FN Thomson Reuters Web of Science™ VR 1.0 PT J AU BARBAS, JT SIGMAN, ME BUCHANAN, AC CHEVIS, EA AF BARBAS, JT SIGMAN, ME BUCHANAN, AC CHEVIS, EA TI PHOTOLYSIS OF SUBSTITUTED NAPHTHALENES ON SIO2 AND AL2O3 SO PHOTOCHEMISTRY AND PHOTOBIOLOGY LA English DT Article ID SILICA-GEL; GEOMETRY; SURFACES AB Photolysis of naphthalene on the surface of SiO2 under an atmosphere of air produces phthalic acid as the only major photoproduct, accounting for 49% of the consumed naphthalene. Photolysis on Al2O3 also produces phthalic acid, in 31% yield. Photolysis of 1-methylnaphthalene on SiO2 proceeds under similar conditions to produce 2-acetylbenzoic acid (35%) as the major photoproduct with the production of a small amount of 1-naphthaldehyde (6%). 1-Cyanonaphthalene does not photooxidize under similar conditions. The presence of oxygen is necessary for the photodecomposition of naphthalene and 1-methylnaphthalene to proceed. Superoxide formed from the photolysis of naphthalene at the SiO2/air interface is readily observed by electron paramagnetic resonance spectroscopy. In the absence of naphthalene no superoxide is observed. A mechanism involving electron transfer from the S1 state of the naphthalene to O2 is proposed on the basis of these observations and related literature precedent. C1 OAK RIDGE NATL LAB,DIV CHEM,POB 2008,OAK RIDGE,TN 37831. NR 24 TC 35 Z9 35 U1 2 U2 7 PU AMER SOC PHOTOBIOLOGY PI AUGUSTA PA BIOTECH PARK, 1021 15TH ST, SUITE 9, AUGUSTA, GA 30901-3158 SN 0031-8655 J9 PHOTOCHEM PHOTOBIOL JI Photochem. Photobiol. PD AUG PY 1993 VL 58 IS 2 BP 155 EP 158 DI 10.1111/j.1751-1097.1993.tb09541.x PG 4 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA LT882 UT WOS:A1993LT88200001 ER PT J AU BALDWIN, DP DSILVA, AP AF BALDWIN, DP DSILVA, AP TI UNRELIABLE VENDORS SO PHOTONICS SPECTRA LA English DT Letter RP BALDWIN, DP (reprint author), IOWA STATE UNIV SCI & TECHNOL,DOE,AMES LAB,AMES,IA 50011, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAURIN PUBL CO INC PI PITTSFIELD PA BERKSHIRE COMMON PO BOX 1146, PITTSFIELD, MA 01202 SN 0731-1230 J9 PHOTON SPECTRA JI Photon. Spect. PD AUG PY 1993 VL 27 IS 8 BP 12 EP 12 PG 1 WC Optics SC Optics GA LR599 UT WOS:A1993LR59900002 ER PT J AU SHI, DG SENGUPTA, S LUO, JS VARANASI, C MCGINN, PJ AF SHI, DG SENGUPTA, S LUO, JS VARANASI, C MCGINN, PJ TI EXTREMELY FINE PRECIPITATES AND FLUX-PINNING IN MELT-PROCESSED YBA2CU3OX SO PHYSICA C LA English DT Article ID CRITICAL CURRENTS; CURRENT-DENSITY; HIGH-JC; SUPERCONDUCTORS; CRYSTALS AB Extremely fine Y2BaCuO5 (21 1) precipitates (approximately 100 angstrom) have been observed by transmission electron microscopy in melt-processed YBa2Cu3Ox (123). Magnetization measurements have been performed on samples with and without these ultrafine 211 particles. Our results show that there is a strong correlation between the microstructure and the flux pinning behavior. The J(c) values have significantly increased in a wide range of temperature and field, indicating that these fine 211 precipitates can act as strong flux pinning centers in the 123 system. C1 UNIV NOTRE DAME,DEPT ELECT ENGN,NOTRE DAME,IN 46556. RP SHI, DG (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 17 TC 47 Z9 48 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 AUG 1 PY 1993 VL 213 IS 1-2 BP 179 EP 184 DI 10.1016/0921-4534(93)90774-K PG 6 WC Physics, Applied SC Physics GA LQ553 UT WOS:A1993LQ55300024 ER PT J AU CLAUS, H YANG, S VISWANATHAN, HK CRABTREE, GW DOWNEY, JW VEAL, BW AF CLAUS, H YANG, S VISWANATHAN, HK CRABTREE, GW DOWNEY, JW VEAL, BW TI COMPARISON OF AU-FREE VERSUS AU-DOPED YBA2CU3O7-DELTA SINGLE-CRYSTALS - OVERDOPING AND OXYGEN MOBILITY SO PHYSICA C LA English DT Article ID DEFICIENT YBA2CU3O7-DELTA; SUPERCONDUCTIVITY; DISORDER; GOLD AB By systematically changing the oxygen concentration of YBa2Cu3O7-delta single crystals grown in Au-crucibles, we demonstrate that the incorporated Au-impurities have only a minor effect on the maximum in T(c) due to overdoping. On the other hand, we demonstrate that the Au-impurities significantly increase the oxygen mobility in the basal planes of oxygen deficient YBa2Cu3O7-delta single crystals. C1 ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439. UNIV ILLINOIS,DEPT MAT SCI,CHICAGO,IL 60680. RP CLAUS, H (reprint author), UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60680, USA. NR 15 TC 17 Z9 18 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG 1 PY 1993 VL 213 IS 1-2 BP 185 EP 189 DI 10.1016/0921-4534(93)90775-L PG 5 WC Physics, Applied SC Physics GA LQ553 UT WOS:A1993LQ55300025 ER PT J AU SCHIRBER, JE BAYLESS, WR KORTAN, AR KOPYLOV, N AF SCHIRBER, JE BAYLESS, WR KORTAN, AR KOPYLOV, N TI PRESSURE-DEPENDENCE OF THE SUPERCONDUCTING TRANSITION OF CALCIUM FULLERENE CA5C60 SO PHYSICA C LA English DT Article ID ELECTRONIC-STRUCTURE; DOPED C-60 AB We have measured the pressure dependence of the superconducting transition temperature of Ca5C60. In striking contrast to the alkali doped C60 superconductors, where a large negative derivative is observed, we find a small positive derivative of 0.11 (+/- 0.05) K/kbar. This result is in disagreement with a simple extension of current models. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. RP SCHIRBER, JE (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 12 TC 8 Z9 8 U1 3 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG 1 PY 1993 VL 213 IS 1-2 BP 190 EP 192 DI 10.1016/0921-4534(93)90776-M PG 3 WC Physics, Applied SC Physics GA LQ553 UT WOS:A1993LQ55300026 ER PT J AU KOSTELECKY, VA MANKO, VI NIETO, MM TRUAX, DR AF KOSTELECKY, VA MANKO, VI NIETO, MM TRUAX, DR TI SUPERSYMMETRY AND A TIME-DEPENDENT LANDAU SYSTEM SO PHYSICAL REVIEW A LA English DT Article ID 1ST-ORDER DIRAC-EQUATION; COHERENT STATES; SUPERGROUPS; FIELD AB A general technique is outlined for investigating supersymmetry properties of a charged spin-1/2 quantum particle in time-varying electromagnetic fields. The case of a time-varying uniform magnetic induction is examined and shown to provide a physical realization of a supersymmetric quantum-mechanical system. Group-theoretic methods are used to factorize the relevant Schrodinger equations and obtain eigensolutions. The supercoherent states for this system are constructed. C1 PN LEBEDEV PHYS INST,MOSCOW 117924,RUSSIA. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV CALGARY,DEPT CHEM,CALGARY T2N 1N4,ALBERTA,CANADA. RP KOSTELECKY, VA (reprint author), INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47405, USA. RI Man'ko, Vladimir/C-5353-2014 OI Man'ko, Vladimir/0000-0003-3972-0227 NR 37 TC 16 Z9 16 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD AUG PY 1993 VL 48 IS 2 BP 951 EP 963 DI 10.1103/PhysRevA.48.951 PG 13 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LQ990 UT WOS:A1993LQ99000015 ER PT J AU KOSTELECKY, VA NIETO, MM TRUAX, DR AF KOSTELECKY, VA NIETO, MM TRUAX, DR TI SUPERSQUEEZED STATES SO PHYSICAL REVIEW A LA English DT Article ID CAMPBELL-HAUSDORFF RELATIONS; COHERENT STATES; SUPERCOHERENT STATES; GENERAL POTENTIALS; SUPERGROUPS; REPRESENTATIONS; OSCILLATOR; FORMALISM; OPERATORS AB We derive the supersqueeze operator for the supersymmetric harmonic oscillator, using Baker-Campbell-Hausdorff relations for the supergroup OSP(2/2). Combining this with the previously obtained superdisplacement operator, we derive the supersqueezed states. These are the supersymmetric generalization of the squeezed states of the harmonic oscillator. C1 LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. UNIV CALGARY, DEPT CHEM, CALGARY T2N 1N4, ALBERTA, CANADA. RP INDIANA UNIV, DEPT PHYS, BLOOMINGTON, IN 47405 USA. NR 51 TC 11 Z9 11 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9926 EI 2469-9934 J9 PHYS REV A JI Phys. Rev. A PD AUG PY 1993 VL 48 IS 2 BP 1045 EP 1054 DI 10.1103/PhysRevA.48.1045 PG 10 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LQ990 UT WOS:A1993LQ99000025 ER PT J AU DUBOIS, RD AF DUBOIS, RD TI DIFFERENTIAL ELECTRON-EMISSION FOR ISOTACTIC H+ AND HE-2+ IMPACT ON HELIUM SO PHYSICAL REVIEW A LA English DT Article ID PROJECTILE-CHARGE DEPENDENCE; ION-ATOM COLLISIONS; CROSS-SECTIONS; INTERMEDIATE ENERGIES; IONIZING COLLISIONS; HE COLLISIONS; IONIZATION; AR; SPECTRA; NE AB Experimental data are presented for differential electron emission from helium induced by isotachic H+ and He-2+ impact. Electron emission at 15-degrees was studied in order to investigate maxima in the d2sigma/dupsilon(e)dOMEGA spectra. These maxima were previously observed to shift to lower electron velocities as the projectile charge state increased and the shifts were interpreted as evidence of an independent saddle-point-ionization mechanism. The present data for H+ and He2+ impact do not confirm any such shifts and indicate that previous He-2+ measurements, where shifts were observed, are in error. RP DUBOIS, RD (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 16 TC 27 Z9 27 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD AUG PY 1993 VL 48 IS 2 BP 1123 EP 1128 DI 10.1103/PhysRevA.48.1123 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LQ990 UT WOS:A1993LQ99000034 ER PT J AU CHEN, MH REED, KJ AF CHEN, MH REED, KJ TI EFFECTS OF RELATIVITY AND M2 TRANSITIONS ON THE RESONANCE CONTRIBUTIONS TO ELECTRON-IMPACT IONIZATION OF HIGHLY-CHARGED LI-LIKE IONS SO PHYSICAL REVIEW A LA English DT Article ID EXCITATION-DOUBLE-AUTOIONIZATION; LITHIUM-LIKE IONS; BE-LIKE IONS; CROSS-SECTIONS; C-3+ IONS; X-RAY; AUGER; EMISSION; FE-15+; O-5+ AB The effects of relativity on resonance contributions to electron-impact ionization of Ar15+, Fe23+, Kr33+, and Xe51+ are investigated. The effects of relativity are found to increase the resonance strengths by 20% for Fe23+ and by as much as a factor of 3 for Xe51+. The magnetic quadrupole (M2) radiation for the 1s2s2P3/2 J=5/2 metastable state depends strongly on the atomic number, varying as Z8. We find that including the M2 emission for the 1s2s2p3/2 J=5/2 state is essential for obtaining reliable cross sections for ions with Z greater-than-or-equal-to 26. RP CHEN, MH (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV HIGH TEMP PHYS,LIVERMORE,CA 94550, USA. NR 21 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD AUG PY 1993 VL 48 IS 2 BP 1129 EP 1133 DI 10.1103/PhysRevA.48.1129 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LQ990 UT WOS:A1993LQ99000035 ER PT J AU CORDREY, IL MACEK, JH AF CORDREY, IL MACEK, JH TI THEORY OF THE ANGLE-DEPENDENT AUTOIONIZATION CROSS-SECTION IN ION-ATOM COLLISIONS SO PHYSICAL REVIEW A LA English DT Article ID ENERGY; INTERFERENCE; TRANSITIONS; ELECTRONS; STATES; HE+ AB The angle-dependent cross section for perturbed overlapping autoionization lines excited in ion-atom collisions is derived analytically. This electron angular distribution shows strong enhancement in the forward direction, and includes interference between overlapping lines that profoundly affect the cross section in the forward direction. The relative cross sections of autoionization lines excited in He+ + He collisions at 5, 10, and 15 keV are calculated and found to be in good agreement with experiment. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP CORDREY, IL (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. NR 14 TC 18 Z9 18 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD AUG PY 1993 VL 48 IS 2 BP 1264 EP 1270 DI 10.1103/PhysRevA.48.1264 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LQ990 UT WOS:A1993LQ99000052 ER PT J AU RAPHAELIAN, MLA BERRY, HG BERRAH, N SCHNEIDER, D AF RAPHAELIAN, MLA BERRY, HG BERRAH, N SCHNEIDER, D TI DOUBLE-ELECTRON CAPTURE IN NE8+-HE COLLISIONS AT INTERMEDIATE ENERGIES SO PHYSICAL REVIEW A LA English DT Article ID HIGHLY CHARGED IONS; SPECTROSCOPY; H-2 AB High-resolution Auger spectra of doubly excited Be-like neon have been obtained for intermediate collisional velocities (0.89-1.79 a.u.). Ne8+ was produced at high voltage in the Argonne National Laboratory electron-cyclotron-resonance ion source. A differentially pumped helium gas cell was used to study double electron capture. The LMX Auger decays of the Be-like neon are observed with a high-resolution 0-degrees tandem electron spectrometer. High-angular-momentum states are observed to be populated during the collisions and their relative amplitudes change dramatically with increasing collisional velocity. C1 ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. LAWRENCE LIVERMORE NATL LAB,DIV HIGH TEMP PHYS,LIVERMORE,CA 94550. NR 11 TC 8 Z9 8 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD AUG PY 1993 VL 48 IS 2 BP 1292 EP 1297 DI 10.1103/PhysRevA.48.1292 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LQ990 UT WOS:A1993LQ99000055 ER PT J AU SHIMKAVEG, G QUIVERS, WW DASARI, RR FELD, MS AF SHIMKAVEG, G QUIVERS, WW DASARI, RR FELD, MS TI DIRECT MEASUREMENT OF VELOCITY-CHANGING COLLISION CROSS-SECTIONS BY LASER OPTICAL-PUMPING SO PHYSICAL REVIEW A LA English DT Article ID PISTON; TARGETS; SODIUM AB We extend the theory of velocity-selective laser optical pumping in atomic vapors, allowing for arbitrarily rapid velocity-changing collisional rates. The results yield a simple relationship between the line-shape areas of narrow spectroscopic features present in optically pumped samples. This relationship gives directly the ground- and excited-state velocity-changing collision rates and cross sections. We use the results to analyze the data from a laser optical-pumping experiment in Li-6 vapor perturbed by Ar buffer gas. C1 WELLESLEY COLL,DEPT PHYS,WELLESLEY,MA 02181. MIT,GEORGE R HARRISON SPECT LAB,CAMBRIDGE,MA 02139. RP SHIMKAVEG, G (reprint author), LAWRENCE LIVERMORE NATL LAB,L-43,LIVERMORE,CA 94550, USA. NR 19 TC 6 Z9 6 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD AUG PY 1993 VL 48 IS 2 BP 1409 EP 1418 DI 10.1103/PhysRevA.48.1409 PG 10 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LQ990 UT WOS:A1993LQ99000068 ER PT J AU SIMIONOVICI, A BIRKETT, BB BRIAND, JP CHARLES, P DIETRICH, DD FINLAYSON, K INDELICATO, P LIESEN, D MARRUS, R AF SIMIONOVICI, A BIRKETT, BB BRIAND, JP CHARLES, P DIETRICH, DD FINLAYSON, K INDELICATO, P LIESEN, D MARRUS, R TI N = 2 TO N = 1 FORBIDDEN TRANSITIONS IN H-LIKE AND HE-LIKE SILVER AND NIOBIUM SO PHYSICAL REVIEW A LA English DT Note ID HELIUMLIKE IONS; DECAY-RATES; 23S1 STATE; LIFETIME; HYDROGENLIKE; NICKEL; ARGON AB We report on beam-foil time-of-flight measurements of forbidden transitions in H-like and He-like Nb and Ag. The lifetimes of the 2 S-1(0) state of He-like Nb, the 2s1/2 state of H-like Ag, and the P-3(2) state of He-like Ag have been measured with precisions ranging from 1.7% to 10%. These are the highest-Z ions for which these lifetimes have been measured. C1 UNIV PARIS 06,PHYS ATOM & NUCL LAB,F-75252 PARIS,FRANCE. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. GESELL SCHWERIONENFORSCH DARMSTADT MBH,W-6100 DARMSTADT,GERMANY. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP SIMIONOVICI, A (reprint author), CEN,LAB GRENOBLOIS RECH IONS PLASMAS & PHYS ATOM,F-38041 GRENOBLE,FRANCE. RI Indelicato, Paul/D-7636-2011 OI Indelicato, Paul/0000-0003-4668-8958 NR 20 TC 33 Z9 33 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD AUG PY 1993 VL 48 IS 2 BP 1695 EP 1698 DI 10.1103/PhysRevA.48.1695 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LQ990 UT WOS:A1993LQ99000095 ER PT J AU KWIAT, PG STEINBERG, AM CHIAO, RY EBERHARD, PH PETROFF, MD AF KWIAT, PG STEINBERG, AM CHIAO, RY EBERHARD, PH PETROFF, MD TI HIGH-EFFICIENCY SINGLE-PHOTON DETECTORS SO PHYSICAL REVIEW A LA English DT Note ID QUANTUM CRYPTOGRAPHY; BELL THEOREM AB Using correlated photon pairs produced via spontaneous parametric down-conversion, we have measured the absolute single-photon detection efficiencies and time responses of four detectors: two solid-state photomultipliers (SSPM's) manufactured by Rockwell International Corp., and two custom-modified single-photon counting modules (SSPM's) manufactured by EG&G, Canada. The highest observed efficiencies were 70.9+/-1.9% (with an SSPM, at a wavelength of 632 nm) and 76.4+/-2.3% (with an SPCM, at 702 nm). We believe these to be the highest reported single-photon detection efficiencies in the visible spectrum; they are important for quantum cryptography and loophole-free tests of Bell's inequalities, as well as more prosaic applications such as photon correlation spectroscopy and velocimetry. We found that the time profile for coincidences between the SSPM and the SPCM consisted of a main peak with a 3.5-ns full width at half maximum (FWHM) preceded by a smaller peak by 11 ns. A similar time profile between two SPCM's displayed only one peak, with a 300-ps FWHM. Afterpulses were detected in the SPCM's at a level of less than 10(-4) of the counting rate, with an exponential decay time constant of 4.5 mus. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. ROCKWELL INT CORP,ANAHEIM,CA 92803. RP KWIAT, PG (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Steinberg, Aephraim/C-3226-2008 NR 30 TC 63 Z9 65 U1 1 U2 11 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD AUG PY 1993 VL 48 IS 2 BP R867 EP R870 DI 10.1103/PhysRevA.48.R867 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LQ990 UT WOS:A1993LQ99000002 ER PT J AU WALKER, B MEVEL, E YANG, BR BREGER, P CHAMBARET, JP ANTONETTI, A DIMAURO, LF AGOSTINI, P AF WALKER, B MEVEL, E YANG, BR BREGER, P CHAMBARET, JP ANTONETTI, A DIMAURO, LF AGOSTINI, P TI DOUBLE-IONIZATION IN THE PERTURBATIVE AND TUNNELING REGIMES SO PHYSICAL REVIEW A LA English DT Note ID MULTIPHOTON IONIZATION; STATES AB We have studied the doubly charged ion yields and electron energy spectra (normal and coincidence) for double ionization of atoms in two different ionization regimes (perturbative and tunneling). In both cases, the double-ionization rates appear to be anomalously large in some intensity range and strongly reduced by circular polarization. It is argued that these similar behaviors must result from different physical mechanisms. C1 CENS,SERV RECH SURFACES & IRRADIAT MAT,F-91191 GIF SUR YVETTE,FRANCE. ECOLE POLYTECH,ECOLE NATL SUPER TECH AVANCEES,OPT APPL LAB,F-91120 PALAISEAU,FRANCE. RP WALKER, B (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. RI Walker, Barry/F-8532-2011 NR 15 TC 94 Z9 94 U1 0 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD AUG PY 1993 VL 48 IS 2 BP R894 EP R897 DI 10.1103/PhysRevA.48.R894 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LQ990 UT WOS:A1993LQ99000009 ER PT J AU CHOI, Y REE, T REE, FH AF CHOI, Y REE, T REE, FH TI CRYSTAL STABILITY OF HEAVY-RARE-GAS SOLIDS ON THE MELTING LINE SO PHYSICAL REVIEW B LA English DT Article ID HARD-SPHERE FLUID; PERTURBATION-THEORY; REPULSIVE FORCES; ARGON; TRANSITIONS; STATE; XENON AB Contrary to static-energy predictions favoring a hexagonal-close-packed phase, heavy rare gases solidify into a face-centered-cubic phase over a large temperature range. Our recent perturbation theory and hard-sphere radial distribution functions are applied to give a conclusive calculation that agrees with experiment near the melting lines of heavy-rare-gas solids. The observed stability is due to thermal contributions to the Helmholtz free energy which far exceed the opposing static term. The Lennard-Jones potentials used here reproduce melting data of these solids to 1 GPa. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94551 USA. RP KOREA ADV INST SCI & TECHNOL, DEPT CHEM, TAEJON, SOUTH KOREA. NR 30 TC 12 Z9 12 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD AUG 1 PY 1993 VL 48 IS 5 BP 2988 EP 2991 DI 10.1103/PhysRevB.48.2988 PG 4 WC Physics, Condensed Matter SC Physics GA LQ989 UT WOS:A1993LQ98900014 ER PT J AU YONEMITSU, K BISHOP, AR AF YONEMITSU, K BISHOP, AR TI OPTICAL-EXCITATIONS ALONG CUO CHAINS IN COPPER OXIDES SO PHYSICAL REVIEW B LA English DT Article ID SPIN-DENSITY WAVES; PHASE-APPROXIMATION APPROACH; TRANSITION-METAL COMPLEXES; T-J MODELS; HUBBARD-MODEL; MAGNETIC EXCITATIONS; 2-BAND MODEL; CONDUCTIVITY; SPECTRUM; CHARGE AB Optical responses in a one-dimensional two-band Peierls-Hubbard model near 5/8 filling (i.e., near 1/4 filling in the effective one-band model) are studied within inhomogeneous Hartree-Fock and random-phase approximations. Low-energy collective excitations are produced by a sliding motion of a spin-density wave. In the commensurate case (i.e., at 5/8 filling) or near this filling with moderate strength of intersite electron-lattice coupling, the spin-density wave (with polaronic defects in the latter case) is pinned by commensurability with the lattice, and the lowest-frequency optical response lies in the infrared regime. Otherwise, the spin-density wave is incommensurate and moves freely unless it is pinned by extrinsic impurities. Implications for midinfrared absorptions observed in YBa2Cu3O7 and PrBa2Cu3O7 compounds are discussed. With sufficiently weak hopping between the Cu and O sites, a ferromagnetic phase is found. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. NR 29 TC 2 Z9 2 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 1 PY 1993 VL 48 IS 5 BP 3349 EP 3355 DI 10.1103/PhysRevB.48.3349 PG 7 WC Physics, Condensed Matter SC Physics GA LQ989 UT WOS:A1993LQ98900061 ER PT J AU VANDERBEEK, CJ GESHKENBEIN, VB VINOKUR, VM AF VANDERBEEK, CJ GESHKENBEIN, VB VINOKUR, VM TI LINEAR AND NONLINEAR AC RESPONSE IN THE SUPERCONDUCTING MIXED-STATE SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; VORTEX-GLASS SUPERCONDUCTIVITY; BA-CU-O; II SUPERCONDUCTORS; FLUX CREEP; IRREVERSIBILITY LINE; THERMAL FLUCTUATIONS; HARMONIC-GENERATION; PHASE-TRANSITIONS; DEPENDENCE AB The response of the vortex system in the mixed state of type-II superconductors to ac fields is discussed from a unique macroscopic point of view. Linear and nonlinear response are derived as two opposite limits of the same diffusionlike equation for magnetic flux. ac susceptibility experiments carried out in the limit of strong nonlinearity are entirely equivalent to magnetic-relaxation or field-ramp experiments. The magnitude and frequency dependence of the nonlinearity threshold, or amplitude of the ac field where one crosses from essentially linear to strongly nonlinear response, are found and discussed for both the vortex-liquid and vortex-glass states. C1 LD LANDAU THEORET PHYS INST,MOSCOW,RUSSIA. RP VANDERBEEK, CJ (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 50 TC 158 Z9 158 U1 1 U2 11 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 1 PY 1993 VL 48 IS 5 BP 3393 EP 3403 DI 10.1103/PhysRevB.48.3393 PG 11 WC Physics, Condensed Matter SC Physics GA LQ989 UT WOS:A1993LQ98900068 ER PT J AU KAKURAI, K SHAMOTO, S KIYOKURA, T SATO, M TRANQUADA, JM SHIRANE, G AF KAKURAI, K SHAMOTO, S KIYOKURA, T SATO, M TRANQUADA, JM SHIRANE, G TI NEUTRON-SCATTERING STUDY OF MAGNETIC FLUCTUATIONS IN ZN-SUBSTITUTED YBA2CU3O6.6 SO PHYSICAL REVIEW B LA English DT Article ID SUPERCONDUCTORS; SUSCEPTIBILITY; CU; PLANES AB Inelastic-neutron-scattering measurements of magnetic fluctuations in YBa2Cu2.9Zn0.1O6.6 as a function of temperature are presented. In this nonsuperconducting sample magnetic fluctuations at (pi, pi) are observed at all temperatures (10 < T < 200 K) and energies (2 < E < 12 meV) studied in the experiment. This finding should be contrasted to the situation in pure, superconducting YBa2Cu3O6.6, where the low-energy (E < 5 meV) spin fluctuations are suppressed at low temperature leading to gaplike behavior. C1 NAGOYA UNIV,DEPT PHYS,NAGOYA 46401,JAPAN. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP KAKURAI, K (reprint author), UNIV TOKYO,INST SOLID STATE PHYS,ROPPONGI 7-22-1,MINATO KU,TOKYO 106,JAPAN. RI Tranquada, John/A-9832-2009 OI Tranquada, John/0000-0003-4984-8857 NR 28 TC 85 Z9 86 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 1 PY 1993 VL 48 IS 5 BP 3485 EP 3490 DI 10.1103/PhysRevB.48.3485 PG 6 WC Physics, Condensed Matter SC Physics GA LQ989 UT WOS:A1993LQ98900078 ER PT J AU KYCIA, SW GOLDMAN, AI LOGRASSO, TA DELANEY, DW BLACK, D SUTTON, M DUFRESNE, E BRUNING, R RODRICKS, B AF KYCIA, SW GOLDMAN, AI LOGRASSO, TA DELANEY, DW BLACK, D SUTTON, M DUFRESNE, E BRUNING, R RODRICKS, B TI DYNAMICAL X-RAY-DIFFRACTION FROM AN ICOSAHEDRAL QUASI-CRYSTAL SO PHYSICAL REVIEW B LA English DT Note ID AL-CU-RU; MN AB We present direct evidence of dynamical diffraction of x rays from a quasicrystal. High-resolution x-ray-diffraction measurements of the Al-Pd-Mn face-centered icosahedral quasicrystal were performed, revealing a mosaic full width at half maximum of less than 0.001-degrees. In a second experiment, the anomalous transmission of x rays (the Borrmann effect) was observed. These measurements show that nearly perfect quasicrystals may be grown to centimeter-size dimensions allowing x-ray techniques based upon dynamical diffraction to be brought to bear on the analysis of icosahedral structures. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. NBS,GAITHERSBURG,MD 20899. MCGILL UNIV,DEPT PHYS,CTR PHYS MAT,MONTREAL H3A 2T8,QUEBEC,CANADA. ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439. RP KYCIA, SW (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. OI Dufresne, Eric/0000-0002-2077-4754 NR 14 TC 83 Z9 84 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 1 PY 1993 VL 48 IS 5 BP 3544 EP 3547 DI 10.1103/PhysRevB.48.3544 PG 4 WC Physics, Condensed Matter SC Physics GA LQ989 UT WOS:A1993LQ98900091 ER PT J AU VANTHIEL, M REE, FH AF VANTHIEL, M REE, FH TI HIGH-PRESSURE LIQUID-LIQUID PHASE-CHANGE IN CARBON SO PHYSICAL REVIEW B LA English DT Article ID THERMODYNAMIC PROPERTIES; GRAPHITE; TRANSITION; DIAMOND; CONDUCTIVITY; TEMPERATURE; DIAGRAM; METALS; STATE; SI AB The likelihood of a first-order liquid-liquid phase change in carbon from a mostly graphitic configuration to one that is more tetrahedral in character is explored. Liquid-phase changes in other materials are noted. Pertinent data on liquid carbon are reviewed and the model is briefly described. The model is consistent with a positive diamond-melting-line slope. Constraints on the strain energy between graphitic and diamondlike liquid clusters allow a phase diagram with a liquid-liquid transition and a graphite-liquid-liquid triple point. An upper limit on the strain energy is the constraint that the graphite melting line should have a reasonable curvature that agrees with melting-line data. The transformation of liquid structure from graphitic to diamondlike under compression significantly increases the compressibility. RP VANTHIEL, M (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 58 TC 93 Z9 94 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 AUG 1 PY 1993 VL 48 IS 6 BP 3591 EP 3599 DI 10.1103/PhysRevB.48.3591 PG 9 WC Physics, Condensed Matter SC Physics GA LT229 UT WOS:A1993LT22900001 ER PT J AU LEWIS, SP COHEN, ML AF LEWIS, SP COHEN, ML TI THEORETICAL-STUDY OF RAMAN MODES IN HIGH-PRESSURE PHASES OF SI, GE, AND SN SO PHYSICAL REVIEW B LA English DT Article ID STRUCTURAL-PROPERTIES; CRYSTAL STABILITY; HEXAGONAL SILICON; CONDENSED SI; 50 GPA; SUPERCONDUCTIVITY; TRANSITIONS; STATE; TIN; 1ST-PRINCIPLES AB Results of an ab initio investigation of the pressure-dependence of the Raman-active phonon modes in the beta-Sn phase of Si, Ge, and Sn and the hexagonal-close-packed phase of Si are presented. The calculations are in very good agreement with experimental measurements. Both measurements and calculations show that the beta-Sn structure LO mode has a different pressure dependence for Ge than for Si. This difference between Si and Ge is discussed, and an explanation in terms of d electrons is given. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP LEWIS, SP (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 41 TC 23 Z9 25 U1 3 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 1 PY 1993 VL 48 IS 6 BP 3646 EP 3653 DI 10.1103/PhysRevB.48.3646 PG 8 WC Physics, Condensed Matter SC Physics GA LT229 UT WOS:A1993LT22900007 ER PT J AU FISHMAN, RS LIU, SH AF FISHMAN, RS LIU, SH TI FREE-ENERGY AND PHASE-DIAGRAM OF CHROMIUM-ALLOYS SO PHYSICAL REVIEW B LA English DT Article AB The phase diagram of chromium alloys is remarkably rich. At the Neel temperature of 310 K, pure chromium undergoes a weakly first-order phase transition into an incommensurate spin-density wave (SDW) state. When doped with more than 0.2% manganese, this transition becomes second order and the SDW becomes commensurate. Over 25 years ago, Koehler et al. and Komura, Hamaguchi, and Kunitomi observed a first-order commensurate-to-incommensurate (CI) transition in CrMn alloys. The temperature of this CI transition decreased to zero as the manganese concentration increases from about 0.2% to about 1.5%. Using mean-field theory, we have constructed the free energy and phase diagram of chromium alloys in the presence of electron scattering. In the absence of scattering, the phase diagram allows a first-order phase transition from the incommensurate to the commensurate states with decreasing temperature. But if the damping is sufficiently large, the phase-separation curve flips from the right side of the tricritical point to the left. So within a small window of manganese concentrations, the commensurate state undergoes a first-order transition into the incommensurate state with decreasing temperature, in agreement with the experiments of Koehler et al. At zero temperature, we find a first-order phase transition from the incommensurate to the commensurate state with manganese doping, in agreement with the work of Komura, Hamaguchi, and Kunitomi. In the absence of damping, the zero-temperature energy gap DELTA(0) in the commensurate regime is independent of manganese concentration. But in the presence of damping DELTA(0) becomes an increasing function of the manganese concentration. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP FISHMAN, RS (reprint author), N DAKOTA STATE UNIV,DEPT PHYS,FARGO,ND 58105, USA. RI Fishman, Randy/C-8639-2013 NR 15 TC 30 Z9 30 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 1 PY 1993 VL 48 IS 6 BP 3820 EP 3829 DI 10.1103/PhysRevB.48.3820 PG 10 WC Physics, Condensed Matter SC Physics GA LT229 UT WOS:A1993LT22900027 ER PT J AU VLCEK, BM VISWANATHAN, HK FRISCHHERZ, MC FLESHLER, S VANDERVOORT, K DOWNEY, J WELP, U KIRK, MA CRABTREE, GW AF VLCEK, BM VISWANATHAN, HK FRISCHHERZ, MC FLESHLER, S VANDERVOORT, K DOWNEY, J WELP, U KIRK, MA CRABTREE, GW TI ROLE OF POINT-DEFECTS AND THEIR CLUSTERS FOR FLUX-PINNING AS DETERMINED FROM IRRADIATION AND ANNEALING EXPERIMENTS IN YBA2CU3O7-DELTA SINGLE-CRYSTALS SO PHYSICAL REVIEW B LA English DT Article ID NEUTRON-IRRADIATION; ELECTRON-IRRADIATION; CRITICAL CURRENTS; BEAN MODEL AB We present measurements of the magnetization hysteresis on neutron- and proton-irradiated YBa2Cu3O7-delta single crystals. The crystals were irradiated to fluences of 2 X 10(17) n cm-2 (E(n) > 0.1 MeV) and 1 X 10(16) p cm-2 (E(p) = 3.5 MeV), respectively. The magnetization was measured for both field directions. We observed increases of the hysteresis by a factor of 5 at 10 K and 1 T for H parallel-to c for the neutron-irradiated sample and a factor of 9 for the proton-irradiated sample. For H parallel-to ab the hysteresis increased by a factor of 8 and 6, respectively. The irradiated crystals were annealed at 100, 200, and 300-degrees-C in air for 8 h each. The irradiation-induced decrease of T(c) is fully recovered after the final annealing step for both types of irradiation. The magnetization hysteresis for H parallel-to ab decreases almost to its preirradiation level after annealing at 300-degrees-C for both types of irradiation. In contrast, for H parallel-to c, 50% of the initial neutron-irradiation- and 30% of the proton-irradiation-induced enhancements of the magnetization hysteresis are still maintained after the final annealing. The differences in annealing between neutron- and proton-irradiated samples are attributed to the different amount of point defects created by these types of irradiation. C1 ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60438. UNIV VIENNA,INST ATOM,A-1010 VIENNA,AUSTRIA. RP VLCEK, BM (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60438, USA. NR 23 TC 37 Z9 37 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 1 PY 1993 VL 48 IS 6 BP 4067 EP 4073 DI 10.1103/PhysRevB.48.4067 PG 7 WC Physics, Condensed Matter SC Physics GA LT229 UT WOS:A1993LT22900055 ER PT J AU LIU, SH KLEMM, RA AF LIU, SH KLEMM, RA TI INTRALAYER VERSUS INTERLAYER PAIRING IN COPPER-OXIDE SUPERCONDUCTORS - RESPONSE TO MAGNETIC-FIELD SO PHYSICAL REVIEW B LA English DT Article ID ANISOTROPY; YBA2CU3O7; TC; CROSSOVER; FILMS AB We have investigated the response of layered superconductors to an external magnetic field using the semiclassical phase approximation. The linearized gap equations have been derived, and solved numerically to calculate the upper critical field H(c2)(T) for layered superconductors with one or two layers per unit cell for both intralayer s-wave and interlayer BCS-like pairing mechanisms. In the weak-hopping limit the equations reduce to the Lawrence-Doniach form, and for general hopping the appropriate gap equations are derived and numerically analyzed. One encounters the familiar dimensional crossover in the H(c2, parallel-to)(T) curve for weak hopping. A different type of dimensional crossover can occur in the two-layer case with unequal intralayer or interlayer coupling strengths, such that at the crossover temperature, the magnetic field suppresses the superconductivity in the weakly coupled layers while leaving the strongly coupled layers superconducting. The effect is enhanced by unequal hopping strengths. The flux lattice consists of alternating superconducting and normal layers. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP LIU, SH (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 25 TC 9 Z9 9 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 AUG 1 PY 1993 VL 48 IS 6 BP 4080 EP 4094 DI 10.1103/PhysRevB.48.4080 PG 15 WC Physics, Condensed Matter SC Physics GA LT229 UT WOS:A1993LT22900057 ER PT J AU COFFEY, L COFFEY, D AF COFFEY, L COFFEY, D TI QUASI-PARTICLE SPECTRAL WEIGHT OF CUPRATE OXIDE SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Note ID HIGH-TEMPERATURE SUPERCONDUCTIVITY; HIGH-TC SUPERCONDUCTIVITY; BAG MECHANISM; FERMI-LIQUID; STATE; BI2SR2CACU2O8+DELTA; YBA2CU3O7 AB Results are presented for the quasiparticle-spectral-weight function for a two-dimensional tight-binding band in the normal and superconducting states. Comparison is made between s- and d-wave superconducting phases. A quasiparticle damping mechanism, which has been proposed as an explanation for recently observed features in superconducting tunneling experiments, is incorporated, as well as an additional inelastic scattering rate that decreases rapidly upon entering the superconducting state. Comparison is made with recent angle-resolved photoemission spectroscopy. C1 LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP COFFEY, L (reprint author), IIT,DEPT PHYS,CHICAGO,IL 60616, USA. NR 22 TC 10 Z9 10 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 1 PY 1993 VL 48 IS 6 BP 4184 EP 4187 DI 10.1103/PhysRevB.48.4184 PG 4 WC Physics, Condensed Matter SC Physics GA LT229 UT WOS:A1993LT22900078 ER PT J AU WANG, Z SHI, D AF WANG, Z SHI, D TI EFFECT OF FLUX AVALANCHES ON ACTIVATION-ENERGY IN TYPE-II SUPERCONDUCTORS - EVIDENCE FOR SELF-ORGANIZED CRITICALITY SO PHYSICAL REVIEW B LA English DT Note ID CURRENT-DENSITY; DEPENDENCE; CREEP AB The behavior of thermally activated flux avalanches is studied for both high-T(c) superconductors (single crystals of Bi2Sr2CaCu2Ox and YBa2Cu3Ox) and a conventional type-II superconductor (Nb3Sn multifilamentary wire). By combining two different mechanisms, namely, thermally activated and avalanche flux motion, we have developed a U(j) relationship in a large regime of driving force for type-II superconductors. As a result of flux avalanches, the flux-motion activation energy is considerably reduced. We have found a dynamic crossover at which the flux-motion characteristic changes from spatially and temporally correlated flux avalanches to slow creep. C1 IIT, DEPT PHYS, CHICAGO, IL 60616 USA. RP ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. NR 18 TC 18 Z9 21 U1 1 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD AUG 1 PY 1993 VL 48 IS 6 BP 4208 EP 4211 DI 10.1103/PhysRevB.48.4208 PG 4 WC Physics, Condensed Matter SC Physics GA LT229 UT WOS:A1993LT22900084 ER PT J AU SIMON, P BASSAT, JM OSEROFF, SB FISK, Z CHEONG, SW WATTIAUX, A SCHULTZ, S AF SIMON, P BASSAT, JM OSEROFF, SB FISK, Z CHEONG, SW WATTIAUX, A SCHULTZ, S TI ABSENCE OF CU2+ ELECTRON-SPIN-RESONANCE IN HIGH-TEMPERATURE SUPERCONDUCTORS AND RELATED INSULATORS UP TO 1150 K SO PHYSICAL REVIEW B LA English DT Note ID HIGH-TC SUPERCONDUCTORS; VALENCE-BOND STATE; PARAMAGNETIC-RES; LA2CUO4; ANTIFERROMAGNET; RELAXATION; EXCHANGE; DYNAMICS AB One unresolved question in the high-temperature superconductors and their copper oxide parent compounds is the absence of a Cu2+ electron-spin-resonance (ESR) signal even at temperatures well above the Neel temperature. We have extended the measurements up to 1150 K in both single crystals and ceramic pellets of La2CuO4+delta, 0 less than or similar to delta less than or similar to 0.12, and no ESR signal has been observed. Our data are not compatible with the models based only on magnetic fluctuations which predict an ESR linewidth of a few hundred Oe at such high temperatures. Other suggested explanations for the absence of a Cu2+ ESR signal are discussed. C1 SAN DIEGO STATE UNIV,DEPT PHYS,SAN DIEGO,CA 92182. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. AT&T BELL LABS,MURRAY HILL,NJ 07974. UNIV BORDEAUX 1,CNRS,CHIM SOLIDE LAB,F-33405 TALENCE,FRANCE. UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. RP SIMON, P (reprint author), CNRS,CTR RECH PHYS SOLIDES,F-45071 ORLEANS 2,FRANCE. RI Simon, Patrick/C-1688-2008 NR 34 TC 52 Z9 52 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 1 PY 1993 VL 48 IS 6 BP 4216 EP 4218 DI 10.1103/PhysRevB.48.4216 PG 3 WC Physics, Condensed Matter SC Physics GA LT229 UT WOS:A1993LT22900086 ER PT J AU BARNES, T CAPSTICK, S KOVARIK, MD SWANSON, ES AF BARNES, T CAPSTICK, S KOVARIK, MD SWANSON, ES TI NN CORE INTERACTIONS AND DIFFERENTIAL CROSS-SECTIONS FROM ONE GLUON EXCHANGE SO PHYSICAL REVIEW C LA English DT Article ID NUCLEON-NUCLEON-INTERACTION; RELATIVIZED QUARK-MODEL; PERTURBATIVE QUANTUM CHROMODYNAMICS; LARGE-MOMENTUM-TRANSFER; MESON-MESON SCATTERING; SHORT-RANGE PART; ELASTIC-SCATTERING; DIBARYON RESONANCES; EXCLUSIVE PROCESSES; POTENTIAL MODEL AB We derive nonstrange baryon-baryon scattering amplitudes in the nonrelativistic quark model using the ''quark Born diagram'' formalism. This approach describes the scattering as a single interaction, here the one-gluon-exchange (OGE) spin-spin term followed by constituent interchange, with external nonrelativistic baryon wave functions attached to the scattering diagrams to incorporate higher-twist wave-function effects. The short-range repulsive core in the NN interaction has previously been attributed to this spin-spin interaction in the literature; we find that these perturbative constituent-interchange diagrams do indeed predict repulsive interactions in all I, S channels of the nucleon-nucleon system, and we compare our results for the equivalent short-range potentials to the core potentials found by other authors using nonperturbative methods. We also apply our perturbative techniques to the NDELTA and DELTADELTA systems: Some DELTADELTA channels are found to have attractive core potentials and may accommodate ''molecular'' bound states near threshold. Finally we use our Born formalism to calculate the NN differential cross section, which we compare with experimental results for unpolarized proton-proton elastic scattering. We find that several familiar features of the experimental differential cross section are reproduced by our Born-order result. C1 OAK RIDGE NATL LAB, CTR COMPUTAT INTENS PHYS, OAK RIDGE, TN 37831 USA. UNIV TENNESSEE, DEPT PHYS, KNOXVILLE, TN 37996 USA. CONTINUOUS ELECTRON BEAM ACCELERATOR FACIL, NEWPORT NEWS, VA 23606 USA. OAK RIDGE NATL LAB, CTR COMPUTAT INTENS PHYS, OAK RIDGE, TN 37831 USA. OAK RIDGE NATL LAB, DIV PHYS, OAK RIDGE, TN 37831 USA. MIT, CTR HYG & MICROBIOL, CAMBRIDGE, MA 02139 USA. MIT, NUCL SCI LAB, CTR THEORET PHYS, CAMBRIDGE, MA 02139 USA. RP BARNES, T (reprint author), OAK RIDGE NATL LAB, DIV PHYS, OAK RIDGE, TN 37831 USA. NR 85 TC 48 Z9 48 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 EI 1089-490X J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1993 VL 48 IS 2 BP 539 EP 552 DI 10.1103/PhysRevC.48.539 PG 14 WC Physics, Nuclear SC Physics GA LT233 UT WOS:A1993LT23300014 ER PT J AU MOXON, MC HARVEY, JA RAMAN, S LYNN, JE RATYNSKI, W AF MOXON, MC HARVEY, JA RAMAN, S LYNN, JE RATYNSKI, W TI NEUTRON RESONANCE PARAMETERS AND THERMAL-NEUTRON CAPTURE BY CA-43 SO PHYSICAL REVIEW C LA English DT Article ID GAMMA-RAYS; ISOTOPES AB Neutron transmission measurements have been carried out on a small sample (205.9 mg) of CaCO3 with a Ca-43 enrichment of 49.1%. The parameters (spins and neutron widths) of eight resonances below the neutron energy of 20 keV have been determined. This information was combined with a previously measured thermal-neutron coherent scattering length to deduce the separate scattering lengths for the two spin states present in s-wave scattering. These values were used to calculate the direct (potential + valence) capture cross sections of the primary electric-dipole gamma transitions in Ca-44 using optical-model potentials with physically realistic parameters. For those states below 6.2 MeV for which the l = 1 (d,p) spectroscopic factors are known, the experimental cross sections are consistent with our current understanding of the direct and compound-nuclear capture processes. The processes leading to states above 6.2 MeV require further experimental and theoretical studies. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. SOLTAN INST NUCL PHYS,OTWOCK,POLAND. RP MOXON, MC (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 19 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 AUG PY 1993 VL 48 IS 2 BP 553 EP 561 DI 10.1103/PhysRevC.48.553 PG 9 WC Physics, Nuclear SC Physics GA LT233 UT WOS:A1993LT23300015 ER PT J AU WOLF, A GILL, RL BRENNER, DS BERANT, Z SCHUHMANN, RB ZAMFIR, NV AF WOLF, A GILL, RL BRENNER, DS BERANT, Z SCHUHMANN, RB ZAMFIR, NV TI G-FACTOR OF THE 3/2+ 93.6 KEV LEVEL IN SR-91 SO PHYSICAL REVIEW C LA English DT Article ID MOMENTS; STATES AB The g factor of the first excited, 3/2+, 93.6 keV level of Sr-91 was measured using a beam of separated fission products and the time-differential perturbed angular correlation method. The result, g(3/2+) = -0.231(11), is discussed in the context of the systematics of g factors of N = 53-57 isotones, and found to be in good agreement with the prediction of the core-excitation model. C1 INST ATOM PHYS,BUCHAREST,ROMANIA. CLARK UNIV,WORCESTER,MA 01610. NUCL RES CTR NEGEV,IL-84190 BEER SHEVA,ISRAEL. RP WOLF, A (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Zamfir, Nicolae Victor/F-2544-2011 NR 17 TC 3 Z9 3 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1993 VL 48 IS 2 BP 562 EP 565 DI 10.1103/PhysRevC.48.562 PG 4 WC Physics, Nuclear SC Physics GA LT233 UT WOS:A1993LT23300016 ER PT J AU ARYAEINEJAD, R COLE, JD GREENWOOD, RC HARRILL, SS LOHSTRETER, NP BUTLERMOORE, K ZHU, S HAMILTON, JH RAMAYYA, AV ZHAO, X MA, WC LEE, IY JOHNSON, NR MCGOWAN, FK TERAKOPIAN, G OGANESSIAN, Y AF ARYAEINEJAD, R COLE, JD GREENWOOD, RC HARRILL, SS LOHSTRETER, NP BUTLERMOORE, K ZHU, S HAMILTON, JH RAMAYYA, AV ZHAO, X MA, WC LEE, IY JOHNSON, NR MCGOWAN, FK TERAKOPIAN, G OGANESSIAN, Y TI BAND CROSSING OBSERVED IN NEUTRON-RICH PD ISOTOPES VIA SPONTANEOUS FISSION OF CF-252 SO PHYSICAL REVIEW C LA English DT Article ID INTERACTING BOSON MODEL; ROTATIONAL BANDS; NUCLEI; REGION; STATES; DEFORMATION; CHARGE; SHAPES; LIMIT; SPIN AB High spin excited states in neutron-rich nuclei Pd-112, Pd-114, Pd-116 have been investigated by measuring prompt gamma rays emitted from a Cf-252 spontaneous fission source. Two different measurements were performed. First, gamma-gamma coincidence data, necessary to determine the decay schemes, were obtained by using an array of 20 Compton-suppressed Ge detectors. Second, Z identification and the enhancement of a desired neutron channel were carried out using a x-n-gamma multiplicity spectrometer. Ground state bands have been extended to J(pi) = 10+ for 112Pd, and J(pi) = 12+ for 114Pd and 116Pd. Band crossings were observed in all three isotopes. It was found from cranked shell model calculations that these backbends are due to the alignment of two g9/2 protons. The measured energy levels were also compared with predictions of the interacting boson model. C1 VANDERBILT UNIV,DEPT PHYS,NASHVILLE,TN 37235. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. DUBNA JOINT NUCL RES INST,GN FLEROV LAB NUCL REACT,DUBNA,RUSSIA. MT ST MARY ACAD,LITTLE ROCK,AR 72205. N GARLAND HIGH SCH,GARLAND,TX 75042. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP ARYAEINEJAD, R (reprint author), IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 37 TC 46 Z9 46 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1993 VL 48 IS 2 BP 566 EP 573 DI 10.1103/PhysRevC.48.566 PG 8 WC Physics, Nuclear SC Physics GA LT233 UT WOS:A1993LT23300017 ER PT J AU MUSTAFA, MG BLANN, M IGNATYUK, AV AF MUSTAFA, MG BLANN, M IGNATYUK, AV TI REALISTIC LEVEL DENSITIES IN FRAGMENT EMISSION AT HIGH-EXCITATION ENERGIES SO PHYSICAL REVIEW C LA English DT Article ID PRECOMPOUND DECAY; MULTIFRAGMENTATION AB Heavy fragment emission from a Ru-100(44) compound nucleus at 400 and 800 MeV of excitation is analyzed to study the influence of level density models on final yields. An approach is used in which only quasibound shell-model levels are included in calculating level densities. We also test the traditional Fermi gas model for which there is no upper energy limit to the single particle levels. We compare the influence of these two level density models in evaporation calculations of primary fragment excitations, kinetic energies and yields, and on final product yields. C1 PHYS & POWER ENGN INST,OBNINSK,RUSSIA. RP MUSTAFA, MG (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 15 TC 3 Z9 3 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1993 VL 48 IS 2 BP 588 EP 592 DI 10.1103/PhysRevC.48.588 PG 5 WC Physics, Nuclear SC Physics GA LT233 UT WOS:A1993LT23300021 ER PT J AU HE, YD PRICE, PB AF HE, YD PRICE, PB TI SEARCH FOR ABNORMAL-NUCLEUS PRODUCTION IN HEAVY-ION COLLISIONS SO PHYSICAL REVIEW C LA English DT Article ID CHARGE PICKUP AB In 1.0 X 10(9) collisions of 11.4 A GeV Au-197 on a 1.27-cm Pb target we found no nuclear products with charge > 84 emitted within an angle of 140 mrad to the beam direction, allowing us to set an upper limit of 20 nb on the production cross section at 90% confidence level for abnormal nuclei with lifetime greater-than-or-equal-to 10(-9) s. C1 LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP HE, YD (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 13 TC 4 Z9 4 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1993 VL 48 IS 2 BP 647 EP 650 DI 10.1103/PhysRevC.48.647 PG 4 WC Physics, Nuclear SC Physics GA LT233 UT WOS:A1993LT23300030 ER PT J AU SIMON, AJ GLASS, G MCNAUGHTON, MW NORO, T MCNAUGHTON, KH RILEY, PJ GULMEZ, E WHITTEN, CA CUPPS, VR RANSOME, RD ADAMS, DL AF SIMON, AJ GLASS, G MCNAUGHTON, MW NORO, T MCNAUGHTON, KH RILEY, PJ GULMEZ, E WHITTEN, CA CUPPS, VR RANSOME, RD ADAMS, DL TI ABSOLUTE PP-ELASTIC CROSS-SECTIONS FROM 492 TO 793 MEV SO PHYSICAL REVIEW C LA English DT Article ID NUCLEAR INTERFERENCE REGION; ENERGY-DEPENDENCE; ANALYZING POWERS; SCATTERING; FORMALISM; RANGE; GEV/C AB Absolute pp-elastic-differential cross sections were measured at incident energies 492, 576, 642, 728, and 793 MeV from about 30-degrees to 90-degrees c.m. The total uncertainty was determined to be less than 1%, made possible by particle counting for beam normalization and extensive cross-checks of systematic effects. These new data are consistent with previous data above 600 MeV but have uncertainties about a factor of 10 smaller. Near 500 MeV these data are consistent with 90-degrees data from TRIUMF, but differ significantly from similar data from PSI; the cause of this discrepancy is discussed. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV TEXAS,AUSTIN,TX 78712. UNIV TEXAS,AUSTIN,TX 78712. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. RUTGERS UNIV,NEW BRUNSWICK,NJ 08903. RICE UNIV,HOUSTON,TX 77251. RP SIMON, AJ (reprint author), TEXAS A&M UNIV SYST,COLL STN,TX 77843, USA. RI Gulmez, Erhan/P-9518-2015 OI Gulmez, Erhan/0000-0002-6353-518X NR 52 TC 14 Z9 14 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1993 VL 48 IS 2 BP 662 EP 675 DI 10.1103/PhysRevC.48.662 PG 14 WC Physics, Nuclear SC Physics GA LT233 UT WOS:A1993LT23300032 ER PT J AU SCHWARZ, C GONG, WG CARLIN, N GELBKE, CK KIM, YD LYNCH, WG MURAKAMI, T POGGI, G DESOUZA, RT TSANG, MB XU, HM FIELDS, DE KWIATKOWSKI, K VIOLA, VE YENNELLO, SJ AF SCHWARZ, C GONG, WG CARLIN, N GELBKE, CK KIM, YD LYNCH, WG MURAKAMI, T POGGI, G DESOUZA, RT TSANG, MB XU, HM FIELDS, DE KWIATKOWSKI, K VIOLA, VE YENNELLO, SJ TI EMISSION TEMPERATURES FROM WIDELY SEPARATED STATES IN N-14-INDUCED AND XE-129-INDUCED REACTIONS SO PHYSICAL REVIEW C LA English DT Article ID NONEQUILIBRIUM LIGHT PARTICLES; INTERMEDIATE-MASS FRAGMENTS; NUCLEUS NUCLEUS COLLISIONS; AR-40 INDUCED REACTIONS; HEAVY-ION COLLISIONS; HOT NUCLEI; EXCITATION-ENERGY; COMPLEX FRAGMENTS; UNBOUND STATES; 2-PARTICLE CORRELATIONS AB Charged-particle correlations were measured for the reactions N-14 + Au-197 and N-14+ Al-27 at E/A = 75 MeV and for Xe-129 + Al-27 and Xe-129 + Sn-122 at E/A = 31 MeV. Relative populations of widely separated states in He-4, Li-5, and Be-8, only weakly affected by side feeding, indicate emission temperatures of T = 4-5 MeV for the N-14-induced reactions and values about 1 MeV lower for the Xe-129-induced reactions. C1 LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. MICHIGAN STATE UNIV,DEPT PHYS & ASTRON,E LANSING,MI 48824. INDIANA UNIV,DEPT CHEM,BLOOMINGTON,IN 47405. INDIANA UNIV,CYCLOTRON FACIL,BLOOMINGTON,IN 47405. RP SCHWARZ, C (reprint author), MICHIGAN STATE UNIV,NATL SUPERCONDUCTING CYCLOTRON LAB,E LANSING,MI 48824, USA. RI Carlin Filho, Nelson/C-2187-2012; Lynch, William/I-1447-2013; Yennello, Sherry/B-5803-2015; deSouza, Romualdo/P-5862-2015 OI Lynch, William/0000-0003-4503-176X; Yennello, Sherry/0000-0003-3963-5217; deSouza, Romualdo/0000-0001-5835-677X NR 78 TC 31 Z9 32 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1993 VL 48 IS 2 BP 676 EP 687 DI 10.1103/PhysRevC.48.676 PG 12 WC Physics, Nuclear SC Physics GA LT233 UT WOS:A1993LT23300033 ER PT J AU CHAVEZLOMELI, E DACAL, A ORTIZ, ME GAZES, SB CHAN, Y STOKSTAD, RG PLAGNOL, E SIWEKWILCZYNSKA, K WILCZYNSKI, J AF CHAVEZLOMELI, E DACAL, A ORTIZ, ME GAZES, SB CHAN, Y STOKSTAD, RG PLAGNOL, E SIWEKWILCZYNSKA, K WILCZYNSKI, J TI O-16 BREAKUP IN QUASI-ELASTIC REACTIONS NEAR THE FERMI ENERGY SO PHYSICAL REVIEW C LA English DT Article ID PHOSWICH DETECTOR; HEAVY-IONS; COLLISIONS; NE-20+AU-197; NUCLEON; 11-MEV; PICKUP; LI-7 AB The quasielastic breakup of an O-16 nucleus at 32.5 MeV/nucleon on a Au-197 target has been investigated by measuring the projectilelike fragments in coincidence with the emitted light charged particles. It is found that the breakup proceeds via sequential, two-step processes in which inelastic scattering and one-neutron pickup are the most significant components in the formation of the primary fragment. This is followed by statistical decay of the highly excited primary fragment. A Monte Carlo simulation was used to identify these processes and to deduce differential and total cross sections for the breakup of O-16 into the alpha + C-12, C-13 channels. C1 UNIV ROCHESTER,NUCL STRUCT RES LAB,ROCHESTER,NY 14627. LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. GRAND ACCELERATEUR NATL IONS LOURDS,F-14021 CAEN,FRANCE. UNIV WARSAW,INST EXPTL PHYS,PL-00681 WARSAW,POLAND. INST NUCL STUDIES,PL-05400 OTWOCK,POLAND. RP CHAVEZLOMELI, E (reprint author), NATL AUTONOMOUS UNIV MEXICO,INST FIS,AP 20-364,DEL A OBREGON,MEXICO CITY 04510,DF,MEXICO. NR 19 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1993 VL 48 IS 2 BP 699 EP 710 DI 10.1103/PhysRevC.48.699 PG 12 WC Physics, Nuclear SC Physics GA LT233 UT WOS:A1993LT23300035 ER PT J AU PARK, BK RAPAPORT, J FINK, G ULLMANN, JL LING, AG SORENSON, DS BRADY, FP ROMERO, JL HOWELL, CR TORNOW, W UNKELBACH, W AF PARK, BK RAPAPORT, J FINK, G ULLMANN, JL LING, AG SORENSON, DS BRADY, FP ROMERO, JL HOWELL, CR TORNOW, W UNKELBACH, W TI ENERGY-DEPENDENCE OF MULTIPOLE STRENGTH DISTRIBUTIONS IN THE S-32(N,P)P-32 REACTION SO PHYSICAL REVIEW C LA English DT Article ID GAMOW-TELLER STRENGTH; ELECTRIC ISOVECTOR RESONANCES; SD-SHELL NUCLEI; BETA-DECAY; MATRIX-ELEMENTS; CROSS-SECTIONS; EXCITATIONS; SCATTERING; SPIN; N,P AB Double differential cross-section angular distributions were measured for the S-32(n,p)P-31 charge exchange reaction in the 0-degrees less-than-or-equal-to theta(lab) less-than-or-equal-to 14-degrees angular range. All data presented here were measured simultaneously covering incident neutron energies between 60 and 220 MeV using the white neutron source at Los Alamos Meson Physics Facility-Weapons Neutron Research. The Gamow-Teller strengths obtained from a multipole decomposition analysis of these S-32(n,p)P-32 data are compared to previously reported S-32(p, n)Cl-32 results as well as to calculated Gamow-Teller strengths obtained using the shell-model code OXBASH and random phase approximation (RPA) calculations. The resultant giant dipole and giant spin-dipole cross sections obtained from this multipole decomposition analysis are also compared with distorted-wave impulse approximations calculated with densities obtained from a simple one-particle-one-hole shell model and also densities obtained from RPA calculations. C1 NEW MEXICO STATE UNIV,LAS CRUCES,NM 88003. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV CALIF DAVIS,DAVIS,CA 95616. TRIANGLE UNIV,NUCL LAB,DURHAM,NC 27706. DUKE UNIV,DURHAM,NC 27706. INDIANA UNIV,CTR NUCL THEORRY,GARY,IN 46408. RP PARK, BK (reprint author), OHIO UNIV,ATHENS,OH 45701, USA. NR 59 TC 4 Z9 4 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1993 VL 48 IS 2 BP 711 EP 722 DI 10.1103/PhysRevC.48.711 PG 12 WC Physics, Nuclear SC Physics GA LT233 UT WOS:A1993LT23300036 ER PT J AU HANOLD, K MORETTO, LG PEASLEE, GF WOZNIAK, GJ BOWMAN, DR MOHAR, MF MORRISSEY, DJ AF HANOLD, K MORETTO, LG PEASLEE, GF WOZNIAK, GJ BOWMAN, DR MOHAR, MF MORRISSEY, DJ TI TRANSITION FROM COMPLETE TO INCOMPLETE FUSION IN ASYMMETRIC HEAVY-ION REACTIONS SO PHYSICAL REVIEW C LA English DT Article ID INTERMEDIATE-MASS FRAGMENTS; COMPOUND-NUCLEUS DECAY; EXCITATION-FUNCTIONS; MULTIFRAGMENT PRODUCTION; E/A=27 MEV; EMISSION; COLLISIONS; AG; AL-27; C-12 AB Complex fragments with atomic numbers between those of the target and the projectile have been detected from the reactions of 26 and 31 MeV/nucleon Xe-129 + C, Al, Ti, and Cu. Angular distributions, cross sections, and velocity spectra of these fragments were extracted from the inclusive data. The velocity of the emitting source and Z-total distributions were reconstructed from the twofold coincidence data. These results are used to characterize the emission source of the complex fragments. The results are compared to a geometric incomplete fusion model calculation. Agreement between the model and the data is good. C1 MICHIGAN STATE UNIV,NATL SUPERCONDUCT CYCLOTRON LAB,E LANSING,MI 48824. RP HANOLD, K (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 43 TC 9 Z9 9 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1993 VL 48 IS 2 BP 723 EP 734 DI 10.1103/PhysRevC.48.723 PG 12 WC Physics, Nuclear SC Physics GA LT233 UT WOS:A1993LT23300037 ER PT J AU GARVEY, GT LOUIS, WC WHITE, DH AF GARVEY, GT LOUIS, WC WHITE, DH TI DETERMINATION OF PROTON STRANGE FORM-FACTORS FROM VP ELASTIC-SCATTERING SO PHYSICAL REVIEW C LA English DT Article ID NEUTRAL-CURRENT; POLARIZED PROTONS; SPIN; G1 AB A previous vp elastic scattering experiment at BNL is reanalyzed, taking into account the strange vector and axial-vector form factors of the proton F-1(s), F-2(s), and G-1(s). Values for these form factors are obtained, although with large errors due to correlations between F-1(s) and F-2(2) and between G-1(s) and the axial vector dipole mass M(A). Future vp elastic scattering experiments could significantly improve the knowledge of these form factors. RP GARVEY, GT (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 24 TC 125 Z9 125 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1993 VL 48 IS 2 BP 761 EP 765 DI 10.1103/PhysRevC.48.761 PG 5 WC Physics, Nuclear SC Physics GA LT233 UT WOS:A1993LT23300041 ER PT J AU CHEN, CM ERNST, DJ JOHNSON, MB AF CHEN, CM ERNST, DJ JOHNSON, MB TI HIGH-ENERGY PION-NUCLEUS ELASTIC-SCATTERING SO PHYSICAL REVIEW C LA English DT Article ID CHARGE-EXCHANGE; DELTA-(1232) RESONANCE; 3,3 RESONANCE; 800 MEV/C; MODEL; WAVE; K+ AB We investigate theoretical approaches to pion-nucleus elastic scattering at high energies (300 less-than-or-equal-to T(pi) less-than-or-equal-to 1 GeV). A ''model-exact'' calculation of the lowest-order microscopic optical model, carried out in momentum space and including the full Fermi averaging integration, a realistic off-shell pion-nucleon-scattering amplitude and fully covariant kinematics, is used to calibrate a much simpler theory. The simpler theory utilizes a local optical potential with an eikonal propagator and includes the Coulomb interaction and the first Wallace correction, both of which are found to be important. Comparisons of differential cross sections out to beyond the second minimum are made for light and heavy nuclei. Particularly for nuclei as heavy as Ca-40, the eikonal theory is found to be an excellent approximation to the full theory. C1 TEXAS A&M UNIV SYST,DEPT PHYS,COLL STN,TX 77843. TEXAS A&M UNIV SYST,CTR THEORET PHYS,COLL STN,TX 77843. VANDERBILT UNIV,DEPT PHYS & ASTRON,NASHVILLE,TN 37235. RP CHEN, CM (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 38 TC 31 Z9 33 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1993 VL 48 IS 2 BP 841 EP 849 DI 10.1103/PhysRevC.48.841 PG 9 WC Physics, Nuclear SC Physics GA LT233 UT WOS:A1993LT23300049 ER PT J AU LUKE, SJ VANDENBOSCH, R RANDRUP, J AF LUKE, SJ VANDENBOSCH, R RANDRUP, J TI REFINEMENTS OF THE NUCLEON-EXCHANGE TRANSPORT MODEL FOR THE EMISSION OF HARD PHOTONS AND NUCLEONS SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION COLLISIONS; GAMMA-RAY PRODUCTION; IMPACT PARAMETER DEPENDENCE; PROMPTLY EMITTED PARTICLES; FUSION-LIKE PROCESSES; 30 MEV NUCLEON; INCOMPLETE FUSION; PROTON-NUCLEUS; ANGULAR-MOMENTUM; LIGHT PARTICLES AB A previously developed nucleon-exchange transport model for preequilibrium neutron and hard photon emission is extended to include proton emission. Several refinements including diffuse ground-state nucleonic momentum distributions and quantal rather than classical bremsstrahlung production are added. The incorporation of a diffuse momentum distribution improves the reproduction of experimental spectra and multiplicities, particularly at low bombarding energies. Quantal bremsstrahlung enhances the production of high-energy photons. The effect of deceleration of the colliding nuclei during the propagation of the jetting particles through the receptor nucleus is explored. The effect of preequilibrium emission on the evaporation residue and its dependence on entrance channel mass asymmetry is studied. The number of preequilibrium particles emitted is inconsistent with some previous analyses of evaporation residue spectra. C1 UNIV WASHINGTON, NUCL PHYS LAB, GL-10, SEATTLE, WA 98195 USA. RP LUKE, SJ (reprint author), LAWRENCE LIVERMORE NATL LAB, LAWRENCE LIVERMORE NATL LAB, DIV N, L-397, LIVERMORE, CA 94551 USA. NR 48 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 AUG PY 1993 VL 48 IS 2 BP 857 EP 869 DI 10.1103/PhysRevC.48.857 PG 13 WC Physics, Nuclear SC Physics GA LT233 UT WOS:A1993LT23300051 ER PT J AU GLENDENNING, NK VONEIFF, D HAFT, M LENSKE, H WEIGEL, MK AF GLENDENNING, NK VONEIFF, D HAFT, M LENSKE, H WEIGEL, MK TI RELATIVISTIC MEAN-FIELD CALCULATIONS OF DELTA AND SIGMA HYPERNUCLEI SO PHYSICAL REVIEW C LA English DT Article ID NEUTRON-STARS; LAMBDA-HYPERNUCLEI; FINITE NUCLEI; EQUATION; MODEL AB Single-particle spectra of LAMBDA and SIGMA hypernuclei are calculated within a relativistic mean-field theory. The hyperon couplings used are compatible with the LAMBDA binding in saturated nuclear matter, neutron-star masses, and experimental data on LAMBDA levels in hypernuclei. The spin-orbit potentials for the hyperons and the influence of the rho-meson field (isospin dependent interaction) are discussed. C1 UNIV MUNICH,PHYS SECT,W-8000 MUNICH 2,GERMANY. RP GLENDENNING, NK (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 30 TC 58 Z9 60 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1993 VL 48 IS 2 BP 889 EP 895 DI 10.1103/PhysRevC.48.889 PG 7 WC Physics, Nuclear SC Physics GA LT233 UT WOS:A1993LT23300054 ER PT J AU WONG, CY AF WONG, CY TI EFFECTS OF BOUNDARY ON MOMENTUM DISTRIBUTION OF QUARKS IN A QUARK-GLUON PLASMA SO PHYSICAL REVIEW C LA English DT Article ID DILEPTON EMISSION; PAIR CREATION; FLUX TUBE AB The boundary of a quark-gluon plasma affects the momentum distribution of quarks and consequently the magnitudes of signals for the search of the quark-gluon plasma. RP WONG, CY (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. OI Wong, Cheuk-Yin/0000-0001-8223-0659 NR 14 TC 16 Z9 16 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1993 VL 48 IS 2 BP 902 EP 905 DI 10.1103/PhysRevC.48.902 PG 4 WC Physics, Nuclear SC Physics GA LT233 UT WOS:A1993LT23300056 ER PT J AU XU, HM NATOWITZ, JB GAGLIARDI, CA TRIBBLE, RE WONG, CY LYNCH, WG AF XU, HM NATOWITZ, JB GAGLIARDI, CA TRIBBLE, RE WONG, CY LYNCH, WG TI FORMATION AND DECAY OF TOROIDAL AND BUBBLE NUCLEI AND THE NUCLEAR-EQUATION OF STATE SO PHYSICAL REVIEW C LA English DT Note ID HEAVY-ION COLLISIONS; MULTIFRAGMENT EMISSION; DISAPPEARANCE; HOT; FRAGMENTATION; DYNAMICS; MATTER; FLOW AB Multifragmentation, following the formation of toroidal and bubble nuclei, is observed with an improved Boltzmann-Uehling-Uhlenbeck model for central Mo-92 + Mo-92 collisions. With a stiff equation of state, simultaneous explosion into several nearly equal fragments in a ringlike manner occurs due to the formation of metastable toroidal nuclei. In contrast, with a soft equation of state, simultaneous explosion into several nearly equal fragments in a volumelike manner occurs due to the formation of metastable bubble nuclei. Experimental signatures for the formation of these exotic shapes are discussed. C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. MICHIGAN STATE UNIV,NATL SUPERCONDUCTING CYCLOTRON LAB,E LANSING,MI 48824. RP XU, HM (reprint author), TEXAS A&M UNIV SYST,INST CYCLOTRON,COLL STN,TX 77843, USA. RI Lynch, William/I-1447-2013; Natowitz, Joseph/D-4160-2015; OI Lynch, William/0000-0003-4503-176X; Wong, Cheuk-Yin/0000-0001-8223-0659 NR 34 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1993 VL 48 IS 2 BP 933 EP 936 DI 10.1103/PhysRevC.48.933 PG 4 WC Physics, Nuclear SC Physics GA LT233 UT WOS:A1993LT23300065 ER PT J AU WILLSAU, P HUBEL, H DIAMOND, RM DELEPLANQUE, MA MACCHIAVELLI, AO OLIVEIRA, JR STEPHENS, FS KLUGE, H BECKER, JA HENRY, EA KUHNERT, A STOYER, M AF WILLSAU, P HUBEL, H DIAMOND, RM DELEPLANQUE, MA MACCHIAVELLI, AO OLIVEIRA, JR STEPHENS, FS KLUGE, H BECKER, JA HENRY, EA KUHNERT, A STOYER, M TI LIFETIMES OF THE DECAY FROM SUPERDEFORMED TO NORMAL DEFORMED IN ND-135 SO PHYSICAL REVIEW C LA English DT Note ID QUADRUPOLE-MOMENT; 2ND MINIMUM; BAND AB Lifetimes of low-spin members of the superdeformed band in 135Nd have been determined by the Doppler-shift recoil-distance method. We find a quadrupole moment of 7.2(+1.2\-1.5) b for the 677 keV (37/2 - 33/2) transition in the band, confirming the large deformation previously measured by the Doppler-shift attenuation method. However, the quadrupole moment for the 620 keV transition deexciting the 3.324 MeV (25/2) state at the bottom of the band is much smaller. We conclude that the superdeformed potential-energy minimum disappears or the band drastically changes character at this point which causes the sudden depopulation. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. HAHN MEITNER INST BERLIN GMBH,W-1000 BERLIN 39,GERMANY. RP WILLSAU, P (reprint author), UNIV BONN,INST STRAHLEN & KERNPHYS,NUSSALLEE 14-16,W-5300 BONN,GERMANY. RI Oliveira, Jose Roberto/J-3124-2012 OI Oliveira, Jose Roberto/0000-0003-1362-7382 NR 12 TC 13 Z9 13 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD AUG PY 1993 VL 48 IS 2 BP R494 EP R497 DI 10.1103/PhysRevC.48.R494 PG 4 WC Physics, Nuclear SC Physics GA LT233 UT WOS:A1993LT23300003 ER PT J AU ALEXOPOULOS, T ALLEN, C ANDERSON, EW BALAMURALI, V BANERJEE, S BEERY, PD BHAT, P BISHOP, JM BISWAS, NN BUJAK, A CARMONY, DD CARTER, T CHOI, Y COLE, P DEBONTE, R DECARLO, V ERWIN, AR 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 REEVES, D RIMAI, A ROBERTSON, WJ SCHARENBERG, RP STAMPKE, SR STRINGFELLOW, BC 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 BISHOP, JM BISWAS, NN BUJAK, A CARMONY, DD CARTER, T CHOI, Y COLE, P DEBONTE, R DECARLO, V ERWIN, AR 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 REEVES, D RIMAI, A ROBERTSON, WJ SCHARENBERG, RP STAMPKE, SR STRINGFELLOW, BC THOMPSON, M TURKOT, F WALKER, WD WANG, CH WARCHOL, J WESSON, DK ZHAN, Y TI MASS-IDENTIFIED PARTICLE-PRODUCTION IN PROTON-ANTIPROTON COLLISIONS AT ROOT-S = 300, 540, 1000, AND 1800 GEV SO PHYSICAL REVIEW D LA English DT Article ID MULTIPLICITY DEPENDENCE; TRANSVERSE-MOMENTUM; MONTE-CARLO; SQUARE-ROOT-S=1.8 TEV; FINITE TEMPERATURE; PBARP INTERACTIONS; TEVATRON COLLIDER; PHASE-TRANSITION; KAON PRODUCTION; DRIFT CHAMBER AB The yields and average transverse momenta of pions, kaons, and antiprotons produced at the Fermilab ppBAR collider at square-root s = 300, 540, 1000, and 1800 GeV are presented and compared with data from the energies reached at the CERN collider. We also present data on the dependence of average transverse momentum [p(t)] and particle ratios as a function of charged particle density dN(c)/deta; data for particle densities as high as six times the average value, corresponding to a Bjorken energy density 6 GeV/fm3, are reported. These data are relevant to the search for quark-gluon phase of QCD. C1 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. DUKE UNIV,DEPT PHYS,DURHAM,NC 27706. UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. PURDUE UNIV,DEPT PHYS & CHEM,W LAFAYETTE,IN 47907. RP ALEXOPOULOS, T (reprint author), DEPAUW UNIV,DEPT PHYS,GREENCASTLE,IN 46135, USA. NR 38 TC 83 Z9 83 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG 1 PY 1993 VL 48 IS 3 BP 984 EP 997 DI 10.1103/PhysRevD.48.984 PG 14 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LP611 UT WOS:A1993LP61100004 ER PT J AU ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BADEN, AR BACCHETTA, N BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, J MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PIACENTINO, G PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEAFF, M SHOCKET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPIES, A SPHICAS, P STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP YI, C YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S AF ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BADEN, AR BACCHETTA, N BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, J MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PIACENTINO, G PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEAFF, M SHOCKET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPIES, A SPHICAS, P STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP YI, C YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S TI MEASUREMENT OF THE DIJET MASS-DISTRIBUTION IN P(P)OVER-BAR COLLISIONS AT ROOT-S = 1.8 TEV SO PHYSICAL REVIEW D LA English DT Article ID INCLUSIVE CROSS-SECTION; PBARP COLLISIONS; QCD; CALORIMETER; SCATTERING; COLLIDER; GLUONS AB The dijet invariant mass distribution has been measured in the region between 120 and 1000 GeV/c2, in 1.8-TeV ppBAR collisions. The data sample was collected with the Collider Detector at Fermilab (CDF). Data are compared to leading order (LO) and next-to-leading order (NLO) QCD calculations using two different clustering cone radii R in the jet definition. A quantitative test shows good agreement of data with the LO and NLO QCD predictions for a cone of R = 1. The test using a cone of R = 0. 7 shows less agreement. The NLO calculation shows an improvement compared to LO in reproducing the shape of the spectrum for both radii, and approximately predicts the cone size dependence of the cross section. 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. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. UNIV PADUA,INST NAZL FIS NUCL,I-35131 PADUA,ITALY. HARVARD UNIV,CAMBRIDGE,MA 02138. UNIV ILLINOIS,URBANA,IL 61801. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. IST NAZL FIS NUCL,LAB NAZL FRASCATI,FRASCATI,ITALY. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 30032,JAPAN. UNIV MICHIGAN,ANN ARBOR,MI 48109. 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. TEXAS A&M UNIV SYST,COLL STN,TX 77843. UNIV ROCHESTER,ROCHESTER,NY. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. TUFTS UNIV,MEDFORD,MA 02155. ROCKEFELLER UNIV,NEW YORK,NY 10021. RUTGERS UNIV,NEW BRUNSWICK,NJ 08903. UNIV WISCONSIN,MADISON,WI 53706. RP ABE, F (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Kim, Soo-Bong/B-7061-2014; St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012 OI Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Chiarelli, Giorgio/0000-0001-9851-4816 NR 25 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 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG 1 PY 1993 VL 48 IS 3 BP 998 EP 1008 DI 10.1103/PhysRevD.48.998 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LP611 UT WOS:A1993LP61100005 ER PT J AU BRANCO, GC MOROZUMI, T PARADA, PA REBELO, MN AF BRANCO, GC MOROZUMI, T PARADA, PA REBELO, MN TI CP ASYMMETRIES IN B0 DECAYS IN THE PRESENCE OF FLAVOR-CHANGING NEUTRAL CURRENTS SO PHYSICAL REVIEW D LA English DT Article ID KOBAYASHI-MASKAWA MATRIX; QUARK MIXING MATRIX; UNITARY MATRIX; PARAMETRIZATION; MODULI; NONCONSERVATION; RECONSTRUCTION; VIOLATION; ELEMENTS; PHASES AB We study in detail models with vectorlike quarks, with special emphasis on their implications for CP asymmetries in B0 decays. In this class of models there are deviations from unitarity in the Cabibbo-Kobayashi-Maskawa matrix and flavor-changing neutral currents which, although naturally suppressed, may have important consequences. We show that even a relatively small contribution of Z-mediated flavor-changing neutral currents to B0-B0BAR mixing can lead to significant departures from the predictions of the standard model for CP asymmetries in B0 decays. C1 INST SUPER TECN,P-1699 LISBON,PORTUGAL. ROCKEFELLER UNIV,NEW YORK,NY 10021. STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP BRANCO, GC (reprint author), INST NACL INVEST CIENTIF,CFMC,AVE PROF GAMA PINTO 2,P-1699 LISBON,PORTUGAL. OI Branco, Gustavo C./0000-0001-5974-7043; Rebelo, Margarida Nesbitt/0000-0002-8744-5146 NR 30 TC 82 Z9 82 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG 1 PY 1993 VL 48 IS 3 BP 1167 EP 1175 DI 10.1103/PhysRevD.48.1167 PG 9 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LP611 UT WOS:A1993LP61100019 ER PT J AU LUTY, MA AF LUTY, MA TI GAUGE-THEORY WITH NAMBU-JONA-LASINIO DYNAMICS SO PHYSICAL REVIEW D LA English DT Article ID ELECTROWEAK SYMMETRY-BREAKING; COMPOSITE HIGGS BOSONS; TOP QUARK CONDENSATE; STANDARD MODEL; T-QUARK; MASS AB We construct a model of gauge fields and fermions which we argue can be fine-tuned to give rise to dynamics similar to that of the Nambu-Jona-Lasinio model. The only major dynamical assumption made is that the symmetry-breaking transition is second order. The application of this model to electroweak symmetry breaking is briefly discussed. RP LUTY, MA (reprint author), LAWRENCE BERKELEY LAB,THEORET PHYS GRP,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 31 TC 9 Z9 9 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG 1 PY 1993 VL 48 IS 3 BP 1295 EP 1300 DI 10.1103/PhysRevD.48.1295 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LP611 UT WOS:A1993LP61100033 ER PT J AU MAHLON, G YAN, TM DUNN, C AF MAHLON, G YAN, TM DUNN, C TI GENERALIZED GLUON CURRENTS AND APPLICATIONS IN QCD SO PHYSICAL REVIEW D LA English DT Article ID GAUGE-THEORIES; MULTIPLE BREMSSTRAHLUNG; HIGH-ENERGIES; HELICITY AMPLITUDES; PARTON PROCESSES; SCATTERING; SUBPROCESS; QUARK AB We present a recursion relation for a current containing n off-shell plus an arbitrary number of on-shell gluons. We are able to obtain an exact solution for n=2 when all of the on-shell gluons have the same helicity, and one of the off-shell gluons is given a ''generalized'' polarization vector. We then apply this solution to derive an expression for the amplitude for qqBAR --> qqggBAR ... g. C1 CORNELL UNIV,NEWMAN LAB NUCL STUDIES,ITHACA,NY 14853. JET PROP LAB,PASADENA,CA 91109. RP MAHLON, G (reprint author), FERMILAB NATL ACCELERATOR LAB,DEPT THEORET PHYS,MS 106,POB 500,BATAVIA,IL 60510, USA. NR 40 TC 10 Z9 10 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG 1 PY 1993 VL 48 IS 3 BP 1337 EP 1374 DI 10.1103/PhysRevD.48.1337 PG 38 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LP611 UT WOS:A1993LP61100039 ER PT J AU HEISELBERG, H AF HEISELBERG, H TI SCREENING IN QUARK DROPLETS SO PHYSICAL REVIEW D LA English DT Article ID QUANTUM CHROMODYNAMICS; SUPERDENSE MATTER; STRANGE MATTER; EARLY UNIVERSE; NEUTRON-STARS; EVAPORATION; TENSION; STATE; BAG AB Finite systems of quark matter are found to have charge densities varying spatially on length scales of the order of the Debye screening length which is estimated to be approximately 5 fm/c. Describing the quark matter by a simple bag model the charge densities and electrostatic potentials are calculated in the Thomas-Fermi approximation. The resulting relation between the total charge Z and the mass number A differs from previous work. Whereas small droplets of quark matter are almost uniformly charged, large droplets of quark matter act like a conductor and are only charged within a screening length from the surface. Including surface energies in addition to Coulomb energies, the binding energies of quark matter droplets are calculated and fission is found to be unlikely. C1 LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP HEISELBERG, H (reprint author), NIELS BOHR INST,BLEGDAMSVEJ 17,DK-2100 COPENHAGEN 0,DENMARK. OI Heiselberg, Henning/0000-0003-2229-2000 NR 30 TC 41 Z9 43 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG 1 PY 1993 VL 48 IS 3 BP 1418 EP 1423 DI 10.1103/PhysRevD.48.1418 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LP611 UT WOS:A1993LP61100043 ER PT J AU SKORDOS, PA AF SKORDOS, PA TI COMPRESSIBLE DYNAMICS, TIME REVERSIBILITY, MAXWELL DEMON, AND THE 2ND LAW SO PHYSICAL REVIEW E LA English DT Article AB A tantalizing version of Maxwell's demon is presented which appears to operate reversibly. A container of hard-core disks is separated into two chambers of equal volume by a membrane that selects which disk can penetrate depending on the disk's angle of incidence. The analysis of this system confirms that the second law of thermodynamics requires the incompressibility of microscopic dynamics or an appropriate energy cost for compressible microscopic dynamics. C1 MIT,CAMBRIDGE,MA 02139. RP SKORDOS, PA (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,B258,LOS ALAMOS,NM 87545, USA. NR 9 TC 9 Z9 9 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD AUG PY 1993 VL 48 IS 2 BP 777 EP 784 DI 10.1103/PhysRevE.48.777 PG 8 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LV383 UT WOS:A1993LV38300026 ER PT J AU MASLOV, S OLAMI, Z AF MASLOV, S OLAMI, Z TI CORRELATIONS, MEAN-FIELD PROPERTIES, AND SCALING OF A ONE-DIMENSIONAL SANDPILE MODEL SO PHYSICAL REVIEW E LA English DT Article ID SELF-ORGANIZED CRITICALITY; SINGULAR DIFFUSION AB We present a general relationship between different scaling exponents for the one-dimensional sand-pile problem to describe the self-adjusting of the slope of the sandpile. We solve the mean-field theory for this model, assuming that there is no correlation between the sizes of neighbor clusters. The mean-field theory does not give the correct exponents, since the clusters are strongly correlated. We characterize these correlations, identify the functional form of the cluster distribution function, and show how the multifractal scaling for averaged quantities arises from this form. RP MASLOV, S (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Maslov, Sergei/C-2397-2009 OI Maslov, Sergei/0000-0002-3701-492X NR 6 TC 0 Z9 0 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 AUG PY 1993 VL 48 IS 2 BP 863 EP 866 DI 10.1103/PhysRevE.48.863 PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LV383 UT WOS:A1993LV38300036 ER PT J AU MAINIERI, R AF MAINIERI, R TI DIFFICULTIES IN USING AVERAGED ORBITS TO EXTRACT SCALING FUNCTIONS SO PHYSICAL REVIEW E LA English DT Article ID RAYLEIGH-BENARD CONVECTION AB Trajectory scaling functions are the basic element in the study of chaotic dynamical systems from which any long-time average can be computed. They have never been extracted from an experimental time series, the reason being their sensitivity to noise. It is shown, by numerical simulations, that the scaling function is more sensitive to drift in the control parameters than to noise in the time series. It is also explained how naive averaging of the orbit points may lead to erroneous results. RP MAINIERI, R (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,MAIL STOP B258,LOS ALAMOS,NM 87545, USA. NR 17 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD AUG PY 1993 VL 48 IS 2 BP 900 EP 903 PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LV383 UT WOS:A1993LV38300038 ER PT J AU SANCHEZ, A GUINEA, F SANDER, LM HAKIM, V LOUIS, E AF SANCHEZ, A GUINEA, F SANDER, LM HAKIM, V LOUIS, E TI GROWTH AND FORMS OF LAPLACIAN AGGREGATES SO PHYSICAL REVIEW E LA English DT Article ID DIFFUSION-LIMITED AGGREGATION; ELECTRODEPOSITION CLUSTERS; FRACTAL DIMENSIONALITY; DIELECTRIC-BREAKDOWN; SELF-SIMILARITY; RANDOM-WALK; MODEL AB The shapes and general morphological properties of aggregates grown following the eta rule (v(surface) is-proportional-to \E\eta) [L. Niemeyer, L. Pietronero, and H. J. Wiessmann, Phys. Rev. Lett. 52, 1033 (1984)] have been investigated. v(surface) is the velocity at the interface and E the electric field. The fractal dimension decreases monotonically from its diffusion-limited aggregation value (eta = 1) to a number indistinguishable from 1 at eta greater than or similar to 4. Simultaneously, the multifractal properties become independent of eta. An alternative method to generate large clusters, and gain insight into the growth process, is also presented. Various analytical approximations are discussed. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV MICHIGAN,HARRISON M RANDALL LAB PHYS,ANN ARBOR,MI 48109. ECOLE NORMALE SUPER,PHYS STAT LAB,F-75231 PARIS 05,FRANCE. UNIV ALICANTE,DEPT FIS APLICADA,E-09080 ALICANTE,SPAIN. RP SANCHEZ, A (reprint author), UNIV CARLOS 3,ESCUELA POLITECN SUPER,AVENIDA MEDITERRANEO 20,E-28913 LEGANES,SPAIN. RI Sanchez, Angel/A-9229-2008; Guinea, Francisco/A-7122-2008; OI Sanchez, Angel/0000-0003-1874-2881; Guinea, Francisco/0000-0001-5915-5427; hakim, vincent/0000-0001-7505-8192 NR 29 TC 17 Z9 17 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD AUG PY 1993 VL 48 IS 2 BP 1296 EP 1304 DI 10.1103/PhysRevE.48.1296 PG 9 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LV383 UT WOS:A1993LV38300081 ER PT J AU MOSHAMMER, H AF MOSHAMMER, H TI APPLICATION OF THE FOKKER-PLANCK EQUATION TO PARTICLE-BEAM INJECTION INTO E- STORAGE-RINGS SO PHYSICAL REVIEW E LA English DT Article AB Nonlinear forces in the longitudinal accelerating field-or in the transverse magnetic fields-lead to filamentation of the injected emittance and to the decoherence of the center-of-mass motion. The dynamics of the particle distribution function in the presence of synchrotron radiation is governed by the Fokker-Planck equation. We derive the time evolution of the distribution function after injection as an approximate solution to the Fokker-Planck equation. The approximation assumes the injected emittance to be considerably larger than the equilibrium emittance, which is fulfilled for a certain class of storage rings, e.g., damping rings. In the limit of no quantum excitation, this distribution function will then be an exact solution. Higher moments of the distribution can be expressed in combinations of elementary functions and agree very well with multiparticle simulations. RP MOSHAMMER, H (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 21 TC 3 Z9 3 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD AUG PY 1993 VL 48 IS 2 BP 1390 EP 1400 DI 10.1103/PhysRevE.48.1390 PG 11 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LV383 UT WOS:A1993LV38300092 ER PT J AU CAI, D BISHOP, AR SANCHEZ, A AF CAI, D BISHOP, AR SANCHEZ, A TI LENGTH-SCALE COMPETITION IN THE DAMPED SINE-GORDON CHAIN WITH SPATIOTEMPORAL PERIODIC DRIVING SO PHYSICAL REVIEW E LA English DT Article ID NEAR-INTEGRABLE PDE; EQUATION; DRIVEN; SYSTEM; CHAOS; POTENTIALS; COMPLEXITY; STABILITY; DYNAMICS; ROUTE AB It is shown that there are two different regimes for the damped sine-Gordon chain driven by the spatiotemporal periodic force GAMMA sin(omegat - k(n)x) with a flat initial condition. For omega > k(n), the system first bifurcates at a critical GAMMA(c)(n) to a translating two-breather excitation from a state locked to the driver. For omega < k(n), the excitations of the system are the locked states with the phase velocity omega/k(n) in all the regions of GAMMA studied. In the first regime, the frequency of the breathers is controlled by omega, and the velocity of the breathers, controlled by k(n), is shown to be the group velocity determined from the linear dispersion relation for the sine-Gordon equation. A linear stability analysis reveals that, in addition to two competing length scales, namely, the width of the breathers and the spatial period of the driving, there is one more length scale which plays an important role in controlling the dynamics of the system at small driving. In the second regime the length scale k(n) controls the excitation. The above picture is further corroborated by numerical nonlinear spectral analysis. An energy-balance estimate is also presented and shown to predict the critical value of GAMMA in good agreement with the numerical simulations. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV CARLOS III MADRID,ESCUELA POLITECN SUPER,E-28913 MADRID,SPAIN. RP CAI, D (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. RI Sanchez, Angel/A-9229-2008 OI Sanchez, Angel/0000-0003-1874-2881 NR 22 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 AUG PY 1993 VL 48 IS 2 BP 1447 EP 1452 DI 10.1103/PhysRevE.48.1447 PG 6 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LV383 UT WOS:A1993LV38300100 ER PT J AU HEADGORDON, T STILLINGER, FH AF HEADGORDON, T STILLINGER, FH TI OPTIMAL NEURAL NETWORKS FOR PROTEIN-STRUCTURE PREDICTION SO PHYSICAL REVIEW E LA English DT Article ID SECONDARY STRUCTURE PREDICTION; GLOBULAR PROTEINS; ACID-SEQUENCES; OPTIMIZATION; RECOGNITION; MOTIFS; NET AB The successful application of neural-network algorithms for prediction of protein structure is stymied by three problem areas: the sparsity of the database of known protein structures, poorly devised network architectures which make the input-output mapping opaque, and a global optimization problem in the multiple-minima space of the network variables. We present a simplified polypeptide model residing in two dimensions with only two amino-acid types, A and B, which allows the determination of the global energy structure for all possible sequences of pentamer, hexamer, and heptamer lengths. This model simplicity allows us to compile a complete structural database and to devise neural networks that reproduce the tertiary structure of all sequences with absolute accuracy and with the smallest number of network variables. These optimal networks reveal that the three problem areas are convoluted, but that thoughtful network designs can actually deconvolute these detrimental traits to provide network algorithms that genuinely impact on the ability of the network to generalize or learn the desired mappings. Furthermore, the two-dimensional polypeptide model shows sufficient chemical complexity so that transfer of neural-network technology to more realistic three-dimensional proteins is evident. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. RP HEADGORDON, T (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Head-Gordon, Teresa/E-5818-2011 NR 32 TC 14 Z9 15 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD AUG PY 1993 VL 48 IS 2 BP 1502 EP 1515 DI 10.1103/PhysRevE.48.1502 PG 14 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LV383 UT WOS:A1993LV38300108 ER PT J AU ROSENAU, P AF ROSENAU, P TI RANDOM WALKER AND THE TELEGRAPHERS EQUATION - A PARADIGM OF A GENERALIZED HYDRODYNAMICS SO PHYSICAL REVIEW E LA English DT Note AB The telegrapher's equation (TE) is the continuum limit of a persisting random walker. We find that the TE reproduces the original spectrum almost exactly for all wavelengths-far beyond the validity of the expansion. This surprising property is used as a paradigm towards the derivation of a generalized hydrodynamics. Applications to other problems are explored. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,MS-B258,LOS ALAMOS,NM 87545. RP ROSENAU, P (reprint author), TECHNION ISRAEL INST TECHNOL,DEPT MECH ENGN,IL-32000 HAIFA,ISRAEL. NR 10 TC 21 Z9 21 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD AUG PY 1993 VL 48 IS 2 BP R655 EP R657 DI 10.1103/PhysRevE.48.R655 PG 3 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LV383 UT WOS:A1993LV38300005 ER PT J AU PEDERSON, LR MCGRAIL, BP MCVAY, GL PETERSENVILLALOBOS, DA SETTLES, NS AF PEDERSON, LR MCGRAIL, BP MCVAY, GL PETERSENVILLALOBOS, DA SETTLES, NS TI KINETICS OF ALKALI SILICATE AND ALUMINOSILICATE GLASS REACTIONS IN ALKALI CHLORIDE SOLUTIONS - INFLUENCE OF SURFACE-CHARGE SO PHYSICS AND CHEMISTRY OF GLASSES LA English DT Article ID AQUEOUS-SOLUTIONS; WASTE GLASS; SEA-WATER; DISSOLUTION; ELECTROLYTE; PH; THERMODYNAMICS; SODIUM AB Initial rates of alkali ion exchange from sodium trisilicate, potassium trisilicate, lithium disilicate, and several sodium aluminosilicate glasses were measured as a function of electrolyte concentration and pH (concentration scale) using pH-stat methods. For the alkali silicate glasses, rates of ion exchange were depressed in solutions of their respective alkali chlorides except near the isoelectric point (pH 2.3), where ion exchange rates in deionised water and in electrolytes were indistinguishable. Similar but smaller rate depressions were obtained for sodium aluminosilicate glasses in sodium chloride solutions. Trends in these initial rates were consistent with predictions of a model relating glass reaction kinetics to the surface concentration of hydrogen ions, which is a function of the electric surface potential at the glass/solution interface. Although not directly measurable, electric surface potentials were calculated as a function of electrolyte concentration and pH using site-dissociation theory. RP PEDERSON, LR (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 44 TC 10 Z9 10 U1 0 U2 4 PU SOC GLASS TECHNOLOGY PI SHEFFIELD PA THORNTON 20 HALLAM GATE ROAD, SHEFFIELD, S YORKSHIRE, ENGLAND S10 5BT SN 0031-9090 J9 PHYS CHEM GLASSES JI Phys. Chem. Glasses PD AUG PY 1993 VL 34 IS 4 BP 140 EP 148 PG 9 WC Chemistry, Physical; Materials Science, Ceramics SC Chemistry; Materials Science GA LQ980 UT WOS:A1993LQ98000002 ER PT J AU SCHUBERT, G GLATZMAIER, GA TRAVIS, B AF SCHUBERT, G GLATZMAIER, GA TRAVIS, B TI STEADY, 3-DIMENSIONAL, INTERNALLY HEATED CONVECTION SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Article ID NUMBER THERMAL-CONVECTION; SPHERICAL-SHELLS; MANTLE CONVECTION; VISCOSITY; PATTERNS AB Numerical calculations have been carried out of steady, symmetric, three-dimensional modes of convection in internally heated, infinite Prandtl number, Boussinesq fluids at a Rayleigh number of 1.4 X 10(4) in a spherical shell with inner/outer radius of 0.55 and in a 3 X 3 x 1 rectangular box. Multiple patterns of convection occur in both geometries. In the Cartesian geometry the patterns are dominated by cylindrical cold downflows and a broad hot upwelling. In the spherical geometry the patterns consist of cylindrical cold downwellings centered either at the vertices of a tetrahedron or the centers of the faces of a cube. The cold downflow cylinders are immersed in a background of upwelling within which there are cylindrical hot concentrations (plumes) and hot halos around the downflows. The forced hot upflow return plumes of internally heated spherical convection are fundamentally different from the buoyancy-driven plumes of heated from below convection. C1 UNIV CALIF LOS ANGELES,INST GEOPHYS & PLANETARY PHYS,LOS ANGELES,CA 90024. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SCHUBERT, G (reprint author), UNIV CALIF LOS ANGELES,DEPT EARTH & SPACE SCI,LOS ANGELES,CA 90024, USA. NR 22 TC 13 Z9 13 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8213 J9 PHYS FLUIDS A-FLUID PD AUG PY 1993 VL 5 IS 8 BP 1928 EP 1932 DI 10.1063/1.858818 PG 5 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA LN702 UT WOS:A1993LN70200009 ER PT J AU GANG, FY LEBOEUF, JN AF GANG, FY LEBOEUF, JN TI MODE-COUPLING EFFECTS ON ALPHA-PARTICLE-DRIVEN LONG-WAVELENGTH ALFVEN-WAVE INSTABILITY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Letter ID TOKAMAK; DESTABILIZATION; EIGENMODES AB It is demonstrated both analytically and numerically that mode couplings play an important role in the nonlinear evolution of alpha-particle-driven long wavelength Alfven wave instabilities. The mode coupling process is characterized by a beat between two linearly unstable Alfven waves having opposite frequencies, which generates a linearly stable, static (zero frequency) mode. The backreaction of the static mode tends to stabilize the Alfven instabilities by eliminating the phase shift between the alpha pressure and the Alfven fluctuations. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. RP GANG, FY (reprint author), MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139, USA. NR 9 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD AUG PY 1993 VL 5 IS 8 BP 2736 EP 2738 DI 10.1063/1.860713 PG 3 WC Physics, Fluids & Plasmas SC Physics GA LR032 UT WOS:A1993LR03200002 ER PT J AU LEBOEUF, JN CHARLTON, LA CARRERAS, BA AF LEBOEUF, JN CHARLTON, LA CARRERAS, BA TI SHEAR-FLOW EFFECTS ON THE NONLINEAR EVOLUTION OF THERMAL INSTABILITIES SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID TOKAMAK EDGE TURBULENCE AB In the weak radiation drive regime, the coupling between the thermal instability driven by impurity radiation and the self-consistent flow profile modification leads to a simple dynamical system that can be approximated by the Volterra-Lotka equations. In this system the shear flow acts as a predator and the temperature fluctuations act as prey. The solutions are oscillatory, and their behavior resembles that of edge-localized modes (ELM's). The solutions of the simplified model are compared with the three-dimensional and two-dimensional nonlinear numerical results for this instability. RP LEBOEUF, JN (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 13 TC 17 Z9 17 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD AUG PY 1993 VL 5 IS 8 BP 2959 EP 2966 DI 10.1063/1.860682 PG 8 WC Physics, Fluids & Plasmas SC Physics GA LR032 UT WOS:A1993LR03200025 ER PT J AU COHEN, BI WILLIAMS, TJ DIMITS, AM BYERS, JA AF COHEN, BI WILLIAMS, TJ DIMITS, AM BYERS, JA TI GYROKINETIC SIMULATIONS OF EXB VELOCITY-SHEAR EFFECTS ON ION-TEMPERATURE-GRADIENT MODES SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID L-H TRANSITION; EDGE ELECTRIC-FIELD; POLOIDAL ROTATION; PARTICLE SIMULATION; JFT-2M TOKAMAK; TURBULENCE; TRANSPORT; FLOWS; INSTABILITIES; PROFILES AB Data from several current tokamak experiments indicate that the equilibrium perpendicular velocity field can become strongly sheared accompanying the transition from the L mode to the H mode, i.e. improved, confinement, and that fluctuation levels are reduced. Linear theory suggests that velocity shear can stabilize ion-temperature-gradient (ITG) modes when the frequency shift experienced by the mode due to the radial dependence of the Doppler shift is comparable to the growth rate. To confirm the predictions of linear theory and to explore nonlinear issues, e.g., self-generated shear flows, saturation amplitudes, and the concomitant energy transport levels, two- and three-dimensional gyrokinetic simulations of ITG modes have been performed. The simulations were done with and without magnetic shear in a slab configuration using the partially linearized (deltaf) algorithm to reduce statistical noise. The simulations confirm theoretical analyses of the stabilizing and destabilizing effects of imposed perpendicular velocity fields. The ion energy transport levels at saturation follow the trends of the linear growth rates and the mixing-length estimates. The gyrokinetic simulations are in qualitative agreement with the results of gyrofluid simulations, and exhibit saturation amplitudes and energy transport similar to those in gyrofluid simulations. These transport levels are generally lower than those typically reported in the laboratory experiments; including toroidal driving terms significantly increases the transport levels in the simulations. RP COHEN, BI (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 40 TC 40 Z9 40 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD AUG PY 1993 VL 5 IS 8 BP 2967 EP 2980 DI 10.1063/1.860683 PG 14 WC Physics, Fluids & Plasmas SC Physics GA LR032 UT WOS:A1993LR03200026 ER PT J AU SHAING, KC HSU, CT AF SHAING, KC HSU, CT TI CONVECTIVE MOMENTUM TRANSPORT, SHOCK VISCOSITY, AND THE L-H TRANSITION IN TOKAMAKS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID EDGE ELECTRIC-FIELD; POLOIDAL ROTATION; TOROIDAL PLASMAS; JFT-2M TOKAMAK; MODE PLASMAS; BIFURCATION; DIFFUSION; PROFILES AB Convective momentum transport associated with V.delV in the momentum equation is calculated for arbitrary values of the poloidal EXB Mach number M(p). Here, V is the plasma flow velocity. The physics origin of the convective momentum transport is associated with the coupling of the poloidal variation of the viscosity-driven flux to that of the flow velocity in the magnetic surface. When the radial gradient scale length of the plasma velocity is of the order of the ion poloidal gyroradius, rho(pi), the convective momentum transport becomes comparable to the ion viscosity. At M(p) congruent-to 1, the ion viscosity associated with shock-the shock viscosity-approximately balances the convective momentum transport to maintain the lowest-order ambipolarity. The implications of the effects of shock and convective momentum transport for the previous L-H transition bifurcation theory [K. C. Shaing and E. C. Crume, Jr., Phys. Rev. Lett. 63, 2369 (1989)] are discussed, and an extended bifurcation theory including these effects is presented. It is shown that the experimentally relevant plasma viscosity, effective plasma viscosity, is very similar to that obtained without including compressibility effects, even if shock exists. C1 MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139. RP SHAING, KC (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 29 TC 7 Z9 7 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD AUG PY 1993 VL 5 IS 8 BP 2981 EP 2988 DI 10.1063/1.860684 PG 8 WC Physics, Fluids & Plasmas SC Physics GA LR032 UT WOS:A1993LR03200027 ER PT J AU CHARLTON, LA LEBOEUF, JN AF CHARLTON, LA LEBOEUF, JN TI EFFECTS OF DIAMAGNETIC DRIFT AND COMPRESSIBILITY ON LINEAR RESISTIVE MAGNETOHYDRODYNAMIC STABILITY OF STELLARATORS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID GEOMETRY; PLASMA AB To study diamagnetic and compressibility effects for stellarators, toroidally averaged equations describing resistive pressure-driven modes are developed. Linear stability results are given for cylindrical geometry and toroidal geometry. When toroidal coupling is included, both the analytical theory and numerical calculations show that diamagnetic effects can be destabilizing when they are small. However, for parameters appropriate to the Advanced Toroidal Facility (ATF) experimental device [J. F. Lyon et al., Fusion Technol. 10, 179 (1986)] the diamagnetic effects are large and stabilizing. The linear results also show that for the specific cases reported here compressibility effects tend to cancel toroidal effects. Cylindrical calculations which include diamagnetic effects may then be adequate for the study of the experimental data. RP CHARLTON, LA (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD AUG PY 1993 VL 5 IS 8 BP 2989 EP 2998 DI 10.1063/1.860685 PG 10 WC Physics, Fluids & Plasmas SC Physics GA LR032 UT WOS:A1993LR03200028 ER PT J AU MAZZUCATO, E AF MAZZUCATO, E TI RELATIVISTIC EFFECTS ON MICROWAVE REFLECTOMETRY - REPLY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Note RP MAZZUCATO, E (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD AUG PY 1993 VL 5 IS 8 BP 3111 EP 3111 DI 10.1063/1.860646 PG 1 WC Physics, Fluids & Plasmas SC Physics GA LR032 UT WOS:A1993LR03200043 ER PT J AU CHANOWITZ, M AF CHANOWITZ, M TI JUDGE SSC (AND OTHER BASIC SCIENCE) ON ITS POTENTIAL FOR REWARD, NOT ITS SIZE SO PHYSICS TODAY LA English DT Letter RP CHANOWITZ, M (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, 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 AUG PY 1993 VL 46 IS 8 BP 13 EP 13 DI 10.1063/1.2808996 PN 1 PG 1 WC Physics, Multidisciplinary SC Physics GA LU123 UT WOS:A1993LU12300002 ER PT J AU PETERSON, CW AF PETERSON, CW TI THE FLUID PHYSICS OF PARACHUTE INFLATION SO PHYSICS TODAY LA English DT Article AB Cloth pocked to the density of oak emerges from its container in a second, changes its shape from cylindrical log to 'cloth streamers' to hemispherical cup in another 2 seconds, and decelerates a one-ton payload from the speed of sound to highway speed limits. RP PETERSON, CW (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 4 TC 1 Z9 1 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD AUG PY 1993 VL 46 IS 8 BP 32 EP 39 DI 10.1063/1.881361 PN 1 PG 8 WC Physics, Multidisciplinary SC Physics GA LU123 UT WOS:A1993LU12300011 ER PT J AU VENNERI, F BOWMAN, C JAMESON, R AF VENNERI, F BOWMAN, C JAMESON, R TI ACCELERATORS ADDRESS NUCLEAR WASTE PROBLEMS SO PHYSICS WORLD LA English DT Article RP VENNERI, F (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. NR 0 TC 3 Z9 3 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8585 J9 PHYS WORLD JI Phys. World PD AUG PY 1993 VL 6 IS 8 BP 40 EP 45 PG 6 WC Physics, Multidisciplinary SC Physics GA LQ976 UT WOS:A1993LQ97600021 ER PT J AU PATTERSON, GW HUGLY, S HARRISON, D AF PATTERSON, GW HUGLY, S HARRISON, D TI STEROLS AND PHYTYL ESTERS OF ARABIDOPSIS-THALIANA UNDER NORMAL AND CHILLING TEMPERATURES SO PHYTOCHEMISTRY LA English DT Article DE ARABIDOPSIS-THALIANA; CRUCIFERAE; STEROLS; SITOSTEROL; CHOLESTEROL; STIGMASTEROL; CAMPESTEROL; PHYTYL ESTERS ID GAS-CHROMATOGRAPHY; RETENTION AB Sitosterol was the principal sterol in Arabidopsis thaliana with campesterol being second most abundant. Small amounts of cholesterol, stigmasterol, campestanol, brassicasterol, stigmastanol, fucosterol and isofucosterol were identified by GC-MS. Free sterol made up 88% of the total sterol, but both esters and glycosides were detected. No significant changes in sterol composition were noted in Arabidopsis thaliana or in mutant PM-11 in response to chilling temperatures. Phytyl esters accumulated in mutant PM-11 after two or more days of chilling temperature, but did not accumulate in the wild type under chilling conditions. The fatty acids in these phytyl esters are atypical of the total fatty acids of Arabidopsis and are dominated by short chain, saturated fatty acids and hexadecatrienoic acid (16:3). The accumulation of these phytyl esters would be consistent with chlorophyll degradation, inhibition of late stages in fatty acid biosynthesis and degradation of the chloroplast. C1 USDA,INSECT & NEUROBIOL HORMONE LAB,BELTSVILLE,MD 20705. UNIV MARYLAND,DEPT BOT,COLL PK,MD 20742. RP PATTERSON, GW (reprint author), MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824, USA. NR 10 TC 29 Z9 30 U1 2 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0031-9422 J9 PHYTOCHEMISTRY JI Phytochemistry PD AUG PY 1993 VL 33 IS 6 BP 1381 EP 1383 DI 10.1016/0031-9422(93)85095-9 PG 3 WC Biochemistry & Molecular Biology; Plant Sciences SC Biochemistry & Molecular Biology; Plant Sciences GA LU776 UT WOS:A1993LU77600020 ER PT J AU RAIKHEL, NV LAST, RL AF RAIKHEL, NV LAST, RL TI THE WIDE WORLD OF PLANT MOLECULAR-GENETICS SO PLANT CELL LA English DT Editorial Material ID MAIZE C1 CORNELL UNIV,BOYCE THOMPSON INST PLANT RES,PLANT MOLEC BIOL PROGRAM,ITHACA,NY 14853. RP RAIKHEL, NV (reprint author), MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824, USA. RI Last, Robert/D-9197-2011 NR 24 TC 4 Z9 4 U1 0 U2 0 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 1040-4651 J9 PLANT CELL JI Plant Cell PD AUG PY 1993 VL 5 IS 8 BP 823 EP 830 PG 8 WC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology SC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology GA LV732 UT WOS:A1993LV73200002 ER PT J AU LEITH, CE AF LEITH, CE TI NUMERICAL-MODELS OF WEATHER AND CLIMATE SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 1993 INTERNATIONAL CONF ON SHERWOOD FUSION THEORY CY MAR 29-31, 1993 CL NEWPORT, RI ID GENERAL-CIRCULATION; ATMOSPHERIC MODELS AB Numerical weather prediction has provided routine forecasts of global weather for more than thirty years. During that period numerical models have evolved from the use of low resolution balance equations to high resolution fluid dynamics equations with added terms to describe physical processes such as radiative heating and latent heat release. Both grid-point and spectral transform methods have been used. Forecasts require an initial state, and much effort has gone into data assimilation and initialization consistent with the nonlinear dynamics of the models. As is well known, the chaotic atmosphere is of limited predictability, and deterministic forecasts axe only good for about a week. The climate is defined by the statistical properties of the weather, and these change far more slowly. There is much current interest in the response of climate to human influences. Global climate change studies are largely based on weather models of lower resolution that are run for much longer times and averaged. But the search continues for a true climate model that deals directly with slowly evolving statistics. RP LEITH, CE (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 15 TC 1 Z9 1 U1 0 U2 3 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 AUG PY 1993 VL 35 IS 8 BP 919 EP 927 DI 10.1088/0741-3335/35/8/002 PG 9 WC Physics, Fluids & Plasmas SC Physics GA LR743 UT WOS:A1993LR74300003 ER PT J AU BARNES, DC NEBEL, RA TURNER, L TIOURIRINE, TN AF BARNES, DC NEBEL, RA TURNER, L TIOURIRINE, TN TI ALTERNATE FUSION - CONTINUOUS INERTIAL CONFINEMENT SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 1993 INTERNATIONAL CONF ON SHERWOOD FUSION THEORY CY MAR 29-31, 1993 CL NEWPORT, RI ID PLASMA AB We argue that alternate fusion approaches should be pursued if: 1) They do not require magnetic confinement superior to tokamaks; 2) Their physics basis may be succinctly stated and experimentally tested; 3) They offer near-term applications to important technical problems; and 4) Their cost to proof-of-principle is low enough to be consistent with budget realities. An approach satisfying all of these criteria is presented, based on continuous inertial confinement. In such an approach, the inertia of a nonequilibrium plasma produces concentrations of plasma density. Recent theoretical developments[1] indicate that fusion gain of order unity or greater may be produced in a system as small as a few mm radius! Confinement is that of a nonneutralized plasma. A pure electron plasma with a radial beam velocity distribution is absolutely confined by an applied Penning trap field. Spherical convergence of the confined electrons forms a deep virtual cathode near r = 0, in which thermonuclear ions axe absolutely confined at useful densities. We examine the equilibrium, stability, and classical relaxation of such systems. A sketch of immediate and long-term experimental opportunities is given. RP BARNES, DC (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 19 TC 16 Z9 16 U1 0 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 AUG PY 1993 VL 35 IS 8 BP 929 EP 940 DI 10.1088/0741-3335/35/8/003 PG 12 WC Physics, Fluids & Plasmas SC Physics GA LR743 UT WOS:A1993LR74300004 ER PT J AU HAMMETT, GW BEER, MA DORLAND, W COWLEY, SC SMITH, SA AF HAMMETT, GW BEER, MA DORLAND, W COWLEY, SC SMITH, SA TI DEVELOPMENTS IN THE GYROFLUID APPROACH TO TOKAMAK TURBULENCE SIMULATIONS SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 1993 INTERNATIONAL CONF ON SHERWOOD FUSION THEORY CY MAR 29-31, 1993 CL NEWPORT, RI ID GRADIENT-DRIVEN TURBULENCE; POLOIDAL FLOW GENERATION; LANDAU-FLUID MODELS; GYROKINETIC EQUATIONS; TEMPERATURE; INSTABILITY; PLASMA AB A status report is given on recent developments in the gyrofluid approach to simulating tokamak turbulence. ''Gyrofluid'' (or ''gyro-Landau fluid'') equations attempt to extend the range of validity of fluid equations to a more collisionless regime typical of tokamaks, by developing fluid models of important kinetic effects such as Landau-damping and gyro-orbit averaging. The fluid moments approach should converge if enough moments are kept, though this may require a large number of moments for some processes. Toroidal gyrofluid equations have been extended from 4 to 6 moments, and to include the mudelB magnetic mirroring force. An efficient field-line coordinate system for toroidal turbulence simulations (useful for both particle and fluid simulations) is presented. Nonlinear 3-D simulations of toroidal ITG-driven turbulence indicate that turbulence-generated sheared flows play an important role in the development and saturation of the turbulence. There is a strong enhancement of the flows when the electrons are assumed adiabatic on each flux surface, which is partially offset by toroidal drift effects which reduce the flows. C1 UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. RP HAMMETT, GW (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Hammett, Gregory/D-1365-2011; Dorland, William/B-4403-2009 OI Hammett, Gregory/0000-0003-1495-6647; Dorland, William/0000-0003-2915-724X NR 26 TC 168 Z9 168 U1 0 U2 5 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 AUG PY 1993 VL 35 IS 8 BP 973 EP 985 DI 10.1088/0741-3335/35/8/006 PG 13 WC Physics, Fluids & Plasmas SC Physics GA LR743 UT WOS:A1993LR74300007 ER PT J AU JONES, S VONGOELER, S BERNABEI, S IGNAT, D KESNER, J KAITA, R LUCKHARDT, S PAOLETTI, F RIMINI, F AF JONES, S VONGOELER, S BERNABEI, S IGNAT, D KESNER, J KAITA, R LUCKHARDT, S PAOLETTI, F RIMINI, F TI CALCULATION OF AN UPPER LIMIT FOR AN EFFECTIVE FAST-ELECTRON DIFFUSION CONSTANT USING THE HARD X-RAY-CAMERA ON PBX-M SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 1993 INTERNATIONAL CONF ON SHERWOOD FUSION THEORY CY MAR 29-31, 1993 CL NEWPORT, RI ID CURRENT DRIVE; RUNAWAY; TOKAMAK AB Fast electron localization and transport are important for tokamak current profile control schemes. The hard x-ray camera on PBX-M produces two-dimensional, time resolved tangential images of fast electron bremsstrahlung, from which a fast electron diffusion constant is calculated. Assuming a radially narrow lower hybrid power absorption profile, a momentum space absorption profile and a transport model [1], a model fast electron current density profile is calculated and compared to an experimentally derived profile, and the diffusion coefficient is adjusted until a good fit is found. Using this model, we compute an upper limit for an effective diffusion constant of D* less-than-or-equal-to 1.1 m2/sec to within a factor of two. