FN Thomson Reuters Web of Science™ VR 1.0 PT J AU MCGREGOR, DA YEUNG, ES AF MCGREGOR, DA YEUNG, ES TI DETECTION OF DNA FRAGMENTS SEPARATED BY CAPILLARY ELECTROPHORESIS BASED ON THEIR NATIVE FLUORESCENCE INSIDE A SHEATH FLOW SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article; Proceedings Paper CT 6th International Symposium on High Performance Capillary Electrophoresis (HPCE 94) CY JAN 31-FEB 03, 1994 CL SAN DIEGO, CA ID LASER-INDUCED FLUORESCENCE; GEL-ELECTROPHORESIS; RESTRICTION FRAGMENTS; ZONE ELECTROPHORESIS AB A scheme for the separation and detection of native DNA fragments in capillary electrophoresis is presented. A UV laser at 275 nm excites the intrinsic fluorescence of the fragments, which is greatly enhanced at pH 2.8. To provide a compatible system, methylcellulose-based size separation is performed at the identical pH. A sheath-flow arrangement isolates the detection region from the linear polymer for a reduced background level. The performance is an order-of-magnitude enhancement in detectability over absorption detection. We also uncovered a selective degradation/ligation process at these pH conditions that may be useful as additional selectivity for DNA characterization. C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 24 TC 29 Z9 30 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD OCT 7 PY 1994 VL 680 IS 2 BP 491 EP 496 DI 10.1016/0021-9673(94)85147-6 PG 6 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA PM250 UT WOS:A1994PM25000017 ER PT J AU ROBINS, WH WRIGHT, BW AF ROBINS, WH WRIGHT, BW TI CAPILLARY ELECTROPHORETIC SEPARATION OF ORGANOPHOSPHONIC ACIDS USING BORATE ESTERIFICATION AND DIRECT UV DETECTION SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article; Proceedings Paper CT 6th International Symposium on High Performance Capillary Electrophoresis (HPCE 94) CY JAN 31-FEB 03, 1994 CL SAN DIEGO, CA ID PERFORMANCE LIQUID-CHROMATOGRAPHY; ANION-EXCHANGE CHROMATOGRAPHY; ZONE ELECTROPHORESIS; ELECTROCHEMICAL DETECTION; CONDUCTOMETRIC DETECTION; ELUTION CHARACTERISTICS; METHYLPHOSPHONIC ACIDS; COMPLEX-FORMATION; ION; ELUENTS AB One major challenge in the analysis of small ions by capillary zone electrophoresis (CZE) is detection. The most common commercially available detector for CZE is based on UV absorbance. For many small molecules, however, little UV absorbance occurs above 210 nm, limiting the usefulness of this detection method. Carbohydrates, alcohols and amides have been separated and directly detected by complexation with sodium borate. It has been shown that these complexes have UV absorbances in the range of 220 to 280 nm, whereas the analytes alone are UV transparent at energies less than 200 nm. Separation and direct detection of organophosphonic acids using sodium borate as both a buffer and derivatization agent is demonstrated. Detection limits on the order of nanograms are reported with separations that exhibit 10 000 to 1 740 000 theoretical plates. The ultraviolet, infrared, nuclear magnetic resonance and mass spectra of various borate/phosphonic acid esters are explored. RP ROBINS, WH (reprint author), PACIFIC NW LAB, DEPT CHEM SCI, POB 999, RICHLAND, WA 99352 USA. NR 35 TC 21 Z9 21 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD OCT 7 PY 1994 VL 680 IS 2 BP 667 EP 673 DI 10.1016/0021-9673(94)85167-0 PG 7 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA PM250 UT WOS:A1994PM25000037 ER PT J AU TOTTER, JR AF TOTTER, JR TI BETA-CAROTENE AND THE PREVENTION OF CANCER SO SCIENCE LA English DT Letter RP TOTTER, JR (reprint author), OAK RIDGE ASSOCIATED UNIV,POB 117,OAK RIDGE,TN 37831, USA. NR 2 TC 1 Z9 1 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 OCT 7 PY 1994 VL 266 IS 5182 BP 15 EP 16 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PK582 UT WOS:A1994PK58200005 PM 7939635 ER PT J AU MCGIBBON, MM BROWNING, ND CHISHOLM, MF MCGIBBON, AJ PENNYCOOK, SJ RAVIKUMAR, V DRAVID, VP AF MCGIBBON, MM BROWNING, ND CHISHOLM, MF MCGIBBON, AJ PENNYCOOK, SJ RAVIKUMAR, V DRAVID, VP TI DIRECT DETERMINATION OF GRAIN-BOUNDARY ATOMIC-STRUCTURE IN SRTIO3 SO SCIENCE LA English DT Article ID ENERGY-LOSS SPECTROSCOPY; TRANSITION-METAL OXIDES; ELECTRICAL-PROPERTIES; CRYSTAL-STRUCTURE; RESOLUTION; MICROSCOPY; STATES AB An atomic structure model for a 25 degrees [001] symmetric tilt grain boundary in SrTiO3 has been determined directly from experimental data with the use of high-resolution Z-contrast imaging coupled with electron energy loss spectroscopy. The derived model of the grain boundary was refined by bond-valence sum calculations and reveals candidate sites for dopant atoms in the boundary plane. These results show how the combined techniques can be used to deduce the atomic structure of defects and interfaces without recourse to preconceived structural models or image simulations. C1 NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208. RP MCGIBBON, MM (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI Dravid, Vinayak/B-6688-2009; OI Browning, Nigel/0000-0003-0491-251X NR 28 TC 145 Z9 146 U1 5 U2 46 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD OCT 7 PY 1994 VL 266 IS 5182 BP 102 EP 104 DI 10.1126/science.266.5182.102 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PK582 UT WOS:A1994PK58200032 PM 17814005 ER PT J AU BLANK, ML SMITH, ZL CRESS, EA SNYDER, F AF BLANK, ML SMITH, ZL CRESS, EA SNYDER, F TI MOLECULAR-SPECIES OF ETHANOLAMINE PLASMALOGENS AND TRANSACYLASE ACTIVITY IN RAT-TISSUES ARE ALTERED BY FISH-OIL DIETS SO BIOCHIMICA ET BIOPHYSICA ACTA-LIPIDS AND LIPID METABOLISM LA English DT Article DE ARACHIDONIC ACID; DOCOSAHEXAENOIC ACID; DOCOSAPENTAENOIC ACID; ICOSANOID; ICOSAPENTAENOIC ACID; FISH OIL; GLYCERYL ETHER; NUTRITION; (N-3) FATTY ACID; PLASMALOGEN; PLATELET-ACTIVATING FACTOR; TRANSACYLASE ID PLATELET-ACTIVATING-FACTOR; UNSATURATED FATTY-ACIDS; ALVEOLAR MACROPHAGES; HUMAN-NEUTROPHILS; FACTOR PAF; ACYLATION; CELLS; BIOSYNTHESIS; GLYCEROPHOSPHOLIPIDS; PHOSPHOLIPASE-A2 AB Effects of dietary fish oil ethyl esters and alkyldiacetylglycerols (an ether-linked lipid) on the distribution of subclasses of choline- and ethanolamine-glycerophospholipids as well as effects on highly unsaturated molecular species of ethanolamine plasmalogens from brain, spleen, kidney, lung, and testis of rats were examined. Supplementation of ethyl ester concentrates of n - 3 fatty acids had no effect on the distribution of subclasses in any of the tissues. However, the supplements of 1-O-octadec-9'-enyl-2,3-diacetyl-sn-glycerol (diacetates of selachyl alcohol) caused significant increases in the alkylacylglyceraphosphocholine and alkylacylglycerophosphoethanolamine subclasses from spleen and lung and in the alkylacylglycerophosphoethanolamine subclass from kidney. Dietary supplements of fish oil ethyl esters reduced the arachidonate-containing species of ethanolamine plasmalogens whereas molecular species having 20:5(n - 3), 22:6(n - 3), and/or 22:5(n - 3) acyl groups were increased in the spleen, lung, and kidneys, but not brain. In testicular tissue from rats fed the fish oil diets, the molecular species of ethanolamine plasmalogens containing 22:5(n - 6) acyl groups were reduced. An increase of ethanolamine plasmalogens with 18:1 alk-1-enyl moieties paired with highly unsaturated sn-2 acyl groups were found in the tissues of rats fed the fish oil plus selachyl alcohol diacetate supplements. Rats on the diet containing fish oil ethyl esters had significantly lower [H-3]alkyllysoglycerophosphocholine CoA-independent transacylase activity in spleen microsomes than controls. This suggests that supplements of n - 3 fatty acids interferes with the transacylation of arachidonate, an event that could seriously impair the release of arachidonate and lysophospholipids (e.g., lyso-PAF) that are precursors of potent bioactive lipid derivatives. C1 OAK RIDGE ASSOCIATED UNIV, OAK RIDGE INST SCI & EDUC, DIV MED SCI, OAK RIDGE, TN 37831 USA. FU NHLBI NIH HHS [HL35495-07A1, HL27109-13A1]; NIDDK NIH HHS [R01 DK42804-03A1] NR 32 TC 16 Z9 18 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0005-2760 J9 BBA-LIPID LIPID MET JI Biochim. Biophys. Acta-Lipids Lipid Metab. PD OCT 6 PY 1994 VL 1214 IS 3 BP 295 EP 302 DI 10.1016/0005-2760(94)90076-0 PG 8 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA PM284 UT WOS:A1994PM28400010 PM 7918612 ER PT J AU MONKS, PS STIEF, LJ KRAUSS, M KUO, SC ZHANG, Z KLEMM, RB AF MONKS, PS STIEF, LJ KRAUSS, M KUO, SC ZHANG, Z KLEMM, RB TI A DISCHARGE FLOW-PHOTOIONIZATION MASS-SPECTROMETRIC STUDY OF THE NO3((2)A(2)') RADICAL - PHOTOIONIZATION SPECTRUM, ADIABATIC IONIZATION-ENERGY, AND GROUND-STATE SYMMETRY SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID NO3; SPECTROSCOPY; NITRATE; ION AB The photoion efficiency spectrum of the nitrate radical (NO3) was measured over the region lambda = 90-104 nm by using a discharge flow-photoionization mass spectrometer apparatus coupled to a synchrotron radiation source. NO3 was generated by the reaction of fluorine atoms with nitric acid. A value of 12.57 +/- 0.03 eV was obtained for the adiabatic ionization energy (IE) of NO3 from photoion thresholds, corresponding to the NO3+((1)A(1)') <-- NO3((2)A(2)') transition. These direct ionization measurements are the first to be reported for the NO3 radical. Relative energetics and optimized geometries for ground state NO3 and several states of NO3+ were determined in both D-3h and C-2V symmetries using multiconfiguration self-consistent-field calculations. The results of the present study strongly suggest that the neutral ground state of NO3 has D-3h symmetry. This conclusion is based on the following observations: (1) the experimental photoion threshold exhibits a large, steep initial step with no evidence of significant structure, indicating that the neutral and cation must share the same symmetry, and (2) the theoretical evidence is unambiguous that the cation symmetry is D-3h A value of Delta(f)H(298)degrees(NO3+) and the proton affinity of NO3 are also derived. A brief comparison is made of the ionization energies of NO, NO2, and NO3, and some new results on the dissociative ionization of HNO3 are discussed. C1 NASA,GODDARD SPACE FLIGHT CTR,EXTRATERR PHYS LAB,GREENBELT,MD 20771. CTR ADV RES BIOTECHNOL,ROCKVILLE,MD 20850. BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. RI Monks, Paul/H-6468-2016 OI Monks, Paul/0000-0001-9984-4390 NR 31 TC 24 Z9 25 U1 1 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 OCT 6 PY 1994 VL 98 IS 40 BP 10017 EP 10022 DI 10.1021/j100091a013 PG 6 WC Chemistry, Physical SC Chemistry GA PK740 UT WOS:A1994PK74000013 ER PT J AU HO, P COLTRIN, ME BREILAND, WG AF HO, P COLTRIN, ME BREILAND, WG TI LASER-INDUCED FLUORESCENCE MEASUREMENTS AND KINETIC-ANALYSIS OF SI ATOM FORMATION IN A ROTATING-DISK CHEMICAL-VAPOR-DEPOSITION REACTOR SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID MATHEMATICAL-MODEL; ARRHENIUS PARAMETERS; FLUID-MECHANICS; HEAT-TRANSFER; SILICON; SILANE; PHASE; CHEMISTRY; PYROLYSIS; DISILANE AB An extensive set of laser-induced fluorescence (LIF) measurements of Si atoms during the chemical vapor deposition (CVD) of silicon from silane and disilane in a research rotating disk reactor are presented. The experimental results are compared in detail with predictions from a numerical model of CVD from silane and disilane that treats the fluid flow coupled to gas-phase and gas-surface chemistry, The comparisons showed that the unimolecular decomposition of SiH2 could not account for the observed gas-phase Si atom density profiles. The H3SiSiH <-> Si + SiH4 and H3SiSiH + SiH2 <-> Si + Si2H6 reactions are proposed as the primary Si atom production routes. The model is in good agreement with the measured shapes of the Si atom profiles and the trends in Si atom density with susceptor temperature, pressure, and reactant gas mixture. RP HO, P (reprint author), SANDIA NATL LABS,POB 5800,MS 0601,ALBUQUERQUE,NM 87185, USA. NR 32 TC 102 Z9 102 U1 3 U2 11 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 OCT 6 PY 1994 VL 98 IS 40 BP 10138 EP 10147 DI 10.1021/j100091a032 PG 10 WC Chemistry, Physical SC Chemistry GA PK740 UT WOS:A1994PK74000032 ER PT J AU KRITZENBERGER, J GAEDE, HC SHORE, JS PINES, A BELL, AT AF KRITZENBERGER, J GAEDE, HC SHORE, JS PINES, A BELL, AT TI XE-129 NMR-STUDY OF TIO2 (ANATASE)-SUPPORTED V2O5 CATALYSTS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; Y-ZEOLITES; CHEMICAL-SHIFT; PHTHALIC-ANHYDRIDE; VANADIUM PENTOXIDE; DENSITY DEPENDENCE; XYLENE OXIDATION; ADSORBED XENON; LASER RAMAN; NAY ZEOLITE AB TiO2 (anatase), V2O5, and V2O5/TiO2 (anatase) catalysts with 1.3%, 3.0%, and 9.8% weight loadings of V2O5 have been studied using temperature-dependent xenon-129 NMR spectroscopy. The intrinsic chemical shift values due to the interaction of xenon with the surface are 109 +/- 3 ppm for TiO2 (anatase) and 93 +/- 5 ppm for V2O5. The V2O5/TiO2 catalysts provide strong adsorption sites for xenon which cause an initial decrease of the chemical shift values at low xenon loadings. Additionally, the spectra of pure V2O5 reveal two distinct environments for the xenon atoms, consistent with the hysteresis of the isotherm and the existence of pores. Two-dimensional exchange spectroscopy was used to measure the rates and activation energy of xenon moving between these two environments. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV SCI MAT, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV CHEM SCI, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT CHEM ENGN, BERKELEY, CA 94720 USA. RI Gaede, Holly/B-7392-2015 OI Gaede, Holly/0000-0003-4444-4394 NR 61 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 OCT 6 PY 1994 VL 98 IS 40 BP 10173 EP 10179 DI 10.1021/j100091a037 PG 7 WC Chemistry, Physical SC Chemistry GA PK740 UT WOS:A1994PK74000037 ER PT J AU WERST, DW TARTAKOVSKY, EE PIOCOS, EA TRIFUNAC, AD AF WERST, DW TARTAKOVSKY, EE PIOCOS, EA TRIFUNAC, AD TI ISOMERIZATION OF OLEFIN RADICAL CATIONS IN ZSM-5 ZEOLITES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ELECTRON-SPIN-RESONANCE; DETECTED MAGNETIC-RESONANCE; ION MOLECULE REACTIONS; H-MORDENITE; SYNTHETIC ZEOLITES; ATOMIC-HYDROGEN; ADSORPTION; TEMPERATURE; TIME; SILICA AB Variable-temperature EPR was used to investigate reactions of olefin radical cations generated radiolytically in nonacidic and acidic ZSM-5 zeolites. The olefin radical cations undergo isomerization reactions even at 4 K. Radical cation reactions are presumably driven by the exothermicity of charge transfer, which is not efficiently quenched by the vibrational modes of the zeolite lattice. The observation of H-addition type radicals indicates Bronsted acid-catalyzed rearrangements prior to irradiation on the more acidic zeolites. RP ARGONNE NATL LAB, DIV CHEM, 9700 S CASS AVE, ARGONNE, IL 60439 USA. NR 80 TC 32 Z9 32 U1 0 U2 2 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 OCT 6 PY 1994 VL 98 IS 40 BP 10249 EP 10257 DI 10.1021/j100091a047 PG 9 WC Chemistry, Physical SC Chemistry GA PK740 UT WOS:A1994PK74000047 ER PT J AU KIM, SH TRYK, DA ANTONIO, MR CARR, R SCHERSON, D AF KIM, SH TRYK, DA ANTONIO, MR CARR, R SCHERSON, D TI IN-SITU X-RAY-ABSORPTION FINE-STRUCTURE STUDIES OF FOREIGN METAL-IONS IN NICKEL HYDROUS OXIDE ELECTRODES IN ALKALINE ELECTROLYTES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID OXYGEN EVOLUTION REACTION; NEUTRON-DIFFRACTION; IRON; SPECTROSCOPY; HYDROXIDE; EXAFS; MOSSBAUER AB Aspects of the structural and electronic properties of hydrous oxide films of Ni and of composite (9:1) Ni/Co and (9:1) Ni/Fe, prepared by electrodeposition, have been examined in alkaline electrolytes using in situ X-ray absorption fine structure (XAFS). An analysis of the X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) for the Co and Fe K-edges of these composite hydrous oxides revealed that, regardless of the oxidation state of nickel sites in the films, the guest metal ions are present as Co3+ and Fe3+ and that the cobalt-oxygen distance d(Co-O) = 1.90 +/- 0.02 Angstrom and d(Fe-O) = 1.92 +/- 0.02 Angstrom. The latter values are in excellent agreement with d(Me-O) (Me = Co or Fe) in CoOOH and beta- and gamma-FeOOH, respectively, determined by conventional X-ray diffraction. Two clearly defined Me-Ni first coordination shells could be observed in the Fourier transforms (FT) of the K-edge EXAFS of the guest metal recorded at a potential at which both Ni2+ and Ni3+ sites are expected to be present. The relative intensities of these FT features could be varied by changing the applied potential or, equivalently, the relative population of the two nickel sites. On the basis of these results, the Me-Ni shells are ascribed to Co3+ adjacent to Ni2+ and Ni3+ sites. Furthermore, d(Ni-Co) and d(Ni-Fe) for a given nickel oxidation state are found to be essentially the same as those observed for d(Ni-Ni) in pure nickel hydrous oxide films. This provides evidence that Co3+ and Fe3+ ions replace Ni sites in the hydrous oxide lattice, forming single-phase materials. C1 CASE WESTERN RESERVE UNIV, DEPT CHEM, CLEVELAND, OH 44106 USA. ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. STANFORD SYNCHROTRON RADIAT LAB, STANFORD, CA 94309 USA. RI Tryk, Donald/D-5931-2012 OI Tryk, Donald/0000-0003-4660-9674 NR 31 TC 44 Z9 44 U1 2 U2 30 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 OCT 6 PY 1994 VL 98 IS 40 BP 10269 EP 10276 DI 10.1021/j100091a049 PG 8 WC Chemistry, Physical SC Chemistry GA PK740 UT WOS:A1994PK74000049 ER PT J AU SAVIKHIN, S ZHU, YW LIN, S BLANKENSHIP, RE STRUVE, WS AF SAVIKHIN, S ZHU, YW LIN, S BLANKENSHIP, RE STRUVE, WS TI FEMTOSECOND SPECTROSCOPY OF CHLOROSOME ANTENNAS FROM THE GREEN PHOTOSYNTHETIC BACTERIUM CHLOROFLEXUS-AURANTIACUS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID PICOSECOND ENERGY-TRANSFER; PUMP-PROBE SPECTROSCOPY; BACTERIOCHLOROPHYLL-C; PIGMENT ORGANIZATION; PROTEIN-FREE; POLARIZED FLUORESCENCE; CARBON-TETRACHLORIDE; CHLOROBIUM-LIMICOLA; TRANSFER KINETICS; LINEAR DICHROISM AB The antenna kinetics of bacteriochlorophyll (BChl) c- and a-containing chlorosomes from the thermophilic filamentous green photosynthetic bacterium Chloroflexus aurantiacus were investigated using two independent pump-probe techniques with subpicosecond resolution. Isotropic one- and two-color absorption difference experiments using probe wavelengths between 710 and 770 nm reveal BChl c photobleaching (PB) and stimulated emission (SE) decay kinetics with major lifetime components of 50-100 fs, 1-2 ps, and 7-10 ps. Two-color PB/SE profiles pumped at 770 nm and probed at 800 nm (where BChl a pigments absorb) exhibit no detectable rise time. However, two-color experiments using 790 and 820 nm pump and probe wavelengths, respectively, yield PB/SE rise components of 100 fs, 2 ps, and 10 ps. Upon excitation at 720 nm, the BChl c PB/SE spectrum observed using a broad-band probe continuum displays surprisingly little spectral evolution during the first 2 ps. Upon 760 nm excitation, the BChl c PB/SE spectrum experiences a small blue shift (from similar to 750 to similar to 744 nm) during the first picosecond. The one-color anisotropies r(t) in the BChl c spectrum initialize very close to 0.4 and subsequently exhibit little decay (r(infinity) similar to 0.36). Single-exponential analyses of one- and two-color anisotropies probed at 800 nm yield a component with a lifetime similar to 10 ps; the final anisotropies are generally small, indicating that the energy transfers in this region are accompanied by a large reorientation of Q, transition moments. The absorption difference profiles in the BChl c (but not in the BCN a) region of the chlorosome spectrum contain oscillating components at early times, which are damped within similar to 1 ps. They likely arise from vibrational coherences in the BChl c aggregate. Our results do not appear to be consistent with subpicosecond spectral equilibration among inequivalent BCN c pigments within the main BChl c absorption band. The essentially prompt PB/SE absorbance changes at wavelengths up to 800 nm suggest that some pigments absorbing near the latter wavelength are kinetically strongly coupled to the main BChl c pigment aggregates. This is accompanied by apparent energy transfer and depolarization (with kinetics that exhibit a 10 ps component) to longer-wavelength BChl a pigments that exhibit PB/SE in the 820 nm region. The latter BChl a pigments have orientations that differ considerably from those of the 800 nm pigments. Whether the 800 nm absorbing pigments are BChl a or long wavelength forms of BChl c is not yet clear. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. ARIZONA STATE UNIV,DEPT CHEM & BIOCHEM,TEMPE,AZ 85287. ARIZONA STATE UNIV,CTR STUDY EARLY EVENTS PHOTOSYNTHESIS,TEMPE,AZ 85287. NR 64 TC 61 Z9 63 U1 1 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD OCT 6 PY 1994 VL 98 IS 40 BP 10322 EP 10334 DI 10.1021/j100091a056 PG 13 WC Chemistry, Physical SC Chemistry GA PK740 UT WOS:A1994PK74000057 ER PT J AU THIYAGARAJAN, P TIEDE, DM AF THIYAGARAJAN, P TIEDE, DM TI DETERGENT MICELLE STRUCTURE AND MICELLE-MICELLE INTERACTIONS DETERMINED BY SMALL-ANGLE NEUTRON-SCATTERING UNDER SOLUTION CONDITIONS USED FOR MEMBRANE-PROTEIN CRYSTALLIZATION SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID PHOTOSYNTHETIC REACTION CENTER; X-RAY-DIFFRACTION; PHOTOCHEMICAL-REACTION CENTER; RHODOBACTER-SPHAEROIDES R-26; RHODOPSEUDOMONAS-VIRIDIS; 3-DIMENSIONAL CRYSTALS; OCTYL GLUCOSIDE; PHASE; SIZE AB We have characterized micelle structure and intermicelle interaction for the detergents lauryldimethylamine N-oxide, LDAO, and n-octyl-beta-D-glucoside, OG, under conditions used for protein crystallization using SANS. We found that LDAO and OG micelles differ significantly in size, sensitivity to heptanetriol, and nature of intermicelle interactions. Our results suggest that successful crystallization methods can be rationalized in terms of an optimization of micelle size, number density, flexibility of micelle radius of curvature, and suppression of intermicelle interactions. LDAO and OG micelles were found to differ significantly in size and shape. The LDAO micelle was found to be best fit as an ellipsoid with semiaxes of 30.6 and 19.4 Angstrom, while the OG micelle was found to be spherical with a radius of 22.9 Angstrom. The addition of heptanetriol to pure LDAO resulted in the formation of smaller, spherical, mixed micelles with radii in the range 17-21 Angstrom, depending upon conditions. The results suggest that both micelle size and curvature restrictions may contribute to the incompatibility of LDAO for protein crystallization in the absence of additional amphiphiles. The mixed OG-heptanetriol micelle was found to be significantly smaller than that with LDAO, having radii in the range 15-18 Angstrom, depending upon conditions, and exhibited a greater number density increase. Evidence was found for interaction between OG and polyethylene glycol, PEG, that prevents micelle aggregation at high ionic strength and likely contributes to the particular success of PEG as a protein precipitant when OG is used as the solubilizing detergent. These measurements suggest that the chemical constituents in membrane protein crystallization can be manipulated to optimize micelle size, number density, and interparticle interactions. RP THIYAGARAJAN, P (reprint author), ARGONNE NATL LAB,DIV INTENSE PULSED NEUTRON SOURCE & CHEM,BLDG 200,ARGONNE,IL 60439, USA. NR 32 TC 51 Z9 51 U1 3 U2 21 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 OCT 6 PY 1994 VL 98 IS 40 BP 10343 EP 10351 DI 10.1021/j100091a058 PG 9 WC Chemistry, Physical SC Chemistry GA PK740 UT WOS:A1994PK74000059 ER PT J AU MILLER, RJ FELLER, D AF MILLER, RJ FELLER, D TI COMMENT ON THE HYPERFINE-STRUCTURE OF THE X(2)-PI GROUND-STATE OF NITRIC-OXIDE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Note ID NO; SPECTROSCOPY; PARAMETERS; SPECTRUM; N-14O-16 RP MILLER, RJ (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 20 TC 3 Z9 3 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 OCT 6 PY 1994 VL 98 IS 40 BP 10375 EP 10375 DI 10.1021/j100091a064 PG 1 WC Chemistry, Physical SC Chemistry GA PK740 UT WOS:A1994PK74000065 ER PT J AU JIANG, CL REHM, KE GEHRING, J GLAGOLA, B KUTSCHERA, W RHEIN, M WUOSMAA, AH AF JIANG, CL REHM, KE GEHRING, J GLAGOLA, B KUTSCHERA, W RHEIN, M WUOSMAA, AH TI OBSERVATION OF THE ONE-NEUTRON TO 6-NEUTRON TRANSFER-REACTIONS AT SUBBARRIER ENERGIES SO PHYSICS LETTERS B LA English DT Article ID HEAVY-ION COLLISIONS; MULTIPAIR TRANSFER; NUCLEI AB Cross sections for the one- to six-neutron transfer reactions have been measured at sub-barrier energies in the system Ni-58 + Mo-100. The cross sections for multi-neutron transfer processes show an exponential falloff in agreement with recent theoretical calculations. Upper limits for the absolute yields to the ground states have been extracted and are compared to theoretical predictions. RP JIANG, CL (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 15 TC 38 Z9 38 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 OCT 6 PY 1994 VL 337 IS 1-2 BP 59 EP 62 DI 10.1016/0370-2693(94)91443-5 PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PK286 UT WOS:A1994PK28600011 ER PT J AU AKHOURY, R ROTHSTEIN, IZ AF AKHOURY, R ROTHSTEIN, IZ TI EIKONAL WAVE-FUNCTIONS AND MODEL-INDEPENDENT EXCLUSIVE B-DECAYS SO PHYSICS LETTERS B LA English DT Article ID EFFECTIVE FIELD-THEORY; SUDAKOV FORM-FACTOR; ASYMPTOTIC-BEHAVIOR; HEAVY MESONS; QUARKS; QCD AB In this letter we calculate the proper normalization for the B meson eikonal valence wave function used in exclusive B decays. The normalization appropriate for a hard scattering process renormalized at the scale mu is determined by calculating the short distance contribution to the purely leptonic decay. C1 UNIV MICHIGAN,RANDALL LAB PHYS,ANN ARBOR,MI 48109. RP AKHOURY, R (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Rothstein, Ira/O-2747-2014 OI Rothstein, Ira/0000-0002-3374-4212 NR 13 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 OCT 6 PY 1994 VL 337 IS 1-2 BP 176 EP 180 DI 10.1016/0370-2693(94)91464-8 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PK286 UT WOS:A1994PK28600032 ER PT J AU WALLACE, DC AF WALLACE, DC TI STATISTICAL-MECHANICAL THEORY OF LIQUID ENTROPY SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Article ID ELEMENTS; FLUIDS AB The multiparticle correlation expansion for the entropy of a classical monatomic liquid is presented. This entropy expresses the physical picture in which there is no free particle motion, but, rather, each atom moves within a cage formed by its neighbors. The liquid expansion, including only pair correlations, gives an excellent account of the experimental entropy of most liquid metals, of liquid argon, and of the hard-sphere liquid. The pair correlation entropy is well approximated by a universal function of temperature. Higher-order correlation entropy, due to n-particle irreducible correlations for n greater than or equal to 3, is significant in only a few liquid metals, and its occurrence suggests the presence of n-body forces. When the liquid theory is applied to the study of melting, we discover the important classification of normal and anomalous melting, according to whether there is not or is a significant change in the electronic structure upon melting, and we discover the universal disordering entropy for melting of a monatomic crystal. Interesting directions for future research are extension to include orientational correlations of molecules, theoretical calculation of the entropy of water, application to the entropy of the amorphous state, and correlational entropy of compressed argon. We clarify the relation among different entropy expansions in the recent literature. (C) 1994 John Wiley & Sons, Inc. RP WALLACE, DC (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 20 TC 12 Z9 12 U1 0 U2 10 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 OCT 5 PY 1994 VL 52 IS 2 BP 425 EP 435 DI 10.1002/qua.560520215 PG 11 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA PH186 UT WOS:A1994PH18600014 ER PT J AU SELTZER, S AF SELTZER, S TI 13-ACETOXY-13-DESMETHYLRETINAL - SYNTHESIS, INCORPORATION INTO BACTERIORHODOPSIN, AND ITS APPARENT INACTIVATING EFFECT SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID CIS-TRANS ISOMERIZATION; PURPLE MEMBRANE; DARK-ADAPTATION; ONE-STEP; MODEL; RHODOPSIN; PIGMENTS; PROTEIN; LIGHT; MALEYLACETONE RP SELTZER, S (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 36 TC 5 Z9 5 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD OCT 5 PY 1994 VL 116 IS 20 BP 9383 EP 9384 DI 10.1021/ja00099a087 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA PK979 UT WOS:A1994PK97900087 ER PT J AU XU, XF GRIGOROPOULOS, CP RUSSO, RE AF XU, XF GRIGOROPOULOS, CP RUSSO, RE TI MEASUREMENT OF SOLID-LIQUID INTERFACE TEMPERATURE DURING PULSED EXCIMER-LASER MELTING OF POLYCRYSTALLINE SILICON FILMS SO APPLIED PHYSICS LETTERS LA English DT Article ID GERMANIUM AB A nanosecond time resolution pyrometer has been developed for measuring the transient temperature of thin polycrystalline silicon (p-Si) films irradiated by a pulsed excimer laser. The sample design structure and material optical properties allow direct measurement of the temperature at the solid-liquid phase change interface. (C) 1994 American Institute of Physics. C1 LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. RP XU, XF (reprint author), UNIV CALIF BERKELEY,DEPT MECH ENGN,BERKELEY,CA 94720, USA. NR 11 TC 31 Z9 32 U1 2 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 OCT 3 PY 1994 VL 65 IS 14 BP 1745 EP 1747 DI 10.1063/1.113044 PG 3 WC Physics, Applied SC Physics GA PK152 UT WOS:A1994PK15200005 ER PT J AU AFFATIGATO, M TANG, K HAGLUND, RF CHEN, CH AF AFFATIGATO, M TANG, K HAGLUND, RF CHEN, CH TI ULTRAVIOLET-LASER-INDUCED DESORPTION OF ATOMS, IONS, AND MOLECULES FROM LITHIUM-NIOBATE SO APPLIED PHYSICS LETTERS LA English DT Article ID ABLATION; LINBO3 AB We report measurements of ultraviolet-laser-induced desorption of atoms, ions, and molecules from the surface of single-crystal, Y-cut lithium niobate at intensities below the plasma threshold. Particularly striking is the desorption of LiNbO3 molecules at intensities well below the threshold for the atomic and ion emission. Measurement of oxygen and niobium yields above and below the plasma threshold show changes in surface stoichiometry. (C) 1994 American Institute of Physics. C1 OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,PHOTOPHYS SECT,OAK RIDGE,TN 37837. RP AFFATIGATO, M (reprint author), VANDERBILT UNIV,DEPT PHYS & ASTRON,NASHVILLE,TN 37235, USA. RI Tang, Kai/A-2194-2011 NR 13 TC 11 Z9 11 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 OCT 3 PY 1994 VL 65 IS 14 BP 1751 EP 1753 DI 10.1063/1.112906 PG 3 WC Physics, Applied SC Physics GA PK152 UT WOS:A1994PK15200007 ER PT J AU LORETTO, D ROSS, FM LUCAS, CA WONG, GCL AF LORETTO, D ROSS, FM LUCAS, CA WONG, GCL TI DIRECT OBSERVATION OF INTERFACE AND SURFACE STEPS IN EPITAXIAL-FILMS BY DARK-FIELD TRANSMISSION ELECTRON-MICROSCOPY SO APPLIED PHYSICS LETTERS LA English DT Article ID SILICON OXIDATION; ATOMIC STEPS; TEMPERATURE; GROWTH AB We have used dark-field transmission electron microscopy to investigate <5 nm thick CaF2 films grown on Si(111) by molecular-beam epitaxy. Images formed with CaF2 [111BAR] reflections exhibit contrast at 1/3[111] height steps at the CaF2 surface and at the CaF2/Si interface over large (> 100 mum2), statistically significant areas. Direct evidence for step-flow growth in CaF2 has been obtained. (C) 1994 American Institute of Physics. C1 LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP LORETTO, D (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,MAIL STOP 2-200,BERKELEY,CA 94720, USA. OI Lucas, Christopher/0000-0001-5743-3868 NR 18 TC 4 Z9 4 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 3 PY 1994 VL 65 IS 14 BP 1766 EP 1768 DI 10.1063/1.112912 PG 3 WC Physics, Applied SC Physics GA PK152 UT WOS:A1994PK15200012 ER PT J AU ZHU, YM SUENAGA, M SABATINI, RL AF ZHU, YM SUENAGA, M SABATINI, RL TI MISORIENTATION ANGLE DISTRIBUTIONS FOR LARGE-ANGLE GRAIN-BOUNDARIES IN BI2SR2CACU2O8 AND BI2SR2CA2CU3O10 COMPOSITE TAPES SO APPLIED PHYSICS LETTERS LA English DT Article ID YBA2CU3O7-DELTA AB The angular distributions of large-angle grain boundaries were studied by electron microscopy for Bi(2:2:1:2) and Bi(2:2:2:3) composite tapes. For Bi(2:2:2:3) the distributions are random, while for Bi(2:2:1:2), there was a high incidence of special boundary misorientations. The preferred orientations in Bi(2:2:1:2), which were analyzed for [001] and [100] rotations, agreed well with the calculated lattice coincidences based on the constraint Coincidence Site Lattice model, and were attributed to the reorientation of the neighboring grains during its partial melt process. (C) 1994 American Institute of Physics. RP ZHU, YM (reprint author), BROOKHAVEN NATL LAB,DIV MAT SCI,UPTON,NY 11973, USA. NR 12 TC 28 Z9 28 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 3 PY 1994 VL 65 IS 14 BP 1832 EP 1834 DI 10.1063/1.112967 PG 3 WC Physics, Applied SC Physics GA PK152 UT WOS:A1994PK15200034 ER PT J AU CHRISTIDES, C PANAGIOTOPOULOS, I NIARCHOS, D TSAKALAKOS, T JANKOWSKI, AF AF CHRISTIDES, C PANAGIOTOPOULOS, I NIARCHOS, D TSAKALAKOS, T JANKOWSKI, AF TI THE ANISOTROPIC MAGNETORESISTANCE IN FE/PT COMPOSITIONALLY MODULATED FILMS SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID MAGNETIC-ANISOTROPY; MULTILAYERS; ALLOYS; SPECTROSCOPY AB The anisotropic nature of the resistivity of magnetic multilayers under a parallel or perpendicular applied magnetic field is addressed by magnetoresistivity and hysteresis loop measurements. It is shown that the observation of anisotropic magnetoresistance (AMR) at 80 K can provide straightforward information on the magnetic properties of successive layers in Fe/Pt multilayers. The relative as well as absolute Fe and Pt thicknesses are critical for the AMR behaviour. For Fe layer thicknesses t(Fe) less than 5 Angstrom both p parallel to and rho perpendicular to increase initially as a function of the applied field H while for larger t(Fe)rho perpendicular to always decreases. The anomalous AMR for t(Fe) < 5 Angstrom is attributed to an inclination of the Fe magnetization out of the film's plane. C1 RUTGERS STATE UNIV,DEPT MECH & MAT SCI,PISCATAWAY,NJ 08855. LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550. RP CHRISTIDES, C (reprint author), DEMOKRITOS NATL CTR SCI RES,INST SCI MAT,AGHIA PARASKEVI,GR-15310 ATHENS,GREECE. OI NIARCHOS, DIMITRIOS/0000-0002-6256-7497 NR 17 TC 5 Z9 5 U1 0 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD OCT 3 PY 1994 VL 6 IS 40 BP 8187 EP 8195 DI 10.1088/0953-8984/6/40/010 PG 9 WC Physics, Condensed Matter SC Physics GA PK926 UT WOS:A1994PK92600010 ER PT J AU WERNER, TR DOBACZEWSKI, J GUIDRY, MW NAZAREWICZ, W SHEIKH, JA AF WERNER, TR DOBACZEWSKI, J GUIDRY, MW NAZAREWICZ, W SHEIKH, JA TI MICROSCOPIC ASPECTS OF NUCLEAR-DEFORMATION SO NUCLEAR PHYSICS A LA English DT Article ID HARTREE-FOCK CALCULATIONS; SKYRMES INTERACTION; ROTATIONAL BANDS; DEFORMED-NUCLEI; REGION; TRANSITION; MASS; ISOTOPES; SHAPES; MODEL AB The self-consistent approach based on the Skyrme Hartree-Fock+BCS model is used to analyze the microscopic origin of nuclear equilibrium deformations. Neutron-proton, neutron-neutron and proton-proton multipole interaction energies are analyzed and their role in the onset of quadrupole deformation is discussed. It is concluded that nuclear deformation results from a subtle interplay between the deformation-driving neutron-proton part of the energy (varying smoothly with the shell filling) and the symmetry-restoring monopole part of the total energy (responsible for shell effects). Shell fluctuations of the monopole part of the total energy are discussed in terms of the Nilsson model. The interplay of normal-parity and unique-parity orbitals in controlling the systematic behavior of strongly deformed intrinsic configurations is analyzed within the shell-correction approach. C1 UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. TATA INST FUNDAMENTAL RES,BOMBAY 400005,INDIA. UNIV WARSAW,INST THEORET PHYS,PL-00681 WARSAW,POLAND. RP WERNER, TR (reprint author), OAK RIDGE NATL LAB,DIV PHYS,POB 2008,OAK RIDGE,TN 37831, USA. NR 79 TC 33 Z9 34 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 OCT 3 PY 1994 VL 578 IS 1-2 BP 1 EP 30 DI 10.1016/0375-9474(94)90966-0 PG 30 WC Physics, Nuclear SC Physics GA PJ433 UT WOS:A1994PJ43300001 ER PT J AU MORNINGSTAR, CJ WEINSTEIN, M AF MORNINGSTAR, CJ WEINSTEIN, M TI CONTRACTOR RENORMALIZATION-GROUP METHOD - A NEW COMPUTATIONAL TECHNIQUE FOR LATTICE SYSTEMS SO PHYSICAL REVIEW LETTERS LA English DT Article ID VARIATIONAL-METHODS; FIELD-THEORIES; KONDO-LATTICE; ISING-MODEL; DIMENSIONS; ALGORITHMS AB The contractor renormalization group (CORE) method, a new approach to solving Hamiltonian lattice systems, is introduced. The method combines contraction and variational techniques with the real-space renormalization group approach. It applies to lattice systems of infinite extent and is ideal for studying phase structure and critical phenomena. The CORE approximation is systematically improvable and can treat systems with dynamical fermions. The method is tested using the (1 + 1)-dimensional Ising model. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP MORNINGSTAR, CJ (reprint author), UNIV EDINBURGH,DEPT PHYS & ASTRON,EDINBURGH EH9 3JZ,MIDLOTHIAN,SCOTLAND. RI Morningstar, Colin/N-6925-2014 OI Morningstar, Colin/0000-0002-0607-9923 NR 29 TC 42 Z9 42 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 OCT 3 PY 1994 VL 73 IS 14 BP 1873 EP 1877 DI 10.1103/PhysRevLett.73.1873 PG 5 WC Physics, Multidisciplinary SC Physics GA PJ424 UT WOS:A1994PJ42400001 ER PT J AU GINOCCHIO, JN LEVIATAN, A AF GINOCCHIO, JN LEVIATAN, A TI QUADRUPOLE COLLECTIVITY WITH ISOSPIN SO PHYSICAL REVIEW LETTERS LA English DT Article ID INTERACTING-BOSON-MODEL; PROTON; NUCLEI; SHELL AB We study intrinsic aspects of quadrupole collectivity with conserved isospin in the framework of the interacting boson model (IBM-3) of nuclei. A geometric visualization is achieved by means of a novel type of intrinsic states which are deformed in angular momentum yet have well-defined isospin. The energy surface of the general IBM-3 Hamiltonian is derived, and normal modes are identified for prolate deformations. C1 HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. RP GINOCCHIO, JN (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 14 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 3 PY 1994 VL 73 IS 14 BP 1903 EP 1906 DI 10.1103/PhysRevLett.73.1903 PG 4 WC Physics, Multidisciplinary SC Physics GA PJ424 UT WOS:A1994PJ42400008 ER PT J AU DAWSON, S GREBOGI, C SAUER, T YORKE, JA AF DAWSON, S GREBOGI, C SAUER, T YORKE, JA TI OBSTRUCTIONS TO SHADOWING WHEN A LYAPUNOV EXPONENT FLUCTUATES ABOUT ZERO SO PHYSICAL REVIEW LETTERS LA English DT Article ID DYNAMIC-SYSTEMS; TRAJECTORIES AB We study the existence or nonexistence of true trajectories of chaotic dynamical systems that lie close to computer-generated trajectories. The nonexistence of such shadowing trajectories is caused by finite-time Lyapunov exponents of the system fluctuating about zero. A dynamical mechanism of the unshadowability is explained through a theoretical model and identified in simulations of a typical physical system. The problem of fluctuating Lyapunov exponents is expected to be common in simulations of higher-dimensional systems. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV MARYLAND,DEPT MATH,COLLEGE PK,MD 20742. GEORGE MASON UNIV,DEPT MATH SCI,FAIRFAX,VA 22030. UNIV MARYLAND,INST PHYS SCI & TECHNOL,COLLEGE PK,MD 20742. RP DAWSON, S (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. RI Sauer, Timothy/H-8272-2012; OI Sauer, Timothy/0000-0002-8501-8722; Ponce Dawson, Silvina/0000-0001-6550-4267 NR 13 TC 129 Z9 132 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 OCT 3 PY 1994 VL 73 IS 14 BP 1927 EP 1930 DI 10.1103/PhysRevLett.73.1927 PG 4 WC Physics, Multidisciplinary SC Physics GA PJ424 UT WOS:A1994PJ42400014 ER PT J AU YOUNG, PE AF YOUNG, PE TI SPATIAL PROFILES OF STIMULATED BRILLOUIN-SCATTERING ION WAVES IN A LASER-PRODUCED PLASMA SO PHYSICAL REVIEW LETTERS LA English DT Article ID PARAMETRIC-INSTABILITIES; INHOMOGENEOUS PLASMAS; ELECTROMAGNETIC-WAVES; BACKSCATTERED LIGHT; WAVELENGTH AB The ion fluctuation axial profile is measured by Thomson scattering in an inhomogeneous laser-produced plasma. The electron temperature and plasma drift velocity at the location of the measured ion waves and the plasma density profile are simultaneously measured. The measured ion fluctuation profile is compared to the profile predicted by convective growth of the stimulated Brillouin scattering instability calculated from the measured hydrodynamic profiles. RP YOUNG, PE (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5508,LIVERMORE,CA 94550, USA. NR 21 TC 22 Z9 22 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 OCT 3 PY 1994 VL 73 IS 14 BP 1939 EP 1942 DI 10.1103/PhysRevLett.73.1939 PG 4 WC Physics, Multidisciplinary SC Physics GA PJ424 UT WOS:A1994PJ42400017 ER PT J AU DEMELO, CARS AF DEMELO, CARS TI VORTEX COOLING SO PHYSICAL REVIEW LETTERS LA English DT Article ID II SUPERCONDUCTORS; ATOMIC-BEAM; CORE AB Resonant optical absorption spontaneous emission of photons by quasiparticles inside of a vortex core in type-II superconductors results in a net momentum transfer to the vortex (scattering force). Similar to the case of atomic physics (laser cooling), this scattering force is quantum in nature, nonlinear in the vector potential of the photon, and can be used to cool or heat vortices. To illustrate this cooling or heating effect we calculate the total dissipation as a function of photon frequency in the presence of the scattering force. RP DEMELO, CARS (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 16 TC 3 Z9 3 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 3 PY 1994 VL 73 IS 14 BP 1978 EP 1981 DI 10.1103/PhysRevLett.73.1978 PG 4 WC Physics, Multidisciplinary SC Physics GA PJ424 UT WOS:A1994PJ42400027 ER PT J AU WU, RQ FREEMAN, AJ AF WU, RQ FREEMAN, AJ TI LIMITATION OF THE MAGNETIC-CIRCULAR-DICHROISM SPIN SUM-RULE FOR TRANSITION-METALS AND IMPORTANCE OF THE MAGNETIC DIPOLE TERM SO PHYSICAL REVIEW LETTERS LA English DT Article ID ABSORPTION; NICKEL AB Magnetic-circular-dichroism (MCD) spectra and the spin magnetic dipole term ([T(z)]) for bulk 3d transition metals and their surfaces were calculated from full potential linearized augmented plane wave electronic band structure results. The recently proposed MCD spin sum rule is found to result in a much larger error [of up to 50% for the Ni(001) surface] than does its orbital counterpart. In support of recent experiments for bulk, we find that by combining the MCD orbital and spin sum rules the ratio of spin and orbital moments can be determined from the MCD spectra even for low dimension systems with an error of 10% when the [T(z)] contribution is included. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP WU, RQ (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. RI Wu, Ruqian/C-1395-2013 OI Wu, Ruqian/0000-0002-6156-7874 NR 11 TC 229 Z9 231 U1 1 U2 18 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 OCT 3 PY 1994 VL 73 IS 14 BP 1994 EP 1997 DI 10.1103/PhysRevLett.73.1994 PG 4 WC Physics, Multidisciplinary SC Physics GA PJ424 UT WOS:A1994PJ42400031 ER PT J AU SPANNE, P THOVERT, JF JACQUIN, CJ LINDQUIST, WB JONES, KW ADLER, PM AF SPANNE, P THOVERT, JF JACQUIN, CJ LINDQUIST, WB JONES, KW ADLER, PM TI SYNCHROTRON COMPUTED MICROTOMOGRAPHY OF POROUS-MEDIA - TOPOLOGY AND TRANSPORTS SO PHYSICAL REVIEW LETTERS LA English DT Article ID IMAGE-ANALYSIS; PERMEABILITY; REAL AB Computed microtomography is applied to a piece of Fontainebleau sandstone in order to determine the geometrical structure of the pores. The topology of the void space is then derived from the tomographic image of the volume. Permeability and conductivity are computed and found in good agreement with experimental data. Perspectives offered by this new nondestructive method with a potential resolution of the order of one micrometer or less are analyzed. C1 LAB PHENOMENES TRANSPORT MELANGES,F-86360 CHASSENEUIL,FRANCE. INST FRANCAIS PETR,F-92506 RUEIL MALMAISON,FRANCE. SUNY STONY BROOK,STONY BROOK,NY 11794. RP SPANNE, P (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 17 TC 287 Z9 295 U1 2 U2 21 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 OCT 3 PY 1994 VL 73 IS 14 BP 2001 EP 2004 DI 10.1103/PhysRevLett.73.2001 PG 4 WC Physics, Multidisciplinary SC Physics GA PJ424 UT WOS:A1994PJ42400033 ER PT J AU FEIBELMAN, PJ AF FEIBELMAN, PJ TI WRITING RESEARCH PAPERS - PUBLISHING WITHOUT PERISHING .1. SO SCIENTIST LA English DT Article AB In the first of a three-part series of excerpts from his book A Ph.D. Is Not Enough!, Peter J. Feibelman, a physicist at Sandia National Laboratories, offers suggestions on the art of writing a successful research paper. RP FEIBELMAN, PJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU SCIENTIST INC PI PHILADELPHIA PA 3600 MARKET ST SUITE 450, PHILADELPHIA, PA 19104 SN 0890-3670 J9 SCIENTIST JI Scientist PD OCT 3 PY 1994 VL 8 IS 19 BP 21 EP & PG 0 WC Information Science & Library Science; Multidisciplinary Sciences SC Information Science & Library Science; Science & Technology - Other Topics GA PK104 UT WOS:A1994PK10400016 ER PT J AU DAROVSKY, A KESERASHVILI, V HARLOW, R MUTIKAINEN, I AF DAROVSKY, A KESERASHVILI, V HARLOW, R MUTIKAINEN, I TI STRUCTURE OF OXIDIZED FORMS OF NEODYMIUM AND PRASEODYMIUM (BIS)PHTHALOCYANINES SO ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE LA English DT Article ID DIMENSIONAL MOLECULAR SEMICONDUCTOR; COMPLEXES; LUTETIUM; PHTHALOCYANINES; DECKER AB The structure of the tetragonal alpha-phase of lanthanide derivatives of (bis)phthalocyanine PcL(III)Pc(ox) (Pc = [C32H16N8](2-), Pc(ox) = [C32H16N8](-), L = lanthanide) crystals is reported. The crystals of PcNdPc(ox) (I) and PcPrPc(ox) (II) crystallized on a platinum anode with (I) a = 19.544 (2), c = 6.514 (1) Angstrom, Z = 2, P4/nnc, (II) a = 20.066 (7), c = 6.463 (2) Angstrom, Z = 2, P4/nnc. The structure is built up from columns of equi-distantly separated sandwich-like molecules. The molecular columns are arranged in a regular square lattice, allowing the stacks to be shifted along the stack axis. The remarkable feature of this structure is the similar to 1:2.7 ratio of the metal-site occupancy coefficients, which is interpreted in terms of a disordered superstructure, the disorder being caused by the presence of a small amount of a triple-decker PcLPcLPc complex. C1 DUPONT CO INC,DEPT CENT RES & DEV,EXPTL STN,WILMINGTON,DE 19880. UNIV HELSINKI,DEPT CHEM,SF-00014 HELSINKI,FINLAND. RP DAROVSKY, A (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE DEPT,SUNY X3,UPTON,NY 11973, USA. NR 19 TC 16 Z9 16 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-7681 J9 ACTA CRYSTALLOGR B JI Acta Crystallogr. Sect. B-Struct. Commun. PD OCT 1 PY 1994 VL 50 BP 582 EP 588 DI 10.1107/S0108768194004192 PN 5 PG 7 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA PL238 UT WOS:A1994PL23800011 ER PT J AU JORDAN, RG LIU, Y QIU, SL STOCKS, GM SHELTON, WA GINATEMPO, B AF JORDAN, RG LIU, Y QIU, SL STOCKS, GM SHELTON, WA GINATEMPO, B TI THE ORIGIN OF SHORT-RANGE ORDER IN AG-MG ALLOYS SO ACTA METALLURGICA ET MATERIALIA LA English DT Article AB We have calculated the Fermi surfaces of a number of alpha-phase Ag Mg solid solution alloys. We find that there are well-defined, parallel regions of surface in the [110] directions at which nesting could occur giving rise to the formation of concentration waves and satellite peaks in the electron diffuse scattering. The positions of the intensity maxima are related directly to the vector spanning such parallel regions and we show that the calculated variation of the peak separation with Mg concentration is in excellent agreement with the experimentally measured values. Thus, we provide strong evidence that the short-range-order in alpha-phase Ag-Mg alloys is Fermi surface driven. C1 OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. UNIV MESSINA, DIPARTIMENTO FIS, I-98166 SANT AGATA DI MILITELLO, ITALY. RP JORDAN, RG (reprint author), FLORIDA ATLANTIC UNIV, DEPT PHYS, ALLOY RES CTR, BOCA RATON, FL 33431 USA. RI Stocks, George Malcollm/Q-1251-2016 OI Stocks, George Malcollm/0000-0002-9013-260X NR 12 TC 4 Z9 4 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD OCT PY 1994 VL 42 IS 10 BP 3535 EP 3538 DI 10.1016/0956-7151(94)90485-5 PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PF505 UT WOS:A1994PF50500029 ER PT J AU SCHULZ, DL MARKS, TJ AF SCHULZ, DL MARKS, TJ TI MOCVD ROUTES TO THIN METAL-OXIDE FILMS FOR SUPERCONDUCTING ELECTRONICS SO ADVANCED MATERIALS LA English DT Review ID CHEMICAL-VAPOR-DEPOSITION; CU-O-FILMS; YTTRIA-STABILIZED ZIRCONIA; BETA-DIKETONATE COMPLEXES; HIGH CRITICAL CURRENTS; MICROWAVE SURFACE-RESISTANCE; ORGANOMETALLIC BEAM EPITAXY; PULSED LASER DEPOSITION; CALCIUM-COPPER-OXIDE; BUFFER LAYERS AB Superconducting, semiconducting and insulating oxide thin films are of interest for applications as active and passive components in microelectronic device technologies. Metal organic chemical vapor deposition (MOCVD) is an important method of thin film production and its use in developing device structures such as that in the figure is discussed. C1 NORTHWESTERN UNIV,DEPT CHEM,EVANSTON,IL 60208. NORTHWESTERN UNIV,SCI & TECHNOL CTR SUPERCONDUCT,EVANSTON,IL 60208. RP SCHULZ, DL (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 130 TC 68 Z9 68 U1 2 U2 12 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0935-9648 J9 ADV MATER JI Adv. Mater. PD OCT PY 1994 VL 6 IS 10 BP 719 EP 730 DI 10.1002/adma.19940061003 PG 12 WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Chemistry; Science & Technology - Other Topics; Materials Science; Physics GA PR859 UT WOS:A1994PR85900002 ER PT J AU SIEGAL, RW MATSON, D LOGIUDICE, SM THOMAS, A DABAGHIAN, JH AF SIEGAL, RW MATSON, D LOGIUDICE, SM THOMAS, A DABAGHIAN, JH TI ADVANCES IN NANOPHASE CERAMICS SO ADVANCED MATERIALS & PROCESSES LA English DT Article C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. THREE M CO, DEPT CERAM MAT, ST PAUL, MN 55144 USA. MITSUBISHI MIN & CEMENT CO LTD, CHIYODA KU, TOKYO 100, JAPAN. NANOPHASE TECHNOL CORP, DARIEN, IL USA. ULTRAM INT, DENVER, CO 80202 USA. RP SIEGAL, RW (reprint author), ARGONNE NATL LAB, 9700 S CASS AVE, ARGONNE, IL 60439 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 0026-0665 J9 ADV MATER PROCESS JI Adv. Mater. Process. PD OCT PY 1994 VL 146 IS 4 BP 25 EP 27 PG 3 WC Materials Science, Multidisciplinary SC Materials Science GA QK864 UT WOS:A1994QK86400003 ER PT J AU NOVICK, VJ AF NOVICK, VJ TI PLUGGING PASSAGES WITH PARTICLES - REFINING THE MOREWITZ CRITERIA SO AEROSOL SCIENCE AND TECHNOLOGY LA English DT Article AB The Morewitz Criteria was developed predict the quantity of aerosol mass entering a tube or passageway that would result in a particle plug precluding further aerosol transport. However, a few studies have shown the criteria to be invalid for certain situations. This paper proposes an initial test condition that must first be met before the Morewitz Criteria is considered valid. This test condition, based on Davies' Criteria for still air sampling, identifies the physical mechanism responsible for the initial particle deposition and subsequent deposit growth that leads to a plug, provides an explanation for the observed location of particle plugs in tubes, and defines the range of useful application of the Morewitz Criteria. C1 S3 TECHNOL INC,DOWNERS GROVE,IL. RP NOVICK, VJ (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 11 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0278-6826 J9 AEROSOL SCI TECH JI Aerosol Sci. Technol. PD OCT PY 1994 VL 21 IS 3 BP 219 EP 222 DI 10.1080/02786829408959710 PG 4 WC Engineering, Chemical; Engineering, Mechanical; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA PJ024 UT WOS:A1994PJ02400003 ER PT J AU BELL, JB SZYMCZAK, WG AF BELL, JB SZYMCZAK, WG TI PROJECTION METHOD FOR VISCOUS INCOMPRESSIBLE-FLOW ON QUADRILATERAL GRIDS SO AIAA JOURNAL LA English DT Article ID NAVIER-STOKES EQUATIONS AB This paper describes a second-order projection method for the incompressible Navier-Stokes equations on multiply connected domains with a logically rectangular quadrilateral grid. The method uses a second-order fractional step scheme in which one first solves diffusion-convection equations to determine intermediate velocities which are then projected onto the space of divergence-free vector fields. The spatial discretizations are accomplished by formally transforming the equations to a computational space with a uniform grid. The diffusion, pressure gradient, and divergence terms are discretized using standard finite difference approximations. The convection terms are discretized using a second-order Godunov method that provides a robust discretization of these terms at high Reynolds number. Numerical results are presented illustrating the performance of the method. C1 USN,CTR SURFACE WARFARE,INFORMAT SCI & SYST BRANCH,SILVER SPRING,MD 20903. RP BELL, JB (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR COMPUTAT SCI & COMP,POB 808,LIVERMORE,CA 94550, USA. NR 20 TC 15 Z9 15 U1 1 U2 5 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 OCT PY 1994 VL 32 IS 10 BP 1961 EP 1969 DI 10.2514/3.12239 PG 9 WC Engineering, Aerospace SC Engineering GA PJ487 UT WOS:A1994PJ48700003 ER PT J AU VAHDAT, N SWEARENGEN, PM JOHNSON, JS AF VAHDAT, N SWEARENGEN, PM JOHNSON, JS TI ADSORPTION PREDICTION OF BINARY-MIXTURES ON ADSORBENTS USED IN RESPIRATOR CARTRIDGES AND AIR-SAMPLING MONITORS SO AMERICAN INDUSTRIAL HYGIENE ASSOCIATION JOURNAL LA English DT Article ID SERVICE LIFE; THEORETICAL-MODEL; ACTIVATED CARBONS; KINETICS; VAPOR; EQUILIBRIUM; EQUATIONS; CHARCOAL; DIOXIDE AB A mathematical method was developed for predicting the performance of respirator cartridges and air-sampling monitors in the presence of binary mixtures. This method uses only data for pure-component adsorption equilibrium to calculate the breakthrough curves of the two components in a binary vapor mixture. The Ideal Adsorbed Solution Theory was used to calculate the adsorption equilibria for the components in a binary mixture. The adsorption capacities were then used in expressions similar to the modified Wheeler equation for pure compounds to determine the breakthrough curves for the binary mixture. This technique applies to a wide variety of binary mixture/adsorbent systems. In the present study it was successfully applied to the adsorption of four binary mixtures of acetone and m-xylene on activated carbon, three binary mixtures of acetone and styrene on activated carbon, and a binary mixture of carbon dioxide and water vapor on a molecular sieve. The predicted breakthrough curves were in agreement with experimental data. C1 LAWRENCE LIVERMORE NATL LAB,DEPT HAZARD CONTROL,LIVERMORE,CA 94550. RP VAHDAT, N (reprint author), TUSKEGEE UNIV,DEPT CHEM ENGN,TUSKEGEE,AL 36088, USA. NR 29 TC 8 Z9 9 U1 1 U2 8 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 OCT PY 1994 VL 55 IS 10 BP 909 EP 917 DI 10.1080/15428119491018402 PG 9 WC Environmental Sciences; Public, Environmental & Occupational Health SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health GA PM526 UT WOS:A1994PM52600005 ER PT J AU DUBCOVSKY, J DVORAK, J AF DUBCOVSKY, J DVORAK, J TI GENOME ORIGINS OF TRITICUM-CYLINDRICUM, TRITICUM-TRIUNCIALE, AND TRITICUM-VENTRICOSUM (POACEAE) INFERRED FROM VARIATION IN RESTRICTION PATTERNS OF REPEATED NUCLEOTIDE-SEQUENCES - A METHODOLOGICAL STUDY SO AMERICAN JOURNAL OF BOTANY LA English DT Article ID REPEATED DNA-SEQUENCES; REPETITIVE SEQUENCES; ASPARTATE-AMINOTRANSFERASE; PUTATIVE PROGENITORS; MOLECULAR DRIVE; EVOLUTION; AEGILOPS; WHEAT; IDENTIFICATION; DIVERSITY AB Three methods of phylogenetic inferences on polyploid plants employing variation in restriction sites in repeated nucleotide sequences were compared. Allotetraploid Triticum species of well-established origin were used as a model. Methods based on determination of the proportion of restriction fragments shared between a polyploid and its diploid relatives generated biased results because of uneven numbers of restriction fragments among diploid species and presence of common bands in phylogenetically related diploid species. A method employing restriction fragments unique to a diploid species (marker bands) was not affected by either factor and generated results consistent with cytogenetic inferences. It is shown that the latter method can be used to investigate the origin of a polyploid species even when one of its progenitors is extinct or when the polyploid and its diploid progenitors have diverged. C1 LAWRENCE LIVERMORE NATL LAB,DEPT AGRON & RANGE SCI,DAVIS,CA 95616. RI Dubcovsky, Jorge/A-4969-2008 OI Dubcovsky, Jorge/0000-0002-7571-4345 NR 47 TC 15 Z9 17 U1 0 U2 1 PU BOTANICAL SOC AMER INC PI COLUMBUS PA OHIO STATE UNIV-DEPT BOTANY 1735 NEIL AVE, COLUMBUS, OH 43210 SN 0002-9122 J9 AM J BOT JI Am. J. Bot. PD OCT PY 1994 VL 81 IS 10 BP 1327 EP 1335 DI 10.2307/2445408 PG 9 WC Plant Sciences SC Plant Sciences GA PM434 UT WOS:A1994PM43400012 ER PT J AU MALDONADO, HM CALA, PM AF MALDONADO, HM CALA, PM TI LABELING OF THE AMPHIUMA ERYTHROCYTE K+ H+ EXCHANGER WITH H2DIDS SO AMERICAN JOURNAL OF PHYSIOLOGY-CELL PHYSIOLOGY LA English DT Article DE CELL VOLUME REGULATION; RED BLOOD CELLS; AFFINITY LABELING; TRANSPORT PROTEINS; CHLORIDE BICARBONATE EXCHANGER; SODIUM-HYDROGEN EXCHANGE; ELECTRONEUTRAL ION TRANSPORT ID RED-BLOOD-CELLS; L-LACTATE TRANSPORT; VOLUME REGULATION; PLASMA-MEMBRANE; PROTEIN-PHOSPHORYLATION; TURKEY ERYTHROCYTES; PROTON-EXCHANGE; NA/H EXCHANGE; H+ EXCHANGE; INHIBITION AB Subsequent to swelling, the Amphiuma red blood cells lose K+, Cl-, and water until normal cell volume is restored. Net solute loss is the result of K+/H+ and Cl-/HCO3-, exchangers functionally coupled through changes in pH and therefore HCO3-. Whereas the Cl-/HCO3- exchanger is constitutively active, K+/H+ actively is induced by cell swelling. The constitutive Cl-/HCO3- exchanger is inhibited by low concentrations (<1 mu M) of 4,4'-diisothiocyanostilbene-2,2'-disulfo acid (DIDS) or H2DIDS, yet the concentration of H2DIDS > 25 mu M irreversibly modifies the K+/H+ exchanger in swollen cells. We exploited the volume-dependent irreversible low-affinity reaction between H2DIDS and the K+/H+ to identify the protein(s) associated with K+/H+ exchange activity. Labeling of the membrane proteins of intact cells with (H2DIDS)-H-3 results in high-affinity labeling of a broad 100-kDa band, thought to be the anion exchanger. Additional swelling-dependent low-affinity labeling at 110 kDa suggests the possibility of a volume-induced population of anion exchangers. Finally, the correlation between volume-sensitive K+/H+ modification and low-affinity labeling suggests that transport activity is associated with a protein of similar to 85 kDa. Although a 55-kDa protein is also labeled, it is a less likely candidate, since label incorporation and transport modification are less well correlated than that of the 85- and 110-kDa proteins. C1 LAWRENCE LIVERMORE NATL LAB, SCH MED, DEPT HUMAN PHYSIOL, DAVIS, CA 95616 USA. UNIV CENT CARIBE, BAYAMON, PR 00960 USA. NR 38 TC 9 Z9 9 U1 0 U2 0 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 USA SN 0363-6143 EI 1522-1563 J9 AM J PHYSIOL-CELL PH JI Am. J. Physiol.-Cell Physiol. PD OCT PY 1994 VL 267 IS 4 BP C1002 EP C1012 PG 11 WC Cell Biology; Physiology SC Cell Biology; Physiology GA PW517 UT WOS:A1994PW51700017 ER PT J AU LEHNERT, BE VALDEZ, YE LEHNERT, NM PARK, MS ENGLEN, MD AF LEHNERT, BE VALDEZ, YE LEHNERT, NM PARK, MS ENGLEN, MD TI STIMULATION OF RAT AND MURINE ALVEOLAR MACROPHAGE PROLIFERATION BY LUNG FIBROBLASTS SO AMERICAN JOURNAL OF RESPIRATORY CELL AND MOLECULAR BIOLOGY LA English DT Article ID TUMOR-NECROSIS-FACTOR; GRANULOCYTE-MACROPHAGE; INFLAMMATORY CELLS; SYNOVIAL FIBROBLASTS; RECEPTOR EXPRESSION; EPITHELIAL-CELLS; BLOOD MONOCYTES; GROWTH-FACTOR; FACTOR CSF-1; FACTOR-ALPHA AB Increases in alveolar macrophage (AM) numbers occur during chronic inflammation and pulmonary fibrosis. Although the underlying mechanism(s) for such increases remain poorly understood, the overall process is known to involve the local proliferation of the AM. In the present study, we report that AM lavaged from the lungs of rats and mice proliferate in vitro when grown atop lung fibroblasts (LF) or when they are cultured in the presence of LF-conditioned media. Using murine AM and LF, we additionally show that the LF-derived mitogenic cytokines for the AM are macrophage colony-stimulating factor (M-CSF) and granulocyte/macrophage colony-stimulating factor (GM-CSF). Our findings suggest that LF, via the production of M-CSF and GM-CSF, may play an important role in regulating the size of the AM population during chronic inflammatory/fibrogenic lung disorders, and that the complex cytokine network that results in pulmonary fibrogenesis may involve a ''coupled reciprocity'' between the lung's AM and LF. RP LEHNERT, BE (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,CELL GROWTH DAMAGE & REPAIR GRP,MS M881,LOS ALAMOS,NM 87545, USA. NR 71 TC 18 Z9 18 U1 0 U2 0 PU AMER LUNG ASSOC PI NEW YORK PA 1740 BROADWAY, NEW YORK, NY 10019 SN 1044-1549 J9 AM J RESP CELL MOL JI Am. J. Respir. Cell Mol. Biol. PD OCT PY 1994 VL 11 IS 4 BP 375 EP 385 PG 11 WC Biochemistry & Molecular Biology; Cell Biology; Respiratory System SC Biochemistry & Molecular Biology; Cell Biology; Respiratory System GA PM600 UT WOS:A1994PM60000002 PM 7917306 ER PT J AU RUSSELL, AA DOUGHTY, DH BALLANTINE, DS HART, R AF RUSSELL, AA DOUGHTY, DH BALLANTINE, DS HART, R TI FREQUENCY AND ATTENUATION RESPONSE OF ACOUSTIC PLATE MODE DEVICES COATED WITH POROUS OXIDE-FILMS SO ANALYTICAL CHEMISTRY LA English DT Article ID WAVE DEVICES AB The response behavior of coated acoustic plate mode (APM) devices upon exposure to ionic solutions was evaluated. The response sensitivity (frequency shifts and attenuation) of APM devices coated with porous oxide films increased by factors of ca. 4-30 compared with an uncoated device upon exposure to ionic solutions. These responses arise predominantly due to acoustoelectric coupling and are consistent with enhanced pore conductivity. A previously derived model for the acoustoelectric response of uncoated APMs is inadequate for predicting the magnitude of coated APM responses and needs to be modified to account for the properties of porous films. Frequency responses are consistent with enhanced conductivity of the solution within the porous coatings. Film porosity, pore size distribution, and film thickness are identified as parameters influencing response sensitivity. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NO ILLINOIS UNIV,DEPT CHEM,DE KALB,IL 60115. NR 21 TC 1 Z9 1 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD OCT 1 PY 1994 VL 66 IS 19 BP 3108 EP 3116 DI 10.1021/ac00091a019 PG 9 WC Chemistry, Analytical SC Chemistry GA PJ928 UT WOS:A1994PJ92800022 ER PT J AU FREYSZ, E DU, Q SHEN, YR AF FREYSZ, E DU, Q SHEN, YR TI SUM-FREQUENCY VIBRATIONNAL SPECTROSCOPY OF WATER-MOLECULES AT INTERFACES SO ANNALES DE PHYSIQUE LA English DT Article; Proceedings Paper CT 2nd Conference on Coherent and Incoherent UV, VUV and X-ray Sources - Applications and Recent Developments CY JUN 13-16, 1994 CL NOUAN FUZELIER, FRANCE SP CNRS, SGDN ID LIQUID VAPOR INTERFACE; SURFACE; ORIENTATION; MONOLAYERS; DYNAMICS AB We present the surface vibrationnal sum frequency spectroscopy technique and we illustrate the ability of this method to analyze the properties of water at different interfaces. We stress the originality of this' spectroscopy to evidence water structure at hydrophobic interfaces and discuss the extension of the sum frequency generation spectroscopy. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT PHYS,DIV MAT SCI,BERKELEY,CA 94720. RP FREYSZ, E (reprint author), UNIV BORDEAUX 1,CTR PHYS MOLEC OPT & HERTZIENNE,351 COURS LIBERAT,F-33405 TALENCE,FRANCE. NR 22 TC 6 Z9 6 U1 0 U2 3 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0003-4169 J9 ANN PHYS-PARIS JI Ann. Phys.-Paris PD OCT PY 1994 VL 19 IS 5 SU S BP 95 EP 102 PG 8 WC Physics, Multidisciplinary SC Physics GA QY682 UT WOS:A1994QY68200025 ER PT J AU SMITH, AB GUENTHER, PT AF SMITH, AB GUENTHER, PT TI FAST-NEUTRON SCATTERING FROM VIBRATIONAL PALLADIUM NUCLEI SO ANNALS OF NUCLEAR ENERGY LA English DT Article ID CROSS-SECTIONS; OPTICAL-MODEL; STATE AB Differential neutron elastic-scattering cross sections are measured from almost-equal-to 1.5 to 10 MeV in sufficient energy and angle detail to define the energy-average behavior. Concurrently, neutron inelastic-scattering cross sections are measured from almost-equal-to 1.5 to 8 MeV. Inelastically-scattered neutron groups are observed corresponding to excitations of: 306 +/- 14, 411 +/- 47, almost-equal-to 494, 791 +/- 20, 924 +/- 20, 1156 +/- 24, 1358 +/- 35, 1554 +/- 47 and 1706 +/- 59 keV, with additional tentative groups at 1938 and 2059 keV. Particular attention is given to the inelastic excitation of the 2+ yrast states of the even isotopes. This broad data base is examined in the context of optical-statistical and coupled-channels models. The resulting model parameters are consistent with systematic trends in this vibrational mass region and provide a suitable vehicle for many applications. C1 UNIV ARIZONA,TUCSON,AZ 85721. RP SMITH, AB (reprint author), ARGONNE NATL LAB,DIV ENGN PHYS,ARGONNE,IL 60439, USA. NR 43 TC 2 Z9 2 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0306-4549 J9 ANN NUCL ENERGY JI Ann. Nucl. Energy PD OCT PY 1994 VL 21 IS 10 BP 629 EP 639 DI 10.1016/0306-4549(94)90072-8 PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PF304 UT WOS:A1994PF30400005 ER PT J AU SCHAFFNER, J DOVER, CB GAL, A GREINER, C MILLENER, DJ STOCKER, H AF SCHAFFNER, J DOVER, CB GAL, A GREINER, C MILLENER, DJ STOCKER, H TI MULTIPLY STRANGE NUCLEAR SYSTEMS SO ANNALS OF PHYSICS LA English DT Article ID HEAVY-ION COLLISIONS; EXCHANGE-POTENTIAL APPROACH; BARYON-BARYON SCATTERING; HYPERON HYPERON INTERACTION; QUARK-MATTER DROPLETS; MEAN-FIELD THEORY; DOUBLE HYPERNUCLEUS; LIGHT HYPERNUCLEI; MODEL; SEPARATION AB We investigate the stability of multiply strange baryonic systems, in the context of a mean field approach obtained from an underlying set of phenomenological meson-baryon interactions. The coupling parameters which determine the conventional sigma + omega mean fields (Hartree potentials) seen by various baryon species (N, LAMBDA, XI) in the many-body system are constrained by reproducing the trend of observed binding energies of single particle (N, LAMBDA, XI) states, as well as the energy per particle and density of non-strange nuclear matter. We also consider additional scalar (sigma*) and vector (phi) fields which couple strongly to strange baryons. The couplings of these fields are adjusted to produce strong hyperon-hyperon interactions, as suggested by the data on LAMBDA LAMBDA hypernuclei. Extrapolating this approach to systems of large strangeness S, we find a broad class of objects composed of neutrons, protons, LAMBDA's and XI's, which are stable against strong decay. In these systems, the presence of filled LAMBDA orbitals blocks the strong decay XI N --> LAMBDA LAMBDA, leading to a strangeness fraction f(s) = \S\/A almost-equal-to 1, density rho almost-equal-to (2 - 3) rho0, and charge fraction f(q) in the range - 0.1 < q/A < 0.1, comparable to that of hypothetical stable strange quark matter (''strangelets''), but with a low binding energy per particle E(B)/A almost-equal-to -10 to -20 MeV. We compare with an approximate mass formula which qualitatively describes the results of the mean field calculations. Such weakly bound multi-strange objects can be stable for very large A, unlike ordinary nuclei, since the Coulomb repulsion generated by the protons is largely cancelled by the presence of a comparable number of XI-'s, leading to a small net charge (positive or negative) of order A1/3. We comment on the weak decays of such subjects and the possibility of their production in relativistic heavy ion collisions. (C) 1994 Academic Press, Inc. C1 JW GOETHE UNIV,INST THEORET PHYS,D-60054 FRANKFURT,GERMANY. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. DUKE UNIV,DEPT PHYS,DURHAM,NC 27706. RP SCHAFFNER, J (reprint author), UNIV WASHINGTON,NATL INST NUCL THEORY,SEATTLE,WA 98195, USA. RI Stoecker, Horst/D-6173-2013 OI Stoecker, Horst/0000-0002-3282-3664 NR 59 TC 228 Z9 236 U1 1 U2 12 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 OCT PY 1994 VL 235 IS 1 BP 35 EP 76 DI 10.1006/aphy.1994.1090 PG 42 WC Physics, Multidisciplinary SC Physics GA PK498 UT WOS:A1994PK49800002 ER PT J AU DEPLANO, P DEVILLANOVA, FA FERRARO, JR MERCURI, ML LIPPOLIS, V TROGU, EF AF DEPLANO, P DEVILLANOVA, FA FERRARO, JR MERCURI, ML LIPPOLIS, V TROGU, EF TI FT-RAMAN STUDY ON CHARGE-TRANSFER POLYIODIDE COMPLEXES AND COMPARISON WITH RESONANCE RAMAN RESULTS SO APPLIED SPECTROSCOPY LA English DT Article DE FT-RAMAN SPECTROSCOPY; RESONANCE RAMAN SPECTROSCOPY; POLYIODIDES ID MOLECULAR-STRUCTURE; CRYSTAL-STRUCTURE; BIS(MORPHOLINOTHIOCARBONYL) DISULFIDE; X-RAY; DIIODINE; SPECTROSCOPY; IODINE; THIONES; SALTS AB In resonance Raman (RR) spectroscopy, the laser excitation sources have often been found to be destructive towards polyiodides if compared with the milder conditions under which the Fourier transform Raman (FT-R) technique operates. In fact, our FT-R spectra of some model polyiodides-[(CH3)(4)N]I-5 (I-5(-) bent), [(C2H5)(4)N]I-7, and [(CH3)(4)N]I-9-are significantly different from the literature RR data, give evidence of decomposition of the samples in RR, and are in agreement, respectively, with the I-.2I(2), I-3(-).2I(2) and (I-.2I(2)).2I(2) descriptions. In addition to the above-cited cases, the FT-R spectra of [Mn(modtc)(3)]I-5 (modtc = morpholine carbodithioato) and [moH]I-5 (moH = morpholinium) are reported. The crystal structures indicate that in these two compounds the I-5(-) anions can be properly described as I-.2I(2) and I-3(-).I-2, respectively, and FT-R spectra agree well with this formulation. Moreover, the first FT-R spectrum of an I-16(4-) anion in ([mo(2)ttl]I-2(16), ([mo(2)ttl](2+) = 3,5-di(N-morpholinio)-1,2,4-trithiolane), whose X-ray structure shows a sequence of two I-3(-)... I-2... I-.I-2 (I-8(2-)) interacting anions, is reported. A close correlation of the PT-Raman peaks with the molecular species, identified by the interatomic distances, is also observed in this case. Thus, a combination of X-ray structural data and FT-R data can provide a reasonable interpretation of the nature of the acceptor iodine moiety in charge-transfer polyiodide complexes. C1 ARGONNE NATL LAB,ARGONNE,IL 60176. RP DEPLANO, P (reprint author), UNIV CAGLIARI,DIPARTIMENTO CHIM & TECNOL INORGAN & MET ORGA,VIA OSPED 72,I-09124 CAGLIARI,ITALY. OI LIPPOLIS, VITO/0000-0001-8093-576X NR 29 TC 50 Z9 51 U1 0 U2 5 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA PO BOX 1438, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD OCT PY 1994 VL 48 IS 10 BP 1236 EP 1241 DI 10.1366/0003702944027372 PG 6 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA PQ696 UT WOS:A1994PQ69600009 ER PT J AU STOREY, JME SHELTON, RD BARBER, TE WACHTER, EA AF STOREY, JME SHELTON, RD BARBER, TE WACHTER, EA TI ELECTROCHEMICAL SERS DETECTION OF CHLORINATED HYDROCARBONS IN AQUEOUS-SOLUTIONS SO APPLIED SPECTROSCOPY LA English DT Article DE SURFACE-ENHANCED RAMAN SPECTROSCOPY; SERS; ELECTROCHEMICAL SERS; COPPER ELECTRODE; IN SITU METHODS; TCE; CHLORINATED HYDROCARBONS ID ENHANCED RAMAN-SPECTROSCOPY; SURFACE; ELECTRODES; SENSOR; WATER AB An in situ method for the determination of trichloroethylene (TCE), perchloroethylene (PCE), chloroform (CHCl3), and carbon tetrachloride (CCl4) in aqueous solution is described. The method is based on ESERS-a combination of electrochemical methods and surface-enhanced Raman scattering (SERS). Electrochemistry prepares the surface of a copper electrode for SERS and concentrates the analyte on the surface. The formation of common reaction products for chloroalkanes and for chloroalkenes prevents unequivocal differentiation within a specific class of chlorinated hydrocarbons. However, spectroscopic selectivity between the chloroalkane and chloroalkene classes is excellent, while differences in electrochemical response provide a secondary means for differentiating analyte class. Sensitivity was found to be: <1 ppm for TCE; 15 ppm for PCE; 15 ppm for CHCl3; and 10 ppm for CCl4. Application of the method to groundwater contaminated with TCE has been demonstrated. In combination with a fiber-optic waveguide, the ESERS technique offers potential for remote detection of chlorinated hydrocarbons in groundwater and remediation process streams. C1 OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831. NR 12 TC 14 Z9 14 U1 1 U2 5 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA PO BOX 1438, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD OCT PY 1994 VL 48 IS 10 BP 1265 EP 1271 DI 10.1366/0003702944027417 PG 7 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA PQ696 UT WOS:A1994PQ69600013 ER PT J AU OCHIAI, S MCCLELLAND, JF KOBAYASHI, K TAKAOKA, K AF OCHIAI, S MCCLELLAND, JF KOBAYASHI, K TAKAOKA, K TI OBSERVATION OF FT-IR PHOTOACOUSTIC AND FT-IR PHOTOACOUSTIC REFLECTION-ABSORPTION SPECTRA OF LANGMUIR-BLODGETT-FILMS ON A METAL-SUBSTRATE SO APPLIED SPECTROSCOPY LA English DT Note DE FT-IR/PHOTOACOUSTIC; PHOTOACOUSTIC-RAS; LB FILM ID INFRARED-SPECTROSCOPY; CADMIUM ARACHIDATE; ORIENTATION; IR; MONOLAYERS; ALUMINUM C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. MUSASHI INST TECHNOL,DEPT CHEM,SETAGAYA KU,TOKYO 158,JAPAN. NR 9 TC 2 Z9 2 U1 0 U2 0 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA PO BOX 1438, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD OCT PY 1994 VL 48 IS 10 BP 1287 EP 1289 DI 10.1366/0003702944027426 PG 3 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA PQ696 UT WOS:A1994PQ69600018 ER PT J AU MALEY, MP CHO, JH FLESHLER, S BULAEVSKII, LN AF MALEY, MP CHO, JH FLESHLER, S BULAEVSKII, LN TI ANISOTROPIC TRANSPORT-PROPERTIES OF BSCCO SINGLE-CRYSTALS AND AG-CLAD TAPES IN HIGH MAGNETIC-FIELDS SO APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 7th Conference on Superconductivity and Applications CY SEP 07-09, 1994 CL NEW YORK INST SUPERCONDUCT, BUFFALO, NY SP New York State Inst Superconduct HO NEW YORK INST SUPERCONDUCT ID MODEL; SUPERCONDUCTOR; BI2SR2CACU2O8; FILMS; STATE AB We report measurements of resistivity and critical current density on single crystals of Bi-2212 with current flow both parallel and perpendicular to the CuO2 planes and in magnetic fields to 18 T. For comparison, similar measurements were performed on samples of Bi-2223 tape conductors with the Ag cladding removed. For current flow along the c-axis of the crystals the semiconducting behavior (resistivity increasing with decreasing temperature) is extended to below 50 K in a field of 18 T, followed by a sharp transition to the superconducting state. From I-V curves of c-axis transport we extract the magnetic field and temperature dependencies of the interlayer critical current density J(c,c) and define a decoupling line H-D(T) above which J(c,c) vanishes. H-D(T) lies close to but above the irreversibility H-irr(T) obtained from magnetic measurements. We also observe a decoupling induced below H-D(T) by the application of a magnetic field starting from the zero field cooled state, ZFC. The resulting ''pancake vortex'' density gradient causes a loss of c-axis phase coherence and produces a c-axis resistance that relaxes logarithmically with time as the magnetization decays. These results are contrasted with similar measurements performed on highly textured Bi-2223 tapes. For current flow along the tape normal (nominal c-axis) the resistivity is metallic and its temperature and field dependence scales with those for in-plane current flow. Similarly critical currents for the two directions show similar field and orientation dependence. These results are consistent with predominant percolative current paths along crystallographic ab planes even for transport normal to the tape plane. RP MALEY, MP (reprint author), LOS ALAMOS NATL LAB,CTR SUPERCONDUCTOR TECHNOL,MS-K763,LOS ALAMOS,NM 87545, USA. NR 18 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 0964-1807 J9 APPL SUPERCOND JI Appl. Supercond. PD OCT-DEC PY 1994 VL 2 IS 10-12 BP 667 EP 675 DI 10.1016/0964-1807(94)90065-5 PG 9 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA RE624 UT WOS:A1994RE62400009 ER PT J AU ZASADZINSKI, J CHEN, J ROMANO, P GRAY, KE WAGNER, JL HINKS, DG AF ZASADZINSKI, J CHEN, J ROMANO, P GRAY, KE WAGNER, JL HINKS, DG TI DEVICE-QUALITY TUNNEL-JUNCTIONS ON THE HIGH-T-C SUPERCONDUCTOR HGBA2CUO4+DELTA SO APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 7th Conference on Superconductivity and Applications CY SEP 07-09, 1994 CL NEW YORK INST SUPERCONDUCT, BUFFALO, NY SP New York State Inst Superconduct HO NEW YORK INST SUPERCONDUCT ID MIXERS; GHZ AB SIN and SIS tunnel junction device (e.g. photon detectors, logic elements) require quasiparticle characteristics that exhibit sharp current onsets at the gap voltage and very low sub-gap conductances. Progress is reported on the development of such junctions on high-T-c cuprates using mechanical point contacts. In general, these contacts display the optimum characteristics that can be obtained from HTS native-surface tunnel barriers. Most cuprates display a sub-gap conductance which monotonically increases with voltage about the minimum value at zero bias. However, tunneling data of unusually high quality have been obtained for the recently discovered Hg-based cuprate, HgBa2CuO4 (T-c = 96 K). SIS' tunneling data using a Nb tip are presented which exhibit very low and flat sub-gap conductances and sharp conductance peaks as expected from a BCS density of states. These results are slightly improved over earlier published results with SIN junctions. Use of the experimental data to simulate the performance of a quasiparticle mixer demonstrates that noise temperatures approaching the quantum limit are possible for SIS and SIN mixers in the range 1-5 THz. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP ZASADZINSKI, J (reprint author), IIT,SCI & TECHNOL CTR SUPERCOND,DEPT PHYS,CHICAGO,IL 60616, USA. NR 15 TC 3 Z9 3 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0964-1807 J9 APPL SUPERCOND JI Appl. Supercond. PD OCT-DEC PY 1994 VL 2 IS 10-12 BP 709 EP 714 PG 6 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA RE624 UT WOS:A1994RE62400014 ER PT J AU TRAN, TT CHAMBERS, SA AF TRAN, TT CHAMBERS, SA TI AUGER AND X-RAY PHOTOELECTRON DIFFRACTION IN MGO(001) SO APPLIED SURFACE SCIENCE LA English DT Article ID ENERGY ELECTRON-DIFFRACTION; SURFACE-STRUCTURE; MGO(100) SURFACE; RELAXATION; LEED; GEOMETRY; RHEED; ICISS; MGO AB A new method for preparing the MgO(001) surface is introduced. AlKalpha-excited, angular distributions of MgKL2,3L2,3 Auger, Mg 1s, and O 1s core-level photoemission intensities were measured. We show that high-kinetic-energy MgKL2,3L2,3 Auger and O 1s photoelectron diffraction patterns are strongly dependent upon the atomic numbers of atoms neighboring the emitter. The physical cause for this result is the inherent differences in the elastic scattering cross sections of Mg and O. In addition, we show that low-kinetic-energy Mg 1s photoelectron diffraction patterns are sensitive to input atomic charges and radii, in contrast to the behavior observed for their high-energy counterparts. RP TRAN, TT (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 31 TC 9 Z9 9 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 OCT PY 1994 VL 81 IS 2 BP 161 EP 173 DI 10.1016/0169-4332(94)00169-3 PG 13 WC Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Chemistry; Materials Science; Physics GA PK160 UT WOS:A1994PK16000007 ER PT J AU SHIRAZI, MA ROBIDEAUX, ML KAPUSTKA, LA WAGNER, JJ REPORTER, MC AF SHIRAZI, MA ROBIDEAUX, ML KAPUSTKA, LA WAGNER, JJ REPORTER, MC TI CELL-GROWTH IN PLANT CULTURES - AN INTERPRETATION OF THE INFLUENCE OF INITIAL WEIGHT IN CADMIUM AND COPPER TOXICITY TESTS SO ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY LA English DT Article ID ZINC AB An approach is presented for conducting and interpreting results of newly established plant cell culture in toxicity studies. Extended culturing produces uniform suspension and facilitates sampling. Primary (new) cultures are more representative of responses of their plant species but produce nonuniform suspension due to clumping and clumping presents unavoidable sampling difficulties. Evaluations were made of the response of plant cell suspension in primary cultures subjected to metal stress in three differente experiment. Sampling and data interpretation were examined in detail, using mathematical models. Cells were selected from callus cultures of Medicago sativa and green Mandevilla pohliana for experiments using copper and from non-green Mandevilla pohliana for an experiment using cadmium. Distributions of as many as 21 elements in soluble and cell-residue compartments were determined. The interaction of treatment with copper and element distribution was emphasized. Culture status was traced microscopically and growth measured as change in cell fresh weight. The initial weight of each culture replicate could not be held constant due to non-uniform suspension. A mathematical model that described the interactions of the initial weight, exposure time, and metal concentrations was developed to analyze the data. The model revealed stimulation of cell growth when subjected to low concentration of copper and no-growth stimulation with low or moderate concentrations of cadmium. This finding resolves some of the confusion in the literature relative to the effect of low doses of cadmium. C1 OREGON STATE UNIV, CORVALLIS, OR 97331 USA. US EPA, ENVIRONM RES LAB, CORVALLIS, OR 97333 USA. MANTECH ENVIRONM TECHNOL INC, ENVIRONM RES LAB, CORVALLIS, OR 97333 USA. ECOL PLANNING & TOXICOL INC, CORVALLIS, OR 97333 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 13 TC 0 Z9 0 U1 2 U2 3 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0090-4341 J9 ARCH ENVIRON CON TOX JI Arch. Environ. Contam. Toxicol. PD OCT PY 1994 VL 27 IS 3 BP 331 EP 337 PG 7 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA PD585 UT WOS:A1994PD58500008 ER PT J AU NEWMAN, MC MULVEY, M BEEBY, A HURST, RW RICHMOND, L AF NEWMAN, MC MULVEY, M BEEBY, A HURST, RW RICHMOND, L TI SNAIL (HELIX-ASPERSA) EXPOSURE HISTORY AND POSSIBLE ADAPTATION TO LEAD AS REFLECTED IN SHELL COMPOSITION SO ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY LA English DT Article ID METAL; SITES; WATER AB Lead sequestration in shell was examined for English and Welsh populations of the common garden snail (Helix aspersa) with different Pb exposure histories. Isotopic Pb ratios provided signatures for Pb source and a means of implying duration of population exposure from decades to millennia. Total Pb concentrations were used to quantify the intensity of exposure experienced by the populations. Snails from populations with long histories of exposure (millennia) to high Pb levels had proportionately more Pb in their shell than soft tissue compared with snails from other surveyed populations. These observations suggest that Pb sequestration in shell has been enhanced in H. aspersa populations with long and intense exposure to Pb. C1 S BANK UNIV, SCH APPL SCI, LONDON SE1 0AA, ENGLAND. CHEMPET RES CORP, MOORPARK, CA 93021 USA. RP NEWMAN, MC (reprint author), UNIV GEORGIA, SAVANNAH RIVER ECOL LAB, AIKEN, SC 29803 USA. NR 21 TC 23 Z9 25 U1 1 U2 1 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0090-4341 J9 ARCH ENVIRON CON TOX JI Arch. Environ. Contam. Toxicol. PD OCT PY 1994 VL 27 IS 3 BP 346 EP 351 PG 6 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA PD585 UT WOS:A1994PD58500010 ER PT J AU MORTIMER, BC REDGRAVE, TG SPANGLER, EA VERSTUYFT, JG RUBIN, EM AF MORTIMER, BC REDGRAVE, TG SPANGLER, EA VERSTUYFT, JG RUBIN, EM TI EFFECT OF HUMAN APOE4 ON THE CLEARANCE OF CHYLOMICRON-LIKE LIPID EMULSIONS AND ATHEROGENESIS IN TRANSGENIC MICE SO ARTERIOSCLEROSIS AND THROMBOSIS LA English DT Article DE CHYLOMICRON REMNANTS; APO E ISOFORMS; CHOLESTEROL; LDL RECEPTOR; TRIGLYCERIDE LIPOLYSIS ID DENSITY-LIPOPROTEIN-RECEPTOR; DETERMINING ATHEROSCLEROSIS SUSCEPTIBILITY; TRIACYLGLYCEROL-RICH LIPOPROTEINS; HERITABLE HYPERLIPIDEMIC RABBITS; APOLIPOPROTEIN-E POLYMORPHISM; SPORADIC ALZHEIMERS-DISEASE; AMYLOID-BETA-PEPTIDE; PLASMA-LIPOPROTEINS; INBRED STRAINS; HEPATIC LIPASE AB Apolipoprotein (apo) E is a ligand for lipoprotein receptors and mediates the cellular uptake of several different lipoproteins. Human apoE occurs in three allelic forms designated E2, E3, and E4. The E2 isoform is associated with changes in lipoprotein metabolism, and the E4 isoform is associated with Alzheimer's disease and an increased risk of coronary heart disease. In this study transgenic mice were generated to assess the effect of a sustained increase in plasma apoE4 concentration. The transgenic animals had three- to sixfold increases in total plasma apoE, associated primarily with the non-high-density lipoprotein (HDL) fractions of plasma lipoproteins. In response to an atherogenic diet the transgenic mice developed hypercholesterolemia similar to that in nontransgenic mice but did not experience the decrease in HDL cholesterol normally observed in this strain of C57BL/6 mice. The rate of plasma clearance of a lipid emulsion mimicking lymph chylomicrons was measured in transgenic mice expressing the human apoE4 gene and compared with the clearance rate in nontransgenic control animals. In animals fed a low-fat diet the emulsion lipids were cleared significantly more rapidly from the plasma of transgenic than control mice. In animals adapted to a high-fat diet, the clearance of chylomicron remnants was slowed markedly in both transgenic and control mice and was not significantly accelerated in transgenic compared with control animals. We also investigated the effect of increasing the plasma concentration of apoE4 on the progression of atherosclerotic heart disease. The extent of fatty streak lesion formation in transgenic mice expressing apoE4 was compared with nontransgenic controls. Fatty streak lesion area in the apoE4 transgenic mice was significantly decreased compared with controls. Thus, an elevated plasma concentration of human apoE4 can attenuate murine atherogenesis by a mechanism perhaps associated with changes in the response of HDL to an atherogenic diet. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA. RP MORTIMER, BC (reprint author), UNIV WESTERN AUSTRALIA,DEPT PHYSIOL,NEDLANDS,WA 6009,AUSTRALIA. NR 76 TC 20 Z9 21 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 1049-8834 J9 ARTERIOSCLER THROMB JI Arterioscler. Thromb. PD OCT PY 1994 VL 14 IS 10 BP 1542 EP 1552 PG 11 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA PL394 UT WOS:A1994PL39400004 PM 7918303 ER PT J AU WINTERS, JM FLEISCHER, AJ GAUGER, A AF WINTERS, JM FLEISCHER, AJ GAUGER, A TI CIRCUMSTELLAR DUST SHELLS AROUND LONG-PERIOD VARIABLES .2. THEORETICAL LIGHTCURVES OF C-STARS SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE HYDRODYNAMICS; RADIATIVE TRANSFER; STARS, CARBON; CIRCUMSTELLAR MATTER ID BRIGHT CARBON STARS; MU-M RANGE; MASS-LOSS; STELLAR WINDS; ATMOSPHERES; GROWTH; EVAPORATION; EVOLUTION; ENVELOPES; MODELS AB Theoretical lightcurves of long-period and Mira variables are presented. Based on dynamical models of circumstellar dust shells (CDS), which include time-dependent hydrodynamics and a detailed treatment of the processes of formation, growth and evaporation of carbon grains, frequency-dependent radiative transfer calculations have been carried out which yield the synthetic infrared lightcurves of these dust shell models. It turns out that the discrete structure of the CDS due to the periodic formation of new dust layers decisively influences the shape of the lightcurves by producing e.g. intermediate extrema. This is demonstrated in detail for one model. Furthermore, dust shell models are presented whose lightcurves exhibit the superposition of two different oscillations: The oscillation with the period of the interior pulsation is superposed by an oscillation with a longer period which is produced by the dynamical structure of the CDS. Similar features are present in observed lightcurves, which indicates that our, nevertheless preliminary, modelling approach shows promise for interpreting the optical appearance of Miras and long-period variables. C1 INST ASTRON & ASTROPHYS, D-10623 BERLIN, GERMANY. LOS ALAMOS NATL LAB, GRP T4, LOS ALAMOS, NM 87545 USA. NR 53 TC 86 Z9 87 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD OCT PY 1994 VL 290 IS 2 BP 623 EP 633 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PM605 UT WOS:A1994PM60500030 ER PT J AU Sigl, G Schramm, DN Bhattacharjee, P AF Sigl, G. Schramm, D. N. Bhattacharjee, P. TI On the origin of highest energy cosmic rays SO ASTROPARTICLE PHYSICS LA English DT Article AB In this paper we show that the conventional diffusive shock acceleration mechanism for cosmic rays associated with relativistic astrophysical shocks in active galactic nuclei (AGNs) has severe difficulties to explain the highest energy cosmic ray events. We show that protons above around 2 x 10(20) eV could have marginally been produced by this mechanism in an AGN or a rich galaxy cluster not further away than around 100 Mpc. However, for the highest energy Fly's Eye and Yakutsk events this is inconsistent with the observed arrival directions. Galactic and intergalactic magnetic fields appear unable to alter the direction of such energetic particles by more than a few degrees. We also discuss some other options for these events associated with relativistic particles including pulsar acceleration of high Z nuclei. At the present stage of knowledge the concept of topological defects left over from the early universe as the source for such events appears to be a promising option. Such sources are discussed and possible tests of this hypothesis are proposed. C1 [Sigl, G.; Schramm, D. N.] Univ Chicago, Enrico Fermi Inst, Dept Astron & Astrophys, Chicago, IL 60637 USA. [Sigl, G.; Schramm, D. N.] NASA, Fermilab Astrophys Ctr, Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. [Bhattacharjee, P.] Indian Inst Astrophys, Bangalore 560034, Karnataka, India. RP Sigl, G (reprint author), Univ Chicago, Enrico Fermi Inst, Dept Astron & Astrophys, Chicago, IL 60637 USA. FU NSF at the University of Chicago; NASA at the University of Chicago; DOE at the University of Chicago; DOE; NASA at Fermi lab [NAGW 2381]; Alexander-von-Humboldt Foundation FX We would like to thank James Cronin, Eugene Parker, Hongyue Dai, Stirling Colgate, Gene Loh, Cy Hoffman, Corbin Covault, Felix Aharonian, Arnold Wolfendale and Bob Nichol for highly valuable discussions. In addition, we are grateful to Paul Sommers and Rene Ong for their suggestions concerning the manuscript. Furthermore, we thank the editor Tom Gaisser and the referee for various points brought to our attention. We would also like to thank Chris Hill for his collaboration in earlier papers dealing with topological defects and his enthusiastic contributions to this topic. This work has been supported, in part, by NSF, NASA and the DOE at the University of Chicago, by the DOE and by NASA through grant NAGW 2381 at Fermi lab and by the Alexander-von-Humboldt Foundation. NR 76 TC 122 Z9 123 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-6505 J9 ASTROPART PHYS JI Astropart Phys. PD OCT PY 1994 VL 2 IS 4 BP 401 EP 414 DI 10.1016/0927-6505(94)90029-9 PG 14 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA V26DQ UT WOS:000208526700007 ER PT J AU KOGUT, A BANDAY, AJ BENNETT, CL HINSHAW, G LOEWENSTEIN, K LUBIN, P SMOOT, GF WRIGHT, EL AF KOGUT, A BANDAY, AJ BENNETT, CL HINSHAW, G LOEWENSTEIN, K LUBIN, P SMOOT, GF WRIGHT, EL TI SEARCH FOR UNRESOLVED SOURCES IN THE CODE-DMR 2-YEAR SKY MAPS SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC MICROWAVE BACKGROUND; RADIO CONTINUUM; GENERAL ID DIFFERENTIAL MICROWAVE RADIOMETER; MILLIMETER CONTINUUM MEASUREMENTS; DEGREE ANGULAR SCALES; BACKGROUND-RADIATION; ANISOTROPY AB We have searched the temperature maps from the COBE Differential Microwave Radiometers (DMR) first two years of data for evidence of unresolved sources. The high-latitude sky (Absolute value of b > 30-degrees) contains no sources brighter than 192 muK thermodynamic temperature (322 Jy at 53 GHz). The cumulative count of sources brighter than threshold T, N(>T), is consistent with a superposition of instrument noise plus scale-invariant spectrum of cosmic temperature fluctuations normalized to Q(rms-PS) = 17 muK. We examine the temperature maps toward nearby clusters and find no evidence for any Sunyaev-Zel'dovich effect, DELTAy < 7.3 x 10(-6) (95% CL) averaged over the DMR beam. We examine the temperature maps near the brightest expected radio sources and detect no evidence of significant emission. The lack of bright unresolved sources in the DMR maps, taken with anisotropy measurements on smaller angular scales, places a weak constraint on the integral number density of any unresolved Planck-spectrum sources brighter than flux density S, n(>S) < 2 x 10(4) (S/1 jy)-2 sr-1. C1 NASA, GODDARD SPACE FLIGHT CTR, GSFC, UNIV SPACE RES ASSOC, GREENBELT, MD 20771 USA. UCSB, DEPT PHYS, SANTA BARBARA, CA 93106 USA. UNIV CALIF LOS ANGELES, DEPT ASTRON, LOS ANGELES, CA 90024 USA. UNIV CALIF BERKELEY, SSL, LBL, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, CFPA, BERKELEY, CA 94720 USA. RP KOGUT, A (reprint author), NASA, GODDARD SPACE FLIGHT CTR, GSFC, HUGHES STX CORP, CODE 685 3, GREENBELT, MD 20771 USA. RI Kogut, Alan/D-6293-2012 NR 24 TC 14 Z9 14 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 1 PY 1994 VL 433 IS 2 BP 435 EP 439 DI 10.1086/174655 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PJ925 UT WOS:A1994PJ92500001 ER PT J AU DODELSON, S STEBBINS, A AF DODELSON, S STEBBINS, A TI ANALYSIS OF SMALL-SCALE MICROWAVE BACKGROUND-RADIATION ANISOTROPY IN THE PRESENCE OF FOREGROUND CONTAMINATION SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC MICROWAVE BACKGROUND; COSMOLOGY, THEORY; LARGE-SCALE STRUCTURE OF UNIVERSE ID RADIOMETER AB Many of the current round of experiments searching for anisotroPies in the microwave background radiation (MBR) are confronting the problem of how to disentangle the cosmic signal from contamination due to Galactic and intergalactic foreground sources. Here we show how commonly used likelihood function techniques can be generalized to account for foreground. Specifically we set some restrictions on the spectrum of foreground contamination but allow the amplitude to vary arbitrarily. The likelihood function thus generalized gives reasonable limits on the MBR anisotropy which, in some cases, are not much less restrictive than what one would get from more detailed modeling of the foreground. Furthermore, the likelihood function is exactly the same as one would obtain by simply projecting out foreground contamination and looking at the reduced data set. We apply this generalized analysis to the recent medium-angle data sets of ACME-HEMT (Gaier et al. 1992; Schuster et al. 1993) and MAX (Meinhold et al. 1993; Gunderson et al. 1993). The resulting analysis constrains the one free parameter in the standard cold dark matter theory to be Q(rms-ps) = 18(-5)+8 muK. This best fit value, although in striking agreement with the normalization from COBE, is not a very good fit, with an overall chi2/degrees of freedom = 208/168. We also argue against three commonly used methods of dealing with foreground: (1) ignoring it completely; (2) subtracting off a best-fit foreground and treating the residuals as if uncontaminated; and (3) culling data which appears to be contaminated by foreground. RP DODELSON, S (reprint author), NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 13 TC 23 Z9 23 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 1 PY 1994 VL 433 IS 2 BP 440 EP 453 DI 10.1086/174656 PN 1 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PJ925 UT WOS:A1994PJ92500002 ER PT J AU TREVESE, D KRON, RG MAJEWSKI, SR BERSHADY, MA KOO, DC AF TREVESE, D KRON, RG MAJEWSKI, SR BERSHADY, MA KOO, DC TI THE ENSEMBLE VARIABILITY PROPERTIES OF FAINT QSOS SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, DISTANCES AND REDSHIFTS; GALAXIES, PHOTOMETRY; QUASARS, GENERAL ID HIGH-REDSHIFT QUASARS; OPTICAL VARIABILITY; MULTICOLOR PHOTOMETRY; LUMINOSITY FUNCTION; COMPLETE SAMPLE; RADIO-SOURCES; CATALOG; GALAXIES; FIELD; OBJECTS AB A refined sample of 64 variable objects with stellar image structure has been identified in SA 57 to B approximately 22.5, over a time baseline of 15 yr, sampled at 11 distinct epochs. The photometric data typically have a root-mean-square error at B = 22 of only 0.05 mag. Thirty-five quasars in this field have already been spectroscopically confirmed, 34 of which are among the sample of variables. Of the other variables, six are known spectroscopically to be stars, 10 additional objects are stars based on reliable detection of proper motion, and one is spectroscopically a narrow emission line galaxy. Of the 13 remaining variables, it is argued that they are a mixture of distant halo subdwarfs and quasars with starlike colors. We compute the ensemble average structure function and autocorrelation function from the light curves in the respective quasar rest frames, which are used to investigate the general dependences on apparent magnitude, absolute magnitude, and redshift. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. OBSERV CARNEGIE INST WASHINGTON,PASADENA,CA 91101. UNIV CALIF SANTA CRUZ OBSERV,LICK OBSERV,BOARD STUDIES ASTRON & ASTROPHYS,SANTA CRUZ,CA 95064. RP TREVESE, D (reprint author), UNIV ROMA LA SAPIENZA,VIA GM LANCISI 29,IST ASTRON,I-00161 ROME,ITALY. OI Koo, David/0000-0003-3385-6799 NR 27 TC 88 Z9 89 U1 2 U2 4 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 1 PY 1994 VL 433 IS 2 BP 494 EP 509 DI 10.1086/174661 PN 1 PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PJ925 UT WOS:A1994PJ92500007 ER PT J AU MACLOW, MM MCKEE, CF KLEIN, RI STONE, JM NORMAN, ML AF MACLOW, MM MCKEE, CF KLEIN, RI STONE, JM NORMAN, ML TI SHOCK INTERACTIONS WITH MAGNETIZED INTERSTELLAR CLOUDS .1. STEADY SHOCKS HITTING NONRADIATIVE CLOUDS SO ASTROPHYSICAL JOURNAL LA English DT Article DE HYDRODYNAMICISM, MAGNETIC FIELDS; MHD; SHOCK WAVES; SUPERNOVA REMNANTS ID TURBULENT MIXING LAYERS; SUPERNOVA REMNANT; CASSIOPEIA-A; GAS CLOUDS; HYDRODYNAMICS; DESTRUCTION; MODEL; WAVE AB We study the interaction of a steady, planar shock with a nonradiative, spherical, interstellar cloud threaded by a uniform magnetic field. For strong shocks, the sonic Mach number scales out, so two parameters determine the evolution: the ratio of cloud to intercloud density, and the Alfven Mach number. We focus on the case with initial field parallel to the shock velocity, though we also present one model with field perpendicular to the velocity. Even with 100 zones per cloud radius, we find that the magnetic field structure converges only at early times. However, we can draw three conclusions from our work. First, our results suggest that the inclusion of a field in equipartition with the preshock medium can prevent the complete destruction of the cloud found in the field-free case recently considered by Klein, McKee, & Colella. Second, the interaction of the shock with the cloud can amplify the magnetic field in some regions up to equipartition with the postshock thermal pressure. In the parallel-field case, the shock preferentially amplifies the parallel component of the field, creating a ''flux rope,'' a linear structure of concentrated magnetic field. The flux rope dominates the volume of amplified field, so that laminar, rather than turbulent, amplification is dominant in this case. Third, the presence of the cloud enhances the production of X-ray and synchrotron emission. The X-ray emission peaks early, during the initial passage of the shock over the cloud, while the synchrotron emission peaks later, when the flow sweeps magnetic field onto the axis between the cloud and the main shock. C1 UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720. UNIV ILLINOIS,NATL CTR SUPERCOMP APPLICAT,URBANA,IL 61801. UNIV ILLINOIS,DEPT ASTRON,URBANA,IL 61801. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CHICAGO,CTR ASTRON & ASTROPHYS,5640 S ELLIS AVE,CHICAGO,IL 60637. OI Mac Low, Mordecai-Mark/0000-0003-0064-4060 NR 38 TC 113 Z9 113 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 OCT 1 PY 1994 VL 433 IS 2 BP 757 EP 777 DI 10.1086/174685 PN 1 PG 21 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PJ925 UT WOS:A1994PJ92500031 ER PT J AU CLAPP, AC DEVLIN, MJ GUNDERSEN, JO HAGMANN, CA HRISTOV, VV LANGE, AE LIM, M LUBIN, PM MAUSKOPF, PD MEINHOLD, PR RICHARDS, PL SMOOT, GF TANAKA, ST TIMBIE, PT WUENSCHE, CA AF CLAPP, AC DEVLIN, MJ GUNDERSEN, JO HAGMANN, CA HRISTOV, VV LANGE, AE LIM, M LUBIN, PM MAUSKOPF, PD MEINHOLD, PR RICHARDS, PL SMOOT, GF TANAKA, ST TIMBIE, PT WUENSCHE, CA TI MEASUREMENTS OF ANISOTROPY IN THE COSMIC MICROWAVE BACKGROUND-RADIATION AT DEGREE ANGULAR SCALES NEAR THE STARS SIGMA HERCULIS AND IOTA DRACONIS SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC MICROWAVE BACKGROUND; COSMOLOGY, OBSERVATIONS ID RADIATION AB We present results from two four-frequency observations centered near the stars Sigma Herculis and Iota Draconis during the fourth flight of the Millimeter-wave Anisotropy eXperiment (MAX). The observations were made of 6-degrees x 0.6-degrees strips of the sky with a 1.4-degrees peak to peak sinusoidal chop in all bands. The FWHM beam sizes were calculated 0.55-degrees + 0.05-degrees at 3.5 cm-1 and a 0.75-degrees + 0.05-degrees, at 6, 9, and 14 cm-1. Significant correlated structures were observed at 3.5, 6, and 9 cm-1. The spectra of these signals are inconsistent with thermal emission from known interstellar dust populations. The extrapolated amplitudes of synchrotron and free-free emission are too small to account for the amplitude of the observed structures. If the observed structures are attributed to CMB anisotropy with a Gaussian autocorrelation function and a coherence angle of 25', then the most probable values at DELTAT/T(CMB) = 3.1(+1.7/-1.3) x 10(-5) for the Sigma Herculis scan, and DELTAT/T(CMB) = 3.3(-1.1/+1.1) x 10(-5) for the Iota Draconis scan (95% confidence upper, lower limits). C1 INST NACL PESQUISAS ESPACIAIS,MCT,DEPT ASTROFIS,BR-12200 S JOSE CAMPOS,SP,BRAZIL. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. LAWRENCE BERKELEY LAB,DIV PHYS,BERKELEY,CA 94720. BROWN UNIV,DEPT PHYS,PROVIDENCE,RI 02912. RP CLAPP, AC (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 16 TC 33 Z9 33 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 OCT 1 PY 1994 VL 433 IS 2 BP L57 EP L60 DI 10.1086/187547 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PJ927 UT WOS:A1994PJ92700002 ER PT J AU SMITH, SC CENTRELLA, JM CLANCY, SP AF SMITH, SC CENTRELLA, JM CLANCY, SP TI A 3-DIMENSIONAL HYDRODYNAMICS CODE FOR MODELING SOURCES OF GRAVITATIONAL-RADIATION SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article DE GRAVITATION; HYDRODYNAMICS; METHODS, NUMERICAL; RADIATION MECHANISMS, NONTHERMAL ID BLACK-HOLE ACCRETION; EQUATIONS; POLYTROPES; COLLAPSE; SYSTEMS AB We have developed a three-dimensional Eulerian hydrodynamics code to model sources of gravitational radiation. The code is written in cylindrical coordinates (pi, z, phi) and has moving grids in the pi- and z-directions. We use Newtonian gravity and calculate the gravitational radiation in the quadrupole approximation. This code has been tested on a variety of problems to verify its accuracy and stability, and the results of these tests are reported here. C1 DREXEL UNIV,DEPT PHYS & ATMOSPHER SCI,PHILADELPHIA,PA 19104. