FN Thomson Reuters Web of Science™ VR 1.0 PT J AU GAILLARD, MK JAIN, V AF GAILLARD, MK JAIN, V TI ONE-LOOP EFFECTIVE ACTION IN THE CASE OF NONCANONICAL GAUGE KINETIC-ENERGY SO PHYSICAL REVIEW D LA English DT Article ID SIGMA-MODELS; DIMENSIONAL REDUCTION; TARGET SPACE; COUPLINGS; SUPERGRAVITY; GRAVITY AB We calculate the one-loop effective action for a four-dimensional bosonic model when the gauge kinetic energy and F-F-dual terms are coupled to the scalar fields. The simple form of the coupling we choose is particularly relevant to string-inspired supergravity models. C1 LAWRENCE BERKELEY LAB,DIV PHYS,BERKELEY,CA 94720. MAX PLANCK INST PHYS & ASTROPHYS,W-8000 MUNICH 40,GERMANY. RP GAILLARD, MK (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 27 TC 7 Z9 7 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG 15 PY 1992 VL 46 IS 4 BP 1786 EP 1793 DI 10.1103/PhysRevD.46.1786 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JH749 UT WOS:A1992JH74900048 ER PT J AU BRAATEN, E PISARSKI, RD AF BRAATEN, E PISARSKI, RD TI CALCULATION OF THE QUARK DAMPING RATE IN HOT QCD SO PHYSICAL REVIEW D LA English DT Article ID HARD THERMAL LOOPS; GAUGE-THEORIES; FINITE TEMPERATURE; GLUON PLASMA; INVARIANCE AB We present a complete calculation of the quark damping rate at zero momentum, to leading order in the QCD coupling constant g at a nonzero temperature T. All terms of leading order in g are included by the resummation of an infinite subset of higher-loop diagrams. At zero momentum the damping rates for the quark and the plasmino (a collective mode with opposite chirality and/or helicity) are equal: for three flavors of massless quarks, the result is gamma congruent-to 0.151g2T. We also examine the recent controversy over the gauge dependence of the quark damping rate, and show how it is resolved when dimensional regularization is used as an infrared regulator of mass singularities. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP BRAATEN, E (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. NR 23 TC 114 Z9 114 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG 15 PY 1992 VL 46 IS 4 BP 1829 EP 1834 DI 10.1103/PhysRevD.46.1829 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JH749 UT WOS:A1992JH74900053 ER PT J AU MENON, ESK DEFONTAINE, D AF MENON, ESK DEFONTAINE, D TI EFFECTS OF NONLINEAR DIFFUSION ON DIFFRACTION FROM BINARY MULTILAYERS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID FILMS C1 LAWRENCE BERKELEY LAB,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. NR 11 TC 4 Z9 4 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 AUG 15 PY 1992 VL 27 IS 4 BP 395 EP 400 DI 10.1016/0956-716X(92)90200-X PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JE545 UT WOS:A1992JE54500003 ER PT J AU HONG, SI GRAY, GT LEWANDOWSKI, JJ AF HONG, SI GRAY, GT LEWANDOWSKI, JJ TI MICROSTRUCTURAL EVOLUTION IN AN AL-ZN-MG-CU ALLOY-20 VOL PERCENT SIC COMPOSITE SHOCK-LOADED TO 5 GPA SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article C1 CASE WESTERN RESERVE UNIV,DEPT MAT SCI & ENGN,CLEVELAND,OH 44106. RP HONG, SI (reprint author), LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545, USA. NR 9 TC 12 Z9 13 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD AUG 15 PY 1992 VL 27 IS 4 BP 431 EP 436 DI 10.1016/0956-716X(92)90206-T PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JE545 UT WOS:A1992JE54500009 ER PT J AU CHEN, SP AF CHEN, SP TI THEORETICAL-STUDIES OF ULTRATHIN FILM-INDUCED FACETING ON W(111) SURFACES SO SURFACE SCIENCE LA English DT Article ID EMBEDDED-ATOM METHOD; GRAIN-BOUNDARIES; METALLIC SYSTEM; ALLOY FORMATION; BILAYER GROWTH; NI3AL; BORON; NI; AL AB We have used local volume (or EAM) potentials to study the pyramidal faceting (or reconstruction) of a W(111) surface induced by face center cubic (fcc) metals Pd, Pt, Au, and a body center cubic (bcc) metal Mo. We found that the surface-energy differences of (211) and (111) surfaces of bcc W increases as one or few monolayers of Pd, Pt, Au, and Mo films are deposited. We found that the lateral relaxation which is allowed on the (211) surface further increases the surface energy anisotropy as the thickness of the fcc metal film increases. Our calculated results are consistent with the argument that the surface energy anisotropy is the driving force for the faceting, but do not rule out three-dimensional (3D) island growth as another possible mechanism for the (211) faceting. We also found that there is a possible bilayer growth mode in W(211) surfaces with Pt and Pd films. RP CHEN, SP (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 51 TC 55 Z9 57 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD AUG 15 PY 1992 VL 274 IS 3 BP L619 EP L626 DI 10.1016/0039-6028(92)90835-T PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JH828 UT WOS:A1992JH82800009 ER PT J AU KEPLER, RG SEAGER, CH SOOS, ZG MCWILLIAMS, PCM AF KEPLER, RG SEAGER, CH SOOS, ZG MCWILLIAMS, PCM TI EXCITON FUSION AND CHARGE-CARRIER GENERATION IN POLY(DI-NORMAL-HEXYLSILANE) SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT CONF ON OPTICAL PROBES OF CONJUGATED POLYMERS CY AUG 22-25, 1991 CL SNOWBIRD, UT ID CONJUGATED POLYMERS; 2-PHOTON SPECTRA; POLYSILANES; FILMS; EXCITATIONS; ABSORPTION; TRANSPORT AB We have observed charge-carrier generation in the long-wavelength tail of the first electronic transition in poly(di-n-hexylsilane), which varies as the square of the intensity of the incident light and as the absorption coefficient raised to a power somewhat greater than two. We discuss two mechanisms involving exciton fusion for generating carriers. C1 PRINCETON UNIV,DEPT CHEM,PRINCETON,NJ 08544. RP KEPLER, RG (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 24 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD AUG 15 PY 1992 VL 50 IS 1-3 BP 387 EP 394 DI 10.1016/0379-6779(92)90191-K PG 8 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA JT306 UT WOS:A1992JT30600002 ER PT J AU NI, QX SWANSON, LS LANE, PA SHINAR, J DING, YW IJADIMAGHSOODI, S BARTON, TJ AF NI, QX SWANSON, LS LANE, PA SHINAR, J DING, YW IJADIMAGHSOODI, S BARTON, TJ TI CONDUCTIVITY, OPTICAL-ABSORPTION, PHOTOLUMINESCENCE, AND X-BAND OPTICALLY DETECTED MAGNETIC-RESONANCE OF NOVEL POLY(2,5-DIBUTOXYPARAPHENYLENEACETYLENE) (PDBOPA) SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT CONF ON OPTICAL PROBES OF CONJUGATED POLYMERS CY AUG 22-25, 1991 CL SNOWBIRD, UT ID STRETCHED POLYTHIOPHENE FILMS; CONJUGATED POLYMERS; ELECTRONIC-PROPERTIES; POLY(3-HEXYLTHIOPHENE); LUMINESCENCE; ANISOTROPIES; POLARONS; EXCITON; DIODES AB The optical properties of novel PDBOPA (average molecular weight almost-equal-to 48 000) are described and discussed. Exposure to 2 vapor at almost-equal-to 80-degrees-C increases the conductivity to almost-equal-to 5 X 10(-3) S/cm, but the 12 rapidly evolves from the film at room temperature. The absorption onsets at 2.53 eV and peaks at 2.81 eV. The 2.71 eV-excited photoluminescence (PL) peaks at almost-equal-to 2.0 eV in films and solutions. In all cases, it is very intense and largely structureless. This contrasts with the clear vibronic structure of the PL of poly(3-alkylthiophene) (P3AT) and poly(2,5-dialkoxyparaphenylenevinylene) (PDOPV) films and blends. As in P3AT and PDOPV, three PL-enhancing optically detected magnetic resonance (ODMR) features are observed: (i) a strong narrow (almost-equal-to 15 G wide) resonance at g = 2.0025, attributed to intrachain polaron recombination; (ii) a almost-equal-to 1.0 kG wide triplet powder pattern around g approximately 2, and (iii) the DELTAm(S) = 2 transitions of these excitons at g congruent-to 4.07. The results are discussed in relation to conformational defects resulting from the near cylindrical symmetry of the backbone acetylene units. C1 US DOE,AMES LAB,AMES,IA 50011. RP NI, QX (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011, USA. NR 33 TC 17 Z9 17 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD AUG 15 PY 1992 VL 50 IS 1-3 BP 447 EP 452 DI 10.1016/0379-6779(92)90198-R PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA JT306 UT WOS:A1992JT30600009 ER PT J AU VARDENY, ZV WEI, X HAN, SG WONG, KS ZHENG, LX KANNER, GS SHINAR, J PANG, Y IJADIMAGHSOODI, S BARTON, TJ GRIGORAS, S PARBHOO, B AF VARDENY, ZV WEI, X HAN, SG WONG, KS ZHENG, LX KANNER, GS SHINAR, J PANG, Y IJADIMAGHSOODI, S BARTON, TJ GRIGORAS, S PARBHOO, B TI OPTICAL PROBES OF POLYDIETHYNYLSILANES SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT CONF ON OPTICAL PROBES OF CONJUGATED POLYMERS CY AUG 22-25, 1991 CL SNOWBIRD, UT ID POLYACETYLENE; EXCITATIONS; POLYMERS; DYNAMICS AB We have applied a variety of optical probe techniques for studying the ground-state properties, photoexcitations, and optical nonlinearities of the novel class pi-conjugated polymers incorporating Si (or Ge), the polydiethynylsilanes (PDES): [(HC=C)2SiR2]x, where R=alkyl, phenyl, etc. Our measurements imply that the PDES backbone structure consists of units of four-membered rings alternately connected to CH and SiR2 units; thus it can be regarded as an almost degenerate ground state (AB)x conducting polymer with a band gap at 2 eV. The PDES are therefore the second class of conducting polymers that can support soliton excitations. Using the photomodulation spectroscopy technique, we have found in PDES photogeneration of charged solitons similar to that in trans-(CH)x, as predicted by theory. However, due to the short average conjugation length in PDES films, the soliton energy levels are split by end-effects confinement. We have also found at 2 eV chi(3) = 3 X 10(-9) esu, which decays in a record time of 135 fs, followed by a slower decay component of 750 fs, without a long tail even at higher laser intensities. C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. DOW CORNING CORP,MIDLAND,MI 48686. RP VARDENY, ZV (reprint author), UNIV UTAH,DEPT PHYS,SALT LAKE CITY,UT 84112, USA. NR 15 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD AUG 15 PY 1992 VL 50 IS 1-3 BP 453 EP 459 DI 10.1016/0379-6779(92)90199-S PG 7 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA JT306 UT WOS:A1992JT30600010 ER PT J AU SWANSON, LS LANE, PA SHINAR, J YOSHINO, K WUDL, F AF SWANSON, LS LANE, PA SHINAR, J YOSHINO, K WUDL, F TI TRIPLET POLARONIC EXCITONS IN CONDUCTING POLYMERS - AN X-BAND OPTICALLY DETECTED MAGNETIC-RESONANCE (ODMR) STUDY SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT CONF ON OPTICAL PROBES OF CONJUGATED POLYMERS CY AUG 22-25, 1991 CL SNOWBIRD, UT ID STRETCHED POLYTHIOPHENE FILMS; CONJUGATED POLYMERS; PHOTOEXCITED STATES; POLY(3-HEXYLTHIOPHENE); ANISOTROPIES; LUMINESCENCE; SPECTRA; SOLIDS AB The g approximately 2, approximately 1 kG wide photoluminescence(PL)-enhancing triplet powder pattern and g congruent-to 4.07 X-band ODMR of poly(3-alkylthiophene) (P3AT), poly(paraphenylenevinylene) (PPV), and its 2,5-dihexoxy derivative (PDHOPV) are described and discussed. The resonances are attributed to the DELTAm(s) = 1 and 2 transitions, respectively, of triplet polaronic excitons. The zero-field splitting parameters of P3AT are (i) D congruent-to 560 G and E congruent-to 0 below 50 K, but (ii) D congruent-to 470 G and E congruent-to D/3 above 50 K. PPV and PDHOPV exhibit the latter exciton only. These values of D and E indicate that the spatial extent of the excitons is similar to that of the phenyl or thiophene rings. The E congruent-to 0 cylindrically symmetric exciton in P3AT is suspected to result from shallow traps on the thiophene rings. The other is tentatively assigned to free intrachain excitons. Since various studies indicate that the triplet levels are considerably lower than the singlet, magnetic resonance enhancement of radiative decay from singlets generated during triplet-triplet collisions is discussed. The effects of thermal cycling of PDHOPV, which results in a strong approximately 600 G wide 'dip' at g approximately 2, possibly due to a PL-quenching resonance, are also discussed. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT ELECT ENGN,AMES,IA 50011. UNIV CALIF SANTA BARBARA,INST POLYMERS & ORGAN SOLIDS,SANTA BARBARA,CA 93106. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. RP SWANSON, LS (reprint author), US DOE,AMES LAB,AMES,IA 50010, USA. NR 29 TC 8 Z9 8 U1 1 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD AUG 15 PY 1992 VL 50 IS 1-3 BP 473 EP 480 DI 10.1016/0379-6779(92)90202-T PG 8 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA JT306 UT WOS:A1992JT30600013 ER PT J AU SWANSON, LS SHINAR, J LANE, PA HESS, BC WUDL, F AF SWANSON, LS SHINAR, J LANE, PA HESS, BC WUDL, F TI OPTICALLY DETECTED MAGNETIC-RESONANCE (ODMR) OF POLARONS AND CHARGE-CONJUGATION SYMMETRY IN CONDUCTING POLYMERS SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT CONF ON OPTICAL PROBES OF CONJUGATED POLYMERS CY AUG 22-25, 1991 CL SNOWBIRD, UT AB The main narrow photoluminescence(PL)-enhancing g = 2.0025 +/- 0.0010 X-band ODMR of poly(3-alkylthiophene) (P3AT) and poly(2,5-dialkoxyparaphenylenevinylene) (PDOPV) films, solutions, and blends is described and discussed. The resonances all closely match a sum of narrow and broad Gaussians. In P3AT the narrow Gaussian saturates at a lower power than the broad Gaussian. While this ODMR is believed to result from intrachain 'distant pair' polaron recombination, the assignment of each Gaussian to the proper polaron is undecided. The g-values of the two Gaussians are nearly identical in PDOPV, apparently reflecting a very high degree of charge-conjugation symmetry (CCS). They are, however, quite distinct (g = 2.0032, 2.0019, respectively) in P3AT, possibly due to the sulphur heteroatom on the thiophene rings. The ramifications of this CCS violation for the PL quantum yield are discussed. In all cases, the spectral dependence of the narrow resonance is similar to the PL spectrum, indicating that the polaron levels are close to the band edges and to the levels of the (presumably) short-lived geminate singlet excitons. The sensitivity of the ODMR intensity to sample processing suggests that it may possibly be affected by an unidentified native, possibly conformational, defect. The decay modes competing with polaron recombination are also discussed. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV CALIF SANTA BARBARA,INST POLYMERS & ORGAN SOLIDS,SANTA BARBARA,CA 93106. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. RP SWANSON, LS (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 13 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD AUG 15 PY 1992 VL 50 IS 1-3 BP 481 EP 489 DI 10.1016/0379-6779(92)90203-U PG 9 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA JT306 UT WOS:A1992JT30600014 ER PT J AU KAWABE, Y JARKA, F PEYGHAMBARIAN, N GUO, D MAZUMDAR, S DIXIT, SN KAJZAR, F AF KAWABE, Y JARKA, F PEYGHAMBARIAN, N GUO, D MAZUMDAR, S DIXIT, SN KAJZAR, F TI ELECTROABSORPTION IN A POLYDIACETYLENE SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT CONF ON OPTICAL PROBES OF CONJUGATED POLYMERS CY AUG 22-25, 1991 CL SNOWBIRD, UT ID CONJUGATED POLYMERS; SINGLE-CRYSTALS; ELECTROREFLECTANCE; EXCITONS; SPECTRA; STATES AB The electro-absorption in a DCH-polydiacetylene has been investigated both experimentally and theoretically. In addition to the red Stark shift of the exciton, a significant feature in the difference spectrum is observed at a higher energy. Within an interacting electron model (extended Peierls-Hubbard model), the roles played by the dipole-allowed one-photon states and the dipole-forbidden two-photon states are studied in detail. It is found that the high-energy signals in the difference spectrum are due to the strong field-induced mixing of the one-photon state at the edge of a continuum structure, or 'conduction' band' in the language of band theory, with its neighboring two-photon states. Contributions to the electro-absorption from the one- and two-photon states cancel deep within the band. Three-photon resonance due to the band edge is expected in third-harmonic generation (THG) and has been seen in both a polydiacetylene and in polysilanes. C1 UNIV ARIZONA,CTR OPT SCI,TUCSON,AZ 85721. CENS,DEIN,PHYS ELECTR MAT LAB,CEA,IRDI,DLETI,F-91191 GIF SUR YVETTE,FRANCE. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP KAWABE, Y (reprint author), IDEMITSU KOSAN CO LTD,CENT RES LABS,1280 KAMIIZUMI,SODEGAURA,CHIBA 29902,JAPAN. NR 15 TC 2 Z9 2 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD AUG 15 PY 1992 VL 50 IS 1-3 BP 517 EP 523 DI 10.1016/0379-6779(92)90207-Y PG 7 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA JT306 UT WOS:A1992JT30600018 ER PT J AU SINCLAIR, MB MCBRANCH, D HAGLER, TW HEEGER, AJ AF SINCLAIR, MB MCBRANCH, D HAGLER, TW HEEGER, AJ TI SUBPICOSECOND PHOTOINDUCED ABSORPTION IN POLY[2,5-THIENYLENE VINYLENE] AND POLY[3-METHOXY-6-(2-ETHYL-HEXYLOXY) PHENYLENE VINYLENE] SO SYNTHETIC METALS LA English DT Article ID RELAXATION DYNAMICS; POLY(2,5-THIENYLENE VINYLENE); TRANSIENT ABSORPTION; CONDUCTING POLYMERS; POLYACETYLENE; POLYDIACETYLENE; PHOTOEXCITATIONS; SOLITONS; STATES; MODEL AB The photoinduced absorption spectra of the conjugated polymers poly[3-methoxy-6-(2-ethyl-hexyloxy) phenylene vinylene] (MEH-PPV) and poly[2,5-thienylene vinylene] (PTV) have been measured using 100 fs laser pulses and white-light continuum generation. For MEH-PPV, a broad sub-gap absorption, peaking at approximately 1.45 eV, appears within 1 ps of photoexcitation by a 2.05 eV pulse. With increasing time, the induced sub-gap absorption decays and sharpens slightly. These features are tentatively assigned to the photoproduction of triplet excitons. For PTV, excitation at 2.05 eV results in a sub-gap absorption whose maximum is somewhere below the low-energy cut-off of our experimental apparatus (1.3 eV). At early times, induced absorption and bleaching peaks are observed in the vicinity of the principal absorption edge. These features evolve with increasing time, and, by 100 ps, closely resemble the thermal modulation spectrum expected for complete transfer of the pump energy to the lattice due to the nonradiative recombination of the photo excitations. C1 UNIV CALIF SANTA BARBARA, INST POLYMERS & ORGAN SOLIDS, SANTA BARBARA, CA 93106 USA. RP SINCLAIR, MB (reprint author), SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. NR 22 TC 29 Z9 30 U1 0 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD AUG 15 PY 1992 VL 50 IS 1-3 BP 593 EP 602 DI 10.1016/0379-6779(92)90216-6 PG 10 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA JT306 UT WOS:A1992JT30600027 ER PT J AU SHINAR, J SWANSON, LS AF SHINAR, J SWANSON, LS TI OPTICALLY DETECTED MAGNETIC-RESONANCE (ODMR) STUDIES OF CONDUCTING POLYMERS - AN OVERVIEW SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT CONF ON OPTICAL PROBES OF CONJUGATED POLYMERS CY AUG 22-25, 1991 CL SNOWBIRD, UT ID PHOTOEXCITED STATES; LUMINESCENCE; POLY(3-HEXYLTHIOPHENE); POLYTHIOPHENE; DIODES; FILMS AB Recent X-band optically detected magnetic resonance (ODMR) studies of films, solutions, and blends of poly(3-alkylthiophenes) and dialkoxy derivatives of poly(paraphenylenevinylene) and poly(paraphenyleneacetylene) are reviewed and discussed. All films and blends exhibit three similar (but not identical) photoluminescence(PL)-enhancing features: (i) a strong narrow (10-15 G wide) resonance at g = 2.0025 +/- 0.0010; (ii) an approximately 1 kG wide triplet powder pattern around g approximately 2; (iii) a 10-30 G wide peak 30-50 G downfield from hv/(2 x 2.003beta) (at g congruent-to 4.07). The narrow resonance is attributed to intrachain 'distant pair' polaron recombination. Its spectral dependence, which is similar to the PL spectrum, indicates that the polaron levels are close to the band edges. Features (ii) and (iii) are attributed to intrachain triplet polaronic excitons. Their zero-field splitting parameters are consistent with a triplet size comparable to that of the thiophene and phenylene rings. The dependence of the ODMR features on sample history and the role of metastable and stable native defects is also discussed. C1 US DOE,AMES LAB,AMES,IA 50011. RP SHINAR, J (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011, USA. NR 31 TC 7 Z9 7 U1 0 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD AUG 15 PY 1992 VL 50 IS 1-3 BP 621 EP 630 DI 10.1016/0379-6779(92)90219-9 PG 10 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA JT306 UT WOS:A1992JT30600030 ER PT J AU CAMPBELL, DK GAMMEL, JT LIN, HQ LOH, EY AF CAMPBELL, DK GAMMEL, JT LIN, HQ LOH, EY TI TRIPLET-STATES AND OPTICAL ABSORPTIONS IN FINITE POLYENES AND CONJUGATED POLYMERS SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT CONF ON OPTICAL PROBES OF CONJUGATED POLYMERS CY AUG 22-25, 1991 CL SNOWBIRD, UT ID TRANS-POLYACETYLENE; EXCITATIONS AB We study the nature of triplet states in correlated quasi-one-dimensional bands, with emphasis on the half-filled case relevant to conducting polymers. To incorporate both electron-phonon and electron-electron interaction effects, we use a Peierls-extended Hubbard Hamiltonian, which we solve for finite systems via (numerically) exact diagonon (Lanczos) techniques. We extend our results to polymers using both standard finite-size extrapolation techniques and a novel boundary-condition averaging scheme. First, we examine the nature of the lowest triplet state, focusing on the crossover from the free-electron picture of neutral soliton pairs to the strongly correlated limit of spin excitation. We then examine the optical absorption spectra corresponding to (allowed) triplet-triplet transitions; for this purpose it is important that our novel boundary-condition averaging method maintains sharp gap-edge features while reducing spurious rapid frequency variations produced by the finite-size approximations to the band-to-band continuum. We compare our results to data on triplet transitions in finite polyenes and discuss possible additional experimental implications, including the interpretation of recent spin-dependent photomodulation (SDPM) experiments in both trans-(CH)x and non-degenerate ground-state conjugated polymers. C1 USN,CTR OCEAN SYST,SAN DIEGO,CA 92152. THINKING MACHINES CORP,CAMBRIDGE,MA 02142. RP CAMPBELL, DK (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,MS-B258,LOS ALAMOS,NM 87545, USA. NR 26 TC 5 Z9 5 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD AUG 15 PY 1992 VL 50 IS 1-3 BP 631 EP 646 DI 10.1016/0379-6779(92)90220-D PG 16 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA JT306 UT WOS:A1992JT30600031 ER PT J AU GUIOCHON, G SEPANIAK, MJ AF GUIOCHON, G SEPANIAK, MJ TI INFLUENCE OF PRESSURE ON SOLUTE RETENTION IN LIQUID-CHROMATOGRAPHY SO JOURNAL OF CHROMATOGRAPHY LA English DT Note AB Confirming recent, independent experimental results, simple considerations of thermodynamics show that the logarithm of the retention factors of solutes vary linearly with increasing pressure, in the pressure range most commonly used (0-200 atm). The coefficient of this dependence increases linearly with the difference between the partial molar volumes of the solute in the stationary and the mobile phases. For homologues, this coefficient increases linearly with the number of carbon atoms and with the difference, DELTA-V(CH2), between the partial molar volumes of a CH2 group in the two phases. The pressure dependence of the retention factor may be significant because for a C18-methanol system DELTA-V(CH2)/V(CH2) is of the order of 6%. C1 OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN. RP GUIOCHON, G (reprint author), UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996, USA. NR 9 TC 31 Z9 31 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD AUG 14 PY 1992 VL 606 IS 2 BP 248 EP 250 DI 10.1016/0021-9673(92)87031-3 PG 3 WC Chemistry, Analytical SC Chemistry GA JJ900 UT WOS:A1992JJ90000012 ER PT J AU GINDT, YM ZHOU, JH BRYANT, DA SAUER, K AF GINDT, YM ZHOU, JH BRYANT, DA SAUER, K TI CORE MUTATIONS OF SYNECHOCOCCUS SP PCC-7002 PHYCOBILISOMES - A SPECTROSCOPIC STUDY SO JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY LA English DT Article DE PHYCOBILISOME; CYANOBACTERIA; FLUORESCENCE RELAXATION; APCDF MUTANT; APCF MUTANT; APCE C186S MUTANT ID MASTIGOCLADUS-LAMINOSUS PHYCOBILISOMES; ENERGY-TRANSFER; CYANOBACTERIAL PHYCOBILISOMES; ALLOPHYCOCYANIN-B; ANCHOR POLYPEPTIDE; PHOTOSYSTEM-II; SUBSTRUCTURE; PICOSECOND; COMPLEXES; KINETICS AB Three cyanobacterial strains harboring mutations affecting phycobilisome (PBS) cores were studied using steady state absorption and fluorescence and time-resolved fluorescence. The apcF mutant, missing beta-18, and the apcDF mutant, missing both alpha(APB) and beta-18, showed only small spectroscopic differences from the wild-type strain; their PBS emission was blue shifted by 10 nm, whereas their absorption spectra and time-resolved fluorescence kinetics were virtually unchanged. The third mutant studied was the apcE/C186S mutant in which the chromophore-binding cysteine-186 in the L(CM)99 polypeptide has been substituted with serine. The apcE/C186S mutant contained a modified chromophore which significantly changed the spectroscopic properties of the PBS complex. The apcE/C186S PBS absorbed more than the wild-type strain at 705 nm, and the emission spectrum gave two peaks at 660 nm and 715 nm. The time-resolved kinetics of the apcE/C186S mutant PBS were also significantly altered from those of the wild-type strain. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. PENN STATE UNIV,DEPT MOLEC & CELL BIOL,UNIV PK,PA 16802. RP GINDT, YM (reprint author), LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720, USA. FU NIGMS NIH HHS [GM-31625] NR 23 TC 31 Z9 33 U1 0 U2 9 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 1011-1344 J9 J PHOTOCH PHOTOBIO B JI J. Photochem. Photobiol. B-Biol. PD AUG 14 PY 1992 VL 15 IS 1-2 BP 75 EP 89 DI 10.1016/1011-1344(92)87007-V PG 15 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JP172 UT WOS:A1992JP17200007 PM 1460543 ER PT J AU RODRIGUEZ, JA GOODMAN, DW AF RODRIGUEZ, JA GOODMAN, DW TI THE NATURE OF THE METAL METAL BOND IN BIMETALLIC SURFACES SO SCIENCE LA English DT Article ID ULTRATHIN CU FILMS; ELECTRONIC-PROPERTIES; INTERMETALLIC COMPOUNDS; VIBRATIONAL PROPERTIES; THERMAL-DESORPTION; TUNGSTEN SURFACES; PHASE-TRANSITIONS; CO CHEMISORPTION; NI FILMS; AFT-IRAS AB The formation of a surface metal-metal bond can produce large perturbations in the electronic, chemical, and catalytic properties of a metal. Recent studies indicate that charge transfer is an important component in surface metal-metal bonds that involve dissimilar elements. The larger the charge transfer, the stronger the cohesive energy of the bimetallic bond. On a surface, the formation of a heteronuclear metal-metal bond induces a flow of electron density toward the element with the larger fraction of empty states in its valence band. This behavior is completely contrary to that observed in bulk alloys, indicating that the nature of a heteronuclear metal-metal bond depends strongly on the structural geometry of the bimetallic system. C1 TEXAS A&M UNIV SYST,DEPT CHEM,COLLEGE STN,TX 77843. RP RODRIGUEZ, JA (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 73 TC 548 Z9 554 U1 15 U2 191 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD AUG 14 PY 1992 VL 257 IS 5072 BP 897 EP 903 DI 10.1126/science.257.5072.897 PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JH827 UT WOS:A1992JH82700020 PM 17789634 ER PT J AU QUAITE, FE SUTHERLAND, BM SUTHERLAND, JC AF QUAITE, FE SUTHERLAND, BM SUTHERLAND, JC TI ACTION SPECTRUM FOR DNA DAMAGE IN ALFALFA LOWERS PREDICTED IMPACT OF OZONE DEPLETION SO NATURE LA English DT Article ID PYRIMIDINE DIMER FORMATION; HUMAN-SKIN; QUANTITATION; RADIATION AB DEPLETION of stratospheric ozone will increase the intensity of solar mid-ultraviolet (280-320 nm) radiation reaching the biosphere1. Predictions of increases in biologically effective ultraviolet radiation require knowledge of both the solar spectral intensity and the wavelength-dependent sensitivity (action spectrum) for damaging the biological target2. A generalized action spectrum for plant damage encompassing wavelengths from 280 to 313 nm3-5 has been widely used to predict the consequences of ozone depletion. Calculations6 based on this spectrum and new satellite measurements of atmospheric ozone suggest that plants will be among those organisms most severely affected. Here we report an absolute action spectrum for cyclobutyl pyrimidine dimer induction in DNA in intact alfalfa seedlings, which reveals damage by wavelengths as long as 365 nm. Calculations based on this new action spectrum predict significantly smaller increases in biologically effective ultraviolet radiation resulting from ozone depletion, particularly at high latitudes, than calculations based on either the generalized plant action spectrum or the action spectrum for damaging unshielded DNA. RP QUAITE, FE (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. NR 21 TC 217 Z9 233 U1 1 U2 7 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD AUG 13 PY 1992 VL 358 IS 6387 BP 576 EP 578 DI 10.1038/358576a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JH829 UT WOS:A1992JH82900057 ER PT J AU ESBENSEN, H KURATH, D LEE, TSH AF ESBENSEN, H KURATH, D LEE, TSH TI CORRELATION-EFFECTS IN B-11 (PI-,PI+) LI-11 REACTIONS SO PHYSICS LETTERS B LA English DT Article ID DOUBLE CHARGE-EXCHANGE; NUCLEAR-STRUCTURE; PION; SCATTERING AB We have studied the effect of the spatial correlation between the valence neutrons in Li-11 on the double-charge exchange reaction B-11(pi-, pi+)Li-11. The spatial correlation enhances the forward angle cross section by a factor of 2-3 compared to the prediction of an independent particle description. RP ESBENSEN, H (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 16 TC 3 Z9 3 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 AUG 13 PY 1992 VL 287 IS 4 BP 289 EP 292 DI 10.1016/0370-2693(92)90984-C PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JH742 UT WOS:A1992JH74200002 ER PT J AU TANIHATA, I KOBAYASHI, T SUZUKI, T YOSHIDA, K SHIMOURA, S SUGIMOTO, K MATSUTA, K MINAMISONO, T CHRISTIE, W OLSON, D WIEMAN, H AF TANIHATA, I KOBAYASHI, T SUZUKI, T YOSHIDA, K SHIMOURA, S SUGIMOTO, K MATSUTA, K MINAMISONO, T CHRISTIE, W OLSON, D WIEMAN, H TI DETERMINATION OF THE DENSITY DISTRIBUTION AND THE CORRELATION OF HALO NEUTRONS IN LI-11 SO PHYSICS LETTERS B LA English DT Article ID INTERACTION CROSS-SECTIONS; NUCLEAR RADII; LIGHT-NUCLEI; FRAGMENTATION; ISOTOPES; BEAMS AB Interaction cross sections (sigma(I)) and transverse momentum P(t) distributions of Li-9 fragments in Li-11 reactions were measured using p and d targets at 800A MeV, and Be and C targets at 400.4 MeV. The density distribution of the Li-11 nucleus has been determined for the first time from these sigma(I)'s. It is confirmed that only a distribution with a long tail (halo) consistently reproduces the observed data. From a combined analysis of P(t) distributions of Li-9 and of neutrons, the momentum correlation of the two halo neutrons was extracted. It suggests that these neutrons have a strong tendency to move in the same direction. C1 UNIV TOKYO,TOKYO 113,JAPAN. OSAKA UNIV,TOYONAKA,OSAKA 560,JAPAN. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP TANIHATA, I (reprint author), RIKEN,2-1 HIROSAWA,WAKO,SAITAMA 35101,JAPAN. RI Shimoura, Susumu/E-8692-2012 OI Shimoura, Susumu/0000-0003-4741-2865 NR 15 TC 156 Z9 159 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD AUG 13 PY 1992 VL 287 IS 4 BP 307 EP 311 DI 10.1016/0370-2693(92)90988-G PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JH742 UT WOS:A1992JH74200006 ER PT J AU ADAMS, MR AID, S ANTHONY, PL BAKER, MD BARTLETT, J BHATTI, AA BRAUN, HM BUSZA, W CARROLL, TJ CONRAD, JM COUTRAKON, G DAVISSON, R DERADO, I DHAWAN, SK DOUGHERTY, W DREYER, T DZIUNIKOWSKA, K ECKARDT, V ECKER, U ERDMANN, M ESKREYS, A FANG, G FIGIEL, J GEBAUER, HJ GEESAMAN, DF GILMAN, R GREEN, MC HAAS, J HALLIWELL, C HANLON, J HANTKE, D HUGHES, VW JACKSON, HE JAFFE, DE JANCSO, G JANSEN, DM KAUFMAN, S KENNEDY, RD KIRK, T KOBRAK, HGE KRZYWDZINSKI, S KUNORI, S LORD, JJ LUBATTI, HJ MCLEOD, D MAGILL, S MALECKI, P MANZ, A MELANSON, H MICHAEL, DG MOHR, W MONTGOMERY, HE MORFIN, JG NICKERSON, RB ODAY, S OLKIEWICZ, K OSBORNE, L PAPAVASSILIOU, V PAWLIK, B PIPKIN, FM RAMBERG, EJ ROSER, A RYAN, JJ SALGADO, C SALVARANI, A SCHELLMAN, H SCHMITT, M SCHMITZ, N SCHULER, KP SEYERLEIN, HJ SKUJA, A SNOW, GA SOLDNERREMBOLD, S STEINBERG, PH STIER, HE STOPA, P SWANSON, RA TALAGA, R TENTINDOREPOND, S TROST, HJ VENKATARAMANIA, H VIDAL, M WILHELM, M WILKES, J WILSON, R WITTEK, W WOLBERS, SA ZHAO, T AF ADAMS, MR AID, S ANTHONY, PL BAKER, MD BARTLETT, J BHATTI, AA BRAUN, HM BUSZA, W CARROLL, TJ CONRAD, JM COUTRAKON, G DAVISSON, R DERADO, I DHAWAN, SK DOUGHERTY, W DREYER, T DZIUNIKOWSKA, K ECKARDT, V ECKER, U ERDMANN, M ESKREYS, A FANG, G FIGIEL, J GEBAUER, HJ GEESAMAN, DF GILMAN, R GREEN, MC HAAS, J HALLIWELL, C HANLON, J HANTKE, D HUGHES, VW JACKSON, HE JAFFE, DE JANCSO, G JANSEN, DM KAUFMAN, S KENNEDY, RD KIRK, T KOBRAK, HGE KRZYWDZINSKI, S KUNORI, S LORD, JJ LUBATTI, HJ MCLEOD, D MAGILL, S MALECKI, P MANZ, A MELANSON, H MICHAEL, DG MOHR, W MONTGOMERY, HE MORFIN, JG NICKERSON, RB ODAY, S OLKIEWICZ, K OSBORNE, L PAPAVASSILIOU, V PAWLIK, B PIPKIN, FM RAMBERG, EJ ROSER, A RYAN, JJ SALGADO, C SALVARANI, A SCHELLMAN, H SCHMITT, M SCHMITZ, N SCHULER, KP SEYERLEIN, HJ SKUJA, A SNOW, GA SOLDNERREMBOLD, S STEINBERG, PH STIER, HE STOPA, P SWANSON, RA TALAGA, R TENTINDOREPOND, S TROST, HJ VENKATARAMANIA, H VIDAL, M WILHELM, M WILKES, J WILSON, R WITTEK, W WOLBERS, SA ZHAO, T TI SHADOWING IN THE MUON-XENON INELASTIC-SCATTERING CROSS-SECTION AT 490 GEV SO PHYSICS LETTERS B LA English DT Article ID PHOTON; NUCLEI AB Inelastic scattering of 490 GeV-mu+ from deuterium and xenon nuclei has been studied for x(Bj) > 0.001. The ratio of the xenon/deuterium cross section per nucleon is observed to vary with x(Bj), with a depletion in the kinematic range 0.001 < x(Bj) < 0.025 which exhibits no significant Q2 dependence. An electromagnetic calorimeter was used to verify the radiative corrections. C1 UNIV MARYLAND,COLL PK,MD 20742. MIT,CAMBRIDGE,MA 02139. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV WASHINGTON,SEATTLE,WA 98195. UNIV GESAMTHSCH WUPPERTAL,W-5600 WUPPERTAL 1,GERMANY. YALE UNIV,NEW HAVEN,CT 06520. UNIV FREIBURG,W-7800 FREIBURG,GERMANY. STANISLAW STASZIC UNIV MIN & MET,INST NUCL PHYS,PL-30059 KRAKOW,POLAND. INST NUCL PHYS,PL-31342 KRAKOW,POLAND. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. HARVARD UNIV,CAMBRIDGE,MA 02138. MAX PLANCK INST PHYS & ASTROPHYS,W-8000 MUNICH,GERMANY. NORTHWESTERN UNIV,EVANSTON,IL 60208. RP ADAMS, MR (reprint author), UNIV ILLINOIS,CHICAGO,IL 60680, USA. RI Carroll, Timothy/B-6934-2009 NR 17 TC 28 Z9 28 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD AUG 13 PY 1992 VL 287 IS 4 BP 375 EP 380 DI 10.1016/0370-2693(92)90999-K PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JH742 UT WOS:A1992JH74200017 ER PT J AU GORMLEY, RJ RAO, VUS SOONG, Y MICHELI, E AF GORMLEY, RJ RAO, VUS SOONG, Y MICHELI, E TI METHYL FORMATE HYDROGENOLYSIS FOR LOW-TEMPERATURE METHANOL SYNTHESIS SO APPLIED CATALYSIS A-GENERAL LA English DT Article DE COPPER CHROMITE; HYDROGENOLYSIS; METHANOL; METHYL FORMATE; RANEY COPPER; SYNGAS CONVERSION ID PHASE HYDROGENOLYSIS; COPPER; CATALYSTS; SILICA; ALCOHOLS; REACTOR AB The hydrogenolysis of methyl formate to methanol was studied in a liquid-phase reactor using a heterogeneous copper catalyst. This reaction is part of a process to produce methanol from synthesis gas starting with the carbonylation of methanol to methyl formate. Raney copper was compared with copper-chromite for hydrogenolysis activity at 110 to 160-degrees-C. The inhibition of the hydrogenolysis reaction by carbon monoxide was found to be lower at higher temperatures. A rate equation was derived to include this temperature dependence. Also, carbon monoxide made by a side reaction, the decarbonylation of methyl formate, was carefully measured and shown to account for only 1 to 2% of the total methanol produced at these temperatures. C1 SNAMPROGETTI,I-20097 SAN DONATO MILANE,ITALY. RP GORMLEY, RJ (reprint author), US DOE,PITTSBURGH ENERGY TECHNOL CTR,POB 10940,PITTSBURGH,PA 15236, USA. NR 20 TC 35 Z9 38 U1 1 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0926-860X J9 APPL CATAL A-GEN JI Appl. Catal. A-Gen. PD AUG 11 PY 1992 VL 87 IS 1 BP 81 EP 101 DI 10.1016/0926-860X(92)80174-B PG 21 WC Chemistry, Physical; Environmental Sciences SC Chemistry; Environmental Sciences & Ecology GA JL649 UT WOS:A1992JL64900006 ER PT J AU NOGUIEZ, P BARNES, DE MOHRENWEISER, HW LINDAHL, T AF NOGUIEZ, P BARNES, DE MOHRENWEISER, HW LINDAHL, T TI STRUCTURE OF THE HUMAN DNA LIGASE-I GENE SO NUCLEIC ACIDS RESEARCH LA English DT Article ID THYMIDINE KINASE GENE; EPSTEIN-BARR VIRUS; CELL-CYCLE; SACCHAROMYCES-CEREVISIAE; FUNCTIONAL EXPRESSION; NUCLEOTIDE-SEQUENCE; CATALYTIC DOMAIN; POLYMERASE-ALPHA; FISSION YEAST; RAT-LIVER AB The gene encoding DNA ligase I, the major DNA ligase activity in proliferating mammalian cells, maps to human chromosome 19q13.2-13.3. We have determined the complete structure of the gene, which is composed of 28 exons spanning 53kb on this chromosome. The first exon is untranslated, and utilises a GC dinucleotide instead of the canonical GT splice donor. The 5'flanking region lacks a TATA box and is highly GC-rich, as is characteristic of a 'housekeeping' gene. In common with the promoters of genes encoding other DNA replication enzymes, such as DNA polymerase alpha, the 5' flanking region of the DNA ligase I gene contains recognition elements for several transcription factors which may mediate increased expression in quiescent cells in response to growth factors. C1 IMPERIAL CANC RES FUND,CLARE HALL LABS,S MIMMS EN6 3LD,HERTS,ENGLAND. LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,DIV BIOMED SCI L452,LIVERMORE,CA 94550. NR 55 TC 20 Z9 20 U1 0 U2 0 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD AUG 11 PY 1992 VL 20 IS 15 BP 3845 EP 3850 DI 10.1093/nar/20.15.3845 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JJ802 UT WOS:A1992JJ80200005 PM 1508669 ER PT J AU CHALMERS, SA TSAO, JY GOSSARD, AC AF CHALMERS, SA TSAO, JY GOSSARD, AC TI LATERAL MOTION OF TERRACE WIDTH DISTRIBUTIONS DURING STEP-FLOW GROWTH SO APPLIED PHYSICS LETTERS LA English DT Article ID (AL,GA)SB TILTED SUPERLATTICES; MOLECULAR-BEAM EPITAXY; DEPOSITION; SURFACES AB We have observed two phenomena that occur during (Al,Ga)Sb lateral superlattice (LSL) growth which have implications on our understanding of adatom/step edge interactions on vicinal surfaces: shifts of the lateral distribution of terrace widths in the direction of step propagation, and lateral variations in the superlattice tilt angle that are correlated with the terrace width distribution. Both phenomena can be explained with a model of step-flow growth that includes both asymmetric adatom attachment at step edges and anisotropic adatom crossing over multiple step edges. A comparison between numerical simulations of this model and experimentally observed (Al,Ga)Sb LSL terrace width distributions leads to quantitative estimates of adatom migration characteristics. We find that at least one type of adatom, probably Ga, has a migration length equivalent to several terrace widths, and moves up and down step edges nearly isotropically. This method of determining adatom migration characteristics can be extended to any material that LSL layers can be grown above and below as terrace width markers. C1 UNIV CALIF SANTA BARBARA,DEPT MAT,SANTA BARBARA,CA 93106. RP CHALMERS, SA (reprint author), SANDIA NATL LABS,DIV 1311,ALBUQUERQUE,NM 87185, USA. NR 11 TC 14 Z9 14 U1 2 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 10 PY 1992 VL 61 IS 6 BP 645 EP 647 DI 10.1063/1.107809 PG 3 WC Physics, Applied SC Physics GA JG946 UT WOS:A1992JG94600009 ER PT J AU STRONGIN, DR MOORE, JF RUCKMAN, MW AF STRONGIN, DR MOORE, JF RUCKMAN, MW TI SYNCHROTRON RADIATION ASSISTED DEPOSITION OF ALUMINUM-OXIDE FROM CONDENSED LAYERS OF TRIMETHYLALUMINUM AND WATER AT 78-K SO APPLIED PHYSICS LETTERS LA English DT Article ID AL(111); OXYGEN AB Spectroscopic evidence is presented that shows that synchrotron irradiation of trimethylaluminum (TMA) and water at 78 K on a silver substrate produces pure layers of aluminum oxide. Near-edge x-ray absorption fine structure and core level photoelectron spectroscopies are used to characterize the Al2O3 layer, which was 30 angstrom thick. The carbon component in the alkylaluminum precursor is completely removed during irradiation as volatile methane product. In the absence of synchrotron radiation the molecular precursors show evidence of some interactions within the solid, but upon warming to ambient temperatures (260 K) the adsorbed layers desorb from the substrate. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP STRONGIN, DR (reprint author), SUNY STONY BROOK,DEPT CHEM,STONY BROOK,NY 11794, USA. NR 7 TC 16 Z9 16 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 10 PY 1992 VL 61 IS 6 BP 729 EP 731 DI 10.1063/1.107781 PG 3 WC Physics, Applied SC Physics GA JG946 UT WOS:A1992JG94600037 ER PT J AU WOOSLEY, SE HOFFMAN, RD AF WOOSLEY, SE HOFFMAN, RD TI THE ALPHA-PROCESS AND THE R-PROCESS SO ASTROPHYSICAL JOURNAL LA English DT Article DE NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES; SUPERNOVAE, GENERAL ID THERMONUCLEAR REACTION-RATES; WEAK-INTERACTION RATES; INTERMEDIATE-MASS NUCLEI; EXPLOSIVE NUCLEOSYNTHESIS; SUPERNOVA EXPLOSIONS; CROSS-SECTIONS; NEUTRON-STARS; ENERGY-LEVELS; LIGHT-NUCLEI; ELEMENTS AB If material initially in nuclear statistical equilibrium (NSE) at high temperature and containing a large fraction of alpha-particles (or nucleons) is expanded and cooled so rapidly that not all the alpha-particles have time to reassemble, its final composition will differ substantially from what is traditionally calculated for particle-deficient freeze-outs. It has long been known that this phenomenon, the "alpha-rich freeze-out," can lead to the production of elements heavier than the iron group, but only up to about zinc (A approximately 66). Here we explore the alpha-rich freeze-out for values of neutron excesses larger than previously treated and discover nuclear systematics that, for neutron excesses greater than about 0.05, allow the creation of heavier elements all the way up to A approximately 100, even when most of the ejecta is in the form of heavy elements. In the limit of a very large fraction of unassembled alpha-particles and a large neutron excess, the alpha-rich freeze-out merges smoothly into the classical r-process. In contrast to previous studies, we find that a large part of the nuclear flow in the r-process may be carried by charged particle reactions up to about A = 100. We speculate that the site of these processes is the high-entropy " wind " of a young (age 1-10 s) neutron star in which neutrino energy deposition is driving mass loss. The appropriate conditions exist in the delayed supernova explosion mechanism of Mayle & Wilson, but they may occur in other models as well. The mass of r-process ejected per supernova is expected to be approximately 10(-4) M. per Type II or Ib supernova, but this will be sensitive to details of the presupernova structure, the explosion mechanism, and the amount of material that falls back onto the neutron star when the reverse shock arrives here. C1 LAWRENCE LIVERMORE NATL LAB,GEN STUDIES GRP,LIVERMORE,CA 94550. SAN FRANCISCO STATE UNIV,DEPT PHYS & ASTRON,SAN FRANCISCO,CA 94132. RP WOOSLEY, SE (reprint author), UNIV CALIF SANTA CRUZ,LICK OBSERV,BOARD STUDIES ASTRON & ASTROPHYS,SANTA CRUZ,CA 95064, USA. NR 103 TC 369 Z9 373 U1 0 U2 9 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 10 PY 1992 VL 395 IS 1 BP 202 EP 239 DI 10.1086/171644 PN 1 PG 38 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JF699 UT WOS:A1992JF69900019 ER PT J AU GONCZ, KK ROTHMAN, SS AF GONCZ, KK ROTHMAN, SS TI PROTEIN FLUX ACROSS THE MEMBRANE OF SINGLE SECRETION GRANULES SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Article DE PROTEIN TRANSPORT; SECRETION GRANULE; MEMBRANE PERMEABILITY ID PANCREATIC ZYMOGEN GRANULES; X-RAY MICROSCOPE; CYTOCHROME-C; RESOLUTION; RELEASE; INVITRO; ENZYMES; SIZE AB We have applied, for the first time to our knowledge, X-ray microscopy to measure the mass of protein contained in single sub-cellular membrane-bound structures and to make high resolution, time-resolved observations on them. Using this method we have been able to follow the flux of protein out of secretion (zymogen) granules isolated from the acinar cells of the exocrine pancreas. The results provide direct visual and quantitative confirmation of the hypothesis that the membrane enclosing this object is permeable to its various contained proteins, although the mechanism remains unknown. C1 UNIV CALIF BERKELEY,BERKELEY,CA 94720. RP GONCZ, KK (reprint author), LAWRENCE BERKELEY LAB,2-400,BERKELEY,CA 94720, USA. NR 44 TC 15 Z9 15 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0006-3002 J9 BIOCHIM BIOPHYS ACTA PD AUG 10 PY 1992 VL 1109 IS 1 BP 7 EP 16 DI 10.1016/0005-2736(92)90181-K PG 10 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JK715 UT WOS:A1992JK71500002 PM 1504082 ER PT J AU BANERJEE, A ADAMS, NP AF BANERJEE, A ADAMS, NP TI ON COORDINATE TRANSFORMATIONS IN STEEPEST DESCENT PATH AND STATIONARY POINT LOCATIONS SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Article ID CHEMICAL-REACTIONS; TRANSITION-STATES; 3 PARTICLES; INVARIANCE; DYNAMICS; SURFACE; SYSTEMS; SEARCH AB Two aspects of the problems of calculating steepest descent paths and locating stationary points on surfaces E(X), which are sources of some confusion in the literature, are addressed. These include writing proper expressions for the gradient and Hessian, and their transformation properties relative to coordinate transformations, based on the invariance of the surface E(X). The appropriate transformation is derived, based on a constrained energy minimization condition, to achieve what we call the Hessian eigenvalue representation. This not only allows decoupling of the variables, but also points to the minimization direction and preserves the eigenvalues of the Hessian. These results allow one to use the steepest descent path and stationary point location algorithms in any coordinate system and obtain invariant results. The validity of these considerations are also confirmed through numerical examples. The stationary condition with constrained kinematic path length is also shown to yield a Hessian eigenvalue representation for the normal modes for small vibrations. Lastly, we have constructed a mathematically consistent definition of mass-weighted Cartesians where the intrinsic reaction path of Fukui is a steepest descent path. RP BANERJEE, A (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,THEORY PROJECT,POB 1625,IDAHO FALLS,ID 83415, USA. NR 24 TC 31 Z9 31 U1 0 U2 4 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0020-7608 J9 INT J QUANTUM CHEM JI Int. J. Quantum Chem. PD AUG 10 PY 1992 VL 43 IS 6 BP 855 EP 871 DI 10.1002/qua.560430610 PG 17 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA JF957 UT WOS:A1992JF95700009 ER PT J AU KRAUSS, LM ROMANELLI, P SCHRAMM, D LEHRER, R AF KRAUSS, LM ROMANELLI, P SCHRAMM, D LEHRER, R TI THE SIGNAL FROM A GALACTIC SUPERNOVA - MEASURING THE TAU-NEUTRINO MASS SO NUCLEAR PHYSICS B LA English DT Article ID ANTINEUTRINO; BURST; 1987A AB We have developed a comprehensive Monte Carlo analysis in order to simulate the neutrino signal from a galactic supernova in a large water Cerenkov detector. This allows us to demonstrate that, by exploiting the various features of the signal in a way which is largely independent of the supernova model, assuming only that the late-time behaviour of the signal is flavor independent, a sensitivity to a tau-neutrino mass down to the cosmologically interesting range of almost-equal-to 25 eV for a medium luminosity burst is possible. This is the case even though the tau signal involves almost-equal-to 50 out of almost-equal-to 10000 total events in a detector of the size of that proposed for "Super Kamiokande". In addition, our results allow us to elucidate several aspects of a supernova neutrino signal in water detectors which had not been previously explored, including new results on the observability of the neutronization burst. C1 YALE UNIV, SLOANE LAB, DEPT ASTRON, NEW HAVEN, CT 06511 USA. BANKERS TRUST CO, NEW YORK, NY 10006 USA. UNIV CHICAGO, CHICAGO, IL 60637 USA. YALE UNIV, YALE COLL, NEW HAVEN, CT 06517 USA. NASA, FERMILAB ASTROPHYS CTR, BATAVIA, IL 60510 USA. RP KRAUSS, LM (reprint author), YALE UNIV, SLOANE LAB, CTR THEORET PHYS, NEW HAVEN, CT 06511 USA. NR 23 TC 16 Z9 16 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 AUG 10 PY 1992 VL 380 IS 3 BP 507 EP 542 DI 10.1016/0550-3213(92)90256-B PG 36 WC Physics, Particles & Fields SC Physics GA JH123 UT WOS:A1992JH12300009 ER PT J AU BURGIO, GF CHOMAZ, P RANDRUP, J AF BURGIO, GF CHOMAZ, P RANDRUP, J TI DYNAMIC CLUSTERIZATION IN THE PRESENCE OF INSTABILITIES SO PHYSICAL REVIEW LETTERS LA English DT Article ID NUCLEAR COLLISIONS; FLUCTUATIONS; SYSTEMS; DENSITY AB Using a recently developed Boltzmann-Langevin treatment, we study cluster formation in unstable nuclear matter. The self-consistent propagation of the spontaneous fluctuations restores the predictive power of the one-body approach, even when such catastrophic phenomena are addressed. C1 GRAND ACCELERATEUR NATL IONS LOURDS,F-14021 CAEN,FRANCE. GESELL SCHWERIONENFORSCH GMBH,W-6100 DARMSTADT 11,GERMANY. RP BURGIO, GF (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 12 TC 66 Z9 66 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 AUG 10 PY 1992 VL 69 IS 6 BP 885 EP 888 DI 10.1103/PhysRevLett.69.885 PG 4 WC Physics, Multidisciplinary SC Physics GA JJ328 UT WOS:A1992JJ32800006 ER PT J AU ABERNATHY, DL MOCHRIE, SGJ ZEHNER, DM GRUBEL, G GIBBS, D AF ABERNATHY, DL MOCHRIE, SGJ ZEHNER, DM GRUBEL, G GIBBS, D TI THERMAL ROUGHNESS OF A CLOSE-PACKED METAL-SURFACE - PT(001) SO PHYSICAL REVIEW LETTERS LA English DT Article ID X-RAY-SCATTERING; COPPER 110 SURFACE; ROUGHENING TRANSITION; AU(001) SURFACE; AU(111) SURFACE; PHASES; REFLECTIVITY; FLUCTUATIONS; BEHAVIOR; GRAPHITE AB An x-ray scattering study of the morphology of the Pt(001) surface reveals that below 1820 K it is atomically smooth on length scales exceeding 5000 angstrom. However, above 1820 K the Pt(001) surface is rough. Specifically, the scattering near the specular condition is diffuse, and may be modeled using a height-height correlation function which diverges logarithmically at large distances. Our data suggest that the average separation between thermally generated steps is many lattice constants. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP ABERNATHY, DL (reprint author), MIT,DEPT PHYS,CAMBRIDGE,MA 02139, USA. RI Abernathy, Douglas/A-3038-2012 OI Abernathy, Douglas/0000-0002-3533-003X NR 31 TC 29 Z9 29 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 10 PY 1992 VL 69 IS 6 BP 941 EP 944 DI 10.1103/PhysRevLett.69.941 PG 4 WC Physics, Multidisciplinary SC Physics GA JJ328 UT WOS:A1992JJ32800020 ER PT J AU YONEMITSU, K BISHOP, AR LORENZANA, J AF YONEMITSU, K BISHOP, AR LORENZANA, J TI SENSITIVITY OF DOPING STATES IN THE COPPER OXIDES TO ELECTRON-LATTICE COUPLING SO PHYSICAL REVIEW LETTERS LA English DT Article ID CHARGE-TRANSFER EXCITATIONS; HUBBARD-MODEL; HARTREE-FOCK; SUPERCONDUCTIVITY; PHONONS; SOLITON; ANTIFERROMAGNET; YBA2CU3O7-DELTA; POLYACETYLENE; MAGNETISM AB Doping states in a two-dimensional three-band Peierls-Hubbard model are investigated with inhomogeneous Hartree-Fock and random phase approximations. They are sensitive to small changes of electron-lattice and electron-electron interactions. For parameters relevant to the insulating copper oxides a small ferromagnetic polaron is found. Moderate intersite electron-lattice coupling triggers a nonlinear feedback mechanism resulting in a rapid crossover from a Zhang-Rice regime to a covalent molecular singlet state in which the local magnetic moment is quenched and local lattice distortion is large. Various states are characterized by distinct optical and infrared absorption spectra. C1 SCUOLA INT SUPER STUDI AVANZATI,I-34014 TRIESTE,ITALY. RP YONEMITSU, K (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. RI Lorenzana, Jose/A-2809-2008 OI Lorenzana, Jose/0000-0001-7426-2570 NR 30 TC 89 Z9 89 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 AUG 10 PY 1992 VL 69 IS 6 BP 965 EP 968 DI 10.1103/PhysRevLett.69.965 PG 4 WC Physics, Multidisciplinary SC Physics GA JJ328 UT WOS:A1992JJ32800026 ER PT J AU WOSNITZA, J CRABTREE, GW WANG, HH CARLSON, KD VASHON, MD WILLIAMS, JM AF WOSNITZA, J CRABTREE, GW WANG, HH CARLSON, KD VASHON, MD WILLIAMS, JM TI ANGULAR-DEPENDENCE OF THE CYCLOTRON EFFECTIVE MASS IN ORGANIC SUPERCONDUCTORS - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Letter C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. UNIV KARLSRUHE,INST PHYS,W-7500 KARLSRUHE 1,GERMANY. RP WOSNITZA, J (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 10 PY 1992 VL 69 IS 6 BP 992 EP 992 DI 10.1103/PhysRevLett.69.992 PG 1 WC Physics, Multidisciplinary SC Physics GA JJ328 UT WOS:A1992JJ32800038 ER PT J AU RUSTANDI, RR SNYDER, SW BIGGINS, J NORRIS, JR THURNAUER, MC AF RUSTANDI, RR SNYDER, SW BIGGINS, J NORRIS, JR THURNAUER, MC TI RECONSTITUTION AND EXCHANGE OF QUINONES IN THE A1 SITE OF PHOTOSYSTEM-I - AN ELECTRON-SPIN POLARIZATION ELECTRON-PARAMAGNETIC RESONANCE STUDY SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Article DE PHOTOSYSTEM I; EPR; ELECTRON SPIN POLARIZATION; VITAMIN K1; PHYLLOQUINONE; A1 ACCEPTOR ID PHOTOSYNTHETIC REACTION CENTERS; RHODOBACTER-SPHAEROIDES R-26; RADICAL PAIR INTERACTIONS; TIME-RESOLVED EPR; LOW-TEMPERATURE; RHODOPSEUDOMONAS-VIRIDIS; TRANSFER KINETICS; ROOM-TEMPERATURE; 3A RESOLUTION; K-BAND AB The electron spin polarized (ESP) electron paramagnetic resonance (EPR) signal observed in spinach Photosystem I (PS I) particles was examined in preparations depleted of vitamin K1 by solvent extraction, followed by reconstitution with a series of quinones and quinone analogues. The ESP EPR signal was previously attributed to a radical pair that included vitamin K1- (Rustandi, R.R., et al. (1990) Biochemistry 29, 8030-8032) and, in addition, vitamin K1 was assigned as the secondary acceptor A1 in PS I (Snyder, S.W., et al. (1991) Proc. Natl. Acad. Sci. USA, 88, 9895-98%). The ESP EPR signal was observed in untreated PS I preparations, was not detected in the solvent-extracted PS I samples and was restored upon reconstitution using certain quinones. The ability to restore the ESP EPR signal was dependent upon two properties of the reconstituted acceptor. First, the solution reduction potential of the reconstituted acceptor must be more positive than about -750 mV where the solution reduction potential of vitamin K1 is -710 mV. Second, the structure of the reconstituted acceptor requires either a minimum of two aromatic rings (i.e., naphthoquinone) or a benzoquinone (or larger) derivative substituted with an alkyl tail. A model was developed to describe both the requirements for electron transfer to A1 and also previous results for electron transfer from A1- to the iron-sulfur centers (Biggins, J. (1990) Biochemistry 29, 7259-7264). When untreated PS I preparations were incubated with perdeuterated vitamin K1 (DK1) the endogenous K1 was observed to exchange with DK1. The replacement rate was strongly dependent upon temperature (h-days at 4-degrees-C, min at 37-degrees-C) and upon illumination (min). Naphthoquinones lacking a long alkyl tail were unable to exchange with endogenous vitamin K1. Although no known physiological role exists for vitamin K1 ejection from its A1 binding site, the quinone appears to be somewhat labile. Direct exchange of vitamin K1 with exogenously supplied quinones indicates that the PS I A1 site might be a target for the design of new herbicides in green plants. C1 ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. UNIV CHICAGO, DEPT CHEM, CHICAGO, IL 60637 USA. BROWN UNIV, BIOCHEM SECT, PROVIDENCE, RI 02912 USA. RI Snyder, Seth/C-4370-2008 OI Snyder, Seth/0000-0001-6232-1668 NR 60 TC 25 Z9 26 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0006-3002 J9 BIOCHIM BIOPHYS ACTA JI Biochim. Biophys. Acta PD AUG 7 PY 1992 VL 1101 IS 3 BP 311 EP 320 DI 10.1016/0005-2728(92)90087-I PG 10 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JJ522 UT WOS:A1992JJ52200004 ER PT J AU TRUHLAR, DG GARRETT, BC AF TRUHLAR, DG GARRETT, BC TI RESONANCE STATE APPROACH TO QUANTUM-MECHANICAL VARIATIONAL TRANSITION-STATE THEORY SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID THERMAL RATE CONSTANTS; REACTION PROBABILITIES; PHOTODETACHMENT SPECTRUM; REDUCED DIMENSIONALITY; TUNNELING CALCULATIONS; CHEMICAL-REACTIONS; SCATTERING; SURFACE; MODEL; COLLISIONS AB Variational transition state theory is reformulated in terms of compound state resonances associated with the transition state region. The use of the formalism is illustrated for two-dimensional model problems, which are treated by the adiabatic theory of reactions and by perturbation theory. The limitations of the latter are delineated for the case of a biquadratic (quartic) coupling of the reaction coordinate to a transverse vibration. C1 UNIV MINNESOTA, INST SUPERCOMP, MINNEAPOLIS, MN 55455 USA. PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RP TRUHLAR, DG (reprint author), UNIV MINNESOTA, DEPT CHEM, MINNEAPOLIS, MN 55455 USA. RI Garrett, Bruce/F-8516-2011; Truhlar, Donald/G-7076-2015 OI Truhlar, Donald/0000-0002-7742-7294 NR 84 TC 32 Z9 32 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD AUG 6 PY 1992 VL 96 IS 16 BP 6515 EP 6518 DI 10.1021/j100195a001 PG 4 WC Chemistry, Physical SC Chemistry GA JH640 UT WOS:A1992JH64000001 ER PT J AU HOFFMAN, DK ARNOLD, M KOURI, DJ AF HOFFMAN, DK ARNOLD, M KOURI, DJ TI PROPERTIES OF THE OPTIMUM DISTRIBUTED APPROXIMATING FUNCTION CLASS PROPAGATOR FOR DISCRETIZED AND CONTINUOUS WAVE PACKET PROPAGATIONS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID FEYNMAN PATH INTEGRATION; DYNAMICS; TIME AB A new, more concise derivation of the continuous and discretized distributed approximating function (CDAF and DDAF) class free propagators and a detailed explication of their properties are presented. The DAF class propagators are characterized by three factors: namely, a real Gaussian, a unimodulator oscillatory factor, and a 'shape polynomial' of degree M (with M even) which has complex coefficients. For the continuous version of the theory, these factors are solely a function of the time step-tau and take the forms exp[-m(x'- x)2/4h-tauBAR], exp[im(x'- x)2/4h-tauBAR], and g(M)(x - x\sigma(0)=(h-tauBAR/m)1/2,tau) respectively, where sigma(0) = (h-tauBAR/m)1/2 is the width of the Gaussian envelope of the CDAF. The discrete version of the theory requires slightly different forms for these factors, because the choice of sigma(0) depends also on the grid spacing. The relationship sigma(0) = (h-tauBAR/m)1/2, which gives the optimum choice of the Gaussian envelope of the CDAF for minimizing its spread in time-tau, is derived. The relationship between the Gaussian width sigma(0) and the degree of the shape polynomial is given, and it is shown that the specification of the time step-tau is sufficient to fix all other parameters. The time step-tau is determined by the characteristics of the propagator algorithm being used. C1 UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. NR 13 TC 60 Z9 60 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD AUG 6 PY 1992 VL 96 IS 16 BP 6539 EP 6545 DI 10.1021/j100195a007 PG 7 WC Chemistry, Physical SC Chemistry GA JH640 UT WOS:A1992JH64000007 ER PT J AU KNICKELBEIN, MB MENEZES, WJC AF KNICKELBEIN, MB MENEZES, WJC TI METAL CLUSTER RARE-GAS VANDERWAALS COMPLEXES - PHYSISORPTION ON A MICROSCOPIC SCALE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID IONIZATION-POTENTIALS; NIOBIUM CLUSTERS; NICKEL CLUSTERS; ELECTRON-BINDING; XENON ADSORPTION; IRON CLUSTERS; PHOTOIONIZATION; CHEMISORPTION; REACTIVITY; KINETICS AB Van der Waals complexes consisting of argon or krypton atoms bound to clusters of iron, cobalt, nickel, and niobium atoms have been generated by supersonic expansion from a liquid nitrogen-cooled laser vaporization source. Laser photoionization time-of-flight mass spectrometry reveals significant nonmonotonic variations in the efficiency of formation of these species as a function of metal cluster size. A correlation between these variations and the size-dependent reactivities of the bare metal clusters toward molecular hydrogen is observed. This correlation suggests that those metal cluster surface sites which readily support the binding of mm ps atoms are also highly reactive sites in direct cluster-hydrogen encounters. Alternatively, this correlation may imply that these cluster-hydrogen reactions occur by a two-step mechanism involving the production of a physisorbed M(n)...H-2 intermediate. Analysis of the post-threshold behavior in the photoionization efficiency spectra of niobium cluster-argon van der Waals species (Nb(n)Ar(m)) suggests that argon atoms bind with different efficiencies to each of the structural isomers of Nb7, Nb9, and Nb11. RP KNICKELBEIN, MB (reprint author), ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. NR 30 TC 38 Z9 38 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD AUG 6 PY 1992 VL 96 IS 16 BP 6611 EP 6616 DI 10.1021/j100195a019 PG 6 WC Chemistry, Physical SC Chemistry GA JH640 UT WOS:A1992JH64000019 ER PT J AU JELINEK, R CHMELKA, BF STEIN, A OZIN, GA AF JELINEK, R CHMELKA, BF STEIN, A OZIN, GA TI MULTINUCLEAR MAGIC-ANGLE SPINNING AND DOUBLE-ROTATION NMR-STUDY OF THE SYNTHESIS AND ASSEMBLY OF A SODALITE SEMICONDUCTOR SUPRALATTICE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; QUANTUM SUPRALATTICES; CHEMICAL-SHIFTS; AL-27 NMR; ZEOLITES; SILVER; SI-29; NA-23; DOTS AB Si-29 magic-angle spinning, Al-27 and Na-23 magic-angle spinning, and double rotation NMR provide structural and electronic details for the newly developed sodalite semiconductor quantum supralattices. The evolution of the nucleation and crystallization processes of sodium halide sodalites is monitored, and the appearance of anion-empty sodalite cages is detected. Subtle changes in the electronic and quadrupolar interactions of sodium and aluminum nuclei occur upon loading chloride, bromide, and iodide into the sodalite cages. The NMR results suggest that the development of electronic coupling occurs throughout the lattice in mixed-halide chloro,iodosodalites. A preference for silver exchange of sodium cations in halide-containing cages, over hydroxide-containing and anion-empty sodalite cavities, is detected. Extraction of the isotropic chemical shift and quadrupolar contributions to the sodium resonances is achieved by performing the NMR experiments at two magnetic field strengths. The parameters obtained indicate a change in the charge distribution around the sodium nuclei upon exchanging approximately one-quarter of the extraframework Na+ cations with silver, which parallels other data pointing to the onset of a semiconductor supralattice within the sodalite matrix. C1 UNIV TORONTO,LASH MILLER CHEM LABS,ADV ZEOLITE MAT RES GRP,80 ST GEORGE ST,TORONTO M5S 1A1,ONTARIO,CANADA. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF SANTA BARBARA,DEPT CHEM & NUCL ENGN,SANTA BARBARA,CA 93106. OI jelinek, raz/0000-0002-0336-1384 NR 37 TC 20 Z9 20 U1 0 U2 4 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 AUG 6 PY 1992 VL 96 IS 16 BP 6744 EP 6752 DI 10.1021/j100195a040 PG 9 WC Chemistry, Physical SC Chemistry GA JH640 UT WOS:A1992JH64000040 ER PT J AU CHUN, EJ KIM, JE NILLES, HP AF CHUN, EJ KIM, JE NILLES, HP TI AXINO MASS SO PHYSICS LETTERS B LA English DT Article ID STRONG CP-PROBLEM; COSMOLOGICAL IMPLICATIONS; GAUGINO CONDENSATION; PARTICLE PHYSICS; SUPERSYMMETRY AB The mass of the axino is computed in realistic supersymmetric extensions of the standard model. It is found to be strongly model dependent and can be as small as a few keV but also as large as the gravitino mass. Estimates of this mass can only be believed once a careful analysis of the scalar potential has been performed. C1 SEOUL NATL UNIV,CTR THEORET PHYS,SEOUL 151742,SOUTH KOREA. SEOUL NATL UNIV,DEPT PHYS,SEOUL 151742,SOUTH KOREA. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP CHUN, EJ (reprint author), TECH UNIV MUNICH,DEPT PHYS,W-8046 GARCHING,GERMANY. NR 12 TC 102 Z9 102 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD AUG 6 PY 1992 VL 287 IS 1-3 BP 123 EP 127 DI 10.1016/0370-2693(92)91886-E PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JH092 UT WOS:A1992JH09200021 ER PT J AU CARLSON, KD KINI, AM KLEMM, RA WANG, HH WILLIAMS, JM GEISER, U KUMAR, SK FERRARO, JR LYKKE, KR WURZ, P FLESHLER, S DUDEK, JD EASTMAN, NL MOBLEY, PR SEAMAN, JM SUTIN, JDB YACONI, GA PARKER, DH STOUT, P AF CARLSON, KD KINI, AM KLEMM, RA WANG, HH WILLIAMS, JM GEISER, U KUMAR, SK FERRARO, JR LYKKE, KR WURZ, P FLESHLER, S DUDEK, JD EASTMAN, NL MOBLEY, PR SEAMAN, JM SUTIN, JDB YACONI, GA PARKER, DH STOUT, P TI C-13=C-13 ISOTOPE EFFECT FOR TC AND CONSEQUENCES REGARDING THE SUPERCONDUCTING PAIRING MECHANISM IN KAPPA-(ET)2X SUPERCONDUCTORS SO INORGANIC CHEMISTRY LA English DT Article ID PRESSURE ORGANIC SUPERCONDUCTOR; INFRARED OPTICAL-PROPERTIES; BEDT-TTF; BIS(ETHYLENEDITHIO)TETRATHIAFULVALENE; KAPPA-(BEDT-TTF)2CUBR; (BEDT-TTF)2; TEMPERATURE; CONDUCTORS; TRANSITION; PHASES AB Is the stretching motion of thc central C=C bond in the ET molecule [bis(ethylenedithio)tetrathiafulvalene] a major source of phonons for superconducting electron pairing in ET-based layered organic cation/polymeric inorganic anion superconductors? This possibility has theoretical support and recent experimental affirmation in beta*-(ET)2I3, a pressurized salt with T(c) almost-equal-to 8 K. New studies of the two highest-T(c) c) layered, ambient-pressure kappa-phase salts, kappa-(ET)2. Cu[N(CN)2]Br (T(c) = 11.7 +/- 0.1 K) and kappa-(ET)2Cu(NCS)2 (T(c) = 9.6 +/- 0.1 K), show that the C=C stretching motion is not a dominant mechanism, nor, in fact, a very likely one over conventional BCS-type pairing in any ET-based organic superconductor. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. UNIV CALIF IRVINE,DEPT CHEM,IRVINE,CA 92717. BIORAD,DIV DIGILAB,CAMBRIDGE,MA 02137. RP CARLSON, KD (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. RI Kini, Aravinda/F-4467-2012 NR 28 TC 19 Z9 19 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD AUG 5 PY 1992 VL 31 IS 16 BP 3346 EP 3348 DI 10.1021/ic00042a004 PG 3 WC Chemistry, Inorganic & Nuclear SC Chemistry GA JH234 UT WOS:A1992JH23400004 ER PT J AU CHEN, G PETERSON, JR AF CHEN, G PETERSON, JR TI SYSTEMATICS OF THE PHASE-BEHAVIOR IN LANTHANIDE SESQUIOXIDES SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article AB The crystal structures of the lanthanide (Ln) sesquioxides, Ln2O3, are systematized according to the radius ratio-eta between the lanthanide ion crystal radius and the "equivalent formula unit radius" which is derived from the unit cell volume of the sesquioxide. New criteria for the stability range of each structure are given quantitatively. These criteria were used to correlate the phase transformations of lanthanide sesquioxides with two critical values of eta: B --> A occurs at eta = 2.26; C --> B occurs at eta = 2.42. The C --> B phase transformation pressure in Eu2O3 was estimated. The polymorphism of lanthanide sesquioxides at any temperature and pressure can be estimated using these new systematic critical values. C1 OAK RIDGE NATL LAB,DIV CHEM,TRANSURANIUM RES LAB,OAK RIDGE,TN 37831. RP CHEN, G (reprint author), UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996, USA. NR 10 TC 3 Z9 3 U1 0 U2 5 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 AUG 5 PY 1992 VL 186 IS 2 BP 233 EP 239 DI 10.1016/0925-8388(92)90009-X PG 7 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA JJ303 UT WOS:A1992JJ30300009 ER PT J AU ULLRICH, SJ ANDERSON, CW MERCER, WE APPELLA, E AF ULLRICH, SJ ANDERSON, CW MERCER, WE APPELLA, E TI THE P53 TUMOR SUPPRESSOR PROTEIN, A MODULATOR OF CELL-PROLIFERATION SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Review ID LARGE-T-ANTIGEN; WILD-TYPE P53; NUCLEAR-LOCALIZATION; MONOCLONAL-ANTIBODY; DNA-REPLICATION; CYCLE CONTROL; TRANSCRIPTIONAL ACTIVATION; SV40-TRANSFORMED CELLS; TRANSFORMED-CELLS; GROWTH-REGULATION C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. THOMAS JEFFERSON UNIV,JEFFERSON CANC INST,DEPT MICROBIOL & IMMUNOL,PHILADELPHIA,PA 19107. RP ULLRICH, SJ (reprint author), NCI,CELL BIOL LAB,BETHESDA,MD 20892, USA. FU NCI NIH HHS [CA 42866]; NCRR NIH HHS [S07 RR05417] NR 86 TC 223 Z9 225 U1 0 U2 3 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 AUG 5 PY 1992 VL 267 IS 22 BP 15259 EP 15262 PG 4 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JG113 UT WOS:A1992JG11300001 PM 1639769 ER PT J AU RANA, TM BAN, M HEARST, JE AF RANA, TM BAN, M HEARST, JE TI SYNTHESIS OF A METAL-LIGATING AMINO-ACID SUITABLE FOR SOLID-PHASE ASSEMBLY OF PEPTIDES SO TETRAHEDRON LETTERS LA English DT Article ID CHELATING-AGENTS; PROTECTING GROUP; IRON CHELATE; PROTEIN; DNA; CLEAVAGE; BINDING; EDTA; PROTEOLYSIS; ANTIBODIES AB The synthesis of an amino acid analog, N-alpha-Fmoc-N-epsilon-Tetrabutyl EDTA-L-Lysine, suitable for incorporating a strong metal binding site at any internal sequence position in a peptide is described. C1 LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720. RP RANA, TM (reprint author), LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720, USA. NR 30 TC 11 Z9 11 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0040-4039 J9 TETRAHEDRON LETT JI Tetrahedron Lett. PD AUG 4 PY 1992 VL 33 IS 32 BP 4521 EP 4524 DI 10.1016/S0040-4039(00)61302-3 PG 4 WC Chemistry, Organic SC Chemistry GA JG832 UT WOS:A1992JG83200001 ER PT J AU JELLISON, GE MCCAMY, JW AF JELLISON, GE MCCAMY, JW TI SAMPLE DEPOLARIZATION EFFECTS FROM THIN-FILMS OF ZNS ON GAAS AS MEASURED BY SPECTROSCOPIC ELLIPSOMETRY SO APPLIED PHYSICS LETTERS LA English DT Article AB Thin films of ZnS grown on GaAs by laser ablation are examined using spectroscopic two-channel polarization modulation ellipsometry (2-C PME). It is found that variations in the film thickness over the illumination spot result in the quasidepolarization of the incident light, which can be measured directly using 2-C PME. Quantitative fits of the ellipsometry data using a distribution-of-thicknesses model agree with independent reflectivity measurements of the thickness gradient, and allow for the accurate determination of the optical functions of the ZnS film. C1 UNIV TENNESSEE,KNOXVILLE,TN 37996. RP JELLISON, GE (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 12 TC 52 Z9 52 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 3 PY 1992 VL 61 IS 5 BP 512 EP 514 DI 10.1063/1.107871 PG 3 WC Physics, Applied SC Physics GA JG157 UT WOS:A1992JG15700004 ER PT J AU GOSSMANN, HJ ASOKAKUMAR, P LEUNG, TC NIELSEN, B LYNN, KG UNTERWALD, FC FELDMAN, LC AF GOSSMANN, HJ ASOKAKUMAR, P LEUNG, TC NIELSEN, B LYNN, KG UNTERWALD, FC FELDMAN, LC TI POINT-DEFECTS IN SI THIN-FILMS GROWN BY MOLECULAR-BEAM EPITAXY SO APPLIED PHYSICS LETTERS LA English DT Article ID IRRADIATED SILICON; TEMPERATURE AB Depth profiles of vacancylike defects have been determined by positron annihilation spectroscopy in 200-nm-thick Si films grown by molecular beam epitaxy on Si(100) substrates at growth temperatures T(growth) = 200-560-degrees-C. The line shape of the radiation emitted from implanted positrons annihilating in the near-surface region of a solid gives quantitative, depth-resolved information on defect concentrations in a nondestructive way. In particular, the method is sensitive to vacancylike defects in a concentration range inaccessible to electron microscopy or ion scattering, but important for electrical device characteristics. The sensitivity limit for these defects in the present experiments is estimated as 5 X 10(15) cm-3 . Films grown at T(growth) greater-than-or-equal-to 475 +/- 20-degrees-C are indistinguishable from virgin wafers. So are samples with T(growth) = 220 +/- 20-degrees-C, subjected to a 2 min, T(RTA) greater than or similar to 500-degrees-C rapid thermal anneal (RTA) after every almost-equal-to 30 nm of Si growth. If T(RTA) = 450 +/-20-degrees-C, part of the film contains a concentration of vacancylike defects on the order of 10(18) cm-3. Our results indicate the importance of the growth parameters, such as temperature and substrate preparation, for the production of high quality films. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP GOSSMANN, HJ (reprint author), AT&T BELL LABS,MURRAY HILL,NJ 07974, USA. RI Nielsen, Bent/B-7353-2009 OI Nielsen, Bent/0000-0001-7016-0040 NR 17 TC 43 Z9 43 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 3 PY 1992 VL 61 IS 5 BP 540 EP 542 DI 10.1063/1.107881 PG 3 WC Physics, Applied SC Physics GA JG157 UT WOS:A1992JG15700014 ER PT J AU WESTBROOK, CK AF WESTBROOK, CK TI THE CHEMISTRY BEHIND ENGINE KNOCK SO CHEMISTRY & INDUSTRY LA English DT Article ID COOL FLAMES; COMBUSTION; OXIDATION; KINETICS RP WESTBROOK, CK (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,POB 808,LIVERMORE,CA 94550, USA. NR 22 TC 8 Z9 8 U1 0 U2 5 PU SOC CHEMICAL INDUSTRY PI LONDON PA 14 BELGRAVE SQUARE, LONDON, ENGLAND SW1X 8PS SN 0009-3068 J9 CHEM IND-LONDON JI Chem. Ind. PD AUG 3 PY 1992 IS 15 BP 562 EP 566 PG 5 WC Chemistry, Applied SC Chemistry GA JG557 UT WOS:A1992JG55700006 ER PT J AU BLOCKI, J BRUT, F SROKOWSKI, T SWIATECKI, WJ AF BLOCKI, J BRUT, F SROKOWSKI, T SWIATECKI, WJ TI THE ORDER TO CHAOS TRANSITION IN AXIALLY SYMMETRICAL NUCLEAR SHAPES SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL WORKSHOP ON DYNAMICAL FLUCTUATIONS AND CORRELATIONS IN NUCLEAR COLLISIONS CY MAR 16-20, 1992 CL AUSSOIS, FRANCE SP COMMISS ENERGIE ATOM, DEPT SCI & MATIERE, CNRS, INST NATL PHYS NUCL & PHYS PARTICULES, CNRS, GRAND ACCELERATEUR NATL IONS LOURDS ID DYNAMICS; RESEPARATION; COALESCENCE; COLLISIONS; SYSTEMS; FUSION AB The transition from order to chaos for independent classical particles moving in variously deformed square well potentials (three-dimensional "billiards") is studied quantitatively by the method of Lyapunov exponents. The billiards or containers are either variously elongated axially symmetric spheroids, spheres rippled according to Legendre Polynomials P2, P3, P4, P5 and P6, or fission-like shapes. The increase of the fractional volume of phase space corresponding to chaotic trajectories is studied as a function of the deviation of the shapes from the sphere. The role of the particle's angular momentum about the symmetry axis in suppressing chaos is demonstrated. C1 INST NUCL STUDIES,PL-05400 OTWOCK,POLAND. INST NUCL PHYS,PL-31342 KRAKOW,POLAND. LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP BLOCKI, J (reprint author), UNIV GRENOBLE 1,INST SCI NUCL,F-38026 ST MARTIN DHERES,FRANCE. NR 27 TC 30 Z9 30 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 3 PY 1992 VL 545 IS 1-2 BP C511 EP C522 PG 12 WC Physics, Nuclear SC Physics GA JK467 UT WOS:A1992JK46700049 ER PT J AU COLONNA, M DITORO, M LATORA, V COLONNA, N AF COLONNA, M DITORO, M LATORA, V COLONNA, N TI FRAGMENTATION IN MEDIUM ENERGY HEAVY-ION COLLISIONS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL WORKSHOP ON DYNAMICAL FLUCTUATIONS AND CORRELATIONS IN NUCLEAR COLLISIONS CY MAR 16-20, 1992 CL AUSSOIS, FRANCE SP COMMISS ENERGIE ATOM, DEPT SCI & MATIERE, CNRS, INST NATL PHYS NUCL & PHYS PARTICULES, CNRS, GRAND ACCELERATEUR NATL IONS LOURDS ID STATISTICAL MULTIFRAGMENTATION; NUCLEAR COLLISIONS; TRANSPORT-THEORY; FLUCTUATIONS; EMISSION; EQUATION; DYNAMICS; MODEL; TIME AB We study equilibrium and non-equilibrium features of complex fragment production in medium energy heavy-ion collisions. We consider first statistical sequential emission from equilibrated primary sources formed in the entrance channel dynamics. The inputs of cascade calculations are derived from a suitable clustering procedure at some carefully fixed equilibration time. Large pre-equilibrium dissipation is revealed. Applications are shown to the reactions La-139 + Al-27 and La-139 + Cu-63 at 55 MeV/u beam energies. Absolute comparisons with experiments show a quite good overall agreement. Some discrepancies, revealed for high multiplicity events and when a larger excitation energy is available, appear as a signature of the onset of a direct multifragmentation mechanism. A microscopic study of the nuclear matter phase diagram in the participant zone clearly shows the relation of this multifragment emission to dynamical instabilities. The dynamical informations on the systems which enter such instability regions are used as inputs for a statistical multifragmentation approach where all possible final partitions are considered with probabilities given by the corresponding entropies. Secondary evaporations are also accounted for. In this way a very good agreement with final Intermediate Mass Fragment (IMF) yields is found. C1 IST NAZL FIS NUCL,S NATL LAB,I-95129 CATANIA,ITALY. LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP COLONNA, M (reprint author), UNIV CATANIA,DEPT PHYS,I-95129 CATANIA,ITALY. NR 29 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 3 PY 1992 VL 545 IS 1-2 BP C111 EP C122 PG 12 WC Physics, Nuclear SC Physics GA JK467 UT WOS:A1992JK46700012 ER PT J AU JACOBS, P BLOOMER, MA ALBRECHT, R AWES, TC BECKMANN, P BERGER, F BOCK, D BOCK, R CLAESSON, G CLEWING, G DEBBE, R DRAGON, L EKLUND, A FERGUSON, RL FOKIN, S FRANZ, A GARPMAN, S GLASOW, R GUSTAFSSON, HA GUTBROD, HH HANSEN, O HARTIG, M HOLKER, G IDH, J IPPOLITOV, M KAMPERT, KH KARADJEV, K KOLB, BW LEBEDEV, A LOHNER, H LUND, I MANKO, V MOSKOWITZ, B OBENSHAIN, FE OSKARSSON, A OTTERLUND, I PEITZMANN, T PLASIL, F POSKANZER, AM PURSCHKE, M RITTER, HG ROTERS, B SAINI, S SANTO, R SCHMIDT, HR SODERSTROM, K SORENSEN, SP STEFFENS, K STEINHAUSER, P STENLUND, E STUKEN, D TWYHUES, A VINOGRADOV, A YOUNG, GR AF JACOBS, P BLOOMER, MA ALBRECHT, R AWES, TC BECKMANN, P BERGER, F BOCK, D BOCK, R CLAESSON, G CLEWING, G DEBBE, R DRAGON, L EKLUND, A FERGUSON, RL FOKIN, S FRANZ, A GARPMAN, S GLASOW, R GUSTAFSSON, HA GUTBROD, HH HANSEN, O HARTIG, M HOLKER, G IDH, J IPPOLITOV, M KAMPERT, KH KARADJEV, K KOLB, BW LEBEDEV, A LOHNER, H LUND, I MANKO, V MOSKOWITZ, B OBENSHAIN, FE OSKARSSON, A OTTERLUND, I PEITZMANN, T PLASIL, F POSKANZER, AM PURSCHKE, M RITTER, HG ROTERS, B SAINI, S SANTO, R SCHMIDT, HR SODERSTROM, K SORENSEN, SP STEFFENS, K STEINHAUSER, P STENLUND, E STUKEN, D TWYHUES, A VINOGRADOV, A YOUNG, GR TI INTERMITTENCY IN 200 GEV/NUCLEON S+S COLLISIONS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL WORKSHOP ON DYNAMICAL FLUCTUATIONS AND CORRELATIONS IN NUCLEAR COLLISIONS CY MAR 16-20, 1992 CL AUSSOIS, FRANCE SP COMMISS ENERGIE ATOM, DEPT SCI & MATIERE, CNRS, INST NATL PHYS NUCL & PHYS PARTICULES, CNRS, GRAND ACCELERATEUR NATL IONS LOURDS ID HIGH-ENERGY COLLISIONS; FLUCTUATIONS; JETS; WA80 AB We have studied one and two-dimensional intermittency in S+S collisions at 200 GeV/nucleon in a high statistics electronic measurement at the CERN SPS using pad-readout streamer tubes. We observe no intermittency signal beyond that produced by folding the Fritiof event generator with a detailed model of our detector. Even though the observed signal contains significant distortions due to experimental effects, we show that we are sensitive to intermittency in the collision. C1 GESELL SCHWERIONENFORSCH GMBH,W-6100 DARMSTADT,GERMANY. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV GRONINGEN,KVI,9747 AA GRONINGEN,NETHERLANDS. UNIV MUNSTER,W-4400 MUNSTER,GERMANY. UNIV LUND,S-22362 LUND,SWEDEN. BROOKHAVEN NATL LAB,UPTON,NY 11973. KURCHATOV INST,MOSCOW 123182,USSR. UNIV TENNESSEE,KNOXVILLE,TN 37996. RP JACOBS, P (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Peitzmann, Thomas/K-2206-2012; Lohner, Herbert/B-2397-2014 OI Peitzmann, Thomas/0000-0002-7116-899X; Lohner, Herbert/0000-0002-7441-739X NR 28 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 3 PY 1992 VL 545 IS 1-2 BP C311 EP C320 PG 10 WC Physics, Nuclear SC Physics GA JK467 UT WOS:A1992JK46700031 ER PT J AU MORETTO, LG TSO, K COLONNA, N WOZNIAK, GJ AF MORETTO, LG TSO, K COLONNA, N WOZNIAK, GJ TI SURFACE INSTABILITIES AND NUCLEAR MULTIFRAGMENTATION SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL WORKSHOP ON DYNAMICAL FLUCTUATIONS AND CORRELATIONS IN NUCLEAR COLLISIONS CY MAR 16-20, 1992 CL AUSSOIS, FRANCE SP COMMISS ENERGIE ATOM, DEPT SCI & MATIERE, CNRS, INST NATL PHYS NUCL & PHYS PARTICULES, CNRS, GRAND ACCELERATEUR NATL IONS LOURDS ID HEAVY-ION COLLISIONS; PHASE-TRANSITION; FRAGMENTATION; EMISSION; EVENTS; MATTER; TIME AB Central heavy-ion collisions, as described by a Boltzman-Nordheim-Vlasov calculation, form nuclear disks that break up into several fragments due to surface instabilities of the Rayleigh-Taylor kind. We demonstrate that a sheet of liquid, nuclear or otherwise, stable in the limit of infinitely sharp surfaces, becomes unstable due to surface-surface interactions. The onset of this instability is determined analytically. The relevance of these instabilities to nuclear multifragmentation is discussed. RP MORETTO, LG (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 21 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 3 PY 1992 VL 545 IS 1-2 BP C237 EP C246 PG 10 WC Physics, Nuclear SC Physics GA JK467 UT WOS:A1992JK46700023 ER PT J AU RANDRUP, J AF RANDRUP, J TI FLUCTUATIONS AND CORRELATIONS IN NUCLEAR ONE-BODY DYNAMICS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL WORKSHOP ON DYNAMICAL FLUCTUATIONS AND CORRELATIONS IN NUCLEAR COLLISIONS CY MAR 16-20, 1992 CL AUSSOIS, FRANCE SP COMMISS ENERGIE ATOM, DEPT SCI & MATIERE, CNRS, INST NATL PHYS NUCL & PHYS PARTICULES, CNRS, GRAND ACCELERATEUR NATL IONS LOURDS ID HEAVY-ION COLLISIONS; TRANSPORT-THEORY; MODEL AB Effective theories of nuclear dynamics must be able to treat trajectory branching at the macroscopic level, a salient feature of nuclear collisions at intermediate energies. Such generalization is possible for Boltzmann-type one-body models. Idealized applications can provide economic model characterizations and thus facilitate model comparisons. C1 LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP RANDRUP, J (reprint author), GESELL SCHWERIONENFORSCH GMBH,W-6100 DARMSTADT 11,GERMANY. NR 19 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 3 PY 1992 VL 545 IS 1-2 BP C47 EP C58 PG 12 WC Physics, Nuclear SC Physics GA JK467 UT WOS:A1992JK46700005 ER PT J AU BROWN, DE ARTHUR, J BARON, AQR BROWN, GS SHASTRI, S AF BROWN, DE ARTHUR, J BARON, AQR BROWN, GS SHASTRI, S TI PHASE-SHIFT OF A ROTATED QUANTUM STATE OBSERVED IN AN X-RAY-SCATTERING EXPERIMENT SO PHYSICAL REVIEW LETTERS LA English DT Article ID NUCLEAR BRAGG-DIFFRACTION; SYNCHROTRON RADIATION; RESONANCE; DECAY AB The rotation of the reference frame of a particle is known to lead to a phase change of its wave function proportional to its angular momentum. This can manifest itself as an angle-dependent phase shift of a photon scattered by a fixed target, when the photon state is an eigenstate of the component of total angular momentum perpendicular to the scattering plane. This phase shift has been observed in the quantum beat pattern resulting from the transient excitation of Fe-57 nuclei by synchrotron radiation. C1 UNIV CALIF SANTA CRUZ,DEPT PHYS,SANTA CRUZ,CA 95064. CORNELL UNIV,CORNELL HIGH ENERGY SYNCHROTRON SOURCE,ITHACA,NY 14853. CORNELL UNIV,SCH APPL & ENGN PHYS,ITHACA,NY 14853. RP BROWN, DE (reprint author), STANFORD SYNCHROTRON RADIAT LAB,POB 4349,BIN 69,STANFORD,CA 94309, USA. NR 25 TC 8 Z9 8 U1 1 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 AUG 3 PY 1992 VL 69 IS 5 BP 699 EP 702 DI 10.1103/PhysRevLett.69.699 PG 4 WC Physics, Multidisciplinary SC Physics GA JG115 UT WOS:A1992JG11500002 ER PT J AU SHI, X SCHRAMM, DN BAHCALL, JN AF SHI, X SCHRAMM, DN BAHCALL, JN TI MONTE-CARLO EXPLORATION OF MIKHEYEV-SMIRNOV-WOLFENSTEIN SOLUTIONS TO THE SOLAR NEUTRINO PROBLEM SO PHYSICAL REVIEW LETTERS LA English DT Article ID OSCILLATIONS; MATTER; MASS; SUN AB We explore the impact of astrophysical uncertainties on the Mikheyev-Smirnov-Wolfenstein (MSW) solution by calculating the allowed MSW solutions for 1000 different solar models with a Monte Carlo selection of solar model input parameters, assuming a full three-family MSW mixing. Applications are made to the chlorine, gallium, Kamiokande, and Borexino experiments. The initial GALLEX result limits the mixing parameters to the upper diagonal and the vertical regions of the MSW triangle. We also calculate the expected event rates in the Borexino experiment assuming the MSW solutions implied by GALLEX. C1 NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. INST ADV STUDY,PRINCETON,NJ 08540. RP SHI, X (reprint author), UNIV CHICAGO,CHICAGO,IL 60637, USA. NR 23 TC 63 Z9 64 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 3 PY 1992 VL 69 IS 5 BP 717 EP 720 DI 10.1103/PhysRevLett.69.717 PG 4 WC Physics, Multidisciplinary SC Physics GA JG115 UT WOS:A1992JG11500007 ER PT J AU ELKHADRA, AX HOCKNEY, G KRONFELD, AS MACKENZIE, PB AF ELKHADRA, AX HOCKNEY, G KRONFELD, AS MACKENZIE, PB TI DETERMINATION OF THE STRONG COUPLING-CONSTANT FROM THE CHARMONIUM SPECTRUM SO PHYSICAL REVIEW LETTERS LA English DT Article ID LATTICE; QCD AB Lattice gauge theory techniques have recently achieved sufficient accuracy to permit a determination of the strong coupling constant from the 1P-1S splitting in the charmonium system, with all systematic errors estimated quantitatively. The present result is alpha(MSBAR)(5 GeV) = 0.174 +/- 0.012, or, equivalently, LAMBDA(MS)/(4) = 160(-37)+47 MeV (MSBAR denotes the modified minimal subtraction scheme). RP ELKHADRA, AX (reprint author), FERMILAB NATL ACCELERATOR LAB,THEORET PHYS GRP,POB 500,BATAVIA,IL 60510, USA. NR 16 TC 152 Z9 152 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 3 PY 1992 VL 69 IS 5 BP 729 EP 732 DI 10.1103/PhysRevLett.69.729 PG 4 WC Physics, Multidisciplinary SC Physics GA JG115 UT WOS:A1992JG11500010 ER PT J AU ATIYA, MS CHIANG, IH FRANK, JS HAGGERTY, JS ITO, MM KYCIA, TF LI, KK LITTENBERG, LS STEVENS, AJ SAMBAMURTI, A STRAND, RC LOUIS, WC AKERIB, DS MARLOW, DR MEYERS, PD SELEN, MA SHOEMAKER, FC SMITH, AJS BLACKMORE, EW BRYMAN, DA FELAWKA, L KITCHING, P KONAKA, A KUNO, Y MACDONALD, JA NUMAO, T PADLEY, P POUTISSOU, JM POUTISSOU, R ROY, J TURCOT, AS AF ATIYA, MS CHIANG, IH FRANK, JS HAGGERTY, JS ITO, MM KYCIA, TF LI, KK LITTENBERG, LS STEVENS, AJ SAMBAMURTI, A STRAND, RC LOUIS, WC AKERIB, DS MARLOW, DR MEYERS, PD SELEN, MA SHOEMAKER, FC SMITH, AJS BLACKMORE, EW BRYMAN, DA FELAWKA, L KITCHING, P KONAKA, A KUNO, Y MACDONALD, JA NUMAO, T PADLEY, P POUTISSOU, JM POUTISSOU, R ROY, J TURCOT, AS TI SEARCH FOR THE DECAY PI-0 -] GAMMA+X SO PHYSICAL REVIEW LETTERS LA English DT Article ID PARTICLES; CHARGE; LIMIT; MASS AB A search for the decay pi-0 --> gamma-X, where X is any long-lived weakly interacting neutral vector particle with mass smaller than the neutral pion mass, was performed using neutral pions tagged by K+ --> pi+pi-0 A 90%-C.L. upper limit for the branching ratio of the two-body decay B(pi-0 --> gamma-X) < 5 x 10(-4) is set. Limits are also set for three-body decays pi-0 --> gamma-XX'. C1 LOS ALAMOS NATL LAB,DIV MEDIUM ENERGY PHYS,LOS ALAMOS,NM 87545. PRINCETON UNIV,JOSEPH HENRY LABS,PRINCETON,NJ 08544. TRIUMF,VANCOUVER V6T 2A3,BC,CANADA. RP ATIYA, MS (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Marlow, Daniel/C-9132-2014; OI Littenberg, Laurence/0000-0001-8373-7179 NR 17 TC 23 Z9 23 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 3 PY 1992 VL 69 IS 5 BP 733 EP 736 DI 10.1103/PhysRevLett.69.733 PG 4 WC Physics, Multidisciplinary SC Physics GA JG115 UT WOS:A1992JG11500011 ER PT J AU ADAMOVICH, MI AGGARWAL, MM ALEXANDROV, YA ANDREEVA, NP ANZON, ZV ARORA, R AVETYAN, FA BADYAL, SK BASOVA, E BHALLA, KB BHASIN, A BHATIA, VS BOGDANOV, VG BUBNOV, VI BURNETT, TH CAI, X CHASNIKOV, IY CHERNOVA, LP CHERNYAVSKY, MM ELIGBAEVA, GZ EREMENKO, LE GAITINOV, AS GANSSAUGE, ER GARPMAN, S GERASSIMOV, SG GROTE, J GULAMOV, KG GUPTA, SK GUPTA, VK HECKMAN, HH HUANG, H JAKOBSSON, B JUDEK, B JUST, L KACHROO, S KALYACHKINA, GS KANYGINA, EK KARABOVA, M KAUL, GL KITROO, S KHARLAMOV, SP KRASNOV, SA KULIKOVA, S KUMAR, V LAL, P LARIONOVA, VG LEPETAN, VN LIU, LS LOKANATHAN, S LORD, J LUKICHEVA, NS LUO, SB MAKSIMKINA, TN MANGOTRA, LK MARUTYAN, NA MASLENNIKOVA, NV MITTRA, IS MOOKERJEE, S NASRULAEVA, H NASYROV, SH NAVOTNY, VS NYSTRAND, J ORLOVA, GI OTTERLUND, I PALSANIA, HS PERESADKO, NG PETROV, NV PLYUSHCHEV, VA QARSHIEV, DA QIAN, WY QIN, YM RANIWALA, R RANIWALA, S RAO, NK RAPPOPORT, VM RHEE, JT SAIDKHANOV, N SALMANOVA, NA SARKISOVA, LG SARKISYAN, VR SHABRATOVA, GS SHAKHOVA, TI SHPILEV, SN SKELDING, D SODERSTROM, K SOLOVJEVA, ZI STENLUND, E SURIN, EL SVECHNIKOVA, LN TOLSTOV, KD TOTHOVA, M TRETYAKOVA, MI TROFIMOVA, TP TULEEVA, U VOKAL, S WANG, HQ WENG, ZQ WILKES, RJ XIA, YL XU, GF ZHANG, DH ZHENG, PY ZHOKHOVA, SI ZHOU, DC AF ADAMOVICH, MI AGGARWAL, MM ALEXANDROV, YA ANDREEVA, NP ANZON, ZV ARORA, R AVETYAN, FA BADYAL, SK BASOVA, E BHALLA, KB BHASIN, A BHATIA, VS BOGDANOV, VG BUBNOV, VI BURNETT, TH CAI, X CHASNIKOV, IY CHERNOVA, LP CHERNYAVSKY, MM ELIGBAEVA, GZ EREMENKO, LE GAITINOV, AS GANSSAUGE, ER GARPMAN, S GERASSIMOV, SG GROTE, J GULAMOV, KG GUPTA, SK GUPTA, VK HECKMAN, HH HUANG, H JAKOBSSON, B JUDEK, B JUST, L KACHROO, S KALYACHKINA, GS KANYGINA, EK KARABOVA, M KAUL, GL KITROO, S KHARLAMOV, SP KRASNOV, SA KULIKOVA, S KUMAR, V LAL, P LARIONOVA, VG LEPETAN, VN LIU, LS LOKANATHAN, S LORD, J LUKICHEVA, NS LUO, SB MAKSIMKINA, TN MANGOTRA, LK MARUTYAN, NA MASLENNIKOVA, NV MITTRA, IS MOOKERJEE, S NASRULAEVA, H NASYROV, SH NAVOTNY, VS NYSTRAND, J ORLOVA, GI OTTERLUND, I PALSANIA, HS PERESADKO, NG PETROV, NV PLYUSHCHEV, VA QARSHIEV, DA QIAN, WY QIN, YM RANIWALA, R RANIWALA, S RAO, NK RAPPOPORT, VM RHEE, JT SAIDKHANOV, N SALMANOVA, NA SARKISOVA, LG SARKISYAN, VR SHABRATOVA, GS SHAKHOVA, TI SHPILEV, SN SKELDING, D SODERSTROM, K SOLOVJEVA, ZI STENLUND, E SURIN, EL SVECHNIKOVA, LN TOLSTOV, KD TOTHOVA, M TRETYAKOVA, MI TROFIMOVA, TP TULEEVA, U VOKAL, S WANG, HQ WENG, ZQ WILKES, RJ XIA, YL XU, GF ZHANG, DH ZHENG, PY ZHOKHOVA, SI ZHOU, DC TI RAPIDITY DENSITY DISTRIBUTIONS IN O-16, SI-28, S-32, AU-197, AND PB-208 INDUCED HEAVY-ION INTERACTIONS AT 4A-200A GEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID INDUCED EMULSION INTERACTIONS; TRANSVERSE ENERGY; 200 GEV/NUCLEON; COLLISIONS; MULTIPLICITY; PARTICLE AB The mass, energy, and centrality dependence of rapidity density distributions of relativistic, charged particles, produced in heavy-ion interactions in the energy range 4A-200A GeV, are investigated. The results indicate that the rapidity density distributions show systematic variations, which are used to predict distributions for Au + Au and Pb + Pb interactions in a model-independent way. C1 ALMA ATA HIGH ENERGY PHYS INST,ALMA ATA,KAZAKHSTAN,KAZAKHSTAN. CHINESE ACAD SCI,BEIJING,PEOPLES R CHINA. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. PANJAB UNIV,CHANDIGARH 160014,INDIA. HUNAN EDUC INST,CHANGSHA,PEOPLES R CHINA. DUBNA JOINT NUCL RES INST,DUBNA,RUSSIA. UNIV RAJASTHAN,JAIPUR 302004,RAJASTHAN,INDIA. UNIV JAMMU,JAMMU 180001,INDIA. SAFARIK UNIV,CS-04180 KOSICE,SLOVAKIA. SHANXI NORMAL UNIV,LINFEN,PEOPLES R CHINA. LUND UNIV,S-22101 LUND,SWEDEN. UNIV MARBURG,W-3550 MARBURG,GERMANY. NATL RES COUNCIL CANADA,OTTAWA K1A 0R6,ONTARIO,CANADA. VG KHLOPIN RADIUM INST,ST PETERSBURG,RUSSIA. UNIV WASHINGTON,SEATTLE,WA 98195. TASHKENT NUCL PHYS INST,TASHKENT,UZBEKISTAN,UZBEKISTAN. TASHKENT PHYS TECH INST,TASHKENT,UZBEKISTAN,UZBEKISTAN. HUA ZHONG NORMAL UNIV,WUHAN,PEOPLES R CHINA. YEREVAN PHYS INST,YEREVAN,ARMENIA,ARMENIA. RP ADAMOVICH, MI (reprint author), PN LEBEDEV INST,MOSCOW,RUSSIA. RI Wilkes, R.Jeffrey/E-6011-2013; Gerassimov, Sergei/M-8779-2015; Kharlamov, Sergei/M-9612-2015; Peresadko, Natalia/M-9585-2015; Chernyavsky, Mikhail/H-7909-2014 NR 12 TC 30 Z9 31 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 AUG 3 PY 1992 VL 69 IS 5 BP 745 EP 748 DI 10.1103/PhysRevLett.69.745 PG 4 WC Physics, Multidisciplinary SC Physics GA JG115 UT WOS:A1992JG11500014 ER PT J AU RAX, JM FISCH, NJ AF RAX, JM FISCH, NJ TI 3RD-HARMONIC GENERATION WITH ULTRAHIGH-INTENSITY LASER-PULSES SO PHYSICAL REVIEW LETTERS LA English DT Article ID PLASMAS AB When an intense, plane-polarized, laser pulse interacts with a plasma, the relativistic nonlinearities induce a third-harmonic polarization. A phase-locked growth of a third-harmonic wave can take place, but the difference between the nonlinear dispersion of the pump and driven waves leads to a rapid unlocking, resulting in a saturation. What become third-harmonic amplitude oscillations are identified here, and the nonlinear phase velocity and the renormalized electron mass due to plasmon screening are calculated. A simple phase-matching scheme, based on a resonant density modulation, is then proposed and analyzed. C1 CEN CADARACHE,CEA,EURATOM,F-13108 ST PAUL DURANCE,FRANCE. RP RAX, JM (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. NR 18 TC 69 Z9 69 U1 1 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 3 PY 1992 VL 69 IS 5 BP 772 EP 775 DI 10.1103/PhysRevLett.69.772 PG 4 WC Physics, Multidisciplinary SC Physics GA JG115 UT WOS:A1992JG11500021 ER PT J AU BELLINI, T CLARK, NA MUZNY, CD WU, L GARLAND, CW SCHAEFER, DW OLIVIER, BJ OLIVER, BJ AF BELLINI, T CLARK, NA MUZNY, CD WU, L GARLAND, CW SCHAEFER, DW OLIVIER, BJ OLIVER, BJ TI PHASE-BEHAVIOR OF THE LIQUID-CRYSTAL 8CB IN A SILICA AEROGEL SO PHYSICAL REVIEW LETTERS LA English DT Article ID SMECTIC-A TRANSITION; OCTYLCYANOBIPHENYL 8CB; CRITICAL-POINT; HEAT-CAPACITY; SCATTERING; DEPENDENCE; SYSTEMS; LINE AB Light scattering and precision calorimetry show that the nematic ordering of octylcyanobiphenyl (8CB) filling the connected network of pores of a silica aerogel does not occur via the first-order phase transition characteristic of the bulk. Rather, ordering is continuous with an orientational correlation length never increasing beyond the aerogel pore size. The heat-capacity anomaly of the second-order nematic-smectic-A phase transition seen in the bulk is absent or greatly broadened in the aerogel. C1 MIT,DEPT CHEM,CAMBRIDGE,MA 02139. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP BELLINI, T (reprint author), UNIV COLORADO,DEPT PHYS,CONDENSED MATTER LAB,BOULDER,CO 80309, USA. RI Clark, Noel/E-9011-2010; Bellini, Tommaso/M-5510-2014 OI Bellini, Tommaso/0000-0003-4898-4400 NR 26 TC 198 Z9 198 U1 0 U2 27 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 AUG 3 PY 1992 VL 69 IS 5 BP 788 EP 791 DI 10.1103/PhysRevLett.69.788 PG 4 WC Physics, Multidisciplinary SC Physics GA JG115 UT WOS:A1992JG11500025 ER PT J AU CLAESSEN, R ANDERSON, RO ALLEN, JW OLSON, CG JANOWITZ, C ELLIS, WP HARM, S KALNING, M MANZKE, R SKIBOWSKI, M AF CLAESSEN, R ANDERSON, RO ALLEN, JW OLSON, CG JANOWITZ, C ELLIS, WP HARM, S KALNING, M MANZKE, R SKIBOWSKI, M TI FERMI-LIQUID LINE-SHAPES MEASURED BY ANGLE-RESOLVED PHOTOEMISSION SPECTROSCOPY ON 1-T-TITE2 SO PHYSICAL REVIEW LETTERS LA English DT Article ID BAND-STRUCTURE; NORMAL-STATE; DICHALCOGENIDES; SURFACE AB We have performed high-resolution angle-resolved photoemission spectroscopy (ARPES) on the layered compound 1-T-TiTe2, whose low-energy properties are those of a normal metal, and analyzed the experimental line shapes in terms of the Fermi-liquid self-energy. We find excellent agreement between the measured and theoretical spectral weight distribution, while line profiles expected for other theoretical models such as the marginal Fermi liquid clearly fail to reproduce the experimental spectra. This demonstrates that ARPES line shapes are able to reflect the nature of an interacting electron system. C1 IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. AMES LAB,AMES,IA 50011. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. CHRISTIAN ALBRECHTS UNIV KIEL,INST EXPTL PHYS,W-2300 KIEL 1,GERMANY. RP CLAESSEN, R (reprint author), UNIV MICHIGAN,RANDALL LAB PHYS,ANN ARBOR,MI 48109, USA. RI Claessen, Ralph/A-2045-2017 OI Claessen, Ralph/0000-0003-3682-6325 NR 14 TC 82 Z9 82 U1 5 U2 28 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 AUG 3 PY 1992 VL 69 IS 5 BP 808 EP 811 DI 10.1103/PhysRevLett.69.808 PG 4 WC Physics, Multidisciplinary SC Physics GA JG115 UT WOS:A1992JG11500030 ER PT J AU MILLER, SL FLEETWOOD, DM MCWHORTER, PJ AF MILLER, SL FLEETWOOD, DM MCWHORTER, PJ TI DETERMINING THE ENERGY-DISTRIBUTION OF TRAPS IN INSULATING THIN-FILMS USING THE THERMALLY STIMULATED CURRENT TECHNIQUE SO PHYSICAL REVIEW LETTERS LA English DT Article ID SEMICONDUCTORS; TRANSISTORS; ENVIRONMENT AB We have developed a simple method to analyze and predict the thermally stimulated current (TSC) of charged insulating thin films experiencing arbitrary time-dependent thermal environments and high electric fields. The method allows greater flexibility in experimental conditions than previous work, and includes the effect of field-induced barrier lowering on the trap energy scale. Trap distributions for irradiated metal-SiO2-Si capacitors were accurately determined from TSC measurements spanning a factor of 50 in heating rate, providing an improved estimate of trapped-hole energies in SiO2 (peak approximately 1.8 eV). RP MILLER, SL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 20 TC 37 Z9 37 U1 0 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 3 PY 1992 VL 69 IS 5 BP 820 EP 823 DI 10.1103/PhysRevLett.69.820 PG 4 WC Physics, Multidisciplinary SC Physics GA JG115 UT WOS:A1992JG11500033 ER PT J AU WELP, U FLESHLER, S KWOK, WK CRABTREE, GW CARLSON, KD WANG, HH GEISER, U WILLIAMS, JM HITSMAN, VM AF WELP, U FLESHLER, S KWOK, WK CRABTREE, GW CARLSON, KD WANG, HH GEISER, U WILLIAMS, JM HITSMAN, VM TI WEAK FERROMAGNETISM IN KAPPA-(ET)2CU[N(CN)2]CL, WHERE ET IS BIS(ETHYLENEDITHIO)TETRATHIAFULVALENE SO PHYSICAL REVIEW LETTERS LA English DT Article ID KAPPA-(BEDT-TTF)2CUCL; SUPERCONDUCTIVITY; TRANSITION AB Magnetization measurements at ambient pressure on kappa-(ET)2Cu[N(CN)2]Cl, an organic salt that is superconducting under pressure (T(c) = 12.8 K at 0.3 kbar), reveal an antiferromagnetic transition near 45 K and, for the first time in this class of materials, a transition near 22 K to a state displaying weak ferromagnetic hysteresis with a saturation moment of (8 x 10(-4)mu-B/formula. This low-temperature state is characterized by a sequence of first-order magnetization jumps. C1 ALMA COLL,DEPT CHEM,ALMA,MI 48801. PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907. ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCTIV,DIV MAT SCI,ARGONNE,IL 60439. RP WELP, U (reprint author), ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCTIV,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 26 TC 135 Z9 135 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 AUG 3 PY 1992 VL 69 IS 5 BP 840 EP 843 DI 10.1103/PhysRevLett.69.840 PG 4 WC Physics, Multidisciplinary SC Physics GA JG115 UT WOS:A1992JG11500038 ER PT J AU CHAU, LL YU, Y AF CHAU, LL YU, Y TI UNITARY POLYNOMIALS IN NORMAL MATRIX MODELS AND WAVE-FUNCTIONS FOR THE FRACTIONAL QUANTUM HALL-EFFECTS SO PHYSICS LETTERS A LA English DT Article ID RANDOM SURFACES; ONE DIMENSION; GRAVITY; STATES; STATISTICS; HIERARCHY; STRINGS; DEGENERACY; FLUID; LESS AB We formulate matrix models with random interactions from normal matrices and construct the corresponding unitary polynomials. The unitary polynomials can be viewed as a set of one-body wave functions of a two-dimensional repulsive Coulomb gas of particles. We then construct the N-body ground state wave functions from these unitary polynomials according to symmetry and statistics requirements. Interestingly, in the case of the zero matrix-model random interaction we precisely obtain the Laughlin wave functions for the fractional quantum Hall effect. In the case of the nonzero matrix-model random interactions, we demonstrate that the N-body wave functions obtained from our normal matrix model describe electrons on a plane under the influence of nonuniform external electromagnetic fields. Thus, our solutions from the normal matrix model show that fractional quantum Hall effects do exist in complex situations of external electromagnetic fields. It will be interesting to observe such fractional quantum Hall effects experimentally. C1 LOS ALAMOS NATL LAB,CTR NON LINEAR STUDIES,LOS ALAMOS,NM 87545. ACAD SINICA,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA. RP CHAU, LL (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. NR 34 TC 17 Z9 17 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD AUG 3 PY 1992 VL 167 IS 5-6 BP 452 EP 458 PG 7 WC Physics, Multidisciplinary SC Physics GA JF997 UT WOS:A1992JF99700005 ER PT J AU KATTI, AM DIACK, M ELFALLAH, MZ GOLSHANSHIRAZI, S JACOBSON, SC SEIDELMORGENSTERN, A GUIOCHON, G AF KATTI, AM DIACK, M ELFALLAH, MZ GOLSHANSHIRAZI, S JACOBSON, SC SEIDELMORGENSTERN, A GUIOCHON, G TI PREDICTION OF HIGH-CONCENTRATION BAND PROFILES IN LIQUID-CHROMATOGRAPHY SO ACCOUNTS OF CHEMICAL RESEARCH LA English DT Review ID OVERLOADED ELUTION PROFILES; ISOTHERM; BINARY; MODEL C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. OI Seidel-Morgenstern, Andreas/0000-0001-8595-7810 NR 26 TC 13 Z9 13 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0001-4842 J9 ACCOUNTS CHEM RES JI Accounts Chem. Res. PD AUG PY 1992 VL 25 IS 8 BP 366 EP 374 DI 10.1021/ar00020a007 PG 9 WC Chemistry, Multidisciplinary SC Chemistry GA JJ633 UT WOS:A1992JJ63300007 ER PT J AU OBERKAMPF, WL AESCHLIMAN, DP AF OBERKAMPF, WL AESCHLIMAN, DP TI JOINT COMPUTATIONAL EXPERIMENTAL AERODYNAMICS RESEARCH ON A HYPERSONIC VEHICLE .1. EXPERIMENTAL RESULTS SO AIAA JOURNAL LA English DT Article AB Aerodynamic force and moment measurements and flow visualization results are presented for a hypersonic vehicle configuration at Mach 8. All of the experimental results were obtained in the Sandia National Laboratories Mach 8 hypersonic wind tunnel for laminar boundary-layer conditions. The basic vehicle configuration is a spherically blunted 10-deg half-angle cone with a slice parallel with the axis of the vehicle. On the slice portion of the vehicle, a flap can be attached so that deflection angles of 10, 20, and 30 deg can be obtained. Surface flow visualization showed separated flow in front of each flap configuration. A detailed uncertainly analysis was conducted to estimate the contributors to body force and moment measurement uncertainty. In this paper, comparisons are made with computational results to evaluate both the experimental and numerical results. This extensive set of high-quality experimental force and moment measurements is recommended for use in the calibration and validation of relevant computational aerodynamics codes. RP OBERKAMPF, WL (reprint author), SANDIA NATL LABS,DEPT AEROD YNAM,ORG 1554,ALBUQUERQUE,NM 87185, USA. NR 10 TC 10 Z9 11 U1 0 U2 4 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0001-1452 J9 AIAA J JI AIAA J. PD AUG PY 1992 VL 30 IS 8 BP 2000 EP 2009 DI 10.2514/3.11172 PG 10 WC Engineering, Aerospace SC Engineering GA JG675 UT WOS:A1992JG67500009 ER PT J AU WALKER, MM OBERKAMPF, WL AF WALKER, MM OBERKAMPF, WL TI JOINT COMPUTATIONAL EXPERIMENTAL AERODYNAMICS RESEARCH ON A HYPERSONIC VEHICLE .2. COMPUTATIONAL RESULTS SO AIAA JOURNAL LA English DT Article ID STOKES AB Parabolized and iterative Navier-Stokes codes are used to predict flowfield solutions around a hypersonic vehicle. Aerodynamic force and moment predictions from the codes are compared with experimental data from the Sandia National Laboratories Mach 8 wind tunnel. The comparisons are made on a spherically blunted cone with a slice parallel to the body axis. On the slice portion of the vehicle, a flap can be attached so that deflection angles of 10, 20, and 30 deg can be obtained. The Sandia parabolized Navier-Stokes code is used to generate solutions for the sliced vehicle with no flap. For the vehicle with a flap, axially separated flow occurs, and a time iterative Navier-Stokes code is used to provide comparisons with the data. Aerodynamic force and moment comparisons are made for laminar flow, and an ideal gas is assumed in the calculations. A detailed study of grid convergence is presented to determine the accuracy of the numerical solutions. Predictions obtained from the codes show very good agreement with the experimental data for force and moment coefficients, except for large flap deflections. C1 SANDIA NATL LABS,DEPT AERODYNAM,ALBUQUERQUE,NM 87185. RP WALKER, MM (reprint author), SANDIA NATL LABS,DEPT COMPUTAT FLUID DYNAM,ALBUQUERQUE,NM 87185, USA. NR 19 TC 10 Z9 10 U1 0 U2 3 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0001-1452 J9 AIAA J JI AIAA J. PD AUG PY 1992 VL 30 IS 8 BP 2010 EP 2016 DI 10.2514/3.11173 PG 7 WC Engineering, Aerospace SC Engineering GA JG675 UT WOS:A1992JG67500010 ER PT J AU AMATUCCI, VA DUTTON, JC KUNTZ, DW ADDY, AL AF AMATUCCI, VA DUTTON, JC KUNTZ, DW ADDY, AL TI 2-STREAM, SUPERSONIC, WAKE FLOWFIELD BEHIND A THICK BASE .1. GENERAL FEATURES SO AIAA JOURNAL LA English DT Article ID TURBULENT BOUNDARY-LAYER; ADVERSE PRESSURE-GRADIENT; FREE SHEAR LAYERS; KINETIC ENERGY; MIXING LAYER; FLOW; REATTACHMENT; DOWNSTREAM AB An experimental investigation of the complex interaction region generated by the separation of two supersonic streams past a finite-thickness base has been conducted in a two-dimensional wind tunnel. The data were obtained using schlieren photography, pressure measurements, and two-component laser Doppler velocimeter measurements. The shear-layer mixing regions are characterized by initially constant-pressure mixing, by an evolution of velocity profiles from truncated boundary-layer shapes to wakelike profiles farther downstream, and by relatively high levels of turbulence. The separated flow region is characterized by large reverse flow velocities and strong interactions with the low-velocity regions of both shear layers. Turbulence intensities and kinematic Reynolds stresses are strongly affected by the separation process at the base and increase greatly in the latter portions of the two shear layers and in the recompression region. Recovery of the mean velocity field in the redeveloping wake occurs quickly, while the turbulence field remains perturbed to the fastest streamwise location investigated. C1 UNIV ILLINOIS,DEPT MECH & IND ENGN,URBANA,IL 61801. RP AMATUCCI, VA (reprint author), SANDIA NATL LABS,DEPT THERMOPHYS,ALBUQUERQUE,NM 87185, USA. NR 36 TC 22 Z9 24 U1 1 U2 3 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0001-1452 J9 AIAA J JI AIAA J. PD AUG PY 1992 VL 30 IS 8 BP 2039 EP 2046 DI 10.2514/3.11177 PG 8 WC Engineering, Aerospace SC Engineering GA JG675 UT WOS:A1992JG67500014 ER PT J AU AVRAMIDIS, S ENGLEZOS, P PAPATHANASIOU, T AF AVRAMIDIS, S ENGLEZOS, P PAPATHANASIOU, T TI DYNAMIC NONISOTHERMAL TRANSPORT IN HYGROSCOPIC POROUS-MEDIA - MOISTURE DIFFUSION IN WOOD SO AICHE JOURNAL LA English DT Article ID NON-ISOTHERMAL DIFFUSION; MASS-TRANSFER; BOUND WATER; DRIVING FORCE; ABSORPTION; HEAT; MODEL; SIMULATION; MOVEMENT; LUMBER AB A model that predicts heat and moisture transfer in the hygroscopic range of a complex porous material such as wood, was evaluated with unsteady-state nonisothermal diffusion experimental data. Water chemical potential gradient was taken as the driving force for diffusion, and the derivation of the temperature-gradient phenomenological coefficient in the mass balance equation was based on the principles of nonequilibrium thermodynamics. The results reveal an excellent prediction of the specimen's average moisture content during desorption in the hygroscopic range. Moreover, a very good agreement was also shown between the specimen's center temperature and the model predictions. The model revealed the existence of a thermal-diffusion phenomenon during the initial stages of the desorption process. This phenomenon was not predicted by Fick's equation for diffusion. C1 UNIV BRITISH COLUMBIA,DEPT CHEM ENGN,CTR PULP & PAPER,VANCOUVER V6T 1Z4,BC,CANADA. LOS ALAMOS NATL LAB,DIV MECH & ELECTR ENGN,LOS ALAMOS,NM 87545. RP AVRAMIDIS, S (reprint author), UNIV BRITISH COLUMBIA,DEPT HARVESTING & WOOD SCI,VANCOUVER V6T 1Z4,BC,CANADA. OI Avramidis, Stavros/0000-0003-1517-716X; Englezos, Peter/0000-0003-1569-4626 NR 56 TC 17 Z9 17 U1 0 U2 5 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 AUG PY 1992 VL 38 IS 8 BP 1279 EP 1287 DI 10.1002/aic.690380813 PG 9 WC Engineering, Chemical SC Engineering GA JM121 UT WOS:A1992JM12100012 ER PT J AU MYERS, G LENROOT, R AF MYERS, G LENROOT, R TI HIV GLYCOSYLATION - WHAT DOES IT PORTEND SO AIDS RESEARCH AND HUMAN RETROVIRUSES LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON ADVANCES IN AIDS VACCINE DEVELOPMENT / 4TH ANNUAL MEETING OF THE NATIONAL COOPERATIVE VACCINE DEVELOPMENT GROUP FOR AIDS CY OCT 15-19, 1991 CL MARCO ISLAND, FL SP NATL COOPERAT VACCINE DEV GRP AIDS RP MYERS, G (reprint author), LOS ALAMOS NATL LAB,HIV SEQUENCE DATABASE,LOS ALAMOS,NM 87545, USA. NR 0 TC 32 Z9 32 U1 0 U2 2 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0889-2229 J9 AIDS RES HUM RETROV JI Aids Res. Hum. Retrovir. PD AUG PY 1992 VL 8 IS 8 BP 1459 EP 1460 PG 2 WC Immunology; Infectious Diseases; Virology SC Immunology; Infectious Diseases; Virology GA JR904 UT WOS:A1992JR90400047 PM 1466982 ER PT J AU KORBER, B WOLINSKY, S HAYNES, B KUNSTMAN, K LEVY, R FURTADO, M OTTO, P MYERS, G AF KORBER, B WOLINSKY, S HAYNES, B KUNSTMAN, K LEVY, R FURTADO, M OTTO, P MYERS, G TI HIV-1 INTRAPATIENT SEQUENCE DIVERSITY IN THE IMMUNOGENIC V3 REGION SO AIDS RESEARCH AND HUMAN RETROVIRUSES LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON ADVANCES IN AIDS VACCINE DEVELOPMENT / 4TH ANNUAL MEETING OF THE NATIONAL COOPERATIVE VACCINE DEVELOPMENT GROUP FOR AIDS CY OCT 15-19, 1991 CL MARCO ISLAND, FL SP NATL COOPERAT VACCINE DEV GRP AIDS ID HUMAN-IMMUNODEFICIENCY-VIRUS; BROADLY NEUTRALIZING ANTIBODIES; DETERMINANT; TYPE-1 C1 NORTHWESTERN UNIV,SCH MED,DEPT MED,CHICAGO,IL 60611. DUKE UNIV,MED CTR,DEPT MED,DURHAM,NC 27710. NORTHWESTERN UNIV,SCH MED,DEPT NEUROSURG,CHICAGO,IL 60611. RP KORBER, B (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,T-10,MS K710,LOS ALAMOS,NM 87545, USA. RI Wolinsky, Steven/B-2893-2012; OI Wolinsky, Steven/0000-0002-9625-6697; Korber, Bette/0000-0002-2026-5757 NR 8 TC 33 Z9 33 U1 0 U2 0 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0889-2229 J9 AIDS RES HUM RETROV JI Aids Res. Hum. Retrovir. PD AUG PY 1992 VL 8 IS 8 BP 1461 EP 1465 PG 5 WC Immunology; Infectious Diseases; Virology SC Immunology; Infectious Diseases; Virology GA JR904 UT WOS:A1992JR90400048 PM 1281659 ER PT J AU SHIOTSUKA, RN KUTZMAN, RS FIRRIOLO, JM DREW, RT AF SHIOTSUKA, RN KUTZMAN, RS FIRRIOLO, JM DREW, RT TI USE OF FLUIDIZING BED AEROSOL GENERATORS TO ESTABLISH A DUST MIXTURE OF 2 SUBSTANCES AT A FIXED-RATIO FOR INHALATION TOXICITY STUDIES SO AMERICAN INDUSTRIAL HYGIENE ASSOCIATION JOURNAL LA English DT Article ID OPERATION AB A method was developed to use two fluidizing bed generators to deliver a mixture of 1 mg cobalt + 15 mg tungsten carbide/m3 to an inhalation exposure chamber with the output from the cobalt generator split to provide the same cobalt concentration to a cobalt-only chamber. To provide a more uniform delivery of material and to minimize the amount of starting dust needed, a subsystem that produced timed bursts of compressed air was used to prevent the accumulation of dust along the aerosol transport tubes. The addition of an electrostatic precipitator placed in the exhaust lines reduced the amount of dust delivered to the high-efficiency particulate air filters, thereby reducing the number of filter changes. RP SHIOTSUKA, RN (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. NR 6 TC 2 Z9 3 U1 0 U2 1 PU AMER INDUSTRIAL HYGIENE ASSOC PI FAIRFAX PA 2700 PROSPERITY AVE #250, FAIRFAX, VA 22031-4307 SN 0002-8894 J9 AM IND HYG ASSOC J JI Am. Ind. Hyg. Assoc. J. PD AUG PY 1992 VL 53 IS 8 BP 510 EP 513 PG 4 WC Environmental Sciences; Public, Environmental & Occupational Health SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health GA JG530 UT WOS:A1992JG53000007 PM 1509991 ER PT J AU FIX, JJ GILBERT, ES WILSON, RH BAUMGARTNER, WV NICHOLS, LL AF FIX, JJ GILBERT, ES WILSON, RH BAUMGARTNER, WV NICHOLS, LL TI EVIDENCE OF BIASED RECORDING OF RADIATION-DOSES OF HANFORD WORKERS - COMMENT SO AMERICAN JOURNAL OF INDUSTRIAL MEDICINE LA English DT Letter DE IONIZING RADIATION; DOSIMETRY; BIASES IN EPIDEMIOLOGY; HANFORD NUCLEAR WORKERS RP FIX, JJ (reprint author), PACIFIC NW LAB, MS P7-82, POB 999, RICHLAND, WA 99352 USA. NR 6 TC 3 Z9 3 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0271-3586 J9 AM J IND MED JI Am. J. Ind. Med. PD AUG PY 1992 VL 22 IS 2 BP 281 EP 283 DI 10.1002/ajim.4700220217 PG 3 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA JD718 UT WOS:A1992JD71800016 PM 1415297 ER PT J AU CRAWFORD, FS AF CRAWFORD, FS TI SPEED OF GRAVITY-WAVES IN DEEP-WATER - ANOTHER ELEMENTARY DERIVATION SO AMERICAN JOURNAL OF PHYSICS LA English DT Note C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP CRAWFORD, FS (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0002-9505 J9 AM J PHYS JI Am. J. Phys. PD AUG PY 1992 VL 60 IS 8 BP 751 EP 752 DI 10.1119/1.17083 PG 2 WC Education, Scientific Disciplines; Physics, Multidisciplinary SC Education & Educational Research; Physics GA JF308 UT WOS:A1992JF30800011 ER PT J AU SESSLER, AM AF SESSLER, AM TI ACCELERATOR BEAM EMITTANCE SO AMERICAN JOURNAL OF PHYSICS LA English DT Note RP SESSLER, AM (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 2 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0002-9505 J9 AM J PHYS JI Am. J. Phys. PD AUG PY 1992 VL 60 IS 8 BP 760 EP 762 DI 10.1119/1.17088 PG 3 WC Education, Scientific Disciplines; Physics, Multidisciplinary SC Education & Educational Research; Physics GA JF308 UT WOS:A1992JF30800017 ER PT J AU ZALLER, J FELDMAN, S AF ZALLER, J FELDMAN, S TI A SIMPLE THEORY OF THE SURVEY RESPONSE - ANSWERING QUESTIONS VERSUS REVEALING PREFERENCES SO AMERICAN JOURNAL OF POLITICAL SCIENCE LA English DT Article ID ATTITUDE BEHAVIOR RELATION; OPINION; CONSISTENCY; ELECTION; MEMORY; MODEL AB Opinion research is beset by two major types of "artifactual" variance: huge amounts of overtime response instability and the common tendency for seemingly trivial changes in questionnaire form to affect the expression of attitudes. We propose a simple model that converts this anomalous "error variance" into sources of substantive insight into the nature of public opinion, The model abandons the conventional but implausible notion that most people possess opinions at the level of specificity of typical survey items-and instead assumes that most people are internally conflicted over most political issues-and that most respond to survey questions on the basis of whatever ideas are at the top of their heads at the moment of answering. Numerous empirical regularities are shown to be consistent with these assumptions. C1 SUNY STONY BROOK,STONY BROOK,NY 11794. RP ZALLER, J (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 68 TC 452 Z9 462 U1 9 U2 51 PU UNIV TEXAS PRESS PI AUSTIN PA BOX 7819, AUSTIN, TX 78713-7819 SN 0092-5853 J9 AM J POLIT SCI JI Am. J. Polit. Sci. PD AUG PY 1992 VL 36 IS 3 BP 579 EP 616 DI 10.2307/2111583 PG 38 WC Political Science SC Government & Law GA JM882 UT WOS:A1992JM88200001 ER PT J AU VOLKOW, ND HITZEMANN, R WANG, GJ FOWLER, JS BURR, G PASCANI, K DEWEY, SL WOLF, AP AF VOLKOW, ND HITZEMANN, R WANG, GJ FOWLER, JS BURR, G PASCANI, K DEWEY, SL WOLF, AP TI DECREASED BRAIN METABOLISM IN NEUROLOGICALLY INTACT HEALTHY ALCOHOLICS SO AMERICAN JOURNAL OF PSYCHIATRY LA English DT Article ID CEREBRAL BLOOD-FLOW; ETHANOL; CONSUMPTION; ABSTINENCE; WITHDRAWAL AB Objective: The extent to which cerebral dysfunction in alcoholics is related to the direct effects of alcohol in the brain rather than to indirect mechanisms and/or alcohol withdrawal remains unclear. The purpose of this study was to evaluate whether healthy alcoholics with no evidence of alcohol-associated complications showed changes in brain glucose metabolism. Method: Positron emission tomography and [F-18]-fluorodeoxyglucose were used to measure regional brain metabolism. The study group consisted of 22 normal, healthy, right-handed volunteers and 22 neurologically intact, healthy, right-banded alcoholics tested 6 to 32 days after alcohol discontinuation. Results: Alcoholics showed significantly lower whole brain metabolism than normal control subjects. Normalization of regional metabolic values to the whole brain metabolic rate revealed that the left parietal and right frontal cortices were the most affected regions. Although the whole brain metabolic rate was correlated with the amount of time since alcohol discontinuation, the "normalized' decreases in left parietal and right frontal glucose metabolism were not. Conclusions: These findings support the contribution of the direct effect of alcohol as well as alcohol withdrawal on the changes in regional brain metabolism seen in alcoholics. They also provide evidence of cerebral changes in neurologically intact healthy alcoholics. C1 SUNY STONY BROOK,DEPT PSYCHIAT,STONY BROOK,NY 11794. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RP VOLKOW, ND (reprint author), BROOKHAVEN NATL LAB,DEPT MED,BLDG 490,UPTON,NY 11973, USA. FU NINDS NIH HHS [NS-15638] NR 35 TC 112 Z9 114 U1 0 U2 2 PU AMER PSYCHIATRIC ASSOCIATION PI WASHINGTON PA 1400 K ST NW, WASHINGTON, DC 20005 SN 0002-953X J9 AM J PSYCHIAT JI Am. J. Psychiat. PD AUG PY 1992 VL 149 IS 8 BP 1016 EP 1022 PG 7 WC Psychiatry SC Psychiatry GA JF708 UT WOS:A1992JF70800004 PM 1636801 ER PT J AU BANCEL, F SALMON, JM VIGO, J VO-DINH, T VIALLET, P AF BANCEL, F SALMON, JM VIGO, J VO-DINH, T VIALLET, P TI INVESTIGATION OF NONCALCIUM INTERACTIONS OF FURA-2 BY CLASSICAL AND SYNCHRONOUS FLUORESCENCE SPECTROSCOPY SO ANALYTICAL BIOCHEMISTRY LA English DT Article ID INTRACELLULAR CALCIUM; INDICATORS; CELLS; BINDING; SELECTIVITY; MAGNESIUM; INDO-1; PH C1 OAK RIDGE NATL LAB, ADV MONITORING DEV GRP, OAK RIDGE, TN 37831 USA. RP BANCEL, F (reprint author), UNIV PERPIGNAN, CNRS, URA 1289, MICROFLUORIMETRIE QUANTITAT GRP, 52 AVE VILLENEUVE, F-66860 PERPIGNAN, FRANCE. NR 23 TC 25 Z9 26 U1 0 U2 3 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0003-2697 J9 ANAL BIOCHEM JI Anal. Biochem. PD AUG 1 PY 1992 VL 204 IS 2 BP 231 EP 238 DI 10.1016/0003-2697(92)90232-V PG 8 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA JF829 UT WOS:A1992JF82900002 PM 1443519 ER PT J AU PETERSEN, SL BALLOU, NE AF PETERSEN, SL BALLOU, NE TI EFFECTS OF CAPILLARY TEMPERATURE CONTROL AND ELECTROPHORETIC HETEROGENEITY ON PARAMETERS CHARACTERIZING SEPARATIONS OF PARTICLES BY CAPILLARY ZONE ELECTROPHORESIS SO ANALYTICAL CHEMISTRY LA English DT Article ID EFFICIENCY AB The effect of system parameters and particle properties on separations by capillary zone electrophoresis have been determined for mixtures of charged polystyrene latex particles. Maintenance of constant capillary temperature by a thermostated system significantly reduced the large dependencies on voltage of mobilities, selectivity, efficiency, and resolution which were observed on a nonthermostated system. Electrophoretic heterogeneity (i.e., microheterogeneity) in the particle samples was determined to be the major source of zone broadening on the thermostated system. Since zone broadening due to electrophoretic heterogeneity is independent of voltage, the observed efficiencies were independent of voltage. Resolution was also found to be independent of voltage. The observed independence of efficiency on voltage indicated that particle-wall interactions were negligible and that the separations were electrophoretic in nature. The relative standard deviation of the mobility distribution for a 0.07-mu-m carboxylate-modified latex was determined to be 1.5%, which led to an efficiency of only 4400 theoretical plates. The large efficiency losses resulting from electrophoretic heterogeneity decrease restrictions on other broadening sources. Thus, when zone broadening Is dominated by electrophoretic heterogeneity, larger injection and detection volumes, capillary inner diameters, and operating powers can be employed without any significant further loss of efficiency or resolution. C1 PACIFIC NW LAB, DEPT CHEM SCI, RICHLAND, WA 99352 USA. NR 21 TC 65 Z9 67 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 AUG 1 PY 1992 VL 64 IS 15 BP 1676 EP 1681 DI 10.1021/ac00039a009 PG 6 WC Chemistry, Analytical SC Chemistry GA JF827 UT WOS:A1992JF82700010 ER PT J AU TAYLOR, JA YEUNG, ES AF TAYLOR, JA YEUNG, ES TI AXIAL-BEAM LASER-EXCITED FLUORESCENCE DETECTION IN CAPILLARY ELECTROPHORESIS SO ANALYTICAL CHEMISTRY LA English DT Note ID ZONE ELECTROPHORESIS; ABSORPTION DETECTION; LIQUID-CHROMATOGRAPHY C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 12 TC 42 Z9 42 U1 2 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD AUG 1 PY 1992 VL 64 IS 15 BP 1741 EP 1744 DI 10.1021/ac00039a020 PG 4 WC Chemistry, Analytical SC Chemistry GA JF827 UT WOS:A1992JF82700021 ER PT J AU ZINBO, M SCHUETZLE, D HSIEH, DPH KADO, NY DAISEY, JM GUNDEL, LA AF ZINBO, M SCHUETZLE, D HSIEH, DPH KADO, NY DAISEY, JM GUNDEL, LA TI AN IMPROVED FRACTIONATION PROCEDURE FOR THE BIOASSAY-DIRECTED CHEMICAL-ANALYSIS OF AMBIENT AIR PARTICULATE EXTRACTS SO ANALYTICAL SCIENCES LA English DT Article DE AMBIENT AIR PARTICULATES; IMPROVED FRACTIONATION; POLAR ORGANIC COMPOUNDS; BIOASSAY DIRECTED CHEMICAL ANALYSIS; MUTAGENIC ACTIVITY ID POLYCYCLIC AROMATIC-COMPOUNDS; MUTAGENS; MATTER; ASSAY AB Methodologies have been developed for the efficient extraction and fractionation of organic components present in ambient air particulate matter. A protocol of ultrasonic solvent extraction, solvent exchange, and solid-phase extraction (SPE) results in five organic fractions which account for more than 95% of the mass of the dichloromethane (DCM) extractable organic components. These fractionated samples are amenable to subsequent bioassay studies and identification of potentially toxic compounds. A National Institute of Standards and Technology (NIST) ambient "Air Particles" sample (SRM 1649) was used to help validate this procedure. The unoxidized lubricating oil, polymeric components (MwBAR/MnBAR=4700/1300) and hydrated inorganic salts were effectively separated from the polar organic compound fractions. The recovery of mutagenic activity for the fractionation procedure was 72 and 78% (with and without S9 activation enzymes) using a TA98 Salmonella typhimurium microsuspension bioassay. Further analysis shows that the chemical integrity of the extract is maintained using this fractionation procedure. C1 LAWRENCE BERKELEY LAB,INDOOR ENVIRONM PROGRAM,BERKELEY,CA 94720. UNIV CALIF DAVIS,DEPT ENVIRONM TOXICOL,DAVIS,CA 95616. RP ZINBO, M (reprint author), FORD MOTOR CO,RES LAB,POB 2053,DEARBORN,MI 48121, USA. NR 21 TC 11 Z9 11 U1 0 U2 0 PU JAPAN SOC ANALYTICAL CHEM PI TOKYO PA 26-2 NISHIGOTANDA 1 CHOME SHINAGAWA-KU, TOKYO 141, JAPAN SN 0910-6340 J9 ANAL SCI JI Anal. Sci. PD AUG PY 1992 VL 8 IS 4 BP 461 EP 468 DI 10.2116/analsci.8.461 PG 8 WC Chemistry, Analytical SC Chemistry GA JH166 UT WOS:A1992JH16600003 ER PT J AU ERLER, J JUNGNICKEL, D LAUER, J MAS, J AF ERLER, J JUNGNICKEL, D LAUER, J MAS, J TI STRING EMISSION FROM TWISTED SECTORS - COCYCLE OPERATORS AND MODULAR BACKGROUND SYMMETRIES SO ANNALS OF PHYSICS LA English DT Article ID CONFORMAL FIELD-THEORY; ASYMMETRIC ORBIFOLDS; HETEROTIC STRINGS; VERTEX OPERATORS; SUPERSTRINGS; CONSTRUCTION; LATTICES; REPRESENTATIONS; DIMENSIONS; DUALITY C1 MAX PLANCK INST PHYS & ASTROPHYS,WERNER HEISENBERG INST PHYS,W-8000 MUNICH 40,GERMANY. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. UNIV SANTIAGO,FAC FIS,DEPT FIS TEOR,E-15706 SANTIAGO,SPAIN. RP ERLER, J (reprint author), TECH UNIV MUNICH,DEPT PHYS,W-8046 GARCHING,GERMANY. NR 39 TC 9 Z9 9 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-4916 J9 ANN PHYS-NEW YORK JI Ann. Phys. PD AUG 1 PY 1992 VL 217 IS 2 BP 318 EP 363 DI 10.1016/0003-4916(92)90155-F PG 46 WC Physics, Multidisciplinary SC Physics GA JJ617 UT WOS:A1992JJ61700006 ER PT J AU WATTS, W PAL, A FORD, L MILLER, GH VO-DINH, T EASTWOOD, D LIDBERG, R AF WATTS, W PAL, A FORD, L MILLER, GH VO-DINH, T EASTWOOD, D LIDBERG, R TI IMPROVED METHODS FOR SCREENING OF POLYCHLORINATED-BIPHENYLS (PCBS) USING ROOM-TEMPERATURE PHOSPHORESCENCE SO APPLIED SPECTROSCOPY LA English DT Article DE PHOSPHORESCENCE; LUMINESCENCE; POLYCHLORINATED BIPHENYL; SOIL ANALYSIS; ENVIRONMENTAL SCREENING ID SYNCHRONOUS LUMINESCENCE; SUBSTRATE AB Several methods for the improvement of room-temperature phosphorescence (RTP) analysis of polychlorinated biphenyls (PCBs) have been investigated. Two approaches that were investigated in order to detect improvements over existing methods were the second-derivative technique and synchronous scanning techniques. The effects of several phosphorescence enhancing agents were studied in order to improve the sensitivity of the RTP method. The results indicated that the RTP technique is simple and efficient for the screening of PCBs in soil samples. C1 OAK RIDGE NATL LAB, DIV HLTH & SAFETY RES, ADV MONITORING DEV GRP, OAK RIDGE, TN 37831 USA. LOCKHEED ENGN & SCI CO, LAS VEGAS, NV 89119 USA. NR 17 TC 11 Z9 13 U1 0 U2 3 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 5320 SPECTRUM DRIVE SUITE C, FREDERICK, MD 21703 USA SN 0003-7028 EI 1943-3530 J9 APPL SPECTROSC JI Appl. Spectrosc. PD AUG PY 1992 VL 46 IS 8 BP 1235 EP 1239 DI 10.1366/0003702924123953 PG 5 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA JJ474 UT WOS:A1992JJ47400007 ER PT J AU LIPERT, RJ LEE, SC EDELSON, MC AF LIPERT, RJ LEE, SC EDELSON, MC TI APPLICATION OF DIODE-LASERS TO ACTINIDE ATOM MONITORING SO APPLIED SPECTROSCOPY LA English DT Article DE DIODE LASERS; OPTOGALVANIC SPECTROSCOPY; ATOMIC SPECTROSCOPY; ACTIMIDES ID PHYSICS; URANIUM C1 US DOE,AMES LAB,AMES,IA 50011. RI Lipert, Robert/A-8571-2009 NR 8 TC 11 Z9 11 U1 1 U2 1 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 201B BROADWAY ST, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD AUG PY 1992 VL 46 IS 8 BP 1307 EP 1308 DI 10.1366/0003702924123935 PG 2 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA JJ474 UT WOS:A1992JJ47400020 ER PT J AU LOUIE, SG AF LOUIE, SG TI THEORY OF ELECTRONIC EXCITATIONS ON SEMICONDUCTOR SURFACES SO APPLIED SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 1ST INTERNATIONAL SYMP ON ATOMICALLY CONTROLLED SURFACES AND INTERFACES ( ACSI-1 ) CY NOV 19-22, 1991 CL TOKYO, JAPAN SP JAPAN SOC APPL PHYS ID BONDED CHAIN MODEL; PHOTOTHERMAL DISPLACEMENT SPECTROSCOPY; RESOLVED INVERSE PHOTOEMISSION; MANY-BODY CALCULATION; X 1 SURFACE; STATE BAND; SI(111)2X1 SURFACE; POLARIZATION DEPENDENCE; OPTICAL-PROPERTIES; ATOMIC GEOMETRY AB A first-principles self-energy method is used to calculate the electron excitation energies at semiconductor surfaces. This approach yields quasiparticle energies which can be directly compared with experiment and, thus, provides a theoretical link between surface structural studies and spectroscopic probes. Application of the theory to the analysis of several clean and chemisorbed semiconductor surfaces is presented. As in the case of electron excitation energies in bulk semiconductors, significant self-energy corrections arising from many-electron effects to the surface-state energies are found. Using atomic positions from total energy minimization, the calculated quasiparticle surface-state energies quantitatively explain results from optical, photoemission, scanning tunneling, and other spectroscopic measurements. Excellent results for the photoelectric threshold are also obtained. It is found that electron-hole (excitonic) interactions may play an important role in the optical response of some surfaces such as the Si(111)2 x 1 and Ge(111)2 x 1 surfaces. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP LOUIE, SG (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 54 TC 1 Z9 1 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-4332 J9 APPL SURF SCI JI Appl. Surf. Sci. PD AUG PY 1992 VL 60-1 BP 13 EP 21 DI 10.1016/0169-4332(92)90390-J PG 9 WC Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Chemistry; Materials Science; Physics GA JR939 UT WOS:A1992JR93900003 ER PT J AU NEWMAN, MC APLIN, MS AF NEWMAN, MC APLIN, MS TI ENHANCING TOXICITY DATA INTERPRETATION AND PREDICTION OF ECOLOGICAL RISK WITH SURVIVAL-TIME MODELING - AN ILLUSTRATION USING SODIUM-CHLORIDE TOXICITY TO MOSQUITOFISH (GAMBUSIA-HOLBROOKI) SO AQUATIC TOXICOLOGY LA English DT Article DE TOXICITY; MODELING; STATISTIC; FRESH-WATER; FISH; SODIUM CHLORIDE ID ALLOZYME GENOTYPE; INORGANIC MERCURY; AFFINIS BAIRD; EXPOSURE; DEATH; POPULATIONS; CADMIUM; COPPER; GIRARD; FISH AB Protocols for estimating toxic endpoints (e.g. 96-h LC50) dominate research in aquatic toxicology to the near exclusion of equally appropriate techniques such as survival time modeling. By noting time-to-death during routine testing, statistical power, incorporation of covariates, prediction of toxic effect over time and linkage to life table characteristics can be improved. Consequently, prediction of ecological risk is enhanced. Survival time modeling is illustrated with acute NaCl toxicity data for the mosquitofish, Gambusia holbrooki. Extrinsic factors (salt concentration) and intrinsic factors (fish wet weight) influencing toxic impact are included in the model. A model assuming a Weibull distribution best fit these data. With such a model, median time-to-death can be estimated for any size fish at any toxicant concentration within the tested range. Survival time modeling extracts more information from toxicity data than routine endpoint methods but does not preclude estimation of standard endpoints. Survival time modeling should be considered as an adjunct to routine toxicity testing endpoints in many situations. C1 POMONA COLL,CLAREMONT,CA 91711. RP NEWMAN, MC (reprint author), UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,AIKEN,SC 29801, USA. NR 31 TC 31 Z9 31 U1 1 U2 14 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-445X J9 AQUAT TOXICOL JI Aquat. Toxicol. PD AUG PY 1992 VL 23 IS 2 BP 85 EP 96 DI 10.1016/0166-445X(92)90001-4 PG 12 WC Marine & Freshwater Biology; Toxicology SC Marine & Freshwater Biology; Toxicology GA JL664 UT WOS:A1992JL66400001 ER PT J AU BALHORN, R CORZETT, M MAZRIMAS, JA AF BALHORN, R CORZETT, M MAZRIMAS, JA TI FORMATION OF INTRAPROTAMINE DISULFIDES INVITRO SO ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS LA English DT Article ID AMINO-ACID-SEQUENCE; HUMAN-SPERM PROTAMINE-P1; NUCLEOTIDE-SEQUENCE; MOUSE PROTAMINE-1; BULL SPERMATOZOA; NUCLEAR PROTEINS; RIBONUCLEASE-A; RAINBOW-TROUT; 2 FORMS; CHROMATIN RP BALHORN, R (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV BIOMED,L-452,LIVERMORE,CA 94550, USA. NR 49 TC 30 Z9 31 U1 0 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-9861 J9 ARCH BIOCHEM BIOPHYS JI Arch. Biochem. Biophys. PD AUG 1 PY 1992 VL 296 IS 2 BP 384 EP 393 DI 10.1016/0003-9861(92)90588-N PG 10 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JD476 UT WOS:A1992JD47600004 PM 1632631 ER PT J AU WILLIAMS, ML VOGEL, JS GHADIALLY, R BROWN, BE ELIAS, PM AF WILLIAMS, ML VOGEL, JS GHADIALLY, R BROWN, BE ELIAS, PM TI EXOGENOUS ORIGIN OF NORMAL-ALKANES IN PATHOLOGICAL SCALE SO ARCHIVES OF DERMATOLOGY LA English DT Article ID CONGENITAL ICHTHYOSIFORM ERYTHRODERMA; AUTOSOMAL RECESSIVE ICHTHYOSIS; SKIN SURFACE-LIPIDS; STRATUM-CORNEUM; N-ALKANES; DIFFERENTIATION; LAMELLAE; BARRIER AB Background.- Although n-alkanes accumulate in some disorders of cornification, recent studies using radioactive carbon 14 content by accelerator mass spectrometry point to an exogenous origin for alkanes in normal stratum corneum, and their derivation in congenital ichthyosiform erythroderma remains controversial. Design and Results.- Using C-14 content to measure sample age, the n-alkane fractions from two patients with congenital ichthyosiform erythroderma contained no detectable contemporary materials. By electron microscopy, alkane-enriched emollients (petrolatum [Vaseline]) permeated to all levels of stratum corneum of hairless mice, expanding the intercellular domains and distorting membrane bilayers. Similar ultrastructural changes were also observed in the stratum corneum of patients with congenital ichthyosiform erythroderma. When alkanes were excluded, no differences in lipid content were evident between two forms of autosomal recessive ichthyosis. Conclusions.- These data demonstrate that scale n-alkanes in disorders of cornification derive from environmental sources and indicate the pervasiveness of petroleum-based emollients in skin. Therefore, epidermal lipid analyses must be interpreted with caution. However, these studies do not rule out an important therapeutic and/or pathogenic role for exogenous n-alkanes in skin. C1 LAWRENCE LIVERMORE NATL LAB,CTR ACCELERATOR MASS SPECTROMETRY,LIVERMORE,CA 94550. UNIV CALIF SAN FRANCISCO,DEPT DERMATOL,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT PEDIAT,SAN FRANCISCO,CA 94143. RP WILLIAMS, ML (reprint author), VET AFFAIRS MED CTR,DERMATOL SERV 190,4150 CLEMENT ST,SAN FRANCISCO,CA 94121, USA. FU NIAMS NIH HHS [AR 19098, AR 29908] NR 39 TC 8 Z9 8 U1 1 U2 1 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0003-987X J9 ARCH DERMATOL JI Arch. Dermatol. PD AUG PY 1992 VL 128 IS 8 BP 1065 EP 1071 DI 10.1001/archderm.128.8.1065 PG 7 WC Dermatology SC Dermatology GA JH724 UT WOS:A1992JH72400005 PM 1497360 ER PT J AU BECKER, RH HELFAND, DJ WHITE, RL AF BECKER, RH HELFAND, DJ WHITE, RL TI THE DISCOVERY OF AN X-RAY SELECTED, RADIO-LOUD QUASAR AT Z=3.9 SO ASTRONOMICAL JOURNAL LA English DT Article ID ORIGIN AB A flux-limited catalog of radio sources in the northern sky has been used to select approximately 600 weak x-ray sources from a database of approximately 10(5) 2-4-sigma fluctuations derived from Einstein Observatory imaging proportional counter x-ray images. Optical spectroscopy of only six of these sources resulted in the discovery of a quasar with an emission-line redshift of 3.87, the highest redshift x-ray source yet discovered. Subsequent VLA observations reveal the source to have a flat-spectrum radio core plus an unresolved radio lobe 2.5 " away with a spectral index of alpha = - 1.45. The lobe is connected to the core by a weak jet. The integrated flux density of the source at 20 cm is 0.66 Jy. The V magnitude of the quasar is 19.5, and the tentative x-ray source has a very soft spectrum. We discuss the properties of this object in the context of known high-redshift radio sources and existing x-ray selected quasar samples, and comment on the potential of our discovery technique for exploring the properties of very distant active galaxies. C1 LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. COLUMBIA UNIV,NEW YORK,NY 10027. UNIV COLORADO,JOINT INST LAB ASTROPHYS,BOULDER,CO 80309. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. RP BECKER, RH (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. RI White, Richard/A-8143-2012 NR 20 TC 19 Z9 19 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD AUG PY 1992 VL 104 IS 2 BP 531 EP 534 DI 10.1086/116251 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JF142 UT WOS:A1992JF14200002 ER PT J AU DEARBORN, DSP SCHRAMM, DN HOBBS, LM AF DEARBORN, DSP SCHRAMM, DN HOBBS, LM TI MASS-LOSS AND A POSSIBLE POPULATION-II LITHIUM DIP SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, ABUNDANCES; STARS, EVOLUTION; STARS, MASS LOSS; STARS, POPULATION-II ID HALO-STARS; ABUNDANCE; DWARFS AB It is shown that the recent observation of a subplateau lithium abundance for a high surface temperature (T approximately 6300 K) Population II star relative to the Population II lithium plateau can be explained by main-sequence mass loss. This explanation is identical to our previously proposed explanation for the Population I lithium dip and predicts a similar dip for Population II. It is assumed that the main-sequence mass loss in both cases is associated with the instability strip intersecting the main sequence. This mass-loss process can also decrease globular cluster ages by approximately 1 G r. C1 UNIV CHICAGO,CHICAGO,IL 60637. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV CHICAGO,YERKES OBSERV,WILLIAMS BAY,WI 53191. RP DEARBORN, DSP (reprint author), LAWRENCE LIVERMORE NATL LAB,MS L387,POB 808,LIVERMORE,CA 94550, USA. NR 21 TC 12 Z9 12 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 AUG 1 PY 1992 VL 394 IS 2 BP L61 EP L64 DI 10.1086/186472 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JE714 UT WOS:A1992JE71400007 ER PT J AU VAIRAVAMURTHY, A ROBERTS, JM NEWMAN, L AF VAIRAVAMURTHY, A ROBERTS, JM NEWMAN, L TI METHODS FOR DETERMINATION OF LOW-MOLECULAR-WEIGHT CARBONYL-COMPOUNDS IN THE ATMOSPHERE SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Review ID PERFORMANCE LIQUID-CHROMATOGRAPHY; MODIFIED PARAROSANILINE METHOD; LASER ABSORPTION-SPECTROSCOPY; ELECTRON-CAPTURE DETECTION; GLASS-FIBER FILTERS; GAS-PHASE REACTION; AMBIENT AIR; HYDROGEN-PEROXIDE; QUANTITATIVE-DETERMINATION; TROPOSPHERIC FORMALDEHYDE AB Determination of carbonyl compounds in the ambient atmosphere is receiving increasing attention because of the critical role these compounds play in tropospheric organic chemistry. Currently, field measurements are very limited mainly because of the analytical challenges posed by trace concentrations and interferences arising from atmospheric co-pollutants. We review here the methods used for determination of carbonyl compounds, from an atmospheric chemistry perspective, emphasizing the principles, advantages and limitations. Since a large number of varied types of methods have been used specifically for determination of formaldehyde, it is considered separately from other carbonyls. It is clear that despite more than a decade of work, many problems related to sampling. interferences and artifacts have not been resolved. Because of the increasing demand for time-series measurements in field studies, an automated method for continuous sampling and analysis of carbonyls is very much required. Important issues to be considered in the development of a suitable field method and potential approaches are discussed. RP VAIRAVAMURTHY, A (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. RI Roberts, James/A-1082-2009 OI Roberts, James/0000-0002-8485-8172 NR 172 TC 121 Z9 124 U1 1 U2 23 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0004-6981 J9 ATMOS ENVIRON A-GEN PD AUG PY 1992 VL 26 IS 11 BP 1965 EP 1993 DI 10.1016/0960-1686(92)90083-W PG 29 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA JB794 UT WOS:A1992JB79400001 ER PT J AU HALES, JM RENNE, DS AF HALES, JM RENNE, DS TI SOURCE RECEPTOR LINEARITY - DEFINITIONS, MEASUREMENT AND PRACTICAL IMPLICATIONS SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Article DE SOURCE; RECEPTOR; LINEARITY; MODELS; TRACER AB The concepts of linearity and nonlinearity have emerged as increasingly important focal points in analysis of pollution control and the atmospheric source-receptor sequence. Much of this analysis has been clouded, however, by the application of various interpretations and definitions of "linearity" by the variety of investigators in the field. In view of this situation it seems desirable to establish a standard definition of source-receptor linearity, which can be used as a common reference point for researchers addressing various aspects of this problem. Specifically, a definition is desired that: (1) is sufficiently concise to be of practical use for strategic planning by the policy-analysis community; (2) is sufficiently well-posed to preclude any ambiguity of interpretation; (3) provides a consistent interpretation over all scales of application, ranging from microscopic systems to the macroscopic source-receptor sequence in its totality; and (4) is consistent with (or at least reconcilable with) standard mathematical terminology. Such a definition is described in this paper. In essence, this definition is based on the well-known mathematical concept of a linear operator; but extensive elaboration of this concept is required to describe the behavior of macroscopic atmospheric systems, especially those involving multiple interactive components. Despite the desire for succinctness noted above, this definition is not particularly concise. This detail is found to be necessary, however, in order to achieve the other features on this list. The description of linearity given in this paper is recommended for use as a reference definition by future policy analysis and mechanistic studies in this general field. C1 PACIFIC NW LAB, DEPT ATMOSPHER SCI, RICHLAND, WA 99352 USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0004-6981 J9 ATMOS ENVIRON A-GEN PD AUG PY 1992 VL 26 IS 11 BP 2111 EP 2123 DI 10.1016/0960-1686(92)90095-3 PG 13 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA JB794 UT WOS:A1992JB79400013 ER PT J AU GAMMAGE, RB DUDNEY, CS WILSON, DL SAULTZ, RJ BAUER, BC AF GAMMAGE, RB DUDNEY, CS WILSON, DL SAULTZ, RJ BAUER, BC TI SUBTERRANEAN TRANSPORT OF RADON AND ELEVATED INDOOR RADON IN HILLY KARST TERRAINS SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON INDOOR AIR QUALITY AND CLIMATE - INDOOR AIR 90 : CHARACTERIZATION OF INDOOR AIR CY JUL 29-AUG 03, 1990 CL TORONTO, CANADA DE RADON; KARST; AEROSTATIC PRESSURE; SUBTERRANEAN TRANSPORT; CAVITIES; HOUSES ID RN-222 AB Subterranean networks of cavities and fissures can present circulatory systems facilitating convective and advective transport of radon-bearing air. Evidence points to aerostatic pressure differentials being the principal driving force for subterranean transport of radon in some hilly limestone terrains of the southern Appalachians; differences between the underground and outside air temperatures, and the concomitant differences in air density, appear to be the dominant factor in producing the differences in aerostatic pressure. Examples are presented of houses experiencing elevated indoor levels as a consequence of being built on top of and apparently communicating with such subterranean systems. The location of a house near the upper or lower end of a subterranean circulatory system can result in amplification of indoor radon levels in winter or summer, respectively. These phenomena have been studied in and around houses located in the hilly karst areas of Huntsville, AL, and Oak Ridge, TN. RP GAMMAGE, RB (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,MEASUREMENTS SYST RES GRP,OAK RIDGE,TN 37831, USA. NR 13 TC 13 Z9 13 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0004-6981 J9 ATMOS ENVIRON A-GEN PD AUG PY 1992 VL 26 IS 12 BP 2237 EP 2246 DI 10.1016/0960-1686(92)90413-F PG 10 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA JG150 UT WOS:A1992JG15000013 ER PT J AU HEYER, H EGAN, JJ FREYLAND, W AF HEYER, H EGAN, JJ FREYLAND, W TI ELECTRICAL-CONDUCTIVITY AND THERMODYNAMIC PROPERTIES OF LIQUID NA3+DELTA-SB ALLOYS SO BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS LA English DT Article DE ELECTRICAL PROPERTIES; LIQUIDS; SEMICONDUCTORS; THERMODYNAMICS ID SOLID SILVER SULFIDE; COULOMETRIC TITRATIONS; ELECTROLYTES; TELLURIDE; SELENIDE AB The melting point of the intermetallic compound Na3Sb was measured and found to be 1015-degrees-C. Partial molar Gibbs energies of Na in liquid Na-Sb alloys were determined at 1030-degrees-C for alloy compositions between x(Na) = 0.71 and x(Na) = 0.78 using an emf technique employing CaF2 as a solid electrolyte. A special cell design was used and is described in detail. The electrical conductivity of Na-Sb alloys was also measured at 1030-degrees-C over a composition range from x(Na) = 0.71 to x(Na) = 0.77. A scaled cell was used for these measurements where the composition of the alloy is accurately controlled by coulometric titration. Results showed that the alloys are liquid semiconductors. The thermodynamic and electrical properties are quantitatively explained by a model previously proposed by Carl Wagner, and pertinent equations are given. The correspondence with the predictions of electrical transport in disordered liquid semiconductors is discussed. C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. UNIV KARLSRUHE,INST PHYS CHEM & ELEKTROCHEM,W-7500 KARLSRUHE,GERMANY. NR 17 TC 7 Z9 7 U1 0 U2 3 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0005-9021 J9 BER BUNSEN PHYS CHEM JI Ber. Bunsen-Ges. Phys. Chem. Chem. Phys. PD AUG PY 1992 VL 96 IS 8 BP 962 EP 966 PG 5 WC Chemistry, Physical SC Chemistry GA JQ009 UT WOS:A1992JQ00900002 ER PT J AU RODUNER, E BARTELS, DM AF RODUNER, E BARTELS, DM TI SOLVENT AND ISOTOPE EFFECTS ON ADDITION OF ATOMIC-HYDROGEN TO BENZENE IN AQUEOUS-SOLUTION SO BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS LA English DT Article DE CHEMICAL KINETICS; ELEMENTARY REACTIONS; ISOTOPE EFFECTS; RADICALS; SPECTROSCOPY, ELECTRON SPIN RESONANCE ID ELECTRON; CYCLOHEXENE; WATER AB Pulsed ESR has been used to measure rate constants for the addition of hydrogen atoms to benzene as a function of temperature in aqueous solution. At 298 K we obtain k(H)(aq) = (1.1 +/- 0.1) . 10(9) M-1 s-1. The average Arrhenius activation energy, E(a) = 19.1(6) kJ . mol-1, is essentially the same in solution as in the gas phase, but the frequency factor, represented by log(A/M-1 s-1) = 12.34(9), is 54 times higher than in the gas. This may be explained in terms of solvation of reactants and transition state, with most of the enhancemant attributed to H atom solvation. In a 90% D2O/10% H2O mix, H atoms react at the same rate, but deuterium atoms react more slowly than H atoms by a factor of 1.4. The much smaller solvent enhancement previously demonstrated for the light muonium isotope is tentatively attributed to incomplete hydration of the transition state in that case. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP RODUNER, E (reprint author), UNIV ZURICH,INST PHYS CHEM,WINTERTHURER STR 190,CH-8057 ZURICH,SWITZERLAND. NR 23 TC 57 Z9 57 U1 0 U2 8 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0005-9021 J9 BER BUNSEN PHYS CHEM JI Ber. Bunsen-Ges. Phys. Chem. Chem. Phys. PD AUG PY 1992 VL 96 IS 8 BP 1037 EP 1042 PG 6 WC Chemistry, Physical SC Chemistry GA JQ009 UT WOS:A1992JQ00900012 ER PT J AU DAVIES, KTR GLASSER, ML DAVIES, RW AF DAVIES, KTR GLASSER, ML DAVIES, RW TI QUADRATURE RELATIONS FOR FINITE-LIMIT, PRINCIPAL-VALUE INTEGRALS SO CANADIAN JOURNAL OF PHYSICS LA English DT Article ID NUMERICAL EVALUATION; DISPERSION-RELATIONS; SCREENING FUNCTION; ELECTRON-GAS; DEPENDENCE; PHYSICS AB An intuitive expression is obtained for a general finite-limit, prinicipal-value (PV) integral containing a pole of arbitrary order. Such an integral is simply the difference between its "end-point quadratures," the quadrature being the result of the indefinite integral. This PV expression is fairly obvious for simple poles but requires careful justification for higher order poles. Moreover, quadratures are useful in evaluating related integrals that contain both poles and other singularities (e.g., step functions or logarithmic divergences). Then, for a certain type of finite-limit divergent integral, the PV is interpreted as its "convergent part." Also, for cases in which there are two PV's in a double integral, it is shown that the famous Poincare-Bertrand theorem applies to finite-limit as well as infinite-limit integrals. Finally, an interesting quadrature relation is derived for such double integrals, and the validity of the Poincare-Bertrand theorem is explicitly demonstrated for a simple finite-limit case. C1 CLARKSON UNIV,CORA & BAYARD CLARKSON SCI CTR,DEPT MATH COMP SCI,POTSDAM,NY 13676. GTE LABS INC,WALTHAM,MA 02254. RP DAVIES, KTR (reprint author), OAK RIDGE NATL LAB,CTR COMP INTENS PHYS,DIV PHYS,OAK RIDGE,TN 37831, USA. NR 42 TC 6 Z9 6 U1 0 U2 0 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0008-4204 J9 CAN J PHYS JI Can. J. Phys. PD AUG PY 1992 VL 70 IS 8 BP 656 EP 666 PG 11 WC Physics, Multidisciplinary SC Physics GA KA106 UT WOS:A1992KA10600012 ER PT J AU CHANTRANUPONG, L HIRSCH, G BHANUPRAKASH, K BUENKER, RJ KIMURA, M DILLON, MA AF CHANTRANUPONG, L HIRSCH, G BHANUPRAKASH, K BUENKER, RJ KIMURA, M DILLON, MA TI ABINITIO CI CALCULATION OF THE GENERALIZED OSCILLATOR STRENGTH FOR 4 TRANSITIONS OF THE CO MOLECULE SO CHEMICAL PHYSICS LA English DT Article ID ENERGY EXTRAPOLATION; CARBON MONOXIDE; SELECTION AB The generalized oscillator strength (GOS) is computed as a function of the square of the momentum transfer vector K for the A-X, B-X, C-X and E-X transitions of carbon monoxide by employing multireference CI methods. The shapes of the calculated and corresponding GOS versus K2 curves are generally found to be in good agreement with one another, but a minimum in the observed B-X data is not reproduced in the theoretical results. These findings are discussed in connection with the fact that different measurements of the absolute intensities for the B-X, C-X and E-X transitions are not in quantitative agreement with one another. C1 ARGONNE NATL LAB,DIV ENVIRONM PHYS,ARGONNE,IL 60439. RP CHANTRANUPONG, L (reprint author), BERG UNIV GESAMTHSCH WUPPERTAL,GESAMTHSCH WUPPERTAL,FACHBEREICH 9,GAUSSSTR 20,W-5600 WUPPERTAL 1,GERMANY. NR 23 TC 11 Z9 11 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD AUG 1 PY 1992 VL 164 IS 2 BP 183 EP 190 DI 10.1016/0301-0104(92)87142-V PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JF365 UT WOS:A1992JF36500003 ER PT J AU MORRIS, TR AF MORRIS, TR TI MULTICRITICAL MATTER FROM COMPLEX MATRICES SO CLASSICAL AND QUANTUM GRAVITY LA English DT Article ID QUANTUM-GRAVITY; MODELS; SURFACES; STRINGS AB A large N-matrix model of a general complex matrix generates dynamical triangulations in which the triangles can be chequered (i.e. coloured so that neighbours are opposite colours). Gravity and the multicritical matter in such triangulations are described by the KdV-type equations found in the Hermitian matrix model but without the doubling of degrees of freedom. However, by tuning further couplings it is possible to obtain a series of more general string equations with redoubled degrees of freedom. C1 UNIV SOUTHAMPTON,DEPT PHYS,SOUTHAMPTON SO9 5NH,HANTS,ENGLAND. RP MORRIS, TR (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 17 TC 4 Z9 4 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0264-9381 J9 CLASSICAL QUANT GRAV JI Class. Quantum Gravity PD AUG PY 1992 VL 9 IS 8 BP 1873 EP 1881 DI 10.1088/0264-9381/9/8/009 PG 9 WC Astronomy & Astrophysics; Physics, Multidisciplinary; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JJ379 UT WOS:A1992JJ37900009 ER PT J AU GHAN, SJ AF GHAN, SJ TI THE GCM CREDIBILITY GAP SO CLIMATIC CHANGE LA English DT Editorial Material RP GHAN, SJ (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. RI Ghan, Steven/H-4301-2011 OI Ghan, Steven/0000-0001-8355-8699 NR 0 TC 5 Z9 5 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0165-0009 J9 CLIMATIC CHANGE JI Clim. Change PD AUG PY 1992 VL 21 IS 4 BP 345 EP 346 DI 10.1007/BF00141375 PG 2 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA JF464 UT WOS:A1992JF46400001 ER PT J AU BAXTER, LL AF BAXTER, LL TI CHAR FRAGMENTATION AND FLY-ASH FORMATION DURING PULVERIZED-COAL COMBUSTION SO COMBUSTION AND FLAME LA English DT Article ID MINERAL MATTER; ELECTRON-MICROSCOPY; INSITU MEASUREMENTS AB Experimental measurements of char and fly ash size distributions are reported in the size range from approximately 0.5 to 100-mu-m for three coals, ranging in rank from high-volatile bituminous coal to lignite. These measurements are coupled with a theoretical model of fly ash formation to determine the extent of char fragmentation as a function of initial char particle size. These data reveal several mechanistic aspects of fragmentation. The extent of fragmentation is strongly dependent or size and coal rank. Bituminous coals may form over 100 fragments per char particle at large initial char particle sizes (above 80-mu-m) and less than 10 at small initial char particle sizes (less than 20-mu-m). Lignites fragment less extensively, with the number of fragments per original char particle being less than 5 at all particle sizes. These results partially resolve some apparent discrepancies in published studies of fragmentation. RP BAXTER, LL (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. RI Baxter, Larry/C-8567-2009 OI Baxter, Larry/0000-0002-0453-2659 NR 22 TC 78 Z9 82 U1 1 U2 11 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 AUG PY 1992 VL 90 IS 2 BP 174 EP 184 DI 10.1016/0010-2180(92)90118-9 PG 11 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA JE436 UT WOS:A1992JE43600008 ER PT J AU BAXTER, LL HABIB, ZG AF BAXTER, LL HABIB, ZG TI THE EFFECT OF SURFACTANTS ON DISAGGREGATION OF COAL-WATER SLURRY PARTICLES DURING COMBUSTION SO COMBUSTION AND FLAME LA English DT Article ID INSITU MEASUREMENTS; DROPLETS AB Changes in the particle size distribution of coal-water slurry droplets during water vaporization and early stages of combustion are investigated. Comparative studies for two hva bituminous coal slurries, one with and one without dispersants (surfactants), are conducted at high temperature (1900 K) in a laminar flow reactor during thc first 20 ms of residence time in an oxidizing (4 mol.% O2) environment. Results show that the initial droplet size distributions, before significant vaporization of water, are similar for both types of fuels. Slurries containing no surfactant disaggregate, producing significantly higher number densities of small particles (0.4-10-mu-m) than the slurry containing surfactant. Mass mean diameters of the slurry with no surfactant are 1.5-2.0 times smaller than those of the slurry with surfactant after slurry disaggregation. Disaggregation of slurry particles, if reproducible in large-scale systems, will have a significant positive impact on the combustion behavior of slurry-fired engines and boilers. C1 NATL INST APPL SCI,INSA ROUEN CORIA,F-76134 MT ST AIGNAN,FRANCE. RP BAXTER, LL (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. RI Baxter, Larry/C-8567-2009 OI Baxter, Larry/0000-0002-0453-2659 NR 14 TC 7 Z9 8 U1 0 U2 1 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 AUG PY 1992 VL 90 IS 2 BP 199 EP 209 DI 10.1016/0010-2180(92)90121-5 PG 11 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA JE436 UT WOS:A1992JE43600011 ER PT J AU SIMMONS, ML WASSERMAN, HJ LUBECK, OM EOYANG, C MENDEZ, R HARADA, H ISHIGURO, M AF SIMMONS, ML WASSERMAN, HJ LUBECK, OM EOYANG, C MENDEZ, R HARADA, H ISHIGURO, M TI A PERFORMANCE COMPARISON OF 4 SUPERCOMPUTERS SO COMMUNICATIONS OF THE ACM LA English DT Article DE BENCHMARKING PERFORMANCE; SUPERCOMPUTERS C1 LOS ALAMOS NATL LAB,DIV COMP & COMMUN,LOS ALAMOS,NM 87544. INST SUPERCOMP RES,CHUO KU,TOKYO 104,JAPAN. JAPAN ATOM ENERGY RES INST,CTR COMP & INFORMAT SYST,TOKYO,JAPAN. IBARAKI UNIV,MITO,IBARAKI 310,JAPAN. RP SIMMONS, ML (reprint author), LOS ALAMOS NATL LAB,COMP RES GRP,LOS ALAMOS,NM 87544, USA. NR 12 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 AUG PY 1992 VL 35 IS 8 BP 116 EP 124 DI 10.1145/135226.135234 PG 9 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA JF436 UT WOS:A1992JF43600016 ER PT J AU FEDDEMA, JT LEE, CSG MITCHELL, OR AF FEDDEMA, JT LEE, CSG MITCHELL, OR TI MODEL-BASED VISUAL FEEDBACK-CONTROL FOR A HAND-EYE COORDINATED ROBOTIC SYSTEM SO COMPUTER LA English DT Article ID WEIGHTED SELECTION; IMAGE FEATURES; VISION C1 SANDIA NATL LABS,DEPT INTELLIGENT SYST SENSORS & CONTROLS,ALBUQUERQUE,NM 87185. PURDUE UNIV,SCH ELECT ENGN,W LAFAYETTE,IN 47907. UNIV TEXAS,CHAIR ELECT ENGN,ARLINGTON,TX 76019. NR 14 TC 6 Z9 6 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0018-9162 J9 COMPUTER JI Computer PD AUG PY 1992 VL 25 IS 8 BP 21 EP 31 DI 10.1109/2.153279 PG 11 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA JH015 UT WOS:A1992JH01500003 ER PT J AU JOHNSON, JW OELKERS, EH HELGESON, HC AF JOHNSON, JW OELKERS, EH HELGESON, HC TI SUPCRT92 - A SOFTWARE PACKAGE FOR CALCULATING THE STANDARD MOLAL THERMODYNAMIC PROPERTIES OF MINERALS, GASES, AQUEOUS SPECIES, AND REACTIONS FROM 1-BAR TO 5000-BAR AND 0-DEGREES-C TO 1000-DEGREES-C SO COMPUTERS & GEOSCIENCES LA English DT Article DE SUPCRT92; EQUATIONS OF STATE; STANDARD MOLAL THERMODYNAMIC PROPERTIES; CHEMICAL EQUILIBRIUM; MINERALS; GASES; AQUEOUS SPECIES; H2O; THERMODYNAMICS; GEOCHEMISTRY ID STATIC DIELECTRIC-CONSTANT; HIGH-PRESSURES; TRANSPORT-PROPERTIES; THEORETICAL PREDICTION; ACTIVITY-COEFFICIENTS; PHASE-RELATIONS; CRITICAL REGION; TEMPERATURES; ELECTROLYTES; EQUATION AB Recent advances in theoretical geochemistry permit calculation of the standard molal thermodynamic properties of a wide variety of minerals, gases, aqueous species, and reactions from 1 to 5000 bar and 0 to 1000-degrees-C. The SUPCRT92 software package facilitates practical application of these recent theories, equations, and data to define equilibrium constraints on geochemical processes in a wide variety of geologic systems. The SUPCRT92 package is composed of three interactive FORTRAN 77 programs, SUPCRT92, MPRONS92, and CPRONS92, and a sequential-access thermodynamic database, SPRONS92.DAT. The SUPCRT92 program reads or permits user-generation of its two input files, CON and RXN, retrieves data from the direct-access equivalent of SPRONS92.DAT, calculates the standard molal Gibbs free energy, enthalpy, entropy, heat capacity, and volume of each reaction specified on the RXN file through a range of conditions specified on the CON file, and writes the calculated reaction properties to the output TAB file and, optionally, to PLT files that facilitate their graphical depiction. Calculations can be performed along the liquid side of the H2O vaporization boundary by specifying either temperature (T) or pressure (P), and in the single-phase regions of fluid H2O by specifying either T and P, T and H2O density, T and log K, or P and log K. SPRONS92.DAT, which contains standard molal thermodynamic properties at 25-degrees-C and 1 bar, equation-of-state parameters, heat capacity coefficients, and phase transition data for approximately 500 minerals, gases, and aqueous species, can be augmented or otherwise modified using MPRONS92, and converted to its direct-access equivalent using CPRONS92. C1 UNIV CALIF SAN FRANCISCO,DEPT GEOL & GEOPHYS,SAN FRANCISCO,CA 94143. RP JOHNSON, JW (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,L-219,LIVERMORE,CA 94550, USA. NR 37 TC 1507 Z9 1554 U1 8 U2 133 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0098-3004 J9 COMPUT GEOSCI JI Comput. Geosci. PD AUG PY 1992 VL 18 IS 7 BP 899 EP 947 DI 10.1016/0098-3004(92)90029-Q PG 49 WC Computer Science, Interdisciplinary Applications; Geosciences, Multidisciplinary SC Computer Science; Geology GA JR491 UT WOS:A1992JR49100006 ER PT J AU ALSTON, PG STOSS, FW AF ALSTON, PG STOSS, FW TI ENVIRONMENT ONLINE - THE GREENING OF DATABASES .3. BUSINESS AND REGULATORY INFORMATION SO DATABASE LA English DT Article C1 OAK RIDGE NATL LAB,CTR CARBON DIOXIDE & INFORMAT ANAL,OAK RIDGE,TN 37831. UNIV TENNESSEE,CTR ENERGY ENVIRONM & RESOURCES,KNOXVILLE,TN 37996. RP ALSTON, PG (reprint author), US DEPT HHS,PHS,AGCH TOX SUBSTANCES & DIS REGISTRY,ATLANTA,GA 30333, USA. NR 22 TC 0 Z9 0 U1 0 U2 0 PU ONLINE INC PI WILTON PA 462 DANBURY RD, WILTON, CT 06897-2126 SN 0162-4105 J9 DATABASE JI Database PD AUG PY 1992 VL 15 IS 4 BP 17 EP & PG 0 WC Computer Science, Information Systems; Information Science & Library Science SC Computer Science; Information Science & Library Science GA JD190 UT WOS:A1992JD19000007 ER PT J AU SHARITZ, RR BORING, LR VANLEAR, DH PINDER, JE AF SHARITZ, RR BORING, LR VANLEAR, DH PINDER, JE TI INTEGRATING ECOLOGICAL CONCEPTS WITH NATURAL-RESOURCE MANAGEMENT OF SOUTHERN FORESTS SO ECOLOGICAL APPLICATIONS LA English DT Article; Proceedings Paper CT 1991 ANNUAL MEETING OF THE AMERICAN ASSOC FOR THE ADVANCEMENT OF SCIENCE CY FEB, 1991 CL WASHINGTON, DC SP AMER ASSOC ADV SCI DE BIOLOGICAL DIVERSITY; ECOLOGICAL VALUES; FOREST MANAGEMENT; FOREST SUSTAINABILITY; FRAGMENTATION; FUNCTIONAL DIVERSITY; LANDSCAPE DIVERSITY; LANDSCAPE ECOLOGY; RIPARIAN FORESTS; SOUTHERN FORESTS ID COARSE WOODY DEBRIS; HISTORY AB Natural resource management must integrate commercial development and use of forest resources with the maintenance of ecological values. The "New Perspectives" program of the U.S. Forest Service is responding to increased public environmental awareness and legislative mandates in placing a greater emphasis on ecosystem sustainability and non-traditional utilization of national forestlands. The forest of the southern United States is a complexity of associations developed along topographic and environmental gradients and shaped by natural disturbances and anthropogenic perturbations. It is highly fragmented as a result of past clearing for agriculture and timber harvesting and patterns of land ownership. Southern forests, in contrast to those in other regions, are mostly privately owned. This fragmentation is being maintained by current urbanization and industrialization as the population of the South increases. Our purpose is to identify ecological themes and concepts compatible with the stewardship philosophy of the Forest Service's New Perspectives that can be applied to the management of sustainable southern forest resources. Of special concern are the maintenance of biological diversity, watershed and water quality protection, and the assessment of regional land-use effects on the integrity of forest ecosystems and on continued forest productivity. Ecological principles must be integrated with natural resource management on landscape and regional scales to achieve sustainability of the southern forest ecosystem. C1 UNIV GEORGIA,DEPT BOT,AIKEN,SC 29802. JOSEPH W JONES ECOL RES CTR,NEWTON,GA 31770. UNIV GEORGIA,SCH FOREST RESOURCES,ATHENS,GA 30602. CLEMSON UNIV,DEPT FOREST RESOURCES,CLEMSON,SC 29634. UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. RP SHARITZ, RR (reprint author), SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802, USA. NR 73 TC 70 Z9 74 U1 0 U2 15 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE, NW, STE 400, WASHINGTON, DC 20036 SN 1051-0761 J9 ECOL APPL JI Ecol. Appl. PD AUG PY 1992 VL 2 IS 3 BP 226 EP 237 DI 10.2307/1941857 PG 12 WC Ecology; Environmental Sciences SC Environmental Sciences & Ecology GA JE772 UT WOS:A1992JE77200003 PM 27759260 ER PT J AU MEGONIGAL, JP DAY, FP AF MEGONIGAL, JP DAY, FP TI EFFECTS OF FLOODING ON ROOT AND SHOOT PRODUCTION OF BALD CYPRESS IN LARGE EXPERIMENTAL ENCLOSURES SO ECOLOGY LA English DT Article DE ADVENTITIOUS ROOTS; AERENCHYMA; CARBON ALLOCATION; FLOODING; PRODUCTIVITY; RHIZOTRON; ROOTING DEPTH; ROOT PRODUCTION; ROOTS; ROOT; SHOOT; ROOT SYSTEM MORPHOLOGY; TAXODIUM-DISTICHUM ID FRAXINUS-PENNSYLVANICA SEEDLINGS; GROWTH-RESPONSES; NYSSA-SYLVATICA; ORGANIC-CARBON; SWAMP-FOREST; TUPELO; SOIL; ECOSYSTEM; DYNAMICS; FLORIDA AB Effects of hydroperiod on the root production of bald cypress (Taxodium distichum) saplings were determined in large (8.0 m2 x 1.5 m deep) watertight enclosures over three growing seasons. Our objectives were to determine the effect of continuous and periodic flooding regimes on biomass production, carbon allocation to roots and shoots, and root-system morphology. The effect of the flooding treatments on plant biomass was different for 1-yr-old seedlings and 3-yr-old saplings. After one growing season, root and shoot biomass was highest in the periodically flooded (PF) treatment. After three growing seasons there were no significant differences in total biomass but there were differences in root-to-shoot ratios. Improved growth in the continuously flooded (CF) treatment began in the second growing season and coincided with morphological adaptations to flooding. Such adaptations include the production of water roots, development of intercellular air spaces, and distinctly different root-system morphologies. Periodically flooded cypress allocated more carbon to roots than did continuously flooded cypress and developed deeper root systems. A relatively deep rooting zone may have provided the PF saplings access to water and dissolved nutrients within the water table (50-60 cm deep during summer). Continuously flooded plants had low root-to-shoot ratios and shallow root systems. A relatively shallow rooting zone with ample water and nutrients allowed CF cypress to allocate relatively more biomass to leaves. After 3 yr, total productivity in the two treatments was not significantly different, yet belowground production was greater in periodically flooded saplings (P = .05) and there was a tendency for higher aboveground production in continuously flooded saplings (P = .14). Without the belowground production estimates we might have concluded that CF plants were more productive than PF plants. Most plants can respond to changing resource availabilities by shifting the allocation of carbohydrates to roots or shoots. Because resource availability in freshwater forested wetland ecosystems can be highly variable, studies of production should include estimates of root production. C1 SAVANNAH RIVER ECOL LAB,AIKEN,SC 29801. OLD DOMINION UNIV,DEPT BIOL,NORFOLK,VA 23529. NR 63 TC 84 Z9 91 U1 1 U2 27 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE, NW, STE 400, WASHINGTON, DC 20036 SN 0012-9658 J9 ECOLOGY JI Ecology PD AUG PY 1992 VL 73 IS 4 BP 1182 EP 1193 DI 10.2307/1940668 PG 12 WC Ecology SC Environmental Sciences & Ecology GA JE984 UT WOS:A1992JE98400005 ER PT J AU DOKTYCZ, MJ ARLINGHAUS, HF ALLEN, RC JACOBSON, KB AF DOKTYCZ, MJ ARLINGHAUS, HF ALLEN, RC JACOBSON, KB TI ELECTROPHORESIS AND DETECTION OF TIN-LABELED DNAS ON OPEN-FACED GELS SO ELECTROPHORESIS LA English DT Article ID RESONANCE IONIZATION SPECTROSCOPY; FLUORESCENCE AB Alternative protocols are necessary for the use of polyacrylamide gel electrophoresis in genome scale sequencing and mapping studies. The use of radioisotopes and manual gel reading will have to be replaced with a flexible labeling system that can be detected at levels similar to or better than radioisotopes but allows automated, high-speed detection. Labeling with stable isotopes is such an alternative. These nondecaying isotopes have the potential to be detected in sub-attomole quantities, despite being surrounded by the gel matrix, due to the high selectivity and sensitivity of resonance-ionization spectroscopy coupled with a mass spectrometer, In this study the detection limits of sputter-initiated resonance ionization spectroscopy (SIRIS) are investigated using thin, open-faced polyacrylamide gels supported by plastic. This system allows reproducibility and flexibility in the choice of gel size and buffer system since the gel can be cast, washed free of polymerization by-products, dried, and stored until use. Various concentrations of an Sn-labeled oligomer were run on these gels and loads of 5 femtomoles/mm could be detected on a 240-mu-m thick gel. Gels as thin as 60-mu-m lower the detectable concentration loads to 1 femtomole/mm. The limiting factor is tin contamination in the gel which, if reduced, will further increase detection. Polymerase chain reaction (PCR) products can also be labeled and detected using Sn isotopes, which could prove useful in mapping studies. Also presented are techniques which will facilitate resolution of these PCR products on open-faced gels by employing discontinuous buffers systems and DNA mobility modifiers. C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. MED UNIV S CAROLINA,CHARLESTON,SC 29425. ATOM SCI,OAK RIDGE,TN. RI Doktycz, Mitchel/A-7499-2011 OI Doktycz, Mitchel/0000-0003-4856-8343 NR 17 TC 7 Z9 7 U1 0 U2 1 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0173-0835 J9 ELECTROPHORESIS JI Electrophoresis PD AUG PY 1992 VL 13 IS 8 BP 521 EP 528 DI 10.1002/elps.11501301108 PG 8 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA JP282 UT WOS:A1992JP28200010 PM 1451687 ER PT J AU DRMANAC, R DRMANAC, S LABAT, I CRKVENJAKOV, R VICENTIC, A GEMMELL, A AF DRMANAC, R DRMANAC, S LABAT, I CRKVENJAKOV, R VICENTIC, A GEMMELL, A TI SEQUENCING BY HYBRIDIZATION - TOWARDS AN AUTOMATED SEQUENCING OF ONE MILLION M13 CLONES ARRAYED ON MEMBRANES SO ELECTROPHORESIS LA English DT Article ID DNA; CONSTRUCTION; LIBRARIES; CLONING; VECTORS AB An immediately applicable variant of the sequencing by hybridization (SBH) method is under development with the capacity to determine up to 100 million base pairs per year. The proposed method comprises six steps: (i) arraying genomic or cDNA M 13 clones in 864-well plates (wells of 2 mm); (ii) preparation of DNA samples for spotting by growth of the M13 clones or by polymerase chain reaction (PCR) of the inserts using standard 96-well plates, or plates having as many as 864 correspondingly smaller wells; (iii) robotic spotting of 13 824 samples on an 8 X 12 cm nylon membrane, or correspondingly more, on up to 6 times larger filters, by offset printing with a 96 or 864 0.4 mm pin device; (iv) hybridization of dotted samples with 200-2000 P-32-labeled probes comprising 16-256 10-mers having a common 8-mer, 7-mer, or 6-mer in the middle (20 probes per day, each hybridized with 250 000 dots); (v) scoring hybridization signals of 5 million sample-probe pairs per day using storage phosphor plates; and (vi) computing clone order and partial-to-complete DNA sequences using various heuristic algorithms. Genome sequencing based on a combination of this method and gel sequencing techniques may be significantly more economical than gel methods alone. RP DRMANAC, R (reprint author), ARGONNE NATL LAB,DIV BIOL & MED RES,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 34 TC 35 Z9 35 U1 0 U2 3 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0173-0835 J9 ELECTROPHORESIS JI Electrophoresis PD AUG PY 1992 VL 13 IS 8 BP 566 EP 573 DI 10.1002/elps.11501301115 PG 8 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA JP282 UT WOS:A1992JP28200017 PM 1451694 ER PT J AU MEERSSEMAN, G PENNINGS, S BRADBURY, EM AF MEERSSEMAN, G PENNINGS, S BRADBURY, EM TI MOBILE NUCLEOSOMES - A GENERAL BEHAVIOR SO EMBO JOURNAL LA English DT Article DE ALU FAMILY; CHROMATIN; NUCLEOSOME MOBILITY; NUCLEOSOME POSITIONING; 5S RDNA ID HISTONE ACETYLATION; CHROMATIN STRUCTURE; ACTIVE CHROMATIN; PHO5 PROMOTER; DNA; SEQUENCE; TRANSCRIPTION; PROTEINS; INVIVO AB We have previously reported the mobility of positioned nucleosomes on sea urchin 5S rDNA. In this study we demonstrate the temperature dependence and the range of this mobility on 5S rDNA constructs. We find that this dynamic behavior also applies to bulk mononucleosomes and nucleosomes reconstituted onto sequences of the Alu family of ubiquitous repeats. We conclude that short range sliding is potentially a general phenomenon that is dependent on the underlying sequence and its position on the histone octamer. The nucleoprotein gel analysis used also reveals the dramatic effect on gel electrophoretic migration caused by the location of the histone octamer on DNA fragments. The usefulness of this technique for studying nucleosome positioning and its dynamics is demonstrated. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. RP MEERSSEMAN, G (reprint author), UNIV CALIF DAVIS,SCH MED,DEPT BIOL CHEM,DAVIS,CA 95616, USA. FU NIGMS NIH HHS [GM 26901] NR 34 TC 234 Z9 236 U1 0 U2 3 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0261-4189 J9 EMBO J JI Embo J. PD AUG PY 1992 VL 11 IS 8 BP 2951 EP 2959 PG 9 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA JE537 UT WOS:A1992JE53700022 PM 1639066 ER PT J AU BECKER, CD GRAY, RH AF BECKER, CD GRAY, RH TI PAST AND PRESENT WATER-QUALITY CONDITIONS IN THE HANFORD REACH, COLUMBIA RIVER SO ENVIRONMENTAL MONITORING AND ASSESSMENT LA English DT Article AB Twelve water quality variables from upstream and downstream locations in the Hanford Reach of the mainstem Columbia River, southcentral Washington, were compared statistically for the two time periods 1951 to 1953 and 1986 to 1988. During the 1951 to 1953 period, beta radioactivity and, most likely, water temperatures in the Hanford Reach were significantly higher downstream than upstream, while dissolved oxygen and sulfate were significantly lower. The increased beta radioactivity and temperature downstream were due to the discharge of cooling water from five single-purpose production reactors then operating on the Hanford Site. The last production reactor closed in January 1971. During the 1986 to 1988 period, beta radioactivity and water temperatures were similar upstream and downstream, but nitrate nitrogen had become significantly higher downstream. Comparison of 1951 to 1953 with 1986 to 1988 showed, as expected, that beta radioactivity was much lower today, at essentially background levels. Phosphate in the Hanford Reach had decreased significantly over the 35 year interval, while biochemical oxygen demand, dissolved oxygen, and nitrate nitrogen had increased. These changes, while detectable statistically, were relatively small. Today, the quality of water in the Hanford Reach remains well within Washington State standards for Class A waters. Occasional low pH values, which appear to originate upriver, violate these standards. RP BECKER, CD (reprint author), PACIFIC NW LAB, CTR EARTH & ENVIRONM SCI, RICHLAND, WA 99352 USA. NR 0 TC 3 Z9 3 U1 1 U2 4 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 AUG PY 1992 VL 22 IS 2 BP 137 EP 152 DI 10.1007/BF00418012 PG 16 WC Environmental Sciences SC Environmental Sciences & Ecology GA JK745 UT WOS:A1992JK74500005 PM 24226904 ER PT J AU WU, JM HUANG, HS LIVENGOOD, CD AF WU, JM HUANG, HS LIVENGOOD, CD TI ULTRASONIC DESTRUCTION OF CHLORINATED COMPOUNDS IN AQUEOUS-SOLUTION SO ENVIRONMENTAL PROGRESS LA English DT Article; Proceedings Paper CT 1991 ANNUAL MEETING OF THE AMERICAN INST OF CHEMICAL ENGINEERS CY 1991 CL LOS ANGELES, CA SP AMER INST CHEM ENGINEERS AB The application of ultrasonic-wave energy for the destruction of low concentrations of carbon tetrachloride into nonhazardous end products is described, and the results of experimental work are presented. Process parameters studied included steady-state temperature, concentration, pH, irradiation time, and the intensity of the applied ultrasonic-wave energy. Greater than 99% destruction efficiencies were achieved through this process, and the irradiation time required for a given degree of destruction decreased with increasing intensity of the ultrasonic energy. In addition, a detailed chemical reaction mechanism for the destruction of carbon tetrachloride in water was formulated. The agreement between the model and experimental results is generally good. RP WU, JM (reprint author), ARGONNE NATL LAB,DIV ENERGY SYST,ARGONNE,IL 60439, USA. NR 0 TC 67 Z9 98 U1 1 U2 5 PU AMER INST CHEMICAL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0278-4491 J9 ENVIRON PROG JI Environ. Prog. PD AUG PY 1992 VL 11 IS 3 BP 195 EP 201 DI 10.1002/ep.670110313 PG 7 WC Engineering, Environmental; Engineering, Chemical; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA JP146 UT WOS:A1992JP14600008 ER PT J AU PETERS, RW SHEM, L AF PETERS, RW SHEM, L TI ADSORPTION DESORPTION CHARACTERISTICS OF LEAD ON VARIOUS TYPES OF SOIL SO ENVIRONMENTAL PROGRESS LA English DT Article; Proceedings Paper CT 1991 ANNUAL MEETING OF THE AMERICAN INST OF CHEMICAL ENGINEERS CY 1991 CL LOS ANGELES, CA SP AMER INST CHEM ENGINEERS AB Laboratory studies were conducted to address the phenomena of adsorption/desorption of lead onto various types of soils, both in the absence and presence of the chelating agent, ethylenediaminetetraacetic acid (EDTA). The linear and Freundlich isotherm models provided adequate description of the adsorption/desorption behavior. Over the range of EDTA concentrations employed in the study (0.1 to 0.10M), no significant difference in the isotherm parameters was observed as a result of the applied EDTA concentration. The presence of EDTA significantly altered the adsorption/desorption behavior of lead on the soil, resulting in less of the metal being adsorbed. The soil with the higher silt/clay content had a greater amount of lead adsorbed onto it (as compared with the sandy soil). RP PETERS, RW (reprint author), ARGONNE NATL LAB,DIV ENERGY SYST,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 0 TC 45 Z9 51 U1 0 U2 5 PU AMER INST CHEMICAL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0278-4491 J9 ENVIRON PROG JI Environ. Prog. PD AUG PY 1992 VL 11 IS 3 BP 234 EP 240 DI 10.1002/ep.670110320 PG 7 WC Engineering, Environmental; Engineering, Chemical; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA JP146 UT WOS:A1992JP14600015 ER PT J AU SUTER, GW LOAR, JM AF SUTER, GW LOAR, JM TI HAZARDOUS-WASTE SITES - REPLY SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Letter RP SUTER, GW (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD AUG PY 1992 VL 26 IS 8 BP 1471 EP 1471 DI 10.1021/es00032a606 PG 1 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA JF520 UT WOS:A1992JF52000003 ER PT J AU WOODWARD, J AFFHOLTER, KA NOLES, KK TROY, NT GASLIGHTWALA, SF AF WOODWARD, J AFFHOLTER, KA NOLES, KK TROY, NT GASLIGHTWALA, SF TI DOES CELLOBIOHYDROLASEII CORE PROTEIN FROM TRICHODERMA-REESEI DISPERSE CELLULOSE MACROFIBRILS SO ENZYME AND MICROBIAL TECHNOLOGY LA English DT Article DE CELLOBIOHYDROLASE-II; CORE PROTEIN; CELLULOSE BINDING; DISPERSION; HYDROLYSIS; TRICHODERMA-REESEI ID 2 CELLOBIOHYDROLASES; LIMITED PROTEOLYSIS; SYNERGISM; HYDROLYSIS; DOMAIN; ADSORPTION; CELLULASES AB Papain digestion of a Trichoderma ressei cellulase resulted in the generation of a protein, tentatively identified as cellobiohydrolase II core protein (CBH IIcp), that could be separated from the rest of the enzyme by gel filtration. It apparently possessed the ability to disperse cellulose macrofibrils based on our findings that: (1) the amount of CBH IIcp that bound to microcrystalline cellulose (Avicel) was inversely proportional to the Avicel concentration; (2) pretreatment of Avicel with CBH IIcp increased the rate of its hydrolysis by crude cellulase: and (3) dispersion of crystalline cotton linters by CBH IIcp was visually and microscopically apparent. RP WOODWARD, J (reprint author), OAK RIDGE NATL LAB, DIV CHEM TECHNOL, OAK RIDGE, TN 37831 USA. NR 23 TC 23 Z9 23 U1 0 U2 4 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0141-0229 J9 ENZYME MICROB TECH JI Enzyme Microb. Technol. PD AUG PY 1992 VL 14 IS 8 BP 625 EP 630 DI 10.1016/0141-0229(92)90037-O PG 6 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA JE449 UT WOS:A1992JE44900005 ER PT J AU KROPP, J KNAPP, FF WEYENBERG, A VONBERGMANN, K BIERSACK, HJ AF KROPP, J KNAPP, FF WEYENBERG, A VONBERGMANN, K BIERSACK, HJ TI PANCREATIC LIPASE ACTIVITY TESTED BY URINE ANALYSIS AFTER ORAL-ADMINISTRATION OF AN I-131 TRIGLYCERIDE SO EUROPEAN JOURNAL OF NUCLEAR MEDICINE LA English DT Meeting Abstract C1 UNIV BONN,DEPT NUCL MED,W-5300 BONN,GERMANY. UNIV BONN,DEPT INTERNAL MED,W-5300 BONN,GERMANY. OAK RIDGE NATL LAB,NUCL MED GRP,OAK RIDGE,TN 37830. NR 0 TC 1 Z9 1 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 AUG PY 1992 VL 19 IS 8 BP 605 EP 605 PG 1 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA JL496 UT WOS:A1992JL49600140 ER PT J AU STEVENS, RG AF STEVENS, RG TI ELECTRIC-POWER AND BREAST-CANCER - REPLY SO FASEB JOURNAL LA English DT Letter ID ELECTROMAGNETIC-FIELDS; OCCUPATIONAL EXPOSURE RP STEVENS, RG (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 13 TC 1 Z9 1 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD AUG PY 1992 VL 6 IS 11 BP 3016 EP 3017 PG 2 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA JJ665 UT WOS:A1992JJ66500019 ER PT J AU POST, RF SANTARIUS, JF AF POST, RF SANTARIUS, JF TI OPEN CONFINEMENT SYSTEMS AND THE D-HE-3 REACTION SO FUSION TECHNOLOGY LA English DT Article DE OPEN-ENDED SYSTEMS; TANDEM MIRRORS; SPACE PROPULSION ID TANDEM MIRROR; STABILIZATION; MODES AB The special synergisms between open-ended magnetic confinement systems and the D-He-3 fuel cycle are discussed, both in general terms and through examples. Properties of open systems that make them especially suited for this fuel cycle include their ability to stably confine high-beta plasmas, their compatibility with electrostatic direct converters, and their linear geometry, which can greatly simplify the practical attainment of high magnetic fields. The example systems given include a "linear collider" and thermal barrier tandem mirror systems for both terrestrial and space travel applications. It is concluded that satisfying the demanding physics requirements posed by the D-He-3 fuel cycle may be more readily possible through the use of open-ended magnetic systems than it will be through the use of closed systems of the tokamak genre. C1 UNIV WISCONSIN,INST FUS TECHNOL,MADISON,WI 53706. RP POST, RF (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 35 TC 9 Z9 9 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD AUG PY 1992 VL 22 IS 1 BP 13 EP 26 PG 14 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JF399 UT WOS:A1992JF39900002 ER PT J AU HASEGAWA, A CHEN, L MAUEL, ME WARREN, HH MURAKAMI, S AF HASEGAWA, A CHEN, L MAUEL, ME WARREN, HH MURAKAMI, S TI A DESCRIPTION OF A D-HE-3 FUSION-REACTOR BASED ON A DIPOLE MAGNETIC-FIELD SO FUSION TECHNOLOGY LA English DT Article DE D-HE-3 FUSION; DIPOLE; MAGNETIC FIELDS; PLASMA TRANSPORT ID PARTICLE AB An ideal magnetic container for a D-He-3 fusion reactor must ensure both the stability of the confined plasma and the ability to control the confinement fusion products. A dipole magnetic field may be suitable for D-He-3 fusion since it is predicted to be able to confine high-beta plasmas while allowing extraction the high-energy charged fusion products for direct conversion as well as removal of fusion ash using resonant and/or nonresonant static magnetic perturbations. In a dipole magnetic field, even an equilibrium plasma having a phase-space density satisfying partial derivative f0(mu,J,psi)/partial derivative = 0 where psi is the flux function, has a steep enough pressure profile for high fusion reactivity within the core yet is stable to low-frequency instabilities for local beta exceeding unity. At the outer wall, the plasma density and temperature can be very low, and stability can be obtained by line-tying or localized magnetic cusps, which can be used for direct conversion. New calculations of fusion product control and plasma stability with isotropic pitch-angle distributions are described. In addition, the parameters of a new, higher field dipole reactor design are discussed. C1 PRINCETON UNIV, PRINCETON PLASMA PHYS LAB, PRINCETON, NJ 08543 USA. COLUMBIA UNIV, DEPT APPL PHYS, NEW YORK, NY 10027 USA. NATL INST FUS SCI, CTR THEORY & COMP SIMULAT, NAGOYA 46401, JAPAN. RP HASEGAWA, A (reprint author), AT&T BELL LABS, MURRAY HILL, NJ 07974 USA. RI chen, liu/I-2297-2013; Murakami, Sadayoshi/A-2191-2016 OI Murakami, Sadayoshi/0000-0002-2526-7137 NR 22 TC 8 Z9 8 U1 0 U2 0 PU AMER NUCLEAR SOC PI LA GRANGE PK PA 555 N KENSINGTON AVE, LA GRANGE PK, IL 60526 USA SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD AUG PY 1992 VL 22 IS 1 BP 27 EP 34 PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JF399 UT WOS:A1992JF39900003 ER PT J AU TELLER, E GLASS, AJ FOWLER, TK HASEGAWA, A SANTARIUS, JF AF TELLER, E GLASS, AJ FOWLER, TK HASEGAWA, A SANTARIUS, JF TI SPACE PROPULSION BY FUSION IN A MAGNETIC DIPOLE SO FUSION TECHNOLOGY LA English DT Article DE SPACE PROPULSION; MAGNETIC DIPOLE; SPECIFIC POWER ID REACTOR; FIELD AB The unique advantages of fusion rocket propulsion systems for distant missions are explored using the magnetic dipole configuration as an example. The dipole is found to have features well suited to space applications. Parameters are presented for a system producing a specific power of 1 kW/kg, capable of interplanetary flights to Mars in 90 days and to Jupiter in 1 yr and of extra-solar-system flights to 1 000 astronomical units (the Tau mission) in 20 yr. This is about ten times better specific power performance than nuclear electric fission systems. Possibilities to further increase the specific power toward 10 kW/kg are discussed, as is an approach to implementing the concept through proof testing on the moon. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. UNIV WISCONSIN,INST FUS TECHNOL,MADISON,WI 53706. RP TELLER, E (reprint author), LAWRENCE LIVERMORE NATL LAB,LAWRENCE LIVERMORE NATL LAB,POB 808,L-640,LIVERMORE,CA 94551, USA. NR 22 TC 24 Z9 24 U1 0 U2 4 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD AUG PY 1992 VL 22 IS 1 BP 82 EP 97 PG 16 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JF399 UT WOS:A1992JF39900010 ER PT J AU ATTAYA, HM SAWAN, ME KULCINSKI, GL AF ATTAYA, HM SAWAN, ME KULCINSKI, GL TI WASTE-DISPOSAL OF CANDIDATE STRUCTURAL-MATERIALS IN FUSION-REACTORS UTILIZING DIFFERENT FUEL-CYCLES SO FUSION TECHNOLOGY LA English DT Article DE STRUCTURAL MATERIALS; WASTE DISPOSAL; FUSION FUEL CYCLES AB The management and disposal of the radioactive waste generated in any nuclear system are major safety and environmental concerns for the deployment of such a power source. The waste disposal rating is compared for four structural materials when used in deuterium-tritium, deuterium-deuterium, and D-He-3 fusion reactors. The materials considered are HT-9, primary candidate alloy (PCA), Tenelon and a modified HT 9 Generic models for the reactors are assumed such that each produces a fusion power of 10 MW/m of the axial length and has a sufficient shield/blanket to produce identical magnet damage rates. The latter is achieved by varying the material compositions and thicknesses. The results show that using the advanced fuel cycle D-He-3, with its low neutron yield, alleviates the activation problems and also allows considerable volume reduction of the radioactive waste. This cycle also permits the use of conventional alloys and at the same time satisfies the regulations criteria for shallow land burial of the low-level waste. In addition, and because of the low damage rate in the D-He-3 reactors, the useful lifetimes of the materials are greatly increased. C1 UNIV WISCONSIN,INST FUS TECHNOL,MADISON,WI 53706. RP ATTAYA, HM (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 12 TC 3 Z9 3 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD AUG PY 1992 VL 22 IS 1 BP 115 EP 123 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JF399 UT WOS:A1992JF39900014 ER PT J AU SZE, DK AF SZE, DK TI POSSIBLE DESIGN MODIFICATIONS OF THE ITER FUEL-CYCLE - REPLY SO FUSION TECHNOLOGY LA English DT Letter RP SZE, DK (reprint author), ARGONNE NATL LAB,FUS POWER PROGRAM,9700 S CASS AVE,BLDG 205,ARGONNE,IL 60439, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD AUG PY 1992 VL 22 IS 1 BP 194 EP 194 PG 1 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JF399 UT WOS:A1992JF39900025 ER PT J AU STALLINGS, RL DOGGETT, NA CALLEN, D APOSTOLOU, S CHEN, LZ NANCARROW, JK WHITMORE, SA HARRIS, P MICHISON, H BREUNING, M SARIS, JJ FICKETT, J CINKOSKY, M TORNEY, DC HILDEBRAND, CE MOYZIS, RK AF STALLINGS, RL DOGGETT, NA CALLEN, D APOSTOLOU, S CHEN, LZ NANCARROW, JK WHITMORE, SA HARRIS, P MICHISON, H BREUNING, M SARIS, JJ FICKETT, J CINKOSKY, M TORNEY, DC HILDEBRAND, CE MOYZIS, RK TI EVALUATION OF A COSMID CONTIG PHYSICAL MAP OF HUMAN CHROMOSOME-16 SO GENOMICS LA English DT Article ID POLYCYSTIC KIDNEY-DISEASE; FRAGMENT LENGTH POLYMORPHISMS; HUMAN METALLOTHIONEIN GENES; ANONYMOUS DNA PROBES; LOCUS; SEQUENCE; IDENTIFICATION; MARKERS; HYBRIDIZATION; ASSIGNMENT C1 LOS ALAMOS NATL LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. ADELAIDE CHILDRENS HOSP INC,DEPT CYTOGENET & MOLEC GENET,ADELAIDE,SA 5006,AUSTRALIA. UNIV OXFORD,JOHN RADCLIFFE HOSP,INST MOLEC MED,OXFORD OX3 9DU,ENGLAND. UNIV LONDON UNIV COLL,RAYNE INST,DEPT PAEDIAT,LONDON WC1E 6BT,ENGLAND. LEIDEN UNIV,DEPT HUMAN GENET,2300 RA LEIDEN,NETHERLANDS. RP STALLINGS, RL (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545, USA. RI Mitchison, Hannah/C-1891-2008; Breuning, Martijn/E-3429-2010; Stallings, Raymond/A-7213-2008; Callen, David/G-1975-2012; OI Callen, David/0000-0002-6189-9991 NR 51 TC 54 Z9 54 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 0888-7543 J9 GENOMICS JI Genomics PD AUG PY 1992 VL 13 IS 4 BP 1031 EP 1039 DI 10.1016/0888-7543(92)90016-L PG 9 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA JH148 UT WOS:A1992JH14800016 PM 1505942 ER PT J AU FICKETT, JW TORNEY, DC WOLF, DR AF FICKETT, JW TORNEY, DC WOLF, DR TI BASE COMPOSITIONAL STRUCTURE OF GENOMES SO GENOMICS LA English DT Article ID DNA-SEQUENCES; ORGANIZATION; MODELS C1 LOS ALAMOS NATL LAB,COMPLEX SYST GRP,LOS ALAMOS,NM 87545. RP FICKETT, JW (reprint author), LOS ALAMOS NATL LAB,THEORET BIOL & BIOPHYS GRP,LOS ALAMOS,NM 87545, USA. FU NIGMS NIH HHS [GM-37812] NR 23 TC 96 Z9 99 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 0888-7543 J9 GENOMICS JI Genomics PD AUG PY 1992 VL 13 IS 4 BP 1056 EP 1064 DI 10.1016/0888-7543(92)90019-O PG 9 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA JH148 UT WOS:A1992JH14800019 PM 1505943 ER PT J AU CHEN, DJ PARK, MS CAMPBELL, E OSHIMURA, M LIU, P YING, Z WHITE, BF SICILIANO, MJ AF CHEN, DJ PARK, MS CAMPBELL, E OSHIMURA, M LIU, P YING, Z WHITE, BF SICILIANO, MJ TI ASSIGNMENT OF A HUMAN DNA DOUBLE-STRAND BREAK REPAIR GENE (XRCC5) TO CHROMOSOME-2 SO GENOMICS LA English DT Article ID RAY-SENSITIVE MUTANTS; HAMSTER OVARY CELL; IONIZING-RADIATION; CROSS-SENSITIVITY; LINES; COMPLEMENTATION; HYBRIDIZATION; RESISTANCE; CLONES C1 TOTTORI UNIV,SCH LIFE SCI,TOTTORI 638,JAPAN. UNIV TEXAS,MD ANDERSON CANC CTR,DEPT MOLEC GENET,HOUSTON,TX 77030. RP CHEN, DJ (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,MS-M888,LOS ALAMOS,NM 87545, USA. RI Liu, Paul/A-7976-2012; Lujan Center, LANL/G-4896-2012 OI Liu, Paul/0000-0002-6779-025X; FU NCI NIH HHS [CA50519]; NIGMS NIH HHS [GM34936] NR 32 TC 21 Z9 21 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 0888-7543 J9 GENOMICS JI Genomics PD AUG PY 1992 VL 13 IS 4 BP 1088 EP 1094 DI 10.1016/0888-7543(92)90023-L PG 7 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA JH148 UT WOS:A1992JH14800023 PM 1505945 ER PT J AU CALLEN, DF DOGGETT, NA STALLINGS, RL CHEN, LZ WHITMORE, SA LANE, SA NANCARROW, JK APOSTOLOU, S THOMPSON, AD LAPSYS, NM EYRE, HJ BAKER, EG SHEN, Y HOLMAN, K PHILLIPS, H RICHARDS, RI SUTHERLAND, GR AF CALLEN, DF DOGGETT, NA STALLINGS, RL CHEN, LZ WHITMORE, SA LANE, SA NANCARROW, JK APOSTOLOU, S THOMPSON, AD LAPSYS, NM EYRE, HJ BAKER, EG SHEN, Y HOLMAN, K PHILLIPS, H RICHARDS, RI SUTHERLAND, GR TI HIGH-RESOLUTION CYTOGENETIC-BASED PHYSICAL MAP OF HUMAN CHROMOSOME-16 SO GENOMICS LA English DT Article ID SOMATIC-CELL HYBRIDS; MAPPING PANEL; MESSENGER-RNA; HUMAN GENOME; DNA PROBES; GENE; SEQUENCE; POLYMORPHISM; DELETION; CLONING C1 LOS ALAMOS NATL LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. RP CALLEN, DF (reprint author), ADELAIDE CHILDRENS HOSP INC,DEPT CYTOGENET & MOLEC GENET,KING WILLIAM RD,ADELAIDE,SA 5006,AUSTRALIA. RI Callen, David/G-1975-2012; Stallings, Raymond/A-7213-2008; Sutherland, Grant/D-2606-2012 OI Callen, David/0000-0002-6189-9991; NR 50 TC 80 Z9 80 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 0888-7543 J9 GENOMICS JI Genomics PD AUG PY 1992 VL 13 IS 4 BP 1178 EP 1185 DI 10.1016/0888-7543(92)90035-Q PG 8 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA JH148 UT WOS:A1992JH14800035 PM 1505951 ER PT J AU SAMSON, F DEJONG, PJ TRASK, BJ KOZATAYLOR, P SPEER, MC POTTER, T ROSES, AD GILBERT, JR AF SAMSON, F DEJONG, PJ TRASK, BJ KOZATAYLOR, P SPEER, MC POTTER, T ROSES, AD GILBERT, JR TI ASSIGNMENT OF THE HUMAN SLOW SKELETAL TROPONIN-T GENE TO 19Q13.4 USING SOMATIC-CELL HYBRIDS AND FLUORESCENCE INSITU HYBRIDIZATION ANALYSIS SO GENOMICS LA English DT Note ID CHROMOSOME-19; SEQUENCES C1 DUKE UNIV,MED CTR,DEPT NEUROBIOL,DIV NEUROL,DURHAM,NC 27710. LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,CTR HUMAN GENOME,LIVERMORE,CA 94550. RP SAMSON, F (reprint author), DUKE UNIV,MED CTR,DEPT MED,DIV NEUROL,DURHAM,NC 27710, USA. FU NCRR NIH HHS [MOI-RR-30]; NIA NIH HHS [AGO7922]; NINDS NIH HHS [NS19999] NR 6 TC 18 Z9 18 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 0888-7543 J9 GENOMICS JI Genomics PD AUG PY 1992 VL 13 IS 4 BP 1374 EP 1375 DI 10.1016/0888-7543(92)90077-6 PG 2 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA JH148 UT WOS:A1992JH14800077 PM 1505979 ER PT J AU CANTOR, CR MIRZABEKOV, A SOUTHERN, E AF CANTOR, CR MIRZABEKOV, A SOUTHERN, E TI REPORT ON THE SEQUENCING BY HYBRIDIZATION WORKSHOP SO GENOMICS LA English DT Editorial Material RP CANTOR, CR (reprint author), LAWRENCE BERKELEY LAB,CTR HUMAN GENOME,BERKELEY,CA 94720, USA. NR 0 TC 18 Z9 18 U1 2 U2 3 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 AUG PY 1992 VL 13 IS 4 BP 1378 EP 1383 DI 10.1016/0888-7543(92)90079-8 PG 6 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA JH148 UT WOS:A1992JH14800079 PM 1505980 ER PT J AU ALVAREZ, W SMIT, J LOWRIE, W ASARO, F MARGOLIS, SV CLAEYS, P KASTNER, M HILDEBRAND, AR AF ALVAREZ, W SMIT, J LOWRIE, W ASARO, F MARGOLIS, SV CLAEYS, P KASTNER, M HILDEBRAND, AR TI PROXIMAL IMPACT DEPOSITS AT THE CRETACEOUS-TERTIARY BOUNDARY IN THE GULF-OF-MEXICO - A RESTUDY OF DSDP LEG 77 SITES 536 AND 540 SO GEOLOGY LA English DT Article ID MICROTEKTITES; TEKTITES; CRATER; HAITI AB Restudy of Deep Sea Drilling Project Sites 536 and 540 in the southeast Gulf of Mexico gives evidence for a giant wave at Cretaceous-Tertiary boundary time. Five units are recognized: (1) Cenomanian limestone underlies a hiatus in which the five highest Cretaceous stages are missing, possibly because of catastrophic K-T erosion. (2) Pebbly mudstone, 45 m thick, represents a submarine landslide possibly of K-T age. (3) Current-bedded sandstone, more than 2.5 m thick, contains anomalous iridium, tektite glass, and shocked quartz; it is interpreted as ejecta from a nearby impact crater, reworked on the deep-sea floor by the resulting (4) A 50-cm interval of calcareous mudstone containing small Cretaceous planktic foraminifera and the Ir peak is interpreted as the silt-size fraction of the Cretaceous material suspended by the impact-generated wave. (5) Calcareous mudstone with basal Tertiary forams and the uppermost tail of the Ir anomaly overlies the disturbed interval, dating the impact and wave event as K-T boundary age. Like Beloc in Haiti and Mimbral in Mexico, Sites 536 and 540 are consistent with a large K-T age impact at the nearby Chicxulub crater. C1 FREE UNIV AMSTERDAM,DEPT SEDIMENTARY GEOL,1007 MC AMSTERDAM,NETHERLANDS. SWISS FED INST TECHNOL,INST GEOPHYS,CH-8093 ZURICH,SWITZERLAND. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF DAVIS,DEPT GEOL,DAVIS,CA 95616. UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,SAN DIEGO,CA 92093. GEOL SURVEY CANADA,DIV GEOPHYS,OTTAWA K1A 0Y3,ONTARIO,CANADA. RP ALVAREZ, W (reprint author), UNIV CALIF BERKELEY,DEPT GEOL & GEOPHYS,BERKELEY,CA 94720, USA. RI Claeys, Philippe/B-4895-2008 OI Claeys, Philippe/0000-0002-4585-7687 NR 27 TC 94 Z9 94 U1 1 U2 9 PU GEOLOGICAL SOC AMERICA PI BOULDER PA PO BOX 9140 3300 PENROSE PLACE, BOULDER, CO 80301 SN 0091-7613 J9 GEOLOGY JI Geology PD AUG PY 1992 VL 20 IS 8 BP 697 EP 700 DI 10.1130/0091-7613(1992)020<0697:PIDATC>2.3.CO;2 PG 4 WC Geology SC Geology GA JG428 UT WOS:A1992JG42800006 PM 11538163 ER PT J AU SIMS, CS SWAJA, RE AF SIMS, CS SWAJA, RE TI SUMMARY STATEMENTS FROM THE 3RD CONFERENCE ON RADIATION PROTECTION AND DOSIMETRY SO HEALTH PHYSICS LA English DT Note DE DOSIMETRY; RADIATION EFFECTS; SAFETY STANDARDS; EDUCATION AB The Third Conference on Radiation Protection and Dosimetry was conducted in Orlando, FL, on 21-24 October 1991. At the end of the conference, each member of the Technical Program Committee summarized the events considered to be of particular importance. Subjects discussed included dosimetry accreditation programs, regulations, standards, compliance, advances in dosimeters and instrumentation, training, needs in metrology, and funding of dosimetry research. These statements have been collected and combined and are presented as a brief summary of the conference. RP SIMS, CS (reprint author), OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD AUG PY 1992 VL 63 IS 2 BP 192 EP 194 DI 10.1097/00004032-199208000-00006 PG 3 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA JE630 UT WOS:A1992JE63000007 PM 1356951 ER PT J AU JANSSEN, I STEBBINGS, JH AF JANSSEN, I STEBBINGS, JH TI GAMMA-DISTRIBUTION AND HOUSE RN-222 MEASUREMENTS SO HEALTH PHYSICS LA English DT Note DE 222RN; RADIOACTIVITY, NATURAL; STATISTICS; LOGNORMAL DISTRIBUTION ID PENNSYLVANIA; EXPOSURE; RN AB The statistical distribution of Rn-222 measurements from basements and first floors of homes in northeastern Pennsylvania was investigated. The gamma distribution was statistically significantly superior to the normal distribution (p < 0.005) in describing the frequency distribution of the logarithm of observed Rn-222 levels. The fit to the data was closer both in the central portion and in the upper tail. The gamma distribution has certain characteristics that make it generally useful in the study of environmental toxic agents where several different exposures over a lifetime occur and must be combined, as for risk assessment or for statistical power calculations for epidemiologic studies. C1 ARGONNE NATL LAB, DIV ENVIRONM RES, ARGONNE, IL 60439 USA. NR 11 TC 6 Z9 6 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 AUG PY 1992 VL 63 IS 2 BP 205 EP 208 DI 10.1097/00004032-199208000-00009 PG 4 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA JE630 UT WOS:A1992JE63000010 PM 1399620 ER PT J AU ROBERSON, PL CARLSON, RD AF ROBERSON, PL CARLSON, RD TI COMMENT ON DETERMINING THE LOWER LIMIT OF DETECTION FOR PERSONNEL DOSIMETRY SYSTEMS - REPLY SO HEALTH PHYSICS LA English DT Letter C1 US DOE, IDAHO OPERAT OFF, IDAHO FALLS, ID 83402 USA. RP ROBERSON, PL (reprint author), PROVIDENCE CANC CTR, 22301 FOSTER WINTER DR, SOUTHFIELD, MI 48075 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD AUG PY 1992 VL 63 IS 2 BP 235 EP 235 PG 1 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA JE630 UT WOS:A1992JE63000019 ER PT J AU KANTOWITZ, BH AF KANTOWITZ, BH TI SELECTING MEASURES FOR HUMAN-FACTORS RESEARCH SO HUMAN FACTORS LA English DT Article AB Selecting measures is a necessary component of human factors research. Proper selection must take into account the representation problem (how is the assignment of numbers to objects or phenomena justified?) and the uniqueness problem (to what degree is this assignment unique?). Other key human factors measurement issues include subject representativeness, variable representativeness, and setting representativeness. It is difficult to create a single measure that captures essential characteristics of complex systems. Several examples illustrate how theory can guide measurement selection in such diverse human factors research as vigilance, turning off warning alarms, information requirements for military command centers, subjective workload, heart-rate signal analysis, and heat stress in nuclear power plants. RP KANTOWITZ, BH (reprint author), BATTELLE SEATTLE RES CTR,HUMAN AFFAIRS RES CTR,POB 5395,4000 NE 41ST ST,SEATTLE,WA 98105, USA. NR 33 TC 33 Z9 33 U1 1 U2 4 PU HUMAN FACTORS SOC PI SANTA MONICA PA BOX 1369, SANTA MONICA, CA 90406 SN 0018-7208 J9 HUM FACTORS JI Hum. Factors PD AUG PY 1992 VL 34 IS 4 BP 387 EP 398 PG 12 WC Behavioral Sciences; Engineering, Industrial; Ergonomics; Psychology, Applied; Psychology SC Behavioral Sciences; Engineering; Psychology GA JK876 UT WOS:A1992JK87600002 PM 1398681 ER PT J AU HILL, SG IAVECCHIA, HP BYERS, JC BITTNER, AC ZAKLAD, AL CHRIST, RE AF HILL, SG IAVECCHIA, HP BYERS, JC BITTNER, AC ZAKLAD, AL CHRIST, RE TI COMPARISON OF 4 SUBJECTIVE WORKLOAD RATING-SCALES SO HUMAN FACTORS LA English DT Article AB Four subjective workload scales were compared along four dimensions: sensitivity, operator acceptance, resource requirements, and special procedures. The scales were the Modified Cooper-Harper scale, the National Aeronautics and Space Administration Task Load Index (TLX), the Overall Workload (OW) scale, and the Subjective Workload Assessment Technique. Three U.S. Army systems were studied for potential workload concerns. Data from five different studies on the three systems were compared along the aforementioned four dimensions. Results indicate that all four scales are acceptable tools and are sensitive to different levels of workload. However, TLX and OW are consistently superior when considering sensitivity, as measured by factor validity, and operator acceptance. This research is an example of a systematic approach for examining human factors measurement tools. C1 COMP SCI CORP,MOORESTOWN,NJ. BATTELLE HUMAN AFFAIRS RES CTR,SEATTLE,WA. CHI SYST,SPRING HOUSE,PA. USA,RES INST,FT BLISS,TX. RP HILL, SG (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,HUMAN FACTORS RES UNIT,POB 1625,IDAHO FALLS,ID 83415, USA. NR 25 TC 110 Z9 121 U1 1 U2 11 PU HUMAN FACTORS SOC PI SANTA MONICA PA BOX 1369, SANTA MONICA, CA 90406 SN 0018-7208 J9 HUM FACTORS JI Hum. Factors PD AUG PY 1992 VL 34 IS 4 BP 429 EP 439 PG 11 WC Behavioral Sciences; Engineering, Industrial; Ergonomics; Psychology, Applied; Psychology SC Behavioral Sciences; Engineering; Psychology GA JK876 UT WOS:A1992JK87600005 ER PT J AU FRANK, D AF FRANK, D TI AI APPLICATIONS IN TRANSPORTATION ENGINEERING SO IEEE EXPERT-INTELLIGENT SYSTEMS & THEIR APPLICATIONS LA English DT Editorial Material RP FRANK, D (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0885-9000 J9 IEEE EXPERT JI IEEE Expert-Intell. Syst. Appl. PD AUG PY 1992 VL 7 IS 4 BP 79 EP 81 PG 3 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA JH885 UT WOS:A1992JH88500010 ER PT J AU SEO, JW KETTERSON, AA BALLEGEER, DG CHENG, KY ADESIDA, I LI, XN GESSERT, T AF SEO, JW KETTERSON, AA BALLEGEER, DG CHENG, KY ADESIDA, I LI, XN GESSERT, T TI A COMPARATIVE-STUDY OF METAL-SEMICONDUCTOR METAL PHOTODETECTORS ON GAAS WITH INDIUM TIN OXIDE AND TI/AU ELECTRODES SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article AB Metal-semiconductor-metal (MSM) photodiodes with interdigitated indium-tin-oxide (ITO) electrodes have been fabricated on undoped GaAs using reactive-ion-etching in a methane plasma. The responsivity of ITO-MSM's is measured to be approximately 0.8 A / W, which is twice that of conventional Ti / Au-MSM's under normal operational bias conditions at lambda = 850 nm. This higher responsivity is attributed to the transparency of the ITO electrodes. ITO-MSM's exhibited a linear optical response over a wider bias range than Ti / Au-MSM's. Also, a higher breakdown voltage was measured for ITO-MSM's. The bandwidths of ITO and Ti / Au-MSM's fabricated on the same semiconductor layer with 1-mu-m fingers and spaces were measured to be 6 and 9 GHz, respectively. The slower response of the ITO-MSM's is due to the longer transit time of the carriers generated beneath the ITO electrodes. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP SEO, JW (reprint author), UNIV ILLINOIS,DEPT ELECT & COMP ENGN,CTR COMPOUND SEMICOND MICROELECTR,URBANA,IL 61801, USA. NR 12 TC 26 Z9 26 U1 1 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD AUG PY 1992 VL 4 IS 8 BP 888 EP 890 DI 10.1109/68.149898 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA JH068 UT WOS:A1992JH06800026 ER PT J AU WARNE, LK CHEN, KC AF WARNE, LK CHEN, KC TI A SIMPLE TRANSMISSION-LINE MODEL FOR NARROW SLOT APERTURES HAVING DEPTH AND LOSSES SO IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY LA English DT Article ID ELECTROMAGNETIC TRANSMISSION AB A simple transmission line model is given to approximately represent a narrow slot aperture having depth when the conductivity of the conducting plane (and slot walls) is large but not necessarily infinite and when somewhat lossy gaskets are placed in the slot. Slot and gasket dimensions in addition to the electrical parameters of the conducting plane and gasket are restricted so that gasket and wall loss effects only need to be included locally (near the slot cross section) and furthermore so that the slot voltage is nearly constant locally (however diffusion into the depth of the slot is considered when very lossy gaskets are introduced). Normal incidence is focused on since this is typically the most important case for slots that are not too long compared to the wavelength. The transmission line model is used to obtain simple approximate formulas for resonant quality factor, slot voltage, penetrant fields, and transmitted power. Low frequency quantities including magnetic dipole moments are also obtained. Gaskets with air gaps are considered and optimum choices for electrical parameters are discussed. RP WARNE, LK (reprint author), SANDIA NATL LABS,DIV EM ANAL,TECH STAFF,ALBUQUERQUE,NM 87185, USA. NR 13 TC 10 Z9 10 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9375 J9 IEEE T ELECTROMAGN C JI IEEE Trans. Electromagn. Compat. PD AUG PY 1992 VL 34 IS 3 BP 173 EP 182 DI 10.1109/15.155827 PN 1 PG 10 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA JJ864 UT WOS:A1992JJ86400006 ER PT J AU YEE, JH MAYHALL, DJ SIEGER, GE AF YEE, JH MAYHALL, DJ SIEGER, GE TI MODELING THE INTERACTION OF INTENSE ELECTROMAGNETIC PULSES WITH GASEOUS MEDIA SO IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY LA English DT Article ID PROPAGATION; IONIZATION; AIR AB In this article, we present some results obtained from our recent theoretical investigations of the interaction of intense electromagnetic pulses with gases when the field strength is above the threshold for avalanche breakdown. We show how the breakdown affects the shapes of the pulses. In addition, we discuss the accuracy of our calculational models by comparing some calculations with experimental data. It must be noted that this is not a comprehensive review of the field of microwave breakdown. RP YEE, JH (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 22 TC 4 Z9 5 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9375 J9 IEEE T ELECTROMAGN C JI IEEE Trans. Electromagn. Compat. PD AUG PY 1992 VL 34 IS 3 BP 189 EP 196 DI 10.1109/15.155829 PN 1 PG 8 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA JJ864 UT WOS:A1992JJ86400008 ER PT J AU HOEBERLING, RF FAZIO, MV AF HOEBERLING, RF FAZIO, MV TI ADVANCES IN VIRTUAL CATHODE MICROWAVE SOURCES SO IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY LA English DT Article ID RESONANT CAVITY; ELECTRON-BEAMS; VIRCATOR; GENERATION; OSCILLATOR; FEATURES; EMISSION; PLASMA; FLOW AB The evolution of the virtual cathode microwave source is present. The current performance is described Areas for future development are discussed. C1 LOS ALAMOS NATL LAB,HIGH POWER MICROWAVE SOURCES & EFFECT GRP,MICROWAVE VL&E PROJECT,LOS ALAMOS,NM 87545. RP HOEBERLING, RF (reprint author), LOS ALAMOS NATL LAB,DIV ACCELERATOR TECHNOL,LOS ALAMOS,NM 87545, USA. NR 61 TC 15 Z9 15 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 0018-9375 J9 IEEE T ELECTROMAGN C JI IEEE Trans. Electromagn. Compat. PD AUG PY 1992 VL 34 IS 3 BP 252 EP 258 DI 10.1109/15.155837 PN 1 PG 7 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA JJ864 UT WOS:A1992JJ86400016 ER PT J AU PERL, ML NIEMI, GD AF PERL, ML NIEMI, GD TI THE TAU-CHARM-FACTORY - CONCEPT AND CONSTRUCTION SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB The first part of this paper explains the tau-charm factory concept: a high luminosity, low-energy, two-ring, electron-positron collider which enables precise and probing studies of the physics of the charm quark, tau lepton, and tau neutrino. The second part describes the plans for construction of a tau-charm factory in Spain. RP PERL, ML (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 29 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 486 EP 493 DI 10.1109/23.159653 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300001 ER PT J AU WOODY, CL KIERSTEAD, JA LEVY, PW STOLL, S AF WOODY, CL KIERSTEAD, JA LEVY, PW STOLL, S TI RADIATION-DAMAGE IN BAF2 CRYSTALS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE ID BARIUM FLUORIDE SCINTILLATOR AB The effects of radiation damage and recovery have been studied in BaF2 crystals exposed to Co-60 radiation. The change in optical transmission and scintillation light output have been measured as a function of dose up to 4.7 x 10(6) rad. Although some crystals exhibit a small change in transmission, a greater change in scintillation light output is observed. Several 25 cm long crystals which have been irradiated show large changes in both transmission and light output. Recovery from radiation damage has been studied as a function of time and exposure to UV light. A long lived radiation induced phosphorescence has been observed in all irradiated samples which is distinct from the standard fast and slow scintillation emissions. The emission spectrum of the phosphorescence has been measured and shows a peak at approximately 330 nm, near the region of the slow scintillation component. Results are given on the dependence of the decay time of the phosphorescence with dose. RP WOODY, CL (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 9 TC 6 Z9 6 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 515 EP 523 DI 10.1109/23.159658 PG 9 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300006 ER PT J AU WOODY, CL KIERSTEAD, JA LEVY, PW STOLL, S AF WOODY, CL KIERSTEAD, JA LEVY, PW STOLL, S TI RADIATION-DAMAGE IN UNDOPED CSI AND CSI(TL) SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE ID CRYSTALS AB Radiation damage has been studied in undoped CsI and CsI(Tl) crystals using Co-60 gamma radiation for doses up to approximately 4.2 x 10(6). Samples from various manufacturers were measured ranging in size from 2.54 cm long cylinders to a 30 cm long block. Measurements were made on the change in optical transmission and scintillation light output as a function of dose. Although some samples showed a small change in transmission, a significant change in light output was observed for all samples. Recovery from damage was also studied as a function of time and exposure to UV light. A short lived phosphorescence was observed in undoped CsI, similar to the phosphorescence seen in CsI(Tl). RP WOODY, CL (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 12 TC 34 Z9 35 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 524 EP 531 DI 10.1109/23.159659 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300007 ER PT J AU WEI, C ZHENG, L KRANER, HW AF WEI, C ZHENG, L KRANER, HW TI APPLICATION OF THE RAPID THERMAL-PROCESS - SINTERING THE SPUTTERED ALUMINUM SILICON CONTACT IN SILICON DETECTOR FABRICATION SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE ID ALLOYS AB Rapid thermal process (RTP) sintering of aluminium metalization has been used in p+-n junction detector fabrication. For the same thickness of aluminum film and at the same RTP sintering condition, the leakage current of the p+-n junction detectors with sputtered Al metalization showed at least a 50% improvement after sintering and no spiking phenomena were observed compared to the detectors with evaporated Al contacts. RTP sintering in 4 % H2/N2 ambient passivates the defects introduced by sputtering and the damage caused by the Co-60 irradiation. RP WEI, C (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 8 TC 2 Z9 2 U1 2 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 558 EP 562 DI 10.1109/23.159665 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300013 ER PT J AU ROSSINGTON, CS GIAUQUE, RD JAKLEVIC, JM AF ROSSINGTON, CS GIAUQUE, RD JAKLEVIC, JM TI A DIRECT COMPARISON OF GE AND SI(LI) DETECTORS IN THE 2-20 KEV RANGE SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE ID MONTE-CARLO SIMULATION; X-RAY-DETECTORS; INTERACTION MECHANISMS; RESPONSE FUNCTIONS; SPECTRA AB The spectral response of high purity Ge (HPGe) and lithium-drifted Si (Si(Li)) surface barrier detectors of similar geometry has been measured over a range of x-ray energies under identical experimental conditions. Detector characteristics such as spectral background, escape peak intensity, entrance window absorption, and energy resolution are presented and compared. Although these characteristics have been discussed in the literature previously, this paper represents an attempt to consolidate the information by making comparisons under equivalent experimental conditions for the two types of detectors. A primary goal of the study is a comparison of the two types of detectors for use in x-ray fluorescence applications. RP ROSSINGTON, CS (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 17 TC 8 Z9 8 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 570 EP 576 DI 10.1109/23.159667 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300015 ER PT J AU LI, Z KRANER, HW AF LI, Z KRANER, HW TI FAST-NEUTRON RADIATION EFFECTS IN SILICON DETECTORS FABRICATED BY DIFFERENT THERMAL-OXIDATION PROCESSES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE ID DAMAGE AB High resistivity silicon detectors along with MOS capacitors made on five silicon dioxides with different thermal conditions (975-degrees-C to 1200-degrees-C) have been exposed to fast neutron irradiation up to the fluence of a few times 10(14) n/cm2. New measurement techniques such as capacitance-voltage (C-V) of MOS capacitors and current-voltage (I-V) of back to back diodes (p+-n--p+ if n- is not inverted to p) or resistors (p+-p-p+ if inverted) have been introduced in this study in monitoring the possible type-inversion (n --> p) under high neutron fluence. No type-inversion in the material underneath SiO2 and the p+ contact has been observed so far in this work for detectors made on the five oxides up to the neutron fluence of a few times 10(13) n/cm2. However, it has been found that detectors made on higher temperature oxides (T greater-than-or-equal-to 1100-degrees-C) exhibit less leakage current increase at high neutron fluence (phi greater-than-or-equal-to 10(13) n/cm2). RP LI, Z (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 13 TC 16 Z9 16 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 577 EP 583 DI 10.1109/23.159668 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300016 ER PT J AU DRUMM, CR HOHLFELDER, JJ KOTULSKI, JD SCRIVNER, GJ MILLS, GS TANAKA, TJ AF DRUMM, CR HOHLFELDER, JJ KOTULSKI, JD SCRIVNER, GJ MILLS, GS TANAKA, TJ TI EFFICIENT MODELING OF COMPTON DIODE GAMMA-RADIATION DETECTORS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB The CEPXS/ONELD code package proves to be significantly more efficient than electron Monte Carlo for computing spherical Compton diode response to gamma irradiation, requiring only minutes instead of hours of Cray computer time. The adjoint capability of CEPXS/ONELD allows the complete energy-angle response of a Compton diode to be determined with a single transport calculation. The method is a useful tool for determining new Compton-diode designs with desired energy-response characteristics. RP DRUMM, CR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 584 EP 589 DI 10.1109/23.159669 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300017 ER PT J AU LUKE, PN CORK, CP MADDEN, NW ROSSINGTON, CS WESELA, MF AF LUKE, PN CORK, CP MADDEN, NW ROSSINGTON, CS WESELA, MF TI AMORPHOUS-GE BIPOLAR BLOCKING CONTACTS ON GE DETECTORS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE ID GERMANIUM DETECTORS AB Electrical contacts formed using sputtered amorphous Ge (a-Ge) films on high-purity Ge crystals, both n- and p-type, were found to exhibit good blocking behavior with low leakage currents, with the contact biased under either voltage polarity. The a-Ge contacts have thin dead layers associated with them and can be used in place of lithium-diffused ion-implanted or Schottky barrier contacts on Ge radiation detectors. The use of such contacts allows fabrication of multi-electrode detectors by means of simple processing steps. RP LUKE, PN (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 12 TC 60 Z9 60 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 590 EP 594 DI 10.1109/23.159670 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300018 ER PT J AU AHMAD, S BONNER, BE BUCHANAN, JA CLEMENT, JM EMPL, A MUTCHLER, GS TOSHKOV, S EISEMAN, SE ETKIN, A FOLEY, KJ HACKENBURG, RW LONGACRE, RS LOVE, WA MORRIS, TW PLATNER, ED SAULYS, AC CHAN, CS KRAMER, MA LINDENBAUM, SJ HALLMAN, TJ MADANSKY, L PEASLEE, DC AF AHMAD, S BONNER, BE BUCHANAN, JA CLEMENT, JM EMPL, A MUTCHLER, GS TOSHKOV, S EISEMAN, SE ETKIN, A FOLEY, KJ HACKENBURG, RW LONGACRE, RS LOVE, WA MORRIS, TW PLATNER, ED SAULYS, AC CHAN, CS KRAMER, MA LINDENBAUM, SJ HALLMAN, TJ MADANSKY, L PEASLEE, DC TI A SILICON MULTIPLICITY DETECTOR SYSTEM FOR AN EXPERIMENT ON THE INTERACTION OF ANTIPROTONS WITH NUCLEI AT BNL SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE ID 4 GEV/C; STRANGENESS PRODUCTION AB A Large Angle Multiplicity Detector (LAMD) system has been developed and used at the BNL experiment E854: Antiproton Nucleus Interactions. This system performed well with an energetic antiproton beam. Charged particle multiplicity distributions from pBAR annihilations were measured. We discuss the design and performance of the LAMD system in this paper. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. UNIV MARYLAND,COLL PK,MD 20742. CUNY CITY COLL,NEW YORK,NY 10031. RP AHMAD, S (reprint author), RICE UNIV,TW BONNER NUCL LAB,HOUSTON,TX 77251, USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 615 EP 618 DI 10.1109/23.159675 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300023 ER PT J AU CHEN, W KRANER, H LI, Z REHAK, P GATTI, E LONGONI, A SAMPIETRO, M HOLL, P KEMMER, J FASCHINGBAUER, U SCHMITT, B WORNER, A WURM, JP AF CHEN, W KRANER, H LI, Z REHAK, P GATTI, E LONGONI, A SAMPIETRO, M HOLL, P KEMMER, J FASCHINGBAUER, U SCHMITT, B WORNER, A WURM, JP TI LARGE AREA CYLINDRICAL SILICON DRIFT DETECTOR SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB An advanced silicon drift detector, a large area cylindrical drift detector, was designed, produced, tested and installed in the NA45 experiment. The active area of the detector is practically the total area of a 3 inch diameter wafer. Signal electrons created in the silicon detector by fast charged particles drift radially outside toward an array of 360 anodes located on the periphery of the detector. The drift time measures the radial coordinate of the particle's intersection; the charge sharing between anodes measures the azimuthal coordinate. The detector provides unambiguous pairs of r,phi coordinates for events with multiplicities up to several hundred. Its use in the experiment aims at a position resolution of 20 mum (rms) in each direction giving about 2.10(6) two-dimensional elements. There is a small hole in the center of the detector to allow the passage of the noninteracting particle beam. The longest drift distance is about 3 cm. The nominal value of the drift field is 500 V/cm resulting in a maximum drift time of 4 mus. C1 POLITECN MILAN,I-20133 MILAN,ITALY. TECH UNIV MUNICH,W-8046 GARCHING,GERMANY. KETEK GMBH,W-8048 HAIMHAUSEN,GERMANY. MAX PLANCK INST NUCL PHYS,W-6900 HEIDELBERG 1,GERMANY. RP CHEN, W (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Schmitt, Bernd/H-9365-2013; Sampietro, Marco/A-3732-2016 OI Schmitt, Bernd/0000-0002-5778-0680; Sampietro, Marco/0000-0003-4825-9612 NR 5 TC 39 Z9 39 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 619 EP 628 DI 10.1109/23.159676 PG 10 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300024 ER PT J AU MIRESHGHI, A CHO, G DREWERY, J JING, T KAPLAN, SN PEREZMENDEZ, V WILDERMUTH, D AF MIRESHGHI, A CHO, G DREWERY, J JING, T KAPLAN, SN PEREZMENDEZ, V WILDERMUTH, D TI AMORPHOUS-SILICON POSITION-SENSITIVE NEUTRON DETECTOR SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB In this work, we present an investigation of the possibility of using an a-Si:H diode, coated with an appropriate converter, as a position sensitive neutron detector. Our Monte Carlo simulation predicts that using a Gd film, approximately 2mum thick, coated on a sufficiently thick amorphous silicon n-i-p diode, we can achieve a neutron detection efficiency of 25 percent. The experimental results presented give an average signal size of about 12000 e- per neutron interaction, which is well above the noise and is in good agreement with the expected values. We can also fabricate pixel detectors with element size as small as 300 mum and still register a count rate of 2200 events/sec in a typical neutron flux situation of about 10(7) n/cm2sec. The fact that these detectors are not sensitive to gamma rays, and show excellent radiation hardness, make them good candidates for applications such as neutron imaging, neutron crystallography and neutron scattering. RP MIRESHGHI, A (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Cho, Gyuseong/C-1527-2011 NR 12 TC 21 Z9 21 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 635 EP 640 DI 10.1109/23.159678 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300026 ER PT J AU CHO, GS QURESHI, S DREWERY, JS JING, T KAPLAN, SN LEE, H MIRESHGHI, A PEREZMENDEZ, V WILDERMUTH, D AF CHO, GS QURESHI, S DREWERY, JS JING, T KAPLAN, SN LEE, H MIRESHGHI, A PEREZMENDEZ, V WILDERMUTH, D TI NOISE IN A-SI-H P-I-N DETECTOR DIODES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE ID AMORPHOUS-SILICON AB Noise of a-Si:H p-i-n diodes (5 approximately 50 mum thick) under reverse bias was investigated. The current dependent 1/f type noise was found to be the main noise component at high bias. At low bias the thermal noise from a series resistance of the p-layer and of the metallic contacts is the dominant noise source which is unrelated to the reverse current through the diode. The noise associated with the p-layer resistance decreased significantly on annealing under reverse bias, reducing the total zero bias noise by a factor of 2 approximately. The noise recovered to the original value on subsequent annealing without bias. In addition to the resistive noise these seems to be a shaping time independent noise component at zero biased diodes. RP CHO, GS (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Cho, Gyuseong/C-1527-2011 NR 11 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 641 EP 644 DI 10.1109/23.159679 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300027 ER PT J AU ABE, K ANTILOGUS, P ASTON, D BAIRD, K BEAN, A BIENZ, T BIRD, F CALDWELL, D CAVALLISFORZA, M COYLE, P COYNE, D DASU, S DOLINSKY, S DOLIVEIRA, A DUBOSCQ, J DUNWOODIE, W GAGNON, P HALLEWELL, G HASEGAWA, K HUBER, J JACQUES, P JOHNSON, RA KALELKAR, M KAWAHARA, H KWON, Y LEITH, DWGS LIU, X LU, A MARTINEZ, J MATHYS, L MCHUGH, S MEADOWS, B MULLER, D NAGAMINE, T NUSSBAUM, M PAVEL, TJ PLANO, R RATCLIFF, B RENSING, P SANTHA, AKS SCHULTZ, D SHAPIRO, S SHOUP, A SIMOPOULOS, C SOKOLOFF, M SOLODOV, E STAMER, P STOCKDALE, I SUEKANE, F TOGE, N VAVRA, J WHITAKER, JS WILLIAMS, DA WILLIAMS, SH WITHERELL, M WILSON, RJ WORD, G YELLIN, S YUTA, H AF ABE, K ANTILOGUS, P ASTON, D BAIRD, K BEAN, A BIENZ, T BIRD, F CALDWELL, D CAVALLISFORZA, M COYLE, P COYNE, D DASU, S DOLINSKY, S DOLIVEIRA, A DUBOSCQ, J DUNWOODIE, W GAGNON, P HALLEWELL, G HASEGAWA, K HUBER, J JACQUES, P JOHNSON, RA KALELKAR, M KAWAHARA, H KWON, Y LEITH, DWGS LIU, X LU, A MARTINEZ, J MATHYS, L MCHUGH, S MEADOWS, B MULLER, D NAGAMINE, T NUSSBAUM, M PAVEL, TJ PLANO, R RATCLIFF, B RENSING, P SANTHA, AKS SCHULTZ, D SHAPIRO, S SHOUP, A SIMOPOULOS, C SOKOLOFF, M SOLODOV, E STAMER, P STOCKDALE, I SUEKANE, F TOGE, N VAVRA, J WHITAKER, JS WILLIAMS, DA WILLIAMS, SH WITHERELL, M WILSON, RJ WORD, G YELLIN, S YUTA, H TI INITIAL PERFORMANCE OF THE SLD CHERENKOV RING IMAGING DETECTOR SYSTEM SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB All of the major subsystems for the barrel Cherenkov Ring Imaging Detector (CRID) in the SLD at SLAC have now been commissioned. The CRID participated in the SLD engineering run of June-August 1991. In a cosmic ray test at the end of the run, Cherenkov rings were observed for the first time. Initial data from the CRID, including Cherenkov rings, studies of minimum ionizing particles, and data from the fiber optics calibration system are presented here. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR,STANFORD,CA 94309. RUTGERS STATE UNIV,SERIN PHYS LAB,PISCATAWAY,NJ 08855. UNIV CINCINNATI,DEPT PHYS,CINCINNATI,OH 45221. BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. UNIV CALIF SANTA CRUZ,SANTA CRUZ PARTICLE PHYS,SANTA CRUZ,CA 95064. RP ABE, K (reprint author), TOHOKU UNIV,DEPT PHYS,SENDAI,MIYAGI 980,JAPAN. 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 8 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 685 EP 689 DI 10.1109/23.159688 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300036 ER PT J AU ETKIN, A EISEMAN, SE FOLEY, KJ HACKENBURG, RW LONGACRE, RS LOVE, WA MORRIS, TW PLATNER, ED SAULYS, AC LINDENBAUM, SJ CHAN, CS KRAMER, MA ZHAO, KH ZHU, Y HALLMAN, TJ MADANSKY, L AHMAD, S BONNER, BE BUCHANAN, JA CHIOU, CN CLEMENT, JM MUTCHLER, GS ROBERTS, JB AF ETKIN, A EISEMAN, SE FOLEY, KJ HACKENBURG, RW LONGACRE, RS LOVE, WA MORRIS, TW PLATNER, ED SAULYS, AC LINDENBAUM, SJ CHAN, CS KRAMER, MA ZHAO, KH ZHU, Y HALLMAN, TJ MADANSKY, L AHMAD, S BONNER, BE BUCHANAN, JA CHIOU, CN CLEMENT, JM MUTCHLER, GS ROBERTS, JB TI BEHAVIOR OF TPCS IN A HIGH PARTICLE-FLUX ENVIRONMENT SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB TPC's (Time Projection Chamber) used in E-810 at the AGS (Alternating Gradient Synchrotron) were exposed to fluxes equivalent to more than 10(7) minimum ionizing particles per second to find if such high fluxes cause gain changes or distortions of the electric field. Initial results of these and other tests are presented and the consequences for the RHIC (Relativistic Heavy Ion Collider) TPC-based experiments are discussed. C1 CUNY CITY COLL,NEW YORK,NY 10031. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. RICE UNIV,BONNER NUCL LAB,HOUSTON,TX 77251. RP ETKIN, A (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 3 TC 1 Z9 1 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 696 EP 700 DI 10.1109/23.159690 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300038 ER PT J AU YAREMA, RJ ZIMMERMAN, T WILLIAMS, W BINKLEY, M HUFFMAN, T WAGNER, R AF YAREMA, RJ ZIMMERMAN, T WILLIAMS, W BINKLEY, M HUFFMAN, T WAGNER, R TI A HIGH-PERFORMANCE MULTICHANNEL PREAMPLIFIER ASIC SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB A new preamplifier ASIC has been designed and built to improve performance of the VTPC (Vertex Time Projection Chamber) at Fermilab's Colliding Detector Facility. Design of the semicustom IC was completed using a Tektronix QuickChip 2S bipolar linear array. The ASIC has 6 channels on a chip and provides lower noise, higher gain, lower power, and lower mass packaging than the device which it replaces. Actual performance of the preamplifier was found to match very closely the stimulated performance. To reduce the mass of the complete circuit board, bare IC dice were mounted directly on a G-10 substrate using COB (chip on board) techniques. The preamplifier and packaging should be applicable to numerous other systems. RP YAREMA, RJ (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 1 TC 14 Z9 14 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 742 EP 746 DI 10.1109/23.159698 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300046 ER PT J AU TURKO, BT LUK, KB GIDAL, G ZIZKA, G KAPLAN, D MCGAUGLEY, P LILLBERG, J MISHRA, S BROWN, CC AF TURKO, BT LUK, KB GIDAL, G ZIZKA, G KAPLAN, D MCGAUGLEY, P LILLBERG, J MISHRA, S BROWN, CC TI A MULTICHANNEL DISCRIMINATOR SYSTEM FOR SILICON STRIP DETECTOR READOUT SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE ID HIGH-SPEED; PREAMPLIFIER AB Up to 9216 fast discriminators are required for processing signals of the Fermilab silicon strip detector preamplifiers in experiment E789. Signals exceeding a preset discriminator threshold voltage are first stored in a clocked latch and then delayed by three 19 ns clock cycles with a shift register. Discriminators are organized in 75 identical 128-channel subsystems. Each has four 32-channel P.C. boards housed in a signal muting motherboard. Eight 16-channel line driver boards transfer events from the motherboard through cables to the remote processing electronics. Three subsystems fit into the frame of a standard CAMAC crate. We describe the design considerations of the system and its performance, based on several months of testing the completed system. C1 NO ILLINOIS UNIV,DE KALB,IL 60115. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP TURKO, BT (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 3 TC 3 Z9 3 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 758 EP 761 DI 10.1109/23.159701 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300049 ER PT J AU MILGROME, OB KLEINFELDER, SA LEVI, ME AF MILGROME, OB KLEINFELDER, SA LEVI, ME TI A 12-BIT ANALOG TO DIGITAL CONVERTER FOR VLSI APPLICATIONS IN NUCLEAR-SCIENCE SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB A high density monolithic analog to digital converter (ADC) has been designed and tested. The ADC features small silicon area and low power consumption for use in multichannel circuits for massively parallel particle physics detectors. The tested chip contains a linear ramp, precision high speed comparators, a pipelined counter, and double buffering storage latches fabricated in a 2 micron 2 polysilicon complementary metal-oxide-semiconductor (CMOS) technology. The prototype integrated circuit successfully combines digital frequencies in excess of 70 MHz, with analog signals smaller than 1 mV. Test results show 1/4096 rms errors at conversion rates above 30 KHz, with less than 4 mW per channel power dissipation. RP MILGROME, OB (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 7 TC 15 Z9 15 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 771 EP 775 DI 10.1109/23.159704 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300052 ER PT J AU CRAWLEY, HB MCKAY, R MEYER, WT ROSENBERG, EI THOMAS, WD AF CRAWLEY, HB MCKAY, R MEYER, WT ROSENBERG, EI THOMAS, WD TI PERFORMANCE OF FLASH ADCS IN THE 100 MHZ RANGE .2. RESULTS FROM 8-BIT DEVICES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB Using a test bench described at this symposium last year, we have performed tests on 8 bit flash ADCs from Sony and Analog Devices. For each device we have measured parameters such as linearity, number of effective bits, noise level, aperture jitter, integral and differential nonlinearity, analog bandwidth, and total harmonic distortion. The goal of these tests is to find cost effective solutions to data acquisition problems in SSC and LHC experiments. Future work will include ten and twelve bit ADCs. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. NR 4 TC 4 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 780 EP 783 DI 10.1109/23.159706 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300054 ER PT J AU HALBIG, JK KLOSTERBUER, SF STEPHENS, MM BIDDLE, RS AF HALBIG, JK KLOSTERBUER, SF STEPHENS, MM BIDDLE, RS TI MINIATURE-MCA TECHNOLOGY DEVELOPMENT SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB We have recently reduced the size of multichannel analyzers (MCAs) and have implemented more features in hardware to relieve software requirements. We built and tested a spectroscopy grade, 4096-channel MCA. Exclusive of amplifier and power supply, it fits on two boards each approximately 7 by 15 cm. This paper discusses the features and performance of the analyzer and some reasonable applications of these technologies. RP HALBIG, JK (reprint author), LOS ALAMOS NATL LAB,SAFEGUARDS ASSAY GRP N-1,MS E540,LOS ALAMOS,NM 87545, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 798 EP 803 DI 10.1109/23.159710 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300058 ER PT J AU HOLLAND, S AF HOLLAND, S TI PROPERTIES OF CMOS DEVICES AND CIRCUITS FABRICATED ON HIGH-RESISTIVITY, DETECTOR-GRADE SILICON SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB A CMOS process that is compatible with silicon p-i-n radiation detectors has been developed and characterized. A total of twelve mask layers are used in the process. The NMOS device is formed in a retrograde well while the PMOS device is fabricated directly in the high-resistivity silicon. Isolation characteristics are similar to a standard foundary CMOS process. Circuit performance using 3 mum design rules has been. evaluated. The measured propagation delay and power-delay product for a 5 1 -stage ring oscillator was 1.5 ns and 43 fJ, respectively. Measurements on a simple cascode amplifier results in a pin-bandwidth product of 200 MHz at a bias current of 15 muA. The input-referred noise of the cascode amplifier is 20 nV/square-root Hz at 1 MHz. RP HOLLAND, S (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Holland, Stephen/H-7890-2013 NR 8 TC 5 Z9 5 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 809 EP 813 DI 10.1109/23.159712 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300060 ER PT J AU UTES, M JOHNSON, M MARTIN, M AF UTES, M JOHNSON, M MARTIN, M TI A TRD TRIGGER FOR THE TEVATRON COLLIDER EXPERIMENT AT D0 SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB A VME-based module for use as an input to the DO Detector Level 1.5 Trigger is described. Its main function will be the confirmation of electron candidates flagged by the First Level Calorimeter Trigger using digitized data from the Transition Radiation Detector. Features of the board include the use of fast FIFOs to store incoming track coordinates, dual ported SRAM lookup tables for addressing integrated charge data and forming scalars, multiplier/accumulators for speed of calculation, and a single synchronous finite state machine to control all board operations. RP UTES, M (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 5 TC 0 Z9 0 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 832 EP 837 DI 10.1109/23.159716 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300064 ER PT J AU ROTOLO, C FACHIN, M CHAPPA, S RAUCH, M NEEDLES, C DYER, A AF ROTOLO, C FACHIN, M CHAPPA, S RAUCH, M NEEDLES, C DYER, A TI THE FERMILAB D0 MASTER CLOCK SYSTEM SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB The Clock System provides bunch-crossing-related timing signals to various detector subsystems. Accelerator synchronization and monitoring as well as timing signal generation and distribution are discussed. The system is built using three module types implemented in Eurostandard hardware with a VME communications interface. The first two types of modules are used to facilitate synchronization with the accelerator and to generate 23 timing signals that are programmable with one RF bucket (18.8 ns) resolution and 1 ns accuracy. Fifty-four of the third module type are used to distribute the timing signals and two synchronous 53 MHz and 106 MHz clocks to various detector subsystems. RP ROTOLO, C (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 858 EP 863 DI 10.1109/23.159721 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300069 ER PT J AU TURNER, KJ NELSON, CA SHAW, TM WESSON, TR AF TURNER, KJ NELSON, CA SHAW, TM WESSON, TR TI CONTROL AND DATA ACQUISITION ELECTRONICS FOR THE CDF SILICON VERTEX DETECTOR SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB A control and data acquisition system has been designed for the CDF Silicon Vertex Detector (SVX) at Fermilab. The system controls the operation of the SVX Rev D integrated circuit[1] (SVX IC) that is used to instrument a 46,000 microstrip silicon detector[2]. The system consists of a Fastbus Sequencer, a Crate Controller and Digitizer modules. RP TURNER, KJ (reprint author), FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 869 EP 874 DI 10.1109/23.159723 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300071 ER PT J AU ABE, K ANTILOGUS, P ASTON, D BAIRD, K BEAN, A BIENZ, T BIRD, F CALDWELL, D CAVALLISFORZA, M COYLE, P COYNE, D DASU, S DOLINSKY, S DOLIVEIRA, A DUBOSCQ, J DUNWOODIE, W GAGNON, P HALLEWELL, G HASEGAWA, K HOEFLICH, J HUBER, J JACQUES, P JOHNSON, RA KALELKAR, M KAWAHARA, H KWON, Y LEITH, DWGS LIU, X LU, A MARSHALL, D MARTINEZ, J MATHYS, L MCHUGH, S MEADOWS, B MULLER, D NAGAMINE, T NUSSBAUM, M OXOBY, G PAVEL, TJ PLANO, R RATCLIFF, B RENSING, P SANTHA, AKS SCHULTZ, D SHAPIRO, S SHOUP, A SIMOPOULOS, C SOKOLOFF, MD SOLODOV, E STAMER, P STILES, P STOCKDALE, I SUEKANE, F TOGE, N VAVRA, J WHITAKER, JS WILLIAMS, DA WILLIAMS, SH WITHERELL, M WILSON, RJ WORD, G YELLIN, S YUTA, H AF ABE, K ANTILOGUS, P ASTON, D BAIRD, K BEAN, A BIENZ, T BIRD, F CALDWELL, D CAVALLISFORZA, M COYLE, P COYNE, D DASU, S DOLINSKY, S DOLIVEIRA, A DUBOSCQ, J DUNWOODIE, W GAGNON, P HALLEWELL, G HASEGAWA, K HOEFLICH, J HUBER, J JACQUES, P JOHNSON, RA KALELKAR, M KAWAHARA, H KWON, Y LEITH, DWGS LIU, X LU, A MARSHALL, D MARTINEZ, J MATHYS, L MCHUGH, S MEADOWS, B MULLER, D NAGAMINE, T NUSSBAUM, M OXOBY, G PAVEL, TJ PLANO, R RATCLIFF, B RENSING, P SANTHA, AKS SCHULTZ, D SHAPIRO, S SHOUP, A SIMOPOULOS, C SOKOLOFF, MD SOLODOV, E STAMER, P STILES, P STOCKDALE, I SUEKANE, F TOGE, N VAVRA, J WHITAKER, JS WILLIAMS, DA WILLIAMS, SH WITHERELL, M WILSON, RJ WORD, G YELLIN, S YUTA, H TI PERFORMANCE OF THE FRONT END ELECTRONICS AND DATA ACQUISITION-SYSTEM FOR THE SLD CHERENKOV RING IMAGING DETECTOR SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article ID CONSTRUCTION AB The front end electronics and data acquisition system for the SLD barrel Cherenkov Ring Imaging Detector (CRID) are described. This electronics must provide a 1% charge division measurement with a maximum acceptable noise level of 2000 electrons (rms). Noise and system performance results are presented for the initial SLD engineering run data. C1 STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. RUTGERS STATE UNIV, SERIN PHYS LAB, PISCATAWAY, NJ 08855 USA. UNIV CALIF SANTA BARBARA, DEPT PHYS, SANTA BARBARA, CA 93106 USA. UNIV CALIF SANTA CRUZ, SANTA CRUZ INST PARTICLE PHYS, SANTA CRUZ, CA 95064 USA. UNIV CINCINNATI, DEPT PHYS, CINCINNATI, OH 45221 USA. BOSTON UNIV, DEPT PHYS, BOSTON, MA 02215 USA. RP ABE, K (reprint author), TOHOKU UNIV, DEPT PHYS, SENDAI, MIYAGI 980, JAPAN. 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 9 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9499 EI 1558-1578 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 897 EP 900 DI 10.1109/23.159728 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300076 ER PT J AU ANGSTADT, R JOHNSON, M MANNING, IL AF ANGSTADT, R JOHNSON, M MANNING, IL TI MODELING OF THE DZERO DATA ACQUISITION-SYSTEM SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB A queuing theory model was used in the initial design of the DZero data acquisition system. It was mainly used for the front end electronic systems. Since then the model has been extended to include the entire data path for the tracking system. The tracking system generates the most data so we expect this system to determine the overall transfer rate. The model was developed using both analytical and simulation methods for solving a series of single server queues. We describe the model and the methods used to develop it. We also present results from the original models, updated calculations representing the system as built and comparisons with measurements made with the hardware in place for the cosmic my test run. C1 TEXAS A&M UNIV SYST,DEPT PHYS,COLL STN,TX 77843. RP ANGSTADT, R (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 904 EP 909 DI 10.1109/23.159730 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300078 ER PT J AU DEAN, TD HANEY, MJ AF DEAN, TD HANEY, MJ TI FASTBUS SIMULATION TOOLS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB A generalized model of a FASTBUS master is presented. The model is used with simulation tools to aid in the specification, design, and production of FASTBUS slave modules. The model provides a mechanism to interact with the electrical schematics and software models to predict performance. The model is written in the IEEE std 1076-1987 hardware description language VHDL. A model of the ATC logic is also presented. VHDL was chosen to provide portability to various platforms and simulation tools. The models, in conjunction with most commercially available simulators, will perform all of the transactions specified in IEEE std 960-1989. The models may be used to study the behavior of electrical schematics and other software models and detect violations of the FASTBUS protocol. For example, a hardware design of a slave module could be studied, protocol violations detected and corrected before committing money to prototype development. The master model accepts a stream of high level commands from an ASCII file to initiate FASTBUS transactions. The high level command language is based on the FASTBUS standard routines listed in IEEE std 1177-1989. Using this standard-based command language to direct the model of the master, hardware engineers can simulate FASTBUS transactions in the language used by physicists and programmers to operate FASTBUS systems. C1 UNIV ILLINOIS,URBANA,IL 61801. RP DEAN, TD (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 910 EP 914 DI 10.1109/23.159731 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300079 ER PT J AU OHARA, JM HALL, RE AF OHARA, JM HALL, RE TI ADVANCED CONTROL ROOMS AND CREW PERFORMANCE ISSUES - IMPLICATIONS FOR HUMAN RELIABILITY SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE ID SKILLS AB Recent trends in advanced control room (ACR) design are considered with respect to their impact on human performance. It is concluded that potentially negative influences exist, however, a variety of factors make it difficult to model, analyze, and quantify these effects for human reliability analyses (HRAs). RP OHARA, JM (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 22 TC 41 Z9 41 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 919 EP 923 DI 10.1109/23.159733 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300081 ER PT J AU MACARTHUR, DW ALLANDER, KS BOUNDS, JA CATLETT, MM MCATEE, JL AF MACARTHUR, DW ALLANDER, KS BOUNDS, JA CATLETT, MM MCATEE, JL TI LONG-RANGE ALPHA-DETECTOR (LRAD) FOR CONTAMINATION MONITORING SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB Historically, alpha detectors have been limited by the very short range of alpha particles in air and by relatively poor sensitivity, even if the particles are intercepted. Of necessity, these detectors are operated in a vacuum or in close proximity to the source if reasonable efficiency is desired. In our new long-range alpha detector (LRAD), alpha particles interact with the ambient air, producing ionization in the air at the rate of about 30,000 ion pairs per MeV of alpha energy. These charges can be transported over significant distances (several meters) in a moving current of air generated by a small fan. An ion chamber located in front of the fan measures the current carried by the moving ions. The LRAD-based monitor is more sensitive and more thorough than conventional monitors. We present current LRAD sensitivity limits and results, practical monitor designs, and proposed uses for LRAD monitors. RP MACARTHUR, DW (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 4 TC 3 Z9 3 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 952 EP 957 DI 10.1109/23.159739 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300087 ER PT J AU CHAPMAN, TC AF CHAPMAN, TC TI GRAPHICS BASED PC ANALYSIS OF ALPHA-SPECTRA SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB Now personal computer (PC) software performs interactive analysis of alpha spectra using EGA graphics. Spectra are collected with a commercial MCA board and analyzed using the software described here. The operator is required to approve each peak integration area before analysis Sample analysis can use detector efficiencies or spike yields or both. Background corrections are made and upper limit values are calculated when specified. Nuclide identification uses a library of up to 64 nuclides with up to 8 alpha lines for each nuclide. Any one of 32 subset libraries can be used in an analysis. Analysis time is short and is limited by interaction with the operator, not by calculation time. Utilities include nuclide library editing, library subset editing, energy calibration, efficiency calibration, and background update. RP CHAPMAN, TC (reprint author), WESTINGHOUSE IDAHO NUCL CO INC,IDAHO NATL ENGN LAB,MS-2202,POB 4000,IDAHO FALLS,ID 83403, USA. NR 4 TC 0 Z9 0 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 958 EP 961 DI 10.1109/23.159740 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300088 ER PT J AU FALTER, KG BAUER, ML AF FALTER, KG BAUER, ML TI TRITIUM MONITORING-SYSTEM FOR NEAR AMBIENT MEASUREMENTS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB This paper describes the current status of research on an improved tritium measurement system at the Oak Ridge National Laboratory (ORNL) for the U.S. Navy. Present tritium-in-air monitoring systems installed by the Navy can reliably measure to less than 10 muCi/m3, but medical and safety issues are pushing measurement needs to below 1 muCi/m3, which is equivalent to 1-10 nCi/ml in liquid samples, using calcium metal converter. A significant effort has been expended over the past 10 years by the Navy RADIAC Development Program at ORNL on various schemes to improve the detection of tritium in both air and liquid at near ambient levels. One such scheme includes a liquid flow-through system based on an NE102 sponge scintillator with dual photomultiplier tubes for tube noise rejection. RP FALTER, KG (reprint author), OAK RIDGE NATL LAB,DIV INSTRUMENTAT & CONTROLS,POB 2008,OAK RIDGE,TN 37831, USA. NR 3 TC 3 Z9 3 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 962 EP 965 DI 10.1109/23.159741 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300089 ER PT J AU HUBBARD, GS MCMURRAY, RE KELLER, RG WERCINSKI, PF WALTON, JT VIERINEN, K AF HUBBARD, GS MCMURRAY, RE KELLER, RG WERCINSKI, PF WALTON, JT VIERINEN, K TI RESULTS FROM A SI(LI) GAMMA-RAY DETECTOR STACK FOR FUTURE MARS MISSIONS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB We present Monte Carlo analysis and experimental data from a novel lithium-drifted silicon detector stack for gamma ray spectroscopy instrumentation in future Mars surface landers and other planetary missions. The Monte Carlo analysis shows full energy photopeaks even in the range of approximately 100 keV to 2 MeV where, in Si, Compton scattering dominates the absorption processes. Laboratory data is shown for an experimental detector stack of 4 planar Si(Li) devices, each 5 mm thick with an active area 2 cm in diameter. All the experimental data were collected with maximum temperature of the stack at 175 K. Background reduction is achieved by using the detector of the stack closest to the source in anticoincidence. We present a comparison of experimental data from the stack with the Monte Carlo model for CS-137 (662 keV). Agreement is shown to be good, with a full energy photopeak clearly seen (FWHM approximately 10 keV). Experimental stack data is also shown for multiple peaks at 511 keV (Na-22) and 662 keV (CS-137). The peaks are Clearly resolved (FWHM approximately 10 keV), and are compared with the results obtained using a 8% resolution, 3 in. x 3 in. NaI(TI) device (FWHM approximately 50 keV). C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV HELSINKI,SF-00170 HELSINKI 17,FINLAND. RP HUBBARD, GS (reprint author), NASA,AMES RES CTR,MOFFETT FIELD,CA 94035, USA. NR 15 TC 3 Z9 3 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 981 EP 986 DI 10.1109/23.159745 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300093 ER PT J AU HALBLEIB, JA KENSEK, RP VALDEZ, GD AF HALBLEIB, JA KENSEK, RP VALDEZ, GD TI ITS - THE INTEGRATED TIGER SERIES OF ELECTRON PHOTON TRANSPORT CODES - VERSION 3.0 SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE ID ORBITAL ELECTRONS; CROSS-SECTIONS; BREMSSTRAHLUNG; SPECTRA; NUCLEI AB The ITS system is a powerful and user-friendly software package permitting state-of-the-art Monte Carlo solution of linear time-independent coupled electron/photon radiation transport problems, with or without the presence of macroscopic electric and magnetic fields of arbitrary spatial dependence. Version 3.0 is a major upgrade of the system with important improvements in the physical model, variance reduction, I/O, and user friendliness. Improvements to the cross-section generator include the replacement of Born-approximation bremsstrahlung cross sections with the results of numerical phase-shift calculations, the addition of coherent scattering and binding effects in incoherent scattering, an upgrade of collisional and radiative stopping powers, and a complete rewrite to Fortran 77 standards emphasizing Block-IF structure, Improvements in the Monte Carlo codes include significant variance reduction from reorganized logic for electron trapping and Russian Roulette, angular dependent output of particle fluxes, explicit line radiation in flux and escape outputs, an option for photon transport only, more accurate sampling of collision loss straggling, extended implementation of full automatic subzoning, increased error checking, and extensive improvements in code clarity and maintainability. C1 APPL METHODS INC,ALBUQUERQUE,NM 87110. RP HALBLEIB, JA (reprint author), SANDIA NATL LABS,DIV SIMULAT TECHNOL RES 9341,ALBUQUERQUE,NM 87185, USA. NR 23 TC 156 Z9 159 U1 1 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 1025 EP 1030 DI 10.1109/23.159753 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300101 ER PT J AU LORENCE, LJ AF LORENCE, LJ TI CEPXS ONELD VERSION 2.0 - A DISCRETE ORDINATES CODE PACKAGE FOR GENERAL ONE-DIMENSIONAL COUPLED ELECTRON-PHOTON TRANSPORT SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB CEPXS/ONELD is a discrete ordinates code capable of modelling the fully-coupled electron-photon cascade at high energies. Quantities such as dose and charge deposition can readily be obtained. This deterministic code is much faster than comparable Monte Carlo codes. The unique adjoint transport capability of CEPXS/ONELD also enables response functions to be readily calculated. Version 2.0 of the CEPXS/ONELD code package has been designed to allow users who are not expert in discrete ordinates methods to fully exploit the code's capabilities. RP LORENCE, LJ (reprint author), SANDIA NATL LABS,SIMULAT TECHNOL RES DEPT,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 12 TC 37 Z9 37 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 1031 EP 1034 DI 10.1109/23.159754 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300102 ER PT J AU HENDRICKS, JS BRIESMEISTER, JF AF HENDRICKS, JS BRIESMEISTER, JF TI RECENT MCNP DEVELOPMENTS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE ID CARLO AB We report here both the status and recent developments in the MCNP Monte Carlo radiation transport computer code and two items of more general interest to computational physics: the accuracy of modern physics computer codes and the performance of scientific workstations. RP HENDRICKS, JS (reprint author), LOS ALAMOS NATL LAB,DIV APPL THEORET PHYS,LOS ALAMOS,NM 87545, USA. NR 21 TC 7 Z9 7 U1 2 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 1035 EP 1040 DI 10.1109/23.159755 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300103 ER PT J AU RHODES, E DICKERMAN, CE DEVOLPI, A PETERS, CW AF RHODES, E DICKERMAN, CE DEVOLPI, A PETERS, CW TI APSTNG - RADIATION INTERROGATION FOR VERIFICATION OF CHEMICAL AND NUCLEAR-WEAPONS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE ID NEUTRON AB A recently developed neutron diagnostic probe system as the potential to satisfy a significant number of van-mobile and fixed-portal requirements for nondestructive verification of sealed munitions. The probe is based on a unique associated-particle sealed-tube neutron generator (APSTNG) that interrogates a TLI (treaty-limited item) with a low-intensity beam of 14-MeV neutrons generated from the deuterium-tritium reaction and that detects the alpha-particle associated with each neutron. Gamma-ray spectra of resulting neutron inelastic scattering and fission reactions identify nuclides associated with all major chemicals in chemical warfare agents, explosives, and drugs, as well as many pollutants and fissile and fertile special nuclear material. Flight times determined from detection times of the gamma-rays and alpha-particles yield a separate tomographic image of each nuclide. The APSTNG also forms the basis for a compact fast-neutron transmission imaging system that can be used along with or instead of the emission imaging system. The small and relatively inexpensive APSTNG exhibits high reliability and can be quickly replaced. Proof-of-concept experiments have been performed under laboratory conditions for simulated nuclear, high-explosive, and chemical warfare munitions. C1 NUCL DIAGNOST SYST,SPRINGFIELD,VA 22150. RP RHODES, E (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 4 TC 10 Z9 11 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 1041 EP 1045 DI 10.1109/23.159756 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300104 ER PT J AU ZIOCK, KP HAILEY, CJ GOSNELL, TB LUPTON, JH HARRISON, FA AF ZIOCK, KP HAILEY, CJ GOSNELL, TB LUPTON, JH HARRISON, FA TI A GAMMA-RAY IMAGER FOR ARMS-CONTROL SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE ID ARRAYS AB Ascertaining the number of warheads on a missile-delivery system by a remote, non-visual inspection may be desirable in some arms-control verification scenarios. We have developed a Gamma-Ray Imaging System (GRIS) to inspect for nuclear warheads by imaging the highly penetrating gamma-radiation emitted by radioactive materials integral to warheads. Such an image may be used to obtain the compliment of warheads aboard the missile. We describe the GRIS operating principles and capabilities, present data, and discuss the advantages and disadvantages of such a system for arms control. We also present field results where GRIS was used on an emplaced Peacekeeper missile. Finally, improvements to GRIS in light of the field trial results are presented. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP ZIOCK, KP (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 5 TC 17 Z9 18 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 1046 EP 1050 DI 10.1109/23.159757 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300105 ER PT J AU BYRD, RC AUCHAMPAUGH, GF MOSS, CE FELDMAN, WC AF BYRD, RC AUCHAMPAUGH, GF MOSS, CE FELDMAN, WC TI WARHEAD COUNTING USING NEUTRON SCINTILLATORS - DETECTOR DEVELOPMENT, TESTING, AND DEMONSTRATION SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB Although the number of warheads on a missile can be determined relatively simply by a scan of the emitted gamma radiation, this approach may be considered too intrusive because of the possibility that high-resolution energy or position measurements may reveal warhead design information. information. Neutron spectra are nearly featureless, and obtaining the position resolution needed to reveal warhead details would be very difficult. We describe the development of a fast-neutron detector based on a boron-loaded plastic scintillator used previously for space applications. The detector rejects gammas and scattered low-energy neutrons, and its segmentation allows narrow fan-shaped collimation within +/- 20-degrees horizontally and +/- 50-degrees vertically. Testing includes distinguishing between mockups with either two or three warheads and locating the ten warheads on a silo-based Peacekeeper missile. RP BYRD, RC (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 3 TC 7 Z9 7 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 1051 EP 1055 DI 10.1109/23.159758 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300106 ER PT J AU FATHIZADEH, M DESPE, OD MCGHEE, DG MILLS, FE TURNER, LR AF FATHIZADEH, M DESPE, OD MCGHEE, DG MILLS, FE TURNER, LR TI A HIGH-CURRENT, HIGH-VOLTAGE POWER-SUPPLY WITH SPECIAL OUTPUT CURRENT WAVE-FORM FOR APS INJECTOR SYNCHROTRON DIPOLE MAGNETS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF CY OCT 02-09, 1991 CL SANTA FE, NM SP IEEE AB This paper describes a high-voltage, high-current power supply for the injector synchrotron dipole magnets at APS. In order to reset the dipole magnets in each cycle two different current waveforms am suggested. The first current waveform consists of three sections, namely: dc-reset, linear ramp, and recovery sections where injection is done "on the fly". The second current waveform consists of six different sectiOns, dc-reset, transition to injection level, injection flat level, parabolic, linear ramp and recovery sections. The effect of such waveforms on the beam is discussed and the power supply limitations to follow such waveforms are given. The power supply limitations are due to the power components and control loops. The reference for the current loop is generated by a DAC which is discussed. RP FATHIZADEH, M (reprint author), ARGONNE NATL LAB,APS,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD AUG PY 1992 VL 39 IS 4 BP 1175 EP 1179 DI 10.1109/23.159779 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JR353 UT WOS:A1992JR35300127 ER PT J AU ANDERS, A ANDERS, S JUTTNER, B BOTTICHER, W LUCK, H SCHRODER, G AF ANDERS, A ANDERS, S JUTTNER, B BOTTICHER, W LUCK, H SCHRODER, G TI PULSED DYE-LASER DIAGNOSTICS OF VACUUM-ARC CATHODE SPOTS SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID CURRENT-DENSITY; PLASMA; REGION AB The ignition and arc phases of vacuum arcs were investigated using differential dye laser absorption photography with simultaneous high spatial (micrometer) and temporal (nanosecond) resolution. The discharge duration was 800 ns, the current 50-150 A, the electrode material copper, and the cathode-anode distance less than 50-mu-m. A 0.4 ns laser pulse (tunable, lambda = 480-530 nm) was used to obtain momentary absorption photographs of the cathode region. During ignition, an optically thick anode plasma expanded toward the cathode, decaying within 25 ns after bridging the electrode gap. In the arc phase, a fragmentary structure of the cathode spots was observed in situ for the first time. The microspots have a characteristic size of 5-10-mu-m. They appear and disappear on a nanosecond time scale. The plasma density of the microspots was estimated to be greater than (3-6) X 10(26) m-3 . The results are in agreement with the model of explosive electron emission. A current density in the cathode spots as high as 10(12) A/m2 can be deduced. C1 ZENT INST ELEKTRONENPHYS,O-1086 BERLIN,GERMANY. UNIV HANNOVER,INST PLASMA PHYS,W-3000 HANNOVER 1,GERMANY. RP ANDERS, A (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Lueck, Harald/F-7100-2011; Anders, Andre/B-8580-2009; Raoux, Simone/G-3920-2016 OI Lueck, Harald/0000-0001-9350-4846; Anders, Andre/0000-0002-5313-6505; NR 34 TC 101 Z9 103 U1 0 U2 6 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD AUG PY 1992 VL 20 IS 4 BP 466 EP 472 DI 10.1109/27.256775 PG 7 WC Physics, Fluids & Plasmas SC Physics GA JH870 UT WOS:A1992JH87000011 ER PT J AU ADIBI, MM CLEMENTS, KA KAFKA, RJ STOVALL, JP BORKOSKI, JN BRITTAIN, LE DZWONCZYK, JG KEAGLE, WA KIPP, JM THOMAS, KR WOLLENBERG, BF AF ADIBI, MM CLEMENTS, KA KAFKA, RJ STOVALL, JP BORKOSKI, JN BRITTAIN, LE DZWONCZYK, JG KEAGLE, WA KIPP, JM THOMAS, KR WOLLENBERG, BF TI INTEGRATION OF REMOTE MEASUREMENT CALIBRATION WITH STATE ESTIMATION - A FEASIBILITY STUDY SO IEEE TRANSACTIONS ON POWER SYSTEMS LA English DT Article DE MEASUREMENT CALIBRATION; STATE ESTIMATION; RESIDUALS; REAL-TIME DATABASE AB This paper describes the integration of measurement calibration and state estimation methodologies for increasing the confidence level in the real-time data base. The objectives are to improve performance of state estimators and to reduce the system engineering effort which goes into its installations and the related measurement calibrations., These objectives are accomplished by remotely minimizing the systematic errors and providing the state estimator with zero-mean and the actual standard deviation for each measurement. The state estimator is then able to suppress the spurious errors and furnish dependable real-time data base for the computer control of power systems. The approach is supported by experimental results carried on a 55 bus portion of an actual power system. C1 POTOMAC ELECT POWER CO,WASHINGTON,DC. OAK RIDGE NATL LAB,OAK RIDGE,TN. WORCESTER POLYTECH INST,ELECT ENGN,WORCESTER,MA 01609. UNIV MINNESOTA,MINNEAPOLIS,MN 55455. RP ADIBI, MM (reprint author), IRD CORP,BETHESDA,MD, USA. NR 9 TC 5 Z9 5 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0885-8950 J9 IEEE T POWER SYST JI IEEE Trans. Power Syst. PD AUG PY 1992 VL 7 IS 3 BP 1164 EP 1172 DI 10.1109/59.207330 PG 9 WC Engineering, Electrical & Electronic SC Engineering GA JC574 UT WOS:A1992JC57400024 ER PT J AU BUSCH, JF AF BUSCH, JF TI DETERMINING THE VALUE OF CONSERVATION TO THAILAND ELECTRIC UTILITY SO IEEE TRANSACTIONS ON POWER SYSTEMS LA English DT Article DE LOAD MANAGEMENT; GENERATION PLANNING; CAPACITY DEFERRAL ID POWER SECTOR INNOVATION; DEVELOPING-COUNTRIES AB Incorporating demand-side resources into the planning regime of fast-growing electric utilities in developing countries is a particular challenge. A method is developed for valuing the contribution of conservation under these circumstances and illustrated through scenarios of electricity savings in Thailand's large commercial sector. The primary value of these scenarios is in the creation of opportunities to defer or cancel plants planned for future inclusion in the system. The benefits of such deferments are twofold: a direct reduction in capacity needs commensurate with the load impacts of the scenario, plus a reduction in the reserve margin required to maintain system reliability. Comparison of the capital requirements of the conservation scenarios versus the deferrable plant capacity showed that conservation is substantially less capital intensive. RP BUSCH, JF (reprint author), LAWRENCE BERKELEY LAB,ENERGY ANAL PROGRAM,BERKELEY,CA 94720, USA. NR 20 TC 1 Z9 1 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0885-8950 J9 IEEE T POWER SYST JI IEEE Trans. Power Syst. PD AUG PY 1992 VL 7 IS 3 BP 1218 EP 1224 DI 10.1109/59.207336 PG 7 WC Engineering, Electrical & Electronic SC Engineering GA JC574 UT WOS:A1992JC57400030 ER PT J AU KAHN, EP MARNAY, C BERMAN, D AF KAHN, EP MARNAY, C BERMAN, D TI EVALUATING DISPATCHABILITY FEATURES IN COMPETITIVE BIDDING SO IEEE TRANSACTIONS ON POWER SYSTEMS LA English DT Article DE COMPETITIVE BIDDING; DISPATCHABILITY; PRODUCTION SIMULATION MODELS AB Competitive bidding for electric generating capacity is beginning to emphasize dispatchability. This paper examines various aspects of the evaluation problem facing utilities. Recent private power contracts are used to illustrate the range and limits upon flexibility that are being offered. Only detailed production simulation models can capture the cost implications of the features being offered. The value of dispatchability is found to increase with the variable cost of operation. The most important cost found is associated with projects offering only limited curtailment. Procedures for incorporating subtle dispatch effects in a broader evaluation framework are identified. RP KAHN, EP (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 11 TC 9 Z9 9 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0885-8950 J9 IEEE T POWER SYST JI IEEE Trans. Power Syst. PD AUG PY 1992 VL 7 IS 3 BP 1259 EP 1265 PG 7 WC Engineering, Electrical & Electronic SC Engineering GA JC574 UT WOS:A1992JC57400036 ER PT J AU RAO, NSV WU, WC GLOVER, CW AF RAO, NSV WU, WC GLOVER, CW TI ALGORITHMS FOR RECOGNIZING PLANAR POLYGONAL CONFIGURATIONS USING PERSPECTIVE IMAGES SO IEEE TRANSACTIONS ON ROBOTICS AND AUTOMATION LA English DT Note DE ALGORITHMS; COMPLEXITY; PERSPECTIVE PROJECTION ID SIMILARITY; SETS AB We consider a simplified abstraction of the problem of recognizing planar arrangements of objects using camera pictures taken from unknown positions. A set of polygons in plane is called a planar polygonal configuration. Given perspective images P and Q corresponding to planar polygonal configurations, the matching problem is to determine if P and Q correspond to the same configuration. We present an optimal theta(n log n) time algorithm to solve this problem, where n, is the total number of vertices of polygons in each image. Our algorithm is obtained by combining the ideas of cross ratios, which are well known to be invariant under perspective projections, and the first fundamental theorem of perspective projections. This algorithm has been implemented and tested. C1 OAK RIDGE NATL LAB,CTR ENGN SYST ADV RES,OAK RIDGE,TN 37831. RP RAO, NSV (reprint author), OLD DOMINION UNIV,DEPT COMP SCI,NORFOLK,VA 23529, USA. OI Rao, Nageswara/0000-0002-3408-5941 NR 21 TC 13 Z9 13 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1042-296X J9 IEEE T ROBOTIC AUTOM JI IEEE Trans. Robot. Autom. PD AUG PY 1992 VL 8 IS 4 BP 480 EP 486 DI 10.1109/70.149946 PG 7 WC Automation & Control Systems; Engineering, Electrical & Electronic; Robotics SC Automation & Control Systems; Engineering; Robotics GA JH230 UT WOS:A1992JH23000006 ER PT J AU NOVOA, JJ WHANGBO, MH WILLIAMS, JM AF NOVOA, JJ WHANGBO, MH WILLIAMS, JM TI ON THE STRUCTURES, STABILITIES AND FRAGMENTATION PATTERNS OF CARBON CLUSTERS INCLUDING BUCKMINSTERFULLERENE SO INORGANICA CHIMICA ACTA LA English DT Article ID SUPERCONDUCTIVITY; C-60; PHASE; RBXC60; IONS; C60 AB The heats of formation and optimum structures of various neutral C(n) clusters (n less-than-or-equal-to approximately 60) and linear C(n)+ cations (n less-than-or-equal-to 40) were determined by quantum chemical calculations. Buckminsterfullerene is thermodynamically more stable than the next stable form of C60 by about 600 kcal/mol. C60 and C70 fullerenes belong to a series of fullerenes C-10m+40 (m greater-than-or-equal-to 2) that are derived from C-10m cylinders and C20 capping units. In the fragmentation of C(n) and C(n)+ clusters, the preference for the C2 or C3 loss is predicted to depend upon whether the clusters have structures with mainly two- or three-coordinate carbon atoms. C1 N CAROLINA STATE UNIV, DEPT CHEM, RALEIGH, NC 27695 USA. ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. RI Novoa, Juan/B-3525-2013 OI Novoa, Juan/0000-0003-3577-1182 NR 23 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0020-1693 J9 INORG CHIM ACTA JI Inorg. Chim. Acta PD AUG-OCT PY 1992 VL 198 BP 133 EP 138 DI 10.1016/S0020-1693(00)92353-3 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA JK243 UT WOS:A1992JK24300013 ER PT J AU RAO, KM ANGELICI, RJ YOUNG, VG AF RAO, KM ANGELICI, RJ YOUNG, VG TI THE 1,3-DIMETALLOALLYL TRI-RUTHENIUM CLUSTER (MU-H)RU3(MU-3-ETA-3-CHCHCME)(CO)9 AND ITS PPH3 DERIVATIVES SO INORGANICA CHIMICA ACTA LA English DT Article ID TROPSCH CHAIN GROWTH; R = ME; TRIRUTHENIUM CLUSTERS; SUPPORTED RU; C-13 NMR; ETHYLENE; RU3(CO)12; COMPLEXES; MODEL; PH AB Reactions of RU3(CO)12 with 1,3-butadiene or cis-2-butene give the mu-3-eta-3-dimetalloallyl compound (mu-H)RU3(mu-3-eta-3-CHCHCMe)(CO)9 (2). Refluxing 2 with PPh3 gives the CO-substituted products (mu-H)RU3(mu-3-eta-3-CHCHCMe)(CO)8(PPh3) (3) and (mu-H)RU3(mu-3-eta-3-CHCHCMe)(CO)7(PPh3)2 (4). Single crystal X-ray diffraction studies of 2, 3 and 4 show that all have the dimetalloallyl unit. These investigations demonstrate that this unit is remarkably stable and might be expected to form on triangular arrays of metal atoms on metal surfaces. C1 IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, MOLEC STRUCT LAB, AMES, IA 50011 USA. NR 30 TC 20 Z9 20 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0020-1693 J9 INORG CHIM ACTA JI Inorg. Chim. Acta PD AUG-OCT PY 1992 VL 198 BP 211 EP 217 DI 10.1016/S0020-1693(00)92363-6 PG 7 WC Chemistry, Inorganic & Nuclear SC Chemistry GA JK243 UT WOS:A1992JK24300023 ER PT J AU STORMONT, JC DAEMEN, JJK DESAI, CS AF STORMONT, JC DAEMEN, JJK DESAI, CS TI PREDICTION OF DILATION AND PERMEABILITY CHANGES IN ROCK SALT SO INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS LA English DT Article ID GEOLOGIC MATERIALS; MODEL; PLASTICITY; SOILS AB A numerical procedure has been developed for predicting dilation (porosity) and gas permeability changes in rock salt. The hierarchical single-surface constitutive model of Desai and co-workers is used a finite element program to calculate the state of stress and strain surrounding excavations in rock salt. The elastoplastic constitutive model accounts for strain hardening, a non-associative volumetric response and stress-path-dependent behaviour. The calculated stress and strain fields are used in a flow model based on the equivalent channel concept to predict permeability. Parameters for both the mechanical and permeability models are developed from laboratory test results. Two field experiments adjacent to underground excavations are modelled. The extent of the dilated rock zone around the excavation is predicted well, but the magnitude of the porosity and gas permeability is underpredicted very near the excavations. This discrepancy is attributed to model parameters derived from loading-only laboratory tests, whereas significant unloading occurs in the field. The shape of the yield surface was found to be an important factor in dilation and permeability predictions. Similar stress, strain and permeability fields were obtained with different model types (plane strain or axisymmetric) and initial stress states, and with instantaneous and progressive excavation. C1 UNIV NEVADA,MACKAY SCH MINES,RENO,NV 89557. UNIV ARIZONA,DEPT CIVIL ENGN & ENGN MECH,TUCSON,AZ 85721. RP STORMONT, JC (reprint author), SANDIA NATL LABS,DIV ENVIRONM TECHNOL,ALBUQUERQUE,NM 87185, USA. NR 30 TC 6 Z9 8 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0363-9061 J9 INT J NUMER ANAL MET JI Int. J. Numer. Anal. Methods Geomech. PD AUG PY 1992 VL 16 IS 8 BP 545 EP 569 DI 10.1002/nag.1610160802 PG 25 WC Engineering, Geological; Materials Science, Multidisciplinary; Mechanics SC Engineering; Materials Science; Mechanics GA JJ040 UT WOS:A1992JJ04000001 ER PT J AU MARTINEZ, MJ MCTIGUE, DF AF MARTINEZ, MJ MCTIGUE, DF TI A BOUNDARY INTEGRAL METHOD FOR STEADY FLOW IN UNSATURATED POROUS-MEDIA SO INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS LA English DT Article ID HYDRAULIC CONDUCTIVITY; EXCLUSION PROBLEM; CAVITIES; INFILTRATION; SEEPAGE AB The governing equation for steady flow in a homogeneous, partially saturated, porous medium can be written in a linear form if one adopts a hydraulic conductivity function which varies exponentially with capillary-pressure head. The resulting linear field equation is a steady Fokker-Planck equation and is well-suited to numerical solution by the boundary integral equation method (BIEM). The exponential conductivity function is often used in soil physics and is known to be a reasonable approximation over limited ranges of pressure head. A computer code based on the BIEM for obtaining numerical solutions is described and tested. The BIEM is found to exhibit quadratic convergence with element size reduction on smooth solutions and on singular problems, if mesh grading is used. Agreement between results from the BIEM code and a finite element code that solves the fully non-linear problem is excellent, and is achieved at a substantial advantage in computer processing time. As an illustrative example, the code is applied to determine the distribution of moisture in the vicinity of a tunnel. RP MARTINEZ, MJ (reprint author), SANDIA NATL LABS,DIV COMPUTAT FLUID DYNAM,ALBUQUERQUE,NM 87185, USA. NR 29 TC 7 Z9 7 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0363-9061 J9 INT J NUMER ANAL MET JI Int. J. Numer. Anal. Methods Geomech. PD AUG PY 1992 VL 16 IS 8 BP 581 EP 601 DI 10.1002/nag.1610160804 PG 21 WC Engineering, Geological; Materials Science, Multidisciplinary; Mechanics SC Engineering; Materials Science; Mechanics GA JJ040 UT WOS:A1992JJ04000003 ER PT J AU ITO, T SAITO, M KOBAYASHI, K AF ITO, T SAITO, M KOBAYASHI, K TI DISSOCIATION OF A MODEL DNA COMPOUND DAPDA BY MONOCHROMATIC SOFT X-RAYS IN SOLIDS AND COMMENTS ON THE HIGH SELECTIVITY FOR 3' BREAKAGE IN THE PHOSPHOESTER BOND SO INTERNATIONAL JOURNAL OF RADIATION BIOLOGY LA English DT Article ID RADIATION-CHEMISTRY; PHOSPHATE RELEASE; OLIGONUCLEOTIDES; MONOPHOSPHATES; INACTIVATION; IRRADIATION; REGION AB The dissociation products of dApdA (2'-deoxyadenylyl-(3'-5')-2'-deoxyadenosine) irradiated in the solid state by highly monochromatic soft X-rays (energy resolution, < 10(-3)) near the K-edge of phosphorus were analysed using thin-layer chromatography. The major chemical species identified were adenine base and 5'-dAMP in approximately equal amounts, indicating that the dissociation occurred between the 3' carbon (C3') of deoxypentose and its adjacent phosphorus over the energy range of 2.147-2.167 keV, including the K-edge resonance absorption of phosphorus at 2.153 keV. In conjunction with the accumulated data on the degradation of dApdA and related oligonucleotides by vacuum-UV radiation (above 7 eV), which generally indicate a simple, selective dissociation at the 3' side of the deoxypentose as observed with the soft X-rays, an hypothesis is presented on the molecular mechanism of radiation-induced breakage of phosphoester bonds that led to the selective 3' breakage, based on the differential flexibility of torsion angles of C3'-O3'-P and C4'-C5'-O5'-P groups in relation to those of the sugar ring. C1 RIKKYO UNIV,BIOPHYS LAB,TOSHIMA KU,TOKYO 171,JAPAN. NATL LAB HIGH ENERGY PHYS,PHOTON FACTORY,TSUKUBA,IBARAKI 305,JAPAN. ARGONNE NATL LAB,DIV BIOL & MED RES,ARGONNE,IL 60439. NR 25 TC 12 Z9 12 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0955-3002 J9 INT J RADIAT BIOL JI Int. J. Radiat. Biol. PD AUG PY 1992 VL 62 IS 2 BP 129 EP 136 DI 10.1080/09553009214551931 PG 8 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 JL581 UT WOS:A1992JL58100001 PM 1355505 ER PT J AU MATTAS, RF LOOMIS, BA SMITH, DL AF MATTAS, RF LOOMIS, BA SMITH, DL TI VANADIUM ALLOYS FOR FUSION-REACTOR APPLICATIONS SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Article AB Fusion reactors will produce a severe operating environment for structural materials. The material should have good mechanical strength and ductility to high temperature, be corrosion resistant to the local environment, have attractive thermophysical properties to accommodate high heat loads, and be resistant to neutron damage. Vanadium alloys are being developed for such applications, and they exhibit desirable properties in many areas. Recent progress in vanadium alloy development indicates good strength and ductility to 700-degrees-C, minimal degradation by neutron irradiation, and reduced radioactivity compared with other candidate alloy systems. RP MATTAS, RF (reprint author), ARGONNE NATL LAB,FUS POWER PROGRAM,ARGONNE,IL 60439, USA. NR 14 TC 7 Z9 7 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD AUG PY 1992 VL 44 IS 8 BP 26 EP 29 PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA JJ595 UT WOS:A1992JJ59500009 ER PT J AU ICE, GE SPECHT, ED LAGGIS, S AF ICE, GE SPECHT, ED LAGGIS, S TI MOSAIC LIH MONOCHROMATORS FOR LOW-ENERGY X-RAYS SO JOURNAL OF APPLIED CRYSTALLOGRAPHY LA English DT Article ID RESONANCE EXCHANGE SCATTERING AB Mosaic LiH is evaluated for use as an X-ray monochromator. The theoretical performance of mosaic LiH is compared to that of LiF, graphite and other mosaic crystals. Calculations are made for Cu K-alpha radiation (8.04 keV) and at the U M(IV) edge (3.728 keV). For large single crystals of LiH and LiF, experimental measurements at 8.04 keV are reported for the integrated reflectivity, mosaic spread and strain/particle-size-limited resolution. Although the LiH crystal had a nonuniform mosaic spread and was partially transparent to the 8.04 keV incident X-rays, the integrated reflectivity exceeded by 25% that of a mosaic LiF crystal measured under identical conditions. Longitudinal theta-2-theta scans through the LiH(200) reflection showed that the peak width is less than that of a perfect Si(220) crystal. The X-ray properties of mosaic LiH are extrapolated to low X-ray energies; in this regime the small photoelectric absorption coefficient makes LiH even more attractive as an X-ray monochromator crystal. C1 OAK RIDGE Y-12 PLANT,DIV DEV,OAK RIDGE,TN 37831. RP ICE, GE (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. RI Specht, Eliot/A-5654-2009 OI Specht, Eliot/0000-0002-3191-2163 NR 19 TC 1 Z9 1 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0021-8898 J9 J APPL CRYSTALLOGR JI J. Appl. Crystallogr. PD AUG 1 PY 1992 VL 25 BP 488 EP 494 DI 10.1107/S0021889892001419 PN 4 PG 7 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA JH630 UT WOS:A1992JH63000004 ER PT J AU WENK, HR AF WENK, HR TI ADVANTAGES OF MONOCHROMATIC X-RAYS FOR TEXTURE DETERMINATION OF SUPERCONDUCTING THIN-FILMS SO JOURNAL OF APPLIED CRYSTALLOGRAPHY LA English DT Article AB X-ray pole-figure measurements traditionally employ beta-filtered radiation. The remaining continuous spectrum can introduce serious artifacts in strong textures. It is shown that spurious peaks form in textures of epitactic YBCO films and that background determination may be ambiguous. These difficulties can be avoided by using monochromatic radiation with a graphite monochromator between the X-ray tube and the specimen. C1 LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP WENK, HR (reprint author), UNIV CALIF BERKELEY,DEPT GEOL & GEOPHYS,BERKELEY,CA 94720, USA. NR 9 TC 8 Z9 8 U1 1 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0021-8898 J9 J APPL CRYSTALLOGR JI J. Appl. Crystallogr. PD AUG 1 PY 1992 VL 25 BP 524 EP 530 DI 10.1107/S0021889892003182 PN 4 PG 7 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA JH630 UT WOS:A1992JH63000009 ER PT J AU WANG, XJ TSANG, T KIRK, H SRINIVASANRAO, T FISCHER, J BATCHELOR, K RUSSELL, P FERNOW, RC AF WANG, XJ TSANG, T KIRK, H SRINIVASANRAO, T FISCHER, J BATCHELOR, K RUSSELL, P FERNOW, RC TI INTENSE ELECTRON-EMISSION DUE TO PICOSECOND LASER-PRODUCED PLASMAS IN HIGH-GRADIENT ELECTRIC-FIELDS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID VACUUM; PULSES AB Picosecond laser pulses at a wavelength of 266 nm have been focused onto a solid metal cathode in coincidence with high gradient electric fields to produce high brightness electron beams. At power densities exceeding 10(9) W/cm2, a solid density plasma is formed and intense bursts of electrons are emitted from the target accompanied by macroscopic surface damage. An inferred approximately 1-mu-C of integrated charge with an average current of approximately 20 A is emitted from a radio-frequency cavity driven at electric field gradients of approximately 80 MV/m. In another experiment, where a dc extraction field of approximately 6 MV/m is used, we observed an electron charge of approximately 0.17-mu-C. Both results are compared with the Schottky effect and the Fowler-Nordheim field emission. We found that this laser-induced intense electron emission shares many features with the explosive electron emission processes. No selective wavelength dependence is observed in the production of the intense electron emission in the dc extraction field. The integrated electrons give an apparent quantum efficiency of approximately 1.2%, which is one of the highest reported to date from metal photocathodes at these photon energies. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 19 TC 22 Z9 22 U1 1 U2 9 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 AUG 1 PY 1992 VL 72 IS 3 BP 888 EP 894 DI 10.1063/1.351763 PG 7 WC Physics, Applied SC Physics GA JF868 UT WOS:A1992JF86800010 ER PT J AU NELSON, AJ NILES, DW KAZMERSKI, LL RIOUX, D PATEL, R HOCHST, H AF NELSON, AJ NILES, DW KAZMERSKI, LL RIOUX, D PATEL, R HOCHST, H TI PHOTOEMISSION-STUDY ON THE FORMATION OF MO CONTACTS TO CUINSE2 SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ELECTRONIC-STRUCTURE; SINGLE-CRYSTALS; METAL CONTACTS; SOLAR-CELLS; INTERFACE; SURFACES; DIPOLES; CUGASE2 AB Synchrotron radiation soft-x-ray photoemission spectroscopy was used to investigate the development of the electronic structure at the Mo/CuInSe2 interface. Mo overlayers were e-beam deposited in steps on single-crystal n-type CuInSe2 at ambient temperature. Photoemission measurements were acquired after each growth in order to observe changes in the valence-band electronic structure as well as changes in the In 4d, Se 3d, and Mo 4d core lines. Photoemission measurements on the valence-band and core lines were also obtained after annealing. The results were used to correlate the interface chemistry with the electronic structure at this interface and to directly determine the maximum possible Schottky barrier height phi(b) to be less-than-or-equal-to 0.2 eV at the Mo/CuInSe2 junction before annealing, thus showing that this contact is essentially ohmic. C1 UNIV WISCONSIN,CTR SYNCHROTRON RADIAT,STOUGHTON,WI 53589. RP NELSON, AJ (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 27 TC 8 Z9 8 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD AUG 1 PY 1992 VL 72 IS 3 BP 976 EP 980 DI 10.1063/1.351775 PG 5 WC Physics, Applied SC Physics GA JF868 UT WOS:A1992JF86800023 ER PT J AU RILEY, DA ELLIS, S GIOMETTI, CS HOH, JFY ILYINAKAKUEVA, EI OGANOV, VS SLOCUM, GR BAIN, JLW SEDLAK, FR AF RILEY, DA ELLIS, S GIOMETTI, CS HOH, JFY ILYINAKAKUEVA, EI OGANOV, VS SLOCUM, GR BAIN, JLW SEDLAK, FR TI MUSCLE SARCOMERE LESIONS AND THROMBOSIS AFTER SPACEFLIGHT AND SUSPENSION UNLOADING SO JOURNAL OF APPLIED PHYSIOLOGY LA English DT Article DE FIBER TYPES; HISTOCHEMISTRY; ELECTRON MICROSCOPY; IMMUNOHISTOCHEMISTRY; ATROPHY; MITOCHONDRIA; MYOSIN; SKELETAL MUSCLE; RAT ID HINDLIMB SUSPENSION; SKELETAL-MUSCLES; SOLEUS MUSCLE; SPACE-FLIGHT; RAT SOLEUS; EXERCISE; ULTRASTRUCTURE; IMMOBILIZATION; CONTRACTIONS; INJURY AB Spaceflight (flight) and tail suspension-hindlimb unloading (unloaded) produced significant decreases in fiber cross-sectional areas of the adductor longus (AL), a slow-twitch antigravity muscle. However, the mean wet weight of the flight AL muscles was near normal, whereas that of the suspension unloaded AL muscles was significantly reduced. Interstitial edema within the flight AL, but not in the unloaded AL, appeared to account for this apparent disagreement. In both experimental conditions, the slow-twitch oxidative fibers atrophied more than the fast-twitch oxidative-glycolytic and fast-twitch glycolytic fibers. Immunostaining showed that slow-twitch oxidative fibers expressed fast myosin, producing hybrid fibers containing slow and fast myosin isoforms. Two-dimensional gel electrophoresis of flight AL muscles revealed increased content of fast myosin light chains and decreased amounts of slow myosin light chains and fatty acid-binding protein. In the flight AL, absolute mitochondrial content decreased, but the relatively greater breakdown of myofibrillar proteins maintained mitochondrial concentration near normal in the central intermyofibrillar regions of fibers. Subsarcolemmal mitochondria were preferentially lost and reduced below normal concentration. Elevated fiber immunostaining for ubiquitin conjugates was suggestive of ubiquitin-mediated mediated breakdown of myofibrillar proteins. On return to weight bearing for 8-11 h, the weakened atrophic muscles exhibited eccentric contraction-like lesions (hyperextension of sarcomeres with A-band filaments pulled apart and fragmented), tearing of the supporting connective tissue, and thrombosis of the microcirculation. Segmental necrosis of muscle fibers, denervation of neuromuscular junctions, and extravasation of red blood cells were minimal. Lymphocyte antibody markers did not indicate a significant immune reaction. The flight AL exhibited threefold more eccentric-like lesions than the unloaded AL; the high reentry G forces experienced by the flight animals, but not the unloaded group, possibly accounted for this difference. Muscle atrophy appears to increase the susceptibility to form eccentric contraction-like-lesions after reloading; this may reflect weakening of the myofibrils and extracellular matrix. Microcirculation was also compromised by spaceflight, such that there was increased formation of thrombi in the post-capillary venules and capillaries. This blockage led to edema by 8-11 h after resumption of weight bearing by the COSMOS 2044 rats. The present findings indicate that defective micro-circulation most likely accounted for the extensive tissue necrosis and microhemorrhages observed for COSMOS 1887 rats killed 2 days after landing. C1 SAN JOSE STATE UNIV,DEPT CHEM,SAN JOSE,CA 95192. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV SYDNEY,DEPT PHYSIOL,SYDNEY,NSW 2006,AUSTRALIA. MINIST PUBL HLTH USSR,INST BIOMED PROBLEMS,MOSCOW,USSR. RP RILEY, DA (reprint author), MED COLL WISCONSIN,DEPT CELL BIOL & ANAT,8701 WATERTOWN PLANK RD,MILWAUKEE,WI 53226, USA. NR 35 TC 57 Z9 60 U1 1 U2 2 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 8750-7587 J9 J APPL PHYSIOL JI J. Appl. Physiol. PD AUG PY 1992 VL 73 IS 2 SU S BP S33 EP S43 PG 11 WC Physiology; Sport Sciences SC Physiology; Sport Sciences GA JL194 UT WOS:A1992JL19400007 PM 1382050 ER PT J AU SHACKELFORD, ME TOBEY, RA AF SHACKELFORD, ME TOBEY, RA TI PRELIMINARY-REPORT ON THE USE OF ZINC INVIVO TO PROTECT AGAINST NITROGEN-MUSTARD TOXICITY IN FEMALE BALB/CJ MICE SO JOURNAL OF APPLIED TOXICOLOGY LA English DT Note DE BALB/CJ MICE; NITROGEN MUSTARD; TOXICITY; INVIVO PROTECTIVE RESPONSE; ZINC; ALKYLATING AGENT ID INDUCED RESISTANCE; TUMOR-CELLS; MELPHALAN AB Previous studies with cultured normal human fibroblasts indicated that treatment of cells with zinc before exposure to an alkylating agent enhanced cell survival by seven- to ninefold. To established whether a similar zinc-induced protective response could be elicited in vivo, we conducted a preliminary experiment in which Balb/cJ female mice were treated with zinc (2 mg kg-1 body weight) or saline by intraperitoneal (i.p.) injection at 48, 36, 24 and 12 h before i.p. administration of the alkylating agent nitrogen mustard (4 mg kg-1 body weight). Of the animals that received saline before nitrogen mustard, 57% died as compared with only 20% in the group treated with zinc before administration of the alkylating agent. As was observed in the studies of cells in culture, the results described in this report may suggest the existence in Balb/cJ female mice of a zinc-mediated protective response against nitrogen mustard toxicity. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI MSM880,LOS ALAMOS,NM 87545. NR 10 TC 3 Z9 3 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0260-437X J9 J APPL TOXICOL JI J. Appl. Toxicol. PD AUG PY 1992 VL 12 IS 4 BP 291 EP 293 DI 10.1002/jat.2550120414 PG 3 WC Toxicology SC Toxicology GA JF488 UT WOS:A1992JF48800012 PM 1430781 ER PT J AU SHACKELFORD, ME TOBEY, RA AF SHACKELFORD, ME TOBEY, RA TI ATTEMPTED USE OF ZINC INVIVO TO PROTECT AGAINST NITROGEN-MUSTARD TOXICITY IN TUMOR-FREE AND IN L1210 LEUKEMIA-BEARING FEMALE B6D2F(1) MICE SO JOURNAL OF APPLIED TOXICOLOGY LA English DT Note DE B6D2F(1) MICE; NITROGEN MUSTARD; TOXICITY; INVIVO PROTECTIVE RESPONSE; ZINC; ALKYLATING AGENT ID PRODUCTS AB The use of alkylating agents in treating cancer is limited by their toxicity to both normal and tumor tissue. Early in vitro studies indicated that zinc might be effective in mitigating this toxicity to normal tissue. The present studies were done to determine the capability of zinc to induce in vivo a protective response to an alkylating agent without also contributing to mortality. Tumor-free and L1210 leukemia-bearing female B6D2F1 mice were treated with zinc before administration of the alkylating agent nitrogen mustard. Protocols for administration route and frequency as well as the chemical formulation of the zinc were varied. The effect of a phytate-free diet was studied. Two parameters were used to determine the effectiveness of zinc in protecting animals from the toxicity of nitrogen mustard: the number of tumor-free mice that survived and an increase in the median life span of the tumor-bearing mice. The zinc-induction protocols used in these studies provided a limited degree of protection against nitrogen mustard toxicity in tumor-free female mice, but in tumor-bearing animals the protective response elicited with the protocols examined did not provide an appreciable therapeutic benefit. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI MSM880,LOS ALAMOS,NM 87545. NR 9 TC 3 Z9 3 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0260-437X J9 J APPL TOXICOL JI J. Appl. Toxicol. PD AUG PY 1992 VL 12 IS 4 BP 295 EP 300 DI 10.1002/jat.2550120415 PG 6 WC Toxicology SC Toxicology GA JF488 UT WOS:A1992JF48800013 PM 1430782 ER PT J AU KINNEY, JH LANE, N MAJUMDAR, S MARSHALL, SJ MARSHALL, GW AF KINNEY, JH LANE, N MAJUMDAR, S MARSHALL, SJ MARSHALL, GW TI NONINVASIVE, 3-DIMENSIONAL HISTOMORPHOMETRY USING X-RAY TOMOGRAPHIC MICROSCOPY SO JOURNAL OF BONE AND MINERAL RESEARCH LA English DT Meeting Abstract C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF SAN FRANCISCO,SAN FRANCISCO,CA 94143. NR 0 TC 3 Z9 3 U1 0 U2 0 PU BLACKWELL SCIENCE INC PI MALDEN PA 350 MAIN ST, MALDEN, MA 02148 SN 0884-0431 J9 J BONE MINER RES JI J. Bone Miner. Res. PD AUG PY 1992 VL 7 SU 1 BP S136 EP S136 PG 1 WC Endocrinology & Metabolism SC Endocrinology & Metabolism GA JL595 UT WOS:A1992JL59500174 ER PT J AU WOLFRUM, EJ TURCHI, CS AF WOLFRUM, EJ TURCHI, CS TI REACTOR DYNAMICS IN THE EVALUATION OF PHOTOCATALYTIC OXIDATION-KINETICS - COMMENT SO JOURNAL OF CATALYSIS LA English DT Letter C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP WOLFRUM, EJ (reprint author), N CAROLINA STATE UNIV,DEPT CHEM ENGN,RALEIGH,NC 27695, USA. OI Wolfrum, Edward/0000-0002-7361-8931 NR 5 TC 26 Z9 26 U1 2 U2 4 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9517 J9 J CATAL JI J. Catal. PD AUG PY 1992 VL 136 IS 2 BP 626 EP 628 DI 10.1016/0021-9517(92)90095-Y PG 3 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA JF093 UT WOS:A1992JF09300034 ER PT J AU DESAI, SR FEIGERLE, CS MILLER, JC AF DESAI, SR FEIGERLE, CS MILLER, JC TI MAGIC NUMBERS IN (NO)M+ARN HETEROCLUSTERS PRODUCED BY 2-PHOTON IONIZATION IN A SUPERSONIC EXPANSION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MONTE-CARLO-SIMULATION; RARE-GAS CLUSTERS; RESONANT MULTIPHOTON IONIZATION; ARGON CLUSTERS; NITRIC-OXIDE; VANDERWAALS MOLECULES; SCATTERING ANALYSIS; PHOTO-IONIZATION; XENON CLUSTERS; ION CLUSTERS AB Mixed clusters of the form (NO)(m)Ar(n)(m less-than-or-equal-to 4,n less-than-or-equal-to 22) are produced in a supersonic expansion and photoionized by nonresonant two-photon absorption of 266 nm photons. The ions are subsequently separated and detected by time-of-flight mass spectrometry. Anomalously large relative intensities are observed for the cluster ions, NO+Ar(n)(n = 12,18,22) and (NO)2+Ar(n)(n = 17,21), and are attributed to extra stability of these ions. These "magic numbers" at (m + n) = 13,19,23 are compared to those observed in rare gas clusters and other M+Ar(n) heteroclusters and assigned to icosahedral structures. Other cluster ions of the form (NO)m+NO2, (NO)m+N2O, N2O+Ar(n), and (NO)m+H2O are observed and briefly discussed. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. RP DESAI, SR (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,CHEM PHYS SECT,OAK RIDGE,TN 37831, USA. NR 53 TC 29 Z9 29 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 1 PY 1992 VL 97 IS 3 BP 1793 EP 1799 DI 10.1063/1.463166 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JE891 UT WOS:A1992JE89100019 ER PT J AU RUSCIC, B BERKOWITZ, J AF RUSCIC, B BERKOWITZ, J TI PHOTOIONIZATION MASS-SPECTROMETRIC STUDIES OF THE ISOMERIC TRANSIENT SPECIES CH2SH AND CH3S SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID VACUUM ULTRAVIOLET PHOTODISSOCIATION; GAS-PHASE IONS; PHOTOELECTRON-SPECTROSCOPY; RADICAL CATIONS; PHOTODETACHMENT; METHANETHIOL; KINETICS; SULFIDE; SPECTRA; METHYL AB The products of the reaction of F atoms with CH3SH are studied by photoionization mass spectrometry. Two thresholds, at 7.536 +/- 0.003 eV and 9.262 +/- 0.005 eV, are observed at mass 47, and identified with the adiabatic ionization potentials of CH2SH and CH3S, respectively. These conclusions are confirmed by additional experiments with CD3SH, where an adiabatic ionization potential of 7.522 +/- 0.003 eV is obtained at mass 49 (CD2SH+) and a value of 9.268 +/- 0.005 eV is found at mass 50 (CD3S+). From an earlier appearance potential for CH2SH+ (CH3SH) and the present ionization potential of CH2SH, an upper limit for D0(H-CH2SH) of less-than-or-equal-to 93.97 +/- 0.13 kcal/mol is deduced. By giving weight to the measured proton affinity of CH2S, one obtains D0(H-CH2SH) = 92.4 +/- 2.0 kcal/mol. The corresponding S-H bond energy in CH3SH derived from a recent kinetics-based value for DELTA-H(fo)0(CH3S) is 86.1 +/- 0.6 kcal/mol. A discrepancy in the difference of DELTA-H(fo)0(CH3S+) and DELTA-H(fo)0(CH2SH+) arising from recent theoretical and experimental determinations is resolved in favor of the ab initio values. RP RUSCIC, B (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. RI Ruscic, Branko/A-8716-2008 OI Ruscic, Branko/0000-0002-4372-6990 NR 31 TC 58 Z9 63 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 AUG 1 PY 1992 VL 97 IS 3 BP 1818 EP 1823 DI 10.1063/1.463169 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JE891 UT WOS:A1992JE89100022 ER PT J AU DANG, LX AF DANG, LX TI TEMPERATURE-DEPENDENCE OF INTERACTIONS OF AN ION-PAIR IN WATER - A MOLECULAR-DYNAMICS STUDY SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID AQUEOUS-SOLUTIONS; MEAN FORCE; SIMULATIONS AB We present a comparative study of the potentials of mean force (PMF) and the related thermodynamic properties for Na+-Cl- ion pair using a rigid simple point charge (SPC/E) water model at two different temperatures, 298 and 373 K. The PMFs were calculated using the thermodynamic perturbation theory and the long-range interactions were evaluated using an Ewald summation technique. The PMFs for both temperatures display two minima corresponding to the contact and solvent-separated ion pairs; however, they are different in details. At room temperature, the solvent separated region is favored over the contact region. On the other hand, the calculated PMF at higher temperature indicate that the contact ion pair is more favorable. These observations are in general agreement with a recent Raman study of salt solutions of the similar systems. We also carried out a calculation at room temperature using the spherical truncation technique. The calculated PMF using this technique is somewhat more repulsive compared to the calculated PMF using an Ewald summation technique. However, these PMFs have similar characteristics. When comparing the present calculations with those reported in previous works on the same systems, our calculated PMF at room temperature is identical to the results of simulations using a flexible water model. This result suggests that the more stable solvent-separated ion pair at room temperature may not be due to the inclusion of the internal motions of water molecules. It is probably due to the balancing of the intermolecular forces. RP DANG, LX (reprint author), PACIFIC NW LAB, MOLEC THEORY MODELING & SIMULAT MOLEC SCI RES CTR, POB 999, RICHLAND, WA 99352 USA. NR 15 TC 40 Z9 40 U1 1 U2 6 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 AUG 1 PY 1992 VL 97 IS 3 BP 1919 EP 1921 DI 10.1063/1.463128 PG 3 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JE891 UT WOS:A1992JE89100034 ER PT J AU KLEINSCHMIDT, PD LAU, KH HILDENBRAND, DL AF KLEINSCHMIDT, PD LAU, KH HILDENBRAND, DL TI SUBLIMATION STUDIES OF NPF4 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID FLUORIDES AB The sublimation reaction NpF4(s) = NpF4(g) was measured over the range 820-980 K using Knudsen effusion mass spectrometry. The ionization potential of NpF4(g) is 10.4 +/- 0.3 eV. The enthalpy of sublimation from second law analysis is 288.1 +/- 10.0 kJ mol-1, while the second law entropy of sublimation is 199.1 +/- 11.0 J K-1 mol-1, both at 298 K. The calculated enthalpy of formation of NpF4(g) is -1585.9 +/- 17.0 kJ mol-1 and the entropy is 351.8 +/- 12.0 J K-1 mol-1 at 298 K. C1 SRI INT,MENLO PK,CA 94025. RP KLEINSCHMIDT, PD (reprint author), LOS ALAMOS NATL LAB,DIV NUCL MAT TECHNOL,LOS ALAMOS,NM 87545, USA. NR 11 TC 4 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 1 PY 1992 VL 97 IS 3 BP 1950 EP 1953 DI 10.1063/1.463131 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JE891 UT WOS:A1992JE89100038 ER PT J AU HOLMES, HF MESMER, RE AF HOLMES, HF MESMER, RE TI ISOPIESTIC STUDIES OF AQUEOUS-SOLUTIONS AT ELEVATED-TEMPERATURES .11. ((1-Y)CSCL+YBACL2)(AQ) SO JOURNAL OF CHEMICAL THERMODYNAMICS LA English DT Article ID ALKALI-METAL SULFATES; THERMODYNAMIC PROPERTIES; OSMOTIC COEFFICIENTS; ELECTROLYTES RP HOLMES, HF (reprint author), OAK RIDGE NATL LAB,DIV CHEM,POB 2008,OAK RIDGE,TN 37831, USA. 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 0021-9614 J9 J CHEM THERMODYN JI J. Chem. Thermodyn. PD AUG PY 1992 VL 24 IS 8 BP 829 EP 841 DI 10.1016/S0021-9614(05)80228-9 PG 13 WC Thermodynamics; Chemistry, Physical SC Thermodynamics; Chemistry GA JG144 UT WOS:A1992JG14400006 ER PT J AU LEE, DK HIRSHMAN, SP AF LEE, DK HIRSHMAN, SP TI RAPID-DETERMINATION OF A STRAIGHT MAGNETIC COORDINATE SYSTEM FOR STELLARATOR CONFIGURATIONS SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article RP LEE, DK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 6 TC 0 Z9 0 U1 1 U2 1 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 AUG PY 1992 VL 101 IS 2 BP 330 EP 333 DI 10.1016/0021-9991(92)90010-V PG 4 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA JH155 UT WOS:A1992JH15500010 ER PT J AU BELL, JB MARCUS, DL AF BELL, JB MARCUS, DL TI A 2ND-ORDER PROJECTION METHOD FOR VARIABLE-DENSITY FLOWS SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID NAVIER-STOKES EQUATIONS; FREE-SURFACE; VORTEX PAIR; INSTABILITY RP BELL, JB (reprint author), LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 25 TC 166 Z9 170 U1 0 U2 4 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0021-9991 EI 1090-2716 J9 J COMPUT PHYS JI J. Comput. Phys. PD AUG PY 1992 VL 101 IS 2 BP 334 EP 348 DI 10.1016/0021-9991(92)90011-M PG 15 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA JH155 UT WOS:A1992JH15500011 ER PT J AU BASARAN, OA AF BASARAN, OA TI NONLINEAR OSCILLATIONS OF VISCOUS-LIQUID DROPS SO JOURNAL OF FLUID MECHANICS LA English DT Article ID INVISCID DROPS; RESONANCE; GRAVITY AB A fundamental understanding of nonlinear oscillations of a viscous liquid drop is needed in diverse areas of science and technology. In this paper, the moderate- to large-amplitude axisymmetric oscillations of a viscous liquid drop, which is immersed in dynamically inactive surroundings, are analysed by solving the free boundary problem comprised of the Navier-Stokes system and appropriate interfacial conditions at the drop-ambient fluid interface. The means are the Galerkin/finite-element technique, an implicit predictor-corrector method, and Newton's method for solving the resulting system of nonlinear algebraic equations. Attention is focused here on oscillations of drops that are released from an initial static deformation. Two dimensionless groups govern such nonlinear oscillations: a Reynolds number, Re, and some measure of the initial drop deformation. Accuracy is attested by demonstrating that (i) the drop volume remains virtually constant, (ii) dynamic response to small- and moderate-amplitude disturbances agrees with linear and perturbation theories, and (iii) large-amplitude oscillations compare well with the few published predictions made with the marker-and-cell method and experiments. The new results show that viscous drops that are released from an initially two-lobed configuration spend less time in prolate form than inviscid drops, in agreement with experiments. Moreover, the frequency of oscillation of viscous drops released from such initially two-lobed configurations decreases with the square of the initial amplitude of deformation as Re gets large for moderate-amplitude oscillations, but the change becomes less dramatic as Re falls and/or the initial amplitude of deformation rises. The rate at which these oscillations are damped during the first period rises as initial drop deformation increases; thereafter the damping rate is lower but remains virtually time-independent regardless of Re or the initial amplitude of deformation. The new results also show that finite viscosity has a much bigger effect on mode coupling phenomena and, in particular, on resonant mode interactions than might be anticipated based on results of computations incorporating only an infinitesimal amount of viscosity. RP OAK RIDGE NATL LAB, DIV CHEM TECHNOL, OAK RIDGE, TN 37831 USA. NR 39 TC 118 Z9 121 U1 2 U2 22 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0022-1120 EI 1469-7645 J9 J FLUID MECH JI J. Fluid Mech. PD AUG PY 1992 VL 241 BP 169 EP 198 DI 10.1017/S002211209200199X PG 30 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA JK831 UT WOS:A1992JK83100008 ER PT J AU HANSSEN, A MJOLHUS, E DUBOIS, DF ROSE, HA AF HANSSEN, A MJOLHUS, E DUBOIS, DF ROSE, HA TI NUMERICAL TEST OF THE WEAK TURBULENCE APPROXIMATION TO IONOSPHERIC LANGMUIR TURBULENCE SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID PARAMETRIC DECAY INSTABILITY; SATURATION SPECTRUM; HEATING EXPERIMENTS; PLASMA-WAVES; COLLAPSE; ARECIBO; EXCITATION; SIMULATION; NUCLEATION; EVOLUTION AB The standard weak Langmuir turbulence approach to explain the artificial plasma line in ionospheric radio modification experiments is examined. We compared solutions of a weak turbulence approximation (WTA) derived from a version of the one-dimensional driven and damped Zakharov system of equations (ZSE) with solutions to the same full ZSE. The electromagnetic pump field is modeled as a long-wavelength parametric driving term. We found that from a certain distance below the O mode reflection level the wave number saturation spectra computed from the WTA agree qualitatively with those from the ZSE for weak driving strengths, in the sense that the number of cascade lines increases with increasing pump strength. However, in general, the number of cascades apparent in the WTA solutions is larger than that predicted form the full ZSE. At higher intensities of the driver the saturation spectra from the ZSE differ from the WTA cascade spectra, in that a truncation of the cascade sets in, with a subsequent filling in of the bands between the cascades. This truncation takes place far before the ZSE cascade spectra reach the so-called "Langmuir condensate," contrary to earlier conjectures based mainly on dimensional analysis arguments. In the reflection region a qualitatively different process takes place: temporal cycles of large ensembles of localized events; nucleation of cavitons, collapse, and burnout constitute the basic elements of the turbulence in this region of space. No WTA exists for this region. Our findings are discussed with respect to the experiments performed at Arecibo and Tromso, the conclusion being that the ZSE yields results closer to observations than does the WTA, in all regions of space. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP HANSSEN, A (reprint author), UNIV TROMSO,INST MATH & PHYS SCI,N-9000 TROMSO,NORWAY. NR 56 TC 61 Z9 61 U1 0 U2 4 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 AUG 1 PY 1992 VL 97 IS A8 BP 12073 EP 12091 DI 10.1029/92JA00874 PG 19 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JH648 UT WOS:A1992JH64800005 ER PT J AU FREEMAN, MP SOUTHWOOD, DJ LESTER, M YEOMAN, TK REEVES, GD AF FREEMAN, MP SOUTHWOOD, DJ LESTER, M YEOMAN, TK REEVES, GD TI SUBSTORM-ASSOCIATED RADAR AURORAL SURGES SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID ENERGETIC PARTICLE MEASUREMENTS; NORTH-SOUTH COMPONENT; MAGNETOSPHERIC SUBSTORMS; PLASMA CONVECTION; IONOSPHERE; MODEL; IRREGULARITIES; BACKSCATTER; DEPENDENCE; PULSATIONS AB We report a recurrent convection signature observed in the E region ionosphere within approximately 2 hours of the dusk meridian by the SABRE radar facility. In a typical event, the irregularity drift speed in the SABRE field of view is seen to increase from about 300 m s-1 to of the order of 1 km s-1 in the space of about 10 min. The speed subsequently remains at the enhanced level for 10 min or longer before declining as rapidly as its onset. The total event duration ranges between 30 min and 1 hour. As the irregularity drift speed increases the direction of the drift velocity changes, rotating poleward. At the same time, the radar backscatter power decreases. The onset of the drift speed enhancement crosses the SABRE field of view as a front moving from east to west. Detailed study of individual events indicates that the events are associated with increases in the \AL\ index and with the injection of energetic particles into geosynchronous orbit. We thus suggest that the events are part of the magnetospheric response to the onset of a geomagnetic substorm. However, while each event appears to be associated with a substorm onset, not every substorm onset is associated with an event, at least not at SABRE. We estimate the speed at which the substorm-initiated ionospheric flow enhancement moves from the nightside to be 1-4 km s-1, a figure that is consistent with the rate at which the drift velocity front crosses the SABRE field of view. Although the front is associated with a rotation in the drift velocity, we see little evidence of strong vertical vorticity as the front passes. However, shears in the flow do develop subsequently which seem likely to correspond to field-aligned current. Although associated with substorm onset, we argue that these events are distinct from westward traveling surges and appear to differ from the mid-latitude phenomenon known as subauroral ion drifts. We thus call this new-found signature a substorm-associated radar auroral surge or SARAS event. C1 UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND. UNIV LEICESTER,DEPT PHYS & ASTRON,LEICESTER LE1 7RH,ENGLAND. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RI Yeoman, Timothy/L-9105-2014; Reeves, Geoffrey/E-8101-2011 OI Yeoman, Timothy/0000-0002-8434-4825; Reeves, Geoffrey/0000-0002-7985-8098 NR 27 TC 26 Z9 26 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD AUG 1 PY 1992 VL 97 IS A8 BP 12173 EP 12185 DI 10.1029/92JA00697 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JH648 UT WOS:A1992JH64800013 ER PT J AU HASSANI, AV AF HASSANI, AV TI NATURAL-CONVECTION HEAT-TRANSFER FROM CYLINDERS OF ARBITRARY CROSS-SECTION SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME LA English DT Note DE NATURAL CONVECTION ID CORRELATING EQUATIONS; LAMINAR; BODIES RP HASSANI, AV (reprint author), NATL RENEWABLE ENERGY LAB,THERMAL FLUID & OPT SCI BRANCH,GOLDEN,CO 80401, USA. NR 37 TC 11 Z9 11 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-1481 J9 J HEAT TRANS-T ASME JI J. Heat Transf.-Trans. ASME PD AUG PY 1992 VL 114 IS 3 BP 768 EP 773 DI 10.1115/1.2911349 PG 6 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA JL491 UT WOS:A1992JL49100034 ER PT J AU CLEM, JR HAO, ZD DOBROSAVLJEVICGRUJIC, L RADOVIC, Z AF CLEM, JR HAO, ZD DOBROSAVLJEVICGRUJIC, L RADOVIC, Z TI VORTICES IN ANISOTROPIC TYPE-II SUPERCONDUCTORS SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article ID LOWER CRITICAL-FIELD AB We present a generalized variational model of an isolated vortex, valid in the anisotropic case when the external magnetic field is along one of the symmetry directions. We discuss the effects of the field anisotropy on the core and magnetic pinning of individual vortices. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. INST PHYS,BELGRADE,YUGOSLAVIA. FAC SCI BELGRADE,DEPT PHYS,BELGRADE,YUGOSLAVIA. RP CLEM, JR (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 10 TC 7 Z9 7 U1 0 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD AUG PY 1992 VL 88 IS 3-4 BP 213 EP 219 DI 10.1007/BF00162958 PG 7 WC Physics, Applied; Physics, Condensed Matter SC Physics GA JL383 UT WOS:A1992JL38300002 ER PT J AU ROUSSEAU, F JAIN, A KODAS, TT HAMPDENSMITH, M FARR, JD MUENCHAUSEN, R AF ROUSSEAU, F JAIN, A KODAS, TT HAMPDENSMITH, M FARR, JD MUENCHAUSEN, R TI LOW-TEMPERATURE DRY ETCHING OF METAL-OXIDES AND ZNS VIA FORMATION OF VOLATILE METAL BETA-DIKETONATE COMPLEXES SO JOURNAL OF MATERIALS CHEMISTRY LA English DT Note DE ETCHING; METAL OXIDE; BETA-DIKETONATE ID COPPER; SURFACE AB The reactions of CuO, PbO, ZnO, ZnS, V2O5, PbTiO3, PbZrO3, and YBa2Cu3O7-x with 1,1,1,5,5,5-hexafluoroacetylacetone result in formation of the corresponding metal beta-diketonates with etch rates of 1-mu-m min-1 for mixed copper(I)/(II) oxide films. C1 UNIV NEW MEXICO,DEPT CHEM ENGN,ALBUQUERQUE,NM 87131. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. NR 21 TC 31 Z9 31 U1 1 U2 10 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0959-9428 J9 J MATER CHEM JI J. Mater. Chem. PD AUG PY 1992 VL 2 IS 8 BP 893 EP 894 DI 10.1039/jm9920200893 PG 2 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA JJ201 UT WOS:A1992JJ20100017 ER PT J AU HUFNAGEL, TC BRENNAN, S PAYNE, AP CLEMENS, BM AF HUFNAGEL, TC BRENNAN, S PAYNE, AP CLEMENS, BM TI OBSERVATION OF A RAPID AMORPHIZATION REACTION SO JOURNAL OF MATERIALS RESEARCH LA English DT Note ID INTERDIFFUSION; MULTILAYERS AB We have observed a rapid amorphization reaction at ambient temperature in the Gd/Co system by employing grazing incidence x-ray scattering. We find that a 135 angstrom crystalline Gd film is amorphized in less than 30 min by deposition of Co. We postulate that the rapidity of the reaction is due to surface diffusion of Co atoms after deposition to fast diffusion sites such as grain boundaries in the Gd film. Once the interfacial region has been amorphized these fast diffusion paths are sealed off from the surface, rapid diffusion of Co into the Gd crystalline layer is prevented, and the amorphization reaction stops. C1 STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. RP HUFNAGEL, TC (reprint author), STANFORD UNIV,DEPT MAT SCI & ENGN,STANFORD,CA 94305, USA. RI Hufnagel, Todd/A-3309-2010 OI Hufnagel, Todd/0000-0002-6373-9377 NR 9 TC 18 Z9 18 U1 0 U2 2 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD AUG PY 1992 VL 7 IS 8 BP 1976 EP 1979 DI 10.1557/JMR.1992.1976 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA JH823 UT WOS:A1992JH82300004 ER PT J AU COPPA, NV MYER, GH SALOMON, RE BURA, A OREILLY, JW CROW, JE DAVIES, PK AF COPPA, NV MYER, GH SALOMON, RE BURA, A OREILLY, JW CROW, JE DAVIES, PK TI PREPARATION, THERMAL-PROCESSING BEHAVIOR, AND CHARACTERIZATION OF YBCO FROM FREEZE-DRIED NITRATE PRECURSORS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID OXIDES AB YBCO was synthesized using atomically mixed nitrate precursors. Atomic mixing was achieved using a freeze-dried process which is fully discussed here. The thermal processing behavior of these precursors is fundamentally different from that of mechanical mixtures of the Y, Ba, and Cu oxides and it is examined in detail. Ba2Cu3O5+x (normally considered a high oxygen pressure phase) and Y2O3 formed as nitrate decomposition products at ambient atmospheric conditions. Subsequent reaction of these materials (2 h at 925-degrees-C) produced polycrystalline YBCO. Without any post-processing of the powders, product YBCO powders consisted of 30-mu-m agglomerates composed of crystals 1-3-mu-m on an edge. The powdered products exhibited a magnetic susceptibility greater than 90% - 1/4-pi. C1 TEMPLE UNIV,CTR MAT SCI,PHILADELPHIA,PA 19122. FLORIDA STATE UNIV,CTR MAT RES & TECHNOL,TALLAHASSEE,FL 32306. UNIV PENN,DEPT MAT SCI,PHILADELPHIA,PA 19104. RP COPPA, NV (reprint author), LOS ALAMOS NATL LAB,CTR EXPLORATORY RES & DEV,LOS ALAMOS,NM 87545, USA. NR 27 TC 12 Z9 12 U1 0 U2 3 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD AUG PY 1992 VL 7 IS 8 BP 2017 EP 2026 DI 10.1557/JMR.1992.2017 PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA JH823 UT WOS:A1992JH82300011 ER PT J AU HOLESINGER, TG MILLER, DJ FLESHLER, S CHUMBLEY, LS AF HOLESINGER, TG MILLER, DJ FLESHLER, S CHUMBLEY, LS TI PROCESSING OF BI-SR-CA-CU-O GLASSES USING PLATINUM AND ALUMINA CRUCIBLES SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID SYSTEM; CERAMICS AB Reactions with alumina and platinum crucibles were studied during the preparation of Bi2Sr2Ca1Cu2Oy "2212" glasses. In particular, reactions with Al2O3 are of interest since alumina is a potential substrate material in applications of this superconductor. Glasses processed using alumina crucibles were completely homogeneous and free of secondary phases although the material contained 2.26 at. % Al in solution. After heat treatments, Al was found in the form of SrCaAlOy particles located primarily along grain boundaries of the 2212 superconducting phase. Platinum contamination was minimal (<0.02 at. %) and no Pt-containing secondary phases were found in amorphous or annealed samples. Glasses made with Pt crucibles were found to contain small amounts of CaO, Sr14-xCaxCu24O41, and 2201 as second phases. Differential thermal analysis (DTA) suggested that the crystallization processes were essentially the same for all samples although the small amount of Al seemed to slow the kinetics leading to the formation of 2212. Neither Al nor Pt was detected within the 2212 phase. The measured superconducting compositions in each annealed sample were nearly the same with identical transition temperatures of 88 K. Overall differences in stoichiometry were accommodated by changes in the number and composition of the secondary phases present. C1 ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. AMES LAB,AMES,IA 50011. RP HOLESINGER, TG (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 10 TC 11 Z9 11 U1 0 U2 2 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD AUG PY 1992 VL 7 IS 8 BP 2035 EP 2039 DI 10.1557/JMR.1992.2035 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA JH823 UT WOS:A1992JH82300013 ER PT J AU HEMKER, KJ MILLS, MJ NIX, WD AF HEMKER, KJ MILLS, MJ NIX, WD TI A CRITICAL ANALYSIS OF EXISTING MODELS FOR PLASTIC-FLOW IN NI3AL - COMPARISONS WITH TRANSIENT DEFORMATION EXPERIMENTS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID 110 SCREW DISLOCATIONS; LI-2 ORDERED ALLOYS; SINGLE-CRYSTALS; STRAIN RATE; WEAK-BEAM; TEMPERATURE-DEPENDENCE; CORE STRUCTURE; YIELD STRESS; BEHAVIOR; DISSOCIATION AB A review of the intermediate temperature creep properties of Ni3Al indicates that octahedral glide, the mechanism associated with the anomalous temperature dependence of yielding in this alloy, is exhausted during primary creep. Comparisons of this primary creep transient with the various models proposed to explain the anomalous yielding behavior suggest that additional transient experiments are needed to fully characterize octahedral glide in this alloy. Cottrell-Stokes type temperature change experiments, stress relaxation experiments, and deformation exhaustion/temperature drop tests have been conducted in an attempt to better characterize octahedral glide in Ni3Al. The results of these transient experiments indicate that octahedral glide is only partially a thermally reversible process and that the formation of dislocation substructure, KW locks, plays an important role in determining the flow strength of this alloy. These experiments also suggest that flow in Ni3Al should not be viewed as a viscous drag process, but can best be described as a "pure-metal-like" process involving the rapid motion of a small number of highly mobile dislocations. The stochastic nature of dislocation motion and the importance of substructure formation are emphasized and a description of octahedral glide that is consistent with the transient deformation experiments is proposed. C1 STANFORD UNIV,DEPT MAT SCI & ENGN,STANFORD,CA 94305. SANDIA NATL LABS,DEPT MAT,LIVERMORE,CA 94551. RI Hemker, Kevin/A-3315-2010 NR 36 TC 21 Z9 21 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 AUG PY 1992 VL 7 IS 8 BP 2059 EP 2069 DI 10.1557/JMR.1992.2059 PG 11 WC Materials Science, Multidisciplinary SC Materials Science GA JH823 UT WOS:A1992JH82300016 ER PT J AU HOAGLAND, RG HEINISCH, HL AF HOAGLAND, RG HEINISCH, HL TI AN ATOMIC SIMULATION OF THE INFLUENCE OF HYDROGEN ON THE FRACTURE-BEHAVIOR OF NICKEL SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID CRACK; EMBRITTLEMENT; MODEL AB A model exploring the effect of the presence of a single hydrogen interstitial on the crack tip configuration of nickel is described. The model is based on a EAM-type potential developed by Daw, Baskes, Bisson, and Wolfer for describing the Ni-Ni, Ni-H, and H-H interactions, and involves the crack tip region of a semi-infinite crack in an infinite solid. Several types of interactions are observed to occur. In a model oriented such that dislocation emission is difficult, hydrogen is observed to increase the crack tip opening displacement (CTOD), exert a force on the crack tip due to interaction between the dilatancy of the defect and the hydrostatic component of the field of the crack, and increase the local tensile stresses. However, the largest contribution to extending the crack derives from the energy released when a hydrogen interstitial escapes to the crack surface. A hydrogen interstitial is also observed to assist dislocation emission in models with an easy emission orientation. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP HOAGLAND, RG (reprint author), WASHINGTON STATE UNIV, DEPT MECH & MAT ENGN, PULLMAN, WA 99164 USA. RI Hoagland, Richard/G-9821-2012 NR 12 TC 22 Z9 22 U1 0 U2 2 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD AUG PY 1992 VL 7 IS 8 BP 2080 EP 2088 DI 10.1557/JMR.1992.2080 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA JH823 UT WOS:A1992JH82300018 ER PT J AU MCKAMEY, CG MAZIASZ, PJ JONES, JW AF MCKAMEY, CG MAZIASZ, PJ JONES, JW TI EFFECT OF ADDITION OF MOLYBDENUM OR NIOBIUM ON CREEP-RUPTURE PROPERTIES OF FE3AL SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID SLOW PLASTIC-FLOW; FE-AL; ALLOYS; EMBRITTLEMENT; BEHAVIOR; SYSTEM; PHASE AB Recent alloy development efforts have shown that Fe3Al-based alloys can have room temperature tensile ductilities of 10-20% and yield strengths of 500 MPa at temperatures to 600-degrees-C. These property improvements are important for enabling the use of iron-aluminides for structural applications that require their excellent corrosion resistance. New data are presented here from creep-rupture studies on Fe3Al and on Fe3Al-based alloys containing molybdenum or niobium plus zirconium. Binary Fe3Al alloys have low creep resistance, but the addition of 2 at.% Mo or 1% Nb plus 0.1% Zr increases the creep life and reduces the minimum creep rate, with the niobium-containing alloy being the strongest. The improvement in creep life is the result of a combination of factors which include grain boundary strengthening, resistance to dynamic recrystallization during stressing, precipitation strengthening, and changes in the formation and mobility of the dislocation network. Correlation of optical, scanning electron, and transmission electron microscopy data suggests that the intergranular creep failure found in Fe3Al after creep testing at 550-650-degrees-C is related to weak high-angle grain boundaries and to formation of subgrain boundary arrays, which reduce the ability of dislocations to glide or multiply to produce matrix plasticity. The addition of niobium/zirconium results in solid solution strengthening effects, as well as the formation of fine MC precipitates (a small amount of carbon is present as a contaminant from the casting process) which strengthen both the matrix and grain boundaries. The result relative to the binary alloy is increased creep-rupture strength and life coupled with a change to a ductile-dimple transgranular failure mode. This suggests that the mechanisms that cause failure during creep can be controlled by macro- and microalloying effects. RP MCKAMEY, CG (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. OI Maziasz, Philip/0000-0001-8207-334X NR 51 TC 101 Z9 105 U1 0 U2 10 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 AUG PY 1992 VL 7 IS 8 BP 2089 EP 2106 DI 10.1557/JMR.1992.2089 PG 18 WC Materials Science, Multidisciplinary SC Materials Science GA JH823 UT WOS:A1992JH82300019 ER PT J AU ASSINK, RA SCHIRBER, JE LOY, DA MOROSIN, B CARLSON, GA AF ASSINK, RA SCHIRBER, JE LOY, DA MOROSIN, B CARLSON, GA TI INTERCALATION OF MOLECULAR-SPECIES INTO THE INTERSTITIAL SITES OF FULLERENE SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID 2 DIFFERENT FULLERENES; CYCLIC VOLTAMMETRY; SOLID-STATE; C60; BUCKMINSTERFULLERENE; C-60; TRANSITION; CHEMISTRY; RESONANCE; CARBON AB Molecular species were found to diffuse readily into the octahedral interstitial sites of the fcc lattice of C60. The C-13 NMR spectrum of C60 under magic angle spinning (MAS) conditions consisted of a primary resonance at 143.7 ppm and a minor peak shifted 0.7 ppm downfield. The downfield shift obeys Curie's law and is attributed to the Fermi-contact interaction between paramagnetic oxygen molecules and all 60 carbon atoms of rapidly rotating adjacent C60 molecules. Exposure Of C60 to 1 kbar oxygen for 1.75 h at room temperature resulted in a spectrum of seven evenly spaced resonances corresponding to the filling of 0 to 6 of the adjacent octahedral interstitial sites with oxygen molecules. The distribution of site occupancies about a C60 molecule provided evidence that the intercalation process is controlled by diffusion kinetics. Exposure to 0.14 kbar hydrogen gas at room temperature for 16 h filled a substantial fraction of the interstitial sites of C60 and C70 with hydrogen molecules. RP ASSINK, RA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI Loy, Douglas/D-4847-2009 OI Loy, Douglas/0000-0001-7635-9958 NR 30 TC 155 Z9 156 U1 4 U2 23 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 AUG PY 1992 VL 7 IS 8 BP 2136 EP 2143 DI 10.1557/JMR.1992.2136 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA JH823 UT WOS:A1992JH82300025 ER PT J AU PRETTYMAN, KM JUE, JF VIRKAR, AV HUBBARD, CR CAVIN, OB FERBER, MK AF PRETTYMAN, KM JUE, JF VIRKAR, AV HUBBARD, CR CAVIN, OB FERBER, MK TI HYSTERESITY EFFECTS IN 3MOL PERCENT YTTRIA-DOPED ZIRCONIA (T'-PHASE) SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID ARC-MELTED ZRO2-2MOL-PERCENT-Y2O3; TETRAGONAL ZIRCONIA; SINGLE-CRYSTALS; MONOCLINIC TRANSFORMATION; STABILIZED ZIRCONIA; SYSTEM; ZRO2; T'-ZIRCONIA; DEFORMATION; ZRO2-Y2O3 AB Single-crystal and polycrystal samples of 3 mol % Y2O3-doped zirconia (t'-phase) were subjected to uniaxial compression tests at 1 000-degrees-C in order to separate the effects of phase transformation (tetragonal-to-monoclinic) from ferroelastic domain switching. Plastic deformation was observed after an elastic regime, with attributes characteristic of domain switching. X-ray diffraction traces at room and high temperatures before and after the compression test verified that there was, indeed, a variant reorientation within each sample. Deformation bands were observed on single crystals, and Raman spectroscopy revealed that no monoclinic phase was present. These results verify the existence of ferroelastic domain switching phenomenon in this material. C1 OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. RP PRETTYMAN, KM (reprint author), UNIV UTAH, DEPT MAT SCI & ENGN, 304 EMRO, SALT LAKE CITY, UT 84112 USA. RI Gentleman, Molly/A-7137-2010 NR 28 TC 17 Z9 17 U1 0 U2 4 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0022-2461 EI 1573-4803 J9 J MATER SCI JI J. Mater. Sci. PD AUG 1 PY 1992 VL 27 IS 15 BP 4167 EP 4174 DI 10.1007/BF01105121 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA JH165 UT WOS:A1992JH16500029 ER PT J AU NIVENS, DE JACK, R VASS, A GUCKERT, JB CHAMBERS, JQ WHITE, DC AF NIVENS, DE JACK, R VASS, A GUCKERT, JB CHAMBERS, JQ WHITE, DC TI MULTIELECTRODE PROBE FOR STATISTICAL EVALUATION OF MICROBIOLOGICALLY INFLUENCED CORROSION SO JOURNAL OF MICROBIOLOGICAL METHODS LA English DT Article DE MICROBIOLOGICALLY INFLUENCED CORROSION; MULTIELECTRODE; STATISTICS ID STAINLESS-STEEL AB Microbial biofilms increase the complexity and spatial variation of the interfacial chemistry occurring at metal surfaces and can facilitate corrosion. A multi-electrode probe was designed to replicate interfacial chemistry by providing multiple interfaces on a single probe. Electrochemical impedance spectroscopy (EIS) was used to examine the electrochemical properties of four-electrode probes containing 430 (USN430000) stainless steel coupons in test solutions. The EIS results obtained with the probe were compared to the ASTM G-106 standard method, and the probe was determined to be accurate. In addition, no interference or crosstalk between electrode channels was observed. In order to demonstrate the utility of the probe, four-electrode probes were used to investigate microbiologically influenced corrosion of C1020 carbon steel. Enrichments of aerobic, fermentative, and sulfate reducing bacteria from a corrosion tubercle were inoculated into the bulk phase of a corrosion cell and formed biofilms on the carbon steel electrodes. A five fold increase in the polarization admittance of carbon steel coupons exposed to biofilms relative to sterile medium was observed, The four-electrode probe provided the necessary degrees of freedom to show the statistically significant differences. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37932. UNIV TENNESSEE,CTR ENVIRONM BIOTECHNOL,KNOXVILLE,TN 37932. UNIV TENNESSEE,DEPT MICROBIOL,KNOXVILLE,TN 37932. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. NR 22 TC 5 Z9 5 U1 2 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-7012 J9 J MICROBIOL METH JI J. Microbiol. Methods PD AUG PY 1992 VL 16 IS 1 BP 47 EP 58 DI 10.1016/0167-7012(92)90024-X PG 12 WC Biochemical Research Methods; Microbiology SC Biochemistry & Molecular Biology; Microbiology GA JK156 UT WOS:A1992JK15600006 ER PT J AU TILLOTSON, TM HRUBESH, LW AF TILLOTSON, TM HRUBESH, LW TI TRANSPARENT ULTRALOW-DENSITY SILICA AEROGELS PREPARED BY A 2-STEP SOL-GEL PROCESS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL SYMP ON AEROGELS ( ISA-3 ) CY SEP 30-OCT 02, 1991 CL WURZBURG, GERMANY SP DEUT FORSCHUNGSGEMEINSCH, UNIV WURZBURG, BASF, BMW, HENKEL, VIESSMANN ALLENDORF ID SPECTROSCOPY AB Interest in lowering aerogel densities for applications involving high energy charged particle detection via the Cherenkov effect has led to the development of a two-step sol-gel method for preparing ultralow-density aerogels. This method has been used in the authors' laboratories to produce uncracked, transparent aerogel tiles with densities from 3 to 80 kg/m3. Comparative characterization of conventional single-step base-catalyzed aerogels to aerogels prepared by this two-step approach is presented. Results indicate that the aerogel microstructure for the two-step approach differs from the bead-like structure proposed for single-step base-catalyzed TMOS aerogels. TEM micrographs of aerogels prepared by the two-step method show an interlinked polymer-chain-like structure with an average chain diameter of 2-3 nm and an average chain length of approximately 15 nm. UV-VIS spectrophotometry shows the transmittance over the visible spectrum (400-800 nm) to be improved for the two-step aerogels by as much as 30%. Other measurements of the ultralow-density aerogels include BET surface area, and compressive modulus. RP TILLOTSON, TM (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550, USA. NR 13 TC 165 Z9 172 U1 8 U2 84 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD AUG PY 1992 VL 145 IS 1-3 BP 44 EP 50 DI 10.1016/S0022-3093(05)80427-2 PG 7 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA JK837 UT WOS:A1992JK83700008 ER PT J AU PEKALA, RW ALVISO, CT KONG, FM HULSEY, SS AF PEKALA, RW ALVISO, CT KONG, FM HULSEY, SS TI AEROGELS DERIVED FROM MULTIFUNCTIONAL ORGANIC MONOMERS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL SYMP ON AEROGELS ( ISA-3 ) CY SEP 30-OCT 02, 1991 CL WURZBURG, GERMANY SP DEUT FORSCHUNGSGEMEINSCH, UNIV WURZBURG, BASF, BMW, HENKEL, VIESSMANN ALLENDORF ID STRUCTURE PROPERTY BEHAVIOR; HYBRID MATERIALS; FORMALDEHYDE; RESORCINOL; RESINS AB The ability to tailor the structure and properties of aerogels at the nanometer scale opens exciting possibilities for these novel materials. Traditional inorganic aerogels are made via the hydrolysis and condensation of metal alkoxides. Synthesis of organic aerogels based upon the aqueous polycondensation of (1) resorcinol with formaldehyde and (2) melamine with formaldehyde was recently reported. The former materials can also be pyrolyzed in an inert atmosphere to form vitreous carbon aerogels. In both the inorganic and organic systems, the structure and properties of the dried aerogel are dictated by polymerization conditions. Factors such as pH, reactant ratio, and temperature influence the cross-linking chemistry and growth processes taking place prior to gelation. This paper addresses the chemistry structure-property relationships of organic aerogels. RP PEKALA, RW (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550, USA. NR 22 TC 282 Z9 298 U1 8 U2 103 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD AUG PY 1992 VL 145 IS 1-3 BP 90 EP 98 DI 10.1016/S0022-3093(05)80436-3 PG 9 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA JK837 UT WOS:A1992JK83700017 ER PT J AU SCHAEFER, DW OLIVIER, BJ ASHLEY, CS RICHTER, D FARAGO, B FRICK, B HRUBESH, L VANBOMMEL, MJ LONG, G KRUEGER, S AF SCHAEFER, DW OLIVIER, BJ ASHLEY, CS RICHTER, D FARAGO, B FRICK, B HRUBESH, L VANBOMMEL, MJ LONG, G KRUEGER, S TI STRUCTURE AND TOPOLOGY OF SILICA AEROGELS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID GELS; FRACTALS; POLYMERS; DENSITY; STATES AB Neutron spin-echo spectroscopy is used to study the topology of aerogels. Topology or connectivity is varied through precursor chemistry and thermal annealing. Topology is characterized using the concept of fractons (the vibrational excitations of a fractal network). A qualitative difference is observed in the spectrum of polymeric vs. colloidal aerogels, the latter showing a peak in the density of vibrational states. For colloidal aerogels whose structure appears to arise from phase separation in the solution precursor, low-energy excitations were only observed in the lowest density material studied. Finally. a transition from fractal to colloidal microstructure was observed during the sintering of polymeric aerogels. This transformation revealed itself as a transition from a fracton-like to a peaked density of states function. C1 FORSCHUNGSZENTRUM JULICH, INST FESTKORPERFORSCH, W-5170 JULICH 1, GERMANY. INST MAX VON LAUE PAUL LANGEVIN, F-38042 GRENOBLE, FRANCE. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. PHILIPS RES LABS, 5600 JA EINDHOVEN, NETHERLANDS. NATL INST STAND & TECHNOL, GAITHERSBURG, MD 20879 USA. RP SCHAEFER, DW (reprint author), SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. RI Frick, Bernhard/C-2756-2011; Farago, Bela/H-4544-2012; Richter, Dieter/H-3701-2013 OI Richter, Dieter/0000-0003-0719-8470 NR 23 TC 21 Z9 21 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD AUG PY 1992 VL 145 IS 1-3 BP 105 EP 112 DI 10.1016/S0022-3093(05)80438-7 PG 8 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA JK837 UT WOS:A1992JK83700019 ER PT J AU GRAY, WJ LEIDER, HR STEWARD, SA AF GRAY, WJ LEIDER, HR STEWARD, SA TI PARAMETRIC STUDY OF LWR SPENT FUEL DISSOLUTION KINETICS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID AQUEOUS-SOLUTIONS; REACTION-RATES; 70-DEGREES-C; CONSTRAINTS; URANINITE; MINERALS; TIME; PH AB Spent fuel dissolution rates have been measured using a flowthrough system where the uranium concentrations remained well below solubility limits, thus allowing unambiguous reaction rates to be determined. The study was based on a statistically designed test matrix that covered four water chemistry variables: temperature (25 to 75-degrees-C), pH (8 to 10), carbonate/bicarbonate concentration (2 x 10(-4) M to 2 x 10(-2) M), and oxygen fugacity (O2 partial pressure 0.002 to 0.2 atm). Results obtained to date and reported here encompass the first three, all at 0.2 atm O2 partial pressure. The dissolution rate was found to be moderately dependent on temperature but only weakly dependent on pH and carbonate/bicarbonate concentration. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP GRAY, WJ (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 25 TC 28 Z9 28 U1 1 U2 6 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 AUG PY 1992 VL 190 BP 46 EP 52 DI 10.1016/0022-3115(92)90074-U PG 7 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JQ092 UT WOS:A1992JQ09200005 ER PT J AU EINZIGER, RE THOMAS, LE BUCHANAN, HC STOUT, RB AF EINZIGER, RE THOMAS, LE BUCHANAN, HC STOUT, RB TI OXIDATION OF SPENT FUEL IN AIR AT 175 TO 195-DEGREES-C SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article AB Air oxidation tests were conducted on four LWR spent fuels at 175 and 195-degrees-C to determine the effects of variations in burnup, gas release, and grain size on oxidation of fuel in a potential repository. Weight gains were measured and samples were examined by XRD, ceramography, and TEM. The fuel characteristics were found to affect only the initial oxidation behavior. Following transient behavior related to differences in grain-boundary susceptibility to oxidation, all four fuels progressed toward a metastable state at an oxygen-to-metal (O/M) ratio near 2.4. Unlike nonirradiated UO2 under similar conditions, the fuels oxidized preferentially along grain boundaries and formed U4O9 rather than U3O7. Cubic U4O9, the sole oxidation product observed at times to approximately 38000 h, persisted to oxygen supersaturations as high as UO2.4 with no detectable U3O8 formation. Growth of the U4O9 into the UO2 grains followed parabolic kinetics with an activation energy of 26.6 kcal/mol. Based on reaction kinetics, the time to completely oxidize LWR spent fuel to U4O9 at 95-degrees-C would be greater than 2000 years. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP EINZIGER, RE (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 23 TC 34 Z9 34 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD AUG PY 1992 VL 190 BP 53 EP 60 DI 10.1016/0022-3115(92)90075-V PG 8 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JQ092 UT WOS:A1992JQ09200006 ER PT J AU WRONKIEWICZ, DJ BATES, JK GERDING, TJ VELECKIS, E TANI, BS AF WRONKIEWICZ, DJ BATES, JK GERDING, TJ VELECKIS, E TANI, BS TI URANIUM RELEASE AND SECONDARY PHASE FORMATION DURING UNSATURATED TESTING OF UO2 AT 90-DEGREES-C SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID AQUEOUS-SOLUTIONS; 200-DEGREES-C; DISSOLUTION; EQUILIBRIA; URANINITE; PLUTONIUM; WASTE; FUEL AB Experimental results indicate that UO2 will readily react after being exposed to dripping oxygenated ground water at 90-degrees-C. A pulse of rapid U release, combined with the formation of dehydrated schoepite characterizes reactions between one to two years. Rapid dissolution of intergrain boundaries and spallation of UO2 granules appears to be responsible for the rapid U release. Less than 5% of the U is released in a soluble or suspended form. After two years, U release rates decline and a more stable assemblage of uranyl silicate phases form by incorporating cations from the leachant. Uranophane, boltwoodite, and sklodowskite are the final solubility-limiting phases for U in these tests. This observed paragenetic sequence (from uraninite to schoepite to uranyl silicates) is identical to those observed in weathered uraninite deposits. Dispersion of particulate matter may be an important release mechanism for U and other radionuclides in spent nuclear fuel. RP WRONKIEWICZ, DJ (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 42 TC 141 Z9 146 U1 1 U2 15 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD AUG PY 1992 VL 190 BP 107 EP 127 DI 10.1016/0022-3115(92)90081-U PG 21 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JQ092 UT WOS:A1992JQ09200012 ER PT J AU BATES, JK EBERT, WL FENG, X BOURCIER, WL AF BATES, JK EBERT, WL FENG, X BOURCIER, WL TI ISSUES AFFECTING THE PREDICTION OF GLASS REACTIVITY IN AN UNSATURATED ENVIRONMENT SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID SOLUTION VOLUME; SURFACE-AREA; WASTE AB Prior to the licensing of a high-level waste repository, the US Department of Energy (DOE) will seek to initiate hot startup of the high-level waste glass processing facilities at Savannah River and West Valley. To provide confidence that issues related to glass reactivity and disposal are evaluated prior to startup, the Environmental Restoration and Waste Management branch of DOE is studying important physical parameters that will affect glass reaction in a repository environment and is developing a modeling approach to predict glass performance. In this report, results are presented comparing the reactivity of fully radioactive glass with simulated glass of the same nominal composition. While differences in elemental releases between the glass types are observed, the differences are moderated with time and can be related to the dominant reaction mechanism. Additionally, the relationship between glass surface area and the volume of leachate (SA/V) is evaluated. The reactivity at different SA/V is dominated by solution pH and reaction affinity, with an increase in reactivity observed at long reaction times. Finally, data are presented which provide necessary parameters for the application of predictive modeling. In particular, forward reaction rate constants are presented, for a 165-frit based glass and a simple analogue, and a list of secondary phases observed during glass reaction under a variety of conditions is compiled. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP BATES, JK (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 27 TC 6 Z9 6 U1 1 U2 2 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 AUG PY 1992 VL 190 BP 198 EP 227 DI 10.1016/0022-3115(92)90087-2 PG 30 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JQ092 UT WOS:A1992JQ09200018 ER PT J AU OVERSBY, VM PHINNEY, DL AF OVERSBY, VM PHINNEY, DL TI THE DEVELOPMENT OF SURFACE ALTERATION LAYERS ON SRL-165 NUCLEAR WASTE GLASSES SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID SILICATE-GLASSES; DISSOLUTION; WATER AB A series of experiments were conducted to investigate the rate of formation of reaction layers on samples of simulated SRL-165 nuclear waste glass with as-cast surfaces. Reaction times from 1 to 91 days at 90-degrees-C were used with deionized water or sodium silicate solution as the leachant. Results are presented for the leaching solutions at the end of the reaction periods as well as for the chemical composition of the reaction layer developed on the glass. Layers developed in silicate solution were thin, simple in structure, and very reproducible from place to place on the same sample and between samples reacted for the same time period. In contrast, layers developed in deionized water were complicated in structure and showed extreme variability even within a single sample. Mass-balance calculations show that dissolution of the glass continues even though the alteration layer adheres firmly to the glass. RP OVERSBY, VM (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 17 TC 3 Z9 3 U1 0 U2 2 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 AUG PY 1992 VL 190 BP 247 EP 268 DI 10.1016/0022-3115(92)90089-4 PG 22 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JQ092 UT WOS:A1992JQ09200020 ER PT J AU MAZER, JJ BATES, JK BRADLEY, CR STEVENSON, CM AF MAZER, JJ BATES, JK BRADLEY, CR STEVENSON, CM TI WATER DIFFUSION IN TEKTITES - AN EXAMPLE OF THE USE OF NATURAL ANALOGS IN EVALUATING THE LONG-TERM REACTION OF GLASS WITH WATER SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID SILICATE-GLASSES; HYDRATION; WASTE; DISSOLUTION; TEMPERATURE; MECHANISMS; CORROSION AB A natural analogue approach is used to relate water diffusion in natural rhyolitic glasses of great age to water diffusion in nuclear waste glasses. Tektites are glasses of excellent durability with approximately 74 Wt% SiO2. They have a resistance to water diffusion similar to that for nuclear waste glasses where the diffusion coefficients are approximately 2 x 10(-24) m2/s at 25-degrees-C. The results of a series of experiments with tektite glass in water vapor atmospheres between 150 and 225-degrees-C for up to 400 days are presented. Water diffusion was found to be the rate-determining process in all experiments. The reaction resulted in the formation of a birefringent hydration layer, that increased in thickness up to 4.8 mum as a function of the square root of time. The temperature dependence of the reaction was quantified, allowing the experimental results to be extrapolated to repository-relevant conditions for nuclear waste glass. These calculations indicate that the water diffusion reaction process is slower than the reaction observed in nuclear waste glass experiments. C1 ARCHAEOL SERV CONSULTANTS,COLUMBUS,OH 43202. RP MAZER, JJ (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 38 TC 3 Z9 3 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD AUG PY 1992 VL 190 BP 277 EP 284 DI 10.1016/0022-3115(92)90091-X PG 8 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JQ092 UT WOS:A1992JQ09200022 ER PT J AU SANDENAW, TA AF SANDENAW, TA TI AN EXPLANATION FOR SIMILARITIES IN PROPERTIES OF ALPHA-PHASE PU AND TINI ALLOYS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID TRANSFORMATION BEHAVIOR; CRYSTAL-STRUCTURES; TI50NI47FE3 ALLOY; PLUTONIUM METAL; DENSITY-WAVE; TRANSITION; RESISTIVITY; DEPENDENCE; MARTENSITE; STATES AB References are reviewed which indicate that there are electronic changes in a-phase Pu at several temperatures below ambient. A published theory suggests that periodic lattice distortions (PLDs) can serve the purpose of promoting electrons into holes in the Fermi surface. Therefore PLDs may be responsible for low-temperature Pu metal behavior. Prior publications have shown that there are two modes of electrical conductivity in alpha-phase Pu. One mode gives a temperature-independent electrical resistivity along the b axis above 125 K. The other mode results in a maximum in electrical resistivity at approximately 100 K, which is seen in measurements parallel to the a-c plane. A positron annihilation experiment has suggested that conduction electron populations may remain nearly the same in all Pu metal phases. The latter experiment may explain why electrical resistivity is almost temperature independent in every Pu metal phase above 125 K. Attention is called to similarities in electrical resistivity and magnetic susceptibility behavior of alpha (alpha)-phase Pu and TiNi(X) alloys. Theories are examined which can explain why these materials should have the same low-temperature space group (monoclinic, P2(1)/m), and why they should have PLDs and charge-density-wave (CDW) states. The similarity in the physical properties of alpha-Pu and TiNi alloys may be due to the electronic state of a partially filled or a half-filled band. Both materials may be showing states with characteristics between those of localized core states and weakly correlated valence states. RP SANDENAW, TA (reprint author), LOS ALAMOS NATL LAB,DIV NUCL MAT TECHNOL,LOS ALAMOS,NM 87545, USA. NR 51 TC 1 Z9 1 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD AUG PY 1992 VL 189 IS 3 BP 343 EP 352 DI 10.1016/0022-3115(92)90387-Z PG 10 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JP465 UT WOS:A1992JP46500007 ER PT J AU BLANK, ML CRESS, EA SMITH, ZL SNYDER, F AF BLANK, ML CRESS, EA SMITH, ZL SNYDER, F TI MEATS AND FISH CONSUMED IN THE AMERICAN DIET CONTAIN SUBSTANTIAL AMOUNTS OF ETHER-LINKED PHOSPHOLIPIDS SO JOURNAL OF NUTRITION LA English DT Article DE PLASMALOGENS; DIETARY GLYCERYLETHERS; POLYUNSATURATED FATTY ACIDS; ETHER-CONTAINING PHOSPHOLIPIDS; EDIBLE ANIMAL TISSUES ID PLATELET-ACTIVATING-FACTOR; PERFORMANCE LIQUID-CHROMATOGRAPHY; LIPIDS AB The primary goal of this study was to determine the amounts of ether-containing phospholipids, along with their concentration of certain polyunsaturated acyl groups, from selected, commonly consumed foods of animal origin (salmon, catfish, pork, beef, turkey and chicken). Levels of ether-linked glycerolipids in the samples were of particular interest, because ingestion of ether lipids could contribute to the production of platelet-activating factor (PAF; 1-alkyl-2-acetyl-sn-glycero-3-phosphocholine), one of the most potent biological mediators known. Alkylacyl-sn-glycero-3-phosphocholine was found in all of the meats, with pork loin having the highest levels (0.9-mu-mol/g tissue) and chicken breasts the lowest (0.1-mu-mol/g tissue). Although choline plasmalogens were not as evident as the ubiquitous ethanolamine plasmalogens, substantial amounts (1.0-mu-mol/g tissue) of alk-1-enylacyl-sn-glycero-3-phosphocholine were found in tissues from beef and turkey. Triacylglycerols contained greater proportions of saturated fatty acids than phospholipids, and the ether-linked phospholipids were generally more unsaturated than diacyl species of the same phospholipid. Our data indicate that in addition to the phospholipid fraction of commonly eaten animal tissues supplying substantial amounts of polyunsaturated fatty acids, they are also a rich source of ether-linked lipids. Dietary ether-linked phospholipids could influence the lipid composition of host tissues to the extent that biological responses produced by ether lipid mediators would be affected. C1 OAK RIDGE ASSOCIATED UNIV,DIV MED SCI,OAK RIDGE,TN 37831. FU NIDDK NIH HHS [R01 DK42804-01A1] NR 15 TC 57 Z9 58 U1 1 U2 2 PU AMER INST NUTRITION PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-3166 J9 J NUTR JI J. Nutr. PD AUG PY 1992 VL 122 IS 8 BP 1656 EP 1661 PG 6 WC Nutrition & Dietetics SC Nutrition & Dietetics GA JE883 UT WOS:A1992JE88300008 PM 1640259 ER PT J AU TRAHANOVSKY, WS KOEPLINGER, KA AF TRAHANOVSKY, WS KOEPLINGER, KA TI SYNTHESIS AND DIMERIZATION OF 2 CROSS-CONJUGATED TRIENES - 3-METHYLENE-1,4-PENTADIENE AND 1,2,3-TRIMETHYLENECYCLOHEXANE SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Article ID FLASH VACUUM PYROLYSIS; ORTHO-QUINODIMETHANES; GENERATION; INDOLE-2,3-QUINODIMETHANES; ISOMERIZATION; REACTIVITY; MECHANISM; BUTADIENE; RADICALS AB 3-Methylene-1,4-pentadiene (8) and 1,2,3-trimethylenecyclohexane (10) are prepared in moderate to high yields in good purity by the flash vacuum pyrolysis of 1,5-diacetoxy-3-(acetoxymethyl)pentane (12) and 1,2,3-tris(acetoxymethyl)cyclohexane (17), respectively. Triene 8 dimerizes cleanly at a moderate rate in benzene at 95-degrees-C to give only one major product, [4 + 2] dimer 1,4,4-trivinylcyclohexene (13). Triene 10, the conformationally restricted all cisoid analog of 8, dimerizes more rapidly in benzene at 95-degrees-C to give only one major dimer, a [4 + 2] dimer (21). It is concluded that the dimerization proceeds by a two-step mechanism: rate-determining attack at the middle methylene group to form a resonance-stabilized diradical intermediate followed by rapid closure of the diradical to give a [4 + 2] dimer. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP TRAHANOVSKY, WS (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 48 TC 21 Z9 21 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3263 J9 J ORG CHEM JI J. Org. Chem. PD AUG PY 1992 VL 57 IS 17 BP 4711 EP 4716 DI 10.1021/jo00043a032 PG 6 WC Chemistry, Organic SC Chemistry GA JJ668 UT WOS:A1992JJ66800032 ER PT J AU CAHEN, D NOUFI, R AF CAHEN, D NOUFI, R TI FREE-ENERGIES AND ENTHALPIES OF POSSIBLE GAS-PHASE AND SURFACE-REACTIONS FOR PREPARATION OF CUINSE2 SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE CUINSE2; CUGASE2; HEAT FORMATION; GIBBS FREE ENERGY; ENTHALPY; SYNTHESIS CONTROL ID PHOTOELECTROCHEMICAL CELLS; SINGLE-CRYSTALS; SOLAR-CELLS; SEMICONDUCTORS; STABILITY; GROWTH AB On the basis of literature data of thermodynamic quantities and functions for species that can be involved in the preparation of thin films of CuInSe2, we calculate free energies for a number of possible reactions. The reactions that are considered are especially relevant for the three-source vacuum evaporation process and for selenization of Culn alloys. Reactions of species that can be present in the gas phase, with oxygen, are also considered. Where possible, free energies of reaction are calculated at temperatures relevant for these preparation processes. In some cases, only enthalpies of reaction could be given. We include a compilation of free energies and enthalpies of formation for I-III-VI2 compounds and related binary chalcogenides. This can help future calculations of the type presented here for other I-III-VI2 compounds. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP CAHEN, D (reprint author), WEIZMANN INST SCI,IL-76100 REHOVOT,ISRAEL. NR 36 TC 56 Z9 56 U1 2 U2 11 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 AUG PY 1992 VL 53 IS 8 BP 991 EP 1005 DI 10.1016/0022-3697(92)90068-O PG 15 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA JF950 UT WOS:A1992JF95000001 ER PT J AU SINATKAS, J SKOURAS, LD STROTTMAN, D VERGADOS, JD AF SINATKAS, J SKOURAS, LD STROTTMAN, D VERGADOS, JD TI SHELL-MODEL CALCULATIONS IN THE A = 80-100 MASS REGION .1. A STUDY OF THE N = 50 NUCLEI SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article ID MATRIX-ELEMENTS; ISOTONES; NEUTRON; SN-100 AB The structure of the N = 50 and Z < 50 nuclei is examined in a model space consisting of the 0g9/2, 1p1/2, 1p3/2 and the 0f5/2 proton-hole orbitals outside the doubly dosed Sn-100(50) core. The effective two-body interaction and the effective one-body transition operators for this model space are derived by introducing second-order corrections to the Sussex matrix elements, while the one-hole energies are deduced by a least-squares fit to the observed levels. The results of the calculation are found to be in very satisfactory agreement with experiment for all nuclei with 38 < Z less-than-or-equal-to 46 but for Z less-than-or-equal-to 38 this agreement begins to deteriorate rapidly. Such a feature possibly indicates the appearance of deformation and the breaking of the N = 50 core. C1 UNIV IOANNINA,DEPT PHYS,GR-45338 IOANNINA,GREECE. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP SINATKAS, J (reprint author), NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. NR 49 TC 87 Z9 87 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 1992 VL 18 IS 8 BP 1377 EP 1400 DI 10.1088/0954-3899/18/8/012 PG 24 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA JG801 UT WOS:A1992JG80100012 ER PT J AU SINATKAS, J SKOURAS, LD STROTTMAN, D VERGADOS, JD AF SINATKAS, J SKOURAS, LD STROTTMAN, D VERGADOS, JD TI SHELL-MODEL CALCULATIONS IN THE A = 80-100 MASS REGION .2. A STUDY OF THE N = 49, 48 NUCLEI SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article ID BETA-DECAY AB The structure of the 38 less-than-or-equal-to Z less-than-or-equal-to 44 and N = 49, 48 nuclei is examined by considering the doubly closed Sn-100(50) as a core and placing proton and neutron holes in the 0g9/2, 1p1/2, 1p3/2 and the 0f5/2 orbitals. The effective interaction for this model space has been derived by introducing second-order corrections to the Sussex matrix elements, while the one-hole energies have been deduced by a least-squares fit to the observed levels. It is found that agreement with experiment can be improved by introducing three parameters which modify the strength of some T = 0 matrix elements. The results of the calculation are found, generally, to be in satisfactory agreement with experiment for most nuclei examined. However, as in the case of the N = 50 nuclei, there are indications that configurations outside the model space begin to influence the low-lying spectra of the N = 49, 48 nuclei as the number of valence holes increases. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV IOANNINA,DEPT PHYS,IOANNINA,GREECE. RP SINATKAS, J (reprint author), NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. NR 24 TC 50 Z9 50 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD AUG PY 1992 VL 18 IS 8 BP 1401 EP 1418 DI 10.1088/0954-3899/18/8/013 PG 18 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA JG801 UT WOS:A1992JG80100013 ER PT J AU LARSSON, J AF LARSSON, J TI AN ACTION PRINCIPLE FOR THE VLASOV EQUATION AND ASSOCIATED LIE PERTURBATION EQUATIONS .1. THE VLASOV-POISSON SYSTEM SO JOURNAL OF PLASMA PHYSICS LA English DT Article ID GUIDING CENTER THEORIES; MAXWELL-VLASOV; CONSERVATION-LAWS; PLASMA AB A new action principle determining the dynamics of the Vlasov-Poisson system is presented (the Vlasov-Maxwell system will be considered in Part 2). The particle distribution function is explicitly a field to be varied in the action principle, in which only fundamentally Eulerian variables and fields appear. The Euler-Lagrange equations contain not only the Vlasov-Poisson system but also equations associated with a Lie perturbation calculation on the Vlasov equation. These equations greatly simplify the extensive algebra in the small-amplitude expansion. As an example, a general, manifestly Manley-Rowe-symmetric, expression for resonant three-wave interaction is derived. The new action principle seems ideally suited for the derivation of action principles for reduced dynamics by the use of various averaging transformations (such as guiding-centre, oscillation-centre or gyro-centre transformations). It is also a powerful starting point for the application of field-theoretical methods. For example, the recently found Hermitian structure of the linearized equations is given a very simple and instructive derivation, and so is the well-known Hamiltonian bracket structure of the Vlasov-Poisson system. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP LARSSON, J (reprint author), UMEA UNIV,DEPT PLASMA PHYS,S-90187 UMEA,SWEDEN. NR 29 TC 13 Z9 13 U1 0 U2 6 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0022-3778 J9 J PLASMA PHYS JI J. Plasma Phys. PD AUG PY 1992 VL 48 BP 13 EP 35 PN 1 PG 23 WC Physics, Fluids & Plasmas SC Physics GA JR971 UT WOS:A1992JR97100002 ER PT J AU CHEN, JS MCLARNON, FR CAIRNS, EJ AF CHEN, JS MCLARNON, FR CAIRNS, EJ TI INVESTIGATION OF LOW-ZINC-SOLUBILITY ELECTRODES AND ELECTROLYTES IN ZINC SILVER-OXIDE CELLS SO JOURNAL OF POWER SOURCES LA English DT Article ID KOH CONCENTRATION AB The cycle-life performance of the Zn/AgO cell is limited by high rates of Zn active material redistribution (shape change) and Zn dendrite growth. Reduced-zinc-solubility electrolytes, prepared by adding F-, CO32-, BO33- and PO43- salts to aqueous KOH solutions, were used in 5 A h Zn/AgO cells to determine their effect on cell lifetimes. Ca(OH)2 additions to the Zn electrode were also evaluated in cells of the same capacity and mass as the calcium-free cells. It was found that all of the anion additives to KOH electrolytes resulted in lower cell capacities and shorter lifetimes, which could be attributed the formation of soluble Ag-containing salts and subsequent degradation of the Ag electrode performance. The calcium-containing Zn electrode was found to significantly improve the performance of the Zn/AgO cell by promoting higher capacities, especially over the initial 20 cycles. The higher capacities could be attributed to the formation of a calcium zincate complex, crystals of which were found in the cycled Zn electrodes. C1 UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. RI Cairns, Elton/E-8873-2012 OI Cairns, Elton/0000-0002-1179-7591 NR 12 TC 6 Z9 12 U1 1 U2 8 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 AUG PY 1992 VL 39 IS 3 BP 333 EP 348 DI 10.1016/0378-7753(92)80006-W PG 16 WC Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Energy & Fuels; Materials Science GA JP173 UT WOS:A1992JP17300006 ER PT J AU PENNELL, WE AF PENNELL, WE TI HEAVY-SECTION STEEL TECHNOLOGY PROGRAM - FRACTURE ISSUES SO JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article AB Large-scale fracture mechanics tests have resulted in the identification of a number of fracture technology issues. Identification of additional issues has come from the reactor vessel materials irradiation test program and from reactor operating experience. This paper provides a review of fracture issues with an emphasis on their potential impact on a reactor vessel pressurized thermal shock (PTS) analysis. Mixed mode crack propagation emerges as a major issue, due in large measure to the poor performance of existing models for the prediction of ductile tearing. Rectification of ductile tearing technology deficiencies may require extending the technology to include a more complete treatment of stress state and loading history effects. The effect of cladding on vessel fracture remains uncertain to the point that it is not possible to determine at this time if the net effect will be positive or negative. Enhanced fracture toughness for shallow flaws has been demonstrated for low-strength structural steels. Demonstration of a similar effect in reactor pressure vessel steels could have a significant beneficial effect on the probabilistic analysis of reactor vessel fracture. Further development of existing fracture mechanics models and concepts is required to meet the special requirements for fracture evaluation of circumferential flaws in the welds of ring-forged vessels. Fracture technology advances required to address the issues discussed in this paper are the major objective for the ongoing Heavy Section Steel Technology (HSST) program at ORNL. RP PENNELL, WE (reprint author), OAK RIDGE NATL LAB,DIV ENGN TECHNOL,OAK RIDGE,TN 37831, USA. NR 23 TC 3 Z9 3 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0094-9930 J9 J PRESS VESS-T ASME JI J. Press. Vessel Technol.-Trans. ASME PD AUG PY 1992 VL 114 IS 3 BP 255 EP 264 DI 10.1115/1.2929039 PG 10 WC Engineering, Mechanical SC Engineering GA JK889 UT WOS:A1992JK88900001 ER PT J AU MATTHEWS, SM BOEGEL, AJ ECCLES, SF HOMANN, SG RICE, DW LOFTIS, JA JOVANOVICH, MC CAUFIELD, RA MINCHER, BJ MEIKRANTZ, DH MURPHY, RJ GRESHAM, GL CONNOLY, MJ AF MATTHEWS, SM BOEGEL, AJ ECCLES, SF HOMANN, SG RICE, DW LOFTIS, JA JOVANOVICH, MC CAUFIELD, RA MINCHER, BJ MEIKRANTZ, DH MURPHY, RJ GRESHAM, GL CONNOLY, MJ TI HIGH-ENERGY IRRADIATION OF CHLORINATED HYDROCARBONS SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Article ID DECHLORINATION; RADIATION AB The Lawrence Livermore National Laboratory (LLNL) and the Idaho National Engineering Laboratory (INEL) are jointly investigating the decomposition of chlorinated hydrocarbons using bremsstrahlung radiation produced by electron accelerators and gamma photons from spent reactor fuel. Experimental results demonstrate an exponential type decay of concentration with dose for volatile organic compounds (VOCs) in ground water and for both polychlorinated biphenyis (PCBs) and insecticides in organic solutions. Experiments were performed al several photon energies and dose rates with various initial concentrations. Mass balance analysis suggests complete mineralization of VOCs in ground water and indicates significant degradation of PCBs and insecticides to VOC type compounds in organic solutions. C1 IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. RP MATTHEWS, SM (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,MAIL CODE L-629,LIVERMORE,CA 94550, USA. RI Mincher, Bruce/C-7758-2017 NR 3 TC 7 Z9 8 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 AUG PY 1992 VL 161 IS 1 BP 253 EP 264 DI 10.1007/BF02034899 PG 12 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA JP684 UT WOS:A1992JP68400026 ER PT J AU THOMAS, DM COTTER, JM HOLFORD, D AF THOMAS, DM COTTER, JM HOLFORD, D TI EXPERIMENTAL-DESIGN FOR SOIL GAS RADON MONITORING SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL CONF ON METHODS AND APPLICATIONS OF RADIOANALYTIC CHEMISTRY ( MARC-II ) CY APR 21-27, 1991 CL KONA, HI SP AMER NUCL SOC ID GROUNDWATER AB An effort to define and characterize the environmental effects that control the release and mobility of radon in the environment is presented. The results of our preliminary field experiments on the long-term study of our radon activity measurements are reported. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP THOMAS, DM (reprint author), HAWAII INST GEOPHYS, 2525 CORREA RD, HONOLULU, HI 96822 USA. NR 16 TC 21 Z9 21 U1 1 U2 2 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 AUG PY 1992 VL 161 IS 2 BP 313 EP 323 DI 10.1007/BF02040478 PG 11 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA JP687 UT WOS:A1992JP68700002 ER PT J AU SURANO, KA HUDSON, GB FAILOR, RA SIMS, JM HOLLAND, RC MACLEAN, SC GARRISON, JC AF SURANO, KA HUDSON, GB FAILOR, RA SIMS, JM HOLLAND, RC MACLEAN, SC GARRISON, JC TI HELIUIM-3 MASS-SPECTROMETRY FOR LOW-LEVEL TRITIUM ANALYSIS OF ENVIRONMENTAL-SAMPLES SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL CONF ON METHODS AND APPLICATIONS OF RADIOANALYTIC CHEMISTRY ( MARC-II ) CY APR 21-27, 1991 CL KONA, HI SP AMER NUCL SOC AB Helium-3 (He-3) mass spectrometry for the analysis of low-level tritium (H-3) concentrations (0.5 to 5 Bq . l-1) in environmental sample matrices was compared with conventional low-level beta-decay counting methods. The mass-spectrometiry method compared favorably, equalling or surpassing conventional decay-counting methods with respect to most criteria. Additional research and method refinements may make He-3 mass spectrometry the method of choice for routine, low-level to very-low-level (L < 0.5 Bq . l-1) H-3 measurements in a wide variety of environmental samples in the future. C1 LAWRENCE LIVERMORE NATL LAB,DIV NUCL CHEM,LIVERMORE,CA 94551. LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94551. RP SURANO, KA (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT ENVIRONM PROTECT,POB 808,LIVERMORE,CA 94551, USA. NR 8 TC 22 Z9 23 U1 0 U2 1 PU AKADEMIAI KIADO PI BUDAPEST PA PO BOX 245, H-1519 BUDAPEST, HUNGARY SN 0236-5731 J9 J RADIOAN NUCL CH AR JI J. Radioanal. Nucl. Chem.-Artic. PD AUG PY 1992 VL 161 IS 2 BP 443 EP 453 DI 10.1007/BF02040491 PG 11 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA JP687 UT WOS:A1992JP68700015 ER PT J AU GRANT, PM ROBOUCH, P TORRES, RA SILVA, RJ AF GRANT, PM ROBOUCH, P TORRES, RA SILVA, RJ TI HIGH-TEMPERATURE SPECTROSCOPY FOR NUCLEAR WASTE APPLICATIONS SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL CONF ON METHODS AND APPLICATIONS OF RADIOANALYTIC CHEMISTRY ( MARC-II ) CY APR 21-27, 1991 CL KONA, HI SP AMER NUCL SOC ID NIR SPECTROSCOPY AB Instrumentation has been developed to perform uv-vis-nir absorbance measurements remotely and at elevated temperatures and pressures. Fiber-optic spectroscopy permits the interrogation of radioactive species within a glovebox enclosure at temperatures ranging from ambient to > 100-degrees-C. Spectral shifts as a function of metal-ligand coordination are used to compute thermodynamic free energies of reaction by matrix regression analysis. Pr3+ serves as a convenient analog for trivalent actinides without attendant radioactivity hazards, and recent results obtained from 20-95-degrees-C with the Pr-acetate complexation system are presented. Preliminary experimentation on Am(III) hydrolysis is also described. RP GRANT, PM (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV NUCL CHEM L234,LIVERMORE,CA 94550, USA. NR 16 TC 2 Z9 2 U1 1 U2 1 PU AKADEMIAI KIADO PI BUDAPEST PA PO BOX 245, H-1519 BUDAPEST, HUNGARY SN 0236-5731 J9 J RADIOAN NUCL CH AR JI J. Radioanal. Nucl. Chem.-Artic. PD AUG PY 1992 VL 161 IS 2 BP 527 EP 532 DI 10.1007/BF02040499 PG 6 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA JP687 UT WOS:A1992JP68700023 ER PT J AU MAITI, TC KAYE, JH KOZELISKY, AE AF MAITI, TC KAYE, JH KOZELISKY, AE TI SEQUENTIAL SEPARATION OF PU, NP, U AND AM FROM HIGHLY RADIOACTIVE HANDFORD WASTE BY ION-EXCHANGE METHODS SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL CONF ON METHODS AND APPLICATIONS OF RADIOANALYTIC CHEMISTRY ( MARC-II ) CY APR 21-27, 1991 CL KONA, HI SP AMER NUCL SOC AB A simple, rapid method has been developed for the sequential separation of actinide elements from samples with high salt content such as those resulting from efforts to characterize Hanford storage tank waste. Actinides in 9M HCl solution are introduced into an anion exchange column. U(VI), Np(IV) and Pu(IV) are retained on the column while Am(III) passes through. Plutonium is eluted first, reductively; after which neptunium and then uranium are eluted with mixtures of HCl and HF. The Am(III) is purified by cation exchange in a nitric acid system. RP MAITI, TC (reprint author), PACIFIC NW LAB, DIV NUCL CHEM, MS P7-07,POB 999, RICHLAND, WA 99352 USA. NR 14 TC 4 Z9 4 U1 1 U2 6 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 AUG PY 1992 VL 161 IS 2 BP 533 EP 540 DI 10.1007/BF02040500 PG 8 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA JP687 UT WOS:A1992JP68700024 ER PT J AU HORWITZ, EP DIETZ, ML CHIARIZIA, R AF HORWITZ, EP DIETZ, ML CHIARIZIA, R TI THE APPLICATION OF NOVEL EXTRACTION CHROMATOGRAPHIC MATERIALS TO THE CHARACTERIZATION OF RADIOACTIVE-WASTE SOLUTIONS SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL CONF ON METHODS AND APPLICATIONS OF RADIOANALYTIC CHEMISTRY ( MARC-II ) CY APR 21-27, 1991 CL KONA, HI SP AMER NUCL SOC ID SEPARATION AB A simple method for the separation and preconcentration of radio strontium from acidic nuclear waste solutions for subsequent determination is described. The method involves passage of the waste solution, acidified to at least 2M with nitric acid, through an extraction chromatographic column consisting of a 1M solution of bis-4,4'(5')[(t-butyl)cyclohexano]-18-crown-6 in 1-octanol sorbed on an inert polymeric substrate, which preferentially retains strontium. The strontium may then be stripped from the column with a small volume of either dilute (less-than-or-equal-to 0.05M) nitric acid or water. Actinides present are removed quantitatively prior to strontium separation by passage of the sample through an actinide-specific extraction chromatographic column. C1 EICHROM IND INC,DARIEN,IL 60559. RP HORWITZ, EP (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 12 TC 56 Z9 58 U1 0 U2 9 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 AUG PY 1992 VL 161 IS 2 BP 575 EP 583 DI 10.1007/BF02040504 PG 9 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA JP687 UT WOS:A1992JP68700028 ER PT J AU ROBERTSON, D HAGGARD, D THOMAS, C WYNHOFF, N AF ROBERTSON, D HAGGARD, D THOMAS, C WYNHOFF, N TI RADIOLOGICAL CHARACTERIZATION OF NEUTRON-ACTIVATED METAL WASTES FROM NUCLEAR-POWER STATIONS SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL CONF ON METHODS AND APPLICATIONS OF RADIOANALYTIC CHEMISTRY ( MARC-II ) CY APR 21-27, 1991 CL KONA, HI SP AMER NUCL SOC AB Three different methods for determining the long-lived radionuclide contents of highly neutron activated metal wastes are being compared and assessed using samples of pressurized-water reactor (PWR) and boiling-water reactor (BWR) spent fuel disassembly hardware and control rods. These methods include: 1) empirical analyses involving sampling and laboratory measurements; 2) direct assay techniques; 3) calculation methods. These techniques are discussed and the results of the comparisons made to date are presented. The agreement between empirical versus calculational methods for the disassembly hardware was generally within 10% to 50%, and rarely exceeded a factor of 2.5, especially near the fueled region of the reactor core. However, large discrepancies between the measured versus calculated concentrations were observed for Ni-59 and Ni-63 at the end fittings of the fuel assembly hardware, where the calculations underestimated the concentrations by factors varying from about 8 to 28. The calculation errors are believed to be due to inadequate cross section data for the nickel isotopes. RP ROBERTSON, D (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 5 TC 0 Z9 0 U1 1 U2 2 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 AUG PY 1992 VL 161 IS 2 BP 585 EP 595 DI 10.1007/BF02040505 PG 11 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA JP687 UT WOS:A1992JP68700029 ER PT J AU MULLICA, DF SAPPENFIELD, EL BOATNER, LA AF MULLICA, DF SAPPENFIELD, EL BOATNER, LA TI SINGLE-CRYSTAL ANALYSIS OF MIXED (LN/TBPO4) ORTHOPHOSPHATES SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article ID LANTHANIDE ORTHO-PHOSPHATES C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP MULLICA, DF (reprint author), BAYLOR UNIV,DEPT CHEM,WACO,TX 76798, USA. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 21 TC 13 Z9 13 U1 1 U2 4 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD AUG PY 1992 VL 99 IS 2 BP 313 EP 318 DI 10.1016/0022-4596(92)90319-Q PG 6 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA JH126 UT WOS:A1992JH12600012 ER PT J AU HOLMES, HF MESMER, RE AF HOLMES, HF MESMER, RE TI MIXING EFFECTS IN AQUEOUS-SOLUTIONS AT ELEVATED-TEMPERATURES SO JOURNAL OF SOLUTION CHEMISTRY LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON CHEMISTRY IN HIGH TEMPERATURE AQUEOUS SOLUTIONS CY AUG 19-22, 1991 CL PROVO, UT SP BRIGHAM YOUNG UNIV, ELECT POWER RES INST, HART SCI, TRONAC DE ELECTROLYTE MIXTURES; ISOPIESTIC; HIGH TEMPERATURE; MODELS; ION-INTERACTION MODEL; OSMOTIC COEFFICIENT; ACTIVITY COEFFICIENT ID SODIUM-CHLORIDE SOLUTIONS; RECIPROCAL SALT SYSTEMS; THERMODYNAMIC PROPERTIES; ACTIVITY-COEFFICIENTS; OSMOTIC COEFFICIENTS; ISOPIESTIC DETERMINATION; STRONG ELECTROLYTES; MIXTURES; 100.3-DEGREES-C; 250-DEGREES-C AB With few exceptions, the systematics and predictions of mixing effects in the thermodynamics of aqueous electrolyte solutions are not well established, particularly at high temperatures. The most useful general method for studying the excess Gibbs energy of mixed electrolyte solutions is the isopiestic technique but some calorimetric methods have desirable advantages provided suitable reference data are available. Currently, the most useful description of mixed electrolyte systems is the ion-interaction treatment of Pitzer. Relationships between various models used for mixtures and their advantages and disadvantages are discussed. According to the ion- interaction model mixing contributions have their largest effect for equimolar mixtures in the case of the osmotic coefficient and for trace components in the case of activity coefficients. Various types are illustrated with examples primarily from high-temperature studies at ORNL. RP HOLMES, HF (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831, USA. NR 42 TC 2 Z9 2 U1 1 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0095-9782 J9 J SOLUTION CHEM JI J. Solut. Chem. PD AUG PY 1992 VL 21 IS 8 BP 713 EP 724 DI 10.1007/BF00651505 PG 12 WC Chemistry, Physical SC Chemistry GA JJ973 UT WOS:A1992JJ97300002 ER PT J AU MESMER, RE HOLMES, HF AF MESMER, RE HOLMES, HF TI PH, DEFINITION AND MEASUREMENT AT HIGH-TEMPERATURES SO JOURNAL OF SOLUTION CHEMISTRY LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON CHEMISTRY IN HIGH TEMPERATURE AQUEOUS SOLUTIONS CY AUG 19-22, 1991 CL PROVO, UT SP BRIGHAM YOUNG UNIV, ELECT POWER RES INST, HART SCI, TRONAC DE PH; ACIDITY; LIQUID JUNCTION POTENTIALS; ACTIVITY COEFFICIENTS; HIGH TEMPERATURES; ION ASSOCIATION; ION-INTERACTION PARAMETERS; ELECTROLYTE MIXTURES ID ACID ASSOCIATION QUOTIENTS; SODIUM-CHLORIDE SOLUTIONS; THERMODYNAMIC PROPERTIES; MEDIA; ELECTROLYTES; ION AB In this review paper, the NBS scale and its limitations are briefly discussed. The magnitude of liquid junction potentials and some calculated values are presented. The use of a molality scale for hydrogen electrode concentration cells at high temperatures is described, and results from measurements on ionization equilibria are summarized. Use of this scale is also recommended for certain circumstances with cells without liquid junction. As an alternative activity scale, use of the Pitzer ion- interaction treatment for ions is recommended for special cases. Finally, reference data are presented for gamma(+/- HCl) in HCl(aq) to 350-degrees-C and (HCl + NaCl)(aq) to 200-degrees-C that were derived by use of the Pitzer ion-interaction treatment. RP MESMER, RE (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831, USA. NR 44 TC 38 Z9 39 U1 0 U2 8 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0095-9782 J9 J SOLUTION CHEM JI J. Solut. Chem. PD AUG PY 1992 VL 21 IS 8 BP 725 EP 744 DI 10.1007/BF00651506 PG 20 WC Chemistry, Physical SC Chemistry GA JJ973 UT WOS:A1992JJ97300003 ER PT J AU KETTLER, RM WESOLOWSKI, DJ PALMER, DA AF KETTLER, RM WESOLOWSKI, DJ PALMER, DA TI DISSOCIATION QUOTIENTS OF MALONIC-ACID IN AQUEOUS SODIUM-CHLORIDE MEDIA TO 100-DEGREES-C SO JOURNAL OF SOLUTION CHEMISTRY LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL SYMP ON CHEMISTRY IN HIGH TEMPERATURE AQUEOUS SOLUTIONS CY AUG 19-22, 1991 CL PROVO, UT SP BRIGHAM YOUNG UNIV, ELECT POWER RES INST, HART SCI, TRONAC DE MALONIC ACID; PROPANEDIOIC ACID; DISSOCIATION CONSTANTS; THERMODYNAMICS; POTENTIOMETRY; IONIC STRENGTH ID ORGANIC-ACIDS; NACL MEDIA; IONIZATION; 175-DEGREES-C; 250-DEGREES-C; HYDROLYSIS; ALUMINUM; WATER; SOIL; ION AB The first and second molal dissociation quotients of malonic acid were measured potentiometrically in a concentration cell fitted with hydrogen electrodes. The hydrogen ion molality of malonic acid/bimalonate solutions was measured relative to a standard aqueous HCl solution from 0 to 100-degrees-C over 25-degrees intervals at five ionic strengths ranging from 0.1 to 5.0 molal (NaCl). The molal dissociation quotients and available literature data were treated in the all anionic form by a seven-term equation. This treatment yielded the following thermodynamic quantities for the first acid dissociation equilibrium at 25-degrees-C: log K1a = -2.852+/-0.003, DELTA-H1a-degrees = 0.1+/-0.3 kJ-mol-1, DELTA-S1a-degrees, = -54.4+/-1.0 J-mol-1-K-1, and DELTA-C(p,1a)-degrees = -185+/-20 J-mol-1-K-1. Measurements of the bimalonate/malonate system were made over the same intervals of temperature and ionic strength. A similar regression of the present and previously published equilibrium quotients using a seven- term equation yielded the following values for the second acid dissociation equilibrium at 25-degrees-C: log K2a = -5.697+/-0.001, DELTA-H-2a-degrees = -5.13+/-0.11 kJ-mol-1, DELTA-S2a-degrees = -126.3+/-0.4 J-mol-1-K-1, and DELTA-C(p,2a)-degrees = -250+10 J-mol-1-K-1. C1 OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. RP KETTLER, RM (reprint author), UNIV NEBRASKA,DEPT GEOL,LINCOLN,NE 68588, USA. NR 25 TC 28 Z9 29 U1 0 U2 6 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0095-9782 J9 J SOLUTION CHEM JI J. Solut. Chem. PD AUG PY 1992 VL 21 IS 8 BP 883 EP 900 DI 10.1007/BF00651513 PG 18 WC Chemistry, Physical SC Chemistry GA JJ973 UT WOS:A1992JJ97300010 ER PT J AU CHEN, SY WANG, Z SHAN, XW DOOLEN, GD AF CHEN, SY WANG, Z SHAN, XW DOOLEN, GD TI LATTICE BOLTZMANN COMPUTATIONAL FLUID-DYNAMICS IN 3 DIMENSIONS SO JOURNAL OF STATISTICAL PHYSICS LA English DT Article; Proceedings Paper CT NATO ADVANCED RESEARCH WORKSHOP : LATTICE GAS AUTOMATA, THEORY, IMPLEMENTATION, SIMULATIONS CY JUN 25-28, 1991 CL NICE, FRANCE SP NATO DE LATTICE GAS; LATTICE BOLTZMANN; 3-DIMENSIONAL FLOWS; TURBULENCE ID GAS AUTOMATA; EQUATION AB The recent development of the lattice gas method and its extension to the lattice Boltzmann method have provided new computational schemes for fluid dynamics. Both methods are fully paralleled and can easily model many different physical problems, including flows with complicated boundary conditions. In this paper, basic principles of a lattice Boltzmann computational method are described and applied to several three-dimensional benchmark problems. In most previous lattice gas and lattice Boltzmann methods, a face-centered-hypercubic lattice in four-dimensional space was used to obtain an isotropic stress tensor. To conserve computer memory, we develop a model which requires 14 moving directions instead of the usual 24 directions. Lattice Boltzmann models. describing two-phase fluid flows and magnetohydrodynamics, can be developed based on this simpler 14-directional lattice. Comparisons between three-dimensional spectral code results and results using our method are given for simple periodic geometries. An important property of the lattice Boltzmann method is that simulations for flow in simple and complex geometries have the same speed and efficiency, while all other methods. including the spectral method, are unable to model complicated geometries efficiently. C1 UNIV DELAWARE,BARTOL RES INST,NEWARK,DE 19716. DARTMOUTH COLL,DEPT PHYS & ASTRON,HANOVER,NH 03755. RP CHEN, SY (reprint author), LOS ALAMOS NATL LAB,DIV CNLS & THEORET,LOS ALAMOS,NM 87545, USA. RI Chen, Shiyi/A-3234-2010; Shan, Xiaowen/H-2836-2013 OI Shan, Xiaowen/0000-0002-6350-9248 NR 23 TC 171 Z9 174 U1 2 U2 21 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-4715 J9 J STAT PHYS JI J. Stat. Phys. PD AUG PY 1992 VL 68 IS 3-4 BP 379 EP 400 DI 10.1007/BF01341754 PG 22 WC Physics, Mathematical SC Physics GA JG949 UT WOS:A1992JG94900003 ER PT J AU CHEN, S MARTINEZ, DO MATTHAEUS, WH CHEN, HD AF CHEN, S MARTINEZ, DO MATTHAEUS, WH CHEN, HD TI MAGNETOHYDRODYNAMICS COMPUTATIONS WITH LATTICE GAS AUTOMATA SO JOURNAL OF STATISTICAL PHYSICS LA English DT Article; Proceedings Paper CT NATO ADVANCED RESEARCH WORKSHOP : LATTICE GAS AUTOMATA, THEORY, IMPLEMENTATION, SIMULATIONS CY JUN 25-28, 1991 CL NICE, FRANCE SP NATO DE LATTICE GAS; MAGNETOHYDRODYNAMICS; ALFVEN WAVES ID MODEL; HYDRODYNAMICS; FLUIDS AB Lattice gas automata have received considerable interest for the last several years and possibly may become a powerful numerical method for solving various partial differential equations and modeling different physical phenomena, because of their discrete and parallel nature and the capability of handling complicated boundaries. In this paper, we present recent studies on the lattice gas model for magnetohydrodynamics. The FHP-type lattice gas model has been extended to include a bidirectional random walk process, which allows well-defined statistical quantities, such as velocity and magnetic field, to be computed from the microscopic particle representation. The model incorporates a new sequential particle collision method to increase the range of useful Reynolds numbers in the model, an improvement that may also be of use in other lattice gas models. In the context of a Chapman-Enskog expansion, the model approximates the incompressible magnetic hydrodynamic equations in the limit of low Mach number and high-beta. Simulation results presented here demonstrate the validity of the model for several basic problems, including sound wave and Alfven wave propagation, and diffusive Kolmogoroff-type flows. C1 LOS ALAMOS NATL LAB,CNLS,LOS ALAMOS,NM 87545. DARTMOUTH COLL,DEPT PHYS,HANOVER,NH 03755. RP CHEN, S (reprint author), UNIV DELAWARE,BARTOL RES INST,NEWARK,DE 19716, USA. RI Chen, Shiyi/A-3234-2010 NR 19 TC 11 Z9 11 U1 1 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-4715 J9 J STAT PHYS JI J. Stat. Phys. PD AUG PY 1992 VL 68 IS 3-4 BP 533 EP 556 DI 10.1007/BF01341761 PG 24 WC Physics, Mathematical SC Physics GA JG949 UT WOS:A1992JG94900010 ER PT J AU HASSLACHER, B MEYER, DA AF HASSLACHER, B MEYER, DA TI LATTICE GASES AND EXACTLY SOLVABLE MODELS SO JOURNAL OF STATISTICAL PHYSICS LA English DT Article; Proceedings Paper CT NATO ADVANCED RESEARCH WORKSHOP : LATTICE GAS AUTOMATA, THEORY, IMPLEMENTATION, SIMULATIONS CY JUN 25-28, 1991 CL NICE, FRANCE SP NATO DE LATTICE GASES; SPACETIME LATTICE; SPURIOUS CONSERVED QUANTITIES; SOLVABLE MODELS; YANG-BAXTER EQUATION; DISORDER SOLUTIONS; THERMODYNAMIC EQUILIBRIUM ID PROBABILISTIC CELLULAR AUTOMATA; STATISTICAL-MECHANICS; TETRAHEDRON EQUATIONS; ISING-MODELS; SPIN MODELS; EQUILIBRIUM; DERIVATION AB We detail the construction of a family of lattice gas automata based on a model of 't Hooft, proceeding by use of symmetry principles to define first the kinematics of the model and then the dynamics. A spurious conserved quantity appears; we use it to effect a radical transformation of the model into one whose spacetime configurations are equivalent to the two-dimensional states of an exactly solvable statistical mechanics model, the symmetric eight-vertex model with parameters restricted to a disorder variety. We comment on the implications of this identification for the original lattice gas. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. UNIV CALIF SAN DIEGO,INST PURE & APPL PHYS SCI,LA JOLLA,CA 92093. RP HASSLACHER, B (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. RI Meyer, David/J-5809-2015 OI Meyer, David/0000-0003-4148-5617 NR 42 TC 4 Z9 4 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-4715 J9 J STAT PHYS JI J. Stat. Phys. PD AUG PY 1992 VL 68 IS 3-4 BP 575 EP 590 DI 10.1007/BF01341764 PG 16 WC Physics, Mathematical SC Physics GA JG949 UT WOS:A1992JG94900013 ER PT J AU CLEM, JR COFFEY, MW AF CLEM, JR COFFEY, MW TI EFFECTS OF FLUX FLOW, FLUX PINNING, AND FLUX CREEP UPON THE RF SURFACE IMPEDANCE OF TYPE-II SUPERCONDUCTORS SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE SURFACE IMPEDANCE; COMPLEX PENETRATION DEPTH; FLUX FLOW; FLUX PINNING; FLUX CREEP ID DEPENDENCE AB The presence of vortices is known to have an important effect upon the rf surface impedance Z(s) of type-II superconductors. In this paper we summarize a new theoretical approach that permits the influence of flux flow, flux pinning, and flux creep upon Z(s) = R(s) - iX(s) to be calculated over a wide range of angular frequencies omega, magnetic inductions B, and temperatures T. The normal-fluid excitations and the nonlocality of vortex-generated fields are also accounted for. The physics is conveniently described in terms of a complex penetration depth lambda(omega, B, T), to which the surface impedance is related via Z(s) = -imu0omegalambda(omega, B, T). We limit our attention to the linear response of the superconductor in the low-rf-power regime for which the surface impedance is power-independent. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP CLEM, JR (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 23 TC 27 Z9 27 U1 0 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD AUG PY 1992 VL 5 IS 4 BP 313 EP 318 DI 10.1007/BF00618130 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA JW931 UT WOS:A1992JW93100001 ER PT J AU ANDREONE, A KRESIN, VZ WOLF, SA AF ANDREONE, A KRESIN, VZ WOLF, SA TI 2-GAP SUPERCONDUCTIVITY AND MICROWAVE PROPERTIES OF YBCO SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE YBA2CU3O7-X; CU-O2 PLANES; CU-O CHAINS; INDUCED SUPERCONDUCTIVITY; MICROWAVE LOSSES ID HIGH-TC SUPERCONDUCTORS; PARAMETERS AB The YBaCu3O7-x compound contains two conductive subsystem and as a result displays a two-gap structure. The Cu-O2 planes are characterized by intrinsic pairing, whereas the superconducting state of the Cu-O chains is induced by two different charge-transfer channels (intrinsic proximity effect and phonon-mediated transfer). Oxygen ordering affects the value of the induced energy gap. Such spectrum along with a short coherence length lead to peculiar microwave properties of YBCO thin films. The large residual microwave losses are explained in the framework of the two-gap model. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV NAPOLI FEDERICO 2,DIPARTIMENTO SCI FIS,I-80125 NAPLES,ITALY. RP ANDREONE, A (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Wolf, Stuart/A-7513-2009 NR 17 TC 4 Z9 4 U1 0 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 AUG PY 1992 VL 5 IS 4 BP 339 EP 344 DI 10.1007/BF00618133 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA JW931 UT WOS:A1992JW93100004 ER PT J AU WU, XD FOLTYN, SR MUENCHAUSEN, RE COOKE, DW PIQUE, A KALOKITIS, D PENDRICK, V BELOHOUBEK, E AF WU, XD FOLTYN, SR MUENCHAUSEN, RE COOKE, DW PIQUE, A KALOKITIS, D PENDRICK, V BELOHOUBEK, E TI BUFFER LAYERS FOR HIGH-TC THIN-FILMS ON SAPPHIRE SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE HTSC THIN FILMS; SAPPHIRE; BUFFER LAYERS ID EPITAXIAL MGO BUFFER; LARGE-AREA; Y1BA2CU3O7-X AB Buffer layers of various oxides including CeO2 and yttrium-stabilized zirconia (YSZ) have been deposited on R-plane sapphire. The orientation and crystallinity of the layers were optimized to promote epitaxial growth of YBa2Cu3O7-delta (YBCO) thin films. An ion beam channeling minimum yield of approximately 3% was obtained in the CeO2 layer on sapphire, indicating excellent crystallinity of the buffer layer. Among the buffer materials used, CeO2 was found to be the best one for YBCO thin films on R-plane sapphire. High T(c) and J(c) were obtained in YBCO thin films on sapphire with buffer layers. Surface resistances of the YBCO films were approximately 4 mOMEGA at 77 K and 25 GHz. C1 NEOCERA INC,COLL PK,MD 20742. DAVID SARNOFF RES CTR,PRINCETON,NJ 08543. RP WU, XD (reprint author), LOS ALAMOS NATL LAB,CTR SUPERCOND TECHNOL,LOS ALAMOS,NM 87545, USA. NR 20 TC 29 Z9 29 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 AUG PY 1992 VL 5 IS 4 BP 353 EP 359 DI 10.1007/BF00618135 PG 7 WC Physics, Applied; Physics, Condensed Matter SC Physics GA JW931 UT WOS:A1992JW93100006 ER PT J AU MILLER, D RICHARDS, PL GARRISON, SM NEWMAN, N EOM, CB GEBALLE, TH ETEMAD, S INAM, A VENKATESAN, T MARTENS, JS LEE, WY BOURNE, LC AF MILLER, D RICHARDS, PL GARRISON, SM NEWMAN, N EOM, CB GEBALLE, TH ETEMAD, S INAM, A VENKATESAN, T MARTENS, JS LEE, WY BOURNE, LC TI SUBMILLIMETER AND MICROWAVE RESIDUAL LOSSES IN EPITAXIAL-FILMS OF Y-BA-CU-O AND TL-CA-BA-CU-O SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE SUPERCONDUCTIVITY; AC LOSSES; Y-BA-CU-O; TL-CA-BA-CU-O ID HIGH-TC SUPERCONDUCTORS; YBA2CU3O7-DELTA THIN-FILMS; FAR-INFRARED REFLECTIVITY; SURFACE-RESISTANCE; PENETRATION DEPTH; GRAIN-BOUNDARIES; INSITU; ABSORPTIVITY; CONDUCTIVITY; TEMPERATURES AB We have used a novel bolometric technique and a resonant technique to obtain accurate submillimeter and microwave residual loss data for epitaxial thin films of YBa2Cu3O7, Tl2Ca2Ba2Cu3O10, and Tl2CaBa2Cu2O8. For all films we obtain good agreement between the submillimeter and microwave data, with the residual losses in both the Y-Ba-Cu-O and Tl-Ca-Ba-Cu-O films scaling approximately as frequency squared below approximately 1 THz. We are able to fit the losses in the Y-Ba-Cu-O films to a weakly coupled grain model for the a-b plane conductivity, in good agreement with results from a Kramers-Kronig analysis of the loss data. We observe strong phonon structure in the Tl-Ca-Ba-Cu-O films for frequencies between 2 and 21 THz, and are unable to fit these losses to the simple weakly coupled grain model. This is in strong contrast to the case for other high-T(c) superconductors such as YBa2Cu3O7, where phonon structure observed in ceramic samples is absent in epitaxial oriented films and crystals because of the electronic screening due to the high conductivity of the a-b planes. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. CONDUCTUS INC,SUNNYVALE,CA 94086. STANFORD UNIV,DEPT APPL PHYS,STANFORD,CA 94305. BELL COMMUN RES INC,RED BANK,NJ 07701. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. IBM ALMADEN,SAN JOSE,CA 95120. SUPERCOND TECHNOL,SANTA BARBARA,CA 93111. RP MILLER, D (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Venkatesan, Thirumalai/E-1667-2013; Eom, Chang-Beom/I-5567-2014; Newman, Nathan/E-1466-2011 OI Newman, Nathan/0000-0003-2819-9616 NR 43 TC 9 Z9 9 U1 0 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD AUG PY 1992 VL 5 IS 4 BP 379 EP 388 DI 10.1007/BF00618138 PG 10 WC Physics, Applied; Physics, Condensed Matter SC Physics GA JW931 UT WOS:A1992JW93100009 ER PT J AU COHN, DR HAN, SC WOSKOV, PP ZHOU, BL FERDINAND, A GILES, RH WALDMAN, J COOKE, DW MUENCHAUSEN, RE AF COHN, DR HAN, SC WOSKOV, PP ZHOU, BL FERDINAND, A GILES, RH WALDMAN, J COOKE, DW MUENCHAUSEN, RE TI PRECISION SUBMILLIMETER WAVE LASER REFLECTION MEASUREMENTS OF HIGH-TEMPERATURE SUPERCONDUCTORS SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE SUBMILLIMETER WAVE; LASER; REFLECTION; SURFACE RESISTANCE AB Submillimeter wave laser reflection measurements Of surface resistance can provide improved capability in the combination of sensitivity, spatial resolution, and frequency range. We have made reflectivity measurements on metals at 1630 GHz with an uncertainty of less than 0.3%. This sensitivity corresponds to a measurement sensitivity for surface resistance of 0.3 OMEGA. Assuming an f2 frequency scaling of high-temperature superconductor surface resistance from the microwave to the terahertz frequency range, this sensitivity corresponds to about 1 x 10(-5) OMEGA at 10 GHz.Capability for 10(-7) OMEGA sensitivity could eventually be possible. Preliminary submillimeter wave reflection measurements of a YBCO thin film have been made with a sensitivity of 1%. Submillimeter wave reflectometry can make it possible to determine the spatial dependence of surface resistance in a wide range of material sizes and shapes. The spatial resolution could be on the order of 0.3-0.5 mm. C1 MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139. UNIV MASSACHUSETTS,LOWELL RES FDN,LOWELL,MA 01854. LOS ALAMOS NATL LAB,CTR EXPLORATORY RES & DEV,LOS ALAMOS,NM 87545. RP COHN, DR (reprint author), XSIRIUS SUPERCOND INC,1110 N GLEBE RD,SUITE 620,ARLINGTON,VA 22201, USA. NR 6 TC 1 Z9 1 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 AUG PY 1992 VL 5 IS 4 BP 389 EP 393 DI 10.1007/BF00618139 PG 5 WC Physics, Applied; Physics, Condensed Matter SC Physics GA JW931 UT WOS:A1992JW93100010 ER PT J AU BELOHOUBEK, E DELINGER, E KALOKITIS, D FATHY, A PAGLIONE, R PENDRIK, V BROWN, J PIQUE, A WU, XD GREEN, SM MATHEWS, S EDWARDS, R MATHUR, M VENKATESAN, T AF BELOHOUBEK, E DELINGER, E KALOKITIS, D FATHY, A PAGLIONE, R PENDRIK, V BROWN, J PIQUE, A WU, XD GREEN, SM MATHEWS, S EDWARDS, R MATHUR, M VENKATESAN, T TI ADVANCED HIGH-TEMPERATURE SUPERCONDUCTING COMPONENTS FOR MICROWAVE SYSTEMS SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE HIGH-TEMPERATURE SUPERCONDUCTIVITY; MULTIPLEXER; NARROW-BAND FILTER; CIRCULATOR; HIGH-Q SPIRAL RESONATOR AB The application of high-temperature superconducting thin films to microwave systems is expected to lead to major volume and weight savings as well as improved performance. To take full advantage of the properties that the new materials have to offer and justify the additional cooling equipment that accompanies the introduction of superconductivity, many HTS components will have to be integrated. In this paper some of the key microwave circuits that show great promise in this respect, such as multiplexers, circulators, and very narrowband filters, will be discussed and experimental results presented. C1 NEOCERA INC,COLL PK,MD 20742. LOS ALAMOS NATL LAB,ERDC,LOS ALAMOS,NM 87545. RP BELOHOUBEK, E (reprint author), DAVID SARNOFF RES CTR,PRINCETON,NJ 08543, USA. RI Venkatesan, Thirumalai/E-1667-2013 NR 3 TC 7 Z9 7 U1 0 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 AUG PY 1992 VL 5 IS 4 BP 423 EP 429 DI 10.1007/BF00618143 PG 7 WC Physics, Applied; Physics, Condensed Matter SC Physics GA JW931 UT WOS:A1992JW93100014 ER PT J AU ARENDT, PN COOKE, DW ELLIOTT, NE GRAY, ER HUBBARD, KM PIEL, H SWAIN, GR AF ARENDT, PN COOKE, DW ELLIOTT, NE GRAY, ER HUBBARD, KM PIEL, H SWAIN, GR TI A TL-BASED HIGH-TEMPERATURE SUPERCONDUCTING X-BAND CAVITY SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE HIGH-TEMPERATURE SUPERCONDUCTIVITY; X-BAND CAVITY; TL-BASED SUPERCONDUCTING FILMS; METALLIC SUBSTRATES ID RESONATOR AB A nonplanar X-band cavity amenable to coating with high-temperature superconducting films by conventional physical vapor deposition processes bas been designed, fabricated, and tested. The cavity geometry resembles a symmetric clamshell configuration. It consists of two truncated cones joined at their bases. The specific dimensions of the cavity were calculated using the SUPERFISH computer code. Cavities were constructed using a silver-based alloy, Consil 995. The separate cavity sections were coated with Tl-based high-temperature superconducting material using a two-step deposition and annealing process. The unloaded Q values for this coated clamshell cavity are 66,000 and 105,000 at 77 and 20 K, respectively. C1 UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS BERGISCHEN,W-5600 WUPPERTAL 1,GERMANY. RP ARENDT, PN (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD AUG PY 1992 VL 5 IS 4 BP 431 EP 435 DI 10.1007/BF00618144 PG 5 WC Physics, Applied; Physics, Condensed Matter SC Physics GA JW931 UT WOS:A1992JW93100015 ER PT J AU STEKEL, A SARRAO, JL BELL, TM LEI, M LEISURE, RG VISSCHER, WM MIGLIORI, A AF STEKEL, A SARRAO, JL BELL, TM LEI, M LEISURE, RG VISSCHER, WM MIGLIORI, A TI METHOD FOR IDENTIFICATION OF THE VIBRATIONAL-MODES OF A RECTANGULAR PARALLELEPIPED SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ELASTIC-CONSTANTS; RESONANCE METHOD; CRYSTALS AB An experimental method has been developed for identifying the vibrational modes of a rectangular parallelepiped solid, based on the study of its vertex motion. This method is an important enhancement of the resonant ultrasound spectroscopy technique for determination of elastic constants. The method was tested by identifying the modes of a sample of amorphous Ni80P20. The experimental setup developed to identify the modes is also useful in finding all the resonance frequencies of a solid. This technique is used on a single crystal of YbAs to illustrate the recovery of missed modes and the improvement in accuracy of the elastic constant determination. RP STEKEL, A (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 9 TC 11 Z9 11 U1 0 U2 6 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 AUG PY 1992 VL 92 IS 2 BP 663 EP 668 DI 10.1121/1.403991 PN 1 PG 6 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JG992 UT WOS:A1992JG99200003 ER PT J AU PAPCUN, G HOCHBERG, J THOMAS, TR LAROCHE, F ZACKS, J LEVY, S AF PAPCUN, G HOCHBERG, J THOMAS, TR LAROCHE, F ZACKS, J LEVY, S TI INFERRING ARTICULATION AND RECOGNIZING GESTURES FROM ACOUSTICS WITH A NEURAL NETWORK TRAINED ON X-RAY MICROBEAM DATA SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID VOCAL-TRACT; SPEECH; SEQUENCES; SIGNAL AB This paper describes a method for inferring articulatory parameters from acoustics with a neural network trained on paired acoustic and articulatory data. An x-ray microbeam recorded the vertical movements of the lower lip, tongue tip, and tongue dorsum of three speakers saying the English stop consonants in repeated Ce syllables. A neural network was then trained to map from simultaneously recorded acoustic data to the articulatory data. To evaluate learning, acoustics from the training set were passed through the neural network. To evaluate generalization, acoustics from speakers or consonants excluded from the training set were passed through the network. The articulatory trajectories thus inferred were a good fit to the actual movements in both the learning and generalization conditions, as judged by root-mean-square error and correlation. Inferred trajectories were also matched to templates of lower lip, tongue tip, and tongue dorsum release gestures extracted from the original data. This technique correctly recognized from 94.4% to 98.9% of all gestures in the learning and cross-speaker generalization conditions, and 75% of gestures underlying consonants excluded from the training set. In addition, greater regularity was observed for movements of articulators that were critical in the formation of each consonant. RP PAPCUN, G (reprint author), LOS ALAMOS NATL LAB,DIV COMP & COMMUN,MAIL STOP B265,LOS ALAMOS,NM 87545, USA. RI Zacks, Jeffrey/E-9099-2011 OI Zacks, Jeffrey/0000-0003-1171-3690 FU NIDCD NIH HHS [DC00162] NR 32 TC 43 Z9 45 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 AUG PY 1992 VL 92 IS 2 BP 688 EP 700 DI 10.1121/1.403994 PN 1 PG 13 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JG992 UT WOS:A1992JG99200007 PM 1506525 ER PT J AU DALTON, SM TOOLEONEIL, B GULLETT, BK DRUMMOND, CJ AF DALTON, SM TOOLEONEIL, B GULLETT, BK DRUMMOND, CJ TI SUMMARY OF THE 1991 EPRI EPA DOE SO2 CONTROL SYMPOSIUM SO JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION LA English DT Editorial Material AB The 1991 SO2 Control Symposium was held December 3-6, 1991, in Washington, D.C. The symposium, jointly sponsored by the Electric Power Research Institute (EPRI), the U.S. Environmental Protection Agency (EPA), and the U.S. Department of Energy (DOE), focused attention on recent improvements in conventional sulfur dioxide (SO2) control technologies, emerging processes, and strategies for complying with the Clean Air Act Amendments of 1990. Its purpose was to provide a forum for the exchange of technical and regulatory information on SO2 control technology. Over 800 representatives of 20 countries from government, academia, flue gas desulfurization (FGD) process suppliers, equipment manufacturers, engineering firms, and utilities attended. In all, 50 U.S. utilities and 10 utilities in other countries were represented. In 11 technical sessions, a diverse group of speakers presented 111 technical papers on development, operation, and commercialization of wet and dry FGD, Clean Coal Technologies, and combined sulfur dioxide/nitrogen oxides (SO2/NO(x)) processes. C1 US EPA,AIR & ENERGY ENGN RES LAB,RES TRIANGLE PK,NC 27711. US DOE,PITTSBURGH ENERGY TECHNOL CTR,DIV ENVIRONM CONTROL,PITTSBURGH,PA 15236. RP DALTON, SM (reprint author), ELECT POWER RES INST,SO2 CONTROL RES PROGRAM,3412 HILLVIEW AVE,POB 10412,PALO ALTO,CA 94303, USA. NR 64 TC 0 Z9 0 U1 0 U2 0 PU AIR & WASTE MANAGEMENT ASSOC PI PITTSBURGH PA PO BOX 2861, PITTSBURGH, PA 15230 SN 1047-3289 J9 J AIR WASTE MANAGE JI J. Air Waste Manage. Assoc. PD AUG PY 1992 VL 42 IS 8 BP 1110 EP 1117 PG 8 WC Engineering, Environmental; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA JK816 UT WOS:A1992JK81600012 ER PT J AU CINIBULK, MK THOMAS, G JOHNSON, SM AF CINIBULK, MK THOMAS, G JOHNSON, SM TI OXIDATION BEHAVIOR OF RARE-EARTH DISILICATE SILICON-NITRIDE CERAMICS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article; Proceedings Paper CT 93RD ANNUAL MEETING OF THE AMERICAN CERAMIC SOC CY APR 30, 1991 CL CINCINNATI, OH SP AMER CERAM SOC ID KINETICS; OXIDE AB The oxidation behavior and microstructure of the oxidized surfaces of RE2Si2O7-Si3N4 ceramics were investigated. The high oxidation resistance of these materials at 1400-degrees-C is attributed to the minimization of amorphous phases via devitrification to disilicates that are in equilibrium with SiO2, the oxidation product of Si3N4. Crystals of RE2Si2O7 grew out of the surface silicate in prefered orientations that were dictated by crystal structure. The morphology of the microstructure of the oxidized surfaces was shown to be partially dependent on the concentration of impurities; the presence of Ca was found to coincide with the growth of Gd2Si2O7 and Dy2Si2O7 crystals with high aspect ratios. C1 LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. SRI INT,MAT RES LAB,MENLO PK,CA 94025. NR 19 TC 101 Z9 102 U1 2 U2 8 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 AUG PY 1992 VL 75 IS 8 BP 2044 EP 2049 DI 10.1111/j.1151-2916.1992.tb04463.x PG 6 WC Materials Science, Ceramics SC Materials Science GA JH474 UT WOS:A1992JH47400003 ER PT J AU SUGAMA, T ALLAN, M HILL, JM AF SUGAMA, T ALLAN, M HILL, JM TI CALCIUM-PHOSPHATE CEMENTS PREPARED BY ACID-BASE REACTION SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID GLASS AB We investigated the characteristics of calcium phosphate cements (CPC) prepared by an exothermic acid-base reaction between NH4H2PO4-based fertilizer (Poly-N) and calcium aluminate compounds (CAC), such as 3CaO.Al2O3 (C3A), CaO.Al2O3 (CA), and CaO.2Al2O3 (CA2), in a series of integrated studies of reaction kinetics, interfacial reactions, in-situ phase transformations, and microstructure development. Two groups were compared: untreated and hydrothermally treated CPC specimens. The extent of reactivity of CAC with Poly-N at 25-degrees-C was in the following order: CA > C3A much greater than CA2. The formation of a NH4CaPO4.xH2O salt during this reaction was responsible for the development of strength in the CPC specimens. The in-situ phase transformation of amorphous NH4CaPO4.xH2O into crystalline Ca5(PO4)3(OH) and the conversion of hydrous Al2O3 gel --> gamma-AlOOH occur in cement bodies during exposure in an autoclave to temperatures up to 300-degrees-C. This phase transformation significantly improved mechanical strength. C1 CORNELL UNIV,DEPT MAT SCI,ITHACA,NY 14853. RP SUGAMA, T (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV ENERGY EFFICIENCY & CONSERVAT,UPTON,NY 11973, USA. NR 20 TC 22 Z9 23 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 AUG PY 1992 VL 75 IS 8 BP 2076 EP 2087 DI 10.1111/j.1151-2916.1992.tb04468.x PG 12 WC Materials Science, Ceramics SC Materials Science GA JH474 UT WOS:A1992JH47400008 ER PT J AU ASELAGE, TL TISSOT, RG AF ASELAGE, TL TISSOT, RG TI LATTICE-CONSTANTS OF BORON CARBIDES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID CARBON AB The lattice constants of boron carbides have been determined by powder X-ray diffraction for samples with compositions between about 7.7 and 20.5 at.% carbon. The boundaries of the single-phase region are at about 9 at.% carbon and near, but likely somewhat less than, 20 at.% carbon. The composition dependence of the lattice constants thus established provides a method of assessing the carbon concentration of unknown materials. In particular, assignment of the approximate composition of single crystals used in previous studies allows for a systematic examination of changes in interatomic separation as a function of composition. These changes are discussed in terms of a structural model of the boron carbide solid solution. RP ASELAGE, TL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 38 TC 44 Z9 44 U1 1 U2 12 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 AUG PY 1992 VL 75 IS 8 BP 2207 EP 2212 DI 10.1111/j.1151-2916.1992.tb04485.x PG 6 WC Materials Science, Ceramics SC Materials Science GA JH474 UT WOS:A1992JH47400025 ER PT J AU CHAMBERS, RS AF CHAMBERS, RS TI NUMERICAL-INTEGRATION OF THE HEREDITARY INTEGRALS IN A VISCOELASTIC MODEL FOR GLASS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID STRUCTURAL RELAXATION AB Numerical schemes are developed to evaluate the integrals produced by the temporal discretization of the hereditary constitutive equations for a viscoelastic model of glass. Such schemes can be implemented in a material module of a finite element code to provide a general capability for analyzing residual stresses in complicated glass components subjected to nonuniform cooling histories. The robustness of the integration strategy increases the accuracy of a finite element stress analysis, lessens the need for discriminating time step controls, and can reduce the number of time steps required to generate accurate transient solutions incrementally. RP CHAMBERS, RS (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 11 TC 3 Z9 3 U1 0 U2 1 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD AUG PY 1992 VL 75 IS 8 BP 2213 EP 2218 DI 10.1111/j.1151-2916.1992.tb04486.x PG 6 WC Materials Science, Ceramics SC Materials Science GA JH474 UT WOS:A1992JH47400026 ER PT J AU DOEFF, MM LERNER, MM VISCO, SJ DEJONGHE, LC AF DOEFF, MM LERNER, MM VISCO, SJ DEJONGHE, LC TI THE USE OF POLYDISULFIDES AND COPOLYMERIC DISULFIDES IN THE LI/PEO/SRPE BATTERY SYSTEM SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID REDOX POLYMERIZATION ELECTRODES; RECHARGEABLE LITHIUM BATTERIES; ALL-SOLID-STATE; OVERCHARGE PROTECTION; THIN-FILM AB Solid redox polymerization electrodes (SRPEs) have recently been used successfully as cathodes in lithium solid polymer electrolyte batteries. SRPEs contain organopolydisulfides, (SRS)n, as the electroactive material; upon cell discharge these materials are reductively depolymerized via scission of the disulfide linkages to di- or trithiolate salts. The thiolate salts are reoxidized to the polymeric disulfides when the cell is recharged. Organopolydisulfides are easily synthesized via a one-step process, are inexpensive, and exhibit high performance levels in batteries. A characteristic unique to the SRPE is the facile modification of physical and electrochemical properties simply by changing the organic group R, or the ability to combine the desirable features of several compounds by copolymerization. The discharge characteristics of several different polymeric and copolymeric disulfides are presented in this paper. In general aliphatic organopolydisulfides exhibit a flat discharge potential of about 2 V vs. Li, while others have higher cell voltages. The low equivalent weight and the high utilization of thick cathodes of -(SCH2CH2S)n (X8) translate into high energy densities for lithium polymer electrolyte cells. RP DOEFF, MM (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Doeff, Marca/G-6722-2013 OI Doeff, Marca/0000-0002-2148-8047 NR 16 TC 51 Z9 59 U1 1 U2 10 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 AUG PY 1992 VL 139 IS 8 BP 2077 EP 2081 DI 10.1149/1.2221181 PG 5 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA JG901 UT WOS:A1992JG90100001 ER PT J AU LAUF, RJ DEVAN, JH AF LAUF, RJ DEVAN, JH TI EVALUATION OF CERAMIC INSULATORS FOR LITHIUM ELECTROCHEMICAL REDUCTION CELLS SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article AB Screening tests were conducted on 25 ceramics to evaluate their suitability as insulators in a Downs-type lithium electroreduction cell. Each material was exposed to molten lithium at 400-degrees-C for 100 h. Of the materials tested, beryllia, magnesia, yttria, yttrium aluminum garnet, and aluminum nitride were found to have acceptable compatibility with lithium. It is reasonable to expect that they are also compatible with molten LiCl-KCl electrolyte. These candidate materials can therefore be selected for various cell components based on fabricability or other considerations. RP LAUF, RJ (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 16 TC 15 Z9 15 U1 1 U2 2 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD AUG PY 1992 VL 139 IS 8 BP 2087 EP 2091 DI 10.1149/1.2221183 PG 5 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA JG901 UT WOS:A1992JG90100003 ER PT J AU HELFAND, MA CLAYTON, CR DIEGLE, RB SORENSON, NR AF HELFAND, MA CLAYTON, CR DIEGLE, RB SORENSON, NR TI THE ROLE OF P IN THE ANODIC INHIBITION OF AN AMORPHOUS CO-20P ALLOY IN ACIDIC ELECTROLYTES SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID RAY PHOTOELECTRON-SPECTROSCOPY; METALLOID METALLIC GLASSES; STAINLESS-STEEL; CORROSION; PASSIVITY; DISSOLUTION; MOLYBDENUM; CHEMISTRY; LAYERS; OXIDES AB Anodic polarization of an amorphous Co-20P alloy in deaerated 0.2N H2SO4 or 0.2N HCl shows alloy dissolution to be inhibited at Potentials between approximately -0.3 and 0.2 V (SCE), while pure crystalline Co dissolves readily and does not passivate at anodic potentials in either electrolyte. Analysis of Co-20P surfaces by x-ray photoelectron spectroscopy after anodic polarization reveals an enrichment of elemental P in the near-surface region, the presence of approximately a monolayer of hypophosphite and phosphate ions on the surface, and a virtual absence of oxidized cobalt species. Thus, the Co-20P alloy does not inhibit dissolution by the development of a three-dimensional cobalt oxide film. A chemical process that is controlled by the formation and surface retention of hypophosphite anions is proposed. An identical passivation mechanism has bee previously observed with an amorphous Ni-20P alloy. C1 SUNY STONY BROOK,DEPT MAT SCI & ENGN,STONY BROOK,NY 11794. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 22 TC 30 Z9 30 U1 0 U2 0 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 AUG PY 1992 VL 139 IS 8 BP 2121 EP 2128 DI 10.1149/1.2221189 PG 8 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA JG901 UT WOS:A1992JG90100009 ER PT J AU GRADY, DE AF GRADY, DE TI PROPERTIES OF AN ADIABATIC SHEAR-BAND PROCESS ZONE SO JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS LA English DT Article ID HIGH-STRAIN RATES; GROWTH; LOCALIZATION; INSTABILITY; FLOW AB THE FORMATION of adiabatic shear bands is examined with an approximate analytic model. The shear band is viewed as a propagating feature with a well-defined front. The shear band is further partitioned into a shear-band process zone within which most of the adiabatic heating and shear stress relaxation occurs, followed by a quasi-steady zone within which little dissipation occurs. Although a one-dimensional analysis of the shear-band dynamics is initially pursued, the analysis is then used to calculate properties of the inherently two-dimensional shear-band process zone. The length and width of the process zone are calculated along with the shear displacement. The model is further used to calculate the energy dissipation within the shear-band process zone and the concept of a shear-band toughness is introduced. The flow field within the vicinity of the process zone is also examined. Calculated properties of the shear-band process zone compared well with available experimental data. RP GRADY, DE (reprint author), SANDIA NATL LABS,DIV EXPTL IMPACT PHYS,ALBUQUERQUE,NM 87185, USA. NR 28 TC 48 Z9 58 U1 2 U2 13 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 AUG PY 1992 VL 40 IS 6 BP 1197 EP 1215 DI 10.1016/0022-5096(92)90012-Q PG 19 WC Materials Science, Multidisciplinary; Mechanics; Physics, Condensed Matter SC Materials Science; Mechanics; Physics GA JJ335 UT WOS:A1992JJ33500002 ER PT J AU CHARATIS, G DELAMATER, ND BUSCH, GE BOSCH, RA GANGER, GG THORNBURG, JL BRUNDAGE, JR SULLIVAN, D NEAL, HA SHEPHARD, RL KEANE, CJ OSTERHELD, AL EDER, DC MATTHEWS, DL AF CHARATIS, G DELAMATER, ND BUSCH, GE BOSCH, RA GANGER, GG THORNBURG, JL BRUNDAGE, JR SULLIVAN, D NEAL, HA SHEPHARD, RL KEANE, CJ OSTERHELD, AL EDER, DC MATTHEWS, DL TI EVIDENCE FOR POPULATION INVERSIONS IN AL AND MG BY LASER IRRADIATION AT 20-PS PULSE LENGTHS SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID X-RAY LASERS; HYDROGENLIKE MAGNESIUM AB In the course of conducting laser-target interaction experiments at 20-ps pulse length using Al and Mg targets, to determine the ionization balance of these elements, time-resolved K-shell spectral line strengths were obtained, suggesting population inversions between excited levels in both He-like and H-like ions. Effects of resonance-line opacities need to be analyzed in more detail, but opacity effects alone do not account for the anomalous line-intensity ratios that are observed to persist 200-300 ps after the laser pulse. Comparisons with 50-ps and 100-ps pulse shots do not show evidence of inversion, although nonequilibrium spectral line-intensity distributions are observed. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP CHARATIS, G (reprint author), KMS FUSION INC,ANN ARBOR,MI 48106, USA. NR 14 TC 5 Z9 5 U1 2 U2 4 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 AUG PY 1992 VL 9 IS 8 BP 1278 EP 1282 DI 10.1364/JOSAB.9.001278 PG 5 WC Optics SC Optics GA JH653 UT WOS:A1992JH65300009 ER PT J AU SARGENT, M KOCH, SW CHOW, WW AF SARGENT, M KOCH, SW CHOW, WW TI SIDE-MODE GAIN IN SEMICONDUCTOR-LASERS SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID POPULATION PULSATIONS AB Side-mode gain and coupling coefficients in semiconductor laser media are calculated with the use of a multimode Fourier technique valid both for mode spacings that are small compared with the carrier-carrier relaxation rates and for spacings comparable with these rates as predicted by the Boltzmann theory of Binder et al. [Phys. Rev. B 45, 1107 (1992)]. The medium is described by a free-carrier model that provides for carrier-probability pulsations around quasi-equilibrium Fermi-Dirac values. We find that population pulsations play just as important a role as spectral hole burning for mode spacings comparable with the intraband relaxation rates. For the carrier-carrier relaxation rates of Binder et al., side-mode gain is predicted to be smaller than the main-mode gain, leading to single-mode operation. However, for somewhat smaller intraband relaxation rates, side-mode pin is readily found that exceeds the single-mode pin, which would encourage multimode operation. In addition, we find that the gain and coupling coefficient spectra are sensitive to the k dependence of the carrier-carrier relaxation rates and might provide a useful way to measure these rates. We are also able to explain the asymmetric side-mode gain spectra for small beat frequencies in terms of the rapid decrease of the quasi-equilibrium Fermi-Dirac electron distribution just above the gain region. C1 SANDIA NATL LABS, DIV 2531, ALBUQUERQUE, NM 87185 USA. RP UNIV ARIZONA, CTR OPT SCI, TUCSON, AZ 85721 USA. NR 18 TC 9 Z9 9 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0740-3224 EI 1520-8540 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD AUG PY 1992 VL 9 IS 8 BP 1288 EP 1298 DI 10.1364/JOSAB.9.001288 PG 11 WC Optics SC Optics GA JH653 UT WOS:A1992JH65300011 ER PT J AU MILLER, DL WILLIAMS, AR AF MILLER, DL WILLIAMS, AR TI NUCLEATION AND EVOLUTION OF ULTRASONIC CAVITATION IN A ROTATING EXPOSURE CHAMBER SO JOURNAL OF ULTRASOUND IN MEDICINE LA English DT Article DE MEDICAL ULTRASOUND; BIOLOGICAL EFFECTS; HEMOLYSIS; ULTRASONIC CAVITATION ID INVITRO; SYSTEM AB The nucleation and progression of ultrasonic cavitation in a rotating exposure chamber were investigated by observing hemolysis of a 0.5% suspension of erythrocytes. Bursts of 1.6 MHz ultrasound beams of 11 W/cm2 spatial peak intensity were synchronized with the rotation to aim the bursts down the axis of a cylindrical chamber. Cavitational hemolysis always occurred in fresh phosphate buffered saline (PBS) solution, but cavitation incidence declined to 38% in 4 day old PBS. The amount of hemolysis for 11 ms or 44 ms bursts with 60 rpm rotation increased in proportion to the number of bursts. Hemolysis was found above a minimum burst duration of 5.5 to 8.3 ms in the normal 2 cm chamber. This did not appear to change for 1 cm or 4 cm chamber lengths, but it did change to about 2.2 ms and about 44 ms for over- and undersaturated gas conditions, respectively. Off-times associated with rotation speeds of 15 to 30 rpm reduced the effectiveness of the cavitation, and addition of fixed cells at only 0.01% to 0.02% greatly reduced the hemolysis. For this ultrasonic exposure system, several thousand bubbles, possibly generated from as few as one cavitation nucleus, move across the chamber at up to 10 m/s, each lysing a few hundred cells, and then are cycled back to the front of the chamber by the rotation to reinitiate the cavitation on the next burst. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. UNIV MANCHESTER, DEPT MED BIOPHYS, MANCHESTER M13 9PL, LANCS, ENGLAND. FU NCI NIH HHS [CA42947] NR 13 TC 25 Z9 25 U1 1 U2 1 PU AMER INST ULTRASOUND MEDICINE PI LAUREL PA SUBSCRIPTION DEPT, 14750 SWEITZER LANE, STE 100, LAUREL, MD 20707-5906 SN 0278-4297 J9 J ULTRAS MED JI J. Ultrasound Med. PD AUG PY 1992 VL 11 IS 8 BP 407 EP 412 PG 6 WC Acoustics; Radiology, Nuclear Medicine & Medical Imaging SC Acoustics; Radiology, Nuclear Medicine & Medical Imaging GA KY024 UT WOS:A1992KY02400004 PM 1495132 ER PT J AU KESTI, J AF KESTI, J TI TECHNOPOLITICS AT MLA SO LIBRARY JOURNAL LA English DT Article RP KESTI, J (reprint author), SANDIA NATL LABS,TECH LIB,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BOWKER MAGAZINE GROUP CAHNERS MAGAZINE DIVISION PI NEW YORK PA 249 W 17TH ST, NEW YORK, NY 10011 SN 0363-0277 J9 LIBR J JI Libr. J. PD AUG PY 1992 VL 117 IS 13 BP 63 EP 64 PG 2 WC Information Science & Library Science SC Information Science & Library Science GA JJ161 UT WOS:A1992JJ16100014 ER PT J AU GAGE, DA HUANG, ZH BENNING, C AF GAGE, DA HUANG, ZH BENNING, C TI COMPARISON OF SULFOQUINOVOSYL DIACYLGLYCEROL FROM SPINACH AND THE PURPLE BACTERIUM RHODOBACTER-SPHAEROIDES BY FAST-ATOM-BOMBARDMENT TANDEM MASS-SPECTROMETRY SO LIPIDS LA English DT Article AB Isolated sulfoquinovosyl-diacylglycerol (SQD) from spinach and the purple bacterium Rhodobacter sphaeroides provide two sources of very different molecular species of SQD. We were able to demonstrate by fast atom bombardment-collisionally activated dissociation tandem mass spectrometry in the negative ion mode that the sulfoquinovosyl head group of the plant and bacterial lipids can be characterized by the common fragmentation pattern found in the spectra of both samples. Differences in the acyl functions from the two sources were also identified by this technique. SQD specific fragments are found at m/z 299, 283, 241, 225, 165 and 80 which indicate the presence of the sulfoquinovosyl moiety. The two predominant molecular species found in spinach contain palmitic and linolenic ([M-H]- at m/z 815) or two linolenic acids ([M-H]- at m/z 837) in the sn-1 and sn-2 positions, while the two major species, of the bacterial lipid contain palmitic and 18:1 (vaccenic) acids ([M-H]- at m/z 819) or stearic and 18:1 (vaccenic) acids, ([M-H]- at m/z 847), respectively. C1 MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824. RP GAGE, DA (reprint author), MICHIGAN STATE UNIV,NIH,DEPT BIOCHEM,MASS SPECTROMETRY FACIL,E LANSING,MI 48824, USA. FU NCRR NIH HHS [RR-00480] NR 19 TC 43 Z9 46 U1 0 U2 5 PU AMER OIL CHEMISTS SOC PI CHAMPAIGN PA 1608 BROADMOOR DRIVE, CHAMPAIGN, IL 61821-0489 SN 0024-4201 J9 LIPIDS JI Lipids PD AUG PY 1992 VL 27 IS 8 BP 632 EP 636 DI 10.1007/BF02536123 PG 5 WC Biochemistry & Molecular Biology; Nutrition & Dietetics SC Biochemistry & Molecular Biology; Nutrition & Dietetics GA JH539 UT WOS:A1992JH53900012 PM 1406075 ER PT J AU MCCLUNG, RW MCGUIRE, DJ AF MCCLUNG, RW MCGUIRE, DJ TI EARLY DEVELOPMENTS IN NONDESTRUCTIVE TESTING AT THE OAK-RIDGE-NATIONAL-LABORATORY SO MATERIALS EVALUATION LA English DT Article C1 OAK RIDGE NATL LAB,NDT GRP,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NON-DESTRUCTIVE TEST PI COLUMBUS PA 1711 ARLINGATE LANE PO BOX 28518, COLUMBUS, OH 43228-0518 SN 0025-5327 J9 MATER EVAL JI Mater. Eval. PD AUG PY 1992 VL 50 IS 8 BP 956 EP 960 PG 5 WC Materials Science, Characterization & Testing SC Materials Science GA JJ799 UT WOS:A1992JJ79900011 ER PT J AU MATSON, DW LINEHAN, JC BEAN, RM AF MATSON, DW LINEHAN, JC BEAN, RM TI ULTRAFINE IRON-OXIDE POWDERS GENERATED USING A FLOW-THROUGH HYDROTHERMAL PROCESS SO MATERIALS LETTERS LA English DT Article ID CATALYSTS AB The rapid thermal decomposition of precursors in solution (RTDS) method is introduced as a mechanism for generating ultrafine iron oxide powders Particle size and crystallinity characteristics are related to the RTDS processing conditions and to the salt used as the iron oxide precursor. RP MATSON, DW (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 7 TC 14 Z9 16 U1 2 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-577X J9 MATER LETT JI Mater. Lett. PD AUG PY 1992 VL 14 IS 4 BP 222 EP 226 DI 10.1016/0167-577X(92)90160-L PG 5 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA JJ506 UT WOS:A1992JJ50600009 ER PT J AU BINER, SB AF BINER, SB TI THE ROLE OF FIBER MORPHOLOGY ON THE CREEP-BEHAVIOR OF DISCONTINUOUS-FIBER-REINFORCED COMPOSITES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID VOID GROWTH; METAL; DEFORMATION AB The role of the geometrical parameters of the fibers and effects of fiber distribution in the matrix on the creep deformation behavior of 20% discontinuous-fiber-reinforced composite were numerically investigated, including the debonding and fiber pull-out mechanisms. During the analyses, it is assumed that the matrix deforms with a power-law creep relationship and the fibers are rigid. The debonding behavior at the inter-face was simulated in terms of a cohesive zone model which describes the decohesion by both normal and tangential separation. The results indicate that, for a given fiber geometry and distribution parameters in the matrix, an increase in the interfacial strength or an increase in the work of separation per unit area of interface reduces the creep rates. For even very weak interface characteristics, it is possible to achieve lower creep rates and delayed interface failure by suitable selection of the geometrical parameters of fibers and by controlling the distribution of fibers in the matrix. The role of applied stress direction and formation of a more ductile phase between the fibers and the matrix in the overall creep behavior were also elucidated. RP BINER, SB (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 21 TC 8 Z9 8 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD AUG 1 PY 1992 VL 156 IS 1 BP 21 EP 31 DI 10.1016/0921-5093(92)90412-T PG 11 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JH329 UT WOS:A1992JH32900003 ER PT J AU ZEIK, KL KOSS, DA ANDERSON, IE HOWELL, PR AF ZEIK, KL KOSS, DA ANDERSON, IE HOWELL, PR TI MICROSTRUCTURAL EVOLUTION AND THERMAL-STABILITY ASSOCIATED WITH A GAS-ATOMIZED CU-NB ALLOY SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID MONOTECTIC REACTION; COMPOSITES; STRENGTH AB High-pressure inert gas atomization (HPGA) has been used to produce rapidly solidified Cu-21Nb-2Mo (weight percent) powders with a range of particle sizes and microstructures. The associated microstructures depend on particle size. Specifically, fine-scale particles (<15-mu-m) are characterized by a predominance of multiphase spheroids and a small population of Nb-based dendrites in an almost pure matrix of Cu. In contrast, large particles (45 to 75-mu-m) contain only Nb-based dendrites in a Cu matrix. The volume fraction of the dispersed constituent is much higher in the former instance than in the latter. The change in microstructure with particle size is analyzed in terms of both the amount of undercooling and cooling rate of the liquid droplets prior to and during solidification. In particular, the large undercoolings in the fine particles are believed to induce a nonequilibrium liquid phase separation which results in a high volume fraction of spheroidal, multiphase Nb-Cu particles within a Cu-rich matrix containing Nb-rich dendrites. High-temperature (900-degrees-C) isothermal annealing treatments have also been performed on consolidated material to determine the inherent thermal stability of these microstructures. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. PENN STATE UNIV,DIV MET SCI & ENGN,UNIV PK,PA 16802. RP ZEIK, KL (reprint author), US STEEL CORP,CTR TECH,MONROEVILLE,PA 15146, USA. NR 31 TC 11 Z9 11 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD AUG PY 1992 VL 23 IS 8 BP 2159 EP 2167 DI 10.1007/BF02646009 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA JG400 UT WOS:A1992JG40000009 ER PT J AU ODEN, LL GOKCEN, NA AF ODEN, LL GOKCEN, NA TI CU-C AND AL-CU-C PHASE-DIAGRAMS AND THERMODYNAMIC PROPERTIES OF C IN THE ALLOYS FROM 1550-DEGREES-C TO 2300 DEGREES-C SO METALLURGICAL TRANSACTIONS B-PROCESS METALLURGY LA English DT Article ID EQUILIBRIA; SYSTEM AB The Cu-C and Al-Cu-C phase diagrams were determined at 1550-degrees-C to 2300-degrees-C by chemical and X-ray diffraction analyses of alloys saturated with carbon within sealed graphite crucibles. Isothermal sections for the ternary system were determined at intervals of 150-degrees-C over the range of temperatures investigated. The univariant points in atomic percent on the 1700-degrees-C, 1850-degrees-C, and 2000-degrees-C isotherms are 70.7Al-28.9Cu-0.4C, 74.4Al-24.0Cu-1.6C, and 78.3Al-17.0Cu-4.7C, respectively, as determined by metallographic examination of rapidly cooled alloys. Graphite and A14C3 (decomposition temperature 2156-degrees-C) were the only solid phases observed at these temperatures. The excess partial Gibbs energy for dissolved carbon in the liquid Al-Cu-C solutions in equilibrium with C, as calculated from the experimental solubilities, is G(c)eBAR = -RT In x = y2[176,860 - 55.42T - (224,200 - 110.84T)x] + z2[237,000 - 48.61T] + yz[320,510 - 36.77T + (30,180 + 35.10T)z + (51,570 - 74.13T)yz + (246,400 - 88.04T)yz2 - 60,000], J/g atom where R is the gas constant, T is the temperature in K, and x, y, and z are the atomic fractions of C, Al, and Cu, respectively. The equation also is a good approximation for liquid solutions in equilibrium with A14C3. RP ODEN, LL (reprint author), US BUR MINES,ALBANY RES CTR,ALBANY,OR 97321, USA. NR 24 TC 22 Z9 22 U1 1 U2 6 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2141 J9 METALL TRANS B PD AUG PY 1992 VL 23 IS 4 BP 453 EP 458 DI 10.1007/BF02649664 PG 6 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA JG551 UT WOS:A1992JG55100007 ER PT J AU ULA, N COOPER, G DAVIDSON, C SWIERKOWSKI, SP HUNT, CE AF ULA, N COOPER, G DAVIDSON, C SWIERKOWSKI, SP HUNT, CE TI DESIGN OPTIMIZATION AND MODELING OF HIGH-SPEED GAAS CHARGE-COUPLED-DEVICES SO MICROWAVE JOURNAL LA English DT Article ID CCD; CIRCUITS; ANALOG C1 LAWRENCE LIVERMORE NATL LAB,DIV ENGN RES,SOLIDSTATE DEVICES & MICROSTRUCT GRP,LIVERMORE,CA 94550. UNIV CALIF DAVIS,DEPT ELECT & COMP ENGN,DAVIS,CA 95616. RP ULA, N (reprint author), LOYOLA MARYMOUNT UNIV,DEPT ELECT ENGN,LOS ANGELES,CA 90045, USA. NR 35 TC 0 Z9 0 U1 0 U2 0 PU HORIZON HOUSE-MICROWAVE PI NORWOOD PA 685 CANTON ST, NORWOOD, MA 02062 SN 0192-6225 J9 MICROWAVE J JI Microw. J. PD AUG PY 1992 VL 35 IS 8 BP 84 EP & PG 0 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA JW311 UT WOS:A1992JW31100005 ER PT J AU GHAN, SJ EASTER, RC AF GHAN, SJ EASTER, RC TI COMPUTATIONALLY EFFICIENT APPROXIMATIONS TO STRATIFORM CLOUD MICROPHYSICS PARAMETERIZATION SO MONTHLY WEATHER REVIEW LA English DT Article ID NUMERICAL-SIMULATION; MICROSCALE STRUCTURE; ISOLATED MICROBURST; FRONTAL RAINBANDS; MODEL; MESOSCALE; THUNDERSTORM; PRECIPITATION; ORGANIZATION; FEEDBACK AB Bulk cloud microphysics parameterizations typically employ time steps of a few tens of seconds. Although the computational burden of these parameterizations is acceptable for the 1-day mesoscale cloud simulations for which they were designed, the time steps are unacceptably short for direct application of these parameterizations to global-climate simulation. To increase the computational efficiency of bulk cloud microphysics parameterizations, we introduce two approximations that are appropriate for stratiform clouds. By diagnosing rather than predicting rain and snow concentrations and by assuming instantaneous melting of snow, we have found that the permissible time step is increased tenfold (to 2-6 min) with little loss in accuracy for vertical motions and time scales characteristic of those resolved by general circulation models (GCMs). Such time steps are sufficiently long to permit application of bulk cloud microphysical parameterizations to GCMs for multiyear global simulations. However, we also find that the vertical resolution must be considerably finer (100-200 m) than that currently employed in GCMs. RP GHAN, SJ (reprint author), PACIFIC NW LAB, BATTELLE BLVD, POB 999, RICHLAND, WA 99352 USA. RI Ghan, Steven/H-4301-2011 OI Ghan, Steven/0000-0001-8355-8699 NR 26 TC 49 Z9 49 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0027-0644 J9 MON WEATHER REV JI Mon. Weather Rev. PD AUG PY 1992 VL 120 IS 8 BP 1572 EP 1582 DI 10.1175/1520-0493(1992)120<1572:CEATSC>2.0.CO;2 PG 11 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA JF238 UT WOS:A1992JF23800006 ER PT J AU BERGE, E KRISTJANSSON, JE AF BERGE, E KRISTJANSSON, JE TI NUMERICAL WEATHER SIMULATIONS WITH DIFFERENT FORMULATIONS FOR THE ADVECTION OF HUMIDITY AND CLOUD WATER SO MONTHLY WEATHER REVIEW LA English DT Article ID SMALL IMPLICIT DIFFUSION; NONLINEAR RENORMALIZATION; TRANSPORT ALGORITHM; MODEL; SCHEME; EQUATION; FLUXES AB This study investigates the effect on short-range weather prediction of using different numerical advection schemes for humidity and cloud water. Comparisons are made between predictions using the basic centered and upstream schemes and the more sophisticated Smolarkiewicz and Bott schemes. The main purpose of these alternative schemes is to reduce numerical diffusion and dispersion errors encountered in the basic schemes and thereby preserve the shape of features such as fronts. At the same time those schemes are efficient enough to be a realistic choice for operational models. The simulations are made with a numerical weather prediction model with 150-km horizontal resolution and ten levels. Frontal movements over large distances have been investigated in a domain that extends from eastern North America through Europe. The simulations yield little sensitivity to the choice of advection scheme for cloud water. On the other hand, a large sensitivity to the treatment of the humidity advection is found. This is connected to a substantial feedback with the model dynamics through release of latent heat. Larger numerical errors are identified with the basic schemes than with the alternative schemes, which yield a better shape preservation of the frontal zones. The centered scheme tends to give the heaviest precipitation and the deepest cyclones, while the upstream scheme gives least precipitation. Exaggerated low-level cloudiness is found with the Bott scheme and, to some extent, the Smolarkiewicz scheme. This appears to be caused by insufficient adjustment of other parts of the model to the new, more accurate, transport formulation. The Bott scheme has less numerical diffusion than the Smolarkiewicz scheme, but is somewhat more expensive computationally. RP LOS ALAMOS NATL LAB, GEOANAL GRP EES-5, LOS ALAMOS, NM 87545 USA. NR 28 TC 13 Z9 13 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 USA SN 0027-0644 EI 1520-0493 J9 MON WEATHER REV JI Mon. Weather Rev. PD AUG PY 1992 VL 120 IS 8 BP 1583 EP 1602 DI 10.1175/1520-0493(1992)120<1583:NWSWDF>2.0.CO;2 PG 20 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA JF238 UT WOS:A1992JF23800007 ER PT J AU ECKSTEIN, JN BOZOVIC, I KLAUSMEIERBROWN, ME VIRSHUP, GF RALLS, KS AF ECKSTEIN, JN BOZOVIC, I KLAUSMEIERBROWN, ME VIRSHUP, GF RALLS, KS TI CONTROL OF COMPOSITION AND MICROSTRUCTURE IN HIGH-TEMPERATURE SUPERCONDUCTORS AT THE ATOMIC LEVEL BY MOLECULAR-BEAM EPITAXY SO MRS BULLETIN LA English DT Article ID THIN-FILMS; YBA2CU3O7-X/PRBA2CU3O7-X SUPERLATTICES; GROWTH C1 LAWRENCE LIVERMORE NATL LAB,DIV CONDENSED MATTER & ANALYT SCI,LIVERMORE,CA 94550. RP ECKSTEIN, JN (reprint author), VARIAN RES CTR,PALO ACTO,CA, USA. NR 20 TC 23 Z9 23 U1 3 U2 5 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 AUG PY 1992 VL 17 IS 8 BP 27 EP 33 PG 7 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA JK668 UT WOS:A1992JK66800004 ER PT J AU SKOG, K KNIZE, MG FELTON, JS JAGERSTAD, M AF SKOG, K KNIZE, MG FELTON, JS JAGERSTAD, M TI FORMATION OF NEW HETEROCYCLIC AMINE MUTAGENS BY HEATING CREATININE, ALANINE, THREONINE AND GLUCOSE SO MUTATION RESEARCH LA English DT Article DE FOOD MUTAGENS; AMES TEST; MODEL SYSTEMS; MEIQX; DIMEIQX; TRIMEIQX; CREATINE; CREATININE; GLUCOSE; ALANINE; THREONINE ID MAILLARD-REACTION-PRODUCTS; MODEL SYSTEMS; FRIED BEEF; IDENTIFICATION; PRECURSORS; ACIDS; MEAT; FOOD; PHIP AB A mixture of alanine, threonine, creatinine and glucose was heated in diethylene glycol and water (5:1, v/v) for 15 min at 200-degrees-C. The mutagens formed were purified by high-performance liquid chromatography using the Ames/Salmonella mutagenic activity to guide the purification. The structures of the purified mutagens were determined using UV absorption, mass and NMR spectrometry. A new mutagenic compound with a mass number of 217 was found and its mass spectrum did not correspond to any known mutagen derived from food. This new compound accounted for 4% of the total mutagenic activity. Other mutagenic compounds were identified as MeIQx (2-amino-3,8-dimethylimidazo[4,5f]quinoxaline), 4,8-DiMeIQx (2-amino-3,4,8-trimethylimidazo[4,5-f]quinoxaline), and a new mutagen 4,7,8-TriMeIQx (2-amino-3,4,7,8-tetramethylimidazo[4,5-f]quinoxaline) with a mutagenic activity of 73,000 TA98 revertants per Ag. The percentage of the mutagenic activity attributable to MeIQx, 4,8-DiMeIQx and 4,7,8-TriMeIQx was 10%, 70% and 3%, respectively. The yield of MeIQx, 4,8-DiMeIQx and 4,7,8-TriMeIQx was 10, 36 and 6 nmole/mmole creatinine. The formation of TriMeIQx from natural meat components suggests that this new quinoxaline mutagen may be present in cooked foods. C1 LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. RP SKOG, K (reprint author), UNIV LUND,CTR CHEM,DEPT FOOD CHEM,POB 124,S-22100 LUND,SWEDEN. FU NIEHS NIH HHS [2224O1-ES-70158]; PHS HHS [R0140811] NR 19 TC 38 Z9 39 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8262 J9 MUTAT RES PD AUG PY 1992 VL 268 IS 2 BP 191 EP 197 DI 10.1016/0027-5107(92)90224-P PG 7 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA JJ019 UT WOS:A1992JJ01900004 PM 1379324 ER PT J AU BROWN, D DELVILLEDESBOIS, MH VOLLHARDT, KPC ASTRUC, D AF BROWN, D DELVILLEDESBOIS, MH VOLLHARDT, KPC ASTRUC, D TI SPECIFIC METAL RECOGNITION IN THE REDOX CHEMISTRY OF THE HETEROBINUCLEAR FULVALENE COMPLEXES [WM(FULVALENE)(CO)5], M=FE OR RU AND ACCESS TO TETRANUCLEAR DIFULVALENE COMPLEXES SO NEW JOURNAL OF CHEMISTRY LA English DT Article ID ORGANOMETALLIC ELECTRON-RESERVOIRS; CHEMICAL-REACTIONS; 19-ELECTRON COMPLEXES; TRANSFER CATALYSIS; BOND ACTIVATION; CHAIN CATALYSIS; CHARGE-TRANSFER; KINETICS; MECHANISMS; REDUCTION AB The cyclic voltammetry studies of [WM(Fv)(CO)5] (FV = Fulvalene, M = Fe or Ru) allow to differentiate the two metals either on the cathodic or on the anodic side which leads to further direct syntheses of tetranuclear difulvalene complexes by single-electron transfer. A two-electron irreversible reduction is observed for M = Ru (2) as for the homobimetallic Ru2 and W2 complexes whereas two one-electron reduction waves are recorded for M = Fe (1). The ultimate reduction products [WM(Fv)(CO)5]= in which the W-M bond is broken, are thus formed directly with M = Ru but in two successive steps with M = Fe. In the latter case, the intermediate tetranuclear complex [WFe(Fv)(CO)5]2=, 4, is formed, isolated as a dimethyl complex 6 and fully characterized. The irreversible anodic oxidation of [WFe(Fv)(CO)5]=, 3, proceeds in two steps, the first one leading to the characterized tetranuclear intermediate 4. Further irreversible oxidation of 4 gives back the starting material 1. C1 LAWRENCE BERKELEY LAB, DIV CHEM SCI, BERKELEY, CA 94720 USA. UNIV BORDEAUX 1, CHIM ORGAN & ORGANOMETALL LAB, CNRS, URA 35, F-33405 TALENCE, FRANCE. RP UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. RI DELVILLE, Marie-Helene/C-6040-2011 OI DELVILLE, Marie-Helene/0000-0001-8863-8225 NR 93 TC 21 Z9 21 U1 0 U2 0 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND SN 1144-0546 EI 1369-9261 J9 NEW J CHEM JI New J. Chem. PD AUG-SEP PY 1992 VL 16 IS 8-9 BP 899 EP 908 PG 10 WC Chemistry, Multidisciplinary SC Chemistry GA KC034 UT WOS:A1992KC03400011 ER PT J AU WULLSCHLEGER, SD NORBY, RJ GUNDERSON, CA AF WULLSCHLEGER, SD NORBY, RJ GUNDERSON, CA TI GROWTH AND MAINTENANCE RESPIRATION IN LEAVES OF LIRIODENDRON-TULIPIFERA L EXPOSED TO LONG-TERM CARBON-DIOXIDE ENRICHMENT IN THE FIELD SO NEW PHYTOLOGIST LA English DT Article DE CARBON DIOXIDE; GROWTH RESPIRATION; LIRIODENDRON-TULIPIFERA; MAINTENANCE RESPIRATION; DARK RESPIRATION ID ELEVATED CO2; ATMOSPHERIC CO2; PLANTS; RESPONSES; NITROGEN; MODEL; INCREASE; EFFLUX; C-3 AB Specific respiration rate (SRR) was mathematically partitioned into its growth and maintenance components for leaves of yellow-poplar (Liriodendron tulipifera L.) after 3 vr of CO2 enrichment in open-top field chambers. Despite the absence of a CO2 effect on individual leaf expansion or specific growth rate (SGR), increasing the CO2 concentration to ambient + 150 or + 300 cm3 m-3 decreased SRR by 28 to 45 % compared with ambient-grown controls. These lower leaf respiration rates were correlated with reduced leaf nitrogen concentrations. As described by the two-component model of growth and maintenance respiration, SRR was a linear function of SGR. Ambient-grown leaves had a growth respiration coefficient of 704 mg CO2 g-1 dry mass compared with 572 and 570 mg CO2 g-1 for leaves grown at the two higher CO2 concentrations. Leaves from the elevated CO2 treatments had an average maintenance respiration coefficient of 88 mg CO2 g-1 dry mass d-1 compared with 135 mg CO2 g-1 d-1 for leaves from the ambient treatment. Incorporating these growth and maintenance coefficients into a leaf growth simulation model indicated that total respiration would be reduced by 21 to 26 % for a leaf exposed to + 150 or + 300 cm3 m-3 CO2 throughout its 50-d lifespan compared with one grown at ambient CO2 conditions. Reductions in total respiration were dominated by a lower rate of maintenance respiration, while the contribution of a lower specific rate of growth respiration was largely offset by a greater dry mass for leaves grown at elevated CO2 concentrations. Although reductions in the respiratory loss of carbon could be beneficial, respiration is unlikely to decrease without a concomitant decrease in other metabolic processes. Whether these reductions are beneficial or detrimental to the long-term growth of plants exposed to elevated CO2 remains unresolved. RP WULLSCHLEGER, SD (reprint author), OAK RIDGE NATL LAB, DIV ENVIRONM SCI, POB 2008, OAK RIDGE, TN 37831 USA. RI Wullschleger, Stan/B-8297-2012; Norby, Richard/C-1773-2012 OI Wullschleger, Stan/0000-0002-9869-0446; Norby, Richard/0000-0002-0238-9828 NR 35 TC 77 Z9 82 U1 0 U2 5 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0028-646X J9 NEW PHYTOL JI New Phytol. PD AUG PY 1992 VL 121 IS 4 BP 515 EP 523 DI 10.1111/j.1469-8137.1992.tb01121.x PG 9 WC Plant Sciences SC Plant Sciences GA JL023 UT WOS:A1992JL02300002 ER PT J AU BRANDT, CA RICKARD, WH AF BRANDT, CA RICKARD, WH TI EFFECTS OF SURVEY FREQUENCY ON BIRD DENSITY ESTIMATES IN THE SHRUB-STEPPE ENVIRONMENT SO NORTHWEST SCIENCE LA English DT Article AB An assumption underlying the and use of repeated line transect surveys is that the deductibility of animals does not vary during the survey period. We conducted a line transect study of shrub-steppe birds to examine the relationship between the temporal sampling regime and the consistency of the resulting counts. Total counts of birds nesting in the sampled habitat were found to be significantly lower when sampling was repeated on a daily interval than on a weekly interval. Counts of birds not nesting in the habitat were unaffected by the sampling regime. We attribute this effect to changes in behavior of nesting birds in response to the repeated presence of the observer: western meadowlarks (Sturnella neglecta) were more likely to be silent and sage sparrows (Amphispiza belli) were probably temporarily leaving their territories when an observer reappeared on consecutive days. The temporal patterning of samples may therefore affect the mean and variability of density estimates using any of the available line-transect algorithms. RP BRANDT, CA (reprint author), PACIFIC NW LAB, DEPT ENVIRONM SCI, POB 999, RICHLAND, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU WASHINGTON STATE UNIV PI PULLMAN PA PO BOX 645910, PULLMAN, WA 99164-5910 SN 0029-344X J9 NORTHWEST SCI JI Northwest Sci. PD AUG PY 1992 VL 66 IS 3 BP 172 EP 182 PG 11 WC Ecology SC Environmental Sciences & Ecology GA JF870 UT WOS:A1992JF87000003 ER PT J AU SMOLEN, GR AF SMOLEN, GR TI SUMMARY OF CRITICAL EXPERIMENTAL-DATA FROM THE JOINT USDOE PNC CRITICALITY DATA DEVELOPMENT PROGRAM SO NUCLEAR ENERGY-JOURNAL OF THE BRITISH NUCLEAR ENERGY SOCIETY LA English DT Article AB A joint exchange programme on the subject of criticality data development was completed in August 1988. The programme was a cooperative effort between the U.S. Department of Energy and the Power Reactor and Nuclear Fuel Development Corporation of Japan. The primary purpose of the programme was to perform critical experiments to allow validation of computational methods used for safty analyses for facilities that recycle nuclear fuel. The experiments were performed with mixed Pu+U solutions in various geometries (cylinder, annular and slab) and various reflection conditions (bare, water and concrete). Also, critical lattices were assembled with Pu+U mixed-oxide fuel pins immersed in water, organic, Pu+U, and Pu+U+Gd solutions. The experiments spanned the range of neutron spectra from the very under-moderated condition (H/Pu ratio = 22) to the very over-moderated condition (H/Pu ratio = 2220). Using the criticality data provided by this programme, computational studies were performed to validate the SCALE computer code system. The good agreement between the calculational and experimental results allows the calculational method to be applied to similar plant conditions. RP SMOLEN, GR (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BRITISH NUCLEAR ENERGY SOC PI WESTMINSTER, LONDON PA 1-7 GREAT GEORGE ST, WESTMINSTER, LONDON, ENGLAND SW1P 3AA SN 0140-4067 J9 NUCL ENERG-J BR NUCL JI Nucl. Energy-J. Br. Nucl. Energy Soc. PD AUG PY 1992 VL 31 IS 4 BP 313 EP 318 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JL473 UT WOS:A1992JL47300008 ER PT J AU KOOMANOFF, FA AF KOOMANOFF, FA TI ENERGY THE ENABLER, IN OUR CHANGING WORLD SO NUCLEAR ENGINEERING AND DESIGN LA English DT Note AB Historical industrial and social development made possible by energy technologies throughout the world serves as a paradigm for looking into the future. Energy usage is directly responsible for productivity. World population is increasing rapidly necessitating still more energy. The number of college students (a measure of new ideas and demands) has also increased rapidly. The U.S. has led in energy usage and the resultant growth in transportation and communication but changes are occurring. Urbanization - another effect of energy - shows the majority of high density populations now are in developing countries. Societies are changing from single nation states to interdependent loosely-knit larger socio-economic-environmental areas - Economic Communities. Successful technology must now engage producers, users, governments, as well as communities of interest. Political management systems must recognize these changes to permit the continued development of energy technologies. Looking toward the 21st Century and our continued development in a changing world necessitates recognition of the need for a systems orientation, interdisciplinary approach to find multi-answers to problems. All must participate in the decision making process - looking for solutions (rather than identification of problems) learning together and from each other - and most importantly, managing conflict before it manages us. RP KOOMANOFF, FA (reprint author), US DOE,OFF BASIC ENERGY SCI,WASHINGTON,DC 20545, USA. NR 7 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD AUG PY 1992 VL 136 IS 1-2 BP 17 EP 21 DI 10.1016/0029-5493(92)90106-6 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JL460 UT WOS:A1992JL46000004 ER PT J AU FULKERSON, W JONES, JE AF FULKERSON, W JONES, JE TI CO2 AND THE WORLD-ENERGY SYSTEM - THE ROLE OF NUCLEAR-POWER SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 2ND SEMINAR ON SMALL AND MEDIUM-SIZED NUCLEAR REACTORS, AT THE 10TH STRUCTURAL MECHANICS IN REACTOR TECHNOLOGY CONF ( SMIRT-10 ) CY AUG 21-23, 1989 CL SAN DIEGO, CA AB The greenhouse effect, and other transnational and global environment, health and safely issues, require energy system planning on an international scale. Consideration of equity between nations and regions, particularly between the industrialized and developing countries, is an essential ingredient. For the immediate future, the next several decades at least, fossil fuels will remain the predominant energy sources. More efficient use of energy seems to be the only feasible strategy for the near to mid-term to provide growing energy services for the world economy while moderating the increasing demand for fossil fuels. In the longer term, nonfossil sources are essential for a sustainable world energy system, and nuclear power can play an important, if not dominant, role. The challenge is to design and implement a safe and economic nuclear power world enterprise which is socially acceptable and is complimentary to other nonfossil sources. The elements of such an enterprise seem clear and include: much safer reactors, preferably passively safe, which can be deployed at various scales; development of economic resource extension technologies; effective and permanent waste management strategies; and strengthened safeguards against diversion of nuclear materials to weapons. All of these elements can best be developed as cooperative international efforts. In the process, institutional improvements are equally as important as technological improvements; the two must proceed hand-in-hand. RP FULKERSON, W (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 17 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 AUG PY 1992 VL 136 IS 1-2 BP 23 EP 28 DI 10.1016/0029-5493(92)90107-7 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JL460 UT WOS:A1992JL46000005 ER PT J AU NELSON, R UNAL, C AF NELSON, R UNAL, C TI A PHENOMENOLOGICAL MODEL OF THE THERMAL HYDRAULICS OF CONVECTIVE BOILING DURING THE QUENCHING OF HOT ROD BUNDLES .1. THERMAL HYDRAULIC MODEL SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article ID FLOW REGIME TRANSITION; INVERTED ANNULAR-FLOW; HEAT-TRANSFER; DRYOUT; VISUALIZATION AB In this paper, a phenomenological model of the thermal hydraulics of convective boiling in the post-critical-heat-flux (post-CHF) regime is developed and discussed. The model was implemented in the TRAC-PF1/MOD2 computer code (an advanced best-estimate computer program written for the analysis of pressurized water reactor systems). The model was built around the determination of flow regimes downstream of the quench front. The regimes were determined from the flow-regime map suggested by Ishii and his coworkers. Heat transfer in the transition boiling region was formulated as a position-dependent model. The propagation of the CHF point was strongly dependent on the length of the transition boiling region. Wall-to-fluid film boiling heat transfer was considered to consist of two components: first, a wall-to-vapor convective heat-transfer portion and, second, a wall-to-liquid heat transfer representing near-wall effects. Each contribution was considered separately in each of the inverted annular flow (IAF) regimes. The interfacial heat transfer was also formulated as flow-regime dependent. The interfacial drag coefficient model upstream of the CHF point was considered to be similar to flow through a roughened pipe. A free-stream contribution was calculated using Ishii's bubbly flow model for either fully developed subcooled or saturated nucleate boiling. For the drag in the smooth IAF region, a simple smooth-tube correlation for the interfacial friction factor was used. The drag coefficient for the rough-wavy IAF was formulated in the same way as for the smooth IAF model except that the roughness parameter was assumed to be proportional to liquid droplet diameter entrained from the wavy interface. The drag coefficient in the highly dispersed flow regime considered the combined effects of the liquid droplets within the channel and a liquid film on wet unheated walls. The heat-transfer and interfacial drag models used were based on the flow-regime map noted above with length averaging of the flow-regime length if more than one regime existed in a give hydraulic cell. RP NELSON, R (reprint author), LOS ALAMOS NATL LAB,DIV NUCL TECHNOL & ENGN,ENGN & SAFETY ANAL GRP,MS K557,LOS ALAMOS,NM 87545, USA. NR 36 TC 9 Z9 9 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 AUG PY 1992 VL 136 IS 3 BP 277 EP 298 DI 10.1016/0029-5493(92)90029-U PG 22 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JM839 UT WOS:A1992JM83900004 ER PT J AU UNAL, C NELSON, R AF UNAL, C NELSON, R TI A PHENOMENOLOGICAL MODEL OF THE THERMAL-HYDRAULICS OF CONVECTIVE BOILING DURING THE QUENCHING OF HOT ROD BUNDLES .2. ASSESSMENT OF THE MODEL WITH STEADY-STATE AND TRANSIENT POST-CHF DATA SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB After completion of the thermal-hydraulic model developed in a companion paper, we performed developmental assessment calculations of the model using steady-state and transient post-critical heat flux (CHF) data. This paper discusses the results of those calculations. The overall interfacial drag model predicted reasonable drag coefficients for both the nucleate boiling and the inverted annular flow (IAF) regimes. The predicted pressure drops agreed reasonably well with the measured data of two transient experiments, CCTF Run 14 and a Lehigh reflood test. The thermal-hydraulic model for post-CHF convective heat transfer predicted the rewetting velocities reasonably well for both experiments. The predicted average slope of the wall temperature traces for these tests showed reasonable agreement with the measured data, indicating that the transient-calculated precursory cooling rates agreed with measured data. The hot-patch model, in conjunction with the other thermal-hydraulic models, was capable of modeling the Winfrith post-CHF hot-patch experiments. The hot-patch model kept the wall temperatures at the specified levels in the hot-patch regions and did not allow any quench-front propagation from either the bottom or the top of the test section. The interfacial heat-transfer model tended to slightly underpredict the vapor temperatures. The maximum difference between calculated and measured vapor temperatures was 20%, with a 10% difference for the remainder of the runs considered. The wall-to-fluid heat transfer was predicted reasonably well, and the predicted wall temperatures were in reasonable agreement with measured data with a maximum relative error of less than 13%. C1 LOS ALAMOS NATL LAB,DIV NUCL TECHNOL & ENGN,ENGN & SAFETY ANAL GRP,MS K557,LOS ALAMOS,NM 87545. NR 9 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 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD AUG PY 1992 VL 136 IS 3 BP 299 EP 318 DI 10.1016/0029-5493(92)90030-Y PG 20 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JM839 UT WOS:A1992JM83900005 ER PT J AU WILSON, GE WADSWORTH, DC MILLER, BG LOMMERS, L KROEGER, P OLSZEWSKI, M KOCHAN, R LIEBELT, K AF WILSON, GE WADSWORTH, DC MILLER, BG LOMMERS, L KROEGER, P OLSZEWSKI, M KOCHAN, R LIEBELT, K TI PHENOMENA-BASED THERMAL-HYDRAULIC MODELING REQUIREMENTS FOR SYSTEMS-ANALYSIS OF A MODULAR HIGH-TEMPERATURE GAS-COOLED REACTOR SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB The Modular High Temperature Gas-Cooled Reactor (MHTGR) is a candidate design for new production and commercial power nuclear reactors. The MHTGR has inherent safety features including: (1) passive shutdown and decay heat removal, (2) reduced requirements for operator intervention, thereby reducing sensitivity to operator error, and (3) long time intervals for corrective action. In support of the Department of Energy's (DOE) initial development of the design, the authors have completed an evaluation of the thermal-hydraulic phenomena that will dominate the plant response during representative normal, off-normal and accident conditions. Phenomena having significance to the plant behavior have been identified, and ranked with respect to their relative importance in satisfying operational, investment and/or safety criteria. The resulting information provides the basis for evaluating the applicability of existing computer codes, and defines the requirements for the development of new codes, for thermal-hydraulic systems analysis. The phenomena-based requirements also support the quality assurance related verification and validation of these codes. This paper briefly describes the methodology employed, and gives illustrative examples of the resulting requirements. References are cited for reports that document the full body of requirements and provide additional information for the methodology. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. OAK RIDGE NATL LAB,OAK RIDGE,TN. RP WILSON, GE (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 19 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD AUG PY 1992 VL 136 IS 3 BP 319 EP 333 DI 10.1016/0029-5493(92)90031-P PG 15 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JM839 UT WOS:A1992JM83900006 ER PT J AU HANSON, RG WILSON, GE ORTIZ, MG GRIGGS, DP AF HANSON, RG WILSON, GE ORTIZ, MG GRIGGS, DP TI DEVELOPMENT OF A PHENOMENA IDENTIFICATION AND RANKING TABLE (PIRT) FOR A POSTULATED DOUBLE-ENDED GUILLOTINE BREAK IN A PRODUCTION REACTOR SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB The U.S. Nuclear Regulatory Commission has developed a methodology to quantify the uncertainty in best estimate computer codes used to license commercial light water reactors. This methodology is equally applicable to other reactor designs with regard to providing a technical basis that supports the establishment and demonstration of compliance with safe operating margins. One of the cornerstones of the method is the identification and ranking of phenomena that are important to the postulated scenario. This paper references descriptions of the total methodology, describes the first three steps (i.e., through the identification and ranking of phenomena), and summarizes the results of the application of the methodology to a double-ended guillotine break loss of coolant accident in a production reactor. C1 EG&G IDAHO INC,IDAHO NATL ENGN LAB,MAIL STOP 2412,POB 1625 TSB,IDAHO FALLS,ID 83403. SAVANNAH RIVER ECOL LAB,WESTINGHOUSE SAVANNAH RIVER,AIKEN,SC 29808. NR 5 TC 3 Z9 3 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD AUG PY 1992 VL 136 IS 3 BP 335 EP 346 DI 10.1016/0029-5493(92)90032-Q PG 12 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JM839 UT WOS:A1992JM83900007 ER PT J AU YODER, GL CHEN, NCJ FELDE, DK NELSON, WR PAWEL, RE AF YODER, GL CHEN, NCJ FELDE, DK NELSON, WR PAWEL, RE TI THE EFFECT OF ALUMINUM CORROSION ON THE ADVANCED NEUTRON SOURCE REACTOR-FUEL DESIGN SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB The corrosion of fuel plates can have a significant impact on the performance of reactors with aluminum fuel cladding. increased fuel temperatures result when the oxide imposes an additional thermal resistance between the fuel plate and the coolant, while spallation of the oxide film may reduce cladding integrity. Characterization of oxide growth over the fuel cycle is therefore a necessary element in the design of such reactors. This paper describes the impact of fuel plate oxide formation on the Advanced Neutron Source Reactor (ANSR) core design. An oxide layer continually grows on the fuel plate surface throughout the fuel cycle. Although the cycle is short in duration (14 days), even a thin layer (< 25-mu-m) of low conductivity aluminum oxide causes a significant increase in fuel temperatures due to high ANSR power densities. The growth rate of the oxide is determined by many factors: impurities in the D2O, Coolant and oxide temperatures, heat flux, etc. Since several of these factors vary during the fuel cycle, prediction of oxide thicknesses must be time dependent. This is presently accomplished by using a series of core power density distributions calculated at different times within the fuel cycle in concert with an empirical oxidation model. Two specific thermal limits are imposed on the ANSR core design which are affected by oxide growth. A fuel centerline temperature limit of 400-degrees-C is established by fuel swelling behavior, while the oxide temperature drop is limited to 119-degrees-C to avoid oxide spallation. This paper discusses these limits and the constraints they impose on the core design. A recently developed oxide growth correlation is used in combination with thermal hydraulic analysis to show that fuel loading design can be tailored to minimize thermal limitations on the ANSR imposed by oxide growth. A power shape is presented which ideally causes a uniform oxide film to form over the entire plate surface, improving operating margins by several percent. In reality, this ideal shape cannot be obtained due to various aspects of the core: control rod movement, the time dependent nature of fuel burnup, the fuel/moderator relationship, etc. The design process is, therefore, iterative between thermal hydraulic and neutronic analyses. Results of additional calculations are presented which describe the performance of these more realistic fuel loadings and compare them to the ideal case. RP YODER, GL (reprint author), OAK RIDGE NATL LAB,POB 2009,BLDG 9204-1,MS-8045,OAK RIDGE,TN 37831, USA. NR 19 TC 0 Z9 0 U1 0 U2 3 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 AUG PY 1992 VL 136 IS 3 BP 401 EP 408 DI 10.1016/0029-5493(92)90037-V PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JM839 UT WOS:A1992JM83900012 ER PT J AU REIMAN, AH MONTICELLO, DA AF REIMAN, AH MONTICELLO, DA TI 3-DIMENSIONAL TOKAMAK EQUILIBRIA IN THE PRESENCE OF RESONANT FIELD ERRORS SO NUCLEAR FUSION LA English DT Article ID MAGNETIC ISLANDS; TEARING MODES; LOCKED MODES; PERTURBATIONS; LOCKING AB Numerical solutions are described for three-dimensional MHD equilibria in the presence of resonant magnetic field perturbations. The effects of a realistic spectrum of resonant field errors are calculated for a range of current profiles in cylindrical geometry, and the results are benchmarked against toroidal calculations for two different current profiles. It is found that field errors of the magnitude existing in present day devices, and contemplated for future devices, can produce a set of magnetic islands occupying a significant fraction of the plasma cross-section. The calculations are applicable to those situations where flow effects are unimportant. The conditions under which this is the case are discussed, and implications for several cases of interest are considered. RP REIMAN, AH (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. NR 23 TC 7 Z9 7 U1 0 U2 1 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD AUG PY 1992 VL 32 IS 8 BP 1341 EP 1350 DI 10.1088/0029-5515/32/8/I04 PG 10 WC Physics, Fluids & Plasmas SC Physics GA JN059 UT WOS:A1992JN05900004 ER PT J AU MAUEL, ME NAVRATIL, GA SABBAGH, SA BELL, MG BUDNY, RV FREDRICKSON, ED HAWRYLUK, RJ JANOS, AC JOHNSON, DW MCCUNE, DC MCGUIRE, KM MEDLEY, SS MUELLER, D OWENS, DK PARK, HK RAMSEY, AT STRATTON, BC SYNAKOWSKI, EJ TAYLOR, G WIELAND, RM ZARNSTORFF, MC KESNER, J MARMAR, ES TERRY, JL AF MAUEL, ME NAVRATIL, GA SABBAGH, SA BELL, MG BUDNY, RV FREDRICKSON, ED HAWRYLUK, RJ JANOS, AC JOHNSON, DW MCCUNE, DC MCGUIRE, KM MEDLEY, SS MUELLER, D OWENS, DK PARK, HK RAMSEY, AT STRATTON, BC SYNAKOWSKI, EJ TAYLOR, G WIELAND, RM ZARNSTORFF, MC KESNER, J MARMAR, ES TERRY, JL TI OPERATION AT THE TOKAMAK EQUILIBRIUM POLOIDAL-BETA LIMIT IN TFTR SO NUCLEAR FUSION LA English DT Letter ID PLASMA; PROFILE AB High poloidal beta (beta(p) approximately 5) discharges produced with nearly balanced tangential neutral beam injection into low current discharges in the TFTR tokamak are described. As beta(p) exceeds approximately 1.2 times the aspect ratio, a separatrix with an inside poloidal field null is observed to limit the outer boundary of the plasma. Since the curvature of TFTR's applied vertical field is constant, the appearance of the poloidal field null corresponds to the equilibrium poloidal beta limit. C1 PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544. MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139. RP MAUEL, ME (reprint author), COLUMBIA UNIV,DEPT APPL PHYS,NEW YORK,NY 10027, USA. RI Sabbagh, Steven/C-7142-2011; OI Mauel, Michael/0000-0003-2490-7478 NR 26 TC 9 Z9 9 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD AUG PY 1992 VL 32 IS 8 BP 1468 EP 1473 DI 10.1088/0029-5515/32/8/I14 PG 6 WC Physics, Fluids & Plasmas SC Physics GA JN059 UT WOS:A1992JN05900014 ER PT J AU FAUCHET, AM BISCARDI, R SINGH, O YU, LH HANNA, S STEFAN, P AF FAUCHET, AM BISCARDI, R SINGH, O YU, LH HANNA, S STEFAN, P TI LIFETIME, STABILITY AND ACCELERATOR DEVELOPMENTS AT NSLS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB In the past two years, the accelerator developments which have had a major impact on operations of the VUV and X-ray storage rings have been twofold. On the VUV ring a fourth harmonic rf cavity lengthens the electron bunch and thereby increases the Touschek limited lifetime. This results in a significant improvement in integrated current over a fill. Secondly, global analog orbit feedbacks, based on an harmonic correction scheme, have been implemented on both the VUV ring and the X-ray ring to reduce beam motion. The stabilization is done in the vertical plane in the VUV ring and in both planes in the X-ray ring. In addition, three local feedbacks are operating for X-ray ring insertion beamlines and three are being commissioned. We discuss orbit stability improvement on both rings, lifetime improvement on the VUV ring, and briefly a few selected projects under way. RP FAUCHET, AM (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 13 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 1992 VL 319 IS 1-3 BP 8 EP 17 DI 10.1016/0168-9002(92)90524-8 PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400003 ER PT J AU SAFRANEK, J WIEDEMANN, H AF SAFRANEK, J WIEDEMANN, H TI A LOW-EMITTANCE LATTICE FOR SPEAR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB The design and implementation of a low emittance lattice for the SPEAR storage ring including measurements of the performance of the lattice are presented [J. Safranek, Ph.D. thesis, Stanford University, 1991]. The low emittance lattice is designed to optimize the performance of SPEAR as a synchrotron radiation source while keeping SPEAR hardware changes at a minimum. The horizontal emittance of the electron beam in the low emittance lattice is reduced by a factor of 4 from the previous lattice. This reduces the typical horizontal source size and divergence of the photon beams by a factor of 2 each and increases the photon beam brightness. At 3 GeV the horizontal emittance is 129-pi nm rad, which makes the low emittance lattice the lowest emittance, running synchrotron radiation source in the world in the 1.5 to 4.0 GeV energy range for the emittance scaled to 3 GeV. The measured vertical emittance was reduced to half that typically seen at SPEAR in the past. The brightness of the photon beams was further increased by reducing beta(y) at the insertion devices to 1.1 m and reducing the energy dispersion at the insertion devices by more than a factor of 2 on average. The horizontal dispersion at the rf cavities was reduced by a factor of nearly 4 which gives much less problems with synchrobetatron resonances. The dynamic and physical apertures of the lattice are large, giving long beam lifetimes and easy injection of electrons. The measurements of the linear optics and intensity dependent phenomena gave reasonable agreement with the design. The overall performance of the machine was very good. Injection rates of 10 to 20 mA/min and larger were achieved routinely, and 100 mA total current was stored. Repeated ramping of stored beam from the injection energy of 2.3 GeV to the running energy of 3.0 GeV was achieved with very little beam loss. This low emittance configuration is expected to be the operating configuration for SPEAR starting in January 1992. C1 STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94305. RP SAFRANEK, J (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 15 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 18 EP 24 DI 10.1016/0168-9002(92)90525-9 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400004 ER PT J AU HULBERT, SL WEBER, JM AF HULBERT, SL WEBER, JM TI FLUX AND BRIGHTNESS CALCULATIONS FOR VARIOUS SYNCHROTRON RADIATION SOURCES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB Simple expressions for flux, central intensity, vertical opening angle, effective source size (horizontal and vertical), and brightness of bending magnets and ordinary planar insertion devices (undulators and wigglers) on synchrotron radiation (SR) storage rings are compiled. These expressions are evaluated for existing SR sources at the National Synchrotron Light Source (NSLS) and planned SR sources at the Advanced Light Source (ALS) and the Advanced Photon Source (APS). All necessary storage ring and insertion device parameters are listed in tables. The flux, central intensity, and brightness of all of the calculated SR sources are plotted for comparison. RP HULBERT, SL (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 3 TC 10 Z9 10 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 25 EP 31 DI 10.1016/0168-9002(92)90526-A PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400005 ER PT J AU MILLS, DM AF MILLS, DM TI THE ADVANCED PHOTON SOURCE - A STATUS-REPORT SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB The Advanced Photon Source (APS) currently under construction at Argonne National Laboratory is scheduled for completion in early 1996. Both conventional facilities construction and technical component fabrication is well under way. An update on the current state of civil construction as well as progress on storage ring and beamline technical component development will be presented. User activities have also proceeded at a rapid pace, particularly over the last year. In response to a call for proposals for sectors, the APS received proposals for over 20 sectors from prospective Collaborative Access Teams (CATs). It is anticipated that beamline construction in the experiment hall could begin in approximately 18 months. RP MILLS, DM (reprint author), ARGONNE NATL LAB,ADV PHOTON SOURCE,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 13 TC 1 Z9 1 U1 1 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 33 EP 39 DI 10.1016/0168-9002(92)90527-B PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400006 ER PT J AU ROBINSON, AL SCHLACHTER, AS AF ROBINSON, AL SCHLACHTER, AS TI SCIENTIFIC PROGRAM OF THE ADVANCED LIGHT-SOURCE AT LBL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV ID SYNCHROTRON AB Construction of the Advanced Light Source (ALS) at the Lawrence Berkeley Laboratory is nearing completion, with operation as a US Department of Energy national user facility scheduled to begin in the spring of 1993. Based on a low-emittance, 1.5 GeV electron storage ring with ten long straight sections available for insertion devices and, initially, 24 bend-magnet ports, the ALS will be a third-generation source of soft X-ray and ultraviolet (collectively, the XUV) synchrotron radiation. Experimental facilities (insertion devices, beamlines, and end stations) will be developed and operated by participating research teams working with the ALS staff. The ability to exploit the high spectral brightness of the ALS was the main criterion for PRT selection. In the XUV spectral regions served by the ALS, a major benefit of high brightness will be the ability to achieve spatial resolution in the neighborhood of 200 angstrom in X-ray microscopy and holography and in spatially resolved spectroscopy. Other beneficiaries of high brightness include very-high-resolution spectroscopy, spectroscopy of dilute species, diffraction from very small samples, and time-resolved spectroscopy and diffraction. RP ROBINSON, AL (reprint author), LAWRENCE BERKELEY LAB,ADV LIGHT SOURCE,BERKELEY,CA 94720, USA. NR 6 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 40 EP 46 DI 10.1016/0168-9002(92)90528-C PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400007 ER PT J AU SOUTHWORTH, SH COWAN, PL AF SOUTHWORTH, SH COWAN, PL TI X-RAY-BEAM POSITION MONITOR USING A QUADRANT PIN DIODE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV ID SYNCHROTRON RADIATION BEAMLINE; HIGH-ENERGY-RESOLUTION; FEEDBACK-SYSTEM; PHOTOELECTRON; MONOCHROMATOR; DETECTORS; FLUX AB We report on the use of a quadrant PIN silicon photodiode as a position monitor of the monochromatized X-ray beam in a synchrotron radiation beamline. Signal levels corresponding to the horizontal and vertical beam positions and to the total intensity intercepted are derived simultaneously. The detector is demonstrated to be quite sensitive to the angular and translational motion of the X-ray beam arising from movement of beamline optical components. Use of the detector to obtain diagnostic information and as a position sensor in feedback loops is discussed. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP SOUTHWORTH, SH (reprint author), NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899, USA. NR 18 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 51 EP 55 DI 10.1016/0168-9002(92)90530-H PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400009 ER PT J AU SHU, D RODRICKS, B BARRAZA, J SANCHEZ, T KUZAY, TM AF SHU, D RODRICKS, B BARRAZA, J SANCHEZ, T KUZAY, TM TI THE APS X-RAY UNDULATOR PHOTON-BEAM POSITION MONITOR AND TESTS AT CHESS AND NSLS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB The advent of third generation synchrotron radiation sources, like the Advanced Photon Source (APS), will provide significant increases in brilliance over existing synchrotron sources. The APS X-ray undulators will increase the brilliance in the 3-40 keV range by several orders of magnitude. Thus, the design of the photon beam position monitor is a challenging engineering task. The beam position monitors must withstand the high thermal load, be able to achieve submicron spatial resolution while maintaining their stability, and be compatible with both undulators and wigglers. A preliminary APS prototype photon beam position monitor consisting of a CVD-diamond-based, tungsten-coated blade was tested on the APS/CHESS undulator at the Cornell High Energy Synchrotron Radiation Source (CHESS) and on the NSLS X-13 undulator beamline. Results from these tests, as well as the design of this prototype APS photon beam position monitor, will be discussed in this paper. RP SHU, D (reprint author), ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439, USA. NR 8 TC 17 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 56 EP 62 DI 10.1016/0168-9002(92)90531-8 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400010 ER PT J AU SHU, D BARRAZA, J SANCHEZ, T NIELSEN, RW COLLINS, JT KUZAY, TM AF SHU, D BARRAZA, J SANCHEZ, T NIELSEN, RW COLLINS, JT KUZAY, TM TI FRONT END DESIGNS FOR THE 7-GEV ADVANCED PHOTON SOURCE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB The conceptual designs for the insertion device (ID) and bending magnet (BM) front ends have been completed for the 7 GeV Advanced Photon Source (APS) under construction at Argonne National Laboratory. These designs satisfy the generic front end functions. However, the high power and high heat fluxes imposed by the X-ray sources of the 7 GeV APS have presented various design engineering challenges for the front end. Consideration of such challenges and their solutions have led to novel and advanced features including modularized systems, enhanced heat transfer concepts in the fixed mask and the photon shutter designs, a radiation safety philosophy based on multiple photon shutters for a fail-safe operation, a submicron resolution beam position monitor for beam monitoring and ring feedback information, and minimal beam filtering concepts to deliver maximized beam power and spectra to the experimenters. The criteria and special features of the front end design are discussed in this paper. RP SHU, D (reprint author), ADV PHOTON SOURCE,ARGONNE,IL 60439, USA. NR 12 TC 9 Z9 10 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 63 EP 70 DI 10.1016/0168-9002(92)90532-9 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400011 ER PT J AU WANG, ZB SHU, DM KUZAY, TM AF WANG, ZB SHU, DM KUZAY, TM TI VIBRATION ANALYSIS OF THE PHOTON SHUTTER DESIGNED FOR THE ADVANCED PHOTON SOURCE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB The photon shutter is a critical component of the beamline front end for the 7 GeV Advanced Photon Source (APS) project, now under construction at Argonne National Laboratory (ANL). The shutter is designed to close in tens of milliseconds to absorb up to 10 kW heat load (with high heat flux). Our shutter design uses innovative enhanced heat transfer tubes to withstand the high heat load. Although designed to be lightweight and compact, the very fast movement of the shutter gives rise to concern regarding vibration and dynamic sensitivity. To guarantee long-term functionality and reliability of the shutter, the dynamic behavior should be fully studied. In this paper, the natural frequency and transient dynamic analysis for the shutter during operation are presented. Through analysis of the vibration characteristics, as well as stress and deformation, several options in design were developed and compared, including selection of materials for the shutter and structural details. RP WANG, ZB (reprint author), ARGONNE NATL LAB,DIV EXPTL FACIL,ADV PHOTON SOURCE,9700 S CASS AVE,ARGONNE,IL 60439, USA. 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 71 EP 76 DI 10.1016/0168-9002(92)90533-A PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400012 ER PT J AU WARWICK, T HEIMANN, P AF WARWICK, T HEIMANN, P TI NOVEL CHARACTERISTICS OF VUV INSERTION DEVICE BEAMLINES AT THE ADVANCED LIGHT-SOURCE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB The design of VUV beamlines for the Advanced Light Source is discussed. Features of the design serve to illustrate the careful attention required in order to preserve the performance of the low emittance "third-generation" storage ring, operating with insertion devices. RP WARWICK, T (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 14 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 1992 VL 319 IS 1-3 BP 77 EP 82 DI 10.1016/0168-9002(92)90534-B PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400013 ER PT J AU NUHN, HD TATCHYN, R WINICK, H FISHER, AS GALLARDO, JC PELLEGRINI, C AF NUHN, HD TATCHYN, R WINICK, H FISHER, AS GALLARDO, JC PELLEGRINI, C TI SHORT WAVELENGTH FELS ON LARGE STORAGE-RINGS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV ID FREE-ELECTRON LASER; SOFT-X-RAY; OPTICAL KLYSTRON; GAIN; RADIATION; OPERATION; PEP AB The use of a large-circumference, high-energy, electron-positron collider such as PEP, TRISTAN or PETRA to drive a free-electron laser (FEL), producing high levels of coherent power at short wavelengths around 40 angstrom is explored. We consider self-amplified spontaneous emission (SASE), in which electron bunches with low emittance, high peak current and small energy spread radiate coherently in a single pass through a long undulator. As the electron beam passes down the undulator, its interaction with the increasingly intense spontaneous radiation causes a bunch density modulation at the optical wavelength, resulting in stimulated emission and exponential growth of coherent power in a single pass. The need for optical-cavity mirrors, which place a lower limit on the wavelength of a conventional FEL oscillator, is avoided. Various combinations of electron-beam and undulator parameters, as well as special undulator designs, are discussed. Saturation and high peak, in-band, coherent power (460 MW) are possible with a 67 m, hybrid permanent-magnet undulator in a ring bypass. A 100 m, cusp-field undulator can achieve high average, in-band, coherent power (0.25 W) in the main ring. The existing, 25.6 m, Paladin undulator at LLNL, with the addition of optical-klystron dispersive sections, is considered for both peak and average power. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. RP NUHN, HD (reprint author), STANFORD SYNCHROTRON RADIAT LAB,SLAC,BIN 69,POB 4349,STANFORD,CA 94309, USA. OI Gallardo, Juan C/0000-0002-5191-3067 NR 36 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 89 EP 96 DI 10.1016/0168-9002(92)90536-D PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400015 ER PT J AU CARNEGIE, DW TIMPF, J AF CARNEGIE, DW TIMPF, J TI CHARACTERIZING PERMANENT-MAGNET BLOCKS WITH HELMHOLTZ COILS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB Most of the insertion devices to be installed at the Advanced Photon Source will utilize permanent magnets in their magnetic structures. The quality of the spectral output is sensitive to the errors in the field of the device which are related to variations in the magnetic properties of the individual blocks. The Advanced Photon Source will have a measurement facility to map the field in the completed insertion devices and equipment to test and modify the magnetic strength of the individual magnet blocks. One component of the facility, the Helmholtz coil permanent magnet block measurement system, has been assembled and tested. This system measures the total magnetic moment vector of a block with a precision better than 0.01% and a directional resolution of about 0.05-degrees. The design and performance of the system will be presented. RP CARNEGIE, DW (reprint author), ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60438, USA. NR 0 TC 3 Z9 4 U1 0 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 97 EP 99 DI 10.1016/0168-9002(92)90537-E PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400016 ER PT J AU RANDALL, KJ EBERHARDT, W FELDHAUS, J ERLEBACH, W BRADSHAW, AM XU, Z JOHNSON, PD MA, Y AF RANDALL, KJ EBERHARDT, W FELDHAUS, J ERLEBACH, W BRADSHAW, AM XU, Z JOHNSON, PD MA, Y TI NSLS X1B - AN UNDULATOR BEAMLINE FOR HIGH-RESOLUTION SOFT-X-RAY SPECTROSCOPY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID K-SHELL EXCITATION; MONOCHROMATORS AB The X1 undulator on the X-ray ring of the NSLS at Brookhaven is an extremely bright source of soft X-ray photons. On the recently completed spectroscopy beamline X1B we have attempted to utilise the intrinsically narrow beam size and divergence to maximise the intensity throughput in a spherical grating monochromator (SGM). The high power density of the undulator radiation requires the use of water cooled mirrors, entrance slit and grating. Calculations predict that simple side cooled copper pads attached to optical elements will be sufficiently effective that resolution degradation due to thermal deformation of figure error will be negligible in the SGM design. This is confirmed by attainment of resolution superior to other SGMs and the BESSY SX700-II monochromator over the energy range 300-540 eV (C1s-1, N1s-1 and O1s-1). At a resolution comparable to the best so far obtained for the nitrogen N1s-pi* excitation (401 eV) on other monochromators we have demonstrated an intensity increase, at the sample, of more than three orders of magnitude. The design considerations upon which beamline X1B is based are highly relevant to thc construction of soft X-ray monochromators at future synchrotron radiation sources such as the ALS (Berkeley), Elettra (Trieste) and BESSYII (Berlin). C1 PACIFIC NW LAB, MSRC, RICHLAND, WA 99352 USA. BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. EXXON CORP RES LABS, FLORHAM PK, NJ 07932 USA. FORSCHUNGSZENTRUM JULICH, W-5170 JULICH 1, GERMANY. RP RANDALL, KJ (reprint author), MAX PLANCK GESELL, FRITZ HABER INST, W-1000 BERLIN 33, GERMANY. RI Feldhaus, Josef/C-1130-2014 NR 16 TC 16 Z9 16 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 101 EP 105 DI 10.1016/0168-9002(92)90538-F PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400017 ER PT J AU HEIMANN, P WARWICK, T HOWELLS, M MCKINNEY, W DIGENNARO, D GEE, B YEE, D KINCAID, B AF HEIMANN, P WARWICK, T HOWELLS, M MCKINNEY, W DIGENNARO, D GEE, B YEE, D KINCAID, B TI THE ADVANCED LIGHT-SOURCE U8 BEAM LINE, 20-300 EV SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB The U8 is a beam line under construction at the Advanced Light Source (ALS). The beam line will be described along with calculations of its performance and its current status. An 8 cm period undulator is followed by two spherical collecting mirrors, an entrance slit, spherical gratings having a 15-degrees deviation angle, a moveable exit slit, and refocusing and branching mirrors. Internal water cooling is provided to the metal MI and M2 mirrors as well as to the gratings. Calculations have been made of both the flux output and the resolution over its photon energy range of 20-300 eV. The design goal was to achieve high intensity, 10(12) photons/s, at a high resolving power of 10 000. The U8 participating research team (PRT) is planning experiments involving the photoelectron spectroscopy of gaseous atoms and molecules, the spectroscopy of ions and actinide spectroscopy. RP HEIMANN, P (reprint author), LAWRENCE BERKELEY LAB,ADV LIGHT SOURCE,BERKELEY,CA 94720, USA. RI McKinney, Wayne/F-2027-2014 OI McKinney, Wayne/0000-0003-2586-3139 NR 9 TC 20 Z9 22 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 106 EP 109 DI 10.1016/0168-9002(92)90539-G PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400018 ER PT J AU KOIKE, M AF KOIKE, M TI BEAM SPLITTING OF UNDULATOR RADIATION WITH VARIABLE SPACING PLANE GRATING MONOCHROMATOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV ID SYNCHROTRON RADIATION; DESIGN AB Design options are discussed for beamline branching which permits the simultaneous use of an undulator radiation at two end stations. The schemes include a novel use of a variable spacing plane grating with (1) a partially inserted mirror, (2) a pop-up or a sector-type plane mirror, and (3) a traveling plane mirror with simultaneous rotation. Also discussed are the expected performance, advantages, and disadvantages of the various systems. RP KOIKE, M (reprint author), LAWRENCE BERKELEY LAB,CTR XRAY OPT,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 1992 VL 319 IS 1-3 BP 135 EP 140 DI 10.1016/0168-9002(92)90544-E PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400023 ER PT J AU CHAPMAN, D HASTINGS, J MOULIN, H SIDDONS, DP GARRETT, RF NACHALIEL, E DILMANIAN, FA AF CHAPMAN, D HASTINGS, J MOULIN, H SIDDONS, DP GARRETT, RF NACHALIEL, E DILMANIAN, FA TI MEASUREMENT OF ROCKING CURVE WINGS AT HIGH X-RAY-ENERGIES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB Measurements done recently at the NSLS have indicated that the level of intensity found in the wings of diffraction peaks from silicon at higher X-ray energies ( > 20 keV) far exceeds the value which would be predicted based on the dynamical theory. We have measured Si(220) double crystal rocking curves at the 40 keV fundamental and harmonics with various crystal scattering geometries: Bragg-Bragg, Laue-Bragg, Laue-Laue. The comparison of the Bragg and Laue case diffraction geometries was done to determine scattering volume effects. Comparisons with dynamical theory calculations will be discussed. These measurements have been carried out in order to assess the level of harmonic contamination which will be present from a double crystal monochromator being designed for the X17 superconducting wiggler beamline. C1 BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. RP CHAPMAN, D (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. RI Elleaume, Helene/F-2554-2013 NR 5 TC 3 Z9 3 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 1992 VL 319 IS 1-3 BP 149 EP 154 DI 10.1016/0168-9002(92)90546-G PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400025 ER PT J AU MACRANDER, AT LEE, WK AF MACRANDER, AT LEE, WK TI MISALIGNMENT SENSITIVITY OF AN INCLINED-CRYSTAL MONOCHROMATOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB The sensitivity of a novel inclined-crystal monochromator design to misalignments has been calculated, and compared to data. Rocking curve narrowing as well as broadening can occur because the asymmetry factor of dynamical diffraction given by b = s0.n/s(H).n can have an absolute value larger or smaller than unity. Here s0.n and s(H).n are the direction cosines of the incident and diffracted beams, respectively, and n is the inward surface normal. An inclined double crystal monochromator that is perfectly aligned would have b = -1 for both crystals, and only then would the diffraction be symmetric. We have computed b and rocking curve widths for inclination angles of 70.53-degrees and 85.00-degrees- and we compare the 70.53-degrees case to data for silicon {111} reflections using 8 keV (Cu K-alpha) radiation. The 70.53-degrees case applies to (111BAR) reflection from a (111) oriented crystal. We report that rotations around the reciprocal lattice vector have the expected effect on b. RP MACRANDER, AT (reprint author), ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439, USA. NR 2 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 155 EP 157 DI 10.1016/0168-9002(92)90547-H PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400026 ER PT J AU LEE, WK MACRANDER, AT AF LEE, WK MACRANDER, AT TI MODIFICATIONS OF THE BEAM PROFILE IN THE NEW INCLINED CRYSTAL GEOMETRY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB The new inclined crystal geometry has been successfully used in high load X-ray monochromator tests. The important aspect of this geometry is that from a diffraction point of view, when properly aligned, it is a symmetric Bragg reflection; i.e., b = k(i).n/k(out).n = -1. An interesting result of this geometry is that with a single reflection from an inclined crystal the output X-ray beam shape changes dramatically, while maintaining the same beam cross sectional area. For example, a parallel 8 keV input X-ray beam using Si(111) reflection, with an inclination angle of 70.5-degrees, the output beam size is compressed by about a factor of 5.6 in one direction and expanded by the same factor in the other direction. This geometry can therefore be used to alter the source line profile of in house X-ray generators, and in some cases to better match the sample size and the X-ray beam. The effect of this geometry on beam profiles, beam divergences and acceptance angles will be discussed. RP LEE, WK (reprint author), ARGONNE NATL LAB,ADV PHOTON SOURCE,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 7 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 1992 VL 319 IS 1-3 BP 158 EP 162 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400027 ER PT J AU MCKINNEY, WR IRICK, SC LUNT, DLJ AF MCKINNEY, WR IRICK, SC LUNT, DLJ TI WATER COOLED METAL OPTICS FOR THE ADVANCED LIGHT-SOURCE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB The program for providing water cooled metal optics for the Advanced Light Source at Berkeley is reviewed with respect to fabrication and metrology of the surfaces. Materials choices, surface figure and smoothness specifications, and metrology systems for measuring the plated metal surfaces are discussed. Results from prototype mirrors and grating blanks will be presented, which show exceptionally low microroughness and midperiod error. We will briefly describe our improved version of the long trace profiler, and its importance to our metrology program. We have completely redesigned the mechanical, optical and computational parts of the profiler system with the cooperation of P. Takacs of Brookhaven, Continental Optical, and Baker Manufacturing. Most important is that one of our profilers is in use at the vendor to allow testing during fabrication. Metrology from the first water cooled mirror for an ALS beamline is presented as an example. This 15 in. long Glidcop(TM) mirror is coated with electroless nickel from Acteron Corporation in Redwood City, CA. The preplating processing and grinding and polishing were done by Tucson Optical. We will show significantly better surface microroughness on electroless nickel, over large areas, than has been reported previously. C1 TUCSON OPT RES CORP,TUCSON,AZ. RP MCKINNEY, WR (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI McKinney, Wayne/F-2027-2014 OI McKinney, Wayne/0000-0003-2586-3139 NR 10 TC 5 Z9 5 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 179 EP 184 DI 10.1016/0168-9002(92)90551-E PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400030 ER PT J AU WARWICK, T SHARMA, S AF WARWICK, T SHARMA, S TI THERMAL EFFECTS AND MIRROR SURFACE FIGURE REQUIREMENTS FOR A DIAGNOSTIC BEAMLINE AT THE ADVANCED LIGHT-SOURCE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB An imaging beamline based on a Kirkpatrick-Baez mirror configuration has been designed to image the electron beam in the ALS storage ring, to measure its size and shape. The electron beam emittance will be small (epsilon(h) = 3.4 x 10(-9) m rad) and the quality of the image is extremely sensitive to surface figure distortion of the mirrors. Thermal distortions and surface temperatures have been calculated for radiatively cooled mirrors of various materials in a search for a simple design which avoids water cooling. The choice of mirror material and the thermal and mechanical design is discussed. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP WARWICK, T (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 185 EP 187 DI 10.1016/0168-9002(92)90552-F PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400031 ER PT J AU MACRANDER, AT LEE, WK SMITHER, RK MILLS, DM ROGERS, CS KHOUNSARY, AM AF MACRANDER, AT LEE, WK SMITHER, RK MILLS, DM ROGERS, CS KHOUNSARY, AM TI HIGH HEAT LOAD PERFORMANCE OF AN INCLINED-CRYSTAL MONOCHROMATOR WITH LIQUID GALLIUM COOLING ON THE CHESS-ANL UNDULATOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB Results for the performance of a novel double crystal monochromator subjected to high heat loads from an APS prototype undulator at the Cornell high energy synchrotron source (CHESS) are presented. The monochromator was designed to achieve symmetric diffraction from Bragg planes that are inclined relative to the surface. The angle of incidence can be made small in the inclined arrangement thereby lowering the power density incident on the surface of the crystal. Both crystals had (111) oriented surfaces and were arranged such that the beam was diffracted from the (111BAR) planes at 5 keV. Rocking curves with minimal distortion were obtained at a ring electron current of 96 mA. This corresponded to 379 W total power and a peak power density of 48 W/mm2 transverse to the incident beam. These results are compared to data obtained from the same crystals in the standard arrangement (diffracting planes parallel to surface). The footprint area in the inclined case was 3 times that of the standard case. We also obtained rocking curve data for the {333} reflection at 15 keV for both the standard and inclined cases, and these data also showed a minimal distortion for the inclined case. In addition, thermal data were obtained via infrared pyrometry. Not only the diffraction data but also the thermal data revealed a dramatically improved performance for the inclined-crystal case. RP MACRANDER, AT (reprint author), ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439, USA. NR 13 TC 29 Z9 29 U1 1 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 188 EP 196 DI 10.1016/0168-9002(92)90553-G PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400032 ER PT J AU NIAN, HLT SHENG, ICA KUZAY, TM AF NIAN, HLT SHENG, ICA KUZAY, TM TI THERMAL-ANALYSIS OF A PHOTON SHUTTER FOR APS FRONT ENDS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB The photon shutter is one of the critical elements on the front end of the beamlines at the Advanced Photon Source (APS) now under construction at Argonne National Laboratory (ANL). The conceptual design of the photon shutter uses an enhanced heat transfer tube developed at ANL. Due to large thermal loads on the shutter, inclined geometry is used in the design to spread the footprint of the X-ray beam. Even then, thermal loads are very critical. To address the thermal and thermomechanical issues, analytical studies have been applied to a simplified model of the shutter tube. Both closed-form solutions and ANSYS finite element analysis are conducted using both a uniform and a Gaussian heat flux. Results for maximum deflections and stresses are obtained and compared with the available stress/fatigue data for the materials proposed for the shutter design. RP NIAN, HLT (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 6 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 1992 VL 319 IS 1-3 BP 197 EP 206 PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400033 ER PT J AU DEJUS, RJ KHOUNSARY, AM BROWN, DA VICCARO, PJ AF DEJUS, RJ KHOUNSARY, AM BROWN, DA VICCARO, PJ TI CALCULATION OF WIGGLER SPECTRUM AND ITS ABSORPTION IN MEDIA SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV ID POWER AB The thermal and structural analyses of beamline and optical components exposed to high heat loads from insertion devices at the third generation synchrotron radiation facilities often require accurate determination's of the absorbed power profile. We have extended the existing PHOTON program (which calculates bending magnet spectra and their absorption in media) to the wiggler regime by taking into account the softening of the energy spectrum as the beam is observed off-axis in the horizontal direction. We describe a model for the wiggler power density and the total power in terms of commonly used parameters. Primarily using Wiggler B at the Advanced Photon Source (APS) as the model source, we find an absorbed power profile in a beryllium window that is markedly different from the power profile of the wiggler source itself. the absorbed power density increases rather than decreases in the horizontal direction. This finding may have a significant impact on the design of windows and other beamline components exposed to high heat load from insertion devices. C1 UNIV DELAWARE,DEPT PHYS & ASTRON,NEWARK,DE 19716. RP DEJUS, RJ (reprint author), ARGONNE NATL LAB,DIV EXPTL FACIL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 12 TC 6 Z9 6 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 207 EP 212 DI 10.1016/0168-9002(92)90555-I PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400034 ER PT J AU GLUSKIN, E MCNULTY, I VICCARO, PJ HOWELLS, MR AF GLUSKIN, E MCNULTY, I VICCARO, PJ HOWELLS, MR TI X-RAY-INTENSITY INTERFEROMETER FOR UNDULATOR RADIATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB Intensity interferometry is well established with visible light but has never been demonstrated with X-radiation. We propose to measure the transverse coherence of an X-ray beam using the method of Hanbury Brown and Twiss. The X-ray interferometer consists of an array of slits, a grazing incidence reflective beam splitter, a pair of fast multichannel plate detectors and a broadband, low-noise correlator circuit. The NSLS X1 or X13 soft X-ray undulator will supply the partially coherent X-rays. We are developing this technique to characterize the coherence properties of X-ray beams from high brilliance insertion devices at third-generation synchrotron light facilities such as the Advanced Photon Source and the Advanced Light Source. C1 LAWRENCE BERKELEY LAB,ADV LIGHT SOURCE,BERKELEY,CA 94720. RP GLUSKIN, E (reprint author), ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439, USA. NR 18 TC 9 Z9 9 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 1992 VL 319 IS 1-3 BP 213 EP 218 DI 10.1016/0168-9002(92)90556-J PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400035 ER PT J AU NAMIOKA, T KOIKE, M AF NAMIOKA, T KOIKE, M TI ANALYTICAL REPRESENTATION OF SPOT DIAGRAMS AND ITS APPLICATION TO THE DESIGN OF MONOCHROMATORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV ID GRATINGS AB A new method has been developed for the design of a highly sophisticated Monochromator equipped with a holographic or a ruled grating with variable spacing and curved grooves. The method utilizes analytical expression of the spot diagrams, as well as a merit function which closely represents the rms spread of the spots formed when an infinite number of rays are traced. Unlike other design methods based on the light path function, the present method takes into account all the possible aberrations (up to third order) in spectral images, the ruled area, and the slit height. Also given are design examples of a high-resolution VUV monochromator. C1 LAWRENCE BERKELEY LAB,CTR X RAY OPT,BERKELEY,CA 94720. RP NAMIOKA, T (reprint author), NASA,GODDARD SPACE FLIGHT CTR,UNIV SPACE RES ASSOC,MC 7171,GREENBELT,MD 20771, USA. NR 12 TC 17 Z9 18 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 1992 VL 319 IS 1-3 BP 219 EP 227 DI 10.1016/0168-9002(92)90557-K PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400036 ER PT J AU GMUR, NF AF GMUR, NF TI BORON-NITRIDE PROTECTIVE COATING OF BERYLLIUM WINDOW SURFACES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB A commercially available boron nitride aerosol has been found to protect white X-ray beamline beryllium windows, whose surfaces are exposed to atmosphere, from contamination and degradation. The physical characteristics and chemical makeup of the aerosol are described. The results of studies on a variety of beamlines at the NSLS show that certain experimental configurations benefit from this protective coating. RP GMUR, NF (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 12 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 228 EP 232 DI 10.1016/0168-9002(92)90558-L PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400037 ER PT J AU KHOUNSARY, AM KUZAY, TM AF KHOUNSARY, AM KUZAY, TM TI ON DIAMOND WINDOWS FOR HIGH-POWER SYNCHROTRON X-RAY-BEAMS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV ID RADIATION AB Recent advances in chemical vapor deposition (CVD) technology have made available thin, free-standing polycrystalline diamond foils that can be used as the window material on high heat load synchrotron X-ray beamlines. Diamond windows have many advantages that stem from the exceptionally attractive thermal, structural, and physical properties of diamond. Numerical simulations indicate that diamond windows can offer an attractive and at times the only alternative to beryllium windows for use on the third generation X-ray synchrotron radiation beamlines. Utilization, design, and fabrication aspects of diamond windows for high heat load X-ray beamlines are discussed, and analytical and numerical results are presented to provide a basis for the design and testing of such windows. RP KHOUNSARY, AM (reprint author), ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439, USA. NR 8 TC 3 Z9 3 U1 2 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 1992 VL 319 IS 1-3 BP 233 EP 239 DI 10.1016/0168-9002(92)90559-M PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400038 ER PT J AU WARBURTON, WK PIANETTA, P AF WARBURTON, WK PIANETTA, P TI INSITU OPTICAL-ELEMENT CLEANING WITH PHOTON ACTIVATED OXYGEN SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV ID SYNCHROTRON RADIATION; CARBON CONTAMINATION; GRATINGS; SURFACES; MIRRORS AB The severe flux losses seen in synchrotron radiation beamlines due to carbon contamination of optical surfaces has stimulated a search for decontamination techniques to restore these surfaces to their pristine efficiencies. In situ techniques are preferred for their potential for minimizing labor and beamline downtime costs. Glow discharge activated O2, with or without additions of H2O, has been the most successful procedure to date and is capable of cleaning the surfaces without degrading their optical properties provided the system is properly designed and operated. The method is scarcely ideal, however, since real possibilities for contamination from the discharges exist, considerable instrument modification may be required to allow plasma access to the optics, and total cycle times are 1-3 days, which may be a significant operating cost on new, ultrahigh intensity beamlines. In this work we demonstrate the existence of a new in situ decontamination technique, presenting initial work showing that synchrotron radiation itself can sufficiently activate dry oxygen to successfully remove carbon contamination films. This technique offers particular promise in two areas. First, used in situ, the cleaning action takes place in exactly the same places where contamination occurs, since both processes are activated by the same radiation, and no instrument modifications are required. Second, it suggests that if the optical elements were continuously exposed to oxygen at an appropriate partial pressure, carbon contamination could be suppressed completely. We are now planning experiments to understand the physics, chemistry and kinetics of this new decontamination technique. C1 SSRL,SLAC BIN 69,STANFORD,CA 94309. RP WARBURTON, WK (reprint author), X RAY INSTRUMENTAT ASSOCIATES,1300 MILLS ST,MENLO PK,CA 94025, USA. NR 14 TC 6 Z9 9 U1 0 U2 5 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 240 EP 243 DI 10.1016/0168-9002(92)90560-Q PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400039 ER PT J AU JOHNSON, PD AF JOHNSON, PD TI SPIN DEPENDENT ELECTRON SPECTROSCOPIES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV ID X-RAY DICHROISM; SYNCHROTRON RADIATION; POLARIZATION ANALYZER; INVERSE PHOTOEMISSION; FE(001); FE; SURFACE; DIFFRACTION; ABSORPTION; ADSORPTION AB The use of synchrotron radiation in the study of the electronic properties of magnetic systems is now becoming widespread. New compact spin detectors have allowed extensive studies of both the valence bands and core levels of clean ferromagnetic surfaces, adsorbates on the same surfaces, and thin films. Photon energy dependencies allow the identification of two dimensional magnetic states in both surface and interface regions. The core level studies allow information to be obtained about the local magnetic structure. The development of new techniques for the study of magnetic properties dependent on the polarization of the light is also discussed. Thus in certain experiments the use of circularly polarized light has an advantage that no spin detector is required. RP JOHNSON, PD (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 44 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 264 EP 270 DI 10.1016/0168-9002(92)90564-K PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400043 ER PT J AU TERMINELLO, LJ WADDILL, GD TOBIN, JG AF TERMINELLO, LJ WADDILL, GD TOBIN, JG TI HIGH-RESOLUTION PHOTOABSORPTION AND CIRCULAR-POLARIZATION MEASUREMENTS ON THE UNIVERSITY-OF-CALIFORNIA NATIONAL LABORATORY SPHERICAL GRATING MONOCHROMATOR BEAMLINE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV ID RAY; DICHROISM AB We have measured the N, C, and O1s photoabsorption of O2, N2 and CO using the University of California/National Laboratory bend magnet beamline located at the Stanford Synchrotron Radiation Laboratory. The photon-energy resolving power at the N1s edge ranges from 8-12.5 x 10(3) based upon the vibrationally resolved 1s-pi* transition, indicating that this spherical grating monochromator is one of the highest-resolution soft-X-ray/ultraviolet photon sources yet reported. Magnetic circular dichroism was also measured with this beamline on highly magnetized thin films. Left and right elliptically polarized soft X-rays were produced by collecting the synchrotron radiation above or below the plane of the electron ring. RP TERMINELLO, LJ (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Tobin, James/O-6953-2015 NR 15 TC 19 Z9 19 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 271 EP 276 DI 10.1016/0168-9002(92)90565-L PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400044 ER PT J AU PERERA, RCC AF PERERA, RCC TI PHOTON EXCITATION FOR SATELLITE-FREE X-RAY SPECTROSCOPY - INSTRUMENTATION CHALLENGES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV ID SYNCHROTRON RADIATION BEAMLINE; HIGH-ENERGY-RESOLUTION; PHOTOELECTRON-SPECTRA; EMISSION-SPECTRA; CHLOROFLUOROMETHANES; FLUORESCENCE; ELECTRON AB Soft X-ray emission spectra (SXES) obtained using monochromatic synchrotron radiation (SR) provides important advantages as compared with electron excitation. Photons can penetrate deep into the sample providing nondestructive information from bulk samples. With availability of tunable monochromatic photons from synchrotron sources, it is now possible to selectively ionize core electrons near enough to the core level threshold energy producing singly ionized atoms and molecules resulting in satellite-free X-ray emission spectra. This offers the ability to separate satellite structure from diagram lines and also allows more detailed studies of the satellite processes. Recent developments in satellite-free SXES will be reviewed along with instrumentation challenges in utilizing the small phase-space attributes of high brightness from third-generation SR sources producing soft X-ray and vacuum ultraviolet wavelengths. RP PERERA, RCC (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 31 TC 11 Z9 11 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 277 EP 284 DI 10.1016/0168-9002(92)90566-M PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400045 ER PT J AU THOMLINSON, W AF THOMLINSON, W TI MEDICAL APPLICATIONS OF SYNCHROTRON RADIATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV ID CORONARY ANGIOGRAPHY; ENHANCEMENT; MICROSCOPE; DETECTOR AB Ever since the first diagnostic X-ray was done in the United States on February 3, 1896, the application of ionizing radiation to the field of medicine has become increasingly important. Both in clinical medicine and basic research the use of X-rays for diagnostic imaging and radiotherapy is now widespread. Radiography angiography, CAT and PETT scanning, mammography, and nuclear medicine are all examples of technologies developed to image the human anatomy. In therapeutic applications, both external and internal sources of radiation are applied to the battle against cancer. The development of dedicated synchrotron radiation sources has allowed exciting advances to take place in many of these applications. The new sources provide tunable, high-intensity monochromatic beams over a wide range of energies which can be tailored to specific programmatic needs. This paper surveys those areas of medical research in which synchrotron radiation facilities are actively involved. RP THOMLINSON, W (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 37 TC 23 Z9 23 U1 1 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 295 EP 304 DI 10.1016/0168-9002(92)90569-P PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400048 ER PT J AU NACHALIEL, E DILMANIAN, FA GARRETT, RF THOMLINSON, WC CHAPMAN, LD GMUR, NF LAZARZ, NM MOULIN, HR RIVERS, ML RARBACK, H STEFAN, PM SPANNE, P LUKE, PN PEHL, R THOMPSON, AC MILLER, M AF NACHALIEL, E DILMANIAN, FA GARRETT, RF THOMLINSON, WC CHAPMAN, LD GMUR, NF LAZARZ, NM MOULIN, HR RIVERS, ML RARBACK, H STEFAN, PM SPANNE, P LUKE, PN PEHL, R THOMPSON, AC MILLER, M TI MONOCHROMATIC COMPUTED-TOMOGRAPHY OF THE HUMAN BRAIN USING SYNCHROTRON X-RAYS - TECHNICAL FEASIBILITY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV ID RADIATION AB A monochromatic computed tomography (CT) scanner is being developed at the X17 superconducting wiggler beamline at the National Synchrotron Light Source (NSLS), Brookhaven National Laboratory, to image the human head and neck. The system configuration is one of a horizontal fan beam and an upright seated rotating subject. The purposes of the project are to demonstrate improvement in the image contrast and in the image quantitative accuracy that can be obtained in monochromatic CT and to apply the system to specific clinical research programs in neuroradiology. This paper describes the first phantom studies carried out with a prototype system, using the dual photon absorptiometry (DPA) method at energies of 20 and 38 keV. The results show that improvements in image contrast and quantitative accuracy are possible with monochromatic DPA CT. Estimates of the clinical performance of the planned CT system are made on the basis of these initial results. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. ANAL CORP,PEABODY,MA 01960. RP NACHALIEL, E (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Elleaume, Helene/F-2554-2013; Chapman, Dean/I-6168-2013 OI Chapman, Dean/0000-0001-6590-4156 NR 15 TC 17 Z9 17 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 1992 VL 319 IS 1-3 BP 305 EP 310 DI 10.1016/0168-9002(92)90570-T PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400049 ER PT J AU THOMPSON, AC CHAPMAN, KL ICE, GE SPARKS, CJ YUN, W LAI, B LEGNINI, D VICARRO, PJ RIVERS, ML BILDERBACK, DH THIEL, DJ AF THOMPSON, AC CHAPMAN, KL ICE, GE SPARKS, CJ YUN, W LAI, B LEGNINI, D VICARRO, PJ RIVERS, ML BILDERBACK, DH THIEL, DJ TI FOCUSING OPTICS FOR A SYNCHROTRON-BASED X-RAY MICROPROBE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB X-ray microprobe experiments at third-generation synchrotron sources will provide trace element of samples with 1 1-mu-m x 1-mu-m spatial resolution and femtogram sensitivity. For these experiments to be possible, X-ray optical elements need to be developed to focus the beam from a hard X-ray undulator to a micron spot size. In June 1991 several different optical elements were tested during a dedicated undulator run at CHESS. The undulator produced radiation similar to that which will be available at third-generation sources like the Advanced Photon Source. Both Fresnel zone plates and multilayer-coated spherical mirrors were tested. With the Fresnel zone plate a spot size of 8.5-mu-m x 30-mu-m was achieved in the first order and 6-mu-m x 20-mu-m in the second order. With a Kirkpatrick-Baez multilayer mirror system a spot size of 4-mu-m x 9-mu-m was achieved. Based on these results, some of the requirements for an optical system suitable for a dedicated microprobe beamline are given. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV CHICAGO,CHICAGO,IL 60637. CORNELL UNIV,SCH APPL & ENGN PHYS,ITHACA,NY 14853. RP THOMPSON, AC (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 9 TC 20 Z9 20 U1 1 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 320 EP 325 DI 10.1016/0168-9002(92)90572-L PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400051 ER PT J AU EBERT, PJ AF EBERT, PJ TI APPLICATION OF NUCLEAR-PARTICLE TRACKS - A SCANNING-X-RAY MICROSCOPE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV ID WAVELENGTH; LIGHT AB The scanning X-ray microscope (SXM) is a short wavelength analog of a near-field optical-scanning microscope, promising spatial resolution of approximately 100 angstrom up to approximately 5 keV X-ray energy. A portion of a synchrotron X-ray beam streams through an etched nuclear particle track in an opaque membrane and impinges on an object within the narrow stream. Scattered or transmitted X-rays are detected with a photon counter. The SXM is feasible because a useful number of synchrotron X-rays, even from a bend magnet, will stream through a small diameter pore. The properties and limitations of the SXM are discussed together with other submicroscopic applications of nuclear particle tracks. RP EBERT, PJ (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 14 TC 0 Z9 0 U1 2 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 326 EP 332 DI 10.1016/0168-9002(92)90573-M PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400052 ER PT J AU MOELLER, KD SEARS, T LIU, HT HIRSCHMUGL, CJ WILLIAMS, GP AF MOELLER, KD SEARS, T LIU, HT HIRSCHMUGL, CJ WILLIAMS, GP TI A HIGH-RESOLUTION INTERFEROMETER FOR USE WITH SYNCHROTRON RADIATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB We present the first results from a new instrument which is designed to work at very high resolution in the infrared spectral region but whose principles can be used in the VuV/soft-X-ray region. The instrument is based on an interferometer. For the VUV/soft-X-ray region the beamsplitting is achieved by wavefront division which takes advantage of the spatial coherence of synchrotron radiation. Normally the highest frequency in the spectrum from an interferometer is determined by the sampling frequency, which has to be at least twice that of the highest frequency in the spectrum. We show that this can be avoided if the spectral range is deliberately restricted by a grating or by the use of an undulator. In this case the interferograms contain a known and restricted range of frequencies which lead to an unambiguous assignment during the Fourier processing required to generate the spectrum. C1 NEW JERSEY INST TECHNOL,NEWARK,NJ 07102. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP MOELLER, KD (reprint author), FAIRLEIGH DICKINSON UNIV,DEPT PHYS,TEANECK,NJ 07666, USA. RI Sears, Trevor/B-5990-2013 OI Sears, Trevor/0000-0002-5559-0154 NR 6 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 1992 VL 319 IS 1-3 BP 384 EP 386 DI 10.1016/0168-9002(92)90582-O PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400061 ER PT J AU STAHLE, CK OSHEROFF, D KELLEY, RL MOSELEY, SH SZYMKOWIAK, AE AF STAHLE, CK OSHEROFF, D KELLEY, RL MOSELEY, SH SZYMKOWIAK, AE TI ADAPTING CALORIMETRIC X-RAY-DETECTORS FOR COMPTON-SCATTERING EXPERIMENTS PERFORMED AT HIGH-ENERGIES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV ID HIGH-RESOLUTION SPECTROSCOPY; THERMAL DETECTORS; SUPERCONDUCTORS; SPECTROMETERS; QUASIPARTICLE AB Motivated by the need for improved resolution in Compton scattering experiments performed with high energy X-rays, we have developed a high resolution spectrometer. We have adapted calorimetric X-ray detectors, produced at Goddard Space Flight Center for X-rays around 6 keV, to Compton scattering research using synchrotron radiation near 40 keV. Such a detector is operated below 0.1 K and determines X-ray energies by measuring the temperature increase which results from the absorption of a single X-ray photon. We have investigated a number of materials as candidates for the overlayer which is affixed to a device in order to absorb the X-rays and transfer their energy to phonons. Using Sn absorbers, we have achieved a resolution of 90 eV at 32 keV. The apparatus was brought to a wiggler beam line at the Stanford Synchrotron Radiation Laboratory, where we were able to measure Compton profiles of Si for the (100) and (111) directions. The difference reproduced the previously measured anisotropy, but the measurement was limited by the low number of total counts and by a degradation in resolution experienced during operation at the synchrotron. This experiment illustrates the feasibility of using such a system for Compton scattering research. We expect that future improvements to the detectors and to the supporting apparatus will make higher resolution measurements possible. C1 STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305. RP STAHLE, CK (reprint author), NASA,GODDARD SPACE FLIGHT CTR,CODE 666,GREENBELT,MD 20771, USA. RI Kelley, Richard/K-4474-2012 NR 13 TC 6 Z9 6 U1 2 U2 5 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 393 EP 399 DI 10.1016/0168-9002(92)90584-Q PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400063 ER PT J AU FURENLID, LR KRANER, HW ROGERS, LC CRAMER, SP STEPHANI, D BEUTTENMULLER, RH BEREN, J AF FURENLID, LR KRANER, HW ROGERS, LC CRAMER, SP STEPHANI, D BEUTTENMULLER, RH BEREN, J TI THE NSLS-100 ELEMENT SOLID-STATE ARRAY DETECTOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB X-ray absorption studies of dilute samples require fluorescence detection techniques. Since signal-to-noise ratios are governed by the ratio of fluorescent to scattered photons counted by a detector, solid state detectors which can discriminate between fluorescence and scattered photons have become the instruments of choice for trace element measurements. Commercially available 13 element Ge array detectors permitting total count rates < 500000 counts per second are now in routine use. Since X-ray absorption beamlines at high brightness synchrotron sources can already illuminate most dilute samples with enough flux to saturate the current generation of solid state detectors, the development of next-generation instruments with significantly higher total count rates is essential. We present the design and current status of the 100 element Si array detector being developed in a collaboration between the NSLS and the Instrumentation Division at Brookhaven National Laboratory. The detecting array consists of a 10 x 10 matrix of 4 mm x 4 mm elements laid out on a single piece of ultrahigh purity silicon mounted at the front end of a liquid nitrogen dewar assembly. A matrix of charge sensitive integrating preamplifiers feed signals to an array of shaping amplifiers, single channel analyzers, and scalers. An electronic switch, delay amplifier, linear gate, digital scope, peak sensing A/D converter, and histogramming memory module provide for complete diagnostics and channel calibration. The entire instrument is controlled by a LabView 2 application on a MacII ci; the software also provides full control over beamline hardware and performs the data collection. C1 UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA 95616. RP FURENLID, LR (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. FU NIBIB NIH HHS [P41 EB002035] NR 8 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 AUG 1 PY 1992 VL 319 IS 1-3 BP 408 EP 413 DI 10.1016/0168-9002(92)90586-S PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400065 PM 26722135 ER PT J AU PIETRASKI, PJ AF PIETRASKI, PJ TI 4 CHANNEL-V CONVERTER TO F-CONVERTER WITH FREQUENCY COUNTERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH NATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY OCT 28-31, 1991 CL LOUISIANA STATE UNIV, BATON ROUGE, LA SP MAXWELL LABS, BROBECK DIV HO LOUISIANA STATE UNIV AB A high linearity four channel voltage to frequency converter has been developed for general purpose beamline data collection The full scale frequency output for each channel is 1 or 2 MHZ. Inputs are differential and input voltage ranges are independently selectable to various unipolar and bipolar ranges. Each channel is also equipped with a 7 1/2 digit frequency counter with independently selectable gate times. The entire unit is packaged in a single width NIM module. RP PIETRASKI, PJ (reprint author), BROOKHAVEN NATL LAB,NSLS,UPTON,NY 11973, USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 1992 VL 319 IS 1-3 BP 414 EP 416 DI 10.1016/0168-9002(92)90587-T PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JF674 UT WOS:A1992JF67400066 ER PT J AU YACOUT, AM LAM, NQ STUBBINS, JF AF YACOUT, AM LAM, NQ STUBBINS, JF TI RADIATION-INDUCED PRECIPITATION AT THE ALLOY SURFACE DURING ION-BOMBARDMENT SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID INDUCED SEGREGATION; TERNARY ALLOYS AB A kinetic approach to model radiation-induced formation of a precipitate layer on the surface of a binary alloy during ion bombardment is described. Sample calculations were performed for the case of Ni3Si coating on a Ni-Si alloy surface. The strong coupling between Si atoms and radiation-generated defect fluxes causes a significant Si enrichment at the surface, which gives rise to the formation of a precipitate layer when it exceeds the Si solubility limit. The stability of this layer depends on the competition between the rates of precipitation and sputtering. Both the receding surface and the moving precipitate/matrix interface were accounted for by means of a mathematical scheme of boundary immobilization. The dependences of the precipitation kinetics and the development of solute concentration profiles in the alloy matrix on bombardment temperature, ion flux and alloy composition were examined. C1 ARGONNE NATL LAB,MSD-212,ARGONNE,IL 60439. UNIV ILLINOIS,URBANA,IL 61801. NR 14 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD AUG PY 1992 VL 71 IS 2 BP 148 EP 154 DI 10.1016/0168-583X(92)95315-I PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JJ969 UT WOS:A1992JJ96900005 ER PT J AU TALBERT, WL HSU, HH PRENGER, FC AF TALBERT, WL HSU, HH PRENGER, FC TI BEAM HEATING AND COOLING OF THICK TARGETS FOR ONLINE PRODUCTION OF EXOTIC NUCLEI SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON ELECTROMAGNETIC ISOTOPE SEPARATORS AND TECHNIQUES RELATED TO THEIR APPLICATIONS ( EMIS-12 ) CY SEP 02-06, 1991 CL SENDAI, JAPAN SP TOHOKU UNIV, CYCLOTRON & RADIOISOTOPE CTR, GEN COMM AB Calculations have been made of energy deposition distributions for "thick" targets (approximately 1 mole/cm2) employed in on-line production of exotic nuclei using the Monte Carlo based LAHET code system for high-energy charged particle transport. A variety of target materials and incident proton beam energies have been examined. For 600 MeV protons, the results are compared to those from a similar study reported in the literature. The agreement between the two studies for total energy deposition is reasonably good for monatomic targets, but the results differ in some details of the energy deposition distributions. Target cooling, both radiative and conductive, is examined to assess the suitability of existing target concepts exposed to bombardment by intense (up to 100-mu-A), energetic (500 MeV to 1.2 GeV) proton beams to produce exotic nuclei. Implications of cooling requirements to target material selection and design are discussed. RP TALBERT, WL (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 7 TC 12 Z9 12 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 AUG PY 1992 VL 70 IS 1-4 BP 175 EP 181 DI 10.1016/0168-583X(92)95928-K PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JK468 UT WOS:A1992JK46800033 ER PT J AU GEISSEL, H ARMBRUSTER, P BEHR, KH BRUNLE, A BURKARD, K CHEN, M FOLGER, H FRANCZAK, B KELLER, H KLEPPER, O LANGENBECK, B NICKEL, F PFENG, E PFUTZNER, M ROECKL, E RYKACZEWSKI, K SCHALL, I SCHARDT, D SCHEIDENBERGER, C SCHMIDT, KH SCHROTER, A SCHWAB, T SUMMERER, K WEBER, M MUNZENBERG, G BROHM, T CLERC, HG FAUERBACH, M GAIMARD, JJ GREWE, A HANELT, E KNODLER, B STEINER, M VOSS, B WECKENMANN, J ZIEGLER, C MAGEL, A WOLLNIK, H DUFOUR, JP FUJITA, Y VIEIRA, DJ SHERRILL, B AF GEISSEL, H ARMBRUSTER, P BEHR, KH BRUNLE, A BURKARD, K CHEN, M FOLGER, H FRANCZAK, B KELLER, H KLEPPER, O LANGENBECK, B NICKEL, F PFENG, E PFUTZNER, M ROECKL, E RYKACZEWSKI, K SCHALL, I SCHARDT, D SCHEIDENBERGER, C SCHMIDT, KH SCHROTER, A SCHWAB, T SUMMERER, K WEBER, M MUNZENBERG, G BROHM, T CLERC, HG FAUERBACH, M GAIMARD, JJ GREWE, A HANELT, E KNODLER, B STEINER, M VOSS, B WECKENMANN, J ZIEGLER, C MAGEL, A WOLLNIK, H DUFOUR, JP FUJITA, Y VIEIRA, DJ SHERRILL, B TI THE GSI PROJECTILE FRAGMENT SEPARATOR (FRS) - A VERSATILE MAGNETIC SYSTEM FOR RELATIVISTIC HEAVY-IONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON ELECTROMAGNETIC ISOTOPE SEPARATORS AND TECHNIQUES RELATED TO THEIR APPLICATIONS ( EMIS-12 ) CY SEP 02-06, 1991 CL SENDAI, JAPAN SP TOHOKU UNIV, CYCLOTRON & RADIOISOTOPE CTR, GEN COMM ID MOMENTUM-LOSS ACHROMAT; ISOTOPIC-SEPARATION; ATOMIC-COLLISIONS; CHARGE-STATE; DISTRIBUTIONS; SPECTROMETER; GANIL; LISE AB The projectile fragment separator FRS designed for research and applied studies with relativistic heavy ions was installed at GSI as a part of the new high-energy SIS/ESR accelerator facility. This high-resolution forward spectrometer has been successfully used in first atomic and nuclear physics experiments using neon, argon, krypton, xenon, and gold beams in the energy range from 500 to 2000 MeV/u. For the first time relativistic xenon and gold fragments have been isotopically separated. In this contribution we describe first experiments characterizing the performance of this spectrometer. C1 TH DARMSTADT,INST KERNPHYS,W-6100 DARMSTADT,GERMANY. UNIV GIESSEN,W-6300 GIESSEN,GERMANY. CEN BORDEAUX,F-33175 BORDEAUX,FRANCE. OSAKA UNIV,COLL GEN EDUC,TOYONAKA,OSAKA 560,JAPAN. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NSCL,E LANSING,MI 48824. RP GEISSEL, H (reprint author), GESELL SCHWERIONENFORSCH GMBH,W-6100 DARMSTADT,GERMANY. RI Sherrill, Bradley/B-4098-2009; Sherrill, Bradley/B-3378-2011; Schardt, Dieter/M-1517-2014 OI Schardt, Dieter/0000-0001-7851-5993 NR 43 TC 726 Z9 732 U1 4 U2 21 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 AUG PY 1992 VL 70 IS 1-4 BP 286 EP 297 DI 10.1016/0168-583X(92)95944-M PG 12 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JK468 UT WOS:A1992JK46800049 ER PT J AU MATSUTA, K OZAWA, A NOJIRI, Y MINAMISONO, T FUKUDA, M KITAGAWA, A OHTSUBO, T MOMOTA, S FUKUDA, S MATSUO, Y TAKECHI, H MINAMI, I SUGIMOTO, K TANIHATA, I OMATA, K SHIMOURA, S ALONSO, JR KREBS, GF SYMONS, TJM AF MATSUTA, K OZAWA, A NOJIRI, Y MINAMISONO, T FUKUDA, M KITAGAWA, A OHTSUBO, T MOMOTA, S FUKUDA, S MATSUO, Y TAKECHI, H MINAMI, I SUGIMOTO, K TANIHATA, I OMATA, K SHIMOURA, S ALONSO, JR KREBS, GF SYMONS, TJM TI A FRAGMENT SEPARATOR AT LBL FOR THE BETA-NMR EXPERIMENT SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON ELECTROMAGNETIC ISOTOPE SEPARATORS AND TECHNIQUES RELATED TO THEIR APPLICATIONS ( EMIS-12 ) CY SEP 02-06, 1991 CL SENDAI, JAPAN SP TOHOKU UNIV, CYCLOTRON & RADIOISOTOPE CTR, GEN COMM ID PROJECTILE AB The Beam 44 fragment separator was built at the Bevalac of LBL for NMR studies of beta emitting nuclei. K-37, Ca-39, and Ti-43 fragments originating from Ca-40 and Ti-46 primary beams were separated by the separator for NMR studies on these nuclei. Nuclear spin polarization was created in Ca-39 and Ti-43 using the tilted foil technique (TFT), and the magnetic moment of Ti-43 was deduced. Fragment polarization was measured for K-37 and Ca-39 emitted to finite deflection angles. The Beam 44 fragment separator in combination with a proper polarization technique, such as TFT or fragment polarization, has been very effective for such NMR studies. C1 RIKEN,WAKO,SAITAMA 35101,JAPAN. UNIV TOKYO,TANASHI,TOKYO 188,JAPAN. UNIV TOKYO,BUNKYO KU,TOKYO 113,JAPAN. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP MATSUTA, K (reprint author), OSAKA UNIV,TOYONAKA,OSAKA 560,JAPAN. RI Shimoura, Susumu/E-8692-2012 OI Shimoura, Susumu/0000-0003-4741-2865 NR 10 TC 7 Z9 7 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 AUG PY 1992 VL 70 IS 1-4 BP 304 EP 308 DI 10.1016/0168-583X(92)95946-O PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JK468 UT WOS:A1992JK46800051 ER PT J AU COLE, JD CORMIER, TM HAMILTON, JH RAMAYYA, AV AF COLE, JD CORMIER, TM HAMILTON, JH RAMAYYA, AV TI A RECOIL MASS-SPECTROMETER FOR HHIRF SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON ELECTROMAGNETIC ISOTOPE SEPARATORS AND TECHNIQUES RELATED TO THEIR APPLICATIONS ( EMIS-12 ) CY SEP 02-06, 1991 CL SENDAI, JAPAN SP TOHOKU UNIV, CYCLOTRON & RADIOISOTOPE CTR, GEN COMM ID NUCLEAR-REACTION; SEPARATOR AB A recoil mass spectrometer (RMS) is to be built that will carry out a broad research program in heavy-ion science at the Holifield Heavy Ion Research Facility at Oak Ridge, Tennessee. The RMS will make possible the study of otherwise inaccessible exotic nuclei. Careful attention has been given to match the RMS to all the beams available from the HHIRF accelerators, including those beams with the highest energy as well as massive particles for use in inverse reactions. The RMS is to be a momentum achromat followed by a split electric dipole mass spectrometer of the type operating at NSRL at the University of Rochester. The RMS is essential for many of the proposed experiments on short lived and/or low cross section products. The spectrometer design will be discussed, with attention paid to the aberrations present and their corrections. C1 TEXAS A&M UNIV SYST,DEPT PHYS,COLL STN,TX 77840. TEXAS A&M UNIV SYST,INST CYCLOTRON,COLL STN,TX 77840. VANDERBILT UNIV,DEPT PHYS & ASTRON,NASHVILLE,TN 37325. RP COLE, JD (reprint author), IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 20 TC 30 Z9 30 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 AUG PY 1992 VL 70 IS 1-4 BP 343 EP 357 DI 10.1016/0168-583X(92)95950-V PG 15 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JK468 UT WOS:A1992JK46800055 ER PT J AU DAVIDS, CN BACK, BB BINDRA, K HENDERSON, DJ KUTSCHERA, W LAURITSEN, T NAGAME, Y SUGATHAN, P RAMAYYA, AV WALTERS, WB AF DAVIDS, CN BACK, BB BINDRA, K HENDERSON, DJ KUTSCHERA, W LAURITSEN, T NAGAME, Y SUGATHAN, P RAMAYYA, AV WALTERS, WB TI STARTUP OF THE FRAGMENT MASS ANALYZER AT ATLAS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON ELECTROMAGNETIC ISOTOPE SEPARATORS AND TECHNIQUES RELATED TO THEIR APPLICATIONS ( EMIS-12 ) CY SEP 02-06, 1991 CL SENDAI, JAPAN SP TOHOKU UNIV, CYCLOTRON & RADIOISOTOPE CTR, GEN COMM AB The Fragment Mass Analyzer (FMA) is currently being brought into operation at the Argonne Tandem Linear Accelerator System (ATLAS). The FMA is a recoil mass spectrometer, 8 m in length, which will be used to separate nuclear reaction products from the primary beam and disperse them by mass/charge (m/q) at the focal plane. It has a solid angle of 8 msr, an energy acceptance of +/- 20% around the central energy, and an m/q acceptance of +/- 7% around the central mass. The FMA will allow the study of gamma rays originating from weak fusion-reaction channels by gating the gamma spectra by the desired ion identified at the FMA focal plane. Production and decay of nuclei far from stability will be studied at the FMA focal plane by implanting exotic recoils directly into detectors or by using a fast tape system to transport the recoils to shielded detector systems. With its capability of rotating from - 5 to + 45-degrees around the target, the FMA will also be used for reaction mechanism studies. Beta-NMR and nuclear moment measurements will be made behind the focal plane. A facility description and a progress report on the commissioning of the FMA are presented. RP DAVIDS, CN (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. RI Pullanhiotan, Sugathan/C-4453-2017 OI Pullanhiotan, Sugathan/0000-0001-5773-2008 NR 6 TC 258 Z9 259 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD AUG PY 1992 VL 70 IS 1-4 BP 358 EP 365 DI 10.1016/0168-583X(92)95951-M PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JK468 UT WOS:A1992JK46800056 ER PT J AU DAVIDS, CN AF DAVIDS, CN TI ENERGY COMPENSATION OF AN ISOLDE-TYPE ISOTOPE SEPARATOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON ELECTROMAGNETIC ISOTOPE SEPARATORS AND TECHNIQUES RELATED TO THEIR APPLICATIONS ( EMIS-12 ) CY SEP 02-06, 1991 CL SENDAI, JAPAN SP TOHOKU UNIV, CYCLOTRON & RADIOISOTOPE CTR, GEN COMM AB The placement of an electric dipole following the magnet in an ISOLDE-type isotope separator can compensate for the energy dispersion introduced by the magnet. This allows the injection into such a separator of ion beams with energy spreads of up to +/- 3% at mass A = 120, an order of magnitude larger than previously possible. Calculations are presented applying this technique to an IGISOL (ion guide isotope separator on-line) facility, where such energy spreads occur under the conditions where the highest yields are available. RP DAVIDS, CN (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 11 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 AUG PY 1992 VL 70 IS 1-4 BP 435 EP 440 DI 10.1016/0168-583X(92)95961-P PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JK468 UT WOS:A1992JK46800066 ER PT J AU TROTSCHER, J BALOG, K EICKHOFF, H FRANCZAK, B FRANZKE, B FUJITA, Y GEISSEL, H KLEIN, C KNOLLMANN, J KRAFT, A LOBNER, KEG MAGEL, A MUNZENBERG, G PRZEWLOKA, A ROSENAUER, D SCHAFER, H SENDOR, M VIEIRA, DJ VOGEL, B WINKELMANN, T WOLLNIK, H AF TROTSCHER, J BALOG, K EICKHOFF, H FRANCZAK, B FRANZKE, B FUJITA, Y GEISSEL, H KLEIN, C KNOLLMANN, J KRAFT, A LOBNER, KEG MAGEL, A MUNZENBERG, G PRZEWLOKA, A ROSENAUER, D SCHAFER, H SENDOR, M VIEIRA, DJ VOGEL, B WINKELMANN, T WOLLNIK, H TI MASS MEASUREMENTS OF EXOTIC NUCLEI AT THE ESR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON ELECTROMAGNETIC ISOTOPE SEPARATORS AND TECHNIQUES RELATED TO THEIR APPLICATIONS ( EMIS-12 ) CY SEP 02-06, 1991 CL SENDAI, JAPAN SP TOHOKU UNIV, CYCLOTRON & RADIOISOTOPE CTR, GEN COMM ID SEPARATORS AB We plan to measure masses of exotic nuclei far from the valley of beta-stability using the Experimental Storage Ring (ESR) at GSI, Darmstadt, as a time-of-flight (TOF), multi-turn mass spectrometer. For this purpose the ring must be tuned to an isochronous mode, so that the flight time per turn of an ion depends only on its mass-to-charge ratio and not on its velocity spread. For these measurements the timing detector is planned to be placed directly into the ESR to record each circulating ion. C1 MUNCHEN UNIV,SEKT PHYS,W-8048 GARCHING,GERMANY. GESELL SCHWERIONENFORSCH GMBH,W-6100 DARMSTADT,GERMANY. OSAKA UNIV,COLL GEN EDUC,TOYONAKA,OSAKA 560,JAPAN. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP TROTSCHER, J (reprint author), UNIV GIESSEN,INST PHYS 2,W-6300 GIESSEN,GERMANY. NR 12 TC 58 Z9 58 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD AUG PY 1992 VL 70 IS 1-4 BP 455 EP 458 DI 10.1016/0168-583X(92)95965-T PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JK468 UT WOS:A1992JK46800070 ER PT J AU WESTON, LW TODD, JH AF WESTON, LW TODD, JH TI HIGH-RESOLUTION FISSION CROSS-SECTION MEASUREMENTS OF U-235 AND PU-239 SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID NEUTRON AB The fission cross sections of U-235 and Pu-239 are measured with very high neutron energy resolution (0.17 ns/m) in the energy region from 100 to 2000 eV for U-235 and to 20000 eV for Pu-239. The purpose of this measurement is to provide fission cross sections with energy resolution comparable with that available from transmission measurements for the purpose of deriving multilevel resolved resonance parameters. Fission ion chambers are used to detect fission fragments, and a B-10 ionization chamber is used to measure the relative neutron flux at the 86-m flight path of the Oak Ridge Electron Linear Accelerator. The measured fission cross sections are the highest resolution measurements of good accuracy reported in the neutron energy range above 400 eV. RP WESTON, LW (reprint author), OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,POB 2008,OAK RIDGE,TN 37831, USA. NR 14 TC 6 Z9 6 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 AUG PY 1992 VL 111 IS 4 BP 415 EP 421 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JF760 UT WOS:A1992JF76000007 ER PT J AU MADNI, IK GUO, XD AF MADNI, IK GUO, XD TI MELCOR MODELING OF THE NATIONAL RESEARCH UNIVERSAL FULL-LENGTH HIGH-TEMPERATURE-2 EXPERIMENT SO NUCLEAR TECHNOLOGY LA English DT Article DE FLHT-2 EXPERIMENT; COMPARISONS; MELCOR ANALYSIS AB The MELCOR computer code has been used to simulate the National Research Universal full-length high-temperature 2 (FLHT-2) test. Input data for the analysis were obtained from the FLHT-2 test Data Report and from SCDAP input. Results are presented for the transient liquid level in the test bundle, heat transfer to the bypass flow, cladding and shroud temperatures, and hydrogen generation. Comparisons are made with experimental data and with SCDAP calculations. Several sensitivity calculations with MELCOR, which explore the impact of varying user-input modeling and time-step control parameters on the predicted behavior, were also carried out. RP MADNI, IK (reprint author), BROOKHAVEN NATL LAB,DEPT NUCL ENERGY,DIV SAFETY & RISK EVALUAT,BLDG 130,UPTON,NY 11973, USA. NR 10 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD AUG PY 1992 VL 99 IS 2 BP 203 EP 212 PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JE456 UT WOS:A1992JE45600007 ER PT J AU CHINN, CR PICKLESIMER, A AF CHINN, CR PICKLESIMER, A TI OFF-SHELL AND MEDIUM EFFECTS ON THE ELECTROMAGNETIC NUCLEON CURRENT SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article DE INELASTIC ELECTRON SCATTERING TO CONTINUUM ID QUASIELASTIC ELECTRON-SCATTERING; RANDOM-PHASE-APPROXIMATION; COULOMB SUM-RULE; LONGITUDINAL RESPONSE FUNCTION; FINAL-STATE INTERACTIONS; MISSING CHARGE PROBLEM; ELASTIC-SCATTERING; FORM-FACTORS; REACTION C-12(E,E'P); E,E'P REACTION AB Ambiguities in the nuclear electromagnetic current operator within the nuclear medium are used to examine the significance of the off-shell form of the current operator for the ease of Ca-40. The standard form of the electromagnetic current operator and two alternate forms, one of which is the popular de Forest prescription, are used to study current operator ambiguities in the context of the quasi-elastic (e, e') and (e, e'p) reactions in the presence of realistic final-state interactions. Nucleons may themselves be modified in the nuclear medium and the associated modification of the current operator, which has been modelled through the use of density-dependent form factors, is studied here in the (e, e'p) reaction. For the quasi-elastic inclusive reaction we find large current-operator-dependent effects in both the longitudinal and transverse response. For the transverse response these effects are clearly linked to the nature of the final-state interactions and are traced to virtual pair processes present in the relativistic case. In particular, the de Forest current yields a greatly enhanced transverse response and a large high-energy tail in the relativistic case. Current operator ambiguities do not seriously affect Coulomb Sum Rule saturation trends and produce less dramatic effects for the exclusive (e, e'p) reaction. Our results suggest that present knowledge of the nucleon electromagnetic current operator is insufficient to allow firm predictions of the electronuclear reactions to be made to the precision required to resolve other physical issues. C1 LOS ALAMOS NATL LAB, DIV PHYS, LOS ALAMOS, NM 87545 USA. RP CHINN, CR (reprint author), CTR ETUD BRUYERES LE CHATEL, SERV PHYS & TECH NUCL, BP 12, F-91680 BRUYERES LE CHATEL, FRANCE. NR 72 TC 12 Z9 12 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD AUG PY 1992 VL 105 IS 8 BP 1149 EP 1177 DI 10.1007/BF02730873 PG 29 WC Physics, Particles & Fields SC Physics GA JX600 UT WOS:A1992JX60000009 ER PT J AU STEINMAN, AD AF STEINMAN, AD TI DOES AN INCREASE IN IRRADIANCE INFLUENCE PERIPHYTON IN A HEAVILY-GRAZED WOODLAND STREAM SO OECOLOGIA LA English DT Article DE HERBIVORY; LIGHT LIMITATION; PERIPHYTON; SNAILS; STREAMS ID LABORATORY STREAMS; ALGAL ASSEMBLAGES; COMMUNITY STRUCTURE; GRAZING MINNOWS; NUTRIENT; LIGHT; RESPONSES; DYNAMICS; PRODUCTIVITY; PHOSPHORUS AB Irradiance level and grazer density were manipulated in a factorial design to examine the relative effects of biotic and abiotic factors on periphyton biomass, productivity, and taxonomic structure in a heavily grazed, woodland stream. Irradiance levels were increased from 0.26 to 12.42 mol quanta/m2/d by placing metal halide lamps over the stream. The major grazer in this system was the prosobranch snail Elimia clavaeformis. Its densities were reduced from ca. 750 individuals/m2 to near zero by raising platforms off the stream bottom. Experimental treatments were maintained for 48 days. Biomass-specific carbon fixation rates increased significantly in response to higher light levels, indicating that periphyton communities were light-limited at this time of year. However, positive effects of irradiance on areal-specific carbon fixation and biomass were detected only when grazer density was reduced. Basal cells of the chlorophyte Stigeoclonium dominated communities exposed either to low light or high grazing pressure. When light was increased and grazer density reduced, large or upright diatoms became more abundant. Results from this study indicated that limitation of periphyton photosynthesis could be mitigated by increasing the levels of an abiotic resource (light) to this system, but that periphyton biomass was controlled by biotic interactions. RP STEINMAN, AD (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,BLDG 1504,OAK RIDGE,TN 37831, USA. OI Steinman, Alan/0000-0002-4886-4305 NR 54 TC 71 Z9 72 U1 4 U2 18 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0029-8549 J9 OECOLOGIA JI Oecologia PD AUG PY 1992 VL 91 IS 2 BP 163 EP 170 DI 10.1007/BF00317779 PG 8 WC Ecology SC Environmental Sciences & Ecology GA JJ700 UT WOS:A1992JJ70000003 PM 28313452 ER PT J AU WHITE, WE HUNTER, JR VANWOERKOM, L DITMIRE, T PERRY, MD AF WHITE, WE HUNTER, JR VANWOERKOM, L DITMIRE, T PERRY, MD TI 120-FS TERAWATT TI-AL2O3/CR-LISRALF6 LASER SYSTEM SO OPTICS LETTERS LA English DT Article ID CHIRPED-PULSE AMPLIFICATION; GENERATION AB We have developed a combined Ti:Al2O3/Cr:LiSrAlF6 laser system capable of producing terawatt pulses with a duration of 120 fs at a 1-Hz repetition rate. Chirped-pulse amplification in Ti:sapphire produces compressed 45-mJ pulses. Further amplification in flash-lamp-pumped Cr:LiSrAlF6 produces 150-mJ compressed pulses with no significant effect on beam quality or pulse shape. RP WHITE, WE (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-251,LIVERMORE,CA 94550, USA. NR 13 TC 50 Z9 50 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD AUG 1 PY 1992 VL 17 IS 15 BP 1067 EP 1069 DI 10.1364/OL.17.001067 PG 3 WC Optics SC Optics GA JE802 UT WOS:A1992JE80200011 PM 19794721 ER PT J AU HUNDLEY, MF MCHENRY, ME DUNLAP, RA SRINIVAS, V BAHADUR, D AF HUNDLEY, MF MCHENRY, ME DUNLAP, RA SRINIVAS, V BAHADUR, D TI MAGNETIC-MOMENT AND SPIN-GLASS BEHAVIOR IN AN AL65MN20GE15 QUASI-CRYSTAL SO PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES LA English DT Article ID AL-SI-MN; CRYSTALLINE PHASES; HEAT-CAPACITY; ALLOYS; TEMPERATURE; TRANSITION; SYMMETRY; DENSITY; STATES AB An icosahedral quasicrystal of composition Al65Mn20Ge15 has been produced by rapid solidification processing. X-ray diffraction reveals this to be a single-phase quasicrystal to the limits of resolution (less-than-or-equal-to 5%) of X-ray powder diffractometry. Magnetic susceptibility measurements disclose a large local moment on Mn in this material as determined from fits to a Curie-Weiss law. A 2.10-mu(B) local moment is the largest observed for Mn in Al-based quasicrystalline alloys with similar concentrations (Mn content). D.c. magnetization measurements show a nonlinear field dependence of the magnetization in the field range between 1 and 5 T. A spin glass transition has also been observed at low temperatures and studied using d.c. and ac. susceptibility measurements and field-dependent specific heat measurements. A spin glass freezing temperature, T(f) approximately 8 K, in a 1 T applied field, has been determined from thermomagnetic hysteresis as the temperature at which the field cooled (FC) and zero field cooled (ZFC) d.c. susceptibilities begin to differ. This spin glass transition has been further characterized using a.c. susceptibility measurements where a cusp in the real component, chi', of the a.c. susceptibility is observed. The cusp position is studied at frequencies of 33.3, 111.1 and 1000 Hz. Finally, specific heat measurements have been performed in fields up to 10 T and in the temperature range between 2 and 20 K. A departure from Debye-like behaviour is observed for T < 10 K and attributed to the spin glass transition. These measurements suggest that less than 1% of Mn atoms participate in the spin glass state in zero field. Larger fields are shown to suppress the number of Mn atoms participating in the spin glass state. C1 DALHOUSIE UNIV,DEPT PHYS,HALIFAX B3H 3J5,NS,CANADA. INDIAN INST TECHNOL,CTR MAT SCI,BOMBAY 400076,INDIA. CARNEGIE MELLON UNIV,DEPT MET ENGN & MAT SCI,PITTSBURGH,PA 15213. RP HUNDLEY, MF (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI McHenry, Michael/B-8936-2009 NR 30 TC 6 Z9 6 U1 0 U2 3 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8637 J9 PHILOS MAG B JI Philos. Mag. B-Phys. Condens. Matter Stat. Mech. Electron. Opt. Magn. Prop. PD AUG PY 1992 VL 66 IS 2 BP 239 EP 250 DI 10.1080/13642819208224587 PG 12 WC Materials Science, Multidisciplinary; Mechanics; Physics, Applied; Physics, Condensed Matter SC Materials Science; Mechanics; Physics GA JG014 UT WOS:A1992JG01400008 ER PT J AU PICOREL, R BAKHTIARI, M LU, T COTTON, TM SEIBERT, M AF PICOREL, R BAKHTIARI, M LU, T COTTON, TM SEIBERT, M TI SURFACE-ENHANCED RESONANCE RAMAN-SCATTERING SPECTROSCOPY AS A SURFACE-TOPOGRAPHY PROBE IN PLANT PHOTOSYNTHETIC MEMBRANES SO PHOTOCHEMISTRY AND PHOTOBIOLOGY LA English DT Article ID CHLOROPHYLL A/B-PROTEIN; PHOTOSYSTEM-II MEMBRANES; 3-DIMENSIONAL STRUCTURE; LUMENAL SURFACE; SPINACH; ORGANIZATION; CAROTENOIDS; PARTICLES; MANGANESE; COMPLEX AB Strong resonance Raman (RR) and surface-enhanced resonance Raman scattering (SERRS) signals from carotenoids were detected from thylakoid (stromal-side out) vesicles and inside-out (lumenal-side out) vesicles isolated from spinach chloroplasts. The intensity of the signals from both types of membranes was comparable, indicating that -!ant carotenoids are exposed on or close to both surfaces or sides of the thylakoid membrane. This is in contrast to previous studies with bacterial photosynthetic membranes (Picorel et al., 1988, J. Biol. Chem. 263, 4374-4380; and 1990, Biochemistry 29, 707-712) that show carotenoids selectively located on the cytoplasmic side. In addition, strong RR and SERRS signals were detected from stacked and unstacked photosystem-II-enriched membrane fragments, demonstrating that carotenoids are also exposed on both surfaces of the appressed region of the thylakoid membrane. Antibodies against the photosystem (PS) II extrinsic proteins blocked SERRS signals from stacked PS II membrane fragments, but only partially affected the SERRS signals from unstacked membranes. The results indicate that these antibodies, which preferentially cover the surface of the original lumenal-side of the appressed region, act as spacers between the membrane and SERRS electrode surfaces. The original stromal-side of the appressed region is unaffected. These findings verify the distance sensitivity of the SERRS technique and underscore the above conclusion about the location of carotenoids in the appressed regions. Finally, SERRS signals are sensitive to membrane aging and storage temperature; caution is suggested to those applying SERRS spectroscopy to intact membrane systems. C1 NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401. US DOE,AMES LAB,AMES,IA 50011. CSIC,ESTAC EXPTL AULA DEI,E-50080 ZARAGOZA,SPAIN. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RI PICOREL, RAFAEL/K-7930-2014 OI PICOREL, RAFAEL/0000-0003-3791-129X NR 38 TC 14 Z9 14 U1 0 U2 1 PU AMER SOC PHOTOBIOLOGY PI AUGUSTA PA BIOTECH PARK, 1021 15TH ST, SUITE 9, AUGUSTA, GA 30901-3158 SN 0031-8655 J9 PHOTOCHEM PHOTOBIOL JI Photochem. Photobiol. PD AUG PY 1992 VL 56 IS 2 BP 263 EP 270 DI 10.1111/j.1751-1097.1992.tb02156.x PG 8 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JC905 UT WOS:A1992JC90500017 ER PT J AU CARLOS, WE KAPLAN, R LOWNDES, DH NORTON, DP AF CARLOS, WE KAPLAN, R LOWNDES, DH NORTON, DP TI MICROWAVE PROPERTIES OF YBA2CU3O7-DELTA/PRBA2CU3O7-DELTA SUPERLATTICES SO PHYSICA C LA English DT Article ID HIGH-TC SUPERCONDUCTORS; SINGLE-CRYSTALS; THIN-FILMS AB We have used non-resonant microwave absorption to study c-axis YBa2Cu3O7-delta/PrBa2Cu3O7-delta superlattices and compare the response to a film of similarly grown YBa2Cu3O7-delta (YBCO). Near the respective transition temperatures, the response of the superlattice samples and the YBCO film have similar amplitudes and orientation dependences. This is consistent with the microwave loss being related to magnetic flux penetration at (110) slip planes. At lower temperatures, the response of the superlattices is much stronger than that of the YBCO film and, while both responses are hysteretic at low temperatures, the widths of the hysteresis have opposite orientation dependences, which we attribute to the role of the PrBa2Cu3O7-delta layers. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP CARLOS, WE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG 1 PY 1992 VL 198 IS 3-4 BP 247 EP 255 DI 10.1016/0921-4534(92)90198-L PG 9 WC Physics, Applied SC Physics GA JF994 UT WOS:A1992JF99400007 ER PT J AU UMEZAWA, A FENG, Y EDELMAN, HS HIGH, YE LARBALESTIER, D SUNG, YS HELLSTROM, EE FLESHLER, S AF UMEZAWA, A FENG, Y EDELMAN, HS HIGH, YE LARBALESTIER, D SUNG, YS HELLSTROM, EE FLESHLER, S TI ELECTROMAGNETIC GRANULARITY, CRITICAL CURRENT-DENSITY, AND LOW-TC PHASE FORMATION AT THE GRAIN-BOUNDARIES IN (BI,PB)2SR2CA2CU3OX SILVER-SHEATHED TAPES SO PHYSICA C LA English DT Article AB Transport critical currents are correlated with DC magnetization, AC susceptibility and high resolution electron microscopy in progressively heat treated Ag-clad (Bi,Pb)2Sr2Ca2Cu3Ox (2223) tapes. Both the zero field cooled magnetization shielding curves and the real component of the AC susceptibilities show two diamagnetic transitions. One transition is found to occur at 109 K and is the signature of the 2223 phase. A second, much larger transition occurs over a range of temperatures between 75 and 105 K. The transport critical current densities correlate directly with the lower magnetic transition temperature. High resolution electron microscopy reveals a few layers of Bi2Sr2CaCu2Ox (2212) phase clustered at the numerous (001) twist grain boundaries. These residual layers require a long reaction for their elimination and directly control the critical current while they are present. C1 UNIV WISCONSIN,DEPT MAT SCI & ENGN,MADISON,WI 53706. UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907. RP UMEZAWA, A (reprint author), UNIV WISCONSIN,CTR APPL SUPERCONDUCTIV,MADISON,WI 53706, USA. RI Larbalestier, David/B-2277-2008 OI Larbalestier, David/0000-0001-7098-7208 NR 18 TC 72 Z9 73 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG 1 PY 1992 VL 198 IS 3-4 BP 261 EP 272 DI 10.1016/0921-4534(92)90200-V PG 12 WC Physics, Applied SC Physics GA JF994 UT WOS:A1992JF99400009 ER PT J AU SALAZAR, KV OTT, KC DYE, RC HUBBARD, KM PETERSON, EJ COULTER, JY KODAS, TT AF SALAZAR, KV OTT, KC DYE, RC HUBBARD, KM PETERSON, EJ COULTER, JY KODAS, TT TI AEROSOL ASSISTED CHEMICAL VAPOR-DEPOSITION OF SUPERCONDUCTING YBA2CU3O7-X SO PHYSICA C LA English DT Article ID LARGE-AREA; MICROWAVE APPLICATIONS; THIN-FILMS AB A hybrid process, aerosol-assisted chemical vapor deposition (AACVD), is described for reproducible preparation of superconducting thin films of YBa2Cu3O7-x. The process consists of atomizing a toluene solution of the Y, Ba, and Cu tetramethylheptanedionato complexes using an aerosol generator. The aerosol is transported into a CVD reactor where solvent and precursor evaporation and deposition occur at atmospheric pressure on heated substrates. The process provides stable evaporation rates for all three precursors, yielding constant film stoichiometry throughout the deposition period and from film to film. Superconducting films may be deposited in-situ at substrate heater temperatures above 825-degrees-C, or may be formed at lower temperatures by deposition followed by post-deposition annealing at higher temperatures. The microstructure and quality of films are highly dependent on the conditions employed in deposition and in the case of films deposited below 825-degrees-C, the post-deposition annealing conditions. Superconducting films prepared by the AACVD/post-annealing process have a metallic normal state resistivity signature with a zero resistance temperature typically above 88K, and are highly c-axis oriented. Transport critical current densities measured at 75 K on polycrystalline films prepared by the AACVD process are 220 000 A/cm2 and 84 000 A/cm2 at self-field and 0.1 T, respectively. C1 UNIV NEW MEXICO,DEPT CHEM & NUCL ENGN,ALBUQUERQUE,NM 87131. UNIV NEW MEXICO,CTR MICROENGINEERED CERAM,ALBUQUERQUE,NM 87131. RP SALAZAR, KV (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 14 TC 24 Z9 24 U1 1 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 AUG 1 PY 1992 VL 198 IS 3-4 BP 303 EP 308 DI 10.1016/0921-4534(92)90205-Q PG 6 WC Physics, Applied SC Physics GA JF994 UT WOS:A1992JF99400014 ER PT J AU KIJIMA, N GRONSKY, R XIANG, XD VAREKA, WA HOU, J ZETTL, A CORKILL, JL COHEN, ML AF KIJIMA, N GRONSKY, R XIANG, XD VAREKA, WA HOU, J ZETTL, A CORKILL, JL COHEN, ML TI STRUCTURAL-PROPERTIES OF STAGE-1 IODINE-INTERCALATED SUPERCONDUCTING-I(BI0.915, PB0.085)2(SR0.93, PB0.07)2(CA0.965, PB0.035)2CU3OX SO PHYSICA C LA English DT Article ID CU-O SYSTEM; HIGH-TC PHASE; CRYSTAL-STRUCTURE; SEMPER SYSTEM; BI; MODULATION; SUPERCONDUCTOR; MODE AB The crystal structure of stage-1 iodine-intercalated superconducting I(Bi0.915, Pb0.085)2(Sr0.93, Pb0.07)2(Ca0.965, Pb0.035)2Cu3Ox has been determined by transmission electron microscopy to belong to the space group Pma2 with lattice parameters a = 5.4 angstrom, b = 5.4 angstrom, and c = 22.0 angstrom. lodine atoms intercalated as monolayers between every Bi-O bilayer alter the atomic stacking across Bi-O layers from the staggered configuration characteristic of superconducting (Bi0.915, Pb0.085)2(Sr0.93, Pb0.07)2(Ca0.965, Pb0.035)2Cu3Ox to a vertically aligned configuration in I (Bi0.915, Pb0.085)2(Sr0.93. Pb0.07)2 (Ca0.965, Pb0.035)2Cu3Ox. Iodine bilayers have also been observed to form between Bi-O layers, yielding a new series of stage-n iodine-intercalated compounds. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP KIJIMA, N (reprint author), MITSUBISHI KASEI CORP,RES CTR,1000 KAMOSHIDA CHO,MIDORI KU,YOKOHAMA 227,JAPAN. RI Hou, Jianguo/G-5076-2010; Xiang, Xiaodong/A-9445-2012; Zettl, Alex/O-4925-2016; Xiang, Xiaodong/A-5936-2017 OI Zettl, Alex/0000-0001-6330-136X; 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 0921-4534 J9 PHYSICA C JI Physica C PD AUG 1 PY 1992 VL 198 IS 3-4 BP 309 EP 317 DI 10.1016/0921-4534(92)90206-R PG 9 WC Physics, Applied SC Physics GA JF994 UT WOS:A1992JF99400015 ER PT J AU KRESIN, VZ WOLF, SA AF KRESIN, VZ WOLF, SA TI INDUCED SUPERCONDUCTIVITY AND GAPLESS STATE IN YBA2CU3O7-X SO PHYSICA C LA English DT Article ID ENERGY-GAP; PARAMETERS; CRYSTAL AB The removal of oxygen from YBa2Cu3O7-x has a profound impact on various properties of this compound. The model of induced two gap superconductivity that we developed previously allows us to describe these properties. For example, for compositions between 0 1 transitions are determined to be 9.4+/-1.5 cm-1 for (2P3/2)3P3/2 --> (2P3/2)3s at 9.9365 nm and 6.4(-1.5)+2.0 CM-1 for (2P1/2)3P3/2 --> (2P1/2)3s at 10.0377 nm. These are the highest gain coefficients yet observed to our knowledge for any short-wavelength laser. Gain is observed on three other Ne-like lines including a J = 0 --> 1 transition at 8.1563 nm, the shortest wavelength yet observed to our knowledge for a Ne-like x-ray laser. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 20 TC 55 Z9 56 U1 1 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9926 EI 2469-9934 J9 PHYS REV A JI Phys. Rev. A PD AUG 1 PY 1992 VL 46 IS 3 BP 1606 EP 1609 DI 10.1103/PhysRevA.46.1606 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JH411 UT WOS:A1992JH41100056 ER PT J AU MORIBAYASHI, K HINO, K MATSUZAWA, M KIMURA, M AF MORIBAYASHI, K HINO, K MATSUZAWA, M KIMURA, M TI HYPERSPHERICAL APPROACH TO DOUBLE-ELECTRON EXCITATION OF HE BY FAST-ION IMPACT .3. EXCITATION TO THE (2L, 2L') MANIFOLD BY MULTIPLY-CHARGED-ION IMPACT SO PHYSICAL REVIEW A LA English DT Note ID DOUBLE IONIZATION; EXCITED-STATES; HELIUM; PROTONS; ATOMS; ANTIPROTONS; COLLISIONS AB Double-electron-excitation processes of He atoms by multiply-charged-ion impact have been theoretically investigated using the close-coupling method in the MeV/u energy regime. Hyperspherical wave functions are adopted to take full account of the strongly correlated motion of two atomic electrons in He. The Born series is used to analyze the results of cross sections obtained by the close-coupling method. The cross section of the process to the 2p2p 1D(e) state is found to show the most rapid increase as the projectile charge Z(p) increases, while that to the 2s2p 1P(o) state indicates the slowest in the double-electron-excitation processes to the (2l, 2l') manifold. For high Z(p) at 1.5 MeV/u, the 2p2p 1D(e) cross section becomes dominant in the excitation processes to the (2l,2l') manifold. Physical interpretation based on the rovibrator model is given concerning the correlated motion of two atomic electrons. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RICE UNIV,DEPT PHYS,HOUSTON,TX 77251. RP MORIBAYASHI, K (reprint author), UNIV ELECTROCOMMUN,DEPT APPL PHYS & CHEM,1-5-1 CHOFU GA OKA,CHOFU,TOKYO 182,JAPAN. NR 16 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 AUG 1 PY 1992 VL 46 IS 3 BP 1684 EP 1687 DI 10.1103/PhysRevA.46.1684 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JH411 UT WOS:A1992JH41100068 ER PT J AU BOTERO, J SHERTZER, J AF BOTERO, J SHERTZER, J TI DIRECT NUMERICAL-SOLUTION OF THE SCHRODINGER-EQUATION FOR QUANTUM SCATTERING PROBLEMS SO PHYSICAL REVIEW A LA English DT Note ID DOUBLY EXCITED-STATES; INTERMEDIATE ENERGIES; ELASTIC-SCATTERING; ATOMIC-HYDROGEN; H SCATTERING; ELECTRONS; RESONANCE AB A direct numerical solution of the Schrodinger equation for quantum scattering problems is presented. The wave function for each partial wave is expanded in coupled spherical harmonics and the corresponding radial functions are expanded in a local basis set using finite-element analysis, with the appropriate scattering boundary conditions. The method is shown to give very accurate results for elastic phase shifts (S, P, D, and F) and resonance positions for electron-hydrogen scattering. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. COLL HOLY CROSS,DEPT PHYS,WORCESTER,MA 01610. RP BOTERO, J (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. NR 22 TC 35 Z9 35 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 AUG 1 PY 1992 VL 46 IS 3 BP R1155 EP R1158 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JH411 UT WOS:A1992JH41100001 ER PT J AU BASKES, MI AF BASKES, MI TI MODIFIED EMBEDDED-ATOM POTENTIALS FOR CUBIC MATERIALS AND IMPURITIES SO PHYSICAL REVIEW B LA English DT Article ID SURFACE-ENERGY ANISOTROPIES; X-RAY-DIFFRACTION; TRANSITION-METALS; FCC METALS; SELF-DIFFUSION; SILICON; MODEL; DEFECTS; DIAMOND; SOLIDS AB In a comprehensive study, the modified embedded-atom method is extended to a variety of cubic materials and impurities. In this extension, all functions are analytic and computationally simple. The basic equations of the method are developed and applied to 26 elements: ten fcc, ten bcc, three diamond cubic, and three gaseous materials. The materials modeled include metals, semiconductors, and diatomic gases, all of which exhibit different types of bonding. Properties of these materials, including equation of state, elastic moduli, structural energies and lattice constants, simple defects, and surfaces, are calculated. The formalism for applying the method to combinations of these elements is developed and applied to the calculation of dilute heats of solution. In all cases, comparison is made to experiment or higher-level calculations when possible. RP BASKES, MI (reprint author), SANDIA NATL LABS,MAT & PROC RES DEPT,LIVERMORE,CA 94551, USA. NR 62 TC 1065 Z9 1109 U1 21 U2 168 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 AUG 1 PY 1992 VL 46 IS 5 BP 2727 EP 2742 DI 10.1103/PhysRevB.46.2727 PG 16 WC Physics, Condensed Matter SC Physics GA JG573 UT WOS:A1992JG57300009 ER PT J AU SMITH, MG GOODENOUGH, JB MANTHIRAM, A TAYLOR, RD OESTERREICHER, H AF SMITH, MG GOODENOUGH, JB MANTHIRAM, A TAYLOR, RD OESTERREICHER, H TI EFFECT OF ANNEALING ON THE LOCAL MICROSTRUCTURE AND TC IN Y1-ZCAZBA2(CU0.90CO0.10)3O6+Y SO PHYSICAL REVIEW B LA English DT Article ID FE-SITE OCCUPANCY; EMISSION MOSSBAUER; SUPERCONDUCTING PROPERTIES; THERMAL TREATMENTS; OXYGEN; YBA2CU3O7-DELTA; SUBSTITUTION; COPPER; ORDER; CU AB An investigation of the Co distribution in Y1-zCazBa2(Cu0.90Co0.10)3O6+y, z=0.00 and 0.05, for different annealing treatments has been made with Co-57 emission Mossbauer spectroscopy. Samples prepared by conventional ceramic techniques were first annealed in oxygen at 650-degrees-C for 15 h, 800-degrees-C for 1 h, and 400-degrees-C for 3 h (treatment [O]); they were next annealed at 700-degrees-C in N2 (treatment [N]); they were finally annealed at 350-degrees-C in O2 (treatment [NO]). After [O], the Co atoms for z=0.00 were distributed nearly 50-50 on Cu(1) and Cu(2) sites with evidence for Co-atom clustering in the Cu(1)O(y) planes; for z=0.05, over 80% of the Co were on the Cu(1) sites, and, more important, Co-atom clustering was evident. During treatment [N], Co atoms migrated form Cu(2) sites to the cobalt clusters in the Cu(1)O(y) planes. After [NO], the Co-atom clusters remained, with some increase in size in the z=0.00 sample, and the superconductive onset temperature T0 increased from its value after [O], but its superconductive transition width DELTA-T(c) also increased. A Fe-57(4+) daughter is observed for Co3+ in a fivefold-coordinated Cu(1) site. These observations are discussed in comparison with results of similar experiments by others. C1 LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545. UNIV CALIF SAN DIEGO,DEPT CHEM B017,LA JOLLA,CA 92093. RP SMITH, MG (reprint author), UNIV TEXAS,CTR ENGN TEACHING 9104,CTR MAT SCI & ENGN,AUSTIN,TX 78712, USA. OI Goodenough, John Bannister/0000-0001-9350-3034 NR 42 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 AUG 1 PY 1992 VL 46 IS 5 BP 3041 EP 3049 DI 10.1103/PhysRevB.46.3041 PG 9 WC Physics, Condensed Matter SC Physics GA JG573 UT WOS:A1992JG57300047 ER PT J AU OSSANDON, JG THOMPSON, JR CHRISTEN, DK SALES, BC SUN, YG LAY, KW AF OSSANDON, JG THOMPSON, JR CHRISTEN, DK SALES, BC SUN, YG LAY, KW TI FLUX-CREEP STUDIES OF VORTEX PINNING IN AN ALIGNED YBA2CU3O7-DELTA SUPERCONDUCTOR WITH OXYGEN DEFICIENCIES DELTA-LESS-THAN-OR-EQUAL-TO-0.2 SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; DEPENDENCE; RELAXATION; CURRENTS; DENSITY AB Flux-creep measurements were carried out in magnetically aligned, sintered samples of YBa2Cu3O7-delta with various oxygen deficiencies-delta (in the range 0 less-than-or-equal-to delta less-than-or-equal-to 0.2), for temperatures T in the range from 5 to 75 K, with an applied magnetic field H parallel-to c axis of 1 T. The normalized flux-creep rate S = d lnM/d Int was determined as a function of T and delta. The effective vortex-pinning potential U(eff)(J) and the pinning energy U0 were calculated both in the linear Anderson-Kim approximation as well as in the nonlinear formalism of vortex-glass and collective-pinning theory. The applicability of the nonlinear formalism was tested and discussed. There is a close correspondence between the energy scaling parameter U0 of the nonlinear model and the pinning energy of a pointlike pinning center. A comparison of the experimental results with predictions of collective-pinning theory reveals a consistent picture of vortex motion in this family of superconductors. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. GE,CTR CORP RES & DEV,SCHENECTADY,NY 12301. RP OSSANDON, JG (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. RI Christen, David/A-9709-2008 NR 23 TC 65 Z9 65 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 AUG 1 PY 1992 VL 46 IS 5 BP 3050 EP 3058 DI 10.1103/PhysRevB.46.3050 PG 9 WC Physics, Condensed Matter SC Physics GA JG573 UT WOS:A1992JG57300048 ER PT J AU RUNDE, M ROUTBORT, JL MUNDY, JN ROTHMAN, SJ WILEY, CL XU, X AF RUNDE, M ROUTBORT, JL MUNDY, JN ROTHMAN, SJ WILEY, CL XU, X TI DIFFUSION OF O-18 IN BI2SR2CUOX SINGLE-CRYSTALS SO PHYSICAL REVIEW B LA English DT Note AB Tracer diffusion of O-18 in the ab plane and in the c direction in single crystals of Bi2Sr2CuOx, has been investigated at one atmosphere oxygen pressure in the temperature ranges 250-350 and 450-700-degrees-C, respectively The diffusion coefficients determined from penetration profiles measured with secondary-ion mass spectrometry are D(ab) = 8X10(-5) exp(-1.01 eV/kT) cm2/s and D(c) = 0.06 exp(-2.11 eV/kT) cm2/s. Comparison of the results for Bi2Sr2CuOx with those recently published for Bi2Sr2CaCu2Oy indicates that the differences in structure between these two superconductors do not have a strong effect on the oxygen tracer-diffusion rates. C1 NORWEGIAN ELECT POWER RES INST,N-7034 TRONDHEIM,NORWAY. RP RUNDE, M (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 5 TC 23 Z9 23 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 1 PY 1992 VL 46 IS 5 BP 3142 EP 3144 DI 10.1103/PhysRevB.46.3142 PG 3 WC Physics, Condensed Matter SC Physics GA JG573 UT WOS:A1992JG57300068 ER PT J AU AMATO, A CANFIELD, PC FEYERHERM, R FISK, Z GYGAX, FN HEFFNER, RH MACLAUGHLIN, DE OTT, HR SCHENCK, A THOMPSON, JD AF AMATO, A CANFIELD, PC FEYERHERM, R FISK, Z GYGAX, FN HEFFNER, RH MACLAUGHLIN, DE OTT, HR SCHENCK, A THOMPSON, JD TI LOW-TEMPERATURE MAGNETISM IN YBBIPT SO PHYSICAL REVIEW B LA English DT Note ID SPIN RELAXATION AB Positive-muon (mu+) spin-relaxation experiments have been carried out in a pressed-powder sample of the low-carrier-density heavy-electron system YbBiPt. Spatially inhomogeneous and disordered static Yb magnetism is observed below approximately 0.5 K, with a strongly reduced Yb moment of approximately 0.1-mu(B) over approximately 50% of the sample volume at T=0.06 K. Substantial mu+ spin-lattice relaxation, rarely observed in heavy-electron systems, suggests anomalously slow Yb spin fluctuations. Our data are reminiscent of mu+ behavior in spin glasses, and raise the question of whether the large low-temperature specific heat in YbBiPt is due in part to low-lying magnetic excitations. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. LEIDEN UNIV,KAMERLINGH ONNES LAB,2300 RA LEIDEN,NETHERLANDS. SWISS FED INST TECHNOL,FESTKORPERPHYS LAB,CH-8093 ZURICH,SWITZERLAND. UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521. RP AMATO, A (reprint author), ETH ZURICH,INST MITTELENERGIEPHYS,CH-5232 VILLIGEN,SWITZERLAND. 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 14 TC 18 Z9 18 U1 2 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 1 PY 1992 VL 46 IS 5 BP 3151 EP 3154 DI 10.1103/PhysRevB.46.3151 PG 4 WC Physics, Condensed Matter SC Physics GA JG573 UT WOS:A1992JG57300071 ER PT J AU CHO, JH BORSA, F JOHNSTON, DC TORGESON, DR AF CHO, JH BORSA, F JOHNSTON, DC TORGESON, DR TI SPIN DYNAMICS IN LA2-XSRXCUO4 (0.02-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.08) FROM LA-139 NQR RELAXATION - FLUCTUATIONS IN A FINITE-LENGTH-SCALE SYSTEM SO PHYSICAL REVIEW B LA English DT Note ID LA2CUO4; ANTIFERROMAGNET; TEMPERATURES; BEHAVIOR AB La-139 NQR spin-lattice relaxation rates (NSLR) versus temperature are presented for La2-xSrxCuO4 with x=0.02-0.08. The NSLR below approximately 2T(N)(x) shows a power-law critical behavior while above approximately 2T(N)(x) it follows an exponential law with a small x-dependent spin-stiffness constant, where T(N)(x) is the magnetic ordering temperature. It is argued that the NSLR arises from fluctuations of the staggered magnetization in locally ordered mesoscopic domains. We infer that the magnetically ordered state is not a conventional spin glass, as is often assumed. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. UNIV PAVIA,DIPARTIMENTO FIS A VOLTA,I-27100 PAVIA,ITALY. RP CHO, JH (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 23 TC 108 Z9 108 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 AUG 1 PY 1992 VL 46 IS 5 BP 3179 EP 3182 DI 10.1103/PhysRevB.46.3179 PG 4 WC Physics, Condensed Matter SC Physics GA JG573 UT WOS:A1992JG57300078 ER PT J AU LI, Q SUENAGA, M GOHNG, JH FINNEMORE, DK HIKATA, T SATO, K AF LI, Q SUENAGA, M GOHNG, JH FINNEMORE, DK HIKATA, T SATO, K TI REVERSIBLE MAGNETIC-PROPERTIES OF C-AXIS-ORIENTED SUPERCONDUCTING BI2SR2CA2CU3O10 SO PHYSICAL REVIEW B LA English DT Note ID SINGLE-CRYSTAL BI2SR2CACU2O8; PENETRATION DEPTH; CRITICAL-FIELD; ANISOTROPY; DEPENDENCE; YBA2CU3O7; WIRES AB Magnetization measurements on c-axis-oriented bulk superconducting Bi2Sr2Ca2Cu3O10 have been carried out with the magnetic field applied parallel to the c axis. Fitting the results to the variation model for magnetization suggested by Hao and Clem shows that the Ginzburg-Landau parameter-kappa is nearly constant for 74 less-than-or-equal-to T less-than-or-equal-to 86 K, with the value of 170 at 74 K, and slowly increases with temperature from approximately 86 to approximately 100 K. Kappa-diverges in the vicinity of T(c). This unusual temperature dependence of kappa(T) could come from extended fluctuation effects and a limitation of the Hao-Chem theory, which may fail to describe this extremely anisotropic Bi-based superconductor. By fitting the data with the value of kappa-equal to 170, the deduced values of some of the superconducting parameters are H(c)(0) = 10600 Oe, xi(0)ab = 10.5 +/- 0.6 angstrom, lambda(0)ab = 1940 +/- 13 angstrom, dH(c)2/dT congruent-to -3.68 T/K near T(c). C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. SUMITOMO ELECT IND LTD,OSAKA RES LABS,KONOHANA KU,OSAKA 554,JAPAN. RP LI, Q (reprint author), BROOKHAVEN NATL LAB,DIV MAT SCI,UPTON,NY 11973, USA. NR 23 TC 68 Z9 68 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 AUG 1 PY 1992 VL 46 IS 5 BP 3195 EP 3198 DI 10.1103/PhysRevB.46.3195 PG 4 WC Physics, Condensed Matter SC Physics GA JG573 UT WOS:A1992JG57300082 ER PT J AU POLLOCK, EL RUNGE, KJ AF POLLOCK, EL RUNGE, KJ TI FINITE-SIZE-SCALING ANALYSIS OF A SIMULATION OF THE HE-4 SUPERFLUID TRANSITION SO PHYSICAL REVIEW B LA English DT Article ID XY-MODEL; FILMS AB Several finite-size scaling techniques are applied to path-integral simulations of the superfluid transition in three-dimensional (3D) He-4 at low pressure. The twist free energy shows a linear increase with periodic cell length below the transition temperature, which it predicts as 2.19+/-0.02 K. (The experimental value is 2.172 K.) Fitting the superfluid fraction to the scaled form L-rho(s)(t,L)/rho = Q(L(1/v)t), t =(T - T(c))/T(c), gives T(c) = 2.17+/-0.05 K and the correlation-length exponent v=0.72+/-0.1 (experimentally 0.67). The universal constant (HBAR2-rho/mkT(c))Q(0)=0.50+/-0.02 found here compares well with the value 0.49+/-0.01 from recent 3D XY model simulations. Additional analyses that include corrections to scaling are found to yield values for T(c) in agreement with the above estimates. A phenomenological renormalization analysis suggests the superfluid density exponent u=(1.0-1.3)v, consistent with the Josephson relation. RP POLLOCK, EL (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550, USA. NR 15 TC 38 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 AUG 1 PY 1992 VL 46 IS 6 BP 3535 EP 3539 DI 10.1103/PhysRevB.46.3535 PG 5 WC Physics, Condensed Matter SC Physics GA JJ319 UT WOS:A1992JJ31900036 ER PT J AU DAEMEN, LL CAMPBELL, LJ KOGAN, VG AF DAEMEN, LL CAMPBELL, LJ KOGAN, VG TI FLUX-LINE LATTICE IN UNIAXIAL SUPERCONDUCTORS AT LOW MAGNETIC INDUCTIONS SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; NEUTRON-DIFFRACTION; ANISOTROPIC SUPERCONDUCTORS; FIELD INVERSION; VORTEX CHAINS; VORTICES AB Within the London approximation, we predict the geometry of the flux lattice in anisotropic, strongly type-II superconductors for arbitrary field orientation and intensity. At low magnetic fields, the scaling of the lattice parameters with field differs markedly from the ordinary B-1/2 dependence. We also calculate the form factors and reflectivities for neutron diffraction. The dependence of the reflectivity on the angle between the magnetic field and the c axis, and on the field intensity, is calculated. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP DAEMEN, LL (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. RI Lujan Center, LANL/G-4896-2012 NR 28 TC 28 Z9 28 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 AUG 1 PY 1992 VL 46 IS 6 BP 3631 EP 3637 DI 10.1103/PhysRevB.46.3631 PG 7 WC Physics, Condensed Matter SC Physics GA JJ319 UT WOS:A1992JJ31900045 ER PT J AU VIGDOR, SE JACOBS, WW KNUTSON, LD SOWINSKI, J BLOCH, C JOLIVETTE, PL WISSINK, SW BYRD, RC WHIDDON, C AF VIGDOR, SE JACOBS, WW KNUTSON, LD SOWINSKI, J BLOCH, C JOLIVETTE, PL WISSINK, SW BYRD, RC WHIDDON, C TI CHARGE SYMMETRY-BREAKING IN (N)RIGHT-ARROW-(P)RIGHT-ARROW SCATTERING AT 183 MEV SO PHYSICAL REVIEW C LA English DT Article ID NUCLEON-NUCLEON-SCATTERING; PROTON ELASTIC-SCATTERING; INTERMEDIATE ENERGIES; FORCES; POLARIZATION; PARAMETERS; DEPENDENCE; VIOLATION; MESONS; ANN AB We report the results of a precise test of charge symmetry in the scattering of polarized neutrons from polarized protons at a laboratory bombarding energy of 183 MeV. The observable sensitive to charge symmetry is the difference between the analyzing powers associated with the neutron spin [A(n)(theta)] and with the proton spin [A(p)(theta)]. Systematic errors and experimental ambiguities in the measurement of this difference are extensively discussed. Our result for DELTA-A = A(n) - A(p), averaged over the angular range 82.2-degrees less-than-or-equal-to theta(c.m.) less-than-or-equal-to 116.1-degrees, is (33.1+/-5.9+/-4.3) x 10(-4). With the statistical and systematic errors added in quadrature, this value is 3.4 standard deviations larger than the effect expected from pure photon exchange (the electromagnetic spin-orbit interaction) between the neutron and proton, and thus represents clear evidence of charge symmetry breaking in the strong interaction. We also extract information about the angular dependence of DELTA-A(theta), within limitations imposed by uncertainties in the measured beam and target polarizations. Both the angle-averaged value and the angular dependence measured for DELTA-A are in excellent agreement with predictions from meson-exchange theory, when these include both the effect of the n-p mass difference on one-pion exchange and the isospin mixing of rho-0 and omega-0 mesons. In particular, the Bonn nucleon-nucleon (NN) potential model accounts for the present results utilizing rho-NN and omega-NN coupling constant values deduced previously for this potential from fits to more conventional NN scattering data. C1 INDIANA UNIV, DEPT PHYS, BLOOMINGTON, IN 47405 USA. LAB NATL SATURNE, F-91191 GIF SUR YVETTE, FRANCE. UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA. HOPE COLL, DEPT PHYS, HOLLAND, MI 49423 USA. LOS ALAMOS NATL LAB, DIV P2, LOS ALAMOS, NM 87545 USA. RP VIGDOR, SE (reprint author), INDIANA UNIV, CYCLOTRON FACIL, BLOOMINGTON, IN 47405 USA. NR 50 TC 66 Z9 66 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 EI 1089-490X J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1992 VL 46 IS 2 BP 410 EP 448 DI 10.1103/PhysRevC.46.410 PG 39 WC Physics, Nuclear SC Physics GA JH969 UT WOS:A1992JH96900004 ER PT J AU KUHNERT, A ALBER, D GRAWE, H KLUGE, H MAIER, KH REVIOL, W SUN, X BECK, EM BYRNE, AP HUBEL, H BACELAR, JC DELEPLANQUE, MA DIAMOND, RM STEPHENS, FS AF KUHNERT, A ALBER, D GRAWE, H KLUGE, H MAIER, KH REVIOL, W SUN, X BECK, EM BYRNE, AP HUBEL, H BACELAR, JC DELEPLANQUE, MA DIAMOND, RM STEPHENS, FS TI OBSERVATION OF HIGH-SPIN STATES IN THE N = 84 NUCLEUS ER-152 AND COMPARISON WITH SHELL-MODEL CALCULATIONS SO PHYSICAL REVIEW C LA English DT Article ID NEUTRON-TRANSFER REACTIONS; IN-BEAM EXPERIMENTS; OCTUPOLE STATES; YRAST STATES; MASS VALUES; GD-148; EXCITATIONS; IMPACT AB High-spin states in 152Er have been populated through the Sn-116(Ar-40,4n)152Er reaction. Prompt and delayed gamma-gamma-gamma-t and gamma-e-t coincidences have been measured. Levels and transitions are assigned up to an excitation energy of 15 MeV and spin and parities up to 28+ at 9.7 MeV. A new isomer [t1/2 = 11(1) ns] has been observed at 13.4 MeV. The results are discussed in comparison with neighboring nuclei and with shell-model calculations. C1 HAHN MEITNER INST KERNFORSCH BERLIN GMBH,W-1000 BERLIN,GERMANY. UNIV BONN,INST STRAHLEN & KERNPHYS,W-5200 BONN,GERMANY. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. INST MODERN PHYS,LANZHOO,PEOPLES R CHINA. AV HUMBOLDT STIFTUNG,W-5300 BONN,GERMANY. AUSTRALIAN NATL UNIV,DEPT NUCL PHYS,CANBERRA,ACT 2601,AUSTRALIA. OI Byrne, Aidan/0000-0002-7096-6455 NR 28 TC 11 Z9 11 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1992 VL 46 IS 2 BP 484 EP 498 DI 10.1103/PhysRevC.46.484 PG 15 WC Physics, Nuclear SC Physics GA JH969 UT WOS:A1992JH96900009 ER PT J AU HOREN, DJ MORRIS, CL SEESTROM, SJ HERSMAN, FW CALARCO, JR HOLTROP, M LEUSCHNER, M RAWOOLSULLIVAN, M GARNETT, RW GREENE, SJ PLUM, MA ZUMBRO, JD AF HOREN, DJ MORRIS, CL SEESTROM, SJ HERSMAN, FW CALARCO, JR HOLTROP, M LEUSCHNER, M RAWOOLSULLIVAN, M GARNETT, RW GREENE, SJ PLUM, MA ZUMBRO, JD TI ISOSPIN CHARACTER OF THE TRANSITION TO THE 0.803-MEV STATE IN PB-206 FROM PI+/- SCATTERING AT 180 MEV SO PHYSICAL REVIEW C LA English DT Article ID GIANT QUADRUPOLE-RESONANCE; COUPLED-CHANNELS CALCULATIONS; OPEN-SHELL NUCLEI; INELASTIC-SCATTERING; MATRIX-ELEMENTS; DEFORMATION PARAMETERS; CORE POLARIZATION; SCHEMATIC MODEL; NEUTRON; SN-118 AB Elastic and inelastic pi-+/- scattering by Pb-206 has been studied to measure the isospin character of transitions to bound states. The data have been interpreted using both distorted wave impulse approximation and optical model potentials. The data for the collective states at 2.647 MeV (3-) and 4.111 MeV (2+) are well reproduced with delta(l)+=delta(l)-=delta(l)p, i.e., assuming that these transitions are isoscalar. For the 0.803-MeV, 2+ level we deduce M(n)/M(p)=2.6+/-0.3 which is in excellent agreement with a value obtained from inelastic heavy-ion scattering. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV NEW HAMPSHIRE,DURHAM,NH 03824. NEW MEXICO STATE UNIV,LAS CRUCES,NM 88003. UNIV PENN,PHILADELPHIA,PA 19104. RP HOREN, DJ (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 26 TC 4 Z9 4 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1992 VL 46 IS 2 BP 499 EP 503 DI 10.1103/PhysRevC.46.499 PG 5 WC Physics, Nuclear SC Physics GA JH969 UT WOS:A1992JH96900010 ER PT J AU LEE, IY BAKTASH, C BEENE, JR HALBERT, ML HENSLEY, DC JOHNSON, NR MCGOWAN, FK RILEY, MA SARANTITES, DG AF LEE, IY BAKTASH, C BEENE, JR HALBERT, ML HENSLEY, DC JOHNSON, NR MCGOWAN, FK RILEY, MA SARANTITES, DG TI QUANTITATIVE STUDIES OF CONTINUUM GAMMA-RAY CORRELATIONS IN HF-170 SO PHYSICAL REVIEW C LA English DT Article ID HIGH-SPIN STATES; ROTATIONAL MOTION; NUCLEI AB We have studied the two-dimensional energy correlation of the continuum gamma-rays in 170Hf produced in a heavy-ion fusion reaction. The gamma-rays were measured with an array of Compton-suppressed Ge detectors and the Spin Spectrometer. A quantitative analysis has been carried out on the properties of the peaks and dips in the correlation spectra. The results indicate the existence of at least two widths in the gamma-ray energy distribution: a narrow width of about 20 keV, most likely originating from decay along different discrete bands near the yrast line, and a wide width of about 200 keV from mixed states at higher excitation energy. Theoretical calculations including the effect of level mixing and fluctuations in rotational frequency and moment of inertia give results in general agreement with the experiment. C1 JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. WASHINGTON UNIV,ST LOUIS,MO 63130. RP LEE, IY (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 24 TC 3 Z9 3 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1992 VL 46 IS 2 BP 597 EP 603 DI 10.1103/PhysRevC.46.597 PG 7 WC Physics, Nuclear SC Physics GA JH969 UT WOS:A1992JH96900022 ER PT J AU YOKOYAMA, A LOVELAND, W LILJENZIN, JO ALEKLETT, K MORRISSEY, DJ SEABORG, GT AF YOKOYAMA, A LOVELAND, W LILJENZIN, JO ALEKLETT, K MORRISSEY, DJ SEABORG, GT TI FRAGMENTATION OF AU-197 BY 21 MEV/NUCLEON XE-129 SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION REACTIONS; DISTRIBUTIONS; SYSTEMATICS; MOMENTUM AB We have measured the nuclidic production cross sections and recoil properties for intermediate mass fragments, fission fragments, and heavy residues from the interaction of 21 MeV/nucleon Xe-129 with Au-197. From these measurements, we have deduced the fragment mass distributions and fragment velocities, momenta, etc. The fragment N/Z ratios, isomeric state populations, and mean fragment energies are similar to those observed in low energy, deep inelastic scattering. The stochastic nucleon exchange model correctly predicts the shape of the heavy residue mass distribution, but overestimates (by a factor of 2-3) the fragment longitudinal velocities as does the dissipative fragmentation model, perhaps due to the lack of preequilibrium emission in these models. C1 CHALMERS UNIV TECHNOL,S-41296 GOTHENBURG,SWEDEN. STUDSVIK NEUTRON RES LAB,S-61182 NYKOPING,SWEDEN. MICHIGAN STATE UNIV,DEPT CHEM,E LANSING,MI 48824. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. OSAKA UNIV,DEPT CHEM,TOYONAKA,OSAKA 500,JAPAN. RP YOKOYAMA, A (reprint author), OREGON STATE UNIV,DEPT CHEM,CORVALLIS,OR 97331, USA. NR 24 TC 10 Z9 10 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1992 VL 46 IS 2 BP 647 EP 654 DI 10.1103/PhysRevC.46.647 PG 8 WC Physics, Nuclear SC Physics GA JH969 UT WOS:A1992JH96900028 ER PT J AU KRAUSS, RA ALSTER, J ASHERY, D BART, S CHRIEN, RE HIEBERT, JC JOHNSON, RR KISHIMOTO, T MARDOR, I MARDOR, Y MOINESTER, MA OLSHEVSKY, R PIASETZKY, E PILE, PH SAWAFTA, R STEARNS, RL SUTTER, RJ WEISS, R YAVIN, AI AF KRAUSS, RA ALSTER, J ASHERY, D BART, S CHRIEN, RE HIEBERT, JC JOHNSON, RR KISHIMOTO, T MARDOR, I MARDOR, Y MOINESTER, MA OLSHEVSKY, R PIASETZKY, E PILE, PH SAWAFTA, R STEARNS, RL SUTTER, RJ WEISS, R YAVIN, AI TI K+ TOTAL CROSS-SECTIONS ON C-12 AND MEDIUM EFFECTS IN NUCLEI SO PHYSICAL REVIEW C LA English DT Article ID SCATTERING; MEV/C AB The total cross sections for K+ mesons on carbon and deuterium nuclei have been measured at eleven momenta in the range 450-740 MeV/c. The experimental technique was of the standard transmission type. The K+ meson is the least strongly interacting of available hadronic probes, with a long mean free path in nuclear matter. At low incident momentum the K+ N interaction is dominated by the S11 phase shift and varies slowly with energy. These characteristics make the K+ an ideal tool for probing the nuclear volume to reveal nuclear medium effects. Measurements of the ratio of the total cross sections, per nucleon, of K+-C-12 to K+-d have been suggested as a way to reveal effects of the nuclear medium. The total cross section ratios are found to lie significantly above those predicted by the usual nuclear medium corrections. This suggests that novel phenomena axe taking place within the nucleus. Several models which incorporate such phenomena are discussed, including nucleon "swelling," mass rescaling, nuclear pions, and relativistic effects. C1 BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. OSAKA UNIV, TOYONAKA, OSAKA 560, JAPAN. TEL AVIV UNIV, RAYMOND & BEVERLY SACKLER FAC EXACT SCI, SCH PHYS, IL-69978 TEL AVIV, ISRAEL. TRIUMF, VANCOUVER, BC, CANADA. VASSAR COLL, POUGHKEEPSIE, NY 12601 USA. RP TEXAS A&M UNIV SYST, COLL STN, TX 77843 USA. NR 31 TC 60 Z9 61 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9985 EI 2469-9993 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1992 VL 46 IS 2 BP 655 EP 666 DI 10.1103/PhysRevC.46.655 PG 12 WC Physics, Nuclear SC Physics GA JH969 UT WOS:A1992JH96900029 ER PT J AU ANDERSEN, E BARNES, PD BLAES, R BRAUN, H BROM, JM CASTANO, B CHERNEY, M COHLER, M DELACRUZ, B DIEBOLD, GE FERNANDEZ, C FRANKLIN, G GARABATOS, C GARZON, JA GEIST, WM GREINER, D GRUHN, C HAFIDOUNI, M HRUBEC, J HUSS, D JACQUOT, JL JONES, PG KUIPERS, JPM LADREM, M DEGUEVARA, PL LIKO, D LOPEZPONTE, S LOVHOIDEN, G MACNAUGHTON, J MAHER, CJ MICHALON, A MICHALONMENTZER, ME MOSQUERA, J NATKANIEC, Z NELSON, JM NEUHOFER, G DELOSHEROS, CP PLO, M PORTH, P POWELL, B QUINN, B RAMIL, A RIESTER, JL ROHRINGER, H SAKREJDA, G SAKREJDA, I THORSTEINSEN, T TRAXLER, J VOLTOLINI, C YANEZ, A YEPES, P ZYBERT, R AF ANDERSEN, E BARNES, PD BLAES, R BRAUN, H BROM, JM CASTANO, B CHERNEY, M COHLER, M DELACRUZ, B DIEBOLD, GE FERNANDEZ, C FRANKLIN, G GARABATOS, C GARZON, JA GEIST, WM GREINER, D GRUHN, C HAFIDOUNI, M HRUBEC, J HUSS, D JACQUOT, JL JONES, PG KUIPERS, JPM LADREM, M DEGUEVARA, PL LIKO, D LOPEZPONTE, S LOVHOIDEN, G MACNAUGHTON, J MAHER, CJ MICHALON, A MICHALONMENTZER, ME MOSQUERA, J NATKANIEC, Z NELSON, JM NEUHOFER, G DELOSHEROS, CP PLO, M PORTH, P POWELL, B QUINN, B RAMIL, A RIESTER, JL ROHRINGER, H SAKREJDA, G SAKREJDA, I THORSTEINSEN, T TRAXLER, J VOLTOLINI, C YANEZ, A YEPES, P ZYBERT, R TI TARGET DEPENDENCE OF CENTRAL RAPIDITY KAPPA PRODUCTION IN SULFUR-NUCLEUS COLLISIONS AT 200 GEV/C PER NUCLEON SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION COLLISIONS; CHAMBER; ENERGY AB Central rapidity LAMBDA-production has been measured in sulfur collisions with Cu, Ag, and Pb at 200 GeV/c per nucleon. Lambdas produced in these collisions were identified by their charged decays recorded by a time projection chamber. The LAMBDA-yields are compared as a function of target mass. For each target, the yields are reported as a function of LAMBDA-transverse kinetic energy and zero degree energy (a measure of collision centrality). In each system, the data exceed predictions of the VENUS (4.02) model of sulfur-nucleus collisions. The observed excesses show no obvious variation with collision centrality from moderate to highly central collisions. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV BIRMINGHAM,DEPT PHYS,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. CERN,CH-1211 GENEVA 23,SWITZERLAND. CIEMAT,DIV FIS PARTICULAS,E-28040 MADRID,SPAIN. INST FIZ JADROWEJ,PL-30055 KRAKOW 30,POLAND. CREIGHTON UNIV,DEPT PHYS,OMAHA,NE 68178. CARNEGIE MELLON UNIV,DEPT PHYS,PITTSBURGH,PA 15213. UNIV SANTIAGO,DEPT FIS PARTICULAS,E-15706 SANTIAGO,SPAIN. UNIV LOUIS PASTEUR,INST NATL PHYS NUCL & PHYS PARTICULES,CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. UNIV YORK,DEPT PHYS,YORK YO1 5DD,N YORKSHIRE,ENGLAND. RP ANDERSEN, E (reprint author), UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. RI de la Cruz, Begona/K-7552-2014; Plo Casasus, Maximo/M-1445-2014; Franklin, Gregg/N-7743-2014; Ramil, Alberto/B-4698-2008; Quinn, Brian/N-7343-2014 OI Plo Casasus, Maximo/0000-0002-2289-918X; Franklin, Gregg/0000-0003-4176-1378; Ramil, Alberto/0000-0002-5333-9425; Quinn, Brian/0000-0003-2800-986X NR 16 TC 4 Z9 4 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1992 VL 46 IS 2 BP 727 EP 735 DI 10.1103/PhysRevC.46.727 PG 9 WC Physics, Nuclear SC Physics GA JH969 UT WOS:A1992JH96900037 ER PT J AU ZHANG, JY HE, XC SHIH, CC SORENSEN, SP WONG, CY AF ZHANG, JY HE, XC SHIH, CC SORENSEN, SP WONG, CY TI TRANSVERSE ENERGY AND FORWARD ENERGY-PRODUCTION IN A HIGH-ENERGY NUCLEAR COLLISION MODEL SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION COLLISIONS; HADRON-NUCLEUS; PROTON-NUCLEUS; VENUS AB Distributions of transverse energy, forward energy, and dE(T)/d-eta from 60A GeV and 200A GeV O-16-induced and 200A GeV S-32-induced nuclear collision with Al, Cu, Ag, and Au are calculated by a high energy nuclear collision model and compared to recent experimental data from the WA80 Collaboration at CERN. The high energy nuclear collision Monte Carlo model, which is based on the concept of independent multiple nucleon-nucleon collisions, describes the experimental data at forward-rapidity and midrapidity well. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP ZHANG, JY (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. OI Wong, Cheuk-Yin/0000-0001-8223-0659 NR 13 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1992 VL 46 IS 2 BP 748 EP 753 DI 10.1103/PhysRevC.46.748 PG 6 WC Physics, Nuclear SC Physics GA JH969 UT WOS:A1992JH96900039 ER PT J AU ZHU, X BOWMAN, JD BOWMAN, CD BUSH, JE DELHEIJ, PPJ FRANKLE, CM GOULD, CR HAASE, DG KNUDSON, JN MITCHELL, GE PENTTILA, S POSTMA, H ROBERSON, NR SEESTROM, SJ SZYMANSKI, JJ YUAN, VW AF ZHU, X BOWMAN, JD BOWMAN, CD BUSH, JE DELHEIJ, PPJ FRANKLE, CM GOULD, CR HAASE, DG KNUDSON, JN MITCHELL, GE PENTTILA, S POSTMA, H ROBERSON, NR SEESTROM, SJ SZYMANSKI, JJ YUAN, VW TI PARITY NONCONSERVATION FOR NEUTRON RESONANCES IN U-238 SO PHYSICAL REVIEW C LA English DT Article ID NON-CONSERVATION; SPIN ROTATION; LA-139; VIOLATION; OPTICS; TIN AB Parity nonconservation (PNC) was studied for 16 p-wave resonances in U-238 by measuring the helicity dependence of the total cross section for epithermal neutrons scattered from U-238. A statistical analysis yields a root-mean-square PNC matrix element M=0.56(-0.20)+0.41 meV, which corresponds to a spreading width of GAMMA(PV)=0.9 x 10(-7) eV. Under plausible assumptions this gives a value of 4 x 10(-7) for \alpha(p)\, the ratio of strengths of the P-odd and P-even effective nucleon-nucleon interactions. C1 DUKE UNIV,DURHAM,NC 27706. TRIANGLE UNIV NUCL LAB,DURHAM,NC 27706. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. N CAROLINA STATE UNIV,RALEIGH,NC 27695. TRIUMF,VANCOUVER V6T 2A3,BC,CANADA. DELFT UNIV TECHNOL,2600 GA DELFT,NETHERLANDS. RI Gould, Christopher/M-7676-2013; OI Bush, Judith/0000-0001-6240-4121 NR 44 TC 49 Z9 49 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1992 VL 46 IS 2 BP 768 EP 777 DI 10.1103/PhysRevC.46.768 PG 10 WC Physics, Nuclear SC Physics GA JH969 UT WOS:A1992JH96900042 ER PT J AU FRANKLE, CM BOWMAN, JD BUSH, JE DELHEIJ, PPJ GOULD, CR HAASE, DG KNUDSON, JN MITCHELL, GE PENTTILA, S POSTMA, H ROBERSON, NR SEESTROM, SJ SZYMANSKI, JJ YOO, SH YUAN, VW ZHU, X AF FRANKLE, CM BOWMAN, JD BUSH, JE DELHEIJ, PPJ GOULD, CR HAASE, DG KNUDSON, JN MITCHELL, GE PENTTILA, S POSTMA, H ROBERSON, NR SEESTROM, SJ SZYMANSKI, JJ YOO, SH YUAN, VW ZHU, X TI PARITY NONCONSERVATION FOR NEUTRON RESONANCES IN TH-232 SO PHYSICAL REVIEW C LA English DT Article ID LA-139 AB Parity nonconserving (PNC) longitudinal analyzing powers were measured for 23 p-wave neutron resonances in Th-232. Seven resonances show effects of greater than 2.4-sigma statistical significance-the largest sample yet measured in a single nucleus. All seven analyzing powers have positive sign. Strong sign correlations are not a feature of the conventional statistical model of parity mixing between compound nuclear states. The asymmetry was expressed as a sum of two terms: a constant asymmetry and a fluctuating asymmetry. With this ansatz the root-mean-square PNC matrix element M = 1.2(-0.4)+0.5 meV, which corresponds to a spreading width of GAMMA(PV) = 6 x 10(-7) eV. C1 N CAROLINA STATE UNIV,RALEIGH,NC 27695. TRIANGLE UNIV NUCL LAB,DURHAM,NC 27706. TRIUMF,VANCOUVER V6T 2A3,BC,CANADA. DELFT UNIV TECHNOL,2600 GA DELFT,NETHERLANDS. DUKE UNIV,DURHAM,NC 27706. RP FRANKLE, CM (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Gould, Christopher/M-7676-2013; OI Bush, Judith/0000-0001-6240-4121 NR 35 TC 65 Z9 65 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1992 VL 46 IS 2 BP 778 EP 787 DI 10.1103/PhysRevC.46.778 PG 10 WC Physics, Nuclear SC Physics GA JH969 UT WOS:A1992JH96900043 ER PT J AU ZAMFIR, NV CASTEN, RF VONBRENTANO, P CHOU, WT AF ZAMFIR, NV CASTEN, RF VONBRENTANO, P CHOU, WT TI F-SPIN MULTIPLETS OF O(6)-LIKE NUCLEI SO PHYSICAL REVIEW C LA English DT Note ID SYMMETRY; STATES; REGION; PT-196; PROTON; SCHEME AB Exploiting the concept of F spin to link extended series of noncontiguous nuclei, it is proposed that F-spin multiplets (F = 4.5, 5, and 5.5, respectively) commencing with Yb-158, Yb-160, Yb-162 comprise series of nuclei with similar character resembling the O(6) dynamical symmetry or, at least, the gamma-soft O(5) subgroup. The evidence brought to bear on this stems from the yrast ground band levels, B (E2) values, and signature effects in medium-spin negative-parity levels. C1 INST ATOM PHYS,BUCHAREST,ROMANIA. BROOKHAVEN NATL LAB,UPTON,NY 11973. CLARK UNIV,WORCESTER,MA 01610. RP ZAMFIR, NV (reprint author), UNIV COLOGNE,INST KERNPHYS,W-5000 COLOGNE 41,GERMANY. RI Zamfir, Nicolae Victor/F-2544-2011 NR 24 TC 4 Z9 4 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1992 VL 46 IS 2 BP R393 EP R396 DI 10.1103/PhysRevC.46.R393 PG 4 WC Physics, Nuclear SC Physics GA JH969 UT WOS:A1992JH96900002 ER PT J AU AHLEN, S AMBROSIO, M ANTOLINI, R AURIEMMA, G BALDINI, A BAM, BB BARBARINO, GC BARISH, BC BATTISTONI, G BELLOTTI, R BEMPORAD, C BERNARDINI, P BILOKON, H BISI, V BLOISE, C BUSSINO, S CAFAGNA, F CALICCHIO, M CAMPANA, P CAMPANA, D CARBONI, M CECCHINI, S CEI, F CHIARELLA, V CHIERA, C COBIS, A CORMACK, R CORONA, A COUTU, S DECATALDO, G DEMARZO, C DEVINCENZI, M DICREDICO, A DIEHL, E ERRIQUEZ, O FAVUZZI, C FICENEC, D FORTI, C FOTI, L FUSCO, P GIACOMELLI, G GIANNINI, G GIGLIETTO, N GIUBELLINO, P GRASSI, M GREEN, P GRILLO, A GUARINO, F GUSTAVINO, C HABIG, A HEINZ, R HONG, JT IAROCCI, E KATSAVOUNIDIS, E KEARNS, E KLEIN, S KYRIAZOPOULOU, S LAMANNA, E LANE, C LEE, C LEVIN, D LIPARI, P LIU, G LIU, R LONGO, MJ LUDLAM, G MANCARELLA, G MANDRIOLI, G MARGIOTTANERI, A MARIN, A MARINI, A MARTELLO, D MARTELLOTTI, G CHIESA, AM MASERA, M MATTEUZZI, P MICHAEL, DG MILLER, L MONACELLI, P MONTENO, M MUFSON, S MUSSER, J NUTTER, S OKADA, C OSTERIA, G PALAMARA, O PARLATI, S PATERA, V PATRIZII, L PAZZI, R PECK, CW PETRAKIS, J PETRERA, S PIGNATANO, ND PISTILLI, P PREDIERI, F RAMELLO, L REYNOLDSON, J RONGA, F ROSA, G SATRIANO, C SATTA, L SCAPPARONE, E SCHOLBERG, K SCIUBBA, A LUGARESI, PS SEVERI, M SITTA, M SPINELLI, P SPINETTI, M SPURIO, M STEELE, J STEINBERG, R STONE, JL SULAK, LR SURDO, A TARLE, G TOGO, V VALENTE, V VERDONE, GR WALTER, CW WEBB, R WORSTELL, W AF AHLEN, S AMBROSIO, M ANTOLINI, R AURIEMMA, G BALDINI, A BAM, BB BARBARINO, GC BARISH, BC BATTISTONI, G BELLOTTI, R BEMPORAD, C BERNARDINI, P BILOKON, H BISI, V BLOISE, C BUSSINO, S CAFAGNA, F CALICCHIO, M CAMPANA, P CAMPANA, D CARBONI, M CECCHINI, S CEI, F CHIARELLA, V CHIERA, C COBIS, A CORMACK, R CORONA, A COUTU, S DECATALDO, G DEMARZO, C DEVINCENZI, M DICREDICO, A DIEHL, E ERRIQUEZ, O FAVUZZI, C FICENEC, D FORTI, C FOTI, L FUSCO, P GIACOMELLI, G GIANNINI, G GIGLIETTO, N GIUBELLINO, P GRASSI, M GREEN, P GRILLO, A GUARINO, F GUSTAVINO, C HABIG, A HEINZ, R HONG, JT IAROCCI, E KATSAVOUNIDIS, E KEARNS, E KLEIN, S KYRIAZOPOULOU, S LAMANNA, E LANE, C LEE, C LEVIN, D LIPARI, P LIU, G LIU, R LONGO, MJ LUDLAM, G MANCARELLA, G MANDRIOLI, G MARGIOTTANERI, A MARIN, A MARINI, A MARTELLO, D MARTELLOTTI, G CHIESA, AM MASERA, M MATTEUZZI, P MICHAEL, DG MILLER, L MONACELLI, P MONTENO, M MUFSON, S MUSSER, J NUTTER, S OKADA, C OSTERIA, G PALAMARA, O PARLATI, S PATERA, V PATRIZII, L PAZZI, R PECK, CW PETRAKIS, J PETRERA, S PIGNATANO, ND PISTILLI, P PREDIERI, F RAMELLO, L REYNOLDSON, J RONGA, F ROSA, G SATRIANO, C SATTA, L SCAPPARONE, E SCHOLBERG, K SCIUBBA, A LUGARESI, PS SEVERI, M SITTA, M SPINELLI, P SPINETTI, M SPURIO, M STEELE, J STEINBERG, R STONE, JL SULAK, LR SURDO, A TARLE, G TOGO, V VALENTE, V VERDONE, GR WALTER, CW WEBB, R WORSTELL, W TI STUDY OF THE ULTRAHIGH-ENERGY PRIMARY-COSMIC-RAY COMPOSITION WITH THE MACRO EXPERIMENT SO PHYSICAL REVIEW D LA English DT Article ID NUCLEUS COLLISIONS; MUON BUNDLES; SPECTRUM; CASCADES; DETECTOR; ORIGIN AB We present the analysis of multiple-muon events collected with one supermodule (1013 h live time) and two supermodules (1195 h live time) of the MACRO detector at Gran Sasso, Italy. Multimuon rates are shown to be sensitive to primary-cosmic-ray energies between approximately 50 TeV and several thousand TeV. Experimental data are compared with the expected rates from two composition models: a light (i.e., proton-rich) and a heavy (i.e., Fe-rich) composition. The predictions are based on a Monte Carlo simulation of the hadronic interactions of cosmic-ray nuclei, followed by a detailed tracking of the muons through the rock and the experimental apparatus. The results show good sensitivity of the MACRO detector to primary composition. The data exhibit a preference towards the light composition model. C1 UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. CALTECH,PASADENA,CA 91125. DREXEL UNIV,DEPT PHYS,PHILADELPHIA,PA 19104. UNIV LAQUILA,DIPARTIMENTO FIS,I-67100 LAQUILA,ITALY. UNIV LECCE,DIPARTIMENTO FIS,I-73100 LECCE,ITALY. NAPLES UNIV,DIPARTIMENTO FIS,I-80125 NAPLES,ITALY. UNIV ROME,DIPARTIMENTO FIS,I-00185 ROME,ITALY. TEXAS A&M UNIV SYST,DEPT PHYS,COLLEGE STN,TX 77843. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. UNIV PISA,DIPARTIMENTO FIS,I-56010 PISA,ITALY. IST NAZL FIS NUCL,LAB NAZL GRAN SASSO,I-67010 LAQUILA,ITALY. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 ROME,ITALY. UNIV BASILICATA,I-85100 POTENZA,ITALY. IST NAZL FIS NUCL,TRIESTE,ITALY. UNIV ROME,DIPARTIMENTO ENERGET,I-00185 ROME,ITALY. CNR,IST TESRE,I-40126 BOLOGNA,ITALY. WASHINGTON UNIV,DEPT PHYS,ST LOUIS,MO 63130. UNIV TRIESTE,I-34100 TRIESTE,ITALY. BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215. IST NAZL FIS NUCL,I-70126 BARI,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47405. INDIANA UNIV,DEPT ASTRON,BLOOMINGTON,IN 47405. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. IST NAZL FIS NUCL,LAB NAZL GRAN SASSO,I-67010 ASSERGI,ITALY. UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109. IST NAZL FIS NUCL,DIPARTIMENTO FIS,I-67100 LAQUILA,ITALY. IST NAZL FIS NUCL,I-73100 LECCE,ITALY. IST NAZL FIS NUCL,I-80125 NAPLES,ITALY. IST NAZL FIS NUCL,I-56010 PISA,ITALY. IST NAZL FIS NUCL,I-00185 ROME,ITALY. UNIV TURIN,DIPARTIMENTO FIS,I-10125 TURIN,ITALY. UNIV DELAWARE,BARTOL RES INST,NEWARK,DE 19716. IST NUCL FIS NUCL,I-10125 TURIN,ITALY. RP AHLEN, S (reprint author), UNIV BARI,DIPARTIMENTO FIS,I-70126 BARI,ITALY. RI gustavino, carlo/K-4355-2015; Spurio, Maurizio/G-4170-2012; giglietto, nicola/I-8951-2012; Masera, Massimo/J-4313-2012; Cafagna, Francesco/A-9299-2010; Ramello, Luciano/F-9357-2013; Lamanna, Ernesto/C-7658-2012; Barbarino, Giancarlo/L-2559-2015; Martello, Daniele/J-3131-2012; Cei, Fabrizio/M-8891-2016; Guarino, Fausto/I-3166-2012; OI Masera, Massimo/0000-0003-1880-5467; Coutu, Stephane/0000-0003-2923-2246; Sciubba, Adalberto/0000-0002-3301-9176; Monteno, Marco/0000-0002-3521-6333; ERRIQUEZ, Onofrio/0000-0002-9784-6568; Bellotti, Roberto/0000-0003-3198-2708; gustavino, carlo/0000-0003-3232-7027; Carboni, Massimo/0000-0003-4296-3799; Petrera, Sergio/0000-0002-6029-1255; giglietto, nicola/0000-0002-9021-2888; Cafagna, Francesco/0000-0002-7450-4784; Lamanna, Ernesto/0000-0002-7844-8230; Barbarino, Giancarlo/0000-0001-9253-3397; Martello, Daniele/0000-0003-2046-3910; Cei, Fabrizio/0000-0002-8313-3540; Guarino, Fausto/0000-0003-1427-9885; Cormack, Robert/0000-0001-5553-9984 NR 35 TC 39 Z9 39 U1 0 U2 11 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 AUG 1 PY 1992 VL 46 IS 3 BP 895 EP 902 DI 10.1103/PhysRevD.46.895 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JE627 UT WOS:A1992JE62700005 ER PT J AU RIZZO, TG AF RIZZO, TG TI INDIRECT DILEPTON SIGNATURES IN TEV E+E- AND E-E- COLLISIONS SO PHYSICAL REVIEW D LA English DT Article ID SU(15) GRAND UNIFICATION; LEPTOQUARK PRODUCTION; COLLIDERS AB We examine the indirect signatures for the existence of spin-1 dileptons, which are predicted in SU(15) grand unified theory, in both e+e- and e-e- collisions at TeV energies. For reasonable values of the coupling strengths, such particles can be searched for far beyond the center-of-mass energies of such colliders. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP RIZZO, TG (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 23 TC 16 Z9 16 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG 1 PY 1992 VL 46 IS 3 BP 910 EP 913 DI 10.1103/PhysRevD.46.910 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JE627 UT WOS:A1992JE62700007 ER PT J AU DELDUCA, V BRODSKY, SJ HOYER, P AF DELDUCA, V BRODSKY, SJ HOYER, P TI SPACE-TIME STRUCTURE OF DEEP-INELASTIC LEPTON-HADRON SCATTERING SO PHYSICAL REVIEW D LA English DT Article ID QUANTUM ELECTRODYNAMICS; INFINITE-MOMENTUM AB We discuss the space-time structure of deep-inelastic scattering in the target rest frame. At small Bjorken x, the process is dominated by quark pair production, and the "Ioffe time" between the production of the pair and its interaction in the target is long. We compute the leading logarithmic corrections to the parton model predictions for the virtual photoabsorption cross section, and analyze the transverse size of the pair and the Ioffe time as a function of the dynamical variables of the pair constituents. Both the transverse size and the Ioffe time depend significantly on the polarization (longitudinal or transverse) of the virtual photon. Hence one may expect that nuclear scattering corrections, including shadowing, may also be polarization dependent. C1 UNIV HELSINKI,DEPT PHYS,SF-00100 HELSINKI 10,FINLAND. RP DELDUCA, V (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 19 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 AUG 1 PY 1992 VL 46 IS 3 BP 931 EP 943 DI 10.1103/PhysRevD.46.931 PG 13 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JE627 UT WOS:A1992JE62700010 ER PT J AU HUGHES, J MATHEWS, GJ AF HUGHES, J MATHEWS, GJ TI SKYRMION RECOIL IN PION-NUCLEON SCATTERING SO PHYSICAL REVIEW D LA English DT Article ID CURRENT-ALGEBRA; N-SCATTERING; HEAVY MESONS; MODEL; SOLITON; PHOTOPRODUCTION; LAGRANGIANS; BARYONS AB We calculate the lowest-order recoil corrections to the pion-nucleon scattering matrix in the SU(2) Skyrme model. The corrections result from a direct semiclassical evaluation of path-integral expressions for relevant finite-time transition amplitudes. The S matrix for pion-nucleon scattering is extracted from these amplitudes by using a configuration-space representation for the asymptotic nucleons; the quanta are treated just as in the vacuum sector. The recoil corrections result from the Skyrmion freely translating between initial and final positions, and are relevant to a kinematical regime opposite to that where the impulse approximation is valid. The form of the corrections is model independent, unchanged for any chiral model with hedgehog solitary wave solutions. Remarkably, new lowest-lying resonances emerge in the p channels, whereas the s and d waves are not noticeably improved. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP HUGHES, J (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 47 TC 1 Z9 1 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG 1 PY 1992 VL 46 IS 3 BP 970 EP 989 DI 10.1103/PhysRevD.46.970 PG 20 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JE627 UT WOS:A1992JE62700014 ER PT J AU GATOFF, G WONG, CY AF GATOFF, G WONG, CY TI ORIGIN OF THE SOFT P(T) SPECTRA SO PHYSICAL REVIEW D LA English DT Article ID FLUX-TUBE MODEL; NUCLEUS-NUCLEUS COLLISIONS; PAIR PRODUCTION; PARTICLE-PRODUCTION; FINITE-SIZE; CONSTANT FIELDS; EXTERNAL-FIELD; CREATION; QUARK; FRAGMENTATION AB In high-energy collisions, the soft p(T) spectra for produced mesons contain information on the motion of the quarks and antiquarks which form these mesons. We extract this information in the context of the flux-tube model with Schwinger's mechanism for particle production. We solve the Dirac equation for quarks (and antiquarks) inside a flux tube, described as an infinitely long cylinder of radius r0, with a uniform electric field-kappa inside it. We calculate the production rate of quarks, antiquarks, and pions as a function of p(T). We study first a sharp transverse boundary, and find that the result deviates from the experimental soft p(T) spectra, with its characteristic exponential fall. We therefore introduce a scalar potential which varies smoothly in the radial direction. With simplifying assumptions we show how the experimental p(T) spectra of pions, created in p-p collisions, determine the transverse wave function and the scalar potential that would produce it. The classical turning point for this potential is of the order of 0.6 fm. However, the potential flattens out considerably beyond that point. The wave function decays as r-3/2 and there appears to be a considerable excursion of the quark into regions far beyond the classical turning point. C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. RP GATOFF, G (reprint author), OAK RIDGE NATL LAB,CTR COMPUTAT INTENS PHYS,OAK RIDGE,TN 37831, USA. OI Wong, Cheuk-Yin/0000-0001-8223-0659 NR 29 TC 22 Z9 24 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG 1 PY 1992 VL 46 IS 3 BP 997 EP 1006 DI 10.1103/PhysRevD.46.997 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JE627 UT WOS:A1992JE62700016 ER PT J AU NEUBERT, M AF NEUBERT, M TI SYMMETRY-BREAKING CORRECTIONS TO MESON DECAY CONSTANTS IN THE HEAVY-QUARK EFFECTIVE THEORY SO PHYSICAL REVIEW D LA English DT Article ID EFFECTIVE FIELD-THEORY; FORM-FACTORS; RESONANCE PHYSICS; QCD; LIGHT; HADRONS; STAR AB Spin- and flavor-symmetry-breaking corrections to decay constants of heavy mesons are analyzed in next-to-leading order in the 1/m(Q) expansion. The general structure of these corrections is derived in an effective-field-theory approach. The subleading universal form factors, which parametrize the matrix elements of higher-dimensional operators in the effective theory, axe estimated using QCD sum rules. The renormalization-group improvement of these low-energy parameters is discussed in detail. As an application, the spin-symmetry-violating effects responsible for the vector-pseudoscalar mass difference and for the ratio of the corresponding decay constants, f(V)/f(P), are calculated. RP NEUBERT, M (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 63 TC 172 Z9 172 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG 1 PY 1992 VL 46 IS 3 BP 1076 EP 1087 DI 10.1103/PhysRevD.46.1076 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JE627 UT WOS:A1992JE62700024 ER PT J AU CHEN, PS AF CHEN, PS TI DIFFERENTIAL LUMINOSITY UNDER MULTIPHOTON BEAMSTRAHLUNG SO PHYSICAL REVIEW D LA English DT Article ID PHOTON-PHOTON COLLIDER; QUANTUM BEAMSTRAHLUNG; LINEAR COLLIDERS; PAIR PRODUCTION; PROSPECTS AB For the next generation of e+e- linear colliders in the TeV range, the energy loss due to beam-strahlung during the collision of the e+e- beams is expected to be substantial. One consequence is that the center-of-mass energy between the colliding particles can be largely degraded from the designed value. The knowledge on the differential luminosity as a function of the center-of-mass energy is essential for particle physics analysis on the interesting events. On the other hand, the beamstrahlung photon spectrum provides useful information on the low-energy backgrounds and high-energy-gamma-gamma-luminosity. In this paper, we derive analytic formulas for the e+e- and gamma-energy spectra under multiple beam-strahlung process, and the e+e- and gamma-gamma-differential luminosities. Major characteristics of these formulas are discussed. RP CHEN, PS (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 17 TC 43 Z9 43 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG 1 PY 1992 VL 46 IS 3 BP 1186 EP 1191 DI 10.1103/PhysRevD.46.1186 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JE627 UT WOS:A1992JE62700035 ER PT J AU LITTENBERG, LS SHROCK, RE AF LITTENBERG, LS SHROCK, RE TI UPPER-BOUNDS ON VERTICAL-BAR-DELTA-L-VERTICAL-BAR=2 DECAYS OF BARYONS SO PHYSICAL REVIEW D LA English DT Note AB From a retroactive data analysis, we derive the first upper bound on a \DELTA-L\ = 2 hyperon decay: B(XI- --> p-mu- mu-) < 3.7 X 10(-4_ (90% C.L.). We also comment on the decay SIGMA- --> p-mu- mu- and \DELTA-L\ = 2 decays of charmed and b baryons, in particular, XI(c)+ --> XI- mu- mu-. Finally, rough upper limits are given on B(SIGMA- --> p-mu- e-) and B(XI- --> p-mu- e-). C1 SUNY STONY BROOK,INST THEORET PHYS,STONY BROOK,NY 11794. RP LITTENBERG, LS (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. OI Littenberg, Laurence/0000-0001-8373-7179 NR 14 TC 9 Z9 9 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG 1 PY 1992 VL 46 IS 3 BP R892 EP R894 DI 10.1103/PhysRevD.46.R892 PG 3 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JE627 UT WOS:A1992JE62700004 ER PT J AU CLOUTMAN, LD WEHNER, MF AF CLOUTMAN, LD WEHNER, MF TI NUMERICAL-SIMULATION OF RICHTMYER-MESHKOV INSTABILITIES SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Article ID RAYLEIGH-TAYLOR INSTABILITY; SHOCK-WAVES; INTERFACES AB The results of detailed numerical simulations of the Richtmyer-Meshkov instability of the interface between layers of air and either helium or SF6 in a shock tube are reported. Two- and three-dimensional simulations based on both the Euler and Navier-Stokes equations were obtained by a finite difference method that employs a front-tracking technique to keep the interface sharp. The nature of the flow patterns induced by the instability is discussed. The results of a numerical resolution study and a demonstration of the influence of boundary layers are presented also. Agreement with experimental data is found to be satisfactory, with the exception of the initial instability growth rate. RP CLOUTMAN, LD (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 29 TC 51 Z9 54 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8213 J9 PHYS FLUIDS A-FLUID PD AUG PY 1992 VL 4 IS 8 BP 1821 EP 1830 DI 10.1063/1.858403 PG 10 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA JE923 UT WOS:A1992JE92300026 ER PT J AU BIGLARI, H ZONCA, F CHEN, L AF BIGLARI, H ZONCA, F CHEN, L TI ON RESONANT DESTABILIZATION OF TOROIDAL ALFVEN EIGENMODES BY CIRCULATING AND TRAPPED ENERGETIC IONS ALPHA-PARTICLES IN TOKAMAKS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Letter ID ALPHA-PARTICLES; EXCITATION; MODES AB Toroidal Alfven eigenmodes are shown to be resonantly destabilized by both circulating and trapped energetic ions/alpha particles. In particular, the energetic circulating ions are shown to resonate with the mode not only at the Alfven speed (upsilon(A)), but also at one-third of this speed, while for trapped ions, the dominant instability mechanism is shown to be due to the resonance between the precessional magnetic drift and the wave. Implications of the theory for present and future tokamaks are discussed. RP BIGLARI, H (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI chen, liu/I-2297-2013; Zonca, Fulvio/I-8236-2016 OI Zonca, Fulvio/0000-0002-9270-4704 NR 12 TC 38 Z9 38 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD AUG PY 1992 VL 4 IS 8 BP 2385 EP 2388 DI 10.1063/1.860208 PG 4 WC Physics, Fluids & Plasmas SC Physics GA JG026 UT WOS:A1992JG02600001 ER PT J AU BRETZ, N AF BRETZ, N TI ONE-DIMENSIONAL MODELING OF THE WAVELENGTH SENSITIVITY, LOCALIZATION, AND CORRELATION IN REFLECTOMETRY MEASUREMENTS OF PLASMA FLUCTUATIONS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID MICROWAVE REFLECTOMETRY; DENSITY-FLUCTUATIONS; ELECTROMAGNETIC-WAVES; ANOMALOUS TRANSPORT; TOKAMAKS; PROPAGATION; SCATTERING; FIELD AB The reflection of electromagnetic waves from a plasma cutoff layer has been used to examine properties of density fluctuations in fusion plasmas. In this paper an exact one-dimensional model is used to show the relation between changes in the phase of the reflected wave and the location, magnitude, and correlation properties of density fluctuations. For long-wavelength density perturbations the reflected phase can be simply related to the amplitude of fluctuating density and the density scale length, L(n), near the cutoff layer. However, the phase response falls substantially as the fluctuation wavelength approaches the free space wavelength of the reflected wave, lambda-0, and the location of the maximum response moves out in front of the cutoff layer following the wave matching condition k(LAMBDA) = 2k almost-equal-to 2-eta(x)k0. Thus, a measurement of the reflected phase is strongly weighted to and localized for phenomena whose wavelength is longer than the characteristic scale (lambda-0(2)L(n))1/3 . Because of this weighting and because the region of maximum response moves away from the cutoff layer for short-wavelength fluctuations, there is also a limitation in any estimate of the density correlation length from the reflected phase. The correlation of phases between several different probe frequencies can be used to estimate a density correlation length no less than about four times the free space probe wavelength. RP BRETZ, N (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 32 TC 75 Z9 75 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD AUG PY 1992 VL 4 IS 8 BP 2414 EP 2422 DI 10.1063/1.860210 PG 9 WC Physics, Fluids & Plasmas SC Physics GA JG026 UT WOS:A1992JG02600004 ER PT J AU PEYSER, TA MANKA, CK RIPIN, BH GANGULI, G AF PEYSER, TA MANKA, CK RIPIN, BH GANGULI, G TI ELECTRON-ION HYBRID INSTABILITY IN LASER-PRODUCED PLASMA EXPANSIONS ACROSS MAGNETIC-FIELDS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID EXTRAGALACTIC RADIO-SOURCES; LARGE-LARMOR-RADIUS; PROPAGATION; TRANSVERSE; SIMULATION; MAGNETOPLASMA; DYNAMICS; STREAMS; BEAMS AB High-intensity laser irradiation of hollow glass cylinders immersed in a magnetic field results in plasma expansions strongly collimated in the direction transverse to both the initial flow and the magnetic field, but jetlike in the direction parallel to the initial flow. Magnetic fields from B = 0 kG to B = 10 kG produced plasmas with markedly different geometrical features. Fast framing camera photographs show the plasmas propagating across magnetic field lines and undergoing structuring indicative of transverse velocity shear-driven instabilities. Comparison is made between the observed instability characteristics and predictions of Rayleigh-Taylor, classical Kelvin-Helmholtz, and the electron-ion hybrid instabilities. Only the electron-ion hybrid instability is consistent with the experimental results. C1 USN,RES LAB,DIV PLASMA PHYS,PLASMA PHYS BRANCH,WASHINGTON,DC 20375. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP PEYSER, TA (reprint author), SCI APPLIC INT CORP,MCLEAN,VA 22102, USA. NR 45 TC 35 Z9 35 U1 1 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD AUG PY 1992 VL 4 IS 8 BP 2448 EP 2458 DI 10.1063/1.860213 PG 11 WC Physics, Fluids & Plasmas SC Physics GA JG026 UT WOS:A1992JG02600008 ER PT J AU SHAING, KC HAZELTINE, RD AF SHAING, KC HAZELTINE, RD TI EFFECTS OF ORBIT SQUEEZING ON ION-TRANSPORT IN THE BANANA REGIME IN TOKAMAKS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID EDGE ELECTRIC-FIELD; L-H TRANSITION; POLOIDAL ROTATION; GEOMETRY; PLASMAS AB It is shown that ion transport in the banana regime in tokamaks is reduced in the presence of a strong shear in the radial electric field E(r), as is often observed in the edge region. For simplicity, the ordering with rho(pi)\d 1n E(r)/dr\ much greater than 1 but c\E(r)\/B(p)upsilon(ti) < 1 is adopted. Here, rho(pi) is the ion poloidal gyroradius, B(p) is the poloidal magnetic field strength, upsilon(ti) is the ion thermal speed, and c is the speed of light. A kinetic transport theory similar to those for bumpy tori and stellarators is developed to show that the ion thermal conductivity chi-i is reduced by a factor of roughly S-3/2, where S = 1 - (rho(pi)d 1n E(r)/dr)(cE(r)/B(p)upsilon(ti)). The result reflects more than simple orbit squeezing: The fraction of trapped ions is also modified by S. C1 UNIV TEXAS,INST FUSION STUDIES,AUSTIN,TX 78712. RP SHAING, KC (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 20 TC 66 Z9 66 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD AUG PY 1992 VL 4 IS 8 BP 2547 EP 2551 DI 10.1063/1.860170 PG 5 WC Physics, Fluids & Plasmas SC Physics GA JG026 UT WOS:A1992JG02600017 ER PT J AU BEER, MA HAHM, TS AF BEER, MA HAHM, TS TI ATOMIC PHYSICS EFFECTS ON DISSIPATIVE TOROIDAL DRIFT WAVE STABILITY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID GRADIENT-DRIVEN TURBULENCE; TOKAMAK EDGE TURBULENCE; TEXT TOKAMAK; PLASMA; FLUCTUATIONS AB The effects of atomic physics processes such as ionization, charge exchange, and radiation on the linear stability of dissipative drift waves are investigated in toroidal geometry, both numerically and analytically. For typical Tokamak Fusion Test Reactor (TFTR) [Plasma Physics and Controlled Nuclear Fusion Research, 1986 (IAEA, Vienna, 1987), Vol. 1, p. 51] and Texas Experimental Tokamak (TEXT) [Nucl. Technol. Fusion 1, 479 (1981)] edge parameters, overall linear stability is determined by the competition between the destabilizing influence of ionization and the stabilizing effect due to the electron temperature gradient. An analytical expression for the linear marginal stability condition, eta(e)crit, is derived. The instability is most likely to occur at the extreme edge of tokamaks with a significant ionization source and a steep electron density gradient. RP BEER, MA (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 30 TC 13 Z9 13 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD AUG PY 1992 VL 4 IS 8 BP 2567 EP 2576 DI 10.1063/1.860172 PG 10 WC Physics, Fluids & Plasmas SC Physics GA JG026 UT WOS:A1992JG02600020 ER PT J AU YOUNG, PE BERGER, RL ESTABROOK, KG AF YOUNG, PE BERGER, RL ESTABROOK, KG TI MEASUREMENTS OF BACKSCATTERED LIGHT FROM THE INTERACTION OF 0.35 MU-M LASER-LIGHT WITH HIGH-Z TARGETS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID INHOMOGENEOUS-PLASMA; BRILLOUIN-SCATTERING; FILAMENTATION; WAVELENGTH; PULSE; NOISE AB Backscattered light at wavelengths near the incident laser frequency of 0.35-mu-m irradiated 0.4-mu-m thick gold targets has been spectrally and temporally resolved. At the start of the laser pulse, the wavelength of the backscattered light is longer than that of the incident laser, and the wavelength subsequently increases with time. The observed scaling of the backscatter level with the incident laser intensity, the bandwidth of the backscatter spectrum, and the absolute value of the backscatter flux, are adequately described by absolute growth of the stimulated Brillouin scatter instability from thermal noise, provided that realistic hot spots in the incident laser profile are taken into account. The differences between backscattered light from high-Z and low-Z targets are discussed. RP YOUNG, PE (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 27 TC 7 Z9 8 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD AUG PY 1992 VL 4 IS 8 BP 2605 EP 2613 DI 10.1063/1.860176 PG 9 WC Physics, Fluids & Plasmas SC Physics GA JG026 UT WOS:A1992JG02600024 ER PT J AU ABRAHAMSHRAUNER, B ANDERSON, OA AF ABRAHAMSHRAUNER, B ANDERSON, OA TI ION SHEET BEAMS WITH PARABOLIC DENSITY PROFILES SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID VLASOV-MAXWELL EQUATIONS; TIME-DEPENDENT SOLUTIONS; EXACT INVARIANTS AB A model for a warm nonrelativistic ion sheet beam described by a reduced Vlasov-Maxwell approximation is extended to include parabolic beam densities. A single-humped ion distribution function is found analytically for a stationary beam, whose parabolic density at the beam edge is zero. For a special model of a rippled sheet beam with a nonlinear focusing force, the ion distribution function, the condition for a matched beam, and the emittance for the beam are determined. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP ABRAHAMSHRAUNER, B (reprint author), WASHINGTON UNIV,DEPT ELECT ENGN,ST LOUIS,MO 63130, USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD AUG PY 1992 VL 4 IS 8 BP 2634 EP 2639 DI 10.1063/1.860179 PG 6 WC Physics, Fluids & Plasmas SC Physics GA JG026 UT WOS:A1992JG02600027 ER PT J AU SLUTZ, SA AF SLUTZ, SA TI ION DIVERGENCE GENERATED BY NONUNIFORM CURRENT-DENSITY OF INTENSE ION-BEAMS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID DIODES AB Large electric and magnetic fields are generated by the space charge and current of intense ion beams. These fields induce ion divergence if the beam current density is not uniform. Within the accelerating region the deflection of ions due to the electric fields is much larger than ion deflection from the self-magnetic fields. An analytic technique is presented to calculate the electric fields generated by the static nonuniform beam space charge and the resulting ion trajectories during beam acceleration. It is shown that modest nonuniformities in the ion current density can result in significant ion divergence. Downstream of the ion acceleration region, the ion space charge is neutralized by the presence of electrons. Consequently, the self-magnetic field of the beam dominates the ion trajectories in this region. Analytic estimates of the beam divergence produced by the self-magnetic fields indicate that significant ion divergence can be generated by this process as well. A distinguishing feature between these two mechanisms is that the space-charge-induced divergence is largest for perturbation scale lengths smaller than the acceleration gap, while the converse is true for the divergence generated by the self-magnetic field of the beam. Both of these effects place uniformity requirements on ion sources. RP SLUTZ, SA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 13 TC 6 Z9 6 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD AUG PY 1992 VL 4 IS 8 BP 2645 EP 2651 DI 10.1063/1.860181 PG 7 WC Physics, Fluids & Plasmas SC Physics GA JG026 UT WOS:A1992JG02600029 ER PT J AU DECAMP, D DESCHIZEAUX, B GOY, C LEES, JP MINARD, MN ALEMANY, R CRESPO, JM DELFINO, M FERNANDEZ, E GAITAN, V GARRIDO, L MIR, LM PACHECO, A CATANESI, MG CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G GAO, Y HU, H HUANG, D HUANG, X LIN, J LOU, J QIAO, C RUAN, T WANG, T XIE, Y XU, D XU, R ZHANG, J ZHAO, W ATWOOD, WB BAUERDICK, LAT BIRD, F BLUCHER, E BONVICINI, G BOSSI, F BOUDREAU, J BURNETT, TH DREVERMANN, H FORTY, RW GRAB, C HAGELBERG, R HAYWOOD, S HILGART, J JOST, B KASEMANN, M KNOBLOCH, J LACOURT, A LANCON, E LEHRAUS, I LOHSE, T LUSIANI, A MARCHIORO, A MARTINEZ, M MATO, P MENARY, S MEYER, T MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG NASH, J PALAZZI, P RANJARD, F REDLINGER, G ROLANDI, L ROTH, A ROTHBERG, J ROTSCHEIDT, H SAICH, M SCHLATTER, D SCHMELLING, M TEJESSY, W WACHSMUTH, H WASSERBAECH, S WIEDENMANN, W WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M BENCHEIKH, AM ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HARVEY, J HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PRORIOL, J PRULHIERE, F STIMPFL, G HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I SIMOPOULOU, E VAYAKI, A BADIER, J BLONDEL, A BONNEAUD, G BOUROTTE, J BRAEMS, F BRIENT, JC FOUQUE, G GAMESS, A GUIRLET, R ORTEU, S ROSOWSKY, A ROUGE, A RUMPF, M TANAKA, R VIDEAU, H CANDLIN, DJ VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G CAMPANA, P CAPON, G CERRUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P ZOGRAFOU, P ALTOON, B BOYLE, O HALLEY, AW TENHAVE, L HEARNS, JL LYNCH, JG MORTON, WT RAINE, C SCARR, JM SMITH, K THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEIGES, R GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M DORNAN, PJ DUGEAY, S GREENE, AM HASSARD, JF LIESKE, NM PATTON, SJ PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TAYLOR, G TOMALIN, IR WRIGHT, AG GIRTLER, P KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G KEEMER, NR NUTTALL, M PATEL, A ROWLINGSON, BS SLOAN, T SNOW, SW WHELAN, EP BARCZEWSKI, T KLEINKNECHT, K RAAB, J RENK, B ROEHN, S SANDER, HG SCHMIDT, H STEEG, F WALTHER, SM WOLF, B AUBERT, JJ BENCHOUK, C BERNARD, V BONISSENT, A CARR, J COYLE, P DRINKARD, J ETIENNE, F PAPALEXIOU, S PAYRE, P PIETRZYK, B QIAN, Z ROUSSEAU, D SCHWEMLING, P TALBY, M ADLUNG, S BECKER, H BLUM, W BROWN, D CATTANEO, P COWAN, G DEHNING, B DIETL, H DYDAK, F FERNANDEZBOSMAN, M HANSLKOZANECKA, T JAHN, A KOZANECKI, W LANGE, E LAUBER, J LUTJENS, G LATZ, G MANNER, W PAN, Y RICHTER, R SCHRODER, J SCHWARZ, AS SETTLES, R STIERLIN, U STDENIS, R TAKASHIMA, M THOMAS, J WOLF, G BERTIN, V BOUCROT, J CALLOT, O CHEN, X CORDIER, A DAVIER, M GANIS, G GRIVAZ, JF HEUSSE, P JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM VEILLET, JJ VIDEAU, I ZHANG, Z ZOMER, F ABBANEO, D AMENDOLIA, SR BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BRADASCHIA, C CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GATTO, C GIASSI, A GIORGI, MA LIGABUE, F MANNELLI, EB MARROCCHESI, PS MESSINEO, A PALLA, F SANGUINETTI, G STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J CARTER, JM GREEN, MG MARCH, PV MEDCALF, T QUAZI, IS STRONG, JA THOMAS, RM WEST, LR WILDISH, T BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P LOCCI, E LOUCATOS, S MONNIER, E PEREZ, P PERLAS, JA PERRIER, F RANDER, J RENARDY, JF ROUSSARIE, A SCHULLER, JP SCHWINDLING, J VALLAGE, B ASHMAN, JG BOOTH, CN BUTTAR, C CARNEY, R CARTWRIGHT, S COMBLEY, F DINSDALE, M DOGRU, M HATFIELD, F MARTIN, J PARKER, D REEVES, P THOMPSON, LF BARBERIO, E BRANDT, S GRUPEN, C MEINHARD, H MIRABITO, L SCHAFER, U SEYWERD, H GIANNINI, G GOBBO, B RAGUSA, F STIEGLER, U BELLANTONI, L CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JARED, RC JOHNSON, RP LECLAIRE, BW LISHKA, C PAN, YB PATER, JR SAADI, Y SHARMA, V SHI, ZH TANG, YH WALSH, AM WEAR, JA WEBER, FV WHITNEY, MH WU, SL ZOBERNIG, G AF DECAMP, D DESCHIZEAUX, B GOY, C LEES, JP MINARD, MN ALEMANY, R CRESPO, JM DELFINO, M FERNANDEZ, E GAITAN, V GARRIDO, L MIR, LM PACHECO, A CATANESI, MG CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G GAO, Y HU, H HUANG, D HUANG, X LIN, J LOU, J QIAO, C RUAN, T WANG, T XIE, Y XU, D XU, R ZHANG, J ZHAO, W ATWOOD, WB BAUERDICK, LAT BIRD, F BLUCHER, E BONVICINI, G BOSSI, F BOUDREAU, J BURNETT, TH DREVERMANN, H FORTY, RW GRAB, C HAGELBERG, R HAYWOOD, S HILGART, J JOST, B KASEMANN, M KNOBLOCH, J LACOURT, A LANCON, E LEHRAUS, I LOHSE, T LUSIANI, A MARCHIORO, A MARTINEZ, M MATO, P MENARY, S MEYER, T MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG NASH, J PALAZZI, P RANJARD, F REDLINGER, G ROLANDI, L ROTH, A ROTHBERG, J ROTSCHEIDT, H SAICH, M SCHLATTER, D SCHMELLING, M TEJESSY, W WACHSMUTH, H WASSERBAECH, S WIEDENMANN, W WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M BENCHEIKH, AM ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HARVEY, J HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PRORIOL, J PRULHIERE, F STIMPFL, G HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I SIMOPOULOU, E VAYAKI, A BADIER, J BLONDEL, A BONNEAUD, G BOUROTTE, J BRAEMS, F BRIENT, JC FOUQUE, G GAMESS, A GUIRLET, R ORTEU, S ROSOWSKY, A ROUGE, A RUMPF, M TANAKA, R VIDEAU, H CANDLIN, DJ VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G CAMPANA, P CAPON, G CERRUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P ZOGRAFOU, P ALTOON, B BOYLE, O HALLEY, AW TENHAVE, L HEARNS, JL LYNCH, JG MORTON, WT RAINE, C SCARR, JM SMITH, K THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEIGES, R GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M DORNAN, PJ DUGEAY, S GREENE, AM HASSARD, JF LIESKE, NM PATTON, SJ PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TAYLOR, G TOMALIN, IR WRIGHT, AG GIRTLER, P KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G KEEMER, NR NUTTALL, M PATEL, A ROWLINGSON, BS SLOAN, T SNOW, SW WHELAN, EP BARCZEWSKI, T KLEINKNECHT, K RAAB, J RENK, B ROEHN, S SANDER, HG SCHMIDT, H STEEG, F WALTHER, SM WOLF, B AUBERT, JJ BENCHOUK, C BERNARD, V BONISSENT, A CARR, J COYLE, P DRINKARD, J ETIENNE, F PAPALEXIOU, S PAYRE, P PIETRZYK, B QIAN, Z ROUSSEAU, D SCHWEMLING, P TALBY, M ADLUNG, S BECKER, H BLUM, W BROWN, D CATTANEO, P COWAN, G DEHNING, B DIETL, H DYDAK, F FERNANDEZBOSMAN, M HANSLKOZANECKA, T JAHN, A KOZANECKI, W LANGE, E LAUBER, J LUTJENS, G LATZ, G MANNER, W PAN, Y RICHTER, R SCHRODER, J SCHWARZ, AS SETTLES, R STIERLIN, U STDENIS, R TAKASHIMA, M THOMAS, J WOLF, G BERTIN, V BOUCROT, J CALLOT, O CHEN, X CORDIER, A DAVIER, M GANIS, G GRIVAZ, JF HEUSSE, P JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM VEILLET, JJ VIDEAU, I ZHANG, Z ZOMER, F ABBANEO, D AMENDOLIA, SR BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BRADASCHIA, C CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GATTO, C GIASSI, A GIORGI, MA LIGABUE, F MANNELLI, EB MARROCCHESI, PS MESSINEO, A PALLA, F SANGUINETTI, G STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J CARTER, JM GREEN, MG MARCH, PV MEDCALF, T QUAZI, IS STRONG, JA THOMAS, RM WEST, LR WILDISH, T BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P LOCCI, E LOUCATOS, S MONNIER, E PEREZ, P PERLAS, JA PERRIER, F RANDER, J RENARDY, JF ROUSSARIE, A SCHULLER, JP SCHWINDLING, J VALLAGE, B ASHMAN, JG BOOTH, CN BUTTAR, C CARNEY, R CARTWRIGHT, S COMBLEY, F DINSDALE, M DOGRU, M HATFIELD, F MARTIN, J PARKER, D REEVES, P THOMPSON, LF BARBERIO, E BRANDT, S GRUPEN, C MEINHARD, H MIRABITO, L SCHAFER, U SEYWERD, H GIANNINI, G GOBBO, B RAGUSA, F STIEGLER, U BELLANTONI, L CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JARED, RC JOHNSON, RP LECLAIRE, BW LISHKA, C PAN, YB PATER, JR SAADI, Y SHARMA, V SHI, ZH TANG, YH WALSH, AM WEAR, JA WEBER, FV WHITNEY, MH WU, SL ZOBERNIG, G TI SEARCHES FOR NEW PARTICLES IN Z-DECAYS USING THE ALEPH DETECTOR SO PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS LA English DT Review ID NEUTRAL HIGGS BOSON; SUPERSYMMETRIC STANDARD MODEL; ELECTRON-POSITRON-ANNIHILATION; CERN PBARP COLLIDER; HADRONIC Z-DECAYS; LUND MONTE-CARLO; RADIATIVE-CORRECTIONS; PAIR PRODUCTION; E+E ANNIHILATION; MASS LIMITS AB During 1989 and 1990 over 200 000 hadronic and leptonic events, corresponding to about 8.5 pb-1 of data, were collected in a scan of the Z peak using the ALEPH detector at the e+ e- collider, LEP. These data, at the highest centre-of-mass energy available to date in e+ e- collisions, have allowed a broad range of searches for new particles and new phenomena to be performed in a mass range significantly higher than previously attainable. The searches performed by ALEPH for Higgs bosons, supersymmetric particles and leptoquarks, and for evidence of compositeness are reviewed. No positive signals have been observed but a comprehensive set of mass and coupling limits is presented. Branching ratio limits are given for a number of "rare" Z decays. C1 CENS,DEPT PHYS PARTICULES ELEMENTAIRES,F-91191 GIF SUR YVETTE,FRANCE. STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RUTHERFORD APPLETON LAB,DEPT PARTICLE PHYS,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV LONDON,ROYAL HOLLOWAY & BEDFORD NEW COLL,DEPT PHYS,SURREY TW20 0EX,ENGLAND. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. UNIV SHEFFIELD,DEPT PHYS,SHEFFIELD S3 7RH,S YORKSHIRE,ENGLAND. UNIV TURIN,IST FIS GEN,I-10124 TURIN,ITALY. UNIV PISA,IST NAZL FIS NUCL,DIPARTIMENTO FIS,I-56100 PISA,ITALY. UNIV PARIS 11,CNRS,INST NATL PHYS NUCL & PHYS PARTICULES,LAB ACCELERATEUR LINEAIRE,F-91405 ORSAY,FRANCE. MAX PLANCK INST PHYS & ASTROPHYS,WERNER HEISENBERG INST PHYS,W-8000 MUNICH 40,GERMANY. FAC SCI LUMINY,CNRS,INST NATL PHYS NUCL & PHYS PARTICULES,CTR PHYS PARTICULES,F-13288 MARSEILLE,FRANCE. UNIV SIEGEN,FACHBEREICH PHYS,W-5900 SIEGEN,GERMANY. UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. IST NAZL FIS NUCL,I-34127 TRIESTE,ITALY. UNIV GLASGOW,DEPT PHYS & ASTRON,GLASGOW G12 8QQ,SCOTLAND. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,DEPT PHYS,LONDON SW7 2BZ,ENGLAND. UNIV AUTONOMA BARCELONA,FIS ALTAS ENERGIAS LAB,E-08193 BARCELONA,SPAIN. IST NAZL FIS NUCL,I-70126 BARI,ITALY. CNR,IST COSMOGEOFIS,TURIN,ITALY. UNIV BARI,DIPARTIMENTO FIS,I-70126 BARI,ITALY. CHINESE ACAD SCI,INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA. CERN,DIV PPE,CH-1211 GENEVA 23,SWITZERLAND. UNIV FLORENCE,DIPARTIMENTO FIS,I-50125 FLORENCE,ITALY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. UNIV CLERMONT FERRAND,CNRS,INST NATL PHYS NUCL & PHYS PARTICULES,PHYS CORPUSCULAIRE LAB,F-63177 CLERMONT FERRAND,FRANCE. UNIV INNSBRUCK,INST EXPTL PHYS,A-6020 INNSBRUCK,AUSTRIA. NIELS BOHR INST,COPENHAGEN,DENMARK. FLORIDA STATE UNIV,SUPERCOMP COMPUTAT RES INST,TALLAHASSEE,FL 32306. UNIV WASHINGTON,SEATTLE,WA 98195. DEMOCRITOS NUCL RES CTR,ATHENS,GREECE. FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. ECOLE POLYTECH,CNRS,INST NATL PHYS NUCL & PHYS PARTICULES,F-91128 PALAISEAU,FRANCE. UNIV HEIDELBERG,INST HOCHENERGIEPHYS,W-6900 HEIDELBERG,GERMANY. UNIV EDINBURGH,DEPT PHYS,EDINBURGH EH9 3JZ,MIDLOTHIAN,SCOTLAND. UNIV LANCASTER,DEPT PHYS,LANCASTER LA1 4YB,ENGLAND. IST NAZL FIS NUCL,I-50125 FLORENCE,ITALY. UNIV MAINZ,INST PHYS,W-6500 MAINZ,GERMANY. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. RP DECAMP, D (reprint author), CNRS,INST NATL PHYS NUCL & PHYS PARTICULES,LAB ANNECY PHYS PARTICULES,F-74019 ANNECY LE VIEUX,FRANCE. RI Buttar, Craig/D-3706-2011; Stahl, Achim/E-8846-2011; Passalacqua, Luca/F-5127-2011; St.Denis, Richard/C-8997-2012; Forti, Francesco/H-3035-2011; Venturi, Andrea/J-1877-2012; Perrier, Frederic/A-5953-2011; Rolandi, Luigi (Gigi)/E-8563-2013; Colas, Paul/F-2876-2013; Delfino, Manuel/A-1545-2012; Bosman, Martine/J-9917-2014; Fernandez, Enrique/L-5387-2014; ANTONELLI, ANTONELLA/C-6238-2011; Mir, Lluisa-Maria/G-7212-2015; ciocci, maria agnese /I-2153-2015; Hansen, John/B-9058-2015; Lusiani, Alberto/N-2976-2015; Marrocchesi, Pier Simone/N-9068-2015; Lusiani, Alberto/A-3329-2016; Murtas, Fabrizio/B-5729-2012; Booth, Christopher/B-5263-2016; Pacheco Pages, Andres/C-5353-2011; Ferrante, Isidoro/F-1017-2012 OI Stahl, Achim/0000-0002-8369-7506; Forti, Francesco/0000-0001-6535-7965; Rolandi, Luigi (Gigi)/0000-0002-0635-274X; Delfino, Manuel/0000-0002-9468-4751; Bosman, Martine/0000-0002-7290-643X; Fernandez, Enrique/0000-0002-6405-9488; Mir, Lluisa-Maria/0000-0002-4276-715X; ciocci, maria agnese /0000-0003-0002-5462; Hansen, John/0000-0002-8422-5543; Lusiani, Alberto/0000-0002-6876-3288; Marrocchesi, Pier Simone/0000-0003-1966-140X; Lusiani, Alberto/0000-0002-6876-3288; Booth, Christopher/0000-0002-6051-2847; Pacheco Pages, Andres/0000-0001-8210-1734; Ferrante, Isidoro/0000-0002-0083-7228 NR 174 TC 283 Z9 283 U1 1 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-1573 J9 PHYS REP JI Phys. Rep.-Rev. Sec. Phys. Lett. PD AUG PY 1992 VL 216 IS 5-6 BP 253 EP 340 PG 88 WC Physics, Multidisciplinary SC Physics GA JJ577 UT WOS:A1992JJ57700001 ER PT J AU ATTWOOD, D AF ATTWOOD, D TI NEW OPPORTUNITIES AT SOFT-X-RAY WAVELENGTHS SO PHYSICS TODAY LA English DT Article ID SYNCHROTRON RADIATION C1 UNIV CALIF BERKELEY,COLL ENGN,BERKELEY,CA 94720. RP ATTWOOD, D (reprint author), LAWRENCE BERKELEY LAB,CTR X-RAY OPT,BERKELEY,CA 94720, USA. NR 27 TC 12 Z9 14 U1 1 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD AUG PY 1992 VL 45 IS 8 BP 24 EP 31 DI 10.1063/1.881314 PN 1 PG 8 WC Physics, Multidisciplinary SC Physics GA JH095 UT WOS:A1992JH09500011 ER PT J AU BURR, B BURR, FA MATZ, EC ROMEROSEVERSON, J AF BURR, B BURR, FA MATZ, EC ROMEROSEVERSON, J TI PINNING DOWN LOOSE ENDS - MAPPING TELOMERES AND FACTORS AFFECTING THEIR LENGTH SO PLANT CELL LA English DT Article ID RECOMBINANT INBREDS; T7 DNA; MAIZE; ELECTROPHORESIS; QUANTITATION; ELONGATION; ENZYME; YEAST; GENE; GELS AB A degenerately repeated sequence, proximal to the telomere heptanucleotide repeat in maize, contains restriction enzyme sites that permit the separation of telomeres from the rest of the chromosomes. Probing with a telomere-specific oligonucleotide revealed genotype-dependent telomere lengths that vary more than 25-fold in maize among the 22 inbreds that have been surveyed. These lengths were found to segregate reproducibly in a recombinant inbred family where 50% of the variation can be accounted for by three loci. The dynamic control over telomere length in maize appears to act rapidly to achieve new genotypically determined telomere lengths in the F1. Clones of telomere proximal sequences were used to map restriction fragment length loci at the distal ends of eight of 20 chromosome arms. C1 AGRIGENET CO,MADISON,WI 53716. RP BURR, B (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. RI Romero-Severson, Jeanne/B-5259-2011 OI Romero-Severson, Jeanne/0000-0003-4112-7238 NR 32 TC 78 Z9 83 U1 0 U2 2 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 1040-4651 J9 PLANT CELL JI Plant Cell PD AUG PY 1992 VL 4 IS 8 BP 953 EP 960 PG 8 WC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology SC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology GA JK721 UT WOS:A1992JK72100010 PM 1356536 ER PT J AU WARREN, WE AF WARREN, WE TI THE LARGE DEFORMATION ELASTIC RESPONSE OF WOVEN KEVLAR FABRIC SO POLYMER COMPOSITES LA English DT Article; Proceedings Paper CT SYMP ON MECHANICS OF PLASTICS AND PLASTIC COMPOSITES, AT THE 1991 WINTER ANNUAL MEETING OF THE AMERICAN SOC OF MECHANICAL ENGINEERS CY DEC, 1991 CL ATLANTA, GA SP AMER SOC MECH ENGINEERS, APPL MECH DIV, AMER SOC MECH ENGINEERS, MAT DIV, AMER SOC MECH ENGINEERS, PROD ENGN DIV AB The large deformation elastic response of a plane woven Kevlar fabric is investigated analytically and experimentally. The analysis assumes the undeformed geometry to be a sequence of interlaced arcs of circles that reverse at each yam midpoint, and each yarn is modeled as an extensible elastica subject to certain compatibility conditions. Deflection-force relations for the fabric are determined in terms of the initial weave geometry and the elastic properties of the individual yarns. The theoretical results agree well with the results of experiments performed on a fabric woven from 400 denier Kevlar yams under conditions of uniaxial loading in both warp and fill directions. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP WARREN, WE (reprint author), TEXAS A&M UNIV SYST,COLLEGE STN,TX 77843, USA. NR 13 TC 4 Z9 5 U1 0 U2 0 PU SOC PLASTICS ENG INC PI BROOKFIELD CENTER PA 14 FAIRFIELD DR, BROOKFIELD CENTER, CT 06804-0403 SN 0272-8397 J9 POLYM COMPOSITE JI Polym. Compos. PD AUG PY 1992 VL 13 IS 4 BP 278 EP 284 DI 10.1002/pc.750130405 PG 7 WC Materials Science, Composites; Polymer Science SC Materials Science; Polymer Science GA JH951 UT WOS:A1992JH95100004 ER PT J AU TRIVEDI, B SHAH, VH AF TRIVEDI, B SHAH, VH TI SYNTHESIS AND ANTIMICROBIAL ACTIVITY OF 2-ARYL-3-(BENZOTHIAZOL-2'-YL-THIOACETAMIDO)-5-H METHYL CARBOXYMETHYL-4-THIAZOLIDINONES SO PROCEEDINGS OF THE INDIAN ACADEMY OF SCIENCES-CHEMICAL SCIENCES LA English DT Article DE 4-THIAZOLIDINONE, 2-SUBSTITUTED BENZAL HYDRAZINO CARBONYL METHYLTHIO-BENZOTHIAZOL; ANTITUBERCULAR ACTIVITY; ANTIMICROBIAL ACTIVITY AB A series of new 4-thiazolidinones have been synthesized from 2-[S-(benzothiazol-2')]-mercapto acetic hydrazide (I) as starting material. The reaction mechanism has been examined. These biheterocycles and their precursors were screened for their antimicrobial activity against different strains and were also screened for antitubercular activity. C1 SAVANNAH RIVER ECOL LAB,DEPT CHEM,AIKEN,SC 29801. NR 12 TC 0 Z9 0 U1 0 U2 0 PU INDIAN ACADEMY SCIENCES PI BANGALORE PA P B 8005 C V RAMAN AVENUE, BANGALORE 560 080, INDIA SN 0253-4134 J9 P INDIAN AS-CHEM SCI JI Proc. Indian Acad. Sci.-Chem. Sci. PD AUG PY 1992 VL 104 IS 4 BP 489 EP 496 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA JH745 UT WOS:A1992JH74500007 ER PT J AU MATH, SK HEARST, JE POULTER, CD AF MATH, SK HEARST, JE POULTER, CD TI THE CRTE GENE IN ERWINIA-HERBICOLA ENCODES GERANYLGERANYL DIPHOSPHATE SYNTHASE SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE CAROTENOIDS; BIOSYNTHESIS; EXPRESSION; PRENYLTRANSFERASE ID FARNESYL PYROPHOSPHATE SYNTHETASE; 1'-4 COUPLING REACTION; ESCHERICHIA-COLI; CAROTENOID BIOSYNTHESIS; SACCHAROMYCES-CEREVISIAE; SQUALENE SYNTHETASE; MOLECULAR-CLONING; RAT-LIVER; EXPRESSION; MUTANTS AB A cluster of genes essential for the biosynthesis of carotenoids in Erwinia herbicola has been isolated and characterized [Armstrong, G. A., Alberti, M. & Hearst, J. E. (1990) Proc. Natl. Acad. Sci. USA 87,9975-9979]. Related gene clusters are found in other carotenoid-producing bacteria. Two of these genes, crtB and crtE, have been assigned to enzymes responsible for conversion of geranylgeranyl diphosphate (GGPP) to prephytoene diphosphate and prephytoene diphosphate to phytoene, respectively. We isolated crtE from the Er. herbicola cluster by PCR amplification and cloned the coding region into the Escherichia coli expression vector pARC306N. Es. coli JM101 was transformed with the expression plasmid, and transformants were assayed for GGPP synthase and phytoene synthase activity. Extracts from JM101/pSM145 accumulated [C-14]GGPP when incubated with [C-14]isopentenyl diphosphate and farnesyl diphosphate, whereas similar incubations with [H-3]GGPP did not yield prephytoene diphosphate or phytoene. Thus, crtE encodes GGPP synthase. C1 UNIV UTAH,DEPT CHEM,SALT LAKE CITY,UT 84112. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM DYNAM,BERKELEY,CA 94720. FU NIGMS NIH HHS [GM 21328] NR 26 TC 78 Z9 82 U1 0 U2 3 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD AUG 1 PY 1992 VL 89 IS 15 BP 6761 EP 6764 DI 10.1073/pnas.89.15.6761 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JF856 UT WOS:A1992JF85600021 PM 1495965 ER PT J AU FARMER, JC WANG, FT LEWIS, PR SUMMERS, LJ AF FARMER, JC WANG, FT LEWIS, PR SUMMERS, LJ TI ELECTROCHEMICAL TREATMENT OF MIXED AND HAZARDOUS WASTES - OXIDATION OF ETHYLENE-GLYCOL BY COBALT (III) AND IRON (III) SO PROCESS SAFETY AND ENVIRONMENTAL PROTECTION LA English DT Article AB In the future, Mediated Electrochemical Oxidation (MEO) may be used for the ambient temperature destruction of hazardous waste and for the conversion of mixed waste to low-level radioactive waste. We have studied the complete MEO of ethylene glycol, a surrogate waste, by Co(III) and Fe(III). The reactor had a rotating-cylinder anode that was operated well below the limiting current for mediator generation. Rates of CO2 evolution were measured and used to calculate both destruction and current efficiencies for the process. Gas chromatography with mass spectrometry (GC/MS) was used to identify several reaction intermediates. A simple reactor model has been developed to explain the time dependence of CO2 evolution (conversion-time curves). RP FARMER, JC (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 0 TC 8 Z9 8 U1 0 U2 2 PU INST CHEMICAL ENGINEERS PI RUGBY PA 165-171 RAILWAY TERRACE GEORGE E DAVIS BLDG, RUGBY, ENGLAND CV21 3HQ SN 0957-5820 J9 PROCESS SAF ENVIRON JI Process Saf. Environ. Protect. PD AUG PY 1992 VL 70 IS B3 BP 158 EP 164 PG 7 WC Engineering, Environmental; Engineering, Chemical SC Engineering GA JT503 UT WOS:A1992JT50300010 ER PT J AU DOBSON, JE AF DOBSON, JE TI GEOGRAPHICAL INFORMATION-SYSTEMS - PRINCIPLES AND APPLICATIONS - MAGUIRE,DJ, GOODCHILD,MF, RHIND,DW SO PROFESSIONAL GEOGRAPHER LA English DT Book Review DE GEOGRAPHY; GEOGRAPHIC(AL) INFORMATION SYSTEMS (GIS); SPATIAL ANALYSIS; CARTOGRAPHY; REMOTE SENSING; INFORMATION TECHNOLOGY RP DOBSON, JE (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37830, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU BLACKWELL PUBLISHERS PI CAMBRIDGE PA 350 MAIN STREET, STE 6, CAMBRIDGE, MA 02148-5023 SN 0033-0124 J9 PROF GEOGR JI Prof. Geogr. PD AUG PY 1992 VL 44 IS 3 BP 358 EP 359 PG 2 WC Geography SC Geography GA JJ222 UT WOS:A1992JJ22200021 ER PT J AU VERDERBER, R AF VERDERBER, R TI THE HIGH-FREQUENCY FLUORESCENT LAMP SYSTEM SO PROGRESSIVE ARCHITECTURE LA English DT Article RP VERDERBER, R (reprint author), LAWRENCE BERKELEY LAB,LIGHTING SYST RES GRP,BERKELEY,CA 94720, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU PENTON PUBL INC PI CLEVELAND PA 1100 SUPERIOR AVE, CLEVELAND, OH 44114 SN 0033-0752 J9 PROG ARCHIT JI Progress. Archit. PD AUG PY 1992 VL 73 IS 8 BP 97 EP 100 PG 4 WC Architecture SC Architecture GA JJ570 UT WOS:A1992JJ57000026 ER PT J AU GIACCIA, AJ SCHWARTZ, J SHIEH, J BROWN, JM AF GIACCIA, AJ SCHWARTZ, J SHIEH, J BROWN, JM TI THE USE OF ASYMMETRIC-FIELD INVERSION GEL-ELECTROPHORESIS TO PREDICT TUMOR-CELL RADIOSENSITIVITY SO RADIOTHERAPY AND ONCOLOGY LA English DT Article DE ASYMMETRIC FIELD INVERSION GEL ELECTROPHORESIS; INTRINSIC RADIOSENSITIVITY; DNA REJOINING; PREDICTIVE ASSAY ID DOUBLE-STRAND BREAKS; RADIOBIOLOGICAL CHARACTERIZATION; RADIATION SENSITIVITY; FILTER ELUTION; DNA BREAKS; REPAIR; HEAD; NECK; RADIOTHERAPY; LINES AB The success of a predictive assay for radiotherapy relies on the use of one or more tumor cell traits that equate with tumor radioresistance or radiosensitivity. These traits can be divided into intrinsic (genetic) and extrinsic (epi-genetic) factors. Most probably, a tumor's response to radiotherapy will be influenced by both of these sets of traits. Radiobiological analysis of cultured cells derived from explanted tumors of head and neck patients has shown that in vitro survival of tumor cells is not the only factor affecting tumor radiocurability. Two possible reasons are the high degree of selection involved in growing the cells in vitro and the inability to assess the contribution of the cell-cell contact effect with cultured cells. A possible means of overcoming both of these problems would be an assessment of the radiosensitivity of the cell population immediately after removal from the tumor. Since a good correlation exists between intrinsic cellular radioresistance and DNA double-strand break repair (DSBR) as assayed by the Neutral Elution technique [21], we have investigated the feasibility of using asymmetric field inversion gel electrophoresis (AFIGE) in identifying resistant tumor cells in vitro. AFIGE has several advantages over neutral elution in that it is faster (approximately 60-80 samples can be run on the same agarose gel) and, most importantly, one can visualize DNA damage and repair by staining the DNA with ethidium bromide. Analysis of five squamous cell carcinoma cell lines derived from head and neck cancers and one normal human fibroblast fine showed a significant correlation (r2 = 0.92, p less-than-or-equal-to 0.006) between their extent of DSBR after one hour of repair following 10 Gy of ionizing radiation and their radiosensitivity (D0, SF2 Gy). This correlation between DSBR kinetics and radiosensitivity was independent of dose, and there was no correlation between radiosensitivity and damage induction. Thus, AFIGE may overcome some of the problems of clonogenic assays in determining tumor radiosensitivity, particularly if combined with a technique to determine the oxygen profile of individual tumors. C1 ARGONNE NATL LAB,DIV BIOL & MED,ARGONNE,IL 60439. UNIV CHICAGO,MED CTR,DEPT RADIAT & CELLULAR ONCOL,CHICAGO,IL 60637. RP GIACCIA, AJ (reprint author), STANFORD UNIV,MED CTR,SCH MED,DEPT RADIAT ONCOL,CBRL,RM GK115,STANFORD,CA 94305, USA. FU NCI NIH HHS [CA 42596, CA 15201] NR 31 TC 47 Z9 48 U1 0 U2 0 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0167-8140 J9 RADIOTHER ONCOL JI Radiother. Oncol. PD AUG PY 1992 VL 24 IS 4 BP 231 EP 238 DI 10.1016/0167-8140(92)90229-N PG 8 WC Oncology; Radiology, Nuclear Medicine & Medical Imaging SC Oncology; Radiology, Nuclear Medicine & Medical Imaging GA JN425 UT WOS:A1992JN42500004 PM 1410578 ER PT J AU RODRIGUEZ, M ALVAREZ, RA AF RODRIGUEZ, M ALVAREZ, RA TI TRIGGER UNIT FOR SYSTEMS THAT USE DIODE-LASERS MOUNTED ON A CLOSED-CYCLE REFRIGERATOR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Note AB Impact shocks produced by the closed-cycle refrigerator produce jitter in the output frequency of a diode laser. An electronic device is described which allows triggering of the data acquisition system when the influence of the vibration-induced noise is at a minimum. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP RODRIGUEZ, M (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD AUG PY 1992 VL 63 IS 8 BP 4014 EP 4015 DI 10.1063/1.1143259 PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JF720 UT WOS:A1992JF72000038 ER PT J AU ORTIZ, ME CHAVEZ, ER DACAL, A DELCAMPO, JG CHAN, YD STOKSTAD, RG AF ORTIZ, ME CHAVEZ, ER DACAL, A DELCAMPO, JG CHAN, YD STOKSTAD, RG TI THE N-14 + B-10 SYSTEM MEASURED AT E(N-14) = 248 MEV SO REVISTA MEXICANA DE FISICA LA English DT Article ID FUSION CROSS-SECTIONS; EQUILIBRIUM; COLLISIONS; RESIDUES; ONSET AB Total and differential cross sections for reactions induced by N-14 on B-10 have been measured at a N-14 bombarding energy of 248 MeV (approximately 18 MeV/A) for products from Z = 3 to 11. The study of saturation effects on the angular momentum and the identification of the non fusion cross sections constitute the aim of the present work. Energy, angular and Z distributions are presented and compared to Hauser-Feshbach calculations for the fusion components and a sum rule model for the non-fusion components. The extracted critical angular momentum is 21 +/- 2hBAR and is the same as at lower energies. The experimental total reaction cross section is in agreement with an optical model calculation. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP ORTIZ, ME (reprint author), UNIV NACL AUTONOMA MEXICO,INST FIS,APARTADO POSTAL 20-364,MEXICO CITY 01000,DF,MEXICO. NR 28 TC 0 Z9 0 U1 0 U2 0 PU SOCIEDAD MEXICANA DE FISICA PI COYOACAN PA APARTADO POSTAL 70-348, COYOACAN 04511, MEXICO SN 0035-001X J9 REV MEX FIS JI Rev. Mex. Fis. PD AUG PY 1992 VL 38 IS 4 BP 543 EP 552 PG 10 WC Physics, Multidisciplinary SC Physics GA JJ544 UT WOS:A1992JJ54400004 ER PT J AU GEORGE, EP LIU, CT POPE, DP AF GEORGE, EP LIU, CT POPE, DP TI ENVIRONMENTAL EMBRITTLEMENT - THE MAJOR CAUSE OF ROOM-TEMPERATURE BRITTLENESS IN POLYCRYSTALLINE NI3AL SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID INTERGRANULAR HYDROGEN EMBRITTLEMENT; INTERMETALLIC COMPOUND NI3AL; DUCTILITY; FRACTURE; BORON; FEAL; STRENGTH; STRESS; ALLOYS; NI3SI C1 UNIV PENN,DEPT MAT SCI & ENGN,PHILADELPHIA,PA 19104. 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 41 TC 103 Z9 107 U1 1 U2 7 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 AUG 1 PY 1992 VL 27 IS 3 BP 365 EP 370 DI 10.1016/0956-716X(92)90527-L PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JB442 UT WOS:A1992JB44200022 ER PT J AU KRAMBROCK, K LINDE, M SPAETH, JM LOOK, DC BLISS, D WALUKIEWICZ, W AF KRAMBROCK, K LINDE, M SPAETH, JM LOOK, DC BLISS, D WALUKIEWICZ, W TI ARSENIC ANTISITE-RELATED DEFECTS IN LOW-TEMPERATURE MBE GROWN GAAS SO SEMICONDUCTOR SCIENCE AND TECHNOLOGY LA English DT Article ID BEAM-EPITAXIAL GAAS; EL2 AB GaAs layers grown by the molecular beam epitaxy (MBE) method at low temperatures (200-degrees-C) and also MBE samples grown at 300-degrees-C highly doped with Be or Si show high concentrations of As antisite-related defects in the optical absorption and in the magnetic circular dichroism of the absorption (MCDA). With optical detection of EPR it is shown that these antisite-related defects have properties similar to those of the EL2 defects except for the EL2 bleaching characteristics and the so called zero phonon line. Their spin-lattice relaxation time is strongly reduced compared with that of EL2+. These differences may be related to their high concentrations, which are of the order of approximately 10(19)-10(20) cm-3. In MBE samples grown at higher temperatures (325-degrees-C, 400-degrees-C) a new As antisite-related defect was detected with a reduced As-75 hyperfine splitting as compared with that of EL2+. This new As antisite-related defect has properties very similar to those of another As antisite-related defect previously detected in horizontal Bridgman n-type GaAs. A comparison of four different As antisite-related defects with similar reduced As-75 hyperfine splittings is presented. C1 WRIGHT STATE UNIV,DEPT PHYS,DAYTON,OH 45435. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP KRAMBROCK, K (reprint author), UNIV GESAMTHSCH PADERBORN,FACHBEREICH PHYS,WARBURGER STR 100A,W-4790 PADERBORN,GERMANY. NR 18 TC 44 Z9 44 U1 0 U2 7 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0268-1242 J9 SEMICOND SCI TECH JI Semicond. Sci. Technol. PD AUG PY 1992 VL 7 IS 8 BP 1037 EP 1041 DI 10.1088/0268-1242/7/8/002 PG 5 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA JK039 UT WOS:A1992JK03900002 ER PT J AU COFFEY, MW AF COFFEY, MW TI PHASE-SPACE ANALYSIS FOR THE DIRECT ALGEBRAIC-METHOD FOR NONLINEAR EVOLUTION AND WAVE-EQUATIONS SO SIAM JOURNAL ON APPLIED MATHEMATICS LA English DT Article DE PHASE SPACE; NONLINEAR AND AUTONOMOUS DIFFERENTIAL EQUATIONS; KDV-LIKE EQUATIONS ID NON-LINEAR EVOLUTION; VRIES EQUATION; FIELD-THEORY; HEAT PULSES; KORTEWEG; PROPAGATION; EXPANSIONS; DIFFUSION; REDUCTION; SOLIDS AB The basis of the direct algebraic method employing a series in real exponential functions for solving nonlinear evolution and wave equations is examined in terms of the general theory of autonomous ordinary differential equations (ODEs) and phase space analysis. The closed form solutions obtained by the direct algebraic method are identified with special trajectories in phase space that connect a critical point to itself or other critical points. The phase portrait is investigated for ODEs resulting from a combined KdV and mKdV equation, a KdV-like equation with fifth-degree nonlinearity, a special case of the Calogero-Degasperis-Fokas modified mKdV equation, and a generalized Fisher equation. The phase space analysis serves to clarify and partially justify the direct algebraic method. C1 IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS & ASTRON, AMES, IA 50011 USA. RP COFFEY, MW (reprint author), IOWA STATE UNIV SCI & TECHNOL, US DOE, AMES LAB, AMES, IA 50011 USA. NR 58 TC 6 Z9 6 U1 0 U2 1 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 USA SN 0036-1399 J9 SIAM J APPL MATH JI SIAM J. Appl. Math. PD AUG PY 1992 VL 52 IS 4 BP 929 EP 945 DI 10.1137/0152053 PG 17 WC Mathematics, Applied SC Mathematics GA JG897 UT WOS:A1992JG89700002 ER PT J AU Wright, SJ AF Wright, Stephen J. TI AN INTERIOR-POINT ALGORITHM FOR LINEARLY CONSTRAINED OPTIMIZATION SO SIAM JOURNAL ON OPTIMIZATION LA English DT Article DE potential reduction algorithm; gradient projection algorithm; linearly constrained optimization AB This paper describes an algorithm for optimization of a smooth function subject to general linear constraints. An algorithm of the gradient projection class is used, with the important feature that the "projection" at each iteration is performed by using a primal-dual interior-point method for convex quadratic programming. Convergence properties can be maintained even if the projection is done inexactly in a well-defined way. Higher-order derivative information on the manifold defined by the apparently active constraints can be used to increase the rate of local convergence. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Wright, SJ (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. FU Applied Mathematical Sciences subprogram of the Office of Energy Research, U.S. Department of Energy [W-31-109-Eng-38] FX This research was partly performed at the University of Queensland, Australia, whose support is gratefully acknowledged. The work was also supported by the Applied Mathematical Sciences subprogram of the Office of Energy Research, U.S. Department of Energy, under contract W-31-109-Eng-38. NR 11 TC 6 Z9 6 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 USA SN 1052-6234 EI 1095-7189 J9 SIAM J OPTIMIZ JI SIAM J. Optim. PD AUG PY 1992 VL 2 IS 3 BP 450 EP 473 DI 10.1137/0802023 PG 24 WC Mathematics, Applied SC Mathematics GA V40SW UT WOS:000209499300007 ER PT J AU NANN, S EMERY, K AF NANN, S EMERY, K TI SPECTRAL EFFECTS ON PV-DEVICE RATING SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article ID TANDEM SOLAR-CELLS; MEYER-NELDEL RULE; SINGLE-JUNCTION; IRRADIANCE; MODEL AB A recently developed spectral model "SEDES2" is applied to study the effect of variations in solar spectral irradiance on the efficiency of seven particular solar cells. As a new feature, SEDES2 calculates hourly solar spectral irradiance for clear and cloudy skies from readily available site-specific meteorological data. Based on these hourly spectra, monthly and yearly efficiencies for the solar cells are derived. As a key result the efficiencies of amorphous silicon cells differ by 10% between winter and summer months because of spectral effects only. A second intention of this study is to analyse the sensitivity of power and energy rating methods to spectral irradiance but also to total irradiance and cell temperature. As an outcome, a multi-value energy rating scheme applying the concept of "critical operation periods" is proposed. C1 NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401. CTR SOLAR ENERGY & HYDROGEN RES,W-7000 STUTTGART 80,GERMANY. NR 55 TC 94 Z9 95 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD AUG PY 1992 VL 27 IS 3 BP 189 EP 216 DI 10.1016/0927-0248(92)90083-2 PG 28 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA JJ135 UT WOS:A1992JJ13500001 ER PT J AU CRESPI, VH COHEN, ML AF CRESPI, VH COHEN, ML TI ANHARMONIC PHONONS AND SUPERCONDUCTIVITY IN PD H(D) SO SOLID STATE COMMUNICATIONS LA English DT Article ID LATTICE-DYNAMICS; PALLADIUM; HYDROGEN; TC AB The inverse isotope effect in PdH(D) is analyzed with a simple model of anharmonic phonons. The model is based on a fit to an ab initio frozen phonon calculation which provides an interionic potential that can reproduce the experimental values for T(c). C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP CRESPI, VH (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. OI Crespi, Vincent/0000-0003-3846-3193 NR 14 TC 5 Z9 5 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD AUG PY 1992 VL 83 IS 6 BP 427 EP 429 DI 10.1016/0038-1098(92)90082-K PG 3 WC Physics, Condensed Matter SC Physics GA JH760 UT WOS:A1992JH76000008 ER PT J AU JOYCE, JJ ARKO, AJ LAWRENCE, JM TANG, J CANFIELD, PC BARTLETT, RJ FISK, Z THOMPSON, JD RISEBOROUGH, PS AF JOYCE, JJ ARKO, AJ LAWRENCE, JM TANG, J CANFIELD, PC BARTLETT, RJ FISK, Z THOMPSON, JD RISEBOROUGH, PS TI CRYSTAL FIELDS, LINEWIDTHS AND TEMPERATURE-DEPENDENCE IN THE PHOTOELECTRON-SPECTRA OF HEAVY FERMION CE AND YB COMPOUNDS SO SOLID STATE COMMUNICATIONS LA English DT Article ID EXCITATIONS AB We report high-resolution photoemission results for the 4f levels in YbCu2Si2 and CeSi2. The data are compared to the predictions of the Anderson impurity model for valence band photoemission. These predicted spectra are obtained both in an approximate fashion by broadening crystal field (CF) states whose parameters are determined from existing neutron scattering data, as well as from a Gunnarson-Schonhammer calculation. Inclusion of crystal fields does not affect our two fundamental conclusions: that there is a natural linewidth in the problem (almost-equal-to 130meV) which is much greater than predicted by the Anderson model, and that the expected temperature dependence of the Kondo resonance is absent. Due to the large natural linewidth, experimental resolution (60-95meV) is not a limiting factor. C1 POLYTECH INST NEW YORK,DEPT PHYS,BROOKLYN,NY 11201. UNIV CALIF IRVINE,DEPT PHYS,IRVINE,CA 92717. RP JOYCE, JJ (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Riseborough, Peter/D-4689-2011; Canfield, Paul/H-2698-2014 NR 12 TC 13 Z9 13 U1 1 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD AUG PY 1992 VL 83 IS 8 BP 551 EP 554 DI 10.1016/0038-1098(92)90649-T PG 4 WC Physics, Condensed Matter SC Physics GA JK752 UT WOS:A1992JK75200004 ER PT J AU AMBERGER, HD HAGEN, C SHALIMOFF, G EDELSTEIN, NM AF AMBERGER, HD HAGEN, C SHALIMOFF, G EDELSTEIN, NM TI ELECTRON-STRUCTURE OF HIGHLY SYMMETRICAL COMPOUNDS OF F-ELEMENTS .23. HOW LARGE ARE THE CRYSTAL-FIELD SPLITTING EFFECTS IN TRIS(BIS(TRIMETHYLSILYL)AMIDO) COMPLEXES OF LANTHANOIDS SO SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY LA German DT Article ID MAGNETIC CIRCULAR-DICHROISM; ORGANOMETALLIC COMPLEXES; ASSIGNMENT; ABSORPTION; SPECTRUM; ADDUCT AB The sigma and pi-absorption spectrum of the H-3(4) --> P-3(0) transition has been measured at room temperature on an oriented single crystal of tris(bis(trimethylsilyl)amido)praseodymium (III) as well as the room temperature magnetic circular dichroism spectrum of the compound dissolved in a mixture of toluene and methylcyclohexane in the ratio 1:1. From these data the crystal field (CF) splitting of the ground H-3(4) manifold was derived. An approximate set of CF parameters was obtained which qualitatively reproduces the experimental levels. The magnitude of the CF parameters demonstrates that the three bis(trimethylsilyl)amido ligands produce an unusually large crystal field. C1 LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. RP AMBERGER, HD (reprint author), UNIV HAMBURG,INST ANORGAN & ANGEW CHEM,MARTIN LUTHER KING PL 6,W-2000 HAMBURG 13,GERMANY. NR 29 TC 9 Z9 9 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0584-8539 J9 SPECTROCHIM ACTA A JI Spectroc. Acta Pt. A-Molec. Biomolec. Spectr. PD AUG PY 1992 VL 48 IS 8 BP 1107 EP 1114 DI 10.1016/0584-8539(92)80120-L PG 8 WC Spectroscopy SC Spectroscopy GA JH569 UT WOS:A1992JH56900006 ER PT J AU GUO, D MAZUMDAR, S DIXIT, SN AF GUO, D MAZUMDAR, S DIXIT, SN TI MICROSCOPIC THEORY OF 3RD-HARMONIC GENERATION AND ELECTROABSORPTION IN CONJUGATED POLYMERS SO SYNTHETIC METALS LA English DT Article ID OPTICAL NONLINEARITY; CUBIC SUSCEPTIBILITY; STATES; POLYDIACETYLENE; BAND AB We develop a physical, intuitive description of optical nonlinearity in conjugated polymers within a completely general microscopic theoretical model. It is shown that third-harmonic generation and electro-absorption give complimentary information on the electronic structures of pi-conjugated systems. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP GUO, D (reprint author), UNIV ARIZONA,DEPT PHYS,TUCSON,AZ 85721, USA. NR 14 TC 19 Z9 19 U1 0 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD AUG 1 PY 1992 VL 49 IS 1-3 BP 1 EP 11 DI 10.1016/0379-6779(92)90068-T PG 11 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA JQ213 UT WOS:A1992JQ21300001 ER PT J AU SEAGER, CH SINCLAIR, M MCBRANCH, D HEEGER, AJ BAKER, GL AF SEAGER, CH SINCLAIR, M MCBRANCH, D HEEGER, AJ BAKER, GL TI PHOTOTHERMAL DEFLECTION SPECTROSCOPY OF CONJUGATED POLYMERS SO SYNTHETIC METALS LA English DT Article ID OPTICAL-ABSORPTION; POLYDIACETYLENE; CRYSTAL; LOSSES; FILMS AB Along with the third-order nonlinear susceptibility, chi(3), the magnitude of the optical absorption in the transparent window below the principal absorption edge is an important para.meter for conjugated polymers used in active integrated optical devices. Photothermal deflection spectroscopy (PDS) is an ideal technique for determining the absorption coefficients of thin films of 'transparent' materials. We have used PDS to measure the optical absorption spectra of the conjugated polymers, poly(1,4-phenylene-vinylene) (and derivatives) and polydiacetylene-4BCMU, in the spectral region from 0.55 to 3 eV. We find that the shape of the absorption edge varies considerably from polymer to polymer, with polydiacetylene-4BCMU having the steepest absorption edge. The minimum absorption coefficients measured varied somewhat with sample age and quality, but were typically in the range 1-10 cm-1. In the region below 1 eV, overtones of C-H stretching modes dominate the absorption behavior. We also observe that irradiation of all of these polymers with light above approximately 2.5 eV produces enhanced absorption below the fundamental edge. In the absence of light, these excitations decay with characteristic times of 10-1000 s and in some cases they may determine the effective IR transparency in the energy range 1.0-1.8 eV. C1 UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106. BELL COMMUN RES INC,RED BANK,NJ. RP SEAGER, CH (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 13 TC 31 Z9 31 U1 3 U2 6 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD AUG 1 PY 1992 VL 49 IS 1-3 BP 91 EP 97 DI 10.1016/0379-6779(92)90077-V PG 7 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA JQ213 UT WOS:A1992JQ21300010 ER PT J AU DONOHOE, RJ ARRINGTON, CA SWANSON, BI AF DONOHOE, RJ ARRINGTON, CA SWANSON, BI TI THERMAL-ACTIVATION OF PHOTOINDUCED DEFECTS IN AN INTERMEDIATE STRENGTH QUASI-ONE-DIMENSIONAL CHARGE-DENSITY WAVE SOLID - PTBR SO SYNTHETIC METALS LA English DT Article ID NONLINEAR LATTICE-RELAXATION; VALENCE METAL-COMPLEXES; LINEAR-CHAIN COMPLEXES; TRANSFER EXCITATION; CRYSTAL-STRUCTURE; POLARONIC STATES; ETHYLENEDIAMINE; PLATINUM; ELECTRON; MODEL AB Photoinduced defects in the intermediate strength charge density wave bromide-bridged platinum linear chain (PtBr) have been examined by resonance Raman and electron paramagnetic resonance spectroscopies. A photogenerated signal is observed by the former technique at 130 cm-1 and by the latter at g = 2.3. However, the observed diminishments in these signal intensities upon warming reveal that the Raman feature is not associated with a paramagnetic site. The loss of the 130 cm-1 peak upon warming and its nearly complete recovery upon recooling suggest the presence of defect inter-conversion, possibly an electron bipolaron/polaron equilibrium, while the behavior of the EPR signal upon warming suggests the presence of a range of pinning potentials that lead to distributed kinetic behavior for activation of the paramagnetic sites. The number of defects is dependent upon the phase in which the PtBr sample were crystallized, with the crystals originating in the higher temperature orthorhombic phase supporting greater levels and varieties of defects than those grown in the monoclinic phase. C1 FURMAN UNIV,DEPT CHEM,GREENVILLE,SC 29613. RP DONOHOE, RJ (reprint author), LOS ALAMOS NATL LAB,INORGAN & STRUCT CHEM GRP,INC-4,MS-C346,LOS ALAMOS,NM 87545, USA. NR 31 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD AUG 1 PY 1992 VL 49 IS 1-3 BP 99 EP 108 DI 10.1016/0379-6779(92)90078-W PG 10 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA JQ213 UT WOS:A1992JQ21300011 ER PT J AU BISHOP, AR BATISTIC, I GAMMEL, JT SAXENA, A AF BISHOP, AR BATISTIC, I GAMMEL, JT SAXENA, A TI OPTICAL-PROPERTIES OF MX CHAIN MATERIALS - AN EXTENDED PEIERLS-HUBBARD MODEL SO SYNTHETIC METALS LA English DT Article ID STATES AB We describe theoretical modeling of both pure (MX) and mixed-halide (MX(x)X(1-x)') halogen (X)-bridged transition metal (M) linear chain complexes in terms of an extended Peierls-Hubbard, tight-binding Hamiltonian with 3/4-filling of two bands. Both inter- and intra-site electron-phonon coupling are included. Electronic (optical absorption), lattice dynamic (IR, Raman) and spin (ESR) signatures are obtained for the ground states, localized excited states produced by impurities, doping or photoexcitation (excitons, polarons, bipolarons, solitons) and the edge states (which occur in mixed-halide crystals, e.g. PtClxBr1-x). Adiabatic molecular dynamics is used to explore photodecay channels in pure and impure systems for ground states as well as in the presence of pre-existing polaronic states: 71.38 + i, 78.30 - j, 71.10 + x. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP BISHOP, AR (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 17 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD AUG 1 PY 1992 VL 49 IS 1-3 BP 109 EP 115 DI 10.1016/0379-6779(92)90079-X PG 7 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA JQ213 UT WOS:A1992JQ21300012 ER PT J AU WANG, XD CAMPBELL, DK AF WANG, XD CAMPBELL, DK TI OPTICAL-ABSORPTION SPECTRA AND POLARONS FOR 3-DIMENSIONAL TRANSPOLYACETYLENE SO SYNTHETIC METALS LA English DT Article ID INTRINSIC DEFECTS; TRANS-(CH)X AB We study the effects of dimensionality in trans-polyacetylene by developing a three-dimensional (3D) generalization of the one-dimensional (ID) Su-Schrieffer-Heeger (SSH) model. Our model faithfully reflects the 3D character of the band-edge states as found in ab initio local-density-approximation (LDA) calculations, but is simple enough to be solvable analytically for the dimerized ground state. We examine the optical absorption predicted within this model, paying special attention to the roles of the transverse coupling and polarized pump and probe fields. We also study the intrinsic bond-order defects (corresponding to 'polarons') in the idealized crystal. RP WANG, XD (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,MS B258,LOS ALAMOS,NM 87545, USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD AUG 1 PY 1992 VL 49 IS 1-3 BP 245 EP 252 DI 10.1016/0379-6779(92)90096-2 PG 8 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA JQ213 UT WOS:A1992JQ21300029 ER PT J AU GRIGORAS, S LIE, GC BARTON, TJ IJADIMAGHSOODI, S PANG, Y SHINAR, J VARDENY, ZV WONG, KS HAN, SG AF GRIGORAS, S LIE, GC BARTON, TJ IJADIMAGHSOODI, S PANG, Y SHINAR, J VARDENY, ZV WONG, KS HAN, SG TI THEORETICAL STRUCTURAL CHARACTERIZATION OF POLYDIETHYNYLSILANE - A NEW NONLINEAR OPTICAL MATERIAL SO SYNTHETIC METALS LA English DT Article ID MOLECULAR-ORBITAL METHODS; VALENCE BASIS-SETS; POLARIZABILITIES; PARAMETERS; ELEMENTS; MNDO AB Recently, a novel pi-conjugated polymer, polydiethynylsilane (PDES), with excellent nonlinear optical properties has been reported. The structures of several isomeric forms for PDES have been characterized theoretically. The results show that the four-membered ring structure is the most plausible and some dialkyl,ethynylsilane groups may insert in the backbone of PDES as sequential copolymers. These results were obtained using the molecular orbital method at the ab initio level (3-21 G* modified) and molecular mechanics method with potentials derived from ab initio calculations. We have also calculated the second-order polarizability. C1 IBM CORP,MIDLAND,MI 48640. UNIV UTAH,DEPT PHYS,SALT LAKE CITY,UT 84112. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,DEPT PHYS,AMES,IA 50011. RP GRIGORAS, S (reprint author), DOW CORNING CORP,C041B1,MIDLAND,MI 48686, USA. NR 16 TC 25 Z9 25 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD AUG 1 PY 1992 VL 49 IS 1-3 BP 293 EP 304 DI 10.1016/0379-6779(92)90102-O PG 12 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA JQ213 UT WOS:A1992JQ21300035 ER PT J AU ROUVIERE, P MANDELCO, L WINKER, S WOESE, CR AF ROUVIERE, P MANDELCO, L WINKER, S WOESE, CR TI A DETAILED PHYLOGENY FOR THE METHANOMICROBIALS SO SYSTEMATIC AND APPLIED MICROBIOLOGY LA English DT Article DE 16S RIBOSOMAL RNA; ARCHAEA; SMALL SUBUNIT RIBOSOMAL-RNA; SIGNATURE ANALYSIS; METHANOGENESIS; EVOLUTION ID RIBOSOMAL-RNA GENE; HIGHER-ORDER STRUCTURE; NUCLEOTIDE-SEQUENCE; ARCHAEBACTERIA; METHANOGENS; NOV; METHANOCORPUSCULUM; CLASSIFICATION AB The small subunit rRNA sequence of twenty archaea, members of the Methanomicrobiales, permits a detailed phylogenetic tree to be inferred for the group. The tree confirms earlier studies, based on far fewer sequences, in showing the group to be divided into two major clusters, temporarily designated the "methanosarcina" group and the "methanogenium" group. The tree also defines phylogenetic relationships within these two groups, which in some cases do not agree with the phylogenetic relationships implied by current taxonomic names - a problem most acute for the genus Methanogenium and its relatives. The present phylogenetic characterization provides the basis for a consistent taxonomic restructuring of this major methanogenic taxon. C1 UNIV ILLINOIS,DEPT MICROBIOL,131 BURRILL HALL,URBANA,IL 61801. ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439. FU NINDS NIH HHS [NSG-7044] NR 30 TC 42 Z9 43 U1 0 U2 2 PU GUSTAV FISCHER VERLAG PI JENA PA VILLENGANG 2, D-07745 JENA, GERMANY SN 0723-2020 J9 SYST APPL MICROBIOL JI Syst. Appl. Microbiol. PD AUG PY 1992 VL 15 IS 3 BP 363 EP 371 PG 9 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA JM924 UT WOS:A1992JM92400007 PM 11540078 ER PT J AU HERZENBERG, CL AF HERZENBERG, CL TI WOMENS SCIENTIFIC LEGACY SO TECHNOLOGY REVIEW LA English DT Letter RP HERZENBERG, CL (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU MASS INST TECHNOL PI CAMBRIDGE PA CAMBRIDGE, MA 02139 SN 0040-1692 J9 TECHNOL REV JI Technol. Rev. PD AUG-SEP PY 1992 VL 95 IS 6 BP 6 EP 6 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JE352 UT WOS:A1992JE35200002 ER PT J AU LAYNE, SP MERGES, MJ DEMBO, M SPOUGE, JL CONLEY, SR MOORE, JP RAINA, JL RENZ, H GELDERBLOM, HR NARA, PL AF LAYNE, SP MERGES, MJ DEMBO, M SPOUGE, JL CONLEY, SR MOORE, JP RAINA, JL RENZ, H GELDERBLOM, HR NARA, PL TI FACTORS UNDERLYING SPONTANEOUS INACTIVATION AND SUSCEPTIBILITY TO NEUTRALIZATION OF HUMAN-IMMUNODEFICIENCY-VIRUS SO VIROLOGY LA English DT Article ID HTLV-III LAV; REVERSE-TRANSCRIPTASE; ENVELOPE GLYCOPROTEIN; OLIGOMERIC STRUCTURE; FINE-STRUCTURE; CELL-ADHESION; SOLUBLE CD4; TYPE-1; HIV-1; INFECTION C1 LOS ALAMOS NATL LAB,DIV THEORET,BIOL & BIOPHYS GRP,LOS ALAMOS,NM 87545. NCI,VIRUS BIOL SECT,TUMOR CELL BIOL LAB,FREDERICK,MD 21701. NATL LIB MED,NATL CTR BIOTECHNOL INFORMAT,BETHESDA,MD 20894. PROGRAM RESOURCES INC,FREDERICK,MD 21701. AARON DIAMOND AIDS RES CTR,NEW YORK,NY 10016. AMER BIOTECHNOL INC,CAMBRIDGE,MA 02139. FED HLTH OFF,ROBERT KOCH INST,W-1000 BERLIN 65,GERMANY. RI Dembo, Micah/C-2755-2013 NR 65 TC 285 Z9 286 U1 1 U2 5 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0042-6822 J9 VIROLOGY JI Virology PD AUG PY 1992 VL 189 IS 2 BP 695 EP 714 DI 10.1016/0042-6822(92)90593-E PG 20 WC Virology SC Virology GA JF684 UT WOS:A1992JF68400030 PM 1386485 ER PT J AU WILK, T MIERSWA, H KRAUSSLICH, HG DUNN, JJ BOSCH, V AF WILK, T MIERSWA, H KRAUSSLICH, HG DUNN, JJ BOSCH, V TI EXPRESSION OF BIOLOGICALLY-ACTIVE HIV GLYCOPROTEINS USING A T7-RNA POLYMERASE-BASED EUKARYOTIC VECTOR SYSTEM SO VIRUS GENES LA English DT Article DE HIV-ENV; HIV-REV; T7-RNA POLYMERASE; EMCV-NTR; COMPLEMENTATION ID BACTERIOPHAGE-T7 RNA-POLYMERASE; 5' NONTRANSLATED REGION; MAMMALIAN-CELLS; MESSENGER-RNA; VACCINIA VIRUS; INTERNAL ENTRY; TARGET GENES; REV PROTEIN; TRANSLATION; STABILITY AB Bacteriophage T7 RNA polymerase and a derivative containing a nuclear localization signal were transiently expressed in CV-1 cells and were shown to localize to the cytoplasm and nucleus, respectively. A vector was constructed containing T7 promoter and transcription terminator sequences flanking a picornaviral 5' untranslated sequence for cap-independent translation and a polyA signal. Expression of the HIV-1 envelope glycoproteins in this vector system gave high levels of specific transcripts and translation products, independent of the subcellular localization of T7 RNA polymerase. The synthesis of HIV glycoproteins was also completely independent of the coexpression of the HIV rev protein, which is normally required for the expression of HIV structural proteins. In addition, a polyA signal was not required, whereas the presence of the picornaviral 5' untranslated region was necessary for efficient expression. Different possibilities to account for these findings are discussed. The HIV glycoproteins synthesized in this system were normally processed and assembled; they could induce syncytium formation and complement an env-deletion mutant of HIV-1. C1 DEUTSCH KREBSFORSCHUNGSZENTRUM,INST VIRUSFORSCH,NEUENHEIMER FELD 280,W-6900 HEIDELBERG,GERMANY. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. NR 28 TC 8 Z9 8 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0920-8569 J9 VIRUS GENES JI Virus Genes PD AUG PY 1992 VL 6 IS 3 BP 229 EP 246 DI 10.1007/BF01702562 PG 18 WC Genetics & Heredity; Virology SC Genetics & Heredity; Virology GA JJ763 UT WOS:A1992JJ76300003 PM 1413540 ER PT J AU EDMONDS, J AF EDMONDS, J TI WHY UNDERSTANDING THE NATURAL SINKS AND SOURCES OF CO2 IS IMPORTANT - A POLICY ANALYSIS PERSPECTIVE SO WATER AIR AND SOIL POLLUTION LA English DT Article ID GLOBAL CARBON-CYCLE; BIOSPHERE AB The mechanisms that regulate the concentration of carbon dioxide in the atmosphere, the carbon cycle, is an integral part of the analysis of the greenhouse issue. The present understanding of the carbon cycle is inadequate to the purpose of assessing the relationship between future anthropogenic emissions and concentrations of atmospheric CO2. The most important problem is that natural science cannot presently explain the relationship between present and past anthropogenetic emissions and concentrations. Sinks for CO2 are inadequate to explain present and past dispositions of emissions. This deficiency in scientific understanding leads to uncertainty in the analysis of potential future emissions and atmospheric CO2 accumulation, and to uncertainty in the specification of other policy analysis instruments such as global warming potential coefficients. RP EDMONDS, J (reprint author), PACIFIC NW LAB, 901 D ST SW,SUITE 900, WASHINGTON, DC 20024 USA. NR 29 TC 7 Z9 8 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD AUG PY 1992 VL 64 IS 1-2 BP 11 EP 21 DI 10.1007/BF00477093 PG 11 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA JA715 UT WOS:A1992JA71500004 ER PT J AU MARLAND, G MARLAND, S AF MARLAND, G MARLAND, S TI SHOULD WE STORE CARBON IN TREES SO WATER AIR AND SOIL POLLUTION LA English DT Article AB In order to explore for the most effective strategy for using forests to mitigate global climate change, we have constructed a simple model of C uptake during forest growth and the fate of this C when forests are harvested and used as fuel to replace fossil fuels. We suggest that trees are equally effective in preventing the accumulation of CO2 in the atmosphere if they remove a unit of C from the atmosphere or if they supply a sustainable source of energy that substitutes for a unit of C discharged by burning fossil fuels. The model shows that the most effective strategy for using forest land to minimize increases in atmospheric CO2 will depend on the current status of the land, the productivity that can be expected, the efficiency with which the forest harvest is used to substitute for fossil fuels, and thc time perspective of the analysis. For forests with large standing biomass and low productivity the most effective strategy is to protect the existing forest. For land with little standing biomass and low productivity, the most effective strategy is to reforest or otherwise manage the land for forest growth and C storage. Where high productivity can bc expected, thc most effective strategy is to manage the forest for a harvestable crop and to use the harvest with maximum efficiency either for long-lived products or to substitute for fossil fuels. The longer the time perspective, the more likely that harvesting and replanting will result in net C benefits. RP MARLAND, G (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. NR 10 TC 82 Z9 84 U1 1 U2 10 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD AUG PY 1992 VL 64 IS 1-2 BP 181 EP 195 DI 10.1007/BF00477101 PG 15 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA JA715 UT WOS:A1992JA71500012 ER PT J AU POST, WM PASTOR, J KING, AW EMANUEL, WR AF POST, WM PASTOR, J KING, AW EMANUEL, WR TI ASPECTS OF THE INTERACTION BETWEEN VEGETATION AND SOIL UNDER GLOBAL CHANGE SO WATER AIR AND SOIL POLLUTION LA English DT Article ID ATMOSPHERIC CARBON-DIOXIDE; CO2-INDUCED CLIMATE CHANGE; NITROGEN MINERALIZATION; TERRESTRIAL ECOSYSTEMS; LITTER DECOMPOSITION; MOUNTAIN HEMLOCK; NORTH-AMERICA; CO2; NUTRIENT; FORESTS AB Responses of terrestrial ecosystems to a world undergoing a change in atmospheric CO2 concentration presents a formidable challenge to terrestrial ecosystem scientists. Strong relationships among climate, atmosphere, soils and biota at many different temporal and spatial scales make the understanding and prediction of changes in net ecosystem production (NEP) at a global scale difficult. Global C cycle models have implicitly attempted to account for some of this complexity by adapting lower pool sizes and smaller flux rates representing large regions and long temporal averages than values appropriate for a small area. However, it is becoming increasingly evident that terrestrial ecosystems may be experiencing a strong transient forcing as a result of increasing levels of atmospheric CO2 that will require a finer temporal and spatial representation of terrestrial systems than the parameters for current global C cycle models allow. To adequately represent terrestrial systems. in the global C cycle it is necessary to explicitly model the response of terrestrial systems to primary environmental factors. While considerable progress has been. made experimentally and conceptually in aspects of photosynthetic responses, and gross and net primary production, the application of this understanding to NEP at individual sites is not well developed. This is an essential step in determining effects of plant physiological responses on the global C cycle. We use a forest stand succession model to explore the effects of several possible plant responses to elevated atmospheric CO2 concentration. These simulations show that ecosystem C storage can be increased by increases in individual tree growth rate, reduced transpiration, of increases in fine root production commensurate with experimental observations. RP POST, WM (reprint author), OAK RIDGE NATL LAB,POB 2008,BLDG 1000,OAK RIDGE,TN 37831, USA. RI Post, Wilfred/B-8959-2012; Pastor, John/F-6241-2011 NR 68 TC 26 Z9 27 U1 0 U2 6 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD AUG PY 1992 VL 64 IS 1-2 BP 345 EP 363 DI 10.1007/BF00477110 PG 19 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA JA715 UT WOS:A1992JA71500021 ER PT J AU DOWNING, JP CATALDO, DA AF DOWNING, JP CATALDO, DA TI NATURAL SINKS OF CO2 - TECHNICAL SYNTHESIS FROM THE PALMAS-DEL-MAR WORKSHOP SO WATER AIR AND SOIL POLLUTION LA English DT Article ID OCEAN; MODEL AB Natural CO2 sinks in terrestrial and marine environments are important components of the global carbon cycle, yet the sign and magnitudes of key fluxes among them are unknown. The results of the Palmas Del Mar Workshop - Natural Sinks of CO2 presented in this special issue and its companion hard-bound volume of Water, Air, & Soil Pollution, provide a synthesis of current research on the carbon cycle, CO2 sinks and associated processes and fluxes, and critical research needs to assess the potential role of forest and land-use management in carbon sequestration. The papers in this volume present data, observations, and model simulations that demonstrate: 1) the existence of natural CO2 sinks that could mitigate a significant amount of CO2 emissions from fossil-fuel combustion; 2) probable, human-caused imbalances in C exchanges among vegetation, soils, and the atmosphere; 3) enhanced C storage in vegetation in response to excess atmospheric CO2; 4) strong interactions among carbon, nutrient and hydrological cycles; and 5) an excess of carbon production over consumption in several, large managed forests. Although it appears unlikely that the search for the "missing" C sink required to balance the C budget will end in the open ocean, new estimates of C storage in mangrove wood and peat, suggest that coastal ecosystems have the capacity to store significant amounts of carbon in vegetation and sediments. Convincing analyses are also presented indicating the technical and economical feasibility of managing existing lands to sequester additional carbon. Long-term field studies of CO2 fertilization effects and carbon cycling by plants and soils in geographically important systems, native forests, and coastal ecosystems will go a long way toward meeting the research needs identified at the workshop. C1 PACIFIC NW LABS, DEPT ENVIRONM SCI, RICHLAND, WA 99352 USA. RP DOWNING, JP (reprint author), PACIFIC NW LAB, MARINE SCI LAB, 439 W SEQUIM BAY RD, SEQUIM, WA 98382 USA. NR 47 TC 1 Z9 1 U1 2 U2 9 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD AUG PY 1992 VL 64 IS 1-2 BP 439 EP 453 DI 10.1007/BF00477115 PG 15 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA JA715 UT WOS:A1992JA71500026 ER PT J AU KABADIYSKI, MK CRISTANCHO, F GROSS, CJ JUNGCLAUS, A LIEB, KP RUDOLPH, D GRAWE, H HEESE, J MAIER, KH EBERTH, J SKODA, S CHOU, WT WARBURTON, EK AF KABADIYSKI, MK CRISTANCHO, F GROSS, CJ JUNGCLAUS, A LIEB, KP RUDOLPH, D GRAWE, H HEESE, J MAIER, KH EBERTH, J SKODA, S CHOU, WT WARBURTON, EK TI A STUDY OF HIGH-SPIN STATES IN THE TRANSITIONAL NUCLEUS MO-95 SO ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI LA English DT Article ID SHELL-MODEL; LEVEL STRUCTURE; N=49 ISOTONES; SPECTROSCOPY; COEXISTENCE; ZR-83 AB The reaction Ni-58(Ar-36, 4p)Mo-95 has been studied at a beam energy of 149 MeV A detector array consisting of the OSIRIS spectrometer (12 Compton-suppressed Ge detectors), four charged-particle DELTA-E detectors and seven NE-213 neutron detectors at the VICKSI accelerator in Berlin has been used to measure the gamma radiation in gamma-gamma- and particle-gamma-gamma-coincidence mode. An additional Ge detector was placed at 162-degrees to the beam direction to provide information on DCO ratios. The level scheme of "Mo has been extended up to an excitation energy of about 12 MeV and probable spin 23HBAR. Some 70 transitions and 40 levels have been newly identified. Spin assignments have been proposed on the basis of measured DCO ratios. Shell model calculations in a model space consisting of the proton 1f5/2, 2p3/2, 2p1/2, and 1g9/2 orbits and the neutron 2p1/2, 1g9/2, 1g7/2, 2 d5/2, 2d3/2, and 3s1/2 orbits with some truncation were made for states above 9HBAR and the predicted structure of these states is discussed. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV COLOGNE,INST KERNPHYS,W-5000 COLOGNE 41,GERMANY. CLARK UNIV,WORCESTER,MA 01610. HAHN MEITNER INST KERNFORSCH BERLIN GMBH,W-1000 BERLIN 39,GERMANY. RP KABADIYSKI, MK (reprint author), UNIV GOTTINGEN,INST PHYS 2,BUNSENSTR 7-9,W-3400 GOTTINGEN,GERMANY. RI Rudolph, Dirk/D-4259-2009 OI Rudolph, Dirk/0000-0003-1199-3055 NR 51 TC 40 Z9 40 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0939-7922 J9 Z PHYS A-HADRON NUCL JI Z. Phys. A.-Hadrons Nuclei PD AUG PY 1992 VL 343 IS 2 BP 165 EP 177 DI 10.1007/BF01291821 PG 13 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA JH190 UT WOS:A1992JH19000006 ER PT J AU BUSKULIC, D DECAMP, D GOY, C LEES, JP MINARD, MN MOURS, B ALEMANY, R ARIZTIZABAL, F COMAS, P CRESPO, JM DELFINO, M FERNANDEZ, E GAITAN, V GARRIDO, L MIR, LM PACHECO, A PASCUAL, A CREANZA, D DEPLAMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G GAO, Y HU, H HUANG, D HUANG, X LOU, J QIAO, C WANG, T XIE, Y XU, D XU, R ZHANG, J LIN, J ZHAO, W ATWOOD, WB BAUERDICK, LAT BLUCHER, E BONVICINI, G BOSSI, F BOUDREAU, J BURNETT, TH DREVERMANN, H FORTY, RW HAGELBERG, R HARVEY, J HAYWOOD, S HILGART, J JACOBSEN, R JOST, B KNOBLOCH, J LANCON, E LEHRAUS, I LOHSE, T LUSIANI, A MARTINEZ, M MATO, P MATTISON, T MEINHARD, H MENARY, S MEYER, T MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG NASH, J PALAZZI, P PERLAS, JA RANJARD, G REDLINGER, G ROLANDI, L ROTH, A ROTHBERG, J RUAN, T SAICH, M SCHLATTER, D SCHMELLING, M SEFKOW, F TEJESSY, W WACHSMUTH, H WIEDENMANN, W WILDISH, T WITZELING, W WOTSCHAK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M BENCHEIKH, AM ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PIETRZYK, B PRORIOL, J PREULHIERE, F STIMPFL, G FEARNLEY, T HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I KYRIAKIS, A SIMOPOULOU, E VAYAKI, A ZACHARIADOU, K BADIER, J BLONDEL, A BONNEAUD, G BRIENT, JC FOUQUE, G GAMESS, A ORTEU, S ROSOWSKY, A ROUGE, A RUMPF, M TANAKA, R VIDEAU, H CANDLIN, DJ PARSONS, MI VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L WASSERBAECH, S ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P ALTOON, B BOYLE, O COLRAIN, P TENHAVE, I LYNCH, JG MAITLAND, W MORTON, WT RAINE, C SCARR, JM SMITH, K THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEIGES, R GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M COLLING, DJ DORNAN, PJ DUGEAY, S GREENE, AM HASSARD, JF LIESKE, NM PATTON, SJ PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TOMALIN, IR WRIGHT, AG KNERINGER, E KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G JACKSON, D KEEMER, NR NUTTALL, M PATEL, A SLOAN, T SNOW, SW WHELAN, EP BARCZEWSKI, T KLEINKNECHT, K RAAB, J RENK, B ROEHN, S SANDER, HG SCHMIDT, H STEEG, F WALTHER, SM WOLF, B AUBERT, JJ BENCHOUK, C BERNARD, V BONISSENT, A CARR, J COYLE, P DRINKARD, J ETIENNE, F PAPALEXIOU, S PAYRE, P QIAN, Z ROUSSEAU, D SCHWEMLING, P TALBY, M ADLUNG, S BECKER, H BLUM, W BROWN, D CATTANEO, P COWAN, G DEHNING, B DIETL, H DYDAK, F FERNANDEZBOSMAN, M FRANK, M HALLEY, AW HANSLKOZANECKA, T LAUBER, J LUTJENS, G LUTZ, G MANNER, W PAN, Y RICHTER, R ROTSCHEIDT, H SCHRODER, J SCHWARZ, AS SETTLES, R STIERLIN, U STIEGLER, U STDENIS, R TAKASHIMA, M THOMAS, J WOLF, G BERTIN, V BOUCROT, J CALLOT, O CHEN, X CORDIER, A DAVIER, M GRIVAZ, JF HEUSSE, P JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM SCHUNE, MH VEILLET, JJ VIDEAU, I ZHANG, Z ZOMER, F ABBANEO, D AMENDOLIA, SR BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BRADASCHIA, C CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GIASSI, A GIORGI, MA LIGABUE, F MANNELLI, EB MARROCCHESI, PS MESSINEO, A PALLA, F RIZZO, G SANGUINETTI, G STEINBERGER, J TECHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J CARTER, JM GREEN, MG MARCH, PV MEDCALF, T QUAZI, IS STRONG, JA WEST, LR BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P KOZANECKI, W LEMAIRE, MC LOCCI, E LOUCATOS, S MONNIER, E PEREZ, P PERRIER, F RANDER, J RENARDY, JF ROUSSARIE, A SCHULLER, JP SCHWINDLING, J MOHAND, DS VALLAGE, B JOHNSON, RP LITKE, AM TAYLOR, G WEAR, J ASHMAN, JG BABBAGE, W BOOTH, CN BUTTAR, C CARNEY, RE CARTWRIGHT, S COMBLEY, F HATFIELD, F REEVES, P THOMPSON, LF BARBERIO, E BRANDT, S GRUPEN, C MIRABITO, L SCHAFER, U SEYWERD, H GANIS, G GIANNINI, G GOBBO, B RAGUSA, F BELLANTONI, L CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JARED, RC LECLAIRE, BW LISHKA, C PAN, YB PATER, JR SAADI, Y SHARMA, V SCHMITT, M SHI, ZH TANG, YH WALSH, AM WEBER, FV WHITNEY, MH WU, SL WU, X ZOBERNIG, G AF BUSKULIC, D DECAMP, D GOY, C LEES, JP MINARD, MN MOURS, B ALEMANY, R ARIZTIZABAL, F COMAS, P CRESPO, JM DELFINO, M FERNANDEZ, E GAITAN, V GARRIDO, L MIR, LM PACHECO, A PASCUAL, A CREANZA, D DEPLAMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G GAO, Y HU, H HUANG, D HUANG, X LOU, J QIAO, C WANG, T XIE, Y XU, D XU, R ZHANG, J LIN, J ZHAO, W ATWOOD, WB BAUERDICK, LAT BLUCHER, E BONVICINI, G BOSSI, F BOUDREAU, J BURNETT, TH DREVERMANN, H FORTY, RW HAGELBERG, R HARVEY, J HAYWOOD, S HILGART, J JACOBSEN, R JOST, B KNOBLOCH, J LANCON, E LEHRAUS, I LOHSE, T LUSIANI, A MARTINEZ, M MATO, P MATTISON, T MEINHARD, H MENARY, S MEYER, T MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG NASH, J PALAZZI, P PERLAS, JA RANJARD, G REDLINGER, G ROLANDI, L ROTH, A ROTHBERG, J RUAN, T SAICH, M SCHLATTER, D SCHMELLING, M SEFKOW, F TEJESSY, W WACHSMUTH, H WIEDENMANN, W WILDISH, T WITZELING, W WOTSCHAK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M BENCHEIKH, AM ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PIETRZYK, B PRORIOL, J PREULHIERE, F STIMPFL, G FEARNLEY, T HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I KYRIAKIS, A SIMOPOULOU, E VAYAKI, A ZACHARIADOU, K BADIER, J BLONDEL, A BONNEAUD, G BRIENT, JC FOUQUE, G GAMESS, A ORTEU, S ROSOWSKY, A ROUGE, A RUMPF, M TANAKA, R VIDEAU, H CANDLIN, DJ PARSONS, MI VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L WASSERBAECH, S ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P ALTOON, B BOYLE, O COLRAIN, P TENHAVE, I LYNCH, JG MAITLAND, W MORTON, WT RAINE, C SCARR, JM SMITH, K THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEIGES, R GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M COLLING, DJ DORNAN, PJ DUGEAY, S GREENE, AM HASSARD, JF LIESKE, NM PATTON, SJ PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TOMALIN, IR WRIGHT, AG KNERINGER, E KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G JACKSON, D KEEMER, NR NUTTALL, M PATEL, A SLOAN, T SNOW, SW WHELAN, EP BARCZEWSKI, T KLEINKNECHT, K RAAB, J RENK, B ROEHN, S SANDER, HG SCHMIDT, H STEEG, F WALTHER, SM WOLF, B AUBERT, JJ BENCHOUK, C BERNARD, V BONISSENT, A CARR, J COYLE, P DRINKARD, J ETIENNE, F PAPALEXIOU, S PAYRE, P QIAN, Z ROUSSEAU, D SCHWEMLING, P TALBY, M ADLUNG, S BECKER, H BLUM, W BROWN, D CATTANEO, P COWAN, G DEHNING, B DIETL, H DYDAK, F FERNANDEZBOSMAN, M FRANK, M HALLEY, AW HANSLKOZANECKA, T LAUBER, J LUTJENS, G LUTZ, G MANNER, W PAN, Y RICHTER, R ROTSCHEIDT, H SCHRODER, J SCHWARZ, AS SETTLES, R STIERLIN, U STIEGLER, U STDENIS, R TAKASHIMA, M THOMAS, J WOLF, G BERTIN, V BOUCROT, J CALLOT, O CHEN, X CORDIER, A DAVIER, M GRIVAZ, JF HEUSSE, P JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM SCHUNE, MH VEILLET, JJ VIDEAU, I ZHANG, Z ZOMER, F ABBANEO, D AMENDOLIA, SR BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BRADASCHIA, C CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GIASSI, A GIORGI, MA LIGABUE, F MANNELLI, EB MARROCCHESI, PS MESSINEO, A PALLA, F RIZZO, G SANGUINETTI, G STEINBERGER, J TECHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J CARTER, JM GREEN, MG MARCH, PV MEDCALF, T QUAZI, IS STRONG, JA WEST, LR BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P KOZANECKI, W LEMAIRE, MC LOCCI, E LOUCATOS, S MONNIER, E PEREZ, P PERRIER, F RANDER, J RENARDY, JF ROUSSARIE, A SCHULLER, JP SCHWINDLING, J MOHAND, DS VALLAGE, B JOHNSON, RP LITKE, AM TAYLOR, G WEAR, J ASHMAN, JG BABBAGE, W BOOTH, CN BUTTAR, C CARNEY, RE CARTWRIGHT, S COMBLEY, F HATFIELD, F REEVES, P THOMPSON, LF BARBERIO, E BRANDT, S GRUPEN, C MIRABITO, L SCHAFER, U SEYWERD, H GANIS, G GIANNINI, G GOBBO, B RAGUSA, F BELLANTONI, L CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JARED, RC LECLAIRE, BW LISHKA, C PAN, YB PATER, JR SAADI, Y SHARMA, V SCHMITT, M SHI, ZH TANG, YH WALSH, AM WEBER, FV WHITNEY, MH WU, SL WU, X ZOBERNIG, G TI PROPERTIES OF HADRONIC Z-DECAYS AND TEST OF QCD GENERATORS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID JET PRODUCTION-RATES; LUND MONTE-CARLO; QUARK FRAGMENTATION FUNCTIONS; ENERGY-ENERGY CORRELATIONS; STRONG COUPLING STRENGTH; E+E ANNIHILATION; ALPHA-S; CHARGED-PARTICLE; PERTURBATIVE QCD; PETRA ENERGIES AB Distributions are presented of event shape variables, jet roduction rates and charged particle momenta obtained from 53 000 hadronic Z decays. They are compared to the predictions of the QCD + hadronization models JETSET, ARIADNE and HERWIG, and are used to optimize several model parameters. The JETSET and ARIADNE coherent parton shower (PS) models with running alpha(s) and string fragmentation yield the best description of the data. The HERWIG parton shower model with cluster fragmentation fits the data less well. The data are in better agreement with JETSET PS than with JETSET O(alpha(s)2) matrix elements (ME) even when the renormalization scale is optimized. C1 IST NAZL FIS NUCL,SEZIONE BARI,I-70126 BARI,ITALY. UNIV BARI,DIPARTIMENTO FIS,I-70126 BARI,ITALY. CHINESE ACAD SCI,INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA. CERN,DIV PPE,CH-1211 GENEVA 23,SWITZERLAND. SLAC,STANFORD,CA 94309. UNIV WASHINGTON,SEATTLE,WA 98195. UNIV TURIN,IST FIS GEN,I-10124 TURIN,ITALY. CNR,IST COSMOGEOFIS,TURIN,ITALY. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. NAPLES UNIV,DIPARTIMENTO SCI FIS,I-80138 NAPLES,ITALY. CERN,EUROPEAN LAB PARTICLE PHYS,CH-1211 GENEVA 23,SWITZERLAND. UNIV CLERMONT FERRAND,INST NATL PHYS NUCL & PHYS PARTICULES,PHYS CORPUSCULAIRE LAB,F-63177 CLERMONT FERRAND,FRANCE. NIELS BOHR INST,DK-2100 COPENHAGEN,DENMARK. DEMOCRITOS NUCL RES CTR,ATHENS,GREECE. ECOLE POLYTECH,INST NATL PHYS NUCL & PHYS PARTICULES,F-91128 PALAISEAU,FRANCE. UNIV EDINBURGH,DEPT PHYS,EDINBURGH EH8 9JZ,MIDLOTHIAN,SCOTLAND. UNIV FLORENCE,IST NAZL FIS NUCL,DIPARTIMENTO FIS,SEZIONE FIRENZE,I-50125 FLORENCE,ITALY. FLORIDA STATE UNIV,SUPERCOMP COMPUTAT RES INST,TALLAHASSEE,FL 32306. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306. UNIV GLASGOW,DEPT PHYS & ASTRON,GLASGOW G12 8QQ,SCOTLAND. UNIV HEIDELBERG,INST HOCHENERGIEPHYS,W-6900 HEIDELBERG,GERMANY. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,DEPT PHYS,LONDON SW7 2AZ,ENGLAND. UNIV INNSBRUCK,INST EXPTL PHYS,A-6020 INNSBRUCK,AUSTRIA. UNIV LANCASTER,DEPT PHYS,LANCASTER LA1 4YB,ENGLAND. UNIV MAINZ,INST PHYS,W-6500 MAINZ,GERMANY. FAC SCI LUMINY,INST NAZL PHYS NUCL & PHYS PARTICULES,CTR PHYS PARTICULES,F-13288 MARSEILLE,FRANCE. MAX PLANCK INST PHYS & ASTROPHYS,WERNER HEISENBERG INST PHYS,W-8000 MUNICH 40,GERMANY. UNIV PARIS 11,INST NATL PHYS NUCL & PHYS PARTICULES,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE. UNIV PISA,IST NAZL FIS NUCL,DIPARTIMENTO FIS,SEZIONE PISA,I-56010 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56010 PISA,ITALY. UNIV LONDON,ROYAL HOLLOWAY & BEDFORD NEW COLL,DEPT PHYS,SURREY TW20 OEX,ENGLAND. RUTHERFORD APPLETON LAB,DEPT PARTICLE PHYS,DIDCOT OX11 0QX,OXON,ENGLAND. CENS,DAPNIA,SERV PHYS PARTICLES,F-91191 GIF SUR YVETTE,FRANCE. UNIV CALIF SANTA CRUZ,INST PARTICLE PHYS,SANTA CRUZ,CA 95064. UNIV SHEFFIELD,DEPT PHYS,SHEFFIELD S3 7RH,S YORKSHIRE,ENGLAND. UNIV SIEGEN,FACHBEREICH PHYS,W-5900 SIEGEN,GERMANY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,SEZIONE TRIESTE,I-34127 TRIESTE,ITALY. UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. UNIV AUTONOMA BARCELONA,INST FIS ALTES ENERGIES,E-08193 BARCELONA,SPAIN. RP BUSKULIC, D (reprint author), INST NATL PHYS NUCL & PHYS PARTICULES,PHYS PARTICULES LAB,CNRS,F-74019 ANNECY LE VIEUX,FRANCE. RI Delfino, Manuel/A-1545-2012; ANTONELLI, ANTONELLA/C-6238-2011; Buttar, Craig/D-3706-2011; Stahl, Achim/E-8846-2011; Passalacqua, Luca/F-5127-2011; St.Denis, Richard/C-8997-2012; Forti, Francesco/H-3035-2011; Focardi, Ettore/E-7376-2012; Venturi, Andrea/J-1877-2012; Perrier, Frederic/A-5953-2011; Rolandi, Luigi (Gigi)/E-8563-2013; Colas, Paul/F-2876-2013; Bosman, Martine/J-9917-2014; Fernandez, Enrique/L-5387-2014; Mir, Lluisa-Maria/G-7212-2015; ciocci, maria agnese /I-2153-2015; Hansen, John/B-9058-2015; Lusiani, Alberto/N-2976-2015; Marrocchesi, Pier Simone/N-9068-2015; Lusiani, Alberto/A-3329-2016; Murtas, Fabrizio/B-5729-2012; Booth, Christopher/B-5263-2016; Pacheco Pages, Andres/C-5353-2011; Ferrante, Isidoro/F-1017-2012; Ligabue, Franco/F-3432-2014; Rizzo, Giuliana/A-8516-2015; OI Delfino, Manuel/0000-0002-9468-4751; Stahl, Achim/0000-0002-8369-7506; Forti, Francesco/0000-0001-6535-7965; Focardi, Ettore/0000-0002-3763-5267; Rolandi, Luigi (Gigi)/0000-0002-0635-274X; Bosman, Martine/0000-0002-7290-643X; Fernandez, Enrique/0000-0002-6405-9488; Mir, Lluisa-Maria/0000-0002-4276-715X; ciocci, maria agnese /0000-0003-0002-5462; Hansen, John/0000-0002-8422-5543; Lusiani, Alberto/0000-0002-6876-3288; Marrocchesi, Pier Simone/0000-0003-1966-140X; Lusiani, Alberto/0000-0002-6876-3288; Booth, Christopher/0000-0002-6051-2847; Pacheco Pages, Andres/0000-0001-8210-1734; Ferrante, Isidoro/0000-0002-0083-7228; Palazzi, Paolo/0000-0002-4861-391X; RASO, Giuseppe/0000-0002-5660-3711; Bottigli, Ubaldo/0000-0002-0666-3433; Ligabue, Franco/0000-0002-1549-7107; Bloch-Devaux, Brigitte/0000-0002-2463-1232; Rizzo, Giuliana/0000-0003-1788-2866; Murtas, Fabrizio/0000-0002-7041-6541; Garrido Beltran, Lluis/0000-0001-8883-6539; Edgecock, Rob/0000-0002-7896-3312; Miquel, Ramon/0000-0002-6610-4836 NR 54 TC 92 Z9 92 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD AUG PY 1992 VL 55 IS 2 BP 209 EP 234 PG 26 WC Physics, Particles & Fields SC Physics GA JJ682 UT WOS:A1992JJ68200003 ER PT J AU ADAMOVICH, MI AGGARWAL, MM ALEXANDROV, YA ANDREEVA, NP ANSON, ZV ARORA, R AVETYAN, FA BADYAL, SK BASOVA, E BHALLA, KB BHASIN, A BHATIA, VS BOGDANOV, VG BUBNOV, VI BURNETT, TH CAI, X CHASNIKOV, IY CHERNOVA, LP CHERNYAVSKI, MM ELIGBAEVA, GZ EREMENKO, LE GAITINOV, AS GANSSAUGE, ER GARPMAN, S GERASSIMOV, SG GROTE, J GULAMOV, KG GUPTA, SK HECKMAN, HH JAKOBSSON, B JUDEK, B KACHROO, S KADYROV, FG KALYACHKINA, GS KANYGINA, EK KARABOVA, M KAUL, GL KHARLAMOV, SP KOSS, T KRASNOV, SA KUMAR, V LAL, P LARIONOVA, VG LEPETAN, VN LIU, LS LIU, YZ LOKANATHAN, S LORD, J LUKICHEVA, NS LUO, SB MANGOTRA, LK MARUTYAN, NA MASLENNIKOVA, NV MITTRA, IS MOOKERJEE, S NASRULAEVA, H NASYROV, SH NAVOTNY, VS ORLOVA, GI OTTERLUND, I PALSANIA, HS PERESADKO, NG PETROV, NV PLYUSHCHEV, VA QIAN, WY RANIWALA, R RANIWALA, S RAO, NK RAPPOPORT, VM RAVINA, J RHEE, JT SAIDKHANOV, N SALMANOVA, NA SARKISOVA, LG SARKISYAN, VR SHABRATOVA, GS SHAKHOVA, TI SKELDING, D SODERSTROM, K SOLOVJEVA, ZI STENLUND, E STRAUSZ, SC SVECHNIKOVA, LN TOLSTOV, KD TRETYAKOVA, MI TROFIMOVA, TP TULEEVA, U VOKAL, S WANG, HQ WENG, ZQ WILKES, RJ XU, GF ZHANG, DH ZHENG, PY ZHOCHOVA, SI ZHOU, DC AF ADAMOVICH, MI AGGARWAL, MM ALEXANDROV, YA ANDREEVA, NP ANSON, ZV ARORA, R AVETYAN, FA BADYAL, SK BASOVA, E BHALLA, KB BHASIN, A BHATIA, VS BOGDANOV, VG BUBNOV, VI BURNETT, TH CAI, X CHASNIKOV, IY CHERNOVA, LP CHERNYAVSKI, MM ELIGBAEVA, GZ EREMENKO, LE GAITINOV, AS GANSSAUGE, ER GARPMAN, S GERASSIMOV, SG GROTE, J GULAMOV, KG GUPTA, SK HECKMAN, HH JAKOBSSON, B JUDEK, B KACHROO, S KADYROV, FG KALYACHKINA, GS KANYGINA, EK KARABOVA, M KAUL, GL KHARLAMOV, SP KOSS, T KRASNOV, SA KUMAR, V LAL, P LARIONOVA, VG LEPETAN, VN LIU, LS LIU, YZ LOKANATHAN, S LORD, J LUKICHEVA, NS LUO, SB MANGOTRA, LK MARUTYAN, NA MASLENNIKOVA, NV MITTRA, IS MOOKERJEE, S NASRULAEVA, H NASYROV, SH NAVOTNY, VS ORLOVA, GI OTTERLUND, I PALSANIA, HS PERESADKO, NG PETROV, NV PLYUSHCHEV, VA QIAN, WY RANIWALA, R RANIWALA, S RAO, NK RAPPOPORT, VM RAVINA, J RHEE, JT SAIDKHANOV, N SALMANOVA, NA SARKISOVA, LG SARKISYAN, VR SHABRATOVA, GS SHAKHOVA, TI SKELDING, D SODERSTROM, K SOLOVJEVA, ZI STENLUND, E STRAUSZ, SC SVECHNIKOVA, LN TOLSTOV, KD TRETYAKOVA, MI TROFIMOVA, TP TULEEVA, U VOKAL, S WANG, HQ WENG, ZQ WILKES, RJ XU, GF ZHANG, DH ZHENG, PY ZHOCHOVA, SI ZHOU, DC TI A SYSTEMATIC STUDY OF THE ENERGY INDEPENDENT BEHAVIOR OF THE FRAGMENTATION REGIONS IN O-16-EM INTERACTIONS FROM 3.7 TO 200 A GEV SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID INDUCED EMULSION INTERACTIONS; RAPIDITY DISTRIBUTIONS; INTERMITTENCY; FLUCTUATIONS; COLLISIONS AB The scaling behaviour in the fragmentation regions is investigated for O-16-Em interactions from 3.7 to 200 A GeV. It is found that in both the projectile- and the target-fragmentation regions, the multiplicity and pseudo-rapidity distributions as well as the two-particle pseudo-rapidity correlations are independent of incident energy. The intermittency indices at 14.6, 60 and 200 A GeV are the same within the experimental errors, indicating that the limiting fragmentation hypothesis works with regard to dynamical as well as statistical fluctuations. C1 CHINESE ACAD SCI,BEIJING,PEOPLES R CHINA. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. PANJAB UNIV,CHANDIGARH 160014,INDIA. HUNAN EDUC INST,CHANGSHA,PEOPLES R CHINA. DUBNA JOINT NUCL RES INST,DUBNA,USSR. UNIV RAJASTHAN,JAIPUR 302004,RAJASTHAN,INDIA. UNIV JAMMU,JAMMU 180001,INDIA. VG KHLOPIN RADIUM INST,LENINGRAD 197022,USSR. SHANXI NORMAL UNIV,LINFEN,PEOPLES R CHINA. UNIV LUND,S-22101 LUND,SWEDEN. UNIV MARBURG,W-3550 MARBURG,GERMANY. PN LEBEDEV INST,MOSCOW,USSR. NATL RES COUNCIL CANADA,OTTAWA K1A 0R6,ONTARIO,CANADA. UNIV WASHINGTON,SEATTLE,WA 98195. NUCL PHYS INST,TASHKENT,UZBEKISTAN,USSR. PHYS TECH INST,TASHKENT,UZBEKISTAN,USSR. HUA ZHONG NORMAL UNIV,WUHAN,PEOPLES R CHINA. PHYS INST,YEREVAN,ARMENIA,USSR. RP ADAMOVICH, MI (reprint author), HIGH ENERGY PHYS INST,ALMA ATA,KAZAKHSTAN,USSR. RI Wilkes, R.Jeffrey/E-6011-2013; Gerassimov, Sergei/M-8779-2015; Kharlamov, Sergei/M-9612-2015; Peresadko, Natalia/M-9585-2015; OI Bhasin, Anju/0000-0002-3687-8179 NR 15 TC 3 Z9 3 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD AUG PY 1992 VL 55 IS 2 BP 235 EP 242 PG 8 WC Physics, Particles & Fields SC Physics GA JJ682 UT WOS:A1992JJ68200004 ER PT J AU YOO, HY LI, L SACKS, PG THOMPSON, LH BECKER, FF CHAN, JYH AF YOO, HY LI, L SACKS, PG THOMPSON, LH BECKER, FF CHAN, JYH TI ALTERATIONS IN EXPRESSION AND STRUCTURE OF THE DNA-REPAIR GENE XRCC1 SO BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS LA English DT Article ID SISTER-CHROMATID EXCHANGE; BLOOMS SYNDROME CELLS; STRAND BREAK-REPAIR; CHO MUTANT EM9; LIGASE-I; CHROMOSOME-ABNORMALITIES; MOLECULAR-CLONING; POLYMERASE-BETA; SENSITIVITY; CANCER C1 UNIV TEXAS, MD ANDERSON CANC CTR, DEPT MOLEC PATHOL, 1515 HOLCOMBE BLVD, HOUSTON, TX 77030 USA. UNIV TEXAS, MD ANDERSON CANC CTR, DEPT HEAD & NECK SURG & TUMOR BIOL, HOUSTON, TX 77030 USA. LAWRENCE LIVERMORE NATL LAB, DIV BIOMED SCI, LIVERMORE, CA 94550 USA. FU NCI NIH HHS [CA16672, CA47276] NR 46 TC 37 Z9 38 U1 0 U2 0 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0006-291X J9 BIOCHEM BIOPH RES CO JI Biochem. Biophys. Res. Commun. PD JUL 31 PY 1992 VL 186 IS 2 BP 900 EP 910 DI 10.1016/0006-291X(92)90831-5 PG 11 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JF844 UT WOS:A1992JF84400043 PM 1353960 ER PT J AU KRESS, JD KLIPPENSTEIN, SJ AF KRESS, JD KLIPPENSTEIN, SJ TI COMPARISON OF VARIATIONAL RRKM THEORY WITH QUANTUM SCATTERING-THEORY FOR THE NE+H-2(+)-]NEH++H REACTION SO CHEMICAL PHYSICS LETTERS LA English DT Article ID TRANSITION-STATE THEORY; CUMULATIVE REACTION PROBABILITIES; CLASSICAL MECHANICAL THEORY; UNIMOLECULAR REACTIONS; REACTION COORDINATE; COLLINEAR REACTIONS; BOND LENGTH; NE+H2+->NEH++H; SURFACE; MODEL AB A comparison between variational RRKM theory and three-dimensional quantum scattering theory calculations of the cumulative reaction probability for the Ne + H-2+ --> NeH+ + H reaction is presented. Total angular momentum J = 0 is considered with the energy ranging from the threshold for reaction (0.7144 eV) up to 1.1 eV. The variational RRKM theory calculations indicate the simultaneous presence of two separate transition state regions throughout the full energy range. Calculations which consider only the long range transition state overestimate the cumulative reaction probability. The agreement with Gaussian averaged scattering theory results is improved when statistical assumptions for the probability of oscillations from one transition state to the other are implemented. C1 CASE WESTERN RESERVE UNIV, DEPT CHEM, CLEVELAND, OH 44106 USA. RP KRESS, JD (reprint author), LOS ALAMOS NATL LAB, THEORET DIV T-12, MS B268, LOS ALAMOS, NM 87545 USA. OI Klippenstein, Stephen/0000-0001-6297-9187 NR 29 TC 15 Z9 15 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD JUL 31 PY 1992 VL 195 IS 5-6 BP 513 EP 517 DI 10.1016/0009-2614(92)85554-N PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JG998 UT WOS:A1992JG99800010 ER PT J AU LIU, AD SAUER, MC LOFFREDO, DM TRIFUNAC, AD AF LIU, AD SAUER, MC LOFFREDO, DM TRIFUNAC, AD TI TRANSIENT ABSORPTION-SPECTRA OF AROMATIC RADICAL CATIONS IN HYDROCARBON SOLUTIONS SO JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY LA English DT Article ID DETECTED MAGNETIC-RESONANCE; NANOSECOND LASER PHOTOLYSIS; PULSE-RADIOLYSIS; 2-PHOTON IONIZATION; ION RADICALS; DIMER CATION; PHOTOIONIZATION; NAPHTHALENE; PYRENE; RECOMBINATION AB Hydrocarbon solutions of toluene, naphthalene, acenaphthene, anthracene and pyrene were studied by 248 and 308 nm laser flash photolysis at room temperature. Time profiles of optical absorption and conductivity signals were taken and assigned to the formation and decay of transient radical cations. Biphotonic ionization was observed for all substrates by d.c. conductivity measurements. The overall quantum yields of free ions for the aromatic molecules studied measured by d.c. conductivity (for 248 nm laser flash photolysis) are in the range 1 x 10(-3) to 5 x 10(-3). Absorption spectra of transient radical cations were observed in all cases with the exception of toluene, where strong absorption from the excited singlet state of toluene completely obscured the radical cation signal. Similarly, the absorption of the excited singlet state of naphthalene interferes with the observation of its radical cation. C1 ARGONNE NATL LAB,DIV MED,ARGONNE,IL 60439. NR 33 TC 24 Z9 24 U1 1 U2 13 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 1010-6030 J9 J PHOTOCH PHOTOBIO A JI J. Photochem. Photobiol. A-Chem. PD JUL 31 PY 1992 VL 67 IS 2 BP 197 EP 208 DI 10.1016/1010-6030(92)85229-N PG 12 WC Chemistry, Physical SC Chemistry GA JL226 UT WOS:A1992JL22600006 ER PT J AU WEINER, MM ZAMOSCIANYK, S BURKE, GJ AF WEINER, MM ZAMOSCIANYK, S BURKE, GJ TI RADIATION EFFICIENCY AND INPUT IMPEDANCE OF MONOPOLE ELEMENTS WITH RADIAL-WIRE GROUND PLANES IN PROXIMITY TO EARTH SO ELECTRONICS LETTERS LA English DT Article DE ANTENNA THEORY; NUMERICAL METHODS AB Plots are presented of the radial efficiency and input impedance of a thin quarter-wave monopole element with a radial-wire ground plane in proximity to flat lossy Earth, as a function of the number and length of the radial wires. Numerical results are from the method-of-moments NEC-GS program developed by Lawrence Livermore National Laboratory. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP WEINER, MM (reprint author), MITRE CORP,BEDFORD,MA 01730, USA. NR 15 TC 6 Z9 6 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 JUL 30 PY 1992 VL 28 IS 16 BP 1550 EP 1551 DI 10.1049/el:19920984 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA JJ037 UT WOS:A1992JJ03700047 ER PT J AU VASUDEVAN, AK PETROVIC, JJ AF VASUDEVAN, AK PETROVIC, JJ TI A COMPARATIVE OVERVIEW OF MOLYBDENUM DISILICIDE COMPOSITES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 1ST WORKSHOP ON HIGH TEMPERATURE STRUCTURAL SILICIDES CY NOV 04-06, 1991 CL NIST, GAITHERSBURG, MD SP USN, OFF NAVAL RES HO NIST ID HIGH-TEMPERATURE DEFORMATION; SINGLE-CRYSTALS; MOSI2; MATRIX AB MoSi2-based composites possess significant potential to meet the demands of advanced high temperature structural applications in the range 1200-1600-degrees-C, in oxidizing and aggressive environments. These materials constitute and important new class of "high temperature structural silicides". The intermetallic compound MoSi2 possesses properties which make it a very desirable matrix for high temperature composites, and these properties are described and compared with those of other high melting point silicides. The developmental history of composites based on MoSi2 is traced from its beginnings to the present. Mechanical property improvements derived from SiC and ZrO2 reinforcements, as well as matrix alloying, are described, and properties of current MoSi2-based composites compared with those of silicon-based structural ceramics. Finally, important research and development directions for the continued improvement of MoSi2-based composites and their use as high temperature structural components are discussed. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP VASUDEVAN, AK (reprint author), OFF NAVAL RES,ARLINGTON,VA 22217, USA. NR 51 TC 600 Z9 669 U1 17 U2 61 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 JUL 30 PY 1992 VL 155 IS 1-2 BP 1 EP 17 DI 10.1016/0921-5093(92)90308-N PG 17 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200002 ER PT J AU KIRCHER, TA COURTRIGHT, EL AF KIRCHER, TA COURTRIGHT, EL TI ENGINEERING LIMITATIONS OF MOSI2 COATINGS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 1ST WORKSHOP ON HIGH TEMPERATURE STRUCTURAL SILICIDES CY NOV 04-06, 1991 CL NIST, GAITHERSBURG, MD SP USN, OFF NAVAL RES HO NIST ID OXIDATION AB An analysis is presented of MoSi2 for use as a protective coating against high temperature oxidation. Environmental issues such as low temperature behavior, passive-active oxidation, cyclic oxidation, and hot corrosion are reviewed. Thermal-mechanical issues such as thermal stresses, interdiffusion, and coating deformation are also presented. The ability of MoSi2 to form a protective silica film over a broad range of temperatures and the demonstrated ability to engineer coatings of MoSi2 suggest that MoSi2 may represent a significant opportunity for advancement in high temperature coating technology relative to current fused slurry silicide technology. C1 USN, CTR AIR DEV, WARMINSTER, PA 18974 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 48 TC 73 Z9 79 U1 2 U2 11 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 30 PY 1992 VL 155 IS 1-2 BP 67 EP 74 DI 10.1016/0921-5093(92)90313-P PG 8 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200007 ER PT J AU SCHWARZ, RB SRINIVASAN, SR PETROVIC, JJ MAGGIORE, CJ AF SCHWARZ, RB SRINIVASAN, SR PETROVIC, JJ MAGGIORE, CJ TI SYNTHESIS OF MOLYBDENUM DISILICIDE BY MECHANICAL ALLOYING SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 1ST WORKSHOP ON HIGH TEMPERATURE STRUCTURAL SILICIDES CY NOV 04-06, 1991 CL NIST, GAITHERSBURG, MD SP USN, OFF NAVAL RES HO NIST ID SINGLE-CRYSTALS; MOSI2; BEHAVIOR; MATRIX AB Considerable interest and effort are being directed towards developing molybdenum disilicide (MoSi2) alloys with low oxygen content. During alloy synthesis, oxygen combines with Si to form glassy SiO2 precipitates at the MoSi2 grain boundaries, resulting in a degradation of its mechanical properties. We have used mechanical alloying, a high-energy ball-milling process, to synthesize alloy powders of MoSi2, MoSi2-27 mol.% Mo5Si3, MoSi2-50 mol.% Mo5Si3 and MoSi2-50 mol.% WSi2 starting from elemental powders. The processing of the powders, as well as the loading of the powders in graphite dies, was performed under high-purity argon inside a glovebox. The finer grain and particle size of the mechanically alloyed powders enabled us to hot-press them at 1500-degrees-C, which is 300-degrees-C lower than the temperature currently used for hot-pressing commercial powders. We have been successful in reducing the oxygen content in our alloys to about 310 ppm by weight, as measured by nuclear (d,p) reactions. We report the formation of metastable phases in the mechanically alloyed powders and their characterization by X-ray diffraction and differential thermal analysis. We also report the characterization of the hot-pressed alloys by optical and transmission electron microscopy. and the measurement of high-temperature mechanical properties. C1 LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. RP SCHWARZ, RB (reprint author), LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545, USA. NR 26 TC 131 Z9 143 U1 2 U2 11 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 30 PY 1992 VL 155 IS 1-2 BP 75 EP 83 DI 10.1016/0921-5093(92)90314-Q PG 9 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200008 ER PT J AU CASTRO, RG SMITH, RW ROLLETT, AD STANEK, PW AF CASTRO, RG SMITH, RW ROLLETT, AD STANEK, PW TI DUCTILE PHASE TOUGHENING OF MOLYBDENUM DISILICIDE BY LOW-PRESSURE PLASMA SPRAYING SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 1ST WORKSHOP ON HIGH TEMPERATURE STRUCTURAL SILICIDES CY NOV 04-06, 1991 CL NIST, GAITHERSBURG, MD SP USN, OFF NAVAL RES HO NIST ID TOUGHNESS AB The low fracture toughness of MoSi2 at ambient temperature has prompted investigations into new processing methods in order to impart some degree of fracture toughness into this inherently brittle material. In the following investigation, low pressure plasma spraying was employed as a fabricating technique to produce spray-formed deposits of MoSi2 and ductile reinforced MoSi2 composites containing approximately 10 and 20 vol.% of a discontinuous tantalum lamelli reinforcement. Fracture toughness K1C measurements of MoSi2 and the MoSi2-Ta composites were done using a chevron notched four-point bend fracture toughness test in both the as-sprayed condition and after hot isostatic pressing at 1200-degrees-C and 206 MPa for 1 h. Results from the ductile reinforced MoSi2-Ta composites have shown that fracture toughness increases on the order of 200% over the as-sprayed MoSi2 (4.50 +/- 0.173 MPa m1/2 to 9.97 +/- 0.25 MPa m1/2). In addition, a marked anisotropy in fracture toughness was observed in the spray-formed deposits owing to the layered splat structure produced by the low pressure plasma spray process. C1 DREXEL UNIV,DEPT MAT ENGN,PHILADELPHIA,PA 19104. RP CASTRO, RG (reprint author), LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545, USA. RI Rollett, Anthony/A-4096-2012 OI Rollett, Anthony/0000-0003-4445-2191 NR 16 TC 23 Z9 24 U1 1 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 30 PY 1992 VL 155 IS 1-2 BP 101 EP 107 DI 10.1016/0921-5093(92)90317-T PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200011 ER PT J AU HENAGER, CH BRIMHALL, JL HIRTH, JP AF HENAGER, CH BRIMHALL, JL HIRTH, JP TI SYNTHESIS OF A MOSI2-SIC COMPOSITE INSITU USING A SOLID-STATE DISPLACEMENT REACTION SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 1ST WORKSHOP ON HIGH TEMPERATURE STRUCTURAL SILICIDES CY NOV 04-06, 1991 CL NIST, GAITHERSBURG, MD SP USN, OFF NAVAL RES HO NIST ID MORPHOLOGICAL STABILITY; MECHANICAL-PROPERTIES; SYSTEM; ZIRCONIA; CERAMICS AB A high strength in-situ composite of MoSi2-SiC was synthesized using a solid state displacement reaction between Mo2C and silicon. Diffusion couples between Mo2C and silicon processed at 1200-degrees-C revealed the formation of aligned SiC platelets in an MoSi2 matrix. The reaction zone of this couple had a Vickers microhardness of 12.8 GPa (HV 1000). In-situ composites were also synthesized by blending Mo2C and silicon powders and vacuum hot pressing for 2 h at 1350-degrees-C followed by 1 h at 1700-degrees-C. The resulting microstructure consisted of 30 vol.% SiC particles 1-mu-m in diameter uniformly dispersed in a fine-grained MoSi2 matrix. Densities of 5.53 g cm-3 were obtained together with a microhardness of 14.2 GPa (HV1000). Bend bars and chevron-notched bars cut from large-diameter, and slightly less dense, hot-pressed disks revealed a strength of 475 MPa had a fracture toughness of 6.7 MPa m1/2 at room temperature. Bend strengths increased to 515 MPa at 1000-degrees-C and then decreased to 112 MPa at 1200-degrees-C. Measured fracture toughness increased to 10.5 MPa m1/2 at 1050-degrees-C. Fractography revealed that the MoSi2 grain size was on the order of 1-2-mu-m, and it was suggested that the observed SiC particle size and aspect ratio could result in ineffective dislocation pinning and relatively rapid recovery at temperatures above the ductile-to-brittle transition temperature of MoSi2. This was substantiated by comparing these results with those obtained for SiC-whisker-reinforced MoSi2 composites. C1 WASHINGTON STATE UNIV, PULLMAN, WA 99164 USA. RP HENAGER, CH (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. OI Henager, Chuck/0000-0002-8600-6803 NR 22 TC 58 Z9 60 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 30 PY 1992 VL 155 IS 1-2 BP 109 EP 114 DI 10.1016/0921-5093(92)90318-U PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200012 ER PT J AU LOGRASSO, TA AF LOGRASSO, TA TI SYNTHESIS OF MOSI2 SINGLE-CRYSTALS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 1ST WORKSHOP ON HIGH TEMPERATURE STRUCTURAL SILICIDES CY NOV 04-06, 1991 CL NIST, GAITHERSBURG, MD SP USN, OFF NAVAL RES HO NIST AB A survey of a number of different techniques including electron beam float zone, inductively coupled plasma pedestal growth, and induction float zone in atmospheric and pressurized chambers was conducted for the synthesis of MoSi2 single crystals. These techniques were evaluated as to their suitability for growth of MoSi2. Of concern is the high vapor pressure of silicon at the melting point which can result in silicon loss and the formation of Mo5Si3. Of the techniques surveyed, pressurized induction float zone offers the best potential for compositional control during crystal growth. Some success is demonstrated using induction float zone techniques but, unfortunately, in order to maintain a stable liquid zone, crystal growth rates 3-5 times faster than typical float zone growth rates are necessary. As a result. the size of crystals prepared thus far is limited to approximately 3 mm in diameter. RP LOGRASSO, TA (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 10 TC 6 Z9 6 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 30 PY 1992 VL 155 IS 1-2 BP 115 EP 119 DI 10.1016/0921-5093(92)90319-V PG 5 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200013 ER PT J AU MALOY, SA LEWANDOWSKI, JJ HEUER, AH PETROVIC, JJ AF MALOY, SA LEWANDOWSKI, JJ HEUER, AH PETROVIC, JJ TI EFFECTS OF CARBON ADDITIONS ON THE HIGH-TEMPERATURE MECHANICAL-PROPERTIES OF MOLYBDENUM DISILICIDE SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 1ST WORKSHOP ON HIGH TEMPERATURE STRUCTURAL SILICIDES CY NOV 04-06, 1991 CL NIST, GAITHERSBURG, MD SP USN, OFF NAVAL RES HO NIST AB Additions of up to 4 wt.% C to MoSi2 caused elimination of the siliceous grain boundary phase in hot pressed samples as well as the formation of small quantities of beta-SiC and Mo5Si3C. Both the hardness and fracture toughness of the carbon-containing alloys exceeded those of the carbon-free (and oxygen-rich) materials. The toughness for all carbon-containing alloys at 800-1400-degrees-C was independent of the level of carbon addition, although the hardness at all temperatures up to 1000-degrees-C increased with the level of carbon addition. Unstable fracture was exhibited by all alloys tested below 1200-degrees-C, while stable cracking and high toughness (greater than or equal to 11.5 MPa m1/2) was obtained in the 2 wt.% C alloy at 1400-degrees-C. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RP MALOY, SA (reprint author), CASE WESTERN RESERVE UNIV,DEPT MAT SCI & ENGN,CLEVELAND,OH 44106, USA. RI Maloy, Stuart/A-8672-2009 OI Maloy, Stuart/0000-0001-8037-1319 NR 11 TC 50 Z9 54 U1 0 U2 7 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 JUL 30 PY 1992 VL 155 IS 1-2 BP 159 EP 163 DI 10.1016/0921-5093(92)90323-S PG 5 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200017 ER PT J AU MUELLER, A WANG, G RAPP, RA COURTRIGHT, EL KIRCHER, TA AF MUELLER, A WANG, G RAPP, RA COURTRIGHT, EL KIRCHER, TA TI OXIDATION BEHAVIOR OF TUNGSTEN AND GERMANIUM-ALLOYED MOLYBDENUM DISILICIDE COATINGS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 1ST WORKSHOP ON HIGH TEMPERATURE STRUCTURAL SILICIDES CY NOV 04-06, 1991 CL NIST, GAITHERSBURG, MD SP USN, OFF NAVAL RES HO NIST AB A multicomponent diffusion coating has been developed to protect niobium-base alloys from high temperature oxidation. A solid solution disilicide of molybdenum and tungsten doped with germanium provided the best protection and supported a slow-growing protective silica (SiO2) scale when exposed to high temperature oxidation. The (Mo, W)(Si,Ge)2 coating was made by reacting to a previously sputtered 70at.%Mo-30at.%W deposit in an NaF-activated cementation pack containing silicon and germanium. The germanium addition helped to improve the cyclic oxidation resistance by increasing the thermal expansion coefficient of the silica scale. The germanium also helped to avoid "pesting" (accelerated low temperature oxidation) by providing better sealant coverage at low temperatures. The results of cyclic oxidation tests performed on coated niobium coupons at 925, 1370 and 1540-degrees-C in air are presented. The coated niobium successfully passed 200 cyclic oxidation tests of 1 h at 1370-degrees-C and 60 cycles of 1 h at 1540-degrees-C. These results represent test termination points and not application limits. Accelerated low temperature oxidation and/or "pest" oxidation did not occur when the coatings were exposed to isothermal conditions of up to 200 h in air in the temperature range 500-700-degrees-C. C1 OHIO STATE UNIV, DEPT MAT SCI & ENGN, COLUMBUS, OH 43210 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. USN, CTR AIR DEV, DIV AEROSP MAT, WARMINSTER, PA 18974 USA. NR 21 TC 46 Z9 49 U1 5 U2 16 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 JUL 30 PY 1992 VL 155 IS 1-2 BP 199 EP 207 DI 10.1016/0921-5093(92)90326-V PG 9 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200020 ER PT J AU WIEDERHORN, SM GETTINGS, RJ ROBERTS, DE OSTERTAG, C PETROVIC, JJ AF WIEDERHORN, SM GETTINGS, RJ ROBERTS, DE OSTERTAG, C PETROVIC, JJ TI TENSILE CREEP OF SILICIDE COMPOSITES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 1ST WORKSHOP ON HIGH TEMPERATURE STRUCTURAL SILICIDES CY NOV 04-06, 1991 CL NIST, GAITHERSBURG, MD SP USN, OFF NAVAL RES HO NIST ID MOSI2 AB A study has been conducted on the creep behavior of a silicide composite consisting of 50 mol.