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. JET JOINT UNDERTAKING,ABINGDON OX14 3EA,OXON,ENGLAND. RP JONES, S (reprint author), MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139, USA. NR 22 TC 10 Z9 10 U1 0 U2 1 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 AUG PY 1993 VL 35 IS 8 BP 1003 EP 1017 DI 10.1088/0741-3335/35/8/008 PG 15 WC Physics, Fluids & Plasmas SC Physics GA LR743 UT WOS:A1993LR74300009 ER PT J AU SHAN, XW MONTGOMERY, D AF SHAN, XW MONTGOMERY, D TI GLOBAL SEARCHES OF HARTMANN-NUMBER-DEPENDENT STABILITY BOUNDARIES SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 1993 INTERNATIONAL CONF ON SHERWOOD FUSION THEORY CY MAR 29-31, 1993 CL NEWPORT, RI ID TEARING MODES; TOKAMAKS; STATES AB A numerical technique is developed for searching for the stability boundary for a resistive, straight-cylinder, magnetohydrodynamic equilibrium with spatially-dependent resistivity. For fixed aspect ratio, the boundary is a curve in the plane whose axes are Hartmann number and pinch ratio (or reciprocal of the safety factor at the wall). The technique is spectral and utilizes orthonormal eigenfunctions of the curl. Nonlinear behavior above the stability boundary is computed for a particular profile, using a nonlinear version of the code. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP SHAN, XW (reprint author), DARTMOUTH COLL,DEPT PHYS & ASTRON,HANOVER,NH 03755, USA. RI Shan, Xiaowen/H-2836-2013 OI Shan, Xiaowen/0000-0002-6350-9248 NR 21 TC 21 Z9 21 U1 2 U2 2 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 AUG PY 1993 VL 35 IS 8 BP 1019 EP 1032 DI 10.1088/0741-3335/35/8/009 PG 14 WC Physics, Fluids & Plasmas SC Physics GA LR743 UT WOS:A1993LR74300010 ER PT J AU SYKES, A CONNOR, JW DUCK, R GIBSON, K GOODALL, DHJ GRYAZNEVICH, M HENDER, TC HUGILL, J ROBINSON, DC TURNER, MF VALVOIC, M WALSH, M WILSON, HR COLCHIN, RJ PENG, YKM AF SYKES, A CONNOR, JW DUCK, R GIBSON, K GOODALL, DHJ GRYAZNEVICH, M HENDER, TC HUGILL, J ROBINSON, DC TURNER, MF VALVOIC, M WALSH, M WILSON, HR COLCHIN, RJ PENG, YKM TI TIGHT ASPECT RATIO TOKAMAKS - THEORY AND EXPERIMENT SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 1993 INTERNATIONAL CONF ON SHERWOOD FUSION THEORY CY MAR 29-31, 1993 CL NEWPORT, RI AB The START (Small Tight Aspect Ratio Tokamak) experiment became operational in January 1991 at AEA Fusion Culham Laboratory. It is the only tokamak producing hot plasmas at aspect ratios as low as A = R/a approximately 1.3, and is providing valuable insight into the physical processes (such as toroidicity and trapping) involved at low aspect ratio. Three topics are discussed in this paper: equilibrium properties, including evidence of neo-classical and bootstrap effects; energy confinement studies; and MHD properties, including possible explanations for the apparent absence of the major disruption at low A. C1 UNIV MANCHESTER,INST SCI & TECHNOL,DEPT PURE & APPL PHYS,MANCHESTER M60 1QD,LANCS,ENGLAND. OAK RIDGE NATL LAB,OAK RIDGE,TN. RP SYKES, A (reprint author), UKAEA,EURATOM,FUS ASSOC,CULHAM LAB,ABINGDON OX14 3DB,OXON,ENGLAND. NR 11 TC 24 Z9 24 U1 0 U2 2 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 AUG PY 1993 VL 35 IS 8 BP 1051 EP 1062 DI 10.1088/0741-3335/35/8/011 PG 12 WC Physics, Fluids & Plasmas SC Physics GA LR743 UT WOS:A1993LR74300012 ER PT J AU XU, XQ COHEN, RH AF XU, XQ COHEN, RH TI EFFECTS OF NEUTRAL GAS COLLISIONS ON THE CONDUCTING-WALL INSTABILITY SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 1993 INTERNATIONAL CONF ON SHERWOOD FUSION THEORY CY MAR 29-31, 1993 CL NEWPORT, RI ID TOKAMAKS; TURBULENCE AB The shallow angle of an oblique incidence of the magnetic field to the divertor plates (e. g. 1-degrees-3-degrees in in DIII-D) leads to a spatial extension of the sheath of the order of gyroradius (e. g. 0.3 mm) normal to the plate. Since the actual particle path along the field lines inside the sheath is around 1 cm, ionization processes within the sheath become important and reduce the sheath potential. We show that ionization due to electron-neutral collisions can reduce the end-loss current of the divertor plasma, contributing to a stabilizing effect on the conducting wall-mode. Thus the neutral gas collisions can be used as a knob to control the conducting-wall-driven turbulence in the scrape-off layer (SOL) experimentally. RP XU, XQ (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 24 TC 12 Z9 12 U1 0 U2 0 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 AUG PY 1993 VL 35 IS 8 BP 1071 EP 1084 DI 10.1088/0741-3335/35/8/013 PG 14 WC Physics, Fluids & Plasmas SC Physics GA LR743 UT WOS:A1993LR74300014 ER PT J AU MARTIN, HL AF MARTIN, HL TI UPDATE ON WATER-POLLUTION CONTROL LEGISLATION SO PLATING AND SURFACE FINISHING LA English DT Article RP MARTIN, HL (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER SITE,AIKEN,SC 29802, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER ELECTROPLATERS SOC INC PI ORLANDO PA 12644 RESEARCH PKWY, ORLANDO, FL 32826-3298 SN 0360-3164 J9 PLAT SURF FINISH JI Plat. Surf. Finish. PD AUG PY 1993 VL 80 IS 8 BP 16 EP 17 PG 2 WC Metallurgy & Metallurgical Engineering; Materials Science, Coatings & Films SC Metallurgy & Metallurgical Engineering; Materials Science GA LQ446 UT WOS:A1993LQ44600003 ER PT J AU LUNDIN, SJ AF LUNDIN, SJ TI VERIFICATION OF DUAL-USE CHEMICAL WEAPONS UNDER THE CWC - THE CASE OF THIODIGLYCOL - LUNDIN,SJ SO POLITICS AND THE LIFE SCIENCES LA English DT Book Review RP LUNDIN, SJ (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808 L205,LIVERMORE,CA 94551, USA. NR 5 TC 0 Z9 0 U1 0 U2 1 PU BEECH TREE PUBLISHING PI GUILDFORD PA 10 WATFORD CLOSE, GUILDFORD, SURREY, ENGLAND GU1 2EP SN 0730-9384 J9 POLIT LIFE SCI JI Polit. Life Sci. PD AUG PY 1993 VL 12 IS 2 BP 289 EP 291 PG 3 WC Biology; History & Philosophy Of Science; Social Issues SC Life Sciences & Biomedicine - Other Topics; History & Philosophy of Science; Social Issues GA LV379 UT WOS:A1993LV37900031 ER PT J AU KORBER, BTM FARBER, RM WOLPERT, DH LAPEDES, AS AF KORBER, BTM FARBER, RM WOLPERT, DH LAPEDES, AS TI COVARIATION OF MUTATIONS IN THE V3 LOOP OF HUMAN-IMMUNODEFICIENCY-VIRUS TYPE-1 ENVELOPE PROTEIN - AN INFORMATION-THEORETIC ANALYSIS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE CONVERGENT EVOLUTION; PEPTIDE VACCINE DESIGN ID PRINCIPAL NEUTRALIZING DETERMINANT; STRUCTURAL ELEMENTS; SYNTHETIC PEPTIDES; CONSERVED SEQUENCE; T-CELL; ANTIBODIES; GP120; PREDICTION; TROPISM; DOMAIN AB The V3 loop of the human immunodeficiency virus type 1 (HIV-1) envelope protein is a highly variable region that is both functionally and immunologically important. Using available amino acid sequences from the V3 region, we have used an information theoretic quantity called mutual information, a measure of covariation, to quantify dependence between mutations in the loop. Certain pairs of sites, including non-contiguous sites along the sequence, do not have independent mutations but display considerable, statistically significant, covarying mutations as measured by mutual information. For the pairs of sites with the highest mutual information, specific amino acids were identified that were highly predictive of amino acids in the linked site. The observed interdependence between variable sites may have implications for structural or functional relationships; separate experimental evidence indicates functional linkage between some of the pairs of sites with high mutual information. Further specific mutational studies of the V3 loop's role in determining viral phenotype are suggested by our analyses. Also, the implications of our results may be important to consider for V3 peptide vaccine design. The methods used here are generally applicable to the study of variable proteins. C1 LOS ALAMOS NATL LAB,DIV THEORET,COMPLEX SYST GRP T13,LOS ALAMOS,NM 87545. RP KORBER, BTM (reprint author), SANTA FE INST,1660 OLD PECOS TRAIL,SANTA FE,NM 87501, USA. OI Korber, Bette/0000-0002-2026-5757 FU NLM NIH HHS [F37 LM00011] NR 27 TC 157 Z9 162 U1 0 U2 10 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD AUG 1 PY 1993 VL 90 IS 15 BP 7176 EP 7180 DI 10.1073/pnas.90.15.7176 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LQ335 UT WOS:A1993LQ33500059 PM 8346232 ER PT J AU CAMPION, SR BIAMONTI, C MONTELIONE, GT NIYOGI, SK AF CAMPION, SR BIAMONTI, C MONTELIONE, GT NIYOGI, SK TI THE ROLE OF ASPARAGINE-32 IN FORMING THE RECEPTOR-BINDING EPITOPE OF HUMAN EPIDERMAL GROWTH-FACTOR SO PROTEIN ENGINEERING LA English DT Article DE ASN32 OF HUMAN EGF; MUTAGENESIS; NMR ANALYSIS; RECEPTOR BINDING; 2ND-SITE MUTATION ID SITE-DIRECTED MUTAGENESIS; NUCLEAR-MAGNETIC-RESONANCE; PROTEIN; H-1-NMR; CHAIN; NMR; SPECTROSCOPY; ARGININE-41; LEUCINE-47; RESIDUES AB The highly conserved asparagine residue at position 32 (Asn32) in the 'hinge' region of epidermal growth factor (EGF) separates the N- and C-terminal structural motifs of the EGF molecule and is therefore an appropriate target for structure - function studies. Analogs of human EGF (hEGF) were generated in which Asn32 was substituted with aspartate, glycine, isoleucine, lysine, proline and tryptophan. The relative affinity of the EGF receptor for mutant hEGF analogs was determined by radioreceptor competition assay. A wide range of receptor affinities was observed depending on the amino acid substitution. N32K and N32W hEGF analogs had relatively high receptor affinity, while the N32G and N32D analogs showed decreased affinity, 35% and 25% respectively, relative to wild type hEGF. However, no binding of the N32P analog was detected by radioreceptor competition assay. The N32P mutant displayed an NMR spectrum significantly different from that of native wild type hEGF, indicating gross structural perturbation. In contrast, the N32K and N32D analogs exhibited spectra similar to that of native wild type hEGF. Genetically combining the N32D hEGF with an hEGF species having either the mutation L26G in the N-terminal region or L47A in the C-terminal region, generated double-mutant hEGF species which had relative affinities essentially equal to the product of the relative affinities of the parent hEGF mutants, indicating functionally independent changes in ligand - receptor interaction. These studies indicate the requirement for H-bond donor functionality in the side chain of residue number 32 in forming a fully competent receptor-binding epitope. C1 UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. UNIV MED & DENT NEW JERSEY,GRAD PROGRAM BIOCHEM & MOLEC BIOL,PISCATAWAY,NJ 08854. UNIV TENNESSEE,PROT ENGN & MOLEC MUTAGENESIS PROGRAM,OAK RIDGE,TN 37831. RUTGERS UNIV,CTR ADV BIOTECHNOL & MED,DEPT MOLEC BIOL & BIOCHEM,PISCATAWAY,NJ 08854. FU NCI NIH HHS [CA 505735]; NIGMS NIH HHS [GM-47014] NR 27 TC 20 Z9 20 U1 0 U2 1 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0269-2139 J9 PROTEIN ENG JI Protein Eng. PD AUG PY 1993 VL 6 IS 6 BP 651 EP 659 DI 10.1093/protein/6.6.651 PG 9 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA LT973 UT WOS:A1993LT97300012 PM 8234236 ER PT J AU GHIORSO, A SEABORG, GT ORGANESSIAN, YT ZVARA, I ARMBRUSTER, P HESSBERGER, FP HOFMANN, S LEINO, M MUNZENBERG, G REISDORF, W SCHMIDT, KH WILKINSON, DH WAPSTRA, AH ULEHLA, I BARBER, RC GREENWOOD, NN HRYNKIEWICZ, A JEANNIN, YP LEFORT, M SAKAI, M AF GHIORSO, A SEABORG, GT ORGANESSIAN, YT ZVARA, I ARMBRUSTER, P HESSBERGER, FP HOFMANN, S LEINO, M MUNZENBERG, G REISDORF, W SCHMIDT, KH WILKINSON, DH WAPSTRA, AH ULEHLA, I BARBER, RC GREENWOOD, NN HRYNKIEWICZ, A JEANNIN, YP LEFORT, M SAKAI, M TI DISCOVERY OF THE TRANSFERMIUM ELEMENTS - RESPONSES SO PURE AND APPLIED CHEMISTRY LA English DT Article C1 DUBNA JOINT INST NUCL RES,FLEROV LAB NUCL REACT,DUBNA,RUSSIA. GESELL SCHWERIONENFORSCH MBH,HEAVY ELEMENT RES GRP,W-6100 DARMSTADT 11,GERMANY. BANK COURT CHAMBERS,OXFORD OX4 3YF,ENGLAND. RP GHIORSO, A (reprint author), LAWRENCE BERKELEY LAB,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 0 TC 0 Z9 0 U1 1 U2 5 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0033-4545 J9 PURE APPL CHEM JI Pure Appl. Chem. PD AUG PY 1993 VL 65 IS 8 BP 1815 EP 1824 DI 10.1351/pac199365081815 PG 10 WC Chemistry, Multidisciplinary SC Chemistry GA LR733 UT WOS:A1993LR73300029 ER PT J AU OKINAKA, RT ANZICK, SL OLLER, A THILLY, WG AF OKINAKA, RT ANZICK, SL OLLER, A THILLY, WG TI ANALYSIS OF LARGE X-RAY-INDUCED MUTANT POPULATIONS BY DENATURING GRADIENT GEL-ELECTROPHORESIS SO RADIATION RESEARCH LA English DT Article ID HAMSTER APRT LOCUS; IONIZING-RADIATION; HUMAN-CELLS; DNA-POLYMERASES; POINT MUTATIONS; HUMAN-LYMPHOBLASTS; MAMMALIAN-CELLS; GAMMA-RAYS; SEQUENCE; MUTAGENESIS C1 MIT,WHITAKER COLL HLTH SCI & TECHNOL,CTR ENVIRONM HLTH SCI,CAMBRIDGE,MA 02139. RP OKINAKA, RT (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545, USA. NR 43 TC 12 Z9 12 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 AUG PY 1993 VL 135 IS 2 BP 212 EP 221 DI 10.2307/3578297 PG 10 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA LW262 UT WOS:A1993LW26200010 PM 8367592 ER PT J AU BRUCE, JE ANDERSON, GA HOFSTADLER, SA WINGER, BE SMITH, RD AF BRUCE, JE ANDERSON, GA HOFSTADLER, SA WINGER, BE SMITH, RD TI TIME-BASE MODULATION FOR THE CORRECTION OF CYCLOTRON FREQUENCY-SHIFTS OBSERVED IN LONG-LIVED TRANSIENTS FROM FOURIER-TRANSFORM ION-CYCLOTRON-RESONANCE MASS-SPECTROMETRY OF ELECTROSPRAYED BIOPOLYMERS SO RAPID COMMUNICATIONS IN MASS SPECTROMETRY LA English DT Article ID MAGNETIC-FIELD; IONIZATION; DESORPTION; PROTEINS; SPECTRA; ENTROPY AB The occurrence of small shifts in the cyclotron frequency during the acquisition of very long transients (in excess of 80 s) has been observed to be a limiting factor for ultrahigh-resolution mass measurements of protein ions performed with electrospray-ionization Fourier-transform ion-cyclotron-resonance mass spectrometry. Resolution measurements were restricted to values less than 10(6) because of the frequency shifts. Measurements of the frequency shifts, performed by sequentially transforming small segments of the transient, allowed the shift to be characterized and fitted to a 4th-order equation. The sampling rate of the acquired transient was then modulated (at a rate equal to the reciprocal of the rate for the frequency shift) to allow ultrahigh resolution, greater than 2 X 10(6), and improved mass measurement and precision to be achieved for a small protein. C1 PACIFIC NW LAB, DEPT CHEM SCI, CHEM METHODS & SEPARAT GRP, RICHLAND, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 24 TC 44 Z9 44 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0951-4198 J9 RAPID COMMUN MASS SP JI Rapid Commun. Mass Spectrom. PD AUG PY 1993 VL 7 IS 8 BP 700 EP 703 DI 10.1002/rcm.1290070803 PG 4 WC Chemistry, Analytical; Spectroscopy SC Chemistry; Spectroscopy GA LT073 UT WOS:A1993LT07300002 ER PT J AU GAO, W AF GAO, W TI A SIMPLE BIDIRECTIONAL-REFLECTANCE MODEL APPLIED TO A TALLGRASS CANOPY SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID VEGETATION INDEXES; HEMISPHERICAL REFLECTANCE; RADIATIVE-TRANSFER; SINGLE SCATTERING; SURFACE; PHOTOSYNTHESIS; TRANSPIRATION; PRAIRIE; ALBEDO AB A simple bidirectional reflectance model suitable for homogeneous plant canopies is developed. The model was applied to simulate directional changes of spectral reflectances from a tallgrass canopy and compared with field measurements by Deering and Middleton (1990). A modified two-stream approach was used in the model by considering the transfers of upward reflected and diffuse radiation in different viewing directions, downward direct and diffuse radiation, and their dependences upon canopy leaf orientation. An analytical solution was derived to allow a fast computation of directional reflectances based on canopy parameters or a retrieval of canopy parameters based on reflectance measurements. Modeled spectral reflectances are generally in a good agreement with measurements, and effects of inhomogeneous canopy characteristics such as ''hot spot'' and of soil reflection were examined. Both modeled and observed reflectances show strong backscattering and relatively weak forward scattering in the red band, but a more symmetric distribution in the near-infrared band. The directional changes of reflectance in both red and near-infrared bands are dominated by primary scattering the magnitudes of reflectance in the near-infrared band are largely influenced by secondary scattering. Model simulations for three theoretical leaf angle distributions (planophile, spherical, and erectophile) show that hemispherical reflectance or albedo could be overestimated by nadir reflectance at a small solar zenith angle and underestimated at a large solar zenith angle. The error, however, can be reduced to a minimum at an optimal solar zenith angle which has the same magnitude for the three leaf angle distributions but decreases with increasing canopy leaf area index. Modeled vegetation spectral index, NDVI, appears to vary by 10-24% with viewing angle for a given leaf angle distribution and canopy leaf area index, and it generally has a larger value for forward scattering than for backscattering. RP GAO, W (reprint author), ARGONNE NATL LAB,DIV ENVIRONM RES,BLDG 203,RM J152,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 37 TC 19 Z9 20 U1 1 U2 1 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0034-4257 J9 REMOTE SENS ENVIRON JI Remote Sens. Environ. PD AUG PY 1993 VL 45 IS 2 BP 209 EP 224 DI 10.1016/0034-4257(93)90043-W PG 16 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA LM850 UT WOS:A1993LM85000008 ER PT J AU WANG, ZL AF WANG, ZL TI ELECTRON REFLECTION, DIFFRACTION AND IMAGING OF BULK CRYSTAL-SURFACES IN TEM AND STEM SO REPORTS ON PROGRESS IN PHYSICS LA English DT Review ID ENERGY-LOSS SPECTROSCOPY; MOLECULAR-BEAM EPITAXY; PLASMON INELASTIC-SCATTERING; SCANNING TUNNELING MICROSCOPE; THERMAL DIFFUSE-SCATTERING; CLEAN SI(111) SURFACE; 111 SILICON SURFACES; X 7 SURFACE; RHEED PATTERNS; ATOMIC STEPS AB Reflection electron microscopy (REM) is a new technique for real space imaging of bulk crystal surfaces. The REM is performed in a transmission electron microscope (TEM) or a scanning TEM (STEM) using high-energy electrons at a grazing incidence angle. In this article, a comprehensive review has been given on basic techniques, fundamental physics, studies of surface reconstructions, and special applications of REM. Theoretical calculations have been described to illustrate the resonance scattering processes of electrons at the bulk crystal surfaces in the geometry of reflection high-energy electron diffraction (RHEED). Fundamental contrast mechanisms of REM have been illustrated to show the surface sensitivity of REM. Applications of REM for in-situ imaging of surface dynamic processes have been summarized for studies of metals, semiconductors, metal-on-semiconductors, semiconductor-on-semiconductors, and ceramics. Inelastic excitations of crystal surfaces in RHEED have been examined to demonstrate a technique, reflection electron energy-loss spectroscopy (REELS), for studying surface electronic structures and determining surface chemical compositions. Finally, novel techniques used in conjunction with REM, such a secondary electron imaging, scanning tunnelling microscopy (STM) and electron holography, have been described to show the future development of REM. C1 UNIV TENNESSEE,DEPT MAT SCI,KNOXVILLE,TN 37996. RP WANG, ZL (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,BLDG 5500,MS 6376,POB 2008,OAK RIDGE,TN 37831, USA. RI Wang, Zhong Lin/E-2176-2011 OI Wang, Zhong Lin/0000-0002-5530-0380 NR 239 TC 19 Z9 19 U1 1 U2 20 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0034-4885 J9 REP PROG PHYS JI Rep. Prog. Phys. PD AUG PY 1993 VL 56 IS 8 BP 997 EP 1065 DI 10.1088/0034-4885/56/8/002 PG 69 WC Physics, Multidisciplinary SC Physics GA LX685 UT WOS:A1993LX68500002 ER PT J AU CHU, WT LUDEWIGT, BA RENNER, TR AF CHU, WT LUDEWIGT, BA RENNER, TR TI INSTRUMENTATION FOR TREATMENT OF CANCER USING PROTON AND LIGHT-ION BEAMS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Review ID CHARGED-PARTICLE RADIOTHERAPY; RELATIVE BIOLOGICAL EFFECTIVENESS; CALIFORNIA-ONCOLOGY-GROUP; DOSE-VOLUME HISTOGRAMS; 670A MEV NE-20; RADIATION-THERAPY; HEAVY-IONS; UVEAL MELANOMA; PION THERAPY; BIOMEDICAL EXPERIMENTS AB Clinical trials using accelerated heavy charged-particle beams for treating cancer and other diseases have been performed for nearly four decades. Recently there have been worldwide efforts to construct hospital-based medically dedicated proton or light-ion accelerator facilities. To make such accelerated heavy charged-particle beams clinically useful, specialized instruments must be developed to modify the physical characteristics of the particle beams in order to optimize their biological and clinical effects. This article reviews the beam modifying devices and associated dosimetric equipment developed specifically for controlling and monitoring the clinical beams. RP CHU, WT (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 534 TC 197 Z9 210 U1 6 U2 22 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD AUG PY 1993 VL 64 IS 8 BP 2055 EP 2122 DI 10.1063/1.1143946 PG 68 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA LR979 UT WOS:A1993LR97900001 ER PT J AU BENO, MA KNAPP, GS AF BENO, MA KNAPP, GS TI A NEW POWDER DIFFRACTION METHOD FOR LINEAR DETECTORS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB In this article we describe a new type of powder diffractometer that gives a significant improvement in count rate over existing methods. The key to the new technique is the use of a flat, diffracted beam monochromator in combination with a position sensitive detector. The incident x rays fall on a flat plate or capillary sample and multiple diffraction lines are reflected by the monochromator out of the equatorial plane onto a position sensitive detector. Since the monochromator is tuned for the incident beam energy, background from fluorescence or other scattering is eliminated and data can be recorded over a range of several degrees thereby providing a large improvement in counting efficiency over conventional diffractometers. This new method is also compared to a previous article which employed a focusing analyzer crystal and position sensitive detector. RP BENO, MA (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 6 TC 9 Z9 9 U1 0 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 AUG PY 1993 VL 64 IS 8 BP 2201 EP 2206 DI 10.1063/1.1143960 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA LR979 UT WOS:A1993LR97900015 ER PT J AU ROSS, SB DAVIS, JR DUTRA, J AF ROSS, SB DAVIS, JR DUTRA, J TI AN EXTREMELY LOW-NOISE, LOW-COST, CONSTANT-CURRENT SUPPLY SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB We have constructed an extremely low noise constant current power supply. The design was optimized for low noise at 0.5 Hz. For a 134 mA supply, noise at this frequency is 2.5 nA rms/square-root Hz At 1 Hz, it is 1.0 nA rms/square-root Hz. The supply is roughly an order of magnitude quieter than the quietest commercial unit we know of. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. LINEAR TECHNOL CORP,MILPITAS,CA 95035. RP ROSS, SB (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 2 TC 4 Z9 4 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD AUG PY 1993 VL 64 IS 8 BP 2379 EP 2381 DI 10.1063/1.1143939 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA LR979 UT WOS:A1993LR97900048 ER PT J AU SLONE, TH AF SLONE, TH TI BODY-SURFACE AREA MISCONCEPTIONS SO RISK ANALYSIS LA English DT Letter ID INTERSPECIES EXTRAPOLATION; TOXICITY DATA; FORMULA RP SLONE, TH (reprint author), LAWRENCE BERKELEY LAB,BARKER HALL,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 23 TC 9 Z9 9 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 AUG PY 1993 VL 13 IS 4 BP 375 EP 377 DI 10.1111/j.1539-6924.1993.tb00736.x PG 3 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA LX892 UT WOS:A1993LX89200001 PM 8234944 ER PT J AU GOLD, LS AF GOLD, LS TI THE IMPORTANCE OF DATA ON MECHANISM OF CARCINOGENESIS IN EFFORTS TO PREDICT LOW-DOSE HUMAN RISK SO RISK ANALYSIS LA English DT Editorial Material RP GOLD, LS (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 9 TC 7 Z9 7 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 AUG PY 1993 VL 13 IS 4 BP 399 EP 401 DI 10.1111/j.1539-6924.1993.tb00739.x PG 3 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA LX892 UT WOS:A1993LX89200004 PM 8234947 ER PT J AU TAYLOR, AC EVANS, JS MCKONE, TE AF TAYLOR, AC EVANS, JS MCKONE, TE TI THE VALUE OF ANIMAL TEST INFORMATION IN ENVIRONMENTAL-CONTROL DECISIONS SO RISK ANALYSIS LA English DT Article DE VALUE OF INFORMATION; CARCINOGENIC POTENCY ESTIMATION; ENVIRONMENTAL CONTROL; DECISION ANALYSIS ID CARCINOGENIC POTENCY; CHEMICAL CARCINOGENICITY; RATS; MICE; PREDICTION; RISKS AB Value of information (VOI) analytic techniques are used to evaluate the benefit of performing animal bioassays to provide information about the cancer potency of specific chemical compounds. These tools allow the identification of the conditions in which the cost of reducing uncertainty about potency, by performing a subchronic or chronic bioassay, is justified by the benefit of having improved information for making control decisions. The decision analytic results are readily scaled to apply to a range of human contact rates (exposures) and a variety of control strategies. The sensitivity of results to uncertainty about animal to human extrapolation and the design of the bioassay is explored. An evaluation of the possible gains in general understanding about the mechanisms of carcinogenicity resulting from chronic bioassays is beyond the scope of this approach. C1 HARVARD UNIV,SCH PUBL HLTH,INTERDISCIPLINARY PROGRAMS HLTH,BOSTON,MA 02115. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP TAYLOR, AC (reprint author), HARVARD UNIV,SCH PUBL HLTH,DEPT ENVIRONM HLTH,ENVIRONM SCI & ENGN PROGRAM,ROOM I-1308,BOSTON,MA 02115, USA. NR 39 TC 29 Z9 29 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 AUG PY 1993 VL 13 IS 4 BP 403 EP 412 DI 10.1111/j.1539-6924.1993.tb00740.x PG 10 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA LX892 UT WOS:A1993LX89200005 PM 8234948 ER PT J AU FORD, VA WILKINSON, JE KENNEL, SJ AF FORD, VA WILKINSON, JE KENNEL, SJ TI THROMBOMODULIN DISTRIBUTION DURING MURINE DEVELOPMENT SO ROUXS ARCHIVES OF DEVELOPMENTAL BIOLOGY LA English DT Article DE THROMBOMODULIN EXPRESSION; MURINE DEVELOPMENT; ANGIOGENESIS; MONOCLONAL ANTIBODIES ID PROTEIN-C ACTIVATION; NATURAL ANTICOAGULANT; FETAL DEVELOPMENT; FACTOR-V; THROMBIN; LUNG; DOMAIN; IDENTIFICATION; FETOMODULIN; ENDOTHELIUM AB Thrombomodulin is a transmembrane glycoprotein involved in the regulation of clot formation. Previous work has shown that in the adult mouse, thrombomodulin expression is primarily located on the luminal surface of endothelial cells; whereas during development, thrombomodulin has been localized to the placental parietal endoderm, the neuroepithelium, head mesenchyme, lung bud, and atrium of Day 10.5 post coitum embryos. We examined the expression of thrombomodulin in the adult mouse and throughout murine development from Day 7.5 to Day. 18.5 post coitum. The high expression of thrombomodulin in the lung bud, developing gonads, leptomeninges, and the parietal endoderm in comparison to the expression levels in the adult organs suggest that thrombomodulin may play an important role in development. C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37830. UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE,TN 37830. UNIV TENNESSEE,SCH VET,KNOXVILLE,TN 37996. NR 34 TC 18 Z9 18 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0930-035X J9 ROUX ARCH DEV BIOL JI Rouxs Arch. Dev. Biol. PD AUG PY 1993 VL 202 IS 6 BP 364 EP 370 DI 10.1007/BF00188735 PG 7 WC Cell Biology; Developmental Biology SC Cell Biology; Developmental Biology GA LR263 UT WOS:A1993LR26300007 PM 28306049 ER PT J AU HSIUNG, LM ZHANG, JZ MCINTYRE, DC GOLZ, JW HALPERN, BL SCHMITT, JJ WADLEY, HNG AF HSIUNG, LM ZHANG, JZ MCINTYRE, DC GOLZ, JW HALPERN, BL SCHMITT, JJ WADLEY, HNG TI STRUCTURE AND PROPERTIES OF JET VAPOR-DEPOSITED ALUMINUM-ALUMINUM OXIDE NANOSCALE LAMINATES SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article C1 JET PROC CORP,NEW HAVEN,CT 06511. SANDIA NATL LABS,DIV 1834,ALBUQUERQUE,NM 87185. RP HSIUNG, LM (reprint author), UNIV VIRGINIA,DEPT MAT SCI & ENGN,CHARLOTTESVILLE,VA 22903, USA. NR 15 TC 8 Z9 8 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD AUG 1 PY 1993 VL 29 IS 3 BP 293 EP 298 DI 10.1016/0956-716X(93)90502-J PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA LJ115 UT WOS:A1993LJ11500003 ER PT J AU DEWYNNE, JN FOWLER, AC HAGAN, PS AF DEWYNNE, JN FOWLER, AC HAGAN, PS TI MULTIPLE REACTION FRONTS IN THE OXIDATION-REDUCTION OF IRON-RICH URANIUM ORES SO SIAM JOURNAL ON APPLIED MATHEMATICS LA English DT Article DE REACTION-DIFFUSION; OXIDATION-REDUCTION; REACTION FRONTS ID GEOCHEMICAL SELF-ORGANIZATION; TRANSPORT AB This paper describes the oxidation of iron-rich uranium-bearing rocks by infiltration of ground-water. A reaction-diffusion model is set up to describe the sequence of reactions involving iron oxidation, uranium oxidation and reduction, sulphuric acid production, and dissolution of the host rock that occur. On a geological timescale of millions of years, the reactions occur very fast in very thin reaction fronts. It is shown that the redox front that separates oxidized (orange) rock from reduced (black) rock must actually consist of two separate fronts that move together, at which the two separate processes of uranium oxidation and iron reduction occur, respectively. Between these fronts, a high concentration of uranium is predicted. The mechanics of this process are not specific to uranium-mediated redox reactions, but apply generally and may be used to explain the formation of concentrated ore deposits in extended veins. On the long timescales of relevance, a quasi-static response results, and the problem can be solved explicitly in one dimension. This provides a framework for studying more realistic two-dimensional problems in fissured rocks and also for the future study of uraninite nodule formation. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV OXFORD,INST MATH,OXFORD OX1 3LB,ENGLAND. RP DEWYNNE, JN (reprint author), UNIV SOUTHAMPTON,FAC MATH STUDIES,SOUTHAMPTON SO9 5NH,HANTS,ENGLAND. RI Fowler, Andrew/I-5868-2014 NR 10 TC 12 Z9 12 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0036-1399 J9 SIAM J APPL MATH JI SIAM J. Appl. Math. PD AUG PY 1993 VL 53 IS 4 BP 971 EP 989 DI 10.1137/0153048 PG 19 WC Mathematics, Applied SC Mathematics GA LU491 UT WOS:A1993LU49100005 ER PT J AU CHEN, WYC AF CHEN, WYC TI INDUCED CYCLE STRUCTURES OF THE HYPEROCTAHEDRAL GROUP SO SIAM JOURNAL ON DISCRETE MATHEMATICS LA English DT Article DE HYPERCUBE; HYPEROCTAHEDRAL GROUP; INDUCED CYCLE STRUCTURE; POLYA THEORY AB In this paper, the n-dimensional hypercube Q(n) is treated as a graph whose vertex set consists of sequences of 0's and 1's of length n, and the hyperoctahedral group B(n) is the automorphism group of Q(n). It is well known that B(n) can be represented by the group of signed permutations, namely, any signed permutation induces a permutation on the vertices of Q(n), which preserves adjacency. Moreover, the set of signed permutations on n elements also induces a permutation group on the edges of Q(n), denoted H(n). The author studies the cycle structures of both B(n) and H(n). The method proposed here is to determine the induced cycle structure by computing the number of fixed vertices or fixed edges of a signed permutation in the cyclic group generated by a signed permutation of given type. Here we define the type of a signed permutation by a double partition based on its signed cycle decomposition. In this way, one can compute the cycle indices of both B(n), and H(n) by counting fixed vertices and fixed edges of a signed permutation. The formula for the cycle index of B, is much more natural and considerably simpler than that of Harrison and High [J. Combin. Theory, 4 (1968), pp. 277-299]. Meanwhile. the cycle structure of H(n) seems not to have been studied before, although it is well motivated by nonisomorphic edge colorings of Q(n), as well as by the recent interest in edge symmetries of computer networks. RP CHEN, WYC (reprint author), LOS ALAMOS NATL LAB,C-3,MAIL STOP B265,LOS ALAMOS,NM 87545, USA. NR 18 TC 11 Z9 11 U1 0 U2 1 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0895-4801 J9 SIAM J DISCRETE MATH JI SIAM Discret. Math. PD AUG PY 1993 VL 6 IS 3 BP 353 EP 362 DI 10.1137/0406028 PG 10 WC Mathematics, Applied SC Mathematics GA LQ019 UT WOS:A1993LQ01900002 ER PT J AU VISCO, SJ LIU, ML LIN, F KIMES, P DEJONGHE, LC AF VISCO, SJ LIU, ML LIN, F KIMES, P DEJONGHE, LC TI PROPERTIES AND MORPHOLOGY OF DOPED POLYCRYSTALLINE NA-BETA''-ALUMINA ELECTROLYTES SO SOLID STATE IONICS LA English DT Article ID SODIUM BETA-ALUMINA AB The effect of trace concentrations of metal oxides, Zn, Mg, Nb and Ge, on the intermediate temperature resistivity of Na-beta''-alumina electrolytes was investigated. The presence of the dopant oxides resulted in lowered resistivity values over the temperature range of 20 to 350-degrees-C. When the resistivities of the doped electrolytes were normalized to account for increased grain size relative to undoped samples, it appeared that the most effective additions for improving electrolyte conductivity were MgO and Nb2O5. The resistivity of the magnesia-doped samples at 170-degrees-C was as low as for that of the undoped electrolyte at 290-degrees-C, implying that magnesia doping of lithia-stabilized beta''-alumina electrolytes may improve the low temperature performance of beta''-alumina-based batteries. RP VISCO, SJ (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Liu, Meilin/E-5782-2010 OI Liu, Meilin/0000-0002-6188-2372 NR 7 TC 6 Z9 6 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2738 J9 SOLID STATE IONICS JI Solid State Ion. PD AUG PY 1993 VL 62 IS 3-4 BP 185 EP 191 DI 10.1016/0167-2738(93)90371-9 PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LX059 UT WOS:A1993LX05900005 ER PT J AU JOHNSON, SG FEAREY, BL AF JOHNSON, SG FEAREY, BL TI SPECTROSCOPIC STUDY OF THORIUM USING CONTINUOUS-WAVE RESONANCE IONIZATION MASS-SPECTROMETRY WITH ULTRAVIOLET IONIZATION SO SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY LA English DT Article ID ISOTOPES AB This paper presents recent results on an improved method of ionization for the cw-RIMS process for thorium (Th). This method involves the application of a high power ultraviolet (UV) argon ion laser for the second step in a two-step (1+1) (photon-to-resonance plus photon-to-ionization) ionization scheme. Over 90 thorium transitions are identified for use in a (1+1) continuous-wave resonance ionization mass spectrometry (cw-RIMS) ionization scheme. The excitation cross-section of several strong transitions was determined to be 10(-13)cm2. The optimum cw excitation scheme was with the resonant laser tuned to the 384.08 nm (26 036 cm-1) transition when using the multi-line UV argon ion laser for signal enhancement. For thorium, the increase in ionization efficiency was documented to be a minimum of one order-of-magnitude improvement over that achieved by conventional thermal ionization mass spectrometry (TIMS). The measured total ionization efficiency (detected ion signal/sample atoms loaded) was as high as 0.41%, which easily provided signal levels for efficiency measurements on sample sizes down to 25 ng, and should provide sufficient signal for isotopic analysis of volcanic-like samples as small as 1-5 ng of thorium. Based on geometric overlap considerations, the cw-RIMS ionization efficiency within the laser focal volume approaches approximately 100%. This cw-RIMS ionization efficiency promises to provide ample signal for the Th-230/Th-232 isotope ratio analysis of nanogram volcanic-like samples. The ability to determine accurately and precisely the Th-230/Th-232 isotopic ratios for nanogram samples represents an improvement over the TIMS technique, and is anticipated to have a significant effect on uranium-series disequilibrium measurements important in geochemistry and geochronology. C1 LOS ALAMOS NATL LAB, DIV ISOTOPE & NUCL CHEM, ISOTOPE SCI GRP, MS-J514, LOS ALAMOS, NM 87545 USA. ARGONNE W NATL LAB, ANALYT CHEM GRP, IDAHO FALLS, ID 83403 USA. NR 40 TC 10 Z9 10 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0584-8547 J9 SPECTROCHIM ACTA B JI Spectroc. Acta Pt. B-Atom. Spectr. PD AUG PY 1993 VL 48 IS 9 BP 1065 EP 1077 DI 10.1016/0584-8547(93)80097-E PG 13 WC Spectroscopy SC Spectroscopy GA LT593 UT WOS:A1993LT59300001 ER PT J AU DITLEVSEN, PD VANHOVE, MA SOMORJAI, GA AF DITLEVSEN, PD VANHOVE, MA SOMORJAI, GA TI MOLECULAR MODELING OF ETHYLENE DECOMPOSITION ON PLATINUM SURFACES SO SURFACE SCIENCE LA English DT Article ID SINGLE-CRYSTAL SURFACES; EXTENDED HUCKEL; PT(111); ADSORPTION; ACETYLENE; HYDROGENATION; DESORPTION; ETHYLIDYNE; MECHANISMS; DEUTERIUM AB We examine the process of dehydrogenating ethylene over the (111) and (100) platinum single crystal surfaces from a modeling point of view. In order to establish the reaction pathways and the important reaction coordinates, the stability and concentration of intermediate surface species must be known. We use a simple semi-empirical tight-binding scheme, based on the extended Huckel theory. In order to model the potential energy hyper-surface (PES) on which the energy minima are found, we use a pair-potential model to describe the repulsion, similar to the ASED-MO and other methods. We fit the parameters of the pair-potential to the vibrational properties of simple molecules and adsorbates. The energy is minimized with respect to all the coordinates of the hydrocarbons on the surface using the conjugate gradient method. On the Pt(111) surface ethylidyne (CCH3) is the most stable species. On the unreconstructed Pt(100) surface we find that the situation is different: ethylidyne is very unstable, in agreement with a recent HREELS study. This is because there are no threefold coordinated sites on the (100) surface and the repulsive part of the potential dominates in the fourfold adsorption site. The reaction barriers have been estimated by smoothly transforming the coordinates of the reactants into those of the products, while the energy of the transition state was simultaneously minimized with respect to the relevant coordinates. In this way we believe that the barriers have been determined with sufficient accuracy within the model. The general trend is that the barriers for hydrogenation-dehydrogenation from the adsorbate to the surface are considerably lower than the barriers for hydrogen transfer within the adsorbate (isomerization), which in turn is lower than that of a concerted reaction, like CHCH + 2H --> CH2CH2. From this we can determine the decomposition pathway for the ethylene to ethylidyne transition, in agreement with the findings of the ASED-MO method by Anderson. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP DITLEVSEN, PD (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 NR 36 TC 29 Z9 29 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 AUG 1 PY 1993 VL 292 IS 3 BP 267 EP 275 DI 10.1016/0039-6028(93)90332-E PG 9 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LP267 UT WOS:A1993LP26700008 ER PT J AU CHEN, SJ SANZ, F OGLETREE, DF HALLMARK, VM DEVINE, TM SALMERON, M AF CHEN, SJ SANZ, F OGLETREE, DF HALLMARK, VM DEVINE, TM SALMERON, M TI SELECTIVE DISSOLUTION OF COPPER FROM AU-RICH CU-AU ALLOYS - AN ELECTROCHEMICAL STM STUDY SO SURFACE SCIENCE LA English DT Article ID SCANNING TUNNELING MICROSCOPY; SILVER-GOLD ALLOYS; ANODIC-DISSOLUTION; CORROSION; SURFACES AB The selective dissolution of Cu from CuAu3 alloys has been studied by STM imaging in situ as a function of anodic polarization. The experiments were performed on (111) oriented films grown on mica that exhibit large terraces separated by steps. Dissolution of Cu in the subcritical region produces vacancies that aggregate to form two-dimensional voids in the terraces. The voids are one atom deep and grow in size as a function of dealloying time. Voids are not formed in the exposed second layer. The layer-by-layer removal of material becomes three-dimensional with profuse surface roughening above the critical potential. A model for the dealloying based on these results is proposed. C1 LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720. IBM CORP,ALMADEN RES CTR,SAN JOSE,CA 95120. UNIV BARCELONA,DEPT QUIM FIS,E-08028 BARCELONA,SPAIN. RP CHEN, SJ (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. RI Ogletree, D Frank/D-9833-2016 OI Ogletree, D Frank/0000-0002-8159-0182 NR 21 TC 29 Z9 29 U1 2 U2 17 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD AUG 1 PY 1993 VL 292 IS 3 BP 289 EP 297 DI 10.1016/0039-6028(93)90334-G PG 9 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LP267 UT WOS:A1993LP26700010 ER PT J AU MORRIS, MD MITCHELL, TJ YLVISAKER, D AF MORRIS, MD MITCHELL, TJ YLVISAKER, D TI BAYESIAN DESIGN AND ANALYSIS OF COMPUTER EXPERIMENTS - USE OF DERIVATIVES IN SURFACE PREDICTION SO TECHNOMETRICS LA English DT Article DE BAYESIAN PREDICTION; COMPUTER MODEL; INTERPOLATION; LATIN HYPERCUBE DESIGN; MAXIMIN DISTANCE DESIGN; SENSITIVITY ANALYSIS ID OPTIMIZATION; CODE AB This article is concerned with the problem of predicting a deterministic response function yo over a multidimensional domain T, given values of y0 and all of its first derivatives at a set of design sites (points) in T. The intended application is to computer experiments in which y0 is an output from a computer model of a physical system and each point in T represents a particular configuration of the input parameters. It is assumed that the first derivatives are already available (e.g., from a sensitivity analysis) or can be produced by the code that implements the model. A Bayesian approach in which the random function that represents prior uncertainty about y0 is taken to be a stationary Gaussian stochastic process is used. The calculations needed to update the prior given observations of y0 and its first derivatives at the design sites are given and are illustrated in a small example. The issue of experimental design is also discussed, in particular the criterion of maximizing the reduction in entropy, which leads to a kind of D optimality. It is shown that, for certain classes of correlation functions in which the intersite correlations are very weak, D-optimal designs necessarily maximize the minimim distance between design sites. A simulated annealing algorithm is described for constructing such maximin distance designs, An example is given based on a demonstration model of eight inputs and one output, in which predictions based on a maximin design, a Latin hypercube design, and two compromise designs are evaluated and compared. C1 UNIV CALIF LOS ANGELES,DEPT MATH,LOS ANGELES,CA 90024. RP MORRIS, MD (reprint author), OAK RIDGE NATL LAB,DIV EPM,MATH SCI SECT,OAK RIDGE,TN 37831, USA. NR 30 TC 131 Z9 134 U1 2 U2 11 PU AMER STATISTICAL ASSOC PI ALEXANDRIA PA 1429 DUKE ST, ALEXANDRIA, VA 22314 SN 0040-1706 J9 TECHNOMETRICS JI Technometrics PD AUG PY 1993 VL 35 IS 3 BP 243 EP 255 DI 10.2307/1269517 PG 13 WC Statistics & Probability SC Mathematics GA LN577 UT WOS:A1993LN57700001 ER PT J AU KVAM, PH SAMANIEGO, FJ AF KVAM, PH SAMANIEGO, FJ TI LIFE TESTING IN VARIABLY SCALED ENVIRONMENTS SO TECHNOMETRICS LA English DT Article DE ACCELERATED LIFE TESTING; EXPONENTIAL DISTRIBUTIONS; FACTORIAL EXPERIMENTS; GAUSS-SEIDEL ITERATIONS; IDENTIFIABILITY; LIKELIHOOD RATIO TEST; MAXIMUM LIKELIHOOD ESTIMATION ID COMMON ENVIRONMENT; COMPONENTS; SYSTEM AB Typically, accelerated life-testing models postulate a specific functional relationship between the stress level at which an experiment is performed and the parameters of the assumed family of lifetime distributions. These models, and the statistical analyses that accompany them, are often criticized on the basis of the dubious validity of the assumed functional relationship and of the uncertainty involved in the extrapolation of experimental results to low stress levels at which little or no data have been obtained. This study focuses on an exponential factorial model for accelerated life tests that postulates that the lifetime distributions of different component types tested under varying environmental conditions are linked via environmental or component-related scale changes. Necessary and sufficient conditions are given for the identifiability of model parameters. For both censored and complete data, the derivation and properties of maximum likelihood estimates of these parameters are discussed in detail. Under the conditions that guarantee identifiability, the existence and the uniqueness of the maximum likelihood estimators are demonstrated, and their computation and large-sample behavior are discussed. In the final section, the model is fitted to published data from an accelerated life-testing experiment. C1 UNIV CALIF DAVIS,DIV STAT,DAVIS,CA 95616. RP KVAM, PH (reprint author), LOS ALAMOS NATL LAB,STAT GRP A1,LOS ALAMOS,NM 87545, USA. NR 22 TC 4 Z9 4 U1 0 U2 0 PU AMER STATISTICAL ASSOC PI ALEXANDRIA PA 1429 DUKE ST, ALEXANDRIA, VA 22314 SN 0040-1706 J9 TECHNOMETRICS JI Technometrics PD AUG PY 1993 VL 35 IS 3 BP 306 EP 314 PG 9 WC Statistics & Probability SC Mathematics GA LN577 UT WOS:A1993LN57700007 ER PT J AU DEES, C TRAVIS, C AF DEES, C TRAVIS, C TI THE MITOGENIC POTENTIAL OF TRICHLOROETHYLENE IN B6C3F1 MICE SO TOXICOLOGY LETTERS LA English DT Article DE DNA SYNTHESIS; MITOSIS; CARCINOGENICITY; PHARMACOKINETIC MODELING ID MACROMOLECULAR INTERACTIONS; PHARMACOKINETICS; RATS AB Male and female B6C3F1 mice were given TCE by gavage for 10 days. No histopathologic changes in the livers from control male and female mice were found. Moderate changes around central veins were noted in male or female mice that received 1000 mg/kg/body weight TCE. Histopathological changes included an increase in cytoplasmic eosinophilic staining and apoptoses around the central veins. Mitosis and DNA synthesis were examined using incorporation of [H-3]thymidine into liver cells. Incorporation of [H-3]thymidine was significantly increased in the DNA of animals receiving TCE. Total liver DNA extracted from TCA-treated mice was not significantly different than those of control groups. Autoradiographic examination of liver sections showed that the incorporation of label in control animals was primarily in peri-sinusoidal cells. The majority of radiolabel incorporation in TCE-treated mice was found in intermediate zone cells that appeared to be mature hepatocytes. No outstanding differences in the distribution of radio-label in the liver from male or female mice were noted. When incorporation of [H-3]thymidine was quantified by enumeration of labeled hepatocytes following autoradiography, incorporation of the radiolabel into hepatocytes increased proportionally to the applied dose of TCE, but did not increase in peri-sinusoidal cells. Increased mitotic figures in intermediate zone cells resembling mature hepatocytes were found in all mice treated with TCE. These results suggest that liver cell DNA synthesis and mitosis are stimulated by TCE and that these effects may be in part responsible for transformation of liver cells in these mice. RP DEES, C (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,RISK ANAL SECT,POB 2008,MS-6109 BLDG 45005,OAK RIDGE,TN 37831, USA. NR 10 TC 18 Z9 18 U1 0 U2 0 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0378-4274 J9 TOXICOL LETT JI Toxicol. Lett. PD AUG PY 1993 VL 69 IS 2 BP 129 EP 137 DI 10.1016/0378-4274(93)90098-I PG 9 WC Toxicology SC Toxicology GA LZ879 UT WOS:A1993LZ87900003 PM 8212055 ER PT J AU WOODRUFF, TJ BOIS, FY AF WOODRUFF, TJ BOIS, FY TI OPTIMIZATION ISSUES IN PHYSIOLOGICAL TOXICOKINETIC MODELING - A CASE-STUDY WITH BENZENE SO TOXICOLOGY LETTERS LA English DT Article DE TOXICOKINETIC MODEL; OPTIMIZATION METHOD; MONTE-CARLO SIMULATION; BENZENE ID PHARMACOKINETIC MODELS; INHALATION PHARMACOKINETICS; METHYLENE-CHLORIDE; RISK ASSESSMENT; METABOLISM; RATS; SENSITIVITY; DISPOSITION; SIMULATION; LIKELIHOOD AB This paper compares two methods for global optimization of physiologically based toxicokinetic models: Monte Carlo optimization, which searches randomly for the optimum; and the simplex method, which updates systematically an array of parameter values. Two measures of goodness-of-fit are also contrasted: criterion function and likelihood. A 14-parameter model of benzene distribution in rats is used to illustrate these techniques. Simplex optimization yields better fits overall. However, the measurement of uncertainty offered by Monte Carlo simulations is a major argument in favor of their use. C1 LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. RP WOODRUFF, TJ (reprint author), UNIV CALIF SAN FRANCISCO,INST HLTH POLICY STUDIES,1388 SUTTER ST,11TH FLOOR,SAN FRANCISCO,CA 94109, USA. RI Bois, Frederic/E-9241-2012 OI Bois, Frederic/0000-0002-4154-0391 FU NIEHS NIH HHS [P42 ES04705] NR 35 TC 23 Z9 23 U1 0 U2 1 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0378-4274 J9 TOXICOL LETT JI Toxicol. Lett. PD AUG PY 1993 VL 69 IS 2 BP 181 EP 196 DI 10.1016/0378-4274(93)90103-5 PG 16 WC Toxicology SC Toxicology GA LZ879 UT WOS:A1993LZ87900008 PM 8212060 ER PT J AU PACIORNIK, S KILAAS, R DAHMEN, U AF PACIORNIK, S KILAAS, R DAHMEN, U TI ASSESSMENT OF SPECIMEN NOISE IN HREM IMAGES OF SIMPLE STRUCTURES SO ULTRAMICROSCOPY LA English DT Article ID ELECTRON-MICROSCOPY; RESOLUTION AB Displacements of image spots representing atomic columns in a high resolution image may be due either to displacements of atomic columns or to specimen noise. The effect of specimen noise on the accuracy with which an atomic column can be located is assessed by evaluating the root mean square deviation of the intensity center of mass of image dots. Optimized methods for experimental assessment of this effect are developed and applied to simulated and experimental images. RP PACIORNIK, S (reprint author), LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,MSD,BERKELEY,CA 94720, USA. RI Paciornik, Sidnei/E-4939-2012 OI Paciornik, Sidnei/0000-0001-6520-2007 NR 17 TC 14 Z9 14 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD AUG PY 1993 VL 50 IS 3 BP 255 EP 262 DI 10.1016/0304-3991(93)90194-3 PG 8 WC Microscopy SC Microscopy GA LX399 UT WOS:A1993LX39900003 ER PT J AU ORNES, WH SAJWAN, KS AF ORNES, WH SAJWAN, KS TI CADMIUM ACCUMULATION AND BIOAVAILABILITY IN COONTAIL (CERATOPHYLLUM-DEMERSUM L) PLANTS SO WATER AIR AND SOIL POLLUTION LA English DT Article ID METAL AB The aquatic vascular plant (Ceratophyllum demersum L.) was investigated as a potential biological filter for removal of Cd from wastewaters. Plants were grown in and harvested weekly from 0.10 M Hoagland nutrient solutions containing concentrations of Cd from 0.01 to 1.03 mug Cd mL-1. Tissue Cd was positively correlated to increased concentrations of Cd in solution. Concentration factors (CFs) of Cd in plants after one week were 13.3 for the 0.01 mug Cd mL-1 treatment; 451.4 for plants treated with 0.04 mug Cd mL-1, and 506.5 for plants treated with 1.03 mug Cd mL-1. Plants treated with 0.01 mug Cd mL-1 sustained tissue Cd concentrations almost 9-fold over those at week 1. However, after 5 weeks tissue Cd concentration in plants exposed to 1.03 mug Cd mL-1 had decreased 97% compared to the week 1 concentration. Growth measurements of dry weight, stem lengths, and lateral shoot growth were nagatively correlated to increased Cd treatments. Our results suggest that Coontail exposed to very low Cd concentrations (0.01 mug Cd mL-1) can take up and accumulate Cd. However, plants exposed to Cd at 0.04 mug Cd mL-1 or above did not accumulate Cd past one week. C1 UNIV S CAROLINA,BELLE W BARUCH INST MARINE BIOL & COASTAL RES,COLUMBIA,SC 29208. SAVANNAH RIVER ECOL LAB,AIKEN,SC 29801. RP ORNES, WH (reprint author), UNIV S CAROLINA,DEPT BIOL,AIKEN,SC 29801, USA. NR 24 TC 26 Z9 27 U1 0 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD AUG PY 1993 VL 69 IS 3-4 BP 291 EP 300 DI 10.1007/BF00478165 PG 10 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA LV292 UT WOS:A1993LV29200006 ER PT J AU HERLIHY, AT KAUFMANN, PR CHURCH, MR WIGINGTON, PJ WEBB, JR SALE, MJ AF HERLIHY, AT KAUFMANN, PR CHURCH, MR WIGINGTON, PJ WEBB, JR SALE, MJ TI THE EFFECTS OF ACIDIC DEPOSITION ON STREAMS IN THE APPALACHIAN MOUNTAIN AND PIEDMONT REGION OF THE MID-ATLANTIC UNITED-STATES SO WATER RESOURCES RESEARCH LA English DT Article ID ATMOSPHERIC DEPOSITION; SULFUR RETENTION; SURFACE WATERS; ACIDIFICATION; CHEMISTRY; ALKALINITY; POPULATION; PATTERNS; VIRGINIA; GEOLOGY AB Streams in the Appalachian Mountain area of the mid-Atlantic receive some of the largest acidic deposition loadings of any region of the United States. A synthesis of the survey data from the mid-Appalachians yields a consistent picture of the acid base status of streams. Acidic streams, and streams with very low acid neutralizing capacity (ANC), are almost all located in small (<20 km2), upland, forested catchments in areas of base-poor bedrock. In the subpopulation of upland forested systems, which comprises about half the total stream population in the mid-Appalachian area, data from various local surveys show that 6-27% of the streams are acidic, and about 25-50% have ANC less than 50 mueq L-1. After excluding streams with acid mine drainage, National Stream Survey estimates for the whole region show that there are 2330 km of acidic streams and 7500 km of streams with ANC less than 50 mueq L-1. Many of the streams with base flow ANC less than 50 mueq L-1 become acidic during storm or snowmelt episodes. Sulfate from atmospheric deposition is the dominant source of strong acid anions in acidic mid-Appalachian streams. Their low pH (median, 4.9) and high levels of inorganic monomeric aluminum (median, 129 mug L-1) leached through soils by acidic deposition are causing damage to aquatic biota. Quantification of the extent of biological effects, however, is not possible with available data. Localized studies have shown that stream water ANC is closely related to bedrock mineralogy. Attempts to quantify this relationship across the mid-Appalachians, however, were frustrated by the lack of adequate scale geologic mapping throughout the region. Sulfate mass balance analyses indicate that soils and surface waters of the region have not yet realized the full effects of elevated sulfur deposition due to watershed sulfate retention. Sulfur retention is likely to decrease in the future, resulting in further losses of stream ANC. C1 OREGON STATE UNIV,DEPT FISHERIES & WILDLIFE,CORVALLIS,OR 97331. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV VIRGINIA,DEPT ENVIRONM SCI,CHARLOTTESVILLE,VA 22903. RP HERLIHY, AT (reprint author), OREGON STATE UNIV,US EPA,ENVIRONM RES LAB,200 SW 35TH ST,CORVALLIS,OR 97331, USA. NR 70 TC 54 Z9 55 U1 2 U2 11 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD AUG PY 1993 VL 29 IS 8 BP 2687 EP 2703 DI 10.1029/93WR01072 PG 17 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA LR884 UT WOS:A1993LR88400018 ER PT J AU MCNAB, WW NARASIMHAN, TN AF MCNAB, WW NARASIMHAN, TN TI A MULTIPLE SPECIES TRANSPORT MODEL WITH SEQUENTIAL DECAY CHAIN INTERACTIONS IN HETEROGENEOUS SUBSURFACE ENVIRONMENTS SO WATER RESOURCES RESEARCH LA English DT Article ID MULTICOMPONENT MASS-TRANSPORT; GROUNDWATER CONTAMINATION; NUMERICAL ALGORITHM; CHEMICAL-TRANSPORT; TRANSFORMATIONS; CHEMISTRY; HYDROLYSIS; ALDICARB; ETHENES; CHOICE AB The spatial and temporal distribution of solutes in groundwater is controlled by several physical and chemical processes. Among the chemical processes, sequential degradation phenomena play an important role in determining the fate of radioactive materials and certain types of organic compounds. We present a numerical model designed to evaluate the simultaneous transport and kinetically controlled sequential degradation (straight and branched chains) of several dissolved components in groundwater systems. The model utilizes a two-step quasi-linearization algorithm to solve the equations of chemical transport and transformation. The transport equations are solved explicitly using the integral finite difference method. The chemical transformation equations are solved using an implicit finite difference (in time) algorithm for each volume element in the discretized flow domain. Although this algorithm is designed to solve problems involving first-order kinetics, it may be modified in certain instances to accommodate rate mechanisms other than first order. The chemical transformation module and the transport module are coupled via a source/sink term in the transport equation. This combination results in a numerical code that is computationally efficient. We have found that the model yields solutions which are in excellent agreement with available analytical solutions. Solution of a test problem based on the sequential degradation of the pesticide aldicarb demonstrates that the model can provide useful insights into the fate of solutes subject to certain degradation regimes in heterogeneous groundwater systems. Although the illustrative examples presented are one dimensional, the model itself is capable of handling two- and three-dimensional problems. In addition, the modular structure of the model is built upon user-specified chemical reactions. This allows for flexibility in problem definition, which may accommodate both reversible and irreversible reactions. C1 LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720. RP MCNAB, WW (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,364 HEARST MIN BLDG,BERKELEY,CA 94720, USA. NR 25 TC 17 Z9 17 U1 0 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD AUG PY 1993 VL 29 IS 8 BP 2737 EP 2746 DI 10.1029/93WR00964 PG 10 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA LR884 UT WOS:A1993LR88400022 ER PT J AU DRUMHELLER, DS AF DRUMHELLER, DS TI COUPLED EXTENSIONAL AND BENDING MOTION IN ELASTIC WAVE-GUIDES SO WAVE MOTION LA English DT Article AB A variety of different linear elastic waves propagate in long slender rods. These waves do not interact in straight rods; however, extensional and bending waves do interact in slightly curved rods. If curved rods are used as waveguides for extensional waves, wave energy is exchanged between extensional and bending waves. The result has the superficial appearance of viscous attenuation. The petroleum and geothermal industries have an interest in using drill pipe as a waveguide to transmit data by acoustic waves. Attempts have been made to transmit data from transducers in the vicinity of a drill bit to the drill rig at the surface. These efforts have not been successful. Poor signal strength is a major problem. Historically, the observed reduction in signal strength is attributed to viscous dissipation. This paper proposes an alternative model - mode conversion from extensional waves to bending waves. This model is analyzed both as an eigenvalue problem and a transient finite-difference problem. The results predict measured attenuation levels, and account for many anomalous observations. RP DRUMHELLER, DS (reprint author), SANDIA NATL LABS,GEOTHERMAL RES DEPT,ALBUQUERQUE,NM 87185, USA. NR 6 TC 9 Z9 9 U1 2 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-2125 J9 WAVE MOTION JI Wave Motion PD AUG PY 1993 VL 17 IS 4 BP 319 EP 327 DI 10.1016/0165-2125(93)90011-4 PG 9 WC Acoustics; Mechanics; Physics, Multidisciplinary SC Acoustics; Mechanics; Physics GA MC948 UT WOS:A1993MC94800002 ER PT J AU BARRETTE, J BELLWIED, R BRAUNMUNZINGER, P CLELAND, WE CORMIER, TM DAVID, G DEE, J DIEBOLD, GE DIETZSCH, O GERMANI, JV GILBERT, S GREENE, SV HALL, JR HEMMICK, TK HERRMANN, N HONG, B JAYANANDA, K KRAUS, D KUMAR, BS LACASSE, R LISSAUER, D LLOPE, WJ LUDLAM, TW MCCORKLE, S MAJKA, R MARK, SK MITCHELL, JT MUTHUSWAMY, M OBRIEN, E PRUNEAU, C RAO, MN ROTONDO, F SANDWEISS, J DASILVA, NC SONNADARA, U STACHEL, J TAKAI, H TAKAGUI, EM THROWE, TG WINTER, C WANG, G WOLFE, D WOODY, CL XU, N ZHANG, Y ZHANG, Z ZOU, C AF BARRETTE, J BELLWIED, R BRAUNMUNZINGER, P CLELAND, WE CORMIER, TM DAVID, G DEE, J DIEBOLD, GE DIETZSCH, O GERMANI, JV GILBERT, S GREENE, SV HALL, JR HEMMICK, TK HERRMANN, N HONG, B JAYANANDA, K KRAUS, D KUMAR, BS LACASSE, R LISSAUER, D LLOPE, WJ LUDLAM, TW MCCORKLE, S MAJKA, R MARK, SK MITCHELL, JT MUTHUSWAMY, M OBRIEN, E PRUNEAU, C RAO, MN ROTONDO, F SANDWEISS, J DASILVA, NC SONNADARA, U STACHEL, J TAKAI, H TAKAGUI, EM THROWE, TG WINTER, C WANG, G WOLFE, D WOODY, CL XU, N ZHANG, Y ZHANG, Z ZOU, C TI BARYON DISTRIBUTIONS IN ULTRARELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID HEAVY-ION COLLISIONS; TRANSPARENCY; FLOW AB We have measured distributions in transverse momentum and rapidity of protons from interactions of 14.6 GeV/nucleon Si-28 projectiles with targets of Al and Pb. The transverse momentum spectra exhibit a thermal shape with a rapidity dependent temperature parameter. For very central or violent collisions the proton rapidity distributions exhibit the large rapidity shifts and (for Si + Al) a peak at midrapidity as required for full stopping. C1 GESELL SCHWERIONENFORSCH MBH,W-6100 DARMSTADT,GERMANY. MCGILL UNIV,MONTREAL H3A 2T5,QUEBEC,CANADA. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. UNIV SAO PAULO,SAO PAULO,BRAZIL. UNIV PITTSBURGH,PITTSBURGH,PA 15260. SUNY,STONY BROOK,NY 11794. WAYNE STATE UNIV,DETROIT,MI 48202. YALE UNIV,NEW HAVEN,CT 06511. RP BARRETTE, J (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Sonnadara, Upul/E-6359-2010; Takai, Helio/C-3301-2012; OI Takai, Helio/0000-0001-9253-8307; Sonnadara, Upul/0000-0001-7862-2537 NR 17 TC 20 Z9 20 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD AUG PY 1993 VL 59 IS 2 BP 211 EP 214 PG 4 WC Physics, Particles & Fields SC Physics GA LR517 UT WOS:A1993LR51700003 ER PT J AU BUSKULIC, D DECAMP, D GOY, C LEES, JP MINARD, MN MOURS, B PIETRZYK, B ALEMANY, R ARIZTIZABAL, F COMAS, P CRESPO, JM DELFINO, M FERNANDEZ, E FERNANDEZBOSMAN, M GAITAN, V GARRIDO, L MATTISON, T PACHECO, A PADILLA, C PASCUAL, A CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G CHAI, Y HU, H HUANG, D HUANG, X LIN, J WANG, T XIE, Y XU, D XU, R ZHANG, J ZHANG, L ZHAO, W BAUERDICK, LAT BLUCHER, E BONVICINI, G BOUDREAU, J CASPER, D DREVERMANN, H FORTY, RW GANIS, G GAY, C HAGELBERG, R HARVEY, J HAYWOOD, S HILGART, J JACOBSEN, R JOST, B KNOBLOCH, J LEHRAUS, I LOHSE, T LUSIANI, A MARTINEZ, M MATO, P MEINHARD, H MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG PALAZZI, P PERLAS, JA PUSZTASZERI, JF RANJARD, F REDLINGER, G ROLANDI, L ROTHBERG, J RUAN, T SAICH, M SCHLATTER, D SCHMELLING, M SEFKOW, F TEJESSY, W WACHSMUTH, H WIEDENMANN, W WILDISH, T WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PODLYSKI, F PRORIOL, J PRULHIERE, F SAADI, F FEARNLEY, T HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I KYRIAKIS, A SIMOPOULOU, E VAYAKI, A ZACHARIADOU, K BADIER, J BLONDEL, A BONNEAUD, G BRIENT, JC FOUQUE, G ORTEU, S ROUGE, A RUMPF, M TANAKA, R VERDERI, M VIDEAU, H CANDLIN, DJ PARSONS, MI VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L WASSERBAECH, S ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G BOSSI, F CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P COLRAIN, P TENHAVE, I LYNCH, JG MAITLAND, W MORTON, WT RAINE, C REEVES, P SCARR, JM SMITH, K SMITH, MG THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M COLLING, DJ DORNAN, PJ GREENE, AM HASSARD, JF LIESKE, NM MOUTOUSSI, A NASH, J PATTON, S PAYNE, DG PHILLIPS, MJ SANMARTIN, G SEDGBEER, JK TOMALIN, IR WRIGHT, AG GIRTLER, P KNERINGER, E KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G JACKSON, D KEEMER, NR NUTTALL, M PATEL, A SLOAN, T SNOW, SW WHELAN, EP BENCHEIKH, AM BENCHOUK, C BONISSENT, A CARR, J COYLE, P DRINKARD, J ETIENNE, F NICOD, D PAPALEXIOU, S PAYRE, P ROOS, L ROUSSEAU, D SCHWEMMLING, P TALBY, M ADLUNG, S ASSMANN, R BAUER, C BLUM, W BROWN, D CATTANEO, P DEHNING, B DIETL, H DYDAK, F FRANK, M HELLEY, AW LAUBER, J LUTJENS, G LUTZ, G MANNER, W RICHTER, R ROTSCHEIDT, H SCHRODER, J SCHWARZ, AS SETTLES, R SEYWARD, H STIERLIN, U STIEGLER, U DENIS, RS WOLF, G BOUCROT, J CALLOT, O CORDIER, A DAVIER, M DUFLOT, L GRIVAZ, JF HEUSSE, P JAFFE, DE JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM SCHUNE, MH VEILLET, JJ VIDEAU, I ZHANG, Z ABBANEO, D BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BOZZI, C CALDERINI, G CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GIASSI, A GIORGI, MA GREGORIO, A LIGABUE, F MANNELLI, EB MARROCCHESI, PS MESSINEO, A PALLA, F RIZZO, G SANGUINETTI, G SPAGNOLO, P STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J BETTERIDGE, AP CARTER, JM GREEN, MG MARCH, PV MIR, LM MEDCALF, T QUAZI, IS STRONG, JA WEST, LR BOTTERILL, DR CLIFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P DUARTE, H KOZANECKI, W LANCON, E LEMAIRE, MC LOCCI, E PEREZ, P PERRIER, F RANDER, J RENARDY, JF ROSOWSKY, A ROUSSARIE, A SCHULLER, JP SCHWINDLING, J MOHAND, DS VALLAGE, B JOHNSON, RP LITKE, AM TAYLOR, G WEAR, J ASHMAN, JG BABBAGE, W BOOTH, CN BUTTAR, C CARNEY, RE CARTWRIGHT, S COMBLEY, F HATFIELD, F THOMPSON, LF BARBERIO, E BOHRER, A BRANDT, S COWAN, G GRUPEN, C LUTTERS, G RIVERA, F SCHAFER, U SMOLIK, L TRIER, H DELLAMARIA, R GIANNINI, G GOBBO, B RAGUSA, F BELLANTONI, L CHEN, W CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JARED, RC LECLAIRE, BW LISHKA, C PAN, YB PATER, JR SAADI, Y SCHMITT, M SHARMA, V SHI, ZH WALSH, AM WEBER, FV WU, SL WU, X ZHENG, M ZOBERNIG, G AF BUSKULIC, D DECAMP, D GOY, C LEES, JP MINARD, MN MOURS, B PIETRZYK, B ALEMANY, R ARIZTIZABAL, F COMAS, P CRESPO, JM DELFINO, M FERNANDEZ, E FERNANDEZBOSMAN, M GAITAN, V GARRIDO, L MATTISON, T PACHECO, A PADILLA, C PASCUAL, A CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G CHAI, Y HU, H HUANG, D HUANG, X LIN, J WANG, T XIE, Y XU, D XU, R ZHANG, J ZHANG, L ZHAO, W BAUERDICK, LAT BLUCHER, E BONVICINI, G BOUDREAU, J CASPER, D DREVERMANN, H FORTY, RW GANIS, G GAY, C HAGELBERG, R HARVEY, J HAYWOOD, S HILGART, J JACOBSEN, R JOST, B KNOBLOCH, J LEHRAUS, I LOHSE, T LUSIANI, A MARTINEZ, M MATO, P MEINHARD, H MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG PALAZZI, P PERLAS, JA PUSZTASZERI, JF RANJARD, F REDLINGER, G ROLANDI, L ROTHBERG, J RUAN, T SAICH, M SCHLATTER, D SCHMELLING, M SEFKOW, F TEJESSY, W WACHSMUTH, H WIEDENMANN, W WILDISH, T WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PODLYSKI, F PRORIOL, J PRULHIERE, F SAADI, F FEARNLEY, T HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I KYRIAKIS, A SIMOPOULOU, E VAYAKI, A ZACHARIADOU, K BADIER, J BLONDEL, A BONNEAUD, G BRIENT, JC FOUQUE, G ORTEU, S ROUGE, A RUMPF, M TANAKA, R VERDERI, M VIDEAU, H CANDLIN, DJ PARSONS, MI VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L WASSERBAECH, S ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G BOSSI, F CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P COLRAIN, P TENHAVE, I LYNCH, JG MAITLAND, W MORTON, WT RAINE, C REEVES, P SCARR, JM SMITH, K SMITH, MG THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M COLLING, DJ DORNAN, PJ GREENE, AM HASSARD, JF LIESKE, NM MOUTOUSSI, A NASH, J PATTON, S PAYNE, DG PHILLIPS, MJ SANMARTIN, G SEDGBEER, JK TOMALIN, IR WRIGHT, AG GIRTLER, P KNERINGER, E KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G JACKSON, D KEEMER, NR NUTTALL, M PATEL, A SLOAN, T SNOW, SW WHELAN, EP BENCHEIKH, AM BENCHOUK, C BONISSENT, A CARR, J COYLE, P DRINKARD, J ETIENNE, F NICOD, D PAPALEXIOU, S PAYRE, P ROOS, L ROUSSEAU, D SCHWEMMLING, P TALBY, M ADLUNG, S ASSMANN, R BAUER, C BLUM, W BROWN, D CATTANEO, P DEHNING, B DIETL, H DYDAK, F FRANK, M HELLEY, AW LAUBER, J LUTJENS, G LUTZ, G MANNER, W RICHTER, R ROTSCHEIDT, H SCHRODER, J SCHWARZ, AS SETTLES, R SEYWARD, H STIERLIN, U STIEGLER, U DENIS, RS WOLF, G BOUCROT, J CALLOT, O CORDIER, A DAVIER, M DUFLOT, L GRIVAZ, JF HEUSSE, P JAFFE, DE JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM SCHUNE, MH VEILLET, JJ VIDEAU, I ZHANG, Z ABBANEO, D BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BOZZI, C CALDERINI, G CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GIASSI, A GIORGI, MA GREGORIO, A LIGABUE, F MANNELLI, EB MARROCCHESI, PS MESSINEO, A PALLA, F RIZZO, G SANGUINETTI, G SPAGNOLO, P STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J BETTERIDGE, AP CARTER, JM GREEN, MG MARCH, PV MIR, LM MEDCALF, T QUAZI, IS STRONG, JA WEST, LR BOTTERILL, DR CLIFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P DUARTE, H KOZANECKI, W LANCON, E LEMAIRE, MC LOCCI, E PEREZ, P PERRIER, F RANDER, J RENARDY, JF ROSOWSKY, A ROUSSARIE, A SCHULLER, JP SCHWINDLING, J MOHAND, DS VALLAGE, B JOHNSON, RP LITKE, AM TAYLOR, G WEAR, J ASHMAN, JG BABBAGE, W BOOTH, CN BUTTAR, C CARNEY, RE CARTWRIGHT, S COMBLEY, F HATFIELD, F THOMPSON, LF BARBERIO, E BOHRER, A BRANDT, S COWAN, G GRUPEN, C LUTTERS, G RIVERA, F SCHAFER, U SMOLIK, L TRIER, H DELLAMARIA, R GIANNINI, G GOBBO, B RAGUSA, F BELLANTONI, L CHEN, W CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JARED, RC LECLAIRE, BW LISHKA, C PAN, YB PATER, JR SAADI, Y SCHMITT, M SHARMA, V SHI, ZH WALSH, AM WEBER, FV WU, SL WU, X ZHENG, M ZOBERNIG, G TI SEARCH FOR CONTACT INTERACTIONS IN THE REACTIONS E+E--]L+L- AND E+E--]GAMMA-GAMMA SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID SEMILEPTONIC NEUTRINO SCATTERING; PRECISE DETERMINATION; BHABHA SCATTERING; E+E ANNIHILATION; PAIR PRODUCTION; ALEPH DETECTOR; GAMMA-GAMMA; LEP; COMPOSITENESS; DISTRIBUTIONS AB Contact interactions are searched for using the differential cross sections for the reactions e+e- --> e+e-, e+e- --> mu+mu-, e+e- --> tau+tau- and e+e --> gammagamma measured at 12 energies around the Z peak and corresponding to about 20 pb-1 of cumulated luminosity. Four-fermion contact term models assuming various chiralities of lepton currents are fitted to the lepton data and lower limits on the energy scale LAMBDA of such terms are set at 95% c.l. The limits vary in the range 0.9-4.7 TeV, depending on the model and on the lepton flavour. The eegammagamma contact terms are searched for assuming various chiralities. Limits on the energy scale LAMBDA between 79 and 130 GeV are extracted from the data. The results are compared and combined with those reported at lower energies. C1 UNIV BARI, DEPT FIS, I-70126 BARI, ITALY. UNIV BARI, INFN, SEZ BARI, I-70126 BARI, ITALY. CHINESE ACAD SCI, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. UNIV CLERMONT FERRAND, PHYS CORPUSCULAIRE LAB, CNRS, F-63177 CLERMONT FERRAND, FRANCE. NIELS BOHR INST, DK-2100 COPENHAGEN, DENMARK. DEMOCRITOS NUCL RES CTR, ATHENS, GREECE. 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UNIV TURIN, 1ST FIS GEN, I-10124 TURIN, ITALY. UNIV AUTONOMA BARCELONA, INST FIS ALTES ENERGIES, E-08193 BARCELONA, SPAIN. RP BUSKULIC, D (reprint author), LAB PHYS PARTICULES, CNRS, IN2P3, F-74019 ANNECY LE VIEUX, FRANCE. RI Fernandez, Enrique/L-5387-2014; Mir, Lluisa-Maria/G-7212-2015; ciocci, maria agnese /I-2153-2015; Hansen, John/B-9058-2015; Lusiani, Alberto/N-2976-2015; Marrocchesi, Pier Simone/N-9068-2015; Lusiani, Alberto/A-3329-2016; Murtas, Fabrizio/B-5729-2012; Booth, Christopher/B-5263-2016; Pacheco Pages, Andres/C-5353-2011; Assmann, Ralph/L-8457-2016; Ferrante, Isidoro/F-1017-2012; ANTONELLI, ANTONELLA/C-6238-2011; Buttar, Craig/D-3706-2011; Stahl, Achim/E-8846-2011; Passalacqua, Luca/F-5127-2011; Forti, Francesco/H-3035-2011; Focardi, Ettore/E-7376-2012; Gregorio, Anna/J-1632-2012; Venturi, Andrea/J-1877-2012; Perrier, Frederic/A-5953-2011; Rolandi, Luigi (Gigi)/E-8563-2013; Colas, Paul/F-2876-2013; Delfino, Manuel/A-1545-2012; Bosman, Martine/J-9917-2014; Ligabue, Franco/F-3432-2014; Rizzo, Giuliana/A-8516-2015 OI Fernandez, Enrique/0000-0002-6405-9488; Mir, Lluisa-Maria/0000-0002-4276-715X; ciocci, maria agnese /0000-0003-0002-5462; Hansen, John/0000-0002-8422-5543; Lusiani, Alberto/0000-0002-6876-3288; Marrocchesi, Pier Simone/0000-0003-1966-140X; Lusiani, Alberto/0000-0002-6876-3288; Booth, Christopher/0000-0002-6051-2847; Pacheco Pages, Andres/0000-0001-8210-1734; Ferrante, Isidoro/0000-0002-0083-7228; Stahl, Achim/0000-0002-8369-7506; Forti, Francesco/0000-0001-6535-7965; Focardi, Ettore/0000-0002-3763-5267; Rolandi, Luigi (Gigi)/0000-0002-0635-274X; Delfino, Manuel/0000-0002-9468-4751; Bosman, Martine/0000-0002-7290-643X; Palazzi, Paolo/0000-0002-4861-391X; RASO, Giuseppe/0000-0002-5660-3711; Gregorio, Anna/0000-0003-4028-8785; Seywerd, Henry/0000-0003-4876-730X; Bottigli, Ubaldo/0000-0002-0666-3433; Ligabue, Franco/0000-0002-1549-7107; Bloch-Devaux, Brigitte/0000-0002-2463-1232; Rizzo, Giuliana/0000-0003-1788-2866 NR 31 TC 17 Z9 17 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. 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GUIDA, M IORI, M MARI, SM MARINI, G MATTIOLI, M NIGRO, A HART, JC MCCUBBIN, NA PRYTZ, K SHAH, TP SHORT, TL BARBERIS, E CARTIGLIA, N HEUSCH, C HUBBARD, B LESLIE, J LOCKMAN, W OSHAUGHNESSY, K SADROZINSKI, HF SEIDEN, A ZERZION, D BADURA, E BILTZINGER, J SEIFERT, RJ WALENTA, AH ZECH, G DAGAN, S LEVY, A HASEGAWA, T HAZUMI, M ISHII, T KASAI, S KUZE, M NAGASAWA, Y NAKAO, M OKUNO, H TOKUSHUKU, K WATANABE, T YAMADA, S CHIBA, M HAMATSU, R HIROSE, T KITAMURA, S NAGAYAMA, S NAKAMITSU, Y CIRIO, R COSTA, M FERRERO, MI LAMBERTI, L MASELLI, S PERONI, C SOLANO, A STAIANO, A DARDO, M BAILEY, DC BANDYOPADHYAY, D BENARD, F BHADRA, S BRKIC, M BUROW, BD CHLEBANA, FS CROMBIE, MB HARTNER, GF LEVMAN, GM MARTIN, JF ORR, RS PRENTICE, JD SAMPSON, CR STAIRS, GG TEUSCHER, RJ YOON, TS BULLOCK, FW CATTERALL, CD GIDDINGS, JC JONES, TW KHAN, AM LANE, JB MAKKAR, PL SHAW, D SHULMAN, J BLANKENSHIP, K KOCHOCKI, J LU, B MO, LW CHARCHULA, K CIBOROWSKI, J GAJEWSKI, J GRZELAK, G KASPRZAK, M KRZYZANOWSKI, M MUCHOROWSKI, K NOWAK, RJ PAWLAK, JM STOPCZYNSKI, A TYMIENIECKA, T WALCZAK, R WROBLEWSKI, AK ZAKRZEWSKI, JA ZARNECKI, AF ADAMUS, M ABRAMOWICZ, H EISENBERG, Y GLASMAN, C KARSHON, U MONTAG, A REVEL, D SHAPIRA, A FOUDAS, C FORDHAM, C LOVELESS, RJ GOUSSIOU, A ALI, I BEHRENS, B DASU, S REEDER, DD SMITH, WH SILVERSTEIN, S FRISKEN, WR FURUTANI, KM IGA, Y TI HADRONIC ENERGY-DISTRIBUTIONS IN DEEP-INELASTIC ELECTRON-PROTON SCATTERING SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID CENTRAL TRACKING DETECTOR; MUON SCATTERING; PARTON SHOWERS; MONTE-CARLO; TRANSVERSE-MOMENTUM; JET PRODUCTION; QCD CASCADES; ZEUS; FRAGMENTATION; SIMULATION AB This paper presents energy distributions of the hadronic system produced in neutral-current electron-proton deep-inelastic scattering at a centre of mass energy of 296 GeV. 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RI De Pasquale, Salvatore/B-9165-2008; Lancaster, Mark/C-1693-2008; Doyle, Anthony/C-5889-2009; Golubkov, Yury/E-1643-2012; Guida, MIchele/J-4714-2012; Wiggers, Leo/B-5218-2015; Gladilin, Leonid/B-5226-2011; Morandin, Mauro/A-3308-2016; Frasconi, Franco/K-1068-2016; OI De Pasquale, Salvatore/0000-0001-9236-0748; Doyle, Anthony/0000-0001-6322-6195; Lancaster, Mark/0000-0002-8872-7292; Guida, MIchele/0000-0002-1108-5391; Wiggers, Leo/0000-0003-1060-0520; Gladilin, Leonid/0000-0001-9422-8636; Morandin, Mauro/0000-0003-4708-4240; Frasconi, Franco/0000-0003-4204-6587; Castellini, Guido/0000-0002-0177-0643; Anzivino, Giuseppina/0000-0002-5967-0952; iori, maurizio/0000-0002-6349-0380 NR 40 TC 32 Z9 32 U1 1 U2 2 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. 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RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TOME, B TORASSA, E TORTORA, L TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEHR, A WEIERSTALL, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J TI MEASUREMENT OF THE TRIPLE-GLUON VERTEX FROM 4-JET EVENTS AT LEP SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID LUND MONTE-CARLO; NON-ABELIAN NATURE; E+E-ANNIHILATION; JET FRAGMENTATION; QCD PREDICTIONS; HADRONIC DECAYS; 3-GLUON VERTEX; FINAL-STATES; PHYSICS; COLLISIONS AB From the combined data of 1990 and 1991 of the DELPHI experiment at LEP, 13057 4-jet events are obtained and used for determining the contribution of the triple-gluon vertex. The relevant variables are the generalized Nachtmann Reiter angle theta(NR)* and the opening angle of the two least energetic jets. A fit to their two-dimensional distribution yields C(A)/C(F)=2.12+/-0.35 and N(C)/N(A)=0.46+/-0.19, where C(A)/C(F) is the ratio of the coupling strength of the triple-gluon vertex to that of gluon bremsstrahlung from quarks, and N(C)/N(A), the ratio of the number of quark colours to the number of gluons. This constitutes a convincing model-independent proof of the existence of the triple-gluon vertex, since its contribution is directly proportional to C(A)/C(F). The results are in agreement with the values expected from QCD: C(A)/C(F)=2.25, and N(C)/N(A)=3/8. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. ULB,VUB,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. INFN,I-40126 BOLOGNA,ITALY. COLL FRANCE,PHYS CORPUSCULAIRE LAB,CNRS,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. CTR RECH NUCL,CNRS,ULP,F-67037 STRASBOURG,FRANCE. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15130 ATHENS,GREECE. FZU,INST PHYS,DIV CAS HIGH ENERGY PHYS,CS-18940 PRAGUE 8,CZECHOSLOVAKIA. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. INFN,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,INST SCI NUCL,CNRS,F-38026 GRENOBLE,FRANCE. SEFT,HIGH ENERGY PHYS RES INST,SF-00170 HELSINKI,FINLAND. DUBNA JOINT NUCL RES INST,HEAD POST OFF,MOSCOW 101000,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE 1,GERMANY. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV PARIS 06,LPNHE,CNRS,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,LPNHE,CNRS,F-75252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV LYON 1,IPNL,CNRS,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,CPP,CNRS,I-20133 MILAN,ITALY. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. INFN,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. CHARLES UNIV,MFF,CTR NUCL,CS-18000 PRAGUE 8,CZECHOSLOVAKIA. 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,DPTO FIS,E-33006 OVIEDO,SPAIN. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. INFN,I-35131 PADUA,ITALY. PONTIFICIA UNIV CATOLICA,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. INFN,I-00173 ROME,ITALY. CENS,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. UNIV SALERNO,DIPARTIMENTO FIS,I-84100 SALERNO,ITALY. IST SUPER SANITA,INFN,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39005 SANTANDER,SPAIN. PROTVINO HIGH ENERGY PHYS INST,PROTVINO,RUSSIA. UNIV LJUBLJANA,DEPT PHYS,LJUBLJANA 61000,SLOVENIA. UNIV LJUBLJANA,J STEFAN INST,LJUBLJANA 61000,SLOVENIA. UNIV STOCKHOLM,INST PHYS,S-11346 STOCKHOLM,SWEDEN. UNIV TORINO,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. INFN,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. INFN,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV VALENCIA,CSIC,IFIC,E-46100 BURJASSOT,SPAIN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. OSTERR AKAD WISSENSCH,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. RP ABREU, P (reprint author), LIP,IST,FCUL,AV GARCIA 14-1,P-1000 LISBON,PORTUGAL. RI Ragazzi, Stefano/D-2463-2009; Roditi, Itzhak/O-7448-2014; Zuniga, Juan/P-4385-2014; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Smirnova, Oxana/A-4401-2013; Fernandez-Alonso, Mercedes/F-2557-2016; Lozano-Bahilo, Julio/F-4881-2016; Olshevskiy, Alexander/I-1580-2016; Paganoni, Marco/A-4235-2016; Botner, Olga/A-9110-2013; Hallgren, Allan/A-8963-2013; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Vaz, Pedro/K-2464-2013; Monge, Maria Roberta/G-9127-2012; Ridky, Jan/H-6184-2014; Zukanovich Funchal, Renata/C-5829-2013; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Pimenta, Mario/M-1741-2013; Gomez Cadenas, Juan Jose/L-2003-2014; Dracos, Marcos/K-2335-2012; de Groot, Nicolo/A-2675-2009; Nomerotski, Andrei/A-5169-2010; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Torassa, Ezio/I-1788-2012; Giacomelli, Paolo/B-8076-2009; Fruhwirth, Rudolf/H-2529-2012; Andreazza, Attilio/E-5642-2011; Verlato, Marco/J-4604-2012; Contreras Gonzalez, Jose Luis/K-7255-2014; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; OI Ragazzi, Stefano/0000-0001-8219-2074; Roditi, Itzhak/0000-0003-2363-5626; Zuniga, Juan/0000-0002-1041-6451; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Smirnova, Oxana/0000-0003-2517-531X; Fernandez-Alonso, Mercedes/0000-0002-1311-5275; 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; Zukanovich Funchal, Renata/0000-0001-6749-0022; Tome, Bernardo/0000-0002-7564-8392; Pimenta, Mario/0000-0002-2590-0908; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Dracos, Marcos/0000-0003-0514-193X; Ruiz, Alberto/0000-0002-3639-0368; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; Andreazza, Attilio/0000-0001-5161-5759; Verlato, Marco/0000-0003-1967-7655; 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; 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 31 TC 44 Z9 44 U1 0 U2 9 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. 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Fields PD AUG PY 1993 VL 59 IS 3 BP 357 EP 368 PG 12 WC Physics, Particles & Fields SC Physics GA LU298 UT WOS:A1993LU29800001 ER PT J AU BUSKULIC, D DECAMP, D GOY, C LEES, JP MINARD, MN MOURS, B PIETRZYK, B ALEMANY, R ARIZTIZABAL, F COMAS, P CRESPO, JM DELFINO, M FENANDEZ, E FERNANDEZBOSMAN, M GAITAN, V GARRIDO, L MATTISON, T PACHECO, A PADILLA, C PASCUAL, A CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G CHAI, Y HU, H HUANG, D HUANG, X LIN, J WANG, T XIE, Y XU, D XU, R ZHANG, J ZHAO, W BAUERDICK, LAT BLUCHER, E BONVICINI, G BOUDREAU, J CASPER, D DREVERMANN, H FORTY, RW GANIS, G GAY, C HAGELBERG, R HARVEY, J HAYWOOD, S HILGART, J JACOBSEN, R JOST, B KNOBLOCH, J LEHRAUS, I LOHSE, T LUSIANI, A MARTINEZ, M MATO, P MEINHARD, H MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG PALAZZI, P PERLAS, JA PUSZTASZERI, JF RANJARD, F REDLINGER, G ROLANDI, L ROTHBERG, J RUAN, T SAICH, M SCHLATTER, D SCHMELLING, M SEFKOW, F TEJESSY, W WACHSMUTH, H WIEDENMANN, W WILDISH, T WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PODLYSKI, F PRORIOL, J PRULHIERE, F SAADI, F FEARNLEY, T HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS CANDLIN, DJ PARSONS, MI VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L WASSERBAECH, S ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G BOSSI, F CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P COLRAIN, P TENHAVE, I LYNCH, JG MAITLAND, W MORTON, WT RAINE, C REEVES, P SCARR, JM SMITH, K SMITH, MG THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M COLLING, DJ DORNAN, PJ DUGEAY, S GREENE, AM HASSAED, JF LIESKE, NM NASH, J PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TOMALIN, IR WRIGHT, AG GIRTLER, P KNERINGER, E KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G JACKSON, D KEEMER, NR NUTTALL, M PATEL, A SLOAN, T SNOW, SW WHELAN, EP EFTHYMIOPOULOS, I KYRIAKIS, A SIMOPOULOU, E VAYAKI, A ZACHARIADOU, K BADIER, J BLONDEL, A BONNEAUD, G BRIENT, JC FOUQUE, G ORTEU, S ROUGE, A RUMPF, M TANAKA, R VERDERI, M VIDEAU, H ADLUNG, S ASSMANN, R BAUER, C BLUM, W BROWN, D CATTANEO, P DEHNING, B DIETL, H DYDAK, F FRANK, M HALLEY, AW LAUBER, J LUTJENS, G LUTZ, G MANNER, W RICHTER, R ROTSCHEIDT, H SCHRODER, J SCHWARZ, AS SETTLES, R SEYWERD, H STIERLIN, U STIEGLER, U STDENIS, R WOLF, G BOUCROT, J CALLOT, O CORDIER, A DAVIER, M DUFLOT, L GRIVAZ, JF HEUSSE, P JAFFE, DE JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM SCHUNE, MH VEILLET, JJ VIDEAU, I ZHANG, Z 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D HUANG, X LIN, J WANG, T XIE, Y XU, D XU, R ZHANG, J ZHAO, W BAUERDICK, LAT BLUCHER, E BONVICINI, G BOUDREAU, J CASPER, D DREVERMANN, H FORTY, RW GANIS, G GAY, C HAGELBERG, R HARVEY, J HAYWOOD, S HILGART, J JACOBSEN, R JOST, B KNOBLOCH, J LEHRAUS, I LOHSE, T LUSIANI, A MARTINEZ, M MATO, P MEINHARD, H MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG PALAZZI, P PERLAS, JA PUSZTASZERI, JF RANJARD, F REDLINGER, G ROLANDI, L ROTHBERG, J RUAN, T SAICH, M SCHLATTER, D SCHMELLING, M SEFKOW, F TEJESSY, W WACHSMUTH, H WIEDENMANN, W WILDISH, T WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PODLYSKI, F PRORIOL, J PRULHIERE, F SAADI, F FEARNLEY, T HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS CANDLIN, DJ PARSONS, MI VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L WASSERBAECH, S ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G BOSSI, F CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P COLRAIN, P TENHAVE, I LYNCH, JG MAITLAND, W MORTON, WT RAINE, C REEVES, P SCARR, JM SMITH, K SMITH, MG THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M COLLING, DJ DORNAN, PJ DUGEAY, S GREENE, AM HASSAED, JF LIESKE, NM NASH, J PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TOMALIN, IR WRIGHT, AG GIRTLER, P KNERINGER, E KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G JACKSON, D KEEMER, NR NUTTALL, M PATEL, A SLOAN, T SNOW, SW WHELAN, EP EFTHYMIOPOULOS, I KYRIAKIS, A SIMOPOULOU, E VAYAKI, A ZACHARIADOU, K BADIER, J BLONDEL, A BONNEAUD, G BRIENT, JC FOUQUE, G ORTEU, S ROUGE, A RUMPF, M TANAKA, R VERDERI, M VIDEAU, H ADLUNG, S ASSMANN, R BAUER, C BLUM, W BROWN, D CATTANEO, P DEHNING, B DIETL, H DYDAK, F FRANK, M HALLEY, AW LAUBER, J LUTJENS, G LUTZ, G MANNER, W RICHTER, R ROTSCHEIDT, H SCHRODER, J SCHWARZ, AS SETTLES, R SEYWERD, H STIERLIN, U STIEGLER, U STDENIS, R WOLF, G BOUCROT, J CALLOT, O CORDIER, A DAVIER, M DUFLOT, L GRIVAZ, JF HEUSSE, P JAFFE, DE JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM SCHUNE, MH VEILLET, JJ VIDEAU, I ZHANG, Z ABBANEO, D BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BOZZI, C CALDERINI, G CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GIASSI, A GIORGI, MA GREGORIO, A LIGABUE, F MANNELLI, EB MARROCCHESI, PS MESSINEO, A PALLA, F RIZZO, G SANGUINETTI, G SPAGNOLO, P STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J BETTERIDGE, AP CARTER, JM GREEN, MG MARCH, PV MIR, LM MEDCALF, T QUAZI, IS STRONG, JA WEST, LR BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC KLEINKNECHT, K RAAB, J RENK, B SANDER, HG SCHMIDT, H STEEG, F WALTHER, SM WANKE, R WOLF, B AUBERT, JJ BENCHEIKH, AM BENCHOUK, C BONISSENT, A CARR, J COYLE, P DRINKARD, J ETIENNE, F NICOD, D PAPALEXIOU, S PAYRE, P ROOS, L ROUSSEAU, D SCHWEMLING, P TALBY, M BLOCHDEVAUX, B COLAS, P DUARTE, H KOZANECKI, W LANCON, E LEMAIRE, MC LOCCI, E PEREZ, P PERRIER, F RANDER, J RENARDY, JF ROSOWSKY, A ROUSSARIE, A SCHULLER, JP SCHWINDLING, J MOHAND, DS VALLAGE, B JOHNSON, RP LITKE, AM TAYLOR, G WEAR, J ASHMAN, JG BABBAGE, W BOOTH, CN BUTTAR, C CARNEY, RE CARTWRIGHT, S COMBLEY, F HATFIELD, F THOMPSON, LF BARBERIO, E BOHRER, A BRANDT, S COWAN, G GRUPEN, C LUTTERS, G RIVERA, F SCHAFER, U DELLAMARINA, R GIANNINI, G GOBBO, B RAGUSA, F BELLANTONI, L CHEN, W CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JARED, RC LECLAIRE, BW LISHKA, C PAN, YB PATER, JR SAADI, Y SCHMITT, M SHARMA, V SHI, ZH WALSH, AM WEBER, FV WU, SL WU, X ZHENG, M ZOBERNIG, G TI MEASUREMENT OF THE TAU-POLARIZATION AT THE Z-RESONANCE SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID DECAYS; POLARIZATION; LEPTONS; LEP AB Using 18.8 pb-1 of data collected in 1990 and 1991, ALEPH has measured the tau polarisation in the decay modes tau-->enunuBAR, tau-->mununuBAR, tau-->rhonu tau-->a1nu, using both the individual tau decay kinematics and the event acollinearity. The measurement of the tau polarisation as a function of the production polar angle yields the two parameters A(tau) and A(e), where A(l) = 2g(V)l g(A)l/[(g(V)l)2 + (g(A)l)2]. The results A(tau) = 0.143 +/- 0.023 and A(e) = 0. 120 +/- 0.026 are consistent with the hypothesis of electron-tau universality. Assuming universality yields a measurement of the effective weak mixing angle sin 2theta(W)eff = 0.2332 +/- 0.0022. C1 UNIV AUTONOMA BARCELONA, INST FIS ALTES ENERGIES, E-08193 BARCELONA, SPAIN. UNIV BARI, INFN, SEZ, I-70126 BARI, ITALY. UNIV BARI, DIPARTIMENTO FIS, BARI, I-70126 BARI, ITALY. CHINESE ACAD SCI, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. UNIV CLERMONT FERRAND, PHYS CORPUSCULAIRE LAB, CNRS, F-63177 CLERMONT FERRAND, FRANCE. NIELS BOHR INST, DK-2100 COPENHAGEN, DENMARK. UNIV EDINBURGH, DEPT PHYS, EDINBURGH EH9 3JZ, MIDLOTHIAN, SCOTLAND. UNIV FLORENCE, INFN, DIPARTIMENTO FIS, SEZ FIRENZE, I-50125 FLORENCE, ITALY. FLORIDA STATE UNIV, DEPT PHYS, TALLAHASSEE, FL 32306 USA. FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA. INFN, LAB NAZL, I-00044 FRASCATI, ITALY. UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, SCOTLAND. UNIV HEIDELBERG, INST HOCHENERGIEPHYS, W-6900 HEIDELBERG, GERMANY. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, DEPT PHYS, LONDON SW7 2BZ, ENGLAND. UNIV INNSBRUCK, INST EXPTL PHYS, A-6020 INNSBRUCK, AUSTRIA. UNIV LANCASTER, DEPT PHYS, LANCASTER LA1 4YB, ENGLAND. DEMOCRITOS NUCL RES CTR, ATHENS, GREECE. ECOLE POLYTECH, PHYS NUCL & HAUTES ENERGIES LAB, CNRS, F-91128 PALAISEAU, FRANCE. MAX PLANCK INST PHYS & ASTROPHYS, WERNER HEISENBERG INST, W-8000 MUNICH, GERMANY. UNIV PARIS 11, ACCELERATEUR LINEAIRE LAB, CNRS, F-91405 ORSAY, FRANCE. UNIV PISA, INFN, DIPARTIMENTO FIS, SEZ PISA, I-56010 PISA, ITALY. SCUOLA NORMALE SUPER PISA, I-56010 PISA, ITALY. UNIV LONDON, ROYAL HOLLOWAY & BEDFORD NEW COLL, DEPT PHYS, SURREY TW20 OEX, ENGLAND. UNIV TURIN, IST FIS GEN, I-10124 TURIN, ITALY. RUTHERFORD APPLETON LAB, DEPT PARTICLE PHYS, DIDCOT OX11 0QX, OXON, ENGLAND. CNR, IST COSMO GEOFIS, TORINI, ITALY. LBL, BERKELEY, CA 94720 USA. CERN, DIV PPE, CH-1211 GENEVA 23, SWITZERLAND. UNIV MAINZ, INST PHYS, W-6500 MAINZ, GERMANY. FAC SCI LUMINY, CTR PHYS PARTICULES, CNRS, F-13288 MARSEILLE, FRANCE. CENS, DAPNIA, SERV PHYS PARTICULES, F-91191 GIF SUR YVETTE, FRANCE. UNIV CALIF SANTA CRUZ, INST PARTICLE PHYS, SANTA CRUZ, CA 95064 USA. UNIV SHEFFIELD, DEPT PHYS, SHEFFIELD S3 7RH, S YORKSHIRE, ENGLAND. UNIV SIEGEN, FACHBEREICH PHYS, W-5900 SIEGEN, GERMANY. UNIV TRIESTE, INFN, SEZ TRIESTE, I-34127 TRIESTE, ITALY. UNIV TRIESTE, DIPARTIMENTO FIS, I-34127 TRIESTE, ITALY. UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA. UNIV WASHINGTON, SEATTLE, WA 98195 USA. UNIV NAPLES, DIPARTIMENTO SCI FIS, I-80138 NAPLES, ITALY. RP BUSKULIC, D (reprint author), LAB PHYS PARTICULES, CNRS, IN2P3, F-74019 ANNECY LE VIEUX, FRANCE. RI Delfino, Manuel/A-1545-2012; ANTONELLI, ANTONELLA/C-6238-2011; Buttar, Craig/D-3706-2011; Stahl, Achim/E-8846-2011; Passalacqua, Luca/F-5127-2011; St.Denis, Richard/C-8997-2012; Forti, Francesco/H-3035-2011; Focardi, Ettore/E-7376-2012; Gregorio, Anna/J-1632-2012; Venturi, Andrea/J-1877-2012; Perrier, Frederic/A-5953-2011; Rolandi, Luigi (Gigi)/E-8563-2013; Colas, Paul/F-2876-2013; Bosman, Martine/J-9917-2014; Mir, Lluisa-Maria/G-7212-2015; ciocci, maria agnese /I-2153-2015; Hansen, John/B-9058-2015; Lusiani, Alberto/N-2976-2015; Marrocchesi, Pier Simone/N-9068-2015; Lusiani, Alberto/A-3329-2016; Murtas, Fabrizio/B-5729-2012; Booth, Christopher/B-5263-2016; Pacheco Pages, Andres/C-5353-2011; Assmann, Ralph/L-8457-2016; Ferrante, Isidoro/F-1017-2012 OI Delfino, Manuel/0000-0002-9468-4751; Stahl, Achim/0000-0002-8369-7506; Forti, Francesco/0000-0001-6535-7965; Focardi, Ettore/0000-0002-3763-5267; Rolandi, Luigi (Gigi)/0000-0002-0635-274X; Miquel, Ramon/0000-0002-6610-4836; Bosman, Martine/0000-0002-7290-643X; Mir, Lluisa-Maria/0000-0002-4276-715X; ciocci, maria agnese /0000-0003-0002-5462; Hansen, John/0000-0002-8422-5543; Lusiani, Alberto/0000-0002-6876-3288; Marrocchesi, Pier Simone/0000-0003-1966-140X; Lusiani, Alberto/0000-0002-6876-3288; Booth, Christopher/0000-0002-6051-2847; Pacheco Pages, Andres/0000-0001-8210-1734; Ferrante, Isidoro/0000-0002-0083-7228 NR 23 TC 32 Z9 32 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD AUG PY 1993 VL 59 IS 3 BP 369 EP 386 PG 18 WC Physics, Particles & Fields SC Physics GA LU298 UT WOS:A1993LU29800002 ER PT J AU GANN, SL BALTISBERGER, JH PINES, A AF GANN, SL BALTISBERGER, JH PINES, A TI DYNAMIC-ANGLE SPINNING WITHOUT SIDE-BAND SO CHEMICAL PHYSICS LETTERS LA English DT Article ID SOLID-STATE NMR; RESOLUTION AB By means of rotor-synchronized pi-pulses, it is possible to eliminate the spinning sidebands (while retaining their full intensity in the isotropic centerband) that usually arise in dynamic-angle spinning (DAS) NMR. The theory of this approach, dynamic-angle hopping (DAH-180), is described and illustrated with experimental results on quadrupolar nuclei. A magic-angle hopping (MAH-180) version of magic-angle spinning is also possible and can be used in a two-dimensional NMR experiment to produce sideband-free isotropic-anisotropic correlation spectra for spin-1/2 nuclei. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP GANN, SL (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 16 TC 21 Z9 21 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD JUL 30 PY 1993 VL 210 IS 4-6 BP 405 EP 410 DI 10.1016/0009-2614(93)87045-5 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LP038 UT WOS:A1993LP03800018 ER PT J AU SHKROB, IA AF SHKROB, IA TI A VIOLATION OF THE MAGNETIC EQUIVALENCE OF NUCLEI IN CHEMICALLY-INDUCED DYNAMIC NUCLEAR-POLARIZATION SPECTROSCOPY SO CHEMICAL PHYSICS LETTERS LA English DT Article ID DEOXYBENZOINS; PHOTOLYSIS; CIDNP AB It has been shown that a correlation between the hyperfine coupling constant and the ability of a given nucleus to be abstracted in the radical reaction could cause a violation of the equality in CIDNP signals from protons constituting a group of magnetically equivalent nuclei in the radical undergoing the abstraction. The scale of the effect is analyzed and optimal conditions for its detection are found. RP SHKROB, IA (reprint author), ARGONNE NATL LAB,DIV CHEM,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD JUL 30 PY 1993 VL 210 IS 4-6 BP 432 EP 436 DI 10.1016/0009-2614(93)87049-9 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LP038 UT WOS:A1993LP03800022 ER PT J AU GRAY, LJ SANSOUCIE, C AF GRAY, LJ SANSOUCIE, C TI A HERMITE INTERPOLATION ALGORITHM FOR HYPERSINGULAR BOUNDARY INTEGRALS SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING LA English DT Article ID ELEMENT METHOD; CRACK PROBLEMS; EQUATIONS AB This paper presents a conforming C1 boundary integral algorithm based on Hermite interpolation. This work is motivated by the requirement that the surface function multiplying a hypersingular kernel be differentiable at the collocation nodes. The unknown surface derivatives utilized by the Hermite approximation are determined, consistent with other boundary values, by writing a tangential hypersingular equation. Hypersingular equations are primarily invoked for solving crack problems, and the focus herein is on developing a suitable approximation for this geometry. Test calculations for the Laplace equation in two dimensions indicate that the algorithm is a promising technique for three-dimensional problems. C1 IBM CORP,BERGEN SCI CTR,N-5008 BERGEN,NORWAY. RICE UNIV,DEPT MATH,HOUSTON,TX 77251. RP GRAY, LJ (reprint author), OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,OAK RIDGE,TN 37831, USA. RI Woodward, Carol/M-4008-2014 NR 25 TC 36 Z9 36 U1 0 U2 5 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 JUL 30 PY 1993 VL 36 IS 14 BP 2357 EP 2367 DI 10.1002/nme.1620361404 PG 11 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA LN514 UT WOS:A1993LN51400003 ER PT J AU CHARYCH, DH NAGY, JO SPEVAK, W BEDNARSKI, MD AF CHARYCH, DH NAGY, JO SPEVAK, W BEDNARSKI, MD TI DIRECT COLORIMETRIC DETECTION OF A RECEPTOR-LIGAND INTERACTION BY A POLYMERIZED BILAYER ASSEMBLY SO SCIENCE LA English DT Article ID LANGMUIR-BLODGETT-FILMS; GAS-WATER INTERFACE; POLYDIACETYLENE FILMS; COLOR TRANSITIONS; PHASE-TRANSITIONS; ACID MONOLAYERS; GLUCOSE SENSOR; DIACETYLENE AB Detection of receptor-ligand interactions is generally accomplished by indirect assays such as enzyme-linked immunosorbent assay. A direct colorimetric detection method based on a polydiacetylene bilayer assembled on glass microscope slides has been developed. The bilayer is composed of a self-assembled monolayer of octadecylsilane and a Langmuir-Blodgett monolayer of polydiacetylene. The polydiacetylene layer is functionalized with an analog of sialic acid, the receptor-specific ligand for the influenza virus hemagglutinin. The sialic acid ligand serves as a molecular recognition element and the conjugated polymer backbone signals binding at the surface by a chromatic transition. The color transition is readily visible to the naked eye as a blue to red color change and can be quantified by visible absorption spectroscopy. Direct colorimetric detection by polydiacetylene films offers new possibilities for diagnostic applications and screening for new drug candidates or binding ligands. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP CHARYCH, DH (reprint author), LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720, USA. NR 30 TC 567 Z9 575 U1 13 U2 114 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUL 30 PY 1993 VL 261 IS 5121 BP 585 EP 588 DI 10.1126/science.8342021 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LP728 UT WOS:A1993LP72800031 PM 8342021 ER PT J AU SINGER, PT SMALAS, A CARTY, RP MANGEL, WF SWEET, RM AF SINGER, PT SMALAS, A CARTY, RP MANGEL, WF SWEET, RM TI LOCATING THE CATALYTIC WATER MOLECULE IN SERINE PROTEASES - RESPONSE SO SCIENCE LA English DT Article ID GAMMA-CHYMOTRYPSIN; INTERMEDIATE; COMPLEX; CRYSTAL C1 UNIV TROMSO,INST MATH & PHYS SCI,N-9000 TROMSO,NORWAY. SUNY HLTH SCI CTR,DEPT BIOCHEM,BROOKLYN,NY 11203. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RP SINGER, PT (reprint author), ARGONNE NATL LAB,DEPT BIOL,ARGONNE,IL 60439, USA. RI Smalas, Arne/C-4131-2016 OI Smalas, Arne/0000-0002-4651-9911 NR 12 TC 11 Z9 11 U1 0 U2 2 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUL 30 PY 1993 VL 261 IS 5121 BP 621 EP 622 DI 10.1126/science.261.5121.621 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LP728 UT WOS:A1993LP72800044 PM 17758171 ER PT J AU SMITH, EL PORTER, MD AF SMITH, EL PORTER, MD TI STRUCTURE OF MONOLAYERS OF SHORT-CHAIN N-ALKANOIC ACIDS (CH3(CH2)NCOOH, N = 0-9) SPONTANEOUSLY ADSORBED FROM THE GAS-PHASE AT SILVER AS PROBED BY INFRARED REFLECTION SPECTROSCOPY SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ORGANIZED MOLECULAR ASSEMBLIES; OXIDIZED ALUMINUM SURFACE; GOLD SURFACES; ALKYL CHAIN; ADSORPTION; ELECTRODES; CHEMISTRY; COADSORPTION; DISULFIDES; SPECTRA AB This paper presents the results of an infrared spectroscopic and wettability examination of monolayers formed by the spontaneous adsorption of short chain n-alkanoic acids (CH3(CH2)nCOOH, n = 0-9) from the gas phase onto Ag. The infrared spectral data, collected in an external reflection mode, indicate that the monolayers chemisorb as the corresponding salt and that the chains contain all-trans conformational sequences for n = 1-9. The chemisorption process is further exemplified by the formation of a carboxylate group that is symmetrically bound at Ag as either a bidentate or bridging ligand. The conformational insights are developed on the basis of an unusually prominent series of the methylene wagging progression. An in-depth analysis resulted in the complete assignment of the fundamental modes in the progression as well as a reassignment of the CC stretch in the region of this progression. Structural insights developed from the infrared spectral data and contact angle measurements are compared to analogous monolayers formed from dilute solution. This comparison points to the subtle, but important, role of solvent in influencing the structure of the monolayer. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 45 TC 86 Z9 86 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 JUL 29 PY 1993 VL 97 IS 30 BP 8032 EP 8038 DI 10.1021/j100132a037 PG 7 WC Chemistry, Physical SC Chemistry GA LW330 UT WOS:A1993LW33000037 ER PT J AU STANLEY, BJ GUIOCHON, G AF STANLEY, BJ GUIOCHON, G TI NUMERICAL ESTIMATION OF ADSORPTION ENERGY-DISTRIBUTIONS FROM ADSORPTION-ISOTHERM DATA WITH THE EXPECTATION-MAXIMIZATION METHOD SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID GAS SOLID CHROMATOGRAPHY; ALGORITHM; SURFACES AB The expectation-maximization (EM) method of parameter estimation is used to calculate adsorption energy distributions of molecular probes from their adsorption isotherms. EM does not require prior knowledge of the distribution function, or the isotherm, requires no smoothing of the isotherm data, and converges with high stability toward the maximum-likelihood estimate. The method is therefore robust and accurate at high iteration numbers. The EM algorithm is tested with simulated energy distributions corresponding to unimodal Gaussian, bimodal Gaussian, Poisson distributions, and the distributions resulting from Misra isotherms. Theoretical isotherms are generated from these distributions using the Langmuir model, and then chromatographic band profiles are computed using the ideal model of chromatography. Noise is then introduced in the theoretical band profiles comparable to those observed experimentally. The isotherm is then calculated using the elution-by-characteristic points method. The energy distribution given by the EM method is compared to the original one. The results are contrasted to those obtained with the House and Jaycock algorithm HILDA and shown to be superior in terms of both robustness, accuracy, and information theory. The effect of undersampling of the high-pressure/low-energy region of the adsorption is reported and discussed for the EM algorithm, as well as the effect of signal-to-noise ratio on the degree of heterogeneity that may be estimated experimentally. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,KNOXVILLE,TN 37996. NR 20 TC 77 Z9 77 U1 2 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 JUL 29 PY 1993 VL 97 IS 30 BP 8098 EP 8104 DI 10.1021/j100132a046 PG 7 WC Chemistry, Physical SC Chemistry GA LW330 UT WOS:A1993LW33000046 ER PT J AU KOURI, DJ ZHU, W MA, X PETTITT, BM HOFFMAN, DK AF KOURI, DJ ZHU, W MA, X PETTITT, BM HOFFMAN, DK TI MONTE-CARLO EVALUATION OF REAL-TIME FEYNMAN PATH-INTEGRALS FOR QUANTAL MANY-BODY DYNAMICS - DISTRIBUTED APPROXIMATING FUNCTIONS AND GAUSSIAN SAMPLING - REPLY SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP KOURI, DJ (reprint author), UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204, USA. NR 0 TC 0 Z9 0 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 JUL 29 PY 1993 VL 97 IS 30 BP 8107 EP 8107 DI 10.1021/j100132a048 PG 1 WC Chemistry, Physical SC Chemistry GA LW330 UT WOS:A1993LW33000048 ER PT J AU FRIAR, JL PAYNE, GL STOKS, VGJ DESWART, JJ AF FRIAR, JL PAYNE, GL STOKS, VGJ DESWART, JJ TI TRITON CALCULATIONS WITH THE NEW NIJMEGEN POTENTIALS SO PHYSICS LETTERS B LA English DT Article ID PHASE-SHIFT ANALYSIS; SCATTERING DATA; BINDING-ENERGY; GROUND-STATE; 3-NUCLEON; H-3 AB Triton properties are calculated using new nucleon-nucleon potentials, which were fit to the world nucleon-nucleon data. Three of these models have a nearly optimal chi2 per degree of freedom and can therefore be considered as alternative partial-wave analyses, which in quality can almost compete with the Nijmegen partial-wave analysis. The triton binding energy obtained with three local models (Nijm II, Reid93, AV18) can be summarized as 7.62 +/- 0.01 MeV, which is nearly 900 keV lower than experiment. The non-local model Nijm I binds by 7.72 MeV. C1 UNIV MAINZ,INST KERNPHYS,W-6500 MAINZ,GERMANY. UNIV IOWA,DEPT PHYS & ASTRON,IOWA CITY,IA 52242. CATHOLIC UNIV NIJMEGEN,INST THEORET PHYS,NIJMEGEN,NETHERLANDS. RP FRIAR, JL (reprint author), LOS ALAMOS NATL LAB,DIV THEORET PHYS,LOS ALAMOS,NM 87545, USA. NR 30 TC 112 Z9 112 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUL 29 PY 1993 VL 311 IS 1-4 BP 4 EP 8 DI 10.1016/0370-2693(93)90523-K PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LP929 UT WOS:A1993LP92900002 ER PT J AU AMSLER, C ARMSTRONG, D 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 KALINOWSKY, 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 WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C AF AMSLER, C ARMSTRONG, D 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 KALINOWSKY, 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 WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C TI ANTIPROTON-PROTON ANNIHILATION AT REST INTO OMEGA-PI-0-PI-0 SO PHYSICS LETTERS B LA English DT Article ID MESON; STATE; RESONANCE AB The annihilation channel ppBAR --> omegapi0pi0, where omega decays to pi0gamma, was studied with antiprotons stopped in liquid hydrogen. This reaction is dominated by the production of b1(0)(1235) with contributions from f2(1270) and the pipi S-wave. The branching ratio for ppBAR --> omegapi0pi0 is (2.00 +/- 0.21)% of all annihilations. The branching ratios for b1(0)(1235)pi0 (b1 --> omegapi0) and f2(1270)omega (f2 --> pi0pi0) are (0.92 +/- 0.11)% and (0.57 +/- 0.07)% of all annihilations, respectively. Upper limits for the production of vector mesons decaying to omegapi are given and the pipi mass distribution around 1 GeV is discussed. C1 RUHR UNIV BOCHUM,W-4630 BOCHUM,GERMANY. ACAD SCI BUDAPEST,H-1525 BUDAPEST,HUNGARY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV HAMBURG,W-2000 HAMBURG 13,GERMANY. UNIV KARLSRUHE,W-7500 KARLSRUHE,GERMANY. UNIV ZURICH,CH-8006 ZURICH,SWITZERLAND. UNIV MUNICH,W-8000 MUNICH 2,GERMANY. CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV MAINZ,W-6500 MAINZ,GERMANY. RP AMSLER, C (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Meyer, Curtis/L-3488-2014 OI Meyer, Curtis/0000-0001-7599-3973 NR 28 TC 37 Z9 37 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUL 29 PY 1993 VL 311 IS 1-4 BP 362 EP 370 DI 10.1016/0370-2693(93)90583-4 PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LP929 UT WOS:A1993LP92900062 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 KALINOWSKY, 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 KALINOWSKY, 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 RADIATIVE PROTONIUM ANNIHILATION INTO GAMMA-GAMMA, GAMMA-PI-0, GAMMA-ETA, GAMMA-OMEGA AND GAMMA-ETA' SO PHYSICS LETTERS B LA English DT Article ID REST; PI-0 AB Radiative ppBAR annihilation at rest into gammagamma, gammapi0, gammaeta, gammaomega and gammaeta' has been measured with the Crystal Barrel detector at LEAR for antiprotons stopped in liquid hydrogen. The branching ratios are B(gammapi0) = (44 +/- 4) x 10(-6), B(gammaeta) = (9.3 +/- 1.4) x 10(-6) and B(gammaomega) = (68 +/- 18) x 10(-6), respectively. For B(gammagamma) and B(gammaeta') we find new upper limits of 0.63 x 10(-6) and 12 x 10(-6) (95% CL), respectively. C1 ACAD SCI BUDAPEST,H-1525 BUDAPEST,HUNGARY. QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND. UNIV ZURICH,CH-8006 ZURICH,SWITZERLAND. UNIV MUNICH,W-8000 MUNICH 2,GERMANY. CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. RUHR UNIV BOCHUM,W-4630 BOCHUM,GERMANY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV HAMBURG,W-2000 HAMBURG 13,GERMANY. UNIV KARLSRUHE,W-7500 KARLSRUHE,GERMANY. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV MAINZ,W-6500 MAINZ,GERMANY. RP AMSLER, C (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Meyer, Curtis/L-3488-2014 OI Meyer, Curtis/0000-0001-7599-3973 NR 13 TC 23 Z9 23 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUL 29 PY 1993 VL 311 IS 1-4 BP 371 EP 378 DI 10.1016/0370-2693(93)90584-5 PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LP929 UT WOS:A1993LP92900063 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, I ALEKSAN, R ALEKSEEV, GD ALGERI, A ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DAVIES, J DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H DICIACCIO, L DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP ERSHAIDAT, N FASSOULIOTIS, D FEINDT, M FENYUK, A ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B GOLOVATYUK, VM GOMEZ, JJ CADENAS, Y GOPAL, G GORN, L GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E GROSSEWIESMANN, P GROSSETETE, B GUY, J HAEDINGER, U HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HUET, K HULTH, PO HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUENERMARQUIS, U KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D LINDGREN, J LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARON, T MARTI, S MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MYATT, G NAVARRIA, FL NEGRI, P NICOLAIDOU, R NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PIERRE, F PIMENTA, M PINGOT, O 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 REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TOME, B TORASSA, E TORTORA, L TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J AF ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, I ALEKSAN, R ALEKSEEV, GD ALGERI, A ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DAVIES, J DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H DICIACCIO, L DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP ERSHAIDAT, N FASSOULIOTIS, D FEINDT, M FENYUK, A ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B GOLOVATYUK, VM GOMEZ, JJ CADENAS, Y GOPAL, G GORN, L GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E GROSSEWIESMANN, P GROSSETETE, B GUY, J HAEDINGER, U HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HUET, K HULTH, PO HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUENERMARQUIS, U KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D LINDGREN, J LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARON, T MARTI, S MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MYATT, G NAVARRIA, FL NEGRI, P NICOLAIDOU, R NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PIERRE, F PIMENTA, M PINGOT, O 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 REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TOME, B TORASSA, E TORTORA, L TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J TI MEASUREMENT OF LAMBDA-B PRODUCTION AND LIFETIME IN Z0 HADRONIC DECAYS SO PHYSICS LETTERS B LA English DT Article ID BARYON PRODUCTION AB Evidence for the production of b-flavoured baryons in Z0 decays is reported from the analysis of 365 000 hadronic events collected by the DELPHI detector. Assuming that most of the weakly decaying b flavoured baryons produced by the Z0 are LAMBDA(b), the observed signal of (LAMBDAl- + LAMBDAl+BAR) pairs, where l is a high transverse momentum lepton in the same jet as the LAMBDA, leads to a production rate: f (b --> LAMBDA(b)) x Br(LAMBDA(b) --> LAMBDAlnuX) = (0.41 +/- 0.13 +/- 0.09)%. Using a sample of 18 reconstructed LAMBDA(b) decay vertices, the lifetime is determined to be tau(LAMBDA(b)) = ( 1.04(-0.38)+0.48 +/- 0.10) ps. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. ULB VUB,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. INFN,I-40126 BOLOGNA,ITALY. COLL FRANCE,PHYS CORPUSCULAIRE LAB,CNRS,IN2P3,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. ULP,CNRS,IN2P3,CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. FZU,INST PHYS,CAS,DIV HIGH ENERGY PHYS,CS-18040 PRAGUE 8,CZECH REPUBLIC. UNIV GENOA,DIPARTIMENTO FIS,I-16126 GENOA,ITALY. INFN,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,INST SCI NUCL,CNRS,IN2P3,F-38026 GRENOBLE,FRANCE. SEFT,HIGH ENERGY PHYS RES INST,SF-00170 HELSINKI,FINLAND. JOINT INST NUCL RES,MOSCOW 10100,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE 1,GERMANY. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. UNIV PARIS 11,ACCELERATEUR LINEAR LAB,CNRS,IN2P3,F-91405 ORSAY,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. IOWA STATE UNIV,AMES LAB,AMES,IA 50011. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV PARIS 06,UNIV PARIS 07,LPNHE,CNRS,IN2P3,F-75252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV LYON 1,IPNL,CNRS,IN2P3,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE MADRID,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,CPP,CNRS,IN2P3,F-13288 MARSEILLE 09,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. INFN,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN,DENMARK. CHARLES UNIV,MFF,CTR NUCL,CS-18000 PRAGUE 8,CZECH REPUBLIC. NATL INST NUCL & 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. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. INFN,I-35131 PADUA,ITALY. PONTFICIA UNIV CATOLICA,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV ROMA TOR VERGATA,DEPT FIS,I-00173 ROME,ITALY. INFN,I-00173 ROME,ITALY. CTR ETUD SACLAY,DSM,PAPNIA,F-91191 GIF SUR YVETTE,FRANCE. UNIV SALERNO,DIPARTIMENTO FIS,I-84100 SALERNO,ITALY. IST SUPER SANITA,INFN,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN. PROTVINO HIGH ENERGY PHYS INST,PROTVINO,RUSSIA. UNIV LJUBLJANA,J STEFAN INST,61000 LJUBLJANA,SLOVENIA. UNIV LJUBLJANA,DEPT PHYS,61000 LJUBLJANA,SLOVENIA. UNIV STOCKHOLM,S-10691 STOCKHOLM,SWEDEN. UNIV TURIN,DIPARTIMENTO FIS,I-10126 TURIN,ITALY. INFN,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. INFN,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. CSIC,IFIC,E-46100 BURJASSOT,SPAIN. AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. RP ABREU, P (reprint author), FCUL,IST,LIP,AV ELIAS GARCIA 14,P-1000 LISBON,PORTUGAL. 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R MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M 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 NAVARRIA, FL NEGRI, P NICOLAIDOU, R NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PETROVYKH, L PIERRE, F PIMENTA, M PINGOT, O 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 REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TOME, B TORASSA, E TORTORA, L TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J AF ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R ALEKSEEV, GD ALGERI, A ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GI BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DAVIES, J DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD 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M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARON, T MARTI, S MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M 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 NAVARRIA, FL NEGRI, P NICOLAIDOU, R NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PETROVYKH, L PIERRE, F PIMENTA, M PINGOT, O 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 REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TOME, B TORASSA, E TORTORA, L TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J TI DETERMINATION OF ALPHA-S FROM THE SCALING VIOLATION IN THE FRAGMENTATION FUNCTIONS IN E+E- ANNIHILATION SO PHYSICS LETTERS B LA English DT Article ID HADRONIC-Z-DECAYS; JET PRODUCTION-RATES; LUND MONTE-CARLO; LEADING ORDER; QUANTUM CHROMODYNAMICS; PERTURBATIVE QCD; PARTON DENSITIES; RESONANCE; SCATTERING; PHYSICS AB A determination of the hadronic fragmentation functions of the Z0 boson is presented from a study of the inclusive hadron production with the DELPHI detector at LEP. These fragmentation functions were compared with the ones at lower energies, thus covering data in a large kinematic range: 196 less-than-or-equal-to Q2 less-than-or-equal-to 8312 GeV2 and x (= p(h)/E(beam)) > 0.08. A large scaling violation was observed, which was used to extract the strong coupling constant in second order QCD: alpha(s)(M(Z)) = 0.118 +/- 0.005. The corresponding QCD scale for five quark flavours is: LAMBDA(MS)(5)BAR = 230 +/- 60 MeV. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. ULB VUB,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. INFN,I-40126 BOLOGNA,ITALY. COLL FRANCE,PHYS CORPUSCULAIRE LAB,CNRS,IN2P3,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. ULP,CTR RECH NUCL,CNRS,IN2P3,F-67037 STRASBOURG,FRANCE. 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UNIV AIX MARSEILLE 2,CPP,CNRS,IN2P3,F-13288 MARSEILLE 09,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. INFN,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN,DENMARK. CHARLES UNIV,MFF,CTR NUCL,CS-18000 PRAGUE 8,CZECH REPUBLIC. NATL INST NUCL & 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. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. INFN,I-35131 PADUA,ITALY. PONTIFICIA UNIV CATOLICA,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. INFN,I-00173 ROME,ITALY. CTR ETUD SACLAY,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. UNIV SALERNO,DIPARTIMENTO FIS,I-84100 SALERNO,ITALY. IST SUPER SANITA,IST NAZL FIS NUCL,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN. PROTVINO HIGH ENERGY PHYS INST,PROTVINO,RUSSIA. UNIV LJUBLJANA,J STEFAN INST,61000 LJUBLJANA,SLOVENIA. UNIV LJUBLJANA,DEPT PHYS,61000 LJUBLJANA,SLOVENIA. UNIV STOCKHOLM,S-10691 STOCKHOLM,SWEDEN. UNIV TURIN,DIPARTIMENTO FIS,I-10126 TURIN,ITALY. INFN,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. INFN,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. CSIC,IFIC,E-46100 BURJASSOT,SPAIN. AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. RP ABREU, P (reprint author), FCUL,IST,LIP,AV ELIAS GARCIA 14,P-1000 LISBON,PORTUGAL. RI Andreazza, Attilio/E-5642-2011; de Groot, Nicolo/A-2675-2009; Verlato, Marco/J-4604-2012; Dracos, Marcos/K-2335-2012; Nomerotski, Andrei/A-5169-2010; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; 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; Botner, Olga/A-9110-2013; Hallgren, Allan/A-8963-2013; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Vaz, Pedro/K-2464-2013; Monge, Maria Roberta/G-9127-2012; Ridky, Jan/H-6184-2014; Zukanovich Funchal, Renata/C-5829-2013; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Pimenta, Mario/M-1741-2013; Gomez Cadenas, Juan Jose/L-2003-2014; Ragazzi, Stefano/D-2463-2009; Roditi, Itzhak/O-7448-2014; Zuniga, Juan/P-4385-2014; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Smirnova, Oxana/A-4401-2013; Lozano-Bahilo, Julio/F-4881-2016; Olshevskiy, Alexander/I-1580-2016; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; OI Andreazza, Attilio/0000-0001-5161-5759; Verlato, Marco/0000-0003-1967-7655; Dracos, Marcos/0000-0003-0514-193X; Ruiz, Alberto/0000-0002-3639-0368; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; Vaz, Pedro/0000-0002-7186-2359; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Zukanovich Funchal, Renata/0000-0001-6749-0022; Tome, Bernardo/0000-0002-7564-8392; Pimenta, Mario/0000-0002-2590-0908; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Ragazzi, Stefano/0000-0001-8219-2074; Roditi, Itzhak/0000-0003-2363-5626; Zuniga, Juan/0000-0002-1041-6451; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Smirnova, Oxana/0000-0003-2517-531X; Lozano-Bahilo, Julio/0000-0003-0613-140X; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Matteuzzi, Clara/0000-0002-4047-4521; DE MIN, ALBERTO/0000-0002-8130-9389; Demaria, Natale/0000-0003-0743-9465; Bonesini, Maurizio/0000-0001-5119-1896; Sannino, Mario/0000-0001-7700-8383; Maio, Amelia/0000-0001-9099-0009; De Angelis, Alessandro/0000-0002-3288-2517; De Lotto, Barbara/0000-0003-3624-4480 NR 60 TC 53 Z9 53 U1 0 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUL 29 PY 1993 VL 311 IS 1-4 BP 408 EP 424 DI 10.1016/0370-2693(93)90587-8 PG 17 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LP929 UT WOS:A1993LP92900066 ER PT J AU LI, DQ SWANSON, BI ROBINSON, JM HOFFBAUER, MA AF LI, DQ SWANSON, BI ROBINSON, JM HOFFBAUER, MA TI PORPHYRIN BASED SELF-ASSEMBLED MONOLAYER THIN-FILMS - SYNTHESIS AND CHARACTERIZATION SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID LANGMUIR-BLODGETT-FILMS; ORGANIZED MOLECULAR ASSEMBLIES; ATOMIC FORCE MICROSCOPY; NORMAL COORDINATE ANALYSIS; X-RAY-DIFFRACTION; 2ND-HARMONIC GENERATION; GOLD SURFACES; STRUCTURAL CHARACTERIZATION; INFRARED-SPECTROSCOPY; HARMONIC-GENERATION AB The synthesis and characterization of covalently bound self-assembled monolayer thin films of 5,10,15,20-tetra(4-pyridyl)-21H,23H-porphine (TPyP) and its derivatives on fused quartz and silicon [100] substrates having a native oxide layer are described. The monolayer film consists of porphyrin macrocycle disk-like structures that were analyzed by UV-visible spectroscopy, X-ray photoelectron spectroscopy (XPS), and polarized FTIR-ATR measurements. One of the attractive features of these complexes is their large second-order nonlinear optical response, as expected for a strongly delocalized pi-electron system without inversion symmetry. Second-harmonic generation (SHG) measurements have been used to determine the absolute value of the dominant element of the nonlinear susceptibility, chi(zzz) approximately 2 x 10(-8) esu, the uniformity of these films, and the dispersion of the refractive indices. The average molecular orientation angle of the surface-bound chromophores was measured by both FTIR-ATR and SHG and found to be in good agreement. C1 LOS ALAMOS NATL LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545. RP LI, DQ (reprint author), LOS ALAMOS NATL LAB,DIV ISOTOPE & NUCL CHEM,LOS ALAMOS,NM 87545, USA. NR 63 TC 172 Z9 176 U1 5 U2 56 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUL 28 PY 1993 VL 115 IS 15 BP 6975 EP 6980 DI 10.1021/ja00068a068 PG 6 WC Chemistry, Multidisciplinary SC Chemistry GA LT673 UT WOS:A1993LT67300068 ER PT J AU HOFSTADLER, SA WAHL, JH BRUCE, JE SMITH, RD AF HOFSTADLER, SA WAHL, JH BRUCE, JE SMITH, RD TI ONLINE CAPILLARY ELECTROPHORESIS WITH FOURIER-TRANSFORM ION-CYCLOTRON RESONANCE MASS-SPECTROMETRY SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID ELECTROSPRAY IONIZATION; ZONE ELECTROPHORESIS; LARGE MOLECULES; POLYPEPTIDES; PROTEINS C1 PACIFIC NW LAB, DEPT CHEM SCI, RICHLAND, WA 99352 USA. PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 26 TC 67 Z9 67 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUL 28 PY 1993 VL 115 IS 15 BP 6983 EP 6984 DI 10.1021/ja00068a070 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA LT673 UT WOS:A1993LT67300070 ER PT J AU SMITH, MR MATSUNAGA, PT ANDERSEN, RA AF SMITH, MR MATSUNAGA, PT ANDERSEN, RA TI PREPARATION OF MONOMERIC (ME5C5)2VO AND (ME5C5)2TI(O)(L) AND THEIR DECOMPOSITION TO (ME5C5)4M4(MU-O)6 SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID ELECTRON-PARAMAGNETIC RESONANCE; OXYGEN-ATOM TRANSFER; NITROUS-OXIDE; STRUCTURAL CHARACTERIZATION; TRAPPING REACTIONS; MOLECULAR-STRUCTURE; CRYSTAL-STRUCTURE; DATIVE LIGANDS; COMPLEXES; OXO C1 LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RI Smith, Milton/M-3511-2016 OI Smith, Milton/0000-0002-8036-4503 NR 37 TC 111 Z9 111 U1 1 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUL 28 PY 1993 VL 115 IS 15 BP 7049 EP 7050 DI 10.1021/ja00068a103 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA LT673 UT WOS:A1993LT67300103 ER PT J AU SAVIKHIN, S WELLS, T SONG, PS STRUVE, WS AF SAVIKHIN, S WELLS, T SONG, PS STRUVE, WS TI ULTRAFAST PUMP-PROBE SPECTROSCOPY OF NATIVE ETIOLATED OAT PHYTOCHROME SO BIOCHEMISTRY LA English DT Article ID PRIMARY PHOTOPROCESSES; FLUORESCENCE; KINETICS; PR->PFR; AVENA AB Absorption difference profiles were obtained at wavelengths from 640 to 700 nm with 1-2-ps resolution in a study of primary photoprocesses in the Pr --> Pfr transformation in native oat phytochrome. These experiments were performed using low-intensity laser pulses at high repetition rate; fast sample recycling ensured that essentially all phytochrome species were excited from the Pr ground state. The Pr*-stimulated emission decay at wavelengths >670 nm exhibits major components with lifetimes of approximately 16 and 50-60 ps. Formation of the asymptotic 695-nm lumi-R absorption spectrum rapidly follows stimulated emission decay. Photoexcitation of one or both of the lumi-R intermediates instantaneously recreates fluorescing Pr* phytochrome, which is spectroscopically and kinetically indistinguishable from that generated by direct illumination of ground-state Pr. This is consistent with assignment of lumi-R as a species in which the chromophore has isomerized from the Z,Z,Z to the Z,Z,E conformation. Anisotropy studies indicate that the orientations of the Pr and lumi-R absorption transition moments are nearly parallel, since little anisotropy decay occurs during the 500-ps time window of these experiments. C1 UNIV NEBRASKA,DEPT CHEM,LINCOLN,NE 68588. UNIV NEBRASKA,INST CELLULAR & MOLEC BIOL,LINCOLN,NE 68588. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. FU NIGMS NIH HHS [GM36956] NR 23 TC 29 Z9 30 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD JUL 27 PY 1993 VL 32 IS 29 BP 7512 EP 7518 DI 10.1021/bi00080a024 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA LP643 UT WOS:A1993LP64300024 PM 8338849 ER PT J AU CAMP, JB SCHWARZ, RB AF CAMP, JB SCHWARZ, RB TI USE OF FULLERENE FILMS AS SURFACES OF UNIFORM ELECTRIC-POTENTIAL SO APPLIED PHYSICS LETTERS LA English DT Article ID MICROSCOPY; C60/C70 AB Continuous fullerene films (85% C60, 15% C70) Of thickness approximately 10 nm have been sublimed on a metallic substrate previously coated with a 1-nm-thick Ge sublayer. The films show no surface potential variations when scanned with a Kelvin probe of 1 mV and 1 mm potential and spatial resolutions. Transmission electron microscopy reveals the fullerene films to be amorphous. C1 LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP CAMP, JB (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. NR 15 TC 3 Z9 3 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 26 PY 1993 VL 63 IS 4 BP 455 EP 457 DI 10.1063/1.110022 PG 3 WC Physics, Applied SC Physics GA LP330 UT WOS:A1993LP33000010 ER PT J AU BRAUN, W KWAK, BS ERBIL, A BUDAI, JD WILKENS, BJ AF BRAUN, W KWAK, BS ERBIL, A BUDAI, JD WILKENS, BJ TI EPITAXIAL LEAD-ZIRCONATE-TITANATE THIN-FILMS ON SAPPHIRE SO APPLIED PHYSICS LETTERS LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; ELECTRICAL-PROPERTIES AB Pb(Zr1-xTix) O3 thin films covering the whole compositional range x = 0 to x = 1 have been grown for the first time on the sapphire (1102BAR) plane using the metalorganic chemical vapor deposition technique. The films are three-dimensionally epitaxial and exhibit single crystal properties. The structural transitions, examined by x-ray diffraction, are shifted slightly from the bulk single crystal values. Ferroelectric P-E hysteresis curves and the dielectric constant of the films were investigated using interdigitated electrodes fabricated by photolithography. C1 GEORGIA INST TECHNOL,SCH PHYS,ATLANTA,GA 30332. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. BELL COMMUN RES INC,RED BANK,NJ 07701. RI Budai, John/R-9276-2016 OI Budai, John/0000-0002-7444-1306 NR 13 TC 33 Z9 33 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 26 PY 1993 VL 63 IS 4 BP 467 EP 469 DI 10.1063/1.110026 PG 3 WC Physics, Applied SC Physics GA LP330 UT WOS:A1993LP33000014 ER PT J AU VANLOY, MD YOUNG, AT LEUNG, KN AF VANLOY, MD YOUNG, AT LEUNG, KN TI MEASUREMENTS OF BARIUM PHOTOCATHODE QUANTUM YIELDS AT 4 EXCIMER-LASER WAVELENGTHS SO APPLIED PHYSICS LETTERS LA English DT Article ID ULTRAVIOLET-LASER; BRIGHTNESS; GENERATION AB The electron quantum yields from barium cathodes excited by excimer laser radiation at 193, 248, 308, and 351 nm have been determined. Experiments with different cathode surface preparation techniques reveal that deposition of barium film a few microns thick on a clean copper surface under moderate vacuum conditions achieves relatively high quantum efficiencies. Quantum yields measured from surfaces prepared in this manner are 2.3 X 10(-3) at 193 nm, 7.6 X 10(-4) at 248 nm, 6.1 X 10(-4) at 308 nm, and 4.0 X 10(-4) at 351 nm. Other preparation techniques, such as laser cleaning of a solid barium surface, produced quantum yields that were at least an order of magnitude lower than these values. RP VANLOY, MD (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 12 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 26 PY 1993 VL 63 IS 4 BP 476 EP 478 DI 10.1063/1.110029 PG 3 WC Physics, Applied SC Physics GA LP330 UT WOS:A1993LP33000017 ER PT J AU FULLERTON, EE CAO, W THOMAS, G SCHULLER, IK CAREY, MJ BERKOWITZ, AE AF FULLERTON, EE CAO, W THOMAS, G SCHULLER, IK CAREY, MJ BERKOWITZ, AE TI QUANTITATIVE CHARACTERIZATION OF EPITAXIAL SUPERLATTICES BY X-RAY-DIFFRACTION AND HIGH-RESOLUTION ELECTRON-MICROSCOPY SO APPLIED PHYSICS LETTERS LA English DT Article ID FILMS AB Quantitative x-ray diffraction (XRD) and high resolution electron microscopy (HREM) have been applied to the analysis of an epitaxial CoO/NiO superlattice. This example shows that the qualitative information determined directly from a XRD spectrum or HREM image is limited and can even be misleading. However, by a combination of quantitative intensity measurements and structural modeling, a detailed quantitative characterization of the superlattice structure is C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. UNIV CALIF BERKELEY,NATL CTR ELECTRON MICROSCOPY,BERKELEY,CA 94720. UNIV CALIF SAN DIEGO,DEPT PHYS 0319,LA JOLLA,CA 92093. UNIV CALIF SAN DIEGO,CTR MAGNET RECORDING RES 0401,LA JOLLA,CA 92093. RP FULLERTON, EE (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Fullerton, Eric/H-8445-2013 OI Fullerton, Eric/0000-0002-4725-9509 NR 15 TC 11 Z9 11 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 26 PY 1993 VL 63 IS 4 BP 482 EP 484 DI 10.1063/1.110030 PG 3 WC Physics, Applied SC Physics GA LP330 UT WOS:A1993LP33000019 ER PT J AU FRITZ, IJ BRENNAN, TM HAMMONS, BE HOWARD, AJ WOROBEY, W VAWTER, GA MYERS, DR AF FRITZ, IJ BRENNAN, TM HAMMONS, BE HOWARD, AJ WOROBEY, W VAWTER, GA MYERS, DR TI LOW-VOLTAGE VERTICAL-CAVITY TRANSMISSION MODULATOR FOR 1.06 MU-M SO APPLIED PHYSICS LETTERS LA English DT Article ID QUANTUM AB We present results on the first all-semiconductor, vertical Fabry-Perot-cavity optical transmission modulator. This device combined mechanically stable strained and unstrained (In,A1,Ga)As multilayers to achieve operation at 1.06 mum. Transmission-mode operation allows the resonant wavelength of the cavity to be finely tuned by varying the angle of incidence, providing, for the first time, a means of compensating for small inaccuracies in growth parameters. Using the modulator in double-pass operation with a corner-cube retroreflector, we demonstrate a tunable reflectance modulator with a fractional modulation of 25% at 3-V bias, suitable for applications in free-space communication. RP FRITZ, IJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 9 TC 8 Z9 8 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 26 PY 1993 VL 63 IS 4 BP 494 EP 496 DI 10.1063/1.109983 PG 3 WC Physics, Applied SC Physics GA LP330 UT WOS:A1993LP33000023 ER PT J AU MILLER, DJ HU, JG HETTINGER, JD GRAY, KE TKACZYK, JE DELUCA, J KARAS, PL SUTLIFF, JA GARBAUSKAS, MF AF MILLER, DJ HU, JG HETTINGER, JD GRAY, KE TKACZYK, JE DELUCA, J KARAS, PL SUTLIFF, JA GARBAUSKAS, MF TI BRICK-WALL STRUCTURE IN POLYCRYSTALLINE TLBA2CA2CU3OX THICK-FILMS WITH HIGH CRITICAL CURRENTS SO APPLIED PHYSICS LETTERS LA English DT Article ID CRITICAL CURRENT DENSITIES; MAGNETIC-FIELD; TRANSPORT; TAPES; TEMPERATURE; WIRES; SUPERCONDUCTORS; BOUNDARIES AB Microstructural studies of TlBa2Ca2Cu3Ox(TI-1223) thick films that exhibit high critical current densities (J(c)) for nonepitaxial polycrystalline materials show that these films possess a ''brick-wall'' structure that may be partly responsible for high current densities. The magnetic field dependence of J(c) is similar to that reported for Bi-Sr-Ca-Cu-0 materials that exhibit this structure. Structural analyses indicate a high degree of c-axis alignment but little in-plane texture, suggesting that high-angle [001] tilt boundaries are prevalent. Scanning and transmission electron microscopy reveal that the microstructure consists of overlapping layers reminiscent of the brick-wall structure. These results suggest that high critical current densities may be achieved by percolative transport through this structure. C1 ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439. GE CO,RES & DEV,SCHENECTADY,NY 12301. RP MILLER, DJ (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 17 TC 17 Z9 17 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 JUL 26 PY 1993 VL 63 IS 4 BP 556 EP 558 DI 10.1063/1.110003 PG 3 WC Physics, Applied SC Physics GA LP330 UT WOS:A1993LP33000044 ER PT J AU KROMANN, R KINGSTON, JJ MIKLICH, AH SAGDAHL, LT CLARKE, J AF KROMANN, R KINGSTON, JJ MIKLICH, AH SAGDAHL, LT CLARKE, J TI INTEGRATED HIGH-TRANSITION TEMPERATURE MAGNETOMETER WITH ONLY 2 SUPERCONDUCTING LAYERS SO APPLIED PHYSICS LETTERS LA English DT Article ID DC SQUIDS; FLUX TRANSFORMERS; NOISE; YBA2CU3O7-X; JUNCTIONS; FILMS AB We describe the fabrication and testing of an integrated YBa2Cu3O7-x thin-film magnetometer consisting of a dc superconducting quantum interference device (SQUID), with biepitaxial grain boundary junctions, integrated with a flux transformer on a single substrate. Only two superconducting layers are required, the SQUID body serving as the crossunder that completes the multiturn flux transformer. The highest temperature at which any of the magnetometers functioned was 76 K. At 60 K the magnetic field gain of this device was 63, and the magnetic field noise was 160 fT Hz-1/2 at 2 kHz, increasing to 3.4 pT Hz-1/2 at 1 Hz. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. NKT RES CTR,DK-2605 BONDBY,DENMARK. XEROX PARC,PALO ALTO,CA 94304. NORWEGIAN INST TECHNOL,DEPT PHYS,N-7034 TRONDHEIM,NORWAY. RP KROMANN, R (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 17 TC 22 Z9 22 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 26 PY 1993 VL 63 IS 4 BP 559 EP 561 DI 10.1063/1.110781 PG 3 WC Physics, Applied SC Physics GA LP330 UT WOS:A1993LP33000045 ER PT J AU ATWOOD, D EILAM, G SONI, A AF ATWOOD, D EILAM, G SONI, A TI TRANSVERSE TAU-POLARIZATION IN DECAYS OF THE TOP AND BOTTOM QUARKS IN THE WEINBERG MODEL OF CP NONCONSERVATION SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGGS SECTOR; VIOLATION; SUPERCOLLIDERS; PROBE AB We show that the transverse polarization asymmetry of the tau lepton in the decay t --> btau nu is extremely sensitive to CP violating phases arising from the charged Higgs boson exchange in the Weinberg model of CP nonconservation. Qualitatively, the polarization asymmetries are enhanced over rate or energy asymmetries by a factor of almost-equal-to m(t)/m(tau) approximately 100. Thus for optimal values of the parameters the method requires almost-equal-to 10(4) top pairs to be observable rather than 10(7) needed for rate or energy asymmetries. We also examine tau polarization in b decays via b --> cnutau and find that it can also be very effective in constraining the CP violation parameters of the extended Higgs sector. C1 TECHNION ISRAEL INST TECHNOL, DEPT PHYS, HAIFA, ISRAEL. BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. RP STANFORD LINEAR ACCELERATOR CTR, DEPT PHYS, BOX 4349, STANFORD, CA 94309 USA. NR 27 TC 38 Z9 38 U1 0 U2 0 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 JUL 26 PY 1993 VL 71 IS 4 BP 492 EP 495 DI 10.1103/PhysRevLett.71.492 PG 4 WC Physics, Multidisciplinary SC Physics GA LP045 UT WOS:A1993LP04500006 ER PT J AU ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AUSTERN, M AZZI, P BADEN, AR BACCHETTA, N BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A 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 DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKES, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, J MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PIACENTINO, G PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARKA, 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 AUSTERN, M AZZI, P BADEN, AR BACCHETTA, N BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A 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 DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKES, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, J MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PIACENTINO, G PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARKA, 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 BOTTOM-QUARK PRODUCTION CROSS-SECTION USING SEMILEPTONIC DECAY ELECTRONS IN P(P)OVER-BAR COLLISIONS AT ROOT-S = 1.8 TEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID PROTON-ANTIPROTON COLLISIONS; HEAVY FLAVOR PRODUCTION; HADRONIC COLLISIONS; BEAUTY PRODUCTION; QCD CORRECTIONS; B-MESONS; COLLIDER AB We present measurements of the bottom-quark production cross sections in ppBAR collisions at square-root s = 1.8 TeV. From the inclusive electron production rate, we have determined the bottom-quark production cross sections to be 1010 +/- 270, 168 +/- 43, 37 +/- 10 nb for the rapidity range of \y(b)\ < 1.0 and the transverse momentum ranges of p(T)b > 15, 23, 32 GeV/c, respectively. In addition, from the associated electron-D0 production rate, we have determined the bottom-quark cross section to be 364 +/- 80(stat) +/- 95(syst) nb for \y(b)\ < 1.0 and p(T)b > 19 GeV/c. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. 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. HARVARD UNIV,CAMBRIDGE,MA 02138. IST NAZL FIS NUCL,LAB NAZL FRASCATI,FRASCATI,ITALY. UNIV ILLINOIS,URBANA,IL 61801. MCGILL UNIV,INST PARTICLE PHYS,MONTREAL H3A 2T5,QUEBEC,CANADA. UNIV TORONTO,TORONTO M5S 1A1,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,IST NAZL FIS NUCL,SEZ PADOVA,I-35131 PADUA,ITALY. UNIV PENN,PHILADELPHIA,PA 19104. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14627. ROCKEFELLER UNIV,NEW YORK,NY 10021. RUTGERS UNIV,PISCATAWAY,NJ 08854. TEXAS A&M UNIV SYST,COLL STN,TX 77843. TUFTS UNIV,MEDFORD,MA 02155. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. UNIV WISCONSIN,MADISON,WI 53706. UNIV PITTSBURGH,PITTSBURGH,PA 15260. RP ABE, F (reprint author), NATL LAB HIGH ENERGY,PHYS,TSUKUBA,IBARAKI,JAPAN. 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 117 Z9 117 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 26 PY 1993 VL 71 IS 4 BP 500 EP 504 DI 10.1103/PhysRevLett.71.500 PG 5 WC Physics, Multidisciplinary SC Physics GA LP045 UT WOS:A1993LP04500008 ER PT J AU FENG, YP SINHA, SK DECKMAN, HW HASTINGS, JB SIDDONS, DP AF FENG, YP SINHA, SK DECKMAN, HW HASTINGS, JB SIDDONS, DP TI X-RAY FLUX ENHANCEMENT IN THIN-FILM WAVE-GUIDES USING RESONANT BEAM COUPLERS SO PHYSICAL REVIEW LETTERS LA English DT Article AB We present experimental evidence for achieving significant x-ray flux enhancement by coupling a highly collimated and monochromatic synchrotron x-ray beam into a Si/polyimide/SiO2 thin-film waveguide. The observed 20-fold flux increase agrees with theoretical predictions and was limited only by absorption of the 1 angstrom x rays in the waveguide structure. C1 BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP FENG, YP (reprint author), EXXON RES & ENGN CO,ANNANDALE,NJ 08801, USA. NR 8 TC 124 Z9 126 U1 2 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 26 PY 1993 VL 71 IS 4 BP 537 EP 540 DI 10.1103/PhysRevLett.71.537 PG 4 WC Physics, Multidisciplinary SC Physics GA LP045 UT WOS:A1993LP04500017 ER PT J AU BUDHANI, RC LIOU, SH CAI, ZX AF BUDHANI, RC LIOU, SH CAI, ZX TI DIMINISHING SIGN ANOMALY AND SCALING BEHAVIOR OF THE MIXED-STATE HALL RESISTIVITY IN TL2BA2CA2CU3O10 FILMS CONTAINING COLUMNAR DEFECTS SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; HIGH-TC SUPERCONDUCTORS; VORTEX MOTION; II SUPERCONDUCTORS; TRANSITION; YBA2CU3O7; REVERSAL; DISORDER; OXIDES; PHASE AB The issues of sign reversal of the Hall voltage and scaling between longitudinal (rho(xx)) and Hall (rho(xy)) resistivities are studied in Tl2Ba2Ca2Cu3O10 films in which the vortex dynamics is drastically changed by flux pinning at heavy-ion-irradiation-induced linear defects. While the sign anomaly diminishes with increasing defect concentration, the power law rho(xy) approximately rho(xx)beta, beta = 1.85 +/- 0.1, holds even after irradiation. This result shows that the scaling is a universal feature of the mixed state in this system. The sign anomaly, on the other hand, is not consistent with a model that invokes pinning-induced backflow in the vortex core as the mechanism for this effect. C1 UNIV NEBRASKA,DEPT PHYS,LINCOLN,NE 68588. RP BUDHANI, RC (reprint author), BROOKHAVEN NATL LAB,DIV MAT SCI,UPTON,NY 11973, USA. NR 32 TC 86 Z9 86 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 26 PY 1993 VL 71 IS 4 BP 621 EP 624 DI 10.1103/PhysRevLett.71.621 PG 4 WC Physics, Multidisciplinary SC Physics GA LP045 UT WOS:A1993LP04500038 ER PT J AU WEINBERG, AM AF WEINBERG, AM TI HOW DO WE IDENTIFY SCIENCES MOST WORTHWHILE PROBLEMS SO SCIENTIST LA English DT Editorial Material AB WORTHWHILE PROBLEMS: Physicist Alvin M. Weinberg, former director of the Oak Ridge National Laboratory, has been contemplating the prioritizing of big- and small-science projects for decades. In this excerpt from his recent essay collection, Nuclear Reactions: Science and Trans-Science, he explores in depth the notions surrounding identification of science's ''worthwhile problems''. RP WEINBERG, AM (reprint author), OAK RIDGE ASSOCIATED UNIV,OAK RIDGE,TN 37830, USA. NR 0 TC 1 Z9 1 U1 1 U2 3 PU SCIENTIST INC PI PHILADELPHIA PA 3600 MARKET ST SUITE 450, PHILADELPHIA, PA 19104 SN 0890-3670 J9 SCIENTIST JI Scientist PD JUL 26 PY 1993 VL 7 IS 15 BP 11 EP 11 PG 1 WC Information Science & Library Science; Multidisciplinary Sciences SC Information Science & Library Science; Science & Technology - Other Topics GA LN413 UT WOS:A1993LN41300005 ER PT J AU RAVIZZA, G ESSER, BK AF RAVIZZA, G ESSER, BK TI A POSSIBLE LINK BETWEEN THE SEAWATER OSMIUM ISOTOPE RECORD AND WEATHERING OF ANCIENT SEDIMENTARY ORGANIC-MATTER SO CHEMICAL GEOLOGY LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL SYMP ON THE GEOCHEMISTRY OF THE EARTH SURFACES CY AUG 01-06, 1993 CL PENN STATE UNIV, UNIVERSITY PARK, PA SP INT ASSOC GEOCHEM & COSMOCHEM, NATL SCI FDN, PENN STATE UNIV HO PENN STATE UNIV ID SEA C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB L396,LIVERMORE,CA 94550. RP RAVIZZA, G (reprint author), WOODS HOLE OCEANOG INST,DEPT GEOL & GEOPHYS,WOODS HOLE,MA 02543, USA. RI Esser, Bradley/G-4283-2010; Ravizza, Greg/J-5104-2013 OI Esser, Bradley/0000-0002-3219-4298; NR 11 TC 50 Z9 55 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2541 J9 CHEM GEOL JI Chem. Geol. PD JUL 25 PY 1993 VL 107 IS 3-4 BP 255 EP 258 DI 10.1016/0009-2541(93)90186-M PG 4 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA LQ548 UT WOS:A1993LQ54800014 ER PT J AU YOSHIDA, K STRATHMANN, MP MAYEDA, CA MARTIN, CH PALAZZOLO, MJ AF YOSHIDA, K STRATHMANN, MP MAYEDA, CA MARTIN, CH PALAZZOLO, MJ TI A SIMPLE AND EFFICIENT METHOD FOR CONSTRUCTING HIGH-RESOLUTION PHYSICAL MAPS SO NUCLEIC ACIDS RESEARCH LA English DT Article ID YEAST ARTIFICIAL CHROMOSOMES; REPETITIVE DNA-SEQUENCES; HUMAN GENOME; BITHORAX COMPLEX; WALKING; LIBRARIES; PCR; AMPLIFICATION; STRATEGY; PRIMER AB This paper describes a simple and efficient walking method for constructing high resolution physical maps and discusses its applications to genome analysis. The method is an integration of three strategies: (1) use of a highly redundant library of 3Kb-long subclones; (2) construction of a multidimensional pool from the library; (3) direct application of a PCR (polymerase chain reaction)-based screening technique to the pooled library, with two PCR primers, one from the end of the subcloning vector and the other from the leading edge of the walk. This technique allows not only detection of each overlapping subclone but simultaneous determination of its orientation and the size of its overlap. The end of the subclone with the smallest overlap is sequenced and a primer is designed for the next step in the walk. Iteration of the screening procedure with minimum overlapping subclones results in completion of the high resolution map. Using this method, a 3Kb-resolution map was constructed from an 80Kb region of the bithorax complex of Drosophila melanogaster. The method is general enough to be applicable to DNA from other species, and simple enough to be automated. C1 LAWRENCE BERKELEY LAB,CTR HUMAN GENOME,BERKELEY,CA 94720. FU NHGRI NIH HHS [GNM 1 R01 HG00837-01] NR 47 TC 10 Z9 10 U1 0 U2 0 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD JUL 25 PY 1993 VL 21 IS 15 BP 3553 EP 3562 DI 10.1093/nar/21.15.3553 PG 10 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA LQ083 UT WOS:A1993LQ08300030 PM 8393991 ER PT J AU HAUSER, LJ TREAT, ML OLINS, DE AF HAUSER, LJ TREAT, ML OLINS, DE TI CLONING AND ANALYSIS OF THE MACRONUCLEAR GENE FOR HISTONE-H1 FROM EUPLOTES-EURYSTOMUS SO NUCLEIC ACIDS RESEARCH LA English DT Note ID MOTIFS; PROTEIN; DNA RP HAUSER, LJ (reprint author), UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,DIV BIOL,OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. RI Hauser, Loren/H-3881-2012 NR 9 TC 8 Z9 9 U1 0 U2 0 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD JUL 25 PY 1993 VL 21 IS 15 BP 3586 EP 3586 DI 10.1093/nar/21.15.3586 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA LQ083 UT WOS:A1993LQ08300044 PM 8346042 ER PT J AU SILLER, L WENDELKEN, JF HOCK, KM PALMER, RE AF SILLER, L WENDELKEN, JF HOCK, KM PALMER, RE TI RESONANCE ELECTRON-SCATTERING BY PHYSISORBED AND CHEMISORBED O-2 ON PT(111) SO CHEMICAL PHYSICS LETTERS LA English DT Article ID ABSORPTION FINE-STRUCTURE; ENERGY LOSS SPECTROSCOPY; BOND LENGTHS; NEAR-EDGE; SHAPE RESONANCES; MOLECULAR-OXYGEN; GAS-PHASE; SURFACE; CO; N-2 AB We have investigated resonance electron scattering by both physisorbed and chemisorbed molecular O2 on Pt(111). In each case, the molecular sigma*-shape resonance is manifest in the vibrational excitation cross section but the resonance energy is lowered in comparison with the free molecule. We attribute the shift in energy (2.25 eV) in the physisorbed molecule primarily to an image potential effect. We identify the increased bond length of the chemisorbed molecule as an important factor in the larger shift (5.75 eV) observed in this case. This conclusion is supported by a consideration of data for adsorbed molecules containing the CO group. C1 OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. RP UNIV CAMBRIDGE, CAVENDISH LAB, MADINGLEY RD, CAMBRIDGE CB3 0HE, ENGLAND. RI Palmer, Richard/A-5366-2008 OI Palmer, Richard/0000-0001-8728-8083 NR 45 TC 23 Z9 23 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 EI 1873-4448 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD JUL 23 PY 1993 VL 210 IS 1-3 BP 15 EP 20 DI 10.1016/0009-2614(93)89092-V PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LM700 UT WOS:A1993LM70000004 ER PT J AU BARTELS, DM HAN, P PERCIVAL, PW AF BARTELS, DM HAN, P PERCIVAL, PW TI DIFFUSION OF ATOMIC-HYDROGEN IN ICE-IH SO CHEMICAL PHYSICS LETTERS LA English DT Article ID SPIN EXCHANGE; FREE-RADICALS; MUONIUM; WATER AB We report new measurements of EPR spin relaxation times T1 and T2 for H atoms in hexagonal ice at -6-degrees-C. We find T1 = 23 +/- 3 mus, and T2 = 6.9 +/- 1.0 mus at this temperature, in good agreement with expectation based on previous experiments. Motional correlation times have been calculated from these values and from previous T2 measurements for H and D atoms in isotopically mixed ice. The hopping rate deduced - 2.8 x 10(10) s-1 near the crystal melting point, implies a diffusion rate of H atoms in ice nearly as fast as occurs in liquid water. C1 SIMON FRASER UNIV,DEPT CHEM,BURNABY V5A 1S6,BC,CANADA. SIMON FRASER UNIV,TRIUMF,BURNABY V5A 1S6,BC,CANADA. RP BARTELS, DM (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. OI Percival, Paul/0000-0002-6512-128X NR 17 TC 11 Z9 11 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD JUL 23 PY 1993 VL 210 IS 1-3 BP 129 EP 134 DI 10.1016/0009-2614(93)89112-U PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LM700 UT WOS:A1993LM70000024 ER PT J AU MCDOWELL, HK TSAI, P CLOGSTON, AM AF MCDOWELL, HK TSAI, P CLOGSTON, AM TI MAXIMUM-ENTROPY APPROACH IN MOLECULAR TIMESCALE GENERALIZED LANGEVIN EQUATION THEORY SO CHEMICAL PHYSICS LETTERS LA English DT Article ID COUPLED VIBRATIONAL-MODES; SELF-TRAPPED STATES AB The principle of maximum entropy is used to develop a procedure for obtaining the best fit to a spectral distribution within the context of molecular timescale generalized Langevin equation theory. Results are obtained for a single-vibron model and compared with previously computed results. Excellent agreement is demonstrated and the maximum entropy approach is shown to be a robust procedure. C1 LOS ALAMOS NATL LAB,CTR MAT SCI,MS K765,LOS ALAMOS,NM 87545. RP MCDOWELL, HK (reprint author), UNIV TEXAS,DEPT CHEM,ARLINGTON,TX 76019, USA. NR 7 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD JUL 23 PY 1993 VL 210 IS 1-3 BP 274 EP 278 DI 10.1016/0009-2614(93)89133-3 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LM700 UT WOS:A1993LM70000045 ER PT J AU LOEHLE, C AF LOEHLE, C TI GEOLOGIC METHANE AS A SOURCE FOR POSTGLACIAL CO2 INCREASES - THE HYDROCARBON PUMP HYPOTHESIS SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID VOSTOK ICE CORE; CARBON ISOTOPIC COMPOSITION; LAST CLIMATIC CYCLE; ATMOSPHERIC METHANE; RECORD; C-14 AB This paper evaluates the hypothesis that historical CO2 levels could have been governed by releases of geologic methane. Methane clathrates and natural gas could have contributed to CO2 increases at the ends of the last two glacial periods. Computations indicate that oxidation of CH4 to CO2 could have rapidly provided enough CO2 to cause historical CO2 changes. A simple dynamic model, the hydrocarbon pump, for methane as the source term for changes in CO2 over the glacial cycles matches several features of the historical record. If methane clathrates were the source of CO2, then CO2 at the interglacial transitions should be depleted in C-14 because of the low C-14 levels in C from this source. Evidence is presented that this is the case. C-13 data are also evaluated. Overall, CH4 is a credible source for CO2, but definitive conclusions await further data. RP LOEHLE, C (reprint author), ARGONNE NATL LAB,DIV ENVIRONM RES,ARGONNE,IL 60439, USA. NR 22 TC 5 Z9 5 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD JUL 23 PY 1993 VL 20 IS 14 BP 1415 EP 1418 DI 10.1029/93GL01518 PG 4 WC Geosciences, Multidisciplinary SC Geology GA LQ439 UT WOS:A1993LQ43900002 ER PT J AU HESSE, M BIRN, J AF HESSE, M BIRN, J TI ON THE ENERGY BUDGET IN THE CURRENT DISRUPTION REGION SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID PLASMA SHEET; MAGNETOTAIL; TAIL AB This study investigates the energy budget in the current disruption region of the magnetotail, coincident with a pre-onset thin current sheet, around substorm onset time using published observational data and theoretical estimates. We find that the current disruption/dipolarization process typically requires energy inflow into the primary disruption region. The disruption dipolarization process is therefore endoenergetic, i.e., requires energy input to operate. Therefore we argue that some other simultaneously operating process, possibly a large scale magnetotail instability, is required to provide the necessary energy input into the current disruption region. C1 LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RP NASA, GODDARD SPACE FLIGHT CTR, ELECTRODYNAM BRANCH, CODE 696, GREENBELT, MD 20771 USA. RI Hesse, Michael/D-2031-2012 NR 16 TC 19 Z9 19 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 EI 1944-8007 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD JUL 23 PY 1993 VL 20 IS 14 BP 1451 EP 1454 DI 10.1029/93GL01587 PG 4 WC Geosciences, Multidisciplinary SC Geology GA LQ439 UT WOS:A1993LQ43900011 ER PT J AU ZAROMB, S ALCARAZ, J LAWSON, D WOO, CS AF ZAROMB, S ALCARAZ, J LAWSON, D WOO, CS TI DETECTION OF AIRBORNE COCAINE AND HEROIN BY HIGH-THROUGHPUT LIQUID-ABSORPTION PRECONCENTRATION AND LIQUID-CHROMATOGRAPHY ELECTROCHEMICAL DETECTION SO JOURNAL OF CHROMATOGRAPHY LA English DT Article AB A high-throughput liquid-absorption preconcentrator (HTLAP) for rapid and/or ultrasensitive detection and analysis of trace contaminants samples air at a rate of 600-700 l/min and collects analytes from vapors or aerosols at an efficiency of 40-60% into a small volume of liquid absorbent dripping at a rate of 0.1-2 ml/min. These features combine to reduce the lower detection limit (LDL) of available analytical instrumentation by a factor of > 1000 and/or to permit faster sampling and far more rapid on-site air monitoring than were previously practicable. LDLs of ca. 1:10(13) (v/v) of alkaloids have been achieved with LC and electrochemical detection. The HTLAP is directly adaptable to most liquid-phase analyzers. The small rate of liquid collection is also compatible with available interfaces to mass spectrometers. Moreover, the HTLAP permits detection and quantitation of polar or highly reactive compounds that cannot be readily analyzed by conventional preconcentration and GC. C1 ARGONNE NATL LAB,DIV ENVIRONM RES,ARGONNE,IL 60439. UNIV NO IOWA,DEPT CHEM,CEDAR FALLS,IA 50614. NR 11 TC 9 Z9 9 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD JUL 23 PY 1993 VL 643 IS 1-2 BP 107 EP 115 DI 10.1016/0021-9673(93)80545-J PG 9 WC Chemistry, Analytical SC Chemistry GA LP651 UT WOS:A1993LP65100011 PM 8360298 ER PT J AU ZANDT, G CARRIGAN, CR AF ZANDT, G CARRIGAN, CR TI SMALL-SCALE CONVECTIVE INSTABILITY AND UPPER-MANTLE VISCOSITY UNDER CALIFORNIA SO SCIENCE LA English DT Article ID SOUTHERN-CALIFORNIA; NORTHERN CALIFORNIA; THERMAL STRUCTURE; PLATE-TECTONICS; EARTHS MANTLE; LITHOSPHERE; FLOW; TEMPERATURE; EVOLUTION; GEOMETRY AB Thermal calculations and convection analysis, constrained by seismic tomography results, suggest that a small-scale convective instability developed in the upper 200 kilometers of the mantle under California after the upwelling and cooling of asthenosphere into the slab window associated with the formation of the San Andreas transform boundary. The upper bound for the upper mantle viscosity in the slab window, 5 x 10(19) pascal seconds, is similar to independent estimates for the asthenosphere beneath young oceanic and tectonically active continental regions. These model calculations suggest that many tectonically active continental regions characterized by low upper mantle seismic velocities may be affected by time-dependent small-scale convection that can generate localized areas of uplift and subsidence. RP ZANDT, G (reprint author), LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,DIV EARTH SCI,L-202,LIVERMORE,CA 94550, USA. NR 41 TC 52 Z9 53 U1 0 U2 4 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUL 23 PY 1993 VL 261 IS 5120 BP 460 EP 463 DI 10.1126/science.261.5120.460 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LN623 UT WOS:A1993LN62300032 PM 17770025 ER PT J AU RADAELLI, PG JORGENSEN, JD AF RADAELLI, PG JORGENSEN, JD TI SUPERCONDUCTIVITY - PRESSING FOR BETTER RESULTS SO NATURE LA English DT Editorial Material ID CU-O SYSTEM C1 ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439. RP RADAELLI, PG (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Radaelli, Paolo/C-2952-2011 OI Radaelli, Paolo/0000-0002-6717-035X NR 11 TC 10 Z9 10 U1 2 U2 2 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD JUL 22 PY 1993 VL 364 IS 6435 BP 286 EP 287 DI 10.1038/364286a0 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LN570 UT WOS:A1993LN57000029 ER PT J AU MCKELLAR, BHJ STEPHENSON, GJ THOMSON, MJ AF MCKELLAR, BHJ STEPHENSON, GJ THOMSON, MJ TI THE DIRAC-EQUATION IN KERR SPACETIME, SPHEROIDAL COORDINATES AND THE MIT BAG MODEL OF HADRONS SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Article ID NEUTRINO AB The Dirac equation in Kerr spacetime is separated using the rotating tetrad formalism. This allows solutions of the Dirac equation, in flat spacetime, written in oblate and prolate spheroidal coordinates to be extracted. The usual MIT bag boundary condition, -igamma(mu)n(nu)PSI = PSI is then found to be incompatible with a non-vanishing separated wavefunction except in the spherical limit. However, it is shown that an alternative boundary condition exists that is physically motivated and allows for a non-trivial solution. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP MCKELLAR, BHJ (reprint author), UNIV MELBOURNE,SCH PHYS,HIGH ENERGY PHYS RES CTR,PARKVILLE,VIC 3052,AUSTRALIA. NR 16 TC 4 Z9 4 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 JUL 21 PY 1993 VL 26 IS 14 BP 3649 EP 3657 DI 10.1088/0305-4470/26/14/025 PG 9 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA LT054 UT WOS:A1993LT05400025 ER PT J AU OKINO, F BARTLETT, N AF OKINO, F BARTLETT, N TI HEXAFLUOROARSENATES OF GRAPHITE FROM ITS INTERACTION WITH ASF5,ASF5+F2, AND O2ASF6, AND THE STRUCTURE OF C14ASF6 SO JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS LA English DT Article ID INTERCALATION AB The F:As molar ratio for the vacuum-stable products obtained following treatment of graphite, at room temperature, with (1) AsF5, (2) AsF5 + F2, and (3) O2AsF6, has been established to be 6. X-Ray absorption spectra, in the arsenic-K pre-absorption edge region, indicate that the guest species in the vacuum-stable products via route (1) is AsF6-. Route (1) gives mixtures of stage-one and -two salts whereas (2) and (3) readily yield stage-one materials. This is attributed to the greater oxidizing potential of the reagents in (2) and (3). The volatiles from route (1) are AsF5 and AsF3, and from (2) AsF5. The c-axis repeat distance (I(c)) of the vacuum-stable hexafluoroarsenates of formula C14nAsF6 (where n is the stage) is ca. 7.6 + 3.35(n - 1) angstrom. X-Ray powder diffraction data for C14AsF6 (I(c) almost-equal-to 7.6 angstrom) indicate that the fluoride ligands of AsF6- are nestled in contiguous three-fold sets of carbon atom hexagons of the graphite. This requires a staggering of the enclosing carbon layers. Adjacent pairs of carbon atom sheets contain assemblies of AsF6- of short range order. The ordered anion arrangement is that of closest packing for nestled AsF6-. Aside from the restriction imposed by AsF6- nestling, the carbon layers are randomly stacked. In cases where the graphite galleries are richer in arsenic fluoride guests (C(x)AsF(y); 8 less-than-or-equal-to x < 14, 5 less-than-or-equal-to y less-than-or-equal-to 6), the I(c) distances are larger (ca. 8.0 angstrom) and the enclosing carbon layers are eclipsed. C1 LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. NR 42 TC 11 Z9 11 U1 0 U2 4 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0300-9246 J9 J CHEM SOC DALTON JI J. Chem. Soc.-Dalton Trans. PD JUL 21 PY 1993 IS 14 BP 2081 EP 2090 DI 10.1039/dt9930002081 PG 10 WC Chemistry, Inorganic & Nuclear SC Chemistry GA LP699 UT WOS:A1993LP69900001 ER PT J AU MCRAE, TG KULP, TJ AF MCRAE, TG KULP, TJ TI BACKSCATTER ABSORPTION GAS IMAGING - A NEW TECHNIQUE FOR GAS VISUALIZATION SO APPLIED OPTICS LA English DT Article DE LASER; LIDAR; DIFFERENTIAL ABSORPTION LIDAR; IMAGING; REMOTE SENSING; LASER RADAR; INFRARED; SCANNING; ACTIVE IMAGING ID CO2-LASER AB This paper presents a new laser-based method of gas detection that permits real-time television images of gases to be produced. The principle of this technique [which is called backscatter absorption ps imaging (BAGI)] and the operation of two instruments used to implement it are described. These instruments use 5-W and 20-W CO2 lasers to achieve gas imaging at ranges of approximately 30 and 125 m, respectively. Derivations of relevant BAGI signal equations that can be used to predict the performance of a gas imager are provided. The predictions of this model and the measured range performance of an extended-range gas imager are compared. Finally, the results of gas sensitivity measurements and imaging tests on flowing gases are presented. These can be used to generate a realistic estimate of the BAGI sensitivity expected in detecting leaks of many different vapors. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 19 TC 24 Z9 24 U1 3 U2 7 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JUL 20 PY 1993 VL 32 IS 21 BP 4037 EP 4050 PG 14 WC Optics SC Optics GA LN837 UT WOS:A1993LN83700036 PM 20830045 ER PT J AU AHLEN, S AMBROSIO, M ANTOLINI, R AURIEMMA, G BALDINI, A BAM, B BARBARINO, G BARISH, B BATTISTONI, G BELLOTTI, R BEMPORAD, C BERNARDINI, P BILOKON, H BISI, V BLOISE, C BUSSINO, S CAFAGNA, F CALICCHIO, M CAMPANA, P CAMPANA, D CARBONI, M CECCHINI, S CEI, F CHIARELLA, V CHIERA, C COBIS, A CORMACK, R CORONA, A COUTU, S DECATALDO, G DEKHISSI, H DEMARZO, C DEVINCENZI, M DICREDICO, A DIEHL, E ERRIQUEZ, O FAVUZZI, C FICENEC, D FORTI, C FOTI, L FUSCO, P GIACOMELLI, G GIANNINI, G GIGLIETTO, N GIUBELLINO, P GRASSI, M GREEN, P GRILLO, A GUARINO, F GUSTAVINO, C HABIG, A HEINZ, R HONG, J IAROCCI, E KATSAVOUNIDIS, E KEARNS, E KLEIN, S KYRIAZOPOULOU, S LAMANNA, E LANE, C LEE, C LEVIN, D LIPARI, P LIU, G LIU, R LONGO, M LUDLAM, G MANCARELLA, G MANDRIOLI, G MARGIOTTANERI, A MARIN, A MARINI, A MARTELLO, D MARTELLOTTI, G CHIESA, AM MASERA, M MATTEUZZI, P MICHAEL, D MILLER, JL MONACELLI, P MONTENO, M MUFSON, SL MUSSER, J NUTTER, S OKADA, C OSTERIA, G PALAMARA, O PARLATI, S PATERA, V PATRIZII, L PAZZI, R PECK, C PETRAKIS, J PETRERA, S PIGNATANO, N PISTILLI, P PREDIERI, F RAMELLO, L REYNOLDSON, J RONGA, F ROSA, G SATRIANO, C SATTA, L SCAPPARONE, E SCHOLBERG, K SCIUBBA, A LUGARESI, PS SEVERI, M SITTA, M SPINELLI, P SPINETTI, M SPURIO, M STEELE, J STEINBERG, R STONE, J SULAK, L SURDO, A TARLE, G TOGO, V VALENTE, V VERDONE, G WALTER, C WEBB, R WORSTELL, W AF AHLEN, S AMBROSIO, M ANTOLINI, R AURIEMMA, G BALDINI, A BAM, B BARBARINO, G BARISH, B BATTISTONI, G BELLOTTI, R BEMPORAD, C BERNARDINI, P BILOKON, H BISI, V BLOISE, C BUSSINO, S CAFAGNA, F CALICCHIO, M CAMPANA, P CAMPANA, D CARBONI, M CECCHINI, S CEI, F CHIARELLA, V CHIERA, C COBIS, A CORMACK, R CORONA, A COUTU, S DECATALDO, G DEKHISSI, H DEMARZO, C DEVINCENZI, M DICREDICO, A DIEHL, E ERRIQUEZ, O FAVUZZI, C FICENEC, D FORTI, C FOTI, L FUSCO, P GIACOMELLI, G GIANNINI, G GIGLIETTO, N GIUBELLINO, P GRASSI, M GREEN, P GRILLO, A GUARINO, F GUSTAVINO, C HABIG, A HEINZ, R HONG, J IAROCCI, E KATSAVOUNIDIS, E KEARNS, E KLEIN, S KYRIAZOPOULOU, S LAMANNA, E LANE, C LEE, C LEVIN, D LIPARI, P LIU, G LIU, R LONGO, M LUDLAM, G MANCARELLA, G MANDRIOLI, G MARGIOTTANERI, A MARIN, A MARINI, A MARTELLO, D MARTELLOTTI, G CHIESA, AM MASERA, M MATTEUZZI, P MICHAEL, D MILLER, JL MONACELLI, P MONTENO, M MUFSON, SL MUSSER, J NUTTER, S OKADA, C OSTERIA, G PALAMARA, O PARLATI, S PATERA, V PATRIZII, L PAZZI, R PECK, C PETRAKIS, J PETRERA, S PIGNATANO, N PISTILLI, P PREDIERI, F RAMELLO, L REYNOLDSON, J RONGA, F ROSA, G SATRIANO, C SATTA, L SCAPPARONE, E SCHOLBERG, K SCIUBBA, A LUGARESI, PS SEVERI, M SITTA, M SPINELLI, P SPINETTI, M SPURIO, M STEELE, J STEINBERG, R STONE, J SULAK, L SURDO, A TARLE, G TOGO, V VALENTE, V VERDONE, G WALTER, C WEBB, R WORSTELL, W TI MUON ASTRONOMY WITH THE MACRO DETECTOR SO ASTROPHYSICAL JOURNAL LA English DT Article DE ELEMENTARY PARTICLES; GAMMA RAYS, OBSERVATIONS ID UNDERGROUND MUONS; CYGNUS-X-3; DIRECTION; SEARCH; SPECTRUM; ENERGIES AB We have analyzed a sample of 1.8 x 10(6) muons with E(mu) greater-than-or-similar-to 1.3 TeV collected by the first and second supermodules of the MACRO detector at Gran Sasso during the period 1989 February to 1991 February. We have searched for an excess of muons of celestial origin over cosmic-ray background. Our search for steady sources in solid angle bins of DELTAOMEGA almost-equal-to 3.0-degrees x 3.0-degrees in the declination range -5-degrees less-than-or-equal-to delta less-than-or-equal-to 90-degrees was negative; the upper limit with 95% C.L. to the muon flux at mid-latitudes (delta approximately 45-degrees) is J(mu)steady less-than-or-similar-to 2 x 10(-12) cm-2 s-1. In addition, we have searched for muon excesses modulated by the orbital period of selected X-ray sources, including Cyg X-3, Cyg X-1, Her X-1, 4U 0115+63, and 4U 1907+09. For Cyg X-3 we obtained an upper limit with 95% C.L. of J(mu)mod less-than-or-equal-to 8.8 x 10(-13) cm-2 s-1. Further, we have no evidence of any bursting activity from Cyg X-3, during our search period, which includes the radio outburst of 1991 January. C1 UNIV NAPLES,DIPARTIMENTO FIS,I-80125 NAPLES,ITALY. INFN,I-80125 NAPLES,ITALY. UNIV ROME,DIPARTIMENTO FIS,I-00185 ROME,ITALY. INFN,I-00185 ROME,ITALY. UNIV BASILICATA,I-85100 POTENZA,ITALY. UNIV PISA,DIPARTIMENTO FIS,I-56010 PISA,ITALY. CALTECH,PASADENA,CA 91125. INFN,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. UNIV BARI,DIPARTIMENTO FIS,I-70126 BARI,ITALY. UNIV LECCE,I-73100 LECCE,ITALY. UNIV TURIN,DIPARTIMENTO FIS,I-10125 TURIN,ITALY. CNR,IST TESRE,I-40126 BOLOGNA,ITALY. INFN,I-70126 BARI,ITALY. INFN,I-10125 TURIN,ITALY. UNIV MOHAMMED IER,DEPT PHYS,OUJDA,MOROCCO. UNIV LAQUILA,DIPARTIMENTO FIS,I-67100 LAQUILA,ITALY. UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109. UNIV TRIESTE,I-34100 TRIESTE,ITALY. INFN,I-34100 TRIESTE,ITALY. INFN,LAB NAZL GRAN SASSO,I-67010 LAQUILA,ITALY. INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47405. INDIANA UNIV,DEPT ASTRON,BLOOMINGTON,IN 47405. UNIV ROME,DIPARTIMENTO ENERGET,I-00100 ROME,ITALY. DREXEL UNIV,DEPT PHYS,PHILADELPHIA,PA 19104. INFN,I-67100 LAQUILA,ITALY. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. UNIV DELAWARE,BARTOL RES INST,NEWARK,DE 19716. TEXAS A&M UNIV SYST,DEPT PHYS,COLL STN,TX 77843. RP AHLEN, S (reprint author), BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215, USA. RI Spurio, Maurizio/G-4170-2012; giglietto, nicola/I-8951-2012; Cafagna, Francesco/A-9299-2010; Masera, Massimo/J-4313-2012; Ramello, Luciano/F-9357-2013; Lamanna, Ernesto/C-7658-2012; Barbarino, Giancarlo/L-2559-2015; Martello, Daniele/J-3131-2012; Cei, Fabrizio/M-8891-2016; Guarino, Fausto/I-3166-2012; gustavino, carlo/K-4355-2015; OI Cormack, Robert/0000-0001-5553-9984; giglietto, nicola/0000-0002-9021-2888; Cafagna, Francesco/0000-0002-7450-4784; Lamanna, Ernesto/0000-0002-7844-8230; Barbarino, Giancarlo/0000-0001-9253-3397; Martello, Daniele/0000-0003-2046-3910; Cei, Fabrizio/0000-0002-8313-3540; Guarino, Fausto/0000-0003-1427-9885; Masera, Massimo/0000-0003-1880-5467; Coutu, Stephane/0000-0003-2923-2246; Monteno, Marco/0000-0002-3521-6333; ERRIQUEZ, Onofrio/0000-0002-9784-6568; Bellotti, Roberto/0000-0003-3198-2708; gustavino, carlo/0000-0003-3232-7027; Carboni, Massimo/0000-0003-4296-3799; Petrera, Sergio/0000-0002-6029-1255 NR 45 TC 27 Z9 27 U1 0 U2 7 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUL 20 PY 1993 VL 412 IS 1 BP 301 EP 311 DI 10.1086/172921 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LM214 UT WOS:A1993LM21400026 ER PT J AU GEHMEYR, M AF GEHMEYR, M TI ON NONLINEAR RADIAL OSCILLATIONS IN CONVECTIVE RR LYRAE STARS .3. A FULL-AMPLITUDE INVESTIGATION OF THE RED EDGE SO ASTROPHYSICAL JOURNAL LA English DT Article ID LOCAL GROUP GALAXIES; PULSATING STARS; STABILITY AB An adaptive-grid algorithm is employed to construct a sequence of convective RR Lyrae envelopes with varying effective temperatures. For the first time, the theoretical red edge is derived and analyzed from full-amplitude models. ''Convective quenching'' is confirmed as the mechanism that stalls the pulsational driving when the red edge is approached from within the instability strip. It is demonstrated that the theoretical properties of this approach are qualitatively consistent with the empirical properties. A quantitative comparison, however, depends strongly on details of the convection model. C1 UNIV ILLINOIS,DEPT ASTRON,URBANA,IL 61801. RP GEHMEYR, M (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. NR 23 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 JUL 20 PY 1993 VL 412 IS 1 BP 341 EP 350 DI 10.1086/172924 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LM214 UT WOS:A1993LM21400029 ER PT J AU GUPTA, G GARCIA, AE GUO, Q LU, M KALLENBACH, NR AF GUPTA, G GARCIA, AE GUO, Q LU, M KALLENBACH, NR TI STRUCTURE OF A PARALLEL-STRANDED TETRAMER OF THE OXYTRICHA TELOMERIC DNA-SEQUENCE DT4G4 SO BIOCHEMISTRY LA English DT Article ID POLYINOSINIC ACID; POLYGUANYLIC ACID; 3' TERMINUS; OLIGONUCLEOTIDES; COMPLEXES; SODIUM AB We report here the determination of the solution structure of the single-copy tetramer of the sequence dT4G4, the unit repeat in telomeres of the ciliated protozoan Oxytricha, in the presence of potassium ions. This is accomplished by a combination of sequential assignments and distance determinations from 2D proton NMR with model building, based on conformational analysis of the structure using a full-matrix NOESY simulation and molecular dynamics. Each strand in this tetramer structure has an identical environment and conformation: a parallel-stranded, right-handed helix, with all nucleotides in the C2'-endo, anti configuration. The T flanking the G cluster stacks in a 4-fold symmetrical helical array, while the remaining T's become increasingly flexible and sample multiple stacked configurations. C1 NYU,DEPT CHEM,NEW YORK,NY 10003. LOS ALAMOS NATL LAB,GRP T10,LOS ALAMOS,NM 87545. FU NCI NIH HHS [CA 24101] NR 24 TC 71 Z9 73 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD JUL 20 PY 1993 VL 32 IS 28 BP 7098 EP 7103 DI 10.1021/bi00079a005 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA LN988 UT WOS:A1993LN98800005 PM 8393704 ER PT J AU DAMERON, CT GEORGE, GN ARNOLD, P SANTHANAGOPALAN, V WINGE, DR AF DAMERON, CT GEORGE, GN ARNOLD, P SANTHANAGOPALAN, V WINGE, DR TI DISTINCT METAL-BINDING CONFIGURATIONS IN ACE1 SO BIOCHEMISTRY LA English DT Article ID METALLOTHIONEIN GENE-TRANSCRIPTION; UPSTREAM ACTIVATION SEQUENCES; ABSORPTION FINE-STRUCTURE; YEAST METALLOTHIONEIN; SACCHAROMYCES-CEREVISIAE; CRYSTAL-STRUCTURE; DNA-BINDING; COPPER; EXPRESSION; CLUSTER AB The ACE1 protein of Saccharomyces cerevisiae mediates the metal-induced expression of the CUP1 metallothionein (MT) genes. Curiously, ACE1 resembles the MT protein in the types of metal complexes that form. ACE1 binds Cd(II) and Cu(I) ions in distinct configurations, but only the Cu(I) conformer of ACE1 forms a high-affinity and specific complex with DNA. Cu(I) ions associated with ACE1 are known to assemble in a polymetallic Cu(I)-thiolate cluster that resembles Cu-metallothionein in metal coordination properties [Dameron, C. T., Winge, D. R., George, G. N., Sansone, M., Hu, S., & Hamer, D. (1991) Proc. Natl. Acad. Sci. U.S.A. 88, 6127-6131]. In contrast to the Cu(I) nuclearity of 6-7 mol equiv in ACE1 and 7 mol equiv in yeast MT, divalent ions, including Cd(II), Zn(II), and Co(II), bind with a maximal stoichiometry of near 4 mol equiv in ACE1 and 4 mol equiv in yeast MT. Charge-transfer bands consistent with metal:thiolate coordination were observed in CdACE1 and CoACE1. Spectroscopic studies of Co(II)ACE1 and EXAFS analysis of Cd(II)ACE1 revealed tetrahedral coordination geometry in these complexes. Similar tetrahedral coordination complexes were observed with Co(II) and Cd(II) complexes of MT from S. cerevisiae. Metal binding in ACE1 is clearly similar to that in MT, and therefore the MT-metal clusters appear to be a good structural model of the metal center of ACE1. C1 UNIV UTAH,MED CTR,SALT LAKE CITY,UT 84132. STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. RI George, Graham/E-3290-2013 FU NIDDK NIH HHS [5T32 DK 07115]; NIEHS NIH HHS [ES 03817] NR 53 TC 28 Z9 29 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 JUL 20 PY 1993 VL 32 IS 28 BP 7294 EP 7301 DI 10.1021/bi00079a028 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA LN988 UT WOS:A1993LN98800028 PM 8343519 ER PT J AU CARLOS, BA CHIPERA, SJ BISH, DL CRAVEN, SJ AF CARLOS, BA CHIPERA, SJ BISH, DL CRAVEN, SJ TI FRACTURE-LINING MANGANESE OXIDE MINERALS IN SILICIC TUFF, YUCCA MOUNTAIN, NEVADA, USA SO CHEMICAL GEOLOGY LA English DT Article ID CATION DISPLACEMENTS; METAL-IONS; FE OXIDES; CRYPTOMELANE; HOLLANDITES; REFINEMENT; RANCIEITE; INTERFACE; COMPLEX; DIOXIDE AB Yucca Mountain, Nevada, is currently under investigation to determine its suitability as a potential host for the first U.S. high-level nuclear waste repository. Yucca Mountain is composed of a thick sequence of silicic volcanic tuffs and subordinate lavas which in some areas have been extensively altered to zeolite minerals. Since fractures may act as transport pathways or conduits for fluids moving through and away from a potential repository, the nature of the minerals lining the walls of fractures is of great importance. Mn-oxide minerals in particular are important since they show strong retardation capabilities for transuranic elements such as U, Np, Pu and Am. This study focused on the mineralogy, chemistry and distribution of the Mn-oxides at Yucca Mountain using X-ray diffraction and optical and electron microscopy. The major Mn-oxide minerals identified were aurorite, cryptomelane/hollandite/coronadite, lithiophorite, pyrolusite, rancieite and todorokite. Mn-oxide mineralogy appears to be controlled both by stratigraphy and by position relative to the static water level (SWL). For example, rancieite was found predominantly in the Paintbrush Tuff both above and below the SWL. Aurorite, pyrolusite, todorokite and the cryptometane group minerals, although found in several stratigraphic units, occur only below the SWL. Additionally, mineral chemistry varies widely over short distances, suggesting that the chemical composition of the minerals must have been strongly influenced by local variations in water chemistry. Chemical analyses of the cryptomelane group minerals suggest the existence of al least partial solid solution between hollandite (Ba) and the isostructural minerals cryptomelane (K) and coronadite (Pb). C1 SMITH COLL,DEPT GEOL,NORTHAMPTON,MA 01063. RP CARLOS, BA (reprint author), LOS ALAMOS NATL LAB,DIV EARTH & ENVIRONM SCI,LOS ALAMOS,NM 87545, USA. NR 73 TC 27 Z9 27 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2541 J9 CHEM GEOL JI Chem. Geol. PD JUL 20 PY 1993 VL 107 IS 1-2 BP 47 EP 69 DI 10.1016/0009-2541(93)90101-N PG 23 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA LP588 UT WOS:A1993LP58800004 ER PT J AU BATON, SD BALDIS, HA JALINAUD, T LABAUNE, C AF BATON, SD BALDIS, HA JALINAUD, T LABAUNE, C TI FINE-SCALE SPATIAL AND TEMPORAL STRUCTURES OF 2ND-HARMONIC EMISSION FROM AN UNDERDENSE PLASMA SO EUROPHYSICS LETTERS LA English DT Article ID HARMONIC-GENERATION; LASER FILAMENTATION AB Second-harmonic emission during the interaction between a laser beam and an underdense preformed plasma has been studied simultaneously using time-resolved images as well as two-dimensional time-integrated images. The emission appeared with very localized structures in space and pulsed in time. These structures are consistent with the presence of filamentary structures whose presence has been confirmed by Schlieren diagnostic. The spatial dimensions of the observed second-harmonic emission is in agreement with the scale length of the filamentation instability. The characterization of second-harmonic emission appears to be a potential diagnostic for filamentation. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP BATON, SD (reprint author), ECOLE POLYTECH,UTILISAT LASERS INTENSES LAB,F-91128 PALAISEAU,FRANCE. NR 18 TC 9 Z9 9 U1 0 U2 1 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD JUL 20 PY 1993 VL 23 IS 3 BP 191 EP 196 DI 10.1209/0295-5075/23/3/006 PG 6 WC Physics, Multidisciplinary SC Physics GA LQ422 UT WOS:A1993LQ42200006 ER PT J AU KAKURAI, K STEINER, M PYNN, R AF KAKURAI, K STEINER, M PYNN, R TI MAGNETIC EXCITATIONS AND POLARIZATION ANALYSIS METHOD SO INTERNATIONAL JOURNAL OF MODERN PHYSICS B LA English DT Article ID GROUND-STATE PROPERTIES; MONTE-CARLO CALCULATION; NEUTRON-SCATTERING; HEISENBERG-ANTIFERROMAGNET; FERROMAGNETIC CHAIN; SPIN FLUCTUATIONS; HALDANE GAP; EASY-PLANE; ELEMENTARY EXCITATION; INELASTIC-SCATTERING AB With the recent advances of efficient polarizing and flipping devices and with the increase of the absolute flux at modern neutron sources, polarized neutron inelastic scattering experiments using cold and thermal neutrons have become more commonplace. In this review paper we present experiments recently performed where this technique has been applied to obtain more detailed informations on magnetic excitations thus contributing to a deeper understanding of the spin dynamics in magnetic materials. C1 HAHN MEITNER INST BERLIN GMBH,W-1000 BERLIN 39,GERMANY. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP KAKURAI, K (reprint author), UNIV TOKYO,INST SOLID STATE PHYS,ROPPONGI 7-22-1,MINATO KU,TOKYO 106,JAPAN. NR 75 TC 3 Z9 3 U1 1 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-9792 J9 INT J MOD PHYS B JI Int. J. Mod. Phys. B PD JUL 20 PY 1993 VL 7 IS 16-17 BP 3095 EP 3111 DI 10.1142/S0217979293003176 PG 17 WC Physics, Applied; Physics, Condensed Matter; Physics, Mathematical SC Physics GA LL072 UT WOS:A1993LL07200011 ER PT J AU NEWCOMB, WW TRUS, BL BOOY, FP STEVEN, AC WALL, JS BROWN, JC AF NEWCOMB, WW TRUS, BL BOOY, FP STEVEN, AC WALL, JS BROWN, JC TI STRUCTURE OF THE HERPES-SIMPLEX VIRUS CAPSID - MOLECULAR COMPOSITION OF THE PENTONS AND THE TRIPLEXES SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE HERPES SIMPLEX VIRUS; CAPSID STRUCTURE; PENTON COMPOSITION; CRYOELECTRON MICROSCOPY; SCANNING TRANSMISSION ELECTRON MICROSCOPY ID TRANSMISSION ELECTRON-MICROSCOPY; CRYOELECTRON MICROSCOPY; 3-DIMENSIONAL STRUCTURE; EQUINE HERPESVIRUS-1; BACTERIOPHAGE-LAMBDA; SURFACE LATTICE; SIMIAN VIRUS-40; PROTEIN; IDENTIFICATION; LOCALIZATION C1 UNIV VIRGINIA,HLTH SCI CTR,DEPT MICROBIOL,CHARLOTTESVILLE,VA 22908. UNIV VIRGINIA,HLTH SCI CTR,CTR CANC,CHARLOTTESVILLE,VA 22908. NIAMSD,STRUCT BIOL LAB,BETHESDA,MD 20892. NIH,DIV COMP RES & TECHNOL,COMP SYST LAB,BETHESDA,MD 20892. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. FU NIGMS NIH HHS [GM34036] NR 57 TC 204 Z9 206 U1 0 U2 9 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD JUL 20 PY 1993 VL 232 IS 2 BP 499 EP 511 DI 10.1006/jmbi.1993.1406 PG 13 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA LQ985 UT WOS:A1993LQ98500015 PM 8393939 ER PT J AU SCOTT, WG MILLIGAN, DL MILBURN, MV PRIVE, GG YEH, J KOSHLAND, DE KIM, SH AF SCOTT, WG MILLIGAN, DL MILBURN, MV PRIVE, GG YEH, J KOSHLAND, DE KIM, SH TI REFINED STRUCTURES OF THE LIGAND-BINDING DOMAIN OF THE ASPARTATE RECEPTOR FROM SALMONELLA-TYPHIMURIUM SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE RECEPTOR; STRUCTURE; CHEMOTAXIS; TRANSMEMBRANE; LIGAND-BINDING ID DISULFIDE CROSS-LINKING; HUMAN INSULIN-RECEPTOR; ESCHERICHIA-COLI; BACTERIAL CHEMOTAXIS; SIGNAL TRANSDUCTION; SENSORY RECEPTOR; PROTEIN STRUCTURES; TAR CHEMORECEPTOR; DIFFRACTION DATA; KINASE FAMILY C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MOLEC & CELLULAR BIOL,BERKELEY,CA 94720. RP SCOTT, WG (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. RI Prive, Gilbert/A-3039-2008 FU NIAID NIH HHS [AI 30725]; NIDDK NIH HHS [DK09765] NR 78 TC 62 Z9 62 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD JUL 20 PY 1993 VL 232 IS 2 BP 555 EP 573 DI 10.1006/jmbi.1993.1411 PG 19 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA LQ985 UT WOS:A1993LQ98500020 PM 8345523 ER PT J AU SCHLUMPF, F AF SCHLUMPF, F TI THE ELECTRIC AND MAGNETIC FORM-FACTORS OF THE NEUTRON SO MODERN PHYSICS LETTERS A LA English DT Article AB We derive the electric and magnetic form factors of the neutron in the framework of a relativistic constituent quark model. Our parameter free prediction agrees well with a recent, accurate measurement. The relativistic features of the model and the specific form of the wave function are essential for the result. Comparisons are made to other models based on vector meson dominance, perturbative QCD and QCD sum rules. RP SCHLUMPF, F (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 0 TC 9 Z9 9 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-7323 J9 MOD PHYS LETT A JI Mod. Phys. Lett. A PD JUL 20 PY 1993 VL 8 IS 22 BP 2135 EP 2140 DI 10.1142/S0217732393001859 PG 6 WC Physics, Nuclear; Physics, Particles & Fields; Physics, Mathematical SC Physics GA LU854 UT WOS:A1993LU85400011 ER PT J AU FOILES, SM AF FOILES, SM TI UNEXPECTED RELAXATION OF A AG LAYER ON CU(111) SO SURFACE SCIENCE LA English DT Article ID EMBEDDED-ATOM-METHOD; SURFACES; METALS AB The structure and energetics of a layer of Ag deposited on Cu(111) has been computed using the embedded atom method (EAM). The lowest energy structure of the overlayer is a pseudoepitaxial arrangement of the Ag with 8 unit cells of Ag aligned with 9 unit cells of Cu. The structure is consistent with experimental observations and similar theoretical calculations by Mottet, Treglia and Legrand. The unexpected aspect of the theoretical results is the calculated atomic relaxations of the surface. The surface is found to have the lowest vertical position where the Ag atoms are in top sites over the Cu. This disagrees with the usual expectations based on hard sphere ideas. This result is explained in terms of the improved bonding between the substrate and an adsorbate in a top site when the substrate forms a local depression around the site. RP FOILES, SM (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. OI Foiles, Stephen/0000-0002-1907-454X NR 16 TC 25 Z9 25 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUL 20 PY 1993 VL 292 IS 1-2 BP 5 EP 9 DI 10.1016/0039-6028(93)90385-W PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LM919 UT WOS:A1993LM91900010 ER PT J AU LO, CW VAREKAMP, PR SHUH, DK DURBIN, TD CHAKARIAN, V YARMOFF, JA AF LO, CW VAREKAMP, PR SHUH, DK DURBIN, TD CHAKARIAN, V YARMOFF, JA TI SUBSTRATE DISORDER-INDUCED BY A SURFACE CHEMICAL-REACTION - THE FLUORINE SILICON INTERACTION SO SURFACE SCIENCE LA English DT Article ID INITIAL-STAGES; SI(100)(2X1) SURFACE; SI; PHOTOEMISSION; ADSORPTION; DYNAMICS; ATOMS; XEF2; SPECTROSCOPY; OXIDATION AB Si(111) surfaces etched by XeF2 are studied with high-resolution soft X-ray photoelectron spectroscopy. After a sufficient exposure to XeF2, a thick fluorosilyl reaction layer forms on the surface. An inelastic loss feature in the Si2p core-level spectra collected from these surfaces indicates the presence of Si defects that have been created by the reaction. These defects are located both at the reaction layer/substrate interface and in the near-surface region of the substrate.-As suggested by earlier theoretical studies, it is proposed that the defects in the substrate are created by the excess heat liberated from the formation of exothermic Si-F bonds. Reaction-induced defects are an integral and essential part of the etching process, as they enable F to bond with subsurface Si and form the characteristic fluorosilyl reaction layer. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP LO, CW (reprint author), UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521, USA. NR 35 TC 23 Z9 23 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 JUL 20 PY 1993 VL 292 IS 1-2 BP 171 EP 181 DI 10.1016/0039-6028(93)90399-5 PG 11 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LM919 UT WOS:A1993LM91900024 ER PT J AU TANG, D SHI, X HESKETT, D TSUEI, KD AF TANG, D SHI, X HESKETT, D TSUEI, KD TI COADSORBATE-INDUCED ENHANCEMENT IN THE PHOTOEMISSION INTENSITY OF ALKALI CORE LEVELS SO SURFACE SCIENCE LA English DT Article ID VALENCE-ELECTRON STATES; METAL-SURFACES; OVERLAYER STATES; NA OVERLAYERS; + K; ADSORPTION; OXYGEN; COADSORPTION; CU(111); RU(001) AB The interaction of oxygen and CO with the alkali Na was studied with core level Photoemission using synchrotron radiation. We observed intensity increases in the Na2p core level by a factor of 1.5-2 for the systems O2/Na/Ni(111), CO/Na/Ni(111), O2/Na/Cu(110) and O2/Na/Cu(111). These enhancements were more or less independent of substrate, coadsorbate and alkali precoverage. We examine several models to explain these observations. C1 BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. RP TANG, D (reprint author), UNIV RHODE ISL, DEPT PHYS, KINGSTON, RI 02881 USA. NR 42 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUL 20 PY 1993 VL 292 IS 1-2 BP 182 EP 188 DI 10.1016/0039-6028(93)90400-E PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LM919 UT WOS:A1993LM91900025 ER PT J AU HOHIMER, JP HADLEY, GR VAWTER, GA AF HOHIMER, JP HADLEY, GR VAWTER, GA TI SEMICONDUCTOR RING LASERS WITH REFLECTION OUTPUT COUPLERS SO APPLIED PHYSICS LETTERS LA English DT Article ID DIODE-LASERS; OPERATION AB We report circular-cavity semiconductor ring lasers with 45-degrees reflection output couplers that increase the lasing output power and slope efficiency twofold compared to lasers with Y-junction output couplers. These devices emit more than 3.5 mW of cw single-frequency output power at 100 mA ring current with slope efficiencies of 0.07 W/A. The increased output power and reduced spontaneous emission improve single-frequency side-mode rejection by up to 10 dB (to nearly 32 dB). RP HOHIMER, JP (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 11 TC 11 Z9 12 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 JUL 19 PY 1993 VL 63 IS 3 BP 278 EP 280 DI 10.1063/1.110077 PG 3 WC Physics, Applied SC Physics GA LN238 UT WOS:A1993LN23800002 ER PT J AU ZHAO, Y WU, CK SHAH, P KIM, MK DAWSON, LR AF ZHAO, Y WU, CK SHAH, P KIM, MK DAWSON, LR TI OPTICAL-PHASE CONJUGATION IN INGAAS/GAAS MULTIPLE-QUANTUM WELLS AT 1.06 MU-M WAVELENGTH SO APPLIED PHYSICS LETTERS LA English DT Article ID CRITICAL LAYER THICKNESS; EFFECT DEVICE; ELECTROABSORPTION; MODULATORS AB The observation of phase conjugation in InGaAs/GaAs multiple quantum wells at 1.06 mum wavelength is reported on. The effective nonlinearity of the sample used in our experiments was measured to be chi(3) = 10(-7) esu. The nonlinearity is induced by the saturation absorption due to band filling and exciton bleaching. The saturation intensity is 1.3 kW/cm2. C1 WAYNE STATE UNIV,DEPT PHYS & ASTRON,DETROIT,MI 48202. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP ZHAO, Y (reprint author), WAYNE STATE UNIV,DEPT ELECT & COMP ENGN,DETROIT,MI 48202, USA. RI Kim, Myung/L-3575-2014 OI Kim, Myung/0000-0002-2818-8928 NR 18 TC 2 Z9 2 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 19 PY 1993 VL 63 IS 3 BP 281 EP 283 DI 10.1063/1.110078 PG 3 WC Physics, Applied SC Physics GA LN238 UT WOS:A1993LN23800003 ER PT J AU WALTON, JT DERHACOBIAN, N WONG, YK HALLER, EE AF WALTON, JT DERHACOBIAN, N WONG, YK HALLER, EE TI LITHIUM-ION MOBILITY IMPROVEMENT IN FLOATING-ZONE SILICON BY EXTERNAL GETTERING SO APPLIED PHYSICS LETTERS LA English DT Article ID SI(LI) DETECTORS AB Phosphorous diffusion for approximately 1 h at 950-degrees-C is shown to be an effective gettering procedure to remove lithium-ion mobility reducing defects in floating-zone p-type silicon wafers. The removal of these defects, which can severely impede the movement of lithium ions in silicon wafers during lithium-ion compensation process, is crucial in the fabrication of silicon lithium-drifted radiation detectors. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP WALTON, JT (reprint author), LAWRENCE BERKELEY LAB,DEPT ENGN SCI,DIV ENGN,BERKELEY,CA 94720, USA. NR 16 TC 6 Z9 6 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 19 PY 1993 VL 63 IS 3 BP 343 EP 345 DI 10.1063/1.110037 PG 3 WC Physics, Applied SC Physics GA LN238 UT WOS:A1993LN23800024 ER PT J AU KHATRI, R ASOKAKUMAR, P NIELSEN, B ROELLIG, LO LYNN, KG AF KHATRI, R ASOKAKUMAR, P NIELSEN, B ROELLIG, LO LYNN, KG TI POSITRON TRAP CENTERS IN X-RAY AND GAMMA-RAY IRRADIATED SIO2 SO APPLIED PHYSICS LETTERS LA English DT Article ID HYDROGEN AB Using Doppler broadening annihilation spectroscopy, we investigated the properties of irradiated samples of SiO2/Si(100) with 117 nm thick oxide layer, grown in dry O2 on p- and n-type substrates. These samples were irradiated with gamma rays and x rays at doses in the range of 7 X 10(4)-9 X 10(6) rad and 50-2000 Mj/cm2, respectively. The changes observed in the Doppler broadening line shape parameter after irradiation and its recovery during isochronal annealing were used to obtain an activation energy of 1.48-1.61 eV required for annealing the defects. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP KHATRI, R (reprint author), CUNY CITY COLL,DEPT PHYS,NEW YORK,NY 10031, USA. RI Nielsen, Bent/B-7353-2009 OI Nielsen, Bent/0000-0001-7016-0040 NR 14 TC 10 Z9 10 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 19 PY 1993 VL 63 IS 3 BP 385 EP 387 DI 10.1063/1.110051 PG 3 WC Physics, Applied SC Physics GA LN238 UT WOS:A1993LN23800038 ER PT J AU ZHU, S LOWNDES, DH CHAKOUMAKOS, BC BUDAI, JD CHRISTEN, DK ZHENG, XY JONES, E WARMACK, B AF ZHU, S LOWNDES, DH CHAKOUMAKOS, BC BUDAI, JD CHRISTEN, DK ZHENG, XY JONES, E WARMACK, B TI IN-SITU GROWTH OF EPITAXIAL BI2SR2CACU2O8-X AND BI2SR2CUO6-X FILMS BY PULSED-LASER ABLATION SO APPLIED PHYSICS LETTERS LA English DT Article ID BI(PB)-SR-CA-CU-O THIN-FILMS; DEPOSITION; SUPERCONDUCTIVITY AB Pulsed-laser ablation has been used to grow epitaxial films of Bi2Sr2CaCu2O8-x (Bi-2212) and Bi2Sr2CuO6-x (Bi-2201) on (001) MgO with entirely in situ processing., The films' layer-stacking sequence, microstructure, and superconducting T(c) are highly sensitive to the growth temperature and deposition rate. Pure Bi-2212 films exist over only a narrow temperature range. Pure Bi-2201 films appear at higher growth temperature, while lower growth temperature enhances the Bi-2223 phase, though it is mixed with Bi-2212. The phase homogeneity, in-plane connections among grains, and superconducting T(c) of Bi-2212 grown at a given temperature are greatly improved by reducing the deposition rate. Epitaxial Bi-2212 films grown at 740-degrees-C and 0.5 Hz (approximately 0.05 nm/s) have T(c)0 (R=0)=71 K, with J(c) approximately 8 X 10(5) A/cm2 at 50 K and J(c) approximately 5 X 10(6) A/cm2 at 4.2 K. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831. RP ZHU, S (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. RI Chakoumakos, Bryan/A-5601-2016; Budai, John/R-9276-2016 OI Chakoumakos, Bryan/0000-0002-7870-6543; Budai, John/0000-0002-7444-1306 NR 13 TC 22 Z9 27 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 19 PY 1993 VL 63 IS 3 BP 409 EP 411 DI 10.1063/1.110008 PG 3 WC Physics, Applied SC Physics GA LN238 UT WOS:A1993LN23800046 ER PT J AU NEWMAN, N ROSS, J RUBIN, M AF NEWMAN, N ROSS, J RUBIN, M TI THERMODYNAMIC AND KINETIC PROCESSES INVOLVED IN THE GROWTH OF EPITAXIAL GAN THIN-FILMS (VOL 62, PG 1242, 1993) SO APPLIED PHYSICS LETTERS LA English DT Correction, Addition RP NEWMAN, N (reprint author), LAWRENCE BERKELEY LAB,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. RI Newman, Nathan/E-1466-2011 OI Newman, Nathan/0000-0003-2819-9616 NR 1 TC 4 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 19 PY 1993 VL 63 IS 3 BP 424 EP 424 DI 10.1063/1.110818 PG 1 WC Physics, Applied SC Physics GA LN238 UT WOS:A1993LN23800052 ER PT J AU LOONG, CK SODERHOLM, L HAMMONDS, JP ABRAHAM, MM BOATNER, LA EDELSTEIN, NM AF LOONG, CK SODERHOLM, L HAMMONDS, JP ABRAHAM, MM BOATNER, LA EDELSTEIN, NM TI RARE-EARTH ENERGY-LEVELS AND MAGNETIC-PROPERTIES OF HOPO4 AND ERPO4 SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID CRYSTAL-FIELD SPLITTINGS; ELECTRONIC RAMAN-SCATTERING; TRIVALENT HOLMIUM; SPECTRA; PHOSPHATES; HOASO4; Y(OH)3; YBPO4; LUPO4; MODEL AB The static and dynamic magnetic responses of HoPO4 and ErPO4 have been studied by means of neutron spectroscopy and magnetic susceptibility measurements. The inelastic neutron scattering spectra exhibit well-defined transitions characteristic of crystal-field excitations of the rare-earth ions. The data were analysed using a Hamiltonian that included atomic free-ion and crystal-field interactions for an f(N) configuration (N = 10 and 11 for Ho3+ and Er3+, respectively). Using the free-ion parameters derived from optical spectroscopy of the corresponding rare-earth ions diluted in a YPO4 host, crystal-field parameters for both HoPO4 and ErPO4 were obtained. A comparison of the neutron data with optical absorption and both non-resonance and resonance Raman scattering measurements has been made. The derived crystal-field-level structure provides a basis for explaining the low-temperature magnetic properties of both compounds. The calculated and measured paramagnetic susceptibilities agree well for HoPO4 and ErPO4 in the temperature range of 5-300 K. The highly anisotropic, saturated magnetization of the ground doublet in HoPO4 may act as a 'bootstrap' for a long-range magnetic ordering of the moments parallel to the c-axis at low temperatures. The nearly spherically symmetric moments of the low-lying Kramers doublets of ErPO4, however, tend to couple less effectively via exchange interactions. The effective exchange field in antiferromagnetic HoPO4, as estimated based on the crystal-field-level scheme and a molecular-field approximation, is found to be in good agreement with that reported from a specific-heat analysis. The paramagnetic specific heat, spectroscopic splitting g-factors of the low-lying doublet states, and saturated moments for HoPO4 and ErPO4 obtained from the present study are applicable to interpreting specific heat, hyperfine interaction, EPR, and neutron diffraction measurements. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP LOONG, CK (reprint author), ARGONNE NATL LAB,DIV INTENSE PULSED NEUTRON SOURCE & CHEM,ARGONNE,IL 60439, USA. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 54 TC 28 Z9 29 U1 2 U2 12 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 JUL 19 PY 1993 VL 5 IS 29 BP 5121 EP 5140 DI 10.1088/0953-8984/5/29/009 PG 20 WC Physics, Condensed Matter SC Physics GA LN952 UT WOS:A1993LN95200009 ER PT J AU HOFF, SM NOVAK, BM AF HOFF, SM NOVAK, BM TI COMPLEX ARCHITECTURES THROUGH LIVING POLYMERIZATIONS - THE SYNTHESIS OF ONCE-BROKEN WORMS AND TRIBLOCK COPOLYMERS USING BIMETALLIC INITIATORS SO MACROMOLECULES LA English DT Article ID RING-OPENING POLYMERIZATION; OPTICALLY-ACTIVE POLYISOCYANATES; COORDINATION POLYMERIZATION; MACROMOLECULAR STEREOCHEMISTRY; ALKYLIDENE COMPLEXES; BLOCK COPOLYMERS; ROD; ISOCYANATE); NORBORNENE; PROPENE C1 LAWRENCE BERKELEY LAB, CTR ADV MAT, DIV MAT SCI, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. NR 58 TC 39 Z9 39 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JUL 19 PY 1993 VL 26 IS 15 BP 4067 EP 4069 DI 10.1021/ma00067a056 PG 3 WC Polymer Science SC Polymer Science GA LN821 UT WOS:A1993LN82100056 ER PT J AU SAFIR, AL NOVAK, BM AF SAFIR, AL NOVAK, BM TI AIR-STABLE AND WATER-STABLE 1,2-VINYL-INSERTION POLYMERIZATIONS OF BICYCLIC OLEFINS - A SIMPLE PRECURSOR ROUTE TO POLYACETYLENE SO MACROMOLECULES LA English DT Article ID POLY(ACETYLENE) C1 UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, CTR ADV MAT, DIV MAT SCI, BERKELEY, CA 94720 USA. NR 16 TC 29 Z9 29 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JUL 19 PY 1993 VL 26 IS 15 BP 4072 EP 4073 DI 10.1021/ma00067a058 PG 2 WC Polymer Science SC Polymer Science GA LN821 UT WOS:A1993LN82100058 ER PT J AU BARDAKCI, K AF BARDAKCI, K TI A CANDIDATE FOR THE QCD STRING BASED ON NON-BACKTRACKING RANDOM-WALK SO NUCLEAR PHYSICS B LA English DT Article ID MULTICOLOR QCD AB A new string theory is proposed as a candidate for the large N limit of QCD. In this theory, strings are constrained to be non-backtracking; a condition that is essential for the gauge invariance of the underlying field theory. This condition is implemented by first placing the theory on a lattice and then introducing fermionic variables on the world sheet. The naive continuum limit leads to a generalized Thirring model on the world sheet, and it is suggested that the application of the renormalization group should drive the coupling constants to a conformally invariant fixed point. C1 LAWRENCE BERKELEY LAB, DIV PHYS, THEORET PHYS GRP, BERKELEY, CA 94720 USA. RP UNIV CALIF DAVIS, DEPT PHYS, DAVIS, CA 95616 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 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL 19 PY 1993 VL 401 IS 1-2 BP 168 EP 189 DI 10.1016/0550-3213(93)90301-5 PG 22 WC Physics, Particles & Fields SC Physics GA LN298 UT WOS:A1993LN29800005 ER PT J AU KRONFELD, AS WIESE, UJ AF KRONFELD, AS WIESE, UJ TI SU(N) GAUGE-THEORIES WITH C-PERIODIC BOUNDARY-CONDITIONS .2. SMALL-VOLUME DYNAMICS SO NUCLEAR PHYSICS B LA English DT Article ID WEAK-COUPLING EXPANSION; LYING ENERGY VALUES; MASS-SPECTRUM; FINITE VOLUME; TORUS; TEMPERATURE; GLUEBALL; FLUX AB The dynamics of SU(N) gauge theories, especially for N = 3, in a small C-periodic box are investigated. We identify the fields that mimimize the energy - the torons - and determine which of these ''classical'' vacua are stable quantum mechanically. The stable torons break cubic symmetry, which has interesting consequences on the spectrum. At any of the stable torons there are also quartic modes. Since all C-periodic boundary conditions are gauge-equivalent, we choose a convenient version, for which the quartic modes are constant modes, and compute the effective hamiltonian to one loop in perturbation theory. C1 UNIV BERN,CH-3012 BERN,SWITZERLAND. RP KRONFELD, AS (reprint author), FERMILAB NATL ACCELERATOR LAB,THEORET PHYS GRP,POB 500,BATAVIA,IL 60510, USA. NR 15 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL 19 PY 1993 VL 401 IS 1-2 BP 190 EP 205 DI 10.1016/0550-3213(93)90302-6 PG 16 WC Physics, Particles & Fields SC Physics GA LN298 UT WOS:A1993LN29800006 ER PT J AU VO, DT KELLY, WH WOHN, FK HILL, JC DELEPLANQUE, MA DIAMOND, RM STEPHENS, FS OLIVEIRA, JRB BURDE, J MACCHIAVELLI, AO DEBOER, J CEDERWALL, B LEE, IY FALLON, P BECKER, JA HENRY, EA BRINKMAN, MJ KUHNERT, A STOYER, MA HUGHES, JR DRAPER, JE DUYAR, C RUBEL, E AF VO, DT KELLY, WH WOHN, FK HILL, JC DELEPLANQUE, MA DIAMOND, RM STEPHENS, FS OLIVEIRA, JRB BURDE, J MACCHIAVELLI, AO DEBOER, J CEDERWALL, B LEE, IY FALLON, P BECKER, JA HENRY, EA BRINKMAN, MJ KUHNERT, A STOYER, MA HUGHES, JR DRAPER, JE DUYAR, C RUBEL, E TI SUPERDEFORMATION IN AU-191 SO PHYSICAL REVIEW LETTERS LA English DT Article ID NUCLEI; PSEUDOSPIN; HG-191; BANDS AB A superdeformed band has been observed for the first time in an Au isotope. The reaction used was B-11 + W-186, demonstrating that very light ions can be used to populate superdeformed (SD) bands at high angular momentum. The band is assigned to 191Au. The gamma-ray energies are at the quarter-point energies of the 192Hg SD band, indicating that it is ''identical'' to that of 192Hg. C1 LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV SAO PAULO,SAO PAULO,BRAZIL. HEBREW UNIV JERUSALEM,RACAH INST PHYS,JERUSALEM,ISRAEL. COMIS NACL ENERGIA ATOM,RA-1429 BUENOS AIRES,DF,ARGENTINA. UNIV MUNICH,W-8000 MUNICH 2,GERMANY. CALTECH,PASADENA,CA 91125. RP VO, DT (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011, USA. RI Oliveira, Jose Roberto/J-3124-2012; Cederwall, Bo/M-3337-2014 OI Oliveira, Jose Roberto/0000-0003-1362-7382; Cederwall, Bo/0000-0003-1771-2656 NR 16 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 JUL 19 PY 1993 VL 71 IS 3 BP 340 EP 343 DI 10.1103/PhysRevLett.71.340 PG 4 WC Physics, Multidisciplinary SC Physics GA LN185 UT WOS:A1993LN18500009 ER PT J AU KRAUSE, HF DATZ, S DITTNER, PF JONES, NL VANE, CR AF KRAUSE, HF DATZ, S DITTNER, PF JONES, NL VANE, CR TI INTERFERENCES IN RESONANT EXCITATION OF HYDROGENIC CHANNELED IONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID COHERENT EXCITATION AB We have observed selection rules for the resonant excitation of swift hydrogenlike ions (Z = 6,7) axially channeled in the [111] direction of a diamond lattice (silicon). The resonant excitation arises from a coherent periodic perturbation by the atoms in the bounding crystal rows. We show that the selection rules are the consequence of destructive and constructive interference in the quantum mechanical transition amplitude for excitation. RP KRAUSE, HF (reprint author), OAK RIDGE NATL LAB,DIV PHYS,POB 2008,OAK RIDGE,TN 37831, USA. 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 JUL 19 PY 1993 VL 71 IS 3 BP 348 EP 351 DI 10.1103/PhysRevLett.71.348 PG 4 WC Physics, Multidisciplinary SC Physics GA LN185 UT WOS:A1993LN18500011 ER PT J AU ANDERS, A ANDERS, S GUNDERSEN, MA AF ANDERS, A ANDERS, S GUNDERSEN, MA TI MODEL FOR EXPLOSIVE ELECTRON-EMISSION IN A PSEUDOSPARK SUPERDENSE GLOW SO PHYSICAL REVIEW LETTERS LA English DT Article ID ARC CATHODE EROSION; ATMOSPHERIC-PRESSURE; SIMULATION; DISCHARGE; THYRATRON; VACUUM AB The pseudospark cathode has the remarkable property of macroscopically homogeneous electron emission at very high current density (> 1 kA/cm2) over a large area (some cm2). Experimental results and the model presented here provide evidence that the pseudospark microscopically utilizes explosive arc processes, as distinct from the earlier model [Phys. Rev. Lett. 60, 2371 (1988)]. C1 UNIV SO CALIF,DEPT ELECT ENGN,LOS ANGELES,CA 90089. RP ANDERS, A (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Anders, Andre/B-8580-2009; Raoux, Simone/G-3920-2016 OI Anders, Andre/0000-0002-5313-6505; NR 23 TC 29 Z9 29 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 19 PY 1993 VL 71 IS 3 BP 364 EP 367 DI 10.1103/PhysRevLett.71.364 PG 4 WC Physics, Multidisciplinary SC Physics GA LN185 UT WOS:A1993LN18500015 ER PT J AU VILLENEUVE, DM BAKER, KL DRAKE, RP SLEAFORD, B LAFONTAINE, B ESTABROOK, K PRASAD, MK AF VILLENEUVE, DM BAKER, KL DRAKE, RP SLEAFORD, B LAFONTAINE, B ESTABROOK, K PRASAD, MK TI OBSERVATION OF PLASMA-WAVES BY THOMSON SCATTERING - SATURATION OF STIMULATED RAMAN-SCATTERING SO PHYSICAL REVIEW LETTERS LA English DT Article ID LASER-PRODUCED PLASMA; BRILLOUIN-SCATTERING; COMPETITION; BEHAVIOR; LANGMUIR; SPECTRA; DECAY AB Thomson scattering was used to probe the frequency and wave-number spectra of plasma waves driven in a plasma by stimulated Raman scattering (SRS). SRS was excited in exploding foil targets with a 1.06 mum wavelength laser with average intensities up to 10(15) W/cm2. The spectra show that the plasma waves are consistent with the linear SRS dispersion relation. Observed broadening of the spectrum towards smaller wave number is consistent with saturation of SRS by Langmuir decay for these conditions. C1 UNIV CALIF DAVIS,PLASMA PHYS RES INST,DAVIS,CA 95616. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. INST NATL RECH SCI ENERGIE VARENNES,VARENNES J3X 1S2,PQ,CANADA. RP VILLENEUVE, DM (reprint author), NATL RES COUNCIL CANADA,OTTAWA K1A 0R6,ONTARIO,CANADA. RI Villeneuve, David/I-4140-2012; Drake, R Paul/I-9218-2012 OI Villeneuve, David/0000-0002-2810-3648; Drake, R Paul/0000-0002-5450-9844 NR 21 TC 20 Z9 20 U1 2 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 JUL 19 PY 1993 VL 71 IS 3 BP 368 EP 371 DI 10.1103/PhysRevLett.71.368 PG 4 WC Physics, Multidisciplinary SC Physics GA LN185 UT WOS:A1993LN18500016 ER PT J AU CHARALAMBOUS, M CHAUSSY, J LEJAY, P VINOKUR, V AF CHARALAMBOUS, M CHAUSSY, J LEJAY, P VINOKUR, V TI SUPERHEATING OF THE ABRIKOSOV FLUX LATTICE SO PHYSICAL REVIEW LETTERS LA English DT Article ID II SUPERCONDUCTORS; SURFACE; DEPENDENCE; ALUMINUM AB We report on thermal cycling of an YBa2Cu3O7 single crystal close to the melting temperature of the flux lattice for H(parallel-to)ab. Transport current is along the c axis and the temperature stability is better than 1 mK. The melting (freezing) transition of the flux lattice occurs at different temperatures (DELTAT = 7 mK) between the cooling and the heating cycle. Hysteresis disappears for slightly increased current density (0.1 A/cm2). Comparison of thermal cycles reveals that the Abrikosov lattice superheats, in contrast with the usual behavior in real crystals where surface premelting is important. This can be due to its imbedding in the real crystal and the consequent surface pinning. C1 IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP CHARALAMBOUS, M (reprint author), CNRS,CTR RECH TRES BASSES TEMP,BP 166,F-38042 GRENOBLE 9,FRANCE. NR 28 TC 81 Z9 81 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 19 PY 1993 VL 71 IS 3 BP 436 EP 439 DI 10.1103/PhysRevLett.71.436 PG 4 WC Physics, Multidisciplinary SC Physics GA LN185 UT WOS:A1993LN18500033 ER PT J AU HAMMEL, PC REYES, AP CHEONG, SW FISK, Z SCHIRBER, JE AF HAMMEL, PC REYES, AP CHEONG, SW FISK, Z SCHIRBER, JE TI NMR-STUDY OF LOCAL-STRUCTURE IN METALLIC LA2CUO4+ DELTA SO PHYSICAL REVIEW LETTERS LA English DT Article ID SUPERCONDUCTING LA2CUO4+DELTA; CRYSTAL-STRUCTURE; PHASE-SEPARATION; NQR; LA2-XSRXCUO4; SUPEROXIDE; LA-139 AB We employ La-139 NMR spectroscopy as a structural probe of metallic La2CuO4+delta. We find a distribution of lateral displacements of the oxygen atoms which form the apices of the oxygen octahedra. We directly observe a wide distribution of structures of the La-O layer; this distribution is strongly temperature dependent. We present copper NQR spectra which reveal a second, unexplained, copper site in the CuO2 planes. We show that these features are not manifestations of disturbances of the lattice by interstitial dopants, but are the intrinsic response of La2CuO4+delta to doped holes. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP HAMMEL, PC (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Hammel, P Chris/O-4845-2014 OI Hammel, P Chris/0000-0002-4138-4798 NR 30 TC 88 Z9 88 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 JUL 19 PY 1993 VL 71 IS 3 BP 440 EP 443 DI 10.1103/PhysRevLett.71.440 PG 4 WC Physics, Multidisciplinary SC Physics GA LN185 UT WOS:A1993LN18500034 ER PT J AU WOLF, D AF WOLF, D TI SHOULD ALL SURFACES BE RECONSTRUCTED - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Note RP WOLF, D (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 9 TC 3 Z9 3 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 19 PY 1993 VL 71 IS 3 BP 462 EP 463 DI 10.1103/PhysRevLett.71.462 PG 2 WC Physics, Multidisciplinary SC Physics GA LN185 UT WOS:A1993LN18500041 ER PT J AU COOK, DR KAUFMAN, AN BRIZARD, AJ YE, HC TRACY, ER AF COOK, DR KAUFMAN, AN BRIZARD, AJ YE, HC TRACY, ER TI 2-DIMENSIONAL REFLECTION OF MAGNETOSONIC RADIATION BY GYROBALLISTIC WAVES - AN ANALYTIC THEORY SO PHYSICS LETTERS A LA English DT Article ID GEOMETRIC OPTICS; REDUCTION AB For the first time, the three-step process (conversion-propagation-conversion) underlying gyroresonant reflection is analytically developed for two-dimensional geometry. Phase-space methods are used for the conversion of an incident magnetosonic wave field to a continuum of gyroballistic waves, for their propagation along guiding-center orbits in the poloidal plane of a tokamak, and for their conversion to the two-dimensional magnetosonic reflection field. The wave fronts and amplitude of that field are obtained explicitly. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP COOK, DR (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. OI Brizard, Alain/0000-0002-0192-6273 NR 20 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD JUL 19 PY 1993 VL 178 IS 5-6 BP 413 EP 418 DI 10.1016/0375-9601(93)90870-6 PG 6 WC Physics, Multidisciplinary SC Physics GA LN335 UT WOS:A1993LN33500014 ER PT J AU COHEN, ML AF COHEN, ML TI PREDICTING USEFUL MATERIALS SO SCIENCE LA English DT Editorial Material ID SOLIDS C1 LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. RP UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. NR 10 TC 151 Z9 154 U1 1 U2 11 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 EI 1095-9203 J9 SCIENCE JI Science PD JUL 16 PY 1993 VL 261 IS 5119 BP 307 EP 308 DI 10.1126/science.261.5119.307 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM678 UT WOS:A1993LM67800023 PM 17836841 ER PT J AU GEISER, U KINI, AM AF GEISER, U KINI, AM TI STRUCTURE OF THE TRIGONAL PHASE OF BIS(METHINYLTRICOBALTENNEACARBONYL), [CCO3(CO)9]2 SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article AB A second, trigonal, phase of [CCo3(CO)9]2, mu6-dicarbide-1:2:3kappa3C1;4:5:6kappa3C2-hexakis(tricarbonylcobalt)-(6 Co-Co), has been found, in addition to the monoclinic one reported earlier [Brice & Penfold (1972). Inorg. Chem. 11, 1381-1384]. The intermolecular geometry of the molecule in the two crystallographic modifications is virtually the same. The two Co3 triangles are twisted by ca 28-degrees with respect to each other, indicating a conformation between staggered and eclipsed. Optically active crystals of the trigonal phase form by spontaneous resolution of the enantiomorphic conformers. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP GEISER, U (reprint author), ARGONNE NATL LAB,DIV CHEM,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Kini, Aravinda/F-4467-2012 NR 5 TC 13 Z9 13 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD JUL 15 PY 1993 VL 49 BP 1322 EP 1324 DI 10.1107/S010827019300085X PN 7 PG 3 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA LV129 UT WOS:A1993LV12900030 ER PT J AU BURNS, JH HAGAMAN, EW AF BURNS, JH HAGAMAN, EW TI 3 MONOFLUORINATED SMALL MOLECULES - ORTHO-FLUOROPHENYLGLYCINE, METHYL 4-(FLUOROCARBONYL)BENZOATE AND 16-ALPHA-FLUORO-ALPHA-ESTRADIOL 3-METHYL ETHER SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article AB 2-Amino-2-(2-fluorophenyl)acetic acid (ortho-fluorophenylglycine) consists of a planar acetate anion with a fluorophenyl group attached to the alpha C atom at a dihedral angle of 105.5-degrees. All three amino H atoms form hydrogen bonds to carboxylate O atoms of three adjacent molecules in the crystal. Methyl 4-(fluorocarbonyl)benzoate has a planar phenylfluorocarbonyl group and its planar carboxylate group is rotated by 6-degrees from it. The estradiol 3-methyl ether, 16alpha-fluoro-3-methoxyestra-1,3,5(10)-trien-17alpha-ol, has the well known structure for the estradiol moiety. The alcoholic H atom is hydrogen bonded to the adjacent F atom of the molecule. There are no intermolecular hydrogen bonds. RP BURNS, JH (reprint author), OAK RIDGE NATL LAB,DIV CHEM,POB 2008,OAK RIDGE,TN 37831, USA. NR 16 TC 9 Z9 9 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD JUL 15 PY 1993 VL 49 BP 1393 EP 1396 DI 10.1107/S0108270193000605 PN 7 PG 4 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA LV129 UT WOS:A1993LV12900058 ER PT J AU GARCIA, JG ENAS, JD CHANG, EC FRONCZEK, FR AF GARCIA, JG ENAS, JD CHANG, EC FRONCZEK, FR TI STRUCTURE OF 2-ETHYL-2-NITROINDAN-1,3-DIONE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article AB The indan-1,3-dione system is slightly non-planar, with the tetrahedral C atom lying 0.149 (2) angstrom out of the best plane of the other eight C and two O atoms. The terminal C atom of the ethyl group is directed anti to the nitro group and gauche to the carbonyl C atoms, forming C-C-C-C torsion angles of 53.3 (2) and -64.3 (2)-degrees. The nitro group is nearly coplanar with the ethyl substituent, forming an O-N-C-C torsion angle of 175.9 (2)-degrees. The C=O distances are 1.194 (2) and 1.204 (2) angstrom. C1 LOUISIANA STATE UNIV,DEPT CHEM,BATON ROUGE,LA 70803. RP GARCIA, JG (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 9 TC 4 Z9 4 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD JUL 15 PY 1993 VL 49 BP 1401 EP 1402 DI 10.1107/S0108270193000976 PN 7 PG 2 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA LV129 UT WOS:A1993LV12900061 ER PT J AU MATALKA, KZ BAILEY, MQ BARTH, RF STAUBUS, AE SOLOWAY, AH MOESCHBERGER, ML CODERRE, JA ROFSTAD, EK AF MATALKA, KZ BAILEY, MQ BARTH, RF STAUBUS, AE SOLOWAY, AH MOESCHBERGER, ML CODERRE, JA ROFSTAD, EK TI BORON NEUTRON-CAPTURE THERAPY OF INTRACEREBRAL MELANOMA USING BORONOPHENYLALANINE AS A CAPTURE AGENT SO CANCER RESEARCH LA English DT Article ID MALIGNANT-MELANOMA; MURINE MELANOMA; BRAIN; CELLS; IRRADIATION; METASTASES; TOXICITY; DELIVERY; MICE AB A rat brain tumor model has been developed utilizing nude rats and the human melanoma cell line MRA 27. For pharmacokinetic and tissue distribution studies, 2 10(5) MRA 27 cells were implanted intracerebrally (i.c.), and 30 days later, 120 mg of B-10-enriched L-boronophenylalanine were injected i.p. into nude rats. B-10 concentrations in the tumor, blood, and normal brain were 23.7, 9.4, and 8.4 mug/g, respectively, 6 h following administration. For therapy experiments, tumor bearing rats were irradiated at the Brookhaven Medical Research Reactor 30 days following implantation. The median survival time was 44 days for untreated rats, 76 days for those receiving a physical dose of 2.7 Gy, and 93 days for those receiving 3.6 Gy. Animals receiving both B-10-L-boronophenylalanine and physical doses of 1.8, 2.7, or 3.6 Gy (total tumor physical doses of 5.0, 7.5, or 10.1 Gy) had median survival times of 170, 182, and 262 days, respectively. Forty % of rats that received the highest tumor dose (10.1 Gy) survived >300 days. In a replicate experiment 21% of animals that had received L-boronophenylalanine and irradiation (total tumor physical dose of 10.1 Gy) were alive 220 days after therapy. In a parallel study, animals that were irradiated with gamma photons from a Cs-137 source with 12 Gy or 2.0 Gy 9 delivered to the head had median survival times of 86 and 79 days, respectively, compared to 47 days for untreated animals. Our results indicate that boron neutron capture therapy is effective against i.c. melanoma in a rodent model and suggest that large animal studies are warranted to further assess its efficacy. C1 OHIO STATE UNIV,DEPT PATHOL,165 HAMILTON HALL,1645 NEIL AVE,COLUMBUS,OH 43210. OHIO STATE UNIV,DEPT VET CLIN SCI,COLUMBUS,OH 43210. OHIO STATE UNIV,DEPT PREVENT MED,COLUMBUS,OH 43210. OHIO STATE UNIV,COLL PHARM,COLUMBUS,OH 43210. BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. NORWEGIAN RADIUM HOSP,OSLO 3,NORWAY. NR 33 TC 34 Z9 34 U1 0 U2 0 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD JUL 15 PY 1993 VL 53 IS 14 BP 3308 EP 3313 PG 6 WC Oncology SC Oncology GA LM677 UT WOS:A1993LM67700020 PM 8324742 ER PT J AU BAIN, JA CLEMENS, BM NOTARYS, H MARINERO, EE BRENNAN, S AF BAIN, JA CLEMENS, BM NOTARYS, H MARINERO, EE BRENNAN, S TI X-RAY-ANALYSIS OF COMPOSITIONAL MODULATION IN CO/PT MULTILAYER FILMS FOR MAGNETOOPTIC RECORDING SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID THICKNESS DEPENDENCE; ANISOTROPY AB The compositional modulation in Co/Pt multilayer films was studied through the use of asymmetric Bragg diffraction. The angle between the scattering vector and the surface normal was varied in order to interrogate different components of the in-plane strain. In-plane strain values and unstrained lattice parameters, which reveal the intermixing of the two metals, were extracted from these measurements. The films displayed strains which varied with bilayer period and showed substantial intermixing at the smaller bilayer periods. These small bilayer period films showed perpendicular anisotropy as measured by Kerr rotation. C1 IBM CORP,ALMADEN RES CTR,SAN JOSE,CA 95120. STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94305. RP BAIN, JA (reprint author), STANFORD UNIV,DEPT MAT SCI,STANFORD,CA 94305, USA. OI Bain, James/0000-0002-5355-5048 NR 15 TC 5 Z9 5 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUL 15 PY 1993 VL 74 IS 2 BP 996 EP 1000 DI 10.1063/1.354843 PG 5 WC Physics, Applied SC Physics GA LM782 UT WOS:A1993LM78200037 ER PT J AU PAN, LS HAN, S KANIA, DR ZHAO, S GAN, KK KAGAN, H KASS, R MALCHOW, R MORROW, F PALMER, WF WHITE, C KIM, SK SANNES, F SCHNETZER, S STONE, R THOMSON, GB SUGIMOTO, Y FRY, A KANDA, S OLSEN, S FRANKLIN, M AGER, JW PIANETTA, P AF PAN, LS HAN, S KANIA, DR ZHAO, S GAN, KK KAGAN, H KASS, R MALCHOW, R MORROW, F PALMER, WF WHITE, C KIM, SK SANNES, F SCHNETZER, S STONE, R THOMSON, GB SUGIMOTO, Y FRY, A KANDA, S OLSEN, S FRANKLIN, M AGER, JW PIANETTA, P TI PARTICLE-INDUCED AND PHOTOINDUCED CONDUCTIVITY IN TYPE-IIA DIAMONDS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID NATURAL DIAMOND; RADIATION DETECTORS; LATTICE SCATTERING AB Electrical characteristics associated with radiation detection were measured on single-crystal natural type-IIa diamond using two techniques: charged particle-induced conductivity and time-resolved transient photoinduced conductivity. The two techniques complement each other: The charged particle-induced conductivity technique measures the product of the carrier mobility mu and lifetime tau throughout the bulk of the material while the transient photoconductivity technique measures the carrier mobility and lifetime independently at the first few micrometers of the material surface. For each technique, the mutau product was determined by integration of the respective signals. The collection distance that a free carrier drifts in an electric field was extracted by each technique. As a result, a direct comparison of bulk and surface electrical properties was performed. The data from these two techniques are in agreement, indicating no difference in the electrical properties between the bulk and the surface of the material. The collection distance continues to increase with field up to 25 kV/cm without saturation. Using the transient photoconductivity technique the carrier mobility was measured separately and compared with a simple electron-phonon scattering model. The general characteristics of carrier mobility, lifetime, and collection distance at low electric field appear to be adequately described by the model. C1 OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210. RUTGERS UNIV,DEPT PHYS & ASTRON,PISCATAWAY,NJ 08854. KEK LAB,TSUKUBA,IBARAKI 305,JAPAN. SSC LAB,DIV PHYS,DALLAS,TX 75237. UNIV ROCHESTER,DEPT PHYS,ROCHESTER,NY 14627. HARVARD UNIV,DEPT PHYS,CAMBRIDGE,MA 02138. LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. SLAC,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. RP PAN, LS (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV LASER,L-476,LIVERMORE,CA 94550, USA. RI Kim, Sun Kee/G-2042-2015; OI Kim, Sun Kee/0000-0002-0013-0775; Ager, Joel/0000-0001-9334-9751 NR 35 TC 59 Z9 62 U1 3 U2 11 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 JUL 15 PY 1993 VL 74 IS 2 BP 1086 EP 1095 DI 10.1063/1.354957 PG 10 WC Physics, Applied SC Physics GA LM782 UT WOS:A1993LM78200051 ER PT J AU WILLIAMSON, RL RABIN, BH DRAKE, JT AF WILLIAMSON, RL RABIN, BH DRAKE, JT TI FINITE-ELEMENT ANALYSIS OF THERMAL RESIDUAL-STRESSES AT GRADED CERAMIC-METAL INTERFACES .1. MODEL DESCRIPTION AND GEOMETRICAL EFFECTS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID COATINGS; JOINTS AB An elastic-plastic finite element method numerical model has been formulated to study residual stresses developed at graded ceramic-metal interfaces during cooling. The results were compared with those obtained for sharp (nongraded) interfaces to assess the potential for achieving residual stress reductions. Analyses were conducted for various axisymmetric cylindrical specimen geometries relevant to structural joining, coating, and thick film applications. The graded microstructure was treated as a series of perfectly bonded layers, each having slightly different properties. Constitutive relations for the interlayers were estimated using a modified rule-of-mixtures approximation, and strain and stress distributions were calculated for simulated cooling from an assumed fabrication temperature. The results demonstrate the importance of accounting for plasticity when comparing graded and nongraded interfaces. Significant geometrical effects on peak stresses were observed in the graded materials. It is shown that in some cases, optimization of the microstructure is required to achieve reductions in certain critical stress components believed to be important for controlling interface failure. RP WILLIAMSON, RL (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. OI Williamson, Richard/0000-0001-7734-3632 NR 23 TC 180 Z9 190 U1 0 U2 28 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 JUL 15 PY 1993 VL 74 IS 2 BP 1310 EP 1320 DI 10.1063/1.354910 PG 11 WC Physics, Applied SC Physics GA LM782 UT WOS:A1993LM78200085 ER PT J AU DRAKE, JT WILLIAMSON, RL RABIN, BH AF DRAKE, JT WILLIAMSON, RL RABIN, BH TI FINITE-ELEMENT ANALYSIS OF THERMAL RESIDUAL-STRESSES AT GRADED CERAMIC-METAL INTERFACES .2. INTERFACE OPTIMIZATION FOR RESIDUAL-STRESS REDUCTION SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB An elastic-plastic finite element method numerical model previously developed (see Part I of this article) for predicting thermal residual stresses at graded ceramic-metal interfaces has been applied to determine interface conditions favorable for achieving residual stress reductions. Using Al2O3-Ni as a model system, and for a fixed specimen geometry, a study was performed to investigate the effects of different interlayer thicknesses and nonlinear composition profiles on strain and stress distributions established during cooling from an assumed elevated bonding temperature. For each interface condition, relative stress reductions were evaluated by comparing the magnitude of specific stress and strain components important for controlling interface failure with those predicted for a sharp (nongraded) interface. For the geometry considered, stress was reduced by thick graded interlayers and nonlinear composition profiles that distributed the largest property changes over the interlayer region having low elastic modulus and high plasticity. In contrast to the Part I results for a linear composition profile, the optimized interlayer condition effectively reduced the peak near-surface axial stress component. RP DRAKE, JT (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 8 TC 104 Z9 109 U1 0 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUL 15 PY 1993 VL 74 IS 2 BP 1321 EP 1326 DI 10.1063/1.354911 PG 6 WC Physics, Applied SC Physics GA LM782 UT WOS:A1993LM78200086 ER PT J AU HERNANDEZ, R MILLER, WH MOORE, CB POLIK, WF AF HERNANDEZ, R MILLER, WH MOORE, CB POLIK, WF TI A RANDOM-MATRIX TRANSITION-STATE THEORY FOR THE PROBABILITY-DISTRIBUTION OF STATE-SPECIFIC UNIMOLECULAR DECAY-RATES - GENERALIZATION TO INCLUDE TOTAL ANGULAR-MOMENTUM CONSERVATION AND OTHER DYNAMICAL SYMMETRIES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID DISSOCIATION THRESHOLD; POLYATOMIC-MOLECULES; ABINITIO CALCULATION; S0 FORMALDEHYDE; RATE CONSTANTS; REACTION-PATH; FORCE-FIELDS; FLUCTUATIONS; SPECTROSCOPY; DEPENDENCE AB A previously developed random matrix/transition state theory (RM/TST) model for the probability distribution of state-specific unimolecular decay rates has been generalized to incorporate total angular momentum conservation and other dynamical symmetries. The model is made into a predictive theory by using a semiclassical method to determine the transmission probabilities of a nonseparable rovibrational Hamiltonian at the transition state. The overall theory gives a good description of the state-specific rates for the D2CO --> D2 + CO unimolecular decay; in particular, it describes the dependence of the distribution of rates on total angular momentum J. Comparison of the experimental values with results of the RM/TST theory suggests that there is mixing among the rovibrational states. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. HOPE COLL,DEPT CHEM,HOLLAND,MI 49423. RP HERNANDEZ, R (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. RI Hernandez, Rigoberto/A-8793-2008 OI Hernandez, Rigoberto/0000-0001-8526-7414 NR 38 TC 55 Z9 55 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 JUL 15 PY 1993 VL 99 IS 2 BP 950 EP 962 DI 10.1063/1.465360 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LM894 UT WOS:A1993LM89400021 ER PT J AU TANG, J WANG, Z NORRIS, JR AF TANG, J WANG, Z NORRIS, JR TI THE GENERAL TREATMENT OF SUPEREXCHANGE VERSUS SEQUENTIAL ELECTRON-TRANSFER IN A 3-COMPONENT SYSTEM SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID PRIMARY CHARGE-SEPARATION; SPHAEROIDES REACTION CENTERS; NONSUPEREXCHANGE COHERENT MECHANISM; PHOTOSYNTHETIC REACTION CENTERS; BACTERIAL REACTION CENTERS; DYNAMICS; PICOSECOND; SPECTROSCOPY; KINETICS; FRICTION AB The mechanisms of superexchange vs sequential electron transfer in a three-component system involving reactant, intermediate, and product are investigated by using the Zusman equation. This approach is nonperturbative with regard to the electronic coupling and thus, in principle, the contributions from all higher order terms are included. This treatment allows examination of a wide range of conditions from nondegenerate to degenerate cases, as well as from nonadiabatic to adiabatic cases for electron transfer processes involving three Marcus parabolas such as believed to occur in photosynthetic reaction centers. New effects of superexchange on electron-transfer rate resulting from degenerate energy-level crossings are predicted. C1 UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637. RP TANG, J (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. RI Tang, Jau/D-8382-2012 OI Tang, Jau/0000-0003-2078-1513 NR 53 TC 24 Z9 24 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUL 15 PY 1993 VL 99 IS 2 BP 979 EP 984 DI 10.1063/1.465311 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LM894 UT WOS:A1993LM89400024 ER PT J AU HUANG, YH KOURI, DJ ARNOLD, M MARCHIORO, TL HOFFMAN, DK AF HUANG, YH KOURI, DJ ARNOLD, M MARCHIORO, TL HOFFMAN, DK TI DISTRIBUTED APPROXIMATING FUNCTION-APPROACH TO TIME-DEPENDENT WAVE-PACKET PROPAGATION IN MORE THAN ONE-DIMENSION - INELASTIC COLLINEAR ATOM DIATOM COLLISIONS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID SCHRODINGER-EQUATION; DYNAMICS; SURFACE AB The distributed approximating function (DAF) approach to time-dependent wave-packet propagation in the coordinate representation is utilized to treat collinear, inelastic atom-diatom collisions. The resulting discretized DAF (DDAF) 2D-propagator is highly banded, leading to an extremely efficient computational strategy. The approach is illustrated with application to the atom-harmonic oscillator collision system treated earlier by Secrest and Johnson [J. Chem. Phys. 45, 4556 (1966)]. C1 UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP HUANG, YH (reprint author), UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204, USA. NR 22 TC 22 Z9 22 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUL 15 PY 1993 VL 99 IS 2 BP 1028 EP 1034 DI 10.1063/1.465402 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LM894 UT WOS:A1993LM89400028 ER PT J AU HOFFMAN, DK ARNOLD, M ZHU, W KOURI, DJ AF HOFFMAN, DK ARNOLD, M ZHU, W KOURI, DJ TI INTERACTING DISTRIBUTED APPROXIMATING FUNCTIONS FOR REAL-TIME QUANTUM DYNAMICS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID FEYNMAN PATH INTEGRATION; MONTE-CARLO EVALUATION; PROPAGATOR; SYSTEMS AB The distributed approximating function (DAF) approach to quantum real-time dynamics is generalized to include the effects of the potential. The ''interacting'' DAF (IDAF) is introduced as the identity for a certain class of functions that can be chosen to approximate as closely as desired any wave packet of interest. Free propagation of the IDAF yields the free propagator for the IDAF class in the coordinate representation, and substitution of this result into the Trotter form for the short-time full propagator, G(xx'\tau), yields the IDAF class full propagator, G(x,x';{p}\r), in the coordinate representation. Here {p} denotes the set of parameters that determine the IDAF class. The IDAF class full propagator can be used to develop discretized path integral-based algorithms for real-time quantum dynamics. Use of G(xx';{p}\tau) in the Feynman path integral formalism leads to a new result with interesting features compared to the standard path integral. Specifically, the IDAF class full propagator incorporates the classical force, and (1) automatically biases the dynamics toward the neighborhood of classical trajectories (but without relying on destructive and constructive interferences in that no recourse is made to stationary phase arguments), (2) automatically concentrates the wave packet in highly classical regions and attenuates the wave packet in highly nonclassical regions. Of the many possible IDAF-based algorithms two are presented as examples. One illustrates a Monte Carlo approach and the other a discretized matrix multiplication approach. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204. UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. RP HOFFMAN, DK (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 22 TC 14 Z9 14 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUL 15 PY 1993 VL 99 IS 2 BP 1124 EP 1134 DI 10.1063/1.465410 PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LM894 UT WOS:A1993LM89400037 ER PT J AU BARTELT, MC EVANS, JW GLASSER, ML AF BARTELT, MC EVANS, JW GLASSER, ML TI THE CAR-PARKING LIMIT OF RANDOM SEQUENTIAL ADSORPTION - EXPANSIONS IN ONE-DIMENSION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Note C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT MATH,AMES,IA 50011. CLARKSON UNIV,DEPT PHYS,POTSDAM,NY 13699. CLARKSON UNIV,DEPT MATH & COMP SCI,POTSDAM,NY 13699. RP BARTELT, MC (reprint author), IOWA STATE UNIV SCI & TECHNOL,INST PHYS RES & TECHNOL,AMES,IA 50011, USA. NR 10 TC 4 Z9 4 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 JUL 15 PY 1993 VL 99 IS 2 BP 1438 EP 1439 DI 10.1063/1.465338 PG 2 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LM894 UT WOS:A1993LM89400073 ER PT J AU ARNOLD, CC NEUMARK, DM AF ARNOLD, CC NEUMARK, DM TI STUDY OF C-6(-) AND C-6 WITH THRESHOLD PHOTODETACHMENT SPECTROSCOPY AND AUTODETACHMENT SPECTROSCOPY - REPLY SO JOURNAL OF CHEMICAL PHYSICS LA English DT Letter ID CLUSTERS; SPECTRA C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP ARNOLD, CC (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. RI Neumark, Daniel/B-9551-2009 OI Neumark, Daniel/0000-0002-3762-9473 NR 12 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUL 15 PY 1993 VL 99 IS 2 BP 1442 EP 1443 DI 10.1063/1.465340 PG 2 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LM894 UT WOS:A1993LM89400075 ER PT J AU MINNETT, PJ AF MINNETT, PJ TI SEA-SURFACE TEMPERATURE VARIABILITY OF THE ICELAND-FAEROE FRONT - COMMENT SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Note ID INFRARED MEASUREMENTS; SATELLITE RP MINNETT, PJ (reprint author), BROOKHAVEN NATL LAB,DIV OCEANOG & ATMOSPHER SCI,BLDG 318,UPTON,NY 11973, USA. NR 16 TC 1 Z9 1 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD JUL 15 PY 1993 VL 98 IS C7 BP 12601 EP 12603 DI 10.1029/93JC01247 PG 3 WC Oceanography SC Oceanography GA LN310 UT WOS:A1993LN31000024 ER PT J AU WAGH, AS AF WAGH, AS TI POROSITY DEPENDENCE OF THERMAL-CONDUCTIVITY OF CERAMICS AND SEDIMENTARY-ROCKS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article AB The connected grain model of porous ceramics, developed earlier to explain porosity dependence of the elastic modulus, is extended to study thermal transport. The porosity and grain-size dependence of the thermal conductivity is calculated in terms of a power law. The exponent of the power law is dependent on the skewness of the grain-size distribution. The formalism is compared with the experimental results for isometric spherical-pore distribution in alumina, random-pore distribution in alumina, uranium dioxide and yttria-stabilized zirconia, sedimentary rocks and bricks. Good agreements are found between the experimental results and theoretical predictions based on the microstructure of the, materials and their porosity dependence of the elastic modulus. C1 ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439. RP WAGH, AS (reprint author), UNIV W INDIES,DEPT PHYS,MAT LAB,KINGSTON 7,JAMAICA. OI Wagh, Arun/0000-0002-8678-7574 NR 25 TC 16 Z9 16 U1 1 U2 6 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD JUL 15 PY 1993 VL 28 IS 14 BP 3715 EP 3721 DI 10.1007/BF00353169 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA LP631 UT WOS:A1993LP63100003 ER PT J AU FANG, Y DANYLUK, S LI, Z LAM, D AF FANG, Y DANYLUK, S LI, Z LAM, D TI KNOOP MICROHARDNESS ANISOTROPY OF YBA2CU3O7-DELTA SINGLE-CRYSTALS SO JOURNAL OF MATERIALS SCIENCE LETTERS LA English DT Article ID FRACTURE-TOUGHNESS C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP FANG, Y (reprint author), UNIV ILLINOIS,DEPT CIVIL ENGN MECH & MET,CHICAGO,IL 60680, USA. NR 11 TC 3 Z9 3 U1 0 U2 0 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0261-8028 J9 J MATER SCI LETT JI J. Mater. Sci. Lett. PD JUL 15 PY 1993 VL 12 IS 14 BP 1070 EP 1072 DI 10.1007/BF00420524 PG 3 WC Materials Science, Multidisciplinary SC Materials Science GA LP628 UT WOS:A1993LP62800005 ER PT J AU BARD, AJ ABRUNA, HD CHIDSEY, CE FAULKNER, LR FELDBERG, SW ITAYA, K MAJDA, M MELROY, O MURRAY, RW PORTER, MD SORIAGA, MP WHITE, HS AF BARD, AJ ABRUNA, HD CHIDSEY, CE FAULKNER, LR FELDBERG, SW ITAYA, K MAJDA, M MELROY, O MURRAY, RW PORTER, MD SORIAGA, MP WHITE, HS TI THE ELECTRODE-ELECTROLYTE INTERFACE - A STATUS-REPORT SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Review ID SCANNING TUNNELING MICROSCOPY; SELF-ASSEMBLED MONOLAYERS; LANGMUIR-BLODGETT-FILMS; X-RAY-SCATTERING; CHEMICALLY MODIFIED ELECTRODES; UNDERPOTENTIALLY DEPOSITED COPPER; TRANSFORM INFRARED-SPECTROSCOPY; ORGANIZED MOLECULAR ASSEMBLIES; SINGLE-CRYSTAL ELECTRODES; IONIC CONDUCTOR INTERFACE AB This is a report of a workshop on the ''state of the art' and potential future directions in the study of the electrode/electrolyte interface. Recent advances in experimental capabilities of characterizing the structure of the interface, e.g., through the use of such techniques as scanning tunneling microscopy and X-ray methods, are described. New approaches to studies of interfacial dynamics and materials aspects of the electrode/electrolyte interface are also discussed. C1 CORNELL UNIV, DEPT CHEM, BAKER LAB, ITHACA, NY 14853 USA. STANFORD UNIV, DEPT CHEM, STANFORD, CA 94305 USA. UNIV ILLINOIS, DEPT CHEM, URBANA, IL 61801 USA. BROOKHAVEN NATL LAB, DEPT APPL SCI, UPTON, NY 11973 USA. UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. IBM CORP, ALMADEN RES CTR, SAN JOSE, CA 95120 USA. UNIV N CAROLINA, DEPT CHEM, VENABLE & KENAN LABS, CHAPEL HILL, NC 27599 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. TEXAS A&M UNIV SYST, DEPT CHEM, COLL STN, TX 77843 USA. UNIV UTAH, DEPT CHEM, SALT LAKE CITY, UT 84112 USA. TOHOKU UNIV, FAC ENGN, DEPT CHEM ENGN, SENDAI, MIYAGI 980, JAPAN. RP BARD, AJ (reprint author), UNIV TEXAS, DEPT CHEM & BIOCHEM, AUSTIN, TX 78712 USA. RI Itaya, Kingo/A-6557-2010; Soriaga, Manuel/D-5637-2015 OI Soriaga, Manuel/0000-0002-0077-6226 NR 341 TC 233 Z9 234 U1 8 U2 72 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUL 15 PY 1993 VL 97 IS 28 BP 7147 EP 7173 DI 10.1021/j100130a007 PG 27 WC Chemistry, Physical SC Chemistry GA LV579 UT WOS:A1993LV57900007 ER PT J AU WILLNER, I EICHEN, Y FRANK, AJ FOX, MA AF WILLNER, I EICHEN, Y FRANK, AJ FOX, MA TI PHOTOINDUCED ELECTRON-TRANSFER PROCESSES USING ORGANIZED REDOX-FUNCTIONALIZED BIPYRIDINIUM POLYETHYLENIMINE TIO2 COLLOIDS AND PARTICULATE ASSEMBLIES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID SOLAR-ENERGY CONVERSION; PHOTOELECTROCHEMICAL CELLS; NITRATE REDUCTASE; CARBON-DIOXIDE; VIOLOGEN; SYSTEMS; ENZYME; SEMICONDUCTORS; WATER; REGENERATION AB Polyethylenimine, PEI, acts as an effective supporting polymer for the stabilization of semiconductor colloids of TiO2. Chemical modification of PEI by N-(2-carboxyethyl)-N'-methyl-4,4'-bipyridinium, MVP2+ (2), generates a redox-functionalized polymer, PEI-MVP2+, that also stabilizes TiO2 colloids. Photoreduction of bipyridinium units, which are covalently linked to the polymer backbone within the TiO2-PEI-MVP2+ assembly, proceeds effectively upon excitation of the semiconductor colloid. At pH = 8.9, photoreduction of bipyridinium units of the TiO2-PEI-MVP2+ assembly is ca. 54-fold and 13-fold faster than the reduction of N,N-dimethyl-4,4'-bipyridinium, MV2+, or N,N'-bis(3-sulfonatopropyl)-4,4'-bipyridinium, PVS0, by TiO2-PEI, respectively. At pH = 5.1, photoreduction of PEI-MVP2+ is ca. 92-fold and 12-fold faster than that of MV2+ and PVS0 by TiO2-PEI, respectively. The enhanced yield of reduction of the bipyridinium relay units of the TiO2-PEI-MVP2+ assembly is attributed to the control of electron-transfer reactions at the semiconductor-solution interface. The redox polymer stabilized colloid, TiO2-PEI-MVP2+, concentrates the electron relay units at the semiconductor interface. Consequently, conduction band electrons formed upon photoexcitation of the TiO2 are effectively trapped by the redox relay units on the polymer. This electron trapping competes with the degradative 'electron-hole' recombination. Time-resolved laser photolysis studies reveal that the interfacial electron transfer in the TiO2-PEI-MVP2+ assembly proceeds within the laser pulse time constant (<0.5 ns). On the other hand, reduction of N,N'-dimethyl-4,4'-bipyridinium, MV2+, by TiO2-PEI through a diffusional mechanism is slow, k(et) - 750 +/- 80 s-1. The photoinduced electron-transfer process in TiO2-PEI-MVP2+ was, coupled to the biocatalyzed reduction of nitrate (NO3-) to nitrite (NO2-) by electrostatic association of the enzyme nitrate reductase (E.C. 1.6.6.2) with the polymer backbone. This photo-biocatalyzed electron transfer was also accomplished by applying rigid, functionalized semiconductor particles. In this photosystem, nitrate reductase is covalently linked to the redox polymer PEI-MVP2+-TiO2. C1 HEBREW UNIV JERUSALEM,FARKAS CTR LIGHT INDUCED PROC,IL-91904 JERUSALEM,ISRAEL. NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. UNIV TEXAS,DEPT CHEM,AUSTIN,TX 78712. RP WILLNER, I (reprint author), HEBREW UNIV JERUSALEM,INST CHEM,IL-91904 JERUSALEM,ISRAEL. NR 48 TC 60 Z9 61 U1 1 U2 22 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUL 15 PY 1993 VL 97 IS 28 BP 7264 EP 7271 DI 10.1021/j100130a024 PG 8 WC Chemistry, Physical SC Chemistry GA LV579 UT WOS:A1993LV57900024 ER PT J AU MICIC, OI ZHANG, YN CROMACK, KR TRIFUNAC, AD THURNAUER, MC AF MICIC, OI ZHANG, YN CROMACK, KR TRIFUNAC, AD THURNAUER, MC TI TRAPPED HOLES ON TIO2 COLLOIDS STUDIED BY ELECTRON-PARAMAGNETIC-RESONANCE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID HETEROGENEOUS PHOTOCATALYTIC DECOMPOSITION; AQUEOUS SUSPENSIONS; TITANIUM-DIOXIDE; SPIN-RESONANCE; PHOTO-OXIDATION; SEMICONDUCTOR DISPERSIONS; HYDROXYL RADICALS; SIZE QUANTIZATION; PULSE-RADIOLYSIS; PARTICLES AB An electron paramagnetic resonance (EPR) study of paramagnetic species formed on band gap irradiation of TiO2 colloids, aqueous suspensions of anatase (Degussa P-25), and rutile (Aldrich) powders is reported. The EPR signals (observed at 6-200 K) of the trapped hole in all of these systems exhibit similar properties. Holes produced by band gap irradiation of a TiO2 colloid move from the oxygen lattice to the surface and are trapped directly on oxygen atoms bound to surface Ti(IV) atoms. The results obtained with TiO2 colloids prepared with oxygen-17 enriched water support the identification of trapped holes as an oxygen surface anion radical covalently bound to titanium atoms, Ti(IV)-0-Ti(IV)-O.. The intensity of the EPR signal from the hole trap is very sensitive to hydration and the total surface area available for chemical reactions. The EPR signal disappears with the addition of hole scavengers that are strongly bound to the surface, such as polyvinyl alcohol and KI. The signal obtained for trapped holes at 6-240 K is not the same as that of surface bound or free OH. radicals, since no change in the EPR line width was observed when D2O was used for preparation of colloids instead of H2O. In addition, spectra obtained at Q-band microwave frequency show that the spectral splittings are not due to hyperfine coupling. The EPR signal remains the same with increasing temperature up to 150 K, indicating that primary radicals do not convert into other radicals at higher temperatures. The EPR signal from trapped holes detected in aqueous suspensions of ZnO particles show a similar pattern to that from the TiO2 systems. C1 ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. NR 80 TC 249 Z9 251 U1 1 U2 68 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUL 15 PY 1993 VL 97 IS 28 BP 7277 EP 7283 DI 10.1021/j100130a026 PG 7 WC Chemistry, Physical SC Chemistry GA LV579 UT WOS:A1993LV57900026 ER PT J AU CHEN, CH KEPLER, KD GEWIRTH, AA OCKO, BM WANG, J AF CHEN, CH KEPLER, KD GEWIRTH, AA OCKO, BM WANG, J TI ELECTRODEPOSITED BISMUTH MONOLAYERS ON AU(111) ELECTRODES - COMPARISON OF SURFACE X-RAY-SCATTERING, SCANNING-TUNNELING-MICROSCOPY, AND ATOMIC-FORCE MICROSCOPY LATTICE STRUCTURES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID INSITU; RECONSTRUCTION; DIFFRACTION; GOLD; COMPRESSIBILITY; REFLECTIVITY; DEPOSITION; AG(111) AB Surface X-ray scattering (SXS) and scanning tunneling microscope (STM) studies have been carried out to determine the structure of electrochemically deposited Bi monolayers on a Au(111) electrode. Between 10 and 190 mV (relative to bulk deposition), a uniaxially commensurate rectangular phase is formed in which the Bi coverage decreases from 0.646 to 0.616 relative to a gold monolayer. A 25% coverage (2x2) phase is stable between 200 and 280 mV. The structures determined by SXS and STM are in agreement with those determined previously by AFM. C1 UNIV ILLINOIS,DEPT CHEM,505 S MATHEWS AVE,URBANA,IL 61801. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RI Wang, Jia/B-6346-2011; Chen, Chun-hsien/G-4817-2010 OI Chen, Chun-hsien/0000-0001-5507-3248 NR 22 TC 92 Z9 92 U1 1 U2 13 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUL 15 PY 1993 VL 97 IS 28 BP 7290 EP 7294 DI 10.1021/j100130a028 PG 5 WC Chemistry, Physical SC Chemistry GA LV579 UT WOS:A1993LV57900028 ER PT J AU POSHUSTA, RD TSENG, DC HESS, AC MCCARTHY, MI AF POSHUSTA, RD TSENG, DC HESS, AC MCCARTHY, MI TI PERIODIC HARTREE-FOCK STUDY OF NITRIC-ACID MONOHYDRATE CRYSTAL - BULK AND CLEAN SURFACE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID HETEROGENEOUS REACTIONS; ANTARCTIC OZONE; ELECTRONIC-STRUCTURE; ELASTIC-CONSTANTS; INFRARED-SPECTRA; STRATOSPHERE; TRIHYDRATE; DEPLETION; HOLE; FILMS AB This study reports the first quantum mechanical investigation of crystalline nitric acid monohydrate (NAM), HNO3.H2O. The goal of this work is to characterize the physical properties of NAM in order to better understand its role as a catalyst in the destruction of polar stratospheric ozone in the Antarctic. The computations probed energetic, electronic, and elastic properties of the crystalline material using the Periodic Hartree-Fock (PHF) method (as implemented in the program CRYSTAL92). All calculations were performed by using standard Pople basis sets. A description of the bulk material was obtained from calculations of the estimated cohesive binding energy, optimized lattice constants, band structure, total and projected density of states, Mulliken population analysis, electrostatic potentials, and elastic constants. The computed intracrystal interactions are: consistent with the proposed hydronium/nitrate ionic crystal structure inferred from X-ray diffraction data. The calculated elastic constants, interlayer electrostatic potential maps, and characterization of the bonding in the crystal indicate that NAM is composed of weakly bound puckered layers aligned parallel to the (100) plane in the crystal. Accordingly, a surface that exposes such a puckered layer would be expected to have the minimum surface energy. The properties of this surface were studied by using a model system that consists of a two-layer slab of NAM formed by cleaving along the (100) direction in the crystal. This computational model represents a finite-thickness thin film that is periodic in two dimensions and finite along the remaining coordinate. A comparison is made between the computed properties of the bulk material and the model (100) NAM surface. Maps of the electrostatic potential above and within the slab are used to predict favorable sites for physisorption on the (100) surface of NAM crystals. These sites may be important regions for surface catalysis. C1 PACIFIC NW LAB, MOLEC SCI RES CTR, MS K1-90, RICHLAND, WA 99352 USA. WASHINGTON STATE UNIV, MAT SCI PROGRAM, PULLMAN, WA 99164 USA. WASHINGTON STATE UNIV, DEPT CHEM, PULLMAN, WA 99164 USA. NR 59 TC 13 Z9 13 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUL 15 PY 1993 VL 97 IS 28 BP 7295 EP 7303 DI 10.1021/j100130a029 PG 9 WC Chemistry, Physical SC Chemistry GA LV579 UT WOS:A1993LV57900029 ER PT J AU MILLS, MJ AF MILLS, MJ TI HIGH-RESOLUTION TRANSMISSION ELECTRON-MICROSCOPY AND ATOMISTIC CALCULATIONS OF GRAIN-BOUNDARIES IN METALS AND INTERMETALLICS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT WORKSHOP ON GRAIN BOUNDARY AND INTERFACE PHENOMENA IN THE HIGH TEMPERATURE PLASTICITY OF SOLIDS CY OCT 12-16, 1992 CL OAKLAND, CA SP US DOE, OFF BASIC ENERGY SCI, DIV MAT SCI ID SYMMETRICAL TILT BOUNDARIES; TRANSITION-METALS; COMPUTER-SIMULATION; CHARGE-DENSITIES; FCC METALS; NI3AL; ALUMINUM; ALLOYS; BORON; SEGREGATION AB A review of grain boundary studies in metals and alloys using high resolution transmission electron microscopy and atomistic calculations is presented, with an emphasis on the relevance of the results to grain boundary structure and properties. While a number of studies on boundaries in both pure metals and alloys will be discussed, the paper will focus on symmetric tilt boundaries in aluminum and the determination of compositional ordering at grain boundaries in Ni3Al. The conclusions to be drawn from these comparisons will be discussed, and future prospects for joint experimental and theoretical studies will be presented. RP MILLS, MJ (reprint author), SANDIA NATL LABS, LIVERMORE, CA 94551 USA. NR 102 TC 25 Z9 25 U1 0 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 15 PY 1993 VL 166 IS 1-2 BP 35 EP 50 DI 10.1016/0921-5093(93)90308-2 PG 16 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA LR199 UT WOS:A1993LR19900005 ER PT J AU WADSWORTH, J NIEH, TG AF WADSWORTH, J NIEH, TG TI SUPERPLASTICITY IN CERAMIC AND METAL-MATRIX COMPOSITES AND THE ROLE OF GRAIN-SIZE, SEGREGATION, INTERFACES, AND 2ND PHASE MORPHOLOGY SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID MECHANICALLY ALLOYED ALUMINUM; HIGH-STRAIN RATES; STABILIZED TETRAGONAL ZIRCONIA; LIQUID-PHASE; BEHAVIOR; DEFORMATION; DUCTILITY; PRESSURE; GROWTH; CREEP AB Structural ceramics and ceramic composites have been shown to exhibit superplasticity in recent times and this discovery has attracted tremendous interest. Although the number of ceramics that have been found to exhibit superplasticity is now quite large, there are considerable gaps in the understanding of the detailed requirements for superplasticity in ceramics. Additionally, superplastic behavior at very high strain rates (1 s-1) in metallic-based materials is an area of increasing research. In this case, the phenomenon has been observed quite extensively in aluminum alloy-based metal matrix composites and mechanically alloyed aluminum- and nickel-based materials. Again, the details of the structural requirements of this phenomenon are not yet understood. In the present paper, experimental results on superplasticity in ceramic-based materials and on high strain rate behavior in metallic-based materials are presented. The roles of grain size, grain boundary and interface chemistry, and second phase morphology and compatibility with the matrix material will be emphasized. RP WADSWORTH, J (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 808, L353, LIVERMORE, CA 94550 USA. RI Nieh, Tai-Gang/G-5912-2011 OI Nieh, Tai-Gang/0000-0002-2814-3746 NR 59 TC 16 Z9 16 U1 0 U2 3 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 15 PY 1993 VL 166 IS 1-2 BP 97 EP 108 DI 10.1016/0921-5093(93)90314-5 PG 12 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA LR199 UT WOS:A1993LR19900011 ER PT J AU HENAGER, CH JONES, RH AF HENAGER, CH JONES, RH TI HIGH-TEMPERATURE PLASTICITY EFFECTS IN BRIDGED CRACKS AND SUBCRITICAL CRACK-GROWTH IN CERAMIC COMPOSITES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID SIC FIBERS; NICALON AB The time-dependent plasticity of the crack-wake bridging zone at high temperatures is found to control the rate of subcritical crack growth in continuous-fiber-reinforced ceramic composites. Subcritical crack growth measurements of ceramic matrix composites were conducted on materials consisting of chemical-vapor infiltrated SiC matrix reinforced with Nicalon fibers (SiC/SiC(f)) having C and BN fiber-matrix interfaces. Crack velocities were determined as a function of stress intensity in pure Ar and in Ar + 2000 ppm O2 at 1100-degrees-C. A stage II regime, where the crack velocity is weakly dependent on the applied stress intensity, characterized the V-K data over a range of stress intensities corresponding to the R curve of the material. This stage II behavior was followed by a stage III, or power-law, regime at higher stress intensities. Oxygen increased the crack velocity in the stage II regime and shifted the stage II to stage III transition to lower stress intensities. A two-dimensional micromechanics approach modeled the time-dependence of crack bridging by allowing fiber creep and was able to rationalize the observed velocity measurements and the stage II to stage III transition. RP PACIFIC NW LAB, BATTELLE BLVD, RICHLAND, WA 99352 USA. OI Henager, Chuck/0000-0002-8600-6803 NR 17 TC 35 Z9 35 U1 0 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 EI 1873-4936 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 15 PY 1993 VL 166 IS 1-2 BP 211 EP 220 DI 10.1016/0921-5093(93)90324-8 PG 10 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA LR199 UT WOS:A1993LR19900021 ER PT J AU RITCHIE, RO CANNON, RM DALGLEISH, BJ DAUSKARDT, RH MCNANEY, JM AF RITCHIE, RO CANNON, RM DALGLEISH, BJ DAUSKARDT, RH MCNANEY, JM TI MECHANICS AND MECHANISMS OF CRACK-GROWTH AT OR NEAR CERAMIC-METAL INTERFACES - INTERFACE ENGINEERING STRATEGIES FOR PROMOTING TOUGHNESS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT WORKSHOP ON GRAIN BOUNDARY AND INTERFACE PHENOMENA IN THE HIGH TEMPERATURE PLASTICITY OF SOLIDS CY OCT 12-16, 1992 CL OAKLAND, CA SP US DOE, OFF BASIC ENERGY SCI, DIV MAT SCI ID FRACTURE ENERGY; PATH SELECTION; PROPAGATION; RESISTANCE; LAYER AB The strength and toughness of ceramic-metal joints is often controlled by the propagation path selected by stress-induced cracks. Against a background of recent linear elastic mechanics studies, experimental results from fracture tests on ceramic/metal/ceramic sandwich geometries are described which determine both the selection of crack path and the corresponding crack extension rates. It is found that crack path selection is controlled by the path of low microstructural resistance and the driving force directionality, which itself is a function of the far-field loading and the elastic compliance mismatch across the ceramic-metal interface. However, there are instances where the compliance mismatch takes the crack off the weak microstructural path, or where cracking occurs at, or near, both interfaces (crack jumping). Such cracking configurations can be tortuous and high toughness joints result. This paper discusses the potential for predicting, and engineering, interfaces with enhanced toughness. C1 UNIV CALIF BERKELEY, DEPT MAT SCI & ENGN, BERKELEY, CA 94720 USA. RP RITCHIE, RO (reprint author), LAWRENCE BERKELEY LAB, DIV MAT SCI, CTR ADV MAT, BERKELEY, CA 94720 USA. RI Ritchie, Robert/A-8066-2008; McNaney, James/F-5258-2013 OI Ritchie, Robert/0000-0002-0501-6998; NR 52 TC 60 Z9 60 U1 0 U2 7 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 15 PY 1993 VL 166 IS 1-2 BP 221 EP 235 DI 10.1016/0921-5093(93)90325-9 PG 15 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA LR199 UT WOS:A1993LR19900022 ER PT J AU LANGDON, TG WATANABE, T WADSWORTH, J MAYO, MJ NUTT, SR KASSNER, ME AF LANGDON, TG WATANABE, T WADSWORTH, J MAYO, MJ NUTT, SR KASSNER, ME TI FUTURE-RESEARCH DIRECTIONS FOR INTERFACE ENGINEERING IN HIGH-TEMPERATURE PLASTICITY SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT WORKSHOP ON GRAIN BOUNDARY AND INTERFACE PHENOMENA IN THE HIGH TEMPERATURE PLASTICITY OF SOLIDS CY OCT 12-16, 1992 CL OAKLAND, CA SP US DOE, OFF BASIC ENERGY SCI, DIV MAT SCI AB This paper summarizes briefly some of the conclusions arising from the workshop on Grain Boundary and Interface Phenomena in the High Temperature Plasticity of Solids and outlines possible directions for future research. C1 UNIV SO CALIF,DEPT MECH ENGN,LOS ANGELES,CA 90089. TOHOKU UNIV,FAC ENGN,DEPT MAT SCI,SENDAI,MIYAGI 980,JAPAN. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. PENN STATE UNIV,DEPT MAT SCI & ENGN,UNIV PK,PA 16802. BROWN UNIV,DIV ENGN,PROVIDENCE,RI 02912. OREGON STATE UNIV,DEPT MECH ENGN,CORVALLIS,OR 97331. RP LANGDON, TG (reprint author), UNIV SO CALIF,DEPT MAT SCI,LOS ANGELES,CA 90089, USA. RI Langdon, Terence/B-1487-2008 NR 0 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 15 PY 1993 VL 166 IS 1-2 BP 237 EP 241 DI 10.1016/0921-5093(93)90326-A PG 5 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA LR199 UT WOS:A1993LR19900023 ER PT J AU KELLER, CK WOOD, BD AF KELLER, CK WOOD, BD TI POSSIBILITY OF CHEMICAL-WEATHERING BEFORE THE ADVENT OF VASCULAR LAND PLANTS SO NATURE LA English DT Article ID CARBON-DIOXIDE; UNSATURATED ZONE; ISOTOPIC COMPOSITION; PHANEROZOIC TIME; UNITED-STATES; GREAT PLAINS; CLAYEY TILL; ATMOSPHERE; CO2; HYDROGEOCHEMISTRY AB CHEMICAL weathering today is generally assumed to occur primarily in soils1,2. The rise of vascular plants during the Silurian and Devonian periods about 400 Myr ago brought about an increase in soil microbial activity and thus in soil CO2 generation, and it has therefore been widely believed that, as a result of these changes, soil CO2 replaced atmospheric CO2 as the primary agent of chemical weathering3-6. Here we show that the aerated region above the water table (the vadose zone) exerts a strong influence on the CO2 concentration to which runoff is exposed as it percolates beneath the soil, and we argue that this could have been the case before the Silurian. We present calculations which show that, for present-day atmospheric CO2 concentrations, a low level of microbial - respiration may be sufficient to support appreciable CO2 concentrations in the vadose zone because of the slow rate of CO2 loss to the surface. Despite the small amount of microbial respiration in pre-Silurian soilS, CO2 concentrations in subsoil vadose zones might therefore have been sufficient to account for the apparent constancy of chemical weathering since the mid-Proterozoic7, obviating the need to invoke high levels of atmospheric CO2 to explain the weathering record. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP KELLER, CK (reprint author), WASHINGTON STATE UNIV, DEPT GEOL, PULLMAN, WA 99164 USA. RI Keller, C/B-3205-2012; Wood, Brian/K-4025-2012; Wood, Brian/J-8362-2013 OI Wood, Brian/0000-0003-3152-7852; Wood, Brian/0000-0003-3152-7852 NR 42 TC 33 Z9 34 U1 1 U2 7 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD JUL 15 PY 1993 VL 364 IS 6434 BP 223 EP 225 DI 10.1038/364223a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM683 UT WOS:A1993LM68300052 ER PT J AU BROSS, A GORMLEY, M HO, Y KIM, C LEE, W MANNEL, E MURTAGH, M ODAY, S PARK, H AF BROSS, A GORMLEY, M HO, Y KIM, C LEE, W MANNEL, E MURTAGH, M ODAY, S PARK, H TI MEASUREMENT OF THE CIRCULATING MUON FLUX IN THE FERMILAB DEBUNCHER RING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Using a novel experimental technique, we have measured the flux of pions, electrons, muons, and antiprotons which are injected into and circulate in the Fermilab Debuncher ring. The experimental technique relied upon the use of a nondestructive, rf pickup to measure the bunch structure of the beam on a turn-by-turn basis. The measured muon to antiproton ratio is mu-/p = 1.0 +/- 0.2, and the ratio of muons to protons on target is mu-/poT = 2.0 +/- 0.4 x 10(-5). C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. COLUMBIA UNIV,NEW YORK,NY 10027. RP BROSS, A (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 15 PY 1993 VL 332 IS 1-2 BP 27 EP 31 DI 10.1016/0168-9002(93)90739-5 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LM095 UT WOS:A1993LM09500003 ER PT J AU ANTONIAZZI, L ARENTON, M CAO, Z CHEN, TY CONETTI, S COX, B DELCHAMPS, S FORTNEY, L GUFFEY, K HAIRE, M HE, M IOANNOU, P JENKINS, CM JUDD, DJ KOURKOUMELIS, C MANOUSAKISKATSIKAKIS, A KUZMINSKI, J LECOMPTE, T MARCHIONNI, A MAZUR, PO MURPHY, CT PRAMANTIOTIS, P RAMEIKA, R RESVANIS, L ROSATI, M ROSEN, J SHEN, CH SHEN, Q SIMARD, A SMITH, R SPIEGEL, L STAIRS, D TAN, Y TESAREK, RJ TURKINGTON, T TURNBULL, L TURKOT, F TZAMARIAS, S VOULGARIS, G WAGONER, DE WANG, C WECKEL, J YANG, W YAO, N ZHANG, N ZHANG, X ZIOULAS, G ZOU, B AF ANTONIAZZI, L ARENTON, M CAO, Z CHEN, TY CONETTI, S COX, B DELCHAMPS, S FORTNEY, L GUFFEY, K HAIRE, M HE, M IOANNOU, P JENKINS, CM JUDD, DJ KOURKOUMELIS, C MANOUSAKISKATSIKAKIS, A KUZMINSKI, J LECOMPTE, T MARCHIONNI, A MAZUR, PO MURPHY, CT PRAMANTIOTIS, P RAMEIKA, R RESVANIS, L ROSATI, M ROSEN, J SHEN, CH SHEN, Q SIMARD, A SMITH, R SPIEGEL, L STAIRS, D TAN, Y TESAREK, RJ TURKINGTON, T TURNBULL, L TURKOT, F TZAMARIAS, S VOULGARIS, G WAGONER, DE WANG, C WECKEL, J YANG, W YAO, N ZHANG, N ZHANG, X ZIOULAS, G ZOU, B TI THE EXPERIMENT 705 ELECTROMAGNETIC SHOWER CALORIMETER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID GEV POSITRONS; GLASS ARRAY; SCINTILLATION; DETECTOR AB Experiment 705 at Fermi National Accelerator Laboratory has designed, built, and operated a large acceptance, highly segmented electromagnetic shower calorimeter using SF5 lead glass, SCG1-C scintillating glass, and two types of gas-based fine-grained hodoscopes. The calorimeter was used to reconstruct photons and electrons with energies ranging from a few GeV/c2 to over 100 GeV/c2 in 300 GeV/c pion and proton interactions on a lithium target at instantaneous interaction rates approaching several MHz. Construction details of the calorimeter are given. The readout electronics, calibration, and algorithms used to reconstruct the positions and energies of showering particles are discussed. Energy resolution, position resolution, and reconstruction efficiency are assessed using both calibration electron beams and electrons and pi0 mesons reconstructed in 300 GeV/c interactions. C1 DUKE UNIV,DURHAM,NC 27706. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. SHANDONG UNIV,SHANDONG,PEOPLES R CHINA. MCGILL UNIV,MONTREAL H3A 2T5,QUEBEC,CANADA. PRAIRIE VIEW A&M UNIV,PRAIRIE VIEW,TX 77445. UNIV VIRGINIA,CHARLOTTESVILLE,VA 22903. NANJING UNIV,NANJING,PEOPLES R CHINA. NORTHWESTERN UNIV,EVANSTON,IL 60201. RP ANTONIAZZI, L (reprint author), UNIV ATHENS,ATHENS,GREECE. NR 18 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 15 PY 1993 VL 332 IS 1-2 BP 57 EP 77 DI 10.1016/0168-9002(93)90741-Y PG 21 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LM095 UT WOS:A1993LM09500005 ER PT J AU BENARY, O CANNON, S CLELAND, W FERGUSON, I FINLEY, C GORDEEV, A GORDON, H KISTENEV, E KROON, P LETCHOUK, M LISSAUER, D MA, H MAKOWIECKI, D MASLENNIKOV, A MCCORKLE, S ONOPRIENKO, D ONUCHIN, A OREN, Y PANIN, V PARSONS, J RABEL, J RADEKA, V ROGERS, L RAHM, D RESCIA, S RUTHERFOORD, J SEMAN, M SMITH, M SONDERICKER, J STEINER, R STEPHANI, D STERN, E STUMER, I TAKAI, H THEMANN, H TIKHONOV, Y AF BENARY, O CANNON, S CLELAND, W FERGUSON, I FINLEY, C GORDEEV, A GORDON, H KISTENEV, E KROON, P LETCHOUK, M LISSAUER, D MA, H MAKOWIECKI, D MASLENNIKOV, A MCCORKLE, S ONOPRIENKO, D ONUCHIN, A OREN, Y PANIN, V PARSONS, J RABEL, J RADEKA, V ROGERS, L RAHM, D RESCIA, S RUTHERFOORD, J SEMAN, M SMITH, M SONDERICKER, J STEINER, R STEPHANI, D STERN, E STUMER, I TAKAI, H THEMANN, H TIKHONOV, Y TI PRECISION TIMING WITH LIQUID IONIZATION CALORIMETERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID NOISE AB We present timing measurements performed with a liquid krypton electromagnetic accordion calorimeter, measured in an electron beam over an energy range of 5-20 GeV. A novel discriminator with an amplitude-independent timing response was used to extract the inherently accurate timing information from the calorimeter. As expected, the timing resolution sigma(tau) is observed to vary inversely with the signal amplitude, which is proportional to the deposited energy E. We measure a resolution of sigma(tau) = 4.15 +/- 0.06 GeV ns/E for a sum of 5 x 5 towers with dimensions 2.7 x 2.5 cm2 each. From this we deduce that the timing resolution for an individual tower is approximately 0.8 GeV ns/E. C1 UNIV ARIZONA,TUCSON,AZ 85721. BROOKHAVEN NATL LAB,UPTON,NY 11973. BUDKER NUCL PHYS INST,NOVOSIBIRSK,RUSSIA. COLUMBIA UNIV,NEW YORK,NY. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV PITTSBURGH,PITTSBURGH,PA 15260. TEL AVIV UNIV,IL-69978 TEL AVIV,ISRAEL. SUNY,STONY BROOK,NY 11794. RP BENARY, O (reprint author), ADELPHI UNIV,GARDEN CITY,NY 11530, USA. RI Rescia, Sergio/D-8604-2011; Takai, Helio/C-3301-2012 OI Rescia, Sergio/0000-0003-2411-8903; Takai, Helio/0000-0001-9253-8307 NR 7 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 15 PY 1993 VL 332 IS 1-2 BP 78 EP 84 DI 10.1016/0168-9002(93)90742-Z PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LM095 UT WOS:A1993LM09500006 ER PT J AU PETRY, F PIEPKE, A STRECKER, H KLAPDORKLEINGROTHAUS, HV BALYSH, A BELYAEV, ST DEMEHIN, A GUROV, A KONDRATENKO, I KOTELNIKOV, D LEBEDEV, VI LANDIS, D MADDEN, N PEHL, RH AF PETRY, F PIEPKE, A STRECKER, H KLAPDORKLEINGROTHAUS, HV BALYSH, A BELYAEV, ST DEMEHIN, A GUROV, A KONDRATENKO, I KOTELNIKOV, D LEBEDEV, VI LANDIS, D MADDEN, N PEHL, RH TI BACKGROUND RECOGNITION IN GE DETECTORS BY PULSE-SHAPE ANALYSIS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID GERMANIUM DETECTORS AB A method of event identification that distinguishes single and multiple-site events by determining the number of interactions in a high purity germanium detector is reported. The selectivity of the method has been experimentally verified. C1 RUSSIAN CTR KURCHATOV INST,MOSCOW 123182,RUSSIA. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP PETRY, F (reprint author), MAX PLANCK INST NUCL PHYS,W-6900 HEIDELBERG 1,GERMANY. NR 8 TC 20 Z9 20 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 15 PY 1993 VL 332 IS 1-2 BP 107 EP 112 DI 10.1016/0168-9002(93)90746-5 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LM095 UT WOS:A1993LM09500010 ER PT J AU PRONKO, JG GUTTMAN, JL BURGINYON, GA JACOBY, B AF PRONKO, JG GUTTMAN, JL BURGINYON, GA JACOBY, B TI ABSOLUTE FLUORESCENCE YIELDS OF LONG AND SHORT-TERM DECAY COMPONENTS OF SELECTED SCINTILLATORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Experiments were performed to measure the absolute yield of both the prompt fluorescence component ( < 10 ns) and the total fluorescence component for a matrix of scintillator materials (NE-111A, PILOT-U, BC-418, BC-422, BC-430, CdS, and WL-1201). A 3 ns burst of approximately 1 keV CU(L) X-rays from a laser-induced plasma was used as an excitation source for measuring the ratio of the prompt to total fluorescence yield while CU(L) X-rays generated with a low-voltage proton accelerator and a Cu target was used as an excitation source for measuring the absolute total fluorescence yield. The results indicate that some scintillators have as little as 40% of the fluorescence radiated in the prompt portion ( < 10 ns) of the fluorescence emission. The remainder of the yield is in the long fluorescence tail ( > 10 ns) which typically extends beyond the window of fast waveform recording systems. C1 LAWRENCE LIVERMORE NATL LAB,DIV L,LIVERMORE,CA 94550. RP PRONKO, JG (reprint author), LOCKHEED PALO ALTO RES LABS,DIV RES & DEV,B255 O-91-10,3251 HANOVER ST,PALO ALTO,CA 94304, USA. NR 8 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 15 PY 1993 VL 332 IS 1-2 BP 121 EP 128 DI 10.1016/0168-9002(93)90748-7 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LM095 UT WOS:A1993LM09500012 ER PT J AU KRISHNAGOPAL, S RANGARAJAN, G SESSLER, A AF KRISHNAGOPAL, S RANGARAJAN, G SESSLER, A TI THE MULTICAVITY FREE-ELECTRON LASER SO OPTICS COMMUNICATIONS LA English DT Article AB Analysis is made of a free-electron laser with many optical cavities where the cavities communicate with each other, not optically, but through the electron beam. Analytic analysis is made in a one-dimensional, linear approximation. A general expression is given for the growth rate in the exponential (high current) regime. In the regime where lethargy is important expressions are given in the two opposite limits of small and large numbers of cavities and bunches. Numerical simulation results, still in the one-dimensional approximation, but including nonlinearities, are presented. Three examples of the multi-cavity free-electron laser (MC/FEL) are presented. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 7 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD JUL 15 PY 1993 VL 100 IS 5-6 BP 518 EP 525 DI 10.1016/0030-4018(93)90253-2 PG 8 WC Optics SC Optics GA LL312 UT WOS:A1993LL31200018 ER PT J AU DASILVA, LB MACGOWAN, BJ MROWKA, S KOCH, JA LONDON, RA MATTHEWS, DL UNDERWOOD, JH AF DASILVA, LB MACGOWAN, BJ MROWKA, S KOCH, JA LONDON, RA MATTHEWS, DL UNDERWOOD, JH TI POWER MEASUREMENTS OF A SATURATED YTTRIUM X-RAY LASER SO OPTICS LETTERS LA English DT Article ID PLASMA AB We report on measurements of the output power from the J = 2-1 (lambda = 15.5 nm) neonlike yttrium soft-x-ray laser. The results show peak powers of 32 MW in an output pulse width of 200 ps (FWHM) and an integrated energy of 7 mJ. The output is consistent with the expected saturation intensity of this laser and makes this system one of the brightest XUV sources available. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP DASILVA, LB (reprint author), LAWRENCE LIVERMORE NATL LAB, MS L-476,POB 808, LIVERMORE, CA 94550 USA. NR 16 TC 93 Z9 97 U1 0 U2 2 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 JUL 15 PY 1993 VL 18 IS 14 BP 1174 EP 1176 DI 10.1364/OL.18.001174 PG 3 WC Optics SC Optics GA LL313 UT WOS:A1993LL31300018 PM 19823325 ER PT J AU WHITE, DC AF WHITE, DC TI IN-SITU MEASUREMENT OF MICROBIAL BIOMASS, COMMUNITY STRUCTURE AND NUTRITIONAL-STATUS SO PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES LA English DT Article ID FATTY-ACID; ESTUARINE SEDIMENTS; QUANTITATIVE-DETERMINATION; BACTERIA; PROFILES; TRANS AB In sediments and soils the extant microbiota that can be counted by direct microscopy have proved exceedingly difficult to isolate and culture. Classical tests are time consuming and provide little indication of the interactions within the community, the community nutritional status or metabolic activity, The in situ method is based on the extraction of 'signature' lipid biomarkers (SLB) from the cell membranes and walls of microorganisms. Lipids are cellular components that are recoverable by extraction with organic solvents. Lipids are an essential component of the membrane of all cells and play a role as storage materials. Extraction of the lipid components of the microbiota from soils and sediments provides both purification and concentration together with an in situ quantitative analysis of the microbial biomass, community structure, and nutritional status. The determination of the total phospholipid ester-linked fatty acids (PLFA) provides a quantitative measure of the viable biomass. Viable microbes have an intact membrane which contains phospholipids (and PLFA). With cell death enzymes hydrolyze the phosphate group within minutes to hours. The lipid core remains as diglyceride (DG). The resulting DG has the same signature fatty acids as the phospholipids (until it degrades) so a comparison of the ratio Of PLFA to DG provides an indication of the viable and non-viable microbes. AnalysiS by SLB technique provides a quantitative definition of the microbial community structure as specific groups of microbes contain characteristic PLFA patterns. The analysis of other lipids such as the sterols (for the microeukaryotes - nematodes, algae, protozoa), glycolipids (for the phototrophs, gram-positive bacteria), or the hydroxy fatty acids in the lipopolysaccharide of the lipid A (gram-negative bacteria) can provide more detailed community structure analysis. The formation of poly beta-hydroxyalkanoic acid (PHA) in bacteria or triglyceride (TG) in the microeukaryotes relative to the PLFA provides a measure of the nutritional status. Bacteria grown with adequate carbon and terminal electron acceptors form PHA when they cannot divide, because some essential component is missing. Rates of incorporation of C-14-acetate into PHA relative to PLFA is a sensitive indicator of disturbance artifacts in estimates of metabolic activity in sediments with redox gradients. Exposure to toxic environments can lead to minicell formation and increases in specific PLFAS. Respiratory quinone structure indicates the proportions of aerobic/anaerobic activities in the community. The SLB technology provides quantitative in situ information that -define the microbial ecology in sedimentary geochemical processes. RP WHITE, DC (reprint author), UNIV TENNESSEE,OAK RIDGE NATL LAB,CTR ENVIRONM BIOTECHNOL,10515 RES DR,SUITE 300,KNOXVILLE,TN 37932, USA. NR 34 TC 37 Z9 39 U1 1 U2 19 PU ROYAL SOC LONDON PI LONDON PA 6 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5AG SN 0962-8428 J9 PHILOS T ROY SOC A JI Philos. Trans. R. Soc. Lond. Ser. A-Math. Phys. Eng. Sci. PD JUL 15 PY 1993 VL 344 IS 1670 BP 59 EP 67 DI 10.1098/rsta.1993.0075 PG 9 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LQ080 UT WOS:A1993LQ08000007 ER PT J AU AHRENS, ET REYES, AP HAMMEL, PC THOMPSON, JD CANFIELD, PC FISK, Z SCHIRBER, JE AF AHRENS, ET REYES, AP HAMMEL, PC THOMPSON, JD CANFIELD, PC FISK, Z SCHIRBER, JE TI THERMAL HISTORY-DEPENDENT SUPERCONDUCTIVITY AND LOCAL-STRUCTURE IN LA2CUO4+DELTA SO PHYSICA C LA English DT Article ID PHASE-SEPARATION; OXYGENATED LA2CUO4+DELTA; NEUTRON-DIFFRACTION; LA-139 NMR; CRYSTAL; TC; LA2-XSRXCUO4; TEMPERATURE AB DC magnetic susceptibility measurements reveal a dependence of the superconducting critical temperature (T(c)) on the cooling rate (R) in super-oxygenated La2CuO4+delta. Bulk T(c)'s vary by approximately 4 K depending on whether the sample is ''quenched'' or slow cooled through a narrow temperature range around 195 +/- 10 K. La-139 nuclear quadrupole resonance spectroscopy (NQR) shows the appearance of a feature indicating a distribution of local structures in the metallic phase below approximately 195 K, the same temperature regime where R is critical for T(c). The spectral weight associated with the metallic phase appears to increase for rapid cooling. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP AHRENS, ET (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Canfield, Paul/H-2698-2014; Hammel, P Chris/O-4845-2014 OI Hammel, P Chris/0000-0002-4138-4798 NR 22 TC 25 Z9 25 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 JUL 15 PY 1993 VL 212 IS 3-4 BP 317 EP 322 DI 10.1016/0921-4534(93)90595-H PG 6 WC Physics, Applied SC Physics GA LN085 UT WOS:A1993LN08500009 ER PT J AU LINDROOS, M BANSIL, A GOFRON, K CAMPUZANO, JC DING, H LIU, R VEAL, BW AF LINDROOS, M BANSIL, A GOFRON, K CAMPUZANO, JC DING, H LIU, R VEAL, BW TI SIGNATURE OF THE CUO2 PLANE RELATED BANDS IN YBA2CU3O6.9 AS SEEN BY ANGLE-RESOLVED PHOTOEMISSION SO PHYSICA C LA English DT Article ID FERMI-SURFACE; ELECTRONIC-STRUCTURE; ALLOYS; YBA2CU3O7-DELTA; SUPERCONDUCTOR AB The intensity and polarization dependence of the spectral feature in angle-resolved photoemission (ARPES) associated with the CuO2 plane bands from the YBa2Cu3O7 (001 ) surface is computed for the first time within the band theory framework, and the corresponding polarization-dependent ARPES measurements are presented. The theoretical predictions are in remarkable agreement with the experimental features along the GAMMA-S line which have been interpreted as the signature Of CuO2 plane bands crossing the Fermi energy. Our results clearly establish that the bulk CuO2 plane bands are indeed observed by ARPES, and indicate that the local-density-approximation based wave functions implicit in the band theory reasonably describe the physical situation. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV ILLINOIS,CHICAGO,IL 60607. RP LINDROOS, M (reprint author), NORTHEASTERN UNIV,DEPT PHYS,BOSTON,MA 02115, USA. RI Campuzano, Juan Carlos/G-4358-2012; OI Ding, Hong/0000-0003-4422-9248 NR 21 TC 22 Z9 22 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUL 15 PY 1993 VL 212 IS 3-4 BP 347 EP 351 DI 10.1016/0921-4534(93)90599-L PG 5 WC Physics, Applied SC Physics GA LN085 UT WOS:A1993LN08500013 ER PT J AU CHO, JH JOHNSTON, DC LEDVIJ, M KOGAN, VG AF CHO, JH JOHNSTON, DC LEDVIJ, M KOGAN, VG TI VORTEX FLUCTUATIONS IN POLYCRYSTALLINE BI1.75PB0.25SR2CA2CU3O10 SO PHYSICA C LA English DT Article ID MAGNETIC-PROPERTIES AB Reversible magnetization M(H, T) data are reported for polycrystalline Bi1.75Pb0.25Sr2Ca2Cu3O10. After subtraction of the normal state contribution, the data exhibit a characteristic fluctuations dominated behavior near the critical temperature, already observed experimentally and explained theoretically for single crystals of weakly coupled layered superconductors with the magnetic field along the c crystal direction. It is shown that the M(H, T) behavior is compatible with the notion that only the field component along the c-axis of each crystalline grain results in an induced superconducting state magnetization. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. NR 12 TC 29 Z9 29 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 JUL 15 PY 1993 VL 212 IS 3-4 BP 419 EP 423 DI 10.1016/0921-4534(93)90609-T PG 5 WC Physics, Applied SC Physics GA LN085 UT WOS:A1993LN08500023 ER PT J AU GUO, D MAZUMDAR, S DIXIT, SN KAJZAR, F JARKA, F KAWABE, Y PEYGHAMBARIAN, N AF GUO, D MAZUMDAR, S DIXIT, SN KAJZAR, F JARKA, F KAWABE, Y PEYGHAMBARIAN, N TI ROLE OF THE CONDUCTION-BAND IN ELECTROABSORPTION, 2-PHOTON ABSORPTION, AND 3RD-HARMONIC GENERATION IN POLYDIACETYLENES SO PHYSICAL REVIEW B LA English DT Article ID 3RD-ORDER NONLINEAR SUSCEPTIBILITY; ONE-DIMENSIONAL EXCITONS; CONJUGATED POLYMERS; OPTICAL SPECTROSCOPY; THIN-FILMS; SPECTRA; STATES; POLYACETYLENE; ELECTROREFLECTANCE; CRYSTALS AB We report experimental and theoretical investigations of electroabsorption in a polydiacetylene, and determine the complete mechanism of third-harmonic generation (THG) and two-photon absorption (TPA) in linear-chain pi-conjugated polymers. The experimental electroabsorption is studied by transmission, rather than reflectance techniques. In addition to the Stark shift of the exciton, a significant feature is observed in the difference spectrum at a higher energy, where the linear absorption is negligible. The origin of this high-energy feature has been controversial. We report several extensive theoretical calculations within the extended Hubbard model, and are able to establish a universality that exists within one-dimensional Coulomb correlated models. We show that the high-energy oscillatory feature in the electroabsorption spectrum originates from the conduction-band threshold, which is separated from the exciton in polydiacetylenes. We also demonstrate that even-parity two-photon states that occur below the one-photon exciton are not observed in electroabsorption due to a cancellation effect. However, a dominant two-photon state that is predicted to occur in between the lowest optical exciton and the conduction-band threshold should be observable. The cancellation, which is only partial for the dominant two-photon state, can, however, reduce the intensity of the resonance due to the state. We show that the conduction-band threshold state, which is an odd-parity one-photon state, also plays an important role in other nonlinear optical processes such as third-harmonic generation and two-photon absorption. Third-order optical nonlinearity in linear-correlated chains is dominated by four essential states: the ground state, the lowest optical exciton and the conduction-band threshold states, and the two-photon state that lies in between the two excited odd-parity states. The two most important predictions of our theoretical work are (a) third-harmonic-generation experiments on ideal isolated strands should find two, not merely one, three-photon resonances, originating from the exciton and the conduction-band threshold states, and (b) only one dominant two-photon resonance in the infinite-chain limit should be observable in THG and TPA. Extensive comparisons between theoretical predictions and experiments are made to prove the validity of the theory. Conjugated polymers other than the polydiacetylenes are discussed briefly. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. LAB PHYS ELECTRON MAT,F-91191 GIF SUR YVETTE,FRANCE. UNIV ARIZONA,CTR OPT SCI,TUCSON,AZ 85721. IDEMITSU KOSAN CO LTD,CENT RES LABS,CHIBA 29902,JAPAN. RP GUO, D (reprint author), UNIV ARIZONA,DEPT PHYS,TUCSON,AZ 85721, USA. NR 68 TC 155 Z9 156 U1 1 U2 19 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 JUL 15 PY 1993 VL 48 IS 3 BP 1433 EP 1459 DI 10.1103/PhysRevB.48.1433 PG 27 WC Physics, Condensed Matter SC Physics GA LP050 UT WOS:A1993LP05000011 ER PT J AU SAMARA, GA TARDY, HL VENTURINI, EL ASELAGE, TL EMIN, D AF SAMARA, GA TARDY, HL VENTURINI, EL ASELAGE, TL EMIN, D TI AC HOPPING CONDUCTIVITIES, DIELECTRIC-CONSTANTS, AND REFLECTIVITIES OF BORON CARBIDES SO PHYSICAL REVIEW B LA English DT Article ID TEMPERATURE; SOLIDS AB The dielectric functions of several boron carbides with composition spanning the single-phase region (9.19 at. % C) have been measured over a broad range of frequencies (10(2)-10(15) Hz), making it possible to evaluate the various polarization contributions to the dielectric response. The high-frequency (electronic) contributions to the real part of the dielectric constants (E') are sizable (epsilon(infinity) congruent-to 7), whereas the lattice (ionic) contributions are small (epsilon(l)' less-than-or-equal-to 2). This result implies that the electron-lattice interaction in these materials is of short range, like that of covalent semiconductors. The low-frequency dielectric properties and ac conductivities are dominated by the hopping motion of localized charge carriers which are believed to be bipolaronic (paired) holes on B11C icosahedra. The frequency, temperature, and carbon-concentration dependences of these properties can be understood in terms of a recent model for adiabatic small-polaronic hopping between spatially close pairs of nearly degenerate sites. Distinctively, both the dielectric constant and conductivity exhibit peaks as a function of carbon content. This feature is consistent with a model that describes the evolution of the structure with increasing carbon content and results in peaking of the localized hole density at 13 1/3 at. % carbon. It is argued that the boron carbides are an ideal system for studying adiabatic small-polaron type hopping transport. RP SAMARA, GA (reprint author), SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. NR 22 TC 39 Z9 39 U1 0 U2 6 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 JUL 15 PY 1993 VL 48 IS 3 BP 1468 EP 1477 DI 10.1103/PhysRevB.48.1468 PG 10 WC Physics, Condensed Matter SC Physics GA LP050 UT WOS:A1993LP05000014 ER PT J AU HUANG, ZQ HUSSAIN, Z HUFF, WT MOLER, EJ SHIRLEY, DA AF HUANG, ZQ HUSSAIN, Z HUFF, WT MOLER, EJ SHIRLEY, DA TI STRUCTURAL DETERMINATION OF P2MG(2X1)CO/NI(110) WITH THE USE OF ANGLE-RESOLVED PHOTOEMISSION EXTENDED FINE-STRUCTURE SO PHYSICAL REVIEW B LA English DT Article ID RAY-PHOTOELECTRON DIFFRACTION; SURFACE-STRUCTURE; STRUCTURE SPECTROSCOPY; ADSORBATE-GEOMETRY; CARBON-MONOXIDE; NI(110) SURFACE; TILTED CO; SYSTEM; CHEMISORPTION; ADSORPTION AB The technique of angle-resolved photoemission extended fine structure has been used to study the chemisorption geometry of the dense p2mg(2 X 1)CO/Ni(110) overlayer at low temperatures. Photoemission intensities from the carbon ls core level were measured in three directions as a function of photoelectron kinetic energy in the range 60-400 eV. Using multiple-scattering spherical-wave (MSSW) modeling, we confirmed that the CO molecules form a zigzag-chain geometry on the Ni(I 10) surface at saturation coverage, with adjacent CO molecules along the [110BAR] direction displaced alternatively in opposite directions towards the [001] and the [001BAR] azimuths. We fur-ther determined that the CO molecules are adsorbed on the short-bridge sites, the tilt angle for the direction linking the carbon atom and the center of the nickel bridge being 16-degrees +/- 2-degrees from the surface normal. The carbon-nickel interatomic distance was determined to be 1.94 +/- 0.02 angstrom. The first- to second-layer spacing of nickel is 1. 27 +/- 0.04 angstrom, up from 1.10 angstrom for the clean Ni(110) surface, but close to the 1.25-angstrom Ni interlayer spacing in the bulk. Using the findings of earlier studies of this system, the C-0 bond length and tilt angle were varied within small ranges (1.10-1.20 angstrom and 15-degrees-23-degrees, respectively) in our MSSW simulations. At 1.16 angstrom and 19-degrees the best agreement between the experimental data and the theoretical simulations was achieved. The above results yield an 0-0 distance of 2.95 angstrom for the two nearest CO molecules, close to twice the van der Waals radius (approximately 1.5 angstrom) for oxygen. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. PENN STATE UNIV,DEPT CHEM,UNIV PK,PA 16802. PENN STATE UNIV,DEPT PHYS,UNIV PK,PA 16802. NR 42 TC 23 Z9 23 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 15 PY 1993 VL 48 IS 3 BP 1696 EP 1710 DI 10.1103/PhysRevB.48.1696 PG 15 WC Physics, Condensed Matter SC Physics GA LP050 UT WOS:A1993LP05000040 ER PT J AU OVERBURY, SH VANDENOETELAAR, RJA ZEHNER, DM AF OVERBURY, SH VANDENOETELAAR, RJA ZEHNER, DM TI SURFACE SEGREGATION IN MO0.75RE0.25(001) STUDIED BY LOW-ENERGY ALKALI-ION SCATTERING SO PHYSICAL REVIEW B LA English DT Article ID TRANSITION-METAL ALLOYS; PTXNI1-X(110); BEHAVIOR; MO(001) AB Mo0.75Re0.25(001) has been studied by low-energy alkali-ion scattering. Using a method based upon analysis of ion-scattering intensity ratios, the Re atom fractions in the first and second layers of this surface have been determined to be 0.040+/-0.005 and 0.52+/-0.05, respectively. From analysis of the critical edges the first interlayer spacing is found to be contracted by about 9%. These results are in excellent agreement with recent low-energy-electron-diffraction experiments. The results are described in terms of various theories of surface segregation, and are found to be in quite good agreement with the simplest models if the surface coordination is adjusted to that associated with a smoother, higher coordination surface. C1 EINDHOVEN UNIV TECHNOL,DEPT PHYS,5600 MB EINDHOVEN,NETHERLANDS. RP OVERBURY, SH (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Overbury, Steven/C-5108-2016 OI Overbury, Steven/0000-0002-5137-3961 NR 28 TC 30 Z9 30 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 15 PY 1993 VL 48 IS 3 BP 1718 EP 1725 DI 10.1103/PhysRevB.48.1718 PG 8 WC Physics, Condensed Matter SC Physics GA LP050 UT WOS:A1993LP05000042 ER PT J AU FAN, JD CAI, ZX REITER, G MOSS, SC AF FAN, JD CAI, ZX REITER, G MOSS, SC TI COMPUTER-SIMULATION STUDIES OF THE MELTING TRANSITION OF RB AND K-INTERCALATED IN GRAPHITE SO PHYSICAL REVIEW B LA English DT Article ID X-RAY DETERMINATION; MOLECULAR-DYNAMICS; PHASE-TRANSITIONS; LIQUID; SUBSTRATE; FLOW AB The energy histogram method, introduced by Ferrenberg and Swendsen [Phys. Rev. Lett. 61, 2635 (1988); 63, 1195 (1989)], was applied to the constant-temperature molecular-dynamics (MD) simulation of a two-dimensional system with incommensurate structures. We performed MD simulations for the stage-2 graphite intercalation compounds (GIC's) with Rb or K being the intercalants (Rb-GIC's and K-GIC's). The temperature dependence of the specific heat, C(v), is calculated for various sizes up to 864 atoms. The melting temperature was found to be 158 K for Rb-GIC's and 119 K for K-GIC's, which are in agreement with the experimental observations and an earlier MD result for Rb. C1 A&M COLL,BATON ROUGE,LA 70813. BROOKHAVEN NATL LAB,DIV MAT SCI,UPTON,NY 11973. UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. RP FAN, JD (reprint author), SOUTHERN UNIV,DEPT PHYS,BATON ROUGE,LA 70813, USA. NR 18 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 15 PY 1993 VL 48 IS 3 BP 1853 EP 1857 DI 10.1103/PhysRevB.48.1853 PG 5 WC Physics, Condensed Matter SC Physics GA LP050 UT WOS:A1993LP05000058 ER PT J AU WANG, XQ WANG, CZ HO, KM AF WANG, XQ WANG, CZ HO, KM TI 1ST-PRINCIPLES STUDY OF VIBRATIONAL-MODES IN ICOSAHEDRAL C(60) SO PHYSICAL REVIEW B LA English DT Article ID SCATTERING SPECTRUM; MOLECULAR-DYNAMICS; RAMAN-SCATTERING; C60; C-60; BUCKMINSTERFULLERENE; SUPERCONDUCTIVITY; FREQUENCIES; C70 AB The vibrational spectrum of the C60 molecule is calculated using first-principles density-functional theory. Our approach is based on a combination of the all-electron local-density functional method with group-theoretical analysis. The calculated vibrational frequencies of the icosahedral C60 molecule are found to be in excellent agreement with the experimental data available from Raman, infrared, and neutron inelastic-scattering measurements. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES LAB,AMES,IA 50011. RP WANG, XQ (reprint author), CLARK ATLANTA UNIV,CTR THEORET STUDIES PHYS SYST,ATLANTA,GA 30314, USA. NR 23 TC 59 Z9 60 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 JUL 15 PY 1993 VL 48 IS 3 BP 1884 EP 1887 DI 10.1103/PhysRevB.48.1884 PG 4 WC Physics, Condensed Matter SC Physics GA LP050 UT WOS:A1993LP05000063 ER PT J AU SINGH, PP GONIS, A AF SINGH, PP GONIS, A TI COHERENT-POTENTIAL APPROXIMATION IN THE TIGHT-BINDING LINEAR-MUFFIN-TIN-ORBITAL METHOD SO PHYSICAL REVIEW B LA English DT Note ID ELECTRONIC-STRUCTURE CALCULATIONS; ATOMIC-SPHERE APPROXIMATION; RECURSION METHOD; RANDOM ALLOYS; IMPURITIES AB We describe a consistent approach for applying the coherent-potential approximation (CPA) to the various representations of the linear muffin-tin orbital method. Unlike the previous works of Kudrnovsky et al. [Phys. Rev. B 35, 2487 (1987); 41, 7515 (1990)], our results for the ensemble-averaged Green functions in the tight-binding representation yield E- and r-dependent quantities that are consistent with the traditional applications of the single-site CPA. To illustrate the reliability and the usefulness of our approach we compare the nonspherically averaged charge densities, calculated in real space, of ordered NiPt in L1(0) structure and the substitutionally disordered Ni0.5Pt0.5 on a face-centered-cubic lattice. RP SINGH, PP (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,L-268,LIVERMORE,CA 94550, USA. NR 23 TC 6 Z9 6 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 15 PY 1993 VL 48 IS 3 BP 1989 EP 1992 DI 10.1103/PhysRevB.48.1989 PG 4 WC Physics, Condensed Matter SC Physics GA LP050 UT WOS:A1993LP05000089 ER PT J AU ZHAO, GL HARMON, BN AF ZHAO, GL HARMON, BN TI ELECTRON-PHONON INTERACTIONS AND THE PHONON ANOMALY IN BETA-PHASE NITI SO PHYSICAL REVIEW B LA English DT Article ID MEMORY ALLOY NITI; INTERMEDIATE PHASE; TRANSITION-METALS; EQUIATOMIC NITI; SHAPE-MEMORY; MARTENSITE; NI46.8TI50FE3.2; DISPERSION; TINI AB The electronic structure of beta-phase NiTi has been calculated using a first-principles linear-combination-of-atomic-orbitals method. The resulting band structure was fitted with a nonorthogonal tight-binding Hamiltonian from which electron-phonon matrix elements were evaluated. The soft phonon near Q0 = (2/3, 2/3, 0)pi/a, which is responsible for the premartensitic phase transition in beta-phase NiTi, is found to arise from the strong electron-phonon coupling of nested electronic states on the Fermi surface. Thermal vibrations and changes in electronic occupation cause a smearing of the nested features, which in tum cause a hardening of the phonon anomaly. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP ZHAO, GL (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 32 TC 77 Z9 80 U1 2 U2 13 PU AMERICAN 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 JUL 15 PY 1993 VL 48 IS 4 BP 2031 EP 2036 DI 10.1103/PhysRevB.48.2031 PG 6 WC Physics, Condensed Matter SC Physics GA LP540 UT WOS:A1993LP54000001 ER PT J AU MA, Y JOHNSON, PD WASSDAHL, N GUO, J SKYTT, P NORDGREN, J KEVAN, SD RUBENSSON, JE BOSKE, T EBERHARDT, W AF MA, Y JOHNSON, PD WASSDAHL, N GUO, J SKYTT, P NORDGREN, J KEVAN, SD RUBENSSON, JE BOSKE, T EBERHARDT, W TI ELECTRONIC-STRUCTURES OF ALPHA-FE2O3 AND FE3O4 FROM O K-EDGE ABSORPTION AND EMISSION-SPECTROSCOPY SO PHYSICAL REVIEW B LA English DT Article ID METAL-OXIDES; SPECTRA; DESIGN; FEXO AB We present O K-edge absorption and emission spectra for alpha-Fe2O3 and Fe3O4 obtained using a high-resolution-undulator soft-x-ray radiation source. The occupied and the unoccupied O p densities of states are obtained and compared with the valence-band photoemission results. While these results confirm that alpha-Fe2O3 can be classified as a charge transfer or an intermediate-type insulator, they suggest that Fe3O4 is more likely of the Mott-Hubbard type. The excitation-energy dependence of the emission spectra is also discussed. C1 UNIV WASHINGTON, DEPT PHYS, SEATTLE, WA 98195 USA. PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. UNIV UPPSALA, DEPT PHYS, S-75105 UPPSALA, SWEDEN. UNIV OREGON, DEPT PHYS, EUGENE, OR 97403 USA. FORSCHUNGSZENTRUM JULICH, INST FESTKORPERFORSCH, W-5170 JULICH 1, GERMANY. RI Kevan, Stephen/F-6415-2010 OI Kevan, Stephen/0000-0002-4621-9142 NR 12 TC 50 Z9 50 U1 1 U2 20 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 JUL 15 PY 1993 VL 48 IS 4 BP 2109 EP 2111 DI 10.1103/PhysRevB.48.2109 PG 3 WC Physics, Condensed Matter SC Physics GA LP540 UT WOS:A1993LP54000010 ER PT J AU BUTLER, WH GONIS, A ZHANG, XG AF BUTLER, WH GONIS, A ZHANG, XG TI BASIS FUNCTIONS FOR ARBITRARY CELLS IN MULTIPLE-SCATTERING THEORY SO PHYSICAL REVIEW B LA English DT Article ID NON-MUFFIN-TIN; ENERGY-BAND EQUATION; POTENTIALS; KORRINGA; ROSTOKER; KOHN; APPROXIMATION; SYSTEMS; SHAPE AB We present a formal and numerical study of the solutions of the Schrodinger equation associated with spatially bounded, but otherwise arbitrarily shaped potentials. We show that the scattering matrix (t-matrix), is sufficient to represent the solution everywhere outside the cell, not just outside a sphere bounding the cell. We also show that the basis function in the interior of the cell is independent of the potential surrounding the cell. We illustrate our formal results with the results of numerical calculations and discuss the implications of these results to multiple-scattering theory and to the calculation of the electronic structure of solids. C1 LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550. UNIV KENTUCKY,CTR COMPUTAT SCI,LEXINGTON,KY 40506. RP BUTLER, WH (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 51 TC 11 Z9 11 U1 1 U2 1 PU AMERICAN 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 JUL 15 PY 1993 VL 48 IS 4 BP 2118 EP 2130 DI 10.1103/PhysRevB.48.2118 PG 13 WC Physics, Condensed Matter SC Physics GA LP540 UT WOS:A1993LP54000012 ER PT J AU SINGH, PP GONIS, A AF SINGH, PP GONIS, A TI REAL-SPACE CALCULATIONS OF NONSPHERICALLY AVERAGED CHARGE-DENSITIES FOR SUBSTITUTIONALLY DISORDERED ALLOYS SO PHYSICAL REVIEW B LA English DT Article ID COHERENT-POTENTIAL-APPROXIMATION; ATOMIC-SPHERE APPROXIMATION; ORDERED METALLIC COMPOUNDS; ELECTRONIC-STRUCTURE; SELF-CONSISTENT; POINT-DEFECTS; IMPURITIES AB Based on screening transformations of muffin-tin orbitals introduced by Andersen and Jepsen [Phys. Rev. Lett. 53, 2571 (1984)], we have developed a formalism for calculating the nonspherically averaged charge densities of substitutionally disordered alloys using the Korringa-Kohn-Rostoker coherent-potential-approximation (KKR CPA) method in the atomic-sphere approximation (ASA). We have validated our method by calculating charge densities for ordered structures, where we find that our approach yields charge densities that are essentially indistinguishable from the results of full-potential methods. Calculations and comparisons are reported for Si, Al, and Li. For substitutionally disordered alloys, where full-potential methods have not been implemented so far, our approach can be used to calculate reliable nonspherically averaged charge densities from spherically symmetric one-electron potentials obtained from the KKR-ASA CPA. We report on our study of differences in charge density between ordered AlLi in the L1(0) phase and substitutionally disordered Al0.5Li0.5 on a face-centered-cubic lattice. RP SINGH, PP (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI L268,LIVERMORE,CA 94550, USA. NR 26 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 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD JUL 15 PY 1993 VL 48 IS 4 BP 2139 EP 2151 DI 10.1103/PhysRevB.48.2139 PG 13 WC Physics, Condensed Matter SC Physics GA LP540 UT WOS:A1993LP54000014 ER PT J AU LYO, SK AF LYO, SK TI THEORY OF MAGNETIC-FIELD-DEPENDENT ALLOY BROADENING OF EXCITON-PHOTOLUMINESCENCE LINEWIDTHS IN SEMICONDUCTOR ALLOYS SO PHYSICAL REVIEW B LA English DT Article ID RADIATIVE TRANSITIONS AB A theory is developed for the inhomogeneous photoluminescence line shape and, in particular, the linewidth of excitons due to alloy disorder in undoped semiconductor alloys in the presence of external magnetic fields. In contrast to previous theories, we find that both the linewidth and its field dependence depend not only on the exciton wave function for the electron-hole relative motion but also depend sensitively on the localization length R0 of the center-of-mass wave function. In general, the line shape depends on the nature of the exciton localization. The linewidths arise from the fluctuations of the conduction- and valence-band edges in the localization region where there is significant amplitude of the total exciton wave function. The wave function for the relative motion is calculated numerically by reducing the Schrodinger equation to a difference equation at arbitrary fields, while the center-of-mass wave function is treated phenomenologically. The linewidth is calculated as a function of the magnetic field and the localization length R0. The results yield good agreement with recent experimental data from In0.48Ga0.52P. RP LYO, SK (reprint author), SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. NR 16 TC 36 Z9 36 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JUL 15 PY 1993 VL 48 IS 4 BP 2152 EP 2161 DI 10.1103/PhysRevB.48.2152 PG 10 WC Physics, Condensed Matter SC Physics GA LP540 UT WOS:A1993LP54000015 ER PT J AU MITRA, S GLEASON, KK JIA, H SHINAR, J AF MITRA, S GLEASON, KK JIA, H SHINAR, J TI EFFECTS OF ANNEALING ON HYDROGEN MICROSTRUCTURE IN BORON-DOPED AND UNDOPED RF-SPUTTER-DEPOSITED AMORPHOUS-SILICON SO PHYSICAL REVIEW B LA English DT Article ID A-SI-H; MAGNETIC-RESONANCE; ALPHA-SI; RELAXATION; DIFFUSION; FILMS; METASTABILITY AB A detailed study of changes in hydrogen microstructure in rf-sputter-deposited undoped and boron-doped hydrogenated amorphous silicon was undertaken. The boron-doped samples were prepared under identical conditions with the same hydrogen content, and then characterized by IR absorption and H-1 NMR before and after annealing. It is found that an increase in the boron concentration leads to increased segregation of hydrogen. Annealing leads to evolution of the hydrogen microstructure. This change, however, depends on the boron content of the films. After a moderate anneal, the hydrogen microstructure is found to evolve to the same state and seems to be independent of the boron content of the films. C1 MIT,DEPT CHEM ENGN,CAMBRIDGE,MA 02139. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RI Gleason, Karen/G-1471-2013 OI Gleason, Karen/0000-0001-6127-1056 NR 34 TC 6 Z9 6 U1 1 U2 3 PU AMERICAN 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 JUL 15 PY 1993 VL 48 IS 4 BP 2175 EP 2182 DI 10.1103/PhysRevB.48.2175 PG 8 WC Physics, Condensed Matter SC Physics GA LP540 UT WOS:A1993LP54000018 ER PT J AU HUANT, S MANDRAY, A ZHU, J LOUIE, SG PANG, T ETIENNE, B AF HUANT, S MANDRAY, A ZHU, J LOUIE, SG PANG, T ETIENNE, B TI WELL-WIDTH DEPENDENCE OF D(-) CYCLOTRON-RESONANCE IN QUANTUM-WELLS SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC-FIELD; D-CENTERS; ENERGY-LEVELS; GAAS; STATES; NONPARABOLICITY; BINDING; MAGNETOEXCITONS; IDENTIFICATION; SUPERLATTICES AB Negative-donor (D- center) cyclotron resonance is studied in GaAs quantum wells of different widths to obtain information about the well-width dependence of the D- ground-state binding energy and optical transition energies in the range of 58-373 angstrom. The experimental magneto-optical transition energy is shown to increase with decreasing well width, in good agreement with variational quantum Monte Carlo results. C1 UNIV NEVADA, DEPT PHYS, RENO, NV 89557 USA. CNRS, F-38042 GRENOBLE 9, FRANCE. LAWRENCE BERKELEY LAB, DEPT PHYS, DIV MAT SCI, BERKELEY, CA 94720 USA. CNRS, MICROSTRUCT & MICROELECTR LAB, F-92225 BAGNEUX, FRANCE. RP MAX PLANCK INST FESTKORPERFORSCH, HIGH MAGNET FIELD LAB, W-7000 STUTTGART 1, GERMANY. RI Huant, Serge/F-4469-2010 NR 29 TC 32 Z9 33 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD JUL 15 PY 1993 VL 48 IS 4 BP 2370 EP 2375 DI 10.1103/PhysRevB.48.2370 PG 6 WC Physics, Condensed Matter SC Physics GA LP540 UT WOS:A1993LP54000038 ER PT J AU CHEN, XM CANTER, KF DUKE, CB PATON, A LESSOR, DL FORD, WK AF CHEN, XM CANTER, KF DUKE, CB PATON, A LESSOR, DL FORD, WK TI LOW-ENERGY POSITRON DIFFRACTION FROM THE (110) SURFACES OF GAAS AND INP SO PHYSICAL REVIEW B LA English DT Article ID ELECTRON-DIFFRACTION; CLEAVAGE FACES; LATTICE-VIBRATIONS; GAAS(110); CDSE; INTENSITIES; ANTIMONY; BISMUTH; CU(111) AB The intensities of 16 nonequivalent beams of normally incident positrons diffracted from the (110) surfaces of GaAs and InP are reported. The sample temperature was approximately 110 K. The intensities were measured over the energy range 30 eV less-than-or-equal-to E less-than-or-equal-to 200 eV. The atomic geometries of GaAs(110) and InP(110) were extracted from these intensities via their comparison with the predictions of a multiple-scattering model using the criterion of minimization of the x-ray R factor. The best-fit surface geometries resulting from these analyses are approximately bond-length-conserving top-layer and second-layer rotations characterized by the tilt angles (omega1 = 28.5-degrees+/-2.5-degrees, omega2 = -3.5-degrees+/-3-degrees) for GaAs(110) and (omega1 = 24.5-degrees+/-1.5-degrees, omega2 = -3.0-degrees+/-3-degrees) for InP(110). Comparable low-energy electron intensity data were obtained and analyzed for InP(110) leading to (omega1 = 31-degrees(-5-degrees)+3-degrees) and omega2 = -3-degrees+/-3-degrees). Small changes (DELTAd less-than-or-equal-to 0.07 angstrom) in the bond lengths associated with the top-layer species are characteristic of the best-fit structures, but of these, only a small contraction (DELTAd/d less-than-or-equal-to 3%) of the bond between the top-layer cation and second-layer anion seems likely to lie outside the uncertainties inherent in the analysis. C1 XEROX CORP, WEBSTER RES CTR, WEBSTER, NY 14580 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. MONTANA STATE UNIV, CTR ADV MAT, BOZEMAN, MT 59717 USA. MONTANA STATE UNIV, DEPT PHYS, BOZEMAN, MT 59717 USA. RP CHEN, XM (reprint author), BRANDEIS UNIV, MARTIN FISHER SCH PHYS, WALTHAM, MA 02254 USA. NR 42 TC 24 Z9 24 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD JUL 15 PY 1993 VL 48 IS 4 BP 2400 EP 2411 DI 10.1103/PhysRevB.48.2400 PG 12 WC Physics, Condensed Matter SC Physics GA LP540 UT WOS:A1993LP54000041 ER PT J AU FULLERTON, EE KUMAR, S GRIMSDITCH, M KELLY, DM SCHULLER, IK AF FULLERTON, EE KUMAR, S GRIMSDITCH, M KELLY, DM SCHULLER, IK TI X-RAY-DIFFRACTION CHARACTERIZATION AND SOUND-VELOCITY MEASUREMENTS OF W/NI MULTILAYERS SO PHYSICAL REVIEW B LA English DT Article ID COMPOSITION-MODULATED SUPERLATTICES; SOLID-STATE AMORPHIZATION; ELASTIC PROPERTIES; METALLIC SUPERLATTICES; FILMS; ANOMALIES; COHERENCY; BEHAVIOR; STRAIN; NICKEL AB We present detailed structural characterization and shear elastic constant measurements of sputtered W/Ni multilayers. Structural refinement of the reflection x-ray-diffraction spectra was used to determine the out-of-phase lattice spacings of the constituent layers. The Ni(111) lattice spacing expands almost-equal-to 3% and the W(110) lattice spacing is constant with decreasing modulation wavelength LAMDA down to LAMBDA almost-equal-to 30 angstrom. Transmission x-ray diffraction was used to determine the in-plane structure. The W layers undergo an anisotropic contraction in plane with the [002] directions contracting almost-equal-to 2% and the [110BAR] remaining constant with decreasing LAMBDA. The Ni [220BAR] expands almost-equal-to 1.5% with decreasing LAMBDA. The Ni layer expands both in plane and out of plane, contradicting Poisson ratio arguments relating in-plane and out-of-plane strains. Below LAMBDA = 35 angstrom the multilayers undergo a structural transition in which both layers transform into a random close-packed structure. The shear velocity decreases almost-equal-to 22% with decreasing LAMBDA down to the disorder transition and then is LAMBDA independent. The results imply that there is a correlation between the origin of the elastic anomalies and amorphization. C1 UNIV CALIF SAN DIEGO,DEPT PHYS 0319,LA JOLLA,CA 92093. RP FULLERTON, EE (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Fullerton, Eric/H-8445-2013 OI Fullerton, Eric/0000-0002-4725-9509 NR 36 TC 18 Z9 19 U1 1 U2 5 PU AMERICAN 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 JUL 15 PY 1993 VL 48 IS 4 BP 2560 EP 2567 DI 10.1103/PhysRevB.48.2560 PG 8 WC Physics, Condensed Matter SC Physics GA LP540 UT WOS:A1993LP54000059 ER PT J AU AGER, JW DRORY, MD AF AGER, JW DRORY, MD TI QUANTITATIVE MEASUREMENT OF RESIDUAL BIAXIAL STRESS BY RAMAN-SPECTROSCOPY IN DIAMOND GROWN ON A TI ALLOY BY CHEMICAL-VAPOR-DEPOSITION SO PHYSICAL REVIEW B LA English DT Article ID UNIAXIAL STRESS; FILMS; SILICON; ISSUES; PHONON; GAAS; CVD AB Raman spectroscopy is used to study residual stress in diamond grown on Ti-6Al-4V by chemical vapor deposition. A general model is developed to use Raman spectroscopy to measure biaxial stress in polycrystalline, diamond-structure films. The as-grown film has 7.1 GPa of residual compressive stress, consistent with the difference in thermal-expansion coefficients between the diamond film and the substrate. Examination of the Raman spectra of the film in the vicinity of Brale indentations reveals that residual stresses in the film of up to approximately 17 GPa can be accommodated in the film before delamination occurs. C1 CRYSTALLUME,MENLO PK,CA 94025. 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 29 TC 282 Z9 287 U1 5 U2 44 PU AMERICAN 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 JUL 15 PY 1993 VL 48 IS 4 BP 2601 EP 2607 DI 10.1103/PhysRevB.48.2601 PG 7 WC Physics, Condensed Matter SC Physics GA LP540 UT WOS:A1993LP54000064 ER PT J AU JESINA, A TRINGIDES, MC AF JESINA, A TRINGIDES, MC TI DISORDERING KINETICS IN SURFACE OVERLAYERS SO PHYSICAL REVIEW B LA English DT Article ID CHEMISORBED OVERLAYER; GROWTH-KINETICS; HIGH COVERAGE; RECONSTRUCTION; DIFFUSION; O/W(110); DYNAMICS; OXYGEN AB The disordering kinetics of the O/W(110)-p(2X1)+p(2X2) overlayer, prepared initially in a well-ordered state, are studied with low-energy electron diffraction profile analysis. The decay of the peak intensity, used as a measure of the growing disorder, cannot be fitted to a power law as in the case of ordering processes. The full width at half maximum of the time-dependent structure factor S(q,t) is constant with time, which suggests that the average size remains constant. Diffusion activation energy extracted for the temperature dependence of the disordering is 1.0+/-0.05 eV, which is different from the value of 0.6 eV measured in ordering processes. The difference can be explained by the adsorbate-adsorbate interactions, which contribute differently to the diffusion barrier, in the two experiments. RP JESINA, A (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES LAB,AMES,IA 50011, USA. NR 15 TC 8 Z9 8 U1 0 U2 2 PU AMERICAN 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 JUL 15 PY 1993 VL 48 IS 4 BP 2694 EP 2698 DI 10.1103/PhysRevB.48.2694 PG 5 WC Physics, Condensed Matter SC Physics GA LP540 UT WOS:A1993LP54000076 ER PT J AU LIN, KC TOBIN, RG DUMAS, P HIRSCHMUGL, CJ WILLIAMS, GP AF LIN, KC TOBIN, RG DUMAS, P HIRSCHMUGL, CJ WILLIAMS, GP TI ADSORBATE-INDUCED CHANGES IN THE INFRARED REFLECTANCE AND RESISTIVITY OF METALS SO PHYSICAL REVIEW B LA English DT Note ID SURFACE RESISTIVITY; SPECTROSCOPY; RECONSTRUCTION; CU(100); OPTICS; FILMS; CO AB We present an experimental test of a predicted relationship between adsorbate-induced changes in the infrared reflectance and dc resistivity of a metal. We have measured the absolute change in reflectance for O and CO on Cu(100) and for CO on Ni(100) over the frequency range 300-2000 cm-1 and compared it with published resistivity changes for the corresponding thin-film systems. For the two adsorbates on Cu the results are consistent with a simple model based on scattering of conduction electrons by the adsorbate. For CO on Ni, however, the reflectance change is much smaller than predicted. C1 MICHIGAN STATE UNIV,DEPT PHYS & ASTRON,E LANSING,MI 48824. MICHIGAN STATE UNIV,CTR FUNDAMENTAL MAT RES,E LANSING,MI 48824. CTR UNIV PARIS SUD,UTILISAT RAYONNEMENT ELECTROMAGNET LAB,F-91405 ORSAY,FRANCE. CNRS,SPECTROCHIM INFRAROUGE & RAMAN LAB,F-94320 THIAIS,FRANCE. YALE UNIV,DEPT APPL PHYS,NEW HAVEN,CT 06520. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. OI Lin, King-Chuen/0000-0002-4933-7566 NR 30 TC 37 Z9 38 U1 0 U2 1 PU AMERICAN 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 JUL 15 PY 1993 VL 48 IS 4 BP 2791 EP 2794 DI 10.1103/PhysRevB.48.2791 PG 4 WC Physics, Condensed Matter SC Physics GA LP540 UT WOS:A1993LP54000092 ER PT J AU MATERER, N BARBIERI, A GARDIN, D STARKE, U BATTEAS, JD VANHOVE, MA SOMORJAI, GA AF MATERER, N BARBIERI, A GARDIN, D STARKE, U BATTEAS, JD VANHOVE, MA SOMORJAI, GA TI HOLLOW-SITE MOLECULAR ADSORPTION FOR NO ON PT(111) AND NI(111) - INVALIDATING VIBRATIONAL SITE ASSIGNMENT RULES SO PHYSICAL REVIEW B LA English DT Note ID ENERGY-ELECTRON-DIFFRACTION; SURFACE-STRUCTURE; LEED ANALYSIS; NITRIC-OXIDE; HREELS; ABSORPTION; OXYGEN; STATES; CO AB Dynamical low-energy electron diffraction analyses of ordered structures of NO molecules chemisorbed on Pt(111) and on Ni(111) conclusively yield threefold-coordinated hollow-site adsorption, and reasonable bond lengths. This invalidates long-standing site assignments based on vibrational measurements, calling that approach into question. The results of this study also contrast with the lower-coordinated bridge and top sites found for CO molecules on the same metal surfaces. The NO molecules are oriented close to the surface normal, O end up. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP MATERER, N (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Van Hove, Michel/A-9862-2008; Batteas, James/D-4144-2015 OI Van Hove, Michel/0000-0002-8898-6921; Batteas, James/0000-0002-6244-5000 NR 34 TC 82 Z9 82 U1 1 U2 8 PU AMERICAN 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 JUL 15 PY 1993 VL 48 IS 4 BP 2859 EP 2861 DI 10.1103/PhysRevB.48.2859 PG 3 WC Physics, Condensed Matter SC Physics GA LP540 UT WOS:A1993LP54000109 ER PT J AU CARR, BJ LIDSEY, JE AF CARR, BJ LIDSEY, JE TI PRIMORDIAL BLACK-HOLES AND GENERALIZED CONSTRAINTS ON CHAOTIC INFLATION SO PHYSICAL REVIEW D LA English DT Article ID DIFFERENTIAL MICROWAVE RADIOMETER; REDSHIFT-DISTANCE SAMPLES; LARGE-SCALE STRUCTURE; COLD DARK MATTER; EXTENDED INFLATION; GRAVITATIONAL-WAVES; POWER-LAW; BACKGROUND ANISOTROPY; DENSITY-FLUCTUATIONS; UNIVERSE AB It is argued that the main quantity of interest in chaotic inflation is the cosmological expansion rate H expressed as a function of the inflaton field phi. We derive a general prescription for realizing successful inflation in terms of a set of constraints on this function. The formalism is valid for all chaotic inflationary models based on a single scalar field which is minimally coupled to general relativity, so no restrictions on the dynamics of the field are necessary. This technique is used to investigate the possibility ty that primordial black holes (PBH's) may arise due to adiabatic quantum fluctuations in the inflaton. PBH formation can only be interesting if the amplitude of the fluctuations decreases with increasing mass scale and this is only possible if the field is accelerating or decelerating sufficiently fast. In this case, limits on the number of PBH's place very interesting constraints on the form of H(phi) since, together with the COBE measurement, they restrict the spectrum of fluctuations over 45 decades of mass. This corresponds to 35 e-foldings of inflationary expansion. If the amplitude of the fluctuations decreases as a power of mass, which is the most interesting situation, then H(phi) must have a trigonometric form and this allows the constraints to be expressed very simply. C1 FERMILAB NATL ACCELERATOR LAB,FERMILAB ASTROPHYS CTR,NASA,BATAVIA,IL 60510. RP CARR, BJ (reprint author), SCH MATH SCI,ASTRON UNIT,MILE END RD,LONDON E1 4NS,ENGLAND. NR 71 TC 104 Z9 104 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 JUL 15 PY 1993 VL 48 IS 2 BP 543 EP 553 DI 10.1103/PhysRevD.48.543 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LN084 UT WOS:A1993LN08400010 ER PT J AU KENMOKU, M OKAMOTO, Y SHIGEMOTO, K AF KENMOKU, M OKAMOTO, Y SHIGEMOTO, K TI GENERALIZED EINSTEIN THEORY ON SOLAR AND GALACTIC SCALES SO PHYSICAL REVIEW D LA English DT Article ID ROTATION CURVES; GRAVITY; UNIVERSE; GALAXIES; MATTER AB We study a generalized Einstein theory with the following two criteria: (i) on the solar scale, it must be consistent with the classical tests of general relativity, (ii) on the galactic scale, the gravitational potential is a sum of Newtonian and Yukawa potentials so that it may explain the flat rotation curves of spiral galaxies. Under these criteria we find that such a generalized Einstein action must include at least one scalar field and one vector field as well as the quadratic term of the scalar curvature. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. TEZUKAYAMA GAKUIN UNIV,DEPT PHYS,NARA 631,JAPAN. RP KENMOKU, M (reprint author), NARA WOMENS UNIV,DEPT PHYS,NARA 630,JAPAN. NR 18 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 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 15 PY 1993 VL 48 IS 2 BP 578 EP 582 DI 10.1103/PhysRevD.48.578 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LN084 UT WOS:A1993LN08400015 ER PT J AU MAIA, MD SILVEIRA, V AF MAIA, MD SILVEIRA, V TI WINDOW TO EXTRA DIMENSIONS NEAR A BLACK-HOLE SO PHYSICAL REVIEW D LA English DT Note AB A version of the Rubakov-Shaposhnikov high-dimensional model is implemented. Particles are assumed to be confined to a four-dimensional submanifold of a high-dimensional space via an ad hoc potential barrier based on the four-dimensional gravitational field strength. The analogue of the Schwarzschild back hole has a window into the higher-dimensional space, located near where the event horizon would have been. C1 FERMILAB NATL ACCELERATOR LAB,FERMILAB ASTROPHYS CTR,NASA,BATAVIA,IL 60510. UNIV BRASILIA,DEPT FIS,BR-70919 BRASILIA,DF,BRAZIL. RP MAIA, MD (reprint author), UNIV BRASILIA,DEPT MATEMAT,BR-70919 BRASILIA,DF,BRAZIL. OI maia, marcos/0000-0003-0094-7686 NR 20 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 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JUL 15 PY 1993 VL 48 IS 2 BP 954 EP 957 DI 10.1103/PhysRevD.48.954 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LN084 UT WOS:A1993LN08400060 ER PT J AU ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECHTLUFT, J BECKER, R BECKER, U BEHNER, F BEHRENS, J BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCK, R BOHM, A BORGIA, B BOSETTI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUJAK, A BURGER, JD BURGER, WJ BUSENITZ, J BUYTENHUIJS, A CAI, XD CAPELL, M CARIA, M CARLINO, G CARTACCI, AM CASTELLO, R CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, M CHEN, WY CHIEFARI, G CHIEN, CY CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DJAMBAZOV, L DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREDJ, L FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HARTMANN, B HASAN, A HAUSCHILDT, D HE, CF HE, JT HEBBEKER, T HEBERT, M HERTEN, G HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, A KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KLOCKNER, R KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBEDEV, A LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LEYTENS, X LI, C LI, HT LI, PJ LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALE, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H QI, ZD QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RODRIGUEZ, FJ ROE, BP ROHNER, M ROMERO, L ROSIERLEES, S ROSMALEN, R ROSSELET, P VANROSSUM, W ROTH, S RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SON, D SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUN, LZ SUSINNO, GF SUTER, H SWAIN, JD SYED, AA TANG, XW TAYLOR, L TERZI, G TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, C WANG, CR WANG, GH WANG, XL WANG, YF WANG, ZM WARNER, C WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYNHOFF, S WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZHENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC AF ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECHTLUFT, J BECKER, R BECKER, U BEHNER, F BEHRENS, J BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCK, R BOHM, A BORGIA, B BOSETTI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUJAK, A BURGER, JD BURGER, WJ BUSENITZ, J BUYTENHUIJS, A CAI, XD CAPELL, M CARIA, M CARLINO, G CARTACCI, AM CASTELLO, R CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, M CHEN, WY CHIEFARI, G CHIEN, CY CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DJAMBAZOV, L DOVA, MT DRAGO, E DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREDJ, L FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HARTMANN, B HASAN, A HAUSCHILDT, D HE, CF HE, JT HEBBEKER, T HEBERT, M HERTEN, G HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, A KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KLOCKNER, R KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBEDEV, A LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LEYTENS, X LI, C LI, HT LI, PJ LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALE, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H QI, ZD QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RODRIGUEZ, FJ ROE, BP ROHNER, M ROMERO, L ROSIERLEES, S ROSMALEN, R ROSSELET, P VANROSSUM, W ROTH, S RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SON, D SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUN, LZ SUSINNO, GF SUTER, H SWAIN, JD SYED, AA TANG, XW TAYLOR, L TERZI, G TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, C WANG, CR WANG, GH WANG, XL WANG, YF WANG, ZM WARNER, C WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYNHOFF, S WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZHENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC TI DETERMINATION OF THE EFFECTIVE ELECTROWEAK MIXING ANGLE FROM Z-DECAYS SO PHYSICS LETTERS B LA English DT Article AB The effective electroweak mixing angle sin2 theta(w)BAR is measured from the production and decay of the Z boson in e+ e-interactions. The data sample corresponds to an integrated luminosity of 18 pb-1 with about 420 000 hadronic and 40000 leptonic Z decays. The mixing angle sin2 theta(w)BAR is determined from several independent measurements: the leptonic and hadronic cross sections, the forward-backward asymmetries of charged leptons and b-quarks, and the tau-polarization. The results are found to be in good agreement with each other. The value of sin2 theta(w)BAR from a fit to the asymmetries in a model independent method is 0.2321+/-0.0021 and from a global fit to the data in the Standard Model framework is 0.2328+/-0.0013. C1 UNIV FLORENCE, I-50125 FLORENCE, ITALY. RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 3, W-5100 AACHEN, GERMANY. NIKHEF, 1009 DB AMSTERDAM, NETHERLANDS. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. LAPP, CNRS, IN2P3, F-74941 ANNECY LE VIEUX, FRANCE. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. IHEP, BEIJING 100039, PEOPLES R CHINA. INFN, I-40126 BOLOGNA, ITALY. TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA. BOSTON UNIV, BOSTON, MA 02215 USA. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY. HARVARD UNIV, CAMBRIDGE, MA 02139 USA. MIT, CAMBRIDGE, MA 02139 USA. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. CHINESE UNIV SCI & TECHNOL, HEFEI 230029, PEOPLES R CHINA. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. UNIV LYON 1, INST PHYS NUCL LYON, CNRS, IN2P3, F-69622 VILLEURBANNE, FRANCE. CIEMAT, E-28040 MADRID, SPAIN. INFN, I-20133 MILAN, ITALY. ITEP, MOSCOW, RUSSIA. INFN, I-80125 NAPLES, ITALY. UNIV NAPLES, I-80125 NAPLES, ITALY. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV NYMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. NATL INST NUCL PHYS & HIGH ENERGY PHYS, 6525 ED NIJMEGEN, NETHERLANDS. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. CALTECH, PASADENA, CA 91125 USA. INFN, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. PRINCETON UNIV, PRINCETON, NJ 08544 USA. INFN, I-00185 ROME, ITALY. UNIV ROMA LA SAPIENZA, I-00185 ROME, ITALY. ST PETERSBURG NUCL PHYS INST, ST PETERSBURG, RUSSIA. UNIV CALIF SAN DIEGO, LA JOLLA, CA 92093 USA. UNIV SANTIAGO, DEPT FIS PARTICULAS ELEMENTALES, E-15706 SANTIAGO, SPAIN. SIC, SHANGHAI, PEOPLES R CHINA. BULGARIAN ACAD SCI, INST MECHATRON, BU-1113 SOFIA, BULGARIA. KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, TAEJON 305701, SOUTH KOREA. UNIV ALABAMA, UNIVERSITY, AL 35486 USA. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. PSI, CH-5232 VILLIGEN, SWITZERLAND. DESY, INST HOCHENERGIEPHYS, O-1615 ZEUTHEN, GERMANY. SWISS FED INST TECHNOL, CH-8093 ZURICH, SWITZERLAND. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. RP ADRIANI, O (reprint author), INFN, I-50125 FLORENCE, ITALY. RI Fiandrini, Emanuele/C-4549-2008; Berdugo, Javier/A-2858-2015; Leijtens, Xaveer/F-3302-2010; Lista, Luca/C-5719-2008; Ludovici, Lucio/F-5917-2011; Servoli, Leonello/E-6766-2012; bertucci, bruna/J-5237-2012; Cerrada, Marcos/J-6934-2014; Gonzalez Romero, Enrique/L-7561-2014; Vogel, Helmut/N-8882-2014; Ferguson, Thomas/O-3444-2014; van der Zwaan, Bob/F-4070-2015; D'Alessandro, Raffaello/F-5897-2015; Duran, Ignacio/H-7254-2015; rodriguez calonge, francisco javier/H-9682-2015; Rancoita, Pier Giorgio/J-9896-2015; Hoorani, Hafeez/D-1791-2013; Arce, Pedro/L-1268-2014; Roth, Stefan/J-2757-2016; Tsaregorodtsev, Andrei/E-3873-2016; OI Berdugo, Javier/0000-0002-7911-8532; Leijtens, Xaveer/0000-0001-7794-8236; Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920; Vogel, Helmut/0000-0002-6109-3023; Ferguson, Thomas/0000-0001-5822-3731; van der Zwaan, Bob/0000-0001-5871-7643; D'Alessandro, Raffaello/0000-0001-7997-0306; Rancoita, Pier Giorgio/0000-0002-1990-4283; Arce, Pedro/0000-0003-3009-0484; Roth, Stefan/0000-0003-3616-2223; Tsaregorodtsev, Andrei/0000-0003-4618-520X; Longo, Egidio/0000-0001-6238-6787; Ambrosi, Giovanni/0000-0001-6977-9559; Diemoz, Marcella/0000-0002-3810-8530; Bertucci, Bruna/0000-0001-7584-293X NR 32 TC 4 Z9 4 U1 2 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD JUL 15 PY 1993 VL 309 IS 3-4 BP 451 EP 462 DI 10.1016/0370-2693(93)90961-G PG 12 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LM146 UT WOS:A1993LM14600037 ER PT J AU ADAMS, MR AID, S ANTHONY, PL BAKER, MD BARTLETT, J BHATTI, AA BRAUN, HM BUSZA, W CARROLL, TJ CONRAD, JM COUTRAKON, G DAVISSON, R DERADO, I DHAWAN, SK DOUGHERTY, W DREYER, T DZIUNIKOWSKA, K ECKARDT, V ECKER, U ERDMANN, M ESKREYS, A FIGIEL, J GEBAUER, HJ GEESAMAN, DF GILMAN, R GREEN, MC HAAS, J HALLIWELL, C HANLON, J HANTKE, D HUGHES, VW JACKSON, HE JAFFE, DE JANCSO, G JANSEN, DM KAUFMAN, S KENNEDY, RD KIRK, T KOBRAK, HGE KRZYWDZINSKI, S KUNORI, S LORD, JJ LUBATTI, HJ MCLEOD, D MAGILL, S MALECKI, P MANZ, A MELANSON, H MICHAEL, DG MOHR, W MONTGOMERY, HE MORFIN, JG NICKERSON, RB ODAY, S OLKIEWICZ, K OSBORNE, L PAPAVASSILIOU, V PAWLIK, B PIPKIN, FM RAMBERG, EJ ROSER, A RYAN, JJ SALVARANI, A SCHELLMAN, H SCHMITT, M SCHMITZ, N SCHULER, KP SEYERLEIN, HJ SKUJA, A SNOW, GA SOLDNERREMBOLD, S STEINBERG, PH STIER, HE STOPA, P SWANSON, RA TALAGA, R TENTINDOREPOND, S TROST, HJ VENKATARAMANIA, H VIDAL, M WILHELM, M WILKES, J WILSON, R WITTEK, W WOLBERS, SA ZHAO, T AF ADAMS, MR AID, S ANTHONY, PL BAKER, MD BARTLETT, J BHATTI, AA BRAUN, HM BUSZA, W CARROLL, TJ CONRAD, JM COUTRAKON, G DAVISSON, R DERADO, I DHAWAN, SK DOUGHERTY, W DREYER, T DZIUNIKOWSKA, K ECKARDT, V ECKER, U ERDMANN, M ESKREYS, A FIGIEL, J GEBAUER, HJ GEESAMAN, DF GILMAN, R GREEN, MC HAAS, J HALLIWELL, C HANLON, J HANTKE, D HUGHES, VW JACKSON, HE JAFFE, DE JANCSO, G JANSEN, DM KAUFMAN, S KENNEDY, RD KIRK, T KOBRAK, HGE KRZYWDZINSKI, S KUNORI, S LORD, JJ LUBATTI, HJ MCLEOD, D MAGILL, S MALECKI, P MANZ, A MELANSON, H MICHAEL, DG MOHR, W MONTGOMERY, HE MORFIN, JG NICKERSON, RB ODAY, S OLKIEWICZ, K OSBORNE, L PAPAVASSILIOU, V PAWLIK, B PIPKIN, FM RAMBERG, EJ ROSER, A RYAN, JJ SALVARANI, A SCHELLMAN, H SCHMITT, M SCHMITZ, N SCHULER, KP SEYERLEIN, HJ SKUJA, A SNOW, GA SOLDNERREMBOLD, S STEINBERG, PH STIER, HE STOPA, P SWANSON, RA TALAGA, R TENTINDOREPOND, S TROST, HJ VENKATARAMANIA, H VIDAL, M WILHELM, M WILKES, J WILSON, R WITTEK, W WOLBERS, SA ZHAO, T TI MEASUREMENT OF THE RATIO SIGMA(N)/SIGMA(P) IN INELASTIC MUON-NUCLEON SCATTERING AT VERY-LOW X AND Q(2) SO PHYSICS LETTERS B LA English DT Article ID CROSS-SECTIONS; NEUTRON AB We present results on the cross-section ratio for inelastic muon scattering on neutrons and protons as a function of Bjorken x. The data extend to x values two orders of magnitude smaller than in previous measurements, down to 2 x 10(-5), for Q2 > 0.01 GeV2. The ratio is consistent with unity throughout this new range. C1 UNIV MARYLAND,COLL PK,MD 20742. MIT,CAMBRIDGE,MA 02139. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV WASHINGTON,SEATTLE,WA 98195. UNIV GESAMTHSCH WUPPERTAL,W-5600 WUPPERTAL 1,GERMANY. HARVARD UNIV,CAMBRIDGE,MA 02138. MAX PLANCK INST PHYS & ASTROPHYS,MUNICH,GERMANY. YALE UNIV,NEW HAVEN,CT 06520. UNIV FREIBURG,W-7800 FREIBURG,GERMANY. STANISLAW STASZIC UNIV MIN & MET,INST NUCL PHYS,PL-30059 KRAKOW,POLAND. INST NUCL PHYS,PL-31342 KRAKOW,POLAND. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. NORTHWESTERN UNIV,EVANSTON,IL 60208. RP ADAMS, MR (reprint author), UNIV ILLINOIS,CHICAGO,IL 60680, USA. RI Carroll, Timothy/B-6934-2009 NR 20 TC 11 Z9 11 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 JUL 15 PY 1993 VL 309 IS 3-4 BP 477 EP 482 DI 10.1016/0370-2693(93)90964-J PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LM146 UT WOS:A1993LM14600040 ER PT J AU KODAMA, K USHIDA, N MOKHTARANI, A PAOLONE, VS VOLK, JT WILCOX, JO YAGER, PM EDELSTEIN, RM FREYBERGER, AP GIBAUT, DB LIPTON, RJ NICHOLS, WR POTTER, DM RUSS, JS ZHANG, C ZHANG, Y JANG, HI KIM, JY KIM, TI LIM, IT PAC, MY BALLER, BR STEFANSKI, RJ NAKAZAWA, K CHUNG, KS CHUNG, SH KIM, DC PARK, IG PARK, MS SONG, JS YOON, CS CHIKAWA, M ABE, T FUJII, T FUJIOKA, G FUJIWARA, K FUKUSHIMA, H HARA, T TAKAHASHI, Y TARUMA, K TSUZUKI, Y YOKOYAMA, C CHANG, SD CHEON, BG CHO, JH KANG, JS KIM, CO KIM, KY KIM, TY LEE, JC LEE, SB LIM, GY NAM, SW SHIN, TS SIM, KS WOO, JK ISOKANE, Y TSUNEOKA, Y AOKI, S GAUTHIER, A HOSHINO, K KITAMURA, H KOBAYASHI, M MIYANISHI, M NAKAMURA, K NAKAMURA, M NAKAMURA, Y NAKANISHI, S NIU, K NIWA, K NOMURA, M TAJIMA, H YOSHIDA, S ARYAL, M DUNLEA, JM FREDERIKSEN, SG KURAMATA, S LUNDBERG, BG OLEYNIK, GA REAY, NW REIBEL, K SIDWELL, RA STANTON, NR MORIYAMA, K SHIBATA, H KALBFLEISCH, GR SKUBIC, P SNOW, JM WILLIS, SE KUSUMOTO, O NAKAMURA, K OHASHI, S OKUSAWA, T TERANAKA, M TOMINAGA, T YOSHIDA, T YUUKI, H OKABE, H YOKOTA, J ADACHI, M IKEGAMI, I KAZUNO, M NIU, E SHIBUYA, H WATANABE, S SATO, Y SESHIMO, M TEZUKA, I BAHK, SY KIM, SK AF KODAMA, K USHIDA, N MOKHTARANI, A PAOLONE, VS VOLK, JT WILCOX, JO YAGER, PM EDELSTEIN, RM FREYBERGER, AP GIBAUT, DB LIPTON, RJ NICHOLS, WR POTTER, DM RUSS, JS ZHANG, C ZHANG, Y JANG, HI KIM, JY KIM, TI LIM, IT PAC, MY BALLER, BR STEFANSKI, RJ NAKAZAWA, K CHUNG, KS CHUNG, SH KIM, DC PARK, IG PARK, MS SONG, JS YOON, CS CHIKAWA, M ABE, T FUJII, T FUJIOKA, G FUJIWARA, K FUKUSHIMA, H HARA, T TAKAHASHI, Y TARUMA, K TSUZUKI, Y YOKOYAMA, C CHANG, SD CHEON, BG CHO, JH KANG, JS KIM, CO KIM, KY KIM, TY LEE, JC LEE, SB LIM, GY NAM, SW SHIN, TS SIM, KS WOO, JK ISOKANE, Y TSUNEOKA, Y AOKI, S GAUTHIER, A HOSHINO, K KITAMURA, H KOBAYASHI, M MIYANISHI, M NAKAMURA, K NAKAMURA, M NAKAMURA, Y NAKANISHI, S NIU, K NIWA, K NOMURA, M TAJIMA, H YOSHIDA, S ARYAL, M DUNLEA, JM FREDERIKSEN, SG KURAMATA, S LUNDBERG, BG OLEYNIK, GA REAY, NW REIBEL, K SIDWELL, RA STANTON, NR MORIYAMA, K SHIBATA, H KALBFLEISCH, GR SKUBIC, P SNOW, JM WILLIS, SE KUSUMOTO, O NAKAMURA, K OHASHI, S OKUSAWA, T TERANAKA, M TOMINAGA, T YOSHIDA, T YUUKI, H OKABE, H YOKOTA, J ADACHI, M IKEGAMI, I KAZUNO, M NIU, E SHIBUYA, H WATANABE, S SATO, Y SESHIMO, M TEZUKA, I BAHK, SY KIM, SK TI A STUDY OF THE SEMIMUONIC DECAYS OF THE D(S) SO PHYSICS LETTERS B LA English DT Article ID BRANCHING FRACTION AB We present a study of the Cabibbo-allowed semimuonic decay modes of the D(S)+ produced in 600 GeV/c pi--emulsion interactions. From a signal of 18.7 +/- 4.9(-0.7)+0.4 events in the D(S)+ --> phimu+nu channel, the product of production cross section and partial width is measured with respect to that for D+ --> K*0BAR mu+nu to be (sigma(D(S)+)/sigma(D+)). (GAMMA(D(S)+ --> phimu+nu)GAMMA(D+ --> K*0BAR mu+nu)) = 0.56 +/- 0.14 +/- 0.12. The form factor ratios in the decay, obtained by fitting to the decay angles and q2, are A2(0)/A1(0) = 2.1(-0.5)+0.6 +/- 0.2 and V(0) = 2.3(-0.9)+1.1 +/- 0.4, where A1(0) and A2(0) are the axial vector form factors and V(0) is the vector form factor, evaluated at q2 = 0. The first observation of D(S)+ --> (etamu+nu + eta'mu+nu) is also reported, and GAMMA(D(S)+ --> (etamu+nu + eta'mu+nu))/GAMMA(D(S)+ --> phimu+nu) is determined to be 3.9 +/- 1.6. C1 UNIV CALIF DAVIS,DAVIS,CA 95616. CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. CHONNAM NATL UNIV,KWANGJU 500757,SOUTH KOREA. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. GIFU UNIV,GIFU 50111,JAPAN. GYEONGSANG NATL UNIV,JINJU 660300,SOUTH KOREA. KINKI UNIV,OSAKA,OSAKA 577,JAPAN. KOBE UNIV,KOBE 657,JAPAN. KOREA UNIV,SEOUL 136701,SOUTH KOREA. NAGOYA INST TECHNOL,NAGOYA,AICHI 466,JAPAN. NAGOYA UNIV,NAGOYA,AICHI 464,JAPAN. OHIO STATE UNIV,COLUMBUS,OH 43210. OKAYAMA UNIV,OKAYAMA 700,JAPAN. UNIV OKLAHOMA,NORMAN,OK 73019. OSAKA CITY UNIV,OSAKA 558,JAPAN. SCI EDUC INST OSAKA PREFECTURE,OSAKA 558,JAPAN. TOHO UNIV,FUNABASHI,CHIBA 274,JAPAN. UTSUNOMIYA UNIV,UTSUNOMIYA,TOCHIGI 321,JAPAN. WONKWANG UNIV,IRI 570749,SOUTH KOREA. RP KODAMA, K (reprint author), AICHI UNIV EDUC,KARIYA 448,JAPAN. RI Russ, James/P-3092-2014; Aoki, Shigeki/L-6044-2015 OI Russ, James/0000-0001-9856-9155; NR 20 TC 29 Z9 29 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUL 15 PY 1993 VL 309 IS 3-4 BP 483 EP 491 DI 10.1016/0370-2693(93)90965-K PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LM146 UT WOS:A1993LM14600041 ER PT J AU AMEMIYA, CT OHTA, Y LITMAN, RT RAST, JP HAIRE, RN LITMAN, GW AF AMEMIYA, CT OHTA, Y LITMAN, RT RAST, JP HAIRE, RN LITMAN, GW TI V(H)GENE ORGANIZATION IN A RELICT SPECIES, THE COELACANTH LATIMERIA-CHALUMNAE - EVOLUTIONARY IMPLICATIONS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE SEGMENTAL ELEMENTS; DIVERSITY SEGMENT; GENOMIC LIBRARY; MOLECULAR PHYLOGENY ID IMMUNOGLOBULIN GENE ORGANIZATION; HEAVY-CHAIN GENE; VH-GENE; PRIMITIVE VERTEBRATE; GENOMIC ORGANIZATION; NUCLEOTIDE-SEQUENCE; XENOPUS-LAEVIS; RAJA-ERINACEA; DNA; SEGMENTS AB The living coelacanth Latimeria chalumnae is a relict species whose higher-level phylogenetic relationships have not been resolved clearly by traditional systematic approaches. Previous studies show that major differences in immunoglobulin gene structure and organization typify different phylogenetic lineages. To date, mammalian-, avian-, and elasmobranch-type gene organizations have been identified in representatives of these different phylads. A fourth form or organization is found in Latimeria, which possesses immunoglobutin heavy-chain variable region (V(H)) elements separated by almost-equal-to 190 nucleotides from diversity (D) elements. Adjacency of V(H) and D elements is characteristic of the elasmobranch ''clustered'' arrangement, although many other features of coelacanth V(H) gene organization and structure are more similar to those of bony fishes and tetrapods. These observations strongly support a phylogenetic hypothesis in which Latimeria occupies a sister-group relationship with teleosts and tetrapods. C1 UNIV S FLORIDA, ALL CHILDRENS HOSP, 801 6TH ST S, ST PETERSBURG, FL 33701 USA. LAWRENCE LIVERMORE NATL LAB, CTR HUMAN GENOME, LIVERMORE, CA 94550 USA. FU NIAID NIH HHS [AI-23338]; NIGMS NIH HHS [GM-38656] NR 41 TC 28 Z9 30 U1 0 U2 4 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD JUL 15 PY 1993 VL 90 IS 14 BP 6661 EP 6665 DI 10.1073/pnas.90.14.6661 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM681 UT WOS:A1993LM68100059 PM 8341683 ER PT J AU SETLOW, RB GRIST, E THOMPSON, K WOODHEAD, AD AF SETLOW, RB GRIST, E THOMPSON, K WOODHEAD, AD TI WAVELENGTHS EFFECTIVE IN INDUCTION OF MALIGNANT-MELANOMA SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE XIPHOPHORUS FISHES; ULTRAVIOLET RADIATION; VISIBLE LIGHT; SUPPRESSOR GENES; OZONE DEPLETION ID PYRIMIDINE DIMER FORMATION; SKIN IRRADIATED INSITU; ACTION SPECTRA; ULTRAVIOLET-LIGHT; CELLS; RADIATIONS; DEPENDENCE; ERYTHEMA; DNA AB It is generally agreed that sunlight exposure is one of the etiologic agents in malignant melanoma of fair-skinned individuals. However, the wavelengths responsible for tumorigenesis are not known, although DNA is assumed to be the target because individuals defective in the repair of UV damage to DNA are several thousandfold more prone to the disease than the average population. Heavily pigmented backcross hybrids of the genus Xiphophorus (platyfish and swordtails) are very sensitive to melanoma induction by single exposures to UV. We irradiated groups of five 6-day-old fish with narrow wavelength bands at 302, 313, 365, 405, and 436 nm and scored the irradiated animals for melanomas 4 months later. We used several exposures at each wavelength to obtain estimates of the sensitivity for melanoma induction as a function of exposure and wavelength. The action spectrum (sensitivity per incident photon as a function of wavelength) for melanoma induction shows appreciable sensitivity at 365, 405, and probably 436 nm, suggesting that wavelengths not absorbed directly in DNA are effective in induction. We interpret the results as indicating that light energy absorbed in melanin is effective in inducing melanomas in this animal model and that, in natural sunlight, 90-95% of melanoma induction may be attributed to wavelengths > 320 nm-the UV-A and visible spectral regions. RP SETLOW, RB (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. NR 25 TC 493 Z9 498 U1 3 U2 23 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD JUL 15 PY 1993 VL 90 IS 14 BP 6666 EP 6670 DI 10.1073/pnas.90.14.6666 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM681 UT WOS:A1993LM68100060 PM 8341684 ER PT J AU ABATE, C BAKER, SJ LEESMILLER, SP ANDERSON, CW MARSHAK, DR CURRAN, T AF ABATE, C BAKER, SJ LEESMILLER, SP ANDERSON, CW MARSHAK, DR CURRAN, T TI DIMERIZATION AND DNA-BINDING ALTER PHOSPHORYLATION OF FOS AND JUN SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE TRANSCRIPTION FACTORS; ONCOGENESIS; SIGNAL TRANSDUCTION; POSTTRANSLATIONAL MODIFICATION ID ACTIVATED PROTEIN-KINASE; LEUCINE ZIPPER; C-JUN; MOUSE FIBROBLASTS; INVITRO; EXPRESSION; DOMAINS; HETERODIMERS; TRANSITION; COMMON AB Fos and Jun form dimeric complexes that bind to activator protein 1 (AP-1) DNA sequences and regulate gene expression. The levels of expression and activities of these proteins are regulated by a variety of extracellular stimuli. They are thought to function in nuclear signal transduction processes in many different cell types. The role of Fos and Jun in gene transcription is complex and may be regulated in several ways including association with different dimerization partners, interactions with other transcription factors, effects on DNA topology, and reduction/oxidation of a conserved cysteine residue in the DNA-binding domain. In addition, phosphorylation has been suggested to control the activity of Fos and Jun. Here we show that phosphorylation of Fos and Jun by several protein kinases is affected by dimerization and binding to DNA. Jun homodimers are phosphorylated efficiently by casein kinase II, whereas Fos-Jun heterodimers are not. DNA binding also reduces phosphorylation of Jun by casein kinase II, p34cdc2 (cdc2) kinase, and protein kinase C. Phosphorylation of Fos by cAMP-dependent protein kinase and cdc2 is relatively insensitive to dimerization and DNA binding, whereas phosphorylation of Fos and Jun by DNA-dependent protein kinase is dramatically stimulated by binding to the AP-1 site. These results imply that different protein kinases can distinguish among Fos and Jun proteins in the form of monomers, homodimers, and heterodimers and between DNA-bound and non-DNA-bound proteins. Thus, potentially, these different states of Fos and Jun can be recognized and regulated independently by phosphorylation. C1 ROCHE INST MOLEC BIOL, ROCHE RES CTR, NUTLEY, NJ 07110 USA. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. COLD SPRING HARBOR LAB, COLD SPRING HARBOR, NY 11724 USA. RI Abate-Shen, Cory/O-2520-2014; Curran, Tom/C-1164-2008; Curran, Tom/D-7515-2011 OI Abate-Shen, Cory/0000-0002-5021-0570; Curran, Tom/0000-0003-1444-7551; FU NCI NIH HHS [CA13106]; NIA NIH HHS [AG14742] NR 44 TC 62 Z9 63 U1 0 U2 1 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD JUL 15 PY 1993 VL 90 IS 14 BP 6766 EP 6770 DI 10.1073/pnas.90.14.6766 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM681 UT WOS:A1993LM68100080 PM 8341696 ER PT J AU DEBROUCKERE, G FELLER, D KOOT, JJA AF DEBROUCKERE, G FELLER, D KOOT, JJA TI CONFIGURATION-INTERACTION CALCULATIONS ON THE X 1-SIGMA+ GROUND-STATE AND LOW-LYING A 1-PI AND 1-DELTA EXCITED-STATES OF THE PN MOLECULE .2. POTENTIAL-ENERGY CURVES OF THE A 1-PI AND 1-DELTA EXCITED-STATES OF PN AND SPECTROSCOPIC PROPERTIES SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID TRANSITION; SPECTRUM AB CI calculations have been performed on the A 1PI and 1DELTA states of PN in the vicinity of their respective equilibrium geometries, yielding spectroscopic constants (r(e), k(e), omega(e), omega(e)x(e), etc) in good agreement with the available experimental data. The 1DELTA state, which is unknown experimentally, is predicted to lie less than 500 cm-1 above the 1PI state and 40 345 cm-1 above the 1SIGMA+ ground state. Theoretical vibrational bands for the A 1PI --> X 1SIGMA+ transition were computed, along with the corresponding Franck-Condon factors. The calculated vibrational transitions agree quite well with the observed values while the Franck-Condon factors compare favourably with those calculated semiempirically from observed vibrational transition probabilities. The sequence of absolute radiative intensities for the rovibrational (j' = 4) bands \upsilon', upsilon'')], i.e. \(0,0)]\(1,0)]\(2,1)]\(3,2)]1\(4,3)], cannot be confirmed experimentally because of the perturbation of nearby states on low-lying 1PI vibrational states (upsilon' = 0-4). Spontaneous radiative and non-radiative lifetimes derived according to two decay mechanisms-a cascade (A 1PI state being 'isolated') mechanism and an electric dipolar transition mechanism-show that the latter mode of decay is several orders of magnitude larger. The single experimentally known lifetime value, i.e. for upsilon' = 0, issued from this decay mode agrees reasonably well with the calculated value. For the 1DELTA --> A 1PI transition, the electric dipolar decay is only slightly favoured with respect to the cascade mode. The lifetimes computed for both decay modes are found to be close to those in the valence isoelectronic CO molecule. Other miscellaneous observables, which to date have not been determined experimentally for these excited states, including pure rotational, pure vibrational and rovibrational transitions, selected one-electron properties and average values of the electric dipole moment over the first few vibrational levels (upsilon = 0-5) are likewise reported. C1 PACIFIC NW LAB, THEORY MODELING & SIMULAT MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. STICHTING ACAD REKENCTR, 1098 SJ AMSTERDAM, NETHERLANDS. RP DEBROUCKERE, G (reprint author), UNIV AMSTERDAM, DEPT PHYS & ASTRON, VALCKENIERST 65, 1018 XE AMSTERDAM, NETHERLANDS. NR 32 TC 13 Z9 13 U1 0 U2 7 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD JUL 14 PY 1993 VL 26 IS 13 BP 1915 EP 1934 PG 20 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LQ269 UT WOS:A1993LQ26900014 ER PT J AU DATTA, RP RAY, AK WIENKE, BR AF DATTA, RP RAY, AK WIENKE, BR TI A DISCRETE ORDINATES STUDY OF 2-DIMENSIONAL ELECTRON-TRANSPORT SO JOURNAL OF PHYSICS D-APPLIED PHYSICS LA English DT Article ID PLASMAS AB We have developed a numerical algorithm to study electron transport in two spatial dimensions using the method of discrete ordinates. A spatial differencing scheme based on the method of characteristics has been used, in contrast to traditional methods that use finite differencing. In our multigroup approach to energy dependence, the within-group cross sections are modelled using elastic electron nuclear scattering while the outside-group cross sections are treated in the continuous slowing down approximation. Two cross section formalisms have been used for the elastic scattering part. Results of a two-dimensional calculation using two quadrature sets of orders four and six, for the two scattering formalisms, are presented and compared with available results. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP DATTA, RP (reprint author), UNIV TEXAS,DEPT PHYS,ARLINGTON,TX 76019, USA. NR 49 TC 2 Z9 2 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0022-3727 J9 J PHYS D APPL PHYS JI J. Phys. D-Appl. Phys. PD JUL 14 PY 1993 VL 26 IS 7 BP 1077 EP 1083 DI 10.1088/0022-3727/26/7/011 PG 7 WC Physics, Applied SC Physics GA LN951 UT WOS:A1993LN95100011 ER PT J AU PICKERING, IJ SANSONE, M MARSCH, J GEORGE, GN AF PICKERING, IJ SANSONE, M MARSCH, J GEORGE, GN TI DIFFRACTION ANOMALOUS FINE-STRUCTURE - A NEW TECHNIQUE FOR PROBING LOCAL ATOMIC ENVIRONMENT SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID X-RAY-DIFFRACTION; TRANSITION-METAL COMPLEXES; SHAKE-DOWN PHENOMENA; POWDER DIFFRACTION; ABSORPTION-EDGE; K-EDGE; ELECTRONIC-STRUCTURE; SCATTERING; SPECTRA; XANES AB Diffraction anomalous fine structure (DAFS) is the fine structure in the intensity of an X-ray diffraction peak in the vicinity of an absorption edge. DAFS is measured by monitoring the intensity of a diffraction peak as a function of the incident X-ray energy as it is scanned through an absorption edge. It combines the short range structural sensitivity of X-ray absorption spectroscopy with the long range periodicity of X-ray diffraction and can provide structural information which is not available from these techniques alone or in combination. We demonstrate the technique for several different dilute, polycrystalline samples, and present an iterative data analysis method which allows the extraction of a specific X-ray absorbance spectrum from the DAFS spectrum. We demonstrate the ability of DAFS to distinguish between the local environments in each component of a physical mixture of two phases and to separate the contributions to the X-ray absorption spectrum of the tetrahedral and octahedral cobalt sites in the spinel Co3O4. Finally, we have used DAFS to study the polarized X-ray absorption spectra from polycrystalline K2Ni(CN)4. C1 EXXON RES & ENGN CO,ANNANDALE,NJ 08801. RP PICKERING, IJ (reprint author), STANFORD UNIV,SLAC,STANFORD SYNCHROTRON RADIAT LAB,POB 4349,BIN 69,STANFORD,CA 94309, USA. RI George, Graham/E-3290-2013; Pickering, Ingrid/A-4547-2013; OI Pickering, Ingrid/0000-0002-0936-2994 NR 50 TC 69 Z9 71 U1 1 U2 16 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUL 14 PY 1993 VL 115 IS 14 BP 6302 EP 6311 DI 10.1021/ja00067a052 PG 10 WC Chemistry, Multidisciplinary SC Chemistry GA LT173 UT WOS:A1993LT17300052 ER PT J AU DOORN, SK DYER, RB STOUTLAND, PO WOODRUFF, WH AF DOORN, SK DYER, RB STOUTLAND, PO WOODRUFF, WH TI ULTRAFAST ELECTRON-TRANSFER AND COUPLED VIBRATIONAL DYNAMICS IN CYANIDE BRIDGED MIXED-VALENCE TRANSITION-METAL DIMERS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID CHARGE-TRANSFER; RAMAN-SCATTERING; COMPLEXES; EXCITATION; RATES; STATE; SPECTROSCOPY; RELAXATION; KINETICS; CENTERS AB Picosecond infrared spectroscopy has been used to investigate electron transfer and vibrational excitation and relaxation in the mixed-valence transition-metal dimer [(NC)5MIICNMIII(NH3)5]- (M = Ru, Os). Optical excitation into the metal-to-metal charge transfer band results in formation of the excited state redox isomer [(NC)5MIIICNMII(NH3)5]-. Subsequent back electron transfer results in reformation of the ground state and occurs with tau < 0.5 ps. Upon return to the ground electronic state, large amounts of energy (up to 7 quanta, 14 000 cm-1) are placed into the terminal MC=N stretching mode. The rate of the subsequent energy relaxation was measured; decay times ranged from <0.5 to 6 ps for the ruthenium analog and from 1.8 to 18 ps for the osmium analog. Results are compared to recent theoretical models of Jortner and Bixon. C1 LOS ALAMOS NATL LAB, DIV CHEM & LASER SCI, MAIL STOP J-567, LOS ALAMOS, NM 87545 USA. LOS ALAMOS NATL LAB, DIV ISOTOPE & NUCL CHEM, LOS ALAMOS, NM 87545 USA. NR 48 TC 82 Z9 82 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUL 14 PY 1993 VL 115 IS 14 BP 6398 EP 6405 DI 10.1021/ja00067a065 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA LT173 UT WOS:A1993LT17300065 ER PT J AU CHUNG, HH BENSON, DR SCHULTZ, PG AF CHUNG, HH BENSON, DR SCHULTZ, PG TI PROBING THE ROLE OF LYSINE 16 IN RAS P(21) PROTEIN WITH UNNATURAL AMINO-ACIDS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID CRYSTALLINE ADENYLATE KINASE; GTP HYDROLYSIS; ESCHERICHIA-COLI; BINDING LOOP; P21; MECHANISM; MUTANTS; PRODUCT; GENE; SITE C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 34 TC 10 Z9 10 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUL 14 PY 1993 VL 115 IS 14 BP 6414 EP 6415 DI 10.1021/ja00067a068 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA LT173 UT WOS:A1993LT17300068 ER PT J AU BALOOCH, M HAMZA, AV AF BALOOCH, M HAMZA, AV TI OBSERVATION OF C-60 CAGE OPENING ON SI(111)-(7X7) SO APPLIED PHYSICS LETTERS LA English DT Article AB The ''opening'' of C60 on Si(111)-(7 X 7) has been directly observed by scanning tunneling microscopy and correlated with Auger electron spectroscopy (AES) and temperature-programmed desorption spectroscopy. Isolated C60 clusters are observed on Si(111)-(7 X 7) after annealing the surface to 620 K. Annealing the surface to 1020 K causes the C60 cages to open and thereby cover more of the surface. Also evident is that the opened clusters agglomerate on the surface. The opening of the C60 cage is correlated with an increase in the amount of silicon-carbon bonding and with the increase in the carbon-to-silicon AES peak height ratio with increasing annealing temperature. The ratio increases since the opened cages cover more of the substrate silicon atoms, reducing AES emission from the substrate. RP BALOOCH, M (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94551, USA. NR 10 TC 39 Z9 39 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 12 PY 1993 VL 63 IS 2 BP 150 EP 152 DI 10.1063/1.110382 PG 3 WC Physics, Applied SC Physics GA LL831 UT WOS:A1993LL83100010 ER PT J AU DEBOISSIEU, M BOUDARD, M BELLISSENT, R QUILICHINI, M HENNION, B CURRAT, R GOLDMAN, AI JANOT, C AF DEBOISSIEU, M BOUDARD, M BELLISSENT, R QUILICHINI, M HENNION, B CURRAT, R GOLDMAN, AI JANOT, C TI DYNAMICS OF THE ALPDMN ICOSAHEDRAL PHASE SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID INELASTIC-NEUTRON-SCATTERING; AL-LI-CU; QUASI-CRYSTAL; PD-MN; RENORMALIZATION-GROUP; SCHRODINGER-EQUATION; LATTICE-DYNAMICS; INCOMMENSURATE; QUASICRYSTALS; PHONONS AB A centimetre-sized single grain of th, perfect AlPdMn icosahedral phase was grown by slow cooling from the melt. It has been fully characterized to be of perfect icosahedral symmetry, i.e. without any frozen-in phason strain. The dynamical properties of this icosahedral phase have been studied by means of inelastic neutron scattering measurements on a triple-axis spectrometer. The response function S(Q, omega) was measured around several Bragg reflections and along the high-symmetry twofold, threefold and fivefold axes of the icosahedron. In the long-wavelength limit there are well defined phonons whose width is limited by the instrumental resolution. The isotropy of acoustic modes is verified and the corresponding sound velocities are in good agreement with ultrasonic measurements made on the same sample. At shorter wavelengths, gaps are expected. By analogy with 1D Models and electron density of states calculations, the positions in reciprocal space where the strongest gaps are expected may be estimated. This defines a set of three main pseudo-Brillouin zones which are quasiperiodically stacked around each strong Bragg reflection chosen as the zone centre. In the limit of the instrumental resolution no gap could be detected, even when two branches crossed. Longitudinal and transverse modes become dispersionless for an energy equal to about 3 THz. A 4 THz optic branch is associated with the longitudinal mode. The energy width of the phonons is resolution limited for excitations below 2 THz but increases rapidly to reach a maximum value equal to 1 THz. For transverse modes propagating along two-, three- and fivefold axes this abrupt broadening is found to be isotropic and occurs for q lying between 0.4 and 0.7 angstrom-1. This broadening is interpreted as being a consequence of a continuous distribution of dispersionless modes in the range 2-4.5 THz. Two main 'optic bands' centred on 3 and 4 THz may be defined in this region. C1 INST LAUE LANGEVIN,F-38042 GRENOBLE 9,FRANCE. CENS,LAB LEON BRILLOUIN,F-91191 GIF SUR YVETTE,FRANCE. US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. CNRS,CRISTALLOG LAB,F-38042 GRENOBLE,FRANCE. RP DEBOISSIEU, M (reprint author), ENSEEG,THERMODYNAM & PHYS CHIM METALLURG LAB,CNRS,UA 29,BP 75,F-38402 ST MARTIN DHERES,FRANCE. NR 53 TC 66 Z9 66 U1 0 U2 5 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD JUL 12 PY 1993 VL 5 IS 28 BP 4945 EP 4966 PG 22 WC Physics, Condensed Matter SC Physics GA LM776 UT WOS:A1993LM77600010 ER PT J AU MAHAUX, C SATCHLER, GR AF MAHAUX, C SATCHLER, GR TI TEMPORAL NONLOCALITY OF NUCLEAR AND ATOMIC MEAN FIELDS SO NUCLEAR PHYSICS A LA English DT Article ID HEAVY-ION SCATTERING; POLARIZATION POTENTIALS; ELECTRON-SCATTERING; DISPERSION-RELATION; COULOMB BARRIER; STATES; EQUATION AB Microscopic theories of the nuclear and atomic mean fields lead to a potential which is nonlocal in time as well as in space. Some properties of the temporal nonlocality are examined, including the consequences of requiring that causality be satisfied. One of these consequences is that the temporal nonlocality is fully determined by the energy dependence of the imaginary part of the field. It is shown that different temporal nonlocalities are associated with the two basic microscopic definitions of the mean field, namely Feshbach's potential and the self-energy. A physical interpretation of the temporal nonlocality is presented, in terms of a time delay induced by couplings to nonelastic channels. Models for the temporal nonlocality of the nucleon-nucleus mean field are analyzed. C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. RP MAHAUX, C (reprint author), UNIV LIEGE,INST PHYS B5,B-4000 LIEGE 1,BELGIUM. NR 42 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUL 12 PY 1993 VL 560 IS 1 BP 5 EP 22 DI 10.1016/0375-9474(93)90079-D PG 18 WC Physics, Nuclear SC Physics GA LU362 UT WOS:A1993LU36200002 ER PT J AU GUHR, T AF GUHR, T TI ON THE LEVEL DENSITY OF COUPLED GAUSSIAN UNITARY ENSEMBLES SO NUCLEAR PHYSICS A LA English DT Article ID SUPERSYMMETRY; INTEGRATION; SCATTERING AB Gaussian unitary ensembles are studied which are coupled in such a way that only next neighbors are connected. This so-called hopping structure appears in nuclear and solid-state physics and in general statistical mechanics. The one-point function and thus the level density for large level numbers is evaluated as a power series in the coupling parameter by a saddle-point approximation. Employing the recently developed graded Fourier-Bessel analysis, the one-point function is also calculated for finite level numbers up to first order in the coupling. In the course of these investigations, the real part of the one-point function of one single GUE is, for the first time, worked out inclosed form for finite level number. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP GUHR, T (reprint author), UNIV COPENHAGEN,NIELS BOHR INST,BLEGDAMSVEJ 17,DK-2100 COPENHAGEN,DENMARK. NR 18 TC 14 Z9 14 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUL 12 PY 1993 VL 560 IS 1 BP 223 EP 252 DI 10.1016/0375-9474(93)90094-E PG 30 WC Physics, Nuclear SC Physics GA LU362 UT WOS:A1993LU36200017 ER PT J AU GINOCCHIO, JN AF GINOCCHIO, JN TI DOUBLE-CHARGE-EXCHANGE AND GENERALIZED SENIORITY SO NUCLEAR PHYSICS A LA English DT Article ID NUCLEAR SHELL-MODEL AB The double charge exchange transition matrix elements from an even-even target to the double isobaric analog state and the ground state are derived in the generalized seniority model as a function of the number of valence nucleons. Crucial differences with the seniority model are found and their consequences are discussed. RP GINOCCHIO, JN (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 17 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUL 12 PY 1993 VL 560 IS 1 BP 321 EP 332 DI 10.1016/0375-9474(93)90099-J PG 12 WC Physics, Nuclear SC Physics GA LU362 UT WOS:A1993LU36200022 ER PT J AU LIPKIN, HJ AF LIPKIN, HJ TI MOSSBAUER-TYPE SUM-RULES FOR HEAVY-QUARK MESON DECAYS SO NUCLEAR PHYSICS A LA English DT Article AB We examine the possible use of sum rules derived for the Mossbauer effect for weak decay transitions from an initial state \i(b)] of a hadron containing one b quark and other light-quark degrees of freedom to a final state \f(c)] of a hadron containing one c quark and other light-quark degrees of freedom. The basic physics common to the two different processes is that a nucleus or heavy quark in a bound system emits a photon or a virtual W boson via a pointlike electroweak vertex, and that the photon or W leaves the scene immediately without further final-state interactions. The sudden boson emission changes the mass, momentum and spin of the heavy quark or nucleus that emitted the boson without changing the remaining degrees of freedom. C1 TEL AVIV UNIV,RAYMOND & BEVERLY SACKLER FAC EXACT SCI,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. RP LIPKIN, HJ (reprint author), WEIZMANN INST SCI,DEPT NUCL PHYS,IL-76100 REHOVOT,ISRAEL. NR 10 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUL 12 PY 1993 VL 560 IS 1 BP 548 EP 558 DI 10.1016/0375-9474(93)90114-D PG 11 WC Physics, Nuclear SC Physics GA LU362 UT WOS:A1993LU36200037 ER PT J AU DOVER, CB GAL, A AF DOVER, CB GAL, A TI A GENERALIZED BETHE-WEIZSACKER MASS FORMULA FOR STRANGE HADRONIC MATTER SO NUCLEAR PHYSICS A LA English DT Article ID EXCHANGE-POTENTIAL APPROACH; BARYON-BARYON SCATTERING; DOUBLE HYPERNUCLEUS; LAMBDA-HYPERNUCLEI; NUCLEON-SCATTERING; EQUATION; PARTICLE AB We extend the Bethe-Weizsacker nuclear mass formula to strange hadronic matter composed of nucleons, lambdas and cascade hyperons. The generalized formula contains several volume and symmetry terms constrained by phenomenologically determined LAMBDA-nuclear, XI-nuclear and LAMBDALAMBDA interaction parameters and by hyperon-hyperon (LAMBDALAMBDA, LAMBDAXI, XIXI) interaction parameters suggested by one-boson-exchange models. We confirm that multi-LAMBDA hypernuclei are generally unstable to LAMBDALAMBDA --> XIN conversion. For strange hadronic matter we determine, as function of the baryon number A, the line of strong-interaction stability, along which a large strangeness fraction absolute value of S/A approximately 0.5-1.1 and a low charge fraction q/A less than or similar to 0.2 hold, and no fission occurs. The binding energy per baryon increases monotonically to its bulk limit, B/A --> 38 MeV, absolute value of S/A --> 1.1 and q/A --> 0 for the parameters adopted here assuming that the hyperon species saturate at densities similar to those of protons and neutrons in nuclei. Even in the extreme limit of vanishingly small hyperon-hyperon interaction strengths, strange hadronic matter with B/A --> 15 MeV, absolute value of S/A --> 0.7 and q/A --> 0 in the bulk limit should exist and our mass formula reproduces semi-quantitatively recent mean-field calculations which implicitly assumed weak hyperon-hyperon interactions. C1 HEBREW UNIV JERUSALEM,IL-91904 JERUSALEM,ISRAEL. UNIV WASHINGTON,NATL INST NUCL THEORY,SEATTLE,WA 98195. RP DOVER, CB (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 26 TC 22 Z9 22 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUL 12 PY 1993 VL 560 IS 1 BP 559 EP 585 DI 10.1016/0375-9474(93)90115-E PG 27 WC Physics, Nuclear SC Physics GA LU362 UT WOS:A1993LU36200038 ER PT J AU BUSH, BW NIX, JR AF BUSH, BW NIX, JR TI CLASSICAL HADRODYNAMICS - APPLICATION TO SOFT NUCLEON-NUCLEON COLLISIONS SO NUCLEAR PHYSICS A LA English DT Article ID ELECTRODYNAMICS AB We present results for soft nucleon-nucleon collisions at p(lab) = 14.6, 30, 60, 100 and 200 GeV/c calculated on the basis of classical hadrodynamics for extended nucleons. This theory, which corresponds to nucleons of finite size interacting with massive neutral scalar and vector meson fields, is the classical analogue of the quantum hadrodynamics of Serot and Walecka but without the assumptions of the mean-field approximation and of point nucleons. The theory is manifestly Lorentz-covariant and automatically includes space-time nonlocality and retardation, nonequilibrium phenomena, interactions among all nucleons and particle production when used for applications such as relativistic heavy-ion collisions. We briefly review the history of classical meson-field theory and present our classical relativistic equations of motion, which are solved to yield such physically observable quantities as scattering angle, transverse momentum, radiated energy and rapidity. We find that the theory provides a physically reasonable description of gross features associated with the soft reactions that dominate nucleon-nucleon collisions. The equations of motion are practical to solve numerically for relativistic heavy-ion collisions. C1 LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. OI Bush, Brian/0000-0003-2864-7028 NR 49 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD JUL 12 PY 1993 VL 560 IS 1 BP 586 EP 602 DI 10.1016/0375-9474(93)90116-F PG 17 WC Physics, Nuclear SC Physics GA LU362 UT WOS:A1993LU36200039 ER PT J AU GROSS, DJ AF GROSS, DJ TI 2-DIMENSIONAL QCD AS A STRING THEORY SO NUCLEAR PHYSICS B LA English DT Article ID LATTICE GAUGE-THEORY; PHASE-TRANSITION; RANDOM SURFACES; YANG-MILLS AB I explore the possibility of finding an equivalent string representation of two-dimensional QCD. I develop the large N expansion of the QCD2 Partition function on an arbitrary two-dimensional euclidean manifold. If this is related to a two-dimensional string theory then many of the coefficients of the 1/N expansion must vanish. This is shown to be true to all orders, giving strong evidence for the existence of a string representation. RP GROSS, DJ (reprint author), LAWRENCE BERKELEY LAB,DEPT PHYS,THEORET PHYS GRP,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 25 TC 179 Z9 179 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL 12 PY 1993 VL 400 IS 1-3 BP 161 EP 180 DI 10.1016/0550-3213(93)90402-B PG 20 WC Physics, Particles & Fields SC Physics GA LM676 UT WOS:A1993LM67600008 ER PT J AU ESKOLA, KJ AF ESKOLA, KJ TI SCALE DEPENDENCE OF NUCLEAR GLUON STRUCTURE SO NUCLEAR PHYSICS B LA English DT Article ID INELASTIC MUON SCATTERING; CROSS-SECTIONS; ELECTRON-SCATTERING; QUARK DISTRIBUTIONS; A-DEPENDENCE; SMALL VALUES; SMALL X; COLLISIONS; DEUTERIUM; QCD AB QCD-evolution of the parton distributions in nuclei is studied by using distributions at an initial scale Q0 = 2 GeV which conserve baryon charge and momentum. Two different ansatze for shadowing of gluons are considered. The main conclusion in both cases is that shadowing of gluons vanishes much more rapidly with increasing scales Q than shadowing of quarks and antiquarks. We also find that antishadowing of gluons for x greater than or similar to 0.1 is likely to be limited to less than or similar to 20%. As an application, we compute the average inclusive one-jet cross sections in pA and AA collisions at square-root s = 200 and 6500 GeV for A = 196. RP LAWRENCE BERKELEY LAB, DIV NUCL SCI, MAILSTOP 70A-3307, BERKELEY, CA 94720 USA. NR 61 TC 79 Z9 79 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL 12 PY 1993 VL 400 IS 1-3 BP 240 EP 266 DI 10.1016/0550-3213(93)90406-F PG 27 WC Physics, Particles & Fields SC Physics GA LM676 UT WOS:A1993LM67600012 ER PT J AU DODELSON, S GRADWOHL, BA AF DODELSON, S GRADWOHL, BA TI HOW EFFECTIVE IS THE EFFECTIVE POTENTIAL SO NUCLEAR PHYSICS B LA English DT Article ID ELECTROWEAK PHASE-TRANSITION; BARYON ASYMMETRY; PERTURBATION-THEORY; FALSE VACUUM; FIELD-THEORY; UNIVERSE; BARYOGENESIS; EXPANSION; SYMMETRY; MODELS AB Motivated by bubble nucleation in first order phase transitions, we question the validity of the effective potential for inhomogeneous configurations. In an attempt to get some insight into the importance of derivative terms, we analyze a simple model, a kink in 1 + 1 dimensions and zero temperature. We evaluate the energy shift from the quantum fluctuations about the non-uniform background (i.e. the effective action) and compare it to the energy from the effective potential. Our results clearly show that for inhomogeneous configurations it may be inadequate to omit derivative terms and confine oneself to the effective potential. We then couple the kink field to an additional scalar field and perform the same comparison. The addition of the second field allows us to vary the mass of the fluctuations and their coupling to the underlying kink. If the mass of the second field is large, it does not feel the inhomogeneities in the kink field and consequently does not give rise to important derivative corrections in the effective action. In contrast, if the mass is small, derivative terms are significant and the effective potential fails. In the latter regime we can, however, rely on the Born approximation to calculate the effective action. C1 UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. RP DODELSON, S (reprint author), FERMILAB NATL ACCELERATOR LAB,NASA,CTR ASTROPHYS,POB 500,BATAVIA,IL 60510, USA. NR 52 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL 12 PY 1993 VL 400 IS 1-3 BP 435 EP 459 DI 10.1016/0550-3213(93)90412-I PG 25 WC Physics, Particles & Fields SC Physics GA LM676 UT WOS:A1993LM67600018 ER PT J AU COPELAND, EJ KOLB, EW LIDDLE, AR LIDSEY, JE AF COPELAND, EJ KOLB, EW LIDDLE, AR LIDSEY, JE TI OBSERVING THE INFLATION POTENTIAL SO PHYSICAL REVIEW LETTERS LA English DT Article ID UNIVERSE; PERTURBATIONS AB We show how observations of the density perturbation (scalar) spectrum and the gravitational wave (tensor) spectrum allow a reconstruction of the potential responsible for cosmological inflation. A complete functional reconstruction or a perturbative approximation about a single scale are possible; the suitability of each approach depends on the data available. Consistency equations between the scalar and tensor spectra are derived, which provide a powerful signal of inflation. C1 FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. UNIV SUSSEX,SCH MATH & PHYS SCI,CTR ASTRON,BRIGHTON BN1 9QH,E SUSSEX,ENGLAND. RP COPELAND, EJ (reprint author), UNIV SUSSEX,SCH MATH & PHYS SCI,BRIGHTON BN1 9QH,E SUSSEX,ENGLAND. NR 29 TC 75 Z9 75 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 12 PY 1993 VL 71 IS 2 BP 219 EP 222 DI 10.1103/PhysRevLett.71.219 PG 4 WC Physics, Multidisciplinary SC Physics GA LM033 UT WOS:A1993LM03300003 ER PT J AU CASTEN, RF ZAMFIR, NV BRENNER, DS AF CASTEN, RF ZAMFIR, NV BRENNER, DS TI UNIVERSAL ANHARMONIC VIBRATOR DESCRIPTION OF NUCLEI AND CRITICAL NUCLEAR-PHASE TRANSITIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID VARIABLE MOMENT AB A new analysis of yrast energies in collective medium and heavy even-even nuclei shows two startling results. First, although these nuclei exhibit widely varying structure [the ratio E(4(1)+)/E(2(1)+) ranges from approximately 2.0 to approximately 3.33], they show a universal behavior of an anharmonic vibrator with nearly constant anharmonicity in which the multiphonon interactions are independent of the internal structure of the vibration. Second, the transition from anharmonic vibrator to rotor can be described by critical phase transitional behavior. These results suggest a reexamination of very basic ideas of structural evolution in finite-body nuclear systems. C1 CLARK UNIV,WORCESTER,MA 01610. INST ATOM PHYS,BUCHAREST,ROMANIA. RP CASTEN, RF (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Zamfir, Nicolae Victor/F-2544-2011 NR 9 TC 105 Z9 105 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 JUL 12 PY 1993 VL 71 IS 2 BP 227 EP 230 DI 10.1103/PhysRevLett.71.227 PG 4 WC Physics, Multidisciplinary SC Physics GA LM033 UT WOS:A1993LM03300005 ER PT J AU HUGHES, IG BURGDORFER, J FOLKERTS, L HAVENER, CC OVERBURY, SH ROBINSON, MT ZEHNER, DM VANEMMICHOVEN, PAZ MEYER, FW AF HUGHES, IG BURGDORFER, J FOLKERTS, L HAVENER, CC OVERBURY, SH ROBINSON, MT ZEHNER, DM VANEMMICHOVEN, PAZ MEYER, FW TI SEPARATION OF KINETIC AND POTENTIAL ELECTRON-EMISSION ARISING FROM SLOW MULTICHARGED ION-SURFACE INTERACTIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGHLY CHARGED IONS; ABOVE-SURFACE; METAL-SURFACE; LIGHT-IONS; NEUTRALIZATION; COMPUTER AB Characteristic variations in the total electron yield gamma as a function of crystal azimuthal orientation are reported for slow N2+, N5+, and N6+ ions incident on a Au(011) single crystal. These variations allow the direct separation of kinetic and potential electron emission, and allow, for the first time, an analysis of the neutralization dynamics of multicharged ions interacting with a metal surface, above the kinetic emission threshold. Electron emission resulting from below-surface Auger transitions is shown to be the dominant potential emission mechanism. RP HUGHES, IG (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Overbury, Steven/C-5108-2016 OI Overbury, Steven/0000-0002-5137-3961 NR 16 TC 39 Z9 40 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 12 PY 1993 VL 71 IS 2 BP 291 EP 294 DI 10.1103/PhysRevLett.71.291 PG 4 WC Physics, Multidisciplinary SC Physics GA LM033 UT WOS:A1993LM03300021 ER PT J AU KADUWELA, AP VANHOVE, MA FADLEY, CS AF KADUWELA, AP VANHOVE, MA FADLEY, CS TI ADSORBATE STRUCTURES FROM PHOTOELECTRON DIFFRACTION - HOLOGRAPHIC RECONSTRUCTION OR REAL-SPACE TRIANGULATION - COMMENT SO PHYSICAL REVIEW LETTERS LA English DT Letter 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 3 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 12 PY 1993 VL 71 IS 2 BP 299 EP 299 DI 10.1103/PhysRevLett.71.299 PG 1 WC Physics, Multidisciplinary SC Physics GA LM033 UT WOS:A1993LM03300023 ER PT J AU HAO, ZD CLEM, JR AF HAO, ZD CLEM, JR TI FROM ISOTROPIC TO ANISOTROPIC SUPERCONDUCTORS - A SCALING APPROACH - COMMENT SO PHYSICAL REVIEW LETTERS LA English DT Letter ID II SUPERCONDUCTOR; CRITICAL-FIELD C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP HAO, ZD (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 7 TC 10 Z9 10 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 12 PY 1993 VL 71 IS 2 BP 301 EP 301 DI 10.1103/PhysRevLett.71.301 PG 1 WC Physics, Multidisciplinary SC Physics GA LM033 UT WOS:A1993LM03300025 ER PT J AU SILK, J STEBBINS, A AF SILK, J STEBBINS, A TI CLUMPY COLD DARK-MATTER SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC STRINGS; COSMOLOGY, THEORY; DARK MATTER; LARGE-SCALE STRUCTURE OF UNIVERSE ID GLOBAL TEXTURE; GALAXIES; UNIVERSE; PROBE AB Clumpiness is likely to be generic to cold dark matter cosmologies. We consider cold dark matter models with cosmic strings and textures appropriate for galaxy formation. CDM clumps with a density of approximately 10(7) M. pc-3 are generated at redshift approximately z(eq) and a sizable fraction of them may survive to today. The most numerous clumps should have dense cores of mass approximately 10(-2) (1 GeV/M(x))3/2 M., where M(x) is the mass of the dark matter particle and might contain up to 10(-3) of the CDM mass. Even in canonical, unseeded cold dark matter models, there is also likely to be clumpiness, developing when the first rare fluctuations go non-linear, and surviving on scales of up to 10(8) M. in galaxy halos. Observable implications include possible dark matter cores in globular clusters, and in galactic nuclei. The enhanced annihilation rate in clumps can lead to a significant contribution to the diffuse gamma-ray background, as well as emission from the Galactic center. Results from terrestrial dark matter detection experiments might be significantly affected by clumpiness in the Galactic halo. C1 UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP SILK, J (reprint author), UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720, USA. OI silk, joe/0000-0002-1566-8148 NR 25 TC 87 Z9 87 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 JUL 10 PY 1993 VL 411 IS 2 BP 439 EP 449 DI 10.1086/172846 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LJ884 UT WOS:A1993LJ88400001 ER PT J AU AUFDERHEIDE, MB AF AUFDERHEIDE, MB TI CONVECTION AND NEUTRINO EMISSION IN THE LATE STAGES OF MASSIVE STAR EVOLUTION SO ASTROPHYSICAL JOURNAL LA English DT Article DE CONVECTION; ELEMENTARY PARTICLES; STARS, EVOLUTION; STARS, INTERIOR; SUPERNOVAE, GENERAL ID THERMONUCLEAR REACTION-RATES; WEAK-INTERACTION RATES; HYDROSTATIC NUCLEOSYNTHESIS; CAPTURE RATES; CARBON; NUCLEI; HELIUM; DIFFUSION; PLASMA; PAIR AB It is argued that the treatment of convection, particularly the choice of mixing length, is a large source of uncertainty in the last stages of nuclear burning and thus in the development of iron cores for Type II supernovae. This sensitivity is the result of the delicate competition between convective energy transport and neutrino emission processes which become large during and after core carbon burning in stars with mass larger than approximately 10 M.. The role of the mixing length in standard treatments of convection is discussed, followed by demonstrations of how convection and neutrino emission affect the size of convective regions. The evidence for these effects can be seen in calculations of the core carbon burning phase by several groups. C1 SUNY,STONY BROOK,NY 11794. LAWRENCE LIVERMORE NATL LAB,IGPP,LIVERMORE,CA 94551. RP AUFDERHEIDE, MB (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV E,POB 808,LIVERMORE,CA 94551, USA. NR 54 TC 4 Z9 4 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUL 10 PY 1993 VL 411 IS 2 BP 813 EP 822 DI 10.1086/172885 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LJ884 UT WOS:A1993LJ88400040 ER PT J AU WOOSLEY, SE LANGER, N WEAVER, TA AF WOOSLEY, SE LANGER, N WEAVER, TA TI THE EVOLUTION OF MASSIVE STARS INCLUDING MASS-LOSS - PRESUPERNOVA MODELS AND EXPLOSION SO ASTROPHYSICAL JOURNAL LA English DT Review DE STARS, EVOLUTION; STARS, INTERIORS; STARS, MASS LOSS; STARS, WOLF-RAYET; SUPERNOVAE, GENERAL ID WOLF-RAYET STARS; WEAK-INTERACTION RATES; LARGE MAGELLANIC CLOUD; SHAPLEY-AMES GALAXIES; II SUPER-NOVAE; LIGHT CURVES; IB SUPERNOVAE; LUMINOUS STARS; CORE COLLAPSE; HELIUM STAR AB The evolution of massive stars of 35, 40, 60, and 85 M., is followed through all stages of nuclear burning to the point of iron core collapse. Critical nuclear reaction and mass-loss rates are varied. Efficient mass loss during the Wolf-Rayet stage is likely to lead to final masses as small as 4 M.. Indeed for a reasonable parameterization of the mass loss, there may be convergence of all Wolf-Rayet stars, both single and in binaries, to a narrow band of small final masses. Our representative model, a 4.25 M., Wolf-Rayet presupernova derived from a 60 M. star, is followed through a simulated explosion and its explosive nucleosynthesis and light curve determined. Its properties are similar to those observed in Type Ib supernovae. The effects of the initial mass and mass loss on the presupernova structure of small mass Wolf-Rayet models is also explored. We find that important properties of the presupernova star and its explosion can only be obtained by following the complete evolution starting on the main sequence. For example, the model examined differs substantially from a 4.25 M. helium core evolved at constant mass using the same physics. C1 LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,GEN STUDIES GRP,LIVERMORE,CA 94550. UNIV GOTTINGEN,STERNWARTE,W-3400 GOTTINGEN,GERMANY. RP WOOSLEY, SE (reprint author), UNIV CALIF SANTA CRUZ,LICK OBSERV,UCO,BOARD STUDIES ASTON & ASTROPHYS,SANTA CRUZ,CA 95064, USA. NR 101 TC 225 Z9 225 U1 0 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 JUL 10 PY 1993 VL 411 IS 2 BP 823 EP 839 DI 10.1086/172886 PN 1 PG 17 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LJ884 UT WOS:A1993LJ88400041 ER PT J AU CHEN, KY LEONARD, PJT AF CHEN, KY LEONARD, PJT TI DOES THE COALESCENCE OF WHITE-DWARFS PRODUCE MILLISECOND PULSARS IN GLOBULAR-CLUSTERS SO ASTROPHYSICAL JOURNAL LA English DT Article DE GLOBULAR CLUSTERS, GENERAL; STARS, NEUTRON; SUPERNOVAE, GENERAL; WHITE DWARFS ID 3-DIMENSIONAL HYDRODYNAMICAL SIMULATIONS; CRUSTAL PLATE-TECTONICS; RADIO PULSARS; STELLAR COLLISIONS; MAGNETIC-FIELDS; EVOLUTION; BINARY; STARS; DISCOVERY; ORIGIN AB Isolated main-sequence stars with initial masses in the range from congruent-to 1 to 8 or 9 M. will evolve into C + 0 white dwarfs with masses up to congruent-to 1.1 M., and those main-sequence stars with initial masses in the range from congruent-to 8 or 9 to 10 or 11 M. may produce 0 + Ne(+ Mg) white dwarfs with masses up to less than or similar 1.4 M.. Many such white dwarfs should exist in globular clusters, and pairs of them should coalesce frequently via collisional processes, especially if primordial binaries are present. It is quite possible that most of the short-period millisecond pulsars in the pre-core-collapse globular clusters have been produced via mergers of white dwarf pairs with total masses exceeding the Chandrasekhar limit. RP CHEN, KY (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,T-6,MS B288,LOS ALAMOS,NM 87545, USA. NR 39 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 JUL 10 PY 1993 VL 411 IS 2 BP L75 EP L78 DI 10.1086/186916 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LJ885 UT WOS:A1993LJ88500006 ER PT J AU URPIN, VA VANRIPER, KA AF URPIN, VA VANRIPER, KA TI CRUSTAL MAGNETIC-FIELD DECAY IN NEUTRON-STARS AND THE NATURE OF SUPERDENSE MATTER SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, MAGNETIC FIELDS; STARS, NEUTRON ID OHMIC DECAY; PULSARS; EVOLUTION AB The decay of a magnetic field anchored in the crust of a neutron star strongly depends on the state of the core matter in which the density exceeds that of nuclei. This dependence is a consequence of the temperature dependence of the electrical conductivity and hence the thermal history of the neutron star. The thermal evolution is determined by the properties of high-density core matter. Information about the state of this matter can be obtained from analysis of field decay even when the magnetic field is confined to the surface layers. We compare the field decay for two neutron star cooling models. One model includes only ''standard'' neutrino emissivities; the other presents an example of accelerated cooling by enhanced neutrino emission from the core. Our simulations show a large qualitative difference in evolution of the crustal field for these models, with much less field decay in the case of rapid cooling. C1 MAX PLANCK INST ASTROPHYS,GARCHING,GERMANY. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP URPIN, VA (reprint author), AF IOFFE PHYS TECH INST,ST PETERSBURG 194021,RUSSIA. NR 25 TC 25 Z9 26 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 JUL 10 PY 1993 VL 411 IS 2 BP L87 EP L90 DI 10.1086/186919 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LJ885 UT WOS:A1993LJ88500009 ER PT J AU SHERMAN, DM AF SHERMAN, DM TI EQUATION OF STATE AND HIGH-PRESSURE PHASE-TRANSITIONS OF STISHOVITE (SIO2) - AB-INITIO (PERIODIC HARTREE-FOCK) RESULTS SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID MOLECULAR-ORBITAL METHODS; VALENCE BASIS-SETS; LIQUID-IRON; ELASTICITY; STABILITY; SILICATES; ELEMENTS; MANTLE AB The possibility that free SiO2 may exist at the core mantle boundary motivates a first-principles investigation of the equation of state and possible phase transitions of stishovite using periodic Hartree-Fock theory. Using a moderately extended basis set, the calculated equation of state is shown to be in close agreement with experimental results taken under hydrostatic conditions. When fit to a third-order Birch-Murnaghan equation, the Hartree-Fock total energies give V0 = 46.1 A3, K0 = 328 GPa, and K' = 4.0. Moreover, the calculated equation of state is very close to that recently obtained using the linearized augmented plane wave method. The bonding in stishovite is unchanged by compression to 80% of its zero-pressure volume (corresponding to a pressure near 110 GPa). The possibility that stishovite might transform to a denser phase at high pressure is investigated by calculating the free energy of SiO2 in the modified-fluorite and alpha-PbO2 structures. The enthalpy of SiO2 with the fluorite and modified-fluorite structure is too high to allow those structures to be adopted. The 0 K enthalpy of silica in the alpha-PbO2 structure is within 10 kJ/mol of that of stishovite, and a transition to such a structure cannot be ruled out in the temperature regime of the lower mantle. However, the density of alpha-PbO2 structure SiO2 is only 2% greater than that of stishovite. RP SHERMAN, DM (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, POB 999, RICHLAND, WA 99352 USA. RI Sherman, David/A-7538-2008 OI Sherman, David/0000-0003-1835-6470 NR 41 TC 23 Z9 23 U1 0 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD JUL 10 PY 1993 VL 98 IS B7 BP 11865 EP 11873 DI 10.1029/93JB00783 PG 9 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA LM631 UT WOS:A1993LM63100010 ER PT J AU DUBA, A CONSTABLE, S AF DUBA, A CONSTABLE, S TI THE ELECTRICAL-CONDUCTIVITY OF LHERZOLITE SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID POLYCRYSTALLINE OLIVINE COMPACTS; MANTLE; PYROXENE; PRESSURE; ROCKS AB Electrical conductivity as a function of oxygen fugacity (f(O2)) between 10(-5) Pa and 1 Pa, temperature between 700-degrees-C and 1200-degrees-C, and time over a period of 1700 hours are reported for a lherzolite nodule from Mount Porndon, Australia. Analysis of complex impedance collected at 100 Hz, 1 kHz, and 10 kHz indicates that there is significant frequency dispersion in this rock at temperatures below 900-degrees-C - 1000-degrees-C. By choosing the resistance of an equivalent parallel RC network at the frequency having minimum phase, the effect of dispersion is largely avoided. Conductivity as a function of time, collected following changes in f(O2) at 1010 and 1200-degrees-C, has been analyzed to determine the diffusivity of defects relating f(O2) to the electrical conduction mechanism in olivine. The diffusivities so obtained are in remarkably good agreement with those determined from strain measurements during creep tests, which implies that magnesium vacancies are the rate-limiting step for conductivity reequilibration after f(O2) changes. A longer-term process is observed in this rock in which the conductivity drifts upward or downward with a time constant of hundreds of hours after initial reequilibration to gas mix (f(O2)) changes. We speculate that this long-term drift could be related to equilibration of the iron distribution between coexisting olivine and pyroxene as a function of f(O2). The sense is an increase in conductivity (olivine gains iron) at low f(O2) and vice versa. The lherzolite conductivity data are not significantly different from measurements made on olivine single crystals and polycrystals, even though the rock contains about 34 modal % pyroxene. This consistency of laboratory measurements of electrical conductivity of olivines from many localities and geological settings supports the use of recent models relating mantle temperature with electrical conductivity in the interpretation of mantle geo/electromagnetic soundings. C1 UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,LA JOLLA,CA 92093. RP DUBA, A (reprint author), LAWRENCE LIVERMORE NATL LAB,L201,LIVERMORE,CA 94550, USA. RI Constable, Steven/B-8959-2008 NR 33 TC 47 Z9 53 U1 0 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD JUL 10 PY 1993 VL 98 IS B7 BP 11885 EP 11899 DI 10.1029/93JB00995 PG 15 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA LM631 UT WOS:A1993LM63100012 ER PT J AU PAN, JM MASCHHOFF, BL DIEBOLD, U MADEY, TE AF PAN, JM MASCHHOFF, BL DIEBOLD, U MADEY, TE TI STRUCTURAL STUDY OF ULTRATHIN METAL-FILMS ON TIO2 USING LEED, ARXPS AND MEED SO SURFACE SCIENCE LA English DT Article ID BACKSCATTERED ELECTRON-DIFFRACTION; X-RAY PHOTOELECTRON; AUGER-ELECTRON; SCATTERING; TIO2(110); SURFACES; BANDS; CU AB A structural study of ultrathin Cr, Fe and Cu metal films on stoichiometric and Ar+ sputtered TiO2(110) surfaces has been carried out using low energy electron diffraction (LEED), angle-resolved XPS (ARXPS) and two-dimensional medium energy backscattered electron diffraction (MEED). Although LEED results indicate only weak long range order for all three metal films (Cr, Fe and Cu) on TiO2(110), clear evidence for a locally ordered structure can be observed using ARXPS and MEED. Both Cr and Fe films grow with bcc(100) structures on stoichiometric TiO2(110) yielding pronounced forward scattering features in ARXPS and MEED data. Cu overlayers grow with fcc(111) structures exhibiting two equivalent domain orientations on TiO2(110) that yield less pronounced features in ARXPS. However, MEED measurements of Cu films with different electron surface incidence angles show clear fcc(111) patterns for different domains. Both bcc(100) and fcc(111) MEED patterns are simulated by single scattering cluster (SSC) calculations, and the results are qualitatively consistent with experimental data. A bcc(100) short range ordering is also observed for ultrathin Cr and Fe films on long range disordered Ar+ sputtered TiO2(110) surfaces. C1 RUTGERS UNIV, DEPT PHYS & ASTRON, SURFACE MODIFICAT LAB, PISCATAWAY, NJ 08855 USA. PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RI Diebold, Ulrike/A-3681-2010 OI Diebold, Ulrike/0000-0003-0319-5256 NR 23 TC 84 Z9 86 U1 1 U2 19 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUL 10 PY 1993 VL 291 IS 3 BP 381 EP 394 DI 10.1016/0039-6028(93)90455-S PG 14 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LM166 UT WOS:A1993LM16600012 ER PT J AU BELYAEV, AK COLBERT, DT GROENENBOOM, GC MILLER, WH AF BELYAEV, AK COLBERT, DT GROENENBOOM, GC MILLER, WH TI STATE-TO-STATE REACTION PROBABILITIES FOR H-+H-2 D2 COLLISIONS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID QUANTUM SCATTERING; CROSS-SECTIONS; ION; H-2; STABILITY; CLUSTERS; ABINITIO AB The potential energy surfaces for the ground and low-lying excited states of the H-3- system are calculated by means of the diatomics-in-molecule (DIM) method. State-to-state reaction probabilities for rearrangement in H- + H-2, D2 collisions are calculated by the S matrix Kohn variational method in the discrete variable representation for the collinear configuration, and the results for H- + D2 collisions compared with recent experimental data. C1 UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204. CATHOLIC UNIV NIJMEGEN,DEPT THEORET CHEM,6525 ED NIJMEGEN,NETHERLANDS. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94702. LAWRENCE BERKELEY LAB,BERKELEY,CA 94702. RP BELYAEV, AK (reprint author), RUSSIAN PEDAG UNIV,DEPT THEORET PHYS & ASTRON,ST PETERSBURG,RUSSIA. RI Belyaev, Andrey/B-6051-2011; Groenenboom, Gerrit/F-9692-2015; OI Belyaev, Andrey/0000-0001-8834-1456; Groenenboom, Gerrit/0000-0002-0920-3707 NR 43 TC 38 Z9 38 U1 0 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD JUL 9 PY 1993 VL 209 IS 4 BP 309 EP 314 DI 10.1016/0009-2614(93)80023-I PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LL255 UT WOS:A1993LL25500002 ER PT J AU PEARSON, JE AF PEARSON, JE TI COMPLEX PATTERNS IN A SIMPLE SYSTEM SO SCIENCE LA English DT Article ID EQUAL DIFFUSION-COEFFICIENTS; STIRRED TANK REACTOR; AUTOCATALYTIC REACTIONS; INSTABILITIES; OSCILLATIONS AB Numerical simulations of a simple reaction-diffusion model reveal a surprising variety of irregular spatiotemporal patterns. These patterns arise in response to finite-amplitude perturbations. Some of them resemble the steady irregular patterns recently observed in thin gel reactor experiments. Others consist of spots that grow until they reach a critical size, at which time they divide in two. If in some region the spots become overcrowded, all of the spots in that region decay into the uniform background. RP PEARSON, JE (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. NR 20 TC 473 Z9 478 U1 5 U2 38 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUL 9 PY 1993 VL 261 IS 5118 BP 189 EP 192 DI 10.1126/science.261.5118.189 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LL596 UT WOS:A1993LL59600033 PM 17829274 ER PT J AU FONDA, HN GILBERT, JV CORMIER, RA SPRAGUE, JR KAMIOKA, K CONNOLLY, JS AF FONDA, HN GILBERT, JV CORMIER, RA SPRAGUE, JR KAMIOKA, K CONNOLLY, JS TI SPECTROSCOPIC, PHOTOPHYSICAL, AND REDOX PROPERTIES OF SOME MESOSUBSTITUTED FREE-BASE PORPHYRINS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID PHOTOINDUCED ELECTRON-TRANSFER; RESONANCE RAMAN-SPECTRA; QUANTUM YIELD; TETRAPHENYLPORPHYRINS; SOLVENT; TETRAPYRROLES; LUMINESCENCE; DERIVATIVES; DEPENDENCE; MOLECULES AB Spectroscopic and photophysical properties of unsubstituted free-base porphine and several symmetric meso-tetraalkyl- and meso-tetraarylporphyrins have been studied. Detailed analyses of absorption and fluorescence spectra, fluorescence lifetimes and quantum yields, and H-1 NMR spectra, as well as molar extinction coefficients and redox potentials, are reported. The experimental data are correlated with trends in the structural features of these molecules predicted by molecular mechanics calculations, including planarity of the macrocycles and the dihedral angles about the meso C-C bond. Conclusions concerning the role of excited-state lifetimes of some of the aryl-substituted porphyrins are presented. The significance of these results is discussed in terms of light-induced electron transfer in covalently linked porphyrin-containing assemblies. C1 NATL RENEWABLE ENERGY LAB, DIV BASIC SCI, PHOTOCONVERS BRANCH, GOLDEN, CO 80401 USA. NR 52 TC 94 Z9 95 U1 1 U2 15 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUL 8 PY 1993 VL 97 IS 27 BP 7024 EP 7033 DI 10.1021/j100129a017 PG 10 WC Chemistry, Physical SC Chemistry GA LV578 UT WOS:A1993LV57800017 ER PT J AU GESELBRACHT, MJ STACY, AM GARCIA, AR SILBERNAGEL, BG KWEI, GH AF GESELBRACHT, MJ STACY, AM GARCIA, AR SILBERNAGEL, BG KWEI, GH TI LOCAL ENVIRONMENT AND LITHIUM ION MOBILITY IN LINBO2 - INFERENCES FROM STRUCTURE, PHYSICAL-PROPERTIES, AND NMR SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID LIXNBO2; NIOBATE AB The structure and properties of LiNbO2, including the mobility of lithium ions, have been determined by Rietveld refinement of the structural model from powder neutron diffraction data and by analysis of Nb-93 and Li-7 NMR spectra, magnetic susceptibility data, and the optical spectrum. The material prepared for this study was found to be slightly deficient in lithium (relative to niobium), Li0.96NbO2 from chemical analysis and Li0.98NbO2 from the analysis of neutron diffraction data, but fully stoichiometric in oxygen. Close agreement between the lithium content and the lithium site occupancy suggests that there are few antisite defects, if any. The structural model for LiNbO2 first proposed by Meyer and Hoppe was confirmed by the refinement of the structural model from the powder neutron diffraction data; the static quadrupolar and dipolar interactions obtained from the NMR spectra are also consistent with this model, While impure samples are paramagnetic and exhibit field-dependent magnetic behavior, the purest samples are diamagnetic, and there is no field dependence. An absorption onset at approximately 2 eV was observed, providing further evidence that LiNbO2 is indeed a diamagnetic semiconductor, as predicted by the band structure calculation of Burdett and Hughbanks. Finally, variable temperature and frequency Li-7 NMR studies indicate two different types of lithium motion in the system, occurring at significantly different rates: a relatively high-frequency rattling process of the Li ion within a given octahedral site, accompanied by occasional hops to adjacent octahedral sites. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. EXXON RES & ENGN CO,CORP RES,ANNANDALE,NJ 08801. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 24 TC 21 Z9 21 U1 2 U2 20 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUL 8 PY 1993 VL 97 IS 27 BP 7102 EP 7107 DI 10.1021/j100129a030 PG 6 WC Chemistry, Physical SC Chemistry GA LV578 UT WOS:A1993LV57800030 ER PT J AU CHRISTEN, DK THOMPSON, JR AF CHRISTEN, DK THOMPSON, JR TI SUPERCONDUCTIVITY - CURRENT PROBLEMS AT HIGH T(C) SO NATURE LA English DT Editorial Material C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. RP CHRISTEN, DK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 8 TC 26 Z9 26 U1 0 U2 2 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD JUL 8 PY 1993 VL 364 IS 6433 BP 98 EP 99 DI 10.1038/364098a0 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LL367 UT WOS:A1993LL36700020 ER PT J AU SAGAWA, H BROWN, BA ESBENSEN, H AF SAGAWA, H BROWN, BA ESBENSEN, H TI PARITY INVERSION IN THE N=7 ISOTONES AND THE PAIRING BLOCKING EFFECT SO PHYSICS LETTERS B LA English DT Article ID SHELL-MODEL TREATMENT; A=4-16 NUCLEI; STATES; BE-11 AB The parity inversion anomaly in the spectra of N=7 isotones is discussed based on contemporary shell-model wave functions. It is shown that the proton-neutron monopole interaction in the mean field has a large effect on the energy gap between the 1/2- and 1/2+ states in Be-11, but not enough to explain the inverted spectrum. We point out that the effects of quadrupole core excitation and pairing blocking are equally important to make the parity inversion in Be-11. It is predicted that He-9 has also a parity inversion in the ground state due to the pairing blocking. C1 UNIV TOKYO,FAC SCI,DEPT PHYS,BUNKYO KU,TOKYO 113,JAPAN. MSU,DEPT PHYS & ASTRON,E LANSING,MI 48824. MSU,CYCLOTRON LAB,E LANSING,MI 48824. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. NR 21 TC 87 Z9 87 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 JUL 8 PY 1993 VL 309 IS 1-2 BP 1 EP 4 DI 10.1016/0370-2693(93)91493-7 PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LL474 UT WOS:A1993LL47400001 ER PT J AU LIDSEY, JE TAVAKOL, RK AF LIDSEY, JE TAVAKOL, RK TI ON THE CORRESPONDENCE BETWEEN THEORY AND OBSERVATIONS IN INFLATIONARY COSMOLOGY SO PHYSICS LETTERS B LA English DT Article ID FLUCTUATION SPECTRA; UNIVERSE AB We study the dynamical correspondence between the scalar fluctuation spectrum and the inflationary potential V(phi) and consider a power law spectrum with index beta as an example. We show that for the range of beta relevant to the interpretation of COBE observations, this correspondence is fragile, in the sense that small changes in beta could produce dramatic changes in the corresponding V(phi). This is of potential significance for the reconstruction of V(phi) from such observations and also in the wider context of inflationary models in which V(phi) is specially chosen to produce a desired spectrum and dynamics. C1 QUEEN MARY & WESTFIELD COLL,ASTRON UNIT,LONDON E1 4NS,ENGLAND. RP LIDSEY, JE (reprint author), FERMILAB NATL ACCELERATOR LAB,NASA FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510, USA. NR 24 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUL 8 PY 1993 VL 309 IS 1-2 BP 23 EP 27 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LL474 UT WOS:A1993LL47400005 ER PT J AU KENNEDY, DC AF KENNEDY, DC TI SEESAW NEUTRINO MASS RATIOS WITH RADIATIVE-CORRECTIONS SO PHYSICS LETTERS B LA English DT Article ID GRAND UNIFICATION AB Unlike neutrino masses, the ratios of neutrino masses can be predicted by up-quark seesaw models using the known quark masses and including radiative corrections, with some restrictive assumptions. The uncertainties in these ratios can be reduced to three: the type of seesaw (quadratic, linear, etc.), the top quark mass, and the Landau-triviality value of the top quark mass. RP KENNEDY, DC (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 17 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUL 8 PY 1993 VL 309 IS 1-2 BP 91 EP 94 DI 10.1016/0370-2693(93)91509-L PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LL474 UT WOS:A1993LL47400017 ER PT J AU GOTSMAN, E LEVIN, EM MAOR, U AF GOTSMAN, E LEVIN, EM MAOR, U TI LARGE RAPIDITY GAPS IN PP COLLISIONS SO PHYSICS LETTERS B LA English DT Article ID ELASTIC-SCATTERING; ENERGY AB The survival probability of large rapidity gaps in pp collisions is calculated for several different eikonal models of the Gaussian form. Results obtained for models based on partonic interactions are quite similar. The Regge-pole model predicts a higher value of [Absolute value of S 2]. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP GOTSMAN, E (reprint author), TEL AVIV UNIV,RAYMOND & BEVERLY SACKLER FAC EXACT SCI,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. NR 19 TC 82 Z9 82 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUL 8 PY 1993 VL 309 IS 1-2 BP 199 EP 204 DI 10.1016/0370-2693(93)91527-T PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LL474 UT WOS:A1993LL47400035 ER PT J AU GIELE, WT GLOVER, EWN KOSOWER, DA AF GIELE, WT GLOVER, EWN KOSOWER, DA TI SINGLE LEPTON PRODUCTION AT LARGE TRANSVERSE-MOMENTUM SO PHYSICS LETTERS B LA English DT Article AB We study the production of single isolated leptons at large transverse momentum, p(T)l > 1/2 M(W). The dominant source of such leptons is production of an on-shell W boson recoiling against a hard jet. Vetoing this jet forces the W boson to be produced off resonance and significantly reduces the standard model cross section, thereby enhancing the discovery prospects for non standard model physics. A significant number of events have the topologically interesting signature of a large p(T) lepton balancing a jet with little measured missing transverse energy. C1 UNIV DURHAM,DEPT PHYS,DURHAM DH1 3LE,ENGLAND. CERN,DIV THEORY,CH-1211 GENEVA 23,SWITZERLAND. RP GIELE, WT (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. RI Glover, Edward/A-4597-2012 OI Glover, Edward/0000-0002-0173-4175 NR 6 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JUL 8 PY 1993 VL 309 IS 1-2 BP 205 EP 209 DI 10.1016/0370-2693(93)91528-U PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LL474 UT WOS:A1993LL47400036 ER PT J AU VANHOVE, MA AF VANHOVE, MA TI SURFACE CRYSTALLOGRAPHY WITH LOW-ENERGY-ELECTRON DIFFRACTION SO PROCEEDINGS OF THE ROYAL SOCIETY-MATHEMATICAL AND PHYSICAL SCIENCES LA English DT Article ID CRITICAL COMPILATION; STRUCTURAL-ANALYSIS; DIFFUSE LEED; TENSOR LEED; RECONSTRUCTION; INTENSITIES; BENZENE; RH(111); PT(111) AB Bragg's 1913 publication of the principles of X-ray crystallography came only a year after von Laue's discovery of X-ray diffraction from crystals. Structure determination (of small molecules) with high-energy electron diffraction followed by just three years the 1927 discovery of electron diffraction by Davisson and Germer. By contrast, low-energy electron diffraction (LEED) would require four more decades before yielding its first structure determinations (of surfaces) around 1970. The delay was primarily due to the need for ultra-high vacuum and to a lesser extent to the need for a suitable theory to model multiple scattering. This review will sketch the development of surface crystallography by LEED and describe its principles and present capabilities. RP VANHOVE, MA (reprint author), LAWRENCE BERKELEY LAB, DIV MAT SCI, CTR ADV MAT, BERKELEY, CA 94720 USA. RI Van Hove, Michel/A-9862-2008 OI Van Hove, Michel/0000-0002-8898-6921 NR 65 TC 0 Z9 0 U1 1 U2 2 PU ROYAL SOC PI LONDON PA 6-9 CARLTON HOUSE TERRACE, LONDON SW1Y 5AG, ENGLAND SN 0962-8444 J9 P R SOC-MATH PHYS SC JI P. Roy. Soc.-Math. Phys. Sci. PD JUL 8 PY 1993 VL 442 IS 1914 BP 61 EP 72 PG 12 GA LL727 UT WOS:A1993LL72700005 ER PT J AU SPARKS, LD CHAMBERLAIN, JR HSU, P ONDRIAS, MR SWANSON, BA DEMONTELLANO, PRO SHELNUTT, JA AF SPARKS, LD CHAMBERLAIN, JR HSU, P ONDRIAS, MR SWANSON, BA DEMONTELLANO, PRO SHELNUTT, JA TI RAMAN-SPECTROSCOPIC CHARACTERIZATION OF ISOMERS OF COPPER AND ZINC N-PHENYLPROTOPORPHYRIN IX DIMETHYL ESTER SO INORGANIC CHEMISTRY LA English DT Article ID PORPHYRIN FORCE-FIELD; N-15 SUBSTITUTED DERIVATIVES; RESONANCE RAMAN; MOLECULAR-STRUCTURE; NICKEL OCTAETHYLPORPHYRIN; ISOTOPE SHIFTS; SPECTRA; COMPLEXES; CRYSTAL; PHENYLHYDRAZINE AB The reaction of certain heme-containing proteins with phenylhydrazine results in N-phenylprotoporphyrin formation. N-substituted porphyrins are known to inhibit ferrochelatase and to be formed in the inactivation of hepatic cytochrome P450 by various agents. These molecules therefore play an important role in understanding the biological function of these enzymes. We have used molecular modeling in conjunction with resonance Raman and UV-visible absorption spectroscopies to investigate the structure of the four distal regioisomers of N-phenylprotoporphyrin IX dimethyl ester (NPhPPDME) metal derivatives. Regardless of which pyrrole ring (A, B, C, or D) bears the N-phenyl substituent, a novel distortion from planarity of the protoporphyrin macrocycle results from addition of the phenyl group. The molecular mechanics calculations for various isomers and conformers of copper(II)N-phenylprotoporphyrin IX predict structures similar to the structure reported for zinc N-phenyltetraphenylporphyrin (Kuila, D.; et al. J. Am. Chem Soc. 1984, 106, 448), with the major distortion from planarity occurring for the N-substituted pyrrole ring. Although the four isomers of CuNPhPPDME are all similar when contrasted with CuPPDME, closer examination of the vibrational structure allowed the isomers to be separated into two groups. Differences among pairs of isomers are apparent primarily in the vinyl vibrational modes and vinyl-sensitive porphyrin modes. Even more subtle spectral differences distinguish all of the isomers. We present arguments suggesting that the spectral characteristics are the result of electronic rather than kinematic effects. C1 SANDIA NATL LABS,FUEL SCI DEPT 6211,ALBUQUERQUE,NM 87185. UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. UNIV CALIF SAN FRANCISCO,SCH PHARM,DEPT PHARMACEUT CHEM,SAN FRANCISCO,CA 94143. RI Shelnutt, John/A-9987-2009 OI Shelnutt, John/0000-0001-7368-582X NR 39 TC 12 Z9 12 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD JUL 7 PY 1993 VL 32 IS 14 BP 3153 EP 3161 DI 10.1021/ic00066a029 PG 9 WC Chemistry, Inorganic & Nuclear SC Chemistry GA LL454 UT WOS:A1993LL45400029 ER PT J AU ASSINK, RA KAY, BD AF ASSINK, RA KAY, BD TI THE CHEMICAL-KINETICS OF SILICATE SOL-GELS - FUNCTIONAL-GROUP KINETICS OF TETRAETHOXYSILANE SO COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS LA English DT Article; Proceedings Paper CT RALPH K ILER MEMORIAL Symposium on the Colloid Chemistry of Silica, at the 200th National Meeting of the American-Chemical-Society CY AUG 26-30, 1990 CL WASHINGTON, DC SP AMER CHEM SOC, DIV COLLOIDS & SURFACE CHEM DE KINETICS; SOL-GEL; TETRAETHOXYSILANE ID NUCLEAR MAGNETIC-RESONANCE AB The functional group chemical kinetics of tetraethyoxysilane (TEOS) have been investigated by Si-29 NMR. The functional group analysis treats the concentration of the various functional groups (alkoxy, silanol and Si-O-Si bond) without reference to how they are distributed about the various silicon atoms. The functional group kinetics address the overall reaction pathways and the reaction mechanism. Previously, tetramethoxysilane (TMOS) was found to undergo acid-catalyzed reaction via both water- and alcohol-producing condensation processes. Acid-catalyzed TEOS condensation proceeds via only the water-producing reaction. These differences in the chemical kinetics of TMOS and TEOS affect the dependence of condensation rates on the water-to-silicon ratio of the solution. RP ASSINK, RA (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 14 TC 37 Z9 38 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-7757 J9 COLLOID SURFACE A JI Colloid Surf. A-Physicochem. Eng. Asp. PD JUL 6 PY 1993 VL 74 IS 1 BP 1 EP 5 DI 10.1016/0927-7757(93)80392-R PG 5 WC Chemistry, Physical SC Chemistry GA LQ825 UT WOS:A1993LQ82500002 ER PT J AU CERRINA, F RAYCHAUDHURI, AK NG, W LIANG, S SINGH, S WELNAK, JT WALLACE, JP CAPASSO, C UNDERWOOD, JH KORTRIGHT, JB PERERA, RCC MARGARITONDO, G AF CERRINA, F RAYCHAUDHURI, AK NG, W LIANG, S SINGH, S WELNAK, JT WALLACE, JP CAPASSO, C UNDERWOOD, JH KORTRIGHT, JB PERERA, RCC MARGARITONDO, G TI MICROSCOPIC-SCALE LATERAL INHOMOGENEITIES OF THE PHOTOEMISSION RESPONSE OF CLEAVED GAAS SO APPLIED PHYSICS LETTERS LA English DT Article ID SURFACE PHOTOVOLTAGE; INTERFACES; SPECTROSCOPY AB Photoelectron energy distribution spectra taken for the first time on micrometer-sized areas of cleaved GaAs(110) reveal rigid shifts from location to location in the photoemission core level peak energies, indicating band-bending changes on a microscopic scale. C1 LAWRENCE BERKELEY LAB,CTR XRAY OPT,BERKELEY,CA 94720. ECOLE POLYTECH FED LAUSANNE,INST PHYS APPL,CH-1015 LAUSANNE,SWITZERLAND. RP CERRINA, F (reprint author), UNIV WISCONSIN,CTR XRAY LITHOG,3731 SCHNEIDER DR,STOUGHTON,WI 53589, USA. RI Margaritondo, Giorgio/B-1367-2008 NR 15 TC 24 Z9 24 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 JUL 5 PY 1993 VL 63 IS 1 BP 63 EP 65 DI 10.1063/1.109698 PG 3 WC Physics, Applied SC Physics GA LK406 UT WOS:A1993LK40600022 ER PT J AU KEEBLE, DJ UMLOR, MT ASOKAKUMAR, P LYNN, KG COOKE, PW AF KEEBLE, DJ UMLOR, MT ASOKAKUMAR, P LYNN, KG COOKE, PW TI ANNEALING OF LOW-TEMPERATURE GAAS STUDIED USING A VARIABLE-ENERGY POSITRON BEAM SO APPLIED PHYSICS LETTERS LA English DT Article ID EPITAXY; DEFECT AB The annihilation characteristics of monoenergetic positrons implanted in a molecular beam epitaxy layer of low-temperature (LT) GaAs annealed at temperatures from 300 to 600-degrees-C were measured. A gallium vacancy concentration of approximately 3 X 10(17) cm-3 is inferred for the as-grown material. The S parameter increased significantly upon anneal to 500-degrees-C. The dominant positron traps in samples annealed at and below 400-degrees-C are distinct from those acting for samples annealed to 500 or 600-degrees-C. The change in S parameter for the 600-degrees-C annealed sample compared to the GaAs substrate, S(LT,600) = 1.047S(sub), is consistent with divacancies or larger open volume defects. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. GEOCENTERS INC,FT MONMOUTH OPERAT,EATONTOWN,NJ 07723. RP KEEBLE, DJ (reprint author), MICHIGAN TECHNOL UNIV,DEPT PHYS,HOUGHTON,MI 49931, USA. RI Keeble, David /C-6633-2012 OI Keeble, David /0000-0002-5378-799X NR 14 TC 22 Z9 22 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 5 PY 1993 VL 63 IS 1 BP 87 EP 89 DI 10.1063/1.109706 PG 3 WC Physics, Applied SC Physics GA LK406 UT WOS:A1993LK40600030 ER PT J AU LIN, XW BEHAR, M DESIMONI, J BERNAS, H WASHBURN, J LILIENTALWEBER, Z AF LIN, XW BEHAR, M DESIMONI, J BERNAS, H WASHBURN, J LILIENTALWEBER, Z TI LOW-TEMPERATURE ION-INDUCED EPITAXIAL-GROWTH OF ALPHA-FESI2 AND CUBIC FESI2 IN SI SO APPLIED PHYSICS LETTERS LA English DT Article ID BEAM SYNTHESIS; SILICON; BETA-FESI2; LAYERS; FILMS AB Ion-beam-induced epitaxial crystallization of amorphous Si implanted with Fe to 18 at. % peak concentration was studied. The structure of the specimen was characterized using transmission electron microscopy and Rutherford backscattering spectrometry. Both cubic FeSi2 and alpha-FeSi2 were formed in epitaxy with the Si matrix with two types of orientations (fully aligned and twinned). The twins of alpha-FeSi2 and those of cubic FeSi2 were found to have exactly the same type of epitaxial relationship as for the aligned ones. The thermodynamically stable beta-FeSi2 is not formed, demonstrating that ion-beam-induced crystallization can lead to preferential phase formation as well as to epitaxy. C1 CTR SPECTROMETRIE NUCL & SPECTROMETRIE MASSE,F-91405 ORSAY,FRANCE. RP LIN, XW (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Liliental-Weber, Zuzanna/H-8006-2012 NR 21 TC 47 Z9 47 U1 0 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 5 PY 1993 VL 63 IS 1 BP 105 EP 107 DI 10.1063/1.109727 PG 3 WC Physics, Applied SC Physics GA LK406 UT WOS:A1993LK40600036 ER PT J AU CHEN, WH PAUL, JAK BARBIERI, A VANHOVE, MA CAMERON, S DWYER, DJ AF CHEN, WH PAUL, JAK BARBIERI, A VANHOVE, MA CAMERON, S DWYER, DJ TI STRUCTURE DETERMINATION OF PT3TI(111) BY AUTOMATED TENSOR LEED SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID SURFACE SEGREGATION; RELIABILITY FACTORS; CO; ALLOY AB An analysis of low-energy electron diffraction (LEED) I-V spectra from the clean Pt3Ti(111) surface was performed by comparing measured intensities with data calculated using an automated tensor LEED program, which employs a directed search optimization procedure. It was found that the topmost layer is pure Pt and that the other layers have the bulk composition. The first and second interlayer spacings are 2.23 +/- 0.03 angstrom and 2.21 +/- 0.03 angstrom respectively, corresponding to a contraction of 0.9% and 1.8% of the bulk value. The perpendicular buckling is 0.04 angstrom +/-0.05 angstrom in the top layer and 0.15 angstrom +/-0.04 angstrom in the second layer. The results are in full accordance with previous investigations of the physical and chemical properties of this surface. C1 ROYAL INST TECHNOL,S-10044 STOCKHOLM 70,SWEDEN. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. EXXON RES & ENGN CO,ANNANDALE,NJ 08801. RI Van Hove, Michel/A-9862-2008 OI Van Hove, Michel/0000-0002-8898-6921 NR 28 TC 23 Z9 23 U1 0 U2 0 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 JUL 5 PY 1993 VL 5 IS 27 BP 4585 EP 4594 DI 10.1088/0953-8984/5/27/003 PG 10 WC Physics, Condensed Matter SC Physics GA LL710 UT WOS:A1993LL71000003 ER PT J AU HESKETT, D TANG, D SHI, X TSUEI, KD AF HESKETT, D TANG, D SHI, X TSUEI, KD TI WORK FUNCTION INVESTIGATIONS OF ALKALI COADSORBATE SYSTEMS SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID PROMOTED OXIDATION; OXYGEN-ADSORPTION; ELECTRONIC-STRUCTURE; ENHANCED OXIDATION; RU(001) SURFACE; CO-ADSORPTION; NA OVERLAYERS; POTASSIUM; COADSORPTION; CU(111) AB We have measured the work function changes induced by the coadsorption of oxygen or carbon monoxide with sodium as a function of alkali precoverage for the systems O2/Na/Cu(111), O2/Na/Ni(111), O2/Na/Cu(110), and CO/Na/Ni(111). In agreement with results for many other related systems, we observe anomalous work function decreases for initial doses of both O2 and CO for high alkali precoverages. Our results are inconsistent with the standard explanations. We propose a new model in which the work function changes can be accounted for by a competition between two elements: a work function increase due to the coadsorbate and a decrease due to coadsorbate-induced undepolarization of the alkali overlayer. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP HESKETT, D (reprint author), UNIV RHODE ISL,DEPT PHYS,KINGSTON,RI 02881, USA. NR 59 TC 15 Z9 15 U1 0 U2 0 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 JUL 5 PY 1993 VL 5 IS 27 BP 4601 EP 4610 DI 10.1088/0953-8984/5/27/005 PG 10 WC Physics, Condensed Matter SC Physics GA LL710 UT WOS:A1993LL71000005 ER PT J AU TRINGIDES, MC SOUKOULIS, CM LEVENBERG, P AF TRINGIDES, MC SOUKOULIS, CM LEVENBERG, P TI THE POWER-LAW TIME-DEPENDENCE OF (R2) IN NONEQUILIBRIUM GROWTH SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID DOMAIN GROWTH; MONTE-CARLO; ISING-MODEL; KINETICS; DIFFUSION; SURFACES AB Model systems evolving in time to attain equilibrium, with spin exchange dynamics, order by forming domains after a temperature quench within the ordered region. They are described in terms of time-dependent diffusion coefficients and a distribution of activation energies. This description is analogous to the relaxation in disordered systems such as a:Si-H (amorphous hydrogenated Si). C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP TRINGIDES, MC (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Soukoulis, Costas/A-5295-2008 NR 15 TC 3 Z9 3 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD JUL 5 PY 1993 VL 5 IS 27 BP 4721 EP 4728 DI 10.1088/0953-8984/5/27/016 PG 8 WC Physics, Condensed Matter SC Physics GA LL710 UT WOS:A1993LL71000016 ER PT J AU RABEONY, M PEIFFER, DG DOZIER, WD LIN, MY AF RABEONY, M PEIFFER, DG DOZIER, WD LIN, MY TI EVOLUTION OF STRUCTURE IN A GRAFT COPOLYMER HOMOPOLYMER BLEND UNDER STRAIN SO MACROMOLECULES LA English DT Article ID BLOCK COPOLYMERS; POLYMER; INTERFACES; MACROMONOMERS; POLYSTYRENE AB Two-dimensional light scattering and digital imaging studies of the structural evolution in a graft copolymer-homopolymer blend under quasi-static elongation are reported. The graft copolymer consists of a polydisperse elastomeric poly(ethyl acrylate) (PEA) backbone onto which monodisperse thermoplastic polystyrene (PS) chains are grafted. The homopolymer poly(ethyl acrylate) is produced in situ since grafts are not incorporated into every chain. The 'quasi-equilibrium'' structure of the graft copolymer blend cast from a good solvent exhibits isotropic scattering (i.e., appearance of a spinodal ring) with an inverse characteristic length q(m) almost-equal-to 4 mum-1. When the blend is subject to a quasi-static elongation ratio lambda (=final length/initial length), three regimes are observed: (i) A transition regime at very low elongation ratios where the system behaves reversibly. (ii) A hyperelastic regime where the spinodal ring deforms in an anisotropic manner, i.e., ellipsoid-shaped scattering elongated in the direction perpendicular to the applied strain. The intensity I(parallel-to) (q(z)) parallel to the elongation increases in an exponential manner due to cooperative alignment of the hard PS-rich phase, and its peak position shifts in an affine manner to smaller values (i.e., q(zm) approximately lambda-1). Moreover, the scattered light perpendicular to the elongation, I(perpendicular-to) (q(y)), decreases in intensity as its peak position q(ym) diverges to infinity. (iii) A plastic regime where I(parallel-to)(q(z)) remains nearly constant as its position q(zm) converges to a finite value at q(zm) almost-equal-to 0.9 mum-1. In the three regimes, the structure factor parallel to the elongation, S(parallel-to)(q(z)), remains self-similar. The underlying mechanism of the deformation will be discussed within the framework of concentration fluctuations in ''soft'' elastic two-component solids. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP RABEONY, M (reprint author), EXXON RES & ENGN CO,CORP RES SCI LABS,CLINTON TOWNSHIP,ROUTE 22 E,ANNANDALE,NJ 08801, USA. NR 28 TC 3 Z9 3 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JUL 5 PY 1993 VL 26 IS 14 BP 3676 EP 3680 DI 10.1021/ma00066a028 PG 5 WC Polymer Science SC Polymer Science GA LL417 UT WOS:A1993LL41700028 ER PT J AU RUANO, OA WADSWORTH, J WOLFENSTINE, J SHERBY, OD AF RUANO, OA WADSWORTH, J WOLFENSTINE, J SHERBY, OD TI EVIDENCE FOR NABARRO-HERRING CREEP IN METALS - FICTION OR REALITY SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID HARPER-DORN CREEP; POWER LAW CREEP; STRESS AB It is shown that all creep data in metals ascribed to the Nabarro-Herring (N-H) diffusional creep mechanism cannot in fact be definitively described by the N-H creep theory. Rather, the creep mechanism is associated with either Harper-Dorn (H-D) dislocation creep or grain boundary sliding (GBS). Specific responses are presented to work by Fiala and Langdon (F-L) who have presented opposing views to the above conclusions. Creep data for copper used by F-L to support N-H creep are shown to be incompatible with the theory, since the experimental creep rates are about three orders of magnitude higher than predicted. The copper creep data, however, can be predicted by phenomenological equations for GBS and H-D creep. It is concluded that as long as rigorous and physically sound theories for creep controlled by GBS and H-D creep are not forthcoming, researchers will continue to use, erroneously in the authors' view, the N-H diffusional creep mechanism to explain low stress creep behavior of polycrystalline solids. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF IRVINE,DEPT MECH & AEROSP ENGN,IRVINE,CA 92717. STANFORD UNIV,DEPT MAT SCI & ENGN,STANFORD,CA 94305. RP RUANO, OA (reprint author), CSIC,CENIM,AV GREGORIO AMO 8,E-28040 MADRID,SPAIN. RI Ruano, Oscar/H-1835-2015 OI Ruano, Oscar/0000-0001-6368-986X NR 42 TC 54 Z9 55 U1 0 U2 10 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 5 PY 1993 VL 165 IS 2 BP 133 EP 141 DI 10.1016/0921-5093(93)90747-3 PG 9 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA LP400 UT WOS:A1993LP40000006 ER PT J AU HSUEH, CH AF HSUEH, CH TI INTERFACIAL DEBONDING AND FIBER PULL-OUT STRESSES OF FIBER-REINFORCED COMPOSITES, X - WITH AN ELASTIC INTERFACIAL COATING SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID MATRIX COMPOSITES; CERAMICS AB Pull-out of a fiber with an elastic interfacial coating, which has been used to facilitate interfacial debonding for ceramic composites, from a matrix is considered. The effects of the interfacial coating on the stress transfer, and the interfacial shear stresses at both the fiber-coating and the coating-matrix interfaces are analyzed. The stress transfer by interfacial shear is more effective from a soft coating than from a stiff fiber to a matrix. However, the maximum interfacial shear stress depends on both the effectiveness of the stress transfer and the loading stress carried by the coating. This loading stress decreases with decreasing Young's modulus of the coating when a constant load is applied on the fiber-coating system. Hence, depending on the balance between the above two factors, a moderately soft coating is required to maximize the interfacial shear which, in turn, promotes interfacial debonding. The effects of coating thickness on stress transfer are also addressed. RP HSUEH, CH (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. RI Hsueh, Chun-Hway/G-1345-2011 NR 21 TC 12 Z9 13 U1 2 U2 6 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 5 PY 1993 VL 165 IS 2 BP 189 EP 195 DI 10.1016/0921-5093(93)90754-3 PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA LP400 UT WOS:A1993LP40000013 ER PT J AU BALL, J CHESNY, P COMBET, M FONTAINE, JM KUNNE, R LEMAIRE, MC SANS, JL BYSTRICKY, J LAC, CD LEHAR, F DELESQUEN, A DEMALI, M PERROTKUNNE, F VANROSSUM, L BACH, P DEMIERRE, P GAILLARD, G HESS, R RAPIN, D SORMANI, P GOUDOUR, JP BINZ, R KLETT, A ROSSLE, E SCHMITT, H BARABASH, LS JANOUT, Z KHACHATUROV, BA USOV, YA LOPIANO, D SPINKA, H AF BALL, J CHESNY, P COMBET, M FONTAINE, JM KUNNE, R LEMAIRE, MC SANS, JL BYSTRICKY, J LAC, CD LEHAR, F DELESQUEN, A DEMALI, M PERROTKUNNE, F VANROSSUM, L BACH, P DEMIERRE, P GAILLARD, G HESS, R RAPIN, D SORMANI, P GOUDOUR, JP BINZ, R KLETT, A ROSSLE, E SCHMITT, H BARABASH, LS JANOUT, Z KHACHATUROV, BA USOV, YA LOPIANO, D SPINKA, H TI ANGULAR-DEPENDENCE OF THE BEAM AND TARGET ANALYZING POWERS A(OONO) AND A(OOON) IN NP ELASTIC-SCATTERING BETWEEN 0.477 AND 0.940 GEV SO NUCLEAR PHYSICS A LA English DT Article DE H-1 (POLARIZED N,N); E=0.477-0.94 GEV; MEASURED ANALYZING POWER; POLARIZED FROZEN-SPIN TARGET ID PROTON AB We present a total of 273 independent data points of the analyzing powers A(oono) (np) and A(ooon) (np) in a large angular interval at four energies between 0.477 and 0.940 GeV. The SATURNE II polarized beam of free neutrons obtained from the break-up of polarized deuterons was scattered on the polarized Saclay frozen-spin proton target. Part of the data was obtained with a CH2 target. A comparison of the two measured observables allows one to determine the polarization of the neutron beam. The present results provide an important contribution to any future theoretical or phenomenological analysis. C1 CTR ETUD SACLAY,DAPNIA,SPLN,F-91191 GIF SUR YVETTE,FRANCE. LAB NATL SATURNE,IN2P3,CNRS,F-91191 GIF SUR YVETTE,FRANCE. CTR ETUD SACLAY,CEA,DSM,F-91191 GIF SUR YVETTE,FRANCE. UNIV GENEVA,DPNC,CH-1211 GENEVA 4,SWITZERLAND. CENB,F-33170 GRADIGNAN,FRANCE. UNIV FREIBURG,FAC PHYS,W-7800 FREIBURG,GERMANY. JINR,LNP,MOSCOW 101000,RUSSIA. ANL,HEP,ARGONNE,IL 60439. NR 8 TC 14 Z9 14 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUL 5 PY 1993 VL 559 IS 4 BP 477 EP 488 DI 10.1016/0375-9474(93)90256-W PG 12 WC Physics, Nuclear SC Physics GA LW886 UT WOS:A1993LW88600001 ER PT J AU BALL, J CHESNY, P COMBET, M FONTAINE, JM LAC, CD SANS, JL BYSTRICKY, J LEHAR, F DELESQUEN, A DEMALI, M PERROTKUNNE, F VANROSSUM, L AHMIDOUCH, A BACH, P DEMIERRE, P GAILLARD, G HESS, R KUNNE, R RAPIN, D SORMANI, P GOUDOUR, JP BINZ, R KLETT, A ROSSLE, E SCHMITT, H LOPIANO, D SPINKA, H AF BALL, J CHESNY, P COMBET, M FONTAINE, JM LAC, CD SANS, JL BYSTRICKY, J LEHAR, F DELESQUEN, A DEMALI, M PERROTKUNNE, F VANROSSUM, L AHMIDOUCH, A BACH, P DEMIERRE, P GAILLARD, G HESS, R KUNNE, R RAPIN, D SORMANI, P GOUDOUR, JP BINZ, R KLETT, A ROSSLE, E SCHMITT, H LOPIANO, D SPINKA, H TI ANGULAR-DEPENDENCE OF ANALYZING POWER IN NP ELASTIC-SCATTERING BETWEEN 0.312 AND 1.10 GEV SO NUCLEAR PHYSICS A LA English DT Article DE H-1 (POLARIZED N,N); E = 0.8-1.1 GEV; MEASURED SPIN CORRELATION PARAMETER; POLARIZED FROZEN-SPIN TARGET ID DEUTERON POLARIZED BEAM; CROSS-SECTIONS; SATURNE-II; PROTON; NUCLEON; PARAMETER; ENERGIES AB We present a total of 427 np analyzing power data points in a large angular interval at 12 energies between 0.312 and 1.10 GeV. The SATURNE II polarized beam of free monochromatic neutrons was scattered either on the Saclay frozen-spin polarized proton target or on CH2 and C targets. Present results are compared with existing elastic and quasieleastic data. C1 CTR ETUD SACLAY,DAPNIA,SPLN,F-911911 GIF SUR YVETTE,FRANCE. CTR ETUD SACLAY,CEA,DSM,F-91191 GIF SUR YVETTE,FRANCE. UNIV GENEVA,DPNC,CH-1209 GENEVA 4,SWITZERLAND. CENB,F-33170 GRADIGNAN,FRANCE. UNIV FREIBURG,FAC PHYS,W-7800 FREIBURG,GERMANY. ANL,HEP,ARGONNE,IL 60439. NR 18 TC 23 Z9 23 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUL 5 PY 1993 VL 559 IS 4 BP 489 EP 510 DI 10.1016/0375-9474(93)90257-X PG 22 WC Physics, Nuclear SC Physics GA LW886 UT WOS:A1993LW88600002 ER PT J AU BALL, J CHESNY, P COMBET, M FONTAINE, JM LAC, CD LEMAIRE, MC SANS, JL BYSTRICKY, J LEHAR, F DELESQUEN, A DEMALI, M PERROTKUNNE, F VANROSSUM, L BACH, P DEMIERRE, P GAILLARD, G HESS, R KUNNE, R RAPIN, D SORMANI, P VUARIDEL, B GOUDOUR, JP BINZ, R KLETT, A ROSSLE, E SCHMITT, H BARABASH, LS JANOUT, Z KHACHATUROV, BA USOV, YA LOPIANO, D SPINKA, H AF BALL, J CHESNY, P COMBET, M FONTAINE, JM LAC, CD LEMAIRE, MC SANS, JL BYSTRICKY, J LEHAR, F DELESQUEN, A DEMALI, M PERROTKUNNE, F VANROSSUM, L BACH, P DEMIERRE, P GAILLARD, G HESS, R KUNNE, R RAPIN, D SORMANI, P VUARIDEL, B GOUDOUR, JP BINZ, R KLETT, A ROSSLE, E SCHMITT, H BARABASH, LS JANOUT, Z KHACHATUROV, BA USOV, YA LOPIANO, D SPINKA, H TI ANGULAR-DEPENDENCE OF THE SPIN CORRELATION PARAMETER A(OONN) IN NP ELASTIC-SCATTERING BETWEEN 0.8 AND 1.1 GEV SO NUCLEAR PHYSICS A LA English DT Article DE H-1 (POLARIZED N,N); E=0.8-1.1 GEV; MEASURED SPIN CORRELATION PARAMETER; POLARIZED FROZEN-SPIN TARGET ID PROTON; BEAM AB We present a total of 323 data points of the spin correlation parameter A(oonn)(np) in a large angular interval at eight energies between 0.8 and 1.1 GeV. The SATURNE II polarized beam of free neutrons obtained from the break-up of polarized deuterons was scattered on the polarized Saclay frozen-spin proton target. The present data are the first existing results above 0.8 GeV. C1 CTR ETUD SACLAY,DAPNIA,SPLN,F-91191 GIF SUR YVETTE,FRANCE. CTR ETUD SACLAY,CEA,DSM,F-91191 GIF SUR YVETTE,FRANCE. LAB NATL SATURNE,IN2P3,CNRS,F-91191 GIF SUR YVETTE,FRANCE. UNIV GENEVA,DPNC,CH-1211 GENEVA 4,SWITZERLAND. CENB,F-33170 GRADIGNAN,FRANCE. UNIV FREIBURG,FAC PHYS,W-7800 FREIBURG,GERMANY. JINR,LNP,MOSCOW 101000,RUSSIA. ANL,HEP,ARGONNE,IL 60439. NR 11 TC 9 Z9 9 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD JUL 5 PY 1993 VL 559 IS 4 BP 511 EP 525 DI 10.1016/0375-9474(93)90258-Y PG 15 WC Physics, Nuclear SC Physics GA LW886 UT WOS:A1993LW88600003 ER PT J AU BAGGER, J DAWSON, S VALENCIA, G AF BAGGER, J DAWSON, S VALENCIA, G TI EFFECTIVE-FIELD THEORY OF ANOMALOUS GAUGE-BOSON COUPLINGS AT HIGH-ENERGY PP-COLLIDERS SO NUCLEAR PHYSICS B LA English DT Article ID CHIRAL PERTURBATION-THEORY; SYMMETRY-BREAKING SCHEMES; STRONGLY INTERACTING WS; STRONG W+W+ SCATTERING; WW SCATTERING; RADIATIVE-CORRECTIONS; TECHNICOLOR THEORIES; EQUIVALENCE THEOREM; WEAK-INTERACTIONS; ELECTROWEAK PARAMETERS AB We compute the effects of anomalous gauge-boson couplings at high-energy hadron colliders using next-to-leading order SU(2) X SU(2) chiral perturbation theory. By comparing the yields from the universal p2 terms with those arising from new physics at order p4, we estimate the sensitivity of the SSC and LHC to the indirect effects of electroweak symmetry breaking. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. FERMILAB NATL ACCELERATOR LAB,THEORY GRP,BATAVIA,IL 60510. RP BAGGER, J (reprint author), JOHNS HOPKINS UNIV HOSP,DEPT PHYS & ASTRON,BALTIMORE,MD 21218, USA. NR 74 TC 76 Z9 76 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD JUL 5 PY 1993 VL 399 IS 2-3 BP 364 EP 394 DI 10.1016/0550-3213(93)90501-F PG 31 WC Physics, Particles & Fields SC Physics GA LM583 UT WOS:A1993LM58300003 ER PT J AU DESHPANDE, A ALLIEGRO, C CHALOUPKA, V EGGER, J GORDON, HA HADLEY, NJ HEROLD, WD KASPAR, H LEE, AM LAZARUS, DM LUBATTI, HJ MA, H REHAK, P SHUKLA, A ZELLER, ME ZHAO, T AF DESHPANDE, A ALLIEGRO, C CHALOUPKA, V EGGER, J GORDON, HA HADLEY, NJ HEROLD, WD KASPAR, H LEE, AM LAZARUS, DM LUBATTI, HJ MA, H REHAK, P SHUKLA, A ZELLER, ME ZHAO, T TI DETERMINATION OF THE BRANCHING RATIO OF THE DECAY PI(0)-]E(+)E(-) SO PHYSICAL REVIEW LETTERS LA English DT Article ID RADIATIVE-CORRECTIONS; PSEUDOSCALAR MESON; RARE DECAY; SEARCH AB Employing the decay chain K+ --> pi+pi0, pi0 --> e+e- we have observed the decay pi0 --> e+e-. With a signal sample of almost-equal-to 21 events we measure the branching ratio for pi0 --> e+e- to be (6.9 +/-2.3 +/- 0.6) x 10(-8), normalized to the decay K+ --> pi+pi0, pi0 --> e+e-gamma. This result is consistent with the unitarity lower bound and the published 90% confidence level upper limit of 13 x 10(-8). C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV MARYLAND,COLL PK,MD 20742. SWISS INST NUCL RES,PAUL SCHERRER INST,CH-5234 VILLIGEN,SWITZERLAND. UNIV WASHINGTON,DEPT PHYS,SEATTLE,WA 98195. RP DESHPANDE, A (reprint author), YALE UNIV,DEPT PHYS,NEW HAVEN,CT 06511, USA. NR 17 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 JUL 5 PY 1993 VL 71 IS 1 BP 27 EP 30 DI 10.1103/PhysRevLett.71.27 PG 4 WC Physics, Multidisciplinary SC Physics GA LK368 UT WOS:A1993LK36800008 ER PT J AU MCFARLAND, KS BRIERE, RA CHEU, E HARRIS, DA MAKOFF, G ROODMAN, A SCHWINGENHEUER, B SOMALWAR, SV WAH, YW WINSTEIN, B WINSTON, R ARISAKA, K ROBERTS, D SLATER, W WEAVER, M BARKER, AR SWALLOW, EC BOCK, GJ COLEMAN, R CRISLER, M ENAGONIO, J FORD, R HSIUNG, YB JENSEN, DA RAMBERG, E TSCHIRHART, R COLLINS, EM GOLLIN, GD NAKAYA, T YAMANAKA, T GU, P HAAS, P HOGAN, WP KIM, SK MATTHEWS, JN MYUNG, SS SCHNETZER, S THOMSON, GB ZOU, Y AF MCFARLAND, KS BRIERE, RA CHEU, E HARRIS, DA MAKOFF, G ROODMAN, A SCHWINGENHEUER, B SOMALWAR, SV WAH, YW WINSTEIN, B WINSTON, R ARISAKA, K ROBERTS, D SLATER, W WEAVER, M BARKER, AR SWALLOW, EC BOCK, GJ COLEMAN, R CRISLER, M ENAGONIO, J FORD, R HSIUNG, YB JENSEN, DA RAMBERG, E TSCHIRHART, R COLLINS, EM GOLLIN, GD NAKAYA, T YAMANAKA, T GU, P HAAS, P HOGAN, WP KIM, SK MATTHEWS, JN MYUNG, SS SCHNETZER, S THOMSON, GB ZOU, Y TI MEASUREMENT OF THE BRANCHING RATIO OF PI(0)-]E(+)E(-) FROM PI(0)S PRODUCED BY K(L)-]PI(0)PI(0)PI(0) DECAYS IN FLIGHT SO PHYSICAL REVIEW LETTERS LA English DT Article ID RADIATIVE-CORRECTIONS; FORM-FACTOR AB The Fermilab E799 Collaboration has carried out a search for the rare decay pi0 --> e+e- using pi0's produced from K(L) --> pi0pi0pi0 decays in flight. We observe a signal of nine events with an e+e-mass close to the pi0 mass where only one event is predicted from other known processes. From this, we measure B(pi0 --> e+e-, (m(ee)/m(pi0))2 > 0.95) = [7.6(-2.8)+3.9(stat) +/- 0.5 (syst)] x 10(-8), over and above the contribution from pi0 Dalitz decays. Correcting for radiative effects, we find this result consistent with theoretical expectations from standard-model processes. C1 UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV COLORADO,BOULDER,CO 80309. ELMHURST COLL,ELMHURST,IL 60126. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV ILLINOIS,URBANA,IL 61801. OSAKA UNIV,DEPT PHYS,TOYONAKA,OSAKA 560,JAPAN. RUTGERS UNIV,PISCATAWAY,NJ 08855. RP MCFARLAND, KS (reprint author), UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637, USA. RI Briere, Roy/N-7819-2014; Kim, Sun Kee/G-2042-2015 OI Briere, Roy/0000-0001-5229-1039; Kim, Sun Kee/0000-0002-0013-0775 NR 21 TC 16 Z9 16 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 5 PY 1993 VL 71 IS 1 BP 31 EP 34 DI 10.1103/PhysRevLett.71.31 PG 4 WC Physics, Multidisciplinary SC Physics GA LK368 UT WOS:A1993LK36800009 ER PT J AU VAGINS, MR ADAIR, RK GREENLEE, HB KASHA, H MANNELLI, EB OHL, KE SCHMIDT, MP JASTRZEMBSKI, E LARSEN, RC LEIPUNER, LB MORSE, WM SCHWARZ, CB AF VAGINS, MR ADAIR, RK GREENLEE, HB KASHA, H MANNELLI, EB OHL, KE SCHMIDT, MP JASTRZEMBSKI, E LARSEN, RC LEIPUNER, LB MORSE, WM SCHWARZ, CB TI MEASUREMENT OF THE BRANCHING RATIO FOR K(L)-]E(+)E(-)E(+)E(-) SO PHYSICAL REVIEW LETTERS LA English DT Article ID FORM-FACTOR; DECAY; KL->E+E-GAMMA AB We report on a measurement of the branching ratio for the K(L) double Dalitz decay K(L) --> e+e-e+e-. The result, based on the observation of six events, is B(K(L) --> e+e-e+e-) = (3.07 +/- 1.25 +/- 0.26) x 10(-8). C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. VASSAR COLL,DEPT PHYS & ASTRON,POUGHKEEPSIE,NY 12601. RP VAGINS, MR (reprint author), YALE UNIV,DEPT PHYS,NEW HAVEN,CT 06511, USA. NR 15 TC 11 Z9 11 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 5 PY 1993 VL 71 IS 1 BP 35 EP 37 DI 10.1103/PhysRevLett.71.35 PG 3 WC Physics, Multidisciplinary SC Physics GA LK368 UT WOS:A1993LK36800010 ER PT J AU ANDERSSON, LR BURGDORFER, J AF ANDERSSON, LR BURGDORFER, J TI EXCITATION IONIZATION AND DOUBLE-IONIZATION OF HELIUM BY HIGH-ENERGY PHOTON IMPACT SO PHYSICAL REVIEW LETTERS LA English DT Article ID PHOTOIONIZATION; ELECTRONS AB The ratio of double to single ionization by photoabsorption is calculated for photon impact energies in the range 2-18 keV. Employing the acceleration form of the dipole operator and representing the electron-electron correlation in the final state by a Coulomb distortion factor, R=sigma++/sigma+ approaches an asymptotic value of 1.66% and reaches a value of about 2.5% at 2 keV photon energy. Comparison with experimental data shows good agreement when contributions due to Compton scattering are taken into account. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP ANDERSSON, LR (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 24 TC 100 Z9 100 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 JUL 5 PY 1993 VL 71 IS 1 BP 50 EP 53 DI 10.1103/PhysRevLett.71.50 PG 4 WC Physics, Multidisciplinary SC Physics GA LK368 UT WOS:A1993LK36800014 ER PT J AU SHIRLEY, EL LOUIE, SG AF SHIRLEY, EL LOUIE, SG TI ELECTRON EXCITATIONS IN SOLID C-60 - ENERGY-GAP, BAND DISPERSIONS, AND EFFECTS OF ORIENTATIONAL DISORDER SO PHYSICAL REVIEW LETTERS LA English DT Article ID NORM-CONSERVING PSEUDOPOTENTIALS; SEMICONDUCTORS; INSULATORS AB Electron excitation energies and photoemission spectra in undoped, solid C60 are calculated using a quasiparticle approach. The effects of orientational disorder and electron correlations are studied. We find a band gap of 2.15 eV, in good agreement with experiment, and approximately 1 eV widths for the highest-occupied-molecular-orbital (HOMO) and lowest-unoccupied-molecular-orbital (LUMO) bands. Calculated angle-resolved, inverse photoemission spectra for the LUMO bands show very little angular dependence, explaining recent experimental work on epitaxial thin films. The present results suggest that undoped, solid C60 is a standard band insulator. C1 LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. RP UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. NR 25 TC 174 Z9 174 U1 2 U2 23 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 JUL 5 PY 1993 VL 71 IS 1 BP 133 EP 136 DI 10.1103/PhysRevLett.71.133 PG 4 WC Physics, Multidisciplinary SC Physics GA LK368 UT WOS:A1993LK36800035 ER PT J AU MATTSON, JE KUMAR, S FULLERTON, EE LEE, SR SOWERS, CH GRIMSDITCH, M BADER, SD PARKER, FT AF MATTSON, JE KUMAR, S FULLERTON, EE LEE, SR SOWERS, CH GRIMSDITCH, M BADER, SD PARKER, FT TI PHOTOINDUCED ANTIFERROMAGNETIC INTERLAYER COUPLING IN FE/(FE-SI) SUPERLATTICES SO PHYSICAL REVIEW LETTERS LA English DT Article ID EXCHANGE; PERIOD; OSCILLATIONS; TRANSITION AB We report photoinduced antiferromagnetic (AF) interlayer coupling in sputtered Fe/(Fe-Si) superlattices. The superlattices are intrinsically AF coupled at room temperature and become increasingly ferromagnetically coupled when cooled below 100 K, but the AF coupling is restored at low temperature by exposure to visible light of sufficient intensity ( > 10 mW/mm2). These effects are due to charge carriers in the Fe-Si spacer layer which, when thermally or optically generated, are capable of communicating spin information between the Fe layers. C1 KOREA UNIV,DEPT MET ENGN,SEOUL 136701,SOUTH KOREA. UNIV CALIF SAN DIEGO,CTR MAGNET RECORDING RES,LA JOLLA,CA 92093. RP MATTSON, JE (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013; Fullerton, Eric/H-8445-2013 OI Fullerton, Eric/0000-0002-4725-9509 NR 25 TC 112 Z9 112 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 JUL 5 PY 1993 VL 71 IS 1 BP 185 EP 188 DI 10.1103/PhysRevLett.71.185 PG 4 WC Physics, Multidisciplinary SC Physics GA LK368 UT WOS:A1993LK36800048 ER PT J AU RAMDAS, AK RODRIGUEZ, S GRIMSDITCH, M ANTHONY, TR BANHOLZER, WF AF RAMDAS, AK RODRIGUEZ, S GRIMSDITCH, M ANTHONY, TR BANHOLZER, WF TI EFFECT OF ISOTOPIC CONSTITUTION OF DIAMOND ON ITS ELASTIC-CONSTANTS - C-13 DIAMOND, THE HARDEST KNOWN MATERIAL SO PHYSICAL REVIEW LETTERS LA English DT Article ID CRYSTALS; GROWTH AB Elastic moduli of C-13 diamond, deduced from the Brillouin shifts experienced by inelastically scattered monochromatic radiation, are approximately 0.5% higher than the corresponding values for natural diamond. This suggests C-13 diamond is harder than natural diamond. A simple model incorporating the zero-point motion and the anharmonicity of the interatomic forces is proposed; it explains quantitatively the increase in the elastic moduli, the decrease in the lattice parameter, and a correction to the Raman frequency beyond its M-1/2 dependence (where M is the average atomic mass) observed for C-13 diamond with respect to their values for natural diamond. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. GE CO,CORP RES & DEV,SCHENECTADY,NY 12309. RP RAMDAS, AK (reprint author), PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907, USA. NR 27 TC 53 Z9 53 U1 2 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 5 PY 1993 VL 71 IS 1 BP 189 EP 192 DI 10.1103/PhysRevLett.71.189 PG 4 WC Physics, Multidisciplinary SC Physics GA LK368 UT WOS:A1993LK36800049 ER PT J AU SAMSON, JAR GREENE, CH BARTLETT, RJ AF SAMSON, JAR GREENE, CH BARTLETT, RJ TI MEASUREMENT OF THE RATIO OF DOUBLE-TO-SINGLE PHOTOIONIZATION OF HELIUM AT 2.8 KEV USING SYNCHROTRON-RADIATION - COMMENT SO PHYSICAL REVIEW LETTERS LA English DT Note C1 UNIV COLORADO,DEPT PHYS,BOULDER,CO 80309. UNIV COLORADO,NATL INST STAND & TECHNOL,JOINT INST LAB ASTROPHYS,BOULDER,CO 80309. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SAMSON, JAR (reprint author), UNIV NEBRASKA,DEPT PHYS & ASTRON,LINCOLN,NE 68588, USA. RI Greene, Chris/C-3821-2011 OI Greene, Chris/0000-0002-2096-6385 NR 12 TC 60 Z9 60 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 5 PY 1993 VL 71 IS 1 BP 201 EP 201 DI 10.1103/PhysRevLett.71.201 PG 1 WC Physics, Multidisciplinary SC Physics GA LK368 UT WOS:A1993LK36800052 ER PT J AU SCHMIDT, L SUN, JJ FRITZ, JS HAGEN, DF MARKELL, CG WISTED, EE AF SCHMIDT, L SUN, JJ FRITZ, JS HAGEN, DF MARKELL, CG WISTED, EE TI SOLID-PHASE EXTRACTION OF PHENOLS USING MEMBRANES LOADED WITH MODIFIED POLYMERIC RESINS SO JOURNAL OF CHROMATOGRAPHY LA English DT Article ID LIQUID-CHROMATOGRAPHY; WATER AB Membranes impregnated with polystyrene-divinylbenzene (PS-DVB) or acetyl-PS-DVB resin beads were use for solid-phase extraction of ppm (w/w) concentrations of phenols from aqueous samples. A macro procedure uses 47 x 0.5 mm disks with 200-500 ml sample volumes at ca. 200 ml/min flow-rates. A smaller-scale procedure uses a thicker disk (3 mm) packed into a conventional solid-phase extraction column (7 mm I.D.). The retained phenols are eluted from the disk with organic solvent, and the individual phenols are determined quantitatively by GC or HPLC. Recoveries for 16 different phenols, including those included in the US Environmental Protection Agency list of priority pollutants, averaged 98% with a standard deviation of +/-2%. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,332 WILHELM HALL,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. THREE M CO,RES CTR,ST PAUL,MN 55144. NR 12 TC 70 Z9 70 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD JUL 2 PY 1993 VL 641 IS 1 BP 57 EP 61 DI 10.1016/0021-9673(93)83458-5 PG 5 WC Chemistry, Analytical SC Chemistry GA LL529 UT WOS:A1993LL52900007 ER PT J AU MURRAY, S LYNCH, AM KNIZE, MG GOODERHAM, NJ AF MURRAY, S LYNCH, AM KNIZE, MG GOODERHAM, NJ TI QUANTIFICATION OF THE CARCINOGENS 2-AMINO-3,8-DIMETHYL-IMIDAZO[4,5-F]QUINOXALINE AND 2-AMINO-3,4,8-TRIMETHYLIMIDAZO[4,5-F]QUINOXALINE AND 2-AMINO-1-METHYL-6-PHENYLIMIDAZO[4,5-B]PYRIDINE IN FOOD USING A COMBINED ASSAY BASED ON GAS CHROMATOGRAPHY-NEGATIVE ION MASS-SPECTROMETRY SO JOURNAL OF CHROMATOGRAPHY-BIOMEDICAL APPLICATIONS LA English DT Article ID COOKED-BEEF; MUTAGENS; PRODUCTS; AMINES; MEIQX AB A gas chromatographic-mass spectrometric assay has been developed for the measurement of 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline (MeIQx), 2-amino-3,4,8-trimethylimidazo[4,5-f]quinoxaline (DiMeIQx) and 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) in food. Stable isotope-labelled analogues of MeIQx and PhIP are used as internal standards and the synthesis of deuterated PhIP is described. The mass spectrometer is operated in the electron-capture negative ion chemical ionisation mode and the amines are chromatographed as their di-3,5-bistrifluoromethylbenzyl derivatives. All three compounds can be measured in a single chromatographic run and detection limits of 0.05, 0.1 and 0.2 ng/g for MeIQx, DiMeIQx and PhIP, respectively, in food are obtained. Various home-cooked and commercially prepared foodstuffs were analysed with this assay and several were found to contain measurable amounts of one or more of the three amines. These results are presented and discussed. C1 LAWRENCE LIVERMORE NATL LAB,DIV BIOMED,LIVERMORE,CA 94550. LAWRENCE LIVERMORE NATL LAB,DIV ENVIRONM SCI,LIVERMORE,CA 94550. RP MURRAY, S (reprint author), ROYAL POSTGRAD MED SCH,DEPT CLIN PHARMACOL,DUCANE RD,LONDON W12 0NN,ENGLAND. FU NCI NIH HHS [NCI RO1-CA40811, CA40895-02]; NIEHS NIH HHS [NIEHS 22YO1-ES-10063] NR 13 TC 116 Z9 116 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4347 J9 J CHROMATOGR-BIOMED JI J. Chromatogr.-Biomed. Appl. PD JUL 2 PY 1993 VL 616 IS 2 BP 211 EP 219 DI 10.1016/0378-4347(93)80388-K PG 9 WC Chemistry, Analytical SC Chemistry GA LM640 UT WOS:A1993LM64000006 PM 8376502 ER PT J AU LARESE, JZ AF LARESE, JZ TI MULTILAYER ARGON FILMS ON GRAPHITE - STRUCTURAL AND MELTING PROPERTIES SO ACCOUNTS OF CHEMICAL RESEARCH LA English DT Review ID CRYSTAL FLUID INTERFACE; NEUTRON-DIFFRACTION; PHASE-TRANSITIONS; TRILAYER FILMS; VAPOR SYSTEMS; DYNAMICS; LAYER; SCATTERING; SIMULATION; MONOLAYER RP LARESE, JZ (reprint author), BROOKHAVEN NATL LAB, DEPT CHEM, UPTON, NY 11973 USA. NR 56 TC 18 Z9 18 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0001-4842 J9 ACCOUNTS CHEM RES JI Accounts Chem. Res. PD JUL PY 1993 VL 26 IS 7 BP 353 EP 360 DI 10.1021/ar00031a001 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA LU702 UT WOS:A1993LU70200001 ER PT J AU SHARP, SL WARMACK, RJ GOUDONNET, JP LEE, I FERRELL, TL AF SHARP, SL WARMACK, RJ GOUDONNET, JP LEE, I FERRELL, TL TI SPECTROSCOPY AND IMAGING USING THE PHOTON SCANNING TUNNELING MICROSCOPE SO ACCOUNTS OF CHEMICAL RESEARCH LA English DT Review C1 OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831. NR 15 TC 31 Z9 31 U1 2 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0001-4842 J9 ACCOUNTS CHEM RES JI Accounts Chem. Res. PD JUL PY 1993 VL 26 IS 7 BP 377 EP 382 DI 10.1021/ar00031a004 PG 6 WC Chemistry, Multidisciplinary SC Chemistry GA LU702 UT WOS:A1993LU70200004 ER PT J AU LEE, H COLELLA, R CHAPMAN, LD AF LEE, H COLELLA, R CHAPMAN, LD TI PHASE DETERMINATION OF X-RAY REFLECTIONS IN A QUASI-CRYSTAL SO ACTA CRYSTALLOGRAPHICA SECTION A LA English DT Article ID BRAGG SCATTERING; DIFFRACTION AB Multiple Bragg diffraction effects have been observed in an Al-Cu-Fe quasicrystal. The experimental data are analyzed by means of a multibeam perturbation theory. Good fits are obtained between experimental and calculated profiles. The feasibility for phase determination of structure factors is demonstrated. It is found that there is no inversion symmetry in Al-Cu Fe. C1 BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP LEE, H (reprint author), PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907, USA. NR 15 TC 18 Z9 18 U1 1 U2 2 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-7673 J9 ACTA CRYSTALLOGR A JI Acta Crystallogr. Sect. A PD JUL 1 PY 1993 VL 49 BP 600 EP 605 DI 10.1107/S0108767392013175 PN 4 PG 6 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA LY132 UT WOS:A1993LY13200002 ER PT J AU ZUREK, WH AF ZUREK, WH TI COSMIC STRINGS IN LABORATORY SUPERFLUIDS AND THE TOPOLOGICAL REMNANTS OF OTHER PHASE-TRANSITIONS SO ACTA PHYSICA POLONICA B LA English DT Article ID COSMOLOGY; DYNAMICS AB Superfluid phase transition in He-4 can be accomplished through pressure quench on a short (dynamical) timescale. ''Vacuum condensate'' of the new, broken symmetry phase is the wavefunction of the superfluid Bose condensate with a certain ''trapped'' distribution of vortex lines. Analogous phase transitions from the false to the true vacuum are expected to occur in the early universe. There they are thought to leave behind topological defects such as strings. I calculate the density of strings (i.e., vortex lines) predicted by the application of the cosmological scenario to He-4. The proposed experiment tests key elements of the standard cosmological scenario for creation of topological defects - known as the Kibble mechanism - in a cryogenic setting. Analogous experiments can be performed in superconductors as well as in either phase of He-3, and have been already carried out by Yurke and his co-workers in liquid crystals. RP ZUREK, WH (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 30 TC 153 Z9 153 U1 0 U2 3 PU POLISH ACAD SCIENCES INST PHYSICS PI WARSAW PA AL LOTNIKOW 32-46, 02-668 WARSAW, POLAND SN 0587-4254 J9 ACTA PHYS POL B JI Acta Phys. Pol. B PD JUL PY 1993 VL 24 IS 7 BP 1301 EP 1311 PG 11 WC Physics, Multidisciplinary SC Physics GA LR149 UT WOS:A1993LR14900006 ER PT J AU DAUSKARDT, RH RITCHIE, RO COX, BN AF DAUSKARDT, RH RITCHIE, RO COX, BN TI FATIGUE OF ADVANCED MATERIALS .1. SO ADVANCED MATERIALS & PROCESSES LA English DT Article C1 ROCKWELL INT CORP,CTR SCI,THOUSAND OAKS,CA 91360. RP DAUSKARDT, RH (reprint author), LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720, USA. RI Ritchie, Robert/A-8066-2008 OI Ritchie, Robert/0000-0002-0501-6998 NR 0 TC 4 Z9 4 U1 1 U2 1 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 JUL PY 1993 VL 144 IS 1 BP 26 EP & PG 0 WC Materials Science, Multidisciplinary SC Materials Science GA LU448 UT WOS:A1993LU44800006 ER PT J AU DAISEY, JM HOPKE, PK AF DAISEY, JM HOPKE, PK TI POTENTIAL FOR ION-INDUCED NUCLEATION OF VOLATILE ORGANIC-COMPOUNDS BY RADON DECAY IN INDOOR ENVIRONMENTS SO AEROSOL SCIENCE AND TECHNOLOGY LA English DT Article ID DEPOSITION; POLONIUM-218; CLUSTERS; VAPOR; AIR; NEUTRALIZATION; POLLUTANTS; CHEMICALS; AEROSOLS; PROGENY AB The theoretical potential for the formation of clusters of vapor-phase organic compounds found in indoor air around the (PoOx+)-Po-218 ion was investigated as well as which compounds were most likely to form clusters. A compilation or measurements of indoor organic compounds has been made for future experiments and theoretical calculations by the radon research community. Forty-four volatile and semivolatile organic compounds out of the more than 300 that have been reported in indoor air were investigated. Water vapor was included for comparison. The results indicate that there is a potential for the formation of clusters of organic compounds around the (PoOx+)-Po-218 ion. The compounds with the greatest potential for cluster formation are the volatile oxidized hydrocarbons (e.g., n-butanol, phenol, hexanal, nonanal, benzaldehyde, the ketones, and the acetates) and the semivolatile organic compounds (pentachlorophenol, nicotine, chlordane, chlorpyrifos). Although the estimated diameters are consistent with the measured diameters for the ''unattached'' fraction, the state of experimental and theoretical knowledge in this area is not sufficiently developed to judge the quantitative validity of these predictions. C1 CLARKSON UNIV,DEPT CHEM,POTSDAM,NY 13699. RP DAISEY, JM (reprint author), LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,INDOOR ENVIRONM PROGRAM,90-3058,BERKELEY,CA 94720, USA. RI Hopke, Philip/C-6020-2008 OI Hopke, Philip/0000-0003-2367-9661 NR 48 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0278-6826 J9 AEROSOL SCI TECH JI Aerosol Sci. Technol. PD JUL PY 1993 VL 19 IS 1 BP 80 EP 93 DI 10.1080/02786829308959623 PG 14 WC Engineering, Chemical; Engineering, Mechanical; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA LH429 UT WOS:A1993LH42900009 ER PT J AU GUPTA, A NOVICK, VJ BISWAS, P MONSON, PR AF GUPTA, A NOVICK, VJ BISWAS, P MONSON, PR TI EFFECT OF HUMIDITY AND PARTICLE HYGROSCOPICITY ON THE MASS LOADING CAPACITY OF HIGH-EFFICIENCY PARTICULATE AIR (HEPA) FILTERS SO AEROSOL SCIENCE AND TECHNOLOGY LA English DT Article ID REACTOR; GROWTH AB The effect of humidity, particle hygroscopicity, and size on the mass loading capacity of glass fiber high efficiency particulate air filters was studied. Above the deliquescent point, the pressure drop across the filter increased nonlinearly with areal loading density (mass collected / filtration area) or a NaCl aerosol, thus significantly reducing the mass loading capacity of the filter compared to dry hygroscopic or nonhygroscopic particle mass loadings. The specific cake resistance K2 was computed for different test conditions and used as a measure of the mass loading capacity. K2 was found to decrease with increasing humidity for nonhygroscopic aluminum oxide particles and for hygroscopic NaCl particles (at humidities below the deliquescent point). It is postulated that an increase in humidity leads to the formation of a more open particulate cake which lowers the pressure drop for a given mass loading. A formula for predicting K2 for lognormally distributed aerosols (parameters obtained from impactor data) was derived. The resistance factor, R, calculated using this formula was compared to the theoretical R calculated using the Rudnick-Happel expression. For the nonhygroscopic aluminum oxide, the agreement was good but for the hygroscopic sodium chloride, due to large variation in the cake porosity estimates, the agreement was poor. C1 UNIV CINCINNATI,DEPT CIVIL ENGN,CINCINNATI,OH 45221. ARGONNE NATL LAB,DIV ENGN PHYS,ARGONNE,IL 60439. WESTINGHOUSE SAVANNAH RIVER CO,AIKEN,SC 29802. NR 17 TC 43 Z9 43 U1 1 U2 11 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 JUL PY 1993 VL 19 IS 1 BP 94 EP 107 DI 10.1080/02786829308959624 PG 14 WC Engineering, Chemical; Engineering, Mechanical; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA LH429 UT WOS:A1993LH42900010 ER PT J AU MYERS, G AF MYERS, G TI ASSIMILATING HIV SEQUENCES SO AIDS RESEARCH AND HUMAN RETROVIRUSES LA English DT Editorial Material ID SIMIAN IMMUNODEFICIENCY VIRUS; ENVELOPE GLYCOPROTEIN; TYPE-1 GP120; CELL TROPISM; IDENTIFICATION; DETERMINANT; EVOLUTION; PATHOGENICITY; GLYCOSYLATION; DOMAINS RP MYERS, G (reprint author), LOS ALAMOS NATL LAB,THEORET BIOL & BIOPHYS GRP,LOS ALAMOS,NM 87545, USA. NR 34 TC 15 Z9 15 U1 0 U2 0 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0889-2229 J9 AIDS RES HUM RETROV JI Aids Res. Hum. Retrovir. PD JUL PY 1993 VL 9 IS 7 BP 697 EP 702 DI 10.1089/aid.1993.9.697 PG 6 WC Immunology; Infectious Diseases; Virology SC Immunology; Infectious Diseases; Virology GA LQ607 UT WOS:A1993LQ60700016 PM 8369174 ER PT J AU ABE, M GOTO, T KENNEL, SJ WOLFENBARGER, D MACY, SD WEISS, DT SOLOMON, A AF ABE, M GOTO, T KENNEL, SJ WOLFENBARGER, D MACY, SD WEISS, DT SOLOMON, A TI PRODUCTION AND IMMUNODIAGNOSTIC APPLICATIONS OF ANTIHUMAN LIGHT-CHAIN MONOCLONAL-ANTIBODIES SO AMERICAN JOURNAL OF CLINICAL PATHOLOGY LA English DT Article ID V REGION SUBGROUPS; B-CELL; PREFERENTIAL ASSOCIATION; HUMAN-IMMUNOGLOBULINS; LAMBDA CHAINS; KAPPA; AMYLOIDOSIS; PROTEINS; EPITOPES; URINE AB Hybridomas producing antihuman light chain monoclonal antibodies (MoAbs) were derived from fusion of SP2/O mouse myeloma cells with splenic lymphocytes from mice repeatedly immunized with purified kappa- and lambda-type Bence Jones proteins representative of the major V(kappa) (V(kappaI), V(kappaII), V(kappaIII), V(kappaIV)) and V(lambda) (V(lambdaI), V(lambdaII/V) V(lambdaIII), V(lambdaIV), V(lambdaVI)) subgroups or gene families. Monoclonal antibodies were obtained that had specificity for constant-region (C(L)) determinants common to all kappa or lambda light chains (C(kappa) and C(lambda), respectively) as well as for variable-region (V(L)) epitopes unique to each of the V(kappa) or V(lambda) subgroups. The capability of these reagents to recognize C(L) and V(L) determinants on monoclonal immunoglobulin (Ig) molecules was demonstrated in fluid-phase antigen-capturing enzyme-linked immunosorbent assay (ELISA), solid-phase ELISA, and immunoblotting. In addition, these antilight chain MoAbs were used to establish immunocytochemically the kappa or lambda type and V(L)-subgroup nature of light chains expressed by the cytoplasmic Ig of monoclonal plasma cell and surface Ig of B-lymphocyte populations, respectively. These antibodies facilitated the immunohistochemical detection and characterization of light-chain-associated amyloid (AL amyloid) and other types of light-chain-related tissue deposits. Furthermore, the anti-C(L)-specific MoAbs were used to measure serum and urinary Igkappa and Iglambda concentrations. Quantification of Bence Jones protein excretion, even in the presence of other urinary proteins, was possible using the highly sensitive anti-C(kappa) and anti-C(lambda) MoAbs reactive only with free light chains. The ability to identify and characterize, through the use of these antihuman light chain MoAbs, light-chain-related epitopes at the protein, cellular, and tissue level has clinical importance in the diagnosis and treatment of patients with monoclonal plasma cell and related B-cell immunoproliferative diseases. C1 UNIV TENNESSEE,MED CTR,GRAD SCH MED,DEPT MED,HUMAN IMMUNOL & CANC PROGRAM,1924 ALCOA HIGHWAY,KNOXVILLE,TN 37920. UNIV TOKUSHIMA,DEPT MED 1,TOKUSHIMA 770,JAPAN. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37830. FU NCI NIH HHS [CA 10056] NR 30 TC 44 Z9 44 U1 0 U2 4 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0002-9173 J9 AM J CLIN PATHOL JI Am. J. Clin. Pathol. PD JUL PY 1993 VL 100 IS 1 BP 67 EP 74 PG 8 WC Pathology SC Pathology GA LM750 UT WOS:A1993LM75000014 PM 7688492 ER PT J AU MATHEZ, EA BLACIC, JD MAGGIORE, C MITCHELL, TE FOGEL, RA AF MATHEZ, EA BLACIC, JD MAGGIORE, C MITCHELL, TE FOGEL, RA TI THE DETERMINATION OF THE O CONTENT OF DIAMOND BY MICROACTIVATION SO AMERICAN MINERALOGIST LA English DT Article ID CARBON; SPECTRA; OXYGEN AB A microactivation technique has been developed to determine the O content of diamond. The target is bombarded with an energetic beam of He-3(2+) from a tandem accelerator to generate the reaction (O(He,p)F)-O-16-He-3-F-18. The F-18 decays to O-18 (t1/2 = 109.8 min) by positron emission, and the decay activity is measured by coincidence counting. For most experiments the He-3 beam was focused to diameters of 300-800 mum, which essentially defines analytical spatial resolution, since the analytical depth is only almost-equal-to 8 mum. The technique gives consistent results and can be used to determine O contents of diamond to concentrations of < 5 ppm (atomic). Errors vary from 14 to 19% for concentrations of < 1 00 ppm. Most of the 28 diamond samples analyzed contain 10-100 ppm 0 (atomic) in spots that upon subsequent microscopic examination were found to be free of inclusions, cracks, and other defects. No other elements, such as those that would suggest that 0 is present in submicroscopic mineral inclusions, are associated with the 0. However, in several samples with higher concentrations the 0 is believed to be localized in submicroscopic cracks. The analyzed samples are from the kimberlites of Monastery and Finsch, South Africa; Orapa, Botswana; Muji Mayi, Zaire; and unknown localities. They include natural types I and IIa diamond, a yellow synthetic diamond sample, and samples from which both eclogitic and peridotitic mineral inclusions had been extracted. Among them are two that contained inclusions of the reduced phase SiC. No systematic relationships of 0 content with location, diamond type, or inclusion association are evident. In particular, the SiC-bearing diamond is not depleted in 0 compared with the other diamond samples. Dislocation densities of two type Ila diamond samples were determined by TEM. It was found that there are not enough dislocations or defects to account for all the 0 in such diamond samples, indicating that 0 is present in the diamond structure. The diamond samples were also analyzed by FTIR spectroscopy. The spectra contain no bands indicative of C-O bonds. It is hypothesized that 0 is present in interstitial sites in the diamond structure and, on the basis of the analogy with synthetic diamond and other substances that undergo faceted growth, that the 0 content of diamond is controlled primarily by the kinetics of the growing surface rather than by equilibrium thermodynamic conditions or crystal defect structure. C1 LOS ALAMOS NATL LAB,GEOL & GEOCHEM GRP,DIV EARTH & ENVIRONM SCI,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP MATHEZ, EA (reprint author), AMER MUSEUM NAT HIST,DEPT MINERAL SCI,NEW YORK,NY 10024, USA. NR 34 TC 4 Z9 4 U1 0 U2 1 PU MINERALOGICAL SOC AMER PI WASHINGTON PA 1130 17TH ST NW SUITE 330, WASHINGTON, DC 20036 SN 0003-004X J9 AM MINERAL JI Am. Miner. PD JUL-AUG PY 1993 VL 78 IS 7-8 BP 753 EP 761 PG 9 WC Geochemistry & Geophysics; Mineralogy SC Geochemistry & Geophysics; Mineralogy GA LT314 UT WOS:A1993LT31400008 ER PT J AU ZWEIBEL, K AF ZWEIBEL, K TI THIN-FILM PHOTOVOLTAIC CELLS SO AMERICAN SCIENTIST LA English DT Article RP ZWEIBEL, K (reprint author), NREL,DEPT ENERGY PROGRAM,PV PROGRAM,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 7 TC 3 Z9 3 U1 1 U2 4 PU SIGMA XI-SCI RES SOC PI RES TRIANGLE PK PA PO BOX 13975, RES TRIANGLE PK, NC 27709 SN 0003-0996 J9 AM SCI JI Am. Scientist PD JUL-AUG PY 1993 VL 81 IS 4 BP 362 EP 369 PG 8 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LP028 UT WOS:A1993LP02800016 ER PT J AU BAJT, S CLARK, SB SUTTON, SR RIVERS, ML SMITH, JV AF BAJT, S CLARK, SB SUTTON, SR RIVERS, ML SMITH, JV TI SYNCHROTRON X-RAY MICROPROBE DETERMINATION OF CHROMATE CONTENT USING X-RAY-ABSORPTION NEAR-EDGE STRUCTURE SO ANALYTICAL CHEMISTRY LA English DT Article ID OXIDATION; MINERALS; CHROMIUM(III); RADIATION; SPECTRA AB X-ray absorption near-edge structure (XANES) has been applied to the quantitative analysis of chromate (CrO42-) content in oxides, silicate glasses, and simulated cementitous waste forms. The method uses the normalized area of a pre-edge peak (bound-state transition) in XANES spectra acquired with the synchrotron X-ray microprobe on beam line X26A at the National Synchrotron Light Source. The estimated accuracy of the technique is +/- 5% in terms of Cr6+/total Cr. The minimum detection limit approaches 10 ppm Cr6+ using a 150-mum synchrotron X-ray beam. These results demonstrate the value of synchrotron-based microXANES for the nondestructive quantification of the first-row transition metal species present as tetrahedral oxyanions. C1 UNIV CHICAGO,CTR ADV RADIAT SOURCES,CHICAGO,IL 60637. BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. RP BAJT, S (reprint author), UNIV CHICAGO,DEPT GEOPHYS SCI,CHICAGO,IL 60637, USA. RI Bajt, Sasa/G-2228-2010 NR 37 TC 129 Z9 130 U1 1 U2 13 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD JUL 1 PY 1993 VL 65 IS 13 BP 1800 EP 1804 DI 10.1021/ac00061a026 PG 5 WC Chemistry, Analytical SC Chemistry GA LJ380 UT WOS:A1993LJ38000028 ER PT J AU SMITH, RD WAHL, JH GOODLETT, DR HOFSTADLER, SA AF SMITH, RD WAHL, JH GOODLETT, DR HOFSTADLER, SA TI CAPILLARY ELECTROPHORESIS/MASS SPECTROMETRY SO ANALYTICAL CHEMISTRY LA English DT Article ID IONIZATION MASS-SPECTROMETRY; ZONE ELECTROPHORESIS; ELECTROSPRAY-IONIZATION; LIQUID-CHROMATOGRAPHY; PROTEINS; PEPTIDES; INTERFACE; MOLECULES RP SMITH, RD (reprint author), PACIFIC NW LAB, DEPT CHEM SCI, CHEM METHODS & SEPARAT GRP, RICHLAND, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 50 TC 143 Z9 143 U1 0 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD JUL 1 PY 1993 VL 65 IS 13 BP A574 EP A584 DI 10.1021/ac00061a001 PG 11 WC Chemistry, Analytical SC Chemistry GA LJ380 UT WOS:A1993LJ38000002 ER PT J AU BRISBIN, IL AUSTAD, SN AF BRISBIN, IL AUSTAD, SN TI THE USE OF TRAINED DOGS TO DISCRIMINATE HUMAN SCENT - A REPLY SO ANIMAL BEHAVIOUR LA English DT Note ID ODOR C1 HARVARD UNIV,BIOL LABS,CAMBRIDGE,MA 02138. RP BRISBIN, IL (reprint author), SAVANNAH RIVER ECOL LAB,PO DRAWER E,AIKEN,SC 29802, USA. NR 8 TC 3 Z9 3 U1 1 U2 8 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0003-3472 J9 ANIM BEHAV JI Anim. Behav. PD JUL PY 1993 VL 46 IS 1 BP 191 EP 192 DI 10.1006/anbe.1993.1175 PG 2 WC Behavioral Sciences; Zoology SC Behavioral Sciences; Zoology GA LL658 UT WOS:A1993LL65800020 ER PT J AU JONES, MT PATRICK, ML AF JONES, MT PATRICK, ML TI THE LANCZOS-ALGORITHM FOR THE GENERALIZED SYMMETRICAL EIGENPROBLEM ON SHARED-MEMORY ARCHITECTURES SO APPLIED NUMERICAL MATHEMATICS LA English DT Article; Proceedings Paper CT 13TH WORLD CONGRESS OF THE INTERNATIONAL ASSOC FOR MATHEMATICS AND COMPUTERS IN SIMULATION : COMPUTATION AND APPLIED MATHEMATICS CY JUL 22-26, 1991 CL DUBLIN, IRELAND SP INT ASSOC MATH & COMP SIMULAT AB The generalized eigenvalue problem, Kx = lambda Mx, is of significant practical importance, for example, in structural engineering where it arises as the vibration and buckling problems. The paper describes the implementation of a solver based on the Lanczos algorithm, LANZ, on two shared-memory architectures, the CRAY Y-MP and Encore Multimax. Issues arising from implementing linear algebra operations on a multivector processor are examined. Portability between a multivector processor and a simple multiprocessor is discussed. A model is developed and used to predict the performance of LANZ on shared-memory architectures. Performance results from some practical problems are given and analyzed. C1 DUKE UNIV,DEPT COMP SCI,DURHAM,NC 27706. RP JONES, MT (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 24 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9274 J9 APPL NUMER MATH JI Appl. Numer. Math. PD JUL PY 1993 VL 12 IS 5 BP 377 EP 389 DI 10.1016/0168-9274(93)90099-D PG 13 WC Mathematics, Applied SC Mathematics GA LR147 UT WOS:A1993LR14700002 ER PT J AU BENNETT, JM TAKACS, PZ AF BENNETT, JM TAKACS, PZ TI SURFACE-ROUGHNESS AND SCATTERING - PAPERS FROM THE 1ST TOPICAL MEETING SO APPLIED OPTICS LA English DT Article C1 BROOKHAVEN NATL LAB, DIV INSTRUMENTAT, UPTON, NY 11973 USA. RP BENNETT, JM (reprint author), USN, CTR AIR WARFARE, MICHELSON LAB, RES DEPT, DIV WEAPONS, CHINA LAKE, CA 93555 USA. NR 3 TC 3 Z9 3 U1 0 U2 1 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 JUL 1 PY 1993 VL 32 IS 19 BP 3333 EP 3334 PG 2 WC Optics SC Optics GA LK405 UT WOS:A1993LK40500001 PM 20829951 ER PT J AU CHURCH, EL TAKACS, PZ AF CHURCH, EL TAKACS, PZ TI SPECIFICATION OF SURFACE FIGURE AND FINISH IN TERMS OF SYSTEM PERFORMANCE SO APPLIED OPTICS LA English DT Article DE X-RAY IMAGING; SURFACE SCATTERING; SURFACE FINISH; SURFACE FIGURE; FRACTAL SURFACES; SURFACE SPECIFICATION ID SCATTERING AB We describe methods of predicting the degradation of the performance of a simple imaging system in terms of the statistics of the shape errors of the focusing element and, conversely, of specifying those statistics in terms of requirements on image quality. Results are illustrated for normal-incidence, x-ray mirrors with figure errors plus conventional and/or fractal finish errors. It is emphasized that the imaging properties of a surface with fractal errors are well behaved even though fractal-power spectra diverge at low spatial frequencies. C1 BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. RP CHURCH, EL (reprint author), USA ARDEC, PICATINNY ARSENAL, NJ 07806 USA. NR 12 TC 46 Z9 46 U1 0 U2 5 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 JUL 1 PY 1993 VL 32 IS 19 BP 3344 EP 3353 PG 10 WC Optics SC Optics GA LK405 UT WOS:A1993LK40500003 PM 20829953 ER PT J AU KULP, TJ GARVIS, D KENNEDY, R SALMON, T COOPER, K AF KULP, TJ GARVIS, D KENNEDY, R SALMON, T COOPER, K TI DEVELOPMENT AND TESTING OF A SYNCHRONOUS-SCANNING UNDERWATER IMAGING-SYSTEM CAPABLE OF RAPID 2-DIMENSIONAL FRAME IMAGING SO APPLIED OPTICS LA English DT Article AB The design and construction of a synchronous-scanning underwater imaging system capable of rapid two-dimensional scanning are described. The imager employs a 7-W, all-lines, argon-ion laser in conjunction with a galvanometrically driven raster scanner and an image-dissector tube receiver. The imager is capable of directly generating real-time RS-170 video imagery. The results of an in-water test of the imaging system, in which a high-contrast imaging test pattern was imaged, demonstrate opereting ranges of up to 4 attenuation lengths (AL) when the test was run at real-time frame rates, ranges of 5. 1-5.5 AL when the system operated with an eight-frame running average, and ranges of 6.3 AL when a 128-frame running average was used. The system performance was compared with that of floodlight/silicon-intensified-target TV camera configurations, which produced a maximum imaging range of approximately 2.6 AL. Also, an imaging configuration that used the raster-scanned beam of the laser as an illumination source for the silicon-intensified-target camera was tested. That system had an ultimate range of approximately 4 AL. C1 USN, OFF SALVAGE & DIVING, SEA SYST COMMAND, WASHINGTON, DC 20362 USA. RP KULP, TJ (reprint author), LAWRENCE LIVERMORE NATL LAB, DIV ENVIRONM SCI, MS L-524, POB 5507, LIVERMORE, CA 94551 USA. NR 18 TC 14 Z9 16 U1 0 U2 5 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 JUL 1 PY 1993 VL 32 IS 19 BP 3520 EP 3530 PG 11 WC Optics SC Optics GA LK405 UT WOS:A1993LK40500026 PM 20829976 ER PT J AU KRAMER, KJ TALWAR, S CAREY, PG ISHIDA, E ASHKENAS, D WEINER, KH SIGMON, TW AF KRAMER, KJ TALWAR, S CAREY, PG ISHIDA, E ASHKENAS, D WEINER, KH SIGMON, TW TI IMPURITY DISTRIBUTION AND ELECTRICAL CHARACTERISTICS OF BORON-DOPED SI1-XGEX/SI P(+)/N HETEROJUNCTION DIODES PRODUCED USING PULSED UV-LASER-INDUCED EPITAXY AND GAS-IMMERSION LASER DOPING SO APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING LA English DT Article ID EXCIMER-LASER; ALLOYS; SI; LAYERS; GE; FABRICATION; PARAMETERS; SHALLOW AB A two-step pulsed UV-laser process which independently controls the metallurgical and electrical junction depth of a Si1-xGex/Si heterojunction diode has been implemented. Pulsed Laser-Induced Epitaxy (PLIE) combined with Gas-immersion Laser Doping (GILD) are used to fabricate boron-doped heteroepitaxial p+/N Si1-xGex/Si layers and diodes. Borontrifluoride is used as the gaseous dopant source in the GILD process step. Boron incorporation and activation are investigated as a function of laser energy fluence and the number of laser pulses using SIMS and Hall-effect measurements. The dose of incorporated dopant is on the order of 10(13) cm-2 per pulse. The B profiles obtained are flat except for a peak at the interface resulting from segregation effects. The B and Ge distributions are compared with shifts in the turn-on voltage of p+/N Si1-xGex/Si heterojunction diodes produced by the process. The GILD/PLIE process is spatially selective with the resulting diodes fabricated being quasiplanar. Hole mobilities in the heavily doped Si1-xGex films are found to be slightly lower than in comparable Si films. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. STANFORD UNIV,DEPT ELECT ENGN,STANFORD,CA 94305. RP KRAMER, KJ (reprint author), STANFORD UNIV,STANFORD ELECTR LABS,STANFORD,CA 94305, USA. NR 23 TC 5 Z9 5 U1 0 U2 1 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013 USA SN 0947-8396 J9 APPL PHYS A-MATER JI Appl. Phys. A-Mater. Sci. Process. PD JUL PY 1993 VL 57 IS 1 BP 91 EP 95 DI 10.1007/BF00331223 PG 5 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA LP594 UT WOS:A1993LP59400015 ER PT J AU COWAN, DL PRIEST, V LEVY, SS AF COWAN, DL PRIEST, V LEVY, SS TI ESR DATING OF QUARTZ FROM EXILE HILL, NEVADA SO APPLIED RADIATION AND ISOTOPES LA English DT Article ID RESONANCE AB Quartz crystals from a geological site dated at 13 Myr contain paramagnetic lattice defects produced by exposure to in situ radiation. Two of these defects, both ESR active, contain information about the age of the mineral. From a gamma-ray sensitive ESR signal of unknown identity we infer a lower age bound: T greater-than-or-equal-to 7 Myr. The superoxide radical (''peroxy'') defect, produced naturally by alpha recoil and reproduced artificially by fast-neutron irradiation, gives a compatible age estimate independent of gamma dose: T = 8.7 +/- 2.6 Myr. C1 LOS ALAMOS NATL LAB,DIV EARTH & ENVIRONM SCI,LOS ALAMOS,NM 87544. RP COWAN, DL (reprint author), UNIV MISSOURI,DEPT PHYS,COLUMBIA,MO 65211, USA. NR 16 TC 0 Z9 0 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0969-8043 J9 APPL RADIAT ISOTOPES JI Appl. Radiat. Isot. PD JUL PY 1993 VL 44 IS 7 BP 1035 EP 1039 DI 10.1016/0969-8043(93)90008-X PG 5 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Chemistry; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA LK583 UT WOS:A1993LK58300008 ER PT J AU CHEUNG, NH YEUNG, ES AF CHEUNG, NH YEUNG, ES TI SINGLE-SHOT ELEMENTAL ANALYSIS OF LIQUIDS BASED ON LASER VAPORIZATION AT FLUENCES BELOW BREAKDOWN SO APPLIED SPECTROSCOPY LA English DT Article DE SPECTROCHEMICAL ANALYSIS OF LIQUIDS; PULSED LASER VAPORIZATION; ACOUSTIC NORMALIZATION; ATOMIC EMISSION SPECTROSCOPY; SINGLE-SHOT PRECISION ID SPECTROSCOPY; SPECTROMETRY; AEROSOLS AB A novel yet simple spectrochemical technique for analyzing liquid samples has been demonstrated, which is based on pulsed laser vaporization at sub-breakdown fluences, together with acoustic normalization for improved precision. By the use of ArF laser vaporization of NaCl solution as a test case, a dynamic range of three orders of magnitude was realized, and as little as 0.23 ppm of Na can be detected. Because of the high precision and small focal volume, the absolute detectability can be as low as 0.4 pg (20 fmol). ArF laser vaporization of KCl and BaCl2 was also investigated, and detection limits of 1.5 ppm and 130 ppm were established for K and Ba, respectively. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. HONG KONG BAPTIST COLL,DEPT PHYS,HONG KONG,HONG KONG. NR 25 TC 35 Z9 37 U1 0 U2 7 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA PO BOX 1438, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD JUL PY 1993 VL 47 IS 7 BP 882 EP 886 DI 10.1366/0003702934415192 PG 5 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA LP011 UT WOS:A1993LP01100005 ER PT J AU KO, DG LEE, JY OBRIEN, J OESTERREICHER, H TAYLOR, RD AF KO, DG LEE, JY OBRIEN, J OESTERREICHER, H TAYLOR, RD TI SUPERCONDUCTING AND MAGNETIC-PROPERTIES OF MATERIALS WITH VARYING CLUSTERING IN YBA2 (CU1-XMX)3O] WITH M = FE, CO, NI SO APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF AND EXHIBITION ON WORLD CONGRESS ON SUPERCONDUCTIVITY CY SEP 15-18, 1992 CL MUNICH, GERMANY ID THERMAL TREATMENTS AB We present structural, magnetic and superconducting properties of conventionally, and reductively prepared equilibrium states of YBa2(Cu1-xMx)3Oy with M = Fe, Co, Ni. Depending on preparation conditions, varying clustering tendencies for M on Cu(I) are found. A highly ordered cluster state (U) manifests itself in relatively high T(c) and strong orthorhombicities amongst others. This has to do with the partial condensation of M into cluster domain walls. Mode and conditions for this clustering are different for different M. As an example, maximum values of T(c) at a given x are found at lower annealing temperatures for M = Co compared to Fe both, experimentally and on a local thermodynamic model. Comparisons of this model with data from Mossbauer spectroscopy are drawn. The clustered M = Fe materials show an increase in critical currents through flux pinning on the Fe clusters, indicating technological potential. C1 LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545. RP KO, DG (reprint author), UNIV CALIF SAN DIEGO,DEPT CHEM 0317,LA JOLLA,CA 92093, USA. NR 6 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0964-1807 J9 APPL SUPERCOND JI Appl. Supercond. PD JUL-SEP PY 1993 VL 1 IS 7-9 BP 1099 EP 1102 DI 10.1016/0964-1807(93)90417-Z PG 4 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA LG392 UT WOS:A1993LG39200025 ER PT J AU DESTEESE, JG DAGLE, JE KREID, DK HANER, JM MYERS, WE AF DESTEESE, JG DAGLE, JE KREID, DK HANER, JM MYERS, WE TI BENEFIT COST COMPARISONS OF SMES IN SYSTEM-SPECIFIC APPLICATION SCENARIOS SO APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF AND EXHIBITION ON WORLD CONGRESS ON SUPERCONDUCTIVITY CY SEP 15-18, 1992 CL MUNICH, GERMANY ID MAGNETIC ENERGY-STORAGE AB The inherently high storage efficiency, instantaneous dispatch capability, and multifunction uses of superconducting magnetic energy storage (SMES) are attributes that give it the potential for widespread application in the electric utility industry. Opportunities appear to exist where SMES at a given location could provide multiple benefits either simultaneously or sequentially as system conditions dictate. These benefits, including diurnal storage and system stability and dynamic control enhancement, increase the application potential of SMES to a larger number of opportunities than might be justified by the value of its diurnal storage capability alone. However, the benefits an individual utility may realize from SMES applications are strongly influenced by the characteristics of the utility system, the location of the SMES unit, and the timing of its installation in the system. Such benefits are typically not evaluated adequately in generic studies. This paper summarizes results of case studies performed by Pacific Northwest Laboratory (PNL) with funding provided by the Bonneville Power Administration (BPA) and the Electric Power Research Institute (EPRI). The derivation of SMES benefits and costs are described and benefit/cost (B/C) ratios are compared in system-specific scenarios of interest to BPA. Results of using the DYNASTORE production cost model show the sensitivity of B/C ratios to SMES capacity and power and to the forecast system load. Intermediate-size SMES applications, which primarily provide system stability and dynamic control enhancement are reviewed. The potential for SMES to levelize the output of a wind energy complex is also assessed. Most of the cases show SMES to provide a positive net benefit with the additional, sometimes surprising indication, that B/C ratios and net present worth of intermediate-size units can exceed those of larger systems. C1 BONNEVILLE POWER ADM, PORTLAND, OR 97208 USA. RP DESTEESE, JG (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 16 TC 2 Z9 3 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 JUL-SEP PY 1993 VL 1 IS 7-9 BP 1425 EP 1434 DI 10.1016/0964-1807(93)90450-G PG 10 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA LG392 UT WOS:A1993LG39200058 ER PT J AU EBERLING, JL REED, BR BAKER, MG JAGUST, WJ AF EBERLING, JL REED, BR BAKER, MG JAGUST, WJ TI COGNITIVE CORRELATES OF REGIONAL CEREBRAL BLOOD-FLOW IN ALZHEIMERS-DISEASE SO ARCHIVES OF NEUROLOGY LA English DT Article ID PHOTON-EMISSION TOMOGRAPHY; ANTERIOR-POSTERIOR; DEMENTIA; MEMORY; LOCALIZATION; PERFORMANCE; PATTERNS; LESIONS; BRAIN; PET AB Objective.-To study the relationship between relative regional cerebral blood flow (rCBF) and performance on a variety of neuropsychological tests in a group of subjects with Alzheimer's disease. Design.-Analysis of the relationship between relative rCBF and neuropsychological performance using stepwise multiple regressions and Pearson Product-Moment Correlation coefficients. Setting.-University dementia clinic and research laboratory. Participants.-Twelve mildly demented patients with Alzheimer's disease (Mini-Mental State examination [MMSE] scores, 24 to 29; age, 56 to 78 years); 38 moderately demented patients with Alzheimer's disease (MMSE scores, 0 to 23; age, 59 to 86 years); and eight normal control subjects (MMSE scores, 27 to 30; age, 61 to 79 years). Main Outcome Measures.-Single photon emission computed tomography and the blood flow tracer N-isopropyl-p-iodoamphetamine iodine 123 were used to measure relative rCBF. Cognitive performance was assessed by grouping neuropsychological tests into clusters reflecting frontal lobe abilities, perseveration, memory, and visuoconstructive abilities. Results.-While MMSE score was a significant (P<.05) predictor of visuoconstruction, frontal lobe, and memory cluster scores, relative rCBF was a weaker predictor of neuropsychological performance, with only right orbitofrontal relative rCBF emerging as a significant (P<.05) predictor of the frontal cluster score and right parietal relative rCBF as a significant (P<.05) predictor of the visuoconstruction cluster score. Conclusions.-These results support our a priori grouping of neuropsychological tests into frontal and visuoconstruction clusters and suggest that these two clusters are good measures of frontal and parietal lobe function, respectively. C1 UNIV CALIF DAVIS,DEPT NEUROL,DAVIS,CA 95616. UNIV CALIF DAVIS,ALZHEIMERS DIS CTR,DAVIS,CA 95616. RP EBERLING, JL (reprint author), LAWRENCE BERKELEY LAB,CTR FUNCT IMAGING,55-121,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. FU NIA NIH HHS [AG10129, AG07793] NR 40 TC 31 Z9 31 U1 2 U2 2 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0003-9942 J9 ARCH NEUROL-CHICAGO JI Arch. Neurol. PD JUL PY 1993 VL 50 IS 7 BP 761 EP 766 PG 6 WC Clinical Neurology SC Neurosciences & Neurology GA LL116 UT WOS:A1993LL11600016 PM 8323482 ER PT J AU SPINRAD, H DEY, A YATES, M DICKINSON, M VANBREUGEL, W AF SPINRAD, H DEY, A YATES, M DICKINSON, M VANBREUGEL, W TI 3C-364 - A STEEP-SPECTRUM RADIO GALAXY AT Z=0.92 SO ASTRONOMICAL JOURNAL LA English DT Article ID REDSHIFT; MAPS AB 3C 364 has many of the credentials of a luminous radio galaxy at very high redshift: faint optica magnitude (m(R) = 22), ultrasteep radio spectrum (alpha = 1.29), and apparent multimodal galaxy morphology associated with (but nearly perpendicular to) a small (2'') double radio source. However, our spectroscopy shows it to be at a relatively modest redshift of z = 0.917. Its spectrum is dominated by a red stellar continuum and strong [O II] emission. The infrared magnitude of 3C 364 is K = 17.27, typical for 3CR and 1 Jy-class radio galaxies at z approximately 0.9, Its radio luminosity [log10 P1.4 GHz,rest(W Hz-1) = 27.711 is much smaller than the distant 4C radio galaxies with comparably steep radio spectra. We emphasize that AGN radio properties correlate with optical/IR luminosity and redshift only in a statistical manner. C1 LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. RP SPINRAD, H (reprint author), UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720, USA. NR 27 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 0004-6256 J9 ASTRON J JI Astron. J. PD JUL PY 1993 VL 106 IS 1 BP 6 EP 10 DI 10.1086/116615 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LJ882 UT WOS:A1993LJ88200002 ER PT J AU PALETOU, F VIAL, JC AUER, LH AF PALETOU, F VIAL, JC AUER, LH TI 2-DIMENSIONAL RADIATIVE-TRANSFER WITH PARTIAL FREQUENCY REDISTRIBUTION .2. APPLICATION TO RESONANCE LINES IN QUIESCENT PROMINENCES SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE LINE, FORMATION; RADIATIVE TRANSFER; SUN, PROMINENCES; SUN, FILAMENTS; SUN, UV RADIATION ID LYMAN-ALPHA; SOLAR PROMINENCES; HYDROGEN SPECTRUM; ENERGY-BALANCE; MODELS; CHROMOSPHERE AB Theoretical emergent profiles in the resonance lines of H I Lyman alpha, Mg II h & k and Ca II H & K formed in quiescent prominences are presented. Both partial frequency redistribution effects and two-dimensional structure have been included in the calculations. The prominence model consists of a static, isobaric and isothermal freestanding slab irradiated by realistic chromospheric profiles (OSO-8 observations). We compare the differences between complete (CRD) and partial frequency redistribution (PRD). Vertical variations in the emergent profiles are displayed, and the importance of the geometrical effects is discussed. In addition, we have evaluated both emergent profiles for a filament as seen over the disk, and the back-scattered radiation towards the chromosphere. C1 UNIV PARIS 11, INST ASTROPHYS SPATIALE, F-91405 ORSAY, FRANCE. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 55 TC 22 Z9 22 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 JUL PY 1993 VL 274 IS 2 BP 571 EP 583 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LN548 UT WOS:A1993LN54800024 ER PT J AU MEIXNER, M SKINNER, CJ TEMI, P RANK, D BREGMAN, J BALL, JR KETO, E ARENS, JF JERNIGAN, JG AF MEIXNER, M SKINNER, CJ TEMI, P RANK, D BREGMAN, J BALL, JR KETO, E ARENS, JF JERNIGAN, JG TI 2-12.5 MICRON IMAGING OF IRAS 21282+5050 - THE STRUCTURE OF A YOUNG PLANETARY-NEBULA SO ASTROPHYSICAL JOURNAL LA English DT Article DE INFRARED, INTERSTELLAR, CONTINUUM; PLANETARY NEBULAE, INDIVIDUAL (IRAS 21282 + 5050) ID EMISSION FEATURES; INFRARED-SPECTRA; NGC-7027; IRAS-21282+5050; IDENTIFICATION; SPECTROSCOPY; 10-MU-M; CAMERA; BANDS; STARS AB We present 3.3, 8.5, 10.0, 11.3, and 12.5 mum narrow-band (DELTAlambda/lambda almost-equal-to 3%-10%) and K-band (2.2 mum) high spatial resolution images of IRAS 21282 + 5050 and a 6 cm flux density measurement. The new infrared images reveal a toroidal dust nebula, 4.5'' x 6'', P.A. 165-degrees, with two prominent emission peaks aligned almost E-W and separated by 1''.7-2''.1; a remarkably similar structure to that observed in NGC 7027. From the 6 cm flux density and the dust nebula size, we derive an electron density of 3.6 x 10(3) cm-3 for the central ionized region. Comparison of these images with a published CO 1-0 map suggests that the structure of this dusty, ionization-bounded planetary nebula may reflect the density inhomogeneities of the progenitor's wind. Only slight spatial differences are discernible between the K-band and 10 mum ''dust'' continuum images and the 3.3, 11.3, and 12.5 mum unidentified infrared (UIR) emission-band images which have been attributed to polycyclic aromatic hydrocarbons (PAHs). This tight spatial correlation suggests that the K-band and 10 mum emission also arises from PAHs. C1 UNIV CALIF SANTA CRUZ,UCO,LICK OBSERV,SANTA CRUZ,CA 95060. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. LAWRENCE LIVERMORE NATL LAB,EXPTL ASTROPHYS LAB,LIVERMORE,CA 94550. RP MEIXNER, M (reprint author), UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720, USA. NR 39 TC 24 Z9 24 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 JUL 1 PY 1993 VL 411 IS 1 BP 266 EP 273 DI 10.1086/172826 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LH604 UT WOS:A1993LH60400025 ER PT J AU DAVIES, MB BENZ, W HILLS, JG AF DAVIES, MB BENZ, W HILLS, JG TI ENCOUNTERS BETWEEN BINARIES AND NEUTRON-STARS SO ASTROPHYSICAL JOURNAL LA English DT Article DE BINARIES, GENERAL; CELESTIAL MECHANICS, STELLAR DYNAMICS; HYDRODYNAMICS; METHODS, NUMERICAL; STARS, NEUTRON ID GLOBULAR-CLUSTER CORE; MAIN-SEQUENCE STAR; STELLAR DYNAMICS; CROSS-SECTIONS; EQUAL MASSES; WHITE-DWARF; RED GIANTS; EVOLUTION; SCATTERING; COLLISION AB We simulated encounters between a neutron star and primordial and tidal-capture binaries. Using a three-body code, we simulated 31,000 encounters, then reran a small number of cases with a three-dimensional smoothed particle hydrodynamics (SPH) code to determine the importance of hydrodynamical effects. In the case of encounters involving a tidal-capture binary, comprising of a white dwarf and a main-sequence star, we find that most exchange encounters will produce a single merged object with the white dwarf and neutron star engulfed in a common envelope of gas donated by the main-sequence primary of the original binary. A small fraction of exchanges induce a merger of the white dwarf and main-sequence star, with this object being unbound to the neutron star, and the two objects having a large (approximately 100 km s-1) relative speed at infinity. For encounters involving a primordial binary, fewer encounters require the inclusion of hydrodynamical effects. Those involving collisions or close encounters tend to produce a binary comprised of the two merged stars (now forming one star) and the third star. The binaries produced typically have large enough separations to prevent the formation of a single merged object until subsequent stellar evolution of one of the components causes it to fill its Roche lobe. Clean exchanges produce binaries with large eccentricities; they are typically sufficiently wide to avoid circularization. C1 UNIV ARIZONA,STEWARD OBSERV,TUCSON,AZ 85721. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP DAVIES, MB (reprint author), CALTECH,PASADENA,CA 91125, USA. NR 29 TC 18 Z9 18 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 JUL 1 PY 1993 VL 411 IS 1 BP 285 EP 297 DI 10.1086/172828 PN 1 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LH604 UT WOS:A1993LH60400027 ER PT J AU GUZIK, JA COX, AN AF GUZIK, JA COX, AN TI USING SOLAR P-MODES TO DETERMINE THE CONVECTION ZONE DEPTH AND CONSTRAIN DIFFUSION-PRODUCED COMPOSITION GRADIENTS SO ASTROPHYSICAL JOURNAL LA English DT Article DE CONVECTION; SUN, ABUNDANCES; SUN, INTERIOR; SUN, OSCILLATIONS ID STELLAR ENVELOPES; OPACITY TABLES; EQUATION; STATE; OSCILLATIONS; SUN AB Low- and intermediate-degree (1 = 5-60) solar p-mode frequencies, which are sensitive to the solar structure near the bottom of the convection zone, are used to find the convection zone depth and to constrain the size and shape of composition gradients produced by diffusive settling of helium and heavier elements. We have calculated the evolution and nonadiabatic oscillation frequencies of solar models incorporating the latest Mihalas, Dappen, Hummer, and Mihalas (MHD) equation of state, OPAL opacities, and diffusion of hydrogen, helium, and several heavier elements. Comparisons between observed and calculated p-mode frequencies indicate (1) the solar convection zone base is at 0.712 +/- 0.001 R.; (2) the solar convection zone helium mass fraction Y is very near 0.240 (+/-0.005), or about 0.024 less than the initial abundance required to match the solar luminosity; (3) the diffusion-produced Y and Z composition gradients below the convection zone are fairly steep and not smoothed significantly by turbulence. This implies that turbulent mixing below the convection zone cannot cause most of the solar lithium destruction during the main sequence. C1 LOS ALAMOS NATL LAB,DIV THEORET PHYS,LOS ALAMOS,NM 87545. RP GUZIK, JA (reprint author), LOS ALAMOS NATL LAB,DIV APPL THEORET PHYS,X-2 MS B220,LOS ALAMOS,NM 87545, USA. NR 36 TC 59 Z9 59 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 JUL 1 PY 1993 VL 411 IS 1 BP 394 EP 401 DI 10.1086/172840 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LH604 UT WOS:A1993LH60400039 ER PT J AU HENKE, BL GULLIKSON, EM DAVIS, JC AF HENKE, BL GULLIKSON, EM DAVIS, JC TI X-RAY INTERACTIONS - PHOTOABSORPTION, SCATTERING, TRANSMISSION, AND REFLECTION AT E=50-30,000 EV, Z=1-92 SO ATOMIC DATA AND NUCLEAR DATA TABLES LA English DT Review ID PHOTOIONIZATION CROSS-SECTIONS; 4D GIANT-RESONANCES; ATOMIC FORM-FACTORS; OPTICAL-CONSTANTS; EXTREME ULTRAVIOLET; ENERGY-RANGE; PHOTOELECTRON-SPECTROSCOPY; THIN-FILMS; REGION; ABSORPTION C1 LAWRENCE BERKELEY LAB,CTR XRAY OPT,BERKELEY,CA 94720. NR 288 TC 3196 Z9 3247 U1 28 U2 273 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0092-640X J9 ATOM DATA NUCL DATA JI Atom. Data Nucl. Data Tables PD JUL PY 1993 VL 54 IS 2 BP 181 EP 342 DI 10.1006/adnd.1993.1013 PG 162 WC Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Physics GA LL824 UT WOS:A1993LL82400001 ER PT J AU GAO, DY ASHWORTH, E WATSON, PF KLEINHANS, FW MAZUR, P CRITSER, JK AF GAO, DY ASHWORTH, E WATSON, PF KLEINHANS, FW MAZUR, P CRITSER, JK TI HYPEROSMOTIC TOLERANCE OF HUMAN SPERMATOZOA - SEPARATE EFFECTS OF GLYCEROL, SODIUM-CHLORIDE, AND SUCROSE ON SPERMOLYSIS SO BIOLOGY OF REPRODUCTION LA English DT Article ID FREEZING-INJURY; CRYOPROTECTIVE AGENTS; HUMAN-ERYTHROCYTES; ICE FORMATION; SURVIVAL; CRYOPRESERVATION; PERMEABILITY; DILUTION; MOTILITY; SEMEN AB Hyperosmotic stress, which cells experience during the freezing process, and its release during the warming process are both related to cryoinjury. To define optimal cooling or warming rates and prevent osmotic injury to human sperm, information is required regarding the osmotic tolerance of the cells as a function of 1) time, 2) temperature, 3 ) type of solute, and 4) solute concentration. Human sperm samples were divided into three aliquots. The aliquots were equilibrated at 0, 8, and 22-degrees-C, respectively. Different hyperosmotic solutions were prepared by addition of either a permeating cryoprotective agent (glycerol) or nonpermeating solutes (sucrose, non-ionic; or NaCl, ionic) to isotonic Mann's Ringer solution. Aliquots of the prepared solutions were equilibrated at 0, 8, and 22-degrees-C, respectively. A small volume (2.5 mul) of each sperm aliquot was quickly mixed with 50 mul of each hyperosmotic solution at the corresponding temperature. After times ranging from 5 s to 5 min, 10 mul of each hyperosmotic cell suspension was abruptly returned to an isosmotic environment by mixing with 500 mul of Mann's Ringer solution at the corresponding temperature. The plasma membrane integrity of cells after exposure to hyperosmotic stress and after return to isosmotic conditions was measured by a dual staining (carboxyfluoroscein diacetate and propidium iodide) technique and flow cytometry. The morphology of the treated cells was observed by scanning electron microscopy of freeze-substituted sperm. The results indicate that human spermatozoa exhibited a significant posthypertonic lysis/injury, i.e., loss of membrane integrity, when returned to isosmotic conditions after exposure to hyperosmotic solutions of NaCl or sucrose. The higher die hyperosmolality, the more serious the cell injury. The majority of the cells (> 50% ) lost membrane integrity when die osmolality was a 2000 mOsm. In contrast, if the sperm were not returned to isosmotic conditions, the majority of the sperm in the hyperosmotic solutions appeared to maintain membrane integrity. For a given higher hyperosmolality (> 1000 mOsm), posthypertonic spermolysis was reduced with a decrease of temperature. Cell survival was also affected by time of cell exposure to hyperosmotic environments before cells were returned to the isotonic condition. The shorter the time, the higher the cell survival. When exposed to hyperosmotic glycerol solutions that were isotonic with respect to electrolytes, few cells lost their membrane integrity if the osmolality of glycerol was < 3000 mOsm. For a fixed high osmolality (> 3000 mOsm), the lower the temperature, the higher the percentage spermolysis. At the highest glycerol concentration in this study, i.e., 4694 mOsm, the percentage spermolysis was 17%, 10%, and 2% at 0-degrees-C, 8-degrees-C, and 22-degrees-C, respectively. Spermolysis caused by the removal of glycerol from the cells depended on the means by which the cells were returned to isotonic conditions. A one-step return to isotonic conditions resulted in serious spermolysis, while a multi-step (nine-step) procedure significantly reduced the spermolysis. The scanning electron micrographs showed the distinct morphology of the spermatozoa experiencing the different osmotic conditions. The abnormality of spermatozoa that underwent posthypertonic treatment was demonstrated especially clearly. C1 METHODIST HOSP INDIANA INC,CTR REPROD & TRANSPLANTAT IMMUNOL,1701 N SENATE BLVD,INDIANAPOLIS,IN 46202. INDIANA UNIV,SCH MED,DEPT PHYSIOL & BIOPHYS,INDIANAPOLIS,IN 46202. INDIANA UNIV,DEPT OBSTET & GYNECOL,INDIANAPOLIS,IN 46202. INDIANA UNIV PURDUE UNIV,DEPT PHYS,INDIANAPOLIS,IN 46202. PURDUE UNIV,DEPT HORT,W LAFAYETTE,IN 47907. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. UNIV LONDON ROYAL VET COLL,DEPT VET BASIC SCI,LONDON NW1 0TU,ENGLAND. FU NICHD NIH HHS [HD00980, HD25949] NR 44 TC 111 Z9 112 U1 0 U2 9 PU SOC STUDY REPRODUCTION PI MADISON PA 1603 MONROE ST, MADISON, WI 53711-2021 SN 0006-3363 J9 BIOL REPROD JI Biol. Reprod. PD JUL PY 1993 VL 49 IS 1 BP 112 EP 123 DI 10.1095/biolreprod49.1.112 PG 12 WC Reproductive Biology SC Reproductive Biology GA LK124 UT WOS:A1993LK12400013 PM 8353176 ER PT J AU GUAN, L PETERSEN, JN JOHNSTONE, DL YONGE, DR BROUNS, TM AF GUAN, L PETERSEN, JN JOHNSTONE, DL YONGE, DR BROUNS, TM TI EQUILIBRIUM SORPTION OF CR6+ BY A CONSORTIA OF DENITRIFYING BACTERIA SO BIOTECHNOLOGY LETTERS LA English DT Article AB The accumulation of metal ions on to biological materials is a promising method for removing these toxic materials from waste or ground-waters. A fractional factorial statistical experimental design was used to ascertain which experimental parameters affect the sorption of Cr6+ by a consortium of denitrifying bacteria using a minimum number of experiments. Analysis of this set of experiments found that the steady state sorption behavior could be described by Langmuir isotherms. Observed variations in the isotherm parameters were due to the imposed changes in the experimental variables. In particular, solution pH and the state of the biomass were found to have the greatest influence upon the amount of chromium that was taken up, while other factors had less significance. but were still important. C1 WASHINGTON STATE UNIV, DEPT CHEM ENGN, PULLMAN, WA 99164 USA. WASHINGTON STATE UNIV, DEPT CIVIL & ENVIRONM ENGN, PULLMAN, WA 99164 USA. PACIFIC NW LAB, CTR WASTE TREATMENT TECHNOL, RICHLAND, WA 99352 USA. RI Petersen, James/B-8924-2008 NR 11 TC 9 Z9 9 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0141-5492 EI 1573-6776 J9 BIOTECHNOL LETT JI Biotechnol. Lett. PD JUL PY 1993 VL 15 IS 7 BP 727 EP 732 DI 10.1007/BF01080146 PG 6 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA LQ254 UT WOS:A1993LQ25400012 ER PT J AU GUAN, L PETERSEN, JN JOHNSTONE, DL YONGE, DR BROUNS, TM AF GUAN, L PETERSEN, JN JOHNSTONE, DL YONGE, DR BROUNS, TM TI SORPTION RATES FOR THE UPTAKE OF CR6+ BY A CONSORTIA OF DENITRIFYING BACTERIA SO BIOTECHNOLOGY LETTERS LA English DT Article AB A fractional factorial statistical experimental design was used to ascertain which experimental parameters affect the rate at which Cr6+ is sorbed by a consortium of denitrifying bacteria. Data from this set of experiments indicates that the amount of chromium sorbed as a function of time could be described by an exponential rise function. Additionally, the data indicate that at least 15 hours were required to establish equilibrium. Finally, observed variations in the parameters in this rate equation were found to be due to the imposed changes in the experimental variables. These results indicate that the processes by which the chromate ion was removed from solution may be associated with the cells' metabolic processes. C1 WASHINGTON STATE UNIV, DEPT CHEM ENGN, PULLMAN, WA 99164 USA. WASHINGTON STATE UNIV, DEPT CIVIL & ENVIRONM ENGN, PULLMAN, WA 99164 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RI Petersen, James/B-8924-2008 NR 5 TC 4 Z9 4 U1 0 U2 0 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0141-5492 J9 BIOTECHNOL LETT JI Biotechnol. Lett. PD JUL PY 1993 VL 15 IS 7 BP 733 EP 736 DI 10.1007/BF01080147 PG 4 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA LQ254 UT WOS:A1993LQ25400013 ER PT J AU ZHU, J MA, ZD GUIOCHON, G AF ZHU, J MA, ZD GUIOCHON, G TI THE THICKNESS OF SHOCK LAYERS IN LIQUID-CHROMATOGRAPHY SO BIOTECHNOLOGY PROGRESS LA English DT Article ID ADSORPTION-ISOTHERMS; NONLINEAR CHROMATOGRAPHY; EXCHANGE SYSTEMS; SIMULATION; SORBENTS; MODELS; SILICA AB At high concentrations, one boundary (the front if the isotherm is convex upward) of the elution band of a single component becomes very steep. Similarly, in frontal analysis, the same boundary is self-sharpening. These steep boundaries are called shock layers. They result from the steady-state equilibrium between a nonlinear thermodynamics of phase equilibrium on the one hand, which tends to create a concentration discontinuity, and axial dispersion and a finite rate of mass transfer on the other hand, which tend to relax the concentration gradient. We show that the width of experimental breakthrough curves recorded in frontal analysis agrees well with the prediction of the shock layer theory of Rhee and Amundson in the high concentration range. It is a function of the coefficients of the column HETP equation and the height of the concentration step and is independent of the column length, after the steady state is achieved. In the low concentration range, a discrepancy is observed when the column length is short and the migration distance is insufficient to achieve constant pattern behavior. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 24 TC 15 Z9 15 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 8756-7938 J9 BIOTECHNOL PROGR JI Biotechnol. Prog. PD JUL-AUG PY 1993 VL 9 IS 4 BP 421 EP 428 DI 10.1021/bp00022a009 PG 8 WC Biotechnology & Applied Microbiology; Food Science & Technology SC Biotechnology & Applied Microbiology; Food Science & Technology GA LV092 UT WOS:A1993LV09200010 PM 7763909 ER PT J AU ZYGMUNT, SA CURTISS, LA ITON, LE AF ZYGMUNT, SA CURTISS, LA ITON, LE TI A THEORETICAL-STUDY OF THE OXYGEN-K ABSORPTION-EDGE IN CLUSTER-MODELS OF SODALITE SO CHEMICAL PHYSICS LA English DT Article ID MULTIPLE-SCATTERING; SPECTRA; PHOTOABSORPTION; COPPER; XANES; ATOMS AB The X-ray absorption near-edge spectrum (XANES) has been calculated for the oxygen K-edge in cluster models of pure silica sodalite and a related sodalite containing Al. Results are reported which describe the dependence of the calculated near-edge spectrum on cluster size as well as the presence of Al and the charge-balancing Na cations. Prominent features of the calculated spectra appear to be correlated with the underlying structure of the cluster models. In agreement with other calculations and measurements of near-edge structure in oxides, backscattering of the outgoing photoelectron from 0 atom neighbors is the dominant source of XANES structure, whereas backscattering from Si atoms has a relatively minor effect. Also calculated was the spectrum of a small cluster model of alpha-SiO2, which compared favorably with a previously reported experimental near-edge spectrum. C1 ARGONNE NATL LAB, ARGONNE, IL 60439 USA. RP ZYGMUNT, SA (reprint author), VALPARAISO UNIV, DEPT PHYS & ASTRON, VALPARAISO, IN 46383 USA. NR 26 TC 1 Z9 1 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD JUL 1 PY 1993 VL 173 IS 3 BP 357 EP 366 DI 10.1016/0301-0104(93)80151-X PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LK349 UT WOS:A1993LK34900003 ER PT J AU MALLOY, TA GOLDFARB, TD SURICO, MTJ AF MALLOY, TA GOLDFARB, TD SURICO, MTJ TI PCDDS, PCDFS, PCBS, CHLOROPHENOLS (CPS) AND CHLOROBENZENES (CBZS) IN SAMPLES FROM VARIOUS TYPES OF COMPOSTING FACILITIES IN THE UNITED-STATES SO CHEMOSPHERE LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL SYMP ON CHLORINATED DIOXINS AND RELATED COMPOUNDS ( DIOXINS-92 ) CY AUG 24-28, 1992 CL TAMPERE, FINLAND SP INST OCCUPAT HLTH, UNIV TAMPERE DE COMPOST; YARD WASTE; MUNICIPAL WASTE; SLUDGE; PCDD; PCDF; DIOXIN; PCB ID PENTACHLOROPHENOL; DIBENZOFURANS AB Composting is fast becoming a major tool for managing the solid waste stream in the United States. Samples from three types of composting facilities: yard waste, municipal solid waste (MSW) and MSW plus sewage sludge (MSW/SS) have been analyzed for the presence of PCDDs, PCDFs, PCBs, chlorophenols and chlorobenzenes. The occurrence of PCDDs and PCDFs, with relatively high levels of HpCDDs and OCDD, is attributed to two factors. First, pentachlorophenol (PCP) containing PCDD/F byproducts may enter the compost feedstock contaminating the final product. Second, high levels of PCP and other chlorophenols in MSW and MSW/SS composts may be converted via biological mechanisms to PCDDs and PCDFs, specifically HpCDDs and OCDD. C1 SUNY,DEPT CHEM,STONY BROOK,NY 11794. BROOKHAVEN NATL LAB,DIV SAFETY & ENVIRONM PROTECT,UPTON,NY 11973. NR 13 TC 15 Z9 16 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0045-6535 J9 CHEMOSPHERE JI Chemosphere PD JUL-AUG PY 1993 VL 27 IS 1-3 BP 325 EP 334 DI 10.1016/0045-6535(93)90309-S PG 10 WC Environmental Sciences SC Environmental Sciences & Ecology GA LJ946 UT WOS:A1993LJ94600042 ER PT J AU LAFLAMME, R AF LAFLAMME, R TI TIME-SYMMETRICAL QUANTUM COSMOLOGY AND OUR UNIVERSE SO CLASSICAL AND QUANTUM GRAVITY LA English DT Letter AB We investigate the time neutral formulation of quantum cosmology of Gell-Mann and Hartle. In particular we study the proposal discussed by them that our Universe corresponds to the time-symmetric decoherence functional with initial and final density matrix of low entropy. We show that our Universe does not correspond to this time-symmetric proposal by investigating the behaviour of small inhomogeneous perturbations around a Friedman-Robertson-Walker model. These perturbations cannot be time-symmetric if they were small at the Big Bang. RP LOS ALAMOS NATL LAB, T-6, MSB288, LOS ALAMOS, NM 87545 USA. NR 10 TC 4 Z9 4 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0264-9381 EI 1361-6382 J9 CLASSICAL QUANT GRAV JI Class. Quantum Gravity PD JUL PY 1993 VL 10 IS 7 BP L79 EP L84 DI 10.1088/0264-9381/10/7/001 PG 6 WC Astronomy & Astrophysics; Physics, Multidisciplinary; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LP465 UT WOS:A1993LP46500001 ER PT J AU SANTER, BD WIGLEY, TML JONES, PD AF SANTER, BD WIGLEY, TML JONES, PD TI CORRELATION METHODS IN FINGERPRINT DETECTION STUDIES SO CLIMATE DYNAMICS LA English DT Article ID HEMISPHERE TEMPERATURE TRENDS; OCEAN-ATMOSPHERE MODEL; GREENHOUSE GASES; CLIMATE CHANGES; CO2 AB This investigation addresses two general issues regarding the role of pattern similarity statistics in greenhouse warming detection studies: normalization, and the relative merits of centered versus uncentered statistics. A pattern correlation statistic is used to search for the greenhouse warming signals predicted by five different models in the observed records of land and ocean surface temperature changes. Two forms of this statistic were computed: R(t), which makes use of nonnormalized data, and R(t), which employs point-wise normalized data in order to focus the search on regions where the signal-to-noise ratio is large. While there are no trends in the R(t) time series, the time series of R(t) show large positive trends. However, it is not possible to infer from the R(t) results that the observed pattern of temperature change is, in fact, becoming increasingly similar to the model-predicted signal. This is because point-wise normalization of the observed and simulated mean change fields by a single common field introduces a ''common factor'' effect, which means that the quantities being compared should show some similarity a priori. This does not necessarily make normalization inapplicable, because the detection test involves seeking a trend in the similarity statistic. We show, however, that trends in R(t) must arise almost completely from the observed data, and cannot be an indicator of increasing observed data/signal similarity. We also compare the information provided by centered statistics such as R(t) and the uncentered C(t) statistic introduced by Barnett. We show that C(t) may be expressed as the weighted sum of two terms, one proportional to R(t) and the other proportional to the observed spatial mean. For near-surface temperatures, the spatial average term dominates over the R(t) term. In this case the use of C(t) is equivalent to the use of spatial-mean temperature. We conclude that at present, the most informative pattern correlation statistic for detection purposes is R(t), the standard product-moment correlation coefficient between the observed and model fields. Our failure to find meaningful trends in R (t) may be due to the fact that the signal is being obscured by the background noise of natural variability, and/or because of incorrect model signals or sensitivities. C1 UNIV E ANGLIA,CLIMAT RES UNIT,NORWICH NR4 7TJ,NORFOLK,ENGLAND. RP SANTER, BD (reprint author), LAWRENCE LIVERMORE NATL LAB,PROGRAM CLIMATE MODEL DIAG & INTERCOMPARISON,LIVERMORE,CA 94550, USA. RI Wigley, Tom/B-4705-2008; Jones, Philip/C-8718-2009; Santer, Benjamin/F-9781-2011 OI Jones, Philip/0000-0001-5032-5493; NR 31 TC 55 Z9 57 U1 1 U2 4 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0930-7575 J9 CLIM DYNAM JI Clim. Dyn. PD JUL PY 1993 VL 8 IS 6 BP 265 EP 276 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA LP582 UT WOS:A1993LP58200002 ER PT J AU CANAVAN, GH AF CANAVAN, GH TI STEPS TOWARD GLOBAL AIR DEFENSES SO COMPARATIVE STRATEGY LA English DT Article AB Defenses against aircraft and cruise missiles are a logical adjunct to defenses against ballistic missiles. Developed technologies could support air defenses complementary to limited missile defenses that would be effective against reduced threats. While effective missile defenses should shift emphasis back to aircraft and cruise missiles, technologies in development should be appropriate for projected threats. International development could improve the performance of defenses and lessen the risks and consequences of errors. RP CANAVAN, GH (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 15 TC 0 Z9 0 U1 0 U2 0 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0149-5933 J9 COMP STRATEGY PD JUL-SEP PY 1993 VL 12 IS 3 BP 299 EP 305 DI 10.1080/01495939308402931 PG 7 WC International Relations; Political Science SC International Relations; Government & Law GA LZ960 UT WOS:A1993LZ96000009 ER PT J AU OKAMOTO, Y MARIS, HJ AF OKAMOTO, Y MARIS, HJ TI A NOVEL ALGORITHM FOR CALCULATION OF THE EXTREME EIGENVALUES OF LARGE HERMITIAN MATRICES SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article AB A new fast algorithm for calculating a few maximum (or minimum) eigenvalues and the corresponding eigenvectors of large N X N Hermitian matrices is presented, The method is based on a molecular dynamics algorithm for N coupled harmonic oscillators. The time step for iteration is chosen so that only the normal mode with the maximum eigenvalue grows exponentially. Other eigenvalues and eigenvectors are obtained one by one from the largest eigenvalue by repeating the process in subspaces orthogonal to the previous modes. The characteristics of the algorithm lie in the simplicity, speed (CPU time is-proportional-to N2), and memory efficiency (O(N) besides the matrix). The effectiveness of the algorithm is illustrated by calculation of the groundstate and first-excited state energies of the Heisenberg model for an antiferromagnetic chain with N up to 16384. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. BROWN UNIV,DEPT PHYS,PROVIDENCE,RI 02912. NR 5 TC 11 Z9 11 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0010-4655 J9 COMPUT PHYS COMMUN JI Comput. Phys. Commun. PD JUL PY 1993 VL 76 IS 2 BP 191 EP 202 DI 10.1016/0010-4655(93)90131-U PG 12 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA LM600 UT WOS:A1993LM60000004 ER PT J AU HUGHES, RJ AF HUGHES, RJ TI THE EQUIVALENCE PRINCIPLE SO CONTEMPORARY PHYSICS LA English DT Review ID GRAVITATIONAL RED-SHIFT; 5TH FORCE; REDSHIFT; CONSTRAINTS; POSITRONS; ANTIPROTONS; ANTIMATTER; NEUTRINOS; FIELD; TESTS AB The experimental basis of the equivalence principle is reviewed, and the implications for the gravitational interactions of elementary particles are studied within a special relativistic framework. The gravitational red shift is treated in detail and is used to show that antiparticles also obey the equivalence principle. The profound consequences of a violation of the equivalence principle are discussed. RP HUGHES, RJ (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. NR 101 TC 24 Z9 24 U1 2 U2 5 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0010-7514 J9 CONTEMP PHYS JI Contemp. Phys. PD JUL-AUG PY 1993 VL 34 IS 4 BP 177 EP 191 DI 10.1080/00107519308213817 PG 15 WC Physics, Multidisciplinary SC Physics GA NA025 UT WOS:A1993NA02500001 ER PT J AU BOYD, G KARLSON, SH NEIFER, M ROSS, M AF BOYD, G KARLSON, SH NEIFER, M ROSS, M TI ENERGY INTENSITY IMPROVEMENTS IN STEEL MINIMILLS SO CONTEMPORARY POLICY ISSUES LA English DT Article; Proceedings Paper CT 67TH ANNUAL CONF OF THE WESTERN ECONOMIC ASSOC INTERNATIONAL CY JUL 12, 1992 CL SAN FRANCISCO, CA SP W ECON ASSOC INT ID UNITED-STATES AB Over the past 20 years, U.S. steel manufacturing has experienced an episode of creative destruction. Iron-ore based plants closed, and new electric arc furnace (EAF) plants-the ''minimills''-opened. The steel industry is an ene?gy intensive segment of manufacturing, and the changeover causes major change in energy use. The analysis here links a plant-level database from the Bureau of the Census with publicly available sources and obtains measures of the best practice energy use in minimills. The analysis examines how technical efficiency, vintage, and capacity utilization affect plant-level electricity use per ton of steel. This measure of electricity use gives a plant's ''energy intensity.'' Plants in the sample keep operating even during deep recessions, suggesting that energy, eg., BTU, taxes may fall short of the fullest potential for reducing energy use. During recession, plants actually may continue to operate at lower output rates and higher energy intensities rather than close down. Substantial potential exists for energy improvements of as much as 1 billion kWh per year. New facilities exhibit energy intensity improvement of 6.2 kWh/ton per year. This finding is consistent with engineering estimates. Realizing this potential among all plants would require policies that assist capital turnover. C1 NO ILLINOIS UNIV,DEPT ECON,DE KALB,IL 60115. US BUR CENSUS,CTR ECON STUDIES,WASHINGTON,DC 20233. UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109. RP BOYD, G (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 13 TC 5 Z9 5 U1 2 U2 5 PU WESTERN ECONOMIC ASSOC INT PI HUNTINGTON BEACH PA 7400 CENTER AVE SUITE 109, HUNTINGTON BEACH, CA 92647-3039 SN 0735-0007 J9 CONTEMP POLICY ISSUE PD JUL PY 1993 VL 11 IS 3 BP 88 EP 100 PG 13 WC Economics; Public Administration SC Business & Economics; Public Administration GA LN736 UT WOS:A1993LN73600010 ER PT J AU HAY, BP AF HAY, BP TI METHODS FOR MOLECULAR MECHANICS MODELING OF COORDINATION-COMPOUNDS SO COORDINATION CHEMISTRY REVIEWS LA English DT Review ID EMPIRICAL FORCE-FIELD; STRAIN-ENERGY MINIMIZATION; EXPERIMENTAL ISOMER DISTRIBUTIONS; SIZE-BASED SELECTIVITY; CONFORMATIONAL-ANALYSIS; COBALT(III) COMPLEXES; METAL-COMPLEXES; TETRAAZA MACROCYCLES; RING SIZE; CRYSTAL-STRUCTURE RP HAY, BP (reprint author), PACIFIC NW LAB, CTR EARTH & ENVIRONM SCI, GEOCHEM SECT, RICHLAND, WA 99352 USA. NR 172 TC 178 Z9 178 U1 0 U2 13 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0010-8545 J9 COORDIN CHEM REV JI Coord. Chem. Rev. PD JUL PY 1993 VL 126 IS 1-2 BP 177 EP 236 DI 10.1016/0010-8545(93)85036-4 PG 60 WC Chemistry, Inorganic & Nuclear SC Chemistry GA LP572 UT WOS:A1993LP57200005 ER PT J AU CHA, YS NIEMANN, RC HULL, JR AF CHA, YS NIEMANN, RC HULL, JR TI THERMODYNAMIC ANALYSIS OF HELIUM BOIL-OFF EXPERIMENTS WITH PRESSURE VARIATIONS SO CRYOGENICS LA English DT Article DE CALORIMETRY; HELIUM BOIL-OFF; THERMODYNAMICS AB A thermodynamic analysis by calorimetric experiments in a system with changing pressure is presented. A general equation is derived for use in calculating the rate of heat loss from measured mass flow rate. The results show that the largest contribution from pressure variation is the sensible heat of liquid helium in a Dewar. A dimensionless parameter that was identified provides an indication of the importance of pressure variation relative to the latent heat of vaporization during an experiment. This dimensionless parameter is a function of system pressure (and the thermodynamic properties of helium), rate of change of system pressure, liquid helium inventory in the Dewar and measured mass flow rate. In the special case when the effect of pressure variation is small compared to the latent heat of vaporization, the heat loss rate is the product of the measured mass flow rate and the latent heat of vaporization, multiplied by a correction factor that is a function of the ratio of vapour density to liquid density. This correction factor is significant for helium at pressures near or above 1 atm and should always be included in the calculation. RP CHA, YS (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 5 TC 10 Z9 10 U1 0 U2 1 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 JUL PY 1993 VL 33 IS 7 BP 675 EP 679 DI 10.1016/0011-2275(93)90018-J PG 5 WC Thermodynamics; Physics, Applied SC Thermodynamics; Physics GA LJ775 UT WOS:A1993LJ77500002 ER PT J AU MARSHALL, GW BALOOCH, M TENCH, RJ KINNEY, JH MARSHALL, SJ AF MARSHALL, GW BALOOCH, M TENCH, RJ KINNEY, JH MARSHALL, SJ TI ATOMIC-FORCE MICROSCOPY OF ACID EFFECTS ON DENTIN SO DENTAL MATERIALS LA English DT Article AB Atomic force microscopy (AFM) was used in the examination of the early stages of acid treatment of dentin. Disks of highly polished dentin were initially examined under deionized water and following exposure to 0.025 M nitric acid for 20 s intervals from 0-100 s. Peritubular depth changes were linear (0.005 mu m/s.). The intertubular dentin surface initially moved at approximately 1/2 the peritubular rate and then reached a plateau as the demineralized collagen scaffold collapsed. There was no apparent difference in the tubule center-to-center distance during the treatment. Differences in the movement and morphology of the zones are of importance in dentin bonding applications relying on penetration of the demineralized dentin by adhesive monomers. The changes are probably related to the partial collapse of the collagen matrix. Alternatively, access to the apatite crystals and solubility may be higher in the peritubular zone. AFM appears to hold exceptional promise for the study of conditioning and priming agents for dentin bonding. C1 LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550. RP MARSHALL, GW (reprint author), UNIV CALIF SAN FRANCISCO,DEPT RESTORAT DENT,707 PARNASSUS AVE,BOX 0758,SAN FRANCISCO,CA, USA. RI Rastelli, Marcio/B-8034-2011 FU NIDCR NIH HHS [DE09859] NR 14 TC 82 Z9 83 U1 0 U2 7 PU ACAD DENTAL MATERIALS PI DALLAS PA BAYLOR COLLEGE DENTISTRY, 3302 GASTON AVE, DALLAS, TX 75266-0677 SN 0109-5641 J9 DENT MATER JI Dent. Mater. PD JUL PY 1993 VL 9 IS 4 BP 265 EP 268 DI 10.1016/0109-5641(93)90072-X PG 4 WC Dentistry, Oral Surgery & Medicine; Materials Science, Biomaterials SC Dentistry, Oral Surgery & Medicine; Materials Science GA MQ969 UT WOS:A1993MQ96900009 PM 7988759 ER PT J AU DIXON, PM GARRETT, KA AF DIXON, PM GARRETT, KA TI SAMPLING ECOLOGICAL INFORMATION - CHOICE OF SAMPLE-SIZE, RECONSIDERED SO ECOLOGICAL MODELLING LA English DT Article AB The choice of sample size is a fundamental decision in planning an environmental survey. Dale et al. (Ecol. Modelling, 57: 1-10) developed a model for sampling field plots and concluded that: (1) the sample size should be such that the sample skewness and kurtosis fall within certain ranges, (2) a larger sample size is required from a non-normal distribution than from a normal distribution, and (3) sample means from log-normal distributions are biased. We use statistical sampling theory to show that conclusions (2) and (3) are incorrect and that (1) is unnecessary and inefficient. The sample mean from a simple random sample of any population is an unbiased estimate of the population mean; its precision depends on the sample size and variance, but not the skewness or kurtosis. Non-normal populations do not require larger sample sizes, unless they have a greater variance. Dale et al. ignored sampling variation when they used the results of a small number of samples to make general conclusions about sampling methods. They also confounded the effects of distribution and variance when they generated random numbers with inappropriate variances. RP DIXON, PM (reprint author), UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,DRAWER 2,AIKEN,SC 29802, USA. NR 6 TC 2 Z9 2 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3800 J9 ECOL MODEL JI Ecol. Model. PD JUL PY 1993 VL 68 IS 1-2 BP 67 EP 73 DI 10.1016/0304-3800(93)90108-5 PG 7 WC Ecology SC Environmental Sciences & Ecology GA LN072 UT WOS:A1993LN07200006 ER PT J AU VALLET, CE CHOUDHURY, A SOBOL, PE WHITE, CW AF VALLET, CE CHOUDHURY, A SOBOL, PE WHITE, CW TI XPS CHARACTERIZATION OF ANODIC LAYERS GROWN ON IR-IMPLANTED AND RH-IMPLANTED TITANIUM SO ELECTROCHIMICA ACTA LA English DT Article DE ELECTROCATALYSIS; CHLORINE REACTION; IRIDIUM OXIDE; RHODIUM OXIDES; PHOTOACOUSTIC ID RAY PHOTOELECTRON-SPECTROSCOPY; CHLORINE EVOLUTION; ION-IMPLANTATION; ELECTROCATALYTIC ACTIVITY; ELECTRODES; IRIDIUM; SURFACE; RUO2; RHODIUM; TRANSPORT AB X-ray photoelectron spectroscopy (XPS) is used to characterize oxides anodically formed on near-surface Ir- and Rb-implanted titanium alloys. The oxidation is performed in a (1 M [Cl-], pH = 1.0) solution in which the chlorine evolution reaction is studied subsequently. Good electrocatalytic properties of the Ir/Ti alloy for this reaction appear to be related to the presence of Ir4+ and Ti4+ at the surface. In the case of the Rh/Ti alloy, poor electrocatalytic properties are observed together with Rh in the 0 and 1+ valence states and Ti4+ at the surface. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN. PERKIN ELMER CORP,PHYS ELECTR LAB,EDEN PRAIRIE,MN. RP VALLET, CE (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN, USA. NR 40 TC 10 Z9 10 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-4686 J9 ELECTROCHIM ACTA JI Electrochim. Acta PD JUL PY 1993 VL 38 IS 10 BP 1313 EP 1320 DI 10.1016/0013-4686(93)80064-7 PG 8 WC Electrochemistry SC Electrochemistry GA LJ418 UT WOS:A1993LJ41800001 ER PT J AU CODY, GD DAVIS, A HATCHER, PG AF CODY, GD DAVIS, A HATCHER, PG TI THE DYNAMIC NATURE OF COALS MACROMOLECULAR STRUCTURE - VISCOELASTIC ANALYSIS OF SOLVENT-SWOLLEN COALS SO ENERGY & FUELS LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; MOLECULAR-STRUCTURE AB A simple molecular model of an entangled macromolecular network is used to parametrize the physical behavior of solvent-swollen coals strained under both constant and oscillatory uniaxial compressive stress. The model distinguishes between three dynamic regions covering a wide range of molecular mobility. These are a high-frequency dynamic mode associated with Brownian motion of the segments of the molecular strands, an intermediate-frequency region governed by intramolecular motion associated with contour length fluctuations between entanglement junctions or cross-links, and a low-frequency region governed by the intermolecular mobility of individual macromolecules. The two lower frequency dynamic modes have been characterized through their creep compliance behavior. Viscoelastic strain in response to a constant uniaxial compressive stress is parameterized with a cooperative diffusion coefficient, D(c). Results in the present paper show that D(c) range from 10(-5) to 10(-6) cm2/s. Self-diffusion of individual macromolecules is greatly restricted as evident by the low degree of fluidity of solvent swollen-coals. Coefficients of viscosity, eta, range from 10(11) to 10(13) P. The very large difference between the actual time required to reach steady-state flow and that calculated, assuming linear monodisperse chains, suggests a physical structure composed of entangled, high molecular weight, branched macromolecules with long arms. Energy dissipation in the swollen coals is significant, averaging 50% in the frequency range 10(-3) Hz, and results from a large contribution to the compliance of viscoelastic over elastic strain. The high degree of energy dissipation detected with such a low-frequency stress cycle is consistent with coal's rubbery behavior in the pyridine dilated state. C1 PENN STATE UNIV, DEPT GEOSCI, UNIV PK, PA 16802 USA. ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. NR 28 TC 16 Z9 16 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0887-0624 EI 1520-5029 J9 ENERG FUEL JI Energy Fuels PD JUL-AUG PY 1993 VL 7 IS 4 BP 463 EP 468 DI 10.1021/ef00040a004 PG 6 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA LV478 UT WOS:A1993LV47800004 ER PT J AU CODY, GD BOTTO, RE AF CODY, GD BOTTO, RE TI PROTON NMR IMAGING OF PYRIDINE TRANSPORT IN COAL SO ENERGY & FUELS LA English DT Note ID MACROMOLECULAR STRUCTURE; DIFFUSION; MECHANISMS; METHANOL RP CODY, GD (reprint author), ARGONNE NATL LAB,DIV CHEM,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 22 TC 17 Z9 18 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD JUL-AUG PY 1993 VL 7 IS 4 BP 561 EP 562 DI 10.1021/ef00040a018 PG 2 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA LV478 UT WOS:A1993LV47800018 ER PT J AU REESE, RA ARADHYULA, SV SHOGREN, JF TYSON, KS AF REESE, RA ARADHYULA, SV SHOGREN, JF TYSON, KS TI HERBACEOUS BIOMASS FEEDSTOCK PRODUCTION - THE ECONOMIC-POTENTIAL AND IMPACTS ON UNITED-STATES AGRICULTURE SO ENERGY POLICY LA English DT Article DE BIOMASS INDUSTRY; USA; AGRICULTURE ID RENEWABLE ENERGY TECHNOLOGIES; CINDERELLA OPTIONS; TRANSPORT AB This paper addresses the economic feasibility and impacts on US agriculture of establishing a biomass crop industry capable of producing 8.4 million GJ of methanol or 9.9 million GJ of ethanol by the year 2030 from grasses grown as biomass feedstocks. The results suggest that such an industry could become commercially viable and that the agricultural economy would benefit. Producers of traditional and biomass crops would benefit most. Consumers and livestock producers would lose from higher crop prices, but these losses would be offset by gains to society from reduced government payments to crop producers. C1 YALE UNIV,SCH FORESTRY & ENVIRONM STUDIES,NEW HAVEN,CT 06511. YALE UNIV,CTR AGR & RURAL DEV,NEW HAVEN,CT 06511. UNIV ARIZONA,DEPT AGR ECON,TUCSON,AZ 85721. NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP REESE, RA (reprint author), IOWA STATE UNIV SCI & TECHNOL,CTR AGR & RURAL DEV,DEPT ECON,AMES,IA 50011, USA. RI Shogren, Jason/B-9771-2017 OI Shogren, Jason/0000-0003-3757-959X NR 16 TC 3 Z9 3 U1 0 U2 1 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0301-4215 J9 ENERG POLICY JI Energy Policy PD JUL PY 1993 VL 21 IS 7 BP 726 EP 734 DI 10.1016/0301-4215(93)90143-4 PG 9 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA LN942 UT WOS:A1993LN94200002 ER PT J AU SUTHERLAND, RJ AF SUTHERLAND, RJ TI THE DOES NATURAL-GAS RESEARCH-AND-DEVELOPMENT PORTFOLIO - AN ANALYSIS OF AN INDUSTRY PROPOSAL SO ENERGY POLICY LA English DT Article DE NATURAL GAS; RESEARCH-AND-DEVELOPMENT; PORTFOLIOS AB The natural gas industry has proposed an increase in the US DOE gas R&D budget from about US$100 million to about US$250 million per year for each of the next 10 years. The proposal includes four programmes: natural gas supplies, fuel cells, natural gas vehicles and stationary combustion systems. This paper assesses the gas industry proposal and recommends a natural gas R&D strategy for the DOE. The methodology is a conceptual framework based on an analysis of market failures and the energy policy objectives of the DOE's National Energy Strategy. The gas programmes that would contribute to energy policy goals are identified. RP SUTHERLAND, RJ (reprint author), ARGONNE NATL LAB,370 ENFANT PROMENADE SW,SUITE 702,WASHINGTON,DC 20024, USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0301-4215 J9 ENERG POLICY JI Energy Policy PD JUL PY 1993 VL 21 IS 7 BP 773 EP 787 DI 10.1016/0301-4215(93)90148-9 PG 15 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA LN942 UT WOS:A1993LN94200007 ER PT J AU MICHALSKE, TA SMITH, WL CHEN, EP AF MICHALSKE, TA SMITH, WL CHEN, EP TI STRESS INTENSITY CALIBRATION FOR THE DOUBLE CLEAVAGE DRILLED COMPRESSION SPECIMEN SO ENGINEERING FRACTURE MECHANICS LA English DT Article AB The normalized crack tip stress intensity for the double cleavage drilled compression (DCDC) specimen is characterized as a function of crack length by both experimental and numerical means. The experimental calibration is based on measurements of the critical applied load to produce crack growth in silica glass in an ultra high vacuum environment. Results from the experimental calibration are in good agreement (within 10%) with a finite element analysis of the crack tip stress intensity (K(I)) using the ABAQUS code. The results indicate that K(I) is strongly dependent upon the ratio of the hole size to the sample width used in the DCDC sample geometry even for cracks which are long with respect to the hole diameter. RP MICHALSKE, TA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 8 TC 33 Z9 33 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-7944 J9 ENG FRACT MECH JI Eng. Fract. Mech. PD JUL PY 1993 VL 45 IS 5 BP 637 EP & DI 10.1016/0013-7944(93)90269-X PG 0 WC Mechanics SC Mechanics GA LP894 UT WOS:A1993LP89400008 ER PT J AU BESMANN, TM AF BESMANN, TM TI NUCLEAR-POWER SO ENVIRONMENT LA English DT Editorial Material RP BESMANN, TM (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU HELDREF PUBLICATIONS PI WASHINGTON PA 1319 EIGHTEENTH ST NW, WASHINGTON, DC 20036-1802 SN 0013-9157 J9 ENVIRONMENT JI Environment PD JUL-AUG PY 1993 VL 35 IS 6 BP 2 EP 2 PG 1 WC Environmental Sciences; Environmental Studies SC Environmental Sciences & Ecology GA LM844 UT WOS:A1993LM84400002 ER PT J AU DSURNEY, SJ TSCHAPLINSKI, TJ EDWARDS, NT SHUGART, LR AF DSURNEY, SJ TSCHAPLINSKI, TJ EDWARDS, NT SHUGART, LR TI BIOLOGICAL RESPONSES OF 2 SOYBEAN CULTIVARS EXPOSED TO ENHANCED UVB RADIATION SO ENVIRONMENTAL AND EXPERIMENTAL BOTANY LA English DT Article DE UVB RADIATION; SOYBEAN; DNA DAMAGE; BIOMASS; UV-ABSORBING COMPOUNDS ID STRATOSPHERIC OZONE DEPLETION; ULTRAVIOLET-RADIATION; DNA AB A UVB exposure and monitoring system has been established at the Oak Ridge National Laboratory's Global Climate Change Research Facility. The system consists of a power supply, and data acquisition and exposure equipment to accomplish controlled, elevated exposure of terrestrial plants to UVB. Plant biomass, selected compounds that absorb UV. radiation, and DNA integrity/damage were measured for two soybean cultivars [Glycine max (L.) Merr.] Forrest and Essex exposed to elevated UVB (32%) above ambient) in this system. The biomass of each major plant organ was observed to be less in soybean cultivar Forrest upon exposure to enhanced UVB with the greatest response in seed pods and stems. In contrast, soybean cultivar Essex showed no biomass response to elevated UVB. Enhanced UVB caused significant (P < 0.1) changes in concentrations of UV-absorbing compounds in both soybean cultivars. The Essex cultivar had an increase in UV-absorbing compounds, whereas a decline was observed for soybean Forrest. There was a decrease in the integrity of DNA, as measured by strand breaks, from both cultivars at 30 and 52 days of exposure. DNA pyrimidine dimers in isolated plant DNA were measured with Micrococcus luteus UV endonuclease. DNA from soybean Forrest exposed to UVB and sampled at 30 and 52 days of exposure had significantly greater (P < 0.05) pyrimidine dimer concentration (dimer frequency approximately 1 dimer per 28,000 DNA bases) than either cultivar exposed to UV treatment for 1 day or Essex at days 30-52 (dimer frequencies less-than-or-equal-to 1 per 120,000 bases of DNA). Decrease in DNA integrity and biomass production in Forrest under elevated UVB may be related to the inability to maintain high concentrations of UV-absorbing compounds in leaves. The tolerant cultivar Essex increased the concentration of UV-absorbing compounds while maintaining biomass production and DNA integrity under elevated UVB. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. NR 16 TC 40 Z9 46 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0098-8472 J9 ENVIRON EXP BOT JI Environ. Exp. Bot. PD JUL PY 1993 VL 33 IS 3 BP 347 EP 356 DI 10.1016/0098-8472(93)90036-F PG 10 WC Plant Sciences; Environmental Sciences SC Plant Sciences; Environmental Sciences & Ecology GA LN672 UT WOS:A1993LN67200002 ER PT J AU GRAY, RH BECKER, CD AF GRAY, RH BECKER, CD TI ENVIRONMENTAL CLEANUP - THE CHALLENGE AT THE HANFORD SITE, WASHINGTON, USA SO ENVIRONMENTAL MANAGEMENT LA English DT Article DE ENVIRONMENTAL MONITORING; CLEANUP; RESTORATION; NUCLEAR WASTE ID WILDLIFE AB Numerous challenges face those involved with developing a coordinated and consistent approach to cleaning up the US Department of Energy's (DOE) Hanford Site in southeastern Washington. These challenges are much greater than those encountered when the site was selected and the world's first nuclear complex was developed almost 50 years ago. This article reviews Hanford's history, operations, waste storage/disposal activities, environmental monitoring,and today's approach to characterize and clean up Hanford under a Federal Facility Agreement and Consent Order, signed by DOE, the Environmental Protection Agency, and the Washington Sate Department of Ecology. Although cleanup of defense-related waste at Hanford holds many positive benefits, negative features include high costs to the US taxpayer, numerous uncertainties concerning the technologies to be employed and the risks involved, and the high probability that special interest groups and activists at large will never be completely satisfied. Issues concerning future use of the site, whether to protect and preserve its natural features or open it to public exploitation, remain to be resolved. C1 PACIFIC NW LAB, CTR EARTH & ENVIRONM SCI, RICHLAND, WA 99352 USA. RP GRAY, RH (reprint author), PACIFIC NW LAB, OFF HANFORD ENVIRONM, POB 999, RICHLAND, WA 99352 USA. NR 56 TC 8 Z9 8 U1 2 U2 6 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0364-152X J9 ENVIRON MANAGE JI Environ. Manage. PD JUL-AUG PY 1993 VL 17 IS 4 BP 461 EP 475 DI 10.1007/BF02394662 PG 15 WC Environmental Sciences SC Environmental Sciences & Ecology GA LG071 UT WOS:A1993LG07100005 ER PT J AU GRAY, RH AF GRAY, RH TI MULTIMEDIA ENVIRONMENTAL MONITORING - 50 YEARS AT HANFORD SO ENVIRONMENTAL MONITORING AND ASSESSMENT LA English DT Article; Proceedings Paper CT WORKSHOP ON IMPROVING NATURAL RESOURCE MANAGEMENT THROUGH MONITORING CY MAR 10-11, 1992 CL CORVALLIS, OR SP OREGON STATE UNIV, DEPT FOREST SCI AB Environmental monitoring has been an ongoing activity on the U.S. Department of Energy's Hanford Site in southeastern Washington for almost 50 years. Objectives are to detect and assess potential impacts of Site operations on air, surface and ground waters, foodstuffs, fish, wildlife, soil and vegetation. Data from monitoring effects are used to calculate the overall radiological dose to humans working onsite or residing in nearby communities. In 1989, measured Hanford Site perimeter concentrations of airborne radionuclides were below applicable guidelines. Concentrations of radionuclides and nonradiological water quality in the Columbia River were in compliance with applicable standards. Foodstuffs irrigated with river water taken downstream of the Site showed radionuclide levels that were similar to those found in foodstuffs from control areas. Low levels of Cs-137 and Sr-90 in most onsite wildlife samples and concentrations of radionuclides in soils and vegetation from on- and offsite locations were typical of those attributable to worldwide fallout. The calculated dose potentially received by a maximally exposed individual (i.e., based on hypothetical, worst-case asumptions for all routes of exposure) in 1989 (0.05 mrem/yr) was similar to those calculated for 1985 through 1988. In addition to monitoring radioactivity in fish and wildlife, population numbers of key species are determined. Chinook salmon (Oncorhynchus tshawytscha) spawning in the Columbia River at Hanford has increased in recent years with a concomitant increase in winter roosting activity of bald eagles (Haliaeetus leucocephalus). An elk (Cervus elaphus) herd, established by immigration in 1972, is also increasing. The Hanford Site currently serves as a refuge for Canada goose (Branta canadensis), great blue heron (Ardea herodias), and various plants and other animals, e.g., mule deer (Odocoileus hemionus), and coyotes (Canis latrans). RP GRAY, RH (reprint author), PACIFIC NW LAB, OFF HANFORD ENVIRONM, RICHLAND, WA 99352 USA. NR 0 TC 2 Z9 2 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0167-6369 J9 ENVIRON MONIT ASSESS JI Environ. Monit. Assess. PD JUL PY 1993 VL 26 IS 2-3 BP 263 EP 276 DI 10.1007/BF00547503 PG 14 WC Environmental Sciences SC Environmental Sciences & Ecology GA LV147 UT WOS:A1993LV14700017 PM 24220840 ER PT J AU ATIMTAY, AT GASPERGALVIN, LD POSTON, JA AF ATIMTAY, AT GASPERGALVIN, LD POSTON, JA TI NOVEL SUPPORTED SORBENT FOR HOT GAS DESULFURIZATION SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID H2S AB A sorbent which has been prepared by supporting copper oxide and manganese oxide on a silica-rich zeolite was developed for the removal of hydrogen sulfide from coal gas at high temperatures (around 850-degrees-C). The sorbent is regenerable and more durable for fluidized-bed and moving-bed reactors. The sorbent has been shown through sulfidation and regeneration experiments to be capable of reducing the hydrogen sulfide level in coal gas from 2000 to 200 ppmv for about 60-70 min before breakthrough point. Regeneration of the sorbent with a 50 mol % air-50 mol % steam mixture is preferred over air regeneration, due to decreased sulfate formation in the presence of steam. The metal coating on the zeolite extrudates, especially the Mn, appears to promote increased resistance to crushing. C1 MORGANTOWN ENERGY TECHNOL CTR,MORGANTOWN,WV 26507. NR 13 TC 13 Z9 14 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD JUL PY 1993 VL 27 IS 7 BP 1295 EP 1303 DI 10.1021/es00044a002 PG 9 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA LK437 UT WOS:A1993LK43700010 ER PT J AU VERHOEFF, NPLG SOKOLE, EB HENGST, D STUBBS, JB VANROYEN, EA AF VERHOEFF, NPLG SOKOLE, EB HENGST, D STUBBS, JB VANROYEN, EA TI DOSIMETRY OF I-123 IOMAZENIL IN HUMANS SO EUROPEAN JOURNAL OF NUCLEAR MEDICINE LA English DT Article DE DOSIMETRY; I-123; RECEPTORS; BENZODIAZEPINE; FLUMAZENIL; IOMAZENIL ID BENZODIAZEPINE RECEPTORS; HUMAN-BRAIN; BINDING AB The distribution of the central benzodiazepine receptor specific ligand iodine-123 iomazenil was investigated in seven human adults from whole-body scans, blood samples and urine collected up to 24 h after injection. Using 12 source organs, the MIRD method was applied to calculate the absorbed radiation dose of the radioligand in various organs. The urinary bladder wall (0.15 mGy/MBq), lower large intestinal wall (0.071 mGy/MBq) testes (0.044 mGy/MBq) and upper large intestined wall (0.038 mGy/MBq) received the highest absorbed doses. The average effective dose equivalent of I-123-IBZM for adults was estimated to be 0.033 mSv/MBq. C1 UNIV AMSTERDAM,ACAD MED CTR,DEPT RADIAT SAFETY,1105 AZ AMSTERDAM,NETHERLANDS. OAK RIDGE INST SCI & EDUC,OAK RIDGE,TN. RP VERHOEFF, NPLG (reprint author), UNIV AMSTERDAM,ACAD MED CTR,ACAD ZIEKENHUIS,DEPT NUCL MED F2238,MEIBERGDREEF 9,1105 AZ AMSTERDAM,NETHERLANDS. NR 19 TC 9 Z9 10 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0340-6997 J9 EUR J NUCL MED JI Eur. J. Nucl. Med. PD JUL PY 1993 VL 20 IS 7 BP 580 EP 584 PG 5 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA LN250 UT WOS:A1993LN25000003 PM 8370378 ER PT J AU XENOPOULOS, A WUNDERLICH, B SUBIRANA, JA AF XENOPOULOS, A WUNDERLICH, B SUBIRANA, JA TI THERMAL-PROPERTIES OF NYLONS RELATED TO POLYGLYCINE SO EUROPEAN POLYMER JOURNAL LA English DT Article ID HEAT-CAPACITIES; MORPHOLOGY; POLYAMIDES AB Aliphatic polyamides (homopolyamides 1.n and n.3 and copolyamides 2/n) were characterized in terms of their thermal properties. These series of isomeric polymers have single isolated methylene groups between the amide groups and crystallize in different forms intermediate between pseudohexagonal- and polyglycine II-like. Melting and glass transition temperatures are reported and compared with literature data. Thermogravimetry shows that an isolated methylene group imparts thermal instability to the nylons, depending on the detailed chemical structure. The copolyamides have sharp melting peaks and high crystallinity, when crystallized from solution, but crystallization from the melt is much slower. The heat-flow trends are discussed in relation to estimated heat capacities. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. UNIV POLITECN CATALUNYA,ETSEIB,DEPT ENGN QUIM,E-08028 BARCELONA,SPAIN. RP XENOPOULOS, A (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831, USA. RI Subirana, juan/L-7192-2014 OI Subirana, juan/0000-0002-1706-9341 NR 29 TC 11 Z9 11 U1 3 U2 19 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0014-3057 J9 EUR POLYM J JI Eur. Polym. J. PD JUL PY 1993 VL 29 IS 7 BP 927 EP 935 DI 10.1016/0014-3057(93)90288-Q PG 9 WC Polymer Science SC Polymer Science GA LG519 UT WOS:A1993LG51900007 ER PT J AU KRAEMER, PM BRADBURY, EM AF KRAEMER, PM BRADBURY, EM TI ABROGATION OF A KINASE-MEDIATED G1 CELL-CYCLE ARREST POINT IS A LATE EVENT IN THE NEOPLASTIC PROGRESSION OF HUMAN FIBROBLASTS TRANSFECTED WITH THE SV40 LARGE T-ANTIGEN GENE SO EXPERIMENTAL CELL RESEARCH LA English DT Note ID POTENT INHIBITOR; PROTEIN-KINASE; STAUROSPORINE; CULTURE C1 UNIV CALIF DAVIS,SCH MED,DEPT BIOL CHEM,DAVIS,CA 95616. RP KRAEMER, PM (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545, USA. NR 21 TC 8 Z9 8 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 0014-4827 J9 EXP CELL RES JI Exp. Cell Res. PD JUL PY 1993 VL 207 IS 1 BP 206 EP 210 DI 10.1006/excr.1993.1183 PG 5 WC Oncology; Cell Biology SC Oncology; Cell Biology GA LK309 UT WOS:A1993LK30900028 PM 8391466 ER PT J AU SMITH, RN MEEKS, E AF SMITH, RN MEEKS, E TI EXPERIMENTAL INVESTIGATION OF FREEZING INSIDE A THICK-WALLED CYLINDER SO EXPERIMENTAL THERMAL AND FLUID SCIENCE LA English DT Article DE SOLIDIFICATION; CONJUGATE PROBLEMS AB A series of experiments were performed to investigate the effects of a thick wall on the freezing process occurring inside a cylindrical container. Two cylinders with different thermal diffusivity (k/rhoc) values were compared. To isolate the effects of the wall sensible energy, experiments were run for both a subcooled wall and the wall initially at the phase change material (PCM) fusion temperature. The PCM was initially at its fusion temperature for all cases. The base of the cylinder was maintained at a constant temperature in all but one case, where the lower boundary was approximately adiabatic. At several time steps, the mass fraction solidified and the phase front profile were determined. Measurements of the base heat flux and mean cylinder temperature were also obtained as functions of time. The fraction frozen vs time curves and the shape of the phase front profiles are compared for each set of conditions. The energy content of the wall can significantly affect both results. The data are presented in such a way as to encourage comparison with numerical computations of a similar complex-boundary freezing problem. C1 SANDIA NATL LABS,LIVERMORE,CA 94550. RP SMITH, RN (reprint author), RENSSELAER POLYTECH INST,DEPT MECH ENGN AERONAUT ENGN & MECH,TROY,NY 12181, USA. NR 8 TC 7 Z9 7 U1 0 U2 3 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0894-1777 J9 EXP THERM FLUID SCI JI Exp. Therm. Fluid Sci. PD JUL PY 1993 VL 7 IS 1 BP 22 EP 29 DI 10.1016/0894-1777(93)90077-V PG 8 WC Thermodynamics; Engineering, Mechanical; Physics, Fluids & Plasmas SC Thermodynamics; Engineering; Physics GA LJ750 UT WOS:A1993LJ75000003 ER PT J AU ROBERTO, FF BRUHN, DF WILHITE, AM WARD, TE AF ROBERTO, FF BRUHN, DF WILHITE, AM WARD, TE TI PHYLOGENETIC AND BIOCHEMICAL-CHARACTERIZATION OF ACIDOPHILIC BACTERIA SO FEMS MICROBIOLOGY REVIEWS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON ADVANCES ON BIOHYDROMETALLURGY - MICROBIOLOGY AND APPLICATIONS CY SEP 09-13, 1992 CL TROIA, PORTUGAL SP COMMISS EUROPEAN COMMUNITIES, RAW MAT & RECYCLING PROGRAMME, NATO, SCI STABIL PROGRAMME, CALOUSTE GULBENKIAN FDN, PORTUGESE SECRETARY STATE ENERGY & ENVIRONM, JNICT DE POLYMERASE CHAIN REACTION; RIBOSOMAL RNA; FATTY ACIDS ID RIBOSOMAL-RNA SEQUENCES; THIOBACILLUS-FERROOXIDANS; SP-NOV; DNA; AMPLIFICATION AB In the course of our studies to determine appropriate conditions to transform Thiobacillus ferrooxidans, we have adopted a tetrathionate-containing medium. A number of different, apparently stable colony morphologies have arisen from cultures presumed to be pure while grown on iron-containing medium. In an effort to assess whether these different morphologies are indicative of previously undetected contamination, or simply manifestations of physiological variability within a strain, we have applied a number of biochemical and genetic techniques, including cellular fatty acid analysis and 16S rRNA sequence determination. These data should allow us to unequivocally characterize and compare the organisms present in our cultures. RP ROBERTO, FF (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 15 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-6445 J9 FEMS MICROBIOL REV JI Fems Microbiol. Rev. PD JUL PY 1993 VL 11 IS 1-3 BP 31 EP 36 PG 6 WC Microbiology SC Microbiology GA LP095 UT WOS:A1993LP09500005 ER PT J AU CADA, GF SALE, MJ AF CADA, GF SALE, MJ TI STATUS OF FISH PASSAGE FACILITIES AT NONFEDERAL HYDROPOWER PROJECTS SO FISHERIES LA English DT Article AB The status of direct mitigation practices for fish passage was assessed as part of an ongoing, multi-year study of the costs and benefits of environmental mitigation measures at nonfederal hydroelectric power plants. Information was obtained from the Federal Energy Regulatory Commission, hydropower developers and state and federal resource agencies involved in hydropower regulation. Fish ladders were found to be the most common means of passing fish upstream; elevators/lifts were less common, but their use appears to be increasing. A wide variety of mitigative measures, including spill flows, narrow-mesh intake screens, angled bar racks and light- or sound-based guidance measures, is employed to prevent fish from being drawn into turbine intakes. Performance monitoring and detailed, quantifiable performance criteria were frequently lacking. Fifty-two of the 66 projects (82%) with operating downstream fish passage measures had no performance monitoring requirements; 50 of 71 project operators (70%) indicated that no performance objectives had been specified for the mitigative measures. We found that comprehensive field studies needed to evaluate the effectiveness of fish passage devices have been rare. RP CADA, GF (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. NR 0 TC 19 Z9 20 U1 2 U2 11 PU AMER FISHERIES SOC PI BETHESDA PA 5410 GROSVENOR LANE SUITE 110, BETHESDA, MD 20814-2199 SN 0363-2415 J9 FISHERIES JI Fisheries PD JUL PY 1993 VL 18 IS 7 BP 4 EP 12 DI 10.1577/1548-8446(1993)018<0004:SOFPFA>2.0.CO;2 PG 9 WC Fisheries SC Fisheries GA LM162 UT WOS:A1993LM16200002 ER PT J AU KESKA, JK AF KESKA, JK TI EXPERIMENTAL INVESTIGATION OF SPATIAL CONCENTRATION SPECTRA OF A SOLID IN A SLURRY IN HORIZONTAL PIPELINE FLOW SO FLOW MEASUREMENT AND INSTRUMENTATION LA English DT Article DE 2-PHASE FLOW; CONCENTRATION MEASUREMENTS; SLURRY FLOW; STATISTICAL ANALYSIS; EXPERIMENTAL DATA; TURBULENCE; CONCENTRATION FLUCTUATION; CONCENTRATION METER; FLOW PATTERN DISCRIMINATION AB Slurry flow problems confront a broad range of industries, including those involved in power generation, mining, petroleum and gas production, chemical and petrochemical manufacture, metals manufacture, environmental issues, hydrology and fossil energy conversion. The present understanding of two-phase liquid-solid mixtures, and even their simplest fully developed flows in pipes and channels, is not completely satisfactory. Progress in understanding the results of laboratory experiments must take into account the complicated flow pattern phenomena that exist and which are directly associated with spatial and temporal distribution of the component concentration. Any two-phase measurement techniques and instrumentation developments are particularly important, and in this aspect, especially, development of the concentration measurements in liquid-solid two-phase flows is essential in order to develop experimental research. Such a measurement system is related to a description of mixture turbulence and flow pattern, and may be a significant step towards the building of a tool for the quantitative study of the phenomena. This paper presents the experimental data for sand-water flow in a pipe. The goal is to measure in situ concentration with a developed capacitive system; that is, a system of measuring capacitors placed tangential to the mixture flow and on the surface of the channel walls in a non-obstructive manner. The experiments were conducted using the capacitive technique for measurements of spatial concentration, its time fluctuations and its space distribution. The measurement system was developed, built, calibrated, and used successfully in this investigation. Using this system, responding to changes of capacitance with spatial concentration of slurry, time spectra of spatial concentration fluctuations in turbulent slurry flows in horizontal pipe have been measured. This paper demonstrates the applicability of the technique for spatial concentration distribution in time and space measurements as well as the reverse model for correlation between the spatial concentration and its distribution. A fast response, linearized capacitive concentration measurement system has been used to obtain statistical measurements in naturally fluctuating sand-water flow in a horizontal pipe. It is demonstrated that the concentration fluctuation frequency may be used as an objective and quantitative flow pattern discriminator for two-phase flow. RP KESKA, JK (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 0 TC 5 Z9 5 U1 1 U2 1 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0955-5986 J9 FLOW MEAS INSTRUM JI Flow Meas. Instrum. PD JUL PY 1993 VL 4 IS 3 BP 155 EP 162 DI 10.1016/0955-5986(93)90051-J PG 8 WC Engineering, Mechanical; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA LX191 UT WOS:A1993LX19100004 ER PT J AU MICHAUD, EJ BULTMAN, SJ STUBBS, LJ WOYCHIK, RP AF MICHAUD, EJ BULTMAN, SJ STUBBS, LJ WOYCHIK, RP TI THE EMBRYONIC LETHALITY OF HOMOZYGOUS LETHAL YELLOW MICE (A(Y)/A(Y)) IS ASSOCIATED WITH THE DISRUPTION OF A NOVEL RNA-BINDING PROTEIN SO GENES & DEVELOPMENT LA English DT Article DE AGOUTI; LETHAL YELLOW; EMBRYONIC DEVELOPMENT; RALY; HNRNP-C; RNA-BINDING PROTEINS ID NUCLEAR RIBONUCLEOPROTEIN-PARTICLES; MESSENGER-RNA; SEQUENCE-ANALYSIS; AGOUTI LOCUS; C-PROTEINS; GENE; DROSOPHILA; AY; EXPRESSION AB Lethal yellow (A(y)) is a mutation at the mouse agouti (a) locus that is associated with an all-yellow coat color, obesity, diabetes, tumors in heterozygotes, and preimplantation embryonic lethality in homozygotes. Previously, we cloned and characterized the wild-type agouti gene and demonstrated that it expresses a 0.8-kb mRNA in neonatal skin. In contrast, A(y) expresses a 1.1-kb transcript that is ectopically overexpressed in all tissues examined. The A(y) mRNA is identical to the wild-type a transcript for the entire coding region, but the 5'-untranslated sequence of the a gene has been replaced by novel sequence. Here, we demonstrate that the novel 5' sequence in the A(y) mRNA corresponds to the 5'-untranslated sequence of another gene that is normally tightly linked to a in mouse chromosome 2. This other gene (Raly) has the potential to encode a novel RNA-binding protein that is normally expressed in the preimplantation embryo, throughout development, and in all adult tissues examined. Importantly, the A(y) mutation disrupts the structure and expression of the Raly gene. The data suggest that the A(y) mutation arose from a DNA structural alteration that affects the expression of both agouti and Raly. We propose that the dominant pleiotropic effects associated with A(y) may result from the ectopic overexpression of the wild-type a gene product under the control of the Raly promoter and that the recessive embryonic lethality may be the result of the lack of Raly gene expression in the early embryo. C1 UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE,TN 37831. RP MICHAUD, EJ (reprint author), OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831, USA. FU NIEHS NIH HHS [IAG 222Y01-ES-10067] NR 57 TC 131 Z9 135 U1 0 U2 5 PU COLD SPRING HARBOR LAB PRESS PI PLAINVIEW PA 1 BUNGTOWN RD, PLAINVIEW, NY 11724 SN 0890-9369 J9 GENE DEV JI Genes Dev. PD JUL PY 1993 VL 7 IS 7A BP 1203 EP 1213 DI 10.1101/gad.7.7a.1203 PG 11 WC Cell Biology; Developmental Biology; Genetics & Heredity SC Cell Biology; Developmental Biology; Genetics & Heredity GA LL403 UT WOS:A1993LL40300008 PM 8319910 ER PT J AU WARD, JRT COTTRELL, S THOMAS, HJW JONES, TA HOWE, CM HAMPTON, GM DEAVEN, L SHEER, D BODMER, WF SOLOMON, E FRISCHAUF, AM AF WARD, JRT COTTRELL, S THOMAS, HJW JONES, TA HOWE, CM HAMPTON, GM DEAVEN, L SHEER, D BODMER, WF SOLOMON, E FRISCHAUF, AM TI A LONG-RANGE RESTRICTION MAP OF HUMAN CHROMOSOME-5Q21-Q23 SO GENOMICS LA English DT Article ID FAMILIAL ADENOMATOUS POLYPOSIS; ADENOCARCINOMA CELL-LINES; TYROSINE KINASE GENE; HUMAN GENOME; DNA MARKERS; APC GENE; CARCINOMA; COLI; REGION; CANCER C1 IMPERIAL CANC RES FUND,MOLEC ANAL MAMMALIAN,MUTAT LAB,POB 123,LINCOLNS INN FIELDS,LONDON WC2A 3PX,ENGLAND. IMPERIAL CANC RES FUND,CANC GENET LAB,LONDON WC2A 3PX,ENGLAND. IMPERIAL CANC RES FUND,SOMAT CELL GENET LAB,LONDON WC2A 3PX,ENGLAND. IMPERIAL CANC RES FUND,HUMAN CYTOGENET LAB,LONDON WC2A 3PX,ENGLAND. LOS ALAMOS NATL LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87545. RI Sheer, Denise/C-6705-2011; Jones, Tania/C-8912-2011; Corbett-Jones, Tania/E-4891-2013; OI Sheer, Denise/0000-0001-9067-1796; Jones, Tania/0000-0002-0067-3382; Corbett-Jones, Tania/0000-0002-0067-3382; Bodmer, Walter/0000-0001-6244-9792 FU Cancer Research UK [A3585] NR 65 TC 8 Z9 8 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 JUL PY 1993 VL 17 IS 1 BP 15 EP 24 DI 10.1006/geno.1993.1277 PG 10 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA LN156 UT WOS:A1993LN15600003 PM 8104865 ER PT J AU RIETHMAN, HC SPAIS, C BUCKINGHAM, J GRADY, D MOYZIS, RK AF RIETHMAN, HC SPAIS, C BUCKINGHAM, J GRADY, D MOYZIS, RK TI PHYSICAL ANALYSIS OF THE TERMINAL-240 KB OF DNA FROM HUMAN CHROMOSOME-7Q SO GENOMICS LA English DT Article ID GENETIC-LINKAGE MAP; HUMAN GENOME; HUMAN TELOMERES; LONG ARM; YEAST; SEQUENCES; CLONING; VECTORS; POLYMORPHISM; (TTAGGG)N C1 LOS ALAMOS NATL LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87544. RP RIETHMAN, HC (reprint author), WISTAR INST ANAT & BIOL,3601 SPRUCE ST,PHILADELPHIA,PA 19104, USA. FU NHGRI NIH HHS [HG00567]; NIGMS NIH HHS [5-F32 GM 12884] NR 44 TC 23 Z9 23 U1 1 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD JUL PY 1993 VL 17 IS 1 BP 25 EP 32 DI 10.1006/geno.1993.1278 PG 8 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA LN156 UT WOS:A1993LN15600004 PM 8406463 ER PT J AU GINGRICH, JC SHADRAVAN, F LOWRY, SR AF GINGRICH, JC SHADRAVAN, F LOWRY, SR TI A FLUORESCENCE IN-SITU HYBRIDIZATION MAP OF HUMAN CHROMOSOME-21 CONSISTING OF 30 GENETIC AND PHYSICAL MARKERS ON THE CHROMOSOME - LOCALIZATION OF 137 ADDITIONAL YAC AND COSMID CLONES WITH RESPECT TO THIS MAP SO GENOMICS LA English DT Article ID YEAST ARTIFICIAL CHROMOSOMES; RESOLUTION CYTOGENETIC MAP; HUMAN GENOME; LONG ARM; HUMAN XQ24-XQ28; DNA-SEQUENCES; LIBRARY; CONSTRUCTION; INTERPHASE; EQUIVALENTS RP GINGRICH, JC (reprint author), LAWRENCE BERKELEY LAB,CTR HUMAN GENOME,BLDG 74,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 42 TC 9 Z9 9 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD JUL PY 1993 VL 17 IS 1 BP 98 EP 105 DI 10.1006/geno.1993.1289 PG 8 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA LN156 UT WOS:A1993LN15600015 PM 8406476 ER PT J AU ROSE, TM LAGROU, MJ FRANSSON, I WERELIUS, B DELATTRE, O THOMAS, G DEJONG, PJ TODARO, GJ DUMANSKI, JP AF ROSE, TM LAGROU, MJ FRANSSON, I WERELIUS, B DELATTRE, O THOMAS, G DEJONG, PJ TODARO, GJ DUMANSKI, JP TI THE GENES FOR ONCOSTATIN-M (OSM) AND LEUKEMIA INHIBITORY FACTOR (LIF) ARE TIGHTLY LINKED ON HUMAN CHROMOSOME-22 SO GENOMICS LA English DT Article ID DIFFERENTIATION-STIMULATING FACTOR; GROWTH-HORMONE; HUMAN INTERLEUKIN; FACTOR RECEPTOR; CELLS; SARCOMA; CLONING; LOCUS; IDENTIFICATION; TRANSLOCATION C1 KAROLINSKA INST,KAROLINSKA HOSP,S-10401 STOCKHOLM 60,SWEDEN. INST CURIE,F-75231 PARIS 05,FRANCE. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP ROSE, TM (reprint author), FRED HUTCHINSON CANC RES CTR,1124 COLUMBIA ST,EP-310-N,SEATTLE,WA 98104, USA. NR 35 TC 33 Z9 35 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 JUL PY 1993 VL 17 IS 1 BP 136 EP 140 DI 10.1006/geno.1993.1294 PG 5 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA LN156 UT WOS:A1993LN15600020 PM 8406444 ER PT J AU PALMER, DA WESOLOWSKI, DJ AF PALMER, DA WESOLOWSKI, DJ TI ALUMINUM SPECIATION AND EQUILIBRIA IN AQUEOUS-SOLUTION .3. POTENTIOMETRIC DETERMINATION OF THE 1ST HYDROLYSIS CONSTANT OF ALUMINUM(III) IN SODIUM-CHLORIDE SOLUTIONS TO 125-DEGREES-C SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID THERMODYNAMIC PROPERTIES; ACIDITY MEASUREMENTS; WATER; ELECTROLYTES; TEMPERATURES; IONIZATION; SOLUBILITY; GIBBSITE; MEDIA; MAGNESIUM AB The first molal hydrolysis quotient of aluminum(III) was measured potentiometrically from 25 to 125-degrees-C at 25-degrees intervals at ionic strengths of 0.1, 0.3, 1.0, and 5 mol - kg-1 with sodium chloride as the supporting electrolyte. The experimental method involved using a hydrogen-electrode concentration cell modified to compensate for any intrinsic potential offset between the two electrodes. The initial concentration of Al3+ was varied to test for the presence of multinuclear aluminum species while being kept to a maximum of 10(-3) mol . kg-1 to minimize their occurrence. Similarly, the maximum degree of hydrolysis of Al3+ reached in each titration was ca. 30%, after which polymerization and/or precipitation became apparent. The equilibrium quotients obtained in this study and selected values from the literature were fitted by an empirical equation incorporating a linear dependence of log K1,1 on the reciprocal temperature (Kelvins) over the range 10-200-degrees-C and three ionic-strength-dependent parameters. Comparisons are made between the results of this study and the literature values. RP PALMER, DA (reprint author), OAK RIDGE NATL LAB,DIV CHEM,BLDG 4500S,POB 2008,OAK RIDGE,TN 37831, USA. NR 42 TC 79 Z9 79 U1 3 U2 12 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 JUL PY 1993 VL 57 IS 13 BP 2929 EP 2938 DI 10.1016/0016-7037(93)90284-4 PG 10 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA LM788 UT WOS:A1993LM78800001 ER PT J AU VAIRAVAMURTHY, A AF VAIRAVAMURTHY, A TI OXIDATION-STATE OF SULFUR IN THIOSULFATE AND IMPLICATIONS FOR ANAEROBIC ENERGY-METABOLISM (VOL 57, PG 1619, 1993) SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Correction, Addition RP VAIRAVAMURTHY, A (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,GEOSCI PROGRAM,UPTON,NY 11973, USA. NR 1 TC 0 Z9 0 U1 0 U2 4 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 JUL PY 1993 VL 57 IS 13 BP 3199 EP 3199 DI 10.1016/0016-7037(93)90304-F PG 1 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA LM788 UT WOS:A1993LM78800021 ER PT J AU HARVEY, TF SHAPIRO, CS WITTLER, RF AF HARVEY, TF SHAPIRO, CS WITTLER, RF TI FALLOUT RISK AFTER A MAJOR NUCLEAR ATTACK ON THE USA SO GEOKHIMIYA LA Russian DT Article AB Fallout distributions are calculated for nuclear attacks on the contiguous United States. Four attack scenarios are treated, including counterforce and counterforce-countervalue attacks, for meteorological conditions associated with a typical day in summer and one in winter. The countervalue attacks contain mostly airbursts. To determine fallout effects, the population surviving the prompt effects is first calculated. For the prompt effects, a ''conflagration'' type model is used. The counterforce attack produces about 8 million prompt deaths, and the counterforce-countervalue case projects 98 million prompt deaths. Partial relocation before attack to low-risk fallout areas at least 15 km from potential strategic targets would result in a decrease in projections of deaths by tens of millions. For fallout risk calculations, only the dose received in the first 48 hours (the early, of local fallout) is considered. Populations are assumed to be sheltered, with a shelter protection factor profile that varies for a large urban area, a small urban area, or a rural area. With these profiles, without relocation, the fallout fatalities for all four attack scenarios are calculated to be less than one million people. This can be compared to fallout fatalitites of about 10 million for a hypothetical unsheltered ''phantom'' population. RP HARVEY, TF (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 15 TC 0 Z9 0 U1 0 U2 0 PU ROSSIISKAYA AKADEMIYA NAUK PI MOSCOW PA SAVELEVSKII PER., 13 OCTOZHENKA, 119034 MOSCOW, RUSSIA SN 0016-7525 J9 GEOKHIMIYA+ JI Geokhimiya PD JUL PY 1993 IS 7 BP 1044 EP 1062 PG 19 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA LT646 UT WOS:A1993LT64600016 ER PT J AU PERRY, FV DEPAOLO, DJ BALDRIDGE, WS AF PERRY, FV DEPAOLO, DJ BALDRIDGE, WS TI NEODYMIUM ISOTOPIC EVIDENCE FOR DECREASING CRUSTAL CONTRIBUTIONS TO CENOZOIC IGNIMBRITES OF THE WESTERN UNITED-STATES - IMPLICATIONS FOR THE THERMAL EVOLUTION OF THE CORDILLERAN CRUST SO GEOLOGICAL SOCIETY OF AMERICA BULLETIN LA English DT Article ID RIO-GRANDE RIFT; PLATEAU VOLCANIC FIELD; MAFIC MAGMA CHAMBERS; GRIZZLY PEAK TUFF; NEW-MEXICO; TECTONIC EVOLUTION; CHEMICAL EVIDENCE; TERTIARY GRANITE; ND; SR AB Numerous studies of large-volume rhyolite systems from the western United States conclude that rhyolite is primarily generated by extensive fractional crystallization of basalt accompanied by assimilation of crustal wallrock. Relative crustal contributions to large-volume rhyolite can be estimated by comparing the Nd isotopic composition of the rhyolite with the Nd isotopic characteristics of crust and mantle reservoirs associated with different continental basement age provinces. We have estimated the crustal contributions to 12 early Oligocene to Pleistocene rhyolite systems located throughout the Cordillera. We have determined that (1) crustal contributions to large-volume rhyolite systems decrease from the Oligocene to the Miocene, and (2) rhyolite systems younger than 20 Ma are dominated by mantle components. The crustal contributions to rhyolite systems may be controlled by system size and duration, crustal thickness, tectonic setting, crustal composition, crustal density, and crustal temperature. We conclude that regional cooling of the lower crust, which progressively limited the amount of crustal wallrock assimilated by rhyolite systems, is the only parameter that is consistent with geologic and geochemical data for rhyolite systems and the geologic evolution of the Cordillera. A quantitative model that relates the amount of crustal contribution to assimilation/recharge rates and the temperature of the crust indicates that lower-crustal temperatures would have to decrease about 300-degrees-C between early Oligocene and early Miocene time to account for the decrease in crustal contributions. C1 UNIV CALIF BERKELEY, DEPT GEOL & GEOPHYS, CTR ISOTOPE GEOCHEM, BERKELEY, CA 94720 USA. LOS ALAMOS NATL LAB, DIV EARTH & ENVIRONM SCI, LOS ALAMOS, NM 87545 USA. RP PERRY, FV (reprint author), UNIV NEW MEXICO, DEPT EARTH & PLANETARY SCI, ALBUQUERQUE, NM 87131 USA. NR 57 TC 52 Z9 53 U1 0 U2 0 PU GEOLOGICAL SOC AMER, INC PI BOULDER PA PO BOX 9140, BOULDER, CO 80301-9140 USA SN 0016-7606 EI 1943-2674 J9 GEOL SOC AM BULL JI Geol. Soc. Am. Bull. PD JUL PY 1993 VL 105 IS 7 BP 872 EP 882 DI 10.1130/0016-7606(1993)105<0872:NIEFDC>2.3.CO;2 PG 11 WC Geosciences, Multidisciplinary SC Geology GA LM160 UT WOS:A1993LM16000002 ER PT J AU HIRSCH, LM SHANKLAND, TJ AF HIRSCH, LM SHANKLAND, TJ TI QUANTITATIVE OLIVINE-DEFECT CHEMICAL-MODEL - INSIGHTS ON ELECTRICAL-CONDUCTION, DIFFUSION, AND THE ROLE OF FE CONTENT SO GEOPHYSICAL JOURNAL INTERNATIONAL LA English DT Article DE DEFECTS; DIFFUSIVITY; ELECTRICAL CONDUCTIVITY; MANTLE PROPERTIES; OLIVINE ID SAN-CARLOS OLIVINE; HIGH-TEMPERATURE CREEP; OXYGEN PARTIAL-PRESSURE; POINT-DEFECTS; INTERSITE DISTRIBUTION; SITE OCCUPANCIES; STABILITY FIELD; FORSTERITE; MG; NONSTOICHIOMETRY AB By simultaneously solving the governing equations for defect formation and the relevant conservation laws, a general calculation of equilibrium concentrations of point defects in olivine as functions of temperature, oxygen fugacity (fO2), and Fe content is made. We present calculations both for olivine buffered by either pyroxene or magnesiowustite and for unbuffered olivine having fixed (Fe + Mg)/Si of 2 and Fe/(Fe + Mg) up to 0.1. The aim of this work is to better understand the mechanisms that control the transport processes of electrical conduction and diffusion. The following controlling mechanisms are consistent with calculated defect populations and experimental transport property data. Electrical conduction is dominated at low fO2 by electrons and at high fO2 by polaron hopping involving Fe3+ on Mg sites (Fe(Mg).) and Mg vacancies. Mg diffuses by a vacancy mechanism whereas O and Si more likely diffuse via interstitial mechanisms. We define the intrinsic-extrinsic division as the concentration of Fe at which the concentrations of other defects are perturbed; this division depends strongly on fO2 and temperature. Thus, even minute amounts of Fe (i.e. Fe/(Fe + Mg) = 1 ppm) may affect material properties at temperatures below 1000 K and fO2 above 10(-17) MPa, whereas at temperatures above 2000 K and fO2 below 10(-9) MPa, material properties may be unaffected up to Fe/(Fe + Mg) = 0.01. Although the energy parameters in the current model are probably not unique, calculated defect populations over wide ranges of temperature, fO2, buffer condition, and Fe content agree well with available experimental data. C1 LOS ALAMOS NATL LAB,GEOPHYS GRP,LOS ALAMOS,NM 87545. NR 72 TC 37 Z9 39 U1 1 U2 15 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0956-540X J9 GEOPHYS J INT JI Geophys. J. Int. PD JUL PY 1993 VL 114 IS 1 BP 21 EP 35 DI 10.1111/j.1365-246X.1993.tb01463.x PG 15 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA LM794 UT WOS:A1993LM79400003 ER PT J AU HIRSCH, LM SHANKLAND, TJ DUBA, AG AF HIRSCH, LM SHANKLAND, TJ DUBA, AG TI ELECTRICAL-CONDUCTION AND POLARON MOBILITY IN FE-BEARING OLIVINE SO GEOPHYSICAL JOURNAL INTERNATIONAL LA English DT Article DE ELECTRICAL CONDUCTIVITY; MANTLE PROPERTIES; OLIVINE ID CATION DISTRIBUTIONS; HIGH-TEMPERATURE; SYNTHETIC OLIVINES; DEPENDENCE; PRESSURE; MINERALS AB Electrical conductivity sigma of Mg2(1-Y)Fe2YSiO4 olivines was measured as a function of Fe content (Y = 0.09, 0.11, 0.18, 0.34) at temperatures between 1423-1573 K and at oxygen fugacities slightly below the wustite-magnetite buffer. Conductivity was proportional to X(Fe)1.8 for the conditions examined. In accord with current and previous experiments and defect models at these conditions, conductivity is dominated by small polaron hopping of holes from Fe3+ to Fe2+ on the Mg sublattice. From quantitative equilibrium defect chemistry calculations, we find that the Fe3+ concentration is proportional to X(Fe)0.73. From measured conductivity and calculated defect concentrations, the hopping mobility is proportional to X(Fe)1.1 and is in the range (1-6) x 10(-4) cm2 V-1 s-1. This 1.1 power dependence on Fe content for mobility is close to the value of approximately 1.0 independently deduced from polaron hopping theory for mixed valence solid solution systems. Therefore, small polaron conduction self-consistently explains the observed 1.8 power dependence of sigma on Fe content. Using the measured dependence of conductivity on Fe content, a change in composition from Fa10 to Fa12 produces a conductivity increase by a factor of 1.39; near 1473 K such a conductivity change could be misinterpreted as an equivalent temperature increase of 52 K in the upper mantle. C1 LOS ALAMOS NATL LAB,GEOPHYS GRP,LOS ALAMOS,NM 87545. LAWRENCE LIVERMORE NATL LAB,EXPTL GEOPHYS GRP,LIVERMORE,CA 94550. NR 50 TC 71 Z9 78 U1 2 U2 19 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0956-540X J9 GEOPHYS J INT JI Geophys. J. Int. PD JUL PY 1993 VL 114 IS 1 BP 36 EP 44 DI 10.1111/j.1365-246X.1993.tb01464.x PG 9 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA LM794 UT WOS:A1993LM79400004 ER PT J AU YESLEY, MS AF YESLEY, MS TI YOU TAKE THE HIGH ROAD SO HASTINGS CENTER REPORT LA English DT Note RP YESLEY, MS (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU HASTINGS CENTER PI BRIARCLIFF MANOR PA 255 ELM ROAD, BRIARCLIFF MANOR, NY 10510 SN 0093-0334 J9 HASTINGS CENT REP JI Hastings Cent. Rep. PD JUL-AUG PY 1993 VL 23 IS 4 BP 3 EP 4 PG 2 WC Ethics; Health Care Sciences & Services; Medical Ethics; Social Sciences, Biomedical SC Social Sciences - Other Topics; Health Care Sciences & Services; Medical Ethics; Biomedical Social Sciences GA LQ577 UT WOS:A1993LQ57700004 PM 11643169 ER PT J AU HAMBY, DM ADDIS, RP BEALS, DM BONI, AL CADIEUX, JR CARLTON, WH DUNN, DL HALL, G HAYES, DW HEFFNER, JD LORENZ, R KANTELO, MV TAYLOR, RW AF HAMBY, DM ADDIS, RP BEALS, DM BONI, AL CADIEUX, JR CARLTON, WH DUNN, DL HALL, G HAYES, DW HEFFNER, JD LORENZ, R KANTELO, MV TAYLOR, RW TI ENVIRONMENTAL MONITORING AND DOSE ASSESSMENT FOLLOWING THE DECEMBER 1991 K-REACTOR AQUEOUS TRITIUM RELEASE SO HEALTH PHYSICS LA English DT Article DE ENVIRONMENTAL ASSESSMENT; DOSE ASSESSMENT; TRITIUM; WATER TREATMENT AB Between 22 December and 25 December 1991, approximately 570 L of tritiated water was released from the K Reactor at the Savannah River Site. Analyses of river flow rates and measured tritium concentrations showed that approximately 210 TBq of tritium had been released from the reactor and was being transported down the Savannah River. Elevated tritium concentrations in the Savannah River were first detected on 26 December 1991. The maximum measured tritium concentration at Highway 301 (a major sampling point 37 km downstream of the Savannah River Site) was 2.5 Bq mL-1. A hypothetical maximum individual located at Highway 301 would have received a drinking water dose of approximately 0.35 muSv, less than 1% of the Environmental Protection Agency's 40 muSv y-1 drinking water standard. Concentrations at the intake canals to two water treatment facilities, approximately 160 km downstream, began to rise above normal on 28 December. The population dose to users of the downstream domestic water supplies and consumers of Savannah River biota was estimated to be 4.7 x 10(-3) person-Sv. RP HAMBY, DM (reprint author), WESTINGHOUSE SAVANNAH RIVER CO, SAVANNAH RIVER SITE, AIKEN, SC 29808 USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD JUL PY 1993 VL 65 IS 1 BP 25 EP 32 DI 10.1097/00004032-199307000-00004 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 LH144 UT WOS:A1993LH14400004 PM 8505227 ER PT J AU HAMBY, DM AF HAMBY, DM TI A PROBABILISTIC ESTIMATION OF ATMOSPHERIC TRITIUM DOSE SO HEALTH PHYSICS LA English DT Article DE TRITIUM; ATMOSPHERIC TESTING; DOSE ASSESSMENT; MODELING AB A radiation dose distribution has been calculated for an individual exposed to tritium oxide (tritiated water vapor) in the atmosphere. A specific activity model was used that is similar to that detailed in the Nuclear Regulatory Commission's Regulatory Guide 1.109. The values of 19 parameters are sampled consistent with assigned probability distributions using a Latin Hypercube approach(dagger). Dose was estimated assuming a concentration of tritium in atmospheric moisture of 0.13 +/- 0.16 Bq mL-1. Conventional dosimetric methods for tritium that were consistent with the Regulatory Guide result in an estimate of 0.63 muSv for annual exposures to airborne tritiated water. For the same atmospheric tritium concentration, the estimated dose distribution is lognormal and ranges from 0.08-3.2 muSv (at 95% confidence) with a median value of 0.59 muSv and a 95th percentile of 2.6 muSv. C1 CRYSTAL BALL DECISIONEERING INC, BOULDER, CO 80301 USA. RP HAMBY, DM (reprint author), WESTINGHOUSE SAVANNAH RIVER CO, SAVANNAH RIVER SITE, AIKEN, SC 29808 USA. NR 23 TC 25 Z9 25 U1 1 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 JUL PY 1993 VL 65 IS 1 BP 33 EP 40 DI 10.1097/00004032-199307000-00005 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 LH144 UT WOS:A1993LH14400005 PM 8505228 ER PT J AU KERCHER, JR ROBISON, WL AF KERCHER, JR ROBISON, WL TI UNCERTAINTIES IN PREDICTED RADIONUCLIDE BODY BURDENS AND DOSES FROM DISCRETE STOCHASTIC SOURCE TERMS SO HEALTH PHYSICS LA English DT Article DE RADIONUCLIDE; ENVIRONMENTAL TRANSPORT; METABOLISM; MODELING, DOSE ASSESSMENT ID FOOD-CHAIN MODEL; INGESTION; PATHWAY; TRANSPORT AB Expressions are derived in three cases for the expectation and uncertainty of body burdens and doses calculated from a linear model of environmental transport and human metabolism in terms of expectation and uncertainty in inputs of discrete, stochastic random variables. Three cases are compared to determine the relationship of the expectations and uncertainties under varying assumptions. In the constant input case, the input is selected randomly at the outset of the simulation period [0,T] from the distribution to which the population is exposed and then is held constant throughout [0,T]. In the two time-varying cases, random and autoregressive, it was assumed that N discrete stochastic exposures to the input were made uncorrelated and partially correlated, respectively. Each exposure was constant during each time interval of length T/N. ne expectation values of the body burdens and doses in the constant input case were identical to those in the random case and the autoregressive cases for stationary inputs. The uncertainties of the body burdens and the doses in the constant input case were identical in the limit of rapid metabolism to those of the random case and the autoregressive cases for stationary inputs. In the limit of slow metabolism, the uncertainties of the body burdens and the doses in the constant input case were N1/2 and (3N/4)1/2, respectively, greater than those in the random case and were {(1 + alpha)/[(1 - alpha)N]}1/2 and {4(1 + alpha)/[3(1 - alpha)N]}1/2, respectively, greater than those in the autoregressive case for stationary inputs and autocorrelation coefficient alpha. That is, increasing the number of sampling periods decreases the uncertainty and increasing the autocorrelation increases the uncertainty. In an example application for ingestion of Cs-137 at Bikini Island, a weak form of both slow and rapid metabolism limits apply and give the result that the uncertainty of the body burden in the constant input case is 18 times greater than the random case. For alpha = 0.5, the uncertainty of the body burden in the autoregressive case is 1.7 times greater than the random case. The smooth transition of the autoregressive case from the random case to the constant input case is shown as alpha increases from 0 (random) to 1 (constant). RP LAWRENCE LIVERMORE NATL LAB, DIV ENVIRONM SCI, L-524, POB 808, LIVERMORE, CA 94550 USA. NR 40 TC 3 Z9 3 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA TWO COMMERCE SQ, 2001 MARKET ST, PHILADELPHIA, PA 19103 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD JUL PY 1993 VL 65 IS 1 BP 47 EP 68 DI 10.1097/00004032-199307000-00007 PG 22 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 LH144 UT WOS:A1993LH14400007 PM 8505230 ER PT J AU MOORE, ME MCFARLAND, AR RODGERS, JC AF MOORE, ME MCFARLAND, AR RODGERS, JC TI FACTORS THAT AFFECT ALPHA-PARTICLE DETECTION IN CONTINUOUS AIR MONITOR APPLICATIONS SO HEALTH PHYSICS LA English DT Article DE RADIATION, ALPHA; AEROSOLS; RADIATION MONITORS; SAMPLING ID ENERGY AB An experimental study was conducted to characterize the full-width half-maximum values, peak shapes, and peak shifts of the energy spectra from alpha emitters in the forms of particulate matter on sampling filters and electro-deposited plated sources. Monodisperse 1.0-mum anhydrous uranium acetate aerosol particles were collected on seven types of sampling filters. Full-width half-maximum values at atmospheric pressure varied from 373 keV for a 3-mum pore size Fluoropore filter to 584 keV for a glass fiber filter. Monodisperse uranium acetate aerosols from 1.2-8.1 mum were collected on Millipore 1.2-mum pore size membrane filters to examine the self-absorption effect. Under vacuum, the corresponding full-width half-maximum values ranged from 241-1,011 keV. Successively heavier mass loadings of monodisperse 1.8-mum uranium acetate particles from 13.7-127 mug cm-2 caused the values to increase from 420 to 580 keV. With an electroplated 23.9-mm-diameter Pu-239 source and a 25.4-mm detector, the distance between source and detector was incrementally increased from 3.2 to 6.4 mm-a range of distances that is typical of those found in alpha continuous air monitors. At atmospheric pressure, the values increased from 280 to 330 keV and the detector efficiency decreased from 30.5% to 20.9%. Tests with various sizes of sources and detectors suggest that a continuous air monitor should be designed so that the two are of approximately equal size. C1 LOS ALAMOS NATL LAB, MEASUREMENTS TECHNOL SUPPORT SECT, HLTH PHYS MEASUREMENT GRP HS-4, LOS ALAMOS, NM 87545 USA. RP MOORE, ME (reprint author), TEXAS A&M UNIV SYST, DEPT MECH ENGN, AEROSOL TECHNOL LAB, COLL STN, TX 77843 USA. NR 16 TC 13 Z9 13 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 JUL PY 1993 VL 65 IS 1 BP 69 EP 81 DI 10.1097/00004032-199307000-00008 PG 13 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 LH144 UT WOS:A1993LH14400008 PM 8505231 ER PT J AU MUSOLINO, S ROHRIG, N BAKER, T AF MUSOLINO, S ROHRIG, N BAKER, T TI INTERCOMPARISON OF DOSIMETRY MEASUREMENTS AT THE ALTERNATING GRADIENT-SYNCHROTRON FROM 1986-1988 SO HEALTH PHYSICS LA English DT Article DE DOSIMETRY, PERSONNEL; NEUTRON DOSIMETRY; NEUTRONS; ACCELERATORS AB The responses of several types of high-energy personnel neutron dosimeters were studied in the operational radiation fields at the Alternating Gradient Synchrotron. Included in the study are intercomparisons of polycarbonate, type A neutron track emulsion, allyl diglycol carbonate, electrochemical etch allyl diglycol carbonate, TLD-600, and TLD-700. Some of the passive measurements were compared with active tissue-equivalent instruments. The trend for many but not all of the measurements was for type A neutron track emulsion to report the highest neutron dose equivalent. The polycarbonate returned intermediate values while allyl diglycol carbonate usually reported the smallest values. Quality assurance data from calibration sources through 1990 are also provided. C1 EG&G IDAHO INC, IDAHO FALLS, ID 83415 USA. UNIV N CAROLINA, DEPT ENVIRONM SCI & ENGN, CHAPEL HILL, NC 27514 USA. RP MUSOLINO, S (reprint author), BROOKHAVEN NATL LAB, BLDG 10055-4, UPTON, NY 11973 USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD JUL PY 1993 VL 65 IS 1 BP 96 EP 102 DI 10.1097/00004032-199307000-00013 PG 7 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA LH144 UT WOS:A1993LH14400013 PM 8505236 ER PT J AU PASTERIS, NG TRASK, BJ SHELDON, S GORSKI, JL AF PASTERIS, NG TRASK, BJ SHELDON, S GORSKI, JL TI DISCORDANT PHENOTYPE OF 2 OVERLAPPING DELETIONS INVOLVING THE PAX3 GENE IN CHROMOSOME-2Q35 SO HUMAN MOLECULAR GENETICS LA English DT Article ID KLEIN-WAARDENBURG SYNDROME; PAIRED DOMAIN; SYNDROME WS; MUTATION; MOUSE; LOCALIZATION; CONSERVATION; MUTANTS; LINKAGE; MARKERS AB Waardenburg syndrome (WS), the most common form of inherited congenital deafness, is a pleiotropic, autosomal dominant condition with variable penetrance and expressivity. WS is clinically and genetically heterogeneous. The basis for the phenotypic variability observed among and between WS families is unknown. However, mutations within the paired-box gene, PAX3, have been associated with a subset of WS patients. In this report we use cytogenetic and molecular genetic techniques to study a patient with WS type 3, a form of WS consisting of typical WS type 1 features plus mental retardation, microcephaly, and severe skeletal anomalies. Our results show that the WS3 patient has a de novo paternally derived deletion, del (2)(q35q36), that spans the genetic loci PAX3 and COL4A3. A molecular analysis of a chromosome 2 deletional mapping panel maps the PAX3 locus to 2q35 and suggests the locus order: centromere-(INHA, DES)-PAX3-COL4A3-(ALPI, CHRND)-telomere. Our analyses also show that a patient with a cleft palate and lip pits, but lacking diagnostic WS features, has a deletion, del (2)(q33q35), involving the PAX3 locus. This result suggests that not all PAX3 mutations are associated with a WS phenotype and that additional regional loci may modify or regulate the PAX3 locus and/or the development of a WS phenotype. C1 UNIV MICHIGAN,MED CTR,DEPT HUMAN GENET,DIV PEDIAT GENET,3570 MED SCI RES BLDG 2,BOX 0688,ANN ARBOR,MI 48109. UNIV MICHIGAN,MED CTR,DEPT PATHOL,ANN ARBOR,MI 48109. UNIV MICHIGAN,MED CTR,DEPT PEDIAT,ANN ARBOR,MI 48109. UNIV MICHIGAN,MED CTR,DEPT COMMUNICABLE DIS,ANN ARBOR,MI 48109. LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,LIVERMORE,CA 94550. FU NHGRI NIH HHS [HG-00256]; NICHD NIH HHS [HD-23768] NR 56 TC 28 Z9 29 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 JUL PY 1993 VL 2 IS 7 BP 953 EP 959 DI 10.1093/hmg/2.7.953 PG 7 WC Biochemistry & Molecular Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Genetics & Heredity GA LM668 UT WOS:A1993LM66800019 PM 8103404 ER PT J AU MAX, N CRAWFIS, R WILLIAMS, D AF MAX, N CRAWFIS, R WILLIAMS, D TI VISUALIZATION FOR CLIMATE MODELING SO IEEE COMPUTER GRAPHICS AND APPLICATIONS LA English DT Article RP MAX, N (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. RI Crawfis, Roger/F-9873-2014 OI Crawfis, Roger/0000-0002-5667-2741 NR 16 TC 12 Z9 13 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 0272-1716 J9 IEEE COMPUT GRAPH JI IEEE Comput. Graph. Appl. PD JUL PY 1993 VL 13 IS 4 BP 34 EP 40 DI 10.1109/38.219448 PG 7 WC Computer Science, Software Engineering SC Computer Science GA LJ999 UT WOS:A1993LJ99900008 ER PT J AU CANDY, JV SULLIVAN, EJ AF CANDY, JV SULLIVAN, EJ TI SOUND-VELOCITY PROFILE ESTIMATION - A SYSTEM-THEORETIC APPROACH SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article ID SOURCE LOCALIZATION; VERTICAL ARRAY; SHALLOW-WATER AB A system-theoretic approach is proposed to investigate the feasibility of reconstructing a sound velocity profile (SVP) from acoustical hydrophone measurements. This problem is based on a state-space representation of the normal-mode propagation model. It is shown' that this representation can be utilized to investigate the so-called observability of the SVP from noisy measurement data. A model-based processor is developed to extract the required information and it is shown that even in cases where limited SVP information is available, the SVP can be estimated using this approach. Based on this framework, investigations are made, of model-based solutions to the sound velocity profile and related parameter estimation problems. In particular, a processor is designed that allows in situ recursive estimation of the sound velocity profile from simulated data. C1 USN,CTR UNDERSEA WARFARE,NEWPORT,RI 02841. RP CANDY, JV (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR ADV SIGNAL & IMAGE SCI,LIVERMORE,CA 94550, USA. NR 28 TC 21 Z9 23 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 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD JUL PY 1993 VL 18 IS 3 BP 240 EP 252 DI 10.1109/JOE.1993.236362 PG 13 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA LZ422 UT WOS:A1993LZ42200010 ER PT J AU LEE, TG AF LEE, TG TI MULTIPLE EXTRACTION CAVITIES FOR HIGH-POWER KLYSTRONS SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article AB The design, performance, and comparison with 2D computer simulations of an X-band high-power klystron amplifier utilizing an output circuit consisting of two uncoupled output cavities are described. It is shown that good efficiency, low RF gap gradient, relatively uniform power extraction from each cavity, and freedom from oscillations due to extraneous modes can be achieved. The change in phase relative to the RF input for the two extraction cavities is relatively small within a frequency bandwidth on the order of 1%, and when the beam voltage or drive power is varied over a moderate range. For narrow-band applications, where the combining of the separate outputs is desired, good combining efficiency is possible. The number of extraction cavities can be extended to obtain still higher peak powers. RP LEE, TG (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 8 TC 3 Z9 7 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD JUL PY 1993 VL 40 IS 7 BP 1329 EP 1334 DI 10.1109/16.216440 PG 6 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA LH050 UT WOS:A1993LH05000020 ER PT J AU KIDO, J NAGAI, K OKAMOTO, Y AF KIDO, J NAGAI, K OKAMOTO, Y TI BRIGHT ORGANIC ELECTROLUMINESCENT DEVICES WITH DOUBLE-LAYER CATHODE SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Note ID 3-LAYER STRUCTURE; HOLE TRANSPORT; COMPLEX; FILMS AB Electroluminescent devices were fabricated using a diamine derivative and Tris(8-quinolinolato)aluminum(III) complex as the hole transport layer and the emitting layer, respectively. The cell structure of glass substrate/anode/hole transport layer/emitting layer/cathode was employed. The anode was indium-tin oxide (ITO) transparent electrode, and the cathode was a double layer consisting of the first layer of Mg, or Li and the second layer of Ag. Intense bright green emission with luminance of 40 400 cd/m2 was achieved at 18 V with a current density of 330 mA/cm2 for the cell with the doped Al complex with 1 mol % of coumarin 6 and Li/ag as the cathode. C1 POLYTECH INST NEW YORK,DEPT CHEM,BROOKLYN,NY 11201. BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. RP KIDO, J (reprint author), YAMAGATA UNIV,DEPT MAT SCI & ENGN,YONEZAWA,YAMAGATA 992,JAPAN. RI KIDO, Junji/H-3049-2012 NR 15 TC 67 Z9 67 U1 1 U2 9 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD JUL PY 1993 VL 40 IS 7 BP 1342 EP 1344 DI 10.1109/16.216443 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA LH050 UT WOS:A1993LH05000023 ER PT J AU ALUMBAUGH, DL MORRISON, HF AF ALUMBAUGH, DL MORRISON, HF TI ELECTROMAGNETIC CONDUCTIVITY IMAGING WITH AN ITERATIVE BORN INVERSION SO IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING LA English DT Article; Proceedings Paper CT 12TH IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMP ( IGARSS 92 ) CY MAY 26-29, 1992 CL LEAGUE CITY, TX SP IEEE, GEOSCI & REMOTE SENSING SOC, UNION RADIO SCI ENGINEERS ID SIMULTANEOUS RECONSTRUCTION; PERMITTIVITY AB A technique is developed which uses low frequency electromagnetic (EM) fields to image the earth's conductivity structure between tow boreholes. The scheme employs the Born approximation to linearize the integral equation formulation, and a regularized least squares method to invert the data for an initial estimate of the conductivity. A second Born approximation is then applied in a iterative manner to achieve better estimates of the structure. Numerical experiments show that this iterative method improves resolution when compared to normal Born inversion due to the fact that coupling between scattering currents is accounted for. The image quality is shown to be dependent on the operating frequency with the optimal frequency corresponding to the peak of a sensitivity function we have termed the Born kernel which is the product of the primary electric field and the Green's function. C1 UNIV CALIF BERKELEY,BERKELEY,CA 94720. RP ALUMBAUGH, DL (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 20 TC 18 Z9 21 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 0196-2892 J9 IEEE T GEOSCI REMOTE JI IEEE Trans. Geosci. Remote Sensing PD JUL PY 1993 VL 31 IS 4 BP 758 EP 763 DI 10.1109/36.239897 PG 6 WC Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing; Imaging Science & Photographic Technology SC Geochemistry & Geophysics; Engineering; Remote Sensing; Imaging Science & Photographic Technology GA ME122 UT WOS:A1993ME12200002 ER PT J AU KEY, TS LAI, JS AF KEY, TS LAI, JS TI COMPARISON OF STANDARDS AND POWER-SUPPLY DESIGN OPTIONS FOR LIMITING HARMONIC DISTORTION IN POWER-SYSTEMS SO IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS LA English DT Article AB Harmonic distortion in power systems is growing due to the popularity of switch-mode power electronic equipment. This equipment has recognized advantages, such as reducing weight and improving control and efficiency in power converters and supplies. A disadvantage of switch-mode power converters is that their lowest-cost circuit may burden the power system with harmonic loading. Methods to reduce this distortion are recognized, but economic incentives are yet to be realized. Standardization is the most effective means to influence equipment design and to control distortion in power systems. This paper compares the major European and American standards, as well as some of the electronic equipment design changes that are supposed to limit harmonics. C1 OAK RIDGE NATL LAB,DIV ENGN TECHNOL,OAK RIDGE,TN 37831. RP KEY, TS (reprint author), POWER ELECTR APPLICAT CTR,KNOXVILLE,TN 37932, USA. OI Lai, Jihsheng/0000-0003-2315-8460 NR 5 TC 53 Z9 55 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 0093-9994 J9 IEEE T IND APPL JI IEEE Trans. Ind. Appl. PD JUL-AUG PY 1993 VL 29 IS 4 BP 688 EP 695 DI 10.1109/28.231980 PG 8 WC Engineering, Multidisciplinary; Engineering, Electrical & Electronic SC Engineering GA LW977 UT WOS:A1993LW97700002 ER PT J AU RUBINSTEIN, F SIMINOVITCH, M VERDERBER, R AF RUBINSTEIN, F SIMINOVITCH, M VERDERBER, R TI 50 PERCENT ENERGY SAVINGS WITH AUTOMATIC LIGHTING CONTROLS SO IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS LA English DT Article AB An electronically ballasted lighting control system was demonstrated at an office building in the San Francisco Bay Area. The system was used to demonstrate the energy savings and demand-reduction capabilities of a lighting control system designed to exploit all major control strategies, including scheduling, daylighting, and lumen maintenance. After 9 mo of operation, lighting energy savings of approximately 50% relative to previous usage have been consistently achieved. A novel, two-part control photocell that permits successful implementation of daylighting and lumen maintenance strategies was demonstrated. RP RUBINSTEIN, F (reprint author), LAWRENCE BERKELEY LAB,LIGHTING SYST RES GRP,ENERGY EFFICIENT FIXTURES LAB,BERKELEY,CA 94720, USA. NR 4 TC 26 Z9 26 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 0093-9994 J9 IEEE T IND APPL JI IEEE Trans. Ind. Appl. PD JUL-AUG PY 1993 VL 29 IS 4 BP 768 EP 773 DI 10.1109/28.231992 PG 6 WC Engineering, Multidisciplinary; Engineering, Electrical & Electronic SC Engineering GA LW977 UT WOS:A1993LW97700014 ER PT J AU SABLIK, MJ JILES, DC AF SABLIK, MJ JILES, DC TI COUPLED MAGNETOELASTIC THEORY OF MAGNETIC AND MAGNETOSTRICTIVE HYSTERESIS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article ID FERROMAGNETIC HYSTERESIS; PREISACH MODEL; STRESS; TERFENOL; CURVES AB A physical model is developed for the coupling between magnetic and magnetostrictive hysteresis and for the effect of mechanical stress on both types of hysteresis. The Jiles-Atherton-Sablik model for magnetomechanical hysteresis is reviewed and interpreted. In that model, under applied stress, the magnetization is coupled to magnetostriction through the derivative of the magnetostriction with respect to magnetization (dlambda/dM). The magnetostriction is also a function of the magnetization even in the absence of stress. An expression for the magnetostriction is derived from minimization of the internal energy with respect to strains, which is necessary for mechanical equilibrium. In the case where stress sigma and field H are coaxial and where the material is assumed to be isotropic, the resulting strain consists of a mechanical strain sigma/Y, where Y is Young's modulus, and a magnetostrain which goes to zero at saturation (DELTAE effect). From the magnetostrain, the magnetostriction is obtained, using the convention that magnetostriction is zero in the unmagnetized state. By taking into account fluctuations in the magnetic energy due to hysteresis, one finds that the magnetostriction initially moves to higher values as the magnitude of the flux density B decreases from its extremum value in lambda versus B plots. Also, in a quasi-dc variation of the external field H, the magnetostriction exhibits a nonzero value at the lowest value of its hysteresis loop, although in the unmagnetized state, the magnetostriction is zero. Various numerical cases are evaluated, and the modeling is compared to previous measurements in polycrystalline iron and steel and in terfenol and Ni-Zn ferrites. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,INST PHYS RES & TECHNOL,AMES,IA 50011. RP SABLIK, MJ (reprint author), SW RES INST,PO DRAWER 28510,SAN ANTONIO,TX 78228, USA. RI Jiles, David/H-9548-2012 NR 46 TC 199 Z9 209 U1 3 U2 47 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD JUL PY 1993 VL 29 IS 4 BP 2113 EP 2123 DI 10.1109/20.221036 PG 11 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA LJ255 UT WOS:A1993LJ25500003 ER PT J AU GIESE, RF RUNDE, M AF GIESE, RF RUNDE, M TI ASSESSMENT STUDY OF SUPERCONDUCTING FAULT-CURRENT LIMITERS OPERATING AT 77-K SO IEEE TRANSACTIONS ON POWER DELIVERY LA English DT Article; Proceedings Paper CT 1992 SUMMER MEETING OF IEEE / POWER-ENGINEERING-SOC CY JUL 12-16, 1992 CL SEATTLE, WA SP IEEE, POWER ENGN SOC AB The possible impact of nitrogen-cooled superconductors on the design and cost of superconducting fault-current limiters is assessed by considering the technical specifications such devices must meet and by comparing material properties of 77-K and 4-K superconductors. The main advantage of operating superconductors at 77 K is that the refrigeration operating cost is reduced by a factor of up to 25, and the refrigeration capital cost is reduced by a factor of up to 10. The heat capacity at 77 K is several orders of magnitude larger than at 4 K. This phenomenon increases conductor stability against flux jumps but makes switching from the superconducting to normal state slow and difficult. Consequently, a high critical current density, probably at least 10(5) A/cm2, is required. C1 NORWEGIAN ELECT POWER RES INST,N-7034 TRONDHEIM,NORWAY. RP GIESE, RF (reprint author), ARGONNE NATL LAB,DIV ENERGY SYST,ARGONNE,IL 60439, USA. NR 16 TC 29 Z9 31 U1 1 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0885-8977 J9 IEEE T POWER DELIVER JI IEEE Trans. Power Deliv. PD JUL PY 1993 VL 8 IS 3 BP 1138 EP 1147 DI 10.1109/61.252638 PG 10 WC Engineering, Electrical & Electronic SC Engineering GA LY720 UT WOS:A1993LY72000042 ER PT J AU Malone, KT Fischer, TR AF Malone, Kevin T. Fischer, Thomas R. TI Enumeration and Trellis-Searched Coding Schemes for Speech LSP Parameters SO IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING LA English DT Article AB Speech coders employing forward adaptive predictive coding (APC) and operating at medium-to-low bit rates necessitate efficient encoding of the linear predictive coding (LPC) coefficients. Line spectrum pair (LSP) parameters are currently one of the most efficient choices of transmission parameters for the LPC coefficients. This paper briefly reviews LSP parameters and presents several low delay coding schemes for the parameters. The coders are simulated using data generated from both the autocorrelation and covariance LPC analysis methods. The performances of the coders are given for a variety of rates and LPC analysis conditions. The most efficient scheme developed herein uses a predictive form of trellis coded quantization (TCQ). Its performance is comparable or superior to that of other low delay LSP coding schemes in the literature. An enumeration scheme that reduces the rate of a given scalar quantization structure without decreasing coder performance is also presented. C1 [Malone, Kevin T.] Sandia Natl Labs, Commun Syst Div, Albuquerque, NM 87185 USA. [Fischer, Thomas R.] Washington State Univ, Sch Elect Engn & Comp Sci, Pullman, WA 99164 USA. RP Malone, KT (reprint author), Sandia Natl Labs, Commun Syst Div, POB 5800, Albuquerque, NM 87185 USA. FU National Science Foundation [MIP-8619888] FX Manuscript received January 14, 1991; revised May 17, 1992. This work was supported in part by the National Science Foundation under Grant MIP-8619888. The associate editor coordinating the review of this paper and approving it for publication was Dr. Brian A. Hanson. NR 21 TC 7 Z9 7 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 1063-6676 J9 IEEE T SPEECH AUDI P JI IEEE Trans. Speech Audio Process. PD JUL PY 1993 VL 1 IS 3 BP 304 EP 314 DI 10.1109/89.232614 PG 11 WC Acoustics; Engineering, Electrical & Electronic SC Acoustics; Engineering GA V04SR UT WOS:000207078600005 ER PT J AU MINACHI, A YOU, Z BRUCE, R LORD, W AF MINACHI, A YOU, Z BRUCE, R LORD, W TI PREDICTIONS OF THE GAUSS-HERMITE BEAM MODEL AND FINITE-ELEMENT METHOD FOR ULTRASONIC PROPAGATION THROUGH ANISOTROPIC STAINLESS-STEEL SO IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL LA English DT Article AB The predictions of the Gauss-Hermite beam model are compared to those obtained by the finite element method for a model problem. This is motivated by the desire to examine the trade-offs between greater computational speed and less accuracy in the Gauss-Hermite model. In the model problem, a contact strip transducer radiates through an isotropic layer of ferritic steel into an anisotropic layer of austenitic stainless steel with various directions of the preferred axis of columnar grain alignment. Comparisons are made of time-domain waveforms in a common observation axis in the austenitic material. The predictions of the two models are found to be in good agreement near the center of the beam, with deviations developing as one moves away from the central ray. These are interpreted to be a consequence of the Fresnel approximation made in the Gauss-Hermite model. However, the region that contains most of the energy is in the vicinity of the central ray, where there is excellent agreement between the two models. This loss in accuracy is accompanied by a several orders of magnitude increase in computation time. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,DIV SCI & TECH,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN MECH,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,COLL ENGN,AMES,IA 50011. RP MINACHI, A (reprint author), IOWA STATE UNIV SCI & TECHNOL,CTR NONDESTRUCT EVALUAT,AMES,IA 50011, USA. NR 13 TC 3 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0885-3010 J9 IEEE T ULTRASON FERR JI IEEE Trans. Ultrason. Ferroelectr. Freq. Control PD JUL PY 1993 VL 40 IS 4 BP 338 EP 346 DI 10.1109/58.251282 PG 9 WC Acoustics; Engineering, Electrical & Electronic SC Acoustics; Engineering GA LR851 UT WOS:A1993LR85100009 PM 18263189 ER PT J AU WHITING, WB TONG, TM REED, ME AF WHITING, WB TONG, TM REED, ME TI EFFECT OF UNCERTAINTIES IN THERMODYNAMIC DATA AND MODEL PARAMETERS ON CALCULATED PROCESS PERFORMANCE SO INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH LA English DT Article ID PROCESS DESIGN; SENSITIVITY AB A technique is presented to use Monte Carlo simulation with Latin-hypercube sampling to determine the uncertainty of process operation to thermodynamic model parameters. Significant changes in process variables are shown for superfractionator and flash examples when reasonable uncertainties are applied to pure-component and binary-interaction parameters in an equation of state model. These uncertainties are quantified both as cumulative probability distributions and as sensitivity coefficients. Thus, the technique provides a quantitative alternative to design safety factors, and it can be used as an indicator of data deficiencies. The examples show the importance of using consistent error estimates for thermodynamic data and the importance of studying the uncertainty of operation of proposed units. C1 MORGANTOWN ENERGY TECHNOL CTR,MORGANTOWN,WV 26507. RP WHITING, WB (reprint author), W VIRGINIA UNIV,DEPT CHEM ENGN,MORGANTOWN,WV 26506, USA. NR 21 TC 26 Z9 26 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0888-5885 J9 IND ENG CHEM RES JI Ind. Eng. Chem. Res. PD JUL PY 1993 VL 32 IS 7 BP 1367 EP 1371 DI 10.1021/ie00019a011 PG 5 WC Engineering, Chemical SC Engineering GA LM526 UT WOS:A1993LM52600011 ER PT J AU EVANS, G GREIF, R AF EVANS, G GREIF, R TI THERMALLY UNSTABLE CONVECTION WITH APPLICATIONS TO CHEMICAL-VAPOR-DEPOSITION CHANNEL REACTORS SO INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER LA English DT Article ID MATHEMATICAL-MODEL; MIXED CONVECTION; FLOW; MOCVD; CVD AB The three dimensional, thermally unstable flow and heat transfer of a gas have been studied in a horizontal channel with applications to chemical vapor deposition (CVD). The cases examined include flows that exhibit a longitudinal roll instability and a combination of both transverse, traveling waves and longitudinal rolls. Detailed results are presented for two values of the temperature ratio epsilon = (T(l)-T(o))/T(o) = 0.01 and 2.33 (helium), Grashof number Gr = gepsilonH-3/nu(o)2 = 125 000, Prandtl number Pr = nu(o)/alpha(o) = 2/3, aspect ratios L/H = 10 and W/H = 2. For epsilon = 0.01 and Reynolds number Re = uHBAR/nu(o) = 250, longitudinal rolls result whereas for Re = 100 a combination of transverse waves and longitudinal rolls occurs. For epsilon = 2.33 and Re = 100 the longitudinal roll instability is present. C1 UNIV CALIF BERKELEY,DEPT MECH ENGN,BERKELEY,CA 94720. RP EVANS, G (reprint author), SANDIA NATL LABS,DIV COMPUTAT MECH,LIVERMORE,CA 94550, USA. NR 19 TC 26 Z9 26 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0017-9310 J9 INT J HEAT MASS TRAN JI Int. J. Heat Mass Transf. PD JUL PY 1993 VL 36 IS 11 BP 2769 EP 2781 DI 10.1016/0017-9310(93)90096-O PG 13 WC Thermodynamics; Engineering, Mechanical; Mechanics SC Thermodynamics; Engineering; Mechanics GA LK676 UT WOS:A1993LK67600005 ER PT J AU TUCKER, JD RAMSEY, MJ LEE, DA MINKLER, JL AF TUCKER, JD RAMSEY, MJ LEE, DA MINKLER, JL TI VALIDATION OF CHROMOSOME PAINTING AS A BIODOSIMETER IN HUMAN PERIPHERAL LYMPHOCYTES FOLLOWING ACUTE EXPOSURE TO IONIZING-RADIATION IN-VITRO SO INTERNATIONAL JOURNAL OF RADIATION BIOLOGY LA English DT Article ID FLUORESCENCE INSITU HYBRIDIZATION; SEMIAUTOMATED KARYOTYPING SYSTEM; SISTER CHROMATIDS; TRANSLOCATIONS; ABERRATIONS; LIBRARIES; IRRADIATION AB Fluorescence in situ hybridization with chromosome-specific composite DNA probes ('chromosome painting') appears to be a useful tool for quantifying symmetrical cytogenetic damage. However, a thorough comparison between chromosome painting and the conventional methods of GTG-banding and dicentric analysis has not been performed. We have undertaken the validation of chromosome painting using human blood exposed in vitro to Cs-137 gamma-rays at doses ranging from 0 to 400 cGy, then cultured according to standard procedures and harvested at 52h. For painting, bound probes were detected either with fluoresceinated avidin and counterstained with propidium iodide, or with ChromoBlue WCP Probe and Giemsa. The first approach utilizes ultraviolet excitation in which painted chromosomes appear yellow and the remaining chromosomes appear red. The ChromoBlue labelling approach requires ordinary light microscopy in which painted chromosomes appear dark blue and the remaining chromosomes appear light blue. With each method, exchanges between painted and unpainted chromosomes appear bicoloured. Because only a fraction of all possible exchanges are detected, the number of metaphases examined is adjusted according to the fraction of the genome painted. We have performed painting by several methods, including fluorescence with chromosome 4 probe alone, fluorescence with probes for chromosomes 1, 3 and 4 simultaneously, and chromogenic painting with chromosome 4 probe alone. The results obtained by the various painting methods were compared with GTG-banded cells which were examined for both translocations and dicentrics. In addition, unbanded metaphases stained with Giemsa were scored for dicentrics. Our data show that the frequency of chromosome exchanges detected by painting and banding agree with each other and with the number of dicentrics seen in unbanded cells, at least at doses of less-than-or-equal-to 200 cGy. RP TUCKER, JD (reprint author), LAWRENCE LIVERMORE NATL LIB,BIOL & BIOTECHNOL RES PROGRAM,POB 808,LIVERMORE,CA 94551, USA. NR 25 TC 151 Z9 153 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0955-3002 J9 INT J RADIAT BIOL JI Int. J. Radiat. Biol. PD JUL PY 1993 VL 64 IS 1 BP 27 EP 37 DI 10.1080/09553009314551081 PG 11 WC Biology; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA LT100 UT WOS:A1993LT10000003 PM 8102168 ER PT J AU TAO, F MEDVEDOVSKY, C DAVID, J BROGLIO, T POWERSRISIUS, P ALPEN, EL WORGUL, BV AF TAO, F MEDVEDOVSKY, C DAVID, J BROGLIO, T POWERSRISIUS, P ALPEN, EL WORGUL, BV TI ACCELERATED HEAVY-IONS AND THE LENS .9. LATE EFFECTS OF LET AND DOSE ON CELLULAR-PARAMETERS IN THE MURINE LENS SO INTERNATIONAL JOURNAL OF RADIATION BIOLOGY LA English DT Article ID X-IRRADIATION; PARTICLES; CELLS; EPITHELIUM; RADIATION; INACTIVATION; MICRONUCLEI; INDUCTION; NEUTRON; DAMAGE AB Lenses of mice irradiated with 250 MeV protons, 670 MeV/amu Ne-20, 600 MeV/amu Fe-56, 350 MeV/amu Fe-56, 600 MeV/amu Nb-93 or 593 MeV/amu La-139 ions were evaluated by analysing cytopathological indicators which have been implicated in the cataractogenic process. The LETs ranged from 0.39 to 953 keV/mum and the fluences from 1.31 x 10(3)/mm2 to 5.12 x 10(7)/mm2. The lenses were assessed 64 weeks post-irradiation in order to observe the late effects of LET and dose on the target cell population of the lens' epithelium. Our studies showed that growth-dependent pathological changes occurred at the cellular level as a function of dose and LET. For a given particle dose, as the LET rose, the number of abnormal mitotic figures, micronuclei frequency, and the disorganization of meridional rows increased to a maximum and then reached a plateau or decreased. For particles of the same LET, the severity of meridional rows disorganization and micronuclei frequency increased with increasing dose. The numbers of cells surviving at late times post-irradiation were comparable with those of controls. In addition, the cellular density was similarly unaffected. These observations are consistent with the current theory of the mechanism of radiation cataractogenesis which posits that genomic damage to the epithelial cells surviving the exposure is responsible for opacification. C1 COLUMBIA UNIV,DEPT OPHTHALMOL,EYE RADIAT & ENVIRONM RES LAB,630 W 168TH ST,NEW YORK,NY 10032. LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. FU NEI NIH HHS [NEI-EY02648] NR 42 TC 4 Z9 4 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 JUL PY 1993 VL 64 IS 1 BP 103 EP 111 DI 10.1080/09553009314551151 PG 9 WC Biology; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA LT100 UT WOS:A1993LT10000010 PM 8102162 ER PT J AU KAGOSHIMA, Y WANG, JD ANDO, M AOKI, S ANDERSON, E ATTWOOD, D KERN, D AF KAGOSHIMA, Y WANG, JD ANDO, M AOKI, S ANDERSON, E ATTWOOD, D KERN, D TI SUB-100-NM-RESOLUTION ZONE-PLATE SOFT-X-RAY MICROSCOPE USING UNDULATOR RADIATION SO JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS LA English DT Note DE SOFT X-RAY MICROSCOPE; FRESNEL ZONE PLATE; HIGH RESOLUTION; DIFFRACTION ORDER; SYNCHROTRON RADIATION; UNDULATOR RADIATION; HIGHER HARMONICS; SPATIAL RESOLUTION ID BEAMLINE AB A high-resolution soft X-ray microscope has been constructed using a Fresnel zone plate (FZP) as its objective and undulator radiation as its source. The FZP used has the outermost zone width of 50 nm corresponding to theoretical spatial resolution of 60 nm as a microscope. An experiment has shown that the microscope attained resolution better than 100 nm. C1 GRAD UNIV ADV STUDIES,DEPT SYNCHROTRON RADIAT SCI,TSUKUBA,IBARAKI 305,JAPAN. UNIV TSUKUBA,INST APPL PHYS,TSUKUBA,IBARAKI 305,JAPAN. IBM CORP,THOMAS J WATSON RES CTR,NANOLITHOG GRP,YORKTOWN HTS,NY 10598. LAWRENCE BERKELEY LAB,CTR XRAY OPT,BERKELEY,CA 94720. RP KAGOSHIMA, Y (reprint author), NATL LAB HIGH ENERGY PHYS,PHOTON FACTORY,TSUKUBA,IBARAKI 305,JAPAN. NR 12 TC 2 Z9 2 U1 0 U2 1 PU JAPAN J APPLIED PHYSICS PI MINATO-KU TOKYO PA DAINI TOYOKAIJI BLDG 24-8 SHINBASHI 4-CHOME, MINATO-KU TOKYO 105, JAPAN SN 0021-4922 J9 JPN J APPL PHYS 1 JI Jpn. J. Appl. Phys. Part 1 - Regul. Pap. Short Notes Rev. Pap. PD JUL PY 1993 VL 32 IS 7 BP 3332 EP 3333 DI 10.1143/JJAP.32.3332 PG 2 WC Physics, Applied SC Physics GA LR737 UT WOS:A1993LR73700042 ER PT J AU VIANCO, PT FREAR, DR AF VIANCO, PT FREAR, DR TI ISSUES IN THE REPLACEMENT OF LEAD-BEARING SOLDERS SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Article AB The use of soft solders, particularly those containing lead, dates back nearly 5,000 years. Solders similar to the materials used to seal the aqueducts of ancient Rome are now an important building block in the manufacture of high-speed computer assemblies. This history attests to the technological versatility of soft solders and, in particular, the solder alloys that contain lead. However, the health effects of prolonged exposure to lead have also been documented; measures to limit human exposure-at the work place and indirectly through the environment-are being considered. The successful introduction of lead-free solders in to future electronic products will rely heavily upon their solderability, which can be evaluated by test procedures such as the meniscometer/wetting balance technique and the capillary flow test. C1 SANDIA NATL LABS,DEPT MECH & CORROS MET,ALBUQUERQUE,NM 87185. RP VIANCO, PT (reprint author), SANDIA NATL LABS,DEPT PHYS & JOINING MET,ALBUQUERQUE,NM 87185, USA. NR 21 TC 169 Z9 169 U1 1 U2 9 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD JUL PY 1993 VL 45 IS 7 BP 14 EP 19 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA LL540 UT WOS:A1993LL54000002 ER PT J AU MORRIS, JW GOLDSTEIN, JLF MEI, Z AF MORRIS, JW GOLDSTEIN, JLF MEI, Z TI MICROSTRUCTURE AND MECHANICAL-PROPERTIES OF SN-IN AND SN-BI SOLDERS SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Article AB This article presents information that helps to clarify the behavior of lead-free, low-melting, eutectic Sn-In and Sn-Bi solders. The Sn-Bi solder forms a well-defined eutectic microstructure at all solidification rates, while Sn-In solder forms an irregular eutectic that changes to a fine-grained two-phase mixture at high solidification rates. Both solders wet copper by forming tin-containing intermetallics; however, Sn-In forms Sn-In-Cu intermetallics with copper and Au-In intermetallics with gold. The steady-state creep behavior of Sn-In and Sn-Bi roughly resembles that of Sn-Pb with similar microstructures. Sn-Bi further resembles Sn-Pb in that its eutectic microstructure recrystallizes within inhomogeneous shear bands. This is not observed in Sn-In. Both Sn-Bi and Sn-In exhibit pronounced strain softening during shear deformation and show early transitions to tertiary creep. Shear stress-strain behavior at normal temperatures and moderate strain rates is governed by creep; the ultimate shear stress can be inferred from the steady-state creep behavior. C1 LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. RP MORRIS, JW (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. NR 6 TC 75 Z9 76 U1 2 U2 19 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD JUL PY 1993 VL 45 IS 7 BP 25 EP 27 PG 3 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA LL540 UT WOS:A1993LL54000004 ER PT J AU HUANG, XZ MAKI, K AF HUANG, XZ MAKI, K TI IMPERFECT NESTING AND SCATTERING DUE TO DISORDER IN SPIN-DENSITY-WAVES SO JOURNAL DE PHYSIQUE IV LA English DT Article; Proceedings Paper CT INTERNATIONAL WORKSHOP ON ELECTRONIC CRYSTALS ( ECRYS 93 ) CY JUN 02-04, 1993 CL CARRY LE ROUET, FRANCE SP EUROPEAN PHYS SOC, FRENCH PHYS SOC, CNRS, MINIST RECH & ESPACE, DIRECT RECH ETUDES & TECH, UNIV JOSEPH FOURIER GRENOBLE AB As is well-known both imperfect nesting and scattering reduces the spin-density-wave transition temperature and the quasi-particle energy gap at T = 0K. We extend our earlier analysis to the condensate density f1 and the pinning potential thus the threshold field, at both T = 0K and T = T(c) when both imperfect nesting and scattering effect are present. At T = 0K, f1 = 1 in the presence of both imperfect nesting and scattering until the quasi-particle energy gap is closed. Consequently, the threshold field E(T) is almost constant until SDW is almost destroyed, where E(T) suddenly moves up. We found that E(T) exhibits a small peak just before T(c) for small scattering rates. This result may help disentangle the mechanism behind the rapid cooling of (TMTSF)2ClO4. C1 UNIV SO CALIF,DEPT PHYS,LOS ANGELES,CA 90089. RP HUANG, XZ (reprint author), LOS ALAMOS NATL LAB,T-11,MS-B262,LOS ALAMOS,NM 87545, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 1155-4339 J9 J PHYS IV JI J. Phys. IV PD JUL PY 1993 VL 3 IS C2 BP 65 EP 69 DI 10.1051/jp4:1993213 PG 5 WC Physics, Multidisciplinary SC Physics GA LY576 UT WOS:A1993LY57600014 ER PT J AU HUANG, XZ BISHOP, AR GAMMEL, GT AF HUANG, XZ BISHOP, AR GAMMEL, GT TI ELECTRONIC BAND-STRUCTURE AND RAMAN PROPERTY OF MIXED MX CHAIN - PTIXCL1-X SO JOURNAL DE PHYSIQUE IV LA English DT Article; Proceedings Paper CT INTERNATIONAL WORKSHOP ON ELECTRONIC CRYSTALS ( ECRYS 93 ) CY JUN 02-04, 1993 CL CARRY LE ROUET, FRANCE SP EUROPEAN PHYS SOC, FRENCH PHYS SOC, CNRS, MINIST RECH & ESPACE, DIRECT RECH ETUDES & TECH, UNIV JOSEPH FOURIER GRENOBLE AB We investigated theoretically the electronic and optical properties of the mixed halogen-bridged-mixed-valence-transition-metal (MX) linear chain compounds PtIxCl1-x. Similar to our earlier results for PtBrxCl1-x [1], PtIxCl1-x exhibits a segment length dependence of optical Raman spectra, but shows a different quantitative behavior. The competition between the PtI segment length and its characteristic coherence length, coupled with electron-lattice coupling results in the initial increase and then decrease of PtI Raman segment frequency as a function of its segment length. The PtI segment Raman modes and their accompanying PtCl modes have good agreement with the experimental data. A possible novel charge separation effect associated with photoexcitation (e.g. exciton) is discussed. RP HUANG, XZ (reprint author), LOS ALAMOS NATL LAB,T-11,MS-B262,LOS ALAMOS,NM 87545, USA. NR 7 TC 2 Z9 2 U1 0 U2 1 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 1155-4339 J9 J PHYS IV JI J. Phys. IV PD JUL PY 1993 VL 3 IS C2 BP 145 EP 149 DI 10.1051/jp4:1993229 PG 5 WC Physics, Multidisciplinary SC Physics GA LY576 UT WOS:A1993LY57600030 ER PT J AU DUPUIS, N MONTAMBAUX, G DEMELO, CARS AF DUPUIS, N MONTAMBAUX, G DEMELO, CARS TI QUASI-ONE-DIMENSIONAL SUPERCONDUCTORS IN STRONG MAGNETIC-FIELD SO JOURNAL DE PHYSIQUE IV LA English DT Article; Proceedings Paper CT INTERNATIONAL WORKSHOP ON ELECTRONIC CRYSTALS ( ECRYS 93 ) CY JUN 02-04, 1993 CL CARRY LE ROUET, FRANCE SP EUROPEAN PHYS SOC, FRENCH PHYS SOC, CNRS, MINIST RECH & ESPACE, DIRECT RECH ETUDES & TECH, UNIV JOSEPH FOURIER GRENOBLE AB We determine the phase diagram of a quasi-one-dimensional conductor (weakly coupled chains system with an open Fermi surface) in a magnetic field. The usual Ginzburg-Landau regime is followed, when the field is increased, by a cascade of superconducting phases separated by first order transitions, which ends with a strong reentrance of the super-conducting phase. These new phases show a novel kind of symmetry of laminar type. The Zeeman splitting does not completely suppress the reentrance in very strongfield, the ground state being in this case a Larkin-Ovchinnikov-Fulde-Ferrell state. C1 ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCOND,DIV MAT SCI,ARGONNE,IL 60439. RP DUPUIS, N (reprint author), UNIV PARIS 11,PHYS SOLIDES LAB,F-91405 ORSAY,FRANCE. NR 8 TC 1 Z9 1 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 1155-4339 J9 J PHYS IV JI J. Phys. IV PD JUL PY 1993 VL 3 IS C2 BP 311 EP 314 DI 10.1051/jp4:1993263 PG 4 WC Physics, Multidisciplinary SC Physics GA LY576 UT WOS:A1993LY57600064 ER PT J AU GELLER, AS MONDY, LA RADER, DJ INGBER, MS AF GELLER, AS MONDY, LA RADER, DJ INGBER, MS TI BOUNDARY-ELEMENT METHOD CALCULATIONS OF THE MOBILITY OF NONSPHERICAL PARTICLES .1. LINEAR-CHAINS SO JOURNAL OF AEROSOL SCIENCE LA English DT Article ID STOKES-FLOW; DYNAMIC SIMULATION; SPHERES; SMOKES; BODY AB The utility of the boundary element technique is demonstrated on the problem of linear chains of spheres translating and rotating through a quiescent fluid. The method takes advantage of the linearity of the problem by using superposition of the general solution for the flow generated by point forces on the bounding surfaces of the fluid to satisfy the boundary conditions. The HEM results for translational drag of chains of spheres compare very well with published experimental and computational data. We also show that slender body theory provides an approximate analytic result that is useful in interpreting and correlating the BEM calculations. Slender body theory also revealed that the model of the particle as a single prolate spheroid with equal aspect ratio produced a result equal to that for the chain of spheroids correct to second order, while the model of the chain as a cylinder produced an upper bound on the drag. Slender body theory also gives a reasonable estimate for the rotational resistance for chains, which, together with the BEM results, are reported here for the first time. C1 UNIV NEW MEXICO,DEPT MECH ENGN,ALBUQUERQUE,NM 87131. RP GELLER, AS (reprint author), SANDIA NATL LABS,DEPT FLUID & THERMAL SCI,ALBUQUERQUE,NM 87185, USA. NR 19 TC 13 Z9 13 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0021-8502 J9 J AEROSOL SCI JI J. Aerosol. Sci. PD JUL PY 1993 VL 24 IS 5 BP 597 EP 609 DI 10.1016/0021-8502(93)90017-4 PG 13 WC Engineering, Chemical; Engineering, Mechanical; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA LR471 UT WOS:A1993LR47100004 ER PT J AU YU, KM WALUKIEWICZ, W CHAN, LY LEON, R HALLER, EE JAKLEVIC, JM HANSON, CM AF YU, KM WALUKIEWICZ, W CHAN, LY LEON, R HALLER, EE JAKLEVIC, JM HANSON, CM TI EFFECTS OF RAPID QUENCHING ON THE IMPURITY SITE LOCATION IN ZN-DIFFUSED INP SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID P-TYPE ZNSE; LATTICE LOCATION; GALLIUM-ARSENIDE; ZINC; SEMICONDUCTORS; CRYSTALS; ACCEPTOR; LI AB The lattice locations of Zn atoms in heavily Zn-doped InP single crystal have been investigated by ion channeling techniques. The InP samples were rapidly quenched in diffusion pump oil after high-temperature Zn diffusion. Ion channeling experiments performed along various major crystal axes suggest that a large fraction (20%-30%) of the Zn atoms are in the tetrahedral interstitial position in the InP lattice. It has been found that although the maximum hole concentration is not significantly affected by the cooling rate, there is a substantial increase in the incorporation of Zn on substitutional and tetrahedral interstitial lattice locations in the rapidly cooled samples as compared to the slowly cooled samples. The consequences of these results for understanding the mechanisms leading to the saturation of the free-hole concentration in compound semiconductors are discussed. C1 USN COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,SAN DIEGO,CA 92152. RP YU, KM (reprint author), LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720, USA. RI Yu, Kin Man/J-1399-2012 OI Yu, Kin Man/0000-0003-1350-9642 NR 26 TC 26 Z9 26 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUL 1 PY 1993 VL 74 IS 1 BP 86 EP 90 DI 10.1063/1.355202 PG 5 WC Physics, Applied SC Physics GA LK469 UT WOS:A1993LK46900014 ER PT J AU STUTZIN, GC OSTROM, RM GALLAGHER, A TANENBAUM, DM AF STUTZIN, GC OSTROM, RM GALLAGHER, A TANENBAUM, DM TI NANOSCALE STUDY OF THE AS-GROWN HYDROGENATED AMORPHOUS-SILICON SURFACE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SCANNING-TUNNELING MICROSCOPY; SI-H; FILM GROWTH; PLASMA; DISCHARGE; DEPOSITION; SILANE; MICROSTRUCTURE; KINETICS; RADICALS AB A scanning tunneling microscope has been used to study the topography of the as-grown surface of device-quality, intrinsic, hydrogenated amorphous silicon deposited by rf discharge from silane. The substrates were atomically flat, oxide-free, single-crystal silicon or gallium arsenide. No evidence for island formation or nanoscale irregularities was seen in studies of 100-angstrom-thick films on either silicon or gallium arsenide. The topography of 1000- and 4000-angstrom-thick films has much variation; many regions can be characterized as ''rolling hills,'' but atomically flat areas have also been observed nearby. Generally, it appears that surface diffusion plays a role in smoothing the film topography. In most regions, the observed slopes were 10% or less from horizontal, but some steep-sided valleys, indicating incipient voids, were observed. The effect of the finite size of the scanning tunneling microscope probe tip is considered, this has an effect on the observed images in some cases. C1 UNIV COLORADO,NATL INST STAND & TECHNOL,JOINT INST LAB ASTROPHYS,BOULDER,CO 80309. NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. NR 36 TC 21 Z9 21 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUL 1 PY 1993 VL 74 IS 1 BP 91 EP 100 DI 10.1063/1.355203 PG 10 WC Physics, Applied SC Physics GA LK469 UT WOS:A1993LK46900015 ER PT J AU SPILLER, E STEARNS, D KRUMREY, M AF SPILLER, E STEARNS, D KRUMREY, M TI MULTILAYER X-RAY MIRRORS - INTERFACIAL ROUGHNESS, SCATTERING, AND IMAGE QUALITY SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID TELESCOPES; CORONA; FILMS AB Scattering of the multilayer coatings used for our normal incidence soft x-ray telescope at lambda = 63.5 angstrom has been measured at lambda = 1.54 angstrom and grazing angles of incidence and at soft x rays near normal incidence. Furthermore, the edge of the moo is used as a known test target to estimate the amount of scattering in the arcsec range from images obtained on the date of the solar eclipse on July 11, 1991. The internal surfaces of the coating -are inspected by high-resolution electron microscopy. A theoretical model describing the evolution and replication of roughness from layer to layer throughout the structure, which is in agreement with all experimental data is presented. We find that practically all roughness caused by the growth of the multilayer structure occurs at spatial frequencies which are too high to produce scattering. The substrate roughness is replicated at lower spatial frequencies which might produce scattering within the field of view of an instrument. However, roughness in this range is below the 0.5 angstrom level again resulting in insignificant amounts of scatter. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. PHYS TECH BUNDESANSTALT,W-1000 BERLIN 10,GERMANY. RP SPILLER, E (reprint author), IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598, USA. RI Krumrey, Michael/G-6295-2011 NR 35 TC 125 Z9 125 U1 1 U2 12 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 JUL 1 PY 1993 VL 74 IS 1 BP 107 EP 118 DI 10.1063/1.354140 PG 12 WC Physics, Applied SC Physics GA LK469 UT WOS:A1993LK46900017 ER PT J AU BENGUIGUI, L WEIL, R MURANEVICH, E CHACK, A FREDJ, E ZUNGER, A AF BENGUIGUI, L WEIL, R MURANEVICH, E CHACK, A FREDJ, E ZUNGER, A TI FERROELECTRIC PROPERTIES OF CD1-XZNX TE SOLID-SOLUTIONS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SEMICONDUCTOR ALLOYS; CUCL; DENSITY; STATES AB Measurements of the spontaneous polarization P, x-ray diffraction, birefringence, dielectric constant at different frequencies, and specific heat C(p) of the Cd0.9Zn0.1Te alloy are presented. The results demonstrate that this system exhibits a diffuse, second-order ferroelectric transition. The transition is of order-disorder type as deduced from the dielectric measurements. It is found that: (a) The birefringence is proportional to P, as expected from a system with a piezoelectric paraelectric phase; (b) the heat capacity is given by C(p)= (T(c)/C)\(PdP/dT)\, where C is the Curie constant. One of the main phenomena observed in these solid solutions is the instability of the ferroelectric phase: Once the neighborhood of the transition temperature is reached, the transition disappears upon subsequent cooling. A hypothesis for this instability is offered in terms of a two-state configuration-coordinate diagram. C1 TECHNION ISRAEL INST TECHNOL,DEPT PHYS,IL-32000 HAIFA,ISRAEL. NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP BENGUIGUI, L (reprint author), TECHNION ISRAEL INST TECHNOL,INST SOLID STATE,IL-32000 HAIFA,ISRAEL. RI Zunger, Alex/A-6733-2013 NR 27 TC 22 Z9 23 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUL 1 PY 1993 VL 74 IS 1 BP 513 EP 520 DI 10.1063/1.355262 PG 8 WC Physics, Applied SC Physics GA LK469 UT WOS:A1993LK46900079 ER PT J AU FRAGALLI, JF MISOGUTI, L NAKAGAITO, AN GRIVICKAS, V BAGNATO, VS BRANZ, HM AF FRAGALLI, JF MISOGUTI, L NAKAGAITO, AN GRIVICKAS, V BAGNATO, VS BRANZ, HM TI HYDROGENATED AMORPHOUS-SILICON FILMS BY 60 HZ GLOW-DISCHARGE DEPOSITION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID A-SI-H; FREQUENCY; TRANSPORT; PLASMA AB We deposit hydrogenated amorphous silicon (a-Si:H) in a low-frequency (60 Hz) glow-discharge deposition system. The films show electronic and optical properties nearly equivalent to those of films produced by the conventional radio-frequency (13.56-MHz) glow-discharge technique. The optimal substrate temperature for the low-frequency glow-discharge technique is 150-170-degrees-C, about 100-degrees-C lower than at radio frequency. We report measurements of film properties including dark conductivity, photoconductivity, ambipolar diffusion length, infrared absorption, optical band gap, and deep defect density. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP FRAGALLI, JF (reprint author), USP,INST FIS & QUIM SAO CARLOS,CAIXA POSTAL 369,BR-13560-970 SAO CARLOS,SP,BRAZIL. RI Misoguti, Lino/C-2462-2012; Bagnato, Vanderlei/C-3133-2012 OI Misoguti, Lino/0000-0001-6624-8453; NR 18 TC 3 Z9 3 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUL 1 PY 1993 VL 74 IS 1 BP 668 EP 671 DI 10.1063/1.355228 PG 4 WC Physics, Applied SC Physics GA LK469 UT WOS:A1993LK46900099 ER PT J AU HERSHCOVITCH, A AF HERSHCOVITCH, A TI OBSERVATION OF A VERY HIGH ELECTRON CURRENT EXTRACTION MODE IN A HOLLOW-CATHODE DISCHARGE SO JOURNAL OF APPLIED PHYSICS LA English DT Note AB Earlier results by Hershcovitch, Kovarik, and Prelec in J. Appl. Phys. 67, 671 (1990) proved that, in a low-pressure operating mode, hollow cathode discharges can have a two-component electron population, one of which is that of ''fast'' electrons having an energy corresponding to the cathode potential and a thermal spread of about 0.13 eV, which could form a basis for an excellent electron gun. Investigations of extracted electron currents in this low pressure mode indicate the existence of a narrow pressure range characterized by very high electron current extraction. RP HERSHCOVITCH, A (reprint author), ASSOC UNIV INC,BROOKHAVEN NATL LAB,DEPT AGS,UPTON,NY 11973, USA. NR 4 TC 10 Z9 10 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUL 1 PY 1993 VL 74 IS 1 BP 728 EP 729 DI 10.1063/1.355239 PG 2 WC Physics, Applied SC Physics GA LK469 UT WOS:A1993LK46900109 ER PT J AU CLARKE, DB SUZUKI, I BELL, AT AF CLARKE, DB SUZUKI, I BELL, AT TI AN INFRARED STUDY OF THE INTERACTIONS OF CO AND CO2 WITH CU/SIO2 SO JOURNAL OF CATALYSIS LA English DT Article ID SUPPORTED COPPER-CATALYSTS; ION-EXCHANGE TECHNIQUE; CARBON-MONOXIDE; METHANOL SYNTHESIS; ADSORPTION; SURFACE; CU(100); CHEMISORPTION; SPECTROSCOPY; OXIDATION C1 UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. RP CLARKE, DB (reprint author), LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720, USA. OI Bell, Alexis/0000-0002-5738-4645 NR 45 TC 37 Z9 37 U1 0 U2 10 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 JUL PY 1993 VL 142 IS 1 BP 27 EP 36 DI 10.1006/jcat.1993.1186 PG 10 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA LJ359 UT WOS:A1993LJ35900003 ER PT J AU LAHTINEN, J ANRAKU, T SOMORJAI, GA AF LAHTINEN, J ANRAKU, T SOMORJAI, GA TI CARBON-MONOXIDE HYDROGENATION ON COBALT FOIL AND ON THIN COBALT FILM MODEL CATALYSTS SO JOURNAL OF CATALYSIS LA English DT Article ID FISCHER-TROPSCH REACTION; SINGLE-CRYSTAL NICKEL; CO HYDROGENATION; PRODUCT DISTRIBUTION; SURFACE-COMPOSITION; STRUCTURE SENSITIVITY; TRANSITION-METALS; METHANATION; KINETICS; IRON C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI Lahtinen, Jouko/K-6804-2012 OI Lahtinen, Jouko/0000-0002-1192-9945 NR 41 TC 31 Z9 31 U1 1 U2 7 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 JUL PY 1993 VL 142 IS 1 BP 206 EP 225 DI 10.1006/jcat.1993.1202 PG 20 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA LJ359 UT WOS:A1993LJ35900019 ER PT J AU PALMER, DA SIMONSON, JM AF PALMER, DA SIMONSON, JM TI VOLATILITY OF AMMONIUM-CHLORIDE OVER AQUEOUS-SOLUTIONS TO HIGH-TEMPERATURES SO JOURNAL OF CHEMICAL AND ENGINEERING DATA LA English DT Article ID THERMODYNAMIC PROPERTIES; HYDROCHLORIC-ACID; SODIUM-CHLORIDE; IONIZATION; ENTHALPY; DILUTION; ELECTROLYTES; EQUILIBRIA AB The partitioning of ammonium chloride from aqueous solutions to the vapor phase was measured from 120 to 350-degrees-C. The experiments were performed in a platinum-lined autoclave from which samples of the liquid and vapor phases were withdrawn for analysis by ion chromatography, and acidimetric titration. The liquid-phase pH was maintained either with an excess of hydrochloric acid or by excess ammonia in the ammonium chloride solutions. The molal thermodynamic partitioning constants for NH4Cl were calculated from the observed liquid- and vapor-phase concentrations, taking into account the known partitioning coefficients of HCl and NH3, as well as the known mean stoichiometric activity coefficients of the ionic species in the liquid phase. The partitioning constants for NH4Cl, NH3, and HCl are represented as simple functions of temperature and water density. Some discussion is given of the relevance of these results to modeling the transport of chloride in power plants using ammonia to control the pH of the water/steam cycle. RP PALMER, DA (reprint author), OAK RIDGE NATL LAB,DIV CHEM,POB 2008,OAK RIDGE,TN 37831, USA. NR 27 TC 7 Z9 7 U1 1 U2 10 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 JUL PY 1993 VL 38 IS 3 BP 465 EP 474 DI 10.1021/je00011a036 PG 10 WC Thermodynamics; Chemistry, Multidisciplinary; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA LV461 UT WOS:A1993LV46100036 ER PT J AU BELL, SE MEAD, WC JONES, RD EICEMAN, GA EWING, RG AF BELL, SE MEAD, WC JONES, RD EICEMAN, GA EWING, RG TI CONNECTIONIST HYPERPRISM NEURAL-NETWORK FOR THE ANALYSIS OF ION MOBILITY SPECTRA - AN EMPIRICAL-EVALUATION SO JOURNAL OF CHEMICAL INFORMATION AND COMPUTER SCIENCES LA English DT Article ID PLASMA CHROMATOGRAPHY; SPECTROMETRY; GAS AB Spectra from ion mobility spectrometry (IMS) consist of low resolution information arising from complex gas-phase ion-molecular reactions. Such spectra lack specific structural information and have been considered inappropriate for analysis by traditional library search and pattern recognition methods. A data set of 292 mobility spectra from 12 organic compounds was treated using a connectionist hyperprism classification (CHC) neural network. Advantages of the CHC network for such spectra included high speed, linear training, and flexibility to adapt training parameters, to minimize false negative identifications. The principal disadvantages were a sensitivity to unnecessary spectral information in the training vectors and a high false positive ratio. However, sensitivity exhibited by the CHC neural network assisted in identifying dispensable spectral information and in suggesting the importance of spectral features. C1 LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RP BELL, SE (reprint author), NEW MEXICO STATE UNIV, DEPT CHEM & BIOCHEM, LAS CRUCES, NM 88003 USA. NR 26 TC 13 Z9 13 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0095-2338 J9 J CHEM INF COMP SCI JI J. Chem. Inf. Comput. Sci. PD JUL-AUG PY 1993 VL 33 IS 4 BP 609 EP 615 DI 10.1021/ci00014a014 PG 7 WC Chemistry, Multidisciplinary; Computer Science, Information Systems; Computer Science, Interdisciplinary Applications SC Chemistry; Computer Science GA LT185 UT WOS:A1993LT18500015 ER PT J AU CHANG, YJ CASTNER, EW AF CHANG, YJ CASTNER, EW TI FEMTOSECOND DYNAMICS OF HYDROGEN-BONDING SOLVENTS - FORMAMIDE AND N-METHYLFORMAMIDE IN ACETONITRILE, DMF, AND WATER SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ROTATIONAL FRICTION COEFFICIENTS; LIQUID FORMAMIDE; SOLVATION DYNAMICS; OPTICAL KERR; BOUNDARY-CONDITION; RAMAN; SPECTROSCOPY; DIFFRACTION; RELAXATION; RESPONSES AB We have used optical-heterodyne-detected optical Kerr effect (OHD-OKE) spectroscopy to measure the ultrafast dynamical profile of the amide series formamide (FA), N-methylformamide (NMF), and N,N-dimethylformamide (DMF). We have studied the concentration dependence of binary solutions of FA and NMF using DMF, water, and acetonitrile as cosolvents. Our results show an underdamped librational motion with a period of about 100 cm-1 in both FA and NMF, which also occurs in the binary solutions. The significance of these results for ultrafast chemical reactions in solution is discussed. RP BROOKHAVEN NATL LAB, DEPT CHEM, BLDG 555A, UPTON, NY 11973 USA. NR 50 TC 183 Z9 184 U1 3 U2 23 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD JUL 1 PY 1993 VL 99 IS 1 BP 113 EP 125 DI 10.1063/1.465790 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LJ308 UT WOS:A1993LJ30800013 ER PT J AU YEN, MW JOHNSON, PM WHITE, MG AF YEN, MW JOHNSON, PM WHITE, MG TI THE VACUUM-ULTRAVIOLET PHOTODISSOCIATION OF THE CHLOROFLUOROCARBONS - PHOTOLYSIS OF CF3CL, CF2CL2, AND CFCL3 AT 187, 125, AND 118 NM SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ENHANCED MULTIPHOTON IONIZATION; EMISSION-SPECTRA; ABSORPTION-SPECTRA; 193 NM; CHLOROFLUOROMETHANES; RADICALS; DISSOCIATION; SPECTROSCOPY; MOLECULES; CF3BR AB Photofragmentation of the chlorofluorocarbons, CF3Cl, CF2Cl2, and CFCl3, was investigated at 187, 125, and 118 nm using VUV harmonic generation techniques and (2 + 1) resonantly enhanced multiphoton ionization detection of ground Cl(2P3/2(0)) and excited Cl*(2P(1/2)0 ) state fragment atoms. Product translational energy and angular distributions were derived from Cl+ arrival time distributions obtained by time-of-flight mass spectrometry. Photolysis of CF3Cl at 125 and 118 nm takes place via the 4s(a1) and 4p(e) Rydberg states, respectively, and two primary fragmentation channels are observed. A ''slow'' channel with a most probable center-of-mass (c.m.) translational energy near zero is assigned to the production CF3* radicals in the 2A1', 2A2'', and 1E' electronically excited states. The second Cl/Cl* fragmentation channel has a c.m. translational energy distribution peaked at E(tr) greater-than-or-equal-to 1 eV and is tentatively assigned to a sequential dissociation process in which rapid C-Cl single bond rupture is followed by a secondary fragmentation of CF3* to CF2+F. The time-of-flight (TOF) spectra for CF2Cl2 and CFCl3 following excitation at 125 and 118 nm suggest that concerted three-body fragmentation involving the loss of two Cl/Cl* atoms is the dominant dissociation process. By contrast, photolysis of CF2Cl2 and CFCl3 at 187 nm results in structured Cl+ arrival time distributions which are used to derive translational energy distributions and asymmetry parameters. Simulations of the TOF spectra suggest the presence of three Cl/Cl* fragment channels, with the highest energy channel clearly attributable to single C-Cl bond rupture leading to internally excited molecular fragments. The contribution of sequential and simultaneous two-Cl loss processes to the low translational energy channels is also discussed. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. SUNY,DEPT CHEM,STONY BROOK,NY 11794. NR 28 TC 27 Z9 27 U1 1 U2 11 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUL 1 PY 1993 VL 99 IS 1 BP 126 EP 139 DI 10.1063/1.465791 PG 14 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LJ308 UT WOS:A1993LJ30800014 ER PT J AU HO, J ZHU, L PARKS, EK RILEY, SJ AF HO, J ZHU, L PARKS, EK RILEY, SJ TI TEMPERATURE-DEPENDENCE OF THE REACTIONS OF SMALL COBALT CLUSTERS WITH DEUTERIUM SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID TRANSITION-METAL CLUSTERS; HYDROGEN CHEMISORPTION; IRON CLUSTERS; NIOBIUM CLUSTERS; KINETICS; H-2; REACTIVITY; SURFACES; IONS AB The kinetics of the reactions of cobalt clusters (Co(n), n = 9-2 1 ) with deuterium are studied over the temperature range 133-373 K. The measured rate constants for the dissociative addition of the first D2 molecule to Co(n), and their temperature dependences, are found to be strongly dependent on cluster size. Co10-13 and Co15-17 are relatively reactive, with their reaction rates essentially independent of temperature, suggesting no significant reaction barrier for deuterium chemisorption. The reaction rate of Co20 is nearly constant above 213 K, but increases at lower temperature. For Co9 and Co14, the rate constants increase both at high and low temperatures. An increase at higher temperatures suggests the presence of activation barriers, while increases at low temperatures are interpreted as due to an increase in the initial trapping of D2 onto the clusters' surfaces. For Co18, Co19, and Co21, evidence for more than one isomer at low temperature is found. The experimental results are discussed in terms of cluster geometrical structure and the detailed reaction mechanism. RP HO, J (reprint author), ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. NR 37 TC 41 Z9 42 U1 1 U2 4 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUL 1 PY 1993 VL 99 IS 1 BP 140 EP 147 DI 10.1063/1.465793 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LJ308 UT WOS:A1993LJ30800015 ER PT J AU PETERSON, KA WERNER, HJ AF PETERSON, KA WERNER, HJ TI A MULTIREFERENCE CONFIGURATION-INTERACTION STUDY OF THE LOW-LYING ELECTRONIC STATES OF CLO2(+) AND THE X(1)A(1) STATE OF CLO2(-) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CHLORINE DIOXIDE; SCF METHOD; MOLECULE AB Near-equilibrium two-dimensional (C2v symmetry) potential energy functions of the first seven electronic states of ClO2+ and the ground X 1A1 electronic state of ClO2- have been calculated using internally contracted multireference configuration interaction (CMRCI) wave functions. In the case of ClO2+, five electronic states (B-3(2), 3A2, 1A2, B-3(1), and B-1(1)) are predicted to lie within 3 eV of the X 1A1 ground state, while a B-1(2) State has a calculated T(e) of just over 5 eV. In the X state, the equilibrium geometry is calculated by CMRCI to be r(e) = 1.423 angstrom and theta(e) = 120.8-degrees. Harmonic vibrational frequencies of 1012 (omega1), 511 (omega2), and 1283 cm-1 (omega3) were derived from the computed potential energy function, and omega1 and omega2 were found to be in good agreement with the values estimated from the photoelectron speCtruM of ClO2. For the X 1A1 state of ClO2-, calculated spectroscopic constants include r(e) = 1.573 angstrom, theta(e) =113.9-degrees, omega1 = 789 cm-1, omega2 = 378 cm-1, and omega3 = 848 cm . Electric dipole moment functions have also been derived for both species in their electronic ground states. The calculated equilibrium dipole moments for ClO2+ and ClO2- 1.46 and 2.55 D, respectively, make them good candidates for observation by pure rotational spectroscopy. Within the double harmonic approximation, fundamental infrared intensities have also been derived, and these results predict a relatively intense infrared vibrational spectrum in the nu3 mode of ClO2-. C1 UNIV BIELEFELD, FAK CHEM, W-4800 BIELEFELD, GERMANY. RP PETERSON, KA (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RI Werner, Hans-Joachim/G-9509-2011 OI Werner, Hans-Joachim/0000-0002-0435-539X NR 37 TC 26 Z9 26 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUL 1 PY 1993 VL 99 IS 1 BP 302 EP 307 DI 10.1063/1.465808 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LJ308 UT WOS:A1993LJ30800033 ER PT J AU ERIKSON, RL EARY, LE HOSTETLER, CJ AF ERIKSON, RL EARY, LE HOSTETLER, CJ TI ENERGETICS, STRUCTURE, AND COMPRESSIBILITY OF NAF DETERMINED BY THE PERIODIC HARTREE-FOCK METHOD SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ELECTRONIC-STRUCTURE; ELASTIC-CONSTANTS; ALPHA-QUARTZ; BASIS-SETS; ABINITIO; NACL; SEMICONDUCTORS; CRYSTAL; SURFACES; PHASES AB Basis set development methods for molecular cluster calculations were used to develop basis sets for periodic ab initio calculations of the energy-dependent properties of ionic crystals. Two extended, Gaussian basis sets for closed-shell sodium and fluorine ions were developed to compare with two minimal basis sets in calculating the crystal structures, enthalpies of formation, and high-pressure compression behavior of the B1 and B2 phases of NaF. Accurate calculation of the energy-dependent properties to within experimental error required the use of the larger, extended basis sets. Enthalpies of formation for NaF-B1 at 0 K and 1 bar were calculated to be between - 921 and - 929 kJ/mol, which agrees well with an experimental value ( - 927 +/- 10 kJ/mol) estimated from calorimetric data. For the B1 phase, the zero-pressure bulk modulus was calculated to be between 0.485 and 0.499 Mbar, as compared to the measured value of 0.464 +/- 0.062 Mbar. The calculated molar volume at zero pressure agrees to within 0.1% of the experimental value. For the B2 phase, the zero-pressure bulk modulus was nearly the same as that for the B1 phase, ranging from 0.494 to 0.517 Mbar. However, this calculated bulk modulus for the B2 phase was considerably smaller than the experimental value of 1.03 +/- 0.19 Mbar estimated from high-pressure compression measurements. Our calculations also suggest the V02/V01 of the B2 phase is nearer to 0.871-0.895 than to the experimental estimate of 0.81 1. The compression curves for both phases agreed, for the most part, with the experimental data to within the experimental error. The calculated pressure for the NaF B1/B2 transition is between 0.26 and 0.29 Mbar, slightly higher than the averaged experimental value (0.23 +/- 0.03 Mbar) but within a pressure range where both phases metastably coexist along the compression curve. The calculated volume change accompanying the phase transition ( - 10.1%) is in good agreement with experimental data (- 10.4%). The apparent discrepancies between the zero-pressure bulk modulus and the compression curves of the B2 phase are shown to be related to the range of molar volumes used in deriving the zero-pressure properties from an equation of state. RP ERIKSON, RL (reprint author), PACIFIC NW LAB, CTR EARTH & ENVIRONM SCI, POB 999,MS K681, RICHLAND, WA 99352 USA. NR 38 TC 10 Z9 10 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 JUL 1 PY 1993 VL 99 IS 1 BP 336 EP 344 DI 10.1063/1.465811 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LJ308 UT WOS:A1993LJ30800036 ER PT J AU LONDONO, JD SHAH, VM WIGNALL, GD COCHRAN, HD BIENKOWSKI, PR AF LONDONO, JD SHAH, VM WIGNALL, GD COCHRAN, HD BIENKOWSKI, PR TI SMALL-ANGLE NEUTRON-SCATTERING STUDIES OF DILUTE SUPERCRITICAL SOLUTIONS .1. PURE SUPERCRITICAL NEON SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MIXTURES; SOLVENT; KRYPTON; FLUIDS AB Small angle neutron scattering (SANS) results are presented for states of neon close to the critical isochore and supercritical temperatures between 47 and 60 K. The net intensities were converted to absolute units of differential cross section per unit sample volume by comparison with precalibrated secondary standards. The values of the differential cross section at zero scattering vector are in excellent agreement with values calculated from an equation of state. Evidence of three-body forces in these data are compared to that present in Krypton data reported earlier. It is concluded that small angle experiments of the sort reported here should be repeated for the heavier noble gases, for which effects from three-body forces are anticipated to be larger. C1 OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. OAK RIDGE NATL LAB, DIV CHEM TECHNOL, OAK RIDGE, TN 37831 USA. RP UNIV TENNESSEE, DEPT CHEM ENGN, KNOXVILLE, TN 37996 USA. NR 24 TC 23 Z9 23 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD JUL 1 PY 1993 VL 99 IS 1 BP 466 EP 470 DI 10.1063/1.465770 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LJ308 UT WOS:A1993LJ30800049 ER PT J AU RARD, JA AF RARD, JA TI ON THE OSMOTIC AND ACTIVITY-COEFFICIENTS OF NA2WO4(AQ) AND NA2MOO4(AQ) AT THE TEMPERATURE 298.15-K, AND THE RELATIONS BETWEEN MEAN ACTIVITY-COEFFICIENTS OF SOLUTES UNDER ISOPIESTIC CONDITIONS SO JOURNAL OF CHEMICAL THERMODYNAMICS LA English DT Article ID 25-DEGREES-C; ELECTROLYTES; CHLORIDE RP RARD, JA (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV EARTH SCI,LIVERMORE,CA 94550, USA. NR 42 TC 5 Z9 5 U1 0 U2 1 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0021-9614 J9 J CHEM THERMODYN JI J. Chem. Thermodyn. PD JUL PY 1993 VL 25 IS 7 BP 887 EP 904 DI 10.1006/jcht.1993.1086 PG 18 WC Thermodynamics; Chemistry, Physical SC Thermodynamics; Chemistry GA LK401 UT WOS:A1993LK40100010 ER PT J AU BRICKELL, E SAKS, M AF BRICKELL, E SAKS, M TI THE NUMBER OF DISTINCT SUBSET SUMS OF A FINITE-SET OF VECTORS SO JOURNAL OF COMBINATORIAL THEORY SERIES A LA English DT Article C1 RUTGERS UNIV,DEPT MATH,NEW BRUNSWICK,NJ 08903. UNIV CALIF SAN DIEGO,DEPT COMP SCI & ENGN,LA JOLLA,CA 92093. RP BRICKELL, E (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 2 TC 0 Z9 0 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 0097-3165 J9 J COMB THEORY A JI J. Comb. Theory Ser. A PD JUL PY 1993 VL 63 IS 2 BP 234 EP 256 DI 10.1016/0097-3165(93)90059-H PG 23 WC Mathematics SC Mathematics GA LJ173 UT WOS:A1993LJ17300005 ER PT J AU FEYEREISEN, MW KENDALL, RA NICHOLS, J DAME, D GOLAB, JT AF FEYEREISEN, MW KENDALL, RA NICHOLS, J DAME, D GOLAB, JT TI IMPLEMENTATION OF THE DIRECT SCF AND RPA METHODS ON LOOSELY-COUPLED NETWORKS OF WORKSTATIONS SO JOURNAL OF COMPUTATIONAL CHEMISTRY LA English DT Article ID COMPUTERS AB The use of a cluster of workstations as an alternative supercomputer resource is demonstrated using the ab initio direct SCF and RPA code DISCO. DISCO was implemented using several different mechanisms to achieve the requisite parallelization. The various parallel software mechanisms are characterized based upon several different criteria, including portability, ease of use, and relative efficiency. The application of direct SCF and RPA techniques to study the static polarizability of paranitroaniline is described. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. UNIV UTAH, IBM CORP, UTAH SUPERCOMP INST, SALT LAKE CITY, UT 84112 USA. UNIV ILLINOIS, NATL CTR SUPERCOMP APPLICAT, BECKMAN INST ADV SCI & TECHNOL, URBANA, IL 61801 USA. OI Nichols, Jeffrey/0000-0001-5454-9726 NR 16 TC 25 Z9 25 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0192-8651 J9 J COMPUT CHEM JI J. Comput. Chem. PD JUL PY 1993 VL 14 IS 7 BP 818 EP 830 DI 10.1002/jcc.540140708 PG 13 WC Chemistry, Multidisciplinary SC Chemistry GA LH164 UT WOS:A1993LH16400007 ER PT J AU CHORIN, AJ AF CHORIN, AJ TI HAIRPIN REMOVAL IN VORTEX INTERACTIONS .2. SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID TURBULENT VORTEX; CONVERGENCE; EQUATIONS; FILAMENT; DYNAMICS; MODEL RP CHORIN, AJ (reprint author), LAWRENCE BERKELEY LAB,DEPT MATH,BERKELEY,CA 94720, USA. NR 37 TC 30 Z9 30 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 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD JUL PY 1993 VL 107 IS 1 BP 1 EP 9 DI 10.1006/jcph.1993.1120 PG 9 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA LK455 UT WOS:A1993LK45500001 ER PT J AU SCHULTZ, JC KLAUSMEIERBROWN, ME RISTOW, ML PARTAIN, LD ALJASSIM, MM JONES, KM AF SCHULTZ, JC KLAUSMEIERBROWN, ME RISTOW, ML PARTAIN, LD ALJASSIM, MM JONES, KM TI DEVELOPMENT OF HIGH-QUANTUM-EFFICIENCY, LATTICE-MISMATCHED, 1.0-EV GAINAS SOLAR-CELLS SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE ALGAINAS; GAINAS; LATTICE MISMATCH; OMVPE; QUANTUM EFFICIENCY; SOLAR CELL ID VAPOR-PHASE EPITAXY; GAAS; DEVICES AB High-quantum-efficiency, lattice-mismatched, 1.0-eV GaInAs solar cells grown by organometallic vapor phase epitaxy have been developed for ultimate integration into AlGaAs/GaAs/GaInAs 3-junction, 2-terminal monolithic devices. The more standard n/p junction was replaced with an n-i-p structure in the GaInAs cell in order to increase the short-circuit current by overcoming the material deficiencies which arise as a result of accommodating the lattice mismatch. This led to single junction 1.0-eV GaInAs cells with internal quantum efficiencies >90% and short-circuit-current densities that match or closely approach those needed to current match the upper AlGaAs and GaAs cells. A 4. 1% (1-sun, air mass 0, 25-degrees-C) power conversion efficiency was achieved with a developmental structure, indicating the potential of the lattice-mismatched n-i-p 1.0-eV GaInAs cell. An analogous device designed to allow direct monolithic integration with the upper AlGaAs and GaAs cells, with a modified grading layer of GaInAs in place of the usual GaInAs, achieved an efficiency of 2.2%, primarily due to a lower open-circuit voltage. The open-circuit voltage is perhaps limited by structural defects revealed in transmission electron micrographs. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP SCHULTZ, JC (reprint author), VARIAN ASSOCIATES INC,EDWARD L GINZTON RES CTR,3075 HANSEN WAY,PALO ALTO,CA 94303, USA. NR 25 TC 3 Z9 3 U1 0 U2 2 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD JUL PY 1993 VL 22 IS 7 BP 755 EP 761 DI 10.1007/BF02817351 PG 7 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA LL381 UT WOS:A1993LL38100007 ER PT J AU MICKLOW, GJ ROYCHOUDHURY, S NGUYEN, HL CLINE, MC AF MICKLOW, GJ ROYCHOUDHURY, S NGUYEN, HL CLINE, MC TI EMISSIONS REDUCTION BY VARYING THE SWIRLER AIR-FLOW SPLIT IN ADVANCED GAS-TURBINE COMBUSTORS SO JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME LA English DT Article; Proceedings Paper CT 37TH INTERNATIONAL GAS TURBINE AND AEROENGINE CONGRESS AND EXPOSITION CY JUN 01-04, 1992 CL COLOGNE, GERMANY AB A staged combustor concept for reducing pollutant emissions is currently under investigation. A numerical study was performed to investigate the chemically reactive flow with liquid spray injection for staged combustion. The staged combustor consists of an airblast atomizer fuel injector, a rich burn section, a converging connecting pipe, a quick mix zone, a diverging connecting pipe and a lean combustion zone. For computational efficiency, the combustor was split into two subsystems, i.e., the fuel nozzle/rich burn section and the quick mix/lean burn section. The current study investigates the effect of varying the mass flow rate split between the swirler passages for an equivalence ratio of 2.0 on fuel distribution, temperature distribution, and emissions for the fuel nozzle/rich burn section of a staged combustor. It is seen that optimizing these parameters can substantially improve combustor performance and reduce combustor emissions. The optimal mass flow rate split for reducing NO(x), emissions based on the numerical study was the same as found by experiment. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,CA. NASA,LEWIS RES CTR,CLEVELAND,OH 44155. RP MICKLOW, GJ (reprint author), UNIV FLORIDA,DEPT MECH ENGN,COMPUTAT FLUID DYNAM LAB,GAINESVILLE,FL 32601, USA. NR 23 TC 9 Z9 9 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0742-4795 J9 J ENG GAS TURB POWER JI J. Eng. Gas. Turbines Power-Trans. ASME PD JUL PY 1993 VL 115 IS 3 BP 563 EP 569 DI 10.1115/1.2906744 PG 7 WC Engineering, Mechanical SC Engineering GA LP656 UT WOS:A1993LP65600018 ER PT J AU FAIN, DE ROETTGER, GE AF FAIN, DE ROETTGER, GE TI COAL-GAS CLEANING AND PURIFICATION WITH INORGANIC MEMBRANES SO JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME LA English DT Article; Proceedings Paper CT 37TH INTERNATIONAL GAS TURBINE AND AEROENGINE CONGRESS AND EXPOSITION CY JUN 01-04, 1992 CL COLOGNE, GERMANY AB The economic viability of coal gasification could depend on the ability to clean and purify the coal gases at elevated temperatures. Inorganic membranes have the potential for being used for that purpose. Efforts have been undertaken at the Oak Ridge K-25 Site to develop membranes that would be useful for separating hydrogen from the coal gas at the high operating temperatures. This paper will give a brief review of some fundamentals of gas separation with membranes. Also, a brief discussion of the theory derived to guide the development process will be given. The theory can be used to indicate the pore size needed to achieve good separation. In addition, some experimental results that have been obtained with some of the membranes that have been fabricated will be discussed. RP FAIN, DE (reprint author), MARTIN MARIETTA ENERGY SYST INC,OAK RIDGE K-25 SITE,OAK RIDGE,TN 37831, USA. NR 8 TC 4 Z9 4 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0742-4795 J9 J ENG GAS TURB POWER JI J. Eng. Gas. Turbines Power-Trans. ASME PD JUL PY 1993 VL 115 IS 3 BP 628 EP 633 DI 10.1115/1.2906752 PG 6 WC Engineering, Mechanical SC Engineering GA LP656 UT WOS:A1993LP65600026 ER PT J AU DAUSKARDT, RH AF DAUSKARDT, RH TI CYCLIC FATIGUE-CRACK GROWTH IN GRAIN BRIDGING CERAMICS SO JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON MICROMECHANICS OF CERAMICS AND CERAMIC COMPOSITES / 1992 ANNUAL MEETING OF THE AMERICAN SOC OF MECHANICAL ENGINEERS CY NOV 08-13, 1992 CL ANAHEIM, CA SP AMER SOC MECH ENGINEERS ID FRACTURE-RESISTANCE MECHANISM; ALUMINA; PROPAGATION; TOUGHNESS; BEHAVIOR AB Cyclic fatigue degradation is contemplated in polycrystalline ceramics exhibiting grain bridging as the principle toughening mechanism. A frictional-wear mechanism based on repetitive sliding wear degradation of frictional grain bridges is discussed. A micromechanical model is developed which provides an insight into the effects of salient mechanical and microstructural variables such as wear rate at the grain/matrix interface and initial residual stress of bridging grains, on fatigue-crack growth behavior. Results of the analysis are compared to experimentally observed fatigue-crack growth rates in coarse grained alumina and silicon nitride. C1 UNIV CALIF SAN FRANCISCO,HASTINGS COLL LAW,DEPT MAT SCI & MINERAL ENGN,SAN FRANCISCO,CA 94102. RP DAUSKARDT, RH (reprint author), LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 36 TC 9 Z9 9 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 JUL PY 1993 VL 115 IS 3 BP 244 EP 251 DI 10.1115/1.2904214 PG 8 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA LN819 UT WOS:A1993LN81900004 ER PT J AU OLINS, DE OLINS, AL AF OLINS, DE OLINS, AL TI INHIBITION OF DNA-SYNTHESIS IN THE MACRONUCLEAR REPLICATION BAND OF EUPLOTES-EURYSTOMUS SO JOURNAL OF EUKARYOTIC MICROBIOLOGY LA English DT Article DE AUTORADIOGRAPHY; ELECTRON MICROSCOPY; IN-SITU HYBRIDIZATION ID CELL-CYCLE; NUCLEAR MATRIX; SACCHAROMYCES-CEREVISIAE; STYLONYCHIA-MYTILUS; HEAT-SHOCK; CHROMATIN; SITES; CHROMOSOME; ALPHA; GENE AB The replication band is a large, migrating, macronuclear domain that is the site of DNA synthesis in hypotrichous ciliated protozoa. A number of agents that produce inactivation of this structure and its replicational activity are described here. These agents include heat shock, aphidicolin, cell crowding, various cAMP phosphodiesterase inhibitors and a calmodulin inhibitor. With the exception of aphidicolin, which has a direct inhibitory effect upon DNA polymerases, the mechanisms of inactivation are presently unknown. The inactivating properties of cAMP phosphodiesterase inhibitors suggest that intracellular cAMP levels may influence replication band structure and function. C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. RP OLINS, DE (reprint author), UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,POB 2009,OAK RIDGE,TN 37831, USA. NR 50 TC 8 Z9 8 U1 0 U2 0 PU SOC PROTOZOOLOGISTS PI LAWRENCE PA 810 E 10TH ST, LAWRENCE, KS 66044 SN 1066-5234 J9 J EUKARYOT MICROBIOL JI J. Eukaryot. Microbiol. PD JUL-AUG PY 1993 VL 40 IS 4 BP 459 EP 467 DI 10.1111/j.1550-7408.1993.tb04939.x PG 9 WC Microbiology SC Microbiology GA LP013 UT WOS:A1993LP01300006 ER PT J AU MCKONE, TE AF MCKONE, TE TI LINKING A PBPK MODEL FOR CHLOROFORM WITH MEASURED BREATH CONCENTRATIONS IN SHOWERS - IMPLICATIONS FOR DERMAL EXPOSURE MODELS SO JOURNAL OF EXPOSURE ANALYSIS AND ENVIRONMENTAL EPIDEMIOLOGY LA English DT Article AB Four issues are addressed in this paper. First, both dermal uptake models and a revised PBPK model are developed and combined into a form appropriate fbr simulating chloroform breath levels in individuals exposed in showers by inhalation and dermal routes and by the inhalation route only. Second, experimentally measured and previously reported ratios of chloroform concentrations in air and breath to tap-water concentration are used to evaluate the model predictions. Particular attention is given to the implied dermal uptake as measured by these experiments and to whether this is consistent with the recommended value for skin uptake of chloroform that is calculated using EPA guidance. This analysis indicates that the ratio of chloroform dermally absorbed in the shower relative to tap-water concentration is between 0.25 and 0.66 mg per mg/L and that the effective permeability of the skin during a 10-min. shower exposure is between 0.16 and 0.42 cm/hr. Third, the model is used to assess the relationship of dermal and inhalation exposure to metabolized dose in the liver. It is found that, for dermal and inhalation exposures in the shower and under conditions of linear metabolism, the ratio of metabolized dose to water concentration is on the order of 0.41 mg per mg/L. Fourth, the model is used to determine the chloroform concentration at which dermal and inhalation exposures to chloroform would begin to result in nonlinear metabolism. This concentration is found to be in the range of 60 to 100 mg/L. RP MCKONE, TE (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-453,LIVERMORE,CA 94551, USA. NR 0 TC 52 Z9 53 U1 1 U2 2 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 JUL-SEP PY 1993 VL 3 IS 3 BP 339 EP 365 PG 27 WC Environmental Sciences; Public, Environmental & Occupational Health; Toxicology SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Toxicology GA MD140 UT WOS:A1993MD14000007 PM 8260842 ER PT J AU PAIK, S NGUYEN, HD CHUNG, JN AF PAIK, S NGUYEN, HD CHUNG, JN TI A STUDY OF ARGON THERMAL PLASMA-FLOW OVER A SOLID SPHERE SO JOURNAL OF FLUID MECHANICS LA English DT Article ID REYNOLDS-NUMBERS; HEAT-TRANSFER AB The phenomena of momentum and heat transfer associated with an impulsively started spherical particle in a quiescent argon thermal plasma environment is considered. The changing plasma thermodynamics and transport property effects are studied using a Chebyshev-Legendre spectral method. Steady-state solutions for the case of constant sphere surface temperature are obtained and compared with previously published results. Transient solutions with particle internal heat conduction included are also presented. Results indicate that the magnitude of the drag force increases as the plasma free-stream temperature increases, while the Nusselt number decreases with increasing free-stream temperature. Effects due to different initial particle temperatures on the transient Nusselt number and drag coefficient are demonstrated. C1 WASHINGTON STATE UNIV, DEPT MECH & MAT ENGN, PULLMAN, WA 99164 USA. RP EG&G IDAHO INC, IDAHO NATL ENGN LAB, POB 1625, IDAHO FALLS, ID 83415 USA. NR 26 TC 2 Z9 2 U1 0 U2 1 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 JUL PY 1993 VL 252 BP 543 EP 564 DI 10.1017/S0022112093003878 PG 22 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA LP644 UT WOS:A1993LP64400024 ER PT J AU SONG, P RUSSELL, CT FITZENREITER, RJ GOSLING, JT THOMSEN, MF MITCHELL, DG FUSELIER, SA PARKS, GK ANDERSON, RR HUBERT, D AF SONG, P RUSSELL, CT FITZENREITER, RJ GOSLING, JT THOMSEN, MF MITCHELL, DG FUSELIER, SA PARKS, GK ANDERSON, RR HUBERT, D TI STRUCTURE AND PROPERTIES OF THE SUBSOLAR MAGNETOPAUSE FOR NORTHWARD INTERPLANETARY MAGNETIC-FIELD - MULTIPLE-INSTRUMENT PARTICLE OBSERVATIONS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID LATITUDE BOUNDARY-LAYER; DAYSIDE MAGNETOPAUSE; ELECTRIC-FIELDS; ION COMPOSITION; ISEE 1; PLASMA; MAGNETOSPHERE; RECONNECTION; MAGNETOSHEATH; ACCELERATION AB The structure and properties of the subsolar magnetopause for northward interplanetary magnetic field (IMF) are studied with measurements from 10 different instruments for three ISEE crossings. Data show that the overall structure and properties are similar for the three crossings, indicating the magnetopause is relatively well determined in the subsolar region for strongly northward IMF. The measurements from different instruments are consistent with each other and complementary based on the current knowledge of space plasma physics. The combined data set suggests that the magnetopause region is best organized by defining a sheath transition layer and steplike boundary layers. The sheath transition layer contains mostly magnetosheath particles. The magnetosheath, magnetospheric, and ionospheric populations are mixed in the interior boundary layers. This result, which is consistent with previous studies, is now supported by observations of a much broader spectrum of measurements including three-dimensional electron, energetic particle, heavy ion and plasma wave. Some new features are also found: even for quiet subsolar magnetopause crossings, transient or small-scale structures still occur sporadically; slight heating may occur in the boundary layers. Some outstanding issues are clarified by this study: the electron flux enhancements in the lowest energies in the boundary layers and magnetosphere are ionospheric electrons and not photoelectrons from the spacecraft; for northward IMF, they are photoelectrons, but for southward IMF they may be secondary electrons; and the density measurements from differential and integral techniques are similar, leaving no room for a significant ''invisible'' population. C1 UNIV IOWA,DEPT PHYS & ASTRON,IOWA CITY,IA 52242. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. LOCKHEED PALO ALTO RES LABS,PALO ALTO,CA 94304. OBSERV PARIS,DEPT RECH SPATIALE,F-92195 MEUDON,FRANCE. JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20723. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV CALIF LOS ANGELES,INST GEOPHYS & PLANETARY PHYS,LOS ANGELES,CA 90024. UNIV WASHINGTON,SEATTLE,WA 98195. RP SONG, P (reprint author), NATL CTR ATMOSPHER RES,HIGH ALTITUDE OBSERV,POB 3000,BOULDER,CO 80307, USA. NR 59 TC 75 Z9 77 U1 1 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JUL 1 PY 1993 VL 98 IS A7 BP 11319 EP 11337 DI 10.1029/93JA00606 PG 19 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LL822 UT WOS:A1993LL82200016 ER PT J AU CHENG, CZ CHANG, TC LIN, C TSAI, WH AF CHENG, CZ CHANG, TC LIN, C TSAI, WH TI MAGNETOHYDRODYNAMIC THEORY OF FIELD LINE RESONANCES IN THE MAGNETOSPHERE SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID AXISYMMETRIC TOROIDAL PLASMAS; PC 3-4 PULSATIONS; ULF WAVES; MAGNETIC-FIELD; STANDING WAVES; SPECTRA; DECAY AB The linearized ideal magnetohydrodynamic (MHD) equations are cast into a set of global differential equations from which the field line resonance equations of the shear Alfven waves and slow magnetosonic waves are obtained naturally for finite beta plasmas in general magnetic field geometries with flux surfaces. The coupling between the shear Alfven waves and the magnetosonic waves is through the combined effects of geodesic magnetic field curvature and plasma pressure. For axisymmetric magnetospheric equilibria there is no coupling between the shear Alfven waves and the slow magnetosonic waves because the geodesic magnetic field curvature vanishes. We derive the asymptotic singular solutions of the MHD equations near the field line resonant surface. We perform numerical solutions of the field line resonance equations for a dipole magnetic field with constant plasma pressure and density along the magnetic field line. Similar to previous studies, the shear Alfven wave field line resonant frequency is roughly given by omega almost-equal=to cL-4 rho-1/2, where the coefficient c is roughly constant with respect to the L shell distance and rho is the plasma mass density. The slow magnetosonic wave resonant frequency is roughly proportional to P/rhoL2, where P is the plasma pressure, and is much smaller than the shear Alfven wave resonant frequency even for equatorial plasma beta as high as unity. C1 NATL CENT UNIV,INST SPACE SCI,TAIPEI,TAIWAN. RP CHENG, CZ (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. RI Cheng, Chio/K-1005-2014 NR 33 TC 39 Z9 39 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JUL 1 PY 1993 VL 98 IS A7 BP 11339 EP 11347 DI 10.1029/93JA00505 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LL822 UT WOS:A1993LL82200017 ER PT J AU THOMAS, VA WINSKE, D AF THOMAS, VA WINSKE, D TI KINETIC SIMULATIONS OF THE KELVIN-HELMHOLTZ INSTABILITY AT THE MAGNETOPAUSE SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID LATITUDE BOUNDARY-LAYER; GLOBAL HYBRID SIMULATION; SOLAR-WIND INTERACTION; MAGNETOSPHERIC BOUNDARY; DAYSIDE MAGNETOPAUSE; MAGNETIC-FIELD; SHEAR-FLOW; PLASMA; VENUS; RECONNECTION AB Two-dimensional hybrid simulations with particle ions and fluid electrons are used to calculate the kinetic evolution of the Kelvin-Helmholtz instability for a magnetopauselike configuration. The unidirectional magnetic field is essentially transverse to the plasma flow velocity, which is the most unstable case according to linear theory and models the flow dynamics in the subsolar region of the magnetopause for northward and interplanetary magnetic field. We recover effects analogous to those found in MHD simulations, including a mode cascade to longer wavelengths. The boundary layer consists of coherent structure and is not well described by a diffusive process. Isolated structures on the order of the ion gyroradius are formed which can cross the boundary in either direction. We describe how the time evolution of these structures represents transport across boundary layers, and we consider the possible connection of these entities to flux transfer events and other structure seen in the low-latitude boundary layer at the Earth's magnetopause as well as to flux ropes commonly observed near the ionopause of Venus. We also discuss the relation of the hybrid calculations to previous MHD simulations and to observations. RP THOMAS, VA (reprint author), LOS ALAMOS NATL LAB,MS F645,LOS ALAMOS,NM 87545, USA. NR 58 TC 80 Z9 81 U1 0 U2 7 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JUL 1 PY 1993 VL 98 IS A7 BP 11425 EP 11438 DI 10.1029/93JA00604 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LL822 UT WOS:A1993LL82200025 ER PT J AU LARABELL, CA FUKUYAMA, K EPSTEIN, WL AF LARABELL, CA FUKUYAMA, K EPSTEIN, WL TI DESMOSOME DIFFERENTIATION DURING EPIDERMAL CORNIFICATION - NEW OBSERVATIONS OBTAINED FROM INTERMEDIATE VOLTAGE ELECTRON-MICROSCOPY SO JOURNAL OF INVESTIGATIVE DERMATOLOGY LA English DT Note ID TRANSGLUTAMINASE AB Human epidermis was examined under 400-kV intermediate voltage electron microscopy using epon sections cut 5 - 8 times thicker than usual ultrathin sections. Asymmetry of desmosomal structures occurred as cells became cornified. Electron-dense proteins deposited at the inner leaflet of the plasma membrane of corneocytes do not extend into the desmosomal area, which connects to granular cells. Stereo micrographs revealed the existence of two different cellular elements at the cell surface confirming that the plasma membrane first thickened in areas without desmosomes. Examination of the three-dimensional nature of desmosomes and keratin-filament aggregation without serial sectioning and/or selecting a strict angle of the tissues will allow us to extend our ultrastructural knowledge. C1 UNIV CALIF SAN FRANCISCO,DEPT DERMATOL,SAN FRANCISCO,CA 94143. LAWRENCE BERKELEY LAB,INTERMEDIATE VOLTAGE ELECTRON MICROSCOPE FACIL,BERKELEY,CA 94720. FU NCRR NIH HHS [RR 05097]; NIAMS NIH HHS [AR 12433] NR 12 TC 3 Z9 3 U1 0 U2 1 PU BLACKWELL SCIENCE INC PI CAMBRIDGE PA 238 MAIN ST, CAMBRIDGE, MA 02142 SN 0022-202X J9 J INVEST DERMATOL JI J. Invest. Dermatol. PD JUL PY 1993 VL 101 IS 1 BP 103 EP 104 DI 10.1111/1523-1747.ep12361185 PG 2 WC Dermatology SC Dermatology GA LM653 UT WOS:A1993LM65300019 PM 8331292 ER PT J AU DAWSON, MI HOBBS, PD RHEE, SW MORIMOTO, H WILLIAMS, PG AF DAWSON, MI HOBBS, PD RHEE, SW MORIMOTO, H WILLIAMS, PG TI SYNTHESIS OF [1',3',4'-H-3(3)]4-(5',6',7',8',-TETRAHYDRO-5',5',8',8'-TETRAMETHYL-2'-A NTHRACENYL)BENZOIC ACID FOR BINDING-STUDIES OF RETINOIC ACID RECEPTORS SO JOURNAL OF LABELLED COMPOUNDS & RADIOPHARMACEUTICALS LA English DT Article DE RAR; RETINOIC ACID RECEPTOR; RETINOID; [1',3',4'-H-3(3)]4-(5',6',7',8'-TETRAHYDRO-5',5',8',8'-TETRAMETHYL-2'-AN THRACENYL)BENZOIC ACID; [H-3(3)]TTAB ID IDENTIFICATION AB [1',3',4'-H-3(3)]4- (5', 6', 7', 8'-Tetrahydro-5', 5', 8',8'-tetramethyl-2'-anthracenyl)benzoic acid (specific activity 64 Ci/mmole) was synthesized by bromination of ethyl 4-(5',6',7',8'-tetrahydro-5',5',8',8'-tetramethyl-2'-anthracenyl)benzoate, followed by reductive debromination by tritium gas in the presence of 10% palladium on carbon and hydrolysis. H-1 and H-3 NMR spectroscopy was used to establish tritium at 1',3',4'-tetrahydroanthracenyl ring positions. C1 LAWRENCE BERKELEY LAB,NATL TRITIUM LABELING FACIL,BERKELEY,CA 94720. RP DAWSON, MI (reprint author), SRI INT,BIOORGAN CHEM LAB,MENLO PK,CA 94025, USA. NR 9 TC 5 Z9 5 U1 0 U2 1 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 JUL PY 1993 VL 33 IS 7 BP 633 EP 637 DI 10.1002/jlcr.2580330710 PG 5 WC Biochemical Research Methods; Chemistry, Medicinal; Chemistry, Analytical SC Biochemistry & Molecular Biology; Pharmacology & Pharmacy; Chemistry GA LK751 UT WOS:A1993LK75100009 ER PT J AU DING, YS FOWLER, JS WOLF, AP AF DING, YS FOWLER, JS WOLF, AP TI RAPID, REGIOSPECIFIC SYNTHESES OF DEUTERIUM SUBSTITUTED 6-[F-18]FLUORODOPAMINE (ALPHA,ALPHA-D2 BETA,BETA-D2 AND ALPHA,ALPHA,BETA,BETA-D4) FOR MECHANISTIC STUDIES WITH POSITRON EMISSION TOMOGRAPHY SO JOURNAL OF LABELLED COMPOUNDS & RADIOPHARMACEUTICALS LA English DT Article DE 6-FLUORODOPAMINE; 6-FLUORONOREPINEPHRINE; F-18; DEUTERIUM ISOTOPE EFFECT; PET; HEART; MAO; DBH ID NUCLEOPHILIC AROMATIC-SUBSTITUTION; OXIDATIVE DEAMINATION; DOPAMINE AB Doubly labeled (F-18 and deuterium) 6-fluorodopamine (6-FDA) isotopomers were prepared to probe the contribution of metabolism by monoamine oxidase (MAO) and dopamine beta-hydroxylase (DBH) on the kinetics of 6-[F-18]FDA in baboon heart. Specifically deuterated 6-[F-18]FDA-alpha,alpha-D2 and 6-[F-18]FDA-beta,beta-D2 were prepared by a six-step synthesis starling from nucleophilic aromatic substitution with NCA [F-18]fluoride on 6-nitropiperonal or 6-nitropiperonal-D in a decay corrected radiochemical yield of 3-10% (EOB). 6-[F-18]FDA-alpha,alpha,beta,beta-D4 was prepared in 4 steps in a radiochemical yield of 16-20% (EOB) and specific activity 2-5 Ci/mumol EOB). The regiospecificity of deuterium substitution in the synthesis of 6-[F-18]FDA-alpha,alpha,beta,beta-D4 was verified using piperonal as a substrate. RP DING, YS (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 20 TC 12 Z9 12 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 JUL PY 1993 VL 33 IS 7 BP 645 EP 654 DI 10.1002/jlcr.2580330712 PG 10 WC Biochemical Research Methods; Chemistry, Medicinal; Chemistry, Analytical SC Biochemistry & Molecular Biology; Pharmacology & Pharmacy; Chemistry GA LK751 UT WOS:A1993LK75100011 ER PT J AU PHELPS, RB BIRMINGHAM, JT RICHARDS, PL AF PHELPS, RB BIRMINGHAM, JT RICHARDS, PL TI ORIENTATIONAL ORDERING IN QUENCH-CONDENSED H-2 MEASURED BY AC CALORIMETRY SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article ID 1ST-ORDER PHASE-TRANSITIONS; THIN-FILM GROWTH; QUANTUM-SYSTEMS; SURFACE; HYDROGEN; GOLD; H2; TEMPERATURES; ADSORPTION; MICROSCOPY AB The heat capacity of quench-condensed normal- and para-hydrogen has been measured using ac calorimetry. The measurements were made at temperatures from 1.6 to 3.7 K on sapphire and evaporated gold substrates. The range of exposures studied was 0.24 to 3.3 angstrom-2 yielding estimated coverages from 0.07 to-2.5 angstrom-2. For reference, monolayer completion of H-2 on graphite occurs at a coverage of 0. 1 angstrom-2. For normal-hydrogen (n-H-2) on a few of our sapphire substrates, the heat capacity as a function of temperature exhibits a peak at 1.8 K, followed by a rapid decrease. For the n-H-2 data on all other substrates, a negative slope is observed at the lowest temperatures measured, which is consistent with apeak below.our temperature range. We attribute these effects to a bulk-like orientational ordering transition. The coverage dependence of the peak is not consistent with the predictions of a model of finite-size effects. We conclude that the dominant broadening of the peak is inhomogeneous. The desorption rate is deduced from the time dependence of the heat capacity and is found to agree with previously published values. The ortho-to-para conversion rate is comparable to that of bulk hydrogen. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. NR 35 TC 3 Z9 3 U1 1 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD JUL PY 1993 VL 92 IS 1-2 BP 107 EP 125 DI 10.1007/BF00681874 PG 19 WC Physics, Applied; Physics, Condensed Matter SC Physics GA LY172 UT WOS:A1993LY17200006 ER PT J AU FISHMAN, RS LIU, SH AF FISHMAN, RS LIU, SH TI PHASE-DIAGRAM OF CHROMIUM-ALLOYS SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Letter AB Using mean field theory, we have constructed the phase diagram of chromium alloys. At zero temperature, we find a first-order phase transition from the incommensurate to the commensurate state with manganese doping. Within a small window of manganese concentrations, a first-order phase transition from the commensurate to the incommensurate states occurs with decreasing temperature, in agreement with experiments performed over 25 years ago on CrMn alloys. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP FISHMAN, RS (reprint author), N DAKOTA STATE UNIV,DEPT PHYS,FARGO,ND 58105, USA. RI Fishman, Randy/C-8639-2013 NR 16 TC 3 Z9 3 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD JUL PY 1993 VL 125 IS 1-2 BP L1 EP L6 DI 10.1016/0304-8853(93)90809-G PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA LQ747 UT WOS:A1993LQ74700001 ER PT J AU LARSON, EM WONG, J HOLT, JB WAIDE, PA NUTT, G RUPP, B TERMINELLO, LJ AF LARSON, EM WONG, J HOLT, JB WAIDE, PA NUTT, G RUPP, B TERMINELLO, LJ TI A TIME-RESOLVED DIFFRACTION STUDY OF THE TA-C SOLID COMBUSTION SYSTEM SO JOURNAL OF MATERIALS RESEARCH LA English DT Article AB The formation of TaC and Ta2C by combustion synthesis from their elemental constituents has been studied by time-resolved x-ray diffraction (TRXRD) using synchrotron radiation. The reactions have been followed with a time resolution down to 50 ms. Since the adiabatic temperatures for both reactions are well below any liquidus temperature in the Ta-C phase diagram, no melting occurs and these combustion reactions occur purely in the solid state. The phase transformations associated with these reactions are followed by monitoring the disappearance of reactant and appearance of product powder diffraction peaks in real time as the reaction front propagates through the combusting specimen. In the synthesis of TaC, the results show the formation of the subcarbide (Ta2C) phase as an intermediate. In the synthesis of Ta2C, the reaction proceeds directly to the product with no discernible intermediate Ta-C phase within a 50 ms time frame. The chemical dynamics associated with the combustion synthesis of TaC may be described by an initial phase transformation to hexagonal Ta2C arising from carbon diffusion into the Ta metal lattice. As more carbon is available this intermediate subcarbide phase, which has one-half of its octahedral interstices occupied by the carbon, further transforms to the cubic TaC final product, in which all octahedral sites are now occupied. The time-resolved data indicate that the rate of formation of Ta2C is a factor of two faster than that of TaC. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. NR 25 TC 40 Z9 41 U1 0 U2 4 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD JUL PY 1993 VL 8 IS 7 BP 1533 EP 1541 DI 10.1557/JMR.1993.1533 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA LJ824 UT WOS:A1993LJ82400010 ER PT J AU BRUEMMER, SM AREY, BW BRIMHALL, JL HIRTH, JP AF BRUEMMER, SM AREY, BW BRIMHALL, JL HIRTH, JP TI HOT-HARDNESS COMPARISONS AMONG ISOSTRUCTURAL BE12X INTERMETALLIC COMPOUNDS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article AB Hot hardness has been measured in seven isostructural Be12X compounds: Be12Cr, Be12Mn, Be12V, Be12Mo, Be12Ti, Be12Ta, and Be12Nb. All vacuum-hot-pressed (VHP) materials exhibited similar hardness levels (800 to 1000 kg/mm2) at low temperatures (<600-degrees-C), but sharply diverged at higher temperatures. Most compounds showed a sharp decrease in hardness above about one-half their melting temperatures except for Be12Nb and Be12Ti which maintained strength until higher temperatures. Ductile-brittle transition temperatures (DBTT's) of 600, 625, 690, 700, 700, and 850-degrees-C were determined for Be12Cr, Be12Mn, Be12V, Be12Mo, Be12Ti, and Be12Nb, respectively. Hot-isostatically-pressed (HIP) and VHP Be12Nb heats both showed comparable behavior, indicating that the temperature required for macroscopic plasticity is not dependent on processing conditions. Differences in slip characteristics were observed between beryllides with similar melting temperatures, but differing DBTT's. Dislocations were activated on multiple slip systems in Be12V during compressive deformation at 800-degrees-C. Similar behavior was not observed in Be12Nb until test temperatures above 1000 It is proposed that dislocation mobility may be related to the stability between Be12X and Be17X2 phases. Larger refractory metal atoms such as Nb may form faulted layers related to Be17X2 StruCtUres and thereby impede deformation at intermediate temperatures. Smaller atoms such as Cr, Mn, V, and Mo do not form a stable Be17X2 phase and thereby allow enhanced dislocation mobility at these temperatures. C1 WASHINGTON STATE UNIV, PULLMAN, WA 99164 USA. RP BRUEMMER, SM (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 20 TC 5 Z9 5 U1 1 U2 2 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD JUL PY 1993 VL 8 IS 7 BP 1550 EP 1557 DI 10.1557/JMR.1993.1550 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA LJ824 UT WOS:A1993LJ82400012 ER PT J AU CHOU, TC NIEH, TG AF CHOU, TC NIEH, TG TI KINETICS OF MOSI2 PEST DURING LOW-TEMPERATURE OXIDATION SO JOURNAL OF MATERIALS RESEARCH LA English DT Article AB The kinetics of MoSi2 pest, caused by oxidation in air, has been studied. Experimental results indicated that pest disintegration occurred at temperatures between 375 and 500-degrees-C. The volumes of test samples increased with oxidation duration. Analysis of change in sample volume versus oxidation duration revealed that the pest disintegration consisted of two stages, namely nucleation (or incubation) and growth. The onset of the growth stage depended on the test temperature. More importantly, changes in sample volume were found to obey a linear relationship with time during the growth stage. Equations were formulated to demonstrate that the growth kinetics of pest disintegration was proportional to the rates of change in sample volume. The rates of volume change during MoSi2 pest were calculated to be 4.9 X 10(-6), 2.8 X 10(-5), 3.7 X 10(-5), and 5.4 X 10(-5) cm3/s at 375, 400, 425, and 450-degrees-C, respectively; the growth kinetics increased with oxidation temperature. The activation energy for the growth stage of pest disintegration was determined to be 27.6 kcal/mole, which agrees well with the activation energy for the low-temperature oxidation Of MoSi2. C1 LOCKHEED RES & DEV DIV,PALO ALTO,CA 94304. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RI Nieh, Tai-Gang/G-5912-2011 OI Nieh, Tai-Gang/0000-0002-2814-3746 NR 24 TC 27 Z9 31 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 JUL PY 1993 VL 8 IS 7 BP 1605 EP 1610 DI 10.1557/JMR.1993.1605 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA LJ824 UT WOS:A1993LJ82400019 ER PT J AU ALLENDORF, MD HURT, RH YANG, N REAGAN, P ROBBINS, M AF ALLENDORF, MD HURT, RH YANG, N REAGAN, P ROBBINS, M TI DEPOSITION OF SILICON-CARBIDE USING THE CHEMICAL-VAPOR COMPOSITES PROCESS - PROCESS CHARACTERIZATION AND COMPARISON WITH RASSPVDN MODEL PREDICTIONS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID BALLISTIC DEPOSITION; GROWTH; FILMS AB In this work, we explore the use of the chemical vapor composites (CVC) process to increase the rates of silicon carbide (SiC) growth on graphite substrates. Large SiC seed particles are used that are deposited by gravity-driven sedimentation. The results show that addition of large (d(p) = 28 mum) SiC seed particles to a gas phase containing hydrogen and methyltrichlorosilane increases the deposition rate of SiC by amounts substantially higher than that expected from the addition of the particle volume alone. Insight into the mechanism of this deposition rate enhancement is obtained through analysis of SEM photographs of deposits. Growth rates and deposit structures are consistent with the trends predicted by the previously developed random-sphere model of simultaneous particle-vapor deposition (RASSPVDN), which is used here to interpret the data. C1 THERMOTREX CORP,WALTHAM,MA 02254. RP ALLENDORF, MD (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. NR 19 TC 7 Z9 7 U1 0 U2 1 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD JUL PY 1993 VL 8 IS 7 BP 1651 EP 1665 DI 10.1557/JMR.1993.1651 PG 15 WC Materials Science, Multidisciplinary SC Materials Science GA LJ824 UT WOS:A1993LJ82400024 ER PT J AU HRUBESH, LW KEENE, LE LATORRE, VR AF HRUBESH, LW KEENE, LE LATORRE, VR TI DIELECTRIC-PROPERTIES OF AEROGELS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article AB We have measured the real (dielectric constant) and imaginary (loss factor) components of the complex relative permittivity at 298 K using microwave frequencies (2, 10, and 18-40 GHz) for bulk SiO2-aerogels and for two types of organic aerogels, resorcinol-formaldehyde (RF) and melamine-formaldehyde (MF). Measured dielectric constants are found to vary linearly between values of 1.0 and 2.0 for aerogel densities from 10 to 500 kg/m3. For the same range of densities, the measured loss tangents vary linearly between values of 2 x 10(-4) and 7 X 10(-2). The observed linearity of the dielectric properties with density in aerogels at microwave frequencies shows that their dielectric behavior is more gas-like than solid-like. The dielectric properties of aerogels are shown to be significantly affected by the adsorbed water internal to the bulk material. For example, water accounts for 7% of the dielectric constant and 70% of the loss at microwave frequencies for silica aerogels. Because of their very high porosity, even with the water content, the aerogels are among the few materials exhibiting such low dielectric properties. Our measurements show that aerogels with greater than 99% porosity have dielectric constants less than 1.03; these are the lowest values ever reported for a bulk solid material. RP HRUBESH, LW (reprint author), LAWRENCE LIVERMORE NATL LAB, DEPT CHEM & MAT SCI, LIVERMORE, CA 94550 USA. NR 14 TC 119 Z9 122 U1 3 U2 21 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD JUL PY 1993 VL 8 IS 7 BP 1736 EP 1741 DI 10.1557/JMR.1993.1736 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA LJ824 UT WOS:A1993LJ82400034 ER PT J AU GARG, AK DEJONGHE, LC AF GARG, AK DEJONGHE, LC TI METAL-COATED COLLOIDAL PARTICLES SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID MATRIX COMPOSITES AB Procedures are described for coating of submicrometre ceramic powders with copper and nickel. The process required precoating of the core particles with a palladium catalyst. A precoating procedure was developed in which palladium chloride is reduced by sodium hypophosphite or stannous chloride on the powder surface in aqueous suspensions. Commercial electroless solutions were used to deposit copper and nickel on the catalysed powders. The effect of various experimental parameters on the effectiveness of the surface conditioning of the particles was also investigated. C1 LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. NR 23 TC 25 Z9 28 U1 0 U2 7 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD JUL 1 PY 1993 VL 28 IS 13 BP 3427 EP 3432 DI 10.1007/BF01159817 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA LM062 UT WOS:A1993LM06200003 ER PT J AU RAWERS, J PETTY, AV AF RAWERS, J PETTY, AV TI HIGH-PRESSURE NITROGEN GAS ALLOYING OF FE-CR-NI ALLOYS .1. NITRIDE COMPOSITION AND NITROGEN CONCENTRATION SO JOURNAL OF MATERIALS SCIENCE LA English DT Article AB The concentration of nitrogen in molten Fe-Cr-Ni alloys has been substantially increased by melting under nitrogen overpressures. Total nitrogen concentrations exceeding 26 at % were obtained when melted under 200 MPa. Nitrogen is present in solidified alloys as interstitial nitrogen and as metal nitrides. The nitrogen concentration depends upon the alloy composition; nickel decreases the nitrogen concentration, whereas chromium increases the concentration. When iron and Fe-Ni alloys were melted under high nitrogen pressures they produced iron nitrides and when Fe-Cr-Ni alloys were melted they produced CrN dendrites and precipitates. RP RAWERS, J (reprint author), US BUR MINES,ALBANY RES CTR,ALBANY,OR 97321, USA. NR 21 TC 11 Z9 11 U1 0 U2 0 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD JUL 1 PY 1993 VL 28 IS 13 BP 3489 EP 3495 DI 10.1007/BF01159827 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA LM062 UT WOS:A1993LM06200013 ER PT J AU VETRANO, JS KLEEBE, HJ HAMPP, E HOFFMANN, MJ RUHLE, M CANNON, RM AF VETRANO, JS KLEEBE, HJ HAMPP, E HOFFMANN, MJ RUHLE, M CANNON, RM TI YB2O3-FLUXED SINTERED SILICON-NITRIDE .1. MICROSTRUCTURE CHARACTERIZATION SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID HOT-PRESSED SI3N4; HIGH-TEMPERATURE STRENGTH; GRAIN-BOUNDARY; ELECTRON-MICROSCOPY; CERAMIC MATERIALS; PHASE; CRYSTALLIZATION; GLASS; Y2O3; ADDITIONS AB Microstructural development and crystallization behaviour of Yb2O3-fluxed sintered silicon nitride materials was investigated using CTEM and HREM. The materials contained 5 and 10 vol% Yb2O3 as sintering additives. After densification, both compositions were subsequently heat treated to crystallize the residual amorphous secondary phases present at triple-grain regions. In the material doped with 5 vol% Yb2O3, only an amorphous secondary phase was observed after sintering, which was about 80% crystalline (Yb2Si2O7) after the post-sintering heat treatment. A metastable phase was formed in the material with 10 vol% additives after sintering, with about 70% crystallinity in the triple-point pockets. Upon post-sintering heat treatment, the material could be completely crystallized. During heat treating, the metastable phase combined with the remaining glass to form Yb2SiO5 plus Yb2Si2O7 and a small amount of Si3N4 which deposited epitaxially on pre-existing Si3N4 grains in areas of low-energy within the triple-point pockets. All materials contained thin amorphous films separating the grains. The amorphous intergranular films along grain boundaries (homophase boundaries) revealed excess ytterbium and oxygen. The thickness of the intergranular films was about 1.0 and 2.5 nm for the grain boundaries and the phase boundaries, respectively, independent of additive content and heat-treatment history. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP VETRANO, JS (reprint author), MAX PLANCK INST MET RES,INST WERKSTOFFWISSENSCH,SEESTR 92,W-7000 STUTTGART 80,GERMANY. RI Kleebe, Hans-Joachim/C-5709-2016 NR 54 TC 61 Z9 64 U1 2 U2 10 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD JUL 1 PY 1993 VL 28 IS 13 BP 3529 EP 3538 DI 10.1007/BF01159834 PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA LM062 UT WOS:A1993LM06200020 ER PT J AU WAGH, AS SINGH, JP POEPPEL, RB AF WAGH, AS SINGH, JP POEPPEL, RB TI DEPENDENCE OF CERAMIC FRACTURE PROPERTIES ON POROSITY SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID MECHANICAL-PROPERTIES; STRENGTH AB A connected-grain model developed earlier to study the modulus of elasticity as a power-law of density was extended to study the dependence of the flexural strength of polycrystalline ceramics on porosity. Relations were derived for specific surface fracture energy, fracture toughness and flexural strength as power laws of (1 - p), where p is porosity. Model validity was confirmed with data on alpha-alumina, UO2, Si3N4, and the YBa2Cu3O7-delta superconductor. C1 UNIV W INDIES,DEPT PHYS,MAT LAB,KINGSTON 7,JAMAICA. RP WAGH, AS (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. OI Wagh, Arun/0000-0002-8678-7574 NR 24 TC 69 Z9 69 U1 1 U2 16 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD JUL 1 PY 1993 VL 28 IS 13 BP 3589 EP 3593 DI 10.1007/BF01159841 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA LM062 UT WOS:A1993LM06200027 ER PT J AU PAN, WY YUE, CF LIN, KW SUN, S TUTTLE, BA AF PAN, WY YUE, CF LIN, KW SUN, S TUTTLE, BA TI THERMALLY ACTIVATED REJUVENATION OF FERROELECTRIC PROPERTIES IN ELECTRICALLY FATIGUED LEAD-ZIRCONATE-TITANATE CERAMICS SO JOURNAL OF MATERIALS SCIENCE LETTERS LA English DT Article C1 SANDIA NATL LABS,DEPT ELECTR CERAM,ALBUQUERQUE,NM 87185. RP PAN, WY (reprint author), NEW MEXICO INST MIN & TECHNOL,DEPT MAT & MET ENGN,SOCORRO,NM 87801, USA. NR 8 TC 11 Z9 12 U1 1 U2 3 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0261-8028 J9 J MATER SCI LETT JI J. Mater. Sci. Lett. PD JUL 1 PY 1993 VL 12 IS 13 BP 986 EP 991 DI 10.1007/BF00420195 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA LM061 UT WOS:A1993LM06100009 ER PT J AU TOMASCHITZ, R AF TOMASCHITZ, R TI ELECTROMAGNETIC-RADIATION IN MULTIPLY CONNECTED ROBERTSON-WALKER COSMOLOGIES SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article ID QUANTUM AB Maxwell's equations on a topologically nontrivial cosmological background are studied. The cosmology is locally determined by a Robertson-Walker line element, but the spacelike slices are open hyperbolic manifolds, whose topology and geometry may vary in time. In this context the spectral resolution of Maxwell's equations in terms of horospherical elementary waves generated at infinity of hyperbolic space is given. The wave fronts are orthogonal to bundles of unstable geodesic rays, and the eikonal of geometric optics appears just as the phase of the horospherical waves. This fact is used to attach to the unstable geodesic rays a quantum mechanical momentum. In doing so the quantized energy-momentum tensor of the radiation field is constructed in a geometrically and dynamically transparent way, without appealing to the intricacies of the second quantization. In particular Planck's radiation formula, and the bearing of the multiply connected topology on the fluctuations in the temperature of the background radiation is discussed. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP TOMASCHITZ, R (reprint author), UNIV PADUA,DIPARTIMENTO MATEMAT PURA & APPL,VIA BELZONI 7,I-35131 PADUA,ITALY. NR 19 TC 13 Z9 13 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0022-2488 J9 J MATH PHYS JI J. Math. Phys. PD JUL PY 1993 VL 34 IS 7 BP 3133 EP 3150 DI 10.1063/1.530067 PG 18 WC Physics, Mathematical SC Physics GA LK510 UT WOS:A1993LK51000034 ER PT J AU SHORE, BW KNIGHT, PL AF SHORE, BW KNIGHT, PL TI THE JAYNES-CUMMINGS MODEL SO JOURNAL OF MODERN OPTICS LA English DT Review ID ROTATING-WAVE APPROXIMATION; QUANTUM-NONDEMOLITION MEASUREMENTS; POISSONIAN PHOTON STATISTICS; ATOM-FIELD INTERACTION; RAMAN-COUPLED MODEL; KERR-LIKE MEDIUM; N-LEVEL ATOM; QUANTIZED RADIATION-FIELD; TIME-AVERAGED PROPERTIES; SCHRODINGER-CAT STATES AB The Jaynes-Cummings model (JCM), a soluble fully quantum mechanical model of an atom in a field, was first used (in 1963) to examine the classical aspects of spontaneous emission and to reveal the existence of Rabi oscillations in atomic excitation probabilities for fields with sharply defined energy (or photon number). For fields having a statistical distributions of photon numbers the oscillations collapse to an expected steady value. In 1980 it was discovered that with appropriate initial conditions (e.g. a near-classical field), the Rabi oscillations would eventually revive, only to collapse and revive repeatedly in a complicated pattern. The existence of these revivals, present in the analytic solutions of the JCM, provided direct evidence for discreteness of field excitation (photons) and hence for the truly quantum nature of radiation. Subsequent study revealed further non-classical properties of the JCM field, such as a tendency of the photons to antibunch. Within the last two years it has been found that during the quiescent intervals of collapsed Rabi oscillations the atom and field exist in a macroscopic superposition state (a Schrodinger cat). This discovery offers the opportunity to use the JCM to elucidate the basic properties of quantum correlation (entanglement) and to explore still further the relationship between classical and quantum physics. The relative simplicity of the JCM and the ease with which it can be extended through analytic expressions or numerical computation continues to motivate attention, as evidenced by the growing abundance of publications. We here present an overview of the theory of the JCM and some of the many extensions and generalizations that have appeared. C1 UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, BLACKETT LAB, LONDON SW7 2BZ, ENGLAND. RP LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 267 TC 759 Z9 776 U1 14 U2 82 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND SN 0950-0340 EI 1362-3044 J9 J MOD OPTIC JI J. Mod. Opt. PD JUL PY 1993 VL 40 IS 7 BP 1195 EP 1238 DI 10.1080/09500349314551321 PG 44 WC Optics SC Optics GA LQ911 UT WOS:A1993LQ91100001 ER PT J AU MAGRUDER, RH HENDERSON, DO WHITE, CW ZUHR, RA AF MAGRUDER, RH HENDERSON, DO WHITE, CW ZUHR, RA TI FORMATION OF PHOTOSENSITIVE MATERIALS BY ION-IMPLANTATION OF OXYGEN IONS IN SILICA SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Letter ID OPTICAL FIBERS AB Oxygen ions were implanted at 5 MeV in high purity silica to a dose of 3 x 10(16) ions/cm2. Samples were subsequently exposed to a series of 5 eV KrF excimer laser irradiations. Optical absorption and infrared reflectance spectra were measured before and after each series of irradiations. This material exhibits a photobleaching behavior that may be useful for planar waveguide devices. C1 FISK UNIV,DEPT PHYS,NASHVILLE,TN 37203. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP MAGRUDER, RH (reprint author), VANDERBILT UNIV,DEPT MAT SCI & ENGN,BOX 1593-B,NASHVILLE,TN 37235, USA. NR 21 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD JUL PY 1993 VL 159 IS 3 BP 269 EP 273 DI 10.1016/0022-3093(93)90233-N PG 5 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA LK258 UT WOS:A1993LK25800011 ER PT J AU SHIDARA, H DENN, MM AF SHIDARA, H DENN, MM TI POLYMER MELT FLOW IN VERY THIN SLITS SO JOURNAL OF NON-NEWTONIAN FLUID MECHANICS LA English DT Article DE EXTRUSION; POLYETHYLENE; POLYMERS; POLYSTYRENE; SLIT DIES; WALL SLIP ID WALL SLIP; POLYETHYLENE; VISCOSITY; HEAT AB Extrusion of linear low-density polyethylene and polystyrene through slit dies with spacings as small as 34 mum indicates qualitative differences between the polymers in the region of unstable flow. Polyethylene appears to exhibit wall slip, while slip is not evident with polystyrene. An apparent wall-induced reduction in polystyrene viscosity reported by Burton and coworkers was not observed. C1 UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. MORINAGA MILK IND CO LTD,ENGN RES CTR,HIGASHIYAMATO,TOKYO 207,JAPAN. LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. NR 16 TC 20 Z9 20 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-0257 J9 J NON-NEWTON FLUID JI J. Non-Newton. Fluid Mech. PD JUL PY 1993 VL 48 IS 1-2 BP 101 EP 110 DI 10.1016/0377-0257(93)80066-K PG 10 WC Mechanics SC Mechanics GA LR051 UT WOS:A1993LR05100005 ER PT J AU MCWHINNEY, HG JAMES, WD SCHWEIKERT, EA WILLIAMS, JR HOLLENBERG, G WELSH, J SEREATAN, W AF MCWHINNEY, HG JAMES, WD SCHWEIKERT, EA WILLIAMS, JR HOLLENBERG, G WELSH, J SEREATAN, W TI DIFFUSION OF LI-6 ISOTOPES IN LITHIUM ALUMINATE CERAMICS USING NEUTRON DEPTH PROFILING SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article AB Lithium Ceramics offer tremendous potential as a source for the production of tritium (H-3) for fusion power reactors. Their successful application will depend to a great extent upon the diffusion properties of the Li-6 within the matrix. Consequently knowledge od Li-6 concentration gradients in the ceramic matrices is an important requirement in the continued development of the technology. In this investigation, the neutron depth profile (NDP) technique has been applied to the study of concentration profiles of Li-6 in lithium aluminate ceramics, doped with 1.8%, 50% and 95% Li-6 isotopic concentrations. Specimen for analysis were prepared at Battelle (PNL) as pellet discs. Samples for diffusion studies were arranged as diffusion couples in the following manner: 1.8% Li-6 discs/85% Li-6 powder. Experiments were performed at the Texas A&M Nuclear Science Center Reactor Building, utilizing 1 MW equivalent thermal neutron fluxes 3 x 10(11) n/m2s. The depth probed by the technique is approximately 15 mum. Diffusion coefficients are in the range of 2.1 x 10(-12) to 7.0 x 10(-11) m2 s-1 for 1.8% Li-6-doped ceramics annealed at 1200 and 1400-degrees-C, for 4 to 48-h anneal times. C1 TEXAS A&M UNIV SYST, CTR CHEM CHARACTERIZAT & ANAL, COLL STN, TX 77843 USA. US DOE, PACIFIC NW LAB, NUCL REACTOR MAT GRP, HANFORD, WA 99352 USA. RP MCWHINNEY, HG (reprint author), PRAIRIE VIEW A&M UNIV, DEPT CHEM, PRAIRIE VIEW, TX 77446 USA. RI Schweikert, Emile/B-7385-2015 OI Schweikert, Emile/0000-0003-3964-7998 NR 8 TC 3 Z9 3 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD JUL PY 1993 VL 203 IS 1 BP 43 EP 49 DI 10.1016/0022-3115(93)90428-2 PG 7 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA LN297 UT WOS:A1993LN29700006 ER PT J AU FOSTER, JP HOUGHTALING, TK BOLTAX, A AF FOSTER, JP HOUGHTALING, TK BOLTAX, A TI BOWING BEHAVIOR OF A COLD-WORKED 316-STAINLESS STEEL DUCT SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article AB Duct bowing, swelling, and irradiation creep strain gradients were measured on a cold-worked 316 SS internal duct in a blanket rod test that was irradiated in the EBR-II facility. This duct is unique because for the first time axial profiles of swelling and irradiation creep data were obtained in addition to the bow deflection. The irradiation creep data were obtained from scribe marks placed on the duct prior to irradiation. Large differences of swelling and irradiation creep strain were measured on opposite sides of the fluted duct. The qualitative behavior of the measured bowing, swelling, and irradiation creep strain gradients was self-consistent. The NUBOW-3D Inelastic computer program was used to predict the bow deflection and axial irradiation creep strain profiles were calculated using the NUBOW-3D Inelastic computer code (a time history stress analysis program) using a swelling equation developed from the duct immersion density data. The predicted bow deflection and irradiation creep strain profiles were in good agreement with the data. Bow deflection predictions were found to be most sensitive to irradiation creep. A 60% reduction in the Mark 6 irradiation creep equation was necessary to obtain consistency between the calculation and measurements. This reduction is qualitatively consisten with irradiation creep strain modifications derived from a slit tube test. C1 WESTINGHOUSE ELECT CO,SAVANNAH RIVER TECHNOL CTR,AIKEN,SC 29808. RP FOSTER, JP (reprint author), WESTINGHOUSE ELECT CORP,CTR SCI & TECHNOL,PITTSBURGH,PA 15235, USA. NR 9 TC 0 Z9 0 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 JUL PY 1993 VL 202 IS 3 BP 275 EP 285 DI 10.1016/0022-3115(93)90397-H PG 11 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA LP017 UT WOS:A1993LP01700010 ER PT J AU EARY, JF COLLINS, C STABIN, M VERNON, C PETERSDORF, S BAKER, M HARTNETT, S FERENCY, S ADDISON, SJ APPELBAUM, F GORDON, EE AF EARY, JF COLLINS, C STABIN, M VERNON, C PETERSDORF, S BAKER, M HARTNETT, S FERENCY, S ADDISON, SJ APPELBAUM, F GORDON, EE TI SAMARIUM-153-EDTMP BIODISTRIBUTION AND DOSIMETRY ESTIMATION SO JOURNAL OF NUCLEAR MEDICINE LA English DT Article ID METASTATIC CARCINOMA; BONE METASTASES; PROSTATE; PALLIATION; SR-89 AB Fifty-two patients were treated with single doses of Sm-153-EDTMP in a Phase I escalating dose protocol for palliation of bone pain from metastatic prostate carcinoma. Samarium-153 (T1/2 46.3 hr), maximum beta- particle energies 810 keV (20%), 71 0 keV (30%), 640 keV (500/.), gamma photon 103 keV (28%), was complexed to the tetraphosphonate chelate, EDTMP. Five groups of patients were treated at doses of 1.0, 1.5, 2.0, 2.5, and 3.0 mCi/kg to evaluate toxicity from treatment. Patients were screened prior to treatment and followed after treatment with Tc-99m-MDP bone scans. Biodistribution data on this group of patients were acquired and showed rapid uptake of Sm-153-EDTMP into bone with complete clearance of nonskeletal radiotoxicity by 6-8 hr. Also included are complete sets of dosimetry estimations on an additional seven patients who received 0.5 mCi/kg Sm-153-EDTMP Ca++ as part of a multiple dose therapy trial. Estimated radiation absorbed doses to bone surfaces averaged 25,000 mrad/mCi (6686 Gy/MBq), and urinary bladder doses averaged 3600 mrad/mCi (964 Gy/MBq). C1 UNIV WASHINGTON,MED CTR,DEPT MED,SEATTLE,WA 98195. MARION MERRELL DOW,INDIANAPOLIS,IN. OAK RIDGE NATL LAB,OAK RIDGE,TN. RP EARY, JF (reprint author), UNIV WASHINGTON,MED CTR,DEPT RADIOL,DIV NUCL MED,1959 NE PACIFIC,SEATTLE,WA 98195, USA. NR 26 TC 139 Z9 146 U1 0 U2 2 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 JUL PY 1993 VL 34 IS 7 BP 1031 EP 1036 PG 6 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA LL238 UT WOS:A1993LL23800006 PM 7686217 ER PT J AU LLACER, J VEKLEROV, E BAXTER, LR GRAFTON, ST GRIFFETH, LK HAWKINS, RA HOH, CK MAZZIOTTA, JC HOFFMAN, EJ METZ, CE AF LLACER, J VEKLEROV, E BAXTER, LR GRAFTON, ST GRIFFETH, LK HAWKINS, RA HOH, CK MAZZIOTTA, JC HOFFMAN, EJ METZ, CE TI RESULTS OF A CLINICAL RECEIVER OPERATING CHARACTERISTIC STUDY COMPARING FILTERED BACKPROJECTION AND MAXIMUM-LIKELIHOOD ESTIMATOR IMAGES IN FDG PET STUDIES SO JOURNAL OF NUCLEAR MEDICINE LA English DT Article ID POSITRON-EMISSION TOMOGRAPHY; RECONSTRUCTION ALGORITHM; EM ALGORITHM; QUANTITATION; ROC AB The results of a receiver operator characteristic (ROC) study comparing maximum likelihood estimator (MLE) reconstructions of human FDG PET brain scan data to filtered backprojection reconstructions of the same data are reported. The purpose of the study was to determine whether MLE reconstructions would result in higher detectability of small focal lesions introduced artificially into otherwise normal scan data. One physician assisted in defining the location and intensity of the lesions and five physicians read the final images. Data from 90 datasets were used for the study. Of those, 42 were left in their original ''normal'' condition and 48 were modified by added lesions. All datasets were reconstructed by the two methods and submitted to the five physicians for evaluation. The results show an increase in the area under the ROC curve from approximately 0.65 for filtered backprojection to approximately 0.71 for the maximum likelihood reconstructions for four of the five observers with good statistical significance. C1 UNIV CALIF LOS ANGELES, SCH MED, DEPT NEUROL, LOS ANGELES, CA USA. WASHINGTON UNIV, MED CTR, MALLINCKRODT INST RADIOL, ST LOUIS, MO 63130 USA. UNIV CALIF LOS ANGELES, SCH MED, DIV NUCL MED, LOS ANGELES, CA USA. UNIV CALIF LOS ANGELES, NUCL MED LAB, LOS ANGELES, CA USA. UNIV SO CALIF, DEPT NEUROL, LOS ANGELES, CA 90089 USA. UNIV SO CALIF, DEPT RADIOL, LOS ANGELES, CA 90089 USA. UNIV CHICAGO, DEPT RADIOL, CHICAGO, IL 60637 USA. RP LLACER, J (reprint author), LAWRENCE BERKELEY LAB, DIV ENGN, BLDG 46A, BERKELEY, CA 94720 USA. FU NCI NIH HHS [CA-39531]; NIMH NIH HHS [MH-37916]; NINDS NIH HHS [NS-15654] NR 26 TC 55 Z9 55 U1 0 U2 1 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 20190-5316 USA SN 0161-5505 EI 1535-5667 J9 J NUCL MED JI J. Nucl. Med. PD JUL PY 1993 VL 34 IS 7 BP 1198 EP 1203 PG 6 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA LL238 UT WOS:A1993LL23800034 PM 8315502 ER PT J AU BOHM, APW HIROMOTO, RE AF BOHM, APW HIROMOTO, RE TI THE DATA-FLOW TIME AND SPACE COMPLEXITY OF FFTS SO JOURNAL OF PARALLEL AND DISTRIBUTED COMPUTING LA English DT Article C1 LOS ALAMOS NATL LAB,COMP RES & APPLICAT GRP,LOS ALAMOS,NM 87545. RP BOHM, APW (reprint author), COLORADO STATE UNIV,DEPT COMP SCI,FT COLLINS,CO 80523, USA. NR 18 TC 1 Z9 1 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 0743-7315 J9 J PARALLEL DISTR COM JI J. Parallel Distrib. Comput. PD JUL PY 1993 VL 18 IS 3 BP 301 EP 313 DI 10.1006/jpdc.1993.1066 PG 13 WC Computer Science, Theory & Methods SC Computer Science GA LP520 UT WOS:A1993LP52000003 ER PT J AU LYLE, PA KOLACZKOWSKI, SV SMALL, GJ AF LYLE, PA KOLACZKOWSKI, SV SMALL, GJ TI PHOTOCHEMICAL HOLE-BURNED SPECTRA OF PROTONATED AND DEUTERATED REACTION CENTERS OF RHODOBACTER-SPHAEROIDES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID PHOTOSYNTHETIC REACTION CENTERS; BACTERIAL REACTION CENTERS; PRIMARY ELECTRON-TRANSFER; ENERGY-TRANSFER DYNAMICS; RHODOPSEUDOMONAS-VIRIDIS; CHARGE SEPARATION; ANTENNA COMPLEX; DONOR STATE; EXCITED-STATE; SPECTROSCOPY AB Photochemical hole-burned spectra with improved signal-to-noise ratio (X20) are reported for the protonated and deuterated reaction center of the purple bacterium Rhodobacter sphaeroides. Spectra obtained as a function of burn frequency (omega(B)) establish that the lifetime of P870*, the primary electron-donor state, is invariant to location of omega(B) within the inhomogeneous distribution of P870 zero-phonon line transition frequencies. For both the protonated and deuterated RC, which exhibit P870 absorption widths at 4.2 K of only 440 and 420 cm-1, the zero-phonon holes yield a lifetime of 0.93 +/- 0. 10 ps. This lifetime is independent of temperature between 1.6 and 8.0 K (range over which the zero-phonon hole could be studied). The invariance of the P870* lifetime to omega(B) and other data indicates that the nonexponential decay of P870* (Vos et al. Proc. Natl. Acad. Sci. U.S.A. 1991, 88, 8885) is due neither to a distribution of values from the electronic coupling matrix element associated with electron transfer, which one might expect from the normal glasslike structural heterogeneity of the RC, nor to gross heterogeneity. The higher quality of the hole spectra has allowed for more stringent testing of the theoretical model previously used to simulate the P870 hole profiles and absorption spectrum. Although the essential findings reported earlier (see, e.g., Reddy et al. Photosyn. Res. 1992, 31, 167) are not altered, it is concluded that the modeling of the distribution of low-frequency phonons (mean frequency approximately 30 cm-1), which couples to P870*, in terms of a Debye distribution is inadequate. The anomalous low-frequency modes of glasses and polymers are suggested to be important also for proteins. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 59 TC 100 Z9 101 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 JUL 1 PY 1993 VL 97 IS 26 BP 6924 EP 6933 DI 10.1021/j100128a030 PG 10 WC Chemistry, Physical SC Chemistry GA LV441 UT WOS:A1993LV44100030 ER PT J AU REDDY, NRS KOLACZKOWSKI, SV SMALL, GJ AF REDDY, NRS KOLACZKOWSKI, SV SMALL, GJ TI NONPHOTOCHEMICAL HOLE-BURNING OF THE REACTION-CENTER OF RHODOPSEUDOMONAS-VIRIDIS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID PHOTOSYNTHETIC REACTION CENTERS; ENERGY-TRANSFER DYNAMICS; RHODOBACTER-SPHAEROIDES; LOW-TEMPERATURE; ELECTRONIC-STRUCTURE; THEORETICAL-EXAMINATION; POLYVINYL-ALCOHOL; OPTICAL-SPECTRA; ANTENNA COMPLEX; 3A RESOLUTION AB Reddy et al. (Science, accepted) have reported persistent, nonphotochemical hole-burned (NPHB) spectra for the Q(y) states of the reaction center of Rhodopseudomonas viridis. The photoinduced structural transformation was shown to be highly localized on the special pair. This transformation leads to a red shift of the special pair's lowest-energy absorption band, P960, of 150 cm-1 and a comparable blue shift for a state at 850 nm, which, as a consequence, could be assigned as being most closely associated with the upper dimer component. Additional experimental results are presented here together with a theoretical analysis of the extent to which the NPHB spectra provide information on the contribution from the bacteriochlorophyll monomers of the special pair to the Q(y) states that absorb higher in energy than P960. Structured photochemical hole-burned (PHB) spectra of P960 are also presented that underscore the importance of strong electron-phonon coupling from a broad distribution of modes with a mean frequency of 30 cm-1 for an understanding of the P960 absorption profile. These spectra also identify the zero-phonon hole of the strongly damped special pair marker mode (145 cm-1) and its associated phonon sideband structure. Calculated spectra are presented which are in good agreement with the experimental PHB spectra. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 36 TC 55 Z9 55 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 JUL 1 PY 1993 VL 97 IS 26 BP 6934 EP 6940 DI 10.1021/j100128a031 PG 7 WC Chemistry, Physical SC Chemistry GA LV441 UT WOS:A1993LV44100031 ER PT J AU BUTLERMOORE, K HAMILTON, JH RAMAYYA, AV ZHUT, S ZHAO, X MA, WC KORMICKI, J DENG, JK GAO, WB COLE, JD ARYAHEINEJAD, R LEE, IY JOHNSON, NR MCGOWAN, FK TERAKOPIAN, G OGANESSIAN, Y AF BUTLERMOORE, K HAMILTON, JH RAMAYYA, AV ZHUT, S ZHAO, X MA, WC KORMICKI, J DENG, JK GAO, WB COLE, JD ARYAHEINEJAD, R LEE, IY JOHNSON, NR MCGOWAN, FK TERAKOPIAN, G OGANESSIAN, Y TI LEVELS IN TE-136 AND NEW HIGH-SPIN STATES IN NEUTRON-RICH N = 84 ISOTONES SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Letter ID DEFORMATION; REGION AB Excited states have been identified for the first time in the neutron-rich nuclide 136Te by observing prompt gamma-rays from Cf-252 spontaneous fission fragments. The technique of triple gamma-ray coincidences was used for the first time in a spontaneous fission study to identify 136Te. In addition, new high-spin states in N = 84 ... 138Xe (12+) and Ba-140 (8+) and N = 86 140Xe (10+) have been observed. These provide the first high-spin yrast band systematics for the N = 84 isotones. C1 IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. JOINT INST NUCL RES,GN FLEROV NUCL REACT LAB,DUBNA,RUSSIA. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP BUTLERMOORE, K (reprint author), VANDERBILT UNIV,DEPT PHYS,NASHVILLE,TN 37235, USA. NR 7 TC 14 Z9 14 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD JUL PY 1993 VL 19 IS 7 BP L121 EP L126 DI 10.1088/0954-3899/19/7/004 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA LN982 UT WOS:A1993LN98200004 ER PT J AU JOHNSON, RW AF JOHNSON, RW TI PREDICTION OF TURBULENT COAXIAL STREAMS OF CONSTANT AND VARIABLE-DENSITY SO JOURNAL OF PROPULSION AND POWER LA English DT Article ID FLOWS; JETS; MOMENTUM; SWIRL; MODEL; HEAT AB The present study investigates the accuracy of well-known turbulence models in simulating the mean velocity, turbulence, and concentration fields for the cases of constant and variable density, turbulent, low Mach number, isothermal, confined coaxial streams of different bulk mean velocities, or axisymmetric mixing layers. The standard k approximately epsilon eddy viscosity model and an anisotropic thin shear algebraic stress model (ASM) are employed for the constant density case. Results for the k approximately epsilon model are determined to be qualitatively satisfactory and superior to those for the thin shear ASM, though both show excessive radial diffusion of axial momentum. Based on these conclusions, the k approximately epsilon model, extended for variable density, is used for numerical simulations of a similar flow where the inner stream gas has a density four times that of the outer stream gas. Simulations for the velocity using the k approximately epsilon model are again found to be qualitatively accurate. Predictions for the concentration field, however, are in good agreement with the data. The flow fields studied are idealizations of a particular configuration once proposed for a gas core reactor (GCR) nuclear propulsion engine. Nuclear propulsion for space travel, once considered in the 1960s and early 1970s, is being reconsidered, especially for manned interplanetary travel. RP JOHNSON, RW (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 28 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0748-4658 J9 J PROPUL POWER JI J. Propul. Power PD JUL-AUG PY 1993 VL 9 IS 4 BP 588 EP 596 DI 10.2514/3.23662 PG 9 WC Engineering, Aerospace SC Engineering GA LN143 UT WOS:A1993LN14300012 ER PT J AU ABDALLAH, J CLARK, REH KEANE, CJ SHEPARD, TD SUTER, LJ AF ABDALLAH, J CLARK, REH KEANE, CJ SHEPARD, TD SUTER, LJ TI RADIATION-FIELD EFFECTS ON THE SPECTROSCOPIC PROPERTIES OF SEEDED PLASMAS SO JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER LA English DT Article AB The presence of an external radiation field can affect the level populations that occur in a high-temperature plasma. The level populations determine, in part, the emissivity of the medium. Hence, processes induced by the radiation field must be included in spectral simulations. In the present paper, the effect of black body radiation with temperatures of several hundred eV on mid-Z seeded plasmas, with electron temperature between 100 and 4000 eV, and electron densities between 10(19) and 10(22) cm-3 is studied. Particular attention is focused on line ratios which are commonly used for diagnostics. It is shown that the radiation field can have significant impact on the spectroscopic properties of plasmas under these conditions. A possible electron temperature diagnostic using iron is suggested for moderate radiation temperatures. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. RP ABDALLAH, J (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,T-4,MAIL STOP B212,LOS ALAMOS,NM 87545, USA. NR 13 TC 13 Z9 13 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-4073 J9 J QUANT SPECTROSC RA JI J. Quant. Spectrosc. Radiat. Transf. PD JUL PY 1993 VL 50 IS 1 BP 91 EP 101 DI 10.1016/0022-4073(93)90132-2 PG 11 WC Optics; Spectroscopy SC Optics; Spectroscopy GA LJ391 UT WOS:A1993LJ39100010 ER PT J AU STEVENSON, KA AF STEVENSON, KA TI ELEMENT PROFILES OF MOUSE HAIR - A CONCERN FOR USING HAIR AS A TIMETABLE REPOSITORY SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Article AB Element profile patterns of growth and nongrowth phase hair were obtained for the C57L/J male mouse using a proton microprobe. Growth phase hair profiles of Cl, S, K and P show that these elements are concentrating in regions of higher pigmentation. Calcium is restricted to the medulla region in the hair shaft. For nongrowth phase hair, the profiles of Cl and S are essentially unchanged, whereas K and P are depleted in the hair shaft and are concentrating in the cornified root sheath. The element patterns found for the nongrowth phase profiles of mouse hair show striking similarities to previously reported patterns for growth phase profiles of human hair. RP STEVENSON, KA (reprint author), US DOE,ENVIRONM MEASUREMENTS LAB,376 HUDSON ST,NEW YORK,NY 10014, USA. NR 10 TC 0 Z9 0 U1 0 U2 1 PU AKADEMIAI KIADO PI BUDAPEST PA PO BOX 245, H-1519 BUDAPEST, HUNGARY SN 0236-5731 J9 J RADIOAN NUCL CH AR JI J. Radioanal. Nucl. Chem.-Artic. PD JUL PY 1993 VL 171 IS 2 BP 365 EP 370 DI 10.1007/BF02219860 PG 6 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA LQ672 UT WOS:A1993LQ67200008 ER PT J AU TAKAHASHI, K FUJINO, T MORSS, LR AF TAKAHASHI, K FUJINO, T MORSS, LR TI CRYSTAL-CHEMICAL AND THERMODYNAMIC STUDY ON CAUO4-X, (CA0.5SR0.5)UO4-X, AND ALPHA-SRUO4-X (X = 0 SIMILAR-TO 0.5) SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article ID UO2+X C1 JAPAN ATOM ENERGY RES INST,DEPT CHEM,TOKAI,IBARAKI 31911,JAPAN. TOHOKU UNIV,INST ADV MAT PROC,AOBA KU,SENDAI,MIYAGI 980,JAPAN. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. NR 36 TC 16 Z9 16 U1 9 U2 12 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD JUL PY 1993 VL 105 IS 1 BP 234 EP 246 DI 10.1006/jssc.1993.1211 PG 13 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA LP634 UT WOS:A1993LP63400024 ER PT J AU RUNDLE, JB KLEIN, W AF RUNDLE, JB KLEIN, W TI SCALING AND CRITICAL PHENOMENA IN A CELLULAR AUTOMATION SLIDER-BLOCK MODEL FOR EARTHQUAKES SO JOURNAL OF STATISTICAL PHYSICS LA English DT Article DE EARTHQUAKES; FAULTS; SPINODAL; NUCLEATION; SCALING; CRITICAL PHENOMENA ID SELF-ORGANIZED CRITICALITY; DYNAMICS; FAULT AB The dynamics of a general class of two-dimensional cellular automaton slider-block models of earthquake faults is studied as a function of the failure rules that determine slip and the nature of the failure threshold. Scaling properties of clusters of failed sites imply the existence of a mean-field spinodal line in systems with spatially random failure thresholds, whereas spatially uniform failure thresholds produce behavior reminiscent of self-organized critical behavior. This model can describe several classes of faults, ranging from those that only exhibit creep to those that produce large events. C1 BOSTON UNIV,CTR POLYMER STUDIES,BOSTON,MA 02215. BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215. RP RUNDLE, JB (reprint author), LAWRENCE LIVERMORE NATL LAB,L-202,LIVERMORE,CA 94550, USA. NR 21 TC 53 Z9 55 U1 0 U2 4 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-4715 J9 J STAT PHYS JI J. Stat. Phys. PD JUL PY 1993 VL 72 IS 1-2 BP 405 EP 412 DI 10.1007/BF01048056 PG 8 WC Physics, Mathematical SC Physics GA LT317 UT WOS:A1993LT31700020 ER PT J AU KVAM, PH SAMANIEGO, FJ AF KVAM, PH SAMANIEGO, FJ TI ON THE INADMISSIBILITY OF EMPIRICAL AVERAGES AS ESTIMATORS IN RANKED SET SAMPLING SO JOURNAL OF STATISTICAL PLANNING AND INFERENCE LA English DT Article DE ADMISSIBILITY; ESTIMATIONS; ORDER STATISTICS; RELIABILITY AB A ranked set sample (rss) consists entirely of independently distributed order statistics, and can occur naturally in many experimental settings, including problems in reliability. When each ranked set from which an order statistic is drawn is of the same size, and when the statistic of each fixed order is sampled the same number of times, the ranked set sample is said to be balanced. The mean X(rss)BAR of a balanced ranked set sample is known to be an unbiased estimator of the population mean mu, and its variance has been shown to be less than or equal to that of the mean X(srs)BAR of a simple random sample (srs) of the same size. Similarly, it has been shown that the empirical distribution function (edf) F(rss) of a balanced ranked set sample is superior to the edf F(srs) based on a simple random sample of the same size. The present study investigates the admissibility of X(rss)BAR and F(rss), with the main results being as follows. When mu is either a scale or location parameter of the underlying distribution, it is possible to construct estimators which uniformly improve upon X(rss)BAR relative to squared error loss. In the general nonparametric estimation problem, F(rss) is shown to be inadmissible relative to integrated squared error loss. Our alternative estimators have an additional virtue: in contrast with X(rss)BAR and F(rss), the new estimators extend naturally to the unbalanced case, and enjoy certain optimality properties in this broader setting. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. UNIV CALIF DAVIS,DIV STAT,DAVIS,CA 95616. NR 16 TC 26 Z9 26 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3758 J9 J STAT PLAN INFER JI J. Stat. Plan. Infer. PD JUL PY 1993 VL 36 IS 1 BP 39 EP 55 DI 10.1016/0378-3758(93)90100-K PG 17 WC Statistics & Probability SC Mathematics GA LM544 UT WOS:A1993LM54400004 ER PT J AU CHAO, TC BLEND, MJ LOPES, AD ATCHER, RW DASGUPTA, TK GREAGER, JA AF CHAO, TC BLEND, MJ LOPES, AD ATCHER, RW DASGUPTA, TK GREAGER, JA TI LOCALIZATION OF SARCOMA XENOGRAFTS IN NUDE-MICE WITH INDIUM-111-LABELED MONOCLONAL-ANTIBODIES SO JOURNAL OF SURGICAL RESEARCH LA English DT Article ID HUMAN-TUMOR XENOGRAFTS; BIODISTRIBUTION; SPECIFICITY; IN-111 C1 HEKTOEN INST MED RES,CHICAGO,IL 60612. MICHAEL REESE HOSP & MED CTR,DIV NUCL MED,CHICAGO,IL 60616. CYTOGEN CORP,PRINCETON FORRESTAL CTR,PRINCETON,NJ 08540. ARGONNE NATL LAB,ARGONNE,IL 60439. RP CHAO, TC (reprint author), UNIV ILLINOIS,COOK CTY HOSP,COLL MED,DEPT SURG,DIV SURG ONCOL,CHICAGO,IL 60612, USA. OI Atcher, Robert/0000-0003-4656-2247 NR 22 TC 0 Z9 0 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 0022-4804 J9 J SURG RES JI J. Surg. Res. PD JUL PY 1993 VL 55 IS 1 BP 38 EP 43 DI 10.1006/jsre.1993.1105 PG 6 WC Surgery SC Surgery GA MB174 UT WOS:A1993MB17400006 PM 8412080 ER PT J AU WEBER, WJ AF WEBER, WJ TI ALPHA-DECAY-INDUCED AMORPHIZATION IN COMPLEX SILICATE STRUCTURES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID SELF-RADIATION DAMAGE; DISORDER PRODUCTION; COMPOSITE MODEL; RECOIL DAMAGE; ZIRCON; ACCUMULATION; CA2ND8(SIO4)6O2; SEMICONDUCTORS; AMORPHOUSNESS; IMPLANTATION AB Alpha decay in Cm-doped Ca2Nd8(SiO4)6O2, Pu-doped ZrSiO4, and natural ZrSiO4 minerals results in the simultaneous accumulation of point defects and amorphous regions that both contribute to the macroscopic swelling. A composite model for the macroscopic swelling is used to determine the amorphous fraction as a function of cumulative alpha-decay events. The dependence of the derived amorphous fraction in Ca2Nd8(SiO4)6O2 on cumulative alpha-decay events is consistent with amorphization occurring directly within an individual displacement cascade. In ZrSiO4, on the other hand, the rate of amorphization is lower and the derived amorphous fraction as a function of cumulative alpha-decay events is consistent with models for amorphization occurring as a result of the local accumulation of high-defect concentrations from the multiple overlapping of displacement cascades. RP WEBER, WJ (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. RI Weber, William/A-4177-2008 OI Weber, William/0000-0002-9017-7365 NR 42 TC 88 Z9 90 U1 1 U2 8 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD JUL PY 1993 VL 76 IS 7 BP 1729 EP 1738 DI 10.1111/j.1151-2916.1993.tb06641.x PG 10 WC Materials Science, Ceramics SC Materials Science GA LZ493 UT WOS:A1993LZ49300011 ER PT J AU RAHAMAN, MN DEJONGHE, LC AF RAHAMAN, MN DEJONGHE, LC TI REACTION SINTERING OF ZINC FERRITE DURING CONSTANT RATES OF HEATING SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID DENSIFICATION AB The reaction sintering of equimolar quantities of zinc oxide and ferric oxide was investigated under conditions of constant rates of heating (1-10-degrees-C/min from room temperature to 1350-degrees-C) and the data were compared with those for a calcined, single-phase zinc ferrite powder. For the heating rate of 1-degrees-C/min, the densifications of the reaction-sintered sample and the calcined sample were approximately the same. However, as the heating rate increased, the density at any temperature increased slightly for the reaction-sintered sample but decreased slightly for the calcined powder. The factors responsible for this slight difference in sintering between the reaction-sintered sample and the calcined sample are discussed. For the constant heating rates used, the reaction was completed prior to any significant densification. Relative densities of >95% were obtained for both the reaction-sintered sample and the calcined sample under identical sintering conditions (1-10-degrees-C/min to 1350-degrees-C). Reaction sintering in a steep temperature gradient produced a nearly fully dense body prior to complete reaction; a composite microstructure consisting of fine zinc oxide grains in a matrix of zinc ferrite was obtained. C1 LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP RAHAMAN, MN (reprint author), UNIV MISSOURI,DEPT CERAM ENGN,ROLLA,MO 65401, USA. NR 20 TC 25 Z9 27 U1 2 U2 2 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD JUL PY 1993 VL 76 IS 7 BP 1739 EP 1744 DI 10.1111/j.1151-2916.1993.tb06642.x PG 6 WC Materials Science, Ceramics SC Materials Science GA LZ493 UT WOS:A1993LZ49300012 ER PT J AU WINGER, BE LIGHTWAHL, KJ LOO, RRO UDSETH, HR SMITH, RD AF WINGER, BE LIGHTWAHL, KJ LOO, RRO UDSETH, HR SMITH, RD TI OBSERVATION AND IMPLICATIONS OF HIGH MASS-TO-CHARGE RATIO IONS FROM ELECTROSPRAY-IONIZATION MASS-SPECTROMETRY SO JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY LA English DT Article ID PROTEINS; SPECTRA; EVAPORATION; INTERFACE; MOLECULES; COMPLEXES; SPRAY AB High mass-to-charge ratio ions (> 4000) from electrospray ionization (ESI) have been observed for several proteins, including bovine cytochrome c (M(r) 12,231) and porcine pepsin (M(r) 34,584), by using a quadrupole mass spectrometer with an m/z 45,000 range. The ESI mass spectrum for cytochrome c in an aqueous solution gives a charge state distribution that ranges from 12 + to 2 + , with a broad, low-intensity peak in the mass-to-charge ratio region corresponding to the [M + H]+ ion. The negative ion ESI mass spectrum for pepsin in 1% acetic acid solution shows a charge state distribution ranging from 7 - to 2 -. To observe the [M - H]- ion, harsher desolvation and interface conditions were required. Also observed was the abundant aggregation of the proteins with average charge states substantially lower than observed for their monomeric counterparts. The negative ion ESI mass spectrum for cytochrome c in 1-100 mM NH4OAc solutions showed greater relative abundances for the higher mass-to-charge ratio ions than in acidic solutions, with an [M - H]- ion relative abundance approximately 50% that of the most abundant charge state peak. The observation that protein aggregates are formed with charge states comparable to monomeric species (at lower mass-to-charge ratios) suggests that the high mass-to-charge ratio monomers may be formed by the dissociation of aggregate species. The observation of low charge state and aggregate molecular ions concurrently with highly charged species may serve to support a variation of the charged residue model, originally described by Dole and co-workers (Dole, M., et al. J. Chem. Phys. 1968, 49, 2240; Mack, L. L., et al. J. Chem. Phys. 1970, 52, 4977), which involves the Coulombically driven formation of either very highly solvated molecular ions or lower nanometer-diameter droplets. C1 PACIFIC NW LAB, DEPT CHEM SCI, CHEM METHODS & SEPARAT GRP,POB 999, RICHLAND, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 42 TC 83 Z9 84 U1 0 U2 25 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 JUL PY 1993 VL 4 IS 7 BP 536 EP 545 DI 10.1016/1044-0305(93)85015-P PG 10 WC Chemistry, Analytical; Chemistry, Physical; Spectroscopy SC Chemistry; Spectroscopy GA LM058 UT WOS:A1993LM05800003 PM 24227640 ER PT J AU WINGER, BE HOFSTADLER, SA BRUCE, JE UDSETH, HR SMITH, RD AF WINGER, BE HOFSTADLER, SA BRUCE, JE UDSETH, HR SMITH, RD TI HIGH-RESOLUTION ACCURATE MASS MEASUREMENTS OF BIOMOLECULES USING A NEW ELECTROSPRAY-IONIZATION ION-CYCLOTRON RESONANCE MASS-SPECTROMETER SO JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY LA English DT Article ID CAPILLARY ZONE ELECTROPHORESIS; MULTIPLY CHARGED IONS; CONFORMATIONAL-CHANGES; LARGE MOLECULES; PENNING TRAP; UBIQUITIN; SPECTRA; TIME; FTMS; CELL AB A novel electrospray ionization/Fourier transform ion cyclotron resonance mass spectrometer based on a 7-T superconducting magnet was developed for high-resolution accurate mass measurements of large biomolecules. Ions formed at atmospheric pressure using electrospray ionization (ESI) were transmitted (through six differential pumping stages) to the trapped ion cell maintained below 10(-9) torr. The increased pumping speed attainable with cryopumping (> 10(5) L/s) allowed brief pressure excursions to above 10(-4) torr, with greatly enhanced trapping efficiencies and subsequent short pumpdown times, facilitating high-resolution mass measurements. A set of electromechanical shutters were also used to minimize the effect of the directed molecular beam produced by the ESI source and were open only during ion injection. Coupled with the use of the pulsed-valve gas inlet, the trapped ion cell was generally filled to the space charge limit within 100 ms. The use of 10-25 ms ion injection times allowed mass spectra to be obtained from 4 fmol of bovine insulin (M(r) 5734) and ubiquitin (M(r) 8565), with resolution sufficient to easily resolve the isotopic envelopes and determine the charge states. The microheterogeneity of the glycoprotein ribonuclease B was examined, giving a measured mass of 14,898.74 Da for the most abundant peak in the isotopic envelope of the normally glycosylated protein (i.e., with five mannose and two N-acetylglucosamine residues (an error of approximately 2 ppm) and an average error of approximately 1 ppm for the higher glycosylated and various H3PO4 adducted forms of the protein. Time-domain signals lasting in excess of 80 s were obtained for smaller proteins, producing, for example, a mass resolution of more than 700,000 for the 4+ charge state (m/z 1434) of insulin. C1 PACIFIC NW LAB, DEPT CHEM SCI, CHEM METHODS & SEPARAT GRP,POB 999, MS P8-19, RICHLAND, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 61 TC 171 Z9 171 U1 0 U2 6 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 JUL PY 1993 VL 4 IS 7 BP 566 EP 577 DI 10.1016/1044-0305(93)85018-S PG 12 WC Biochemical Research Methods; Chemistry, Analytical; Chemistry, Physical; Spectroscopy SC Biochemistry & Molecular Biology; Chemistry; Spectroscopy GA LM058 UT WOS:A1993LM05800006 PM 24227643 ER PT J AU LESSNER, PM MCLARNON, FR WINNICK, J CAIRNS, EJ AF LESSNER, PM MCLARNON, FR WINNICK, J CAIRNS, EJ TI THE DEPENDENCE OF AQUEOUS SULFUR-POLYSULFIDE REDOX POTENTIAL ON ELECTROLYTE-COMPOSITION AND TEMPERATURE SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID HYDROGEN-SULFIDE; DISSOCIATION-CONSTANT; OPTICAL-SPECTRA; EQUILIBRIUM; IONS AB Literature data for the redox potential of the aqueous sulfur-polysulfide redox couple have been correlated by accounting for the complex equilibration of various sulfur-bearing species in alkaline electrolyte. For electrolytes wherein the ratio of zero-valent sulfur to total sulfide ranges from 0. 1 to 3.0, the pH ranges from 10.6 to 13.8, and the temperature ranges from 25 to 90-degrees-C, the redox potential is correlated by the expression E = E-degrees - RT/6F ln(C-HS-(4)C-OH-(4)/C(S-4(2-)) This equation represents the redox potentials to within 2 % at all compositions and temperatures, except for the electrolyte with a sulfur/sulfide ratio of 3.0 at 80-degrees-C, for which the deviation is 6%. C1 LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. RI Cairns, Elton/E-8873-2012 OI Cairns, Elton/0000-0002-1179-7591 NR 18 TC 18 Z9 18 U1 0 U2 15 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 JUL PY 1993 VL 140 IS 7 BP 1847 EP 1849 DI 10.1149/1.2220727 PG 3 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA LL842 UT WOS:A1993LL84200012 ER PT J AU ZAWODZINSKI, TA SPRINGER, TE DAVEY, J JESTEL, R LOPEZ, C VALERIO, J GOTTESFELD, S AF ZAWODZINSKI, TA SPRINGER, TE DAVEY, J JESTEL, R LOPEZ, C VALERIO, J GOTTESFELD, S TI A COMPARATIVE-STUDY OF WATER-UPTAKE BY AND TRANSPORT THROUGH IONOMERIC FUEL-CELL MEMBRANES SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID DIFFUSION AB Water uptake and transport parameters measured at 30-degrees-C for several available perfluorosulfonic acid membranes are compared. The water sorption characteristics, diffusion coefficient of water, electroosmotic drag, and protonic conductivity were determined for Nafion(R) 117, Membrane C, and Dow XUS 13204.10 developmental fuel cell membrane. The diffusion coefficient and conductivity of each of these membranes were determined as functions of membrane water content. Experimental determination of transport parameters, enables us to compare membranes without the skewing effects of extensive features such as membrane thickness which contributes in a nonlinear fashion to performance in polymer electrolyte fuel cells. RP ZAWODZINSKI, TA (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 18 TC 491 Z9 497 U1 2 U2 62 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 JUL PY 1993 VL 140 IS 7 BP 1981 EP 1985 DI 10.1149/1.2220749 PG 5 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA LL842 UT WOS:A1993LL84200034 ER EF