CT 2nd IMACS Conference on Computational Physics CY OCT 06-09, 1993 CL ST LOUIS, MO SP INT ASSOC MATH & COMP SIMULAT, ST LOUIS UNIV, PARKS COLL AB A new parallel algorithm suitable for molecular dynamics simulations of organic systems is presented. It reduces the communication cost and memory requirements of other commonly-used parallel algorithms by a factor of square-root P where P is the number of processors. The algorithm has been implemented in a CHARMM-like molecular dynamics model and its performance on 1024-processor nCUBE 2 and Intel Paragon machines is discussed. RP PLIMPTON, S (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87112, USA. NR 3 TC 5 Z9 5 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0129-1831 J9 INT J MOD PHYS C JI Int. J. Mod. Phys. C-Phys. Comput. PD APR PY 1994 VL 5 IS 2 BP 295 EP 298 DI 10.1142/S0129183194000350 PG 4 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA NR061 UT WOS:A1994NR06100025 ER PT J AU SUN, JG CHEN, MM CHAO, BT AF SUN, JG CHEN, MM CHAO, BT TI MODELING OF SOLIDS GLOBAL FLUCTUATIONS IN BUBBLING FLUIDIZED-BEDS BY STANDING SURFACE-WAVES SO INTERNATIONAL JOURNAL OF MULTIPHASE FLOW LA English DT Article DE FREQUENCY PREDICTION; SOLIDS GLOBAL FLUCTUATION; STANDING SURFACE WAVE ID PRESSURE-FLUCTUATIONS AB The characteristics of solids global fluctuation in gas fluidized beds was examined. It was identified that sloshing is a dominant mechanism in bubbling fluidized beds. Experiments were conducted using the computer-aided particle tracking facility to examine the solids sloshing motions and to determine the fluctuation frequency. For cylindrical beds of intermediate depths, there are two modes of sloshing; namely, the axisymmetric mode and the antisymmetric mode. A standing surface wave model has been developed to predict the global fluctuation frequency of the solids sloshings in beds of intermediate and shallow depth. The axisymmetric and the antisymmetric modes of sloshing in cylindrical beds are the full- and half-wave modes of the standing surface waves. The model predictions for the sloshing frequency were found to be in good agreement with the experimental data of this study and with others in the literature. More importantly, it was found that, although the excitation for bed fluctuations originates from bubbles, the fluctuation frequency is controlled by surface waves. C1 UNIV ILLINOIS,DEPT MECH & IND ENGN,URBANA,IL 61801. RP SUN, JG (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 38 TC 15 Z9 16 U1 0 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0301-9322 J9 INT J MULTIPHAS FLOW JI Int. J. Multiph. Flow PD APR PY 1994 VL 20 IS 2 BP 315 EP 338 DI 10.1016/0301-9322(94)90085-X PG 24 WC Mechanics SC Mechanics GA NN358 UT WOS:A1994NN35800007 ER PT J AU CHERUKAT, P MCLAUGHLIN, JB GRAHAM, AL AF CHERUKAT, P MCLAUGHLIN, JB GRAHAM, AL TI THE INERTIAL LIFT ON A RIGID SPHERE TRANSLATING IN A LINEAR SHEAR-FLOW FIELD SO INTERNATIONAL JOURNAL OF MULTIPHASE FLOW LA English DT Article DE INERTIA; LIFT; SHEAR; WALL ID LATERAL MIGRATION; PARTICLES; FORCE; PLANE; WALL AB The shear-induced inertial migration of a rigid sphere has been studied experimentally using a homogeneous shear flow apparatus. The experimentally measured migration velocities have been compared with those predicted by the asymptotic formulas previously given by Saffman and McLaughlin. The analysis of a sphere translating in a shear field in the presence of a single wall has been extended to the case of a sphere translating in a fluid undergoing a uniform shear between two parallel walls. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP CHERUKAT, P (reprint author), CLARKSON UNIV,DEPT CHEM ENGN,POTSDAM,NY 13699, USA. NR 19 TC 27 Z9 29 U1 0 U2 15 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0301-9322 J9 INT J MULTIPHAS FLOW JI Int. J. Multiph. Flow PD APR PY 1994 VL 20 IS 2 BP 339 EP 353 DI 10.1016/0301-9322(94)90086-8 PG 15 WC Mechanics SC Mechanics GA NN358 UT WOS:A1994NN35800008 ER PT J AU HACKEL, LA DANE, CB ZAPATA, LE HERMANN, MR AF HACKEL, LA DANE, CB ZAPATA, LE HERMANN, MR TI PHASE CONJUGATED LASERS APPLIED TO X-RAY GENERATION SO INTERNATIONAL JOURNAL OF NONLINEAR OPTICAL PHYSICS LA English DT Article ID PROJECTION LITHOGRAPHY; FIDELITY AB Three laser systems that are being developed for use in X-ray generation which incorporate SBS phase conjugate mirrors are described. A 25 J/pulse Nd:glass laser is being developed for commercial proximity print X-ray lithography; a 0.5 J/pulse, 1.3 kHz pulse repetition frequency laser is being built for soft X-ray projection lithography; and a 1 kJ/pulse laser driver for a table top X-ray laser has been designed. The results of prototypical experimental investigations are presented and the basic design principles for high average power phase conjugated laser systems shared by each of these lasers are discussed. RP HACKEL, LA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 21 TC 1 Z9 1 U1 1 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0218-1991 J9 INT J NONLINEAR OPT PD APR PY 1994 VL 3 IS 2 BP 137 EP 167 DI 10.1142/S0218199194000134 PG 31 WC Optics; Physics, Applied SC Optics; Physics GA PU628 UT WOS:A1994PU62800002 ER PT J AU LUCAS, JN AF LUCAS, JN TI NON-LEUKEMIA-RELATED CHROMOSOME TRANSLOCATION FREQUENCY MEASURED FROM THE PATIENTS BLOOD SO INTERNATIONAL JOURNAL OF OCCUPATIONAL MEDICINE AND TOXICOLOGY LA English DT Proceedings Paper CT International Symposium on Biological Effects of Low Level Exposures to Radiation and Related Agents (ISBELLES 93) CY OCT 12-16, 1993 CL CHANGCHUN, PEOPLES R CHINA SP CHINESE SOC RADIOL MED & PROTECT, CHINESE MED ASSOC ID RADIATION; HYBRIDIZATION; CELLS AB This article describes a new method used to measure pre-cancer-related genetic damage in a patient diagnosed with early B-precursor acute lymphoblastic leukemia. The method allows total separation of the malignant B-lymphocytes and normal T-lymphocytes. It employs lymphocyte separation by a rosetting method and chromosome translocation analysis using chromosome painting. In the case presented here, the utility of this approach is illustrated using blood lymphocytes obtained from a nuclear dockyard worker who claimed his leukemia was induced by work-related radiation exposures. Blood lymphocytes were obtained after diagnosis of the disease, but prior to therapy. Measurements were made of (1) the translocation frequency in separated normal T-lymphocytes and (2) the translocation frequency in PHA-stimulated lymphocytes, which include a fraction of the malignant B cells. The approach described here avoids contamination by cytogenetically unstable malignant B cells, and thus makes possible biodosimetry of pre-cancer exposures in these patients. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 15 TC 0 Z9 0 U1 0 U2 0 PU PRINCETON SCIENTIFIC PUBL INC PI PRINCETON PA PO BOX 2155, PRINCETON, NJ 08543 SN 1054-044X J9 INT J OCCUP MED TOX JI Int. J. Occup. Med. Toxicol. PD APR-JUN PY 1994 VL 3 IS 2 BP 137 EP 142 PG 6 WC Biochemistry & Molecular Biology; Environmental Sciences; Public, Environmental & Occupational Health; Toxicology SC Biochemistry & Molecular Biology; Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Toxicology GA QH048 UT WOS:A1994QH04800006 ER PT J AU FUCIARELLI, AF SISK, EC ZIMBRICK, JD AF FUCIARELLI, AF SISK, EC ZIMBRICK, JD TI ELECTRON MIGRATION IN OLIGONUCLEOTIDES UPON GAMMA-IRRADIATION IN SOLUTION SO INTERNATIONAL JOURNAL OF RADIATION BIOLOGY LA English DT Article ID AQUEOUS-SOLUTION; PULSE-RADIOLYSIS; ENERGY-TRANSFER; CELLULAR RADIOSENSITIZATION; 5-BROMOURACIL SUBSTITUTION; PARA-NITROACETOPHENONE; RADICAL-ANIONS; CHEMICAL BASIS; SOLID DNA; BASES AB Electron migration in irradiated solutions of DNA was investigated using 5-bromouracil synthetically incorporated into oligonucleotides of defined base composition as a molecular indicator of electron interactions. Solvated electrons interact quantitatively with 5-bromouracil, leading to a highly reactive 5-yl radical which can abstract an adjacent hydrogen atom to yield uracil. Yields of uracil, or loss of 5-bromouracil, from irradiated oligonucleotide samples were measured using gas chromatography-mass spectrometric analysis of their trimethylsilylated acid hydrolysates. To examine the effects of base composition and DNA conformation on electron migration, a set of oligonucleotides containing 5-bromouracil at selected positions with three base (guanine, cytosine, thymine or adenine) spacers (e.g. [BrU(GGG)(3)](3)) were irradiated in their single- or double-stranded form following annealing with appropriate complementary sequences. Differences in uracil yields suggested that electron migration occurred to different extents in oligonucleotides containing different base sequences. In irradiated single-stranded oligonucleotides, the yield of uracil decreased in the order A >T > > C approximate to G. However, in irradiated double-stranded oligonucleotides, the yield of uracil decreased in the order G > C approximate to T > A. These differences were attributed to proton-transfer reactions facilitated by base pairing in double-stranded oligonucleotides. The distance over which the elctron would migrate was then determined using a series of oligonucleotides containing 5-bromouracil at selected positions with guanine spacers (i.e. [BrU(G)(n)](3) (n = 3, 5, 7, 9). Oligonucleotides were irradiated in their double-stranded form following annealing with the appropriate complementary sequences. Analysis of the loss of 5-bromouracil revealed that electron migration occurred efficiently over c. 3-4 guanine bases assuming that migration could occur as efficiently in either direction along the DNA molecule. These data can be compared with studies reporting more extensive migration for electrons generated by direct ionization of DNA. RP FUCIARELLI, AF (reprint author), PACIFIC NW LAB, DEPT BIOL & CHEM P756, PO BOX 999, RICHLAND, WA 99352 USA. NR 36 TC 32 Z9 32 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0955-3002 J9 INT J RADIAT BIOL JI Int. J. Radiat. Biol. PD APR PY 1994 VL 65 IS 4 BP 409 EP 418 DI 10.1080/09553009414550481 PG 10 WC Biology; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA NF240 UT WOS:A1994NF24000002 PM 7908928 ER PT J AU ZIMMERMAN, RW MYER, LR COOK, NGW AF ZIMMERMAN, RW MYER, LR COOK, NGW TI GRAIN AND VOID COMPRESSION IN FRACTURED AND POROUS ROCKS SO INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES & GEOMECHANICS ABSTRACTS LA English DT Note ID EFFECTIVE STRESS; BEHAVIOR C1 LAWRENCE BERKELEY LAB,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP ZIMMERMAN, RW (reprint author), LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720, USA. OI Zimmerman, Robert/0000-0001-6674-3403 NR 15 TC 11 Z9 11 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0148-9062 J9 INT J ROCK MECH MIN JI Int. J. Rock Mech. Min. Sci. PD APR PY 1994 VL 31 IS 2 BP 179 EP 184 DI 10.1016/0148-9062(94)92809-6 PG 6 WC Engineering, Geological; Mining & Mineral Processing SC Engineering; Mining & Mineral Processing GA NQ426 UT WOS:A1994NQ42600011 ER PT J AU HSU, WL MCMASTER, MC COLTRIN, ME DANDY, DS AF HSU, WL MCMASTER, MC COLTRIN, ME DANDY, DS TI MOLECULAR-BEAM MASS-SPECTROMETRY STUDIES OF CHEMICAL-VAPOR-DEPOSITION OF DIAMOND SO JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS LA English DT Article; Proceedings Paper CT 15th Dry Process Symposium (DPS 1993) CY NOV 01-02, 1993 CL ZENDENTSURODO KAIKAN, TOKYO, JAPAN HO ZENDENTSURODO KAIKAN DE DIAMOND CVD; CHEMISTRY; MASS SPECTROMETRY; HOT-FILAMENT DEPOSITION; MODELING ID GROWTH; ENVIRONMENT; KINETICS AB We have developed a novel molecular beam mass spectrometry technique that can quantitatively analyze the gas-phase composition in a chemical vapor deposition (CVD) reactor. The technique simultaneously monitors a wide variety of radical and stable species, and their concentrations can be determined with sensitivities approaching 1 ppm. Measurements performed in a diamond deposition system have provided keen insights into the important phenomena that affect the growth environment. In this paper we first discuss the primary gas sampling design issues. In the second part, details of the experimental results and their implications are described. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. COLORADO STATE UNIV,DEPT CHEM ENGN,FT COLLINS,CO 80523. RP HSU, WL (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. RI Dandy, David/G-6984-2012 OI Dandy, David/0000-0003-3254-0717 NR 29 TC 30 Z9 32 U1 0 U2 2 PU JAPAN J APPLIED PHYSICS PI MINATO-KU TOKYO PA DAINI TOYOKAIJI BLDG 24-8 SHINBASHI 4-CHOME, MINATO-KU TOKYO 105, JAPAN SN 0021-4922 J9 JPN J APPL PHYS 1 JI Jpn. J. Appl. Phys. Part 1 - Regul. Pap. Short Notes Rev. Pap. PD APR PY 1994 VL 33 IS 4B BP 2231 EP 2239 DI 10.1143/JJAP.33.2231 PG 9 WC Physics, Applied SC Physics GA NR959 UT WOS:A1994NR95900018 ER PT J AU FUNG, KH IMRE, DG TANG, IN AF FUNG, KH IMRE, DG TANG, IN TI DETECTION LIMITS FOR SULFATES AND NITRATES IN AEROSOL-PARTICLES BY RAMAN-SPECTROSCOPY SO JOURNAL OF AEROSOL SCIENCE LA English DT Article ID SCATTERING; DROPLETS; WATER AB Detection limits by Raman spectroscopy are reported for sulfates and nitrates as trace constituents in aerosol particles. The aerosol particles under investigation are either single suspended solid particles with a diameter of 15 mum or present in a monodisperse particle stream generated by a vibrating orifice with a droplet diameter of 45 mum. The visible lines of a continuous wave (cw) Argon ion laser are used as the excitation source. Using the state-of-the art charge coupled device (CCD) detector, high sensitivity is achieved even for spontaneous Raman scattering. For suspended solid particles containing sodium nitrate as the trace constituent, the detection limit (S/N = 1) is about 4 x 10(-15) moles or 3 x 10(9) molecules. For solution droplets, the detection limit is 2.5 millimolar for both sulfates and nitrates ions in aqueous solutions. A comparison of the sensitivities between spontaneous and stimulated Raman scattering (SRS) shows that the sensitivity of the spontaneous Raman scattering is at least 20-40 times higher than that of SRS. RP FUNG, KH (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV ENVIRONM CHEM,UPTON,NY 11973, USA. NR 16 TC 38 Z9 38 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0021-8502 J9 J AEROSOL SCI JI J. Aerosol. Sci. PD APR PY 1994 VL 25 IS 3 BP 479 EP 485 DI 10.1016/0021-8502(94)90065-5 PG 7 WC Engineering, Chemical; Engineering, Mechanical; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA NQ279 UT WOS:A1994NQ27900004 ER PT J AU NOBILE, A MOSLEY, WC HOLDER, JS BROOKS, KN AF NOBILE, A MOSLEY, WC HOLDER, JS BROOKS, KN TI DEUTERIUM ABSORPTION AND MATERIAL PHASE CHARACTERISTICS OF ZR2FE SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article ID GETTERING ALLOYS; HYDROGEN; FE AB Deuterium absorption and material phase characteristics of Zr2Fe (SAES St 198) were studied. Scanning electron microscope images of polished surfaces, electron probe microanalysis and X-ray powder diffractometry indicated the presence of a continuous Zr2Fe phase with secondary phases of ZrFe2, Zr5FeSn, alpha-Zr and Zr6Fe3O. A statistically-designed experiment to determine the effects of temperature, time and vacuum quality on activation of St 198 revealed that when activated at low temperature (350-degrees-C) deuterium absorption rate at 350-degrees-C was slower when the vacuum quality was poor (2.5 Pa vs. 3 X 10(-4) Pa). However, at higher activation temperature (500-degrees-C), deuterium absorption rate at 350-degrees-C was fast and was independent of vacuum quality. Deuterium pressure-composition-temperature (P-C-T) data are reported for St 198 in the temperature range 200-500-degrees-C. The P-C-T data over the full range of deuterium loading and at temperatures of 350-degrees-C and below are described by the following expression given in terms of the equilibrium D2 absorption pressure, P(D2), and the getter loading, q: K0e- (DELTAH(a)/RT) = q2/P(D2)(q*-q)2 where DELTAH(a) and K0 have values of 101.8 kJ mol-1 and 3.24 X 10(-8) Pa-1, respectively, and q* is 15.998 kPa L-1 g-1. At higher temperatures, one or more secondary reactions in the solid phase occur that slowly consume D2 from the gas phase. X-ray diffraction and other data suggest these reactions to be: 2Zr2FeDx --> xZrD2 + x/3 ZrFe2 +(2 - 2/3x)Zr2Fe Zr2FeDx +(2- 1/2x)D2 --> 2ZrD2+Fe where 0 beta transformation in plutonium is studied as a function of heating rate by differential scanning calorimetry over the range 0.01-degrees-C min-1 to 10-degrees-C min-1. Consistent with the fact that the transformation is controlled by nucleation and growth, the onset temperature and the temperature range of the reaction are shown to depend markedly upon heating rate. By investigating heating rates up to a factor of 100 lower than usual we show: (1) Earlier calorimetric measurements report onset temperatures for the transformation which are too high. (2) The Kissinger analysis, which predicts the scanning rate parameter to vary linearly with reciprocal temperature, does not fit the results of this study. (3) With increased scanning rate, the transformation occurs at higher temperatures, and the growth rate of the beta phase at a constant fraction transformed is proportional to this temperature increase. C1 LOS ALAMOS NATL LAB,DIV NUCL MATT TECHNOL,LOS ALAMOS,NM 87545. NR 25 TC 9 Z9 9 U1 2 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD APR PY 1994 VL 206 IS 1 BP 103 EP 108 DI 10.1016/0925-8388(94)90016-7 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA NE187 UT WOS:A1994NE18700015 ER PT J AU MENG, WJ SELL, JA PERRY, TA REHN, LE BALDO, PM AF MENG, WJ SELL, JA PERRY, TA REHN, LE BALDO, PM TI GROWTH OF ALUMINUM NITRIDE THIN-FILMS ON SI(111) AND SI(001) - STRUCTURAL CHARACTERISTICS AND DEVELOPMENT OF INTRINSIC STRESSES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID REACTIVE SPUTTER-DEPOSITION; POLYCRYSTALLINE; SILICON; AIN; CU AB We have grown aluminum nitride thin films by ultrahigh vacuum reactive sputter deposition on Si(111) and Si(001) substrates. We show results of film characterization by Raman scattering, ion beam channeling, and transmission electron microscopy, which establish the occurrence of epitaxial growth of wurtzitic aluminum nitride thin films on Si(111) at temperatures above 600-degrees-C. In contrast, microstructural characterization by transmission electron microscopy shows the formation of highly oriented polycrystalline wurtzitic aluminum nitride thin films on Si(001). Real-time substrate curvature measurements reveal the existence of large intrinsic stresses in aluminum nitride thin films grown on both Si(111) and Si(001) substrates. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP MENG, WJ (reprint author), GM CORP,CTR RES & DEV,DEPT PHYS,WARREN,MI 48090, USA. NR 39 TC 72 Z9 72 U1 1 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 1 PY 1994 VL 75 IS 7 BP 3446 EP 3455 DI 10.1063/1.356105 PG 10 WC Physics, Applied SC Physics GA NC839 UT WOS:A1994NC83900028 ER PT J AU STEIN, HJ HAHN, SK AF STEIN, HJ HAHN, SK TI HYDROGEN INTRODUCTION AND HYDROGEN-ENHANCED THERMAL DONOR FORMATION IN SILICON SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID OXYGEN DIFFUSION; CRYSTALLINE SILICON; SI; PRECIPITATION; 500-DEGREES-C; TEMPERATURES; KINETICS; DEFECTS; PLASMA; CARBON AB Hydrogen has been introduced from a rf plasma into Czochralski Si at 275-degrees-C. Most of the hydrogen is trapped near the surface where it forms Si-H bonds, but a small fraction diffuses into the Si. This fraction enhances oxygen-related thermal donor (TD) formation rates in a diffusionlike profile during subsequent furnace anneals between 350 and 400-degrees-C. A hydrogen concentration that is only a few percent of the oxygen concentration is sufficient to enhance the TD formation rate, indicative of a hydrogen-catalyzed process. Maximum concentrations for TDs after annealing at 400-degrees-C exceed that for retained hydrogen. A mechanism of hydrogen diffusion through oxygen traps and correlated hydrogen-promoted oxygen diffusion is proposed to explain the enhanced TD formation rates. C1 STANFORD UNIV,DEPT MAT SCI & ENGN,STANFORD,CA 94305. RP STEIN, HJ (reprint author), SANDIA NATL LABS,DEPT 1111,ALBUQUERQUE,NM 87185, USA. NR 38 TC 67 Z9 67 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 1 PY 1994 VL 75 IS 7 BP 3477 EP 3484 DI 10.1063/1.356109 PG 8 WC Physics, Applied SC Physics GA NC839 UT WOS:A1994NC83900032 ER PT J AU HAHN, W LOEWENHAUPT, M FELCHER, GP HUANG, YY PARKIN, SSP AF HAHN, W LOEWENHAUPT, M FELCHER, GP HUANG, YY PARKIN, SSP TI FE/CR MULTILAYERS - EFFECT OF ANNEALING ON THE SPIN STRUCTURE AND MAGNETORESISTANCE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID LAYERED MAGNETIC-STRUCTURES; ANTIFERROMAGNETIC INTERLAYER EXCHANGE; POLARIZED-NEUTRON-REFLECTION; GIANT MAGNETORESISTANCE; FE LAYERS; SUPERLATTICES; FILMS AB The spin structure of antiferromagnetic Fe/Cr multilayers has been investigated by polarized neutron reflectivity. Measurements were taken on freshly sputtered films as well as films annealed at different temperatures. For annealing temperatures up to 350-degrees-C adjacent Fe layers were found to remain antiferromagnetic, but the coupling strength gradually decreases. In multilayers annealed at higher temperature both antiferro- and ferromagnetic phases are present. In all cases the magnetoresistance is proportional to the amount of antiferromagnetism. The presence of off-specular, diffuse scattering around the antiferromagnetic Bragg peak indicates that the magnetic domains are laterally limited; however, their size is not correlated directly to the magnetoresistance. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. IBM CORP,ALMADEN RES CTR,SAN JOSE,CA 95120. RP HAHN, W (reprint author), KFA JULICH,FORSCHUNGSZENTRUM,INST FESTKORPERFORSCH,D-52425 JULICH,GERMANY. RI Parkin, Stuart/D-2521-2012 NR 25 TC 18 Z9 18 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 1 PY 1994 VL 75 IS 7 BP 3564 EP 3570 DI 10.1063/1.356093 PG 7 WC Physics, Applied SC Physics GA NC839 UT WOS:A1994NC83900044 ER PT J AU BLACKBURN, JA GRONBECHJENSEN, N SMITH, HJT AF BLACKBURN, JA GRONBECHJENSEN, N SMITH, HJT TI HARMONIC SYNCHRONIZATION IN RESISTIVELY COUPLED JOSEPHSON-JUNCTIONS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID TRANSMISSION-LINE; PHASE-LOCKING; WEAK LINKS AB The oscillations of two resistively coupled Josephson junctions biased only by a single dc current source are shown to lock harmonically in a 1:2 mode over a significant range of bias current, even when the junctions are identical. The dependence of this locking on both junction and coupling parameters is examined, and it is found that, for this particular two-junction configuration, 1:1 locking can never occur, and also that a minimum coupling coefficient is needed to support harmonic locking. Some issues related to subharmonic locking are also discussed. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV WATERLOO,DEPT PHYS,WATERLOO N2L 3G1,ONTARIO,CANADA. RP BLACKBURN, JA (reprint author), WILFRID LAURIER UNIV,DEPT PHYS & COMP,WATERLOO N2L 3C5,ONTARIO,CANADA. NR 17 TC 0 Z9 0 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 1 PY 1994 VL 75 IS 7 BP 3668 EP 3673 DI 10.1063/1.356082 PG 6 WC Physics, Applied SC Physics GA NC839 UT WOS:A1994NC83900061 ER PT J AU MAK, JE BRENNINKMEIJER, CAM AF MAK, JE BRENNINKMEIJER, CAM TI COMPRESSED-AIR SAMPLE TECHNOLOGY FOR ISOTOPIC ANALYSIS OF ATMOSPHERIC CARBON-MONOXIDE SO JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY LA English DT Article AB A methodology for the collection of large ( 1000 L) air samples for isotopic analysis of atmospheric carbon monoxide is presented. A low-background, high-pressure, high-flow sampling system with a residual background of less than 2 ppbv CO has been built and employed for collection of samples both from the ground and from an aircraft platform. The time required for obtaining a 1000-L sample pressurized to 600 psi was approximately 30 min on the ground, and 75 min at 8-km altitude. Following collection, samples were analyzed for CO concentration, C-13 O-18, and C-14 using cryogenic vacuum extraction followed by stable isotope ratio mass spectrometry and accelerator mass spectrometry. Standard deviation for delta C-13 is 0.2 per mil, for delta O-18 0.8 per mil, and for CO-14 0.5 molecules per cubic centimeter (STP). RP MAK, JE (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV PHYS,POB 808,7000 E AVE L-262,LIVERMORE,CA 94550, USA. RI Brenninkmeijer, Carl/B-6860-2013 NR 0 TC 41 Z9 41 U1 2 U2 5 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0739-0572 J9 J ATMOS OCEAN TECH JI J. Atmos. Ocean. Technol. PD APR PY 1994 VL 11 IS 2 BP 425 EP 431 DI 10.1175/1520-0426(1994)011<0425:CASTFI>2.0.CO;2 PN 2 PG 7 WC Engineering, Ocean; Meteorology & Atmospheric Sciences SC Engineering; Meteorology & Atmospheric Sciences GA NE049 UT WOS:A1994NE04900001 ER PT J AU WATANABE, Y YOSHIDA, SH ANSARI, AA GERSHWIN, ME AF WATANABE, Y YOSHIDA, SH ANSARI, AA GERSHWIN, ME TI THE CONTRIBUTION OF H-2(BM12) AND NON H-2 BACKGROUND GENES ON MURINE LUPUS IN NZB.H-2(BM12/B) MICE SO JOURNAL OF AUTOIMMUNITY LA English DT Article ID NEW-ZEALAND MICE; RECOMBINANT INBRED LINES; NZB-MICE; RETROVIRUS EXPRESSION; AUTO-IMMUNITY; BLACK MICE; AUTOIMMUNE TRAITS; RENAL-DISEASE; BONE-MARROW; BETA-CHAIN C1 LAWRENCE LIVERMORE NATL LAB,SCH MED,DEPT INTERNAL MED,DAVIS,CA 95616. FU NCI NIH HHS [CA 20816] NR 29 TC 5 Z9 5 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0896-8411 J9 J AUTOIMMUN JI J. Autoimmun. PD APR PY 1994 VL 7 IS 2 BP 153 EP 164 DI 10.1006/jaut.1994.1012 PG 12 WC Immunology SC Immunology GA NH863 UT WOS:A1994NH86300002 PM 8037836 ER PT J AU BUTLER, RM OVERBEEK, RA AF BUTLER, RM OVERBEEK, RA TI FORMULA DATABASES FOR HIGH-PERFORMANCE RESOLUTION PARAMODULATION SYSTEMS SO JOURNAL OF AUTOMATED REASONING LA English DT Article DE RESOLUTION PARAMODULATION SYSTEMS; FORMULA DATABASE; DEDUCTION SYSTEM AB Over the past 25 years, researchers have written numerous deduction systems based on resolution and paramodulation. Of these systems, very few have been capable of generating and maintaining a formula database containing more than just a few thousand clauses. These few systems were used to explore mechanisms for rapidly extracting limited subsets of 'relevant' clauses. We have developed a simple, powerful deduction system that reflects some of the best of the ideas that have emerged from the research. This paper describes that deduction system and casts the idea in a form that makes them easily accessible to researchers wishing to write their own high-performance systems. C1 UNIV N FLORIDA,COLL COMP SCI & ENGN,JACKSONVILLE,FL 32216. ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439. NR 9 TC 1 Z9 1 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0168-7433 J9 J AUTOM REASONING JI J. Autom. Reasoning PD APR PY 1994 VL 12 IS 2 BP 139 EP 156 DI 10.1007/BF00881885 PG 18 WC Computer Science, Artificial Intelligence SC Computer Science GA PG685 UT WOS:A1994PG68500001 ER PT J AU WOS, L AF WOS, L TI THE PROBLEM OF HYPERPARAMODULATION SO JOURNAL OF AUTOMATED REASONING LA English DT Article DE AUTOMATED REASONING; HYPERPARAMODULATION; INFERENCE RULE; UNSOLVED RESEARCH PROBLEM AB This article is the thirty-second of a series of articles discussing various open research problems in automated reasoning. The problem proposed for research asks one to find a variant of the inference rule hyperparamodulation that avoids generating many of the binary paramodulants ordinarily deduced. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. NR 10 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0168-7433 J9 J AUTOM REASONING JI J. Autom. Reasoning PD APR PY 1994 VL 12 IS 2 BP 265 EP 271 DI 10.1007/BF00881890 PG 7 WC Computer Science, Artificial Intelligence SC Computer Science GA PG685 UT WOS:A1994PG68500006 ER PT J AU BLACK, TA WOLK, CP AF BLACK, TA WOLK, CP TI ANALYSIS OF A HET(-) MUTATION IN ANABAENA SP STRAIN PCC-7120 IMPLICATES A SECONDARY METABOLITE IN THE REGULATION OF HETEROCYST SPACING SO JOURNAL OF BACTERIOLOGY LA English DT Article ID BLUE-GREEN-ALGA; ESCHERICHIA-COLI; NUCLEOTIDE-SEQUENCE; POLYKETIDE SYNTHASE; PATTERN-FORMATION; SACCHAROPOLYSPORA-ERYTHRAEA; RHIZOBIUM-MELILOTI; BIOSYNTHETIC GENES; MOLECULAR-CLONING; CYANOBACTERIUM AB Transposon-generated mutant N10 of Anabaena sp. strain PCC 7120 has a Het(-) phenotype (A. Ernst, T. Black, Y. Cai, J.-M. Panoff, D. N. Tiwari, and C. P. Wolk, J. Bacteriol. 174:6025-6032, 1992). Reconstruction of the transposon mutation reproduced a Het(-) phenotype, but reconstructions with other insertions at the position of the transposon produced strains that form multiple contiguous heterocysts. Sequence analysis around the site of insertion of the transposon showed that the insertion lies within the 5' end of an 861-bp open reading frame (ORF) (hetN). The product of translation of hetN (HetN) shows extensive similarity to NAD(P)H-dependent oxidoreductases that are involved in biosyntheses of fatty acids, poly-beta-hydroxybutyrate, nod factor, and polyketides. A second, 1,518-bp ORF (hetM) that ends 556 bp 5' from the start of hetN appears to encode a protein that has at least two functional domains: its amino terminus is similar to an acyl carrier protein, while its central portion is similar to domains of proteins that perform reductive reactions. A third, 711-bp ORF (hetI) encoded on the opposite strand ends 42 bp away from the 3' end of hetN. The protein encoded by hetI, HetI, is similar to Sfp from Bacillus subtilis and EntD from Escherichia coli, proteins that are required for the biosynthesis or export of cyclic peptides. Clones from a lambda-EMBL3 library that contain the wild-type DNA for hetN do not complement the hetN::Tn5-1063 mutation in N10. The presence of hetN, as the only ORF, on a replicating plasmid suppresses heterocyst formation in wild-type cells, whereas the additional presence of hetI alleviates this effect. C1 MICHIGAN STATE UNIV,PLANT RES LAB,US DOE,E LANSING,MI 48824. NR 53 TC 126 Z9 134 U1 1 U2 3 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0021-9193 J9 J BACTERIOL JI J. Bacteriol. PD APR PY 1994 VL 176 IS 8 BP 2282 EP 2292 PG 11 WC Microbiology SC Microbiology GA NG717 UT WOS:A1994NG71700020 PM 8157596 ER PT J AU JOHNSTON, RG GRACE, WK LEMANSKI, CL MALLAWAARATCHY, AR AF JOHNSTON, RG GRACE, WK LEMANSKI, CL MALLAWAARATCHY, AR TI REAL-TIME DETECTION OF DNA DURING GEL-ELECTROPHORESIS USING A ZEEMAN REFRACTIVE-INDEX DETECTOR SO JOURNAL OF BIOCHEMICAL AND BIOPHYSICAL METHODS LA English DT Article DE GEL ELECTROPHORESIS; REFRACTIVE INDEX; REAL-TIME DETECTOR; ONLINE DETECTION; ZEEMAN INTERFEROMETRY ID LIQUID-CHROMATOGRAPHY; INTERFEROMETRY AB We have developed a new method for detecting unstained, untagged, unlabeled DNA bands in rear-time during gel electrophoresis. This technique is based on the use of a Zeeman refractive index detector with lambda/12000 resolution and outstanding stability. Current sensitivity in a polyacrylamide gel is 0.2 ng of DNA in the probe beam. We believe this can be significantly improved. We don't understand why the DNA initially decreases, then dramatically increases, the local refractive index as it passes through the gel, although we propose three possible mechanisms. RP JOHNSTON, RG (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 27 TC 2 Z9 2 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-022X J9 J BIOCHEM BIOPH METH JI J. Biochem. Biophys. Methods PD APR PY 1994 VL 28 IS 3 BP 225 EP 237 DI 10.1016/0165-022X(94)90019-1 PG 13 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA NJ099 UT WOS:A1994NJ09900007 PM 8064117 ER PT J AU THNG, JPH GUO, XW SWANK, RA CRISSMAN, HA BRADBURY, EM AF THNG, JPH GUO, XW SWANK, RA CRISSMAN, HA BRADBURY, EM TI INHIBITION OF HISTONE PHOSPHORYLATION BY STAUROSPORINE LEADS TO CHROMOSOME DECONDENSATION SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID PROTEIN KINASE-C; LYSINE-RICH HISTONE; CELL-CYCLE; POTENT INHIBITOR; G2 PHASE; PHYSARUM-POLYCEPHALUM; H3 PHOSPHORYLATION; MAMMALIAN-CELLS; CDC2 KINASE; CONDENSATION AB In mammalian cells, hyperphosphorylation of histone H1 and phosphorylation of histone H3 correlate well with the G2 phase to metaphase condensation of chromosomes, and these phosphorylations most probably have a role in initiating and controlling the entry into mitosis. The protein kinase inhibitor staurosporine has been used to examine the role of H1 and H3 phosphorylations in controlling chromosome condensation in the mouse FM3A cell line. We present evidence that (i) staurosporine inhibits the protein kinases that phosphorylate histone H1 during mitosis, (ii) staurosporine also inhibits the histone H3-specific kinase, (iii) the inhibition of these kinase activities prevent cells from entering mitosis, and (iv) addition of staurosporine to cells already arrested at metaphase by nocodazole causes a rapid dephosphorylation of histones H1 and H3 and the decondensation of the metaphase chromosomes. The results show that the hyperphosphorylation of histone H1 and phosphorylation of histone H3 are required to maintain metaphase chromosomes in their condensed state. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. RP THNG, JPH (reprint author), UNIV CALIF DAVIS,SCH MED,DEPT BIOL CHEM,DAVIS,CA 95616, USA. FU NIGMS NIH HHS [GM45890-01] NR 43 TC 72 Z9 72 U1 0 U2 0 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD APR 1 PY 1994 VL 269 IS 13 BP 9568 EP 9573 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA NE053 UT WOS:A1994NE05300029 PM 8144543 ER PT J AU UNER, DO PRUSKI, M GERSTEIN, BC KING, TS AF UNER, DO PRUSKI, M GERSTEIN, BC KING, TS TI HYDROGEN CHEMISORPTION ON POTASSIUM-PROMOTED SUPPORTED RUTHENIUM CATALYSTS SO JOURNAL OF CATALYSIS LA English DT Article ID FISCHER-TROPSCH SYNTHESIS; THERMAL-DESORPTION; ADSORBED HYDROGEN; ALKALI; NMR; CO; SPECTROSCOPY; ADSORPTION; RU(001); SELECTIVITY AB The interaction of hydrogen on potassium promoted catalysts prepared by both sequential and co-impregnation methods was studied by proton NMR spectroscopy. Potassium addition decreased the amounts of both hydrogen adsorbed on the metal (site blocking) and the support hydroxyl groups. No evidence for a ruthenium-mediated (through-metal) electronic interaction between potassium species and adsorbed hydrogen was found. During catalyst preparation, potassium was incorporated on the support by an exchange with the Si(OH) groups forming Si(OK) species, thereby reducing the amount of surface silanol protons. The sequential impregnation technique proved to be more efficient in depositing potassium on the metal surface. (C) 1994 Academic Press, Inc. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP UNER, DO (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM ENGN,AMES,IA 50011, USA. RI Uner, Deniz/P-5819-2015 OI Uner, Deniz/0000-0001-8585-3691 NR 45 TC 34 Z9 34 U1 4 U2 9 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9517 J9 J CATAL JI J. Catal. PD APR PY 1994 VL 146 IS 2 BP 530 EP 536 DI 10.1006/jcat.1994.1091 PG 7 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA NA986 UT WOS:A1994NA98600021 ER PT J AU LIM, KH WHITING, WB SMITH, DH AF LIM, KH WHITING, WB SMITH, DH TI EXCESS-ENTHALPIES AND LIQUID-LIQUID EQUILIBRIUM PHASE COMPOSITIONS OF THE NONIONIC AMPHIPHILE 2-BUTOXYETHANOL AND WATER SO JOURNAL OF CHEMICAL AND ENGINEERING DATA LA English DT Article ID FLOW CALORIMETER; HIGH-PRESSURE; MIXTURES; TEMPERATURE; BEHAVIOR; SYSTEMS; CURVES AB The excess enthalpies, H(E), for mixtures of the nonionic amphiphile C4H9OC2H4OH + water were measured by isothermal flow calorimetry at atmospheric pressure and 10 temperatures over the temperature range T - T(lcst) = -0.1 to +32 K. (T(lcst) is the lower critical solution temperature.) The H(E) data are reported and compared to literature values. The phase boundaries between the single- and two-phase regions, determined from the H(E) data, are also reported and compared to data from the phase volume method and from the literature. C1 W VIRGINIA UNIV,DEPT CHEM ENGN,MORGANTOWN,WV 26506. US DOE,MORGANTOWN ENERGY TECHNOL CTR,MORGANTOWN,WV 26507. NR 34 TC 2 Z9 2 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0021-9568 J9 J CHEM ENG DATA JI J. Chem. Eng. Data PD APR PY 1994 VL 39 IS 2 BP 399 EP 403 DI 10.1021/je00014a048 PG 5 WC Thermodynamics; Chemistry, Multidisciplinary; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA NH509 UT WOS:A1994NH50900048 ER PT J AU ROCKWELL, DM HANSEN, T AF ROCKWELL, DM HANSEN, T TI SAMPLING AND ANALYZING AIR-POLLUTION - AN APPARATUS SUITABLE FOR USE IN SCHOOLS SO JOURNAL OF CHEMICAL EDUCATION LA English DT Article ID PARTICLES C1 LAWRENCE BERKELEY LAB,DIV ENGN,BERKELEY,CA 94720. RP ROCKWELL, DM (reprint author), MACOMB SR HIGH SCH,MACOMB,IL 61455, USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0021-9584 J9 J CHEM EDUC JI J. Chem. Educ. PD APR PY 1994 VL 71 IS 4 BP 318 EP 322 PG 5 WC Chemistry, Multidisciplinary; Education, Scientific Disciplines SC Chemistry; Education & Educational Research GA NJ545 UT WOS:A1994NJ54500022 ER PT J AU KNICKELBEIN, MB AF KNICKELBEIN, MB TI PHOTODISSOCIATION SPECTROSCOPY OF CU3, CU3AR, AND CU3KR SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID FLUORESCENCE EXCITATION SPECTRUM; COOLED COPPER TRIMER; GROUND-STATE; ELECTRONIC SPECTROSCOPY; VANDERWAALS COMPLEXES; OPTICAL SPECTROSCOPY; XENON ADSORPTION; GAS COMPLEXES; CLUSTER IONS; SURFACE AB The photodissociation spectra of the copper trimer and its argon and krypton adducts have been recorded in the visible. For Cu3, we observe a number of resolved vibronic transitions to the blue of the A <-- X origin at 539.8 nm in accord with the observations of Morse et al. [J. Chem. Phys. 79, 5316 (1983)]. By contrast, the spectra Of Cu3Ar and Cu3Kr consist of continuous absorption bands with maxima at 516 and 517 nm, respectively. While the oscillator strengths of the Cu3Ar and Cu3Kr absorption bands are nearly an order of magnitude larger than that derived for Cu3 from its photodissociation spectrum, they are in much closer agreement with the oscillator strength determined from the Cu3 A --> X radiative lifetime. RP KNICKELBEIN, MB (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 55 TC 30 Z9 30 U1 0 U2 11 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD APR 1 PY 1994 VL 100 IS 7 BP 4729 EP 4737 DI 10.1063/1.466263 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA ND254 UT WOS:A1994ND25400001 ER PT J AU WIEDMANN, RT WHITE, MG WANG, KH MCKOY, V AF WIEDMANN, RT WHITE, MG WANG, KH MCKOY, V TI ROTATIONALLY RESOLVED PHOTOIONIZATION OF POLYATOMIC HYDRIDES - CH3, H2O, H2S, H2CO SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID GAUSSIAN BASIS FUNCTIONS; FIRST-ROW ATOMS; ENHANCED MULTIPHOTON IONIZATION; NEAR-THRESHOLD PHOTOIONIZATION; ENERGY-PHOTOELECTRON-SPECTRUM; MOLECULAR CALCULATIONS; BASIS SETS; DIATOMIC-MOLECULES; SELECTION-RULES; CROSS-SECTIONS AB Combined theoretical and experimental studies of rotationally resolved photoelectron spectra for single-photon ionization of the outermost valence orbitals of H2O, H2S, H2CO, and CH3 are reported. Agreement between calculated and measured spectra is very encouraging. Both show that photoionization dynamics is very molecular in origin for H2O, H2S, and H2CO but quite atomiclike for CH3. Parity selection rules and the angular momentum composition of the photoelectron are used to illustrate the dynamical aspects of photoionization of polyatomics as molecular symmetry changes in a group of structurally related systems. C1 CALTECH,ARTHUR AMOS NOYES LAB CHEM PHYS,PASADENA,CA 91125. RP WIEDMANN, RT (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 41 TC 24 Z9 24 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD APR 1 PY 1994 VL 100 IS 7 BP 4738 EP 4746 DI 10.1063/1.466264 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA ND254 UT WOS:A1994ND25400002 ER PT J AU GREIS, JW ANGERHOFER, A NORRIS, JR SCHEER, H STRUCK, A VONSCHUTZ, JU AF GREIS, JW ANGERHOFER, A NORRIS, JR SCHEER, H STRUCK, A VONSCHUTZ, JU TI SPECTRAL DIFFUSION AND N-14 QUADRUPOLE SPLITTINGS IN ABSORPTION DETECTED MAGNETIC-RESONANCE HOLE-BURNING SPECTRA OF PHOTOSYNTHETIC REACTION CENTERS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID BACTERIUM RHODOPSEUDOMONAS-VIRIDIS; RHODOBACTER-SPHAEROIDES R-26; PHOTOINDUCED TRIPLET-STATE; ELECTRON-SPIN-RESONANCE; PRIMARY DONOR; ZERO-FIELD; RHODOSPIRILLUM-RUBRUM; DIFFERENCE SPECTRA; FLUORESCENCE-ODMR; ENERGY-TRANSFER AB Zero field absorption detected magnetic resonance hole burning measurements were performed on photosynthetic reaction centers of the bacteria Rhodobacter sphaeroides R26 and Rhodopseudomonas viridis. Extrapolation to zero microwave power yielded pseudohomogeneous linewidths of 2.0 MHz for Rhodopseudomonas viridis, 1.0 and 0.9 MHz for the protonated forms of Rhodobacter sphaeroides R26 with and without monomer bacteriochlorophyll exchanged, and 0.25 MHz as an upper limit for fully deuterated reaction centers of Rhodobacter sphaeroides R26. The measured linewidths were interpreted as being due to unresolved hyperfine interaction between the nuclear spins and the triplet electron spin, the line shape being determined by spectral diffusion among the nuclei. The difference in linewidths between Rhodobacter sphaeroides R26 and Rhodopseudomonas viridis is then explained by triplet delocalization on the special pair in the former, and localization on one dimer half on the latter. In the fully deuterated sample, four quadrupole satellites were observed in the hole spectra arising from the eight N-14 nitrogens in the special pair. The quadrupole parameters seem to be very similar for all nitrogens and were determined to kappa=1.25+/-0.1 MHz and eta=0.9+/-0.1 MHz. C1 UNIV STUTTGART,INST PHYS 3,D-70550 STUTTGART,GERMANY. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. UNIV MUNICH,INST BOT,D-80638 MUNICH,GERMANY. RI Angerhofer, Alexander/E-3143-2010 OI Angerhofer, Alexander/0000-0002-8580-6024 NR 62 TC 4 Z9 4 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 APR 1 PY 1994 VL 100 IS 7 BP 4820 EP 4827 DI 10.1063/1.467242 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA ND254 UT WOS:A1994ND25400011 ER PT J AU MA, ZX LIAO, CL NG, CY CHEUNG, YS LI, WK BAER, T AF MA, ZX LIAO, CL NG, CY CHEUNG, YS LI, WK BAER, T TI EXPERIMENTAL AND THEORETICAL-STUDIES OF ISOMERIC CH3S2 AND CH3S2(+) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ADIABATIC IONIZATION-ENERGY; IONS; PHOTODISSOCIATION; PHOTOIONIZATION; RELAXATION; CH3SSCH3; C2H5S+ AB By combining molecular beam photodissociation and photoionization measurements with ab initio Gaussian-2 (G2) calculations on the CH3S2 and CH3S2+ systems, we have shown that CH3SS is the dominant isomer formed in the photodissociation process, CH3SSCH3+hv(193 nm) -->CH3S2+CH3. The experimental ionization energy for CH3SS (8.97+/-0.02 eV) and the heat of formation at 0 K for CH3SS+ (217.7+/-1.2 kcal/mol) are in excellent agreement with the G2 results. The photoionization efficiency spectrum observed for CH3SS is also consistent with the theoretical prediction that the Franck-Condon factor for the photoionization process, CH3SS+hv -->CH3SS+ +e-, is not favorable. Based on the statistical modeling of experimental rates obtained previously for HS loss in the unimolecular decomposition of CH3SSCH3+ and the comparison with G2 ab initio predictions, we conclude that CH2SSH+ is most likely the isomer structure formed near the experimental appearance energy (11.07 eV) observed for the photodissociative ionization process, CH3SSCH3+hv-->CH3S2+CH3+e-. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. CHINESE UNIV HONG KONG,SHA TIN,HONG KONG. UNIV N CAROLINA,DEPT CHEM,CHAPEL HILL,NC 27599. RP MA, ZX (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 22 TC 36 Z9 36 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD APR 1 PY 1994 VL 100 IS 7 BP 4870 EP 4875 DI 10.1063/1.467277 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA ND254 UT WOS:A1994ND25400016 ER PT J AU YANG, CY KLIPPENSTEIN, SJ KRESS, JD PACK, RT PARKER, GA LAGANA, A AF YANG, CY KLIPPENSTEIN, SJ KRESS, JD PACK, RT PARKER, GA LAGANA, A TI COMPARISON OF TRANSITION-STATE THEORY WITH QUANTUM SCATTERING-THEORY FOR THE REACTION LI+HF-]LIF+H SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CUMULATIVE REACTION PROBABILITIES; POTENTIAL-ENERGY SURFACE; MECHANICAL REACTION PROBABILITIES; KASSEL-MARCUS THEORY; PHOTODETACHMENT SPECTRUM; REACTION COORDINATE; RATE CONSTANTS; BOND LENGTH; RRKM THEORY; DISSOCIATION AB The validity of transition state theory is examined for the bimolecular reaction of Li+HF-->LiF+H. Accurate three-dimensional quantum scattering theory calculations of the cumulative reaction probability are reported for energies ranging from threshold (0.255 eV) up to 0.600 eV and a total angular momentum J of 0. Transition state theory estimates of the effect of both the entrance and exit channels on the cumulative reaction probability are reported for the same energy range and J value. The transition state theory results are found to provide an accurate description of the smoothed energy dependence of the cumulative reaction probabilities with a maximum disagreement between the two calculations of about 25% arising at the highest energy considered of 0.6 eV C1 LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. UNIV OKLAHOMA, DEPT PHYS & ASTRON, NORMAN, OK 73019 USA. UNIV PERUGIA, DIPARTIMENTO CHIM, I-06100 PERUGIA, ITALY. RP YANG, CY (reprint author), CASE WESTERN RESERVE UNIV, DEPT CHEM, CLEVELAND, OH 44106 USA. RI Parker, Gregory/A-4327-2009; Lagana, Antonio/E-8215-2014; OI Parker, Gregory/0000-0002-0225-8887; Lagana, Antonio/0000-0002-3886-7342; Klippenstein, Stephen/0000-0001-6297-9187 NR 44 TC 15 Z9 15 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD APR 1 PY 1994 VL 100 IS 7 BP 4917 EP 4924 DI 10.1063/1.467211 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA ND254 UT WOS:A1994ND25400021 ER PT J AU FELLER, D GLENDENING, ED KENDALL, RA PETERSON, KA AF FELLER, D GLENDENING, ED KENDALL, RA PETERSON, KA TI AN EXTENDED BASIS-SET AB-INITIO STUDY OF LI+ (H2O)N, N=1-6 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CONFIGURATION-INTERACTION CALCULATIONS; CORRELATED MOLECULAR CALCULATIONS; GAUSSIAN-BASIS SETS; WAVE-FUNCTIONS; WATER DIMER; BENCHMARK CALCULATIONS; SYSTEMATIC SEQUENCES; ENERGY CALCULATIONS; DIATOMIC HYDRIDES; GAS-PHASE AB The structures, binding energies, and enthalpies of small molecular clusters incorporating a single lithium cation and up through six waters have been determined with extended Gaussian basis sets using Hartree-Fock and post-Hartree-Fock methods. The resulting properties are analyzed with respect to both basis set completeness and degree of correlation recovery, including core-core and core-valence effects. Although the lithium-water interaction is largely electrostatic in nature, small basis sets, lacking in polarization and near-valence diffuse functions, drastically overestimate the strength of the bond (by 20 kcal/mol or more) and underestimate the Li+...O distance by up to 0.1 angstrom. Their poor performance is attributable to inherent errors in describing the electric moments and polarizability of water and to large basis set superposition errors. Thus, the accuracy with which the fundamental lithium-water interaction could be modeled was primarily dependent on the quality of the Gaussian basis set and not upon the level of correlation recovery. Basis set enlargement and correlation effects both tend to reduce the strength of the Li+(H2O) bond, but produce corrections of opposite sign for the Li+...O bond length. Although correlation effects play a minor role in describing the lithium-water interaction, as the size of the cluster increases and the number of waters involved in multiple hydrogen bonds grows, correlation recovery can become significant. RP FELLER, D (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 43 TC 162 Z9 162 U1 1 U2 12 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD APR 1 PY 1994 VL 100 IS 7 BP 4981 EP 4997 DI 10.1063/1.467217 PG 17 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA ND254 UT WOS:A1994ND25400028 ER PT J AU GRAY, SK VEROSKY, JM AF GRAY, SK VEROSKY, JM TI CLASSICAL HAMILTONIAN STRUCTURES IN WAVE-PACKET DYNAMICS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID DEPENDENT SCHRODINGER-EQUATION; QUANTUM-MECHANICS; SEMICLASSICAL IMPLICATIONS; MOLECULAR-DYNAMICS; TIME EVOLUTION; BERRYS PHASE; FORMALDEHYDE; PROPAGATION; INTEGRATION; REPRESENTATION AB The general, N state matrix representation of the time-dependent Schrodinger equation is equivalent to an N degree of freedom classical Hamiltonian system. We describe how classical mechanical methods and ideas can be applied towards understanding and modeling exact quantum dynamics. Two applications are presented. First, we illustrate how qualitative insights may be gained by treating the two state problem with a time-dependent coupling. In the case of periodic coupling, Poincare surfaces of section are used to view the quantum dynamics, and features such as the Floquet modes take on interesting interpretations. The second application illustrates computational implications by showing how Liouville's theorem, or more generally the symplectic nature of classical Hamiltonian dynamics, provides a new perspective for carrying out numerical wave packet propagation. We show how certain simple and explicit symplectic integrators can be used to numerically propagate wave packets. The approach is illustrated with an application to the problem of a diatomic molecule interacting with a laser, although it and related approaches may be useful for describing a variety of problems. C1 WESTERN WASHINGTON UNIV, DEPT MATH, BELLINGHAM, WA 98225 USA. RP GRAY, SK (reprint author), ARGONNE NATL LAB, THEORET CHEM GRP, ARGONNE, IL 60439 USA. NR 80 TC 59 Z9 62 U1 1 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD APR 1 PY 1994 VL 100 IS 7 BP 5011 EP 5022 DI 10.1063/1.467219 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA ND254 UT WOS:A1994ND25400030 ER PT J AU DAWSON, SP LAWNICZAK, A KAPRAL, R AF DAWSON, SP LAWNICZAK, A KAPRAL, R TI INTERACTION OF TURING AND FLOW-INDUCED CHEMICAL INSTABILITIES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID DIFFERENTIAL FLOW; SYSTEMS; NOISE; OSCILLATIONS; PATTERNS; DYNAMICS; WAVES AB The interaction between the Turing instability and the instability induced by a differential flow is studied in the Selkov model. Both instabilities give rise to the formation of spatial patterns, and for a range of parameter values, these patterns can compete. The effect of anisotropic diffusion on the pattern formation process is investigated. Stripes with different orientations that travel with time and the suppression of patterns due to a competition of both instabilities are observed. C1 UNIV GUELPH,DEPT MATH & STAT,GUELPH N1G 2W1,ONTARIO,CANADA. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV TORONTO,DEPT CHEM,CHEM PHYS THEORY GRP,TORONTO M5S 1A1,ONTARIO,CANADA. RP DAWSON, SP (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. OI Ponce Dawson, Silvina/0000-0001-6550-4267 NR 25 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 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD APR 1 PY 1994 VL 100 IS 7 BP 5211 EP 5218 DI 10.1063/1.467185 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA ND254 UT WOS:A1994ND25400049 ER PT J AU CHAKARIAN, V SHUH, DK YARMOFF, JA TAO, HS DIEBOLD, U MASCHHOFF, BL MADEY, TE SHINN, ND AF CHAKARIAN, V SHUH, DK YARMOFF, JA TAO, HS DIEBOLD, U MASCHHOFF, BL MADEY, TE SHINN, ND TI THE INFLUENCE OF PREADSORBED K ON THE ADSORPTION OF PF3 ON RU(0001) STUDIED BY SOFT-X-RAY PHOTOELECTRON-SPECTROSCOPY SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ELECTRON-STIMULATED-DESORPTION; COORDINATION CHEMISTRY; POTASSIUM; PHOTOEMISSION; SURFACE; COADSORPTION; TEMPERATURE; AG(111); ENERGY; LAYER AB Soft-x-ray photoelectron spectroscopy (SXPS) is utilized to study the coadsorption of K and PF3 on Ru(0001) at 90 and 300 K. In the absence of K, PF3 adsorbs molecularly at both temperatures. In the presence of a fractional monolayer of K, initially PF3 completely dissociates resulting in the formation of adsorbed KF and P species. As the surface is further exposed to PF3, some of the PF3 molecules adsorb via partial dissociation, resulting in the formation of PF and PF2. This process continues until all the K has reacted. At 300 K, a fraction of the incoming PF3 molecules react with the adsorbed KF and form a species which is tentatively identified as KPF6. The data show that surface chemistry is different at the two temperatures, as some of the chemical reaction channels occurring at 300 K are blocked at 90 K. The reduced surface mobility of the incident PF3 molecules at 90 K adversely affects the probability of PF3 and KF interactions, which, in tum, causes the concentration of adsorbed PF3 relative to P to be larger at lower temperatures. C1 RUTGERS STATE UNIV,SURFACE MODIFICAT LAB,PISCATAWAY,NJ 08855. UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RUTGERS STATE UNIV,DEPT PHYS & ASTRON,PISCATAWAY,NJ 08855. SANDIA NATL LABS,DEPT SURFACE & INTERFACE SCI,ALBUQUERQUE,NM 87185. RI Diebold, Ulrike/A-3681-2010 OI Diebold, Ulrike/0000-0003-0319-5256 NR 41 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 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD APR 1 PY 1994 VL 100 IS 7 BP 5301 EP 5313 DI 10.1063/1.467195 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA ND254 UT WOS:A1994ND25400059 ER PT J AU SIMONSON, JM OAKES, CS BODNAR, RJ AF SIMONSON, JM OAKES, CS BODNAR, RJ TI DENSITIES OF NACL(AQ) TO THE TEMPERATURE 523-K AT PRESSURES TO 40 MPA MEASURED WITH A NEW VIBRATING-TUBE DENSITOMETER SO JOURNAL OF CHEMICAL THERMODYNAMICS LA English DT Article ID SODIUM-CHLORIDE SOLUTIONS; THERMODYNAMIC PROPERTIES; VOLUMETRIC PROPERTIES; FUNDAMENTAL EQUATION; MOLAR VOLUMES; WATER; MOL.KG-1; 350-DEGREES-C; 298.15-K; SYSTEM C1 VIRGINIA POLYTECH INST & STATE UNIV,DEPT GEOL SCI,BLACKSBURG,VA 24061. RP SIMONSON, JM (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831, USA. RI Bodnar, Robert/A-1916-2009 NR 18 TC 56 Z9 56 U1 1 U2 9 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0021-9614 J9 J CHEM THERMODYN JI J. Chem. Thermodyn. PD APR PY 1994 VL 26 IS 4 BP 345 EP 359 DI 10.1006/jcht.1994.1044 PG 15 WC Thermodynamics; Chemistry, Physical SC Thermodynamics; Chemistry GA NE609 UT WOS:A1994NE60900002 ER PT J AU SETTLE, JL GREENBERG, E HUBBARD, WN OHARE, PAG AF SETTLE, JL GREENBERG, E HUBBARD, WN OHARE, PAG TI THE STANDARD MOLAR ENTHALPY OF FORMATION OF LIQUID-HYDROGEN FLUORIDE DELTA(F)H(M)(DEGREES)(HF, L) AT THE TEMPERATURE 298.15-K DETERMINED BY DIRECT COMBINATION OF THE ELEMENTS IN A FLUORINE-BOMB CALORIMETER SO JOURNAL OF CHEMICAL THERMODYNAMICS LA English DT Article C1 NATL INST STAND & TECHNOL,DIV CHEM KINET & THERMODYNAM,GAITHERSBURG,MD 20899. ARGONNE NATL LAB,ARGONNE,IL 60439. NR 43 TC 1 Z9 1 U1 0 U2 1 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0021-9614 J9 J CHEM THERMODYN JI J. Chem. Thermodyn. PD APR PY 1994 VL 26 IS 4 BP 435 EP 448 DI 10.1006/jcht.1994.1053 PG 14 WC Thermodynamics; Chemistry, Physical SC Thermodynamics; Chemistry GA NE609 UT WOS:A1994NE60900011 ER PT J AU DIPESO, G HEWETT, DW SIMONSON, GF AF DIPESO, G HEWETT, DW SIMONSON, GF TI EXTENSION OF THE STREAMLINED DARWIN MODEL TO QUASI-NEUTRAL PLASMAS SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID FIELD-EQUATIONS; SIMULATION AB The finite electron mass streamlined Darwin field (SDF) model is derived for a quasineutral plasma and contrasted to the SDF model for a nonneutral plasma. Because the Darwin model is used, the Courant numerical stability condition c DELTAt/DELTAx < 1 is avoided. In a quasineutral plasma, the omega(pe)DELTAt< 2 stability condition and the DELTAx/lambda(De) < 1 accuracy condition are avoided by the use of a quasineutral Poisson equation. A fast coupled-elliptic solution technique, found to work extremely well with the nonneutral SDF model, also works well with the quasineutral SDF model. Because of the similarity of the field equations for a non-neutral and a quasineutral plasma, it may be possible to simulate a plasma with both nonneutral and quasineutral regions using a single SDF solver. (C) 1994 Academic Press, Inc. C1 LAWRENCE LIVERMORE NATL LAB,DIV D,LIVERMORE,CA 94550. RP DIPESO, G (reprint author), LAWRENCE LIVERMORE NATL LAB,INST PLASMA PHYS,LIVERMORE,CA 94550, USA. NR 14 TC 6 Z9 6 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD APR PY 1994 VL 111 IS 2 BP 237 EP 247 DI 10.1006/jcph.1994.1058 PG 11 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA NK226 UT WOS:A1994NK22600003 ER PT J AU RUSSO, G STRAIN, JA AF RUSSO, G STRAIN, JA TI FAST TRIANGULATED VORTEX METHODS FOR THE 2D-EULER EQUATIONS SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID DELAUNAY TRIANGULATION; EULERS EQUATIONS; POTENTIAL-THEORY; 3 DIMENSIONS; CONVERGENCE; ALGORITHM; ACCURACY AB Vortex methods for inviscid incompressible two-dimensional fluid flow are usually based on blob approximations. This paper presents a vortex method in which the vorticity is approximated by a piecewise polynomial interpolant on a Delaunay triangulation of the vortices. An efficient reconstruction of the Delaunay triangulation at each step makes the method accurate for long times. The vertices of the triangulation move with the fluid velocity, which is reconstructed from the vorticity via a simplified fast multipole method for the Biot-Savart law with a continuous source distribution. The initial distribution of vortices is constructed from the initial vorticity field by an adaptive approximation method which produces good accuracy even for discontinuous initial data. Numerical results show that the method is highly accurate over long time intervals. Experiments with single and multiple circular and elliptical rotating patches of both piecewise constant and smooth vorticity indicate that the method produces much smaller errors than blob methods with the same number of degrees of freedom, at little additional cost. Generalizations to domains with boundaries, viscous flow, and three space dimensions are discussed. (C) 1994 Academic Press, Inc. C1 UNIV CALIF BERKELEY,DEPT MATH,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP RUSSO, G (reprint author), UNIV AQUILA,DIPARTIMENTO MATEMAT,VIA VETOIO,I-67010 LAQUILA,ITALY. RI Russo, Giovanni/B-7097-2016 OI Russo, Giovanni/0000-0003-4215-1926 NR 52 TC 17 Z9 17 U1 0 U2 4 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD APR PY 1994 VL 111 IS 2 BP 291 EP 323 DI 10.1006/jcph.1994.1065 PG 33 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA NK226 UT WOS:A1994NK22600010 ER PT J AU CARY, JW AF CARY, JW TI ESTIMATING THE SURFACE-AREA OF FLUID-PHASE INTERFACES IN POROUS-MEDIA SO JOURNAL OF CONTAMINANT HYDROLOGY LA English DT Article ID SOILS AB An equation is derived to calculate the specific interfacial area of any two continuous immiscible fluids contained in a porous medium. Use of the equation requires the volume fraction of fluids, a capillary water retention relation and the specific solid surface area of the porous medium of interest. Calculations of the air-water interfacial area as a function of volumetric water content are presented for a hypothetical sand, silt loam and clay soil. These values are compared to those calculated from two other equations that have been proposed in the literature. The method presented here is novel in that it is based on the area of continuous liquid films covering the solid phase matrix and so includes both convex and concave curvatures. It also is developed such that it converges to the correct known areas at total saturation and at monolayer coverage of the solid matrix. RP CARY, JW (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 8 TC 61 Z9 62 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-7722 J9 J CONTAM HYDROL JI J. Contam. Hydrol. PD APR PY 1994 VL 15 IS 4 BP 243 EP 248 DI 10.1016/0169-7722(94)90029-9 PG 6 WC Environmental Sciences; Geosciences, Multidisciplinary; Water Resources SC Environmental Sciences & Ecology; Geology; Water Resources GA NH900 UT WOS:A1994NH90000001 ER PT J AU SZECSODY, JE BROCKMAN, FJ WOOD, BD STREILE, GP TRUEX, MJ AF SZECSODY, JE BROCKMAN, FJ WOOD, BD STREILE, GP TRUEX, MJ TI TRANSPORT AND BIODEGRADATION OF QUINOLINE IN HORIZONTALLY STRATIFIED POROUS-MEDIA SO JOURNAL OF CONTAMINANT HYDROLOGY LA English DT Article ID INSITU BIORESTORATION; SOLUTE TRANSPORT; COASTAL-PLAIN; CHLORINATED ALIPHATICS; SUBSURFACE SEDIMENTS; MICROBIAL-METABOLISM; PSEUDOMONAS-PUTIDA; DEGRADING BACTERIA; MODEL SIMULATIONS; DEGRADATION AB An experimental study of the movement and biodegradation of quinoline was conducted in a saturated, 2-layer system (1 m long) to identify processes that may result in increased microbial growth at hydraulic layer interfaces. The system contained two layers of contrasting hydraulic conductivity (1:12) and flow was parallel to layers. Tracer breakthrough, used to quantify interlayer mass transfer, showed that the transverse dispersivity was 0.3 cm near the interface and 0.036cm within the low-conductivity (low-K) layer. Interlayer mass transfer resulted in arrival of substrate (quinoline) and oxygen 10's to 100's of hours sooner in the low-K layer near the interface compared to other locations within the low-K layer where substrates arrived via only advection. Early arrival of substrates near the interface resulted in biodegradation of quinoline for a longer period than within layers, yielding increased growth in a 1- to 3-cm-thick zone, as measured by plate counts. Because biodegradation was oxygen limited in this system, microbial growth at all locations was small [log(maximum increase) less-than-or-equal-to 1.0] and measured porous-medium hydraulic properties (dispersion, hydraulic gradient) were not affected by the biomass production. Although the thickness of the effected interface zone was small in this system, the effect on the overall transport of quinoline was significant; 19% of the growth (and corresponding degradation of substrates) in the low-K layer was in the relatively small interface zone. The effect of microbial biomass production at interfaces on overall solute movement is likely to be maximized in environments that have a high density of hydraulic or geochemical interfaces, particularly in settings where the interfaces serve as mixing zones between nutrient-limited waters. RP SZECSODY, JE (reprint author), PACIFIC NW LAB, DEPT GEOSCI, RICHLAND, WA 99352 USA. RI Wood, Brian/K-4025-2012; Wood, Brian/J-8362-2013 OI Wood, Brian/0000-0003-3152-7852; Wood, Brian/0000-0003-3152-7852 NR 58 TC 16 Z9 16 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-7722 J9 J CONTAM HYDROL JI J. Contam. Hydrol. PD APR PY 1994 VL 15 IS 4 BP 277 EP 304 DI 10.1016/0169-7722(94)90031-0 PG 28 WC Environmental Sciences; Geosciences, Multidisciplinary; Water Resources SC Environmental Sciences & Ecology; Geology; Water Resources GA NH900 UT WOS:A1994NH90000003 ER PT J AU WOLK, JA AGER, JW DUXSTAD, KJ WALUKIEWICZ, W HALLER, EE TASKAR, NR DORMAN, DR OLEGA, DJ AF WOLK, JA AGER, JW DUXSTAD, KJ WALUKIEWICZ, W HALLER, EE TASKAR, NR DORMAN, DR OLEGA, DJ TI THE NITROGEN-HYDROGEN COMPLEX IN ZNSE SO JOURNAL OF CRYSTAL GROWTH LA English DT Editorial Material C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,BERKELEY,CA 94720. PHILIPS LABS,BRIARCLIFF MANOR,NY 10510. NR 2 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD APR PY 1994 VL 138 IS 1-4 BP 1071 EP 1072 DI 10.1016/0022-0248(94)90958-X PG 2 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA NN997 UT WOS:A1994NN99700190 ER PT J AU PARK, Y SKOWRONSKI, M ROSSEEL, TM AF PARK, Y SKOWRONSKI, M ROSSEEL, TM TI INCORPORATION OF ALUMINUM AND OXYGEN IN DIMETHYLALUMINUM METHOXIDE DOPED GAAS DURING ORGANOMETALLIC VAPOR-PHASE EPITAXY SO JOURNAL OF CRYSTAL GROWTH LA English DT Article ID MOLECULAR-BEAM EPITAXY; ALXGA1-XAS LAYERS; GALLIUM-ARSENIDE; ALGAAS; GROWTH; SPECTROSCOPY; LEVEL; MOCVD; MOVPE; PRESSURE AB Dimethylaluminum methoxide (DMAlMO) was used as a deep level dopant source in GaAs epilayers grown by organometallic vapor phase epitaxy (OMVPE). The compound is stable, does not exhibit gas phase reactions in all investigated deposition conditions, and does not degrade surface morphology even at doping levels in excess of 10(19) cm-3. Incorporation of aluminum and oxygen into the epilayer was studied by secondary ion mass spectroscopy (SIMS) on multi-layered samples as a function of growth conditions: growth temperature, reactor pressure, dopant mole fraction in the gas phase, and growth rate. Both oxygen and aluminum are incorporated during deposition with oxygen concentration always lower but approaching that of aluminum at temperatures below 500-degrees-C. At higher growth temperatures, [O]/[Al] ratio decreases exponentially with activation energy of 2.0 eV. Incorporation of oxygen exhibits superlinear behavior at higher DMAlMO mole fractions. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP PARK, Y (reprint author), CARNEGIE MELLON UNIV,DEPT MAT SCI & ENGN,PITTSBURGH,PA 15213, USA. RI Skowronski, Marek/A-8934-2011; Rosseel, Thomas/J-4086-2016 OI Skowronski, Marek/0000-0002-2087-0068; Rosseel, Thomas/0000-0001-9917-7073 NR 37 TC 4 Z9 4 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD APR PY 1994 VL 137 IS 3-4 BP 442 EP 451 DI 10.1016/0022-0248(94)90983-0 PG 10 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA NE892 UT WOS:A1994NE89200017 ER PT J AU NATESAN, K AF NATESAN, K TI MATERIALS PERFORMANCE IN ADVANCED COMBUSTION SYSTEMS SO JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME LA English DT Article; Proceedings Paper CT 38th International Gas Turbine and Aeroengine Congress and Exposition CY MAY 24-27, 1993 CL CINCINNATI, OH SP INT GAS TURBINE INST AB A number of advanced technologies are being developed to convert coal into clean fuels for use as feedstock in chemical plants and for power generation. From the standpoint of component materials, the environments created by coal conversion and combustion in these technologies and their interactions with materials are of interest. The trend in the new or advanced systems is to improve thermal efficiency and reduce the environmental impact of the process effluents. This paper discusses several systems that are under development and identifies requirements for materials application in those systems. Available data on the performance of materials in several of the environments are used to examine the performance envelopes for materials for several of the systems and to identify needs for additional work in different areas. RP NATESAN, K (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. NR 20 TC 1 Z9 1 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0742-4795 J9 J ENG GAS TURB POWER JI J. Eng. Gas. Turbines Power-Trans. ASME PD APR PY 1994 VL 116 IS 2 BP 331 EP 337 DI 10.1115/1.2906824 PG 7 WC Engineering, Mechanical SC Engineering GA NJ136 UT WOS:A1994NJ13600008 ER PT J AU ROBERTSON, A BONK, D AF ROBERTSON, A BONK, D TI EFFECT OF PRESSURE ON 2ND-GENERATION PRESSURIZED FLUIDIZED-BED COMBUSTION PLANTS SO JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME LA English DT Article; Proceedings Paper CT 38th International Gas Turbine and Aeroengine Congress and Exposition CY MAY 24-27, 1993 CL CINCINNATI, OH SP INT GAS TURBINE INST AB In the search for a more efficient, less costly, and more environmentally responsible method for generating electrical power from coal, research and development has turned to advanced pressurized fluidized bed combustion (PFBC) and coal gasification technologies. A logical extension of this work is the second-generation PFBC plant, which incorporates key components of each of these technologies. In this new type of plant, coal is devolatilized/carbonized before it is injected into the PFB combustor bed, and the low-Btu fuel gas produced by this process is burned in a gas turbine topping combustor. By integrating coal carbonization with PFB coal/char combustion, gas turbine inlet temperatures higher than 1149-degrees-C (2100-degrees-F) can be achieved. The carbonizer, PFB combustor, and particulate-capturing hot gas cleanup systems operate at 871-degrees-C (1600-degrees-F), permitting sulfur capture by lime-based sorbents and minimizing the release of coal contaminants to the gases. This paper presents the performance and economics of this new type of plant and provides a brief overview of the pilot plant test programs being conducted to support its development. C1 US DOE,MORGANTOWN,WV 26507. RP ROBERTSON, A (reprint author), FOSTER WHEELER DEV CORP,LIVINGSTON,NJ 07039, USA. NR 3 TC 3 Z9 3 U1 1 U2 3 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0742-4795 J9 J ENG GAS TURB POWER JI J. Eng. Gas. Turbines Power-Trans. ASME PD APR PY 1994 VL 116 IS 2 BP 345 EP 351 DI 10.1115/1.2906826 PG 7 WC Engineering, Mechanical SC Engineering GA NJ136 UT WOS:A1994NJ13600010 ER PT J AU SWINDEMAN, RW MARRIOTT, DL AF SWINDEMAN, RW MARRIOTT, DL TI CRITERIA FOR DESIGN WITH STRUCTURAL-MATERIALS IN COMBINED-CYCLE APPLICATIONS ABOVE 815-DEGREES-F SO JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME LA English DT Article; Proceedings Paper CT 38th International Gas Turbine and Aeroengine Congress and Exposition CY MAY 24-27, 1993 CL CINCINNATI, OH SP INT GAS TURBINE INST AB A number of materials issues related to the design of piping and support components in high-temperature fluidized bed combustor systems were examined. These issues included the availability of long-time design data on structural materials, the general character of the creep and stress rupture behavior, the performance of weldments, and the assessment of damage accumulation. Emphasis was placed on alloy 800H, but several other alloys were briefly examined for use at temperatures above 816-degrees-C (1500-degrees-F). It was concluded that the character of the creep curve ranged significantly with chemistry, processing variables, and environment, and that the specification of design allowable stresses and life estimation techniques must be approached with caution for service above 816-degrees-C (1500-degrees-F). C1 STRESS ENGN SERV,CINCINNATI,OH 45246. RP SWINDEMAN, RW (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 40 TC 0 Z9 0 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0742-4795 J9 J ENG GAS TURB POWER JI J. Eng. Gas. Turbines Power-Trans. ASME PD APR PY 1994 VL 116 IS 2 BP 352 EP 359 DI 10.1115/1.2906827 PG 8 WC Engineering, Mechanical SC Engineering GA NJ136 UT WOS:A1994NJ13600011 ER PT J AU DUNN, ML AF DUNN, ML TI THERMALLY-INDUCED FIELDS IN ELECTROELASTIC COMPOSITE-MATERIALS - AVERAGE FIELDS AND EFFECTIVE BEHAVIOR SO JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article ID PIEZOELECTRIC COMPOSITES; HETEROGENEOUS MEDIA; POLYMER COMPOSITES; UNIFORM-FIELDS; PZT AB The average thermally induced electroelastic fields and the effective thermal expansion and pyroelectric coefficients of two-phase composite materials are obtained by applying the Mori-Tanaka mean-field theory to the coupled response of electroelastic composites through a field superposition scheme. Results are obtained for composites reinforced by ellipsoidal piezoelectric and pyroelectric inhomogeneities and thus are applicable to a wide range of microstructural geometry including lamina, spherical particle, and continuous fiber reinforcement. The results are shown to obey the recently derived Levin-type equations relating the effective thermal expansion and pyroelectric coefficients of a two-phase composite to those of the constituents and the electroelastic moduli of the constituents and the composite. The analysis is developed in a matrix formulation convenient for numerical computation in which the electroelastic (elastic, piezoelectric, and dielectric) moduli are represented by a 9 x 9 matrix and the thermal expansion and pyroelectric coefficients by a 9 x 1 column vector. A limited parametric study is performed to illustrate the interesting behavior exhibited by some typical composite microstructures. Finally, analytical predictions are examined in light of existing experimental observations. RP DUNN, ML (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. OI DUNN, MARTIN/0000-0002-4531-9176 NR 31 TC 3 Z9 3 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0094-4289 J9 J ENG MATER-T ASME JI J. Eng. Mater. Technol.-Trans. ASME PD APR PY 1994 VL 116 IS 2 BP 200 EP 207 DI 10.1115/1.2904274 PG 8 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA NH491 UT WOS:A1994NH49100011 ER PT J AU PHILLIPS, CC HAMILTON, CB AF PHILLIPS, CC HAMILTON, CB TI A PRELIMINARY ASSESSMENT OF ASBESTOS AWARENESS AND CONTROL MEASURES IN BRAKE AND CLUTCH REPAIR SERVICES IN KNOXVILLE AND KNOX COUNTY, TENNESSEE SO JOURNAL OF ENVIRONMENTAL HEALTH LA English DT Article AB The pending OSHA standard revision proposed in 1990 to lower the asbestos Permissible Exposure Limit (PEL) and to mandate effective asbestos control measures (ACM) in brake and clutch assembly work may have a profound effect on industries involved in such operations. Health protection of workers will be improved and costs of improved control methods and training will increase. Considering these facts, this preliminary study was designed to assess the level of worker and management awareness of asbestos hazards associated with brake and clutch repair and to determine what ACM-had been implemented by businesses in Knoxville and Knox County, Tennessee. The study, in a metropolitan area of approximately 336,000 people, revealed eight different categories of businesses conducting brake and clutch repair work with an estimated 363 potentially exposed employees. Results of the study suggest that managers and employees of the 80 businesses studied were in need of asbestos hazard awareness training and more adequate asbestos control measures. RP PHILLIPS, CC (reprint author), MARTIN MARIETTA ENERGY SYST INC,OAK RIDGE NATL LAB,IND HYG SECT,POB 2008,OAK RIDGE,TN 37831, USA. NR 0 TC 1 Z9 1 U1 1 U2 1 PU NATL ENVIRON HEALTH ASSN PI DENVER PA 720 S COLORADO BLVD SUITE 970, SOUTH TOWER, DENVER, CO 80222 SN 0022-0892 J9 J ENVIRON HEALTH JI J. Environ. Health PD APR PY 1994 VL 56 IS 8 BP 7 EP 12 PG 6 WC Environmental Sciences; Public, Environmental & Occupational Health SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health GA ND821 UT WOS:A1994ND82100002 ER PT J AU LEE, RG FLAMM, R GOTTFRIED, RR NAIMAN, RJ TURNER, M WEAR, DN AF LEE, RG FLAMM, R GOTTFRIED, RR NAIMAN, RJ TURNER, M WEAR, DN TI A HOLISTIC APPROACH TO LANDSCAPE MANAGEMENT SO JOURNAL OF FORESTRY LA English DT Editorial Material C1 FLORIDA MARINE RES INST,ST PETERSBURG,FL. UNIV SOUTH,SEWANEE,TN 37375. UNIV WASHINGTON,CTR STREAMSIDE STUDIES,SEATTLE,WA 98195. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. US FOREST SERV,RES TRIANGLE PK,NC. RP LEE, RG (reprint author), UNIV WASHINGTON,COLL FOREST RESOURCES,SEATTLE,WA 98195, USA. RI Naiman, Robert /K-3113-2012 NR 4 TC 0 Z9 0 U1 0 U2 0 PU SOC AMER FORESTERS PI BETHESDA PA 5400 GROSVENOR LANE, BETHESDA, MD 20814 SN 0022-1201 J9 J FOREST JI J. For. PD APR PY 1994 VL 92 IS 4 BP 51 EP 51 PG 1 WC Forestry SC Forestry GA ND815 UT WOS:A1994ND81500032 ER PT J AU BIRN, J HESSE, M AF BIRN, J HESSE, M TI INFLUENCE OF PLASMA SHEET THICKENING TOWARD THE TAIL FLANKS ON MAGNETOTAIL STABILITY AND DYNAMICS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID GEOMAGNETIC TAIL; RECONNECTION; EQUILIBRIA; MECHANISM AB On the basis of resistive MHD simulations we investigate the stability and dynamic evolution of the magnetotail for configurations with various degrees of plasma sheet thickening from midnight toward the tail flanks, associated with a similar increase of the B(z) component. This increase is varied by factors between 2 and 3.5, while the magnitude of B(z) at midnight is left unchanged. The increase of B(z) has a strong effect on the spatial extent of resistive tearing and reconnection across the tail and on the unstable evolution. For stronger thickening the cross-tail extent of the near-Earth neutral line, formed by reconnection, and correspondingly the amount of reconnected magnetic flux get reduced and the dipolarization effects earthward of the neutral line are more concentrated near midnight. An increase of B(z) from midnight toward the flanks by more than a factor of about 3 can possibly even suppress the resistive tearing instability. This indicates the possibility of a stability transition due to a reduction of B(z) in the flank regions in response to changes in the solar wind, even when the magnitude of B(z) near midnight and the fluctuation level in that region are unchanged (provided that a sufficient fluctuation level exists). C1 NASA,GODDARD SPACE FLIGHT CTR,ELECTRODYNAM BRANCH,GREENBELT,MD 20771. RP BIRN, J (reprint author), LOS ALAMOS NATL LAB,SPACE & ATMOSPHER SCI GRP,MS D466,LOS ALAMOS,NM 87545, USA. RI Hesse, Michael/D-2031-2012 NR 12 TC 6 Z9 6 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD APR 1 PY 1994 VL 99 IS A4 BP 5847 EP 5853 DI 10.1029/93JA03568 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NF580 UT WOS:A1994NF58000014 ER PT J AU HAWKINS, JG LEE, LC YAN, M LIN, Y PERKINS, FW YAMADA, M AF HAWKINS, JG LEE, LC YAN, M LIN, Y PERKINS, FW YAMADA, M TI A MECHANISM TO PRODUCE A DAWN-DUSK COMPONENT OF PLASMA-FLOW DURING MAGNETIC RECONNECTION IN THE MAGNETOTAIL SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID MHD INTERMEDIATE SHOCKS; RESISTIVE MHD; SHEET AB Magnetic reconnection between antiparallel field lines in the magnetotail is generally thought to produce plasma acceleration in the earthward-tailward direction. However, measurements of the plasma velocity in the magnetotail during substorm activity sometimes reveal a dawn-dusk component of plasma flow. In this paper, we show that a dawn-dusk component of plasma acceleration may be produced during reconnection if the neutral line is not perpendicular to the magnetic field. In this case, MHD simulations show that reconnection between antiparallel field lines will initially produce plasma acceleration that is nearly parallel to the neutral line because the magnetic tension force is not opposed by a pressure gradient force in this direction. As the magnetic field topology evolves to a steady state, the plasma flow direction rotates until it is nearly parallel to the plane that initially contained the antiparallel magnetic field lines before reconnection (hereafter referred to as the initial field plane). However, the time required to reach a steady state (typically several hundred seconds in the magnetotail region) may be greater than the time during which the reconnection process is active. Consequently, bursts of plasma flow with a dawn-dusk component may occur in the magnetotail. The initial acceleration along the neutral line depends on the angle (theta(B)) between the neutral line and the initial field plane, with the largest burst of plasma flow along the neutral line occurring when theta(B) = 45-degrees. C1 UNIV ALASKA,INST GEOPHYS,FAIRBANKS,AK 99775. PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP HAWKINS, JG (reprint author), UNIV ALASKA,DEPT ELECT ENGN,FAIRBANKS,AK 99775, USA. RI Lee, Lou-Chuang/I-2588-2013 OI Lee, Lou-Chuang/0000-0003-4012-991X NR 11 TC 3 Z9 3 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD APR 1 PY 1994 VL 99 IS A4 BP 5869 EP 5875 DI 10.1029/93JA02269 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NF580 UT WOS:A1994NF58000016 ER PT J AU ANDERSON, BJ FUSELIER, SA GARY, SP DENTON, RE AF ANDERSON, BJ FUSELIER, SA GARY, SP DENTON, RE TI MAGNETIC SPECTRAL SIGNATURES IN THE EARTHS MAGNETOSHEATH AND PLASMA DEPLETION LAYER SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID CYCLOTRON ANISOTROPY INSTABILITIES; SUBSOLAR MAGNETOSHEATH; MAGNETOPAUSE; WAVES; IONS; MIRROR; SIMULATIONS; PULSATIONS; SHOCKS AB Correlations between plasma properties and magnetic fluctuations in the subsolar magnetosheath downstream of a quasi-perpendicular shock have been found and indicate that mirror and ion cyclotronlike fluctuations correlate with the magnetosheath proper and plasma depletion layer, respectively (Anderson and Fuselier, 1993). We explore the entire range of magnetic spectral signatures observed from the AMPTE/CCE spacecraft in the magnetosheath downstream of a quasi-perpendicular shock. The magnetic spectral signatures typically progress from predominantly compressional fluctuations, deltaB(parallel-to )/deltaB(perpendicular) almost-equal-to 3, with < 0.2 (F and F(p) are the wave frequency and proton gyrofrequency, respectively) to predominantly transverse fluctuations, deltaB(parallel)/deltaB(perpendicular) almost-equal-to 0.3, extending up to F(p). The compressional fluctuations are characterized by anticorrelation between the field magnitude and electron density, n(e), and by a small compressibility, C(e) = (deltan(e)/n(e))2(B/deltaB(parallel))2 almost-equal-to 0.13, indicative of mirror waves. The spectral characteristics of the transverse fluctuations are in agreement with predictions of linear Vlasov theory for the H+ and He2+ cyclotron modes. The power spectra and local plasma parameters are found to vary in concert: mirror waves occur for beta (parallel-to)p (beta(parallel-to)p = 2mu0n(p)kT(parallel-to)p/B2) almost-equal-to 2, A(p) = T (perpendicular-to)p/T(parallel-to)p - 1 almost-equal-to 0.4, whereas cyclotron waves occur for beta(parallel-to)p almost-equal-to 0.2 and A(p) almost-equal-to 2. The transition from mirror to cyclotron modes is predicted by linear theory. The spectral characteristics overlap for intermediate plasma parameters. The plasma observations are described by A(p) = 0.85beta(parallel-to)p -0.48 with a log regression coefficient of -0.74. This inverse A(p) - beta(parallel-to)p correlation corresponds closely to the isocontours of maximum ion anisotropy instability growth, gamma(m)/OMEGA(p) = 0.01, for the mirror and cyclotron modes. The agreement of observed properties and predictions of local theory suggests that the spectral signatures reflect the local plasma environment and that the anisotropy instabilities regulate A(p). We suggest that the spectral characteristics may provide a useful basis for ordering observations in the magnetosheath and that the A(p) - beta(parallel-to)p inverse correlation may be used as a beta-dependent upper limit on the proton anisotropy to represent kinetic effects. C1 DARTMOUTH COLL,HANOVER,NH 03755. LOCKHEED PALO ALTO RES LABS,PALO ALTO,CA 94304. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP ANDERSON, BJ (reprint author), JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20723, USA. RI Anderson, Brian/I-8615-2012 NR 32 TC 173 Z9 175 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD APR 1 PY 1994 VL 99 IS A4 BP 5877 EP 5891 DI 10.1029/93JA02827 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NF580 UT WOS:A1994NF58000017 ER PT J AU DENTON, RE GARY, SP ANDERSON, BJ FUSELIER, SA HUDSON, MK AF DENTON, RE GARY, SP ANDERSON, BJ FUSELIER, SA HUDSON, MK TI LOW-FREQUENCY MAGNETIC FLUCTUATION SPECTRA IN THE MAGNETOSHEATH AND PLASMA DEPLETION LAYER SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID CYCLOTRON ANISOTROPY INSTABILITIES; EARTHS BOW SHOCK; ION-CYCLOTRON; SUBSOLAR MAGNETOSHEATH; WAVES; MIRROR; SIMULATIONS; HE-2+ AB Recent observations have delineated several different kinds of enhanced magnetic fluctuation spectra below the proton cyclotron frequency in the terrestrial magnetosheath. A model is presented that represents the variation of plasma parameters across the plasma depletion layer and into the magnetosheath proper. Using this model, we find that many of the properties of the observed spectra follow directly from the predictions of linear Vlasov instability theory. The observed progression of spectral features is a natural progression from mirror mode to merged (in frequency range) proton and He2+ cyclotron modes to bifurcated (in frequency range) cyclotron modes as plasma convects earthward in the magnetosheath. The necessary change in dispersion surface topology from separated proton and He2+ cyclotron surfaces at low beta to merged surfaces at high beta is described. C1 LOCKHEED PALO ALTO RES LABS,PALO ALTO,CA 94304. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20723. RP DENTON, RE (reprint author), DARTMOUTH COLL,DEPT PHYS & ASTRON,HANOVER,NH 03755, USA. RI Anderson, Brian/I-8615-2012 NR 25 TC 31 Z9 31 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD APR 1 PY 1994 VL 99 IS A4 BP 5893 EP 5901 DI 10.1029/93JA02729 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NF580 UT WOS:A1994NF58000018 ER PT J AU GARY, SP MCKEAN, ME WINSKE, D ANDERSON, BJ DENTON, RE FUSELIER, SA AF GARY, SP MCKEAN, ME WINSKE, D ANDERSON, BJ DENTON, RE FUSELIER, SA TI THE PROTON CYCLOTRON INSTABILITY AND THE ANISOTROPY BETA-INVERSE CORRELATION SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID PLASMA DEPLETION LAYER; PERPENDICULAR BOW SHOCK; SUBSOLAR MAGNETOPAUSE; MIRROR WAVES; MAGNETOSHEATH; SIMULATIONS; PARAMETERS; PRESSURE; IONS AB Spacecraft observations in the strongly compressed subsolar magnetosheath show an inverse correlation between the proton temperature anistropy (T (perpendicular-to p)/T (parallel-to)p > 1 where perpendicular-to and parallel-to denote directions perpendicular and parallel to the background magnetic field) and the parallel proton beta (beta (parallel-to) p). This manuscript uses one-dimensional hybrid simulations of the proton cyclotron anisotropy instability in homogeneous electron-proton plasmas to study this correlation which may represent a limited closure relation for fluid theories of anisotropic space plasmas. The emphasis is on driven simulations which increase the temperature anisotropy by periodically reducing the magnetic-field-aligned velocities of the protons. The late-time states from ensembles of both initial value and driven simulations yield very similar expressions for the proton anisotropy/beta (parallel-to p) inverse correlation, and provide a basis for explaining differences between sheath observations from different spacecraft. The driven simulations also yield expressions for the maximum instability growth rate and the fluctuating field energy as functions of beta(parallel-to)p and a parameter characterizing the anisotropy driver. C1 DARTMOUTH COLL,DEPT PHYS & ASTRON,HANOVER,NH 03755. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP GARY, SP (reprint author), LOCKHEED PALO ALTO RES LABS,DEPT 91-20,BLDG 225,3251 HANNOVER ST,PALO ALTO,CA 94304, USA. RI Anderson, Brian/I-8615-2012 NR 47 TC 94 Z9 96 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD APR 1 PY 1994 VL 99 IS A4 BP 5903 EP 5914 DI 10.1029/93JA03583 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NF580 UT WOS:A1994NF58000019 ER PT J AU GARY, SP CONVERY, PD DENTON, RE FUSELIER, SA ANDERSON, BJ AF GARY, SP CONVERY, PD DENTON, RE FUSELIER, SA ANDERSON, BJ TI PROTON AND HELIUM CYCLOTRON ANISOTROPY INSTABILITY THRESHOLDS IN THE MAGNETOSHEATH SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID PLASMA DEPLETION LAYER; SUBSOLAR MAGNETOSHEATH; MIRROR WAVES; ION; SIMULATIONS AB Both the protons and the helium ions of the terrestrial magnetosheath typically display T(perpendicular-to) > T(parallel-to), where perpendicular-to and parallel-to denote directions perpendicular and parallel to the back-ground magnetic field. Observations of the highly compressed magnetosheath show an inverse correlation between these ion temperature anisotropies and the parallel proton beta. Computer simulations have demonstrated that these correlations are due to wave-particle scattering by electromagnetic ion cyclotron anisotropy instabilities. These correlations correspond to linear theory thresholds of the proton cyclotron and the helium cyclotron instabilities. This paper uses linear Vlasov theory and the assumption of a constant maximum growth rate to obtain closed-from expressions for these thresholds as a function of the relative helium density and the parallel proton beta in a parameter model of the magnetosheath. C1 JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20723. DARTMOUTH COLL,DEPT PHYS & ASTRON,HANOVER,NH 03755. LOCKHEED PALO ALTO RES LABS,PALO ALTO,CA 94304. RP GARY, SP (reprint author), LOS ALAMOS NATL LAB,MS D466,LOS ALAMOS,NM 87545, USA. RI Anderson, Brian/I-8615-2012 NR 22 TC 35 Z9 35 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD APR 1 PY 1994 VL 99 IS A4 BP 5915 EP 5921 DI 10.1029/93JA03243 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NF580 UT WOS:A1994NF58000020 ER PT J AU SONG, P RUSSELL, CT GARY, SP AF SONG, P RUSSELL, CT GARY, SP TI IDENTIFICATION OF LOW-FREQUENCY FLUCTUATIONS IN THE TERRESTRIAL MAGNETOSHEATH SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID QUASI-PERPENDICULAR SHOCK; SOLAR-WIND; MIRROR WAVES; MAGNETOHYDRODYNAMIC FLUCTUATIONS; ANISOTROPY INSTABILITIES; DAYSIDE MAGNETOSPHERE; SUBSOLAR MAGNETOPAUSE; EARTHS MAGNETOSHEATH; HYDROMAGNETIC WAVES; ULF FLUCTUATIONS AB On the basis of MHD theory we develop a scheme for distinguishing among the four low-frequency modes which may propagate in a high-beta anisotropic plasma such as the magnetosheath: the fast and slow magnetosonic, the Alfven, and mirror modes. We use four parameters: the ratio of transverse to compressional powers in the magnetic field, the ratio of the wave powers in the thermal pressure and in the magnetic field, the ratio of the perturbations in the thermal and magnetic pressures, and the ratio of the wave powers in the velocity and in the magnetic field. In the test case of an Active Magnetospheric Particle Tracer Explores/Ion Release Module (AMPTE/IRM) magnetosheath pass near the Sun-Earth line downstream of a quasi-perpendicular shock, the four modes can be clearly distinguished both spatially and spectrally. Near the bow shock, the waves are Alfvenic in a large frequency range, 1 to 100 mHz. In the middle and inner magnetosheath, the waves below 10 mHz are Alfvenic. The fast mode waves occur in the higher-frequency end of the enhanced spectrum, 80 mHz for the middle magnetosheath and 55 mHz for the inner sheath. The wave enhancement in the intermediate frequencies is slow modes in the inner sheath and mirror modes in the middle sheath. This confirms the earlier report of the existence of the slow mode waves near the magnetopause. These slow waves provide evidence that the magnetopause is an active source of the waves in the sheath. We also show that the measured frequency of a wave is close to an invariant if the magnetosheath flow is in a steady state. Therefore changes in the frequencies of enhanced waves indicate emergence, or damping, or mode conversion of the waves. C1 UNIV CALIF LOS ANGELES,INST GEOPHYS & PLANETARY PHYS,LOS ANGELES,CA 90024. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SONG, P (reprint author), NATL CTR ATMOSPHER RES,HIGH ALTITUDE OBSERV,BOULDER,CO 80307, USA. OI Russell, Christopher/0000-0003-1639-8298 NR 50 TC 80 Z9 81 U1 1 U2 9 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD APR 1 PY 1994 VL 99 IS A4 BP 6011 EP 6025 DI 10.1029/93JA03300 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NF580 UT WOS:A1994NF58000028 ER PT J AU HAMMOND, CM KIVELSON, MG WALKER, RJ AF HAMMOND, CM KIVELSON, MG WALKER, RJ TI IMAGING THE EFFECT OF DIPOLE TILT ON MAGNETOTAIL BOUNDARIES SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID MAGNETOSPHERIC MAGNETIC-FIELD; GEOMAGNETIC NEUTRAL SHEET; PLASMA SHEET; POSITION; SHAPE; TAIL; MAGNETOPAUSE; IMP-8; MODEL AB Eight years of IMP 8, four years of ISEE 2, and one year of IMP 7 magnetometer data have been combined to produce an ''image'' of the average magnetic field for a YZ cross section (aberrated GSM) of the magnetotail at a downtail distance of 25 R(E). The shape of the neutral sheet and magnetopause boundaries can be observed directly from the images. A fitting function that qualitatively matches the observed boundary shape can then be chosen. This approach improves on previous fits to possibly unsuitable functional forms specified independently of the data. In addition, as a refinement of previous studies, we have corrected for varying solar wind dynamic pressure and the effects of tail flaring. We find the magnetopause is displaced above the XY plane with increasing dipole tilt. The neutral sheet is found to curve slightly more than the model of Fairfield (1980) during times of large dipole tilt and near the flanks appears to differ substantially from the neutral sheet shape given by the analytic model of Voigt [1984], the more recent neutral sheet model of Dandouras (1988) based on the Voigt model, and the semi-empirical model of Tsyganenko (1989). C1 UNIV CALIF LOS ANGELES,INST GEOPHYS & PLANETARY PHYS,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,DEPT EARTH & SPACE SCI,LOS ANGELES,CA 90024. RP HAMMOND, CM (reprint author), LOS ALAMOS NATL LAB,MAIL STOP D466,LOS ALAMOS,NM 87545, USA. RI Kivelson, Margaret/I-9019-2012 OI Kivelson, Margaret/0000-0003-3859-8581 NR 25 TC 26 Z9 26 U1 0 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD APR 1 PY 1994 VL 99 IS A4 BP 6079 EP 6092 DI 10.1029/93JA01924 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NF580 UT WOS:A1994NF58000032 ER PT J AU WINTERHALTER, D SMITH, EJ BURTON, ME MURPHY, N MCCOMAS, DJ AF WINTERHALTER, D SMITH, EJ BURTON, ME MURPHY, N MCCOMAS, DJ TI THE HELIOSPHERIC PLASMA SHEET SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID INTERPLANETARY MAGNETIC-FIELD; PLANETARY SECTOR BOUNDARIES; SOLAR-WIND; CORONAL STREAMERS; 1 AU; DYNAMICS; HELIUM; TAIL AB High-resolution magnetic field and plasma data gathered by ISEE 3/ICE during several sector boundary crossings are used to investigate the narrow heliospheric current sheet (almost-equal-to 3 x 10(3) km to 10(4) km thick), together with the heliospheric plasma sheet in which it is embedded. The heliospheric plasma sheet region is identified by a significantly enhanced plasma beta caused by density enhancements and diminished magnetic field strength and is about 20 to 30 times the thickness of the current sheet. The thickness of the heliospheric plasma sheet is found to increase exponentially with its average proton density. The heliospheric current sheet is often displaced to one edge or the other of the heliospheric plasma sheet. Further, the point of maximum plasma beta in the plasma sheet, where the magnetic field strength is at a broad local minimum, is not colocated with the heliospheric current sheet. Within the plasma sheet, changes in the magnetic pressure are balanced by corresponding changes in the plasma thermal pressure as expected for a convected solar wind feature. In addition, observations show small pressure differences between the regions upstream and downstream of the plasma sheet, which are interpreted as causing the plasma sheet to move across the spacecraft. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP WINTERHALTER, D (reprint author), JET PROP LAB,MS 169506,4800 OAK GROVE DR,PASADENA,CA 91109, USA. NR 33 TC 166 Z9 170 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD APR 1 PY 1994 VL 99 IS A4 BP 6667 EP 6680 DI 10.1029/93JA03481 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NF580 UT WOS:A1994NF58000081 ER PT J AU DEMIR, Z NARASIMHAN, TN AF DEMIR, Z NARASIMHAN, TN TI IMPROVED INTERPRETATION OF HVORSLEV TESTS SO JOURNAL OF HYDRAULIC ENGINEERING-ASCE LA English DT Article ID FLOW AB The Hvorslev method constitutes a rapid means of characterizing the hydraulic conductivity of shallow ground-water systems. Because the method is widely used, it is of practical benefit to know the limits and accuracy of the method. An important aspect of the Hvorslev analysis is that the role of specific storage (S(s)) is completely ignored. Results of this study show that the Hvorslev method provides acceptable estimates of hydraulic conductivity in the case of zero-penetration boreholes in which water enters only from the borehole bottom. In this case, relatively large errors arise due to uncertainty in the intake geometry (planate or hemispherical intake) than those arising from neglecting S(s). Results presented show that in screened boreholes, in which radial and spherical flow symmetries coexist, S(s) cannot be reasonably neglected. Due to the influence of S(s), the pressure transient data deviates significantly from the semilogarithmic straight line intrinsic to the Hvorslev idealization, with the deviation increasing with increasing S(s). A consequence is that the estimation of K either by the application of the Hvorslev formula or by the basic time-lag method is rendered ambiguous. For these cases, it appears advisable to dispense with the Hvorslev-interpretation method and analyze the data using the slug-test techniques of ground-water hydrology that account for S(s). This strategy of interpretation does not only yield a better estimate of hydraulic conductivity, but also yields one additional hydraulic parameter, namely, S(s). C1 LAWRENCE BERKELEY LAB,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DEPT EARTH SCI,BERKELEY,CA 94720. RP DEMIR, Z (reprint author), WEISS ASSOCIATES,5500 SHELL MOUND RD,EMERYVILLE,CA 94608, USA. NR 10 TC 9 Z9 9 U1 0 U2 1 PU ASCE-AMER SOC CIVIL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2398 SN 0733-9429 J9 J HYDRAUL ENG-ASCE JI J. Hydraul. Eng.-ASCE PD APR PY 1994 VL 120 IS 4 BP 477 EP 494 DI 10.1061/(ASCE)0733-9429(1994)120:4(477) PG 18 WC Engineering, Civil; Engineering, Mechanical; Water Resources SC Engineering; Water Resources GA NC383 UT WOS:A1994NC38300004 ER PT J AU WYLIE, AH AF WYLIE, AH TI A PRESSURE-PACKER SYSTEM FOR CONDUCTING RISING HEAD TESTS IN WATER-TABLE WELLS - COMMENT SO JOURNAL OF HYDROLOGY LA English DT Note RP WYLIE, AH (reprint author), EG&G IDAHO INC,POB 1625,IDAHO FALLS,ID 83415, 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 0022-1694 J9 J HYDROL JI J. Hydrol. PD APR PY 1994 VL 156 IS 1-4 BP 471 EP 473 DI 10.1016/0022-1694(94)90091-4 PG 3 WC Engineering, Civil; Geosciences, Multidisciplinary; Water Resources SC Engineering; Geology; Water Resources GA NF770 UT WOS:A1994NF77000024 ER PT J AU WEST, RH BUKER, H FRIEBELE, EJ HENSCHEL, H LYONS, PB AF WEST, RH BUKER, H FRIEBELE, EJ HENSCHEL, H LYONS, PB TI THE USE OF OPTICAL-TIME DOMAIN REFLECTOMETERS TO MEASURE RADIATION-INDUCED LOSSES IN OPTICAL FIBERS SO JOURNAL OF LIGHTWAVE TECHNOLOGY LA English DT Article ID STEADY-STATE EXPOSURES; INDUCED ATTENUATION AB Fiber-optics exposed to ionising radiation suffer from induced transmission loss from which recovery can take place over periods up to years after exposure. Measurement of this behavior presents difficulties over the longer times, but is necessary to permit predictions of fiber behavior in applications where long-term exposure to ionising radiation is involved, as in reactor environments, medical applications, space or accelerator instrumentation. This paper presents a summary of a study by a number of laboratories of the NATO Panel IV, Research Study Group 12 Nuclear Effects Task Group into the suitability of the use of optical time domain reflectometry for these measurements. Results are shown which validate this approach when used according to recommended guidelines. C1 RES CTR,JULICH,GERMANY. USN,RES LAB,WASHINGTON,DC 20375. FRAUNHOFER INST NATURWISSENSCH TECH TRENDANALYSEN,EUSKIRCHEN,GERMANY. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RP WEST, RH (reprint author), ROYAL MIL COLL SCI,SWINDON SN6 8LA,WILTS,ENGLAND. NR 15 TC 8 Z9 8 U1 0 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0733-8724 J9 J LIGHTWAVE TECHNOL JI J. Lightwave Technol. PD APR PY 1994 VL 12 IS 4 BP 614 EP 620 DI 10.1109/50.285354 PG 7 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA NP299 UT WOS:A1994NP29900006 ER PT J AU FAN, TWM CLIFFORD, AJ HIGASHI, RM AF FAN, TWM CLIFFORD, AJ HIGASHI, RM TI IN-VIVO C-13 NMR ANALYSIS OF ACYL-CHAIN COMPOSITION AND ORGANIZATION OF PERIRENAL TRIACYLGLYCERIDES IN RATS FED VEGETABLE AND FISH OILS SO JOURNAL OF LIPID RESEARCH LA English DT Article DE RAT PERIRENAL FAT; LIPID; SPIN-LATTICE RELAXATION TIME; SURFACE COIL; OLIVE OIL; SAFFLOWER OIL; MENHADEN OIL ID NUCLEAR MAGNETIC-RESONANCE; N-3 FATTY-ACIDS; ADIPOSE-TISSUE; LIPID-PEROXIDATION; DIETARY LIPIDS; METABOLISM; LIVER; COIL; SPECTROSCOPY; RECOVERY AB Lipid composition of body fat can be a key indicator of nutritional status and a number of human disorders. In vivo C-13 NMR provides for repeated, noninvasive analysis of fatty acyl chain composition on individuals, which circumvents classical problems of individual variation and repetitive invasive sampling. It also offers a unique opportunity to examine acyl chain organization in situ. This approach was used to examine the fatty acyl chain composition in the perirenal fat pads of rats fed olive, safflower, and menhaden oil-containing diets. These changes were then monitored during a diet switch between olive and menhaden oil-fed rats. The fatty acid composition of perirenal fat pads and livers was also analyzed using gas chromatography for comparison with the in vivo NMR analysis. Both tissues assumed the general characteristics of diet fatty acyl chain and fatty acid composition and the diet switch induced a switchover of the perirenal composition in 30-45 days. These results indicate that a large portion of the diet fatty acyl chains were incorporated directly into adipose and liver tissues although some were also metabolized, particularly in menhaden oil-fed rats. Furthermore, changes in the in vivo spin-lattice relaxation times (T-1) of fatty acyl carbons in the perirenal fat pads and their lipid extracts were followed and effective correlation times (T-eff) were calculated from the T-1 data. The result indicated that the in vivo segmental mobility of acyl carbons was sensitive to changes in diet-derived fatty acyl chain composition and that the central region of the acyl chain was more sensitive to these changes. There was a qualitative similarity but quantitative differences in the T-eff pf acyl carbons acquired in vivo and from extracts. triacylglycerides experience an overall liquid-like microenvironment in vivo but with more restriction in their mobility, and that different factors may exist in governing their organization in situ versus in extracts. C1 LAWRENCE LIVERMORE NATL LAB,DEPT NUTR,DAVIS,CA 95616. UNIV CALIF BODEGA,MARINE LAB,BODEGA BAY,CA 94923. RP FAN, TWM (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT LAND AIR & WATER RESOURCES,DAVIS,CA 95616, USA. FU NIDDK NIH HHS [DK38637, DK43098] NR 27 TC 16 Z9 16 U1 0 U2 2 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 APR PY 1994 VL 35 IS 4 BP 678 EP 689 PG 12 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA NE368 UT WOS:A1994NE36800014 PM 8006523 ER PT J AU THOMPSON, JD LAWRENCE, JM FISK, Z AF THOMPSON, JD LAWRENCE, JM FISK, Z TI SCALING IN HEAVY-FERMION SYSTEMS SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT International Workshop on Cuprate and Heavy Fermion Superconductors CY SEP 27-30, 1993 CL COLOGNE, GERMANY SP UNIV COLOGNE, PHYS DEPT ID DILUTE MAGNETIC-ALLOYS; HIGH-PRESSURE; ELECTRON; SUSCEPTIBILITY; CERU2SI2; UPT3 AB Ambient pressure characteristics of heavy-fermion compounds, such as the ratio of the low temperature magnetic susceptibility to the electronic specific heat coefficient gamma and a simple relationship between the T2-coefficient of resistivity and gamma2, suggest that a single-energy scale To dictates the physics of these materials. Such is the case for Kondo-impurity systems to which heavy-fermions are related. We consider the consequences of assuming that the electronic free energy is given by a universal function of T/T0(V) where V is the molar volume. We show that volume-dependent magnetic susceptibility, specific heat and electrical resistivity of some heavy-fermion compounds scale as T/T0(V), at least over a range in pressures and temperatures, A further consequence of the principle assumption is that Gruneisen parameters defined as partial derivative ln X/partial derivative lnV, where X is some physical properly, should be identical for all properties and equal to that determined from electronic contributions to the volume-thermal expansion coefficient and specific heat. In several materials, this equality holds, at least approximately. Although evidence is found for single-energy scaling in heavy-fermion materials, we cannot conclude unambiguously that the basic assumption is correct in detail. C1 UNIV CALIF IRVINE,DEPT PHYS,IRVINE,CA 92717. RP THOMPSON, JD (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 31 TC 12 Z9 12 U1 0 U2 6 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD APR PY 1994 VL 95 IS 1-2 BP 59 EP 74 DI 10.1007/BF00754923 PG 16 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NJ716 UT WOS:A1994NJ71600007 ER PT J AU SMITH, JL BROOKS, JS FOWLER, CM FREEMAN, BL GOETTEE, JD HULTS, WL KING, JC MANKIEWICH, PM DEOBALDIA, EI OMALLEY, ML RICKEL, DG SKOCPOL, WJ AF SMITH, JL BROOKS, JS FOWLER, CM FREEMAN, BL GOETTEE, JD HULTS, WL KING, JC MANKIEWICH, PM DEOBALDIA, EI OMALLEY, ML RICKEL, DG SKOCPOL, WJ TI HIGH-FIELD MEASUREMENTS ON YBCO SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT International Workshop on Cuprate and Heavy Fermion Superconductors CY SEP 27-30, 1993 CL COLOGNE, GERMANY SP UNIV COLOGNE, PHYS DEPT ID SUPERCONDUCTING TRANSITION; BEHAVIOR AB We have performed resistance measurements on thin films of the high-temperature superconductor YBa2Cu3O7 (YBCO) in applied magnetic fields to above 200 T (2 MegaOersted) at temperatures as low as 2.5 K. The fields are produced by an explosively driven flux-compression system. We can see a particularly clear onset, without replotting the data, of the ''hydrodynamic'' flow of vortices probably because of the very fast increasing field. The low temperature ''critical field'' for the field parallel to the c-axis of the sample is 135 T. Our data in the other direction are still preliminary. We discuss possible interpretation of our results. C1 BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215. AT&T BELL LABS,HOLMDEL,NJ 07728. RP SMITH, JL (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Goettee, Jeffrey/L-4926-2015 NR 17 TC 10 Z9 10 U1 0 U2 1 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD APR PY 1994 VL 95 IS 1-2 BP 75 EP 81 DI 10.1007/BF00754924 PG 7 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NJ716 UT WOS:A1994NJ71600008 ER PT J AU BRISON, JP KELLER, N LEJAY, P THOLENCE, JL HUXLEY, A BERNHOEFT, N BUZDIN, AI FAK, B FLOUQUET, J SCHMIDT, L STEPANOV, A FISHER, RA PHILLIPS, N VETTIER, C AF BRISON, JP KELLER, N LEJAY, P THOLENCE, JL HUXLEY, A BERNHOEFT, N BUZDIN, AI FAK, B FLOUQUET, J SCHMIDT, L STEPANOV, A FISHER, RA PHILLIPS, N VETTIER, C TI MAGNETISM AND SUPERCONDUCTIVITY IN HEAVY-FERMION SYSTEMS SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT International Workshop on Cuprate and Heavy Fermion Superconductors CY SEP 27-30, 1993 CL COLOGNE, GERMANY SP UNIV COLOGNE, PHYS DEPT ID ANTIFERROMAGNETIC ORDER; UPT3; URU2SI2; PRESSURE; PHASES AB We discuss some consequences of the interplay between magnetism and superconductivity in the two heavy fermion systems URu2Si2 and UPt3, notably on the temperature dependence of the specific heat, on possible observation of Larkin-Ovchinnikov-Fulde-Ferrel phase, and on the anisotropy of the upper critical field. We demonstrate that in UPt3, a clear double steep superconducting transition can be obtained reversibly. C1 CENG,SPSMS,DRFMC,F-38041 GRENOBLE,FRANCE. LAWRENCE BERKELEY LAB,MMRD,BERKELEY,CA 94720. EUROPEAN SYNCHROTRON RES FACIL,F-38043 GRENOBLE,FRANCE. RP BRISON, JP (reprint author), UNIV JOSEPH FOURIER,CTR RECH TRES BASSES TEMP,CNRS,BP 166,F-38042 GRENOBLE 9,FRANCE. RI Buzdin, Alexander/I-6038-2013 NR 32 TC 40 Z9 40 U1 2 U2 7 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD APR PY 1994 VL 95 IS 1-2 BP 145 EP 152 DI 10.1007/BF00754931 PG 8 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NJ716 UT WOS:A1994NJ71600015 ER PT J AU MAPLE, MB SEAMAN, CL GAJEWSKI, DA DALICHAOUCH, Y BARBETTA, VB DEANDRADE, MC MOOK, HA LUKEFAHR, HG BERNAL, OO MACLAUGHLIN, DE AF MAPLE, MB SEAMAN, CL GAJEWSKI, DA DALICHAOUCH, Y BARBETTA, VB DEANDRADE, MC MOOK, HA LUKEFAHR, HG BERNAL, OO MACLAUGHLIN, DE TI NON FERMI-LIQUID BEHAVIOR IN STRONGLY CORRELATED F-ELECTRON MATERIALS SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article ID MULTICHANNEL KONDO PROBLEM; LOW-TEMPERATURE PROPERTIES; Y1-XUXPD3; MODEL; UPD3 AB Evidence for non Fermi liquid (NFL) behavior in Y1-xUxPd3 and related systems is reviewed and discussed within the context of possible microscopic mechanisms. Low temperature electrical resistivity, specific heat, and magnetic susceptibility measurements on the Th1-xUxPd2Al3 system reveal unconventional Kondo behavior with NFL low temperature characteristics. Magnetic susceptibility measurements on UCu3.5Pd1.5, which has previously been shown to exhibit NFL behavior, are presented. Some systematics of the NFL low temperature behavior observed in several f-electron materials include a linear temperature dependence of the electrical resistivity rho approximately 1 - aT with either positive or negative coefficient a, a logarithmically diverging specific heat C/T is similar to - ln T, and T1/2 asymptotic behavior of the magnetic susceptibility chi approximately 1 - T1/2. C1 UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, LA JOLLA, CA 92093 USA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. WHITTIER COLL, DEPT PHYS, WHITTIER, CA 90608 USA. UNIV CALIF RIVERSIDE, DEPT PHYS, RIVERSIDE, CA 92521 USA. RP MAPLE, MB (reprint author), UNIV CALIF SAN DIEGO, DEPT PHYS, LA JOLLA, CA 92093 USA. RI Barbeta, Vagner/F-2488-2010 OI Barbeta, Vagner/0000-0001-8023-7080 NR 45 TC 169 Z9 169 U1 2 U2 14 PU SPRINGER/PLENUM PUBLISHERS PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD APR PY 1994 VL 95 IS 1-2 BP 225 EP 243 DI 10.1007/BF00754938 PG 19 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NJ716 UT WOS:A1994NJ71600022 ER PT J AU CAMPUZANO, JC GOFRON, K DING, H LIU, R DABROWSKI, B VEAL, BJW AF CAMPUZANO, JC GOFRON, K DING, H LIU, R DABROWSKI, B VEAL, BJW TI PHOTOEMISSION FROM THE HIGH T(C) SUPERCONDUCTORS SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT International Workshop on Cuprate and Heavy Fermion Superconductors CY SEP 27-30, 1993 CL COLOGNE, GERMANY SP UNIV COLOGNE, PHYS DEPT ID SINGULARITIES; LIFETIME AB The electronic structures of YBa2Cu3Ox and YBa2Cu4O8 were studied by angle-resolved photoemission with an energy resolution of better than 10 meV. A detailed study in the 1st and 2nd Brillouin zone of untwinned single crystals shows the presence of ''extended'' saddle point singularities in the band structure in the vicinity of the Fermi energy, which give rise to van Hove singularities in the density of states. The binding energy of the singularity depends on the doping. We show that this extended saddle point singularity leads to a density of states which diverges as epsilon-1/2 which in turn can lead to very high transition temperatures even in a BCS scheme with weak coupling. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP CAMPUZANO, JC (reprint author), UNIV ILLINOIS,DEPT PHYS,POB 4348,CHICAGO,IL 60680, USA. RI Campuzano, Juan Carlos/G-4358-2012; OI Ding, Hong/0000-0003-4422-9248 NR 20 TC 12 Z9 12 U1 0 U2 1 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD APR PY 1994 VL 95 IS 1-2 BP 245 EP 250 DI 10.1007/BF00754939 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NJ716 UT WOS:A1994NJ71600023 ER PT J AU AXE, JD CRAWFORD, MK AF AXE, JD CRAWFORD, MK TI STRUCTURAL INSTABILITIES IN LANTHANUM CUPRATE SUPERCONDUCTORS SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT International Workshop on Cuprate and Heavy Fermion Superconductors CY SEP 27-30, 1993 CL COLOGNE, GERMANY SP UNIV COLOGNE, PHYS DEPT ID HIGH-TC SUPERCONDUCTIVITY; LOW-TEMPERATURE PHASE; LATTICE INSTABILITIES; OXYGEN DEFICIENCY; DOPED LA2CUO4; TRANSITION; LA2-XBAXCUO4; LA2-XSRXCUO4; TRANSPORT; ANOMALIES AB Subtle but well characterized structural phase transformations occur at low temperatures in some lanthanum cuprate superconductors. These transformations, which involve collective tilting of the CuO6 octahedra, have a strong influence on superconducting and normal state properties. Experiments suggest that for a given hole doping the following hierarchy exists for superconductivity in these materials: T(C) (HTT)> T(C)(LTO)> T(C)(LTT), where HTT represents the untilled structure and LTO and LTT are the two limiting low temperature tilted structures. An additional very strong suppression of T(C), suggestive of a competing electronic groundstate, occurs in the LTT phase for a hole to Cu ratio of 1/8. Neither of these effects are understood at present. This paper reviews both the evidence upon which these conclusions are based and some outstanding unanswered questions. C1 DUPONT CO INC,WILMINGTON,DE 19880. RP AXE, JD (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 68 TC 50 Z9 50 U1 1 U2 6 PU KLUWER ACADEMIC/PLENUM PUBL PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD APR PY 1994 VL 95 IS 1-2 BP 271 EP 284 DI 10.1007/BF00754942 PG 14 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NJ716 UT WOS:A1994NJ71600026 ER PT J AU GODLEWSKI, M CHEN, WM MONEMAR, B AF GODLEWSKI, M CHEN, WM MONEMAR, B TI APPLICATION OF THE ODCR EXPERIMENT TO THE IDENTIFICATION OF RADIATIVE RECOMBINATION PROCESSES SO JOURNAL OF LUMINESCENCE LA English DT Article; Proceedings Paper CT 1993 International Conference on Luminescence (ICL 93) CY AUG 09-13, 1993 CL UNIV CONNECTICUT, STORRS, CT SP UNIV CONNECTICUT, OPT SOC AMER, AMER PHYS SOC, IEEE, LASER & ELECTRO OPT SOC, INT UNION PURE & APPL PHYS, INT SCI FDN, UNIV CONNECTICUT RES FDN HO UNIV CONNECTICUT ID OPTICAL-DETECTION; CYCLOTRON-RESONANCE AB The technique of optically detected cyclotron resonance (ODCR) has been introduced to increase the sensitivity of the conventional cyclotron resonance investigations. Here a new application of the ODCR is described. It is shown that the ODCR can be used for a high spectral resolution photoluminescence (PL) experiments and can allow the identification of recombination processes in both bulk and in low-dimensional systems. C1 LINKOPING UNIV,DEPT PHYS & MEASUREMENT TECHNOL,S-58183 LINKOPING,SWEDEN. LAWRENCE BERKELEY LAB,ADV MAT LAB,BERKELEY,CA 94720. RP GODLEWSKI, M (reprint author), POLISH ACAD SCI,INST PHYS,AL LOTNIKOW 32-46,PL-02668 WARSAW,POLAND. RI Materials, Semiconductor/I-6323-2013; Chen, Weimin/J-4660-2012; Monemar, Bo/B-3718-2016; Godlewski, Marek/S-5288-2016 OI Chen, Weimin/0000-0002-6405-9509; NR 5 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-2313 J9 J LUMIN JI J. Lumines. PD APR PY 1994 VL 60-1 BP 52 EP 55 DI 10.1016/0022-2313(94)90092-2 PG 4 WC Optics SC Optics GA NR361 UT WOS:A1994NR36100015 ER PT J AU STUMP, NA SCHWEITZER, GK MURRAY, GM PETERSON, JR AF STUMP, NA SCHWEITZER, GK MURRAY, GM PETERSON, JR TI LUMINESCENCE DETECTION OF CATION-EXCHANGE IN NA3[EU(2,6-PYRIDINEDICARBOXYLATO)3] SO JOURNAL OF LUMINESCENCE LA English DT Article ID SPECTRA AB The exchange of several other cations for the Na+ ions in Na3[Eu(2,6-pyridinedicarboxylato)3] was investigated using Eu3+ ion luminescence spectroscopy. Monovalent, divalent, and trivalent metal ions, as well as the monovalent ammonium ion, replaced the Na+ ion via mass action to form various salts with the Eu(2,6-pyridinedicarboxylato)33- complex anion. The detection of the cation exchange was achieved because of the sensitivity of Eu3+ ion luminescence to the near environment of the Eu3+ ion. C1 UNIV TENNESSEE, DEPT CHEM, KNOXVILLE, TN 37996 USA. UNIV MARYLAND, DEPT CHEM & BIOCHEM, CATONSVILLE, MD 21228 USA. OAK RIDGE NATL LAB, DIV CHEM, TRANSURANIUM RES LAB, OAK RIDGE, TN 37831 USA. RI Murray, George/A-6625-2011 NR 5 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-2313 EI 1872-7883 J9 J LUMIN JI J. Lumines. PD APR PY 1994 VL 60-1 BP 104 EP 107 DI 10.1016/0022-2313(94)90105-8 PG 4 WC Optics SC Optics GA NR361 UT WOS:A1994NR36100028 ER PT J AU LYO, SK JONES, ED KURTZ, SR AF LYO, SK JONES, ED KURTZ, SR TI EFFECT OF EXCITON LOCALIZATION AND DELOCALIZATION ON MAGNETIC-FIELD-DEPENDENT PHOTOLUMINESCENCE LINE WIDTHS IN SEMICONDUCTORS SO JOURNAL OF LUMINESCENCE LA English DT Article; Proceedings Paper CT 1993 International Conference on Luminescence (ICL 93) CY AUG 09-13, 1993 CL UNIV CONNECTICUT, STORRS, CT SP UNIV CONNECTICUT, OPT SOC AMER, AMER PHYS SOC, IEEE, LASER & ELECTRO OPT SOC, INT UNION PURE & APPL PHYS, INT SCI FDN, UNIV CONNECTICUT RES FDN HO UNIV CONNECTICUT ID ALLOYS; LINEWIDTH AB Theory and data are presented for the photoluminescence line width in ordered and disordered semiconductor alloys at low temperatures. In disordered (ordered) systems, the line width is due to exciton localization (exciton-impurity scattering) and increases (decreases) as a function of the magnetic field in agreement with the data. RP LYO, SK (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-2313 J9 J LUMIN JI J. Lumines. PD APR PY 1994 VL 60-1 BP 409 EP 412 DI 10.1016/0022-2313(94)90178-3 PG 4 WC Optics SC Optics GA NR361 UT WOS:A1994NR36100101 ER PT J AU CASTNER, EW CHANG, YJ MELINGER, JS MCMORROW, D AF CASTNER, EW CHANG, YJ MELINGER, JS MCMORROW, D TI FEMTOSECOND FOURIER-TRANSFORM SPECTROSCOPY OF LOW-FREQUENCY INTERMOLECULAR MOTIONS IN WEAKLY INTERACTING LIQUIDS SO JOURNAL OF LUMINESCENCE LA English DT Article; Proceedings Paper CT 1993 International Conference on Luminescence (ICL 93) CY AUG 09-13, 1993 CL UNIV CONNECTICUT, STORRS, CT SP UNIV CONNECTICUT, OPT SOC AMER, AMER PHYS SOC, IEEE, LASER & ELECTRO OPT SOC, INT UNION PURE & APPL PHYS, INT SCI FDN, UNIV CONNECTICUT RES FDN HO UNIV CONNECTICUT ID VIBRATIONAL MOTION; RAMAN-SCATTERING; DYNAMICS AB We present new results on the temperature-dependent collision-induced low-frequency Raman spectrum of the spherical top molecule CCl4, obtained using optical-heterodyne-detected, femtosecond Fourier-transform Raman-induced Kerr-effect spectroscopy. A spectral shift to lower frequencies with increasing temperatures has been observed. C1 USN,RES LAB,WASHINGTON,DC 20375. RP CASTNER, EW (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 14 TC 17 Z9 17 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-2313 J9 J LUMIN JI J. Lumines. PD APR PY 1994 VL 60-1 BP 723 EP 726 DI 10.1016/0022-2313(94)90261-5 PG 4 WC Optics SC Optics GA NR361 UT WOS:A1994NR36100184 ER PT J AU HJALMARSON, HP GILLILAND, GD WOLFORD, DJ KUECH, TF BRADLEY, JA AF HJALMARSON, HP GILLILAND, GD WOLFORD, DJ KUECH, TF BRADLEY, JA TI TEMPERATURE-DEPENDENT RADIATIVE RECOMBINATION OF FREE-EXCITONS IN HIGH-QUALITY GAAS HETEROSTRUCTURES SO JOURNAL OF LUMINESCENCE LA English DT Article; Proceedings Paper CT 1993 International Conference on Luminescence (ICL 93) CY AUG 09-13, 1993 CL UNIV CONNECTICUT, STORRS, CT SP UNIV CONNECTICUT, OPT SOC AMER, AMER PHYS SOC, IEEE, LASER & ELECTRO OPT SOC, INT UNION PURE & APPL PHYS, INT SCI FDN, UNIV CONNECTICUT RES FDN HO UNIV CONNECTICUT AB We have measured photoluminescence decay kinetics versus temperature for high-quality MOCVD GaAs/Al0.3GaAs0.7 double heterostructures which have been thoroughly characterized at room temperature. The measured lifetime is in good agreement with the lifetime obtained from a kinetic model of interacting free carriers and excitons. This theory explains the evolution from exponential decay at very low temperatures to more nonexponential bimolecular decay at higher temperature in terms of thermal ionization of the excitons. The theory shows that the temperature dependence of the decay kinetics can be nearly entirely explained in terms of a temperature-independent radiative lifetime. C1 IBM CORP,DIV RES,TJ WATSON RES CTR,YORKTOWN HTS,NY 10598. UNIV WISCONSIN,DEPT CHEM ENGN,MADISON,WI 53706. EMORY UNIV,DEPT PHYS,ATLANTA,GA 30322. RP HJALMARSON, HP (reprint author), SANDIA NATL LABS,DEPT 1322,ALBUQUERQUE,NM 87185, USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-2313 J9 J LUMIN JI J. Lumines. PD APR PY 1994 VL 60-1 BP 830 EP 833 DI 10.1016/0022-2313(94)90289-5 PG 4 WC Optics SC Optics GA NR361 UT WOS:A1994NR36100213 ER PT J AU BRONOLD, FX SAXENA, A BISHOP, AR AF BRONOLD, FX SAXENA, A BISHOP, AR TI RADIATIVE PROCESSES IN POLY(PHENYLENE VINYLENE) SO JOURNAL OF LUMINESCENCE LA English DT Article; Proceedings Paper CT 1993 International Conference on Luminescence (ICL 93) CY AUG 09-13, 1993 CL UNIV CONNECTICUT, STORRS, CT SP UNIV CONNECTICUT, OPT SOC AMER, AMER PHYS SOC, IEEE, LASER & ELECTRO OPT SOC, INT UNION PURE & APPL PHYS, INT SCI FDN, UNIV CONNECTICUT RES FDN HO UNIV CONNECTICUT ID CONJUGATED POLYMERS; TRANS-POLYACETYLENE; SINGLET AB Within a single-electron Su-Schrieffer-Heeger-like model Hamiltonian for poly(phenylene vinylene) we investigate the effect of electron-lattice coupling on the radiative decay of polaron-excitons, using a lattice relaxation theory together with a real-space random-phase-approximation. In general, the phonon modes in the ground state and the polaron-exciton configurations differ not only in their frequencies and equilibrium positions but also in their principal axes. However, in our calculation of the transition amplitude, we neglect the latter and consider only one decay channel for each (polaron-exciton) normal mode. Since our theoretically obtained photoluminescence spectra fit quite well with experiments, it seems unnecessary to include the difference in principal axes explicitly and, consequently, to allow for more decay channels. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP BRONOLD, FX (reprint author), UNIV BAYREUTH,INST PHYS,D-95440 BAYREUTH,GERMANY. NR 14 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-2313 J9 J LUMIN JI J. Lumines. PD APR PY 1994 VL 60-1 BP 849 EP 852 DI 10.1016/0022-2313(94)90294-1 PG 4 WC Optics SC Optics GA NR361 UT WOS:A1994NR36100218 ER PT J AU LIU, GK AF LIU, GK TI UP-CONVERSION AND CROSS-RELAXATION IN TB-3+LIYF4 SO JOURNAL OF LUMINESCENCE LA English DT Article; Proceedings Paper CT 1993 International Conference on Luminescence (ICL 93) CY AUG 09-13, 1993 CL UNIV CONNECTICUT, STORRS, CT SP UNIV CONNECTICUT, OPT SOC AMER, AMER PHYS SOC, IEEE, LASER & ELECTRO OPT SOC, INT UNION PURE & APPL PHYS, INT SCI FDN, UNIV CONNECTICUT RES FDN HO UNIV CONNECTICUT AB Efficient cross-relaxation occurs in 1% Tb3+:LiYF4 between the 5D3 --> 5D4 and F-7(1) <-- F-7(6) transitions following ultraviolet excitation. When the 5D4 state is directly pumped, anti-Stokes fluorescence from the higher 5D3 state is observed and attributed to energy transfer up-conversion. The Inokuti-Hirayama model is modified to analyze the up-conversion process and cross relaxation in this system. RP LIU, GK (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 7 TC 7 Z9 8 U1 1 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-2313 J9 J LUMIN JI J. Lumines. PD APR PY 1994 VL 60-1 BP 860 EP 863 DI 10.1016/0022-2313(94)90297-6 PG 4 WC Optics SC Optics GA NR361 UT WOS:A1994NR36100221 ER PT J AU COCKROFT, NJ MURDOCH, KM AF COCKROFT, NJ MURDOCH, KM TI ENERGY-TRANSFER BETWEEN THULIUM AND PRASEODYMIUM IONS IN SOLIDS SO JOURNAL OF LUMINESCENCE LA English DT Article; Proceedings Paper CT 1993 International Conference on Luminescence (ICL 93) CY AUG 09-13, 1993 CL UNIV CONNECTICUT, STORRS, CT SP UNIV CONNECTICUT, OPT SOC AMER, AMER PHYS SOC, IEEE, LASER & ELECTRO OPT SOC, INT UNION PURE & APPL PHYS, INT SCI FDN, UNIV CONNECTICUT RES FDN HO UNIV CONNECTICUT ID LASER AB New thulium-to-praseodymium up-conversion and cross-relaxation energy transfer mechanisms are observed. YLiF4 has several subsets of dopant ions, which exhibit a variety of transfer efficiencies. Dual-pulse laser excitation of dimers in CsCdBr3 is used to demonstrate a probable up-conversion pathway. C1 UNIV CANTERBURY,DEPT PHYS & ASTRON,CHRISTCHURCH 1,NEW ZEALAND. RP COCKROFT, NJ (reprint author), LOS ALAMOS NATL LAB,DIV CHEM SCI & TECHNOL,MAILSTOP E535,LOS ALAMOS,NM 87545, USA. NR 5 TC 6 Z9 7 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-2313 J9 J LUMIN JI J. Lumines. PD APR PY 1994 VL 60-1 BP 891 EP 894 DI 10.1016/0022-2313(94)90305-0 PG 4 WC Optics SC Optics GA NR361 UT WOS:A1994NR36100229 ER PT J AU WU, RQ WANG, DS FREEMAN, AJ AF WU, RQ WANG, DS FREEMAN, AJ TI 1ST PRINCIPLES INVESTIGATIONS OF MCD SPECTRA AND SUM-RULES FOR 3D TRANSITION-METAL SURFACES SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article ID MAGNETIC-CIRCULAR-DICHROISM; X-RAY DICHROISM; THIN-FILM MAGNETISM; CORE-LEVEL PHOTOEMISSION; ELECTRONIC-STRUCTURE; FERROMAGNETIC NICKEL; ABSORPTION; SPIN; EDGES; IRON AB Results of precise calculations of the X-ray magnetic-circular-dichroism (MCD) spectra and orbital magnetic moment, [L(z)], based on our thin film full potential linearized augmented plane wave energy band method and a tight binding analysis carried out for Fe(001), Co(0001) and Ni(001) surfaces are shown to provide clear physical insight for this new and exciting phenomenon. In addition to the spin magnetic moment enhancement, the orbital magnetic moment is also found to be enhanced at the surface due to band narrowing. A double peak structure of the MCD spectra for Fe(001) and Co(0001) is predicted. For Ni(001), the absorption side peak 6 eV above the main peak is attributed to contributions from the d component in a high-lying state. The MCD orbital sum rule is found to be valid to within 5-10% even in the band approach. However, for the spin sum rule, large errors are found for Ni systems and, in addition, the magnetic dipole term is also found to be very important in this sum rule for atoms without cubic symmetry. This raises a question about the applicability of the spin sum rule to obtain the spin magnetic moment from MCD spectra. Finally, the effects of a photo-induced core hole are found to be strongly screened, and to induce an enhancement of [L(z)]. C1 NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208. ACAD SINICA,INST PHYS,BEIJING 100080,PEOPLES R CHINA. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RI Wu, Ruqian/C-1395-2013 OI Wu, Ruqian/0000-0002-6156-7874 NR 48 TC 58 Z9 58 U1 1 U2 14 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 APR PY 1994 VL 132 IS 1-3 BP 103 EP 123 DI 10.1016/0304-8853(94)90305-0 PG 21 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA NK942 UT WOS:A1994NK94200013 ER PT J AU HAWK, JA SIMMONS, JW RAWERS, JC AF HAWK, JA SIMMONS, JW RAWERS, JC TI EFFECT OF NITROGEN ALLOYING ON THE MICROSTRUCTURE AND ABRASIVE WEAR OF STAINLESS-STEELS SO JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE LA English DT Article DE ABRASIVE WEAR; CHROMIUM NITRIDE; NITROGEN STAINLESS STEEL AB Alloying stainless steels with nitrogen has distinct advantages. Nitrogen is a strong austenite stabilizer and a potent solid-solution strengthener, and nitrogen has greater solubility than carbon in iron. This study investigates the relationship among nitrogen concentration, precipitate microstructure, and abrasive wear using two high-nitrogen stainless steel alloys: Fe-19Cr-5Mn-5Ni-3Mo (SS1) and Fe-16Cr-7Mn-5Ni (SS2). Alloy SS1 contained 0.7 wt% N and was solution annealed at 1150 degrees C, thereby dissolving the nitrogen interstitially in the austenite. Subsequent aging, or cold work and aging, at 900 degrees C led to the grain-boundary, cellular, and transgranular precipitation of Cr2N. Alloy SS2 was remelted in a high-pressure (200 MPa) N-2 atmosphere, leading to a spatial gradient of nitrogen in the alloy in the form of interstitial nitrogen and Cr2N and CrN precipitates. Nitrogen contents varied from a low of approximately 0.7 wt% at the bottom of the billet to a high of 3.6 wt% at the top. Nitrogen in excess of approximately 0.7 wt% formed increasingly coarser and more numerous Cr2N and CrN precipitates. The precipitate morphology created in alloy SS1 due to aging, or cold work and aging, had little effect on the abrasive wear of the alloy. However, a decrease in the abrasive wear rate in alloy SS2 was observed to correspond to the increase in number and size of the Cr2N and CrN precipitates. RP HAWK, JA (reprint author), US BUR MINES,ALBANY RES CTR,ALBANY,OR 97321, USA. NR 18 TC 2 Z9 3 U1 2 U2 3 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 APR PY 1994 VL 3 IS 2 BP 259 EP 272 DI 10.1007/BF02645852 PG 14 WC Materials Science, Multidisciplinary SC Materials Science GA QE398 UT WOS:A1994QE39800012 ER PT J AU SMITH, JF THOMPSON, RB AF SMITH, JF THOMPSON, RB TI SIMULTANEOUS ULTRASONIC EVALUATION WITH DIFFERENTIATION OF STRESS AND TEXTURE SO JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE LA English DT Article DE SHEET METAL; STRESS; TEXTURE; ULTRASONICS ID RESIDUAL-STRESS; SHEAR-WAVES; PLATES; VELOCITIES; STATES AB An ultrasonic method for either independent or simultaneous determination of stress and texture is discussed. Quantitative differentiation between stress and texture during simultaneous measurements can be made. The method is useful for unidirectionally rolled, extruded, or cast material, and the validity of the method has been experimentally verified by extensive tests on rolled materials. Electromagnetic acoustic transducers (EMAT's) have been used, and these allow measurements during processing. In principle the method is applicable to non-conducting materials if piezoelectric or ferroelectric transducers are used, but since they are contracting and EMAT's are noncontacting, the constraints are more severe. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50010. RP SMITH, JF (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50010, USA. RI 苏, 日亮/D-4386-2009 NR 47 TC 2 Z9 2 U1 1 U2 8 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 APR PY 1994 VL 3 IS 2 BP 273 EP 281 DI 10.1007/BF02645853 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA QE398 UT WOS:A1994QE39800013 ER PT J AU SCHIMEK, GL MCCARLEY, RE CHUMBLEY, LS AF SCHIMEK, GL MCCARLEY, RE CHUMBLEY, LS TI SYNTHESIS AND SUPERSTRUCTURAL CHARACTERIZATION OF FE1.89MO4.11O7 SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID CLUSTERS; CHAINS AB Superstructuring in the new compound Fe1.89Mo4.11O7 has been elucidated by transmission electron microscopy. This compound is a member of the family M2Mo4O7 and has both iron and molybdenum atoms occupying octahedrally coordinated sites in the structure, represented by Fet(Fe0.89Mo0.11)oMo407. The superstructuring, detected only by electron diffraction, involved tripling of all three lattice parameters of the subcell. The subcell was structured by single crystal x-ray diffraction [Imma, no. 74, a = 5.9793(5) angstrom, b = 5.7704(4) angstrom, and c = 17.036(1) angstrom]. This structure type contains a close-packed arrangement of Mo4O7 units, which are infinite chains of trans edge-shared molybdenum octahedra running parallel to b*. Two different coordination environments are observed for the cations. Parallel to the a* direction, infinite edge-sharing MO6 (M = 89% Fe or 11% Mo) octahedra are observed. The second cation site, with nearly tetrahedral coordination by oxygen, is filled solely by iron. The superstructure can be rationalized by a regular arrangement of iron and molybdenum atoms in the octahedrally coordinated cation sites. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. RP SCHIMEK, GL (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 19 TC 2 Z9 2 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD APR PY 1994 VL 9 IS 4 BP 891 EP 897 DI 10.1557/JMR.1994.0891 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA NA985 UT WOS:A1994NA98500010 ER PT J AU DESILVA, MJ PEDRAZA, AJ LOWNDES, DH AF DESILVA, MJ PEDRAZA, AJ LOWNDES, DH TI ELECTROLESS COPPER-FILMS DEPOSITED ONTO LASER-ACTIVATED ALUMINUM NITRIDE AND ALUMINA SO JOURNAL OF MATERIALS RESEARCH LA English DT Article AB Metallization of ceramic substrates by laser activation and subsequent electroless deposition has been demonstrated recently in aluminum nitride and alumina. However, the bond strength between the electroless copper and the ceramic substrate is weak (less than 14 MPa). Low temperature annealing of electroless copper films deposited on substrates activated at low laser energies strongly increases the adhesion strength. The effectiveness of the annealing for improving the metal-ceramic bonding is dependent upon the laser treatment performed on the substrate prior to deposition. Faster deposition kinetics are obtained for both substrates by increasing the laser energy density. On the other hand, an increase in the laser energy density leads to poor adhesion strengths. The dislocation microstructure produced during laser irradiation in aluminum nitride is analyzed as a possible cause of laser activation. Free aluminum produced by laser irradiation of aluminum nitride and of alumina is discussed as another factor of laser activation. The chemical and microstructural changes taking place in the near-surface region as a consequence of laser-induced processes are correlated with adhesion enhancement promoted by the annealing treatment. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP DESILVA, MJ (reprint author), UNIV TENNESSEE,DEPT MAT SCI & ENGN,KNOXVILLE,TN 37996, USA. NR 18 TC 32 Z9 33 U1 0 U2 4 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD APR PY 1994 VL 9 IS 4 BP 1019 EP 1027 DI 10.1557/JMR.1994.1019 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA NA985 UT WOS:A1994NA98500027 ER PT J AU LEE, EH RAO, GR LEWIS, MB MANSUR, LK AF LEE, EH RAO, GR LEWIS, MB MANSUR, LK TI EFFECTS OF ELECTRONIC AND RECOIL PROCESSES IN POLYMERS DURING ION-IMPLANTATION SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID WEAR PROPERTIES; IRRADIATION; HARDNESS; CONDUCTIVITY; POLYSTYRENE; KAPTON; FILMS AB It has been shown that ion implantation produces remarkable improvements in surface-sensitive mechanical properties, as well as other physical and chemical properties in polymers. To understand mechanisms underlying such property changes, various polymeric materials were subjected to bombardment by energetic ions in the range of 200 keV to 2 MeV. The magnitude of property changes is strongly dependent upon ion species, energy, and dose. Analysis indicated that hardness and electrical conductivity increased by employing ion species with larger electronic cross sections and with increasing ion energy and dose. The results showed that electronic stopping or linear energy transfer (LET, energy deposited per unit track length per ion) for ionization was the most important factor for the enhancement of hardness, while nuclear stopping or linear energy transfer for displacement generally appeared to reduce hardness. RP LEE, EH (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 35 TC 88 Z9 90 U1 1 U2 5 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 APR PY 1994 VL 9 IS 4 BP 1043 EP 1050 DI 10.1557/JMR.1994.1043 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA NA985 UT WOS:A1994NA98500030 ER PT J AU HSUEH, CH AF HSUEH, CH TI CONSIDERATION OF RADIAL DEPENDENCES OF AXIAL STRESSES IN THE SHEAR-LAG MODEL FOR FIBER PULL-OUT SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID FIBER-REINFORCED COMPOSITES; CERAMIC-MATRIX COMPOSITES; PUSHOUT TESTS; FRICTION; STRENGTH; GLASS AB The shear-lag model has been used extensively to analyse stress transfer during single-fibre pull-out. To achieve analytical solutions, the radial dependences of the axial stresses in the fibre and the matrix are generally ignored in the shear-lag model. The present study considered these radial dependence in the shear-lag model. The differences between the predictions obtained by ignoring these radial dependences, considering the radial dependence of the axial stress in the fibre only, considering the radial dependence of the axial stress in the matrix only, and considering both radial dependences, have been addressed. 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 30 TC 9 Z9 9 U1 0 U2 3 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 APR 1 PY 1994 VL 29 IS 7 BP 1801 EP 1806 DI 10.1007/BF00351299 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA NF717 UT WOS:A1994NF71700016 ER PT J AU HESS, NJ MAUPIN, GD CHICK, LA SUNBERG, DS MCCREEDY, DE ARMSTRONG, TR AF HESS, NJ MAUPIN, GD CHICK, LA SUNBERG, DS MCCREEDY, DE ARMSTRONG, TR TI SYNTHESIS AND CRYSTALLIZATION OF YTTRIUM-ALUMINUM-GARNET AND RELATED-COMPOUNDS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article AB Amorphous oxide combustion products with compositions corresponding to Y4Al2O9, YAlO3, and Y3Al5O12 were synthesized by the glycine-nitrate process and heat-treated to induce crystallization. The crystalline structure of the resulting powders was determined by powder X-ray diffraction techniques. The phase stabilities of the crystalline phases were investigated as functions of the glycine-to-nitrate ratio, the yttrium-to-aluminium ratio, and the heat-treatment conditions. Heat treatment for short durations resulted in incompletely crystalline powders that consisted of a mixture of Y4Al2O9, YAlO3, and Y3Al5O12 phases, regardless of the chemical composition of the amorphous combustion product. However, heat treatment for longer durations or higher temperature generated both pure-phase, monoclinic Y4Al2O9 and Y3Al5O12 with the garnet structure. Prolonged heat treatment at high temperature failed to generate pure-phase orthorhombic YAlO3. Subsequent analysis revealed a sluggish, complex crystallization process involving the formation and decomposition of several phases. RP HESS, NJ (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. OI Hess, Nancy/0000-0002-8930-9500 NR 30 TC 75 Z9 76 U1 3 U2 16 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 APR 1 PY 1994 VL 29 IS 7 BP 1873 EP 1878 DI 10.1007/BF00351307 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA NF717 UT WOS:A1994NF71700024 ER PT J AU VARMA, HK MANI, TV WARRIER, KGK DAMODARAN, AD BALACHANDRAN, U AF VARMA, HK MANI, TV WARRIER, KGK DAMODARAN, AD BALACHANDRAN, U TI SINTERING OF THIN SHEETS OF ALUMINA PREPARED BY THE SOL-SPRAY TECHNIQUE SO JOURNAL OF MATERIALS SCIENCE LETTERS LA English DT Article ID GELS C1 ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439. RP VARMA, HK (reprint author), CSIR,REG RES LAB,THIRUVANANTHAPURAM 695019,INDIA. RI TVM, NIIST/E-5132-2012 OI TVM, NIIST/0000-0002-5814-466X NR 12 TC 2 Z9 2 U1 0 U2 0 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0261-8028 J9 J MATER SCI LETT JI J. Mater. Sci. Lett. PD APR 1 PY 1994 VL 13 IS 7 BP 491 EP 493 DI 10.1007/BF00540176 PG 3 WC Materials Science, Multidisciplinary SC Materials Science GA NF715 UT WOS:A1994NF71500008 ER PT J AU SHATTUCK, MB GUSTAFSSON, MGL FISHER, KA YANAGIMOTO, KC VEIS, A BHATNAGAR, RS CLARKE, J AF SHATTUCK, MB GUSTAFSSON, MGL FISHER, KA YANAGIMOTO, KC VEIS, A BHATNAGAR, RS CLARKE, J TI MONOMERIC COLLAGEN IMAGED BY CRYOGENIC FORCE MICROSCOPY SO JOURNAL OF MICROSCOPY-OXFORD LA English DT Note ID LOW-TEMPERATURE C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF SAN FRANCISCO,BIOENGN GRP,SAN FRANCISCO,CA 94143. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,MSD,CTR ADV MAT,BERKELEY,CA 94720. UNIV CALIF SAN FRANCISCO,DEPT ANAT,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT BIOCHEM,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,FRANCIS I PROCTOR FDN,SAN FRANCISCO,CA 94143. NORTHWESTERN UNIV,CONNECT TISSUE RES LABS,CHICAGO,IL 60611. NR 8 TC 19 Z9 19 U1 1 U2 2 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0022-2720 J9 J MICROSC-OXFORD JI J. Microsc.-Oxf. PD APR PY 1994 VL 174 BP RP1 EP RP2 PN 1 PG 2 WC Microscopy SC Microscopy GA NG699 UT WOS:A1994NG69900009 PM 8207747 ER PT J AU YEH, LI LEE, YT HOUGEN, JT AF YEH, LI LEE, YT HOUGEN, JT TI VIBRATION-ROTATION SPECTROSCOPY OF THE HYDRATED HYDRONIUM IONS H5O2+ AND H9O4+ SO JOURNAL OF MOLECULAR SPECTROSCOPY LA English DT Article ID FAR INFRARED-SPECTRUM; WATER DIMER; TUNNELING SPECTRUM; MICROWAVE-SPECTRUM; HYDRAZINE; CARBODIIMIDE; DYNAMICS; HNCNH; H2O2 AB High-resolution vibration-rotation spectra in the OH antisymmetric stretching region near 3700 cm(-1) are reported for H5O2+ and H9O4+. The clusters are produced in a corona discharge ion source, cooled by supersonic expansion, mass-selected, and trapped in an RF octopole ion trap. Spectroscopic interrogation using a two-color laser scheme leads to rovibrational excitation of the trapped ions followed by preferential multiphoton dissociation of the vibrationally excited ions and detection of the resultant fragment ions. Many more lines appear in the partially resolved vibration-rotation spectrum of H5O2+ than can be explained if the molecule is rigid, and we have assumed that these additional lines arise from tunneling splittings caused by large-amplitude internal motions in this ion. Despite the low signal-to-noise ratio, all the observed spectral features can be grouped into roughly 12 R branches with a line spacing only 14% less than the B + C value calculated from the ab initio structure. Theoretically expected splitting patterns were calculated using a formalism developed earlier for tunneling motions in hydrazine, since H2N-NH2 and H2O-H+-OH2 are group-theoretically similar if the central proton of the ion is located symmetrically between the two water molecules. We tentatively conclude that the 12 branches represent the overlapping of six tunneling-split components for the in-phase and six for the out of-phase OH antisymmetric stretching vibrations expected in this region, but the low signal-to-noise ratio in the present measurements prevented unambiguous comparison of theory and experiment. (C) 1994 Academic Press, Inc. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. NIST,DIV MOLEC PHYS,GAITHERSBURG,MD 20899. RP YEH, LI (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. RI Lee, Yuan-Tseh/F-7914-2012 NR 45 TC 66 Z9 66 U1 0 U2 9 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-2852 J9 J MOL SPECTROSC JI J. Mol. Spectrosc. PD APR PY 1994 VL 164 IS 2 BP 473 EP 488 DI 10.1006/jmsp.1994.1090 PG 16 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA NC819 UT WOS:A1994NC81900014 ER PT J AU YAMADA, R ZINKLE, SJ PELLS, GP AF YAMADA, R ZINKLE, SJ PELLS, GP TI MICROSTRUCTURE OF AL2O3 AND MGAL2O4 PREIMPLANTED WITH H, HE, C AND IRRADIATED WITH AR+ IONS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID TRANSMUTATION PRODUCTS; MAGNESIUM ALUMINATE; CERAMICS; DAMAGE; BOMBARDMENT; FUSION AB Polycrystalline alumina (Al2O3) and spinel (MgAl2O4) were irradiated under three different sets of ion irradiation conditions in order to examine the effects of displacement damage and transmutation product formation on their microstructural evolution. Specimens were implanted with H, He and C alone, or irradiated with 4 MeV Ar+ ions alone, or preimplanted with H, He, C and subsequently irradiated with 4 MeV Ar+ ions. The irradiated specimens were observed with transmission electron microscopy following irradiation to damage levels of 0.6-30 dpa at 260-810-degrees-C. In both spinel and alumina, no radiation effects were observable in specimens implanted with H, He and C alone, and the preinjected species did not have a significant effect on dislocation loop size or density in Ar+ irradiated specimens. In alumina, cavities were formed in all of the observed Ar+ irradiated specimens for both the preimplanted H, He and C case and the Ar+ alone case. In spinel, cavity formation was only observed in preimplanted specimens irradiated with Ar+ ions at relatively high temperatures and/or doses. Grain boundary cracking and cavity alignment was observed in the near-surface regions of Al2O3, apparently due to stresses associated with cavity swelling. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. HARWELL LAB,DIDCOT OX11 0RA,OXON,ENGLAND. RP YAMADA, R (reprint author), JAPAN ATOM ENERGY RES INST,TOKAI,IBARAKI 31911,JAPAN. OI Zinkle, Steven/0000-0003-2890-6915 NR 28 TC 15 Z9 15 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD APR PY 1994 VL 209 IS 2 BP 191 EP 203 DI 10.1016/0022-3115(94)90295-X PG 13 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA NG404 UT WOS:A1994NG40400011 ER PT J AU ALEXANDER, DE REHN, LE AF ALEXANDER, DE REHN, LE TI THE CONTRIBUTION OF HIGH-ENERGY GAMMA-RAYS TO DISPLACEMENT DAMAGE IN LWR PRESSURE-VESSELS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Letter RP ALEXANDER, DE (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 13 TC 16 Z9 16 U1 0 U2 1 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 APR PY 1994 VL 209 IS 2 BP 212 EP 214 DI 10.1016/0022-3115(94)90297-6 PG 3 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA NG404 UT WOS:A1994NG40400013 ER PT J AU KOPP, OC FULLER, EL CAVIN, OB AF KOPP, OC FULLER, EL CAVIN, OB TI OXIDIZED RESIDUES FROM 2020 GRAPHITE SO JOURNAL OF NUCLEAR MATERIALS LA English DT Letter C1 UNIV TENNESSEE,KNOXVILLE,TN 37996. RP KOPP, OC (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD APR PY 1994 VL 209 IS 2 BP 215 EP 219 DI 10.1016/0022-3115(94)90298-4 PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA NG404 UT WOS:A1994NG40400014 ER PT J AU CHEN, G HAIRE, RG PETERSON, JR ABRAHAM, MM AF CHEN, G HAIRE, RG PETERSON, JR ABRAHAM, MM TI A LUMINESCENCE STUDY OF EUVO4 AT HIGH-PRESSURE SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE HIGH PRESSURE; LUMINESCENCE SPECTROSCOPY; PHASE TRANSITION ID INDUCED PHASE-TRANSITION; ABSORPTION; ZIRCON; RAMAN AB The pressure dependence of the luminescence from the F-7(1,2) <-- 5D0 transitions of Eu3+ ion in EuVO4 has been investigated to 5.6 GPA using a diamond anvil cell. At ambient pressure two of the F-7(1) <-- 5D0 transitions are degenerate in the zircon-type phase of EuVO4; however this degeneracy is removed with the application of pressure (greater-than-or-equal-to 0.8 GPA). Abrupt changes in the luminescence spectrum from the Eu3+ ion were observed at 4.5 GPA, which remained even after removal of pressure, indicating that a pressure-induced, irreversible phase transition had occurred. The Eu3+ ion luminescence spectrum from the high-pressure, scheelite-type phase of EuVO4 exhibited the characteristics of a distorted D2d symmetry instead of the S4 site symmetry determined from the results of X-ray diffraction analysis. The effect of pressure on the energy levels of the Eu3+ ion in EuVO4 is discussed. C1 OAK RIDGE NATL LAB,DIV CHEM,TRANSURANIUM RES LAB,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP CHEN, G (reprint author), UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996, USA. NR 13 TC 16 Z9 16 U1 1 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 APR PY 1994 VL 55 IS 4 BP 313 EP 316 DI 10.1016/0022-3697(94)90227-5 PG 4 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA NN241 UT WOS:A1994NN24100002 ER PT J AU KRUMPELT, M KUMAR, R MYLES, KM AF KRUMPELT, M KUMAR, R MYLES, KM TI FUNDAMENTALS OF FUEL-CELL SYSTEM INTEGRATION SO JOURNAL OF POWER SOURCES LA English DT Article; Proceedings Paper CT 3rd Grove Fuel Cell Symposium: The Science, Engineering and Practice of Fuel Cells CY SEP 28-OCT 01, 1993 CL IMPERIAL COLL, LONDON, ENGLAND SP ELSEVIER SCI LTD HO IMPERIAL COLL AB Fuel cells are theoretically very efficient energy conversion devices that have the potential of becoming a commercial product for numerous uses in the civilian economy. We have analyzed several fuel cell system designs with regard to thermal and chemical integration of the fuel cell stack into the rest of the system. Thermal integration permits the use of the stack waste heat for the endothermic steps of fuel reforming. Chemical integration provides the steam needed for fuel reforming from the water produced by the electrochemical cell reaction. High-temperature fuel cells, such as the molten carbonate and the solid oxide fuel cells, permit this system integration in a relatively simple manner. Lower temperature fuel cells, such as the polymer electrolyte and phosphoric acid systems, require added system complexity to achieve such integration. The system economics are affected by capital and fuel costs and technical parameters, such as electrochemical fuel utilization, current density, and system complexity. At today's low fuel prices and the high fuel cell costs (in part, because of the low rates of production of the early prototypes), fuel cell systems are not cost competitive with conventional power generation. With the manufacture and sale of larger numbers of fuel cell systems, the total costs will decrease from the current several thousand dollars per kW, to perhaps less than US$ 100 per kW as production volumes approach a million units per year. RP KRUMPELT, M (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 15 TC 15 Z9 17 U1 1 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0378-7753 J9 J POWER SOURCES JI J. Power Sources PD APR PY 1994 VL 49 IS 1-3 BP 37 EP 51 DI 10.1016/0378-7753(93)01794-I PG 15 WC Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Energy & Fuels; Materials Science GA NP061 UT WOS:A1994NP06100004 ER PT J AU PATIL, P ZEGERS, P AF PATIL, P ZEGERS, P TI FUEL-CELL ROAD TRACTION - AN OPTION FOR A CLEAN GLOBAL SOCIETY SO JOURNAL OF POWER SOURCES LA English DT Article; Proceedings Paper CT 3rd Grove Fuel Cell Symposium: The Science, Engineering and Practice of Fuel Cells CY SEP 28-OCT 01, 1993 CL IMPERIAL COLL, LONDON, ENGLAND SP ELSEVIER SCI LTD HO IMPERIAL COLL AB Government and industry around the globe are currently faced with the challenge of meeting a rapidly growing demand for transportation services while minimizing the adverse energy and environmental impacts. Within the last decade, fuel cells have emerged as one of the most promising technologies to meet this challenge (by potentially replacing the internal combustion engine in all areas of ground transportation). Accordingly, both the USA and the European Community have assigned a high priority to the research and development of fuel cell technology and, in collaboration with the private sector, have established a wide range of programs to accelerate the development and commercialization of fuel cells for transportation. This paper discusses the development plans and strategies of the USA and the European Community, the progress achieved to date, and the potential of fuel cells to contribute to a successful transition towards a clean global society. C1 COMMISS EUROPEAN COMMUNITIES,ENERGY CONVERS RES & DEV COMM,B-1049 BRUSSELS,BELGIUM. RP PATIL, P (reprint author), US DOE,FUEL CELL SYST RES & DEV,WASHINGTON,DC 20585, USA. NR 8 TC 11 Z9 12 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0378-7753 J9 J POWER SOURCES JI J. Power Sources PD APR PY 1994 VL 49 IS 1-3 BP 169 EP 184 DI 10.1016/0378-7753(93)01810-5 PG 16 WC Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Energy & Fuels; Materials Science GA NP061 UT WOS:A1994NP06100013 ER PT J AU ROBINSON, L DYER, FF COMBS, DW WADE, JW TEASLEY, NA CARLTON, JE ONDRACEK, AL STOKELY, JR AF ROBINSON, L DYER, FF COMBS, DW WADE, JW TEASLEY, NA CARLTON, JE ONDRACEK, AL STOKELY, JR TI DETERMINATION OF HG AND OTHER TRACE-ELEMENTS IN SOIL USING NEUTRON-ACTIVATION ANALYSIS SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Article AB In the early 1950's, a federal facility in Oak Ridge, Tennessee, used a process that required the use of Hg to produce Li-8. It was disclosed to the public in 1983 that about 2.4 millions pounds of Hg had been released into the ecosystem. The primary route of mercury into the environment was a stream. East Fork Poplar Creek, whose head waters are in the vicinity of the plant. As part of a study to determine the distribution of Hg as well as As, Cr, Sb, Se, U, and Zn along the flood plains of the creek, a procedure using neutron activation analysis was developed and is described below. The procedure, typical sample analysis results for Hg, and quality assurance and control data are discussed in this paper. C1 OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831. SCI APPLICAT INT CORP,AOK RIDGE,TN. OAK RIDGE RES INST,OAK RIDGE,TN. PURDUE UNIV,DEPT CHEM,W LAFAYETTE,IN 47907. NR 3 TC 8 Z9 9 U1 0 U2 0 PU AKADEMIAI KIADO PI BUDAPEST PA PO BOX 245, H-1519 BUDAPEST, HUNGARY SN 0236-5731 J9 J RADIOAN NUCL CH AR JI J. Radioanal. Nucl. Chem.-Artic. PD APR PY 1994 VL 179 IS 2 BP 305 EP 313 DI 10.1007/BF02040165 PG 9 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA NP721 UT WOS:A1994NP72100014 ER PT J AU GULOY, AM CORBETT, JD AF GULOY, AM CORBETT, JD TI EXPLORATION OF THE INTERSTITIAL DERIVATIVES OF LA5PB3 (MN3SI3-TYPE) SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article ID POLAR INTERMETALLIC COMPOUNDS; CHEMISTRY; PHASES; ZR5SB3; ZR4SN AB Powder sintering reactions of the elements or of appropriate binary phases in welded Ta containers have resulted in the single phase syntheses of 17 La5Pb3Z derivatives of La5Pb3 with stuffed Mn5Si3-type structures (P6(3)/mcm), namely, Z = B(x), C(x), P, S, Cl, As, Se, Sb, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ru, and Ag. (Z = N, O form a Cr5B3-type derivative.) Possible x values for B and C are consistent with, but not proof of, Zintl phase characteristics. La5Pb3 was shown to be a line phase, while the reported binary LA4P3 (anti-Th3P4) was not found. The volume changes observed on incorporation of Z into La5Pb3 are the smallest found in this sort of system except for chloride in the even more weakly bound alkaline-earth-metal-pnictide analogues. (C) 1994 Academic Press, Inc. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP GULOY, AM (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 23 TC 27 Z9 27 U1 3 U2 7 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 APR PY 1994 VL 109 IS 2 BP 352 EP 358 DI 10.1006/jssc.1994.1114 PG 7 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA NG892 UT WOS:A1994NG89200021 ER PT J AU SMITH, JL BROOKS, JS FOWLER, CM FREEMAN, BL GOETTEE, JD HULTS, WL KING, JC MANKIEWICH, PM DEOBALDIA, EI OMALLEY, ML RICKEL, DG SKOCPOL, WJ AF SMITH, JL BROOKS, JS FOWLER, CM FREEMAN, BL GOETTEE, JD HULTS, WL KING, JC MANKIEWICH, PM DEOBALDIA, EI OMALLEY, ML RICKEL, DG SKOCPOL, WJ TI LOW-TEMPERATURE CRITICAL-FIELD OF YBCO SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE YBCO; HIGH FIELD; CRITICAL FIELD; RESISTANCE ID SINGLE-CRYSTALS AB We have measured the upper critical field H(C2)(T) of YBa2Cu3O7 (YBCO) thin films in magnetic fields up to 140 T for H applied parallel to the c-axis of the film. The critical field in the zero-temperature limit is 138 T, and the temperature dependence does not fit any simple model. C1 BOSTON UNIV,BOSTON,MA 02215. AT&T BELL LABS,HOLMDEL,NJ 07733. RP SMITH, JL (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Goettee, Jeffrey/L-4926-2015 NR 11 TC 11 Z9 11 U1 1 U2 3 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD APR PY 1994 VL 7 IS 2 BP 269 EP 270 DI 10.1007/BF00724550 PG 2 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NM851 UT WOS:A1994NM85100002 ER PT J AU MOSLEY, WD LAN, MD STERNE, PA HOWELL, RH SHELTON, RN AF MOSLEY, WD LAN, MD STERNE, PA HOWELL, RH SHELTON, RN TI CORRELATION OF MAGNETIC-PROPERTIES TO OXYGEN AND POTASSIUM STOICHIOMETRY IN SINGLE-CRYSTAL BA1-XKXBIO3-Y SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE BA1-XKXBIO3-Y; SINGLE-CRYSTAL; OXYGEN ID SUPERCONDUCTIVITY; SYSTEM AB Recent theoretical calculations have suggested the coupling of electrons to high-energy oxygen phonons as an explanation of superconductivity in the Ba1-xKxBiO3-y SYStem. We have synthesized high-quality single crystals of the material and have examined the behaviors of critical field and critical current parameters as a function of changes in the oxygen content and in the Ba/K ratio. We have determined, via positron lifetime spectroscopy and single crystal X-ray measurements, that the oxygen stoichiometry in this system can be varied without significant impact on the metal atom sublattice. These results facilitate an investigation of the dependence of critical parameters on dopant and defect levels in this system. C1 LAWRENCE LIVERMORE NATL LAB,DEPT CHEM,LIVERMORE,CA 94551. LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94551. RP MOSLEY, WD (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD APR PY 1994 VL 7 IS 2 BP 299 EP 301 DI 10.1007/BF00724557 PG 3 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NM851 UT WOS:A1994NM85100009 ER PT J AU WOLF, EL CHANG, A RONG, ZY IVANCHENKO, YM LU, FR AF WOLF, EL CHANG, A RONG, ZY IVANCHENKO, YM LU, FR TI DIRECT STM MAPPING OF THE SUPERCONDUCTING ENERGY-GAP IN SINGLE-CRYSTAL BI2SR2CACU2O8+X SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE ENERGY GAP; SCANNING TUNNELING MICROSCOPE; HIGH-TEMPERATURE SUPERCONDUCTOR; SPATIAL VARIATION ID COPPER-OXIDE SUPERCONDUCTORS; CRITICAL CURRENTS; TC; PHOTOEMISSION; SPECTROSCOPY; ANISOTROPY; INTRALAYER; SPECTRUM; PLANE; STATE AB Scanning tunneling spectroscopy applied to BiO cleavage planes of 90 K T(c) BSCCO 2212 at 4.2 K simultaneously provides topography and local dI/dV spectra (superconducting DOS). The spectra, which are similar to recent photoemission spectra, confirm a large gap parameter DELTA(x, y) associated with an apparently gapless DOS on the uppermost layer. Transverse spatial variations of DELTA on a 100 angstrom scale are attributed to variations in BiO metallicity, presumably originating in oxygen stoichiometry variations in an unannealed crystal. We identify two characteristic dI/dV spectral shapes with regions of metallic and nonmetallic BiO layers, and can relate these by the McMillan model of the superconducting proximity effect. A sharply peaked spectral shape, similar to that observed in photoemission, is predicted for the metallic BiO layer induced superconducting by its proximity to the underlying CuO2 planes. The short mean free path and short coherence length imply that both tunneling and photoemission spectra are heavily weighted toward contributions from the BiO layer in fully metallic 2212. The present results and analysis thus suggest that the superconducting proximity effect influences the lineshapes seen by both techniques. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP WOLF, EL (reprint author), POLYTECH INST NEW YORK,DEPT PHYS,BROOKLYN,NY 11201, USA. NR 31 TC 22 Z9 22 U1 1 U2 4 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD APR PY 1994 VL 7 IS 2 BP 355 EP 360 DI 10.1007/BF00724568 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NM851 UT WOS:A1994NM85100020 ER PT J AU LEVY, M LI, ZX SARMA, BK SALEMSUGUI, S SHI, DL AF LEVY, M LI, ZX SARMA, BK SALEMSUGUI, S SHI, DL TI BCS TEMPERATURE-DEPENDENT SUPERCONDUCTING ENERGY-GAP IN DOMAIN BOUNDARIES OF MELT-TEXTURED YBA2CU3O7 SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE ULTRASONIC ATTENUATION; WEAK LINKS; ENERGY GAP; MIXED STATE ID HIGH-TC SUPERCONDUCTORS; UPT3 AB Attenuation and velocity measurements in low magnetic fields in the superconducting state of a melt-textured sample of YBa2Cu3O7 are reported. Changes in both attenuation alpha and relative velocity dv/v are observed at the penetration field H(c1)' of its domain boundaries. The change in dv/v at H(c1)' appears to be proportional to the repulsive force between vortices. The change in alpha at H(c1)' may be produced by a relaxation process involving superconducting quasiparticles in the vicinity of the normal core of the vortices. Analysis of the relaxation time associated with this process yields a temperature-dependent energy gap which follows the BCS dependence. The relaxation time associated with the process is about 10(-11) sec. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP LEVY, M (reprint author), UNIV WISCONSIN,DEPT PHYS,MILWAUKEE,WI 53201, USA. NR 19 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD APR PY 1994 VL 7 IS 2 BP 409 EP 414 DI 10.1007/BF00724578 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NM851 UT WOS:A1994NM85100030 ER PT J AU KLEIN, N TELLMANN, N WOLF, SA KRESIN, VZ AF KLEIN, N TELLMANN, N WOLF, SA KRESIN, VZ TI MICROWAVE SURFACE IMPEDANCE OF YBA2CU3O7-X - S-WAVE VERSUS D-WAVE PAIRING SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE HIGH-TEMPERATURE SUPERCONDUCTIVITY; SURFACE IMPEDANCE; PAIRING STATE ID PENETRATION DEPTH MEASUREMENTS; THIN-FILMS; SUPERCONDUCTORS; LOSSES AB The low temperature behavior of the microwave surface resistance R(s) and the penetration provides information on the pairing state. Fully oxygenated films with low dc-resistivity in the normal state exhibit an exponential temperature dependence corresponding to values of the energy gap up to 10 meV. For oxygen deficient films a linear R(s)(T) was observed, similar to single crystals. This can be explained qualitatively by induced superconductivity in the copper-oxygen chains. C1 USN,RES LAB,WASHINGTON,DC 20375. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP KLEIN, N (reprint author), FORSCHUNGSZENTRUM JULICH GMBH,INST FESTKORPERFORSCH,D-52425 JULICH,GERMANY. RI Wolf, Stuart/A-7513-2009; Klein, Norbert/C-1473-2017 NR 14 TC 15 Z9 15 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD APR PY 1994 VL 7 IS 2 BP 459 EP 461 DI 10.1007/BF00724589 PG 3 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NM851 UT WOS:A1994NM85100041 ER PT J AU HERMANN, AM YANDROFSKI, RM SCOTT, JF NAZIRIPOUR, A GALT, D PRICE, JC CUCHARIO, J AHRENKIEL, RK AF HERMANN, AM YANDROFSKI, RM SCOTT, JF NAZIRIPOUR, A GALT, D PRICE, JC CUCHARIO, J AHRENKIEL, RK TI OXIDE SUPERCONDUCTORS AND FERROELECTRICS - MATERIALS FOR A NEW-GENERATION OF TUNABLE MICROWAVE DEVICES SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE TL-BA-CA-CU-O SUPERCONDUCTORS; HTSC FERROELECTRIC TUNABLE MICROWAVE DEVICES; HTSC/FERROELECTRIC MULTILAYER STRUCTURES ID THIN-FILMS AB We describe materials deposition and characterization for a broad class of tunable microwave devices using high-temperature oxide superconductor and voltage-tunable oxide ferroelectric thin-film multilayer structures. Tl-Ba-Ca-Cu-O thin films deposited by sputtering or e-beam evaporation were patterned into microwave resonators. each consisting of two colinear microstrip line sections separated by a 5-20 mum gap. A Ba0.1Sr0.9TiO3 (BST) layer was then over-coated to fill the gap. The relative dielectric constant of the BST films deposited by physical vapor or chemical techniques was measured at 77 K in the 1-10 MHz range and found to vary by up to a factor of 2 or more with voltage bias in test capacitor structures using Pt electrodes. In the BST (variable capacitor)-HTSC microwave resonator structures, the change of the relative dielectric constant of the BST under voltage bias has allowed variation of the fundamental frequency of up to 80 MHz in the 5-10 GHz range at. 4 K. Film deposition by various techniques and associated structural, morphological, and electronic properties, as well as materials compatibility issues, are discussed. C1 SYMETRIX CORP,COLORADO SPRINGS,CO. NATL RENEWABLE ENERGY LAB,GOLDEN,CO. RP HERMANN, AM (reprint author), UNIV COLORADO,BOULDER,CO 80309, USA. NR 11 TC 37 Z9 37 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD APR PY 1994 VL 7 IS 2 BP 463 EP 469 DI 10.1007/BF00724590 PG 7 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NM851 UT WOS:A1994NM85100042 ER PT J AU CANDY, JV SULLIVAN, EJ AF CANDY, JV SULLIVAN, EJ TI MODEL-BASED PROCESSOR DESIGN FOR A SHALLOW-WATER OCEAN ACOUSTIC EXPERIMENT SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID LOCALIZATION AB Model-based signal processing is a well-defined methodology enabling the inclusion of environmental (propagation) models, measurement (sensor arrays) models, and noise (shipping, measurement) models into a sophisticated processing algorithm. Depending on the class of model developed from the mathematical representation of the physical phenomenology, various processors can evolve. Here the design of a space-varying, nonstationary, model-based processor (MBP) is investigated and applied to the data from a well-controlled shallow water experiment performed at Hudson Canyon. This particular experiment is very attractive for the inaugural application of the MBP because it was performed in shallow water at low frequency requiring a small number of modes. In essence, the Hudson Canyon represents a well-known ocean environment, making it ideal for this investigation. In this shallow water application, a state-space representation of the normal-mode propagation model is used. The processor is designed such that it allows in situ recursive estimation of both the pressure-field and modal functions. It is shown that the MBP can be effectively utilized to ''validate'' the performance of the model on noisy ocean acoustic data. In fact, a set of processors is designed, one for each source range and the results are quite good-implying that the propagation model with measured parameters adequately represents the data. C1 USN,CTR UNDERSEA WARFARE,NEWPORT,RI 02841. RP CANDY, JV (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5504,LIVERMORE,CA 94550, USA. NR 36 TC 12 Z9 14 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD APR PY 1994 VL 95 IS 4 BP 2038 EP 2051 DI 10.1121/1.408667 PG 14 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA NF019 UT WOS:A1994NF01900033 ER PT J AU FISHER, DA WRIGHT, TL AF FISHER, DA WRIGHT, TL TI PRURITUS AS A SYMPTOM OF HEPATITIS-C SO JOURNAL OF THE AMERICAN ACADEMY OF DERMATOLOGY LA English DT Note ID NON-B-HEPATITIS; PRIMARY BILIARY-CIRRHOSIS; NON-A; VIRUS-INFECTION; VIRAL-HEPATITIS; POSTTRANSFUSION HEPATITIS; CUTANEOUS VASCULITIS; GENERALIZED PRURITUS; LIVER-DISEASE; BILE-ACIDS AB Recent isolation, cloning, and sequencing of the hepatitis C genome, which has led to the development of an enzyme-linked immunosorbent assay, has produced increasing recognition of a hepatic disease that frequently leads to potentially lethal, chronic active hepatitis. We describe four patients who had pruritus or in whom pruritus developed as a consequence of hepatitis C. The symptom of pruritus should be added to a growing list of cutaneous manifestations of this newly recognized inflammatory viral hepatitis. C1 UNIV CALIF SAN FRANCISCO,SCH MED,SAN FRANCISCO,CA. LAWRENCE LIVERMORE NATL LAB,SCH MED,DAVIS,CA 95616. UNIV CALIF SAN FRANCISCO,MED CTR,SAN FRANCISCO,CA 94143. NR 56 TC 34 Z9 34 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0190-9622 J9 J AM ACAD DERMATOL JI J. Am. Acad. Dermatol. PD APR PY 1994 VL 30 IS 4 BP 629 EP 632 PG 4 WC Dermatology SC Dermatology GA NE852 UT WOS:A1994NE85200016 PM 7710472 ER PT J AU DING, JL LIU, KC MORE, KL BRINKMAN, CR AF DING, JL LIU, KC MORE, KL BRINKMAN, CR TI CREEP AND CREEP-RUPTURE OF AN ADVANCED SILICON-NITRIDE CERAMIC SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID HOT-PRESSED SI3N4; STRENGTH; TENSILE; GLASS; PHASE; Y2O3 AB Creep and creep rupture behavior of an advanced silicon nitride ceramic were systematically characterized in the temperature range 1150-degrees to 1300-degrees-C using uniaxial tensile creep tests. Absence of tertiary creep and the order-of-magnitude breaks in both creep rate and rupture lifetime at certain threshold combinations of stress and temperature were two characteristic features of the creep behavior observed. Thermal annealing was found to have enhanced both subsequent creep resistance and creep rupture life. The stress exponent (n) and the activation energy (Q) defined in the Norton relation were found to be 12.6 and 1645 kJ/mol for the material investigated. Both values appear to fall in the general range of those reported for other but similar types of Si3N4 ceramic materials. The stress exponent, m, equivalent to the slope of the Larson-Miller equation was found to be in the range 13 to 14.4, and that defined as p in the Monkman-Grant relation to be 0.91, based on the available experimental data. The values of m, n, and p obtained above approximately support the interrelationship of the three exponents given by p = m/n. C1 WASHINGTON STATE UNIV,DEPT MECH & MAT ENGN,PULLMAN,WA 99164. RP DING, JL (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. RI More, Karren/A-8097-2016 OI More, Karren/0000-0001-5223-9097 NR 31 TC 37 Z9 39 U1 2 U2 2 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD APR PY 1994 VL 77 IS 4 BP 867 EP 874 DI 10.1111/j.1151-2916.1994.tb07241.x PG 8 WC Materials Science, Ceramics SC Materials Science GA NG916 UT WOS:A1994NG91600001 ER PT J AU ZUTSHI, A HABER, RA NIESZ, DE ADAMS, JW WACHTMAN, JB FERBER, MK HSU, SM AF ZUTSHI, A HABER, RA NIESZ, DE ADAMS, JW WACHTMAN, JB FERBER, MK HSU, SM TI PROCESSING, MICROSTRUCTURE, AND WEAR BEHAVIOR OF SILICON-NITRIDE HOT-PRESSED WITH ALUMINA AND YTTRIA SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID FRACTURE ENERGY; STRENGTH; SI3N4; TOUGHNESS; MECHANISM; WATER AB Commercial silicon nitride powder with Al2O3 and Y2O3 additives was hot-pressed to complete density. The resulting microstructure contained elongated grains with no trace of remaining alpha-Si3N4. The aspect ratio of the elongated grains increased with increasing soak time at a fixed hot-pressing temperature. X-ray diffraction analysis showed that the crystalline phase in the hot-pressed samples was beta-sialon (Si6-zAlzOzN8-z) with z values that increased with soak time. The fracture strength and fracture toughness of the samples increased as the aspect ratio of the grains increased. The Vickers hardness decreased slightly as the soak time was increased, which was attributed to a grain size effect. Wear tests of silicon nitride against silicon nitride were conducted on a reciprocating pin-on-disk apparatus with paraffin oil as a lubricant. Correlation studies of wear with microstructure and mechanical properties were performed. The wear rate increased rapidly with increasing soak time in spite of the increased strength and toughness. This was attributed to increased third-body wear caused by pullout of pieces from the wear surface. The pullout mechanism was not conclusively identified. However, TEM examination showed clear evidence of dislocation motion under the wear scar. Grain boundary microstresses caused by the anisotropic thermal expansion and elastic properties of the elongated grains may have contributed to the observed pullout. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP ZUTSHI, A (reprint author), RUTGERS UNIV STATE,CTR CERAM RES,PISCATAWAY,NJ 08855, USA. NR 47 TC 36 Z9 37 U1 0 U2 2 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD APR PY 1994 VL 77 IS 4 BP 883 EP 890 DI 10.1111/j.1151-2916.1994.tb07243.x PG 8 WC Materials Science, Ceramics SC Materials Science GA NG916 UT WOS:A1994NG91600003 ER PT J AU ALEXANDER, KB BECHER, PF WATERS, SB BLEIER, A AF ALEXANDER, KB BECHER, PF WATERS, SB BLEIER, A TI GRAIN-GROWTH KINETICS IN ALUMINA-ZIRCONIA (CEZTA) COMPOSITES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID COMPUTER-SIMULATION; CERAMIC COMPOSITES; TITANIUM-ALLOYS; PARTICLES; MICROSTRUCTURE; BEHAVIOR; AL2O3; SIZE; ZRO2 AB Grain growth kinetics in alumina-rich, zirconia-alumina composites have been examined as a function of volume fraction of zirconia. Both the microstructural scale and character alter during grain growth. Grain growth exponents between n = 3 and 4 were observed and have been rationalized in terms of current models for grain growth and particle coarsening. Grain growth constants were measured and compared with available data. Coupled grain growth was observed in that the ratio of the alumina-to-zirconia grain size was constant, for a given zirconia content. This behavior is discussed in terms of the topological constraint present during growth and the observed microstructural evolution. The measured activation energies were consistent with boundary-diffusion-controlled grain growth. RP ALEXANDER, KB (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 55 TC 72 Z9 74 U1 0 U2 11 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 APR PY 1994 VL 77 IS 4 BP 939 EP 946 DI 10.1111/j.1151-2916.1994.tb07250.x PG 8 WC Materials Science, Ceramics SC Materials Science GA NG916 UT WOS:A1994NG91600010 ER PT J AU KIM, HE MOORHEAD, AJ AF KIM, HE MOORHEAD, AJ TI OXIDATION BEHAVIOR AND FLEXURAL STRENGTH OF ALUMINUM NITRIDE EXPOSED TO AIR AT ELEVATED-TEMPERATURES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID KINETICS; FILMS AB The oxidation behavior of a sintered aluminum nitride containing 3 wt% Y2O3 as a sintering aid was investigated. Samples were exposed to air at elevated temperatures for times up to 100 h. The weights of the samples were continuously monitored during exposure at various temperatures and humidity levels. The effects of oxidation on room-temperature flexural strength were also determined, and correlated to the observed weight changes of the samples. At temperatures less-than-or-equal-to 1200-degrees-C, linear weight gains were observed. However, at temperatures above 1200-degrees-C, the weight gains became parabolic with respect to exposure time. The oxidation rates were significantly increased by water vapor in the air. The oxidation products were found by X-ray analysis to be a mixture of Al2O3 and 5Al2O3.3Y2O3. The oxide layer formed on the surface was severely cracked because of the thermal expansion mismatch between the oxide layer and the substrate. The cracks initiated in the oxide layer and propagated into the substrate, resulting in severe reduction in the room-temperature flexural strength of the material. When exposed to ambient air for more than 50 h at temperatures greater than 1100-degrees-C, the strengths of the samples decreased to less than half that of the as-received material. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. NR 16 TC 27 Z9 27 U1 2 U2 5 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 APR PY 1994 VL 77 IS 4 BP 1037 EP 1041 DI 10.1111/j.1151-2916.1994.tb07264.x PG 5 WC Materials Science, Ceramics SC Materials Science GA NG916 UT WOS:A1994NG91600024 ER PT J AU LIBERTIN, CR WEAVER, P MOBARHAN, S WOLOSCHAK, GE AF LIBERTIN, CR WEAVER, P MOBARHAN, S WOLOSCHAK, GE TI SUBNORMAL ALBUMIN GENE-EXPRESSION IS ASSOCIATED WITH WEIGHT-LOSS IN IMMUNODEFICIENT DNA-REPAIR-IMPAIRED WASTED MICE SO JOURNAL OF THE AMERICAN COLLEGE OF NUTRITION LA English DT Article DE ALBUMIN DEFICIENCY; ATAXIA TELANGIECTASIA; WASTING SYNDROMES; WASTED MICE; GENE EXPRESSION ID ALPHA-FETOPROTEIN SYNTHESIS; ATAXIA-TELANGIECTASIA; IMMUNOLOGICAL ABNORMALITIES; ANIMAL-MODEL; MOUSE; MUTANT; TISSUE; CELLS AB Objective: Mice bearing the autosomal recessive mutation wst express a disease syndrome of immunodeficiency, neurologic dysfunction, increased sensitivity to the killing effects of ionizing radiation, and dramatic weight loss that begins at 21 days of age and progresses until death at 28-32 days of age. Because of the reported association between abnormal liver status and weight loss, we designed experiments to examine expression of a variety of liver-specific genes in wst/wst mice relative to littermates (wst/.) and parental strain (BCF1) controls. Method: Animals were individually weighed from ages 21-28 days to determine relative weight comparisons between wst/wst mice and controls. Dot blot hybridizations were set up to quantitate the accumulation of transcripts specific for alpha-fetoprotein, albumin and other liver-specific gene products. Results: These results showed a 67% reduction in albumin mRNA expression in livers derived from wst/wst mice relative to both controls. Expression of a-fetoprotein, as well as a variety of other liver-specific genes [secretory component (SC), metallothionein (MT-2), cytochrome P1-450 (Cyt P1-450), transferrin receptor (Tf Rec), tumor necrosis factor (TNF), and immune-associated antigen (1a)], was unaffected. Conclusions: These results suggest a relationship between low albumin expression and wasting syndromes in mice. In addition, our data suggest that the wasted mouse may serve as a unique model for subnormal albumin expression. C1 LOYOLA UNIV, STRITCH SCH MED, DEPT PATHOL, MAYWOOD, IL 60153 USA. ARGONNE NATL LAB, CTR MECHANIST & BIOTECHNOL, ARGONNE, IL 60439 USA. RP LIBERTIN, CR (reprint author), LOYOLA UNIV, STRITCH SCH MED, DEPT MED, 2160 S 1ST AVE, MAYWOOD, IL 60153 USA. RI Woloschak, Gayle/A-3799-2017 OI Woloschak, Gayle/0000-0001-9209-8954 NR 25 TC 3 Z9 3 U1 0 U2 0 PU AMER COLL NUTRITION PI NEW YORK PA C/O HOSP. JOINT DIS. 301 E. 17TH ST., NEW YORK, NY 10003 SN 0731-5724 J9 J AM COLL NUTR JI J. Am. Coll. Nutr. PD APR PY 1994 VL 13 IS 2 BP 149 EP 153 PG 5 WC Nutrition & Dietetics SC Nutrition & Dietetics GA ND611 UT WOS:A1994ND61100009 PM 7516354 ER PT J AU LOO, RRO SMITH, RD AF LOO, RRO SMITH, RD TI INVESTIGATION OF THE GAS-PHASE STRUCTURE OF ELECTROSPRAYED PROTEINS USING ION-MOLECULE REACTIONS SO JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY LA English DT Article ID IONIZATION-MASS-SPECTROMETRY; MULTIPLY CHARGED IONS; CAPILLARY ZONE ELECTROPHORESIS; INDUCED CONFORMATIONAL-CHANGES; OLIGONUCLEOTIDE DUPLEX; SEQUENCE INFORMATION; INDUCED DISSOCIATION; ISOTOPIC EXCHANGE; CYTOCHROME-C; COMPLEXES AB Proton tranfer reactions of ammonia, dimethylamine, diethylamine, and trimethylamine with multiply protonated proteins generated by electrospray ionization (ESI) were examined to probe the relationship between solution and gas-phase protein structure and the relationship with ion-molecule reactivity. The ion-molecule reactions were carried out in an atmospheric pressure capillary inlet/reactor based upon an ESI interface to a quadrupole mass spectrometer. Two types of systems were explored: (1) proteins possessing cysteinecysteine disulfide bonds and the analogous disulfide-reduced proteins, and (2) proteins sprayed from solution compositions where the protein has different conformations. While the cysteine-cysteine disulfide-bound proteins were more reactive than equally charged disulfide-reduced proteins under these conditions, no significant reactivity differences were noted for ions arising from different solution conformations. The effect of inlet/reactor temperature on charge distributions with and without amine reagent was also explored, demonstrating that thermal denaturation of proteins can occur in heated capillary inlets. The results are discussed in the context of recent results indicating the presistence of at least some higher order protein structure in the gas phase. 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 79 TC 72 Z9 72 U1 1 U2 7 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1044-0305 J9 J AM SOC MASS SPECTR JI J. Am. Soc. Mass Spectrom. PD APR PY 1994 VL 5 IS 4 BP 207 EP 220 PG 14 WC Biochemical Research Methods; Chemistry, Analytical; Chemistry, Physical; Spectroscopy SC Biochemistry & Molecular Biology; Chemistry; Spectroscopy GA NF015 UT WOS:A1994NF01500001 ER PT J AU HART, KJ MCLUCKEY, SA AF HART, KJ MCLUCKEY, SA TI RELATIVE DISSOCIATION-ENERGY MEASUREMENTS USING ION-TRAP COLLISIONAL ACTIVATION SO JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY LA English DT Article ID INFRARED MULTIPHOTON DISSOCIATION; TANDEM MASS-SPECTROMETRY; RANDOM NOISE; QUADRUPOLE; IONIZATION; PHOTODISSOCIATION; IRRADIATION; PARAMETERS AB The measured minimum resonance excitation amplitudes for decomposition of polyatomic ions in the quadrupole ion trap collisional activation experiment are shown to correlate with literature critical energies. The present article describes how experiments can be performed to derive threshold resonance excitation amplitudes via the kinetics associated with collision-induced dissociation (i.e., dissociation rate constants) in the quadrupole ion trap. The relationship between these threshold values and critical energies is established empirically by using kinetic data acquired for molecular ions with critical energies measured with other techniques. The experiments are complicated by the change in optimum resonance excitation frequency with amplitude, due presumably to contributions from higher order fields. It is proposed that the threshold resonance excitation amplitude is a measure of the change in temperature of the parent ion population required to achieve a measurable rate of decomposition. The present results indicate that the quadrupole ion trap may see new applications as a quantitative tool for the study of gaseous ion chemistry. C1 OAK RIDGE NATL LAB,DIV ANALYT CHEM,POB 2008,OAK RIDGE,TN 37831. RI McLuckey, Scott/B-2203-2009 OI McLuckey, Scott/0000-0002-1648-5570 NR 41 TC 73 Z9 73 U1 1 U2 4 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 APR PY 1994 VL 5 IS 4 BP 250 EP 259 DI 10.1016/1044-0305(94)85015-1 PG 10 WC Chemistry, Analytical; Chemistry, Physical; Spectroscopy SC Chemistry; Spectroscopy GA NF015 UT WOS:A1994NF01500005 PM 24222562 ER PT J AU MCLUCKEY, SA RAMSEY, RS AF MCLUCKEY, SA RAMSEY, RS TI GASEOUS MYOGLOBIN IONS STORED AT GREATER-THAN 300-K SO JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY LA English DT Note ID IONIZATION MASS-SPECTROMETRY; ELECTROSPRAY-IONIZATION; HIGH-RESOLUTION; NONCOVALENT INTERACTIONS; OLIGONUCLEOTIDE DUPLEX; COLLISIONAL-ACTIVATION; LARGE BIOMOLECULES; LARGE MOLECULES; TRAP; PROTEIN AB Multiply-charged myoglobin ions retaining the prosthetic heme group have been formed by electrospray, injected into a quadrupole ion trap, and stored for up to one second prior to mass analysis. Collisional activation experiments indicate that these ions readily fragment into the charged heme group and the complementary apomyoglobin ion. No fragmentation is observed, however, upon ion storage in the presence of a neutral bath gas at 1 x 10(-3) torr for up to one second. The significance of this observation is that these non-covalently-bound ions, in which both the heme group and the polypeptide carry charge, are kinetically stable for over one second at room temperature and, perhaps, at higher temperatures. This suggests that other biologically relevant ions derived using electrospray and bound by non-covalent interactions can be studied using the various tools available with ion storage mass spectrometers and by other techniques that employ relatively high pressure environments for the study of gaseous ions. RP MCLUCKEY, SA (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 42 TC 20 Z9 21 U1 0 U2 0 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 APR PY 1994 VL 5 IS 4 BP 324 EP 327 DI 10.1016/1044-0305(94)85023-2 PG 4 WC Chemistry, Analytical; Chemistry, Physical; Spectroscopy SC Chemistry; Spectroscopy GA NF015 UT WOS:A1994NF01500013 PM 24222570 ER PT J AU LEE, HS YANG, XQ MCBREEN, J XU, ZS SKOTHEIM, TA OKAMOTO, Y AF LEE, HS YANG, XQ MCBREEN, J XU, ZS SKOTHEIM, TA OKAMOTO, Y TI IONIC-CONDUCTIVITY OF A POLYMER ELECTROLYTE WITH MODIFIED CARBONATE AS A PLASTICIZER FOR POLY(ETHYLENE OXIDE) SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article AB A new type of plasticizer, a modified carbonate (MC3) made by attaching three ethylene oxide units to the 4-position of ethylene carbonate, has been synthesized. The ionic conductivity of a polymer electrolyte using this type of plasticizer in a poly(ethylene oxide) (PEO)-LiCF3SO3 complex has been studied. Adding 50% of this plasticizer by weight of PEO to the PEO-LiCF3SO3 complex, yielded an ionic conductivity of 5 x 10(-5) S/cm at 25-degrees-C, which is two orders of magnitude higher than that found f or a PEO-LiCF3SO3 electrolyte without a plasticizer, and one order of magnitude higher than that found when using propylene carbonate (PC) as a plasticizer. The temperature dependence of the conductivity and thermal analysis results indicate that this new plasticizer increases the ionic conductivity throughout the entire complex system, whereas conventional plasticizers, like PC, simply create a high conductivity pathway through the plasticizer itself. The new plasticizer also enhances the ion pair dissociation which in turn improves the ionic conductivity C1 MOLTECH CORP,STONY BROOK,NY 11794. POLYTECH INST NEW YORK,BROOKLYN,NY 11201. RP LEE, HS (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 7 TC 74 Z9 78 U1 0 U2 5 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 APR PY 1994 VL 141 IS 4 BP 886 EP 889 DI 10.1149/1.2054852 PG 4 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA NF410 UT WOS:A1994NF41000013 ER PT J AU TUMIDAJSKI, PJ BLANDER, M NEWMAN, DS AF TUMIDAJSKI, PJ BLANDER, M NEWMAN, DS TI SOLUBILITY OF AGCL IN MOLTEN NACL-ALCL3 AND KCL-ALCL3 SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID ALCL3-NACL MELTS; EQUILIBRIA; SOLVENT AB Measurements of AgCl solubility (in mol fraction units) in molten NaCl-AlCl3 and KCl-AlCl3 were determined by an electromotive force technique. For the NaCl-AlCl3 experiments, the temperature was maintained at 448 K and the composition of the solvent varied from X(AlCl3)solvent = 0.500 to X(AlCl3)solvent = 0.530. There was a compositional dependence of the AgCl solubilities with a minimum near the equimolar solvent composition. The minimum solubility in mol fraction of AgCl was 5.75 x 10(-3) at X(AlCl3)solvent = 0.505. The true solubility produce for AgCl at 448 K was calculated to be 7.35 x 10(-9). The magnitude of the solubility product is primarily related to the fact that the standard free energy of formation of NaAlCl4 from NaCl and AlCl3 is about 67 kJ mol-1 more negative than the corresponding free energy for AgAlCl4 (i.e., AgAlCl4 is unstable). In basic and in somewhat acidic melts, the solubility is related to the formation of the associated ionic species such as AgCl, AgCl2-, AgCl32-, and AgCl43-. From our measurements, the formation constant of AgCl at 448 K, K11, was 1.36 x 10(6). Further, the specific bond free energy for the associated complex AgCl, DELTAA11, has been calculated as -47.5 kJ mol-1. For the KCl-AlCl3 experiments, the composition was maintained at the equimolar and the temperature varied in the range 518 to 583 K. The AgCl solubility increases from 4.32 x 10(-3) at 518 K to 6.85 x 10(-3) at 583 K. The apparent heat of solution was 17.68 kJ mol-1 for this temperature range. C1 ARGONNE NATL LAB, ARGONNE, IL 60439 USA. BOWLING GREEN STATE UNIV, DEPT CHEM, BOWLING GREEN, OH 43403 USA. RP TUMIDAJSKI, PJ (reprint author), NATL RES COUNCIL CANADA, INST RES CONSTRUCT, MAT LAB, OTTAWA K1A 0R6, ONTARIO, CANADA. NR 19 TC 4 Z9 4 U1 0 U2 2 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 APR PY 1994 VL 141 IS 4 BP 895 EP 900 DI 10.1149/1.2054854 PG 6 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA NF410 UT WOS:A1994NF41000015 ER PT J AU FULLER, TF DOYLE, M NEWMAN, J AF FULLER, TF DOYLE, M NEWMAN, J TI RELAXATION PHENOMENA IN LITHIUM-ION-INSERTION CELLS SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID ELECTROLYTES AB Relaxation phenomena in lithium-ion-insertion cells are modeled. Simulation results are presented for a dual lithium-ion-insertion cell and for a cell using a lithium-foil negative electrode. A period of relaxation after a charge or discharge can cause appreciable changes in the distribution of material in the insertion electrodes. Local concentration cells in the solution phase and an open-circuit potential that depends on state of charge f or the solid phase drive the redistribution of material. Concentration profiles in solid and solution phases during relaxation are analyzed, and the consequences for cell performance are discussed. The model predicts the effects of relaxation time on multiple charge-discharge cycles and on peak power. Galvanostatic and potentiostatic charging are simulated; the results are compared to experimental data for a commercial battery. C1 UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RI Newman, John/B-8650-2008 OI Newman, John/0000-0002-9267-4525 NR 19 TC 191 Z9 193 U1 8 U2 74 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 APR PY 1994 VL 141 IS 4 BP 982 EP 990 DI 10.1149/1.2054868 PG 9 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA NF410 UT WOS:A1994NF41000029 ER PT J AU HE, L FRANZEN, HF VITT, JE JOHNSON, DC AF HE, L FRANZEN, HF VITT, JE JOHNSON, DC TI SYNTHESIS AND CHARACTERIZATION OF RU-TI4O7 MICROELECTRODE ARRAYS SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID DIFFUSION CURRENT; DISK ELECTRODE; DETECTORS AB A synthesis is described for Ru microelectrode arrays within a conductive Ti4O7 ceramic matrix. Data obtained by x-ray diffractometry and scanning electron microscopy are consistent with the existence of heterogeneous mixtures of Ru particles (ca. 0.8 mum diam) within the Ti4O7 matrices. No mixed metal oxides or other new compounds are detected. Rotated disk electrodes (RDEs) constructed from the Ru-Ti4O7 materials are compared on the basis of their voltammetric response for the oxidations of I- to I2 and IO3- in 0.10M H2SO4. These results are rationalized on the basis of microelectrode arrays, i.e., elevated current densities and diminished sensitivity to changes in rotational velocity compared with solid Ru RDE. An RDE constructed from Ru-Ti4O7 containing ca. 0.5% Ru by volume exhibits virtually zero dependence on rotational velocity for the oxidation of I- to I2 and, therefore, this material functions as an ideal microelectrode array C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP HE, L (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 24 TC 14 Z9 14 U1 0 U2 3 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 APR PY 1994 VL 141 IS 4 BP 1014 EP 1020 DI 10.1149/1.2054833 PG 7 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA NF410 UT WOS:A1994NF41000034 ER PT J AU CHRISTENSEN, RM AF CHRISTENSEN, RM TI PROPERTIES OF CARBON-FIBERS SO JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS LA English DT Article ID COMPOSITES AB THE MECHANICAL properties for carbon fibers are determined in terms of the elastic moduli of single crystal graphite. This is done for the two basic fiber microstructures, radial and onion skin. The final results are found through a transformation from cylindrically orthotropic to transversely isotropic properties. One of the five independent properties is found to be strongly influenced by the microstructure type. RP CHRISTENSEN, RM (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT APPL SCI,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550, USA. NR 9 TC 22 Z9 22 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-5096 J9 J MECH PHYS SOLIDS JI J. Mech. Phys. Solids PD APR PY 1994 VL 42 IS 4 BP 681 EP 695 DI 10.1016/0022-5096(94)90058-2 PG 15 WC Materials Science, Multidisciplinary; Mechanics; Physics, Condensed Matter SC Materials Science; Mechanics; Physics GA NF541 UT WOS:A1994NF54100007 ER PT J AU ICE, GE SPARKS, CJ AF ICE, GE SPARKS, CJ TI CONICAL GEOMETRY FOR SAGITTAL FOCUSING AS APPLIED TO X-RAYS FROM SYNCHROTRONS SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article ID DOUBLE-CRYSTAL MONOCHROMATOR; RADIATION; SYSTEM; IMPROVEMENT AB We describe a method for simultaneously focusing and monochromatizing x rays from a fan of radiation having as high as 15-mrad divergence in one dimension. This geometry is well suited to synchrotron radiation sources at magnifications of 1/5 to 2 and is efficient for x-ray energies between 3 and 40 keV (0.48 and 6.4 fJ). The method uses crystals bent to part of a cone for sagittal focusing and permits the collection of a larger divergence with less mixing of the horizontal into the vertical divergence than is possible with x-ray mirrors. We describe the geometry required for achieving the highest efficiency when a conical crystal follows a flat crystal in a nondispersive two-crystal monochromator. At a magnification of 1/3, the geometry is identical to that of a cylindrical focusing design described previously [Nucl. Instrum. Methods 172, 237 (1980)]. A simple theoretical calculation is shown to agree well with ray-tracing results. Minimum aberrations are observed at magnifications near 1. Applications of the conical focusing geometry to existing and future synchrotron radiation facilities is discussed. RP ICE, GE (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 31 TC 13 Z9 13 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3232 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD APR PY 1994 VL 11 IS 4 BP 1265 EP 1271 DI 10.1364/JOSAA.11.001265 PG 7 WC Optics SC Optics GA NE243 UT WOS:A1994NE24300010 ER PT J AU TISSUE, BM FEAREY, BL AF TISSUE, BM FEAREY, BL TI NARROW COHERENCE-INDUCED PEAKS IN DOPPLER-FREE SPECTRA OF THORIUM SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID IONIZATION MASS-SPECTROMETRY; SPECTROSCOPY; RESONANCE; ABSORPTION; EMISSION; SYSTEMS AB We report the observation of narrow peaks in Doppler-free spectra of thorium. The peaks are superimposed upon saturation-broadened line profiles in thorium atomic spectra by use of counterpropagating cw laser beams with resonance ionization mass spectrometry detection. At low laser powers the spectra show a conventional Lamp dip. As the laser power is increased, a narrow peak obscures the dip (for two of four transitions studied). The narrow peak is attributed to coherence effects at high laser powers. To confirm this assignment, we calculated the saturated absorption line shapes by using the theory of Haroche and Hartmann [Phys. Rev. A 6, 1280 (1972)]. The spectral simulations reproduce the narrow peaks and show the same dependence with laser power and transition strength as do the data. There are some quantitative discrepancies, particularly in the overall saturation broadening, but given that there were no adjustable parameters in the calculations, the agreement between theory and experiment is considered quite good. The Einstein A coefficients used in the calculations were determined from an analysis of the laser-power dependence of the saturation broadening for each transition. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP TISSUE, BM (reprint author), VIRGINIA POLYTECH INST & STATE UNIV,DEPT CHEM,BLACKSBURG,VA 24061, USA. NR 40 TC 3 Z9 3 U1 0 U2 1 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 APR PY 1994 VL 11 IS 4 BP 542 EP 551 DI 10.1364/JOSAB.11.000542 PG 10 WC Optics SC Optics GA NF095 UT WOS:A1994NF09500002 ER PT J AU DITMIRE, T NGUYEN, H PERRY, MD AF DITMIRE, T NGUYEN, H PERRY, MD TI DESIGN AND PERFORMANCE OF A MULTITERAWATT CR-LISRALF6 LASER SYSTEM SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID CHIRPED-PULSE AMPLIFICATION; FIELD HARMONIC-GENERATION; ND-GLASS LASER; REGENERATIVE AMPLIFIER; FEMTOSECOND PULSES; INDUCED IONIZATION; NOBLE-GASES; SUPPRESSION; CHAIN AB We have developed a compact, flash-lamp-pumped Cr:LiSrAlF6 (Cr:LiSAF) laser capable of producing femtosecond pulses exhibiting peak powers greater than 2 TW. Chirped pulse amplification in a Cr:LiSAF regenerative amplifier produces 15-mJ pulses at a 5-Hz repetition rate. Further amplification in Cr:LiSAF yields recompressed pulse energies of 280 mJ and a pulse duration of less than 135 fs at a 1.0-Hz repetition rate. We describe the design and performance of this laser as well as the optimization of chirped pulse amplification in flash-lamp-pumped Cr:LiSAF. RP DITMIRE, T (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L443,LIVERMORE,CA 94550, USA. NR 40 TC 28 Z9 28 U1 0 U2 2 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 APR PY 1994 VL 11 IS 4 BP 580 EP 590 DI 10.1364/JOSAB.11.000580 PG 11 WC Optics SC Optics GA NF095 UT WOS:A1994NF09500007 ER PT J AU HARASHINA, H SHAMOTO, S KODAMA, K SATO, M KAKURAI, K NISHI, M STERNLIEB, BJ SHIRANE, G AF HARASHINA, H SHAMOTO, S KODAMA, K SATO, M KAKURAI, K NISHI, M STERNLIEB, BJ SHIRANE, G TI NEUTRON-SCATTERING STUDIES OF INPLANE ZONE BOUNDARY PHONONS OF YBA2CU3O6.6 (T(C)SIMILAR-OR-EQUAL-TO-53-K) AND YBA2CU3O6.9 (T(C)SIMILAR-OR-EQUAL-TO-90-K) SO JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN LA English DT Article DE HIGH-T(C) OXIDES; YBCO; PHONON; SPIN GAP ID SPIN DYNAMICS; SUPERCONDUCTIVITY AB Energies of several in-plane phonons have been measured as a function of temperature T up to about 500 K in the highest case, for crystals of YBa2Cu3O6.6 (T(c) congruent-to 53 K) and YBa2Cu3O6.9 (T(c) congruent-to 90 K), in which the magnitudes of the transport anomalies are very much different. For a phonon mode in the rather narrow q-region near the zone boundary, or for a mode well characterized by the dimerization type motion of nearest neighbor Cu atoms in the CuO2 planes, the T-dependence of the phonon-energy is larger for the former crystal than the latter one, suggesting that the T-dependence is stronger for samples with larger transport anomalies. C1 UNIV TOKYO, INST SOLID STATE PHYS, MINATO KU, TOKYO 106, JAPAN. BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. RP NAGOYA UNIV, FAC SCI, DEPT PHYS, FURO CHO, CHIKUSA KU, NAGOYA 46401, JAPAN. NR 24 TC 8 Z9 8 U1 0 U2 0 PU PHYSICAL SOC JAPAN PI TOKYO PA YUSHIMA URBAN BUILDING 5F, 2-31-22 YUSHIMA, BUNKYO-KU, TOKYO, 113-0034, JAPAN SN 0031-9015 J9 J PHYS SOC JPN JI J. Phys. Soc. Jpn. PD APR PY 1994 VL 63 IS 4 BP 1386 EP 1395 DI 10.1143/JPSJ.63.1386 PG 10 WC Physics, Multidisciplinary SC Physics GA NG890 UT WOS:A1994NG89000027 ER PT J AU SMOOT, GF AF SMOOT, GF TI COBE OBSERVATIONS OF THE EARLY UNIVERSE SO JOURNAL OF THE ROYAL ASTRONOMICAL SOCIETY OF CANADA LA English DT Article AB The Cosmic Background Explorer (COBE) satellite was developed to measure the diffuse infrared and microwave radiation from the early universe, to the limits set by the astrophysical foregrounds. COBE has three instruments: the Differential Microwave Radiometer (DMR) maps the cosmic radiation precisely, the Far Infrared Absolute Spectrophotometer (FIRAS) compares the cosmic background radiation spectrum with that of a precise blackbody, and the Diffuse Infrared Background Experiment (DIRBE) searches for the accumulated light of primeval galaxies and stars. FIRAS has measured the cosmic background radiation spectrum nearly 1000 times more precisely than previous observations. The DMR discovered the cosmic background to be anisotropic at a level of a part in 10(5). The results strongly constrain comological models and the formation of structure in the present universe. The results from COBE are in good quantitative agreement with the calculations of the hot Big Bang model. The DMR data are in agreement with inflationary model predictions. RP SMOOT, GF (reprint author), LAWRENCE BERKELEY LAB,SPACE SCI LAB,BERKELEY,CA 94720, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ROYAL ASTRON SOC CANADA PI TORONTO PA 136 DUPONT ST, TORONTO ON M5R 1V2, CANADA SN 0035-872X J9 J ROY ASTRON SOC CAN JI J. R. Astron. Soc. Can. PD APR PY 1994 VL 88 IS 2 BP 114 EP 142 PG 29 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NJ880 UT WOS:A1994NJ88000003 ER PT J AU BLACKWELL, BF HOGAN, RE AF BLACKWELL, BF HOGAN, RE TI ONE-DIMENSIONAL ABLATION USING LANDAU TRANSFORMATION AND FINITE CONTROL-VOLUME PROCEDURE SO JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER LA English DT Article AB A technique utilizing the Landau transformation has been developed to solve one-dimensional variable area ablation problems. It is based on applying the integral form of the conservation equations to control volumes that are moving with velocities consistent with the Landau transformation. Exponential temperature profiles are assumed to evaluate the conduction and convection fluxes at control volume faces. The technique has been applied to one-dimensional planar and cylindrical geometries with sample calculations presented to verify the accuracy of the method. C1 SANDIA NATL LABS,DEPT THERMAL & FLUID ENGN 1513,ALBUQUERQUE,NM 87185. RP BLACKWELL, BF (reprint author), SANDIA NATL LABS,DEPT THERMOPHYS 1553,ALBUQUERQUE,NM 87185, USA. NR 15 TC 24 Z9 25 U1 2 U2 2 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0887-8722 J9 J THERMOPHYS HEAT TR JI J. Thermophys. Heat Transf. PD APR-JUN PY 1994 VL 8 IS 2 BP 282 EP 287 DI 10.2514/3.535 PG 6 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA NG696 UT WOS:A1994NG69600013 ER PT J AU GARDNER, MB AF GARDNER, MB TI SPECIAL TOPIC OVERVIEW - THE VIRUS CANCER PROGRAM OF THE 1970S - A PERSONAL AND RETROSPECTIVE VIEW SO LABORATORY ANIMAL SCIENCE LA English DT Article ID MURINE LEUKEMIA-VIRUS; MAMMARY-TUMOR VIRUS; DEPENDENT DNA POLYMERASE; WILD MICE; T-CELL; DOMESTIC CATS; GENOME EXPRESSION; SARCOMA-VIRUS; MOUSE STRAIN; LYMPHOMAS RP GARDNER, MB (reprint author), LAWRENCE LIVERMORE NATL LAB,SCH MED,DEPT PATHOL,DAVIS,CA 95616, USA. NR 118 TC 4 Z9 4 U1 0 U2 0 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 APR PY 1994 VL 44 IS 2 BP 101 EP 113 PG 13 WC Veterinary Sciences; Zoology SC Veterinary Sciences; Zoology GA NJ936 UT WOS:A1994NJ93600002 PM 8028270 ER PT J AU ERKKILA, TH HOLLEN, RM BEUGELSDIJK, TJ AF ERKKILA, TH HOLLEN, RM BEUGELSDIJK, TJ TI THE STANDARD LABORATORY MODULE - AN INTEGRATED APPROACH TO STANDARDIZATION IN THE ANALYTICAL LABORATORY SO LABORATORY ROBOTICS AND AUTOMATION LA English DT Article ID AUTOMATION AB The issue of multi-vendor integration of laboratory instrumentation and software is a recurring theme in laboratories all over the country. The thrust for this movement cannot come from an individual instrument or software manufacturer or vendor, nor from any single laboratory, since individually, no sufficient market push or pull can be mustered. This paper describes the Department of Energy's Contaminant Analysis Automation (CAA) program. The CAA program is driven by the multi-billion dollar environmental programs within the department. With such a large need, multi-vendor integration is being realized through this program. The basis of the CAA program is the Standard Laboratory Module (SLM) which forms the building block for entire methods and laboratories. The SLM is described in this paper and its use in the automation of entire methods is illustrated. RP ERKKILA, TH (reprint author), LOS ALAMOS NATL LAB,DIV ENGN SCI & APPLICAT,POB 1663,MS J580,LOS ALAMOS,NM 87544, USA. NR 9 TC 6 Z9 6 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 APR PY 1994 VL 6 IS 2 BP 57 EP 64 PG 8 WC Automation & Control Systems; Chemistry, Analytical; Robotics SC Automation & Control Systems; Chemistry; Robotics GA NJ935 UT WOS:A1994NJ93500001 ER PT J AU ERKKILA, TH CLARK, ML TURNER, TD DODSON, MG AF ERKKILA, TH CLARK, ML TURNER, TD DODSON, MG TI STANDARD LABORATORY MODULES - FUNCTION AND DESIGN SO LABORATORY ROBOTICS AND AUTOMATION LA English DT Article AB The standard laboratory modules (SLMs) are at the heart of the integrated systems being developed by the contaminant analysis automation (CAA) program. Several SLMs have been developed for the Environmental Protection Agency (EPA) methods 3540 and 3550 and are described later. In addition, the SLMs needed to complete each of these two methods are under development and progress is described. C1 IDAHO NATL ENGN LAB, IDAHO FALLS, ID USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP ERKKILA, TH (reprint author), LOS ALAMOS NATL LAB, SENSOR SYST & ROBOT GRP, MAILSTOP J580, LOS ALAMOS, NM 87545 USA. NR 0 TC 1 Z9 1 U1 0 U2 1 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 APR PY 1994 VL 6 IS 2 BP 65 EP 72 PG 8 WC Automation & Control Systems; Chemistry, Analytical; Robotics SC Automation & Control Systems; Chemistry; Robotics GA NJ935 UT WOS:A1994NJ93500002 ER PT J AU ELLING, JW KLATT, LN UNRUH, WP AF ELLING, JW KLATT, LN UNRUH, WP TI AUTOMATED DATA INTERPRETATION IN AN AUTOMATED ENVIRONMENTAL LABORATORY SO LABORATORY ROBOTICS AND AUTOMATION LA English DT Article AB The goal of a fully automated laboratory is to generate chemical knowledge from a sample input. To carry this out, a fully automated laboratory will require automated sample preparation, automated instrumental analysis of the sample, and automated interpretation of the data from the instrument. Automated sample analysis and quality-control data interpretation are also necessary to feed back information to the automated sample preparation process. We are developing an automated gas chromatography (GC) instrument in the contaminant analysis automation (CAA) project modular format and exploring the automated interpretation of the chromatograms generated from each sample. The target for the demonstration of automated analysis and automated data interpretation is Environmental Protection Agency (EPA) method 8080, for organochlorine compounds and polychlorinated biphenyls (PCBs). C1 OAK RIDGE NATL LAB,DIV ROBOT & PROCESS SYST,OAK RIDGE,TN 37831. RP ELLING, JW (reprint author), LOS ALAMOS NATL LAB,SENSOR SYST & ROBOT GRP,MAILSTOP J580,LOS ALAMOS,NM 87545, USA. NR 3 TC 6 Z9 6 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 APR PY 1994 VL 6 IS 2 BP 73 EP 78 PG 6 WC Automation & Control Systems; Chemistry, Analytical; Robotics SC Automation & Control Systems; Chemistry; Robotics GA NJ935 UT WOS:A1994NJ93500003 ER PT J AU GRIESMEYER, JM URENDA, TD PACETTI, RM FERGUSON, JJ AF GRIESMEYER, JM URENDA, TD PACETTI, RM FERGUSON, JJ TI A STANDARD CONTROL-SYSTEM FOR MODULAR AUTOMATION OF CHEMISTRY SO LABORATORY ROBOTICS AND AUTOMATION LA English DT Article AB Sandia National Laboratories and Idaho National Engineering Laboratory are developing a control system to orchestrate operations in an automated analytical chemistry laboratory. Individual software components connected by standardized interfaces provide for a modularized control and information system. The basic approach to automated laboratory system control in the Department of Energy's contaminant analysis automation (CAA) project is described. The implementation of this approach is the task sequence controller (TSC), a software module that provides the supervisory control of the laboratory subsystems and ensures the successful completion of sample analyses. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. IDAHO NATL ENGN LAB,IDAHO FALLS,ID. NR 5 TC 2 Z9 2 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 APR PY 1994 VL 6 IS 2 BP 79 EP 84 PG 6 WC Automation & Control Systems; Chemistry, Analytical; Robotics SC Automation & Control Systems; Chemistry; Robotics GA NJ935 UT WOS:A1994NJ93500004 ER PT J AU MEDVICK, PA AF MEDVICK, PA TI DATABASE FOR THE DEPARTMENT-OF-ENERGY CONTAMINANT ANALYSIS AUTOMATION PROGRAM SO LABORATORY ROBOTICS AND AUTOMATION LA English DT Article AB As part of the Department of Energy's (DOE) cleanup effort, the contaminant analysis automation (CAA) program is developing a fully automated, modular laboratory for analytical chemistry to automate the process of soil sample analysis. The software for this laboratory, constructed in the object-oriented language C++, has an object-oriented database as one of its major components. This database is designed to maintain the permanent store of data necessary for laboratory system start-up and maintenance and to provide the storage required for quality control, quality assurance, and analysis results. RP MEDVICK, PA (reprint author), LOS ALAMOS NATL LAB,ROBOT SECT,MEE-3,MS J580,LOS ALAMOS,NM 87545, USA. NR 5 TC 1 Z9 1 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 APR PY 1994 VL 6 IS 2 BP 85 EP 88 PG 4 WC Automation & Control Systems; Chemistry, Analytical; Robotics SC Automation & Control Systems; Chemistry; Robotics GA NJ935 UT WOS:A1994NJ93500005 ER PT J AU MNISZEWSKI, S AF MNISZEWSKI, S TI HUMAN-COMPUTER INTERFACE FOR CONTAMINANT ANALYSIS AUTOMATION SO LABORATORY ROBOTICS AND AUTOMATION LA English DT Article AB The human computer interface (HCI) is one of the major software components in the Department of Energy's (DOE) contaminant analysis automation (CAA) project for automation of analytical chemistry laboratory methods for soil sample analysis. The HCI is a ''plug and play'' software module similar to the database, task sequence controller (TSC), and individual standard laboratory module (SLM) controllers. All CAA system software is object-oriented. A testing HCI was initially developed in the object-oriented language C++ and the XView Toolkit. This HCI was built for development of the SLM hardware and software. It provided an icon-, button-, and text-oriented interface to all levels of commands for each SLM. The system integration HCI has been developed using the real-time object-oriented expert system tool, G2, as a more flexible and graphical interface. Chemical method management is the main part of this HCI providing monitoring and support facilities such as chemical method monitoring, TSC control, sample entry and control, SLM control, waste tracking, alarm handling, and performance monitoring. Configuration management editors allow chemical method, SLM, and laboratory bench additions and modifications to be made easily. SLM maintenance interfaces provide a low-level testing facility for SLM fault resolution. RP MNISZEWSKI, S (reprint author), LOS ALAMOS NATL LAB,DIV COMP & COMMUN,POB 1663,MS B265,LOS ALAMOS,NM 87544, USA. NR 6 TC 1 Z9 1 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 APR PY 1994 VL 6 IS 2 BP 89 EP 93 PG 5 WC Automation & Control Systems; Chemistry, Analytical; Robotics SC Automation & Control Systems; Chemistry; Robotics GA NJ935 UT WOS:A1994NJ93500006 ER PT J AU FANG, JY UPHAUS, RA AF FANG, JY UPHAUS, RA TI SURFACE PRESSURE-INDUCED LAYER GROWTH OF A MONOLAYER AT THE AIR-WATER-INTERFACE SO LANGMUIR LA English DT Letter ID LANGMUIR-BLODGETT-FILMS; PHASE-TRANSITIONS; LIPID MONOLAYER; LIQUID-CRYSTAL AB Spread monolayers containing a nematic liquid crystal and stearic acid were characterized at various mole fractions by determination of surface pressure-area isotherms at the air-water interface. The surface-composition phase diagrams indicate that compression induces a new phase transition in the films, which changes from a mixed monolayer to a supermonomolecular system. X-ray diffraction and optical absorption spectra demonstrate that the supermolecular array consists of an island liquid crystal monolayer and a uniform stearic acid monolayer. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 12 TC 7 Z9 7 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD APR PY 1994 VL 10 IS 4 BP 1005 EP 1007 DI 10.1021/la00016a008 PG 3 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA NH597 UT WOS:A1994NH59700009 ER PT J AU LI, DQ MOORE, LW SWANSON, BI AF LI, DQ MOORE, LW SWANSON, BI TI FORMATION OF METAL-CLUSTERS ON THE SURFACES OF COVALENTLY BOUND SELF-ASSEMBLED LIGAND MONOLAYERS SO LANGMUIR LA English DT Article ID ORGANIZED MOLECULAR ASSEMBLIES; NONLINEAR OPTICAL-MATERIALS; RAY CRYSTAL-STRUCTURE; CARBONYL CLUSTERS; RUTHENIUM(III) PORPHYRINS; REFLECTION ABSORPTION; SUPPORTED CATALYSTS; GOLD ELECTRODES; METHANATION; REACTIVITY AB This paper describes interactions between metal complexes and self-assemblies of covalently bound ligand monolayers on surfaces. Covalently bound molecular self-assemblies of (3-cyanopropyl) trichlorosilane (CPTS) were anchored on the surfaces of fused quartz and the native oxide of the [100] crystallographic orientation of p-doped Si wafers. The formations of a number of ruthenium and osmium metal carbonyl complexes on both the substrates and substrates coated with ligand monolayers have been examined with polarized variable-angle internal attenuated total reflection infrared spectroscopy (PVAI-ATR-IR). Both mononuclear species M(CO)(n)L (n = 2,3), where L = -(CH2)3CN, ana multinuclear species M3(CO)10(mu-CO)L were observed on the surface of the covalently bound, self-assembled ligand monolayers when the coated substrates were treated with M3(CO)12, where M = Ru and Os. Ruthenium porphyrin macrocycle RuTPP(CO).THF which has a ''disklike'' structure was bound to a CPTS axial ligand and then formed a covalently bound, self-assembled monolayer of ''porphyrin-disk'' stacking on the quartz surface. This monolayer was analyzed by UV-vis spectroscopy and secondary ion mass spectrometry (SIMS). RP LI, DQ (reprint author), LOS ALAMOS NATL LAB,INC 14,LOS ALAMOS,NM 87545, USA. NR 54 TC 39 Z9 40 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD APR PY 1994 VL 10 IS 4 BP 1177 EP 1185 DI 10.1021/la00016a035 PG 9 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA NH597 UT WOS:A1994NH59700036 ER PT J AU DEINHAMMER, RS HO, M ANDEREGG, JW PORTER, MD AF DEINHAMMER, RS HO, M ANDEREGG, JW PORTER, MD TI ELECTROCHEMICAL OXIDATION OF AMINE-CONTAINING COMPOUNDS - A ROUTE TO THE SURFACE MODIFICATION OF GLASSY-CARBON ELECTRODES SO LANGMUIR LA English DT Article ID CHEMICALLY MODIFIED ELECTRODES; FIBER MICROELECTRODES; GRAPHITE-ELECTRODES; PYROLYTIC-GRAPHITE; TRANSFER KINETICS; FUNCTIONAL-GROUPS; ELECTROCATALYSIS; SPECTROSCOPY; ACTIVATION; ATTACHMENT AB A method for the modification of glassy carbon electrodes (GCEs) with amine-containing compounds for electrocatalytic and biosensor purposes is investigated. The method utilizes the electrooxidation of amines to their analogous cation radicals to form a chemically stable covalent linkage between the nitrogen atom of the amine and edge plane sites at the GCE surface. By use of X-ray photoelectron spectroscopy (XPS) for coverage assessment, the capability of this route is demonstrated by the immobilization of a simple primary amine at the GCE surface. An investigation of the influence of substituents on the nitrogen atom (e.g., primary, secondary, tertiary amines) revealed that the surface coverage of primary amines was approximately 3 times higher than that of secondary amines, whereas tertiary amines were not immobilized at a detectable level. This behavior is attributed to a strong steric effect whereby bulky substituents on the nitrogen atom hinder accessibility of the reactive amine cation radical to surface binding sites. Amine salts and amides also showed no detectable coverage by XPS. The utility of the method for creation of a GCE with electrocatalytic activity is demonstrated by the immobilization of dopamine (DA) at the GCE surface. The DA-modified GCE is used to facilitate oxidation of beta-NADH via a surface EC mechanism. The applicability of this method for the construction of biosensors that are based on biotin-avidin complexation is also demonstrated. Both of these examples illustrate the facility of this route for simplifying and shortening dramatically the processing required for immobilization using other synthetic methods. A mechanism for the immobilization process is also briefly discussed. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE AMES LAB,AMES,IA 50011. NR 43 TC 254 Z9 259 U1 3 U2 48 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD APR PY 1994 VL 10 IS 4 BP 1306 EP 1313 DI 10.1021/la00016a054 PG 8 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA NH597 UT WOS:A1994NH59700055 ER PT J AU DAVIS, JI JACOBS, RR BOZARTH, J AF DAVIS, JI JACOBS, RR BOZARTH, J TI LLNL PROPOSES NATIONAL PROGRAMS TO SPUR US COMPETITIVENESS SO LASER FOCUS WORLD LA English DT Article C1 LAWRENCE LIVERMORE NATL LAB,LASER & ENVIRONM DIRECTORATE,LIVERMORE,CA 94550. NR 6 TC 0 Z9 0 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 APR PY 1994 VL 30 IS 4 BP 109 EP & PG 0 WC Optics SC Optics GA NF194 UT WOS:A1994NF19400022 ER PT J AU SARKER, M GUIOCHAN, G AF SARKER, M GUIOCHAN, G TI THE PACKING STABILITY OF DYNAMICALLY COMPRESSED PREPARATIVE CHROMATOGRAPHY COLUMNS SO LC GC-MAGAZINE OF SEPARATION SCIENCE LA English DT Article ID PERFORMANCE LIQUID-CHROMATOGRAPHY; OPTIMIZATION C1 OAK RIDGE NATL LAB,DEPT ANALYT CHEM,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. NR 28 TC 7 Z9 7 U1 0 U2 1 PU ADVANSTAR COMMUNICATIONS PI DULUTH PA 131 W FIRST ST, DULUTH, MN 55802 SN 0888-9090 J9 LC GC-MAG SEP SCI JI LC GC-Mag. Sep. Sci. PD APR PY 1994 VL 12 IS 4 BP 300 EP & PG 0 WC Chemistry, Analytical SC Chemistry GA NE234 UT WOS:A1994NE23400003 ER PT J AU WILLIAMS, G AF WILLIAMS, G TI METHODS FOR SOCIAL ANALYSIS IN DEVELOPING-COUNTRIES - FINSTERBUSCH,K, INGERSOLL,J, LLEWELLYN,L SO LEISURE SCIENCES LA English DT Book Review RP WILLIAMS, G (reprint author), ARGONNE NATL LAB,ENVIRONM MANAGEMENT & POLICY GRP,WASHINGTON,DC 20024, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0149-0400 J9 LEISURE SCI JI Leis. Sci. PD APR-JUN PY 1994 VL 16 IS 2 BP 135 EP 137 PG 3 WC Hospitality, Leisure, Sport & Tourism; Sociology SC Social Sciences - Other Topics; Sociology GA NW764 UT WOS:A1994NW76400009 ER PT J AU HINCKLEY, CM BARKAN, P AF HINCKLEY, CM BARKAN, P TI THE SECRET TO UNDERSTANDING PRODUCT DEFECTS SO MANUFACTURING ENGINEERING LA English DT Article RP HINCKLEY, CM (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SOC MANUFACTURING ENGINEERS PI DEARBORN PA ONE SME DRIVE, PO BOX 930, DEARBORN, MI 48121-0930 SN 0361-0853 J9 MANUF ENG JI Manuf. Eng. PD APR PY 1994 VL 112 IS 4 BP 10 EP 10 PG 1 WC Engineering, Manufacturing SC Engineering GA ND838 UT WOS:A1994ND83800002 ER PT J AU GEORGE, EP LIU, CT HORTON, JA SPARKS, CJ KAO, M KUNSMANN, H KING, T AF GEORGE, EP LIU, CT HORTON, JA SPARKS, CJ KAO, M KUNSMANN, H KING, T TI CHARACTERIZATION, PROCESSING, AND ALLOY DESIGN OF NIAL-BASED SHAPE-MEMORY ALLOYS SO MATERIALS CHARACTERIZATION LA English DT Article ID THERMOELASTIC MARTENSITIC-TRANSFORMATION; AL ALLOYS; PREMARTENSITIC MICROSTRUCTURES; MECHANICAL-PROPERTIES; ELECTRON-MICROSCOPY; BETA-2 PHASE; NI5AL3; NI-36.8 AB The microstructures and phase transformations in binary Ni-Al, ternary Ni-Al-Fe, and quaternary Ni-Al-Fe-Mn shape memory alloys (SMAs) were investigated by light and electron microscopy, electron and X-ray diffraction, and differential scanning calorimetry. The effects of alloying additions (B, Fe, and Mn) on martensite stability, shape recovery, and tensile ductility were also studied. NiAl-based SMAs can be made ductile by alloying with B for enhanced grain boundary cohesion and Fe for improved bulk properties. Iron has the undesirable effect that it decreases the martensite --> austenite transformation temperatures (A(p)). Fortunately, A(p) can be increased by decreasing the ''equivalent'' Al content of the alloy. In this way, a high A(p) temperature of approximately 190-degrees-C has been obtained without sacrificing ductility. Recoverable strains of approximately 0.7% have been obtained in a Ni-Al-Fe alloy with A(p) temperature of approximately 140-degrees-C. Manganese additions (2-10%) lower A(p), degrade hot workability, and decrease room temperature ductility. Good-quality, ductile SMA ribbons have been produced by melt spinning. However, additional alloy design is required to suppress the aging-induced embrittlement caused by Ni5Al3 formation. C1 JOHNSON CONTROLS INC,MILWAUKEE,WI 53209. EATON CORP,MILWAUKEE,WI 53216. RP GEORGE, EP (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. RI George, Easo/L-5434-2014; OI Liu, Chain Tsuan/0000-0001-7888-9725 NR 42 TC 39 Z9 42 U1 0 U2 5 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 1044-5803 J9 MATER CHARACT JI Mater. Charact. PD APR PY 1994 VL 32 IS 3 BP 139 EP 160 DI 10.1016/1044-5803(94)90084-1 PG 22 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Materials Science, Characterization & Testing SC Materials Science; Metallurgy & Metallurgical Engineering GA NN412 UT WOS:A1994NN41200002 ER PT J AU ITIN, VI GYUNTER, VE SHABALOVSKAYA, SA SACHDEVA, RLC AF ITIN, VI GYUNTER, VE SHABALOVSKAYA, SA SACHDEVA, RLC TI MECHANICAL-PROPERTIES AND SHAPE-MEMORY OF POROUS NITINOL SO MATERIALS CHARACTERIZATION LA English DT Article AB The mechanical properties and shape memory effect parameters of new porous TiNi alloys for implantation and prothesis were reviewed. Their porous structure provides excellent ingrowth in living tissue and firm fixation. Due to their generally good biocompatibility, these materials can serve in the body for a long time without being removed. Two manufacturing methods of porous TiNi are described here, powder sintering and ignition synthesis. Porous TiNi alloys manufactured using these methods exhibit superelasticity and shape memory effect, the parameters of which strongly depend on the conditions of sintering or synthesis. Under certain conditions, these parameters approach those of solid alloys. The yield strength, the percent of shape recovery, and the stored recoverable strain are controlled by porosity. Higher porosity and low average magnitude of plastic deformation result in a higher percent of shape recovery and recoverable strains. C1 AMES LAB,DOE,AMES,IA 50011. BAYLOR COLL DENT,DALLAS,TX 75246. RP ITIN, VI (reprint author), VD KUZNETSOV PHYS TECH INST,TOMSK 634050,RUSSIA. RI Gunter, Viktor/O-6678-2014 NR 23 TC 142 Z9 151 U1 6 U2 26 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 1044-5803 J9 MATER CHARACT JI Mater. Charact. PD APR PY 1994 VL 32 IS 3 BP 179 EP 187 DI 10.1016/1044-5803(94)90087-6 PG 9 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Materials Science, Characterization & Testing SC Materials Science; Metallurgy & Metallurgical Engineering GA NN412 UT WOS:A1994NN41200005 ER PT J AU GRAY, LJ POTYONDY, DO LUTZ, ED WAWRZYNEK, PA MARTHA, LF INGRAFFEA, AR AF GRAY, LJ POTYONDY, DO LUTZ, ED WAWRZYNEK, PA MARTHA, LF INGRAFFEA, AR TI CRACK-PROPAGATION MODELING SO MATHEMATICAL MODELS & METHODS IN APPLIED SCIENCES LA English DT Article ID BOUNDARY ELEMENT METHOD; 3-DIMENSIONAL ELASTICITY; HYPERSINGULAR INTEGRALS; EQUATIONS AB In this paper, we review recent advances in mathematical and computer science techniques for modeling crack propagation in solids. The fracture mechanics aspect of this problem is attacked by boundary integral equation methods, in particular the use of hypersingular integral equations for analyzing crack geometries. Key issues in the development of a software system capable of efficient crack propagation studies are also discussed. As an illustration of these techniques, calculations analyzing crack growth in a fuel door hinge on the Space Shuttle are presented. C1 CORNELL UNIV,SCH CIVIL & ENVIRONM ENGN,FRACTURE GRP,ITHACA,NY 14853. RP GRAY, LJ (reprint author), OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,MATH SCI SECT,OAK RIDGE,TN 37831, USA. NR 62 TC 10 Z9 10 U1 0 U2 5 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0218-2025 J9 MATH MOD METH APPL S JI Math. Models Meth. Appl. Sci. PD APR PY 1994 VL 4 IS 2 BP 179 EP 202 DI 10.1142/S021820259400011X PG 24 WC Mathematics, Applied SC Mathematics GA NH441 UT WOS:A1994NH44100002 ER PT J AU DAVIES, KTR AF DAVIES, KTR TI A NEW METHOD FOR CALCULATING CLASSICAL PERIODIC TRAJECTORIES IN 2 DIMENSIONS SO MATHEMATICAL MODELS & METHODS IN APPLIED SCIENCES LA English DT Article ID DEFORMED OSCILLATOR MODEL; VIBRATIONS; QUANTIZATION; EQUATIONS; SYSTEMS AB Previously, the monodromy method has been widely used for calculating classical periodic trajectories for a two-dimensional Hamiltonian system, or a four-dimensional phase space. In this paper, the problem is formulated from a different point of view, involving Gaussian-elimination algorithms. Thus, we present a new method for calculating classical periodic orbits, in which each of the basic matrices is of dimension two. Two variants are obtained, one assuming that the period of the motion is fixed and the other assuming that the total energy is fixed. We emphasize the importance of calculating the periodic orbits in as small a dimensionality as possible, an advantage which has implications for generalizations of the theory and methods to outstanding many-body problems in nuclear and atomic physics. Comparisons are made between various approaches. C1 DUQUESNE UNIV,DEPT PHYS,PITTSBURGH,PA 15282. RP DAVIES, KTR (reprint author), OAK RIDGE NATL LAB,DIV PHYS,CTR COMPUTAT INTENS PHYS,OAK RIDGE,TN 37831, USA. NR 49 TC 1 Z9 1 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0218-2025 J9 MATH MOD METH APPL S JI Math. Models Meth. Appl. Sci. PD APR PY 1994 VL 4 IS 2 BP 251 EP 264 DI 10.1142/S0218202594000157 PG 14 WC Mathematics, Applied SC Mathematics GA NH441 UT WOS:A1994NH44100006 ER PT J AU HENDRICKS, CD LACKNER, KS PERL, ML SHAW, GS AF HENDRICKS, CD LACKNER, KS PERL, ML SHAW, GS TI EFFICIENT BULK SEARCH FOR FRACTIONAL CHARGE WITH MULTIPLEXED MILLIKAN CHAMBERS SO MEASUREMENT SCIENCE AND TECHNOLOGY LA English DT Article ID ELECTRIC CHARGE; CHEMISTRY; NIOBIUM; SPHERES; MATTER; ATOMS AB We outline the design of a fully automated Millikan droplet apparatus that could detect a single free fractional charge in several hundred grams of matter even without the use of a prefilter. This would constitute an improvement over current limits by about three orders of magnitude. The experiment achieves high material throughput and high background rejection through on-line processing which allows for a feedback system that can concentrate the measurement effort on anomalous droplets. The task is simplified by generating a monodisperse stream of droplets which will be preprocessed to let only a very narrow range of charges enter the Millikan chamber. Because the droplets can act as carriers of finely dispersed materials it is also possible to search for fractional charge in matter that has not undergone extensive refinement that may have excluded fractionally charged atoms from the sample. In a large refinery style operation many such Millikan chambers could run concurrently to achieve extremely large material throughput. C1 WJ SCHAFER ASSOCIATES INC, LIVERMORE, CA 94550 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. UNIV CALIF IRVINE, IRVINE, CA 92717 USA. STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94305 USA. RP LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94551 USA. NR 29 TC 10 Z9 10 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0957-0233 EI 1361-6501 J9 MEAS SCI TECHNOL JI Meas. Sci. Technol. PD APR PY 1994 VL 5 IS 4 BP 337 EP 347 DI 10.1088/0957-0233/5/4/003 PG 11 WC Engineering, Multidisciplinary; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA NF905 UT WOS:A1994NF90500003 ER PT J AU ROBINO, CV HOCHANADEL, PW EDWARDS, GR CIESLAK, MJ AF ROBINO, CV HOCHANADEL, PW EDWARDS, GR CIESLAK, MJ TI HEAT-TREATMENT OF INVESTMENT CAST PH 13-8 MO STAINLESS-STEEL .2. ISOTHERMAL AGING KINETICS SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID PRECIPITATION AB The hardening response of investment cast PH 13-8 Mo stainless steel has been evaluated by hardness measurements following aging in the temperature range normally specified for this alloy (510-degrees-C to 593-degrees-C). A new relationship between fraction transformed and hardness was developed, and analysis of the data in terms of the kinetics of precipitation, in a manner similar to that frequently applied to other precipitation-hardenable martensitic steels, yielded low time exponents and a low value for the apparent activation energy. The values of the time exponents were 0.49, 0.37, 0.56, and 0.53 at 510-degrees-C, 538-degrees-C, 566-degrees-C, and 593-degrees-C, respectively, and that for the apparent activation energy was 139 kJ/mole. As has been proposed for other maraging type steels, these estimates suggest that beta-NiAl precipitates along or near dislocations and that growth of the precipitates is dominated by dislocation pipe diffusion. However, these predictions were neither supported nor refuted by transmission electron microscopy (TEM) because of difficulties in imaging the beta-NiAl precipitates at the aging times and temperatures used. Further, analysis of the data using the formalism of Wert and Zener for the growth of precipitates with interfering diffusion fields indicated that the estimates of fraction transformed from hardness data are not fully appropriate for maraging type steels. Consideration of the nature of the Avrami analysis and the electron microscopy results suggests that other phenomena, including dislocation recovery and reversion of martensite to austenite, occur at rates sufficient to convolute the Avrami analysis. It is further suggested that these results cast doubt on the fundamental implications of previous analyses of precipitation kinetics in age-hardening martensitic steels. Although the Avrami analysis was found not to provide a tenable description of the precipitation kinetics, it does provide a reasonable methodology for portrayal of the hardening response of PH 13-8 Mo stainless steel. C1 COLORADO SCH MINES,CTR WELDING & JOINING RES,DEPT MET & MAT ENGN,GOLDEN,CO 80401. RP ROBINO, CV (reprint author), SANDIA NATL LABS,DEPT PHYS & JOINING MET,ALBUQUERQUE,NM 87185, USA. NR 21 TC 17 Z9 18 U1 1 U2 7 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD APR PY 1994 VL 25 IS 4 BP 697 EP 704 DI 10.1007/BF02665446 PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NG047 UT WOS:A1994NG04700004 ER PT J AU HOCHANADEL, PW ROBINO, CV EDWARDS, GR CIESLAK, MJ AF HOCHANADEL, PW ROBINO, CV EDWARDS, GR CIESLAK, MJ TI HEAT-TREATMENT OF INVESTMENT CAST PH 13-8 MO STAINLESS-STEEL .1. MECHANICAL-PROPERTIES AND MICROSTRUCTURE SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID MOSSBAUER AB The microstructure of investment cast PH 13-8 Mo stainless steel heat-treated to various conditions was studied using light and electron microscopy, electron probe microanalysis, and Mossbauer spectroscopy. The mechanical properties were investigated by using uniaxial tensile testing, hardness testing, and Charpy impact testing. The beta-NiAl strengthening precipitates, though detectable by electron diffraction, were difficult to resolve by transmission electron microscopy (TEM) in specimens aged at low temperatures (566-degrees-C and below). A high dislocation density was observed in the lath martensitic structure. The higher strength and lower ductility observed at low aging temperatures was attributed to both the high dislocation density and the precipitation of beta-NiAl. When samples were aged at high temperatures (>566-degrees-C), a lower dislocation density and a reverted austenite fraction on the order of 15 pct were observed. Spherical beta-NiAl precipitates were observed in the overaged condition. The decrease in strength and corresponding increase in ductility observed in samples aged at temperatures above 566-degrees-C were attributed to the reverted austenite and recovery. Mechanical properties were improved when the homogenizing temperature and time were increased. Electron probe microanalysis quantified the increased homogeneity realized by increasing homogenizing temperature and time. Elimination of the refrigeration step, which normally follows the solution treatment, did not degrade the mechanical properties. Mossbauer spectroscopy showed only minor decreases in the fraction of retained austenite when refrigeration followed the solution treatment. C1 SANDIA NATL LABS,DEPT PHYS & JOINING MET,ALBUQUERQUE,NM 87185. RP HOCHANADEL, PW (reprint author), COLORADO SCH MINES,CTR WELDING & JOINING RES,DEPT MET & MAT ENGN,GOLDEN,CO 80401, USA. NR 21 TC 40 Z9 40 U1 1 U2 8 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD APR PY 1994 VL 25 IS 4 BP 789 EP 798 DI 10.1007/BF02665455 PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NG047 UT WOS:A1994NG04700013 ER PT J AU ZALUZEC, NJ AF ZALUZEC, NJ TI MICROSCOPY BY E-MAIL SO MICROSCOPY MICROANALYSIS MICROSTRUCTURES LA English DT Editorial Material RP ZALUZEC, NJ (reprint author), ARGONNE NATL LAB,ELECTRON MICROSCOPY CTR MAT RES,DIV MAT SCI,BLDG 212,ARGONNE,IL 60439, USA. NR 0 TC 0 Z9 0 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 1154-2799 J9 MICROSC MICROANAL M JI Microsc. Microanal. Microstruct. PD APR PY 1994 VL 5 IS 2 BP R1 EP R2 DI 10.1051/mmm:01994005020R100 PG 2 WC Microscopy; Spectroscopy SC Microscopy; Spectroscopy GA PE317 UT WOS:A1994PE31700001 ER PT J AU BHARGAVA, V THOR, A DENG, GR LJUNG, BM MOORE, DH WALDMAN, F BENZ, C GOODSON, W CHEW, K SMITH, HS AF BHARGAVA, V THOR, A DENG, GR LJUNG, BM MOORE, DH WALDMAN, F BENZ, C GOODSON, W CHEW, K SMITH, HS TI THE ASSOCIATION OF P53 IMMUNOPOSITIVITY WITH TUMOR PROLIFERATION AND OTHER PROGNOSTIC INDICATORS IN BREAST-CANCER SO MODERN PATHOLOGY LA English DT Article DE P53 IMMUNOPOSITIVITY; BREAST CARCINOMA; TUMOR PROLIFERATION ID WILD-TYPE; SUPPRESSOR GENES; POOR PROGNOSIS; EXPRESSION; OVEREXPRESSION; P53-PROTEIN; MUTATIONS; PROTEIN; BENIGN; INSITU AB Abnormal accumulation of the p53 tumor suppressor gene product was analyzed in 198 primary invasive human breast carcinomas. In 47 of these cases, single-strand conformational polymorphism was used to detect mutations in the highly conserved exons 5-9 of the gene. Mutations as determined by single-strand conformational polymorphism were found in 15 of 15 strongly immunopositive cases (100%) and 3 of 23 immunonegative cases (13%). There were also nine cases with <1% immunopositive cells (borderline immunopositivity); p53 mutations were detected in seven of these cases. The results suggest that p53 immunopositivity is a highly specific, albeit somewhat insensitive surrogate for p53 mutations. p53 accumulation, detected by immunohistochemical methods using antibody PAb 1801, was noted in 29.8% of the cases and was associated with estrogen receptor (ER) negativity (P = 0.0003), progesterone receptor (PR) negativity (P = 0.008), and high histological grade (P = 0.037) by univariate analysis. Incorporation of bromodeoxyuridine was used to determine the percentage of cells synthesizing DNA (proliferative fraction). When bromodeoxyuridine was administered either in vivo (n = 93) or in vitro (n = 79), p53 accumulation was only marginally related to proliferative fraction (P = 0.067 by chi(2); P = 0.055 by Mann-Whitney). When tumors were segregated by ER status, the aforementioned associations of p53 immunopositivity with PR negativity, high histological grade, and increased proliferation rate lost their significance. p53 accumulation did not correlate with tumor size, clinical stage, axillary node metastases, or age at diagnosis. Three of ten exclusively intraductal carcinomas (two of which were of the comedo type) were immunopositive for p53. There was complete concordance between p53 immunopositivity of primary invasive lesions and concurrent lymph node metastases (24 cases examined). These observations suggest that p53 mutations usually are acquired at a stage in malignant progression prior to invasive carcinoma. Additionally, the fact that immunohistochemistry detected the majority of tumors with p53 mutations suggests that missense mutations leading to an altered gene product, rather than nonsense mutations, are the most frequent form of p53 alterations in breast cancer. C1 CALIFORNIA PACIFIC MED CTR,GERALDINE BRUSH CANC RES INST,SAN FRANCISCO,CA 94115. UNIV CALIF SAN FRANCISCO,DEPT PATHOL,SAN FRANCISCO,CA. UNIV CALIF SAN FRANCISCO,DEPT SURG,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT MED,SAN FRANCISCO,CA. UNIV CALIF SAN FRANCISCO,DEPT LAB MED,SAN FRANCISCO,CA 94143. MASSACHUSETTS GEN HOSP,DEPT PATHOL,BOSTON,MA 02114. HARVARD UNIV,SCH MED,BOSTON,MA. LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. FU NCI NIH HHS [P01 CA44768] NR 31 TC 49 Z9 49 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0893-3952 J9 MODERN PATHOL JI Mod. Pathol. PD APR PY 1994 VL 7 IS 3 BP 361 EP 368 PG 8 WC Pathology SC Pathology GA NK273 UT WOS:A1994NK27300014 PM 8058709 ER PT J AU KAUFMANN, EN AF KAUFMANN, EN TI POLICY, POLEMICS, PLATITUDES, PARENTHOOD, AND PREACHING TO THE CHOIR [ALL MEANT IN THE BEST POSSIBLE WAY] SO MRS BULLETIN LA English DT Editorial Material RP KAUFMANN, EN (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD APR PY 1994 VL 19 IS 4 BP 3 EP 4 PG 2 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA NH611 UT WOS:A1994NH61100001 ER PT J AU SCHAEFER, DW AF SCHAEFER, DW TI ENGINEERED POROUS MATERIALS SO MRS BULLETIN LA English DT Article ID MICROCELLULAR FOAMS; LOW-DENSITY RP SCHAEFER, DW (reprint author), SANDIA NATL LABS,DEPT MAT RES ENERGY & ENVIRONM TECHNOL,ALBUQUERQUE,NM 87185, USA. NR 23 TC 36 Z9 36 U1 1 U2 6 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 APR PY 1994 VL 19 IS 4 BP 14 EP 17 PG 4 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA NH611 UT WOS:A1994NH61100003 ER PT J AU EVEN, WR GREGORY, DP AF EVEN, WR GREGORY, DP TI EMULSION-DERIVED FOAMS - PREPARATION, PROPERTIES, AND APPLICATION SO MRS BULLETIN LA English DT Article ID STABILIZATION C1 UNILEVER RES,PERSONAL PROD & CONSUMER SCI RES GRP,BEBINGTON,ENGLAND. RP EVEN, WR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 16 TC 41 Z9 41 U1 0 U2 4 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 APR PY 1994 VL 19 IS 4 BP 29 EP 33 PG 5 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA NH611 UT WOS:A1994NH61100006 ER PT J AU FAIN, DE AF FAIN, DE TI MEMBRANE GAS SEPARATION PRINCIPLES SO MRS BULLETIN LA English DT Article RP FAIN, DE (reprint author), OAK RIDGE GASEOUS DIFFUS PLANT,MARTIN MARIETTA ENERGY SYST,DEPT MEMBRANE TECHNOL,OAK RIDGE,TN, USA. RI Hernandez, Antonio/B-4622-2012 OI Hernandez, Antonio/0000-0002-2475-5681 NR 6 TC 17 Z9 18 U1 0 U2 4 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 APR PY 1994 VL 19 IS 4 BP 40 EP 43 PG 4 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA NH611 UT WOS:A1994NH61100008 ER PT J AU SMITH, DM HUA, DW EARL, WL AF SMITH, DM HUA, DW EARL, WL TI CHARACTERIZATION OF POROUS SOLIDS SO MRS BULLETIN LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; SPIN-LATTICE RELAXATION; PORE STRUCTURE; XE-129 NMR; X-RAY; XENON; SCATTERING; DIFFUSION; POROSITY; SYSTEMS C1 LOS ALAMOS NATL LAB,ANALYT CHEM GRP,LOS ALAMOS,NM 87544. RP SMITH, DM (reprint author), UNIV NEW MEXICO,NATL SCI FDN CTR MICROENGINEERED CERAM,ALBUQUERQUE,NM 87131, USA. NR 31 TC 19 Z9 19 U1 1 U2 3 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 APR PY 1994 VL 19 IS 4 BP 44 EP 48 PG 5 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA NH611 UT WOS:A1994NH61100009 ER PT J AU SCHAEFER, DW AF SCHAEFER, DW TI STRUCTURE OF MESOPOROUS AEROGELS SO MRS BULLETIN LA English DT Article ID SILICA CONDENSATION POLYMERS; LOW-DENSITY; SCATTERING; GROWTH; SANS RP SCHAEFER, DW (reprint author), SANDIA NATL LABS,DEPT MAT RES ENERGY & ENVIRONM TECHNOL,ALBUQUERQUE,NM 87185, USA. NR 50 TC 15 Z9 15 U1 2 U2 2 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 APR PY 1994 VL 19 IS 4 BP 49 EP 53 PG 5 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA NH611 UT WOS:A1994NH61100010 ER PT J AU GREENE, RH AF GREENE, RH TI BWR CONTROL ROD DRIVE SYSTEM AGING SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB This Phase I Nuclear Plant Aging Research (NPAR) study examines the aging phenomena associated with BWR control rod drive mechanisms (CRDMs) and assesses the merits of various methods of ''managing'' this aging. Information for this study was acquired from (1) the results of a special CRDM aging questionnaire distributed to each U.S. BWR utility, (2) a first-of-its-kind workshop held to discuss CRDM aging and maintenance concerns, (3) an analysis of the Nuclear Plant Reliability Data System (NPRDS) failure cases attributed to the control rod drive (CRD) system, and (4) personal information exchange with nuclear industry CRDM maintenance experts. The report documenting the findings of this research, NUREG-5699, will be published this year. Nearly 23% of the NPRDS CRD system component failure reports were attributed to the CRDM. The CRDM components most often requiring replacement due to aging are the Graphitar seals. The predominant causes of aging for these seals are mechanical wear and thermal embrittlement. More than 59% of the NPRDS CRD system failure reports were attributed to components that comprise the hydraulic control unit (HCU). The predominant HCU components affected by the effects of service wear and aging are valve seals, discs, seats, stems, packing, and diaphragms. RP GREENE, RH (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 5 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD APR PY 1994 VL 147 IS 3 BP 321 EP 335 DI 10.1016/0029-5493(94)90215-1 PG 15 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NN710 UT WOS:A1994NN71000008 ER PT J AU BROWN, DP BLAHNIK, DE BURNS, JJ AF BROWN, DP BLAHNIK, DE BURNS, JJ TI SNUBBER AGING ASSESSMENT SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB Snubbers are safety-related devices used to restrain undesirable dynamic loads at various piping and equipment locations in nuclear power plants (NPPs). Each snubber must accommodate a plant's normal thermal movements and be capable of restraining the maximum off-normal dynamic loads postulated for its specific location. The effects of snubber aging and the environments and mechanisms that degrade snubber performance need to be better understood. This paper describes the Phase II Nuclear Plant Aging Research Program in-plant aging research conducted to enhance the understanding of snubber aging and its consequences. Pacific Northwest Laboratory staff and their subcontractors, Lake Engineering and Wyle Laboratories, visited eight sites (encompassing thirteen plants) to conduct interviews with NPP staff and to collect snubber aging, testing, and maintenance data. The research methodology, evaluations, results, conclusions, and recommendations are described in the paper. Effective methods for service-life monitoring of snubbers are included in the recommendations. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. US NUCL REGULATORY COMMISS, ROCKVILLE, MD USA. RP BROWN, DP (reprint author), LAKE ENGN CO, GREENVILLE, RI USA. NR 2 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD APR PY 1994 VL 147 IS 3 BP 351 EP 357 DI 10.1016/0029-5493(94)90217-8 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NN710 UT WOS:A1994NN71000010 ER PT J AU LOFARO, RJ AF LOFARO, RJ TI DETECTING AND MITIGATING AGING IN COMPONENT COOLING WATER-SYSTEMS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB The time-dependent effects of aging on component cooling water (CCW) systems in nuclear power plants has been studied and documented as part of a research program sponsored by the U.S. Nuclear Regulatory Commission. It was found that age related degradation leads to failures in the CCW system which can result in an increase in system unavailability, if not properly detected and mitigated. To identify effective methods of managing this degradation, information on inspection, monitoring, and maintenance practices currently available was obtained from various operating plants and reviewed. The findings were correlated with the most common aging mechanisms and failure modes, and a compilation of aging detection and mitigation practices was formulated. This paper discusses the results of this work. RP LOFARO, RJ (reprint author), BROOKHAVEN NATL LAB,DEPT NUCL ENERGY,BLDG 130,UPTON,NY 11973, USA. NR 2 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD APR PY 1994 VL 147 IS 3 BP 375 EP 383 DI 10.1016/0029-5493(94)90220-8 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NN710 UT WOS:A1994NN71000013 ER PT J AU HEARST, JR CARLSON, RC AF HEARST, JR CARLSON, RC TI A COMPARISON OF THE MOISTURE GAUGE AND THE NEUTRON LOG IN AIR-FILLED MOLES SO NUCLEAR GEOPHYSICS LA English DT Article AB The soil science, agriculture and construction industries measure the water content of a formation using a moisture gauge characterized by a neutron count rate which increases with increasing water content. The petroleum industry uses a neutron log, with a count rate which decreases with increasing water content: the two techniques have never been directly compared. In an air-filled hole, the neutron log is significantly more sensitive to water content than the moisture gauge below about 10 vol%, and the moisture gauge is significantly more sensitive between about 30 and 60 vol%. Effects of hole size, thermal neutron absorbers, sonde-wall gap, and density are similar for the two tools. RP HEARST, JR (reprint author), LAWRENCE LIVERMORE NATL LAB,MAIL STOP L221,POB 808,LIVERMORE,CA 94551, USA. NR 0 TC 5 Z9 5 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0969-8086 J9 NUCL GEOPHYS JI Nucl. Geophys. PD APR PY 1994 VL 8 IS 2 BP 165 EP 172 PG 8 WC Geochemistry & Geophysics; Nuclear Science & Technology; Mining & Mineral Processing SC Geochemistry & Geophysics; Nuclear Science & Technology; Mining & Mineral Processing GA NF119 UT WOS:A1994NF11900004 ER PT J AU ABE, K ANTILOGUS, P ASTON, D BAIRD, K BEAN, A BENDAVID, R BIENZ, T BIRD, F CALDWELL, DO CAVALLISFORZA, M COLLER, J COYLE, P COYNE, D DASU, S DOLINSKY, S DOLIVEIRA, A DUBOSCQ, J DUNWOODIE, W HALLEWELL, G HASEGAWA, K HASEGAWA, Y HUBER, J IWASAKI, Y JACQUES, P JOHNSON, RA KALELKAR, M KAWAHARA, H KWON, Y LEITH, DWGS LIU, X LU, A MANLEY, S MARTINEZ, J MATHYS, L MCHUGH, S MEADOWS, B MULLER, G MULLER, D NAGAMINE, T NUSSBAUM, M PAVEL, TJ PLANO, R RATCLIFF, B RENSING, P SANTHA, AKS SCHULTZ, D SHANK, JT SHAPIRO, S SIMOPOULOS, C SNYDER, J SOKOLOFF, MD SOLODOV, E STAMER, P STOCKDALE, I SUEKANE, F TOGE, N TURK, J VAVRA, J WHITAKER, JS WILLIAMS, DA WILLIAMS, SH WILSON, RJ WORD, G YELLIN, S YUTA, H AF ABE, K ANTILOGUS, P ASTON, D BAIRD, K BEAN, A BENDAVID, R BIENZ, T BIRD, F CALDWELL, DO CAVALLISFORZA, M COLLER, J COYLE, P COYNE, D DASU, S DOLINSKY, S DOLIVEIRA, A DUBOSCQ, J DUNWOODIE, W HALLEWELL, G HASEGAWA, K HASEGAWA, Y HUBER, J IWASAKI, Y JACQUES, P JOHNSON, RA KALELKAR, M KAWAHARA, H KWON, Y LEITH, DWGS LIU, X LU, A MANLEY, S MARTINEZ, J MATHYS, L MCHUGH, S MEADOWS, B MULLER, G MULLER, D NAGAMINE, T NUSSBAUM, M PAVEL, TJ PLANO, R RATCLIFF, B RENSING, P SANTHA, AKS SCHULTZ, D SHANK, JT SHAPIRO, S SIMOPOULOS, C SNYDER, J SOKOLOFF, MD SOLODOV, E STAMER, P STOCKDALE, I SUEKANE, F TOGE, N TURK, J VAVRA, J WHITAKER, JS WILLIAMS, DA WILLIAMS, SH WILSON, RJ WORD, G YELLIN, S YUTA, H TI PERFORMANCE OF THE CRID AT SLD SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 1st Workshop on Ring Imaging Cherenkov Detectors CY JUN 02-05, 1993 CL BARI, ITALY ID RING-IMAGING DETECTOR; CONSTRUCTION AB This paper describes the performance of a large 4pi Cherenkov Ring Imaging Detector (CRID) in the SLD experiment at the SLC at SLAC. We compare the most recent SLD results with those obtained during the R&D period, discuss various design features, and highlight some specific lessons derived from three years of operation. C1 STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. TOHOKU UNIV,DEPT PHYS,SENDAI,MIYAGI 980,JAPAN. RUTGERS STATE UNIV,SERIN PHYS LAB,PISCATAWAY,NJ 08855. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. YALE UNIV,DEPT PHYS,NEW HAVEN,CT 06511. UNIV CALIF SANTA CRUZ,SANTA CRUZ INST PARTICLE PHYS,SANTA CRUZ,CA 95064. BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215. UNIV CINCINNATI,DEPT PHYS,CINCINNATI,OH 45221. COLORADO STATE UNIV,DEPT PHYS,FT COLLINS,CO 80523. RI Cavalli-Sforza, Matteo/H-7102-2015; OI Dolinsky, Sergei/0000-0002-2789-453X; Bean, Alice/0000-0001-5967-8674; Wilson, Robert/0000-0002-8184-4103 NR 35 TC 53 Z9 53 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 APR 1 PY 1994 VL 343 IS 1 BP 74 EP 86 DI 10.1016/0168-9002(94)90536-3 PG 13 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA ND072 UT WOS:A1994ND07200007 ER PT J AU ANDERSON, DF KWAN, S PESKOV, V AF ANDERSON, DF KWAN, S PESKOV, V TI CSI AND SOME NEW PHOTOCATHODES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 1st Workshop on Ring Imaging Cherenkov Detectors CY JUN 02-05, 1993 CL BARI, ITALY ID PRESSURE WIRE CHAMBER; LARGE-AREA; TMAE; EXTRACTION; DETECTOR; LIQUID; FILMS; RICH AB A discussion of the possible sources of discrepancies in the measurements of the quantum efficiency of CsI photocathodes is presented. We propose that the major causes for disagreements in QE are due to the QE dependence on the current density extracted from the photocathode, on the electric field, and on the temperature of the photocathode. Preliminary results on TMAE enhanced GaAs and Si, plus TMAE protected CsTe and SbCs photocathodes, operated in gas, are also presented. C1 FERMILAB NATL ACCELERATOR LAB,PARTICLE DETECTOR GRP,BATAVIA,IL 60510. NR 28 TC 18 Z9 18 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 APR 1 PY 1994 VL 343 IS 1 BP 109 EP 116 DI 10.1016/0168-9002(94)90539-8 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA ND072 UT WOS:A1994ND07200010 ER PT J AU APRILE, E BOLOTNIKOV, A CHEN, D MUKHERJEE, R XU, F ANDERSON, DF PESKOV, V AF APRILE, E BOLOTNIKOV, A CHEN, D MUKHERJEE, R XU, F ANDERSON, DF PESKOV, V TI ELECTRON EXTRACTION FROM A CSI PHOTOCATHODE INTO CONDENSED XE, KR, AND AR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 1st Workshop on Ring Imaging Cherenkov Detectors CY JUN 02-05, 1993 CL BARI, ITALY ID LIQUIDS AB We have studied the electron extraction from a CsI photocathode into gaseous (0-55 atm) and liquid Xe, Kr, and Ar. Two experimental setups were used. In the first one the photocathode was irradiated with a UV lamp and the photocurrent was directly measured. In the liquid phase, the QE was 2-3 times higher than that in vacuum for LXe and LKr. In LAr, 50% of the vacuum value was achieved. For Xe at a pressure higher than 50 atm, we observed that the QE increased with increasing pressure and gave a value higher than that measured in vacuum. In the second setup, 5.5 MeV alpha particles were used as the source of ionization and scintillation in the liquids, and both the charge and scintillation signals were measured. From the scintillation signal, the intrinsic energy resolution was measured to be 2.8%, 5.2% and 8.4% FWHM, respectively, in LXe, LKr and LAr. Stable operation was demonstrated for all three cryogenic liquids. C1 FERMILAB NATL ACCELERATOR LAB,PARTICLE DETECTOR GRP,BATAVIA,IL 60510. RP APRILE, E (reprint author), COLUMBIA UNIV,DEPT PHYS,NEW YORK,NY 10027, USA. NR 14 TC 20 Z9 20 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD APR 1 PY 1994 VL 343 IS 1 BP 129 EP 134 DI 10.1016/0168-9002(94)90542-8 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA ND072 UT WOS:A1994ND07200013 ER PT J AU BAECHLER, J BUNCIC, P BOCK, R DIMAURO, A HECK, W HOFFMANN, M LEVINE, M LJUBICIC, A NAPPI, E PAIC, G PANAGIOTOU, A POSA, F ROLAND, G RUNGE, K SANDOVAL, A SCOGNETTI, T SCHMOETTEN, E STOCK, R TOMASICCHIO, G VASILEIADIS, G VRANIC, D AF BAECHLER, J BUNCIC, P BOCK, R DIMAURO, A HECK, W HOFFMANN, M LEVINE, M LJUBICIC, A NAPPI, E PAIC, G PANAGIOTOU, A POSA, F ROLAND, G RUNGE, K SANDOVAL, A SCOGNETTI, T SCHMOETTEN, E STOCK, R TOMASICCHIO, G VASILEIADIS, G VRANIC, D TI AN OPTICAL READOUT RICH DETECTOR FOR THE NA35 HEAVY-ION EXPERIMENT SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB A 50 X 50 cm2 RICH detector prototype with optical readout has been tested during the 1992 S-32 run period at the CERN SPS, to provide particle identification in the momentum range 1.5-4.0 GeV/c. Construction details and results of the analysis of the CCD images are discussed, taking reconstruction algorithms and tracking predictions into account. C1 UNIV FREIBURG, W-7800 FREIBURG, GERMANY. BNL, UPTON, NY USA. GSI DARMSTADT, DARMSTADT, GERMANY. RUDJER BOSKOVIC INST, ZAGREB, CROATIA. INFN, BARI, ITALY. POLITECN BARI, BARI, ITALY. UNIV FRANKFURT, W-6000 FRANKFURT, GERMANY. UNIV ATHENS, ATHENS, GREECE. NR 7 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD APR 1 PY 1994 VL 343 IS 1 BP 213 EP 217 DI 10.1016/0168-9002(94)90553-3 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA ND072 UT WOS:A1994ND07200024 ER PT J AU BACHLER, J BUNCIC, P BOCK, R DIMAURO, A HECK, W HOFFMANN, M KONCUL, M LEVINE, M LJUBICIC, A NAPPI, E PAIC, G PANAGIOTOU, A POSA, F ROLAND, G RUNGE, K SANDOVAL, A SCOGNETTI, T SCHMOETTEN, E STOCK, R TOMASICCHIO, G VASILEIADIS, G VRANIC, D WENSVEEN, M AF BACHLER, J BUNCIC, P BOCK, R DIMAURO, A HECK, W HOFFMANN, M KONCUL, M LEVINE, M LJUBICIC, A NAPPI, E PAIC, G PANAGIOTOU, A POSA, F ROLAND, G RUNGE, K SANDOVAL, A SCOGNETTI, T SCHMOETTEN, E STOCK, R TOMASICCHIO, G VASILEIADIS, G VRANIC, D WENSVEEN, M TI RECONSTRUCTION OF CHERENKOV RINGS IN IMAGING DETECTORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 1st Workshop on Ring Imaging Cherenkov Detectors CY JUN 02-05, 1993 CL BARI, ITALY AB A simulation and reconstruction method is presented which enables particle identification in a multihit environment with a RICH detector even in the case where the particle hit point on the detector is not precisely determined. The method is demonstrated for the configuration of the NA35 experiment. C1 BNL,UPTON,NY. UNIV ATHENS,ATHENS,GREECE. POLITECN BARI,BARI,ITALY. INFN,BARI,ITALY. GSI DARMSTADT,DARMSTADT,GERMANY. RUDJER BOSKOVIC INST,ZAGREB,CROATIA. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV FRANKFURT,W-6000 FRANKFURT,GERMANY. RP BACHLER, J (reprint author), UNIV ATHENS,ATHENS,GREECE. NR 2 TC 4 Z9 4 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 APR 1 PY 1994 VL 343 IS 1 BP 273 EP 275 DI 10.1016/0168-9002(94)90563-0 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA ND072 UT WOS:A1994ND07200034 ER PT J AU BACHLER, J BARTKE, J BIALKOWSKA, H BOCK, R BROCKMANN, R BUNCIC, P CHASE, SI DERADO, I ECKARDT, V ESCHKE, J FERENC, D FLEISCHMANN, B FUCHS, M GAZDZICKI, M GEBAUER, HJ GLADYSZ, E HARRIS, JW HECK, W HOFFMANN, M KABANA, S KADIJA, K KEIDEL, R KOSIEC, J KOWALSKI, M KUHMICHEL, A LAHANAS, M LEE, Y LEVINE, M LJUBICIC, A MARGETIS, S NAPPI, E ODYNIEC, G PAIC, G PANAGIOTOU, AD PETRIDIS, A PFENNIG, J PIPER, A POSA, F PUHLHOFER, F RAI, G RAUCH, W RENFORDT, R ROHRICH, D ROTHARD, H RUNGE, K SANDOVAL, A SCHMIDT, E SCHMITZ, N SCHMOETTEN, E SCHNEIDER, I SEYBOTH, P SEYERLEIN, J SKRZYPCAK, E STOCK, R STROBELE, H TEITELBAUM, L THOMAS, A TONSE, S VASILEIADIS, G VESZTERGOMBI, G VRANIC, D WENIG, S AF BACHLER, J BARTKE, J BIALKOWSKA, H BOCK, R BROCKMANN, R BUNCIC, P CHASE, SI DERADO, I ECKARDT, V ESCHKE, J FERENC, D FLEISCHMANN, B FUCHS, M GAZDZICKI, M GEBAUER, HJ GLADYSZ, E HARRIS, JW HECK, W HOFFMANN, M KABANA, S KADIJA, K KEIDEL, R KOSIEC, J KOWALSKI, M KUHMICHEL, A LAHANAS, M LEE, Y LEVINE, M LJUBICIC, A MARGETIS, S NAPPI, E ODYNIEC, G PAIC, G PANAGIOTOU, AD PETRIDIS, A PFENNIG, J PIPER, A POSA, F PUHLHOFER, F RAI, G RAUCH, W RENFORDT, R ROHRICH, D ROTHARD, H RUNGE, K SANDOVAL, A SCHMIDT, E SCHMITZ, N SCHMOETTEN, E SCHNEIDER, I SEYBOTH, P SEYERLEIN, J SKRZYPCAK, E STOCK, R STROBELE, H TEITELBAUM, L THOMAS, A TONSE, S VASILEIADIS, G VESZTERGOMBI, G VRANIC, D WENIG, S TI STUDY OF PARTICLE SPECTRA WITH AN OPTICALLY READOUT RICH DETECTOR IN THE NA35 EXPERIMENT SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 1st Workshop on Ring Imaging Cherenkov Detectors CY JUN 02-05, 1993 CL BARI, ITALY AB The first identified particle spectra obtained with a proximity focusing RICH detector using an optical readout in the high particle density environment of heavy ion collisions at ultrarelativistic energies are presented. The rapidity and transverse momentum spectra of identified pions, kaons, and protons measured in the reaction S-Au at 200 GeV/nucleon are shown and compared with the predictions of two event generators (Fritiof and VENUS). C1 CERN,CH-1211 GENEVA,SWITZERLAND. UNIV ATHENS,ATHENS,GREECE. INFN,SEZ BARI,BARI,ITALY. UNIV BARI,I-70124 BARI,ITALY. INST NUCL PHYS,PL-31342 KRAKOW,POLAND. GSI DARMSTADT,DARMSTADT,GERMANY. UNIV FRANKFURT,W-6000 FRANKFURT,GERMANY. UNIV FREIBURG,W-7800 FREIBURG,GERMANY. MPI EXTRATERR PHYS,MUNICH,GERMANY. UNIV WARSAW,INST EXPTL PHYS,PL-00325 WARSAW,POLAND. INST NUCL STUDIES,WARSAW,POLAND. RBI,ZAGREB,CROATIA. BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 3 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD APR 1 PY 1994 VL 343 IS 1 BP 288 EP 291 DI 10.1016/0168-9002(94)90567-3 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA ND072 UT WOS:A1994ND07200038 ER PT J AU COYLE, P KAWAHARA, H LU, A LYNCH, G MUELLER, G MULLER, D RATCLIFF, B SIMOPOULOS, C AF COYLE, P KAWAHARA, H LU, A LYNCH, G MUELLER, G MULLER, D RATCLIFF, B SIMOPOULOS, C TI THE DIRC COUNTER - A NEW-TYPE OF PARTICLE IDENTIFICATION DEVICE FOR B-FACTORIES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 1st Workshop on Ring Imaging Cherenkov Detectors CY JUN 02-05, 1993 CL BARI, ITALY ID LIGHT AB A very thin, solid radiator, totally internally reflecting, imaging Cherenkov counter (DIRC) is described. This device is well matched to the hadronic charged particle identification requirements at an asymmetric e+e- B factory. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP COYLE, P (reprint author), CTR PHYS PARTICULES MARSEILLE,F-13288 MARSEILLE,FRANCE. NR 18 TC 53 Z9 53 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 APR 1 PY 1994 VL 343 IS 1 BP 292 EP 299 DI 10.1016/0168-9002(94)90568-1 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA ND072 UT WOS:A1994ND07200039 ER PT J AU VANHECKE, H AF VANHECKE, H TI A SPOT IMAGING CHERENKOV COUNTER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 1st Workshop on Ring Imaging Cherenkov Detectors CY JUN 02-05, 1993 CL BARI, ITALY AB A design for a Cherenkov detector is proposed, which provides at the hardware level, identification of incident kaons and pions, and in addition images their position. The device uses conventional components in a novel arrangement. RP VANHECKE, H (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 0 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD APR 1 PY 1994 VL 343 IS 1 BP 311 EP 315 DI 10.1016/0168-9002(94)90571-1 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA ND072 UT WOS:A1994ND07200042 ER PT J AU KAPLAN, DM ISENHOWER, LD ATAC, M BROWN, CN DARDEN, CW AF KAPLAN, DM ISENHOWER, LD ATAC, M BROWN, CN DARDEN, CW TI A FAST RING-IMAGING CHERENKOV COUNTER FOR A FIXED-TARGET HEAVY-QUARK EXPERIMENT SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 1st Workshop on Ring Imaging Cherenkov Detectors CY JUN 02-05, 1993 CL BARI, ITALY ID LIGHT PHOTON COUNTERS; SCINTILLATING FIBERS; TRACKING; TRIGGER; BEAUTY AB We present a design for a fast ring-imaging Cherenkov counter operating in the visible. The Cherenkov photons are imaged on an array of small Winston cones and read out with optical fibers and VLPCs. The design is optimized for pi/K/p separation in the range 10 < p < 100 GeV/c. C1 ABILENE CHRISTIAN UNIV,ABILENE,TX 79699. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV S CAROLINA,COLUMBIA,SC 29208. RP KAPLAN, DM (reprint author), NO ILLINOIS UNIV,DE KALB,IL 60115, USA. NR 14 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD APR 1 PY 1994 VL 343 IS 1 BP 316 EP 318 DI 10.1016/0168-9002(94)90572-X PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA ND072 UT WOS:A1994ND07200043 ER PT J AU KIRZ, J ADE, H ANDERSON, E BUCKLEY, C CHAPMAN, H HOWELLS, M JACOBSEN, C KO, CH LINDAAS, S SAYRE, D WILLIAMS, S WIRICK, S ZHANG, X AF KIRZ, J ADE, H ANDERSON, E BUCKLEY, C CHAPMAN, H HOWELLS, M JACOBSEN, C KO, CH LINDAAS, S SAYRE, D WILLIAMS, S WIRICK, S ZHANG, X TI NEW RESULTS IN SOFT-X-RAY MICROSCOPY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 16th International Conference on X-ray and Inner-Shell Process (X 93) CY JUL 12-16, 1993 CL HUNGARIAN ACAD SCI, INST NUCL RES, DEBRECEN, HUNGARY SP CITY DEBRECEN, CTY HAJDU BIHAR, EUROPEAN PHYS SOC, HUNGARY ACAD SCI, INT SCI FDN, INT UNION PURE & APPL PHYS, PROFESSOR KAZUOSHI WAKIYA, MINIST IND & TRADE HUNGARY, NATL COMM TECHNOL DEV HUNGARY, SOROS FDN, UNIV DEBRECEN HO HUNGARIAN ACAD SCI, INST NUCL RES AB Inner shell processes in the light elements provide the contrast mechanisms for soft X-ray microscopy. Bright X-ray sources and precision focusing elements have led to the development of high resolution instruments. Our efforts in scanning microscopy, holography and diffraction at the National Synchrotron Light Source are aimed at the development of microimaging techniques mostly for biological specimens. C1 N CAROLINA STATE UNIV,RALEIGH,NC 27695. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV LONDON KINGS COLL,LONDON WC2R 2LS,ENGLAND. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP KIRZ, J (reprint author), SUNY STONY BROOK,STONY BROOK,NY 11794, USA. RI Chapman, Henry/G-2153-2010; Ade, Harald/E-7471-2011; Jacobsen, Chris/E-2827-2015; OI Chapman, Henry/0000-0002-4655-1743; Jacobsen, Chris/0000-0001-8562-0353; Zhang, Xiaodong/0000-0001-9786-7038 NR 40 TC 20 Z9 20 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 1994 VL 87 IS 1-4 BP 92 EP 97 DI 10.1016/0168-583X(94)95242-6 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NJ597 UT WOS:A1994NJ59700015 ER PT J AU WINICK, H AF WINICK, H TI HIGH-ENERGY SYNCHROTRON-RADIATION SOURCES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 16th International Conference on X-ray and Inner-Shell Process (X 93) CY JUL 12-16, 1993 CL HUNGARIAN ACAD SCI, INST NUCL RES, DEBRECEN, HUNGARY SP CITY DEBRECEN, CTY HAJDU BIHAR, EUROPEAN PHYS SOC, HUNGARY ACAD SCI, INT SCI FDN, INT UNION PURE & APPL PHYS, PROFESSOR KAZUOSHI WAKIYA, MINIST IND & TRADE HUNGARY, NATL COMM TECHNOL DEV HUNGARY, SOROS FDN, UNIV DEBRECEN HO HUNGARIAN ACAD SCI, INST NUCL RES ID PROJECT AB In the world there are now about 43 laboratories in 16 countries engaged in the operation, construction or planning of electron storage rings, from a few hundred MeV to above 10 GeV, as sources of synchrotron radiation for basic and applied research. In this report we describe the new third generation high energy (i.e. hard X-ray) sources. The first of these, the 6 GeV European Synchrotron Radiation Facility (ESRF) in Grenoble, France started operation in mid 1992. The 7 GeV Advanced Photon Source (APS) at Argonne, USA and the 8 GeV Super Photon Ring (SPring-8) in Nishi Harima, Japan are expected to start operation for users around 1996-1998. RP WINICK, H (reprint author), STANFORD LINEAR ACCELERATOR CTR,STANFORD SYNCHROTRON RADIAT LAB,POB 4349,MS 69,STANFORD,CA 94309, USA. NR 18 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 1994 VL 87 IS 1-4 BP 112 EP 115 DI 10.1016/0168-583X(94)95245-0 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NJ597 UT WOS:A1994NJ59700018 ER PT J AU BRIAND, JP DETAT, B SCHNEIDER, D CLARK, M DECAUX, V AF BRIAND, JP DETAT, B SCHNEIDER, D CLARK, M DECAUX, V TI ON THE MECHANISM OF FORMATION OF HOLLOW ATOMS BELOW A SURFACE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 16th International Conference on X-ray and Inner-Shell Process (X 93) CY JUL 12-16, 1993 CL HUNGARIAN ACAD SCI, INST NUCL RES, DEBRECEN, HUNGARY SP CITY DEBRECEN, CTY HAJDU BIHAR, EUROPEAN PHYS SOC, HUNGARY ACAD SCI, INT SCI FDN, INT UNION PURE & APPL PHYS, PROFESSOR KAZUOSHI WAKIYA, MINIST IND & TRADE HUNGARY, NATL COMM TECHNOL DEV HUNGARY, SOROS FDN, UNIV DEBRECEN HO HUNGARIAN ACAD SCI, INST NUCL RES ID HIGHLY CHARGED IONS AB The interaction of Ar17+, Fe25+ and Kr35+ ions on surfaces has been studied by looking at the X-rays emitted in flight by the ions with a SiLi detector. A model has been developed to describe the behavior of the ions inside the solid and the formation of ''hollow atoms'' below the surface. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV PARIS 06,NUCL INST RADIUM,CNRS,URA 771,F-75252 PARIS 05,FRANCE. RP BRIAND, JP (reprint author), UNIV PARIS 06,PHYS ATOM LAB,4 PL JUSSIEU,F-75252 PARIS 05,FRANCE. NR 9 TC 18 Z9 18 U1 2 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 1994 VL 87 IS 1-4 BP 138 EP 141 DI 10.1016/0168-583X(94)95249-3 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NJ597 UT WOS:A1994NJ59700022 ER PT J AU SCHNEIDER, D BRIERE, MA MCDONALD, J SIEKHAUS, W AF SCHNEIDER, D BRIERE, MA MCDONALD, J SIEKHAUS, W TI OBSERVATION OF DEFECTS ON INSULATOR SURFACES FOLLOWING BOMBARDMENT WITH SLOW KR-35+, XE-44+, TH-74+ AND U-70+ IONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 16th International Conference on X-ray and Inner-Shell Process (X 93) CY JUL 12-16, 1993 CL HUNGARIAN ACAD SCI, INST NUCL RES, DEBRECEN, HUNGARY SP CITY DEBRECEN, CTY HAJDU BIHAR, EUROPEAN PHYS SOC, HUNGARY ACAD SCI, INT SCI FDN, INT UNION PURE & APPL PHYS, PROFESSOR KAZUOSHI WAKIYA, MINIST IND & TRADE HUNGARY, NATL COMM TECHNOL DEV HUNGARY, SOROS FDN, UNIV DEBRECEN HO HUNGARIAN ACAD SCI, INST NUCL RES ID HIGHLY CHARGED IONS; TRAP AB We found unambiguous evidence of a new radiation effect from the occurrence of single ion defects which are created through the interaction of the Coulombic potential of slow highly charged ions (e.g. Xe44+ and U70+) and the surface of solid insulating materials (i.e. mica). In the cases studied, the kinetic energy of the ions is some 300-500 keV (ca. 2.2 keV/u), while the energy associated with the electrostatic potential of the incident ions approaches 200 keV. Defect production in mica has been investigated as a function of incident ion charge using an atomic force microscope. The volume of ''blister-like'' defects has been found to be proportional to the incident ion charge. RP SCHNEIDER, D (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-421,LIVERMORE,CA 94550, USA. NR 21 TC 8 Z9 8 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 1994 VL 87 IS 1-4 BP 156 EP 161 DI 10.1016/0168-583X(94)95252-3 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NJ597 UT WOS:A1994NJ59700025 ER PT J AU ANDERSSON, LR BURGDORFER, J AF ANDERSSON, LR BURGDORFER, J TI SINGLE AND DOUBLE-IONIZATION OF HELIUM BY HIGH-ENERGY PHOTON IMPACT SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 16th International Conference on X-ray and Inner-Shell Process (X 93) CY JUL 12-16, 1993 CL HUNGARIAN ACAD SCI, INST NUCL RES, DEBRECEN, HUNGARY SP CITY DEBRECEN, CTY HAJDU BIHAR, EUROPEAN PHYS SOC, HUNGARY ACAD SCI, INT SCI FDN, INT UNION PURE & APPL PHYS, PROFESSOR KAZUOSHI WAKIYA, MINIST IND & TRADE HUNGARY, NATL COMM TECHNOL DEV HUNGARY, SOROS FDN, UNIV DEBRECEN HO HUNGARIAN ACAD SCI, INST NUCL RES ID DOUBLE PHOTOIONIZATION AB Production of singly and doubly charged helium ions by impact of keV photons is studied. The ratio R(ph) = sigma(ph)++/sigma(ph)+ for photoabsorption is calculated in the photon-energy range 2-18 keV using correlated initial- and final-state wave functions. Extrapolation towards asymptotic photon energies yields R(ph)(omega --> infinity) = 1.66% in agreement with previous predictions. Ionization due to Compton scattering, which becomes comparable to photoabsorption above omega approximately 3 keV, is discussed. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,OAK RIDGE,TN 37931. NR 24 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 1994 VL 87 IS 1-4 BP 167 EP 172 DI 10.1016/0168-583X(94)95254-X PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NJ597 UT WOS:A1994NJ59700027 ER PT J AU KRAUSE, MO AF KRAUSE, MO TI ELECTRON SPECTROMETRY OF OPEN-SHELL ATOMS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 16th International Conference on X-ray and Inner-Shell Process (X 93) CY JUL 12-16, 1993 CL HUNGARIAN ACAD SCI, INST NUCL RES, DEBRECEN, HUNGARY SP CITY DEBRECEN, CTY HAJDU BIHAR, EUROPEAN PHYS SOC, HUNGARY ACAD SCI, INT SCI FDN, INT UNION PURE & APPL PHYS, PROFESSOR KAZUOSHI WAKIYA, MINIST IND & TRADE HUNGARY, NATL COMM TECHNOL DEV HUNGARY, SOROS FDN, UNIV DEBRECEN HO HUNGARIAN ACAD SCI, INST NUCL RES ID RESOLVED PHOTOELECTRON SPECTROMETRY; IONIZATION CROSS-SECTION; PHOTO-IONIZATION; SYNCHROTRON RADIATION; SPECTROSCOPY; OXYGEN; CHLORINE; RANGE AB Following a brief general comparison of open-shell atoms with closed-shell atoms as probed with the aid of electron spectrometry, highlights are presented from the first wide-ranging studies of the prototype open-shell atoms chlorine and oxygen. The experimental approach, autoionization processes in Cl, population of fine-structure states in Cl, photoionization in the K shell of O, and deexcitation processes of K shell excited and ionized oxygen are discussed. RP KRAUSE, MO (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 28 TC 20 Z9 20 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 1994 VL 87 IS 1-4 BP 178 EP 182 DI 10.1016/0168-583X(94)95256-6 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NJ597 UT WOS:A1994NJ59700029 ER PT J AU BOZOIAN, M AF BOZOIAN, M TI PASCALS TRIANGLE AND THE SIMULATION OF BACKSCATTERING SPECTRA SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article AB Applying a well-known yield equation to a stack of very thin sublayers allows accurate simulations of homogeneous, thick-target. backscattering spectra. Explicit expressions, accurate to at least third degree in the areal density for the ion energy immediately before scattering and for the detected ion energy, are found. These expressions are in terms of binomial expansions of a quantity equaling the product of the areal density multiplied by a function of stopping cross section derivatives and areal density. One iterative parameter, taken as the near-surface yield, is required to properly normalize the simulation with respect to the experimental spectrum. Several thick target spectra, produced by bombarding helium ions with energies ranging over several MeV, are simulated using both Ziegler's 1977 [J.F. Ziegler, Helium Stopping Powers and Ranges in All Elements (Pergamon, New York, 1977)] and 1985 [J.F. Ziegler, J.P. Biersack and U. Littmark, The Stopping and Range of Ions in Solids (Pergamon, New York, 1985)] stopping compilations to ascertain the impact of these differing stopping cross sections on predictions of backscattering spectra. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 6 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 1994 VL 86 IS 3-4 BP 367 EP 372 DI 10.1016/0168-583X(94)95302-3 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NH556 UT WOS:A1994NH55600023 ER PT J AU GOCKSCH, A AF GOCKSCH, A TI DISORIENTED CHIRAL CONDENSATES IN HEAVY-ION COLLISIONS SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT 1993 International Symposium on Lattice Field Theory (LATTICE 93) CY OCT 12-16, 1993 CL DALLAS, TX ID HIGH-ENERGY; EMULSION CHAMBERS; SEARCH; FAMILIES; EVENTS AB A disoriented chiral condensate is a region in space in which the chiral order parameter points in a direction in isospin space which is different from that favored by the true vacuum. In this talk I review some recent work on a proposal by Rajagopal and Wilczek on how relativistic nuclear collisions can generate such domains. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. NR 25 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD APR PY 1994 SU 34 BP 113 EP 116 DI 10.1016/0920-5632(94)90325-5 PG 4 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500011 ER PT J AU GRANDY, J GUPTA, R AF GRANDY, J GUPTA, R TI GEOMETRIC MEASUREMENT OF TOPOLOGICAL SUSCEPTIBILITY ON LARGE LATTICES SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT 1993 International Symposium on Lattice Field Theory (LATTICE 93) CY OCT 12-16, 1993 CL DALLAS, TX ID WILSON FERMIONS; GAUGE-FIELDS; CHARGE AB The topological susceptibility of the quenched QCD vacuum is measured on large lattices for beta = 6.0, 6.2 and 6.4. Charges possibly induced by O(a) dislocations are identified and shown to have little effect on the measured susceptibility. As beta increases, fewer such questionable charges are found. Scaling is checked by examining the ratios of the susceptibility to three physical observables computed in Refs. [1-4] and LAMBDA(latt). C1 LOS ALAMOS NATL LAB,T8 GRP,LOS ALAMOS,NM 87545. NR 14 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD APR PY 1994 SU 34 BP 164 EP 166 DI 10.1016/0920-5632(94)90334-4 PG 3 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500020 ER PT J AU CHU, MC GRANDY, JM HUANG, S NEGELE, JW AF CHU, MC GRANDY, JM HUANG, S NEGELE, JW TI EVIDENCE FOR THE ROLE OF INSTANTONS IN HADRON STRUCTURE FROM LATTICE QCD SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT 1993 International Symposium on Lattice Field Theory (LATTICE 93) CY OCT 12-16, 1993 CL DALLAS, TX ID ANTIQUARK CHARGE-DISTRIBUTIONS; QUANTUM CHROMODYNAMICS; QUANTITATIVE THEORY; VACUUM; LIQUID; CONFINEMENT; MESONS; QUARKS AB Cooling is used as a filter on a set of gluon fields sampling the Wilson action to selectively remove essentially all fluctuations of the gluon field except for the instantons. The close agreement between quenched lattice QCD results with cooled and uncooled configurations for vacuum correlation functions of hadronic currents and for density-density correlation functions in hadronic bound states provides strong evidence for the dominant role of instantons in determining light hadron structure and quark propagation in the QCD vacuum. C1 CALTECH,KELLOGG RADIAT LAB,PASADENA,CA 91125. UNIV WASHINGTON,DEPT PHYS,SEATTLE,WA 98195. LOS ALAMOS NATL LAB,T8 GRP,LOS ALAMOS,NM 87545. MIT,CTR THEORET PHYS,NUCL SCI LAB,CAMBRIDGE,MA 02139. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. NR 27 TC 6 Z9 6 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 APR PY 1994 SU 34 BP 170 EP 175 DI 10.1016/0920-5632(94)90336-0 PG 6 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500022 ER PT J AU KOGUT, JB LOMBARDO, MP SINCLAIR, DK AF KOGUT, JB LOMBARDO, MP SINCLAIR, DK TI QUENCHED QCD AT FINITE-DENSITY SO NUCLEAR PHYSICS B LA English DT Article AB The spectrum of quenched lattice QCD at finite density is computed at a moderately low quark mass for values of the chemical potential ranging from 0 to congruent-to 1/2m(pi). No deviation is observed from the naively expected behaviour leading to the prediction mu(c) = 1/3m(N). C1 UNIV ILLINOIS, URBANA, IL 61801 USA. ARGONNE NATL LAB, ARGONNE, IL 60439 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD APR PY 1994 SU 34 BP 301 EP 303 DI 10.1016/0920-5632(94)90373-5 PG 3 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500059 ER PT J AU BHATTACHARYA, T GUPTA, R AF BHATTACHARYA, T GUPTA, R TI A POT-POURRI OF RESULTS IN QCD FROM LARGE LATTICE SIMULATIONS ON THE CM5 SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT 1993 International Symposium on Lattice Field Theory (LATTICE 93) CY OCT 12-16, 1993 CL DALLAS, TX AB We present a status report on simulations being done on 32(3) x 64 lattices at beta = 6.0 using quenched Wilson fermions. Results for the spectrum, decay constants, the kaon B-parameter B(K), and semi-leptonic form factors are given based on the current statistical sample of 28 configurations. These ''Grand Challenge'' calculations are being done on the CM5 at Los Alamos in collaboration with G. Kilcup, S. Sharpe and P. Tamayo. We end with a brief statement of the performance of our SIMD code on the CM5. C1 LOS ALAMOS NATL LAB,T8 GRP,LOS ALAMOS,NM 87545. RI Bhattacharya, Tanmoy/J-8956-2013 OI Bhattacharya, Tanmoy/0000-0002-1060-652X NR 10 TC 4 Z9 4 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 APR PY 1994 SU 34 BP 341 EP 346 DI 10.1016/0920-5632(94)90385-9 PG 6 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500071 ER PT J AU KIM, S SINCLAIR, DK AF KIM, S SINCLAIR, DK TI QUENCHED QCD SPECTRUM ON A 32(3) X 64 LATTICE SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT 1993 International Symposium on Lattice Field Theory (LATTICE 93) CY OCT 12-16, 1993 CL DALLAS, TX ID FERMIONS AB We present light hadron masses calculated from quenched QCD on a 32(3) x 64 lattice, using staggered quark sources of masses, m(q)a = 0.01, 0.005 and 0.0025. Results from beta = 6.0(preliminary) and those from beta = 6.5 are compared. Using m(rho)(m(q) = 0) and f(pi), we suggest that beta = 6.5 is in the asymptotic scaling region and beta = 6.0 result shows approximately 20% (bare coupling) or approximately 10% (improved coupling) scaling violation. Flavor symmetry appears to be restored at beta = 6.5. The estimated pion decay constant, f(pi), is 93(4) MeV at beta = 6.5, where the experimental value is 93 MeV. C1 ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439. NR 13 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD APR PY 1994 SU 34 BP 347 EP 349 PG 3 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500072 ER PT J AU BITAR, KM EDWARDS, R HELLER, UM KENNEDY, AD DEGRAND, T GOTTLIEB, S KOGUT, JB KRASNITZ, A LIU, W OGILVIE, MC RENKEN, RL SINCLAIR, DK SUGAR, RL TOUSSAINT, D WANG, KC AF BITAR, KM EDWARDS, R HELLER, UM KENNEDY, AD DEGRAND, T GOTTLIEB, S KOGUT, JB KRASNITZ, A LIU, W OGILVIE, MC RENKEN, RL SINCLAIR, DK SUGAR, RL TOUSSAINT, D WANG, KC TI SIMPLE MATRIX-ELEMENTS WITH DYNAMICAL FERMIONS SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT 1993 International Symposium on Lattice Field Theory (LATTICE 93) CY OCT 12-16, 1993 CL DALLAS, TX ID LATTICE AB We report on studies of simple matrix elements from simulations with two flavors of sea quarks, both staggered and Wilson. We show the decay constants of vector and pseudoscalar mesons. The effects of sea quarks are small. These simulations are done at relatively large lattice spacing compared to most quenched studies. C1 FLORIDA STATE UNIV,SCRI,TALLAHASSEE,FL 32306. INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47405. UNIV COLORADO,DEPT PHYS,BOULDER,CO 80309. SWISS FED INST TECHNOL,IPS,CH-8092 ZURICH,SWITZERLAND. THINKING MACHINES CORP,CAMBRIDGE,MA 02139. UNIV ARIZONA,DEPT PHYS,TUCSON,AZ 85721. UNIV NEW S WALES,SCH PHYS,KENSINGTON,NSW 2033,AUSTRALIA. UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. WASHINGTON UNIV,DEPT PHYS,ST LOUIS,MO 63130. UNIV CENT FLORIDA,DEPT PHYS,ORLANDO,FL 32816. ARGONNE NATL LAB,DIV HEP,ARGONNE,IL 60439. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. OI Heller, Urs M./0000-0002-2780-5584 NR 14 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD APR PY 1994 SU 34 BP 379 EP 382 PG 4 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500082 ER PT J AU HOCKNEY, GM AF HOCKNEY, GM TI FORM-FACTORS AND WAVE-FUNCTIONS IN COULOMB GAUGE SO NUCLEAR PHYSICS B LA English DT Article AB In the static approximation, the charge density distribution of the light quark in a heavy-light system is a physical observable. This form factor ([B\j(q)0(over arrow pointing right x)\B]) may be extracted from the lattice by putting the current at the light propagator source point and tying it to the static line a distance over arrow pointing right x away at some positive and negative time slice. When the heavy line connection is smeared at both ends using a source function derived from the Coulomb-gauge wave function, the result is a stable extraction of the charge density. C1 FERMILAB NATL ACCELERATOR LAB, THEORET PHYS GRP, BATAVIA, IL 60500 USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD APR PY 1994 SU 34 BP 386 EP 389 DI 10.1016/0920-5632(94)90398-0 PG 4 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500084 ER PT J AU MACKENZIE, PB AF MACKENZIE, PB TI THE LIGHT-QUARK MASSES SO NUCLEAR PHYSICS B LA English DT Article AB I discuss the improvement program for obtaining the physical, short-distance light quark masses from experiment using lattice methods. C1 FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. NR 13 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD APR PY 1994 SU 34 BP 400 EP 402 DI 10.1016/0920-5632(94)90402-2 PG 3 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500088 ER PT J AU MORNINGSTAR, CJ AF MORNINGSTAR, CJ TI THE IMPROVEMENT PROGRAM IN NONRELATIVISTIC LATTICE QCD SO NUCLEAR PHYSICS B LA English DT Article ID QUARK AB Progress in the improvement program in nonrelativistic lattice QCD is outlined. The leading radiative corrections to the heavy-quark mass renormalization, energy shift, and two important kinetic coupling coefficients are presented. The reliability of tadpole-improved perturbation theory in determining the energy shift and mass renormalization is demonstrated. C1 STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94305 USA. OI Morningstar, Colin/0000-0002-0607-9923 NR 8 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD APR PY 1994 SU 34 BP 425 EP 427 DI 10.1016/0920-5632(94)90407-3 PG 3 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500093 ER PT J AU BODWIN, GT KIM, S SINCLAIR, DK AF BODWIN, GT KIM, S SINCLAIR, DK TI MATRIX-ELEMENTS FOR THE DECAYS OF S-WAVE AND P-WAVE QUARKONIUM - AN EXPLORATORY-STUDY SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT 1993 International Symposium on Lattice Field Theory (LATTICE 93) CY OCT 12-16, 1993 CL DALLAS, TX ID QCD AB Bodwin, Braaten and Lepage have shown that, in a non-relativistic expansion in powers of the heavy-quark velocity, the decay rates of S- and P-wave quarkonia can be written as sums of products of a hard parton matrix element, which can be calculated perturbatively, times a low-momentum expectation value of a parton operator in the quarkonium state. We report on attempts to calculate these low momentum matrix elements on the lattice in the non-relativistic formulation of the quark dynamics. The quenched approximation is used throughout. C1 ARGONNE NATL LAB,DIV HEP,ARGONNE,IL 60439. NR 7 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD APR PY 1994 SU 34 BP 434 EP 436 PG 3 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500096 ER PT J AU DUNCAN, A EICHTEN, E FLYNN, JM HILL, BR THACKER, H AF DUNCAN, A EICHTEN, E FLYNN, JM HILL, BR THACKER, H TI MASSES AND DECAY CONSTANTS OF HEAVY-LIGHT MESONS USING THE MULTISTATE SMEARING TECHNIQUE SO NUCLEAR PHYSICS B LA English DT Article ID RENORMALIZATION AB We present results for f(B) and masses of low-lying heavy-light mesons. Calculations were performed in the quenched approximation using multistate smearing functions generated from a spinless relativistic quark model Hamiltonian. Beta values range from 5.7 to 6.3, and light quark masses corresponding to pion masses as low as 300 MeV are computed at each value. We use the 1P-1S charmonium splitting to set the overall scale. C1 UNIV PITTSBURGH, DEPT PHYS, PITTSBURGH, PA 15260 USA. FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. UNIV SOUTHAMPTON, DEPT PHYS, SOUTHAMPTON SO9 5NH, HANTS, ENGLAND. UNIV CALIF LOS ANGELES, DEPT PHYS, LOS ANGELES, CA 90024 USA. UNIV VIRGINIA, DEPT PHYS, CHARLOTTESVILLE, VA 22901 USA. NR 24 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD APR PY 1994 SU 34 BP 444 EP 452 PG 9 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500099 ER PT J AU MANDULA, JE OGILVIE, MC AF MANDULA, JE OGILVIE, MC TI A LATTICE CALCULATION OF THE HEAVY-QUARK UNIVERSAL FORM-FACTOR SO NUCLEAR PHYSICS B LA English DT Article ID MESONS; DECAYS AB A computation of the Isgur-Wise Universal Function using a lattice implementation of the heavy quark effective theory is described. C1 WASHINGTON UNIV, DEPT PHYS, ST LOUIS, MO 63130 USA. US DOE, DIV HIGH ENERGY PHYS, WASHINGTON, DC 20585 USA. NR 15 TC 15 Z9 15 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD APR PY 1994 SU 34 BP 480 EP 482 PG 3 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500109 ER PT J AU BERNARD, CW SHEN, Y SONI, A AF BERNARD, CW SHEN, Y SONI, A TI ISGUR-WISE FUNCTION ON THE LATTICE SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT 1993 International Symposium on Lattice Field Theory (LATTICE 93) CY OCT 12-16, 1993 CL DALLAS, TX ID DECAYS AB We review our method and numerical results for calculation of the Isgur-Wise function on the lattice. We present a discussion of the systematic errors. Using recent experimental results, we find V(cb) = 0.044 +/- 0.005 +/- .007. C1 WASHINGTON UNIV,DEPT PHYS,ST LOUIS,MO 63130. BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. NR 15 TC 6 Z9 6 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 APR PY 1994 SU 34 BP 483 EP 485 DI 10.1016/0920-5632(94)90424-3 PG 3 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500110 ER PT J AU KRONFELD, AS MERTENS, BP AF KRONFELD, AS MERTENS, BP TI RENORMALIZATION OF MASSIVE LATTICE FERMIONS SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT 1993 International Symposium on Lattice Field Theory (LATTICE 93) CY OCT 12-16, 1993 CL DALLAS, TX ID WILSON FERMIONS AB The renormalization of a general action for massive lattice fermions is discussed. The analysis applies for all m(q)a. Preliminary results for the self energy at one loop in perturbation theory are presented. C1 UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637. UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637. FERMILAB NATL ACCELERATOR LAB,THEORET PHYS GRP,BATAVIA,IL 60510. OI Kronfeld, Andreas/0000-0003-2716-1149 NR 5 TC 17 Z9 17 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 APR PY 1994 SU 34 BP 495 EP 498 DI 10.1016/0920-5632(94)90428-6 PG 4 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500114 ER PT J AU CREUTZ, M HORVATH, I AF CREUTZ, M HORVATH, I TI SURFACE-MODES AND CHIRAL-SYMMETRY (WILSON FERMIONS IN A BOX) SO NUCLEAR PHYSICS B LA English DT Article ID LATTICE QCD; ANOMALIES; BREAKING AB We give a Hamiltonian discussion of surface states in an extra dimension as a basis for chiral fermions in lattice models. Such modes appear with the Wilson fermion action when the hopping parameter exceeds a critical value. The association of such states with the closing and reopening of a band gap was noted by Shockley in 1939. C1 BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. NR 22 TC 8 Z9 8 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD APR PY 1994 SU 34 BP 583 EP 586 DI 10.1016/0920-5632(94)90452-9 PG 4 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500138 ER PT J AU BHATTACHARYA, T LACAZE, R MOREL, A AF BHATTACHARYA, T LACAZE, R MOREL, A TI THE FREE-ENERGY OF THE POTTS-MODEL SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT 1993 International Symposium on Lattice Field Theory (LATTICE 93) CY OCT 12-16, 1993 CL DALLAS, TX ID 1ST-ORDER PHASE-TRANSITIONS; MONTE-CARLO CALCULATION; FINITE AB We present a large q expansion of the 2d q-states Potts model free energies up to order 10 in 1/square-root q. Its analysis leads us to an ansatz which, in the first-order region, incorporates properties inferred from the known critical regime at q = 4, and predicts, for q > 4, the n(th) energy cumulant scales as the power (3n/2 - 2) of the correlation length. The parameter-free energy distributions reproduce accurately, without reference to any interface effect, the numerical data obtained in a simulation for q = 10 with lattices of linear dimensions up to L = 50. The pure phase specific heats are predicted to be much larger, at q less-than-or-equal-to 10, than the values extracted from current finite size scaling analysis of extrema. C1 LOS ALAMOS NATL LAB,GRP T8,LOS ALAMOS,NM 87545. SERV PHYS THEOR SACLAY,F-91191 GIF SUR YVETTE,FRANCE. RI Bhattacharya, Tanmoy/J-8956-2013 OI Bhattacharya, Tanmoy/0000-0002-1060-652X NR 19 TC 9 Z9 9 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 APR PY 1994 SU 34 BP 671 EP 673 DI 10.1016/0920-5632(94)90478-2 PG 3 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500164 ER PT J AU CREUTZ, M HORVATH, I MENDRIS, R AF CREUTZ, M HORVATH, I MENDRIS, R TI THE METHOD OF RECURSIVE COUNTING - CAN ONE GO FURTHER SO NUCLEAR PHYSICS B LA English DT Article ID TEMPERATURE AB After a short review of the Method of Recursive Counting we introduce a general algebraic description of recursive lattice building. This provides a rigorous framework for discussion of method's limitations. C1 BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. UNIV ROCHESTER, DEPT PHYS, ROCHESTER, NY 14627 USA. SLOVAK UNIV TECHNOL BRATISLAVA, FAC ELECT ENGN, DEPT MATH, CS-81219 BRATISLAVA, SLOVAKIA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD APR PY 1994 SU 34 BP 799 EP 801 DI 10.1016/0920-5632(94)90518-5 PG 3 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500204 ER PT J AU ARSENIN, I CHEN, D CHRIST, N EDWARDS, R GARA, A HANSEN, S KENNEDY, A MAWHINNEY, R PARSONS, J SEXTON, J AF ARSENIN, I CHEN, D CHRIST, N EDWARDS, R GARA, A HANSEN, S KENNEDY, A MAWHINNEY, R PARSONS, J SEXTON, J TI A 0.5 TERAFLOPS MACHINE OPTIMIZED FOR LATTICE QCD SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT 1993 International Symposium on Lattice Field Theory (LATTICE 93) CY OCT 12-16, 1993 CL DALLAS, TX AB We describe plans for a parallel computer composed of 16K nodes interconnected in a 16(3) x 4 mesh. Each node is made up of a Texas Instruments TMS320C31 digital signal processor, 0.5M words of error-corrected memory and a gate array providing memory management and inter-node communication. The machine will have a peak speed of 0.8Tflops and is estimated to sustain almost-equal-to 0.5Tflops for lattices as small as 32(3) x 8. We plan to complete the machine within two years for a cost of $3M. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. COLUMBIA UNIV,NEW YORK,NY 10027. FLORIDA STATE UNIV,SCRI,TALLAHASSEE,FL 32306. COLUMBIA UNIV,NEVIS LAB,IRVINGTON,NY. UNIV DUBLIN TRINITY COLL,DUBLIN 2,IRELAND. NR 1 TC 10 Z9 10 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 APR PY 1994 SU 34 BP 820 EP 822 DI 10.1016/0920-5632(94)90524-X PG 3 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500210 ER PT J AU FISCHLER, M AF FISCHLER, M TI EFFECTS OF AUTOMATED TRANSFER COALESCING ON PRODUCTION PHYSICS SO NUCLEAR PHYSICS B LA English DT Article AB Diverse lattice gauge applications coded using the Canopy paradigm (augmented by transfer coalescing techniques) have been making effective use of the 50 Gflop ACPMAPS system at Fermilab for heavy-quark physics. These investigations have uncovered neccessities and limitations beyond the usual CPU-Memory-Communications triad. Mass storage bandwidth and system robustness requirements are discussed in light of this experience. C1 FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. NR 9 TC 1 Z9 1 U1 2 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD APR PY 1994 SU 34 BP 823 EP 825 DI 10.1016/0920-5632(94)90525-8 PG 3 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500211 ER PT J AU DRAPER, T GOTTLIEB, S SONI, A TOUSSAINT, D AF DRAPER, T GOTTLIEB, S SONI, A TOUSSAINT, D TI LATTICE 93 - PROCEEDINGS OF THE INTERNATIONAL-SYMPOSIUM ON LATTICE FIELD-THEORY, DALLAS, TEXAS, USA, 12-16 OCTOBER 1993 - PREFACE SO NUCLEAR PHYSICS B LA English DT Editorial Material C1 UNIV KENTUCKY,DEPT PHYS & ASTRON,LEXINGTON,KY 40506. INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47401. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. UNIV ARIZONA,DEPT PHYS,TUCSON,AZ 85721. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD APR PY 1994 SU 34 BP R5 EP R5 PG 1 WC Physics, Particles & Fields SC Physics GA NJ625 UT WOS:A1994NJ62500001 ER PT J AU SHIEH, ASL KRISHNAMURTHY, R RANSOM, VH AF SHIEH, ASL KRISHNAMURTHY, R RANSOM, VH TI STABILITY, ACCURACY, AND CONVERGENCE OF THE NUMERICAL-METHODS IN RELAP5/MOD3 SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID 2-PHASE FLOW; MODELS AB Both theoretical and numerical results on the relationships between the magnitude of the interphase drag coefficients, the mesh size, and the stability of the semi-implicit method used in RELAP5 are presented. It is shown that the numerical solutions are both stable and convergent on meshes with a characteristic ratio (ratio of mesh size-to-hydraulic diameter) that is not too small, that the code is capable of simulating physical instabilities on coarse meshes, and that unphysical instabilities will occur only at small mesh size even for problems that admit physical instabilities. Good transition from pre-critical heat flux (CHF) to post-CHF, however, is necessary to improve the accuracy of certain calculations. C1 PACIFIC NUCL,WESTMONT,IL 60559. PURDUE UNIV,DEPT NUCL ENGN,W LAFAYETTE,IN 47907. RP SHIEH, ASL (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 8 TC 15 Z9 15 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD APR PY 1994 VL 116 IS 4 BP 227 EP 244 PG 18 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NE261 UT WOS:A1994NE26100001 ER PT J AU HENDRICKS, JS BROCKHOFF, RC AF HENDRICKS, JS BROCKHOFF, RC TI COMPARISON OF SCIENTIFIC COMPUTING PLATFORMS FOR MCNP4A MONTE-CARLO CALCULATIONS SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article AB The performance of seven computer platforms is evaluated with the widely used and internationally available MCNP4A Monte Carlo radiation transport code. All results are reproducible and are presented in such a way as to enable comparison with computer platforms not in the study. We observe that the HP/9000-735 workstation runs MCNP 50% faster than the Cray YMP 8/64. Compared with the Cray YMP 8/64, the IBM RS/6000-560 is 68% as fast, the Sun Sparc 10 is 66% as fast, the Silicon Graphics ONYX is 90% as fast, the Gateway 2000 model 4DX2-66V personal computer is 27% as fast, and the Sun Sparc2 is 24% as fast. In addition to comparing the timing performance of the seven platforms, we observe that changes in compilers and software over the past 2 yr have resulted in only modest performance improvements, hardware improvements have enhanced performance by less than a factor of approximately 3, timing studies are very problem dependent, MCNP4A runs about as fast as MCNP4. RP HENDRICKS, JS (reprint author), LOS ALAMOS NATL LAB,DIV APPL THEORET PHYS,LOS ALAMOS,NM 87545, USA. NR 11 TC 3 Z9 3 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD APR PY 1994 VL 116 IS 4 BP 269 EP 277 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NE261 UT WOS:A1994NE26100003 ER PT J AU FLETCHER, CD GHAN, LS DETERMAN, JC NIELSEN, HH AF FLETCHER, CD GHAN, LS DETERMAN, JC NIELSEN, HH TI CONCEPTUAL DESIGN STATION BLACKOUT AND LOSS-OF-FLOW ACCIDENT ANALYSIS FOR THE ADVANCED NEUTRON SOURCE REACTOR SO NUCLEAR TECHNOLOGY LA English DT Article DE ADVANCED NEUTRON SOURCE; STATION BLACKOUT; CONCEPTUAL SAFETY ANALYSIS AB A system model of the Advanced Neutron Source Reactor (ANSR) has been developed and used to perform conceptual safety analyses. To better represent thermal-hydraulic behavior in the unique geometry and conditions of the ANSR core, three specific changes in the RELAP5/MOD3 computer code were implemented: a turbulent forced-convection heat transfer correlation, a critical heat flux correlation, and an interfacial drag correlation. The system model includes representations of the ANSR core, heat exchanger coolant loops, and the pressurizing and letdown systems. Analyses of ANSR station blackout and loss-of-flow accident scenarios are described. The results show that the core can survive without exceeding the flow excursion or critical heat flux thermal limits defined for the conceptual safety analysis, if the proper mitigation options are provided. RP FLETCHER, CD (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 20 TC 3 Z9 3 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD APR PY 1994 VL 106 IS 1 BP 31 EP 45 PG 15 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NB248 UT WOS:A1994NB24800003 ER PT J AU VO, TV EDWARDS, DR AF VO, TV EDWARDS, DR TI DEVELOPMENT OF IN-SERVICE INSPECTION PRIORITIES FOR PRESSURIZED-WATER REACTOR HIGH-PRESSURE INJECTION SYSTEM COMPONENTS SO NUCLEAR TECHNOLOGY LA English DT Article DE INSPECTION; PRIORITIES; RISK AB The multiyear program entitled Nondestructive Evaluation Reliability for In-Service Inspection of Light Water Reactors, sponsored by the U. S. Nuclear Regulatory Commission, is being conducted at the Pacific North west Laboratory. The goals of the program are to determine the reliability of current in-service inspection of pressure boundary systems and components and to develop recommendations that can ensure a suitably high inspection reliability. The long-term objective is to develop recommendations for improved in-service inspections. In meeting program objectives, a risk-based method has been developed to guide the development of inspection plans. The method uses results of probabilistic risk assessment and failure modes and effects analysis techniques to identify and prioritize the most risk-important systems and components for inspection at nuclear power plants. The Surry Nuclear Power Station Unit 1 was selected for demonstrating the methodology. The specific system addressed in this study was the high-pressure injection/recirculation (HPI/R) system. The results provide a risk-based ranking of components within the HPI/R system, which can be used to guide the development of improved inspection plans for nuclear power plants. This work will subsequently be used in supporting the revisions of the American Society of Mechanical Engineers' codes and standards. C1 UNIV MISSOURI, DEPT NUCL ENGN, ROLLA, MO 65401 USA. RP VO, TV (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 17 TC 1 Z9 1 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD APR PY 1994 VL 106 IS 1 BP 110 EP 124 PG 15 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NB248 UT WOS:A1994NB24800008 ER PT J AU BURRELL, AK BRYAN, JC KUBAS, GJ AF BURRELL, AK BRYAN, JC KUBAS, GJ TI TECHNETIUM CARBON MULTIPLE BONDS - SYNTHESIS AND STRUCTURE OF TC(=C=CHPH)CL(DPPE)2 AND [TC(EQUIVALENT-TO-C-CH2-T-BU)CL(DPPE)2]+ SO ORGANOMETALLICS LA English DT Note ID METAL-CARBON; TRIPLE BONDS; ORGANOMETALLIC CHEMISTRY; ALKYLIDYNE COMPLEXES; ALKOXIDE LIGANDS; VINYLIDENE; MOLYBDENUM; ALKYNES; CARBENE AB The 16-electron complex TcCl(dppe)2 reacts with terminal alkynes to form neutral vinylidene complexes of the type Tc(=C=CHR)Cl(dppe)2 (R = Ph, Me, t-Bu). Treatment of these vinylidene complexes with acid (HBF4 for R = Ph, HNMe3BPh4 for R = t-Bu) yields the respective terminal carbyne complexes Tc(=CCH2R)Cl(dppe)2+ (R = Ph, t-Bu). These vinylidene and carbyne compounds represent the first examples of technetium carbenes or carbynes. X-ray structures of Tc(=C= CHPh)Cl(dppe)2 and Tc(=CCH2-t-Bu)Cl(dppe)2+ were determined, and the Tc-C bond lengths obtained were 1.861(9) and 1.724(7) angstrom, respectively. RP LOS ALAMOS NATL LAB, INORGAN & STRUCT CHEM GRP CST3, LOS ALAMOS, NM 87545 USA. NR 31 TC 11 Z9 11 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0276-7333 EI 1520-6041 J9 ORGANOMETALLICS JI Organometallics PD APR PY 1994 VL 13 IS 4 BP 1067 EP 1069 DI 10.1021/om00016a007 PG 3 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA NF606 UT WOS:A1994NF60600007 ER PT J AU BALLA, J BAKAC, A ESPENSON, JH AF BALLA, J BAKAC, A ESPENSON, JH TI CATALYSIS TO THE DISFAVORED PRODUCT - THE CASE OF (ETA(5)-C5H5)MO(CO)3-CENTER-DOT SO ORGANOMETALLICS LA English DT Note ID ELECTRON-TRANSFER REACTIONS; METAL-METAL BOND; FLASH-PHOTOLYSIS; PHOTOCHEMISTRY; 17-ELECTRON; COMPLEXES; MECHANISM; RADICALS; KINETICS AB The title compound is a 17e organometallic radical, which ordinarily recombines to the dimer in many solvents, including acetonitrile. In the presence of 1,4-(Me2N)2C6H4 (TMPD), however, the radical disproportionates to (eta5-C5H5)Mo(CO)3- and (eta5-C5H5)Mo(CO)3- NCCH3+. The mechanism involves the radical oxidizing TMPD and reducing TMPD.+, whose buildup and decay were directly monitored. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP BAKAC, A (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 11 TC 5 Z9 5 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD APR PY 1994 VL 13 IS 4 BP 1073 EP 1074 DI 10.1021/om00016a009 PG 2 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA NF606 UT WOS:A1994NF60600009 ER PT J AU HEMPEL, R HEY, AJG MCBRYAN, O WALKER, DW AF HEMPEL, R HEY, AJG MCBRYAN, O WALKER, DW TI MESSAGE-PASSING INTERFACES - SPECIAL ISSUE SO PARALLEL COMPUTING LA English DT Editorial Material C1 UNIV COLORADO,DEPT COMP SCI,BOULDER,CO 80309. OAK RIDGE NATL LAB,MATH SCI SECT,OAK RIDGE,TN 37831. RP HEMPEL, R (reprint author), GERMAN NATL RES CTR COMP SCI,POSTFACH 1316,D-53731 ST AUGUSTIN,GERMANY. RI Walker, David/B-7978-2010 NR 0 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8191 J9 PARALLEL COMPUT JI Parallel Comput. PD APR PY 1994 VL 20 IS 4 BP 415 EP 416 DI 10.1016/0167-8191(94)90020-5 PG 2 WC Computer Science, Theory & Methods SC Computer Science GA NF329 UT WOS:A1994NF32900001 ER PT J AU SUNDERAM, VS GEIST, GA DONGARRA, J MANCHEK, R AF SUNDERAM, VS GEIST, GA DONGARRA, J MANCHEK, R TI THE PVM CONCURRENT COMPUTING SYSTEM - EVOLUTION, EXPERIENCES, AND TRENDS SO PARALLEL COMPUTING LA English DT Article DE MESSAGE PASSING; PVM SYSTEM; NETWORKED COMPUTING PLATFORMS; PERFORMANCE; CASE STUDIES AB The PVM system, a software framework for heterogeneous concurrent computing in networked environments, has evolved in the past several years into a viable technology for distributed and parallel processing in a variety of disciplines. PVM supports a straightforward but functionally complete message passing model, and is capable of harnessing the combined resources of typically heterogeneous networked computing platforms to deliver high levels of performance and functionality. In this paper, we describe the architecture of PVM system, and discuss its computing model, the programming interface it supports, auxiliary facilities for process groups and MPP support, and some of the internal implementation techniques employed. Performance issues, dealing primarily with communication overheads, are analyzed, and recent findings as well as experimental enhancements are presented. In order to demonstrate the viability of PVM for large scale scientific supercomputing, the paper includes representative case studies in materials science, environmental science, and climate modeling. We conclude with a discussion of related projects and future directions, and comment on near and long-term potential for network computing with the PVM system. C1 OAK RIDGE NATL LAB,MATH SCI SECT,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT COMP SCI,KNOXVILLE,TN 37996. RP SUNDERAM, VS (reprint author), EMORY UNIV,DEPT MATH & COMP SCI,ATLANTA,GA 30322, USA. RI Dongarra, Jack/E-3987-2014 NR 17 TC 104 Z9 108 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8191 J9 PARALLEL COMPUT JI Parallel Comput. PD APR PY 1994 VL 20 IS 4 BP 531 EP 545 DI 10.1016/0167-8191(94)90027-2 PG 15 WC Computer Science, Theory & Methods SC Computer Science GA NF329 UT WOS:A1994NF32900008 ER PT J AU BUTLER, RM LUSK, EL AF BUTLER, RM LUSK, EL TI MONITORS, MESSAGES, AND CLUSTERS - THE P4 PARALLEL PROGRAMMING SYSTEM SO PARALLEL COMPUTING LA English DT Article DE MESSAGE PASSING; PORTABILITY; P4; PERFORMANCE; P4 SYSTEM ARCHITECTURE; APPLICATIONS AB p4 is a portable library of C and Fortran subroutines for programming parallel computers. It is the current version of a system that has been in use since 1984. It includes features for explicit parallel programming of shared-memory machines, distributed-memory machines (including heterogeneous networks of workstations), and clusters, by which we mean shared-memory multiprocessors communicating via message passing. We discuss here the design goals, history, and system architecture of p4 and describe briefly a diverse collection of applications that have demonstrated the utility of p4. C1 ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439. UNIV N FLORIDA,COLL COMP SCI & ENGN,JACKSONVILLE,FL 32224. NR 27 TC 59 Z9 60 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8191 J9 PARALLEL COMPUT JI Parallel Comput. PD APR PY 1994 VL 20 IS 4 BP 547 EP 564 DI 10.1016/0167-8191(94)90028-0 PG 18 WC Computer Science, Theory & Methods SC Computer Science GA NF329 UT WOS:A1994NF32900009 ER PT J AU SKJELLUM, A SMITH, SG DOSS, NE LEUNG, AP MORARI, M AF SKJELLUM, A SMITH, SG DOSS, NE LEUNG, AP MORARI, M TI THE DESIGN AND EVOLUTION OF ZIPCODE SO PARALLEL COMPUTING LA English DT Article DE STATIC PROCESS GROUPS; CONTEXTS; VIRTUAL TOPOLOGIES; POINT-TO-POINT COMMUNICATION; COLLECTIVE COMMUNICATION; DATA TYPES; PARALLEL LIBRARIES; LARGE-SCALE SOFTWARE; PORTABILITY; ZIPCODE; MPI AB Zipcode is a message-passing and process-management system that was designed for multicomputers and homogeneous networks of computers in order to support libraries and large-scale multicomputer software. The system has evolved significantly over the last five years, based on our experiences and identified needs. Features of Zipcode that were originally unique to it, were its simultaneous support of static process groups, communication contexts, and virtual topologies, forming the 'mailer' data structure. Point-to-point and collective operations reference the underlying group, and use contexts to avoid mixing up messages. Recently, we have added'gather-send' and 'receive-scatter' semantics, based on persistent Zipcode 'invoices', both as a means to simplify message passing, and as a means to reveal more potential runtime optimizations. Key features in Zipcode appear in the forthcoming MPI standard. C1 MISSISSIPPI STATE UNIV,NSF ENGN RES CTR COMP FIELD SIMULAT,MISSISSIPPI STATE,MS 39762. LAWRENCE LIVERMORE NATL LAB,NUMER MATH GRP,LIVERMORE,CA 94550. SYRACUSE UNIV,CTR NW PARALLEL ARCHITECTURES,SYRACUSE,NY. CALTECH,PASADENA,CA 91125. RP SKJELLUM, A (reprint author), MISSISSIPPI STATE UNIV,DEPT COMP SCI,MISSISSIPPI STATE,MS 39762, USA. NR 41 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8191 J9 PARALLEL COMPUT JI Parallel Comput. PD APR PY 1994 VL 20 IS 4 BP 565 EP 596 DI 10.1016/0167-8191(94)90029-9 PG 32 WC Computer Science, Theory & Methods SC Computer Science GA NF329 UT WOS:A1994NF32900010 ER PT J AU WALKER, DW AF WALKER, DW TI THE DESIGN OF A STANDARD MESSAGE-PASSING INTERFACE FOR DISTRIBUTED-MEMORY CONCURRENT COMPUTERS SO PARALLEL COMPUTING LA English DT Article DE MESSAGE PASSING; DISTRIBUTED MEMORY COMPUTERS; STANDARDS; POINT-TO-POINT COMMUNICATION; COLLECTIVE COMMUNICATION; PROCESS GROUPS; COMMUNICATION CONTEXTS; APPLICATION TOPOLOGIES AB This paper presents an overview of MPI, a proposed standard message passing interface for MIMD distributed memory concurrent computers. The design of MPI has been a collective effort involving researchers in the United States and Europe from many organizations and institutions. MPI includes point-to-point and collective communication routines, as well as support for process groups, communication contexts, and application topologies. While making use of new ideas where appropriate, the MPI standard is based largely on current practice. RP WALKER, DW (reprint author), OAK RIDGE NATL LAB,MATH SCI SECT,POB 2008,BLDG 6012,OAK RIDGE,TN 37831, USA. RI Walker, David/B-7978-2010; OI Walker, David/0000-0002-1360-6330 NR 16 TC 48 Z9 48 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8191 J9 PARALLEL COMPUT JI Parallel Comput. PD APR PY 1994 VL 20 IS 4 BP 657 EP 673 DI 10.1016/0167-8191(94)90033-7 PG 17 WC Computer Science, Theory & Methods SC Computer Science GA NF329 UT WOS:A1994NF32900014 ER PT J AU GAYLORD, M SMITH, Z LORCH, V BLANK, M SNYDER, F AF GAYLORD, M SMITH, Z LORCH, V BLANK, M SNYDER, F TI ELEVATED PLATELET-ACTIVATING-FACTOR LEVELS IN THE 1ST WEEK OF LIFE ARE ASSOCIATED WITH THE SEVERITY OF BRONCHOPULMONARY DYSPLASIA IN VERY-LOW-BIRTH-WEIGHT INFANTS SO PEDIATRIC RESEARCH LA English DT Meeting Abstract C1 UNIV TENNESSEE,GRAD SCH MED,KNOXVILLE,TN 37996. OAK RIDGE ASSOCIATED UNIV,OAK RIDGE,TN 37830. NR 3 TC 1 Z9 1 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0031-3998 J9 PEDIATR RES JI Pediatr. Res. PD APR PY 1994 VL 35 IS 4 BP A333 EP A333 PN 2 PG 1 WC Pediatrics SC Pediatrics GA NG779 UT WOS:A1994NG77901977 ER PT J AU MCCURLEY, RS CAMERON, HS SZCZEPANIAK, D RECINOS, A KRAUSS, R EVANS, G WEISSMAN, B WESTON, BW AF MCCURLEY, RS CAMERON, HS SZCZEPANIAK, D RECINOS, A KRAUSS, R EVANS, G WEISSMAN, B WESTON, BW TI PHYSICAL MAPS OF THE HUMAN ALPHA(1,3)FUCOSYLTRANSFERASE LOCI SO PEDIATRIC RESEARCH LA English DT Meeting Abstract C1 UNIV N CAROLINA,DEPT PEDIAT,CHAPEL HILL,NC 27514. UNIV N CAROLINA,LINEBERGER COMP CANC CTR,CHAPEL HILL,NC 27514. SALK INST BIOL STUDIES,LA JOLLA,CA 92037. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0031-3998 J9 PEDIATR RES JI Pediatr. Res. PD APR PY 1994 VL 35 IS 4 BP A165 EP A165 PN 2 PG 1 WC Pediatrics SC Pediatrics GA NG779 UT WOS:A1994NG77900977 ER PT J AU POOLE, WJ EMBURY, JD MACEWEN, S KOCKS, UF AF POOLE, WJ EMBURY, JD MACEWEN, S KOCKS, UF TI LARGE-STRAIN DEFORMATION OF A COPPER TUNGSTEN COMPOSITE SYSTEM .1. STRAIN DISTRIBUTIONS SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID METAL-MATRIX COMPOSITES AB The deformation behaviour of copper-tungsten fibre model composites was examined using plane-strain compression tests with the tungsten fibres parallel to the direction of zero strain (i.e. perpendicular to the loading axis). Experiments were conducted on 20 and 30% volume fraction samples with triangular and square arrangements of fibres. The local distribution of strain in the matrix of the composite was experimentally determined by the change in shape of a fiducial grid fabricated on the sample prior to deformation. In conjunction with the experimental work, finite-element method (FEM) calculations were performed for similar samples and loading conditions. Very good agreement was observed between the experimental and calculated macroscopic stress-strain behaviour and the local distribution of strain. In addition, the distribution of local stress in the composite was obtained from the FEM calculations. C1 ALCAN INT LTD,KINGSTON RES & DEV CTR,KINGSTON K7L 5L9,ON,CANADA. LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP POOLE, WJ (reprint author), MCMASTER UNIV,DEPT MAT SCI & ENGN,HAMILTON L8S 4L7,ONTARIO,CANADA. RI Kocks, Fred/E-1159-2011 NR 15 TC 18 Z9 18 U1 0 U2 2 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD APR PY 1994 VL 69 IS 4 BP 645 EP 665 PG 21 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA NE634 UT WOS:A1994NE63400001 ER PT J AU POOLE, WJ EMBURY, JD MACEWEN, S KOCKS, UF AF POOLE, WJ EMBURY, JD MACEWEN, S KOCKS, UF TI LARGE-STRAIN DEFORMATION OF A COPPER TUNGSTEN COMPOSITE SYSTEM .2. APPLICATIONS SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID METAL-MATRIX COMPOSITES; PLASTICITY; FRACTURE AB A model composite system comprised of tungsten fibres in a polycrystalline copper matrix has been used to examine the processes which control (i) matrix texture development, (ii) recrystallization behaviour in the matrix and (iii) the damage accumulation process. The composite was deformed in plane strain compression with the fibres parallel to the direction of zero strain (i.e. perpendicular to the loading axis). Experimental measurements were made of local and global texture development as well as metallographic observations of the pattern of recrystallization events and metallographic observations of damage events in the tungsten fibres or at the copper-tungsten interface. Physically based explanations are used to describe the results in terms of the local flow pattern in the matrix and the local distribution of stresses. C1 LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. ALCAN INT LTD,KINGSTON RES & DEV CTR,KINGSTON K7L 5L9,ON,CANADA. RP POOLE, WJ (reprint author), MCMASTER UNIV,DEPT MAT SCI & ENGN,HAMILTON L8S 4L7,ONTARIO,CANADA. RI Kocks, Fred/E-1159-2011 NR 30 TC 10 Z9 11 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD APR PY 1994 VL 69 IS 4 BP 667 EP 687 PG 21 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA NE634 UT WOS:A1994NE63400002 ER PT J AU ZHU, YM AF ZHU, YM TI STUDIES OF THE CRYSTALLOGRAPHY OF ARBITRARY GRAIN-BOUNDARIES BY O-LATTICE CONSTRUCTION - APPLICATION TO BULK YBA2CU3O7-DELTA SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID STAINLESS-STEEL AB We report our procedure for analysing the crystallography of arbitrary grain boundaries (arbitrary relative orientation with an arbitrary path of the interface between adjacent crystals). The approach is based on constructions of the O-lattice and b-net to derive the possible Burgers vector of arrays of grain-boundary dislocations for any given geometry of the grain boundary (boundary misorientation and boundary plane normal) using Bollmann's O-lattice theory. The configurations of the boundary dislocations associated with these Burgers vectors are then refined by taking the dislocation reaction into account, and comparing them with the experimentally determined Burgers vectors, line directions and line spacings of the dislocations using a modified Frank dislocation model. We applied our procedure to analyse the grain boundary in orthorhombic YBa2Cu3O7-delta superconducting oxides. Our results suggest that the methodology is valuable in determining the structure of arbitrary grain boundaries and is valid even in low-symmetry crystals. RP ZHU, YM (reprint author), BROOKHAVEN NATL LAB,DIV MAT SCI,UPTON,NY 11973, USA. NR 21 TC 15 Z9 15 U1 0 U2 4 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD APR PY 1994 VL 69 IS 4 BP 717 EP 728 PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA NE634 UT WOS:A1994NE63400005 ER PT J AU MORRIS, JR YE, YY HO, KM CHAN, CT YOO, MH AF MORRIS, JR YE, YY HO, KM CHAN, CT YOO, MH TI A 1ST-PRINCIPLES STUDY OF COMPRESSION TWINS IN HCP ZIRCONIUM SO PHILOSOPHICAL MAGAZINE LETTERS LA English DT Article ID COMPUTER-SIMULATION; TWINNING DISLOCATIONS; TRANSITION-METALS; DEFORMATION; BOUNDARIES; CRYSTALS; HYDROGEN; TITANIUM AB Using fully self-consistent ab-initio techniques, we have determined values for {1122BAR} and {1011BAR} compression twin-boundary energies in h.c.p. zirconisum. Experimentally, c-axis compression produces {1122BAR} twins at temperatures below about 800 K; it has been suggested that this is due to the low energy of this type of twin. We find that the {1011BAR} boundary has a much lower energy than the {1122BAR} boundary, by a actor of four. Thus the ease of {1122BAR} formation at low temperatures must be due to the other causes, such as a low barrier to twin nucleation. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP MORRIS, JR (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,DEPT PHYS & ASTRON,AMES,IA 50011, USA. RI Morris, J/I-4452-2012 OI Morris, J/0000-0002-8464-9047 NR 26 TC 10 Z9 10 U1 5 U2 8 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 APR PY 1994 VL 69 IS 4 BP 189 EP 195 DI 10.1080/09500839408241591 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA NE531 UT WOS:A1994NE53100004 ER PT J AU GUPTA, V AF GUPTA, V TI REMOTE-SENSING AND PHOTOGRAMMETRY IN TREATY VERIFICATION - PRESENT CHALLENGES AND PROSPECTS FOR THE FUTURE SO PHOTOGRAMMETRIC RECORD LA English DT Article AB Treaty verification involves the acquisition and interpretation of data to establish a country's compliance to an agreement. Remote sensing and photogrammetry in verification is established in the intelligence community and is progressively entering the civilian sector as well. The Open Skies Treaty and the proliferation of commercial satellite imagery have created a niche for open, multilateral verification. These recent developments come at an opportune moment as the verification task has become more cumbersome and complex. This paper surveys the changes in the field of verification, aerial monitoring and satellite surveillance. It details existing and future verification tasks and presents the operational capabilities for fulfilling those tasks. The limiting factors are also presented. RP GUPTA, V (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR SECUR & TECHNOL STUDIES,LIVERMORE,CA 94550, USA. NR 0 TC 2 Z9 2 U1 1 U2 1 PU PHOTOGRAMMETRIC SOC, UNIV COLL LONDON PI LONDON PA DEPT PHOTOGRAMMETRIC SURVEY, GOWER ST, LONDON, ENGLAND WC1E 6BT SN 0031-868X J9 PHOTOGRAMM REC JI Photogramm. Rec. PD APR PY 1994 VL 14 IS 83 BP 729 EP 745 DI 10.1111/j.1477-9730.1994.tb00787.x PG 17 WC Geography, Physical; Geosciences, Multidisciplinary; Remote Sensing; Imaging Science & Photographic Technology SC Physical Geography; Geology; Remote Sensing; Imaging Science & Photographic Technology GA NE920 UT WOS:A1994NE92000002 ER PT J AU ANDREWS, AB BLYTH, RIR ARKO, AJ JOYCE, JJ FISK, Z THOMPSON, JD BARTLETT, RJ CANFIELD, PC OLSON, CG BENNING, P RISEBOROUGH, PS AF ANDREWS, AB BLYTH, RIR ARKO, AJ JOYCE, JJ FISK, Z THOMPSON, JD BARTLETT, RJ CANFIELD, PC OLSON, CG BENNING, P RISEBOROUGH, PS TI TEMPERATURE-DEPENDENCE OF 4F PES FEATURES AND HOLE OCCUPANCY IN YTTERBIUM HEAVY FERMIONS SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID MODEL AB We have measured the temperature dependence between 80 and 300 K and spectral weight of the 4f features in clean single crystal Yb heavy fermions, cleaved in a vacuum of 5 x 10(-11) Torr. A small (approximately 15%) decrease in spectral weight differs substantially from the reported approximately 50% decrease over this range. All divalent features are much larger than expected, yielding nf values far too small. The intensity of the divalent features in YbAuCu4 is about two orders of magnitude larger than expected. C1 IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. POLYTECH INST NEW YORK,BROOKLYN,NY. RP ANDREWS, AB (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Riseborough, Peter/D-4689-2011; Canfield, Paul/H-2698-2014 NR 8 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 15 EP 17 DI 10.1016/0921-4526(94)91721-3 PG 3 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800006 ER PT J AU MIGLIORI, A SARRAO, JL MANDRUS, D FISK, Z BALATSKY, A TRUGMAN, SA THOMPSON, JD MAPLE, MB AF MIGLIORI, A SARRAO, JL MANDRUS, D FISK, Z BALATSKY, A TRUGMAN, SA THOMPSON, JD MAPLE, MB TI ULTRASOUND STUDIES OF U2ZN17 AND UCU5 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID HEAVY-ELECTRON SYSTEM; STATE AB We present here resonant ultrasound spectroscopy measurements of the elastic moduli and attenuation for U2Zn17, and UCu5 through the respective T(N)'s of 9.7 and 15 K. For single-crystal U2Zn17, the data are the first modulus measurements for this material, and exhibit a very large softening of the sound velocity and an anomalous increase in attenuation below T(N), while no precursors at all are observed above. Polycrystalline UCu5, in contrast, exhibits weak softening above T(N), and a weak stiffening below. C1 UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. RP MIGLIORI, A (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Mandrus, David/H-3090-2014 NR 5 TC 2 Z9 2 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 36 EP 38 DI 10.1016/0921-4526(94)91729-9 PG 3 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800014 ER PT J AU GAULIN, BD ISAACS, ED LUSSIER, JG REIMERS, JN GIBBS, D ZSCHACK, P SCHRODER, A TAILLEFER, L GARRETT, JD AF GAULIN, BD ISAACS, ED LUSSIER, JG REIMERS, JN GIBBS, D ZSCHACK, P SCHRODER, A TAILLEFER, L GARRETT, JD TI RESONANT MAGNETIC-X-RAY SCATTERING STUDIES OF HEAVY-FERMION SUPERCONDUCTORS SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID EXCHANGE SCATTERING; PHASE-DIAGRAM; URU2SI2; POLARIZATION; HOLMIUM; UPD2AL3; UPT3 AB The uranium-based heavy fermion superconductors which are known to display weak antiferromagnetism at low temperatures are well suited to study by the newly developed resonant magnetic X-ray scattering technique. We review recent synchrotron X-ray scattering studies of the magnetic behavior of UPd2Al3 and URu2Si2 and the interaction between magnetism and superconductivity in these materials. These measurements show resolution-limited magnetic Bragg peaks in UPd2Al3 in Contrast to those in URu2Si2. The order parameter as measured at the (0 0 1/2) magnetic reciprocal lattice position in UPd2Al3 is different from that at (0, 0, 3/2), the latter of which indicates a strong anomaly at T(N1) approximately 11.8 K below the sharp onset of the antiferromagnetic phase at T(N) approximately 14.5 K. Finally, the behavior of the (0 0 1/2) order parameter is smooth for T less-than-or-equal-to T(C) = 2.00 +/- 0.04 K. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. BROOKHAVEN NATL LAB,OAK RIDGE INST SCI & EDUC,UPTON,NY 11973. CNRS,LAB LOUIS NEEL,F-38042 GRENOBLE,FRANCE. RP GAULIN, BD (reprint author), MCMASTER UNIV,DEPT PHYS & ASTRON,HAMILTON L8S 4M1,ONTARIO,CANADA. RI Piper, Walter/B-7908-2009 NR 21 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 57 EP 62 DI 10.1016/0921-4526(94)91737-X PG 6 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800022 ER PT J AU MOVSHOVICH, R LACERDA, A CANFIELD, PC ARMS, D THOMPSON, JD FISK, Z AF MOVSHOVICH, R LACERDA, A CANFIELD, PC ARMS, D THOMPSON, JD FISK, Z TI INVESTIGATIONS OF THE NATURE OF THE 0.4 K PHASE-TRANSITION IN YBBIPT SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO AB We report results of resistivity measurements at ambient and hydrostatic pressures of up to almost-equal-to 6 kbar. Large resistivity anisotropy sets in below the phase-transition temperature of 0.4 K. In some directions the resistivity increases below 0.4 K, which we interpret as partial gapping of the Fermi surface. Hydrostatic pressure of less than 1 kbar suppresses the low-temperature phase entirely. C1 UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. RP MOVSHOVICH, R (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Canfield, Paul/H-2698-2014 NR 9 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 67 EP 69 DI 10.1016/0921-4526(94)91739-6 PG 3 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800024 ER PT J AU HEFFNER, RH AMATO, A CANFIELD, PC FEYERHERM, R FISK, Z GYGAX, FN MACLAUGHLIN, DE SCHENCK, A THOMPSON, JD OTT, HR AF HEFFNER, RH AMATO, A CANFIELD, PC FEYERHERM, R FISK, Z GYGAX, FN MACLAUGHLIN, DE SCHENCK, A THOMPSON, JD OTT, HR TI MAGNETIC-ORDERING IN YBBIPT SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO AB The field dependence of the muSR relaxation function in YbBiPt, together with an anisotropic resistive anomaly recently discovered by Movshovich et al., indicate that both the Yb ions and the conduction electrons undergo magnetic ordering. New evidence is also presented for a change in Yb spin-ordering or spin-dynamics below about 0.1 K. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. ETH ZURICH,INST INTERMEDIATE ENERGY PHYS,5232 VILLIGEN PSI,SWITZERLAND. UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521. RP HEFFNER, RH (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Feyerherm, Ralf/F-5487-2013; Canfield, Paul/H-2698-2014; Amato, Alex/H-7674-2013 OI Feyerherm, Ralf/0000-0003-3034-4210; Amato, Alex/0000-0001-9963-7498 NR 9 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 113 EP 115 DI 10.1016/0921-4526(94)91752-3 PG 3 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800037 ER PT J AU BOUKHNY, M BULLOCK, GL SHIVARAM, BS HINKS, DG AF BOUKHNY, M BULLOCK, GL SHIVARAM, BS HINKS, DG TI ULTRASOUND STUDY OF THE SUPERCONDUCTING PHASES OF UPT3 UNDER UNIAXIAL-STRESS SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID UNCONVENTIONAL SUPERCONDUCTIVITY; DIAGRAM AB We have studied for the first time experimentally the phase-diagram of UPt3 under a simultaneous application of both uniaxial stress and magnetic field parallel to the c-axis. We find that while the splitting between the two transition temperatures observed in zero field decreases with increasing pressure the splitting in a field observed at low temperatures increases with applied stress. This new result appears to contradict the predictions of several widely discussed theoretical models proposed to explain the phase diagram Of UPt3. C1 UNIV VIRGINIA,DEPT PHYS,CHARLOTTESVILLE,VA 22901. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. NR 13 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 132 EP 134 DI 10.1016/0921-4526(94)91758-2 PG 3 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800043 ER PT J AU LUSSIER, JG SCHRODER, A GAULIN, BD GARRETT, JD BUYERS, WJL REBELSKY, L SHAPIRO, SM AF LUSSIER, JG SCHRODER, A GAULIN, BD GARRETT, JD BUYERS, WJL REBELSKY, L SHAPIRO, SM TI INCOMMENSURATE MAGNETIC ORDER IN UNI2AL3 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO AB Elastic neutron scattering measurements performed on single crystal UNi2Al3 show this heavy-fermion superconductor to display long-range incommensurate (IC) magnetic order below T(N) = 5.2 K. The ordering wave vector is (1/2 +/- tau, 0, 1/2) with tau = 0.110 +/- 0.003, and the size of the maximum ordered moment is 0.24 +/- 0.10mu(B)/U. C1 MCMASTER UNIV,DEPT PHYS & ASTRON,HAMILTON L8S 4M1,ONTARIO,CANADA. BROOKHAVEN NATL LAB,UPTON,NY 11973. ATOM ENERGY CANADA LTD RES,CHALK RIVER LABS,CHALK RIVER K0J 1J0,ON,CANADA. RI Piper, Walter/B-7908-2009 NR 6 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 137 EP 139 DI 10.1016/0921-4526(94)91760-4 PG 3 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800045 ER PT J AU SIGNORE, PJC MEISEL, MW BROWN, SE FISK, Z AF SIGNORE, PJC MEISEL, MW BROWN, SE FISK, Z TI INDUCTIVE RESPONSE OF POLISHED, SINGLE-CRYSTAL OF UPT3 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID HEAVY FERMION SUPERCONDUCTORS; TEMPERATURE-DEPENDENCE; FIELD PENETRATION; DEPTH AB Our earlier work on the inductive response of single crystals Of UPt3 revealed a difference between the low frequency (31.7-317 Hz) and the radio frequency (RF) (3-16 MHz) temperature dependence of the susceptibility for T/T(c) < 0.5. After carefully polishing the surface of the crystals (defect size less-than-or-equal-to 0.3 mum), RF measurements have been repeated, and the results are dependent on the surface conditions. C1 UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV FLORIDA,CTR ULTRALOW TEMP RES,GAINESVILLE,FL 32611. RP SIGNORE, PJC (reprint author), UNIV FLORIDA,DEPT PHYS,GAINESVILLE,FL 32611, USA. NR 9 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 157 EP 158 DI 10.1016/0921-4526(94)91767-1 PG 2 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800052 ER PT J AU LIN, SW ZHANG, H JIN, C KETTERSON, JB LEE, DM HINKS, DG LEVY, M SARMA, BK AF LIN, SW ZHANG, H JIN, C KETTERSON, JB LEE, DM HINKS, DG LEVY, M SARMA, BK TI ULTRASONIC STUDIES OF SUPERCONDUCTING PHASE-DIAGRAM OF UPT3 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID HEAT AB We present a superconducting phase diagram of UPt3 for a field at 45-degrees to the c-axis constructed from high-resolution ultrasonic velocity measurements. It is unambiguously determined that the H(FL)(T) line intersects the H(c2) (T) line where a kink is observed. The available data favors the interpretation that the H(T(c) line terminates on the H(FL)(T) line at a different point. C1 CORNELL UNIV,ATOM & SOLID STATE PHYS LAB,ITHACA,NY 14853. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208. RP LIN, SW (reprint author), UNIV WISCONSIN,DEPT PHYS,MILWAUKEE,WI 53201, USA. RI Ketterson, John/B-7234-2009 NR 9 TC 1 Z9 1 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 170 EP 172 DI 10.1016/0921-4526(94)91772-8 PG 3 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800057 ER PT J AU DALICHAOUCH, Y MAPLE, MB AF DALICHAOUCH, Y MAPLE, MB TI ALLOYING STUDIES IN U1-XTHXPD2AL3 (0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1) SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID FERMI-LIQUID BEHAVIOR AB Measurements of the temperature and concentration dependence of the magnetic susceptibility and electrical resistivity for U1-xThxPd2Al3 are presented. The magnetic susceptibility data scale with the concentration of U ions over large regions of x and T. The electrical resistivity shows a smooth evolution from the Kondo lattice regime to the single-ion Kondo behavior as Th concentration x is increased. A lack of saturation in resistivity in the samples with x = 0.8 and 0.6, and a logarithmic divergence in chi(T) at low temperatures makes the U1-xThxPd2Al3 system a good candidate for a two-channel Kondo effect. C1 LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. UNIV CALIF SAN DIEGO,INST PURE & APPL PHYS SCI,LA JOLLA,CA 92093. RP DALICHAOUCH, Y (reprint author), UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093, USA. NR 6 TC 23 Z9 23 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 176 EP 177 DI 10.1016/0921-4526(94)91774-4 PG 2 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800059 ER PT J AU STEINER, MM ALOUANI, M ALBERS, RC SHAM, LJ AF STEINER, MM ALOUANI, M ALBERS, RC SHAM, LJ TI THE QUASI-PARTICLE PROPERTIES OF UPT3 AND THE HIGH-T(C) CUPRATES SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID FERMI-SURFACE; TRANSITION-METALS; BAND THEORY AB The dynamic fluctuations due to localized Hubbard type of effective interactions, U and J, are calculated perturbatively up to second order around the local density approximation (LDA) electronic structure. We have found for UX3 (X = Ir, Pt, or Au), the mass-enhancement factors are in good agreement with experiment for U = 2eV, and that the trends in the enhancement factors are systematically related to changes in the underlying LDA electronic structure. As for La2CuO4 we find that the dynamic fluctuations are small despite the large effective interaction. Further, our approach reproduces the insulating ground state and the magnetic moment correctly. For the doped case [La2-xBaxCuO4 (x not-equal 0)] we find that even though the mass enhancement is small, there is a significant broadening of the quasiparticles close to the Fermi energy. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. RP STEINER, MM (reprint author), OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210, USA. RI Alouani, Mebarek/A-9101-2011; OI Alouani, Mebarek/0000-0002-7985-5276; Sham, Lu/0000-0001-5718-2077 NR 21 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 186 EP 190 DI 10.1016/0921-4526(94)91778-7 PG 5 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800063 ER PT J AU HAMMEL, PC REYES, AP AHRENS, ET MACLAUGHLIN, DE THOMPSON, JD FISK, Z CANFIELD, PC CHEONG, SW SCHIRBER, JE AF HAMMEL, PC REYES, AP AHRENS, ET MACLAUGHLIN, DE THOMPSON, JD FISK, Z CANFIELD, PC CHEONG, SW SCHIRBER, JE TI NMR-STUDIES OF OXYGEN-DOPED LA2CUO(4+DELTA) SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID LOCAL-STRUCTURE; SUPERCONDUCTING LA2CUO4+DELTA; DEPENDENT SUPERCONDUCTIVITY; PHASE-SEPARATION; NQR; CU AB The observation that the structure of this material is sensitive to levels of doping sufficient to produce superconductivity (T(c) approximately 40 K) suggests an important role for structure in determining its electronic properties. Here we discuss unusual features of phase separation and studies of cooling rate dependence of the superconducting T(c) relevant to this proposition. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP HAMMEL, PC (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Canfield, Paul/H-2698-2014; Hammel, P Chris/O-4845-2014 OI Hammel, P Chris/0000-0002-4138-4798 NR 22 TC 6 Z9 6 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 235 EP 238 DI 10.1016/0921-4526(94)91795-7 PG 4 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800080 ER PT J AU BILLINGE, SJL KWEI, GH TAKAGI, H AF BILLINGE, SJL KWEI, GH TAKAGI, H TI LOCAL-STRUCTURE AND SUPERCONDUCTIVITY IN LA2-XBAXCUO4 FOR X=0.125 AND X=0.15 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID PHASE; TRANSITION AB Using synchrotron X-ray and pair distribution function analysis of powder neutron diffraction data, we show that the LTT phase of La2-xBaxCuO4 supports superconductivity at high (27 K) T(c)'s. We also show that the structural change at the LTO-LTT transition is different from that of the crystal structure models. The implications are discussed. C1 UNIV TOKYO,DEPT APPL PHYS,TOKYO 113,JAPAN. RP BILLINGE, SJL (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Takagi, Hidenori/B-2935-2010 NR 8 TC 1 Z9 1 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 244 EP 245 DI 10.1016/0921-4526(94)91797-3 PG 2 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800082 ER PT J AU DEANDRADE, MC DALICHAOUCH, Y MAPLE, MB AF DEANDRADE, MC DALICHAOUCH, Y MAPLE, MB TI ANOMALOUS MAGNETORESISTANCE BEHAVIOR OF SUPERCONDUCTING ND2-XCEXCUO4-Y SINGLE-CRYSTAL SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO AB Magnetoresistance measurements on a superconducting Nd2-xCexCuO4-y Single crystal with T(c) almost-equal-to 7 K were made with magnetic fields H applied parallel (H parallel-to c) and perpendicular (H perpendicular-to c) to the tetragonal c-axis. For H parallel-to c, the resistive superconductive transition curves exhibit a double transition at low temperatures and high magnetic fields. This double resistive transition has a maximum near T almost-equal-to 1.1 K, followed by an extremely sharp transition into the superconducting state. For applied fields of 1 kOe, the resistivity first goes to zero, increases again to a finite value and then goes through a second transition. In this region, the resistivity exhibits non-ohmic behavior for low current densities and ohmic behavior for larger measuring currents. The resistivity for H perpendicular-to c does not exhibit any anomalous behavior or a maximum for 0 less-than-or-equal-to H less-than-or-equal-to 60 kOe and 4 K less-than-or-equal-to T less-than-or-equal-to 7 K. C1 UNIV CALIF SAN DIEGO,INST PURE & APPL PHYS SCI,LA JOLLA,CA 92093. LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP DEANDRADE, MC (reprint author), UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093, USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 270 EP 272 DI 10.1016/0921-4526(94)91808-2 PG 3 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800093 ER PT J AU MASON, TE AEPPLI, G HAYDEN, SM RAMIREZ, AP MOOK, HA AF MASON, TE AEPPLI, G HAYDEN, SM RAMIREZ, AP MOOK, HA TI MAGNETIC FLUCTUATIONS IN SUPERCONDUCTING LA(2-X)SR(X)CUO4 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID NEUTRON-SCATTERING; LA1.86SR0.14CUO4; EXCITATIONS AB We present studies of the low-frequency magnetic fluctuations in La2-xSrxCuO4, with particular emphasis on a sample with x = 0.14 and a superconducting T(c) of 35 K. This material exhibits incommensurate peaks in chi''(Q,omega). The magnitude of the incommensuration, delta, increases with doping, x, in the composition range probed. At low temperatures the coherence length associated with the lowest-frequency fluctuations is larger than the mean spacing between impurities. The superconducting transition suppresses, but does not eliminate, the fluctuations with HBARomega less-than-or-equal-to 6 meV. This reduction in chi'' to about 60% of the response present just above T(c) is isotropic, a result incompatible with a clean d-wave gap function. It is, however, consistent with gapless superconductivity induced by localized magnetic impurities. C1 UNIV TORONTO,DEPT PHYS,TORONTO M5S 1A7,ONTARIO,CANADA. AT&T BELL LABS,MURRAY HILL,NJ 07974. UNIV BRISTOL,HH WILLS PHYS LAB,BRISTOL BS8 1TL,AVON,ENGLAND. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP MASON, TE (reprint author), RISO NATL LAB,DK-4000 ROSKILDE,DENMARK. 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 16 TC 17 Z9 17 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 284 EP 287 DI 10.1016/0921-4526(94)91813-9 PG 4 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800098 ER PT J AU BALATSKY, AV ABRAHAMS, E SCALAPINO, DJ SCHRIEFFER, JR AF BALATSKY, AV ABRAHAMS, E SCALAPINO, DJ SCHRIEFFER, JR TI PROPERTIES OF ODD GAP SUPERCONDUCTORS SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID SINGLET SUPERCONDUCTORS AB A new class of superconductors with the gap function odd under time reversal is considered. Some of the physical properties of these superconductors such as the Meissner effect, composite condensate, gapless spectrum and transition from the odd gap superconductor to the BCS state at lower temperatures are discussed. C1 LANDAU INST THEORET PHYS,MOSCOW,RUSSIA. LOS ALAMOS NATL LAB,SERIN PHYS LAB,LOS ALAMOS,NM 87545. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32310. RP BALATSKY, AV (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 7 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 363 EP 365 DI 10.1016/0921-4526(94)91839-2 PG 3 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800124 ER PT J AU RANDERIA, M AF RANDERIA, M TI CROSSOVER BETWEEN BCS AND PREFORMED-BOSON THEORIES WITH INCREASING INTERACTIONS SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID SUPERCONDUCTIVITY; CONDENSATION; GAS AB I review recent work on Fermi systems with attractive interactions of arbitrary strength. First, I describe the results of a functional integral formulation to study the crossover from cooperative Cooper pairing to independent bound state formation and condensation. The inadequacy of a saddle point approximation with increasing coupling is pointed out, and the importance of temporal (quantum) fluctuations for normal state properties at intermediate and strong coupling is emphasized. Next, results from a quantum Monte-Carlo simulation of the two-dimensional (2D) attractive Hubbard model are described. The intermediate coupling normal state is found to deviate markedly from a canonical Fermi liquid: ''spin-gap'' behavior, with 1/T1T approximately chi(T), is found in a degenerate Fermi system. RP RANDERIA, M (reprint author), ARGONNE NATL LAB,DIV MAT SCI 223,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 9 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 373 EP 375 DI 10.1016/0921-4526(94)91841-4 PG 3 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800126 ER PT J AU BRANDOW, BH AF BRANDOW, BH TI A VALENCE-FLUCTUATION THEORY OF CUPRATE SUPERCONDUCTIVITY SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID HIGH-TEMPERATURE SUPERCONDUCTIVITY; HIGH-TC SUPERCONDUCTORS; ANDERSON LATTICE MODEL; BI2SR2CACU2O8+DELTA; MECHANISM; LIFETIME; GAP AB The concepts and formalism of valence-fluctuation theory are applied to an Anderson lattice model of the CuO2 plane. Using a self-consistent variational treatment at the (1/N)1 level, for a finite-U lattice, we find adequate pairing attraction for realistic Hamiltonian parameters. Several unconventional features of the cuprate phenomenology are explained, including the extremely short coherence length, large resistivity, and strong gap anisotropy. RP BRANDOW, BH (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. NR 17 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 376 EP 377 DI 10.1016/0921-4526(94)91842-2 PG 2 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800127 ER PT J AU GAJEWSKI, DA ALLENSPACH, P SEAMAN, CL MAPLE, MB AF GAJEWSKI, DA ALLENSPACH, P SEAMAN, CL MAPLE, MB TI NON-FERMI LIQUID AND SPIN-GLASS BEHAVIOR OF THE SC(1-X)U(X)PD3 SYSTEM SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID Y1-XUXPD3 AB Previous electrical resistivity rho(T), magnetic susceptibility chi(T), and specific heat C(T) measurements on the Y1-xUxPd3 system have revealed Kondo behavior for 0 < x less than or similar to 0.2 and spin-glass-like behavior for 0.3 less than or similar to x less than or similar to 0.5. The Kondo behavior is unusual and characterized by non-Fermi liquid behavior at low temperatures T much less than T(K), where T(K) is the Kondo temperature: rho(T)/rho(0) almost-equal-to 1 - T/(aT(K)) and C(T)/T almost-equal-to - (1/T(K))ln T with evidence for a finite T = 0 residual entropy S(0) = (R/2)ln (2). We report measurements of rho(T), chi(T), and C(T) on the Sc1-xUxPd3 system which reveal similar Kondo, non-Fermi liquid, and spin-glass behaviors. C1 LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. UNIV CALIF SAN DIEGO,INST PURE & APPL PHYS SCI,LA JOLLA,CA 92093. RP GAJEWSKI, DA (reprint author), UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093, USA. NR 8 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 419 EP 422 DI 10.1016/0921-4526(94)91856-2 PG 4 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800141 ER PT J AU CHANDRA, P RAMIREZ, AP COLEMAN, P BRUCK, E MENOVSKY, AA FISK, Z BUCHER, E AF CHANDRA, P RAMIREZ, AP COLEMAN, P BRUCK, E MENOVSKY, AA FISK, Z BUCHER, E TI NONLINEAR SUSCEPTIBILITY MEASUREMENTS IN HEAVY-FERMION SYSTEMS SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID ELECTRON SUPERCONDUCTOR URU2SI2; MAGNETIC ORDER; SPIN-GLASSES; EXCITATIONS; UBE13 AB We discuss the nonlinear susceptibility (chi3) as a probe of higher-order spin correlations in heavy fermion materials, with particular emphasis on U Ru2Si2 and U Be13. The sharp discontinuity of chi3 in U Ru2Si2 is contrasted with two other antiferromagnets U2Zn17 and U0.95Th0.05Pt3 with larger moments. Nonlinear magnetic properties of URu2Si2 can be understood simply in terms of Landau-Ginzberg theory for a large hidden, itinerant order parameter. In UBe13 we discuss how chi3 can be used to probe the presence of quadrupolar fluctuations. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. RUTGERS STATE UNIV,SERIN PHYS LAB,PISCATAWAY,NJ 08854. LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. UNIV CONSTANCE,W-7750 CONSTANCE,GERMANY. UNIV AMSTERDAM,NATUURKUNDIG LAB,1018 XE AMSTERDAM,NETHERLANDS. RP CHANDRA, P (reprint author), NEC RES INST,4 INDEPENDENCE WAY,PRINCETON,NJ 08540, USA. RI Bruck, Ekkes/E-3365-2014 NR 26 TC 8 Z9 8 U1 0 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 426 EP 429 DI 10.1016/0921-4526(94)91858-9 PG 4 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800143 ER PT J AU HUNDLEY, MF THOMPSON, JD CANFIELD, PC FISK, Z AF HUNDLEY, MF THOMPSON, JD CANFIELD, PC FISK, Z TI ELECTRONIC TRANSPORT IN CE3BI4PT3 - EVIDENCE FOR A TEMPERATURE-DEPENDENT HYBRIDIZATION GAP SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO AB We present an analysis of transport data from Ce3Bi4Pt3 to determine the energy gap temperature dependence E(g)(T). E(g)(T) is a decreasing function of temperature. This result is consistent with the gap being a product of many-body correlations in which E(g)(T) is scaled by the Kondo energy scale T(K). RP HUNDLEY, MF (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Canfield, Paul/H-2698-2014 NR 5 TC 26 Z9 26 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 443 EP 444 DI 10.1016/0921-4526(94)91864-3 PG 2 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800149 ER PT J AU DONIACH, S FU, C TRUGMAN, SA AF DONIACH, S FU, C TRUGMAN, SA TI KONDO INSULATORS - ARE SIMPLE THEORIES GOOD ENOUGH SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID GAP FORMATION; CENISN; CE3BI4PT3; LATTICE; STATE AB We briefly summarize the basic concepts behind the terms ''Kondo insulator''. We point out the importance of including band structure effects in calculating excitation spectra. A discussion of a mid-gap impurity band induced by dopants leads to the suggestion of a low-temperature magnetic phase caused by departure from stoichiometry in samples of CeNiSn. This could provide an explanation for the 1/T1 is-proportional-to T3 behavior observed in NMR for this material. C1 STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305. LOS ALAMOS NATL LAB,DIV THEORY,LOS ALAMOS,NM 87545. RP DONIACH, S (reprint author), STANFORD UNIV,DEPT APPL PHYS,STANFORD,CA 94305, USA. NR 18 TC 14 Z9 14 U1 2 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 450 EP 453 DI 10.1016/0921-4526(94)91866-X PG 4 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800151 ER PT J AU WANG, ZQ LI, XP LEE, DH AF WANG, ZQ LI, XP LEE, DH TI KONDO INSULATOR TO ANTIFERROMAGNET TRANSITION IN HEAVY-FERMION COMPOUNDS SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID LATTICE; GAP AB We study the symmetric Kondo lattice model by a variational Monte-Carlo approach in one and two dimensions, While in one dimension a Kondo insulator is always stable, by tuning the Kondo coupling we find a continuous phase transition between a Kondo insulator and an antiferromagnetic state in two dimensions. We compare this result with the recent experimental observations of the Kondo insulator and antiferromagnetic phases in ternary compounds CeNi1-x(Pd, Pt)xSn. C1 BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215. RUTGERS STATE UNIV,SERIN PHYS LAB,PISCATAWAY,NJ 08854. IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598. RP WANG, ZQ (reprint author), LOS ALAMOS NATL LAB,MSK765,LOS ALAMOS,NM 87545, USA. NR 15 TC 20 Z9 20 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 463 EP 465 DI 10.1016/0921-4526(94)91869-4 PG 3 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800154 ER PT J AU LACERDA, A RICKEL, D HUNDLEY, MF CANFIELD, PC THOMPSON, JD FISK, Z HAEN, P LAPIERRE, F AF LACERDA, A RICKEL, D HUNDLEY, MF CANFIELD, PC THOMPSON, JD FISK, Z HAEN, P LAPIERRE, F TI HIGH-FIELD MAGNETORESISTANCE IN SMB6 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO AB We have measured the transverse magnetoresistance (B perpendicular-to I) at T = 4 K of a high quality single crystal of SmB6 in magnetic fields up to 50 T. A relatively large negative transverse magnetoresistance of about 45% at 50 T is observed. The negative transverse magnetoresistance is quadratic in field up to the highest field applied. The effect of high magnetic field on the gap formation of this material will also be discussed. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. CNRS,CRTBT,F-38042 GRENOBLE 9,FRANCE. RP LACERDA, A (reprint author), LOS ALAMOS NATL LAB,NATL HIGH MAGNET FIELD LAB,PULSED FIELD FACIL,LOS ALAMOS,NM 87545, USA. RI Canfield, Paul/H-2698-2014 NR 6 TC 8 Z9 8 U1 3 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 469 EP 470 DI 10.1016/0921-4526(94)91871-6 PG 2 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800156 ER PT J AU MANDRUS, D SARRAO, JL THOMPSON, JD HUNDLEY, MF MIGLIORI, A FISK, Z AF MANDRUS, D SARRAO, JL THOMPSON, JD HUNDLEY, MF MIGLIORI, A FISK, Z TI THERMAL-EXPANSION STUDY OF FE(1-X)CO(X)SI SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO AB We present measurements of the linear expansion coefficient, alpha, on Fe1-xCoxSi from 40 to 300 K and for x = 0, 0.02, 0.05, and 1. For the semiconducting samples (x = 0, 0.02, and 0.05) the results below 200 K are consistent with the presence of a small gap in the quasiparticle excitation spectrum; above 200 K there is an anomalous contribution to the thermal expansion that lacks a detailed explanation, but which is probably associated with the high density of conduction electrons found in FeSi above 200 K. RP MANDRUS, D (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Mandrus, David/H-3090-2014 NR 7 TC 3 Z9 3 U1 0 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 471 EP 472 DI 10.1016/0921-4526(94)91872-4 PG 2 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800157 ER PT J AU SARRAO, JL MANDRUS, D MIGLIORI, A FISK, Z BUCHER, E AF SARRAO, JL MANDRUS, D MIGLIORI, A FISK, Z BUCHER, E TI ELASTIC PROPERTIES OF FESI SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO AB We present measurements of the complete elastic constants of single-crystal FeSi using resonant ultrasound spectroscopy (RUS). FeSi is a narrow-gap (0.05 eV) semiconductor whose physical properties are similar to a class of compounds known as hybridization gap semiconductors or Kondo insulators. The narrow gap is reflected in the temperature dependence of the elastic moduli. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. RP SARRAO, JL (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Mandrus, David/H-3090-2014 NR 8 TC 30 Z9 30 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 478 EP 479 DI 10.1016/0921-4526(94)91875-9 PG 2 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800160 ER PT J AU SEVERING, A PERRING, T THOMPSON, JD CANFIELD, PC FISK, Z AF SEVERING, A PERRING, T THOMPSON, JD CANFIELD, PC FISK, Z TI SPIN-HOLE DOPING IN THE KONDO INSULATOR CE3BI4PT3 STUDIED BY NEUTRON-SCATTERING SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID GAP AB Inelastic neutron scattering from (Ce1-xLax)3Bi4Pt3, with x = 0, 0.1 and 0.25, shows that a gap in the spin excitation spectrum decreases monotonically with increasing x and remains well-defined even for x = 0.25. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE. RUTHERFORD LAB,RUTHERFORD,ENGLAND. AMES LAB,AMES,IA 50011. RI Canfield, Paul/H-2698-2014 NR 11 TC 4 Z9 4 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 480 EP 482 DI 10.1016/0921-4526(94)91876-7 PG 3 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800161 ER PT J AU COOLEY, JC ARONSON, MC FISK, Z CANFIELD, PC AF COOLEY, JC ARONSON, MC FISK, Z CANFIELD, PC TI HIGH-PRESSURE INSULATOR-METAL TRANSITION IN SMB6 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID KONDO INSULATORS AB We report the temperature and pressure dependence of the electrical resistivity and HalL constant of single crystal SmB6 for temperatures ranging from 1.2 K to room temperature, and pressures from 1 bar to 80 kbar. Our results indicate that at low pressures SmB6 is an insulator, but undergoes a sudden transition to metallic behavior at a pressure of 50 kbar. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP COOLEY, JC (reprint author), UNIV MICHIGAN,ANN ARBOR,MI 48109, USA. RI Cooley, Jason/E-4163-2013; Canfield, Paul/H-2698-2014 NR 11 TC 6 Z9 6 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 486 EP 488 DI 10.1016/0921-4526(94)91878-3 PG 3 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800163 ER PT J AU BUCHER, B SCHLESINGER, Z CANFIELD, PC FISK, Z AF BUCHER, B SCHLESINGER, Z CANFIELD, PC FISK, Z TI CHARGE DYNAMICS IN THE KONDO INSULATOR CE3BI4PT3 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID GAP AB We report the reflectivity and optical conductivity of the Kondo insulator Ce3Bi4Pt3. For temperatures less than 100 K, depletion of the conductivity below about 300 cm-1 signifies the development of a charge gap. The temperature dependence of the disappearance of the spectral weight scales with the quenching of the Ce 4f moments. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP BUCHER, B (reprint author), IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598, USA. RI Canfield, Paul/H-2698-2014 NR 6 TC 5 Z9 5 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 489 EP 491 DI 10.1016/0921-4526(94)91879-1 PG 3 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800164 ER PT J AU GULACSI, M BEDELL, KS AF GULACSI, M BEDELL, KS TI SPECTRAL-FUNCTION OF THE 1D HUBBARD-MODEL SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID EXCITATIONS AB For the one-dimensional (1D) Hubbard model, we extended the bosonization technique, away from half filling, in such a way that a general formula is obtained for the zero temperature equal-time single-particle Green function with validity over the whole doping range. With our method, we can calculate, for the first time, the one-body Green function and thus, the spectral function in both the Tomonaga-Luttinger and Luther-Emery universality classes. The method also gives a tool to determine the coefficients of the correlation functions which cannot be determined with previously used methods. RP GULACSI, M (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,MS-B262,LOS ALAMOS,NM 87545, 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 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 492 EP 494 DI 10.1016/0921-4526(94)91880-5 PG 3 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800165 ER PT J AU FYE, RM SCALAPINO, DJ AF FYE, RM SCALAPINO, DJ TI MAGNETIC-STRUCTURE FACTORS AND SUSCEPTIBILITIES OF THE ONE-DIMENSIONAL KONDO INSULATOR SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID QUANTUM MONTE-CARLO; LATTICE AB The Kondo insulator CeNiSn shows substantial antiferromagnetic correlations along one axis, but does not show analogous structure in the corresponding spin susceptibility. In an attempt to understand this behavior, we perform quantum Monte Carlo simulations of the one-dimensional Kondo insulator. We first describe the model and the quantum Monte Carlo technique used, and then compare our results with the experimental data. The model appears inadequate to describe the observed CeNiSn susceptibility behavior. C1 UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. RP FYE, RM (reprint author), SANDIA NATL LABS,DEPT 1421,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 11 TC 0 Z9 0 U1 2 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 495 EP 497 DI 10.1016/0921-4526(94)91881-3 PG 3 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800166 ER PT J AU GRAF, T THOMPSON, JD CANFIELD, PC MAPLE, MB FISK, Z AF GRAF, T THOMPSON, JD CANFIELD, PC MAPLE, MB FISK, Z TI EFFECT OF HIGH-PRESSURE AND MAGNETIC-FIELD ON THE ELECTRICAL-RESISTIVITY OF YBAGCU4 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO AB The electrical resistivity of YbAgCu4 has been measured at pressures up to 100 kbar and at temperatures between 1 and 300 K. With increasing pressure, the resistivity maximum shifts to lower temperatures and the coherent regime disappears above about 60 kbar. At the highest pressures, a field of 8 T produces a large negative magnetoresistance, roughly equivalent to a negative pressure of 30 kbar. The behavior is consistent with a pressure-induced decrease in the Kondo temperature. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. RP GRAF, T (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Canfield, Paul/H-2698-2014 NR 6 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 520 EP 521 DI 10.1016/0921-4526(94)91890-2 PG 2 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800175 ER PT J AU THOMPSON, JD UWATOKO, Y GRAF, T HUNDLEY, MF MANDRUS, D GODART, C GUPTA, LC CANFIELD, PC MIGLIORI, A BORGES, HA AF THOMPSON, JD UWATOKO, Y GRAF, T HUNDLEY, MF MANDRUS, D GODART, C GUPTA, LC CANFIELD, PC MIGLIORI, A BORGES, HA TI MAGNETISM IN CERU2GE2 AND CERH2GE2 AND ITS PRESSURE-DEPENDENCE SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID HEAVY; SUPERCONDUCTIVITY; URU2SI2 AB We have studied magnetism in CeRu2Ge2 and CeRh2Ge2 through specific heat in zero and applied magnetic fields, DC magnetization, thermal expansion and electrical resistance measurements at pressures to 21 kbar. Both compounds have two magnetic transitions; although we argue that the higher one in CeRu2Ge2 is due to residual stress in the polycrystalline sample. The overall systematics are consistent with those found at ambient pressure in pseudoternaries formed with Si substitution for Ge. C1 KUMAMOTO UNIV,KUMAMOTO 860,JAPAN. TIFR,BOMBAY,INDIA. CNRS,MEUDON,FRANCE. AMES LAB,AMES,IA. PONTIFICIA UNIV CATOLICA RIO DE JANEIRO,BR-20000 RIO JANEIRO,BRAZIL. RP THOMPSON, JD (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Mandrus, David/H-3090-2014; Canfield, Paul/H-2698-2014 NR 15 TC 25 Z9 25 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 589 EP 592 DI 10.1016/0921-4526(94)91914-3 PG 4 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800199 ER PT J AU GREVEN, M BIRGENEAU, RJ ENDOH, Y KASTNER, MA KEIMER, B MATSUDA, M SHIRANE, G THURSTON, TR AF GREVEN, M BIRGENEAU, RJ ENDOH, Y KASTNER, MA KEIMER, B MATSUDA, M SHIRANE, G THURSTON, TR TI SPIN CORRELATIONS IN SR2CUO2CL2 SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Strongly Correlated Electron Systems (SCES 93) CY AUG 16-19, 1993 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, UNIV CALIF SAN DIEGO, AMER PHYS SCI, INST MECH & MAT, INT SCI FDN, WASHINGTON, DC, LOS ALAMOS NATL LAB, NATL HIGH MAGNET FIELD LAB, US DOE, US NATL SCI FDN HO UNIV CALIF SAN DIEGO ID QUANTUM MONTE-CARLO; HEISENBERG-ANTIFERROMAGNET; LOW-TEMPERATURES; LA2CUO4; PURE AB Only recently has it become clear that quantum fluctuations do not destroy long-range order in the ground state of the 2D S = 1/2 square-lattice Heisenberg antiferromagnet. We report a neutron scattering study of the static structure factor of Sr2CuO2Cl2, which is an optimal experimental realization of this model. Excellent agreement for the magnetic correlation length is found to exist between theory, Monte Carlo results and our experiment. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. TOHOKU UNIV,DEPT PHYS,SENDAI,MIYAGI 980,JAPAN. RP GREVEN, M (reprint author), MIT,DEPT PHYS,CAMBRIDGE,MA 02139, USA. RI Matsuda, Masaaki/A-6902-2016 OI Matsuda, Masaaki/0000-0003-2209-9526 NR 10 TC 3 Z9 3 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 642 EP 643 DI 10.1016/0921-4526(94)91932-1 PG 2 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800217 ER PT J AU GUERTIN, RP FISK, Z MAPLE, MB SHAM, LJ AF GUERTIN, RP FISK, Z MAPLE, MB SHAM, LJ TI PROCEEDINGS OF THE INTERNATIONAL-CONFERENCE ON STRONGLY CORRELATED ELECTRON-SYSTEMS SCES 93 HELD IN SAN-DIEGO, USA 16-19 AUGUST 1993 - PREFACE SO PHYSICA B LA English DT Editorial Material C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. UNIV CALIF SAN DIEGO,INST PURE & APPL PHYS SCI,LA JOLLA,CA 92093. RP GUERTIN, RP (reprint author), TUFTS UNIV,GRAD SCH ARTS & SCI,MEDFORD,MA 02155, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP R7 EP R8 PG 2 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800001 ER PT J AU PYNN, R BAKER, S AF PYNN, R BAKER, S TI NEUTRON REFLECTION FROM FACETED SURFACES SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Surface X-Ray and Neutron Scattering (SXNS-3) CY JUN 24-29, 1993 CL DUBNA, RUSSIA SP JOINT INST NUCL RES, FRANK LAB NEUTRON PHYS, COMMISS EUROPEAN COMMUNITY ID ROUGH SURFACES; X-RAY; SCATTERING AB Diffuse scattering, often taken as evidence that a surface is rough on very small length scales, can also arise when neutrons (or X-rays) are reflected from a surface composed of many smooth facets. For a surface composed of facets misoriented with respect to the average surface, the diffuse scattering displays a fringe at a wave vector transfer perpendicular to the surface that is equal to twice the critical wave vector. The damping of the specular reflectivity does not follow the usual Nevot-Croce form for such a faceted surface. A surface morphology of this type can explain data we have obtained by reflecting neutrons from several different samples including one of polished silicon. RP PYNN, R (reprint author), LOS ALAMOS NATL LAB,MANUEL LUJAN JR NEUTRON SCATTERING CTR,LOS ALAMOS,NM 87545, USA. NR 6 TC 6 Z9 6 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 198 IS 1-3 BP 1 EP 6 DI 10.1016/0921-4526(94)90113-9 PG 6 WC Physics, Condensed Matter SC Physics GA NR013 UT WOS:A1994NR01300002 ER PT J AU FELCHER, GP AF FELCHER, GP TI FORWARD SCATTERING OF NEUTRONS FROM POLYMERIC AND MAGNETIC MULTILAYERS SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Surface X-Ray and Neutron Scattering (SXNS-3) CY JUN 24-29, 1993 CL DUBNA, RUSSIA SP JOINT INST NUCL RES, FRANK LAB NEUTRON PHYS, COMMISS EUROPEAN COMMUNITY ID X-RAY-SCATTERING; DIBLOCK COPOLYMERS; ROUGH SURFACES; REFLECTIVITY; MAGNETORESISTANCE; CO/RU AB Grazing incidence neutrons are not only reflected and refracted from imperfect layers, but also partially scattered by lateral dishomogeneities. In general, scattering may take place both in the reflection plane (''forward scattering'') and out of it. The forward scattering from multilayers is highly structured in ridges, whose maxima can be indexed in terms of the multilayer spacings. In experiments on diverse diblock copolymers, two kinds of ridges were found, either at constant-k(z) loci or else at constant-q(z) loci. The relative intensity of the ridges appears to be related to the type and size of imperfections of the lamellar structure. Constant-q, streaks of magnetic nature were also found in the forward scattering of metallic superlattices (Fe/Cr, Co/Ru, Fe/Nb) in the antiferromagnetic state. Here the diffuse scattering appears around the antiferromagnetic peaks while they are absent from the structural peaks, as if the crystalline superlattice were to partition into antiferromagnetic domains of limited lateral extension and columnar character. RP FELCHER, GP (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 22 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 198 IS 1-3 BP 150 EP 155 DI 10.1016/0921-4526(94)90150-3 PG 6 WC Physics, Condensed Matter SC Physics GA NR013 UT WOS:A1994NR01300039 ER PT J AU FITZSIMMONS, MR SMITH, GS PYNN, R NASTASI, MA BURKEL, E AF FITZSIMMONS, MR SMITH, GS PYNN, R NASTASI, MA BURKEL, E TI THE MAGNETIC-STRUCTURES OF PLANAR INTERFACES SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Surface X-Ray and Neutron Scattering (SXNS-3) CY JUN 24-29, 1993 CL DUBNA, RUSSIA SP JOINT INST NUCL RES, FRANK LAB NEUTRON PHYS, COMMISS EUROPEAN COMMUNITY ID X-RAY-DIFFRACTION; ATOMIC-STRUCTURE; TWIST BOUNDARY; GOLD AB The magnetization density profiles of two planar interfaces are deduced from polarized neutron reflectometry measurements. The first interface is the phase boundary between a thin Fe film and a MgO substrate; the second, a [0 0 1] twist grain boundary between two thin films of Ni that were hot-pressed together. The atomic densities of both boundary regions were determined to be less than those of the neighboring thin films, while the average magnetic moments per atom were increased compared to the bulk films. C1 UNIV MUNICH,LEHRSTUHL PEISL,SEKT PHYS,W-8000 MUNICH 2,GERMANY. RP FITZSIMMONS, MR (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Lujan Center, LANL/G-4896-2012 NR 5 TC 9 Z9 9 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 198 IS 1-3 BP 169 EP 172 DI 10.1016/0921-4526(94)90153-8 PG 4 WC Physics, Condensed Matter SC Physics GA NR013 UT WOS:A1994NR01300042 ER PT J AU YOU, H NAGY, Z AF YOU, H NAGY, Z TI OXIDATION-REDUCTION-INDUCED ROUGHENING OF PLATINUM (111) SURFACE SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Surface X-Ray and Neutron Scattering (SXNS-3) CY JUN 24-29, 1993 CL DUBNA, RUSSIA SP JOINT INST NUCL RES, FRANK LAB NEUTRON PHYS, COMMISS EUROPEAN COMMUNITY ID SCANNING TUNNELING MICROSCOPY; X-RAY-REFLECTIVITY; ON-SOLID MODEL; TRANSMISSION GEOMETRY; GROWTH; ELECTRODES; SCATTERING; PT(111) AB Platinum (1 1 1) single-crystal surface was roughened by repeated cycles of oxidation and reduction to study dynamic evolution of surface roughening. The interface roughens progressively upon repeated cycles. The measured width of the interface was fit to an assumed power law, W is similar to t(beta), with beta = 0.38(1). The results are compared with a simulation based on a random growth model. The fraction of the singly stepped surface apparently saturates to 0.25 monolayer, which explains the apparent saturation to a steady-state roughness observed in previous studies. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439. RP YOU, H (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI You, Hoydoo/A-6201-2011 OI You, Hoydoo/0000-0003-2996-9483 NR 18 TC 14 Z9 14 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 198 IS 1-3 BP 187 EP 194 DI 10.1016/0921-4526(94)90157-0 PG 8 WC Physics, Condensed Matter SC Physics GA NR013 UT WOS:A1994NR01300046 ER PT J AU ALMASAN, CC HAN, SH YOSHIARA, K BUCHGEISTER, M LEE, BW PAULIUS, LM GAJEWSKI, DA MAPLE, MB AF ALMASAN, CC HAN, SH YOSHIARA, K BUCHGEISTER, M LEE, BW PAULIUS, LM GAJEWSKI, DA MAPLE, MB TI HALL-EFFECT STUDIES OF THE MIXED AND NORMAL STATES OF Y(1-X)PR(X)BA2CU3O(7-DELTA) SINGLE-CRYSTALS (0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1) SO PHYSICA B-CONDENSED MATTER LA English DT Article ID YBA2CU3O7-DELTA; BEHAVIOR; FILMS; ANGLE AB Hall effect measurements on single-crystal specimens of Y1-xPrxBa2Cu3O7-delta (0 less-than-or-equal-to x less-than-or-equal-to 1) reveal a ''negative Hall anomaly'' below T(c), in the superconducting state. The depth DELTA of the negative Hall signal scales with T/T(c) and the maximum value of DELTA decreases linearly with x and vanishes at x almost-equal-to 0.24. These results show that the sign anomaly is not consistent with models that invoke pinning to explain this effect, and suggest that the negative anomaly could have an intrinsic origin. Hall effect measurements in the normal state show that the cotangent of the Hall angle can be described by cot THETA(H) = AT2 + B with both A and B increasing linearly with decreasing T(c), in agreement with recent reports on Y1-xPrxBa2Cu3O7-delta thin films. C1 UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, LA JOLLA, CA 92093 USA. LOS ALAMOS NATL LAB, CTR MAT SCI, LOS ALAMOS, NM 87545 USA. RP ALMASAN, CC (reprint author), UNIV CALIF SAN DIEGO, DEPT PHYS, LA JOLLA, CA 92093 USA. NR 16 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 288 EP 290 DI 10.1016/0921-4526(94)91814-7 PG 3 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800099 ER PT J AU SEAMAN, CL MAPLE, MB AF SEAMAN, CL MAPLE, MB TI NON-FERMI-LIQUID AND MULTICHANNEL KONDO PHENOMENA IN Y(1-X)U(X)PD3 AND RELATED ALLOYS SO PHYSICA B-CONDENSED MATTER LA English DT Article ID Y1-XUXPD3; BEHAVIOR AB A brief review of experimental results which reveal non-Fermi-liquid behavior in the low-temperature properties of the M1-xUxPd3 (M = rare earth or Th) Kondo alloy system is presented. Measurements of lattice parameters, electrical resistivity, magnetic susceptibility, low-temperature specific heat, and magnetic neutron scattering are compared to predictions of the multichannel Kondo model, and are generally consistent with a two-channel spin-1/2 quadrupolar Kondo effect. Possible deviations from the model due to crystalline electric field effects, interionic interactions, disorder, and Fermi-level tuning aspects are discussed. C1 UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, LA JOLLA, CA 92093 USA. LOS ALAMOS NATL LAB, CTR MAT SCI, LOS ALAMOS, NM 87545 USA. RP SEAMAN, CL (reprint author), UNIV CALIF SAN DIEGO, DEPT PHYS, LA JOLLA, CA 92093 USA. NR 21 TC 29 Z9 29 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 396 EP 401 DI 10.1016/0921-4526(94)91849-X PG 6 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800134 ER PT J AU MAPLE, MB GAJEWSKI, DA SEAMAN, CL ALLEN, JW AF MAPLE, MB GAJEWSKI, DA SEAMAN, CL ALLEN, JW TI FERMI-LEVEL TUNING IN (Y(1-Y)M(Y))(1-X)U(X)PD3 (M=TH, LA) SO PHYSICA B-CONDENSED MATTER LA English DT Article ID Y1-XUXPD3 AB The effects of the increase of the U 5f binding energy and the decrease in the localized U 5f electron-conduction electron hybridization on the Kondo temperature, with U intersite interactions held constant to first approximation, are under investigation by means of electrical resistivity, magnetic susceptibility, and specific heat as a function of y for fixed values of x in the (Y1-yMy)1-xUxPd3 (M = Th, La) systems. C1 LOS ALAMOS NATL LAB, CTR MAT SCI, LOS ALAMOS, NM 87545 USA. UNIV CALIF SAN DIEGO, INST PURE & APPL PHYS SCI, LA JOLLA, CA 92093 USA. UNIV MICHIGAN, RANDALL LAB, ANN ARBOR, MI 48109 USA. RP MAPLE, MB (reprint author), UNIV CALIF SAN DIEGO, DEPT PHYS, LA JOLLA, CA 92093 USA. NR 5 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 423 EP 425 DI 10.1016/0921-4526(94)91857-0 PG 3 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800142 ER PT J AU SARMA, DD KRUMMACHER, S GUDAT, W LIN, CL ZHOU, LW CROW, JE KOELLING, DD AF SARMA, DD KRUMMACHER, S GUDAT, W LIN, CL ZHOU, LW CROW, JE KOELLING, DD TI RESONANT PHOTOEMISSION-STUDIES OF THE MAGNETIC NONMAGNETIC U(SN, IN)3 SYSTEM SO PHYSICA B-CONDENSED MATTER LA English DT Article AB Results of 5d-5f resonant photoemission studies on the related series of uranium intermetallic compounds, U(SnxIn1-x)3 for x = 1.0, 0.5 and 0.0 are presented. Various features seen in the spectra are analyzed in terms of calculated partial densities of states. With the help of difference spectra between on and off resonance spectra obtained at photon energies of 98 and 92 eV, respectively, it is shown that spectral shapes of the U 5f related features do not exhibit any significant change within the series, even though the electronic and magnetic properties of these compounds are drastically different. A brief discussion of the implications of these observations is also presented. C1 TEMPLE UNIV, DEPT PHYS, PHILADELPHIA, PA 19122 USA. BESSY GMBH, BERLIN 33, GERMANY. NATL HIGH MAGNET FIELD LAB, TALLAHASSEE, FL 32306 USA. ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. FORSCHUNGSZENTRUM JULICH, IFF, W-5170 JULICH 1, GERMANY. RP SARMA, DD (reprint author), INDIAN INST SCI, SOLID STATE & STRUCT CHEM UNIT, BANGALORE 560012, KARNATAKA, INDIA. RI Sarma, D. D./B-2576-2010 OI Sarma, D. D./0000-0001-6433-1069 NR 6 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1994 VL 199 BP 622 EP 624 DI 10.1016/0921-4526(94)91925-9 PG 3 WC Physics, Condensed Matter SC Physics GA NV538 UT WOS:A1994NV53800210 ER PT J AU LIU, HB MORRIS, DE SINHA, APB KWEI, GH AF LIU, HB MORRIS, DE SINHA, APB KWEI, GH TI EFFECT OF PRASEODYMIUM SUBSTITUTION IN YBA2CU4O8 (1-2-4) SO PHYSICA C LA English DT Article ID NORMAL-STATE PROPERTIES; NEUTRON-DIFFRACTION; PHYSICAL-PROPERTIES; SUPERCONDUCTIVITY; PR; Y1-XPRXBA2CU3O7-DELTA; PRBA2CU3O7; VALENCE; PHASE; SUPPRESSION AB Pr substituted YBa2Cu4O8 (1:2:4) has been synthesized by a solid-state reaction at 930-degrees-C-950-degrees-C in 200 bar oxygen pressure. Pr could be substituted only up to 20% i.e., Y0.8Pr0.2Ba2Cu4O8. T(c) decreased with increasing Pr; however, T(c) could be restored by co-substitution of Ca along with Pr which was possible up to Pr = 0.2 and Ca = 0.1. XANES indicated the presence of Pr3+ but not Pr4+. In 1:2:4, T(c) depends on the rare-earth ion size, and Pr3+ ions cause only a small additional suppression of T(c) below that expected from the size of Pr3+. The large ''Pr effect'' in the suppression of T(c) of 1:2:3 is thus a special property of the 1:2:3 structure. C1 UNIV CALIF BERKELEY,DEPT MAT SCI,BERKELEY,CA 94720. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP LIU, HB (reprint author), MORRIS RES INC,1918 UNIV AVE,BERKELEY,CA 94704, USA. NR 28 TC 10 Z9 11 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD APR 1 PY 1994 VL 223 IS 1-2 BP 51 EP 56 DI 10.1016/0921-4534(94)90693-9 PG 6 WC Physics, Applied SC Physics GA NF319 UT WOS:A1994NF31900007 ER PT J AU DORRIS, SE PROROK, BC LANAGAN, MT BROWNING, NB HAGEN, MR PARRELL, JA FENG, Y UMEZAWA, A LARBALESTIER, DC AF DORRIS, SE PROROK, BC LANAGAN, MT BROWNING, NB HAGEN, MR PARRELL, JA FENG, Y UMEZAWA, A LARBALESTIER, DC TI METHODS OF INTRODUCING LEAD INTO BISMUTH-2223 AND THEIR EFFECTS ON PHASE DEVELOPMENT AND SUPERCONDUCTING PROPERTIES SO PHYSICA C LA English DT Article ID CA-CU-O; CRITICAL-CURRENT-DENSITY; TAPES AB The specific method of introducing lead significantly influences the phase development and superconducting properties of Pb-doped Bi2Sr2Ca2Cu3O(x) (BSCCO-2223) Ag-sheated powder-in-tube tapes. This is demonstrated in a study of tapes made from a series of powder mixtures containing the phases Bi1.8Pb(z)Sr2.0Ca1.0Cu2.0O8 (2212), Ca2PbO4, Ca2CuO3, and CuO, where the lead content of 2212, z, was varied from 0.0 to 0.4. The overall composition of each mixture was the same, (Bi1.8Pb0.4Sr2.0Ca2.0Cu3.0O10), and the amounts of each phase were varied to compensate for changes in z. In an additional mixture made from lead-free 2212, Ca2CuO3, and CuO, all lead was added as PbO. A significantly more complete 2223 formation, sharper transition temperatures, and higher critical current densities were seen when all lead was incorporated in the 2212 phase, rather than being added as either PbO or Ca2PbO4. C1 UNIV WISCONSIN,CTR APPL SUPERCOND,MADISON,WI 53706. RP DORRIS, SE (reprint author), ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439, USA. RI Prorok, Barton/A-7404-2010; Larbalestier, David/B-2277-2008 OI Larbalestier, David/0000-0001-7098-7208 NR 20 TC 63 Z9 63 U1 3 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD APR 1 PY 1994 VL 223 IS 1-2 BP 163 EP 172 DI 10.1016/0921-4534(94)90709-9 PG 10 WC Physics, Applied SC Physics GA NF319 UT WOS:A1994NF31900023 ER PT J AU CHENG, S DUNFORD, RW LIU, CJ ZABRANSKY, BJ LIVINGSTON, AE CURTIS, LJ AF CHENG, S DUNFORD, RW LIU, CJ ZABRANSKY, BJ LIVINGSTON, AE CURTIS, LJ TI M1 DECAY OF THE 2(3)S(1) STATE IN HELIUM-LIKE KRYPTON SO PHYSICAL REVIEW A LA English DT Article ID ISOELECTRONIC SEQUENCE; ONE-ELECTRON; 23S1 STATE; LIFETIME; IONS; HYDROGENLIKE; ATOMS; TRANSITIONS; NICKEL; RATES AB We report a measurement of the lifetime of the 2 S-3(1) state in two-electron krypton. The lifetime is found to be 171.0 +/- 2.2 ps, which is in reasonable agreement with current theoretical calculations. This measurement provides a test of the order (Zalpha)2 relativistic corrections to this lifetime. C1 ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556. RP CHENG, S (reprint author), UNIV TOLEDO,DEPT PHYS & ASTRON,TOLEDO,OH 43606, USA. NR 54 TC 14 Z9 14 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR PY 1994 VL 49 IS 4 BP 2347 EP 2353 DI 10.1103/PhysRevA.49.2347 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NG485 UT WOS:A1994NG48500020 ER PT J AU SCOFIELD, JH NILSEN, J AF SCOFIELD, JH NILSEN, J TI HYPERFINE SPLITTINGS OF NEON-LIKE LASING LINES SO PHYSICAL REVIEW A LA English DT Article ID X-RAY LASER; GAIN AB The hyperfine splitting of a soft-x-ray lasing line coming from neonlike niobium has recently been measured and the effect of the splitting on the gain coefficient observed, as reported earlier. In this work, the hyperfine splittings for the principal 3p --> 3s neonlike lasing lines due to the coupling with the dipole magnetic moment of the nucleus are calculated for atomic numbers Z from 17 through 59 in the framework of the relativistic multiconfiguration-atomic-structure theory. The diminution of the gains due to the splittings in the case of Doppler-broadened lines is calculated. The parameters for the splitting of the 2p-to-2s transitions in fluorinelike ions and the 3p-to-3s and 3d-to-3p transitions in sodiumlike ions are also presented. RP SCOFIELD, JH (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 38 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR PY 1994 VL 49 IS 4 BP 2381 EP 2388 DI 10.1103/PhysRevA.49.2381 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NG485 UT WOS:A1994NG48500023 ER PT J AU GLISH, GL GREAVES, RG MCLUCKEY, SA HULETT, LD SURKO, CM XU, J DONOHUE, DL AF GLISH, GL GREAVES, RG MCLUCKEY, SA HULETT, LD SURKO, CM XU, J DONOHUE, DL TI ION PRODUCTION BY POSITRON-MOLECULE RESONANCES SO PHYSICAL REVIEW A LA English DT Article ID COLLISIONS AB Ion production by low-energy positrons in low-density gases was reported by Passner, Surko, Mills, and Leventhal [Phys. Rev. A 39, 3706 (1989)]. That work studied the ionization of hydrocarbons in a positron trap in the presence of a buffer ps of molecular nitrogen. We present further analysis of the data from this experiment, taking into consideration the ionization of the hydrocarbons by nitrogen ions created as a result of the positron trapping process. We conclude that ionization by positrons was the dominant ion production mechanism at times longer than the characteristic ion confinement time of approximately 1 s, while ionization by nitrogen charge exchange was dominant at earlier times. The details of the ionization spectra are also discussed. C1 OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. RI McLuckey, Scott/B-2203-2009 OI McLuckey, Scott/0000-0002-1648-5570 NR 11 TC 13 Z9 13 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR PY 1994 VL 49 IS 4 BP 2389 EP 2393 DI 10.1103/PhysRevA.49.2389 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NG485 UT WOS:A1994NG48500024 ER PT J AU MULLER, J YANG, XZ BURGDORFER, J AF MULLER, J YANG, XZ BURGDORFER, J TI CALCULATION OF RESONANCES IN DOUBLY-EXCITED HELIUM USING THE STABILIZATION METHOD SO PHYSICAL REVIEW A LA English DT Article ID SPECTROSCOPIC OBSERVATION; PROPENSITY RULES; RYDBERG STATES; ENERGY-LEVELS; ATOMS; EXCITATION; BARIUM; HE; CA; CLASSIFICATION AB Mandelshtam, Ravuri, and Taylor [Phys. Rev. Lett. 70, 1932 (1993)] have recently proposed a novel approach for the calculation of resonance states in one- and two-channel problems. We show that a modification of this approach, suitable for stabilization calculations, can yield both the resonance position and width for doubly excited states in two-electron systems. This provides a simple and numerically efficient method to calculate the spectral density of states. In the region of overlapping 1S(e) Rydberg manifolds, we find very narrow resonances associated with the symmetric excitation of both electrons. The mechanism for the occurrence of such resonances is discussed. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP MULLER, J (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 44 TC 55 Z9 55 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR PY 1994 VL 49 IS 4 BP 2470 EP 2475 DI 10.1103/PhysRevA.49.2470 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NG485 UT WOS:A1994NG48500037 ER PT J AU KIMURA, M DALGARNO, A CHANTRANUPONG, L LI, Y HIRSCH, G BUENKER, RJ AF KIMURA, M DALGARNO, A CHANTRANUPONG, L LI, Y HIRSCH, G BUENKER, RJ TI NONRADIATIVE AND RADIATIVE ELECTRON-CAPTURE IN COLLISIONS OF HE+ IONS WITH C-ATOMS BELOW 1000 EV SO PHYSICAL REVIEW A LA English DT Article ID ENERGY EXTRAPOLATION; CONFIGURATION AB Nonradiative and radiative electron captures in collisions of He' ions with carbon atoms at energies below 1 keV are studied theoretically by using a molecular-orbital expansion method to calculate the adiabatic potential-energy curves and the nonadiabatic coupling matrix elements of CHe+. The corresponding scattering equations are solved. For nonradiative transitions, electron capture into channels separating to He+C+(2D) are found to be dominant below 10 eV. However, as the energy increases, the channels separating to He+C+(2P) take over because of the positive asymptotic energy defect. At 100 eV, the nonradiative capture cross section is 5 X 10(-17) cm2. The radiative electron-capture cross section is found to be very small, with a magnitude nowhere greater than 10(-22) cm2. C1 BERG UNIV GESAMTHSCH WUPPERTAL,D-42097 WUPPERTAL,GERMANY. ARGONNE NATL LAB,ARGONNE,IL 60439. RICE UNIV,DEPT PHYS,HOUSTON,TX 77251. RP KIMURA, M (reprint author), HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138, USA. NR 18 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR PY 1994 VL 49 IS 4 BP 2541 EP 2544 DI 10.1103/PhysRevA.49.2541 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NG485 UT WOS:A1994NG48500046 ER PT J AU GIL, TJ LENGSFIELD, BH MCCURDY, CW RESCIGNO, TN AF GIL, TJ LENGSFIELD, BH MCCURDY, CW RESCIGNO, TN TI AB-INITIO COMPLEX KOHN CALCULATIONS OF DISSOCIATIVE EXCITATION OF METHANE - CLOSE-COUPLING CONVERGENCE STUDIES SO PHYSICAL REVIEW A LA English DT Article ID ELECTRON-IMPACT-EXCITATION; R-MATRIX CALCULATION; PSEUDO-STATE EXPANSION; VARIATIONAL METHOD; CROSS-SECTIONS; INTERMEDIATE ENERGIES; SCATTERING; HELIUM; CH4; MOLECULES AB Results of close-coupling calculations using the complex Kohn method are reported for excitation of the methane molecule into electronically dissociative states. The excited states in question are of Rydberg nature and are classified by analogy with the isoelectronic Ne atom as 2p --> 3s, 2p --> 3p, and 2p --> 3d transitions, i.e., single excitations of the valence 2p electron into the n = 3 Rydberg manifold. On the basis of optical selection rules, one expects large excitation probabilities to analogues of 1P odd-parity states. Our calculations in the energy range 11-60 eV show a more complex picture of the excitation dynamics and detect large excitation probabilities for triplet and even-parity (2p --> 3p) states. A similar result is obtained for the excitation of the Ne atom. Although, to the authors's knowledge, these are the largest close-coupling electron-polyatomic-molecule scattering calculations to date, the results lead to questions concerning the convergence of the close-coupling approach in the case of Rydberg-state excitation. Conclusions are drawn in the context of earlier results for electron-impact excitation of the H, He, and Ne atoms. RP GIL, TJ (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 37 TC 24 Z9 24 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR PY 1994 VL 49 IS 4 BP 2551 EP 2560 DI 10.1103/PhysRevA.49.2551 PG 10 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NG485 UT WOS:A1994NG48500048 ER PT J AU GIL, TJ RESCIGNO, TN MCCURDY, CW LENGSFIELD, BH AF GIL, TJ RESCIGNO, TN MCCURDY, CW LENGSFIELD, BH TI AB-INITIO COMPLEX KOHN CALCULATIONS OF DISSOCIATIVE EXCITATION OF WATER SO PHYSICAL REVIEW A LA English DT Article ID ELECTRON-ATTACHMENT; VARIATIONAL METHOD; H2O; SCATTERING; ENERGY; IMPACT; MOLECULE AB We report the results of close-coupling complex Kohn calculations of cross sections for electron-impact excitation of the water molecule into electronically dissociative states in the energy range from 8 to 30 eV. We have coupled five channels including the 1A1 ground state and excited singlet and triplet states formed by promoting the occupied 3a1 and 1b1 electrons to the lowest unoccupied 4a1 orbital. These states have theoretical vertical energies in the range from 8 to 12 eV and are known to be dissociative. Our calculations have confirmed the existence of Feshbach resonances related to the A1 and B1 excited states which are responsible for dissociative attachment in water at rather high energies. We found that these resonances indeed correspond to configurations 3a(1)4a1(2) and 1b(1)4a1(2). Our results include both total and differential cross sections. We also make comparison between theory and available experimental data. RP GIL, TJ (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 22 TC 34 Z9 35 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR PY 1994 VL 49 IS 4 BP 2642 EP 2650 DI 10.1103/PhysRevA.49.2642 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NG485 UT WOS:A1994NG48500058 ER PT J AU KIELKOPF, JF PINNADUWAGE, LA CHRISTOPHOROU, LG AF KIELKOPF, JF PINNADUWAGE, LA CHRISTOPHOROU, LG TI LASING IN AL FOLLOWING PHOTOIONIZATION AND NEUTRALIZATION IN THE PRESENCE OF H-2 - THE ROLE OF H- SO PHYSICAL REVIEW A LA English DT Article ID ELECTRON-ION RECOMBINATION; DISSOCIATIVE ATTACHMENT; EXCITED H-2 AB Atomic Al develops a population inversion and stimulated emission in the resonance fines when a solid target in a H-2 buffer gas is irradiated with ArF 1930-angstrom laser light. We present experimental evidence that the H- ion is responsible for this effect, through charge-neutralizing collisions with Al+. C1 OAK RIDGE NATL LAB,DIV HLTH SCI RES,ATOM MOLEC & HIGH VOLTAGE PHYS GRP,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. RP KIELKOPF, JF (reprint author), UNIV LOUISVILLE,DEPT PHYS,LOUISVILLE,KY 40292, USA. NR 14 TC 7 Z9 7 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR PY 1994 VL 49 IS 4 BP 2675 EP 2680 DI 10.1103/PhysRevA.49.2675 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NG485 UT WOS:A1994NG48500061 ER PT J AU KRESIN, VV SCHEIDEMANN, A KNIGHT, WD AF KRESIN, VV SCHEIDEMANN, A KNIGHT, WD TI VAN-DER-WAALS INTERACTION OF FINITE METALLIC SYSTEMS - A STUDY OF CLUSTER-ATOM SCATTERING SO PHYSICAL REVIEW A LA English DT Article ID SURFACE; RESONANCES; BEAMS AB Absolute integral cross sections for elastic collisions of neutral sodium clusters Na(n) (n = 2-20) with sodium atoms have been measured and the van der Waals interaction constants determined. The center-of-mass cross sections are very large (up to thousands of square angstroms), reflecting high cluster polarizabilities. It is found that the dispersion theory based on measured response parameters of alkali-metal clusters tends to overestimate the interaction strength. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV WASHINGTON,DEPT CHEM,SEATTLE,WA 98195. RP KRESIN, VV (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Kresin, Vitaly/N-8095-2014 OI Kresin, Vitaly/0000-0002-6226-4576 NR 39 TC 13 Z9 13 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR PY 1994 VL 49 IS 4 BP 2696 EP 2701 DI 10.1103/PhysRevA.49.2696 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NG485 UT WOS:A1994NG48500064 ER PT J AU BOLDA, EL GARRISON, JC CHIAO, RY AF BOLDA, EL GARRISON, JC CHIAO, RY TI OPTICAL PULSE-PROPAGATION AT NEGATIVE GROUP VELOCITIES DUE TO A NEARBY GAIN LINE SO PHYSICAL REVIEW A LA English DT Article AB For a pulse with carrier frequency detuned less than an atomic plasma frequency but outside a narrow Lorentzian gain line, the group velocity will be negative. Unlike propagation at the center of an absorption line, the energy velocity is approximately equal to the group velocity, and is also negative. We show that a classical Gaussian pulse with such a carrier frequency will propagate at the negative group velocity for many atomic plasma wavelengths, before dispersion deforms the pulse shape. The peak of the transmitted pulse leaves the gain medium before the peak of the incident pulse enters, i.e., the pulse is transmitted superluminally. For a sufficiently long medium the exit pulse is well resolved from a comparison pulse traveling through an equal distance of vacuum. There is no conflict with causality, as numerical simulations with a switched-on Gaussian demonstrate. We propose an experiment to observe this kind of propagation by sending a pulsed probe beam through a Xe gas cell pumped to achieve inversion. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP BOLDA, EL (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 18 TC 129 Z9 132 U1 2 U2 8 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 APR PY 1994 VL 49 IS 4 BP 2938 EP 2947 DI 10.1103/PhysRevA.49.2938 PG 10 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NG485 UT WOS:A1994NG48500094 ER PT J AU BEIERSDORFER, P ELLIOTT, SR NILSEN, J AF BEIERSDORFER, P ELLIOTT, SR NILSEN, J TI RESONANT-LINE OVERLAP FOR PHOTOPUMPING AND SPOILING OF X-RAY LASING TRANSITIONS IN NEON-LIKE FE-XVII AND CU-XX SO PHYSICAL REVIEW A LA English DT Note ID HIGHLY CHARGED IONS; POPULATION-INVERSION; LASER; AMPLIFICATION; PLASMA; GERMANIUM AB High-precision measurements (25-175 ppm) have been performed of selected 2p-3s and 2p-4d transitions in neonlike Fe and Cu that are of possible use in resonant photopumping x-ray lasing experiments. A marginal resonance of 600 ppm is found for the 2p-4d transition in neonlike Fe with the 1s-2p transition in hydrogenic Ne. By contrast, an excellent resonance of 200 ppm is determined for photopumping of the 2p-4d transition in neonlike Cu with the 1s-2p transition in heliumlike Mg, suggesting that the Cu-Mg pair is a good candidate for resonant photopumping experiments. Moreover, the separation of the 2p-3s transition in neonlike Fe and the 1s-2p transition in heliumlike F is measured to assess the resonance for use in a scheme to spoil x-ray lasing. The overlap (2000 ppm), however, appears insufficient. RP BEIERSDORFER, P (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 30 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR PY 1994 VL 49 IS 4 BP 3123 EP 3126 DI 10.1103/PhysRevA.49.3123 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NG485 UT WOS:A1994NG48500120 ER PT J AU KIMURA, M GU, JP LI, Y HIRSCH, G BUENKER, RJ AF KIMURA, M GU, JP LI, Y HIRSCH, G BUENKER, RJ TI SUPPRESSED ELECTRON-CAPTURE IN SLOW O+((4)S(0),(2)D(0),(2)P(0))-HE COLLISIONS - COMMENT SO PHYSICAL REVIEW A LA English DT Letter ID LOW-ENERGY; O+; HE AB Electron capture in collisions of O+ ions with He atoms is studied on the basis of a molecular-orbital expansion approach. The cross section for electron capture by metastable O+(2D, 2P) ions is found to be larger by an order of magnitude than that for capture by ground-state O+(4S) ions over the entire energy region studied. The energy dependencies of cross sections for electron capture by the ground and metastable ions are found to differ considerably below 2 keV. The present result, obtained by combining the cross section of 90% of the ground state and that of 10% of metastable states, reproduces reasonably well the experimental result of Kusakabe et al. [J. Phys. Soc. Jpn. 59, 1987 (1990)], who reported using the mixture of the ground and metastable O+ ions. The present finding clearly contradicts another experimental result of Wolfrum et al. [Phys. Rev. A 45, R4218 (1992)], who reported no effect from the metastable states. C1 RICE UNIV,DEPT PHYS,HOUSTON,TX 77251. BERG UNIV GESAMTHSCH WUPPERTAL,D-42097 WUPPERTAL,GERMANY. UNIV SCI & TECHNOL CHINA,DEPT MODERN CHEM,HEFEI 230026,PEOPLES R CHINA. RP KIMURA, M (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 9 TC 16 Z9 16 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR PY 1994 VL 49 IS 4 BP 3131 EP 3133 DI 10.1103/PhysRevA.49.3131 PG 3 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NG485 UT WOS:A1994NG48500122 ER PT J AU SMITH, HG BERLINER, R TRIVISONNO, J AF SMITH, HG BERLINER, R TRIVISONNO, J TI ABSENCE OF PRECURSOR EFFECTS ABOVE THE MARTENSITIC-TRANSFORMATION IN A VIRGIN CRYSTAL OF LI METAL SO PHYSICAL REVIEW B LA English DT Article ID PHASE-TRANSITION; LITHIUM; BCC AB Measurements of the short-wavelength SIGMA4 phonons in a virgin crystal of Li metal at 293, 200, 100, and 80 K show a slight softening of the phonons with a decrease in temperature, as observed in some other alkali metals, contrary to all the other phonon branches measured in high-symmetry directions. Theoretical anharmonicity calculations predict this anomalous behavior even for Rb, which does not undergo a transformation. Diffuse scattering measurements in the vicinity of the (110) and (200) reflections at 200, 100, and 80 K did not reveal any unusual changes. There is an overall increase in the background as the temperature was decreased, which is attributed to the Debye-Waller factor associated with the large spin-incoherent scattering. The widths of the phonon groups also decreased as the temperature was lowered. These and other neutron-scattering measurements, along with ultrasonic attenuation studies fail to give evidence for precursor effects of the 9R transformation in virgin crystals of lithium metal. C1 UNIV MISSOURI, COLUMBIA, MO 65211 USA. JOHN CARROLL UNIV, DEPT PHYS, CLEVELAND, OH 44118 USA. RP SMITH, HG (reprint author), OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. NR 23 TC 14 Z9 14 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1994 VL 49 IS 13 BP 8547 EP 8551 DI 10.1103/PhysRevB.49.8547 PG 5 WC Physics, Condensed Matter SC Physics GA NG117 UT WOS:A1994NG11700001 ER PT J AU MCCARTHY, MI HARRISON, NM AF MCCARTHY, MI HARRISON, NM TI AB-INITIO DETERMINATION OF THE BULK PROPERTIES OF MGO SO PHYSICAL REVIEW B LA English DT Article ID HARTREE-FOCK; CORRELATION-ENERGY; MAGNESIUM-OXIDE; SEMICONDUCTORS; APPROXIMATION; SOLIDS AB Ab initio periodic Hartree-Fock (HF) theory was used to determine the elastic constants and selected phonon frequencies of bulk MgO; the accuracy of a posteriori correlation corrections to the periodic Hartree-Fock calculations is also discussed. Inclusion of diffuse atomic orbitals in the MgO basis was necessary to accurately describe elastic distortions and phonon vibrations of the solid. The computed HF lattice constant (4.195 angstrom) agrees with experiment (4.19 angstrom) and the elastic constants are within +15% of the observed values. Correlation corrections to these energetics shorten the lattice parameter to 4.09 angstrom and further stiffen the elastic constants. The HF phonon frequencies at the (GAMMA, X, and L) points in the Brillouin zone were within 15% of experiment and the correlation corrections softened the modes improving agreement with experiment. These data will be used to parametrize electrostatic shell models of C1 SERC, DARESBURY LAB, WARRINGTON WA4 4AD, CHESHIRE, ENGLAND. RP MCCARTHY, MI (reprint author), PACIFIC NW LAB, MSK1-90, RICHLAND, WA 99352 USA. RI Harrison, Nicholas/H-3198-2013 OI Harrison, Nicholas/0000-0001-7498-8144 NR 29 TC 86 Z9 86 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 APR 1 PY 1994 VL 49 IS 13 BP 8574 EP 8582 DI 10.1103/PhysRevB.49.8574 PG 9 WC Physics, Condensed Matter SC Physics GA NG117 UT WOS:A1994NG11700005 ER PT J AU WOLVERTON, C DEFONTAINE, D AF WOLVERTON, C DEFONTAINE, D TI CLUSTER EXPANSIONS OF ALLOY ENERGETICS IN TERNARY INTERMETALLICS SO PHYSICAL REVIEW B LA English DT Article ID MULTICOMPONENT SOLID-SOLUTIONS; TRANSITION-METAL ALLOYS; TIGHT-BINDING THEORY; VARIATION FORMALISM; ISING-MODEL; 1ST-PRINCIPLES; APPROXIMATION; STABILITY AB Ternary alloy energetics are examined for substitutional systems by a formal cluster expansion. In contrast to the binary-alloy problem, several distinct basis sets are possible for the ternary cluster expansion. Several of these sets of ternary basis functions are examined and compared, and relationships are derived between the expansion coefficients, or effective cluster interactions, expressed in various bases. The method of direct configurational averaging (DCA) (based on a tight-binding, linearized muffin-tin-orbital Hamiltonian) is extended to treat ternary alloy systems. Using the DCA, ternary, fcc-based effective pair and triplet interactions are computed for the Rh-V-Ti, Pd-Rh-V, and Ag-Pd-Rh systems, and convergence of the expansion is examined. By combining the cluster expansion with the results of the DCA computations, formation energies are obtained for the completely disordered state as a function of alloy composition. Both pair and triplet interactions are seen to be crucial towards obtaining quantitatively converged energetics. C1 UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT MAT SCI & MINERAL ENGN, BERKELEY, CA 94720 USA. RI Wolverton, Christopher/B-7542-2009 NR 37 TC 49 Z9 49 U1 0 U2 11 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 APR 1 PY 1994 VL 49 IS 13 BP 8627 EP 8642 DI 10.1103/PhysRevB.49.8627 PG 16 WC Physics, Condensed Matter SC Physics GA NG117 UT WOS:A1994NG11700012 ER PT J AU RAEKER, TJ DEPRISTO, AE AF RAEKER, TJ DEPRISTO, AE TI THEORETICAL PREDICTIONS OF HEATS OF FORMATION OF FCC BINARY TRANSITION-METAL ALLOYS USING THE CORRECTED EFFECTIVE-MEDIUM THEORY SO PHYSICAL REVIEW B LA English DT Article ID EMBEDDED-ATOM-METHOD; SURFACE SEGREGATION; MOLECULAR-DYNAMICS; ELECTRONIC THEORY; PHASE-STABILITY; THIN-FILMS; GROWTH; AG; AU; CU AB We present heats of formation of ordered fcc transition-metal binary alloys as predicted by the non-self-consistent electron density functional corrected effective-medium (CEM) theory. Two forms of the CEM theory are used. The first includes explicit numerical evaluation of the kinetic-exchange-correlation energy functional, a computationally intensive task. The second approximates this term as a local function of electron density and leads to a formulation that is very similar to the embedded-atom method. Calculated values of the energies of formation from the two forms of the CEM method are compared to each other and to experimental data. We demonstrate that both forms of the CEM theory provide formation energies accurate to within about 0.05-0.1 eV/atom (5-10 kJ/mol) for 3d and 4d binary alloys. C1 IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, US DOE, AMES LAB, AMES, IA 50011 USA. NR 55 TC 10 Z9 10 U1 1 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1994 VL 49 IS 13 BP 8663 EP 8670 DI 10.1103/PhysRevB.49.8663 PG 8 WC Physics, Condensed Matter SC Physics GA NG117 UT WOS:A1994NG11700015 ER PT J AU QIU, ZQ PEARSON, J BADER, SD AF QIU, ZQ PEARSON, J BADER, SD TI 2-DIMENSIONAL ISING TRANSITION OF EPITAXIAL FE FILMS GROWN ON AG(100) SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC PHASE-TRANSITION; SPIN-POLARIZED PHOTOEMISSION; ULTRATHIN; OSCILLATIONS; MONOLAYERS; AG(001); PERIOD; MODEL; IRON AB Fe(100) films and wedges between 2 and 4 monolayers thick were grown onto a Ag(100) single-crystal substrate. High- and low-energy electron-diffraction observations confirm the epitaxy. The magnetic phase transition near the Curie temperature T(C) was investigated in situ by means of the surface magneto-optic Kerr effect. The temperature dependence of the magnetization follows a universal power law of M(T) is-proportional-to (1 - T/T(C))beta(c) with an effective value of beta(c) almost-equal-to 1/8(0.124+/-0.002), which indicates that the phase transition is two-dimensional Ising class. This and the observed perpendicular easy axes are attributed to the surface magnetic anisotropy. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RI Bader, Samuel/A-2995-2013; Qiu, Zi Qiang/O-4421-2016 OI Qiu, Zi Qiang/0000-0003-0680-0714 NR 25 TC 42 Z9 42 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 APR 1 PY 1994 VL 49 IS 13 BP 8797 EP 8801 DI 10.1103/PhysRevB.49.8797 PG 5 WC Physics, Condensed Matter SC Physics GA NG117 UT WOS:A1994NG11700031 ER PT J AU VAKNIN, D ZARESTKY, JL JOHNSTON, DC SCHIRBER, JE FISK, Z AF VAKNIN, D ZARESTKY, JL JOHNSTON, DC SCHIRBER, JE FISK, Z TI PHASE-SEPARATION TO ANTIFERROMAGNETIC AND SUPERCONDUCTING DOMAINS IN OXYGEN-RICH SINGLE-CRYSTAL LA2CUO4+X - MAGNETIC AND STRUCTURAL NEUTRON-DIFFRACTION STUDIES SO PHYSICAL REVIEW B LA English DT Article ID LA-139 NMR; SUSCEPTIBILITY; NQR AB We report on magnetic and structural neutron-diffraction studies of single-crystal La2CuO4+x versus temperature. The low-temperature diffraction data are consistent with the coexistence of two structurally related phases: nearly stoichiometric, antiferromagnetic (AF) domains, with average domain diameter approximately 500 angstrom in the CuO2 plane, and oxygen-rich, metallic, and superconducting domains. The ordered magnetic moment in the AF domains does not saturate at 10 K, and is on average, mu = (0.3 +/- 0.05)mu(B)/Cu atom. The phase-separation transition to these two phases occurs at T(PS) = 260 +/- 5 K, which is about 15 K higher than the Neel temperature, T(N) = 245 +/- 3 K. The value of T(PS) is identical within the errors with that (259 +/- 2 K) found previously from specific-heat. measurements on the same crystal. The structural properties of the single crystal are discussed and compared to those of polycrystalline oxygen-rich La2CuO4+x. C1 IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP VAKNIN, D (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. RI Vaknin, David/B-3302-2009 OI Vaknin, David/0000-0002-0899-9248 NR 30 TC 35 Z9 35 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 APR 1 PY 1994 VL 49 IS 13 BP 9057 EP 9063 DI 10.1103/PhysRevB.49.9057 PG 7 WC Physics, Condensed Matter SC Physics GA NG117 UT WOS:A1994NG11700055 ER PT J AU LACERDA, A RODRIGUEZ, JP HUNDLEY, MF FISK, Z CANFIELD, PC THOMPSON, JD CHEONG, SW AF LACERDA, A RODRIGUEZ, JP HUNDLEY, MF FISK, Z CANFIELD, PC THOMPSON, JD CHEONG, SW TI MAGNETORESISTANCE IN THE NORMAL-STATE OF LA1.925SR0.075CUO4+DELTA SO PHYSICAL REVIEW B LA English DT Article ID LA2-XSRXCUO4 AB The in-plane magnetoresistance of a high-quality single crystal of La1.925Sr0.075CuO4+delta has been measured in both the high-symmetry transverse geometry and in the longitudinal geometry. In both orientations, the magnetoresistance is positive and shows conventional weak-field behavior. The measured longitudinal magnetoresistance, however, is found to be almost an order of magnitude smaller than the measured transverse magnetoresistance. A semiphenomenological theory based on anisotropic scattering from hypothesized hole-pocket Fermi surfaces is introduced, which can account for the latter positive effect, as well as for known Hall-effect measurements. We predict that, in the limit corresponding to perfectly coherent in-plane hole motion along (pi,pi), there should be no saturation effect in the high-symmetry transverse magnetoresistance. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. CALIF STATE UNIV LOS ANGELES,DEPT PHYS & ASTRON,LOS ANGELES,CA 90032. RP LACERDA, A (reprint author), LOS ALAMOS NATL LAB,PULSED FIELD FACIL,NATL HIGH MAGNET FIELD LAB,LOS ALAMOS,NM 87545, USA. RI Canfield, Paul/H-2698-2014 NR 11 TC 17 Z9 17 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1994 VL 49 IS 13 BP 9097 EP 9102 DI 10.1103/PhysRevB.49.9097 PG 6 WC Physics, Condensed Matter SC Physics GA NG117 UT WOS:A1994NG11700061 ER PT J AU NICHOLS, DH DABROWSKI, B WELP, U CROW, JE AF NICHOLS, DH DABROWSKI, B WELP, U CROW, JE TI MAGNETIC-ANISOTROPY IN SINGLE-CRYSTAL RARE-EARTH-DOPED RBA2CU4O8 (R=Y, DY, GD, HO, ER, TM, YB) SO PHYSICAL REVIEW B LA English DT Article ID FIELD; SUPERCONDUCTORS AB We measured magnetic susceptibility of single-crystal rare-earth-doped RBa2Cu4O8 (where R = Y, Dy, Gd, Ho, Er, Tm, Yb) in the normal state along the three principal axes. The anisotropy measured fits well to calculated values obtained from crystal electric field (CEF) analysis. From our results we developed a general scaling relation for the CEF parameters across the rare-earth series. C1 NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP NICHOLS, DH (reprint author), FLORIDA STATE UNIV,NATL HIGH MAGNET FIELD LAB,TALLAHASSEE,FL 32306, USA. NR 18 TC 7 Z9 7 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 APR 1 PY 1994 VL 49 IS 13 BP 9150 EP 9156 DI 10.1103/PhysRevB.49.9150 PG 7 WC Physics, Condensed Matter SC Physics GA NG117 UT WOS:A1994NG11700067 ER PT J AU EMIN, D AF EMIN, D TI PHONON-MEDIATED ATTRACTION BETWEEN LARGE BIPOLARONS - CONDENSATION TO A LIQUID SO PHYSICAL REVIEW B LA English DT Article ID PHASE-SEPARATION; TC; TEMPERATURE; SUPERCONDUCTIVITY; TRANSPORT; CARRIERS; YBA2CU3O7-DELTA; LA2-XSRXCUO4; POLARON AB The self-trapped carriers of large (multisite) bipolarons redistribute themselves among the sites of their molecular orbitals as their self-trapping potential wells are altered by changing atomic positions. Through this polarizability, large bipolarons reduce the phonon frequencies. The dependence of the lowering of the zero-point vibrational energy on the spatial distribution of large bipolarons produces an intermediate-ranged phonon-mediated attraction between large bipolarons that is comparable to a phonon energy. Coulomb repulsions that oppose the phonon-mediated attractions tend to be suppressed by the large static dielectric constants associated with large-bipolaron formation. However, a strong short-range repulsion between bipolarons, analogous to the hard-core repulsion between helium atoms, persists. With the dominance of the medium-range phonon-mediated attraction and the short-range repulsion, large bipolarons can condense into a liquid. The bipolaronic liquid might be the condensed fluid phase that has been suggested as a precursor to superconductivity in cuprates. RP SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. NR 36 TC 26 Z9 26 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1994 VL 49 IS 13 BP 9157 EP 9167 DI 10.1103/PhysRevB.49.9157 PG 11 WC Physics, Condensed Matter SC Physics GA NG117 UT WOS:A1994NG11700068 ER PT J AU CRAWFORD, MK SUBRAMANIAN, MA HARLOW, RL FERNANDEZBACA, JA WANG, ZR JOHNSTON, DC AF CRAWFORD, MK SUBRAMANIAN, MA HARLOW, RL FERNANDEZBACA, JA WANG, ZR JOHNSTON, DC TI STRUCTURAL AND MAGNETIC STUDIES OF SR2IRO4 SO PHYSICAL REVIEW B LA English DT Note AB The discovery of high-temperature superconductivity in doped copper oxides, which in their insulating forms are nearly ideal two-dimensional spin-1/2 Heisenberg antiferromagnets, has stimulated great interest in finding additional examples of such magnetic systems. We find that Sr2IrO4, which has the K2NiF4 structure and should have a 5d5 low-spin (S = 1/2) electronic configuration, develops a ferromagnetic moment near 250 K. The small size of the remanent moment (10(-2)mu(B)), and our structural studies, however, imply that this is weak ferromagnetism which appears at the Neel temperature due to a Dzyaloshinsky-Moriya interaction, in a manner analogous to that seen in La2CuO4. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP CRAWFORD, MK (reprint author), DUPONT CO INC,WILMINGTON,DE 19880, USA. RI Fernandez-Baca, Jaime/C-3984-2014 OI Fernandez-Baca, Jaime/0000-0001-9080-5096 NR 18 TC 210 Z9 212 U1 10 U2 128 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 APR 1 PY 1994 VL 49 IS 13 BP 9198 EP 9201 DI 10.1103/PhysRevB.49.9198 PG 4 WC Physics, Condensed Matter SC Physics GA NG117 UT WOS:A1994NG11700076 ER PT J AU EMERSON, JP FISHER, RA PHILLIPS, NE WRIGHT, DA MCCARRON, EM AF EMERSON, JP FISHER, RA PHILLIPS, NE WRIGHT, DA MCCARRON, EM TI MAGNETIC-FIELD DEPENDENCE OF THE SPECIFIC-HEAT OF YBA2CU3O7 SO PHYSICAL REVIEW B LA English DT Note ID LINEAR TERM; ORIGIN AB Specific-heat measurements on YBa2Cu3O7 in magnetic fields to 7 T have shown the presence of Schottky anomalies with the field and temperature dependence expected for a fixed concentration of Cu2+ magnetic moments. The field-dependent part of the specific heat also includes a temperature-proportional contribution that is approximately proportional to field. These results are qualitatively different from those reported recently from another laboratory. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. DUPONT CO INC,DEPT CENT RES & DEV,EXPT STN,WILMINGTON,DE 19880. RP EMERSON, JP (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 12 TC 14 Z9 15 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1994 VL 49 IS 13 BP 9256 EP 9259 DI 10.1103/PhysRevB.49.9256 PG 4 WC Physics, Condensed Matter SC Physics GA NG117 UT WOS:A1994NG11700091 ER PT J AU RUBINI, S DIMITROPOULOS, C BORSA, F AF RUBINI, S DIMITROPOULOS, C BORSA, F TI NMR INVESTIGATION OF THE MARTENSITIC-TRANSFORMATION IN FINE PARTICLES OF NI-AL ALLOYS SO PHYSICAL REVIEW B LA English DT Article ID THERMOELASTICITY; PSEUDOELASTICITY; KINETICS AB Al-27 NMR results are presented for three Ni-Al alloys with composition 62%, 62.5%, and 63% Ni undergoing a thermoelastic martensitic phase transformation below room temperature. By a method of analysis of the NMR data recently developed by us [Phys. Rev. B 46, 10 563 (1992)], we measure the growth of the volume fraction of martensite on cooling for samples having different particle sizes (1 mm-50 mum). We observe an incomplete transformation in the fine particle sample (less than 150 mum). The effect can be explained as due to the presence of austenite trapped in intramartensitic regions near the center of the particles. C1 UNIV PAVIA,DIPARTIMENTO FIS ALESSANDRO VOLTA,I-27100 PAVIA,ITALY. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP RUBINI, S (reprint author), ECOLE POLYTECH FED LAUSANNE,INST PHYS EXPTL,CH-1015 LAUSANNE,SWITZERLAND. RI Rubini, Silvia/C-8369-2012 OI Rubini, Silvia/0000-0001-5215-2223 NR 13 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1994 VL 49 IS 14 BP 9331 EP 9335 DI 10.1103/PhysRevB.49.9331 PG 5 WC Physics, Condensed Matter SC Physics GA NG486 UT WOS:A1994NG48600006 ER PT J AU SODERLIND, P AHUJA, R ERIKSSON, O JOHANSSON, B WILLS, JM AF SODERLIND, P AHUJA, R ERIKSSON, O JOHANSSON, B WILLS, JM TI THEORETICAL PREDICTIONS OF STRUCTURAL PHASE-TRANSITIONS IN CR, MO, AND W SO PHYSICAL REVIEW B LA English DT Article ID PRESSURE; BAND AB Theoretical predictions, based on local-density calculations, of pressure-induced structural phase transitions in Cr, Mo, and W are reported. Phase changes at high compressions are found for all three metals. As a function of compression the structural sequence bcc --> hcp --> fcc --> bcc is found for Cr and Mo. For W, the structural sequence bcc --> hcp --> fcc was found. Calculations for W were performed down to about 30% of the. ambient volume, whereas Cr and Mo were studied at compressions down to about 10% of the experimental volume. The structural sequence bcc --> hcp --> fcc for Cr, Mo, and W can be understood from band-filling arguments, while the fact that the bcc crystal structure, found at ambient conditions, becomes stable at extreme compression (at volumes typically 10% of the experimental volume) for Cr and Mo is explained by the gradually increased p-d overlap and hybridization in these elements under compression. C1 LOS ALAMOS NATL LAB, CTR MAT SCI, LOS ALAMOS, NM 87545 USA. LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. RP UNIV UPPSALA, DEPT PHYS, CONDENSED MATTER THEORY GRP, BOX 530, S-75105 UPPSALA, SWEDEN. RI Eriksson, Olle/E-3265-2014 OI Eriksson, Olle/0000-0001-5111-1374 NR 26 TC 32 Z9 32 U1 0 U2 7 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1994 VL 49 IS 14 BP 9365 EP 9371 DI 10.1103/PhysRevB.49.9365 PG 7 WC Physics, Condensed Matter SC Physics GA NG486 UT WOS:A1994NG48600011 ER PT J AU SALKOLA, MI AF SALKOLA, MI TI INTERMOLECULAR POLARON AND BIPOLARON TUNNELING IN C-60 SO PHYSICAL REVIEW B LA English DT Article ID ALKALI-METAL; DOPED C-60; SUPERCONDUCTIVITY; FULLERENES; BANDS; A3C60; C60 AB Intermolecular tunneling of polarons and bipolarons is studied in C60 in the limit of weak electron-electron interactions. It is shown that the effective mass of the polaron is renormalized only weakly by intramolecular electron-phonon interactions. However, using the adiabatic approximation, it is found that the Franck-Condon effect would essentially localize the bipolaron on a single molecule in the limit of narrow conduction bandwidth. Indeed, the effective mass of the bipolaron would be increased by more than a factor of 10(3). Combined with the observed metallic behavior of doped C60, this suggests that either the electronic correlation effects are important or that the conduction band is not too narrow in order to suppress the artificially large mass renormalization or to inhibit the bipolaron formation altogether. RP SALKOLA, MI (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 20 TC 6 Z9 6 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 APR 1 PY 1994 VL 49 IS 14 BP 9533 EP 9538 DI 10.1103/PhysRevB.49.9533 PG 6 WC Physics, Condensed Matter SC Physics GA NG486 UT WOS:A1994NG48600027 ER PT J AU SACHAN, V BUTTREY, DJ TRANQUADA, JM SHIRANE, G AF SACHAN, V BUTTREY, DJ TRANQUADA, JM SHIRANE, G TI NEUTRON-SCATTERING STUDY OF MAGNETISM IN ND2BANIO5 SO PHYSICAL REVIEW B LA English DT Article ID CRYSTAL-STRUCTURE; OXIDES; ER2BANIO5 AB Single crystals of the linear chain phase Nd2BaNiO5+delta [delta = 0.005(1)] have been prepared and the magnetism studied by neutron scattering. The Ni-O chain direction is along the short axis a. Long-range antiferromagnetic order sets in below T(N) = 48 K with Nd and Ni moments parallel to [001]. The Nd2BaNiO5 magnetic cell is doubled along a and c relative to the chemical unit cell. The magnitude of the moments at 4.9 K is 2.7(2) and 1.2(1)mu(B) for Nd and Ni, respectively. C1 UNIV DELAWARE,DEPT CHEM ENGN,NEWARK,DE 19716. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP SACHAN, V (reprint author), UNIV DELAWARE,MAT SCI PROGRAM,NEWARK,DE 19716, USA. RI Tranquada, John/A-9832-2009 OI Tranquada, John/0000-0003-4984-8857 NR 16 TC 37 Z9 38 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 APR 1 PY 1994 VL 49 IS 14 BP 9658 EP 9662 DI 10.1103/PhysRevB.49.9658 PG 5 WC Physics, Condensed Matter SC Physics GA NG486 UT WOS:A1994NG48600042 ER PT J AU ZELDOV, E CLEM, JR MCELFRESH, M DARWIN, M AF ZELDOV, E CLEM, JR MCELFRESH, M DARWIN, M TI MAGNETIZATION AND TRANSPORT CURRENTS IN THIN SUPERCONDUCTING FILMS SO PHYSICAL REVIEW B LA English DT Article ID DISK-SHAPED SUPERCONDUCTORS; II SUPERCONDUCTORS; CURRENT-DENSITY; CRITICAL STATE; ANISOTROPY AB The critical-state behavior of an infinitely long type-II superconducting thin-film strip is theoretically analyzed for an arbitrary sequence of applied transport currents and perpendicular magnetic fields. Included are solutions for applied field only, transport current only, transport current applied to a sample initially in the remanent critical state, ac applied field, ac transport current, and simultaneously applied field and transport current. The results are compared side by side with corresponding solutions for the more familiar slab geometry; there are striking differences in behavior. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907. RP ZELDOV, E (reprint author), WEIZMANN INST SCI,DEPT PHYS,IL-76100 REHOVOT,ISRAEL. RI Zeldov, Eli/K-1546-2012 OI Zeldov, Eli/0000-0002-8200-4974 NR 35 TC 506 Z9 506 U1 1 U2 27 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1994 VL 49 IS 14 BP 9802 EP 9822 DI 10.1103/PhysRevB.49.9802 PG 21 WC Physics, Condensed Matter SC Physics GA NG486 UT WOS:A1994NG48600058 ER PT J AU MANOSA, L JURADO, M PLANES, A ZARESTKY, J LOGRASSO, T STASSIS, C AF MANOSA, L JURADO, M PLANES, A ZARESTKY, J LOGRASSO, T STASSIS, C TI ELASTIC-CONSTANTS OF BCC CU-AL-NI ALLOYS SO PHYSICAL REVIEW B LA English DT Note ID MARTENSITIC-TRANSFORMATION; PHASE; TRANSITION AB We have measured the adiabatic elastic constants of two Cu-Al-Ni martensitic alloys using ultrasonic methods and we have compared the results to recent neutron-scattering experiments. It is shown that the elastic behavior of Cu-Al-Ni alloys follows the same trends exhibited by other Cu-based alloys; in particular, the TA2 long-wavelength acoustic modes are softer than all other modes. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP MANOSA, L (reprint author), UNIV BARCELONA,FAC FIS,DEPT ESTRUCTURA & CONSTITUENTS MAT,DIAGONAL 647,E-08028 BARCELONA,SPAIN. RI Manosa, Lluis/D-8579-2014; Planes, Antoni/O-1904-2015 OI Manosa, Lluis/0000-0002-1182-2670; Planes, Antoni/0000-0001-5213-5714 NR 23 TC 29 Z9 29 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 APR 1 PY 1994 VL 49 IS 14 BP 9969 EP 9972 DI 10.1103/PhysRevB.49.9969 PG 4 WC Physics, Condensed Matter SC Physics GA NG486 UT WOS:A1994NG48600079 ER PT J AU LIN, SW JIN, C ZHANG, H KETTERSON, JB LEE, DM HINKS, DG LEVY, M SARMA, BK AF LIN, SW JIN, C ZHANG, H KETTERSON, JB LEE, DM HINKS, DG LEVY, M SARMA, BK TI SUPERCONDUCTING PHASE-DIAGRAM OF UPT(3) FOR FIELDS ALONG A NONSYMMETRIC ORIENTATION FROM ULTRASONIC MEASUREMENTS SO PHYSICAL REVIEW B LA English DT Note ID MAGNETIC-FIELD; UNCONVENTIONAL SUPERCONDUCTOR; DOUBLE TRANSITION; UPT3; SYMMETRY AB A H-T superconducting phase diagram is presented for UPt3 Which is obtained from ultrasonic velocity measurements with the field at 45-degrees to the c axis. The implications of the phase diagram on various theoretical models are discussed. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. CORNELL UNIV,ATOM & SOLID STATE PHYS LAB,ITHACA,NY 14853. UNIV WISCONSIN,DEPT PHYS,MILWAUKEE,WI 53201. RP LIN, SW (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. RI Ketterson, John/B-7234-2009 NR 24 TC 12 Z9 12 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 APR 1 PY 1994 VL 49 IS 14 BP 10001 EP 10004 DI 10.1103/PhysRevB.49.10001 PG 4 WC Physics, Condensed Matter SC Physics GA NG486 UT WOS:A1994NG48600087 ER PT J AU HELMER, RG REICH, CW AF HELMER, RG REICH, CW TI AN EXCITED-STATE OF TH-229 AT 3.5 EV SO PHYSICAL REVIEW C LA English DT Article ID GAMMA-RAY ENERGIES; DECAY; STANDARDS AB It has been known for many years that the first excited state of Th-229 lies close to the ground state. Originally this energy was given as < 0.1 keV; later, the authors reported a value of -1 +/- 4 eV. In an attempt to improve the value for this level energy, we have remeasured the energies of a number of gamma rays from U-233 whose positions in the Th-229 level scheme can be used to establish it. Compared with our earlier study, we have considered more gamma rays in Th-229, used more well-measured energy calibration and reference lines, used more detectors, used detectors with better low-energy resolution, more closely matched the counting rates in the gamma-ray peaks whose relative energy is measured, and specifically considered certain systematic errors. More than 111 gamma-ray spectra have been measured. From this large set of measurements we have deduced a value of 3.5 +/- 1.0 eV for the energy of this level. RP HELMER, RG (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 24 TC 104 Z9 108 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD APR PY 1994 VL 49 IS 4 BP 1845 EP 1858 DI 10.1103/PhysRevC.49.1845 PG 14 WC Physics, Nuclear SC Physics GA NG677 UT WOS:A1994NG67700019 ER EF