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 38 TC 6 Z9 6 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0067-0049 J9 ASTROPHYS J SUPPL S JI Astrophys. J. Suppl. Ser. PD OCT PY 1994 VL 94 IS 2 BP 789 EP 823 DI 10.1086/192090 PG 35 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PH224 UT WOS:A1994PH22400011 ER PT J AU MARCOCCI, L MAGUIRE, JJ PACKER, L AF MARCOCCI, L MAGUIRE, JJ PACKER, L TI NITECAPONE - A NITRIC-OXIDE RADICAL SCAVENGER SO BIOCHEMISTRY AND MOLECULAR BIOLOGY INTERNATIONAL LA English DT Article ID SUPEROXIDE-DISMUTASE; INHIBITION; OXIDATION; RELEASE; ANION; RAT C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. RP MARCOCCI, L (reprint author), UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,MEMBRANE BIOCHEM GRP,229 STANLEY HALL,BERKELEY,CA 94720, USA. NR 32 TC 18 Z9 18 U1 0 U2 0 PU ACADEMIC PRESS AUST PI MARRICKVILLE PA LOCKED BAG 16, MARRICKVILLE NSW 2204, AUSTRALIA SN 1039-9712 J9 BIOCHEM MOL BIOL INT JI Biochem. Mol. Biol. Int. PD OCT PY 1994 VL 34 IS 3 BP 531 EP 541 PG 11 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA PN626 UT WOS:A1994PN62600012 PM 7833830 ER PT J AU BRECHER, G AF BRECHER, G TI UNTITLED SO BRITISH JOURNAL OF HAEMATOLOGY LA English DT Letter RP BRECHER, G (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0007-1048 J9 BRIT J HAEMATOL JI Br. J. Haematol. PD OCT PY 1994 VL 88 IS 2 BP 444 EP 444 DI 10.1111/j.1365-2141.1994.tb05054.x PG 1 WC Hematology SC Hematology GA PL812 UT WOS:A1994PL81200044 PM 7695725 ER PT J AU YOUNG, CJ CHAEL, EP ZAGAR, DA CARTER, JA AF YOUNG, CJ CHAEL, EP ZAGAR, DA CARTER, JA TI VARIATIONS IN NOISE AND SIGNAL LEVELS IN A PAIR OF DEEP BOREHOLES NEAR AMARILLO, TEXAS SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Article ID FREQUENCY SEISMIC NOISE; EASTERN KAZAKHSTAN; ATTENUATION; CALIFORNIA; MOTION; DEPTH AB To better understand the depth dependence of improvements in signal-to-noise ratio for borehole seismic data, we have collected and analyzed a data set recorded from a pair of high-fidelity, broadband (1 to 80 Hz) seismometers sited in two closely separated deep boreholes near Amarillo, Texas. The total decrease (surface to 1951 m) in minimum noise level is up to 30 dB; the total decrease in maximum noise level is up to 35 dB; and the range of noise values (maximum to minimum) at a given depth decreases from 30 to 10 dB. The majority of the noise reduction occurs within the first few hundred meters below the surface, but the decrease continues with depth and there is no indication that even lower noise levels do not exist below our deepest recording depth (1951 m). Cultural work-day noise (prominent during normal working hours) from 0 to 40 Hz is observed at all depths, suggesting a strong body-wave component. Wind-generated 15 to 60-Hz noise is strongest at the surface, and is observed as deep as 367 m without a properly shielded hole. With the addition of shielding to reduce the coupling between the borehole casing and/ or cable with the wind, wind-generated noise above 40 Hz can be eliminated at 367 m. Events with near-vertical propagation paths and signal power above 1 Hz show signal strength decreasing uphole, with a steady winnowing of high frequencies that can be fit by a simple frequency-independent Q of 35.5 +/- 8 for the material between 1951 and 367 m. C1 SANDIA NATL LABS,DIV 9232,ALBUQUERQUE,NM 87185. CTR SEISM STUDIES,ARLINGTON,VA 22209. RP YOUNG, CJ (reprint author), SANDIA NATL LABS,DIV 6116,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 18 TC 8 Z9 8 U1 1 U2 1 PU SEISMOLOGICAL SOC AMER PI EL CERRITO PA PLAZA PROFESSIONAL BLDG, SUITE 201, EL CERRITO, CA 94530 SN 0037-1106 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD OCT PY 1994 VL 84 IS 5 BP 1593 EP 1607 PG 15 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA QW649 UT WOS:A1994QW64900021 ER PT J AU JONES, RH SHARITZ, RR JAMES, SM DIXON, PM AF JONES, RH SHARITZ, RR JAMES, SM DIXON, PM TI TREE POPULATION-DYNAMICS IN 7 SOUTH-CAROLINA MIXED-SPECIES FORESTS SO BULLETIN OF THE TORREY BOTANICAL CLUB LA English DT Article DE FOREST SUCCESSION; INGROWTH; MORTALITY; SHADE TOLERANCE; POPULATION FLUX AB Seven 1-ha plots were established in second-growth, mixed-species forests across a soil moisture gradient in the Coastal Plain of South Carolina. All trees in the plots were tagged in 1979 and measured in 1979 and 1989 to determine 10-yr recruitment of trees greater than or equal to 4.5 cm DBH (ingrowth) and mortality. Ingrowth to mortality ratios and sums of ingrowth plus mortality were used to quantify shade tolerance and successional status of individual species. In all plots, small stem density decreased and large stem density increased, an indication that the forests were in mid-successional phases where competition is expected to be intense. Shade tolerant species, especially small tree life forms, had the greatest ratios of ingrowth to mortality. Large differences in population flux, even among shade tolerant species, indicated that different mechanisms can account for increases in populations of late-succesional species. Within some species, ratios of ingrowth to mortality varied significantly across the gradient reflecting flooding or soil moisture effects on succession. C1 SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. UNIV GEORGIA,DEPT BOT,ATHENS,GA 30602. BERRY COLL,DEPT BIOL,ROME,GA 30149. RP JONES, RH (reprint author), AUBURN UNIV,SCH FORESTRY,108 M WHITE SMITH HALL,AUBURN,AL 36849, USA. NR 25 TC 15 Z9 15 U1 0 U2 4 PU TORREY BOTANICAL CLUB PI BRONX PA NEW YORK BOTANICAL GARDEN, BRONX, NY 10458 SN 0040-9618 J9 B TORREY BOT CLUB JI Bull. Torrey Bot. Club PD OCT-DEC PY 1994 VL 121 IS 4 BP 360 EP 368 DI 10.2307/2997010 PG 9 WC Plant Sciences SC Plant Sciences GA PZ745 UT WOS:A1994PZ74500005 ER PT J AU ELLSWORTH, DS LIU, X AF ELLSWORTH, DS LIU, X TI PHOTOSYNTHESIS AND CANOPY NUTRITION OF 4 SUGAR MAPLE FORESTS ON ACID SOILS IN NORTHERN VERMONT SO CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE LA English DT Article ID ACER-SACCHARUM; QUEBEC APPALACHIANS; GAS-EXCHANGE; DECLINE; NUTRIENT; STANDS; DIEBACK; CALCIUM; GROWTH; PLANTS AB Canopy nutrition, leaf chlorophyll concentration, and leaf CO2 assimilation capacity (A(max)) were examined in sugar maple (Acer saccharum Marsh.) trees exhibiting symptoms of crown dieback in four stands on acid soils (pH approximate to 4.0) in northern Vermont. Leaf CO2 assimilation capacity was measured on foliage from detached and rehydrated branches harvested from the upper portion of the canopy. Leaf calcium (Ca) and magnesium (Mg) concentrations were among the lowest reported for sugar maple in its natural range. Total leaf chlorophyll concentrations of canopy leaves were lowest on the sites exhibiting the lowest leaf nitrogen (N) and Ca, and CO2 assimilation capacity was correlated with chlorophyll concentration among canopy leaves from all sites. Strong linear relationships were observed between leaf CO2 assimilation capacity per unit leaf mass and leaf N (r(2) = 0.60) as well as leaf Ca (r(2) = 0.51) among the four sites. On the basis of the observed strong correlation between leaf Ca and leaf N (r(2) = 0.64) and the lack of clear enhancement of leaf CO2 assimilation capacity in trees fertilized with base cations (K, Ca, and Mg), it appears that leaf CO2 assimilation capacity and leaf Ca may not necessarily be functionally related. However, since low leaf CO2 assimilation capacity and photosynthetic N-use efficiency were common in unfertilized trees with low Ca (Ca < 0.6%), CO2 assimilation processes in sugar maple on acid soils may be limited by N and Ca X Mg interactions. The strongly acidic nature of the soils in these stands and the magnitude of acidic deposition in the region may precondition sugar maple trees on some sites to levels of cation deficiency that may be associated with low CO2 assimilation in the forest canopy. C1 UNIV VERMONT,DEPT BOT,BURLINGTON,VT 05405. UNIV VERMONT,PROCTOR MAPLE RES CTR,BURLINGTON,VT 05405. RP ELLSWORTH, DS (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV BIOSYST & PROC SCI,UPTON,NY 11973, USA. NR 57 TC 42 Z9 43 U1 1 U2 10 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0045-5067 J9 CAN J FOREST RES JI Can. J. For. Res.-Rev. Can. Rech. For. PD OCT PY 1994 VL 24 IS 10 BP 2118 EP 2127 DI 10.1139/x94-272 PG 10 WC Forestry SC Forestry GA QB752 UT WOS:A1994QB75200018 ER PT J AU DUNKELBERG, O HAAS, A KLAPDOR, MF MOOTZ, D POLL, W APPELMAN, EH AF DUNKELBERG, O HAAS, A KLAPDOR, MF MOOTZ, D POLL, W APPELMAN, EH TI OXIDATION REACTIONS WITH HOF AND ADDUCTS OF HOF AND HF WITH ACETONITRILE SO CHEMISCHE BERICHTE LA German DT Article DE OXIDATION BY HOF; HYPOFLUOROUS ACID; ADDITION COMPOUNDS OF HOF AND HF WITH ACETONITRILE ID HYPOFLUOROUS ACID; FLUORIDES AB In acetonitrile solution HOF oxides CF3SSCF3 via CF3S(O)(n)SCF3 (n = 1, 2) to yield [CF3S(O)2]2O. Analogously, CF3Se(O)OH and CF3SeX (X = Cl, Br) are oxidized via CF3Se(VI) intermediates to provide finally [CF3Se(O)2]2O. With CH3CN at low temperatures HOF and HF form 1:1 adducts, whose structures have been elucidated by low-temperature X-ray structure analysis. Additional proof for the formation of CH3CN . HF in the liquid phase is provided. C1 RUHRUNIV BOCHUM,LEHRSTUHL ANORGAN CHEM 2,D-44780 BOCHUM,GERMANY. UNIV DUSSELDORF,INST ANORGAN CHEM & STRUKTURCHEM,D-40225 DUSSELDORF,GERMANY. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. NR 17 TC 20 Z9 21 U1 0 U2 3 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0009-2940 J9 CHEM BER JI Chem. Berichte PD OCT PY 1994 VL 127 IS 10 BP 1871 EP 1875 DI 10.1002/cber.19941271009 PG 5 WC Chemistry, Multidisciplinary SC Chemistry GA PM547 UT WOS:A1994PM54700008 ER PT J AU VARADARAJ, K SKINNER, DM AF VARADARAJ, K SKINNER, DM TI CYTOPLASMIC LOCALIZATION OF TRANSCRIPTS OF A COMPLEX G+C-RICH CRAB SATELLITE DNA SO CHROMOSOMA LA English DT Article ID LAMPBRUSH LOOPS NOOSES; Y-CHROMOSOME LOOPS; DROSOPHILA-HYDEI; REPETITIVE SEQUENCES; HETEROCHROMATIC DNA; MOLECULAR-STRUCTURE; NEWT NOTOPHTHALMUS; SEX DETERMINATION; GENUS TRITURUS; PAIR NOOSES AB The primary sequence and higher order structures of a G-C-rich satellite DNA of the Bermuda land crab Gecarcinus lateralis have been described previously. The repeat unit of the satellite is approximately 2.1 kb. In exploring a possible function for this satellite, we asked whether it is transcribed. As a probe for transcripts, we used a segment of DNA amplified from a 368 bp EcoRI fragment from the very highly conserved 3' end of the satellite DNA. During polymerase chain reaction (PCR) amplification, the probe was simultaneously either radiolabeled or biotinylated. Tissue- and stage specific transcripts were observed when blots of poly(A)+ mRNAs recovered from polysomes isolated from crab tissues [including midgut gland (hepatopancreas), limb bud, and claw muscle] were probed with the satellite DNA fragment. The presence of satellite transcripts in polysomal mRNAs is strong evidence that the transcripts had reached the cytoplasm. To corroborate the presence of transcripts in the cytoplasm, we investigated in situ hybridization of satellite probes with RNAs in tissue sections. Biotinylated satellite DNA probes were applied to sections of midgut gland, limb bud papilla, ovary, or testis of anecdysial crabs. Retention of RNAs in tissue sections was improved by UV-irradiation prior to hybridization. Transcripts were abundant in the cytoplasm of all tissues except testis. Sections of crab midgut gland treated with RNase A prior to hybridization and sections of mouse pancreatic tumor served as controls; neither showed any signals with the probe. C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. E TENNESSEE STATE UNIV,DEPT BIOPHYS,JOHNSON CITY,TN 37614. NR 63 TC 16 Z9 16 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0009-5915 J9 CHROMOSOMA JI Chromosoma PD OCT PY 1994 VL 103 IS 6 BP 423 EP 431 PG 9 WC Biochemistry & Molecular Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Genetics & Heredity GA PT815 UT WOS:A1994PT81500007 PM 7859563 ER PT J AU HUGHES, SD ROUY, D NAVARA, N SCOTT, J RUBIN, EM AF HUGHES, SD ROUY, D NAVARA, N SCOTT, J RUBIN, EM TI INTRODUCTION OF APOLIPOPROTEIN-B MESSENGER-RNA EDITING FACTOR P27 INCREASES IN-VIVO HEPATIC APO-B EDITING IN RABBITS AND MICE SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. HAMMERSMITH HOSP,LONDON W12 0HS,ENGLAND. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1994 VL 90 IS 4 BP 1 EP 1 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA PN417 UT WOS:A1994PN41700045 ER PT J AU BIELICKI, JK FORTE, TM RAHIM, Z MCCALL, MR AF BIELICKI, JK FORTE, TM RAHIM, Z MCCALL, MR TI OXIDIZED LDL IS A POTENT INHIBITOR OF PLASMA LECITHIN-CHOLESTEROL ACYLTRANSFERASE SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1994 VL 90 IS 4 BP 32 EP 32 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA PN417 UT WOS:A1994PN41700199 ER PT J AU WILLIAMS, PT DREON, DM KRAUSS, RM AF WILLIAMS, PT DREON, DM KRAUSS, RM TI THE EFFECTS OF DIETARY-FAT ON HDL SUBCLASSES ARE AFFECTED BY BOTH APO E ISOFORMS AND LDL SUBCLASS PATTERN SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1994 VL 90 IS 4 BP 74 EP 74 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA PN417 UT WOS:A1994PN41700435 ER PT J AU STOLTZFUS, LJ GONG, EL BRION, CM MURUGESH, D RUBIN, EM AF STOLTZFUS, LJ GONG, EL BRION, CM MURUGESH, D RUBIN, EM TI CONTRASTING IN-VIVO EFFECTS OF HUMAN AND MURINE APOLIPOPROTEIN AII ON HDL ARE NOT ATTRIBUTABLE TO THE QUATERNARY STRUCTURAL DIFFERENCE SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1994 VL 90 IS 4 BP 81 EP 81 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA PN417 UT WOS:A1994PN41700467 ER PT J AU FRANCONE, OL GONG, EL COOPER, P FIELDING, CJ RUBIN, EM AF FRANCONE, OL GONG, EL COOPER, P FIELDING, CJ RUBIN, EM TI EXPRESSION OF HUMAN LECITHIN-CHOLESTEROL ACYLTRANSFERASE IN TRANSGENIC MICE - STUDIES ON SUBSTRATE-SPECIFICITY SO CIRCULATION LA English DT Meeting Abstract C1 UNIV CALIF SAN FRANCISCO,CARDIOVASC RES INST,SAN FRANCISCO,CA 94143. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1994 VL 90 IS 4 BP 82 EP 82 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA PN417 UT WOS:A1994PN41700474 ER PT J AU TRIBBLE, DL VANVENROOIJ, F GONG, EL NICHOLS, AV AF TRIBBLE, DL VANVENROOIJ, F GONG, EL NICHOLS, AV TI USE OF A NONEXCHANGEABLE PROBE TO MONITOR PARTICLE-SPECIFIC OXIDATION-KINETICS IN MIXED SYSTEMS - EVIDENCE THAT HIGH-DENSITY-LIPOPROTEIN (HDL) INHIBITS LOW-DENSITY-LIPOPROTEIN (LDL) OXIDATION BY FECL3 WITHOUT SIMULTANEOUS OXIDATION SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1994 VL 90 IS 4 BP 136 EP 136 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA PN417 UT WOS:A1994PN41700763 ER PT J AU BENOIT, P HUGHES, S VIGNE, E VERSTUYFT, J PERRICAUDET, M DENEFLE, PP RUBIN, EM AF BENOIT, P HUGHES, S VIGNE, E VERSTUYFT, J PERRICAUDET, M DENEFLE, PP RUBIN, EM TI APOLIPOPROTEIN-A-I RECOMBINANT ADENOVIRUSES - EFFECTS ON LIPOPROTEINS AND ATHEROGENESIS IN MICE SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RHONE POULENC RORER SA,CRVA,VITRY,FRANCE. INST GUSTAVE ROUSSY,F-94805 VILLEJUIF,FRANCE. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1994 VL 90 IS 4 BP 240 EP 240 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA PN417 UT WOS:A1994PN41701322 ER PT J AU CASTRO, GR NIHOUL, L DENGREMONT, C TAILLEUX, A DUVERGER, N DENEFLE, P RUBIN, EM RYFRUCHART, JC AF CASTRO, GR NIHOUL, L DENGREMONT, C TAILLEUX, A DUVERGER, N DENEFLE, P RUBIN, EM RYFRUCHART, JC TI PLASMA FROM HUMAN APOAI AND APOAI PLUS APOAII TRANSGENIC MICE SHOW A CORRELATION BETWEEN IN-VIVO ATHEROGENESIS, IN-VITRO CHOLESTEROL EFFLUX, AND FORMATION OF LIPOPROTEINS WITH PRE-BETA MOBILITY SO CIRCULATION LA English DT Meeting Abstract C1 INST PASTEUR,U325,LILLE,FRANCE. RHONE POULENC RORER,VITRY,FRANCE. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1994 VL 90 IS 4 BP 240 EP 240 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA PN417 UT WOS:A1994PN41701324 ER PT J AU TRIBBLE, DL THIEL, PM COOK, NE VANDENBERG, JJM KRAUSS, RM AF TRIBBLE, DL THIEL, PM COOK, NE VANDENBERG, JJM KRAUSS, RM TI ENHANCED OXIDATIVE LABILITY OF VITAMIN-E IN SMALL, DENSE VERSUS LARGE, BUOYANT LDL PARTICLES SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. CHILDRENS HOSP,RES INST,OAKLAND,CA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1994 VL 90 IS 4 BP 409 EP 409 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA PN417 UT WOS:A1994PN41702228 ER PT J AU KRAUSS, RM STAMPFER, MJ BLANCHE, PJ HOLL, LG MA, J HENNKENS, CH AF KRAUSS, RM STAMPFER, MJ BLANCHE, PJ HOLL, LG MA, J HENNKENS, CH TI A PROSPECTIVE-STUDY OF LDL PARTICLE DIAMETER AND RISK OF MYOCARDIAL-INFARCTION SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 12 Z9 12 U1 0 U2 1 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1994 VL 90 IS 4 BP 460 EP 460 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA PN417 UT WOS:A1994PN41702503 ER PT J AU MILLER, BD CASHINHEMPHILL, L MACK, WJ HODIS, HN KRAUSS, RM AF MILLER, BD CASHINHEMPHILL, L MACK, WJ HODIS, HN KRAUSS, RM TI PREDOMINANCE OF MID-DENSITY LOW-DENSITY LIPOPROTEINS PREDICTS ANGIOGRAPHIC BENEFIT OF LOVASTATIN IN THE MONITORED ATHEROSCLEROSIS REGRESSION STUDY SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV SO CALIF,LOS ANGELES,CA 90089. NR 0 TC 9 Z9 9 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1994 VL 90 IS 4 BP 460 EP 460 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA PN417 UT WOS:A1994PN41702504 ER PT J AU SUPERKO, HR WOOD, PD KRAUSS, RM AF SUPERKO, HR WOOD, PD KRAUSS, RM TI OPPOSITE EFFECTS OF ALPHA AND BETA-ADRENERGIC BLOCKERS ON LDL SUBCLASS DISTRIBUTION IN HYPERTENSIVE SUBJECTS SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. STANFORD UNIV,STANFORD,CA 94305. SEQUOIA HOSP,REDWOOD CITY,CA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1994 VL 90 IS 4 BP 471 EP 471 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA PN417 UT WOS:A1994PN41702565 ER PT J AU WILLIAMS, PT AF WILLIAMS, PT TI LIPOPROTEINS AND ADIPOSITY SHOW IMPROVEMENT AT SUBSTANTIALLY HIGHER EXERCISE LEVELS THAN THOSE CURRENTLY RECOMMENDED SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 2 Z9 2 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1994 VL 90 IS 4 BP 471 EP 471 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA PN417 UT WOS:A1994PN41702566 ER PT J AU SUPERKO, HR AF SUPERKO, HR TI EFFECT OF NICOTINIC-ACID ON LDL SUBCLASS PATTERNS SO CIRCULATION LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,SEQUOIA HOSP,REDWOOD CITY,CA. NR 0 TC 9 Z9 9 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1994 VL 90 IS 4 BP 504 EP 504 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA PN417 UT WOS:A1994PN41702744 ER PT J AU ROTTER, JI BU, XD CANTOR, RM WARDEN, CH BROWN, J GRAY, RJ BLANCHE, PJ KRAUSS, RM LUSIS, AJ AF ROTTER, JI BU, XD CANTOR, RM WARDEN, CH BROWN, J GRAY, RJ BLANCHE, PJ KRAUSS, RM LUSIS, AJ TI MULTIPLE GENES DETERMINE LDL PARTICLE-SIZE PHENOTYPE IN CORONARY-ARTERY DISEASE FAMILIES SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. UNIV CALIF LOS ANGELES, LOS ANGELES, CA USA. CEDARS SINAI MED CTR, LOS ANGELES, CA 90048 USA. NR 0 TC 2 Z9 2 U1 0 U2 1 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1994 VL 90 IS 4 BP 509 EP 509 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA PN417 UT WOS:A1994PN41702771 ER PT J AU HODIS, HN MACK, WJ CASHINHEMPHILL, L KRAUSS, RM AF HODIS, HN MACK, WJ CASHINHEMPHILL, L KRAUSS, RM TI DIFFERENTIAL EFFECT OF LIPOPROTEINS ON CORONARY-ARTERY LESION PROGRESSION SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV SO CALIF,LOS ANGELES,CA 90089. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1994 VL 90 IS 4 BP 532 EP 532 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA PN417 UT WOS:A1994PN41702898 ER PT J AU FRAZER, KA NARLA, G ZHANG, JL RUBIN, EM AF FRAZER, KA NARLA, G ZHANG, JL RUBIN, EM TI A 270 KB YEAST ARTIFICIAL CHROMOSOME CONTAINING APOLIPOPROTEIN(A) APPROPRIATELY EXPRESSES IN TRANSGENIC MICE SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1994 VL 90 IS 4 BP 624 EP 624 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA PN417 UT WOS:A1994PN41703391 ER PT J AU WING, NR GEE, GW AF WING, NR GEE, GW TI QUEST FOR THE PERFECT CAP SO CIVIL ENGINEERING LA English DT Article C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP WING, NR (reprint author), WESTINGHOUSE HANFORD CO, RICHLAND, WA 99352 USA. NR 0 TC 18 Z9 18 U1 0 U2 0 PU ASCE-AMER SOC CIVIL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2398 SN 0885-7024 J9 CIVIL ENG JI Civil Eng. PD OCT PY 1994 VL 64 IS 10 BP 38 EP 41 PG 4 WC Engineering, Civil SC Engineering GA PJ983 UT WOS:A1994PJ98300012 ER PT J AU VANELST, H LIDSEY, JE TAVAKOL, R AF VANELST, H LIDSEY, JE TAVAKOL, R TI QUANTUM COSMOLOGY AND HIGHER-ORDER LAGRANGIAN THEORIES SO CLASSICAL AND QUANTUM GRAVITY LA English DT Article ID INFLATIONARY UNIVERSE; GENERAL-RELATIVITY; HIGHER DERIVATIVES; 4TH-ORDER GRAVITY; CREATION; MODELS; STATE; LIMIT AB In this paper the quantum cosmological consequences of introducing a term cubic in the Ricci curvature scalar R into the Einstein-Hilbert action are investigated. It is argued that this term represents a more generic perturbation to the action than the quadratic correction usually considered. A qualitative argument suggests that there exists a region of parameter space in which neither the tunnelling nor the no-boundary boundary conditions predict an epoch of inflation that can solve the horizon and flatness problems of the standard big bang model. This is in contrast to the R(2)-theory. C1 FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. RP VANELST, H (reprint author), UNIV LONDON QUEEN MARY & WESTFIELD COLL,SCH MATH SCI,MILE END RD,LONDON E1 4NS,ENGLAND. NR 37 TC 18 Z9 18 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 OCT PY 1994 VL 11 IS 10 BP 2483 EP 2497 PG 15 WC Astronomy & Astrophysics; Physics, Multidisciplinary; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PP746 UT WOS:A1994PP74600008 ER PT J AU MENDELSOHN, R ROSENBERG, NJ AF MENDELSOHN, R ROSENBERG, NJ TI FRAMEWORK FOR INTEGRATED ASSESSMENTS OF GLOBAL WARMING IMPACTS SO CLIMATIC CHANGE LA English DT Article ID CARBON-DIOXIDE; CLIMATE-CHANGE; WATER-USE; TEMPERATURE; GREENHOUSE; COTTON; BUDGET; YIELD; SINKS; SCALE AB This paper provides a framework for integrated assessment of the impacts of climate change on natural resources and sets the stage for papers that follow in this volume. Integrated assessments are used to organize large quantities of technical information bearing on complex issues (environmental and others) in ways that facilitate application of the information in decision making and policy setting. Any integrated assessment must be based on the best available information. For that reason this paper includes a 'primer' on the current (and presumably best available) understanding of the science underlying climatic change. The remainder of the paper describes the component parts of one possible framework for integrated assessment. C1 PACIFIC NW LAB, Richland, WA 99352 USA. RP MENDELSOHN, R (reprint author), YALE UNIV, SCH FORESTRY & ENVIRONM STUDIES, NEW HAVEN, CT 06511 USA. NR 48 TC 24 Z9 41 U1 0 U2 4 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 OCT PY 1994 VL 28 IS 1-2 BP 15 EP 44 DI 10.1007/BF01094099 PG 30 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA PQ757 UT WOS:A1994PQ75700002 ER PT J AU DALE, VH RAUSCHER, HM AF DALE, VH RAUSCHER, HM TI ASSESSING IMPACTS OF CLIMATE-CHANGE ON FORESTS - THE STATE OF BIOLOGICAL MODELING SO CLIMATIC CHANGE LA English DT Review ID EASTERN NORTH-AMERICA; TERRESTRIAL ECOSYSTEMS; REGIONAL APPLICATIONS; SUCCESSION MODEL; ECOLOGICAL RISK; CARBON BALANCE; GENERAL-MODEL; GLOBAL CHANGE; TREE GROWTH; SOIL AB Models that address the impacts of climate change on forests are reviewed at four levels of biological organization: global, regional or landscape, community, and tree. The models are compared for their ability to assess changes in fluxes of biogenic greenhouse gases, land use, patterns of forest type or species composition, forest resource productivity, forest health, biodiversity, and wildlife habitat. No one model can address all of these impacts, but landscape transition models and regional vegetation and land-use models have been used to consider more impacts than the other models. The development of landscape vegetation dynamics models of functional groups is suggested as a means to integrate the theory of both landscape ecology and individual tree responses to climate change. Risk assessment methodologies can be adapted to deal with the impacts of climate change at various spatial and temporal scales. Four areas of research needing additional effort are identified: (1) linking socioeconomic and ecologic models; (2) interfacing forest models at different scales; (3) obtaining data on susceptibility of trees and forest to changes in climate and disturbance regimes; and (4) relating information from different scales. C1 US FOREST SERV,SE FOREST EXPT STN,ASHEVILLE,NC 28806. RP DALE, VH (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. RI Dale, Virginia/B-6023-2009 NR 104 TC 27 Z9 29 U1 0 U2 8 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 OCT PY 1994 VL 28 IS 1-2 BP 65 EP 90 DI 10.1007/BF01094101 PG 26 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA PQ757 UT WOS:A1994PQ75700004 ER PT J AU FREDERICK, KD GOKLANY, IM ROSENBERG, NJ AF FREDERICK, KD GOKLANY, IM ROSENBERG, NJ TI CONCLUSIONS, REMAINING ISSUES, AND NEXT STEPS SO CLIMATIC CHANGE LA English DT Article AB The workshop focused on methodologies to assess the impacts of climate change on terrestrial and aquatic ecosystems and their socioeconomic consequences. It did not deal in any detail with the other components (i.e., models designed to estimate changes in atmospheric concentrations of greenhouse gases or in climatic factors) of an integrated assessment shown in Figure 2 of the introduction. This final chapter discusses some of the issues addressed during the San Diego workshop and highlights a few of the major findings of the papers. Issues discussed below include limitations of past modeling efforts and impediments to developing better models of the impacts of climate change on forest, grassland, and water resources; suggestions for future research both to develop better data and models and to employ existing data and modeling capabilities to improve the usefulness of climate impact assessments for policy purposes; and the need for developing a common assessment framework. C1 US DEPT INTERIOR, WASHINGTON, DC 20024 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP FREDERICK, KD (reprint author), RESOURCES FUTURE INC, 1616 P ST NW, WASHINGTON, DC 20036 USA. NR 13 TC 2 Z9 2 U1 0 U2 0 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 OCT PY 1994 VL 28 IS 1-2 BP 209 EP 219 DI 10.1007/BF01094107 PG 11 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA PQ757 UT WOS:A1994PQ75700010 ER PT J AU KELLER, JO BARR, PK GEMMEN, RS AF KELLER, JO BARR, PK GEMMEN, RS TI PREMIXED COMBUSTION IN A PERIODIC-FLOW FIELD .1. EXPERIMENTAL INVESTIGATION SO COMBUSTION AND FLAME LA English DT Article ID SPEED DUMP COMBUSTOR; PULSE COMBUSTION; CHARACTERISTIC TIMES; TAIL-PIPE AB An experimental investigation into the detailed mixing, combustion and ignition processes occurring in a how field under the influence of resonant acoustic perturbations has been performed. These acoustic perturbations were created by a pulse combustor of the ''Helmholtz'' type. Cycle-resolved ensemble-averaged measurements of the velocity field, combined with instantaneous images of chemiluminescence and of schlieren, are presented. During the first two-thirds of the resonant cycle the inlet jet forms a well-defined toroidal vortex that is phase-locked with the combustor cycle. This toroidal vortex is responsible for the convection and mixing of the reactants with the residual hot products. Although chemiluminescence is always present in quiescent regions of the combustor, none exists in the region of the reactants during injection. Moreover, the combustion of the fresh reactants begins late in the cycle along the outer edges of the rolled up toroidal vortex, and not in the quiescent regions of the flow. The combustion of the reactants moves into the center of this toroidal vortex where rapid uniform ignition and subsequent combustion of the fresh reactants occurs. This flow field is dominated by a strong toroidal vortex which entrains on a large scale and mixes on a fine scale the fresh reactants with the residual hot products, preparing them for a rapid, almost volumetric, combustion process initiated by thermal and/or radical ignition. C1 UNIV MICHIGAN,ANN ARBOR,MI 48109. RP KELLER, JO (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. NR 28 TC 23 Z9 24 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 OCT PY 1994 VL 99 IS 1 BP 29 EP 42 DI 10.1016/0010-2180(94)90080-9 PG 14 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA PH996 UT WOS:A1994PH99600003 ER PT J AU BARR, PK KELLER, JO AF BARR, PK KELLER, JO TI PREMIXED COMBUSTION IN A PERIODIC-FLOW FIELD .2. THE IMPORTANCE OF FLAME EXTINCTION BY FLUID DYNAMIC STRAIN SO COMBUSTION AND FLAME LA English DT Article ID SPEED DUMP COMBUSTOR; PULSE COMBUSTION; CHARACTERISTIC TIMES AB A numerical model has been developed to study the importance of flame extinction by fluid dynamic strain that occurs during premixed combustion in an oscillating flow field. This is the second of a pair of papers that reports on the fundamental mechanisms that ensure the correct phase relation between the energy release and the resonant pressure waves, which is required by Rayleigh's criterion for stable oscillations. The axisymmetric model is based on the vortex dynamics method combined with a flame sheet algorithm. The model is used to demonstrate that flame extinction by fluid dynamic stretch plays a dominant role in delaying reaction until later in the cycle. Without the extinction mechanism significant energy release occurs during the peak of injection, at a time when experimental observation shows it proceeds through a minimum. Additionally, the predicted rate of energy release decreases as the reactant injection rate decreases, but the experimental observation shows an increase in the energy release rate at this cycle time. By including extinction due to stretch in the flame model the onset of ignition of the fresh reactants is significantly delayed, giving much better agreement with the experimental data. Results are presented that show that the effect due to flame extinction by stretch dominates the effects due to either the expansion of the reactants as they burn or the shape of the injection profile. These results also show that although reactants injected during one cycle may still be burning during the next cycle, they are not the source of ignition for the subsequent cycles. This implies that the ignition mechanism is either thermal or radical, or both. Although the flow field studied here is from a pulse combustor, the conclusions are applicable to combustor configurations where a large vortical structure is formed during injection of reactants. RP BARR, PK (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. NR 31 TC 11 Z9 11 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 OCT PY 1994 VL 99 IS 1 BP 43 EP 52 DI 10.1016/0010-2180(94)90081-7 PG 10 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA PH996 UT WOS:A1994PH99600004 ER PT J AU SCHEFER, RW NAMAZIAN, M KELLY, J AF SCHEFER, RW NAMAZIAN, M KELLY, J TI STABILIZATION OF LIFTED TURBULENT-JET FLAMES SO COMBUSTION AND FLAME LA English DT Article ID DIFFUSION FLAMES; SCATTERING AB Planar imaging measurements of CH, CH4, and temperature are used to evaluate current models for flame stabilization in lifted, turbulent CH4-jet flames. The experimental system consists of two cameras that simultaneously record the instantaneous distributions of species concentration and temperature. Measurements were made in two flames with fuel-jet Reynolds numbers of 7,000 and 12,100. The results show that the fuel and air are premixed and within the CH4 flammability limits at the flame stabilization point. The flame zone also falls considerably outside the region where scalar dissipation is significant (dissipation levels are well below the critical value for extinction). It is concluded that local stoichiometry, and not scalar dissipation, is the primary factor controlling flame stability. Considerable interaction exists between the large-scale structure associated with the central fuel jet and the instantaneous flame zone, which is consistent with both premixed flame propagation and the concept of large-scale motion resulting in the ignition of unreacted fuel by hot combustion products. C1 ALTEX TECHNOL CORP,SANTA CLARA,CA 95054. RP SCHEFER, RW (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. RI Schefer, Jurg/G-3960-2012 NR 22 TC 78 Z9 79 U1 1 U2 4 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 OCT PY 1994 VL 99 IS 1 BP 75 EP 86 DI 10.1016/0010-2180(94)90083-3 PG 12 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA PH996 UT WOS:A1994PH99600006 ER PT J AU DIMES, LE GARCIACARRENO, FL HAARD, NF AF DIMES, LE GARCIACARRENO, FL HAARD, NF TI ESTIMATION OF PROTEIN DIGESTIBILITY .3. STUDIES ON THE DIGESTIVE ENZYMES FROM THE PYLORIC CECA OF RAINBOW-TROUT AND SALMON SO COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-PHYSIOLOGY LA English DT Article DE PROTEIN DIGESTION; DIGESTIVE ENZYMES; SALMON; RAINBOW TROUT ID TRYPSIN; PROTEASES; FEED; FISH; PURIFICATION; INHIBITION AB Digestive proteinases were isolated and partially purified from the pyloric ceca of trout and salmon. Their stability and some catalytic properties were compared with those of a three-enzyme system that is used for determination of in vitro protein digestibility. In contrast to the three-enzyme system, pyloric ceca trypsin and total proteinase activity were least stable at pH values below 5.0 and most stable under alkaline conditions up to pH 10.0. Thermal inactivation (50%) occurred in 60 min at 55 degrees C for trypsin activity of trout and salmon ceca proteinases and at 40 degrees C for the three-enzyme system at the pH (8.0) of the in vitro assay. Thermal inactivation (50%) of total proteinase activity occurred in 60 min at about 55, 50 and 35 degrees C for chinook, trout and three-enzyme preparations, respectively. SDS-PAGE zymograms of the ceca enzymes showed the presence of several proteolytic activity bands. Two of the bands corresponded in molecular weight to trypsin and chymotrypsin. Ceca proteinases differ from the three-enzyme system in their response to inhibitors; in particular, the ceca proteinases are much more sensitive to soybean trypsin inhibitor than the procine trypsin used in the three-enzyme system when assayed for trypsin, but less sensitive when assayed for total proteinase. The distinctive properties of ceca enzymes help explain why they are more appropriate than the three-enzyme system, and other enzyme cocktails for in vitro protein digestibility assay of salmonid feed components. C1 LAWRENCE LIVERMORE NATL LAB, INST MARINE RESOURCES, DEPT FOOD SCI & TECHNOL, DAVIS, CA 95616 USA. NR 36 TC 48 Z9 52 U1 0 U2 8 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0300-9629 J9 COMP BIOCHEM PHYS A JI Comp. Biochem. Physiol. A-Physiol. PD OCT PY 1994 VL 109 IS 2 BP 349 EP 360 DI 10.1016/0300-9629(94)90138-4 PG 12 WC Biochemistry & Molecular Biology; Physiology; Zoology SC Biochemistry & Molecular Biology; Physiology; Zoology GA PJ471 UT WOS:A1994PJ47100017 ER PT J AU WILSON, GV GORDA, B LU, P AF WILSON, GV GORDA, B LU, P TI 12 WAYS TO MAKE SURE YOUR PARALLEL PROGRAMMING SYSTEM DOESNT MAKE OTHERS LOOK BAD SO COMPUTER LA English DT Editorial Material C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV TORONTO,TORONTO,ON,CANADA. RP WILSON, GV (reprint author), VRIJE UNIV AMSTERDAM,AMSTERDAM,NETHERLANDS. 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 0018-9162 J9 COMPUTER JI Computer PD OCT PY 1994 VL 27 IS 10 BP 112 EP 112 PG 1 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA PK654 UT WOS:A1994PK65400021 ER PT J AU CHOI, JY DONGARRA, JJ WALKER, DW AF CHOI, JY DONGARRA, JJ WALKER, DW TI PUMMA - PARALLEL UNIVERSAL MATRIX MULTIPLICATION ALGORITHMS ON DISTRIBUTED-MEMORY CONCURRENT COMPUTERS SO CONCURRENCY-PRACTICE AND EXPERIENCE LA English DT Article AB The paper describes Parallel Universal Matrix Multiplication Algorithms (PUMMA) on distributed memory concurrent computers. The PUMMA package includes not only the non-transposed matrix multiplication routine C = A . B, but also transposed multiplication routines C = A(T) . B, C = A . B(T), and C = A(T) . B(T), for a block cyclic data distribution. The routines perform efficiently for a wide range of processor configurations and block sizes. The PUMMA together provide the same functionality as the Level 3 BLAS routine xGEMM. Details of the parallel implementation of the routines are given, and results are presented for runs on the Intel Touchstone Delta computer. C1 OAK RIDGE NATL LAB,MAT SCI SECT,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT COMP SCI,KNOXVILLE,TN 37996. RI Walker, David/B-7978-2010; Dongarra, Jack/E-3987-2014; OI Walker, David/0000-0002-1360-6330 NR 23 TC 35 Z9 35 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 1040-3108 J9 CONCURRENCY-PRACT EX JI Concurrency-Pract. Exp. PD OCT PY 1994 VL 6 IS 7 BP 543 EP 570 DI 10.1002/cpe.4330060702 PG 28 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA PM539 UT WOS:A1994PM53900001 ER PT J AU CHRISTENSEN, JN SELVERSTONE, J ROSENFELD, JL DEPAOLO, DJ AF CHRISTENSEN, JN SELVERSTONE, J ROSENFELD, JL DEPAOLO, DJ TI CORRELATION BY RB-SR GEOCHRONOLOGY OF GARNET GROWTH HISTORIES FROM DIFFERENT STRUCTURAL LEVELS WITHIN THE TAUERN WINDOW, EASTERN ALPS SO CONTRIBUTIONS TO MINERALOGY AND PETROLOGY LA English DT Article ID PIKWITONEI GRANULITE DOMAIN; P-T PATHS; CRYSTAL-CHEMISTRY; SILICATE GARNETS; METAMORPHISM; SCHISTS; CHRONOMETRY; MANITOBA; AUSTRIA; UPLIFT AB In order to evaluate rates of tectonometamorphic processes, growth rates of garnets from metamorphic rocks of the Tauern Window, Eastern Alps were measured using Rb-Sr isotopes. The garnet growth rates were determined from Rb-Sr isotopic zonation of single garnet crystals and the Rb-Sr isotopic compositions of their associated rock matrices. Garnets were analyzed from the Upper Schieferhulle (USH) and Lower Schieferhulle (LSH) within the Tauern Window. Two garnets from the USH grew at rates of 0.67(-0.13)+0.19 mm/million years and 0.88(-0.19)+0.34 mm/million years, respectively, indicating an average growth duration of 5.4 +/- 1.7 million years. The duration of growth coupled with the amount of rotation recorded by inclusion trails in the USH garnets yields an average shear-strain rate during garnet growth of 2.7(-0.7)+1.2 x 10(-14) s-1. Garnet growth in the sample from the USH occurred between 35.4 +/- 0.6 and 30 +/- 0.8 Ma. The garnet from the LSH grew at a rate of 0.23 +/- 0.015 mm/million years, between 62 +/- 1.5 Ma and 30.2 +/- 1.5 Ma. Contemporaneous cessation of garnet growth in both units at approximately 30 Ma is in accord with previous dating of the thermal peak of metamorphism in the Tauern Window. Correlation with previously published pressure-temperature paths for garnets from the USH and LSH yields approximate rates of burial, exhumation and heating during garnet growth. Assuming that these P - T paths are applicable to the garnets in this study, the contemporaneous exhumation rates recorded by garnet in the USH and LSH were approximately 4(-2)+3 mm/year and 2 +/- 1 mm/year, respectively. C1 UNIV CALIF LOS ANGELES, DEPT EARTH & SPACE SCI, LOS ANGELES, CA 90024 USA. LAWRENCE BERKELEY LAB, DIV EARTH SCI, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT GEOL & GEOPHYS, CTR ISOTOPE GEOCHEM, BERKELEY, CA 94720 USA. UNIV COLORADO, DEPT GEOL SCI, BOULDER, CO 80309 USA. RI Christensen, John/D-1475-2015; Selverstone, Jane/A-9809-2008 OI Selverstone, Jane/0000-0003-4234-4111 NR 33 TC 116 Z9 118 U1 0 U2 4 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0010-7999 J9 CONTRIB MINERAL PETR JI Contrib. Mineral. Petrol. PD OCT PY 1994 VL 118 IS 1 BP 1 EP 12 DI 10.1007/BF00310607 PG 12 WC Geochemistry & Geophysics; Mineralogy SC Geochemistry & Geophysics; Mineralogy GA PN756 UT WOS:A1994PN75600001 ER PT J AU LUE, JW AF LUE, JW TI REVIEW OF STABILITY EXPERIMENTS ON CABLE-IN-CONDUIT CONDUCTORS SO CRYOGENICS LA English DT Article DE CABLE-IN-CONDUIT CONDUCTORS; STABILITY; HEAT TRANSFER ID SUPERCONDUCTOR STABILITY; SUPERCRITICAL HELIUM; MARGIN; COIL AB The stability of a cable-in-conduit conductor (CICC) cooled with supercritical helium can be very high if it is operated below a certain limiting current. This limiting current can be determined by a Stekly type heat balance equation. However, an effective heat transfer coefficient that depends not only on the conductor and the coolant, but also on the heating condition, should be used in the equation. By reviewing the stability experiments performed on CICCs, it is shown that, depending on the effectiveness of the heating induced flow, the effective heat transfer coefficient can be as low as 400 W m(-2) K-1 or as high as 1400 W m(-2) K-1. Based on this review, conclusions and comments are made with regard to the permissible current density, ramp rate limitation and dual cooling channel in a CICC. RP LUE, JW (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 40 TC 25 Z9 30 U1 0 U2 6 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0011-2275 J9 CRYOGENICS JI Cryogenics PD OCT PY 1994 VL 34 IS 10 BP 779 EP 786 DI 10.1016/0011-2275(94)90062-0 PG 8 WC Thermodynamics; Physics, Applied SC Thermodynamics; Physics GA PJ841 UT WOS:A1994PJ84100001 ER PT J AU ESPOSITO, MS RAMIREZ, RM BRUSCHI, CV AF ESPOSITO, MS RAMIREZ, RM BRUSCHI, CV TI NONRANDOMLY-ASSOCIATED FORWARD MUTATION AND MITOTIC RECOMBINATION YIELD YEAST DIPLOIDS HOMOZYGOUS FOR RECESSIVE MUTATIONS SO CURRENT GENETICS LA English DT Article DE SACCHAROMYCES-CEREVISIAE; SPONTANEOUS MUTATION; MITOTIC SEGREGATION; LOSS OF HETEROZYGOSITY; RECOMBINATION ID SACCHAROMYCES-CEREVISIAE; DNA-REPAIR; GENE; GENERATIONS; MUTANTS; STAGE AB We have employed the analysis of spontaneous forward mutations that confer the ability to utilize L-alpha-amminoadipate as a nitrogen source (alpha-Aa(+)) to discern the events that contribute to mitotic segregation of spontaneous recessive mutations by diploid cells. alpha-Aa(-) diploid cells yield alpha-Aa(+) mutants at a rate of 7.8 +/- 3.6x10(-9). As in haploid strains, approximately 97% (30/31) of alpha-Aa(+) mutants are spontaneous lys2-x recessive mutations. alpha-Aa(+) mutants of diploid cells reflect mostly the fate of LYS2/lys2-x heterozygotes that arise by mutation within LYS2/LYS2 populations at a rate of 1.2 +/- 0.4x10(-6). Mitotic recombination occurs in nonrandom association with forward mutation of LYS2 at a rate of 1.3 +/- 0.6x10(-3). This mitotic recombination rate is tenfold higher than that of a control LYS2/lys2-1 diploid. Mitotic segregation within LYS2/lys2-x subpopulations yields primarily lys2-x/lys2-x diploids and a minority of lys2-x aneuploids. Fifteen percent of lys2-x/lys2-x diploids appear to have arisen by gene conversion of LYS2 to lys2-x; 85% of lys2-x/lys2-x diploids appear to have arisen by mitotic recombination in the CENII-LYS2 interval. lys2-1/lys2-1 mitotic segregants of a control LYS2/lys2-1 diploid consist similarly of 18% of lys2-1/lys2-1 diploids that appear to have arisen by gene conversion of LYS2 to lys2-1 and 82% of lys2-1/lys2-1 diploids that appear to have arisen by mitotic recombination in the CENII-LYS2 interval. The methods described can be used to simultaneously monitor the effects of yeast gene mutations and carcinogens on the principal parameters affecting the genomic stability of diploid mitotic cells: mutation, gene conversion, intergenic recombination, and chromosomal loss or rearrangement. C1 SAN FRANCISCO STATE UNIV,DEPT BIOL,SAN FRANCISCO,CA 94132. INT CTR GENET ENGN & BIOTECHNOL,UNITED NATIONS IND DEV ORG,DEPT MICROBIOL,I-34012 TRIESTE,ITALY. RP ESPOSITO, MS (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720, USA. NR 23 TC 9 Z9 9 U1 1 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0172-8083 J9 CURR GENET JI Curr. Genet. PD OCT PY 1994 VL 26 IS 4 BP 302 EP 307 DI 10.1007/BF00310493 PG 6 WC Genetics & Heredity SC Genetics & Heredity GA PJ451 UT WOS:A1994PJ45100003 PM 7882423 ER PT J AU DIXON, P AF DIXON, P TI TESTING SPATIAL SEGREGATION USING A NEAREST-NEIGHBOR CONTINGENCY TABLE SO ECOLOGY LA English DT Article DE NEAREST NEIGHBOR; PIELOU TEST; SEGREGATION; SPATIAL PATTERN ID POINT PATTERNS; INHOMOGENEOUS POPULATIONS; SEX-RATIO; TREE; SIZE AB Segregation of species occurs when a species tends to be found near conspecifics. This is frequently investigated using a contingency table, classifying each point by its species and the species of its nearest neighbor. Pielou proposed using a 1-df chi-square test of independence as a test of segregation. This test is inappropriate if all locations within a study area are mapped. For completely mapped data, I derive the expectations and variances of the cell counts in the nearest-neighbor contingency table under the null hypothesis that species labels are randomly assigned to points. The properties of the cell counts suggest a new 2-df chi-square test of spatial segregation, a pair of species-specific tests, and a pair of species-specific measures of segregation. In small samples, the proposed tests have the appropriate size, unlike the Pielou test. The new test is illustrated with three examples: Pielou's Douglas-fir/ponderosa pine data, a realization of a mother-daughter process, and the locations of male and female water tupelo trees. C1 N CAROLINA STATE UNIV,DEPT STAT,BIOMATH PROGRAM,RALEIGH,NC 27695. RP DIXON, P (reprint author), UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802, USA. NR 31 TC 63 Z9 67 U1 1 U2 11 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE, NW, STE 400, WASHINGTON, DC 20036 SN 0012-9658 J9 ECOLOGY JI Ecology PD OCT PY 1994 VL 75 IS 7 BP 1940 EP 1948 DI 10.2307/1941598 PG 9 WC Ecology SC Environmental Sciences & Ecology GA PK129 UT WOS:A1994PK12900008 ER PT J AU ENGLISH, MR SCHWEITZER, M ALTMAN, JA AF ENGLISH, MR SCHWEITZER, M ALTMAN, JA TI INTERACTIVE EFFORTS BETWEEN UTILITIES AND NONUTILITY PARTIES - CONSTRAINTS AND POSSIBILITIES SO ENERGY LA English DT Article AB During the past 5 years, a number of interactive efforts have been initiated between investor-owned utilities and non-utility parties in the U.S. Typically, these efforts focus on utility demand-side management (DSM) programs and on related regulatory policies. We examine how well these efforts are succeeding, describe conditions that promote or impede interactive efforts, and discuss what can realistically be expected from their use. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP ENGLISH, MR (reprint author), UNIV TENNESSEE,CTR ENERGY ENVIRONM & RESOURCES,327 S STADIUM HALL,KNOXVILLE,TN 37996, 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, ENGLAND OX5 1GB SN 0360-5442 J9 ENERGY JI Energy PD OCT PY 1994 VL 19 IS 10 BP 1051 EP 1060 DI 10.1016/0360-5442(94)90093-0 PG 10 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA PH326 UT WOS:A1994PH32600006 ER PT J AU HUNTINGTON, H SCHIPPER, L SANSTAD, AH AF HUNTINGTON, H SCHIPPER, L SANSTAD, AH TI MARKETS FOR ENERGY EFFICIENCY - INTRODUCTION SO ENERGY POLICY LA English DT Editorial Material C1 LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,ENERGY ANAL PROGRAM,BERKELEY,CA 94720. RP HUNTINGTON, H (reprint author), STANFORD UNIV,ENERGY MODELING FORUM,406 TERMAN CTR,STANFORD,CA 94305, USA. NR 0 TC 14 Z9 14 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA LINACRE HOUSE JORDAN HILL, OXFORD, OXON, ENGLAND OX2 8DP SN 0301-4215 J9 ENERG POLICY JI Energy Policy PD OCT PY 1994 VL 22 IS 10 BP 795 EP 797 DI 10.1016/0301-4215(94)90136-8 PG 3 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA PZ452 UT WOS:A1994PZ45200001 ER PT J AU SANSTAD, AH HOWARTH, RB AF SANSTAD, AH HOWARTH, RB TI NORMAL MARKETS, MARKET IMPERFECTIONS AND ENERGY EFFICIENCY SO ENERGY POLICY LA English DT Article DE ENERGY EFFICIENCY; ECONOMIC ANALYSIS; MARKET IMPERFECTIONS AB The conventional distinction between 'economic' and 'engineering' approaches to energy analysis obscures key methodological issues concerning the measurement of the costs and benefits of policies to promote the adoption of energy-efficient technologies. The engineering approach is in fact based upon firm economic foundations: the principle of lifecycle cost minimization that arises directly from the theory of rational investment. Thus, evidence that so-called 'market barriers' impede the adoption of cost-effective energy-efficient technologies implies the existence of market failures as defined in the context of microeconomic theory. Problems of imperfect information and bounded rationality on the part of consumers, for example, may lead real world outcomes to deviate from the dictates of efficient resource allocation. A widely held contrary view, that the engineering view lacks economic justification, is based on the fallacy that markets are 'normally' efficient. C1 UNIV CALIF SANTA CRUZ,ENVIRONM STUDIES PROGRAM,SANTA CRUZ,CA 95064. RP SANSTAD, AH (reprint author), LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,ENERGY ANAL PROGRAM,BLDG 90,ROOM 4000,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. RI Embrett, Mark/H-4466-2014; OI Embrett, Mark/0000-0002-3969-0219; Howarth, Richard/0000-0003-3182-7345 NR 40 TC 78 Z9 79 U1 0 U2 5 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA LINACRE HOUSE JORDAN HILL, OXFORD, OXON, ENGLAND OX2 8DP SN 0301-4215 J9 ENERG POLICY JI Energy Policy PD OCT PY 1994 VL 22 IS 10 BP 811 EP 818 DI 10.1016/0301-4215(94)90139-2 PG 8 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA PZ452 UT WOS:A1994PZ45200004 ER PT J AU KOOMEY, JG SANSTAD, AH AF KOOMEY, JG SANSTAD, AH TI TECHNICAL EVIDENCE FOR ASSESSING THE PERFORMANCE OF MARKETS AFFECTING ENERGY EFFICIENCY SO ENERGY POLICY LA English DT Article DE MARKET FAILURES; MARKET IMPERFECTIONS; ENERGY EFFICIENCY AB This paper focuses on the empirical basis for skepticism about the effectiveness of the market mechanism in promoting cost-effective energy-efficiency improvements. We present a framework for evaluating engineering economic evidence on the diffusion of energy-efficiency improvements, and then present a series of examples within this framework that provide evidence for the existence of market imperfections related to energy efficiency. We conclude with a challenge to economists, policy analysts, and technologists to take this empirical evidence seriously and sponsor further collaborative research in this area. RP KOOMEY, JG (reprint author), LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,ENERGY ANAL PROGRAM,BERKELEY,CA 94720, USA. NR 18 TC 26 Z9 26 U1 0 U2 2 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA LINACRE HOUSE JORDAN HILL, OXFORD, OXON, ENGLAND OX2 8DP SN 0301-4215 J9 ENERG POLICY JI Energy Policy PD OCT PY 1994 VL 22 IS 10 BP 826 EP 832 DI 10.1016/0301-4215(94)90141-4 PG 7 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA PZ452 UT WOS:A1994PZ45200006 ER PT J AU LEVINE, MD SONNENBLICK, R AF LEVINE, MD SONNENBLICK, R TI ON THE ASSESSMENT OF UTILITY DEMAND-SIDE MANAGEMENT PROGRAMS SO ENERGY POLICY LA English DT Article DE DEMAND-SIDE MANAGEMENT; UTILITIES; ENERGY-EFFICIENCY PROGRAMS AB We compare the total resource cost and willingness to pay accounting methods of calculating demand-side management benefits and costs. After a review of Massachusetts Electric Company's process evaluation data, we conclude that the total resource cost method more accurately represents actual program results. However, even the total resource cost method may be incomplete, since it fails to account for savings associated with efficient equipment purchased independent of the utility program, but as a direct result of participants' positive, educational experiences in the program. RP LEVINE, MD (reprint author), LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,ENERGY ANAL PROGRAM,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 4 TC 15 Z9 15 U1 0 U2 3 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA LINACRE HOUSE JORDAN HILL, OXFORD, OXON, ENGLAND OX2 8DP SN 0301-4215 J9 ENERG POLICY JI Energy Policy PD OCT PY 1994 VL 22 IS 10 BP 848 EP 856 DI 10.1016/0301-4215(94)90144-9 PG 9 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA PZ452 UT WOS:A1994PZ45200009 ER PT J AU HIRST, E AF HIRST, E TI STATISTICAL RECOUPLING - BREAKING THE LINK BETWEEN ELECTRIC UTILITY SALES AND REVENUES SO ENERGY SOURCES LA English DT Article AB In 1991, US electric utilities spent $1.8 billion on demand-side management (DSM) programs. However, utility DSM efforts vary enormously across the country, concentrated in only a few states. This concentration is partly a function of regulatory reforms that remove disincentives to utility shareholders for investments in DSM programs. A key component of these reforms is recovery of the net lost revenues caused by utility DSM programs. These lost revenues occur between rate cases when a utility encourages its customers to improve energy efficiency and cut demand. The reduction in sales means that the utility has less revenue to cover its fixed costs. This article describes a new method, statistical recoupling (SR), that addresses this net-lost-revenue problem. Like other decoupling approaches, SR breaks the link between revenues and sales. Unlike other approaches, SR minimizes changes from traditional regulation. In particular the revenue risks associated with year-to-year changes in weather and the economy remain with the utility under SR. Statistical recoupling uses statistical models that explain retail electricity sales as functions of the number of utility customers, winter and summer weather the condition of the local economy, electricity price, and perhaps a few other key variables. These models, along with the actual values of the explanatory variables, are used to estimate ''allowed'' electricity sales and revenues in future years. For example, a utility might use quarterly data from 1980 through 1992 to estimate the SR models. The models would then be used to determine allowed revenues for 1993, 1994, and 1995. Five utilities provided data to use in testing this new approach. The empirical results are quite promising. The annual errors are almost all less than 2%. And the 3-year averages for these utilities are less than 1.3%. The lack of patterns across these 3 years and five utilities suggests that statistical recoupling is a robust method. RP HIRST, E (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0090-8312 J9 ENERG SOURCE JI Energy Sources PD OCT-DEC PY 1994 VL 16 IS 4 BP 549 EP 569 DI 10.1080/00908319408909096 PG 21 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA PN245 UT WOS:A1994PN24500005 ER PT J AU OBERDORSTER, G FERIN, J LEHNERT, BE AF OBERDORSTER, G FERIN, J LEHNERT, BE TI CORRELATION BETWEEN PARTICLE-SIZE, IN-VIVO PARTICLE PERSISTENCE, AND LUNG INJURY SO ENVIRONMENTAL HEALTH PERSPECTIVES LA English DT Article; Proceedings Paper CT Workshop on Biopersistence of Respirable Synthetic Fibers and Minerals CY SEP 07-09, 1992 CL LYON, FRANCE SP INT AGCY RES CANC, INSERM, CNRS DE ULTRAFINE PARTICLES; DOSIMETRY; RETENTION; LUNG CLEARANCE; PARTICLE SURFACE AREA; INFLAMMATION ID ALVEOLAR MACROPHAGES; ULTRAFINE PARTICLES; DIESEL EXHAUST; PULMONARY; INTERSTITIUM; MECHANISMS; INHALATION; FIBROSIS; RATS AB Dosimetry parameters such as deposition, clearance, retention, and translocation and dissolution of inhaled particles in and to different lung compartments may be important for the persistence of particles in the lung and may correlate with adverse pulmonary effects. We investigated such correlations using a model involving TiO2 particles of two particle sizes (20 nm diameter, ultrafine; 250 nm diameter, fine) of the same crystalline structure (anatase). A 12-week inhalation experiment in rats resulted in a similar mass deposition of the two particle types in the lower respiratory tract. The ultrafine particles elicited a persistently high inflammatory reaction in the lungs of the animals compared to the larger-sized particles. In the postexposure period (up to 1 year) retention in the alveolar space per se was not different between fine and ultrafine TiO2. However, the following differences between the particle types were noted: a significantly different total pulmonary retention, both quantitatively (significantly prolonged retention of the ultrafine TiO2) and qualitatively (increased translocation to the pulmonary interstitium and persistence there of the ultrafine TiO2); greater epithelial effects (Type II cell proliferation; occlusion of pores of Kohn) and the beginning of interstitial fibrotic foci with ultrafine TiO2; significant sustained impairment of alveolar macrophage function after ultrafine TiO2 exposure as measured by the clearance of test particles. A correlation between particle surface area and effects was observed. A comparison of the adverse reactions with dosimetric parameters of TiO2 in different lung compartments in the postexposure period showed a correlation of the persistence of effects in both the alveolar and interstitial space with the persistence of particles in the respective compartment. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM. RP OBERDORSTER, G (reprint author), UNIV ROCHESTER,DEPT ENVIRONM MED,ROCHESTER,NY 14642, USA. FU NIEHS NIH HHS [ES01247, ES04872] NR 19 TC 587 Z9 638 U1 7 U2 70 PU NATL INST ENVIRON HEALTH SCI PI RES TRIANGLE PK PA PO BOX 12233, RES TRIANGLE PK, NC 27709 SN 0091-6765 J9 ENVIRON HEALTH PERSP JI Environ. Health Perspect. PD OCT PY 1994 VL 102 SU 5 BP 173 EP 179 DI 10.2307/3432080 PG 7 WC Environmental Sciences; Public, Environmental & Occupational Health; Toxicology SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Toxicology GA PT108 UT WOS:A1994PT10800032 PM 7882925 ER PT J AU FELTON, JS KNIZE, MG DOLBEARE, FA WU, R AF FELTON, JS KNIZE, MG DOLBEARE, FA WU, R TI MUTAGENIC ACTIVITY OF HETEROCYCLIC AMINES IN COOKED FOODS SO ENVIRONMENTAL HEALTH PERSPECTIVES LA English DT Article; Proceedings Paper CT 5th International Conference on Carcinogenic and Mutagenic N-Substituted Aryl Compounds CY OCT 18-21, 1992 CL WURZBURG, GERMANY SP DEUT FORSCHUNGSGEMEINSCH, GERMAN SOC PHARM & TOXICOL, NATL CTR TOXOL RES, JEFFERSON, ARKANSAS, UNIV WURZBURG DE HETEROCYCLIC AMINES; MUTAGENICITY; AMES/SALMONELLA ASSAY; CHO CELLS; METABOLISM; DNA ADDUCTS ID AMES SALMONELLA TEST; FRIED GROUND-BEEF; 2-AMINO-1-METHYL-6-PHENYLIMIDAZO<4,5-B>PYRIDINE; IDENTIFICATION; CREATINE; COOKING; PROTEIN AB Mutagenic heterocyclic amines are generated in foods when they are cooked at temperatures over 150 degrees C. These compounds are present from 0.1 to 50 ppb, depending on the food and cooking conditions. These heterocyclic amines are not only present in cooked red meat, fish, and chicken, but are also present at lower levels in baked and fried foods derived from grain. Mutagenicity of fried beef hamburgers cooked at 230 degrees C is 800 +/- 37 TA98 revertants per gram cooked weight. We measured 2-amino-3,8-dimethylimidazo[4,5-f]quinox (MeIQx), 2-amino-3,4,8-trimethylimidazo[4,5-f]quinoxaline (DiMeIQx), and 2-amino-3-methylimidazo[4,5-f]quinoline (IQ) formation at this temperature and found 3.0 +/- 2.0, 1.0 +/- 0.18, and 0.06 +/- 0.03 ng/g, respectively. 2-amino-1 -methyl-6-phenylimidazo[4,5-6] pyridine (PhIP) was found al a higher concentration of 9.6 ng/g. In our laboratory we have shown these heterocyclic amines are capable of producing both reverse and forward mutations in Salmonella bacteria and forward mutations in Chinese hamster ovary cells (CHO). We have also been able to show a statistically significant increase in mutations in the pancreas of the ''mutamouse'' following PhIP exposure. The pancreas also shows relatively high DNA binding compared to other organs in the mouse, The number and type of mutations depend on the repair capacity of the cells for both Salmonella and CHO. In Salmonella the mutations are primarily 2-base deletions when the cells lack uvrB repair, but mutations are more complex (larger deletions and insertions) but lower in frequency when repair is functional. Efforts are now under way to assess specific sequence changes in the aprt gene in mutant CHO cells. RP FELTON, JS (reprint author), LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,L-452,POB 808,LIVERMORE,CA 94551, USA. FU NCI NIH HHS [CA40811, CA55861] NR 26 TC 30 Z9 31 U1 0 U2 9 PU NATL INST ENVIRON HEALTH SCI PI RES TRIANGLE PK PA PO BOX 12233, RES TRIANGLE PK, NC 27709 SN 0091-6765 J9 ENVIRON HEALTH PERSP JI Environ. Health Perspect. PD OCT PY 1994 VL 102 SU 6 BP 201 EP 204 DI 10.2307/3432178 PG 4 WC Environmental Sciences; Public, Environmental & Occupational Health; Toxicology SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Toxicology GA PT120 UT WOS:A1994PT12000036 PM 7889848 ER PT J AU BANTLE, JA BURTON, DT DAWSON, DA DUMONT, JN FINCH, RA FORT, DJ LINDER, G RAYBURN, JR BUCHWALTER, D GAUDETHULL, AM MAURICE, MA TURLEY, SD AF BANTLE, JA BURTON, DT DAWSON, DA DUMONT, JN FINCH, RA FORT, DJ LINDER, G RAYBURN, JR BUCHWALTER, D GAUDETHULL, AM MAURICE, MA TURLEY, SD TI FETAX INTERLABORATORY VALIDATION-STUDY - PHASE-II TESTING SO ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY LA English DT Article DE FETAX; XENOPUS; TERATOGEN; INTERLABORATORY VALIDATION; DEVELOPMENTAL TOXICITY ID EFFLUENT TOXICITY TESTS AB The Frog Embryo Teratogenesis Assay-Xenopus (FETAX) is a 96-h whole embryo developmental toxicity screening assay that can be used in ecotoxicology and in detecting mammalian developmental toxicants when an in vitro metabolic activation system is employed. A standardized American Society for Testing and Materials (ASTM) guide for the conduct of FETAX has been published along with a companion atlas that helps in embryo staging and identifying malformations. As part of the ASTM process, an interlaboratory validation study was undertaken to evaluate the repeatability and reliability of FETAX. Six different laboratories participated in the study. Each laboratory utilized one technician with the exception of one laboratory, which utilized two independent technicians. In Phase I, FETAX proved to be more repeatable and reliable than many other bioassays. However, some excessive variation was observed in a few laboratories. Some of this variation may have been due to an initial lack of experience with the assay by some technicians. Phase II, which is reported here, showed far less intralaboratory and interlaboratory variability than did Phase I. Nonteratogens such as saccharin and sodium cyclamate showed the most consistent results, whereas more variability was observed for the teratogens caffeine and 5-fluorouracil. Interlaboratory coefficient of variation values for all FETAX end points ranged from 7.3 to 54.7%. The minimum concentration to inhibit growth proved to be the most variable end point for three of the four test chemicals, whereas the LC50 and EC50 (malformation) proved to be less variable. C1 WYE,CTR RES & EDUC,QUEENSTOWN,MD 21658. ASHLAND UNIV,DEPT BIOL & TOXICOL,ASHLAND,OH 44805. OAK RIDGE NATL LAB,DEPT QUAL,OAK RIDGE,TN 37830. STOVER BIOMETR LABS INC,STILLWATER,OK 74076. MANTECH ENVIRONM TECHNOL INC,ENVIRONM RES LAB,CORVALLIS,OR 97333. USA,BIOMED RES & DEV LAB,FT DETRICK,MD 21702. RP BANTLE, JA (reprint author), OKLAHOMA STATE UNIV,DEPT ZOOL,STILLWATER,OK 74078, USA. NR 14 TC 39 Z9 43 U1 1 U2 4 PU SETAC PRESS PI PENSACOLA PA 1010 NORTH 12TH AVE, PENSACOLA, FL 32501-3370 SN 0730-7268 J9 ENVIRON TOXICOL CHEM JI Environ. Toxicol. Chem. PD OCT PY 1994 VL 13 IS 10 BP 1629 EP 1637 DI 10.1897/1552-8618(1994)13[1629:FIVSPI]2.0.CO;2 PG 9 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA PH803 UT WOS:A1994PH80300012 ER PT J AU ADAMS, SM HAM, KD BEAUCHAMP, JJ AF ADAMS, SM HAM, KD BEAUCHAMP, JJ TI APPLICATION OF CANONICAL VARIATE ANALYSIS IN THE EVALUATION AND PRESENTATION OF MULTIVARIATE BIOLOGICAL RESPONSE DATA SO ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY LA English DT Article DE CANONICAL VARIATE ANALYSIS; MULTIVARIATE RESPONSES; CONTAMINANT STRESS; FISH POPULATIONS; INTEGRATED STRESS RESPONSE ID CONFIDENCE-REGIONS; STREAM; FISH AB We have applied canonical variate analysis procedures for evaluating multivariate responses of fish populations to various contaminant stressors. Using examples of fish populations experiencing high levels of PCBs in a reservoir and mixed contaminants in a stream, the significance of integrated stress responses among sample populations was compared statistically and graphically using two- and three-dimensional data presentations. For fish from both systems, the most powerful axis of discrimination among sample populations was correlated with the activity of the detoxification enzyme, EROD (7-ethoxyresorufin O-deethylase). Indicators of organ dysfunction were the variables most correlated with the second axis of discrimination among sites in the PCB-contaminated reservoir study. Indicators of lipid metabolism were the variables most correlated with the second and third axes of discrimination among stream fish. Canonical variate analysis procedures are useful for evaluating multi-variate response data because they take into account the interrelations and associations among response variables and reveal the integrated nature of organism responses to stress. Using this procedure, the significance of integrated stress responses among different sample populations can be graphically compared and evaluated using two- or three-dimensional data presentations. These types of graphical displays help provide an understanding of the relationships among sample populations that may not be evident from tabular or other types of data summaries. In addition, this approach can be useful in helping to identify factors such as toxicants or other environmental stressors which impair the health of aquatic ecosystems. C1 OAK RIDGE NATL LAB, DIV ENGN PHYS & MATH, OAK RIDGE, TN 37831 USA. UNIV TENNESSEE, GRAD PROGRAM ECOL, KNOXVILLE, TN 37996 USA. RP ADAMS, SM (reprint author), OAK RIDGE NATL LAB, DIV ENVIRONM SCI, POB 2008, OAK RIDGE, TN 37831 USA. NR 24 TC 8 Z9 8 U1 0 U2 1 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0730-7268 EI 1552-8618 J9 ENVIRON TOXICOL CHEM JI Environ. Toxicol. Chem. PD OCT PY 1994 VL 13 IS 10 BP 1673 EP 1683 DI 10.1897/1552-8618(1994)13[1673:AOCVAI]2.0.CO;2 PG 11 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA PH803 UT WOS:A1994PH80300018 ER PT J AU KNAPP, FF MIRZADEH, S AF KNAPP, FF MIRZADEH, S TI THE CONTINUING IMPORTANT ROLE OF RADIONUCLIDE GENERATOR SYSTEMS FOR NUCLEAR-MEDICINE SO EUROPEAN JOURNAL OF NUCLEAR MEDICINE LA English DT Review DE RADIONUCLIDE GENERATORS; THERAPY; SYNOVECTOMY; RADIOIMMUNOTHERAPY; POSITRON EMISSION TOMOGRAPHY ISOTOPES ID ULTRASHORT-LIVED IRIDIUM-191M; POSITRON EMISSION TOMOGRAPHY; LEFT-VENTRICULAR FUNCTION; MONOCLONAL-ANTIBODIES; MYOCARDIAL PERFUSION; EMITTING RADIONUCLIDES; CLINICAL-APPLICATIONS; PARENT COMPLEX; RADIOIMMUNOTHERAPY; TECHNETIUM AB In this review, the continuing importance and status of development of radionuclide generator systems for nuclear medicine are discussed. Radioisotope costs and availability are two important factors, and both nuclear reactors and accelerator facilities are required for production of the parent radioisotopes. Radionuclide generator research is currently focused on the development of generators which provide radioisotopes for positron emission tomography (PET) applications and daughter radioisotopes for various therapeutic applications which decay primarily by particle emission. Generator research continues to be influenced by developments and requirements of complementary technologies, such as the increasing availability of PET, In addition, the availability of a wide spectrum of tumor-specific antibodies, fragments, and peptides for radioimmunodiagnosis and radioimmunotherapy has stimulated the need for generator-derived radioisotopes. The advantages of treatment of arthritis of the synovial joints with radioactive particles (radiation synovectomy) may be expected to be of increasing importance as the elderly population increases, and many of these agents are prepared using generator-derived radioisotopes such as yttrium-90 and rhenium-188. Therapeutic use of the ''in vivo generator'' is a new approach, where the less radiotoxic parent radioisotope is used to prepare tissue-specific therapeutic agents. Following in vivo site localization, decay of the parent provides the daughter for therapy at the target site. The principal foundation of most diagnostic agents will continue to require technetium-99m from the molybdenum-99/technetium-99m (''Moly'') generator. With the limited availability of nuclear reactors and facilities necessary for production and processing of fission Tc-99m and the significant issues and problems associated with radioactive waste processing, however, the possibility of utilizing lower specific activity Mo-99 produced from neutron activation of enriched Mo-98 may become practical in the future. RP KNAPP, FF (reprint author), OAK RIDGE NATL LAB,DIV HLTH SCI RES,NUCL MED GRP,POB 2008,OAK RIDGE,TN 37831, USA. NR 123 TC 90 Z9 91 U1 2 U2 14 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 OCT PY 1994 VL 21 IS 10 BP 1151 EP 1165 PG 15 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA PJ527 UT WOS:A1994PJ52700017 PM 7828627 ER PT J AU FELTON, JS FULTZ, E DOLBEARE, FA KNIZE, MG AF FELTON, JS FULTZ, E DOLBEARE, FA KNIZE, MG TI EFFECT OF MICROWAVE PRETREATMENT ON HETEROCYCLIC AROMATIC AMINE MUTAGENS/CARCINOGENS IN FRIED BEEF PATTIES SO FOOD AND CHEMICAL TOXICOLOGY LA English DT Article ID GROUND-BEEF; MUTAGEN FORMATION; FOOD-PRODUCTS; MEAT; IDENTIFICATION; CARCINOGENS; CREATINE AB To investigate a method to reduce the amount of mutagenic/carcinogenic heterocyclic aromatic amines formed during frying of ground beef, the mutagenic activity in Salmonella strain TA98 was assessed and the amount of known heterocyclic amines was determined by solid-phase extraction and HPLC. The beef patties received microwave treatment for various times before frying. Microwave pretreatment for 0, 1, 1.5, 2 or 3 min before frying at either 200 degrees C or 250 degrees C for 6 min per side reduced heterocyclic aromatic amine precursors (creatine, creatinine, amino acids, glucose), water, and fat up to 30%, in the patties and resulted in a decrease in mutagenic activity up to 95%. The sum of the four heterocyclic aromatic amines shown to be present-2-amino-3,8-dimethylimidazo[4,5-f]-quinoxaline (MeIQx), 2-amino-3-methylimidazo[4,5-f]quinoline (IQ), 2-amino-3,4,8-trimethylimidazo[4,5-f]quinoxaline (DiMeIQx) and 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP)-decreased three- to nine-fold compared with control, non-microwaved beef patties fried under identical conditions. RP FELTON, JS (reprint author), LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,L452,POB 808,LIVERMORE,CA 94551, USA. FU NCI NIH HHS [CA55861] NR 35 TC 94 Z9 100 U1 1 U2 17 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0278-6915 J9 FOOD CHEM TOXICOL JI Food Chem. Toxicol. PD OCT PY 1994 VL 32 IS 10 BP 897 EP 903 DI 10.1016/0278-6915(94)90087-6 PG 7 WC Food Science & Technology; Toxicology SC Food Science & Technology; Toxicology GA PP631 UT WOS:A1994PP63100004 PM 7959444 ER PT J AU ROTHENBERGER, KS SPRECHER, RF RETCOFSKY, HL WANG, W CLARKSON, RB BELFORD, RL AF ROTHENBERGER, KS SPRECHER, RF RETCOFSKY, HL WANG, W CLARKSON, RB BELFORD, RL TI NATURE OF THE ELECTRON-PARAMAGNETIC-RESONANCE INTENSITY IN IODINE TREATED COALS SO FUEL LA English DT Article DE IODINE TREATMENT; COAL; ELECTRON PARAMAGNETIC RESONANCE ID SPIN-RESONANCE; LIQUEFACTION; ADSORPTION AB Three British coals and their iodine treated counterparts were examined in order to investigate the increase in electron paramagnetic resonance (e.p.r.) signal intensity that occurs upon iodine uptake. The iodine is not removed by vacuum. Scanning electron microscopy (SEM) results show that the iodine exists in a highly dispersed form. Correlation of elemental analysis and e.p.r. spin density measurements indicates two to ten new spins added per 100 added I2 molecules. A study of e.p.r. intensity as a function of temperature reveals nearly identical trends for untreated and iodine treated coals. High frequency e.p.r. resolves additional signal at lower fields in the iodine treated samples. Such observations contradict the notion of donor-acceptor complex formation between iodine and aromatic constitents of the coal. Although there is considerable evidence of iodine participation in the formation of this additional signal, it would appear to be of a non-bonding nature. C1 BURNS & ROE SERV CORP,PITTSBURGH,PA 15236. UNIV ILLINOIS,ILLINOIS EPR RES CTR,URBANA,IL 61801. RP ROTHENBERGER, KS (reprint author), US DOE,PITTSBURGH ENERGY TECHNOL CTR,POB 10940,PITTSBURGH,PA 15236, USA. NR 26 TC 3 Z9 3 U1 1 U2 1 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0016-2361 J9 FUEL JI Fuel PD OCT PY 1994 VL 73 IS 10 BP 1600 EP 1605 DI 10.1016/0016-2361(94)90138-4 PG 6 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA PF611 UT WOS:A1994PF61100007 ER PT J AU GROSS, EA MELLICK, PW KARI, FW MILLER, FJ MORGAN, KT AF GROSS, EA MELLICK, PW KARI, FW MILLER, FJ MORGAN, KT TI HISTOPATHOLOGY AND CELL REPLICATION RESPONSES IN THE RESPIRATORY-TRACT OF RATS AND MICE EXPOSED BY INHALATION TO GLUTARALDEHYDE FOR UP TO 13 WEEKS SO FUNDAMENTAL AND APPLIED TOXICOLOGY LA English DT Article ID F344 RATS; FORMALDEHYDE VAPOR; B6C3F1 MICE; VIRAL-INFECTIONS; TUMOR PREVALENCE; NASAL LESIONS; BODY-WEIGHT; PROLIFERATION; TOXICITY; CARCINOGENICITY AB In addition to being a respiratory tract irritant and cross-linking agent, glutaraldehyde has a number of properties in common with the rodent nasal carcinogen, formaldehyde. The acute and subchronic responses to glutaraldehyde in the respiratory tract of rats and mice were characterized using histopathology and epithelial cell labeling index as end points. Male and female F344 rats and B6C3F1 mice were whole-body exposed for 1 day, 4 days, 6 weeks, or 13 weeks to 0, 62.5, 125, 250, 500, or 1000 ppb glutaraldehyde using a recycling inhalation chamber. The respiratory tract, with special reference to the nose, was examined by light microscopy and histoautoradiography. Unit length labeling index (ULLI) was determined by nuclear thymidine labeling for selected sites, chosen on the basis of histopathology. A small number of animals exposed to 1000 ppb (rats and mice) or 500 ppb (mice) died before the 6-week time point; these deaths were attributed to glutaraldehyde exposure-associated occlusion of the external nares. Treatment-induced lesions, including epithelial erosions, inflammation, and squamous metaplasia, were confined to the anterior third of the nose and were present in both sexes and species. No histopathological evidence of glutaraldehyde-induced responses was observed in the trachea, central airways, or lungs, while the larynx showed minimal changes. There were clear increases in ULLI in association with acute and subacute cytotoxic responses, with similar concentration-response relationships. Neutrophilic infiltration of the squamous epithelium of the nasal vestibule, present in both rats and mice, became progressively more severe with increasing exposure time and was associated with increased ULLI. The latter responses were generally most severe at the higher glutaraldehyde exposure concentrations, while in female mice they were present at all concentrations of glutaraldehyde studied. Lesions induced by glutaraldehyde were more anterior in the nose than those reported for formaldehyde, they differed in character, and no evidence of ''pre-neoplastic'' lesions or karyomegaly, reported for formaldehyde, was observed with glutaraldehyde. (C) 1994 Society of Toxicology. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. NIEHS, NATL TOXICOL PROGRAM, CHEM PATHOL BRANCH, RES TRIANGLE PK, NC 27709 USA. RP GROSS, EA (reprint author), CHEM IND INST TOXICOL, POB 12137, RES TRIANGLE PK, NC 27709 USA. NR 47 TC 23 Z9 23 U1 0 U2 1 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0272-0590 J9 FUND APPL TOXICOL JI Fundam. Appl. Toxicol. PD OCT PY 1994 VL 23 IS 3 BP 348 EP 362 DI 10.1006/faat.1994.1115 PG 15 WC Toxicology SC Toxicology GA PL450 UT WOS:A1994PL45000004 PM 7835535 ER PT J AU BRANDRIFF, BF GORDON, LA FERTITTA, A OLSEN, AS CHRISTENSEN, M ASHWORTH, LK NELSON, DO CARRANO, AV MOHRENWEISER, HW AF BRANDRIFF, BF GORDON, LA FERTITTA, A OLSEN, AS CHRISTENSEN, M ASHWORTH, LK NELSON, DO CARRANO, AV MOHRENWEISER, HW TI HUMAN-CHROMOSOME-19P - A FLUORESCENCE IN-SITU HYBRIDIZATION MAP WITH GENOMIC DISTANCE ESTIMATES FOR 79 INTERVALS SPANNING 20-MB SO GENOMICS LA English DT Article ID HUMAN ALPHA(1,3)FUCOSYLTRANSFERASE GENE; INSITU HYBRIDIZATION; REPEAT-POLYMORPHISM; HIGH-RESOLUTION; COSMID CONTIGS; FAMILY; SEQUENCES; ONSET; ORGANIZATION; EXPRESSION AB A physical map of human chromosome 19p has been constructed by fluorescence in situ hybridization of cosmids to metaphase chromosomes and sperm pronuclear interphases. The map spans similar to 20 Mb and was generated with 141 multiple, partially overlapping estimates of genomic distances for 79 intervals separating 80 sequentially ordered cosmid reference points. The average distance separating pairs of cosmids was 250 kb, with a range from 50 to 700 kb; 75% of the intervals were estimated to be less than or equal to 300 kb and only 8 intervals were between 500 and 700 kb. Cosmids positive for 33 genes or gene families and 5 polymorphic markers were included among the mapped elements. The fluorescence in situ hybridization map will be useful for furthering the integration of the physical and genetic maps of 19p and for placing newly identified markers within a few hundred kb of their neighbors. (C) 1994 Academic Press, Inc. RP BRANDRIFF, BF (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,BIOL & BIOTECHNOL RES PROGRAM,POB 808,LIVERMORE,CA 94550, USA. NR 42 TC 54 Z9 54 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD OCT PY 1994 VL 23 IS 3 BP 582 EP & DI 10.1006/geno.1994.1546 PG 0 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA PN753 UT WOS:A1994PN75300010 PM 7851886 ER PT J AU KIRCHNER, JM SALAZAR, EP LAMERDIN, JE MONTGOMERY, MA CARRANO, AV WEBER, CA AF KIRCHNER, JM SALAZAR, EP LAMERDIN, JE MONTGOMERY, MA CARRANO, AV WEBER, CA TI CLONING AND MOLECULAR CHARACTERIZATION OF THE CHINESE-HAMSTER ERCC2 NUCLEOTIDE EXCISION-REPAIR GENE SO GENOMICS LA English DT Article ID TRANSCRIPTIONALLY ACTIVE DNA; COMPLEMENTATION GROUP-H; XERODERMA-PIGMENTOSUM; SACCHAROMYCES-CEREVISIAE; COCKAYNE-SYNDROME; RAD3 GENE; YEAST RAD3; MITOTIC RECOMBINATION; UV-SENSITIVITY; HELICASE AB The Chinese hamster ERCC2 nucleotide excision repair gene, encoding a presumed ATP-dependent DNA helicase, was cloned from the V79 cell line, and its nucleotide sequence was determined. The similar to 15-kb gene comprises 23 exons with a 2283-base open reading frame. The predicted 760-amino-acid protein is 98% identical to the human ERCC2/XPD (760 amino acids), 51% identical to the Saccharomyces cerevisiae RAD3 (778 amino acids), and 54% identical to the Schizosaccharomyces pombe rad15 (772 amino acids) proteins. The promoter region of the hamster ERCC2 gene contains a pyrimidine-rich stretch (42 nucleotides, 88% C+T) similar to sequences found in the promoter regions of two other nucleotide excision repair genes, a GC box, a putative alpha-Pal transcription factor binding site, and two CAAT boxes. There is no apparent TAATA box. No consensus polyadenylation sequence (AATAAA or its variants) was found within 663 bases 3' of the translation termination codon. (C) 1994 Academic Press, Inc. C1 LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,LIVERMORE,CA 94551. FU NCI NIH HHS [CA52679] NR 54 TC 14 Z9 15 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 OCT PY 1994 VL 23 IS 3 BP 592 EP 599 DI 10.1006/geno.1994.1547 PG 8 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA PN753 UT WOS:A1994PN75300011 PM 7851887 ER PT J AU OLSEN, A TEGLUND, S NELSON, D GORDON, L COPELAND, A GEORGESCU, A CARRANO, A HAMMARSTROM, S AF OLSEN, A TEGLUND, S NELSON, D GORDON, L COPELAND, A GEORGESCU, A CARRANO, A HAMMARSTROM, S TI GENE ORGANIZATION OF THE PREGNANCY-SPECIFIC GLYCOPROTEIN REGION ON HUMAN-CHROMOSOME-19 - ASSEMBLY AND ANALYSIS OF A 700-KB COSMID CONTIG SPANNING THE REGION SO GENOMICS LA English DT Article ID FLUORESCENCE INSITU HYBRIDIZATION; BETA-1-GLYCOPROTEIN GENES; HIGH-RESOLUTION; CDNA CLONING; FETAL LIVER; FAMILY; MEMBERS; EXPRESSION; LIBRARIES; IDENTIFICATION AB The pregnancy-specific glycoprotein (PSG) gene family consists of 11 closely related genes that form a subgroup of the carcinoembryonic antigen (CEA) gene family on 19q13.2. Using a high-resolution restriction fragment fingerprinting technique, we have assembled 256 cosmids from the PSG region into a single 700-kb contig. Fluorescence in situ hybridization to sperm pronuclei and cosmid walking experiments indicated that this PSG contig was directly telomeric of CGM8 at the telomeric end of the CEA subgroup gene cluster. Detailed restriction mapping and hybridization with gene-specific probes indicated that the order of the 11 previously identified PSG genes is cen-PSG3-PSG8-PSG12-PSQ1-PSG6-PSG7-PSG13-PSG2-PSG5- PSG4-PSG11-tel. The CEA subgroup gene CGM11 is located at the telomeric end of the PSG gene cluster. The PSG genes are all oriented in tandem with the 5'-3' direction of transcription from telomere to centromere. The detailed map also led to the identification of seven new CEA family genes in this region. One of these (CGM12), located between CGM8 and PSG3, is a member of the CEA subgroup. The remaining six (CGM13 through CGM18) are interspersed among the PSG genes and appear to form a third distinct subgroup within the CEA gene family. (C) 1994 Academic Press, Inc. C1 UMEA UNIV,DEPT IMMUNOL,S-90185 UMEA,SWEDEN. RP OLSEN, A (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,BIOL & BIOTECHNOL RES PROGRAM,POB 808,LIVERMORE,CA 94550, USA. NR 34 TC 61 Z9 61 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD OCT PY 1994 VL 23 IS 3 BP 659 EP 668 DI 10.1006/geno.1994.1555 PG 10 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA PN753 UT WOS:A1994PN75300019 PM 7851895 ER PT J AU TEGLUND, S OLSEN, A KHAN, WN FRANGSMYR, L HAMMARSTROM, S AF TEGLUND, S OLSEN, A KHAN, WN FRANGSMYR, L HAMMARSTROM, S TI THE PREGNANCY-SPECIFIC GLYCOPROTEIN (PSC) GENE-CLUSTER ON HUMAN-CHROMOSOME-19 - FINE-STRUCTURE OF THE 11 PSG GENES AND IDENTIFICATION OF 6 NEW GENES FORMING A 3RD SUBGROUP WITHIN THE CARCINOEMBRYONIC ANTIGEN (CEA) FAMILY SO GENOMICS LA English DT Article ID CELL-ADHESION; FETAL LIVER; BETA-1-GLYCOPROTEIN GENES; MOLECULAR-CLONING; SEQUENCE-ANALYSIS; CDNA CLONING; EXPRESSION; MEMBERS; IMMUNOGLOBULIN; PROTEINS AB The human pregnancy-specific glycoprotein (PSG) genes belong to the carcinoembryonic antigen (CEA) family, which in turn is a member of the immunoglobulin superfamily. We have analyzed a 700-kb cosmid contig spanning the PSG region on chromosome 19q13.2. The region contains 11 closely related PSG genes organized in tandem with a highly conserved structure and organization. Seven novel genes (CGM12 to CGM18) were found in the PSG region. CGM12 belongs to the CEA subgroup and appears to be a pseudogene. CGM13 to CGM18 forms a third new subgroup within the CEA gene family. The members of this new subgroup show 94-99% identity to each other but only 70-80% to other members of either the CEA or the PSG subgroups. They are composed of exons encoding two IgC-like domains and short hydrophilic carboxyl terminals similar to those of the PSGs. Unlike any of the known CEA family genes, however, they seem to lack the exon for an IgV-Iike N-terminal domain. (C) 1994 Academic Press, Inc. C1 UMEA UNIV,DEPT IMMUNOL,S-90185 UMEA,SWEDEN. LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,BIOL & BIOTECHNOL RES PROGRAM,LIVERMORE,CA 94550. NR 54 TC 55 Z9 55 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 OCT PY 1994 VL 23 IS 3 BP 669 EP 684 DI 10.1006/geno.1994.1556 PG 16 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA PN753 UT WOS:A1994PN75300020 PM 7851896 ER PT J AU BELL, JLS PALMER, DA BARNES, HL DRUMMOND, SE AF BELL, JLS PALMER, DA BARNES, HL DRUMMOND, SE TI THERMAL-DECOMPOSITION OF ACETATE .3. CATALYSIS BY MINERAL SURFACES SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Review ID ALIPHATIC ACID ANIONS; ENTHALPY-ENTROPY RELATIONSHIP; ACETIC-ACID; CARBOXYLIC-ACIDS; AQUEOUS-SOLUTIONS; ORGANIC-ACIDS; NATURAL-GAS; HYDROTHERMAL SYSTEMS; SEDIMENTARY BASINS; CORROSION BEHAVIOR AB The kinetics of thermal decarboxylation of aqueous solutions of acetic acid and sodium acetate were evaluated at 335 and 355 degrees C in contact with various surfaces as potential catalysts. Quartz, fused quartz, calcite, natural pyrite, titanium oxide, and Au apparently do not catalyze aqueous decarboxylation reactions, in contrast to Pyrex, Ca-montmorillonite, Fe-bearing montmorillonite, hematite, synthetic pyrite, and magnetite. The dependence of the rate of acetic acid decarboxylation on the surface area of pyrite per unit solution volume was also studied. The results show that the decarboxylation of acetic acid and acetate is catalyzed heterogeneously, with the cleavage of the C-C bond occurring while the acetate molecule is adsorbed onto a surface. Entropies and enthalpies of activation obtained from these experiments are compatible with the isokinetic relationship established previously for acetic acid and acetate under similar experimental conditions, indicating the existence of a common rate-determining step. Experimental evidence indicates that oxidation of acetic acid can occur with hematite and defected magnetite. These oxidative decomposition reactions differ from the decarboxylation reaction in that CO2 and polycondensates are produced instead of CO2 and CH4. C1 PENN STATE UNIV,DEPT GEOSCI,ORE DEPOSITS RES SECT,UNIVERSITY PK,PA 16802. RP BELL, JLS (reprint author), OAK RIDGE NATL LAB,DIV CHEM,BLDG 4500S,OAK RIDGE,TN 37831, USA. NR 141 TC 56 Z9 57 U1 1 U2 24 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD OCT PY 1994 VL 58 IS 19 BP 4155 EP 4177 DI 10.1016/0016-7037(94)90271-2 PG 23 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA PK700 UT WOS:A1994PK70000012 ER PT J AU REAGAN, MK MORRIS, JD HERRSTROM, EA MURRELL, MT AF REAGAN, MK MORRIS, JD HERRSTROM, EA MURRELL, MT TI URANIUM SERIES AND BERYLLIUM ISOTOPE EVIDENCE FOR AN EXTENDED HISTORY OF SUBDUCTION MODIFICATION OF THE MANTLE BELOW NICARAGUA SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID AMERICAN VOLCANIC FRONT; MID-ATLANTIC RIDGE; JUAN-DE-FUCA; ARC MAGMAS; GORDA RIDGES; COSTA-RICA; SYSTEMATICS; BASALTS; GEOCHEMISTRY; ISLAND AB U-series nuclides, beryllium, and lead isotopes have been measured on historic lavas from eight volcanoes in Nicaragua. Low-Ti samples from northern Nicaragua have (Th-230)/(Th-232) ratios from 2.23 to 2.56 and are enriched in U-238 and U-234 over Th-230 by 1-16%. Those from southern Nicaragua have (Th-230)/(Th-232) approximate to 2.1 and have (U-238)/(Th-230) = 1.0-0.9. High-Ti samples have intermediate (Th-230)/(Th-232) ratios and are strongly enriched in Th-230. Lead isotopic data for all samples plot in the mantle array with Pb-206/(204)pb = 18.50-18.63. Th isotopic ratios for all samples imply source U/Th ratios that are significantly higher than those implied by lead isotopic ratios. All historic samples have (Po-210)/(Th-230) and thus (Ra-226)/(Th-230) > 1, suggesting that lavas erupt less than 8,000 y after generation. Thorium isotopic ratios for all volcanic samples correlate well with Be-10/Be-9 and B/Be as well as with Sr-87/Sr-86 and Ba/La ratios from the literature. (U-238)/(Th-230) ratios do not correlate well with any of these ratios but rather anti-correlate with Th concentrations and published La/Yb ratios. These observations, and inferences therefrom, lead to the following preferred, although not completely unique, interpretations. Comparison of thorium, beryllium, and strontium isotopic ratios of the Cocos plate sediments at DSDP 495 with the low-Ti volcanic regression trends shows that the subducted component transferred to the mantle has isotopic compositions similar to the bulk sediments. B/Be and Ba/La ratios of the volcanic samples are well correlated with the isotopes, but the inferred ratios in the subduction component are at least 10 and 5 times higher, respectively, than values in the bulk sediment. These relationships suggest that the subduction component combines the element-transport properties of both a melt and a hydrous fluid. The (Th-230)/(Th-232) and Sr-87/Sr-86 ratios corresponding to a Be-10/Be-9 ratio of zero are about 2.0 and 0.704, significantly higher than expected in the postulated MORB source for the lavas. We attribute these characteristics to subduction related addition of strontium, uranium, plus or minus thorium, and related tracers to the mantle prior to about 4.5 Ma, such that the Be-10 signal of this event has decayed away. The observed good correlations are generated primarily by addition of Be-10, U > Th, B and Ba between 4.5 Ma. and ca. 200-300 ka. The most recent event occurred since 200-300 ka and perhaps more recently than 8 ka. It transported only a fraction of the total slab-derived flux of Be-10, B, Ba, and probably thorium stored within the mantle, but added U > Th and may have raised the partition coefficient of uranium over thorium. The magnitude of the uranium excess thus relates to the extent of partial melting of the mantle source during this event. The U-series and beryllium isotope systematics of the high-Ti lavas are consistent with their derivation from the mantle residue after extraction of low-Ti melts. C1 CARNEGIE INST WASHINGTON,DEPT TERR MAGNETISM,WASHINGTON,DC 20015. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP REAGAN, MK (reprint author), UNIV IOWA,DEPT GEOL,IOWA CITY,IA 52242, USA. NR 73 TC 89 Z9 90 U1 0 U2 10 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD OCT PY 1994 VL 58 IS 19 BP 4199 EP 4212 DI 10.1016/0016-7037(94)90273-9 PG 14 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA PK700 UT WOS:A1994PK70000014 ER PT J AU RAO, MN GARRISON, DH BOGARD, DD REEDY, RC AF RAO, MN GARRISON, DH BOGARD, DD REEDY, RC TI DETERMINATION OF THE FLUX-DISTRIBUTION AND ENERGY-DISTRIBUTION OF ENERGETIC SOLAR PROTONS IN THE PAST 2-MYR USING LUNAR ROCK-68815 SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID PARTICLES AB Cosmogenic Ne-21, Ne-22, Ar-38, and He-3 produced by nuclear interactions of energetic (>10 MeV) solar protons were determined in 11 depth samples of lunar rock 68815. Concentrations of these proton-produced, SCR nuclides smoothly decrease from the rock surface down to 4.3 cm, where a galactic cosmic ray (GCR) component dominates. The cosmogenic Ne-21/Ne-22 isotopic ratio shows a systematic change with depth, from the characteristic GCR value of 0.79 at 4.9 cm to a mixed SCR + GCR ratio of 0.66 near the surface. The surface exposure age for 68815 calculated from both SCR and GCR components for Ne-21, Ne-22, and Ar-38 agrees with the reported Kr-81-Kr exposure age of 2.04 Myr. Theoretical SCR + GCR depth profiles were calculated from cross-section data for different assumed spectra of energetic solar protons (R(0), or rigidity, values of 50-125 MV) and for different rock surface erosion rates (0-3 mm/Myr). These theoretical SCR profiles were added to GCR profiles and statistically compared with measured data by minimizing the standard deviation of the least squares statistical fit and by requiring the GCR component in the 4.3 cm sample to be >90% of the measured concentration. SCR Ne-21, Ne-22, and Ar-38 give the following results for energetic solar protons over the last 2 Myr. For a preferred erosion rate of 1 mm/Myr and R(0) of 80-90 MV, J(4 pi, E > 10 MeV) similar or equal to 58-73 p/cm(2)/s; for the broader possible range of R(0) values of 70-100 MV, J(4 pi, E, 10 MeV) similar or equal to 49-92 p/cm(2)/s. These proton fluxes increase by similar to 12 and similar to 24% for erosion rates of 2 mm/Myr and 3 mm/Myr, respectively. These same data analysis techniques were also applied to literature depth profiles for SCR radionuclides in rock 68815. Al-26 and Mn-53 give proton fluxes comparable to those obtained from neon and argon at R(0) values of 70-85 MV, but give somewhat higher J values at larger values of R(0). Proton fluxes characterized by Kr-81 and C-14 tend to be higher compared to the other nuclides. The most likely reason for different J values determined from different SCR nuclides is errors in cross section data, although measurement errors and temporal variations in J cannot be excluded. C1 LOCKHEED ENGN & SCI CO,HOUSTON,TX 77058. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP RAO, MN (reprint author), NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058, USA. NR 35 TC 31 Z9 31 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD OCT PY 1994 VL 58 IS 19 BP 4231 EP 4245 DI 10.1016/0016-7037(94)90275-5 PG 15 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA PK700 UT WOS:A1994PK70000016 ER PT J AU SAWYER, DA FLECK, RJ LANPHERE, MA WARREN, RG BROXTON, DE HUDSON, MR AF SAWYER, DA FLECK, RJ LANPHERE, MA WARREN, RG BROXTON, DE HUDSON, MR TI EPISODIC CALDERA VOLCANISM IN THE MIOCENE SOUTHWESTERN NEVADA VOLCANIC FIELD - REVISED STRATIGRAPHIC FRAMEWORK, AR-40 AR-39 GEOCHRONOLOGY, AND IMPLICATIONS FOR MAGMATISM AND EXTENSION SO GEOLOGICAL SOCIETY OF AMERICA BULLETIN LA English DT Article ID OASIS-VALLEY CALDERA; DETACHMENT FAULT SYSTEM; WESTERN UNITED-STATES; ASH-FLOW SHEETS; TIMBER MOUNTAIN; TERTIARY EXTENSION; SOUTHERN NEVADA; BLACK MOUNTAIN; GREAT-BASIN; EVOLUTION AB The middle Miocene southwestern Nevada volcanic field (SWNVF) is a classic example of a silicic multicaldera volcanic field in the Great Basin. More than six major calderas formed between >15 and 7.5 Ma. The central SWNVF caldera cluster consists of the overlapping Silent Canyon caldera complex, the Claim Canyon caldera, and the Timber Mountain caldera complex, active from 14 to 11.5 Ma and centered on topographic Timber Mountain. Locations of calderas older than the Claim Canyon caldera source of the Tiva Canyon Tuff are uncertain except where verified by drilling. Younger peralkaline calderas (Black Mountain and Stonewall Mountain) formed northwest of the central SWNVF caldera cluster. We summarize major revisions of the SWNVF stratigraphy that provide for correlation of lava flows and small-volume tuffs with the widespread outflow sheets of the SWNVF. New laser fusion Ar-40/Ar-39 isotopic ages are used to refine and revise the timing of eruptive activity in the SWNVF. The use of high-sensitivity mass spectrometry allowed analysis of submilligram-sized samples with analytical uncertainties of approximately 0.3% (1 sigma), permitting resolution of age differences as small as 0.07 Ma. These results confirm the revised stratigraphic succession and document a pattern of episodic volcanism in the SWNVF. Major caldera episodes (Belted Range, Crater Flat, Paintbrush, Timber Mountain, and Thirsty Canyon Groups) erupted widespread ash-flow sheets within 100-300 k.y. time spans, and pre- and post-caldera lavas erupted within 100-300 k.y. of the associated ash flows. Peak volcanism in the SWNVF occurred during eruption of the Paintbrush and Timber Mountain Groups, when over 4500 km3 of metaluminous magma was erupted in two episodes within 1.35 m.y., separated by a 750 k.y. magmatic gap. Peralkaline and metaluminous magmatism in the SWNVF overlapped in time and space. The peralkaline Tub Spring and Grouse Canyon Tuffs erupted early, and the peralkaline Thirsty Canyon Group tuffs and Stonewall Flat Tuff erupted late in the history of the SWNVF, flanking the central, volumetrically dominant peak of metaluminous volcanism. Magma chemistry transitional between peralkaline and metaluminous magmas is indicated by petrographic and chemical data, particularly in the overlapping Grouse Canyon and Area 20 calderas of the Silent Canyon caldera complex. Volcanism in the SWNVF coincided with the Miocene peak of extensional deformation in adjoining parts of the Great Basin. Although regional extension was concurrent with volcanism, it was at a minimum in the central area of the SWNVF, where synvolcanic faulting was dominated by intracaldera deformation. Significant stratal tilting and paleomagnetically determined dextral shear affected the southwestern margin of the SWNVF between the Paintbrush and Timber Mountain caldera episodes. Larger magnitude detachment faulting in the Bullfrog Hills, southwest of the central SWNVF caldera cluster, followed the climatic Timber Mountain caldera episode. Postvolcanic normal faulting was substantial to the north, east, and south of the central SWNVF caldera cluster, but the central area of peak volcanic activity remained relatively unextended in postvolcanic time. Volcanism and extension in the SWNVF area were broadly concurrent, but in detail they were episodic in time and not coincident in space. C1 US GEOL SURVEY,MENLO PK,CA 94025. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SAWYER, DA (reprint author), US GEOL SURVEY,MS 913,DENVER,CO 80225, USA. NR 81 TC 118 Z9 119 U1 1 U2 8 PU GEOLOGICAL SOC AMERICA PI BOULDER PA PO BOX 9140 3300 PENROSE PLACE, BOULDER, CO 80301 SN 0016-7606 J9 GEOL SOC AM BULL JI Geol. Soc. Am. Bull. PD OCT PY 1994 VL 106 IS 10 BP 1304 EP 1318 DI 10.1130/0016-7606(1994)106<1304:ECVITM>2.3.CO;2 PG 15 WC Geosciences, Multidisciplinary SC Geology GA PJ579 UT WOS:A1994PJ57900007 ER PT J AU BRECKENRIDGE, CR POLMAN, JK AF BRECKENRIDGE, CR POLMAN, JK TI SOLUBILIZATION OF COAL BY BIOSURFACTANT DERIVED FROM CANDIDA-BOMBICOLA SO GEOMICROBIOLOGY JOURNAL LA English DT Article DE CANDIDA BOMBICOLA; COAL; LIGNITE; SURFACTANT AB Partial solubilization of North Dakota Beulah Zap lignite coal was demonstrated using crude biosurfactant preparations from glucose-based stationary-phase cultures of Candida bombicola. Results suggest that biosurfactant activity by this organism is a minor mechanism by which portions of coal can be biologically solubilized. C1 LOCKHEED IDAHO TECHNOL CO,IDAHO NATL ENGN LAB,DEPT BIOTECHNOL,IDAHO FALLS,ID 83415. NR 22 TC 6 Z9 6 U1 2 U2 2 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0149-0451 J9 GEOMICROBIOL J JI Geomicrobiol. J. PD OCT-DEC PY 1994 VL 12 IS 4 BP 285 EP 288 PG 4 WC Environmental Sciences; Geosciences, Multidisciplinary SC Environmental Sciences & Ecology; Geology GA RF568 UT WOS:A1994RF56800006 ER PT J AU HEARN, TM ROSCA, AC FEHLER, MC AF HEARN, TM ROSCA, AC FEHLER, MC TI PN TOMOGRAPHY BENEATH THE SOUTHERN GREAT-BASIN SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID WESTERN UNITED-STATES; VELOCITY STRUCTURE; MANTLE; ORIGIN; TIMES; ZONE AB P-wave first arrival times recorded on the Southern Great Basin Seismic Network were used to tomographically image lateral variations in both crustal thickness and Pn velocity beneath the southern Great Basin. The tomographic image indicates that the southern Great Basin has a flat Moho at about 30 km depth. We attribute the flat Moho to both underplating by partial melt from the uppermost mantle and to ductile flow in the crust. Magmatic underplating probably dominates where Pn velocities are low (<7.8 km/s) and ductile flow should dominate where Pn velocities are high (>7.9 km/s). Low velocity regions occur predominantly beneath the east margin of the Walker Lane Belt and the Las Vegas Shear Zone suggesting that these shear zones overlie a zone of relatively weak mantle. A region of high Pn velocity northeast of Nevada Test Site (NTS) may correspond to old lithosphere or to a region that has experienced extensive basalt extraction. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP HEARN, TM (reprint author), NEW MEXICO STATE UNIV,DEPT PHYS,LAS CRUCES,NM 88003, USA. NR 25 TC 9 Z9 9 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD OCT 1 PY 1994 VL 21 IS 20 BP 2187 EP 2190 DI 10.1029/94GL02054 PG 4 WC Geosciences, Multidisciplinary SC Geology GA PK063 UT WOS:A1994PK06300002 ER PT J AU ECKERMAN, KF WESTFALL, RJ RYMAN, JC CRISTY, M AF ECKERMAN, KF WESTFALL, RJ RYMAN, JC CRISTY, M TI AVAILABILITY OF NUCLEAR DECAY DATA IN ELECTRONIC FORM, INCLUDING BETA-SPECTRA NOT PREVIOUSLY PUBLISHED SO HEALTH PHYSICS LA English DT Article DE BETA PARTICLES; DECAY PRODUCTS; INTERNATIONAL COMMISSION ON RADIOLOGICAL PROTECTION; COMPUTERS AB The unabridged data used in preparing ICRP Publication 38 (1983) and a monograph of the Medical Internal Radiation Dose (MIRD) Committee (Weber et al. 1989) are now available in electronic form. The ''ICRP38 collection'' contains data on the energies and intensities of radiations emitted by 825 radionuclides (those in ICRP Publication 38 plus 13 from the MIRD monograph), and the ''MIRD collection'' contains data on 242 radionuclides. Each collection consists of a radiations data file and a beta spectra data file. The radiations data file contains the complete listing of the emitted radiations, their types, mean or unique energies, and absolute intensities for each radionuclide. The beta spectra file contains, for each beta-emitting radionuclide, the probability that a beta particle will be emitted with kinetic energies defined by a standard energy grid. Although summary information from the radiations data files has been published, neither the unabridged data nor the beta spectra have been published. These data files and a data extraction utility, which runs on a personal computer, are available from the Radiation Shielding Information Center at Oak Ridge National Laboratory. RP ECKERMAN, KF (reprint author), OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. NR 13 TC 65 Z9 69 U1 0 U2 1 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD OCT PY 1994 VL 67 IS 4 BP 338 EP 345 PG 8 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 PG346 UT WOS:A1994PG34600005 PM 8083046 ER PT J AU WATSON, JE WOOD, JL TANKERSLEY, WG WEST, CM AF WATSON, JE WOOD, JL TANKERSLEY, WG WEST, CM TI ESTIMATION OF RADIATION-DOSES FOR WORKERS WITHOUT MONITORING DATA FOR RETROSPECTIVE EPIDEMIOLOGIC STUDIES SO HEALTH PHYSICS LA English DT Note DE DOSE EQUIVALENT; DOSIMETRY; EPIDEMIOLOGY; RADIATION DOSE AB Dosimetry data are required for many epidemiologic studies of radiation workers. For several reasons, these data may not be available for some workers for some periods of time. An estimate of a worker's dose for such a time period can be made using data from nearby time periods for the worker or using data obtained for other workers during the same time period. This paper reports the results of an evaluation of a procedure for estimating external doses for workers included in retrospective epidemiologic studies. This evaluation was conducted using data for workers who had recorded doses for each year in a 5-y period. The dose for the middle year of the 5-y period was treated as unavailable and the dose was estimated several ways. These estimates were compared with the recorded dose. It was observed that averaging a worker's dose data for the years preceding and following a year for which data hypothetically were not available most often yielded the best estimate of the dose. At one facility studied, the use of nearby data for the same worker was a more reliable estimate for a dose than was the department or facility median or mean dose. However, at another facility, use of the department median or mean dose produced a more accurate estimate than did nearby data for the worker. These results indicate that a single procedure for estimating doses is not best for all facilities, and it is recommended that a test of the type reported in this paper be performed before a decision is made on how to estimate doses. The use of department medians or means to estimate doses consistently produced better estimates than were obtained using facility medians or means. C1 OAK RIDGE INST SCI & EDUC, DIV MED SCI, OAK RIDGE, TN 37831 USA. RP WATSON, JE (reprint author), UNIV N CAROLINA, SCH PUBL HLTH, CHAPEL HILL, NC 27599 USA. NR 1 TC 10 Z9 10 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 OCT PY 1994 VL 67 IS 4 BP 402 EP 405 DI 10.1097/00004032-199410000-00012 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 PG346 UT WOS:A1994PG34600013 PM 8083054 ER PT J AU LABONE, TR AF LABONE, TR TI MATHEMATICA, ENHANCED VERSION-2.2 FOR WINDOWS SO HEALTH PHYSICS LA English DT Software Review RP LABONE, TR (reprint author), WESTINGHOUSE SAVANNAH RIVER CO, SAVANNAH RIVER SITE, BLDG 735A, AIKEN, SC 29808 USA. NR 1 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 OCT PY 1994 VL 67 IS 4 BP 419 EP 420 PG 2 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA PG346 UT WOS:A1994PG34600016 ER PT J AU PANCHAL, CB AF PANCHAL, CB TI GENERALIZED CORRELATION FOR CONDENSATION ON VERTICAL FLUTED SURFACES SO HEAT TRANSFER ENGINEERING LA English DT Article AB A correlation was developed for laminar film condensation on vertical fluted surfaces. The theoretical analysis of Panchal and Bell was used for defining important physical property groups. The experimental data of Combs et al. were used to validate the proposed correlation. The experimental database used in the present study included four flute geometries that could be approximated to cosine-type flutes and seven fluids. The resulting correlation can predict the average condensate heat transfer coefficient within +/- 20%. RP PANCHAL, CB (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 10 TC 2 Z9 2 U1 0 U2 2 PU HEMISPHERE PUBL CORP PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0145-7632 J9 HEAT TRANSFER ENG JI Heat Transf. Eng. PD OCT-DEC PY 1994 VL 15 IS 4 BP 19 EP 23 DI 10.1080/01457639408939833 PG 5 WC Thermodynamics; Engineering, Mechanical; Mechanics SC Thermodynamics; Engineering; Mechanics GA QU912 UT WOS:A1994QU91200002 ER PT J AU MCCREERY, GE AF MCCREERY, GE TI LIQUID FLOW AND VAPOR FORMATION PHENOMENA IN A FLAT HEAT-PIPE SO HEAT TRANSFER ENGINEERING LA English DT Article ID POROUS-MEDIA; PERCOLATION AB The design and construction of a novel heat pipe apparatus is described and results from experiments that employed the apparatus are presented The apparatus is designed to permit visual and photographic study of liquid flow and vapor formation within the heat pipe wick structure, artery, and vapor flow channel. The vapor temperature field in the vapor flow channel is displayed by use of thermochromic liquid crystal material. Liquid and vapor flow phenomena observed during normal and the approach to boiling-limited heat pipe operation are described. RP MCCREERY, GE (reprint author), LOCKHEED IDAHO TECHNOL,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83402, USA. NR 11 TC 9 Z9 9 U1 1 U2 1 PU HEMISPHERE PUBL CORP PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0145-7632 J9 HEAT TRANSFER ENG JI Heat Transf. Eng. PD OCT-DEC PY 1994 VL 15 IS 4 BP 33 EP 41 DI 10.1080/01457639408939835 PG 9 WC Thermodynamics; Engineering, Mechanical; Mechanics SC Thermodynamics; Engineering; Mechanics GA QU912 UT WOS:A1994QU91200004 ER PT J AU SHI, YC FRITZ, JS AF SHI, YC FRITZ, JS TI CAPILLARY ZONE ELECTROPHORESIS OF NEUTRAL ORGANIC-MOLECULES IN ORGANIC - AQUEOUS-SOLUTION SO HRC-JOURNAL OF HIGH RESOLUTION CHROMATOGRAPHY LA English DT Article DE ELECTROPHORETIC CAPILLARY CHROMATOGRAPHY; ORGANIC MODIFIERS; HYDROPHOBIC ASSOCIATION; CAPACITY FACTORS ID ELECTROKINETIC CHROMATOGRAPHY; RESOLUTION; PHASE AB Very good separations of non-ionic organic compounds have been achieved by capillary zone electrophoresis (CZE) using a tetraheptylammonium salt as an additive in aqueous acetonitrile as solvent. A systematic study was undertaken to determine the effect of experimental parameters on electroosmotic mobility and electrophoretic mobility. It was found that pH, acetonitrile concentration, and the type and concentration of quaternary ammonium salt are important experimental variables. Under appropriate conditions, the separation window was enlarged and a broad range of electrically neutral organics, including very hydrophobic compounds (e.g. polycyclic aromatic hydrocarbons) and fairly hydrophilic compounds were separated in a relatively short time. By adjusting the separation conditions, high resolution CZE of a specific group of neutral organic compounds could be achieved. A method for calculation of capacity factor was proposed and capacity factors for a variety of non-ionic organic compounds were calculated. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. RP SHI, YC (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,DEPT CHEM,AMES,IA 50011, USA. NR 15 TC 33 Z9 33 U1 0 U2 4 PU DR ALFRED HUTHIG VERLAG GMBH PI HEIDELBERG 1 PA POSTFACH 102869, W-69018 HEIDELBERG 1, GERMANY SN 0935-6304 J9 HRC-J HIGH RES CHROM JI HRC-J. High Resolut. Chromatogr. PD OCT PY 1994 VL 17 IS 10 BP 713 EP 718 PG 6 WC Chemistry, Analytical SC Chemistry GA PT479 UT WOS:A1994PT47900005 ER PT J AU LORENZ, JG SMITH, DG AF LORENZ, JG SMITH, DG TI DISTRIBUTION OF THE 9-BP MITOCHONDRIAL-DNA REGION-V DELETION AMONG NORTH-AMERICAN INDIANS SO HUMAN BIOLOGY LA English DT Article DE MITOCHONDRIAL DNA; DELETION; NORTH AMERICAN INDIAN ID LENGTH MUTATIONS; NATIVE-AMERICANS; POPULATIONS; MIGRATIONS; AFFINITIES; LINEAGES AB The deletion of a 9-bp segment from the intergenic region between the mtDNA cytochrome oxidase II gene and the lysine tRNA gene has been documented mainly in individuals of East Asian ancestry and in individuals from East Asian-derived populations (e.g., Polynesia). Among Native Americans the deletion is absent among Eskimos and northern Na-Dene populations and present among most Amerind populations [sensu Greenberg (1987); i.e., all Native Americans except Eskimo-Aleut and Na-Dene] that have been studied. To better characterize the frequency and distribution of the 9-bp deletion in North America, we surveyed more than 400 individuals from 59 tribes representing a variety of linguistic groups. The absence of the deletion among Eskimo and northern Na-Dene populations is confirmed. Among Amerind groups the deletion is present in all groups represented by more than six individuals. The geographic distribution of the frequencies of the deletion appears to be clinal in North America. The deletion is absent in the Arctic and Subarctic and reaches its highest frequency in the Southwest. This distribution is consistent with the hypothesis that the ancestors of the Amerinds and Na-Dene arrived in the New World by means of separate migrations. The presence of the 9-bp deletion in high frequencies in all the major linguistic groups in the Southwest suggests that migration among tribes was common. RP LORENZ, JG (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT ANTHROPOL,DAVIS,CA 95616, USA. NR 18 TC 31 Z9 31 U1 0 U2 2 PU WAYNE STATE UNIV PRESS PI DETROIT PA 4809 WOODWARD AVE, DETROIT, MI 48201-1309 SN 0018-7143 J9 HUM BIOL JI Hum. Biol. PD OCT PY 1994 VL 66 IS 5 BP 777 EP 788 PG 12 WC Biology; Genetics & Heredity SC Life Sciences & Biomedicine - Other Topics; Genetics & Heredity GA PK722 UT WOS:A1994PK72200003 PM 8001909 ER PT J AU BENGTSSON, U ALTHERR, MR WASMUTH, JJ WINOKUR, ST AF BENGTSSON, U ALTHERR, MR WASMUTH, JJ WINOKUR, ST TI HIGH-RESOLUTION FLUORESCENCE IN-SITU HYBRIDIZATION TO LINEARLY EXTENDED DNA VISUALLY MAPS A TANDEM REPEAT ASSOCIATED WITH FACIOSCAPULOHUMERAL MUSCULAR-DYSTROPHY IMMEDIATELY ADJACENT TO THE TELOMERE OF 4Q SO HUMAN MOLECULAR GENETICS LA English DT Article ID POSITION-EFFECT VARIEGATION; SACCHAROMYCES-CEREVISIAE; GENE; CHROMOSOME; REGION; DROSOPHILA; CHROMATIN; FSHD; ARM AB Facioscapulohumeral muscular dystrophy (FSHD) is an autosomal dominant neuromuscular disorder. The FSHD locus has been linked to the most distal genetic markers on the long arm of chromosome 4. An EcoRI fragment length polymorphism segregates with the disease in most FSHD families. Within the EcoRI fragment lies a tandem array of 3.2 kb repeats. Deletions of integral copies of this repeat have been associated with the disease. The 3.2 kbp repeat has recently been shown to cross-hybridize to several regions of heterochromatin in the human genome and DNA sequence analysis reveals strong homology to a class of heterochromatin repeats, LSau. In this report, we demonstrate that the 3.2 kbp tandem repeat lies adjacent to a subtelomeric sequence, which is within 5-14 kb of the telomeric repeat (TTAGGG)(n). Direct visual fluorescence hybridization to linearly extended strands of DNA enabled the visualization of this subtelomeric sequence as a short string of signals at the end of a longer string of signals from the differentially labeled 3.2 kbp tandem repeat. Furthermore, in support of our data showing that the 3.2 kbp repeat lies in close proximity to the telomere of 4q, we demonstrated the lack of hybridization of total human DNA to this same region. Our results indicate that the tandem array of 3.2 kbp repeats, disrupted in FSHD, lies immediately adjacent to the telomere of 4q and that the gene responsible for FSHD is likely located proximal to the tandem repeat. C1 LOS ALAMOS NATL LAB,GENOM & STRUCT BIOL GRP,LOS ALAMOS,NM 87545. UNIV CALIF IRVINE,DEPT BIOL CHEM,IRVINE,CA 92717. FU NIGMS NIH HHS [GM07311-18] NR 25 TC 27 Z9 27 U1 0 U2 1 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0964-6906 J9 HUM MOL GENET JI Hum. Mol. Genet. PD OCT PY 1994 VL 3 IS 10 BP 1801 EP 1805 DI 10.1093/hmg/3.10.1801 PG 5 WC Biochemistry & Molecular Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Genetics & Heredity GA PN138 UT WOS:A1994PN13800013 PM 7849703 ER PT J AU PATIL, N PETERSON, A ROTHMAN, A DEJONG, PJ MYERS, RM COX, DR AF PATIL, N PETERSON, A ROTHMAN, A DEJONG, PJ MYERS, RM COX, DR TI A HIGH-RESOLUTION PHYSICAL MAP OF 2.5-MBP OF THE DOWN-SYNDROME REGION ON CHROMOSOME-21 SO HUMAN MOLECULAR GENETICS LA English DT Article ID YEAST ARTIFICIAL CHROMOSOMES; RESTRICTION MAP; HUMAN DNA; GENERATION; CLONING; CLONES; CONTIG AB The region surrounding D21S55 in band 21q22 of human chromosome 21 has been implicated in the etiology of Down syndrome (DS). In this paper, we report the construction of a high resolution map of a 2.5 Mb region around the marker D21S55. Characterization of YAC clones by accurate size determination, end isolation and marker assignment was used to build a refined YAC-based map. The YAC clones were then used to isolate 284 cosmid clones, covering 2.3 Mb, from a chromosome 21-specific cosmid library. The cosmid clones were ordered into overlapping groups and a restriction map of each group was determined. The groups of cosmids were then ordered and oriented with respect to the YAC-based map. This high resolution map provides the framework for further analysis of the region by transcribed sequence mapping and sequence determination. C1 STANFORD UNIV,SCH MED,DEPT GENET,STANFORD,CA 94305. UNIV CALIF SAN FRANCISCO,DEPT PHYSIOL,SAN FRANCISCO,CA 94143. LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. NR 21 TC 34 Z9 34 U1 0 U2 2 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0964-6906 J9 HUM MOL GENET JI Hum. Mol. Genet. PD OCT PY 1994 VL 3 IS 10 BP 1811 EP 1817 DI 10.1093/hmg/3.10.1811 PG 7 WC Biochemistry & Molecular Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Genetics & Heredity GA PN138 UT WOS:A1994PN13800015 PM 7849705 ER PT J AU CANDY, JV SULLIVAN, EJ AF CANDY, JV SULLIVAN, EJ TI MODEL-BASED PROCESSING FOR A LARGE-APERTURE ARRAY SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article ID DYNAMIC-SYSTEMS; VERTICAL ARRAY; SHALLOW-WATER AB A model-based approach to solve a deep water ocean acoustic signal processing problem based on a state-space representation of the normal-mode propagation model is developed. The design of a model-based processor (MBP) for signal enhancement employing an array consisting of a large number of sensors for a deep ocean surveillance operation is discussed. The processor provides enhanced estimates of the measured pressure-field, modes, and residual (innovations) sequence indicating the performance or adequacy of the propagation model relative to the data. It is shown that due to the structure of the normal-mode model the state-space propagator is not only feasible for this large scale problem, but in fact, can be implemented by a set of decoupled parallel second-order processors, implying a real-time capability. In the paper we discuss the design and application of the processor to a realistic set of simulated pressure-field data developed from a set of experiments and sound speed parameters. C1 USN,CTR UNDERSEA WARFARE,DIV PHYS & TECHNOL,NEWPORT,RI 02841. RP CANDY, JV (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR ADV SIGNAL & IMAGE SCI,IMAGING & DETECT PROGRAM,LIVERMORE,CA 94550, USA. NR 22 TC 2 Z9 4 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 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD OCT PY 1994 VL 19 IS 4 BP 519 EP 528 DI 10.1109/48.338388 PG 10 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA PX325 UT WOS:A1994PX32500004 ER PT J AU HARSHMAN, PJ GUSTAFSON, TK KELLEY, PL BLUM, O AF HARSHMAN, PJ GUSTAFSON, TK KELLEY, PL BLUM, O TI STRONG-FIELD THEORY OF LOW-LOSS OPTICAL SWITCHING AND 3-WAVE MIXING IN A SEMICONDUCTOR QUANTUM-WELL SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID ELECTROMAGNETICALLY INDUCED TRANSPARENCY; RADIATIVE RENORMALIZATION; GAAS; SUSCEPTIBILITY; GENERATION; EXCITONS; TIME AB A density matrix analysis based on radiative renormalization predicts significant changes in band-edge absorption, index of refraction, and three-wave-mixing susceptibility in a quantum well when two conduction subbands are strongly coupled by an electromagnetic field. C1 UNIV CALIF BERKELEY,ELECTR RES LAB,BERKELEY,CA 94720. TUFTS UNIV,CTR ELECTROOPT TECHNOL,MEDFORD,MA 02155. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP HARSHMAN, PJ (reprint author), UNIV CALIF BERKELEY,DEPT ELECT ENGN & COMP SCI,BERKELEY,CA 94720, USA. NR 20 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 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD OCT PY 1994 VL 30 IS 10 BP 2297 EP 2303 DI 10.1109/3.328595 PG 7 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA PM813 UT WOS:A1994PM81300012 ER PT J AU DOERRY, AW AF DOERRY, AW TI PATCH DIAMETER LIMITATION DUE TO HIGH CHIRP RATES IN FOCUSED SAR IMAGES SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Letter AB Polar-format processed synthetic aperture radar (SAR) images have a limited focused patch diameter that results from unmitigated phase errors. Very high chirp rates, encountered with fine-resolution short-pulse radars, exasperate the problem via a residual video phase error term. This letter modifies the traditional maximum patch diameter expression to include effects of very high chirp rates. RP DOERRY, AW (reprint author), SANDIA NATL LABS,SAR DEPT 2345,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 5 TC 4 Z9 5 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD OCT PY 1994 VL 30 IS 4 BP 1125 EP 1129 DI 10.1109/7.328787 PG 5 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA PM678 UT WOS:A1994PM67800024 ER PT J AU FAZIO, MV STRINGFIELD, RM AF FAZIO, MV STRINGFIELD, RM TI THE 5TH SPECIAL ISSUE ON HIGH-POWER MICROWAVE GENERATION SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Editorial Material RP FAZIO, MV (reprint author), LOS ALAMOS NATL LAB,DIV ACCELERATOR TECHNOL,LOS ALAMOS,NM, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD OCT PY 1994 VL 22 IS 5 BP 495 EP 498 PG 4 WC Physics, Fluids & Plasmas SC Physics GA PT931 UT WOS:A1994PT93100001 ER PT J AU MORELAND, LD SCHAMILOGLU, E LEMKE, RW KOROVIN, SD ROSTOV, VV ROITMAN, AM HENDRICKS, FJ SPENCER, TA AF MORELAND, LD SCHAMILOGLU, E LEMKE, RW KOROVIN, SD ROSTOV, VV ROITMAN, AM HENDRICKS, FJ SPENCER, TA TI EFFICIENCY ENHANCEMENT OF HIGH-POWER VACUUM BWOS USING NONUNIFORM SLOW-WAVE STRUCTURES SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID OSCILLATORS AB The Sinus-6, a high-power relativistic repetitively-pulsed electron beam accelerator, is used to drive various slow wave structures in a BWO configuration in vacuum. Peak output power of about 550 MW at 9.45 GHz was radiated in an 8-ns pulse. We describe experiments which study the relative efficiencies of microwave generation from a two-stage nonuniform amplitude slow wave structure and its variations without an initial stage. Experimental results are compared with 2.5 D particle-in-cell computer simulations. Our results suggest that prebunching the electron beam in the initial section of the nonuniform BWO results in increased microwave generation efficiency. Furthermore, simulations reveal that, in addition to the backward propagating surface harmonic of the TM(01) mode, backward and forward propagating volume harmonics with phase velocity twice that of the surface harmonic play an important role in high-power microwave generation and radiation. C1 SANDIA NATL LABS,DEPT 1241,ALBUQUERQUE,NM 87131. RUSSIAN ACAD SCI,INST HIGH CURRENT ELECTR,SIBERIAN BRANCH,TOMSK 634055,RUSSIA. USAF,PHILLIPS LAB,ADV WEAPONS & SURVIVABIL DIRECTORATE,KIRTLAND AFB,NM 87117. RP MORELAND, LD (reprint author), UNIV NEW MEXICO,DEPT ELECT & COMP ENGN,PULSED POWER & PLASMA SCI LAB,ALBUQUERQUE,NM 87131, USA. RI Vladislav, Rostov/A-2031-2012; Rostov, Vladislav/O-6708-2014 NR 13 TC 67 Z9 77 U1 2 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 OCT PY 1994 VL 22 IS 5 BP 554 EP 565 DI 10.1109/27.338268 PG 12 WC Physics, Fluids & Plasmas SC Physics GA PT931 UT WOS:A1994PT93100011 ER PT J AU WALTER, MT GILGENBACH, RM MENGE, PR SPENCER, TA AF WALTER, MT GILGENBACH, RM MENGE, PR SPENCER, TA TI EFFECTS OF TAPERED TUBES ON LONG-PULSE MICROWAVE EMISSION FROM INTENSE E-BEAM GYROTRON-BACKWARD-WAVE-OSCILLATORS SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID ISX-B TOKAMAK; ELECTRON; FREQUENCY; POWER AB Experiments are reported on tapered-tube versus uniform-tube, gyrotron-backward-wave-oscillators (4.5-6 GHz) driven by an intense electron beam with parameters: 0.8 MV, 1-4 kA, and pulselength (0.5-1 mu s). Results show that, compared to a uniform interaction tube, a gyro-BWO with a 10% downtapered tube produces the following effects: 1) highest microwave peak-power (up to about 100 MW in internal tube), a factor of 2 higher than the uniform tube, 2) more reproducible long-pulse (400-500 ns) emission, and 3) the largest inferred-integrated energy (factor of 2.5-3 increase). Experiments show high power microwave spikes with lower power plateaus. Experimental observations are in qualitative agreement with MAGIC code simulations of uniform and tapered-tube gyro-BWO's. C1 SANDIA NATL LABS,ALBUQUERQUE,NM. USAF,PHILLIPS LAB,KIRTLAND AFB,NM. RP WALTER, MT (reprint author), UNIV MICHIGAN,DEPT NUCL ENGN,INTENSE ENERGY BEAM INTERACT LAB,ANN ARBOR,MI 48109, USA. NR 20 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 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD OCT PY 1994 VL 22 IS 5 BP 578 EP 584 DI 10.1109/27.338270 PG 7 WC Physics, Fluids & Plasmas SC Physics GA PT931 UT WOS:A1994PT93100013 ER PT J AU WANG, CB AF WANG, CB TI 3-DIMENSIONAL SIMULATION ANALYSIS OF A 3-CM WAVELENGTH FREE-ELECTRON LASER AFTERBURNER SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article AB We have simulated a 3 cm wavelength free-electron laser afterburner (FEL Afterburner) using two sets of parameters: one is for a 3-cm period wiggler and the other is for a 5.4 cm period wiggler. For the 3 cm period wiggler, the input beam energy is 112.5 keV, and for the 5.4 cm period wiggler the beam energy is increased to 290 keV to make the FEL Afterburner operate at the same frequency. It is found, from the simulations, that the FEL Afterburner with a longer period wiggler has a higher power conversion efficiency: larger than 16% $ for the 5.4 cm wiggler while only about 9% for the 3 cm wiggler. It is also shown that to enhance the interaction efficiency in the slow wave cavity, the slow wave number should be a little larger than the sum of the fast wave number and the wiggler wave number. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR BEAM PHYS,BERKELEY,CA 94720. YALE UNIV,DEPT PHYS,NEW HAVEN,CT 06520. RP WANG, CB (reprint author), UNIV ELECTR SCI & TECHNOL CHINA,HIGH ENERGY ELECTR RES INST,CHENGDU 610054,PEOPLES R CHINA. NR 8 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 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD OCT PY 1994 VL 22 IS 5 BP 649 EP 653 DI 10.1109/27.338278 PG 5 WC Physics, Fluids & Plasmas SC Physics GA PT931 UT WOS:A1994PT93100021 ER PT J AU CARYOTAKIS, G AF CARYOTAKIS, G TI HIGH-POWER MICROWAVE TUBES - IN THE LABORATORY AND ONLINE SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article AB The possibility of incapacitating the electronic circuits of hostile equipment with high-energy microwave pulses has created a demand for microwave tubes capable of very high peak pulsed powers. Experimentalists, primarily from the plasma physics community, have been working in this field, dubbed High-Power Microwave or HPM. Separately, research in high-energy physics requires electron-positron colliders with energies approaching 1 trillion electron-volts (1 terra-electron-volt, or TeV). Such accelerators must be powered by microwave sources that are very similar to some that are proposed for the HPM application. The paper points out that for these tubes to be used on-line in the manner intended, they must be designed and built to operate at a very high internal vacuum, which is not the case for many of the HPM laboratory projects. The development of a particular klystron at the Stanford Linear Accelerator Center is described in detail in order to illustrate the need for special facilities and strong Quality Control. Should the Defense requirements for HPM survive the end of the cold war, an effort should be made to coordinate the tube development activities serving these two widely disparate applications. RP CARYOTAKIS, G (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 4 TC 34 Z9 34 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 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD OCT PY 1994 VL 22 IS 5 BP 683 EP 691 PG 9 WC Physics, Fluids & Plasmas SC Physics GA PT931 UT WOS:A1994PT93100026 ER PT J AU CARLSTEN, BE FAEHL, RJ FAZIO, MV HAYNES, WB STRINGFIELD, RM AF CARLSTEN, BE FAEHL, RJ FAZIO, MV HAYNES, WB STRINGFIELD, RM TI INTENSE SPACE-CHARGE BEAM PHYSICS RELEVANT TO RELATIVISTIC KLYSTRON AMPLIFIERS SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article AB In this paper, we examine intense space-charge beam physics that is relevant to beam bunching and extraction in a mildly relativistic klystron amplifier, and give numerical examples for a 5 kA, 500 keV electron beam in a 1.3 GHz structure. Much of the peculiar beam physics in these types of devices results from the partitioning of beam energy into kinetic and potential parts. Both tenuous-nonrelativistic and intense-relativistic beams produce effects different in nature from those produced by intense, mildly relativistic beams because the potential energy requirements are either negligible or fixed. In particular, we demonstrate anomolous beam bunching aided by the nonlinear potential requirements and we discuss maximum power extraction as a function of beam bunching. We show that although the space-charge effects can produce quite high harmonic current content, the maximum power extraction from the beam into RF typically occurs at relatively modest bunching. RP CARLSTEN, BE (reprint author), LOS ALAMOS NATL LAB,MS H825,LOS ALAMOS,NM 87545, USA. NR 8 TC 20 Z9 25 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 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD OCT PY 1994 VL 22 IS 5 BP 719 EP 729 DI 10.1109/27.338288 PG 11 WC Physics, Fluids & Plasmas SC Physics GA PT931 UT WOS:A1994PT93100031 ER PT J AU CARLSTEN, BE FAEHL, RJ FAZIO, MV HAYNES, WB RYNE, RD STRINGFIELD, RM AF CARLSTEN, BE FAEHL, RJ FAZIO, MV HAYNES, WB RYNE, RD STRINGFIELD, RM TI BEAM-CAVITY INTERACTION PHYSICS FOR MILDLY RELATIVISTIC, INTENSE-BEAM KLYSTRON AMPLIFIERS SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article AB We examine beam-cavity interaction physics relevant to mildly relativistic, intense-beam klystron amplifiers. This is an interesting but difficult regime of operation, because of the combination of high beam current and low voltage. The advantage of this regime is that it is relatively easy to access high beam powers (and potentially high microwave output powers) at relatively low beam energy. We calculate the effect of the extremely high beam loading in the input and idler cavities. The output cavity's shunt impedance must match the low beam impedance in order to prevent high output gap voltages that will reflect electrons back upstream. This leads to very low cavity Q factors (< 10). We derive expressions for mode purity for such low-Q cavities and show that acceptable cavities can be designed, RP CARLSTEN, BE (reprint author), LOS ALAMOS NATL LAB,MS H825,LOS ALAMOS,NM 87545, USA. NR 12 TC 18 Z9 22 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD OCT PY 1994 VL 22 IS 5 BP 730 EP 739 DI 10.1109/27.338289 PG 10 WC Physics, Fluids & Plasmas SC Physics GA PT931 UT WOS:A1994PT93100032 ER PT J AU FAZIO, MV HAYNES, WB CARLSTEN, BE STRINGFIELD, RM AF FAZIO, MV HAYNES, WB CARLSTEN, BE STRINGFIELD, RM TI A 500-MW, 1-MU-S PULSE LENGTH, HIGH-CURRENT RELATIVISTIC KLYSTRON SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article AB This paper describes the experimental development of a long pulse high current relativistic klystron amplifier (RKA). The desired performance parameters are 1 GW output power and 1 mu s pulse length with an operating frequency of 1.3 GHz. Peak powers approaching 500 MW have been achieved in pulses of 1 mu s nominal baseline-to-baseline duration. The half power pulse width is 0.5 mu s. These pulses contain an energy of about 160 J. RF output rises linearly in concert with the beam current pulse, and terminates abruptly just before the highest part of the pulsed voltage curve is reached. A possible explanation, not yet experimentally confirmed, for the premature termination of the RF pulse is an output cavity gap voltage that is too high, causing electron reflection at the gap and RF breakdown across the gap. A new output cavity has been designed with a much lower shunt impedance and a loaded Q of 4. RP FAZIO, MV (reprint author), LOS ALAMOS NATL LAB,MSH 851,LOS ALAMOS,NM 87545, USA. NR 13 TC 24 Z9 32 U1 3 U2 4 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 OCT PY 1994 VL 22 IS 5 BP 740 EP 749 DI 10.1109/27.338290 PG 10 WC Physics, Fluids & Plasmas SC Physics GA PT931 UT WOS:A1994PT93100033 ER PT J AU WESTENSKOW, GA HOUCK, TL AF WESTENSKOW, GA HOUCK, TL TI RELATIVISTIC KLYSTRON 2-BEAM ACCELERATOR SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article AB Relativistic klystrons (RK's) are being developed as an RF power source for high gradient accelerator applications which include large linear electron-positron colliders, compact accelerators, and FEL sources. In a relativistic klystron two-beam accelerator (RK-TBA), the drive beam passes through a large number of RF output structures. High conversion efficiency of electron beam energy to RF energy is achieved in this concept by reacceleration of the modulated drive beam between output structures. We have conducted experiments studying the RF power extracted from various RK structures driven by modulated induction accelerator current pulses; our studies include work on improving the transport dynamics of the drive beam. We have started a demonstration in which the modulated induction beam current is reaccelerated by passage through subsequent induction accelerator cells. RP WESTENSKOW, GA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 10 TC 12 Z9 12 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD OCT PY 1994 VL 22 IS 5 BP 750 EP 755 DI 10.1109/27.338291 PG 6 WC Physics, Fluids & Plasmas SC Physics GA PT931 UT WOS:A1994PT93100034 ER PT J AU REES, DE TALLERICO, PJ HUMPHRIES, S AF REES, DE TALLERICO, PJ HUMPHRIES, S TI THE UNIFORM-FIELD MAGNICON - AN ARCHITECTURE MORE SUITABLE FOR HIGH-PERVEANCE BEAMS SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article AB This paper provides the details and modeling results of a 700-MHz, 2.5-MW, continuous wave, non-conventional magnicon architecture. It then compares the new architecture to the conventional design. The new magnicon architecture proves less sensitive to beam size yet provides the very high dc-to-RF conversion efficiency demonstrated in the initial magnicon development. The magnicon developments to date have utilized longitudinal, de magnetic fields with different field strengths in the deflection system and output cavity. While this transition between field strengths was used in the initial magnicon to assist in the conversion of the initial longitudinal beam energy into the transverse direction, it also spreads the beam bunch (for finite beam size), reducing conversion efficiency. The new magnicon architecture presented in this paper utilizes a constant focusing field over the entire device. Conventional and new magnicon designs are presented for the 700-MHz, 2.5-MW requirements. Large-signal modeling techniques are used to compare magnicon performance of these designs for large-diameter beams. The modeling techniques used to generate the self-consistent solutions for the beam-driven magnicon cavities are discussed, and the relationship between the magnicon efficiency and electron-beam diameter is presented. C1 UNIV NEW MEXICO,DEPT ELECT & COMP ENGN,ALBUQUERQUE,NM 87131. RP REES, DE (reprint author), LOS ALAMOS NATL LAB,DIV ACCELERATOR TECHNOL,LOS ALAMOS,NM 87545, USA. NR 13 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 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD OCT PY 1994 VL 22 IS 5 BP 773 EP 784 DI 10.1109/27.338293 PG 12 WC Physics, Fluids & Plasmas SC Physics GA PT931 UT WOS:A1994PT93100036 ER PT J AU CHOWDHURI, P MISHRA, AK MARTIN, PM MCCONNELL, BW AF CHOWDHURI, P MISHRA, AK MARTIN, PM MCCONNELL, BW TI THE EFFECTS OF NONSTANDARD LIGHTNING VOLTAGE WAVESHAPES ON THE IMPULSE STRENGTH OF SHORT AIR GAPS SO IEEE TRANSACTIONS ON POWER DELIVERY LA English DT Article; Proceedings Paper CT IEEE/PES 1994 Winter Meeting CY JAN 30-FEB 03, 1994 CL NEW YORK, NY SP IEEE, POWER ENGN SOC DE AIR GAPS; IMPULSE STRENGTH; LIGHTNING ID STEEP-FRONT; DURATION AB Sphere-sphere, rod-rod and rod-plane air gaps, each 5-cm long, were tested with lightning surges of eight voltage waves of both polarities. The critical breakdown voltage levels of the tested air gaps attained a minimum plateau within specific range of wavefronts of the lightning surges. Long time delays of breakdown for the fast-front and short time delays for the slow-front waves were observed. These phenomena would significantly affect the insulation coordination of the power apparatus and systems. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP CHOWDHURI, P (reprint author), TENNESSEE TECHNOL UNIV,COOKEVILLE,TN 38505, USA. NR 36 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 0885-8977 J9 IEEE T POWER DELIVER JI IEEE Trans. Power Deliv. PD OCT PY 1994 VL 9 IS 4 BP 1991 EP 1999 DI 10.1109/61.329531 PG 9 WC Engineering, Electrical & Electronic SC Engineering GA PP289 UT WOS:A1994PP28900027 ER PT J AU DURZAN, DJ VENTIMIGLIA, F AF DURZAN, DJ VENTIMIGLIA, F TI FREE TAXANES AND THE RELEASE OF BOUND COMPOUNDS HAVING TAXANE ANTIBODY REACTIVITY BY XYLANASE IN FEMALE, HAPLOID-DERIVED CELL-SUSPENSION CULTURES OF TAXUS-BREVIFOLIA SO IN VITRO CELLULAR & DEVELOPMENTAL BIOLOGY-PLANT LA English DT Article DE FREE AND BOUND TAXANES; TAXUS BREVIFOLIA; XYLANASE; HAPLOID CELL CULTURES ID WHITE SPRUCE; TAXOL; INVITRO; GROWTH AB Haploid cells derived from the female gametophyte of Taxus brevifolia produce multinucleate egglike cells that have grown as cell suspensions over a 5-yr period. Two new media are formulated, one without nitrates, to select for haploid cell lines and to enhance free taxane production when cell lines are artificially aged by withholding subculture. The cell suspensions produce bound taxanes that are detectable with anti-taxane monoclonal antibodies on cell surfaces and on particles released into the culture medium. Recovery and detection of bound taxanes are based on a competitive inhibition enzyme immunoassay (CIEIA). Tissues extracted exhaustively with methanol then treated with xylanase release CIEIA-detectable taxanes. Approximately 300% more taxanes were detected in the xylanase-treated tissue culture material versus the control. Wood (winter bark) taken from T. brevifolia and treated in the same way with xylanase released 20% more taxanes than could be detected in the control. RP DURZAN, DJ (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT ENVIRONM HORT,DAVIS,CA 95616, USA. NR 34 TC 15 Z9 15 U1 0 U2 1 PU SOC IN VITRO BIOLOGY PI UPPER MARLBORO PA 9315 LARGO DR W #255, UPPER MARLBORO, MD 20774-4755 SN 1054-5476 J9 IN VITRO CELL DEV-PL JI In Vitro Cell. Dev. Biol.-Plant PD OCT PY 1994 VL 30P IS 4 BP 219 EP 227 PG 9 WC Plant Sciences; Cell Biology; Developmental Biology SC Plant Sciences; Cell Biology; Developmental Biology GA PP650 UT WOS:A1994PP65000008 ER PT J AU CANNON, SD AF CANNON, SD TI WRITING SOFTWARE-COMPATIBLE DOCUMENTS SO INTERNATIONAL FORUM ON INFORMATION AND DOCUMENTATION LA English DT Article AB This article provides tips on how to create a document to be as compatible as possible when transferred from one type of computer hardware/software to another. RP CANNON, SD (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU INT FEDERAT INFORMATION & DOCUMENTATION PI THE HAGUE PA PO BOX 90402, 2509 LK THE HAGUE, NETHERLANDS SN 0304-9701 J9 INT FORUM INFORM DOC JI Int. Forum Inf. Doc. PD OCT PY 1994 VL 19 IS 3-4 BP 35 EP 36 PG 2 WC Information Science & Library Science SC Information Science & Library Science GA RP900 UT WOS:A1994RP90000005 ER PT J AU NGUYEN, HD PAIK, SH ROOD, AS AF NGUYEN, HD PAIK, SH ROOD, AS TI EFFECTS OF THERMALLY GENERATED CONVECTION ON THE MIGRATION OF RADIONUCLIDES IN SATURATED GEOLOGIC FORMATION SO INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE LA English DT Article ID MASS-TRANSFER; HEAT AB The problem of radionuclides migration in the presence of simultaneous forced and free convection in parallel flows is studied numerically by a hybrid spectral numerical technique. In this method, the momentum, energy, and mass conservation equations together with Boussinesq approximations are solved using a combined Galerkin and collocation method in conjunction with the backward Euler for time integration. Several cases are simulated with varying buoyancy parameter and Peclet number for prescribed thermal output and leach rates at the surface of a spherical canister. The results indicate that the actions of the buoyancy force are either to aid or oppose the main flow which can lead to an elongation of the concentration plume in the streamwise or transverse direction. It is also found that for a fixed Peclet number, influence of buoyancy force remains noticeable even when buoyancy parameter is an order of magnitude smaller than the Peclet number. RP NGUYEN, HD (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 7 TC 0 Z9 0 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0020-7225 J9 INT J ENG SCI JI Int. J. Eng. Sci. PD OCT PY 1994 VL 32 IS 10 BP 1605 EP 1614 DI 10.1016/0020-7225(94)90168-6 PG 10 WC Engineering, Multidisciplinary SC Engineering GA PF199 UT WOS:A1994PF19900008 ER PT J AU GRADY, DE KIPP, ME AF GRADY, DE KIPP, ME TI EXPERIMENTAL AND COMPUTATIONAL SIMULATION OF THE HIGH-VELOCITY IMPACT OF COPPER SPHERES ON STEEL PLATES SO INTERNATIONAL JOURNAL OF IMPACT ENGINEERING LA English DT Article AB High-velocity impact experiments were performed in which copper spheres struck hardened 4340 steel target plates. Velocities range between 3 and 5 km/s, and both normal and oblique impacts were performed. High-resolution flash radiography was used to diagnose the impact crater formation and debris motion within a time frame accessible to computational simulation. Witness plate and fragment capture methods were used to evaluate size and trajectory statistics of the ejecta fragment debris. The three-dimensional wave-code CTH was used to analyze the crater formation and debris evolution process. Simulated radiographs were constructed for direct comparison with X-ray data. RP GRADY, DE (reprint author), SANDIA NATL LABS,COMPUTAT SCI COMP SCI & MATH DIRECTORATE,ALBUQUERQUE,NM 87185, USA. NR 10 TC 8 Z9 8 U1 0 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0734-743X J9 INT J IMPACT ENG JI Int. J. Impact Eng. PD OCT PY 1994 VL 15 IS 5 BP 645 EP 660 DI 10.1016/0734-743X(94)90144-A PG 16 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA NZ772 UT WOS:A1994NZ77200004 ER PT J AU SHEN, YR AF SHEN, YR TI NONLINEAR-OPTICAL STUDIES OF POLYMER INTERFACES SO INTERNATIONAL JOURNAL OF NONLINEAR OPTICAL PHYSICS LA English DT Article ID 2ND HARMONIC-GENERATION; 2ND-HARMONIC GENERATION; LIQUID-CRYSTAL; COPPER DEPOSITION; CLUSTER FORMATION; SURFACE; POLYIMIDE; DIFFUSION; ALIGNMENT; MONOLAYERS AB Second-order nonlinear optical processes can be used as effective surface probes. They can provide some unique opportunities for studies of polymer interfaces. Here we describe two examples to illustrate the potential of the techniques. One is on the formation of metal/polymer interfaces. The other is on the alignment of liquid crystal films by mechanically rubbed polymer surfaces. C1 LAWRENCE LIVERMORE NATL LAB,DIV MAT SCI,LIVERMORE,CA 94550. RP SHEN, YR (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 37 TC 3 Z9 3 U1 0 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0218-1991 J9 INT J NONLINEAR OPT PD OCT PY 1994 VL 3 IS 4 BP 459 EP 468 DI 10.1142/S0218199194000250 PG 10 WC Optics; Physics, Applied SC Optics; Physics GA PV204 UT WOS:A1994PV20400003 ER PT J AU HILL, FS COX, AB SALMON, YL CANTU, AO LUCAS, JN AF HILL, FS COX, AB SALMON, YL CANTU, AO LUCAS, JN TI METAPHASE YIELDS FROM STAPHYLOCOCCAL-ENTEROTOXIN-A STIMULATED PERIPHERAL-BLOOD LYMPHOCYTES OF UNIRRADIATED AND IRRADIATED AGED RHESUS-MONKEYS SO INTERNATIONAL JOURNAL OF RADIATION BIOLOGY LA English DT Article ID HUMAN T-CELLS; CHROMOSOME TRANSLOCATIONS; PRIMATES; RADIATION AB The mitogen phytohemagglutinin (PHA) works well in both human and cynomolgus monkey (Macaca fascicularis) lymphocyte cultures to stimulate T cell proliferation. T cells from rhesus monkeys (Macaca mulatta) are less responsive than human cells, producing few metaphases when thousands are required, e.g. in biological dosimetry studies. We show that staphylococcal enterotoxin A (SEA), one of the most potent mitogens known, at a concentration of 0.5 mu g/ml stimulated peripheral lymphocytes to grow with a mitotic index (MI) averaging 0.13 metaphases/cell in old, irradiated rhesus macaques. This was significantly greater (p < 0.001) than that produced by PHA (MI < 0.01) in lymphocytes from the same animals. Whole blood was cultured for 96, 120 and 144 h for five irradiated individuals and for two controls. All cells cultured with SEA produced a high MI with a peak response at 120 h whereas the same cultures showed low MI for each PHA stimulated culture. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. USAF,ARMSTRONG LAB,BROOKS AFB,TX 78235. NR 13 TC 6 Z9 6 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0955-3002 J9 INT J RADIAT BIOL JI Int. J. Radiat. Biol. PD OCT PY 1994 VL 66 IS 4 BP 381 EP 384 DI 10.1080/09553009414551321 PG 4 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 PK947 UT WOS:A1994PK94700006 PM 7930840 ER PT J AU LUCAS, JN SWANSBURY, G CLUTTERBUCK, R HILL, F BURK, C STRAUME, T AF LUCAS, JN SWANSBURY, G CLUTTERBUCK, R HILL, F BURK, C STRAUME, T TI DISCRIMINATION BETWEEN LEUKEMIA AND NON-LEUKEMIA-RELATED CHROMOSOMAL-ABNORMALITIES IN THE PATIENTS LYMPHOCYTES SO INTERNATIONAL JOURNAL OF RADIATION BIOLOGY LA English DT Article ID RADIATION; TRANSLOCATIONS; HYBRIDIZATION; CELLS AB The inability to measure precancer-related genetic damage accurately in blood cells of patients with leukaemia or lymphoma has prevented the use in such patients of available biodosimetric methods to determine prior exposure to clastogenic agents. This is because a substantial amount of disease-related genetic damage appears in the blood cells of these patients, thus masking genetic damage that may have been caused prior to the disease. We describe a new approach that may be used to measure precancer-related chromosomal aberrations in such patients by totally separating the affected T lymphocytes from the malignant B lymphocytes. The approach employs stable chromosome translocations and will detect prior exposures above the detection limit of similar to 0.05-0.1 Gy. The utility of this approach is illustrated by using blood lymphocytes from a nuclear dockyard worker who claims his B cell leukaemia was induced by work-related radiation exposures. Blood lymphocytes were obtained after diagnosis of the disease, but prior to therapy, and measurements were made of the frequency of chromosomal abnormalities in PHA-stimulated lymphocytes without prior separation of T and B cells and in T lymphocytes after complete separation from B cells using a resetting technique. Results show that the separation of T cells prior to PHA stimulation eliminates the cancer-related chromosomal damage and thus appears to facilitate biodosimetry of pre-cancer exposures in such patients. C1 ROYAL MARSDEN HOSP,SUTTON SM2 5PT,SURREY,ENGLAND. RP LUCAS, JN (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94551, USA. NR 14 TC 1 Z9 1 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0955-3002 J9 INT J RADIAT BIOL JI Int. J. Radiat. Biol. PD OCT PY 1994 VL 66 IS 4 BP 385 EP 389 DI 10.1080/09553009414551331 PG 5 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 PK947 UT WOS:A1994PK94700007 PM 7930841 ER PT J AU PEKARSKI, P RABIN, Y GOTTLIEB, M AF PEKARSKI, P RABIN, Y GOTTLIEB, M TI SCALING APPROACH TO DIFFERENTIAL SWELLING OF POLYMER-SOLUTIONS AND GELS SO JOURNAL DE PHYSIQUE II LA English DT Article ID THETA-TEMPERATURE; DEPENDENCE; NETWORKS; POLY(DIMETHYLSILOXANE); ELASTICITY; SCATTERING; EQUATION; RUBBER; STATE; CHI AB The failure of the classical theories for swollen polymer networks was clearly demonstrated by recent differential swelling experiments of Gee, Eichinger and McKenna. We introduce a weaker form of the additivity assumption based on the separation of the gel into ''solid''-like and ''liquid''-like components. Using simple scaling arguments and the assumption that the effective solvent quality for a crosslinked polymer system is worse than for its uncrosslinked counterpart, we predict a similar anomaly of the swelling activity parameter (dilation modulus) in osmotic deswelling experiments in the semi-dilute range of concentration. The relevance to Eichinger's and McKenna's experiments on concentrated systems is discussed. C1 BEN GURION UNIV NEGEV,DEPT CHEM ENGN,IL-84105 BEER SHEVA,ISRAEL. KYOTO UNIV,YUKAWA INST THEORET PHYS,KYOTO 606,JAPAN. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87544. RP PEKARSKI, P (reprint author), BAR ILAN UNIV,DEPT PHYS,IL-52900 RAMAT GAN,ISRAEL. NR 30 TC 5 Z9 5 U1 0 U2 7 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 1155-4312 J9 J PHYS II JI J. Phys. II PD OCT PY 1994 VL 4 IS 10 BP 1677 EP 1685 PG 9 WC Mechanics; Physics, Atomic, Molecular & Chemical SC Mechanics; Physics GA PL725 UT WOS:A1994PL72500004 ER PT J AU VAIDYA, RU ZUREK, AK CASTRO, R WOLFENDEN, A HOSMAN, SL SUBRAMANIAN, KN AF VAIDYA, RU ZUREK, AK CASTRO, R WOLFENDEN, A HOSMAN, SL SUBRAMANIAN, KN TI ALUMINA-COATED TI-25AL-10NB-3V-1MO FOR IMPROVED OXIDATION RESISTANCE SO JOURNAL OF ADVANCED MATERIALS LA English DT Article ID ELEVATED-TEMPERATURES; DEFORMATION; FRACTURE; ALLOYS AB The potential use of plasma sprayed Al2O3 as an oxidation barrier for Ti-25Al-10Nb-3V-1Mo at high temperatures was investigated. The effectiveness of the coating was tested under conditions of cyclic oxidation. One cycle of the oxidation process involved exposing the sample at 1,000 degrees C for one hour followed by cooling to room temperature. Al2O3 was found to be very effective in preventing oxidation of the Ti-25Al-10Nb-3V-1Mo substrate. No significant elemental diffusion occurred between the coating and the substrate during cyclic oxidation. Cracks were observed to form in the Al2O3 layer in the vicinity of the interface, on completion of the thermal cycling experiments. Young's modulus and damping measurements were performed on the ascoated samples and samples cycled from 1,000 degrees C. C1 TEXAS A&M UNIV,DEPT MECH ENGN,ADV MAT LAB,COLLEGE STN,TX 77843. MICHIGAN STATE UNIV,DEPT MAT SCI & MECH,E LANSING,MI. RP VAIDYA, RU (reprint author), LOS ALAMOS NATL LAB,DIV MAT,LOS ALAMOS,NM, USA. NR 19 TC 6 Z9 6 U1 0 U2 0 PU SAMPE PUBLISHERS PI COVINA PA 1161 PARKVIEW DRIVE, COVINA, CA 91722 SN 1070-9789 J9 J ADV MATER JI J. Adv. Mater. PD OCT PY 1994 VL 26 IS 1 BP 16 EP 22 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA PJ902 UT WOS:A1994PJ90200003 ER PT J AU EDWARDS, PG WEYDERT, M PETRIE, MA ANDERSEN, RA AF EDWARDS, PG WEYDERT, M PETRIE, MA ANDERSEN, RA TI PREPARATION AND SYNTHETIC UTILITY OF MCL(4)(ME(2)NCH(2)CH(2)NME(2))(2), WHERE M IS URANIUM OR THORIUM SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID ADDUCTS AB UCl4 or ThCl4 dissolves in a solution of Me(2)NCH(2)CH(2)NMe(2) (tmed) in toluene to give green UCl4(tmed)(2) or colorless ThCl4(tmed)(2). Anion metathesis with Me(3)SiBr or Me(3)SiI gives UBr4(tmed)(x) or UI4(tmed)(x), where x lies between 1 and 2. The tmed complexes are useful synthons for other ligand complexes, as well as for (MeC(5)H(4))(3)ThClor (MeC(5)H(4))(4)Th. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. NR 8 TC 14 Z9 14 U1 1 U2 1 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 OCT PY 1994 VL 213 BP 11 EP 14 DI 10.1016/0925-8388(94)90873-7 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100004 ER PT J AU MOLLER, P NIX, JR AF MOLLER, P NIX, JR TI APPLICATIONS OF A GLOBAL NUCLEAR-STRUCTURE MODEL TO STUDIES OF THE HEAVIEST ELEMENTS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID FISSION HALF-LIVES; SUPERHEAVY NUCLEI; MASS FORMULA; HEAVY; BARRIERS AB We present some new results on heavy element nuclear structure properties calculated on the basis of the finite-range droplet model and folded Yukawa single-particle potential. Specifically, we discuss calculations of nuclear ground state masses and microscopic corrections, alpha decay properties, beta decay properties, fission potential energy surfaces, and spontaneous fission half-lives. These results, obtained with a global nuclear structure approach, are particularly reliable for describing the stability properties of the heaviest elements. RP MOLLER, P (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 37 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 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD OCT PY 1994 VL 213 BP 43 EP 49 DI 10.1016/0925-8388(94)90879-6 PG 7 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100010 ER PT J AU LOUGHEED, RW MOODY, KJ WILD, JF HULET, EK MCQUAID, JH LAZAREV, YA LOBANOV, YV OGANESSIAN, YT UTYONKOV, VK ABDULLIN, FS BUKLANOV, GV GIKAL, BN ILIEV, S MEZENTSEV, AN POLYAKOV, AN SEDYKH, IM SHIROKOVSKY, IV SUBBOTIN, VG SUKHOV, AM TSYGANOV, YS ZHUCHKO, VE AF LOUGHEED, RW MOODY, KJ WILD, JF HULET, EK MCQUAID, JH LAZAREV, YA LOBANOV, YV OGANESSIAN, YT UTYONKOV, VK ABDULLIN, FS BUKLANOV, GV GIKAL, BN ILIEV, S MEZENTSEV, AN POLYAKOV, AN SEDYKH, IM SHIROKOVSKY, IV SUBBOTIN, VG SUKHOV, AM TSYGANOV, YS ZHUCHKO, VE TI OBSERVATION OF ENHANCED NUCLEAR-STABILITY NEAR THE 162-NEUTRON SHELL SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID MULTIDIMENSIONAL DEFORMATION SPACE; SPONTANEOUS FISSION; HEAVIEST ELEMENTS; ISOTOPES AB In bombardments of Cm-248 With Ne-22 we discovered two new isotopes, (265)106 and (266)106, by establishing genetic links between a:decays of the 106 nuclides and spontaneous fission (SF) or alpha decays of the daughter (or granddaughter) nuclides. For (266)106 We measured E(alpha) = 8.63 +/- 0.05 MeV followed by the SF decay of (262)104 for which we measured a half-life value of 1.2(-0.5)(+1.0) s. For (265)106 we measured E(alpha) = 8.71-8.91 MeV. We estimated alpha half-lives of 10-30 s for (266)106 and 2-30 s for (265)106 with SF branches of approximately 50% or less. The decay properties of (266)106 indicate a large enhancement in the SF stability of this N = 160 nuclide and confirm the existence of the predicted deformed shells N = 162 and Z = 108. C1 JOINT INST NUCL RES,DUBNA 141980,RUSSIA. RP LOUGHEED, RW (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 25 TC 23 Z9 23 U1 0 U2 0 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 OCT PY 1994 VL 213 BP 61 EP 66 DI 10.1016/0925-8388(94)90881-8 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100012 ER PT J AU HOFFMAN, DC AF HOFFMAN, DC TI SPONTANEOUS FISSION SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID NUCLEI AB The spontaneous fission (SF) of the heaviest actinides and the transactinides is of particular interest, because of the dramatic changes in properties observed in the region of the heavy fermium isotopes and for still heavier elements. The existing experimental information on SF properties, including half-life systematics, fragment kinetic energy and mass yield distributions, prompt neutron emission and gamma emission, will be reviewed. Possibilities for extending studies of SF properties to other regions are considered, and the potential for obtaining additional information about low-energy fission properties is discussed. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. GT SEABORG INST TRANSACTINIUM SCI,LIVERMORE,CA 94550. RP HOFFMAN, DC (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,MS-70A-3307,BERKELEY,CA 94720, USA. NR 18 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 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD OCT PY 1994 VL 213 BP 67 EP 73 DI 10.1016/0925-8388(94)90882-6 PG 7 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100013 ER PT J AU WILD, JF HULET, EK LOUGHEED, RW MOODY, KJ BANDONG, BB DOUGAN, RJ VEECK, A AF WILD, JF HULET, EK LOUGHEED, RW MOODY, KJ BANDONG, BB DOUGAN, RJ VEECK, A TI SPONTANEOUS FISSION PROPERTIES OF NO-252,NO-254 AND (256,258)[104] AND THE DISAPPEARANCE OF THE OUTER FISSION BARRIER SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID HALF-LIVES; SYSTEMATICS; ISOTOPES; NUCLEI; MASS AB We have measured the mass and total kinetic energy distributions from the spontaneous fission of No-252, No-254, (256)[104] and (258)[104]. The results, in combination with earlier measurements for No-256, No-258 and No-262, show a sharp transition from asymmetrical mass division in No-256 to symmetrical division for No-258 and No-262. However, all isotopes of element 104, including (260)[104], appear to yield broadly symmetrical mass distributions. The total kinetic energies around 200 MeV for the element 104 isotopes indicate that they fission by the low-energy mode of bimodal fission. Recent calculations of static potential energy surfaces including higher-order asymmetric deformations suggest that the outer fission barrier is well below the ground state in energy, which accounts for the observance of the symmetric mass division. RP WILD, JF (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 36 TC 19 Z9 19 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 OCT PY 1994 VL 213 BP 86 EP 92 DI 10.1016/0925-8388(94)90885-0 PG 7 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100016 ER PT J AU GIBSON, JK HAIRE, RG GENSINI, MM OGAWA, T AF GIBSON, JK HAIRE, RG GENSINI, MM OGAWA, T TI ALLOYING BEHAVIOR IN SELECTED NEPTUNIUM BINARY-SYSTEMS - THE ROLE OF 5F BONDING SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID PHASE-DIAGRAM; NP; AM AB We have undertaken to establish the phase relations for selected binary alloy systems of Np with another actinide or with a d-block transition metal. Empirical data obtained by differential thermal analysis and powder X-ray diffraction have been supplemented by elementary modeling procedures and correlations with similar alloy systems to propose the primary features of selected phase diagrams. The initial focus of these investigations has been on the Np-Am, Np-Zr and, most recently, the Np-Fe systems. The findings for the former two systems are summarized, and preliminary results for the Np-Fe system are reported. The potential role of 5f bonding in determining alloying behavior is discussed in conjunction with regular-solution model predictions to address unique features evident in certain Np ahoy systems. C1 JAPAN ATOM ENERGY RES INST,TOKAI,IBARAKI 31911,JAPAN. RP GIBSON, JK (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 22 TC 12 Z9 12 U1 0 U2 0 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 OCT PY 1994 VL 213 BP 106 EP 110 DI 10.1016/0925-8388(94)90888-5 PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100019 ER PT J AU STEWART, GR ANDRAKA, B HAIRE, RG AF STEWART, GR ANDRAKA, B HAIRE, RG TI SPECIFIC-HEAT OF SOME TRANS-URANIUM INTERMETALLIC COMPOUNDS - SEARCH FOR HEAVY FERMIONS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID SYSTEM; SUPERCONDUCTIVITY; UPT3 AB We measured the low temperature specific heat of single-phase samples of PuRh2 PuGa3 and NpCd11. These materials are candidates for heavy fermion behavior based on their structures and, in the case of PuRh2, on other existing measurements such as magnetic susceptibility. We find rather large gamma values for PuGa3 (225 mJ mol(-1) K-2) and PuRh2 (145 mJ mol(-1) K-2), while that for NpCd11 (10 mJ mol(-1) K-2) is low enough to suggest that another channel of behavior (e.g. magnetism) uses up the available f-electron entropy. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV AUGSBURG,D-86135 AUGSBURG,GERMANY. RP STEWART, GR (reprint author), UNIV FLORIDA,DEPT PHYS,POB 118440,GAINESVILLE,FL 32611, USA. NR 9 TC 9 Z9 9 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD OCT PY 1994 VL 213 BP 111 EP 113 DI 10.1016/0925-8388(94)90889-3 PG 3 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100020 ER PT J AU LANDER, GH STIRLING, WG LANGRIDGE, S TANG, CC GIBBS, D AF LANDER, GH STIRLING, WG LANGRIDGE, S TANG, CC GIBBS, D TI RESONANT MAGNETIC-X-RAY SCATTERING - A NEW PROBE FOR ACTINIDES SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID EXCHANGE SCATTERING; NEUTRON-SCATTERING; POLARIZATION; DIFFRACTION; HOLMIUM; ABSORPTION; DICHROISM AB The magnetic cross-section for photons is small and difficult to observe; however, when the X-ray energy is tuned to certain absorption edges an enormous enhancement of the magnetic scattering cross-section is observed. This process is now understood in terms of atomic resonances. By chance, the largest enhancements, and most convenient for diffraction experiments, occur at the M edges (3.5-4.5 keV in the actinides, We shall give some examples of the work performed at the NSLS, Brookhaven National Laboratory. Our recent experiments have been on small single crystals of NpAs. The higher resolution available with X-ray synchrotron beams, compared with that at neutron sources, has allowed us to determine new features in bath the magnetic structure and the critical fluctuations just above T-N. Because of the high absorption of the X-rays, the technique is extremely sensitive to the near-surface region, and the results often exhibit significant differences to those determined from neutron diffraction, which examines the bulk of the material. Thus, the two techniques are complementary. Very small samples are all that is required for the synchrotron experiments; we estimate that the beam illuminates no more than 1 mu g of NpAs in this study, so that studies of the magnetic properties of transcurium materials become possible for the first time. C1 UNIV KEELE,DEPT PHYS,KEELE ST5 5BG,STAFFS,ENGLAND. BROOKHAVEN NATL LAB,DEPT PHYS,LONG ISL,NY 11973. RP LANDER, GH (reprint author), COMMISS EUROPEAN COMMUNITIES,JOINT RES CTR,INST TRANSURANIUM ELEMENTS,POSTFACH 2340,D-76125 KARLSRUHE,GERMANY. OI Langridge, Sean/0000-0003-1104-0772 NR 30 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 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD OCT PY 1994 VL 213 BP 114 EP 119 DI 10.1016/0925-8388(94)90890-7 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100021 ER PT J AU BREWER, L AF BREWER, L TI CALCULATION OF PHASE-DIAGRAMS OF THE ACTINIDES SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID THERMODYNAMIC PROPERTIES; MOLYBDENUM; MANGANESE; ELEMENTS AB The prediction of phase diagrams of actinides is difficult because, in addition to the use of s, p and d electrons, the use of f electrons in binding by the metals from Pa to Cf must be considered. Also, the actinides have an unusual number of electronic configurations of comparable stability considering promotion energies and bonding energies. The availability of different configurations with different sizes also makes it possible to achieve higher densities than one would expect for close-packed structures. Calculations of the thermodynamic stabilities of various structures for all pure actinides will be published shortly. We are calculating the thermodynamics and phase diagrams of the binary systems. In the space available here, I will discuss only systems with no intermediate phases using a modification of the regular-solution model which is normally expressed in terms of energies of vaporization from the condensed phase to the gaseous atom in the ground electronic state, which is appropriate for organic compounds for which the energy of vaporization is a measure of the van der Waals bonding. For most metals, the energy of vaporization is not a proper measurement of bonding energy as the electronic configuration in the condensed phase is different from that of the ground state of the gaseous atom. The correct bonding energy is the difference between the energy of the condensed phase and the energy of the gaseous atom with the same electronic configuration as the condensed phase. As an example, the Delta H-298/R value of 33.4 kK for the sublimation of b.c.c. Am to the gaseous ground state (f(7)s(2)) must be increased by 29.5 kK, the promotion energy to f(6)d(2)s, to obtain the bonding energy of 62.9 kK. Of this total bonding energy, 23.8 kK is due to the s electron, 35 kK is due to the two d electrons and 4.2 kK is the contribution due to f electron bonding. Examples will be given of the use of the modified regular-solution model for calculation of phase diagrams. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP BREWER, L (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 33 TC 8 Z9 8 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD OCT PY 1994 VL 213 BP 132 EP 137 DI 10.1016/0925-8388(94)90893-1 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100024 ER PT J AU LINK, P BRAITHWAITE, D WITTIG, J BENEDICT, U HAIRE, RG AF LINK, P BRAITHWAITE, D WITTIG, J BENEDICT, U HAIRE, RG TI RESISTIVITY AND SUPERCONDUCTIVITY OF AMERICIUM METAL UNDER PRESSURE UP TO 25-GPA SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article ID DELOCALIZATION; PHASE AB We report resistance data for americium metal under pressure up to 25 GPa and at temperatures down to 1.3 K. Samples of Am-243 with the double-hexagonal-closed-packed (d.h.c.p.) structure and also with the f.c.c. structure at ambient pressure were studied. The superconducting transition temperature of americium is shown to increase in both cases considerably with pressure, reaching a maximum value of 2.3 K at 6.6 GPa in the case of d.h.c.p. americium. The pressure variation of the superconducting critical temperature and the normal state properties of americium metal exhibit several anomalies, which are discussed with respect to phase transitions established by high pressure X-ray crystallography. C1 COMMISS EUROPEAN COMMUNITIES, JOINT RES CTR, INST TRANSURANIUM ELEMENTS, D-76125 KARLSRUHE, GERMANY. FORSCHUNGSZENTRUM JULICH, INST FESTKORPERFORSCH, D-52425 JULICH, GERMANY. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. NR 17 TC 11 Z9 11 U1 0 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD OCT PY 1994 VL 213 BP 148 EP 152 DI 10.1016/0925-8388(94)90895-8 PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100026 ER PT J AU KLEINSCHMIDT, PD AF KLEINSCHMIDT, PD TI THERMOCHEMISTRY OF THE ACTINIDES SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID SUBLIMATION; FLUORIDES AB The measurement of equilibria by Knudsen effusion techniques and the enthalpy of formation of the actinide atoms are briefly discussed. Thermochemical data on the sublimation of the actinide fluorides are used to calculate the enthalpies of formation and entropies of the gaseous species. Estimates are made for enthalpies and entropies of the tetrafluorides and trifluorides for those systems where data is not available. The pressure of important species in the tetrafluoride sublimation processes is calculated based on this thermochemical data. RP KLEINSCHMIDT, PD (reprint author), LOS ALAMOS NATL LAB,MS G-730,POB 1663,LOS ALAMOS,NM 87545, USA. NR 17 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 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD OCT PY 1994 VL 213 BP 169 EP 172 DI 10.1016/0925-8388(94)90898-2 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100029 ER PT J AU HAIRE, RG AF HAIRE, RG TI HIGH-TEMPERATURE VAPORIZATION OF TRANSPLUTONIUM OXIDES SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE AB A systematic evaluation of the vaporization-decomposition behavior of the actinide oxides as a function of atomic number has been initiated. This work has provided important clues for understanding the underlying roles played by the actinide's f-electrons in this process. Studies of the actinide sesquioxides have determined that the major factor in determining their primary mode of vaporization is the magnitude of dissociation energies of the monoxides. It has been shown that the dissociation energy of the monoxide is linked to the promotion energy of the actinide element's f-electrons. Establishing this relationship has now provided both a predictive and a correlative approach to understanding the vaporization processes of the actinide sesquioxides. Results from our initial vaporization studies of selected transplutonium sesquioxides were found to be in accord with these predicted processes. This systematic correlation, recent information about the melting points of berkelium and californium sesquioxides, and a summary of the initial high-temperature vaporization behaviors of several transplutonium sesquioxides are presented here. RP HAIRE, RG (reprint author), OAK RIDGE NATL LAB,DIV CHEM,POB 2008,OAK RIDGE,TN 37831, USA. NR 20 TC 33 Z9 35 U1 0 U2 1 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 OCT PY 1994 VL 213 BP 185 EP 190 DI 10.1016/0925-8388(94)90901-6 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100032 ER PT J AU HAY, PJ MARTIN, RL AF HAY, PJ MARTIN, RL TI THEORETICAL-STUDIES OF THE STRUCTURES AND ELECTRONIC-PROPERTIES OF U(NH2)(3) AND NP(NH2)(3) SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID CHEMISTRY AB The electronic structure of the model compounds U(NH2)(3) and Np(NH2)(3) is investigated with the aid of ab initio electronic structure techniques. The electronic ground states and equilibrium geometries of these complexes are determined using multiconfiguration SCF techniques. The ground state and low-lying excited states of U(NH2)(3) are found to arise from the (5f)(2) (6d)(1) and (5f)(3) configurations on the metal. The lowest state of the (5f)(2) (6d)(1) and (Sf)(3) configurations are comparable in energy. NP(NH2)(3) utilizes the (5f)(4) configuration, with the (5f)(3) (6d)(1) configuration lying about 2 eV higher in energy. Comparisons are made to the AnL(3) counterparts with L=CH3. RP HAY, PJ (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,MS B268,LOS ALAMOS,NM 87545, USA. NR 11 TC 4 Z9 4 U1 0 U2 0 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 OCT PY 1994 VL 213 BP 196 EP 198 DI 10.1016/0925-8388(94)90903-2 PG 3 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100034 ER PT J AU LIU, GK JURSICH, G HUANG, J BEITZ, JV WILLIAMS, CW AF LIU, GK JURSICH, G HUANG, J BEITZ, JV WILLIAMS, CW TI LINEAR AND NONLINEAR SPECTROSCOPY OF TETRAVALENT ACTINIDE IONS IN CEF4 SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID FLUORESCENCE; SPECTRA; GLASSES AB This paper reports laser spectroscopy studies on the tetravalent actinide ions Bk4+ and Cf4+ doped into CeF4. Fluorescence line narrowing (FLN) and spectral hole burning were applied to unravel the complex 5f state spectra that arise from inhomogeneous line broadening and the presence of two intrinsic metal ion sites. When a persistent spectral hole was burned in an inhomogeneously broadened zero phonon line of 1 at.% Cf4+ in CeF4, satellite spectral holes were also observed in other inhomogeneously broadened lines of Cf4+. In the FLN spectra of 0.1 at.% Bk4+ in CeF4, a linear relationship was observed between the excitation-laser photon energy and the energies of the Bk4+ emission lines. These experimental results can be understood in terms of one limit of a general model of inhomogeneous broadening, namely the limit in which there is a one-to-one correspondence between the optical transition energy and local structure in a disordered system. RP LIU, GK (reprint author), ARGONNE NATL LAB,DIV CHEM,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 11 TC 2 Z9 2 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 OCT PY 1994 VL 213 BP 207 EP 211 DI 10.1016/0925-8388(94)90905-9 PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100036 ER PT J AU FRANCIS, AJ AF FRANCIS, AJ TI MICROBIAL TRANSFORMATIONS OF RADIOACTIVE-WASTES AND ENVIRONMENTAL RESTORATION THROUGH BIOREMEDIATION SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article ID DISSOLUTION; BACTERIA AB Bioremediation stabilizes and reclaims radionuclides and toxic metals from contaminated materials, soils, sediments, or wastes. The mechanism of microbial transformations of the radionuclides and toxic metals commonly found in energy wastes are summarized, and two processes for treating such wastes are described. In one process, anaerobic bacteria are used to concentrate, contain and stabilize the toxic metals and radionuclides in the waste, with a concurrent reduction in its volume, In the second process, the radionuclides and toxic metals are extracted from the wastes with citric acid which is then subjected to biodegradation, followed by photodegradation to recover the metals. RP FRANCIS, AJ (reprint author), BROOKHAVEN NATL LAB, DEPT APPL SCI, UPTON, NY 11973 USA. NR 26 TC 36 Z9 40 U1 1 U2 6 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD OCT PY 1994 VL 213 BP 226 EP 231 DI 10.1016/0925-8388(94)90908-3 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100039 ER PT J AU HEFFNER, RH AF HEFFNER, RH TI MUON SPIN RELAXATION STUDIES OF THE INTERPLAY BETWEEN MAGNETISM AND SUPERCONDUCTIVITY IN HEAVY-FERMION SYSTEMS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID PHASE-DIAGRAM; ANTIFERROMAGNETIC ORDER; PHENOMENOLOGICAL THEORY; UPT3; SCATTERING; URU2SI2; STATES AB The interplay between magnetism and superconductivity in heavy fermion systems is discussed and the role of muon spin relaxation in elucidating these properties is emphasized. Relevant properties of all six heavy fermion superconductors are briefly surveyed and instances where superconductivity and magnetism compete, coexist and couple with one another are pointed out. Current theoretical concepts underlying these phenomena are highlighted. RP HEFFNER, RH (reprint author), LOS ALAMOS NATL LAB,DIV MAT,MS K764,LOS ALAMOS,NM 87545, USA. NR 35 TC 3 Z9 3 U1 1 U2 1 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 OCT PY 1994 VL 213 BP 232 EP 237 DI 10.1016/0925-8388(94)90909-1 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100040 ER PT J AU AXE, JD GRUBEL, G LANDER, GH AF AXE, JD GRUBEL, G LANDER, GH TI STRUCTURE AND PHASE-TRANSFORMATIONS IN URANIUM METAL SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID CHARGE-DENSITY-WAVE; ALPHA-URANIUM; NEUTRON-SCATTERING; STATE AB In common with other elemental actinides, metallic uranium exists in several allotropic forms, differing from one another by complex but subtle atomic rearrangements. This article reviews progress in understanding the successive phase transformations from the perspective of soft-mode instabilities. C1 EUROPEAN SYNCHROTRON RADIAT FACIL,F-38043 GRENOBLE,FRANCE. INST TRANSURANIUM ELEMENTS,KARLSRUHE,GERMANY. RP AXE, JD (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 24 TC 13 Z9 13 U1 2 U2 7 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 OCT PY 1994 VL 213 BP 262 EP 267 DI 10.1016/0925-8388(94)90914-8 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100045 ER PT J AU ERIKSSON, O WILLS, JM SODERLIND, P MELSEN, J AHUJA, R BORING, AM JOHANSSON, B AF ERIKSSON, O WILLS, JM SODERLIND, P MELSEN, J AHUJA, R BORING, AM JOHANSSON, B TI CRYSTALLOGRAPHIC PHASE-TRANSITIONS IN ACTINIDE METALS AS A FUNCTION OF PRESSURE SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID BRILLOUIN-ZONE; SPECIAL POINTS; SYSTEMS; BAND AB We present first-principles calculations of the equilibrium volumes and crystal structures of the light actinides (Th-Pu). The calculated equilibrium volumes for f.c.c. Th, b.c.t. Pu, alpha-U, and beta-Np are found to agree reasonably well with the experimental data, and when comparing the total energies of the b.c.c., f.c.c., b.c.t., alpha-U, and beta-Np structures we obtain the correct crystal structures for all studied systems. Also, the calculated equilibrium volumes for Th-Pu, using a hypothetical f.c.c. structure, have been calculated and it is demonstrated that although spin-orbit coupling is included in these calculations the calculated equilibrium volume of Pu is smaller than for Np, in disagreement with experiment. Moreover, the calculated tetragonal elastic constant, C', is shown to be negative for b.c.c. U, b.c.c. Np, b.c.c. Pu and f.c.c. Pu. Thus, our zero temperature calculations suggest that the b.c.c. structure is unstable for these elements and that f.c.c. Pu is also unstable. This is in conflict with experiment and we are led to the conclusion that temperature effects must be of crucial importance for stabilizing cubic structures in U, Np, and Pu. Further, as a function of decreasing volume we predict a crystal structure sequence f.c.c. --> b.c.t. --> f.c.c. in Th, a sequence alpha-U --> b.c.t. --> b.c.c, in U, and a sequence beta-Np --> b.c.t. --> b.c.c. in Np. Also, a sequence of transitions in Sc as a function of decreasing volume have been calculated, namely h.c.p. --> f.c.c. --> omega --> beta-Np --> b.c.c. C1 LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP ERIKSSON, O (reprint author), UPPSALA UNIV,DEPT PHYS,BOX 530,UPPSALA,SWEDEN. RI Eriksson, Olle/E-3265-2014 OI Eriksson, Olle/0000-0001-5111-1374 NR 29 TC 12 Z9 12 U1 1 U2 7 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 OCT PY 1994 VL 213 BP 268 EP 277 DI 10.1016/0925-8388(94)90915-6 PG 10 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100046 ER PT J AU NASH, KL AF NASH, KL TI ACTINIDE PHOSPHONATE COMPLEXES IN AQUEOUS-SOLUTIONS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID METHANE DIPHOSPHONIC ACIDS; STABILITY; CONSTANTS AB Complexes formed by actinides with carboxylic acids, polycarboxylic acids, and aminopolycarboxylic acids play a central role in both the basic and the process chemistry of the actinides. Recent studies of f element complexes with phosphonic acid ligands indicate that new ligands incorporating doubly ionizable phosphonate groups (-PO3H2) have many properties which are unique chemically, and promise more efficient separation processes for waste clean-up and environmental restoration. Simple diphosphonate ligands form much stronger complexes than isostructural carboxylates, often exhibiting higher solubility as well. In this manuscript recent studies of the thermodynamics and kinetics of f element complexation by 1,1- and 1,2-diphosphonic acid ligands are described. RP NASH, KL (reprint author), ARGONNE NATL LAB,DIV CHEM,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 18 TC 33 Z9 33 U1 2 U2 6 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 OCT PY 1994 VL 213 BP 300 EP 304 DI 10.1016/0925-8388(94)90919-9 PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100050 ER PT J AU VEIRS, DK SMITH, CA BERG, JM ZWICK, BD MARSH, SF ALLEN, P CONRADSON, SD AF VEIRS, DK SMITH, CA BERG, JM ZWICK, BD MARSH, SF ALLEN, P CONRADSON, SD TI CHARACTERIZATION OF THE NITRATE COMPLEXES OF PU(IV) USING ABSORPTION-SPECTROSCOPY, N-15 NMR, AND EXAFS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID STABILITY-CONSTANTS AB The nitrate complexes of Pu(IV) are studied in solutions containing nitrate at concentrations up to 13 molar (M) using absorption spectroscopy, N-15 nuclear magnetic resonance (NMR), and extended X-ray absorption fine structure (EXAFS). Four major nitrate complexes are observed and identified as PU(NO3)(3+), PU(NO3)(2)(2+), Pu(NO3)(4), and Pu(NO3)(6)(2-). The Pu(NO3)(3)(1+) and Pu(NO3)(5)(1-) complexes are not observed here and an upper limit of 0.10 can be set on the fraction for each of these species. C1 LOS ALAMOS NATL LAB,DIV MECH & ELECTR ENGN,LOS ALAMOS,NM 87545. RP VEIRS, DK (reprint author), LOS ALAMOS NATL LAB,DIV NUCL MAT TECHNOL,POB 1663,LOS ALAMOS,NM 87545, USA. NR 12 TC 32 Z9 32 U1 0 U2 10 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 OCT PY 1994 VL 213 BP 328 EP 332 PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100055 ER PT J AU MILLS, TR REESE, LW AF MILLS, TR REESE, LW TI SEPARATION OF PLUTONIUM AND AMERICIUM BY LOW-TEMPERATURE FLUORINATION SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID DIOXYGEN DIFLUORIDE AB We have demonstrated separation of Pu and in-grown Am using the gaseous reagent dioxygen difluoride. Aged PuF4 was fluorinated at room temperature to generate PuF6 gas, which was trapped separately and reduced to PuF4. The reaction product contained very little Am. Unreacted solid had elevated concentrations of Am that were consistent with a material balance. Use of a gaseous reagent and product enabled remote handling during reaction and purification. This result demonstrated a simple and minimal waste alternative that may have application to a number of actinide purification problems. RP MILLS, TR (reprint author), LOS ALAMOS NATL LAB,BOX 1663,MS E510,LOS ALAMOS,NM 87545, USA. NR 3 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD OCT PY 1994 VL 213 BP 360 EP 362 DI 10.1016/0925-8388(94)90931-8 PG 3 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100062 ER PT J AU SANDENAW, TA AF SANDENAW, TA TI TWINNING AS A CLUE TO A CDW-LIKE BEHAVIOR AND TO A LACK OF SME IN PLUTONIUM METAL SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID PHASES; TRANSITION; MECHANISM AB The twinning systems of alpha phase Pu metal have been reported by Zocco et al. (Proc. XII Int. Congr. for Electron Micros., 1990, p. 1014). Twinning modes and charge-density wave (CDW) states have both been reported for the CDW materials 2HTaSe(2), and TiNi alloys. The latter alloys also show shape memory effect (SME). The similarities in properties of alpha-Pu and TiNi alloys have recently been pointed out by Sandenaw (J. Nucl. Mater., 189 (1992) 343). A possible clue to a CDW-like behavior and a lack of SME in alpha-Pu may be in the twinning systems observed. Microtwinning has been suggested as interfering with flow of itinerant electrons and thus causing a rise in electrical resistivity as reported for the TiNi alloys (Wang et at. J. Appl. Phys., 43 (1972) 97). The latter workers report a one-to-one correspondence between mechanical ''memory'' effect and electrical resistivity. alpha-U exists with many twinning modes (Frank, Act Metall., I (1953) 71) but does not show any CDW behavior except at low temperatures. Therefore, twinning alone cannot be the source of a CDW-like behavior in alpha-Pu metal Bak (Rep. Prog. Phys., 45 (1982) 587) explained that the conduction electron density in a distorted phase is spacially modulated to form the CDW which accompanies the periodic lattice distortion (PLD). There appear to be competing periodicities (a PLD) in the complex alpha-Pu structure because the eight crystallographically different Pu atoms of the unit cell are seen to occur in a different but reproducible pattern in each of three directions on the a-c plane of the distorted pseudo hexagonal structure (Smith et al., ACS Symp. Series, No. 216, Plutonium Chemistry (1983) Fig. 1). It is suggested that the modulation of the conduction electrons, in three competing periodicities (chains) of the alpha-Pu lattice, should result in three different competing CDW-like states. The interference between three different CDW-like states may lead to the inability to see any one CDW-like state in alpha-Pu by neutron diffraction. The alpha-Pu structure is more complex than those of the CDW materials 2HTaSe(2) and TiNi alloys which also show twinning and a hexagonal structure. The twinning planes and twinning (shear) directions of single-crystal TiNi have been described with only the number one and zeros. (Miyazaki and Wayman, Acta Metal, 36 (1988) 181). The twinning planes and twinning directions of alpha-Pu were described by Zocco et al. with the numbers 1, 2, 3, 5 and 7 (and zeros). The greater complexity of twinning systems in alpha-Pu metal may explain an inability to see CDW states by TEM. This complexity could explain the lack of SME in Pu metal. RP SANDENAW, TA (reprint author), LOS ALAMOS NATL LAB,MS-J-565,LOS ALAMOS,NM 87545, USA. NR 12 TC 0 Z9 0 U1 1 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 OCT PY 1994 VL 213 BP 363 EP 365 DI 10.1016/0925-8388(94)90932-6 PG 3 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100063 ER PT J AU PETERSON, JR AF PETERSON, JR TI PHASE-BEHAVIOR OF ACTINIDE TRIHALIDES UNDER PRESSURE SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID CRYSTAL-STRUCTURE; ABSORPTION-SPECTRA; ELEMENT COMPOUNDS; LUMINESCENCE; LANTHANIDE; RAMAN; HALIDES; NDBR3; GPA AB Actinide trihalides exhibit in common a limited number of crystal structures. The range of existence of each structure correlates well with the cationic:anionic radius ratio. It is the efficiency of packing of the actinide cations and halide anions that determines which crystal structure is exhibited by a particular actinide trihalide. It appears that the packing efficiency and this ionic radius ratio control the high pressure phase behavior of the actinide trihalides as well. From other studies of lanthanide trihalides under pressure, the following series of crystal structures, in order of increasing packing efficiency, can be derived: AlCl3-type monoclinic --> BiI3-type rhombohedral --> UCl3-type hexagonal --> PuBr3-type orthorhombic. Arguments based on cation coordination number (CN) changes with increasing pressure can be used to justify this series of structures and to speculate on the identity of a new, even higher pressure phase that f element trihalides may exhibit. We have used several spectroscopic techniques to monitor the phase behavior of selected f element trihalides under pressure. The results of our studies are summarized, correlated with packing efficiency, and used to propose the potential existence of a ''new'', higher pressure, trihalide phase with a cation CN of 6. C1 OAK RIDGE NATL LAB,DIV CHEM,TRANSURANIUM RES LAB,OAK RIDGE,TN 37831. RP PETERSON, JR (reprint author), UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996, USA. NR 22 TC 2 Z9 2 U1 0 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD OCT PY 1994 VL 213 BP 394 EP 397 DI 10.1016/0925-8388(94)90942-3 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100073 ER PT J AU GENSINI, MM HAIRE, RG GIBSON, JK AF GENSINI, MM HAIRE, RG GIBSON, JK TI INVESTIGATION OF THE NEPTUNIUM-ZIRCONIUM SYSTEM BY X-RAY-DIFFRACTION SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE AB X-ray powder diffraction analysis at 25 degrees C has been used to further characterize the Np-Zr phase diagram. We have studied a variety of Np-Zr aggregate compositions obtained by different preparative methods, including are melting of the components. For the materials at ambient temperature, obtained by either slow cooling or quenching from elevated temperatures, we observed one or more of the following product phases: alpha-Np, alpha-Zr, NpZr2 and one new phase. The last was interpreted tentatively to be either Np4Zr or Np6Zr. Calculations based on the X-ray data suggested a limited solubility of Np in alpha-Zr and an even lower solubility of Zr in alpha-Np. The X-ray data for the NpZr2 phase showed that it possesses hexagonal symmetry and is isostructural with UZr2 and PuZr2. Annealing of Np-Zr composites at selected temperatures did not enhance the formation of NpZr2. RP GENSINI, MM (reprint author), OAK RIDGE NATL LAB,TRANSURANIUM RES LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 12 TC 8 Z9 8 U1 0 U2 0 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 OCT PY 1994 VL 213 BP 402 EP 405 DI 10.1016/0925-8388(94)90944-X PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100075 ER PT J AU LAWSON, AC GOLDSTONE, JA CORT, B SHELDON, RI FOLTYN, EM AF LAWSON, AC GOLDSTONE, JA CORT, B SHELDON, RI FOLTYN, EM TI ATOMIC THERMAL VIBRATIONS OF THE LIGHT ACTINIDE ELEMENTS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE AB We have been using time-of-flight neutron powder diffraction to determine the Debye-Waller factors of the light actinide elements. The Debye-Waller factor is a measure of the mean-square atomic displacement that arises from the thermal motion of the atoms in any solid. Its temperature dependence determines a Debye-Waller temperature Theta(DW) that is characteristic of the elastic properties of the solid. The data are obtained by Rietveld analysis of neutron diffraction powder patterns obtained at several temperatures. We have analyzed the results for alpha-U, alpha-Np, alpha-Pu and delta-Pu0.95Al0.05. The measured temperature dependence of the Theta(DW) can be interpreted with an ''effective'' Grueisen constant, whose numerical values are much too high to be explained with harmonic forces. RP LAWSON, AC (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 10 TC 27 Z9 28 U1 1 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD OCT PY 1994 VL 213 BP 426 EP 428 DI 10.1016/0925-8388(94)90951-2 PG 3 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100082 ER PT J AU HUBENER, S EICHLER, B SCHADEL, M BRUCHLE, W GREGORICH, KE HOFFMAN, DC AF HUBENER, S EICHLER, B SCHADEL, M BRUCHLE, W GREGORICH, KE HOFFMAN, DC TI THERMOCHROMATOGRAPHIC STUDIES OF HEAVY ACTINIDES IN METAL COLUMNS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE AB The adsorption of californium, einsteinium, and ferminium on polycrystalline titanium, iron, niobium, molybdenum, and tantalum was studied by the thermochromatographic technique. The adsorption behaviour of the actinides under study varied in dependence on the adsorbent metal. Enthalpies of adsorption evaluated from the experimental data are in correspondence with partial molar enthalpies of adsorption, which were calculated with a semi-empirical method. C1 PAUL SCHERRER INST,CH-5232 VILLIGEN,SWITZERLAND. GESELL SCHWERIONENFORSCH MBH,D-64220 DARMSTADT,GERMANY. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP HUBENER, S (reprint author), ROSSENDORF INC,RES CTR,POSTFACH 510119,D-01314 DRESDEN,GERMANY. NR 8 TC 6 Z9 6 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD OCT PY 1994 VL 213 BP 429 EP 432 DI 10.1016/0925-8388(94)90952-0 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100083 ER PT J AU CAMPBELL, GM NELSON, TO PARKER, JL GETTY, RH HERGERT, TR LINDAHL, KA PEPPERS, LG AF CAMPBELL, GM NELSON, TO PARKER, JL GETTY, RH HERGERT, TR LINDAHL, KA PEPPERS, LG TI ELECTROLYTIC DECONTAMINATION OF CONDUCTIVE MATERIALS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE AB Using the electrolytic method, we have demonstrated removal of Pu and Am from contaminated conductive material. At EG&G/Rocky Flats, we electrolytically decontaminated stainless steel. Results from this work show removal of fixed contamination, including the following geometries: planar, large radius, bolt holes, glove ports, and protruding studs. More specifically, fixed contamination was reduced from levels ranging from > 1 000 000 counts per minute (cpm) down to levels ranging from 1500 to 250 cpm using the electrolytic method. More recently, the electrolytic work has continued at Los Alamos National Laboratory as a joint project with EG&G/Rocky Flats, Impressively, electrolytic decontamination of Pu/Am from U surfaces (10 cm(2) per side) shows decreases in swipable contamination from 500 000-1 500 000 disintegrations per minute (dpm) down to 0-2 dpm. Moreover, the solid waste product of the electrolytic method is reduced in volume by more than 50 times compared with the liquid waste produced by the previous U decontamination method - a hot concentrated acid spray leach process. C1 LOS ALAMOS NATL LAB,DIV NUCL MAT,LOS ALAMOS,NM 87545. EG&G ROCKY FLATS INC,MST,GOLDEN,CO 80402. OI Peppers, Larry/0000-0002-3571-7680 NR 5 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 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD OCT PY 1994 VL 213 BP 450 EP 452 DI 10.1016/0925-8388(94)90958-X PG 3 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100089 ER PT J AU KRUPA, JC SIMONI, E SYTSMA, J EDELSTEIN, N AF KRUPA, JC SIMONI, E SYTSMA, J EDELSTEIN, N TI OPTICAL SPECTROSCOPIC STUDIES OF URANYL CHLORIDE UO2CL2 SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID ELECTRONIC-STRUCTURE; ION; SPECTRUM AB The first part of this work concerns essentially a qualitative energy level diagram of UO2Cl2 deduced from analysis of absorption and emission optical spectra recorded at low temperature. It describes the energy spacing of unoccupied orbitals. In the second part, the configuration coordinate model is used to explain successfully the shape of broadband transitions which are attributed to electron transfer from the last occupied orbital to orbitals showing a large 6d character. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP KRUPA, JC (reprint author), CNRS,INST PHYS NUCL,IN2P3,F-91406 ORSAY,FRANCE. NR 20 TC 8 Z9 8 U1 0 U2 0 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 OCT PY 1994 VL 213 BP 471 EP 474 DI 10.1016/0925-8388(94)90964-4 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100095 ER PT J AU WRUCK, DA RUSSO, RE SILVA, RJ AF WRUCK, DA RUSSO, RE SILVA, RJ TI THERMAL LENS SPECTROSCOPY OF PLUTONIUM USING A LASER-DIODE AND FIBER OPTICS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE AB A thermal lens spectrometer for the analysis of Pu(VI) in liquids is described. The use of fiber optics and a pulsed laser diode excitation source results in a compact system which can be adapted to measurements in process streams or in the field. The detection limit is 1x10(-6) M Pu(VI) at 831 nm. The performance of the laser-diode-based spectrometer for Pu(VI) detection is comparable with that of dye-laser-based photothermal or photoacoustic spectroscopy. RP WRUCK, DA (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV NUCL CHEM,LIVERMORE,CA 94550, USA. NR 9 TC 5 Z9 5 U1 0 U2 0 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 OCT PY 1994 VL 213 BP 481 EP 483 DI 10.1016/0925-8388(94)90966-0 PG 3 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100097 ER PT J AU BERG, JM AF BERG, JM TI LOW-TEMPERATURE ABSORPTION-SPECTRA AND GROUND-STATE ELECTRONIC-STRUCTURE OF TETRAKIS(2,6-DI-TERT-BUTYLPHENOXIDE)URANIUM(IV) SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE AB We present low temperature visible and near-IR intra-5f(2) electronic absorption spectra of U(O-2,6-t-Bu(2)C(6)H(3))(4), a compound of near-T-d point group symmetry about the uranium. The ground state is tentatively assigned as having E symmetry in T-d, because the number of symmetry-allowed transitions is close to the number which we observed. Transitions out of an excited state 90 cm(-1) above the ground state were also observed. This state is assigned to A(1) symmetry, again based on counting transitions. These assignments are consistent with magnetic susceptibility measurements. RP BERG, JM (reprint author), LOS ALAMOS NATL LAB,DIV NUCL MAT TECHNOL,LOS ALAMOS,NM 87545, USA. NR 3 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD OCT PY 1994 VL 213 BP 497 EP 499 DI 10.1016/0925-8388(94)90971-7 PG 3 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100102 ER PT J AU GOUDER, T COLMENARES, CA AF GOUDER, T COLMENARES, CA TI SURFACE-REACTIONS AND BULK DIFFUSION OF U OVERLAYERS ON PD SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE AB Thin layers of U on polycrystalline Pd and Pd(100) have been prepared by magnetron sputter deposition at room temperature. Mode of growth, annealing-induced surface rearrangement, bulk diffusion, reactivity towards CO and O-2 and surface electronic structure have been studied by Auger electron spectroscopy, X-ray photoelectron spectroscopy and UV photoelectron spectroscopy. At low coverages the U 5f electrons are localized and the reactivity is suppressed up to the point where CO dissociation becomes and activated process. The U stays on the top surface where it is atomically dispersed. At higher coverages U becomes reactive as shown by the spontaneous U-Pd interdiffusion and the dissociation of CO. O-2 always reacts with the surface oxidizing U to UO2 and annealing always triggers diffusion of U into Pd. Two types of diffusion are observed: one at temperatures below 250 degrees C which results in U-Pd surface compound formation and one at temperatures above 300 degrees C, which is associated with bulk diffusion of U. RP GOUDER, T (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 5 TC 0 Z9 0 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD OCT PY 1994 VL 213 BP 500 EP 502 DI 10.1016/0925-8388(94)90972-5 PG 3 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100103 ER PT J AU ROBINSON, RA LAWSON, AC SECHOVSKY, V HAVELA, L KERGADALLAN, Y NAKOTTE, H DEBOER, FR AF ROBINSON, RA LAWSON, AC SECHOVSKY, V HAVELA, L KERGADALLAN, Y NAKOTTE, H DEBOER, FR TI MAGNETIC AND CRYSTALLOGRAPHIC STRUCTURES IN UTX INTERMETALLIC COMPOUNDS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID UPDSN; HYBRIDIZATION; ANISOTROPY; ORDER; UAUSN; UNISN AB Uranium, together with other actinides and lanthanides, forms a large group of ternary intermetallic compounds of stoichiometry UTX (T=transition metal, X=p electron metal). These compounds are formed in several structure types and the occurrence and stability of particular structures with respect to the transition metal content suggests reasonable systematics. We have also investigated the magnetic structures of selected UTX compounds and it is revealing to relate the crystallographic and magnetic structures, because of the relationship between the magnetic symmetry and that of the U atom environment produced by the 5f-ligand hybridization, and the consequent anisotropic exchange. Those of ZrNiAl structure type are collinear, with moments along the hexagonal c axis. In the orthorhombic TiNiSi structure type, the moments are confined to the b-c plane (perpendicular to the uranium chains) and the structures are often incommensurate. In the hexagonal CaIn2 (or GaGeLi) structure type, the magnetic structures form in an orthorhombic cell and, at ]east in the disordered centric group, again the moments lie perpendicular to the nearest-neighbour uranium spacing. C1 CHARLES UNIV,PRAGUE,CZECH REPUBLIC. COMMISS EUROPEAN COMMUNITIES,JOINT RES CTR,INST TRANSURANIUM ELEMENTS,W-7500 KARLSRUHE,GERMANY. UNIV AMSTERDAM,AMSTERDAM,NETHERLANDS. RP ROBINSON, RA (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. RI Sechovsky, Vladimir/A-5256-2008 OI Sechovsky, Vladimir/0000-0003-1298-2120 NR 27 TC 16 Z9 16 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD OCT PY 1994 VL 213 BP 528 EP 532 DI 10.1016/0925-8388(94)90980-6 PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100111 ER PT J AU SECHOVSKY, V HAVELA, L PURWANTO, A LARSON, AC ROBINSON, RA PROKES, K NAKOTTE, H BRUCK, E DEBOER, FR SVOBODA, P MALETTA, H WINKELMANN, M AF SECHOVSKY, V HAVELA, L PURWANTO, A LARSON, AC ROBINSON, RA PROKES, K NAKOTTE, H BRUCK, E DEBOER, FR SVOBODA, P MALETTA, H WINKELMANN, M TI MAGNETIC PHASES IN UNIGE SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE ID SERIES; HEAT; UTGE; PD AB Antiferromagnetic ordering in UNiGe below 50 K has been confirmed by specific-heat, magnetization, electrical resistivity and neutron-diffraction studies. Between 41.5 and 50 K, an incommensurate AF phase with q=(0,1/2,-1/2)+/-delta(0,1,1), delta=0.141 (at 46 K) appears, whereas a commensurate AF structure with q=(0,1/2,1/2) sets on below 41.5 K. In magnetic fields (parallel to the c-axis) sufficient for a metamagnetic transition both the structures are transformed to a phase with q=(0,1/3,1/3) yielding a non-zero magnetization M approximate to 1/3M(s). C1 LOS ALAMOS NATL LAB,LOS ALAMOS NEUTRON SCATTERING CTR,LOS ALAMOS,NM 87545. UNIV AMSTERDAM,VAN DER WAALS ZEEMAN LAB,1018 XE AMSTERDAM,NETHERLANDS. HAHN MEITNER INST BERLIN GMBH,BENSC,D-14109 BERLIN,GERMANY. RP SECHOVSKY, V (reprint author), CHARLES UNIV,DEPT MET PHYS,KE KARLOVU 5,CR-12116 PRAGUE 2,CZECH REPUBLIC. RI Bruck, Ekkes/E-3365-2014; Sechovsky, Vladimir/A-5256-2008; OI Sechovsky, Vladimir/0000-0003-1298-2120; Bruck, Ekkes/0000-0002-5063-3338 NR 8 TC 8 Z9 8 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD OCT PY 1994 VL 213 BP 536 EP 539 DI 10.1016/0925-8388(94)90982-2 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100113 ER PT J AU PERRY, RT AF PERRY, RT TI ESTIMATION OF NEUTRON RADIATION-DAMAGE FROM ACTINIDE DECAY AND FISSION IN THE HANFORD WASTE TANKS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT International Conference on Actinides CY SEP 19-24, 1993 CL SANTE FE, NM SP LOS ALAMOS NATL LAB, GTS INST TRANSACTINIUM SCI, INT SCI FDN, INT ATOMIC ENERGY AGCY, LAWRENCE LIVERMORE NATL LAB, US DOE AB The absolute neutron flux in a Hanford Site waste tank at Richland, Washington, was estimated to ascertain if significant radiation damage had occurred in the steel wall of the tank. The tank contains actinides of various species and other radioactive material in various concentrations in approximately 1 million gallons of waste sludge. A conservative estimate of the neutron sources from the spontaneous fission and (alpha, n) reactions resulting from the decay of the actinides was made using the SOURCES code. This neutron source was used in a neutron transport calculation to determine the multiplication resulting from actinide fission and the subsequent neutron fluxes. The radiation fluence, hydrogen production, helium production, and displacements per atom in the steel walls were calculated using the absolute neutron fluxes. The results show that the fluxes are so small that the radiation damage should be insignificant. RP PERRY, RT (reprint author), LOS ALAMOS NATL LAB,REACTOR DESIGN & ANAL GRP,POB 1663,LOS ALAMOS,NM 87545, USA. NR 9 TC 0 Z9 0 U1 1 U2 1 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 OCT PY 1994 VL 213 BP 560 EP 562 DI 10.1016/0925-8388(94)90988-1 PG 3 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PN811 UT WOS:A1994PN81100119 ER PT J AU JEMIAN, PR ALLEN, AJ AF JEMIAN, PR ALLEN, AJ TI THE EFFECT OF THE SHAPE FUNCTION ON SMALL-ANGLE SCATTERING ANALYSIS BY THE MAXIMUM-ENTROPY METHOD SO JOURNAL OF APPLIED CRYSTALLOGRAPHY LA English DT Article ID X-RAY-SCATTERING; INDIRECT TRANSFORMATION METHOD; PARTICLE-SIZE DISTRIBUTIONS; STEELS; SANS AB Analysis of small-angle scattering data to obtain a particle-size distribution is dependent upon the shape function used to model the scattering. From a maximum-entropy analysis of small-angle scattering data, the effect of shape-function selection on the obtained size distribution is demonstrated using three different shape functions to describe the same scattering data from each of two alloys. The alloys have been revealed by electron microscopy to contain a distribution of randomly oriented and mainly noninteracting irregular ellipsoidal precipitates. A comparison is made between the different forms of the shape function. The effect of an incident-wavelength distribution is also shown. The importance of testing appropriate shape functions and validating these against other microstructural studies is discussed. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. UNIV MARYLAND,DEPT PHYS,COLLEGE PK,MD 20742. NIST,DIV CERAM,GAITHERSBURG,MD 20899. RI USAXS, APS/D-4198-2013 NR 31 TC 14 Z9 14 U1 0 U2 6 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 OCT 1 PY 1994 VL 27 BP 693 EP 702 DI 10.1107/S0021889894000373 PN 5 PG 10 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA PP424 UT WOS:A1994PP42400003 ER PT J AU WRIGHT, SI AF WRIGHT, SI TI ESTIMATION OF SINGLE-CRYSTAL ELASTIC-CONSTANTS FROM TEXTURED POLYCRYSTAL MEASUREMENTS SO JOURNAL OF APPLIED CRYSTALLOGRAPHY LA English DT Article AB A method for estimating single-crystal elastic constants given the elastic constants and texture of a polycrystal is outlined for hexagonal crystal symmetry. The method is based on the Voigt and Reuss polycrystal-average formulations. Sample calculations are detailed for titanium diboride and wire-drawn and rolled copper. The influences of possible sources of error on the estimation scheme are examined. RP WRIGHT, SI (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 16 TC 17 Z9 17 U1 1 U2 3 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 OCT 1 PY 1994 VL 27 BP 794 EP 801 DI 10.1107/S0021889894001883 PN 5 PG 8 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA PP424 UT WOS:A1994PP42400017 ER PT J AU HEBNER, GA GREENBERG, KE RILEY, ME AF HEBNER, GA GREENBERG, KE RILEY, ME TI ELECTRIC-FIELDS IN HIGH-FREQUENCY PARALLEL-PLATE HELIUM DISCHARGES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID LASER-INDUCED FLUORESCENCE; GLOW-DISCHARGE; RADIOFREQUENCY DISCHARGES; CATHODE SHEATH; DC DISCHARGE; SPECTROSCOPY; SIMULATIONS; DIAGNOSTICS; MODEL; ATOMS AB Spatially and temporally resolved electric fields in the sheath region of a 13.56-MHz, parallel-plate helium discharge have been measured as a function of voltage, pressure, phase, bias, and electrode drive configuration. The electric field was determined from laser-induced fluorescence measurements of the Stark structure of the n = 11 singlet Rydberg manifold. Two-dimensional maps of the electric field indicate that the field is uniform across a large fraction of the electrode diameter. Measured values of the sheath electric field are compared with the results of a hybrid Boltzmann-equation-average-equation simulation. RP HEBNER, GA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 32 TC 22 Z9 22 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 1 PY 1994 VL 76 IS 7 BP 4036 EP 4044 DI 10.1063/1.357351 PG 9 WC Physics, Applied SC Physics GA PK458 UT WOS:A1994PK45800012 ER PT J AU AGER, JW HAN, S PRUSSIN, SG WAGNER, RS PAN, LS KANIA, DR LANE, SM AF AGER, JW HAN, S PRUSSIN, SG WAGNER, RS PAN, LS KANIA, DR LANE, SM TI SPATIALLY-RESOLVED MEASUREMENT OF LATTICE DAMAGE IN ALPHA-PARTICLE-IRRADIATED TYPE-IIA NATURAL DIAMOND BY CONFOCAL PHOTOLUMINESCENCE MICROSCOPY SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID FILMS AB Confocal fluorescence microscopy has been used to measure the three-dimensional distribution of the H3 color center produced in type IIa natural diamonds by 5 MeV He+ irradiation at a total fluence of 8 x 10(15) cm-2. The peak of the H3 emission occurs 16 mum below the surface of the irradiated side of the diamond, which is in fair agreement with the peak of the vacancy distribution predicted by a Monte Carlo calculation (transport of ions in matter or TRIM). The H3 distribution is broader in the direction normal to the surface (10 mum full width at half maximum) than the TRIM calculation. This is attributed to diffusion of vacancies caused by self-annealing during irradiation. C1 UNIV CALIF BERKELEY,DEPT NUCL ENGN,BERKELEY,CA 94720. LOS ALAMOS NATL LAB,DIV ELECTR,LOS ALAMOS,NM 87545. LAWRENCE LIVERMORE NATL LAB,LASER PROGRAM,LIVERMORE,CA 94550. RP AGER, JW (reprint author), LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720, USA. OI Ager, Joel/0000-0001-9334-9751 NR 14 TC 5 Z9 5 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 1 PY 1994 VL 76 IS 7 BP 4050 EP 4053 DI 10.1063/1.357353 PG 4 WC Physics, Applied SC Physics GA PK458 UT WOS:A1994PK45800014 ER PT J AU SCHMIDT, B EREMIN, V IVANOV, A STROKAN, N VERBITSKAYA, E LI, Z AF SCHMIDT, B EREMIN, V IVANOV, A STROKAN, N VERBITSKAYA, E LI, Z TI RELAXATION OF RADIATION-DAMAGE IN SILICON PLANAR DETECTORS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID IRRADIATED SILICON; INTERSTITIAL DEFECT; CARBON; IDENTIFICATION; ELECTRON AB The behavior of radiation-induced carbon-related defects in high-resistivity silicon detectors has been investigated. The defects were introduced by alpha-particle irradiation and investigated by deep-level transient spectroscopy. An unusual defect behavior consists in low-temperature annealing, including self-annealing at room temperature, of the interstitial carbon C(i) with a simultaneous increase of the C(i)-O(i)-complex concentration. The kinetic parameters of the process have been determined from the increase of the C(i)-center concentration versus time. Two annealing velocities have been observed, which arise from different heat treatments during the detector fabrication process. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP SCHMIDT, B (reprint author), FORSCHUNGSZENTRUM ROSSENDORF,POB 510119,D-01314 DRESDEN,GERMANY. RI Verbitskaya, Elena/D-1521-2014 NR 16 TC 15 Z9 15 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 1 PY 1994 VL 76 IS 7 BP 4072 EP 4076 DI 10.1063/1.357356 PG 5 WC Physics, Applied SC Physics GA PK458 UT WOS:A1994PK45800018 ER PT J AU DIMOS, D WARREN, WL SINCLAIR, MB TUTTLE, BA SCHWARTZ, RW AF DIMOS, D WARREN, WL SINCLAIR, MB TUTTLE, BA SCHWARTZ, RW TI PHOTOINDUCED HYSTERESIS CHANGES AND OPTICAL STORAGE IN (PB,LA)(ZR,TI)O3 THIN-FILMS AND CERAMICS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID PHOTOCONDUCTOR IMAGE STORAGE; DISPLAY DEVICES; PLZT CERAMICS AB Pb(Zr,Ti)O3 and (Pb,La)(Zr,Ti)O3 thin films and bulk ceramics are shown to exhibit two distinct, but related types of photoinduced changes in their hysteresis behavior: (1) a photoinduced suppression of the switchable polarization and (2) a photoinduced voltage shift. Both effects give rise to stable and reproducible hysteresis changes and, thus, either could be the basis of an optical memory. Both phenomena can be explained by trapping of photogenerated charge at domain boundaries to minimize internal depolarizing fields. The space-charge field that causes the voltage-shift effect is primarily due to the migration and subsequent trapping of electrons. However, the thickness dependence of the voltage shift implies that the trapped charge is not confined to the interface. The voltage-shift kinetics exhibit a stretched-exponential dependence, whereas the polarization-suppression effect follows an exponential time dependence. However, both effects exhibit similar relaxation times. In addition, the relaxation time for the voltage-shift effect decreases with increasing light intensity according to a power-law relationship, tauis-proportional-toI-n, where 0.67 < n < 0.75. RP DIMOS, D (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 22 TC 216 Z9 225 U1 1 U2 31 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 OCT 1 PY 1994 VL 76 IS 7 BP 4305 EP 4315 DI 10.1063/1.357316 PG 11 WC Physics, Applied SC Physics GA PK458 UT WOS:A1994PK45800051 ER PT J AU MAHAN, GD AF MAHAN, GD TI THERMIONIC REFRIGERATION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID NEGATIVE ELECTRON AFFINITY; SPACE-CHARGE; MODEL; CS; SURFACE AB A refrigerator is described that is based upon thermionic emission. Room-temperature refrigeration is efficient when the work function of the anode is about 0.3-0.4 eV but those low values are unattainable. The refrigerator only operates at higher temperatures. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP MAHAN, GD (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. NR 20 TC 124 Z9 129 U1 5 U2 16 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 OCT 1 PY 1994 VL 76 IS 7 BP 4362 EP 4366 DI 10.1063/1.357324 PG 5 WC Physics, Applied SC Physics GA PK458 UT WOS:A1994PK45800060 ER PT J AU REYNA, LG SOBEHART, JR AF REYNA, LG SOBEHART, JR TI LASER-ABLATION OF MULTILAYER POLYMER-FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID POLYIMIDE; PHOTOABLATION; PULSES; UV AB We study the efficiency of using multilayer structures as an etch-stop mechanism in the ablation of polyimide films by ultraviolet lasers. The study is done using a photothermal model that includes the light absorption by the decomposed fragments, which shield the polymer from the laser beam, an intermediate zone in which the polymer is suffering a phase transition and the underlying unburned material. The layers are differentiated from each other through the optical properties. Variation in the optical properties of polyimide has been achieved by a proper selection of impurities. From our modeling work, we conclude that optically thin foils may be used as etch stop in the ablation process when the penetration depth of the middle layer is around three times larger than the penetration depth of the surrounding layers, this for fluences below 200 mJ/cm2. We also present some experimental results. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES B258,LOS ALAMOS,NM 87545. RP REYNA, LG (reprint author), IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598, USA. NR 26 TC 12 Z9 12 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 1 PY 1994 VL 76 IS 7 BP 4367 EP 4371 DI 10.1063/1.357325 PG 5 WC Physics, Applied SC Physics GA PK458 UT WOS:A1994PK45800061 ER PT J AU SOLOMON, IC MOTEKAITIS, AM WONG, MKC KAUFMAN, MP AF SOLOMON, IC MOTEKAITIS, AM WONG, MKC KAUFMAN, MP TI NMDA RECEPTORS IN CAUDAL VENTROLATERAL MEDULLA MEDIATE REFLEX AIRWAY DILATION ARISING FROM THE HINDLIMB SO JOURNAL OF APPLIED PHYSIOLOGY LA English DT Article DE GLUTAMATE; CONTROL OF AIRWAY CALIBER; EXERCISE; AUTONOMIC NERVOUS SYSTEM; MICROINJECTION; DOGS ID CENTRAL NERVOUS-SYSTEM; AMINO-ACID RECEPTORS; MUSCULAR-CONTRACTION; NEURONS; STIMULATION; VAGAL; DOGS; RAT; RESISTANCE; AFFERENTS AB The caudal ventrolateral medulla (CVLM) has been shown to participate in the reflex airway dilation evoked by stimulation of thin fiber afferents innervating the hindlimb of anesthetized dogs. Nevertheless, the pharmacological mechanism in the CVLM by which hindlimb afferents evoke this reflex airway dilation is not known. Therefore, we examined the role played by excitatory amino acid receptors in the CVLM in the reflex airway dilation arising from the hindlimb. Using chloralose-anesthetized dogs, we found that bilateral microinjections into the CVLM of either (+/-)-3-(2-carboxypiperazin-4-yl)-propyl-1-phosphonic acid (25 mM, 50 nl) or (+/-)-2-amino-5-phosphonovaleric acid (50 mM, 50 nl), both of which block N-methyl-D-aspartate (NMDA) receptors, reversibly attenuated the decrease in total lung resistance that was evoked by either electrical stimulation of C-fibers in the sciatic nerve or by static contraction of both gastrocnemius muscles. In contrast, bilateral microinjection into the CVLM of 6-cyano-7-nitroquinoxaline-2,3-dione (39 mu M, 50 nl), which blocks non-NMDA receptors, augmented the reflex decrease in total lung resistance that was evoked by either sciatic nerve stimulation or contraction of the gastrocnemius muscles. Bilateral microinjections of xanthurenic acid (100 mM, 50 nl) into the CVLM had no effect on the decrease in total lung resistance that was evoked by sciatic nerve stimulation. We conclude that NMDA, but not non-NMDA, receptors in the CVLM play an important role in the reflex are that dilates the airways when hindlimb afferents are stimulated by either muscular contraction or electrical stimulation. C1 LAWRENCE LIVERMORE NATL LAB, DEPT INTERNAL MED, DIV CARDIOVASC MED, DAVIS, CA 95616 USA. LAWRENCE LIVERMORE NATL LAB, DEPT HUMAN PHYSIOL, DAVIS, CA 95616 USA. FU NHLBI NIH HHS [HL-40910, HL-07682] NR 25 TC 8 Z9 8 U1 0 U2 0 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 OCT PY 1994 VL 77 IS 4 BP 1697 EP 1704 PG 8 WC Physiology; Sport Sciences SC Physiology; Sport Sciences GA PL694 UT WOS:A1994PL69400020 PM 7836189 ER PT J AU TRENT, JD GABRIELSEN, M JENSEN, B NEUHARD, J OLSEN, J AF TRENT, JD GABRIELSEN, M JENSEN, B NEUHARD, J OLSEN, J TI ACQUIRED THERMOTOLERANCE AND HEAT-SHOCK PROTEINS IN THERMOPHILES FROM THE 3 PHYLOGENETIC DOMAINS SO JOURNAL OF BACTERIOLOGY LA English DT Note ID STRESS PROTEINS; ARCHAEBACTERIUM; ACCUMULATION; SULFOLOBUS; EXPRESSION; CELLS; GENE AB Thermophilic organisms from each of the three phylogenetic domains (Bacteria, Archaea, and Eucarya) acquired thermotolerance after heat shock. Bacillus caldolyticus grown at 60 degrees C and heat shocked at 69 degrees C for 10 min showed thermotolerance at 74 degrees C, Sulfolobus shibatae grown at 70 degrees C and heat shocked at 88 degrees C for 60 min show ed thermotolerance at 95 degrees C, and Thermomyces lanuginosus grown at 50 degrees C and heat shocked at 55 degrees C for 60 min showed thermotolerance at 58 degrees C. Determinations of protein synthesis during heat shock revealed differences in the dominant heat shock proteins for each species. For B. caldolyticus, a 70-kDa protein dominated while for S. shibatae, a 55-kDa protein dominated and for T. lanuginosus, 31- to 33-kDa proteins dominated. Reagents that disrupted normal protein synthesis during heat shock prevented the enhanced thermotolerance. C1 UNIV COPENHAGEN,INST MOLEC BIOL,DK-3708 COPENHAGEN,DENMARK. RP TRENT, JD (reprint author), ARGONNE NATL LAB,CTR MECH BIOL & BIOTECHNOL,9700 S CASS AVE,CMB-202,ARGONNE,IL 60439, USA. RI Jensen, Bo/N-5082-2014 OI Jensen, Bo/0000-0002-0414-8999 NR 30 TC 49 Z9 51 U1 0 U2 1 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0021-9193 J9 J BACTERIOL JI J. Bacteriol. PD OCT PY 1994 VL 176 IS 19 BP 6148 EP 6152 PG 5 WC Microbiology SC Microbiology GA PJ904 UT WOS:A1994PJ90400037 PM 7928981 ER PT J AU STAFFELBACH, H KOLLER, T BURKS, C AF STAFFELBACH, H KOLLER, T BURKS, C TI DNA STRUCTURAL PATTERNS AND NUCLEOSOME POSITIONING SO JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS LA English DT Article ID NUCLEASE-SENSITIVE REGIONS; SIMIAN VIRUS-40 CHROMATIN; RIBOSOMAL-RNA GENES; B-DNA; SACCHAROMYCES-CEREVISIAE; DROSOPHILA-MELANOGASTER; BASE SEQUENCE; DEHYDROGENASE GENE; PROTEIN-BINDING; HELIX STRUCTURE AB There is no clear picture to date of the mechanisms determining nucleosome positioning. Generally, local DNA sequence signals (sequence-dependent positioning) or non-local signals (e.g. boundary effects) are possible. We have analyzed the DNA sequences of a series of positioned and mapped nucleosome cores in a systematic search for local sequence signals. The data set consists of 113 mapped nucleosome cores, mapped in vivo, in situ, or in reconstituted chromatin. The analysis focuses on the periodic distribution of sequence elements implied by each of six different published DNA structural models. We have also investigated the periodic distribution of all mono-, di-, and trinucleotides. An identical analysis was performed on a set of isolated chicken nucleosome cores (nucleosome data from the literature) that are presumably positioned due to local sequence signals. The results show that the sequences of the isolated nucleosome cores have a number of characteristic features that distinguish them clearly from randomly chosen reference DNA. This confirms that the positioning of these nucleosomes is mainly sequence-dependent (i.e., dependent on local octamer-DNA interactions) and that our algorithms are able to detect these patterns. Using the same algorithms, the sequences of the mapped nucleosome cores, however, are on average very similar to randomly chosen reference DNA. This suggests that the position of the majority of these nucleosomes can not be attributed to the sequence patterns implemented in our algorithms. The arrangement of positioned nucleosomes seems to be the result of a dynamic interplay of octamer-DNA interactions, nucleosome-nucleosome interactions and other positioning signals with varying relative contributions along the DNA. C1 LOS ALAMOS NATL LAB,THEORET BIOL & BIOPHYS GRP,LOS ALAMOS,NM 87545. ETH ZURICH,INST CELL BIOL,CH-8093 ZURICH,SWITZERLAND. FU NIGMS NIH HHS [GM-37812] NR 99 TC 13 Z9 13 U1 0 U2 2 PU ADENINE PRESS INC PI GUILDERLAND PA PO BOX 355/340, GUILDERLAND, NY 12084 SN 0739-1102 J9 J BIOMOL STRUCT DYN JI J. Biomol. Struct. Dyn. PD OCT PY 1994 VL 12 IS 2 BP 301 EP 325 PG 25 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA PW099 UT WOS:A1994PW09900003 PM 7702771 ER PT J AU ARNOLD, GE MANCHESTER, JI TOWNSEND, BD ORNSTEIN, RL AF ARNOLD, GE MANCHESTER, JI TOWNSEND, BD ORNSTEIN, RL TI INVESTIGATION OF DOMAIN MOTIONS IN BACTERIOPHAGE-T4 LYSOZYME SO JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS LA English DT Article ID MOLECULAR-DYNAMICS SIMULATION; EGG-WHITE LYSOZYME; PROTEIN DYNAMICS; BINDING PROTEIN; HIV-1 PROTEASE; CRYSTAL; MUTANT; TEMPERATURE; RELAXATION; MODELS AB Hinge-bending in T4 lysozyme has been inferred from single amino acid mutant crystalline allomorphs by Matthews and coworkers. This raises an important question: are the different conformers in the unit cell artifacts of crystal packing forces, or do they represent different solution state structures? The objective of this theoretical study is to determine whether domain motions and hinge-bending could be simulated in T4 lysozyme using molecular dynamics. An analysis of a 400 ps molecular dynamics simulation of the 164 amino acid enzyme T4 lysozyme is presented. Molecular dynamics calculations were computed using the Discover software package (Biosym Technologies). All hydrogen atoms were modeled explicitly with the inclusion of all 152 crystallographic waters at a temperature of 300 K. The native T4 lysozyme molecular dynamics simulation demonstrated hinge-bending in the protein. Relative domain motions between the N-terminal and C-terminal domains were evident. The enzyme hinge bending sites resulted from small changes in backbone atom conformations over several residues rather than rotation about a single bound. Two hinge loci were found in the simulation. One locus comprises residues 8-14 near the C-terminal of the A helix; the other site, residues 77-83 near the C-terminal of the C helix. Comparison of several snapshot structures from the dynamics trajectory clearly illustrates domain motions between the two lysozyme lobes. Time correlated atomic motions in the protein were analyzed using a dynamical cross-correlation map. We found a high degree of correlated atomic motions in each of the domains and, to a lesser extent, anticorrelated motions between the two domains. We also found that the hairpin loop in the N-terminal lobe (residues 19-24) acted as a mobile 'flap' and exhibited highly correlated dynamic motions across the cleft of the active site, especially with residue 142. C1 PACIFIC NW LAB, ENVIRONM MOLEC SCI LAB, RICHLAND, WA 99352 USA. NR 47 TC 18 Z9 18 U1 0 U2 2 PU ADENINE PRESS INC PI GUILDERLAND PA PO BOX 355/340, GUILDERLAND, NY 12084 SN 0739-1102 J9 J BIOMOL STRUCT DYN JI J. Biomol. Struct. Dyn. PD OCT PY 1994 VL 12 IS 2 BP 457 EP 474 PG 18 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA PW099 UT WOS:A1994PW09900012 PM 7702780 ER PT J AU SZANYI, J ANDERSON, S PAFFETT, MT AF SZANYI, J ANDERSON, S PAFFETT, MT TI N-BUTANE HYDROGENOLYSIS AT SN/PT(111) SURFACE ALLOYS SO JOURNAL OF CATALYSIS LA English DT Article ID SINGLE-CRYSTAL SURFACES; TIN REFORMING CATALYSTS; TEMPERATURE-DEPENDENCE; CONVERSION; METHYLCYCLOPENTANE; CHEMISORPTION; ETHYLENE; EUROPT-1; PT(111); PROPANE AB Ordered bimetallic Sn/Pt(111) surface alloys have been prepared in an ultrahigh vacuum system and used in model moderate pressure (1-200 Torr) batch catalytic reactions. Hydrogenolysis of n-butane (H-2/n-C-4 = 100) was conducted on these surfaces to characterize the effects of ordered bimetallic ensembles relative to those available at the Pt(111) surface over the temperature range 525-625 K. For these conditions, specific n-butane hydrogenolysis reaction rates were determined for the p(2 x 2) Sn/Pt(111) surface alloy, the (root 3 x root 3)R30 degrees Sn/Pt(111) surface alloy, and Pt(111) as a function of temperature. The order of relative activities is p(2 x 2) Sn/Pt(111) surface alloy > Pt(111) > (root 3 x root 3)R30 degrees Sn/Pt(111) surface alloy with specific activation energies of 29 +/- 2 kcal mol(-1) for all three surfaces below 575 K. A leveling in activity is seen for all three surfaces at temperatures above 575 K. The hydrogenolysis activity of the p(2 x 2) Sn/Pt(111) surface alloy is approximately 5-6 times greater than that seen over Pt(111) and the (root 3 x root 3)R30 degrees Sn/Pt(111) surface alloy is approximately an order of magnitude less active. Product distributions and catalytic deactivation were found to be substantially different for these three surfaces. These results are discussed in terms of the ensemble requirement differences inherent to the hydrogenolysis pathways available at each of the base metals under these conditions of temperature, pressure, and hydrogen/hydrocarbon ratio. (C) 1994 Academic Press, Inc. C1 UNIV NEW MEXICO,DEPT CHEM ENGN,ALBUQUERQUE,NM 87131. RP SZANYI, J (reprint author), LOS ALAMOS NATL LAB,DIV CHEM SCI & TECHNOL,LOS ALAMOS,NM 87545, USA. NR 30 TC 17 Z9 17 U1 0 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9517 J9 J CATAL JI J. Catal. PD OCT PY 1994 VL 149 IS 2 BP 438 EP 448 DI 10.1006/jcat.1994.1310 PG 11 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA PK505 UT WOS:A1994PK50500018 ER PT J AU MILLS, R MALHOTRA, R WOOLF, LA MILLER, DG AF MILLS, R MALHOTRA, R WOOLF, LA MILLER, DG TI EXPERIMENTAL DISTINCT DIFFUSION DATA FOR 14 BINARY NONELECTROLYTE MIXTURES SO JOURNAL OF CHEMICAL AND ENGINEERING DATA LA English DT Article ID ACETONITRILE + WATER; METHANOL-WATER; COEFFICIENTS; 278-K; ENTHALPIES; 308.15-K; 298-K AB In a recent publication, Mills et al. (1) calculated distinct diffusion coefficients in 4 frames of reference for 14 binary nonelectrolyte mixtures. Because of space limitations, some of the data were represented graphically in that paper. The distinct diffusion coefficient data for the mass-, volume- and number-fixed frames of reference for all systems are given numerically here. The thermodynamic factor (partial derivative ln a(i)lpartial derivative ln x(i))T,P, which is often used in mass-transport theories, is also given. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP MILLS, R (reprint author), AUSTRALIAN NATL UNIV,PHYS SCI RES SCH,ATOM & MOLEC PHYS LABS,CANBERRA,ACT 0200,AUSTRALIA. NR 23 TC 7 Z9 7 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0021-9568 J9 J CHEM ENG DATA JI J. Chem. Eng. Data PD OCT PY 1994 VL 39 IS 4 BP 929 EP 932 DI 10.1021/je00016a067 PG 4 WC Thermodynamics; Chemistry, Multidisciplinary; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA PL997 UT WOS:A1994PL99700067 ER PT J AU NORMAN, EB AF NORMAN, EB TI STELLAR ALCHEMY - THE ORIGIN OF THE CHEMICAL-ELEMENTS SO JOURNAL OF CHEMICAL EDUCATION LA English DT Article; Proceedings Paper CT Symposium on Pre-College Education in the Nuclear Sciences, at the 204th National Meeting of the American-Chemical-Society CY AUG, 1992 CL WASHINGTON, DC SP AMER CHEM SOC ID NEUTRINO BURST; SN1987A RP NORMAN, EB (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 22 TC 6 Z9 6 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0021-9584 J9 J CHEM EDUC JI J. Chem. Educ. PD OCT PY 1994 VL 71 IS 10 BP 813 EP 820 PG 8 WC Chemistry, Multidisciplinary; Education, Scientific Disciplines SC Chemistry; Education & Educational Research GA PM255 UT WOS:A1994PM25500005 ER PT J AU ROBINSON, L BROWN, DH AF ROBINSON, L BROWN, DH TI RESEARCH AND LEARNING OPPORTUNITIES IN A REACTOR-BASED NUCLEAR ANALYTICAL LABORATORY SO JOURNAL OF CHEMICAL EDUCATION LA English DT Article; Proceedings Paper CT Symposium on Pre-College Education in the Nuclear Sciences, at the 204th National Meeting of the American-Chemical-Society CY AUG, 1992 CL WASHINGTON, DC SP AMER CHEM SOC C1 RED BANK HIGH SCH,CHATTANOOGA,TN 37415. RP ROBINSON, L (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831, USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0021-9584 J9 J CHEM EDUC JI J. Chem. Educ. PD OCT PY 1994 VL 71 IS 10 BP 824 EP 826 PG 3 WC Chemistry, Multidisciplinary; Education, Scientific Disciplines SC Chemistry; Education & Educational Research GA PM255 UT WOS:A1994PM25500007 ER PT J AU HSU, CW NG, CY AF HSU, CW NG, CY TI NONRESONANT 2-PHOTON PULSED-FIELD IONIZATION OF CH3S FORMED IN PHOTODISSOCIATION OF CH3SH AND CH3SSCH3 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ENERGY PHOTOELECTRON-SPECTRUM; LASER-INDUCED FLUORESCENCE; 193 NM PHOTODISSOCIATION; ELECTRONIC GROUND-STATE; ULTRAVIOLET PHOTODISSOCIATION; ROTATIONAL ANALYSIS; METHYL MERCAPTAN; NITRIC-OXIDE; RESOLUTION; PHOTOIONIZATION AB Threshold photoelectron (PE) spectra for CH3S formed in the photodissociation of CH3SH and CH3SSCH3 in the photon energy range of 36 850-38 150 cm(-1) have been measured using the nonresonant two-photon pulsed field ionization (N2P-PFI) technique. Both spin-orbit states CH3S(($) over tilde X (2)E(3/2)) and CH3S((2)E(1/2)) are observed from CH3SH and CH3SSCH3 in this photodissociation energy range. However, negligible intensities of vibrationally excited CH3S radicals are produced from CH3SH. In the case of CH3S from CH3SSCH3, the population ratio CH3S(upsilon(3)=1)/CH3S(upsilon(3)=0) is estimated to be approximate to 0.18. The simulation of the N2P-PFI-PE spectra reveals that the rotational temperature for CH3S(($) over tilde X (2)E(3/2,1/2)) formed by photodissociation of CH3SH is approximate to 200-250 K and the branching ratio CH3S((2)E(1/2))/CH3S(($) over tilde X (2)E(3/2)) is 0.5+/-0.1. For CH3S(($) over tilde X (2)E(3/2,1/2)) produced from CH3SSCH3, the rotational temperature for CH3S(($) over tilde X (2)E(3/2,1/2)) is approximate to 800-900 K and the branching ratio CH3S((2)E(1/2))/CH3S(($) over tilde X (2)E(3/2)) is 1.1+/-0.2. This experiment demonstrates that the PFI-PE spectroscopic method can be a sensitive probe for nascent rovibronic state distributions of photoproducts. Furthermore, the simulation also shows that the photoionization dynamics of CH,S may involve rotational angular momentum changes up to +/-4. The ionization energy and C-S stretching frequency for CH3S+(($) over tilde X (3)A(2)) are determined to be 74 726+/-8 cm(-1) (9.2649+/-0.0010 eV) and 733+/-5 cm(-1), respectively. The spin-orbit splitting for CH3S(($) over tilde X (2)E(3/2,1/2)) is 257+/-5 cm(-1), in agreement with the literature values. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP HSU, CW (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 37 TC 32 Z9 33 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 1 PY 1994 VL 101 IS 7 BP 5596 EP 5603 DI 10.1063/1.467346 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PH987 UT WOS:A1994PH98700018 ER PT J AU TANG, J NORRIS, JR AF TANG, J NORRIS, JR TI ON SUPEREXCHANGE ELECTRON-TRANSFER REACTIONS INVOLVING 3 PARABOLOIDAL POTENTIAL SURFACES IN A 2-DIMENSIONAL REACTION COORDINATE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID PHOTOSYNTHETIC REACTION CENTERS; BACTERIAL PHOTOSYNTHESIS; 3-COMPONENT SYSTEM; POLAR-SOLVENTS; QUANTUM MODES; KINETICS AB A stochastic Liouville theory is presented for the superexchange electron-transfer reactions involving three paraboloidal potential surfaces in a two-dimensional reaction coordinate. Its close relationship with the spin-boson model for photosynthesis is discussed. A triangle representation is used to explain the relationship between the reorganization energy and the degree of correlation for the solvent fluctuations experienced by the donor, the intermediate,: and the acceptor. Explanations for a small reorganization energy for an efficient superexchange mechanism in natural photosynthesis are offered. RP TANG, J (reprint author), ARGONNE NATL LAB,DIV CHEM,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Tang, Jau/D-8382-2012 OI Tang, Jau/0000-0003-2078-1513 NR 25 TC 14 Z9 14 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 OCT 1 PY 1994 VL 101 IS 7 BP 5615 EP 5622 DI 10.1063/1.467348 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PH987 UT WOS:A1994PH98700020 ER PT J AU BROWNING, PW JENSEN, E WASCHEWSKY, GCG TATE, MR BUTLER, LJ HESSLER, JP AF BROWNING, PW JENSEN, E WASCHEWSKY, GCG TATE, MR BUTLER, LJ HESSLER, JP TI PROBING DYNAMICS IN THE FRANCK-CONDON AND EXIT CHANNEL REGIONS OF DISSOCIATING H2S - EMISSION-SPECTRA UPON TUNABLE EXCITATION FROM 199-203 NM SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID 1ST ABSORPTION-BAND; PHOTODISSOCIATION DYNAMICS; TRANSITION-STATE; RESONANCE RAMAN; 193.3 NM; SPECTROSCOPY; MOLECULES; PHOTOFRAGMENTATION; NONADIABATICITY; CONTINUUM AB This study uses emission spectroscopy of H2S at excitation energies near 200 nm to probe the dissociation dynamics from a conical intersection in the Franck-Condon region to the H+SH product exit channel. Photoexcitation accesses these coupled surfaces near the transition state region of the lower adiabat, a potential surface for the excited state H+SH-->HS -->H reaction. Excitation wavelengths from 199-203 nm tune through the first of the resonances in the absorption spectrum assigned to recurrences in the motion along the symmetric stretch orthogonal to the reaction coordinate and also access energies just above and at the conical intersection. We disperse the emission from the dissociating molecules at each of five excitation wavelengths in this region to probe several features of the reaction dynamics on the coupled potential energy surfaces. The resulting emission spectra cover the range of final vibrational eigenstates from 500 to 11 000 cm(-1) above the initial ground vibrational state for all five excitation wavelengths, and go out to 16 500 cm(-1) for the 199 and 201 nm excitation wavelengths. The resulting spectra, when considered in conjunction with recent scattering calculations by Heumann and Schinke on ab initio potential energy surfaces for this system, evidence a progression of emission features to low vibrational eigenstates in the SH stretch that result from coupling of the nuclear motion from the bound to the dissociative region of the potential energy surfaces. This emission, into local mode eigenstates such as 00(+)1, 11(+)0, 11(+)1, 21(+)0, 21(+)1, evidences the antisymmetric dissociative motion and bending induced near the conical intersection, and dominates the spectrum at excitation wavelengths only near 200 nm. We analyze the excitation wavelength dependence of these features and also of the n0(+)0 progression for n greater than or equal to 4, which reflect the exit channel dynamics. The excitation wavelength dependence shows that while the emission spectra do not reveal any dynamics unique to scattering states that access a symmetric stretch resonance in the Franck-Condon region, they do reveal the energy location of and the dynamics at the conical intersection. A reanalysis of other workers' measurements of the SH product vibrational state distribution shows that upsilon=0 products are strongly favored at excitation wavelengths near the conical intersection. C1 UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP BROWNING, PW (reprint author), UNIV CHICAGO,JAMES FRANCK INST,5640 S ELLIS AVE,CHICAGO,IL 60637, USA. NR 35 TC 23 Z9 23 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 1 PY 1994 VL 101 IS 7 BP 5652 EP 5664 DI 10.1063/1.467351 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PH987 UT WOS:A1994PH98700023 ER PT J AU BURNS, AR STECHEL, EB JENNISON, DR LI, YS AF BURNS, AR STECHEL, EB JENNISON, DR LI, YS TI MULTIDIMENSIONAL DYNAMICS IN THE ELECTRON-STIMULATED DESORPTION OF AMMONIA FROM PT(111) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MULTIPHOTON-IONIZATION SPECTROSCOPY; RESOLVED ANGULAR-DISTRIBUTIONS; LASER-INDUCED INTERACTION; NEUTRAL PRODUCTS; DOUBLE-RESONANCE; ENERGY-TRANSFER; NH3; ADSORPTION; SURFACE; STATE AB We characterize the electron stimulated desorption of neutral ammonia (NH3 and ND3) from Pt(111) with vibrational and rotational quantum resolution by using (2+1) resonance enhanced multiphoton ionization detection. Two significant isotope effects appear: (1) the desorption yield of NH3 is three times that of ND3 and (2) NH3 desorbs with considerably more ''spinning'' rotational energy than does ND3. We find virtually identical translational energy distributions for each desorbate and roughly equal vibrational energy distributions. Vibrational excitation is found exclusively in the v(2) symmetric deformation or ''umbrella'' mode, independent of isotope. These effects cannot be explained by desorption induced by vibrational energy transfer. Instead, desorption is the result of excitation of a 3a(1) electron principally on the N atom, which causes the pyramidal NH3 adsorbate to rapidly invert. Ab initio calculations of two-dimensional potential energy surfaces (intramolecular bond angle and surface bond length) reveal that near-inverted molecules deexcite to a repulsive hard wall of the adsorbate-substrate interaction and desorb. Spinning excitation derives from the rotational barrier of the inverted molecule. Both isotope effects are direct consequences of desorption via inversion. in general, multidimensional dynamics must be considered in the study of stimulated surface processes. Our calculations also indicate that excited-state forces at equilibrium molecule-surface distances are an order of magnitude less than those derived from a currently accepted image-potential model. C1 BIOSYM TECHNOL INC,SAN DIEGO,CA 92121. RP BURNS, AR (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. RI Stechel, Ellen/B-1253-2012 NR 64 TC 52 Z9 52 U1 0 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 OCT 1 PY 1994 VL 101 IS 7 BP 6318 EP 6329 DI 10.1063/1.468385 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PH987 UT WOS:A1994PH98700091 ER PT J AU TOMASZKIEWICZ, I SUSMAN, S VOLIN, KJ OHARE, PAG AF TOMASZKIEWICZ, I SUSMAN, S VOLIN, KJ OHARE, PAG TI FLUORINE-COMBUSTION CALORIMETRIC DETERMINATIONS OF THE STANDARD MOLAR ENTHALPY CHANGES FOR THE FORMATION OF SISE2(CR), SISE1.94(CR), AND SISE1.94(VIT), AND FOR THE TRANSITION - SISE1.94(VIT)=SISE1.94(CR) AT THE TEMPERATURE T=298.15-5 - IMPLICATIONS OF THE RESULTS FOR THE ENTHALPIES OF DISSOCIATION D(M)DEGREES(SE-SISE) AND D(M)DEGREES(SISE) - THERMODYNAMIC PROPERTIES OF SISE(G) SO JOURNAL OF CHEMICAL THERMODYNAMICS LA English DT Article ID COMPUTER-GENERATED MODELS; CHALCOGENIDE GLASSES; SIXSE1-X GLASSES; SILICON DISELENIDE; ATOMIC-STRUCTURE; HIGH-RESOLUTION; RANGE ORDER; SELENIUM; CRYSTALLINE; A-SISE2 AB Fluorine-bomb calorimetry was used to determine the standard massic energies of combustion DELTA(c)u degrees of the silicon selenides SiSe2(cr), SiSe1.94(cr), and SiSe1.94(vit), according to the combustion reaction: SiSe(v)(s)+(2+3v)F2(g) = SiF4(g)+vSeF6(g). The following additional results were derived for the standard molar energy of combustion DELTA(c) U(m)degrees; the standard molar enthalpy of combustion DELTA(c)H(m)degrees; and the standard molar enthalpy of formation DELTA(f)H(m)degrees, all at the temperature T = 298.15 K and for the standard pressure p degrees = 101.325 kPa: SiSe2(cr) SiSe1.94(vit) SiSe1.94(cr) DELTA(c)u degrees/(J.g-1) -19682+/-16 -19873+/-13 -19837+/-22 DELTA(c)U(m)degrees/(kJ.mol-1) -3661.05+/-2.98 -3602.38+/-2.36 -3595.85+/-4.35 DELTA(c)H(m)degrees/(kJ.mol-1) -3673.4+/-3.0 -3614.5+/-2.4 -3608.0+/-4.3 DELTA(f)H(m)degrees/(kJ.mol-1) -178.4+/-3.1 -170.2+/-2.4 -176.7+/-4.5 Standard thermodynamic properties of the gas SiSe(g) were calculated by means of the conventional formulae of statistical mechanics. On the basis of the thermochemical quantities given above, the standard molar enthalpy of the transition: SiSe1.94(vit) = SiSe1.94(cr) is DELTA(trs) H(m)degrees = -(6.5 +/- 2.2) kJ.mol-1 at T = 298.15 K. (All uncertainties in this abstract correspond to twice the standard deviation of the mean.) Implications of the thermochemical quantities for the enthalpies of dissociation D(m)degrees(SiSe) and D(m)degrees (Se-SiSe) are discussed, and the latter are compared with D(m)degrees(SiX) and D(m)degrees(X-SiX), where X denotes O, S, or Te. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. POLISH ACAD SCI,INST PHYS CHEM,WARSAW 42,POLAND. NR 58 TC 7 Z9 7 U1 1 U2 1 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0021-9614 J9 J CHEM THERMODYN JI J. Chem. Thermodyn. PD OCT PY 1994 VL 26 IS 10 BP 1081 EP 1093 DI 10.1006/jcht.1994.1126 PG 13 WC Thermodynamics; Chemistry, Physical SC Thermodynamics; Chemistry GA PK537 UT WOS:A1994PK53700007 ER PT J AU PRICE, C RIND, D AF PRICE, C RIND, D TI THE IMPACT OF A 2-X-CO2 CLIMATE ON LIGHTNING-CAUSED FIRES SO JOURNAL OF CLIMATE LA English DT Article ID WILDLAND FIRE; UNITED-STATES; FOREST; VEGETATION; MINNESOTA; MODEL; CLOUD AB Future climate change could have significant repercussions for lightning-caused wildfires. Two empirical fire models are presented relating the frequency of lightning fires and the area burned by these fires to the effective precipitation and the frequency of thunderstorm activity. One model deals with the seasonal variations in lightning fires, while the second model deals with the interannual variations of lightning fires. These fire models are then used with the Goddard Institute for Space Studies General Circulation Model to investigate possible changes in fire frequency and area burned in a 2 x CO2 climate. In the United States, the annual mean number of lightning fires increases by 44%, while the area burned increases by 78%. On a global scale, the largest increase in lightning fires can be expected in untouched tropical ecosystems where few natural fires occur today. C1 COLUMBIA UNIV,NEW YORK,NY. NASA,GODDARD INST SPACE STUDIES,NEW YORK,NY 10025. RP PRICE, C (reprint author), LAWRENCE LIVERMORE NATL LAB,GLOBAL CLIMATE RES DIV,L-262,POB 808,LIVERMORE,CA 94550, USA. NR 44 TC 125 Z9 129 U1 1 U2 16 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8755 J9 J CLIMATE JI J. Clim. PD OCT PY 1994 VL 7 IS 10 BP 1484 EP 1494 DI 10.1175/1520-0442(1994)007<1484:TIOACC>2.0.CO;2 PG 11 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA PN511 UT WOS:A1994PN51100003 ER PT J AU BRAATZ, JA BASS, MB ORNSTEIN, RL AF BRAATZ, JA BASS, MB ORNSTEIN, RL TI AN EVALUATION OF MOLECULAR-MODELS OF THE CYTOCHROME-P450 STREPTOMYCES-GRISEOLUS ENZYMES P450SU1 AND P450SU2 SO JOURNAL OF COMPUTER-AIDED MOLECULAR DESIGN LA English DT Article DE HOMOLOGY MODELING; SEQUENCE ALIGNMENT; 3-DIMENSIONAL STRUCTURE; MOLECULAR MECHANICS ID SITE-DIRECTED MUTAGENESIS; DYNAMICS SIMULATION; SPIN EQUILIBRIUM; SEQUENCE; SPECIFICITY; EVOLUTION; BINDING; MUTANTS; GENES AB P450SU1 and P450SU2 are herbicide-inducible bacterial cytochrome P450 enzymes from Streptomyces griseolus. They have two of the highest sequence identities to camphor hydroxylase (P450cam from Pseudomonas putida), the cytochrome P450 with the first known crystal structure. We have built several models of these two proteins to investigate the variability in the structures that can occur from using different modeling protocols. We looked at variability due to alignment methods, backbone loop conformations and refinement methods. We have constructed two models for each protein using two alignment algorithms, and then an additional model using an identical alignment but different loop conformations for both buried and surface loops. The alignments used to build the models were created using the Needleman-Wunsch method, adapted for multiple sequences, and a manual method that utilized both a dot-matrix search matrix and the Needleman-Wunsch method. After constructing the initial models, several energy minimization methods were used to explore the variability in the final models caused by the choice of minimization techniques. Features of cytochrome P450cam and the cytochrome P450 superfamily, such as the ferredoxin binding site, the heme binding site and the substrate binding site were used to evaluate the validity of the models. Although the final structures were very similar between the models with different alignments, active-site residues were found to be dependent on the conformations of buried loops and early stages of energy minimization. We show which regions of the active site are the most dependent on the particular methods used, and which parts of the structures seem to be independent of the methods. C1 PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 32 TC 14 Z9 14 U1 0 U2 2 PU ESCOM SCI PUBL BV PI LEIDEN PA PO BOX 214, 2300 AE LEIDEN, NETHERLANDS SN 0920-654X J9 J COMPUT AID MOL DES JI J. Comput.-Aided Mol. Des. PD OCT PY 1994 VL 8 IS 5 BP 607 EP 622 DI 10.1007/BF00123668 PG 16 WC Biochemistry & Molecular Biology; Biophysics; Computer Science, Interdisciplinary Applications SC Biochemistry & Molecular Biology; Biophysics; Computer Science GA PP911 UT WOS:A1994PP91100008 PM 7876903 ER PT J AU GOLDBERG, LA AF GOLDBERG, LA TI LISTING GRAPHS THAT SATISFY 1ST-ORDER SENTENCES SO JOURNAL OF COMPUTER AND SYSTEM SCIENCES LA English DT Article ID SETS AB The main result of this paper is a method that turns any almost-sure sentence in the first-order language of graphs into a deterministic polynomial space polynomial delay algorithm for listing the graphs that satisfy the sentence. (Our result is the first such method). Our work builds upon earlier work of Fagin. In particular, Fagin defined an infinite collection of combinatorial axioms and showed that for any fixed integer k almost every graph satisfies the kth axiom in his collection. Suppose that theta is a sentence in the first-order language of graphs. (For example, theta might say ''This graph does not have a triangle,'' or ''Every connected component of this graph is a clique.'') Fagin has shown that for each such theta there is an integer k such that either (1) Every graph that satisfies the kth axiom in his collection satisfies theta (in which case theta is an ''almost-sure'' sentence), or (2) Every graph that satisfies the kth axiom in his collection satisfies inverted left perpendiculartheta (hence inverted left perpendiculartheta is an ''almost-sure'' sentence). If theta is an almost-sure sentence then Raghavan's method of pessimistic estimators can be used to construct an example of an n-vertex graph that satisfies theta (for every large enough integer n). However, the method of pessimistic estimators does not give us enough information to actually list all of the n-vertex graphs that satisfy theta. Prior to this work it was unknown whether or not every almost-sure first-order sentence could be associated with a polynomial delay algorithm for listing the graphs that satisfy the sentence. We show that this is the case and that, in fact, a single method can be used for every almost-sure first-order sentence. Furthermore, polynomial space can be achieved simultaneously with polynomial delay. We describe our method in the context of listing families of graphs that are defined by first-order sentences. However, our method can also be used to obtain polynomial space polynomial delay listing algorithms for certain other families of graphs-for example, the family of connected graphs. More generally our method can be viewed as an extension of the method of pessistic estimators and as a general technique for using probabilistic arguments to produce deterministic polynomial space polynomial delay listing algorithms. We expect the method to be useful for listing a variety of combinatorial structures. (C) 1994 Academic Press, Inc. C1 UNIV EDINBURGH,EDINBURGH EH8 9YL,MIDLOTHIAN,SCOTLAND. RP GOLDBERG, LA (reprint author), SANDIA NATL LABS,DEPT ALGORITHMS & DISCRETE MATH 1423,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 21 TC 3 Z9 3 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-0000 J9 J COMPUT SYST SCI JI J. Comput. Syst. Sci. PD OCT PY 1994 VL 49 IS 2 BP 408 EP 424 DI 10.1016/S0022-0000(05)80057-1 PG 17 WC Computer Science, Hardware & Architecture; Computer Science, Theory & Methods SC Computer Science GA PJ481 UT WOS:A1994PJ48100015 ER PT J AU LEE, JH VERHOEVEN, JD AF LEE, JH VERHOEVEN, JD TI EUTECTIC FORMATION IN THE NI-AL SYSTEM SO JOURNAL OF CRYSTAL GROWTH LA English DT Article AB Directional solidification studies have been carried out on Ni-Al alloys at the eutectic and at off-eutectic compositions. This system has a peritectic reaction at a composition and temperature very close to the eutectic reaction and hence three different solid phases beta, gamma, and gamma', can form from the liquid at near the same temperature. Apparently, as a result of this fact, several very unusual types of coupled eutectic growth structures were found in this system. Both the equilibrium eutectic, beta + gamma' and a metastable eutectic, beta + gamma, form in this system under just slightly different conditions. In addition, at low volume fractions of the beta phase an unusual form of rod eutectic forms. In this structure beta rods are arrayed around the cell boundaries of gamma' cells with a spacing along the cell boundaries that matches the spacing for the normal rod eutectic that occurs as close packed arrays at higher volume fractions of beta. This eutectic is confined to the gamma' cell boundaries and may be called a cell boundary eutectic. A second type of cell boundary eutectic was observed which is a metastable beta + gamma eutectic. Here the eutectic is made up of alternating blades of the beta and gamma phases along the cell boundaries of gamma' cells. The spacing versus solidification rate of the various eutectic structures are measured and analyzed with reference to the Jackson-Hunt theory of coupled eutectic growth. C1 IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. US DOE,AMES LAB,AMES,IA 50011. NR 11 TC 31 Z9 32 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD OCT PY 1994 VL 143 IS 1-2 BP 86 EP 102 DI 10.1016/0022-0248(94)90371-9 PG 17 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA PJ946 UT WOS:A1994PJ94600012 ER PT J AU CHENG, W FINNIE, I GREMAUD, M ROSSELET, A STREIT, RD AF CHENG, W FINNIE, I GREMAUD, M ROSSELET, A STREIT, RD TI THE COMPLIANCE METHOD FOR MEASUREMENT OF NEAR-SURFACE RESIDUAL-STRESSES - APPLICATION AND VALIDATION FOR SURFACE-TREATMENT BY LASER AND SHOT-PEENING SO JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article AB Residual stresses due to surface treatment are measured using the compliance method. The method makes use of the strains measured on the surface while a cut is extended progressively along a plane of interest. The experimental results for a shot peened specimen show good agreement with those obtained by the X-ray method. This experiment demonstrates that the compliance method is accurate and capable of measuring residual stresses which vary rapidly over a depth of less than 50 mu m Good general agreement with results by the X-ray method is also obtained for a laser created specimen. Some advantages and disadvantages of the present method relative to hole-drilling, layer removal and X-ray methods are discussed. C1 ECOLE POLYTECH FED LAUSANNE,DEPT MAT,CH-1015 LAUSANNE,SWITZERLAND. SULZER INNOTEC,MECH TECHNOL,CH-8401 WINTERTHUR,SWITZERLAND. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP CHENG, W (reprint author), UNIV CALIF BERKELEY,DEPT MECH ENGN,BERKELEY,CA 94720, USA. NR 9 TC 20 Z9 20 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0094-4289 J9 J ENG MATER-T ASME JI J. Eng. Mater. Technol.-Trans. ASME PD OCT PY 1994 VL 116 IS 4 BP 556 EP 560 DI 10.1115/1.2904328 PG 5 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA PN488 UT WOS:A1994PN48800019 ER PT J AU BOGEN, KT AF BOGEN, KT TI MODELS BASED ON STEADY-STATE IN-VITRO DERMAL PERMEABILITY DATA UNDERESTIMATE SHORT-TERM IN-VIVO EXPOSURES TO ORGANIC-CHEMICALS IN WATER SO JOURNAL OF EXPOSURE ANALYSIS AND ENVIRONMENTAL EPIDEMIOLOGY LA English DT Article DE AQUEOUS; NON-STEADY-STATE; PERCUTANEOUS; SKIN; UPTAKE; SOLVENTS; COMPARISON AB Currently, dermal exposure to organic chemicals in aqueous solution is typically assessed using models based an in vitro steady-state permeability (K-p) values, of the type measured using diffusion cells. Relatively few measures of ''effective'' permeability (K-p(eff), defined for a given total uptake, exposed surface area and exposure time) for organic chemicals in water have been obtained from in vivo dermal exposure data. K-p(eff) values for nine organic chemicals in. aqueous solution, based on in vivo studies largely involving human subjects, were compared with three corresponding sets of estimates: (1) in vitro steady-state K-p estimates obtained using the ''Potts-Guy'' model involving molecular weight (MW x mol/g, unitless) and octanol/water partition coefficient (K-ow, unitless) values; (2) K-p(eff) estimates greater than the latter K-p estimates by a factor specified in the recent ''EPA-Cleek-Bunge'' model for non-steady-state dermal uptake; and (3) a new model, log(10) K-p(eff) = -0.812 - 0.0104MW + 0.616log(10)K(ow), that was fit directly to the in vivo K-p(eff) estimates for nine chemicals considered (R(2) = 0.98, p = 3x10(-6)). All nine of the in vivo K-p(eff) estimates are underpredicted by the corresponding in vitro-based estimates examined. The underprediction was by an average factor of 20 (+/- 6) using K-p estimates from the Potts-Guy model, and 5 (+/-2) using K-p(eff) estimates based an the EPA-Cleek-Bunge model. In particular, the latter underprediction was found to be systematic, substantial, and highly significant (p = 3x10(-6)). Until more K-p(eff) data are obtained allowing improved models, it is recommended that either the new model obtained here be used to estimate K-p(eff) for organic chemicals in water, or that those based on the EPA-Cleek-Bunge model be increased (e.g., 5-fold). Implications for household dermal exposure assessments involving routine showers are discussed. RP BOGEN, KT (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV HLTH & ECOL ASSESSMENT,L-453,7000 E AVE,LIVERMORE,CA 94550, USA. NR 0 TC 10 Z9 10 U1 0 U2 1 PU PRINCETON SCIENTIFIC PUBL INC PI PRINCETON PA PO BOX 2155, PRINCETON, NJ 08543 SN 1053-4245 J9 J EXPO ANAL ENV EPID JI J. Expo. Anal. Environ. Epidemiol. PD OCT-DEC PY 1994 VL 4 IS 4 BP 457 EP 475 PG 19 WC Environmental Sciences; Public, Environmental & Occupational Health; Toxicology SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Toxicology GA QE884 UT WOS:A1994QE88400004 ER PT J AU GORDON, PL ODELL, C WATKIN, JG AF GORDON, PL ODELL, C WATKIN, JG TI INVESTIGATION OF RED OIL DECOMPOSITION BY SIMULATED HANFORD TANK WASTES SO JOURNAL OF HAZARDOUS MATERIALS LA English DT Article ID NITRATE ESTERS; ALKYL NITRITES; HYDROLYSIS; SALTS AB Samples of 'red oil' have been placed in contact with simulated Hanford tank wastes, and Differential Scanning Calorimetry used to compare energetic content both before and after exposure to these waste simulants. Of the 85 samples studied, 44 samples had their energy content reduced by 90% or more following contact with waste simulant, while 77 of the 85 samples showed at least a 50% fall in energy content. All 85 samples showed at least some reduction in energetic content. The duration of contact between red oil and waste simulant was generally a few hours or days, and the overwhelming majority of the data suggest that contact times of several years, as would be typical in Hanford waste tanks, would further reduce the energy content of red oil to negligible quantities. C1 LOS ALAMOS NATL LAB,INORGAN STRUCT & APPL CHEM GRP CST-3,LOS ALAMOS,NM 87544. US DOE,WASHINGTON,DC 20585. NR 55 TC 4 Z9 5 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3894 J9 J HAZARD MATER JI J. Hazard. Mater. PD OCT PY 1994 VL 39 IS 1 BP 69 EP 86 DI 10.1016/0304-3894(94)00060-3 PG 18 WC Engineering, Environmental; Engineering, Civil; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA PK557 UT WOS:A1994PK55700005 ER PT J AU GORDON, PL ODELL, C WATKIN, JG AF GORDON, PL ODELL, C WATKIN, JG TI SYNTHESIS AND ENERGETIC CONTENT OF RED OIL SO JOURNAL OF HAZARDOUS MATERIALS LA English DT Article AB 'Red oil' materials, resembling those produced during destructive incidents at Hanford and Savannah River, have been prepared following prolonged heating of uranyl nitrate, nitric acid, tributylphosphate (TBP) and a hydrocarbon diluent either under reflux conditions or within a high-pressure bomb reactor. Phase inversions, a characteristic feature of 'red oil' formation, were observed only when a cyclic hydrocarbon diluent was employed and were not observed when a straight chain hydrocarbon was used. The energetic content of the 'red oil' materials was found to be in the range from 30 to 444 J g-1 (7.2-106.1 cal g-1) as determined by DSC in open pans in the temperature range 20-350-degrees-C, with a typical value being 200 J g-1 (47.8 cal g-1). A 'baseline' Purex solution of UO2 (NO3)2(TBP)2 released 120 J g-1 (28.7 cal g-1) upon heating through the same temperature range. C1 LOS ALAMOS NATL LAB,INORGAN STRUCT & APPL CHEM GRP CST-3,LOS ALAMOS,NM 87544. US DOE,WASHINGTON,DC 20585. NR 68 TC 11 Z9 12 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3894 J9 J HAZARD MATER JI J. Hazard. Mater. PD OCT PY 1994 VL 39 IS 1 BP 87 EP 105 DI 10.1016/0304-3894(94)00061-1 PG 19 WC Engineering, Environmental; Engineering, Civil; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA PK557 UT WOS:A1994PK55700006 ER PT J AU MATHIS, CA ENAS, JD HANRAHAN, SM AKGUN, E AF MATHIS, CA ENAS, JD HANRAHAN, SM AKGUN, E TI SYNTHESIS OF I-123 AND I-125 LABELED 5-IODO-6-NITROQUIPAZINE SO JOURNAL OF LABELLED COMPOUNDS & RADIOPHARMACEUTICALS LA English DT Article DE [I-123] 5-IODO-6-NITROQUIPAZINE; [I-125] 5-IODO-6-NITROQUIPAZINE; 5-IODO-6-NITROQUIPAZINE; 5-IODO-6-NITRO-2-PIPERAZINYLQUINOLINE; SEROTONIN REUPTAKE COMPLEX ID 5-HYDROXYTRYPTAMINE UPTAKE COMPLEX; EMISSION COMPUTED-TOMOGRAPHY; SEROTONIN UPTAKE SITES; H-3 6-NITROQUIPAZINE; SELECTIVE LIGAND; REUPTAKE SITES; IN-VIVO; BRAIN; RADIOTRACER; DERIVATIVES AB The syntheses of the potent and selective serotonin reuptake complex radioligands [I-123]- and [I-125]5-iodo-6-nitroquipazine (5-iodo-6-nitro-2-piperazinylquinoline) are reported. A seven step synthetic sequence provided the BOC-protected 5-tributyltin-6-nitroquipazine precursor for radioiodination. End of synthesis radioiodination yields of similar to 40% for I-123 and similar to 60% for I-125 were achieved resulting in labelled products with high specific activities (>4000 and >2000 Ci/mmol, respectively) and radiochemical purities (>98%). C1 UNIV PITTSBURGH,DEPT RADIOL,PITTSBURGH,PA 15213. UNIV PITTSBURGH,DEPT PHARMACEUT SCI,PITTSBURGH,PA 15213. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR FUNCT IMAGING,BERKELEY,CA 94720. RI Mathis, Chester/A-8607-2009 NR 22 TC 15 Z9 15 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0362-4803 J9 J LABELLED COMPD RAD JI J. Label. Compd. Radiopharm. PD OCT PY 1994 VL 34 IS 10 BP 905 EP 913 DI 10.1002/jlcr.2580341003 PG 9 WC Biochemical Research Methods; Chemistry, Medicinal; Chemistry, Analytical SC Biochemistry & Molecular Biology; Pharmacology & Pharmacy; Chemistry GA PK927 UT WOS:A1994PK92700002 ER PT J AU DING, YS SUGANO, Y FOWLER, JS SALATA, C AF DING, YS SUGANO, Y FOWLER, JS SALATA, C TI SYNTHESIS OF THE RACEMATE AND INDIVIDUAL ENANTIOMERS OF [C-11] METHYLPHENIDATE FOR STUDYING PRESYNAPTIC DOPAMINERGIC NEURON WITH POSITRON EMISSION TOMOGRAPHY SO JOURNAL OF LABELLED COMPOUNDS & RADIOPHARMACEUTICALS LA English DT Article DE METHYLPHENIDATE; RITALIN; C-11; POSITRON EMISSION TOMOGRAPHY (PET); DOPAMINE UPTAKE SITE ID PARKINSONS-DISEASE; COCAINE RECEPTORS; C-11 WIN-35,428; REUPTAKE SITES; BINDING-SITES; METHYLPHENIDATE; INVIVO; BRAIN; TRANSPORTERS; RADIOTRACER AB Carbon-11 labeled dl-threo-methylphenidate (methyl-2-phenyl-2-(2-piperidyl)acetate, Ritalin), a psychostimulant drug widely used to treat attention deficit hyperactivity disorder, was prepared in two steps: O-methylation of the N-protected dl-threo-ritalinic acid derivative with [C-11]methyl iodide followed by deprotection. The same strategy was applied for the preparation of C-11 labeled individual enantiomers of threo-methylphenidate from N-protected d-threo- or l-threo-ritalinic acid. The subsequent C18 sep-pak and reverse-phase HPLC purification resulted in ca. 40% radiochemical yield with a total synthesis time of 40 minutes and an average specific activity of 1.5 Ci/mu mole (at EOB). RP DING, YS (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 39 TC 26 Z9 28 U1 3 U2 5 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0362-4803 J9 J LABELLED COMPD RAD JI J. Label. Compd. Radiopharm. PD OCT PY 1994 VL 34 IS 10 BP 989 EP 997 DI 10.1002/jlcr.2580341012 PG 9 WC Biochemical Research Methods; Chemistry, Medicinal; Chemistry, Analytical SC Biochemistry & Molecular Biology; Pharmacology & Pharmacy; Chemistry GA PK927 UT WOS:A1994PK92700011 ER PT J AU WEISS, JD AF WEISS, JD TI IMPURITY-DOPED FIBEROPTIC SHOCK POSITION SENSOR SO JOURNAL OF LIGHTWAVE TECHNOLOGY LA English DT Article ID FABRICATION AB We have demonstrated the operation of a fiber-optic device originally proposed to continuously measure the location of a shock front, but which also has potential for use as a crack location sensor. It consists of one or a group of fibers uniformly doped along their length with neodymium, which fluoresces at about 1060 nm in response to being optically pumped at a shorter wavelength. In our case, the pump source was a laser diode emitting at 810 nm. As the length of the fiber is reduced, the strength of the fluorescence signal diminishes along with the number of fluorescing atoms. Laboratory and explosives experiments were performed on sensor fibers containing various concentrations of dopants. We also investigated the benefits, in an explosives application, of adding phosphorus to narrow the fluorescence line. RP WEISS, JD (reprint author), SANDIA NATL LABS,DEPT OPTOELECTR CHARACTERIZAT & SENSOR DEV,ALBUQUERQUE,NM 87185, USA. NR 8 TC 4 Z9 4 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 0733-8724 J9 J LIGHTWAVE TECHNOL JI J. Lightwave Technol. PD OCT PY 1994 VL 12 IS 10 BP 1891 EP 1896 DI 10.1109/50.337504 PG 6 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA PP529 UT WOS:A1994PP52900024 ER PT J AU MOORE, JM BLUMLER, P SHERWOOD, MH WADE, CG COLLINS, GW MAPOLES, ER AF MOORE, JM BLUMLER, P SHERWOOD, MH WADE, CG COLLINS, GW MAPOLES, ER TI NMR IMAGING OF HYDROGEN ISOTOPES BELOW 20-K SO JOURNAL OF MAGNETIC RESONANCE SERIES A LA English DT Note ID NUCLEAR LONGITUDINAL RELAXATION; FUSION TARGET; FUEL C1 IBM CORP,ALMADEN RES CTR,DIV RES,SAN JOSE,CA 95120. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 23 TC 2 Z9 2 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 1064-1858 J9 J MAGN RESON SER A JI J. Magn. Reson. Ser. A PD OCT PY 1994 VL 110 IS 2 BP 248 EP 251 DI 10.1006/jmra.1994.1212 PG 4 WC Physics, Atomic, Molecular & Chemical SC Physics GA PL360 UT WOS:A1994PL36000016 ER PT J AU MISHRA, B OLSON, DL DAVID, SA AF MISHRA, B OLSON, DL DAVID, SA TI POSTWELD ELECTROTRANSPORT TREATMENT SO JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE LA English DT Article DE ELECTROTRANSPORT; HYDROGEN DIFFUSION; STEELS; WELDING ID HYDROGEN; CRACKING; METALS; STEEL AB Hydrogen damage susceptibility of high-strength steel weldments and in other advanced materials, such as intermetallics, is a problem that restricts their application in many structural uses. A high-temperature (similar to 500 degrees C) postweld treatment is often applied to remove the diffusible hydrogen and make the material more resistant to hydrogen damage. An electrotransport technique, using a direct current, can be applied at room temperature to move hydrogen from the underbead region, which is crack susceptible. The method has been used to electrorefine many metals and alloys containing both interstitial and substitutional solutes. This paper reviews the electrotransport theory and applies it to estimate the time of electrotransport treatment for lowering the hydrogen content from the underbead region by 50%. Thus, this theoretical work forms the basis for developing a new practice and provides sample calculations. Under a combined influence of the diffusional and electrotransport at room temperature using an electric field of 0.10 V/cm, similar to 30 min is required to remove 50% of the hydrogen from a starting concentration of 5 ppm. Theoretically, the treatment will also generate a heat of 0.95 kcal/s, which may not cause an excessive temperature increase in the workpiece. The electrotransport technique thus has the potential for a low cost, low-temperature practice for mitigating hydrogen damage susceptibility. C1 OAK RIDGE NATL LAB,WELDING & BRAZING GRP,OAK RIDGE,TN 37831. RP MISHRA, B (reprint author), COLORADO SCH MINES,CTR WELDING & JOINING RES,GOLDEN,CO 80401, USA. NR 28 TC 2 Z9 2 U1 1 U2 2 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 1059-9495 J9 J MATER ENG PERFORM JI J. Mater. Eng. Perform. PD OCT PY 1994 VL 3 IS 5 BP 612 EP 618 DI 10.1007/BF02645259 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA QE403 UT WOS:A1994QE40300006 ER PT J AU LAMBRAKOS, SG METZBOWER, EA MILEWSKI, J LEWIS, G DIXON, R KORZEKWA, D AF LAMBRAKOS, SG METZBOWER, EA MILEWSKI, J LEWIS, G DIXON, R KORZEKWA, D TI SIMULATION OF DEEP PENETRATION WELDING OF STAINLESS-STEEL USING GEOMETRIC CONSTRAINTS BASED ON EXPERIMENTAL INFORMATION SO JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE LA English DT Article DE DEEP PENETRATION; NUMERICAL MODELING; GEOMETRIC CONSTRAINTS AB Results of a numerical simulation of deep penetration welding of 304 stainless steel are presented. This numerical model calculates the temperature and fluid velocity fields in a three-dimensional workpiece undergoing deep-penetration electron beam melding. The deposition of power from the beam and energy outflow at the model-system boundaries is effected by means of time-dependent boundary conditions on the equations of energy and momentum transfer. The vapor-liquid interface defining the keyhole is represented by a surface whose temperature is that of vaporization for the steel. On this surface, are specified boundary conditions for the momentum transfer equations such that the component of the velocity normal to the keyhole vapor-liquid interface is zero. In addition, this study introduces two nem numerical procedures. These procedures are based on the inclusion of experimental information concerning beam spot size and weld pool geometry into the model system via constraints and the deduction of effective keyhole shape via an inverse mapping scheme. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP LAMBRAKOS, SG (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,CODE 6324,WASHINGTON,DC 20375, USA. NR 6 TC 11 Z9 11 U1 0 U2 2 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 1059-9495 J9 J MATER ENG PERFORM JI J. Mater. Eng. Perform. PD OCT PY 1994 VL 3 IS 5 BP 639 EP 648 DI 10.1007/BF02645262 PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA QE403 UT WOS:A1994QE40300009 ER PT J AU ASELAGE, TL VENTURINI, EL VOIGT, JA LAMPPA, DL VANDEUSEN, SB AF ASELAGE, TL VENTURINI, EL VOIGT, JA LAMPPA, DL VANDEUSEN, SB TI 2-ZONE ANNEALING OF TL0.5PB0.5(SR0.8BA0.2)(2)CA2CU3OY SO JOURNAL OF MATERIALS RESEARCH LA English DT Note ID SUPERCONDUCTORS; PHASE; FILMS AB Stable conditions have been identified for two-zone processing of the superconducting thallium cuprate Tl0.5Pb0.5(Sr0.8Ba0.2)(2)Ca2Cu3Oy. With P(O-2) of 0.8 atm, P(Tl2O) of 4.4 X 10(-3) atm, and a sample temperature of 920 degrees C, single-phase Tl0.5Pb0.5(Sr0.8Ba0.2)(2)Ca2Cu3Oy is produced with a T-c of 115 K, complete diamagnetic shielding, and Meissner fraction greater than 70%. Although a small amount of melting occurs under these conditions, a comparison of the low-field diamagnetic shielding for these samples with samples of Pb- and Sr-free TlBa2Ca2Cu3Oy and Tl2Ba2Ca2Cu3Oy suggests that such melting is not necessary to produce the triple-CuO2-layer superconductors. RP ASELAGE, TL (reprint author), SANDIA NATL LABS,DEPT 1153 MS 0345,ALBUQUERQUE,NM 87185, USA. NR 14 TC 5 Z9 5 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 OCT PY 1994 VL 9 IS 10 BP 2470 EP 2473 DI 10.1557/JMR.1994.2470 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA PJ107 UT WOS:A1994PJ10700002 ER PT J AU COPPA, NV HULTS, WL SMITH, JL BRYNESTAD, J AF COPPA, NV HULTS, WL SMITH, JL BRYNESTAD, J TI SYNTHESIS, PROCESSING BEHAVIOR, AND CHARACTERIZATION OF BISMUTH SUPERCONDUCTORS USING FREEZE-DRIED NITRATE PRECURSORS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID PHASE AB The synthesis of Bi2-xPbxSr2Ca2CU3O10 (Bi2223) powders from a freeze dried nitrate precursor is reported here. We examine the composition and morphology of the precursor material, describe the chemistry and kinetics of product formation, and evaluate the phase composition and superconducting properties of the products. A nitrate solution containing the appropriate ratio of cations was rapidly frozen and then freeze dried at low temperatures to form an atomic mixture of the component salts. The thermal processing of the freeze dried material consisted of three steps: (i) dehydration, (ii) denitration, and (iii) solid state reaction to form the Bi2223 superconducting product. Calcium-substituted bismuthates and strontium-substituted calcium cuprate, not Bi2201, are the intermediates between the nitrates and the superconducting products. These highly disordered phases rapidly transform into Bi2212 or Bi2223 at higher temperatures (>790 degrees C). The kinetics of product formation was studied using XRD analysis and magnetic susceptibility. The kinetics were shown to follow the nucleation and growth mechanism. Bi2223 formed after only 30 min at a few degrees below the melting point, and after 37 h Bi2223 products exhibited excellent phase composition and magnetic susceptibility characteristics. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP COPPA, NV (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 19 TC 15 Z9 15 U1 1 U2 6 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD OCT PY 1994 VL 9 IS 10 BP 2510 EP 2518 DI 10.1557/JMR.1994.2510 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA PJ107 UT WOS:A1994PJ10700010 ER PT J AU JIA, QX CHANG, LH ANDERSON, WA AF JIA, QX CHANG, LH ANDERSON, WA TI SURFACE AND INTERFACE PROPERTIES OF FERROELECTRIC BATIO3 THIN-FILMS ON SI USING RUO2 AS AN ELECTRODE SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID BARRIER LAYERS; HETEROSTRUCTURES; FABRICATION; CAPACITORS; FATIGUE AB Ferroelectric BaTiO3 thin films were deposited on Si by rf magnetron sputtering. A conductive oxide, RuO2, was used as the bottom electrode of the capacitors. The performance of the thin film capacitors was found to be a strong function of the surface and interface properties between ferroelectric BaTiO3 and the bottom electrode. A suitable capacitor configuration must be used to preserve the bottom electrode, to enhance the dielectric constant, and to reduce the leakage current density of the films. BaTiO3 thin film on the RuO2/Si substrate, where the BaTiO3 thin film has a bilayer structure of polycrystalline on microcrystalline, showed a dielectric constant of 125 at a frequency of 1 MHz, leakage current density of 10(-6) A/cm(2) at a field intensity of 2.5 X 10(5) V/cm, and a breakdown voltage above 10(6) V/cm. C1 SUNY BUFFALO,DEPT ELECT & COMP ENGN,BUFFALO,NY 14260. RP JIA, QX (reprint author), LOS ALAMOS NATL LAB,CTR SUPERCOND TECHNOL,POB 1663,LOS ALAMOS,NM 87545, USA. RI Jia, Q. X./C-5194-2008 NR 17 TC 33 Z9 33 U1 1 U2 4 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD OCT PY 1994 VL 9 IS 10 BP 2561 EP 2565 DI 10.1557/JMR.1994.2561 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA PJ107 UT WOS:A1994PJ10700016 ER PT J AU HSUEH, CH AF HSUEH, CH TI PULL-OUT OF A DUCTILE FIBER FROM A BRITTLE-MATRIX .2. A SIMPLIFIED MODEL SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID FIBER-REINFORCED COMPOSITES; CRACKING; STRESSES AB The pull-out of a ductile fibre from a brittle matrix was analysed in Part I [1] using a shear-lag model. However, the analysis is formidable due to the consideration of Poisson's effect along the sliding length, This consideration is essential when the debonded fibre-matrix interface is subjected to Coulomb friction during fibre pull-out. To simplify the analysis, Poisson's effect is treated in an average sense in the present study, whereas it was treated pointwise in Part I. The present simplified solutions are in excellent agreement with the previous more rigorous and more complex solutions. The simplified model thus provides adequate solutions for the pull-out of a ductile fibre from a brittle matrix, and can be readily used for further applications. RP HSUEH, CH (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. RI Hsueh, Chun-Hway/G-1345-2011 NR 11 TC 3 Z9 3 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD OCT 1 PY 1994 VL 29 IS 19 BP 5135 EP 5140 DI 10.1007/BF01151108 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA PL024 UT WOS:A1994PL02400027 ER PT J AU SUGAMA, T WETZEL, E AF SUGAMA, T WETZEL, E TI MICROSPHERE-FILLED LIGHTWEIGHT CALCIUM-PHOSPHATE CEMENTS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID ALUMINATE CEMENTS; ALKALI CARBONATION AB The incorporation of inorganic and organic microsphere fillers into calcium phosphate cement (CPC) to produce lightweight cementitious materials that could be used under hydrothermal conditions at high temperatures between 200 and 1000 degrees C was investigated. An aluminosilicate based hollow microsphere, with a density of 0.67 g cm(-3) and a particle size of 75-200 mu m, was the most suitable having a low slurry density of approximate to 1.3 g cm(-3), and a compressive strength greater than 6.89 MPa. This microsphere-filled lightweight CPC exhibited the following characteristics: 1, after autoclaving at 200 degrees C, amorphous ammonium calcium orthophosphate (AmCOP) salt and Al2O3.xH(2)O gel phases, formed by the reaction between calcium aluminate cement and an NH4H2PO4 based fertilizer, were primarily responsible for the development of strength; 2. at a hydrothermal temperature of 300 degrees C, the microsphere shell moderately reacted with the CPC to form an intermediate reaction product, epistilbite (EP), while crystalline hydroxyapatite (HOAp) and boehmite (BO) were yielded by the phase transformations of AmCOP and Al2O3.xH(2)O, respectively; 3, at an annealing temperature of 600 degrees C, the HOAp phase remained in the cement body, even though an EP -->anorthite (AN) phase transition occurred; 4, at 1000 degrees C, the phase conversion of HOAp into whitlockite was completed, while the AN phase was eliminated; and 5. the microsphere demonstrated excellent thermal stability up to temperatures of 1000 degrees C. C1 UNIV DELAWARE,DEPT MECH ENGN,NEWARK,DE 19716. RP SUGAMA, T (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV ENERGY EFFICIENCY & CONSERVAT,UPTON,NY 11973, USA. NR 8 TC 7 Z9 7 U1 2 U2 4 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD OCT 1 PY 1994 VL 29 IS 19 BP 5165 EP 5176 DI 10.1007/BF01151112 PG 12 WC Materials Science, Multidisciplinary SC Materials Science GA PL024 UT WOS:A1994PL02400031 ER PT J AU IRDI, GA BOOHER, HB AF IRDI, GA BOOHER, HB TI LIGHT-MICROSCOPIC EVALUATION OF PYRITE OXIDATION OF HEAP LEACHED SAMPLES FROM A PITTSBURGH SEAM COAL SO JOURNAL OF MICROSCOPY-OXFORD LA English DT Article DE PYRITE; HEAP LEACHING; COAL PETROGRAPHY AB The U.S. Department of Energy and the U.S. Bureau of Mines conducted experiments to determine the feasibility of reducing the pyritic sulphur content of a conventionally cleaned Pittsburgh seam coal by heap leaching. Two identical heaps, one indoor and one outdoor, were constructed, and sprayed with recycled rainwater/leachate for approximately 200 days. Lump samples were selected prior to initiation of heap leaching activities and from both heaps after 5- and 11-month intervals for microscopic (petrographic) examination. These examinations revealed no significant differences in the occurrence of pyrite oxidation between the two heaps. These observations were consistent with the results from the chemical analyses that showed no significant differences in pyritic sulphur removal between the indoor and outdoor heaps. Samples from the starting coal were also selected and examined to see how different pyrite morphologies behaved during artificial weathering. Dendritic and framboidal pyrite forms appeared to be the more reactive forms. RP IRDI, GA (reprint author), US DOE,PITTSBURGH ENERGY TECHNOL CTR,POB 10940,PITTSBURGH,PA 15236, USA. NR 12 TC 1 Z9 1 U1 1 U2 1 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0022-2720 J9 J MICROSC-OXFORD JI J. Microsc.-Oxf. PD OCT PY 1994 VL 176 BP 34 EP 44 PN 1 PG 11 WC Microscopy SC Microscopy GA PR983 UT WOS:A1994PR98300005 ER PT J AU STOBBS, SH MEDLIN, DL MILLS, MJ STOBBS, WM AF STOBBS, SH MEDLIN, DL MILLS, MJ STOBBS, WM TI A COMPARISON OF THE ANALYSIS OF THE FRESNEL CONTRAST IN HIGH-RESOLUTION AND LOW-RESOLUTION IMAGES FOR THE CHARACTERIZATION OF THE RIGID-BODY DISPLACEMENTS AT A GRAIN-BOUNDARY SO JOURNAL OF MICROSCOPY-OXFORD LA English DT Article DE FRESNEL; INTERFACES; RIGID BODY; DISPLACEMENT; SIGMA-3(112)TWIN ID METALS AB The Fresnel contrast in high-resolution images of the Sigma = 3{112} aluminium twin boundary is quantitatively assessed to determine whether the rigid body displacements might be measured. It is demonstrated that the effects of the shears at the boundary preclude this possibility. By comparison, simulations of low-resolution images of the same boundary show that the Fresnel fringe contrast in this type of image is negligibly affected by the shear displacements as well as being of considerably higher contrast. The reasons why it is thus only the low-resolution images that can provide high-resolution data on the displacements are discussed. C1 SANDIA NATL LABS,LIVERMORE,CA 94551. DEPT MAT SCI & MET,CAMBRIDGE CB2 3QZ,ENGLAND. RP STOBBS, SH (reprint author), UNIV CAMBRIDGE NEWNHAM COLL,CAMBRIDGE CB3 9DF,ENGLAND. NR 12 TC 2 Z9 2 U1 0 U2 1 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0022-2720 J9 J MICROSC-OXFORD JI J. Microsc.-Oxf. PD OCT PY 1994 VL 176 BP 45 EP 53 PN 1 PG 9 WC Microscopy SC Microscopy GA PR983 UT WOS:A1994PR98300006 ER PT J AU CAO, WQ HUNT, AJ AF CAO, WQ HUNT, AJ TI IMPROVING THE VISIBLE TRANSPARENCY OF SILICA AEROGELS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID SOL AB Silica alcogels have been prepared in two steps, first in an acid and then in a base to control the relative rates of hydrolysis and condensation of TEOS. Increasing the H2O/TEOS ratio in the base-catalyzed step was the most important factor in reducing Light scattering of the alcogel. The two-step gel could be practically made with H2O/TEOS = 30, achieving a scattering intensity less than 1/5 that of the best one-step gel. Lower scattering of the gel results in an aerogel with improved visible transparency and more homogeneous microstructure. TEM observation reveals that the two-step aerogel has a microstructure containing both linear polymers and colloidal particles that are cross-linked to a gel network. RP CAO, WQ (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720, USA. NR 19 TC 18 Z9 19 U1 1 U2 12 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 OCT PY 1994 VL 176 IS 1 BP 18 EP 25 PG 8 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PP429 UT WOS:A1994PP42900003 ER PT J AU BROW, RK AF BROW, RK TI ELECTRON-BEAM REDUCTION OF SODIUM-CONTAINING GLASS SURFACES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID AUGER AB Soda-silicate and soda-lime silicate glass surfaces were irradiated by a 3 keV, 0.50 mA/cm(2) electron beam and then characterized by X-ray photoelectron spectroscopy. Sodium is depleted from the bombarded surfaces and the non-bridging-to-bridging oxygen ratios also decrease, in agreement with previous studies. Metallic sodium forms on the surfaces of irradiated binary glasses, whereas no reduced sodium can be detected on electron bombarded CaO-containing glass surfaces. RP BROW, RK (reprint author), SANDIA NATL LABS,DIV 1845,MS 0607,ALBUQUERQUE,NM 87185, USA. NR 18 TC 14 Z9 14 U1 4 U2 5 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 OCT PY 1994 VL 175 IS 2-3 BP 155 EP 159 DI 10.1016/0022-3093(94)90007-8 PG 5 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PN498 UT WOS:A1994PN49800006 ER PT J AU SILLS, JA MARTIN, SW TORGESON, DR AF SILLS, JA MARTIN, SW TORGESON, DR TI B-11 NMR-STUDIES OF THE SHORT-RANGE ORDER IN K2S+B2S3 GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; GLASS STRUCTURE; MAS-NMR AB The B-11 NMR spectra of xK(2)S + (1-x)B2S3 glasses with 0 less than or equal to x less than or equal to 0.45 are reported. As in the Na2S + B2S3 and alkali berate, M(2)O + B2O3, systems, the fractions of tetrahedral borons in the low alkali composition range are found to increase with increasing amounts of alkali sulfide. Unlike the Na2S + B2S3 glasses, however, which have a conversion rate of six to eight tetrahedral borons formed per added sulfide anion, the K2S + B2S3 glasses have a conversion rate of three tetrahedral borons formed per added sulfide anion. The alkali berate glasses are well known to have conversion rates of about two tetrahedral borons formed per added oxide anion. A structural model has been developed consistent with these properties. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 26 TC 12 Z9 12 U1 2 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD OCT PY 1994 VL 175 IS 2-3 BP 270 EP 277 DI 10.1016/0022-3093(94)90020-5 PG 8 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PN498 UT WOS:A1994PN49800019 ER PT J AU ROBINSON, MT AF ROBINSON, MT TI BASIC PHYSICS OF RADIATION-DAMAGE PRODUCTION SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT International Summer School on the Fundamentals of Radiation Damage CY AUG 01-02, 1993 CL UNIV ILLINOIS, FREDERICK SEITZ MAT RES LAB, URBANA, IL HO UNIV ILLINOIS, FREDERICK SEITZ MAT RES LAB ID BINARY-COLLISION APPROXIMATION; COMPUTER-SIMULATION; DISPLACEMENT DAMAGE; ENERGY; CASCADES; SOLIDS; ATOMS; IONS; BOMBARDMENT; MOLECULES AB The basic physical processes underlying the production of displacement damage in irradiated solids are briefly discussed, including topics from nuclear, atomic, and solid-state physics. Following a general introduction, the concepts of elementary cascade theory are presented as a basis for intuitive descriptions of the damage process. Then the production of primary recoils, mainly by nuclear processes, is discussed in enough detail to prepare a basis for calculating the primary-recoil energy spectra in typical irradiation facilities. The slowing down of fast atomic particles in solids is next discussed as a basis for developing atomistic models of damage production. Finally, several aspects of damage production, as revealed by atomistic simulation models, are outlined. RP ROBINSON, MT (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 147 TC 139 Z9 141 U1 1 U2 35 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 OCT PY 1994 VL 216 BP 1 EP 28 DI 10.1016/0022-3115(94)90003-5 PG 28 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA PL675 UT WOS:A1994PL67500002 ER PT J AU GREENWOOD, LR AF GREENWOOD, LR TI NEUTRON INTERACTIONS AND ATOMIC RECOIL SPECTRA SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT International Summer School on the Fundamentals of Radiation Damage CY AUG 01-02, 1993 CL UNIV ILLINOIS, FREDERICK SEITZ MAT RES LAB, URBANA, IL HO UNIV ILLINOIS, FREDERICK SEITZ MAT RES LAB ID IRRADIATION FACILITIES; PROPERTY CHANGES; FUSION AB This paper presents a discussion of neutron interactions with materials that lead to activation, transmutation, and atomic displacements. The emphasis will be on current applications including neutron irradiation facilities, neutron dosimetry techniques, and computer codes for spectral adjustment and radiation damage calculations. RP GREENWOOD, LR (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. RI Greenwood, Lawrence/H-9539-2016 OI Greenwood, Lawrence/0000-0001-6563-0650 NR 39 TC 48 Z9 49 U1 2 U2 12 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 OCT PY 1994 VL 216 BP 29 EP 44 DI 10.1016/0022-3115(94)90004-3 PG 16 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA PL675 UT WOS:A1994PL67500003 ER PT J AU MANSUR, LK AF MANSUR, LK TI THEORY AND EXPERIMENTAL BACKGROUND ON DIMENSIONAL CHANGES IN IRRADIATED ALLOYS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID POINT-DEFECTS; NI-ALLOYS; CREEP; DIFFUSION; DISLOCATIONS; MECHANISM; DAMAGE; HELIUM AB When a material is irradiated with energetic neutrons or charged particles, a complex sequence of reactions takes place. Structure, composition, and properties are altered over an extremely wide scale, spanning atomic defects, meso-scale microstructures and macroscopic properties. Particularly interesting are radiation-induced dimensional changes. Such changes, which can occur in engineered components of fission and fusion reactors on a scale of meters, are driven by lattice defects at the subnanometer level. Because of their technological importance and their high scientific challenge, the dimensional changes termed radiation-induced swelling and creep have elicited sustained intensive research by basic and applied materials scientists for many years. The present paper is intended as a brief tutorial on salient features of this work. The presentation is divided into three parts. Background is first sketched emphasizing experimentally observed features and applications. Next, the theoretical framework and specific models that have been developed to understand radiation-induced swelling and creep in isotropic materials are described. Lastly, selected experiments designed and/or interpreted in terms of theory are highlighted to illustrate the current state of understanding of the physical bases of these phenomena. RP MANSUR, LK (reprint author), OAK RIDGE NATL LAB, DIV MET & CERAM, POB 2008, OAK RIDGE, TN 37831 USA. NR 61 TC 126 Z9 126 U1 4 U2 33 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 EI 1873-4820 J9 J NUCL MATER JI J. Nucl. Mater. PD OCT PY 1994 VL 216 BP 97 EP 123 DI 10.1016/0022-3115(94)90009-4 PG 27 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA PL675 UT WOS:A1994PL67500008 ER PT J AU KENIK, EA AF KENIK, EA TI APPLICATION OF ANALYTICAL ELECTRON-MICROSCOPY TO RADIATION-DAMAGE STUDIES SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT International Summer School on the Fundamentals of Radiation Damage CY AUG 01-02, 1993 CL UNIV ILLINOIS, FREDERICK SEITZ MAT RES LAB, URBANA, IL HO UNIV ILLINOIS, FREDERICK SEITZ MAT RES LAB ID IRRADIATED STAINLESS-STEELS; FIM-ATOM PROBE; INDUCED SEGREGATION; PCT COPPER; PRECIPITATION; IRON-1.4 AB Analytical electron microscopy (AEM) provides a suite of techniques to characterize the microstructural, crystallographic, and elemental and chemical state of a material at high spatial resolution. The broad materials characterization possible with AEM has aided in the understanding of processes operating during radiation damage, especially in complex, multiphase materials. These AEM techniques are derived from the strong interaction of electrons with matter and the myriad of signals provided by that interaction. Through the application of a variety of these AEM techniques, a detailed and complete understanding of the state of a material and the changes induced by irradiation can be achieved. This review paper will deal briefly with the origin, capabilities, spatial resolution, and current developments of AEM. Several applications of AEM to radiation damage studies will be discussed to illustrate the utility of this suite of AEM techniques. RP KENIK, EA (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 63 TC 11 Z9 11 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD OCT PY 1994 VL 216 BP 157 EP 169 DI 10.1016/0022-3115(94)90011-6 PG 13 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA PL675 UT WOS:A1994PL67500010 ER PT J AU BACON, DJ DELARUBIA, TD AF BACON, DJ DELARUBIA, TD TI MOLECULAR-DYNAMICS COMPUTER-SIMULATIONS OF DISPLACEMENT CASCADES IN METALS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT International Summer School on the Fundamentals of Radiation Damage CY AUG 01-02, 1993 CL UNIV ILLINOIS, FREDERICK SEITZ MAT RES LAB, URBANA, IL HO UNIV ILLINOIS, FREDERICK SEITZ MAT RES LAB ID COLLISION THEORY; THERMAL SPIKES; POINT-DEFECT; DAMAGE; CU; TEMPERATURE; ENERGY; IRRADIATION; THRESHOLD; ALLOYS AB MD simulations of displacement cascades have become important in the study of atomic-scale processes in radiation damage. Here, we review recent advances and discuss results on a variety of processes in pure metals and alloys. The MD procedures, and the many-body interatomic potentials on which most recent simulations are based, are described, and then the general features of cascades in metals are reviewed. The ways in which the cascade state during the thermal-spike phase can be investigated are presented, and it is found that a liquid-like core is generated for cascade energies above 1 to 2 keV. This is shown to have important consequences for atomic mixing, disordering in ordered alloys, and vacancy clustering. Frenkel-pair production efficiency in the primary damage state at the end of the cascade process is found to be well below the NRT theoretical value in all the metals and alloys modelled to date. Clustering of interstitials is a persistent feature of cascade simulations for all pure metals. The mechanisms underlying these results are discussed, and it is observed that the simulations are in generally good agreement with what has been found by experiment. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP BACON, DJ (reprint author), UNIV LIVERPOOL,DEPT MAT SCI & ENGN,POB 147,LIVERPOOL L69 3BX,ENGLAND. NR 62 TC 187 Z9 187 U1 3 U2 43 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 OCT PY 1994 VL 216 BP 275 EP 290 DI 10.1016/0022-3115(94)90016-7 PG 16 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA PL675 UT WOS:A1994PL67500015 ER PT J AU HOBBS, LW CLINARD, FW ZINKLE, SJ EWING, RC AF HOBBS, LW CLINARD, FW ZINKLE, SJ EWING, RC TI RADIATION EFFECTS IN CERAMICS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID ALPHA-RECOIL DAMAGE; ENHANCED ELECTRICAL BREAKDOWN; NEUTRON-IRRADIATION DAMAGE; NUCLEAR WASTE STORAGE; DECAY EVENT DAMAGE; INDUCED CONDUCTIVITY; ISOTOPIC DISEQUILIBRIUM; ALKALI-HALIDES; POINT-DEFECTS; FUSION INSULATORS AB Ceramics represent a large class of solids with a wide spectrum of applicability, whose structures range from simple to complex, whose bonding runs from highly ionic to almost entirely covalent and, in some cases, partially metallic, and whose band structures yield wide-gap insulators, narrow-gap semiconductors or even superconductors. These solids exhibit responses to irradiation which are more complex than those for metals. In ceramic materials, atomic displacements can be produced by direct momentum transfer to often more than one distinguishable sublattice, and in some cases radiolytically by electronic excitations, and result in point defects which are in general not simple. Radiation-induced defect interaction, accumulation and aggregation modes differ significantly from those found in metals. Amorphization is a frequent option in response to high-density defect perturbation and is strongly related to structural topology. These fundamental responses to irradiation result in significant changes to important applicable properties, such as strength, toughness, electrical and thermal conductivities, dielectric response and optical behavior. The understanding of such phenomena is less well-understood than the simple responses of metals but is being increasingly driven by critical applications in fusion energy production, nuclear waste disposal and optical communications. C1 LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. UNIV NEW MEXICO, ALBUQUERQUE, NM 87131 USA. RP MIT, CAMBRIDGE, MA 02139 USA. OI Zinkle, Steven/0000-0003-2890-6915 NR 249 TC 211 Z9 212 U1 8 U2 90 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 EI 1873-4820 J9 J NUCL MATER JI J. Nucl. Mater. PD OCT PY 1994 VL 216 BP 291 EP 321 DI 10.1016/0022-3115(94)90017-5 PG 31 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA PL675 UT WOS:A1994PL67500016 ER PT J AU WAS, GS BRUEMMER, SM AF WAS, GS BRUEMMER, SM TI EFFECTS OF IRRADIATION ON INTERGRANULAR STRESS-CORROSION CRACKING SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT International Summer School on the Fundamentals of Radiation Damage CY AUG 01-02, 1993 CL UNIV ILLINOIS, FREDERICK SEITZ MAT RES LAB, URBANA, IL HO UNIV ILLINOIS, FREDERICK SEITZ MAT RES LAB ID GRAIN-BOUNDARY SEGREGATION; RADIATION-INDUCED SEGREGATION; AUSTENITIC STAINLESS-STEELS; FREELY-MIGRATING DEFECTS; NEUTRON-IRRADIATION; ALLOYS; PHOSPHORUS; BEHAVIOR; ION AB Intergranular stress corrosion cracking (IASCC) is a pervasive and generic problem in current light water reactor and advanced reactor designs that can lead to widespread component failure. IASCC is believed to be due to either to changes in the grain boundary composition, the microstructure or the water chemistry and corrosion potential. Of greatest interest are the changes in composition and microstructure since IASCC exhibits a well-defined, although not invariant, dose threshold. Changes in grain boundary composition are a result of radiation-induced segregation (RIS) and result in enrichment of nickel, depletion of chromium as well as changes in the impurity element compositions at the grain boundary. Although the basic theory of RIS is believed to be understood, quantitative descriptions of observed changes are not yet possible and hinder the correlation between RIS and IASCC. Changes in the microstructure are intimately linked to the strength and ductility of the irradiated alloy and strong correlations between IASCC and irradiated yield strength have been found. However, a fundamental understanding of the deformation mechanisms and the way in which deformation is coupled to IG cracking in alloys irradiated under LWR conditions (250-360-degrees-C, 1-5 dpa) is lacking. Finally, although radiation is known to affect IGSCC through changes in water chemistry and corrosion potential, it is not a necessary condition. Overshadowing and slowing progress on this important problem is a lack of well-defined-data from properly irradiated and properly characterized materials, due principally to inherent experimental and financial difficulties. As such, the specific mechanism(s) of IASCC remain unknown. C1 UNIV MICHIGAN, DEPT MAT SCI & ENGN, ANN ARBOR, MI 48109 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP WAS, GS (reprint author), UNIV MICHIGAN, DEPT NUCL ENGN, ANN ARBOR, MI 48109 USA. NR 62 TC 79 Z9 80 U1 1 U2 27 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 OCT PY 1994 VL 216 BP 326 EP 347 DI 10.1016/0022-3115(94)90019-1 PG 22 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA PL675 UT WOS:A1994PL67500018 ER PT J AU BRUEMMER, SM WAS, GS AF BRUEMMER, SM WAS, GS TI MICROSTRUCTURAL AND MICROCHEMICAL MECHANISMS CONTROLLING INTERGRANULAR STRESS-CORROSION CRACKING IN LIGHT-WATER-REACTOR SYSTEMS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT International Summer School on the Fundamentals of Radiation Damage CY AUG 01-02, 1993 CL UNIV ILLINOIS, FREDERICK SEITZ MAT RES LAB, URBANA, IL HO UNIV ILLINOIS, FREDERICK SEITZ MAT RES LAB ID GRAIN-BOUNDARY SEGREGATION; AUSTENITIC STAINLESS-STEEL; HIGH-TEMPERATURE WATER; CR-FE ALLOYS; SUSCEPTIBILITY; NI-16CR-9FE; BEHAVIOR; CREEP AB This review paper examines mechanisms controlling IGSCC in selected LWR components. Emphasis is placed on identifying material microstructures and microchemistries which promote susceptibility to premature failure. Two important examples are evaluated in some detail: stainless steel pipe cracking and primary-side SCC of alloy 600 steam generator tubing. In each case, grain boundary segregation and precipitation phenomena in these materials are reviewed and assessed relative to the mechanisms of IGSCC. This paper summarizes materials presented at the 1993 International Summer School on the Fundamentals of Radiation Damage held at the University of Illinois. A more comprehensive overview of SCC mechanisms and LWR examples was provided at the school, but will not be included in this article. Microstructural and microchemical aspects controlling IGSCC described here serve as a lead-in to the following paper focussing on how irradiation influences SCC resistance of reactor core components. C1 UNIV MICHIGAN, DEPT NUCL ENGN, ANN ARBOR, MI 48109 USA. UNIV MICHIGAN, DEPT MAT SCI & ENGN, ANN ARBOR, MI 48109 USA. RP BRUEMMER, SM (reprint author), PACIFIC NW LAB, DEPT MAT SCI, RICHLAND, WA 99352 USA. NR 80 TC 79 Z9 81 U1 1 U2 30 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 OCT PY 1994 VL 216 BP 348 EP 363 DI 10.1016/0022-3115(94)90020-5 PG 16 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA PL675 UT WOS:A1994PL67500019 ER PT J AU FEINENDEGEN, LE AF FEINENDEGEN, LE TI MICRODOSIMETRIC CONSIDERATIONS OF HEPATIC RADIOEMBOLIZATION SO JOURNAL OF NUCLEAR MEDICINE LA English DT Editorial Material ID RADIATION-THERAPY; LIVER RP FEINENDEGEN, LE (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. NR 15 TC 2 Z9 2 U1 0 U2 0 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 20190-5316 SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD OCT PY 1994 VL 35 IS 10 BP 1644 EP 1646 PG 3 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA PK362 UT WOS:A1994PK36200016 PM 7931663 ER PT J AU MERKLE, KL AF MERKLE, KL TI ATOMIC-STRUCTURE OF GRAIN-BOUNDARIES SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Symposium on Atomic Scale Imperfections in Materials - R W Balluffi Fest, at the Fall 1993 Materials-Research-Society Meeting CY NOV 29-DEC 01, 1993 CL BOSTON, MA SP MAT RES SOC DE INTERFACES; OXIDES; METALS; ELECTRON MICROSCOPY; DEFECTS ID RESOLUTION ELECTRON-MICROSCOPY; TILT BOUNDARIES; ENERGY; METALS; FCC; INTERFACES; ALUMINUM; PLANES; NIO AB Atomic-scale structures of fee oxide and metal grain boundaries are investigated by high-resolution electron microscopy. This paper focuses on the examination of structures that evolve when the grain boundary deviates from the ideal planar and periodic geometry. Examples are given for atomic-scale grain boundary steps with and without dislocation character. The misorientation dependence of atomic-scale grain boundary structures is investigated in (1 $($) over bar$$ 10) tilt grain boundaries of gold near the (113)(113) low-energy cusp. Common grain boundary relaxation modes include those of slacking disorder, low-index asymmetric facets and microfacets. All of the observed structures and atomic relaxation modes in grain boundaries are consistent with the short-range nature of the interatomic interactions which lead to misfit localization and a tendency to preserve as much as possible the atomic coordination of the defect-free solid. RP MERKLE, KL (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 35 TC 38 Z9 38 U1 1 U2 9 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 OCT PY 1994 VL 55 IS 10 BP 991 EP 1005 DI 10.1016/0022-3697(94)90119-8 PG 15 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA PV616 UT WOS:A1994PV61600014 ER PT J AU SIEGEL, RW AF SIEGEL, RW TI WHAT DO WE REALLY KNOW ABOUT THE ATOMIC-SCALE STRUCTURES OF NANOPHASE MATERIALS SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Symposium on Atomic Scale Imperfections in Materials - R W Balluffi Fest, at the Fall 1993 Materials-Research-Society Meeting CY NOV 29-DEC 01, 1993 CL BOSTON, MA SP MAT RES SOC DE NANOSTRUCTURES; METALS; OXIDES; DEFECTS; MICROSTRUCTURE ID ANGLE NEUTRON-SCATTERING; RANDOMLY ARRANGED ATOMS; SOLID-STATE STRUCTURE; NANOCRYSTALLINE MATERIALS; SINTERING CHARACTERISTICS; GRAIN-BOUNDARIES; TIO2; DIFFUSION; SPECTROSCOPY; PALLADIUM AB Robert W. Balluffi has spent a rich research lifetime critically investigating and elucidating the atomic-scale defect structures of materials. Now, a new class of ultrafine-grained materials has been created in which such defects exercise a dominant role. The structures of these new nanophase materials, both metals and ceramics, have been investigated over the past several years by a wide range of experimental methods. These studies have included observations by X-ray and neutron scattering, transmission and scanning electron microscopy, Mossbauer, Raman and poistron annihilation spectroscopy and, most recently, scanning tunneling and atomic force microscopy and nuclear magnetic resonance. While the experiments have yielded considerable useful information about the structures of nanophase materials on a Variety of length scales, much about the local atomic arrangements in the grains and interfaces of these materials remains to be elucidated. The present status of our knowledge of these structures is reviewed and some future research needs and opportunities are considered. RP SIEGEL, RW (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 58 TC 94 Z9 101 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 OCT PY 1994 VL 55 IS 10 BP 1097 EP 1106 DI 10.1016/0022-3697(94)90127-9 PG 10 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA PV616 UT WOS:A1994PV61600022 ER PT J AU SEIDMAN, DN SIEGEL, RW BRISTOWE, PD AF SEIDMAN, DN SIEGEL, RW BRISTOWE, PD TI ATOMIC-SCALE IMPERFECTIONS IN MATERIALS - A FESTSCHRIFT ISSUE IN HONOR OF BALLUFFI,ROBERT,W. - DEDICATION SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Editorial Material C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. MIT,DEPT MAT SCI & ENGN,CAMBRIDGE,MA 02139. RP SEIDMAN, DN (reprint author), NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,2225 SHERIDAN RD,EVANSTON,IL 60208, USA. RI Seidman, David/B-6697-2009 NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD OCT PY 1994 VL 55 IS 10 BP R7 EP R8 PG 2 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA PV616 UT WOS:A1994PV61600002 ER PT J AU FU, YG ANNIS, B BOLLER, A JIN, YM WUNDERLICH, B AF FU, YG ANNIS, B BOLLER, A JIN, YM WUNDERLICH, B TI ANALYSIS OF STRUCTURE AND PROPERTIES OF POLY(ETHYLENE-TEREPHTHALATE) FIBERS SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS LA English DT Article DE POLY(ETHYLENE TEREPHTHALATE); FIBER; X-RAY DIFFRACTION; CRYSTAL STRUCTURE; 3-PHASE MODEL; MODULUS; TENECITY; SHRINKAGE ID PARTIALLY ORIENTED POLYMERS; X-RAY-SCATTERING; SMALL-ANGLE SCATTERING; AMORPHOUS PHASE; PET FIBERS; POLY(ETHYLENE-TEREPHTHALATE) FIBERS; CRYSTALLINE POLYMERS; MORPHOLOGY; MODULUS; HETEROGENEITY AB The structures of four semicrystalline poly(ethylene terephthalate) fibers were analyzed with full-pattern (two-dimensional Rietveld) x-ray diffraction refinement, small-angle x-ray scattering, and thermal mechanical analysis, and compared to some of their known mechanical properties. The classical two-phase model of crystal and amorphous phases were unable to correlate structure and properties. We found that there must be a third phase, an oriented, intermediate phase, located mainly between the fibrils. About 1/3 of the intensity of fiber diffraction of the analyzed samples was contributed from such intermediate phase. For some fiber properties the intermediate phase plays a similar role as proposed for ''taut tie molecules.'' A simple model for the description of structure-insensitive properties of PET fibers was developed, based on this quantitative separation into three phases. The oriented intermediate phase changes the definition and calculation of the basic parameters of the fiber structure, such as crystallinity and orientation. Based on small-angle x-ray evidence, the crystallites are assumed to be separated by layers of largely amorphous material, both surrounded by the intermediate phase. The initial modulus of the fiber is determined mainly by the amount and orientation of the intermediate phase which has a maximum modulus of about 500 g/d on full orientation instead of the earlier predicted 150 g/d for fully oriented semicrystalline fibers. Based on the relationship between tenacity and average orientation function, the maximum tenacity for PET fibers of a structure like the ones analyzed may reach 20-45 g/d instead of earlier predictions of 10 g/d. The additional information needed to understand the structure-sensitive property of shrinkage is discussed. Presently easily accessible parameters have no quantitative predictive capabilities. (C) 1994 John Wiley & Sons, Inc. C1 UNIV TENNESSEE, DEPT CHEM, KNOXVILLE, TN 37996 USA. OAK RIDGE NATL LAB, DIV CHEM & ANALYT SCI, OAK RIDGE, TN 37831 USA. NR 57 TC 79 Z9 81 U1 1 U2 21 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0887-6266 EI 1099-0488 J9 J POLYM SCI POL PHYS JI J. Polym. Sci. Pt. B-Polym. Phys. PD OCT PY 1994 VL 32 IS 13 BP 2289 EP 2306 DI 10.1002/polb.1994.090321316 PG 18 WC Polymer Science SC Polymer Science GA PH558 UT WOS:A1994PH55800016 ER PT J AU MITCHELL, T MORRIS, M YLVISAKER, D AF MITCHELL, T MORRIS, M YLVISAKER, D TI ASYMPTOTICALLY OPTIMUM EXPERIMENTAL-DESIGNS FOR PREDICTION OF DETERMINISTIC FUNCTIONS GIVEN DERIVATIVE INFORMATION SO JOURNAL OF STATISTICAL PLANNING AND INFERENCE LA English DT Article DE COMPUTER EXPERIMENTS; BAYESIAN METHODS; DERIVATIVE INFORMATION; MINIMAX AND MAXIMIN DISTANCE DESIGNS ID COMPUTER EXPERIMENTS AB The paper considers problems of optimal design for deterministic response surface experiments, specifically computer experiments, when derivative information as well as the response itself are available at each design site. We adopt a Bayesian perspective. The considerable difficulty in finding G-, D- or A-optimum designs when a fixed prior is placed on the response space then leads us to investigate these problems asymptotically for a sequence of priors in which intersite correlations become progressively weaker. In two settings carrying notions of distance, we show that for prediction of the response and its derivatives, asymptotically D-optimum designs are necessarily maximin distance designs. When predicting only the response, asymptotically G-optimum designs are necessarily minimax distance designs. For prediction of the response, our asymptotic D- and A-optimality conditions agree but, as the condition is not really useful, we do no more than state what it is. C1 OAK RIDGE NATL LAB, DIV ENGN PHYS & MATH, OAK RIDGE, TN 37831 USA. UNIV CALIF LOS ANGELES, DEPT MATH, LOS ANGELES, CA 90024 USA. NR 10 TC 3 Z9 3 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3758 J9 J STAT PLAN INFER JI J. Stat. Plan. Infer. PD OCT PY 1994 VL 41 IS 3 BP 377 EP 389 DI 10.1016/0378-3758(94)90030-2 PG 13 WC Statistics & Probability SC Mathematics GA PH598 UT WOS:A1994PH59800009 ER PT J AU LEHMANN, UG DELONG, LE WANG, HH CARLSON, KD WILLIAMS, JM AF LEHMANN, UG DELONG, LE WANG, HH CARLSON, KD WILLIAMS, JM TI VIBRATING REED STUDY OF THE FLUX-LINE DYNAMICS OF KAPPA-(ET)2CU[N(CN)2]BR SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE VIBRATING REED; TYPE-II SUPERCONDUCTORS; ORGANIC SUPERCONDUCTORS; FLUX PINNING; VORTEX LATTICE MELTING ID PRESSURE ORGANIC SUPERCONDUCTOR; LATTICE; BEHAVIOR; NBSE2; DISSIPATION; FIELD AB Vibrating reed measurements were performed on single-crystal samples of kappa-(ET)2-Cu[N(CN)2]Br in an applied magnetic field H oriented either parallel (''longitudinal'') or perpendicular (''transverse'') to the highly conducting ac-plane. Field-cooling data taken for the longitudinal orientation and H < 0.7 T revealed a peak with a low-temperature shoulder in the reed dissipation 1/Q located at temperature T(Q) below the superconducting transition temperature T(c) (almost-equal-to 11.6 for H = 0). The shoulder disappeared near H almost-equal-to 0.7 T, accompanied by an abrupt change in the slope of T(Q)(H), corresponding to a similar change in the slope of the upper critical magnetic field H(c)2 measured by Kwok et al. The existence of the shoulder in the dissipation peak bears on a number of current explanations for the exotic superconducting properties of kappa(ET)2Cu[N(CN)2]Br. T(Q) data taken for the transverse orientation fell far below estimates of H(c2), indicating the existence of a substantial region of flux line (FL) mobility below H(c2)(T). The location of a peak min NMR relaxation observed by De Soto et al. lies close to T(Q) for the transverse orientation. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP LEHMANN, UG (reprint author), UNIV KENTUCKY,DEPT PHYS & ASTRON,LEXINGTON,KY 40506, USA. NR 22 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD OCT PY 1994 VL 7 IS 5 BP 793 EP 797 DI 10.1007/BF01320871 PG 5 WC Physics, Applied; Physics, Condensed Matter SC Physics GA PN839 UT WOS:A1994PN83900003 ER PT J AU XU, ZG DELONG, LE BRILL, JW HOU, JC DRULIS, H ZHENG, Y HINKS, DG NORTON, ML TANG, HY BROCK, CP AF XU, ZG DELONG, LE BRILL, JW HOU, JC DRULIS, H ZHENG, Y HINKS, DG NORTON, ML TANG, HY BROCK, CP TI VIBRATING REED STUDY OF THE FLUX-LINE DISSIPATION OF CERAMIC AND SINGLE-CRYSTAL (BA, K)BIO3 SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE VIBRATING REED; TYPE-II SUPERCONDUCTORS; OXIDE SUPERCONDUCTORS; FLUX P INNING; VORTEX LATTICE MELTING ID HIGH-TC SUPERCONDUCTORS; CRITICAL-FIELD; NBSE2; BA1-XKXBIO3; LATTICE; REGION; NB AB Vibrating reed (VR) and dc and ac magnetic susceptibility measurements were performed on a nominal single crystal of composition (Ba0.64K0.36)BiO3 in an applied magnetic field H. Field-cooling and field-sweep data revealed multiple peaks in the reed dissipation 1/Q located below the superconducting transition temperature T(c)(almost-equal-to 29.6 K for H = 0). A shoulder or onset (with increasing T) of dissipation appears for T less-than-or-equal-to 18 K, which may be a signature of a flux lattice melting transition. VR data for dense ceramic samples of composition (Ba0.625K0.375)BiO3 (T(c) = 28.6 K) exhibit a relatively narrow and smooth peak in 1/Q that corresponds well to a broad, intermediate-temperature peak in the crystal data. Resistivity experiments demonstrate that the single ceramic peak occurs well below the temperature at which the electrical resistance R almost-equal-to 0, suggesting that the higher-temperature crystalline peaks are positioned close to the upper critical field line and may be strongly dependent upon grain size or surface properties. Both ac and dc susceptibility data show no clear evidence for multiple phases or gross compositional inhomogeneities in the crystalline sample. Our results demonstrate that the VR technique is an extremely sensitive method to probe sample inhomogeneities and their role in flux pinning phenomena. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. NATL TSING HUA UNIV,CTR MAT SCI,HSINCHU 300,TAIWAN. UNIV KENTUCKY,DEPT CHEM,LEXINGTON,KY 40506. MARSHALL UNIV,DEPT CHEM,HUNTINGTON,WV 25755. RP XU, ZG (reprint author), UNIV KENTUCKY,DEPT PHYS & ASTRON,LEXINGTON,KY 40506, USA. NR 19 TC 2 Z9 2 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 OCT PY 1994 VL 7 IS 5 BP 835 EP 839 DI 10.1007/BF01320879 PG 5 WC Physics, Applied; Physics, Condensed Matter SC Physics GA PN839 UT WOS:A1994PN83900011 ER PT J AU KRESIN, VZ WOLF, SA AF KRESIN, VZ WOLF, SA TI SYMMETRY OF THE PAIRING STATE IN THE HIGH-T(C) OXIDES SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE SYMMETRY OF THE PAIRING; GAPLESSNESS; YBCO; CUPRATES ID TEMPERATURE-DEPENDENCE; WAVE SUPERCONDUCTIVITY; PENETRATION DEPTH; THIN-FILMS; YBA2CU3O7; ANISOTROPY; TC AB There are conflicting experimental data related to the symmetry of the order parameter in cuprate superconductors. Our previously developed concept, which contains unusual s-wave pairing with a two-gap spectrum, energy gap anisotropy, and gaplessness for a nonstoichiometric state, provides a unified and consistent description of experimental data related to the symmetry. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KRESIN, VZ (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Wolf, Stuart/A-7513-2009 NR 33 TC 8 Z9 8 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 OCT PY 1994 VL 7 IS 5 BP 865 EP 869 DI 10.1007/BF01320884 PG 5 WC Physics, Applied; Physics, Condensed Matter SC Physics GA PN839 UT WOS:A1994PN83900016 ER PT J AU PADMORE, HA WARWICK, T AF PADMORE, HA WARWICK, T TI SOFT-X-RAY MONOCHROMATORS FOR 3RD-GENERATION UNDULATOR SOURCES SO JOURNAL OF SYNCHROTRON RADIATION LA English DT Article DE SOFT X-RAYS; MONOCHROMATORS; UNDULATORS; X-RAY SPECTROSCOPY; MICROSCOPY ID ADVANCED LIGHT-SOURCE; GRAZING-INCIDENCE MONOCHROMATOR; LINE-SPACE GRATINGS; SYNCHROTRON RADIATION; BEAM LINES; HIGH-POWER; SPECTROSCOPY; PERFORMANCE; DESIGN; MIRROR AB Over the past ten years, the resolving power from new designs of bending-magnet-based soft X-ray monochromators has increased by more than an order of magnitude. This has led to a revolution in soft X-ray spectroscopy, but the limited flux at this high resolution has allowed only relatively efficient measurements to be made, such as photo-absorption. Application of this new tool of high-resolution spectroscopy to photoemission, energy-resolved fluorescence spectroscopy and microscopy has now been made possible with the advent of undulator sources of soft X-rays. Here we have reviewed the recent development of undulator-based soft X-ray monochromators, the special features of undulators in general and the resulting benefits and problems, and describe the state of the art undulator beamline, 7.0 at the Advanced Light Source. In addition, we offer some speculation as to the possible routes to the next or ultimate generation of soft X-ray monochromator. RP PADMORE, HA (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ACCELERATOR & FUS RES,ADV LIGHT SOURCE,BERKELEY,CA 94720, USA. NR 66 TC 20 Z9 21 U1 1 U2 2 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0909-0495 J9 J SYNCHROTRON RADIAT JI J. Synchrot. Radiat. PD OCT 1 PY 1994 VL 1 BP 27 EP 36 DI 10.1107/S0909049594007041 PN 1 PG 10 WC Instruments & Instrumentation; Optics; Physics, Applied SC Instruments & Instrumentation; Optics; Physics GA RP377 UT WOS:A1994RP37700005 PM 16728781 ER PT J AU MCWHAN, DB AF MCWHAN, DB TI SYNCHROTRON-RADIATION IN THE STUDY OF MAGNETISM SO JOURNAL OF SYNCHROTRON RADIATION LA English DT Article DE MAGNETISM; MAGNETOOPTICAL EFFECTS ID X-RAY-SCATTERING; CORE-LEVEL PHOTOEMISSION; RESONANCE EXCHANGE SCATTERING; SPIN-RESOLVED PHOTOEMISSION; QUANTUM-WELL STATES; GD-Y SUPERLATTICE; LONG-RANGE ORDER; CIRCULAR-DICHROISM; FE; ABSORPTION AB The use of synchrotron radiation in the study of magnetism is reviewed. An overview of resonant and non-resonant magnetic scattering is given along with their relation to well known magneto-optical effects such as magnetic linear and circular dichroism, Faraday rotation, and the magneto-optical Kerr effect. The use of these effects is reviewed for ferromagnetic iron, antiferromagnetic holmium and magnetic multilayers. RP MCWHAN, DB (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 63 TC 19 Z9 19 U1 2 U2 4 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0909-0495 J9 J SYNCHROTRON RADIAT JI J. Synchrot. Radiat. PD OCT 1 PY 1994 VL 1 BP 83 EP 90 DI 10.1107/S0909049594006783 PN 1 PG 8 WC Instruments & Instrumentation; Optics; Physics, Applied SC Instruments & Instrumentation; Optics; Physics GA RP377 UT WOS:A1994RP37700013 PM 16728789 ER PT J AU LU, CH DEJONGHE, LC AF LU, CH DEJONGHE, LC TI INFLUENCE OF ND2O3 DOPING ON THE REACTION PROCESS AND SINTERING BEHAVIOR OF BACEO3 CERAMICS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID FUEL-CELLS; SOLID ELECTROLYTES; PROTON; CONDUCTION; AL2O3; TIO2 AB The influence of Nd2O3 doping on the reaction process and sintering behavior of BaCeO3 is investigated. Formation of BaCeO3 is initiated at 800-degrees-C and completed at 1000-degrees-C. When Nd2O3 is added to the starting materials, the formation of BaCe1-xNdxO3-delta is delayed and the temperature for complete reaction is increased to 1100-degrees-C. Only a BaCe1-xNdxO3-delta solid solution with an orthorhombic crystal structure is present in the specimens for x less-than-or-equal-to 0.1. A secondary phase rich in Ce and Nd is formed within grains and at grain boundaries, when the Nd2O3 content is greater than the solubility limit (x greater-than-or-equal-to 0.2). Pure BaCeO3 is difficult to sinter, even at 1500-degrees-C, and only a porous microstructure could be obtained. However, doping BaCeO3 with Nd2O3 markedly enhances its sinterability. The enhancement of the sinterability of Nd2O3-doped specimens at x less-than-or-equal-to 0.1 is attributed to the increase in the concentration of oxygen ion vacancies, which increases the diffusion rate. At x less-than-or-equal-to 0.2, the grain size is abnormally coarsened, which is caused by the formation of a liquid phase. While this liquid phase accelerates sintering, its beneficial effect on densification is counteracted by the segregation of the secondary grain-boundary phase which inhibits sintering. C1 LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. RP LU, CH (reprint author), NATL TAIWAN UNIV,DEPT CHEM ENGN,TAIPEI,TAIWAN. NR 19 TC 14 Z9 14 U1 0 U2 3 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD OCT PY 1994 VL 77 IS 10 BP 2523 EP 2528 DI 10.1111/j.1151-2916.1994.tb04638.x PG 6 WC Materials Science, Ceramics SC Materials Science GA PM483 UT WOS:A1994PM48300005 ER PT J AU SINGH, D SINGH, JP MAJUMDAR, S KUPPERMAN, DS COWDIN, E BHATT, RT AF SINGH, D SINGH, JP MAJUMDAR, S KUPPERMAN, DS COWDIN, E BHATT, RT TI EFFECT OF PROCESSING VARIABLES ON INTERFACIAL PROPERTIES OF AN SIC-FIBER-REINFORCED REACTION-BONDED SI3N4 MATRIX COMPOSITE SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID CERAMIC-MATRIX; MECHANICAL-PROPERTIES; PUSHOUT TESTS; GLASS; STRENGTH; ROUGHNESS; BEHAVIOR AB Fiber/matrix interfacial debonding and frictional sliding stresses were evaluated by single-fiber pushout tests on unidirectional continuous silicon-carbide-fiber-reinforced, reaction-bonded silicon nitride matrix composites. The debonding and maximum pushout loads required to overcome interfacial friction were obtained from load-displacement plots of pushout tests. Interfacial debonding and frictional sliding stresses were evaluated for composites with various fiber contents and fiber surface conditions (coated and uncoated), and after matrix densification by hot isostatic pressing (HIPing). For as-fabricated composites, both debonding and frictional sliding stresses decreased with increasing fiber content. The HIPed composites, however, exhibited higher interfacial debonding and frictional sliding stresses than those of the as-fabricated composites. These results were related to variations in axial and transverse residual stresses on fibers in the composites. A shearlag model developed for a partially debonded composite, including full residual stress field, was employed to analyze the nonlinear dependence of maximum pushout load on embedded fiber length for as-fabricated and HIPed composites. Interfacial friction coefficients of 0.1-0.16 fitted the experimental data well. The extremely high debonding stress observed in uncoated fibers is believed to be due to strong chemical bonding between fiber and matrix. C1 NASA,LEWIS RES CTR,USA,PROPULS DIRECTORATE,CLEVELAND,OH 44035. RP SINGH, D (reprint author), ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439, USA. NR 34 TC 13 Z9 13 U1 0 U2 5 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD OCT PY 1994 VL 77 IS 10 BP 2561 EP 2568 DI 10.1111/j.1151-2916.1994.tb04643.x PG 8 WC Materials Science, Ceramics SC Materials Science GA PM483 UT WOS:A1994PM48300010 ER PT J AU RAMAMURTY, U SURESH, S PETROVIC, JJ AF RAMAMURTY, U SURESH, S PETROVIC, JJ TI EFFECT OF CARBON ADDITION ON ELEVATED-TEMPERATURE CRACK-GROWTH RESISTANCE IN (MO,W)SI2-SICP COMPOSITE SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID MOLYBDENUM DISILICIDE; CREEP AB Experimental results on subcritical crack growth behavior of hot-pressed MoSi2-50 mol% WSi2 alloy reinforced with 30 vol% SiC particles in the temperature range 1200-degrees-1300-degrees-C are presented. The effect of 2 wt% C addition on the stable crack growth resistance of this composite was investigated under both static and cyclic loading conditions. The results indicate that the addition of carbon to the composite improves the subcritical crack growth resistance under both static and cyclic loads and increases the elevated temperature capabilities of the (Mo, W)Si2 composite. Increasing the temperature from 1200-degrees to 1300-degrees-C is found to increase the crack growth velocities with a concomitant decrease in the crack growth initiation thresholds. Electron microscopy of the crack-tip region indicates that the stable crack growth process is influenced primarily by interfacial cavitation. At 1300-degrees-C, deformation processes such as twinning of the SiC particles and dislocation motion within the matrix grains appear to play an active role in determining the crack growth kinetics. The role of glassy phase in influencing the high-temperature fracture behavior and its implications for design of the microstructures of the brittle materials are discussed. C1 MIT,DEPT MAT SCI & ENGN,CAMBRIDGE,MA 02139. LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. RP RAMAMURTY, U (reprint author), BROWN UNIV,DIV ENGN,PROVIDENCE,RI 02912, USA. RI Ramamurty, Upadrasta/E-5623-2011 NR 22 TC 15 Z9 15 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 OCT PY 1994 VL 77 IS 10 BP 2681 EP 2688 DI 10.1111/j.1151-2916.1994.tb04661.x PG 8 WC Materials Science, Ceramics SC Materials Science GA PM483 UT WOS:A1994PM48300028 ER PT J AU BECHER, PF WARWICK, WH AF BECHER, PF WARWICK, WH TI FRACTURE STRENGTH FRACTURE-RESISTANCE RESPONSE AND DAMAGE RESISTANCE OF SINTERED AL2O3-ZRO2 (12 MOL-PERCENT CEO2) COMPOSITES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID TETRAGONAL ZIRCONIA POLYCRYSTALS; GRAIN-SIZE; MARTENSITIC-TRANSFORMATION; TOUGHENED CERAMICS; TOUGHNESS; BEHAVIOR; MICROSTRUCTURE; DEFORMATION; TZP AB The fracture strengths of sintered Al2O3 containing 20 and 40 vol% ZrO2 (12 mol% CeO2)-zirconia-toughened alumina (ZTA)-composites along with the fracture resistance can be increased (e.g., to approximately900 MPa and > 12 MPa.m1/2, respectively), by increasing the mean grain size of the t-ZrO2 (and the Al2O3) from approximately0.5 mum to approximately3 mum. At these lower t-ZrO2 contents, the fracture strength-fracture resistance curves show a continuous rise as opposed to the strength maxima observed in polycrystalline t-ZrO2(12 mol% CeO2), CeTZP, and ZrO2(12 mol% CeO2) ceramics containing less-than-or-equal-to 20 vol% Al2O3. The toughened composites also exhibit excellent damage resistance with fracture strengths of 500 MPa retained with surfaces containing approximately 150-N Vickers indentations which produce cracks of approximately 160-mum radius. Greater damage resistance correlates with an increase in the apparent R-curve response of these composites. RP BECHER, PF (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 24 TC 5 Z9 5 U1 2 U2 3 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD OCT PY 1994 VL 77 IS 10 BP 2689 EP 2692 DI 10.1111/j.1151-2916.1994.tb04662.x PG 4 WC Materials Science, Ceramics SC Materials Science GA PM483 UT WOS:A1994PM48300029 ER PT J AU WARREN, WL DIMOS, D TUTTLE, BA SMYTH, DM AF WARREN, WL DIMOS, D TUTTLE, BA SMYTH, DM TI ELECTRONIC AND IONIC TRAPPING AT DOMAIN-WALLS IN BATIO3 SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note ID DC ELECTRICAL DEGRADATION; PEROVSKITE-TYPE TITANATES; DEFECTS; ESR AB We have coupled electron paramagnetic resonance (EPR) and polarization-voltage measurements to understand the effects of reducing ambients on the remanent polarization and density of paramagnetic centers in BaTiO3 single crystals. Two types of reducing ambients were explored; one was done under vacuum (slightly reducing) and the second was performed in forming gas (very reducing). It is found that the vacuum anneal caused a reduction in the remanent polarization and a concomitant decrease in the isolated Fe3+ EPR resonance. The Fe3+-V(o) complex EPR signal was relatively unaffected by this vacuum anneal. By injecting charge using an ultraviolet (UV) light and an applied bias combination, the polarization and the isolated Fe3+ signal intensity were restored, thereby suggesting that the suppression of the remanent polarization is due to trapping of electronic charge at the domain walls. For the forming gas anneal, we observe a much larger decrease in remanent polarization with an accompanying decrease in both the isolated Fe3+ and Fe3+-V(o) complex EPR signals. For this anneal, charge injection by the UV light/bias combination did not restore the polarization nor the EPR densities. The remanent polarization, the isolated Fe3+, and the Fe3+-V(o) complex could be restored only by a reoxidizing anneal, suggesting that ionic defects (oxygen vacancies) are now responsible for pinning the domain walls. Collectively, these results suggest reducing anneals can suppress the amount of switchable polarization in BaTiO3 by either electronic or ionic trapping mechanisms. C1 LEHIGH UNIV,MAT RES CTR,BETHLEHEM,PA 18015. RP WARREN, WL (reprint author), SANDIA NATL LABS,ADV MAT LAB,ALBUQUERQUE,NM 87185, USA. NR 24 TC 40 Z9 40 U1 1 U2 18 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 OCT PY 1994 VL 77 IS 10 BP 2753 EP 2757 DI 10.1111/j.1151-2916.1994.tb04672.x PG 5 WC Materials Science, Ceramics SC Materials Science GA PM483 UT WOS:A1994PM48300039 ER PT J AU LIN, HT BECHER, PF FERBER, MK AF LIN, HT BECHER, PF FERBER, MK TI IMPROVEMENT OF TENSILE CREEP DISPLACEMENT MEASUREMENTS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note ID SILICONIZED SILICON-CARBIDE; BEHAVIOR; NITRIDE; DAMAGE AB A water-cooled copper shield is shown to minimize local temperature variations (hence, regulate the refractive index of the air) in the optical path traversed by a laser beam used to measure creep displacements in a tensile specimen. Both the scatter and the reliability of the elevated-temperature tensile creep displacement measurements have been significantly improved from +/-5 to +/-0.5 mum, which is comparable to that obtained at room temperature. Results achieved with this modification were demonstrated with a hot isostatically pressed (HIPed) silicon nitride ceramic containing 4 wt% Y2O3 as a sintering additive tested at 1370-degrees-C in air. Results also indicate that the creep rates can be independent of the specimen geometry (and size) and the gripping system. RP LIN, HT (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 17 TC 8 Z9 8 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 OCT PY 1994 VL 77 IS 10 BP 2767 EP 2770 DI 10.1111/j.1151-2916.1994.tb04675.x PG 4 WC Materials Science, Ceramics SC Materials Science GA PM483 UT WOS:A1994PM48300042 ER PT J AU HOFSTADLER, SA WAHL, JH BAKHTIAR, R ANDERSON, GA BRUCE, JE SMITH, RD AF HOFSTADLER, SA WAHL, JH BAKHTIAR, R ANDERSON, GA BRUCE, JE SMITH, RD TI CAPILLARY ELECTROPHORESIS FOURIER-TRANSFORM ION-CYCLOTRON RESONANCE MASS-SPECTROMETRY WITH SUSTAINED OFF-RESONANCE IRRADIATION FOR THE CHARACTERIZATION OF PROTEIN AND PEPTIDE MIXTURES SO JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY LA English DT Article ID SURFACE-INDUCED DISSOCIATION; INFRARED MULTIPHOTON DISSOCIATION; COLLISION-INDUCED DISSOCIATION; ELECTROSPRAY-IONIZATION; ZONE ELECTROPHORESIS; LARGE BIOMOLECULES; LARGE MOLECULES; GAS-PHASE; ACTIVATION; MUTATIONS AB A new approach to protein and peptide analysis that involves the coupling of on-line capillary electrophoresis-electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry with a variation of sustained off-resonance irradiation is described. With this technique, multiple irradiation frequencies are broadcast simultaneously, which yields fragmentation of species at different mass-to-charge ratio values from the same waveform. In conjunction with capillary electrophoresis, this technique can provide sequence information from small amounts of proteins or peptides in complex mixtures. Initial results obtained from a mixture of gramicidin S (1141 u), bee venom melittin (2845 u), and equine apomyoglobin (16,951 u) are presented. C1 PACIFIC NW LAB, DEPT CHEM SCI, CHEM METHODS & SEPARAT GRP, P8-19, RICHLAND, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 42 TC 45 Z9 45 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 1044-0305 J9 J AM SOC MASS SPECTR JI J. Am. Soc. Mass Spectrom. PD OCT PY 1994 VL 5 IS 10 BP 894 EP 899 DI 10.1016/1044-0305(94)87014-4 PG 6 WC Chemistry, Analytical; Chemistry, Physical; Spectroscopy SC Chemistry; Spectroscopy GA PK741 UT WOS:A1994PK74100003 PM 24226235 ER PT J AU MARKOVIC, NM ROSS, PN AF MARKOVIC, NM ROSS, PN TI A STUDY OF BISMUTH RUTHENATE AS AN ELECTROCATALYST FOR BIFUNCTIONAL AIR ELECTRODES SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID OXYGEN REDUCTION; GOLD AB The electrode kinetics of oxygen reduction and evolution on Ru, Ru/Bi(ad) and Bi2Ru2O7 electrodes were studied in 0.1M KOH. The transport and current shielding properties of the rotating ring-disk electrode technique were used to obtain the kinetic variables as well as to determine the stability of these electrodes. Relatively high catalytic activity for O2 reduction was observed on an Ru electrode. The catalytic activity of Ru was considerably reduced on the surface modified by ''irreversibly adsorbed'' Bi. The inhibition of O2 reduction was accompanied by a change in the reaction mechanism from a predominately direct ''four-electron pathway,'' characteristic for O2 reduction on pure Ru, to a significant branching of the reaction to the ''preoxide pathway'' on the Ru/Bi(ads) electrode. Bi2Ru2O7 exhibited low catalytic activity for O2 reduction and relatively high activity for peroxide decomposition and/or reduction. Although less active for oxygen evolution than either Ru or Ru/Bi(ad) electrodes, the Bi2Ru2O7 electrode is more stable during O2 evolution than either of these electrodes, with no dissolution products detected at the ring electrode. RP MARKOVIC, NM (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 28 TC 32 Z9 32 U1 0 U2 12 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD OCT PY 1994 VL 141 IS 10 BP 2590 EP 2598 PG 9 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA PM013 UT WOS:A1994PM01300006 ER PT J AU SUTIJA, DP TOBIAS, CW AF SUTIJA, DP TOBIAS, CW TI MASS-TRANSPORT ENHANCEMENT BY RISING BUBBLE CURTAINS SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID HYDROGEN EVOLUTION; FREE-CONVECTION; ELECTRODES AB Mass-transport enhancement by rising single and multiple bubble streams was monitored on a vertical electrode incorporating a mosaic of 100 x 100 mum sensing elements. Limiting current measurements of the reduction of ferric to ferrous sulfate revealed the presence of two distinct mechanisms: surface renewal is effective within a swath of five bubble diameters, while macroscopic laminar flows induced by rising bubbles contribute weaker enhancement over a wider path. Enhancement caused by a sheath of multiple side-by-side bubble streams can be well represented by the linear superposition of the effect of single streams. Generally, at equivalent volumetric rates, small bubbles are more effective than larger ones in reducing mass-transfer resistance to the underlying surface. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. NR 27 TC 11 Z9 11 U1 1 U2 6 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD OCT PY 1994 VL 141 IS 10 BP 2599 EP 2607 DI 10.1149/1.2059128 PG 9 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA PM013 UT WOS:A1994PM01300007 ER PT J AU ZHANG, ST KONG, FP MULLER, RH AF ZHANG, ST KONG, FP MULLER, RH TI EFFECT OF ION-IMPLANTATION ON THE CORROSION BEHAVIOR OF LEAD AND A LEAD-ANTIMONY ALLOY SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID ACID-BATTERY; PURE IRON; ELECTROCHEMICAL OXIDATION; H2O-H2SO4 MIXTURES; SULFURIC-ACID; TITANIUM; H2SO4; DISSOLUTION; VOLTAMMETRY; RESISTANCE AB Ion implantation of different metals in Pb and Pb-4% Sb has been found to improve the open-circuit corrosion resistance of the two metals in 5M H2SO4. Titanium ions were implanted under different conditions of ion dose and ion energy. Optimum implantation conditions resulted in an up to 72-fold reduction of corrosion currents. The implantation of V, Cr, Ni, and W has been investigated for one implantation condition and has also resulted in decreased corrosion currents. The corrosion behavior was characterized by the current response to small anodic potential steps. Surface analysis and depth profiles have shown the importance of the spacial distribution of the implanted ions for their effects on the anodic and cathodic parts of the corrosion reactions. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. NR 30 TC 1 Z9 1 U1 3 U2 7 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 OCT PY 1994 VL 141 IS 10 BP 2677 EP 2681 DI 10.1149/1.2059169 PG 5 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA PM013 UT WOS:A1994PM01300019 ER PT J AU FENG, JR JOHNSON, DC LOWERY, SN CAREY, JJ AF FENG, JR JOHNSON, DC LOWERY, SN CAREY, JJ TI ELECTROCATALYSIS OF ANODIC OXYGEN-TRANSFER REACTIONS - EVOLUTION OF OZONE SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID LEAD DIOXIDE ANODES; GENERATION; ELECTROLYSIS; ELECTRODES AB Current efficiencies are compared for the generation of O3 simultaneously with O2 during anodic discharge of H2O at pure and iron(III)-doped beta-lead dioxide film electrodes in phosphate buffer (pH 7.5, 10-degrees-C) containing 2.5 mM KF. Also examined is the effect of applied current density. A current efficiency of 14.6% was obtained for the Fe(III)-doped PbO2 film electrode deposited on an internally cooled (10-degrees-C) tubular titanium substrate at a current density of 200 mA cm-2 as compared to only 6.1% at the undoped PbO2 electrode under the same conditions. This result is tentatively explained on the basis of a mechanism involving the transfer of oxygen from hydroxyl radicals adsorbed on Pb(IV) sites adjacent to Fe(III) sites to O2 adsorbed at the Fe(III) sites in the surface of the Fe(III)-doped PbO2 electrodes. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. KODAK RES LABS,ENVIRONM SCI HAEL,ROCHESTER,NY 14650. RP FENG, JR (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 15 TC 57 Z9 61 U1 0 U2 5 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD OCT PY 1994 VL 141 IS 10 BP 2708 EP 2711 DI 10.1149/1.2059184 PG 4 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA PM013 UT WOS:A1994PM01300023 ER PT J AU ZHANG, JG BENSON, DK TRACY, CE DEB, SK CZANDERNA, AW CRANDALL, RS AF ZHANG, JG BENSON, DK TRACY, CE DEB, SK CZANDERNA, AW CRANDALL, RS TI OPTIMIZATION STUDY OF SOLID-STATE ELECTROCHROMIC DEVICES BASED ON WO3/LITHIUM-POLYMER ELECTROLYTE/V2O5 STRUCTURES SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID LIXWO3; FILMS; MICROSTRUCTURE AB Transmissive solid-state electrochromic devices based on the structure of WO3/lithium-polymer electrolyte/V2O5 were optimized for potential large-area window applictions. The electrochromic layer thicknesses, polymer molecular weights, lithium-containing electrolytes, preassembly lithium-ion injection amounts, and transparent conductor substrates were systematically investigated for large optical modulation and fast response of the devices. The transmittance of the optimized device at 633 nm can be switched between 74 and 12% in 1 min. The coloring and bleaching voltages were -1.8 and 1.2 V, respectively. RP ZHANG, JG (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 23 TC 37 Z9 40 U1 0 U2 3 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD OCT PY 1994 VL 141 IS 10 BP 2795 EP 2800 DI 10.1149/1.2059226 PG 6 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA PM013 UT WOS:A1994PM01300036 ER PT J AU ZHU, H WEITSMAN, Y AF ZHU, H WEITSMAN, Y TI THE PROGRESSION OF FAILURE MECHANISMS IN UNIDIRECTIONALLY REINFORCED CERAMIC COMPOSITES SO JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS LA English DT Article ID BRITTLE MATRIX COMPOSITES; STRENGTH; FRACTURE; STATISTICS; FIBERS AB This article presents a comprehensive mechanics model for the interactive progression of damage in unidirectionally reinforced ceramic composites under monotonically increasing tension parallel to the fiber direction. The damage mechanisms considered herein are matrix cracks, interfacial fiber/matrix slips and fiber failures. The density of matrix cracks, with the accompanying interfacial slips, is determined by an energy criterion while the progression of fiber failures is evaluated from various aspects of strength statistics in association with energy considerations. It is shown that the present model provides a reasonable prediction for the ductile-like stress-strain behavior of fiber-reinforced ceramics. C1 OAK RIDGE NATL LAB,DIV ENGN TECHNOL,OAK RIDGE,TN. RP ZHU, H (reprint author), UNIV TENNESSEE,DEPT ENGN SCI & MECH,KNOXVILLE,TN 37996, USA. NR 15 TC 24 Z9 25 U1 0 U2 2 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 OCT PY 1994 VL 42 IS 10 BP 1601 EP 1632 DI 10.1016/0022-5096(94)90089-2 PG 32 WC Materials Science, Multidisciplinary; Mechanics; Physics, Condensed Matter SC Materials Science; Mechanics; Physics GA PJ288 UT WOS:A1994PJ28800005 ER PT J AU BLAISE, J WYART, JF VERGES, J ENGLEMAN, R PALMER, BA RADZIEMSKI, LJ AF BLAISE, J WYART, JF VERGES, J ENGLEMAN, R PALMER, BA RADZIEMSKI, LJ TI ENERGY-LEVELS AND ISOTOPE SHIFTS FOR SINGLY IONIZED URANIUM (U-II) SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID ATOMIC URANIUM; SPECTROSCOPY AB New uranium hollow-cathode Fourier-transform spectra have been recorded between 1800 and 42 000 cm(-1). Combined with earlier visible and ultraviolet spectra, these have led to 354 odd levels and 809 even levels of singly ionized uranium (U II) belonging to four odd and six even configurations. High-resolution Fourier-transform spectra of an electrodeless discharge lamp containing (UI4)-U-238 and (UI4)-U-234 were used to measure splittings of more than 800 isotopic U II doublets to an accuracy of similar to 0.001 cm(-1). From these transition isotope shifts 114 odd- and 397 even-level isotope shifts were determined. C1 UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. LOS ALAMOS NATL LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545. WASHINGTON STATE UNIV,DEPT PHYS,PULLMAN,WA 99164. RP BLAISE, J (reprint author), CNRS,AIME COTTON LAB,BATIMENT 505,CAMPUS ORSAY,F-91405 ORSAY,FRANCE. NR 29 TC 11 Z9 11 U1 0 U2 7 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 OCT PY 1994 VL 11 IS 10 BP 1897 EP 1929 DI 10.1364/JOSAB.11.001897 PG 33 WC Optics SC Optics GA PL223 UT WOS:A1994PL22300001 ER PT J AU BORISOV, AB SHI, X KARPOV, VB KOROBKIN, VV SOLEM, JC SHIRYAEV, OB MCPHERSON, A BOYER, K RHODES, CK AF BORISOV, AB SHI, X KARPOV, VB KOROBKIN, VV SOLEM, JC SHIRYAEV, OB MCPHERSON, A BOYER, K RHODES, CK TI STABLE SELF-CHANNELING OF INTENSE ULTRAVIOLET PULSES IN UNDERDENSE PLASMA, PRODUCING CHANNELS EXCEEDING 100 RAYLEIGH LENGTHS SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID X-RAY AMPLIFICATION; LASER-PULSES; ACCELERATION AB Spatially confined propagation of high-power subpicosecond (similar to 270-fs) ultraviolet (248-nm) pulses has been experimentally studied in cold underdense plasma. The observed channels were longitudinally uniform, were approximately 1.4 mu m in diameter, and persisted for a length of 3-4 mm, a distance exceeding 100 Rayleigh ranges. X rays with a quantum energy > 0.5 keV were also detected from the zone of propagation in coincidence with the channel formation. The occurrence of self-channeling with the rapid formation of a stable, extended, and longitudinally homogeneous filament is in qualitative agreement with a theoretical picture involving relativistic and charge-displacement nonlinearities. C1 RUSSIAN ACAD SCI, INST GEN PHYS, MOSCOW 11794, RUSSIA. LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. RP BORISOV, AB (reprint author), UNIV ILLINOIS, DEPT PHYS, ATOM MOLEC & RADIAT PHYS LAB, ROOM 2136 SES, 845 W TAYLOR, CHICAGO, IL 60607 USA. NR 33 TC 66 Z9 67 U1 0 U2 4 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD OCT PY 1994 VL 11 IS 10 BP 1941 EP 1947 DI 10.1364/JOSAB.11.001941 PG 7 WC Optics SC Optics GA PL223 UT WOS:A1994PL22300004 ER PT J AU MARSHALL, CD SPETH, JA PAYNE, SA KRUPKE, WF QUARLES, GJ CASTILLO, V CHAI, BHT AF MARSHALL, CD SPETH, JA PAYNE, SA KRUPKE, WF QUARLES, GJ CASTILLO, V CHAI, BHT TI ULTRAVIOLET-LASER EMISSION PROPERTIES OF CE3+-DOPED LISRALF6 AND LICAALF6 SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID EXCITED-STATE-ABSORPTION; SINGLE-CRYSTALS; PHOTOIONIZATION; NM; CE-3+-YAG; GAIN; IONS AB The UV laser properties of trivalent cerium-doped LiSrAlF6 (Ce:LiSAF) and LiCaAlF6 (Ce:LiCAF) are reported. The polarized absorption, emission, and excited-state absorption cross sections for both Ce:LiSAF and Ce:LiCAF were determined for the 266-nm pump and 290-nm laser emission wavelengths. The single-exponential emission lifetime was measured to be 28 +/- 2 and 25 +/- 2 ns for Ce:LiSAF and Ce:LiCAF, respectively. The gain was found to be highest when the probe was polarized parallel to the optical axis of the crystal, owing to the anisotropic nature of the excited-state absorption. The excited-state absorption was ascribed to a transition from the 5d orbital of Ce3+ to the conduction band of the host. Laser slope efficiencies as high as 29% and 21%, respectively, were measured for Ce:LiSAF and Ce:LiCAF when the 266-nm pulsed pump beam was polarized parallel to the optical or the c axis. These are the highest laser slope efficiencies yet observed to our knowledge for any known solid-state UV laser material. When the pump beam was polarized perpendicular to the optical axis of the crystals, the gain and the laser efficiencies dropped by as much as an order of magnitude. The magnitude of pump-induced solarization was found to be highly variable for different crystals and to have an insignificant effect on the laser performance when favorable crystals were used. C1 LIGHTNING OPT CORP,TARPON SPRINGS,FL 34689. UNIV CENT FLORIDA,CTR RES & EDUC OPT & LASERS,ORLANDO,FL 32826. RP MARSHALL, CD (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 34 TC 202 Z9 205 U1 1 U2 32 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 OCT PY 1994 VL 11 IS 10 BP 2054 EP 2065 DI 10.1364/JOSAB.11.002054 PG 12 WC Optics SC Optics GA PL223 UT WOS:A1994PL22300019 ER PT J AU NEEMAN, M GIBEL, LJ SMITH, SM HARTFORD, A STERLING, W SILLERUD, LO AF NEEMAN, M GIBEL, LJ SMITH, SM HARTFORD, A STERLING, W SILLERUD, LO TI MAGNETIC-RESONANCE MICROSCOPY OF WATER DIFFUSION AND EDEMA DURING HYPOTHERMIC PRESERVATION OF RAT KIDNEYS SO JOURNAL OF UROLOGY LA English DT Article DE MAGNETIC RESONANCE IMAGING; KIDNEY TRANSPLANTATION; NUCLEAR MAGNETIC RESONANCE; ORGAN PRESERVATION ID TRANSPLANT DYSFUNCTION; REJECTION; US AB Kidney degradation during hypothermic storage was studied on rat kidneys, using magnetic resonance microscopy. Poor storage, modeled by storage with lactated Ringer's solution, resulted in rapid kidney swelling, together with increased signal intensity and water diffusion coefficient in the cortical and medullary regions. Storage of kidneys in Euro-Collins solution resulted in slower swelling and no significant change in signal intensity and in the water diffusion coefficient. Storage with Belzer's solution resulted in shrinkage of the kidneys and no significant change in the diffusion coefficient of water over time. These changes correlated well with kidney degradation observed by histology, and show the potential of magnetic resonance imaging in quality assessment of kidney transplants. C1 UNIV NEW MEXICO,DEPT UROL,ALBUQUERQUE,NM. TULANE UNIV,MED CTR,DEPT PATHOL,NEW ORLEANS,LA. LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM. RP NEEMAN, M (reprint author), WEIZMANN INST SCI,DEPT HORMONE RES,IL-76100 REHOVOT,ISRAEL. RI Neeman, Michal/A-8264-2008 OI Neeman, Michal/0000-0002-6296-816X NR 19 TC 1 Z9 1 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0022-5347 J9 J UROLOGY JI J. Urol. PD OCT PY 1994 VL 152 IS 4 BP 1287 EP 1291 PG 5 WC Urology & Nephrology SC Urology & Nephrology GA PF219 UT WOS:A1994PF21900083 PM 8072121 ER PT J AU SABINO, EC SHPAER, EG MORGADO, MG KORBER, BTM DIAZ, RS BONGERTZ, V CAVALCANTE, S GALVAOCASTRO, B MULLINS, JI MAYER, A AF SABINO, EC SHPAER, EG MORGADO, MG KORBER, BTM DIAZ, RS BONGERTZ, V CAVALCANTE, S GALVAOCASTRO, B MULLINS, JI MAYER, A TI IDENTIFICATION OF HUMAN-IMMUNODEFICIENCY-VIRUS TYPE-1 ENVELOPE GENES RECOMBINANT BETWEEN SUBTYPE-B AND SUBTYPE-F IN 2 EPIDEMIOLOGICALLY LINKED INDIVIDUALS FROM BRAZIL SO JOURNAL OF VIROLOGY LA English DT Article ID PRIMARY INFECTION; V3 REGION; SEQUENCES; INVIVO; HIV-1; CONFIDENCE; DIVERSITY; INVITRO; NUMBERS AB Sequence analysis of a human immunodeficiency virus type 1 env gene PCR amplified from a Brazilian woman's peripheral blood mononuclear cell DNA (sample RJIO1) showed that it was likely to have been derived from a double recombination event between human immunodeficiency virus type 1 subtypes B and P. The major portion of the gp120 coding sequence belonged to the B lineage, but a segment of the C2 to V3 region (approximately 135 nucleotides) clearly associated with sequences of the F lineage. The subtype F-like segment had 15 noncontiguous signature nucleotides in common with Brazilian subtype F sequences that were not found, or were rare, in subtype B sequences. In contrast, this same segment had only 3 signature nucleotides shared with subtype B sequences and not present in the Brazilian subtype F sequences. Phylogenetic analysis, amino acid signature pattern analysis, and the pattern of synonymous mutations all supported the hypothesis of a recombinational origin of the RJIO1 sequence. Related recombinant genes were also detected in peripheral blood mononuclear cell DNA obtained from the woman's recent sexual partner, indicating that the recombination event probably occurred at some previous time in the chain of virus transmission. Divergent viral sequences in the V3 region were found in the male sexual partner, while a relatively homogeneous viral population was detected in the woman, consistent with her recent infection. C1 IRWIN MEM BLOOD CTR,SAN FRANCISCO,CA 94118. STANFORD UNIV,SCH MED,DEPT MICROBIOL & IMMUNOL,STANFORD,CA 94305. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. SANTA FE INST,SANTA FE,NM 87501. INST ADOLFO LUTZ REGISTRO,RETROVIRUS LAB,BR-01246 SAO PAULO,BRAZIL. INST OSWALDO CRUZ,DEPT IMMUNOL,BR-21045 RIO JANEIRO,BRAZIL. INST OSWALDO CRUZ,HOSP EVANDRO CHAGAS,BR-21045 RIO JANEIRO,BRAZIL. ESCOLA PAULISTA MED,DIPA,BR-04023 SAO PAULO,BRAZIL. CTR PESQUISA GONCALO MONIZ,LAB AVANCADO SAUDE PUBL,BR-45945 FIOCRUZ,BA,BRAZIL. RI Sabino, Ester/F-7750-2010; Diaz, Ricardo/K-3978-2012; OI Sabino, Ester/0000-0003-2623-5126; Korber, Bette/0000-0002-2026-5757 FU NHLBI NIH HHS [R01-HL-48367] NR 34 TC 164 Z9 166 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0022-538X J9 J VIROL JI J. Virol. PD OCT PY 1994 VL 68 IS 10 BP 6340 EP 6346 PG 7 WC Virology SC Virology GA PG541 UT WOS:A1994PG54100023 PM 8083973 ER PT J AU KORBER, BTM MACINNES, K SMITH, RF MYERS, G AF KORBER, BTM MACINNES, K SMITH, RF MYERS, G TI MUTATIONAL TRENDS IN V3 LOOP PROTEIN SEQUENCES OBSERVED IN DIFFERENT GENETIC LINEAGES OF HUMAN-IMMUNODEFICIENCY-VIRUS TYPE-1 SO JOURNAL OF VIROLOGY LA English DT Article ID AMINO-ACID SUBSTITUTION; PRINCIPAL NEUTRALIZING DETERMINANT; CD4 BINDING-SITE; ENVELOPE PROTEIN; PHYLOGENETIC ANALYSIS; SURFACE GLYCOPROTEIN; SYNCYTIUM FORMATION; PRIMARY INFECTION; MEMBRANE-FUSION; VARIABLE DOMAIN AB Highly variable international human immunodeficiency virus type 1 envelope sequences can be assigned to six major clades, or phylogenetically defined subtypes, designated A through F. These subtypes are approximately equidistant in terms of evolutionary distance measured by nucleotide sequences. This radiation from a common ancestral sequence may have been in step with the spread of the pandemic. In this study, V3 loop protein sequence relationships within these major clades are analyzed to determine how the different lineages might be evolving with respect to this biologically important domain. The V3 loop has been shown to influence viral phenotype and to elicit both humoral and cellular immune responses. To identify patterns in V3 loop amino acid evolution, we cluster the sequences by a phenetic principle which evaluates protein similarities on the basis of amino acid identities and similarities irrespective of evolutionary relationships. When phenetic clustering patterns are superimposed upon phylogenetic subtype classifications, two interesting mutational trends are revealed. First, a set of identical, or highly similar, V3 loop protein sequences can be identified within two otherwise dissimilar genetic subtypes, A and C. Second, the D subtype sequences are found to possess the most radically divergent set of V3 loop sequences. These and other patterns characteristic of the V3 loop reflect the acquisition of specific biological properties during the apparently recent evolution of the human immunodeficiency virus type 1 lineages. C1 SANTA FE INST,SANTA FE,NM 87501. BAYLOR COLL MED,WM KECK CTR COMPUTAT BIOL,DEPT MOLEC HUMAN GENET,HOUSTON,TX 77030. BAYLOR COLL MED,WM KECK CTR COMPUTAT BIOL,DEPT CELL BIOL,HOUSTON,TX 77030. RP KORBER, BTM (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,MS K710,LOS ALAMOS,NM 87545, USA. OI Korber, Bette/0000-0002-2026-5757 FU NHGRI NIH HHS [1R01-HG00973-01, P30-HG00210]; NIAID NIH HHS [NIAID 3-Y01-A1-70001-11] NR 86 TC 117 Z9 118 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0022-538X J9 J VIROL JI J. Virol. PD OCT PY 1994 VL 68 IS 10 BP 6730 EP 6744 PG 15 WC Virology SC Virology GA PG541 UT WOS:A1994PG54100062 PM 8084005 ER PT J AU ALEXANDER, KA APPEL, MJG AF ALEXANDER, KA APPEL, MJG TI AFRICAN WILD DOGS (LYCAON-PICTUS) ENDANGERED BY A CANINE-DISTEMPER EPIZOOTIC AMONG DOMESTIC DOGS NEAR THE MASAI-MARA NATIONAL RESERVE, KENYA SO JOURNAL OF WILDLIFE DISEASES LA English DT Article DE AFRICAN WILD DOG; LYCAON PICTUS; DOMESTIC DOG; CANINE DISTEMPER; SEROLOGY; SURVEILLANCE ID BLACK-FOOTED FERRETS; VIRUS AB A longitudinal study of canine distemper (CD) among domestic dogs on Maasai communal land to the north of the Masai Mara National Reserve in Kenya was conducted from 1989 to 1991. Prevalence of antibodies to CD was very low among domestic dogs in 1989 and 1990 (4%, n = 49; and 1%, n = 119, respectively) and no African wild dogs (Lycaon pictus; n = 16) collected simultaneously from the same area had detectable antibodies. Among 51 domestic dogs sampled in 1991, however, prevalence of CD antibodies rose significantly (P < 0.01) to 76%. Disease-related mortality rates among domestic dogs were estimated from 1990 to 1992; they rose significantly (P < 0.01) from 21% in 1990 to 50% in 1991 and then decreased significantly (P < 0.01) to 38% in 1992. The 1992 mortality rate remained significantly (P < 0.01) higher than that of 1990. Signs observed in clinically ill domestic dogs were consistent with CD and included listlessness, decreased appetite, bilateral serous to mucopurulent oculonasal discharge, and diarrhea. No carcasses could be retrieved for virus isolation and postmortem examination. Concurrent with this CD epizootic in domestic dogs, the known African wild dog packs in this region disappeared. C1 CORNELL UNIV,COLL VET MED,JAMES A BAKER INST ANIM HLTH,ITHACA,NY 14853. RP ALEXANDER, KA (reprint author), LAWRENCE LIVERMORE NATL LAB,SCH VET MED,DEPT VET PATHOL MICROBIOL & IMMUNOL,DAVIS,CA 95616, USA. RI Alexander, Kathleen/A-9765-2010 OI Alexander, Kathleen/0000-0001-7338-5341 NR 25 TC 102 Z9 103 U1 1 U2 25 PU WILDLIFE DISEASE ASSN, INC PI LAWRENCE PA 810 EAST 10TH ST, LAWRENCE, KS 66044-8897 SN 0090-3558 J9 J WILDLIFE DIS JI J. Wildl. Dis. PD OCT PY 1994 VL 30 IS 4 BP 481 EP 485 PG 5 WC Veterinary Sciences SC Veterinary Sciences GA PR495 UT WOS:A1994PR49500001 PM 7760475 ER PT J AU ALEXANDER, KA KAT, PW WAYNE, RK FULLER, TK AF ALEXANDER, KA KAT, PW WAYNE, RK FULLER, TK TI SEROLOGIC SURVEY OF SELECTED CANINE PATHOGENS AMONG FREE-RANGING JACKALS IN KENYA SO JOURNAL OF WILDLIFE DISEASES LA English DT Article DE JACKAL; CANIS SPP; CANINE DISTEMPER VIRUS; CANINE PARVOVIRUS; RABIES; EHRLICHIA CANIS; SEROLOGIC SURVEY ID MICROBIAL PATHOGENS; PARVOVIRUS; DISTEMPER; ANTIBODY; VIRUS; RACCOON; WOLVES; FOX AB Serum samples from 76 free-ranging adult jackals of three species from four localities in Kenya were examined for circulating antibodies against four canine pathogens: rabies virus, canine parvovirus (CPV-2), canine distemper virus (CDV), and Ehrlichia can is. Samples were collected between April 1987 and January 1988. Among black-backed jackals (Canis mesomelas), the most sampled species, the mean prevalence of antibodies to CPV-2, CDV, rabies virus, and E. canis was 34% (14 positive/55 sampled), 9% (4/55), 3% (1/28), and 2% (1/36), respectively. There were no significant differences among sampling locations. In one area, antibody prevalence of CPV-2 was significantly higher for golden jackals (C. aureus; 9/16) than for C. mesomelas (5/26). Only three side-striped jackals (C. adustus) were sampled, but antibodies to CPV-2 and CDV were present. As jackals often are the most abundant wild carnivore in African ecosystems, they could serve as an important indicator species to monitor the potential of exposure of rare and endangered canids to specific canine diseases. C1 WILDLIFE CONCERN INT,WINDERMERE,FL 34786. UNIV CALIF LOS ANGELES,DEPT BIOL,LOS ANGELES,CA 90024. UNIV MASSACHUSETTS,DEPT FORESTRY & WILDLIFE MANAGEMENT,AMHERST,MA 01003. RP ALEXANDER, KA (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT VET PATHOL MICROBIOL & IMMUNOL,DAVIS,CA 95616, USA. RI Alexander, Kathleen/A-9765-2010 OI Alexander, Kathleen/0000-0001-7338-5341 NR 40 TC 41 Z9 41 U1 1 U2 7 PU WILDLIFE DISEASE ASSN, INC PI LAWRENCE PA 810 EAST 10TH ST, LAWRENCE, KS 66044-8897 SN 0090-3558 J9 J WILDLIFE DIS JI J. Wildl. Dis. PD OCT PY 1994 VL 30 IS 4 BP 486 EP 491 PG 6 WC Veterinary Sciences SC Veterinary Sciences GA PR495 UT WOS:A1994PR49500002 PM 7760476 ER PT J AU ELLSWORTH, DL HONEYCUTT, RL SILVY, NJ SMITH, MH BICKHAM, JW KLIMSTRA, WD AF ELLSWORTH, DL HONEYCUTT, RL SILVY, NJ SMITH, MH BICKHAM, JW KLIMSTRA, WD TI WHITE-TAILED DEER RESTORATION TO THE SOUTHEASTERN UNITED-STATES - EVALUATING GENETIC-VARIATION SO JOURNAL OF WILDLIFE MANAGEMENT LA English DT Article DE ALLOZYMES; GENETICS; HUNTING; MANAGEMENT; MITOCHONDRIAL DNA; ODOCOILEUS-VIRGINIANUS; RESTOCKING; SOUTHEASTERN UNITED-STATES; WHITE-TAILED DEER ID MITOCHONDRIAL-DNA; RESTRICTION ENDONUCLEASES; SPATIAL HETEROGENEITY; NATURAL-POPULATIONS; MULE DEER; DIFFERENTIATION; VARIABILITY; DISPERSAL AB Protective legislation and restocking were used to restore white-tailed deer (Odocoileus virginianus) to the southeastern United States (U.S.) following declines that occurred during the nineteenth century. Although stocking and protection of native herds are often key components of deer management programs, the degree to which these strategies contributed to recovery of southeastern white-tailed deer has not been determined. We used mitochondrial DNA (mtDNA) restriction-site variation and allozyme diversity to characterize gene flow patterns and genetic differentiation among white-tailed deer populations in the southeastern U.S. and evaluated the effectiveness of management programs for restoring white-tailed deer to the region. Compared with white-tailed deer in northern areas of North America, deer in the southeastern U.S. exhibited a high level of mtDNA subdivision (G(ST) = 0.621) that may be attributable to site philopatry of females. Relative to mtDNA, the extent of allozyme differentiation (F(ST) = 0.153) indicated a bias in dispersal (gene flow) toward males (3:1), suggesting that managers should regulate the degree to which males are preferentially harvested to preserve the exchange of genetic information among populations. Geographic patterns of genetic variation in white-tailed deer were congruent with those in unrelated taxa, implicating the common influence of historical biogeographic events in shaping contemporary genetic structure. Similarities in geographic variation between white-tailed deer and other vertebrates inhabiting this region indicated that deer populations in the southeastern U.S. are descended from native herds and that relocated deer have contributed insignificantly to the genetic composition of extant populations. C1 TEXAS A&M UNIV,DEPT WILDLIFE & FISHERIES SCI,COLLEGE STN,TX 77843. SO ILLINOIS UNIV,COOPERAT WILDLIFE RES LAB,CARBONDALE,IL 62901. SAVANNAH RIVER ECOL LAB,AIKEN,SC 29801. NR 56 TC 24 Z9 25 U1 1 U2 8 PU WILDLIFE SOC PI BETHESDA PA 5410 GROSVENOR LANE, BETHESDA, MD 20814-2197 SN 0022-541X J9 J WILDLIFE MANAGE JI J. Wildl. Manage. PD OCT PY 1994 VL 58 IS 4 BP 686 EP 697 DI 10.2307/3809683 PG 12 WC Ecology; Zoology SC Environmental Sciences & Ecology; Zoology GA PL727 UT WOS:A1994PL72700013 ER PT J AU LEBERG, PL STANGEL, PW HILLESTAD, HO MARCHINTON, RL SMITH, MH AF LEBERG, PL STANGEL, PW HILLESTAD, HO MARCHINTON, RL SMITH, MH TI GENETIC-STRUCTURE OF REINTRODUCED WILD TURKEY AND WHITE-TAILED DEER POPULATIONS SO JOURNAL OF WILDLIFE MANAGEMENT LA English DT Article DE ALLOZYME ELECTROPHORESIS; GENETIC VARIABILITY; MELEAGRIS-GALLOPAVO; ODOCOILEUS-VIRGINIANUS; REINTRODUCTIONS; WHITE-TAILED DEER; WILD TURKEY ID VARIABILITY; CONSERVATION; BOTTLENECKS; MANAGEMENT; DIVERSITY; DISTANCE AB Although reintroductions are an important management tool, little is known about their effects on the genetic structure of wildlife species. We studied wild turkey (Meleagris gallopavo) and white-tailed deer (Odocoileus virginianus) populations from the eastern United States to determine if the genetic similarity of populations was more affected by geographic proximity or by possible gene flow resulting from reintroduction programs. We examined allele frequencies at 5 polymorphic loci for turkeys from 22 locations and at 15 polymorphic loci for deer from 21 locations and compared genetic distances among populations for both species to geographic distances and reintroduction histories. For both species, genetic distances were smaller between pairs of populations that either had individuals transferred between them or that had both received individuals from a common source population than were distances between pairs of populations that had not been connected by reintroductions (P < 0.001). Geographic proximity of populations of both turkeys and deer was not associated with genetic similarity (P = 0.280 and 0.520, respectively). Reintroductions may have obscured genetic patterns resulting from other evolutionary processes such as gene flow through dispersal. Additionally, post-reintroduction dispersal has not erased the genetic contributions of reintroduced individuals to the populations they established. Reintroduction programs should attempt to create populations with high levels of genetic diversity and avoid unnecessary disruption of the evolutionary relationships among populations of a species. C1 NATL FISH & WILDLIFE FDN,WASHINGTON,DC 20036. UNIV GEORGIA,SCH FOREST RESOURCES,ATHENS,GA 30602. SAVANNAH RIVER ECOL LAB,AIKEN,SC 29801. RP LEBERG, PL (reprint author), UNIV SW LOUISIANA,DEPT BIOL,LAFAYETTE,LA 70504, USA. NR 39 TC 37 Z9 38 U1 1 U2 9 PU WILDLIFE SOC PI BETHESDA PA 5410 GROSVENOR LANE, BETHESDA, MD 20814-2197 SN 0022-541X J9 J WILDLIFE MANAGE JI J. Wildl. Manage. PD OCT PY 1994 VL 58 IS 4 BP 698 EP 711 DI 10.2307/3809684 PG 14 WC Ecology; Zoology SC Environmental Sciences & Ecology; Zoology GA PL727 UT WOS:A1994PL72700014 ER PT J AU EISELE, PH KAAEKUAHIWI, MA CANFIELD, DR GOLUB, MS EISELE, JH AF EISELE, PH KAAEKUAHIWI, MA CANFIELD, DR GOLUB, MS EISELE, JH TI EPIDURAL CATHETER PLACEMENT FOR TESTING OF OBSTETRICAL ANALGESICS IN FEMALE GUINEA-PIGS SO LABORATORY ANIMAL SCIENCE LA English DT Article ID THERMAL PAIN; BUPIVACAINE; DEXMEDETOMIDINE; EFFICACY AB The pregnant guinea pig may be a useful model for the study of drug effects in the newborn. A reliable technique for epidural catheterization in the guinea pig was developed to allow use of this model to evaluate the effects of epidural labor analgesics on neonates. Catheters were implanted in two open pilot animals and 19 time-dated pregnant animals on days 59 to 62 of gestation. After establishing a surgical plane of isoflurane-induced anesthesia, an incision was made over the dorsal lumbar part of the spine. The L3-4 intervertebral space was exposed to allow introduction of a caudally directed 27-gauge catheter into the epidural space. The catheter was capped and implanted subcutaneously, then the animal was allowed to recover from anesthesia. Catheter placement was evaluated, using a bupivacaine test dose in 17 animals and postmortem histologic examination in 20 animals. One animal died immediately after surgery. Epidural placement was confirmed histologically in 15 of 20 animals. Failed catheters were either subdural, with one catheter found to be penetrating the spinal cord (intraspinal), or intramuscular. Response to epidurally administered bupivacaine was variable but was typically characterized by normal. alertness and ability to use the forelimbs; depression of the panniculus reflex in the dorsal lumbar region; and hind limb motor impairment, with ataxia, loss of the placing reflex, and a tendency to drag the hind limbs. Subdural placement was associated with CNS depression, recumbency, shallow breathing, and sensory block ascending to the level of the ears. Administration of the test dose was fatal in the one animal that had intraspinal catheter placement. Using the afore-described technique, epidural catheterization can be performed reliably in the guinea pig. Correct catheter placement can be confirmed by use of an antemortem test dose of local anesthetic and by postmortem histologic examination. C1 LAWRENCE LIVERMORE NATL LAB,CALIF REG PRIMATE RES CTR,DAVIS,CA 95616. LAWRENCE LIVERMORE NATL LAB,SCH MED,DEPT ANESTHESIOL,DAVIS,CA 95616. RP EISELE, PH (reprint author), LAWRENCE LIVERMORE NATL LAB,SCH VET MED,ANIM RESOURCES SERV,DAVIS,CA 95616, USA. FU NIGMS NIH HHS [GM32920] NR 11 TC 9 Z9 10 U1 0 U2 3 PU AMER ASSOC LABORATORY ANIMAL SCIENCE PI CORDOVA PA 70 TIMBERCREEK DR, SUITE 5, CORDOVA, TN 38018 SN 0023-6764 J9 LAB ANIM SCI JI Lab. Anim. Sci. PD OCT PY 1994 VL 44 IS 5 BP 486 EP 490 PG 5 WC Veterinary Sciences; Zoology SC Veterinary Sciences; Zoology GA PP079 UT WOS:A1994PP07900011 PM 7844958 ER PT J AU KOCK, M THOMPSON, E VULLIET, PR BROOKS, DL AF KOCK, M THOMPSON, E VULLIET, PR BROOKS, DL TI PHARMACOKINETIC PROPERTIES OF METHADONE HYDROCHLORIDE AFTER SINGLE INTRAMUSCULAR ADMINISTRATION IN ADULT DAIRY GOATS SO LABORATORY ANIMAL SCIENCE LA English DT Article ID 3-METHYLCHOLANTHRENE TREATMENT; METABOLITE FORMATION; ANTIPYRINE; PLASMA; CATTLE; RATS; DISPOSITION; SHEEP; XENOBIOTICS; TISSUES AB Pharmacokinetic parameters of methadone were studied in adult dairy goats. Five goats were each given methadone hydrochloride as a single 0.2 mg/kg of body weight dosage by intramuscular (IM) administration. Plasma methadone concentrations were determined for 96 h after dosing. Plasma methadone concentrations after IM administration were best described by an open one-compartment model. Overall elimination half-life (t(1/2)) was 1.38 h. Peak plasma concentrations were reached 0.25 h after dosing, and the actual plasma concentration averaged 37.8 ng/ml (SD = 12.76) at that time. The data obtained hom this study suggest that plasma concentrations, similar to those that are analgesic in humans, can be achieved after IM administration of methadone at a dose rate of 0.2 mg/kg of body weight. In addition, these plasma concentrations can be maintained for up to 3 h after a single injection and, therefore, may provide satisfactory analgesia for such period, C1 LAWRENCE LIVERMORE NATL LAB,SCH VET MED,DEPT MOLEC BIOSCI,DAVIS,CA 95616. LAWRENCE LIVERMORE NATL LAB,VET MED TEACHING HOSP,SCH VET MED,DEPT CLIN PATHOL,DAVIS,CA 95616. RP KOCK, M (reprint author), LAWRENCE LIVERMORE NATL LAB,SCH VET MED,ANIM RESOURCES SERV,DAVIS,CA 95616, USA. NR 42 TC 3 Z9 3 U1 1 U2 4 PU AMER ASSOC LABORATORY ANIMAL SCIENCE PI CORDOVA PA 70 TIMBERCREEK DR, SUITE 5, CORDOVA, TN 38018 SN 0023-6764 J9 LAB ANIM SCI JI Lab. Anim. Sci. PD OCT PY 1994 VL 44 IS 5 BP 503 EP 507 PG 5 WC Veterinary Sciences; Zoology SC Veterinary Sciences; Zoology GA PP079 UT WOS:A1994PP07900014 PM 7844961 ER PT J AU HICKMAN, MA REUBEL, GH HOFFMAN, DE MORRIS, JG ROGERS, QR PEDERSEN, NC AF HICKMAN, MA REUBEL, GH HOFFMAN, DE MORRIS, JG ROGERS, QR PEDERSEN, NC TI AN EPIZOOTIC OF FELINE HERPESVIRUS, TYPE-1 IN A LARGE SPECIFIC PATHOGEN-FREE CAT COLONY AND ATTEMPTS TO ERADICATE THE INFECTION BY IDENTIFICATION AND CULLING OF CARRIERS SO LABORATORY ANIMALS LA English DT Article DE FELINE HERPESVIRUS TYPE 1; LATENT INFECTION; CORTICOSTEROIDS; CATS ID VIRAL RHINOTRACHEITIS AB This study describes the clinical course of an inadvertent feline herpesvirus, type 1 (FHV-1) outbreak in 2 specific pathogen-free (SPF) research and breeding colonies housing 690 cats and assesses a programme that was designed to eradicate the virus from the colonies. The clinical signs observed in these cats were milder, with more eye involvement than those previously described for FHV-1 infection and did not include abortion. FHV-1 eradication was based on the detection and elimination of both active and latent viral carriers. Carrier cats were detected by virus isolation from oral swabs before and after corticosteroid-induced reactivation of FHV-1 excretion. Four per cent of recovered cats were actively shedding virus prior to corticosteroid treatment; 21% of the virus negative cats shed virus after one corticosteroid injection, and 12% of remaining culture negative cats tested positive upon a second corticosteroid treatment 6 weeks later. The colony remained virus free for 8 months after all detectable virus carriers were culled and there was no seroconversion among new kittens. A second epizootic of FHV-1 then occurred among susceptible animals. At this time, all breeding cats that had tested negative after 2 injections of corticosteroids were treated a third time; 23% of them now tested positive for FHV-1. This study demonstrates that corticosteroid treatment can be useful in improving the rate of detection, essential as a basis for decreasing the incidence of enzootic disease, but it is unlikely to detect all possible FHV-1 carriers in large populations of cats. C1 LAWRENCE LIVERMORE NATL LAB,SCH VET MED,DEPT MED,DAVIS,CA 95616. RP HICKMAN, MA (reprint author), LAWRENCE LIVERMORE NATL LAB,SCH VET MED,DEPT MOLEC BIOSCI,DAVIS,CA 95616, USA. NR 13 TC 26 Z9 27 U1 0 U2 1 PU ROYAL SOC MEDICINE SERVICES LTD PI LONDON PA 1 WIMPOLE STREET, LONDON, ENGLAND W1M 8AE SN 0023-6772 J9 LAB ANIM JI Lab. Anim. PD OCT PY 1994 VL 28 IS 4 BP 320 EP 329 DI 10.1258/002367794780745038 PG 10 WC Veterinary Sciences; Zoology SC Veterinary Sciences; Zoology GA PM095 UT WOS:A1994PM09500004 PM 7830371 ER PT J AU ALBER, MS CAMASSA, R HOLM, DD MARSDEN, JE AF ALBER, MS CAMASSA, R HOLM, DD MARSDEN, JE TI THE GEOMETRY OF PEAKED SOLITONS AND BILLIARD SOLUTIONS OF A CLASS OF INTEGRABLE PDES SO LETTERS IN MATHEMATICAL PHYSICS LA English DT Article ID SCHRODINGER-EQUATIONS; HAMILTONIAN-FORMALISM; WATER AB The purpose of this Letter is to investigate the geometry of new classes of soliton-like solutions for integrable nonlinear equations. One example is the class of peakons introduced by Camassa and Holm [10] for a shallow water equation. We put this equation in the framework of complex integrable Hamiltonian systems on Riemann surfaces and draw some consequences from this setting. Amongst these consequences, one obtains new solutions such as quasiperiodic solutions, n-solitons, solitons with quasiperiodic background, billiard, and n-peakon solutions and complex angle representations for them. Also, explicit formulas for phase shifts of interacting soliton solutions are obtained using the method of asymptotic reduction of the corresponding angle representations. The method we use for the shallow water equation also leads to a link between one of the members of the Dym hierarchy and geodesic flow on N-dimensional quadrics. Other topics, planned for a forthcoming paper, are outlined. C1 UNIV NOTRE DAME,DEPT MATH,NOTRE DAME,IN 46556. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV NOTRE DAME,DIV THEORET,NOTRE DAME,IN 46556. UNIV CALIF BERKELEY,DEPT MATH,BERKELEY,CA 94720. RP ALBER, MS (reprint author), INST ADV STUDY,SCH MATH,PRINCETON,IN 46556, USA. OI Holm, Darryl D/0000-0001-6362-9912 NR 25 TC 120 Z9 125 U1 0 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0377-9017 J9 LETT MATH PHYS JI Lett. Math. Phys. PD OCT PY 1994 VL 32 IS 2 BP 137 EP 151 DI 10.1007/BF00739423 PG 15 WC Physics, Mathematical SC Physics GA PK576 UT WOS:A1994PK57600005 ER PT J AU GIBBS, P BLACKBAND, SJ OCONNOR, B SCHOENIGER, JS CHAKRABARTI, I BUCKLEY, DL HORSMAN, A AF GIBBS, P BLACKBAND, SJ OCONNOR, B SCHOENIGER, JS CHAKRABARTI, I BUCKLEY, DL HORSMAN, A TI 3D MRI and angiography of human extremities using a local gradient coil SO MAGNETIC RESONANCE MATERIALS IN PHYSICS BIOLOGY AND MEDICINE LA English DT Proceedings Paper CT 1st Nottingham Symposium on Magnetic Resonance Imaging CY 1994 CL NOTTINGHAM, ENGLAND DE ANGIOGRAPHY; FINGER; HIGH RESOLUTION AB The limits of the spatial resolution achievable on a standard GE Signa 1.5-T imaging machine have been explored by interfacing a 12-cm-diameter local gradient set to such a system. Using a range of purpose-built radio-frequency (RF) coils, 3D gradient echo images with a spatial resolution of 100 x 100 x 500 mu have been routinely obtained on the finger. Also produced were 100 x 200 x 500 mu resolution angiograms of the finger detailing submillimeter vessels, with a velocity encoding of 6 cm s(-1). High-resolution fat/water suppressed images and isotropic data sets with a resolution of 170 mu are also demonstrated. With regard to the investigation of the mechanics of the human finger, isotropic data sets are desirable if accurate segmentation is to be implemented. A preliminary study illustrating the potential for producing a magnetic-resonance-based computer simulation of the mechanics of the human finger shows the distal interphalangeal joint extended and then in flexion. C1 HULL ROYAL INFIRM,CTR MR INVEST,KINGSTON HULL,N HUMBERSIDE,ENGLAND. UNIV HULL,DEPT APPL PHYS,KINGSTON HULL HU6 7RX,N HUMBERSIDE,ENGLAND. SANDIA NATL LABS,CTR COMPUTAT ENGN,LIVERMORE,CA. UNIV NEWCASTLE UPON TYNE,DEPT ORTHOPAED,NEWCASTLE TYNE,TYNE & WEAR,ENGLAND. NR 5 TC 1 Z9 1 U1 1 U2 1 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 1352-8661 J9 MAGN RESON MATER PHY JI Magn. Reson. Mat. Phys. Biol. Med. PD OCT PY 1994 VL 2 IS 3 BP 461 EP 465 DI 10.1007/BF01705298 PG 5 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA QB906 UT WOS:A1994QB90600067 ER PT J AU BLAIR, PJ CARPENTER, DA GODFREY, VL RUSSELL, LB WILKINSON, JE RINCHIK, EM AF BLAIR, PJ CARPENTER, DA GODFREY, VL RUSSELL, LB WILKINSON, JE RINCHIK, EM TI THE MOUSE SCURFY (SF) MUTATION IS TIGHTLY LINKED TO GATA1 AND TFE3 ON THE PROXIMAL X-CHROMOSOME SO MAMMALIAN GENOME LA English DT Note ID WISKOTT-ALDRICH SYNDROME; LYMPHORETICULAR DISEASE; FRAGMENTS; MUTANT; GENE; MAP C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. UNIV TENNESSEE,COLL VET MED,KNOXVILLE,TN 37901. RP BLAIR, PJ (reprint author), UNIV TENNESSEE,OAK RIDGE GRAD PROGRAM BIOMED SCI,OAK RIDGE,TN 37831, USA. NR 16 TC 22 Z9 24 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0938-8990 J9 MAMM GENOME JI Mamm. Genome PD OCT PY 1994 VL 5 IS 10 BP 652 EP 654 DI 10.1007/BF00411464 PG 3 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Genetics & Heredity SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Genetics & Heredity GA PL429 UT WOS:A1994PL42900012 PM 7849405 ER PT J AU SCHIFFMAN, R DEAN, A CHANEY, RC SUCHANEK, J VEGA, B MCFARLAND, T SCHULTHEISS, PJ GUNN, D KELLER, GH NOORANY, I FAGHIHI, M SHEPHARD, L LIPKIN, J KINKER, J BRYANT, WR TAYLOR, E JOHNS, M SILVA, AJ LEVY, WP SICILIANO, R DADEY, K OLSEN, H AF SCHIFFMAN, R DEAN, A CHANEY, RC SUCHANEK, J VEGA, B MCFARLAND, T SCHULTHEISS, PJ GUNN, D KELLER, GH NOORANY, I FAGHIHI, M SHEPHARD, L LIPKIN, J KINKER, J BRYANT, WR TAYLOR, E JOHNS, M SILVA, AJ LEVY, WP SICILIANO, R DADEY, K OLSEN, H TI GEOTECHNICAL PROPERTIES OF NORTHWEST PACIFIC PELAGIC CLAYS - DEEP-SEA DRILLING PROJECT LEG-86, HOLE-576A (REPRINTED FROM INITIAL REPORTS OF THE DEEP SEA DRILLING PROJECT, VOL 86, 1985) SO MARINE GEORESOURCES & GEOTECHNOLOGY LA English DT Reprint AB Geotechnical property results from Deep Sea Drilling Project Hole 576A sediments represent the most complete data set ever compiled for a continuously depositional! sedimentary section that spans 65 m.y. Geotechnical analyses included index-property and sediment characterization, and consolidation, permeability, and triaxial testing. Excellent agreement exists between test data generated in this multilaboratory effort. Sediment characterization and index-property data delineate three well-defined units that conform with major lithologic divisions. Within Subunit IA these data appear inconsistent with accepted geotechnical relationships, showing water content, plasticity, and grain size increasing over similar intervals. These unusual relationships are attributed in part, to silt-sized bonded clay aggregates. Within Subunit IB geotechnical properties become more uniform, and a marked increase in X-ray amorphous material occurs below 28 m sub-bottom. A pronounced change in the geotechnical behavior of Hole 576A sediments occurs in Unit II and corresponds to the presence of calcareous oozes. Consolidation test results show overconsolidated sediments in the upper 28 m and normally consolidated sediments between 28 and 55 m sub-bottom. Mechanisms to explain the state of overconsolidation that are consistent with the geological history of the area include cementation and interparticle bonding, the release of high hydrostatic pressures during core recovery, and artifacts resulting from the consolidation test process. Additionally, the relevance of the preconsolidation stress determined using consolidation test results may be limited. C1 HUMBOLT STATE UNIV,ARCATA,CA. INST OCEANOG SCI,GODALMING GU8 5UB,SURREY,ENGLAND. OREGON STATE UNIV,CORVALLIS,OR. SAN DIEGO UNIV,SAN DIEGO,CA. SANDIA NATL LAB,ALBUQUERQUE,NM. TEXAS A&M UNIV,COLLEGE STN,TX. UNIV RHODE ISL,NARRAGANSETT,RI. US GEOL SURVEY,DENVER,CO. RP SCHIFFMAN, R (reprint author), UNIV COLORADO,BOULDER,CO 80302, USA. NR 38 TC 0 Z9 0 U1 0 U2 1 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 1064-119X J9 MAR GEORESOUR GEOTEC JI Mar. Geores. Geotechnol. PD OCT-DEC PY 1994 VL 12 IS 4 BP 341 EP 404 PG 64 WC Engineering, Ocean; Engineering, Geological; Oceanography; Mining & Mineral Processing SC Engineering; Oceanography; Mining & Mineral Processing GA RE453 UT WOS:A1994RE45300004 ER PT J AU LI, YF SHENG, ZZ CHEN, N AF LI, YF SHENG, ZZ CHEN, N TI LIQUID-PHASE ASSISTED SYNTHESIS OF SINGLE THALLIUM LAYER SUPERCONDUCTORS SO MATERIALS RESEARCH BULLETIN LA English DT Article DE OXIDE; THALLIUM; CUPRATE; SUPERCONDUCTOR ID CU-O SUPERCONDUCTORS; BULK SUPERCONDUCTIVITY; TL; FILMS; SYSTEM; 120-K; VAPOR; TAPE; TC AB TlBa2Ca2Cu3Ox (Tl-1223) powder was synthesized in O2 from a mixture of Tl2O3 and Ba2Ca2Cu3Ox. The peritectic melting point of TI-1223 in O2 is 905-degrees-C. It was found that the maximum phase conversion to the Tl-1223 phase occurred at 895-900-degrees-C. A small concentration of liquid was present at that temperature. Because of the rapid kinetics of Tl-1223 formation, CaO and BaCuO2 phases became isolated from the Tl2O3 and thus remained in the final microstructure. In samples heated at 895-degrees-C, the CaO and BaCuO2 proved to be sufficiently small to act as flux-pinning sites. C1 ILLINOIS SUPERCOND CORP,EVANSTON,IL 60201. ARGONNE NATL LAB,ARGONNE,IL 60439. RP LI, YF (reprint author), UNIV ARKANSAS,DEPT PHYS,FAYETTEVILLE,AR 72701, USA. NR 30 TC 9 Z9 9 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0025-5408 J9 MATER RES BULL JI Mater. Res. Bull. PD OCT PY 1994 VL 29 IS 10 BP 1057 EP 1064 DI 10.1016/0025-5408(94)90087-6 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA PG846 UT WOS:A1994PG84600007 ER PT J AU MATSINOS, YG DEANGELIS, DL WOLFF, WF AF MATSINOS, YG DEANGELIS, DL WOLFF, WF TI USING AN OBJECT-ORIENTED MODEL FOR ECOLOGICAL RISK ASSESSMENT ON A GREAT BLUE HERON COLONY SO MATHEMATICAL AND COMPUTER MODELLING LA English DT Article DE AVIAN TOXICOLOGY; INDIVIDUAL-ORIENTED MODELS; ENVIRONMENTAL RISK ASSESSMENT AB The contribution of certain contaminants to reproductive failure in many avian species has been an ongoing concern. We used the individual-oriented approach in an effort to quantify effects of chronic contaminant exposure on small groups of interacting individual birds rather than the population as a whole. This was made possible by the use of an object-oriented model, where individual birds are interacting objects, and their actions are implemented by passing to them appropriate messages. Using this modeling approach, a breeding colony of Great Blue Herons (Ardea herodias) is simulated as an assemblage of interacting individuals whose daily actions (foraging, growth, feeding of the young) are simultaneously followed over short time intervals for a nesting season. Spatial distribution of the contaminants in prey resources is used on a cell by cell basis, and their effects on certain behavior characteristics of adult birds (e.g., foraging efficiency, effects on flying efficiency, parental care) are taken into account. Results show that sublethal effects can have a considerable effect on colony success. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. FORSCHUNGSZENTRUM JUELICH,INST BIOTECHNOL 3,D-52425 JULICH,GERMANY. RP MATSINOS, YG (reprint author), UNIV TENNESSEE,GRAD PROGRAM ECOL,KNOXVILLE,TN 37996, USA. NR 15 TC 3 Z9 3 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0895-7177 J9 MATH COMPUT MODEL JI Math. Comput. Model. PD OCT PY 1994 VL 20 IS 8 BP 75 EP 82 DI 10.1016/0895-7177(94)90232-1 PG 8 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA PT136 UT WOS:A1994PT13600007 ER PT J AU BRAMBLE, JH LEYK, Z PASCIAK, JE AF BRAMBLE, JH LEYK, Z PASCIAK, JE TI THE ANALYSIS OF MULTIGRID ALGORITHMS FOR PSEUDODIFFERENTIAL-OPERATORS OF ORDER MINUS ONE SO MATHEMATICS OF COMPUTATION LA English DT Article ID V-CYCLE; CONVERGENCE; EQUATIONS AB Multigrid algorithms are developed to solve the discrete systems approximating the solutions of operator equations involving pseudodifferential operators of order minus one. Classical multigrid theory deals with the case of differential operators of positive order. The pseudodifferential operator gives rise to a coercive form on H--1/2(Omega). Effective multigrid algorithms are developed for this problem. These algorithms are novel in that they use the inner product on H-1(Omega) as a base inner product for the multigrid development. We show that the resulting rate of iterative convergence can, at worst, depend linearly on the number of levels in these novel multigrid algorithms. In addition, it is shown that the convergence rate is independent of the number of levels (and unknowns) in the case of a pseudodifferential operator defined by a single-layer potential. Finally, the results of numerical experiments illustrating the theory are presented. C1 AUSTRALIAN NATL UNIV, STAT RES SECT, CANBERRA, ACT 2601, AUSTRALIA. BROOKHAVEN NATL LAB, DEPT APPL SCI, UPTON, NY 11973 USA. RP CORNELL UNIV, DEPT MATH, WHITE HALL, ITHACA, NY 14853 USA. NR 19 TC 28 Z9 28 U1 0 U2 0 PU AMER MATHEMATICAL SOC PI PROVIDENCE PA 201 CHARLES ST, PROVIDENCE, RI 02940-2213 USA SN 0025-5718 EI 1088-6842 J9 MATH COMPUT JI Math. Comput. PD OCT PY 1994 VL 63 IS 208 BP 461 EP 478 DI 10.2307/2153279 PG 18 WC Mathematics, Applied SC Mathematics GA PP941 UT WOS:A1994PP94100002 ER PT J AU LYNESS, JN AF LYNESS, JN TI QUADRATURE OVER CURVED SURFACES BY EXTRAPOLATION SO MATHEMATICS OF COMPUTATION LA English DT Article DE CUBATURE; CURVILINEAR TRIANGLE; EULER-MACLAURIN EXPANSION; EXTRAPOLATION; ROMBERG INTEGRATION ID BOUNDARY ELEMENT METHODS; INTEGRALS AB In this paper we describe and justify a method for integrating over curved surfaces. This method does not require that the Jacobian be known explicitly. This is a natural extension of extrapolation (or Romberg integration) for planar squares or triangles. RP LYNESS, JN (reprint author), ARGONNE NATL LAB,DIV MAT & COMP SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 10 TC 4 Z9 4 U1 1 U2 2 PU AMER MATHEMATICAL SOC PI PROVIDENCE PA 201 CHARLES ST, PROVIDENCE, RI 02940-2213 SN 0025-5718 J9 MATH COMPUT JI Math. Comput. PD OCT PY 1994 VL 63 IS 208 BP 727 EP 740 DI 10.2307/2153292 PG 14 WC Mathematics, Applied SC Mathematics GA PP941 UT WOS:A1994PP94100015 ER PT J AU YORK, A AF YORK, A TI IN SUPPORT OF THE LABS SO MECHANICAL ENGINEERING LA English DT Letter RP YORK, A (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0025-6501 J9 MECH ENG JI Mech. Eng. PD OCT PY 1994 VL 116 IS 10 BP 8 EP 8 PG 1 WC Engineering, Mechanical SC Engineering GA PL503 UT WOS:A1994PL50300006 ER PT J AU LIU, HYB BRUGGER, RM RORER, DC TICHLER, PR HU, JP AF LIU, HYB BRUGGER, RM RORER, DC TICHLER, PR HU, JP TI DESIGN OF A HIGH-FLUX EPITHERMAL NEUTRON BEAM USING THE U-235 FISSION PLATES AT THE BROOKHAVEN MEDICAL-RESEARCH REACTOR SO MEDICAL PHYSICS LA English DT Article DE BORON NEUTRON CAPTURE THERAPY; EPITHERMAL NEUTRON BEAM; U-235 FISSION PLATE; MONTE CARLO SIMULATIONS ID CAPTURE THERAPY AB Beams of epithermal neutrons are being used in the development of boron neutron capture therapy for cancer. This report describes a design study in which U-235 fission plates and moderators are used to produce an epithermal neutron beam with higher intensity and better quality than the beam currently in use at the Brookhaven Medical Research Reactor (BMRR). Monte Carlo calculations are used to predict the neutron and gamma fluxes and absorbed doses produced by the proposed design. Neutron flux measurements at the present epithermal treatment facility (ETF) were made to verify and compare with the computed results where feasible. The calculations indicate that an epithermal neutron beam produced by a fission-plate converter could have an epithermal neutron intensity of 1.2X10(10) n/cm(2).s and a fast neutron dose per epithermal neutron of 2.8X10(-11) cGy.cm(2)/n(epi) plus being forward directed. This beam would be built into the beam shutter of the ETF at the BMRR. The feasibility of remodeling the facility is discussed. C1 BROOKHAVEN NATL LAB,DIV REACTOR,UPTON,NY 11973. RP LIU, HYB (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. NR 11 TC 14 Z9 14 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0094-2405 J9 MED PHYS JI Med. Phys. PD OCT PY 1994 VL 21 IS 10 BP 1627 EP 1631 DI 10.1118/1.597268 PG 5 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA PM759 UT WOS:A1994PM75900013 PM 7869995 ER PT J AU COTTON, JD NOEBE, RD AF COTTON, JD NOEBE, RD TI DISCUSSION OF THE ROLE OF MICROSTRUCTURE ON STRENGTH AND DUCTILITY OF HOT-EXTRUDED MECHANICALLY ALLOYED NIAL SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Note ID DEFORMATION MECHANISMS; TEMPERATURE; TENSILE; SLIP; TEXTURE C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. RP COTTON, JD (reprint author), LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545, USA. NR 21 TC 0 Z9 0 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD OCT PY 1994 VL 25 IS 10 BP 2303 EP 2304 DI 10.1007/BF02652330 PG 2 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PH400 UT WOS:A1994PH40000023 ER PT J AU DEERCY, P AF DEERCY, P TI SANDIAS PEERCY ON CFM, CVD, AND LOW-HANGING FRUIT SO MICROCONTAMINATION LA English DT Editorial Material RP DEERCY, P (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU CANON COMMUNICATIONS INC PI SANTA MONICA PA 3340 OCEAN PARK BLVD, SUITE 1000, SANTA MONICA, CA 90405 SN 0738-713X J9 MICROCONTAMINATION JI Microcontamination PD OCT PY 1994 VL 12 IS 10 BP 12 EP & PG 0 WC Engineering, Chemical; Engineering, Petroleum; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA QD539 UT WOS:A1994QD53900002 ER PT J AU BENDER, MA SETLOW, RB AF BENDER, MA SETLOW, RB TI SPONTANEOUS AND INDUCED MICRONUCLEI AND UDS IN PERIPHERAL LYMPHOCYTES SO MUTATION RESEARCH-ENVIRONMENTAL MUTAGENESIS AND RELATED SUBJECTS LA English DT Article DE MICRONUCLEI; UNSCHEDULED DNA SYNTHESIS ID CHROMOSOMAL-ABERRATIONS; BLOOD LYMPHOCYTES; SCE AB We have examined the distributions both of spontaneous and X-ray-induced micronuclei (MN) and of spontaneous and UV-induced unscheduled DNA synthesis (autoradiographic grains; UDS) in cultures of peripheral blood lymphocytes from normal, healthy human volunteers. While the spontaneous MN and UDS do not differ significantly from the expected Poisson distributions, both the induced MN and UDS are strongly over distributed (i.e., variance much greater than mean). This not only must be allowed for in statistical tests used for population monitoring, but offers suggestive evidence that there are large differences in radiation response from sample to sample, some of which may reflect true differences among normal, healthy subjects. C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RP BENDER, MA (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. NR 9 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-1161 J9 MUTAT RES-ENVIR MUTA JI Mutat. Res.-Environ. Mutagen. Rel. Subj. PD OCT-DEC PY 1994 VL 313 IS 2-3 BP 209 EP 214 DI 10.1016/0165-1161(94)90051-5 PG 6 WC Environmental Sciences; Genetics & Heredity SC Environmental Sciences & Ecology; Genetics & Heredity GA PM076 UT WOS:A1994PM07600011 PM 7523906 ER PT J AU BOGEN, KT AF BOGEN, KT TI APPLICABILITY OF ALTERNATIVE MODELS OF REVERTANT VARIANCE TO AMES-TEST DATA FOR 121 MUTAGENIC CARCINOGENS SO MUTATION RESEARCH-GENETIC TOXICOLOGY LA English DT Article DE AMES TEST; SALMONELLA; SAMPLING ERROR; HETEROSCEDASTICITY; STATISTICAL PROCEDURES; GENERALIZED POISSON; NEGATIVE BINOMIAL; VARIANCE MODEL ID SALMONELLA MICROSOME ASSAY; STATISTICAL-ANALYSIS; POTENCY DATABASE; ANIMAL BIOASSAYS; CHRONOLOGICAL SUPPLEMENT; ESCHERICHIA-COLI; CHEMICALS; REPRODUCIBILITY; TYPHIMURIUM; REGRESSION AB Models of sampling variance in replicate revertant scores play a role in analyses of Ames-test data on mutagenicity in Salmonella, both in modeling the dose-response relation and in estimating initial dose-response slope or 'potency', e.g., for use in correlating mutagenic and carcinogenic potencies among different chemicals. Both generalized Poisson (GP) and negative binomial (NB) models of revertant variance have been applied in this way, but their empirical applicability has only been assessed using Ames-test data on a few chemicals. The applicability of these and related variance models was therefore assessed for 1905 such data sets pertaining to 121 putatively mutagenic carcinogens. Only similar to 50% of the data sets analyzed were found to involve a significantly positively correlated dose-response, and < 50% were found to exhibit a plausibly heterogeneous response variance regardless of dose-response correlation. Among data sets with plausibly heterogeneous variance, < 60% were found to exhibit significantly extra-Poisson variability. Among the significantly extra-Poisson data sets, most (> 75% among dose-response correlated data sets) were found to exhibit revertant variance consistent with both the GP and NB models; while the GP model was found to be somewhat more consistent with these data, the NB model more often gave a nominally better fit when both models were consistent. Implications of these results for the design of methods used to analyze Ames-test data are discussed. RP BOGEN, KT (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV HLTH & ECOL ASSESSMENT L453,7000 E AVE,LIVERMORE,CA 94550, USA. FU NCI NIH HHS [P01 CA55861-01] NR 41 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-1218 J9 MUTAT RES-GENET TOX JI Mutat. Res.-Genet. Toxicol. PD OCT PY 1994 VL 322 IS 4 BP 265 EP 273 DI 10.1016/0165-1218(94)90102-3 PG 9 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA PM072 UT WOS:A1994PM07200005 PM 7523920 ER PT J AU DINNEEN, MJ HAFNER, PR AF DINNEEN, MJ HAFNER, PR TI NEW RESULTS FOR THE DEGREE DIAMETER PROBLEM SO NETWORKS LA English DT Article ID INTERCONNECTION NETWORKS; GRAPHS AB The results of computer searches for large graphs with given (small) degree and diameter are presented. The new graphs are Cayley graphs of semidirect products of cyclic groups and related groups. One fundamental use of our ''dense graphs'' is in the design of efficient communication network topologies. (C) 1994 John Wiley & Sons, Inc. C1 UNIV AUCKLAND,DEPT MATH & STAT,AUCKLAND,NEW ZEALAND. RP DINNEEN, MJ (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 26 TC 15 Z9 15 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0028-3045 J9 NETWORKS JI Networks PD OCT PY 1994 VL 24 IS 7 BP 359 EP 367 DI 10.1002/net.3230240702 PG 9 WC Computer Science, Hardware & Architecture; Operations Research & Management Science SC Computer Science; Operations Research & Management Science GA PJ436 UT WOS:A1994PJ43600001 ER PT J AU FREEDMAN, MS AF FREEDMAN, MS TI WHY SHOULD THE TL-205 EXPERIMENT BE DONE SO NEUES JAHRBUCH FUR MINERALOGIE-ABHANDLUNGEN LA English DT Article DE SOLAR NEUTRINOS; NEUTRINO FLUX PROBLEM; THALLIUM DETECTOR; LASER-NMR ANALYZER ID GALLEX AB The justification for measuring the low energy solar neutrino flux averaged over geologic times with Tl-205 as detector, and the accuracy requirements, are discussed. RP FREEDMAN, MS (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 5 TC 1 Z9 1 U1 0 U2 1 PU E SCHWEIZERBART'SCHE VERLAGS PI STUTTGART PA NAEGELE U OBERMILLER JOHANNESSTRASSE 3A, D 70176 STUTTGART, GERMANY SN 0077-7757 J9 NEUES JB MINER ABH JI Neues Jahrb. Mineral.-Abh. PD OCT PY 1994 VL 167 IS 2-3 BP 247 EP 253 PG 7 WC Mineralogy SC Mineralogy GA PV891 UT WOS:A1994PV89100008 ER PT J AU NOBEL, PS CUI, MY ISRAEL, AA AF NOBEL, PS CUI, MY ISRAEL, AA TI LIGHT, CHLOROPHYLL, CARBOXYLASE ACTIVITY AND CO2 FIXATION AT VARIOUS DEPTHS IN THE CHLORENCHYMA OF OPUNTIA-FICUS-INDICA (L) MILLER UNDER CURRENT AND ELEVATED CO2 SO NEW PHYTOLOGIST LA English DT Article DE CO2 UPTAKE; LIGHT DISTRIBUTION; OPUNTIA FICUS-INDICA (PRICKLY PEAR CACTUS); PHOSPHOENOLPYRUVATE CARBOXYLASE; RUBISCO ID CRASSULACEAN ACID METABOLISM; PHOTOSYNTHETIC PROPERTIES; PALISADE TISSUE; PLANTS; LEAF; GRADIENTS; LEAVES; REFLECTANCE; ENVIRONMENT; TRANSMITTANCE AB Mature cladodes of Opuntia ficus-indica (L.) Miller have a thick chlorenchyma (about 4 mm) with a relatively high chlorophyll content (0.65 g m(-2)), suggesting that light may be greatly attenuated and hence CO2 fixation negligible in the inner part of this tissue. Indeed, blue light (400-470 nm) and red light (670-685 nm) were 99 % attenuated in the outer 2 mm of the chlorenchyma when the cladodes developed under both current and elevated CO2 concentrations. Nevertheless, the nocturnal acidity increase and C-14 accumulation following a brief exposure to (CO2)-C-14 night decreased only 22 to 47 % for a layer 2-3 mm deep in the chlorenchyma of this CAM plant. Under a particular growth CO2, the activities of both ribulose-1,5-bisphosphate carboxylase/oxygenase and phosphoenolpyruvate carboxylase were similar for each of the outer three 1-mm-thick layers of the chlorenchyma. Therefore, although the light level and total chlorophyll decreased sharply with depth and the chlorophyll a/b ratio also decreased, substantial CO2 fixation apparently occurs throughout most of the chlorenchyma. When O. ficus-indica was grown under 720 mu mol CO2 mol(-1), the chlorenchyma nas 20 % thicker but contained 11 % less chlorophyll and had a lower absorptance than under the current CO2 concentration (370 mu mol(-1) ). Greater nocturnal acidity increases and C-14 accumulation following exposure to (CO2)-C-14 at night occurred at the doubled CO2 concentration despite 29-39% reductions in the activities of the two carboxylating enzymes, the lower absorptance, and a 24 % increase in the cladode reflectance from 400 to 700 nm. C1 UNIV CALIF LOS ANGELES,UCLA-DOE LAB,LOS ANGELES,CA 90024. RP NOBEL, PS (reprint author), UNIV CALIF LOS ANGELES,DEPT BIOL,LOS ANGELES,CA 90024, USA. NR 31 TC 20 Z9 20 U1 0 U2 4 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0028-646X J9 NEW PHYTOL JI New Phytol. PD OCT PY 1994 VL 128 IS 2 BP 315 EP 322 DI 10.1111/j.1469-8137.1994.tb04015.x PG 8 WC Plant Sciences SC Plant Sciences GA PP399 UT WOS:A1994PP39900013 ER PT J AU WEINBERG, AM AF WEINBERG, AM TI THE LIGHT-WATER ADVENTURE - 50 YEARS LATER SO NUCLEAR ENGINEERING INTERNATIONAL LA English DT Article RP WEINBERG, AM (reprint author), OAK RIDGE ASSOCIATED UNIV,POB 117,OAK RIDGE,TN 37831, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU REED BUSINESS PUBLISHING LTD PI SUTTON PA QUADRANT HOUSE THE QUADRANT, SUTTON, SURREY, ENGLAND SM2 5AS SN 0029-5507 J9 NUCL ENG INT JI Nucl. Eng. Int. PD OCT PY 1994 VL 39 IS 483 BP 28 EP 30 PG 3 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PK605 UT WOS:A1994PK60500009 ER PT J AU CHANG, Z FREDRICKSON, ED CALLEN, JD MCGUIRE, KM BELL, MG BUDNY, RV BUSH, CE DARROW, DS JANOS, AC JOHNSON, LC PARK, HK SCOTT, SD STRACHAN, JD SYNAKOWSKI, EJ TAYLOR, G WIELAND, RM ZARNSTORFF, MC ZWEBEN, SJ AF CHANG, Z FREDRICKSON, ED CALLEN, JD MCGUIRE, KM BELL, MG BUDNY, RV BUSH, CE DARROW, DS JANOS, AC JOHNSON, LC PARK, HK SCOTT, SD STRACHAN, JD SYNAKOWSKI, EJ TAYLOR, G WIELAND, RM ZARNSTORFF, MC ZWEBEN, SJ TI TRANSPORT EFFECTS OF LOW (M,N) MHD MODES ON TFTR SUPERSHOTS SO NUCLEAR FUSION LA English DT Article ID FUSION TEST REACTOR; NEUTRAL BEAM INJECTION; TEARING MODE; TOKAMAK; CONFINEMENT; ENERGY; JET; INTERFEROMETER; EMISSION; PLASMAS AB Supershots in TFTR often suffer a performance deterioration characterized by a gradual decrease of the DD fusion neutron yield and plasma stored energy after several hundred milliseconds of auxiliary heating. The correlation between this performance deterioration and the development of low m (the poloidal mode number), n (the toroidal mode number) MHD modes is studied through shot-to-shot comparisons and statistical data analyses. A good correlation is observed between performance deterioration and the appearance of strong 3/2 and 4/3 macroscopic modes. The magnetic island structures are observed using Mirnov and ECE diagnostics. The measured T-e, T-i and n(e) profiles show that development of the islands corresponds to a nearly constant decrement of these quantities over the core region r < r(s), where r(s) is the mode rational surface, on a transport time-scale (t > tau(E)). The observed energy deterioration scaling, delta W/W proportional to w/a, where w is the magnetic island width and a is the plasma minor radius, agrees with a local transport model. Numerical simulations based on the local transport model reveal many features consistent with the experiments. Besides the MHD effect, it is found that a continuous increase of edge recycling rate during the neutral beam injection phase also has a large effect on the performance deterioration. C1 PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ. RP CHANG, Z (reprint author), UNIV WISCONSIN,MADISON,WI, USA. NR 44 TC 79 Z9 80 U1 4 U2 8 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 OCT PY 1994 VL 34 IS 10 BP 1309 EP 1336 DI 10.1088/0029-5515/34/10/I03 PG 28 WC Physics, Fluids & Plasmas SC Physics GA PT388 UT WOS:A1994PT38800003 ER PT J AU SESNIC, S KAITA, R KAYE, SM OKABAYASHI, M POWERS, EJ BELL, RE GAMMEL, GM HOLLAND, A IM, S KUGEL, HW LEBLANC, B LEVINTON, FM TAKAHASHI, H AF SESNIC, S KAITA, R KAYE, SM OKABAYASHI, M POWERS, EJ BELL, RE GAMMEL, GM HOLLAND, A IM, S KUGEL, HW LEBLANC, B LEVINTON, FM TAKAHASHI, H TI NONLINEAR COUPLING OF LOW N-MODES IN PBX-M SO NUCLEAR FUSION LA English DT Article ID DIGITAL BISPECTRAL ANALYSIS; PLASMA AB In many of the medium and high beta discharges in PBX-M, low n modes (n = 1-4) with different n numbers are observed. The prevalence of low n modes decreases with increasing n number. Furthermore, if two modes of different frequency and n number (omega(1) and omega(2); k(1) and k(2)) are simultaneously present in the plasma, these modes interact non-linearly and create sidebands in frequency (omega(2) +/- omega(1)) and wavenumber (k(2) +/- k(1) or n(2) +/- n(1) and m(2) +/- m(2)). It has also been observed that if these fundamental modes, omega(1)/k(1) and omega(2)/k(2), contain strong harmonics, the harmonics also interact non-linearly, creating more non-linear products: k omega(2) +/- l omega(1) and kk(2) +/- lk(1), where k and l are integers describing the harmonies. These multiple three wave couplings on a given rational surface can create several modes of the same m and n numbers but of different phase velocities. The multiple perturbations of the rational surfaces can increase the plasma losses. In fact, a decrease in neutron rate and an enhanced loss of medium energy ions are observed during this three wave coupling interaction. Although the three wave coupling has been observed primarily in medium or high beta discharges, it is a more general plasma phenomenon because it also occurs occasionally at low beta. RP SESNIC, S (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ, USA. NR 18 TC 5 Z9 5 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 OCT PY 1994 VL 34 IS 10 BP 1365 EP 1383 DI 10.1088/0029-5515/34/10/I06 PG 19 WC Physics, Fluids & Plasmas SC Physics GA PT388 UT WOS:A1994PT38800006 ER PT J AU BENARY, O CLELAND, W CUNITZ, H FERGUSON, I GORDEEV, A GORDON, H KISTENEV, E KROON, P LELTCHOUK, M LISSAUER, D MA, H MAKOWIECKI, D MASLENNIKOV, A MCCORKLE, S ONOPRIENKO, D ONUCHIN, A OREN, Y PANIN, V PARSONS, JA RADEKA, V RAHM, D ROGERS, L RESCIA, S RUTHERFOORD, J SEMAN, M SIPPACH, W SMITH, M SONDERICKER, J SONNADARA, U STEINER, R STEPHANI, D STERN, E STUMER, I TAKAI, H THEMANN, H TIKHONOV, Y WILLIS, WJ AF BENARY, O CLELAND, W CUNITZ, H FERGUSON, I GORDEEV, A GORDON, H KISTENEV, E KROON, P LELTCHOUK, M LISSAUER, D MA, H MAKOWIECKI, D MASLENNIKOV, A MCCORKLE, S ONOPRIENKO, D ONUCHIN, A OREN, Y PANIN, V PARSONS, JA RADEKA, V RAHM, D ROGERS, L RESCIA, S RUTHERFOORD, J SEMAN, M SIPPACH, W SMITH, M SONDERICKER, J SONNADARA, U STEINER, R STEPHANI, D STERN, E STUMER, I TAKAI, H THEMANN, H TIKHONOV, Y WILLIS, WJ TI LIQUID IONIZATION CALORIMETRY WITH TIME-SAMPLED SIGNALS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID SYSTEM AB We present the results of a study of amplitude and timing measurements made in a liquid krypton electromagnetic calorimeter, using multiply sampled signals of the shaped waveform. The measurements were designed to emulate the type of data that will be available from a calorimeter operating at future hadron-hadron colliders with short (approximately 20 ns) spacing between bunch crossings. Data have been collected with 18 ns sample spacing on waveforms from individual calorimeter sections with a shaping time of 40 ns and from 5 x 5 tower analog sums with a shaping time of 50 ns. The amplitude was measured using the analog sum signal, and the timing was measured using the signal from the individual sections. The data were processed using the method of optimal filtering, and a reduction in the noise of about a factor of two over that for a single sample is seen when using multiple samples for determining the amplitude. We find an energy resolution of 6.7%/square-root E, in agreement with the resolution measured for the same calorimeter using a single sample measured at the peak of the waveform. The timing resolution for a section of a calorimeter tower with deposited energy epsilon can be expressed as square-root (c/epsilon)2 + sigma(cal)2, with a value of c of 0.38 GeV ns for the front section (the first 6 radiation lengths) and 0.70 GeV ns for the back section, and a value of 0.15 ns for sigma(cal). C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. ADELPHI UNIV,GARDEN CITY,NY 11530. UNIV ARIZONA,TUCSON,AZ 85722. BUDKER INST NUCL PHYS,NOVOSIBIRSK,RUSSIA. COLUMBIA UNIV,NEVIS LABS,IRVINGTON,NY 10533. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV PITTSBURGH,PITTSBURGH,PA 15260. SUNY STONY BROOK,STONY BROOK,NY 11794. TEL AVIV UNIV,IL-69978 TEL AVIV,ISRAEL. RI Rescia, Sergio/D-8604-2011; Sonnadara, Upul/E-6359-2010; Takai, Helio/C-3301-2012; OI Rescia, Sergio/0000-0003-2411-8903; Takai, Helio/0000-0001-9253-8307; Sonnadara, Upul/0000-0001-7862-2537 NR 9 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 OCT 1 PY 1994 VL 349 IS 2-3 BP 367 EP 383 DI 10.1016/0168-9002(94)91200-9 PG 17 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PJ262 UT WOS:A1994PJ26200010 ER PT J AU FIELDS, DE VANHECKE, H BOISSEVAIN, J JACAK, BV SONDHEIM, WE SULLIVAN, JP WILLIS, WJ WOLF, K NOTEBOOM, E PETERS, PM BURKE, R AF FIELDS, DE VANHECKE, H BOISSEVAIN, J JACAK, BV SONDHEIM, WE SULLIVAN, JP WILLIS, WJ WOLF, K NOTEBOOM, E PETERS, PM BURKE, R TI USE OF AEROGEL FOR IMAGING CHERENKOV COUNTERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID EUROPEAN HYBRID SPECTROMETER; SILICA AEROGEL; DETECTOR; TESTS AB In the past, detectors using silica aerogel as a Cherenkov radiator treated this material as a diffuse source of Cherenkov photons. In this paper we report on measurements made to explore the feasibility of using aerogel for imaging Cherenkov purposes. The results of the measurements are reproduced by a detailed Monte Carlo. This allows us to identify parameters critical for the use of aerogel as a radiator in imaging detectors. We conclude that commercially available aerogel can be used for these purposes. C1 COLUMBIA UNIV,NEW YORK,NY 10027. TEXAS A&M UNIV,COLLEGE STN,TX 77843. CREIGHTON UNIV,OMAHA,NE 68178. RP FIELDS, DE (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 22 TC 22 Z9 22 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 OCT 1 PY 1994 VL 349 IS 2-3 BP 431 EP 437 DI 10.1016/0168-9002(94)91207-6 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PJ262 UT WOS:A1994PJ26200017 ER PT J AU WAMPLER, WR DOYLE, BL AF WAMPLER, WR DOYLE, BL TI LOW-ENERGY BETA-SPECTROSCOPY USING PIN DIODES TO MONITOR TRITIUM SURFACE CONTAMINATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB We show that tritium betas emitted from a surface can be counted using a pin photodiode as a solid state charged particle detector. Furthermore, we show that the range of tritium betas through air is sufficient to allow measurement of tritium on samples in air by this method. These two findings make possible a new method to survey tritium surface contamination which has advantages over existing methods. We have built and tested several prototype instruments which use this method to measure tritium surface contamination, including a compact portable unit. The design of these instruments and results from tests and calibrations are described. Potential applications of this new method to monitor tritium are discussed. RP WAMPLER, WR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 19 TC 18 Z9 18 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 OCT 1 PY 1994 VL 349 IS 2-3 BP 473 EP 480 DI 10.1016/0168-9002(94)91213-0 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PJ262 UT WOS:A1994PJ26200023 ER PT J AU WAREING, TA WALTERS, WF MOREL, JE AF WAREING, TA WALTERS, WF MOREL, JE TI DIFFUSION-ACCELERATED SOLUTION OF THE 2-DIMENSIONAL X-Y S(N) EQUATIONS WITH LINEAR-BILINEAR NODAL DIFFERENCING SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Note ID SYNTHETIC ACCELERATION AB Recently, a new diffusion synthetic acceleration scheme was developed for solving the two-dimensional S(n) equations in x-y geometry with bilinear-discontinuous finite element spatial discretization, by using a bilinear-discontinuous diffusion differencing scheme for the diffusion acceleration equations. This method differed from previous methods in that it is unconditionally efficient for problems with isotropic or nearly isotropic scattering. Here, the same bilinear-discontinuous diffusion differencing scheme, and associated multilevel solution technique, is used to accelerate the x-y geometry S(n) equations with linear-bilinear nodal spatial differencing. It is found that for problems with isotropic or nearly isotropic scattering, this leads to an unconditionally efficient solution method. Computational results are given that demonstrate this property. RP WAREING, TA (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 10 TC 4 Z9 4 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD OCT PY 1994 VL 118 IS 2 BP 122 EP 126 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PK469 UT WOS:A1994PK46900006 ER PT J AU UENG, TS OCONNELL, WJ AF UENG, TS OCONNELL, WJ TI NEAR-FIELD DIFFUSION RELEASES THROUGH ONE AND 2 FINITE PLANAR ZONES FROM A NUCLEAR WASTE PACKAGE SO NUCLEAR TECHNOLOGY LA English DT Article AB For a nuclear waste package emplacement in a potential repository in partially saturated rock, a rock rubble or backfill zone may act more as a barrier than as a pathway for diffusive release of radionuclides. We approximate the diffusive transport process using one-dimensional, one- and two-barrier geometries. The one-barrier model suffices when the effective diffusion coefficient in the first zone, the rubble, is substantially lower than that in the second zone, the host rock. For more generality, such as two zones of comparable diffusivities, or for an additional barrier zone, we model two barrier zones both of finite extent. We present solutions for three types of radionuclide mobilization at the source: a pulse transient input, a steady input rate, and a constant concentration. The algebraic series form of the solutions aids analysis of sensitivity of breakthrough times and peak release rates. For the one-zone case, dimensionless parameters allow plotting of the family of transient solutions on a single graph. Comparisons between results of one- and two-zone models and with published results for different geometries and solution methods support verification of the solutions in this study. C1 STANFORD UNIV,STANFORD,CA 94305. RP UENG, TS (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L 631,LIVERMORE,CA 94550, USA. NR 8 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 OCT PY 1994 VL 108 IS 1 BP 80 EP 89 PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PH305 UT WOS:A1994PH30500007 ER PT J AU GOMBERT, D AF GOMBERT, D TI TREATABILITY TESTING TO EVALUATE WHAT CAN WORK SO NUCLEAR TECHNOLOGY LA English DT Article ID CHEMICAL-EXTRACTION; HEAVY-METALS; SEDIMENTS AB A soil sample from the Idaho National Engineering Laboratory was physically and chemically characterized, then sequentially extracted to determine if soil washing could be effectively used to remove cesium, cobalt, and chromium. The contaminant distribution did not correlate with surface area or any particular crystalline phase. However, the transition metals did appear to be coincident with the matrix transition metals, iron and manganese. This finding was verified by sequential-extraction data, which showed that most of the cobalt and chromium was extracted by destroying the soil hydrated metal-oxide phases. Unfortunately, <20% of the cesium was extractable even after dissolving >20% of the soil mass. The low recovery of cesium, the primary risk-driver, eliminated extractive soil washing from further consideration for this site. C1 OREGON STATE UNIV,PORTLAND,OR. UNIV IDAHO,IDAHO FALLS,ID. RP GOMBERT, D (reprint author), WESTINGHOUSE IDAHO NUCL CO INC,POB 4000,IDAHO FALLS,ID 83415, USA. NR 14 TC 9 Z9 10 U1 0 U2 4 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 OCT PY 1994 VL 108 IS 1 BP 90 EP 99 PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PH305 UT WOS:A1994PH30500008 ER PT J AU ASTON, D AWAJI, N BIENZ, T BIRD, F DAMORE, J DUNWOODIE, W ENDORF, R FUJII, K HAYASHII, H IWATA, S JOHNSON, WB KAJIKAWA, R KUNZ, P KWON, Y LEITH, DWGS LEVINSON, L MARTINEZ, J MATSUI, T MEADOWS, BT MIYAMOTO, A NUSSBAUM, M OZAKI, H PAK, CO RATCLIFF, BN RENSING, P SCHULTZ, D SHAPIRO, S SHIMOMURA, T SINERVO, PK SUGIYAMA, A SUZUKI, S TARNOPOLSKY, G TAUCHI, T TOGE, N UKAI, K WAITE, A WILLIAMS, S AF ASTON, D AWAJI, N BIENZ, T BIRD, F DAMORE, J DUNWOODIE, W ENDORF, R FUJII, K HAYASHII, H IWATA, S JOHNSON, WB KAJIKAWA, R KUNZ, P KWON, Y LEITH, DWGS LEVINSON, L MARTINEZ, J MATSUI, T MEADOWS, BT MIYAMOTO, A NUSSBAUM, M OZAKI, H PAK, CO RATCLIFF, BN RENSING, P SCHULTZ, D SHAPIRO, S SHIMOMURA, T SINERVO, PK SUGIYAMA, A SUZUKI, S TARNOPOLSKY, G TAUCHI, T TOGE, N UKAI, K WAITE, A WILLIAMS, S TI RECENT LASS RESULTS IN MESON SPECTROSCOPY SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT Conference HADRON 93 CY JUN 21-25, 1993 CL COMO, ITALY AB Results from partial-wave analyses by the E135 Collaboration of the K- omega and the hypercharge exchange produced pi(+)pi(-) systems were presented. The data described were taken from a 4.1 event/nb exposure of the LASS spectrometer at SLAC to an 11 GeV/c K- beam. C1 NAGOYA UNIV, DEPT PHYS, NAGOYA, AICHI 464, JAPAN. UNIV CINCINNATI, DEPT PHYS, CINCINNATI, OH 45221 USA. UNIV TOKYO, INST NUCL STUDY, TOKYO 188, JAPAN. RP ASTON, D (reprint author), STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD OCT PY 1994 VL 107 IS 10 BP 1797 EP 1798 DI 10.1007/BF02823572 PG 2 WC Physics, Particles & Fields SC Physics GA PZ087 UT WOS:A1994PZ08700001 ER PT J AU DONSKOV, SV INYAKIN, AV KACHANOV, VA KHAUSTOV, GV KONDASHOV, AA KULIK, AV LANDSBERG, GL LEDNEV, AA LISHIN, VA POLOVNIKOV, SA POLYAKOV, VA PROKOSHKIN, YD SADOVSKY, SA SAMOYLENKO, VD SHAGIN, PM SHTANNIKOV, AV SINGOVSKY, AV SUGONYAEV, VP BRICMAN, C STROOT, JP BINON, FG GOUANERE, M PEIGNEUX, JP POULET, M ALDE, D KNAPP, E BOUTEMEUR, M AF DONSKOV, SV INYAKIN, AV KACHANOV, VA KHAUSTOV, GV KONDASHOV, AA KULIK, AV LANDSBERG, GL LEDNEV, AA LISHIN, VA POLOVNIKOV, SA POLYAKOV, VA PROKOSHKIN, YD SADOVSKY, SA SAMOYLENKO, VD SHAGIN, PM SHTANNIKOV, AV SINGOVSKY, AV SUGONYAEV, VP BRICMAN, C STROOT, JP BINON, FG GOUANERE, M PEIGNEUX, JP POULET, M ALDE, D KNAPP, E BOUTEMEUR, M TI MEASUREMENT OF THE OMEGA-]ETA-GAMMA DECAY-RATE SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT Conference HADRON 93 CY JUN 21-25, 1993 CL COMO, ITALY ID OMEGA AB The branching ratio of the rare radiative decay omega --> eta gamma has been measured: BR(omega --> eta gamma) = (8.3 +/- 2.1).10(-4). The experiment was performed at the IHEP (Serpukhov) accelerator with 38 GeV/c incident pions in the charge-exchange reaction pi(-)p --> omega n, the photons from the omega --> eta gamma --> 3 gamma decay being detected with the multiphoton spectrometer GAMS-2900. The influence of omega-rho mixing, which was a source of ambiguity in the interpretation of previous experiments, has been much reduced by measuring the omega produced at large momentum transfer. C1 INST INTERUNIV SCI NUCL, BRUSSELS, BELGIUM. FREE UNIV BRUSSELS, BRUSSELS, BELGIUM. LAB ANNECY LE VIEUX PHYS PARTICULES, ANNECY, FRANCE. LOS ALAMOS NATL LAB, LOS ALAMOS, NM USA. CERN, GENEVA, SWITZERLAND. RP DONSKOV, SV (reprint author), INST HIGH ENERGY PHYS, PROTVINO, RUSSIA. NR 14 TC 0 Z9 0 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD OCT PY 1994 VL 107 IS 10 BP 1799 EP 1805 PG 7 WC Physics, Particles & Fields SC Physics GA PZ087 UT WOS:A1994PZ08700002 ER PT J AU AMSLER, C ARMSTRONG, DS AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T CHUNG, SU COOPER, A CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWKSY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MONTANET, L NOBLE, A OULDSAADA, F PETERS, K PINTER, G RAVNDAL, S SALK, J SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WASSMER, S WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C AF AMSLER, C ARMSTRONG, DS AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T CHUNG, SU COOPER, A CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWKSY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MONTANET, L NOBLE, A OULDSAADA, F PETERS, K PINTER, G RAVNDAL, S SALK, J SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WASSMER, S WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C TI NEW RESULTS FROM CRYSTAL-BARREL SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT Conference HADRON 93 CY JUN 21-25, 1993 CL COMO, ITALY ID ANTIPROTON-PROTON ANNIHILATION; REST; ETA; STATE; GAMMA; OMEGA AB Results are presented on meson spectroscopy, two-body final states and meson decay modes observed in (p) over bar p annhilation at rest by the Crystal Barrel experiment at LEAR. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RUHR UNIV BOCHUM, W-4630 BOCHUM, GERMANY. HUNGARIAN ACAD SCI, H-1525 BUDAPEST, HUNGARY. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. CERN, CH-1211 GENEVA, SWITZERLAND. UNIV HAMBURG, W-2000 HAMBURG, GERMANY. UNIV KARLSRUHE, W-7500 KARLSRUHE, GERMANY. UNIV LONDON QUEEN MARY & WESTFIELD COLL, LONDON E1 4NS, ENGLAND. UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA. UNIV MAINZ, W-6500 MAINZ, GERMANY. UNIV MUNICH, W-8000 MUNICH, GERMANY. CTR RECH NUCL, F-67037 STRASBOURG, FRANCE. RP AMSLER, C (reprint author), UNIV ZURICH, CH-8001 ZURICH, SWITZERLAND. OI Burchell, Mark/0000-0002-2680-8943; Meyer, Curtis/0000-0001-7599-3973 NR 15 TC 1 Z9 1 U1 0 U2 1 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 OCT PY 1994 VL 107 IS 10 BP 1815 EP 1823 PG 9 WC Physics, Particles & Fields SC Physics GA PZ087 UT WOS:A1994PZ08700004 ER PT J AU GARA, A KNAPP, BC CHRISTIAN, D GUTIERREZ, G WEHMANN, A FELIX, J MORENO, G ROMERO, M SOSA, M BERISSO, MC HARTOUNI, EP KREISLER, MN LEE, S MARKIANOS, K WESSON, D AF GARA, A KNAPP, BC CHRISTIAN, D GUTIERREZ, G WEHMANN, A FELIX, J MORENO, G ROMERO, M SOSA, M BERISSO, MC HARTOUNI, EP KREISLER, MN LEE, S MARKIANOS, K WESSON, D TI LIGHT-MESON SPECTROSCOPY IN FERMILAB EXPERIMENT E690 SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT Conference HADRON 93 CY JUN 21-25, 1993 CL COMO, ITALY ID SPEED AB During the last Fermilab fixed-target run experiment E690 wrote on tape five billion events in the reaction pp --> Xp(fast). The beam momentum was 800 GeV/c, the target liquid hydrogen and fake p(fast) was a -t < 0.6 GeV2 forward-going proton with momentum greater than 600 GeV/c. The X system was required to have at least one charged track in an approximately 700 mrad forward cone. The diffractive trigger and the high statistics provide an ideal data set with which to search for light-meson states. We present mass plots based on an analysis of 5% of our data in the channels pp --> p(slow) (X) p(fast) with (X): a) K-s K-+/- pi(-/+), b) phi phi, c) KsKs, and d) K+K-. C1 FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL USA. UNIV GUANAJUATO, LEON, GUANAJUATO, MEXICO. UNIV MASSACHUSETTS, AMHERST, MA USA. RP GARA, A (reprint author), COLUMBIA UNIV, NEVIS LABS, NEW YORK, NY USA. OI Hartouni, Edward/0000-0001-9869-4351 NR 3 TC 0 Z9 0 U1 1 U2 2 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 OCT PY 1994 VL 107 IS 10 BP 1847 EP 1855 DI 10.1007/BF02823579 PG 9 WC Physics, Particles & Fields SC Physics GA PZ087 UT WOS:A1994PZ08700008 ER PT J AU GARBINCIUS, PH AF GARBINCIUS, PH TI RECENT FERMILAB RESULTS ON HADROPRODUCTION OF HEAVY FLAVORS SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT Conference HADRON 93 CY JUN 21-25, 1993 CL COMO, ITALY ID SILICON VERTEX DETECTOR; TOP-QUARK; HADRONIC PRODUCTION; 800 GEV/C; DEPENDENCE; COLLISIONS; PARTICLES; NUCLEON; J/PSI; DECAY AB Recent results from various Fermilab experiments on the hadroproduction of states containing charm, bottom, and top quarks are discussed. These include observation of the spectra, lifetimes, and production characteristics of charmonium, open charm states, and bottom particle production with both high-energy fixed target and (p) over bar-p collider facilities. The status of the search for the top quark by the Fermilab collider experiments is updated. RP FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. NR 63 TC 0 Z9 0 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD OCT PY 1994 VL 107 IS 10 BP 1989 EP 2006 DI 10.1007/BF02823593 PG 18 WC Physics, Particles & Fields SC Physics GA PZ087 UT WOS:A1994PZ08700022 ER PT J AU FRABETTI, PL CHEUNG, HWK CUMALAT, JP DALLAPICCOLA, C GINKEL, JF GREENE, SV JOHNS, WE NEHRING, MS BUTLER, JN CIHANGIR, S GAINES, I GARBINCIUS, PH GARREN, L GOURLAY, SA HARDING, DJ KASPER, P KREYMER, A LEBRUN, P SHUKLA, S VITTONE, M BIANCO, S FABBRI, FL SARWAR, S ZALLO, A CULBERTSON, R GARDNER, RW GREENE, R WISS, J ALIMONTI, G BELLINI, G CACCIANIGA, B CINQUINI, L DICORATO, M GIAMMARCHI, M INZANI, P LEVERARO, F MALVEZZI, S MENASCE, D MERONI, E MORONI, L PEDRINI, D PERASSO, L SALA, A SALA, S TORRETTA, D BUCHHOLZ, D CLAES, D GOBBI, B OREILLY, B BISHOP, JM CASON, NM KENNEDY, CJ KIM, GN LIN, TF PUSELJIC, DL RUCHTI, RC SHEPHARD, WD SWIATEK, JA WU, ZY ARENA, V BOCA, G CASTOLDI, C GIANINI, G RATTI, SP RICCARDI, C VITULO, P LOPEZ, A GRIM, GP PAOLONE, VS YAGER, PM WILSON, JR SHELDON, PD DAVENPORT, F FILASETA, JF BLACKETT, GR PISHARODY, M HANDLER, T CHEON, BG KANG, JS KIM, KY AF FRABETTI, PL CHEUNG, HWK CUMALAT, JP DALLAPICCOLA, C GINKEL, JF GREENE, SV JOHNS, WE NEHRING, MS BUTLER, JN CIHANGIR, S GAINES, I GARBINCIUS, PH GARREN, L GOURLAY, SA HARDING, DJ KASPER, P KREYMER, A LEBRUN, P SHUKLA, S VITTONE, M BIANCO, S FABBRI, FL SARWAR, S ZALLO, A CULBERTSON, R GARDNER, RW GREENE, R WISS, J ALIMONTI, G BELLINI, G CACCIANIGA, B CINQUINI, L DICORATO, M GIAMMARCHI, M INZANI, P LEVERARO, F MALVEZZI, S MENASCE, D MERONI, E MORONI, L PEDRINI, D PERASSO, L SALA, A SALA, S TORRETTA, D BUCHHOLZ, D CLAES, D GOBBI, B OREILLY, B BISHOP, JM CASON, NM KENNEDY, CJ KIM, GN LIN, TF PUSELJIC, DL RUCHTI, RC SHEPHARD, WD SWIATEK, JA WU, ZY ARENA, V BOCA, G CASTOLDI, C GIANINI, G RATTI, SP RICCARDI, C VITULO, P LOPEZ, A GRIM, GP PAOLONE, VS YAGER, PM WILSON, JR SHELDON, PD DAVENPORT, F FILASETA, JF BLACKETT, GR PISHARODY, M HANDLER, T CHEON, BG KANG, JS KIM, KY TI NEW RESULTS ON HEAVY-FLAVOR PHOTOPRODUCTION FROM THE E687 EXPERIMENT AT FNAL SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT Conference HADRON 93 CY JUN 21-25, 1993 CL COMO, ITALY ID LUND MONTE-CARLO; JET FRAGMENTATION; CHARM DECAYS; E+E-PHYSICS; MESONS AB The new results on charm horn E687 photoproduction experiment are presented. They follow from very high statistic measurements and cover a wide variety of physics items in the charm sector. Charm photoproduction studies, very accurate lifetime measurements, analysis of several semi-leptonic decays and hadronic decays are discussed. Particular attention has been devoted to compare E687 results with other experiments. C1 IST NAZL FIS NUCL, I-40124 BOLOGNA, ITALY. UNIV COLORADO, BOULDER, CO 80309 USA. FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. IST NAZL FIS NUCL, LAB NAZL FRASCATI, I-00044 FRASCATI, ITALY. UNIV ILLINOIS, URBANA, IL 61801 USA. UNIV MILAN, DIPARTIMENTO FIS, MILAN, ITALY. IST NAZL FIS NUCL, I-20133 MILAN, ITALY. NORTHWESTERN UNIV, EVANSTON, IL 60208 USA. UNIV NOTRE DAME, NOTRE DAME, IN 46556 USA. UNIV PAVIA, DIPARTIMENTO FIS NUCL & TEOR, I-27100 PAVIA, ITALY. IST NAZL FIS NUCL, I-27100 PAVIA, ITALY. UNIV PUERTO RICO, MAYAGUEZ, PR USA. UNIV CALIF DAVIS, DAVIS, CA 95616 USA. UNIV S CAROLINA, COLUMBIA, SC 29208 USA. VANDERBILT UNIV, NASHVILLE, TN 37235 USA. UNIV N CAROLINA, ASHEVILLE, NC 28804 USA. NO KENTUCKY UNIV, HIGHLAND HTS, KY 41076 USA. UNIV TENNESSEE, KNOXVILLE, TN 37996 USA. KOREA UNIV, SEOUL 136701, SOUTH KOREA. RP FRABETTI, PL (reprint author), UNIV BOLOGNA, DIPARTMENTO FIS, BOLOGNA, ITALY. RI Menasce, Dario Livio/A-2168-2016; Gianini, Gabriele/M-5195-2014; OI Menasce, Dario Livio/0000-0002-9918-1686; Gianini, Gabriele/0000-0001-5186-0199; bianco, stefano/0000-0002-8300-4124 NR 19 TC 0 Z9 0 U1 0 U2 2 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 OCT PY 1994 VL 107 IS 10 BP 2025 EP 2043 PG 19 WC Physics, Particles & Fields SC Physics GA PZ087 UT WOS:A1994PZ08700025 ER PT J AU KANG, K VALIN, P WHITE, AR AF KANG, K VALIN, P WHITE, AR TI STATUS OF THE HIGH-ENERGY ELASTIC-SCATTERING - TOTAL CROSS-SECTION, REAL PART AND D-SIGMA/DT SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT Conference HADRON 93 CY JUN 21-25, 1993 CL COMO, ITALY AB A complete database of experimental results on high-energy elastic scattering including the most recent reports from UA4/2, CDF and E710 is fitted by both the standard and non-standard analytic parametrizations for the elastic pp and (p) over bar p amplitudes. The standard theoretical models of the Pomeron and Regge terms can reproduce the data well, while the new CDF total cross-section can support the existence of some non-standard physics. C1 KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, SEOUL, SOUTH KOREA. UNIV MONTREAL, PHYS NUCL LAB, MONTREAL, PQ H3C 3J7, CANADA. ARGONNE NATL LAB, DIV HIGH ENERGY PHYS, ARGONNE, IL 60439 USA. SEOUL NATL UNIV, CTR THEORET PHYS, SEOUL, SOUTH KOREA. RP KANG, K (reprint author), BROWN UNIV, DEPT PHYS, PROVIDENCE, RI 02912 USA. NR 20 TC 5 Z9 5 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 OCT PY 1994 VL 107 IS 10 BP 2103 EP 2108 DI 10.1007/BF02823604 PG 6 WC Physics, Particles & Fields SC Physics GA PZ087 UT WOS:A1994PZ08700033 ER PT J AU PETRATOS, GG AF PETRATOS, GG TI SLAG MEASUREMENTS OF THE NEUTRON SPIN-STRUCTURE FUNCTION SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT Conference HADRON 93 CY JUN 21-25, 1993 CL COMO, ITALY ID INELASTIC ELECTRON-SCATTERING; POLARIZED ELECTROPRODUCTION; ANGULAR-MOMENTUM; GLOBAL ANALYSIS; CROSS-SECTIONS; HIGH-DENSITY; SUM-RULE; E-P; PROTON; NUCLEONS AB Results from a measurement of the neutron spin-dependent structure function g(1)(n)(x) over a range in x from 0.03 to 0.6 and with Q(2) > 1 (GeV/c(2)) are presented. The experiment consisted of scattering a longitudinally polarized electron beam from the Stanford Linear Accelerator off a polarized He-3 target and detecting scattered electrons in two magnetic spectrometers. The results are interpreted in the quark-parton model and used to test the Bjorken sum rule. RP PETRATOS, GG (reprint author), STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. NR 32 TC 1 Z9 1 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 OCT PY 1994 VL 107 IS 10 BP 2197 EP 2209 PG 13 WC Physics, Particles & Fields SC Physics GA PZ087 UT WOS:A1994PZ08700042 ER PT J AU RIGAMONTI, A ALDROVANDI, S BORSA, F CARRETTA, P CINTOLESI, F CORTI, M RUBINI, S AF RIGAMONTI, A ALDROVANDI, S BORSA, F CARRETTA, P CINTOLESI, F CORTI, M RUBINI, S TI AN OVERVIEW ON RECENT NMR-NQR STUDIES OF HIGH-T-C SUPERCONDUCTORS AND OF THEIR PRECURSORS AF SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA D-CONDENSED MATTER ATOMIC MOLECULAR AND CHEMICAL PHYSICS FLUIDS PLASMAS BIOPHYSICS LA English DT Article; Proceedings Paper CT VII Congress of SATT CY OCT 04-07, 1994 CL TORINO, ITALY ID Y-89 NMR; NUCLEAR-RELAXATION; CU-63; YBA2CU3O7-DELTA; DYNAMICS; MOTION AB An overview on some works recently carried out by means of pulsed NMR-NQR experiments is given. The choice of the arguments is aimed at providing a flash on the topics and phenomena most tipically studied with the afore-mentioned approach: from the antiferromagnets (AF) precursors of high-temperature superconductors upon charge and spin doping (such as CuO-doped Li, La2CuO4-doped Sr and Zn) to the doping regime leading to superconductivity in LASCO and YBCO, with the related issues involving the comparison with the Fermi-liquid behaviour, the possible opening of a pseudo-spin-gap above T-c and the anisotropy and field effect ratios below T-c, the latter also in relation to the s-wave or d-wave orbital coupling. Finally, the topic of the motions of the flux lines in YBCO is addressed, in particular by discussing some experiments based on spin-echo dephasing due to thermal excitations and in the presence of d.c. currents and pulsed magnetic fields. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP RIGAMONTI, A (reprint author), UNIV PAVIA,DIPARTIMENTO FIS A VOLTA,VIA BASSI 6,I-27100 PAVIA,ITALY. RI Rubini, Silvia/C-8369-2012 OI Rubini, Silvia/0000-0001-5215-2223 NR 20 TC 3 Z9 3 U1 0 U2 1 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 0392-6737 J9 NUOVO CIMENTO D JI Nuovo Cimento Soc. Ital. Fis. D-Condens. Matter At. Mol. Chem. Phys. Fluids Plasmas Biophys. PD OCT-NOV PY 1994 VL 16 IS 10-11 BP 1743 EP 1753 DI 10.1007/BF02462169 PG 11 WC Physics, Multidisciplinary SC Physics GA QZ827 UT WOS:A1994QZ82700016 ER PT J AU ROMANO, P DILEO, R NIGRO, A CUCOLO, AM DABROWSKI, B RADAELLI, PG AF ROMANO, P DILEO, R NIGRO, A CUCOLO, AM DABROWSKI, B RADAELLI, PG TI TUNNEL SPECTROSCOPY INTO THE YBA2CU4O8 COMPOUND SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA D-CONDENSED MATTER ATOMIC MOLECULAR AND CHEMICAL PHYSICS FLUIDS PLASMAS BIOPHYSICS LA English DT Article; Proceedings Paper CT VII Congress of SATT CY OCT 04-07, 1994 CL TORINO, ITALY ID SINGLE-CRYSTAL; YBA2CU3O7-DELTA AB We have realized planar tunnel junctions using both Y123 and Y124 single crystals as base electrodes and Pb as counterelectrode. The crystals, with T-c = = 90 K (Y123) and T-c = 80 K (Y124), have been chemically etched and natural barriers were formed by a short air exposure. We have compared the tunneling spectra obtained on both systems. The features at about +/-18 mV of the Y123 compound are still observed in the Y124, while the low-bias structures at +/- 5mV are not present in the tunneling characteristics of the Y124 system. Linearity of the background conductance is also observed, with less steep slopes in Y124 that might indicate a reduced interlayer coupling in this system. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115. RP ROMANO, P (reprint author), UNIV SALERNO,DIPARTIMENTO FIS,I-84081 BARONISSI,ITALY. RI Radaelli, Paolo/C-2952-2011 OI Radaelli, Paolo/0000-0002-6717-035X NR 10 TC 0 Z9 0 U1 0 U2 1 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 0392-6737 J9 NUOVO CIMENTO D JI Nuovo Cimento Soc. Ital. Fis. D-Condens. Matter At. Mol. Chem. Phys. Fluids Plasmas Biophys. PD OCT-NOV PY 1994 VL 16 IS 10-11 BP 1885 EP 1888 DI 10.1007/BF02462189 PG 4 WC Physics, Multidisciplinary SC Physics GA QZ827 UT WOS:A1994QZ82700036 ER PT J AU LAVOREL, S ONEILL, RV GARDNER, RH AF LAVOREL, S ONEILL, RV GARDNER, RH TI SPATIOTEMPORAL DISPERSAL STRATEGIES AND ANNUAL PLANT-SPECIES COEXISTENCE IN A STRUCTURED LANDSCAPE SO OIKOS LA English DT Review ID RANDOMLY VARYING ENVIRONMENTS; ESS GERMINATION STRATEGIES; TALL-GRASS PRAIRIE; SHORT-LIVED FORBS; SEED SIZE; POPULATION-DYNAMICS; SERPENTINE GRASSLAND; NEIGHBORHOOD MODELS; GOPHER DISTURBANCE; CHALK GRASSLANDS AB Field observations and models have shown: (1) differences in dispersal and dormancy strategies could account for species coexistence in disturbed environments, (2) small scale disturbances contribute to species coexistence in plant communities, and (3) recolonization success may depend on the spatial pattern of suitable sites for establishment. A spatially explicit, two-species, simulation model was developed to examine the interaction between dispersal strategies, dormancy strategies and small-scale disturbances on the pattern of coexistence of two annual plant species in patchy landscapes. Patchy landscapes with three hierarchical levers of structure were randomly generated and the dynamics for species differing in mean dispersal distance and dormancy strategy was simulated. The results showed that when species differed only in mean dispersal distance, the species with the shorter range dispersal would always displace the other. When disturbances prevented reproduction and activated dormant seeds, then differences in dormancy strategy could result in coexistence of species with different dispersal capabilities. When species differed only in their dormancy fate (i.e., the proportion of dormant seeds produced per year), the range of disturbance intensities allowing coexistence was rather narrow: but differences in the response of species to disturbance (i.e., disturbance-broken seed dormancy versus gradual germination of dormant seeds) allowed coexistence under a wider range of disturbance intensities. These results suggest that differences in the ways species exploit the resources in space and time can mediate coexistence through storage effects. The patterns of coexistence obtained in the simulations were consistent with conclusions of a field study, in species-rich Mediterranean old-fields, about the role for coexistence of the interactions among dispersal and dormancy strategies, spatial heterogeneity, and small-scale disturbances. Coexistence patterns depended on the degree of suitability and the patchiness of the landscapes, mostly in relation to the interactions between landscape structure and mean dispersal distance, but also through complex interactions with dormancy characteristics. Therefore, disturbance regimes are not sufficient for predicting patterns of coexistence, and the unique spatial features of the landscapes need to be taken into account. C1 CNRS,CTR ECOL FONCT & EVOLUT,F-34033 MONTPELLIER,FRANCE. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. NR 105 TC 68 Z9 71 U1 1 U2 14 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0030-1299 J9 OIKOS JI Oikos PD OCT PY 1994 VL 71 IS 1 BP 75 EP 88 DI 10.2307/3546174 PG 14 WC Ecology SC Environmental Sciences & Ecology GA PQ835 UT WOS:A1994PQ83500009 ER PT J AU PAYNE, SA WILKE, GD SMITH, LK KRUPKE, WF AF PAYNE, SA WILKE, GD SMITH, LK KRUPKE, WF TI AUGER UP-CONVERSION LOSSES IN ND-DOPED LASER GLASSES SO OPTICS COMMUNICATIONS LA English DT Article ID MECHANISM; DYNAMICS AB We have measured the Auger upconversion constant, gamma, of Nd3+ ions in phosphate, silicate, and fluoride glasses. The Auger process involves two Nd3+ ions initially in the 4F3/2 metastable state that interact such that one ion is promoted to a higher lying state, while the other is forced to the 4I(J) levels of the ground state. gamma values ranging from 2.6 to 8.1 x 10(-17) cm3 s-1 were measured, depending on the host medium and neodymium concentration. The product of the emission lifetime and the Auger coefficient was found to be in the range of gammatau = (1-2) x 10(-20) cm3 for the materials investigated. This suggests that Auger upconversion is an important problem for excited state densities approaching (5-10)x10(19) cm-3. RP PAYNE, SA (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5508,LIVERMORE,CA 94550, USA. NR 11 TC 51 Z9 51 U1 1 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD OCT 1 PY 1994 VL 111 IS 3-4 BP 263 EP 268 DI 10.1016/0030-4018(94)90463-4 PG 6 WC Optics SC Optics GA PJ455 UT WOS:A1994PJ45500013 ER PT J AU RAYMOND, TD ALFORD, WJ SMITH, AV BOWERS, MS AF RAYMOND, TD ALFORD, WJ SMITH, AV BOWERS, MS TI FREQUENCY-SHIFTS IN INJECTION-SEEDED OPTICAL PARAMETRIC OSCILLATORS WITH PHASE MISMATCH SO OPTICS LETTERS LA English DT Article AB We have observed a frequency shift in the output signal pulses relative to the seed frequency in an injection-seeded, singly resonant, critically phase-matched, pulsed optical parametric oscillator in which phase mismatch was intentionally introduced. The observed shifts can be large compared with the linewidth of the signal pulse, are approximately linear in phase mismatch, and increase with increasing pump fluence. We observe frequency shifts of as much as +/-400 MHz for our 532-nm-pumped, potassium titanyl phosphate ring optical. parametric oscillator. For zero phase mismatch, we observe nearly transform-limited linewidths of less than 130 MHz. We compare the experimental data to a simple analytic model that overestimates the shifts because it ignores pump depletion. We also compare our measurements with a numerical model that calculates the two-dimensional, transient electric fields and the resultant spectral distributions while explicitly including walk-off, diffraction, and pump depletion. We find good agreement between the experimental data and the results of this model. C1 ACULIGHT CORP,BELLEVUE,WA 98005. RP RAYMOND, TD (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 13 TC 25 Z9 25 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD OCT 1 PY 1994 VL 19 IS 19 BP 1520 EP 1522 DI 10.1364/OL.19.001520 PG 3 WC Optics SC Optics GA PJ265 UT WOS:A1994PJ26500006 PM 19855570 ER PT J AU DASILVA, LB LONDON, RA MACGOWAN, BJ MROWKA, S MATTHEWS, DL CRAXTON, RS AF DASILVA, LB LONDON, RA MACGOWAN, BJ MROWKA, S MATTHEWS, DL CRAXTON, RS TI GENERATION OF A 45-PS-DURATION 15.5-NM X-RAY LASER SO OPTICS LETTERS LA English DT Article ID FIELD-INDUCED IONIZATION AB Using a series of 100-ps optical pump pulses; separated by 300 ps, we have produced 45-ps FWHM output pulses in neonlike yttrium operating at a wavelength of 15.5 nm. This is to our knowledge the shortest-pulse collisionally pumped x-ray laser yet produced. The importance of using a traveling-wave pump to increase the output power is also discussed. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. UNIV ROCHESTER, LASER ENERGET LAB, ROCHESTER, NY 14623 USA. RP DASILVA, LB (reprint author), LAWRENCE LIVERMORE NATL LAB, M-S L-476, POB 808, LIVERMORE, CA 94550 USA. NR 20 TC 16 Z9 16 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0146-9592 EI 1539-4794 J9 OPT LETT JI Opt. Lett. PD OCT 1 PY 1994 VL 19 IS 19 BP 1532 EP 1534 DI 10.1364/OL.19.001532 PG 3 WC Optics SC Optics GA PJ265 UT WOS:A1994PJ26500010 PM 19855574 ER PT J AU SULLIVAN, A HAMSTER, H GORDON, SP FALCONE, RW NATHEL, H AF SULLIVAN, A HAMSTER, H GORDON, SP FALCONE, RW NATHEL, H TI PROPAGATION OF INTENSE, ULTRASHORT LASER-PULSES IN PLASMAS SO OPTICS LETTERS LA English DT Article ID IONIZED PLASMAS; IONIZATION; SIMULATIONS AB We have investigated the propagation of terawatt-power laser pulses in gases. The spatial distribution of focused radiation is modified by refraction that results from the spatially inhomogeneous refractive index of the plasma generated by high field ionization. We observe Thomson scattering, stimulated Raman scattering and large wavelength shifting of the laser light. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP SULLIVAN, A (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 14 TC 32 Z9 32 U1 0 U2 4 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD OCT 1 PY 1994 VL 19 IS 19 BP 1544 EP 1546 DI 10.1364/OL.19.001544 PG 3 WC Optics SC Optics GA PJ265 UT WOS:A1994PJ26500014 PM 19855578 ER PT J AU ZOCCO, TG SCHWARTZ, HL AF ZOCCO, TG SCHWARTZ, HL TI MICROSTRUCTURAL ANALYSIS OF BONE OF THE SAUROPOD DINOSAUR SEISMOSAURUS BY TRANSMISSION ELECTRON-MICROSCOPY SO PALAEONTOLOGY LA English DT Article AB Transmission electron microscopy (TEM) is commonly used to characterize materials with respect to crystal structure, chemical composition, defect density and type, as well as other microstructural features. Observation of bone from the Upper Jurassic sauropod dinosaur Seismosaurus using this technique, reveals a unique bimodal crystallite structure which appears to have local preferred orientation. Most crystallites are small oblong grains, averaging approximately 100 nm long and 20 nm wide; larger hexagonal crystallites are also present, ranging from 80 to 400 nm in diameter. The larger crystallites are found near naturally occurring canals and pores in the Seismosaurus bone. Electron diffraction and chemical analyses show that both the small and large crystallites are composed of fluorapatite. Comparative analyses of Seismosaurus with modern crocodile, Pleistocene mammoth, and Cretaceous theropod dinosaur bones show that younger fossil bone microstructure is essentially unaltered; the older fossil bones share a unique crystalline microstructure in which original and diagenetic apatite is intermixed. RP ZOCCO, TG (reprint author), LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,MSG730,LOS ALAMOS,NM 87545, USA. NR 38 TC 30 Z9 30 U1 0 U2 3 PU PALAEONTOLOGICAL ASSOC PI LONDON PA BRIT MUS NAT HIST-DEPT PALAEON CROMWELL RD, LONDON, ENGLAND SW7 5BD SN 0031-0239 J9 PALAEONTOLOGY JI Paleontology PD OCT PY 1994 VL 37 BP 493 EP 503 PN 3 PG 11 WC Paleontology SC Paleontology GA PY969 UT WOS:A1994PY96900003 ER PT J AU CHU, FM LEI, M MIGLIORI, A CHEN, SP MITCHELL, TE AF CHU, FM LEI, M MIGLIORI, A CHEN, SP MITCHELL, TE TI ANOMALOUS ELASTIC PROPERTIES IN A C-15 LAVES-PHASE COMPOUND SO PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES LA English DT Article ID INTERMETALLIC COMPOUNDS; CONSTANTS; DEFORMATION; BEHAVIOR; SYSTEM; SOLIDS; ALLOYS; FIELD AB Low-temperature (70-300 K) elastic constants of a C15 Laves-phase compound Hf25V60Nb15 have been studied using resonant ultrasound spectroscopy. The results show anomalous elastic properties in this intermetallic alloy. The shear modulus and Young's modulus increase with increasing temperature. The bulk modulus is virtually constant in the tested temperature region. The room-temperature shear elastic constants of the alloy are smaller than those of the constituent elements and the average values derived from the rule of mixtures. The room-temperature Poisson's ratio of the alloy is higher than those of the constituent elements. The elastic properties of the C15 compound can be qualitatively understood using the electronic structure obtained from ab-initio calculations. RP CHU, FM (reprint author), LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 50 TC 18 Z9 18 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 0141-8637 J9 PHILOS MAG B JI Philos. Mag. B-Phys. Condens. Matter Stat. Mech. Electron. Opt. Magn. Prop. PD OCT PY 1994 VL 70 IS 4 BP 867 EP 880 DI 10.1080/01418639408240257 PG 14 WC Materials Science, Multidisciplinary; Mechanics; Physics, Applied; Physics, Condensed Matter SC Materials Science; Mechanics; Physics GA PK404 UT WOS:A1994PK40400005 ER PT J AU CHU, FM SOB, M SIEGL, R MITCHELL, TE POPE, DP CHEN, SP AF CHU, FM SOB, M SIEGL, R MITCHELL, TE POPE, DP CHEN, SP TI TOTAL-ENERGY AND ELECTRONIC-STRUCTURE CALCULATIONS OF C-15 LAVES-PHASE COMPOUNDS MV2 (M=ZR, HF OR TA) - ELASTIC PROPERTIES SO PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES LA English DT Article ID INTERMETALLIC COMPOUNDS; ZERO TEMPERATURE; MELTING-POINT; CONSTANTS; ALLOYS; DEFORMATION; MOSI2 AB The total energy and electronic structure of early-transition-metal cubic Laves-phase compounds MV2 (M = Zr, Hf or Ta) have been calculated using the linear muffin-tin orbital method within the local-density and atomic sphere approximations. The elastic properties of the compounds have been examined from these results. The bulk moduli of the cubic MV2 alloys (M = Zr, Hf or Ta) obtained from the total-energy calculations are 162, 172 and 218 GPa respectively. It is found from the electronic structures that there is a double degeneracy of electron energy levels with a linear dispersion relationship in the neighbourhood of the X point of the Brillouin zone and that the Fermi surfaces of the alloys pass near X-point of the Brillouin zone with an energy gap DELTAepsilon. The contribution c44(e) from these electrons to the shear modulus c44 of the alloys, is found to be anomalous at high temperatures (T > 400 K), such that c44(e) increases with increasing temperature. C1 UNIV PENN,DEPT MAT SCI & ENGN,PHILADELPHIA,PA 19104. CZECHOSLOVAK ACAD SCI,INST PHYS MAT,BRNO,CZECH REPUBLIC. RP CHU, FM (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Sob, Mojmir/D-1936-2012; Sob, Mojmir/G-6865-2011 NR 42 TC 23 Z9 24 U1 0 U2 1 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 OCT PY 1994 VL 70 IS 4 BP 881 EP 892 DI 10.1080/01418639408240258 PG 12 WC Materials Science, Multidisciplinary; Mechanics; Physics, Applied; Physics, Condensed Matter SC Materials Science; Mechanics; Physics GA PK404 UT WOS:A1994PK40400006 ER PT J AU YU, N SICKAFUS, KE NASTASI, M AF YU, N SICKAFUS, KE NASTASI, M TI 1ST OBSERVATION OF AMORPHIZATION-J IN SINGLE-CRYSTAL MGAL2O4 SPINEL SO PHILOSOPHICAL MAGAZINE LETTERS LA English DT Article ID IRRADIATION AB We have observed the amorphization of single-crystal MgAl2O4 spinel induced by 400 keV Xe2+-ion irradiation at 100 K to a peak damage level of 25 displacements per atom (dpa). Rutherford backscattering spectrometry combined with ion channelling showed that the amount of radiation damage accumulated with increasing dose and reached a fully random level at a dose of 1 X 10(16) Xe cm-2. Cross-sectional transmission electron microscopy examination of the high-dose sample revealed the presence of a continuous amorphous layer of about 130 nm, followed by a radiation-damaged but crystalline transition layer on the undamaged spinel substrate. The irradiation-damaged crystalline layer is highly defected, and electron diffraction from this region exhibits a decrease in or complete loss of intensity at the spinel (220) reciprocal-lattice positions. These observations suggest that the principal driving force in the amorphization of MgAl2O4 spinel is through the accumulation of chemical disorder (antisite defects) and dislocations (line defects). This is the first experiment where amorphization of spinel is demonstrated. In previous irradiation studies of spinel at elevated temperatures (300-1100 K) up to 250 dpa, no amorphization has ever been observed. RP YU, N (reprint author), LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545, USA. NR 12 TC 77 Z9 77 U1 1 U2 9 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0950-0839 J9 PHIL MAG LETT JI Philos. Mag. Lett. PD OCT PY 1994 VL 70 IS 4 BP 235 EP 240 DI 10.1080/09500839408240980 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA PK401 UT WOS:A1994PK40100008 ER PT J AU TAKAYANAGI, S TRUNK, JG SUTHERLAND, JC SUTHERLAND, BM AF TAKAYANAGI, S TRUNK, JG SUTHERLAND, JC SUTHERLAND, BM TI ALFALFA SEEDLINGS GROWN OUTDOORS ARE MORE RESISTANT TO UV-INDUCED DNA-DAMAGE THAN PLANTS GROWN IN A UV-FREE ENVIRONMENTAL CHAMBER SO PHOTOCHEMISTRY AND PHOTOBIOLOGY LA English DT Article ID PHOTOREACTIVATING ENZYME; NONRADIOACTIVE DNA; PYRIMIDINE DIMERS; STRAND BREAKS; QUANTITATION; ELECTROPHORESIS; RADIATION; GELS AB The relative UV sensitivities of alfalfa seedlings grown outdoors versus plants grown in a growth chamber under UV-filtered cool white fluorescent bulbs have been determined using three criteria: (1) level of endogenous DNA damage as sites for the UV endonuclease from Micrococcus luteus, (2) susceptibility to pyrimidine dimer induction by a UV challenge exposure and (3) ability to repair UV-induced damage. We find that outdoor-grown plants contain approximately equal frequencies of endogenous DNA damages, are less susceptible to dimer induction by a challenge exposure of broad-spectrum UV and photorepair dimers more rapidly than plants grown in an environmental chamber under cool white fluorescent lamps plus a Biter that removes most UV radiation. These data suggest that plants grown in a natural environment would be less sensitive to UVB-induced damage than would be predicted on the basis of studies on plants grown under minimum UV. C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. NR 15 TC 35 Z9 36 U1 0 U2 3 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 OCT PY 1994 VL 60 IS 4 BP 363 EP 367 DI 10.1111/j.1751-1097.1994.tb05116.x PG 5 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA PL411 UT WOS:A1994PL41100010 ER PT J AU VASSILIEV, IR PRASIL, O WYMAN, KD KOLBER, Z HANSON, AK PRENTICE, JE FALKOWSKI, PG AF VASSILIEV, IR PRASIL, O WYMAN, KD KOLBER, Z HANSON, AK PRENTICE, JE FALKOWSKI, PG TI INHIBITION OF PS-II PHOTOCHEMISTRY BY PAR AND UV-RADIATION IN NATURAL PHYTOPLANKTON COMMUNITIES SO PHOTOSYNTHESIS RESEARCH LA English DT Article DE ABSORPTION CROSS SECTION OF PS II; CHLOROPHYLL FLUORESCENCE; PHOTOINHIBITION; PHYTOPLANKTON; Q(A); QUANTUM EFFICIENCY OF PS II; UV RADIATION ID STEADY-STATE PHOTOSYNTHESIS; ULTRAVIOLET-B RADIATION; REACTION CENTER PROTEIN; PHOTOSYSTEM-II; EUKARYOTIC ALGAE; PHOTOINHIBITION; DAMAGE; FLUORESCENCE; IRRADIATION; DEGRADATION AB The effects of PAR and UV radiation on PS II photochemistry were examined in natural phytoplankton communities from coastal waters off Rhode Island (USA) and the subtropical Pacific. The photochemical energy conversion efficiency, the functional absorption cross section and the kinetics of electron transfer on the acceptor side of PS II were derived from variable fluorescence parameters using both pump and probe and fast repetition rate techniques. In both environments, the natural phytoplankton communities displayed marked decreases in PS II photochemical energy conversion efficiency that were correlated with increased PAR. In the coastal waters, the changes in photochemical energy conversion efficiency were not statistically different for samples treated with supplementary UV-B radiation or screened to exclude ambient UV-B. Moreover, no significant light-dependent changes in the functional absorption cross section of PS II were observed. The rate of electron transfer between Q(A)(-) and Q(B) was, however, slightly reduced in photodamaged cells, indicative of damage on the acceptor side. In the subtropical Pacific, the decrease in photochemical energy conversion efficiency was significantly greater for samples exposed to natural levels of UV-A and/or UV-B compared with those exposed to PAR alone. The cells displayed large diurnal changes in the functional absorption cross section of PS II, indicative of non-photochemical quenching in the antenna. The changes in the functional absorption cross section were highly correlated with PAR but independent of UV radiation. The time course of changes in photochemical efficiency reveals that the photoinhibited reaction centers rapidly recover (within an hour or two) to their preillumination values. Thus, while we found definitive evidence for photoinhibition of PS II photochemistry in both coastal and open ocean phytoplankton communities, we did not find any effect of UV-B on the former, but a clear effect on the latter. The results of this study indicate that the effects of W-B radiation on phytoplankton photosynthesis are as dependent on the radiative transfer properties of the water body and the mixing rate, as on the wavelength and energy distribution of the radiation and the absorption cross sections of the biophysical targets. C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV OCEANOG & ATMOSPHER SCI,UPTON,NY 11973. UNIV RHODE ISL,GRAD SCH OCEANOG,NARRAGANSETT,RI 02882. ACAD SCI CZECH REPUBL,INST MICROBIOL,CR-37981 TREBON,CZECH REPUBLIC. RI Prasil, Ondrej/H-2454-2014; Strid, Ake/E-5309-2012 OI Prasil, Ondrej/0000-0002-0012-4359; Strid, Ake/0000-0003-3315-8835 NR 50 TC 57 Z9 57 U1 0 U2 7 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD OCT PY 1994 VL 42 IS 1 BP 51 EP 64 DI 10.1007/BF00019058 PG 14 WC Plant Sciences SC Plant Sciences GA PW970 UT WOS:A1994PW97000007 PM 24307468 ER PT J AU CAI, ZX WELCH, DO AF CAI, ZX WELCH, DO TI A MODEL OF THE CONSECUTIVE STRUCTURAL PHASE-TRANSITIONS IN LA2-XBAXCUO4 SO PHYSICA C LA English DT Article ID LATTICE INSTABILITIES; DOPED LA2CUO4; SUPERCONDUCTIVITY AB A simple lattice-dynamical model is constructed with the parameters chosen to fit the energy surface of the superconducting La2-xBaxCuO4, x approximately 0.1, derived from first-principles calculations. The model possesses many of the features occurring in the consecutive structural phase transitions in solids with the layered perovskite structure. We find that the anharmonicity in the model causes a vibrational-entropy-driven first-order phase transition from the LTT to the LTO structure at low temperatures. The high-temperature LTO to HTT transition is found to be of the order-disorder type and is continous. RP CAI, ZX (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,POB 5000,UPTON,NY 11973, USA. NR 18 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD OCT 1 PY 1994 VL 231 IS 3-4 BP 383 EP 388 DI 10.1016/0921-4534(94)90649-1 PG 6 WC Physics, Applied SC Physics GA PL959 UT WOS:A1994PL95900024 ER PT J AU SMITH, MG WILLIS, JO PETERSON, DE BINGERT, JF PHILLIPS, DS COULTER, JY SALAZAR, KV HULTS, WL AF SMITH, MG WILLIS, JO PETERSON, DE BINGERT, JF PHILLIPS, DS COULTER, JY SALAZAR, KV HULTS, WL TI SYNTHESIS OF AG-CLAD (BI,PB)-2223 TAPES BY AN ALTERNATIVE PRECURSOR ROUTE SO PHYSICA C LA English DT Article ID CU-O SUPERCONDUCTOR; PHASE AB An alternative two-powder process for the synthesis of superconducting (Bi,Pb)-2223/Ag clad wires by the powder-in-the-tube (OPIT) process is described. The first powder, of nominal stoichiometry Bi1.8Pb0.4Sr2CaCu2O8, is a mixture of (Bi,Pb)-2212 and Ca2PbO4. The second powder, of nominal stoichiometry CaCuO2, is a solution-synthesized mixture of Ca0.45Cu0.55O2 and CaO. Using these oxide precursor mixtures, we obtain tapes with well-aligned grains, and reproducible critical current densities J(c) in the range of 20 000-26 000 A/cm2 at 75 K in self-field after anneals at 815-degrees-C in 10% O2 in less than 200 h. The decrease in annealing time, relative to other two-powder processes, may be due to the increase in reactivity and possible reaction paths of the Ca0.45Cu0.55O2 precursor. Results on tapes prepared using other processing conditions are also reported. C1 LOS ALAMOS NATL LAB,DIV MAT,LOS ALAMOS,NM 87544. RP SMITH, MG (reprint author), LOS ALAMOS NATL LAB,CTR SUPERCOND TECHNOL,LOS ALAMOS,NM 87544, USA. NR 15 TC 14 Z9 14 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 OCT 1 PY 1994 VL 231 IS 3-4 BP 409 EP 415 DI 10.1016/0921-4534(94)90652-1 PG 7 WC Physics, Applied SC Physics GA PL959 UT WOS:A1994PL95900027 ER PT J AU KRISTIANSSON, JE AF KRISTIANSSON, JE TI TESTS OF A NEW CLOUD TREATMENT IN AN ATMOSPHERIC GENERAL-CIRCULATION MODEL SO PHYSICA D LA English DT Article; Proceedings Paper CT 13th Annual International Conference of the Center-for-Nonlinear-Studies CY MAY 17-21, 1993 CL LOS ALAMOS, NM SP LOS ALAMOS NATL LAB, CTR NONLINEAR STUDIES ID CUMULUS CONVECTION; PARAMETERIZATION; FEEDBACK; CLIMATE; CONDENSATION; PREDICTION AB In this study we present a new cloud treatment in an atmospheric climate model. The water (or ice) content of clouds is introduced as a prognostic variable, subject to both advective and diffusive transport. In the first phase of the study, the cloud water does not affect the radiative properties of clouds. We then find differences in precipitation and cloud fields, but little effect on the overall climate. In the second phase the cloud water determines the optical properties of clouds. This enhances the non-linear interactions between the model's dynamics and physical processes. As a third step the cloud fraction formulation is modified. Through these changes the model's radiative budget is brought quite close to the observed. C1 LOS ALAMOS NATL LAB,DIV EARTH & ENVIRONM SCI,LOS ALAMOS,NM 87545. 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 0167-2789 J9 PHYSICA D JI Physica D PD OCT 1 PY 1994 VL 77 IS 1-3 BP 23 EP 32 DI 10.1016/0167-2789(94)90125-2 PG 10 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA PJ981 UT WOS:A1994PJ98100003 ER PT J AU WINSKE, D HESSE, M AF WINSKE, D HESSE, M TI HYBRID MODELING OF MAGNETIC RECONNECTION IN-SPACE PLASMAS SO PHYSICA D LA English DT Article; Proceedings Paper CT 13th Annual International Conference of the Center-for-Nonlinear-Studies CY MAY 17-21, 1993 CL LOS ALAMOS, NM SP LOS ALAMOS NATL LAB, CTR NONLINEAR STUDIES ID SIMULATIONS; INSTABILITIES; MAGNETOTAIL; MECHANISM AB Reconnection of magnetic fields is one of the most fundamental and important transport processes in plasma physics, being a very efficient mechanism for converting magnetic field energy into particle energy. In this paper we investigate reconnection using two-dimensional hybrid simulations, in which the ions are treated kinetically and the electrons as a massless fluid. We discuss the details of the model, the need to include the complete electron pressure tenser, and issues associated with numerical implementation. We describe the results of simulations showing the Linear growth of the collisionless ion tearing mode in a neutral sheet configuration and its subsequent nonlinear development. The consequences of reconnection for magnetospheric physics are also briefly discussed. C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RP WINSKE, D (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Hesse, Michael/D-2031-2012 NR 22 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD OCT 1 PY 1994 VL 77 IS 1-3 BP 268 EP 275 DI 10.1016/0167-2789(94)90139-2 PG 8 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA PJ981 UT WOS:A1994PJ98100017 ER PT J AU JARZYNSKI, C AF JARZYNSKI, C TI CHAOTIC ADIABATIC ENERGY DIFFUSION AND THE FERMI MECHANISM SO PHYSICA D LA English DT Article; Proceedings Paper CT 13th Annual International Conference of the Center-for-Nonlinear-Studies CY MAY 17-21, 1993 CL LOS ALAMOS, NM SP LOS ALAMOS NATL LAB, CTR NONLINEAR STUDIES ID INVARIANTS; DYNAMICS; SYSTEMS AB Energy diffusion in chaotic adiabatic systems is illustrated with a model depicting the Fermi mechanism for cosmic ray acceleration. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RI Jarzynski, Christopher/B-4490-2009 OI Jarzynski, Christopher/0000-0002-3464-2920 NR 18 TC 1 Z9 1 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD OCT 1 PY 1994 VL 77 IS 1-3 BP 276 EP 288 DI 10.1016/0167-2789(94)90140-6 PG 13 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA PJ981 UT WOS:A1994PJ98100018 ER PT J AU BENZ, W COLGATE, SA HERANT, M AF BENZ, W COLGATE, SA HERANT, M TI SUPERNOVA EXPLOSIONS AND HYDRODYNAMICAL INSTABILITIES - FROM CORE BOUNCE TO 90 DAYS SO PHYSICA D LA English DT Article; Proceedings Paper CT 13th Annual International Conference of the Center-for-Nonlinear-Studies CY MAY 17-21, 1993 CL LOS ALAMOS, NM SP LOS ALAMOS NATL LAB, CTR NONLINEAR STUDIES ID SN-1987A; CONVECTION; DISCOVERY; EMISSION AB Since the advent of SN 1987A, considerable progress has been made in our understanding of supernova explosions. It is now realized that they are intrinsically multidimensional in nature due to the various hydrodynamical instabilities which take place at almost all stages of the explosion. These instabilities not only modify the observables from the supernova, but are also thought to be at the heart of the supernova mechanism itself, in a way which provides robust and self-regulated explosions. In this paper, we review these instabilities placing them into their appropriate context and identifying their role in the genesis of core-collapse supernovae. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV CALIF SANTA CRUZ,LICK OBSERV,SANTA CRUZ,CA 95064. RP BENZ, W (reprint author), UNIV ARIZONA,STEWARD OBSERV,TUCSON,AZ 85721, USA. NR 34 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD OCT 1 PY 1994 VL 77 IS 1-3 BP 305 EP 319 DI 10.1016/0167-2789(94)90142-2 PG 15 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA PJ981 UT WOS:A1994PJ98100020 ER PT J AU CAMASSA, R HYMAN, JM NEWMAN, WI AF CAMASSA, R HYMAN, JM NEWMAN, WI TI MODELING THE FORCES OF NATURE - SPECIAL ISSUE ORIGINATING FROM THE 13TH ANNUAL INTERNATIONAL-CONFERENCE OF THE CENTER FOR NONLINEAR STUDIES LOS-ALAMOS, NM, USA, 17-21 MAY 1993 SO PHYSICA D LA English DT Editorial Material C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV CALIF LOS ANGELES,DEPT EARTH & SPACE SCI,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,DEPT ASTRON,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,DEPT MATH,LOS ANGELES,CA 90024. RP CAMASSA, R (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD OCT 1 PY 1994 VL 77 IS 1-3 BP R7 EP R8 DI 10.1016/0167-2789(94)90123-6 PG 2 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA PJ981 UT WOS:A1994PJ98100001 ER PT J AU COMMINS, ED ROSS, SB DEMILLE, D REGAN, BC AF COMMINS, ED ROSS, SB DEMILLE, D REGAN, BC TI IMPROVED EXPERIMENTAL LIMIT ON THE ELECTRIC-DIPOLE MOMENT OF THE ELECTRON SO PHYSICAL REVIEW A LA English DT Article ID T-ODD; CP-VIOLATION; NUCLEON INTERACTIONS; THALLIUM; NEUTRON; SEARCH; CESIUM; ATOMS AB New results are reported in our search for the electric dipole moment d(e) of the electron in the ground 6P-1/2(2) state of Tl-205. The atomic-beam magnetic resonance method is employed with separated oscillating fields. A magnetic field B defines the axis of quantization, and an electric field E, parallel to B, is applied in the region between the oscillating fields. Laser optical pumping is used for state selection and analysis, and the signal is fluorescence accompanying the decay of excited atoms in the analyzer region. The signature of a nonzero electric dipole moment is a dependence of the signal on the P, T-odd rotational invariant E.B (P and T denote parity and time reversal, respectively). Two counterpropagating atomic beams are employed to reduce a systematic effect due to the motional magnetic field E X v/c. Auxiliary experiments are performed to isolate and eliminate residual sources of systematic error. The result is d(e) = [1.8+/-1.2(statistical)+/-1.0(systematic)] X 10(-27) e cm. A detailed discussion is given of the experimental method, sources of systematic error and their elimination, and results. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP COMMINS, ED (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 40 TC 268 Z9 269 U1 0 U2 9 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 OCT PY 1994 VL 50 IS 4 BP 2960 EP 2977 DI 10.1103/PhysRevA.50.2960 PG 18 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA PL627 UT WOS:A1994PL62700031 ER PT J AU LERNER, PB LAGATTUTA, K COHEN, JS AF LERNER, PB LAGATTUTA, K COHEN, JS TI IONIZATION OF HE BY ULTRASTRONG SINGLE-CYCLE PULSES SO PHYSICAL REVIEW A LA English DT Article ID ABOVE-THRESHOLD IONIZATION; ELECTROMAGNETIC PULSES AB Recently, the progress of experimental techniques has allowed the realization of less-than-a-cycle pulses. Though these pulses are as yet too weak to ionize atoms from the ground state, the rapid progress in experimental methods warrants the investigation of possibilities opened up by these new achievements. In this paper we use the quasiclassical Fermi molecular-dynamics method to study the dynamics of ionization and the electron correlations of initially ground-state He atoms in single-cycle infrared pulses. An interpretation is also made in terms of a quasistatic ionization model. RP LERNER, PB (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. OI Lerner , Peter/0000-0002-3086-0170 NR 10 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD OCT PY 1994 VL 50 IS 4 BP 3245 EP 3248 DI 10.1103/PhysRevA.50.3245 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA PL627 UT WOS:A1994PL62700062 ER PT J AU ANDERSSON, L BURGDORFER, J AF ANDERSSON, L BURGDORFER, J TI EXCITATION-IONIZATION AND DOUBLE-IONIZATION OF HELIUM BY COMPTON-SCATTERING SO PHYSICAL REVIEW A LA English DT Note ID TO-SINGLE PHOTOIONIZATION; HIGH-ENERGY PHOTON; SYNCHROTRON-RADIATION; ELECTRONS; RATIO AB We investigate the behavior of the cross section for inelastic photon scattering in the limit of high but nonrelativistic photon energies omega --> infinity at helium leading to two-electron transitions. Our calculation employs fully correlated wave functions for the helium ground state and different forms for approximate two-electron final states. We determine the omega --> infinity limit for the ratio of double to single ionization. We find the high-energy behavior to differ significantly from the one for photoabsorption. Our results confirm our previous estimate [Andersson and Burgdorfer, Phys. Rev. Lett. 71, 50 (1993)] but disagree with recent predictions by Hino et al. [Phys. Rev. Lett. 72, 1620 (1994)]. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 32 TC 56 Z9 56 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD OCT PY 1994 VL 50 IS 4 BP R2810 EP R2813 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA PL627 UT WOS:A1994PL62700004 ER PT J AU SUNDSTROM, G DATZ, S MOWAT, JR MANNERVIK, S BROSTROM, L CARLSON, M DANARED, H LARSSON, M AF SUNDSTROM, G DATZ, S MOWAT, JR MANNERVIK, S BROSTROM, L CARLSON, M DANARED, H LARSSON, M TI DIRECT DISSOCIATIVE RECOMBINATION OF GROUND-STATE HEH+ SO PHYSICAL REVIEW A LA English DT Note ID STORAGE RING AB (HeH+)-He-3 molecular ions have been stored in an ion storage ring and allowed to interact with electrons from an electron cooler. Neutral reaction products have been counted and an absolute cross section for dissociative recombination has been measured. The spectrum reveals a prominent peak at about 18 eV and a weaker one at about 30 eV. The origin of the low-energy dissociative recombination of (HeH+)-He-3 is discussed, and the mechanism responsible for the high-energy peak is modeled by calculating the vibrational overlap between the ground state of the molecular ion and several repulsive states. It is concluded that ions populate primarily the singlet electronic ground state, and that the peaks at 18 and 30 eV arise predominantly from direct dissociative recombination of vibrationally cold (HeH+)-He-3. C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. N CAROLINA STATE UNIV,DEPT PHYS,RALEIGH,NC 27695. UNIV STOCKHOLM,MANNE SIEGBAHN LAB,S-10405 STOCKHOLM,SWEDEN. RP SUNDSTROM, G (reprint author), ROYAL INST TECHNOL,DEPT PHYS 1,S-10044 STOCKHOLM 70,SWEDEN. NR 30 TC 35 Z9 35 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD OCT PY 1994 VL 50 IS 4 BP R2806 EP R2809 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA PL627 UT WOS:A1994PL62700003 ER PT J AU BIRTCHER, RC GRIMSDITCH, MH MCNEIL, LE AF BIRTCHER, RC GRIMSDITCH, MH MCNEIL, LE TI STRUCTURAL AND ELASTIC PROPERTIES OF GE AND KR-ION IRRADIATION AT ROOM-TEMPERATURE SO PHYSICAL REVIEW B LA English DT Article ID AMORPHIZATION; TRANSFORMATION; INSTABILITY; RADIATION; GERMANIUM; BEHAVIOR; DAMAGE; ZIRCON AB Changes in the elastic properties of Ge induced by room-temperature irradiation with 3.5-MeV Kr ions have been determined and correlated with changes in the microstructure determined by transmission electron microscopy. Elastic-shear-moduli changes were measured by Brillouin scattering, and changes in local atomic arrangement were determined by Raman scattering. Amorphization decreased the elastic shear modulus of Ge by 17%. The fractional decrease was correlated with the amorphous volume fraction with a cross section of 4.5 +/- 0.5 nm2/ion. No change was observed in the shear modulus during void formation and growth. The elastic properties of the voided material are described by the Voigt averaging. However, as the voids evolved into a fibrous spongelike microstructure, a second dramatic elastic softening occurrs which we attribute to the inability of the fibrous structure to support shear stresses. Raman scattering showed that, once formed, there was no change in the structure of the amorphous material at the atomic scale during void formation and subsequent void coalescence. C1 UNIV N CAROLINA,DEPT PHYS & ASTRON,CHAPEL HILL,NC 27599. RP BIRTCHER, RC (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 23 TC 8 Z9 8 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1994 VL 50 IS 13 BP 8990 EP 8995 DI 10.1103/PhysRevB.50.8990 PG 6 WC Physics, Condensed Matter SC Physics GA PL412 UT WOS:A1994PL41200002 ER PT J AU KWON, I KRESS, JD COLLINS, LA AF KWON, I KRESS, JD COLLINS, LA TI TIGHT-BINDING MODELS FOR HOT DENSE HYDROGEN SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-DYNAMICS; METALLIC HYDROGEN; PLASMAS; MATTER; FUSION AB In order to understand the structure and dynamics of hot dense hydrogen, a tight-binding model for hydrogen is developed by fitting the energies of the hydrogen molecule and various crystal structures of solid hydrogen. Pair correlation functions and self-diffusion coefficients obtained from tight-binding molecular-dynamics simulations on relatively large systems for long time scales compare very well with density-functional molecular-dynamics results at various densities (0.1-3 g cm-3) and temperatures (0.1-5 eV). RP KWON, I (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 29 TC 31 Z9 31 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1994 VL 50 IS 13 BP 9118 EP 9123 DI 10.1103/PhysRevB.50.9118 PG 6 WC Physics, Condensed Matter SC Physics GA PL412 UT WOS:A1994PL41200018 ER PT J AU CABLE, JW TSUNODA, Y AF CABLE, JW TSUNODA, Y TI MAGNETIC SHORT-RANGE ORDER AND MAGNETIC-MOMENTS OF CO-MN AND NI-MN ALLOYS SO PHYSICAL REVIEW B LA English DT Article ID POLARIZATION-ANALYSIS; MANGANESE; NEUTRON; BCC AB The magnetic behavior of Co-Mn and Ni-Mn alloys is typical of competing interaction systems with regions of ferromagnetism and antiferromagnetism enclosing an intermediate concentration region in which only magnetic short-range order (MSRO) occurs. Neutron diffuse scattering measurements were made on alloys from this intermediate region to characterize the MSRO and to determine the associated magnetic moments. Diffuse peaks indicative of antiferromagnetic short-range order were observed and average sublattice moments were determined by comparison of the integrated diffuse peak intensities with the cross section for Bragg scattering from the alloys with assumed antiferromagnetic long-range order. The average sublattice moment of the Co-Mn alloys is appreciably smaller than that for the Ni-Mn alloys. Recent local density calculations indicate vanishing moments for Ni and Co atoms in fcc antiferromagnets with large wave vectors. If this applies to these alloys, then all of the moment resides at the Mn sites and corresponds to about 1mu(B)/Mn for the Co-Mn alloys and 4mu(B)/Mn for Ni-Mn alloys. This moment difference for these otherwise similar systems is attributed to a moment-volume instability of the type more commonly associated with fcc Fe. C1 OSAKA UNIV,TOYONAKA,OSAKA 560,JAPAN. RP CABLE, JW (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 21 TC 15 Z9 15 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1994 VL 50 IS 13 BP 9200 EP 9207 DI 10.1103/PhysRevB.50.9200 PG 8 WC Physics, Condensed Matter SC Physics GA PL412 UT WOS:A1994PL41200027 ER PT J AU TRYGG, J WILLS, J JOHANSSON, B ERIKSSON, O AF TRYGG, J WILLS, J JOHANSSON, B ERIKSSON, O TI FIELD-INDUCED MAGNETISM IN URANIUM-COMPOUNDS - UGE3 AND URH3 SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIZATION DENSITY; ELECTRONIC-STRUCTURE; BRILLOUIN-ZONE; SPECIAL POINTS; BAND THEORY; SYSTEMS; HYBRIDIZATION; UPD3 AB The field-induced magnetism in UGe3 and URh3 has been studied by means of first-principles calculations. The calculated-induced moments on the U and Rh sites agree well with experimental work on URh3. Also, the calculated field-induced magnetic form factor of URh3 compares favorably with experiment. In the case of UGe3 the agreement between theory and experiment is less satisfactory. Even though the calculated induced moment on the U site is rather close to measurement, the calculated Ge moment is substantially smaller than derived experimentally. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP TRYGG, J (reprint author), UNIV UPPSALA,DEPT PHYS,CONDENSED MATTER THEORY GRP,BOX 530,S-75105 UPPSALA,SWEDEN. RI Eriksson, Olle/E-3265-2014 OI Eriksson, Olle/0000-0001-5111-1374 NR 25 TC 11 Z9 11 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1994 VL 50 IS 13 BP 9226 EP 9234 DI 10.1103/PhysRevB.50.9226 PG 9 WC Physics, Condensed Matter SC Physics GA PL412 UT WOS:A1994PL41200030 ER PT J AU CLEM, JR SANCHEZ, A AF CLEM, JR SANCHEZ, A TI HYSTERETIC AC LOSSES AND SUSCEPTIBILITY OF THIN SUPERCONDUCTING DISKS SO PHYSICAL REVIEW B LA English DT Article ID II SUPERCONDUCTORS; TRANSPORT CURRENTS; MAGNETIC-FIELD; FILMS AB We calculate hysteretic magnetization curves and ac-susceptibility components chi'(n) and chi''(n) for n = 1, 3, and 5 for a type-II superconducting thin circular disk subjected to a low-frequency oscillating applied field, extending previous approaches for calculating hysteretic current-density and magnetic flux-density profiles in the critical state. We also present limiting expressions for chi' = chi'1 and chi'' = chi''1 for both small and large values of the ac field amplitude, and we show how chi'' is simply related to the ac loss per cycle per unit volume. Finally, a comparison is made between our results and those obtained for slab and strip geometries. C1 IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS, AMES, IA 50011 USA. Univ Autonoma Barcelona, Dept Fis, E-08193 Barcelona, SPAIN. RP CLEM, JR (reprint author), IOWA STATE UNIV SCI & TECHNOL, US DOE, AMES LAB, AMES, IA 50011 USA. RI Sanchez, Alvaro/C-7041-2008; OI Sanchez, Alvaro/0000-0002-2988-0289 NR 22 TC 336 Z9 337 U1 3 U2 26 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1994 VL 50 IS 13 BP 9355 EP 9362 DI 10.1103/PhysRevB.50.9355 PG 8 WC Physics, Condensed Matter SC Physics GA PL412 UT WOS:A1994PL41200045 ER PT J AU RADTKE, RJ NORMAN, MR AF RADTKE, RJ NORMAN, MR TI RELATION OF EXTENDED VANHOVE SINGULARITIES TO HIGH-TEMPERATURE SUPERCONDUCTIVITY WITHIN STRONG-COUPLING THEORY SO PHYSICAL REVIEW B LA English DT Article ID DEPENDENT ELECTRONIC DENSITY; HIGH-TC SUPERCONDUCTIVITY; NORMAL-STATE PROPERTIES; VANHOVE SINGULARITIES; ENERGY-DEPENDENCE; CU OXIDES; OF-STATES; GAP AB Recent angle-resolved photoemission (ARPES) experiments have indicated that the electronic dispersion in some of the cuprates possesses an extended saddle point near the Fermi level which gives rise to a density of states that diverges like a power law instead of the weaker logarithmic divergence usually considered. We investigate whether this strong singularity can give rise to high transition temperatures by computing the critical temperature T(c) and isotope effect coefficient alpha within a strong-coupling Eliashberg theory which accounts for the full energy variation of the density of states. Using band structures extracted from ARPES measurements, we demonstrate that, while the weak-coupling solutions suggest a strong influence of the strength of the Van Hove singularity on T(c) and alpha, strong-coupling solutions show less sensitivity to the singularity strength and do not support the hypothesis that band-structure effects alone can account for either the large T(c)'s or the different T(c)'s within the copper oxide family. This conclusion is supported when our results are plotted as a function of the physically relevant self-consistent coupling constant, which shows universal behavior at very strong coupling. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. UNIV CHICAGO,JAMES FRANCK INST,CHICAGO,IL 60637. RP RADTKE, RJ (reprint author), UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637, USA. RI Norman, Michael/C-3644-2013 NR 43 TC 57 Z9 57 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1994 VL 50 IS 13 BP 9554 EP 9560 DI 10.1103/PhysRevB.50.9554 PG 7 WC Physics, Condensed Matter SC Physics GA PL412 UT WOS:A1994PL41200071 ER PT J AU FELCHER, GP GOYETTE, RJ ANASTASIADIS, S RUSSELL, TP FOSTER, M BATES, F AF FELCHER, GP GOYETTE, RJ ANASTASIADIS, S RUSSELL, TP FOSTER, M BATES, F TI TOPOLOGY OF FORWARD SCATTERING OF NEUTRONS FROM IMPERFECT MULTILAYERS SO PHYSICAL REVIEW B LA English DT Note ID X-RAY-DIFFRACTION; INTERFACIAL ROUGHNESS; DIBLOCK COPOLYMERS; REFLECTIVITY; SURFACES AB Neutrons sent at grazing incidence on imperfect multilayers of polymers are scattered both out of and within the plane of reflection. In the latter geometry the scattered intensity is highly structured in two series of ridges, whose loci can be labeled in terms of the neutron momenta. Intersecting ridges show evidence of mode coupling. Similar topology is expected for x-ray scattering. C1 IBM CORP,ALMADEN RES CTR,SAN JOSE,CA 95120. UNIV MINNESOTA,DEPT CHEM ENGN,MINNEAPOLIS,MN 55455. RP FELCHER, GP (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI Anastasiadis, Spiros/D-2778-2009; OI Anastasiadis, Spiros/0000-0003-0936-1614; Bates, Frank/0000-0003-3977-1278 NR 20 TC 8 Z9 9 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 OCT 1 PY 1994 VL 50 IS 13 BP 9565 EP 9568 DI 10.1103/PhysRevB.50.9565 PG 4 WC Physics, Condensed Matter SC Physics GA PL412 UT WOS:A1994PL41200073 ER PT J AU ROBINSON, RA PURWANTO, A KOHGI, M CANFIELD, PC KAMIYAMA, T ISHIGAKI, T LYNN, JW ERWIN, R PETERSON, E MOVSHOVICH, R AF ROBINSON, RA PURWANTO, A KOHGI, M CANFIELD, PC KAMIYAMA, T ISHIGAKI, T LYNN, JW ERWIN, R PETERSON, E MOVSHOVICH, R TI CRYSTALLOGRAPHY AND MAGNETISM OF THE HEAVY-FERMION COMPOUND YBBIPT SO PHYSICAL REVIEW B LA English DT Note AB The super-heavy-fermion compound YbBiPt has the largest known linear specific-heat coefficient gamma = 8 J mol-1 K-2, and the source of this enormous ''electronic'' specific heat is of great current interest. Here we describe neutron-diffraction studies that indicate its previously reported crystallographic structure to be incorrect. We find that the Pt atom is on the unique site and can be thought of as an interstitial in a fictitious rock-salt structure YbBi, which can in turn be thought of as an ordered form of elemental bismuth. We find no evidence of disorder between sites, occupancy on the nominally vacant site, nor for any tetragonal or rhombohedral distortions or displacements. Furthermore, any ordered magnetic moment at low temperature must be less than 0.25mu(B). The sample contains 8.1 wt.% elemental Bi, and if this is typical of other samples, the previously published values for molar susceptibilities and specific heats should be scaled up by this amount to obtain the intrinsic properties of YbBiPt alone. C1 NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. NEW MEXICO STATE UNIV,LAS CRUCES,NM 88003. TOHOKU UNIV,DEPT PHYS,SENDAI,MIYAGI 980,JAPAN. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. UNIV TSUKUBA,INST MAT SCI,TSUKUBA 305,JAPAN. NATL INST STAND & TECHNOL,DIV REACTOR RADIAT,GAITHERSBURG,MD 20899. RP ROBINSON, RA (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Canfield, Paul/H-2698-2014 NR 18 TC 27 Z9 27 U1 2 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1994 VL 50 IS 13 BP 9595 EP 9598 DI 10.1103/PhysRevB.50.9595 PG 4 WC Physics, Condensed Matter SC Physics GA PL412 UT WOS:A1994PL41200081 ER PT J AU KAO, CC CHEN, CT JOHNSON, ED HASTINGS, JB LIN, HJ HO, GH MEIGS, G BROT, JM HULBERT, SL IDZERDA, YU VETTIER, C AF KAO, CC CHEN, CT JOHNSON, ED HASTINGS, JB LIN, HJ HO, GH MEIGS, G BROT, JM HULBERT, SL IDZERDA, YU VETTIER, C TI DICHROIC INTERFERENCE EFFECTS IN CIRCULARLY-POLARIZED SOFT-X-RAY RESONANT MAGNETIC SCATTERING SO PHYSICAL REVIEW B LA English DT Note ID EXCHANGE SCATTERING; ABSORPTION; EDGES; MONOCHROMATORS; MULTILAYERS; ATOMS; IRON; FE AB Dichroic interference effects were observed in circularly polarized soft-x-ray reflectivity at the Co L2,3 edges of a magnetic multilayer. The data show a maximum asymmetry ratio of 80%, greater than the degree of circular polarization of the incident light, a changeover in the dichroic characteristics with increasing grazing angle, and an inverted interference pattern in the angular dependence of the asymmetry ratio. These observations are explained successfully by a classical electromagnetic model calculation which includes the complete polarization state of the incident light and spatial interference within the multilayer. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. USN,RES LAB,WASHINGTON,DC 20375. EUROPEAN SYNCHROTRON RADIAT FACIL,F-38043 GRENOBLE,FRANCE. RP KAO, CC (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 30 TC 116 Z9 118 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1994 VL 50 IS 13 BP 9599 EP 9602 DI 10.1103/PhysRevB.50.9599 PG 4 WC Physics, Condensed Matter SC Physics GA PL412 UT WOS:A1994PL41200082 ER PT J AU CAI, D SANCHEZ, A BISHOP, AR FALO, F FLORIA, LM AF CAI, D SANCHEZ, A BISHOP, AR FALO, F FLORIA, LM TI POSSIBLE SOLITON MOTION IN AC-DRIVEN DAMPED NONLINEAR LATTICES SO PHYSICAL REVIEW B LA English DT Note ID CHAIN AB We study the possibility of kink motion induced by pure ac driving in damped nonlinear lattices, focusing on the Frenkel-Kontorova and Toda models. Numerical simulations of the Frenkel-Kontorova model show no evidence for steady kink motion. We point out that momentum-balance in addition to energy-balance arguments are needed to understand the translation of the collective excitation. Finally, our result is discussed in view of related theoretical predictions and numerical simulations. C1 LOS ALAMOS NATL LAB, CTR NONLINEAR STUDIES, LOS ALAMOS, NM 87545 USA. UNIV CARLOS 3, ESCUELA POLITECN SUPER, E-28911 LEGANES, SPAIN. UNIV ZARAGOZA, CSIC, INST CIENCIA MAT ARAGON, E-50009 ZARAGOZA, SPAIN. RP CAI, D (reprint author), LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. RI Sanchez, Angel/A-9229-2008; Falo, Fernando/B-9137-2011; Floria, Luis Mario/L-7261-2014 OI Sanchez, Angel/0000-0003-1874-2881; Falo, Fernando/0000-0002-9551-624X; Floria, Luis Mario/0000-0002-1406-8810 NR 21 TC 10 Z9 10 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1994 VL 50 IS 13 BP 9652 EP 9655 DI 10.1103/PhysRevB.50.9652 PG 4 WC Physics, Condensed Matter SC Physics GA PL412 UT WOS:A1994PL41200097 ER PT J AU KADUWELA, AP WANG, Z THEVUTHASAN, S VANHOVE, MA FADLEY, CS AF KADUWELA, AP WANG, Z THEVUTHASAN, S VANHOVE, MA FADLEY, CS TI IMAGING SHORT-RANGE MAGNETIC ORDER BY SPIN-POLARIZED PHOTOELECTRON HOLOGRAPHY SO PHYSICAL REVIEW B LA English DT Note ID ELECTRON-EMISSION HOLOGRAPHY; MULTIPLE-SCATTERING; DIFFRACTION; PHOTOEMISSION; MNO(001) AB We extend spin-polarized photoelectron diffraction to the direct imaging of magnetic spin configurations by using holographic-inversion methods. Theoretical calculations for Mn2+ and O2- ions in linear chains show that it is possible via two different spin-selective image functions to determine both the positions and orientations of magnetic scatterers relative to a given type of emitter. Such holographic images thus should provide direct information on short-range magnetic spin configurations near surfaces. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP KADUWELA, AP (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Van Hove, Michel/A-9862-2008; OI Van Hove, Michel/0000-0002-8898-6921; Kaduwela, Ajith/0000-0002-7236-2698 NR 30 TC 10 Z9 10 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 OCT 1 PY 1994 VL 50 IS 13 BP 9656 EP 9659 DI 10.1103/PhysRevB.50.9656 PG 4 WC Physics, Condensed Matter SC Physics GA PL412 UT WOS:A1994PL41200098 ER PT J AU GOLDMAN, AI STASSIS, C CANFIELD, PC ZARESTKY, J DERVENAGAS, P CHO, BK JOHNSTON, DC AF GOLDMAN, AI STASSIS, C CANFIELD, PC ZARESTKY, J DERVENAGAS, P CHO, BK JOHNSTON, DC TI MAGNETIC PAIR-BREAKING IN HONI2B2C SO PHYSICAL REVIEW B LA English DT Note AB Neutron-diffraction techniques have been used to study the interplay between superconductivity and magnetism in HoNi2B2C (T(c) = 8 K). The experimental results, obtained on single crystals, show that below approximately 4.7 K, this compound is in a simple antiferromagnetic state that coexists with superconductivity. Between approximately 4.7 and 6 K, an incommensurate modulated magnetic structure has been found. This observation strongly suggests that pair breaking associated with this incommensurate magnetic structure is responsible for the deep minimum in H(c2) and the near-reentrant behavior observed in this compound at approximately 5 K. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP GOLDMAN, AI (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Canfield, Paul/H-2698-2014 NR 22 TC 180 Z9 181 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1994 VL 50 IS 13 BP 9668 EP 9671 DI 10.1103/PhysRevB.50.9668 PG 4 WC Physics, Condensed Matter SC Physics GA PL412 UT WOS:A1994PL41200101 ER PT J AU THOUVENOT, P HUBERT, S EDELSTEIN, N AF THOUVENOT, P HUBERT, S EDELSTEIN, N TI SPECTROSCOPIC STUDY AND CRYSTAL-FIELD ANALYSIS OF CM3+ IN THE CUBIC-SYMMETRY SITE OF THO2 SO PHYSICAL REVIEW B LA English DT Article AB Fluorescence and excitation spectra of Cm3+ diluted in ThO2 powder are reported at room and low temperatures. The observed Cm3+ spectra are from the cubic symmetry lattice site and are assigned to phonon-assisted electric dipole transitions and to magnetic dipole transitions. From these assignments, the crystal-field parameters B-0(4) = -6436 cm-1 and B-0(6) = 1195 cm-1 have been determined. The experimental energy levels for the ground term (approximately 80% S-8(7/2)) determined from the optical data and earlier electron paramagnetic resonance spectra are in good agreement with the calculated values. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP THOUVENOT, P (reprint author), INST PHYS NUCL LYON,RADIOCHIM LAB,BOITE POSTALE 1,F-91406 ORSAY,FRANCE. NR 12 TC 21 Z9 21 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1994 VL 50 IS 14 BP 9715 EP 9720 DI 10.1103/PhysRevB.50.9715 PG 6 WC Physics, Condensed Matter SC Physics GA PL951 UT WOS:A1994PL95100001 ER PT J AU TIKOFSKY, AM LAUGHLIN, RB AF TIKOFSKY, AM LAUGHLIN, RB TI RESPONSE FUNCTION OF THE T-J MODEL CALCULATED USING ANYON TECHNIQUES SO PHYSICAL REVIEW B LA English DT Article ID FRACTIONAL-STATISTICS GAS; CHIRAL-SPIN-LIQUID; RANDOM-PHASE APPROXIMATION; TIME-REVERSAL-SYMMETRY; NONRECIPROCAL CIRCULAR BIREFRINGENCE; HIGH-TEMPERATURE SUPERCONDUCTORS; QUANTIZED HALL CONDUCTANCE; MAGNETIC PENETRATION DEPTH; COMMENSURATE FLUX PHASE; VALENCE-BOND STATE AB We have computed zero-temperature properties of the t-J Hamiltonian using the formalism of anyon superconductivity. The results of these calculations agree quantitatively with exact-diagonalization studies. These properties include the optical conductivity, the ground-state kinetic energy, and the ground-state magnetic energy. Implicit in this calculational procedure is a Kosterlitz-Thouless transition temperature for the onset of superconductivity. C1 STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 73 TC 14 Z9 14 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 OCT 1 PY 1994 VL 50 IS 14 BP 10165 EP 10189 DI 10.1103/PhysRevB.50.10165 PG 25 WC Physics, Condensed Matter SC Physics GA PL951 UT WOS:A1994PL95100056 ER PT J AU BARON, AQR ARTHUR, J RUBY, SL CHUMAKOV, AI SMIRNOV, GV BROWN, GS AF BARON, AQR ARTHUR, J RUBY, SL CHUMAKOV, AI SMIRNOV, GV BROWN, GS TI ANGULAR-DEPENDENCE OF SPECULAR RESONANT NUCLEAR-SCATTERING OF X-RAYS SO PHYSICAL REVIEW B LA English DT Note ID TOTAL-EXTERNAL-REFLECTION; SYNCHROTRON RADIATION; BRAGG SCATTERING; DIFFRACTION; ABSORPTION; FILMS AB Specular scattering of x rays by electrons in a material becomes large at grazing angles below the critical angle for external reflection. In contrast, we observe specular scattering by resonant nuclei to peak at the critical angle and decrease at smaller angles. This is the result of the influence of the electronic scattering on the nuclear response of the system and is explained using an optical model. A distorted-wave Born approximation shows the specular nuclear signal should be large at angles where the electronic reflectivity varies rapidly with angle. C1 KURCHATOV INST,RUSSIAN RES CTR,MOSCOW 123182,RUSSIA. UNIV CALIF SANTA CRUZ,DEPT PHYS,SANTA CRUZ,CA 95064. RP BARON, AQR (reprint author), STANFORD LINEAR ACCELERATOR CTR,STANFORD SYNCHROTRON RADIAT LAB,POB 4349,STANFORD,CA 94309, USA. NR 26 TC 35 Z9 36 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1994 VL 50 IS 14 BP 10354 EP 10357 DI 10.1103/PhysRevB.50.10354 PG 4 WC Physics, Condensed Matter SC Physics GA PL951 UT WOS:A1994PL95100081 ER PT J AU CHAN, LP LYNN, KG HARSHMAN, DR HADDON, RC AF CHAN, LP LYNN, KG HARSHMAN, DR HADDON, RC TI 2-DIMENSIONAL ANGULAR-CORRELATION-OF-ANNIHILATION-RADIATION STUDY OF KAPPA-(BEDT-TTF)2CU(NCS)2 SO PHYSICAL REVIEW B LA English DT Note ID ORGANIC SUPERCONDUCTOR; FERMI-SURFACE; POSITRON-ANNIHILATION; DEHAAS-VANALPHEN; (BEDT-TTF)2CU(NCS)2; YBA2CU3O7-X AB We report the two-dimensional angular-correlation-of-annihilation-radiation measurement of the e + e - (pair) momentum distribution in the organic superconductor kappa-(BEDT-TTF)2Cu(NCS)2. Our data, when compared with tight-binding (Huckel) electronic-band calculations, show features consistent with predicted Fermi surfaces. The structure around Z in our spectrum supports the results from earlier de Haas-van Alphen and Shubnikov-de Haas measurements. In addition, our data show features consistent with the predicted open Fermi surface that runs nearly parallel to YM. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. RP CHAN, LP (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Haddon, Robert/A-2528-2008 OI Haddon, Robert/0000-0002-7903-5139 NR 21 TC 7 Z9 7 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1994 VL 50 IS 14 BP 10393 EP 10396 DI 10.1103/PhysRevB.50.10393 PG 4 WC Physics, Condensed Matter SC Physics GA PL951 UT WOS:A1994PL95100091 ER PT J AU CUCOLO, AM DILEO, R ROMANO, P DABROWSKI, B HINKS, DG RADAELLI, PG AF CUCOLO, AM DILEO, R ROMANO, P DABROWSKI, B HINKS, DG RADAELLI, PG TI TUNNELING SPECTROSCOPY INTO YBA2CU4O8 - INTRALAYER AND INTERLAYER ANALYSIS SO PHYSICAL REVIEW B LA English DT Note ID OXYGEN-PRESSURE; SUPERCONDUCTORS; DENSITY; STATES AB We have measured the superconducting and normal tunneling characteristics of quality controlled planar junctions based on YBa2Cu4O8 (Y124) single crystals. Our data show that the in-plane properties are similar to the YBa2Cu3O7 (Y123) system. A higher value of the zero-bias conductance is measured in the Y124, indicating an increased number of normal electrons due to the presence of the double chain structure. Linearity of the background conductance is observed in both compounds. Less steep slopes are found in Y124 that might indicate a reduced interlayer coupling in this system. C1 NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP CUCOLO, AM (reprint author), SALERNO U,DIPARTIMENTO FIS,I-84081 BARONISSI,ITALY. RI Radaelli, Paolo/C-2952-2011 OI Radaelli, Paolo/0000-0002-6717-035X NR 21 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1994 VL 50 IS 14 BP 10397 EP 10400 DI 10.1103/PhysRevB.50.10397 PG 4 WC Physics, Condensed Matter SC Physics GA PL951 UT WOS:A1994PL95100092 ER PT J AU RANDERIA, M VARLAMOV, AA AF RANDERIA, M VARLAMOV, AA TI EFFECT OF SUPERCONDUCTING FLUCTUATIONS ON SPIN SUSCEPTIBILITY AND NMR RELAXATION RATE SO PHYSICAL REVIEW B LA English DT Note ID YBA2CU3O6+X; RESISTANCE; CU; TC AB We study the effect of superconducting fluctuations on the spin susceptibility chi(s) and NMR relaxation rate 1/T1 just above T(c) for arbitrary impurity concentrations. Fluctuations are found to reduce chi(s) below the Pauli susceptibility. 1/T1T is enhanced above the Korringa value for weak pair breaking, but suppressed when the pair breaking is large. RP RANDERIA, M (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 21 TC 31 Z9 31 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 OCT 1 PY 1994 VL 50 IS 14 BP 10401 EP 10404 DI 10.1103/PhysRevB.50.10401 PG 4 WC Physics, Condensed Matter SC Physics GA PL951 UT WOS:A1994PL95100093 ER PT J AU BATCHELDER, JC TIGHE, RJ MOLTZ, DM OGNIBENE, TJ ROWE, MW CERNY, J AF BATCHELDER, JC TIGHE, RJ MOLTZ, DM OGNIBENE, TJ ROWE, MW CERNY, J TI OBSERVATION OF BETA-DELAYED PROTON EMISSION FROM AL-24 SO PHYSICAL REVIEW C LA English DT Article ID DECAY AB Utilizing the Mg-24(p,n) reaction and a low-energy proton detector ball, beta-delayed proton emission from Al-24 has been observed in the form of a quasicontinuum of protons from approximately 300 to 1100 keV. By making a comparison with a previously known Al-24 beta-delayed alpha branching ratio, a branching ratio for beta-delayed proton emission of (1.2 +/- 0.3) x 10(-5) has been determined. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 17 TC 8 Z9 8 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD OCT PY 1994 VL 50 IS 4 BP 1807 EP 1812 DI 10.1103/PhysRevC.50.1807 PG 6 WC Physics, Nuclear SC Physics GA PM666 UT WOS:A1994PM66600009 ER PT J AU MUELLER, WF JENSEN, HJ REVIOL, W RIEDINGER, LL YU, CH ZHANG, JY NAZAREWICZ, W WYSS, R AF MUELLER, WF JENSEN, HJ REVIOL, W RIEDINGER, LL YU, CH ZHANG, JY NAZAREWICZ, W WYSS, R TI SIGNATURE SPLITTING IN NUCLEAR ROTATIONAL BANDS - NEUTRON I13/2 SYSTEMATICS SO PHYSICAL REVIEW C LA English DT Article ID HIGH-SPIN STATES; ODD-A NUCLEI; RARE-EARTH NUCLEI; CROSSING FREQUENCIES; SHAPE COEXISTENCE; INTRINSIC STATES; SPECTRA; REGION; VIBRATION; 150-A-190 AB Experimental values of signature splitting in nui13/2 rotational bands in odd-N even-Z nuclei in the Z = 62-78 region are collected and presented. A procedure is introduced to calculate signature splitting within the cranked deformed Woods-Saxon model. In the theoretical treatment, deformation parameters are obtained by minimizing the total Routhians of individual nui13/2 bands, and the procedure accounts for the possibility that the two signatures have different deformations and pairing gaps. Experimental signature splitting data for nui13/2 bands in Dy, Er, Yb, Hf, W, and Os nuclei are compared with calculated values. The sensitivity of calculated signature splitting to changes in deformation, pairing, and other model parameters is presented. C1 JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. MANNE SIEGBAHN INST,S-10405 STOCKHOLM,SWEDEN. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. UNIV COPENHAGEN,NIELS BOHR INST ASTRON PHYS & GEOPHYS,DK-2100 COPENHAGEN,DENMARK. UNIV ROCHESTER,NUCL STRUCT RES LAB,ROCHESTER,NY 14627. UNIV WARSAW,INST THEORET PHYS,PL-00681 WARSAW,POLAND. WARSAW INST TECHNOL,INST PHYS,WARSAW,POLAND. RP MUELLER, WF (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. NR 65 TC 24 Z9 26 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 OCT PY 1994 VL 50 IS 4 BP 1901 EP 1912 DI 10.1103/PhysRevC.50.1901 PG 12 WC Physics, Nuclear SC Physics GA PM666 UT WOS:A1994PM66600019 ER PT J AU VONACH, H PAVLIK, A CHADWICK, MB HAIGHT, RC NELSON, RO WENDER, SA YOUNG, PG AF VONACH, H PAVLIK, A CHADWICK, MB HAIGHT, RC NELSON, RO WENDER, SA YOUNG, PG TI PB-207, PB-208(N,XN-GAMMA) REACTIONS FOR NEUTRON ENERGIES FROM 3 TO 200 MEV SO PHYSICAL REVIEW C LA English DT Article ID NUCLEAR-REACTIONS; MODEL; SCATTERING AB High-resolution gamma-ray spectra from the interaction of neutrons in the energy range from 3 to 200 MeV with Pb-207, Pb-208 were measured with the white neutron source at the weapons neutron research (WNR) facility at Los Alamos National Laboratory. From these data, excitation functions for prominent gamma transitions in Pb-200,Pb-202,Pb-204, Pb-206, Pb-207,Pb-208 were derived from threshold to 200 MeV incident neutron energy. These gamma-production cross sections reflect the excitation cross sections for the respective residual nuclei. The results are compared with the predictions of nuclear reaction calculations based on the exciton model for precompound emission, the Hauser-Feshbach theory for compound nucleus decay, and coupled channels calculations to account for direct excitation of collective levels. Good agreement was obtained over the entire energy range covered in the experiment with reasonable model parameters. The results of this work clearly demonstrate that multiple preequilibrium emission has to be taken into account above about 40 MeV, and that the level density model of Ignatyuk, which accounts for the gradual disappearance of shell effects with increasing excitation energy, should be used instead of the Gilbert-Cameron and backshifted Fermi-gas models if excitation energies, should be used instead of the Gilbert-Cameron and backshifted Fermi-gas models if excitation energies exceed about 30 MeV. No indication for a reduction of the nuclear moment of inertia below the rigid body value was found. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP VONACH, H (reprint author), UNIV VIENNA,INST RADIUMFORSCH & KERNPHYS,A-1090 VIENNA,AUSTRIA. NR 29 TC 45 Z9 46 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 OCT PY 1994 VL 50 IS 4 BP 1952 EP 1963 DI 10.1103/PhysRevC.50.1952 PG 12 WC Physics, Nuclear SC Physics GA PM666 UT WOS:A1994PM66600026 ER PT J AU BRAVINA, L CSERNAI, LP LEVAI, P STROTTMAN, D AF BRAVINA, L CSERNAI, LP LEVAI, P STROTTMAN, D TI COLLECTIVE GLOBAL DYNAMICS IN AU+AU COLLISIONS AT THE BNL AGS SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION COLLISIONS; PHASE-TRANSITION AB Signatures of collective effects are studied in the quark gluon string model and in the fluid dynamical model for Au+Au collisions at 11.6A GeV/c. In the fluid dynamical model the dependence of observables on the quark-gluon plasma (QGP) formation in the equation of state is pointed out although the maximal total amount of pure QGP formed is only about 8 fm3 in these reactions. In contrast to the baryon rapidity distribution, the in-plane transverse flow and especially the squeeze-out effect are particularly sensitive to the EOS. In the QGSM the lifetime and extent of baryon density in strings are studied. The QGSM picture is very similar to the one obtained in the fluid dynamical model with a pure hadronic EOS. C1 KFKI RES INST PARTICLE & NUCL PHYS,H-1525 BUDAPEST,HUNGARY. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP BRAVINA, L (reprint author), UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. RI Levai, Peter/A-1544-2014 NR 13 TC 39 Z9 39 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 OCT PY 1994 VL 50 IS 4 BP 2161 EP 2166 DI 10.1103/PhysRevC.50.2161 PG 6 WC Physics, Nuclear SC Physics GA PM666 UT WOS:A1994PM66600048 ER PT J AU FREEMAN, SJ SMITH, AG WARBURTON, SJ BACK, BB BEARDEN, IG BLUMENTHAL, DJ CARPENTER, MP CROWELL, B DAVIDS, CN HENDERSON, D JANSSENS, RVF KHOO, TL LAURITSEN, T LISTER, CJ NISIUS, D PENTTILA, HT BECKER, JA CHOWDHURY, P MOORE, EF AF FREEMAN, SJ SMITH, AG WARBURTON, SJ BACK, BB BEARDEN, IG BLUMENTHAL, DJ CARPENTER, MP CROWELL, B DAVIDS, CN HENDERSON, D JANSSENS, RVF KHOO, TL LAURITSEN, T LISTER, CJ NISIUS, D PENTTILA, HT BECKER, JA CHOWDHURY, P MOORE, EF TI LOW-LYING STRUCTURE OF THE NEUTRON-DEFICIENT ISOTOPE RN-202 SO PHYSICAL REVIEW C LA English DT Note AB The low-lying level structure of the neutron-deficient isotope Rn-202 has been studied for the first time, using the Ta-181(Al-27,6n) and Pt-192(O-16,6n) reactions. Gamma-ray transitions between excited states in Rn-202 were identified by mass tagging using a recoil mass separator, the Argonne Fragment Mass Analyzer, and by observation of coincident x rays. Transitions in Rn-203 were also identified. The level scheme deduced from these data is consistent with the systematics of light radon isotopes below the N = 126 shell closure and with theoretical calculations indicating that the ground-state shape should not be strongly deformed at N = 116. C1 TRIANGLE UNIV NUCL LABS,DURHAM,NC 27708. UNIV MARYLAND,COLLEGE PK,MD 20742. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. N CAROLINA STATE UNIV,RALEIGH,NC 27695. UNIV JYVASKYLA,SF-40100 JYVASKYLA 10,FINLAND. WELLESLEY COLL,WELLESLEY,MA 02181. ARGONNE NATL LAB,ARGONNE,IL 60439. RP FREEMAN, SJ (reprint author), UNIV MANCHESTER,SCHUSTER LAB,MANCHESTER M13 9PL,LANCS,ENGLAND. RI Freeman, Sean/B-1280-2010; Penttila, Heikki/A-4420-2013; Bearden, Ian/M-4504-2014; Carpenter, Michael/E-4287-2015 OI Freeman, Sean/0000-0001-9773-4921; Bearden, Ian/0000-0003-2784-3094; Carpenter, Michael/0000-0002-3237-5734 NR 15 TC 12 Z9 12 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD OCT PY 1994 VL 50 IS 4 BP R1754 EP R1758 PG 5 WC Physics, Nuclear SC Physics GA PM666 UT WOS:A1994PM66600002 ER PT J AU ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BACCHETTA, N BADEN, AR BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CEN, Y CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONOT, D DICKSON, M DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JL LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUENKS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PIACENTINO, G PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPIES, A SPHICAS, P STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S AF ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BACCHETTA, N BADEN, AR BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CEN, Y CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONOT, D DICKSON, M DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JL LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUENKS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PIACENTINO, G PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPIES, A SPHICAS, P STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S TI MEASUREMENT OF THE B-MESON B-QUARK CROSS-SECTIONS AT ROOT-S=1.8 TEV USING THE EXCLUSIVE DECAY B(0)-]J/PSI-K-ASTERISK(892)0 SO PHYSICAL REVIEW D LA English DT Article ID = 1.8 TEV; HADRONIC COLLISIONS; E+E ANNIHILATION; QCD CORRECTIONS; COLLIDER; CDF AB This paper reports the measurement of the B meson and b quark cross sections through the decay chain B0 --> J/psi K* (892)0, J/psi --> mu+ mu-, K* (892)0 --> K+ pi-, using 4.3 pb-1 of data collected at the Collider Detector at Fermilab in pBARp collisions at square-root s = 1.8 TeV. We obtain sigma(B) = 1.5 +/- 0.7(stat)+/-0.6(syst) mub for B0 mesons with transverse momentum P(T) > 9.0 GeV/c and rapidity \y\ < 1.0. Using this results, we find sigma(b) = 3.7 +/- 1.6(stat)+/-1.5(syst) mub for b quarks with P(T) > 11.5 GeV/c and rapidity \y\ < 1.0. The b quark cross section is compared to next-to-leading order QCD calculations and previous measurements. C1 BRANDEIS UNIV,WALTHAM,MA 02254. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV CHICAGO,CHICAGO,IL 60637. DUKE UNIV,DURHAM,NC 27706. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,LAB NAZL FRASCATI,FRASCATI,ITALY. HARVARD UNIV,CAMBRIDGE,MA 02138. UNIV ILLINOIS,URBANA,IL 61801. MCGILL UNIV,INST PARTICLE PHYS,MONTREAL H3A 2T8,QUEBEC,CANADA. UNIV TORONTO,TORONTO M5S 1A7,ONTARIO,CANADA. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. UNIV MICHIGAN,ANN ARBOR,MI 48109. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. UNIV PADUA,INST NAZL FIS NUCL,SEZ PADOVA,I-35131 PADUA,ITALY. UNIV PENN,PHILADELPHIA,PA 19104. UNIV PITTSBURGH,PITTSBURGH,PA 15260. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14627. ROCKEFELLER UNIV,NEW YORK,NY 10021. RUTGERS STATE UNIV,PISCATAWAY,NJ 08854. TEXAS A&M UNIV,COLLEGE STN,TX 77843. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. TUFTS UNIV,MEDFORD,MA 02155. UNIV WISCONSIN,MADISON,WI 53706. RP ABE, F (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Kim, Soo-Bong/B-7061-2014 OI Chiarelli, Giorgio/0000-0001-9851-4816; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; NR 24 TC 33 Z9 33 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 OCT 1 PY 1994 VL 50 IS 7 BP 4252 EP 4257 DI 10.1103/PhysRevD.50.4252 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PJ439 UT WOS:A1994PJ43900004 ER PT J AU ANTONIAZZI, L ARENTON, M CAO, Z CHEN, T CONETTI, S CORTI, G COX, B DELCHAMPS, S FORTNEY, L GUFFEY, K HAIRE, M IOANNOU, P JENKINS, CM JUDD, DJ KOURKOUMELIS, C MANOUSAKISKATSIKAKIS, A KUZMINSKI, J LECOMPTE, T MARCHIONNI, A HE, M MAZUR, PO MURPHY, CT PRAMANTIOTIS, P RAMEIKA, R RESVANIS, LK ROSATI, M ROSEN, J SHEN, C SHEN, Q SIMARD, A SMITH, RP SPIEGEL, L STAIRS, DG TAN, Y TESAREK, RJ TURKINGTON, T TURNBULL, L TURKOT, F TZAMARIAS, S VOULGARIS, G WAGONER, DE WANG, C YANG, W YAO, N ZHANG, N ZHANG, X ZIOULAS, G ZOU, B AF ANTONIAZZI, L ARENTON, M CAO, Z CHEN, T CONETTI, S CORTI, G COX, B DELCHAMPS, S FORTNEY, L GUFFEY, K HAIRE, M IOANNOU, P JENKINS, CM JUDD, DJ KOURKOUMELIS, C MANOUSAKISKATSIKAKIS, A KUZMINSKI, J LECOMPTE, T MARCHIONNI, A HE, M MAZUR, PO MURPHY, CT PRAMANTIOTIS, P RAMEIKA, R RESVANIS, LK ROSATI, M ROSEN, J SHEN, C SHEN, Q SIMARD, A SMITH, RP SPIEGEL, L STAIRS, DG TAN, Y TESAREK, RJ TURKINGTON, T TURNBULL, L TURKOT, F TZAMARIAS, S VOULGARIS, G WAGONER, DE WANG, C YANG, W YAO, N ZHANG, N ZHANG, X ZIOULAS, G ZOU, B TI SEARCH FOR HIDDEN CHARM STATES DECAYING INTO J-PSI OR PSI' PLUS PIONS SO PHYSICAL REVIEW D LA English DT Article ID GEV POSITRONS; SCINTILLATION; MESONS; ARRAY AB A search has been made in 300 GeV/c pi+/-- and proton-Li interactions for production of states that decay into J/psi or psi' plus one or two pions. A 2.5sigma enhancement in the J/psi pi0 spectrum, possibly the recently reported 1P1 state of charmonium, is observed at a mass of 3.527 GeV/c2. In the J/psi plus two pion mass spectrum, we report, together with the expected psi' --> J/psi pi+pi-, the tentative observation of a structure at a mass of 3.836 GeV/c2. No enhancements are seen in the J/psi pi+/-pi+/-, J/psi pi+/-pi0, J/psi pi+/-, or psi' pi+/- mass spectra. C1 DUKE UNIV,DURHAM,NC 27706. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. MCGILL UNIV,MONTREAL H3A 2T8,QUEBEC,CANADA. NANJING UNIV,NANJING,PEOPLES R CHINA. PRAIRIE VIEW A&M UNIV,PRAIRIE VIEW,TX 77445. NORTHWESTERN UNIV,EVANSTON,IL 60208. SHANDONG UNIV,JINAN,PEOPLES R CHINA. UNIV VIRGINIA,CHARLOTTESVILLE,VA 22901. RP ANTONIAZZI, L (reprint author), UNIV ATHENS,ATHENS,GREECE. NR 16 TC 37 Z9 38 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 OCT 1 PY 1994 VL 50 IS 7 BP 4258 EP 4264 DI 10.1103/PhysRevD.50.4258 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PJ439 UT WOS:A1994PJ43900005 ER PT J AU LEVIN, E WUSTHOFF, M AF LEVIN, E WUSTHOFF, M TI PHOTON DIFFRACTIVE DISSOCIATION IN DEEP-INELASTIC SCATTERING SO PHYSICAL REVIEW D LA English DT Article ID POMERON STRUCTURE-FUNCTION; PERTURBATION-THEORY; ELASTIC-SCATTERING; JET STRUCTURE; QCD; FACTORIZATION; REGION; MODEL AB This paper is mainly devoted to the presentation and discussion of formulas for the cross section of photon diffractive dissociation. The calculations which we present in a very detailed way are based on perturbative QCD. We improve formulas which describe this process in the triple Regge limit where the square of the missing mass M(X) (the invariant mass of the bunch of secondary hadrons) is much larger than \Q2\ and extend the range of validity to the region where M(X)2 is of the same order as \Q2\. We introduce a diffractive dissociation structure function and show that it obeys the Gribov-Lipatov-Altarelli-Parisi evolution equation, but, with an additional inhomogeneous term. The relation to the Pomeron structure function is discussed. C1 UNIV HAMBURG,INST THEORET PHYS 2,W-2000 HAMBURG 13,GERMANY. RP LEVIN, E (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 29 TC 55 Z9 55 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 OCT 1 PY 1994 VL 50 IS 7 BP 4306 EP 4327 DI 10.1103/PhysRevD.50.4306 PG 22 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PJ439 UT WOS:A1994PJ43900011 ER PT J AU HYER, T AF HYER, T TI SEMIEXCLUSIVE PRODUCTION IN ELECTRON-POSITRON ANNIHILATION SO PHYSICAL REVIEW D LA English DT Article ID PERTURBATIVE QUANTUM CHROMODYNAMICS; EXCLUSIVE PROCESSES; WAVE-FUNCTIONS; CROSS-SECTION; INELASTIC-SCATTERING; ELASTIC-SCATTERING; QCD; BEHAVIOR; COLLISIONS; WAVEFUNCTION AB We present a thorough analysis of the direct semiexclusive production in quantum chromodynamics (QCD) of single, highly isolated mesons from electron-position or two-photon initial states. Corrections of higher order and of subleading twist are considered, and potential divergences in the naive calculation are contained. Monte Carlo methods are used to relate the QCD calculations to experimentally measurable quantities. We find that the study of semiexclusive production is the most sensitive experimental probe of the structure of mesons in the valence (qqBAR) state of energies square-root greater-than-or-simiilar-to 10 GeV. RP HYER, T (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 51 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 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD OCT 1 PY 1994 VL 50 IS 7 BP 4382 EP 4411 DI 10.1103/PhysRevD.50.4382 PG 30 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PJ439 UT WOS:A1994PJ43900016 ER PT J AU RIZZO, TG AF RIZZO, TG TI PROBING ANOMALOUS CHROMOMAGNETIC TOP-QUARK COUPLINGS AT THE NEXT LINEAR COLLIDER SO PHYSICAL REVIEW D LA English DT Article ID E+E ANNIHILATION; POLARIZATION AB The Next Linear Collider (NLC) will provide an excellent tool for probing the detailed nature of the top quark. By extending the recent analysis of Dokshitzer, Khoze, and Stirling, we perform a preliminary examination of the influence of an anomalous chromomagnetic moment for the top, kappa, on the spectrum of gluon radiation associated with ttBAR production. In particular, we analyze the sensitivity of future data to nonzero values of kappa and estimate the limits that can be placed on this parameter at the NLC with center of mass energies square-roots = 500 and 1000 GeV. RP RIZZO, TG (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 32 TC 31 Z9 31 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 OCT 1 PY 1994 VL 50 IS 7 BP 4478 EP 4484 DI 10.1103/PhysRevD.50.4478 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PJ439 UT WOS:A1994PJ43900024 ER PT J AU STANGE, A MARCIANO, W WILLENBROCK, S AF STANGE, A MARCIANO, W WILLENBROCK, S TI ASSOCIATED PRODUCTION OF HIGGS AND WEAK BOSONS, WITH H-]B(B)OVER-BAR AT HADRON COLLIDERS SO PHYSICAL REVIEW D LA English DT Article ID GRAND UNIFIED THEORIES; W-GLUON FUSION; TOP-QUARK; FERMILAB TEVATRON; PROTON COLLIDERS; QCD CORRECTIONS; SUPERCOLLIDERS; SUPERSYMMETRY; PARTICLES; DECAYS AB We consider the search for the Higgs boson at a high-luminosity Fermilab Tevatron (square-root s = 2 TeV), an upgraded Tevatron of energy square-root s = 3.5 TeV, and the CERN Large Hadron Collider (LHC, square-root s = 14 TeV), via WH/ZH production followed by H --> bbBAR and leptonic decay of the weak vector bosons. We show that each of these colliders can potentially observe the standard Higgs boson in the intermediate-mass range 80 GeV < m(H) < 120 GeV. This mode complements the search for and the study of the intermediate-mass Higgs boson via H --> gammagamma at the LHC. In addition, it can potentially be used to observe the lightest Higgs scalar of the minimal supersymmetric model, h, in a region of parameter space not accessible to CERN LEP II or the LHC (using h --> gammagamma, ZZ*). C1 UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. RP STANGE, A (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 40 TC 89 Z9 89 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 OCT 1 PY 1994 VL 50 IS 7 BP 4491 EP 4498 DI 10.1103/PhysRevD.50.4491 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PJ439 UT WOS:A1994PJ43900026 ER PT J AU BAER, H CHEN, CH PAIGE, F TATA, X AF BAER, H CHEN, CH PAIGE, F TATA, X TI TRILEPTONS FROM CHARGINO-NEUTRALINO PRODUCTION AT THE CERN LARGE HADRON COLLIDER SO PHYSICAL REVIEW D LA English DT Article ID FERMILAB TEVATRON COLLIDER; Z0 DECAYS; SUPERSYMMETRIC PARTICLES; MULTILEPTON SIGNALS; PBARP COLLIDERS; SEARCH; SUPERGRAVITY; GAUGINOS; LEP; UNIFICATION AB We study direct production of charginos and neutralinos at the CERN Large Hadron Collider. We simulate all channels of chargino and neutralino production using ISAJET 7.07. The best mode for observing such processes appears to be pp --> W1Z2 --> 3l + is-not-an-element-of(T). We evaluate signal expectations and background levels, and suggest cuts to optimize the signal. The trilepton mode should be viable provided m(g) less-than-or-similar-to 50 - 600 GeV; above this mass, the decay modes Z2 --> Z1Z and Z2 --> H(l)Z1 become dominant, spoiling the signal. In this first case, the leptonic branching fraction for Z decay is small and additional background from WZ is present, while in the second case, the trilepton signal is essentially absent. For smaller values of m(g), the trilepton signal should be visible above background, especially if \mu\ congruent-to m(g) and m(l) much less than m(q), in which case the leptonic decays of Z2 are enhanced. Distributions in dilepton mass m(llBAR) can yield direct information on neutralino masses due to the distribution cutoff at m(Z2) - m(Z1). Other distributions that may lead to an additional constraint amongst the chargino and neutralino masses are also examined. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV HAWAII,DEPT PHYS & ASTRON,HONOLULU,HI 96822. RP BAER, H (reprint author), FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306, USA. NR 42 TC 107 Z9 107 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 OCT 1 PY 1994 VL 50 IS 7 BP 4508 EP 4516 DI 10.1103/PhysRevD.50.4508 PG 9 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PJ439 UT WOS:A1994PJ43900028 ER PT J AU SUZUKI, M AF SUZUKI, M TI CAN THE S-QUARK BE TREATED AS HEAVY IN SPECTROSCOPY SO PHYSICAL REVIEW D LA English DT Note ID MESONS AB In the heavy quark limit, the two mass eigenstates of the heavy-flavored mesons with J(P) = 1+ are labeled with the total angular momentum of the light system j = 1/2 and 3/2. If the s quark were treated as heavy, both the d-to-s-wave ratio of the decay K1 --> K*pi and a recent analysis of the tau-decay mode tau --> nu(tau)K1 would suggest that the lighter meson K1(1270) should be assigned to the j = 3/2 state, while the heavier K1(1400) be the j = 1/2 state. This level pattern would require the spin-orbit coupling for the strange mesons to be opposite in sign to that for the nonstrange mesons and for the charmonia. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP SUZUKI, M (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 6 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 OCT 1 PY 1994 VL 50 IS 7 BP 4708 EP 4710 DI 10.1103/PhysRevD.50.4708 PG 3 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PJ439 UT WOS:A1994PJ43900051 ER PT J AU BLUMENFELD, R AF BLUMENFELD, R TI FORMULATING A FIRST-PRINCIPLES STATISTICAL-THEORY OF GROWING SURFACES IN 2-DIMENSIONAL LAPLACIAN FIELDS SO PHYSICAL REVIEW E LA English DT Article ID DIFFUSION-LIMITED AGGREGATION; RENORMALIZATION-GROUP APPROACH; GROWTH PROBABILITY-DISTRIBUTION; HELE SHAW CELL; INTERFACE DYNAMICS; SCALING STRUCTURE; SINGULARITIES; MOTION; FLOWS AB A statistical theory of two-dimensional Laplacian growths is formulated from first principles. First, the area enclosed by the growing surface is mapped conformally to the interior of the unit circle, generating a set of dynamically evolving quasiparticles. Then it is shown that the evolution of a surface-tension-free growing surface is Hamiltonian. The Hamiltonian formulation allows a natural extension of the formalism to growths with either isotropic or anisotropic surface tension. It is shown that the curvature term can be included as a surface energy in the Hamiltonian that gives rise to repulsion between the quasiparticles and the surface. This repulsion prevents cusp singularities from forming along the surface at any finite time, and regularizes the growth. An explicit example is computed to demonstrate the regularizing effect. Noise is then introduced as in traditional statistical mechanical formalism, and a measure is defined that allows analysis of the spatial distribution of the quasiparticles. Finally, a relation is derived between this distribution and the growth probability along the growing surface. Since the spatial distribution of quasiparticles flows to a stable limiting form, this immediately translates into a predictability of the asymptotic morphology of the surface. An exactly solvable class of arbitrary initial conditions is analyzed explicitly. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP BLUMENFELD, R (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,MAIL STOP B258,LOS ALAMOS,NM 87545, USA. NR 45 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 1063-651X J9 PHYS REV E JI Phys. Rev. E PD OCT PY 1994 VL 50 IS 4 BP 2952 EP 2962 DI 10.1103/PhysRevE.50.2952 PG 11 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA PP118 UT WOS:A1994PP11800074 ER PT J AU ZOLOTOREV, MS ZHOLENTS, AA AF ZOLOTOREV, MS ZHOLENTS, AA TI TRANSIT-TIME METHOD OF OPTICAL STOCHASTIC COOLING SO PHYSICAL REVIEW E LA English DT Article AB A transit-time method for stochastic cooling is extended and developed for optical stochastic cooling. Limitations on the damping times are analyzed. Illustrative applications of the method to the cooling of electrons, protons, and heavy ions are considered. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV ACCELERATOR & FUS RES, CTR BEAM PHYS, BERKELEY, CA 94720 USA. RP STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. NR 7 TC 31 Z9 31 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0045 EI 2470-0053 J9 PHYS REV E JI Phys. Rev. E PD OCT PY 1994 VL 50 IS 4 BP 3087 EP 3091 DI 10.1103/PhysRevE.50.3087 PG 5 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA PP118 UT WOS:A1994PP11800090 ER PT J AU MARTIN, JE ODINEK, J HALSEY, TC AF MARTIN, JE ODINEK, J HALSEY, TC TI STRUCTURE OF AN ELECTRORHEOLOGICAL FLUID IN STEADY SHEAR SO PHYSICAL REVIEW E LA English DT Note ID SUSPENSIONS; RHEOLOGY AB We report a real-time, two-dimensional light scattering study of the structure of an electrorheological fluid under steady shear. When an electric field is applied to the quiescent fluid, particles chain along the electric field lines and cause strong light scattering lobes to appear at a finite scattering wave vector q orthogonal to the field lines. We find that when the sample is subjected to steady shear a steady state scattering pattern emerges with lobes that are rotated in the direction of fluid vorticity. The angle of rotation is found to increase as the cube root of the shear rate, in agreement with a theoretical prediction of the steady state structure of fragmenting particle droplets. C1 UNIV CHICAGO,JAMES FRANCK INST,CHICAGO,IL 60637. UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637. RP MARTIN, JE (reprint author), SANDIA NATL LABS,DIV ADV MAT PHYS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 12 TC 11 Z9 11 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD OCT PY 1994 VL 50 IS 4 BP 3263 EP 3266 DI 10.1103/PhysRevE.50.3263 PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA PP118 UT WOS:A1994PP11800113 ER PT J AU SANCHEZ, A BERNAL, MJ RIVEIRO, JM AF SANCHEZ, A BERNAL, MJ RIVEIRO, JM TI MULTIPARTICLE AGGREGATION MODEL FOR DENDRITIC GROWTH APPLIED TO EXPERIMENTS ON AMORPHOUS CO-P ALLOYS SO PHYSICAL REVIEW E LA English DT Note ID DIFFUSION-LIMITED AGGREGATION; FRACTAL AGGREGATION AB We introduce a multiparticle biased diffusion limited aggregation model for dendritic growth. Its most relevant feature is that it includes the overall effect of strong applied electric fields and therefore applies to nonequilibrium situations. We compare simulations of a two species version of our model to actual experiments on preparation of amorphous Co-P alloys with very good agreement: The model accurately reproduces the dependence of composition, morphology, and growth time of the alloy on the current. We conclude with a discussion of specific predictions and possible generalizations of the model. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV CASTILLA LA MANCHA,FAC CIENCIAS QUIM,DEPT FIS APLICADA,E-13004 CIUDAD REAL,SPAIN. RP SANCHEZ, A (reprint author), UNIV CARLOS III,ESCUELA POLITECN SUPER,C BUTARQUE 15,E-28911 MADRID,SPAIN. RI Sanchez, Angel/A-9229-2008 OI Sanchez, Angel/0000-0003-1874-2881 NR 19 TC 12 Z9 12 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD OCT PY 1994 VL 50 IS 4 BP R2427 EP R2430 PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA PP118 UT WOS:A1994PP11800010 ER PT J AU EISENSTEIN, RA AF EISENSTEIN, RA TI FLAVOR PRODUCTION IN (P)OVER-BAR-P REACTIONS AT LOW ENERGIES SO PHYSICS OF ATOMIC NUCLEI LA English DT Article; Proceedings Paper CT 2nd Biennial International Workshop on Nucleon-Antinucleon Physics (NAN 93) CY SEP 13-18, 1993 CL INST THEORET & EXPTL PHYS, MOSCOW, RUSSIA SP INST THEORET & EXPTL PHYS, LAB NAZL FRASCATI HO INST THEORET & EXPTL PHYS ID ONE-GLUON-EXCHANGE; PBARP->LAMBDA-BAR-LAMBDA REACTION; MESON-EXCHANGE; EXCLUSIVE PRODUCTION; ANTIPROTON PHYSICS; LAMBDA-PRODUCTION; 1.695 GEV/C; QUARK-MODEL; THRESHOLD; ANNIHILATION C1 CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. CERN,CH-1211 GENEVA,SWITZERLAND. UNIV ERLANGEN NURNBERG,W-8520 ERLANGEN,GERMANY. UNIV FREIBURG,FREIBURG,GERMANY. KFA JULICH,INST KERNPHYS,JULICH,GERMANY. LOS ALAMOS NATL LAB,LOS ALAMOS,NM. UPPSALA UNIV,UPPSALA,SWEDEN. RP EISENSTEIN, RA (reprint author), UNIV ILLINOIS,CHICAGO,IL 60680, USA. NR 73 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1063-7788 J9 PHYS ATOM NUCL+ JI Phys. Atom. Nuclei PD OCT PY 1994 VL 57 IS 10 BP 1680 EP 1692 PG 13 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA PQ853 UT WOS:A1994PQ85300003 ER PT J AU AMSLER, C ARMSTRONG, DS AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BLUM, P BOSSINGHAM, R BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T COOPER, A CROWE, KM DEGENER, T DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDERMANN, J MATTHAY, H MERKEL, M MERLO, JP MEYER, CA MONTANET, L NOBLE, A OULDSAADA, F PETERS, K PINDER, C PINTER, G RAVNDAL, S SALK, J SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOU, B ZOLL, J ZUPANCIC, C AF AMSLER, C ARMSTRONG, DS AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BLUM, P BOSSINGHAM, R BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T COOPER, A CROWE, KM DEGENER, T DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDERMANN, J MATTHAY, H MERKEL, M MERLO, JP MEYER, CA MONTANET, L NOBLE, A OULDSAADA, F PETERS, K PINDER, C PINTER, G RAVNDAL, S SALK, J SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOU, B ZOLL, J ZUPANCIC, C TI ETA-DECAY BRANCHING RATIOS SO PHYSICS OF ATOMIC NUCLEI LA English DT Article; Proceedings Paper CT 2nd Biennial International Workshop on Nucleon-Antinucleon Physics (NAN 93) CY SEP 13-18, 1993 CL INST THEORET & EXPTL PHYS, MOSCOW, RUSSIA SP INST THEORET & EXPTL PHYS, LAB NAZL FRASCATI HO INST THEORET & EXPTL PHYS C1 RUHR UNIV BOCHUM,W-4630 BOCHUM,GERMANY. HUNGARIAN ACAD SCI,BUDAPEST,HUNGARY. RUTHERFORD APPLETON LAB,CHILTON,ENGLAND. CERN,CH-1211 GENEVA,SWITZERLAND. UNIV HAMBURG,HAMBURG,GERMANY. UNIV KARLSRUHE,KARLSRUHE,GERMANY. UNIV LONDON QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND. UNIV CALIF LOS ANGELES,LOS ANGELES,CA. UNIV MAINZ,W-6500 MAINZ,GERMANY. UNIV MUNICH,MUNICH,GERMANY. CTR RECH NUCL,STRASBOURG,FRANCE. UNIV ZURICH,ZURICH,SWITZERLAND. RP AMSLER, C (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 19 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 1063-7788 J9 PHYS ATOM NUCL+ JI Phys. Atom. Nuclei PD OCT PY 1994 VL 57 IS 10 BP 1711 EP 1715 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA PQ853 UT WOS:A1994PQ85300006 ER PT J AU HOLZSCHEITER, MH DYER, PL HOIBRATEN, S KING, NSP LEWIS, RA LIZON, DC MORGAN, GL ROCHET, J SCHAUER, MM SCHECKER, JA OTTO, T AF HOLZSCHEITER, MH DYER, PL HOIBRATEN, S KING, NSP LEWIS, RA LIZON, DC MORGAN, GL ROCHET, J SCHAUER, MM SCHECKER, JA OTTO, T TI THE PS200 CATCHING TRAP - A NEW TOOL FOR ULTRALOW-ENERGY ANTIPROTON PHYSICS SO PHYSICS OF ATOMIC NUCLEI LA English DT Article; Proceedings Paper CT 2nd Biennial International Workshop on Nucleon-Antinucleon Physics (NAN 93) CY SEP 13-18, 1993 CL INST THEORET & EXPTL PHYS, MOSCOW, RUSSIA SP INST THEORET & EXPTL PHYS, LAB NAZL FRASCATI HO INST THEORET & EXPTL PHYS C1 UNIV COLORADO,BOULDER,CO 80309. PENN STATE UNIV,OSMOND LAB,UNIVERSITY PK,PA 16802. CERN,DIV PPE,CH-1211 GENEVA,SWITZERLAND. RP HOLZSCHEITER, MH (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 14 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1063-7788 J9 PHYS ATOM NUCL+ JI Phys. Atom. Nuclei PD OCT PY 1994 VL 57 IS 10 BP 1799 EP 1809 PG 11 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA PQ853 UT WOS:A1994PQ85300017 ER PT J AU YAMADA, M LEVINTON, FM POMPHREY, N BUDHY, R MANICKAM, J NAGAYAMA, Y AF YAMADA, M LEVINTON, FM POMPHREY, N BUDHY, R MANICKAM, J NAGAYAMA, Y TI INVESTIGATION OF MAGNETIC RECONNECTION DURING A SAWTOOTH CRASH IN A HIGH-TEMPERATURE TOKAMAK PLASMA SO PHYSICS OF PLASMAS LA English DT Article ID SAFETY-FACTOR; TFTR; OSCILLATIONS; DISCHARGES; PROFILE AB In this paper a laboratory investigation is made on magnetic reconnection in high-temperature Tokamak Fusion Test Reactor (TFTR) plasmas [Plasma Physics and Controlled Nuclear Fusion Research 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. 1, p. 51]. The motional Stark effect (MSE) diagnostic is employed to measure the pitch angle profile of magnetic field lines, and hence the q profile. An analytical expression that relates pitch angle to q profile is presented for a toroidal plasma with circular cross section. During the crash phase of sawtooth oscillations in plasma discharges, the ECE (electron cyclotron emission) diagnostic measures a fast flattening of the two-dimensional (2-D) electron temperature profile in a poloidal plane, an observation consistent with the Kadomtsev reconnection theory. On the other hand, the MSE measurements indicate that central q values do not relax to unity after the crash, but increase only by 5%-15%, typically from 0.7 to 0.8. The latter result is in contradiction with the 2-D models of Kadomtsev and/or Wesson. In the present study this puzzle is addressed by a simultaneous analysis of electron temperature and q profile evolutions. Based on a heuristic model for magnetic reconnection during the sawtooth crash, the small change of q, i.e., partial reconnection, is attributed to the precipitous drop of pressure gradients that drive the instability and the reconnection process, as well as flux conserving plasma dynamics. C1 FUS PHYS & TECHNOL,TORRANCE,CA 90503. UNIV TSUKUBA,TSUKUBA,IBARAKI 30031,JAPAN. RP YAMADA, M (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. RI pomphrey, neil/G-4405-2010; Yamada, Masaaki/D-7824-2015 OI Yamada, Masaaki/0000-0003-4996-1649 NR 30 TC 85 Z9 88 U1 1 U2 14 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD OCT PY 1994 VL 1 IS 10 BP 3269 EP 3276 DI 10.1063/1.870479 PG 8 WC Physics, Fluids & Plasmas SC Physics GA PL630 UT WOS:A1994PL63000015 ER PT J AU TYNAN, GR SCHMIDTZ, L BLUSH, L BOEDO, JA CONN, RW DOERNER, R LEHMER, R MOYER, R KUGEL, H BELL, R KAYE, S OKABAYASHI, M SESNIC, S SUN, Y AF TYNAN, GR SCHMIDTZ, L BLUSH, L BOEDO, JA CONN, RW DOERNER, R LEHMER, R MOYER, R KUGEL, H BELL, R KAYE, S OKABAYASHI, M SESNIC, S SUN, Y TI TURBULENT EDGE TRANSPORT IN THE PRINCETON BETA-EXPERIMENT-MODIFIED HIGH CONFINEMENT MODE SO PHYSICS OF PLASMAS LA English DT Article ID H-MODE; POLOIDAL ROTATION; TEMPERATURE-FLUCTUATIONS; ELECTRIC-FIELD; TOKAMAK; PLASMA; INSTABILITY; DISCHARGES; TRANSITION; FLOW AB The first probe measurements of edge turbulence and transport in a neutral beam induced high confinement mode (H-mode) are reported. A strong negative radial electric field is directly observed in H-mode. A transient suppression of normalized ion saturation and floating potential fluctuation levels occurs at the low confinement mode to high confinement mode (L-H) transition, followed by a recovery to near low mode (L-mode) levels. The average poloidal wave number and the poloidal wave-number spectral width are decreased, and the correlation between fluctuating density and potential is reduced. A large-amplitude coherent oscillation, localized to the strong radial electric field region, is observed in H-mode but does not cause transport. In H-mode the effective turbulent diffusion coefficient is reduced by an order of magnitude inside the last closed flux surface and in the scrape-off layer. The results are compared with a heuristic model of turbulence suppression by velocity-shear stabilization. C1 PRINCETON UNIV, PRINCETON PLASMA PHYS LAB, PRINCETON, NJ 08544 USA. RP UNIV CALIF LOS ANGELES, INST PLASMA & FUS RES, LOS ANGELES, CA 90024 USA. NR 27 TC 70 Z9 70 U1 2 U2 3 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 1070-664X EI 1089-7674 J9 PHYS PLASMAS JI Phys. Plasmas PD OCT PY 1994 VL 1 IS 10 BP 3301 EP 3307 DI 10.1063/1.870916 PG 7 WC Physics, Fluids & Plasmas SC Physics GA PL630 UT WOS:A1994PL63000018 ER PT J AU SHAING, KC HSU, CT HAZELTINE, RD AF SHAING, KC HSU, CT HAZELTINE, RD TI EFFECT OF ORBIT SQUEEZING ON POLOIDAL MASS-FLOW AND BOOTSTRAP CURRENT IN TOKAMAK PLASMAS SO PHYSICS OF PLASMAS LA English DT Article ID DRIFT-KINETIC-EQUATION; L-H TRANSITION; TRANSPORT; MODE; ROTATION; FIELD AB It is shown, by solving the drift kinetic equation, that the asymptotic values of the poloidal mass flow and the bootstrap current in the banana regime of large-aspect-ratio tokamak plasmas are not affected by orbit squeezing. However, because the definition of ion collisionality upsilon(*i) is reduced by a factor S-3/2, with S = 1 - (rho(pi)d In E(r)/dr) (cE(r)/B(p)nu(ti)), the values of both the poloidal mass flow and the bootstrap current at the banana-plateau transition are different from those of the conventional neoclassical theory. Here, rho(pi) is the ion poloidal gyroradius, E(r) is the radial electric field, c is the speed of light, B(p) is the poloidal magnetic strength, nu(ti) is the ion thermal speed, and r is the local radius. Tle implications for the experimental observations of poloidal rotation speeds in high mode (H mode) are discussed. C1 MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139. UNIV TEXAS,INST FUS STUDIES,AUSTIN,TX 78712. RP SHAING, KC (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 25 TC 26 Z9 26 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD OCT PY 1994 VL 1 IS 10 BP 3365 EP 3368 DI 10.1063/1.870484 PG 4 WC Physics, Fluids & Plasmas SC Physics GA PL630 UT WOS:A1994PL63000022 ER PT J AU WU, YL CHENG, CZ WHITE, RB AF WU, YL CHENG, CZ WHITE, RB TI ALPHA-PARTICLE EFFECTS ON THE INTERNAL KINK AND FISHBONE MODES SO PHYSICS OF PLASMAS LA English DT Article ID ENERGETIC TRAPPED-PARTICLES; TEMPERATURE-GRADIENT MODES; TOROIDAL PLASMAS; IONS; STABILIZATION AB The effects of alpha particles on the internal kink and fishbone modes are studied analytically. The nonadiabatic contribution from untrapped alpha particles is negligible. Finite inverse aspect ratio, plasma beta, and plasma shaping effects can significantly enhance the trapped particle drift reversal domain in the pitch angle space and reduce the bounce-averaged magnetic drift frequency. The decrease of the drift magnitude and drift reversal effects on the ideal kink mode is small, but the beta(alpha) threshold for the fishbone mode can be much lower than previously predicted [B. Coppi, S. Migliuolo, F. Pegoraro, and F. Porcelli, Phys. Fluids B 2, 927 (1990)]. Moreover, the fishbone mode could be excited by alpha particles, even when the plasma is stable in the ideal magnetohydrodynamic (MHD) limit. In addition, the ion diamagnetic drift frequency (finite ion Larmor radius effect) has a strong destabilizing effect on the fishbone mode when it is comparable with the trapped alpha-averaged precessional drift frequency, even though it stabilizes the plasma in the ideal MHD limit. RP WU, YL (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. RI White, Roscoe/D-1773-2013; Cheng, Chio/K-1005-2014 OI White, Roscoe/0000-0002-4239-2685; NR 18 TC 20 Z9 20 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD OCT PY 1994 VL 1 IS 10 BP 3369 EP 3377 DI 10.1063/1.870485 PG 9 WC Physics, Fluids & Plasmas SC Physics GA PL630 UT WOS:A1994PL63000023 ER PT J AU SOBEHART, JR AF SOBEHART, JR TI LOW-NOISE ASYMPTOTIC APPROACH TO THE LASER COOLING OF TRAPPED IONS SO PHYSICS OF PLASMAS LA English DT Article ID COOLED IONS; PAUL TRAP; MOTION; CHAOS; PARTICLES; PLASMAS; LIMIT; ORDER; PHASE AB The probability distributions of dilute ion systems and two-ion systems trapped in time-dependent potential wells and driven by a radiation field are studied. Ions are excited by electromagnetic radiation and relax back due to either spontaneous or stimulated emissions. The photon statistics are considered Poissonian and the momentum transfer between the electromagnetic field, and the ions are assumed discrete. In the present classical treatment, the photon-ion interaction is simulated, with an effective noise acting on the ions, which produces a stochastic transfer of momentum. The present results are closely related to the quantum treatment in the heavy particle limit as well as to those derived from previous semiclassical models. RP SOBEHART, JR (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,MS B-258,LOS ALAMOS,NM 87545, USA. NR 36 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 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD OCT PY 1994 VL 1 IS 10 BP 3490 EP 3501 PG 12 WC Physics, Fluids & Plasmas SC Physics GA PL630 UT WOS:A1994PL63000035 ER PT J AU BUSSOD, GY PAULSSEN, H AF BUSSOD, GY PAULSSEN, H TI THE MANTLE TRANSITION ZONE - COMPOSITION, DISCONTINUITIES, DYNAMICS - INTRODUCTION SO PHYSICS OF THE EARTH AND PLANETARY INTERIORS LA English DT Editorial Material C1 UNIV UTRECHT,DEPT THEORET GEOPHYS,3508 TA UTRECHT,NETHERLANDS. RP BUSSOD, GY (reprint author), LOS ALAMOS NATL LAB,EES-4,MSD-443,LOS ALAMOS,NM 87545, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0031-9201 J9 PHYS EARTH PLANET IN JI Phys. Earth Planet. Inter. PD OCT PY 1994 VL 86 IS 1-3 BP 1 EP 3 DI 10.1016/0031-9201(94)05071-6 PG 3 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA PQ827 UT WOS:A1994PQ82700001 ER PT J AU SHARP, TG BUSSOD, GYA KATSURA, T AF SHARP, TG BUSSOD, GYA KATSURA, T TI MICROSTRUCTURES IN BETA-MG1.8FE0.2SIO4 EXPERIMENTALLY DEFORMED AT TRANSITION-ZONE CONDITIONS SO PHYSICS OF THE EARTH AND PLANETARY INTERIORS LA English DT Article ID OLIVINE SPINEL TRANSFORMATION; BETA-PHASE TRANSFORMATION; CRYSTAL ELASTIC PROPERTIES; DEEP-FOCUS EARTHQUAKES; STACKING-FAULTS; HIGH-PRESSURE; MECHANISM; MG2SIO4; MG2GEO4; (MG,FE)2SIO4 AB The microstructures that develop in experimentally deformed beta-Mg1.8Fe0.2SiO4 have been investigated by petrographic and transmission electron microscopy to determine the deformation mechanisms that are active under transition-zone conditions. Advances in the application of the multi-anvil apparatus to deformation studies allowed us to deform beta-Mg1.8Fe0.2SiO4 at pressures of 14 GPa and greater and 1450 degrees C. San Carlos olivine was transformed to beta-phase and allowed to relax at an average strain rate of 1 x 10(-5) for 3 h and subsequently deformed at a constant strain rate of 1 x 10(-4). The olivine to beta-phase transformation and deformation result in a bimodal grain size with the large grains having a preferred orientation. Deformation by dislocation creep and subgrain formation causes grain size reduction and nearly identical microstructures in the relaxed and high strain-rate samples. The dominant slip systems involved in the deformation of polycrystalline beta-phase appear to be (010)[100] and (010)[001]. Slip in the [001] direction occurs by the glide of disassociated dislocations and produces Shockley-type stacking faults. The anisotropy that develops from the olivine to beta-phase transformation under stress and subsequent dislocation creep may have profound effects on dynamic processes in the transition zone. C1 LOS ALAMOS NATL LAB,DIV EARTH & ENVIRONM SCI,LOS ALAMOS,NM 87545. OKAYAMA UNIV,INST STUDY EARTHS INTERIOR,TOTTORI 68201,JAPAN. RP SHARP, TG (reprint author), UNIV BAYREUTH,BAYER GEOINST,POSTFACH 101251,D-95440 BAYREUTH,GERMANY. OI Katsura, Tomoo/0000-0001-7857-5101 NR 22 TC 40 Z9 40 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0031-9201 J9 PHYS EARTH PLANET IN JI Phys. Earth Planet. Inter. PD OCT PY 1994 VL 86 IS 1-3 BP 69 EP 83 DI 10.1016/0031-9201(94)05062-7 PG 15 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA PQ827 UT WOS:A1994PQ82700006 ER PT J AU BERNARD, V KAISER, N LEE, TSH MEISSNER, UG AF BERNARD, V KAISER, N LEE, TSH MEISSNER, UG TI THRESHOLD PION ELECTROPRODUCTION IN CHIRAL PERTURBATION-THEORY SO PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS LA English DT Review ID LOW-ENERGY THEOREMS; VECTOR FORM-FACTOR; ONE LOOP; NUCLEON; SCATTERING; PHOTOPRODUCTION; LAGRANGIANS; CURRENTS; PROTON; MASSES AB Electroproduction of pions on the nucleon near the threshold is analyzed within the framework of baryon chiral perturbation theory. We give a thorough discussion of the low-energy theorems related to charged and neutral electropionproduction. It is shown how the axial radius of the nucleon can be related to the S-wave multipoles E(0+)((-)) and L(0+)((-)). The chiral perturbation theory calculations of the gamma*p --> pi(0)p reaction are found to be in good agreement with the recent near threshold data. We also discuss the influence of some isospin-breaking effects in this channel. For future experimental tests of the underlying chiral dynamics, extensive predictions of differential cross sections and multipole amplitudes are presented. C1 UNIV STRASBOURG 1,F-67037 STRASBOURG 2,FRANCE. TECH UNIV MUNICH,DEPT PHYS T30,D-85747 GARCHING,GERMANY. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. UNIV BERN,INST THEORET PHYS,CH-3012 BERN,SWITZERLAND. RP BERNARD, V (reprint author), CTR RECH NUCL,BP 28CR,F-67037 STRASBOURG 2,FRANCE. NR 53 TC 57 Z9 57 U1 0 U2 0 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 OCT PY 1994 VL 246 IS 6 BP 315 EP 363 DI 10.1016/0370-1573(94)90088-4 PG 49 WC Physics, Multidisciplinary SC Physics GA PP531 UT WOS:A1994PP53100001 ER PT J AU MARRS, RE BEIERSDORFER, P SCHNEIDER, D AF MARRS, RE BEIERSDORFER, P SCHNEIDER, D TI THE ELECTRON-BEAM ION-TRAP SO PHYSICS TODAY LA English DT Article ID EXCITATION CROSS-SECTIONS; HIGHLY CHARGED IONS; URANIUM IONS RP MARRS, RE (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA, USA. NR 18 TC 91 Z9 92 U1 0 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 OCT PY 1994 VL 47 IS 10 BP 27 EP 34 DI 10.1063/1.881419 PG 8 WC Physics, Multidisciplinary SC Physics GA PN153 UT WOS:A1994PN15300008 ER PT J AU CLARK, JW CAMPBELL, CE BAKER, GA DAPROVIDENCIA, J MARCH, N AF CLARK, JW CAMPBELL, CE BAKER, GA DAPROVIDENCIA, J MARCH, N TI AN UNFAIR FIRING IN FARGO SO PHYSICS TODAY LA English DT Letter C1 UNIV MINNESOTA TWIN CITIES,MINNEAPOLIS,MN. LOS ALAMOS NATL LAB,LOS ALAMOS,NM. UNIV COIMBRA,COIMBRA,PORTUGAL. UNIV OXFORD,OXFORD,ENGLAND. RP CLARK, JW (reprint author), WASHINGTON UNIV,ST LOUIS,MO 63130, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD OCT PY 1994 VL 47 IS 10 BP 90 EP 90 DI 10.1063/1.2808686 PG 1 WC Physics, Multidisciplinary SC Physics GA PN153 UT WOS:A1994PN15300019 ER PT J AU FAWCETT, T SIMON, WJ SWINHOE, R SHANKLIN, J NISHIDA, I CHRISTIE, WW SLABAS, AR AF FAWCETT, T SIMON, WJ SWINHOE, R SHANKLIN, J NISHIDA, I CHRISTIE, WW SLABAS, AR TI EXPRESSION OF MESSENGER-RNA AND STEADY-STATE LEVELS OF PROTEIN ISOFORMS OF ENOYL-ACP REDUCTASE FROM BRASSICA-NAPUS SO PLANT MOLECULAR BIOLOGY LA English DT Article DE BRASSICA NAPUS; ENOYL-ACP REDUCTASE; ISOFORMS; STEAROYL-ACP DESATURASE; DEVELOPMENTAL EXPRESSION; SEED ID ENOYL- REDUCTASE; MESSENGER-RNA; POLYPEPTIDES; PURIFICATION; TRANSLATION; EXTRACTION; INDUCTION; SEEDS AB The expression of mRNA and the steady-state levels of two-component enzymes of plant fatty acid synthetase (FAS) were studied. Northern analysis of enoyl-ACP reductase (ER) and stearoyl-ACP desaturase (SD) gene expression showed that steady-state levels of both transcripts increase during lipid deposition in the seed reaching a maximum al 29 days after flowering (DAF). The steady-state level of ER message falls very quickly after reaching its maximum, whereas the SD message is longer-lived. The levels of these specific mRNAs in seed are 15-30 times greater than in leaf. Optimum mRNA expression precedes the maximum levels of synthesis of the two proteins, which in turn precede the maximum level of oil. The expression of isoenzymes of ER were examined by two-dimensional western blotting in both leaf and seed tissue. Four enzymes are expressed in both of these tissues; the two most abundant isoforms in seed material are also the most abundant in leaf tissue. C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. NATL INST BASIC BIOL,OKAZAKI,AICHI 444,JAPAN. SCOTTISH CROP RES INST,DUNDEE DD2 5DA,SCOTLAND. RP FAWCETT, T (reprint author), UNIV DURHAM,DEPT BIOL SCI,LIPID MOLEC BIOL GRP,DURHAM DH1 3LE,ENGLAND. RI Nishida, Ikuo/E-3339-2010; Fawcett, Tony/O-8033-2015 OI Nishida, Ikuo/0000-0002-9649-349X; Fawcett, Tony/0000-0001-7657-0120 NR 14 TC 32 Z9 34 U1 1 U2 3 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0167-4412 J9 PLANT MOL BIOL JI Plant Mol.Biol. PD OCT PY 1994 VL 26 IS 1 BP 155 EP 163 DI 10.1007/BF00039528 PG 9 WC Biochemistry & Molecular Biology; Plant Sciences SC Biochemistry & Molecular Biology; Plant Sciences GA PQ589 UT WOS:A1994PQ58900016 PM 7948866 ER PT J AU CAHOON, EB BECKER, CK SHANKLIN, J OHLROGGE, JB AF CAHOON, EB BECKER, CK SHANKLIN, J OHLROGGE, JB TI CDNAS FOR ISOFORMS OF THE DELTA(9)-STEAROYL-ACYL CARRIER PROTEIN DESATURASE FROM THUNBERGIA-ALATA ENDOSPERM SO PLANT PHYSIOLOGY LA English DT Note ID NUCLEOTIDE-SEQUENCE; CLONE; PRECURSOR; ACID C1 MICHIGAN STATE UNIV,DEPT BOT & PLANT PATHOL,E LANSING,MI 48824. CALGENE INC,DAVIS,CA 95616. RP CAHOON, EB (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,BLDG 463,UPTON,NY 11973, USA. NR 10 TC 16 Z9 17 U1 0 U2 5 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD OCT PY 1994 VL 106 IS 2 BP 807 EP 808 DI 10.1104/pp.106.2.807 PG 2 WC Plant Sciences SC Plant Sciences GA PM921 UT WOS:A1994PM92100056 PM 7991701 ER PT J AU DOLAN, TJ AF DOLAN, TJ TI MAGNETIC ELECTROSTATIC PLASMA-CONFINEMENT SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Review ID ELECTROMAGNETIC TRAP; FUSION; MIRROR; LOSSES; BEAM AB Electrostatic plasma confinement and magnetic electrostatic plastic confinement (MEPC) have been studied tor four decades. The multiple potential well hypothesis, postulated to explain high neutron yields from Hirsch's colliding beam experiment, has been supported by several pieces of evidence, but results were inconclusive. Magnetic shielding of the grid was developed to reduce the required beam current and to prevent grid overheating. Electrostatic plugging of magnetic cusps evolved to a similar configuration. Due to low budgets, early MEPC experiments used spindle cusps, which are poor for plasma confinement. Later experiments used multipole cusps or a linear set of ring cusps, which have larger volumes of field-free plasma. To keep the self-shielding voltage drop DELTAphi less-than-or-equal-to 100 kV, the electron density n(a) in the anode gap should be less than about 10(19) m-3. The central plasma density can be an order of magnitude higher. The ATOLL toroidal quadrupole had anomalous electron energy transport, but the Jupiter-2M linear set of ring cusps achieved a transport rate about a factor of two above the classical Tate. With near-classical transport, a power gain ratio Q almost-equal-to 10 is predicted for a reactor with r(p) = 3m, B(a) = 6T, and applied voltage phi(A) = 400 kV. Besides producing electricity and synthetic fuels, MEPC reactors could be used for heavy ion beams sources and neutron generators. The main issues of concern for MEPC reactor development are electron transport, plasma purity and electrode alignment and voltage holding. RP DOLAN, TJ (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN,POB 1625,IDAHO FALLS,ID 83415, USA. NR 191 TC 30 Z9 30 U1 1 U2 8 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD OCT PY 1994 VL 36 IS 10 BP 1539 EP 1593 DI 10.1088/0741-3335/36/10/001 PG 55 WC Physics, Fluids & Plasmas SC Physics GA PM179 UT WOS:A1994PM17900001 ER PT J AU FARENGO, R SOBEHART, JR AF FARENGO, R SOBEHART, JR TI MINIMUM OHMIC DISSIPATION AND DC HELICITY INJECTION IN TOKAMAK-LIKE PLASMAS SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article ID SUSTAINMENT; RELAXATION AB The current and magnetic field profiles of a steady-state, tokamak-like plasma sustained by DC helicity injection are determined by assuming that the plasma relaxes to a state where the ohmic dissipation rate is minimum, Helicity balance is imposed as a constraint and the basic features required for DC helicity injection, a pair of electrodes magnetized by an externally produced flux, are included in a 2D model. The field is calculated self-consistently and only the values of experimentally controllable parameters are used. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP FARENGO, R (reprint author), COMIS NACL ENERGIA ATOM,DIV FUS NUCL GERENCIA DESARROLLO,AV LIBERTADOR 8250,RA-1429 BUENOS AIRES,DF,ARGENTINA. NR 17 TC 14 Z9 14 U1 2 U2 4 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD OCT PY 1994 VL 36 IS 10 BP 1691 EP 1700 DI 10.1088/0741-3335/36/10/008 PG 10 WC Physics, Fluids & Plasmas SC Physics GA PM179 UT WOS:A1994PM17900008 ER PT J AU HALE, LC SLOCUM, AH AF HALE, LC SLOCUM, AH TI DESIGN OF ANTI-BACKLASH TRANSMISSIONS FOR PRECISION POSITION CONTROL-SYSTEMS SO PRECISION ENGINEERING-JOURNAL OF THE AMERICAN SOCIETY FOR PRECISION ENGINEERING LA English DT Article DE ANTI-BACKLASH GEARS; POSITION CONTROL; PRELOAD AB Position control systems typical of machine tools and robots usually operate at relatively high torque and low speed. Although servo motors having these characteristics are now available, their cost, size, and weight generally exceed those of the traditional servo motor and gear reducer. Critical applications require transmissions with zero backlash and high stiffness, for which there are several solutions. This article reviews various anti-backlash techniques, discusses their subtleties and applications, develops models, and presents design methodologies. Although presented in the context of geared transmissions, the ideas also apply to other machine elements and situations requiring precision and robustness. Two case studies, a robot revolute joint and a machine tool axis of rotation, help to reinforce the theory and raise practical issues. RP HALE, LC (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 6 Z9 6 U1 0 U2 6 PU BUTTERWORTH-HEINEMANN PI WOBURN PA 225 WILDWOOD AVE #UNITB PO BOX 4500, WOBURN, MA 01801-2084 SN 0141-6359 J9 PRECIS ENG JI Precis. Eng.-J. Am. Soc. Precis. Eng. PD OCT PY 1994 VL 16 IS 4 BP 244 EP 258 DI 10.1016/0141-6359(94)90001-9 PG 15 WC Engineering, Multidisciplinary; Engineering, Manufacturing; Nanoscience & Nanotechnology; Instruments & Instrumentation SC Engineering; Science & Technology - Other Topics; Instruments & Instrumentation GA PL481 UT WOS:A1994PL48100001 ER PT J AU MORRIS, CR GARDNER, IA HIETALA, SK CARPENTER, TE ANDERSON, RJ PARKER, KM AF MORRIS, CR GARDNER, IA HIETALA, SK CARPENTER, TE ANDERSON, RJ PARKER, KM TI PERSISTENCE OF PASSIVELY ACQUIRED ANTIBODIES TO MYCOPLASMA-HYOPNEUMONIAE IN A SWINE HERD SO PREVENTIVE VETERINARY MEDICINE LA English DT Article ID LINKED-IMMUNOSORBENT-ASSAY; PIGS; SERUM; PNEUMONIA; MILK AB A cohort of 95 piglets born to 12 sows seropositive for Mycoplasma hyopneumoniae (MH) was followed from birth until passively acquired MH antibodies, detected with an ELISA, reached their lowest concentration. The objectives of the study were to determine the half-life of maternally derived MH antibodies in the newborn piglet, and the relationship between maternal MH antibodies in the serum or colostrum and the initial concentration and persistence of MH antibodies in the neonatal pigs. Blood samples were initially collected from newborn piglets at 4 days of age, and subsequently at 14-day intervals. Sows were blood-sampled 1 month prior to farrowing, and colostrum was collected 2-6 h after the first piglet was born. Antibody concentrations were expressed as the ELISA ratio between mean optical densities of the sample and the positive control (S/P ratio). Multiple linear regression models with sow pre-farrowing blood sample ratio (S-RATIO) or sow colostrum ratio (C-RATIO) and other covariates as predictors for initial S/P ratios explained 75% and 73%, respectively, of the variation in S/P ratios for 4-day-old piglets. The median half-life of MH antibodies was 15.8 days. The persistence of passively acquired MH antibodies was related to the initial antibody concentration in the piglet. Kaplan-Meier product-limit estimates of the time at which passive antibodies waned were 30, 45, and 63 days, for piglets with initial antibody concentration classified as low (less than or equal to 0.30), medium (0.31-0.65), or high (> 0.65), respectively. Accelerated failure time models were also fitted to the data with C-RATIO or S-RATIO as predictors for duration of passive antibodies in the piglet. Both models, which also included total piglet serum protein, sow parity, and breed of piglet, provided time estimates of antibody persistence that were consistent with the range detected in the study. C1 LAWRENCE LIVERMORE NATL LAB,SCH VET MED,DEPT MED & EPIDEMIOL,DAVIS,CA 95616. LAWRENCE LIVERMORE NATL LAB,THURMAN LAB,CALIF VET DIAGNOST LAB SYST,DAVIS,CA 95616. LAWRENCE LIVERMORE NATL LAB,DEPT ANIM SCI,DAVIS,CA 95616. NR 20 TC 27 Z9 27 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-5877 J9 PREV VET MED JI Prev. Vet. Med. PD OCT PY 1994 VL 21 IS 1 BP 29 EP 41 DI 10.1016/0167-5877(94)90030-2 PG 13 WC Veterinary Sciences SC Veterinary Sciences GA PP934 UT WOS:A1994PP93400003 ER PT J AU OSTER, MH URIUHARE, JY TRAPP, CL STERN, JS KEEN, CL AF OSTER, MH URIUHARE, JY TRAPP, CL STERN, JS KEEN, CL TI DIETARY MACRONUTRIENT COMPOSITION INFLUENCES TISSUE TRACE-ELEMENT ACCUMULATION IN DIABETIC SPRAGUE-DAWLEY RATS SO PROCEEDINGS OF THE SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE LA English DT Article ID MAGNESIUM-DEFICIENCY; ZUCKER RATS; FOOD-INTAKE; HIGH-FAT; MELLITUS; INSULIN; METABOLISM; MANGANESE; COPPER; ZINC AB The purpose of the present investigation was to study the role of two potential contributory factors, hyperphagia and alterations in fuel metabolism on the development of tissue trace element accumulation in the experimentally induced diabetic rat. The role of increased mineral intake associated with diabetic hyperphagia on tissue trace element accumulation was evaluated by feeding control and diabetic rats high-carbohydrate (HC) diets which varied in Zn, Cu, Mn, and Mg concentrations. Diabetic rats were hyperphagic and had lower plasma Mg, and higher liver Zn, Cu, and Mn concentrations than control rats, regardless of dietary mineral intake. In a second study, diabetic hyperphagia was reduced by feeding control and diabetic rats a HC, high-fat (HF), or high-protein (HP) diet; the effects of altering diabetic metabolism on trace element status was studied. Liver Mn and Zn concentrations of diabetic rats fed the HF diet were lower than diabetic rats fed the HC diet and HP diet, and were similar to control rats. Liver Cu concentrations of diabetic rats fed the HF and HP diets were lower than diabetic rats fed the HC diet and were similar to control rats. While diabetic rats, in general, had higher plasma glucagon concentrations and lower percent body fat than control rats, diabetic rats fed the HF diet had similar plasma glucagon and percent body fat to control rats. These data suggest that tissue-specific biochemical needs, such as the need for metals as cofactors for enzymes, rather than hyperphagia per se, may drive the accumulation of trace elements in the diabetic animal. C1 LAWRENCE LIVERMORE NATL LAB,DEPT INTERNAL MED,DAVIS,CA 95616. LAWRENCE LIVERMORE NATL LAB,FOOD INTAKE LAB,DAVIS,CA 95616. RP OSTER, MH (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT NUTR,DAVIS,CA 95616, USA. FU NICHD NIH HHS [HD07241, HD26777]; NIDDK NIH HHS [DK18899] NR 39 TC 9 Z9 9 U1 0 U2 0 PU BLACKWELL SCIENCE INC PI CAMBRIDGE PA 238 MAIN ST, CAMBRIDGE, MA 02142 SN 0037-9727 J9 P SOC EXP BIOL MED JI Proc. Soc. Exp. Biol. Med. PD OCT PY 1994 VL 207 IS 1 BP 67 EP 75 PG 9 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA PK018 UT WOS:A1994PK01800011 PM 7938039 ER PT J AU MCDONALD, RB MURTAGH, CM HORWITZ, BA AF MCDONALD, RB MURTAGH, CM HORWITZ, BA TI AGE AND GENDER EFFECTS ON GLUCOSE-UTILIZATION IN SKELETAL-MUSCLE AND BROWN ADIPOSE-TISSUE OF COLD-EXPOSED RATS SO PROCEEDINGS OF THE SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE LA English DT Article ID FISCHER 344 RATS; SPRAGUE-DAWLEY RATS; INSULIN-SECRETION; SHIVERING THERMOGENESIS; PERFUSED PANCREAS; BLOOD-FLOW; OLD RATS; EXERCISE; ADIPOCYTES; DIET AB We hypothesized that glucose utilization by skeletal muscle is less in cold-exposed older male versus female Fischer 344 (F344) rats and that this reduction may contribute to the poorer cold exposed thermoregulatory ability of the older males. To test this hypothesis, the rates of in vivo glucose utilization of skeletal muscle in 6-, 12-, and 26-month-old male and female F344 rats were estimated during cold exposure by measuring the cellular incorporation of [C-14]-2-deoxyglucose ([C-14]-2DG) after its conversion to [C-14]-2DG-6-phosphate ([C-14]-2DGP). Comparable measurements were also made in the interscapular brown fat depot (IBAT). Four-hour fasted rats, that had been fitted with femoral arterial and venous cannulae 24 hr earlier, were exposed to either 26 degrees or 6 degrees C for 2 hr and then received a bolus infusion of [C-14]-2DG (125 mu Cl/kg body wt). Arterial plasma glucose and [C-14]-2DG concentrations were measured periodically for an additional 45 min. Rats were sacrificed, and various skeletal muscles and IBAT were removed and immediately frozen in liquid N-2 for subsequent analysis of [C-14]-2DGP content. Cold-exposed male rats had significantly lower rectal temperatures than comparably treated females (26-month-old male, 34.8 degrees +/- 0.3 degrees; female, 36.1 degrees +/- 0.2 degrees C). There was no main effect of age, gender, or cold exposure on skeletal muscle glucose utilization when the data were expressed as nmol/min/g. In contrast, when data were expressed relative to total tissue weight (nmol/min), skeletal muscle glucose utilization was significantly higher in male than in female rats. Although estimated glucose utilization in IBAT (nmol/min/g) isolated from cold-exposed rats was significantly greater than that in brown fat isolated from non-cold-exposed animals, there was no main effect of age or gender. However, glucose utilization per IBAT depot (nmol/min) was significantly less in older male than in female rats, and reflected the fact that IBAT weight of older males was more than 50% lower than that of comparably aged females. Thus, our hypothesis that reduced skeletal muscle glucose utilization contributes to the blunted thermoregulatory ability of older male versus female F344 rats is negated. Rather, our data suggest that while the ability of brown adipocytes to utilize glucose does not appear to decline with age (as indicated by the absence of an age-related decrease in glucose utilization per gram of IBAT), the lower total depot glucose utilization of cold-exposed older males versus females may partially explain the previously reported gender difference in the thermogenic capacity of this tissue. C1 UNIV CALIF DAVIS,DIV BIOL SCI,NEUROBIOL SECT,DAVIS,CA 95616. RP MCDONALD, RB (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT NUTR,DAVIS,CA 95616, USA. FU NIA NIH HHS [AG06665, AG00429] NR 40 TC 16 Z9 16 U1 0 U2 0 PU BLACKWELL SCIENCE INC PI CAMBRIDGE PA 238 MAIN ST, CAMBRIDGE, MA 02142 SN 0037-9727 J9 P SOC EXP BIOL MED JI Proc. Soc. Exp. Biol. Med. PD OCT PY 1994 VL 207 IS 1 BP 102 EP 109 PG 8 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA PK018 UT WOS:A1994PK01800016 PM 7938027 ER PT J AU MITCHELL, AR PAGORIA, PF COON, CL JESSOP, ES POCO, JF TARVER, CM BREITHAUPT, RD MOODY, GL AF MITCHELL, AR PAGORIA, PF COON, CL JESSOP, ES POCO, JF TARVER, CM BREITHAUPT, RD MOODY, GL TI NITROUREAS .1. SYNTHESIS, SCALE-UP AND CHARACTERIZATION OF K-6 SO PROPELLANTS EXPLOSIVES PYROTECHNICS LA English DT Article AB The synthesis and characterization of 2-oxo-1,3,5-trinitro-1,3,5-triazacyclohexane (K-6), a cyclic dinitrourea, is described. The laboratory synthesis was scaled-up to provide 1.6 kilograms of crystalline K-6 which was used for performance testing. K-6 was formulated with 5% Viton A and pressed to 96.5% theoretical maximum density (TMD). Performance measurements in the form of front surface velocity measurements (tantalum plate push) and 1-inch cylinder expansion experiments indicate K-6 will out-perform HMX by 4% at early volume expansions. Thermal response and shock sensitivity experiments on K-6 are also described. RP MITCHELL, AR (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR ENERGET MAT,LIVERMORE,CA 94550, USA. NR 11 TC 31 Z9 38 U1 0 U2 3 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0721-3115 J9 PROPELL EXPLOS PYROT JI Propellants Explos. Pyrotech. PD OCT PY 1994 VL 19 IS 5 BP 232 EP 239 DI 10.1002/prep.19940190504 PG 8 WC Chemistry, Applied; Engineering, Chemical SC Chemistry; Engineering GA QD845 UT WOS:A1994QD84500003 ER PT J AU LOKESH, BR KINSELLA, JE AF LOKESH, BR KINSELLA, JE TI EFFECTS OF N-3 POLYUNSATURATED FATTY-ACIDS ON THE REACYLATION OF ARACHIDONIC-ACID IN PERITONEAL-MACROPHAGES SO PROSTAGLANDINS LEUKOTRIENES AND ESSENTIAL FATTY ACIDS LA English DT Article ID PROSTAGLANDIN SYNTHESIS; CELLULAR ARACHIDONATE; EICOSAPENTAENOIC ACID; DOCOSAHEXAENOIC ACID; ICOSANOID PRODUCTION; RELEASE; INHIBITION; PHOSPHOLIPASE; BIOSYNTHESIS; EICOSANOIDS AB Mouse peritoneal macrophages mere prelabelled with [H-3]AA and activated ex vivo with phorbol myristate acetate (PMA) in the presence or absence of added n-3 polyunsaturated fatty acids (n-3 PUFA). The n-3 PUFA did not affect the release of [H-3]AA from stimulated macrophages. Added AA, enhanced, in a dose-dependent manner, the amount of free [H-3]AA in the medium after activating the cells with PMA. Both n-3 PUFA and AA were actively acylated into the lipids of PMA activated macrophages, but the n-3 PUFA did not compete with reacylation of AA. In unstimulated cells, in the absence of PMA, n-3 PUFA effectively competed with AA for acylation into membrane phospholipids. These studies suggest that distinct pools of AA exist in macrophages. C1 CENT FOOD TECHNOL RES INST,DEPT BIOCHEM & NUTR,MYSORE 570013,KARNATAKA,INDIA. RP LOKESH, BR (reprint author), LAWRENCE LIVERMORE NATL LAB,LIPIDS RES GRP,DAVIS,CA 95616, USA. NR 41 TC 5 Z9 5 U1 0 U2 0 PU CHURCHILL LIVINGSTONE PI EDINBURGH PA JOURNAL PRODUCTION DEPT, ROBERT STEVENSON HOUSE, 1-3 BAXTERS PLACE, LEITH WALK, EDINBURGH, MIDLOTHIAN, SCOTLAND EH1 3AF SN 0952-3278 J9 PROSTAG LEUKOTR ESS JI Prostaglandins Leukot. Essent. Fatty Acids PD OCT PY 1994 VL 51 IS 4 BP 235 EP 239 DI 10.1016/0952-3278(94)90185-6 PG 5 WC Biochemistry & Molecular Biology; Cell Biology; Endocrinology & Metabolism SC Biochemistry & Molecular Biology; Cell Biology; Endocrinology & Metabolism GA PH453 UT WOS:A1994PH45300003 PM 7846090 ER PT J AU EISENBERG, D AF EISENBERG, D TI PERUTZ,MAX ACHIEVEMENTS - HOW DID HE DO IT SO PROTEIN SCIENCE LA English DT Editorial Material C1 UNIV CALIF LOS ANGELES,DEPT CHEM & BIOCHEM,LOS ANGELES,CA 90024. RP EISENBERG, D (reprint author), UNIV CALIF LOS ANGELES,DOE,INST MOLEC BIOL,STRUCT BIOL & MOLEC MED LAB,LOS ANGELES,CA 90024, USA. NR 15 TC 4 Z9 4 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD OCT PY 1994 VL 3 IS 10 BP 1625 EP 1628 PG 4 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA PR260 UT WOS:A1994PR26000001 PM 7849579 ER PT J AU DAMBERGER, FF PELTON, JG HARRISON, CJ NELSON, HCM WEMMER, DE AF DAMBERGER, FF PELTON, JG HARRISON, CJ NELSON, HCM WEMMER, DE TI SOLUTION STRUCTURE OF THE DNA-BINDING DOMAIN OF THE HEAT-SHOCK TRANSCRIPTION FACTOR DETERMINED BY MULTIDIMENSIONAL HETERONUCLEAR MAGNETIC-RESONANCE SPECTROSCOPY SO PROTEIN SCIENCE LA English DT Article DE COMPARISON TO CRYSTAL STRUCTURE; DNA-BINDING; HEAT SHOCK FACTOR; HELIX-TURN-HELIX; NMR; PROTEIN STRUCTURE ID 3-DIMENSIONAL SOLUTION STRUCTURE; ISOTOPICALLY ENRICHED PROTEINS; SIDE-CHAIN H-1; NMR-SPECTROSCOPY; SECONDARY STRUCTURE; COUPLING-CONSTANTS; DISTANCE GEOMETRY; ESCHERICHIA-COLI; RNA-POLYMERASE; C-ALPHA AB The solution structure of the 92-residue DNA-binding domain of the heat shock transcription factor from Kluyveromyces lactis has been determined using multidimensional NMR methods. Three-dimensional (3D) triple resonance, H-1-C-13-C-13-H-1 total correlation spectroscopy, and N-15-separated total correlation spectroscopy-heteronuclear multiple quantum correlation experiments were used along with various 2D spectra to make nearly complete assignments for the backbone and side-chain H-1, N-15, and C-13 resonances. Five-hundred eighty-three NOE constraints identified in 3D C-13- and N-15-separated NOE spectroscopy (NOESY)-heteronuclear multiple quantum correlation spectra and a 4-dimensional C-13/C-13-edited NOESY spectrum, along with 35 phi, 9(chi 1), and 30 hydrogen bond constraints, were used to calculate 30 structures by a hybrid distance geometry/simulated annealing protocol, of which 24 were used for structural comparison. The calculations revealed that a 3-helix bundle packs against a small 4-stranded antiparallel beta-sheet. The backbone RMS deviation (RMSD) for the family of structures was 1.03 +/- 0.19 Angstrom with respect to the average structure. The topology is analogous to that of the C-terminal domain of the catabolite gene activator protein and appears to be in the helix-turn-helix family of DNA-binding proteins. The overall fold determined by the NMR data is consistent with recent crystallographic work on this domain (Harrison CJ, Bohm AA, Nelson HCM, 1994, Science 263:224) as evidenced by RMSD between backbone atoms in the NMR and X-ray structures of 1.77 +/- 0.20 Angstrom. Several differences were identified some of which may be due to protein-protein interactions in the crystal. C1 UNIV CALIF BERKELEY,DEPT CHEM,BIOPHYS GRAD GRP,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI Damberger, Fred/A-8938-2011 OI Damberger, Fred/0000-0002-8457-3409 FU NIGMS NIH HHS [GM 44086] NR 88 TC 57 Z9 60 U1 0 U2 4 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD OCT PY 1994 VL 3 IS 10 BP 1806 EP 1821 PG 16 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA PR260 UT WOS:A1994PR26000020 PM 7849597 ER PT J AU TUCKER, JD SENFT, JR AF TUCKER, JD SENFT, JR TI ANALYSIS OF NATURALLY-OCCURRING AND RADIATION-INDUCED BREAKPOINT LOCATIONS IN HUMAN CHROMOSOME-1, CHROMOSOME-2 AND CHROMOSOME-4 SO RADIATION RESEARCH LA English DT Article ID NONRANDOM DISTRIBUTION; IONIZING-RADIATION; LYMPHOCYTES; ABERRATIONS; BREAKS; LOCALIZATION; EXPOSURE; POINTS AB The locations of observed breaks in three pairs of painted chromosomes from radiation-exposed and unexposed human peripheral blood lymphocytes are described. No difference in the observed breakpoint locations was seen from people exposed at Chernobyl, from healthy controls or from blood exposed to 2 Gy Cs-137 in vitro. However, the distribution of observed breaks within the painted chromosomes was not random. Fewer breaks and rearrangements were observed near the ends of the chromosome arms. Three explanations for these findings were considered: cell selection, non-random efficiency of detection and non-random breakage or repair. Cell selection does not appear to be plausible because the distribution of observed breaks induced in vitro is not different from those induced in vivo. Non-random efficiency of detection is not RP TUCKER, JD (reprint author), LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,POB 808,L-452,LIVERMORE,CA 94551, USA. FU NCI NIH HHS [P01 CA59431] NR 28 TC 68 Z9 71 U1 0 U2 0 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD OCT PY 1994 VL 140 IS 1 BP 31 EP 36 DI 10.2307/3578565 PG 6 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA PK821 UT WOS:A1994PK82100005 PM 7938452 ER PT J AU HOWELL, RW KASSIS, AI ADELSTEIN, SJ RAO, DV WRIGHT, HA HAMM, RN TURNER, JE SASTRY, KSR AF HOWELL, RW KASSIS, AI ADELSTEIN, SJ RAO, DV WRIGHT, HA HAMM, RN TURNER, JE SASTRY, KSR TI RADIOTOXICITY OF PLATINUM-195M-LABELED TRANS-PLATINUM(II) IN MAMMALIAN-CELLS SO RADIATION RESEARCH LA English DT Article ID GROUP NO 6; MOUSE TESTES; AUGER ELECTRONS; CYTO-TOXICITY; I-125; NUCLEAR; I125; DNA; RADIATION; DOSIMETRY AB The chemotoxicity and radiotoxicity of trans-dichloro-diammineplatinum (II) labeled with Pt-195m (trans-Pt-195m) are investigated to ascertain the potential of radioplatinum coordination complexes as antineoplastic agents. Platinum-195m, with a half-life of about 4 days, is a prolific emitter of low-energy Auger electrons because of the high probability of internal conversion in its isomeric transitions. The kinetics of cellular uptake and retention after incubation and the radiotoxicity of this Auger electron emitter in the form of trans-Pt-195m is investigated using cells of the Chinese hamster V79 cell line. The cellular uptake of Pt-195m reaches a plateau in about 3 to 5 h of incubation and varies nonlinearly with the extracellular concentration of radioactivity. The radioactivity is eliminated from the cells after incubation with an effective half-life of 24 h. Cell survival data, when corrected for the chemical toxicity of nonradiolabeled trans-platinum, give a cell survival curve typical for radiations with high linear energy transfer. At 37% survival, the mean lethal cellular uptake is about 1.0 mBq/cell. Dosimetric considerations, based on subcellular distribution of the radionuclide, yield a value of 4.8 for the relative biological effectiveness when compared with 250 kVp X rays. Theoretical Monte Carlo track-structure calculations indicate that the density of radical species produced in liquid water in the immediate vicinity of a Pt-195m decay site is substantially greater than the density of species along the track of a 5.3 MeV alpha particle. This explains qualitatively the efficacy of Pt-195m in causing high-LET radiation type biological effects. The extreme radiotoxicity of intranuclearly localized Pt-195m, in conjunction with the proclivity of platinum chemotherapy agents to bind to DNA in the cell nucleus, suggests that the combination of chemical effects and the effects of Auger electrons that can be obtained with radio-platinum coordination complexes may have potential in the treatment of cancer. C1 HARVARD UNIV,SCH MED,DEPT RADIOL,SHIELDS WARREN RADIAT LAB,BOSTON,MA 02115. OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831. UNIV MASSACHUSETTS,DEPT PHYS & ASTRON,AMHERST,MA 01003. RP HOWELL, RW (reprint author), UNIV MED & DENT NEW JERSEY,NEW JERSEY MED SCH,DEPT RADIOL,MSB F-451,185 S ORANGE AVE,NEWARK,NJ 07103, USA. FU NCI NIH HHS [CA-32877, CA-15523] NR 48 TC 37 Z9 38 U1 0 U2 3 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD OCT PY 1994 VL 140 IS 1 BP 55 EP 62 DI 10.2307/3578568 PG 8 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA PK821 UT WOS:A1994PK82100008 PM 7938455 ER PT J AU BENNETT, BD MUMFORDZISK, J CODERRE, JA MORRISON, GH AF BENNETT, BD MUMFORDZISK, J CODERRE, JA MORRISON, GH TI SUBCELLULAR-LOCALIZATION OF P-BORONOPHENYLALANINE-DELIVERED B-10 IN THE RAT 9L GLIOSARCOMA - CRYOGENIC PREPARATION IN-VITRO AND IN-VIVO SO RADIATION RESEARCH LA English DT Article ID NEUTRON-CAPTURE THERAPY; RELATIVE BIOLOGICAL EFFECTIVENESS; ION MICROSCOPIC ANALYSIS; DRIED CULTURED-CELLS; B-10(N,ALPHA)LI-7 REACTION; CALCIUM; MELANOMA; TISSUE; RESOLUTION; TUMORS AB A well-characterized in vitro cryogenic preparation for ion microscopic isotope imaging, which minimizes redistribution of diffusible species, was used to determine the distribution of boron in GS-9L gliosarcoma cells incubated with the boron neutron capture therapy agent, p-boronophenylalanine (BPA). At the subcellular level, boron from BPA distributes relatively homogeneously within the glioma cell. Boron from BPA was eliminated rapidly, indicating that most is unbound. Thus a large pool of boron is susceptible to diffusion artifact. Removal of this artifact increases the degree of confidence in microdosimetric results inferred from the homogeneous subcellular distribution. The ion microscopic imaging of boron in subcutaneous tumors cryofixed in situ was achieved in rats treated with BPA. Boron signals from BPA were adequate to image microdistributions at the 1-mu m resolution level. As in the in vitro case, boron did not localize discretely at the subcellular level. However, boron heterogeneity was seen at the tissue level. Physiologically valid cellular potassium and sodium levels were seen, which demonstrates minimized redistribution artifact. Future tissue studies designed to correlate ion microscopic boron images to microscopic structure are feasible using cryogenic sample preparation and ion microscopy, C1 CORNELL UNIV,DEPT CHEM,ITHACA,NY 14853. BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. NR 32 TC 15 Z9 16 U1 0 U2 0 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD OCT PY 1994 VL 140 IS 1 BP 72 EP 78 DI 10.2307/3578570 PG 7 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA PK821 UT WOS:A1994PK82100010 PM 7938457 ER PT J AU LIBERTIN, CR PANOZZO, J GROH, KR CHANGLIU, CM SCHRECK, S WOLOSCHAK, GE AF LIBERTIN, CR PANOZZO, J GROH, KR CHANGLIU, CM SCHRECK, S WOLOSCHAK, GE TI EFFECTS OF GAMMA-RAYS, ULTRAVIOLET-RADIATION, SUNLIGHT, MICROWAVES AND ELECTROMAGNETIC-FIELDS ON GENE-EXPRESSION MEDIATED BY HUMAN-IMMUNODEFICIENCY-VIRUS PROMOTER SO RADIATION RESEARCH LA English DT Article ID LONG TERMINAL REPEAT; LOW-LET RADIATIONS; PROTEIN-KINASE-C; CYTOSKELETAL ELEMENTS; IONIZING-RADIATION; HUMAN-CELLS; DNA DAMAGE; TYPE-1; MODULATION; ACTIVATION AB Previous work by our group and others has shown the modulation of human immunodeficiency virus (HIV) promoter or long terminal repeat (LTR) after exposure to neutrons and ultraviolet radiations. Using HeLa cells stably transfected with a construct containing the chloramphenicol acetyl transferase (CAT) gene, the transcription of which is mediated by the HIV-LTR, we designed experiments to examine the effects of exposure to different types of radiation (such as gamma rays, ultraviolet and sunlight irradiations, electromagnetic fields and microwaves) on HIV-LTR-driven expression of CAT. These results demonstrated ultraviolet-light-induced transcription from the HIV promoter, as has been shown by others. Exposure to other DNA-damaging agents such as gamma rays and sunlight (with limited exposures) had no significant effect on transcription mediated by HIV-LTR, suggesting that induction of HIV is not mediated by just any type of DNA damage but rather may require specific types of DNA damage. Microwaves did not cause cell killing when cells in culture were exposed in high volumes of medium, and the same cells showed no changes in expression. When microwave exposure was carried out in low volumes of medium (so that excessive heat was generated) induction of HIV-LTR transcription (as assayed by CAT activity) was evident. Electromagnetic field exposures had no effect on expression of HIV-LTR. These results demonstrate that not all types of radiation and not all DNA-damaging agents are capable of inducing HIV. We hypothesize that induction of HIV transcription may be mediated by several different signals after exposure to radiation. C1 ARGONNE NATL LAB,CTR MECHANIST BIOL & BIOTECHNOL,ARGONNE,IL 60439. LOYOLA UNIV,MED CTR,DEPT PATHOL,MAYWOOD,IL 60513. LOYOLA UNIV,MED CTR,DEPT MED,MAYWOOD,IL 60513. RI Woloschak, Gayle/A-3799-2017 OI Woloschak, Gayle/0000-0001-9209-8954 NR 22 TC 16 Z9 16 U1 0 U2 1 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD OCT PY 1994 VL 140 IS 1 BP 91 EP 96 DI 10.2307/3578573 PG 6 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA PK821 UT WOS:A1994PK82100013 PM 7938460 ER PT J AU CIESIELSKI, B WIELOPOLSKI, L AF CIESIELSKI, B WIELOPOLSKI, L TI THE EFFECTS OF DOSE AND RADIATION QUALITY ON THE SHAPE AND POWER SATURATION OF THE EPR SIGNAL IN ALANINE SO RADIATION RESEARCH LA English DT Article ID L-ALPHA-ALANINE; FAST-NEUTRON; DOSIMETRY; IRRADIATION; RESONANCE; SYSTEM; ENERGY; ESR AB Variations in the shape and the power saturation of EPR spectra of L-alanine irradiated with photons, electrons, neutrons and protons are reported. It is shown that the ratio of the intensities of the satellite lines attributable to ''spin flips'' and the central line depend on the EPR microwave power, and it is proposed as a quantitative measure of the signal saturation effect. Dependence of this ratio on the microwave power is affected by the radiation quality and for doses in excess of 10 kGy by the absorbed dose. At high doses of low-LET radiation these changes are attributed to a high local density of free radicals, while for low doses of high-LET radiation these are due to changes induced in the crystal lattice. Consequently, the conventional peak-to-peak amplitude measurement of the EPR signal intensity is inaccurate when used for high doses and for comparison between radiations with different beam quality. The possibility to determine radiation quality from an EPR measurement is discussed. C1 SUNY STONY BROOK,BROOKHAVEN NATL LAB,RADIAT THERAPY FACIL,UPTON,NY 11973. MED ACAD GDANSK,DEPT PHYS & BIOPHYS,PL-80211 GDANSK,POLAND. OI Ciesielski, Bartlomiej/0000-0001-8091-6040 FU FIC NIH HHS [IF05 TW04614-01 ICP(5)] NR 29 TC 43 Z9 44 U1 0 U2 2 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD OCT PY 1994 VL 140 IS 1 BP 105 EP 111 DI 10.2307/3578575 PG 7 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA PK821 UT WOS:A1994PK82100015 PM 7938443 ER PT J AU RIBEIRO, FH SOMORJAI, GA AF RIBEIRO, FH SOMORJAI, GA TI THE FABRICATION OF HIGH-TECHNOLOGY CATALYSTS SO RECUEIL DES TRAVAUX CHIMIQUES DES PAYS-BAS-JOURNAL OF THE ROYAL NETHERLANDS CHEMICAL SOCIETY LA English DT Article DE ZEOLITES; ATOMIC LAYER EPITAXY (ALE); SUBSTRATE SPINNING; ELECTRON-BEAM LITHOGRAPHY ID PALLADIUM PARTICLES; MICROSCOPY; OXIDATION; CLUSTERS AB To produce reaction products with 100% chemical selectivity, and to attain much higher turnover rates and number of turnovers, the development of new methods of catalyst preparation are necessary. Precise control of particle size, the separation between catalyst particles and their superior chemical and thermal stability must be achieved. To this end, five new methods of preparation of high-technology catalysts are being studied. These are: (A) the method successfully used by W.M.H. Sachtler for metal particle deposition in zeolite cages, (B) the deposition of metal particles by atomic layer epitaxy, (C) controlled nucleation and growth of metal particles by substrate spinning, (D) deposition of metals on oxides by evaporation, (E) preparation of ordered metal arrays by electron-beam lithography using microelectronic techniques. These different methods are described and discussed, and their present states of development are assessed. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV SCI MAT,BERKELEY,CA 94720. RP RIBEIRO, FH (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. OI Ribeiro, Fabio/0000-0001-7752-461X NR 12 TC 31 Z9 31 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-0513 J9 RECL TRAV CHIM PAY B JI Recl. Trav. Chim. Pays-Bas-J. Roy. Neth. Chem. Soc. PD OCT PY 1994 VL 113 IS 10 BP 419 EP 422 PG 4 WC Chemistry, Multidisciplinary SC Chemistry GA PQ080 UT WOS:A1994PQ08000002 ER PT J AU SCHIPPER, L AF SCHIPPER, L TI ENERGY-CONSERVATION AND TRANSFER OF TECHNOLOGY SO RESOURCES CONSERVATION AND RECYCLING LA English DT Article; Proceedings Paper CT Seminar on Energy for Sustainable Development CY SEP 07, 1993 CL AMSTERDAM, NETHERLANDS SP DUTCH MINIST FOREIGN AFFAIRS DGIS, DIRECTORATE GEN INT COOPERAT, NETHERLANDS AGCY ENERGY & ENVIRONMENT NOVEM, DUTCH MINIST HOUSING, SPATIAL PLANNING & ENGIRONMENT VROM RP SCHIPPER, L (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-3449 J9 RESOUR CONSERV RECY JI Resour. Conserv. Recycl. PD OCT PY 1994 VL 12 IS 1-2 BP 75 EP 86 DI 10.1016/0921-3449(94)90068-X PG 12 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA PW063 UT WOS:A1994PW06300013 ER PT J AU BROWN, IG AF BROWN, IG TI VACUUM-ARC ION SOURCES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Review ID CHARGE-STATE DISTRIBUTIONS; BROAD-BEAM; IMPLANTATION FACILITY; SURFACE MODIFICATION; CATHODE EROSION; PLASMA; IONIZATION; TRANSPORT; EXTRACTION; GENERATION AB The vacuum arc is a rich source of highly ionized metal plasma that can be used to make a high current metal ion source. Vacuum arc ion sources have been developed for a range of applications including ion implantation for materials surface modification, particle accelerator injection for fundamental nuclear physics research, and other fundamental and applied purposes. The beam parameters can be attractive, and the source has provided a valuable addition to the spectrum of ion sources available to the experimenter. Beams have been produced from over 50 of the solid metals of the periodic table, with mean ion energy up to several hundred keV and with beam current up to several amperes. Typically the source is repetitively pulsed with pulse length of order a millisecond and duty cycle of order 1%, and operation of a dc embodiment has been demonstrated. Here the source fundamentals and operation are reviewed, the source and beam characteristics summarized, and some applications examined. RP BROWN, IG (reprint author), LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. NR 134 TC 336 Z9 343 U1 4 U2 30 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0034-6748 EI 1089-7623 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1994 VL 65 IS 10 BP 3061 EP 3082 DI 10.1063/1.1144756 PG 22 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA PL968 UT WOS:A1994PL96800001 ER PT J AU CHU, B YEH, FG LI, YJ HARNEY, PJ ROUSSEAU, J DAROVSKY, A SIDDONS, DP AF CHU, B YEH, FG LI, YJ HARNEY, PJ ROUSSEAU, J DAROVSKY, A SIDDONS, DP TI CONSTRUCTION OF A HIGH-ENERGY BONSE-HART ULTRASMALL-ANGLE X-RAY-SCATTERING INSTRUMENT SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID SYNCHROTRON RADIATION AB A Bonse-Hart ultrasmall-angle x-ray scattering (USAXS) instrument, employing a synchrotron x-ray source at an energy of 18.86 keV (wavelength lambda = 0.06573 nm), has been designed, constructed, and tested. Solid as well as suspensions of polystyrene and poly(chlorostyrene) latex spheres were used as reference standards in order to demonstrate the range of this instrument. The USAXS results measured at lambda = 0.06573 nm were also compared with those from a calibrated Bonse-Hart instrument operating at lambda = 0.154 nm, i.e., the standard Cu K(alpha) radiation. The higher-energy synchrotron x rays permit us to study absorbing and/or opaque materials having long range inhomogeneities in the order of microns. Furthermore, for many polymer systems, the optimal sample thickness at lambdacongruent-to0.066 nm is increased to approximately 10 mm and thin-walled glass windows become acceptable. Thus, a cylindrical light-scattering cell with a wall thickness of 0.3 mm could be used for both USAXS and laser light scattering measurements. The main hurdle for performing simultaneous static and dynamic light scattering as well as USAXS experiments on polymer solutions and gels with the same sample has been resolved. This capability should open up new frontiers in structural and dynamical studies of systems involving a large range of length scales from angstroms to microns. C1 BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,SUNY X3 BEAMLINE,UPTON,NY 11973. RP CHU, B (reprint author), SUNY STONY BROOK,DEPT CHEM,STONY BROOK,NY 11794, USA. NR 15 TC 8 Z9 8 U1 1 U2 2 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 OCT PY 1994 VL 65 IS 10 BP 3233 EP 3237 DI 10.1063/1.1144556 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA PL968 UT WOS:A1994PL96800027 ER PT J AU FEHL, DL MURON, DJ SUJKA, BR VEHAR, DW LORENCE, LJ WESTFALL, RL JONES, SC SWEET, JA BRAUNLICH, P AF FEHL, DL MURON, DJ SUJKA, BR VEHAR, DW LORENCE, LJ WESTFALL, RL JONES, SC SWEET, JA BRAUNLICH, P TI CHARACTERIZATION OF A 2-DIMENSIONAL, THERMOLUMINESCENT, DOSE-MAPPING SYSTEM - UNIFORMITY, REPRODUCIBILITY, AND CALIBRATIONS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID LASER AB Initial testing of a new, commercially available, thermoluminescent dosimetry system is reported. The radiation detectors consist of two-dimensional arrays of 10(4) CaF2:Mn dosimeters, deposited on flexible polyimide sheets. The spatial resolution is 3 mm, and the combined thickness of the dosimeters and the substrate is 185 mum. Exposed sheets are processed by laser heating. This system is compatible with intense, pulsed Bremsstrahlung fields and electronics hardness testing. A two-step calibration procedure is described. In spatial uniformity tests at 66 Gy the detectors exhibited random fluctuations of 1%-3% superposed on broad spatial drifts of approximately +/- 5%. Reproducibility for strips of 288 elements, cut from sheets and given absorbed doses of 100 Gy, was approximately 2%. For absorbed doses in the 10 Gy-1.5 kGy range, response vs exposure curves show reasonable features of linearity, supralinearity, and saturation for CaF2:Mn phosphor. Small systematic effects (<7%) can be observed for sheets and strips stacked during exposure; these effects are explained by radiation transport calculations and impact the dosimetric technique. C1 INT SENSOR TECHNOL INC,PULLMAN,WA 99163. RP FEHL, DL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 26 TC 11 Z9 11 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1994 VL 65 IS 10 BP 3243 EP 3251 DI 10.1063/1.1144558 PG 9 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA PL968 UT WOS:A1994PL96800029 ER PT J AU BLATTER, G FEIGELMAN, MV GESHKENBEIN, VB LARKIN, AI VINOKUR, VM AF BLATTER, G FEIGELMAN, MV GESHKENBEIN, VB LARKIN, AI VINOKUR, VM TI VORTICES IN HIGH-TEMPERATURE SUPERCONDUCTORS SO REVIEWS OF MODERN PHYSICS LA English DT Review ID HIGH-TC SUPERCONDUCTORS; FLUX-LINE-LATTICE; BA-CU-O; UPPER CRITICAL-FIELD; KOSTERLITZ-THOULESS TRANSITION; YBA2CU3O7 SINGLE-CRYSTALS; ISING SPIN-GLASSES; CHARGE-DENSITY WAVES; 2-DIMENSIONAL VORTEX GLASSES; LOWER CRITICAL DIMENSION C1 ASEA BROWN BOVERI, CORP RES, CH-5405 BADEN, SWITZERLAND. LD LANDAU THEORET PHYS INST, MOSCOW 117940, RUSSIA. WEIZMANN INST SCI, IL-76100 REHOVOT, ISRAEL. ARGONNE NATL LAB, ARGONNE, IL 60439 USA. RP BLATTER, G (reprint author), ETH ZURICH, CH-8093 ZURICH, SWITZERLAND. RI Feigelman, Mikhail/M-4113-2013 NR 633 TC 4335 Z9 4359 U1 57 U2 420 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0034-6861 EI 1539-0756 J9 REV MOD PHYS JI Rev. Mod. Phys. PD OCT PY 1994 VL 66 IS 4 BP 1125 EP 1388 DI 10.1103/RevModPhys.66.1125 PG 264 WC Physics, Multidisciplinary SC Physics GA QE127 UT WOS:A1994QE12700001 ER PT J AU METZ, WC AF METZ, WC TI POTENTIAL NEGATIVE IMPACTS OF NUCLEAR ACTIVITIES ON LOCAL ECONOMIES - RETHINKING THE ISSUE SO RISK ANALYSIS LA English DT Article DE RISK; PERCEPTIONS; SURVEYS; BEHAVIOR; NUCLEAR ID PERCEIVED RISK; WASTE REPOSITORY; STIGMA; NEVADA AB Surveys of public opinion about perceptions of risk associated with the nuclear fuel cycle have shown that the public professes a widespread feeling of dread, a fear of associated stigmas, and a concern about possible catastrophic nuclear accidents. Various interest groups and state governments that oppose congressionally mandated siting of centralized high-level radioactive waste (HLW) storage and disposal facilities are using this negative imagery to create a powerful, emotional obstacle to the siting process. From statistical analyses of images and location preferences, researchers have claimed that possible significant economic losses could potentially accompany the siting of HLW facilities. However, several paradoxes, or self-contradictory statements, apparently exist between the responses expressed in surveys and the actual economic and demographic behavior evidenced in the marketplace. Federal policymakers need to evaluate whether the request for a change in siting policy is based on subjective fear of a potential negative economic effect or on proven negative effects. Empirically observed behavior does not support predicted negative economic effects based on survey responses. RP METZ, WC (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Johnson, Marilyn/E-7209-2011 NR 39 TC 13 Z9 13 U1 1 U2 3 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD OCT PY 1994 VL 14 IS 5 BP 763 EP 770 DI 10.1111/j.1539-6924.1994.tb00286.x PG 8 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA PT370 UT WOS:A1994PT37000007 ER PT J AU HUNTER, RL LAYTON, DW ANSPAUGH, LR AF HUNTER, RL LAYTON, DW ANSPAUGH, LR TI OPPORTUNITIES AND IMPEDIMENTS FOR RISK-BASED STANDARDS - SOME VIEWS FROM A WORKSHOP SO RISK ANALYSIS LA English DT Article DE RISK-BASED STANDARDS; DEPARTMENT OF ENERGY; CLEANUP; RISK ID PERCEPTION AB Techniques for performing scientific risk assessments for a wide variety of chemical and radiological hazards present in the environment and workplace are available. Speakers at a workshop sponsored by the Environmental and Public/Occupational Health Standard's Steering Group addressed both the state-of-the-art in risk assessment and areas of difficulty that require further research. The Steering Group concluded that within the limits of the available data, risk-assessment techniques are a useful tool in decision-making. In the past, many government agencies have not been effective either in listening to public concerns or in communicating technical or scientific information about risks. This has been true at all levels of government. Workshop speakers discussed some ways that government agencies can more effectively communicate with the public. The Steering Group concluded that major efforts must be made to ensure that two-way communication takes place. Thus the results of the workshop show that effective management of risk requires both a scientific assessment of risk and a responsive consideration of the public's perception of risk. Intensive efforts must be made to ensure that effective two-way communication takes place between members of the public and the appropriate government agencies. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP HUNTER, RL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 12 TC 1 Z9 1 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD OCT PY 1994 VL 14 IS 5 BP 863 EP 868 DI 10.1111/j.1539-6924.1994.tb00299.x PG 6 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA PT370 UT WOS:A1994PT37000020 ER PT J AU WHITE, RK AF WHITE, RK TI ONCOGENE AND TRANSGENICS CORRELATES OF CANCER RISK ASSESSMENT - ZERVOS,L SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,DIV HLTH SCI RES,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD OCT PY 1994 VL 14 IS 5 BP 869 EP 869 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA PT370 UT WOS:A1994PT37000021 ER PT J AU WHITE, RK AF WHITE, RK TI SPSS/PC+ MADE SIMPLE - KINNEAR,PR, GRAY,CD SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,DIV HLTH SCI RES,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD OCT PY 1994 VL 14 IS 5 BP 869 EP 869 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA PT370 UT WOS:A1994PT37000022 ER PT J AU WHITE, RK AF WHITE, RK TI PARADOXES OF BELIEF AND STRATEGIC RATIONALITY - KOON,RC SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,DIV HLTH SCI RES,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 3 U2 14 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD OCT PY 1994 VL 14 IS 5 BP 870 EP 870 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA PT370 UT WOS:A1994PT37000025 ER PT J AU WHITE, RK AF WHITE, RK TI FLOODPLAIN MANAGEMENT IN THE UNITED-STATES - AN ASSESSMENT REPORT SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,DIV HLTH SCI RES,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 3 U2 14 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD OCT PY 1994 VL 14 IS 5 BP 870 EP 870 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA PT370 UT WOS:A1994PT37000024 ER PT J AU WHITE, RK AF WHITE, RK TI THE CHEMISTRY OF ENVIRONMENTAL TOBACCO-SMOKE - COMPOSITION AND MEASUREMENT - GUERIN,MR, JENKINS,RA, TOMKINS,BA SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,DIV HLTH SCI RES,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 3 U2 14 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD OCT PY 1994 VL 14 IS 5 BP 870 EP 871 PG 2 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA PT370 UT WOS:A1994PT37000026 ER PT J AU WHITE, RK AF WHITE, RK TI RISK - ANALYSIS, PERCEPTION AND MANAGEMENT SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,DIV HLTH SCI RES,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 3 U2 14 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD OCT PY 1994 VL 14 IS 5 BP 870 EP 870 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA PT370 UT WOS:A1994PT37000023 ER PT J AU WHITE, RK AF WHITE, RK TI STATISTICAL-METHODS FOR SURVIVAL-DATA ANALYSIS - LEE,ET SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,DIV HLTH SCI RES,OAK RIDGE,TN 37831, USA. NR 1 TC 1 Z9 1 U1 2 U2 6 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD OCT PY 1994 VL 14 IS 5 BP 871 EP 871 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA PT370 UT WOS:A1994PT37000028 ER PT J AU WHITE, RK AF WHITE, RK TI RISK-TAKING BEHAVIOR - YATES,JF SO RISK ANALYSIS LA English DT Book Review RP WHITE, RK (reprint author), OAK RIDGE NATL LAB,DIV HLTH SCI RES,OAK RIDGE,TN 37831, USA. NR 1 TC 1 Z9 1 U1 2 U2 6 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD OCT PY 1994 VL 14 IS 5 BP 871 EP 871 PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA PT370 UT WOS:A1994PT37000027 ER PT J AU PEEBLES, PJE SCHRAMM, DN TURNER, EL KRON, RG AF PEEBLES, PJE SCHRAMM, DN TURNER, EL KRON, RG TI THE EVOLUTION OF THE UNIVERSE SO SCIENTIFIC AMERICAN LA English DT Article C1 UNIV CHICAGO,DEPT PHYS SCI,CHICAGO,IL. SPACE TELESCOPE SCI INST,BALTIMORE,MD. DEPT ASTRON & ASTROPHYS CHICAGO,CHICAGO,IL. FERMILAB NATL ACCELERATOR LAB,EXPTL ASTROPHYS GRP,BATAVIA,IL. RP PEEBLES, PJE (reprint author), PRINCETON UNIV,PRINCETON,NJ 08544, USA. RI Turner, Edwin/A-4295-2011 NR 4 TC 1 Z9 1 U1 0 U2 3 PU SCI AMERICAN INC PI NEW YORK PA 415 MADISON AVE, NEW YORK, NY 10017 SN 0036-8733 J9 SCI AM JI Sci.Am. PD OCT PY 1994 VL 271 IS 4 BP 53 EP 57 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PH269 UT WOS:A1994PH26900015 ER PT J AU RITTNER, MN EASTMAN, JA WEERTMAN, JR AF RITTNER, MN EASTMAN, JA WEERTMAN, JR TI SYNTHESIS AND PROPERTIES STUDIES OF NANOCRYSTALLINE AL-AL3ZR SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID NANOMETER-SIZED CRYSTALS; GRAIN-GROWTH; AL-ZR; ALLOYS; NICKEL; TEM C1 ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. RP NORTHWESTERN UNIV, DEPT MAT SCI & ENGN, EVANSTON, IL 60208 USA. RI Weertman, Julia/B-7540-2009; Eastman, Jeffrey/E-4380-2011 NR 23 TC 11 Z9 11 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD OCT 1 PY 1994 VL 31 IS 7 BP 841 EP 846 DI 10.1016/0956-716X(94)90489-8 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NY164 UT WOS:A1994NY16400010 ER PT J AU BOTTER, R ASTE, T BERUTO, D AF BOTTER, R ASTE, T BERUTO, D TI INFLUENCE OF MICROSTRUCTURES ON THE FUNCTIONAL-PROPERTIES OF TIN OXIDE-BASED GAS SENSORS SO SENSORS AND ACTUATORS B-CHEMICAL LA English DT Article DE MICROSTRUCTURES; TIN OXIDE GAS SENSORS ID REGULAR NETWORKS; THIN-FILMS; SNO2; PERCOLATION; CONDUCTION; ADDITIVES; SURFACE; ODOR; NO AB Three types of SnO2 sintered-pellet gas sensors with different relative densities ranging between 0.5 and 0.3 and with almost equal grain and neck sizes have been prepared and tested. The influence of such microstructures on the functional properties of SnO2 gas sensors has been investigated using dry air and 1000 ppm ethanol in air, over the temperature range 600-700 K. Experimental data are discussed in the light of existing theories. Different equations for the sensitivity have been rewritten and discussed in order to separate the contribution of the microstructure from other contributions. The equations allow one to understand the sensitivity behaviour versus temperature and applied external electrical field. Furthermore, such equations predict the effects of the average coordination number on the electrical sensitivity of the three families of sensors, in significant agreement with the experimental data. C1 UNIV GENOA,FAC ENGN,INST CHEM,I-16129 GENOA,ITALY. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP BOTTER, R (reprint author), UNIV GENOA,INTERDEPT CTR MAT ENGN,PIAZZALE JF KENNEDY,PAD D,I-16129 GENOA,ITALY. RI Aste, Tomaso /E-9961-2010 OI Aste, Tomaso /0000-0002-4219-0215 NR 29 TC 20 Z9 21 U1 1 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-4005 J9 SENSOR ACTUAT B-CHEM JI Sens. Actuator B-Chem. PD OCT PY 1994 VL 22 IS 1 BP 27 EP 35 DI 10.1016/0925-4005(94)01257-1 PG 9 WC Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation SC Chemistry; Electrochemistry; Instruments & Instrumentation GA PU459 UT WOS:A1994PU45900004 ER PT J AU PFEIFER, KB SPRUNG, JL GALLOWAY, TR AF PFEIFER, KB SPRUNG, JL GALLOWAY, TR TI POLYMER-COATED SURFACE-ACOUSTIC-WAVE MONITORING OF CCL4 IN A STEAM REFORMING REACTOR SO SENSORS AND ACTUATORS B-CHEMICAL LA English DT Article DE CARBON TETRACHLORIDE MONITORING; STEAM REFORMING REACTOR; SURFACE ACOUSTIC WAVE SENSOR ID FILMS AB A surface acoustic wave (SAW)-based sensor system has been developed, which will sense organic vapors in harsh chemical and physical environments (HCl and steam) by absorbing vapors into a polyisobutylene (PIB) film. The sensor system has been demonstrated on a small-scale steam reforming system during decomposition testing of CCl4, and has st detection limit on the order of 300 ppm, while displaying no visible degradation due to the HCl. The sensor response has been compared to the experimental isotherm developed by Brunauer, Emmett, and Teller (BET) for CCl4 in an atmosphere of CO2 and steam, and the binding energy of the first monolayer of CCl4 onto the film is found to be on the order of 9.6 kcal mol(-1). The sensor system has been tested during industrial-scale waste decomposition in the Synthetica Moving Bed Evaporator (MBEv, Synthetica Technologies, Richmond, CA), and has verified that the MBEv equipment can decompose on the order of 90% of an input CCl4 stream upon vaporization at 300 degrees C. C1 SYNTHET TECHNOL INC,RICHMOND,CA 94804. RP PFEIFER, KB (reprint author), SANDIA NATL LABS,SANDIA MICROSENSOR RES & DEV DEPT,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 11 TC 2 Z9 2 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-4005 J9 SENSOR ACTUAT B-CHEM JI Sens. Actuator B-Chem. PD OCT PY 1994 VL 22 IS 1 BP 37 EP 45 DI 10.1016/0925-4005(94)01255-5 PG 9 WC Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation SC Chemistry; Electrochemistry; Instruments & Instrumentation GA PU459 UT WOS:A1994PU45900005 ER PT J AU WATSON, J AF WATSON, J TI CONTINUOUS, FREE-FLOW ELECTROPHORESIS - A MODIFIED APPROACH SO SEPARATIONS TECHNOLOGY LA English DT Article DE ELECTROPHORESIS; CONTINUOUS; PREPARATIVE; FREE-FLOW AB Electrophoresis is an exceptionally effective method for separating small particles or large molecules in the colloidal size range, and is widely used in biological and clinical studies to separate cells, viruses, and large proteins. It has become the standard analytical tool for detecting the presence of these materials. Despite the success of electrophoresis in analytical and research applications, there has been much less success in using electrophoresis in preparative-scale applications to separate large quantities of materials. A new or modified concept is described that eliminates some of the most serious problems that have arisen in adopting electrophoresis for preparative-scale separations. The new concept uses a narrow-gap flow system between the electrodes and eliminates or greatly reduces problems with thermal convection. In addition, the narrow gap can be a convenient annular region between two cylindrical electrodes. The electric potential is applied across the annulus (or across the narrow flow channel) and the potential applied to the electrodes is reversed periodically. Between the reversals of the electric field, the inner electrode (or one side of the narrow flow gap) is rotated periodically in different directions. This periodic motion and alternating of the applied field displaces charged particles in the angular direction. The rate of displacement depends on the electrophoretic mobility of the particles. RP WATSON, J (reprint author), OAK RIDGE NATL LAB,DIV CHEM TECHNOL,POB 2008,OAK RIDGE,TN 37831, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN PI WOBURN PA 225 WILDWOOD AVE #UNITB PO BOX 4500, WOBURN, MA 01801-2084 SN 0956-9618 J9 SEPAR TECHNOL JI Sep. Technol. PD OCT PY 1994 VL 4 IS 4 BP 239 EP 243 DI 10.1016/0956-9618(94)80027-8 PG 5 WC Chemistry, Analytical; Engineering, Chemical SC Chemistry; Engineering GA PJ986 UT WOS:A1994PJ98600004 ER PT J AU GILBERT, JR NG, EG PEYTON, BW AF GILBERT, JR NG, EG PEYTON, BW TI AN EFFICIENT ALGORITHM TO COMPUTE ROW AND COLUMN COUNTS FOR SPARSE CHOLESKY FACTORIZATION SO SIAM JOURNAL ON MATRIX ANALYSIS AND APPLICATIONS LA English DT Article DE SPARSE CHOLESKY FACTORIZATION; SPARSE QR FACTORIZATION; SYMBOLIC FACTORIZATION; GRAPH ALGORITHMS; CHORDAL GRAPH COMPLETION; DISJOINT SET UNION; COLUMN COUNTS; ROW COUNTS ID ELIMINATION TREES; SET UNION AB Let an undirected graph G be given, along with a specified depth-first spanning tree T. Almost-linear-time algorithms are given to solve the following two problems. First, for every vertex v, compute the number of descendants w of v for which some descendant of w is adjacent (in G) to v. Second, for every vertex v, compute the number of ancestors of v that are adjacent (in G) to at least one descendant of v. These problems arise in Cholesky and QR factorizations of sparse matrices. The authors' algorithms can be used to determine the number of nonzero entries in each row and column of the triangular factor of a matrix from the zero/nonzero structure of the matrix. Such a prediction makes storage allocation for sparse matrix factorizations more efficient. The authors' algorithms run in time linear in the size of the input times a slowly growing inverse of Ackermann's function. The best previously known algorithms for these problems ran in time linear in the sum of the nonzero counts, which is usually much larger. Experimental results are given demonstrating the practical efficiency of the new algorithms. C1 OAK RIDGE NATL LAB,MATH SCI SECT,OAK RIDGE,TN 37831. RP GILBERT, JR (reprint author), XEROX CORP,PALO ALTO RES CTR,3333 COYOTE HILL RD,PALO ALTO,CA 94304, USA. NR 29 TC 25 Z9 25 U1 0 U2 1 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0895-4798 J9 SIAM J MATRIX ANAL A JI SIAM J. Matrix Anal. Appl. PD OCT PY 1994 VL 15 IS 4 BP 1075 EP 1091 DI 10.1137/S0895479892236921 PG 17 WC Mathematics, Applied SC Mathematics GA PJ976 UT WOS:A1994PJ97600003 ER PT J AU GU, M EISENSTAT, SC AF GU, M EISENSTAT, SC TI A STABLE AND EFFICIENT ALGORITHM FOR THE RANK-ONE MODIFICATION OF THE SYMMETRICAL EIGENPROBLEM SO SIAM JOURNAL ON MATRIX ANALYSIS AND APPLICATIONS LA English DT Article DE SYMMETRICAL EIGENPROBLEM; RANK-ONE MODIFICATION ID EIGENVALUE PROBLEM; DECOMPOSITION; EIGENVECTORS; MATRICES AB An algorithm is presented for computing the eigendecomposition of a symmetric rank-one modification of a symmetric matrix whose eigendecomposition is known. Previous algorithms for this problem suffer a potential loss of orthogonality among the computed eigenvectors, unless extended precision arithmetic is used. This algorithm is based on a novel, stable method for computing the eigenvectors. It does not require extended precision and is as efficient as previous approaches. C1 YALE UNIV,DEPT COMP SCI,NEW HAVEN,CT 06520. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP GU, M (reprint author), UNIV CALIF BERKELEY,DEPT MATH,BERKELEY,CA 94720, USA. RI Gu, Min/B-6627-2008 NR 28 TC 66 Z9 66 U1 0 U2 4 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0895-4798 J9 SIAM J MATRIX ANAL A JI SIAM J. Matrix Anal. Appl. PD OCT PY 1994 VL 15 IS 4 BP 1266 EP 1276 DI 10.1137/S089547989223924X PG 11 WC Mathematics, Applied SC Mathematics GA PJ976 UT WOS:A1994PJ97600014 ER PT J AU CHEMLA, DS AF CHEMLA, DS TI COHERENT ULTRAFAST NONLINEAR-OPTICAL PROCESSES IN SEMICONDUCTOR QUANTUM-WELLS SO SOLID STATE COMMUNICATIONS LA English DT Article DE A QUANTUM WELLS; E NONLINEAR OPTICS; TIME-RESOLVED OPTICAL SPECTROSCOPIES ID NONCANONICAL-TRANSFORMATION APPROACH; FREE-INDUCTION DECAY; FERMI SEA; PHOTON-ECHOES; LIGHT-PULSES; GAAS; SINGULARITIES; SPECTRA; CARRIER; RELAXATION AB This article reviews recent experiments where, for the first time, the dynamics of both the amplitude and the phase of ultrafast coherent emission from semiconductor quantum well structures have been investigated. RP CHEMLA, DS (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,DEPT PHYS,BERKELEY,CA 94720, USA. NR 36 TC 6 Z9 6 U1 1 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD OCT PY 1994 VL 92 IS 1-2 BP 37 EP 43 DI 10.1016/0038-1098(94)90856-7 PG 7 WC Physics, Condensed Matter SC Physics GA PH057 UT WOS:A1994PH05700007 ER PT J AU COHEN, ML AF COHEN, ML TI PREDICTING PROPERTIES AND NEW MATERIALS SO SOLID STATE COMMUNICATIONS LA English DT Article DE D ELECTRONIC BAND STRUCTURE; CRYSTAL BINDING AND EQUATION OF STATE ID SUPERCONDUCTIVITY; SOLIDS; DENSITY; NITRIDE; CARBON; C-60; SI AB The development and application of a ''Standard Model'' of solids are described with emphases on the capacity of the model for predicting solid state properties and the existence of new materials. RP UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV MAT SCI, DEPT PHYS, BERKELEY, CA 94720 USA. NR 44 TC 67 Z9 67 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0038-1098 EI 1879-2766 J9 SOLID STATE COMMUN JI Solid State Commun. PD OCT PY 1994 VL 92 IS 1-2 BP 45 EP 52 DI 10.1016/0038-1098(94)90857-5 PG 8 WC Physics, Condensed Matter SC Physics GA PH057 UT WOS:A1994PH05700008 ER PT J AU KOPP, RA AF KOPP, RA TI WORKING GROUP-3 - CORONAL STREAMERS SO SPACE SCIENCE REVIEWS LA English DT Review DE SUN, CORONA; SUN, STREAMERS; SUN, SOLAR WIND AB The working group on coronal streamers convened on the first day of the 2nd SOHO Workshop, which took place in Marciana Marina, Isola d'Elba, 27 September - 1 October 1993. Recent progress in streamer observational techniques and theoretical modeling was reported. The contribution of streamers to the mass and energy supply for the solar wind was discussed. Moreover, the importance of thin electric current sheets for determining both the gross dynamical properties of streamers and the fine-scale filamentary structure within streamers, was strongly emphasized. Potential advances to our understanding of these areas of coronal physics that could be made by the contingent of instruments aboard SOHO were pointed out. RP LOS ALAMOS NATL LAB, MS F645, LOS ALAMOS, NM 87545 USA. NR 8 TC 6 Z9 6 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0038-6308 EI 1572-9672 J9 SPACE SCI REV JI Space Sci. Rev. PD OCT PY 1994 VL 70 IS 1-2 BP 309 EP 316 DI 10.1007/BF00777886 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PN956 UT WOS:A1994PN95600054 ER PT J AU VODINH, T AF VODINH, T TI WINEFORDNER AND MOLECULAR-SPECTROSCOPY - THE MAN AND HIS LEGACY SO SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY LA English DT Item About an Individual RP VODINH, T (reprint author), OAK RIDGE NATL LAB,DIV HLTH SCI RES,ADV MONITORING DEV GRP,OAK RIDGE,TN 37831, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0584-8547 J9 SPECTROCHIM ACTA B JI Spectroc. Acta Pt. B-Atom. Spectr. PD OCT-DEC PY 1994 VL 49 IS 12-14 BP 1225 EP 1227 DI 10.1016/0584-8547(94)80105-3 PG 3 WC Spectroscopy SC Spectroscopy GA QD364 UT WOS:A1994QD36400008 ER PT J AU NIU, HS HOUK, RS AF NIU, HS HOUK, RS TI LANGMUIR PROBE MEASUREMENTS OF THE ION EXTRACTION PROCESS IN INDUCTIVELY-COUPLED PLASMA-MASS SPECTROMETRY .1. SPATIALLY-RESOLVED DETERMINATION OF ELECTRON-DENSITY AND ELECTRON-TEMPERATURE SO SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY LA English DT Article ID ATOMIC EMISSION-SPECTROMETRY; KINETIC ENERGIES; NUMBER DENSITIES; SAMPLING PROCESS; PRESSURE PLASMA; ICP-MS; SKIMMER; GAS; IONIZATION; INTERFACE AB A single Langmuir probe is inserted through the skimmer into the supersonic jet extracted from an inductively coupled plasma (ICP). Electron temperature (T-e) and electron density (n(e)) are measured with axial spatial resolution from 2 mm behind the sampler to 40 mm behind the skimmer. In the upstream part of the supersonic jet n, drops as axial position increases, as expected for a quasineutral beam. However, the measurements indicate the presence of an unexpected disturbance in front of the skimmer. Electron density behind the skimmer is much lower than would be expected if the skimmer behaved ideally. Plasma conditions that yield a high plasma potential and secondary discharge lead to further reductions in n(e) behind the skimmer. The electrons stay hot during the extraction process, as seen previously, although T-e does drop by similar to 4000 K behind the skimmer. The measurements generally support the concept that the extracted plasma remains quasineutral as it passes through the sampler and skimmer. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,US DOE,AMES LAB,AMES,IA 50011. NR 58 TC 28 Z9 28 U1 0 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0584-8547 J9 SPECTROCHIM ACTA B JI Spectroc. Acta Pt. B-Atom. Spectr. PD OCT-DEC PY 1994 VL 49 IS 12-14 BP 1283 EP 1303 DI 10.1016/0584-8547(94)80109-6 PG 21 WC Spectroscopy SC Spectroscopy GA QD364 UT WOS:A1994QD36400012 ER PT J AU RAEKER, TJ DEPRISTO, AE AF RAEKER, TJ DEPRISTO, AE TI MOLECULAR-DYNAMICS AND KINETIC MONTE-CARLO SIMULATIONS OF FE ISLAND GROWTH ON CU(111) SO SURFACE SCIENCE LA English DT Article ID CORRECTED EFFECTIVE-MEDIUM; THIN-FILM GROWTH; EPITAXIAL-GROWTH; ULTRATHIN FILMS; RATE-EQUATION; FERROMAGNETIC ORDER; BCC TRANSFORMATION; ONE MONOLAYER; BEAM EPITAXY; IRON FILMS AB We have performed extensive molecular dynamics (MD) simulations of a 0.07 ML coverage of Fe adatoms on Cu(111) at 300 K using a many-body interaction potential from the molecular dynamics/Monte-Carlo corrected effective medium theory. The Fe atoms were deposited randomly and then followed for two hundred picoseconds (ps) while annealing at a temperature of 300 K. The results of these MD simulations were analyzed to understand the general features of island growth. One finding was that islands as large as four atoms are only one of magnitude less mobile than monomers. Thus, the mobility of small islands played a significant role in the growth of large islands. In addition, the presence of next-nearest neighbor attractions was found to increase the speed of this growth. Another finding was that the Fe islands obtained their equilibrium structures only very slowly compared to the times of aggregation or coalescence. The MD results were used to construct and test several kinetic Monte Carlo models that incorporated the newly identified processes. Considering these MC models, we discuss some details of island structure, stability and aggregation. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 65 TC 16 Z9 16 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 OCT 1 PY 1994 VL 317 IS 3 BP 283 EP 294 DI 10.1016/0039-6028(94)90284-4 PG 12 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA PJ604 UT WOS:A1994PJ60400007 ER PT J AU OVERBURY, SH VANDENOETELAAR, RJA MULLINS, DR AF OVERBURY, SH VANDENOETELAAR, RJA MULLINS, DR TI SULFIDATION OF W(001) STUDIED BY LOW-ENERGY ION-SCATTERING SO SURFACE SCIENCE LA English DT Article ID INDUCED RECONSTRUCTION; MO(001) SURFACE AB Low-energy alkali Li+ ion scattering, low-energy diffraction and Auger electron spectroscopy were used to study the structure of sulfided W(001). The c(2 x 2)-S/W(001) structure, found at coverages less than 0.5 ML, is determined to be an ordered overlayer of S atoms bounded in undistorted four-fold hollows with perpendicular height of 0.102 nm. The maximum second-layer rippling is less than 0.002 nm and the S overlayer relaxes the first-second W interlayer spacing to the bulk value to within 0.004 nm. For coverages exceeding that of the c(2 x 2)-S/W(001), W lattice vacancies are induced at the surface by annealing at and above 900 K. The number of vacancies increases with coverage reaching 0.2 ML at S saturation. The saturation structure, characterized by a p(square-root 5 x square-root 5)R26.5-degrees-S/W(001) LEED pattern is associated with 0.8 ML of S located atop second-layer W atoms. No evidence is found for S adsorbed in deep-hollow sites resulting from W vacancies. The results are compared to previous LEED, SXPS, work function and X-ray diffraction results from W(001) and Mo(001) surfaces. RP OAK RIDGE NATL LAB, POB 2008, OAK RIDGE, TN 37831 USA. RI Overbury, Steven/C-5108-2016 OI Overbury, Steven/0000-0002-5137-3961 NR 22 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 EI 1879-2758 J9 SURF SCI JI Surf. Sci. PD OCT 1 PY 1994 VL 317 IS 3 BP 341 EP 352 DI 10.1016/0039-6028(94)90289-5 PG 12 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA PJ604 UT WOS:A1994PJ60400012 ER PT J AU HAMZA, AV BALOOCH, M MOALEM, M AF HAMZA, AV BALOOCH, M MOALEM, M TI GROWTH OF SILICON-CARBIDE FILMS VIA C-60 PRECURSORS SO SURFACE SCIENCE LA English DT Letter ID C-60; ADSORPTION; SURFACE AB Epitaxial silicon carbide films are grown on Si(100) and Si(111) substrates at surface temperatures between 950 and 1250 K via C60 precursors. Films have been grown up to thicknesses greater than 1 mum. The growth rate of the SiC film is not limited by the surface reaction rate of C60 with silicon at these temperatures, rather by the arrival rate of the reactants Si (by diffusion) or C60. This results in rapid film growth. Films have been characterized by low energy electron diffraction, X-ray diffraction, and Auger depth profiling. X-ray diffraction suggests the growth of beta-SiC in the temperature range investigated. Auger depth profiling shows the film is stoichiometric. Selective crystalline silicon carbide growth is achieved on patterned silicon-silicon oxide samples. C1 UNIV CALIF BERKELEY,DEPT NUCL ENGN,BERKELEY,CA 94720. RP HAMZA, AV (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550, USA. NR 11 TC 88 Z9 88 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD OCT 1 PY 1994 VL 317 IS 3 BP L1129 EP L1135 PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA PJ604 UT WOS:A1994PJ60400002 ER PT J AU HIRSCHMUGL, CJ WILLIAMS, GP PERSSON, BNJ VOLOKITIN, AI AF HIRSCHMUGL, CJ WILLIAMS, GP PERSSON, BNJ VOLOKITIN, AI TI ADSORBATE VIBRATIONAL DYNAMICS IN THE ANOMALOUS SKIN-EFFECT FREQUENCY REGION SO SURFACE SCIENCE LA English DT Letter ID SURFACE RESISTIVITY; CU(100); CO; LAYERS AB It is shown that in surface infrared reflectance at low frequencies, dipole forbidden parallel adsorbate vibrations give rise to anti-absorption resonances, whose asymmetry is independent of the nature of the adsorbate-substrate bond. The theory is compared with new absolute IR measurements for CO/Cu(100) and (111) over the frequency range 180-2500 cm-1 at high resolution (1 cm-1). The linewidth of the CO frustrated rotation is dominated by energy relaxation via electron-hole pair exitations. The deduced lifetimes (approximately 1 ps) are in good agreement with theory. C1 BROOKHAVEN NATL LAB, NATL SYNCHROTRON LIGHT SOURCE, UPTON, NY 11973 USA. FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST FESTKORPERFORSCH, D-52425 JULICH, GERMANY. YALE UNIV, DEPT APPL PHYS, NEW HAVEN, CT 06520 USA. RI Persson, Bo Nils Johan/I-1548-2013 OI Persson, Bo Nils Johan/0000-0003-1535-738X NR 25 TC 32 Z9 32 U1 0 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD OCT 1 PY 1994 VL 317 IS 3 BP L1141 EP L1146 PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA PJ604 UT WOS:A1994PJ60400004 ER PT J AU PERKINS, LS DEPRISTO, AE AF PERKINS, LS DEPRISTO, AE TI SELF-DIFFUSION OF ADATOMS ON FCC(110) SURFACES SO SURFACE SCIENCE LA English DT Letter ID CORRECTED EFFECTIVE-MEDIUM; IR(110) SURFACES; ATOMIC-EXCHANGE; SINGLE ADATOMS; REACTION-PATH; NI; MECHANISMS; RELAXATION; CLUSTERS; NI(110) AB We investigate the mechanisms and associated energies of diffusion for the Ni/Ni(110), Cu/Cu(110), Pd/Pd(110) and Ag/Ag(110) systems using the corrected effective medium (CEM) method. On the (110) surface, cross-channel diffusion can occur via atomic exchange of the adsorbate atom with an atom of the channel wall or by hopping over the short-bridge site located in the channel wall. We find that the barrier for cross-channel diffusion is much smaller for the atomic exchange path. In-channel diffusion occurs via hopping over the long-bridge site. We find that the activation barrier associated with in-channel diffusion is smaller than the activation barrier associated with cross-channel diffusion by 0.17, 0.01, 0.03 and 0.08 eV for Ni, Cu, Pd and Ag, respectively. We also investigate convergence of the activation barriers by varying the number of active atoms in the simulations. Decreases of 0.3-0.6 eV are found as the number of active atoms is increased from nearest neighbors to a (converged) large number of active atoms; this is due to relaxation of the strain. The decreases are nearly identical for the in-channel and cross-channel mechanisms. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 25 TC 41 Z9 41 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD OCT 1 PY 1994 VL 317 IS 3 BP L1152 EP L1156 PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA PJ604 UT WOS:A1994PJ60400006 ER PT J AU FOWLER, JS VOLKOW, ND LOGAN, J WANG, GJ MACGREGOR, RR SCHLYER, D WOLF, AP PAPPAS, N ALEXOFF, D SHEA, C DORFLINGER, E KRUCHOWY, L YOO, K FAZZINI, E PATLAK, C AF FOWLER, JS VOLKOW, ND LOGAN, J WANG, GJ MACGREGOR, RR SCHLYER, D WOLF, AP PAPPAS, N ALEXOFF, D SHEA, C DORFLINGER, E KRUCHOWY, L YOO, K FAZZINI, E PATLAK, C TI SLOW RECOVERY OF HUMAN BRAIN MAO-B AFTER L-DEPRENYL (SELEGELINE) WITHDRAWAL SO SYNAPSE LA English DT Article DE L-DEPRENYL; SELEGELINE; MAO B; PET; PARKINSONS DISEASE ID MONOAMINE OXIDASE-B; SUPEROXIDE-DISMUTASE ACTIVITIES; POSITRON EMISSION TOMOGRAPHY; FISCHER 344 RATS; PARKINSONS-DISEASE; ALZHEIMERS-DISEASE; LIFE-SPAN; DOPAMINE; (-)DEPRENYL; SELEGILINE AB L-Deprenyl (Selegeline) is an enzyme-activated irreversible inhibitor of monoamine oxidase B (MAO B; EC 1.4.3.4). It is used to treat Parkinson's disease at a dose of 5 mg twice a day. Since enzyme inhibition is irreversible, the recovery of functional enzyme activity after withdrawal from L-deprenyl requires the synthesis of new enzyme. We have measured a 40 day half-time for brain MAO B synthesis in Parkinson's disease and in normal subjects after withdrawal from L-deprenyl. This is the first measurement of the synthesis rate of a specific protein in the living human brain. L-Deprenyl is currently used by 50,000 patients with Parkinson's disease in the United States and its use is expected to increase with reports that it may be beneficial in Alzheimer's disease. The slow turnover of brain MAO B suggests that the current clinical dose of L-deprenyl may be excessive and that the clinical efficacy of reduced dosing should be evaluated. Such an evaluation may have mechanistic importance as well as an impact on reducing the side effects and the costs arising from excessive drug use. (C) 1994 Wiley-Liss, Inc. C1 BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. HOFFMANN LA ROCHE INC,NUTLEY,NJ 07110. NYU,NEW YORK,NY 10016. SUNY STONY BROOK,DEPT SURG,STONY BROOK,NY 11794. RP FOWLER, JS (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. FU NINDS NIH HHS [NS 15638] NR 51 TC 113 Z9 114 U1 0 U2 6 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-4476 J9 SYNAPSE JI Synapse PD OCT PY 1994 VL 18 IS 2 BP 86 EP 93 DI 10.1002/syn.890180203 PG 8 WC Neurosciences SC Neurosciences & Neurology GA PJ747 UT WOS:A1994PJ74700002 PM 7839316 ER PT J AU DING, YS FOWLER, JS VOLKOW, ND GATLEY, SJ LOGAN, J DEWEY, SL ALEXOFF, D FAZZINI, E WOLF, AP AF DING, YS FOWLER, JS VOLKOW, ND GATLEY, SJ LOGAN, J DEWEY, SL ALEXOFF, D FAZZINI, E WOLF, AP TI PHARMACOKINETICS AND IN-VIVO SPECIFICITY OF [C-11] DL-THREO-METHYLPHENIDATE FOR THE PRESYNAPTIC DOPAMINERGIC NEURON SO SYNAPSE LA English DT Article DE DOPAMINE TRANSPORTER; NEURODEGENERATION; RADIOTRACER ID POSITRON EMISSION TOMOGRAPHY; DL-THREO-METHYLPHENIDATE; COCAINE BINDING-SITES; PARKINSONS-DISEASE; REUPTAKE SITES; ENANTIOSELECTIVE PHARMACOKINETICS; PHARMACOLOGICAL CHARACTERIZATION; SEROTONIN TRANSPORTERS; UPTAKE INHIBITOR; CAUDATE-NUCLEUS AB dl-threo-Methylphenidate (Ritalin) was labeled with carbon-11 (t(1/2):20.4 minutes) in order to measure its pharmacokinetics, to evaluate it as a radiotracer for the presynaptic dopaminergic neuron, and to examine its sensitivity to the loss of dopaminergic neurons. Positron emission tomographic (PET) studies were carried out in the baboon to determine specificity for the presynaptic dopaminergic neuron and in humans to assess sensitivity to neuronal loss. Studies with [C-11]dl-threo-methylphenidate ([C-11]MP) in baboon demonstrated high regional uptake in the striatum. Peak uptake (0.04%/cc) occurred at 5-15 minutes post-injection. The half-time for clearance from peak uptake for [C-11]MP was 60 minutes and the ratio between the radioactivity in the striatum and that in the cerebellum (ST/CB) ranged from 2.2 to 2.6 at 40 minutes. Repeated measures in the same baboon showed less than or equal to 8% variability in the ST/CB ratio. Pretreatment with unlabeled methylphenidate (0.5 mg/kg) or GBR12909 (1.5 mg/kg) 30 minutes prior to [C-11]MP injection markedly reduced the striatal but not the cerebellar uptake of[C-11]MP, demonstrating the saturable and specific binding of [C-11]MP to a site on the dopamine transporter in the brain. In both cases, the ratio of striatum to cerebellum (ST/CB) after pretreatment was reduced by about 43%. The ratios of distribution volumes at the steady-state for the striatum to cerebellum (ST/CB) for these two separate studies in the same baboon were reduced by 37 and 38%, respectively. In contrast, pretreatment with tomoxetine (1.5 mg/kg) or citalopram (2.0 mg/kg), inhibitors of the norepinephrine and serotonin transporter, respectively, did not produce a significant change in the kinetics of [C-11]MP and the ST/CB after pretreatment was similar to that for control. In one patient with Parkinson's disease, the striatum to cerebellum ratio of [C-11]MP was markedly lower than that of an elderly normal subject. These results demonstrate the saturable [C-11]MP binding to the dopamine transporter in the baboon brain and that [C-11]MP is sensitive to dopamine neuron degeneration in Parkinson's disease. (C) 1994 Wiley-Liss, Inc. C1 NYU,MED CTR,NEW YORK,NY 10016. RP DING, YS (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. FU NIDA NIH HHS [DA-06278]; NINDS NIH HHS [NS-15380, NS-15638] NR 46 TC 60 Z9 60 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 0887-4476 J9 SYNAPSE JI Synapse PD OCT PY 1994 VL 18 IS 2 BP 152 EP 160 DI 10.1002/syn.890180207 PG 9 WC Neurosciences SC Neurosciences & Neurology GA PJ747 UT WOS:A1994PJ74700006 PM 7839313 ER PT J AU HACKER, BC AF HACKER, BC TI MILITARY INSTITUTIONS, WEAPONS, AND SOCIAL-CHANGE - TOWARD A NEW HISTORY OF MILITARY TECHNOLOGY SO TECHNOLOGY AND CULTURE LA English DT Article; Proceedings Paper CT 1991 SHOT Meeting CY 1991 CL MADISON, WI SP SOC HIST TECHNOL ID WARFARE; WAR; DEFENSE; SCIENCE; STATE; ORGANIZATION; EVOLUTION; ARMY; UNIVERSITIES; STRATEGY RP HACKER, BC (reprint author), LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 1395 TC 12 Z9 12 U1 2 U2 7 PU JOHNS HOPKINS UNIV PRESS PI BALTIMORE PA JOURNALS PUBLISHING DIVISION, 2715 NORTH CHARLES ST, BALTIMORE, MD 21218-4363 USA SN 0040-165X J9 TECHNOL CULT JI Technol. Cult. PD OCT PY 1994 VL 35 IS 4 BP 768 EP 834 DI 10.2307/3106506 PG 67 WC History & Philosophy Of Science SC History & Philosophy of Science GA QH652 UT WOS:A1994QH65200005 ER PT J AU MURAL, RJ AF MURAL, RJ TI FINDING ONES WAY THROUGH DNA SO TRENDS IN BIOTECHNOLOGY LA English DT Editorial Material RP MURAL, RJ (reprint author), OAK RIDGE NATL LAB,DIV BIOL,POB 2009,OAK RIDGE,TN 37831, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0167-7799 J9 TRENDS BIOTECHNOL JI Trends Biotechnol. PD OCT PY 1994 VL 12 IS 10 BP 393 EP 394 DI 10.1016/0167-7799(94)90025-6 PG 2 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA PK718 UT WOS:A1994PK71800003 PM 7765383 ER PT J AU BLAU, PJ AF BLAU, PJ TI FRICTION PROCESS DIAGRAMS FOR ANALYZING INTERFACIALLY-COMPLEX SLIDING CONTACTS SO TRIBOLOGY TRANSACTIONS LA English DT Article DE FRICTION MECHANISMS; UNLUBRICATED FRICTION; UNLUBRICATED WEAR; CERAMICS; COPPER; ALUMINUM ID BREAK-IN CURVES AB Kinetic friction force varies with time in many sliding systems. In some poorly-lubricated tribosystems, or unlubricated systems in which significant interfacial adhesion occurs, this variation can be as large as the nominal value of the friction force itself. Time-varying friction arises from changing combinations of interfacial processes. The changing contribution of frictional processes in complex sliding interfaces can be represented using graphical constructions called friction process diagrams (FPDs). Using FPDs, the frictional changes within a tribosystem are analyzed on the process level, without the need to know exactly how detailed mechanisms, such as deformation, fracture, diffusion, defect generation, and tribochemical reactions, interact within each process. Binary and ternary forms of PFDs are used to explain the causes of frictional behavior observed in studies of metallic and ceramic sliding. Extensions of FPDs to more complex cases, for example involving elevated temperatures, are also discussed. RP BLAU, PJ (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 18 TC 1 Z9 1 U1 0 U2 0 PU SOC TRIBOLOGISTS & LUBRICATION ENGINEERS PI PARK RIDGE PA 838 BUSSE HIGHWAY, PARK RIDGE, IL 60068 SN 0569-8197 J9 TRIBOL T JI Tribol. Trans. PD OCT PY 1994 VL 37 IS 4 BP 751 EP 756 DI 10.1080/10402009408983355 PG 6 WC Engineering, Mechanical SC Engineering GA PN115 UT WOS:A1994PN11500010 ER PT J AU TRETTIN, CC AUST, WM DAVIS, MM WEAKLEY, AS WISNIEWSKI, J AF TRETTIN, CC AUST, WM DAVIS, MM WEAKLEY, AS WISNIEWSKI, J TI WETLANDS OF THE INTERIOR SOUTHEASTERN UNITED-STATES - CONFERENCE SUMMARY STATEMENT SO WATER AIR AND SOIL POLLUTION LA English DT Editorial Material AB The wetland resources in the southern United States are diverse, being characterized by bottomland hardwoods, forested riparian zones, swamps, marshes, bogs, and fens. Recognizing the importance of the wetland resource, the need to develop information on the diversity of wetland types, and the evolving public debate regarding the protection and management of wetlands, this conference was organized to (1) provide a forum for the presentation and discussion of current research and information on wetland ecosystems, (2) to develop a basis on which to improve wetland conservation and management, (3) to provide a forum to encourage collaboration in the study and management of wetland resources, and (4) to suggest actions that would benefit wetland conservation and management. Twenty-three invited technical papers and three working group sessions addressed topics encompassing the full spectrum of wetland issues, including resource status, ecological and hydrological processes, management and conservation, and restoration and creation. Major findings discussed at the conference included the need to distinguish between functions and values, the development of a hydrogeomorphic classification system for assessing wetland functions, and assessment methodologies for planning and implementing effective wetland restoration projects. Papers summarizing the current understanding of wetland soil and vegetation processes in the region highlighted the important role wetlands play in landscape function, yet the understanding of those processes is incomplete. Insights developed from the study of wetlands in the interior southeastern United States have widespread applicability to other regions because of similarities in hydrogeomorphic setting and vegetation communities, and the management and conservation issues. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. VIRGINIA POLYTECH INST & STATE UNIV,DEPT FORESTRY,BLACKSBURG,VA 24061. USA,CORPS ENGINEERS,DIV ECOL RES,WATERWAYS EXPT STN,VICKSBURG,MS 39180. N CAROLINA NAT HERITAGE PROGRAM,RALEIGH,NC 27611. WISNIEWSKI & ASSOCIATES INC,FALLS CHURCH,VA 22043. NR 15 TC 3 Z9 3 U1 3 U2 5 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD OCT PY 1994 VL 77 IS 3-4 BP 199 EP 205 DI 10.1007/BF00478418 PG 7 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA QD818 UT WOS:A1994QD81800003 ER PT J AU PEARSON, SM AF PEARSON, SM TI LANDSCAPE-LEVEL PROCESSES AND WETLAND CONSERVATION IN THE SOUTHERN APPALACHIAN MOUNTAINS SO WATER AIR AND SOIL POLLUTION LA English DT Article; Proceedings Paper CT Southern-Appalachian-Man-and-the-Biosphere (SAMAB) Conference on Wetland Ecology, Management, and Conservation CY SEP 28-30, 1993 CL KNOXVILLE, TN SP SO APPALACHIAN MAN & BIOSPHERE, OAK RIDGE NATL LAB, ENVIRONM SCI DIV, TENNESSEE VALLEY AUTHORITY, USDA, FOREST SERV ID FORESTS AB The function of wetland ecosystems is not independent of the landscapes in which they are embedded. They have strong physical and biotic linkages to the surrounding landscape. Therefore, incorporating a broad-scale perspective in our study of wetland ecology will promote our understanding of these habitats in the Southern Appalachians. Changes in the surrounding landscape will likely affect wetlands. Broad-scale changes that are likely to affect wetlands include: 1) climate change, 2) land use and land cover change, 3) water and air-borne pollution, 4) a shift in disturbance/recovery regimes, and 5) habitat loss and fragmentation. Changes in climate and land cover can affect the hydrology of the landscape and, therefore, the water balance of wetlands. Excessive nutrients and toxin transported by air and water to wetlands can disrupt natural patterns of nutrient cycling. Periodic disturbances, like flooding in riparian zones, is required to maintain some wetlands. A change in disturbance regimes, such as an increase in fire frequency, could alter species composition and nutrient cycles in certain wetlands. Many plant and animal species that found in small, isolated wetlands have populations that are dependent on complementary habitats found in the surrounding landscape. Loss or fragmentation of these complementary habitats could result in the collapse of wetland populations. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. NR 31 TC 15 Z9 16 U1 4 U2 15 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 OCT PY 1994 VL 77 IS 3-4 BP 321 EP 332 DI 10.1007/BF00478425 PG 12 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA QD818 UT WOS:A1994QD81800010 ER PT J AU TRETTIN, CC AUST, WM WISNIEWSKI, J AF TRETTIN, CC AUST, WM WISNIEWSKI, J TI WETLANDS OF THE INTERIOR SOUTHEASTERN UNITED-STATES - PREFACE SO WATER AIR AND SOIL POLLUTION LA English DT Editorial Material C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. VIRGINIA POLYTECH INST & STATE UNIV,DEPT FORESTRY,BLACKSBURG,VA 24061. WISNIEWSKI & ASSOCIATES INC,FALLS CHURCH,VA 22043. NR 1 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD OCT PY 1994 VL 77 IS 3-4 BP R9 EP R9 DI 10.1007/BF00478416 PG 1 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA QD818 UT WOS:A1994QD81800002 ER PT J AU TANAKA, T GOKCEN, NA IIDA, T MORITA, Z AF TANAKA, T GOKCEN, NA IIDA, T MORITA, Z TI THERMODYNAMIC RELATIONSHIP BETWEEN THE ENTHALPY INTERACTION PARAMETER AND THE ENTROPY INTERACTION PARAMETER IN LIQUID-IRON NITROGEN BASED TERNARY ALLOYS SO ZEITSCHRIFT FUR METALLKUNDE LA English DT Article ID BINARY-ALLOYS; EXCESS ENTROPY; SOLUTE ELEMENTS; MODEL AB A statistical thermodynamic solution model based on the free volume theory is applied to liquid iron-nitrogen based ternary alloys to derive the relationship between the enthalpy interaction parameter and the entropy interaction parameter. A linear relationship between those parameters is obtained. Then, Wagner's interaction parameters of nitrogen with some metallic elements in liquid iron alloys are evaluated. These results show that the free volume of the solute elements is an important factor to determine the excess entropy terms in those alloys. C1 US BUR MINES,ALBANY RES CTR,ALBANY,OR 97321. RP TANAKA, T (reprint author), OSAKA UNIV,FAC ENGN,DEPT MAT SCI & PROC,2-1 YAMADAOKA,SUITA,OSAKA 565,JAPAN. NR 17 TC 4 Z9 4 U1 0 U2 0 PU CARL HANSER VERLAG PI MUNICH PA KOLBERGERSTRASSE 22, POSTFACH 860420, W-8163 MUNICH, GERMANY SN 0044-3093 J9 Z METALLKD JI Z. Metallk. PD OCT PY 1994 VL 85 IS 10 BP 696 EP 700 PG 5 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA PQ479 UT WOS:A1994PQ47900004 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E AJNINENKO, IK ALEKSAN, R ALEKSEEV, GD ALLPORT, PP ALMEHED, S ALMEIDA, FML ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEGALLI, M BEILLIERE, P BELTRAN, P BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLOCKI, J BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUGGE, L BURAN, T BUYS, A BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASES, R CASO, C CASTELLI, E GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COSMO, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVIES, J DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C LASO, MDMD DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EHRET, R EKELOF, T EKSPONG, G ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FALALEEV, V FASSOULIOTIS, D FEINDT, M FENYUK, A FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORMENTI, F FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GELE, D GERBER, JP GIACOMELLI, P GILLESPIE, D GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY GOPAL, G GORN, L GORSKI, M GRACCO, V GRARD, F GRAZIANI, E GROSDIDIER, G GUNNARSSON, P GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERNANDO, JA HERQUET, P HERR, H HESSING, TL HIGON, E HILKE, HJ HILL, TS HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HONORE, PF HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JACOBSSON, R JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONKER, M JONSSON, L JUILLOT, P KAISER, M KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUPINSKI, W KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTI, S MARTINEZRIVERO, C MARTINEZVIDAL, F MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NILSEN, PES NISS, P NOMEROTSKI, A NORMAND, A NOVAK, M OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PHILLIPS, HT PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G ROMERO, A RONCAGLIOLO, I RONCHESE, P ROOS, L ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SAJOT, G LOPEZFERNANDEZ, A SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKAALI, TB SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVITSKI, I STAVROPOULOS, G STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M TABARELLI, T TCHIKILEV, O THEODOSIOU, GE THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORASSA, E TORTORA, L TRANSTROMER, G TREILLE, D TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VANELDIK, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M WAHLEN, H WALCK, C WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YIP, K YUSHCHENKO, O ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G AF ABREU, P ADAM, W ADYE, T AGASI, E AJNINENKO, IK ALEKSAN, R ALEKSEEV, GD ALLPORT, PP ALMEHED, S ALMEIDA, FML ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEGALLI, M BEILLIERE, P BELTRAN, P BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLOCKI, J BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUGGE, L BURAN, T BUYS, A BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASES, R CASO, C CASTELLI, E GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COSMO, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVIES, J DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C LASO, MDMD DELAVAISSIERE, C DELOTTO, B DEMIN, A DEPAULA, L DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EHRET, R EKELOF, T EKSPONG, G ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FALALEEV, V FASSOULIOTIS, D FEINDT, M FENYUK, A FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORMENTI, F FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GELE, D GERBER, JP GIACOMELLI, P GILLESPIE, D GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY GOPAL, G GORN, L GORSKI, M GRACCO, V GRARD, F GRAZIANI, E GROSDIDIER, G GUNNARSSON, P GUY, J HAEDINGER, U HAHN, F HAHN, M HAHN, S HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERNANDO, JA HERQUET, P HERR, H HESSING, TL HIGON, E HILKE, HJ HILL, TS HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HONORE, PF HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JACOBSSON, R JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONKER, M JONSSON, L JUILLOT, P KAISER, M KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUPINSKI, W KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTI, S MARTINEZRIVERO, C MARTINEZVIDAL, F MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NILSEN, PES NISS, P NOMEROTSKI, A NORMAND, A NOVAK, M OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PHILLIPS, HT PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G ROMERO, A RONCAGLIOLO, I RONCHESE, P ROOS, L ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SAJOT, G LOPEZFERNANDEZ, A SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKAALI, TB SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVITSKI, I STAVROPOULOS, G STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M TABARELLI, T TCHIKILEV, O THEODOSIOU, GE THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORASSA, E TORTORA, L TRANSTROMER, G TREILLE, D TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VANELDIK, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M WAHLEN, H WALCK, C WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YIP, K YUSHCHENKO, O ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G TI SEARCH FOR PAIR-PRODUCED HEAVY SCALARS IN Z(0) DECAYS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID CHARGED HIGGS; E+E ANNIHILATION; Z0 DECAYS; TECHNIPIONS; PETRA; LEP AB A search for charged Higgs bosons decaying into quarks is described, based on statistics of around 1.7 million hadronic Z0 decays detected in DELPHI. Despite the very high background from standard hadronic decays of the Z0, masses in the range up to 43.5 GeV/c2 are excluded at the 95% confidence level. After combination with a search for leptonic decays, this mass limit is extended to cover all branching ratios. A similar analysis sets new limits on the possible production of any pair-produced heavy scalar decaying into a pair of jets, such as neutral Higgs bosons in a two doublet scheme and diquarks. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. ULB,VUB,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. INFN,I-40126 BOLOGNA,ITALY. COLL FRANCE,IN2P3,PHYS CORPUSCULAIRE LAB,CNRS,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. ULP,IN2P3,CTR RECH NUCL,CNRS,F-67037 STRASBOURG,FRANCE. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. CAS,INST PHYS,FZU,DIV HIGH ENERGY PHYS,18040 PRAGUE 8,CZECH REPUBLIC. INFN,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,IN2P3,INST SCI NUCL,CNRS,F-38026 GRENOBLE,FRANCE. JOINT NUCL RES INST,MOSCOW 101000,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76128 KARLSRUHE,GERMANY. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. UNIV PARIS 11,IN2P3,ACCELERATEUR LINEAIRE LAB,CNRS,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. IST,FCUL,LIP,P-1000 LISBON,PORTUGAL. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV PARIS 06,IN2P3,LPNHE,CNRS,F-75252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV LYON 1,IPNL,IN2P3,CNRS,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,IN2P3,CPP,CNRS,F-13288 MARSEILLE 09,FRANCE. INFN,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. CHARLES UNIV,MFF,CTR NUCL,CS-18000 PRAGUE 8,CZECH REPUBLIC. NATL INST NUCL PHYS & HIGH ENERGY PHYS,1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV OVIEDO,DEPT FIS,E-33006 OVIEDO,SPAIN. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. INFN,I-35131 PADUA,ITALY. PONTIFICIA UNIV CATOLICA,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. CENS,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. INFN,IST SUPER SANITA,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN. HIGH ENERGY PHYS INST,PROTVINO,RUSSIA. UNIV LJUBLJANA,DEPT PHYS,LJUBLJANA 61000,SLOVENIA. UNIV STOCKHOLM,S-11385 STOCKHOLM,SWEDEN. UNIV TORINO,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. UNIV FED RIO JANEIRO,BR-21945970 RIO JANEIRO,BRAZIL. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. CSIC,IFIC,E-46100 BURJASSOT,SPAIN. INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV WUPPERTAL,FACHBEREICH PHYS,D-42097 WUPPERTAL 1,GERMANY. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. SEFT,HIGH ENERGY PHYS RES INST,SF-00014 HELSINKI,FINLAND. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. UNIV PARIS 07,IN2P3,LPNHE,CNRS,F-75252 PARIS 05,FRANCE. INFN,I-00173 ROME,ITALY. J STEFAN INST,LJUBLJANA 61000,SLOVENIA. INFN,I-10125 TURIN,ITALY. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. RP ABREU, P (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Gomez Cadenas, Juan Jose/L-2003-2014; Hernando Morata, Jose Angel/L-7642-2014; gandelman, miriam/N-3739-2014; Ragazzi, Stefano/D-2463-2009; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Smirnova, Oxana/A-4401-2013; Lozano-Bahilo, Julio/F-4881-2016; Olshevskiy, Alexander/I-1580-2016; Paganoni, Marco/A-4235-2016; 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; Nemecek, Stanislav/G-5931-2014; Ridky, Jan/H-6184-2014; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Espirito Santo, Maria Catarina/L-2341-2014; Pimenta, Mario/M-1741-2013; Nomerotski, Andrei/A-5169-2010; Dracos, Marcos/K-2335-2012; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Krammer, Manfred/A-6508-2010; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Torassa, Ezio/I-1788-2012; Giacomelli, Paolo/B-8076-2009; Fruhwirth, Rudolf/H-2529-2012; Andreazza, Attilio/E-5642-2011; Verlato, Marco/J-4604-2012; Contreras Gonzalez, Jose Luis/K-7255-2014; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; Yip, Kin/D-6860-2013; OI Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Hernando Morata, Jose Angel/0000-0002-8683-5142; Ragazzi, Stefano/0000-0001-8219-2074; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Smirnova, Oxana/0000-0003-2517-531X; Lozano-Bahilo, Julio/0000-0003-0613-140X; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Vaz, Pedro/0000-0002-7186-2359; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Tome, Bernardo/0000-0002-7564-8392; Espirito Santo, Maria Catarina/0000-0003-1286-7288; Pimenta, Mario/0000-0002-2590-0908; Dracos, Marcos/0000-0003-0514-193X; Ruiz, Alberto/0000-0002-3639-0368; Krammer, Manfred/0000-0003-2257-7751; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; Andreazza, Attilio/0000-0001-5161-5759; Verlato, Marco/0000-0003-1967-7655; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Matteuzzi, Clara/0000-0002-4047-4521; DE MIN, ALBERTO/0000-0002-8130-9389; Demaria, Natale/0000-0003-0743-9465; Bonesini, Maurizio/0000-0001-5119-1896; Sannino, Mario/0000-0001-7700-8383; Maio, Amelia/0000-0001-9099-0009; De Angelis, Alessandro/0000-0002-3288-2517; Yip, Kin/0000-0002-8576-4311; 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 22 TC 13 Z9 13 U1 0 U2 3 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 OCT PY 1994 VL 64 IS 2 BP 183 EP 193 PG 11 WC Physics, Particles & Fields SC Physics GA PP614 UT WOS:A1994PP61400001 ER PT J AU ALBER, T APPELSHAUSER, H BACHLER, J BARTKE, J BIALKOWSKA, H BLOOMER, MA BOCK, R BRAITHWAITE, WJ BRINKMANN, D BROCKMANN, R BUNCIC, P CHAN, P CHASE, SI CRAMER, JG CRAMER, PB DERADO, I ECKARDT, V ESCHKE, J FAVUZZI, C FERENC, D FLEISCHMANN, B FOKA, P FUCHS, M GAZDZICKI, M GLADYSZ, E GUNTHER, J HARRIS, JW HOFFMANN, M JACOBS, P KABANA, S KADIJA, K KOSIEC, J KOWALSKI, M KUHMICHEL, A LEE, JY LJUBICIC, A MARGETIS, S MITCHELL, JT MORSE, R NAPPI, E ODYNIEC, G PAIC, G PANAGIOTOU, AD PETRIDIS, A PIPER, A POSA, F POSKANZER, AM PUHLHOFER, F RAI, G RAUCH, W RENFORDT, R RETYK, W ROHRICH, D ROLAND, G ROTHARD, H RUNGE, K SANDOVAL, A SCHAMBACH, J SCHMITZ, N SCHMOETTEN, E SENDELBACH, R SEYBOTH, P SEYERLEIN, J SKRZYPCZAK, E SPINELLI, P STEFANSKI, P STOCK, R STROBELE, H TEITELBAUM, L TONSE, S TRAINOR, TA VASILEIADIS, G VASSILIOU, M VRANIC, D WENIG, S WOSIEK, B ZHU, X AF ALBER, T APPELSHAUSER, H BACHLER, J BARTKE, J BIALKOWSKA, H BLOOMER, MA BOCK, R BRAITHWAITE, WJ BRINKMANN, D BROCKMANN, R BUNCIC, P CHAN, P CHASE, SI CRAMER, JG CRAMER, PB DERADO, I ECKARDT, V ESCHKE, J FAVUZZI, C FERENC, D FLEISCHMANN, B FOKA, P FUCHS, M GAZDZICKI, M GLADYSZ, E GUNTHER, J HARRIS, JW HOFFMANN, M JACOBS, P KABANA, S KADIJA, K KOSIEC, J KOWALSKI, M KUHMICHEL, A LEE, JY LJUBICIC, A MARGETIS, S MITCHELL, JT MORSE, R NAPPI, E ODYNIEC, G PAIC, G PANAGIOTOU, AD PETRIDIS, A PIPER, A POSA, F POSKANZER, AM PUHLHOFER, F RAI, G RAUCH, W RENFORDT, R RETYK, W ROHRICH, D ROLAND, G ROTHARD, H RUNGE, K SANDOVAL, A SCHAMBACH, J SCHMITZ, N SCHMOETTEN, E SENDELBACH, R SEYBOTH, P SEYERLEIN, J SKRZYPCZAK, E SPINELLI, P STEFANSKI, P STOCK, R STROBELE, H TEITELBAUM, L TONSE, S TRAINOR, TA VASILEIADIS, G VASSILIOU, M VRANIC, D WENIG, S WOSIEK, B ZHU, X TI STRANGE PARTICLE-PRODUCTION IN NUCLEAR COLLISIONS AT 200 GEV PER NUCLEON SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID HEAVY-ION COLLISIONS; QUARK-GLUON PLASMA; MODEL; DISTRIBUTIONS; SUPPRESSION; GEV/NUCLEON; ENHANCEMENT; 200-GEV/C; ENERGIES; SULFUR AB Multiplicities and spectra of strange particles (LAMBDA, LAMBDABAR, K(S)0, K+ and K-) produced in central S-32+S, S-32+Ag and S-32+Au collisions at 200 GeV per nucleon are presented and compared with data on strange particle production in proton-nucleus and nucleon-nucleon interactions. It is shown that strangeness production in S-32+Ag collisions is enhanced by a factor of two, similar to that found previously in central S-32+S collisions. C1 INFN BARI,BARI,ITALY. GESELL SCHWERIONENFORSCH MBH,W-6100 DARMSTADT 11,GERMANY. UNIV FRANKFURT,FACHBEREICH PHYS,W-6000 FRANKFURT,GERMANY. UNIV FREIBURG,FAK PHYS,W-7800 FREIBURG,GERMANY. UNIV MARBURG,FACHBEREICH PHYS,W-3550 MARBURG,GERMANY. RUDJER BOSKOVIC INST,ZAGREB,CROATIA. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. INST NUCL PHYS,PL-31342 KRAKOW,POLAND. MAX PLANCK INST PHYS & ASTROPHYS,MUNICH,GERMANY. UNIV WASHINGTON,SEATTLE,WA 98195. UNIV WARSAW,INST EXPTL PHYS,PL-00325 WARSAW,POLAND. INST NUCL STUDIES,WARSAW,POLAND. UNIV BARI,DIPARTIMENTO FIS,I-70124 BARI,ITALY. RP ALBER, T (reprint author), UNIV ATHENS,ATHENS,GREECE. NR 53 TC 154 Z9 155 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD OCT PY 1994 VL 64 IS 2 BP 195 EP 207 PG 13 WC Physics, Particles & Fields SC Physics GA PP614 UT WOS:A1994PP61400002 ER PT J AU BEKER, H BOGGILD, H BOISSEVAIN, J CHERNEY, M DODD, J ESUMI, S FABJAN, CW FIELDS, DE FRANZ, A HANSEN, KH HOLZER, B HUMANIC, T JACAK, B JAYANTI, R KALECHOFSKY, H KOBAYASHI, T KVATADZE, R LEE, YY LELTCHOUK, M LORSTAD, B MAEDA, N MEDVEDEV, A MIAKE, Y MIYABAYASHI, A MURRAY, M NAGAMIYA, S NISHIMURA, S NOTEBOOM, E PANDEY, SU PIUZ, F POLYCHRONAKOS, V POTEKHIN, M POULARD, G SAKAGUCHI, A SARABURA, M SHIGAKI, K SIMONGILLO, J SLETTEN, H SONDHEIM, W SUGITATE, T SULLIVAN, JP SUMI, Y VANHECKE, H WILLIS, WJ WOLF, K AF BEKER, H BOGGILD, H BOISSEVAIN, J CHERNEY, M DODD, J ESUMI, S FABJAN, CW FIELDS, DE FRANZ, A HANSEN, KH HOLZER, B HUMANIC, T JACAK, B JAYANTI, R KALECHOFSKY, H KOBAYASHI, T KVATADZE, R LEE, YY LELTCHOUK, M LORSTAD, B MAEDA, N MEDVEDEV, A MIAKE, Y MIYABAYASHI, A MURRAY, M NAGAMIYA, S NISHIMURA, S NOTEBOOM, E PANDEY, SU PIUZ, F POLYCHRONAKOS, V POTEKHIN, M POULARD, G SAKAGUCHI, A SARABURA, M SHIGAKI, K SIMONGILLO, J SLETTEN, H SONDHEIM, W SUGITATE, T SULLIVAN, JP SUMI, Y VANHECKE, H WILLIS, WJ WOLF, K TI KAON INTERFEROMETRY IN HEAVY-ION COLLISIONS AT THE CERN SPS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID BOSE-EINSTEIN CORRELATIONS; PION INTERFEROMETRY; 2-PION CORRELATIONS; NUCLEAR COLLISIONS; PLASMA AB K+K+ and K-K- correlations from S + Pb collisions at 200 GeV/c per nucleon and K+K+ correlations from p + Pb collisions at 450 GeV/c per nucleon, are presented as measured by the focusing spectrometer of the NA44 experiment at CERN. Multidimensional fits are performed in order to characterize the kaon-emission volume, which is found to be smaller than the pion-emission volume. C1 CERN,CH-1211 GENEVA 23,SWITZERLAND. NIELS BOHR INST,COPENHAGEN,DENMARK. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. CREIGHTON UNIV,OMAHA,NE 68178. COLUMBIA UNIV,NEW YORK,NY 10027. HIROSHIMA UNIV,HIROSHIMA 724,JAPAN. OHIO STATE UNIV,COLUMBUS,OH 43210. UNIV PITTSBURGH,PITTSBURGH,PA 15260. NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. LUND UNIV,S-22362 LUND,SWEDEN. BROOKHAVEN NATL LAB,UPTON,NY 11973. TEXAS A&M UNIV,COLLEGE STN,TX 77843. UNIV TOKYO,TOKYO 113,JAPAN. NR 29 TC 46 Z9 47 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 OCT PY 1994 VL 64 IS 2 BP 209 EP 217 DI 10.1007/BF01557392 PG 9 WC Physics, Particles & Fields SC Physics GA PP614 UT WOS:A1994PP61400003 ER PT J AU ATWOOD, D SONI, A AF ATWOOD, D SONI, A TI INFLUENCE OF KAONIC RESONANCES ON THE CP VIOLATION IN B-]K-ASTERISK-GAMMA LIKE PROCESSES SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID KOBAYASHI-MASKAWA MATRIX; CHARMLESS B-DECAYS; TOP-QUARK; SEMILEPTONIC DECAYS; WEINBERG MODEL; STANDARD MODEL; MESONS; ASYMMETRIES; NONCONSERVATION; PARAMETRIZATION AB We consider CP violating effects in decays of the type B --> k(i)gamma --> Kpigamma, K*pigamma and Krhogamma, where k(i) represents a strange meson resonance. We include in our calculations five of the low-lying resonances with quantum numbers (J(P)) 1-, 1+ and 2+. At the quark level these decays are driven by the penguin graph as well as tree graphs. CP violation arises in the Standard Model due to the difference in the CKM phase between these graphs. We model the final state interaction of the hadronic system using the low lying k(i) resonances. Bound state effects are incorporated by using ideas based on the model of Grinstein et al. and also in another bound state model (somewhat similar to the model of Wirbel et al.) which we construct designed to take into account relativistic effects better. In these models we find that radiative decays of B mesons give rise to four of the five kaonic resonances at about 1 to 7% of the inclusive b --> sgamma rate. Furthermore, in both bound state models we find that the probability of formation of the other three higher resonances is roughly the same as that of K* (892), which was recently seen at CLEO. In addition to the partial rate asymmetry which arises due to interference between resonances of the same quantum numbers, we show how interference between resonances of the same parity, and also between resonances of the opposite parity, result in two different types of energy asymmetries. CP differential asymmetries at the level of a few percent seem possible. We thus obtain CP violating distributions which may be observed in a sample of about 10(9) B+/- mesons. For concreteness in this paper we deal with only charged B's, neutral B's will be dealt with separately. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP ATWOOD, D (reprint author), STANFORD UNIV,SLAC,DEPT PHYS,STANFORD,CA 94309, USA. NR 51 TC 28 Z9 28 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 OCT PY 1994 VL 64 IS 2 BP 241 EP 254 DI 10.1007/BF01557395 PG 14 WC Physics, Particles & Fields SC Physics GA PP614 UT WOS:A1994PP61400006 ER PT J AU HAMZA, AV BALOOCH, M MOALEM, M OLANDER, DR AF HAMZA, AV BALOOCH, M MOALEM, M OLANDER, DR TI C-58 PRODUCTION FROM DISSOCIATION OF C-60 BY SCATTERING FROM SILICA AND HIGHLY ORIENTED PYROLYTIC-GRAPHITE SO CHEMICAL PHYSICS LETTERS LA English DT Article AB The dissociation of C-60 to C-58 has been observed on surfaces of silica and highly oriented pyrolytic graphite by modulated molecular beam reaction spectroscopy. At 1200 K on both surfaces approximately 5% of the incident C-60 dissociates and desorbs as C-58. The activation energy for C-58 production from C-60 on the surface (approximate to 2.5 eV) is considerably smaller than that required in the gas phase, possibly due to the stabilization of the C-1 or C-2 products on the surface. At surface temperatures between 1000 and 1200 K, carbon was detected on the SiO2 surface. C1 UNIV CALIF BERKELEY,DEPT NUCL ENGN,BERKELEY,CA 94720. RP HAMZA, AV (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94551, USA. NR 7 TC 7 Z9 7 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 SEP 30 PY 1994 VL 228 IS 1-3 BP 117 EP 121 DI 10.1016/0009-2614(94)00919-8 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PJ977 UT WOS:A1994PJ97700020 ER PT J AU HUTCHINSON, SA NG, KT SHADID, JN AF HUTCHINSON, SA NG, KT SHADID, JN TI A FINITE-ELEMENT ALGORITHM FOR ELLIPTIC-EQUATIONS OVER UNSTRUCTURED DOMAINS ON A DATA-PARALLEL COMPUTER SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING LA English DT Article ID CONJUGATE-GRADIENT METHOD AB In the past, most finite element algorithms on data-parallel computers have been limited to structured problem domains. Here, we consider methods to generalize the finite element method on data-parallel architectures to unstructured domains. A nodal assembly algorithm is described which effectively allows for both the generation of the sparse interaction matrix (coefficient matrix) and its solution via a preconditioned conjugate-gradient type routine utilizing several polynomial preconditioners on the Connection Machine 200 (CM-200). Jacobi preconditioning along with Neumann series and least-squares polynomial preconditioners are presented and implemented. Only the Jacobi preconditioner produces an improvement in the convergence time for the problems examined. Several irregular interprocessor communication protocols available on the CM-200 are investigated in the solution portion of the algorithm, yielding differing performance characteristics. For one such protocol, sustained performance of over two-hundred MFlops/s. is demonstrated for a test problem on a 512 processing element CM-200 in slicewise mode. The results are discussed and conclusions are drawn concerning this finite element algorithm. C1 SANDIA NATL LABS,DEPT PARALLEL COMPUTAT SCI,ALBUQUERQUE,NM 87185. RP HUTCHINSON, SA (reprint author), NEW MEXICO STATE UNIV,DEPT ELECT & COMP ENGN,LAS CRUCES,NM 88003, USA. NR 22 TC 6 Z9 6 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0029-5981 J9 INT J NUMER METH ENG JI Int. J. Numer. Methods Eng. PD SEP 30 PY 1994 VL 37 IS 18 BP 3153 EP 3167 DI 10.1002/nme.1620371809 PG 15 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA PH300 UT WOS:A1994PH30000008 ER PT J AU YOSHIDA, T WILLARDSON, BM WILKINS, JF JENSEN, GJ THORNTON, BD BITENSKY, MW AF YOSHIDA, T WILLARDSON, BM WILKINS, JF JENSEN, GJ THORNTON, BD BITENSKY, MW TI THE PHOSPHORYLATION STATE OF PHOSDUCIN DETERMINES ITS ABILITY TO BLOCK TRANSDUCIN SUBUNIT INTERACTIONS AND INHIBIT TRANSDUCIN BINDING TO ACTIVATED RHODOPSIN SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID BETA-GAMMA-SUBUNITS; ROD OUTER SEGMENTS; G-PROTEIN; PHOTORECEPTOR CELLS; PHOSPHOLIPASE-C; CYCLIC-GMP; BOVINE; LIGHT; RETINA; KINASE AB Heterotrimeric GTP-binding proteins (G-proteins) serve many different signal transduction pathways. Phosducin, a 28-kDa phosphoprotein, is expressed in a variety of mammalian cell types and blocks activation of several classes of G-proteins. Phosphorylation of phosducin by cyclic AMP-dependent protein kinase prevents phosducin-mediated inhibition of G-protein GTPase activity (Bauer, P. H., Muller, S., Puzicha, M., Pippig, S., Obermaier, B., Helmreich, E. J. M., and Lohse, M. J. (1992) Nature 358, 73-76). In retinal rods, phosducin inhibits transducin (G(t)) activation by binding its beta gamma subunits. While rod phosducin is phosphorylated in the dark and dephosphorylated after illumination (Lee, R.H., Brown, B. M., and Lolley, R. N. (1984) Biochemistry 23, 1972-1977), the significance of these reactions is still unclear. The data presented here permit a more precise characterization of phosducin function and the consequences of its phosphorylation. Dephosphophosducin blocked binding of the G(t) alpha(1) subunit to activated rhodopsin in the presence of stoichiometric amounts of G(t) beta gamma, whereas phosphophosducin did not. Surprisingly, the binding affinity of phosphophosducin for G(t) beta gamma was not significantly reduced compared with the binding affinity of dephosphophosducin. However, the association of phosducin with G(t) beta gamma in a size exclusion column matrix was dependent on the phosphorylation state of phosducin. Moreover, the ability of phosducin to compete with G(t) alpha for binding to G(t) beta gamma was also dependent on the phosphorylation state of phosducin. No interaction was found between phosducin and G(t) alpha. These data indicate that phosducin decreases rod responsiveness by binding to the beta gamma subunits of G(t) and preventing their interaction with G(t) alpha, thereby inhibiting G(t) alpha activation by the activated receptor. Moreover phosphorylation of phosducin blocks its ability to compete with G(t) alpha for binding to G(t) beta gamma. C1 LOS ALAMOS NATL LAB,DIV PHYS,BIOPHYS GRP,LOS ALAMOS,NM 87545. RI Wilkins, Jon/A-4984-2009 OI Wilkins, Jon/0000-0001-6405-6538 FU NEI NIH HHS [EY 06816] NR 35 TC 112 Z9 112 U1 0 U2 1 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD SEP 30 PY 1994 VL 269 IS 39 BP 24050 EP 24057 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA PQ346 UT WOS:A1994PQ34600034 PM 7929057 ER PT J AU NORTON, DP CHAKOUMAKOS, BC BUDAI, JD LOWNDES, DH SALES, BC THOMPSON, JR CHRISTEN, DK AF NORTON, DP CHAKOUMAKOS, BC BUDAI, JD LOWNDES, DH SALES, BC THOMPSON, JR CHRISTEN, DK TI SUPERCONDUCTIVITY IN SRCUO2-BACUO2 SUPERLATTICES - FORMATION OF ARTIFICIALLY LAYERED SUPERCONDUCTING MATERIALS SO SCIENCE LA English DT Article ID PULSED-LASER DEPOSITION; CU-O SYSTEM; YBA2CU3O7-X/PRBA2CU3O7-X SUPERLATTICES; EPITAXIAL-GROWTH; OXIDES; FILMS AB Pulsed-laser deposition was used to synthesize artificially layered high-temperature superconductors. Thin-film compounds were formed when the constraint of epitaxy was used to stabilize SrCuO2-BaCuO2 superlattices in the infinite layer structure. Using this approach, two new structural families, Ba2Srn-1Cun+1O2n+2+delta and Ba4Srn-1Cun+3O2n+6+delta, have been synthesized; these families superconduct at temperatures as high as 70 kelvin. RP NORTON, DP (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. RI Christen, David/A-9709-2008; Chakoumakos, Bryan/A-5601-2016; Budai, John/R-9276-2016 OI Chakoumakos, Bryan/0000-0002-7870-6543; Budai, John/0000-0002-7444-1306 NR 23 TC 79 Z9 79 U1 2 U2 21 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD SEP 30 PY 1994 VL 265 IS 5181 BP 2074 EP 2077 DI 10.1126/science.265.5181.2074 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PJ912 UT WOS:A1994PJ91200024 PM 17811410 ER PT J AU NOSHKIN, VE ROBISON, WL WONG, KM AF NOSHKIN, VE ROBISON, WL WONG, KM TI CONCENTRATION OF 210PO AND PB-210 IN THE DIET AT THE MARSHALL ISLANDS SO SCIENCE OF THE TOTAL ENVIRONMENT LA English DT Article DE MARSHALL ISLANDS; EFFECTIVE DOSE; DIET; RADIOACTIVITY; 210PO; PB-210 ID NATURAL RADIONUCLIDES; MARINE ORGANISMS; UK DIET; PO-210; RADIOACTIVITY; RADIATION; FISH AB The concentrations of Po-210 and Pb-210 have been determined in many local foods consumed by societies residing on different atolls in the Marshall Islands. The average daily intake of these two naturally occurring radionuclides from local and imported food is estimated to be 2.18 and 0.36 Bq, respectively. Local foods contribute 87% of the Po-210 and 47% of the Pb-210 associated with the diet. The items contributing the majority of the activity to the diet are derived from the marine environment and include parts of fish, invertebrates, seabirds and eggs of seabirds. The committed effective dose from ingestion of Po-210 and Pb-210 is approximately 2 mSv/year (200 mrem/year). This pathway now contributes 83% of the natural background irradiation received by residents in the Marshall Islands. Because the naturally occurring radionuclides are omnipresent in terrestrial and marine foods at all atolls, the annual intake and computed dose can be considered as typical values for individuals with comparable diets and inhabiting other islands in the Pacific. RP NOSHKIN, VE (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV HLTH & ECOL ASSESSMENT L453,POB 808,LIVERMORE,CA 94550, USA. NR 38 TC 30 Z9 30 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0048-9697 J9 SCI TOTAL ENVIRON JI Sci. Total Environ. PD SEP 30 PY 1994 VL 155 IS 1 BP 87 EP 104 DI 10.1016/0048-9697(94)90364-6 PG 18 WC Environmental Sciences SC Environmental Sciences & Ecology GA PF442 UT WOS:A1994PF44200009 PM 7973614 ER PT J AU CHANG, YJ CASTNER, EW AF CHANG, YJ CASTNER, EW TI DEUTERIUM-ISOTOPE EFFECTS ON THE ULTRAFAST SOLVENT RELAXATION OF FORMAMIDE AND N,N-DIMETHYLFORMAMIDE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID IMPULSIVE STIMULATED SCATTERING; DEPOLARIZED RAYLEIGH-SCATTERING; FAR-INFRARED ABSORPTION; LIGHT-SCATTERING; SOLVATION DYNAMICS; MOLECULAR-DYNAMICS; VIBRATIONAL-SPECTRA; ELECTRON-TRANSFER; OPTICAL KERR; FEMTOSECOND DYNAMICS AB We present the results of our study on the ultrafast solvent dynamics of the amides formamide (FA), N,N-dimethylformamide (DMF), and their deuterated analogs HCOND2 (d(2)-FA) and DCON(CD3)(2) (d(7)-DMF) using femtosecond optical-heterodyne-detected Raman-induced Kerr effect spectroscopy (OHD-RIKES). Using nearly transform-limited 50 fs optical pulses and the Fourier-transform relationship, we have studied the liquid dynamics in the frequency range from 0.6 to 400 cm(-1). In comparison to the depolarized Rayleigh spectroscopy technique, OHD-RIKES is shown to provide more accurate and detailed information about the low-frequency region that includes the rotational reorientation, librational, and collision-induced dynamics. The effect of deuterium isotope substitution on the inertial as well as diffusive reorientational dynamics of these amide liquids is discussed. RP BROOKHAVEN NATL LAB, DEPT CHEM, BLDG 555A, UPTON, NY 11973 USA. NR 91 TC 91 Z9 92 U1 1 U2 14 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 SEP 29 PY 1994 VL 98 IS 39 BP 9712 EP 9722 DI 10.1021/j100090a003 PG 11 WC Chemistry, Physical SC Chemistry GA PJ469 UT WOS:A1994PJ46900006 ER PT J AU FRIED, LE RUGGIERO, AJ AF FRIED, LE RUGGIERO, AJ TI ENERGY-TRANSFER RATES IN PRIMARY, SECONDARY, AND INSENSITIVE EXPLOSIVES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID THERMAL-DECOMPOSITION; SEMIEMPIRICAL METHODS; DYNAMICS; SOLIDS; SHOCK; OPTIMIZATION; SIMULATION; PARAMETERS; CRYSTALS AB In this paper we focus on the relation between the propensity of a molecular crystal to undergo chemical reactions after impact or shock and energy transfer rates. When a crystal receives a shock, low-frequency lattice vibrations (called phonons) are excited. Typical phonon frequencies are 0-200 cm(-1). This energy must then be converted to bond stretch frequencies (1000-2000 cm(-1)) before bond breaking can occur. We derive a simple formula for the total energy transfer rate into a given vibron band in terms of the density of vibrational states and the vibron-phonon coupling. We are able to estimate the phonon upconversion rate in widely varying energetic materials such as TATB, HMX, and Pb styphnate by examining existing inelastic neutron scattering data. We find that the estimated energy transfer rates in pure unreacted material are several times greater for the sensitive explosives studied than the insensitive explosives. RP FRIED, LE (reprint author), LAWRENCE LIVERMORE NATL LAB, DEPT CHEM & MAT SCI, CTR ENERGY MAT, L-282, LIVERMORE, CA 94550 USA. RI Fried, Laurence/L-8714-2014 OI Fried, Laurence/0000-0002-9437-7700 NR 39 TC 90 Z9 95 U1 4 U2 18 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 SEP 29 PY 1994 VL 98 IS 39 BP 9786 EP 9791 DI 10.1021/j100090a012 PG 6 WC Chemistry, Physical SC Chemistry GA PJ469 UT WOS:A1994PJ46900015 ER PT J AU MAYER, RH NISIUS, DT BEARDEN, IG BHATTACHARYYA, P RICHTER, L SFERRAZZA, M GRABOWSKI, ZW DALY, PJ BRODA, R FORNAL, B AHMAD, I CARPENTER, MP HENRY, RG JANSSENS, RVF KHOO, TL LAURITSEN, T LIANG, Y BLOMQVIST, J AF MAYER, RH NISIUS, DT BEARDEN, IG BHATTACHARYYA, P RICHTER, L SFERRAZZA, M GRABOWSKI, ZW DALY, PJ BRODA, R FORNAL, B AHMAD, I CARPENTER, MP HENRY, RG JANSSENS, RVF KHOO, TL LAURITSEN, T LIANG, Y BLOMQVIST, J TI GAMMA-RAY STUDIES OF SN-119, SN-121, SN-123 ISOMERS FORMED IN DEEP-INELASTIC HEAVY-ION COLLISIONS SO PHYSICS LETTERS B LA English DT Article ID NUCLEI; SUBSHELL AB Yrast isomers in Sn-119, Sn-121 and Sn-123 have been identified among products of heavy ion collisions with 124Sn targets 10-15% above the Coulomb barrier. Isomeric decay schemes are reported, and further evidence for half-filling of the nuh11/2 subshell at N = 73 is presented. For (nuh11/2)n seniority-3 states, observed level energies agree well with results of fractional parentage calculations. C1 ROYAL INST TECHNOL,PHYS DEPT FRESCATI,S-10405 STOCKHOLM,SWEDEN. PURDUE UNIV,DEPT CHEM,W LAFAYETTE,IN 47907. INST NUCL PHYS,PL-31342 KRAKOW,POLAND. ARGONNE NATL LAB,ARGONNE,IL 60439. RP MAYER, RH (reprint author), PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907, USA. RI Bearden, Ian/M-4504-2014; Carpenter, Michael/E-4287-2015 OI Bearden, Ian/0000-0003-2784-3094; Carpenter, Michael/0000-0002-3237-5734 NR 13 TC 39 Z9 39 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 SEP 29 PY 1994 VL 336 IS 3-4 BP 308 EP 312 DI 10.1016/0370-2693(94)90537-1 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PJ434 UT WOS:A1994PJ43400007 ER PT J AU ALEXOPOULOS, T ALLEN, C ANDERSON, EW BALAMURALI, V BANERJEE, S BEERY, PD BHAT, P BISWAS, NN BUJAK, A CARMONY, DD CARTER, T COLE, P CHOI, Y DEBONTE, R DECARLO, V ERWIN, AE FINDEISEN, C GOSHAW, AT GUTAY, LJ HIRSCH, AS HOJVAT, C JENNINGS, JR KENNEY, VP LINDSEY, CS LOOMIS, C LOSECCO, JM MCMAHON, T MCMANUS, AP MORGAN, N NELSON, K OH, SH PORILE, NT RIMAI, A REEVES, D ROBERTSON, WJ SCHARENBERG, RP STRINGFELLOW, BC STAMPKE, SR THOMPSON, M TURKOT, F WALKER, WD WANG, CH WARCHOL, J WESSON, DK ZHAN, Y AF ALEXOPOULOS, T ALLEN, C ANDERSON, EW BALAMURALI, V BANERJEE, S BEERY, PD BHAT, P BISWAS, NN BUJAK, A CARMONY, DD CARTER, T COLE, P CHOI, Y DEBONTE, R DECARLO, V ERWIN, AE FINDEISEN, C GOSHAW, AT GUTAY, LJ HIRSCH, AS HOJVAT, C JENNINGS, JR KENNEY, VP LINDSEY, CS LOOMIS, C LOSECCO, JM MCMAHON, T MCMANUS, AP MORGAN, N NELSON, K OH, SH PORILE, NT RIMAI, A REEVES, D ROBERTSON, WJ SCHARENBERG, RP STRINGFELLOW, BC STAMPKE, SR THOMPSON, M TURKOT, F WALKER, WD WANG, CH WARCHOL, J WESSON, DK ZHAN, Y TI MULTIPLICITY DEPENDENCE OF TRANSVERSE-MOMENTUM SPECTRA OF CENTRALLY PRODUCED HADRONS IN (P)OVERBAR-P COLLISIONS AT 0.3, 0.54, 0.9, AND 1.8 TEV CENTER-OF-MASS ENERGY SO PHYSICS LETTERS B LA English DT Article ID ANTIPROTON-PROTON COLLISIONS; NUCLEUS-NUCLEUS COLLISIONS; PBARP INTERACTIONS; SQUARE-ROOT-S=1.8 TEV; PARTICLE-PRODUCTION; TEVATRON COLLIDER; CHARGED-PARTICLES; PHASE-TRANSITION; DRIFT CHAMBER; DISTRIBUTIONS AB Transverse momentum spectra of charged particles produced within the pseudo-rapidity range of eta = -0.36 to +1.0 have been measured in pBARp collisions at square-root s = 0.3, 0.54, 1.0, and 1.8 TeV. The spectra are presented as a function of event charged multiplicity within the range -3.25 < eta < 3.25. We found that the slope in the low p(t) region is independent of center-of-mass energy and multiplicity while the slope at the high p(t) region shows a strong energy and multiplicity dependence. C1 DUKE UNIV,DEPT PHYS,DURHAM,NC 27706. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556. PURDUE UNIV,DEPT PHYS & CHEM,W LAFAYETTE,IN 47907. UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. RP ALEXOPOULOS, T (reprint author), DE PAUW UNIV,DEPT PHYS,GREENCASTLE,IN 46135, USA. NR 24 TC 25 Z9 25 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD SEP 29 PY 1994 VL 336 IS 3-4 BP 599 EP 604 DI 10.1016/0370-2693(94)90578-9 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PJ434 UT WOS:A1994PJ43400049 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 ARYAL, M REAY, NW SIDWELL, RA STANTON, NR 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 NOMURA, M TAJIMA, H YOSHIDA, S DUNLEA, JM FREDERIKSEN, SG KURAMATA, S LUNDBERG, BG OLEYNIK, GA REIBEL, K 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 KAZUNO, M KOYA, T NIU, E OGAWA, S SHIBUYA, H WATANABE, S YASUDA, N KAMIYA, M SATO, Y TEZUKA, I YAMAKI, M 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 ARYAL, M REAY, NW SIDWELL, RA STANTON, NR 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 NOMURA, M TAJIMA, H YOSHIDA, S DUNLEA, JM FREDERIKSEN, SG KURAMATA, S LUNDBERG, BG OLEYNIK, GA REIBEL, K 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 KAZUNO, M KOYA, T NIU, E OGAWA, S SHIBUYA, H WATANABE, S YASUDA, N KAMIYA, M SATO, Y TEZUKA, I YAMAKI, M BAHK, SY KIM, SK TI MEASUREMENT OF GAMMA(D(0)-]K-GAMMA+NU)/GAMMA(D(0)-]MU+-X) USING A D-ASTERISK-TAG SO PHYSICS LETTERS B LA English DT Article ID PI-EMULSION INTERACTIONS; DECAYS; HADRONS; RATIO AB The relative branching fraction R(K) = GAMMA(D0 --> K- mu+ nu)/GAMMA(D0 --> mu+ X) has been measured by Fermilab experiment E653, using D0 mesons produced by 600 GeV pi-. The semimuonic decay sample of 232 events was identified by the decay chain D*+ --> D0pi+, D0 --> mu+h-X, where h is a hadron. The Kmunu component was extracted from the joint distribution of these events in the D0 decay variables M(min) and p(Th). We find R(K) = 0.472 +/- 0.051 (stat) +/- 0.040 (sys), and use a world average of the D0 --> Klnu branching fraction to obtain the D0 inclusive semimuonic branching fraction B(D0 --> mu+ X) = (7.67 +/- 1.13)%. C1 UNIV CALIF DAVIS,DAVIS,CA 95616. CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. GIFU UNIV,GIFU 50111,JAPAN. KANSAS STATE UNIV AGR & APPL SCI,MANHATTAN,KS 66506. KINKI UNIV,OSAKA,OSAKA 577,JAPAN. KOBE UNIV,KOBE 657,JAPAN. NAGOYA INST TECHNOL,NAGOYA,AICHI 466,JAPAN. NAGOYA UNIV,NAGOYA,AICHI 464,JAPAN. OHIO STATE UNIV,COLUMBUS,OH 43210. CHONNAM NATL UNIV,KWANGJU 500757,SOUTH KOREA. GYEONGSANG NATL UNIV,JINJU 660300,SOUTH KOREA. KOREA UNIV,SEOUL 136701,SOUTH KOREA. 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 22 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD SEP 29 PY 1994 VL 336 IS 3-4 BP 605 EP 613 DI 10.1016/0370-2693(94)90579-7 PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PJ434 UT WOS:A1994PJ43400050 ER PT J AU COSMAN, M FIALA, R HINGERTY, BE AMIN, S GEACINTOV, NE BROYDE, S PATEL, DJ AF COSMAN, M FIALA, R HINGERTY, BE AMIN, S GEACINTOV, NE BROYDE, S PATEL, DJ TI SOLUTION CONFORMATION OF THE (+)-TRANS-ANTI-[BP]DG ADDUCT OPPOSITE A DELETION SITE IN A DNA DUPLEX - INTERCALATION OF THE COVALENTLY ATTACHED BENZO[A]PYRENE INTO THE HELIX WITH BASE DISPLACEMENT OF THE MODIFIED DEOXYGUANOSINE INTO THE MAJOR GROOVE SO BIOCHEMISTRY LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; 2D NMR-SPECTRA; DIOL-EPOXIDES; REPETITIVE SEQUENCES; ESCHERICHIA-COLI; MUTAGENESIS; 7,8-DIOL-9,10-EPOXIDES; BINDING; OLIGONUCLEOTIDES; STEREOISOMERS AB This paper reports on the solution structure of the (+)-trans-anti-[BP]dG adduct positioned opposite a deletion site in a DNA oligomer duplex which defines the alignment of this covalent benzo[a]pyrene-N-2-deoxyguanosine stereoisomer relative to the deletion site. The combined NMR-molecular mechanics computation studies were undertaken on the (+)-trans-anti- [BP]dG adduct embedded in the d(C5-[BP]G6-C7).d(G16-G17) sequence context in a duplex containing 11 residues on the modified strand and 10 on the partner, with no base opposite the modification. The exchangeable and nonexchangeable protons of the benzo[a]pyrenyl moiety and the nucleic acid were assigned following analysis of two-dimensional NMR data sets in H2O and D2O solution. The solution conformation of the (+)-trans-anti-[BP]dG.del 11-mer duplex has been determined by incorporating intramolecular and intermolecular proton-proton distances defined by lower and upper bounds deduced from NOESY spectra as restraints in molecular mechanics computations in torsion angle space. The benzo[a]pyrene ring of [BP]dG6 is intercalated between intact Watson-Crick dC5.dG17 and dC7.dG16 base pairs with the deoxyguanosine base of [BP]dG6 displaced into the major groove. The intercalation site is wedge shaped, being narrower toward the dG16-dG17 step on the deletion-containing strand. The deoxyguanosine base of [BP]dG6 which is positioned in the major groove is inclined relative to the helix axis and stacks over the 5'-flanking dC5 residue in the solution structure. The intercalative-base displacement structure of the (+)-trans-anti-[BP]dG.del 11-mer duplex exhibits several unusually shifted proton resonances which can be readily accounted for by the ring current contribution of the deoxyguanosyl and pyrenyl rings of the [BP]dG6 adduct. This solution structure of the (+)-trans-anti-[BP] 11-mer duplex where the pyrene ring intercalates into the helix with displacement of the modified deoxyguanosine into the major groove strikingly contrasts with our previous study on the (+)-trans-anti-[BP]dG.dC 11-mer duplex [Cosman, M., et al. (1992) Proc, Natl. Acad. Sci. U.S.A. 89, 1914-1918] where the benzo[a]pyrene ring is positioned in the minor groove without disruption of the Watson-Crick pairing at the [BP]dG.dC modification site. Thus, generation of the deletion site following removal of the dC opposite the (+)-trans-anti-[BP]dC results in a displacement of the entire [BP]dG residue toward the major groove and intercalation of the benzo[a]pyrene ring into the helix. C1 MEM SLOAN KETTERING CANC CTR,CELLULAR BIOCHEM & BIOPHYS PROGRAM,NEW YORK,NY 10021. OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831. AMER HLTH FDN,VALHALLA,NY 10595. NYU,DEPT CHEM,NEW YORK,NY 10003. NYU,DEPT BIOL,NEW YORK,NY 10003. RI Fiala, Radovan/D-8789-2012 FU NCI NIH HHS [CA-28038, CA-20851, CA-46533] NR 47 TC 58 Z9 58 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD SEP 27 PY 1994 VL 33 IS 38 BP 11507 EP 11517 DI 10.1021/bi00204a013 PG 11 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA PJ293 UT WOS:A1994PJ29300013 PM 7918364 ER PT J AU COSMAN, M FIALA, R HINGERTY, BE AMIN, S GEACINTOV, NE BROYDE, S PATEL, DJ AF COSMAN, M FIALA, R HINGERTY, BE AMIN, S GEACINTOV, NE BROYDE, S PATEL, DJ TI SOLUTION CONFORMATION OF THE (+)-CIS-ANTI-[BP]DG ADDUCT OPPOSITE A DELETION SITE IN A DNA DUPLEX - INTERCALATION OF THE COVALENTLY ATTACHED BENZO[A]PYRENE INTO THE HELIX WITH BASE DISPLACEMENT OF THE MODIFIED DEOXYGUANOSINE INTO THE MINOR-GROOVE SO BIOCHEMISTRY LA English DT Article ID ESCHERICHIA-COLI PLASMID; GUANINE PHOSPHORIBOSYLTRANSFERASE GENE; DOSE-DEPENDENT DIFFERENCES; SHUTTLE VECTOR; CODING REGION; DIOL EPOXIDE; MAJOR ADDUCT; HUMAN-CELLS; HOT-SPOT; MUTATIONS AB We have applied a combined NMR-molecular mechanics approach to determine the solution structure of the (+)-cis-anti-[BP]dG adduct positioned opposite a deletion site in the sequence d(C5-[BP]G6-C7).d(G16-G17) at the DNA oligomer duplex level. Our structural studies establish that the benzo[a]pyrene ring intercalates into the helix opposite the deletion site while the modified deoxyguanosine is displaced into the minor groove with its plane parallel to the helix axis. The intercalation site is wedge-shaped with the benzo[a]pyrene ring stacked over intact flanking Watson-Crick dG.dC base pairs. The modified deoxyguanosine stacks over the minor groove face of the sugar ring of the 5'-flanking dC5 residue. The structure at the lesion site is consistent with the observed intermolecular NOEs which served as input restraints to guide the molecular mechanics calculations, and, in addition, the various stacking interactions explain the observed large ring current shifts associated with adduct formation. The solution structure of the (+)-cis-anti-[BP]dG adduct positioned opposite a deletion site reported in this study is similar to the corresponding structure of the same adduct positioned opposite dC reported previously [Cosman, M., de los Santos, C., Fiala, R., Hingerty, B.E., Luna, E., Harvey, R.G., Geacintov, N.E., Broyde, S., & Patel, D.J. (1993) Biochemsitry 32, 4145-4155]. This is not surprising since the dC opposite the lesion site was looped out of the helix and it can be readily replaced by a deletion site through minor changes associated with buckling of the intercalation site. By contrast, the solution structures of the (+)-trans-anti-[BP]dG and (+)-cis-anti-[BP]dG adducts positioned opposite deletion sites in the same sequence context exhibit distinct surface topologies in the grooves of the DNA helix. Thus, even though the benzo[a]pyrene intercalates into the helix opposite the deletion site in both cases, the modified deoxyguanosine is displaced into the major groove for the (+)-trans-anti-[BP]dG adduct while it is displaced into the minor groove for the (+)-cis-anti-[BP]dG stereoisomer. The orientational differences reflect the chiral characteristics of the two [BP]-dG stereoisomeric adducts with the different alignments of the bulky DNA lesion opposite the deletion site likely to influence interactions with the cellular repair machinery. a C1 MEM SLOAN KETTERING CANC CTR,CELLULAR BIOCHEM & BIOPHYS PROGRAM,NEW YORK,NY 10021. OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831. AMER HLTH FDN,VALHALLA,NY 10595. NYU,DEPT CHEM,NEW YORK,NY 10003. NYU,DEPT BIOL,NEW YORK,NY 10003. RI Fiala, Radovan/D-8789-2012 FU NCI NIH HHS [CA-20851, CA-28038, CA-46533] NR 34 TC 53 Z9 53 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD SEP 27 PY 1994 VL 33 IS 38 BP 11518 EP 11527 DI 10.1021/bi00204a014 PG 10 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA PJ293 UT WOS:A1994PJ29300014 PM 7918365 ER PT J AU OZBAY, E MICHEL, E TUTTLE, G BISWAS, R HO, KM BOSTAK, J BLOOM, DM AF OZBAY, E MICHEL, E TUTTLE, G BISWAS, R HO, KM BOSTAK, J BLOOM, DM TI DOUBLE-ETCH GEOMETRY FOR MILLIMETER-WAVE PHOTONIC BAND-GAP CRYSTALS SO APPLIED PHYSICS LETTERS LA English DT Article AB We have designed and developed a new double-etch technique for fabricating three-dimensional millimeter-wave photonic band-gap crystals. This technique doubles the band-gap frequency obtainable from silicon wafers. By introducing overetching, the double-etch geometry allows one-way tuning of the midgap frequency. We have experimentally demonstrated this property by fabricating and testing structures with different overetch ratios. Terahertz spectroscopy techniques were used to measure photonic band-gap crystals with midgap frequencies ranging from 340 to 375 GHz. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. STANFORD UNIV,EDWARD L GINZTON LAB,STANFORD,CA 94305. RP OZBAY, E (reprint author), IOWA STATE UNIV SCI & TECHNOL,MICROELECTR RES CTR,AMES,IA 50011, USA. RI Ozbay, Ekmel/B-9495-2008 NR 11 TC 45 Z9 45 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 26 PY 1994 VL 65 IS 13 BP 1617 EP 1619 PG 3 WC Physics, Applied SC Physics GA PH332 UT WOS:A1994PH33200005 ER PT J AU HE, Y ELMASRY, NA RAMDANI, J BEDAIR, SM MCCORMICK, TL NEMANICH, RJ WEBER, ER AF HE, Y ELMASRY, NA RAMDANI, J BEDAIR, SM MCCORMICK, TL NEMANICH, RJ WEBER, ER TI DETERMINATION OF EXCESS PHOSPHORUS IN LOW-TEMPERATURE GAP GROWN BY GAS-SOURCE MOLECULAR-BEAM EPITAXY SO APPLIED PHYSICS LETTERS LA English DT Article ID GAAS-MESFETS; BREAKDOWN; DEFECTS; LAYERS; MBE AB GaP films, epitaxially grown at a low temperature (LT) of similar to 200 degrees C by gas source molecular beam epitaxy, were reported recently to have excess phosphorus. In this letter, we report on the quantitative determination of the excess phosphorus in the LT films, using various approaches. Analytical scanning transmission electron microscopy, double-crystal x-ray diffraction, and particle-induced x-ray emission showed that the LT GaP films incorporated excess phosphorus of similar to 0.6-2 at. %. The amount of excess phosphorus estimated from Raman scattering measurements, using the LO-TO phonon frequency splitting data of the as-grown LT GaP and bulk GaP, was in general agreement with those obtained from other techniques. C1 N CAROLINA STATE UNIV,DEPT ELECT & COMP ENGN,RALEIGH,NC 27695. N CAROLINA STATE UNIV,DEPT PHYS,RALEIGH,NC 27695. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP HE, Y (reprint author), N CAROLINA STATE UNIV,DEPT MAT SCI & ENGN,BOX 7907,RALEIGH,NC 27695, USA. NR 9 TC 7 Z9 7 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 26 PY 1994 VL 65 IS 13 BP 1671 EP 1673 DI 10.1063/1.112881 PG 3 WC Physics, Applied SC Physics GA PH332 UT WOS:A1994PH33200023 ER PT J AU LIN, XW WASHBURN, J LILIENTALWEBER, Z WEBER, ER SASAKI, A WAKAHARA, A NABETANI, Y AF LIN, XW WASHBURN, J LILIENTALWEBER, Z WEBER, ER SASAKI, A WAKAHARA, A NABETANI, Y TI MORPHOLOGICAL TRANSITION OF INAS ISLANDS ON GAAS(001) UPON DEPOSITION OF A GAAS CAPPING LAYER SO APPLIED PHYSICS LETTERS LA English DT Article ID MOLECULAR-BEAM EPITAXY; SURFACE SEGREGATION; GROWTH; ATOMS; REPLACEMENT; INGAAS AB The interaction between a GaAs cap and InAs islands grown on vicinal GaAs(001) has been studied by transmission electron microscopy and atomic force microscopy. Samples were prepared by molecular beam epitaxy at 480 degrees C. Upon GaAs cap deposition, it was found that the previously grown InAs islands undergo a novel type of morphological transition, i.e., a transition from disk-shaped to ring-shaped islands. InAs becomes depleted or entirely absent in the central area of what had been a disk-shaped InAs island. The GaAs cap was also shown to be virtually absent within the same central region, resulting in the formation of crater-like surface depressions. C1 KYOTO UNIV,DEPT ELECT ENGN,KYOTO 60601,JAPAN. RP LIN, XW (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Liliental-Weber, Zuzanna/H-8006-2012 NR 15 TC 33 Z9 33 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 26 PY 1994 VL 65 IS 13 BP 1677 EP 1679 DI 10.1063/1.112883 PG 3 WC Physics, Applied SC Physics GA PH332 UT WOS:A1994PH33200025 ER PT J AU KRAMER, KJ TALWAR, S SIGMON, TW WEINER, KH AF KRAMER, KJ TALWAR, S SIGMON, TW WEINER, KH TI HETEROEPITAXIAL SI SI1-XGEX SI STRUCTURES PRODUCED USING PULSED UV-LASER PROCESSING SO APPLIED PHYSICS LETTERS LA English DT Article ID HETEROJUNCTION BIPOLAR-TRANSISTORS; MOLECULAR-BEAM EPITAXY; LAYERS AB High quality heteroepitaxial regrowth of arsenic-implanted a-Si on Si1-xGex layers with Ge fractions between 0 and 0.2 is accomplished using pulsed laser induced epitaxy (PLIE). The structures of boron-doped Si1-xGex on Si(100) are created beforehand using a combination of (PLIE) and gas immersion laser doping. A small amount of Ge and B backdiffusion from the Si1-xGex film into the top Si layer is observed. During the laser pulse, the implanted arsenic diffuses up to the maximum melt depth so that melt depth and junction depth coincide. The a-Si is sputter deposited to a thickness of 900 Angstrom, and the As is implanted to a dose of 5x10(14) cm(-2) at 40 keV. A single XeCl excimer laser pulse with an energy fluence to be selected between 0.6 and 0.8 J/cm(2) is sufficient to heteroepitaxially regrow the a-Si and activate the implanted arsenic. C1 STANFORD UNIV,DEPT ELECT ENGN,STANFORD,CA 94305. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP KRAMER, KJ (reprint author), STANFORD UNIV,STANFORD ELECTR LABS,STANFORD,CA 94305, USA. NR 11 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 26 PY 1994 VL 65 IS 13 BP 1709 EP 1711 DI 10.1063/1.112893 PG 3 WC Physics, Applied SC Physics GA PH332 UT WOS:A1994PH33200036 ER PT J AU HINO, T SONG, YH PRAUSNITZ, JM AF HINO, T SONG, YH PRAUSNITZ, JM TI LIQUID-LIQUID EQUILIBRIA FOR COPOLYMER MIXTURES FROM A PERTURBED HARD-SPHERE-CHAIN EQUATION OF STATE SO MACROMOLECULES LA English DT Article ID INTERACTION PARAMETERS; SYSTEMS; BLENDS; MISCIBILITY; THERMODYNAMICS; POLYCARBONATES; POLYSTYRENE AB A perturbed hard-sphere-chain (PHSC) equation of state for real copolymer mixtures is based on a modified form of Chiew's equation of state for athermal mixtures of heteronuclear hard-sphere chains. The PHSC equation of state includes a van der Waals perturbation whose parameters are related to the intermolecular potential as suggested by Song and Mason. In the present model, sequence distribution in a polymer is introduced only into the hard-sphere-chain reference state; attractive forces are averaged, independent of sequence distribution. Theoretical coexistence curves and miscibility maps were computed for binary random copolymer mixtures containing two or three kinds of segments. The PHSC equation of state can predict simultaneous occurrence of a lower critical solution temperature and an upper critical solution temperature in the temperature-composition phase diagram of high-molecular-weight copolymer blends. Theoretical and experimental coexistence curves and miscibility maps show good agreement for systems containing two kinds of segments. C1 UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. NR 25 TC 29 Z9 31 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD SEP 26 PY 1994 VL 27 IS 20 BP 5681 EP 5690 DI 10.1021/ma00098a023 PG 10 WC Polymer Science SC Polymer Science GA PJ324 UT WOS:A1994PJ32400023 ER PT J AU ROSENAU, P AF ROSENAU, P TI NONLINEAR DISPERSION AND COMPACT STRUCTURES SO PHYSICAL REVIEW LETTERS LA English DT Article ID SOLITONS; DYNAMICS AB Relaxing the distinguished ordering underlying the derivation of soliton supporting equations leads to new equations endowed with nonlinear dispersion crucial for the formation and coexistence of compactons, solitons with a compact support, and conventional solitons. Vibrations of-the anharmonic mass-spring chain lead to a new Boussinesq equation admitting compactons and compact breathers. The model equation u(t) + [delta u + 3 gamma u(2)/2 + u(1-omega)(u(omega)u(x))(x)](x) + nu u(txx) = 0 (omega, nu, delta, gamma const) admits compactons and for 2 omega = nu gamma = 1 has a bi-Hamiltonian structure. The infinite sequence of commuting flows generates an integrable, compacton's supporting variant of the Harry Dym equation. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP ROSENAU, P (reprint author), TECHNION ISRAEL INST TECHNOL,IL-32000 HAIFA,ISRAEL. NR 13 TC 232 Z9 234 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 SEP 26 PY 1994 VL 73 IS 13 BP 1737 EP 1741 DI 10.1103/PhysRevLett.73.1737 PG 5 WC Physics, Multidisciplinary SC Physics GA PH256 UT WOS:A1994PH25600001 ER PT J AU ALTES, CPK LEE, KY PISARSKI, RD AF ALTES, CPK LEE, KY PISARSKI, RD TI PHASE OF THE WILSON LINE AT HIGH-TEMPERATURE IN THE STANDARD MODEL SO PHYSICAL REVIEW LETTERS LA English DT Article ID SU(N) GAUGE-THEORY; FINITE-TEMPERATURE; FALSE VACUUM; INTERFACE TENSION; ORDER PARAMETER; QCD; FATE AB We compute the effective potential for the phase of the Wilson line at high temperature in the standard model to one-loop order. Besides the trivial vacua, there are metastable states in the direction of U(1) hypercharge. Assuming that the Universe starts out in such a metastable state at the Planck scale, it easily persists to the time of the electroweak phase transition, which then proceeds by an unusual mechanism. All remnants of the metastable state evaporate about the time of the QCD phase transition. C1 COLUMBIA UNIV,DEPT PHYS,NEW YORK,NY 10027. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP ALTES, CPK (reprint author), CNRS,CTR PHYS THEOR,BP 907,F-13288 MARSEILLE,FRANCE. RI Lee, Kimyeong/K-1070-2013 OI Lee, Kimyeong/0000-0003-3451-1514 NR 33 TC 17 Z9 18 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 SEP 26 PY 1994 VL 73 IS 13 BP 1754 EP 1757 DI 10.1103/PhysRevLett.73.1754 PG 4 WC Physics, Multidisciplinary SC Physics GA PH256 UT WOS:A1994PH25600005 ER PT J AU KRAUS, G EGELHOF, P FISCHER, C GEISSEL, H HIMMLER, A NICKEL, F MUNZENBERG, G SCHWAB, W WEISS, A FRIESE, J GILLITZER, A KORNER, HJ PETER, M HENNING, WF SCHIFFER, JP KRATZ, JV CHULKOV, L GOLOVKOV, M OGLOBLIN, A BROWN, BA AF KRAUS, G EGELHOF, P FISCHER, C GEISSEL, H HIMMLER, A NICKEL, F MUNZENBERG, G SCHWAB, W WEISS, A FRIESE, J GILLITZER, A KORNER, HJ PETER, M HENNING, WF SCHIFFER, JP KRATZ, JV CHULKOV, L GOLOVKOV, M OGLOBLIN, A BROWN, BA TI PROTON INELASTIC-SCATTERING ON NI-56 IN INVERSE KINEMATICS SO PHYSICAL REVIEW LETTERS LA English DT Article ID SHELL AB Inelastic proton scattering to the first excited 2(+) state of the doubly magic Ni-56 nucleus was investigated in inverse kinematics, using a secondary beam of radioactive Ni-56 nuclei. At an incident energy of 101 MeV/nucleon, a value B(E2, 0(+) --> 2(+)) = 600 +/- 120 e(2) fm(4) was measured. This result completes the set of experimental data for the first excited 2(+) states in the 1f-2p shell with a closed shell of neutrons or protons. These data are compared to recent shell-model calculations. C1 TECH UNIV MUNICH,D-85748 GARCHING,GERMANY. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV MAINZ,D-55099 MAINZ,GERMANY. IV KURCHATOV ATOM ENERGY INST,MOSCOW 123182,RUSSIA. MICHIGAN STATE UNIV,E LANSING,MI 48824. RP KRAUS, G (reprint author), GESELL SCHWERIONENFORSCH MBH,D-64220 DARMSTADT,GERMANY. NR 10 TC 102 Z9 102 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 26 PY 1994 VL 73 IS 13 BP 1773 EP 1776 DI 10.1103/PhysRevLett.73.1773 PG 4 WC Physics, Multidisciplinary SC Physics GA PH256 UT WOS:A1994PH25600010 ER PT J AU KELLOGG, GL AF KELLOGG, GL TI OSCILLATORY BEHAVIOR IN THE SIZE DEPENDENCE OF CLUSTER MOBILITY ON METAL-SURFACES - RH ON RH(100) SO PHYSICAL REVIEW LETTERS LA English DT Article ID PLATINUM ADATOM CLUSTERS; ATOM-METHOD CALCULATIONS; DIFFUSION; PT(001); DYNAMICS AB The mobility of Rh clusters containing two to twelve atoms adsorbed on the Rh(100) plane is examined by field ion microscopy. The activation energy of surface diffusion exhibits an interesting, oscillatory behavior as a function of cluster size. Compact geometric structures (squares and rectangles) have a consistently higher activation energy than structures with extra atoms at the periphery. The atomic-level mechanism involved in cluster diffusion is inferred from a comparison of the measured activation energies to previous theoretical calculations. RP SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. NR 23 TC 99 Z9 101 U1 1 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 26 PY 1994 VL 73 IS 13 BP 1833 EP 1836 DI 10.1103/PhysRevLett.73.1833 PG 4 WC Physics, Multidisciplinary SC Physics GA PH256 UT WOS:A1994PH25600025 ER PT J AU DOBACZEWSKI, J NAZAREWICZ, W AF DOBACZEWSKI, J NAZAREWICZ, W TI SHELL EFFECTS IN NUCLEI NEAR THE NEUTRON-DRIP LINE - COMMENT SO PHYSICAL REVIEW LETTERS LA English DT Note C1 OAK RIDGE NATL LAB,DIV PHYS,JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. RP DOBACZEWSKI, J (reprint author), UNIV WARSAW,INST THEORET PHYS,HOZA 69,PL-00681 WARSAW,POLAND. RI Ring, Peter/O-1638-2015 NR 9 TC 12 Z9 12 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 26 PY 1994 VL 73 IS 13 BP 1869 EP 1869 DI 10.1103/PhysRevLett.73.1869 PG 1 WC Physics, Multidisciplinary SC Physics GA PH256 UT WOS:A1994PH25600034 ER PT J AU KLEMM, RA AF KLEMM, RA TI EXPERIMENTAL-DETERMINATION OF THE SUPERCONDUCTING PAIRING STATE IN YBCO FROM THE PHASE COHERENCE OF YBCO-PB DC SQUIDS - COMMENT SO PHYSICAL REVIEW LETTERS LA English DT Note RP KLEMM, RA (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 10 TC 29 Z9 29 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 26 PY 1994 VL 73 IS 13 BP 1871 EP 1871 DI 10.1103/PhysRevLett.73.1871 PG 1 WC Physics, Multidisciplinary SC Physics GA PH256 UT WOS:A1994PH25600036 ER PT J AU FENG, JQ BASARAN, OA AF FENG, JQ BASARAN, OA TI SHEAR-FLOW OVER A TRANSLATIONALLY SYMMETRICAL CYLINDRICAL BUBBLE PINNED ON A SLOT IN A PLANE WALL SO JOURNAL OF FLUID MECHANICS LA English DT Article ID NAVIER-STOKES EQUATIONS; BOUNDARY-PROBLEMS; FLUID-MECHANICS; LIQUID; SURFACE; DROPS; DEFORMATION; STABILITY; FIELDS AB Steady states of a translationally-symmetric cylindrical bubble protruding from a slot in a solid wall into a liquid undergoing a simple shear flow are investigated. Deformations of and the flow past the bubble are determined by solving the nonlinear free-boundary problem comprised of the two-dimensional Navier-Stokes system by the Galerkin/finite element method. Under conditions of creeping flow, the results of finite element computations are shown to agree well with asymptotic results. When the Reynolds number lie is finite, flow separates from the free surface and a recirculating eddy forms behind the bubble. The length of the separated eddy measured in the flow direction increases with Re, whereas its width is confined to within the region that lies between the supporting solid surface and the separation point at the free surface. By tracking solution branches in parameter space with an are-length continuation method, curves of bubble deformation versus Reynolds number are found to exhibit turning points when Re reaches a critical value Re-c. Therefore, along a family of bubble shapes, solutions do not exist when Re > Re-c. The locations of turning points and the structure of flow fields are found to be governed virtually by a single parameter, We = Ca Re, where We and Ca are Weber and capillary numbers. Two markedly different modes of bubble deformation are identified at finite Re. One is dominant when Re is small and is tantamount to a plain skewing or tilting of the bubble in the downstream direction; the other becomes more pronounced when Re is large and corresponds to a pure upward stretching of the bubble tip. C1 UNIV TENNESSEE, DEPT CHEM ENGN, KNOXVILLE, TN 37996 USA. RP OAK RIDGE NATL LAB, DIV CHEM TECHNOL, OAK RIDGE, TN 37831 USA. NR 50 TC 36 Z9 37 U1 1 U2 7 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 SEP 25 PY 1994 VL 275 BP 351 EP 378 DI 10.1017/S0022112094002399 PG 28 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA PK571 UT WOS:A1994PK57100014 ER PT J AU BARNES, MD WHITTEN, WB RAMSEY, JM AF BARNES, MD WHITTEN, WB RAMSEY, JM TI PROBING FEMTOSECOND DYNAMICS IN SOLUTION ON A PICOSECOND TIME-SCALE - CAVITY ENHANCEMENT OF SPONTANEOUS EMISSION RATES IN MICRODROPLETS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID INHIBITED SPONTANEOUS EMISSION; DIELECTRIC MICROSPHERES; ROOM-TEMPERATURE; OPTICAL CAVITIES; MOLECULES; RHODAMINE-6G; SUPPRESSION; RESONANCES; DECAY; ATOMS AB Fluorescence decay rate enhancement of rhodamine 6G (R6G) in levitated ethylene glycol microdroplets (4-8 mum diam.) has been observed. This effect derives from an increase (relative to extended media) in electromagnetic mode density near resonance frequencies associated with the droplet. Unlike bulk solutions, fluorescence lifetimes (T1) in microcavities carry information on electronic polarization dephasing (T2) on a femtosecond time scale. Thus, femtosecond dynamics can be probed indirectly via fluorescence with a time resolution of several picoseconds. The value of T2 in ethylene glycol estimated from our measurements agrees well with values obtained from direct femtosecond probes. RP BARNES, MD (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,POB 2008,OAK RIDGE,TN 37831, USA. NR 27 TC 16 Z9 16 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD SEP 23 PY 1994 VL 227 IS 6 BP 628 EP 632 DI 10.1016/0009-2614(94)00872-8 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PG982 UT WOS:A1994PG98200015 ER PT J AU MCCORMACK, EF PRATT, ST DEHMER, PM DEHMER, JL AF MCCORMACK, EF PRATT, ST DEHMER, PM DEHMER, JL TI OBSERVATION OF HYPERFINE QUANTUM BEATS IN 2-COLOR LASER-INDUCED GRATING SPECTROSCOPY OF NITRIC-OXIDE SO CHEMICAL PHYSICS LETTERS LA English DT Article ID ROTATIONAL LINE STRENGTHS; DECOMPOSITION METHOD; EXCITED-STATES; FREE JETS; TRANSIENT; DYNAMICS; NO; RESOLUTION AB Two-color laser-induced grating spectroscopy of NO via the A 2SIGMA+, nu' = 0 state has been used to study the time evolution of population gratings produced in a supersonic molecular beam. For a specific polarization configuration of the input laser beams, quantum beats due to the hyperfine structure of the A 2SIGMA+, nu' = 0 state have been observed by varying the delay between the grating-forming laser pulses and the grating-probing laser pulse. This form of quantum beat spectroscopy has the advantages of background-free detection, two-color state selectivity, a quadratic dependence on the level population, and a beat signal independent of the decay mode. RP MCCORMACK, EF (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 36 TC 20 Z9 20 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD SEP 23 PY 1994 VL 227 IS 6 BP 656 EP 662 DI 10.1016/0009-2614(94)00875-2 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PG982 UT WOS:A1994PG98200020 ER PT J AU LEVIN, S ABULAFI, S GOLSHANSHIRAZI, S GUIOCHON, G AF LEVIN, S ABULAFI, S GOLSHANSHIRAZI, S GUIOCHON, G TI USE OF SYSTEM PEAKS FOR THE DETERMINATION OF THE DISTRIBUTION OF RESORCINOL, CATECHOL AND PHENOL IN LIQUID-CHROMATOGRAPHY SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article ID COMPONENTS; RETENTION AB The single-component adsorption isotherms of resorcinol, catechol and phenol between aqueous solutions and LiChrosorb RP-18 were determined using the system peaks of these components. The single-component isotherms obtained agree well with those derived by frontal analysis. For multi-component solutions at low concentrations, the system peaks obtained are the combination of those observed for the different single-component systems (linear range). When the concentration increases, the retention times and the areas of the different system peaks depend on the nature and concentration of all the system components (non-linear range). The experimental results agree well with the results predicted using the Langmuir competitive isotherms derived from the single-component isotherms. The dependence of the system peak areas on these concentrations is especially complex. The experimental results agree well, however, with those of calculations based on the use of the equilibrium-dispersive model. C1 AAI,WILMINGTON,NC. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37863. RP LEVIN, S (reprint author), HEBREW UNIV JERUSALEM,SCH PHARM,IL-91120 JERUSALEM,ISRAEL. NR 19 TC 7 Z9 7 U1 2 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD SEP 23 PY 1994 VL 679 IS 2 BP 213 EP 229 DI 10.1016/0021-9673(94)80564-4 PG 17 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA PJ681 UT WOS:A1994PJ68100001 ER PT J AU FARKAS, T CHAMBERS, JQ GUIOCHON, G AF FARKAS, T CHAMBERS, JQ GUIOCHON, G TI COLUMN EFFICIENCY AND RADIAL HOMOGENEITY IN LIQUID-CHROMATOGRAPHY SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article ID DIAMETER AB Local, on-column electrochemical detection was carried out in the amperometric mode at different points of the column outlet cross-section. This permitted the determination of the spatial distribution of analyte molecules within the chromatographic zone at the column exit. The radial distribution of the peak-maximum velocity, the local efficiency and the analyte concentration were determined for a commercial column and for several laboratory-packed columns made with different solid particles and with a commercial silica-based stationary phase. An important region of the packing close to the wall is denser, has a lower permeability and a lower efficiency than the core of the packing. The concentration along the wall is lower than average, in part because of the lower efficiency. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 12 TC 69 Z9 70 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD SEP 23 PY 1994 VL 679 IS 2 BP 231 EP 245 DI 10.1016/0021-9673(94)80565-2 PG 15 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA PJ681 UT WOS:A1994PJ68100002 ER PT J AU EIDEN, GC GARRETT, AW CISPER, ME NOGAR, NS HEMBERGER, PH AF EIDEN, GC GARRETT, AW CISPER, ME NOGAR, NS HEMBERGER, PH TI AN IMPROVED METHOD FOR CAPTURING LASER-DESORBED IONS IN AN ION-TRAP MASS-SPECTROMETER - DYNAMIC R.F. TRAPPING SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES LA English DT Article DE DYNAMIC TRAPPING; ION INJECTION; ION TRAP; LASER DESORPTION; MASS SPECTROMETRY ID INJECTED EXTERNAL IONS; DESORPTION IONIZATION; CLUSTER IONS; PHOTODISSOCIATION; DISSOCIATION; STORAGE; SPECTROSCOPY; CONFINEMENT; SIMULATION; PROTEINS AB We have developed an improved method, dynamic r.f. trapping, for capturing laser desorbed ions in a quadrupole ion trap mass spectrometer (ITMS). Trapping efficiency is enhanced by over an order of magnitude over previous methods. A 308 nm excimer laser pulse desorbs the sample - trimethylphenylammonium iodide (TPA-I) is used in most of the work reported - from a probe inserted through the ring electrode. The laser is fired as the r.f. trapping potential (risetime about 175 mu s) is applied to the ring electrode. Laser desorbed ions penetrate the trap while the trapping potential is low, but cannot escape because the r.f. potential rises substantially during their transit across the trap. The trapping efficiency is found to depend critically on the kinetic energy of the laser desorbed ions, and on the r.f. amplitude, phase, and rate of change of the r.f. amplitude when the laser fires. Cation and anion signals are recorded as functions of coarse and fine steps in the laser-to-r.f. timing. Coarse and fine timing steps test the effects of laser-to-r.f. delay and phase respectively. We also report effects on trapping efficiency of buffer gas pressure and composition (He neat versus He:Xe mixtures) and the amplitude of the ring electrode steady state r.f. potential. The delay and phase dependence of the experimental data is analyzed with reference to an effective potential barrier model. Differences in the phase and delay dependences for anions and cations are attributed to differences in Debye shielding early in the expansion of the laser desorbed plume. Cation and anion mass spectra are presented for laser desorption/ionization of TPA-I and pyrene. For TPA-I desorption, reactions between laser desorbed cations and neutral TPA fragments in the early, high density portion of the laser plume lead to production of high mass cations. C1 LOS ALAMOS NATL LAB,DIV CHEM SCI & TECHNOL,LOS ALAMOS,NM 87545. NR 58 TC 21 Z9 21 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1176 J9 INT J MASS SPECTROM JI Int. J. Mass Spectrom. Ion Process. PD SEP 22 PY 1994 VL 136 IS 2-3 BP 119 EP 141 DI 10.1016/0168-1176(94)04013-3 PG 23 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA PN773 UT WOS:A1994PN77300002 ER PT J AU BOWERS, CR PIETRASS, T BARASH, E PINES, A GRUBBS, RK ALIVISATOS, AP AF BOWERS, CR PIETRASS, T BARASH, E PINES, A GRUBBS, RK ALIVISATOS, AP TI PROBING CDS NANOCRYSTAL SURFACES WITH LASER-POLARIZED XENON SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID 2-DIMENSIONAL NMR-SPECTROSCOPY; XE-129 NMR; CROSS-POLARIZATION; MOLECULAR-SIEVES; POLYMER SURFACE; FIELD; CRYSTALLITES; RESONANCE AB This paper describes the application of optically pumped xenon NMR to probe the surface of semiconductor nanocrystals by physisorption at 123 K. These experiments were made possible by using highly spin ordered Xe-129, prepared by optical pumping and spin exchange of a rubidium xenon gas mixture, to increase the NMR signal strength. CdS nanocrystals were prepared by regulated growth in inverse micelles and precipitated by surface derivatization with thiophenol. Nanocrystals of 11.8, 12.8, and 23 Angstrom radii with 26%, 63%, and 57% thiophenol surface coverage, respectively, were characterized. Within this sample parameter space, the Xe-129 spectra, recorded at varying xenon coverages, depended strongly on thiophenol surface coverage but were not sensitive to the crystallite size. In addition, the nanocrystals with low thiophenol coverage yielded a xenon line shape consisting of two components, interpreted as xenon signals arising from distinct surface domains. These domains are presumably formed by the aggregation of thiophenol molecules on the nanocrystal surface when the thiophenol coverage is incomplete, a model which is consistent with existing X-ray photoelectron spectroscopy and liquid state H-1 NMR data. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI Alivisatos , Paul /N-8863-2015 OI Alivisatos , Paul /0000-0001-6895-9048 NR 29 TC 35 Z9 35 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 SEP 22 PY 1994 VL 98 IS 38 BP 9400 EP 9404 DI 10.1021/j100089a008 PG 5 WC Chemistry, Physical SC Chemistry GA PH559 UT WOS:A1994PH55900008 ER PT J AU CHEN, LX BOWMAN, MK WANG, ZY MONTANO, PA NORRIS, JR AF CHEN, LX BOWMAN, MK WANG, ZY MONTANO, PA NORRIS, JR TI STRUCTURAL STUDIES OF PHOTOINDUCED INTRAMOLECULAR ELECTRON-TRANSFER IN CYCLOPENTADIENYLNITROSYLNICKEL SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID X-RAY-ABSORPTION; FINE-STRUCTURE; CARBOXYMYOGLOBIN; EXAFS AB A structural study based on EXAFS, FTIR, and optical absorption spectroscopies has been conducted on; a photogenerated, metastable state of cyclopentadienylnitrosylnickel (CpNiNO) produced by a reversible photochemical reaction. The photogenerated, metastable state with distinctively different EXAFS, FTIR, and optical absorption spectra from those of the ground state was created by irradiating the sample at 20 K with the 365-nm line of a mercury lamp. At the same temperature, the reverse reaction was induced by irradiation with the 313-nm line from a mercury lamp. On the basis of the analysis of the EXAFS data, the photogenerated, metastable state of CpNiNO has undergone considerable nuclear rearrangements cmopared to its ground state. The nuclear movement is characterized by a 0.12-Angstrom elongation of the Ni-N bond and by a bending of the Ni-N-O. A shift of the N-O stretching frequency from 1824 to 1387 cm(-1) was observed in the photoinduced reaction with 365-nm Light, consistent with previous studies. This implies that a NO- like species results from intramolecular electron transfer from Ni to NO. The absorption spectrum of the long-lived, metastable, charge-transfer state exhibited reduced absorption of the 385-nm band and an additional broad band in the near-IR region, which is likely a consequence of the intramolecular electron transfer and the Ni-N-O bending. On the basis of the structures obtained from EXAFS, ZINDO calculations for the ground state of CpNiNO reproduced the general features of the observed absorption spectrum and were qualitatively consistent with the complicated dependence of the charge-transfer photoreaction on wavelength. C1 PACIFIC NW LAB, RICHLAND, WA 99353 USA. UNIV CHICAGO, DEPT CHEM, CHICAGO, IL 60637 USA. ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. UNIV ILLINOIS, DEPT PHYS, CHICAGO, IL 60680 USA. RP CHEN, LX (reprint author), ARGONNE NATL LAB, DIV CHEM, 9700 S CASS AVE, ARGONNE, IL 60439 USA. RI Bowman, Michael/F-4265-2011 OI Bowman, Michael/0000-0003-3464-9409 NR 17 TC 36 Z9 36 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD SEP 22 PY 1994 VL 98 IS 38 BP 9457 EP 9464 DI 10.1021/j100089a017 PG 8 WC Chemistry, Physical SC Chemistry GA PH559 UT WOS:A1994PH55900017 ER PT J AU LIU, AD SAUER, MC TRIFUNAC, AD AF LIU, AD SAUER, MC TRIFUNAC, AD TI PRODUCT YIELDS FROM MULTIPHOTON PROCESSES IN CYCLOHEXANE AND SOLUTIONS OF AROMATIC-COMPOUNDS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID HYDROCARBONS; PHOTOIONIZATION; IONIZATION; RADICALS; ALKANE AB Products from the 248 nm photolysis of neat cyclohexane are measured as a function of light intensity and total exposure. The yields of these products increase in proportion to the square of the incident intensity, indicating a biphotonic process, and the quantum yields are independent of the total incident light. The quantum yields (per two photons absorbed) are 0.6 +/- 0.1, 0.6 rt 0.1, and 0.04 rt 0.01, for H-2, cyclohexene, and bicyclohexyl, respectively. These quantum yields indicate that molecular decomposition (to H-2 and cyclohexene) of excited cyclohexane resulting from the geminate recombination of electron-solvent radical cation pairs created in the biphotonic ionization process accounts for more than 80% of the ions. For a given incident light intensity, the addition of an aromatic solute (anthracene, biphenyl, or acenaphthene) causes the amount of these products observed to increase, despite the fact that the light absorption by the solvent is markedly less. This indicates the occurrence of processes by which energy absorbed by an aromatic molecule results in decomposition of the cyclohexane. Evidence that this process is proton transfer from excited aromatic radical cations is discussed. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. NR 15 TC 8 Z9 8 U1 1 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 SEP 22 PY 1994 VL 98 IS 38 BP 9546 EP 9550 DI 10.1021/j100089a030 PG 5 WC Chemistry, Physical SC Chemistry GA PH559 UT WOS:A1994PH55900030 ER PT J AU LAWLESS, D KAPOOR, S KENNEPOHL, P MEISEL, D SERPONE, N AF LAWLESS, D KAPOOR, S KENNEPOHL, P MEISEL, D SERPONE, N TI REDUCTION AND AGGREGATION OF SILVER IONS AT THE SURFACE OF COLLOIDAL SILICA SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID SMALL METAL PARTICLES; AQUEOUS-SOLUTION; PHYSICOCHEMICAL PROPERTIES; AG+ IONS; CLUSTERS; ATOMS; CHEMISORPTION; CHEMISTRY; GROWTH AB The reduction of silver ions at the surface of 40 Angstrom colloidal silica particles at pH 9 has been studied using the pulse radiolysis technique. The rate of reaction of e(aq)(-) with Ag+ increases linearly with an increase in the Ag+/SiO2 ratio until a ratio of 12:1 is reached. At this loading the reaction becomes independent of the silver concentration at the particle surface. Ag-0 and Ag-2(+), the first products of silver ion reduction in aqueous solution, have been identified by their absorption spectra as the primary species formed by the reduction of silver ions at the surface of SiO2. Within the time window of the experiments (less than or equal to 200 mu s) there is no evidence of larger silver cluster formations (e.g., Ag-4(2+)) that are formed under identical conditions in the absence of silica. Evidently, the silica surface stabilizes the Ag-2(+) cation. Irradiation of Ag+/SiO2 solutions with trains of electron pulses leads to the formation of two small silver clusters exhibiting spectral bands at 290 and 330 nm and the conventional colloidal particle with its. band at similar to 400 nm.. These clusters are stable-in the presence of oxygen for at least several weeks. Addition of redox active and reducing agents confirmed that the three spectral bands originate from three different clusters. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. CONCORDIA UNIV,DEPT CHEM,MONTREAL H3G 1M8,PQ,CANADA. RI Kennepohl, Pierre/B-2096-2009 OI Kennepohl, Pierre/0000-0003-3408-9157 NR 23 TC 59 Z9 60 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD SEP 22 PY 1994 VL 98 IS 38 BP 9619 EP 9625 DI 10.1021/j100089a042 PG 7 WC Chemistry, Physical SC Chemistry GA PH559 UT WOS:A1994PH55900042 ER PT J AU GAI, HD GARRETT, BC AF GAI, HD GARRETT, BC TI PATH-INTEGRAL CALCULATIONS OF THE FREE-ENERGIES OF HYDRATION OF HYDROGEN ISOTOPES (H, D, AND MU) SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID BENZENE; SIMULATION; SOLVENT; ATOMS; WATER AB We have calculated the free energies of aqueous solvation of the hydrogen isotopes H, D, and Mu quantum mechanically, using path integral methods, to understand the effect of equilibrium solvation on the rate constants for the addition of hydrogen atom isotopes to benzene in aqueous solution. Within a classical mechanical model, the free energy of solvation of the hydrogenic solute is independent of its isotopic mass. However, when treated quantum mechanically, these solvation free energies can vary with solute isotopic mass. Our calculated Helmholtz free energies of solvation for the H and D isotopes are nearly the same, 2.53 +/- 0.31 and 2.44 +/- 0.29 kcal/mol, respectively, indicating that quantum effects on the solvation energetics are small for these systems. Similarly, our calculated Gibbs free energies of solvation for H and D are 3.23 +/- 0.32 and 3.29 +/- 0.35, respectively. The calculated free energy of solvation of H is in qualitative agreement with the experimental estimate. We have also calculated the Helmholtz and Gibbs free energies of solvation at 300 K for the light hydrogenic isotope muonium (Mu). (Muonium is a positive muon electron pair that behaves chemically like hydrogen but has one-ninth the mass.) The calculated Helmholtz and Gibbs free energies of solvation for Mu are much higher, about 3.83 +/- 0.71 and 4.23 +/- 1.23 kcal/mol, respectively. These values are used to evaluate the effect of equilibrium solvation on kinetic isotope effects for the addition reaction of hydrogen atom isotopes to benzene. If classical mechanics is used for this reaction, the change in the free energy of activation upon solvation is independent of the mass of the hydrogen atom isotope. Using our calculated free energy of solvation data, we conclude that the rate enhancement in solution compared to gas phase for hydrogen and deuterium atom addition to benzene is well described by equilibrium solvation. This argument does not apply to muonium, indicating that details of the solvent dynamics will be important for the reaction of muonium with benzene in aqueous solution. C1 PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RI Garrett, Bruce/F-8516-2011 NR 23 TC 22 Z9 22 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 SEP 22 PY 1994 VL 98 IS 38 BP 9642 EP 9648 DI 10.1021/j100089a045 PG 7 WC Chemistry, Physical SC Chemistry GA PH559 UT WOS:A1994PH55900045 ER PT J AU WOLDEGABRIEL, G WHITE, TD SUWA, G RENNE, P DEHEINZELIN, J HART, WK HEIKEN, G AF WOLDEGABRIEL, G WHITE, TD SUWA, G RENNE, P DEHEINZELIN, J HART, WK HEIKEN, G TI ECOLOGICAL AND TEMPORAL PLACEMENT OF EARLY PLIOCENE HOMINIDS AT ARAMIS, ETHIOPIA SO NATURE LA English DT Article ID MIDDLE-AWASH-VALLEY; STRATIGRAPHY; DISCOVERIES; HADAR; AFAR AB SEDIMENTARY deposits in the Middle Awash research area of Ethiopia's Afar depression have yielded vertebrate fossils including the most ancient hominids known. Radioisotopic dating, geochemical analysis of interbedded volcanic ashes and biochronological considerations place the hominid-bearing deposits at around 4.4 million years of age. Sedimentological, botanical and faunal evidence suggests a wooded habitat for the Aramis hominids. C1 UNIV CALIF BERKELEY,HUMAN EVOLUTIONARY STUDIES LAB,BERKELEY,CA 94720. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV TOKYO,DEPT ANTHROPOL,BUNKYO KU,TOKYO 113,JAPAN. BERKELEY GEOCHRONOL CTR,BERKELEY,CA 94709. INST ROYAL SCI NAT BELGIQUE,B-1040 BRUSSELS,BELGIUM. MIAMI UNIV,DEPT GEOL,OXFORD,OH 45056. NR 17 TC 180 Z9 187 U1 1 U2 9 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD SEP 22 PY 1994 VL 371 IS 6495 BP 330 EP 333 DI 10.1038/371330a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PH254 UT WOS:A1994PH25400051 PM 8090201 ER PT J AU SHANNON, JA PHILLIPS, WR DURELL, JL VARLEY, BJ URBAN, W PEARSON, CJ AHMAD, I LISTER, CJ MORSS, LR NASH, KL WILLIAMS, CW SCHULZ, N LUBKIEWICZ, E BENTALEB, M AF SHANNON, JA PHILLIPS, WR DURELL, JL VARLEY, BJ URBAN, W PEARSON, CJ AHMAD, I LISTER, CJ MORSS, LR NASH, KL WILLIAMS, CW SCHULZ, N LUBKIEWICZ, E BENTALEB, M TI THE ROLE OF TRIAXIALITY IN THE GROUND-STATES OF EVEN-EVEN NEUTRON-RICH RU ISOTOPES SO PHYSICS LETTERS B LA English DT Article ID INTERACTING BOSON MODEL; COLLECTIVE STRUCTURE; NUCLEI; REGION AB Partial decay schemes for the very neutron-rich nuclei 108,110,112Ru and 114Ru, about which nothing was previously known, have been determined from the study of prompt, triple-gamma coincidences in 248Cm fission fragments. Levels with probable spin up to 10HBAR have been observed and gamma-ray branching ratios obtained. Ratios of reduced electric quadrupole transition probabilities obtained from the branching ratios are in good agreement with predictions of a simple model of a rigid triaxial rotor. C1 UNIV LOUIS PASTEUR,CTR RES NUCL,CNRS,IN2P3,F-67037 STRASBOURG,FRANCE. ARGONNE NATL LAB,ARGONNE,IL 60439. RP SHANNON, JA (reprint author), UNIV MANCHESTER,DEPT PHYS & ASTRON,MANCHESTER M13 9PL,LANCS,ENGLAND. NR 23 TC 96 Z9 98 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD SEP 22 PY 1994 VL 336 IS 2 BP 136 EP 140 DI 10.1016/0370-2693(94)90238-0 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PG959 UT WOS:A1994PG95900002 ER PT J AU MURAYAMA, H KAPLAN, DB AF MURAYAMA, H KAPLAN, DB TI FAMILY SYMMETRIES AND PROTON DECAY SO PHYSICS LETTERS B LA English DT Article ID STANDARD MODEL; BARYON AB The proton decay modes p --> K0e+ and p --> K0mu+ may be visible in certain supersymmetric theories, and if seen would provide evidence for new flavor physics at extremely short distances. These decay modes can arise from the dimension five operator (Q1Q1Q2L1,2), where Q(i) and L(i) are i(th) generation quark and lepton superfields respectively. Such an operator is not generated at observable levels due to gauge or Higgs boson exchange in a minimal GUT. However in theories that explain the fermion mass hierarchy, it may be generated at the Planck scale with a strength such that the decays p --> K0l+ are both compatible with the proton lifetime and visible at Super-Kamiokande. Observable proton decay can even occur in theories without unification. C1 UNIV WASHINGTON,INST NUCL THEORY HN-12,SEATTLE,WA 98195. UNIV CALIF SANTA BARBARA,INST THEORET PHYS,SANTA BARBARA,CA 93106. RP MURAYAMA, H (reprint author), LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720, USA. RI Murayama, Hitoshi/A-4286-2011 NR 19 TC 42 Z9 42 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 SEP 22 PY 1994 VL 336 IS 2 BP 221 EP 228 DI 10.1016/0370-2693(94)90242-9 PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PG959 UT WOS:A1994PG95900016 ER PT J AU ADAMS, DL AKCHURIN, N BELIKOV, NI BRAVAR, A BYSTRICKY, J CHAUMETTE, P CORCORAN, MD COSSAIRT, JD CRANSHAW, J DEREGEL, J DEREVSCHIKOV, AA DURAND, G ENYO, H FABRE, J FUKUDA, K FUNAHASHI, H GOTO, Y GRACHOV, OA GROSNICK, DP HILL, DA IIJIMA, T IMAI, K ITOW, Y IWATANI, K KASPRZYK, T KRUEGER, KW KURODA, K LAGHAI, M LEHAR, F DELESQUEN, A LOPIANO, D LUEHRING, FC MAKI, T MAKINO, S MASAIKE, A MATULENKO, YA MESCHANIN, AP MICHALOWICZ, A MILLER, DH MIYAKE, K NAGAMINE, T NESSITEDALDI, F NESSI, M NGUYEN, C NURUSHEV, SB OHASHI, Y ONEL, Y PATALAKHA, DI PAULETTA, G PENZO, A READ, AL ROBERTS, JB VANROSSUM, L RYKOV, VL SAITO, N SALVATO, G SCHIAVON, P SHEPARD, J SKEENS, J SOLOVYANOV, VL SPINKA, H TAKASHIMA, R TAKEUTCHI, F TAMURA, N TANAKA, N UNDERWOOD, DG VASILIEV, AN VILLARI, A WHITE, JL YAMASHITA, S YOKOSAWA, A YOSHIDA, T ZANETTI, A AF ADAMS, DL AKCHURIN, N BELIKOV, NI BRAVAR, A BYSTRICKY, J CHAUMETTE, P CORCORAN, MD COSSAIRT, JD CRANSHAW, J DEREGEL, J DEREVSCHIKOV, AA DURAND, G ENYO, H FABRE, J FUKUDA, K FUNAHASHI, H GOTO, Y GRACHOV, OA GROSNICK, DP HILL, DA IIJIMA, T IMAI, K ITOW, Y IWATANI, K KASPRZYK, T KRUEGER, KW KURODA, K LAGHAI, M LEHAR, F DELESQUEN, A LOPIANO, D LUEHRING, FC MAKI, T MAKINO, S MASAIKE, A MATULENKO, YA MESCHANIN, AP MICHALOWICZ, A MILLER, DH MIYAKE, K NAGAMINE, T NESSITEDALDI, F NESSI, M NGUYEN, C NURUSHEV, SB OHASHI, Y ONEL, Y PATALAKHA, DI PAULETTA, G PENZO, A READ, AL ROBERTS, JB VANROSSUM, L RYKOV, VL SAITO, N SALVATO, G SCHIAVON, P SHEPARD, J SKEENS, J SOLOVYANOV, VL SPINKA, H TAKASHIMA, R TAKEUTCHI, F TAMURA, N TANAKA, N UNDERWOOD, DG VASILIEV, AN VILLARI, A WHITE, JL YAMASHITA, S YOKOSAWA, A YOSHIDA, T ZANETTI, A TI MEASUREMENT OF THE DOUBLE-SPIN ASYMMETRY A(LL) FOR INCLUSIVE MULTI-GAMMA PAIR PRODUCTION WITH 200-GEV/C POLARIZED PROTON-BEAM AND POLARIZED PROTON TARGET SO PHYSICS LETTERS B LA English DT Article ID LARGE TRANSVERSE-MOMENTUM; DIRECT PHOTON PRODUCTION; PI-0 PRODUCTION; PP COLLISIONS; 300 GEV/C; DEPENDENCE; SCATTERING; NUCLEON; HADRON; PI+P AB The invariant double-differential cross section, E1E2d6 delta/dp(1)3dp(2)3, and the double-spin asymmetry, A(LL), for inclusive multi-gamma pair production in which gamma-rays came from neutral mesons were measured with a 200 GeV/c longitudinally-polarized proton beam and a longitudinally-polarized proton target. Most of the multi-gamma pairs comes from two-jet type events which are sensitive to partonic interaction. The A(LL) values were found to be consistent with zero. The invariant double-differential cross section for inclusive pi0pi0 production was also measured. These measured cross sections are consistent with LUND Monte Carlo simulations. Using the LUND Monte Carlo simulation package with the Carlitz-Kaur model of spin dependent distribution functions of valence quarks, the A(LL) values have been compared with theoretical predictions of gluon polarization, DELTAG/G. The results put restrictions on the size of DELTAG/G in the region of 0.05 less-than-or-similar-to x less-than-or-similar-to 0.35. C1 UNIV IOWA,DEPT PHYS,IOWA CITY,IA 52242. MOSCOW INST HIGH ENERGY PHYS,PROTOVINO 142284,RUSSIA. CENS,F-91191 GIF SUR YVETTE,FRANCE. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. KYOTO UNIV,DEPT PHYS,KYOTO 606,JAPAN. MEIJI COLL ORIENTAL MED,KYOTO 62903,JAPAN. ARGONNE NATL LAB,ARGONNE,IL 60439. HIROSHIMA UNIV,HIROSHIMA 724,JAPAN. NORTHEASTERN STATE UNIV,TAHLEQUAH,OK 74464. LAB PHYS PARTICULES,F-74017 ANNECY LE VIEUX,FRANCE. NORTHWESTERN UNIV,DEPT PHYS,EVANSTON,IL 60201. UNIV OCCUPAT & ENVIRONM HLTH,KITAKYUSHU,FUKUOKA 807,JAPAN. UNIV UDINE,I-33100 UDINE,ITALY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34100 TRIESTE,ITALY. UNIV MESSINA,DIPARTIMENTO FIS,I-34100 MESSINA,ITALY. KYOTO UNIV,KYOTO 612,JAPAN. KYOTO SANGYO UNIV,KYOTO 612,JAPAN. OKAYAMA UNIV,OKAYAMA 700,JAPAN. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. OSAKA CITY UNIV,OSAKA 558,JAPAN. RP ADAMS, DL (reprint author), RICE UNIV,TW BONNER NUCL LAB,HOUSTON,TX 77251, USA. NR 31 TC 25 Z9 25 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 SEP 22 PY 1994 VL 336 IS 2 BP 269 EP 274 DI 10.1016/0370-2693(94)00998-8 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PG959 UT WOS:A1994PG95900024 ER PT J AU RAMM, AG BERMAN, GP AF RAMM, AG BERMAN, GP TI STABILITY ESTIMATE IN SCATTERING-THEORY AND ITS APPLICATION TO MESOSCOPIC SYSTEMS AND QUANTUM CHAOS SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Article ID ELECTRON-WAVE-GUIDE; CLASSICAL QUANTIZATION; IRREGULAR SCATTERING; HALL RESISTANCE; SIMPLE-MODEL; MECHANICS; REPELLOR; GEOMETRY; BEHAVIOR; WELLS AB We consider the scattering of a free quantum particle on a singular potential with rather arbitrary support boundary geometry. In the classical limit (h) over bar = 0, this problem reduces to the well known problem of chaotic scattering. The universal estimates for the stability of the scattering amplitudes are derived. The application of the obtained results to the mesoscopic systems and quantum chaos are discussed. We also discuss a possibility of experimental verification of the obtained results. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. KRASNOYARSK TECH UNIV,LV KIRENSKY PHYS INST,RES & EDUC CTR NONLINEAR PROC,KRASNOYARSK 660036,RUSSIA. KRASNOYARSK STATE UNIV,DEPT THEORET,KRASNOYARSK 660036,RUSSIA. RP RAMM, AG (reprint author), KANSAS STATE UNIV,DEPT MATH,MANHATTAN,KS 66505, USA. NR 63 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0305-4470 J9 J PHYS A-MATH GEN JI J. Phys. A-Math. Gen. PD SEP 21 PY 1994 VL 27 IS 18 BP 6157 EP 6166 DI 10.1088/0305-4470/27/18/024 PG 10 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA PJ650 UT WOS:A1994PJ65000024 ER PT J AU RENNER, MW BARKIGIA, KM ZHANG, Y MEDFORTH, CJ SMITH, KM FAJER, J AF RENNER, MW BARKIGIA, KM ZHANG, Y MEDFORTH, CJ SMITH, KM FAJER, J TI CONSEQUENCES OF OXIDATION IN NONPLANAR PORPHYRINS - MOLECULAR-STRUCTURE AND DIAMAGNETISM OF THE PI-CATION-RADICAL OF COPPER(II) OCTAETHYLTETRAPHENYLPORPHYRIN SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID PHOTOSYNTHETIC REACTION CENTERS; RHODOBACTER-SPHAEROIDES R-26; CHARGE-TRANSPORT-PROPERTIES; X-RAY STRUCTURES; RESONANCE RAMAN; ELECTRON-TRANSFER; ELECTROCHEMICAL OXIDATION; RHODOPSEUDOMONAS-VIRIDIS; FEMTOSECOND SPECTROSCOPY; NICKEL(II) PORPHYRINS AB Crystal structures are reported for the sterically crowded porphyrin Copper(II) 2,3,7,8,12,13, 17,18-octaethyl-5,10,15,20-tetraphenylporphyrin (Cu(OETPP), 1) and its pi cation radical Cu(OETPP)(ClO4-)-Cl-.+ (2). 1 was chosen to assess the consequences of oxidation in a nonplanar porphyrin on the expectation that its multiple peripheral substituents not only induce an S4 saddle conformation on the macrocycle but should also prevent the dimerizations in the solid that have complicated several previous crystallographic studies of porphyrin pi cation radicals. Interest in the consequences of oxidation arises from the presence of nonplanar bacteriochlorophylls in photosynthetic reaction centers in which the chromophores lie van der Waals contact so that even small structural changes induced by electron transfer would alter the electronic coupling between the pi cation and anion radicals generated by the primary photochemical charge separation. Oxidation of 1 does indeed result in further conformational changes in 2: an additional ruffling is imposed on the original saddle shape of 1 in which the pyrrole rings twist, the meso carbons move alternately up and down out of the porphyrin plane by similar to 0.2 Angstrom, and the phenyl groups rotate further into that plane by more than 10 degrees. The additional distortions are attributed to changes in electronic configuration due to the oxidation and to the low-energy barriers between nonplanar conformers with different degrees of nonplanarity predicted by previous molecular mechanics calculations. OETPPs retain their saddle conformations in solution because of the steric crowding of the multiple substituents. 2 thus provides a test of the proposal by Reed, Scheidt, and co-workers (e.g., J. Am. Chem. Soc. 1987, 109, 2644) that the conformations of porphyrin pi cation radicals comprised of paramagnetic metals control magnetic coupling with the metals and that nonplanar macrocycles exhibit antiferromagnetic coupling. 2 displays optical and FT-IR spectral signatures diagnostic of a pi cation radical in solution, but it is EPR-silent, and its NMR spectrum clearly indicates a diamagnetic species. The Cu(II) and the nonplanar pi radical spins in 2 are thus indeed antiferromagnetically coupled, in accord with the above proposal. The saddle conformation of 1 destabilizes the pi system of the macrocycle and causes the molecule to be readily oxidized with molecular iodine, a mild oxidizing agent. Unexpectedly, the radical crystallized in the presence of excess I-2 carries a discrete I-7(-) counterion. We report here the first example and structure of such a large polyiodide union to be stabilized by a porphyrin cation: Cu(OETPP)I-.+(7-) (3). Crystallographic data. CuN4C60H60 (1): triclinic space group , a = 13.888(4) Angstrom, b = 16.820(3) Angstrom, c = 13.222(3) Angstrom, alpha = 97.33(2)degrees, beta = 107.97(2)degrees, gamma = 103.52(2)degrees, V = 2843.3 Angstrom(3), Z = 2, R(F) = 0.057 and R(wF) = 0.086 based on 7391 reflections with F-o > 3 sigma F-o, T = 298 K. (CuN4C60H60ClO)-Cl-.+(-)(4).CH2Cl2 (2): monoclinic space group P2(1)/n, a = 11.896(1) Angstrom, b = 24.242(5) Angstrom, c = 19.090(3) Angstrom, beta = 100.73(1)degrees, V = 5408.8 Angstrom(3), Z = 4, R(F) = 0.048 and R(wF) = 0.049 based on 4570 reflections with F-o > 3 sigma F-o, T = 298 K. (BBCuN4C60H60I7-)-I-.+ (3): monoclinic space group P2(1), a = 13.108(17) Angstrom, b = 18.332(14) Angstrom, c = 13.683(10) Angstrom, beta = 107.88(8)degrees, V = 3129.2 Angstrom(3), Z = 2, R(F) = 0.101 and R(wF) = 0.117 based on 2269 reflections with F-o > 4 sigma F-o, T = 200 K. C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. RI Medforth, Craig/D-8210-2013; REQUIMTE, FMN/M-5611-2013; REQUIMTE, UCIBIO/N-9846-2013; Smith, Kevin/G-1453-2011 OI Medforth, Craig/0000-0003-3046-4909; Smith, Kevin/0000-0002-6736-4779 NR 97 TC 136 Z9 138 U1 4 U2 20 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 SEP 21 PY 1994 VL 116 IS 19 BP 8582 EP 8592 DI 10.1021/ja00098a019 PG 11 WC Chemistry, Multidisciplinary SC Chemistry GA PH531 UT WOS:A1994PH53100019 ER PT J AU BULLOCK, RM SONG, JS AF BULLOCK, RM SONG, JS TI IONIC HYDROGENATIONS OF HINDERED OLEFINS AT LOW-TEMPERATURE - HYDRIDE TRANSFER-REACTIONS OF TRANSITION-METAL HYDRIDES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID ORGANOMETALLIC LEWIS-ACIDS; ATOM TRANSFER-REACTIONS; RADICAL PAIR MECHANISM; M = CR; DIHYDROGEN COMPLEXES; PROTON-TRANSFER; ALPHA-CYCLOPROPYLSTYRENE; DIARYLCARBENIUM IONS; CARBONYL HYDRIDES; CONJUGATED DIENES AB Sterically hindered olefins can be hydrogenated at -50 degrees C in dichloromethane using triflic acid (CF3SO3H) and a hydride donor. Mechanistic studies indicate that these reactions proceed by hydride transfer to the carbenium ion that is formed by protonation of the olefin. Olefins that form tertiary carbenium ions upon protonation are hydrogenated in high yields (90-100%). Styrenes generally produce lower yields of hydrogenated products (50-60%). Suitable hydride donors include HSiEt(3) and several transition metal carbonyl hydrides (HW(CO)(3)Cp, HW(CO)(3)Cp*, HMo(CO)(3)Cp, HMn(CO)(5), HRe(CO)(5), and HOs(CO)(2)Cp*; Cp = eta(5)-C5H5, Cp* = eta(5)-C(5)Me(5)). A characteristic that is required for transition metal hydrides to be effective is that the cationic dihydrides (or dihydrogen complexes) that result from their protonation must have sufficient acidity to transfer a proton to the olefin, as well as sufficient thermal stability to avoid significant decomposition on the time scale of the hydrogenation reaction. Metal hydrides that fail due to insufficient stability of their protonated forms include HMo(CO)(2)(PPh(3))Cp, HMo(CO)(3)Cp*, and HFe(CO)(2)Cp*. Other hydrides that fail are those that are protonated to give dihydrides or dihydrogen complexes that are not sufficiently acidic to protonate olefins, as found for HW(CO)(2)(PMe(3))Cp and HRu(CO)(PMe(3))Cp. RP BULLOCK, RM (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. RI Bullock, R. Morris/L-6802-2016 OI Bullock, R. Morris/0000-0001-6306-4851 NR 67 TC 65 Z9 65 U1 0 U2 8 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 SEP 21 PY 1994 VL 116 IS 19 BP 8602 EP 8612 DI 10.1021/ja00098a021 PG 11 WC Chemistry, Multidisciplinary SC Chemistry GA PH531 UT WOS:A1994PH53100021 ER PT J AU COMASKEY, B ALBRECHT, GF VELSKO, SP MORAN, BD AF COMASKEY, B ALBRECHT, GF VELSKO, SP MORAN, BD TI 24-W AVERAGE POWER AT 0.537-MU-M FROM AN EXTERNALLY FREQUENCY-DOUBLED Q-SWITCHED DIODE-PUMPED ND-YOS LASER-OSCILLATOR SO APPLIED OPTICS LA English DT Article AB A diode-pumped single Nd:YOS rod laser is operated at 110 Hz with 830-mJ free-laser pulses and 380-mJ, 13-ns (FWHM) Q-switched pulses. External doubling with an 8-mm-long KTP crystal results in 24 W at 0.537 mum after thermalization. RP COMASKEY, B (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 808, 7000 E AVE, LIVERMORE, CA 94550 USA. NR 16 TC 13 Z9 13 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD SEP 20 PY 1994 VL 33 IS 27 BP 6377 EP 6382 PG 6 WC Optics SC Optics GA PJ393 UT WOS:A1994PJ39300015 PM 20941173 ER PT J AU WOOSLEY, SE WILSON, JR MATHEWS, GJ HOFFMAN, RD MEYER, BS AF WOOSLEY, SE WILSON, JR MATHEWS, GJ HOFFMAN, RD MEYER, BS TI THE R-PROCESS AND NEUTRINO-HEATED SUPERNOVA EJECTA SO ASTROPHYSICAL JOURNAL LA English DT Article DE ELEMENTARY PARTICLES; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES; SUPERNOVAE, GENERAL ID PROCESS NUCLEOSYNTHESIS; STAR ACCRETION; ABUNDANCES; HEAVY; ELEMENTS; COLLAPSE; BUBBLE; MODEL AB As a neutron star is formed by the collapse of the iron core of a massive star, its Kelvin-Helmholtz evolution is characterized by the release of gravitational binding energy as neutrinos. The interaction of these neutrinos with heated material above the neutron star generates a hot bubble in an atmosphere that is nearly in hydrostatic equilibrium and heated, after approximately 10 s, to an entropy of S/N(A) k greater than or similar to 400. The neutron-to-proton ratio for material moving outward through this bubble is set by the balance between neutrino and antineutrino capture on nucleons. Because the electron antineutrino spectrum at this time is hotter than the electron neutrino spectrum, the bubble is neutron-rich (0.38 less than or similar to Y(e) less than or similar to 0.47). Previous work using a schematic model has shown that these conditions are well suited to the production of heavy elements by the r-process. In this paper we have advanced the numerical modeling of a 20 M. ''delayed'' supernova explosion to the point that we can follow the detailed evolution of material moving through the bubble at the late times appropriate to r-process nucleosynthesis. The supernova model predicts a final kinetic energy for the ejecta of 1.5 x 10(51) ergs and leaves behind a remnant with a baryon mass of 1.50 M. (and a gravitational mass of 1.445 M.). We follow the thermodynamic and compositional evolution of 40 trajectories in rho(t), T(t), Y(e)(t) for a logarithmic grid of mass elements for the last almost-equal-to 0.03 M. to be ejected by the proto-neutron star down to the last <10(-6) M. of material expelled at up to almost-equal-to 18 s after core collapse. We find that an excellent fit to the solar r-process abundance distribution is obtained with no adjustable parameters in the nucleosynthesis calculations. Moreover, the abundances are produced in the quantities required to account for the present Galactic abundances. However, at earlier times, this one-dimensional model ejects too much material with entropies S/N(A) k approximately 50 and Y(e) approximately 0.46. This leads to an unacceptable overproduction of N = 50 nuclei, particularly Sr-88, Y-89, and Zr-90, relative to their solar abundances. We speculate on various means to avoid the early overproduction and/or ejection of N = 50 isotonic nuclei while still producing and ejecting the correct amount of r-process material. C1 CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP WOOSLEY, SE (reprint author), UNIV CALIF SANTA CRUZ,UNIV CALIF OBSERV,LICK OBSERV,BOARD STUDIES ASTRON & ASTROPHYS,SANTA CRUZ,CA 95064, USA. NR 52 TC 583 Z9 586 U1 1 U2 11 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 20 PY 1994 VL 433 IS 1 BP 229 EP 246 DI 10.1086/174638 PN 1 PG 18 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PG639 UT WOS:A1994PG63900019 ER PT J AU CERNOHORSKY, J AF CERNOHORSKY, J TI SYMMETRIES IN NEUTRINO-ELECTRON SCATTERING SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC PROCESSES; ELEMENTARY PARTICLES AB The symmetries of the neutrino-electron scattering kernel are exposed. The kernel must explicitly conserve particle number at each vertex and vanish in local thermodynamic equilibrium. I show that the latter requirement must be met by the combination of detailed balance between in and out beams and a symmetry property of the kernel that until now has gone unnoticed. Exploitation of this extra symmetry approximately doubles the computational efficiency of the algorithm. RP CERNOHORSKY, J (reprint author), LAWRENCE BERKELEY LAB,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 4 TC 8 Z9 8 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 SEP 20 PY 1994 VL 433 IS 1 BP 247 EP 249 PN 1 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PG639 UT WOS:A1994PG63900020 ER PT J AU CERNOHORSKY, J BLUDMAN, SA AF CERNOHORSKY, J BLUDMAN, SA TI MAXIMUM-ENTROPY DISTRIBUTION AND CLOSURE FOR BOSE-EINSTEIN AND FERMI-DIRAC RADIATION TRANSPORT SO ASTROPHYSICAL JOURNAL LA English DT Article DE RADIATION MECHANISMS, NONTHERMAL; STARS, NEUTRON ID ENTROPY EDDINGTON FACTORS; LIMITED NEUTRINO DIFFUSION AB We derive and study the variable Eddington factors following without approximation from the maximum entropy distribution. A unified formalism is developed for classical Maxwell-Boltzmann, Bose-Einstein, and Fermi-Dirac radiation. In the classical and high occupancy limits the maximum entropy closure is bounded by previously known variable Eddington factors that depend only on the flux: the Levermore-Pomraning closure for Bose radiation at high occupation density and Minerbo's flux-limiter for the Boltzmann limit of either quantum statistics. For intermediate occupancy, the maximum entropy closure depends on both the occupation density and the flux. The Fermi-Dirac maximum entropy variable Eddington factor exhibits scale invariance, which leads to a simple analytic closure for fermion radiation. This Fermi-Dirac variable Eddington factor agrees well with Monte Carlo neutrino transport closures during early stages of neutron star formation. C1 CTR PARTICLE ASTROPHYS,BERKELEY,CA. UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. RP CERNOHORSKY, J (reprint author), LAWRENCE BERKELEY LAB,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 11 TC 19 Z9 19 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 SEP 20 PY 1994 VL 433 IS 1 BP 250 EP 255 DI 10.1086/174640 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PG639 UT WOS:A1994PG63900021 ER PT J AU CERF, C LIPPENS, G RAMAKRISHNAN, V MUYLDERMANS, S SEGERS, A WYNS, L WODAK, SJ HALLENGA, K AF CERF, C LIPPENS, G RAMAKRISHNAN, V MUYLDERMANS, S SEGERS, A WYNS, L WODAK, SJ HALLENGA, K TI HOMONUCLEAR AND HETERONUCLEAR 2-DIMENSIONAL NMR-STUDIES OF THE GLOBULAR DOMAIN OF HISTONE H1 - FULL ASSIGNMENT, TERTIARY STRUCTURE, AND COMPARISON WITH THE GLOBULAR DOMAIN OF HISTONE H5 SO BIOCHEMISTRY LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; COOPERATIVE BINDING; SECONDARY STRUCTURE; NUCLEOSOME BINDING; CRYSTAL-STRUCTURE; CHROMATIN; DNA; H-5; ORGANIZATION; SITE AB The globular domain of chicken histone H1 (GH1) has been studied by H-1 homonuclear and H-1-N-15 heteronuclear 2D NMR spectroscopy. After the full assignment of the proton and N-15 resonances, the tertiary structure of GH1 was determined by an iterative procedure using distance geometry and restrained simulated annealing. The secondary structure elements of GH1, three helices (S5-A16, S24-A34, N42-K56) followed by a beta-hairpin (L59-L73), are folded in a manner very similar to the corresponding parts of the globular domain of chicken histone H5 (GH5) [Clore et al. (1987) EMBO J. 6, 1833-1842; Ramakrishnan et al. (1993) Nature 362, 219-223]. However, subtle differences are detected between the two structures and between the electrostatic potentials surrounding the molecules. The most important differences are located in the loop between the second and third helices, a region that could be responsible for the different affinity for DNA. The most positively charged regions are not found in exactly the same position in GH1 and GH5. Nevertheless, their location seems to agree with the model where nucleosome binding takes place through contact points located at one DNA terminus and close to the dyad axis of the nucleosome [Schwabe & Travers (1993) Curr. Biol. 3, 628-630]. C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. FREE UNIV BRUSSELS,INST MOLEC BIOL,B-1640 RHODE ST GENESE,BELGIUM. RP CERF, C (reprint author), FREE UNIV BRUSSELS,CONFORMAT MACROMOLEC BIOL UNITE,CP-160-16,AVE P HEGER,BRUSSELS,BELGIUM. RI Muyldermans, Serge/C-6418-2016 OI Muyldermans, Serge/0000-0002-3678-3575 FU NIGMS NIH HHS [GM42796] NR 44 TC 75 Z9 75 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD SEP 20 PY 1994 VL 33 IS 37 BP 11079 EP 11086 DI 10.1021/bi00203a004 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA PH174 UT WOS:A1994PH17400004 PM 7727360 ER PT J AU LIAW, SH JUN, G EISENBERG, D AF LIAW, SH JUN, G EISENBERG, D TI INTERACTIONS OF NUCLEOTIDES WITH FULLY UNADENYLYLATED GLUTAMINE-SYNTHETASE FROM SALMONELLA-TYPHIMURIUM SO BIOCHEMISTRY LA English DT Article ID SEQUENCE; BINDING; MODEL; SITE AB Glutamine synthetase (GS) catalyzes the ATP-dependent biosynthesis of glutamine from glutamate and ammonia in the presence of divalent cations. To gain insight into the structural basis of the feedback inhibition of GS by AMP, we have studied crystal structures of GS complexes with AMP and the related molecules: AMPPNP (a less hydrolyzable ATP analog), ADP, GDP, adenosine, and adenine. AMP is a feedback inhibitor of GS; ATP and ADP are cofactors, and AMPPNP, GDP, adenosine, and adenine are also GS inhibitors. GS used in this study is from Salmonella typhimurium and is free of covalent modification by adenylylation. All of the crystals examined contain two bound Mn2+ ions per GS subunit. The X-ray structures show that all nucleotides bind at the same site, the cofactor ATP binding site, as do adenosine and adenine. Thus from X-ray structures, AMP, adenosine, adenine, and GDP would be expected to inhibit GS-Mn by competing with the substrate ATP for the active site. This suggestion from the crystal structures that AMP is competitive with respect to ATP is supported by kinetic measurements using the biosynthetic assay. C1 UNIV CALIF LOS ANGELES,INST MOLEC BIOL,US DOE,STRUCT BIOL & MOLEC MED LAB,LOS ANGELES,CA 90024. NATL TAIWAN UNIV,SCH MED,INST MOLEC MED,TAIPEI,TAIWAN. UNIV CALIF LOS ANGELES,DEPT CHEM & BIOCHEM,LOS ANGELES,CA 90024. FU NIGMS NIH HHS [GM 31299] NR 32 TC 38 Z9 38 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD SEP 20 PY 1994 VL 33 IS 37 BP 11184 EP 11188 DI 10.1021/bi00203a014 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA PH174 UT WOS:A1994PH17400014 PM 7727369 ER PT J AU SAVIKHIN, S STRUVE, WS AF SAVIKHIN, S STRUVE, WS TI ULTRAFAST ENERGY-TRANSFER IN FMO TRIMERS FROM THE GREEN BACTERIUM CHLOROBIUM-TEPIDUM SO BIOCHEMISTRY LA English DT Article ID BACTERIOCHLOROPHYLL-A-PROTEIN; AMINO-ACID SEQUENCE; PROSTHECOCHLORIS-AESTUARII; PHOTOSYNTHETIC BACTERIA; OPTICAL-SPECTRA; EXCITON INTERACTION; MOLECULAR PAIRS; ALPHA-PROTEIN; PUMP; ABSORPTION AB Time-resolved absorption difference profiles were obtained for FMO trimers, isolated from the green thermophilic bacterium Chlorobium tepidum, using one- and two-color femtosecond pump-probe techniques. Uphill and downhill energy transfers between inequivalent pigments in this antenna contribute to lifetime components that range from similar to 100 to similar to 900 fs in the isotropic absorption difference signals, depending on the pump and probe wavelengths. Vibrational thermalization of BChl a pigments may also influence the kinetics. The major lifetime components in the anisotropy decays at most wavelengths are 75-135 fs and 1.4-2.0 ps. The slower anisotropy decays probably stem from equilibration among equivalent, lowest-energy pigments belonging to different subunits in the trimer. The initial anisotropy r(O) is appreciably larger than 0.4 at several wavelengths, but r(t) typically decays to a value less than 0.4 within similar to 100 fs. C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 37 TC 38 Z9 38 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD SEP 20 PY 1994 VL 33 IS 37 BP 11200 EP 11208 DI 10.1021/bi00203a016 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA PH174 UT WOS:A1994PH17400016 PM 7727371 ER PT J AU ZHAN, HJ CHOE, S HUYNH, PD FINKELSTEIN, A EISENBERG, D COLLIER, RJ AF ZHAN, HJ CHOE, S HUYNH, PD FINKELSTEIN, A EISENBERG, D COLLIER, RJ TI DYNAMIC TRANSITIONS OF THE TRANSMEMBRANE DOMAIN OF DIPHTHERIA-TOXIN - DISULFIDE TRAPPING AND FLUORESCENCE PROXIMITY STUDIES SO BIOCHEMISTRY LA English DT Article ID PLANAR LIPID BILAYERS; LOW-PH; MEMBRANE TRANSLOCATION; ESCHERICHIA-COLI; SECONDARY STRUCTURE; CRYSTAL-STRUCTURE; LACTOSE PERMEASE; PROTEIN; RESOLUTION; RECEPTOR AB Translocation of the catalytic domain of diphtheria toxin across the endosomal membrane to the cytosolic compartment depends on low-pH-triggered insertion of the toxin's T (transmembrane) domain into the membrane. The T domain, consisting of nine alpha-helices arranged in three layers, was cloned and expressed as a discrete protein in Escherichia coli, and mutant forms were prepared and characterized. To investigate the relative movements of the three layers under various conditions, we generated two mutant forms of the domain, each containing an artificial intramolecular disulfide bridge linking the buried apolar hairpin (TH8-TH9) to one of the other two layers. Both disulfides inhibited exposure of the domain's apolar regions in solution at low pH, as determined by 2-p-toluidinylnaphthalene-6-sulfonate binding, and blocked its ability to form channels in artificial bilayers. Reduction of the bridges abolished these effects. Reduced forms of the mutant proteins were reacted with pyrenylmaleimide, a fluorescent probe, to monitor separation of the layers. Strong excimer bands seen in both mutants at neutral pH were undiminished at pH 5, indicating the retention of gross conformation in solution under acidic conditions. The addition of phospholipid vesicles at pH 5, but not at pH 7.5, quenched excimer fluorescence, reflecting the physical separation of the TH8-TH9 hairpin from the other layers upon the T domain's interaction with the bilayer. The results indicate that (i) the conformation of the isolated T domain closely resembles that seen in the whole toxin, (ii) the TH8-TH9 hairpin separates from both of the other layers of the domain as an essential step of membrane insertion, and (iii) this separation is triggered by contact of the domain with the membrane under acidic conditions. C1 HARVARD UNIV, SCH MED, DEPT MICROBIOL & MOLEC GENET, BOSTON, MA 02115 USA. HARVARD UNIV, SCH MED, SHIPLEY INST MED, BOSTON, MA 02115 USA. ALBERT EINSTEIN COLL MED, DEPT PHYSIOL & BIOPHYS & NEUROSCI, BRONX, NY 10461 USA. UNIV CALIF LOS ANGELES, INST MOLEC BIOL, DEPT CHEM & BIOCHEM, LOS ANGELES, CA 90024 USA. UNIV CALIF LOS ANGELES, US DOE, STRUCT BIOL & MOLEC MED LAB, LOS ANGELES, CA 90024 USA. OI Finkelstein, Alexei/0000-0002-2138-4803 FU NIAID NIH HHS [AI22848, AI22021]; NIGMS NIH HHS [GM29210] NR 55 TC 69 Z9 69 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD SEP 20 PY 1994 VL 33 IS 37 BP 11254 EP 11263 DI 10.1021/bi00203a022 PG 10 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA PH174 UT WOS:A1994PH17400022 PM 7537085 ER PT J AU BAKER, GA GRAVESMORRIS, PR AF BAKER, GA GRAVESMORRIS, PR TI EXISTENCE OF CERTAIN SEQUENCES OF HERMITE-PADE APPROXIMANTS SO JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS LA English DT Article DE HERMITE-PADE APPROXIMANT; INTEGRAL APPROXIMANT; DIFFERENTIAL APPROXIMANT; ALGEBRAIC APPROXIMANT; PADE APPROXIMANT ID TABLE AB We prove the existence of infinite sequences of unique, minimal Hermite-Pade polynomials of horizontal, near-partially-diagonal and near-diagonal character. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV BRADFORD,DEPT MATH,BRADFORD BD7 1DP,W YORKSHIRE,ENGLAND. NR 4 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-0427 J9 J COMPUT APPL MATH JI J. Comput. Appl. Math. PD SEP 20 PY 1994 VL 54 IS 1 BP 45 EP 49 DI 10.1016/0377-0427(94)90393-X PG 5 WC Mathematics, Applied SC Mathematics GA QF580 UT WOS:A1994QF58000004 ER EF