% MoSi, and WSi2 reinforced with SiC whiskers. Activation energies for creep in compression and tension were 312 kJ mol-1 and 557 kJ mol-1 respectively. Stress exponents for creep were 3.2 in tension and 2.3 in compression. These values lie within the range of values obtained by other investigators. The creep resistance of the composite is considerably better than that of current alloys used in heat engines. Most of this improvement comes from the addition of SiC whiskers to the base alloy. It is suggested that the addition of higher concentrations of whiskers or particles would result in additional improvement of the creep behavior of silicide composites. C1 LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. RP WIEDERHORN, SM (reprint author), NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899, USA. NR 16 TC 26 Z9 28 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 30 PY 1992 VL 155 IS 1-2 BP 209 EP 215 DI 10.1016/0921-5093(92)90327-W PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200021 ER PT J AU SADANANDA, K FENG, CR JONES, H PETROVIC, J AF SADANANDA, K FENG, CR JONES, H PETROVIC, J TI CREEP OF MOLYBDENUM DISILICIDE COMPOSITES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 1ST WORKSHOP ON HIGH TEMPERATURE STRUCTURAL SILICIDES CY NOV 04-06, 1991 CL NIST, GAITHERSBURG, MD SP USN, OFF NAVAL RES HO NIST ID ALLOYS AB The creep deformation behavior of MoSi2, MoSi2 with SiC reinforcement, MoSi2 and WSi2 alloy, and the alloy with SiC reinforcement was determined under compression in the temperature range 1100-1450-degrees-C. The effects of reinforcement and alloying were evaluated. Existing theories of composite strengthening were examined in relation to the present results. Models based on a creeping matrix with elastically deforming fibers appear to predict the observed behavior better than any other models. Activation energies and volumes were evaluated to identify the creep mechanisms. Based on the stress exponents and the energies, it is concluded that creep progresses with increasing temperature and stress from newtonian viscous flow involving diffusion processes to power-law creep involving dislocation climb. C1 LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. RP SADANANDA, K (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 31 TC 72 Z9 74 U1 1 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 30 PY 1992 VL 155 IS 1-2 BP 227 EP 239 DI 10.1016/0921-5093(92)90329-Y PG 13 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200023 ER PT J AU MITCHELL, TE CASTRO, RG PETROVIC, JJ MALOY, SA UNAL, O CHADWICK, MM AF MITCHELL, TE CASTRO, RG PETROVIC, JJ MALOY, SA UNAL, O CHADWICK, MM TI DISLOCATIONS, TWINS, GRAIN-BOUNDARIES AND PRECIPITATES IN MOSI2 SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 1ST WORKSHOP ON HIGH TEMPERATURE STRUCTURAL SILICIDES CY NOV 04-06, 1991 CL NIST, GAITHERSBURG, MD SP USN, OFF NAVAL RES HO NIST ID SINGLE-CRYSTALS; DEFORMATION AB Hot-pressed and plasma-sprayed specimens of MoSi2 have been examined by transmission electron microscopy both in the undeformed condition and when they were deformed by bending or hot hardness indentation. Hot-pressed specimens are found to contain (100) dislocations after deformation at lower temperatures (about 600-degrees-C or lower) and 1/2[111] dislocations after deformation at higher temperatures. High energy 1/2[331] dislocations previously reported in the literature are not observed but this may be due to their intrinsic instability. Twins are commonly observed, especially in undeformed plasma-sprayed MoSi2. Analysis of diffraction patterns shows that the twin plane is {112} and the twinning direction is [111BAR]; the twin boundary is {110BAR} corresponding to a rotation twin. The twins are suggested to be variants resulting from the hexagonal-to-tetragonal transformation at high temperatures. Silica particles are frequently seen in hot-pressed material on the grain boundaries and at triple points. However, no grain boundary phase is observed, even by high resolution electron microscopy, suggesting that silica does not wet the grain boundaries. Silica is less common in plasma-sprayed MoSi2 but there is a high density of Mo5Si3 particles due to silicon loss during processing. C1 LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. CASE WESTERN RESERVE UNIV,DEPT MAT SCI & ENGN,CLEVELAND,OH 44106. MCMASTER UNIV,DEPT MAT SCI & ENGN,HAMILTON L8S 4L8,ONTARIO,CANADA. RP MITCHELL, TE (reprint author), LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545, USA. RI Maloy, Stuart/A-8672-2009 OI Maloy, Stuart/0000-0001-8037-1319 NR 15 TC 37 Z9 38 U1 0 U2 7 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 JUL 30 PY 1992 VL 155 IS 1-2 BP 241 EP 249 DI 10.1016/0921-5093(92)90330-4 PG 9 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200024 ER PT J AU PETROVIC, JJ BHATTACHARYA, AK HONNELL, RE MITCHELL, TE WADE, RK MCCLELLAN, KJ AF PETROVIC, JJ BHATTACHARYA, AK HONNELL, RE MITCHELL, TE WADE, RK MCCLELLAN, KJ TI ZRO2 AND ZRO2-SIC PARTICLE REINFORCED MOSI2 MATRIX COMPOSITES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 1ST WORKSHOP ON HIGH TEMPERATURE STRUCTURAL SILICIDES CY NOV 04-06, 1991 CL NIST, GAITHERSBURG, MD SP USN, OFF NAVAL RES HO NIST ID STABILIZED ZIRCONIA PSZ; FRACTURE-TOUGHNESS; MARTENSITIC TRANSFORMATIONS; CERAMICS; STRENGTH AB ZrO2-MoSi2 and (ZrO2-SiC)-MoSi2 composites were fabricated by hot pressing and hot pressing-hot isostatic pressing at 1700-degrees-C. No reactions between ZrO2, SiC and MoSi2 were observed. An amorphous silica glassy phase was present in all composites. Composites with unstabilized ZrO2 particles exhibited the highest room temperature fracture toughness, reaching a level three times that of pure MoSi2. Both the room temperature toughness and 1200-degrees-C strength of (ZrO2-SiC)-MoSi2 composites were higher than those of ZrO2-MoSi2 composites, indicating beneficial effects of combined reinforcement phases. Low strength levels were observed at 1400-degrees-C as a result of the presence of the silica glassy phase. Elimination of glassy phases and refinements in microstructural homogeneity are processing routes important to the optimization of the mechanical properties of these types of composites. C1 UNIV ARIZONA,ARIZONA MAT LAB,TUCSON,AZ 85721. CASE WESTERN RESERVE UNIV,DEPT MAT SCI & ENGN,CLEVELAND,OH 44106. RP PETROVIC, JJ (reprint author), LOS ALAMOS NATL LAB,CERAM SCI & TECHNOL GRP,LOS ALAMOS,NM 87545, USA. NR 18 TC 63 Z9 66 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 30 PY 1992 VL 155 IS 1-2 BP 259 EP 266 DI 10.1016/0921-5093(92)90332-U PG 8 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200026 ER PT J AU LESAR, R ROLLETT, AD SROLOVITZ, DJ AF LESAR, R ROLLETT, AD SROLOVITZ, DJ TI MODELING OF TRANSFORMATION TOUGHENING IN BRITTLE MATERIALS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 1ST WORKSHOP ON HIGH TEMPERATURE STRUCTURAL SILICIDES CY NOV 04-06, 1991 CL NIST, GAITHERSBURG, MD SP USN, OFF NAVAL RES HO NIST ID MARTENSITIC TRANSFORMATIONS; CERAMICS; COMPOSITES; GROWTH AB Results from modeling of transformation toughening in brittle materials using a discrete micromechanical model are presented. The material is represented as a two-dimensional triangular array of nodes connected by elastic springs. Microstructural effects are included by varying the spring parameters for the bulk, grain boundaries, and transforming particles. Using the width of the damage zone and the effective compliance (after the initial creation of the damage zone) as measures of fracture toughness, we find that there is a strong dependence of toughness on the amount, size, and shape of the transforming particles, with the maximum toughness achieved with the higher amounts of larger particles. C1 UNIV MICHIGAN,ANN ARBOR,MI 48109. RP LESAR, R (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Rollett, Anthony/A-4096-2012; LeSar, Richard/G-1609-2012 OI Rollett, Anthony/0000-0003-4445-2191; NR 15 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 30 PY 1992 VL 155 IS 1-2 BP 267 EP 274 DI 10.1016/0921-5093(92)90333-V PG 8 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200027 ER PT J AU VASUDEVAN, AK PETROVIC, JJ AF VASUDEVAN, AK PETROVIC, JJ TI A STRUCTURAL-MATERIALS - PROPERTIES, MICROSTRUCTURE AND PROCESSING - CONTAINING PAPERS PRESENTED AT THE PROCEEDINGS OF THE 1ST HIGH-TEMPERATURE STRUCTURAL SILICIDES WORKSHOP, NOVEMBER 4-6, 1991, GAITHERSBURG, MD, USA - PREFACE SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Editorial Material C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP VASUDEVAN, AK (reprint author), OFF NAVAL RES,ARLINGTON,VA 22217, USA. NR 0 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 30 PY 1992 VL 155 IS 1-2 BP R5 EP R5 PG 1 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200001 ER PT J AU GYULASSY, M AF GYULASSY, M TI KS PICTURES OF STRANGENESS DISTILLATION SO PHYSICS LETTERS B LA English DT Article ID HEAVY-ION COLLISIONS; QUARK-GLUON-PLASMA; PION INTERFEROMETRY; 2-PION CORRELATIONS; NUCLEAR COLLISIONS; PARAMETERS; SIGNATURE; DENSITY; MATTER AB K(s)-K(s) interferometry is shown to contain a novel interference term that is sensitive to possible strangeness distillation phenomena in high energy nuclear reactions. The absence of Coulomb final state interaction, the reduced resonance distortions, and the above novel effect make it an especially attractive complement to conventional charged boson (pi- pi- or K+ K+) interferometry. RP GYULASSY, M (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,MAILSTOP 70A-3307,BERKELEY,CA 94720, USA. NR 29 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUL 30 PY 1992 VL 286 IS 3-4 BP 211 EP 215 DI 10.1016/0370-2693(92)91763-Y PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JF888 UT WOS:A1992JF88800001 ER PT J AU ADRIANI, O AGUILARBENITEZ, M AHLEN, S AKBARI, H ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BLUMENFELD, B BOBBINK, GJ BOCCIOLINI, M BOCK, R BOHM, A BORGIA, B BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUISSON, C BUJAK, A BURGER, JD BURGER, WJ BURQ, JP BUSENITZ, J CAI, XD CAPELL, M CARIA, M CARMINATI, F CARTACCI, AM CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, J CHEN, M CHEN, ML CHEN, WY CHIEFARI, G CHIEN, CY CHMEISSANI, M CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CRIJNS, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DOVA, MT DRAGO, E DRIEVER, T DUCHESNEAU, D DUINKER, P ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GAU, SS GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOTTLICHER, P GOUGAS, A GOUJON, D GRATTA, G GRINNELL, C GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HEBBEKER, T HEBERT, M HERTEN, G HERTEN, U HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KINNISON, WW KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LETTRY, J LEYTENS, X LI, C LI, HT LI, PJ LI, XG LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LINNHOFER, D LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAO, DN MAO, YF MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MATSUDA, T MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MEINHOLZ, T MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUSS, F PEI, YJ PERRETGALLIX, D PERRIER, J PEVSNER, A PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIND, O RIZVI, HA ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SAJAN, E SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMIEMANN, K SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHUTTE, J SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SODERSTROM, E SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TAYLOR, L TIMMERMANS, C TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A VANDERZWAAN, BCC AF ADRIANI, O AGUILARBENITEZ, M AHLEN, S AKBARI, H ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BLUMENFELD, B BOBBINK, GJ BOCCIOLINI, M BOCK, R BOHM, A BORGIA, B BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUISSON, C BUJAK, A BURGER, JD BURGER, WJ BURQ, JP BUSENITZ, J CAI, XD CAPELL, M CARIA, M CARMINATI, F CARTACCI, AM CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, J CHEN, M CHEN, ML CHEN, WY CHIEFARI, G CHIEN, CY CHMEISSANI, M CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CRIJNS, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DOVA, MT DRAGO, E DRIEVER, T DUCHESNEAU, D DUINKER, P ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GAU, SS GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOTTLICHER, P GOUGAS, A GOUJON, D GRATTA, G GRINNELL, C GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HEBBEKER, T HEBERT, M HERTEN, G HERTEN, U HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KINNISON, WW KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LETTRY, J LEYTENS, X LI, C LI, HT LI, PJ LI, XG LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LINNHOFER, D LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAO, DN MAO, YF MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MATSUDA, T MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MEINHOLZ, T MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUSS, F PEI, YJ PERRETGALLIX, D PERRIER, J PEVSNER, A PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIND, O RIZVI, HA ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SAJAN, E SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMIEMANN, K SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHUTTE, J SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SODERSTROM, E SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TAYLOR, L TIMMERMANS, C TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A VANDERZWAAN, BCC TI MEASUREMENT OF INCLUSIVE ETA PRODUCTION IN HADRONIC DECAYS OF THE Z0 SO PHYSICS LETTERS B LA English DT Article ID LUND MONTE-CARLO; E+ E ANNIHILATION; JET FRAGMENTATION; PHOTON PRODUCTION; QCD; PHYSICS; SPECTRA; PARTON AB We present a study of the inclusive eta-production based on 300 000 hadronic Z0 decays. The measured inclusive momentum distribution can be reproduced by parton shower Monte Carlo programs and also by an analytical QCD calculation. Comparing our results with low energy e+ e- data, we find that QCD describes both the shape and the energy evolution of the eta-spectrum. The comparison of eta-production rates in quark- and gluon-enriched jet samples does not show statistically significant evidence for more abundant production of eta-mesons in gluon fragmentation. C1 IST NAZL FIS NUCL, SEZIONE NAPOLI, I-80125 NAPLES, ITALY. IST NAZL FIS NUCL, SEZIONE PERUGIA, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. UNIV FLORENCE, I-50125 FLORENCE, ITALY. CTR INVEST ENERGET MEDIOAMBIENTALES & TECNOL, E-28040 MADRID, SPAIN. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. BOSTON UNIV, BOSTON, MA 02215 USA. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. NAPLES UNIV, I-80125 NAPLES, ITALY. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA, SWITZERLAND. SWISS FED INST TECHNOL, CH-8093 ZURICH, SWITZERLAND. MIT, CAMBRIDGE, MA 02139 USA. ST PETERSBURG NUCL PHYS INST, ST PETERSBURG 188350, USSR. IST NAZL FIS NUCL, SEZIONE BOL, I-40126 BOLOGNA, ITALY. BULGARIAN ACAD SCI, INST MECHATRON, BU-1113 SOFIA, BULGARIA. MOSCOW THEORET & EXPTL PHYS INST, MOSCOW 117259, USSR. RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. NATL INST NUCL PHYS, SEZIONE ROMA, ROME, ITALY. TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA. RHEIN WESTFAL TH AACHEN, INST PHYS 3, W-5100 AACHEN, GERMANY. UNIV ALABAMA, TUSCALOOSA, AL 35486 USA. LAB PHYS PARTICULES, F-74519 ANNECY LE VIEUX, FRANCE. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY. NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. UNIV ROME LA SAPIENZA, I-00185 ROME, ITALY. UNIV CALIF SAN DIEGO, SAN DIEGO, CA 92182 USA. CATHOLIC UNIV NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. PRINCETON UNIV, PRINCETON, NJ 08544 USA. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NATL INST HIGH ENERGY PHYS, 6525 ED NIJMEGEN, NETHERLANDS. CHINESE UNIV SCI & TECHNOL, HEFEI, ANHUI 230029, PEOPLES R CHINA. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. SHANGHAI INST CERAM, SHANGHAI, PEOPLES R CHINA. INST HOCHENERGIEPHYS, O-1615 ZEUTHEN, GERMANY. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. HARVARD UNIV, CAMBRIDGE, MA 02139 USA. CALTECH, PASADENA, CA 91125 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37830 USA. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. UNIV LYON 1, INST PHYS NUCL LYON, INST NATL PHYS NUCL & PHYS PARTICULES, CNRS, F-69622 VILLEURBANNE, FRANCE. RP ADRIANI, O (reprint author), IST NAZL FIS NUCL, SEZIONE FIRENZE, I-50125 FLORENCE, ITALY. RI D'Alessandro, Raffaello/F-5897-2015; Chmeissani, Mokhtar/G-4346-2015; Hoorani, Hafeez/D-1791-2013; Arce, Pedro/L-1268-2014; Kamyshkov, Yuri/J-7999-2016; van der Zwaan, Bob/F-4070-2015; Fiandrini, Emanuele/C-4549-2008; Leijtens, Xaveer/F-3302-2010; Ludovici, Lucio/F-5917-2011; Servoli, Leonello/E-6766-2012; bertucci, bruna/J-5237-2012; Cerrada, Marcos/J-6934-2014; Gonzalez Romero, Enrique/L-7561-2014; Vogel, Helmut/N-8882-2014; Ferguson, Thomas/O-3444-2014; Berdugo, Javier/A-2858-2015 OI D'Alessandro, Raffaello/0000-0001-7997-0306; Chmeissani, Mokhtar/0000-0002-2287-4791; Arce, Pedro/0000-0003-3009-0484; Kamyshkov, Yuri/0000-0002-3789-7152; Filthaut, Frank/0000-0003-3338-2247; van der Zwaan, Bob/0000-0001-5871-7643; Leijtens, Xaveer/0000-0001-7794-8236; Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920; Vogel, Helmut/0000-0002-6109-3023; Ferguson, Thomas/0000-0001-5822-3731; Berdugo, Javier/0000-0002-7911-8532 NR 24 TC 25 Z9 25 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD JUL 30 PY 1992 VL 286 IS 3-4 BP 403 EP 412 DI 10.1016/0370-2693(92)91795-B PG 10 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JF888 UT WOS:A1992JF88800033 ER PT J AU NEUMANN, ER OLSEN, KH BALDRIDGE, WS SUNDVOLL, B AF NEUMANN, ER OLSEN, KH BALDRIDGE, WS SUNDVOLL, B TI THE OSLO RIFT - A REVIEW SO TECTONOPHYSICS LA English DT Review ID PB ISOTOPE GEOCHEMISTRY; SOUTHEAST NORWAY; SE NORWAY; REGION; ROCKS; GRABEN; FENNOSCANDIA; REFLECTIVITY; LITHOSPHERE; REFRACTION AB The tectonomagmatic history of the Oslo Rift may be Subdivided into 5 main periods. Stage 1 (> 300 Ma): development of a shallow depression. Stage 2 (300-295 Ma): roughly simultaneous onset of widespread basalt volcanism (B1) and vertical movement along NNW-SSE- to N-S-trending faults. Stage 3 (295-275 Ma): main rifting period, accompanied by volcanism dominated by rhomb porphyry lavas (latites). Stage 4 (275-240 Ma): change of magmatic style from basaltic shield volcanism to central volcanoes of mixed compositions, many of which went through caldera collapses, intrusion of composite batholiths of intermediate to granitic compositions. Stage 5 (< 240 Ma): dike intrusions may have continued into Triassic time. Both the crust and total lithosphere under the rift are thinned relative to the Precambrian basement on both sides. A 12-km-thick high-density and high-velocity body occupies the lower crust along the rift axis and extends under the eastern and western rift-shoulder. Petrological and geochemical data imply that this massive layer represents dense cumulates and gabbroic rocks formed from mantle-derived magmas in deep crustal magma-chambers. Two mantle sources, one nearly undepleted (age corrected epsilon(Nd) of about + 1 and epsilon(Sr) of -10 to -15), the other mildly depleted (epsilon(Nd) of about +4, espilon(Sr) of -10), contributed melts to the Oslo Rift magmatism. The two sources are interpreted as different parts of a heterogeneous upper mantle which, before the rifting event, belonged to the subcontinental lithosphere. On their way to the surface, the mantle-derived magmas were retained in deep crustal magma chambers where they underwent extensive fractional crystallization, some also suffered moderate contamination. Anatectic melts, and melts formed by mixing between mantle-derived and anatectic melts, gave rise to syenitic and granitic intrusions. C1 GEOPHYS CONSULTING SERV INT,LYNNWOOD,WA 98046. LOS ALAMOS NATL LAB,DIV EARTH & ENVIRONM SCI,LOS ALAMOS,NM 87545. RP NEUMANN, ER (reprint author), UNIV OSLO,MIN GEOL MUSEUM,SARSGATE 1,N-0562 OSLO 5,NORWAY. NR 111 TC 78 Z9 81 U1 3 U2 22 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-1951 J9 TECTONOPHYSICS JI Tectonophysics PD JUL 30 PY 1992 VL 208 IS 1-3 BP 1 EP 18 DI 10.1016/0040-1951(92)90333-2 PG 18 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA JK744 UT WOS:A1992JK74400002 ER PT J AU LYU, PCC ZHOU, HXX JELVEH, N WEMMER, DE KALLENBACH, NR AF LYU, PCC ZHOU, HXX JELVEH, N WEMMER, DE KALLENBACH, NR TI POSITION-DEPENDENT STABILIZING EFFECTS IN ALPHA-HELICES - N-TERMINAL CAPPING IN SYNTHETIC MODEL PEPTIDES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID AMINO-ACIDS; FORMING TENDENCIES; SIDE-CHAINS; ALANINE; GLYCINE C1 NYU,DEPT CHEM,4 WASHINGTON PL,NEW YORK,NY 10003. LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720. RI Zhou, Huan-Xiang/M-5170-2016 OI Zhou, Huan-Xiang/0000-0001-9020-0302 NR 25 TC 78 Z9 78 U1 0 U2 3 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 JUL 29 PY 1992 VL 114 IS 16 BP 6560 EP 6562 DI 10.1021/ja00042a047 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA JF871 UT WOS:A1992JF87100047 ER PT J AU WANG, AC KENNEDY, MA REID, BR DROBNY, GP AF WANG, AC KENNEDY, MA REID, BR DROBNY, GP TI A SOLID-STATE H-2 NMR RELAXATION STUDY OF A 12-BASE PAIR RNA DUPLEX SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID NUCLEAR MAGNETIC-RESONANCE; OPTIMIZED PARAMETERS; DNA; MOTION; DYNAMICS; BASES C1 UNIV WASHINGTON, DEPT CHEM, SEATTLE, WA 98195 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP WANG, AC (reprint author), UNIV WASHINGTON, DEPT BIOCHEM, SEATTLE, WA 98195 USA. NR 16 TC 13 Z9 13 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUL 29 PY 1992 VL 114 IS 16 BP 6583 EP 6585 DI 10.1021/ja00042a063 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA JF871 UT WOS:A1992JF87100063 ER PT J AU BAI, GR CHANG, HLM KIM, HK FOSTER, CM LAM, DJ AF BAI, GR CHANG, HLM KIM, HK FOSTER, CM LAM, DJ TI EPITAXY-INDUCED PHASE OF NEAR-STOICHIOMETRY PBTIO3 FILMS PREPARED BY METALORGANIC CHEMICAL VAPOR-DEPOSITION SO APPLIED PHYSICS LETTERS LA English DT Article AB Ferroelectric PbTiO3 thin films have been prepared by a low-pressure MOCVD process. Epitaxial films with a crystal structure of a bulk equilibrium tetragonal phase were readily obtained within a range of growth conditions. However, by providing excess Pb in the growth process, we have observed an epitaxy-induced phase for near-stoichiometry PbTiO3 which possesses a perovskite-like, but possible, orthorhombic structure. C1 PUSAN NATL UNIV,DEPT PHYS,PUSAN,SOUTH KOREA. RP BAI, GR (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 4 TC 19 Z9 19 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 27 PY 1992 VL 61 IS 4 BP 408 EP 410 DI 10.1063/1.107897 PG 3 WC Physics, Applied SC Physics GA JE821 UT WOS:A1992JE82100013 ER PT J AU BERN, Z KOSOWER, DA AF BERN, Z KOSOWER, DA TI THE COMPUTATION OF LOOP AMPLITUDES IN GAUGE-THEORIES SO NUCLEAR PHYSICS B LA English DT Article ID SHELL STRING AMPLITUDES; MULTI-GLUON SCATTERING; DIMENSIONAL REGULARIZATION; QCD AMPLITUDES; 4 DIMENSIONS; MODELS; SUPERSTRINGS; ORBIFOLDS; BREMSSTRAHLUNG; SUPERGRAVITY AB We present a detailed derivation of a new and efficient technique based on the technology of four-dimensional heterotic strings, for computing one-loop amplitudes in gauge theories, along with expressions for the one-loop dimensionally regularized helicity amplitudes for the process with four external gluons. We also give a set of computational rules pre-supposing ignorance of string theory. C1 FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP BERN, Z (reprint author), UNIV PITTSBURGH,DEPT PHYS,PITTSBURGH,PA 15260, USA. NR 65 TC 400 Z9 400 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL 27 PY 1992 VL 379 IS 3 BP 451 EP 561 DI 10.1016/0550-3213(92)90134-W PG 111 WC Physics, Particles & Fields SC Physics GA JF851 UT WOS:A1992JF85100001 ER PT J AU BHATTACHARJEE, P HILL, CT SCHRAMM, DN AF BHATTACHARJEE, P HILL, CT SCHRAMM, DN TI GRAND UNIFIED THEORIES, TOPOLOGICAL DEFECTS, AND ULTRAHIGH-ENERGY COSMIC-RAYS SO PHYSICAL REVIEW LETTERS LA English DT Article ID SPECTRUM; STRINGS; NEUTRINOS AB The ultrahigh-energy (UHE) proton and neutrino spectra resulting from collapse or annihilation of topological defects surviving from the grand unification (GUT) era are calculated. Irrespective of the specific process under consideration, the UHE proton spectrum "recovers" at approximately 1.8 x 10(11) GeV after a partial Greisen-Zatsepin-Kuz'min "cutoff" at approximately 5 x 10(10) GeV and continues to a GUT-scale energy with a universal shape determined by the physics of hadronic jet fragmentation. The shape of the UHE neutrino spectrum is, however, sensitive also to the cosmological evolution of the defects involved. C1 FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP BHATTACHARJEE, P (reprint author), UNIV CHICAGO,ENRICO FERMI INST,CTR ASTRON & ASTROPHYS,5640 S ELLIS AVE,CHICAGO,IL 60637, USA. NR 20 TC 201 Z9 204 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 JUL 27 PY 1992 VL 69 IS 4 BP 567 EP 570 DI 10.1103/PhysRevLett.69.567 PG 4 WC Physics, Multidisciplinary SC Physics GA JE754 UT WOS:A1992JE75400004 ER PT J AU HUGHES, RJ DEUTCH, BI AF HUGHES, RJ DEUTCH, BI TI ELECTRIC CHARGES OF POSITRONS AND ANTIPROTONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID 2-PHOTON SPECTROSCOPY; LASER SPECTROSCOPY; RYDBERG CONSTANT; 1S-2S TRANSITION; HYDROGEN; MASS; DECAYS AB Tests of the electric charges carried by the positron and antiproton are derived from recent measurements of the cyclotron frequencies of these particles, and from the spectroscopy of exotic atoms in which they are constituents. C1 AARHUS UNIV,INST PHYS & ASTRON,DK-8000 AARHUS,DENMARK. RP HUGHES, RJ (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. NR 41 TC 63 Z9 63 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 27 PY 1992 VL 69 IS 4 BP 578 EP 581 DI 10.1103/PhysRevLett.69.578 PG 4 WC Physics, Multidisciplinary SC Physics GA JE754 UT WOS:A1992JE75400007 ER PT J AU MCCLELLAND, JB TADDEUCCI, TN CHEN, XY ALFORD, WP BYRD, RC CAREY, TA DELUCIA, S GOODMAN, CD GULMEZ, E HUANG, W LUTHER, B MARCHLENSKI, DG MERCER, DJ PROUT, DL RAPAPORT, J RYBARYCK, LJ SAILOR, W SUGARBAKER, E WANG, Y WHITTEN, C AF MCCLELLAND, JB TADDEUCCI, TN CHEN, XY ALFORD, WP BYRD, RC CAREY, TA DELUCIA, S GOODMAN, CD GULMEZ, E HUANG, W LUTHER, B MARCHLENSKI, DG MERCER, DJ PROUT, DL RAPAPORT, J RYBARYCK, LJ SAILOR, W SUGARBAKER, E WANG, Y WHITTEN, C TI QUASI-FREE POLARIZATION-TRANSFER MEASUREMENTS IN THE ((P)RIGHT-ARROW, (N)RIGHT-ARROW) REACTION AT 495 MEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID SPIN ISOSPIN INTERACTION; PROTON-SCATTERING; OBSERVABLES AB Results from a complete set of polarization-transfer observables for quasifree (p -->, n -->) scattering at 495 MeV are reported. Measurements were carried out on CD2, carbon, and calcium targets at a laboratory scattering angle of 18-degrees using the new neutron time-of-flight facility at LAMPF. The ratio of spin-longitudinal to spin-transverse responses at a momentum transfer of approximately 1.72 fm-1 is extracted from the data and compared to distorted-wave calculations incorporating a random-phase approximation description of the nuclear response. No enhancement is observed in the experimental ratio. C1 UNIV COLORADO,BOULDER,CO 80309. OHIO STATE UNIV,COLUMBUS,OH 43210. OHIO UNIV,ATHENS,OH 45701. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. INDIANA UNIV,CYCLOTRON FACIL,BLOOMINGTON,IN 47405. UNIV WESTERN ONTARIO,LONDON N6A 3K7,ONTARIO,CANADA. RP MCCLELLAND, JB (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Gulmez, Erhan/P-9518-2015 OI Gulmez, Erhan/0000-0002-6353-518X NR 19 TC 69 Z9 69 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 JUL 27 PY 1992 VL 69 IS 4 BP 582 EP 585 DI 10.1103/PhysRevLett.69.582 PG 4 WC Physics, Multidisciplinary SC Physics GA JE754 UT WOS:A1992JE75400008 ER PT J AU FISCH, NJ RAX, JM AF FISCH, NJ RAX, JM TI INTERACTION OF ENERGETIC ALPHA-PARTICLES WITH INTENSE LOWER HYBRID WAVES SO PHYSICAL REVIEW LETTERS LA English DT Article ID DRIFT INSTABILITY; CURRENT DRIVE AB Lower hybrid waves are a demonstrated, continuous means of driving toroidal current in a tokamak. When these waves propagate in a tokamak fusion reactor, in which there are energetic alpha-particles, there are conditions under which the alpha-particles do not appreciably damp, and may even amplify, the wave, thereby enhancing the current-drive effect. Waves traveling in one poloidal direction, in addition to being directed in one toroidal direction, are shown to be the most efficient drivers of current in the presence of the energetic alpha-particles. C1 CEN CADARACHE,ASSOC EURATOM CEA SUR FUS CONTROLEE,F-13115 ST PAUL DURANCE,FRANCE. RP FISCH, NJ (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 16 TC 159 Z9 160 U1 1 U2 14 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 JUL 27 PY 1992 VL 69 IS 4 BP 612 EP 615 DI 10.1103/PhysRevLett.69.612 PG 4 WC Physics, Multidisciplinary SC Physics GA JE754 UT WOS:A1992JE75400016 ER PT J AU ALMASAN, CC HAN, SH LEE, BW PAULIUS, LM MAPLE, MB VEAL, BW DOWNEY, JW PAULIKAS, AP FISK, Z SCHIRBER, JE AF ALMASAN, CC HAN, SH LEE, BW PAULIUS, LM MAPLE, MB VEAL, BW DOWNEY, JW PAULIKAS, AP FISK, Z SCHIRBER, JE TI PRESSURE-DEPENDENCE OF TC AND CHARGE-TRANSFER IN YBA2CU3OX (6.35 LESS-THAN-OR-EQUAL-TO X LESS-THAN-OR-EQUAL-TO 7) SINGLE-CRYSTALS SO PHYSICAL REVIEW LETTERS LA English DT Article ID SUPERCONDUCTIVITY; HOLE; TEMPERATURE; ANOMALIES; GROWTH; OXIDES AB The superconducting critical temperature T(c) of YBa2Cu3Ox single crystals (6.3 5 less than or similar to x less than or similar to 7) has been measured resistively as a function of pressure P (0 less-than-or-equal-to P less than or similar to 20 kbar). The initial rate dT(c)/dP exhibits three distinct regimes, a narrow plateau near x almost-equal-to 7 with dT(c)/dP almost-equal-to 0.04 K/kbar, a plateau in the range 6.4 less than or similar to x less than or similar to 6.8, where dT(c)/dP-0.43 K/kbar, and a maximum value approximately 0.8 K/kbar at x almost-equal-to 6.35. An analysis of the T(c)(x,P) data using a phenomenological model yields a pronounced peak near x=6.8 in d-dELTA-n(h)(x)/dP, where DELTA-n(h)(x) is the change in the hole density in the CUO2 Planes relative to the value corresponding to the fully oxygenated sample. C1 UNIV CALIF SAN DIEGO,INST PURE & APPL PHYS SCI,LA JOLLA,CA 92093. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP ALMASAN, CC (reprint author), UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093, USA. NR 24 TC 119 Z9 119 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 JUL 27 PY 1992 VL 69 IS 4 BP 680 EP 683 DI 10.1103/PhysRevLett.69.680 PG 4 WC Physics, Multidisciplinary SC Physics GA JE754 UT WOS:A1992JE75400033 ER PT J AU HURLIMANN, MD PENNINGTON, CH FAN, NQ CLARKE, J PINES, A HAHN, EL AF HURLIMANN, MD PENNINGTON, CH FAN, NQ CLARKE, J PINES, A HAHN, EL TI PULSED FOURIER-TRANSFORM NQR OF N-14 WITH A DC SQUID SO PHYSICAL REVIEW LETTERS LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; SPIN-LATTICE RELAXATION; AMMONIUM-PERCHLORATE; FIELD; NH4CLO4 AB The zero-field free induction decay of solid ammonium perchlorate at 1.5 K has been directly detected with a dc superconducting quantum interference device. The Fourier-transform spectrum consists of three sharp lines at 17.4, 38.8, and 56.2 kHz arising from pure N-14 nucLear quadrupole resonance transitions. The absence of splittings and resonance transitions from dipolar-coupled proton spins is attributed to reorientation of the ammonium groups by quantum tunneling in combination with motional averaging in the three proton levels characterized by the irreducible representation T. The measured N-14 spin-spin relaxation time is 22+/-2 ms and the spin-lattice relaxation time is 63+/-6 ms. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. NR 27 TC 25 Z9 25 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 27 PY 1992 VL 69 IS 4 BP 684 EP 687 DI 10.1103/PhysRevLett.69.684 PG 4 WC Physics, Multidisciplinary SC Physics GA JE754 UT WOS:A1992JE75400034 ER PT J AU ROSENBERG, AH PATEL, SS JOHNSON, KA STUDIER, FW AF ROSENBERG, AH PATEL, SS JOHNSON, KA STUDIER, FW TI CLONING AND EXPRESSION OF GENE-4 OF BACTERIOPHAGE-T7 AND CREATION AND ANALYSIS OF T7 MUTANTS LACKING THE 4A-PRIMASE HELICASE OR THE 4B-HELICASE SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID RNA-POLYMERASE; ESCHERICHIA-COLI; LAC REPRESSOR; NUCLEOTIDE-SEQUENCE; REPLICATION INVITRO; CLONED FRAGMENTS; DNA; PROTEIN; PRIMASE; SYSTEM AB T7 gene 4, which is required for DNA replication, specifies two proteins whose coding sequences overlap in the same reading frame: the 4A protein, a 566-amino acid primase/helicase, and the 4B protein, a 503-amino acid helicase whose initiation codon is the 64th codon of the 4A protein. To study better the individual functions of these two overlapping proteins, we made clones that express both 4A and 4B proteins, only 4B protein, or only what we refer to as the 4A' protein, in which methionine 64 is replaced by leucine, thereby eliminating the 4B initiation codon. These clones provide considerably more gene 4 protein for biochemical analysis than do infected cells. They can also be used to isolate and propagate T7 gene 4 deletion mutants, and we have made T7 mutants which lack all gene 4 coding sequences, or which express 4A' protein but no 4B protein, or 4B protein but no 4A protein. Analysis of these phage mutants shows that 4A' protein without any 4B protein can support essentially normal replication and growth, whereas 4B protein without any 4A protein supports little replication or growth. Apparently, the primase activity of the 4A protein is essential for replication, but the 4B protein is dispensable, presumably because the 4A protein also supplies helicase activity. The mutation at amino acid 64 of 4A' appears to have little effect on 4A function. The rate of replication during normal T7 infection appears to be limited by the amount of gene 4 protein, but too high a level of either 4A or 4B protein is inhibitory to growth. C1 PENN STATE UNIV,DEPT MOLEC & CELL BIOL,UNIV PK,PA 16802. RP ROSENBERG, AH (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. FU NIGMS NIH HHS [GM13135, GM21872, GM44613] NR 34 TC 36 Z9 36 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 JUL 25 PY 1992 VL 267 IS 21 BP 15005 EP 15012 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JF088 UT WOS:A1992JF08800075 PM 1321823 ER PT J AU PATEL, SS ROSENBERG, AH STUDIER, FW JOHNSON, KA AF PATEL, SS ROSENBERG, AH STUDIER, FW JOHNSON, KA TI LARGE-SCALE PURIFICATION AND BIOCHEMICAL-CHARACTERIZATION OF T7-PRIMASE HELICASE PROTEINS - EVIDENCE FOR HOMODIMER AND HETERODIMER FORMATION SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID BACTERIOPHAGE-T7 DEOXYRIBONUCLEIC-ACID; NUCLEOSIDE 5'-TRIPHOSPHATASE ACTIVITY; LAGGING STRAND SYNTHESIS; PRIMED DNA-SYNTHESIS; GENE-4 PROTEIN; ESCHERICHIA-COLI; REPLICATION INVITRO; ADENOSINE-TRIPHOSPHATASE; PRIMASE-HELICASE; ATP HYDROLYSIS AB A rapid purification procedure produces milligram amounts of the T7 gene 4A' primase/helicase, 4B helicase, and the wild-type 4AB proteins expressed from the clones described in the accompanying paper (Rosenberg, A. H., Patel, S. S., Johnson, K. A., and Studier, F. W. (1992) J. Biol. Chem. 267, 15005-15012). Purified 4A' protein (in which the wild-type methionine at amino acid 64 has been replaced by leucine to eliminate the 4B initiation codon) appears to be equivalent to the wild-type 4A protein in primase, helicase, and NTPase activities. Gel filtration chromatography and polyacrylamide gel electrophoresis of native proteins indicate that the 4A' and 4B proteins form homodimers and heterodimers in solution. Heterodimer formation presumably accounts for an observed 3-fold increase in the primase activity of 4A' upon addition of 4B that lacks primase activity of its own. Steady-state k(cat) and K(m) values for hydrolysis of the nucleoside triphosphates ATP, dATP, dTTP, and dGTP were measured for 4A', 4B, 4A'B (1:1), and wild-type 4AB (1:2) proteins. The dependence of the dNTPase activities on the concentration was hyperbolic, suggesting single or noncooperative binding sites, whereas ATPase activity was sigmoidal, suggesting more than one ATP binding site. The k(cat)/K(m) ratios for hydrolysis of the dNTPs by the four protein preparations were within a factor of 6 of each other. The 1:1 mixture of 4A'B had the highest k(cat)/K(m) ratios, with a preference for dATP and dTTP. C1 PENN STATE UNIV,DEPT MOLEC & CELL BIOL,UNIV PK,PA 16802. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. FU NIGMS NIH HHS [GM13135, GM21872, GM44613] NR 43 TC 75 Z9 75 U1 0 U2 2 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD JUL 25 PY 1992 VL 267 IS 21 BP 15013 EP 15021 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JF088 UT WOS:A1992JF08800076 PM 1321824 ER PT J AU DATSKOS, PG CHRISTOPHOROU, LG CARTER, JG AF DATSKOS, PG CHRISTOPHOROU, LG CARTER, JG TI TEMPERATURE-ENHANCED AUTODETACHMENT FROM C-C4F6-ASTERISK SO CHEMICAL PHYSICS LETTERS LA English DT Article ID ELECTRON-ATTACHMENT; DETACHMENT; GASES AB The autodetachment of the long-lived c-C4F6-* anion was found to increase with increasing temperature. T, over the range 300 to 550 K. The autodetachment coefficient, delta, was measured as a function of T in a buffer gas of N2 at a mean electron energy of almost-equal-to 0.33 eV, Under these same conditions the electron attachment coefficient, eta, decreases with increasing T for T greater than or similar to 450 K. C1 UNIV TENNESSEE, DEPT PHYS & ASTRON, KNOXVILLE, TN 37996 USA. RP DATSKOS, PG (reprint author), OAK RIDGE NATL LAB, DIV HLTH & SAFETY RES, ATOM MOLEC & HIGH VOLTAGE PHYS GRP, OAK RIDGE, TN 37831 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 JUL 24 PY 1992 VL 195 IS 4 BP 329 EP 332 DI 10.1016/0009-2614(92)85611-D PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JH380 UT WOS:A1992JH38000008 ER PT J AU SUN, ZW BARNETT, RN LESTER, WA AF SUN, ZW BARNETT, RN LESTER, WA TI QUANTUM AND VARIATIONAL MONTE-CARLO INTERACTION POTENTIALS FOR LI2 (X1-SIGMA-G+) SO CHEMICAL PHYSICS LETTERS LA English DT Article ID INTERMEDIATE INTERNUCLEAR SEPARATIONS; MOLECULAR ELECTRONIC-STRUCTURE; MCSCF-CL CALCULATIONS; LOWEST LYING STATES; LITHIUM DIMER; LI-2; CURVES; FLUORESCENCE; DISSOCIATION; LI-7(2) AB Optimized trial functions are used in quantum Monte Carlo and variational Monte Carlo calculations of the Li2 (X1-SIGMA(g)+) potential curve. The trial functions used are a product of a Slater determinant of molecular orbitals multiplied by correlation functions of electron-nuclear and electron-electron separation. The parameters of the determinant and correlation functions are optimized simultaneously by reducing the deviations of the local energy E(L)(E(L) = PSI(T)-1 H-PSI(T), where PSI(T) denotes a trial function) over a fixed sample. At the equilibrium separation, the variational Monte Carlo and quantum Monte Carlo methods recover 68% and 98% of the correlation energy, respectively. At other points on the curves, these methods yield similar accuracies. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. CHINESE ACAD SCI,INST MECH,BEIJING,PEOPLES R CHINA. NR 23 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 JUL 24 PY 1992 VL 195 IS 4 BP 365 EP 370 DI 10.1016/0009-2614(92)85618-K PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JH380 UT WOS:A1992JH38000015 ER PT J AU MACKAY, R FRANZEN, HF AF MACKAY, R FRANZEN, HF TI SINGLE-CRYSTAL X-RAY STUDY OF ZR3NIO SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Letter C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP MACKAY, R (reprint author), IOWA STATE UNIV SCI & TECHNOL,DOE,AMES LAB,AMES,IA 50011, USA. NR 4 TC 5 Z9 5 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD JUL 24 PY 1992 VL 186 IS 1 BP L7 EP L10 DI 10.1016/0925-8388(92)90614-F PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA JF594 UT WOS:A1992JF59400002 ER PT J AU MARKOVIC, N ROSS, PN AF MARKOVIC, N ROSS, PN TI THE EFFECT OF SPECIFIC ADSORPTION OF IONS AND UNDERPOTENTIAL DEPOSITION OF COPPER ON THE ELECTROOXIDATION OF METHANOL ON PLATINUM SINGLE-CRYSTAL SURFACES SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID BISULFATE ADSORPTION; ELECTROSORPTION; VOLTAMMETRY; PT(111); ANIONS; ELECTROCATALYSIS; SPECTROSCOPY AB The specific adsorption of anions in acid electrolytes containing sulfuric and hydrochloric acids was found to have a strongly inhibiting effect on the rate of methanol electro-oxidation on both the (111) and (100) surfaces of platinum. The effect was much stronger in hydrochloric acid, requiring approximately three orders of magnitude higher concentration of sulfuric acid to achieve the same inhibiting effect (and surface coverage by adsorbed anion). Cl- adsorption isotherms were measured using the emersion technique and ex situ Auger electron spectroscopy analysis. The mechanism of inhibition appeared to be similar for both anions. On the (111) surface, anion adsorption was found to proceed in two stages, one coupled to hydrogen desorption producing a co-adsorbed state, and a second stage of adsorption at more positive potentials into the anion adlattice from which hydrogen has been desorbed. The second stage process on Pt(100) is different, occurring at more positive potentials than on Pt(111) and concurrent with OH formation. Completion of the second stage of adsorption appears to produce the inhibition that causes a current peak to be observed in the voltammetry of methanol in acids containing these anions. Underpotential deposition (UPD) of copper in acids containing these electrolytes caused strong additional inhibition of the methanol oxidation rate. The effect was attributed to induced anion adsorption on platinum atoms near to the UPD copper atoms due to a lowering of the local pzc by the copper adatoms. C1 UNIV BELGRADE,INST ELECTROCHEM,ICTM,BELGRADE,YUGOSLAVIA. RP MARKOVIC, N (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 38 TC 143 Z9 144 U1 1 U2 24 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 JUL 24 PY 1992 VL 330 IS 1-2 BP 499 EP 520 DI 10.1016/0022-0728(92)80327-Z PG 22 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA JJ301 UT WOS:A1992JJ30100011 ER PT J AU DAVID, SA DEBROY, T AF DAVID, SA DEBROY, T TI CURRENT ISSUES AND PROBLEMS IN WELDING SCIENCE SO SCIENCE LA English DT Article ID ALLOYING ELEMENT VAPORIZATION; STAINLESS-STEEL WELDS; GAS TUNGSTEN ARCS; RAPID SOLIDIFICATION; METAL VAPORS; LASER; PLASMA; POOL; MICROSTRUCTURES; ABSORPTION AB Losses of life and property due to catastrophic failure of structures are often traced to defective welds. However, major advances have taken place in welding science and technology in the last few decades. With the development of new methodologies at the crossroad of basic and applied sciences, the promise of science-based tailoring of composition, structure, and properties of the weldments may be fulfilled. This will require resolution of several contemporary issues and problems concerning the structure and properties of the weldments as well as intelligent control and automation of the welding processes. C1 PENN STATE UNIV, DEPT MAT SCI & ENGN, University Pk, PA 16802 USA. OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37831 USA. RI DebRoy, Tarasankar/A-2106-2010 NR 74 TC 133 Z9 134 U1 5 U2 67 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUL 24 PY 1992 VL 257 IS 5069 BP 497 EP 502 DI 10.1126/science.257.5069.497 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JE755 UT WOS:A1992JE75500018 PM 17778680 ER PT J AU WELLS, SG CROWE, BM MCFADDEN, LD AF WELLS, SG CROWE, BM MCFADDEN, LD TI MEASURING THE AGE OF THE LATHROP WELLS VOLCANIC CENTER AT YUCCA MOUNTAIN SO SCIENCE LA English DT Article ID RADIOACTIVE-WASTE REPOSITORY; SOUTHERN NEVADA C1 LOS ALAMOS NATL LAB,LAS VEGAS,NV 89109. UNIV NEW MEXICO,DEPT GEOL,ALBUQUERQUE,NM 87131. RP WELLS, SG (reprint author), UNIV CALIF RIVERSIDE,DEPT EARTH SCI 036,RIVERSIDE,CA 92521, USA. NR 19 TC 11 Z9 11 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 JUL 24 PY 1992 VL 257 IS 5069 BP 555 EP 556 DI 10.1126/science.257.5069.555 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JE755 UT WOS:A1992JE75500037 PM 17778687 ER PT J AU HILTON, MR BAUER, R DIDZIULIS, SV DUGGER, MT KEEM, JM SCHOLHAMER, J AF HILTON, MR BAUER, R DIDZIULIS, SV DUGGER, MT KEEM, JM SCHOLHAMER, J TI STRUCTURAL AND TRIBOLOGICAL STUDIES OF MOS2 SOLID LUBRICANT FILMS HAVING TAILORED METAL-MULTILAYER NANOSTRUCTURES SO SURFACE & COATINGS TECHNOLOGY LA English DT Article ID THIN-FILMS; COATINGS AB Molybdenum disulfide (MoS2)solid lubricant films were prepared by r.f. magnetron sputtering on 440C steel, 52100 steel, and silicon substrates. This study concentrated on films that were multilayer coatings of MoS2 with either nickel or Au-(20%)Pd metal interlayers. Multilayer thicknesses ranged from 0.2 nm to 1.0 nm while the multilayer periodic spacing ranged from 3 to 10 nm. Scanning electron microscopy and X-ray diffraction revealed that the multilayer films had dense microstructures that, in some cases, exhibited significant orientation of their basal planes parallel to the substrate. Film endurance was assessed in sliding contact using thrust washer tests and in rolling contact using thrust bearing tests. Some film microstructures exhibited excellent endurance. Brale indentation indicated that the metal layers can improve film fracture toughness. Friction in air and ultrahigh vacuum (UHV) was investigated using a UHV-compatible test apparatus. Friction coefficients between 0.05 and 0.08 were measured in UHV. C1 SANDIA NATL LABS,DIV 1832,ALBUQUERQUE,NM 87185. OVON SYNTHET MAT CORP,TROY,MI 48084. RP HILTON, MR (reprint author), AEROSPACE CORP,CTR MECH & MAT TECHNOL,EL SEGUNDO,CA 90245, USA. NR 24 TC 104 Z9 104 U1 3 U2 37 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD JUL 24 PY 1992 VL 53 IS 1 BP 13 EP 23 DI 10.1016/0257-8972(92)90099-V PG 11 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA JE372 UT WOS:A1992JE37200002 ER PT J AU LEVANON, H MEIKLYAR, V MICHAELI, A MICHAELI, S REGEV, A AF LEVANON, H MEIKLYAR, V MICHAELI, A MICHAELI, S REGEV, A TI PARAMAGNETIC STATES AND DYNAMICS OF PHOTOEXCITED C-60 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID ELECTRON-SPIN-RESONANCE; FULLERENES C60; MOLECULAR-DYNAMICS; FLASH-PHOTOLYSIS; LIQUID-CRYSTALS; TRIPLET-STATES; SOLID-STATE; SPECTROSCOPY; SPECTRA; PROBE AB Photoexcited triplet and photoinduced doublet states of C60, oriented in a nematic liquid crystal (LC) and toluene, were studied by time-domain EPR. The data indicate that in both matrices, C-3(60) undergoes temperature dependent molecular rotation. However, whereas in the LC the rotation rate is increased monotonously between 7 and 298 K, the dynamics in toluene depends strongly on its phase diagram. About the melting point of toluene, a polarized doublet is observed concurrently with the disappearance of the triplet. At higher temperatures, where the liquid phase prevails, the dynamics of the photoinduced doublet suggests an unpaired electron delocalized on an aggregate of C60 in toluene, with relatively long-lived magnetization of approximately 25-mu-s. C1 HEBREW UNIV JERUSALEM,FARKAS CTR LIGHT INDUCED PROC,IL-91904 JERUSALEM,ISRAEL. HEBREW UNIV JERUSALEM,DIV CHEM,IL-91904 JERUSALEM,ISRAEL. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP LEVANON, H (reprint author), HEBREW UNIV JERUSALEM,DEPT PHYS CHEM,IL-91904 JERUSALEM,ISRAEL. NR 26 TC 42 Z9 42 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUL 23 PY 1992 VL 96 IS 15 BP 6128 EP 6131 DI 10.1021/j100194a009 PG 4 WC Chemistry, Physical SC Chemistry GA JF326 UT WOS:A1992JF32600009 ER PT J AU POLLARD, WT DEXHEIMER, SL WANG, Q PETEANU, LA SHANK, CV MATHIES, RA AF POLLARD, WT DEXHEIMER, SL WANG, Q PETEANU, LA SHANK, CV MATHIES, RA TI THEORY OF DYNAMIC ABSORPTION-SPECTROSCOPY OF NONSTATIONARY STATES .4. APPLICATION TO 12-FS RESONANT IMPULSIVE RAMAN-SPECTROSCOPY OF BACTERIORHODOPSIN SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID PUMP-PROBE SPECTROSCOPY; STIMULATED LIGHT-SCATTERING; OPTICAL TRANSMISSION-CORRELATION; TWO-DIMENSIONAL SPECTROSCOPY; FEMTOSECOND DYNAMICS; POLYATOMIC-MOLECULES; QUANTUM BEATS; CONDENSED PHASES; LIOUVILLE-SPACE; LINE SHAPES AB A time-dependent theory for femtosecond dynamic absorption spectroscopy is used to describe the creation and observation of molecular ground-state vibrational coherence through the resonant impulsive stimulated Raman mechanism. Model calculations show that the oscillatory absorption signal that arises from this ground-state coherence is maximized for a limited range of pulse lengths and that there is a complex relationship between the probe wavelength and the strength of the spectral oscillations. The generalized time-dependent linear susceptibility of the nonstationary system created by the impulsive pump pulse is defined and used to discuss the strong dependence of the measured signals on the properties of the probe pulse. Finally, calculations are presented to analyze the high-frequency oscillations (approximately 20-fs period) recently observed in the transient absorption spectra of light-adapted bacteriorhodopsin (BR568) following excitation with a 12-fs optical pulse. At the probe wavelengths used in this experiment, the contribution of stimulated emission is negligible at long times because of the extremely rapid excited-state isomerization; as a result, the spectral oscillations observed after this time are due to the impulsive excitation of coherent vibrations in the ground state. The transient response observed for BR568 is calculated using a 29-mode harmonic potential surface derived from a prior resonance Raman intensity analysis. Both the oscillatory signals and their dependence on the probe wavelength are satisfactorily reproduced. C1 UNIV CALIF BERKELEY, DEPT CHEM & PHYS, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. NR 68 TC 192 Z9 193 U1 0 U2 38 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUL 23 PY 1992 VL 96 IS 15 BP 6147 EP 6158 DI 10.1021/j100194a013 PG 12 WC Chemistry, Physical SC Chemistry GA JF326 UT WOS:A1992JF32600013 ER PT J AU YEE, GG FULTON, JL SMITH, RD AF YEE, GG FULTON, JL SMITH, RD TI FOURIER-TRANSFORM INFRARED-SPECTROSCOPY OF MOLECULAR-INTERACTIONS OF HEPTAFLUORO-1-BUTANOL OR 1-BUTANOL IN SUPERCRITICAL CARBON-DIOXIDE AND SUPERCRITICAL ETHANE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID SOLVENTS; THERMODYNAMICS; ISOBUTANE; PROPANE; PHASE AB Fourier transform infrared (FT-IR) spectroscopy was used to measure the degree of intermolecular hydrogen bonding for 2,2,3,3,4,4,4-heptafluoro-1-butanol-d and 1-butanol-d in supercritical carbon dioxide and supercritical ethane solvents. Supercritical binary solutions containing up to 0.10 mol fraction alcohol were examined under conditions ranging from 200 to 400 bar at 40-degrees-C. In these fluids, an equilibrium appears to be established between the free non-hydrogen-bonded monomer and various hydrogen-bonded species. Aggregation numbers of these alcohols in carbon dioxide were in the range of 3.9-4.4 molecules per aggregate. The aggregate size in CO2 was, within experimental error, the same as found for supercritical ethane. Solute-solvent interactions were described using a semiempirical dielectric continuum model (Kirkwood-Bauer-Magat). The spectral evolution of a particular vibrational mode provided molecular level detail on the transition from a gas- to liquidlike solvation environment as the density of the supercritical fluid solvent was increased. The high solubility of the fluorinated alcohol in low dielectric constant fluids such as CO2 is primarily attributed to the weaker hydrogen-bonding energies of the fluorinated alcohol relative to those of the protonated alcohols. The contribution of fluorine repulsion to decreases in the attractive solute-solute interactions (i.e., steric hindrance) also acts to increase solubility in low dielectric constant supercritical fluids. 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 48 TC 113 Z9 114 U1 1 U2 17 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 JUL 23 PY 1992 VL 96 IS 15 BP 6172 EP 6181 DI 10.1021/j100194a017 PG 10 WC Chemistry, Physical SC Chemistry GA JF326 UT WOS:A1992JF32600017 ER PT J AU REDDY, NRS PICOREL, R SMALL, GJ AF REDDY, NRS PICOREL, R SMALL, GJ TI B896 AND B870 COMPONENTS OF THE RHODOBACTER-SPHAEROIDES ANTENNA - A HOLE BURNING STUDY SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID PURPLE PHOTOSYNTHETIC BACTERIA; EXCITATION-ENERGY TRANSFER; PIGMENT-PROTEIN COMPLEX; ELECTRON-DONOR STATE; BACTERIOCHLOROPHYLL-A; RHODOPSEUDOMONAS-SPHAEROIDES; PROSTHECOCHLORIS-AESTUARII; TRANSFER DYNAMICS; LOW-TEMPERATURE; ABSORPTION AB Novel nonphotochemical hole burning action spectra are persented that yield the low-temperature absorption profiles of B896 and B870 and their underlying structures (linear electron-phonon coupling and site inhomogeneous broadening). The results establish that B896 and B870 are associated with the far more intense B875 and B850 bacteriochlorophyll a absorption bands, respectively, of the light harvesting I and II complexes. The homogeneous widths of the B896 and B870 zero-phonon holes are the same within experimental uncertainty, 3.2 cm-1 at 4.2 K, which corresponds to a total optical dephasing time of 6.6 ps. A number of interpretations for B870 and B896 are considered. Favored is one in which they are due to the lowest energy levels of the B850* and B875* exciton bands (asterisk denoting the S1(Q(y)) state). Based on studies of the dephasing of excitons in organic crystals, the 6.6-ps dephasing of B896* is attributed to exciton scattering with energetic inequivalent neighboring unit cells. Such scattering and B870 to B875 energy transfer are suggested to be contributors to the dephasing of B870*. The effect of glasslike structural heterogeneity on the optical selection rules for unit cells of cyclic symmetry is also considered. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. CSIC,EE AULA DEI,E-50080 ZARAGOZA,SPAIN. RI PICOREL, RAFAEL/K-7930-2014 OI PICOREL, RAFAEL/0000-0003-3791-129X NR 71 TC 150 Z9 152 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 JUL 23 PY 1992 VL 96 IS 15 BP 6458 EP 6464 DI 10.1021/j100194a065 PG 7 WC Chemistry, Physical SC Chemistry GA JF326 UT WOS:A1992JF32600065 ER PT J AU VLACHY, V PRAUSNITZ, JM AF VLACHY, V PRAUSNITZ, JM TI DONNAN EQUILIBRIUM - HYPERNETTED-CHAIN STUDY OF ONE-COMPONENT AND MULTICOMPONENT MODELS FOR AQUEOUS POLYELECTROLYTE SOLUTIONS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID HIGHLY ASYMMETRIC ELECTROLYTES; INTEGRAL-EQUATION; SIMULATION; POLYMER; LIQUID AB The hypernetted-chain integral equation has been applied to two polyelectrolyte models to study the Donnan equilibrium for an aqueous mixture containing large polyions and ordinary ionized salts. The first is a traditional one-component model with the polyions interacting via a screened Coulomb potential. The second is a multicomponent model, which describes the solution as an aqueous mixture of a highly asymmetric electrolyte where polyions, counterions, and co-ions are represented by charged hard spheres. The polyion-polyion distribution functions and the Donnan pressure are evaluated for a range of typical experimental conditions for aqueous solutions of globular proteins. The results show that a screened Coulomb potential model provides a good approximation if the charge on the polyions is not too high. However, there are some important differences between the results of one-component and multicomponent models for the polyion-polyion distribution function. At concentrations above 1 M of simple electrolyte, there is a region of interparticle distances for which the potential of mean force is attractive according to the multicomponent model; while this effect is not reproduced by the one-component model based on the screened Coulomb potential alone, it is shown correctly when we include an "osmotic" potential due to the presence of the small ions. Using the hypernetted-chain theory, a one-component model provides a successful analysis of experimental osmotic-pressure data of aqueous solutions of bovine serum albumin in 0.15 M sodium chloride for albumin concentrations up to 450 g/L. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. NR 33 TC 58 Z9 58 U1 0 U2 6 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 JUL 23 PY 1992 VL 96 IS 15 BP 6465 EP 6469 DI 10.1021/j100194a066 PG 5 WC Chemistry, Physical SC Chemistry GA JF326 UT WOS:A1992JF32600066 ER PT J AU GETZOFF, ED CABELLI, DE FISHER, CL PARGE, HE VIEZZOLI, MS BANCI, L HALLEWELL, RA AF GETZOFF, ED CABELLI, DE FISHER, CL PARGE, HE VIEZZOLI, MS BANCI, L HALLEWELL, RA TI FASTER SUPEROXIDE-DISMUTASE MUTANTS DESIGNED BY ENHANCING ELECTROSTATIC GUIDANCE SO NATURE LA English DT Article ID PULSE RADIOLYSIS; COPPER; ENZYME; SIMULATION; MECHANISM; DIFFUSION; SUBSTRATE; SEQUENCE; PROTEIN; SITE AB THE enzyme Cu, Zn superoxide dismutase (SOD) protects against oxidative damage by dismuting the superoxide radical O2.- to molecular oxygen and hydrogen peroxide1-3 at the active-site Cu ion4,5 in a reaction that is rate-limited by diffusion3,6 and enhanced by electrostatic guidance7-10. SOD has evolved to be one of the fastest enzymes known (V(max) approximately 2 x 10(9) M-1 s-1)6,11. The new crystal structures of human SOD12 show that amino-acid site chains that are implicated in electrostatic guidance8 (Glu 132, Glu 133 and Lys 136) form a hydrogen-bonding network. Here we show that site-specific mutants that increase local positive charge while maintaining this orienting network (Glu --> Gln) have faster reaction rates and increased ionic-strength dependence, matching brownian dynamics simulations incorporating electrostatic terms. Increased positive charge alone is insufficient: one charge reversal (Glu --> Lys) mutant is slower than the equivalent charge neutralization (Glu --> Gln) mutant, showing that the newly introduced positive charge disrupts the orienting network. Thus, electrostatically facilitated diffusion rates can be increased by design, provided the detailed structural integrity of the active-site electrostatic network is maintained. C1 BROOKHAVEN NATL LAB, DEPT CHEM, LONG ISL, NY 11973 USA. UNIV FLORENCE, DEPT CHEM, I-50121 FLORENCE, ITALY. CHIRON CORP, EMERYVILLE, CA 94608 USA. RP GETZOFF, ED (reprint author), SCRIPPS RES INST, DEPT MOLEC BIOL, LA JOLLA, CA 92037 USA. NR 32 TC 317 Z9 320 U1 0 U2 16 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD JUL 23 PY 1992 VL 358 IS 6384 BP 347 EP 351 DI 10.1038/358347a0 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JE684 UT WOS:A1992JE68400069 PM 1353610 ER PT J AU BJORKEN, JD BRODSKY, SJ LU, HJ AF BJORKEN, JD BRODSKY, SJ LU, HJ TI RAPIDITY-GAP EVENTS IN E+E- ANNIHILATION SO PHYSICS LETTERS B LA English DT Article ID QUANTUM CHROMODYNAMICS AB We discuss the significance of events containing rapidity-gaps in high-energy scattering processes, in particular in e+e-annihilation and/or W, Z decays. We compute explicitly the fraction of events containing rapidity-gaps in e+e- --> qqqqBAR and e+e- --> qqggBAR processes at low jet-pair invariant mass limit. These events follow a distinctive sin2-theta distribution in the jet-pair scattering angle. Similar processes are candidate backgrounds for important Higgs and W+W- scattering physics at the SSC and LHC. RP BJORKEN, JD (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 18 TC 26 Z9 26 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUL 23 PY 1992 VL 286 IS 1-2 BP 153 EP 159 DI 10.1016/0370-2693(92)90173-2 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JG159 UT WOS:A1992JG15900025 ER PT J AU KODAMA, K USHIDA, N MOKHTARANI, A PAOLONE, VS VOLK, JT WILCOX, JO YAGER, PM EDELSTEIN, RM FREYBERGER, AP GIBAUT, DB LIPTON, RJ NICHOLS, WR POTTER, DM RUSS, JS ZHANG, C ZHANG, Y JANG, HI KIM, JY KIM, TI LIM, IT PAC, MY BALLER, BR STEFANSKI, RJ NAKAZAWA, K CHUNG, KS CHUNG, SH KIM, DC PARK, IG PARK, MS SONG, JS YOON, CS CHIKAWA, M ABE, T FUJII, T FUJIOKA, G FUJIWARA, K FUKUSHIMA, H HARA, T TAKAHASHI, Y TARUMA, K TSUZUKI, Y YOKOYAMA, C CHANG, SD CHEON, BG CHO, JH KANG, JS KIM, CO KIM, KY KIM, TY LEE, JC LEE, SB LIM, GY NAM, SW SHIN, TS SIM, KS WOO, JK ISOKANE, Y TSUNEOKA, Y AOKI, S GAUTHIER, A HOSHINO, K KITAMURA, H KOBAYASHI, M MIYANISHI, M NAKAMURA, K NAKAMURA, M NAKAMURA, Y NAKANISHI, S NIU, K NIWA, K TAJIMA, H DUNLEA, JM FREDERIKSEN, SG KURAMATA, S LUNDBERG, BG OLEYNIK, GA REAY, NW REIBEL, K SIDWELL, RA STANTON, NR MORIYAMA, K SHIBATA, H KALBFLEISCH, GR SKUBIC, P SNOW, JM WILLIS, SE KUSUMOTO, O NAKAMURA, K OKUSAWA, T TERANAKA, M TOMINAGA, T YOSHIDA, T YUUKI, H OKABE, H YOKOTA, J ADACHI, M KAZUNO, M NIU, E SHIBUYA, H WATANABE, S OHTSUKA, I SATO, Y TEZUKA, I BAHK, SY KIM, SK AF KODAMA, K USHIDA, N MOKHTARANI, A PAOLONE, VS VOLK, JT WILCOX, JO YAGER, PM EDELSTEIN, RM FREYBERGER, AP GIBAUT, DB LIPTON, RJ NICHOLS, WR POTTER, DM RUSS, JS ZHANG, C ZHANG, Y JANG, HI KIM, JY KIM, TI LIM, IT PAC, MY BALLER, BR STEFANSKI, RJ NAKAZAWA, K CHUNG, KS CHUNG, SH KIM, DC PARK, IG PARK, MS SONG, JS YOON, CS CHIKAWA, M ABE, T FUJII, T FUJIOKA, G FUJIWARA, K FUKUSHIMA, H HARA, T TAKAHASHI, Y TARUMA, K TSUZUKI, Y YOKOYAMA, C CHANG, SD CHEON, BG CHO, JH KANG, JS KIM, CO KIM, KY KIM, TY LEE, JC LEE, SB LIM, GY NAM, SW SHIN, TS SIM, KS WOO, JK ISOKANE, Y TSUNEOKA, Y AOKI, S GAUTHIER, A HOSHINO, K KITAMURA, H KOBAYASHI, M MIYANISHI, M NAKAMURA, K NAKAMURA, M NAKAMURA, Y NAKANISHI, S NIU, K NIWA, K TAJIMA, H DUNLEA, JM FREDERIKSEN, SG KURAMATA, S LUNDBERG, BG OLEYNIK, GA REAY, NW REIBEL, K SIDWELL, RA STANTON, NR MORIYAMA, K SHIBATA, H KALBFLEISCH, GR SKUBIC, P SNOW, JM WILLIS, SE KUSUMOTO, O NAKAMURA, K OKUSAWA, T TERANAKA, M TOMINAGA, T YOSHIDA, T YUUKI, H OKABE, H YOKOTA, J ADACHI, M KAZUNO, M NIU, E SHIBUYA, H WATANABE, S OHTSUKA, I SATO, Y TEZUKA, I BAHK, SY KIM, SK TI MEASUREMENT OF THE BRANCHING RATIO FOR D+-](K)BAR-ASTERISK(892)0-MU+NU SO PHYSICS LETTERS B LA English DT Article ID CU INTERACTIONS; FORM-FACTORS; QUARK-MODEL; D-DECAYS; B-DECAY; PI-CU; POLARIZATION; FRACTIONS; MESONS; GEV/C AB The branching ratio for the decay mode D+ --> K*0-mu+-nu-BAR has been measured with two methods. The first uses D0 --> K--mu+-nu for normalization, and yields the result B(D+ --> K*0-mu+-nu)=(3.25+/-0.71+/-0.75)%. From this method we also obtain the direct measurement-GAMMA(D+ --> K*0-mu+-nu)/GAMMA(D0 --> K--mu+-nu)=0.43+/-0.09+/-0.09. The second method uses the mode D+ --> K-pi+-pi+ for normalization and yields B(D+ --> K*0-mu+-nu)=(4.18+/-0.66+/-0.96)%. Combining the results of the two methods yields B(D+ --> K*0-mu+-nu)=(3.57+/-0.96)%. C1 UNIV CALIF DAVIS,DAVIS,CA 95616. CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. CHONNAM NATL UNIV,KWANGJU 500757,SOUTH KOREA. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. GIFU UNIV,GIFU 50111,JAPAN. GYEONGSANG NATL UNIV,JINJU 660300,SOUTH KOREA. KINKI UNIV,HIGASHIOSAKA,OSAKA 577,JAPAN. KOBE UNIV,KOBE 657,JAPAN. UNIV KOREA,SEOUL 136701,SOUTH KOREA. NAGOYA INST TECHNOL,NAGOYA,AICHI 466,JAPAN. NAGOYA UNIV,NAGOYA,AICHI 464,JAPAN. OHIO STATE UNIV,COLUMBUS,OH 43210. OKAYAMA UNIV,OKAYAMA 700,JAPAN. UNIV OKLAHOMA,NORMAN,OK 73019. OSAKA CITY UNIV,OSAKA 558,JAPAN. SCI EDUC INST OSAKA PREFECTURE,OSAKA 558,JAPAN. TOHO UNIV,FUNABASHI,CHIBA 274,JAPAN. UTSUNOMIYA UNIV,UTSUNOMIYA,TOCHIGI 321,JAPAN. WONKWANG UNIV,IRI 570749,SOUTH KOREA. RP KODAMA, K (reprint author), AICHI UNIV EDUC,KARIYA 448,JAPAN. RI Russ, James/P-3092-2014; Aoki, Shigeki/L-6044-2015 OI Russ, James/0000-0001-9856-9155; NR 41 TC 43 Z9 43 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUL 23 PY 1992 VL 286 IS 1-2 BP 187 EP 194 DI 10.1016/0370-2693(92)90179-8 PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JG159 UT WOS:A1992JG15900031 ER PT J AU FRABETTI, PL BOGART, CW CHEUNG, HWK CULY, S CUMALAT, JP BUTLER, JN DAVENPORT, F GAINES, I GARBINCIUS, PH GOURLAY, S HARDING, DJ KASPER, P KREYMER, A LEBRUN, P MENDEZ, H BIANCO, S ENORINI, M FABBRI, FL SPALLONE, A ZALLO, A CULBERTSON, R JAROSS, G LINGEL, K SHELDON, PD WILSON, JR WISS, J ALIMONTI, G BELLINI, G DICORATO, M GIAMMARCHI, M LEVERARO, F MALVEZZI, S MENASCE, D MERONI, E MORONI, L PEDRINI, D PERASSO, L SALA, A SALA, S TORRETTA, D VITTONE, M BUCHHOLZ, D CASTOLDI, C GOBBI, B PARK, S YOSHIDA, R BISHOP, JM BUSENITZ, JK CASON, NM CUNNINGHAM, JD GARDNER, RW KENNEDY, CJ MANNEL, EJ MOUNTAIN, RJ PUSELJIC, DL RUCHTI, RC SHEPHARD, WD ZANABRIA, ME BOCA, G RATTI, SP VITULO, P LOPEZ, A AF FRABETTI, PL BOGART, CW CHEUNG, HWK CULY, S CUMALAT, JP BUTLER, JN DAVENPORT, F GAINES, I GARBINCIUS, PH GOURLAY, S HARDING, DJ KASPER, P KREYMER, A LEBRUN, P MENDEZ, H BIANCO, S ENORINI, M FABBRI, FL SPALLONE, A ZALLO, A CULBERTSON, R JAROSS, G LINGEL, K SHELDON, PD WILSON, JR WISS, J ALIMONTI, G BELLINI, G DICORATO, M GIAMMARCHI, M LEVERARO, F MALVEZZI, S MENASCE, D MERONI, E MORONI, L PEDRINI, D PERASSO, L SALA, A SALA, S TORRETTA, D VITTONE, M BUCHHOLZ, D CASTOLDI, C GOBBI, B PARK, S YOSHIDA, R BISHOP, JM BUSENITZ, JK CASON, NM CUNNINGHAM, JD GARDNER, RW KENNEDY, CJ MANNEL, EJ MOUNTAIN, RJ PUSELJIC, DL RUCHTI, RC SHEPHARD, WD ZANABRIA, ME BOCA, G RATTI, SP VITULO, P LOPEZ, A TI STUDY OF D(0)-]K(S)0-PI+PI- AND D(0)-]K(S)0K+K- IN HIGH-ENERGY PHOTOPRODUCTION SO PHYSICS LETTERS B LA English DT Article ID D-MESONS; DECAYS AB Analysis of the resonant and non-resonant branching fractions for the decays D0 --> K(S)0-pi+-pi- and D0 --> K(s)0K+K- is presented. For the D0 --> K(S)0-pi+-pi- decay, a fit to the observed Dalitz plot was performed to determine the complex amplitudes of the subcomponent modes. For the D0 --> K(S)0K+K- decay, measurements of the branching ratios D0 --> K(S)0K+K- (inclusive), D0 --> K(S)0-phi, and D0 --> K(S)0 (K+K-)non-phi relative to the D0 --> K(S)0-pi+-pi-mode are reponed. The data were collected by the Fermilab high energy photoproduction experiment E687. C1 IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. UNIV COLORADO,BOULDER,CO 80309. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,NAZL FRASCATI LAB,I-00044 FRASCATI,ITALY. UNIV ILLINOIS,URBANA,IL 61801. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. NORTHWESTERN UNIV,EVANSTON,IL 60208. UNIV NOTRE DAME,NOTRE DAME,IN 46556. IST NAZL FIS NUCL,I-27100 PAVIA,ITALY. UNIV PAVIA,DIPARTIMENTO FIS NUCL,I-27100 PAVIA,ITALY. UNIV PUERTO RICO,MAYAGUEZ,PR 00708. RP FRABETTI, PL (reprint author), UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. RI Menasce, Dario Livio/A-2168-2016 OI bianco, stefano/0000-0002-8300-4124; Menasce, Dario Livio/0000-0002-9918-1686 NR 10 TC 7 Z9 7 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 JUL 23 PY 1992 VL 286 IS 1-2 BP 195 EP 200 DI 10.1016/0370-2693(92)90180-C PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JG159 UT WOS:A1992JG15900032 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E ALEKSEEV, GD ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANASSONTZIS, EG ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORGEAUD, P BORISOV, G BORNER, H 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 BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C CASTELLI, E GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CIRIO, R CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAGORET, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DASILVA, W DEFOIX, C DELIKARIS, D DELLARICCIA, BA DELORME, S DELPIERRE, P DEMARIA, N DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEARNLEY, TA FEINDT, M ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOVATYUK, VM CADENAS, JJGY GOOBAR, A GOPAL, G GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E GROSSEWIESMANN, P GROSSETETE, B GUY, J HAEDINGER, U HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HULTH, PO HULTQVIST, K IOANNOU, P ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KROLIKOWSKI, J KRONKVIST, I KRSTIC, J KRUENERMARQUIS, U KRUPINSKI, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LETESSIERSELVON, A LEVY, JM LIEB, E LIKO, D LILLETHUN, E LINDGREN, J 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 MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARON, T MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MIKULEC, I 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 NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PASSERI, A PEGORARO, M PENNANEN, J PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PETROLINI, A PETTERSEN, TE PIERRE, F PIMENTA, M PINGOT, O POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSI, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMIRNOV, N SMITH, GR SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TOMARADZE, A TORASSA, E TORTORA, L TRAINOR, MT TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VARELA, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VILANOVA, D VITALE, L VLASOV, E VLASSOPOULOS, S VODOPYANOV, AS VOLLMER, M VOLPONI, S VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEHR, A WEIERSTALL, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZITOUN, R ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J AF ABREU, P ADAM, W ADYE, T AGASI, E ALEKSEEV, GD ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANASSONTZIS, EG ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORGEAUD, P BORISOV, G BORNER, H 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 BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C CASTELLI, E GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CIRIO, R CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAGORET, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DASILVA, W DEFOIX, C DELIKARIS, D DELLARICCIA, BA DELORME, S DELPIERRE, P DEMARIA, N DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEARNLEY, TA FEINDT, M ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOVATYUK, VM CADENAS, JJGY GOOBAR, A GOPAL, G GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E GROSSEWIESMANN, P GROSSETETE, B GUY, J HAEDINGER, U HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HULTH, PO HULTQVIST, K IOANNOU, P ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KROLIKOWSKI, J KRONKVIST, I KRSTIC, J KRUENERMARQUIS, U KRUPINSKI, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LETESSIERSELVON, A LEVY, JM LIEB, E LIKO, D LILLETHUN, E LINDGREN, J 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 MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARON, T MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MIKULEC, I 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 NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PASSERI, A PEGORARO, M PENNANEN, J PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PETROLINI, A PETTERSEN, TE PIERRE, F PIMENTA, M PINGOT, O POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSI, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMIRNOV, N SMITH, GR SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TOMARADZE, A TORASSA, E TORTORA, L TRAINOR, MT TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VARELA, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VILANOVA, D VITALE, L VLASOV, E VLASSOPOULOS, S VODOPYANOV, AS VOLLMER, M VOLPONI, S VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEHR, A WEIERSTALL, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZITOUN, R ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J TI BOSE-EINSTEIN CORRELATIONS IN THE HADRONIC DECAYS OF THE Z(0) SO PHYSICS LETTERS B LA English DT Article ID LUND MONTE-CARLO; E+E ANNIHILATION; PION INTERFEROMETRY; JET FRAGMENTATION; MASS-ENERGY; COLLISIONS; COHERENCE; PHYSICS; 34-GEV AB Bose-Einstein correlations between pairs of like-sign charged particles produced in e+e- annihilations near the Z0 peak have been studied using data taken with the DELPHI detector at LEP. An enhancement is found in the production of pairs of identical pions of similar momenta, with respect to a reference sample. Under the hypothesis that the pions are emitted by a spherically symmetrical source with gaussian density, the data indicate a radius of the source of r = 0.62 +/- 0.04(stat.) +/- 0.20(syst.) fm. The large systematic uncertainty reflects the sensitivity of r to the choice of the reference sample. C1 OSTERREICH,AKAD WISSENSCH,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. NATL INST PHYS & HIGH ENERGY PHYS,1009 DB AMSTERDAM,NETHERLANDS. JOINT INST NUCL RES DUBNA,101000 MOSCOW,USSR. UNIV VALENCIA,CSIC,INST FIS CORPUSCULAR,CTR MIXTO,E-46100 BURJASSOT,SPAIN. UNIV VALENCIA,DEPT FIS ATOM MOLEC & NUCL,E-46100 BURJASSOT,SPAIN. UNIV LUND,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. UNIV LYON 1,F-69622 VILLEURBANNE,FRANCE. UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE 1,GERMANY. UNIV STOCKHOLM,INST PHYS,S-11346 STOCKHOLM,SWEDEN. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE. UNIV GRENOBLE 1,INST SCI NUCL,F-38026 GRENOBLE,FRANCE. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. IST NAZL FIS NUCL,INST SUPER SANITA,I-00161 ROME,ITALY. UNIV COMPLUTENSE,E-28040 MADRID,SPAIN. UNIV OXFORD,NUCL PHYS LAB,OXFORD OX1 3RH,ENGLAND. UNIV PARIS 06,LPNHE,F-75230 PARIS 05,FRANCE. UNIV PARIS 07,F-75230 PARIS 05,FRANCE. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. PONTIFICIA UNIV CATOLICA RIO DE JANEIRO,DEPT FIS,BR-22453 RIO DE JANEIRO,BRAZIL. COLL FRANCE,PHYS CHIM RAYONNEMENTS LAB,F-75231 PARIS 05,FRANCE. SERPUKHOV INST HIGH ENERGY PHYS,142284 PROTVINO,USSR. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. UNIV LOUIS PASTEUR,CTR RECH NUCL,INST NATL PHYS NUCL & PHYS PARTICULES,CNRS,F-67037 STRASBOURG,FRANCE. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. VRIJE UNIV BRUSSELS,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,SERV PHYS PARTICULES ELEMENTAIRES,B-7000 MONS,BELGIUM. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. UNIV ROME 2,DIPARTIMENTO FIS,I-00173 ROME,ITALY. IST NAZL FIS NUCL,I-00173 ROME,ITALY. CENS,DEPT PHYS PARTICULES ELEMENT,F-91191 GIF SUR YVETTE,FRANCE. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,I-35131 PADUA,ITALY. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV SANTANDER,FAC CIENCIAS,E-39005 SANTANDER,SPAIN. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV HELSINKI,HIGH ENERGY PHYS RES INST,SF-00170 HELSINKI 17,FINLAND. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. UNIV LANCASTER,SCH PHY & MAT,LANCASTER LA1 4YB,ENGLAND. CTR BRASILEIRO PESQUISAS,BR-22290 RIO DE JANEIRO,BRAZIL. UNIV AIX MARSEILLE 2,F-13288 MARSEILLE 09,FRANCE. RP ABREU, P (reprint author), LIP,AV ELIAS GARCIA 14-LE,P-1000 LISBON,PORTUGAL. RI de Groot, Nicolo/A-2675-2009; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Shellard, Ronald/G-4825-2012; 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; Dracos, Marcos/K-2335-2012; Hallgren, Allan/A-8963-2013; Botner, Olga/A-9110-2013; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Vaz, Pedro/K-2464-2013; Monge, Maria Roberta/G-9127-2012; Ridky, Jan/H-6184-2014; Zukanovich Funchal, Renata/C-5829-2013; Fernandez, Ester/K-9734-2014; Pimenta, Mario/M-1741-2013; Gomez Cadenas, Juan Jose/L-2003-2014; Ragazzi, Stefano/D-2463-2009; Roditi, Itzhak/O-7448-2014; Zuniga, Juan/P-4385-2014; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Lozano-Bahilo, Julio/F-4881-2016; Olshevskiy, Alexander/I-1580-2016; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; OI Ruiz, Alberto/0000-0002-3639-0368; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; Andreazza, Attilio/0000-0001-5161-5759; 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; Zukanovich Funchal, Renata/0000-0001-6749-0022; Pimenta, Mario/0000-0002-2590-0908; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Ragazzi, Stefano/0000-0001-8219-2074; Roditi, Itzhak/0000-0003-2363-5626; Zuniga, Juan/0000-0002-1041-6451; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Lozano-Bahilo, Julio/0000-0003-0613-140X; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; 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; Sannino, Mario/0000-0001-7700-8383; 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 NR 28 TC 84 Z9 84 U1 1 U2 19 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 JUL 23 PY 1992 VL 286 IS 1-2 BP 201 EP 210 DI 10.1016/0370-2693(92)90181-3 PG 10 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JG159 UT WOS:A1992JG15900033 ER PT J AU YOO, CS NELLIS, WJ SATTLER, ML MUSKET, RG AF YOO, CS NELLIS, WJ SATTLER, ML MUSKET, RG TI DIAMOND-LIKE METASTABLE CARBON PHASES FROM SHOCK-COMPRESSED C60 FILMS SO APPLIED PHYSICS LETTERS LA English DT Article AB Thin films of C60, 2.5-mu-m, have been shocked isentropically to 69 GPa, about 2200 K, and thermally quenched at rates up to 10(11) K/s. The recovered specimen is transparent with a crystallographic habit, or "tilelike" structure, but it slowly transforms to a black highly disordered carbon at the ambient condition. The selected area electron diffraction patterns suggest that the transparent carbon phase contains an amorphous cubic diamond and n-diamond crystallites sized 50-350 angstrom in diameter. C1 LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,DEPT PHYS,LIVERMORE,CA 94550. LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550. RP YOO, CS (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,DIV H,LIVERMORE,CA 94550, USA. NR 17 TC 77 Z9 78 U1 0 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 JUL 20 PY 1992 VL 61 IS 3 BP 273 EP 275 DI 10.1063/1.107967 PG 3 WC Physics, Applied SC Physics GA JE524 UT WOS:A1992JE52400011 ER PT J AU GOLDEN, SJ LANGE, FF CLARKE, DR CHANG, LD NECKER, CT AF GOLDEN, SJ LANGE, FF CLARKE, DR CHANG, LD NECKER, CT TI METALORGANIC DEPOSITION OF HIGH CRITICAL CURRENT THIN-FILMS IN THE BI-SR-CA-CU-O SYSTEM ON (100) LAALO3 SUBSTRATES SO APPLIED PHYSICS LETTERS LA English DT Article ID SUPERCONDUCTOR; GROWTH; SRTIO3; BA AB Superconducting thin films of the two Cu-layer phase in the Pb-doped Bi-Sr-Ca-Cu-O system have been fabricated on {100} LaAlO3 single crystals by the metalorganic deposition from ethyl hexanoate precursors. Thin films given heat treatments in air at 850-860-degrees-C had resistive transitions with a T(c) of 86-89 K. The zero-field transport critical current densities were in the range of 2-4 X 10(5) A/cm-2 at 77 K and 10(6) A cm-2 at 45 K in 200-300-nm-thick films. In contrast to c-axis oriented films grown on {100} MgO, x-ray pole figures show that the films grown on {100} LaAlO3 are epitaxial, a result confirmed by electron channeling patterns. C1 UNIV CALIF SANTA BARBARA,DEPT MAT SCI,SANTA BARBARA,CA 93106. UNIV CALIF SANTA BARBARA,DEPT ELECT & COMP ENGN,SANTA BARBARA,CA 93106. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RI Clarke, David/D-2616-2009; Albe, Karsten/F-1139-2011 NR 23 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 20 PY 1992 VL 61 IS 3 BP 351 EP 353 DI 10.1063/1.107934 PG 3 WC Physics, Applied SC Physics GA JE524 UT WOS:A1992JE52400037 ER PT J AU LUO, XC SCHRAMM, DN AF LUO, XC SCHRAMM, DN TI THICK STRINGS, THE LIQUID-CRYSTAL BLUE PHASE, AND COSMOLOGICAL LARGE-SCALE STRUCTURE SO ASTROPHYSICAL JOURNAL LA English DT Article DE HEADINGS, COSMOLOGY, THEORY; GALAXIES, CLUSTERING ID UNIVERSE; EVOLUTION; GALAXIES AB A phenomenological model based on the liquid crystal blue phase is proposed as a model for a late-time cosmological phase transition. Topological defects, in particular thick strings and/or domain walls, are presented as seeds for structure formation. It is shown that the observed large-scale structure, including quasiperiodic wall structure, can be well fitted in the model without violating the microwave background isotropy bound or the limits from induced gravitational waves and the millisecond pulsar timing. Furthermore, such late-time transitions can produce objects such as quasars at high redshifts (z greater than or similar to 5). The model appears to work with either cold or hot dark matter. C1 NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. RP LUO, XC (reprint author), UNIV CHICAGO,5640 S ELLIS AVE,CHICAGO,IL 60637, USA. NR 32 TC 2 Z9 2 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUL 20 PY 1992 VL 394 IS 1 BP 12 EP 18 DI 10.1086/171554 PN 1 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JD343 UT WOS:A1992JD34300003 ER PT J AU BJORKEN, JD AF BJORKEN, JD TI A FULL-ACCEPTANCE DETECTOR FOR SSC PHYSICS AT LOW AND INTERMEDIATE MASS SCALES - AN EXPRESSION OF INTEREST TO THE SSC SO INTERNATIONAL JOURNAL OF MODERN PHYSICS A LA English DT Article RP BJORKEN, JD (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 0 TC 230 Z9 230 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-751X J9 INT J MOD PHYS A JI Int. J. Mod. Phys. A PD JUL 20 PY 1992 VL 7 IS 18 BP 4189 EP 4257 DI 10.1142/S0217751X92001885 PG 69 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA JH223 UT WOS:A1992JH22300001 ER PT J AU FARBER, R LAPEDES, A SIROTKIN, K AF FARBER, R LAPEDES, A SIROTKIN, K TI DETERMINATION OF EUKARYOTIC PROTEIN CODING REGIONS USING NEURAL NETWORKS AND INFORMATION-THEORY SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE CODING REGION; NEURAL NETS; INFORMATION THEORY; EXON; INTRON ID NUCLEIC-ACID SEQUENCES; DNA-SEQUENCES; CODON PREFERENCE C1 NIH,NATL CTR BIOTECHNOL INFORMAT,BETHESDA,MD 20892. RP FARBER, R (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. FU NIGMS NIH HHS [GM 40789-03] NR 14 TC 70 Z9 74 U1 0 U2 3 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD JUL 20 PY 1992 VL 226 IS 2 BP 471 EP 479 DI 10.1016/0022-2836(92)90961-I PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JF966 UT WOS:A1992JF96600017 PM 1640461 ER PT J AU CLANCY, LL RAO, GSJ FINZEL, BC MUCHMORE, SW HOLLAND, DR WATENPAUGH, KD KRISHNAMURTHY, HM SWEET, RM COOK, PF HARRIS, BG EINSPAHR, HM AF CLANCY, LL RAO, GSJ FINZEL, BC MUCHMORE, SW HOLLAND, DR WATENPAUGH, KD KRISHNAMURTHY, HM SWEET, RM COOK, PF HARRIS, BG EINSPAHR, HM TI CRYSTALLIZATION OF THE NAD-DEPENDENT MALIC ENZYME FROM THE PARASITIC NEMATODE ASCARIS-SUUM SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Note DE MALIC ENZYME; CRYSTALLIZATION; NAD-DEPENDENT; ASCARIS-SUUM; PARASITIC NEMATODE ID RATE-DETERMINING STEPS; KINETIC MECHANISM; LIVER; DECARBOXYLATION; PURIFICATION; INACTIVATION; THIOL; PH C1 TEXAS COLL OSTEOPATH MED,DEPT BIOCHEM & MOLEC BIOL,FT WORTH,TX 76107. TEXAS COLL OSTEOPATH MED,DEPT MICROBIOL & IMMUNOL,FT WORTH,TX 76107. PURDUE UNIV,DEPT BIOL SCI,W LAFAYETTE,IN 47906. UNIV OREGON,DEPT CHEM,EUGENE,OR 97402. SMITH KLINE BEECHAM,KING OF PRUSSIA,PA 19406. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RP CLANCY, LL (reprint author), UPJOHN CO,PHYS & ANALYT CHEM RES,KALAMAZOO,MI 49001, USA. OI Finzel, Barry/0000-0001-8761-3384 FU NIAID NIH HHS [AI24155]; NIGMS NIH HHS [GM36799] NR 21 TC 15 Z9 15 U1 0 U2 1 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD JUL 20 PY 1992 VL 226 IS 2 BP 565 EP 569 DI 10.1016/0022-2836(92)90971-L PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JF966 UT WOS:A1992JF96600027 PM 1640469 ER PT J AU CHAPLINE, G AF CHAPLINE, G TI QUANTUM MODEL FOR SPACE-TIME SO MODERN PHYSICS LETTERS A LA English DT Article AB It is suggested that a recently constructed condensate wave function for a three-dimensional anyonic superfluid can be reinterpreted as a coherent state for gravitons. This wave function provides for the first time a mathematical model showing how macroscopic space-time might emerge from microscopic fluctuations in topology, and suggests that the observable universe may be in a nearly pure quantum state. RP CHAPLINE, G (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,POB 808,L-295,LIVERMORE,CA 94550, USA. NR 0 TC 9 Z9 9 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-7323 J9 MOD PHYS LETT A JI Mod. Phys. Lett. A PD JUL 20 PY 1992 VL 7 IS 22 BP 1959 EP 1965 DI 10.1142/S0217732392001671 PG 7 WC Physics, Nuclear; Physics, Particles & Fields; Physics, Mathematical SC Physics GA JG678 UT WOS:A1992JG67800001 ER PT J AU AMELIN, NS CSERNAI, LP STAUBO, EF STROTTMAN, D AF AMELIN, NS CSERNAI, LP STAUBO, EF STROTTMAN, D TI COLLECTIVITY IN ULTRA-RELATIVISTIC HEAVY-ION COLLISIONS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 9TH INTERNATIONAL CONF ON ULTRA-RELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS, QUARK MATTER 91 CY NOV 11-15, 1991 CL GATLINBURG, TN SP US DOE, NATL SCI FDN, UNIV TENNESSEE, DEPT PHYS, UNIV TENNESSEE, SCI ALLIANCE PROGRAM, BICRON, DIGITAL EQUIPMENT, HAMAMATSU, LECROY ID BARYON AB Important basic features of the relativistic Fluid Dynamical Model (FDM) and Monte-Carlo Quark Gluon String Model (QGSM) are compared and discussed. C1 NORDITA,DK-2100 COPENHAGEN,DENMARK. UNIV MINNESOTA,INST THEORET PHYS,MINNEAPOLIS,MN 55455. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP AMELIN, NS (reprint author), UNIV BERGEN,DEPT PHYS,ALLEGT 55,N-5007 BERGEN,NORWAY. NR 4 TC 23 Z9 23 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUL 20 PY 1992 VL 544 IS 1-2 BP C463 EP C466 PG 4 WC Physics, Nuclear SC Physics GA JJ974 UT WOS:A1992JJ97400039 ER PT J AU ANDERSEN, E BARNES, PD BLAES, R BRAUN, H BROM, JM CHERNEY, MD COHLER, M DELACRUZ, B DIEBOLD, GE DUNIN, B ESCOBALES, B FANG, R FERNANDEZ, C FRANKLIN, G GARABATOS, C GARZON, JA GEIST, WM GOMEZ, A GREINER, DE GRUHN, C HAFIDOUNI, M HRUBEC, J JACQUOT, JL JEGHAM, E JONES, PG KUIPERS, JPM LADREM, M DEGUEVARA, PL LIKO, D LOPEZPONTE, S LOVHOIDEN, G MACNAUGHTON, J MICHALON, A MICHALONMENTZER, ME MOSQUERA, J NATKANIEC, Z NELSON, JM NEUHOFER, G OGLE, W DELOSHEROS, CP PLO, M PORTH, P POWELL, B QUINN, B RAMIL, A RIESTER, JL ROHRINGER, H SAKREJDA, I THORSTEINSEN, T TRAXLER, J VOLTOLINI, C YANEZ, A YE, Y ZYBERT, R AF ANDERSEN, E BARNES, PD BLAES, R BRAUN, H BROM, JM CHERNEY, MD COHLER, M DELACRUZ, B DIEBOLD, GE DUNIN, B ESCOBALES, B FANG, R FERNANDEZ, C FRANKLIN, G GARABATOS, C GARZON, JA GEIST, WM GOMEZ, A GREINER, DE GRUHN, C HAFIDOUNI, M HRUBEC, J JACQUOT, JL JEGHAM, E JONES, PG KUIPERS, JPM LADREM, M DEGUEVARA, PL LIKO, D LOPEZPONTE, S LOVHOIDEN, G MACNAUGHTON, J MICHALON, A MICHALONMENTZER, ME MOSQUERA, J NATKANIEC, Z NELSON, JM NEUHOFER, G OGLE, W DELOSHEROS, CP PLO, M PORTH, P POWELL, B QUINN, B RAMIL, A RIESTER, JL ROHRINGER, H SAKREJDA, I THORSTEINSEN, T TRAXLER, J VOLTOLINI, C YANEZ, A YE, Y ZYBERT, R TI RESULTS FROM CERN EXPERIMENT NA36 ON STRANGENESS PRODUCTION SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 9TH INTERNATIONAL CONF ON ULTRA-RELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS, QUARK MATTER 91 CY NOV 11-15, 1991 CL GATLINBURG, TN SP US DOE, NATL SCI FDN, UNIV TENNESSEE, DEPT PHYS, UNIV TENNESSEE, SCI ALLIANCE PROGRAM, BICRON, DIGITAL EQUIPMENT, HAMAMATSU, LECROY ID COLLISIONS; SULFUR AB Measurements of the production of strange particles in the reactions S + Pb and S + S at bearn momentum 200GeV/c per nucleon are presented. A short description of CERN experiment NA36 and the methods of raw data analysis, is followed by physics results concentrating on the dependence of strange particle production on multiplicity. Transverse momentum distributions are also presented. C1 LAWRENCE BERKELEY LAB,1 CYCLOTRON RD,MAILSTOP 50D,BERKELEY,CA 94720. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BIRMINGHAM,DEPT PHYS,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. CERN,EUROPEAN ORG NUCL RES,CH-1211 GENEVA 23,SWITZERLAND. INST PHYS JADROWEJ,PL-30055 KRAKOW 30,POLAND. CIEMAT,DIV FIS PARTICULAS,E-28040 MADRID,SPAIN. CREIGHTON UNIV,DEPT PHYS,OMAHA,NE 68178. CARNEGIE MELLON UNIV,DEPT PHYS,PITTSBURGH,PA 15213. UNIV SANTIAGO,DEPT FIS PARTICULAS,E-15706 SANTIAGO,SPAIN. UNIV LOUIS PASTEUR,INST NATL PHYS NUCL & PHYS PARTICULES,CTR RECH NUCL,CNRS,F-67037 STRASBOURG,FRANCE. INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. UNIV YORK,DEPT PHYS,YORK YO1 5DD,N YORKSHIRE,ENGLAND. RI Gomez Tato, Andres/D-6396-2011; de la Cruz, Begona/K-7552-2014; Yanez, Armando/L-2957-2014; Plo Casasus, Maximo/M-1445-2014; Ramil, Alberto/B-4698-2008 OI Yanez, Armando/0000-0003-4626-7993; Plo Casasus, Maximo/0000-0002-2289-918X; Ramil, Alberto/0000-0002-5333-9425 NR 10 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUL 20 PY 1992 VL 544 IS 1-2 BP C309 EP C320 PG 12 WC Physics, Nuclear SC Physics GA JJ974 UT WOS:A1992JJ97400023 ER PT J AU ATHERTON, H BOGGILD, H BOISSEVAIN, J CHERNEY, M CHESI, E DODD, J DOWNING, J FABJAN, CW FRANZ, A HANSEN, KH HUMANIC, T IKEMOTO, T JACAK, B KALECHOFSKY, H KOBAYASHI, T LEE, YY LELTCHOUK, M LORSTAD, B MIAKE, Y MIYABAYASHI, A MURRAY, M NAGAMIYA, S NISHIMURA, S PANDEY, S PIUZ, F POLYCHRONAKOS, V POULARD, G RAHM, D RIEUBLAND, JM SAKAGUCHI, A SARABURA, M SHIGAKI, K SIMONGILLO, J SONDHEIM, W SUGITATE, T SULLIVAN, J SUMI, Y SLETTEN, H VANHECKE, H WILLIS, W SARABURA, M AF ATHERTON, H BOGGILD, H BOISSEVAIN, J CHERNEY, M CHESI, E DODD, J DOWNING, J FABJAN, CW FRANZ, A HANSEN, KH HUMANIC, T IKEMOTO, T JACAK, B KALECHOFSKY, H KOBAYASHI, T LEE, YY LELTCHOUK, M LORSTAD, B MIAKE, Y MIYABAYASHI, A MURRAY, M NAGAMIYA, S NISHIMURA, S PANDEY, S PIUZ, F POLYCHRONAKOS, V POULARD, G RAHM, D RIEUBLAND, JM SAKAGUCHI, A SARABURA, M SHIGAKI, K SIMONGILLO, J SONDHEIM, W SUGITATE, T SULLIVAN, J SUMI, Y SLETTEN, H VANHECKE, H WILLIS, W SARABURA, M TI RESULTS FROM CERN EXPERIMENT NA44 SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 9TH INTERNATIONAL CONF ON ULTRA-RELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS, QUARK MATTER 91 CY NOV 11-15, 1991 CL GATLINBURG, TN SP US DOE, NATL SCI FDN, UNIV TENNESSEE, DEPT PHYS, UNIV TENNESSEE, SCI ALLIANCE PROGRAM, BICRON, DIGITAL EQUIPMENT, HAMAMATSU, LECROY ID NUCLEAR COLLISIONS; INTERFEROMETRY AB A preliminary analysis is presented, of proton-nucleus collisions at projectile energy 450 GeV and sulphur-lead interactions at projectile energy 200 A.GeV. The focussing spectrometer is designed to measure single and double-particle cross sections with high statistics, at central and forward rapidities. Inclusive spectra for pi+/-, K+/-, p and pBAR emitted from p + Be, p + Pb, S + S, and S + Pb collisions are presented, as well as the two-particle correlation function for minimum bias S + Pb --> 2-pi+ + X collisions. C1 CERN,CH-1211 GENEVA 23,SWITZERLAND. COLUMBIA UNIV,NEW YORK,NY 10027. CREIGHTON UNIV,OMAHA,NE 68178. HIROSHIMA UNIV,HIROSHIMA 730,JAPAN. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV LUND,S-22362 LUND,SWEDEN. NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. NIELS BOHR INST,DK-2100 COPENHAGEN,DENMARK. UNIV PITTSBURGH,PITTSBURGH,PA 15260. UNIV TOKYO,TOKYO 113,JAPAN. UNIV TSUKUBA,TSUKUBA 305,JAPAN. RP ATHERTON, H (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 16 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUL 20 PY 1992 VL 544 IS 1-2 BP C125 EP C136 PG 12 WC Physics, Nuclear SC Physics GA JJ974 UT WOS:A1992JJ97400010 ER PT J AU BLOOMER, MA JACOBS, P ALBRECHT, R AWES, TC BECKMANN, P BERGER, F BOCK, D BOCK, R CLAESSON, G CLEWING, G DEBBE, R DRAGON, L EKLUND, A FERGUSON, RL FOKIN, S FRANZ, A GARPMAN, S GLASOW, R GUSTAFSSON, HA GUTBROD, HH HANSEN, O HARTIG, M HOLKER, G IDH, J IPPOLITOV, M KAMPERT, KH KARADJEV, K KOLB, BW LEBEDEV, A LOHNER, H LUND, I MANKO, V MOSKOWITZ, B OBENSHAIN, FE OSKARSSON, A OTTERLUND, I PEITZMANN, T PLASIL, F POSKANZER, AM PURSCHKE, M RITTER, HG ROTERS, B SAINI, S SANTO, R SCHMIDT, HR SODERSTROM, K SORENSEN, SP STEFFENS, K STEINHAUSER, P STENLUND, E STUKEN, D TWYHUES, A VINOGRADOV, A YOUNG, GR AF BLOOMER, MA JACOBS, P ALBRECHT, R AWES, TC BECKMANN, P BERGER, F BOCK, D BOCK, R CLAESSON, G CLEWING, G DEBBE, R DRAGON, L EKLUND, A FERGUSON, RL FOKIN, S FRANZ, A GARPMAN, S GLASOW, R GUSTAFSSON, HA GUTBROD, HH HANSEN, O HARTIG, M HOLKER, G IDH, J IPPOLITOV, M KAMPERT, KH KARADJEV, K KOLB, BW LEBEDEV, A LOHNER, H LUND, I MANKO, V MOSKOWITZ, B OBENSHAIN, FE OSKARSSON, A OTTERLUND, I PEITZMANN, T PLASIL, F POSKANZER, AM PURSCHKE, M RITTER, HG ROTERS, B SAINI, S SANTO, R SCHMIDT, HR SODERSTROM, K SORENSEN, SP STEFFENS, K STEINHAUSER, P STENLUND, E STUKEN, D TWYHUES, A VINOGRADOV, A YOUNG, GR TI INTERMITTENCY IN S-32+S AND S-32+AU COLLISIONS AT THE CERN SPS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 9TH INTERNATIONAL CONF ON ULTRA-RELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS, QUARK MATTER 91 CY NOV 11-15, 1991 CL GATLINBURG, TN SP US DOE, NATL SCI FDN, UNIV TENNESSEE, DEPT PHYS, UNIV TENNESSEE, SCI ALLIANCE PROGRAM, BICRON, DIGITAL EQUIPMENT, HAMAMATSU, LECROY ID HIGH-ENERGY COLLISIONS; FLUCTUATIONS; PATTERNS AB Nonstatistical or "intermittent" fluctuations of charged particle multiplicities have been investigated at the CERN SPS with the WA80 multiplicity array for S-32+S and S-32+Au collisions of varying centrality. Within the phase space domain studied there is no evidence for intermittency in these collisions beyond that accounted for by FRITIOF filtered through a full detector simulation. C1 GESELL SCHWERIONENFORSCH GMBH,W-6100 DARMSTADT,GERMANY. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV GRONINGEN,KVI,9747 AA GRONINGEN,NETHERLANDS. UNIV MUNSTER,W-4400 MUNSTER,GERMANY. UNIV LUND,S-22362 LUND,SWEDEN. BROOKHAVEN NATL LAB,UPTON,NY 11973. KURCHATOV INST,MOSCOW 123182,USSR. UNIV TENNESSEE,KNOXVILLE,TN 37996. RP BLOOMER, MA (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Peitzmann, Thomas/K-2206-2012; Lohner, Herbert/B-2397-2014 OI Peitzmann, Thomas/0000-0002-7116-899X; Lohner, Herbert/0000-0002-7441-739X NR 11 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUL 20 PY 1992 VL 544 IS 1-2 BP C543 EP C546 PG 4 WC Physics, Nuclear SC Physics GA JJ974 UT WOS:A1992JJ97400056 ER PT J AU BOTTCHER, C STRAYER, MR AF BOTTCHER, C STRAYER, MR TI ELECTROMAGNETIC PAIR PRODUCTION IN RELATIVISTIC HEAVY-ION COLLISIONS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 9TH INTERNATIONAL CONF ON ULTRA-RELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS, QUARK MATTER 91 CY NOV 11-15, 1991 CL GATLINBURG, TN SP US DOE, NATL SCI FDN, UNIV TENNESSEE, DEPT PHYS, UNIV TENNESSEE, SCI ALLIANCE PROGRAM, BICRON, DIGITAL EQUIPMENT, HAMAMATSU, LECROY ID HIGGS-BOSON AB We survey the phenomenon of pair production by the transient electromagnetic fields produced in relativistic heavy-ion collisions, as it impinges upon atomic, nuclear, and particle physics, and the design of accelerators and detectors. The subject is naturally divided between coherent production in peripheral collisions, and incoherent production in central collisions. We discuss examples illustrating both regimes. RP BOTTCHER, C (reprint author), OAK RIDGE NATL LAB,DIV PHYS,CTR COMPUTATIONALLY INTENS PHYS,OAK RIDGE,TN 37831, USA. NR 21 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUL 20 PY 1992 VL 544 IS 1-2 BP C255 EP C265 PG 11 WC Physics, Nuclear SC Physics GA JJ974 UT WOS:A1992JJ97400019 ER PT J AU BRAUNMUNZINGER, P BARRETTE, J BELLWIED, R BRAUNMUNZINGER, P CLELAND, WE CORMIER, TM DAVID, G DEE, J DIEBOLD, GE DIETZSCH, O FATYGA, M FOX, D GERMANI, JV GHALAMBORDEZFULI, M GILBERT, S GREENE, SV HALL, JR HEMMICK, TK HERRMANN, N HONG, B INGOLD, G JAYANANDA, K KRAUS, D KUMAR, BS LACASSE, R LISSAUER, D LLOPE, WJ LUDLAM, TW MCCORKLE, S MAJKA, R MARK, SK MITCHELL, JT MUTHUSWAMY, M OBRIEN, E POLYCHRONAKOS, V PRUNEAU, C ROTONDO, F SANDWEISS, J DASILVA, NC SIMONGILLO, J SONNADARA, U STACHEL, J TAKAI, H TAKAGUI, EM THROWE, TG WINTER, C WANG, G WATERS, L WOLF, K WOLFE, D WOODY, CL XU, N ZHANG, Y ZHANG, Z ZOU, C AF BRAUNMUNZINGER, P BARRETTE, J BELLWIED, R BRAUNMUNZINGER, P CLELAND, WE CORMIER, TM DAVID, G DEE, J DIEBOLD, GE DIETZSCH, O FATYGA, M FOX, D GERMANI, JV GHALAMBORDEZFULI, M GILBERT, S GREENE, SV HALL, JR HEMMICK, TK HERRMANN, N HONG, B INGOLD, G JAYANANDA, K KRAUS, D KUMAR, BS LACASSE, R LISSAUER, D LLOPE, WJ LUDLAM, TW MCCORKLE, S MAJKA, R MARK, SK MITCHELL, JT MUTHUSWAMY, M OBRIEN, E POLYCHRONAKOS, V PRUNEAU, C ROTONDO, F SANDWEISS, J DASILVA, NC SIMONGILLO, J SONNADARA, U STACHEL, J TAKAI, H TAKAGUI, EM THROWE, TG WINTER, C WANG, G WATERS, L WOLF, K WOLFE, D WOODY, CL XU, N ZHANG, Y ZHANG, Z ZOU, C TI RECENT RESULTS FROM EXPERIMENT 814 AT BROOKHAVEN SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 9TH INTERNATIONAL CONF ON ULTRA-RELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS, QUARK MATTER 91 CY NOV 11-15, 1991 CL GATLINBURG, TN SP US DOE, NATL SCI FDN, UNIV TENNESSEE, DEPT PHYS, UNIV TENNESSEE, SCI ALLIANCE PROGRAM, BICRON, DIGITAL EQUIPMENT, HAMAMATSU, LECROY ID HEAVY-ION COLLISIONS; GEV/C AB Recent results from the E814 collaboration are presented for reactions of 14.6 GeV/nucleon Si-28 projectiles with targets of Al, Cu, and Pb. This includes transverse energy distributions over the full solid angle and the distribution of charged particle multiplicity in the forward hemisphere. Furthermore we present recent results on transverse momentum spectra and rapidity distributions for protons and discuss them in terms of stopping and/or transparency. A fraction of nucleons emerges at beam rapidity, even for the most central collisions. These 'punch-through' distributions are shown to yield information on the in-medium nucleon-nucleon cross section. Finally, we discuss antiproton production at 0-degrees as a function of event centrality to shed some light on possible reabsorption. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. MCGILL UNIV,MONTREAL H3A 2T5,QUEBEC,CANADA. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. UNIV PITTSBURGH,PITTSBURGH,PA 15260. SUNY STONY BROOK,STONY BROOK,NY 11794. UNIV SAO PAULO,SAO PAULO,BRAZIL. TEXAS A&M UNIV SYST,COLL STN,TX 77843. WAYNE STATE UNIV,DETROIT,MI 48202. YALE UNIV,NEW HAVEN,CT 06511. RP BRAUNMUNZINGER, P (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Takai, Helio/C-3301-2012 OI Takai, Helio/0000-0001-9253-8307 NR 20 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUL 20 PY 1992 VL 544 IS 1-2 BP C137 EP C152 PG 16 WC Physics, Nuclear SC Physics GA JJ974 UT WOS:A1992JJ97400011 ER PT J AU BRODSKY, SJ AF BRODSKY, SJ TI NOVEL QCD EFFECTS IN NUCLEAR COLLISIONS SO NUCLEAR PHYSICS A LA English DT Article ID YAN CROSS-SECTION; QUANTUM CHROMODYNAMICS; COLOR TRANSPARENCY; DIMUON PRODUCTION; J/PSI-PRODUCTION; 125-GEV/C ANTIPROTON; HADRONIC SCATTERING; PI(-) INTERACTIONS; POWER CORRECTIONS; INTRINSIC CHARM AB Heavy ion collisions can provide a novel environment for testing fundamental dynamical processes in QCD, including minijet formation and interactions, formation zone phenomena, color filtering, coherent co-mover interactions, and new higher twist mechanisms which could account for the observed excess production and anomalous nuclear target dependence of heavy flavor production. The possibility of using light-cone thermodynamics and a corresponding covariant temperature to describe the QCD phases of the nuclear fragmentation region is also briefly discussed. RP STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. NR 78 TC 3 Z9 3 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 JUL 20 PY 1992 VL 544 IS 1-2 BP C223 EP C236 PG 14 WC Physics, Nuclear SC Physics GA JJ974 UT WOS:A1992JJ97400017 ER PT J AU CHAPMAN, S AF CHAPMAN, S TI NUCLEAR TRANSPARENCY IN 15 AGEV SI+AU REACTIONS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 9TH INTERNATIONAL CONF ON ULTRA-RELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS, QUARK MATTER 91 CY NOV 11-15, 1991 CL GATLINBURG, TN SP US DOE, NATL SCI FDN, UNIV TENNESSEE, DEPT PHYS, UNIV TENNESSEE, SCI ALLIANCE PROGRAM, BICRON, DIGITAL EQUIPMENT, HAMAMATSU, LECROY ID HEAVY-ION COLLISIONS; KAON PRODUCTION; HIGH-ENERGY; FLOW; DISTRIBUTIONS; MATTER; GEV/C; MODEL AB Fireball, firestreak and hadronic string models are shown to overpredict recent central 15 AGeV Si + Au E802 spectrometer data by at least 70%. Claims in the literature about full nuclear stopping in Si + Au reactions are therefore premature. In fact, fits to the spectrometer data indicate that up to half of the projectile nucleons may lose less than one unit of rapidity after traversing 5-10 fm of nuclear matter, implying possibly a surprisingly tong stopping length of approximately 20 fm. Comparison of these same fits with E810, E814, and preliminary E802 dN(charged)/d-eta data suggests, however, that there may be some inconsistencies among the various data sets, and therefore that additional data will be needed to establish the degree of nuclear stopping at AGS energies. RP CHAPMAN, S (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 27 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUL 20 PY 1992 VL 544 IS 1-2 BP C429 EP C434 PG 6 WC Physics, Nuclear SC Physics GA JJ974 UT WOS:A1992JJ97400032 ER PT J AU COSTALES, JB AKIBA, Y BEAVIS, D BEERY, P BRITT, HC BUDICK, B CHASMAN, C CHEN, Z CHI, CY CHU, YY CIANCIOLO, V COLE, BA COSTALES, JB CRAWFORD, HJ CUMMING, JB DEBBE, R ENGELAGE, J FUNG, SY GONIN, M GUSHUE, S HAMAGAKI, H HANSEN, O HAYANO, RS HAYASHI, S HOMMA, S HUANG, H KANEKO, H KANG, J KAUFMAN, S KEHOE, W KURITA, K LEDOUX, RJ LEVINE, MJ MIAKE, Y MORRISON, D MORSE, RJ MOSKOWITZ, B NAGAMIYA, S NAMBOODIRI, MN NAYAK, T OLNESS, J PARSONS, CG REMSBERG, LP ROEHRICH, D ROTHSCHILD, P SAKURAI, H SANGSTER, TC SETO, R SOLTZ, R STEADMAN, SG STEPHANS, GSF SUNG, T TANAKA, S TANAKA, Y TANNENBAUM, MJ THOMAS, J VANDIJK, JH VIDEBAEK, F VOSSNACK, O VUTSADAKIS, V WANG, FQ WANG, Y WEGNER, HE WOODRUFF, DS WU, YD ZAJC, W AF COSTALES, JB AKIBA, Y BEAVIS, D BEERY, P BRITT, HC BUDICK, B CHASMAN, C CHEN, Z CHI, CY CHU, YY CIANCIOLO, V COLE, BA COSTALES, JB CRAWFORD, HJ CUMMING, JB DEBBE, R ENGELAGE, J FUNG, SY GONIN, M GUSHUE, S HAMAGAKI, H HANSEN, O HAYANO, RS HAYASHI, S HOMMA, S HUANG, H KANEKO, H KANG, J KAUFMAN, S KEHOE, W KURITA, K LEDOUX, RJ LEVINE, MJ MIAKE, Y MORRISON, D MORSE, RJ MOSKOWITZ, B NAGAMIYA, S NAMBOODIRI, MN NAYAK, T OLNESS, J PARSONS, CG REMSBERG, LP ROEHRICH, D ROTHSCHILD, P SAKURAI, H SANGSTER, TC SETO, R SOLTZ, R STEADMAN, SG STEPHANS, GSF SUNG, T TANAKA, S TANAKA, Y TANNENBAUM, MJ THOMAS, J VANDIJK, JH VIDEBAEK, F VOSSNACK, O VUTSADAKIS, V WANG, FQ WANG, Y WEGNER, HE WOODRUFF, DS WU, YD ZAJC, W TI TARGET RAPIDITY PROTON DISTRIBUTIONS FOR SI+A COLLISIONS AT THE AGS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 9TH INTERNATIONAL CONF ON ULTRA-RELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS, QUARK MATTER 91 CY NOV 11-15, 1991 CL GATLINBURG, TN SP US DOE, NATL SCI FDN, UNIV TENNESSEE, DEPT PHYS, UNIV TENNESSEE, SCI ALLIANCE PROGRAM, BICRON, DIGITAL EQUIPMENT, HAMAMATSU, LECROY ID ENERGY AB Preliminary results are presented for the production of protons in 14.6 A.GeV/c Si + Al and Si + Au collisions measured by the E859 Phoswich Array at the BNL AGS. The proton data presented cover the laboratory angles of 50-130 degrees and kinetic energies of 40-180 MeV. Slopes and integrated distributions are extracted and comparisons with other experimental data are discussed. C1 UNIV TOKYO,DEPT PHYS,TOKYO 113,JAPAN. BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV CALIF BERKELEY,PROTOZOOL LAB,BERKELEY,CA 94720. UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521. COLUMBIA UNIV,NEW YORK,NY 10027. NEVIS LABS,IRVINGTON,NY 10533. UNIV TOKYO,INST NUCL STUDY,TANASHI,TOKYO 188,JAPAN. KYOTO UNIV,SAKYO KU,KYOTO 606,JAPAN. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. NYU,NEW YORK,NY 10003. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. RP COSTALES, JB (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI Cumming, James/I-3358-2013; SAKURAI, HIROYOSHI/G-5085-2014; Hayano, Ryugo/F-7889-2012; HAMAGAKI, HIDEKI/G-4899-2014 OI Cumming, James/0000-0001-6930-0958; Hayano, Ryugo/0000-0002-1214-7806; NR 6 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUL 20 PY 1992 VL 544 IS 1-2 BP C445 EP C448 PG 4 WC Physics, Nuclear SC Physics GA JJ974 UT WOS:A1992JJ97400035 ER EF