FN Thomson Reuters Web of Science™ VR 1.0 PT J AU ZAK, J MOOG, ER LIU, C BADER, SD AF ZAK, J MOOG, ER LIU, C BADER, SD TI ELEMENTARY FORMULA FOR THE MAGNETOOPTIC KERR EFFECT FROM MODEL SUPERLATTICES - RESPONSE SO APPLIED PHYSICS LETTERS LA English DT Letter RP ZAK, J (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013 NR 4 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 19 PY 1992 VL 61 IS 16 BP 1986 EP 1987 DI 10.1063/1.108492 PG 2 WC Physics, Applied SC Physics GA JT884 UT WOS:A1992JT88400039 ER PT J AU DRAGULESCU, E IVASCU, M PETRACHE, C POPESCU, D SEMENESCU, G GURGU, I IONESCUBUJOR, M IORDACHESCU, A PASCOVICI, G MEYER, RA LOPAC, V BRANT, S PAAR, V VORKAPIC, D VRETENAR, D AF DRAGULESCU, E IVASCU, M PETRACHE, C POPESCU, D SEMENESCU, G GURGU, I IONESCUBUJOR, M IORDACHESCU, A PASCOVICI, G MEYER, RA LOPAC, V BRANT, S PAAR, V VORKAPIC, D VRETENAR, D TI NUCLEAR-STRUCTURE AND HIGH-SPIN STATES OF PR-137 SO NUCLEAR PHYSICS A LA English DT Article DE TE-126(N-14,3N), E = 52-56 MEV; SN-122(FE-19,4N) E = 68-76 MEV; MEASURED E(GAMMA),I(GAMMA),SIGMA(E,E(GAMMA),THETA)(GAMMA); GAMMA-GAMMA(T))X-GAMMA(T),GAMMA(T); PR-137 DEDUCED LEVELS, J, PI,DELTA(E2/M1); T(1/2); ENRICHED TARGETS; GE(LI) DETECTORS, PR-137 CALCULATED LEVELS; IBFM ID ODD-MASS NUCLEI; LEVEL STRUCTURE; A NUCLEI; MODEL; TRANSITION; REGION; LA-133; LIMIT AB Levels in Pr-137 were populated in the Te-126(N-14, 3n) and Sn-122(F-19,4n) reactions and the subsequent radiation was studied using in-beam gamma-ray spectroscopy methods including gamma-ray excitation-function, angular-distribution, gammagamma(t) coincidence and gamma(t) measurements. A level scheme with new states up to spin 35/2 belonging to Pr-137 is given. The lifetime of the 11-/21 state at 563.4 keV has been determined as T1/2 = 2.66+/-0.07 mus. The calculation of low-lying levels in Pr-137 performed in IBFM has been compared to experimental data. C1 UNIV ZAGREB,FAC SCI,DEPT PHYS,YU-41000 ZAGREB,YUGOSLAVIA. INST ATOM PHYS,BUCHAREST,ROMANIA. MONTGOMERY COLL,TAKOMA PK,MD. UNIV ZAGREB,FAC TECHNOL,YU-41000 ZAGREB,YUGOSLAVIA. US DOE,DIV NUCL PHYS,WASHINGTON,DC 20585. RI Petrache, Costel/E-9867-2012; Vretenar, Dario/N-8158-2013; Paar, Vladimir/D-8009-2015 OI Petrache, Costel/0000-0001-8419-1390; Vretenar, Dario/0000-0002-2097-6567; NR 42 TC 8 Z9 8 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 OCT 19 PY 1992 VL 548 IS 3 BP 435 EP 452 DI 10.1016/0375-9474(92)90694-F PG 18 WC Physics, Nuclear SC Physics GA JV878 UT WOS:A1992JV87800007 ER PT J AU STRASSLER, MJ AF STRASSLER, MJ TI FIELD-THEORY WITHOUT FEYNMAN DIAGRAMS - ONE-LOOP EFFECTIVE ACTIONS SO NUCLEAR PHYSICS B LA English DT Article ID MULTI-GLUON SCATTERING; GAUGE-THEORIES; QCD AMPLITUDES; STRINGS; SUPERSYMMETRY AB In this paper the connection between standard perturbation theory techniques and the new Bern-Kosower calculational rules for gauge theory is clarified. For one-loop effective actions of scalars, Dirac spinors, and vector bosons in a background gauge field, Bern-Kosower type rules are derived without the use of either string theory or Feynman diagrams. The effective action is written as a one-dimensional path integral, which can be calculated to any order in the gauge coupling; evaluation leads to Feynman parameter integrals directly, bypassing the usual algebra required from Feynman diagrams, and leading to compact and organized expressions. This formalism is valid off-shell, is explicitly gauge invariant, and can be extended to a number of other field theories. RP STRASSLER, MJ (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 48 TC 275 Z9 275 U1 0 U2 3 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 OCT 19 PY 1992 VL 385 IS 1-2 BP 145 EP 184 DI 10.1016/0550-3213(92)90098-V PG 40 WC Physics, Particles & Fields SC Physics GA JY885 UT WOS:A1992JY88500005 ER PT J AU LAZARUS, DM SMITH, GC CAMERON, R MELISSINOS, AC RUOSO, G SEMERTZIDIS, YK NEZRICK, FA AF LAZARUS, DM SMITH, GC CAMERON, R MELISSINOS, AC RUOSO, G SEMERTZIDIS, YK NEZRICK, FA TI SEARCH FOR SOLAR AXIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID CP CONSERVATION; SINGLE PHOTONS; COSMIC AXIONS; GAMMA-DECAY; PARTICLES; INVARIANCE; LIMITS; BOSON AB We have searched for a flux of axions produced in the Sun by exploiting their conversion to x rays in a static magnetic field. The signature of a solar axion flux would be an increase in the rate of x rays detected in a magnetic telescope when the Sun passes within its acceptance. From the absence of such a signal we set a 3sigma limit on the axion coupling to two photons g(alphagammagamma) = 1/M < 3.6 x 10(-9) GeV-1, provided the axion mass m(alpha) < 0.03 eV, and < 7.7 x 10(-9) GeV-1 for 0.03 < m(alpha) < 0.11 eV. C1 UNIV ROCHESTER,DEPT PHYS & ASTRON,ROCHESTER,NY 14627. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP LAZARUS, DM (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Semertzidis, Yannis K./N-1002-2013; Ruoso, Giuseppe/G-3075-2015 OI Ruoso, Giuseppe/0000-0001-8140-9382 NR 32 TC 101 Z9 101 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 19 PY 1992 VL 69 IS 16 BP 2333 EP 2336 DI 10.1103/PhysRevLett.69.2333 PG 4 WC Physics, Multidisciplinary SC Physics GA JT980 UT WOS:A1992JT98000006 ER PT J AU ARMSTRONG, TA BETTONI, D BHARADWAJ, V BIINO, C BORREANI, G BROEMMELSIEK, D BUZZO, A CALABRESE, R CECCUCCI, A CESTER, R CHURCH, M DALPIAZ, P DALPIAZ, PF DIBENEDETTO, R DIMITROYANNIS, D FABBRI, MG FAST, J GIANOLI, A GINSBURG, CM GOLLWITZER, K HAHN, A HASAN, M HSUEH, S LEWIS, R LUPPI, E MACRI, M MAJEWSKA, AM MANDELKERN, M MARCHETTO, F MARINELLI, M MARQUES, J MARSH, W MARTINI, M MASUZAWA, M MENICHETTI, E MIGLIORI, A MUSSA, R PALESTINI, S PALLAVICINI, M PASTRONE, N PATRIGNANI, C PEOPLES, J PESANDO, L PETRUCCI, F PIA, MG PORDES, S RAPIDIS, P RAY, R REID, J RINAUDO, G ROCCUZZO, B ROSEN, J SANTRONI, A SARMIENTO, M SAVRIE, M SCALISI, A SCHULTZ, J SETH, KK SMITH, A SMITH, GA SOZZI, M TROKENHEIM, S WEBER, MF WERKEMA, S ZHANG, Y ZHAO, J ZIOULAS, G AF ARMSTRONG, TA BETTONI, D BHARADWAJ, V BIINO, C BORREANI, G BROEMMELSIEK, D BUZZO, A CALABRESE, R CECCUCCI, A CESTER, R CHURCH, M DALPIAZ, P DALPIAZ, PF DIBENEDETTO, R DIMITROYANNIS, D FABBRI, MG FAST, J GIANOLI, A GINSBURG, CM GOLLWITZER, K HAHN, A HASAN, M HSUEH, S LEWIS, R LUPPI, E MACRI, M MAJEWSKA, AM MANDELKERN, M MARCHETTO, F MARINELLI, M MARQUES, J MARSH, W MARTINI, M MASUZAWA, M MENICHETTI, E MIGLIORI, A MUSSA, R PALESTINI, S PALLAVICINI, M PASTRONE, N PATRIGNANI, C PEOPLES, J PESANDO, L PETRUCCI, F PIA, MG PORDES, S RAPIDIS, P RAY, R REID, J RINAUDO, G ROCCUZZO, B ROSEN, J SANTRONI, A SARMIENTO, M SAVRIE, M SCALISI, A SCHULTZ, J SETH, KK SMITH, A SMITH, GA SOZZI, M TROKENHEIM, S WEBER, MF WERKEMA, S ZHANG, Y ZHAO, J ZIOULAS, G TI OBSERVATION OF THE (1)P(1) STATE OF CHARMONIUM SO PHYSICAL REVIEW LETTERS LA English DT Article ID HEAVY QUARKONIA; HADRONIC TRANSITIONS; P-1(1) STATES; DECAYS; MODEL; QCD AB We have performed a search for the P-1(1) state of charmonium resonantly formed in ppBAR annihilations, close to the center of gravity of the 3P(J) states. We report results from the study of the J/psi+pi0 and J/psi+2pi final states. We have observed a statistically significant enhancement in the pBAR+p-->J/psi+pi0 cross section at square-root s congruent-to 3526.2 MeV. This enhancement has the characteristics of a narrow resonance of mass, total width, and production cross section consistent with what is expected for the P-1(1) state. In our search we have found no candidates for the reactions pBAR+p-->J/psi+pi0+pi0 and pBAR+p-->J/psi+pi++pi-. C1 UNIV FERRARA,I-44100 FERRARA,ITALY. IST NAZL FIS NUCL,I-44100 FERRARA,ITALY. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. UNIV GENOA,I-16126 GENOA,ITALY. UNIV CALIF IRVINE,IRVINE,CA 92717. NORTHWESTERN UNIV,EVANSTON,IL 60208. PENN STATE UNIV,UNIV PK,PA 16802. UNIV TURIN,I-10126 TURIN,ITALY. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. RP ARMSTRONG, TA (reprint author), FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. RI Pia, Maria Grazia/C-7034-2012; Sozzi, Marco/H-1674-2011; Patrignani, Claudia/C-5223-2009; Luppi, Eleonora/A-4902-2015; Calabrese, Roberto/G-4405-2015; Pallavicini, Marco/G-5500-2012; Gianoli, Alberto/H-5544-2015 OI Pia, Maria Grazia/0000-0002-3579-9639; Sozzi, Marco/0000-0002-2923-1465; Mussa, Roberto/0000-0002-0294-9071; Patrignani, Claudia/0000-0002-5882-1747; Luppi, Eleonora/0000-0002-1072-5633; Calabrese, Roberto/0000-0002-1354-5400; Pallavicini, Marco/0000-0001-7309-3023; Gianoli, Alberto/0000-0002-2456-8667 NR 24 TC 128 Z9 130 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 19 PY 1992 VL 69 IS 16 BP 2337 EP 2340 DI 10.1103/PhysRevLett.69.2337 PG 4 WC Physics, Multidisciplinary SC Physics GA JT980 UT WOS:A1992JT98000007 ER PT J AU AOKI, M BEATTY, J BEAVIS, D CARROLL, JB CHIBA, J CRAWFORD, HJ DEBBE, R DOKE, T ENGELAGE, J GREINER, L HAYANO, RS HALLMAN, TJ HECKMAN, HH KASHIWAGI, T KIKUCHI, J KIRK, PN LINDSTROM, PJ NAGAMIYA, S STANKUS, P TANAKA, KH SHIMIZU, Y WANG, ZF AF AOKI, M BEATTY, J BEAVIS, D CARROLL, JB CHIBA, J CRAWFORD, HJ DEBBE, R DOKE, T ENGELAGE, J GREINER, L HAYANO, RS HALLMAN, TJ HECKMAN, HH KASHIWAGI, T KIKUCHI, J KIRK, PN LINDSTROM, PJ NAGAMIYA, S STANKUS, P TANAKA, KH SHIMIZU, Y WANG, ZF TI MEASUREMENTS AT O-DEGREES OF NEGATIVELY CHARGED-PARTICLES AND ANTINUCLEI PRODUCED IN COLLISION OF 14.6A GEV/C SI ON AL, CU, AND AU TARGETS SO PHYSICAL REVIEW LETTERS LA English DT Article ID HEAVY-ION COLLISIONS; STRANGE-QUARK-MATTER; ANTIDEUTERON PRODUCTION; COALESCENCE MODEL; PHASE-TRANSITION; DROPLETS; EMISSION; SEPARATION; MOMENTUM; STATE AB We report measurements of dBAR, pBAR, K-, and pi- produced at O-degree in collisions of 14.6A GeV/c Si-28 on Al, Cu, and Au targets. A beam-line focusing spectrometer was used to identify particles at rigidities from -2 to -8 GV. The ratio of dBAR/pBAR invariant cross sections at midrapidity (y = 1.7) is (1+/-0.7)x 10(-5), larger than expected from a calculation of ddBAR direct production but smaller than predicted by a simple coalescence model. We also report limits on the production of exotic particles. C1 COLUMBIA UNIV,NEVIS LAB,IRVINGTON,NY 10533. UNIV CALIF BERKELEY,VIROL LAB,BERKELEY,CA 94720. BOSTON UNIV,BOSTON,MA 02215. BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. NATL LAB HIGH ENERGY PHYS,TSUKUBA,JAPAN. WASEDA UNIV,TOKYO 160,JAPAN. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. LOUISIANA STATE UNIV,BATON ROUGE,LA 70803. RP AOKI, M (reprint author), UNIV TOKYO,TOKYO 113,JAPAN. RI Hayano, Ryugo/F-7889-2012; Beatty, James/D-9310-2011 OI Hayano, Ryugo/0000-0002-1214-7806; Beatty, James/0000-0003-0481-4952 NR 39 TC 74 Z9 74 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 19 PY 1992 VL 69 IS 16 BP 2345 EP 2348 DI 10.1103/PhysRevLett.69.2345 PG 4 WC Physics, Multidisciplinary SC Physics GA JT980 UT WOS:A1992JT98000009 ER PT J AU YIN, YY CHEN, C ELLIOTT, DS SMITH, AV AF YIN, YY CHEN, C ELLIOTT, DS SMITH, AV TI ASYMMETRIC PHOTOELECTRON ANGULAR-DISTRIBUTIONS FROM INTERFERING PHOTOIONIZATION PROCESSES SO PHYSICAL REVIEW LETTERS LA English DT Article ID MULTIPHOTON IONIZATION; 2-PHOTON IONIZATION; DYE-LASER; TRANSITIONS; RUBIDIUM; PHASE; FIELD AB We have measured asymmetric photoelectron angular distributions for atomic rubidium. Ionization is induced by a one-photon interaction with 280 nm light and by a two-photon interaction with 560 nm light. Interference between the even- and odd-parity free-electron wave functions allows us to control the direction of maximum electron flux by varying the relative phase of the two laser fields. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP YIN, YY (reprint author), PURDUE UNIV,SCH ELECT ENGN,W LAFAYETTE,IN 47907, USA. NR 22 TC 192 Z9 194 U1 1 U2 9 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 19 PY 1992 VL 69 IS 16 BP 2353 EP 2356 DI 10.1103/PhysRevLett.69.2353 PG 4 WC Physics, Multidisciplinary SC Physics GA JT980 UT WOS:A1992JT98000011 ER PT J AU MACEK, J OVCHINNIKOV, SY AF MACEK, J OVCHINNIKOV, SY TI ANOMALOUS N-DEPENDENCE OF LOW-ENERGY ELECTRON-CAPTURE FROM ATOMIC-HYDROGEN BY MULTICHARGED IONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID CROSS-SECTIONS; COLLISIONS; IONIZATION AB A theory of electron capture from states of high principal quantum number n by multicharged ions is presented. We predict a capture cross section that depends upon the n of the initial state as nn(beta) where beta is as large as 7 in some cases. This surprisingly high n dependence explains why a small (less than 0.1%) fraction of hydrogen in high n states contributes 30% of the capture yield in O5+ + H collisions. The theory also predicts a strong dependence on the dipole moment of the initial state. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. AF IOFFE PHYSICOTECH INST,ST PETERSBURG,USSR. RP MACEK, J (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. RI Ovchinnikov, Serguei/C-4994-2014 NR 11 TC 10 Z9 10 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 19 PY 1992 VL 69 IS 16 BP 2357 EP 2359 DI 10.1103/PhysRevLett.69.2357 PG 3 WC Physics, Multidisciplinary SC Physics GA JT980 UT WOS:A1992JT98000012 ER PT J AU NAGAYAMA, Y SABBAGH, SA MANICKAM, J FREDRICKSON, ED BELL, M BUDNY, RV CAVALLO, A JANOS, AC MAUEL, ME MCGUIRE, KM NAVRATIL, GA TAYLOR, G YAMADA, M AF NAGAYAMA, Y SABBAGH, SA MANICKAM, J FREDRICKSON, ED BELL, M BUDNY, RV CAVALLO, A JANOS, AC MAUEL, ME MCGUIRE, KM NAVRATIL, GA TAYLOR, G YAMADA, M TI OBSERVATION OF BALLOONING MODES IN HIGH-TEMPERATURE TOKAMAK PLASMAS SO PHYSICAL REVIEW LETTERS LA English DT Article ID ELECTRON-CYCLOTRON EMISSION; TFTR; STABILITY; SYSTEM AB The beta-degradation phase of a high-beta(p) plasma in the TFTR tokamak is analyzed with x-ray and electron cyclotron emission imaging techniques. Medium-n (toroidal mode number) instabilities with ballooning characteristics are observed near and within the q = 1.5 surface during a slow degradation in the plasma beta and precede a sudden partial collapse in the central plasma pressure. This is the first reported observation of a ballooning instability in the interior of a large, collisionless tokamak plasma. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543. RI Sabbagh, Steven/C-7142-2011; Yamada, Masaaki/D-7824-2015; OI Yamada, Masaaki/0000-0003-4996-1649; Mauel, Michael/0000-0003-2490-7478 NR 15 TC 17 Z9 17 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 19 PY 1992 VL 69 IS 16 BP 2376 EP 2379 DI 10.1103/PhysRevLett.69.2376 PG 4 WC Physics, Multidisciplinary SC Physics GA JT980 UT WOS:A1992JT98000017 ER PT J AU FONG, GL HAEGEL, NM WALTON, JT AF FONG, GL HAEGEL, NM WALTON, JT TI CARRIER DYNAMICS AND SPACE-CHARGE DIPOLES IN HIGH-PURITY SILICON SO PHYSICAL REVIEW LETTERS LA English DT Article ID RELAXATION SEMICONDUCTORS; SEMI-INSULATORS; INJECTION; TRANSPORT AB Direct evidence of space-charge dipole formation resulting from minority-carrier injection in a high-purity relaxation semiconductor has been observed for the first time. Small signal ac measurements are utilized to monitor the capacitance of a high-purity silicon structure as the temperature is decreased from 70 to 11 K. An increase in capacitance at 22 K is attributed to the formation of a charge dipole as a consequence of majority-carrier depletion in the relaxation regime. C1 LAWRENCE BERKELEY LAB,DEPT ENGN SCI,BERKELEY,CA 94720. RP FONG, GL (reprint author), UNIV CALIF LOS ANGELES,DEPT MAT SCI & ENGN,LOS ANGELES,CA 90024, USA. NR 12 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 19 PY 1992 VL 69 IS 16 BP 2404 EP 2406 DI 10.1103/PhysRevLett.69.2404 PG 3 WC Physics, Multidisciplinary SC Physics GA JT980 UT WOS:A1992JT98000024 ER PT J AU CURTISS, L HALLEY, JW WANG, XR AF CURTISS, L HALLEY, JW WANG, XR TI JAHN-TELLER EFFECT IN LIQUIDS - GENERAL-PRINCIPLES AND A MOLECULAR-DYNAMICS SIMULATION OF THE CUPRIC ION IN WATER SO PHYSICAL REVIEW LETTERS LA English DT Article ID AQUEOUS-SOLUTIONS; NONADDITIVITY; COORDINATION; CU(II) AB We discuss the general conditions under which a Jahn-Teller effect can be meaningfully associated with the solvation shell of an ion in solution. Unlike the Jahn-Teller effect in solids, no distortion of the solvation shell exists on the longest time scales. On intermediate time scales, the solvation shell exhibits cubic (O(h)) symmetry and on the shortest scales it shows the Jahn-Teller distortion (D4h). A molecular-dynamics simulation of a model in which the frame of reference for the Jahn-Teller potential rotates in time exhibits these features and shows how the time scales involved vary with parameters in the potential. C1 UNIV MINNESOTA,SCH PHYS & ASTRON,MINNEAPOLIS,MN 55455. RP CURTISS, L (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 14 TC 26 Z9 26 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 19 PY 1992 VL 69 IS 16 BP 2435 EP 2438 DI 10.1103/PhysRevLett.69.2435 PG 4 WC Physics, Multidisciplinary SC Physics GA JT980 UT WOS:A1992JT98000032 ER PT J AU GOODMAN, CD AUFDERHEIDE, MB BLOOM, SD RESLER, DA AF GOODMAN, CD AUFDERHEIDE, MB BLOOM, SD RESLER, DA TI IS THE WEAK AXIAL-VECTOR CURRENT RENORMALIZED IN NUCLEI - COMMENT SO PHYSICAL REVIEW LETTERS LA English DT Note ID CL-37 C1 INDIANA UNIV, BLOOMINGTON, IN 47408 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP GOODMAN, CD (reprint author), FORSCHUNGSZENTRUM JULICH, INST KERNPHYS, W-5170 JULICH 1, GERMANY. NR 7 TC 9 Z9 9 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 19 PY 1992 VL 69 IS 16 BP 2445 EP 2445 DI 10.1103/PhysRevLett.69.2445 PG 1 WC Physics, Multidisciplinary SC Physics GA JT980 UT WOS:A1992JT98000036 ER PT J AU WELLS, DP ADELBERGER, EG MAGNUS, PV GARCIA, A AF WELLS, DP ADELBERGER, EG MAGNUS, PV GARCIA, A TI IS THE WEAK AXIAL-VECTOR CURRENT RENORMALIZED IN NUCLEI - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Note ID CL-37 C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP WELLS, DP (reprint author), UNIV WASHINGTON,NUCL PHYS,GL-10,SEATTLE,WA 98195, USA. NR 5 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 19 PY 1992 VL 69 IS 16 BP 2446 EP 2446 DI 10.1103/PhysRevLett.69.2446 PG 1 WC Physics, Multidisciplinary SC Physics GA JT980 UT WOS:A1992JT98000037 ER PT J AU DING, YG CHAN, CT HO, KM AF DING, YG CHAN, CT HO, KM TI STRUCTURE OF THE (ROOT(3)X-ROOT(3)R30-DEGREES AG/SI(111) SURFACE FROM 1ST-PRINCIPLES CALCULATIONS - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Note C1 IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. RP DING, YG (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 5 TC 39 Z9 39 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 19 PY 1992 VL 69 IS 16 BP 2452 EP 2452 DI 10.1103/PhysRevLett.69.2452 PG 1 WC Physics, Multidisciplinary SC Physics GA JT980 UT WOS:A1992JT98000043 ER PT J AU MUELLER, FM ARKO, AJ CANFIELD, PC CHRISTENSEN, KT FERENBAUGH, W FOWLER, CM FREEMAN, BL HULTS, WL KING, JC SMITH, JL ASKENAZY, S GOODRICH, RG HALL, D LOWNDES, DH HAANAPPEL, E KIM, JH VAGNER, I WYDER, P AF MUELLER, FM ARKO, AJ CANFIELD, PC CHRISTENSEN, KT FERENBAUGH, W FOWLER, CM FREEMAN, BL HULTS, WL KING, JC SMITH, JL ASKENAZY, S GOODRICH, RG HALL, D LOWNDES, DH HAANAPPEL, E KIM, JH VAGNER, I WYDER, P TI DEHAAS-VANALPHEN EFFECT AND FERMI-SURFACE OF YBA2CU3O6.97 - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Note C1 SERV CHAMPS MAGNET INTENSES,TOULOUSE,FRANCE. LOUISIANA STATE UNIV,BATON ROUGE,LA 70803. OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. GRENOBLE HIGH MAGNET FIELD LAB,GRENOBLE,FRANCE. RP MUELLER, FM (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Christensen, Kenneth/B-1123-2009 OI Christensen, Kenneth/0000-0003-1468-2455 NR 3 TC 1 Z9 1 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 19 PY 1992 VL 69 IS 16 BP 2454 EP 2454 DI 10.1103/PhysRevLett.69.2454 PG 1 WC Physics, Multidisciplinary SC Physics GA JT980 UT WOS:A1992JT98000045 ER PT J AU PLUMP, AS SMITH, JD HAYEK, T AALTOSETALA, K WALSH, A VERSTUYFT, JG RUBIN, EM BRESLOW, JL AF PLUMP, AS SMITH, JD HAYEK, T AALTOSETALA, K WALSH, A VERSTUYFT, JG RUBIN, EM BRESLOW, JL TI SEVERE HYPERCHOLESTEROLEMIA AND ATHEROSCLEROSIS IN APOLIPOPROTEIN-E-DEFICIENT MICE CREATED BY HOMOLOGOUS RECOMBINATION IN ES CELLS SO CELL LA English DT Article ID EMBRYONIC STEM-CELLS; TRANSGENIC MICE; III HYPERLIPOPROTEINEMIA; E POLYMORPHISM; MESSENGER-RNA; STOP CODON; RAT-LIVER; A-I; MOUSE; GENE AB apoE-deficient mice have been created by homologous recombination in ES cells. On a low fat, low cholesterol chow diet these animals have plasma cholesterol levels of 494 mg/dl compared with 60 mg/dl in control animals, and when challenged with a high fat Western-type diet, these animals have plasma cholesterol levels of 1821 mg/dl compared with 132 mg/dl in controls. This marked hypercholesterolemia is primarily due to elevated levels of very low and intermediate density lipoproteins. At 10 weeks of age, apoE-deficient mice have already developed atherosclerotic lesions in the aorta and coronary and pulmonary arteries. apoE-deficient mice are a promising small animal model to help understand the role of apoE in vivo and the genetic and environmental determinants of atherosclerosis. C1 LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. RP PLUMP, AS (reprint author), ROCKEFELLER UNIV,BIOCHEM GENET & METAB LAB,NEW YORK,NY 10021, USA. RI Breslow, Jan/B-7544-2008 FU NHLBI NIH HHS [HL-32435, HL-33714] NR 43 TC 1584 Z9 1636 U1 9 U2 88 PU CELL PRESS PI CAMBRIDGE PA 1050 MASSACHUSETTES AVE, CIRCULATION DEPT, CAMBRIDGE, MA 02138 SN 0092-8674 J9 CELL JI Cell PD OCT 16 PY 1992 VL 71 IS 2 BP 343 EP 353 DI 10.1016/0092-8674(92)90362-G PG 11 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA JU395 UT WOS:A1992JU39500019 PM 1423598 ER PT J AU SACHLEBEN, JR WOOTEN, EW EMSLEY, L PINES, A COLVIN, VL ALIVISATOS, AP AF SACHLEBEN, JR WOOTEN, EW EMSLEY, L PINES, A COLVIN, VL ALIVISATOS, AP TI NMR-STUDIES OF THE SURFACE-STRUCTURE AND DYNAMICS OF SEMICONDUCTOR NANOCRYSTALS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID CLUSTERS; RELAXATION AB H-1 NMR studies of thiophenol capping groups on cadmium sulfide nanocrystals demonstrate that the coverage of the capping molecule depends on the size of the nanocrystal. Data are presented which show that as the size of the nanocrystal increases, the coverage of thiophenol decreases. In addition, information about the overall tumbling of the nanocrystal and the motion of the capping groups relative to the surface can be obtained from linewidth studies, indicating that the rotation of the capping groups is hindered in the smaller nanocrystals (r almost-equal-to 12 angstrom) and becomes less so in larger nanocrystals (r almost-equal-to 20 angstrom). The coverage data are related to the electronic properties of this important class of compounds. C1 LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI Emsley, Lyndon/C-6108-2008; Alivisatos , Paul /N-8863-2015 OI Emsley, Lyndon/0000-0003-1360-2572; Alivisatos , Paul /0000-0001-6895-9048 NR 27 TC 92 Z9 93 U1 1 U2 14 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 OCT 16 PY 1992 VL 198 IS 5 BP 431 EP 436 DI 10.1016/0009-2614(92)80023-5 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JT385 UT WOS:A1992JT38500001 ER PT J AU RUCKMAN, MW MURRAY, MF MOWLEM, JK MOORE, JF STRONGIN, DR AF RUCKMAN, MW MURRAY, MF MOWLEM, JK MOORE, JF STRONGIN, DR TI NEAR-EDGE AND PHOTOEMISSION-STUDIES OF CONDENSED DIBORANE - EVIDENCE FOR INTERMOLECULAR INTERACTIONS IN THE SOLID-PHASE SO CHEMICAL PHYSICS LETTERS LA English DT Article ID FIELD WAVE FUNCTIONS; POLYATOMIC MOLECULES AB Boron K near-edge X-ray absorption fine structure (NEXAFS) and photoemission spectra for condensed diborane and argon containing five percent B2H6 (matrix isolated case) were obtained. The near-edge spectrum obtained for the condensed diborane differs from that obtained for the matrix isolated case which resembles that reported for the gas phase. The valence band photoemission from condensed B2H6 appears more similar to that published for B4H10 than that for gaseous diborane. From the spectroscopic data, it is concluded that diborane molecules are affected by intermolecular interactions and undergo a change in electronic structure. C1 SUNY STONY BROOK,DEPT CHEM,STONY BROOK,NY 11794. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. NR 19 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD OCT 16 PY 1992 VL 198 IS 5 BP 449 EP 453 DI 10.1016/0009-2614(92)80026-8 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JT385 UT WOS:A1992JT38500004 ER PT J AU RAGHAVACHARI, K ROHLFING, CM AF RAGHAVACHARI, K ROHLFING, CM TI STRUCTURES OF SI-10 - ARE THERE CONVENTIONALLY BONDED LOW-ENERGY ISOMERS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID SMALL SILICON CLUSTERS; HIGHLY CORRELATED SYSTEMS; CAS SCF/CI CALCULATIONS; ELECTRONIC-STRUCTURES; MOLECULAR-DYNAMICS; EQUILIBRIUM STRUCTURES; QUANTUM-CHEMISTRY; GAUSSIAN-1 THEORY; 2ND-ROW COMPOUNDS; MAGIC NUMBERS AB Accurate quadratic configuration-interaction calculations including the effects of triple excitations have been performed on different isomers of Si10. In agreement with previous studies, a tetracapped trigonal prism (C3v) is slightly more stable (0.3 eV) than a tetracapped octahedron (T(d)). Both these compact structures involving polyhedral bonding are considerably more stable (2.5 eV) than a conventional tetrahedrally bonded D2h Structure proposed recently by Messmer and Patterson. in addition, the D2h isomer is not a local minimum and collapses to a polyhedrally bonded C2h structure which is 1.6 eV less stable than the C3v form. C1 SANDIA NATL LABS,LIVERMORE,CA 94551. RP RAGHAVACHARI, K (reprint author), AT&T BELL LABS,MURRAY HILL,NJ 07974, USA. NR 56 TC 49 Z9 52 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD OCT 16 PY 1992 VL 198 IS 5 BP 521 EP 525 DI 10.1016/0009-2614(92)80038-D PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JT385 UT WOS:A1992JT38500016 ER PT J AU SZALDA, DJ FUJITA, E AF SZALDA, DJ FUJITA, E TI STRUCTURES OF RACEMIC AND MESO (5,7,7,12,14,14-HEXAMETHYL-1,4,8,11-TETRAAZACYCLOTETRADECA-4,11-DIENE)NI CKEL(II) PERCHLORATE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article AB The crystal structures of racemic and meso (5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclo-tetradeca-4,11-diene)nickel(II) perchlorate, [Ni-(C16H32N4)](ClO4)2, M(r) = 538.06, are reported at 295 K with Mo Kalpha radiation (lambda = 0.71069 angstrom). The d and l isomers cocrystallize to form the racemic structure in the orthorhombic space group Pbca with a = 19.759 (3), b = 17.016 (3), c = 13.661 (3) angstrom, V = 4593 (2) angstrom3, Z = 8, D(x) = 1.556 g cm-3, mu = 11.2 cm-1, F(000) = 2256 and refined to R = 0.051 for 2245 reflections with F(o) > 3sigma(F(o)). The meso isomer crystallized in the monoclinic space group P2(1)/c with a = 10.257 (3), b = 10.742 (2), c = 10.885 (2) angstrom, beta = 111.46 (2)-degrees, V = 11116.2 (9) angstrom3, Z = 2, D(x) = 1.601 g cm-3, mu = 11.6 cm-1, F(000) = 564 and refined to R = 0.042 for 2155 reflections with F(o) > 3sigma(F(o)). The values of the Ni-N(amine) and Ni-N(imine) bond lengths are 1.915 (4) and 1.884 (5) angstrom for the racemic structure and 1.938 (2) and 1.907 (2) angstrom for the meso isomer. C1 CUNY BERNARD M BARUCH COLL,DEPT NAT SCI,NEW YORK,NY 10010. RP SZALDA, DJ (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. RI Fujita, Etsuko/D-8814-2013 NR 7 TC 22 Z9 22 U1 0 U2 4 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 OCT 15 PY 1992 VL 48 BP 1767 EP 1771 DI 10.1107/S0108270192002397 PN 10 PG 5 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA JW261 UT WOS:A1992JW26100011 ER PT J AU KLUNDER, GL SILVA, RJ RUSSO, RE AF KLUNDER, GL SILVA, RJ RUSSO, RE TI PHOTOACOUSTIC-SPECTROSCOPY AND THE EFFECT OF AMPLIFIED SPONTANEOUS EMISSION SO ANALYTICAL CHEMISTRY LA English DT Article ID LASER-OSCILLATORS; DYE-LASERS; ABSORPTION; ASE AB Amplified spontaneous emission (ASE), which results from dye fluorescence, causes pulsed dye lasers to produce an output that is spectrally impure. The effect of such an output can create inaccurate analytical information, particularly in absorption and photothermal spectroscopies. The spectral output of laser dys LD-466 has been characterized. ASE was shown to have a broad-band spectral output, 445-495 nm, and was most intense when lasing was inefficient, on the edges of the dye gain curve. A 10(-3) M Pr3+ solution produced similar photoacoustic waveforms from lasing and ASE. Linear calibration curves were generated with the laser tuned to 468 and 495 nm. At 495 nm Pr3+ has no absorbance and the photoacoustic signals were produced from ASE. C1 LAWRENCE BERKELEY LAB,MS 90-2024,BERKELEY,CA 94720. NR 14 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD OCT 15 PY 1992 VL 64 IS 20 BP 2429 EP 2433 DI 10.1021/ac00044a022 PG 5 WC Chemistry, Analytical SC Chemistry GA JU109 UT WOS:A1992JU10900023 PM 19827822 ER PT J AU SHUM, SCK PANG, HM HOUK, RS AF SHUM, SCK PANG, HM HOUK, RS TI SPECIATION OF MERCURY AND LEAD COMPOUNDS BY MICROBORE COLUMN LIQUID-CHROMATOGRAPHY INDUCTIVELY COUPLED PLASMA MASS-SPECTROMETRY WITH DIRECT INJECTION NEBULIZATION SO ANALYTICAL CHEMISTRY LA English DT Article ID MUSCLE REFERENCE MATERIAL; EMISSION-SPECTROMETRY; TRACE-ELEMENTS; CONCOMITANT ELEMENTS; ATOMIC SPECTROSCOPY; SAMPLE INTRODUCTION; ANALYTE SIGNAL; ICP-MS; IDENTIFICATION; INTERFERENCES AB Various cationic species of Hg (Hg2+, MeH+, EtHg+, and PhHg+) and Pb (Pb2+, (Me)3Pb+, and (Et)3Pb+) are separated as ion pairs by reversed-phase liquid chromatography. Lead is detected st almost-equal-to 0.2 pg and Hg at almost-equal-to 7 pg by inductively coupled plasma mass spectrometry. A direct injection nebulizer minimizes band broadening and yields good sensitivity by injecting all the sample into the plasma. Chromatographic condition such as mobile-phase composition and the compound used for ion pairing are selected based on the mutual requirements of chromatographic performance and detection sensitivity. The inorganic ions Pb2+ and Hg2+ can be monitored directly in human urine by simply diluting and injecting the liquid sample. The organolead and organomercury ions were not concentrated enough to be seen directly in urine, but good separations were obtained when these compounds were spiked into the sample. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,DEPT CHEM,AMES,IA 50011. NR 64 TC 141 Z9 149 U1 5 U2 26 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD OCT 15 PY 1992 VL 64 IS 20 BP 2444 EP 2450 DI 10.1021/ac00044a025 PG 7 WC Chemistry, Analytical SC Chemistry GA JU109 UT WOS:A1992JU10900026 PM 19827823 ER PT J AU MAGUIRE, JJ KAGAN, VE PACKER, L AF MAGUIRE, JJ KAGAN, VE PACKER, L TI ELECTRON-TRANSPORT BETWEEN CYTOCHROME-C AND ALPHA-TOCOPHEROL SO BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS LA English DT Article ID VITAMIN-E; SUBMITOCHONDRIAL PARTICLES; MITOCHONDRIA; UBIQUINONES C1 UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. RP MAGUIRE, JJ (reprint author), LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BERKELEY,CA 94720, USA. FU NCI NIH HHS [CA47597] NR 27 TC 31 Z9 31 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 0006-291X J9 BIOCHEM BIOPH RES CO JI Biochem. Biophys. Res. Commun. PD OCT 15 PY 1992 VL 188 IS 1 BP 190 EP 197 DI 10.1016/0006-291X(92)92368-8 PG 8 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JU247 UT WOS:A1992JU24700028 PM 1329744 ER PT J AU CHASIS, JA MOHANDAS, N AF CHASIS, JA MOHANDAS, N TI RED-BLOOD-CELL GLYCOPHORINS SO BLOOD LA English DT Review ID HUMAN-ERYTHROCYTE-MEMBRANE; AMINO-ACID-SEQUENCE; 4.1(-) HEREDITARY ELLIPTOCYTOSIS; SIALOGLYCOPROTEIN-BETA GENE; HIGH-FREQUENCY ANTIGENS; MONOCLONAL-ANTIBODIES; CDNA CLONES; ACTIVE SIALOGLYCOPROTEINS; MAJOR SIALOGLYCOPROTEIN; DEFICIENT INDIVIDUALS C1 UNIV CALIF SAN FRANCISCO,DEPT MED,SAN FRANCISCO,CA 94143. RP CHASIS, JA (reprint author), LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,MS 74-157,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. FU NIDDK NIH HHS [DK26263, DK32094] NR 88 TC 131 Z9 134 U1 0 U2 2 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD OCT 15 PY 1992 VL 80 IS 8 BP 1869 EP 1879 PG 11 WC Hematology SC Hematology GA JT776 UT WOS:A1992JT77600002 PM 1391951 ER PT J AU COLLART, FR CHUBB, CB MIRKIN, BL HUBERMAN, E AF COLLART, FR CHUBB, CB MIRKIN, BL HUBERMAN, E TI INCREASED INOSINE-5'-PHOSPHATE DEHYDROGENASE GENE-EXPRESSION IN SOLID TUMOR-TISSUES AND TUMOR-CELL LINES SO CANCER RESEARCH LA English DT Note ID INOSINE MONOPHOSPHATE DEHYDROGENASE; IMP DEHYDROGENASE; MYCOPHENOLIC-ACID; CANCER-CELLS; DIFFERENTIATION; LEUKEMIA; CDNAS AB Inosine-5'-phosphate (IMP) dehydrogenase, a regulatory enzyme of guanine nucleotide biosynthesis, may play a role in cell proliferation and malignancy. To assess this role we examined IMP dehydrogenase expression in a series of human solid tumor tissues and tumor cell lines in comparison with their normal counterparts. Increased IMP dehydrogenase gene expression was observed in brain tumors relative to normal brain tissue and in sarcoma cells relative to normal fibroblasts. Similarly, in several B- and T-lymphoid leukemia cell lines, elevated levels of IMP dehydrogenase mRNA and cellular enzyme were observed in comparison with the levels in peripheral blood lymphocytes. These results are consistent with an association between increased IMP dehydrogenase expression and either enhanced cell proliferation or malignant transformation. C1 NORTHWESTERN UNIV,SCH MED,CHILDRENS MEM INST EDUC & RES,CHICAGO,IL 60614. RP COLLART, FR (reprint author), ARGONNE NATL LAB,DIV BIOL & MED RES,ARGONNE,IL 60439, USA. OI Collart, Frank/0000-0001-6942-4483 NR 18 TC 84 Z9 84 U1 1 U2 3 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 OCT 15 PY 1992 VL 52 IS 20 BP 5826 EP 5828 PG 3 WC Oncology SC Oncology GA JU458 UT WOS:A1992JU45800041 PM 1356621 ER PT J AU HAMMEL, BA KANIA, DR ROGERS, F IGLESIAS, CA LEE, RW SEELY, JF BROWN, CM EDWARDS, JM AF HAMMEL, BA KANIA, DR ROGERS, F IGLESIAS, CA LEE, RW SEELY, JF BROWN, CM EDWARDS, JM TI HIGH-RESOLUTION XUV ABSORPTION-SPECTRA OF RADIATIVELY HEATED CH FOILS SO EUROPHYSICS LETTERS LA English DT Article ID LASER; SPECTROSCOPY; OPACITIES; PLASMAS AB We have performed measurements of the absorption spectra of X-ray heated thin (1 mum) CH foils in the spectral region of the carbon K-edge (200-500 eV). One arm of the Nova laser is incident on a 025 mum thick Au foil, producing a soft X-ray source that radiatively heats the CH sample, placed in close proximity to the foil. Absorption spectra are obtained by viewing the soft X-rays from the Au foil, passing through the sample, with a 3 m grazing-incidence spectrometer. We observe strong absorption from bound-bound transitions, in qualitative agreement with calculations (OPAL). These measurements resolve questions raised in earlier work (EDWARDS J. et al., Europhys. Lett., 11 (1990) 631) where thicker samples (5 mum) led to absorption saturation and the formation of an <> structure near the position of the cold-carbon edge. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,LONDON SW7 2AZ,ENGLAND. RP HAMMEL, BA (reprint author), LAWRENCE LIVERMORE NATL LAB,7000 E AVE,LIVERMORE,CA 94550, USA. NR 15 TC 11 Z9 11 U1 3 U2 3 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD OCT 15 PY 1992 VL 20 IS 4 BP 319 EP 324 DI 10.1209/0295-5075/20/4/006 PG 6 WC Physics, Multidisciplinary SC Physics GA JX287 UT WOS:A1992JX28700006 ER PT J AU GODIN, TJ LAFEMINA, JP AF GODIN, TJ LAFEMINA, JP TI COMPARISON OF MNDO TO TIGHT-BINDING, TOTAL-ENERGY METHODS FOR SURFACE ATOMIC-STRUCTURE DETERMINATION - ALUMINUM PHOSPHIDE (110) SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Article ID SEMICONDUCTORS; RECONSTRUCTION; PARAMETERS; BORON; MODEL; BOND AB Tight-binding, total-energy (TBTE) models have been successfully used to calculate the equilibrium surface atomic structures of a variety of materials, but are difficult to apply to substances with complicated interatomic repulsions. In these cases, the modified neglect of diatomic overlap (MNDO) method, which specifically includes longer-range interactions, may provide an effective alternative. We present new calculations of the surface atomic structure of the AlP (110) surface using both techniques. This surface, whose structure has been determined quantitatively using a low-energy, electron-diffraction intensity analysis, displays a well-known relaxation characteristic of (110) surfaces of zincblende-structure semiconductors. The TBTE model, parameterized to bulk AlP properties, provides a more accurate prediction of the relaxed surface atomic positions, although MNDO, parameterized to small molecules, produces acceptable results. Despite the greater demands placed by MNDO On computer resources, it may prove useful in the study of materials that are difficult to model within a TBTE framework. RP GODIN, TJ (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, POB 999, RICHLAND, WA 99352 USA. NR 32 TC 0 Z9 0 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0020-7608 J9 INT J QUANTUM CHEM JI Int. J. Quantum Chem. PD OCT 15 PY 1992 VL 44 IS 4 BP 533 EP 542 DI 10.1002/qua.560440411 PG 10 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA JP790 UT WOS:A1992JP79000009 ER PT J AU KANZLER, AW FREED, KF SHEPPARD, MG AF KANZLER, AW FREED, KF SHEPPARD, MG TI SPIN-INDEPENDENT 3-BODY EFFECTIVE VALENCE-SHELL OPERATORS - APPLICATION TO MOLECULAR-OXYGEN SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Article ID BODY PERTURBATION-THEORY; BOND LENGTH DEPENDENCE; SEMIEMPIRICAL THEORIES; ELECTRONIC-STRUCTURE; POTENTIAL CURVES; ABINITIO; CH AB A mathematical construction is presented that uniquely defines a set of spin-independent effective valence-shell Hamiltonian (H(nu)) three-body matrix elements. These spin-independent H(nu) matrix elements separate direct and exchange portions of the three-body H(nu) matrix elements and therefore provide the most natural form for comparisons with parameterization schemes of semiempirical electronic structure methods in which the three-body matrix elements are incorporated into semiempirical one- and two-body Hamiltonian matrix elements in an averaged manner. Ab initio H(nu) three-body matrix elements of O2 are computed through third order of quasi-degenerate perturbation theory and are analyzed as a function of internuclear distance and atomic orbital overlap to aid in understanding how these three-body matrix elements may be averaged into semiempirical one- and two-body matrix elements. C1 UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637. LOS ALAMOS NATL LAB,DIV APPL THEORET PHYS,LOS ALAMOS,NM 87545. RP KANZLER, AW (reprint author), UNIV CHICAGO,JAMES FRANCK INST,CHICAGO,IL 60637, USA. NR 25 TC 2 Z9 2 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0020-7608 J9 INT J QUANTUM CHEM JI Int. J. Quantum Chem. PD OCT 15 PY 1992 VL 44 IS 4 BP 643 EP 674 DI 10.1002/qua.560440418 PG 32 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA JP790 UT WOS:A1992JP79000016 ER PT J AU MARTZ, JC HESS, DW PETERSEN, EE AF MARTZ, JC HESS, DW PETERSEN, EE TI A GENERALIZED-MODEL OF HEAT-EFFECTS IN SURFACE-REACTIONS .1. MODEL DEVELOPMENT SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID PROCESSES RELEVANT; OXYGEN PLASMAS; TEMPERATURE AB Many important classes of surface reactions exhibit both high heats of reaction and large, positive activation energies. In addition, many surface reactions often occur in thermally isolated environments. As a result, significant autothermic effects are possible. In part I of this article, a generalized model of these effects is presented which describes the enhancement in reaction rate as a function of activation energy, bulk temperature, and a parameter termed the characteristic temperature. Reactant concentration and reaction order effects are also considered. Part II of this work presents the application of this model to numerous experimental plasma etching data. C1 LEHIGH UNIV,INST EMULS POLYMERS,DEPT CHEM ENGN,BETHLEHEM,PA 18015. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. RP MARTZ, JC (reprint author), LOS ALAMOS NATL LAB,DIV NUCL MAT TECHNOL,MS E506,LOS ALAMOS,NM 87545, USA. NR 13 TC 8 Z9 8 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 15 PY 1992 VL 72 IS 8 BP 3282 EP 3288 DI 10.1063/1.351449 PG 7 WC Physics, Applied SC Physics GA JT986 UT WOS:A1992JT98600008 ER PT J AU MARTZ, JC HESS, DW PETERSEN, EE AF MARTZ, JC HESS, DW PETERSEN, EE TI A GENERALIZED-MODEL OF HEAT-EFFECTS IN SURFACE-REACTIONS .2. APPLICATION TO PLASMA-ETCHING REACTIONS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ION AB Part I of this paper presented a generalized model of heat effects operative during surface reactions. The enhancement in reaction rate due to autothermic effects was analyzed as a function of activation energy, bulk temperature, and a parameter termed the characteristic temperature. Application of this model to experimental plasma etching data is presented in part II of this work. Characteristic temperatures calculated from experimental data in numerous plasma etching systems agree closely with the critical characteristic temperature predicted by the heat of the reaction model. Possible reasons for this consistency are given. Further, the autothermic enhancement in the Ta-CF4/O2 etching system is accurately predicted as a function of reactant concentration by a heat of reaction model. C1 LEHIGH UNIV,INST EMULS POLYMERS,DEPT CHEM ENGN,BETHLEHEM,PA 18015. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. RP MARTZ, JC (reprint author), LOS ALAMOS NATL LAB,DIV NUCL MAT TECHNOL,MS E506,LOS ALAMOS,NM 87545, USA. NR 5 TC 12 Z9 12 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 15 PY 1992 VL 72 IS 8 BP 3289 EP 3293 DI 10.1063/1.351450 PG 5 WC Physics, Applied SC Physics GA JT986 UT WOS:A1992JT98600009 ER PT J AU WITHROW, SP WHITE, CW ZUHR, RA MCCAMY, JW PENNYCOOK, SJ HEMBREE, DM AF WITHROW, SP WHITE, CW ZUHR, RA MCCAMY, JW PENNYCOOK, SJ HEMBREE, DM TI ANALYSIS OF C FILMS FORMED ON SINGLE-CRYSTAL CU BY ION-IMPLANTATION AND LASER ANNEALING SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID DIAMOND FILMS; RAMAN-SPECTROSCOPY; GRAPHITE AB Single-crystal Cu has been ion implanted with C to fluences of 1 X 10(18)/CM2 followed by laser annealing with nanosecond pulses from an excimer laser and subsequently etched in dilute nitric acid. Raman spectroscopy, Rutherford backscattering, and electron microscopy have been used to identify the distribution and morphology of the carbon at different stages of sample processing. Polycrystalline graphite and amorphous carbon films are typically produced over a wide range of processing conditions; well-ordered graphite can be formed as well. Small Cu crystallites are seen in areas where the etch lifted the C films off the substrate. However, extensive analysis by Raman spectroscopy and electron microscopy provides no evidence for the formation of the diamond phase of carbon. C1 OAK RIDGE Y-12 PLANT,OAK RIDGE,TN 37831. RP WITHROW, SP (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 16 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 15 PY 1992 VL 72 IS 8 BP 3485 EP 3491 DI 10.1063/1.351425 PG 7 WC Physics, Applied SC Physics GA JT986 UT WOS:A1992JT98600036 ER PT J AU KWAK, BS FIRST, PN ERBIL, A WILKENS, BJ BUDAI, JD CHISHOLM, MF BOATNER, LA AF KWAK, BS FIRST, PN ERBIL, A WILKENS, BJ BUDAI, JD CHISHOLM, MF BOATNER, LA TI STUDY OF EPITAXIAL PLATINUM THIN-FILMS GROWN BY METALORGANIC CHEMICAL VAPOR-DEPOSITION SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB The metalorganic chemical vapor deposition technique has been successfully applied to the growth of epitaxial platinum thin films on (100) surfaces of single-crystal potassium tantalate (KTaO3) and strontium titanate (SrTiO3). Platinum thin films grown on KTaO3 (100) at a rate of 70 nm/h showed strong Rutherford backscattering spectroscopy (RBS)/channeling effects with chi(min) of 4%. In-plane phi and theta-2theta scan x-ray diffraction analysis demonstrated the three-dimensional epitaxial alignment of the platinum film with the KTaO3 substrate. Transmission electron micrographs viewed in cross section provided additional information regarding the nature of the epitaxial Pt-KTaO3 interface. The room-temperature resistivity of a 60-nm-thick Pt film on KTaO3 (100) was 12.0 muOMEGA cm. X-ray diffraction and pole-figure analysis showed that in the case of Pt films deposited on either fused quartz or Si (100) surfaces, the resulting films were polycrystalline and were fully textured with [111] orientations perpendicular to the substrate surfaces. C1 GEORGIA INST TECHNOL,SCH PHYS,ATLANTA,GA 30332. BELL COMMUN RES INC,RED BANK,NJ 07701. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RI Boatner, Lynn/I-6428-2013; Budai, John/R-9276-2016 OI Boatner, Lynn/0000-0002-0235-7594; Budai, John/0000-0002-7444-1306 NR 15 TC 23 Z9 25 U1 0 U2 7 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 15 PY 1992 VL 72 IS 8 BP 3735 EP 3740 DI 10.1063/1.352293 PG 6 WC Physics, Applied SC Physics GA JT986 UT WOS:A1992JT98600078 ER PT J AU GOLDERNOVOSELSKY, E FORTE, TM NICHOLS, AV RUBIN, EM AF GOLDERNOVOSELSKY, E FORTE, TM NICHOLS, AV RUBIN, EM TI APOLIPOPROTEIN-A-I EXPRESSION AND HIGH-DENSITY-LIPOPROTEIN DISTRIBUTION IN TRANSGENIC MICE DURING DEVELOPMENT SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID GRADIENT GEL-ELECTROPHORESIS; PLASMA-LEVELS; SIZE; GENE; RAT AB The developmental changes in apoAI expression in human apolipoprotein AI (apoAI) transgenic and non-transgenic control mice and the effect of these changes on high density lipoprotein (HDL) sizes were investigated. Results demonstrated that both human and mouse apoAI mRNA levels sharply increased following delivery and then decreased prior to weaning. Unlike the changes in apoAI mRNA, plasma apoAI concentration and HDL mass increased following delivery and remained elevated as the animals matured. In these animals, parallel increases in plasma apoAI and HDL mass with development were accompanied by increases in HDL particle sizes. Control mice demonstrated a monodisperse population of particles that increased in particle size from 7.5 nm (at 2 days prior to birth) to 9.8 nm (at 13 days after birth). The latter is similar to the adult HDL size and distribution. Transgenic mice, unlike controls, exhibited several distinct HDL populations, which also increased in size as animals matured. These results suggest that post-transcriptional factors are important in regulating apoAI plasma levels and that developmental changes in plasma apoAI concentrations are associated with changes in HDL size distribution. C1 LAWRENCE BERKELEY LAB,DIV LIFE SCI,BLDG 74,1 CYCLOTRON RD,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. FU NHLBI NIH HHS [HL07279, HL18574, HL46281] NR 15 TC 12 Z9 12 U1 0 U2 0 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD OCT 15 PY 1992 VL 267 IS 29 BP 20787 EP 20790 PG 4 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JT978 UT WOS:A1992JT97800044 PM 1383210 ER PT J AU KNIGHT, LB KERR, K VILLANUEVA, M MCKINLEY, AJ FELLER, D AF KNIGHT, LB KERR, K VILLANUEVA, M MCKINLEY, AJ FELLER, D TI THEORETICAL AND NEON MATRIX ELECTRON-SPIN-RESONANCE STUDIES OF THE METHANOL CATION - CH3OH+, CH3OD+, CH2DOH+, AND (CH3OH+)-C-13) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MOLECULAR-ORBITAL METHODS; GAUSSIAN-BASIS SETS; HYPERFINE COUPLING-CONSTANTS; RADICAL CATION; CONFIGURATION-INTERACTION; MICROWAVE-SPECTRUM; LASER VAPORIZATION; ATOMIC PARAMETERS; ORGANIC IONS; ORION-KL AB Four isotopes of the methanol cation radical (CH3OH+) have been generated by three independent methods and isolated in neon matrices at 4 K for a detailed electron spin resonance (ESR) investigation. The ion generation methods employed were X irradiation, photoionization, and electron ionization. The nuclear hyperfine (A tensors) measurements were compared with those obtained from ab initio extended basis set multireference configuration interaction (CI) wave functions. The relationships between geometry and electronic structures were fully explored. The trend in the large isotropic methyl hydrogen A values for the isoelectronic series CH3F+, CH3OH+, and CH3NH2+ was found to follow the trend in dissociation energies for these radical cations. The neon magnetic parameters for CH3OH+ are g(x) = 2.0036(4) and g(z) = 2.010(1); A(iso) (methyl hydrogens) =229(1) MHz, \A(x)\ = 54(2) and \A(z)\ = 80(3) MHz for the hydroxy hydrogen; \A(x)\ = 40(2) and \A(z)\ = 29(4) MHz for C-13. The observed magnetic parameters for CH2DOH+ indicate an unusually large deuterium effect A(iso) (CH2) = 329 MHz with \A(iso)\ = 4.1(3) MHz for the methyl deuterium. These results show that averaging of the methyl hydrogen environments is occurring on the ESR time scale. C1 PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RP KNIGHT, LB (reprint author), FURMAN UNIV, DEPT CHEM, GREENVILLE, SC 29613 USA. RI McKinley, Allan/C-7501-2011 NR 75 TC 39 Z9 39 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 15 PY 1992 VL 97 IS 8 BP 5363 EP 5376 DI 10.1063/1.463796 PG 14 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JU516 UT WOS:A1992JU51600009 ER PT J AU BONANG, CC CAMERON, SM AF BONANG, CC CAMERON, SM TI CHARACTERIZATION OF EXCITED ELECTRONIC STATES OF NAPHTHALENE BY RESONANCE RAMAN AND HYPER-RAMAN SCATTERING SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID SPECTROSCOPY; BENZENE; EXCITATION AB The first resonance Raman.and hyper-Raman scattering from naphthalene are reported. Fourth harmonic of a mode-locked Nd:YAG laser is used to resonantly excite the 1B1u+ transition, producing Raman spectra that confirm the dominance of the vibronically active nu28 (b3g) mode and the Franck-Condon active a(g) modes, nu5 and nu3. A synchronously pumped stilbene dye laser and its second harmonic are employed as the excitation sources for hyper-Raman and Raman scattering from the overlapping 1B2u+ and 1A(g)- states. The Raman spectra indicate that the equilibrium geometry of naphthalene is distorted primarily along nu5, nu8, and nu7 normal coordinates upon excitation to 1B2u+. The hyper-Raman spectrum shows that nu25 (b2u) is the mode principally responsible for vibronic coupling between the 1A(g)- and 1B2u+ states. The results demonstrate the advantageous features of resonance hyper-Raman scattering for the case of overlapping one- and two-photon allowed transitions. Calculations based on simple molecular orbital configurations are shown to qualitatively agree with the experimental results. RP BONANG, CC (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT APPL SCI,LIVERMORE,CA 94550, USA. NR 25 TC 21 Z9 21 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 15 PY 1992 VL 97 IS 8 BP 5377 EP 5383 DI 10.1063/1.463797 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JU516 UT WOS:A1992JU51600010 ER PT J AU SCHULTZ, KE RUSSELL, DJ HARRIS, CB AF SCHULTZ, KE RUSSELL, DJ HARRIS, CB TI THE APPLICABILITY OF BINARY COLLISION THEORIES TO COMPLEX-MOLECULES IN SIMPLE LIQUIDS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID DEPENDENT ENERGY-TRANSFER; 17 COLLIDER GASES; VIBRATIONAL-RELAXATION; PICOSECOND DYNAMICS; CHEMICAL-REACTIONS; AZULENE; PHASE; STATE; DEACTIVATION; TRANSITION AB The relaxation dynamics of vibrationally excited ground-state azulene molecules have been examined by picosecond transient absorption spectroscopy in a variety of different solvents including hexane, chloromethanes, methanol, CClF3, Xe, and Kr. A high pressure optical cell was used to liquify gases for use as solvents and to change their density and temperature independently over the entire liquid density range. Experimental results indicate that the vibrational cooling rate is strongly solvent dependent, with cooling rates of approximately 20 ps in molecular solvents and approximately 150 ps in atomic solvents. Comparison of the rates in Xe. and Kr at constant number density demonstrates the strong effect of solvent mass on energy transfer. The effect of solvent temperature on vibrational cooling is minimal, as is the effect of solvent density. The latter result is quite surprising in light of earlier experiments on simpler molecular systems, such as 12 in Xe, and predictions of isolated binary collision theories. An explanation is offered from large scale molecular dynamics simulations of the system. In effect, azulene forms an "ordered Xe cluster" with xenon atoms; the xenon number density normal to the azulene molecular plane is independent of solvent density. C1 UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, DIV CHEM SCI, BERKELEY, CA 94720 USA. NR 40 TC 44 Z9 44 U1 0 U2 2 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 OCT 15 PY 1992 VL 97 IS 8 BP 5431 EP 5438 DI 10.1063/1.463987 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JU516 UT WOS:A1992JU51600016 ER PT J AU SUN, WG MCCURDY, CW LENGSFIELD, BH AF SUN, WG MCCURDY, CW LENGSFIELD, BH TI ABINITIO STUDY OF LOW-ENERGY ELECTRON-ETHANE SCATTERING SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID KOHN VARIATIONAL METHOD; POLYATOMIC-MOLECULES; CROSS-SECTIONS; METHANE SCATTERING; COLLISIONS; POLARIZABILITIES; EXCITATION; FORMALDEHYDE; HYDROCARBONS; ETHYLENE AB We report the results of the first ab initio study of low-energy electron-ethane scattering which includes the effect of target polarization. The complex-Kohn method is used in scattering calculations that employ both static-exchange and polarized-self-consistent-field (polarized-SCF) trial functions. Integral, momentum transfer, and differential elastic cross sections are reported for both staggered and eclipsed conformations. Overall agreement between our studies and the most recent experimental data is very good. For staggered ethane, our integral cross section shows a Ramsauer-Townsend minimum at 0. 18 eV. This is only the second theoretical study to find such a minimum in a molecule that possesses a nonzero quadrupole moment. We find that a polarized-SCF wave function is needed to obtain reliable cross sections in the vicinity of the Ramsauer-Townsend minimum and that this polarized-SCF wave function also provides a good description of the 7.5 eV f-wave shape resonance. The low-energy cross sections we obtain for staggered and eclipsed C2H6 differ very little from each other near the Ramsauer-Townsend minimum, but significant differences are found at higher energies. C1 LAWRENCE LIVERMORE NATL LAB,NATL ENERGY RES SUPERCOMP CTR,LIVERMORE,CA 94550. LAWRENCE LIVERMORE NATL LAB,THEORET ATOM & MOLEC PHYS GRP,LIVERMORE,CA 94550. RP SUN, WG (reprint author), OHIO STATE UNIV,DEPT CHEM,COLUMBUS,OH 43210, USA. NR 27 TC 25 Z9 25 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 15 PY 1992 VL 97 IS 8 BP 5480 EP 5488 DI 10.1063/1.463781 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JU516 UT WOS:A1992JU51600021 ER PT J AU KUCHTA, B ETTERS, RD LESAR, R AF KUCHTA, B ETTERS, RD LESAR, R TI THE INFLUENCE OF MOLECULAR SHAPES ON THE RELATIVE STABILITY OF SOLID-PHASES - APPLICATION TO N2O SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID X-RAY-DIFFRACTION; DYNAMIC PROPERTIES; RAMAN-SPECTRA; HIGH-PRESSURE; NITROGEN; CO; TEMPERATURE; POTENTIALS; GPA AB It has been shown that the shape of molecules, represented by the calculated molecular charge distribution, is a valuable source of information about the nature of the potential between molecules. For solid N2O, calculations based on the Kihara and the isotropic and anisotropic site-site potential models have shown that details of the molecular shape affects the relative stability of cubic, tetragonal, and orthorhombic phases at various pressures. This and details of the utilization of experimental data to characterize the potential show that features Of CO2 are also described. Also, a Monte Carlo calculation, using a random variable to simulate the end-to-end disorder of solid N2O, conclusively shows that the average structure is Pa3 at low pressure and Cmca above 4.75 GPa. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. WROCLAW TECH UNIV,INST ORGAN & PHYS CHEM,PL-50320 WROCLAW,POLAND. RP KUCHTA, B (reprint author), COLORADO STATE UNIV,DEPT PHYS,FT COLLINS,CO 80523, USA. RI LeSar, Richard/G-1609-2012; Kuchta, Bogdan/I-6471-2015 OI Kuchta, Bogdan/0000-0002-8635-4154 NR 31 TC 12 Z9 12 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 15 PY 1992 VL 97 IS 8 BP 5662 EP 5668 DI 10.1063/1.463774 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JU516 UT WOS:A1992JU51600041 ER PT J AU KIM, DY LEE, K MA, CI MAHALINGAM, M HANSON, DM HULBERT, SL AF KIM, DY LEE, K MA, CI MAHALINGAM, M HANSON, DM HULBERT, SL TI CORE-HOLE EXCITED-STATES OF H2O - SYMMETRIES AND RELATIVE OSCILLATOR-STRENGTHS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Note ID K-SHELL EXCITATION; TRIATOMIC PHOTOFRAGMENT SPECTRA; X-RAY SPECTROSCOPY; ANGULAR-DISTRIBUTIONS; NO2 PHOTODISSOCIATION; N-2 C1 BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP KIM, DY (reprint author), SUNY STONY BROOK,DEPT CHEM,STONY BROOK,NY 11794, USA. NR 20 TC 40 Z9 40 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 15 PY 1992 VL 97 IS 8 BP 5915 EP 5918 DI 10.1063/1.463985 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JU516 UT WOS:A1992JU51600071 ER PT J AU SHEU, EY LIANG, KS SINHA, SK OVERFIELD, RE AF SHEU, EY LIANG, KS SINHA, SK OVERFIELD, RE TI POLYDISPERSITY ANALYSIS OF ASPHALTENE SOLUTIONS IN TOLUENE SO JOURNAL OF COLLOID AND INTERFACE SCIENCE LA English DT Article ID ANGLE NEUTRON-SCATTERING; MOLECULAR-WEIGHT; MACROSTRUCTURE; ASSOCIATION C1 EXXON RES & ENGN CO,ANNANDALE,NJ 08801. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. ESSO RESOURCES CANADA LTD,CALGARY,ALBERTA,CANADA. NR 16 TC 74 Z9 79 U1 0 U2 6 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9797 J9 J COLLOID INTERF SCI JI J. Colloid Interface Sci. PD OCT 15 PY 1992 VL 153 IS 2 BP 399 EP 410 DI 10.1016/0021-9797(92)90331-F PG 12 WC Chemistry, Physical SC Chemistry GA JT521 UT WOS:A1992JT52100008 ER PT J AU VIRDEN, JW BERG, JC AF VIRDEN, JW BERG, JC TI THE STERIC STABILIZATION OF SMALL UNILAMELLAR VESICLES SO JOURNAL OF COLLOID AND INTERFACE SCIENCE LA English DT Article ID DETERGENTS; PHOSPHOLIPIDS; SCATTERING; LIPOSOMES; SURFACES C1 UNIV WASHINGTON, DEPT CHEM ENGN, BF 10, SEATTLE, WA 98195 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 19 TC 14 Z9 14 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 0021-9797 J9 J COLLOID INTERF SCI JI J. Colloid Interface Sci. PD OCT 15 PY 1992 VL 153 IS 2 BP 411 EP 419 DI 10.1016/0021-9797(92)90332-G PG 9 WC Chemistry, Physical SC Chemistry GA JT521 UT WOS:A1992JT52100009 ER PT J AU GODBOLE, MJ PEDRAZA, AJ ALLARD, LF GEESEY, G AF GODBOLE, MJ PEDRAZA, AJ ALLARD, LF GEESEY, G TI CHARACTERIZATION OF SPUTTER-DEPOSITED 316L STAINLESS-STEEL FILMS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article AB Sputter-deposited 316L stainless steel films deposited on various substrates were characterized using transmission electron microscopy and X-ray diffractometry. The deposits were found to be fine-grained and the phases present in the films depended on the nature of the substrate. Films of various thicknesses deposited on microscope slides or oxidized stainless steel substrates contained a mixture of two phases: a body centre cubic (b c c) and a modified hexagonal epsilon-phase. The hexagonal phase appeared to be an ordered phase, as suggested by the a0 value of the structure, which is twice that for the epsilon-martensite found in many deformed stainless steels. These films were hard and brittle, as indicated by microhardness measurements. Films deposited on oxide-free austenitic stainless steel substrates, on the other hand, were mostly b c c and exhibited a dominant [200] texture. These films were softer and less brittle than those deposited on oxidized substrates. In situ high-temperature X-ray diffractometry revealed that the epsilon-phase transformed to b c c when the films were annealed at 773 K. On annealing at 873 K, the b c c phase transformed to face centre cubic, which remained stable on cooling to room temperature. These results agree with published data which suggest stability of the b c c phase up to 840 K. Some discrepancies from earlier published reports are discussed in the light of the present results. C1 OAK RIDGE NATL LAB,HIGH TEMP MAT LAB,OAK RIDGE,TN 37831. MONTANA STATE UNIV,COLL ENGN,BOZEMAN,MT 59717. RP GODBOLE, MJ (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. NR 15 TC 10 Z9 10 U1 0 U2 1 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD OCT 15 PY 1992 VL 27 IS 20 BP 5585 EP 5590 DI 10.1007/BF00541627 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA JV024 UT WOS:A1992JV02400027 ER PT J AU OLDENBERG, RC LOGE, GW HARRADINE, DM WINN, KR AF OLDENBERG, RC LOGE, GW HARRADINE, DM WINN, KR TI KINETIC-STUDY OF THE OH+H-2 REACTION FROM 800-K TO 1550-K SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID H2O + H; VIBRATIONAL-RELAXATION; OH; O2 AB Direct measurements of the rate constant for the bimolecular reaction OH + H-2 --> H + H2O have been completed in the temperature range 800-1550 K. In these experiments, small amounts of water vapor were photolyzed with an excimer laser to "instantaneously' create OH radicals and H atoms. The subsequent time history of the OH radicals was monitored by using laser-induced fluorescence. Analysis of the OH removal rate as a function of added hydrogen yielded the rate constant for the above reaction. The temperature range of our measurements bridges the gap between the recent shock tube data (1246-2581 K) of Michael and Sutherland, Frank and Just; Davidson, Chang, and Hanson and the quartz cell flash photolysis data (250-1050 K) of Tully, Ravishankara, and co-workers. Our data are in very good agreement with these previous data sets in the overlap region. By combining our data with these four data sets, we derive a new rate constant expression, k = (3.56 X 10(-16)T1.52 exp[-1736/T] cm3 molecule-1 s-1, that is applicable in the temperature range 250-2581 K. RP OLDENBERG, RC (reprint author), LOS ALAMOS NATL LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545, USA. NR 18 TC 39 Z9 39 U1 2 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD OCT 15 PY 1992 VL 96 IS 21 BP 8426 EP 8430 DI 10.1021/j100200a041 PG 5 WC Chemistry, Physical SC Chemistry GA JU555 UT WOS:A1992JU55500041 ER PT J AU PEARSON, JG CHMELKA, BF SHYKIND, DN PINES, A AF PEARSON, JG CHMELKA, BF SHYKIND, DN PINES, A TI MULTIPLE-QUANTUM NMR-STUDY OF THE DISTRIBUTION OF BENZENE IN NAY ZEOLITE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; MOLECULAR-DYNAMICS; AROMATIC-MOLECULES; Y-ZEOLITE; LOCALIZATION; SOLIDS AB We have used multiple-quantum NMR to measure the apparent spin network size as a function of excitation time of NaY zeolite samples containing varying amounts of benzene. Behavior observed at low concentrations of benzene was consistent with the presence of isolated clusters of benzene molecules in the supercages, with a statistical distribution of benzene molecules between supercages. Behavior observed at high concentrations of benzene was consistent with the presence of weakly coupled clusters of benzene molecules, with a uniform distribution of benzene molecules between supercages. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. NR 24 TC 27 Z9 27 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD OCT 15 PY 1992 VL 96 IS 21 BP 8517 EP 8522 DI 10.1021/j100200a057 PG 6 WC Chemistry, Physical SC Chemistry GA JU555 UT WOS:A1992JU55500057 ER PT J AU HJELM, RP THIYAGARAJAN, P ALKANONYUKSEL, H AF HJELM, RP THIYAGARAJAN, P ALKANONYUKSEL, H TI ORGANIZATION OF PHOSPHATIDYLCHOLINE AND BILE-SALT IN RODLIKE MIXED MICELLES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ANGLE NEUTRON-SCATTERING; NUCLEAR MAGNETIC-RESONANCE; BILIARY LIPID SYSTEMS; MOLECULAR-ORGANIZATION; CHOLATE-WATER; LECITHIN; EQUILIBRIUM; DILUTION; PHASES AB Small-angle neutron scattering (SANS) of aqueous mixed colloids of the bile salts glycocholate or glycochenodeoxycholate with egg yolk phosphatidylcholine and mixtures of taurocholate with dipalmatoylphosphatidylcholine (DPPC) shows that all of these systems form particles with rodlike morphology in parts of the concentration-composition phase map. The formation of rodlike mixed micelles thus is a general feature of the phosphatidylcholine-bile salt systems. The orientation of the phosphatidylcholine and bile salts in the rod-shaped mixed micelles is addressed by SANS measurements of the aqueous mixtures of taurocholate with DPPC and with DPPC with the choline methyls deuterated. The results are consistent with the phosphatidylcholine being arranged in the rod such that the long axis is perpendicular to the axis of the rodlike particle. The amount of bile salt in the rods calculated from the small-angle neutron scattering assuming radial arrangement of phosphatidylcholine suggests that the bile salt is inserted with its long axis parallel to the rod axis. Comparison of the cross-sectional radius of gyration and contrast-weighted mass per unit length of the egg yolk phosphatidylcholine-bile salt mixtures with those from the DPPC-bile salt mixtures indicates that this, arrangement of the two components is a general feature of these systems. C1 ARGONNE NATL LAB,DIV INTENSE PULSED NEUTRON SOURCE,ARGONNE,IL 60439. UNIV ILLINOIS,DEPT PHARMACEUT,CHICAGO,IL 60612. RP HJELM, RP (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS NEUTRON SCATTERING CTR,LOS ALAMOS,NM 87545, USA. RI Lujan Center, LANL/G-4896-2012 NR 30 TC 101 Z9 101 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD OCT 15 PY 1992 VL 96 IS 21 BP 8653 EP 8661 DI 10.1021/j100200a080 PG 9 WC Chemistry, Physical SC Chemistry GA JU555 UT WOS:A1992JU55500080 ER PT J AU DIMELFI, RJ AF DIMELFI, RJ TI ON THE TRANSITION TO INTERGRANULAR FRACTURE DURING HIGH-TEMPERATURE DEFORMATION SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID TYPE-316 STAINLESS-STEEL; GRAIN-BOUNDARIES; NUCLEATION; CAVITATION; FLOW AB The nature of the transition from transgranular fracture to intergranular fracture by wedge cracking at grain boundary triple junctions or by cavitation at grain boundary precipitates during high temperature deformation of polycrystalline metals is analyzed. To do this, a model material is constructed that is composed of grain matrix and grain boundary "materials", each having its own steady state deformation law. The physical and adjustable parameters used in these flow laws are fixed in reference to the high temperature deformation behavior of type 316 stainless steel. The flow incompatibility between the grain matrix and grain boundary reflected in these equations can produce stress concentrations sufficient to cause intergranular separation under certain loading conditions. Characteristic times associated with the build-up and relaxation of stress concentrations at precipitates and triple junctions are calculated using these flow laws and the applicable diffusion equation. These characteristic times are compared with the cavity nucleation incubation time, and the conditions for fracture mode transitions are thereby determined. Simple rate ratio criteria obtained from these results indicate that, at a given temperature, wedge cracking occurs below the applied stress level where the ratio of the boundary strain rate to the matrix strain rate equals the ratio of the grain size to the boundary width: epsilon(b)/epsilon(m) = L/delta "r cavitation" occurs below the even lower applied stress level where epsilon(b)/epsilon(m) = 10(7) for type 316 stainless steel. Model predictions based on these criteria compare favorably with published data on material deformed monotonically and in fatigue, including the effects of hold periods. RP DIMELFI, RJ (reprint author), ARGONNE NATL LAB,RE-207,ARGONNE,IL 60439, USA. NR 25 TC 5 Z9 5 U1 1 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 OCT 15 PY 1992 VL 158 IS 1 BP 53 EP 63 DI 10.1016/0921-5093(92)90134-M PG 11 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JX651 UT WOS:A1992JX65100007 ER PT J AU RENGAN, A NARAYAN, J JAHNKE, C BEDGE, S PARK, JL LI, M AF RENGAN, A NARAYAN, J JAHNKE, C BEDGE, S PARK, JL LI, M TI CHARACTERISTICS OF DIAMOND-LIKE CARBON-FILMS FORMED BY A HYBRID LASER PLASMA ABLATION OF GRAPHITE SO MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY LA English DT Article ID AMORPHOUS-CARBON; RAMAN-SPECTRA; SPECTROSCOPY; DEPOSITION AB A novel laser-plasma technique was used for the deposition of diamond-like carbon (DLC) films. The films were deposited in vacuum and in hydrogen ambients and the substrate temperature was varied from 25 to 860-degrees-C. The DLC films were characterized by spectroscopic ellipsometry, Fourier transform infrared (FTIR) and Raman spectroscopy. The sp3/sp2 fraction was estimated by using the effective number of valence electrons, n(eff), from n and k measurements. The Raman disorder mode, or D band and the Raman-allowed graphitic mode, or G band, were deconvoluted using gaussian functions. A correlation was obtained between the sp3 concentration, (C(sp3)), and the D band shift. Specifically, an increase in C(sp3) resulted in a downward shift in the D band. The results are supported by FTIR measurements indicating a combination of disordered and sp3 phonon absorption bands for the films deposited in a vacuum ambient and stabilized sp3 bonds for the films deposited in a hydrogen ambient. C1 N CAROLINA STATE UNIV,DEPT PHYS,RALEIGH,NC 27695. N CAROLINA STATE UNIV,DEPT CHEM ENGN,RALEIGH,NC 27695. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV N CAROLINA,DEPT CHEM,CHAPEL HILL,NC 27514. RP RENGAN, A (reprint author), N CAROLINA STATE UNIV,DEPT MAT SCI & ENGN,RALEIGH,NC 27695, USA. RI Narayan, Jagdish/D-1874-2009 NR 24 TC 29 Z9 29 U1 0 U2 6 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5107 J9 MAT SCI ENG B-SOLID JI Mater. Sci. Eng. B-Solid State Mater. Adv. Technol. PD OCT 15 PY 1992 VL 15 IS 1 BP 15 EP 24 DI 10.1016/0921-5107(92)90023-3 PG 10 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA JV826 UT WOS:A1992JV82600004 ER PT J AU LINK, B EPSTEIN, RI VANRIPER, KA AF LINK, B EPSTEIN, RI VANRIPER, KA TI PULSAR GLITCHES AS PROBES OF NEUTRON-STAR INTERIORS SO NATURE LA English DT Article ID MATTER; SUPERFLUIDITY; EQUATION AB PULSAR rotation rates generally decrease steadily owing to external electromagnetic braking torques, but occasionally show sudden increases ('glitches') followed by gradual recoveries that may last days or years. These events are thought to be consequences of angular momentum transfer between a solid crust, which rotates at the measured pulsar periodicity, and a more rapidly rotating 'loose' component of the neutron star interior. Sudden braking of the differential rotation between the two components will cause a glitch1, and the subsequent re-establishment of rotational equilibrium between the two components represents the recovery2. Earlier studies, using particular models for the coupling between crust and interior, showed that the loose component carries approximately 2.8% and greater than or similar to 1% of the total moment of inertia of the Vela pulsar3 and PSR 1737-30 (ref. 4) respectively. Here, we analyse post-glitch recovery in four pulsars, and deduce that the loose component carries at least 0.8% of the total moment of inertia, independent of the form of the coupling. In the context of the 'vortex creep' model of recovery, in which the loose component is the inner-crust neutron superfluid2,5-7, the constraint on the moment of inertia rules out equations of state that are soft at high densities. RP LINK, B (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 27 TC 40 Z9 40 U1 2 U2 5 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD OCT 15 PY 1992 VL 359 IS 6396 BP 616 EP 618 DI 10.1038/359616a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JT824 UT WOS:A1992JT82400049 ER PT J AU DUREN, M MOROZ, Z VELTRI, M ZAPFE, K MAIRON, H METZGER, M POVH, B RITH, K STEFFENS, E STOCK, F TOPORKOV, D ZETSCHE, F SHIBATA, TA FICK, D KORSCH, W GRAW, G HAEBERLI, W GARVEY, GT AF DUREN, M MOROZ, Z VELTRI, M ZAPFE, K MAIRON, H METZGER, M POVH, B RITH, K STEFFENS, E STOCK, F TOPORKOV, D ZETSCHE, F SHIBATA, TA FICK, D KORSCH, W GRAW, G HAEBERLI, W GARVEY, GT TI TEST OF A POLARIZED HYDROGEN GAS-TARGET BASED ON THE STORAGE CELL TECHNIQUE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID ELASTIC-SCATTERING; ASYMMETRY AB A polarized hydrogen gas target for use in storage rings has been developed. One application may be the production of a stored polarized antiproton beam via spin dependent attenuation which would allow a study of the spin-dependence of antiproton-proton interactions. In order to increase the target thickness compared to jet targets the polarized hydrogen atoms are injected into a T-shaped storage cell. Polarization and density of the target have been measured in a test experiment by elastic scattering of an alpha-beam from the Heidelberg MP-tandem accelerator. The target polarization amounts to 83+/-8% of the maximum possible value. The target areal density of n = (2.6+/-0.1+/-0.2) X 10(13) H over arrow pointing right/cm2 is consistent with the density calculated from the measured H over arrow pointing right beam intensity. C1 UNIV HEIDELBERG,INST PHYS,W-6900 HEIDELBERG,GERMANY. UNIV MARBURG,FACHBEREICH PHYS,W-3550 MARBURG,GERMANY. UNIV MARBURG,ZENTRUM WISSENSCH,W-3550 MARBURG,GERMANY. UNIV MUNICH,SEKT PHYS,W-8046 GARCHING,GERMANY. UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. INST NUCL STUDIES,PL-05400 OTWOCK,POLAND. NOVOSIBIRSK NUCL PHYS INST,NOVOSIBIRSK 630090,USSR. RP DUREN, M (reprint author), MAX PLANCK INST NUCL PHYS,W-6900 HEIDELBERG 1,GERMANY. NR 34 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD OCT 15 PY 1992 VL 322 IS 1 BP 13 EP 19 DI 10.1016/0168-9002(92)90352-5 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JV512 UT WOS:A1992JV51200003 ER PT J AU TATCHYN, R AF TATCHYN, R TI OFF-AXIS FIELD EFFECTS ON THE OUTPUT SPECTRA OF VERTICALLY ASYMMETRIC ADJUSTABLE-PHASE INSERTION DEVICES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB A number of alternative variable-field insertion device configurations that utilize differential longitudinal displacements of the undulator jaws for tuning have been recently proposed. In this paper we examine some of the off-axis field effects on the radiation characteristics of such devices and derive a number of conditions under which excessive degradation of the spectral-angular intensity distribution is attained. C1 UNIV OREGON,INST THEORET SCI,EUGENE,OR 97403. LAWRENCE BERKELEY LAB,CTR XRAY OPT,BERKELEY,CA 94720. RP TATCHYN, R (reprint author), STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94305, USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD OCT 15 PY 1992 VL 322 IS 1 BP 126 EP 134 DI 10.1016/0168-9002(92)90366-C PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JV512 UT WOS:A1992JV51200017 ER PT J AU HADLEY, GR AF HADLEY, GR TI WIDE-ANGLE BEAM PROPAGATION USING PADE APPROXIMANT OPERATORS SO OPTICS LETTERS LA English DT Article ID RIB WAVE-GUIDES; LIGHT-PROPAGATION AB A new beam-propagation method is presented whereby the exact scalar Helmholtz propagation operator is replaced by any one of a sequence of higher-order (n, n) Pade approximant operators. The resulting differential equation may then be discretized to obtain (in two dimensions) a matrix equation of bandwidth 2n + 1 that is solvable by using standard implicit solution techniques. The final algorithm allows (for n = 2) accurate propagation at angles of greater than 55 deg from the propagation axis as well as propagation through materials with widely differing indices of refraction. RP HADLEY, GR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 9 TC 292 Z9 303 U1 2 U2 8 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD OCT 15 PY 1992 VL 17 IS 20 BP 1426 EP 1428 DI 10.1364/OL.17.001426 PG 3 WC Optics SC Optics GA JT568 UT WOS:A1992JT56800009 PM 19798202 ER PT J AU LANDEN, OL ALLEY, WE AF LANDEN, OL ALLEY, WE TI DYNAMICS OF PICOSECOND-LASER-PULSE PLASMAS DETERMINED FROM THE SPECTRAL SHIFTS OF REFLECTED PROBE PULSES SO PHYSICAL REVIEW A LA English DT Article ID HIGH-DENSITY PLASMA; X-RAY PULSES; SOLID TARGETS; ABSORPTION; FEMTOSECOND; RADIATION; GENERATION; EMISSION; LIGHT; SPECTROSCOPY AB The evolution of density profiles in plasmas produced by 10(14)-W cm-2, 1-ps, 580-nm-wavelength laser pulses has been determined from spectral shifts imposed on a reflected picosecond probe pulse. The shifts are caused by two mechanisms: hydrodynamic expansion and ionization front motion. Both time-resolved expansion velocities and ionization rates are inferred from the spectral shifts and are compared to one-dimensional hydrodynamic simulations. C1 UNIV CALIF DAVIS, DEPT APPL SCI, DAVIS, CA 95616 USA. RP LANDEN, OL (reprint author), LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 48 TC 35 Z9 35 U1 0 U2 5 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD OCT 15 PY 1992 VL 46 IS 8 BP 5089 EP 5100 DI 10.1103/PhysRevA.46.5089 PG 12 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JW974 UT WOS:A1992JW97400083 ER PT J AU CLEROUIN, J POLLOCK, EL ZERAH, G AF CLEROUIN, J POLLOCK, EL ZERAH, G TI THOMAS-FERMI MOLECULAR-DYNAMICS SO PHYSICAL REVIEW A LA English DT Article ID DENSITY-FUNCTIONAL THEORY; SYSTEMS AB A three-dimensional density-functional molecular-dynamics code is developed for the Thomas-Fermi density functional as a prototype for density functionals using only the-density. Following Car and Parrinello [Phys. Rev. Lett. 55, 2471 (1985)], the electronic density is treated as a dynamical variable. The electronic densities are verified against a multi-ion Thomas-Fermi algorithm due to Parker [Phys. Rev. A 38, 2205 (1988)]. As an initial application, the effect of electronic polarization in enhancing ionic diffusion in strongly coupled plasmas is demonstrated. C1 CTR ETUD LIMEIL VALENTON, F-94195 VILLENEUVE ST GEORGES, FRANCE. RP CLEROUIN, J (reprint author), LAWRENCE LIVERMORE NATL LAB, DEPT PHYS, LIVERMORE, CA 94550 USA. RI Clerouin, jean/D-8528-2015 OI Clerouin, jean/0000-0003-2144-2759 NR 11 TC 47 Z9 47 U1 0 U2 6 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 EI 1094-1622 J9 PHYS REV A JI Phys. Rev. A PD OCT 15 PY 1992 VL 46 IS 8 BP 5130 EP 5137 DI 10.1103/PhysRevA.46.5130 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JW974 UT WOS:A1992JW97400087 ER PT J AU JONES, ME KEINIGS, R PETER, W AF JONES, ME KEINIGS, R PETER, W TI TRANSVERSE WAKE FIELDS IN DIELECTRIC WAKE-FIELD ACCELERATORS SO PHYSICAL REVIEW A LA English DT Article AB The transverse wake field in a dielectric wake-field accelerator for drive beams with a small nonaxisymmetric component (l not-equal 0) has been calculated in the ultrarelativistic limit. It is found that for the lth azimuthal mode, where l > 0, the transverse component is comparable to the longitudinal component. This implies that these devices will be subject to a beam-breakup instability as the drive current becomes large. C1 BEN GURION UNIV NEGEV,DEPT PHYS,IL-84105 BEER SHEVA,ISRAEL. RP JONES, ME (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 13 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD OCT 15 PY 1992 VL 46 IS 8 BP 5183 EP 5188 DI 10.1103/PhysRevA.46.5183 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JW974 UT WOS:A1992JW97400093 ER PT J AU WANG, XD ZHANG, XG BUTLER, WH STOCKS, GM HARMON, BN AF WANG, XD ZHANG, XG BUTLER, WH STOCKS, GM HARMON, BN TI RELATIVISTIC-MULTIPLE-SCATTERING THEORY FOR SPACE-FILLING POTENTIALS SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; FERROMAGNETS AB We derive a relativistic full-potential multiple-scattering theory (MST) as a direct analog of a recently developed version of nonrelativistic full-potential MST. The secular equation is derived from the Lippmann-Schwinger equation by expanding the wave function in terms of cell basis functions which are locally exact solutions of the Dirac equation. The Green function can be expressed in terms of the basis functions and the secular matrix in a form analogous to the nonrelativistic case. The relationship between this theory and currently widely used relativistic muffin-tin MST is also discussed. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV KENTUCKY,CTR COMPUTAT SCI,LEXINGTON,KY 40506. OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP WANG, XD (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Stocks, George Malcollm/Q-1251-2016 OI Stocks, George Malcollm/0000-0002-9013-260X NR 19 TC 31 Z9 31 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1992 VL 46 IS 15 BP 9352 EP 9358 DI 10.1103/PhysRevB.46.9352 PG 7 WC Physics, Condensed Matter SC Physics GA JV112 UT WOS:A1992JV11200008 ER PT J AU EMIN, D AF EMIN, D TI LOW-TEMPERATURE AC CONDUCTIVITY OF ADIABATIC SMALL-POLARONIC HOPPING IN DISORDERED-SYSTEMS SO PHYSICAL REVIEW B LA English DT Article ID TRANSITION; GLASSES; SOLIDS AB Electronic hopping is commonly treated as occurring between localized states that are so widely separated that the motion is limited by the electronic transfer energy linking the sites. Then, the jump rate is usually assumed to fall exponentially with increasing intersite separation. However, this approach is inappropriate in many situations where the separation between the hopping sites is small enough that electronic carriers adiabatically follow the atomic motion. For adiabatic motion, the jump rates are essentially independent of intersite separation. Here the low-temperature ac conductivity for adiabatic small-polaronic hopping between close pairs of sites is calculated presuming a distribution of local site energies. Low-temperature relaxation of each such carrier is assumed to occur primarily through the emission of a very-low-energy acoustic phonon. For small-polaronic hops, low-temperature one-phonon emission rates are extremely slow. Dispersion of the transition rates arises from the dependence of the relaxation rates on the energy separations between the sites. In the low-temperature limit, the polarization conductivity is proportional to both temperature and frequency. Above this low-temperature limit, the severity of this temperature dependence increases with increasing temperature. In this higher-temperature regime, the temperature dependence of the conductivity also decreases as the frequency is increased. These results are in accord with observations in many systems with hopping conduction, including those for which there is explicit evidence of adiabatic small-polaronic hopping (e.g., p-type MnO, boron carbides, and many transition-metal-oxide glasses). RP EMIN, D (reprint author), SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. NR 28 TC 41 Z9 42 U1 2 U2 7 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1992 VL 46 IS 15 BP 9419 EP 9427 DI 10.1103/PhysRevB.46.9419 PG 9 WC Physics, Condensed Matter SC Physics GA JV112 UT WOS:A1992JV11200015 ER PT J AU TAN, ZQ HEALD, SM RAPPOSCH, M BOULDIN, CE WOICIK, JC AF TAN, ZQ HEALD, SM RAPPOSCH, M BOULDIN, CE WOICIK, JC TI GOLD-INDUCED GERMANIUM CRYSTALLIZATION SO PHYSICAL REVIEW B LA English DT Article ID SILICON; SI AB When in contact with metal, amorphous silicon (a-Si) or germanium (a-Ge) often crystallize at temperatures significantly lower than in their bulk form. In order to understand the role of the contact metal, we have studied the crystallization process of a-Ge/Au bilayers and codeposited a-Ge1-xAux films (x=0.04 and 0.22) by measuring the Ge and Au extended x-ray-absorption fine structure. Upon isothermal annealing, the Ge/Au bilayer crystallizes at 170-degrees-C, and concomitantly, a large amount of Au migrates into the Ge top layer. For codeposited films, the x=0.22 sample crystallizes at 130-degrees-C and the x=0.04 sample at 330-degrees-C. In the amorphous x=0.04 and 0.22 films, each Au atom on the average is bound with one to two Ge atoms at 2.4 angstrom, but does not have Au neighbors. As the films crystallize, Au transforms into fcc gold in the x=0.22 sample but remains bound with Ge in the x=0.04 sample. Our results demonstrate that Au-Ge bonding is significant in the a-Ge and may play an important role in lowering the Ge crystallization temperature. C1 UNIV CONNECTICUT,DEPT PHYS,STORRS,CT 06269. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP TAN, ZQ (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 17 TC 57 Z9 59 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 OCT 15 PY 1992 VL 46 IS 15 BP 9505 EP 9519 DI 10.1103/PhysRevB.46.9505 PG 15 WC Physics, Condensed Matter SC Physics GA JV112 UT WOS:A1992JV11200026 ER PT J AU FONG, CY NELSON, JS HEMSTREET, LA GALLUP, RF CHANG, LL ESAKI, L AF FONG, CY NELSON, JS HEMSTREET, LA GALLUP, RF CHANG, LL ESAKI, L TI RESONANT TUNNELING IN COUPLED QUANTUM DOTS SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC-FIELD; STATES; SPECTROSCOPY; SPECTRA AB We have applied a scaled version of the Kohn-Sham equations of density-functional theory to study the charge distribution at the condition of resonant tunneling in coupled quantum dots. We find that the tunneling process is governed by the symmetry properties of the resonantly coupled quantum-dot states. At resonance, the coupled atomiclike quantum-dot states form bonding and antibonding molecular resonant-tunneling states. The charge distribution of the bonding-type state is given. In addition, we find asymmetries of the charge in the barrier vs voltage (analogous to I-V curves) as a result of electron-electron interactions between electrons in the excited tunneling and ground states. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. USN,RES LAB,WASHINGTON,DC 20375. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. RP FONG, CY (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. RI Esaki, Leo/B-2776-2011 NR 25 TC 22 Z9 22 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1992 VL 46 IS 15 BP 9538 EP 9543 DI 10.1103/PhysRevB.46.9538 PG 6 WC Physics, Condensed Matter SC Physics GA JV112 UT WOS:A1992JV11200031 ER PT J AU MIN, BJ LEE, YH WANG, CZ CHAN, CT HO, KM AF MIN, BJ LEE, YH WANG, CZ CHAN, CT HO, KM TI TIGHT-BINDING MOLECULAR-DYNAMICS STUDY OF THE HYDROGEN VIBRATION SPECTRUM ON A SI(111) SURFACE SO PHYSICAL REVIEW B LA English DT Article ID ADSORBATE-SUBSTRATE VIBRATION; ENERGY-LOSS-SPECTROSCOPY; H STRETCHING VIBRATION; SILICON; SI; PHONONS; DIAMOND; MODEL; ADSORPTION; GERMANIUM AB The vibration spectrum of hydrogen on a Si(111) surface is studied by molecular-dynamics simulation using an empirical tight-binding potential model. The frequencies of the stretching and wagging modes of hydrogen obtained from the simulations are in excellent agreement with experiment. An extra mode on the hydrogen overlayer at 62 meV, which has been observed in electron-energy-loss experiments, is also reproduced. We show that the extra mode originates from the coupling between the H wagging mode and a Si substrate phonon mode. The frequency shifts of the stretching and the wagging mode of H with temperature are also obtained from our simulations. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP MIN, BJ (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,MICROELECTR RES CTR,AMES,IA 50011, USA. RI Lee, Young Hee/A-5424-2013 NR 22 TC 22 Z9 22 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1992 VL 46 IS 15 BP 9677 EP 9682 DI 10.1103/PhysRevB.46.9677 PG 6 WC Physics, Condensed Matter SC Physics GA JV112 UT WOS:A1992JV11200047 ER PT J AU XIAO, XD ZHU, XD DAUM, W SHEN, YR AF XIAO, XD ZHU, XD DAUM, W SHEN, YR TI OPTICAL 2ND-HARMONIC DIFFRACTION STUDY OF ANISOTROPIC SURFACE-DIFFUSION - CO ON NI(110) SO PHYSICAL REVIEW B LA English DT Article ID ADSORBATE-ADSORBATE INTERACTIONS; CARBON-MONOXIDE CHEMISORPTION; SELF-DIFFUSION; COVERAGE DEPENDENCE; MOLECULAR-DYNAMICS; DESORPTION; GENERATION; HYDROGEN; SPECTROSCOPY; TEMPERATURE AB We describe in detail a technique using optical second-harmonic (SH) diffraction from a one-dimensional laser-induced monolayer grating to probe surface diffusion of adsorbates and its anisotropy on a solid surface. The case of CO on Ni(110) is used as a demonstration. The two orthogonal and independent diffusion tensor components along [110BAR] and [001] are measured, exhibiting a strong anisotropy in both the activation energy E(diff) and the preexponential factor D0 in the diffusion coefficients. A compensation effect between E(diff) and D0 is observed. In comparison with CO/Ni(111) and CO/Ni(100), our result suggests that the Ni(110) surface seen by CO is much smoother than Ni(111) and Ni(100). Both advantages and limitations of the present technique are mentioned and possible complications in the data analysis are discussed. RP XIAO, XD (reprint author), LAWRENCE BERKELEY LAB,DEPT PHYS,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 53 TC 36 Z9 36 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1992 VL 46 IS 15 BP 9732 EP 9743 DI 10.1103/PhysRevB.46.9732 PG 12 WC Physics, Condensed Matter SC Physics GA JV112 UT WOS:A1992JV11200055 ER PT J AU WANG, CZ CHAN, CT HO, KM AF WANG, CZ CHAN, CT HO, KM TI STRUCTURE AND DYNAMICS OF C-60 AND C-70 FROM TIGHT-BINDING MOLECULAR-DYNAMICS SO PHYSICAL REVIEW B LA English DT Article ID C60; CARBON; TEMPERATURE; STABILITY; CLUSTERS; SPECTRA AB Structural and vibrational properties of C60 and C70 fullerenes are studied by molecular dynamics using a recently developed tight-binding potential model. It is shown that this tight-binding molecular-dynamics scheme has accuracy comparable to ab initio techniques and is very efficient for studying the finite temperature properties of fullerenes. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP WANG, CZ (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 19 TC 65 Z9 65 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1992 VL 46 IS 15 BP 9761 EP 9767 DI 10.1103/PhysRevB.46.9761 PG 7 WC Physics, Condensed Matter SC Physics GA JV112 UT WOS:A1992JV11200058 ER PT J AU WANG, LH ZENG, FA FENG, SH ZHU, Y AF WANG, LH ZENG, FA FENG, SH ZHU, Y TI QUANTIZATION EFFECTS ON MAGNETOPLASMONS IN QUANTUM-WELLS SO PHYSICAL REVIEW B LA English DT Note ID ELECTRON-GAS; POINT CONTACTS; CONDUCTANCE AB We study theoretically quantization effects in intrasubband magnetoplasmon energy spectra, for both quasi-one-dimensional (1D) and quasi-2D structures, using random-phase-approximation calculations. We find interesting peak structures in the intrasubband magnetoplasmon energy spectra when the Fermi surface crosses new energy subbands. The heights of such peaks are quantitatively calculated. Experimental accessibility of such effect is discussed. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. RP WANG, LH (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 17 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1992 VL 46 IS 15 BP 9804 EP 9807 DI 10.1103/PhysRevB.46.9804 PG 4 WC Physics, Condensed Matter SC Physics GA JV112 UT WOS:A1992JV11200068 ER PT J AU KRESIN, VV LIPPARINI, E AF KRESIN, VV LIPPARINI, E TI PHOTODISINTEGRATION SUM-RULE AND ELECTRON-DISTRIBUTION IN METAL-CLUSTERS SO PHYSICAL REVIEW B LA English DT Note ID PHOTOABSORPTION AB The inverse energy-weighted photodisintegration sum rule sigma-1 = integral [sigma(omega)/omega]domega is investigated. This quantity can be reliably extracted from experimental measurements of the cluster photoabsorption cross section sigma(omega), and is shown to reflect the strongly correlated character of the motion of valence electrons. A model-independent relation between sigma-1 and the amplitude of the zero-point motion in the dipole mode is derived. Theoretical results for the sum rule are discussed and compared with experimental data. An expression for the mean distance between two electrons in a cluster is derived. C1 INST PHYS NUCL,DIV PHYS THEOR,F-91406 ORSAY,FRANCE. UNIV TRENTO,DIPARTIMENTO FIS,I-38050 TRENT,ITALY. RP KRESIN, VV (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Kresin, Vitaly/N-8095-2014 OI Kresin, Vitaly/0000-0002-6226-4576 NR 13 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1992 VL 46 IS 15 BP 9812 EP 9814 DI 10.1103/PhysRevB.46.9812 PG 3 WC Physics, Condensed Matter SC Physics GA JV112 UT WOS:A1992JV11200070 ER PT J AU GARCIA, A ELSASSER, C ZHU, J LOUIE, SG COHEN, ML AF GARCIA, A ELSASSER, C ZHU, J LOUIE, SG COHEN, ML TI USE OF GRADIENT-CORRECTED FUNCTIONALS IN TOTAL-ENERGY CALCULATIONS FOR SOLIDS SO PHYSICAL REVIEW B LA English DT Note ID GROUND-STATE PROPERTIES; NORM-CONSERVING PSEUDOPOTENTIALS; INHOMOGENEOUS ELECTRON-GAS; DENSITY FUNCTIONALS; NONLOCAL EXCHANGE; APPROXIMATION; SYSTEMS; METALS; IRON AB We have used two gradient-corrected exchange-correlation functionals to compute the lattice constant, bulk modulus, and cohesive energy for the simple metal Al, the sp-bonded semiconductors Si, Ge, and GaAs, and the 4d transition metals Nb and Pd. We find no consistent improvement over the predictions of the local-density approximation. C1 LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. RP GARCIA, A (reprint author), UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. RI Garcia, Alberto/A-7460-2008 OI Garcia, Alberto/0000-0001-5138-9579 NR 44 TC 116 Z9 116 U1 0 U2 6 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 OCT 15 PY 1992 VL 46 IS 15 BP 9829 EP 9832 DI 10.1103/PhysRevB.46.9829 PG 4 WC Physics, Condensed Matter SC Physics GA JV112 UT WOS:A1992JV11200075 ER PT J AU BORNEMANN, HJ WALUKIEWICZ, W BLISS, DE AF BORNEMANN, HJ WALUKIEWICZ, W BLISS, DE TI ANTIFERROMAGNETIC ORDERING OF DEFECTS IN GAAS SO PHYSICAL REVIEW B LA English DT Note ID MOLECULAR-BEAM EPITAXY; GALLIUM-ARSENIDE; COMPENSATION AB The magnetic susceptibility of GaAs samples containing a large concentration of native defects was investigated by dc magnetization measurements. Thin GaAs films grown by molecular-beam epitaxy at very low temperatures and bulk GaAs:S samples irradiated with fast neutrons have been studied. For all samples, the susceptibility follows a Curie-Weiss law, indicating the presence of localized magnetic moments. These moments are attributed to unpaired spins located at the native defects. Negative Curie-Weiss temperatures found for both neutron-irradiated and low-temperature-grown GaAs is a clear manifestation of an antiferromagnetic interaction between the moments. The presence of a highly inhomogeneous distribution of native defects has to be assumed to account for the observed antiferromagnetic ordering. C1 MORRIS RES INC,BERKELEY,CA 94704. LAWRENCE BERKELEY LAB,DIV MAT SCI,CTR ADV MAT,BERKELEY,CA 94720. NR 19 TC 1 Z9 1 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1992 VL 46 IS 15 BP 9849 EP 9852 DI 10.1103/PhysRevB.46.9849 PG 4 WC Physics, Condensed Matter SC Physics GA JV112 UT WOS:A1992JV11200080 ER PT J AU WANDER, A PENDRY, JB VANHOVE, MA AF WANDER, A PENDRY, JB VANHOVE, MA TI LINEAR-APPROXIMATION TO DYNAMIC LOW-ENERGY ELECTRON-DIFFRACTION SO PHYSICAL REVIEW B LA English DT Note ID SURFACE-STRUCTURE DETERMINATION; TENSOR LEED; CRYSTALLOGRAPHY AB A linear approximation to dynamical low-energy electron diffraction (LEED) is proposed, called linear LEED (LLEED). It may hold the key to the solution of complex surface structures with large atomic displacements, in a way complementary to tensor LEED. More ambitious possibilities also present themselves, based on direct inversion schemes and related in spirit to holographic ideas. Linear LEED relies on the approximate linear independence of diffracted amplitudes from subunits such as atoms or molecules, and reduces enormously the number of full dynamical LEED calculations needed in a structural search. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,CTR ADV MAT,BERKELEY,CA 94720. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND. RI Van Hove, Michel/A-9862-2008 OI Van Hove, Michel/0000-0002-8898-6921 NR 12 TC 26 Z9 27 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1992 VL 46 IS 15 BP 9897 EP 9899 DI 10.1103/PhysRevB.46.9897 PG 3 WC Physics, Condensed Matter SC Physics GA JV112 UT WOS:A1992JV11200092 ER PT J AU YEH, CY LU, ZW FROYEN, S ZUNGER, A AF YEH, CY LU, ZW FROYEN, S ZUNGER, A TI ZINC-BLENDE-WURTZITE POLYTYPISM IN SEMICONDUCTORS SO PHYSICAL REVIEW B LA English DT Article ID STRUCTURAL STABILITY DIAGRAM; INTERMETALLIC COMPOUNDS; TOTAL ENERGY; PHASE; TRANSITION; CRYSTALS; EPITAXY; NITRIDE; GROWTH AB The zinc-blende (ZB) and wurtzite (W) structures are the most common crystal forms of binary octet semiconductors. In this work we have developed a simple scaling that systematizes the T = 0 energy difference DELTAE(W-ZB) between W and ZB for all simple binary semiconductors. We have first calculated the energy difference DELTAE(W-ZB)LDF (AB) for AlN, GaN, InN, AlP, AlAs, GaP, GaAs, ZnS, ZnSe, ZnTe, CdS, C, and Si using a numerically precise implementation of the first-principles local-density formalism (LDF), including structural relaxations. We then find a linear scaling between DELTAE(W-ZB)LDF (AB) and an atomistic orbital-radii coordinate R (A,B) that depends only on the properties of the free atoms A and B making up the binary compound AB. Unlike classical structural coordinates (electronegativity, atomic sizes, electron count), R is an orbital-dependent quantity; it is calculated from atomic pseudopotentials. The good linear fit found between DELTAE(W-ZB) and R (rms error of approximately 3 meV/atom) permits predictions of the W-ZB energy difference for many more AB compounds than the 13 used in establishing this fit. We use this model to identify chemical trends in DELTAE(W-ZB) in the IV-IV, III-V, II-VI, and I-VII octet compounds as either the anion or the cation are varied. We further find that the ground state of MgTe is the NiAs structure and that CdSe and HgSe are stable in the ZB form. These compounds were previously thought to be stable in the W structures. RP YEH, CY (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. RI Zunger, Alex/A-6733-2013 NR 73 TC 704 Z9 722 U1 27 U2 173 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1992 VL 46 IS 16 BP 10086 EP 10097 DI 10.1103/PhysRevB.46.10086 PG 12 WC Physics, Condensed Matter SC Physics GA JW513 UT WOS:A1992JW51300019 ER PT J AU LUSCOMBE, JH BOUCHARD, AM LUBAN, M AF LUSCOMBE, JH BOUCHARD, AM LUBAN, M TI ELECTRON CONFINEMENT IN QUANTUM NANOSTRUCTURE - SELF-CONSISTENT POISSON-SCHRODINGER THEORY SO PHYSICAL REVIEW B LA English DT Article ID STATES; GAAS; HETEROJUNCTIONS; SEMICONDUCTOR; TRANSPORT; CHANNELS; DOTS AB We compute the self consistent electron states and confining potential, V (r, T), for laterally confined cylindrical quantum wires at a temperature T from a numerical solution of the coupled Poisson and Schrodinger (PS) equations. Finite-temperature effects are included in the electron density function, n(r, T), via the single-particle density matrix in the grand-canonical ensemble using the self-consistent bound states. We compare our results for a GaAs quantum wire with those obtained previously [J. H. Luscombe and M. Luban, Appl. Phys. Lett. 57, 61 (1990)] from a finite-temperature Thomas-Fermi (TF) approximation. We find that the TF results agree well with those of the more realistic, but also more computationally intensive PS theory, except for low temperatures or for cases where the quantum wire is almost, but not totally, depleted due to a combination of either small geometry, surface boundary conditions, or low doping concentrations. In the latter situations, the number of subbands that are populated is relatively small, and both n(r, T) and V(r, T) exhibit Friedel-type oscillations. Otherwise the TF theory, which is based on free-particle states, is remarkably accurate. We also present results for the partial electron density functions associated with the angular momentum quantum numbers, and discuss their role in populating the quantum wire. C1 IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS & ASTRON, AMES LAB, AMES, IA 50011 USA. RP LUSCOMBE, JH (reprint author), TEXAS INSTRUMENTS INC, CENT RES LABS, DALLAS, TX 75265 USA. NR 35 TC 54 Z9 54 U1 2 U2 14 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1992 VL 46 IS 16 BP 10262 EP 10268 DI 10.1103/PhysRevB.46.10262 PG 7 WC Physics, Condensed Matter SC Physics GA JW513 UT WOS:A1992JW51300041 ER PT J AU WANG, J OCKO, BM DAVENPORT, AJ ISAACS, HS AF WANG, J OCKO, BM DAVENPORT, AJ ISAACS, HS TI INSITU X-RAY-DIFFRACTION AND X-RAY-REFLECTIVITY STUDIES OF THE AU(111) ELECTROLYTE INTERFACE - RECONSTRUCTION AND ANION ADSORPTION SO PHYSICAL REVIEW B LA English DT Article ID SCANNING TUNNELING MICROSCOPY; INDUCED SURFACE RECONSTRUCTION; 100 CRYSTAL FACES; AU(001) SURFACE; CRYSTALLOGRAPHIC ORIENTATION; SCATTERING MEASUREMENTS; ELECTROCHEMICAL-CELL; GOLD; PHASES; RESOLUTION AB In situ x-ray-scattering studies of the Au(111) electrode surface have been carried out in NaF, NaCl, LiCl, CsCl, KCl, and NaBr solutions using grazing-incident-angle diffraction and reflectivity techniques. The top layer of gold atoms undergoes a reversible phase transition between the (1 X 1) bulk termination and a (p X square-root 3) uniaxial discommensuration (striped) phase on changing the electrode potential. Below the critical potential, in all solutions, p = 23, which is identical to that obtained in vacuum. An ordered array of discommensuration kinks is not observed. Above the critical potential, 23 < p < 30. At sufficiently positive potentials, the surface forms an ideally terminated (111) surface. In the negative potential sweep, the reconstruction starts to reform at the critical potential. Analysis of the potential dependence of the scattered x-ray intensity with differing anions in NaF, NaCl, and NaBr solutions supports a unifying model that depends on the induced surface charge density. The transition to the (1 X 1) phase is much faster than the formation of the reconstructed phase. Cycling the potential in the reconstructed region improves the reconstructed surface order. The adsorption of anions and "surface water" at the gold interface has been investigated using specular x-ray reflectivity. C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. RP WANG, J (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Wang, Jia/B-6346-2011; Davenport, Alison/J-6089-2013 OI Davenport, Alison/0000-0003-0853-515X NR 59 TC 222 Z9 222 U1 3 U2 37 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1992 VL 46 IS 16 BP 10321 EP 10338 DI 10.1103/PhysRevB.46.10321 PG 18 WC Physics, Condensed Matter SC Physics GA JW513 UT WOS:A1992JW51300048 ER PT J AU DODELSON, S TURNER, MS AF DODELSON, S TURNER, MS TI NONEQUILIBRIUM NEUTRINO STATISTICAL-MECHANICS IN THE EXPANDING UNIVERSE SO PHYSICAL REVIEW D LA English DT Article ID NUCLEOSYNTHESIS; RATES; WEAK AB We study neutrino decoupling in the early Universe (t approximately sec, T approximately MeV) by integrating the Boltzmann equations that govern the neutrino phase-space distribution functions. In particular, we compute the distortions in the nu(e) and nu(mu)/nu(tau) phase-space distributions that arise in the standard cosmology due to e+/- annihilations. These distortions are nonthermal, with the effective neutrino temperature increasing with neutrino momentum, approaching a 0.7% increase for electron neutrinos and a 0.3% increase for mu and tau neutrinos at the highest neutrino momenta, and correspond to an increase in the energy density of nu(e)'s of about 1.2% and in the energy density of nu(mu)/nu(tau)'s of about 0.5% (roughly one additional relic neutrino per cm-3 per species). The distortion for electron neutrinos is larger than that for mu and tau neutrinos because electron neutrinos couple to e+/-'s through both charged- and neutral-current interactions. Our results graphically illustrate that neutrino decoupling is a continuous process which is momentum dependent. Because of subtle cancellations, these distortions lead to only a tiny change in the predicted primordial He-4 abundance, DELTAY congruent-to 1-2 X 10(-4). C1 UNIV CHICAGO,ENRICO FERMI INST,DEPT PHYS & ASTRON,CHICAGO,IL 60637. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTROPHYS,CHICAGO,IL 60637. RP DODELSON, S (reprint author), FERMI NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510, USA. NR 18 TC 77 Z9 77 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD OCT 15 PY 1992 VL 46 IS 8 BP 3372 EP 3387 DI 10.1103/PhysRevD.46.3372 PG 16 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JV113 UT WOS:A1992JV11300021 ER PT J AU ARNOLD, P BRAATEN, E VOKOS, S AF ARNOLD, P BRAATEN, E VOKOS, S TI RESOLVING THE UNITARY GAUGE PUZZLE OF THERMAL PHASE-TRANSITIONS SO PHYSICAL REVIEW D LA English DT Article ID FINITE TEMPERATURE; SYMMETRY BEHAVIOR; DEPENDENCE AB Broken gauge symmetries are typically restored at high temperature, and the critical temperature T(c) can be found to leading order by a simple, one-loop calculation in a renormalizable gauge. However, the one-loop calculation in unitary gauge yields a different result than in typical renormalizable gauges, and it has long been a puzzle how to calculate thermal quantities in unitary gauge. We show in the Abelian Higgs model that, for temperature T small compared to T(c), the loop expansion in unitary gauge is an expansion in T2/T(c)2. Thus, all orders in the loop expansion are relevant to the leading-order determination of the critical temperature. By explicit two-loop calculation, we verify that gauge-invariant quantities such as the effective scalar mass and the free energy of the vacuum agree with renormalizable gauge results to the corresponding order in T2/T(c)2. To this order, the equivalence of unitary and renormalizable gauges may be succinctly summarized by the corresponding high-temperature effective Lagrangians, which differ only by a nonlinear field redefinition. C1 ARGONNE NATL LAB, DIV HIGH ENERGY PHYS, ARGONNE, IL 60439 USA. RP NORTHWESTERN UNIV, DEPT PHYS & ASTRON, EVANSTON, IL 60208 USA. NR 19 TC 15 Z9 15 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD OCT 15 PY 1992 VL 46 IS 8 BP 3576 EP 3586 DI 10.1103/PhysRevD.46.3576 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JV113 UT WOS:A1992JV11300038 ER PT J AU DELANEY, DB JADACH, S SHIO, C SIOPSIS, G WARD, BFL AF DELANEY, DB JADACH, S SHIO, C SIOPSIS, G WARD, BFL TI MULTIPLE PHOTON EFFECTS IN PP SCATTERING AT SSC ENERGIES SO PHYSICS LETTERS B LA English DT Article ID SOFT PHOTONS; CARLO AB The Monte Carlo program SSCYFS2 is used in conjunction with available parton distribution functions to calculate the effects of multiple photon radiation on pp scattering at SSC energies. Effects relevant to precision SSC physics such as Higgs discovery and exploration are illustrated. C1 CERN,DIV TH,CH-1211 GENEVA 23,SWITZERLAND. STANFORD UNIV,SLAC,STANFORD,CA 94309. RP DELANEY, DB (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. RI Siopsis, George/A-9779-2008 OI Siopsis, George/0000-0002-1466-2772 NR 18 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD OCT 15 PY 1992 VL 292 IS 3-4 BP 413 EP 416 DI 10.1016/0370-2693(92)91196-G PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JT867 UT WOS:A1992JT86700031 ER PT J AU ADRIANI, O AGUILARBENITEZ, M AHLEN, S AKBARI, H ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BLUMENFELD, B BOBBINK, GJ BOCCIOLINI, M BOCK, R BOHM, A BORGIA, B BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUISSON, C BUJAK, A BURGER, JD BURGER, WJ BURQ, JP BUSENITZ, J CAI, XD CAPELL, M 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VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A VANDERZWAAN, BCC AF ADRIANI, O AGUILARBENITEZ, M AHLEN, S AKBARI, H ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL 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F PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIND, O RIZVI, HA RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SAJAN, E SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMIEMANN, K SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHUTTE, J SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SODERSTROM, E SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TAYLOR, L TIMMERMANS, C TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A VANDERZWAAN, BCC TI MEASUREMENT OF THE E+E- -] B(B)OVER-BAR AND E+E- -] C(C)OVER-BAR FORWARD BACKWARD ASYMMETRIES AT THE Z0 RESONANCE SO PHYSICS LETTERS B LA English DT Article ID FERMION PAIR PRODUCTION; QED CORRECTIONS; DECAYS; ANNIHILATION AB We have measured the forward-backward asymmetry in e+e- --> bbBAR and e+e- --> ccBAR processes using hadronic events containing muons or electrons. The data sample corresponds to 410 000 hadronic decays of the Z0. From a fit to the single lepton and dilepton p and p(T) spectra, we determine A(bbBAR) = 0.086+/-0.015+/-0.007 and A(ccBAR) = 0.083+/-0.038+/-0.027 at the effective center-of-mass energy square root s = 91.24 GeV. These measurements yield a value of the electroweak mixing angle sin2theta(W)BAR = 0.2336+/-0.0029. C1 UNIV FLORENCE, I-50125 FLORENCE, ITALY. CTR INVEST ENERGET MEDIOAMBIENTALES & TECNOL, E-28040 MADRID, SPAIN. BOSTON UNIV, BOSTON, MA 02215 USA. JOHNS HOPKINS UNIV HOSP, BALTIMORE, MD 21218 USA. CERRO TOLOLO INTERAMER OBSERV, EUROPEAN LAB PARTICLE PHYS, LA SERENA, CHILE. IST NAZL FIS NUCL, I-80125 NAPLES, ITALY. NAPLES UNIV, I-80125 NAPLES, ITALY. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. IST NAZL FIS NUCL, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND. SWISS FED INST TECHNOL, CH-8093 ZURICH, SWITZERLAND. MIT, CAMBRIDGE, MA 02139 USA. ST PETERSBURG NUCL PHYS INST, ST PETERSBURG, USSR. BULGARIAN ACAD SCI, BU-1113 SOFIA, BULGARIA. IST NAZL FIS NUCL, I-40126 BOLOGNA, ITALY. MOSCOW THEORET & EXPTL PHYS INST, MOSCOW 117259, USSR. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA. RHEIN WESTFAL TH AACHEN, INST PHYS 3, W-5100 AACHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. IST NAZL FIS NUCL, I-00185 ROME, ITALY. UNIV ROME LA SAPIENZA, I-00185 ROME, ITALY. PRINCETON UNIV, PRINCETON, NJ 08544 USA. UNIV ALABAMA, UNIVERSITY, AL 35486 USA. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. LAB PHYS PARTICULES, F-74941 ANNECY LE VIEUX, FRANCE. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY. NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. CATHOLIC UNIV NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. NIKHEF NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. UNIV CALIF SAN DIEGO, SAN DIEGO, CA 92182 USA. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. UNIV LYON 1, INST PHYS NUCL LYON, CNRS, IN2P3, F-69622 VILLEURBANNE, FRANCE. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. INST HIGH ENERGY, BEIJING, PEOPLES R CHINA. HIGH ENERGY PHYS GRP, TAIPEI, TAIWAN. UNIV SCI & TECHNOL CHINA, HEFEI 230029, PEOPLES R CHINA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. UNIV SANTIAGO, DEPT FIS PARTICULES ELEMENTALES, E-15706 SANTIAGO, SPAIN. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. SHANGHAI INST CERAM, SHANGHAI, PEOPLES R CHINA. DESY, INST HOCHENERGIEPHYS, O-1615 ZEUTHEN, GERMANY. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. CALTECH, PASADENA, CA 91125 USA. HARVARD UNIV, CAMBRIDGE, MA 02139 USA. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. RP ADRIANI, O (reprint author), IST NAZL FIS NUCL, I-50125 FLORENCE, ITALY. RI van der Zwaan, Bob/F-4070-2015; D'Alessandro, Raffaello/F-5897-2015; Chmeissani, Mokhtar/G-4346-2015; Duran, Ignacio/H-7254-2015; rodriguez calonge, francisco javier/H-9682-2015; Hoorani, Hafeez/D-1791-2013; Kamyshkov, Yuri/J-7999-2016; Berdugo, Javier/A-2858-2015; Fiandrini, Emanuele/C-4549-2008; 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 OI van der Zwaan, Bob/0000-0001-5871-7643; D'Alessandro, Raffaello/0000-0001-7997-0306; Chmeissani, Mokhtar/0000-0002-2287-4791; Kamyshkov, Yuri/0000-0002-3789-7152; 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 NR 25 TC 33 Z9 33 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. 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PATRICELLI, S PAUL, T PAULUZZI, M PAUSS, F PEI, YJ PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIND, O RIZVI, HA RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SAJAN, E SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMIEMANN, K SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHUTTE, J SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SODERSTROM, E SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TAYLOR, L TIMMERMANS, C TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A VANDERZWAAN, BCC TI DETERMINATION OF THE NUMBER OF LIGHT NEUTRINO SPECIES SO PHYSICS LETTERS B LA English DT Article ID E+E COLLISIONS AB We have measured the cross-section of the production of single photon events in e+e- collisions near the Z0 resonance. For an integrated luminosity of 9.6 pb-1, we have observed 202 single photon candidates with energy between 0.9 and 3.5 GeV in the polar angular region between 45-degrees and 135-degrees. Assuming that the only stable weakly interacting particles are light neutrinos with standard model couplings, we determine the number of light neutrino species to be N(nu) = 3.14 +/- 0.24 (stat.) +/- 0.12 (syst.). This corresponds to an invisible Z0 width of GAMMA(inv) = 524 +/- 40 +/- 20 MeV. C1 CTR INVEST ENERGET MEDIOAMBIENTALES & TECNOL, E-28040 MADRID, SPAIN. BOSTON UNIV, BOSTON, MA 02215 USA. JOHNS HOPKINS UNIV HOSP, BALTIMORE, MD 21218 USA. CERRO TOLOLO INTERAMER OBSERV, EUROPEAN LAB PARTICULE PHYS, LA SERENA, CHILE. IST NAZL FIS NUCL, I-80125 NAPLES, ITALY. NAPLES UNIV, I-80125 NAPLES, ITALY. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. IST NAZL FIS NUCL, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND. SWISS FED INST TECHNOL, CH-8093 ZURICH, SWITZERLAND. MIT, CAMBRIDGE, MA 02139 USA. ST PETERSBURG NUCL PHYS INST, ST PETERSBURG, USSR. BULGARIAN ACAD SCI, BU-1113 SOFIA, BULGARIA. IST NAZL FIS NUCL, I-40126 BOLOGNA, ITALY. MOSCOW THEORET & EXPTL PHYS INST, MOSCOW 117259, USSR. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA. RHEIN WESTFAL TH AACHEN, INST PHYS 3, W-5100 AACHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. IST NAZL FIS NUCL, I-00185 ROME, ITALY. UNIV ROME LA SAPIENZA, I-00185 ROME, ITALY. PRINCETON UNIV, PRINCETON, NJ 08544 USA. UNIV ALABAMA, UNIVERSITY, AL 35486 USA. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. LAB PHYS PARTICULES, F-74941 ANNECYVIEUX, FRANCE. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST, HUNGARY. NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. CATHOLIC UNIV NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. NIKHEF NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. UNIV CALIF SAN DIEGO, SAN DIEGO, CA 92182 USA. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. UNIV LYON 1, INST PHYS NUCL LYON, CNRS, IN2P3, F-69622 VILLEURBANNE, FRANCE. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. INST HIGH ENERGY, BEIJING, PEOPLES R CHINA. HIGH ENERGY PHYS GRP, TAIPEI, TAIWAN. UNIV SCI & TECHNOL CHINA, HEFEI 230029, PEOPLES R CHINA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. UNIV SANTIAGO, DEPT FIS PARTICULES ELEMENTALES, E-15706 SANTIAGO, SPAIN. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. SHANGHAI INST CERAM, SHANGHAI, PEOPLES R CHINA. DESY, INST HOCHENENERGIEPHYS, O-1615 ZEUTHEN, GERMANY. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. CALTECH, PASADENA, CA 91125 USA. HARVARD UNIV, CAMBRIDGE, MA 02139 USA. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. UNIV FLORENCE, I-50125 FLORENCE, ITALY. RP ADRIANI, O (reprint author), IST NAZL FIS NUCL, I-50125 FLORENCE, ITALY. RI Tsaregorodtsev, Andrei/E-3873-2016; van der Zwaan, Bob/F-4070-2015; D'Alessandro, Raffaello/F-5897-2015; Chmeissani, Mokhtar/G-4346-2015; Duran, Ignacio/H-7254-2015; rodriguez calonge, francisco javier/H-9682-2015; Hoorani, Hafeez/D-1791-2013; Arce, Pedro/L-1268-2014; Kamyshkov, Yuri/J-7999-2016; Gonzalez Romero, Enrique/L-7561-2014; Vogel, Helmut/N-8882-2014; Ferguson, Thomas/O-3444-2014; Berdugo, Javier/A-2858-2015; Fiandrini, Emanuele/C-4549-2008; 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 OI Tsaregorodtsev, Andrei/0000-0003-4618-520X; Diemoz, Marcella/0000-0002-3810-8530; Bertucci, Bruna/0000-0001-7584-293X; Filthaut, Frank/0000-0003-3338-2247; van der Zwaan, Bob/0000-0001-5871-7643; D'Alessandro, Raffaello/0000-0001-7997-0306; Chmeissani, Mokhtar/0000-0002-2287-4791; Arce, Pedro/0000-0003-3009-0484; Kamyshkov, Yuri/0000-0002-3789-7152; Longo, Egidio/0000-0001-6238-6787; Ambrosi, Giovanni/0000-0001-6977-9559; Gonzalez Romero, Enrique/0000-0003-2376-8920; Vogel, Helmut/0000-0002-6109-3023; Ferguson, Thomas/0000-0001-5822-3731; Berdugo, Javier/0000-0002-7911-8532; Leijtens, Xaveer/0000-0001-7794-8236; Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Cerrada, Marcos/0000-0003-0112-1691 NR 20 TC 28 Z9 28 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. 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B PD OCT 15 PY 1992 VL 292 IS 3-4 BP 463 EP 471 DI 10.1016/0370-2693(92)91204-M PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JT867 UT WOS:A1992JT86700039 ER PT J AU ADRIANI, O AGUILARBENITEZ, M AHLEN, S AKBARI, H ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BLUMENFELD, B BOBBINK, GJ BOCCIOLINI, M BOCK, R BOHM, A BORGIA, B BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUISSON, C BUJAK, A BURGER, JD BURGER, WJ BURQ, JP BUSENITZ, J CAI, XD CAPELL, M CARIA, M CARLINO, G CARMINATI, F CARTACCI, AM CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, J CHEN, M CHEN, ML CHEN, WY CHIEFARI, G CHIEN, CY CHMEISSANI, M CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CRIJNS, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DOVA, MT DRAGO, E DRIEVER, T DUCHESNEAU, D DUINKER, P DURAN, I ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GAU, SS GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOTTLICHER, P GOUGAS, A GOUJON, D GRATTA, G GRINNELL, C GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HEBBEKER, T HEBERT, M HERTEN, G HERTEN, U HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KINNISON, WW KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LETTRY, J LEYTENS, X LI, C LI, HT LI, PJ LI, XG LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LINNHOFER, D 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 MAO, DN MAO, YF MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MATSUDA, T MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MEINHOLZ, T MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUSS, F PEI, YJ PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIND, O RIZVI, HA RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SAJAN, E SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMIEMANN, K SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHUTTE, J SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SODERSTROM, E SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TAYLOR, L TIMMERMANS, C TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A VANDERZWAAN, BCC AF ADRIANI, O AGUILARBENITEZ, M AHLEN, S AKBARI, H ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BLUMENFELD, B BOBBINK, GJ BOCCIOLINI, M BOCK, R BOHM, A BORGIA, B BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUISSON, C BUJAK, A BURGER, JD BURGER, WJ BURQ, JP BUSENITZ, J CAI, XD CAPELL, M CARIA, M CARLINO, G CARMINATI, F CARTACCI, AM CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, J CHEN, M CHEN, ML CHEN, WY CHIEFARI, G CHIEN, CY CHMEISSANI, M CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CRIJNS, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DOVA, MT DRAGO, E DRIEVER, T DUCHESNEAU, D DUINKER, P DURAN, I ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GAU, SS GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOTTLICHER, P GOUGAS, A GOUJON, D GRATTA, G GRINNELL, C GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HEBBEKER, T HEBERT, M HERTEN, G HERTEN, U HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KINNISON, WW KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LETTRY, J LEYTENS, X LI, C LI, HT LI, PJ LI, XG LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LINNHOFER, D 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 MAO, DN MAO, YF MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MATSUDA, T MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MEINHOLZ, T MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUSS, F PEI, YJ PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIND, O RIZVI, HA RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SAJAN, E SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMIEMANN, K SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHUTTE, J SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SODERSTROM, E SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TAYLOR, L TIMMERMANS, C TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A VANDERZWAAN, BCC TI ISOLATED HARD PHOTON-EMISSION IN HADRONIC Z0 DECAYS SO PHYSICS LETTERS B LA English DT Article ID LUND MONTE-CARLO; E+E ANNIHILATION; ENERGIES; SEARCH; QUARK; QCD AB We report on a study of energetic, isolated photons in a sample of approximately 320 000 Z0 hadronic decays. Energetic isolated photons probe the short-distance structure of QCD. We compare our data with the prediction of several QCD-based calculations. A search for new processes with one or two photons in the hadronic final state is also presented. No evidence for physics beyond the standard model is found. C1 UNIV FLORENCE, I-50125 FLORENCE, ITALY. CTR INVEST ENERGET MEDIOMBIENTALES & TECNOL, E-28040 MADRID, SPAIN. BOSTON UNIV, BOSTON, MA 02215 USA. JOHNS HOPKINS UNIV HOSP, BALTIMORE, MD 21218 USA. CERRO TOLOLO INTERAMER OBSERV, EUROPEAN LAB PARTICULE PHYS, LA SERENA, CHILE. IST NAZL FIS NUCL, I-80125 NAPLES, ITALY. NAPLES UNIV, I-80125 NAPLES, ITALY. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. IST NAZL FIS NUCL, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND. SWISS FED INST TECHNOL, CH-8093 ZURICH, SWITZERLAND. MIT, CAMBRIDGE, MA 02139 USA. ST PETERSBURG NUCL PHYS INST, ST PETERSBURG, USSR. BULGARIAN ACAD SCI, BU-1113 SOFIA, BULGARIA. IST NAZL FIS NUCL, I-40126 BOLOGNA, ITALY. MOSCOW THEORET & EXPTL PHYS INST, MOSCOW 117259, USSR. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA. RHEIN WESTFAL TH AACHEN, INST PHYS 3, W-5100 AACHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. IST NAZL FIS NUCL, I-00185 ROME, ITALY. UNIV ROME LA SAPIENZA, I-00185 ROME, ITALY. PRINCETON UNIV, PRINCETON, NJ 08544 USA. UNIV ALABAMA, UNIVERSITY, AL 35486 USA. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. LAB PHYS PARTICULES, F-74941 ANNECY LE VIEUX, FRANCE. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST, HUNGARY. NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. CATHOLIC UNIV NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. NIKHEF NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. UNIV CALIF SAN DIEGO, SAN DIEGO, CA 92182 USA. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. UNIV LYON 1, INST PHYS NUCL LYON, CNRS, IN2P3, F-69622 VILLEURBANNE, FRANCE. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. INST HIGH ENERGY, BEIJING, PEOPLES R CHINA. HIGH ENERGY PHYS GRP, TAIPEI, TAIWAN. UNIV SCI & TECHNOL CHINA, HEFEI 230029, PEOPLES R CHINA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. UNIV SANTIAGO, DEPT FIS PARTICULES ELEMENTALES, E-15706 SANTIAGO, SPAIN. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. SHANGHAI INST CERAM, SHANGHAI, PEOPLES R CHINA. DESY, INST HOCHENERGIEPHYS, O-1615 ZEUTHEN, GERMANY. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. CALTECH, PASADENA, CA 91125 USA. HARVARD UNIV, CAMBRIDGE, MA 02139 USA. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. RP ADRIANI, O (reprint author), IST NAZL FIS NUCL, I-50125 FLORENCE, ITALY. RI Tsaregorodtsev, Andrei/E-3873-2016; Fiandrini, Emanuele/C-4549-2008; Leijtens, Xaveer/F-3302-2010; Berdugo, Javier/A-2858-2015; 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; Chmeissani, Mokhtar/G-4346-2015; Duran, Ignacio/H-7254-2015; rodriguez calonge, francisco javier/H-9682-2015; Hoorani, Hafeez/D-1791-2013; Arce, Pedro/L-1268-2014; Kamyshkov, Yuri/J-7999-2016; OI Tsaregorodtsev, Andrei/0000-0003-4618-520X; Diemoz, Marcella/0000-0002-3810-8530; Bertucci, Bruna/0000-0001-7584-293X; Filthaut, Frank/0000-0003-3338-2247; Leijtens, Xaveer/0000-0001-7794-8236; Berdugo, Javier/0000-0002-7911-8532; 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; Chmeissani, Mokhtar/0000-0002-2287-4791; Arce, Pedro/0000-0003-3009-0484; Kamyshkov, Yuri/0000-0002-3789-7152; Longo, Egidio/0000-0001-6238-6787 NR 39 TC 43 Z9 43 U1 1 U2 7 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 OCT 15 PY 1992 VL 292 IS 3-4 BP 472 EP 484 DI 10.1016/0370-2693(92)91205-N PG 13 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JT867 UT WOS:A1992JT86700040 ER PT J AU SINGER, B ANTOCCIA, A BASU, AK DOSANJH, MK FRAENKELCONRAT, H GALLAGHER, PE KUSMIEREK, JT QIU, ZH RYDBERG, B AF SINGER, B ANTOCCIA, A BASU, AK DOSANJH, MK FRAENKELCONRAT, H GALLAGHER, PE KUSMIEREK, JT QIU, ZH RYDBERG, B TI BOTH PURIFIED HUMAN 1,N(6)-ETHENOADENINE-BINDING PROTEIN AND PURIFIED HUMAN 3-METHYLADENINE-DNA GLYCOSYLASE ACT ON 1,N(6)-ETHENOADENINE AND 3-METHYLADENINE SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE DNA REPAIR; DNA ALKYLATION; CYCLIC ADDUCT; VINYL CHLORIDE ID ETHYL CARBAMATE URETHANE; DNA GLYCOSYLASE; VINYL CARBAMATE; HUMAN-CELLS; LIVER DNA; PURIFICATION; CDNA; OXIDATION; CHLORIDE; CLONING AB We previously described a protein, isolated from human tissues and cells, that bound to a defined double-stranded oligonucleotide containing a single site-specifically placed 1,N6-ethenoadenine. It was further demonstrated that this protein was a glycosylase and released 1,N6-ethenoadenine. We now find that this enzyme also releases 3-methyladenine from methylated DNA and that 3-methyladenine-DNA glycosylase behaves in the same manner, binding to the ethenoadenine-containing oligonucleotide and cleaving both ethenoadenine and 3-methyladenine from DNA containing these adducts. The rate and extent of glycosylase activities toward the two adducts are similar. C1 UNIV CONNECTICUT,DEPT CHEM,STORRS,CT 06269. W VIRGINIA UNIV,DEPT BIOL,MORGANTOWN,WV 26506. RP SINGER, B (reprint author), LAWRENCE BERKELEY LAB,DIV LIFE SCI,DONNER LAB,BERKELEY,CA 94720, USA. FU NCI NIH HHS [CA52127, CA47723, CA42736]; NIEHS NIH HHS [R01 ES009127] NR 22 TC 94 Z9 95 U1 0 U2 2 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD OCT 15 PY 1992 VL 89 IS 20 BP 9386 EP 9390 DI 10.1073/pnas.89.20.9386 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JT977 UT WOS:A1992JT97700005 PM 1409645 ER PT J AU HUGHES, DA AF HUGHES, DA TI MICROSTRUCTURE AND FLOW-STRESS OF DEFORMED POLYCRYSTALLINE METALS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID DISLOCATION CELL-SIZE; DEFORMATION; NICKEL; EVOLUTION; ALUMINUM RP HUGHES, DA (reprint author), SANDIA NATL LABS,CTR MAT & APPL MECH,LIVERMORE,CA 94550, USA. NR 19 TC 22 Z9 22 U1 0 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 OCT 15 PY 1992 VL 27 IS 8 BP 969 EP 974 DI 10.1016/0956-716X(92)90458-Q PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JQ413 UT WOS:A1992JQ41300005 ER PT J AU ASHBY, CIH AF ASHBY, CIH TI PATTERN-FORMATION TECHNIQUES IN PHOTOCHEMICAL ETCHING SO THIN SOLID FILMS LA English DT Article ID GALLIUM-ARSENIDE; LASER-BEAM; TEMPERATURE RISE; DIFFRACTION GRATINGS; EXCIMER-LASER; N-INP; IMPURITY CONCENTRATIONS; CONTACT LITHOGRAPHY; GAS ATMOSPHERE; SEMICONDUCTORS AB The principal techniques for pattern formation in photochemical etching are: (i) image projection; (ii) contact or proximity masking; (iii) direct writing; (iv) optical (holographic) interference; (v) patterned pre-etch substrate modification. The applicability of each for a particular purpose is determined both by the intrinsic optical characteristics of the pattern forming technique and by the characteristics of the specific etching process. RP ASHBY, CIH (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 65 TC 6 Z9 6 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD OCT 15 PY 1992 VL 218 IS 1-2 BP 252 EP 258 DI 10.1016/0040-6090(92)90925-2 PG 7 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA JV563 UT WOS:A1992JV56300031 ER PT J AU CHEN, CH PHILLIPS, RC MORRISON, PW AF CHEN, CH PHILLIPS, RC MORRISON, PW TI MONITORING OF PHOTODEPOSITED SUPERCONDUCTIVE FILMS SO THIN SOLID FILMS LA English DT Article ID PULSED LASER DEPOSITION; YBA2CU3O7-DELTA THIN-FILMS; SUPERSONIC MOLECULAR-BEAM; LOW-TEMPERATURE GROWTH; ALUMINUM-GARNET LASER; CU-O FILMS; BUFFER LAYERS; INSITU GROWTH; PLASMA EMISSION; ABLATED YBA2CU3O7-DELTA AB Preparation of superconducting films by laser ablation is one of the most convenient processes for producing high-quality superconductive films. However, the detailed mechanism for this process is still not resolved. This paper reviews the kinetics studied using real-time monitoring of gas species and thin film conditions and hopes to lead to better understanding of the photodeposition process. C1 ADV FUEL RES INC,E HARTFORD,CT 06108. RP CHEN, CH (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 93 TC 1 Z9 1 U1 0 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD OCT 15 PY 1992 VL 218 IS 1-2 BP 291 EP 303 DI 10.1016/0040-6090(92)90929-6 PG 13 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA JV563 UT WOS:A1992JV56300035 ER PT J AU WU, XD FOLTYN, SR DYE, RC GARCIA, AR NOGAR, NS MUENCHAUSEN, RE AF WU, XD FOLTYN, SR DYE, RC GARCIA, AR NOGAR, NS MUENCHAUSEN, RE TI PULSED LASER DEPOSITION OF OXIDE SUPERCONDUCTING THIN-FILMS SO THIN SOLID FILMS LA English DT Article ID YBA2CU3O7-DELTA; EVAPORATION AB Pulsed laser deposition (PLD) is emerging as a popular thin film deposition technique for complex materials, especially metal oxides such as high temperature superconductors. Advantages over other thin film techniques are ease of stoichiometric deposition, high deposition rates, and processing pressure independence. Furthermore, multilayer deposition can be accomplished by simply switching different targets into the laser beam. Two common problems associated with PLD are particle deposition and target modification. In this paper we summarize some of the advantages, difficulties, and future directions of PLD. RP WU, XD (reprint author), LOS ALAMOS NATL LAB,CTR EXPLORATORY RES & DEV,LOS ALAMOS,NM 87545, USA. NR 20 TC 11 Z9 11 U1 1 U2 7 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD OCT 15 PY 1992 VL 218 IS 1-2 BP 310 EP 315 DI 10.1016/0040-6090(92)90931-Z PG 6 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA JV563 UT WOS:A1992JV56300037 ER PT J AU BLEIER, A AF BLEIER, A TI SECONDARY MINIMUM INTERACTIONS AND HETEROCOAGULATION ENCOUNTERED IN THE AQUEOUS PROCESSING OF ALUMINA ZIRCONIA CERAMIC COMPOSITES SO COLLOIDS AND SURFACES LA English DT Article DE ALUMINA-ZIRCONIA COMPOSITES; AQUEOUS PROCESSING; HETEROCOAGULATION CALCULATIONS; SECONDARY MINIMUM INTERACTIONS ID OXIDE-WATER INTERFACE; POLYVINYL-CHLORIDE LATEX; HEALY-FUERSTENAU FORMULAS; DISSIMILAR DOUBLE-LAYERS; ELECTRICAL DOUBLE-LAYER; SITE-BINDING MODEL; LUDOX HS SILICA; SURFACE-IONIZATION; HYDRATION FORCES; COMPLEXATION AB Heterocoagulation calculations are used to explain the various colloidal stability phenomena encountered in aqueous binary suspensions that contain alumina and zirconia. Differential sedimentation of the particulates leads to a non-uniform oxide distribution in the pellets prepared by the pressure filtration of stable systems, yet consolidation under the conditions that promote a weak secondary minimum association of the dissimilar oxides makes the microstructures in the pellets uniform. This effect depends on the filtration pH. The mutual association is favored in stable systems if the zeta potentials of the unlike particles are of the same sign but differ significantly in magnitude. The best consolidation conditions for this binary system occur in the pH range 5-6, where each oxide is positively charged. The critical depths of the secondary minimum depend on the particle sizes and may exceed 10kT. Pre-exposure of zirconia to aluminum chloride and pre-exposure of each oxide to polyacrylic acid can alter the material distribution in pellets made from colloidally stable systems. Either additive's effect depends on its concentration and the filtration pH. Adsorption of either aluminum-containing species or polymer makes the heteroassociation of alumina and zirconia particles less favorable. RP BLEIER, A (reprint author), OAK RIDGE NATL LAB, DIV MET & CERAM, POB 2008, OAK RIDGE, TN 37831 USA. NR 59 TC 18 Z9 18 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-6622 J9 COLLOID SURFACE PD OCT 14 PY 1992 VL 66 IS 3 BP 157 EP 179 DI 10.1016/0166-6622(92)80190-D PG 23 WC Chemistry, Physical SC Chemistry GA JV182 UT WOS:A1992JV18200001 ER PT J AU ECKERT, J ALBINATI, A WHITE, RP BIANCHINI, C PERUZZINI, M AF ECKERT, J ALBINATI, A WHITE, RP BIANCHINI, C PERUZZINI, M TI THE BARRIER TO ROTATION OF THE DIHYDROGEN LIGAND IN THE COMPLEXES [MH(ETA-2-H2)PP3]BPH4 (M = FE, RU) - EVIDENCE FOR STRONGER BACK-DONATION IN THE IRON COMPLEX SO INORGANIC CHEMISTRY LA English DT Article ID MOLECULAR-HYDROGEN COMPLEXES; VARIABLE-TEMPERATURE T1; NEUTRON-DIFFRACTION; XENON SOLUTION; SOLID-STATE; X-RAY; METAL; ETA-2-DIHYDROGEN; DIHYDRIDE; H-2 AB The barrier to rotation of the dihydrogen ligand in the complexes [MH(eta2-H2)PP3]BPh4, M = Fe, Ru, was determined from inelastic neutron scattering studies of the dihydrogen rotational energy levels. Our results demonstrate unambiguously that this barrier is higher in the Fe complex than in the Ru analog. With the assumption of a simple 2-fold barrier our analysis yields heights of 1.82 and 1.36 kcal/mol, respectively, where the rotational constant for the molecular hydrogen ligand (B = 43 cm-1) was calculated from a value for the H-H distance of 0.87 A given by the NMR results of Morris and collaborators on related complexes. Since previous studies have shown that this barrier has its origin primarily in the back-donation from the metal to the antibonding orbital of the dihydrogen, one may conclude that the Fe center is a better back-donor than Ru, contrary to what general trends in the periodic table would lead one to expect. This result provides direct support for a hypothesis made by Morris and collaborators to explain their NMR results on a different series of dihydrogen complexes of the Fe group. C1 UNIV MILANO,IST CHIM FARMACEUT,I-20131 MILAN,ITALY. CNR,IST STUDIO STEREOCHIM & ENERGET COMPOSTI COORDINAZ,I-50132 FLORENCE,ITALY. INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE. RP ECKERT, J (reprint author), LOS ALAMOS NATL LAB,LANSCE,LOS ALAMOS,NM 87545, USA. RI Peruzzini, Maurizio/M-1705-2014; Albinati, Alberto/I-1262-2015 OI Peruzzini, Maurizio/0000-0002-2708-3964; Albinati, Alberto/0000-0002-8779-3327 NR 36 TC 35 Z9 35 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD OCT 14 PY 1992 VL 31 IS 21 BP 4241 EP 4244 DI 10.1021/ic00047a007 PG 4 WC Chemistry, Inorganic & Nuclear SC Chemistry GA JT910 UT WOS:A1992JT91000007 ER PT J AU KELSON, I NIR, D RINGLER, G HAUSTEIN, PE AF KELSON, I NIR, D RINGLER, G HAUSTEIN, PE TI STUDY OF THE CHARGED COMPONENT IN NUCLEAR STIMULATED DESORPTION SO JOURNAL OF PHYSICS D-APPLIED PHYSICS LA English DT Article ID DELAYED DESORPTION AB A series of measurements of nuclear stimulated desorption was performed for compounds containing the isotopes 47Ca and Mo-99. A persistent charged component was observed in the desorbed flux of Sc-47 resulting from the decay of 47Ca. A transient charged component in the flux of Tc-99m was detected for some chemical forms of the Mo-99 compound. C1 SOREQ NUCL RES CTR,DEPT RADIOPHARMACEUT,IL-70600 YAVNE,ISRAEL. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RP KELSON, I (reprint author), TEL AVIV UNIV,RAYMOND & BEVERLY SACKLER FAC EXACT SCI,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. NR 6 TC 1 Z9 1 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 OCT 14 PY 1992 VL 25 IS 10 BP 1545 EP 1549 DI 10.1088/0022-3727/25/10/024 PG 5 WC Physics, Applied SC Physics GA JV227 UT WOS:A1992JV22700024 ER PT J AU LIAO, DI BREDDAM, K SWEET, RM BULLOCK, T REMINGTON, SJ AF LIAO, DI BREDDAM, K SWEET, RM BULLOCK, T REMINGTON, SJ TI REFINED ATOMIC MODEL OF WHEAT SERINE CARBOXYPEPTIDASE-II AT 2.2-ANGSTROM RESOLUTION SO BIOCHEMISTRY LA English DT Article ID CRYSTAL-STRUCTURE; MACROMOLECULAR CRYSTALLOGRAPHY; SUBTILISIN CARLSBERG; GAMMA-CHYMOTRYPSIN; PROTECTIVE PROTEIN; CATALYTIC TRIAD; EGLIN-C; PROTEASES; INHIBITOR; TRYPSIN AB The crystal structure of the homodimeric serine carboxypeptidase II from wheat (CPDW-II, M(r) 120K) has been determined and fully refined at 2.2-angstrom resolution to a standard crystallographic R factor of 16.9% using synchrotron data collected at the Brookhaven National Laboratory. The model has an rms deviation from ideal bond lengths of 0.018 angstrom and from bond angles of 2.8-degrees. The model supports the general conclusions of an earlier study at 3.5-angstrom resolution and will form the basis for investigation into substrate binding and mechanistic studies. The enzyme has an alpha+beta fold, consisting of a central 11-stranded beta-sheet with a total of 15 helices on either side. The enzyme, like other serine proteinases, contains a "catalytic triad' Ser146-His397-Asp338 and a presumed "oxyanion hole" consisting of the backbone amides of Tyr147 and Gly53. The carboxylate of Asp338 and imidazole of His397 are not coplanar in contrast to the other serine proteinases. A comparison of the active site features of the three families of serine proteinases suggests that the "catalytic triad" should actually be regarded as two diads, a His-Asp diad and a His-Ser diad, and that the relative orientation of one diad with respect to the other is not particularly important. Four active site residues (52, 53, 65, and 146) have unfavorable backbone conformations but have well-defined electron density, suggesting that there is some strain in the active site region. The binding of the free amino acid arginine has been analyzed by difference Fourier methods, locating the binding site for the C-terminal carboxylate of the leaving group. The carboxylate makes hydrogen bonds to Glu145, Asn51, and the amide of Gly52. The carboxylate of Glu145 also makes a hydrogen bond with that of Glu65, suggesting that one or both may be protonated. Thus, the loss of peptidase activity at pH > 7 may in part be due to deprotonation of Glu145. The active site does not reveal exposed peptide amides and carbonyl oxygen atoms that could interact with substrate in an extended beta-sheet fashion. The fold of the polypeptide backbone is completely different than that of trypsin or subtilisin, suggesting that this is a third example of convergent molecular evolution to a common enzymatic activity, Furthermore, it is suggested that the active site sequence motif "G-X-S-X-G/A", often considered the hallmark of serine peptidase or esterase activity, is fortuitous and not the result of divergent evolution. However, the fold of CPDW-II has a remarkable similarity to four other classes of hydrolytic enzymes for which representative structures have recently been determined. These are the acetylcholine esterase, several triacylglycerol lipases, haloalkane dehalogenase, and dienelactone hydrolase. Thus, serine carboxypeptidases are suggested to illustrate the process of both convergent and divergent molecular evolution. A comparison of the amino acid sequences of human serine carboxypeptidase carbL, or "protective protein", and CPDW-II suggests that the dimer of CPDW-II may be a reasonable model for the dimer of the human enzyme and that the dimer interface is similar in the two proteins. This may be useful toward the understanding of human genetic disorders such as galactosialidosis, which can result from lesions in this locus [Zhou, X. Y., Galjart, N. J., Willemsen, R., Gillemans, N., Galjaard, H., & d'Azzo, A. (1991) EMBO J. 10, 4041-4048]. C1 UNIV OREGON,INST MOLEC BIOL,EUGENE,OR 97403. UNIV OREGON,DEPT PHYS,EUGENE,OR 97403. CARLSBERG LAB,DEPT CHEM,DK-2500 COPENHAGEN,DENMARK. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. NR 65 TC 127 Z9 129 U1 2 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 OCT 13 PY 1992 VL 31 IS 40 BP 9796 EP 9812 DI 10.1021/bi00155a037 PG 17 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JT518 UT WOS:A1992JT51800037 PM 1390755 ER PT J AU KILLEEN, KP AF KILLEEN, KP TI REACTIVE CHEMICAL INTERMEDIATES IN METALORGANIC CHEMICAL VAPOR-DEPOSITION OF GAAS SO APPLIED PHYSICS LETTERS LA English DT Article ID THERMAL-DECOMPOSITION; MOCVD; TRIMETHYLGALLIUM; GROWTH; SPECTROSCOPY; KINETICS; ARSINE; INSITU; INP AB Reactive chemical gas-phase intermediate species important in the metalorganic chemical vapor deposition growth process of GaAs have been identified for the first time using in situ ultraviolet absorption spectroscopy. Spectral features from Ga, GaH, and GaCH3 were observed during thermal decomposition of trimethylgallium (TMGa) in hydrogen gas. Evidence for free radical reactions involving CH3 and H in the pyrolysis of TMGa is presented. The addition of arsine to the mixture is found to change the reaction pathways as evident from the production of AsH2 and the disappearance of Ga and GaH. Gas-phase decomposition of the metalorganic species in hydrogen can produce gallium under the conditions of high pressure atomic layer epitaxy. RP KILLEEN, KP (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI Schaff, William/B-5839-2009 NR 19 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 12 PY 1992 VL 61 IS 15 BP 1864 EP 1866 DI 10.1063/1.108399 PG 3 WC Physics, Applied SC Physics GA JR733 UT WOS:A1992JR73300041 ER PT J AU LARIMER, FW HSU, CL MAUPIN, MK STEVENS, A AF LARIMER, FW HSU, CL MAUPIN, MK STEVENS, A TI CHARACTERIZATION OF THE XRN1 GENE ENCODING A 5'-]3' EXORIBONUCLEASE - SEQUENCE DATA AND ANALYSIS OF DISPARATE PROTEIN AND MESSENGER-RNA LEVELS OF GENE-DISRUPTED YEAST-CELLS SO GENE LA English DT Article DE CELL SIZE; HALF-LIVES; MACROMOLECULE LEVELS; PROTEIN SYNTHESIS; MESSENGER RNA TURNOVER; MESSENGER SYNTHESIS ID SACCHAROMYCES-CEREVISIAE; STRAND EXCHANGE; PURIFICATION; BETA; ISO-1-CYTOCHROME-C; TRANSCRIPTION; SPECIFICITY; HYDROLYSIS; STABILITY; MUTATIONS AB Sequencing of the XRN1 gene of Saccharomyces cerevisiae, cloned in this laboratory as a gene encoding a 160-kDa 5' --> 3' exoribonuclease (XRN1), shows that it is identical to a gene (DST2 or SEP1) encoding a DNA strand transferase and to genes involved in nuclear fusion, KEM1, and plasmid stability, RAR5. To better understand the various phenotypes associated with loss of XRN1 and the enzymatic activities associated with the protein, certain characteristics of our yeast cells lacking an active gene (xm1) have been examined. Cells are larger (average volume is x 1.5-1.8) and have an increased doubling time (x 1.9-2.1). The protein synthesis rate per cell is 80-90% that of wild-type (wt) cells, and the resultant cellular protein levels are higher. The rate of the 25S and 18S rRNA synthesis is approximately 45% that of wt cells and its cellular level is about 90% that of wt cells. Levels of protein bands resolved by one-dimensional PAGE show substantial differences. Synthesis rates observed for the same protein bands, as well as measurements of several specific mRNA levels by Northern analysis, suggest disparities in mRNA levels. Results show two to four times longer half-lives of specific short-lived mRNAs. The variations in levels of protein and RNA species found in the xrn1 cells may be the cause of some of the phenotypes found associated with gene loss. C1 OAK RIDGE NATL LAB, DIV BIOL, OAK RIDGE, TN 37831 USA. FU NCI NIH HHS [CA 09336]; NIGMS NIH HHS [GM42144] NR 33 TC 109 Z9 110 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-1119 EI 1879-0038 J9 GENE JI Gene PD OCT 12 PY 1992 VL 120 IS 1 BP 51 EP 57 DI 10.1016/0378-1119(92)90008-D PG 7 WC Genetics & Heredity SC Genetics & Heredity GA JR811 UT WOS:A1992JR81100007 PM 1398123 ER PT J AU REVIOL, W CARPENTER, MP GARG, U JANSSENS, RVF AHMAD, I BEARDEN, IG BENET, P DALY, PJ DRIGERT, MW FERNANDEZ, PB KHOO, TL MOORE, EF PILOTTE, S YE, D AF REVIOL, W CARPENTER, MP GARG, U JANSSENS, RVF AHMAD, I BEARDEN, IG BENET, P DALY, PJ DRIGERT, MW FERNANDEZ, PB KHOO, TL MOORE, EF PILOTTE, S YE, D TI SHAPE-DRIVING EFFECTS IN TL-193 FROM THE SPECTROSCOPY OF YRAST AND NEAR-YRAST STATES SO NUCLEAR PHYSICS A LA English DT Article DE GD-160(CL-37,4N), E = 167 MEV; MEASURED E(GAMMA), I(GAMMA,GAMMA-GAMMA-COIN; DCO RATIOS; 193TL, DEDUCED LEVELS, J, PI, BAND STRUCTURES; DEFORMATION; ENRICHED TARGETS; COMPTON-SUPPRESSED GE DETECTORS; 4-PI BGO ARRAY; TRS AND CSM CALCULATIONS ID HIGH-SPIN; SUPERDEFORMED BANDS; NUCLEI; EXCITATIONS; ALIGNMENT; GD-148; SHELL AB The nucleus Tl-193 has been populated with the Gd-160(Cl-37, 4n) reaction and its level scheme has been extended up to spin 41/2HBAR by using an array of 12 Compton-suppressed Ge detectors. Near-oblate band structures arising from a 9-/2 state and markedly different, single-particle-like, structures above a 13+/2 state have been established. The two structures are consistent with total routhian surface calculations indicating the existence of two minima in the total routhian surface of the nucleus which survive separately up to the observed spins. Details of the rotational-like part are discussed in terms of the cranked shell model, while the single-particle-like features of the nucleus are compared with non-collective structures in neighboring nuclei, in particular 191Hg. C1 ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907. EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37966. RP REVIOL, W (reprint author), UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556, USA. RI Bearden, Ian/M-4504-2014; Carpenter, Michael/E-4287-2015 OI Bearden, Ian/0000-0003-2784-3094; Carpenter, Michael/0000-0002-3237-5734 NR 31 TC 17 Z9 17 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 OCT 12 PY 1992 VL 548 IS 2 BP 331 EP 352 DI 10.1016/0375-9474(92)90014-B PG 22 WC Physics, Nuclear SC Physics GA JV877 UT WOS:A1992JV87700007 ER PT J AU SURO, J CHAN, YD SCARPACI, JA STOKSTAD, RG AF SURO, J CHAN, YD SCARPACI, JA STOKSTAD, RG TI PROJECTILE BREAKUP OF O-16 AT 32.5 MEV/A - COMPARISON OF A CLASSICAL DYNAMIC-MODEL WITH EXPERIMENT SO NUCLEAR PHYSICS A LA English DT Article DE AU-197(O-16,4-ALPHA),E = 32.5 MEV/A NUCLEON; MEASURED MULTIPLE BREAKUP OF PROJECTILE; COMPARISON WITH CLASSICAL DYNAMIC REACTION MODEL TO EXPERIMENT ID MEV NUCLEON; HEAVY-IONS; NE-20; DISSOCIATION; COLLISIONS; PARTICLES AB A comparison is made of a classical dynamical model for the reaction of alpha-particle-conjugate projectiles on heavy targets with experimental data for the breakup of O-16 into four alpha particles. Theoretical events generated by a Monte Carlo method are "filtered" through the angular and energy constraints of the detector array. The agreement is good. The effects of the filtering and particle-particle correlations are discussed. C1 LAWRENCE BERKELEY LAB,DIV NUCL SCI,1 CYCLOTRON RD,BLDG 88,BERKELEY,CA 94720. HAHN MEITNER INST KERNFORSCH BERLIN GMBH,BEREICH SCHWERIONENPHYS,W-1000 BELRIN 38,GERMANY. NR 14 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 OCT 12 PY 1992 VL 548 IS 2 BP 353 EP 364 DI 10.1016/0375-9474(92)90015-C PG 12 WC Physics, Nuclear SC Physics GA JV877 UT WOS:A1992JV87700008 ER PT J AU ABE, F AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, 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 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 CURATOLO, M 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 ESPOSITO, B ETCHEGOYEN, A FARHAT, B 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 GOULIANOS, K GRASSMANN, H GRIECO, GM GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HONG, S 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 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 LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A 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 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 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 SCRIBANO, A SEGLER, S SEIYA, Y SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPHICAS, P STDENIS, R STEFANINI, A SULLIVAN, G 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 TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WU, D WYSS, J YAGIL, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZUCCHELLI, S AF ABE, F AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, 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 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 CURATOLO, M 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 ESPOSITO, B ETCHEGOYEN, A FARHAT, B 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 GOULIANOS, K GRASSMANN, H GRIECO, GM GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HONG, S 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 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 LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A 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 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 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 SCRIBANO, A SEGLER, S SEIYA, Y SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPHICAS, P STDENIS, R STEFANINI, A SULLIVAN, G 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 TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WU, D WYSS, J YAGIL, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZUCCHELLI, S TI LIMIT ON THE RARE DECAY W+/--]GAMMA-PI+/- IN P(P)OVER-BAR COLLISIONS AT ROOT-S=1.8TEV SO PHYSICAL REVIEW LETTERS LA English DT Article AB We search for the rare decay W+/- --> gammapi+/- in 4.2 pb-1 of ppBAR collisions recorded with the Collider Detector at Fermilab. At the 95% confidence level, we find an upper limit on the partial decay width to be GAMMA(W+/- --> gammapi+/-)/GAMMA(W+/- --> e+/- nu) less-than-or-equal-to 7.5 x 10(-3). C1 ARGONNE NATL LAB, ARGONNE, IL 60439 USA. BRANDEIS UNIV, WALTHAM, MA 02254 USA. UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA. UNIV CHICAGO, CHICAGO, IL 60637 USA. DUKE UNIV, DURHAM, NC 27706 USA. FERMI NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. IST NAZL FIS NUCL, LAB NAZL FRASCATI, FRASCATI, ITALY. HARVARD UNIV, CAMBRIDGE, MA 02138 USA. UNIV ILLINOIS, URBANA, IL 61801 USA. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. MIT, CAMBRIDGE, MA 02139 USA. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. UNIV PADUA, IST NAZL FIS NUCL, I-35131 PADUA, ITALY. UNIV PENN, PHILADELPHIA, PA 19104 USA. UNIV PISA, IST NAZL FIS NUCL, I-56100 PISA, ITALY. SCUOLA NORMALE SUPER PISA, I-56100 PISA, ITALY. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. UNIV ROCHESTER, ROCHESTER, NY 14627 USA. ROCKEFELLER UNIV, NEW YORK, NY 10021 USA. RUTGERS STATE UNIV, PISCATAWAY, NJ 08854 USA. TEXAS A&M UNIV SYST, COLL STN, TX 77843 USA. UNIV TSUKUBA, TSUKUBA, IBARAKI 305, JAPAN. TUFTS UNIV, MEDFORD, MA 02155 USA. UNIV WISCONSIN, MADISON, WI 53706 USA. RP ABE, F (reprint author), NATL LAB HIGH ENERGY PHYS, TSUKUBA, IBARAKI 305, JAPAN. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Punzi, Giovanni/J-4947-2012; Kim, Soo-Bong/B-7061-2014 OI Chiarelli, Giorgio/0000-0001-9851-4816; Punzi, Giovanni/0000-0002-8346-9052; NR 14 TC 5 Z9 5 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 12 PY 1992 VL 69 IS 15 BP 2160 EP 2163 DI 10.1103/PhysRevLett.69.2160 PG 4 WC Physics, Multidisciplinary SC Physics GA JR648 UT WOS:A1992JR64800003 ER PT J AU MOOK, HA CHAKOUMAKOS, BC MOSTOLLER, M BOOTHROYD, AT PAUL, DM AF MOOK, HA CHAKOUMAKOS, BC MOSTOLLER, M BOOTHROYD, AT PAUL, DM TI PHONONS AND SUPERCONDUCTIVITY IN BI2SR2CACU2O8 SO PHYSICAL REVIEW LETTERS LA English DT Article ID TEMPERATURE; TC; TRANSITION AB Detailed neutron scattering measurements have been made for selected phonons for Bi2Sr2CaCu2O8. The temperature dependence of the linewidths indicates large anharmonic effects particularly for the oxygen modes. The superconductivity induced change in width below T(c) of the two highest energy oxygen modes is found to be nearly 2% of the phonon energy suggesting a large electron-phonon coupling. C1 UNIV WARWICK,DEPT PHYS,COVENTRY CV4 7AL,W MIDLANDS,ENGLAND. RP MOOK, HA (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37830, USA. RI Chakoumakos, Bryan/A-5601-2016 OI Chakoumakos, Bryan/0000-0002-7870-6543 NR 15 TC 44 Z9 44 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 12 PY 1992 VL 69 IS 15 BP 2272 EP 2275 DI 10.1103/PhysRevLett.69.2272 PG 4 WC Physics, Multidisciplinary SC Physics GA JR648 UT WOS:A1992JR64800031 ER PT J AU KRUSINELBAUM, L CIVALE, L VINOKUR, VM HOLTZBERG, F AF KRUSINELBAUM, L CIVALE, L VINOKUR, VM HOLTZBERG, F TI PHASE-DIAGRAM OF THE VORTEX-SOLID PHASE IN Y-BA-CU-O CRYSTALS - A CROSSOVER FROM SINGLE-VORTEX (1D) TO COLLECTIVE (3D) PINNING REGIMES SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGH-TC SUPERCONDUCTORS; FLUX-CREEP; II SUPERCONDUCTORS; YBA2CU3O7-DELTA; MAGNETIZATION; DEPENDENCE; CURRENTS AB We construct a "phase diagram" of the vortex-solid phase of Y-Ba-Cu-O crystals by making a first overall connection of the shape of the magnetic hysteresis M(H,T) with the single-vortex (1D) and collective (3D) pinning regimes. The crossovers between different regimes are visualized from contours of constant J(c) in the H-T plane. We identify the transition from 1D to 3D pinning, and from the nonlocal into a local behavior of vortex bundles in the collective pinning regime. A direct correlation between M(H) and the thermal relaxation rate is demonstrated. We also identify a signature of the thermal softening boundary at which thermal fluctuations on the scale of the coherence length xi are relevant. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP KRUSINELBAUM, L (reprint author), IBM RES,YORKTOWN HTS,NY 10598, USA. NR 22 TC 224 Z9 225 U1 0 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 12 PY 1992 VL 69 IS 15 BP 2280 EP 2283 DI 10.1103/PhysRevLett.69.2280 PG 4 WC Physics, Multidisciplinary SC Physics GA JR648 UT WOS:A1992JR64800033 ER PT J AU LAWRENCE, TW GOODMAN, DM JOHANSSON, EM FITCH, JP AF LAWRENCE, TW GOODMAN, DM JOHANSSON, EM FITCH, JP TI SPECKLE IMAGING OF SATELLITES AT THE UNITED-STATES-AIR-FORCE MAUI OPTICAL STATION SO APPLIED OPTICS LA English DT Article ID INTERFEROMETRY; RECOVERY; IMAGES; PHASE AB Results are presented from a series of experiments in which the U.S. Air Force Maui Optical Station's 1.6-m telescope and a bare CCD speckle camera system were used to image satellites at distances of up to 1000 km. A brief overview of the image reconstruction algorithms is presented. The choice of the experiment site and various imaging parameters are described. Power spectra and power spectral signal-to-noise ratio curves that result from imaging several point stars are compared with theory. Reconstructed images of several binary stars are shown as a base-line assessment of our technique. High-quality image reconstructions of an Earth-satellite, the Hubble Space Telescope, are presented. The results confirm that speckle imaging techniques can be used with a bare CCD imaging system to provide a powerful and flexible method for imaging objects of moderate magnitude. RP LAWRENCE, TW (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-495,LIVERMORE,CA 94550, USA. NR 17 TC 22 Z9 26 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD OCT 10 PY 1992 VL 31 IS 29 BP 6307 EP 6321 PG 15 WC Optics SC Optics GA JQ534 UT WOS:A1992JQ53400023 PM 20733846 ER PT J AU CARLSON, ED MACHACEK, ME HALL, LJ AF CARLSON, ED MACHACEK, ME HALL, LJ TI SELF-INTERACTING DARK MATTER SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMOLOGY, THEORY; DARK MATTER; EARLY UNIVERSE AB A new type of dark matter is considered. As with cold dark matter, when the dark matter is nonrelativistic it does not couple to the electron-photon plasma, so its entropy per comoving volume is fixed. The new feature is that there is a cosmological era where number-changing reactions keep the dark matter in chemical equilibrium so that the chemical potential vanishes. This has several interesting consequences: during this era the dark matter cannibalizes its rest mass to keep warm, its temperature dropping only logarithmically with scale. The energy density and density perturbations of the dark matter also have unusual scale dependences, modified by logarithms compared to usual cold dark matter. We have done a general study of such self-interacting dark matter to identify the interesting ranges for its mass, coupling, and entropy. There are two consequences of this scheme which are particularly noteworthy. The unusual evolution of energy density and density perturbations allows for the possibility of decreasing the predicted anisotropies in the cosmic microwave background by a factor of 2 or more. This dark matter allows a completely new scheme for processing density perturbations. The theory introduces a new cosmological mass scale: the Jeans mass when the number-changing processes decouple. Perturbations on this supercluster scale are the first to go nonlinear. Unlike hot dark matter, density perturbations on galactic scales are not negligible. C1 NORTHEASTERN UNIV,DEPT PHYS,BOSTON,MA 02115. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV PHYS,THEORET PHYS GRP,BERKELEY,CA 94720. RP CARLSON, ED (reprint author), HARVARD UNIV,LYMAN LAB PHYS,CAMBRIDGE,MA 02138, USA. NR 12 TC 95 Z9 95 U1 2 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 10 PY 1992 VL 398 IS 1 BP 43 EP 52 DI 10.1086/171833 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JQ397 UT WOS:A1992JQ39700004 ER PT J AU GAZTANAGA, E AF GAZTANAGA, E TI N-POINT CORRELATION-FUNCTIONS IN THE CFA AND SSRS REDSHIFT DISTRIBUTION OF GALAXIES SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, CLUSTERING; LARGE-SCALE STRUCTURE OF THE UNIVERSE ID INVARIANT MATTER DISTRIBUTION; DENSITY-FLUCTUATIONS; STATISTICAL-ANALYSIS; UNIVERSE; CATALOGS; 2-POINT; OBJECTS AB Using counts in cells, we estimate the volume-average N-point galaxy correlation functions xi(N)(R)BAR for N = 2, 3, and 4, in redshift samples of the CfA and SSRS catalogs. Volume-limited samples of different sizes are used to study the uncertainties at different scales, the shot noise, and the problem with the boundaries. For each sample, a power law is obtained for the density contrast in a spherical cell of radius R: xi2(R)BAR = (R0/R)gamma, in agreement with previous estimations. For higher order correlations we found in all samples a good agreement with the hierarchical symmetry: xi(N)BAR = S(N)xi2N-1BAR for scales R between 2 and 22 Mpc, which included both mildly linear, xi2BAR > 1, and nonlinear, xi2BAR < 1, scales. The hierarchical constants S3 and S4 agree well in all samples in CfA and SSRS, with average S3 = 1.94 +/- 0.07 and S4 = 4.56 +/- 0.53. We compare these results with estimates obtained from angular catalogs and recent analysis over IRAS samples. The amplitudes S(J) seem larger in real space than in redshift space, although the values from the angular analysis correspond to smaller scales, where we might expect larger nonperturbative effects. It is also found that S3 and S4 are smaller for IRAS than for optical galaxies. This, together with the fact that IRAS galaxies have smaller amplitude for xi2(R)BAR, indicates that the density fluctuations of IRAS galaxies cannot be simply proportional to the density fluctuations of optical galaxies, i.e., biasing has to be nonlinear between them. RP GAZTANAGA, E (reprint author), FERMI NATL ACCELERATOR LAB,NASA FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510, USA. RI Gaztanaga, Enrique/L-4894-2014 OI Gaztanaga, Enrique/0000-0001-9632-0815 NR 29 TC 93 Z9 93 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 10 PY 1992 VL 398 IS 1 BP L17 EP L20 DI 10.1086/186566 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JQ396 UT WOS:A1992JQ39600005 ER PT J AU SZPAK, S MOSIERBOSS, PA SCHARBER, SR SMITH, JJ AF SZPAK, S MOSIERBOSS, PA SCHARBER, SR SMITH, JJ TI CHARGING OF THE PD/NH SYSTEM - ROLE OF THE INTERPHASE SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID GALVANOSTATIC DESORPTION; HYDROGEN; PALLADIUM; DEUTERIUM; PD; ABSORPTION; ELECTRODES; LAYERS; ACID AB The dynamics of transport of electrochemically generated deuterium across the electrode/electrolyte interphase was examined by slow scan (10 mV s-1) voltammetry. The investigation covers the potential range -1.2 to +0.4 V measured vs. an Ag/AgCl reference. It was found that a coupled, two-layer model of the interphase describes the observed behavior as a function of scan rate and electrolyte composition. The effect of chemisorbing species, e.g. CN- ions, as well as reactive species, e.g. SC(NH2)2, on the transport across the interphase is also discussed. Results are contrasted with those obtained for light water. C1 US DOE,WASHINGTON,DC 20585. RP SZPAK, S (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 23 TC 27 Z9 27 U1 1 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD OCT 10 PY 1992 VL 337 IS 1-2 BP 147 EP 163 DI 10.1016/0022-0728(92)80534-B PG 17 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA JT128 UT WOS:A1992JT12800007 ER PT J AU GANGOPADHYAY, AK BALACHANDRAN, U POEPPEL, RB AF GANGOPADHYAY, AK BALACHANDRAN, U POEPPEL, RB TI FLUX PINNING AND IRREVERSIBILITY TEMPERATURE IN MELT-GROWN, QUENCH-MELT-GROWN, AND SINTERED YBA2CU3O6+Y SUPERCONDUCTORS SO PHYSICA C LA English DT Article ID CU-O CRYSTAL; OXIDE SUPERCONDUCTORS; CURRENT-DENSITY; CREEP; PHASE; MICROSTRUCTURE; FIELDS AB The intragranular critical current density J(c), the apparent pinning potential U0, and the irreversibility temperature T(irr) of melt-grown (MG), quench-melt-grown (QMG), and sintered YBa2Cu3O6+y (123) were studied. A systematic increase in U0 and a slower drop in J(c) with temperature and magnetic field have been observed as one progresses from sintered 123 to the QMG and MG 123. Contrary to expectation, the somewhat weaker pinning in the QMG 123 compared to the MG 123 indicates no significant role of the size or amount of Y2BaCuO5 (211) precipitates in flux pinning within the range of present study. The T(irr) line shifts to higher temperatures with increasing pinning and follows a power law 1-T(irr)/T(c)=AH(n), where A and n are sample-dependent values related to the flux pinning properties of the samples. The implication of this result for theoretical models is discussed. C1 ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439. NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208. NR 25 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD OCT 10 PY 1992 VL 201 IS 1-2 BP 6 EP 12 DI 10.1016/0921-4534(92)90097-V PG 7 WC Physics, Applied SC Physics GA JT407 UT WOS:A1992JT40700002 ER PT J AU LEE, MH TEA, N SONG, YQ HALPERIN, WP THIEL, J KENNARD, MA POEPPELMEIER, KR FANG, MM WELP, U AF LEE, MH TEA, N SONG, YQ HALPERIN, WP THIEL, J KENNARD, MA POEPPELMEIER, KR FANG, MM WELP, U TI MAGNETIC-SUSCEPTIBILITY ANISOTROPY OF GRAIN-ALIGNED OXYGEN-DEFICIENT Y1BA2CU3OX (6.46-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-6.98) SO PHYSICA C LA English DT Article ID NORMAL-STATE; NUCLEAR-RELAXATION; YBA2CU3O7; SUPERCONDUCTIVITY; BEHAVIOR; TC; ANTIFERROMAGNETISM; STOICHIOMETRY AB The anisotropic susceptibility of YBa2Cu3Ox (6.46 less-than-or-equal-to x less-than-or-equal-to 6.98) has been measured as a function of oxygen composition. Samples were prepared by a high temperature zirconium-getter annealing technique followed by magnetic orientation in epoxy. The normal state magnetic susceptibility was found to be weakly dependent on temperature. The room temperature values of the susceptibility decrease linearly as the oxygen composition decreases, whereas the difference in susceptibilities for magnetic fields parallel and perpendicular to the c-axis is nearly constant. This suggests that in this range of oxygen composition the susceptibility anisotropy comes mostly from the anisotropic part of the Van Vleck susceptibility and the spin susceptibility remains nearly isotropic. Neutron diffraction results show a significant oxygen occupancy at the O(5) site. Nuclear quadrupolar and magnetic resonance spectra of the plane copper indicate a marked degree of electronic disorder, confirming that there are microscopic structural effects from the high temperature zirconium-getter annealing procedure. C1 NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208. NORTHWESTERN UNIV,MAT RES CTR,EVANSTON,IL 60208. NORTHWESTERN UNIV,SCI & TECHNOL CTR SUPERCOND,EVANSTON,IL 60208. NORTHWESTERN UNIV,DEPT CHEM,EVANSTON,IL 60208. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. WESTERN ILLINOIS UNIV,DEPT PHYS,MACOMB,IL 61455. NR 28 TC 3 Z9 3 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD OCT 10 PY 1992 VL 201 IS 1-2 BP 95 EP 102 DI 10.1016/0921-4534(92)90109-P PG 8 WC Physics, Applied SC Physics GA JT407 UT WOS:A1992JT40700014 ER PT J AU LINCE, JR DIDZIULIS, SV SHUH, DK DURBIN, TD YARMOFF, JA AF LINCE, JR DIDZIULIS, SV SHUH, DK DURBIN, TD YARMOFF, JA TI INTERACTION OF O2 WITH THE FE0.84CR0.16(001) SURFACE STUDIED BY PHOTOELECTRON-SPECTROSCOPY SO SURFACE SCIENCE LA English DT Article ID PHOTOIONIZATION CROSS-SECTIONS; STAINLESS-STEEL; OXIDE LAYERS; OXIDATION; IRON; CHROMIUM; METAL; OXYGEN; PHOTOEMISSION; BOMBARDMENT AB Soft X-ray photoelectron spectroscopy (SXPS; hv = 130-600 eV) employing synchrotron radiation and X-ray photoelectron spectroscopy (XPS; hv = 1486.6 eV) employing AlKalpha X-rays were used to study the effect of molecular oxygen adsorption (1 to 10(4) L) on the (001) surface of the steel-like alloy Fe0.84Cr0.16 at room temperature. The use of multiple photon energies allowed a qualitative determination of the distribution of species in the oxide film perpendicular to the surface. Prior to oxidation, Fe0.84Cr0.16 samples were annealed to different temperatures to produce varying concentrations of Cr in the top few monolayers of the (001) surface. The differences between the oxide films produced on these different surfaces were determined from SXPS primarily of the Fe3p, Cr3p, and valence levels. Small amounts of carbidic carbon (less-than-or-equal-to 1 ML) that had segregated to the (001) surface of the Fe0.84Cr0.16 alloy during initial sputter/anneal treatments were removed during the first approximately 5 L O2 exposure. In general, the resistance of the Fe0.84Cr0.16(001) surface to oxidation was directly related to the initial Cr concentration at the surface. The oxide films were richer in Cr compared to the bulk concentration for the lowest O2 exposures, and became increasingly enriched in Fe for increasing exposures, in agreement with studies by other groups. The resulting mixed Fe-Cr-O film contained Cr that was in the form of Cr3+ for all exposures. The Fe was in the form of Fe2+ and Fe3+, with an increasing Fe3+/Fe2+ ratio as the O2 exposure is increased. The results indicate that for O2 exposures < 10(4) L, the oxide films do not exhibit sharp boundaries between the Cr-rich and Fe-rich layers, in contrast to previously reported results for much larger (i.e., atmospheric) exposures. The observation of a mixed film, along with thermodynamic analysis, low-energy electron diffraction results, and comparison with other studies is consistent with an oxide film consisting of appreciable amounts of an amorphous, Fe1+xCr2-xO4-like species. The concentration of Fe1+xCr2-xO4 at the films' surfaces decreased in favor of Fe2O3 as the O2 exposure level increased. C1 UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP LINCE, JR (reprint author), AEROSP CORP,CTR MECH & MAT TECHNOL,2350 E EL SEGUNDO BLVD,EL SEGUNDO,CA 90245, USA. RI Lince, Jeffrey/N-1437-2013 OI Lince, Jeffrey/0000-0002-6545-6346 NR 47 TC 31 Z9 31 U1 0 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD OCT 10 PY 1992 VL 277 IS 1-2 BP 43 EP 63 DI 10.1016/0039-6028(92)90611-9 PG 21 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JR222 UT WOS:A1992JR22200011 ER PT J AU MULLINS, DR LYMAN, PF OVERBURY, SH AF MULLINS, DR LYMAN, PF OVERBURY, SH TI INTERACTION OF S WITH W(001) SO SURFACE SCIENCE LA English DT Article ID ENERGY ION-SCATTERING; ADSORPTION SITE; INDUCED RECONSTRUCTION; SURFACE PHOTOEMISSION; SULFUR OVERLAYERS; W(100) SURFACE; LEED ANALYSIS; 111 SURFACE; OXYGEN; TUNGSTEN AB Sulfur chemisorbed on W(001) has been studied by soft X-ray and ultraviolet photoelectron spectroscopy (UPS), Auger electron spectroscopy and work function measurements. Two distinct S 2p photoemission states have been identified as a function of sulfur coverage and sample annealing temperature. Below 0.5 ML, virtually all of the sulfur exists in a single state. Above 0.5 ML, a second state emerges at a lower binding energy. At 1 ML of sulfur, the two states have comparable intensity if the sample is annealed to 600 K. However, if the sample is annealed to 900 K nearly all of the sulfur resides in the low binding energy state. The high and low binding energy states have been associated with sulfur adsorbed in hollow and bridge sites, respectively. Possible reasons for the change in binding energy for sulfur adsorbed in the two different sites include an initial state (charge transfer) effect and a change in reference potential due to a change in height above the surface in the two types of adsorption site. The UPS, work function change and S(LMM) Auger lineshape results all indicate a change in S-W bonding at sulfur coverages above 0.5 ML. RP MULLINS, DR (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 57 TC 47 Z9 47 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD OCT 10 PY 1992 VL 277 IS 1-2 BP 64 EP 76 DI 10.1016/0039-6028(92)90612-A PG 13 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JR222 UT WOS:A1992JR22200012 ER PT J AU YOO, CS NELLIS, WJ AF YOO, CS NELLIS, WJ TI PHASE-TRANSITION FROM C-60 MOLECULES TO STRONGLY INTERACTING C-60 AGGLOMERATES AT HYDROSTATIC HIGH-PRESSURES SO CHEMICAL PHYSICS LETTERS LA English DT Article ID AMORPHOUS-CARBON; C60; RAMAN; SPECTRA; FILMS; C70 AB C60 molecules were studied at static pressures up to 30 GPa (300 kbar) at ambient temperature, using Raman and absorption spectroscopies. C60 molecules transform reversibly to a semi-transparent phase in the pressure range of 15-25 GPa with a large pressure hysteresis. The high-pressure phase consists of interconnected strongly interacting C60 agglomerates, or networks of fullerenes, whose stability continuously increases with increase of pressure. Above 27 GPa the transition becomes irreversible, and the material recovered from high pressure is metastable and diamond-like at ambient conditions. The Raman spectrum of the high-pressure phase indicates that it contains sp3-hybridized carbon atoms. These transitions are explained in terms of pi-electron rehybridization between C60 molecules, which occurs at substantially decreased intermolecular distances. C1 LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. RP YOO, CS (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,DIV H,LIVERMORE,CA 94550, USA. NR 22 TC 63 Z9 63 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD OCT 9 PY 1992 VL 198 IS 3-4 BP 379 EP 382 DI 10.1016/0009-2614(92)85068-L PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JR405 UT WOS:A1992JR40500023 ER PT J AU GOLD, LS SLONE, TH STERN, BR MANLEY, NB AMES, BN AF GOLD, LS SLONE, TH STERN, BR MANLEY, NB AMES, BN TI RODENT CARCINOGENS - SETTING PRIORITIES SO SCIENCE LA English DT Article ID POTENCY DATABASE; ANIMAL BIOASSAYS; CHRONOLOGICAL SUPPLEMENT; CHEMICAL CARCINOGENESIS; RISK ASSESSMENT; CAFFEIC ACID; TOTAL DIET; MICE; PESTICIDES; TUMORS AB The human diet contains an enormous background of natural chemicals, such as plant pesticides and the products of cooking, that have not been a focus of carcinogenicity testing. A broadened perspective that includes these natural chemicals is necessary. A comparison of possible hazards for 80 daily exposures to rodent carcinogens from a variety of sources is presented, using an index (HERP) that relates human exposure to carcinogenic potency in rodents. A similar ordering would be expected with the use of standard risk assessment methodology for the same human exposure values. Results indicate that, when viewed against the large background of naturally occurring carcinogens in typical portions of common foods, the residues of synthetic pesticides or environmental pollutants rank low. A similar result is obtained in a separate comparison of 32 average daily exposures to natural pesticides and synthetic pesticide residues in the diet. Although the findings do not indicate that these natural dietary carcinogens are important in human cancer, they cast doubt on the relative importance for human cancer of low-dose exposures to synthetic chemicals. C1 UNIV CALIF BERKELEY,DIV BIOCHEM & MOLEC BIOL,BERKELEY,CA 94720. RP GOLD, LS (reprint author), LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720, USA. FU NCI NIH HHS [CA39910]; NIEHS NIH HHS [ESO1896] NR 75 TC 120 Z9 121 U1 1 U2 7 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD OCT 9 PY 1992 VL 258 IS 5080 BP 261 EP 265 DI 10.1126/science.1411524 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JR860 UT WOS:A1992JR86000023 PM 1411524 ER PT J AU DASILVA, LB TREBES, JE BALHORN, R MROWKA, S ANDERSON, E ATTWOOD, DT BARBEE, TW BRASE, J CORZETT, M GRAY, J KOCH, JA LEE, C KERN, D LONDON, RA MACGOWAN, BJ MATTHEWS, DL STONE, G AF DASILVA, LB TREBES, JE BALHORN, R MROWKA, S ANDERSON, E ATTWOOD, DT BARBEE, TW BRASE, J CORZETT, M GRAY, J KOCH, JA LEE, C KERN, D LONDON, RA MACGOWAN, BJ MATTHEWS, DL STONE, G TI X-RAY LASER MICROSCOPY OF RAT SPERM NUCLEI SO SCIENCE LA English DT Article AB The development of high brightness and short pulse width (<200 picoseconds) x-ray lasers now offers biologists the possibility of high-resolution imaging of specimens in an aqueous environment without the blurring effects associated with natural motions and chemical erosion. As a step toward developing the capabilities of this type of x-ray microscopy, a tantalum x-ray laser at 44.83 angstrom wavelength was used together with an x-ray zone plate lens to image both unlabeled and selectively gold-labeled dried rat sperm nuclei. The observed images show approximately 500 angstrom features, illustrate the importance of x-ray microscopy in determining chemical composition, and provide information about the uniformity of sperm chromatin organization and the extent of sperm chromatin hydration. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. LAWRENCE BERKELEY LAB,CTR XRAY OPT,BERKELEY,CA 94720. UNIV CALIF SAN FRANCISCO,DIV MOLEC CYTOMETRY,SAN FRANCISCO,CA 94143. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. RP DASILVA, LB (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 17 TC 127 Z9 127 U1 1 U2 7 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD OCT 9 PY 1992 VL 258 IS 5080 BP 269 EP 271 DI 10.1126/science.1411525 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JR860 UT WOS:A1992JR86000025 PM 1411525 ER PT J AU MATHEWS, GJ AF MATHEWS, GJ TI THE EARLY OBSERVABLE UNIVERSE FROM DIFFUSE BACKGROUNDS - ROCCAVOLMERANGE,B, DEHARVENG,JM, TRANTHANHVAN,J SO SCIENCE LA English DT Book Review RP MATHEWS, GJ (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD OCT 9 PY 1992 VL 258 IS 5080 BP 335 EP 335 DI 10.1126/science.258.5080.335 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JR860 UT WOS:A1992JR86000044 PM 17835134 ER PT J AU EISEMAN, SE ETKIN, A FOLEY, KJ HACKENBURG, RW LONGACRE, RS LOVE, WA MORRIS, TW PLATNER, ED SAULYS, AC LINDENBAUM, SJ CHAN, CS KRAMER, MA HALLMAN, TJ MADANSKY, L AHMAD, S BONNER, BE BUCHANAN, JA CHIOU, CN CLEMENT, JM MUTCHLER, GS AF EISEMAN, SE ETKIN, A FOLEY, KJ HACKENBURG, RW LONGACRE, RS LOVE, WA MORRIS, TW PLATNER, ED SAULYS, AC LINDENBAUM, SJ CHAN, CS KRAMER, MA HALLMAN, TJ MADANSKY, L AHMAD, S BONNER, BE BUCHANAN, JA CHIOU, CN CLEMENT, JM MUTCHLER, GS TI RAPIDITY DISTRIBUTIONS AND NUCLEAR TRANSPARENCY IN HEAVY-ION COLLISIONS SO PHYSICS LETTERS B LA English DT Article ID SI+AU AB We have measured the rapidity distributions for charged particles produced in Si-Au collisions at 14.6 X A GeV/c. No evidence is seen for enhanced production of protons at high rapidity as recently postulated based on fits to earlier data. C1 CUNY CITY COLL,NEW YORK,NY 10031. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. RICE UNIV,HOUSTON,TX 77251. RP EISEMAN, SE (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 5 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 OCT 8 PY 1992 VL 292 IS 1-2 BP 10 EP 12 DI 10.1016/0370-2693(92)90600-9 PG 3 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JU127 UT WOS:A1992JU12700003 ER PT J AU LUTY, MA AF LUTY, MA TI VACUUM ALIGNMENT IN COMPOSITE TECHNICOLOR STANDARD MODELS SO PHYSICS LETTERS B LA English DT Article ID DYNAMICAL SYMMETRY BREAKING AB We consider the question of vacuum alignment in the recently proposed "composite technicolor standard models" (CTSMs). In these models, explicit chiral symmetry breaking due to masses of electroweak-singlet "ultrafermions" is communicated to the quarks and leptons by a chiral condensate produced by strong "ultracolor" gauge interactions. In these models the ultracolor vacuum alignment is determined by the competition between ultrafermion masses and "flavor" gauge boson "change. In order for these models to work, the gauge contribution to the effective potential is assumed to dominate the contribution from ultrafermion masses and stabilize the desired vacuum. Using spectral function sum rules and a vector-meson saturation approximation known to work well in QCD, we determine the gauge contribution to the effective potential for perturbative flavor gauge boson couplings in the limit where the number of ultracolors is large. We find that the flavor gauge interactions do not favor the vacuum required by CTSMs for weak couplings. While realistic models require nonperturbative values of the flavor gauge couplings, we interpret this as evidence against the vacuum required by CTSMs. RP LUTY, MA (reprint author), LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720, USA. NR 27 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD OCT 8 PY 1992 VL 292 IS 1-2 BP 113 EP 118 DI 10.1016/0370-2693(92)90617-D PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JU127 UT WOS:A1992JU12700020 ER PT J AU FALK, AF LUKE, M AF FALK, AF LUKE, M TI STRONG DECAYS OF EXCITED HEAVY MESONS IN CHIRAL PERTURBATION-THEORY SO PHYSICS LETTERS B LA English DT Article ID QUARK-MODEL AB We construct an effective lagrangian describing the interaction of soft pions and kaons with mesons containing a heavy quark and light degrees of freedom in an orbital p wave. The formalism is easily extended to heavy mesons and baryons in arbitrary excited states. We calculate the leading contributions to the strong decays D2* --> Dpi, D2* --> D*pi and D1 --> D*pi. We confirm the relations between the rates previously obtained by Isgur and Wise using heavy quark symmetry, and find that the absolute widths are consistent with naive power counting. We also estimate the branching ratios for the two pion decays D2* --> D*pipi, D1 --> D*pipi and D1-->Dpipi, which are dominated by pole graphs. Our predictions depend on the masses and widths of the as yet unseen scalar-pseudovector p-wave doublet. Heavy quark spin symmetry predicts GAMMA(D2* --> D*pipi):GAMMA(D1 --> D*pipi):GAMMA(D1 --> Dpipi) = 3:1:2, but this relation is badly violated in practice because 1/M effects arising purely from kinematics are large. C1 UNIV CALIF SAN DIEGO,DEPT PHYS 0319,LA JOLLA,CA 92093. RP FALK, AF (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 18 TC 149 Z9 150 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 OCT 8 PY 1992 VL 292 IS 1-2 BP 119 EP 127 DI 10.1016/0370-2693(92)90618-E PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JU127 UT WOS:A1992JU12700021 ER PT J AU BAGGER, J DAWSON, S VALENCIA, G AF BAGGER, J DAWSON, S VALENCIA, G TI VECTOR-BOSON VERSUS GLUON FUSION AT HADRON COLLIDERS SO PHYSICS LETTERS B LA English DT Article ID CHIRAL PERTURBATION-THEORY; STRONGLY INTERACTING WS; SYMMETRY-BREAKING; STANDARD MODEL; WW SCATTERING; HIGGS BOSON; TECHNICOLOR; SECTOR; GAMMA-GAMMA->PI-0-PI-0; LAGRANGIANS AB We use chiral perturbation theory to show that pseudo-Goldstone boson scattering and gluon fusion probe different aspects of electroweak symmetry breaking at hadron colliders. In particular, different physics may be responsible for unitarizing the lowest-order pseudo-Goldstone boson scattering amplitudes and the gluon fusion process. We first show this within the context of strict chiral perturbation theory, and then discuss it using the language of resonances. C1 FERMI NATL ACCELERATOR LAB,THEORY GRP,BATAVIA,IL 60510. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP BAGGER, J (reprint author), JOHNS HOPKINS UNIV,DEPT PHYS & ASTRON,BALTIMORE,MD 21218, USA. NR 33 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 OCT 8 PY 1992 VL 292 IS 1-2 BP 137 EP 142 DI 10.1016/0370-2693(92)90620-J PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JU127 UT WOS:A1992JU12700023 ER PT J AU WALLACE, DC AF WALLACE, DC TI COMPRESSION DEPENDENCE OF THE MELTING OF ELEMENTS SO PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES LA English DT Article ID HIGH-PRESSURE; ENTROPY; METALS; LIQUID; POTASSIUM; LITHIUM; SODIUM; CESIUM AB In normal melting there is no significant change in the electronic structure, while in anomalous melting the crystal and liquid have different electronic structures. For those elements that melt.normally at zero pressure, the pressure derivative of the melting temperature is shown to follow the normal melting rule. For Ar, Na, K and Hg, the normal melting properties continue to hold to high compression, and in Hg it appears that the strong higher-order correlations in the liquid are gradually weakened by compression. The normal melting process is described by two sets of nearly independent parameters: universal statistical factors. and factors depending on the interatomic forces. Anomalous melting is related to a compression induced solid-solid-liquid triple point, and Cs is observed to change from normal to anomalous as its first triple point is approached. RP WALLACE, DC (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 34 TC 10 Z9 11 U1 0 U2 2 PU ROYAL SOC LONDON PI LONDON PA 6 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5AG SN 1364-5021 J9 P ROY SOC LOND A MAT JI Proc. R. Soc. London Ser. A-Math. Phys. Eng. Sci. PD OCT 8 PY 1992 VL 439 IS 1905 BP 177 EP 187 DI 10.1098/rspa.1992.0142 PG 11 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JU325 UT WOS:A1992JU32500013 ER PT J AU FAUST, R GLENDENING, ED STREITWIESER, A VOLLHARDT, KPC AF FAUST, R GLENDENING, ED STREITWIESER, A VOLLHARDT, KPC TI ABINITIO STUDY OF SIGMA-EFFECTS AND PI-EFFECTS IN BENZENES FUSED TO 4-MEMBERED RINGS - REHYBRIDIZATION, DELOCALIZATION, AND ANTIAROMATICITY SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID BOND LOCALIZATION; CYCLOHEXATRIENE RING; ANNELATED AROMATICS; MOLECULES; HYDROCARBONS; SPECTRA; STRAIN; TRICYCLOBUTABENZENE; PHOTOELECTRON; DERIVATIVES AB The geometries of benzene incrementally fused to cyclobutenes, 3,4-dimethylenecyclobutenes, and cyclobutadienes are investigated with ab initio SCF-MO methods and by natural bond orbital (NBO)/natural resonance theory (NRT) analysis. These systems show various degrees of bond alternation in the six-membered ring with fused bonds elongated and bonds adjacent to the site of annelation contracted compared to those of benzene. NBO analysis reveals significant strain in the sigma-frame as evidenced by strong rehybridization at the annelated carbon centers. This effect accounts, in part, for the bond alternation in the cyclobutadieno-fused benzenes, but has negligible influence on that of the cyclobuteno- and 3,4-dimethylenecyclobuteno-fused analogs. The relative contributions of the two Kekule resonance forms are assessed by NRT analysis and are found to be in accord with the postulate originally presented by Mills and Nixon. Our results suggest that the principal source of bond alternation is either hyperconjugation (in cyclobuteno-fused benzenes) or conjugation (in benzenes annelated to 3,4-dimethylenecyclobutene or cyclobutadiene). In all cases, deletion of these delocalizing interactions from the wave function leads to a more symmetrical benzene geometry. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RI Faust, Rudiger/K-4891-2014 OI Faust, Rudiger/0000-0002-9231-591X NR 87 TC 89 Z9 89 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 OCT 7 PY 1992 VL 114 IS 21 BP 8263 EP 8268 DI 10.1021/ja00047a042 PG 6 WC Chemistry, Multidisciplinary SC Chemistry GA JR863 UT WOS:A1992JR86300042 ER PT J AU FERRIS, KF BARTLETT, RJ AF FERRIS, KF BARTLETT, RJ TI HYDROGEN PENTAZOLE - DOES IT EXIST SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID OPEN-CHAIN MOLECULE; N6 C1 UNIV FLORIDA, QUANTUM THEORY PROJECT, GAINESVILLE, FL 32611 USA. PACIFIC NW LAB, DEPT MAT SCI, RICHLAND, WA 99352 USA. RI Bartlett, Rodney/F-6781-2011 OI Bartlett, Rodney/0000-0003-3865-9639 NR 25 TC 65 Z9 65 U1 1 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD OCT 7 PY 1992 VL 114 IS 21 BP 8302 EP 8303 DI 10.1021/ja00047a058 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA JR863 UT WOS:A1992JR86300058 ER PT J AU DABHOLKAR, M BOSTICKBRUTON, F WEBER, C BOHR, VA EGWUAGU, C REED, E AF DABHOLKAR, M BOSTICKBRUTON, F WEBER, C BOHR, VA EGWUAGU, C REED, E TI ERCC1 AND ERCC2 EXPRESSION IN MALIGNANT-TISSUES FROM OVARIAN-CANCER PATIENTS SO JOURNAL OF THE NATIONAL CANCER INSTITUTE LA English DT Article ID EXCISION REPAIR GENE; HOST-CELL REACTIVATION; DNA-REPAIR; MOLECULAR-CLONING; BIOLOGICAL CHARACTERIZATION; CISPLATIN RESISTANCE; DAMAGED PLASMID; CDNA CLONING; LINE; CIS-DIAMMINEDICHLOROPLATINUM(II) AB Background: ERCC1 and ERCC2 are human DNA repair genes that are associated with in vitro resistance to selected DNA-damaging agents. Purpose: Fresh tumor tissues from 26 patients with ovarian cancer were analyzed for the RNA levels of expression of these genes to determine possible clinical relevance. Methods: Tumor tissues were harvested from patients immediately before they entered a cisplatin- or carboplatin-based treatment protocol. Clinical response was assessed by standard criteria. Gene expression level was assessed by slot blot analysis, using beta-actin as a control. Relative expression levels were determined by comparing each tumor sample with a Chinese hamster ovary cell line that had a stable transfection of the human ERCC1 gene. Results: Patients who were clinically resistant to platinum-based therapy had a 2.6-fold higher expression level of ERCC1 in their tumor tissue than did patients who responded to that therapy (P = .015). Results obtained by slot blot analysis were qualitatively confirmed by polymerase chain reaction analysis. Relative levels of expression of ERCC2 did not differ significantly between responders and nonresponders. Conclusion: We conclude that ERCC1 expression levels in hu. man tumor tissue may have a role in clinical resistance to platinum compounds. These data appear to be consistent with the assertion that ERCC1 serves as an excision nuclease, whereas ERCC2 serves as a helicase. C1 NCI,DIV CANC TREATMENT,MED BRANCH,CLIN ONCOL PROGRAM,BLDG 10,RM 12N226,BETHESDA,MD 20892. NCI,DIV CANC TREATMENT,MOLEC PHARMACOL LAB,DEV THERAPEUT PROGRAM,BETHESDA,MD 20892. LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. NEI,IMMUNOL LAB,BETHESDA,MD 20892. NR 26 TC 250 Z9 258 U1 0 U2 4 PU NATL CANCER INSTITUTE PI BETHESDA PA 9030 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0027-8874 J9 J NATL CANCER I JI J. Natl. Cancer Inst. PD OCT 7 PY 1992 VL 84 IS 19 BP 1512 EP 1517 DI 10.1093/jnci/84.19.1512 PG 6 WC Oncology SC Oncology GA JQ627 UT WOS:A1992JQ62700019 PM 1433335 ER PT J AU GOLDBECK, RA EINARSDOTTIR, O DAWES, TD OCONNOR, DB SURERUS, KK FEE, JA KLIGER, DS AF GOLDBECK, RA EINARSDOTTIR, O DAWES, TD OCONNOR, DB SURERUS, KK FEE, JA KLIGER, DS TI MAGNETIC CIRCULAR-DICHROISM STUDY OF CYTOCHROME-BA3 FROM THERMUS-THERMOPHILUS - SPECTRAL CONTRIBUTIONS FROM CYTOCHROME-B AND CYTOCHROME-A3 AND NANOSECOND SPECTROSCOPY OF CO PHOTODISSOCIATION INTERMEDIATES SO BIOCHEMISTRY LA English DT Article ID PI-ELECTRON SYSTEMS; INFRARED-SPECTROSCOPY; RESPIRATORY PROTEINS; ALGEBRAIC-SOLUTION; ESCHERICHIA-COLI; PERIMETER MODEL; SIGN VARIATION; OXIDASE; HEME; BINDING AB Near-UV-vis magnetic and natural circular dichroism (MCD and CD) spectra of oxidized, reduced, and carbonmonoxy-complexed cytochrome ba3, a terminal oxidase from the bacterium Thermus thermophilus, and nanosecond time-resolved MCD (TRMCD) and CD (TRCD) spectra of the unligated species formed after photodissociation of the CO complex are presented. The spectral contributions of individual cytochromes b and a3 to the Soret region MCD are identified. TRMCD spectroscopy is used to follow the spin state change (S = 0 to S = 2) in cytochrome a3(2+) following photodissociation of the CO complex. There is prompt appearance of the high-spin state after photolysis, as found previously in mammalian cytochrome oxidase [Goldbeck, R. A., Dawes, T. D., Einarsdottir, O., Woodruff, W. H., & Kliger, D. S. (1991)Biophys. J. 60,125-134]. Peak shifts of 1-10 nm appear in the TRMCD, TRCD, and time-resolved UV-vis absorption spectra of the photolyzed enzyme throughout its observable lifetime, indicating that the photolyzed enzyme does not relax to its equilibrium deliganded form before recombination with CO occurs hundreds of milliseconds later. Direct heme-heme interaction is not found in cytochrome ba3, but red-shifts in the MCD and absorption spectra of both cytochromes b and (photolyzed) a3 are correlated with a CO-liganded form of the protein. The long time (tau greater than or similar to 1 s) needed for relaxation of the cytochrome b and a3 peaks to their static positions suggests that CO binding to a3 induces a global conformational change in the protein that weakly perturbs the MCD and absorption spectra of b and photolyzed a3. Fe(a3) binds CO more weakly in cytochrome ba3 than in cytochrome aa3. The MCD spectrum of reduced enzyme solution placed under 1 atm of CO contains a peak at 446 nm that shows approximately 30% of total cytochrome a3 remains pentacoordinate, high-spin. C1 LOS ALAMOS NATL LAB,DIV ISOTOPE & NUCL CHEM,LOS ALAMOS,NM 87545. RP GOLDBECK, RA (reprint author), UNIV CALIF SANTA CRUZ,DEPT CHEM & BIOCHEM,SANTA CRUZ,CA 95064, USA. FU NIGMS NIH HHS [GM-38549, GM-35342] NR 56 TC 36 Z9 36 U1 0 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 OCT 6 PY 1992 VL 31 IS 39 BP 9376 EP 9387 DI 10.1021/bi00154a008 PG 12 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JR320 UT WOS:A1992JR32000008 PM 1327113 ER PT J AU FU, WS OLBRIGHT, GR KLEM, JF HARRIS, JS AF FU, WS OLBRIGHT, GR KLEM, JF HARRIS, JS TI OPTICAL GAIN AND ULTRAFAST NONLINEAR RESPONSE IN GAAS/ALAS TYPE-II QUANTUM-WELLS SO APPLIED PHYSICS LETTERS LA English DT Article ID GAAS-ALAS SUPERLATTICES; ELECTRIC-FIELD AB We describe the femtosecond optical gain nonlinearities for the unusual case of electrons which are distributed between the direct-GaAs and indirect-AlAs layers in a GaAs/AlAs type-II multiple quantum-well (MQW) structure. Due to the spatial separation of electrons from the holes, we observe a significant increase in the gain lifetime ( > 150 ps) in type-II MQWs, as compared to type-I MQWs (approximately 50 ps). In addition, we investigate the effect of a longitudinal electric field GAMMA-X energy splitting in type-II structures. Finally, at early times we observe an ultrafast nonlinear optical response in the gain/absorption spectra which we attributed to electron-hole scattering without carrier loss. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. STANFORD UNIV,DEPT ELECT ENGN,SOLID STATE ELECTR LAB,STANFORD,CA 94305. RP FU, WS (reprint author), PHOTON RES INC,350 INTERLOCKEN PKWY,BROOMFIELD,CO 80021, USA. NR 12 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 OCT 5 PY 1992 VL 61 IS 14 BP 1661 EP 1663 DI 10.1063/1.108443 PG 3 WC Physics, Applied SC Physics GA JQ652 UT WOS:A1992JQ65200018 ER PT J AU COLE, BF LIANG, GC NEWMAN, N CHAR, K ZAHARCHUK, G AF COLE, BF LIANG, GC NEWMAN, N CHAR, K ZAHARCHUK, G TI LARGE-AREA YBA2CU3O7-DELTA THIN-FILMS ON SAPPHIRE FOR MICROWAVE APPLICATIONS SO APPLIED PHYSICS LETTERS LA English DT Article ID SUPERCONDUCTING FILMS; SURFACE-RESISTANCE; BUFFER LAYERS AB We have deposited YBa2Cu3O7-delta(YBCO) films with low microwave surface resistance (R(s)) on 5-cm-diam, oxide-buffered sapphire substrates by planar magnetron sputtering. MgO buffer layers are used on M-plane (1010BAR) sapphire, and R-plane (1102BAR) sapphire is buffered by CeO2. R(s) values of 450-620 muOMEGA at 77 K and 10 GHz were measured across an entire 5-cm diam YBCO film on M-plane sapphire. For YBCO on R-plane sapphire, R(s) values at 77 K and 10 GHz were 950 muOMEGA for a 5-cm-diam wafer and 700 muOMEGA for 1 X 1 CM2 samples. C1 SANDIA NATL LABS,DEPT 1154,ALBUQUERQUE,NM 87185. RP COLE, BF (reprint author), CONDUCTUS INC,969 W MAUDE AVE,SUNNYVALE,CA 94086, USA. RI Newman, Nathan/E-1466-2011 OI Newman, Nathan/0000-0003-2819-9616 NR 12 TC 96 Z9 97 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 OCT 5 PY 1992 VL 61 IS 14 BP 1727 EP 1729 DI 10.1063/1.108411 PG 3 WC Physics, Applied SC Physics GA JQ652 UT WOS:A1992JQ65200040 ER PT J AU LEE, TC UEMURA, Y SNYDER, F AF LEE, TC UEMURA, Y SNYDER, F TI A NOVEL COA-INDEPENDENT TRANSACETYLASE PRODUCES THE ETHANOLAMINE PLASMALOGEN AND ACYL ANALOGS OF PLATELET-ACTIVATING-FACTOR (PAF) WITH PAF AS THE ACETATE DONOR IN HL-60 CELLS SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID HUMAN POLYMORPHONUCLEAR LEUKOCYTES; VASCULAR ENDOTHELIAL-CELLS; HUMAN NEUTROPHILS; LIPID EXTRACT; BOVINE BRAIN; RAT SPLEEN; ACETYLTRANSFERASE; BIOSYNTHESIS; MICROSOMES; 1-ALKYL-2-ACETYL-SN-GLYCERO-3-PHOSPHOCHOLINE AB In this study, we demonstrate the presence of unique membrane-associated transacetylase that transfers the acetate group from platelet-activating factor (PAF) to lysoplasmalogen (in the presence of EDTA and sodium acetate) with the formation of 1-alk-1-enyl-2-acetyl-sn-glycero-3-phosphoethanolamine (alk-1-enylacetyl-GPE). The identity of alk-1-enylacetyl-GPE was confirmed by acid hydrolysis, phospholipases A2 or C treatment and derivatization by fluorodinitrobenzene. The transacetylase has no requirement for Ca2+, Mg2+, or CoA and a broad pH optimum (7.0-8.0) with K(m) values of 12.0 muM for PAF and 106.4 muM for lysoplasmalogens. The enzyme activity from the isolated membrane fraction is not change when whole cells are supplemented with 20:4, induce to differentiate into granulocytes, or treated with ionophore A23187. Radyllyso-sn-glycero-3-phosphocholine (GPC), radyllyso-GPE, acyllyso-sn-glycero-3-phosphoserine (GPS), acyllyso-sn-glycero-3-phosphoinositol (GPI), alkyllyso-sn-glycero-3-phosphate (GP), acyllyso-GP, or cis-9-octadecen-1-ol can also serve as acetate acceptors, whereas alkylglycerol, acylglycerol, or cholesterol are inactive. Differences in substrate acceptor specificity, sensitivity toward phenylmethylsulfonyl fluoride, and response to temperature suggest that the CoA-independent transacetylase and the CoA-independent transacylase that transfers long-chain acyl moieties are two separate enzymes. With intact differentiated HL-60 cells, [H-3]acetate from [H-3]PAF can be incorporated into alk-1-enylacetyl-GPE in the presence of ionophore A23187, but not in its absence. Moreover, phospholipase A2 inhibitors (p-bromophenacyl bromide and mepacrine) block the transacetylation process in whole cell system. These results indicate the production of alk-1-enyllyso-GPE is a rate-limiting factor for the subsequent transacetylation step during cell activation. We conclude that the transacetylase may participate in the biosynthesis of ethanolamine plasmalogen and acyl analogs of PAF, in vivo, fine-tuning of PAF biological responses, and cross-talk between de novo and remodeling pathways of PAF biosynthesis. RP LEE, TC (reprint author), OAK RIDGE ASSOCIATED UNIV,DIV MED SCI,OAK RIDGE,TN 37831, USA. FU NHLBI NIH HHS [HL27109-11A1, HL35495-05A1] NR 42 TC 35 Z9 37 U1 0 U2 0 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD OCT 5 PY 1992 VL 267 IS 28 BP 19992 EP 20001 PG 10 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JR858 UT WOS:A1992JR85800041 PM 1400315 ER PT J AU THEINE, K BYRNE, AP HUBEL, H MURZEL, M CHAPMAN, R CLARKE, D KHAZAIE, F LISLE, JC MO, JN GARRETT, JD RYDE, H WYSS, R AF THEINE, K BYRNE, AP HUBEL, H MURZEL, M CHAPMAN, R CLARKE, D KHAZAIE, F LISLE, JC MO, JN GARRETT, JD RYDE, H WYSS, R TI HIGH-SPIN STRUCTURE OF W-167 AND W-168 SO NUCLEAR PHYSICS A LA English DT Article DE ND-142(SI-30, XN); E = 165 MEV; MEASURED-GAMMA-GAMMA; GAMMA-GAMMA-GAMMA-COIN; GAMMA-GAMMA(THETA); SYSTEMATICS OF N = 93; 94 ISOTONES; Z = 74 ISOTOPES; W-167, W-168 DEDUCED LEVELS; J; ALIGNED ANGULAR MOMENTUM; CRANKED SHELL MODEL; ENRICHED TARGETS; ARRAY OF COMPTON-SUPPRESSED GE DETECTORS ID RARE-EARTH NUCLEI; BAND-CROSSING FREQUENCIES; RAPIDLY ROTATING NUCLEI; ELECTROMAGNETIC PROPERTIES; SPECTROSCOPY; SYSTEMATICS; NEUTRON; STATES; MODEL; ALIGNMENT AB Excited states in 167W and 168W, populated in the Nd-142(Si-30, xn) reaction, were investigated at high spins using the ESSA30 array with 29 Compton-suppressed Ge detectors. The level schemes are extended to higher spins and several new rotational bands are identified. The results are discussed in comparison with existing data on the neighbouring N = 93 and 94 isotones and on the Z = 74 W isotopes. A theoretical analysis is presented within the framework of a pairing-self-consistent cranked shell model using shape parameters obtained from total-routhian-surface calculations. C1 UNIV BONN,INST STRAHLEN & KERNPHYS,NUSSALLEE 14-16,W-5300 BONN,GERMANY. UNIV MANCHESTER,SCHUSTER LAB,MANCHESTER M13 9PL,LANCS,ENGLAND. UNIV COPENHAGEN,NIELS BOHR INST,DK-2100 COPENHAGEN,DENMARK. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. UNIV LUND,DEPT PHYS,S-22362 LUND,SWEDEN. MANNE SIEGBAHN INST PHYS,S-10405 STOCKHOLM,SWEDEN. OI Byrne, Aidan/0000-0002-7096-6455 NR 50 TC 28 Z9 30 U1 4 U2 16 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD OCT 5 PY 1992 VL 548 IS 1 BP 71 EP 101 DI 10.1016/0375-9474(92)90078-X PG 31 WC Physics, Nuclear SC Physics GA JV308 UT WOS:A1992JV30800006 ER PT J AU HAN, T MENG, R OHNEMUS, J AF HAN, T MENG, R OHNEMUS, J TI TRANSVERSE-MOMENTUM DISTRIBUTION OF Z-BOSON PAIRS AT HADRON SUPERCOLLIDERS SO NUCLEAR PHYSICS B LA English DT Article ID SUPERCONDUCTING SUPER COLLIDER; TO-BACK JETS; HIGGS-BOSON; LEADING ORDER; GLUON FUSION; QCD; SCATTERING; PHYSICS; W+/ AB We present the transverse-momentum distribution of the Z-pairs for pp --> ZZX at supercollider energies. The full p(T)(ZZ) spectrum is obtained by matching the low-p(T) result (from soft gluon resummation to all orders in alpha(s)) to the high-p(T) result (from the O(alpha(s)) perturbative calculation). We examine where the fixed O(alpha(s)) perturbative calculation is unreliable. We also present a comparison of our result with the Monte Carlo program PYTHIA. The results are significant for background calculations to heavy Higgs boson searches at hadron supercolliders, as well as for testing perturbative QCD. C1 UNIV DURHAM,DEPT PHYS,DURHAM DH1 3LE,ENGLAND. ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439. RP HAN, T (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. OI Meng, Ruibin/0000-0002-4846-4619 NR 47 TC 14 Z9 14 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD OCT 5 PY 1992 VL 384 IS 1-2 BP 59 EP 77 DI 10.1016/0550-3213(92)90461-J PG 19 WC Physics, Particles & Fields SC Physics GA JV774 UT WOS:A1992JV77400002 ER PT J AU CHANG, D KEPHART, TW KEUNG, WY YUAN, TC AF CHANG, D KEPHART, TW KEUNG, WY YUAN, TC TI AN EFFECTIVE FIELD-THEORY FOR THE NEUTRON ELECTRIC-DIPOLE MOMENT SO NUCLEAR PHYSICS B LA English DT Article ID HIGGS-BOSON-EXCHANGE; CP-VIOLATION; DERIVATIVE EXPANSION; STANDARD MODEL; CONSTRAINTS; DIMENSION; OPERATORS; SCALAR; TERMS; QUARK AB We derive a CP-odd effective field theory involving the field strengths of the gluon and the photon and their duals as a result of integrating out a heavy quark which carries both the chromo-electric dipole moment and electric dipole moment. The coefficients of the induced gluonic, photonic, and mixed gluon-photon operators with dimension less-than-or-equal-to 8 are determined. Implications of some of these operators on the neutron electric dipole moment are also discussed. C1 UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60680. VANDERBILT UNIV,DEPT PHYS & ASTRON,NASHVILLE,TN 37235. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP CHANG, D (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. NR 38 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD OCT 5 PY 1992 VL 384 IS 1-2 BP 147 EP 167 DI 10.1016/0550-3213(92)90465-N PG 21 WC Physics, Particles & Fields SC Physics GA JV774 UT WOS:A1992JV77400006 ER PT J AU KOSOWSKY, A TURNER, MS WATKINS, R AF KOSOWSKY, A TURNER, MS WATKINS, R TI GRAVITATIONAL-WAVES FROM 1ST-ORDER COSMOLOGICAL PHASE-TRANSITIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID FALSE VACUUM; RADIATION; FATE AB A first-order cosmological phase transition that proceeds through the nucleation and collision of true-vacuum bubbles is a potent source of gravitational radiation. Possibilities for such include first-order inflation, grand-unified-theory-symmetry breaking, and electroweak-symmetry breaking. We have calculated gravity-wave production from the collision of two scalar-field vacuum bubbles, and, using an approximation based upon these results, from the collision of 20 to 30 vacuum bubbles. We present estimates of the relic background of gravitational waves produced by a first-order phase transition; in general, OMEGA(GW) is similar to 10(-9) and f is similar to (10(-6) Hz)(T/1 GeV). C1 UNIV CHICAGO,ENRICO FERMI INST,DEPT PHYS,CHICAGO,IL 60637. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. RP KOSOWSKY, A (reprint author), NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 18 TC 107 Z9 107 U1 2 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 5 PY 1992 VL 69 IS 14 BP 2026 EP 2029 DI 10.1103/PhysRevLett.69.2026 PG 4 WC Physics, Multidisciplinary SC Physics GA JQ622 UT WOS:A1992JQ62200002 ER PT J AU CHANOWITZ, MS AF CHANOWITZ, MS TI PROBING ULTRAHEAVY QUANTA WITH PHOTON-PHOTON OR GLUON-GLUON SCATTERING SO PHYSICAL REVIEW LETTERS LA English DT Article ID GAMMA-GAMMA-BEAMS; PASS E+E ACCELERATORS; WEAK INTERACTIONS; BOSON PRODUCTION; COLLIDING BEAMS; GAUGE THEORIES; ANOMALIES; HELICITY; TRACE; MASS AB The existence of ultraheavy quanta too heavy to produce directly may be probed by means of the rising cross sections they would induce in scattering at the TeV energy scale of photon or gluon pairs to weak boson pairs, for instance gammagamma --> ZZ or gg --> ZZ. RP CHANOWITZ, MS (reprint author), LAWRENCE BERKELEY LAB,DIV PHYS,THEORET PHYS GRP,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 40 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 5 PY 1992 VL 69 IS 14 BP 2037 EP 2041 DI 10.1103/PhysRevLett.69.2037 PG 5 WC Physics, Multidisciplinary SC Physics GA JQ622 UT WOS:A1992JQ62200005 ER PT J AU ORR, NA ANANTARAMAN, N AUSTIN, SM BERTULANI, CA HANOLD, K KELLEY, JH MORRISSEY, DJ SHERRILL, BM SOULIOTIS, GA THOENNESSEN, M WINFIELD, JS WINGER, JA AF ORR, NA ANANTARAMAN, N AUSTIN, SM BERTULANI, CA HANOLD, K KELLEY, JH MORRISSEY, DJ SHERRILL, BM SOULIOTIS, GA THOENNESSEN, M WINFIELD, JS WINGER, JA TI MOMENTUM DISTRIBUTIONS OF LI-9 FRAGMENTS FOLLOWING THE BREAKUP OF LI-11 SO PHYSICAL REVIEW LETTERS LA English DT Article ID NEUTRON-RICH NUCLEI; PROJECTILE FRAGMENTATION; CROSS-SECTIONS; HALO; MODEL; O-16 AB Using a fragment separator as an energy-loss spectrometer the parallel momentum distributions of Li-9 nuclei produced in the breakup of Li-11 at 66 MeV/nucleon have been measured. Distributions with Gaussian widths of sigma(parallel-to) almost-equal-to 19 MeV/c were observed for Be-9, Nb-93, and Ta-181 targets-the first time such a narrow structure has been observed for high mass targets. From the weak dependence of width on breakup target it appears that the parallel momentum distributions are relatively insensitive to the interaction governing the breakup and reflect an extended neutron distribution for Li-11. C1 MICHIGAN STATE UNIV,DEPT PHYS & ASTRON,E LANSING,MI 48824. MICHIGAN STATE UNIV,DEPT CHEM,E LANSING,MI 48824. LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP ORR, NA (reprint author), MICHIGAN STATE UNIV,NATL SUPERCONDUCTING CYCLOTRON LAB,E LANSING,MI 48824, USA. RI Sherrill, Bradley/B-4098-2009; Sherrill, Bradley/B-3378-2011 NR 25 TC 124 Z9 127 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 5 PY 1992 VL 69 IS 14 BP 2050 EP 2053 DI 10.1103/PhysRevLett.69.2050 PG 4 WC Physics, Multidisciplinary SC Physics GA JQ622 UT WOS:A1992JQ62200008 ER PT J AU WELP, U GRIMSDITCH, M FLESHLER, S NESSLER, W DOWNEY, J CRABTREE, GW GUIMPEL, J AF WELP, U GRIMSDITCH, M FLESHLER, S NESSLER, W DOWNEY, J CRABTREE, GW GUIMPEL, J TI EFFECT OF UNIAXIAL-STRESS ON THE SUPERCONDUCTING TRANSITION IN YBA2CU3O7 SO PHYSICAL REVIEW LETTERS LA English DT Article ID UNTWINNED YBA2CU3O7-DELTA; OXYGEN; TC; PRESSURE; TEMPERATURE; LA2-XSRXCUO4; DEPENDENCE; ANOMALIES; STATE AB We present the first direct measurements of T(c) as a function of uniaxial stress p(i) (i = a,b,c) along the crystal axes for an untwinned YBa2Cu3O7-delta single crystal. T(c) is linear in pi with slopes dT(c)/dp(a) = -2.0 +/- 0.2 K/GPa, dT(c)/dp(b) = +1.9 +/- 0.2 K/GPa, and dT(c)/dp(c) = -0.3 +/- 0.1 K/GPa. These results confirm predictions based on thermal expansion measurements [C. Meingast et al., Phys. Rev. Lett. 67, 1634 (1991)] and show that the small hydrostatic pressure dependence of T(c) in YBa2Cu3O7-delta is due to a cancellation of large and opposite effects in the a-b plane. C1 ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439. UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. RP WELP, U (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. OI Guimpel, Julio/0000-0002-7528-7777 NR 39 TC 161 Z9 162 U1 1 U2 9 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 5 PY 1992 VL 69 IS 14 BP 2130 EP 2133 DI 10.1103/PhysRevLett.69.2130 PG 4 WC Physics, Multidisciplinary SC Physics GA JQ622 UT WOS:A1992JQ62200028 ER PT J AU LIN, Y LIU, AD TRIFUNAC, AD KRONGAUZ, VV AF LIN, Y LIU, AD TRIFUNAC, AD KRONGAUZ, VV TI INVESTIGATION OF ELECTRON-TRANSFER BETWEEN HEXAARYLBIIMIDAZOLE AND VISIBLE SENSITIZER SO CHEMICAL PHYSICS LETTERS LA English DT Article ID RANDOMLY DISTRIBUTED ACCEPTORS; DIRECT ENERGY-TRANSFER; DIFFUSION; EXCHANGE AB Photoinduced electron transfer between the hexaarylbiimidazole (HABI) and visible sensitizer, 2,5-bis [(2,3,6,7-tetrahydro-1H, 5H-benzo[i,j]quinolizin-1-yl)methylene]cyclopentanone (JAW), in liquid solution was investigated experimentally. The relative fluorescence quantum yield of the sensitizer molecule was measured as a function of HABI concentration. An exponential dependence on HABI concentration was observed for the sensitizer fluorescence yield, from which the critical distance for the electron transfer interaction was determined to be approximately 12 angstrom. The time-dependent fluorescence quenching was studied with the time-correlated single-photon counting technique. The dynamics of the electron transfer process was determined by comparing the experimental data to existing models of electron transfer in liquids. The inclusion of the relative diffusion between the electron donor and acceptor molecules is necessary to fit all the observations and to obtain accurate transfer parameters. C1 DUPONT CO, EXPTL STN LAB, IMAGING SYST, WILMINGTON, DE 19880 USA. RP LIN, Y (reprint author), ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. NR 27 TC 22 Z9 23 U1 0 U2 3 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 OCT 2 PY 1992 VL 198 IS 1-2 BP 200 EP 206 DI 10.1016/0009-2614(92)90072-U PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JQ116 UT WOS:A1992JQ11600034 ER PT J AU BECK, ST APPELHANS, AD DELMORE, JE DAHL, DA AF BECK, ST APPELHANS, AD DELMORE, JE DAHL, DA TI INVESTIGATION OF SURFACE CHARGING OF INSULATING MATERIALS DUE TO SECONDARY PARTICLE-EMISSION USING A NEW DUAL BEAM INSTRUMENT SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES LA English DT Article DE PARTICLE EMISSION; SIMS; INSULATOR CHARGING; ION OPTICS; CHARGE MEASUREMENT ID ION MASS-SPECTROMETRY; SIMS; SF6 AB A new instrument has been developed to study the characteristics of charge build-up on insulating materials caused by the sputtering of secondary particles by ion, electron, neutral or photon beams. The instrument utilizes two beam lines: the charging ion beam irradiates the sample while a measurement ion beam is passed parallel to the sample surface and is then deflected by the charge on the sample. The deflection of the measurement beam, which is proportional to the charge on the sample, is measured with a microchannel plate and photodiode array combination. For these experiments the instrument was configured to simulate a secondary ion mass spectrometer using a negative ion primary beam and a secondary ion extraction lens element. The charge build-up on Mylar and Teflon bulk films was measured as a function of extraction voltage and the results were analyzed using the SIMION ion optics code. The samples could be charged negative or positive, depending upon extraction voltage, and the dominant parameter controlling the charging was the shape of the potential field near the sample. The results indicate that the extraction voltage and the design of the sample mount and near-field regions are the important factors controlling sample charging. C1 EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415. NR 19 TC 4 Z9 4 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1176 J9 INT J MASS SPECTROM JI Int. J. Mass Spectrom. Ion Process. PD OCT 2 PY 1992 VL 120 IS 1-2 BP 129 EP 155 DI 10.1016/0168-1176(92)80057-8 PG 27 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA JT801 UT WOS:A1992JT80100008 ER PT J AU DEVOLPI, A RHODES, EA AF DEVOLPI, A RHODES, EA TI DETECTING EXPLOSIVES SO SCIENCE LA English DT Letter RP DEVOLPI, A (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 1 TC 1 Z9 1 U1 0 U2 3 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD OCT 2 PY 1992 VL 258 IS 5079 BP 14 EP 15 DI 10.1126/science.258.5079.14 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JQ619 UT WOS:A1992JQ61900004 PM 17835875 ER PT J AU SANO, T SMITH, CL CANTOR, CR AF SANO, T SMITH, CL CANTOR, CR TI IMMUNO-PCR - VERY SENSITIVE ANTIGEN-DETECTION BY MEANS OF SPECIFIC ANTIBODY-DNA CONJUGATES SO SCIENCE LA English DT Article ID POLYMERASE CHAIN-REACTION; CATALYTIC ANTIBODIES; ESCHERICHIA-COLI; AMPLIFICATION; MOLECULES; CHEMISTRY AB An antigen detection system, termed immuno-polymerase chain reaction (immuno-PCR), was developed in which a specific DNA molecule is used as the marker. A streptavidin-protein A chimera that possesses tight and specific binding affinity both for biotin and immunoglobulin G was used to attach a biotinylated DNA specifically to antigen-monoclonal antibody complexes that had been immobilized on microtiter plate wells. Then, a segment of the attached DNA was amplified by PCR. Analysis of the PCR products by agarose gel electrophoresis after staining with ethidium bromide allowed as few as 580 antigen molecules (9.6 x 10(-22) moles) to be readily and reproducibly detected. Direct comparison with enzyme-linked immunosorbent assay with the use of a chimera-alkaline phosphatase conjugate demonstrates that enhancement (approximately x 10(5)) in detection sensitivity was obtained with the use of immuno-PCR. Given the enormous amplification capability and specificity of PCR, this immuno-PCR technology has a sensitivity greater than any existing antigen detection system and, in principle, could be applied to the detection of single antigen molecules. C1 LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. RP SANO, T (reprint author), UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720, USA. OI Smith, Cassandra/0000-0002-0346-8907 FU NCI NIH HHS [CA39782] NR 31 TC 475 Z9 517 U1 7 U2 77 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD OCT 2 PY 1992 VL 258 IS 5079 BP 120 EP 122 DI 10.1126/science.1439758 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JQ619 UT WOS:A1992JQ61900032 PM 1439758 ER PT J AU STANLEY, WD GWILLIAM, WJ LATHAM, G WESTHUSING, K AF STANLEY, WD GWILLIAM, WJ LATHAM, G WESTHUSING, K TI THE SOUTHERN WASHINGTON CASCADES CONDUCTOR - A PREVIOUSLY UNRECOGNIZED THICK SEDIMENTARY SEQUENCE SO AAPG BULLETIN-AMERICAN ASSOCIATION OF PETROLEUM GEOLOGISTS LA English DT Article ID WESTERN OREGON; NORTH-AMERICA; COAST RANGE; FAULT; STRATIGRAPHY; EVOLUTION; ISLAND; MARGIN; EOCENE AB Geophysical studies in the southern Washington Cascades have outlined a possible, previously unrecognized sequence of sedimentary rocks. These postulated sedimentary units are interpreted to correspond to at least the upper section of a low-resistivity (high-conductivity) assemblage of rocks at depths of 1-10 km and with thicknesses up to 15 km that we call the southern Washington Cascades conductor (SWCC). Structure on the upper surface of this conductive assemblage correlates in some places with anticlines that bring Tertiary marine rocks near the surface. These anticlines have recently been imaged in detail with seismic reflection surveys. The conductive rocks have also been traced to the surface west of Morton, Washington, where they correlate with Eocene marine sandstones and shales. The geometry of the conductive rocks consists of a east-dipping, low-angle wedge that thickens to the north and with an undulating upper surface corresponding to the anticlines. We suspect that marine sedimentary rocks are the primary constituent of the SWCC, but recognize that parts of the conductive section may be composed of nonmarine and marginal marine sedimentary rocks like those in the upper part of the Puget Group. Geothermal fluids may be a contributing factor to low resistivities in the deeper parts of the conductive section (greater than 6-7 km). Other possible candidates for the conductive units are thick sections of highly altered volcanic flows and/or graphitic (conductive), pre-Tertiary, metamorphic rocks. C1 MORGANTOWN ENERGY TECHNOL CTR,DEPT ENERGY,MORGANTOWN,WV 26505. RP STANLEY, WD (reprint author), US GEOL SURVEY,DENVER FED CTR,BOX 25046,MS964,DENVER,CO 80225, USA. NR 54 TC 9 Z9 9 U1 0 U2 1 PU AMER ASSOC PETROLEUM GEOLOGIST PI TULSA PA 1444 S BOULDER AVE, PO BOX 979, TULSA, OK 74101 SN 0149-1423 J9 AAPG BULL JI AAPG Bull.-Am. Assoc. Petr. Geol. PD OCT PY 1992 VL 76 IS 10 BP 1569 EP 1585 PG 17 WC Geosciences, Multidisciplinary SC Geology GA JW709 UT WOS:A1992JW70900007 ER PT J AU MCMULLAN, RK KVICK, A POPELIER, P AF MCMULLAN, RK KVICK, A POPELIER, P TI STRUCTURES OF CUBIC AND ORTHORHOMBIC PHASES OF ACETYLENE BY SINGLE-CRYSTAL NEUTRON-DIFFRACTION SO ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE LA English DT Article AB The crystal structures of acetylene (C2H2) at 131 and 141 K and deuteroacetylene (C2D2) at 143 and 15 K have been refined by least-squares methods using single-crystal neutron diffraction data. Crystal data: C2H2, orthorhombic, Pa3, Z = 4, F(000) = 23.26 fm, mu(n) = 1.46 cm-1; T = 131, 141 K; a(o) = 6.0940 (8), 6.1050 (8) angstrom; V = 226.31 (9), 227.54 (9) angstrom3, D(n) = 0.7643 (3), 0.7602 (3) g cm-3, R(F2) = 0.065, 0.052; wR(F2) = 0.082, 0.064; S = 1.47, 1.33 for 120, 122 unique reflections [(sintheta/lambda) < 0.79 angstrom-1] and 8 variable parameters. C2D2, mu(n) = 1.2 x 10(-4) cm-1, at T = 143 K, orthorhombic, Pa3, Z = 4, F(000) = 106.58 fm, a(o) = 6.1020 (7) angstrom, V = 227.20 (8) angstrom3, D(n) = 0.8201 (3) g cm -3; at T = 15 K, cubic, Acam, Z = 4, a = 6.198 (4), b = 6.023 (4), c = 5.578 (2) angstrom, V = 208.2 (3) angstrom3, D(n) = 0.895 (1) g cm-3 . At 143 and 15 K, R(F2) = 0.097, 0.096; wR(F 2) = 0.068, 0.081; S = 1.36, 1.63 for 120, 119 unique reflections [(sintheta/lambda) less-than-or-equal-to 0. 79, 0.74 angstrom-1] and 8, 14 variable parameters. In the cubic structure, molecules lie at fourfold (3BAR) positions and exhibit pronounced librational motion about their centers of mass. In the orthorhombic structure, molecules in fourfold (2/m) positions are aligned with molecular axes near [110] directions. At 15 K, notably short intermolecular D...C=C separations of 2.737 and 2.738 A within the (001) planes are attributed to weak D-donor to C=C pi-acceptor interactions. At 131, 141 and 143 K, the observed C-C and C-H(D) bond lengths are strongly affected by thermal motion and are less accurate than the precision indicated by the e.s.d.'s C-C 0.004-0.006, C-H 0.0084.010 and C-D 0.003 angstrom. Bond lengths C-C 1. 193 (6) and C-D 1.070 (5) angstrom at 15 K are within 2 e.s.d.'s. of the r(e) gas-phase Raman values. C1 UNIV INSTELLING ANTWERP,DEPT CHEM,B-2610 WILRIJK,BELGIUM. RP MCMULLAN, RK (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 29 TC 79 Z9 79 U1 1 U2 10 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-7681 J9 ACTA CRYSTALLOGR B JI Acta Crystallogr. Sect. B-Struct. Commun. PD OCT 1 PY 1992 VL 48 BP 726 EP 731 DI 10.1107/S0108768192004774 PN 5 PG 6 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA JU408 UT WOS:A1992JU40800024 ER PT J AU MCCORMACK, M MORRIS, JW AF MCCORMACK, M MORRIS, JW TI STRAIN-INDUCED SHAPE CHANGES OF CUBIC PRECIPITATES IN A CUBIC MATRIX WITH POSITIVE ANISOTROPY SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID MORPHOLOGY; ALLOYS; ZIRCONIA; ZRO2 AB This paper considers the evolution of equilibrium shape during the coarsening of a system of cubic precipitates in a cubic matrix with positive anisotropy (DELTA = c11 - c12 - 2c44 > 0). The system is assumed to have homogeneous elastic constants and isotropic surface tension. The low-energy shapes include the sphere, and the octahedron, tetrahedron and plate with {111} faces. Minimization of the sum of the elastic and surface energies shows that the sphere is preferred at arbitrarily small sizes, but ordinarily transforms into a tetrahedron, and finally into a plate as size increases. When DELTA > 0.79c11 the octahedron is preferred for a small range of sizes between sphere and tetrahedron. Analytic expressions are given for the equilibrium shape transitions. The results are compared to experimental observations of shape changes during coarsening in (Mg, Y)-ZrO2. The experimentally observed absence of octahedral shaped precipitates and the size at which tetrahedral shaped precipitates become stable in this system are consistent with the theoretical predictions. C1 LAWRENCE BERKELEY LAB, CTR ADV MAT, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT MAT SCI & MINERAL ENGN, BERKELEY, CA 94720 USA. NR 21 TC 6 Z9 6 U1 0 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD OCT PY 1992 VL 40 IS 10 BP 2489 EP 2495 DI 10.1016/0956-7151(92)90318-9 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JM229 UT WOS:A1992JM22900003 ER PT J AU LEON, RP WEBER, ER AF LEON, RP WEBER, ER TI A NEW TYPE OF SEMIINSULATING MATERIALS SO ACTA PHYSICA POLONICA A LA English DT Article; Proceedings Paper CT 21ST INTERNATIONAL SCHOOL ON PHYSICS OF SEMICONDUCTING COMPOUNDS ( JASZOWIEC-1992 ) CY MAY 22-29, 1992 CL JASZOWIEC, POLAND SP STEFAN BATORY FDN, AMER PHYS SOC, INT PHYS GRP ID LAYERS AB The introduction of Cu in InP at 700-degrees-C and higher temperatures results in both initially p-type and n-type InP become semi-insulating. It is also observed that thermally stable In-Cu rich precipitates form, that the concentration of deep levels is negligible and that InP:Cu samples exhibit inhomogeneities and anomalous transport behavior. The buried Schottky barrier model is the only model thus far studied which is consistent with these experimental observations. This model has general applicability, and its possible relevance to other semiconductors is examined. The conditions necessary for forming quasi-intrinsic semiconductors by metallic precipitation are discussed. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP LEON, RP (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI,BERKELEY,CA 94720, USA. NR 9 TC 3 Z9 3 U1 0 U2 0 PU POLISH ACAD SCIENCES INST PHYSICS PI WARSAW PA AL LOTNIKOW 32-46, 02-668 WARSAW, POLAND SN 0587-4246 J9 ACTA PHYS POL A JI Acta Phys. Pol. A PD OCT PY 1992 VL 82 IS 4 BP 664 EP 679 PG 16 WC Physics, Multidisciplinary SC Physics GA KC496 UT WOS:A1992KC49600023 ER PT J AU BARANOWSKI, JM WOJCIK, P PALCZEWSKA, M JABLONSKI, R WEBER, ER YAU, WF SOHN, H WERNER, P AF BARANOWSKI, JM WOJCIK, P PALCZEWSKA, M JABLONSKI, R WEBER, ER YAU, WF SOHN, H WERNER, P TI SUPERCONDUCTIVITY IN INDIUM DIFFUSED GAAS SO ACTA PHYSICA POLONICA A LA English DT Article; Proceedings Paper CT 21ST INTERNATIONAL SCHOOL ON PHYSICS OF SEMICONDUCTING COMPOUNDS ( JASZOWIEC-1992 ) CY MAY 22-29, 1992 CL JASZOWIEC, POLAND SP STEFAN BATORY FDN, AMER PHYS SOC, INT PHYS GRP AB Superconductivity of indium diffused GaAs was investigated. The superconductivity in these samples was identified by the magnetic susceptibility and the characteristic field modulated microwave absorption. The static magnetic susceptibility was measured from 40 K down to 2.5 K. The result shows two distinctive diamagnetic contributions within 7 K-2.5 K range. These diamagnetic contributions were correlated with the excess of In and Ga metal in GaAs. C1 INST ELECTR MAT TECHNOL,PL-01919 WARSAW,POLAND. UNIV CALIF BERKELEY,DEPT MAT SCI,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP BARANOWSKI, JM (reprint author), UNIV WARSAW,INST EXPTL PHYS,PL-00681 WARSAW,POLAND. NR 4 TC 0 Z9 0 U1 1 U2 1 PU POLISH ACAD SCIENCES INST PHYSICS PI WARSAW PA AL LOTNIKOW 32-46, 02-668 WARSAW, POLAND SN 0587-4246 J9 ACTA PHYS POL A JI Acta Phys. Pol. A PD OCT PY 1992 VL 82 IS 4 BP 670 EP 673 PG 4 WC Physics, Multidisciplinary SC Physics GA KC496 UT WOS:A1992KC49600024 ER PT J AU AUSTIN, MA SANDHOLZER, C SELBY, JV NEWMAN, B KRAUSS, RM UTERMANN, G AF AUSTIN, MA SANDHOLZER, C SELBY, JV NEWMAN, B KRAUSS, RM UTERMANN, G TI LIPOPROTEIN(A) IN WOMEN TWINS - HERITABILITY AND RELATIONSHIP TO APOLIPOPROTEIN(A) PHENOTYPES SO AMERICAN JOURNAL OF HUMAN GENETICS LA English DT Article ID CORONARY HEART-DISEASE; LP(A) GLYCOPROTEIN PHENOTYPES; PLASMA LP(A); RISK-FACTORS; CEREBROVASCULAR-DISEASE; MYOCARDIAL-INFARCTION; PLASMINOGEN-ACTIVATOR; GENETIC HERITABILITY; A-I; TRAIT AB Lp(a) is a unique lipoprotein consisting of an LDL-like particle and a characteristic protein, apo(a). Increased levels of Lp(a) constitute a risk factor for coronary heart disease. Variation in the size of the apo(a) protein is a phenotype controlled by the apo(a) gene on chromosome 6 and is related to Lp(a) plasma levels. Based on 169 MZ and 125 DZ adult female twin pairs, this study's purpose was to estimate the proportion of the variation in Lp(a) levels that is due to genetic influences and to determine the extent to which the apo(a) locus explains this heritability. Lp(a) levels were significantly more similar in MZ twins than in DZ twins: mean co-twin differences were 3.9 +/- 5.7 mg/dl and 16.0 +/- 19.9 mg/dl (P < .001), respectively. Intraclass correlations were .94 in MZ twins and .32 in DZ twins, resulting in a heritability estimate of .94 (P < .001). Heritability was then calculated using only co-twins with the same apo(a) phenotype: the heritability estimate decreased to .45 but was still highly significant (P < .001). Therefore, on the basis of heritability analysis of women twins, Lp(a) levels are almost entirely genetically controlled. Variation at the apo(a) locus contributes to this heritability, although other genetic factors could be involved. C1 UNIV INNSBRUCK,INST MED BIOL & HUMAN GENET,A-6020 INNSBRUCK,AUSTRIA. KAISER PERMANENTE MED CARE PROGRAM,DIV RES,OAKLAND,CA. UNIV N CAROLINA,SCH PUBL HLTH,DEPT EPIDEMIOL,CHAPEL HILL,NC 27514. LAWRENCE BERKELEY LAB,DONNER LAB,BERKELEY,CA 94720. RP AUSTIN, MA (reprint author), UNIV WASHINGTON,SCH PUBL HLTH & COMMUNITY MED,DEPT EPIDEMIOL,SC-36,SEATTLE,WA 98195, USA. FU NHLBI NIH HHS [HL-41830, HL-387B0]; PHS HHS [R-01] NR 66 TC 85 Z9 85 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0002-9297 J9 AM J HUM GENET JI Am. J. Hum. Genet. PD OCT PY 1992 VL 51 IS 4 BP 829 EP 840 PG 12 WC Genetics & Heredity SC Genetics & Heredity GA JQ667 UT WOS:A1992JQ66700017 PM 1415225 ER PT J AU KRAUSS, RM BURKMAN, RT AF KRAUSS, RM BURKMAN, RT TI THE METABOLIC IMPACT OF ORAL-CONTRACEPTIVES SO AMERICAN JOURNAL OF OBSTETRICS AND GYNECOLOGY LA English DT Article DE METABOLIC IMPACT; LIPID AND CARBOHYDRATE METABOLISM; CARDIOVASCULAR RISK ID CORONARY-ARTERY ATHEROSCLEROSIS; RANDOMIZED CLINICAL-TRIAL; HIGH-DENSITY LIPOPROTEIN; CARBOHYDRATE-METABOLISM; PROGESTINS; POTENCY; LIPIDS AB The hormonal components of oral contraceptives exert major effects on plasma lipoprotein metabolism. Estrogens may increase production of plasma triglycerides, leading to increased levels of very low-density lipoproteins, but they may also reduce levels of cholesterol-enriched and potentially atherogenic intermediate- and low-density lipoproteins. Furthermore, estrogens increase levels of high-density lipoproteins (HDLs), particularly the HDL2 subspecies, an effect linked to reduced mortality rates from cardiovascular disease in postmenopausal women receiving hormone replacement therapy. All combination oral contraceptives in use in the United States tend to raise levels of plasma triglycerides, low-density lipoprotein, and HDL3 to varying degrees. In contrast, changes in HDL and HDL, reflect the combined effects of estrogen dose and relative androgenicity of the progestin component. Although in general, the lipoprotein changes are greater in magnitude with higher dose oral contraceptive preparations, they can be significant in lower dose preparations as well. Oral contraceptives also affect carbohydrate metabolism, primarily through the activity of progestin. Studies have demonstrated insulin resistance, rises in plasma insulin, and relative glucose intolerance by means of curve analysis of glucose tolerance tests. These effects are far less pronounced with lower dose preparations and with formulations using the newer progestins. C1 HENRY FORD HOSP,DEPT GYNECOL OBSTET,DETROIT,MI 48202. RP KRAUSS, RM (reprint author), LAWRENCE BERKELEY LAB,DONNER LAB 465,BERKELEY,CA 94720, USA. NR 21 TC 56 Z9 56 U1 0 U2 2 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0002-9378 J9 AM J OBSTET GYNECOL JI Am. J. Obstet. Gynecol. PD OCT PY 1992 VL 167 IS 4 SU S BP 1177 EP 1184 PN 2 PG 8 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA JV006 UT WOS:A1992JV00600005 PM 1415443 ER PT J AU SKORDOS, PA ZUREK, WH AF SKORDOS, PA ZUREK, WH TI MAXWELL DEMON, RECTIFIERS, AND THE 2ND LAW - COMPUTER-SIMULATION OF SMOLUCHOWSKI TRAPDOOR SO AMERICAN JOURNAL OF PHYSICS LA English DT Article AB An automated version of Maxwell's demon inspired by Smoluchowski's ideas of 1912 is simulated numerically. Two gas chambers of equal volume are connected via an opening that is covered by a trapdoor. The trapdoor can open to the left but not to the right, and is intended to rectify naturally occurring fluctuations in density between the two chambers. The simulation results confirm that though the trapdoor behaves as a rectifier when large density differences are imposed by external means, it cannot extract useful work from the thermal motion of the molecules when left on its own. C1 MIT,CAMBRIDGE,MA 02139. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP SKORDOS, PA (reprint author), SANTA FE INST,SANTA FE,NM, USA. NR 21 TC 22 Z9 22 U1 0 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0002-9505 J9 AM J PHYS JI Am. J. Phys. PD OCT PY 1992 VL 60 IS 10 BP 876 EP 882 DI 10.1119/1.17007 PG 7 WC Education, Scientific Disciplines; Physics, Multidisciplinary SC Education & Educational Research; Physics GA JP224 UT WOS:A1992JP22400005 ER PT J AU PERRY, RE WELLER, RE BUSCHBOM, RL DAGLE, GE PARK, JF AF PERRY, RE WELLER, RE BUSCHBOM, RL DAGLE, GE PARK, JF TI RADIOGRAPHICALLY DETERMINED GROWTH DYNAMICS OF PRIMARY LUNG-TUMORS INDUCED IN DOGS BY INHALATION OF PLUTONIUM SO AMERICAN JOURNAL OF VETERINARY RESEARCH LA English DT Article ID HUMAN PULMONARY NEOPLASMS; VOLUME DOUBLING TIME; CANCER AB Beagles were exposed to aerosols of (PuO2)-Pu239, (PuO2)-Pu-238, or Pu-239(NO3)4. Exponential growth constants for 50 primary lung tumors (23 bronchioloalveolar carcinomas, 22 papillary adenocarcinomas, 5 adenosquamous carcinomas) were calculated in 37 dogs, using sequential thoracic radiography. A wide range in doubling time (6 to 287 days) was observed. Mean +/- SEM doubling time was 93 +/- 10 days for bronchioloalveolar carcinoma, 107 +/- 13 days for papillary adenocarcinoma, and 101 +/- 36 days for adenosquamous carcinoma. Lung tumor growth rate in dogs was comparable to that in human patients with similar histologic tumor types. Linear regression analysis revealed significant (P less-than-or-equal-to 0.0001) correlation between doubling time and survival of individual dogs. Doubling time was not significantly dependent on tumor type, sex, age at time of diagnosis, initial lung deposition, or isotope. Extrapolating time to tumor onset from tumor doubling time cannot be used to reliably predict the onset of malignancy. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. MICHIGAN STATE UNIV, COLL VET MED, DEPT RADIOL, E LANSING, MI 48824 USA. NR 22 TC 6 Z9 6 U1 0 U2 1 PU AMER VETERINARY MEDICAL ASSOC PI SCHAUMBURG PA 1931 N MEACHAM RD SUITE 100, SCHAUMBURG, IL 60173-4360 SN 0002-9645 J9 AM J VET RES JI Am. J. Vet. Res. PD OCT PY 1992 VL 53 IS 10 BP 1740 EP 1743 PG 4 WC Veterinary Sciences SC Veterinary Sciences GA JQ653 UT WOS:A1992JQ65300004 PM 1456511 ER PT J AU DORRIES, AM VALBERG, PA AF DORRIES, AM VALBERG, PA TI HETEROGENEITY OF PHAGOCYTOSIS FOR INHALED VERSUS INSTILLED MATERIAL SO AMERICAN REVIEW OF RESPIRATORY DISEASE LA English DT Article ID MAGNETIC PARTICLE MOTIONS; IRON-OXIDE AEROSOLS; INTRATRACHEAL INSTILLATION; PULMONARY MACROPHAGES; ALPHA-RADIATION; FERRIC-OXIDE; LIVING CELLS; HAMSTER; INHALATION; CLEARANCE AB Animal experiments involving lung exposure to particles and toxins often use intratracheal instillation, although inhalation is more physiologically relevant to human respiratory tract exposures. Using nontoxic magnetic particles, we examined the particle content distribution within the macrophage population lavaged from the lungs of Syrian golden hamsters exposed either by inhalation or by intratracheal instillation. One to 3 days after iron oxide particle delivery to the lungs, lung macrophages were harvested from animals in pairs, one exposed by inhalation and one exposed by instillation. The macrophages were then magnetically fractionated according to magnetic iron oxide content by flowing the cell suspension through tubing placed within the magnetic field gradient of an electromagnet. Macrophages that had ingested the largest quantity of magnetic iron oxide preferentially collected adjacent to the tubing wall when the electromagnet was at its lowest current; those with fewer particulates collected at correspondingly higher amperages; those cells that were never pulled out of the flowing stream had little or no magnetic iron oxide content. Our results showed that 80% of the lavaged cell population from animals exposed by inhalation had measurable particle content, whereas by instillation, many cells (70%) received no dose ast all. Exposure by inhalation produced a more even distribution of dose among lung macrophages. Macrophage Intracellular motions showed a decrease when cell content exceeded 7 to 8% of cell volume. We conclude that the method of particle delivery to lungs can influence the dose distribution among lung macrophages. C1 GRADIENT CORP,44 BRATTLE ST,CAMBRIDGE,MA 02138. LOS ALAMOS NATL LAB,IND HYG GRP,LOS ALAMOS,NM 87544. HARVARD UNIV,SCH PUBL HLTH,DEPT ENVIRONM HLTH,RESP BIOL PROGRAM,CAMBRIDGE,MA 02138. FU NCI NIH HHS [CA-40696]; NHLBI NIH HHS [HL-36427] NR 30 TC 25 Z9 25 U1 0 U2 2 PU AMER LUNG ASSOC PI NEW YORK PA 1740 BROADWAY, NEW YORK, NY 10019 SN 0003-0805 J9 AM REV RESPIR DIS JI Am. Rev. Respir. Dis. PD OCT PY 1992 VL 146 IS 4 BP 831 EP 837 PG 7 WC Respiratory System SC Respiratory System GA JR471 UT WOS:A1992JR47100004 PM 1416406 ER PT J AU JANATA, J AF JANATA, J TI ION OPTODES SO ANALYTICAL CHEMISTRY LA English DT Article ID POLY(VINYL CHLORIDE) MEMBRANE; OPTICAL SENSORS; NEUTRAL IONOPHORES; SELECTIVE OPTRODE; FLUORIMETRIC MEASUREMENT; CHEMICAL SENSORS; ACRIDINE ORANGE; POTASSIUM; CALCIUM; DESIGN RP JANATA, J (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 29 TC 46 Z9 46 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD OCT 1 PY 1992 VL 64 IS 19 BP A921 EP + PG 0 WC Chemistry, Analytical SC Chemistry GA JQ527 UT WOS:A1992JQ52700002 ER PT J AU AZMY, YY AF AZMY, YY TI ARBITRARILY HIGH-ORDER CHARACTERISTIC METHODS FOR SOLVING THE NEUTRON-TRANSPORT EQUATION SO ANNALS OF NUCLEAR ENERGY LA English DT Article ID GEOMETRY; ALGORITHM; SCHEMES; FORM AB We derive an arbitrarily high order characteristic method and describe its implementation in an Arbitrarily High Order Transport (AHOT) code, together with a previously derived nodal method. We test the accuracy and computational efficiency of the implemented methods by solving a one group homogeneous problem with three values of the scattering ratio, and a three group, three region shielding problem. We find that the nodal method is more accurate in computing quantities related to the scalar flux, while the characteristic method computes quantities strongly influenced by neutron streaming more accurately. The difference in accuracy between the two methods diminishes as the scattering ratio increases. Also, by monitoring the number of negative cell-averaged scalar fluxes as a fraction of the total number of computational cells in each case we find that even order methods are far less likely to produce negative fluxes. Furthermore, we observe that an even order characteristic method is less susceptible to converging negative cell-averaged scalar fluxes than the same order nodal method. RP AZMY, YY (reprint author), OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,OAK RIDGE,TN 37831, USA. NR 25 TC 17 Z9 17 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0306-4549 J9 ANN NUCL ENERGY JI Ann. Nucl. Energy PD OCT-DEC PY 1992 VL 19 IS 10-12 BP 593 EP 606 DI 10.1016/0306-4549(92)90004-U PG 14 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JW115 UT WOS:A1992JW11500002 ER PT J AU IYENGAR, SS SABHARWAL, A PIN, FG WEISBIN, CR AF IYENGAR, SS SABHARWAL, A PIN, FG WEISBIN, CR TI ASYNCHRONOUS PRODUCTION SYSTEM FOR CONTROL OF AN AUTONOMOUS MOBILE ROBOT IN REAL-TIME ENVIRONMENT SO APPLIED ARTIFICIAL INTELLIGENCE LA English DT Article AB Autonomous robotic systems designed for hazardous environments require the development of onboard real-time knowledge-based systems capable of generating inference-driven responses to asynchronous, external stimuli. Building such real-time expert systems involves the integration of traditional-knowledge engineering methodologies with time-constrained response and control capabilities. To address such requirements, the Asynchronous Production System (APS), which is a rule-based inference engine capable of dynamic and rapid interaction with its environment, is presented. The APS uses a concurrent-event-driven execution mechanism and an external input-data structure to facilitate the monitoring and processing of real-time asynchronous information. The enhanced conflict-resolution strategies and rule-interruptibility features of the APS execution mechanism allows the APS to make efficient use of the onboard system resources. The implementation of the APS involves the development of a shared-memory, multiprocessor architecture operating in MIMD mode. This articles provides a description of the APS and presents a prototype APS-based expert system developed to handle external emergencies for the HERMIES IIB (Hostile Environment Robotic Machine Intelligent Experiment Series) robot. The prototype expert system demonstrates APS' capabilities of handling multiple levels of emergencies and performing knowledge-based recovery after the asynchronous information is processed. C1 LOUISIANA STATE UNIV,DEPT COMP SCI & ELECT ENGN,BATON ROUGE,LA 70803. OAK RIDGE NATL LAB,CTR ENGN SYST ADV RES,OAK RIDGE,TN 37831. NR 28 TC 1 Z9 1 U1 0 U2 0 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0883-9514 J9 APPL ARTIF INTELL JI Appl. Artif. Intell. PD OCT-DEC PY 1992 VL 6 IS 4 BP 485 EP 509 DI 10.1080/08839519208949968 PG 25 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA KD406 UT WOS:A1992KD40600005 ER PT J AU THOMAS, IM AF THOMAS, IM TI METHOD FOR THE PREPARATION OF POROUS SILICA ANTIREFLECTION COATINGS VARYING IN REFRACTIVE-INDEX FROM 1.22 TO 1.44 SO APPLIED OPTICS LA English DT Article DE THIN FILMS; ANTIREFLECTION COATINGS; POROUS COATINGS; SOL-GEL METHOD AB Coatings of refractive index that vary between 1.22 and 1.44 were prepared from combinations of a colloidal silica suspension and a polysiloxane solution. The polysiloxane acted both as a binder and a filler for the colloidal silica particles. Increasing ratios gave coatings of lower porosity, hence higher refractive index, and better abrasion resistance. This variation in refractive index allowed high-efficiency quarter-wave antireflection coatings to be prepared on substrates whose index varied from 1.45 to 2.1. The laser damage thresholds of all the coatings were > 50 J/cm2 at a wavelength of 1.06 mum with a 10-ns pulse length. RP THOMAS, IM (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5508,L-483,LIVERMORE,CA 94550, USA. NR 8 TC 116 Z9 130 U1 7 U2 29 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD OCT 1 PY 1992 VL 31 IS 28 BP 6145 EP 6149 PG 5 WC Optics SC Optics GA JQ242 UT WOS:A1992JQ24200040 PM 20733821 ER PT J AU SCHERBAN, T NOWICK, AS BOATNER, LA ABRAHAM, MM AF SCHERBAN, T NOWICK, AS BOATNER, LA ABRAHAM, MM TI PROTONS AND OTHER DEFECTS IN FE-DOPED KTAO(3) SO APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING LA English DT Article ID PARAMAGNETIC RESONANCE SPECTROSCOPY; TEXTURED CERAMICS; SOLUBILITY; CONDUCTION AB The properties of defects in Fe-doped KTaO3, both in the form of single crystals and polycrystalline ceramics, have been investigated for a wide range of Fe concentrations. The techniques employed included infrared (IR) absorption, electron paramagnetic resonance (EPR), and ac electrical conductivity together with complex-impedance analysis. Samples were pretreated (at 900-degrees-C) in water vapor to introduce protons which take the form of OH(O). defects, and were also treated at various oxygen partial pressures. A calibration of the OH- IR absorption band was carried out with the aid of a deuterium nuclear-probe method. EPR showed cubic and axial Fe3+ spectra, but only the axial spectrum appeared for crystals with high Fe concentrations. Predominantly proton conductivity was observed for samples treated in reducing atmospheres, and a proton-hopping activation energy of 0.73 eV was deduced. For samples treated in high oxygen pressures, however, hole conduction dominated. Evidence for proton interaction effects was also found, but the nature of the traps is not clear. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP SCHERBAN, T (reprint author), COLUMBIA UNIV,HENRY KRUMB SCH MINES,NEW YORK,NY 10027, USA. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 31 TC 38 Z9 38 U1 0 U2 5 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0947-8396 J9 APPL PHYS A-MATER JI Appl. Phys. A-Mater. Sci. Process. PD OCT PY 1992 VL 55 IS 4 BP 324 EP 331 DI 10.1007/BF00324079 PG 8 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA JR463 UT WOS:A1992JR46300004 ER PT J AU WANGMANEERAT, B NIEMCZYK, TM HAALAND, DM AF WANGMANEERAT, B NIEMCZYK, TM HAALAND, DM TI DETERMINATION OF TEMPERATURE AND COMPOSITION OF PHOSPHOSILICATE GLASS THIN-FILMS FROM INFRARED-EMISSION SPECTRAL DATA SO APPLIED SPECTROSCOPY LA English DT Article DE INFRARED; INFRARED EMISSION; CHEMOMETRICS ID LEAST-SQUARES METHODS; SPECTROSCOPY; SILICON AB Multivariate calibration methods were combined with full-spectrum IR emission data to determine the temperature and phosphorus (P) content of phosphosilicate glass (PSG) thin films on silicon wafers. The 12 PSG calibration samples varied in phosphorus content across the range of 1 to 6 wt %, and sample temperatures ranged from 119 to 225-degrees-C. The multivariate partial least-squares (PLS) algorithm was applied to both single-beam and emittance spectral data over the range of 450 to 1600 cm-1. The predictive abilities of the PLS models were obtained from the standard errors of prediction (SEP) calculated with cross-validation procedures. The cross-validated SEPs were 1.9-degrees-C for temperature determination and 0.13 wt % for P content. These SEPs were limited by the temperature controller for temperature determination and by the reference method for P determination. Full-spectrum multivariate calibration methods have been shown to be capable of precise and accurate temperature measurements in the presence of variations in sample emittances due to concentration differences. These results demonstrate the power of multivariate calibration for use in multiwavelength pyrometry. These techniques also demonstrate the potential to perform in situ, real-time process monitoring and precise temperature measurement during the deposition of thin dielectric films on silicon wafers. C1 UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 15 TC 9 Z9 9 U1 0 U2 1 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 201B BROADWAY ST, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD OCT PY 1992 VL 46 IS 10 BP 1447 EP 1453 PG 7 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA JU418 UT WOS:A1992JU41800002 ER PT J AU CHEN, G HAIRE, RG PETERSON, JR AF CHEN, G HAIRE, RG PETERSON, JR TI COMPRESSIBILITIES OF TBVO4 AND DYVO4 CALCULATED FROM SPECTROSCOPIC DATA SO APPLIED SPECTROSCOPY LA English DT Article DE RAMAN SPECTROSCOPY; SPECTROSCOPIC TECHNIQUES; COMPRESSIBILITY; EQUATION OF STATE ID RAMAN AB The compressibilities of TbVO4 and DyVO4 were estimated indirectly from the pressure dependence of the Raman stretching frequencies of the vanadium-oxygen (V-O) bonds, nu1(A(g)), through an empirical correlation between nu1(A(g)) and the corresponding bond lengths. Volume compressibilities of 6.71 x 10(-3) GPa-1 (bulk modulus 149 GPa) and 6.23 x 10(-3) GPa-1 (bulk modulus 160 GPa) were derived for TbVO4 and DyVO4, respectively. This approach provides a straightforward method to estimate the compressibility and equation of state (EOS) of crystals via Raman spectroscopic measurements. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV CHEM,TRANSURANIUM RES LAB,OAK RIDGE,TN 37831. NR 9 TC 6 Z9 6 U1 0 U2 5 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 201B BROADWAY ST, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD OCT PY 1992 VL 46 IS 10 BP 1495 EP 1497 PG 3 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA JU418 UT WOS:A1992JU41800011 ER PT J AU CRAIN, JS MIKESELL, BL AF CRAIN, JS MIKESELL, BL TI DETECTION OF SUB-NG/L ACTINIDES IN INDUSTRIAL WASTE-WATER MATRICES BY INDUCTIVELY COUPLED PLASMA MASS-SPECTROMETRY SO APPLIED SPECTROSCOPY LA English DT Article DE INDUCTIVELY COUPLED PLASMA-MASS SPECTROMETRY; TRACE ACTINIDE MEASUREMENTS; WASTE-WATER ANALYSIS AB Inductively coupled plasma-mass spectrometry (ICP-MS) was used to measure ng/L quantities of uranium in solution. Pneumatic nebulization and ultrasonic nebulization were compared. The spectral integration period was varied to study the effects of counting statistics. Analyte detection at m/z 238 was found to be blank limited. Under optimal conditions (i.e., with the use of ultrasonic nebulization and an 11-s integration period per m/z), uranium detection limits (3sigma) at m/z 234 (not blank limited) were found to be 0.1 ng/L in 18-MOMEGA water. The uranium detection limit at m/z 234 was 0.5 ng/L when a 2.5-g/L NaNO3 solution was nebulized. Normalized instrument response for uranium in 18-MOMEGA water agreed well with that in 2.5-g/L NaNO3. C1 LOS ALAMOS NATL LAB,DIV CHEM & LASER SCI,ANALYT CHEM GRP,LOS ALAMOS,NM 87545. NR 9 TC 14 Z9 14 U1 0 U2 1 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 201B BROADWAY ST, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD OCT PY 1992 VL 46 IS 10 BP 1498 EP 1502 PG 5 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA JU418 UT WOS:A1992JU41800012 ER PT J AU FERRARO, JR WANG, HH WHANGBO, MH STOUT, P AF FERRARO, JR WANG, HH WHANGBO, MH STOUT, P TI MICROREFLECTANCE INFRARED STUDY OF BIS(ETHYLENEDITHIO)-TETRATHIAFULVALENE (BEDT-TTF OR ET) SALTS SO APPLIED SPECTROSCOPY LA English DT Article DE POLARIZED INFRARED; MICROREFLECTANCE; ORGANIC CONDUCTING SALTS ID PRESSURE ORGANIC SUPERCONDUCTOR; ELECTRON-SPIN-RESONANCE; OPTICAL-PROPERTIES; VIBRATIONAL SPECTROSCOPY; SEMICONDUCTOR TEA(TCNQ)2; MOLECULAR CONSTITUENTS; REFLECTION SPECTRA; LATTICE SOFTNESS; RADICAL CATION; CONDUCTORS AB For several beta- and kappa-phase salts of bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF or simply ET) and its deuterium analog d8-ET, microreflectance infrared spectra were obtained by employing polarized and unpolarized light, and their vibronic regions were examined. These salts exhibit a strong vibronic absorption under polarized light. The vibronic absorption of the beta-phase salts has a much stronger polarization-dependency than that found for the kappa-phase salts. For the beta-phase salts, the optimum vibronic absorption occurs when the polarized light vector is parallel to their donor-molecule stacking direction. Among the ET salts without structural disorder, the highest C-C-H bending frequency for the superconductors is lower than approximately 1320 cm-1 while that for the non-superconductors is higher than approximately 1320 cm-1. C1 BIORAD,DIV DIGILAB,CAMBRIDGE,MA 02137. N CAROLINA STATE UNIV,DEPT CHEM,RALEIGH,NC 27695. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP FERRARO, JR (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 42 TC 1 Z9 1 U1 0 U2 1 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 201B BROADWAY ST, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD OCT PY 1992 VL 46 IS 10 BP 1520 EP 1531 PG 12 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA JU418 UT WOS:A1992JU41800016 ER PT J AU HAALAND, DM ROBINSON, MR KOEPP, GW THOMAS, EV EATON, RP AF HAALAND, DM ROBINSON, MR KOEPP, GW THOMAS, EV EATON, RP TI REAGENTLESS NEAR-INFRARED DETERMINATION OF GLUCOSE IN WHOLE-BLOOD USING MULTIVARIATE CALIBRATION SO APPLIED SPECTROSCOPY LA English DT Article DE NEAR-INFRARED; MULTIVARIATE CALIBRATION; PARTIAL LEAST-SQUARES; GLUCOSE DETERMINATION; BLOOD ANALYSIS ID ATTENUATED TOTAL REFLECTION; LEAST-SQUARES METHODS; SPECTRAL ANALYSES; SPECTROSCOPY AB Noninvasive monitoring of glucose in diabetic patients is feasible with the use of near-infrared spectroscopic measurements. As a step toward the final goal of the development of a noninvasive monitor, the near-infrared spectra (4250 to 6600 cm-1) of glucose-doped whole blood samples were obtained along with reference glucose values. Glucose concentrations and spectra of blood samples obtained from four subjects were subjected to multivariate calibration with the use of partial least-squares (PLS) methods. The cross-validated PLS standard errors of prediction for glucose concentration based on data obtained from each individual subject's blood samples averaged 33 mg/dL over the range from 3 to 743 mg/dL. Cross-validated standard errors for glucose concentration from PLS calibrations based on data from all four subjects were 39 mg/dL. However, when PLS models based upon three subjects' data were used for prediction on the fourth, glucose prediction abilities were poor. It is suggested that blood chemistry differences were sufficiently different for the four subjects to require that a larger number of subjects be included in the calibration for adequate prediction abilities to be obtained from near-infrared spectra of blood from subjects not included in the calibration. C1 UNIV NEW MEXICO,SCH MED,ALBUQUERQUE,NM 87131. RP HAALAND, DM (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 13 TC 85 Z9 86 U1 0 U2 5 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 201B BROADWAY ST, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD OCT PY 1992 VL 46 IS 10 BP 1575 EP 1578 PG 4 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA JU418 UT WOS:A1992JU41800024 ER PT J AU KLATT, LN AF KLATT, LN TI STUDIES OF MULTICHANNEL PHOTOTHERMAL REFRACTION FOR THE MEASUREMENT OF ABSOLUTE ABSORPTIVITY SO APPLIED SPECTROSCOPY LA English DT Article DE PHOTOTHERMAL REFRACTION; ABSOLUTE ABSORPTIVITY; CROSSED BEAM; IRON(II)-PHENANTHROLINE AB Multichannel crossed-beam photothermal refraction experiments have been performed. Iron(II)-phenanthroline in methanol was the test solute. The response as a function of concentration exhibited a nonlinear relationship, which does not agree with the current theoretical description of the phenomena. Although photophysical and photochemical processes were not totally eliminated as possible causes of the nonlinear concentration response, arguments are presented which indicate, for the experimental conditions employed in this study, that these processes are negligible. It is proposed that the heat transfer model must be modified to include refractive index gradients in both the radial and axial coordinates of the pump laser beam. RP KLATT, LN (reprint author), OAK RIDGE NATL LAB,DIV ROBOT & PROC SYST,BLDG 7601,POB 2008,OAK RIDGE,TN 37831, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 201B BROADWAY ST, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD OCT PY 1992 VL 46 IS 10 BP 1583 EP 1586 PG 4 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA JU418 UT WOS:A1992JU41800026 ER PT J AU WHITTEN, WB RAMSEY, JM AF WHITTEN, WB RAMSEY, JM TI PHOTOCOUNT PROBABILITY-DISTRIBUTIONS FOR SINGLE FLUORESCENT MOLECULES SO APPLIED SPECTROSCOPY LA English DT Note DE SINGLE MOLECULE DETECTION, LASER-INDUCED FLUORESCENCE C1 OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 8 TC 15 Z9 15 U1 0 U2 0 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 201B BROADWAY ST, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD OCT PY 1992 VL 46 IS 10 BP 1587 EP 1589 PG 3 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA JU418 UT WOS:A1992JU41800027 ER PT J AU KIELECZAWA, J FRANCE, LL SUTHERLAND, JC HIND, G AF KIELECZAWA, J FRANCE, LL SUTHERLAND, JC HIND, G TI PH-INDUCED CONFORMATIONAL-CHANGES IN SPINACH FERREDOXIN - STEADY-STATE AND TIME-RESOLVED FLUORESCENCE STUDIES SO ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS LA English DT Article ID DIPHTHERIA-TOXIN CONFORMATION; TRYPTOPHAN FLUORESCENCE; NADP REDUCTASE; FLUOROMETER; ASSOCIATION; COTYLEDONS; RESOLUTION; COMPLEX C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. FU NIGMS NIH HHS [GM34662] NR 28 TC 5 Z9 5 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-9861 J9 ARCH BIOCHEM BIOPHYS JI Arch. Biochem. Biophys. PD OCT PY 1992 VL 298 IS 1 BP 63 EP 69 DI 10.1016/0003-9861(92)90094-D PG 7 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JN143 UT WOS:A1992JN14300009 PM 1524443 ER PT J AU ROWE, CL SADINSKI, WJ DUNSON, WA AF ROWE, CL SADINSKI, WJ DUNSON, WA TI EFFECTS OF ACUTE AND CHRONIC ACIDIFICATION ON 3 LARVAL AMPHIBIANS THAT BREED IN TEMPORARY PONDS SO ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY LA English DT Article ID LOW PH; EXPERIMENTAL COMMUNITIES; SALAMANDER PREDATION; TADPOLES; WATER; COMPETITION; ALUMINUM; GROWTH; RESPONSES; DENSITY AB This study explored the effects of acute (7 days) and chronic (4 months) exposure to pH 4.2 on three species of larval amphibians, Ambystoma jeffersonianum, Ambystoma maculatum, and Rana sylvatica. Acute tests were conducted in 24 impermeable enclosures in three temporary ponds. Total dissolved aluminum was higher in acidified enclosures in comparison with controls (pH 4.2, [Al] almost-equal-to 10-30-mu-M and pH >4.7, [Al] almost-equal-to 5-15-mu-M, respectively). Greater mortality of A. jeffersonianum occurred at pH 4.2 than at pH >4.7, whereas survival of A. maculatum and R. sylvatica were unaffected by pH. Mean wet masses of R. sylvatica were significantly lower at pH 4.2 than at pH >4.7, but mean wet masses of surviving A. jeffersonianum and A. maculatum were not influenced by pH. There were no pH-related differences in body sodium concentration in larval R. svlvatica. Chronic acidification of mesocosms to pH 4.2 ([Al] almost-equal-to 16-mu-M) (controls = pH >6, [Al] almost-equal-to 0.1-mu-M) resulted in total mortality of A. jeffersonianum. Survival of A. maculatum and R. sylvatica were not associated with pH, but survival of A. maculatum was low at both pH levels. Time to metamorphosis was longer for R. sylvatica maintained at pH 4.2, but not for A. maculatum. No differences in wet masses at metamorphosis were observed for R. svlvatica or A. maculatum. These results indicate that short and long term acidification of temporary wetlands could dramatically affect amphibians which rely upon them as breeding sites, either by causing mortality or by decreasing growth rates. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP ROWE, CL (reprint author), PENN STATE UNIV,DEPT BIOL,208 MUELLER LAB,UNIV PK,PA 16802, USA. RI Rowe, Christopher/D-5271-2012 NR 38 TC 29 Z9 30 U1 1 U2 10 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0090-4341 J9 ARCH ENVIRON CON TOX JI Arch. Environ. Contam. Toxicol. PD OCT PY 1992 VL 23 IS 3 BP 339 EP 350 PG 12 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA JM340 UT WOS:A1992JM34000011 PM 1456779 ER PT J AU ARASTEH, DK BECK, FA GRIFFITH, BT BYARS, N ACEVEDORUIZ, M AF ARASTEH, DK BECK, FA GRIFFITH, BT BYARS, N ACEVEDORUIZ, M TI USING INFRARED THERMOGRAPHY TO STUDY BUILDING HEAT-TRANSFER SO ASHRAE JOURNAL-AMERICAN SOCIETY OF HEATING REFRIGERATING AND AIR-CONDITIONING ENGINEERS LA English DT Article RP ARASTEH, DK (reprint author), LAWRENCE BERKELEY LAB,WINDOWS & DAYLIGHTING GRP,BERKELEY,CA 94720, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC HEAT REFRIG AIR- CONDITIONING ENG INC PI ATLANTA PA 1791 TULLIE CIRCLE NE, ATLANTA, GA 30329 SN 0001-2491 J9 ASHRAE J JI ASHRAE J.-Am. Soc. Heat Refrig. Air-Cond. Eng. PD OCT PY 1992 VL 34 IS 10 BP 34 EP & PG 0 WC Thermodynamics; Construction & Building Technology; Engineering, Mechanical SC Thermodynamics; Construction & Building Technology; Engineering GA JT888 UT WOS:A1992JT88800008 ER PT J AU ODEA, CP BAUM, SA STANGHELLINI, C DEY, A VANBREUGEL, W DEUSTUA, S SMITH, EP AF ODEA, CP BAUM, SA STANGHELLINI, C DEY, A VANBREUGEL, W DEUSTUA, S SMITH, EP TI RADIO AND OPTICAL OBSERVATIONS OF 0218+357 - THE SMALLEST EINSTEIN RING SO ASTRONOMICAL JOURNAL LA English DT Article ID GALACTIC MAGNETIC-FIELD; SMALL-SCALE VARIATIONS; SURFACE PHOTOMETRY; ROTATION MEASURES; VLA OBSERVATIONS; FARADAY-ROTATION; COMPLETE SAMPLE; STAR FORMATION; GALAXIES; IMAGE AB We present VLA3 radio observations and optical imaging and spectroscopy of 0218 + 357, which has been suggested to be the smallest known Einstein radio ring by Patnaik et al. (1991), preprint. The optical spectrum is rather red (F(nu) is-proportional-to nu(alpha), alpha approximately - 3.5) and shows no strong features. We have a tentative detection of the 4000 angstrom break and the G band which give a redshift of z congruent-to 0.68. The identification is a m(r) congruent-to 20 resolved galaxy, with an absolute magnitude of M(R) approximately - 23.8 or M(B) approximately - 22.0 which is consistent with the radio galaxy host being a brightest cluster member. The ring is detected for the first time at 22.4 GHz, and has basically similar structure at 5, 15, and 22.4 GHz. The ring is highly polarized at 8.4 GHz. Component B has varied in the radio and was approximately 15% brighter in our data than in Patnaik et al.'s. There is very powerful (P1.4 approximately 10(26) W Hz-1) amorphous radio structure extending out to approximately 11" (approximately 70 kpc) from the core. By analogy with previous analyses of Einstein radio rings we suggest that the observed double core and ring structure may be produced by a combination of an off-center radio core with extended radio structure (a jet?) which crosses behind the center of the lensing galaxy. Based on the small angular size of the ring, we estimate a small value for the central radial velocity dispersion of the lens sigma approximately 110 km s-1 which leads to a rather faint absolute magnitude (MB(T)0 approximately - 17.4 for an elliptical via the Faber-Jackson relationship or MB(T)0 approximately - 19.1 for a spiral via the Tully-Fisher relationship). The high value of the observed RM and the difference in RM between A and B may require unusual parameters for the interstellar medium (ISM) of the lens. This is one of the remaining puzzles in the object. In summary, the radio source shares some of the optical and radio properties of BL Lac objects and compact double radio sources and we cannot currently rule out the possibility that the source is not lensed. However, based on the core and ring properties we suggest that the object may well be lensed. In this case, the lensed object is most likely a powerful radio source (a BL Lac object or a Fanaroff-Riley Class I edge-darkened radio galaxy) at a redshift of 0.68, and the lens is a faint, low mass object at an intervening redshift. The small angular scale of the lensed image implies that very small scale structure in the radio source is being lensed. Proper motions in the radio "jet" may be magnified and may be visible as changes in the structure of the Einstein ring. C1 UNIV BOLOGNA,DIPARTIMENTO ASTRON,I-40100 BOLOGNA,ITALY. UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720. LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771. CNR,IST RADIOASTRON,I-40126 BOLOGNA,ITALY. RP ODEA, CP (reprint author), SPACE TELESCOPE SCI INST,3700 SAN MARTIN DR,BALTIMORE,MD 21218, USA. OI Stanghellini, Carlo/0000-0002-6415-854X NR 76 TC 66 Z9 66 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 OCT PY 1992 VL 104 IS 4 BP 1320 EP 1330 DI 10.1086/116321 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JP900 UT WOS:A1992JP90000005 ER PT J AU FILIPPENKO, AV RICHMOND, MW BRANCH, D GASKELL, CM HERBST, W FORD, CH TREFFERS, RR MATHESON, T HO, LC DEY, A SARGENT, WLW SMALL, TA VANBREUGEL, WJM AF FILIPPENKO, AV RICHMOND, MW BRANCH, D GASKELL, CM HERBST, W FORD, CH TREFFERS, RR MATHESON, T HO, LC DEY, A SARGENT, WLW SMALL, TA VANBREUGEL, WJM TI THE SUBLUMINOUS, SPECTROSCOPICALLY PECULIAR TYPE IA SUPERNOVA 1991BG IN THE ELLIPTIC GALAXY NGC 4374 SO ASTRONOMICAL JOURNAL LA English DT Article ID WHITE-DWARFS; ABSOLUTE-MAGNITUDE; DISTANCE SCALE; STANDARD STARS; LIGHT CURVES; CA-II; NA-I; PHOTOMETRY; SPECTROPHOTOMETRY; NGC-5128 AB We present photometric and spectroscopic observations of SN 1991bg, a very peculiar Type Ia supernova located in the outskirts of the El galaxy NGC 4374 (M84) in the Virgo cluster. At maximum brightness SN 1991bg was 1.6 mag subluminous in V and 2.5 mag subluminous in B, compared with normal SNe Ia. The colors were unusually red, but the object was not significantly reddened by dust. The decline from maximum was certainly quite steep; we measure an initial linear V fading of 0. 10 mag d-1 rather than the typical value of 0.06 mag d-1 for SNe Ia, and a late-time decline of 0.034 mag d-1 rather than 0.026 mag d-1. Furthermore, the knee in the V light curve of SN 1991bg occurs only approximately 17 d past B maximum, in contrast to the usual value of 30-40 d. Unlike normal SNe Ia, the I light curve does not exhibit a secondary maximum, and the R light curve shows no sign of a plateau. Despite having prominent Si II absorption near 6150 angstrom, characteristic of SNe Ia, SN 199 1 bg was spectroscopically peculiar at maximum brightness; e.g., a deep trough was present around 4200 angstrom. Spectral synthesis suggests that much of this feature was produced by Ti II. Indeed, Ti II was present elsewhere in the spectrum whereas Fe II was weak or absent. Lines due to other intermediate-mass elements were also strong near maximum brightness, but the expansion velocity (approximately 10 000 km s-1) was slightly lower than average (I 1 000-13 000 km s-1) for SNe Ia. A spectrum obtained 3 weeks past maximum has a rather narrow absorption line attributed to Na I D; the strength of this feature grew with time. In certain other respects the spectrum 3 weeks past maximum more closely resembles spectra of SNe Ib/Ic than of SNe Ia. We identify emission lines of [Ca II] lambdalambda7291, 7324, 0 I lambda7773, the Ca II infrared triplet, and (tentatively) [O I] lambda5577, all superimposed on a complex blend of P Cygni scattering lines; apparently the nebular phase began very early in SN 1991bg. Three months past maximum the [Ca II] blend started to dominate the spectrum. The properties of SN 199 1 bg suggest that this ob ect was produced by the slow deflagration of a white dwarf. The observed expansion velocity, however, is too large unless a sub-Chandrasekhar mass of material was ejected. An unusually low mass for the ejecta, expanding at a nearly normal velocity, is consistent with the early transition to the nebular phase as well as with the rapid decline and the early knee in the V light curve. Thus, SN 1991bg may have resulted from the deflagration of only the outer layer of material on top of a C-O core, thereby leaving a compact remnant; alternatively, perhaps the complete explosion of a low-mass (approximately 1.0 M.) white dwarf was responsible. We show that some properties of the peculiar SN 1986G in Cen A were similar to those of SN 1991bg, and it may have been intrinsically dim by several magnitudes. Moreover, SN 1971I in NGC 5055 is known to have resembled SN 1986G; thus, SN 1991bg was probably a close cousin of these two objects. SN 1991bg clearly demonstrates that at least some SNe Ia are mavericks, both photometrically and spectroscopically. These objects must be carefully eliminated from samples of SNe Ia used in determinations of cosmological parameters. C1 UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720. UNIV OKLAHOMA,DEPT PHYS & ASTRON,NORMAN,OK 73019. WESLEYAN UNIV,VAN VLECK OBSERV,MIDDLETOWN,CT 06457. CALTECH,PALOMAR OBSERV,PASADENA,CA 91125. LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. RP FILIPPENKO, AV (reprint author), UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720, USA. OI Gaskell, C/0000-0003-4888-2009 NR 92 TC 301 Z9 303 U1 0 U2 1 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 OCT PY 1992 VL 104 IS 4 BP 1543 EP 1556 DI 10.1086/116339 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JP900 UT WOS:A1992JP90000023 ER PT J AU BOGGESS, NW MATHER, JC WEISS, R BENNETT, CL CHENG, ES DWEK, E GULKIS, S HAUSER, MG JANSSEN, MA KELSALL, T MEYER, SS MOSELEY, SH MURDOCK, TL SHAFER, RA SILVERBERG, RF SMOOT, GF WILKINSON, DT WRIGHT, EL AF BOGGESS, NW MATHER, JC WEISS, R BENNETT, CL CHENG, ES DWEK, E GULKIS, S HAUSER, MG JANSSEN, MA KELSALL, T MEYER, SS MOSELEY, SH MURDOCK, TL SHAFER, RA SILVERBERG, RF SMOOT, GF WILKINSON, DT WRIGHT, EL TI THE COBE MISSION - ITS DESIGN AND PERFORMANCE 2 YEARS AFTER LAUNCH SO ASTROPHYSICAL JOURNAL LA English DT Article DE ARTIFICIAL SATELLITES, SPACE PROBES; COSMIC MICROWAVE BACKGROUND ID COSMIC-BACKGROUND-EXPLORER; DIFFERENTIAL MICROWAVE RADIOMETERS; SATELLITE; SPECTRUM AB COBE, NASA's first space mission devoted primarily to cosmology, carries three scientific instruments to make precise measurements of the spectrum and anisotropy of the cosmic microwave background radiation on angular scales greater than 7-degrees and to conduct a search for a diffuse cosmic infrared background radiation with 0.7-degrees angular resolution. The mission goal is to make these measurements to the limit imposed by the local astrophysical foregrounds. The COBE instruments cover the wavelength range from 1.2 mum to 1 cm. The instruments are calibrated periodically in orbit using internal calibrators and celestial standards. The observing strategy is designed to minimize and allow determination of systematic errors that could result from spacecraft operations, the local environment of the spacecraft, and emission from foreground astrophysical sources such as the Galaxy and the solar system. The mission orbit and the scanning techniques provide full sky coverage, while simultaneously minimizing solar and terrestrial radiation on the instruments and reducing thermal and radiative perturbations of the measurements. The three instruments are complementary in that combined data from all are needed to discriminate cosmological emissions from other astrophysical sources. Operational experience after launch shows that flight performance generally meets or exceeds the design goals. COBE has now completed 2 years of flight operations, and a third year has been initiated. Initial COBE data products are planned for release in 1993 June. C1 MIT,DEPT PHYS,ROOM 20F-001,CAMBRIDGE,MA 01923. JET PROP LAB,PASADENA,CA 91109. GEN RES CORP,DANVERS,MA 01923. LAWRENCE BERKELEY LAB,SSL,BERKELEY,CA 94720. PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. UNIV CALIF LOS ANGELES,DEPT ASTRON,LOS ANGELES,CA 90024. RP BOGGESS, NW (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771, USA. RI Moseley, Harvey/D-5069-2012 NR 42 TC 200 Z9 201 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 OCT 1 PY 1992 VL 397 IS 2 BP 420 EP 429 DI 10.1086/171797 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JQ075 UT WOS:A1992JQ07500006 ER PT J AU IGLESIAS, CA ROGERS, FJ WILSON, BG AF IGLESIAS, CA ROGERS, FJ WILSON, BG TI SPIN-ORBIT INTERACTION EFFECTS ON THE ROSSELAND MEAN OPACITY SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC DATA; ATOMIC PROCESSES; STARS, INTERIORS ID SOLAR; ABUNDANCE; IRON; PLASMA; LINES AB Recently published opacity tables for astrophysical mixtures using the OPAL code showed significant differences when compared to the commonly used Los Alamos results. An important finding of the OPAL calculations was a large opacity enhancement (approximately factors of 3) in the few hundred-thousand degree temperature range. This new opacity bump is a consequence of improvements in the atomic data generation. Specifically, the configuration term splitting in OPAL was done in the pure LS-coupling approximation which is essentially neglected in the Los Alamos calculations. However, for heavier elements such as Fe, spin-orbit interactions are small but not negligible; consequently, pure LS-coupling breaks down. The main impact of the spin-orbit interaction is to enhance significantly the opacity in the region of the new Z bump (as much as 50%) but only at low densities. New Rosseland mean opacity tables with intermediate coupling for the Fe have been tabulated. Although a metal composition based on recent analysis of solar observations is assumed as standard, opacity tables for mixtures with different relative metal abundances are possible. In addition, the previous tables are extended to lower and higher densities as well as higher metallicity. RP IGLESIAS, CA (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 28 TC 453 Z9 454 U1 1 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 1 PY 1992 VL 397 IS 2 BP 717 EP 728 DI 10.1086/171827 PN 1 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JQ075 UT WOS:A1992JQ07500036 ER PT J AU LEE, IY AF LEE, IY TI COMPARISON OF CLOUD MICROPHYSICS PARAMETERIZATIONS FOR SIMULATION OF MESOSCALE CLOUDS AND PRECIPITATION SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON ATMOSPHERIC SCIENCES AND APPLICATION TO AIR QUALITY CY OCT 15-19, 1990 CL SHANGHAI, PEOPLES R CHINA DE CLOUD MICROPHYSICS; PARAMETERIZATIONS; CLOUD WATER; RAIN WATER; CLOUD ICE; GRAUPEL; SNOWFLAKES ID NUMERICAL-SIMULATION; SIZE DISTRIBUTIONS; MODEL; EVOLUTION; GROWTH; COALESCENCE; COLLECTION; BREAKUP; SPECTRA AB Cloud physics parameterizations are comprehensively reviewed in order to examine their theoretical bases and to evaluate their applicability to mesoscale modeling. The constant distribution functions of hydrometeors assumed in previous work are found to be unrealistic. To circumvent this problem, new parameterizations are developed for mixing ratios of water vapor, cloud water, rain water, cloud ice, graupel and snowflakes. Equations are derived from theoretical considerations and multiple regression applied to results of simulations with a cloud model that incorporates sophisticated treatments of microphysics and dynamics. In a Lagrangian air parcel model under variable atmospheric conditions, the new parameterizations give consistent results and are computationally more efficient than previously available parameterizations. RP LEE, IY (reprint author), ARGONNE NATL LAB,DIV ENVIRONM RES,ARGONNE,IL 60439, USA. NR 37 TC 8 Z9 9 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0004-6981 J9 ATMOS ENVIRON A-GEN PD OCT PY 1992 VL 26 IS 15 BP 2699 EP 2712 DI 10.1016/0960-1686(92)90004-5 PG 14 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA JT894 UT WOS:A1992JT89400004 ER PT J AU CARSON, JE AF CARSON, JE TI ON THE PREPARATION OF ENVIRONMENTAL-IMPACT STATEMENTS IN THE UNITED-STATES-OF-AMERICA SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Article DE ENVIRONMENTAL IMPACT STATEMENTS; NEPA; LICENSING OF NUCLEAR POWER PLANTS AB The National Environmental Policy Act of 1969 (NEPA) requires that an Environmental Impact Statement (EIS) be prepared whenever a federal action is considered that could result in a significant impact on the environment. Such actions include the issuance of construction or operating licenses for nuclear facilities and power plants, hydroelectric dams, or the diversion of water from rivers and lakes. An EIS is usually required if federal funds are involved. The U.S. Environmental Protection Agency and U.S. Council for Environmental Quality have developed guidelines and regulations for the preparation of an EIS. An EIS is not a scientific report. It is a legal document whose primary function is its use by decision-making agencies in approving or not approving the proposed federal action. The EIS is also used to inform the public and other government agencies of the environmental impacts of the proposed facility. The NEPA process allows public input into the decision-making process. An EIS should be short and concise, analytical, conclusory, be written for a non-technical audience, discuss the pros and cons of the proposed facility, and examine the impacts of all alternatives to the proposed action. The EIS should identify all adverse environmental impacts that cannot be avoided. The conclusions reached in the EIS should be clearly stated and supported by discussions and data in the text and by references to show that the agency has made the necessary analyses. The paper discusses the purpose and contents of these documents and the environmental procedures used in the U.S.A., especially as they relate to nuclear power plants. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. NR 7 TC 5 Z9 6 U1 2 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0004-6981 J9 ATMOS ENVIRON A-GEN PD OCT PY 1992 VL 26 IS 15 BP 2759 EP 2768 DI 10.1016/0960-1686(92)90012-A PG 10 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA JT894 UT WOS:A1992JT89400012 ER PT J AU CARHART, RA POLICASTRO, AJ DUNN, WE AF CARHART, RA POLICASTRO, AJ DUNN, WE TI AN IMPROVED METHOD FOR PREDICTING SEASONAL AND ANNUAL SHADOWING FROM COOLING-TOWER PLUMES SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Article DE ELECTRICAL ENERGY GENERATION; PLUME SHADOWING; SOLAR RADIATION AB An improved model developed at Argonne National Laboratory and the University of Illinois (ANL/UI) for predicting long-term shadowing due to cooling tower plumes is presented, and its assumptions are compared with those used in previous models. The model is based on a method for the selection of representative categories of similar plumes developed by Dunn and Policastro (Dunn, 1980, Proc. IAHR Cooling Tower Workshop, San Francisco; Policastro et al., 1984, Report EPRI CS-3403-CCM). At a given site this method reduces,the large number of meteorological data cases in a season or year to a much smaller number (almost-equal-to 35) of representative cases, each of which will have a predicted plume substantially different from the others. Plume predictions for the reduced set of category representative cases are then made with the validated ANL/UI plume model. With category representative plume shape, wind speed, wind direction and sun angles available for each hour, full effects of sun angles for the latitude and longitude of the site to be studied are included. The ANL/UI model yields seasonal and annual isopleths of hours of additional shadowing or of percentage reduction in total and direct solar energy arriving at the ground on a horizontal surface. Results for two hypothetical sites with 500 MWe generating capacity are presented and contrasted, one at Syracuse, NY, and the other at Spokane, WA. C1 ARGONNE NATL LAB,DIV ENVIRONM ASSESSMENT & INFORMAT SCI,ARGONNE,IL 60439. UNIV ILLINOIS,DEPT MECH ENGN,CHAMPAIGN,IL 61820. RP CARHART, RA (reprint author), UNIV ILLINOIS,DEPT PHYS,BOX 4348,CHICAGO,IL 60680, USA. NR 16 TC 3 Z9 7 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0004-6981 J9 ATMOS ENVIRON A-GEN PD OCT PY 1992 VL 26 IS 15 BP 2845 EP 2852 DI 10.1016/0960-1686(92)90022-D PG 8 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA JT894 UT WOS:A1992JT89400020 ER PT J AU HEPP, GR KENNAMER, RA AF HEPP, GR KENNAMER, RA TI CHARACTERISTICS AND CONSEQUENCES OF NEST-SITE FIDELITY IN WOOD DUCKS SO AUK LA English DT Article ID PHILOPATRY; DISPERSAL; FAMILIARITY; POPULATION; BOBOLINKS; TERRITORY; DYNAMICS; BIRDS; MATE AB We used nine years of nesting data from a population of Wood Ducks (Aix sponsa) using nest boxes to test predictions regarding proximate controls of nest-site fidelity and the consequences of returning to the same nest site. Overall, 41.9% of females returned to the same nest box in year t + 1, 37.5% nested in a different box on the same wetland, and 20.5% of females moved to a different wetland to nest. There were no yearly differences in the degree of nest-site fidelity, and females using different wetlands between years travelled a median of two wetlands and moved an average distance of 1.3 km. Females nesting successfully used the same nest box to a greater extent in year t + 1 than females that were not successful. The positive association between nest success and nest-site fidelity also occurred within breeding seasons. Degree of nest-site fidelity exhibited by females was similar within and between breeding seasons. After controlling for variation in nest success, nest-site fidelity of yearlings did not differ from that of adults. Proportion of females returning to the same box in year t + 1 was not correlated with estimated population size of breeding females in that year. Females returning to the same box nested earlier than females using different boxes, but clutch size did not differ. Overall, females nesting in the same box did not have greater nest success in year t + 1, were not more likely to have nests parasitized, and did not survive better to year t + 2 than females nesting in different boxes. However, females that nested unsuccessfully tended to improve nest success by moving to a different nest box. C1 SAVANNAH RIVER ECOL LAB,AIKEN,SC 29801. RP HEPP, GR (reprint author), AUBURN UNIV,ALABAMA AGR EXPT STN,DEPT ZOOL & WILDLIFE SCI,AUBURN,AL 36849, USA. RI Piper, Walter/B-7908-2009 NR 32 TC 35 Z9 37 U1 0 U2 15 PU AMER ORNITHOLOGISTS UNION PI LAWRENCE PA ORNITHOLOGICAL SOC NORTH AMER PO BOX 1897, LAWRENCE, KS 66044-8897 SN 0004-8038 J9 AUK JI AUK PD OCT PY 1992 VL 109 IS 4 BP 812 EP 818 PG 7 WC Ornithology SC Zoology GA KW258 UT WOS:A1992KW25800011 ER PT J AU DIVE, C YOSHIDA, TM SIMPSON, DJ MARRONE, BL AF DIVE, C YOSHIDA, TM SIMPSON, DJ MARRONE, BL TI FLOW CYTOMETRIC ANALYSIS OF STEROIDOGENIC ORGANELLES IN DIFFERENTIATING GRANULOSA-CELLS SO BIOLOGY OF REPRODUCTION LA English DT Article ID FOLLICULAR MATURATION; LUTEINIZING-HORMONE; PROGESTERONE; MICROTUBULES; ADENOSINE; FORSKOLIN AB Functional and structural changes accompany the differentiation of granulosa cells during follicular development. We used flow cytometry and fluorescent dyes to characterize two organelles important to the steroidogenic process. Mitochondria, which contain the rate-limiting enzyme responsible for cholesterol conversion to pregnenolone, and lipid droplets, which store cholesterol substrate, were probed in viable hen granulosa cells during differentiation. The fluorescent dye Dio3-C5 (DiO) was used to probe mitochondrial membrane potential, indicative of mitochondrial activity and/or number, during rapid granulosa cell differentiation in a hierarchy of individual developing hen preovulatory follicles (F6, smallest, to F1, largest). Cellular DiO fluorescence, granularity, and cell size were significantly elevated with increasing maturation state. Treatment with LH significantly increased DiO fluorescence in granulosa cells from F1 but not F3. The increased mitochondrial activity/number in granulosa cells that accompanies follicular maturation and is influenced by LH may reflect, at least in part, increased activity or amount of hormone-regulated mitochondrial enzymes controlling steroidogenesis. Flow spectrofluorometry and the metachromatic lipid dye, nile red, were used to probe lipid droplets in differentiating granulosa cells from F6 to F1. There was a dramatic in the fluorescence component related to lipid droplets with increasing stages of follicular maturation, suggesting recruitment of lipids into droplets during the differentiation of granulosa cells into hormone-responsive steroidogenic cells. The results demonstrate the dynamic nature of the granulosa cell morphology involved in steroidogenesis during follicular development. In addition, we introduce flow cytometry as a new method for the characterization of structural and functional relationships in individual living granulosa cells. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,LS-1,M888,LOS ALAMOS,NM 87545. UNIV MANCHESTER,DEPT PHYSIOL SCI,MANCHESTER M13 9PL,LANCS,ENGLAND. FU NCRR NIH HHS [P41-RR01315]; NICHD NIH HHS [R01-HD22195] NR 23 TC 3 Z9 3 U1 0 U2 1 PU SOC STUDY REPRODUCTION PI MADISON PA 1603 MONROE ST, MADISON, WI 53711-2021 SN 0006-3363 J9 BIOL REPROD JI Biol. Reprod. PD OCT PY 1992 VL 47 IS 4 BP 520 EP 527 DI 10.1095/biolreprod47.4.520 PG 8 WC Reproductive Biology SC Reproductive Biology GA JP923 UT WOS:A1992JP92300004 PM 1391337 ER PT J AU SUTHERLAND, JC EMRICK, A FRANCE, LL MONTELEONE, DC TRUNK, J AF SUTHERLAND, JC EMRICK, A FRANCE, LL MONTELEONE, DC TRUNK, J TI CIRCULAR-DICHROISM USER FACILITY AT THE NATIONAL SYNCHROTRON LIGHT-SOURCE - ESTIMATION OF PROTEIN SECONDARY STRUCTURE SO BIOTECHNIQUES LA English DT Article ID VACUUM ULTRAVIOLET; SPECTROMETER; PREDICTION; CONFORMATION; ABSORPTION; RADIATION; SPECTRA; ACID AB The ultraviolet circular dichroism of a protein can be used to estimate the net fraction of its amino acids in different classes of secondary structure. Recent advances in the accuracy of such calculations have resulted from improved computational techniques, as well as extension of the spectral region analyzed to wavelengths less than 180 nm, a wavelength range beyond the limit of most laboratory-based circular dichroism spectrometers. We describe a spectrometer that uses UV radiation from the National Synchrotron Light Source at the Brookhaven National Laboratory to record circular dichroism spectra of proteins (and other biologically important molecules) in aqueous solution over the optimum wavelength range required for calculation of secondary structures. This instrument is available for use by scientists from academic, commercial and research institutions. RP SUTHERLAND, JC (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. FU NIGMS NIH HHS [GM34662] NR 26 TC 20 Z9 21 U1 0 U2 1 PU EATON PUBLISHING CO PI NATICK PA 154 E. CENTRAL ST, NATICK, MA 01760 SN 0736-6205 J9 BIOTECHNIQUES JI Biotechniques PD OCT PY 1992 VL 13 IS 4 BP 588 EP 590 PG 3 WC Biochemical Research Methods; Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JR498 UT WOS:A1992JR49800026 PM 1476728 ER PT J AU KATZ, A AF KATZ, A TI IS ITER THE WAY SO BULLETIN OF THE ATOMIC SCIENTISTS LA English DT Article RP KATZ, A (reprint author), US DOE,OFF FUS ENERGY,WASHINGTON,DC 20545, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU EDUC FOUNDATION NUCLEAR SCI PI CHICAGO PA 6042 SOUTH KIMBARK, CHICAGO, IL 60637 SN 0096-3402 J9 B ATOM SCI JI Bull. Atom. Scient. PD OCT PY 1992 VL 48 IS 8 BP 8 EP 10 PG 3 WC International Relations; Social Issues SC International Relations; Social Issues GA JP015 UT WOS:A1992JP01500006 ER PT J AU GAINES, L AF GAINES, L TI PRISONERS-DILEMMA - POUNDSTONE,W SO BULLETIN OF THE ATOMIC SCIENTISTS LA English DT Book Review RP GAINES, L (reprint author), ARGONNE NATL LAB,ARM CONTROL PROGRAM,ARGONNE,IL 60439, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU EDUC FOUNDATION NUCLEAR SCI PI CHICAGO PA 6042 SOUTH KIMBARK, CHICAGO, IL 60637 SN 0096-3402 J9 B ATOM SCI JI Bull. Atom. Scient. PD OCT PY 1992 VL 48 IS 8 BP 44 EP 45 PG 2 WC International Relations; Social Issues SC International Relations; Social Issues GA JP015 UT WOS:A1992JP01500016 ER PT J AU CLAASSEN, JP AF CLAASSEN, JP TI THE APPLICATION OF MULTIPLY CONSTRAINED MINIMUM-VARIANCE ADAPTIVE BEAMFORMING TO REGIONAL MONITORING SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Article ID ARRAY AB Broadband operation of small regional seismic arrays suggests the need for beams whose widths are nearly frequency independent and for an adaptive processor capable of suppressing nonstationary noise and interference. It is shown that multiply constrained minimum-variance (MCMV) adaptive beam-forming when trained on signal-and-noise windows can achieve these objectives better than conventional beamforming. This paper presents the theory, implementation, characteristics, and performance of such a beamformer in the context of seismic monitoring for underground nuclear tests. The adaptive beamformer was applied to a large set of Pn arrivals observed on the NORESS array to estimate first- and second-order sample statistics of the array gain as a function of frequency and subarray size. The relative merit of adaptive beamforming was established by comparing the mean gain with that realized by conventional beamforming. These comparative results and other findings showed that the MCMV beamformer can (1) improve average signal-to-noise ratios from 0 to 8.5 dB, (2) better identify and suppress organized components in the noise field, and (3) better suppress interference in comparison to the conventional beamformer. The adaptive beamformer also produced peak narrowband gains on the larger subarrays in the neighborhood of 24 dB for specific evens. When implementational, seismic environmental, and practical aspects are added to the findings, important configurational and operational strategies are identified. The array gain statistics for both the adaptive and conventional beamformers are also useful for modeling the performance of monitoring networks. RP CLAASSEN, JP (reprint author), SANDIA NATL LABS,DIV SEISM VERIFICAT TECHNOL,9236,ALBUQUERQUE,NM 87185, USA. NR 26 TC 4 Z9 4 U1 0 U2 1 PU SEISMOLOGICAL SOC AMER PI EL CERRITO PA PLAZA PROFESSIONAL BLDG, SUITE 201, EL CERRITO, CA 94530 SN 0037-1106 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD OCT PY 1992 VL 82 IS 5 BP 2191 EP 2212 PG 22 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA JW192 UT WOS:A1992JW19200013 ER PT J AU RUPP, B HOLT, JB WONG, J AF RUPP, B HOLT, JB WONG, J TI THE CALCULATION AND ANALYSIS OF THE ADIABATIC TEMPERATURE OF SOLID COMBUSTION REACTIONS SO CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY LA English DT Article AB The adiabatic temperature (T(ad)) presents a key parameter for the understanding of Solid Combustion Synthesis (SCS) reactions. Based on a generalized treatment of the underlying formalism, a microcomputer program for the calculation and analysis of adiabatic temperatures of SCS reactions is introduced, and representative types of SCS reactions are discussed. Examples include reactions with liquid formation and liquid-solid phase equilibria as well as complex combustion systems with additional inert diluents. The program ADIBAT is fully menu driven and provides graphic presentation of the the reaction temperature vs. the heat of reaction, phase equilibria information, and graphic presentation of the T(ad) vs. the diluent concentration. RP RUPP, B (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94551, USA. NR 18 TC 11 Z9 11 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0364-5916 J9 CALPHAD JI Calphad-Comput. Coupling Ph. Diagrams Thermochem. PD OCT-DEC PY 1992 VL 16 IS 4 BP 377 EP 386 DI 10.1016/0364-5916(92)90013-N PG 10 WC Thermodynamics; Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Thermodynamics; Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA JZ797 UT WOS:A1992JZ79700004 ER PT J AU WINEMILLER, KO ROSE, KA AF WINEMILLER, KO ROSE, KA TI PATTERNS OF LIFE-HISTORY DIVERSIFICATION IN NORTH-AMERICAN FISHES - IMPLICATIONS FOR POPULATION REGULATION SO CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES LA English DT Review ID OPTIMAL REPRODUCTIVE EFFORT; MARINE PELAGIC FISH; NATURAL-SELECTION; FLUCTUATING ENVIRONMENTS; ECOLOGICAL STRATEGIES; PARENTAL CARE; LARVAL SIZE; EGG SIZE; EVOLUTION; PARAMETERS AB Interspecific patterns of fish life histories were evaluated in relation to several theoretical models of life-history evolution. Data were gathered for 216 North American fish species (57 families) to explore relationships among variables and to ordinate species. Multivariate tests, performed on freshwater, marine, and combined data matrices, repeatedly identified a gradient associating later-maturing fishes with higher fecundity, small eggs, and few bouts of reproduction during a short spawning season and the opposite suite of traits with small fishes. A second strong gradient indicated positive associations between parental care, egg size, and extended breeding seasons. Phylogeny affected each variable, and some higher taxonomic groupings were associated with particular life-history strategies. High-fecundity characteristics tended to be associated with large species ranges in the marine environment. Age at maturation, adult growth rate, life span, and egg size positively correlated with anadromy. Parental care was inversely correlated with median latitude. A trilateral continuum based on essential trade-offs among three demographic variables predicts many of the correlations among life-history traits. This framework has implications for predicting population responses to diverse natural and anthropogenic disturbances and provides a basis for comparing responses of different species to the same disturbance. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. OI Winemiller, Kirk/0000-0003-0236-5129 NR 108 TC 685 Z9 708 U1 19 U2 201 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0706-652X J9 CAN J FISH AQUAT SCI JI Can. J. Fish. Aquat. Sci. PD OCT PY 1992 VL 49 IS 10 BP 2196 EP 2218 PG 23 WC Fisheries; Marine & Freshwater Biology SC Fisheries; Marine & Freshwater Biology GA JY881 UT WOS:A1992JY88100024 ER PT J AU TONETTI, DA HORIO, M COLLART, FR HUBERMAN, E AF TONETTI, DA HORIO, M COLLART, FR HUBERMAN, E TI PROTEIN KINASE-C-BETA GENE-EXPRESSION IS ASSOCIATED WITH SUSCEPTIBILITY OF HUMAN PROMYELOCYTIC LEUKEMIA-CELLS TO PHORBOL ESTER-INDUCED DIFFERENTIATION SO CELL GROWTH & DIFFERENTIATION LA English DT Article ID MONOCYTIC DIFFERENTIATION; THYMOMA CELLS; JUN; FOS; RESISTANT; INDUCTION; HL-60; DIESTER; FAMILY; TRANSCRIPTION AB To study the signal transduction pathway leading to phorbol 12-myristate 13-acetate (PMA)-induced differentiation in human promyelocytic HL-60 leukemia cells, we examined the expression of protein kinase C (PKC) isozyme genes in HL-60 cells that are susceptible or resistant to PMA-induced differentiation. The PKC-alpha, -beta, -gamma, -delta, -epsilon, and -zeta transcript levels were assessed by Northern blotting, and the PKC-alpha, -beta, and -gamma protein levels were examined by immunoblotting. The PMA-resistant cell variants HL-525 and HL-534 were found to be deficient in the PKC-beta isozyme RNA and protein as compared with the PMA-susceptible HL-60 and HL-205 cell lines. In addition, a "delta-like" PKC RNA species identified in these cells demonstrated a reduced abundance in the HL-525 and HL-534 cells. Southern blot analysis indicated that the observed reduction in PKC-beta gene expression does not appear to be due to a gross deletion or rearrangement of the gene. The expression of the early response genes junB, c-fos, and c-jun was attenuated in PMA-treated HL-525 and HL-534 cells as compared to the PMA-treated HL-60 and HL-205 cells. These results suggest that the signal transduction pathway that leads to PMA-induced differentiation in the HL-60 cell system requires PKC-beta and/or delta-like PKC for the proper expression of the early response genes, and ultimately the expression of genes that define the mature state. C1 ARGONNE NATL LAB,DIV BIOL & MED RES,9700 S CASS AVE,ARGONNE,IL 60439. OI Collart, Frank/0000-0001-6942-4483 NR 36 TC 63 Z9 63 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 1044-9523 J9 CELL GROWTH DIFFER JI Cell Growth Differ. PD OCT PY 1992 VL 3 IS 10 BP 739 EP 745 PG 7 WC Cell Biology SC Cell Biology GA JT391 UT WOS:A1992JT39100010 PM 1445803 ER PT J AU Hoover, WG Moran, B AF Hoover, W. G. Moran, B. TI Viscous attractor for the Galton board SO CHAOS LA English DT Article ID MOLECULAR-DYNAMICS METHODS; PERIODIC LORENTZ GAS; CANONICAL ENSEMBLE; IRREVERSIBILITY; DIFFUSION AB We analyze the Galton Board [or periodic ''Lorentz Gas''] with a point mass scattered by elastic disks of diameter sigma, using a constant driving field g and a constant-viscosity linear drag force -p/tau, where p is the point-mass momentum. This combination leads to a nonequilibrium steady state which depends only upon the dimensionless ratio g tau(2)/sigma. The long-time-averaged trajectory leads to multifractal phase-space structures closely resembling those we found earlier using isokinetic equations of motion derived from Gauss' Principle of Least Constraint. A highly damped [small tau] creeping-flow limit describes our results for g tau(2)/sigma less than about 0.2. The lightly damped Green-Kubo linear-response limit for the model provides an accurate description of the dissipative dynamics for g tau(2)/sigma greater than about 2.0. C1 [Hoover, W. G.] Univ Calif Davis, Dept Appl Sci, Livermore, CA 94550 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Hoover, WG (reprint author), Univ Calif Davis, Dept Appl Sci, Livermore, CA 94550 USA. FU Department of Energy [W-7405-Eng-48] FX Joanne L. Levatin (Earth Sciences Division, LLNL) very kindly provided the software which generated the stereo Fig. 3. In addition to our traditional thanks to the National Science Foundation for generous travel support we would like to thank Brad Holian (LANL) and Aurel Bulgac (Michigan State University) for the discussions that led to this extension of our 1987 work. The referees' comments were particularly helpful. This work was performed, in part, at the Lawrence Livermore National Laboratory under the auspices of the Department of Energy under the provisions of Contract No. W-7405-Eng-48. NR 20 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 1054-1500 EI 1089-7682 J9 CHAOS JI Chaos PD OCT PY 1992 VL 2 IS 4 DI 10.1063/1.165866 PG 4 WC Mathematics, Applied; Physics, Mathematical SC Mathematics; Physics GA V22XQ UT WOS:000208308300012 ER PT J AU Pearson, JE Bruno, WJ AF Pearson, John E. Bruno, William J. TI Pattern formation in an N plus Q component reaction-diffusion system SO CHAOS LA English DT Article AB A general N+Q component reaction-diffusion system is analyzed with regard to pattern forming instabilities (Turing bifurcations). The system consists of N mobile species and Q immobile species. The Q immobile species form in response to reactions between the N mobile species and an immobile substrate and allow the Turing instability to occur. These results are valid both for bifurcations from a spatially uniform state and for systems with an externally imposed gradient as in the experimental systems in which Turing patterns have been observed. It is shown that the critical wave number and the location of the instability in parameter space are independent of the substrate concentration. It is also found that the system necessarily undergoes a Hopf bifurcation as the total substrate concentration is decreased. Further, in the case that all the mobile species diffuse at identical rates we show that if the full system is at a point of Turing bifurcation then the N component mobile subsystem is at transition from an unstable focus to an unstable node, and the critical wave number is simply related to the degenerate positive eigenvalue of the mobile subsystem. A sequence of bifurcations that occur in the eigenspectra as the total substrate concentration is decreased to zero is also discussed. C1 [Pearson, John E.; Bruno, William J.] Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. RP Pearson, JE (reprint author), Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. FU Santa Fe Institute FX J.P. would like to thank Harry Swinney, Qi Ouyang, Zoltan Noszcticius, and Ray Kapral for useful discussions. W.J.B. would like to thank the Santa Fe Institute for support. J.P. would also like to thank D. Campbell, G. Doolen, and B. Hasslacher for encouraging this work. NR 26 TC 12 Z9 12 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 1054-1500 J9 CHAOS JI Chaos PD OCT PY 1992 VL 2 IS 4 DI 10.1063/1.165893 PG 12 WC Mathematics, Applied; Physics, Mathematical SC Mathematics; Physics GA V22XQ UT WOS:000208308300005 ER PT J AU CARLSON, RJ AF CARLSON, RJ TI THE ORIGIN OF EXTRA RESONANCES IN SATURATED, FULLY RESONANT, MOLECULAR SPECTROSCOPIES SO CHEMICAL PHYSICS LA English DT Article ID DIFFERENCE FREQUENCY GENERATION; COHERENT RAMAN-SCATTERING; LINE-NARROWING PROPERTIES; STRONG LIGHT FIELDS; THEORETICAL-ANALYSIS; EXCITATION PROFILE; TRANSITIONS; LINESHAPES; ABSORPTION; STATE AB It is shown that, under conditions appropriate for the electronic/vibrational manifold of molecules, destructive interference between population and fully coherent terms of the steady-state nonlinear susceptibility persists for laser intensities substantially exceeding the usual saturation limit, leading to the absence of extra resonances in the limit of no pure dephasing over a wide intensity range. Unrelaxed (Raman/fluorescence) emission and coherent anti-Stokes Raman scattering (CARS) are treated in detail as examples. Dephasing induced resonances are absent for both spectroscopies in the no pure dephasing limit provided the Rabi frequency is significantly less than the vibrational (rather than electronic) dephasing rate. For inhomogeneously broadened media, these interference effects alter the line-narrowing properties of both spectroscopies. For unrelaxed emission, no line-narrowed, fluorescence-like resonance occurs. For CARS, only a single, saturation induced, line-narrowed resonance corresponding to a vibronic level of the electronically excited state is predicted - no line-narrowed vibrational resonance appears. C1 LOS ALAMOS NATL LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545. NR 29 TC 0 Z9 0 U1 1 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 OCT 1 PY 1992 VL 166 IS 1-2 BP 177 EP 192 DI 10.1016/0301-0104(92)87017-4 PG 16 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JQ463 UT WOS:A1992JQ46300017 ER PT J AU YOO, RK RUSCIC, B BERKOWITZ, J AF YOO, RK RUSCIC, B BERKOWITZ, J TI 3 LAWS FOR D0(BIF) SO CHEMICAL PHYSICS LA English DT Article ID PHOTOELECTRON-SPECTRA; BISMUTH MONOFLUORIDE; STATES; BIF; SPECTROSCOPY; HALIDES; SYSTEM; SERIES AB Photoion yield curves are presented for BiF and BiF2, generated by vaporizing a Bi-BiF3 mixture. The adiabatic ionization potentials are 8.658 +/- 0.012 eV for BiF, 8.05 +/- 0.05 eV for BiF2. The threshold for formation of Bi+ from BiF occurs at 11.12(6) +/- 0.05 eV, from which one deduces D0(BiF) less-than-or-equal-to 3.84 +/- 0.05 eV. The equilibrium reaction, 2Bi(g) + BiF3(g) --> 3BiF(g), is examined by a second law and a third law treatment. From the second law, D0(BiF) = 3.76 +/- 0.13 eV, and from the third law, D0(BiF) = 3.76 +/- 0.13 eV, the latter error estimate allowing for uncertainty in the relative photoionization cross sections. The present results differ substantially from recent inferences placing D0(BiF) near 5 eV, and others which hover around 3 eV. From an analysis of the equilibrium reaction, Bi(g) + BiF2(g) --> 2BiF(g), it is concluded that D0(FBi-F) = 3.50 +/- 0.15 eV, and D0(F2Bi-F) = 4.5(1) +/- 0.2 eV. C1 ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. RI Ruscic, Branko/A-8716-2008 OI Ruscic, Branko/0000-0002-4372-6990 NR 51 TC 16 Z9 16 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 EI 1873-4421 J9 CHEM PHYS JI Chem. Phys. PD OCT 1 PY 1992 VL 166 IS 1-2 BP 215 EP 227 DI 10.1016/0301-0104(92)87020-A PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JQ463 UT WOS:A1992JQ46300020 ER PT J AU LEUNG, TC HARMON, BN FEDRO, AJ ZHOU, Y SINHA, SK AF LEUNG, TC HARMON, BN FEDRO, AJ ZHOU, Y SINHA, SK TI ELECTRONIC AND MAGNETIC-PROPERTIES OF CUO2 PLANE SO CHINESE JOURNAL OF PHYSICS LA English DT Article; Proceedings Paper CT 8TH ROC - ROK SYMP ON CONDENSED MATTER AND STATISTICAL PHYSICS CY FEB 14-15, 1992 CL NATL TAIWAN NORMAL UNIV, TAIPEI, TAIWAN SP NATL SCI COUNCIL REPUBLIC CHINA HO NATL TAIWAN NORMAL UNIV ID HIGH-TC SUPERCONDUCTORS; 3-BAND HUBBARD-MODEL; SPIN-FLUID STATE; INTERACTION PARAMETERS; LA2CUO4; LA2-XSRXCUO4 AB A mean field calculation of the two dimensioinal three band Hubbard models based on a Mori-projection operator formalism, which is called the projection operator mean field (POMF) approximation, is presented. The results are compared with those of the Quantum Monte Carlo (QMC) simulations. We find that the POMF results agree very well with those of the QMC. Then we use the parameters determined by the constrained density functional method to study the CuO2 plane by POMF. We find an antiferromagnetic insulating ground state with band gap and magnetic moment given by 1.97 eV and 0.65 mu(B), and a satellite peak around 13 eV below Fermi level. All these results agree with experiment. The effect of doping on the solutions is discussed. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. ARGONNE NATL LAB,ARGONNE,IL 60439. EXXON RES & ENGN CO,CORP RES,ANNANDALE,NJ 08801. RP LEUNG, TC (reprint author), NATL CHUNG CHENG UNIV,INST PHYS,CHIAYI 621,TAIWAN. NR 28 TC 1 Z9 1 U1 0 U2 2 PU PHYSICAL SOC REPUBLIC CHINA PI TAIPEI PA CHINESE JOURNAL PHYSICS PO BOX 23-30, TAIPEI 10764, TAIWAN SN 0577-9073 J9 CHINESE J PHYS JI Chin. J. Phys. PD OCT PY 1992 VL 30 IS 5 BP 723 EP 735 PG 13 WC Physics, Multidisciplinary SC Physics GA JT558 UT WOS:A1992JT55800011 ER PT J AU KRAUSS, RM MILLER, BD FAIR, JM HASKELL, WL ALDERMAN, EL AF KRAUSS, RM MILLER, BD FAIR, JM HASKELL, WL ALDERMAN, EL TI REDUCED PROGRESSION OF CORONARY-ARTERY DISEASE WITH RISK FACTOR INTERVENTION IN PATIENTS WITH LDL SUBCLASS PATTERN-B SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. STANFORD UNIV,STANFORD,CA 94305. NR 0 TC 10 Z9 10 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1992 VL 86 IS 4 SU S BP 63 EP 63 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA JT660 UT WOS:A1992JT66000280 ER PT J AU REAVEN, GM CHEN, YDI KRAUSS, RM AF REAVEN, GM CHEN, YDI KRAUSS, RM TI RESISTANCE TO INSULIN-MEDIATED GLUCOSE-UPTAKE AND HYPERINSULINEMIA IN SUBJECTS WITH SMALL, DENSE LDL SO CIRCULATION LA English DT Meeting Abstract C1 STANFORD UNIV,STANFORD,CA 94305. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 2 Z9 2 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1992 VL 86 IS 4 SU S BP 73 EP 73 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA JT660 UT WOS:A1992JT66000320 ER PT J AU TRIBBLE, DL VANDENBERG, J MOTCHNIK, PA AMES, BN LEWIS, DM CHAIT, A KRAUSS, RM AF TRIBBLE, DL VANDENBERG, J MOTCHNIK, PA AMES, BN LEWIS, DM CHAIT, A KRAUSS, RM TI OXIDATIVE SUSCEPTIBILITY OF A SURFACE FATTY-ACID PROBE IS RELATED TO LDL UBIQUINOL CONTENT SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. CHILDRENS HOSP OAKLAND RES INST,OAKLAND,CA. UNIV WASHINGTON,SEATTLE,WA 98195. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1992 VL 86 IS 4 SU S BP 210 EP 210 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA JT660 UT WOS:A1992JT66000864 ER PT J AU TRIBBLE, DL MOTCHNIK, PA CHAIT, A AMES, BN LEWIS, DM KUNNEN, M KRAUSS, RM AF TRIBBLE, DL MOTCHNIK, PA CHAIT, A AMES, BN LEWIS, DM KUNNEN, M KRAUSS, RM TI REDUCED ANTIOXIDANT CONTENT OF INTERMEDIATE DENSITY LIPOPROTEINS (IDL) IN LDL SUBCLASS PATTERN-B SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV WASHINGTON,SEATTLE,WA 98195. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1992 VL 86 IS 4 SU S BP 212 EP 212 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA JT660 UT WOS:A1992JT66000866 ER PT J AU GONG, EL SHOUKRY, MI TAN, CS RUBIN, EM NICHOLS, AV AF GONG, EL SHOUKRY, MI TAN, CS RUBIN, EM NICHOLS, AV TI DIFFERENTIAL LIPID-BINDING PROPERTIES OF MOUSE VS HUMAN AI SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1992 VL 86 IS 4 SU S BP 279 EP 279 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA JT660 UT WOS:A1992JT66001135 ER PT J AU MORTIMER, BC SPANGLER, EA REDGRAVE, TG RUBIN, EM AF MORTIMER, BC SPANGLER, EA REDGRAVE, TG RUBIN, EM TI INCREASED APOLIPOPROTEIN-E ACCELERATES CLEARANCE OF CHYLOMICRON-LIKE LIPID EMULSIONS IN TRANSGENIC MICE SO CIRCULATION LA English DT Meeting Abstract C1 UNIV WESTERN AUSTRALIA,NEDLANDS,WA 6009,AUSTRALIA. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1992 VL 86 IS 4 SU S BP 279 EP 279 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA JT660 UT WOS:A1992JT66001134 ER PT J AU SUPERKO, HR KRAUSS, RM AF SUPERKO, HR KRAUSS, RM TI DIFFERENTIAL-EFFECTS OF DIETARY FIBER ON LDL PARTICLE-SIZE IN LDL SUBCLASS PATTERN-A AND PATTERN-B SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1992 VL 86 IS 4 SU S BP 403 EP 403 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA JT660 UT WOS:A1992JT66001630 ER PT J AU DREON, DM KRAUSS, RM AF DREON, DM KRAUSS, RM TI LIPOPROTEIN RESPONSE TO LOW-FAT DIETS IN WOMEN IS RELATED TO PARENTAL LOW-DENSITY-LIPOPROTEIN SUBCLASS PHENOTYPES SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1992 VL 86 IS 4 SU S BP 405 EP 405 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA JT660 UT WOS:A1992JT66001635 ER PT J AU DREON, DM KRAUSS, RM AF DREON, DM KRAUSS, RM TI APOLIPOPROTEIN-E ISOFORM PHENOTYPES ARE ASSOCIATED WITH DIFFERING LDL-SUBCLASS RESPONSES TO REDUCED-FAT DIETS SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1992 VL 86 IS 4 SU S BP 406 EP 406 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA JT660 UT WOS:A1992JT66001639 ER PT J AU SCHULTZ, JR VERSTUYFT, JG GONG, EL NICHOLS, AV RUBIN, EM AF SCHULTZ, JR VERSTUYFT, JG GONG, EL NICHOLS, AV RUBIN, EM TI APOAI AND APOAI+APOAII TRANSGENIC MICE - A COMPARISON OF ATHEROSCLEROTIC SUSCEPTIBILITY SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 5 Z9 5 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1992 VL 86 IS 4 SU S BP 472 EP 472 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA JT660 UT WOS:A1992JT66001896 ER PT J AU BU, XD KRAUSS, RM DEMEESTER, C LOPEZ, R DANESHMA, S PUPPIONE, D GRAY, R LUSIS, AJ ROTTER, JI AF BU, XD KRAUSS, RM DEMEESTER, C LOPEZ, R DANESHMA, S PUPPIONE, D GRAY, R LUSIS, AJ ROTTER, JI TI MULTIGENIC CONTROL OF LDL PARTICLE-SIZE IN 24 CORONARY-ARTERY DISEASE (CAD) PEDIGREES SO CIRCULATION LA English DT Meeting Abstract C1 CEDARS SINAI MED CTR,LOS ANGELES,CA 90048. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 3 Z9 3 U1 0 U2 1 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1992 VL 86 IS 4 SU S BP 552 EP 552 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA JT660 UT WOS:A1992JT66002217 ER PT J AU WILLIAMS, PT VRAMZAN, KM AF WILLIAMS, PT VRAMZAN, KM TI EFFECTS OF AGE AND ADIPOSITY ON HIGH-DENSITY-LIPOPROTEIN SUBCLASSES BASED ON GRADIENT GEL-ELECTROPHORESIS SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1992 VL 86 IS 4 SU S BP 599 EP 599 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA JT660 UT WOS:A1992JT66002406 ER PT J AU MILLER, JA MELIUS, CF AF MILLER, JA MELIUS, CF TI KINETIC AND THERMODYNAMIC ISSUES IN THE FORMATION OF AROMATIC-COMPOUNDS IN FLAMES OF ALIPHATIC FUELS SO COMBUSTION AND FLAME LA English DT Article ID THERMAL-DECOMPOSITION; SHOCK-TUBE; OXYGEN; ISOMERIZATION; MECHANISMS; CHEMISTRY; ALLENE; SOOT AB We have formulated a chemical kinetic model to predict the growth of higher hydrocarbons in a lightly sooting C2H2/O2/Ar flame. The predictions of the model compare favorably with the experimental results of Bastin et al. (Twenty-Second Combustion Symposium). Analysis of the mechanism shows that reactions of (CH2)-C-1 play a central role in forming the C3 and C4 hydrocarbons that ultimately lead to ring formation. Several possibilities are considered for the cyclization reaction. The most likely candidates involve reaction complexes in which the hydrogen atoms are not optimally placed. This point is discussed in some detail. We argue that the "first ring" is most likely formed by reaction of two propargyl radicals, C3H3 + C3H3 double-line arrow pointing left and right C6H5 + H or C3H3 + C3H3 double-line arrow pointing left and right C6H6. RP MILLER, JA (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. NR 44 TC 611 Z9 620 U1 9 U2 63 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0010-2180 J9 COMBUST FLAME JI Combust. Flame PD OCT PY 1992 VL 91 IS 1 BP 21 EP 39 DI 10.1016/0010-2180(92)90124-8 PG 19 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA JN330 UT WOS:A1992JN33000002 ER PT J AU CHAU, LL SHAW, JC YEN, HC AF CHAU, LL SHAW, JC YEN, HC TI SOLVING THE KP HIERARCHY BY GAUGE TRANSFORMATIONS SO COMMUNICATIONS IN MATHEMATICAL PHYSICS LA English DT Article ID KADOMTSEV-PETVIASHVILI EQUATION; N-SOLITON SOLUTIONS; KORTEWEG-DEVRIES; REPRESENTATION AB We show that it is convenient to use "gauge" transformations (sometimes called explicit Backlund transformations) to generate new solutions for the KP hierarchy. Two particular kinds of gauge transformation operators, constructed out of the initial wave functions, are of fundamental importance in this approach. Through such gauge transformations, a very simple formula for the tau-function is obtained, encompassing and unifying all kinds of existing solutions. The corresponding free fermion representation and Baker functions for the new tau function can also be constructed. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NATL CHIAO TUNG UNIV,DEPT APPL MATH,HSINCHU,TAIWAN. NATL TSING HUA UNIV,DEPT PHYS,HSINCHU 300,TAIWAN. RP CHAU, LL (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. NR 22 TC 40 Z9 45 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0010-3616 J9 COMMUN MATH PHYS JI Commun. Math. Phys. PD OCT PY 1992 VL 149 IS 2 BP 263 EP 278 DI 10.1007/BF02097625 PG 16 WC Physics, Mathematical SC Physics GA JT566 UT WOS:A1992JT56600003 ER PT J AU COOPER, WA HIRSHMAN, SP MERAZZI, S GRUBER, R AF COOPER, WA HIRSHMAN, SP MERAZZI, S GRUBER, R TI 3D MAGNETOHYDRODYNAMIC EQUILIBRIA WITH ANISOTROPIC PRESSURE SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article ID MHD EQUILIBRIUM; MOMENT METHOD; CODE; CONFINEMENT; STELLARATOR; SYSTEMS; PLASMA AB An energy functional given by W = integral integral integral d3x[B2/(2mu0) + p(parallel-to)/(GAMMA - 1)] is proposed as a variational principle to determine three-dimensional (3D) magnetohydrodynamic (MHD) equilibria with anisotropic plasma pressure. It is demonstrated that the minimisation of W using an inverse coordinate spectral method reproduces the force balance relations that govern the MHD equilibrium properties of 3D plasmas with p(parallel-to) not-equal p(parpendicular-to) that have nested magnetic flux surfaces. Numerical procedures already developed for the scalar pressure model can be easily extended to the anisotropic pressure model. Specifically, a steepest descent procedure coupled with the application of a preconditioning algorithm to improve the convergence behaviour has been employed to minimise the energy of the system. The numerical generation of 3D torsatron equilibria with highly localised anisotropic pressure distributions attests to the robustness of the method of solution considered. C1 OAK RIDGE NATL LAB,DIV FUS ENERGY,OAK RIDGE,TN. ECOLE POLYTECH FED LAUSANNE,INST MACHINES HYDRAUL & MECAN FLUIDES,CH-1007 LAUSANNE,SWITZERLAND. CTR SVIZZERO CALCOLO SCI,APPL SCI SVIZZERA GRP,MANNO,SWITZERLAND. RP COOPER, WA (reprint author), ECOLE POLYTECH FED LAUSANNE,ASSOC EURATOM CONFEDERAT SUISSE,CTR RECH PHYS PLASMAS,21 AVE BAINS,CH-1007 LAUSANNE,SWITZERLAND. NR 23 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 OCT PY 1992 VL 72 IS 1 BP 1 EP 13 DI 10.1016/0010-4655(92)90002-G PG 13 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA JV949 UT WOS:A1992JV94900001 ER PT J AU WEBER, CF BEAHM, EC WATSON, JS AF WEBER, CF BEAHM, EC WATSON, JS TI OPTIMAL DETERMINATION OF RATE COEFFICIENTS IN MULTIPLE-REACTION SYSTEMS SO COMPUTERS & CHEMISTRY LA English DT Article ID CHEMICAL-KINETICS AB An efficient methodology is developed for parameter estimation and is applied by fitting 6 unknown rate coefficients. The estimation procedure is generally applicable to any system, although development has currently been limited to first-order systems of ordinary differential equations (ODE), such as those describing multiple chemical reactions. The objective is to find parameter values so as to minimize the sum of squared error (SSE), where each error term is the difference between the calculated system solution at a point and a selected data value. Since the calculated solution is generally quite nonlinear, an iterative solution is required. At each iteration, parameter values are supplied, the system is solved, and the SSE is determined. In addition, efficient algorithms require the SSE gradient (with respect to the vector of unknown parameters) in order to provide updated parameter estimates. Using conventional techniques, determination of this gradient involves solution of an ODE system for each parameter to be estimated. If more than a few parameters are involved, the cost could be prohibitive. However, a procedure using adjoint operators is developed in which the SSE gradient can be calculated by solving only one additional ODE system, regardless of the number of parameters being optimized. Combined with a quasi-Newton updating system, an efficient methodology results. This methodology has been applied to a set of six chemical reactions describing the aqueous speciation (hydrolysis) of iodine. C1 UNIV TENNESSEE,KNOXVILLE,TN 37922. RP WEBER, CF (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 19 TC 3 Z9 3 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0097-8485 J9 COMPUT CHEM JI Comput. Chem. PD OCT PY 1992 VL 16 IS 4 BP 325 EP 333 DI 10.1016/0097-8485(92)80053-3 PG 9 WC Chemistry, Multidisciplinary; Computer Science, Interdisciplinary Applications SC Chemistry; Computer Science GA KE947 UT WOS:A1992KE94700008 ER PT J AU CRAWFORD, KA EYADA, OK AF CRAWFORD, KA EYADA, OK TI A KNOWLEDGE-BASED DECISION SUPPORT TOOL TO INCREASE THE EFFECTIVENESS OF PURCHASED MATERIAL QUALITY VERIFICATIONS SO COMPUTERS & INDUSTRIAL ENGINEERING LA English DT Article AB In response to the worldwide proliferation of fraudulent materials, a prototype knowledge-based decision support tool has been developed to increase the effectiveness of incoming purchased material quality verifications. Traditional quality verification practices, especially those used in government regulated industries, are ineffective against poor quality materials that appear to be authentic. Safety considerations abound as these highly defective materials are used in systems that are critical to public safety. Quality assurance programs in several instances have failed to stop the influx of fraudulent materials. In many cases only physical inspections and tests can guard against defective purchased materials. Unfortunately, it is impractical and cost ineffective for most organizations to inspect all purchased materials. This paper describes how knowledge engineering techniques can be applied to assist in solving this problem. By formulating commonly available and diverse industry information, a knowledge based system becomes a tool that allows users to focus quality verification efforts on highly suspect materials. C1 VIRGINIA POLYTECH INST & STATE UNIV,DEPT IND & SYST ENGN,BLACKSBURG,VA 24061. RP CRAWFORD, KA (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER LAB,AIKEN,SC 29802, USA. NR 7 TC 1 Z9 1 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-8352 J9 COMPUT IND ENG JI Comput. Ind. Eng. PD OCT PY 1992 VL 22 IS 4 BP 415 EP 421 DI 10.1016/0360-8352(92)90017-E PG 7 WC Computer Science, Interdisciplinary Applications; Engineering, Industrial SC Computer Science; Engineering GA JV105 UT WOS:A1992JV10500006 ER PT J AU SUN, XH KAMEL, NN AF SUN, XH KAMEL, NN TI AUGMENTING MULTIKEY SEARCHING STRUCTURE FOR GENERAL DATABASE QUERIES SO COMPUTING SYSTEMS LA English DT Article DE MULTIKEY SEARCHING; DATABASE QUERIES; RANGE SEARCHING AB In the last two decades, various data structures and methods have been proposed for range searching, but few studies have been done on data structures for general multikey queries. In this paper the use of range searching data structures for general multikey PROJECT-SELECT-JOIN queries is studied. A dynamic query range concept is introduced as a means of performing range searches in kd-trees when the search range contain multi-variable comparisons. A full implementation is described, and test results are presented. Thus, through searching on the dynamic query ranges, the general PROJECT-SELECT-JOIN query implementation is facilitated in large databases. C1 UNIV FLORIDA,DEPT COMP & INFORMAT SCI,CTR DATABASE SYST RES & DEV,GAINESVILLE,FL 32608. US DOE,AMES LAB,AMES,IA 50010. NR 13 TC 0 Z9 0 U1 0 U2 0 PU C R L PUBLISHING LTD PI MARKET HARBOROUGH PA PO BOX 31, MARKET HARBOROUGH, LEICS, ENGLAND LE16 9RQ SN 0267-6192 J9 COMPUT SYST SCI ENG JI Comput. Syst. Sci. Eng. PD OCT PY 1992 VL 7 IS 4 BP 229 EP 235 PG 7 WC Computer Science, Hardware & Architecture; Computer Science, Theory & Methods SC Computer Science GA JV204 UT WOS:A1992JV20400003 ER PT J AU WALKER, DW WORLEY, PH DRAKE, JB AF WALKER, DW WORLEY, PH DRAKE, JB TI PARALLELIZING THE SPECTRAL TRANSFORM METHOD .2. SO CONCURRENCY-PRACTICE AND EXPERIENCE LA English DT Article AB The spectral transform method is a widely used numerical technique for solving partial differential equations on the sphere in global climate modeling. This paper describes the parallelization and performance of the spectral method for solving the non-linear shallow water equations on the surface of a sphere using a 128-node Intel iPSC/860 hypercube. Solving the shallow water equations represents a computational kernel of more complex climate models. This work is part of a research program to develop climate models that are capable of much longer simulations at a significantly finer resolution than current models. Such models are important in understanding the effects of the increasing atmospheric concentrations of greenhouse gases, and the computational requirements are so large that massively parallel multiprocessors will be necessary to run climate model simulations in a reasonable amount of time. The spectral method involves the transformation of data between the physical, Fourier and spectral domains. Each of these domains is two-dimensional. The spectral method performs Fourier transforms in the longitude direction followed by summation in the latitude direction to evaluate the discrete spectral transform. A simple way of parallelizing the spectral code is to decompose the physical problem domain in just the latitude direction. This allows an optimized sequential FFT algorithm to be used in the longitude direction. However, this approach limits the number of processors that can be brought to bear on the problem. Decomposing the problem over both directions allows the parallelism inherent in the problem to be exploited more effectively-the grain size is reduced, so that more processors can be used. Results are presented that show that decomposing over both directions does result in a more rapid solution of the problem. The results show that, for a given problem and number of processors, the optimum decomposition has approximately equal numbers of processors in each direction. Load imbalance also has an impact on the performance of the method. The importance of minimizing communication latency and overlapping communication with calculation is stressed. General methods for doing this, that may be applied to many other problems, are discussed. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RI Walker, David/B-7978-2010 NR 11 TC 8 Z9 8 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 1040-3108 J9 CONCURRENCY-PRACT EX JI Concurrency-Pract. Exp. PD OCT PY 1992 VL 4 IS 7 BP 509 EP 531 DI 10.1002/cpe.4330040703 PG 23 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA JU764 UT WOS:A1992JU76400002 ER PT J AU WELLER, RE DAGLE, GE PERRY, RL PARK, JF AF WELLER, RE DAGLE, GE PERRY, RL PARK, JF TI PRIMARY PULMONARY CHONDROSARCOMA IN A DOG SO CORNELL VETERINARIAN LA English DT Article DE CHONDROSARCOMA; DOG; EXTRASKELETAL ID TUMORS; LUNG AB Extraosseous chondrosarcomas are uncommon in the dog, and those originating in the lung are rare. This report presents a 9-year-old Beagle dog with a pulmonary mass which caused depression, fever, tachypnea, cough, and laboratory abnormalities. The mass was composed predominately of chondroid tissue, and was histologically diagnosed as chondrosarcoma. C1 MICHIGAN STATE UNIV, DEPT SMALL ANIM CLIN SCI, E LANSING, MI 48824 USA. RP WELLER, RE (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 15 TC 7 Z9 7 U1 0 U2 1 PU CORNELL VETERINARIAN INC PI ITHACA PA CORNELL UNIV, ITHACA, NY 14853 SN 0010-8901 J9 CORNELL VET PD OCT PY 1992 VL 82 IS 4 BP 447 EP 452 PG 6 WC Veterinary Sciences SC Veterinary Sciences GA JR053 UT WOS:A1992JR05300012 PM 1424637 ER PT J AU VINE, EL AF VINE, EL TI FREE RIDER ESTIMATION - REFINING THE USE OF SURVEYS SO ENERGY LA English DT Article AB The accurate measurement of free ridership is a significant issue for evaluators and program managers of demand-side management programs. The use of survey questionnaires will continue to be a cost-effective, although limited, approach in determining the level of free ridership. The use of innovative questionnaire designs and questions will enable researchers to reduce the level of uncertainty regarding free ridership. We examine the issue of free ridership through the use of multiple questions and through sectoral analysis. RP VINE, EL (reprint author), LAWRENCE BERKELEY LAB,ENERGY ANAL PROGRAM,BERKELEY,CA 94720, USA. NR 5 TC 2 Z9 2 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-5442 J9 ENERGY JI Energy PD OCT PY 1992 VL 17 IS 10 BP 919 EP 925 DI 10.1016/0360-5442(92)90040-7 PG 7 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA JN351 UT WOS:A1992JN35100004 ER PT J AU MCLARTY, L REED, MJ AF MCLARTY, L REED, MJ TI THE UNITED-STATES GEOTHERMAL INDUSTRY - 3 DECADES OF GROWTH SO ENERGY SOURCES LA English DT Article DE DRY STEAM; GEOTHERMAL; WATER-DOMINATED AB Over the last three decades the U.S. geothermal power-generation industry has grown to be the largest in the world, with over 2700 MW of installed electrical capacity. Growth during the first two decades (1960-1980) was characterized by a single utility's development of one dry-steam resource. After 1983, growth shifted toward independent power producers, and development of water-dominated geothermal resources at several locations. In the absence of significant changes in demand, incentives, or the regulatory process, new geothermal generating capacity, through 1995, will probably not exceed 500 MW. The U.S. geothermal industry must increase its inventory of characterized geothermal reservoirs in order to meet the expected demand for rapid geothermal development before the year 2000. C1 US DOE,WASHINGTON,DC. RP MCLARTY, L (reprint author), MERIDIAN CORP,ALEXANDRIA,VA, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0090-8312 J9 ENERG SOURCE JI Energy Sources PD OCT-DEC PY 1992 VL 14 IS 4 BP 443 EP 455 DI 10.1080/00908319208908739 PG 13 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA JP261 UT WOS:A1992JP26100009 ER PT J AU WULLSCHLEGER, SD HANSON, PJ GUNDERSON, CA AF WULLSCHLEGER, SD HANSON, PJ GUNDERSON, CA TI ASSESSING THE INFLUENCE OF EXOGENOUS ETHYLENE ON ELECTRON-TRANSPORT AND FLUORESCENCE QUENCHING IN LEAVES OF GLYCINE-MAX SO ENVIRONMENTAL AND EXPERIMENTAL BOTANY LA English DT Article ID FOLIAR GAS-EXCHANGE; CARBON ASSIMILATION; RIBULOSE-1,5-BISPHOSPHATE CARBOXYLASE; CHLOROPHYLL FLUORESCENCE; LIGHT ENERGY; PHOTOSYNTHESIS; INHIBITION; DISSIPATION; PLANTS; MODEL AB We conducted a series of modeling exercises designed to re-evaluate the light-response and CO2-response curves of TAYLOR and GUNDERSON (Pl. Physiol. 86, 85-92, 1988) and to examine further their conclusion that ethylene-induced inhibition of electron transport may contribute to reduced CO2 assimilation in leaves of Glycine max. By partitioning the response of CO2 assimilation to either electron transport-limited or Rubisco-limited rates of carboxylation, we calculated that the electron transport capacity (J(max)) of ethylene-treated leaves decreased by over 30% following a 4-hr exposure to 10 mul/l ethylene and noted that ethylene-induced reductions in CO2 assimilation could be explained without a decrease in Rubisco activity (Vc(max). Measurements of in vivo Chl fluorescence supported these observations and indicated that the efficiency by which excitation energy was captured in PSII (i.e. (F(m) - F(o))/F(m)) was reduced from 0.80 to 0.73 after a 4-hr exposure to 10 mul/l ethylene. This reduction was also accompanied by a 12% decrease in steady-state photochemical quenching (q(P)), indicating that a lower proportion of open or oxidized PSII reaction centers were participating in light-dependent processes. Effects of ethylene on Chl fluorescence were amplified at increased irradiance, suggesting that photoinhibition may play a role in the ethylene-induced inhibition of CO2 assimilation. RP WULLSCHLEGER, SD (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Hanson, Paul J./D-8069-2011; Wullschleger, Stan/B-8297-2012 OI Hanson, Paul J./0000-0001-7293-3561; Wullschleger, Stan/0000-0002-9869-0446 NR 25 TC 2 Z9 2 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0098-8472 J9 ENVIRON EXP BOT JI Environ. Exp. Bot. PD OCT PY 1992 VL 32 IS 4 BP 449 EP 455 DI 10.1016/0098-8472(92)90057-9 PG 7 WC Plant Sciences; Environmental Sciences SC Plant Sciences; Environmental Sciences & Ecology GA KE145 UT WOS:A1992KE14500015 ER PT J AU TRAVIS, CC MACINNIS, JM AF TRAVIS, CC MACINNIS, JM TI VAPOR EXTRACTION OF ORGANICS FROM SUBSURFACE SOILS - IS IT EFFECTIVE SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID SLOWLY REVERSIBLE SORPTION; ALIPHATIC HALOCARBONS; 1,2-DIBROMOETHANE RP TRAVIS, CC (reprint author), OAK RIDGE NATL LAB,CTR RISK MANAGEMENT,OAK RIDGE,TN, USA. NR 16 TC 25 Z9 29 U1 0 U2 1 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 OCT PY 1992 VL 26 IS 10 BP 1885 EP 1887 DI 10.1021/es00034a003 PG 3 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA JR074 UT WOS:A1992JR07400008 ER PT J AU TARDIF, SD CARSON, RL GANGAWARE, BL AF TARDIF, SD CARSON, RL GANGAWARE, BL TI INFANT-CARE BEHAVIOR OF NONREPRODUCTIVE HELPERS IN A COMMUNAL-CARE PRIMATE, THE COTTON-TOP TAMARIN (SAGUINUS-OEDIPUS) SO ETHOLOGY LA English DT Article ID MARMOSET CALLITHRIX-JACCHUS; COMMON MARMOSET; PARENTAL BEHAVIOR; FUSCICOLLIS; MONKEYS; SYSTEM AB Infant-care behavior patterns of captive cotton-top tamarins were examined to assess factors defining participation by non-reproductive helpers. The time spent carrying infants and characteristics of infant transfers were examined for 47 helpers in a total of 18 groups. We predicted that age, previous experience, and carrying opportunity would all affect participation of non-reproductive helpers. Our results confirm that carrying by non-reproductive helpers was related to age, with older helpers carrying more often. However, this difference declined with increasing infant age, suggesting that body size of the carrier was not the only factor determining participation in carrying. When observations were classified relative to type of interaction with infants, older juveniles were found to both investigate and harass infants more often than subadults or younger juveniles. There was no effect of gender on carrying. The carrying behavior of subadults was not affected by their previous experience; that is, subadults with no previous exposure to infants carried as often as those with previous experience. Inter-individual variation among helpers was high; within 11 twin litters of helpers, one animal usually carried significantly more than the other. C1 OAK RIDGE ASSOCIATED UNIV,MARMOSET RES CTR,OAK RIDGE,TN 37830. NR 40 TC 27 Z9 28 U1 0 U2 3 PU BLACKWELL WISSENSCHAFTS-VERLAG GMBH PI BERLIN PA KURFURSTENDAMM 57, D-10707 BERLIN, GERMANY SN 0179-1613 J9 ETHOLOGY JI Ethology PD OCT PY 1992 VL 92 IS 2 BP 155 EP 167 PG 13 WC Psychology, Biological; Behavioral Sciences; Zoology SC Psychology; Behavioral Sciences; Zoology GA JX916 UT WOS:A1992JX91600006 ER PT J AU SHEPHERD, IG CHENG, RK TALBOT, L AF SHEPHERD, IG CHENG, RK TALBOT, L TI EXPERIMENTAL CRITERIA FOR THE DETERMINATION OF FRACTAL PARAMETERS OF PREMIXED TURBULENT FLAMES SO EXPERIMENTS IN FLUIDS LA English DT Article AB The influence of spatial resolution, digitization noise, the number of records used for averaging, and the method of analysis on the determination of the fractal parameters of a high Damkohler number, methane/air, premixed, turbulent stagnation-point flame are investigated in this paper. The flow exit velocity was 5 m/s and the turbulent Reynolds number was 70 based on a integral scale of 3 mm and a turbulent intensity of 7%. The light source was a copper vapor laser which delivered 20 nsecs, 5 mJ pulses at 4 kHz and the tomographic cross-sections of the flame were recorded by a high speed movie camera. The spatial resolution of the images is 155 x 121 mum/pixel with a field of view of 50 x 65 mm. The stepping caliper technique for obtaining the fractal parameters is found to give the clearest indication of the cutoffs and the effects of noise. It is necessary to ensemble average the results from more than 25 statistically independent images to reduce sufficiently the scatter in the fractal parameters. The effects of reduced spatial resolution on fractal plots are estimated by artificial degradation of the resolution of the digitized flame boundaries. The effect of pixel resolution, an apparent increase in flame length below the inner scale rolloff, appears in the fractal plots when the measurent scale is less than approximately twice the pixel resolution. Although a clearer determination of fractal parameters is obtained by local averaging of the flame boundaries which removes digitization noise, at low spatial resolution this technique can reduce the fractal dimension. The degree of fractal isotropy of the flame surface can have a significant effect on the estimation of the flame surface area and hence burning rate from two-dimensional images. To estimate this isotropy a determination of the outer cutoff is required and three-dimensional measurements are probably also necessary. RP SHEPHERD, IG (reprint author), LAWRENCE BERKELEY LAB,DIV APPL SCI,COMBUST GRP,BERKELEY,CA 94720, USA. NR 14 TC 24 Z9 24 U1 0 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0723-4864 J9 EXP FLUIDS JI Exp. Fluids PD OCT PY 1992 VL 13 IS 6 BP 386 EP 392 PG 7 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA JV719 UT WOS:A1992JV71900004 ER PT J AU WALLECZEK, J AF WALLECZEK, J TI ELECTROMAGNETIC-FIELD EFFECTS ON CELLS OF THE IMMUNE-SYSTEM - THE ROLE OF CALCIUM SIGNALING SO FASEB JOURNAL LA English DT Review DE IMMUNE SYSTEM; SIGNAL TRANSDUCTION; CALCIUM; CELLULAR MECHANISMS; ELF ELECTROMAGNETIC FIELDS ID BRAIN-TISSUE INVITRO; HUMAN PERIPHERAL LYMPHOCYTES; VARYING MAGNETIC-FIELDS; LOW-FREQUENCY; ELECTRIC-FIELDS; BIOLOGICAL-SYSTEMS; CANCER PROMOTION; CEREBRAL TISSUE; ACTIVATION; EXPOSURE AB During the past decade considerable evidence has accumulated demonstrating that nonthermal exposures of cells of the immune system to extremely low-frequency (ELF) electromagnetic fields (< 300 Hz) can elicit cellular changes that might be relevant to in vivo immune activity. A similar responsiveness to nonionizing electromagnetic energy in this frequency range has also been documented for tissues of the neuroendocrine and musculoskeletal system. However, knowledge about the underlying biological mechanisms by which such fields can induce cellular changes is still very limited. It is generally believed that the cell membrane and Ca2+-regulated activity is involved in bioactive ELF field coupling to living systems. This article begins with a short review of the current state of knowledge concerning the effects of nonthermal levels of ELF electromagnetic fields on the biochemistry and activity of immune cells and then closely examines new results that suggest a role for Ca2+ in the induction of these cellular field effects. Based on these findings it is proposed that membrane-mediated Ca2+ signaling processes are involved in the mediation of field effects on the immune system. C1 LAWRENCE BERKELEY LAB,DIV RES MED & RADIAT BIOPHYS,BERKELEY,CA 94720. NR 69 TC 242 Z9 253 U1 0 U2 12 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD OCT PY 1992 VL 6 IS 13 BP 3177 EP 3185 PG 9 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA JU512 UT WOS:A1992JU51200010 PM 1397839 ER PT J AU FULKERSON, W SHEFFIELD, J AF FULKERSON, W SHEFFIELD, J TI THE UNITED-STATES NEEDS A NATIONAL MAGNETIC FUSION SITE SO FUSION ENGINEERING AND DESIGN LA English DT Article RP FULKERSON, W (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0920-3796 J9 FUSION ENG DES JI Fusion Eng. Des. PD OCT PY 1992 VL 19 IS 3 BP 181 EP 182 DI 10.1016/0920-3796(92)90027-2 PG 2 WC Nuclear Science & Technology SC Nuclear Science & Technology GA KA555 UT WOS:A1992KA55500001 ER PT J AU DSURNEY, SJ POPP, RA AF DSURNEY, SJ POPP, RA TI OXYGEN ASSOCIATION-DISSOCIATION AND STABILITY ANALYSIS ON MOUSE HEMOGLOBINS WITH MUTANT ALPHA-GLOBIN AND BETA-GLOBIN SO GENETICS LA English DT Article ID ETHYLNITROSOUREA; MUTATION AB Oxygen association-dissociation and hemoglobin stability analysis were performed on mouse hemoglobins with amino acid substitutions in an alpha-globin (alpha89, His to Leu) and a beta-globin (beta59, Lys to Ile). The variant alpha-globin, designated chain 5m in the Hba(g2) haplotype, had a high oxygen affinity and was stable. The variant beta-globin, (beta(s2)) of the Hbb(s2) haplotype, also had an elevated oxygen affinity and in addition was moderately unstable in 19% isopropanol. Hemoglobins from the expected nine (Hba(g2)/Hba(g2);Hbb(s)/Hbb(s) X Hba(a)/Hba(a);Hbb(s2)/Hbb(s2) F2 genotypes can be grouped into five classes of P50 values characterized by strict additivity and dependency on mutant globin gene dosage; physiologically, both globin variants gave indistinguishable effects on oxygen affinity. The hemoglobin of normal mice (Hba(a)/Hba(a);Hbb(s)/Hbb(s)) had a P50 = 40 mm Hg and the hemoglobin of Hba(g2)/Hba(g2);Hbb(s2)/Hbb(s2) F2 mice had a P50 = 25 mm Hg (human P50 = 26 mm Hg). Peripheral blood from Hba(g2)/Hba(g2);Hbb(s)/Hbb(s), Hba(a)/Hba(a);Hbb(s2)/Hbb(s2) and Hba(g2)/Hba(g2);Hbb(s2)/Hbb(s2) mice exhibited normal hematological values except for a slightly higher hematocrit for Hba(g2)/Hba(g2),Hbb(s)/Hbb(s) and Hba(g2)/Hba(g2);Hbb(s2)/Hbb(s2) mice, slightly elevated red cell counts for mice of the three mutant genotypes, and significantly lower values for the mean corpuscular volume and mean corpuscular hemoglobin for Hba(g2)/Hba(g2);Hbb(s2)/Hbb(s2) mice. C1 UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE,TN 37831. RP DSURNEY, SJ (reprint author), OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831, USA. FU NHLBI NIH HHS [R01 HL-43375] NR 22 TC 8 Z9 8 U1 0 U2 1 PU GENETICS PI BALTIMORE PA 428 EAST PRESTON ST, BALTIMORE, MD 21202 SN 0016-6731 J9 GENETICS JI Genetics PD OCT PY 1992 VL 132 IS 2 BP 545 EP 551 PG 7 WC Genetics & Heredity SC Genetics & Heredity GA JQ146 UT WOS:A1992JQ14600021 PM 1427042 ER PT J AU KELSEY, G SCHEDL, A RUPPERT, S NISWANDER, L MAGNUSON, T KLEBIG, ML RINCHIK, EM SCHUTZ, G AF KELSEY, G SCHEDL, A RUPPERT, S NISWANDER, L MAGNUSON, T KLEBIG, ML RINCHIK, EM SCHUTZ, G TI PHYSICAL MAPPING OF THE ALBINO-DELETION COMPLEX IN THE MOUSE TO LOCALIZE ALF/HSDR-1, A LOCUS REQUIRED FOR NEONATAL SURVIVAL SO GENOMICS LA English DT Article ID PHOSPHOENOLPYRUVATE CARBOXYKINASE GTP; MESSENGER-RNA; EXTRAEMBRYONIC ECTODERM; CHROMOSOMAL DELETIONS; GENES; EXPRESSION; REGION; MICE; DNA; TYROSINASE C1 CASE WESTERN RESERVE UNIV,DEPT GENET,CLEVELAND,OH 44106. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. RP KELSEY, G (reprint author), GERMAN CANC RES CTR,INST CELL & TUMOR BIOL,IM NEUENHEIMER FELD 280,W-6900 HEIDELBERG,GERMANY. RI Niswander, Lee/D-3976-2013; Schedl, Andreas/F-8823-2015 FU NICHD NIH HHS [HD24462] NR 48 TC 29 Z9 29 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD OCT PY 1992 VL 14 IS 2 BP 275 EP 287 DI 10.1016/S0888-7543(05)80217-4 PG 13 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA JR697 UT WOS:A1992JR69700010 PM 1427844 ER PT J AU SCHEDL, A RUPPERT, S KELSEY, G THIES, E NISWANDER, L MAGNUSON, T KLEBIG, ML RINCHIK, EM SCHUTZ, G AF SCHEDL, A RUPPERT, S KELSEY, G THIES, E NISWANDER, L MAGNUSON, T KLEBIG, ML RINCHIK, EM SCHUTZ, G TI CHROMOSOME JUMPING FROM FLANKING MARKERS DEFINES THE MINIMAL REGION FOR ALF/HSDR-1 WITHIN THE ALBINO-DELETION COMPLEX SO GENOMICS LA English DT Article ID LOCUS REGION; HEREDITARY TYROSINEMIA; RESTRICTION ENZYMES; CYSTIC-FIBROSIS; GENE; MOUSE; DNA; CLONING; LIBRARIES; IDENTIFICATION C1 CASE WESTERN RESERVE UNIV,DEPT GENET,CLEVELAND,OH 44106. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. RP SCHEDL, A (reprint author), GERMAN CANC RES CTR,INST CELL & TUMOR BIOL,IM NEUENHEIMER FELD 280,W-6900 HEIDELBERG,GERMANY. RI Niswander, Lee/D-3976-2013; Schedl, Andreas/F-8823-2015 FU NICHD NIH HHS [HD24462] NR 42 TC 15 Z9 15 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD OCT PY 1992 VL 14 IS 2 BP 288 EP 297 DI 10.1016/S0888-7543(05)80218-6 PG 10 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA JR697 UT WOS:A1992JR69700011 PM 1427845 ER PT J AU SHAW, DM STURCHIO, NC AF SHAW, DM STURCHIO, NC TI BORON-LITHIUM RELATIONSHIPS IN RHYOLITES AND ASSOCIATED THERMAL WATERS OF YOUNG SILICIC CALDERAS, WITH COMMENTS ON INCOMPATIBLE ELEMENT BEHAVIOR SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID HYDROTHERMAL SYSTEM; GEOTHERMAL SYSTEM; OCEANIC-CRUST; NEW-MEXICO; VALLES CALDERA; ION-EXCHANGE; MASS-BALANCE; HOT SPRINGS; YELLOWSTONE; CHEMISTRY AB This study had three goals: (1) to study B distribution in a rhyolitic volcanic sequence already extensively investigated for other elements; (2) to interpret the joint behaviour of B and Li during the interaction of such rocks with subsurface waters; and (3) to assess the manner in which water affects the behaviour of incompatible elements such as B and Gd. New B, Gd, and Sm analyses have been made on a suite of Yellowstone rhyolites, including fresh and partially devitrified glassy obsidian from surface exposures of several flows, drill-core of increasing degrees of alteration in the Biscuit Basin Flow, and flows drill-cores from other flows. Within the Biscuit Basin Flow, the Sm and Gd concentrations remain rather constant (9-12 and 8-10 ppm, respectively) and behave conservatively, independent of alteration. Boron decreases from about 10 to 3 ppm with progressive alteration, and Li increases from about 40 ppm by a factor of 2-3 in the most altered rocks. Thermal waters reflect leaching from the fresh rocks, but contain much less Li than B (B/Li almost-equal-to 3 compared with 0.8 in fresh obsidian). Retention of Li was favoured by abundant illitic alteration. Obsidians from the Valles and Long Valley calderas show greater Li loss during alteration. All the rhyolitic rocks lose B during aqueous alteration; the waters acquire both B and Li, but proportionately much more B. Natural waters of all kinds, including those from the three calderas, show six orders of magnitude range in aqueous B and Li, with a high degree of linear correlation and an average ratio B/Li essentially constant at 4.0. The linearity mainly expresses processes of dilution and concentration: reactions specific to B or Li engender waters with deviating B/Li. The patterns of Sm-Gd-B-Li variation in rocks exemplify two kinds of behaviour. In petrological processes with no hydrous phase (lunar rocks, mantle, fresh seafloor basalt, the lower continental crust), these elements are incompatible and behave similarly; when an aqueous phase is present B and Li behave independently of Sm and Gd. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP SHAW, DM (reprint author), MCMASTER UNIV,DEPT GEOL,HAMILTON L8S 4M1,ONTARIO,CANADA. NR 60 TC 22 Z9 22 U1 1 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD OCT PY 1992 VL 56 IS 10 BP 3723 EP 3731 DI 10.1016/0016-7037(92)90165-F PG 9 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA JU619 UT WOS:A1992JU61900009 ER PT J AU LINN, AM DEPAOLO, DJ INGERSOLL, RV AF LINN, AM DEPAOLO, DJ INGERSOLL, RV TI ND-SR ISOTOPIC, GEOCHEMICAL, AND PETROGRAPHIC STRATIGRAPHY AND PALEOTECTONIC ANALYSIS - MESOZOIC GREAT VALLEY FORE-ARC SEDIMENTARY-ROCKS OF CALIFORNIA SO GEOLOGICAL SOCIETY OF AMERICA BULLETIN LA English DT Article ID CENTRAL SIERRA-NEVADA; DEEP-SEA TURBIDITES; ARC BASIN; CRUSTAL EVOLUTION; NORTHERN CALIFORNIA; TECTONIC EVOLUTION; DETRITAL MODES; PROVENANCE; NEODYMIUM; SEQUENCE AB Measurements of Nd-Sr isotopes, major and trace elements, and model mineralogy were made on Upper Jurassic and Cretaceous Great Valley forearc sedimentary rocks to test models for the temporal and spatial evolution of Sierra Nevada arc sources. Isotopes and major and trace elements are sensitive provenance indicators because of the large west-east isotopic, geochemical, and age gradients in the plutonic rocks of the Sierra Nevada batholith, and because petrographic models indicate that source areas moved east during the Cretaceous. Isotopic and chemical variations are correlated in the forearc sandstone; as epsilon(Nd) decreases, Th, U, La, Nb, Zr, Hf, Pb, Rb, SiO2, and K2O concentrations increase, and FeO, MgO, TiO2, Ni, and Cr concentrations decrease. This relation is the same as that observed in the plutonic rocks and indicates that the arc was the primary source of sediment and that the sandstone chemistry was not disturbed by sedimentary processes. The epsilon(Nd)-epsilon(Sr) relation of San Joaquin Valley sandstone is the same as the plutonic rocks, but Sacramento Valley sandstone is elevated in epsilon(Sr) because of seawater exchange, weathering, and diagenesis. Whole-rock sandstone decreases in epsilon(Nd) from +7 to -5 and increases in Sr-87/Sr-86 from 0.7045 to 0.7073 with decreasing stratigraphic age. The Nd-Sr isotopic composition is correlative with the plagioclase to feldspar ratio and indicates that source areas moved inland during the Cretaceous. Upper Cretaceous San Joaquin Valley shale is similar in epsilon(Nd) to the sandstone, indicating that sandstone and shale were derived from the same source and that the Nd isotopic composition is independent of grain size. The shale is higher in Sr-87/Sr-86 than the sandstone, possibly due to concentration of biotite in the fine fraction during transport and subsequent Rb loss during diagenesis. Nd-Sr isotopes were used to construct models to locate source areas. Parameters include lithology, drainage basin geometry, and erosion rate. The age and isotopic compositions of the calculated igneous component of the sandstone correspond to the age and isotopic compositions of the plutonic rocks of the batholith; this correspondence indicates that (1) the isotopic composition of the plutonic rocks and the coeval volcanic cover were similar, (2) the volcanic front was denuded within a few million years, and (3) the sediment was derived from the head of the drainage basin, located at the migrating volcanic front. C1 UNIV CALIF LOS ANGELES,DEPT EARTH & SPACE SCI,LOS ANGELES,CA 90024. LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720. RP LINN, AM (reprint author), UNIV CALIF BERKELEY,BERKELEY CTR ISOTOPE GEOCHEM,DEPT GEOL & GEOPHYS,BERKELEY,CA 94720, USA. NR 73 TC 52 Z9 54 U1 0 U2 11 PU GEOLOGICAL SOC AMERICA PI BOULDER PA PO BOX 9140 3300 PENROSE PLACE, BOULDER, CO 80301 SN 0016-7606 J9 GEOL SOC AM BULL JI Geol. Soc. Am. Bull. PD OCT PY 1992 VL 104 IS 10 BP 1264 EP 1279 DI 10.1130/0016-7606(1992)104<1264:NSIGAP>2.3.CO;2 PG 16 WC Geosciences, Multidisciplinary SC Geology GA JQ942 UT WOS:A1992JQ94200004 ER PT J AU WESTRICH, HR GERLACH, TM AF WESTRICH, HR GERLACH, TM TI MAGMATIC GAS SOURCE FOR THE STRATOSPHERIC SO2 CLOUD FROM THE JUNE 15, 1991, ERUPTION OF MOUNT-PINATUBO SO GEOLOGY LA English DT Article ID ANHYDRITE-BEARING PUMICES; EL-CHICHON VOLCANO; 1982 ERUPTIONS; SULFUR AB A water-rich magmatic gas phase escaped explosively from Mount Pinatubo on June 15, 1991, taking with it a load of crystalline and molten material sufficient to form pumice and tephra deposits with an estimated total dense-rock-equivalent volume of 3-5 km3 (Scott et al., 1991), and carrying in it enough sulfur to form a 20 Mt SO2 cloud in the stratosphere. Application of the "petrologic method" for estimating sulfur degassing during the climactic event from the sulfur content of trapped glass inclusions and matrix glasses in the pumice deposits requires an unacceptably large volume of erupted magma to account for SO2 in the stratospheric cloud. The ubiquitous presence of primary vapor bubbles in glass inclusions and unaltered anhydrite phenocrysts in the pumice suggest that sulfur was present in a separate H2O-rich gas phase of the Pinatubo magma before eruption. Thus, for this eruption, and perhaps others, the petrologic method for estimating sulfur degassing is prone to substantial underestimation of sulfur release and the potential climatic impact of past explosive eruptions. C1 US GEOL SURVEY,CASCADES VOLCANO OBSERV,VANCOUVER,WA 98661. RP WESTRICH, HR (reprint author), SANDIA NATL LABS,DEPT GEOCHEM 6118,ALBUQUERQUE,NM 87185, USA. NR 26 TC 117 Z9 118 U1 2 U2 9 PU GEOLOGICAL SOC AMERICA PI BOULDER PA PO BOX 9140 3300 PENROSE PLACE, BOULDER, CO 80301 SN 0091-7613 J9 GEOLOGY JI Geology PD OCT PY 1992 VL 20 IS 10 BP 867 EP 870 DI 10.1130/0091-7613(1992)020<0867:MGSFTS>2.3.CO;2 PG 4 WC Geology SC Geology GA JQ943 UT WOS:A1992JQ94300001 ER PT J AU GLADNEY, ES JONES, EA NICKELL, EJ ROELANDTS, I AF GLADNEY, ES JONES, EA NICKELL, EJ ROELANDTS, I TI 1988 COMPILATION OF ELEMENTAL CONCENTRATION DATA FOR USGS AGV-1, GSP-1 AND G-2 SO GEOSTANDARDS NEWSLETTER LA English DT Article ID RARE-EARTH ELEMENTS; STANDARDS; SAMPLES AB Concentration data on up to 90 individual constituents in USGS AGV-1, GSP-1, and G-2 have been collected from 1270 journal articles and technical reports. These data are summarized in consensus (mean) values with uncertainties expressed as +/- one standard deviation. Mean values are also calculated as a function of analytical procedure and all raw data are given in the tables. Recommended values are proposed based upon data criteria used by NIST (National Institute of Standards and Technology, formerly the National Bureau of Standards or NBS). C1 UNIV LIEGE,B-4000 SART 1,BELGIUM. RP GLADNEY, ES (reprint author), LOS ALAMOS NATL LAB,HLTH & ENVIRONM CHEM GRP,MS K484,LOS ALAMOS,NM 87545, USA. NR 12 TC 41 Z9 41 U1 0 U2 0 PU GEOSTANDARDS PI VANDOEUVRE NANCY PA 15 RUE NOTRE-DAME-DES-PAUVRES BP 20, 54501 VANDOEUVRE NANCY, FRANCE SN 0150-5505 J9 GEOSTANDARD NEWSLETT JI Geostand. Newsl. PD OCT PY 1992 VL 16 IS 2 BP 111 EP 300 DI 10.1111/j.1751-908X.1992.tb00492.x PG 190 WC Geosciences, Multidisciplinary SC Geology GA JT554 UT WOS:A1992JT55400001 ER PT J AU STRAUME, T EGBERT, SD WOOLSON, WA FINKEL, RC KUBIK, PW GOVE, HE SHARMA, P HOSHI, M AF STRAUME, T EGBERT, SD WOOLSON, WA FINKEL, RC KUBIK, PW GOVE, HE SHARMA, P HOSHI, M TI NEUTRON DISCREPANCIES IN THE DS86 HIROSHIMA DOSIMETRY SYSTEM SO HEALTH PHYSICS LA English DT Article DE HIROSHIMA; DS86; DOSIMETRY; NEUTRONS ID ACCELERATOR MASS-SPECTROMETRY; ATOMIC-BOMB; EU-152 ACTIVITIES AB More than a decade has passed since a complete revision was initiated of the radiation doses received by survivors of the Hiroshima and Nagasaki atomic bombings. The new dosimetry system (DS86) was completed in 1986 and adopted shortly thereafter. Overall, DS86 was noted to be a clear improvement over the old dosimetry system. However, based on limited validation measurements, troublesome inconsistencies were suggested for neutrons. Since 1986, a substantial number of additional neutron activation measurements have been made in mineral and metal samples from Hiroshima. Importantly, a large number of measurements have now been made at distances beyond 1 km. Here, inconsistencies between neutron activation measurements and DS86 calculations for Hiroshima are examined using all available measurement data, including new measurements for Cl-36 which extend the measurement range to more than 1.7 km from the epicenter, and Monte Carlo modeling calculations for each sample measured. Results show that thermal neutron activation measured beyond approximately 1 km in Hiroshima (at distances most relevant for radiation-risk evaluation) is two to 10, or more, times higher than that calculated based on DS86. Similar trends observed when comparing results by several independent measurement laboratories, using different analytical methods, suggest that the DS86 calculations for low-energy neutrons are in error. Because of the importance of the Hiroshima data in radiation risk evaluation, this large discrepancy is in need of resolution. C1 SCI APPLICAT INT CORP, SAN DIEGO, CA 92121 USA. UNIV ROCHESTER, ROCHESTER, NY 14627 USA. HIROSHIMA UNIV, HIROSHIMA 730, JAPAN. RP STRAUME, T (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 5507, LIVERMORE, CA 94550 USA. NR 26 TC 71 Z9 71 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD OCT PY 1992 VL 63 IS 4 BP 421 EP 426 DI 10.1097/00004032-199210000-00006 PG 6 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 JP081 UT WOS:A1992JP08100007 PM 1526783 ER PT J AU DURBIN, PW JEUNG, N KULLGREN, B CLEMONS, GK AF DURBIN, PW JEUNG, N KULLGREN, B CLEMONS, GK TI GROSS COMPOSITION AND PLASMA AND EXTRACELLULAR WATER VOLUMES OF TISSUES OF A REFERENCE MOUSE SO HEALTH PHYSICS LA English DT Article DE DOSIMETRY; PLASMA; WATER; SKELETON; BIOKINETICS ID SEQUESTERING AGENTS; ACTINIDES; LIGANDS; MICE; KINETICS; REMOVAL AB The laboratory mouse is a primary animal model for experimental radiation biology and pharmacology. The usefulness of the mouse for those purposes is enhanced if detailed data are available to define a Reference Mouse [weight and composition of soft tissues and bones and their in-life content of plasma and extracellular water (ECW)]. Only fragmentary data are available for wet weights and plasma volumes of soft tissues and bones of mice; there are no reports of total volume or distribution of ECW in mouse tissues. To remedy those defects, wet weight and composition of all major organs and soft tissues were measured, and measurements were made or estimates obtained for wet weights and composition of all bones of the young adult (12 to 13 wk old) female Swiss-Webster mouse. I-125-transferrin was used as a tracer for plasma, and Na-22 was used as a tracer for ECW. Tissue weight and tracer measurements were conducted using the metabolic balance approach and a freezing technique that avoids blood loss during dissection. Results compare favorably with published weights and plasma volumes of tissues of mature mice of both genders and other strains. Total plasma volume (48.9 +/- 44-mu-L g-1) and Na-space (232 +/- 15-mu-L g-1), and the specific plasma and ECW volumes of vascular mouse tissues, exceed those of rat tissues. Applications of the data are presented: (1) interpretation of plutonium uptake kinetics in the mouse; (2) estimation of masses of mineralized bone tissue (1.92 g), bone marrow (1.2 g), and endosteal (BS) cells (0.2 g) of the mouse. C1 LAWRENCE BERKELEY LAB, DIV CELL & MOLEC BIOL, BERKELEY, CA 94720 USA. RP DURBIN, PW (reprint author), LAWRENCE BERKELEY LAB, DIV RES MED & RADIAT BIOPHYS, BERKELEY, CA 94720 USA. FU NIEHS NIH HHS [ES02698] NR 39 TC 32 Z9 32 U1 1 U2 2 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD OCT PY 1992 VL 63 IS 4 BP 427 EP 442 DI 10.1097/00004032-199210000-00007 PG 16 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 JP081 UT WOS:A1992JP08100008 PM 1526784 ER PT J AU BOND, VP AF BOND, VP TI NCRP REPORT-104, THE RELATIVE BIOLOGICAL EFFECTIVENESS OF RADIATIONS OF DIFFERENT QUALITY - REPLY SO HEALTH PHYSICS LA English DT Letter RP BOND, VP (reprint author), BROOKHAVEN NATL LAB, ASSOCIATED UNIV INC, DEPT MED, UPTON, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD OCT PY 1992 VL 63 IS 4 BP 465 EP 465 PG 1 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA JP081 UT WOS:A1992JP08100017 ER PT J AU JAMASBI, RJ KENNEL, SJ STONER, GD AF JAMASBI, RJ KENNEL, SJ STONER, GD TI A MONOCLONAL-ANTIBODY PRODUCED AGAINST A RAT ESOPHAGEAL-CARCINOMA CELL-LINE REACTS WITH AN INTEGRIN-LIKE MOLECULE EXPRESSED BY RAT EPITHELIAL-CELLS SO HYBRIDOMA LA English DT Article ID RESPIRATORY-TRACT CARCINOMAS; MURINE LUNG CARCINOMAS; N-NITROSOBENZYLMETHYLAMINE; FIBRONECTIN RECEPTOR; CONCOMITANT LOSS; INVITRO CULTURE; SURFACE PROTEIN; TUMOR-ANTIGEN; ALPHA-6-BETA-4; FAMILY AB A monoclonal antibody, designated MAb-5A (IQG1), was generated against a tumorigenic rat esophageal epithelial cell line, B-2T. MAb-5A reacted with a series of non-tumorigenic and tumorigenic epithelial cell lines derived from F-344 rat esophagi or tracheas. However, the highest level of antigen expression was detected on tumorigenic rat epithelial cell lines. A trace amount of antigen was detected in primary cultures of normal rat epithelial cells derived from either esophagi or tracheas. MAb-5A did not react with rat fibroblasts. MAb-5A reacted with B-2T derived tumor tissues propagated in vivo but showed only slight reactivity with normal rat esophageal epithelial tissues. Cell surface radioiodination, extraction and immunoprecipitation experiments were conducted to characterize the antigen molecule. Analysis of the immunoprecipitates by SDS-PAGE and autoradiography revealed two protein bands with mobilities corresponding to approximately 140 and 120 kDa, respectively. Under reducing conditions the 140 kDa band shifted to approximately 120 kDa whereas the 120 kDa band shifted upward to approximately 130 kDa. The non-reduced/reduced mobilities of these bands suggest that they may be members of the integrin family of matrix receptors. A polyclonal antibody to the beta1 subunit immunoprecipitated two similar bands detected by MAb-5A, further suggesting that the antigen complex may be related to members of the integrin superfamily. C1 BOWLING GREEN STATE UNIV,DEPT BIOL SCI,BOWLING GREEN,OH 43403. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. MED COLL OHIO,DEPT PATHOL,TOLEDO,OH 43614. RP JAMASBI, RJ (reprint author), BOWLING GREEN STATE UNIV,DEPT MED TECHNOL,504 LIFE SCI BLDG,BOWLING GREEN,OH 43403, USA. FU NCI NIH HHS [CA 28950] NR 31 TC 5 Z9 5 U1 0 U2 0 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0272-457X J9 HYBRIDOMA JI Hybridoma PD OCT PY 1992 VL 11 IS 5 BP 581 EP 594 DI 10.1089/hyb.1992.11.581 PG 14 WC Biochemical Research Methods; Biotechnology & Applied Microbiology; Immunology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Immunology GA JU871 UT WOS:A1992JU87100005 PM 1459582 ER PT J AU SUCHA, G BOLTON, SR CHEMLA, DS AF SUCHA, G BOLTON, SR CHEMLA, DS TI GENERATION OF HIGH-POWER FEMTOSECOND PULSES NEAR 1.5-MU-M USING A COLOR-CENTER LASER SYSTEM SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID SOLITON LASER; CONTINUUM GENERATION; OPTICAL-PROPERTIES; MODE-LOCKING; AMPLIFICATION; NACL AB We have developed a high-power F-center laser system capable of generating femtosecond pulses with energies exceeding 50 muJ at wavelengths near 1.5 mum. Short pulses (140 fs) from an additive-pulse mode-locked NaCl laser are amplified in a multipass NaCl amplifier at kilohertz repetition rates. The system can generate peak powers approaching 500 MW, with wavelengths tunable from 1.52 to 1.64 mum. The amplified pulses are used to generate continuum in various solid media without optical damage. The continuum generated in BaF2 is extremely broad-extending from below 400 nm to 3.5 mum. Construction and operating details are discussed as well as the system's utility for femtosecond measurements in the infrared and high-power experiments. C1 LAWRENCE BERKELEY LAB,DEPT PHYS,BERKELEY,CA 94720. RP SUCHA, G (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI RES,MS-2-300,BERKELEY,CA 94720, USA. NR 25 TC 11 Z9 11 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD OCT PY 1992 VL 28 IS 10 BP 2163 EP 2175 DI 10.1109/3.159525 PG 13 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA JQ975 UT WOS:A1992JQ97500024 ER PT J AU YANKELEVICH, DR DIENES, A KNOESEN, A SCHOENLEIN, RW SHANK, CV AF YANKELEVICH, DR DIENES, A KNOESEN, A SCHOENLEIN, RW SHANK, CV TI GENERATION OF 312-NM, FEMTOSECOND PULSES USING A POLED COPOLYMER FILM SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID 2ND-HARMONIC GENERATION; HARMONIC-GENERATION; OPTICAL PULSES AB A 2.5 mum thick corona poled copolymer film was used to double approximately 13 fs long, 50 nJ energy, 625 nm wavelength pulses at 8 KHz repetition rate. The large effective d coefficient results in a relatively high conversion efficiency for such a thin film. A maximum efficiency of 0.13% has been measured. Long term stable operation was obtained with efficiencies of 0.025% at the damage threshold of approximately 160 GW/cm2. The damage threshold is remarkably high for organic materials, and was found to be peak intensity rather than average intensity dependent. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP YANKELEVICH, DR (reprint author), UNIV CALIF DAVIS,DEPT ELECT ENGN & COMP SCI,OPTOELECTR & FEMTOSECOND OPT LAB,DAVIS,CA 95616, USA. RI Schoenlein, Robert/D-1301-2014 OI Schoenlein, Robert/0000-0002-6066-7566 NR 19 TC 24 Z9 24 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD OCT PY 1992 VL 28 IS 10 BP 2398 EP 2403 DI 10.1109/3.159546 PG 6 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA JQ975 UT WOS:A1992JQ97500045 ER PT J AU FU, WS HARRIS, JS BINDER, R KOCH, SW KLEM, JF OLBRIGHT, GR AF FU, WS HARRIS, JS BINDER, R KOCH, SW KLEM, JF OLBRIGHT, GR TI NONLINEAR OPTICAL-PROPERTIES AND ULTRAFAST RESPONSE OF GAAS-ALAS TYPE-II QUANTUM-WELLS SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID ELECTRIC-FIELD; GAAS/ALAS SUPERLATTICES; EXCITED SEMICONDUCTORS; ABSORPTION; LOCALIZATION; DYNAMICS; CARRIERS; GAP; CW AB Femtosecond and CW optical nonlinearities associated with the spatial separation of electrons and holes in GaAs-AlAs type-II quantum wells are reported. Without applied electric field, the nonlinearities due to blue shift and bleaching of the heavy-hole exciton resonance are observed. An applied static longitudinal electric field changes these nonlinearities through the redistribution of electrons. Furthermore, optical nonlinearities and even gain for ultrahigh excitation conditions in type-II structures are reported and compared to those in similar type-I structures. The theoretical framework used for modeling the type-II system in the presence and absence of electrons is described. C1 UNIV ARIZONA,CTR OPT SCI,TUCSON,AZ 85721. UNIV ARIZONA,DEPT PHYS,TUCSON,AZ 85721. SANDIA NATL LABS,TECH STAFF,ALBUQUERQUE,NM 87185. PHOTON RES INC,BROOMFIELD,CO 80021. RP FU, WS (reprint author), STANFORD UNIV,SOLID STATE ELECTR LAB,STANFORD,CA 94305, USA. NR 44 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD OCT PY 1992 VL 28 IS 10 BP 2404 EP 2415 DI 10.1109/3.159547 PG 12 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA JQ975 UT WOS:A1992JQ97500046 ER PT J AU HARDY, JE AF HARDY, JE TI PERFORMANCE OF A DRAG TRANSDUCER UNDER SIMULATED PWR REFILL REFLOOD FLOW CONDITIONS SO IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT LA English DT Article DE INSTRUMENTATION; FLOW MOMENTUM; 2-PHASE FLOW; STRAIN GAUGES; DRAG TRANSDUCER AB A strain gage-based drag transducer was developed to measure two-phase flow in simulated PWR test facilities. The drag sensor was designed to sample a large amount of the flow with minimum disturbance to the flow, to be sensitive over a 1000-to-1 range, to be accurate over a 200:1 turndown ratio, and to survive in a hostile steam/water environment. The drag transducer consists of a unique combination of an elongated proving ring, a temperature-compensated, full-bridge strain gage configuration, and a drag target that utilized part of the test vessel internals. The drag body measurement system produced high-quality data for a variety of test conditions, which has led to a better understanding of the phenomena occurring during the refill/reflood stages of a postulated PWR loss-of-coolant accident. RP HARDY, JE (reprint author), OAK RIDGE NATL LAB,DIV INSTRUMENTAT & CONTROLS,OAK RIDGE,TN 37831, USA. NR 7 TC 0 Z9 0 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9456 J9 IEEE T INSTRUM MEAS JI IEEE Trans. Instrum. Meas. PD OCT PY 1992 VL 41 IS 5 BP 611 EP 615 DI 10.1109/19.177330 PG 5 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA JZ107 UT WOS:A1992JZ10700005 ER PT J AU MOSES, WW DERENZO, SE SHLICHTA, PJ AF MOSES, WW DERENZO, SE SHLICHTA, PJ TI SCINTILLATION PROPERTIES OF LEAD SULFATE SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article ID LIGHT AB We report on the scintillation properties of lead sulfate (PbSO4), a scintillator that shows promise as a high energy photon detector. Its physical properties are well suited for gamma detection, as. it has a density of 6.4 gm/cm3, a 1/e attenuation length for 511 keV photons of 12 cm, is not affected by air or moisture, and is cut and polished easily. In 99.998% pure PbSO4 crystals at room temperature excited by 511 keV annihilation photons, the fluorescence decay lifetime contains significant fast components having 1.8 ns (5%) and 19 ns (36%) decay times, but with longer components having 95 ns (36%) and 425 ns (23%) decay times. The peak emission wave-length is 335 nm, which is transmitted by borosilicate glass windowed photomultiplier tubes. The total scintillation light output increases with decreasing temperature from 3,200 photons/MeV at +45-degrees-C to 4,900 photons/MeV at room temperature (+25-degrees-C ) and 68,500 photons/MeV at -145-degrees-C. In an imperfect, 3 mm cube of a naturally occurring mineral form of PbSO4 (anglesite) at room temperature, a 511 keV photopeak is seen with a total light output of 60% that of BGO. There are significant sample to sample variations of the light output among anglesite samples, so the light output of lead sulfate may improve when large synthetic crystals become available. C1 CRYSTAL RES, SAN PEDRO, CA 90732 USA. RP MOSES, WW (reprint author), LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. NR 10 TC 20 Z9 21 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9499 EI 1558-1578 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1190 EP 1194 DI 10.1109/23.173176 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400001 ER PT J AU JING, T CHO, G DREWERY, J FUJIEDA, I KAPLAN, SN MIRESHGHI, A PEREZMENDEZ, V WILDERMUTH, D AF JING, T CHO, G DREWERY, J FUJIEDA, I KAPLAN, SN MIRESHGHI, A PEREZMENDEZ, V WILDERMUTH, D TI ENHANCED COLUMNAR STRUCTURE IN CSI LAYER BY SUBSTRATE PATTERNING SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC ID CSI(TL) AB Columnar structure in evaporated CsI layers can be controlled by patterning substrates as well as varying evaporation conditions. Mesh-patterned substrates with various dimensions were created by spin-coating polyimide on glass or amorphous silicon substrates and defining patterns with standard photolithography technique. CsI(TI) layers 200-1000 mum were evaporated. Scintillation properties of these evaporated layers, such as light yield and speed, were equivalent to those of the source materials. Spatial resolution of X-ray detectors consisting of these layers and a linear array of Si photodiodes was evaluated by exposing them to a 25 mum narrow beam of X-ray. The results obtained with 200 mum thick CsI layers coupled to a linear photodiode array with 20 dots/mm resolution showed that the spatial resolution of CsI(TI) evaporated on patterned substrates was about 75 mum FWHM, whereas that of CsI(TI) on flat substrates was about 220 mum FWHM. Micrographs taken by SEM revealed that these layers retained the well-defined columnar struature originating from substrate patterns. Adhesion and light transmission of CsI(TI) were also improved by patterning the substrate. C1 XEROX CORP,PALO ALTO RES CTR,PALO ALTO,CA 94304. RP JING, T (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Cho, Gyuseong/C-1527-2011 NR 8 TC 14 Z9 15 U1 0 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1195 EP 1198 DI 10.1109/23.173177 PN 1 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400002 ER PT J AU BROSS, AD PLADALMAU, A AF BROSS, AD PLADALMAU, A TI RADIATION-DAMAGE OF PLASTIC SCINTILLATORS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article AB Radiation damage studies were performed on polystyrene-based plastic scintillators which contained p-terphenyl plus either BBQ, 3HF, or dimethyl-POPOP as dopants. Several identical sample sets were prepared to observe, in different experiments, the effects of dose rate (1 Mrad/h vs. 30 Krad/h) and environment (N2 vs. Ar vs. H-2). Transmittance and light yield measurements performed before irradiation, after irradiation, and after an oxygen annealing period showed no significant differences in the radiation susceptibility of the scintillators under the different experimental conditions. Two additional multi-component sample sets were also prepared; one set was made using pure dopants and the other made utilizing pure dopants which had previously been exposed to large doses of gamma-radiation. No difference in either transmittance or light yield was observed between the two sample sets. Simultaneously, radiation damage studies were carried out on pure polystyrene samples. Special emphasis was put on irradiations in oxygen and on the oxygen annealing process. These experiments indicated that: (a) Irradiations in which oxygen is continuously available throughout the bulk of the the polystyrene sample are the most damaging; (b) During the oxygen annealing process, the annealing rate is proportional to the oxygen diffusion rate; and (c) Oxygen reacts with free radicals in the sample, contributing to an increase in permanent radiation-induced absorption. RP FERMI NATL ACCELERATOR LAB, POB 500, BATAVIA, IL 60510 USA. NR 14 TC 16 Z9 16 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9499 EI 1558-1578 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1199 EP 1204 DI 10.1109/23.173178 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400003 ER PT J AU YATES, GJ SMITH, GW ZAGARINO, P THOMAS, MC AF YATES, GJ SMITH, GW ZAGARINO, P THOMAS, MC TI MEASURING NEUTRON FLUENCES AND GAMMA X-RAY FLUXES WITH CCD CAMERAS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC AB The capability to measure bursts of neutron fluences and gamma/x ray fluxes directly with charge coupled device (CCD) cameras while being able to distinguish between the video signals produced by these two types of radiation, even when they occur simultaneously, has been demonstrated. Volume and area measurements of transient radiation-induced pixel charge in English Electric Valve (EEV) Frame Transfer (FT) charge coupled devices (CCDs) from irradiation with pulsed neutrons (14 MeV) and Bremsstrahlung photons (4-12 MeV endpoint) are utilized to calibrate the devices as radiometric imaging sensors capable of distinguishing between the two types of ionizing radiation. Measurements indicate almost-equal-to 0.5 V/rad responsivity with greater-than-or-equal-to 1 rad required for saturation from photon irradiation. Neutron-generated localized charge centers or "peaks" binned by area and amplitude as functions of fluence in the 10(5) to 10(7) n/cm2 range indicate smearing over almost-equal-to 1 to 10% of CCD array with charge per pixel ranging between noise and saturation levels. C1 ATOM WEAP ESTAB,READING RG7 PR,BERKS,ENGLAND. EG&G ENERGY MEASUREMENT GRP,SANTA BARBARA CALIF OPERAT,GOLETA,CA 93017. RP YATES, GJ (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,GRP P15,MS D406,LOS ALAMOS,NM 87545, USA. NR 8 TC 4 Z9 5 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1217 EP 1225 DI 10.1109/23.173181 PN 1 PG 9 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400006 ER PT J AU MCGREGOR, DS KNOLL, GF EISEN, Y BRAKE, R AF MCGREGOR, DS KNOLL, GF EISEN, Y BRAKE, R TI DEVELOPMENT OF BULK GAAS ROOM-TEMPERATURE RADIATION DETECTORS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC AB GaAs is a wide band gap semiconductor with potential use as a room temperature radiation detector. Various configurations of Schottky diode detectors were fabricated with bulk crystals of liquid encapsulated Czochralski (LEC) semi-insulating undoped GaAs material. Basic detector construction utilized one Ti/Au Schottky contact and one Au/Ge/Ni alloyed ohmic contact. Pulsed X-ray analysis indicated pulse decay times dependent on bias voltage. Pulse height analysis disclosed non-uniform electric field distributions across the detectors tentatively explained as a consequence of native deep level donors (EL2) in the crystal. Pulse height spectra measured from an Am-241 alpha particle source at room temperature resulted in resolution ranging from 2.2% to 3.1% at FWHM for several detectors with a typical resolution of 2.5%. Low energy gamma rays measured under room temperature operating conditions resulted in observed full energy peaks of 60 keV and 122 keV photons with measured FWHM's of 22 keV and 40 keV, respectively. C1 ISRAEL ATOM ENERGY COMMISS,SOREQ NUCL RES CTR,IL-70600 YAVNE,ISRAEL. LOS ALAMOS NATL LAB,RADIAT PROTECT GRP,LOS ALAMOS,NM 87545. RP MCGREGOR, DS (reprint author), UNIV MICHIGAN,DEPT NUCL ENGN,ANN ARBOR,MI 48109, USA. NR 25 TC 41 Z9 41 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1226 EP 1236 DI 10.1109/23.173182 PN 1 PG 11 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400007 ER PT J AU BARNES, PD DASILVA, A ELLMAN, B EMES, J HALLER, EE LANGE, AE ING, K ROSS, RR SADOULET, B SHUTT, T SMITH, G STUBBS, C WANG, N WHITE, S YVON, D AF BARNES, PD DASILVA, A ELLMAN, B EMES, J HALLER, EE LANGE, AE ING, K ROSS, RR SADOULET, B SHUTT, T SMITH, G STUBBS, C WANG, N WHITE, S YVON, D TI SIMULTANEOUS MEASUREMENT OF THERMAL AND IONIZATION SIGNALS IN A 60-G CRYOGENIC GERMANIUM DETECTOR SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC ID COLD DARK MATTER; LIMITS; CANDIDATES; UNIVERSE AB We present new results from a cryogenic detector instrumented to measure both the phonon and ionization signals. The detector is a 60 g Ge disk operated at 30 mK. We have made significant improvements in the electronics noise, threshold, and energy resolution of the device. The baseline FWHM, corresponding to the total system noise, is 1.55 keV in the phonon channel and 1.59 keV in the ionization channel. At 60 keV the FWHM are 1.9 keV and 1.7 keV in the phonon and ionization channels, respectively. We have demonstrated for the first time a discrimination between electron recoils and nuclear recoils at low energy. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. UNIV BRITISH COLUMBIA,DEPT PHYS,VANCOUVER V6T 1Z1,BC,CANADA. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP BARNES, PD (reprint author), UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94720, USA. RI Stubbs, Christopher/C-2829-2012; Yvon, Dominique/D-2280-2015 OI Stubbs, Christopher/0000-0003-0347-1724; NR 24 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1237 EP 1241 DI 10.1109/23.173183 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400008 ER PT J AU BERRIDGE, SC BRAU, JE BUGG, WM FREY, R FURUNO, K GIOUMOUSIS, A HALLER, G HUBER, J HWANG, H KROEGER, RS PARK, H PITTS, KT SEWARD, P WEIDEMANN, AW WHITE, SL ZEITLIN, CJ AF BERRIDGE, SC BRAU, JE BUGG, WM FREY, R FURUNO, K GIOUMOUSIS, A HALLER, G HUBER, J HWANG, H KROEGER, RS PARK, H PITTS, KT SEWARD, P WEIDEMANN, AW WHITE, SL ZEITLIN, CJ TI 1ST RESULTS FROM THE SLD SILICON CALORIMETERS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC ID ELECTROMAGNETIC CALORIMETER; SHOWER DEVELOPMENT; TUNGSTEN; ENERGIES AB The small-angle calorimeters of the SLD were successfully operated during the recent SLC engineering run. The Luminosity Monitor and Small-Angle Tagger (LMSAT) covers the angular region between 28 and 68 milliradians from the beam axis, while the Medium-Angle Silicon Calorimeter (MASC) covers the 68-190 milliradian region. Both are silicon-tungsten sampling calorimeters; the LMSAT employs 23 layers of 0.86 X0 sampling, while the MASC has 10 layers of 1.74 X0 sampling. We present results from the first run of the SLC with the SLD on beamline. C1 STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. RP BERRIDGE, SC (reprint author), UNIV OREGON,DEPT PHYS,EUGENE,OR 97403, USA. NR 16 TC 7 Z9 7 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1242 EP 1248 DI 10.1109/23.173184 PN 1 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400009 ER PT J AU MCMANUS, A BODEN, A CHEN, TY COOPER, M COX, B FORTNEY, L GOLOVATYUK, V HANLET, P KOWALD, W MAZUR, P NELSON, K RAMACHANDRAN, S RECAGNI, M SEGAL, J SELOVE, W SMITH, R SUN, J TRISCHUK, J VANBERG, R YAO, N ZOU, B AF MCMANUS, A BODEN, A CHEN, TY COOPER, M COX, B FORTNEY, L GOLOVATYUK, V HANLET, P KOWALD, W MAZUR, P NELSON, K RAMACHANDRAN, S RECAGNI, M SEGAL, J SELOVE, W SMITH, R SUN, J TRISCHUK, J VANBERG, R YAO, N ZOU, B TI PERFORMANCE OF A SILICON MICROSTRIP DETECTOR IN A VERY HIGH-RATE ENVIRONMENT SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC AB A silicon microstrip detector (SSD) system for use in very high rate experiments has been designed[1,2,3,4,5,6] for Experiment E771[7] at Fermi National Accelerator laboratory The detector electronics were designed from the ground up using ASIC chip sets where commercial circuits where not suitable. The electronics for the SSD were designed to operate with interaction rates up to 10(7) interaction/sec (beam rates of 2 x 10(8)s proton/sec). In addition to speed, the detector for the current run in very compact with 10000 channels of active detector in a volume of 5cm x 5cm x 10cm. The system will be expanded to 16000 channels in the next Fermilab fixed target run. The strip pitch ranges from 25 mum in the center of the detector near the target to 100 mum pitch at the most downstream, outer edge of the detector. The readout is a latch design with efficiencies of approximately 95% even in the presence of radiation damage and high leakage currents. The detector and associated amplifier electronics has presently been operated at 20-degrees-C and is designed to operate at 8-degrees-C. C1 UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. NANJING UNIV,NANJING,PEOPLES R CHINA. DUKE UNIV,DURHAM,NC 27706. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV PENN,PHILADELPHIA,PA 19104. MCGILL UNIV,MONTREAL H3A 2T5,QUEBEC,CANADA. VANIER COLL,MONTREAL,QUEBEC,CANADA. RP MCMANUS, A (reprint author), UNIV VIRGINIA,CHARLOTTESVILLE,VA 22903, USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1249 EP 1253 DI 10.1109/23.173185 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400010 ER PT J AU COOKE, BJ LACKNER, KS PALOUNEK, APT SHARP, DH WINTER, L ZIOCK, HJ AF COOKE, BJ LACKNER, KS PALOUNEK, APT SHARP, DH WINTER, L ZIOCK, HJ TI EFFICIENT DATA-TRANSMISSION FROM SILICON-WAFER STRIP DETECTORS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC ID MODULATOR AB An architecture for on-water processing is proposed for central silicon-strip tracker systems as they are currently designed for high energy physics experiments at the SSC, and for heavy ion experiments at RHIC. The data compression achievable with on-wafer processing would make it possible to transmit all data generated to the outside of the detector system. A set of data which completely describes the state of the wafer for low occupancy events and which contains important statistical information for more complex events can be transmitted immediately. This information could be used in early trigger decisions. Additional data packages which complete the description of the state of the wafer vary in size and are sent through a second channel. By buffering this channel the required bandwidth can be kept far below the peak data rates which occur in rare but interesting events. RP COOKE, BJ (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 18 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1254 EP 1258 DI 10.1109/23.173186 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400011 ER PT J AU IWANCZYK, JS DORRI, N WANG, M SZCZEBIOT, RW DABROWSKI, AJ HEDMAN, B HODGSON, KO PATT, BE AF IWANCZYK, JS DORRI, N WANG, M SZCZEBIOT, RW DABROWSKI, AJ HEDMAN, B HODGSON, KO PATT, BE TI 20-ELEMENT HGI2 ENERGY DISPERSIVE-X-RAY ARRAY DETECTOR SYSTEM SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC ID MINIATURIZED PROCESSING ELECTRONICS; MERCURIC IODIDE AB This paper describes recent progress in the development of HgI2 energy dispersive x-ray detector arrays and associated miniaturized processing electronics for synchrotron radiations research applications. The experimental results with a 20-element array detector were obtained under realistic synchrotron beam conditions at SSRL. An energy resolution of 250 eV (FWHM) at 5.9 keV (Mn-Kalpha) was achieved. Energy resolution and throughput measurements versus input count rate and energy of incoming radiation have been measured. Extended X-ray Absorption Fine Structure (EXAFS) spectra were taken from diluted samples simulating proteins with nickel. C1 SLAC,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. STANFORD UNIV,DEPT CHEM,STANFORD,CA 94305. EG&G ENERGY MEASUREMENTS INC,GOLETA,CA 93117. RP IWANCZYK, JS (reprint author), XSIRIUS INC,MARINA DEL REY,CA 90292, USA. NR 10 TC 7 Z9 8 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1275 EP 1280 DI 10.1109/23.173190 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400015 ER PT J AU DRAKE, G FREI, D HAHN, SR NELSON, CA SEGLER, SL STUERMER, W AF DRAKE, G FREI, D HAHN, SR NELSON, CA SEGLER, SL STUERMER, W TI THE UPGRADED CDF FRONT END ELECTRONICS FOR CALORIMETRY SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC ID SYSTEM AB The front and electronics used in the calorimetry of the detector at the Collider Detector at Fermilab (CDF) has been upgraded to meet system requirements for higher expected luminosity. A fast digitizer utilizing, a 2 muSec, 16 bit analog-to-digital converter (ADC) has been designed and built. Improvements to the front end trigger circuitry have been implemented, including the production of 900 new front end modules. Operational experience with the previous system is presented, with discussion of the problems and performance goals. RP DRAKE, G (reprint author), FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1281 EP 1285 DI 10.1109/23.173191 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400016 ER PT J AU WINTENBERG, AL BRITTON, CL ERICSON, MN MAPLES, RA YOUNG, GR AWES, TC AF WINTENBERG, AL BRITTON, CL ERICSON, MN MAPLES, RA YOUNG, GR AWES, TC TI WA80-BGO CALORIMETRY ELECTRONICS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC ID DESIGN AB This paper describes instrumentation designed for BGO scintillator-based calorimetry of particles covering a very wide range of energies (from less than 50 MeV to 50 GeV). The instrumentation was designed to have a measurement accuracy of 0.1% over as much of the energy range as possible so the energy resolution of BGO would be the limiting factor. Two 1.5-cm2 photodiodes were used per 2.5 cm x 2.5 cm x 25 cm BGO crystal. Both a charge-sensitive preamplifier and a pulse processor were developed specifically for the needs of the WA80 experiment. The preamplifier was designed for high detector capacitance (100 to 700 pF), low integral and differential non-linearity and low power consumption (200 mW). The pulse processor is a time-invariant shaping amplifier with integral peak-detect-and-hold and automatic gain selection circuits. The amplifier uses quasi-triangular shaping with 4 mus peaking time, and the hold circuit is gated with a fast first level trigger. The preamplifier and pulse processor combination has more than 20 bits of effective resolution when used with an external 12-bit ADC. An array of BGO instrumented with 100 preamplifiers and pulse processors was used in beam tests at CERN. Preliminary results from those tests are presented. RP WINTENBERG, AL (reprint author), OAK RIDGE NATL LAB,POB 2008,MS 6006,OAK RIDGE,TN 37831, USA. NR 6 TC 3 Z9 3 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1286 EP 1291 DI 10.1109/23.173192 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400017 ER PT J AU ANGSTADT, RG CHASE, BE FELLENZ, BJ JOHNSON, ME MARTIN, MI MATULIK, MS SAEWERT, GW UTES, MJ DEGROOT, DC AF ANGSTADT, RG CHASE, BE FELLENZ, BJ JOHNSON, ME MARTIN, MI MATULIK, MS SAEWERT, GW UTES, MJ DEGROOT, DC TI A WORKING, VME-BASED, 106MHZ FADC DATA ACQUISITION-SYSTEM FOR THE TRACKING DETECTORS AT D0 SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC AB A data acquisition system for the tracking detectors of the D0 Colliding Detector has been built and is operational, taking cosmic. ray data. It is composed of 8200 channels of 106MHz 8-bit Flash Analog to Digital Converters (FADC). These are configured as sixteen channels per FADC Module, up to sixteen FADC Modules per crate, and a total of thirty-six 9U VME crates. A crate controller module, the control system interface, and a high speed data buffer/driver complete the FADC crate. Design and operation details are described. C1 NORTHWESTERN UNIV,DEPT ELECT ENGN & COMP SCI,EVANSTON,IL 60201. RP ANGSTADT, RG (reprint author), FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 6 TC 3 Z9 3 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1297 EP 1301 DI 10.1109/23.173194 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400019 ER PT J AU BRITTON, CL KENNEDY, EJ TODD, RA WINTENBERG, AL YOUNG, GR AF BRITTON, CL KENNEDY, EJ TODD, RA WINTENBERG, AL YOUNG, GR TI A 4-CHANNEL BIPOLAR MONOLITHIC PREAMPLIFIER FOR RHIC DIMUON PAD READOUT SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC ID DETECTORS AB This paper presents a four-channel, low power-consumption bipolar monolithic preamplifier designed to amplify signals from pads with detector capacitance values from 10 pF to 50 pF used in a RHIC (Relativistic Heavy Ion Collider) dimuon experiment. The circuit utilizes a folded-cascode topology with a novel feedforward compensation that improves the low-capacitance transient response and provides self-biasing without resorting to bandgap or current references. The circuit was fabricated by Harris Semiconductor in the VHF dielectrically isolated complementary bipolar process. Measured data for gamma irradiation to 1.25 MRad are presented. C1 UNIV TENNESSEE,KNOXVILLE,TN 37996. RP BRITTON, CL (reprint author), OAK RIDGE NATL LAB,DIV INSTRUMENTAT & CONTROLS,OAK RIDGE,TN 37831, USA. NR 6 TC 4 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1302 EP 1306 DI 10.1109/23.173195 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400020 ER PT J AU TURKO, BT SMITH, RC AF TURKO, BT SMITH, RC TI A PRECISION TIMING DISCRIMINATOR FOR HIGH-DENSITY DETECTOR SYSTEMS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC AB Most high resolution time measurement techniques require discriminators that accurately mark the time arrival of events regardless of their intensity. Constant fraction discriminators or zero-crossing discriminators are generally used. We describe a zero-crossing discriminator that accurately determines the peak of a quasi-Gaussian waveform by differentiating it and detecting the resulting zero-crossing. Basically, it consists of a fast voltage comparator and two integrating networks: an RC section and an LR section used in a way that keeps the input impedance purely resistive. A time walk of 100 ps in an amplitude range exceeding 100:1 has been achieved for wave-forms from 1.5 ns to 15 ns FWHM. An arming level discriminator is added to eliminate triggering by noise. Easily implemented in either monolithic or hybrid technology, the circuit is suitable for large multichannel detector systems where size and power dissipation are crucial. Circuit diagrams and typical measured data are also presented. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP TURKO, BT (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 4 TC 22 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1311 EP 1315 DI 10.1109/23.173197 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400022 ER PT J AU HALBIG, JK BOURRET, SC COLLINSWORTH, PR HANSEN, WJ KRICK, MS AF HALBIG, JK BOURRET, SC COLLINSWORTH, PR HANSEN, WJ KRICK, MS TI RECENT DEVELOPMENTS IN MULTIPLICITY COUNTING HARDWARE AT LOS-ALAMOS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC ID NEUTRON AB This paper describes a prototype, 256-channel neutron-multiplicity-counting circuit. It is being used with a 4-MHz shift-register-based neutron coincidence circuit. We developed both circuits. They mount in a double-wide nuclear instrument module. C1 LOS ALAMOS NATL LAB,SAFEGUARDS ASSAY GRP,N-1,LOS ALAMOS,NM 87544. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1326 EP 1330 DI 10.1109/23.173200 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400025 ER PT J AU FULLWOOD, R LOFARO, R SAMANTA, P AF FULLWOOD, R LOFARO, R SAMANTA, P TI RELIABILITY ASSURANCE FOR REGULATION OF ADVANCED REACTORS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC AB The advanced nuclear power plants must achieve higher levels of safety than the first generation of plants. Showing that this is indeed true provides new challenges to reliability and risk assessment methods in the analysis of the designs employing passive and semi-passive protection. Reliability assurance of the advanced reactor systems is important for determining the safety of the design and for determining the plant operability. Safety is the primary concern, but operability is considered indicative of good and safe operation, This paper discusses several concerns for reliability assurance of the advanced design encompassing reliability determination, level of detail required in advanced reactor submittals, data for reliability assurance, systems interactions and common cause effects, passive component reliability, PRA-based configuration control system, and inspection, training, maintenance and test requirements. Suggested approaches are provided for addressing each of these topics. RP FULLWOOD, R (reprint author), BROOKHAVEN NATL LAB,DEPT NUCL ENERGY,DIV ENGN TECHNOL,UPTON,NY 11973, USA. NR 17 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1357 EP 1362 DI 10.1109/23.173205 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400030 ER PT J AU SISK, DR NICHOLS, LL OLSEN, PC AF SISK, DR NICHOLS, LL OLSEN, PC TI AUTOMATED PHANTOM ASSAY SYSTEM SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC AB This paper describes an automated phantom assay system developed for assaying phantoms spiked with minute quantities of radionuclides. The system includes a computer-controlled linear-translation table that positions the phantom at exact distances from a spectrometer. A multichannel analyzer (MCA) interfaces with a computer to collect gamma spectral data. Signals transmitted between the controller and MCA synchronize data collection and phantom positioning. Measured data are then stored on disk for subsequent analysis. The automated system allows continuous unattended operation and ensures reproducible results. RP SISK, DR (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1371 EP 1373 DI 10.1109/23.173208 PN 1 PG 3 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400033 ER PT J AU WILKERSON, J EDBERG, TK HURLEY, K LIN, RP PARSONS, A SADOULET, B WEISS, S SMITH, G AF WILKERSON, J EDBERG, TK HURLEY, K LIN, RP PARSONS, A SADOULET, B WEISS, S SMITH, G TI DEVELOPMENT OF THE WAVE-SHIFTER FIBER READOUT FOR SIGHT SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC ID SCINTILLATION DRIFT CHAMBERS AB The wave-shifter fiber readout for the gas scintillation drift chamber to be used in the hard X-ray telescope SIGHT is described. We present results of light attenuation studies and technical details of handling the fibers in a high pressure environment. Techniques for coupling optical fibers to photomultiplier tubes in a manner that increases both the quantum efficiency and response uniformity of the tubes are detailed. C1 UNIV CALIF BERKELEY,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP WILKERSON, J (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,SPACE SCI LAB,BERKELEY,CA 94720, USA. RI Parsons, Ann/I-6604-2012 NR 9 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1384 EP 1388 DI 10.1109/23.173211 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400036 ER PT J AU MCGARRAH, DB WILLIAMSON, W KEETON, SC AF MCGARRAH, DB WILLIAMSON, W KEETON, SC TI SIMULATION OF THE EFFECT OF ENERGETIC ION RADIATION ON SILICON SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC ID ELECTRON BACKSCATTERING; ELASTIC-SCATTERING; CROSS-SECTIONS; ATOMS AB A three dimensional computer simulation of the interaction of various heavy ion cosmic rays with silicon is presented. The initial ion strike is modeled by the Classical Trajectory Monte Carlo algorithm. Primary electrons produced by the CTMC code, along with their position and momenta, are entered into a non-relativistic Monte Carlo electron transport program. Both elastic and inelastic scattering events are considered in the simulation of the secondary electron cascade. Inelastic collisions include ionization of all shells. A prediction is made of the quantity and distribution of charge generated within silicon due to the cosmic ray ion strike C1 UNIV TOLEDO,TOLEDO,OH 43606. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP MCGARRAH, DB (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. NR 20 TC 3 Z9 3 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1401 EP 1406 DI 10.1109/23.173214 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400039 ER PT J AU DICKERMAN, CE DOERNER, RC REGIS, JP RHODES, EA STANDFORD, GS TRAVIS, DJ DEVOLPI, A AF DICKERMAN, CE DOERNER, RC REGIS, JP RHODES, EA STANDFORD, GS TRAVIS, DJ DEVOLPI, A TI NEW RADIATION HODOSCOPE DEVELOPMENTS FOR ARMS-CONTROL TREATY VERIFICATION SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC AB New developments in hodoscope radiation detection technology offer a wide range of unique capabilities for arms control treaty verification (ACTV) applications. Originally developed for civilian nuclear power research by Argonne National Laboratory, this concept uses an array of radiation detectors to image or detect objects inside opaque containments. Hodoscope systems may detect neutrons and/or gamma-rays. The systems may be based on transmission of radiation through the objects, may detect radiation stimulated in the objects, or may detect intrinsic object radiation. ACTV hodoscopes do not require the high-speed data acquisition systems or the heavy shielding and collimation of reactor hodoscopes, and relatively weak radiation sources are sufficient. We have performed laboratory measurements to demonstrate a range of potential applications. Gamma-ray transmission hodoscopes can be used to inspect canisters, rail cars, etc. to monitor objects such as rocket motors. The use of relatively weak isotopic radiation sources makes it unnecessary to employ expensive and high-intensity accelerators. The heavy metal of nuclear warheads is characterized by strong gamma-ray absorption, and these materials could be counted by low-resolution tomography. Absorbers located in line with objects will themselves be detected, and sources located in the object region will be subtracted out as background. Intrinsic gamma-ray radiation from warheads also can be detected in a passive-instrument mode. Neutron hodoscopes can utilize neutron transmission, intrinsic neutron emission, or neutron-producing reactions (either prompt or delayed) stimulated by a neutron source. Monitoring of rocket motors enclosed in canisters/rail cars is the focus of the most recent ACTV hodoscope research and development activities. RP DICKERMAN, CE (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1417 EP 1421 DI 10.1109/23.173217 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400042 ER PT J AU CAFFREY, AJ COLE, JD GEHRKE, RJ GREENWOOD, RC AF CAFFREY, AJ COLE, JD GEHRKE, RJ GREENWOOD, RC TI CHEMICAL WARFARE AGENT AND HIGH EXPLOSIVE IDENTIFICATION BY SPECTROSCOPY OF NEUTRON-INDUCED GAMMA-RAYS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC AB A non-destructive assay method to identify chemical warfare (CW) agents and high explosive (HE) munitions was tested with actual chemical agents and explosives at the Tooele Army Depot, Tooele, Utah, from 22 April 1991 through 3 May 1991. The assay method exploits the gamma radiation produced by neutron interactions inside a container or munition to identify the elemental composition of its contents. The characteristic gamma-ray signatures of the chemical elements chlorine, phosphorus, and sulfur were observed from the CW agent containers and munitions, in sufficient detail to enable us to reliably discern agents GB [sarin], HD [mustard gas], and VX from one another, and from HE-filled munitions. By detecting of the presence of nitrogen, the key indicator of explosive compounds, and the absence of elements Cl, P, and S, HE shells were also clearly identified. RP CAFFREY, AJ (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. RI Caffrey, Augustine/C-2005-2009 NR 7 TC 22 Z9 22 U1 1 U2 7 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1422 EP 1426 DI 10.1109/23.173218 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400043 ER PT J AU ZEMAN, HD MOULIN, HR AF ZEMAN, HD MOULIN, HR TI REMOVAL OF HARMONIC ARTIFACTS FROM SYNCHROTRON RADIATION CORONARY ANGIOGRAMS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC ID X-RAYS; DETECTOR AB Intravenous coronary angiograms of human subjects are now available from the National Synchrotron Light Source (NSLS) at Brookhaven National Laboratory (BNL). The high (4.4 T) magnetic field used under normal operation of the superconducting wiggler magnet on the X-17 beam line at NSLS yields a high critical energy (18.7 keV) and a large harmonic contamination of the desired X-ray flux at the K-edge of iodine (33.169 keV). The 66 and 99 keV contamination is a factor of 2.29 and 5.32 worse than for the human angiograms taken at the Stanford Synchrotron Radiation Laboratory (SSRL), where a critical energy of 13.0 keV obtained at beam line IV-2. This increased harmonic contamination produces severe artifacts in the images, especially where the patients ribs cross the left ventricle and aorta, which are filled with contrast agent. An algorithm has been developed which can remove these artifacts by solving the two simultaneous transcendental equations for the fractional X-ray transmissions through iodine and through water. The parameters are derived from measurements on a Lucite step-wedge phantom. Human angiograms taken at 4.4 T are shown before and after the correction algorithm is applied. These corrected angiograms are compared to uncorrected angiograms taken at 3.0 T. C1 BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP ZEMAN, HD (reprint author), UNIV TENNESSEE CTR HLTH SCI,DEPT BIOMED ENGN,MEMPHIS,TN 38163, USA. RI Elleaume, Helene/F-2554-2013 NR 14 TC 8 Z9 8 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1431 EP 1437 DI 10.1109/23.173220 PN 1 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400045 ER PT J AU CHANEY, RC FENYVES, EJ HAMMACK, H NELSON, G ANDERSON, JA ANTICH, PP ATAC, M AF CHANEY, RC FENYVES, EJ HAMMACK, H NELSON, G ANDERSON, JA ANTICH, PP ATAC, M TI TESTING OF THE SPATIAL-RESOLUTION AND EFFICIENCY OF SCINTILLATING FIBER PET MODULES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1991 NUCLEAR SCIENCE SYMP AND MEDICAL IMAGING CONF ( NSS / MIUC ) CY NOV 02-09, 1991 CL SANTA FE, NM SP IEEE, NUCL & PLASMA SCI SOC AB Two experimental PET camera modules were constructed using (1) two 5 x 5 x 2.5 cm3 detector stacks made of parallel 0.5 and 1.0 mm diameter scintillating fibers and (2) two 5 x 5 x 5 cm3 detector stacks made of alternating x and y layers of 0.5 and 1.0 mm diameter scintillating fibers. Each stack was viewed by Hamamatsu R2486 position sensitive photomultipliers. The time resolution of the coincidence system was 10 nsec. The spatial resolution and efficiency of the PET modules was tested using an approximately 1 muci 0.5 mm diameter Na-22 source. The best results were achieved with the 1.0 mm parallel fiber stacks: 2.0 mm spatial resolution (FWHM) and 2.3 % efficiency. Possibilities to improve the characteristics of this arrangement and, particularly, the alternating x and y layer stacks are discussed. C1 UNIV TEXAS,SW MED CTR,DALLAS,TX 75235. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP CHANEY, RC (reprint author), UNIV TEXAS,POB 830688,RICHARDSON,TX 75083, USA. NR 2 TC 5 Z9 5 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1992 VL 39 IS 5 BP 1472 EP 1474 DI 10.1109/23.173226 PN 1 PG 3 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JZ684 UT WOS:A1992JZ68400051 ER PT J AU ZABAR, Z BIRENBAUM, L CHEO, BR JOSHI, PN SPAGNOLO, A AF ZABAR, Z BIRENBAUM, L CHEO, BR JOSHI, PN SPAGNOLO, A TI A DETECTOR TO IDENTIFY A DEENERGIZED FEEDER AMONG A GROUP OF LIVE ONES SO IEEE TRANSACTIONS ON POWER DELIVERY LA English DT Article; Proceedings Paper CT 1992 WINTER MEETING OF THE INSULATED CONDUCTORS COMMITTEE OF THE POWER ENGINEERING SOC OF IEEE CY JAN 26-30, 1992 CL NEW YORK, NY SP IEEE, POWER ENGN SOC, INSULATED CONDUCTORS COMM AB A portable device is described for field use by an electric utility that would identify a de-energized feeder from among a group of live ones. The method is based upon the presence of mechanical vibrations at double the line frequency in live cables. In the paper are described briefly the fundamental physical laws and some details of the electronic circuit that processes the signals picked up by the vibration sensor. A prototype was tested on the underground distribution system in New York City. The results are presented and suggest the applicability of the detecting device. C1 CONSOLIDATED EDISON CO NY,NEW YORK,NY 10003. BROOKHAVEN NATL LAB,DEPT ACCELERATOR DEV,UPTON,NY 11973. RP ZABAR, Z (reprint author), POLYTECH INST NEW YORK,ELECT ENGN,333 JAY ST,BROOKLYN,NY 11201, USA. NR 6 TC 4 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0885-8977 J9 IEEE T POWER DELIVER JI IEEE Trans. Power Deliv. PD OCT PY 1992 VL 7 IS 4 BP 1820 EP 1824 DI 10.1109/61.156984 PG 5 WC Engineering, Electrical & Electronic SC Engineering GA JN857 UT WOS:A1992JN85700022 ER PT J AU BEL, Y JACOBSON, KB SILVA, FJ FERRE, J AF BEL, Y JACOBSON, KB SILVA, FJ FERRE, J TI DEVELOPMENTAL AND BIOCHEMICAL-STUDIES ON THE PHENYLALANINE HYDROXYLATION SYSTEM IN DROSOPHILA-MELANOGASTER SO INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY LA English DT Article DE DROSOPHILA-MELANOGASTER; DEVELOPMENT; PHENYLALANINE HYDROXYLASE; TETRAHYDROBIOPTERIN; TETRAHYDROPTERIN ID SEPIAPTERIN REDUCTASE; BIOSYNTHESIS AB The enzyme phenylalanine hydroxylase, the substrate phenylalanine, the product of the reaction tyrosine, and the probable in vivo cofactors (6R)-L-erytro-5,6,7,8-tetrahydrobiopterin (H-4 Bip) and 5,6,7,8-tetrahydropterin (H-4 Ptr), have been measured during development in Drosophila. The developmental profile of phenylalanine hydroxylase activity shows two peaks. The larger occurs at the time of pupation, coinciding with an important accumulation of tyrosine in the insect. The minor peak appears at the time of adult emergence. The developmental profile of H-4 Bip shows also two peaks, coinciding with those of maximal phenylalanine hydroxylase activity. However, H-4 Ptr is only detectable after late pupa, with a small peak at adult emergence. The results of the analyses of the phenylalanine hydroxylase activity in vitro showed that H-4 Bip is a better cofactor than H-4 Ptr, based on the difference in V(max) (4-5 times) and in K(m) for phenylalanine (1.6 times). Moreover, the difference in activity of the enzyme with H-4 Bip related to that with H-4 Ptr, increases even more when larvae are reared on phenylalanine-supplemented media (40-fold difference in V(max). Also, the inhibition of H-4 Bip synthesis with N-acetylserotonin resulted in an increase of phenylalanine. As in most other organisms studied, our results indicate that H-4 Bip is by far the preferred natural cofactor for the Drosophila phenylalanine hydroxylase. C1 UNIV VALENCIA,FAC BIOL,DEPT GENET,E-46100 BURJASSOT,SPAIN. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. RI Bel, Yolanda/I-2700-2015; Ferre, Juan/L-9426-2014; OI Bel, Yolanda/0000-0002-6367-9220; Ferre, Juan/0000-0001-5535-0612; Silva, Francisco J./0000-0002-6911-6541 NR 26 TC 9 Z9 10 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0965-1748 J9 INSECT BIOCHEM MOLEC JI Insect Biochem. Mol. Biol. PD OCT PY 1992 VL 22 IS 7 BP 633 EP 638 DI 10.1016/0965-1748(92)90041-C PG 6 WC Biochemistry & Molecular Biology; Entomology SC Biochemistry & Molecular Biology; Entomology GA JQ962 UT WOS:A1992JQ96200003 ER PT J AU SHADID, JN ECKERT, ERG AF SHADID, JN ECKERT, ERG TI VISCOUS HEATING OF A CYLINDER WITH FINITE LENGTH BY A HIGH-VISCOSITY FLUID IN STEADY LONGITUDINAL FLOW .2. NON-NEWTONIAN CARREAU MODEL FLUIDS SO INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER LA English DT Article AB The viscous dissipation heating of a finite length cylinder exposed to a steady uniform velocity non-Newtonian fluid has been analyzed numerically. The solution determines the elliptic, velocity and temperature fields of a high viscosity non-Newtonian Carreau model fluid about an axisymmetric cylinder. With polymer processing in mind, Part I of this study [E. R. G. Eckert and J. N. Shadid, Int. J. Heat Mass Transfer 32, 321-334 (1989)] considered the effect of the Reynolds number, Prandtl number, probe radius to length ratio and the ratio of cylinder conductivity to fluid thermal conductivity. This paper extends these results by considering the effect of a temperature-dependent non-Newtonian shear thinning viscosity modeled by a temperature shifted Carreau fluid. Computations were performed for different values of the power law exponent, the Weisenberg number, and the Nahme number. In this study calculations are presented for an adiabatic probe with a radius to length ratio of 2.5 x 10(-2), with the Reynolds and Prandtl numbers taken to be fixed at 10(-3) and 10(8) respectively. The power law exponent is varied from 1.0 (Newtonian) to 0.2, the Weisenberg number varies from 0 (Newtonian) to 10(4), and the Nahme number between 0 and 10(4). The results determine the increase in the cylinder wall and tip temperature due to viscous frictional heating. Strong elliptic effects on the velocity extend over 100 radius lengths upstream from the cylinder. As expected the shear thinning behavior of the non-Newtonian viscosity is found to decrease the magnitude of the viscous dissipation heating of the probe surface. In contrast, the effect of the temperature dependence of viscosity described by the Nahme number is found to have a relatively small influence on the cylinder tip temperature. C1 UNIV MINNESOTA,DEPT MECH ENGN,MINNEAPOLIS,MN 55455. RP SHADID, JN (reprint author), SANDIA NATL LABS,DIV PARALLEL COMP SCI,ALBUQUERQUE,NM 87185, USA. NR 9 TC 8 Z9 8 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0017-9310 J9 INT J HEAT MASS TRAN JI Int. J. Heat Mass Transf. PD OCT PY 1992 VL 35 IS 10 BP 2739 EP 2749 DI 10.1016/0017-9310(92)90114-8 PG 11 WC Thermodynamics; Engineering, Mechanical; Mechanics SC Thermodynamics; Engineering; Mechanics GA JV957 UT WOS:A1992JV95700040 ER PT J AU STRADLING, GN GRAY, SA ELLENDER, M MOODY, JC HODGSON, A PEARCE, M WILSON, I BURGADA, R BAILLY, T LEROUX, YGP ELMANOUNI, D RAYMOND, KN DURBIN, PW AF STRADLING, GN GRAY, SA ELLENDER, M MOODY, JC HODGSON, A PEARCE, M WILSON, I BURGADA, R BAILLY, T LEROUX, YGP ELMANOUNI, D RAYMOND, KN DURBIN, PW TI THE EFFICACIES OF 3,4,3-LIHOPO AND DTPA FOR ENHANCING THE EXCRETION OF PLUTONIUM AND AMERICIUM FROM THE RAT - COMPARISON WITH OTHER SIDEROPHORE ANALOGS SO INTERNATIONAL JOURNAL OF RADIATION BIOLOGY LA English DT Article ID SEQUESTERING AGENTS; PURE LICAM(C); INHALATION; ACTINIDES; LIGANDS; NITRATE; PU-238; AM-241; IRON AB With DTPA as a comparison, the siderophore analogue code named 3,4,3-LIHOPO has been tested for its ability to remove Pu-238 and Am-241 from rats after their inhalation or intravenous injection as nitrate. The most effective treatment regimen for inhaled Pu was the repeated administration of 30 mumol kg-1 3,4,3-LIHOPO. By 7 days after exposure, the Pu contents of the lungs and total body were reduced respectively to 2 and 4% of those in untreated animals. These values were six and three times less than when DTPA was administered using the same protocol. For inhaled Am, 3,4,3-LIHOPO and DTPA were considered equally effective, the lung and total body contents being reduced respectively to 13 and 10% of those in controls. Some animals showed slight degenerative changes in the liver and proximal tubules of the kidneys after the repeated administration of 30 mumol kg-1 of 3,4,3-LIHOPO; however these changes were less marked than after DTPA treatment. After the intravenous injection of Pu, the most effective regimen was the single administration of 3 mumol kg-1 3,4,3-LIHOPO. The body content at 7 days was reduced to 7% controls compared with 19% after the repeated administration of 30 mumol kg-1 DTPA. At a dosage of 30 mumol kg-1, 3,4,3-LIHOPO was less effective owing to the higher retention of Pu in the liver. With repeated dosages of 30 mumol kg-1 3,4,3-LIHOPO was more effective than DTPA for the decorporation of Am; the body contents were 16 and 31% of those in controls respectively. Importantly, the body content was still reduced to 28% of control after a single administration of 3 mumol kg-1. The ligand 3,4,3-LIHOPO, which is also superior to other siderophore analogues, could represent a most significant development in the decorporation of Pu and Am. C1 UNIV PARIS 06,CHIM ORGANOELEMENTS LAB,F-75252 PARIS,FRANCE. UNIV PARIS NORD,CHIM STRUCT BIOMOLEC LAB,F-93012 BOBIGNY,FRANCE. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP STRADLING, GN (reprint author), NATL RADIOL PROTECT BOARD,DIDCOT OX11 0RQ,OXON,ENGLAND. NR 18 TC 31 Z9 31 U1 1 U2 3 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0955-3002 J9 INT J RADIAT BIOL JI Int. J. Radiat. Biol. PD OCT PY 1992 VL 62 IS 4 BP 487 EP 497 DI 10.1080/09553009214552381 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 JR945 UT WOS:A1992JR94500013 PM 1357063 ER PT J AU BUCK, O AF BUCK, O TI MATERIALS CHARACTERIZATION AND FLAW DETECTION BY ACOUSTIC NDE SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Article ID INTERNAL-FRICTION; ULTRASONIC-ATTENUATION; ALLOYS; METALS; TRANSFORMATION; PROPAGATION; HYDROGEN; POROSITY; MODULUS AB For many years, researchers have used internal friction to characterize structural inhomogeneities or flaws in a material by using the frequency or temperature dependence of the acoustic loss mechanisms connected with these inhomogeneities. The field of materials characterization and flaw detection by acoustic nondestructive evaluation (NDE) thus has a broad fundamental base. This knowledge base is of great interest in that it is useful for nondestructive characterization and, particularly, to determine the effect of these inhomogeneities on the overall performance of the material. A variety of inhomogeneities can be studied by acoustic NDE, including interstitials, precipitates, dislocations, grains, phase transformations, porosity, and cracks. C1 IOWA STATE UNIV SCI & TECHNOL,MAT SCI & ENGN,AMES,IA 50011. RP BUCK, O (reprint author), AMES LAB,MET & CERAM PROGRAM,AMES,IA, USA. NR 73 TC 5 Z9 6 U1 1 U2 4 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 OCT PY 1992 VL 44 IS 10 BP 17 EP 23 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA JT797 UT WOS:A1992JT79700004 ER PT J AU KROEGER, DM GOYAL, A AF KROEGER, DM GOYAL, A TI CRITICAL CURRENT AND MICROSTRUCTURE IN OXIDE SUPERCONDUCTORS SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Article ID YBA2CU3O7-DELTA GRAIN-BOUNDARIES; HIGH-TEMPERATURE SUPERCONDUCTORS; CURRENT-DENSITY; FLUX CREEP; HIGH-JC; WIRES; Y1BA2CU3O7-DELTA; IRREVERSIBILITY; BICRYSTALS; ANISOTROPY AB Critical current density (J(c)) in the presence of a magnetic field is the property that currently limits many applications of the high-critical-temperature oxide superconductors. Poor current transmission at grain boundaries and weak flux pinning are responsible for the low critical current densities observed in bulk materials. Since 1986, substantial progress has been made both in understanding the microstructural factors affecting J(c) and in developing practical fabrication methods. Much of the fundamental understanding has been obtained from studies of YBa2Cu3O7-x, while the bismuth- and thallium-based compounds appear to offer greater potential as the basis for the first practical conductors. RP KROEGER, DM (reprint author), OAK RIDGE NATL LAB,SUPERCONDUCTING MAT GRP,OAK RIDGE,TN 37831, USA. NR 77 TC 4 Z9 4 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD OCT PY 1992 VL 44 IS 10 BP 42 EP 47 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA JT797 UT WOS:A1992JT79700009 ER PT J AU CIVALE, L WORTHINGTON, TK KRUSINELBAUM, L MARWICK, AD HOLTZBERG, F THOMPSON, JR KIRK, MA WHEELER, R AF CIVALE, L WORTHINGTON, TK KRUSINELBAUM, L MARWICK, AD HOLTZBERG, F THOMPSON, JR KIRK, MA WHEELER, R TI IRRADIATION-ENHANCED PINNING IN YBA2CU3O7-X CRYSTALS SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Article ID METALLIC MATERIALS; RADIATION-DAMAGE; ION IRRADIATION; SUPERCONDUCTIVITY; IRREVERSIBILITY; DEFECTS; FILMS AB Deliberately introducing defects by particle irradiation is an effective way to increase the flux pinning in high-critical-temperature superconductors, which is a requirement for technological applications of these materials. Proton irradiation generates a random distribution of point defects, which largely enhances the critical current in YBa2Cu3O7-x single crystals; but it is not effective in shifting the irreversibility line to higher magnetic fields. The aligned columnar defects created by high-energy heavy-ion irradiation generate even stronger vortex pinning, resulting in higher critical currents at high temperatures and fields and a large displacement of the irreversibility line to higher fields. C1 UNIV TENNESSEE, KNOXVILLE, TN 37996 USA. OAK RIDGE NATL LAB, OAK RIDGE, TN USA. ARGONNE NATL LAB, ARGONNE, IL 60439 USA. RP CIVALE, L (reprint author), IBM CORP, YORKTOWN HTS, NY 10598 USA. NR 32 TC 15 Z9 15 U1 2 U2 4 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 184 THORN HILL RD, WARRENDALE, PA 15086 USA SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD OCT PY 1992 VL 44 IS 10 BP 60 EP 64 PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA JT797 UT WOS:A1992JT79700012 ER PT J AU SPOONER, S AF SPOONER, S TI USING FEDERAL X-RAY, ELECTRON, AND NEUTRON FACILITIES SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Article RP SPOONER, S (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,NEUTRON SCATTERING GRP,OAK RIDGE,TN 37831, USA. NR 4 TC 2 Z9 2 U1 0 U2 1 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 OCT PY 1992 VL 44 IS 10 BP 72 EP 76 PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA JT797 UT WOS:A1992JT79700013 ER PT J AU BARTHES, M ECKERT, J JOHNSON, SW MORET, J SWANSON, BI UNKEFER, CJ AF BARTHES, M ECKERT, J JOHNSON, SW MORET, J SWANSON, BI UNKEFER, CJ TI ANOMALOUS VIBRATIONAL-MODES IN ACETANILIDE AS STUDIED BY INELASTIC NEUTRON-SCATTERING SO JOURNAL DE PHYSIQUE I LA English DT Article ID CRYSTALLINE ACETANILIDE; TEMPERATURE-DEPENDENCE; SOLITONS; SPECTRA AB A study of the anomalous modes in acetanilide and five deuterated derivatives by incoherent inelastic neutron scattering is reported. These data show that the dynamics of the amide and methyl groups influence each other. In addition, the anomalous temperature behaviour of the NH out-of-plane bending mode is confirmed. These observations suggest that the self-trapping mechanism in ACN may be more complex than hitherto assumed. C1 LOS ALAMOS NATL LAB,LANSCE,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,INC4,LOS ALAMOS,NM 87545. RP BARTHES, M (reprint author), UNIV SCI,DYNAM PHASES CONDENSEES GRP,F-34095 MONTPELLIER,FRANCE. NR 18 TC 12 Z9 12 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 1155-4304 J9 J PHYS I JI J. Phys. I PD OCT PY 1992 VL 2 IS 10 BP 1929 EP 1939 PG 11 WC Physics, Multidisciplinary SC Physics GA KB771 UT WOS:A1992KB77100009 ER PT J AU SAVASKAN, G HUH, T EVANS, JW AF SAVASKAN, G HUH, T EVANS, JW TI FURTHER-STUDIES OF A ZINC AIR CELL EMPLOYING A PACKED-BED ANODE .1. DISCHARGE SO JOURNAL OF APPLIED ELECTROCHEMISTRY LA English DT Article AB The zinc-air cell employing a packed bed anode, described previously [2], has been the subject of further investigation. A 76 cm2 (air electrode area) laboratory cell has been used to determine cell performance under a varying load corresponding to the Simplified Federal Urban Driving Schedule. The results were then used as a basis for the conceptual design of a 55 kW (peak power) battery. Projected specific energy of the battery was 110 Wh kg-1 and projected specific power 97 W kg-1 under SFUDS discharge. These values were increased to 228 Wh kg-1 and 97 W kg-1 when capacity is important and to 101 Wh kg-1 and 150 W kg-1 when power is important, based on the results of discharge experiments at 45-degrees-C. Preliminary experiments were carried out to determine the long term stability of the air electrode in this application, to measure self discharge of the zinc and to test the practicality of mechanically recharging the cell. C1 PUSAN NATL UNIV,DEPT MET ENGN,PUSAN,SOUTH KOREA. RP SAVASKAN, G (reprint author), LAWRENCE BERKELEY LAB,DEPT MAT SCI & MINERAL ENGN,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 7 TC 17 Z9 18 U1 0 U2 6 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0021-891X J9 J APPL ELECTROCHEM JI J. Appl. Electrochem. PD OCT PY 1992 VL 22 IS 10 BP 909 EP 915 DI 10.1007/BF01024138 PG 7 WC Electrochemistry SC Electrochemistry GA JQ896 UT WOS:A1992JQ89600002 ER PT J AU HUH, T SAVASKAN, G EVANS, JW AF HUH, T SAVASKAN, G EVANS, JW TI FURTHER-STUDIES OF A ZINC AIR CELL EMPLOYING A PACKED-BED ANODE .2. REGENERATION OF ZINC PARTICLES AND ELECTROLYTE BY FLUIDIZED-BED ELECTRODEPOSITION SO JOURNAL OF APPLIED ELECTROCHEMISTRY LA English DT Article AB Fluidized bed zinc electrodeposition appears to be an efficient way of regenerating zinc particles and electrolyte from the discharge products of the cell described in Part 1. Using a laboratory cell, various electrode materials were examined to determine their suitability for this electrodeposition. The effects of current density and zincate concentration on the performance of the cell were determined. The lowest d.c. electrical energy consumption achieved was 1.92 kWh kg-1 of zinc at 1000 A m-2 superficial current density. The corresponding figure at 2000 A m-2 was 2.08 kWh kg-1. Combining these values with the results of Part I, the 'roundtrip' electrical energy efficiencies of a system employing the cell of Part I for discharge, and fluidized bed electrodeposition for recharge, are 50% and 46%, respectively. C1 LAWRENCE BERKELEY LAB,DEPT MAT SCI & MINERAL ENGN,DIV MAT SCI,BERKELEY,CA 94720. PUSAN NATL UNIV,DEPT MET ENGN,PUSAN,SOUTH KOREA. NR 21 TC 14 Z9 16 U1 1 U2 2 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0021-891X J9 J APPL ELECTROCHEM JI J. Appl. Electrochem. PD OCT PY 1992 VL 22 IS 10 BP 916 EP 921 DI 10.1007/BF01024139 PG 6 WC Electrochemistry SC Electrochemistry GA JQ896 UT WOS:A1992JQ89600003 ER PT J AU LESSNER, PM MCLARNON, FR WINNICK, J CAIRNS, EJ AF LESSNER, PM MCLARNON, FR WINNICK, J CAIRNS, EJ TI AQUEOUS POLYSULFIDE FLOW-THROUGH ELECTRODES - EFFECTS OF ELECTROCATALYST AND ELECTROLYTE-COMPOSITION ON PERFORMANCE SO JOURNAL OF APPLIED ELECTROCHEMISTRY LA English DT Article ID POLYSULFIDE SOLUTIONS; CHEMICAL-REACTIONS; POTENTIAL STEP; KINETICS; EQUILIBRIUM AB Porous electrodes are required to achieve satisfactory performance of the aqueous sulphide/polysulphide redox couple in energy conversion and storage applications. A flow cell for testing flow-through porous electrodes was constructed and operated. The effects of electrode material, temperature, flow rate, and electrolyte composition were studied. Catalytic electrode surface layers of Co and MoS2 demonstrated performances which were more than adequate to meet a design goal of 10-20 mA cm-2 at less than 50 mV overpotential. Flow rate variation had only a small effect on the current density-overpotential behaviour, whereas raising the temperature and/or adding dimethylformamide to the electrolyte had much larger effects. These observations are consistent with steady-state results obtained on rotating disc electrodes. C1 LAWRENCE BERKELEY LAB,DIV APPL SCI,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 25 TC 24 Z9 27 U1 0 U2 13 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0021-891X J9 J APPL ELECTROCHEM JI J. Appl. Electrochem. PD OCT PY 1992 VL 22 IS 10 BP 927 EP 934 DI 10.1007/BF01024141 PG 8 WC Electrochemistry SC Electrochemistry GA JQ896 UT WOS:A1992JQ89600005 ER PT J AU YU, KM KAMINSKA, M LILIENTALWEBER, Z AF YU, KM KAMINSKA, M LILIENTALWEBER, Z TI CHARACTERIZATION OF GAAS-LAYERS GROWN BY LOW-TEMPERATURE MOLECULAR-BEAM EPITAXY USING ION-BEAM TECHNIQUES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID GALLIUM-ARSENIDE AB The stoichiometry, crystallinity, defect concentration, and the excess As lattice location in GaAs layers grown by molecular beam epitaxy at low growth temperatures (less-than-or-equal-to 300-degrees-C) were studied using ion beam techniques. The excess As concentration in the layers was measured by particle induced x-ray emission and was found to increase as the growth temperature was lowered. Excess As concentrations up to 1.5 at. % were measured in layers grown at 190-degrees-C. After annealing at temperatures higher than 400-degrees-C under As overpressure, the excess As atoms coalesce to form As precipitates as revealed by transmission electron microscopy. Ion channeling on the unannealed layers grown at 200-degrees-C revealed that they have good crystalline quality with a large fraction of the excess As atoms sitting at interstitial sites close to the normal As sites in the lattice. The rest of the excess As atoms are believed to be in an As(Ga) antisite position. C1 UNIV WARSAW,INST EXPTL PHYS,PL-00681 WARSAW,POLAND. RP YU, KM (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,CTR ADV MAT,BERKELEY,CA 94720, USA. RI Yu, Kin Man/J-1399-2012; Liliental-Weber, Zuzanna/H-8006-2012 OI Yu, Kin Man/0000-0003-1350-9642; NR 22 TC 69 Z9 70 U1 1 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 1 PY 1992 VL 72 IS 7 BP 2850 EP 2856 DI 10.1063/1.351538 PG 7 WC Physics, Applied SC Physics GA JT007 UT WOS:A1992JT00700042 ER PT J AU HSU, WL AF HSU, WL TI GAS-PHASE KINETICS DURING MICROWAVE PLASMA-ASSISTED DIAMOND DEPOSITION - IS THE HYDROCARBON PRODUCT DISTRIBUTION DICTATED BY NEUTRAL-NEUTRAL INTERACTIONS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; LOW-PRESSURE; GROWTH; HYDROGEN; METHANE; DISCHARGE; DECOMPOSITION; ENVIRONMENT; FILMS AB The mole fractions of H, H-2, CH3, CH4, and C2H2 that were generated in a microwave plasma under conditions typical for diamond deposition are reported. When the methane percentage in the feed gas was < 1%, the measured concentrations were surprisingly similar to those reported for a hot-filament system operated under nearly identical conditions. However, as the methane percentage was increased beyond 1%, a noticeable deviation from the hot-filament results became apparent. In the hot-filament case, surface-induced dissociation of hydrogen on the filament surface was significantly inhibited at this high methane level and lead to a pronounced reduction of the H-atom concentration. But, in the microwave system where dissociation is a homogeneous process, no such reduction was observed. Other observations were: (i) The acetylene concentration scaled as the square of the methyl concentration; (ii) The CH4 + H <--> CH3 + H-2 reaction was found to be at the same level of nonequilibrium as in the hot-filament case. These results, plus arguments based on general principles of plasma chemistry, are taken as indications that the hydrocarbon chemistry in the microwave system is as strongly dictated by neutral-neutral reactions as in a thermal system. The primary effect of the plasma is perhaps its role in dissociating hydrogen molecules to H atoms without having to raise the gas temperature significantly. RP HSU, WL (reprint author), SANDIA NATL LABS, LIVERMORE, CA 94550 USA. NR 45 TC 101 Z9 102 U1 0 U2 2 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 1 PY 1992 VL 72 IS 7 BP 3102 EP 3109 DI 10.1063/1.351470 PG 8 WC Physics, Applied SC Physics GA JT007 UT WOS:A1992JT00700082 ER PT J AU SANCHEZ, JE MCKNELLY, LT MORRIS, JW AF SANCHEZ, JE MCKNELLY, LT MORRIS, JW TI SLIT MORPHOLOGY OF ELECTROMIGRATION INDUCED OPEN CIRCUIT FAILURES IN FINE LINE CONDUCTORS SO JOURNAL OF APPLIED PHYSICS LA English DT Note ID FILM CONDUCTORS; INTERCONNECTION; STRESS; DAMAGE AB Detailed transmission and scanning electron microscopic images of electromigration-induced open circuit failures are presented for fine line aluminum alloy thin film interconnects. A characteristic slit open circuit, similar to stress migration open circuits in narrow interconnects, is shown for various film compositions, processing, and deposition conditions. It is suggested that slit failure morphology is more generally observed for low (almost-equal-to 1) ratios of conductor line width to film grain size. The slit failures observed often occur near copper rich precipitates. The morphology of several slit voids suggests that they are transgranular across the linewidth, consistent with other recent reports of electromigration induced damage in single crystal interconnects. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. NR 24 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 1 PY 1992 VL 72 IS 7 BP 3201 EP 3203 DI 10.1063/1.351484 PG 3 WC Physics, Applied SC Physics GA JT007 UT WOS:A1992JT00700098 ER PT J AU ERNST, A BLACK, T CAI, YP PANOFF, JM TIWARI, DN WOLK, CP AF ERNST, A BLACK, T CAI, YP PANOFF, JM TIWARI, DN WOLK, CP TI SYNTHESIS OF NITROGENASE IN MUTANTS OF THE CYANOBACTERIUM ANABAENA SP STRAIN PCC-7120 AFFECTED IN HETEROCYST DEVELOPMENT OR METABOLISM SO JOURNAL OF BACTERIOLOGY LA English DT Article ID ESCHERICHIA-COLI; FIXATION GENES; CLONING SITES; VARIABILIS; DIFFERENTIATION; VECTORS; COMPLEMENTATION; IDENTIFICATION; MUTAGENESIS; EXPRESSION AB Mutants of Anabaena sp. strain PCC 7120 that are incapable of sustained growth with air as the sole source of nitrogen were generated by using Tn5-derived transposons. Nitrogenase was expressed only in mutants that showed obvious morphological signs of heterocyst differentiation. Even under rigorously anaerobic conditions, nitrogenase was not synthesized in filaments that were unable to develop heterocysts. These results suggest that competence to synthesize nitrogenase requires a process that leads to an early stage of visible heterocyst development and are consistent with the idea that synthesis of nitrogenase is under developmental control (J. Elhai and C. P. Wolk, EMBO J. 9:3379-3388, 1990). We isolated mutants in which differentiation was arrested at an intermediate stage of heterocyst formation, suggesting that differentiation proceeds in stages; those mutants, as well as mutants with aberrant heterocyst envelopes and a mutant with defective respiration, expressed active nitrogenase under anaerobic conditions only. These results support the idea that the heterocyst envelope and heterocyst respiration are required for protection of nitrogenase from inactivation by oxygen. In the presence of air, such mutants contained less nitrogenase than under anaerobic conditions, and the Fe-protein was present in a posttranslationally modified inactive form. We conclude that internal partial oxygen pressure sufficient to inactivate nitrogenase is insufficient to repress synthesis of the enzyme completely. Among mutants with an apparently intact heterocyst envelope and normal respiration, three had virtually undetectable levels of dinitrogenase reductase under all conditions employed. However, three others expressed oxygen-sensitive nitrogenase activity, suggesting that respiration and a barrier to diffusion of gases may not suffice for oxygen protection of nitrogenase in these mutants; two of these mutants reduced acetylene to ethylene and ethane. C1 MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824. NR 47 TC 96 Z9 99 U1 0 U2 1 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0021-9193 J9 J BACTERIOL JI J. Bacteriol. PD OCT PY 1992 VL 174 IS 19 BP 6025 EP 6032 PG 8 WC Microbiology SC Microbiology GA JP644 UT WOS:A1992JP64400004 PM 1328150 ER PT J AU BENNING, C SOMERVILLE, CR AF BENNING, C SOMERVILLE, CR TI IDENTIFICATION OF AN OPERON INVOLVED IN SULFOLIPID BIOSYNTHESIS IN RHODOBACTER-SPHAEROIDES SO JOURNAL OF BACTERIOLOGY LA English DT Article ID RABBIT SKELETAL-MUSCLE; DNA-POLYMERASE; SEQUENCE; PROTEIN; GLYCOGENIN; GENE AB Two new mutants of Rhodobacter sphaeroides deficient in sulfolipid accumulation were isolated by directly screening mutagenized cell tines for polar lipid composition by thin-layer chromatography of lipid extracts. A genomic clone which complemented the mutations in these two lines, but not the previously described sulfolipid-deficient sqdA mutant, was identified. Sequence analysis of the relevant region of the clone revealed three, in tandem open reading frames, designated sqdB, ORF2, and sqdC. One of the mutants was complemented by the sqdB gene, and the other was complemented by the sqdC gene. Insertional inactivation of sqdB also inactivated sqdC, indicating that sqdB and sqdC are cotranscribed. The N-terminal region of the 46-kDa putative protein encoded by the sqdB gene showed slight homology to UDP-glucose epimerase from various organisms. The 30-kDa putative protein encoded by ORF2 showed very striking homology to rabbit muscle glycogenin, a UDP-glucose utilizing, autoglycosylating glycosyltransferase. The 26-kDa putative protein encoded by the sqdC gene was not homologous to any protein of known function. RP BENNING, C (reprint author), MICHIGAN STATE UNIV,MSU DOE PLANT RES LAB,E LANSING,MI 48824, USA. RI Somerville, Christopher/A-4048-2009 OI Somerville, Christopher/0000-0003-4647-0094 NR 32 TC 49 Z9 53 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0021-9193 J9 J BACTERIOL JI J. Bacteriol. PD OCT PY 1992 VL 174 IS 20 BP 6479 EP 6487 PG 9 WC Microbiology SC Microbiology GA JT530 UT WOS:A1992JT53000021 PM 1400200 ER PT J AU SRINIVASAN, S DATYE, AK PEDEN, CHF AF SRINIVASAN, S DATYE, AK PEDEN, CHF TI THE MORPHOLOGY OF OXIDE-SUPPORTED MOS2 SO JOURNAL OF CATALYSIS LA English DT Note ID RESOLUTION ELECTRON-MICROSCOPY; MOLYBDENA-ALUMINA CATALYSTS; HYDRODESULFURIZATION CATALYSTS; SILICA C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP SRINIVASAN, S (reprint author), UNIV NEW MEXICO,DEPT CHEM & NUCL ENGN,ALBUQUERQUE,NM 87131, USA. OI Peden, Charles/0000-0001-6754-9928; Datye, Abhaya/0000-0002-7126-8659 NR 15 TC 53 Z9 63 U1 0 U2 5 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9517 J9 J CATAL JI J. Catal. PD OCT PY 1992 VL 137 IS 2 BP 513 EP 522 DI 10.1016/0021-9517(92)90179-L PG 10 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA JP880 UT WOS:A1992JP88000022 ER PT J AU SMYTH, MJ RUNNELS, B WHARTON, W AF SMYTH, MJ RUNNELS, B WHARTON, W TI CHOLERA-TOXIN POTENTIATES TPA-INDUCED MITOGENESIS AND C-FOS EXPRESSION IN BALB/C-3T3-DERIVED PROADIPOCYTES SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Article ID EPIDERMAL GROWTH-FACTOR; MYC MESSENGER-RNA; CYCLIC-AMP; DNA-SYNTHESIS; CALCIUM IONOPHORE; BALB-C-3T3 CELLS; SWISS 3T3-CELLS; TUMOR PROMOTER; ANTISENSE RNA; 3T3 CELLS AB Treatment of quiescent density-arrested A31T6 proadipocytes with medium supplemented with either 12-O-tetradecanoylphorbol-13-acetate (TPA), insulin, or cholera toxin alone did not stimulate G0/G1 traverse and initiation of DNA synthesis. Combinations of either TPA and cholera toxin or insulin and cholera toxin caused a small stimulation of proliferation. Addition of medium supplemented with TPA and insulin caused a marked stimulation of cell cycle traverse which was significantly potentiated by the coaddition of cholera toxin. The actions of cholera toxin were mimicked by forskolin. Expression of c-fos was regulated in a manner that reflected the results of the mitogenic experiments. TPA caused a marked induction of expression, while only a small increase in transcript levels was seen after treatment with cholera toxin. Addition of a combination of cholera toxin and TPA caused a synergistic induction of c-fos expression. The model system described in this paper allows a detailed analysis of the regulation, by independent second messenger systems, of the transcription of a gene in a mitogenically relevant manner. C1 UNIV NEW MEXICO,SCH MED,DEPT PATHOL,ALBUQUERQUE,NM 87131. RP SMYTH, MJ (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,LS-1,MS M888,LOS ALAMOS,NM 87545, USA. FU NCRR NIH HHS [P41-RR0315] NR 46 TC 5 Z9 5 U1 0 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD OCT PY 1992 VL 50 IS 2 BP 210 EP 218 DI 10.1002/jcb.240500211 PG 9 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA JR907 UT WOS:A1992JR90700010 PM 1331128 ER PT J AU BRENNER, DK ANDERSON, EW LYNN, S PRAUSNITZ, JM AF BRENNER, DK ANDERSON, EW LYNN, S PRAUSNITZ, JM TI LIQUID LIQUID EQUILIBRIA FOR SATURATED AQUEOUS-SOLUTIONS OF SODIUM-SULFATE PLUS 1-PROPANOL, 2-PROPANOL, OR 2-METHYLPROPAN-2-OL SO JOURNAL OF CHEMICAL AND ENGINEERING DATA LA English DT Article AB Liquid-liquid equilibria were determined for ternary systems containing sodium sulfate, water, and a polar organic solvent. Three solvents were studied: 1-propanol, 2-propanol, and 2-methylpropan-2-ol (tert-butyl alcohol). In the salt-saturated two-phase region, data were obtained in the temperature range between the lower consolute temperature and 80-degrees-C. In the one-phase region, the solubility of sodium sulfate was measured at 20 and 25-degrees-C at different solvent/water ratios. C1 LAWRENCE BERKELEY LAB,DEPT CHEM ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. NR 3 TC 19 Z9 21 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0021-9568 J9 J CHEM ENG DATA JI J. Chem. Eng. Data PD OCT PY 1992 VL 37 IS 4 BP 419 EP 422 DI 10.1021/je00008a011 PG 4 WC Thermodynamics; Chemistry, Multidisciplinary; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA JT985 UT WOS:A1992JT98500011 ER PT J AU RARD, JA AF RARD, JA TI ISOPIESTIC INVESTIGATION OF WATER ACTIVITIES OF AQUEOUS NICL2 AND CUCL2 SOLUTIONS AND THE THERMODYNAMIC SOLUBILITY PRODUCT OF NICL2.6H2O AT 298.15-K SO JOURNAL OF CHEMICAL AND ENGINEERING DATA LA English DT Article ID BI-UNIVALENT COMPOUNDS; OSMOTIC COEFFICIENTS; CHLORIDE SOLUTIONS; EVALUATED ACTIVITY; 25-DEGREES-C; ELECTROLYTES; EQUILIBRIUM; 25DEGREESC; COPPER(II); MNCL2 AB Isopiestic vapor-pressure experiments have been performed for aqueous solutions of high-purity NiCl2 from 1.4382 to 5.7199 mol.kg-1 (supersaturated) at 298.15 K. The resulting osmotic coefficients were combined with published isopiestic data to yield recommended values of a(w), phi, and gamma+/-. Similarly, the solubility of NiCl2.6H2O(cr) was determined by this method, and combined with literature values to yield the molal thermodynamic solubility product K(m)-degrees = 1108+/-19. Isopiestic experiments were also performed for aqueous solutions of high-purity CuCl2, but the isopiestic molality ratio exhibited hysteresis due to gradual loss of HCl from the CuCl2 solutions, for experiments done with both degassed and air-filled chambers. The water activity of a saturated solution in equilibrium with CuCl2.2H2O(cr) was determined to be a(w)(satd) = 0.680 75 +/-0.000 08. RP RARD, JA (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,LIVERMORE,CA 94550, USA. NR 35 TC 13 Z9 13 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0021-9568 J9 J CHEM ENG DATA JI J. Chem. Eng. Data PD OCT PY 1992 VL 37 IS 4 BP 433 EP 442 DI 10.1021/je00008a014 PG 10 WC Thermodynamics; Chemistry, Multidisciplinary; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA JT985 UT WOS:A1992JT98500014 ER PT J AU WU, M NORTHRUP, FJ SEARS, TJ AF WU, M NORTHRUP, FJ SEARS, TJ TI STUDY OF RENNER-TELLER, SPIN-ORBIT, AND FERMI-RESONANCE INTERACTIONS IN (X)OVER-TILDE 2-PI(V1V2O) LEVELS OF NCO BY STIMULATED-EMISSION PUMPING SPECTROSCOPY SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID HYPERFINE-INDUCED BREAKDOWN; VIBRONIC ENERGY-LEVELS; EXCITED BENDING LEVELS; J SELECTION RULE; MICROWAVE SPECTROSCOPY; STATES; FLUORESCENCE; DEGENERATE; NCO(X2-PI); PARAMETERS AB We report extensive measurements of rovibronic levels in the 020/100 and 040/120/200 Fermi-resonant polyads of NCO. The levels were accessed by the technique of stimulated emission pumping spectroscopy in a supersonic free jet expansion following excitation of bands in the A2SIGMA+-X2PI spectrum of the radical. The data were analyzed in terms of an effective Hamiltonian which explicitly included reference to all the possible vibronic levels of 2PI symmetry in the polyad under consideration. The effects of levels outside these were treated by perturbation theory. The model was successful in fitting the data close to the experimental measurement precision and the resulting parameters were interpreted in terms of the harmonic and anharmonic vibrational terms. The effective Renner-Teller coupling parameter in NCO varied with vibrational level; however, parameters describing the Fermi-resonance interaction were found to be constant for all the levels investigated. RP WU, M (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. RI Sears, Trevor/B-5990-2013 OI Sears, Trevor/0000-0002-5559-0154 NR 33 TC 29 Z9 30 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 OCT 1 PY 1992 VL 97 IS 7 BP 4583 EP 4595 DI 10.1063/1.463861 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JR338 UT WOS:A1992JR33800001 ER PT J AU FRYDMAN, L CHINGAS, GC LEE, YK GRANDINETTI, PJ EASTMAN, MA BARRALL, GA PINES, A AF FRYDMAN, L CHINGAS, GC LEE, YK GRANDINETTI, PJ EASTMAN, MA BARRALL, GA PINES, A TI VARIABLE-ANGLE CORRELATION SPECTROSCOPY IN SOLID-STATE NUCLEAR-MAGNETIC-RESONANCE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CHEMICAL-SHIFT-ANISOTROPY; MAGIC-ANGLE; NMR-SPECTROSCOPY; SPECTRA; AXIS AB We describe here a new solid-state nuclear-magnetic-resonance (NMR) experiment for correlating anisotropic and isotropic chemical shifts of inequivalent nuclei in powdered samples. Spectra are obtained by processing signals arising from a spinning sample, acquired in independent experiments as a function of the angle between the axis of macroscopic rotation and the external magnetic field. This is in contrast to previously proposed techniques, which were based on sudden mechanical flippings or multiple-pulse sequences. We show that the time evolution of variable-angle-spinning signals is determined by a distribution relating the isotropic frequencies of the spins with their corresponding chemical shift anisotropies. Fourier transformation of these data therefore affords a two-dimensional NMR spectrum, in which line shapes of isotropic and anisotropic interactions are correlated. Theoretical and experimental considerations involved in the extraction of this spectral information are discussed, and the technique is illustrated by an analysis of C-13 NMR anisotropy in glycine, cysteine, and p-anisic acid. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI Grandinetti, Philip/F-1084-2010 OI Grandinetti, Philip/0000-0003-0102-316X NR 28 TC 99 Z9 100 U1 0 U2 10 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 1 PY 1992 VL 97 IS 7 BP 4800 EP 4808 DI 10.1063/1.463860 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JR338 UT WOS:A1992JR33800022 ER PT J AU FISHER, ER KICKEL, BL ARMENTROUT, PB AF FISHER, ER KICKEL, BL ARMENTROUT, PB TI COLLISION-INDUCED DISSOCIATION AND CHARGE-TRANSFER REACTIONS OF SFX+ (X=1-5) - THERMOCHEMISTRY OF SULFUR FLUORIDE IONS AND NEUTRALS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID KINETIC-ENERGY DEPENDENCE; MOLECULE REACTIONS; CROSS-SECTIONS; BEAM TECHNIQUE; BOND-ENERGIES; GAS-PHASE; SF6; SILICON; PLASMA; IONIZATION AB Guided ion beam mass spectrometry is used to measure the cross sections for collision-induced dissociation of SF(x)+ (x = 1-5) with Xe. The energy dependences of the cross sections are analyzed to give the following 0 K bond dissociation energies (BDEs): D-degrees-(SF4+-F) = 4.60 +/- 0.10 eV, D-degrees-(SF3+-F) =0.36 +/- 0.05 eV, D-degrees-(SF2+-F) =4.54 +/- 0.08 eV, D-degrees-(SF+-F) =4.17 +/- 0.10 eV, and D-degrees-(S+-F) =3.56 +/- 0.05 eV. The ionization energies, IE(SF) = 10.16 +/- 0.17 eV, IE(SF3)=8.18 +/- 0.07 eV, IE(SF4)=11.69 +/- 0.06 eV, and IE(SF5)=9.60 +/- 0.05 eV, are also measured from analysis of endothermic charge-transfer reactions. From these BDEs and IEs, we derive heats of formation for the sulfur fluoride ions and neutrals that provide a self-consistent set of thermochemical data for the sulfur fluoride species. In some cases, the thermochemical values determined here are considerably different from available literature values. These differences are discussed in detail. C1 UNIV UTAH,DEPT CHEM,SALT LAKE CITY,UT 84112. RP FISHER, ER (reprint author), SANDIA NATL LABS,DIV 1812,ALBUQUERQUE,NM 87185, USA. NR 76 TC 109 Z9 109 U1 1 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 1 PY 1992 VL 97 IS 7 BP 4859 EP 4870 DI 10.1063/1.463840 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JR338 UT WOS:A1992JR33800028 ER PT J AU KRESS, JD HAYES, EF AF KRESS, JD HAYES, EF TI ASSIGNMENT OF PEAKS IN PHOTODETACHMENT SPECTRA USING PREDICTED DENSITIES OF REACTIVE STATES - APPLICATION TO H2F AND DF2 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID POTENTIAL-ENERGY SURFACE; MECHANICAL REACTION PROBABILITIES; CUMULATIVE REACTION PROBABILITIES; DISCRETE VARIABLE REPRESENTATION; INTEGRAL CROSS-SECTIONS; SCATTERING CALCULATIONS; CONVERGED QUANTUM; F+H-2 REACTION; S-MATRIX; SPECTROSCOPY AB Accurate cumulative reaction probabilities and densities of reactive states have been obtained for the reactions F + H2 --> H + HF and F + D2 --> D + DF using the hyperspherical (APH) coordinate scattering method developed by Pack and Parker. Results for scattering energies ranging from threshold to 0.7 eV above threshold have been obtained using two different potential energy surfaces that have been proposed for this system. The predicted peaks in the densities of reactive states are due to the presence of scattering resonances. The characteristic steps in the cumulative reaction probabilities are used to identify the resonance peaks due to quantized dynamical bottlenecks. The trapped-state or Feshbach-type resonances are identified by narrow oscillations in the density of reactive states. The positions of these resonance peaks in the density of reactive states are in good agreement with the peaks in the Franck-Condon factors for the photodetachment of H2F- and D2F-. Significant changes in resonance types are found for the T5a and 5SEC potential energy surfaces for H2F. While the assignment of resonance peaks presented is in reasonable agreement with the assignments suggested by Hahn and Taylor based on their classical mechanical analysis, there are some differences that will require further study. C1 OHIO STATE UNIV,DEPT CHEM,COLUMBUS,OH 43210. RP KRESS, JD (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,T-12 HS B268,LOS ALAMOS,NM 87545, USA. NR 38 TC 13 Z9 13 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 OCT 1 PY 1992 VL 97 IS 7 BP 4881 EP 4889 DI 10.1063/1.463842 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JR338 UT WOS:A1992JR33800030 ER PT J AU CYR, DR CONTINETTI, RE METZ, RB OSBORN, DL NEUMARK, DM AF CYR, DR CONTINETTI, RE METZ, RB OSBORN, DL NEUMARK, DM TI FAST BEAM STUDIES OF NCO FREE-RADICAL PHOTODISSOCIATION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID FLIGHT MASS-SPECTROMETER; OPTICAL DOUBLE-RESONANCE; MICROWAVE SPECTROSCOPY; FERMI RESONANCE; VIBRONIC STATES; MOLECULAR-BEAM; GAS-PHASE; FLUORESCENCE; EXCITATION; SPECTRUM AB The spectroscopy and dissociation dynamics of the NCO radical have been investigated by applying fast radical beam photodissociation spectroscopy to the B2PI <-- X2PI electronic transition. Measurements of the photodissociation cross section as a function of dissociation wavelength show that even the lowest vibrational levels of the B2PI state predissociate. Analysis of fragment kinetic energy release reveals that the spin-forbidden N (4S) + CO(1SIGMA+) products are produced exclusively until 20.3 kcal/mol above the origin, at which point, the spin-allowed N(2D) + CO product channel becomes energetically accessible. The spin-allowed channel dominates above this threshold. By determining the location of this threshold, we obtain a new DELTAH(f)0 for NCO of 30.5 +/- 1 kcal/mol, several kcal/mol lower than the previously accepted value. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF SAN DIEGO,DEPT CHEM,LA JOLLA,CA 92093. RP CYR, DR (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. RI Osborn, David/A-2627-2009; Metz, Ricardo/E-8856-2010; Neumark, Daniel/B-9551-2009; OI Neumark, Daniel/0000-0002-3762-9473; Metz, Ricardo/0000-0003-1933-058X; Continetti, Robert/0000-0002-0685-4459 NR 66 TC 61 Z9 62 U1 1 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 1 PY 1992 VL 97 IS 7 BP 4937 EP 4947 DI 10.1063/1.463989 PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JR338 UT WOS:A1992JR33800036 ER PT J AU ZHANG, BL WANG, CZ HO, KM XU, CH CHAN, CT AF ZHANG, BL WANG, CZ HO, KM XU, CH CHAN, CT TI THE GEOMETRY OF SMALL FULLERENE CAGES - C-20 TO C-70 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CARBON CLUSTERS; C-60; STABILITY; C60 AB The ground-state structures of small fullerenes below C70 were determined by tight-binding molecular-dynamics total energy optimization. An efficient simulated annealing scheme was used to generate closed, hollow, spheroidal cage structures for all even-numbered carbon clusters from C20 to C70. As a general trend, fullerenes prefer geometries which separate the pentagonal rings as far apart as possible. Except for C60, C70, and C50, most fullerenes have relatively low symmetries. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP ZHANG, BL (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 30 TC 124 Z9 130 U1 2 U2 15 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 1 PY 1992 VL 97 IS 7 BP 5007 EP 5011 DI 10.1063/1.463854 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JR338 UT WOS:A1992JR33800044 ER PT J AU LYNCH, DL RICK, SW GOMEZ, MA SPATH, BW DOLL, JD PRATT, LR AF LYNCH, DL RICK, SW GOMEZ, MA SPATH, BW DOLL, JD PRATT, LR TI SPECTROSCOPIC STUDIES OF SURFACE AND SUBSURFACE HYDROGEN METAL SYSTEMS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID EMBEDDED-ATOM-METHOD; MOLECULAR-DYNAMICS; NICKEL; PD(111); RESONANCES; ADSORPTION; DISORDER; SPECTRA; ORDER; NI AB Recent experiments on the H/Ni(111) system have demonstrated that high-resolution electron-energy-loss spectra of subsurface absorbate species can be observed. We report here molecular-dynamics simulations for both the H/Ni(111) and H/Pd(111) systems. The necessary atomic forces are obtained from embedded atom method (EAM) potentials. From such calculations we have obtained the power spectra and compare our results to the available experimental data. These calculations reasonably reproduce the observed shifts upon embedding the H subsurface and we comment on the possibility of subsurface absorbates interfering with surface adsorbate assignments. Lastly, we illustrate the sensitivity of our results to the parametrization of the EAM potential. C1 BROWN UNIV,DEPT CHEM,PROVIDENCE,RI 02912. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP LYNCH, DL (reprint author), THINKING MACHINES CORP,245 1ST ST,CAMBRIDGE,MA 02142, USA. RI Pratt, Lawrence/H-7955-2012 OI Pratt, Lawrence/0000-0003-2351-7451 NR 31 TC 16 Z9 16 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 1 PY 1992 VL 97 IS 7 BP 5177 EP 5181 DI 10.1063/1.463816 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JR338 UT WOS:A1992JR33800065 ER PT J AU OHARE, PAG SUSMAN, S VOLIN, KJ ROWLAND, SC AF OHARE, PAG SUSMAN, S VOLIN, KJ ROWLAND, SC TI COMBUSTION CALORIMETRY OF RHOMBOHEDRAL SULFUR IN FLUORINE - A QUESTION OF IMPURITIES - THE STANDARD MOLAR ENTHALPIES OF FORMATION OF SF6(G) AND SO(4)2-(AQ) AT THE TEMPERATURE 298.15-K SO JOURNAL OF CHEMICAL THERMODYNAMICS LA English DT Article C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. ANDREWS UNIV,DEPT PHYS,BERRIEN SPRINGS,MI 49104. RP OHARE, PAG (reprint author), NATL INST STAND & TECHNOL,DIV CHEM KINET & THERMODYNAM,GAITHERSBURG,MD 20899, USA. NR 23 TC 23 Z9 23 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0021-9614 J9 J CHEM THERMODYN JI J. Chem. Thermodyn. PD OCT PY 1992 VL 24 IS 10 BP 1009 EP 1017 DI 10.1016/S0021-9614(05)80011-4 PG 9 WC Thermodynamics; Chemistry, Physical SC Thermodynamics; Chemistry GA JQ400 UT WOS:A1992JQ40000001 ER PT J AU PHILLIPS, TJ AF PHILLIPS, TJ TI AN APPLICATION OF A SIMPLE COUPLED OCEAN ATMOSPHERE MODEL TO THE STUDY OF SEASONAL CLIMATE PREDICTION SO JOURNAL OF CLIMATE LA English DT Article ID NORTH PACIFIC-OCEAN; SEA-SURFACE TEMPERATURE; GENERAL-CIRCULATION MODEL; LEVEL PRESSURE ANOMALIES; SOUTHERN OSCILLATION; UNITED-STATES; EL-NINO; GCM SIMULATION; PREDICTABILITY; VARIABILITY AB A 50-year integration of a simple two-layer atmospheric model coupled to a prognostic-depth ocean mixed layer is used for a preliminary exploration of the potential for global climate prediction on seasonal to interannual time scales. Despite a number of quantitative deficiencies, the model simulation permits the investigation of a wider range of climate predictors and predictands than is usually possible from observations: ocean mixed-layer temperature, depth, heat content, and surface heat fluxes are tested as statistical predictors of atmospheric thickness, static stability, and zonal/meridional winds. The field significance of correlations of the atmospheric predictands lagging ocean predictors in different latitude sectors is assessed, and the predictive power and consistency of the ocean variables are determined as a function of time lag, latitude, atmospheric predictand, and season. It is found that the ocean variables demonstrate a modest potential for predicting atmospheric climate at lags up to three seasons, but no more than about 40% of the local variance of an atmospheric field is explained by any ocean predictor. The most powerful predictors are situated in the tropics, while Northern Hemisphere subtropical and midlatitude ocean variables are substantially better predictors than their Southern Hemisphere counterparts. Ocean mixed-layer temperature is the strongest predictor, while the thickness is the most predictable atmospheric field. Spring and autumn ocean variables are most effective, and winter variables least effective, in predicting subsequent atmospheric seasonal states, but the atmosphere is more predictable in summer and winter than in the transitional seasons. The implications of these results for global climate prediction are discussed, and some possible future research priorities are proposed. RP PHILLIPS, TJ (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV ATMOSPHER & GEOPHYS SCI,L-264,LIVERMORE,CA 94550, USA. NR 71 TC 2 Z9 2 U1 1 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8755 J9 J CLIMATE JI J. Clim. PD OCT PY 1992 VL 5 IS 10 BP 1078 EP 1096 DI 10.1175/1520-0442(1992)005<1078:AAOASC>2.0.CO;2 PG 19 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KF433 UT WOS:A1992KF43300003 ER PT J AU FENDORF, SE FENDORF, M SPARKS, DL GRONSKY, R AF FENDORF, SE FENDORF, M SPARKS, DL GRONSKY, R TI INHIBITORY MECHANISMS OF CR(III) OXIDATION BY DELTA-MNO2 SO JOURNAL OF COLLOID AND INTERFACE SCIENCE LA English DT Article ID OXIDE-WATER INTERFACE; ELECTRICAL DOUBLE-LAYER; MANGANESE-DIOXIDE; METAL-IONS; SURFACE; MODEL; CHROMIUM(III); ADSORPTION; CO(II) C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP FENDORF, SE (reprint author), UNIV DELAWARE,DEPT PLANT & SOIL SCI,NEWARK,DE 19717, USA. NR 30 TC 72 Z9 72 U1 3 U2 29 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9797 J9 J COLLOID INTERF SCI JI J. Colloid Interface Sci. PD OCT 1 PY 1992 VL 153 IS 1 BP 37 EP 54 DI 10.1016/0021-9797(92)90296-X PG 18 WC Chemistry, Physical SC Chemistry GA JP477 UT WOS:A1992JP47700005 ER PT J AU OTANI, NF KIM, JS BIRDSALL, CK COHEN, BI NEVINS, WM MARON, N AF OTANI, NF KIM, JS BIRDSALL, CK COHEN, BI NEVINS, WM MARON, N TI ELIMINATION OF VELOCITY SPACE RINGS-AND-SPOKES INSTABILITIES IN MAGNETIZED ELECTROSTATIC PARTICLE SIMULATIONS OF PLASMAS SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article C1 UNIV CALIF BERKELEY,ELECTR RES LAB,BERKELEY,CA 94720. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP OTANI, NF (reprint author), CORNELL UNIV,SCH ELECT ENGN,ITHACA,NY 14853, USA. NR 14 TC 0 Z9 0 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 OCT PY 1992 VL 102 IS 2 BP 227 EP 235 DI 10.1016/0021-9991(92)90368-9 PG 9 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA JT993 UT WOS:A1992JT99300001 ER PT J AU KAZEMINEZHAD, F DAWSON, JM LEBOEUF, JN SYDORA, R HOLLAND, D AF KAZEMINEZHAD, F DAWSON, JM LEBOEUF, JN SYDORA, R HOLLAND, D TI A VLASOV PARTICLE ION ZERO MASS ELECTRON MODEL FOR PLASMA SIMULATIONS SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID CODE C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. RP KAZEMINEZHAD, F (reprint author), UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024, USA. NR 15 TC 12 Z9 12 U1 1 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD OCT PY 1992 VL 102 IS 2 BP 277 EP 296 DI 10.1016/0021-9991(92)90372-6 PG 20 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA JT993 UT WOS:A1992JT99300005 ER PT J AU DUKOWICZ, JK DVINSKY, AS AF DUKOWICZ, JK DVINSKY, AS TI APPROXIMATE FACTORIZATION AS A HIGH-ORDER SPLITTING FOR THE IMPLICIT INCOMPRESSIBLE-FLOW EQUATIONS SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID NAVIER-STOKES EQUATIONS; SEMIIMPLICIT PROJECTION METHODS; CONSISTENT MASS MATRIX; FINITE-ELEMENT METHOD; PRESSURE; IMPLEMENTATION; SCHEME C1 CREARE RES & DEV INC,HANOVER,NH 03755. RP DUKOWICZ, JK (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,GRP T-3,LOS ALAMOS,NM 87545, USA. NR 23 TC 127 Z9 133 U1 1 U2 12 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD OCT PY 1992 VL 102 IS 2 BP 336 EP 347 DI 10.1016/0021-9991(92)90376-A PG 12 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA JT993 UT WOS:A1992JT99300009 ER PT J AU PAULSEN, MD ORNSTEIN, RL AF PAULSEN, MD ORNSTEIN, RL TI PREDICTING THE PRODUCT SPECIFICITY AND COUPLING OF CYTOCHROME P450CAM SO JOURNAL OF COMPUTER-AIDED MOLECULAR DESIGN LA English DT Article DE ENZYME REDESIGN; PROTEIN SIMULATIONS; PSEUDOMONAS PUTIDA ID MOLECULAR-DYNAMICS SIMULATION; ELECTRON-TRANSFER; HYDROXYLATION; CAMPHOR; 5,5-DIFLUOROCAMPHOR; STEREOCHEMISTRY; PUTIDAREDOXIN; P-450CAM; ACID AB We present an analysis of several molecular dynamics trajectories of substrate-bound cytochrome P450cam. Trajectories were calculated for the native substrate, camphor, as well as for the alternative substrates, norcamphor and thiocamphor. The system modeled consisted of the crystallographically resolved amino acids, the heme group with a single oxygen atom as the distal ligand, the bound substrate, and the crystallographic waters. These trajectories of the presumptive ferryl oxygen intermediate were used to predict regiospecificity of hydroxylation and coupling between NADH consumption and product formation. Simple geometric criteria in combination with electronic considerations were used to calculate the probability of hydroxylation at specific sites on the substrate. We found that for all the cases examined, the predicted product ratios were in good agreement with the experimentally observed values. We also determined that these simple geometric criteria can be used to predict the degree of coupling between NADH consumption and product formation for a given substrate, which was in good agreement with the experimental values. C1 PACIFIC NW LAB, MOLEC SCI RES CTR, MAIL STOP K1-90, RICHLAND, WA 99352 USA. NR 29 TC 59 Z9 59 U1 0 U2 2 PU ESCOM SCI PUBL BV PI LEIDEN PA PO BOX 214, 2300 AE LEIDEN, NETHERLANDS SN 0920-654X J9 J COMPUT AID MOL DES JI J. Comput.-Aided Mol. Des. PD OCT PY 1992 VL 6 IS 5 BP 449 EP 460 DI 10.1007/BF00130396 PG 12 WC Biochemistry & Molecular Biology; Biophysics; Computer Science, Interdisciplinary Applications SC Biochemistry & Molecular Biology; Biophysics; Computer Science GA JX140 UT WOS:A1992JX14000002 PM 1474394 ER PT J AU MCBRIDE, JF SIMMONS, CS CARY, JW AF MCBRIDE, JF SIMMONS, CS CARY, JW TI INTERFACIAL SPREADING EFFECTS ON ONE-DIMENSIONAL ORGANIC LIQUID IMBIBITION IN WATER-WETTED POROUS-MEDIA SO JOURNAL OF CONTAMINANT HYDROLOGY LA English DT Article ID CAPILLARY RISE; OIL; INFILTRATION; TRANSPORT; PRESSURE; KINETICS; SOIL AB The spreading coefficient, C(sp), determines whether an organic immiscible liquid, OIL, will form a lens (C(sp) < 0) or will spread spontaneously (C(sp) > 0) on a water surface. An OIL that forms a lens does not perfectly wet the water surface and therefore has a contact angle greater than 0-degrees. The one-dimensional rate at which an OIL spreads spontaneously on a water surface is proportional to the square root of C(sp). Of the OIL's that pose a contaminant threat to the subsurface, the majority has a non-zero C(sp). To test the influence of such interfacial spreading phenomena on OIL infiltration in a pristine vadose zone, upward OIL and water imbibition infiltration experiments were performed in glass-bead columns, moistened with water, by using OIL's with different C(sp). An analytical model for saturated liquid front rise was used to inversely estimate the effective capillary pressure head at the front and the average liquid conductivity. A nonspreading OIL (C(sp) much less than 0) exhibited a reduced capillary pressure head in the water-wetted glass beads. A spontaneously spreading OIL (C(sp) much greater than 0) manifested an enhanced capillary pressure head. Reduced capillary pressure head was associated with an increase in average conductivity, and enhanced capillary pressure head was associated with a decrease in average conductivity when compared to the average water conductivity during water imbibition. The employed experimental method and mathematical analysis of dynamic flow, subject to interfacial spreading phenomena, are practical for quantifying parameters for use in sharp-front OIL infiltration models, but more research is needed to determine how to incorporate the spreading coefficient in numerical multiphase flow models. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 35 TC 24 Z9 25 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-7722 J9 J CONTAM HYDROL JI J. Contam. Hydrol. PD OCT PY 1992 VL 11 IS 1-2 BP 1 EP 25 DI 10.1016/0169-7722(92)90031-9 PG 25 WC Environmental Sciences; Geosciences, Multidisciplinary; Water Resources SC Environmental Sciences & Ecology; Geology; Water Resources GA JW114 UT WOS:A1992JW11400001 ER PT J AU BILLIA, B JAMGOTCHIAN, H TRIVEDI, R AF BILLIA, B JAMGOTCHIAN, H TRIVEDI, R TI IMPROVED ANALYSIS OF TIP UNDERCOOLING IN CELLULAR SOLIDIFICATION OF A BINARY ALLOY SO JOURNAL OF CRYSTAL GROWTH LA English DT Article ID DIRECTIONAL SOLIDIFICATION; DENDRITIC GROWTH AB Classical expressions for the undercooling, DELTAT, at the tip of a cell during arrayed-directional solidification of a binary alloy, are compared with the experimental data on succinonitrile-acetone alloys. The range of validity of existing cellular models on cell tip undercooling is then determined. It is shown that cellular growth is an intricate situation in which the cell shape and the solute partitioning coefficient need to be properly included in the analysis. An improved analysis of cellular tip undercooling is developed, and the results presented in terms of an intrinsic solutal undercooling, DELTAT(s), and a part, DELTAT(SMI), that is associated with the simultaneous existence of a shape (S) and some morphological instability (MI). C1 US DOE,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. RP BILLIA, B (reprint author), FAC SCI & TECH ST JEROME,PHYS CRISTALLINE LAB,URA 797,CASE 151,F-13397 MARSEILLE 13,FRANCE. NR 17 TC 12 Z9 12 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD OCT PY 1992 VL 123 IS 3-4 BP 399 EP 410 DI 10.1016/0022-0248(92)90600-N PG 12 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA JX167 UT WOS:A1992JX16700009 ER PT J AU SCHNEIDER, RP BRYAN, RP JONES, ED BIEFELD, RM OLBRIGHT, GR AF SCHNEIDER, RP BRYAN, RP JONES, ED BIEFELD, RM OLBRIGHT, GR TI TRIMETHYLAMINE ALANE FOR MOVPE OF ALGAAS AND VERTICAL-CAVITY SURFACE-EMITTING LASER STRUCTURES SO JOURNAL OF CRYSTAL GROWTH LA English DT Article ID GAAS/ALGAAS QUANTUM-WELL; GROWTH; ALXGA1-XAS; GAAS AB The use of trimethylamine alane (TMAAl) as an alternative to trimethylaluminum (TMAl) for low-pressure metalorganic vapor-phase epitaxy (MOVPE) of AlGaAs thin films has been studied in detail. AlGaAs layers were grown in a horizontal reaction chamber at 20-110 mbar with linear flow velocities as high as 3 m/s and growth temperatures in the range 650 less-than-or-equal-to T(g) less-than-or-equal-to 750-degrees-C. Wafer thickness uniformity is acceptable only for the highest linear flow velocities. The 12 K photoluminescence spectra of the layers exhibit intense and narrow bound-exciton emission throughout the growth temperature range investigated. The luminescence linewidths observed are the narrowest to date for MOVPE-grown AlxGa1-xAs with x greater-than-or-equal-to 0.25. To assess the viability of this new source for the growth of advanced optoelectronic devices, several optically-pumped vertical-cavity surface-emitting laser structures were grown using TMAAl extensively. Room temperature lasing at 850 nm was reproducibly obtained, with a threshold pumping power comparable to similar structures grown by molecular beam epitaxy in our laboratories. C1 PHOTON RES INC,BROOMFIELD,CO 80021. RP SCHNEIDER, RP (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 15 TC 6 Z9 6 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD OCT PY 1992 VL 123 IS 3-4 BP 487 EP 494 DI 10.1016/0022-0248(92)90610-U PG 8 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA JX167 UT WOS:A1992JX16700019 ER PT J AU CHEN, FC MURPHY, RW MEI, VC CHEN, GL AF CHEN, FC MURPHY, RW MEI, VC CHEN, GL TI THERMODYNAMIC ANALYSIS OF 4 MAGNETIC HEAT-PUMP CYCLES SO JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME LA English DT Article AB Magnetic heat pumps have been successfully used for refrigeration applications at near absolute-zero-degree temperatures. In these applications, a temperature lift of a few degrees in a cryogenic environment is sufficient and can be easily achieved by a simple magnetic heat-pump cycle. To extend magnetic heat pumping to other temperature ranges and other types of application in which the temperature lift is more than just a few degrees requires more involved cycle processes. The possible cycle applications include cooling of superconducting transmission lines, space conditioning, and industrial heating. This paper investigates the characteristics of a few better-known thermomagnetic heat-pump cycles (Carnot, Ericsson, Stirling, and regenerative) in extended ranges of temperature lift. The regenerative cycle is the most efficient one. Cycle analyses were done for gadolinium operating between 0 and 7 Tesla, and with a heat-rejection temperature of 320 K. The analysis results predicted a 42 percent reduction in coefficient of performance at 260 K cooling temperature and a 15 percent reduction in capacity at 232 K cooling temperature for the magnetic Ericsson cycle as compared with the ideal regenerative cycle. Such substantial penalties indicate that the potential irreversibilities from this one source may adversely affect the viability of certain proposed MHP concepts if the relevant loss mechanisms are not adequately addressed. RP CHEN, FC (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 14 TC 11 Z9 11 U1 0 U2 6 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 OCT PY 1992 VL 114 IS 4 BP 715 EP 720 DI 10.1115/1.2906647 PG 6 WC Engineering, Mechanical SC Engineering GA JV890 UT WOS:A1992JV89000015 ER PT J AU LIU, YN ZHU, JH ZHOU, HJ FOLLANSBEE, PS AF LIU, YN ZHU, JH ZHOU, HJ FOLLANSBEE, PS TI VARIATION OF YIELD STRESS WITH STRAIN RATE FOR 3 CARBON-STEELS SO JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article ID RATE DEFORMATION; LOW-TEMPERATURE; ALLOYS AB This paper presents an experimental study of the strain-rate and temperature dependence of the yield stress for three low carbon steels (percent c = 0.2, 0.3, and 0.4). Tension test results using notched specimens are reported for temperatures of -20-degrees-C, 0-degrees-C, and 25-degrees-C and strain rates from 10(-4) s-1 to 200 s-1. Two regions with different kinetics have been observed. The yield stress shows a low sensitivity to strain-rate at higher temperatures and lower strain rates (region I), but the rate sensitivity is high at lower temperatures and higher strain rates (region II). An approximately linear dependence of yield stress on log strain rate is displayed in both regions. The carbon content of the steel strongly affects strengthening in region I, but weakening appears as the strain rate increases in region II. Deformation in the two regions is analyzed according to standard formalisms. When the yield stress is separated into athermal and thermally activated components, the carbon concentration dependence is shown to isolate to the athermal stress component, which becomes rate controlling at high temperatures and low strain rates. C1 LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. RP LIU, YN (reprint author), JIAOTONG UNIV,DEPT MAT SCI & ENGN,XIAN,PEOPLES R CHINA. NR 18 TC 1 Z9 3 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0094-4289 J9 J ENG MATER-T ASME JI J. Eng. Mater. Technol.-Trans. ASME PD OCT PY 1992 VL 114 IS 4 BP 348 EP 353 PG 6 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA JU981 UT WOS:A1992JU98100002 ER PT J AU TSZENG, TC OHRINER, EK SIKKA, VK AF TSZENG, TC OHRINER, EK SIKKA, VK TI MODELS FOR INELASTIC DEFORMATION OF PARTICLES ASSOCIATED WITH HOT-PRESSING OF METAL MATRIX COMPOSITES SO JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article ID ALUMINUM COMPOSITES; INDENTATION; REINFORCEMENT; SPHERES; HIP AB During fabrication of fiber reinforced metal-matrix composites by hot pressing, fiber breakage due to particles impingement during consolidation of fiber/particle system is very common. In studying the fiber breakage, one of the main issues is the interactions between fibers and particles during consolidation. In this study, we proposed to investigate the problem of fiber/particle interactions by examining a unit problem consisting of a deformable particle and a cylinder. A rather engineering model for axisymmetric deformation of a particle induced by a rigid sphere was developed first and then extended to the interactions between a deformable particle and a rigid cylinder. The calculations were compared with experiments on lead balls, good agreement was observed. The model was then applied to determining the maximum bending stress in fibers using the simple beam theory. A safe criterion for preventing fibers from breaking was found. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. NR 33 TC 5 Z9 5 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0094-4289 J9 J ENG MATER-T ASME JI J. Eng. Mater. Technol.-Trans. ASME PD OCT PY 1992 VL 114 IS 4 BP 422 EP 431 DI 10.1115/1.2904195 PG 10 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA JU981 UT WOS:A1992JU98100013 ER PT J AU KURZ, W TRIVEDI, R AF KURZ, W TRIVEDI, R TI MICROSTRUCTURE AND PHASE SELECTION IN LASER TREATMENT OF MATERIALS SO JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article ID RAPID SOLIDIFICATION AB Microstructure formation during the laser treatment of materials is discussed so as to enable one to design appropriate alloys and laser processing conditions which will produce a microstructure that has optimum properties. In order to predict microstructures for different laser processing conditions, the theoretical models for single phase and two-phase eutectic growth under a wide range of solidification rates have been developed. Specific emphasis is placed on the new physics that become important under rapid solidification conditions of laser processing. Based on these models, the selection of a specific microstructure under given laser processing conditions has been established. These results are then used to construct microstructure/processing condition maps for the laser treatment of materials. These diagrams theoretically predict the variation in the microstructure along the depth of the solidified pool as a function of laser scanning velocity. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. RP KURZ, W (reprint author), SWISS FED INST TECHNOL,DEPT MAT ENGN,CH-1015 LAUSANNE,SWITZERLAND. NR 19 TC 27 Z9 27 U1 2 U2 6 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0094-4289 J9 J ENG MATER-T ASME JI J. Eng. Mater. Technol.-Trans. ASME PD OCT PY 1992 VL 114 IS 4 BP 450 EP 458 DI 10.1115/1.2904198 PG 9 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA JU981 UT WOS:A1992JU98100016 ER PT J AU NOVAK, JM BERTSCH, PM MILLS, GL AF NOVAK, JM BERTSCH, PM MILLS, GL TI C-13 NUCLEAR-MAGNETIC-RESONANCE SPECTRA OF SOIL WATER-SOLUBLE ORGANIC-CARBON SO JOURNAL OF ENVIRONMENTAL QUALITY LA English DT Note ID SUBSTANCES AB Water-soluble organic carbon (WSOC) was extracted from the surface horizon (0-15 cm) of a South Carolina floodplain soil (Pickney series-sandy, silicious, thermic Cumulic Humaquepts) using either 1.2-mum Whatman glass fiber type C (GF) or polycarbonate (PC) (< 0.4 mum) filters. The trend in functional group C distribution for both WSOC fractions was 0-alkyl > aliphatic > aromatic > carboxylic acid > carbonyl structures. Overall, the C-13 NMR spectra showed similar functional group C distributions for fractions obtained with both filters. C1 UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,DIV BIOGEOCHEM,AIKEN,SC 29802. USDA ARS,NATL SOIL TILTH LAB,AMES,IA 50011. NR 10 TC 9 Z9 11 U1 0 U2 4 PU AMER SOC AGRONOMY PI MADISON PA 677 S SEGOE RD, MADISON, WI 53711 SN 0047-2425 J9 J ENVIRON QUAL JI J. Environ. Qual. PD OCT-DEC PY 1992 VL 21 IS 4 BP 537 EP 539 PG 3 WC Environmental Sciences SC Environmental Sciences & Ecology GA JZ316 UT WOS:A1992JZ31600002 ER PT J AU WALTON, BT HENDRICKS, MS ANDERSON, TA GRIEST, WH MERRIWEATHER, R BEAUCHAMP, JJ FRANCIS, CW AF WALTON, BT HENDRICKS, MS ANDERSON, TA GRIEST, WH MERRIWEATHER, R BEAUCHAMP, JJ FRANCIS, CW TI SOIL SORPTION OF VOLATILE AND SEMIVOLATILE ORGANIC-COMPOUNDS IN A MIXTURE SO JOURNAL OF ENVIRONMENTAL QUALITY LA English DT Article ID POLLUTANTS; WATER; MATTER; COEFFICIENTS; EQUILIBRIA; CHEMICALS; SEDIMENTS; TRANSPORT; FATE AB Studies were conducted to evaluate lipophilicity as a predictor of sorption for a mixture of organic compounds with high vapor pressures commonly present at hazardous waste sites. Sorption partition coefficients (K(p)) for the mixture of 16 volatile and semivolatile organic compounds were measured on a Captina silt loam (Typic Fragiudult) and a McLaurin sandy loam (Typic Paleudults) using a zero headspace extractor. The experimental K(p) was determined for acrylonitrile, furan, methyl ethyl ketone, tetrahydrofuran, benzene, toluene, p-xylene, chlorobenzene, chloroform, nitrobenzene, 1,2-dichlorobenzene, 1,2,3-trichloropropane, carbon tetrachloride, ethylene dibromide, 1,2,4,5-tetrachlorobenzene, and hexachlorobenzene on each of the two soils. The K(p) values were generally lower in the McLaurin sandy loam, which had a lower organic C content (0.66 +/- 0.04%) than the Captina silt loam (organic C content = 1.49 +/- 0.06%). Sorption was normalized to soil organic C content of the soil by converting K(p) for each compound and soil to K(oc). Weighted regression analyses of K(oc observed) for the compounds in the mixture on K(oc predicted) from the n-octanol/water partition coefficient (K(ow)) for individual compounds yielded a pooled, weighted regression of K(oc observed) = 1.084 + 0.457 K(oc predicted), n = 29, r = 0.88. Statistical analysis indicated that the slope of 0.457 +/- 0.046 (estimated standard error) was significantly less than 1.00, indicating that soil sorption of nonionic organic compounds differed from that predicted for the same individual compounds based on K(ow). The results indicate that predictive equations for sorption of individual organic compounds can be applied to mixtures of volatile and semivolatile organic compounds in soils when log K(ow) are in a range from approximately 1 to 3; however, outside this range a correction factor may be needed. C1 UNIV TENNESSEE,GRAD PROGRAM ENVIRONM TOXICOL,KNOXVILLE,TN 37901. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,OAK RIDGE,TN 37831. RP WALTON, BT (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. NR 20 TC 22 Z9 22 U1 2 U2 11 PU AMER SOC AGRONOMY PI MADISON PA 677 S SEGOE RD, MADISON, WI 53711 SN 0047-2425 J9 J ENVIRON QUAL JI J. Environ. Qual. PD OCT-DEC PY 1992 VL 21 IS 4 BP 552 EP 558 PG 7 WC Environmental Sciences SC Environmental Sciences & Ecology GA JZ316 UT WOS:A1992JZ31600005 ER PT J AU HOPPER, RW AF HOPPER, RW TI STOKES-FLOW OF A CYLINDER AND HALF-SPACE DRIVEN BY CAPILLARITY SO JOURNAL OF FLUID MECHANICS LA English DT Article ID FREE-SURFACE; PLANE AB The coalescence of a cylinder with half-space by creeping viscous flow driven solely by surface tension is analysed using methods developed previously. The evolution of the shape with time is described, exactly, in terms of a time-dependent mapping function z = OMEGA(zeta, t) of the upper half-plane, conformal on Im zeta greater-than-or-equal-to 0. The results are in closed analytic form except for the time, which requires a quadrature. The height of the figure decays as t-1 as t --> infinity, which is consistent with Kuiken's analysis of an isolated disturbance. (Previously, the author reported an erroneous solution which behaved otherwise.) The results are compared with the coalescence of equal cylinders obtained previously. For a modest degree of coalescence, the shapes are rather alike. In the limit as t --> 0, the time dependence of the minimum widths (necks) are the same. At the times when the minimum widths disappear. the heights of the two shapes are equal. Appended is a note providing a counter-example to earlier conjecture. A simply connected region undergoing this type of flow need not remain so. RP HOPPER, RW (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550, USA. NR 10 TC 37 Z9 39 U1 0 U2 5 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0022-1120 J9 J FLUID MECH JI J. Fluid Mech. PD OCT PY 1992 VL 243 BP 171 EP 181 DI 10.1017/S0022112092002684 PG 11 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA JV770 UT WOS:A1992JV77000009 ER PT J AU WINSKE, D OMIDI, N AF WINSKE, D OMIDI, N TI ELECTROMAGNETIC ION ION-CYCLOTRON INSTABILITY - THEORY AND SIMULATIONS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID SHEET BOUNDARY-LAYER; BAND ELECTROSTATIC NOISE; AURORAL FIELD LINES; EARTHS BOW SHOCK; SLOW MODE SHOCKS; PLASMA SHEET; BEAM INSTABILITIES; ALFVEN WAVES; 2-DIMENSIONAL SIMULATIONS; ACOUSTIC INSTABILITY AB The linear and nonlinear properties of the electromagnetic ion/ion cyclotron (EMIIC) instability are investigated using linear theory and hybrid simulations. The instability is driven by the relative streaming of two field-aligned ion beams. In the electrostatic limit it reduces to the well-known ion beam driven electrostatic ion cyclotron instability, but for finite beta the instability is enhanced and propagates over a broader range of angles with respect to the magnetic field. Linear theory and one-dimensional hybrid simulations are used to study the characteristics of the instability as a function of beam density, angle of propagation (theta), ion beta, ratio of the streaming velocity to the Alfven speed, electron to ion temperature ratio, and other parameters. Generally, the one-dimensional calculations show that the instability behaves like its electrostatic counterpart when theta is near 90-degrees, saturating at low levels by heating the ions in the perpendicular direction. At smaller angles the instability is dominated by electromagnetic effects, large-amplitude waves, and stronger beam coupling. Two-dimensional hybrid simulations show some evidence for coherent effects due to a narrowing of the wave spectrum during the linear growth stage and a more quasi-linearlike heating process in the nonlinear phase, eventually yielding similar asymptotic values for plasma parameters. Applications of the EMIIC instability to upstream and downstream waves and ion dissipation at slow shocks in the magnetotail and to ion heating in the plasma sheet boundary layer are briefly discussed. C1 UNIV CALIF SAN DIEGO,DEPT ELECT & COMP ENGN,LA JOLLA,CA 92093. RP WINSKE, D (reprint author), LOS ALAMOS NATL LAB,DIV APPL THEORET PHYS,LOS ALAMOS,NM 87545, USA. NR 63 TC 40 Z9 40 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 OCT 1 PY 1992 VL 97 IS A10 BP 14779 EP 14799 DI 10.1029/92JA00902 PG 21 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JR009 UT WOS:A1992JR00900001 ER PT J AU OMIDI, N WINSKE, D AF OMIDI, N WINSKE, D TI KINETIC STRUCTURE OF SLOW SHOCKS - EFFECTS OF THE ELECTROMAGNETIC ION ION-CYCLOTRON INSTABILITY SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID QUASI-PARALLEL SHOCKS; MODE SHOCKS; COLLISIONLESS SHOCKS; GEOMAGNETIC TAIL; MAGNETOTAIL; SIMULATIONS; REFLECTION; WAVES AB Using a one-dimensional electromagnetic hybrid code (particle ions, fluid electrons), the structure of and ion heating at slow magnetosonic shocks are investigated in the low beta regime. In particular, the effects of the waves generated at or upstream of the shock by the electromagnetic ion/ion cyclotron (EMIIC) instability are studied. To understand the role of shock initialization and boundary conditions on the resulting solutions, three methods of shock formation are utilized. One is a relaxation method, where the shock is started as a structureless discontinuity and allowed to evolve to a possible steady state solution. It is shown that this method of shock formation can lead to spurious results and therefore is not reliable. The other two investigated methods are similar, in that the shock is formed via flow interactions in a dynamic fashion. One of these is the usual piston method, where the plasma is injected from one side of the simulation box and reflected from the other side. In a new, third method (flow-flow) the plasma is injected from both boundaries, which results in the formation of a pair of slow shocks. Both of these shock formation methods result in reliable solutions. Using the piston or flow-flow interactions, it is found that slow magnetic shocks have a number of different structures depending on the plasma parameters and the shock normal angle. One set of solutions corresponds to the classical structure where a coherent Alfven wave train is formed downstream of the shock. However, Alfven waves generated by the backstreaming ions via the electromagnetic ion/ion cyclotron instability are also observed upstream of the shock. The second class of solutions corresponds to structures with Alfven turbulence upstream and downstream of the shock. These shocks are found to have a nonsteady behavior, due to transport of upstream waves generated by the EMIIC instability into the downstream region. The nonsteady behavior of the shock prevents the formation of a coherent trailing wave train. A third class of structure is associated with much weaker laminar shocks, where little or no wave activity is present both upstream and downstream of the shock. Using the full electromagnetic dispersion equation, it is shown that large linear damping of Alfven or slow waves prevents the formation of a wave train downstream of such shocks. A fourth class of solutions is associated with no wave activity in the downstream but has Alfven waves at and upstream of the shock. The excitation of these waves at the shock leads to a nonsteady behavior, even though their Poynting vector is toward the upstream. By using the average magnetic moment and deviations from its upstream value, the role of the EMIIC instability in ion dissipation has also been investigated. It is shown that ion orbits are adiabatic at weak laminar shocks, leading to anisotropic beating with T(parallel-to) > T(perpendicular-to). On the other hand, when upstream Alfven waves are present, they lead to incident ion scattering before the shock transition region. This scattering, however, does not always lead to complete thermalization immediately downstream of the shock. As such, the length scales associated with the magnetic structure and ion dissipation may vary considerably at slow shocks. C1 UNIV CALIF SAN DIEGO,CALIF SPACE INST,LA JOLLA,CA 92093. LOS ALAMOS NATL LAB,DIV APPL THEORET PHYS,LOS ALAMOS,NM 87545. RP OMIDI, N (reprint author), UNIV CALIF SAN DIEGO,DEPT ELECT & COMP ENGN,LA JOLLA,CA 92093, USA. NR 27 TC 52 Z9 52 U1 1 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 OCT 1 PY 1992 VL 97 IS A10 BP 14801 EP 14821 DI 10.1029/92JA00905 PG 21 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JR009 UT WOS:A1992JR00900002 ER PT J AU BIRN, J YUR, G RAHMAN, HU MINAMI, S AF BIRN, J YUR, G RAHMAN, HU MINAMI, S TI ON THE TERMINATION OF THE CLOSED FIELD LINE REGION OF THE MAGNETOTAIL SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID MAGNETIC-FIELD; MAGNETOSPHERE; RECONNECTION; INTERPLANETARY; SIMULATION AB The structure of the distant magnetotail, where the closed field line region terminates, is investigated in the framework of several models and on the basis of laboratory simulations of the interaction of a flowing magnetized plasma with a dipole field. From our simulations we find that this region for northward "interplanetary" field (IMF) resembles that of a quasi-static tail structure, in which a flaring tail transits into a nonflaring current sheet configuration at a location where the internal pressure is balanced by the external plasma and magnetic pressures only. This structure is associated with a Y-type magnetic neutral line. The magnetic tail apparently includes an open field line region, despite the fact that this magnetosphere did not have a history of southward IMF, which could have opened the dipole field through frontside reconnection. This is a strong indication of the occurrence of high-latitude nightside reconnection, suggested by Dungey (1963). For southward model IMF the closed field line region appears to terminate at an X-type magnetic neutral line, as in the standard open magnetosphere model of Dungey (1961). This configuration is also in qualitative agreement with the simple superposition of a dipole field and a uniform IMF and with the presence of a plasma mantle which expands through drifts from the magnetosphere boundary toward the plasma sheet and becomes partially trapped through magnetic reconnection at the distant X line. C1 UNIV CALIF RIVERSIDE,INST GEOPHYS & PLANETARY PHYS,RIVERSIDE,CA 92502. OSAKA CITY UNIV,DEPT ELECT ENGN,OSAKA 558,JAPAN. RP BIRN, J (reprint author), LOS ALAMOS NATL LAB,MS D438,LOS ALAMOS,NM 87545, USA. NR 21 TC 13 Z9 13 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD OCT 1 PY 1992 VL 97 IS A10 BP 14833 EP 14840 DI 10.1029/92JA01145 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JR009 UT WOS:A1992JR00900004 ER PT J AU DUBOIS, DF HANSSEN, A ROSE, HA AF DUBOIS, DF HANSSEN, A ROSE, HA TI LANGMUIR TURBULENCE AND IONOSPHERIC MODIFICATION - COMMENT SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Editorial Material ID PLASMA-DENSITY DEPLETIONS; PARAMETRIC-INSTABILITIES; HF; EVOLUTION; SPECTRUM C1 UNIV TROMSO,INST MATH & PHYS SCI,N-9000 TROMSO,NORWAY. RP DUBOIS, DF (reprint author), LOS ALAMOS NATL LAB,MAIL STOP B262,LOS ALAMOS,NM 87545, USA. NR 21 TC 13 Z9 13 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD OCT 1 PY 1992 VL 97 IS A10 BP 15059 EP 15066 DI 10.1029/92JA00904 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JR009 UT WOS:A1992JR00900024 ER PT J AU TRIVEDI, N ULLAH, S AF TRIVEDI, N ULLAH, S TI SUPERFLUID-INSULATOR TRANSITION IN DISORDERED BOSON SYSTEMS SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article ID VORTEX-GLASS SUPERCONDUCTIVITY; LOCALIZATION; CRYSTALS; FIELD; PHASE AB We review the localization problem in two dimensions for interacting bosons in a random potential. This problem is intimately related to the study of He-4 adsorbed in porous media, Josephson junction arrays, disordered superconducting films and vortex glasses. Using path integral Monte Carlo techniques, we find a superfluid, a localized or 'Bose glass' insulator with gapless excitations, and (at commensurate densities) a Mott insulator with a finite gap to excitations. C1 JAMES FRANCK INST, CHICAGO, IL 60637 USA. RP TRIVEDI, N (reprint author), ARGONNE NATL LAB, DIV MAT SCI, BLDG 223, ARGONNE, IL 60439 USA. NR 22 TC 5 Z9 5 U1 1 U2 1 PU SPRINGER/PLENUM PUBLISHERS PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD OCT PY 1992 VL 89 IS 1-2 BP 67 EP 77 DI 10.1007/BF00692579 PG 11 WC Physics, Applied; Physics, Condensed Matter SC Physics GA JX946 UT WOS:A1992JX94600008 ER PT J AU MEZEI, F CANFIELD, PC SCHARPF, O AF MEZEI, F CANFIELD, PC SCHARPF, O TI CHANGE OF MAGNETIC SHORT-RANGE ORDER AT METAL-INSULATOR PHASE-TRANSITION SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article AB The wavenumber dependent susceptibility in V5O9 shows that the jump of susceptibility at the metal-insulator transition is not due to antiferromagnetic correlations expected in a Mott insulator but to the onset of ferromagnetic correlations in the metallic phase with a small, intinerant type V moment of 0.6mu(B) in both phases. C1 LOS ALAMOS NATL LAB, MSC, LOS ALAMOS, NM 87545 USA. INST MAX VON LAUE PAUL LANGEVIN, F-38042 GRENOBLE, FRANCE. RP MEZEI, F (reprint author), HAHN MEITNER INST KERNFORSCH BERLIN GMBH, PF 390128, W-1000 BERLIN 39, GERMANY. RI Canfield, Paul/H-2698-2014 NR 4 TC 2 Z9 2 U1 0 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 OCT PY 1992 VL 116 IS 1-2 BP 55 EP 57 DI 10.1016/0304-8853(92)90136-C PG 3 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA JX859 UT WOS:A1992JX85900007 ER PT J AU WU, RQ FREEMAN, AJ AF WU, RQ FREEMAN, AJ TI PROXIMITY EFFECTS OF A CU(001) SUBSTRATE ON THE FERROMAGNETISM OF CO MONOLAYERS AND BILAYERS SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article ID THIN-FILM MAGNETISM; FCC COBALT FILMS; ELECTRONIC-STRUCTURE; SURFACE MAGNETISM; SINGLE-CRYSTAL; WORK FUNCTION; CU(100); OVERLAYERS; GROWTH; ADSORPTION AB Electronic and magnetic properties of mono- and bilayer Co/Cu(001) adsorption systems are studied using full potential linearized augmented plane wave (FLAPW) total energy calculations. The large magnetic moment (2.07mu(B)) of the Co free monolayer is decreased substantially to 1.78mu(B) when adsorbed on the Cu(001) substrate - which is 5% smaller than that (1.87mu(B)) at the clean fcc Co(001) surface. In 2Co/Cu(001), the magnetic moment of the interfacial Co layer drops to 1.50mu(B), even 10% smaller than the bulk value, 1.65mu(B). These large proximity effects indicate that the Cu(001) substrate is harmful for Co overlayer magnetism and thus is not a good substrate for developing and studying 2D magnetism. C1 ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. RP WU, RQ (reprint author), NORTHWESTERN UNIV, DEPT PHYS & ASTRON, EVANSTON, IL 60208 USA. RI Wu, Ruqian/C-1395-2013 OI Wu, Ruqian/0000-0002-6156-7874 NR 45 TC 13 Z9 14 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 EI 1873-4766 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD OCT PY 1992 VL 116 IS 1-2 BP 202 EP 210 DI 10.1016/0304-8853(92)90164-J PG 9 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA JX859 UT WOS:A1992JX85900035 ER PT J AU SALES, BC CHAKOUMAKOS, BC BOATNER, LA RAMEY, JO AF SALES, BC CHAKOUMAKOS, BC BOATNER, LA RAMEY, JO TI STRUCTURAL EVOLUTION OF THE AMORPHOUS SOLIDS PRODUCED BY HEATING CRYSTALLINE MGHPO4.3H2O SO JOURNAL OF MATERIALS RESEARCH LA English DT Note ID LEAD PYROPHOSPHATE; GLASS STATE; NEWBERYITE AB The precise structural characteristics of the amorphous solids that are generated during the dehydration of crystalline MgHPO4 . 3H2O (newberyite) are reported. The results show that a dramatic change in the distribution of phosphate anions (i.e., chains of comer-linked PO4 tetrahedra) occurs during the process of dehydration and that anions up to 13 PO4 tetrahedra in length are formed. The distribution of phosphate anions formed at intermediate stages of the dehydration process was found to be in quantitative agreement with the theory of Parks and Van Wazer. RP SALES, BC (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI Chakoumakos, Bryan/A-5601-2016; Boatner, Lynn/I-6428-2013 OI Chakoumakos, Bryan/0000-0002-7870-6543; Boatner, Lynn/0000-0002-0235-7594 NR 17 TC 5 Z9 5 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 OCT PY 1992 VL 7 IS 10 BP 2646 EP 2649 DI 10.1557/JMR.1992.2646 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA JR170 UT WOS:A1992JR17000003 ER PT J AU MERCHANT, N LUO, JS MARONI, VA GRUEN, DM TANI, BS SINHA, S SANDHAGE, KH CRAVEN, CA AF MERCHANT, N LUO, JS MARONI, VA GRUEN, DM TANI, BS SINHA, S SANDHAGE, KH CRAVEN, CA TI EPITAXIAL-GROWTH OF YBBA2CU3O7-DELTA FILMS ON (100)-ORIENTED MGO AND SRTIO3 SUBSTRATES BY OXIDATION OF A LIQUID ALLOY PRECURSOR SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID BA-CU-O; COMPOUND SYSTEM; SUPERCONDUCTIVITY; YBA2CU3O7-DELTA; OXIDE AB Textured superconducting films of YbBa2Cu3O7-delta were grown on single crystals of MgO (100) and SrTiO3 (100) by oxidation of a liquid alloy precursor. The substrates were coated by dipping them in molten YbBa2Cu3 (m.p. approximately 870-degrees-C). After removal from the melt, the liquid layers on the substrates were oxidized in pure oxygen to form the tetragonal oxide phase, i.e., YbBa2Cu3O7-delta, then annealed at 500-degrees-C to obtain the superconducting orthorhombic phase of the same compound. The microstructure of the films obtained in this way was found to be related to the nature of the substrate as well as to processing variables that included oxidation temperature and oxidation time. Films grown on MgO (100) showed c-axis texture as well as a random growth structure. Films prepared on SrTiO3 (100) Showed either a c-axis texture or a mixture of c-axis and a-axis texture. The superconducting properties of the as-prepared films and the effects of key process parameters.on film quality and microstructure are presented and discussed. C1 UNIV ILLINOIS,CHICAGO,IL 60607. AMER SUPERCONDUCTOR CORP,WATERTOWN,MA 02172. RP MERCHANT, N (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 25 TC 10 Z9 10 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD OCT PY 1992 VL 7 IS 10 BP 2680 EP 2688 DI 10.1557/JMR.1992.2680 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA JR170 UT WOS:A1992JR17000008 ER PT J AU WRIGHT, RN RABIN, BH MCFERRAN, WH AF WRIGHT, RN RABIN, BH MCFERRAN, WH TI COMBUSTION SYNTHESIS OF CUBIC AL3TI ALLOYS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID COMPRESSION BEHAVIOR; PLASTIC-DEFORMATION; L12 COMPOUNDS; ALUMINIDES; ADDITIONS; CR AB Combustion synthesis of elemental powder compacts as been used to produce alloys with compositions corresponding to Al3Ti, Al73Ti24Cr3, and Al67Ti25Cr8. The binary composition exhibits a strong exothermic reaction at approximately 665-degrees-C, resulting in formation of single phase Al3Ti with the tetragonal D0(22) Structure. The heat of formation of the compound at 298 K, DELTAH(f)0(298), was estimated from peak reaction temperature measurements to be -35.0 kJ mol-1. Additions of Cr lowered the reaction initiation temperature and resulted in the formation of intermediate products attributed to Al-Cr reactions. The D0(22) Structure remained the primary reaction product in Cr-containing alloys. The Cr particles did not completely dissolve during initial reaction; an additional heat treatment at 1200-degrees-C or above was required to homogenize the material, resulting in partial or complete transformation of the D0(22) structure to the cubic L1(2) structure, depending upon Cr content. Homogenization at 1250-degrees-C for 4 h produced material consisting approximately of a 50-50% mixture of the D0(22) and L1(2) structures for Al73Ti24Cr3, and 100% L1(2) for Al67Ti25Cr8. In all cases, reaction at ambient pressure was accompanied by swelling, resulting in final densities less than 60% of theoretical. Application of external pressure, either during or subsequent to combustion synthesis, produced near theoretical density materials exhibiting a homogeneous and equiaxed microstructure. RP WRIGHT, RN (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 20 TC 11 Z9 11 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 OCT PY 1992 VL 7 IS 10 BP 2733 EP 2738 DI 10.1557/JMR.1992.2733 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA JR170 UT WOS:A1992JR17000012 ER PT J AU MCKAMEY, CG TORTORELLI, PF DEVAN, JH CARMICHAEL, CA AF MCKAMEY, CG TORTORELLI, PF DEVAN, JH CARMICHAEL, CA TI A STUDY OF PEST OXIDATION IN POLYCRYSTALLINE MOSI2 SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID HIGH-TEMPERATURE AB MoSi2 is a promising high-temperature material with low density (6.3 g/cm3), high melting point (2020-degrees-C), and good oxidation resistance at temperatures to about 1900-degrees-C. However, in the intermediate temperature range between 400 and 600-degrees-C, it is susceptible to a "pest" reaction which causes catastrophic disintegration by a combination of oxidation and fracture. In this study, we have used polycrystalline MoSi2, produced by arc-casting of the pure elements and by cold and hot pressing of alloy powders, to characterize the pest reaction and to determine the roles of composition, grain or phase boundaries, and physical defects on the oxidation and fracture of specimens exposed to air at 500-degrees-C. It was found that pest disintegration occurs through transport of oxygen into the interior of the specimen along pre-existing cracks and/or pores, where it reacts to form MoO3 and SiO2. The internal stress produced during the formation of MoO3 results in disintegration to powder. Near the stoichiometric ratio, the susceptibility to pest disintegration increases with increasing molybdenum content and with decreasing density. Silicon-rich alloys were able to form protective SiO2 and showed no indication of disintegration, even at densities as low as 60%. RP MCKAMEY, CG (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. RI Tortorelli, Peter/E-2433-2011 NR 25 TC 85 Z9 94 U1 1 U2 8 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD OCT PY 1992 VL 7 IS 10 BP 2747 EP 2755 DI 10.1557/JMR.1992.2747 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA JR170 UT WOS:A1992JR17000014 ER PT J AU CHOU, TC NIEH, TG TSUI, TY PHARR, GM OLIVER, WC AF CHOU, TC NIEH, TG TSUI, TY PHARR, GM OLIVER, WC TI MECHANICAL-PROPERTIES AND MICROSTRUCTURES OF METAL CERAMIC MICROLAMINATES .1. NB/MOSI2 SYSTEMS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID COPPER MULTILAYER COMPOSITES; COMPOSITION-MODULATED ALLOYS; ENHANCED TENSILE-STRENGTH; THIN-FILMS; ELASTIC-CONSTANTS; CU/NI SUPERLATTICES; NICKEL; MODULUS; STRAIN; FOILS AB Artificial multilayers, or microlaminates, composed of alternating layers of Nb and MoSi2 of equal thickness were synthesized by d.c., magnetron sputtering. Four different modulation wavelengths, lambda, were studied: 7, 11, 20, and 100 nm. The compositions, periodicities, and microstructures of the microlaminates were characterized by Auger electron spectroscopy and transmission electron microscopy. Structural characterization revealed that the as-deposited Nb layers are polycrystalline, while the MoSi2 layers are amorphous. The hardnesses and elastic moduli of the films were measured using nanoindentation techniques. Neither a supermodulus nor a superhardness effect could be identified in the range of wavelengths investigated; for each of the microlaminates, both the hardness and modulus were found to fall between the bounds set by the properties of the monolithic Nb and MoSi2 films. Nevertheless, a modest but a measurable increase in both hardness and modulus with decreasing wavelength was observed, thus indicating that behavior cannot be entirely described by a simple rule-of-mixtures. The hardness was found to vary linearly with lambda-1/2 in a manner similar to the Hall-Petch relationship. Annealing the microlaminates at 800-degrees-C for 90 min produces significant increases in hardness and modulus due to chemical interaction of the layers. C1 RICE UNIV,DEPT MAT SCI,HOUSTON,TX 77251. OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP CHOU, TC (reprint author), LOCKHEED MISSILES & SPACE CO INC,DIV RES & DEV,O-93-10,B-204,PALO ALTO,CA 94304, USA. RI Nieh, Tai-Gang/G-5912-2011 OI Nieh, Tai-Gang/0000-0002-2814-3746 NR 46 TC 32 Z9 33 U1 2 U2 14 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD OCT PY 1992 VL 7 IS 10 BP 2765 EP 2773 DI 10.1557/JMR.1992.2765 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA JR170 UT WOS:A1992JR17000016 ER PT J AU CHOU, TC NIEH, TG MCADAMS, SD PHARR, GM OLIVER, WC AF CHOU, TC NIEH, TG MCADAMS, SD PHARR, GM OLIVER, WC TI MECHANICAL-PROPERTIES AND MICROSTRUCTURES OF METAL CERAMIC MICROLAMINATES .2. A MO/AL2O3 SYSTEM SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID THIN-FILMS; MAGNETIC-PROPERTIES; ELASTIC-MODULUS; HARDNESS; NICKEL; SUPERLATTICES; SILICON; STRAIN; FOILS AB Synthetic multilayers consisting of periodic layers of the refractory metal Mo and the oxide ceramic Al2O3 have been produced by alternating d.c. and r.f. reactive sputter deposition. Microlaminates with four different modulation wavelengths-5, 20, 30, and 100 nm-were investigated in this study. The compositions, periodicities, and microstructures of the microlaminates were characterized by Auger electron spectroscopy, low-angle x-ray diffraction, and transmission electron microscopy, including high resolution lattice imaging and microdiffraction. Transmission electron microscopy from the microlaminates indicated that the as-deposited Mo layers are polycrystalline, while the as-deposited Al2O3 layers are primarily amorphous. The Mo and Al2O3 layers are thermally compatible at 800-degrees-C for 6 h, showing no evidence of atomic interdiffusion between the layers. The mechanical properties of the microlaminates, as well as those of monolithic films of Mo and Al2O3 (i.e., the baseline materials), were investigated using nanoindentation methods. A higher than expected modulus and hardness were observed for the microlaminate with the longest wavelength (100 nm); otherwise the mechanical properties are explainable by a rule-of-mixtures. The enhanced mechanical properties of the 100 nm microlaminate may be attributed to crystallization of the amorphous Al2O3 layers and the evolution of a structural texture within this phase. C1 RICE UNIV,DEPT MAT SCI,HOUSTON,TX 77251. OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP CHOU, TC (reprint author), LOCKHEED MISSILES & SPACE CO INC,DIV RES & DEV,O-93-10,B-204,PALO ALTO,CA 94304, USA. RI Nieh, Tai-Gang/G-5912-2011 OI Nieh, Tai-Gang/0000-0002-2814-3746 NR 34 TC 26 Z9 26 U1 1 U2 5 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD OCT PY 1992 VL 7 IS 10 BP 2774 EP 2784 DI 10.1557/JMR.1992.2774 PG 11 WC Materials Science, Multidisciplinary SC Materials Science GA JR170 UT WOS:A1992JR17000017 ER PT J AU MILLER, DJ HETTINGER, JD CHIARELLO, RP KIM, HK AF MILLER, DJ HETTINGER, JD CHIARELLO, RP KIM, HK TI EPITAXIAL-GROWTH OF CU2O FILMS ON MGO BY SPUTTERING SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID CUPROUS-OXIDE; THIN-FILMS AB The epitaxial growth of Cu2O films is of significant interest for the unique po offer in the development of multilayer devices and superlattices. While fundamental studies may be carried out on epitaxial films prepared by any technique, the growth of artificially layered superlattices requires that films grow epitaxially during deposition. The present study examined the growth Of Cu2O on MgO substrates directly during deposition by sputtering. Although epitaxial thin films Of Cu2O could be produced, a mosaic structure was observed. The structure of the film may be related to the growth mechanism in which islands coalesce to form a continuous film. C1 PUSAN NATL UNIV,DEPT PHYS,PUSAN,SOUTH KOREA. RP MILLER, DJ (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 10 TC 12 Z9 12 U1 1 U2 7 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD OCT PY 1992 VL 7 IS 10 BP 2828 EP 2832 DI 10.1557/JMR.1992.2828 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA JR170 UT WOS:A1992JR17000023 ER PT J AU BECK, DD SIEGEL, RW AF BECK, DD SIEGEL, RW TI THE DISSOCIATIVE ADSORPTION OF HYDROGEN-SULFIDE OVER NANOPHASE TITANIUM-DIOXIDE SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID TIO2(110) SURFACES; TIO2; H2S AB A variety Of TiO2 materials, including a nanophase TiO2 powder, were evaluated for their ability to dissociatively adsorb H2S in a H-2 environment. A temperature programmed desorption technique was used to determine the rate of sulfide accumulation on the surface of the samples as a measurement of initial activity. The initial activity for the gas condensation-produced nanophase TiO2 with its rutile structure was found to be greater than that for other samples of TiO2 tested. When normalized for surface area, the initial specific activities of the rutile samples studied for the dissociative adsorption of H2S were similar in magnitude, but significantly higher than those of the anatase TiO2 samples investigated. Thus, the improvement in the activity is attributed mainly to the ability of the nanophase synthesis method to produce high surface area rutile TiO2. When evaluated using x-ray photoelectron spectroscopy, the nanophase TiO2 was found to be significantly deficient in oxygen. Annealing this material in oxygen decreased the number of anion vacancies and lowered the activity. Thus, we conclude that oxygen vacancies also contribute to the H2S dissociative adsorption activity. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP BECK, DD (reprint author), GM CORP,RES LABS,DEPT PHYS CHEM,WARREN,MI 48090, USA. NR 28 TC 106 Z9 108 U1 1 U2 14 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD OCT PY 1992 VL 7 IS 10 BP 2840 EP 2845 DI 10.1557/JMR.1992.2840 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA JR170 UT WOS:A1992JR17000025 ER PT J AU DEBSIKDAR, JC SOWEMIMO, OS AF DEBSIKDAR, JC SOWEMIMO, OS TI EFFECT OF ZIRCONIA ADDITION ON CRYSTALLINITY, HARDNESS, AND MICROSTRUCTURE OF GEL-DERIVED BARIUM ALUMINOSILICATE, BAAL2SI2O8 SO JOURNAL OF MATERIALS SCIENCE LA English DT Article AB The effect of zirconia (ZrO2) additions, in amounts equivalent to 5, 10, 20 and 40 mol %, to barium aluminosilicate, BaAl2Si2O8, was studied by examination of the phase assemblage of the mixtures after crystallization heat treatments at approximately 1050-degrees-C or more using X-ray diffraction (XRD). In all cases, BaAl2Si2O8 gel crystallized into the hexacelsian polymorph. XRD results also indicated solid solubility of 1 0 mol % or more ZrO2 in hexacelsian material. Precipitation of an additional phase, tetragonal ZrO2, occurred in the BaAl2Si2O8 material containing 20 mol % ZrO2. Also, 95% and 99% dense celsian ceramics were fabricated at 1450 and 1580-degrees-C sintering temperatures, respectively, using cold isostatically pressed pellets produced from powder mixtures containing 20 and 40 mol % ZrO2. These pellets also contained 20 wt % gel-derived lithia-doped celsian "seed" powder to promote hexacelsian to celsian transformation during sintering. Indentation hardness values for the 99% dense celsian ceramic without and with 20 mol % ZrO2 were 8.04 and 10.80 GPa, respectively. Scanning electron microscopy was used to examine the microstructures of these samples. RP DEBSIKDAR, JC (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 10 TC 18 Z9 25 U1 0 U2 1 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD OCT 1 PY 1992 VL 27 IS 19 BP 5320 EP 5324 DI 10.1007/BF00553412 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA JR572 UT WOS:A1992JR57200032 ER PT J AU HALPERN, MB OBERS, NA AF HALPERN, MB OBERS, NA TI GENERALIZED GRAPH-THEORY ON LIE-G AND APPLICATIONS IN CONFORMAL FIELD-THEORY SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article ID IRRATIONAL CENTRAL CHARGE; INFINITE-DIMENSIONAL ALGEBRAS; VIRASORO CONSTRUCTIONS; MASTER EQUATION; 2 DIMENSIONS; COMPACT-G; AFFINE-G; MODELS; SPACE AB Each magic basis of Lie g supports a generalized graph theory on Lie g, whose axioms include the graphs of order n as a special case on SO(n). Other examples include the sine-area graphs of SU(n) and the sine(+ area) graphs of SU(PI(i)n(i)). The set of all (magic basis-generalized graph theory) pairs is not known, but each possible pair corresponds to a large set of new conformal field theories. C1 LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. RP HALPERN, MB (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Obers, Niels/D-1377-2014 OI Obers, Niels/0000-0003-4947-8526 NR 37 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0022-2488 J9 J MATH PHYS JI J. Math. Phys. PD OCT PY 1992 VL 33 IS 10 BP 3274 EP 3295 DI 10.1063/1.529931 PG 22 WC Physics, Mathematical SC Physics GA JR014 UT WOS:A1992JR01400002 ER PT J AU COGGESHALL, SV MEYERTERVEHN, J AF COGGESHALL, SV MEYERTERVEHN, J TI GROUP-INVARIANT SOLUTIONS AND OPTIMAL SYSTEMS FOR MULTIDIMENSIONAL HYDRODYNAMICS SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article ID NAVIER-STOKES EQUATIONS; SIMILARITY SOLUTIONS; MHD EQUATIONS; SUBGROUPS AB The group properties of the three-dimensional (3-D), one-temperature hydrodynamic equations, including nonlinear conduction and a thermal source, are presented. A subgroup corresponding to axisymmetric geometry is chosen, and the details of the construction of the one- and two-dimensional optimal systems are shown. The two-dimensional optimal system is used to generate 23 intrinsically different reductions of the 2-D partial differential equations to ordinary differential equations. These ordinary differential equations can be solved to provide analytic solutions to the original partial differential equations. Two example analytic solutions are presented: a 2-D axisymmetric flow with a P2 asymmetry and a 3-D spiraling flow. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP COGGESHALL, SV (reprint author), MAX PLANCK INST QUANTUM OPT,W-8046 GARCHING,GERMANY. NR 23 TC 33 Z9 34 U1 1 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 OCT PY 1992 VL 33 IS 10 BP 3585 EP 3601 DI 10.1063/1.529907 PG 17 WC Physics, Mathematical SC Physics GA JR014 UT WOS:A1992JR01400033 ER PT J AU GONCZ, KK BATSON, P CIARLO, D LOO, BW ROTHMAN, SS AF GONCZ, KK BATSON, P CIARLO, D LOO, BW ROTHMAN, SS TI AN ENVIRONMENTAL SAMPLE CHAMBER FOR X-RAY MICROSCOPY SO JOURNAL OF MICROSCOPY-OXFORD LA English DT Article DE NATURAL MICROSCOPY; SPECIMEN HOLDER; X-RAY MICROSCOPY; ZYMOGEN GRANULES; ACINAR CELLS ID ZYMOGEN AB The manufacture, construction and performance of a special specimen holder for biological samples suspended in aqueous solution is described. The holder was designed for use in a scanning transmission X-ray microscope. Using it, we have successfully obtained high-resolution images of fresh cellular and subcellular specimens in suspension and have been able to vary the sample environment during viewing in the microscope. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV CALIF SAN FRANCISCO,SAN FRANCISCO,CA 94143. RP GONCZ, KK (reprint author), UNIV CALIF BERKELEY,BERKELEY,CA 94720, USA. NR 16 TC 5 Z9 5 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0022-2720 J9 J MICROSC-OXFORD JI J. Microsc.-Oxf. PD OCT PY 1992 VL 168 BP 101 EP 110 PN 1 PG 10 WC Microscopy SC Microscopy GA JV215 UT WOS:A1992JV21500010 ER PT J AU COOLING, BF AF COOLING, BF TI EMBRACE ON ANGRY WILD - THE CONFEDERACY LAST HURRAH - SPRING-HILL, FRANKLIN AND NASHVILLE - SWORD,W SO JOURNAL OF MILITARY HISTORY LA English DT Book Review RP COOLING, BF (reprint author), US DOE,WASHINGTON,DC 20585, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU SOC MILITARY HISTORY PI LEXINGTON PA C/O VIRGINIA MILITARY INST, GEORGE C MARSHALL LIBRARY, LEXINGTON, VA 24450-1600 SN 0899-3718 J9 J MILITARY HIST JI J. Mil. Hist. PD OCT PY 1992 VL 56 IS 4 BP 697 EP 698 DI 10.2307/1986177 PG 2 WC History SC History GA JR553 UT WOS:A1992JR55300019 ER PT J AU DEWEY, SL SMITH, GS LOGAN, J BRODIE, JD YU, DW FERRIERI, RA KING, PT MACGREGOR, RR MARTIN, TP WOLF, AP VOLKOW, ND FOWLER, JS MELLER, E AF DEWEY, SL SMITH, GS LOGAN, J BRODIE, JD YU, DW FERRIERI, RA KING, PT MACGREGOR, RR MARTIN, TP WOLF, AP VOLKOW, ND FOWLER, JS MELLER, E TI GABAERGIC INHIBITION OF ENDOGENOUS DOPAMINE RELEASE MEASURED INVIVO WITH C-11 RACLOPRIDE AND POSITRON EMISSION TOMOGRAPHY SO JOURNAL OF NEUROSCIENCE LA English DT Article ID LIVING HUMAN-BRAIN; GAMMA-AMINOBUTYRIC ACID; CEREBRAL BLOOD-FLOW; BABOON BRAIN; RECEPTOR OCCUPANCY; GABA-TRANSAMINASE; BASAL GANGLIA; BINDING-SITES; VINYL GABA; BENZODIAZEPINE AB Extensive neuroanatomical, neurophysiological, and behavioral evidence demonstrates that GABAergic neurons inhibit endogenous dopamine release in the mammalian corpus striatum. Positron emission tomography (PET) studies in adult female baboons, using the dopamine D2-specific radiotracer C-11-raclopride, were undertaken to assess the utility of this imaging technique for measuring these dynamic interactions in vivo. C-11-raclopride binding was imaged prior to and following the administration of either gamma-vinyl-GABA (GVG), a specific suicide inhibitor of the GABA-catabolizing enzyme GABA transaminase, or lorazepam, a clinically prescribed benzodiazepine agonist. Striatal C-11-raclopride binding increased following both GVG and lorazepam administration. This increase exceeded the test/retest variability of C-11-raclopride binding observed in the same animals. These findings confirm that changes in endogenous dopamine concentrations resulting from drug-induced potentiation of GABAergic transmission can be measured with PET and C-11-raclopride. Finally, this new strategy for noninvasively evaluating the functional integrity of neurophysiologically linked transmitter systems with PET supports its use as an approach for assessing the multiple mechanisms of drug action and their consequences in the human brain. C1 BROOKHAVEN NATL LAB, DEPT MED, UPTON, NY 11973 USA. NYU, SCH MED, DEPT PSYCHIAT, NEW YORK, NY 10016 USA. RP BROOKHAVEN NATL LAB, DEPT CHEM, UPTON, NY 11973 USA. FU NINDS NIH HHS [NS-15380, NS-15638] NR 48 TC 173 Z9 173 U1 1 U2 5 PU SOC NEUROSCIENCE PI WASHINGTON PA 11 DUPONT CIRCLE, NW, STE 500, WASHINGTON, DC 20036 USA SN 0270-6474 J9 J NEUROSCI JI J. Neurosci. PD OCT PY 1992 VL 12 IS 10 BP 3773 EP 3780 PG 8 WC Neurosciences SC Neurosciences & Neurology GA JT197 UT WOS:A1992JT19700007 PM 1357114 ER PT J AU BRINKER, CJ HURD, AJ SCHUNK, PR FRYE, GC ASHLEY, CS AF BRINKER, CJ HURD, AJ SCHUNK, PR FRYE, GC ASHLEY, CS TI REVIEW OF SOL-GEL THIN-FILM FORMATION SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WORKSHOP ON GLASSES AND CERAMICS FROM GELS CY OCT 06-11, 1991 CL SEVILLE, SPAIN SP PRESIDENCIA JUNTA ANDALUCIA, CONSEJERIA PRESIDENCIA JUNTA ANDALUCIA, CONSEJERIA EDUC & CIEN JUNTA ANDALUCIA, MINIST EDUC & CIEN SPAIN, EXCMA DIPUTAC PROV SEVILLA, EXCMO AYUNTAMIENTO SEVILLA, UNIV CADIZ, EL MONTE CAJA AHORROS HUELVA & SEVILLA, NIPPON SHEET GLASS, DOMECO ID METAL ALKOXIDES; LINBO3 FILMS; COATINGS; SILICA; GLASS; TRANSITION; HYDROLYSIS; OXIDES; DECOHESION; THICKNESS AB Sol-gel thin films are formed by gravitational or centrifugal draining accompanied by vigorous drying. Drying largely establishes the shape of the fluid profile, the timescale of the deposition process, and the magnitude of the forces exerted on the solid phase. The combination of coating theory and experiment should define coating protocols to tailor the deposition process to specific applications, RP BRINKER, CJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 69 TC 345 Z9 349 U1 14 U2 104 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD OCT PY 1992 VL 147 BP 424 EP 436 DI 10.1016/S0022-3093(05)80653-2 PG 13 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA JW920 UT WOS:A1992JW92000071 ER PT J AU TAKAHASHI, H GARNER, FA AF TAKAHASHI, H GARNER, FA TI MICROSTRUCTURAL EVOLUTION OF NEUTRON-IRRADIATED NI-SI AND NI-AL ALLOYS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID RADIATION-INDUCED SEGREGATION; SOLID-SOLUTIONS; PRECIPITATION; TEMPERATURE; FLUENCE; DEFECTS; ENERGY; NICKEL AB Additions of silicon and aluminum suppress the neutron-induced swelling of pure nickel but to different degrees. Silicon is much more effective initially when compared to aluminum on a per atom basis but silicon exhibits a nonmonotonic influence on swelling with increasing concentration. Silicon tends to segregate toward grain boundaries while aluminum segregates away from these boundaries. Whereas the formation of the Ni3Si phase is frequently observed in charged particle irradiation experiments conducted at much higher displacement rates, it did not occur during neutron irradiation in this study. Precipitation also did not occur in Ni-5Al during neutron irradiation, nor has it been reported to occur during ion irradiation. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP TAKAHASHI, H (reprint author), HOKKAIDO UNIV, SAPPORO, HOKKAIDO 060, JAPAN. NR 35 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD OCT PY 1992 VL 195 IS 1-2 BP 1 EP 10 DI 10.1016/0022-3115(92)90356-P PG 10 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY953 UT WOS:A1992JY95300001 ER PT J AU ZINKLE, SJ HORSEWELL, A SINGH, BN SOMMER, WF AF ZINKLE, SJ HORSEWELL, A SINGH, BN SOMMER, WF TI DISPERSOID STABILITY IN A CU-AL2O3 ALLOY UNDER ENERGETIC CASCADE DAMAGE CONDITIONS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID CONDUCTIVITY COPPER-ALLOYS; PHASE-STABILITY; HIGH-STRENGTH; IRRADIATION; SIZE AB A commercial dispersion-strengthened Cu-Al2O3 alloy was irradiated with 750-MeV protons at 470 K to a damage level of about 2 displacements per atom (dpa). The density and size distribution of the Al2O3 particles was measured in nonirradiated and irradiated specimens using transmission electron microscopy. The mean primary knock-on atom (PKA) energy for 750-MeV protons in copper is 2.5 MeV, which is about 10 and 100 times higher than the average PKA energies in copper for fusion and fission neutrons, respectively. The irradiation caused only a slight decrease in the mean Al2O3 size, from 10.5 nm to 8.3 nm, and a slight decrease in the particle density from 4 X 10(22)/m3 to 3 x 10(22)/m3. C1 RISO NATL LAB, DEPT MAT, DK-4000 ROSKILDE, DENMARK. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RP ZINKLE, SJ (reprint author), OAK RIDGE NATL LAB, DIV MET & CERAM, POB 2008, OAK RIDGE, TN 37831 USA. OI Zinkle, Steven/0000-0003-2890-6915; Horsewell, Andy/0000-0003-4297-2564 NR 21 TC 18 Z9 18 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 OCT PY 1992 VL 195 IS 1-2 BP 11 EP 16 DI 10.1016/0022-3115(92)90357-Q PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY953 UT WOS:A1992JY95300002 ER PT J AU MILLER, MK BURKE, MG AF MILLER, MK BURKE, MG TI AN ATOM PROBE FIELD-ION MICROSCOPY STUDY OF NEUTRON-IRRADIATED PRESSURE-VESSEL STEELS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID FINELY DISPERSED SYSTEMS; MICROSTRUCTURE PARAMETERS; STATISTICAL-ANALYSIS; PCT COPPER; PRECIPITATION; IRON-1.4; MODEL AB Atom probe field ion microscopy has revealed that the microstructure of commercial pressure vessel steels that have been neutron-irradiated is extremely complex and involves many different types of features. These features include ultrafine distributions of copper atmospheres, clusters and precipitates, phosphorus clusters, molybdenum carbides and nitrides, and vanadium carbo-nitrides in the matrix. In addition to these ultrafine features, coarse alloy cementite, molybdenum carbides, and copper-manganese precipitates have been observed at grain boundaries. The grain boundaries were also found to be coated with an ultrathin film of molybdenum carbides and nitrides and were enriched in phosphorus, nickel and manganese. C1 WESTINGHOUSE SCI & TECHNOL CTR,PITTSBURGH,PA 15235. RP MILLER, MK (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 40 TC 81 Z9 83 U1 0 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD OCT PY 1992 VL 195 IS 1-2 BP 68 EP 82 DI 10.1016/0022-3115(92)90364-Q PG 15 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY953 UT WOS:A1992JY95300009 ER PT J AU BEESTON, JM LONGHURST, GR WALLACE, RS ABELN, SP AF BEESTON, JM LONGHURST, GR WALLACE, RS ABELN, SP TI MECHANICAL-PROPERTIES OF IRRADIATED BERYLLIUM SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article AB Beryllium is planned for use as a neutron multiplier in the tritium breeding blanket of the International Thermonuclear Experimental Reactor (ITER). After fabricating samples of beryllium at densities varying from 80 to 100% of the theoretical density, we conducted a series of experiments to measure the effect of neutron irradiation on mechanical properties, especially strength and ductility. Samples were irradiated in the Advanced Test Reactor (ATR) to a neutron fluence of 2.6 x 10(25) n/m2 (E > 1 MeV) at an irradiation temperature of 75-degrees-C. These samples were subsequently compression-tested at room temperature, and the results were compared with similar tests on unirradiated specimens. We found that the irradiation increased the strength by approximately four times and reduced the ductility to approximately one fourth. Failure was generally ductile, but the 80% dense irradiated samples failed in brittle fracture with significant generation of fine particles and release of small quantities of tritium. C1 EG&G ROCKY FLATS INC,GOLDEN,CO 80402. RP BEESTON, JM (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 11 TC 12 Z9 13 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD OCT PY 1992 VL 195 IS 1-2 BP 102 EP 108 DI 10.1016/0022-3115(92)90366-S PG 7 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY953 UT WOS:A1992JY95300011 ER PT J AU HENSHALL, GA AF HENSHALL, GA TI MODELING PITTING CORROSION DAMAGE OF HIGH-LEVEL RADIOACTIVE-WASTE CONTAINERS USING A STOCHASTIC APPROACH SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID STAINLESS-STEELS; INITIATION AB Stochastic models of pitting corrosion have been explored and found to be potentially useful in predicting damage of high-level radioactive-waste containers. These computer models include simple phenomenological relationships describing the environmental dependence of the stochastic parameters, and can simulate pit initiation and growth under various environments, including those that change during exposure. Equally important, the models provide quantitative information that would be useful to performance assessment codes for the entire waste repository system. Valuable insights into the mechanisms of pit initiation and growth also have resulted from this research. Finally, comparisons between the stochastic and mechanistic approaches to modeling pitting, and directions for future research are discussed. RP HENSHALL, GA (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-355,LIVERMORE,CA 94551, USA. NR 31 TC 8 Z9 8 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD OCT PY 1992 VL 195 IS 1-2 BP 109 EP 125 DI 10.1016/0022-3115(92)90367-T PG 17 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY953 UT WOS:A1992JY95300012 ER PT J AU GIBSON, JK HAIRE, RG AF GIBSON, JK HAIRE, RG TI PHASE-RELATIONS IN NEPTUNIUM, AMERICIUM AND THE BINARY ALLOY SYSTEMS NP-AM AND NP-LN (LN = LA, ND, LU) SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID METALS AB High-temperature differential thermal analysis has been used to characterize the phase relations in neptunium, americium and the binary alloy systems, Np-Am, Np-La, Np-Nd, Np-Lu, Sm-Ce and Ce-Gd. The temperatures previously reported for the two solid-solid transformations and the fusion of Np, and for the beta(fcc) --> gamma(bcc?) and the fusion transitions of Am were confirmed. A small endothermic event (approximately 0.4 kJ mol-1) evident at 758-degrees-C for americium was assigned to its dhcp --> fcc transition; this temperature is approximately 100-degrees-C higher than previously derived from dilatometry. Although the Np-Am DTA studies were limited in the range of alloy compositions which could be investigated, the results were useful in deciphering the nature of the phase diagram. Measurements on a sample of aggregate composition Npo.54-Am0.46 suggested some degree of mutual solubility, although two (terminal) solid phases, one Np-rich and one Am-rich, were found to coexist. The supporting studies of Np-Ln and Ln-Ln' (Ln and Ln' = selected lanthanides) alloy systems established the efficacy of the DTA technique and augmented the results for the Np-Am system. RP GIBSON, JK (reprint author), OAK RIDGE NATL LAB,TRANSURANIUM RES LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 24 TC 18 Z9 18 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD OCT PY 1992 VL 195 IS 1-2 BP 156 EP 165 DI 10.1016/0022-3115(92)90371-Q PG 10 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY953 UT WOS:A1992JY95300016 ER PT J AU HICKMOTT, D SPEAR, FS AF HICKMOTT, D SPEAR, FS TI MAJOR-ELEMENT AND TRACE-ELEMENT ZONING IN GARNETS FROM CALCAREOUS PELITES IN THE NW SHELBURNE FALLS QUADRANGLE, MASSACHUSETTS - GARNET GROWTH HISTORIES IN RETROGRADED ROCKS SO JOURNAL OF PETROLOGY LA English DT Article ID P-T PATHS; RARE-EARTH ELEMENTS; SW TAUERN WINDOW; PARTITION-COEFFICIENTS; MINERAL ASSEMBLAGES; ACCESSORY MINERALS; PHASE-COMPOSITION; REACTION PROGRESS; EASTERN VERMONT; NEW-HAMPSHIRE AB Major-, minor-, and trace-element zoning have been measured in garnets from four samples of differing bulk composition from the east flank of the Shelburne Falls Dome, western Massachusetts, using ion and electron microprobes. The samples are differentially retrograded, so traditional techniques of rim geothermometry and geobarometry and P-T path analysis yield equivocal results. Trace-element abundances in garnets vary with those of major elements, particularly calcium. Garnets exhibit several types of Ca zoning, each accompanied by a distinct mode of trace-element zoning. Garnets from low-Ca pelites in the Goshen Formation decrease to low Ca abundances near their rims. This feature is coupled with a decrease in Na/Si and Ti/Si. The outermost few microns of these garnets show a depletion in Sc/Si and an enrichment in Mn/Si, Y/Si, and rare earth element (REE) abundances compared with the garnet core. These variations are ascribed to changes in intensive parameters during garnet growth/re-equilibration, probably a decrease in pressure (< 1 kb) accompanied by a small temperature increase, which led to a decrease in X(grossular). Much of the variation in trace-element content may reflect crystal-chemical effects. In contrast, cores of garnets from intermediate-Ca pelites in the Waits River Formation initially display decreases in grossular content, followed by Ca increases towards their rims. The decrease in grossular content correlates with strong increases in Y/Si, Zr/Si, and REE contents. The Ca 'inflection' observed in these garnets coincides with the last appearance of clinozoisite inclusions in garnet. Clinozoisite-compatible elements (Y, Zr, and REE) may be released during breakdown of clinozoisite in an internal metasomatic process, producing some of the trace-element enrichments. Garnets from clinozoisite-bearing pelites in the Waits River Formation exhibit zoning profiles with an increase in Ca towards the rim. An abrupt enrichment in grossular content (DELTAX(grossular) = 0.06) occurs near garnet cores in these high-CaO, low-SiO2, high-FeO samples. The Ca increase accompanies small decreases in Li/Si and Na/Si, small increases in Ti/Si and V/Si, and large decreases in Y/Si, Zr/Si, and REE abundance. The large trace-element variations are probably due to an interval of growth of clinozoisite +/- accessory minerals separating two distinct garnet-growth events. This garnet also shows Co and Cr increases toward the rim, probably as a result of breakdown of magnetite. Proton-probe microanalysis of minerals in these calc-pelites shows strong affinities of specific trace elements for certain minerals: Y in garnet, Ga and Rb in biotite, Zn and Ga in staurolite, Rb and Sr in muscovite, Sr and Pb in plagioclase, and Nb in ilmenite. Trace-element zoning is shown to be a useful monitor of reaction histories and possibly P-T paths during garnet growth. C1 RENSSELAER POLYTECH INST,DEPT GEOL,TROY,NY 12181. RP HICKMOTT, D (reprint author), LOS ALAMOS NATL LAB,DIV EARTH & ENVIRONM SCI,MS-D462,LOS ALAMOS,NM 87545, USA. RI Hickmott, Donald/C-2886-2011 NR 89 TC 62 Z9 67 U1 1 U2 9 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0022-3530 J9 J PETROL JI J. Petrol. PD OCT PY 1992 VL 33 IS 5 BP 965 EP 1005 PG 41 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KA512 UT WOS:A1992KA51200001 ER PT J AU MATHIS, CA GERDES, JM ENAS, JD WHITNEY, JM TAYLOR, SE ZHANG, Y MCKENNA, DJ HAVLIK, S PEROUTKA, SJ AF MATHIS, CA GERDES, JM ENAS, JD WHITNEY, JM TAYLOR, SE ZHANG, Y MCKENNA, DJ HAVLIK, S PEROUTKA, SJ TI BINDING POTENCY OF PAROXETINE ANALOGS FOR THE 5-HYDROXYTRYPTAMINE UPTAKE COMPLEX SO JOURNAL OF PHARMACY AND PHARMACOLOGY LA English DT Article ID SEROTONIN UPTAKE SITES; POSITRON EMISSION TOMOGRAPHY; LIVING HUMAN-BRAIN; H-3 PAROXETINE; RAT-BRAIN; AUTORADIOGRAPHIC LOCALIZATION; PARKINSONS-DISEASE; IMIPRAMINE BINDING; NEURONAL MEMBRANES; 5-HT2 RECEPTORS AB The in-vitro inhibition constants (K(i)) of 14 structural analogues of the potent 5-hydroxytryptamine (5-HT)-uptake inhibitor paroxetine were determined to assess the structure-affinity relationship of these derivatives. A goal of these studies was to determine those positions on paroxetine which could be derivatized without significantly decreasing the affinity of the drug for the binding site, so that radiolabels such as [F-18]fluoroalkyl groups might be appended for future in-vivo imaging studies of the 5-HT uptake system. Using the methyl moiety as a steric probe for these studies, it was found that the rank order of potency of various methyl-substituted paroxetine analogues for inhibiting the binding of [H-3]paroxetine to the 5-HT re-uptake site was: 4'- is-approximately-equal-to 3'- is-approximately-equal-to 2"- > 2'- is-approximately-equal-to 1- > 5"- > 6"-methyl. The in-vitro equipotent molar ratios (EPMR, K(i)(analogue)/K(i)(paroxetine)) of the analogues were determined, and the EPM Rs of the 4'-, 3'-, and 2"-methyl derivatives were 1.9, 2.2 and 2.2, respectively. The 4'- and 2"-fluoromethyl and -fluoroethyl analogues were synthesized, and the EPMRs of the 4'- and 2"-fluoromethyl derivatives were determined to be 2.0 and 3.5, and those of the 4'- and 2"- fluoroethyl analogues were 5.2 and 6.2, respectively. The 2"-fluoromethyl analogue was unstable in aqueous solutions, and it is not a promising ligand for in-vivo studies. The 4'-fluoromethyl derivative was stable in aqueous solutions and, based upon its relatively high affinity, is a candidate for radiolabelling with F-18 for in-vivo positron emission tomography studies of the 5-HT re-uptake site. C1 LAWRENCE BERKELEY LAB,DIV RES MED & RADIAT BIOPHYS,BERKELEY,CA 94720. STANFORD UNIV,MED CTR,SCH MED,DEPT NEUROL,STANFORD,CA 94305. RI Mathis, Chester/A-8607-2009 FU NINDS NIH HHS [NS-23506, NS-22899] NR 34 TC 15 Z9 15 U1 0 U2 0 PU ROYAL PHARMACEUTICAL SOC GREAT BRITAIN PI LONDON PA 1 LAMBETH HIGH ST, LONDON, ENGLAND SE1 7JN SN 0022-3573 J9 J PHARM PHARMACOL JI J. Pharm. Pharmacol. PD OCT PY 1992 VL 44 IS 10 BP 801 EP 805 PG 5 WC Pharmacology & Pharmacy SC Pharmacology & Pharmacy GA JU519 UT WOS:A1992JU51900004 PM 1360504 ER PT J AU NICHOLAS, JB WINANS, RE HARRISON, RJ ITON, LE CURTISS, LA HOPFINGER, AJ AF NICHOLAS, JB WINANS, RE HARRISON, RJ ITON, LE CURTISS, LA HOPFINGER, AJ TI AN ABINITIO INVESTIGATION OF DISILOXANE USING EXTENDED BASIS-SETS AND ELECTRON CORRELATION SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID GAUSSIAN BASIS FUNCTIONS; ATOMIC BASIS SETS; FIRST-ROW ATOMS; MOLECULAR CALCULATIONS; FORCE-FIELD; MECHANICS; SILICA; BOND; CONTRACTION; ZEOLITES AB The ab initio structure of disiloxane (H3Si-O-SiH3) is studied with a series of basis sets of increasing quality, including extended basis sets and explicit electron correlation at the single-reference single= and double-excitation configuration interaction (SDCI) level. The calculated molecular geometry and barrier to linearization of the Si-O-Si bond angle are compared to experimental and previous theoretical values. Results show that the rigorous expansion of the basis set leads to a good agreement with experimental data at the restricted Hartree-Fock (RHF) level. The potential energy curves and force constants for variation of the Si-O-Si angle and the Si-H and Si-O bond lengths are calculated and discussed in relationship to molecular modeling of zeolites and clays. We also investigate coupling between the Si-O bond and Si-O-Si bond angle. We discuss the effects of temperature on the comparison between theoretical and experimental results. C1 UNIV ILLINOIS,DEPT CHEM,CHICAGO,IL 60680. ARGONNE NATL LAB,DIV CHEM,COAL CHEM GRP,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV CHEM,THEORET CHEM GRP,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV CHEM TECHNOL,DIV MAT SCI,ARGONNE,IL 60439. NR 46 TC 61 Z9 63 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD OCT 1 PY 1992 VL 96 IS 20 BP 7958 EP 7965 DI 10.1021/j100199a026 PG 8 WC Chemistry, Physical SC Chemistry GA JQ775 UT WOS:A1992JQ77500026 ER PT J AU CHEN, G STUMP, NA HAIRE, RG PETERSON, JR ABRAHAM, MM AF CHEN, G STUMP, NA HAIRE, RG PETERSON, JR ABRAHAM, MM TI PRESSURE-INDUCED PHASE-TRANSITION IN YVO4EU3+ - A LUMINESCENCE STUDY AT HIGH-PRESSURE SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE HIGH PRESSURE; LUMINESCENCE STUDY; PHASE TRANSITION; CHARGE TRANSFER ID ABSORPTION; ZIRCON; RAMAN AB The pressure dependence of the emission from the Eu3+ ion in YVO4:Eu3+ has been investigated to 14 GPa, using a diamond anvil cell. Abrupt changes in the luminescence spectra of Eu3+ ion at 7 GPa, which, after removal of pressure, did not reverse, indicated that a pressure-induced, irreversible phase transition had occurred. The luminescence spectra from the high pressure phase showed the characteristics of a distorted D2d symmetry, which can be explained by considering only the first coordination sphere oxygens about the Eu3+ ion in an S4 symmetry site. The change in the energy separation between the 5D0 and 7F0 levels from the low pressure phase to the high pressure phase is discussed. A decrease of the effective charge on the oxygen atoms in the high pressure phase occurs and is correlated with a charge transfer mechanism that arises because of the phase transition. C1 OAK RIDGE NATL LAB,DIV CHEM,TRANSURANIUM RES LAB,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP CHEN, G (reprint author), UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996, USA. NR 12 TC 18 Z9 18 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD OCT PY 1992 VL 53 IS 10 BP 1253 EP 1257 DI 10.1016/0022-3697(92)90241-5 PG 5 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA JT805 UT WOS:A1992JT80500001 ER PT J AU SHELNUTT, JA MAJUMDER, SA SPARKS, LD HOBBS, JD MEDFORTH, CJ SENGE, MO SMITH, KM MIURA, M LUO, L QUIRKE, JME AF SHELNUTT, JA MAJUMDER, SA SPARKS, LD HOBBS, JD MEDFORTH, CJ SENGE, MO SMITH, KM MIURA, M LUO, L QUIRKE, JME TI RESONANCE RAMAN-SPECTROSCOPY OF NONPLANAR NICKEL PORPHYRINS SO JOURNAL OF RAMAN SPECTROSCOPY LA English DT Article; Proceedings Paper CT SYMP ON RAMAN SPECTROSCOPY OF BIOLOGICAL SYSTEMS CY SEP 05-07, 1992 CL UNIV BREMEN, BREMEN, GERMANY HO UNIV BREMEN ID BACTERIUM RHODOPSEUDOMONAS-VIRIDIS; PHOTOSYNTHETIC REACTION CENTER; LIGHT-ABSORPTION PROPERTIES; FORCE-FIELD; MOLECULAR STEREOCHEMISTRY; CATION RADICALS; OCTAETHYLPORPHYRIN; SPECTRA; MODELS; CHROMOPHORES AB Non-planar conformational distortions have recently been implicated in the biological activity of porphyrins and related tetrapyrroles in proteins, and several studies have used highly substituted porphyrins to model these non-planar conformational distortions. Several aspects of non-planarity in the highly substituted metalloporphyrins are discussed, focusing on resonance Raman spectroscopy as a technique for investigating these structural issues. First, different non-planar distortions cause characteristic changes in the Raman spectrum. Specifically, the decreases in frequency of several Raman lines when compared with planar porphyrin analogs are shown to be similar for several classes of non-planar highly substituted porphyrins. Second, the effect of the central metal ion [M = Ni(II), Co(II), Cu(II), Zn(II), Co(III), Fe(III)] on the conformation of the sterically constrained non-planar porphyrin octaethyl-tetraphenylporphyrin is considered. Responding to the conformational adjustments resulting from different metal size, the frequency of the structure-sensitive Raman line nu2 correlates with several structural parameters obtained from either mechanics calculations or crystallographic studies. The parameters include C(beta)-C(beta) bond length, core size and C(alpha)-N-C(alpha) angle. Finally, an effect of electron-withdrawing substituents on the Raman frequencies is evident for the different classes of highly substituted porphyrins. C1 UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. FLORIDA INT UNIV,DEPT CHEM,MIAMI,FL 33199. RP SHELNUTT, JA (reprint author), SANDIA NATL LABS,DEPT FUEL SCI 6211,ALBUQUERQUE,NM 87185, USA. RI Shelnutt, John/A-9987-2009; Senge, Mathias/F-1504-2011; Medforth, Craig/D-8210-2013; REQUIMTE, FMN/M-5611-2013; REQUIMTE, UCIBIO/N-9846-2013; Smith, Kevin/G-1453-2011 OI Shelnutt, John/0000-0001-7368-582X; Senge, Mathias/0000-0002-7467-1654; Medforth, Craig/0000-0003-3046-4909; Smith, Kevin/0000-0002-6736-4779 NR 51 TC 71 Z9 71 U1 0 U2 4 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0377-0486 J9 J RAMAN SPECTROSC JI J. Raman Spectrosc. PD OCT PY 1992 VL 23 IS 10 BP 523 EP 529 DI 10.1002/jrs.1250231004 PG 7 WC Spectroscopy SC Spectroscopy GA JU002 UT WOS:A1992JU00200003 ER PT J AU EVANS, JW NORD, RS AF EVANS, JW NORD, RS TI RANDOM AND COOPERATIVE SEQUENTIAL ADSORPTION ON INFINITE LADDERS AND STRIPS SO JOURNAL OF STATISTICAL PHYSICS LA English DT Article DE RANDOM AND COOPERATIVE SEQUENTIAL ADSORPTION; JAMMING COVERAGE; LADDERS; STRIPS; SHIELDING ID IRREVERSIBLE-PROCESSES; DIFFRACTED INTENSITY; LATTICES; KINETICS; PD(100); OXYGEN; MODEL; CHEMISORPTION; ABSORPTION; PACKING AB We analyze various processes where particles arc added irreversibly and sequentially at the sites of infinite ladders or broader strips (i.e., on terraces) of adsorption sites. For "sufficiently narrow" strips or ladders. exact solution in closed form is possible for a variety of processes. Often this is most naturally achieved by mapping the process onto an equivalent one-dimensional process typically involving competitive adsorption. We demonstrate this procedure for sequential adsorption with nearest-neighbor exclusion on a 2 x infinity square ladder. For other select processes on strips "slightly too broad" for exact solution, "almost exact" analysis is possible exploiting an empty-site shielding property. In this way, we determine a jamming coverage of 0.91556671 for random sequential adsorption of dimers on a 2 x infinity square ladder. For "broader" strips, we note that the complexity of these problems quickly approaches that for infinity x infinity lattices. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. EASTERN MICHIGAN UNIV,DEPT CHEM,YPSILANTI,MI 48197. RP EVANS, JW (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 39 TC 4 Z9 4 U1 1 U2 3 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 OCT PY 1992 VL 69 IS 1-2 BP 151 EP 162 DI 10.1007/BF01053787 PG 12 WC Physics, Mathematical SC Physics GA JT172 UT WOS:A1992JT17200009 ER PT J AU TAFURI, F KRESIN, VZ AF TAFURI, F KRESIN, VZ TI STRONG COUPLING THEORY AND THE JOSEPHSON CURRENT INTO PROXIMITY HIGH-TC JUNCTIONS SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE HIGH-CRITICAL-TEMPERATURE SUPERCONDUCTORS; PROXIMITY EFFECT; STRONG COUPLING THEORY; JOSEPHSON EFFECT ID ENERGY-GAP; TEMPERATURE AB The correlation between the order parameter and the energy gap is studied. Josephson junctions containing proximity systems are described within the framework of the strong coupling theory. The value of the current is affected by the difference between the order parameter at zero frequency and the energy gap. The proximity effect leads to depression of the Josephson current for the high-critical-temperature junctions. C1 UNIV NAPOLI FEDERICO 2,DIPARTIMENTO SCI FIS,NAPLES,ITALY. RP TAFURI, F (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. OI Tafuri, Francesco/0000-0003-0784-1454 NR 13 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD OCT PY 1992 VL 5 IS 5 BP 437 EP 440 DI 10.1007/BF00620500 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA KG150 UT WOS:A1992KG15000001 ER PT J AU HENDREY, GR LEWIN, KF KOLBER, Z EVANS, LS AF HENDREY, GR LEWIN, KF KOLBER, Z EVANS, LS TI CONTROLLED ENRICHMENT SYSTEM FOR EXPERIMENTAL FUMIGATION OF PLANTS IN THE FIELD WITH SULFUR-DIOXIDE SO JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION LA English DT Article ID OPEN-AIR FUMIGATION; YIELD; CO2 AB A prototype Free-Air Controlled Enrichment (FACE) system was developed at Brookhaven National Laboratory (BNL) for the experimental control of gas concentrations in an open field, without any form of enclosure. This FACE system consists of a toroidal plenum chamber, 15 m in diameter, with a series of 32 vertical vent pipes from which the release of a test gas can be controlled. Data on gas concentration at the center of the array and wind velocity are fed to a microprocessor where a proportional, integrative, differential (PID) algorithm is used to regulate a mass-flow controller. Data on wind direction are used to control the opening and closing of the vertical vent pipes to maintain an upwind release. In 72 hours of continuous operation during which wind velocity varied between 0.3 to 8 m sec-1, the FACE prototype maintained 1-min averaged concentrations within twenty percent of the 40 ppb set point 94 percent of the time. C1 MANHATTAN COLL,MORPHOGENESIS LAB,BRONX,NY 10471. RP HENDREY, GR (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. NR 11 TC 12 Z9 12 U1 0 U2 1 PU AIR & WASTE MANAGEMENT ASSOC PI PITTSBURGH PA PO BOX 2861, PITTSBURGH, PA 15230 SN 1047-3289 J9 J AIR WASTE MANAGE JI J. Air Waste Manage. Assoc. PD OCT PY 1992 VL 42 IS 10 BP 1324 EP 1327 PG 4 WC Engineering, Environmental; Environmental Sciences; Meteorology & Atmospheric Sciences SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA JT808 UT WOS:A1992JT80800008 ER PT J AU BLEIER, A BECHER, PF ALEXANDER, KB WESTMORELAND, CG AF BLEIER, A BECHER, PF ALEXANDER, KB WESTMORELAND, CG TI EFFECT OF AQUEOUS PROCESSING CONDITIONS ON THE MICROSTRUCTURE AND TRANSFORMATION BEHAVIOR IN AL2O3-ZRO2(CEO2) COMPOSITES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID PRESSURE FILTRATION; FRACTURE-TOUGHNESS; PARTICLE PACKING; TETRAGONAL ZRO2; ZIRCONIA; CERAMICS; CONSOLIDATION; PHASE AB Aqueous processing of Al2O3-ZrO2 (12 mol% CeO2) composites, combined with sintering conditions, was used to control the microstructure and its influence on the martensitic transformation temperature of t-ZrO2 and the transformation-toughening contribution at room temperature. The resultant ZrO2 grain sizes in the dense composites were related to the transformation-toughening behavior of t-ZrO2. The data show that (1) the best processing conditions exist when the electrophoretic mobilities of the two solids are positive, adequately high to ensure colloidal stability, efficient packing, and uniform ZrO2 distribution, but differ greatly in magnitude, (2) the colloidal stability of ZrO2 controls the overall stability and the rheological and processing behavior of this mixture, (3) the grain size distribution in dense pieces sintered for 1 h at 1500-degrees-C is comparable to the particle size distribution of the powders, (4) the martensite start temperature for the tetragonal-to-monoclinic transformation in Al2O3 Containing 20 and 40 vol% ZrO2 increases and can approach 0-degrees-C with increasing average ZrO2 grain size, and, as a result, (5) the fracture toughness values at room temperature are raised from 4-5 MPa.m1/2 to 9-12 MPa.m1/2 for these two compositions. RP BLEIER, A (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 45 TC 26 Z9 26 U1 0 U2 0 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD OCT PY 1992 VL 75 IS 10 BP 2649 EP 2658 DI 10.1111/j.1151-2916.1992.tb05484.x PG 10 WC Materials Science, Ceramics SC Materials Science GA JT351 UT WOS:A1992JT35100004 ER PT J AU VAHLAS, C BESMANN, TM AF VAHLAS, C BESMANN, TM TI THERMODYNAMICS OF THE Y-BA-CU-C-O-H SYSTEM - APPLICATION TO THE ORGANOMETALLIC CHEMICAL VAPOR-DEPOSITION OF THE YBA2CU3O7-X PHASE SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID CAF2-BASED EMF-MEASUREMENTS; TC SUPERCONDUCTING FILMS; THIN-FILMS; STABILITY; TEMPERATURE; Y2O3-BAO-CUO; PRECURSORS; CVD; COMPATIBILITIES; 950-DEGREES-C AB A calculational thermodynamic investigation of the chemical vapor deposition (CVD) of YBa2Cu3O7-x from organometallic precursors has been performed, based on the minimization of the Gibbs energy of the Y-Ba-Cu-C-O-H chemical system. Thermodynamic data for the participating compounds were selected after a critical assessment of the available thermochemical information and are self-consistent with an accepted phase diagram. The results are presented in CVD diagrams which illustrate the influence of the most commonly used operating conditions of temperature, pressure, and initial gas composition on the formation of stable phases. C1 CTR HELIOPARC,LAB MARCEL MATHIEU,F-64000 PAU,FRANCE. RP VAHLAS, C (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 62 TC 15 Z9 15 U1 0 U2 1 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD OCT PY 1992 VL 75 IS 10 BP 2679 EP 2686 DI 10.1111/j.1151-2916.1992.tb05488.x PG 8 WC Materials Science, Ceramics SC Materials Science GA JT351 UT WOS:A1992JT35100008 ER PT J AU SHENG, D COMPTON, RN YOUNG, JP MAMANTOV, G AF SHENG, D COMPTON, RN YOUNG, JP MAMANTOV, G TI PREPARATION OF C-70 DOPED SOLID SILICA-GEL VIA SOL-GEL PROCESS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note ID C60; C70 AB We reported the first preparation of C70-doped solid gel. Its UV-visible spectrum was recorded. C1 OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. RP SHENG, D (reprint author), OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831, USA. RI Dai, Sheng/K-8411-2015 OI Dai, Sheng/0000-0002-8046-3931 NR 9 TC 3 Z9 5 U1 0 U2 4 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD OCT PY 1992 VL 75 IS 10 BP 2865 EP 2866 PG 2 WC Materials Science, Ceramics SC Materials Science GA JT351 UT WOS:A1992JT35100038 ER PT J AU BESMANN, TM SHELDON, BW MOSS, TS KASTER, MD AF BESMANN, TM SHELDON, BW MOSS, TS KASTER, MD TI DEPLETION EFFECTS OF SILICON-CARBIDE DEPOSITION FROM METHYLTRICHLOROSILANE SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note ID CHEMICAL VAPOR-DEPOSITION; COMPOSITES; SI AB The deposition rate of SiC on carbon-coated Nicalon fibers from methyltrichlorosilane in hydrogen was measured as a function of temperature, pressure, total flow rate, and simulated reactant depletion. The results, together with kinetic information on the stability of methyltrichlorosilane, led to two conclusions: (1) two different mechanisms of deposition can occur depending on whether the methyltrichlorosilane has an opportunity to dissociate into separate silicon- and carbon-containing precursors, and (2) the deposition rate is strongly reduced by the generation of byproduct HCl. The data were fitted to a simple etch model to obtain a kinetic expression that accounts for the significant effect of HCl. RP BESMANN, TM (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 13 TC 65 Z9 65 U1 0 U2 5 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD OCT PY 1992 VL 75 IS 10 BP 2899 EP 2903 DI 10.1111/j.1151-2916.1992.tb05529.x PG 5 WC Materials Science, Ceramics SC Materials Science GA JT351 UT WOS:A1992JT35100049 ER PT J AU LOO, RRO UDSETH, HR SMITH, RD AF LOO, RRO UDSETH, HR SMITH, RD TI A NEW APPROACH FOR THE STUDY OF GAS-PHASE ION-ION REACTIONS USING ELECTROSPRAY IONIZATION SO JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY LA English DT Article ID CAPILLARY ZONE ELECTROPHORESIS; COLLISION-INDUCED DISSOCIATION; MULTIPLY CHARGED IONS; MASS-SPECTROMETRY; ATMOSPHERIC-PRESSURE; INTERFACE; BIOMOLECULES; MACROIONS; CHEMISTRY; MOLECULES AB A simple flow reactor which facilitates the study and application of ion-ion and ion-molecule reactions at near atmospheric pressures is reported. Reactant ions were generated by electrospray ionization and discharge ionization methods, although any ionization sources amenable to atmospheric pressure may be used. Ions of opposite charge are generated in spatially separate ion sources and are swept into capillary inlets where the flows are merged and where reaction(s) can occur. Among the reactions investigated were the partial neutralization of multiply protonated polypeptides and proteins such as melittin, bradykinin, cytochrome c, and myoglobin by reaction with discharge-generated anions, the partial neutralization of multiply charged anions of oligodeoxyadenylic acid (d(pA)3) by reaction with discharge-generated cations, the partial neutralization of bovine A-chain insulin anions by reaction with myoglobin [M + nH]n+ ions, and the reaction of multiply protonated melittin with discharge-generated cations. The cation-anion reactions generally resulted in a shift to lower charge (higher mass-to-charge ratio) in the products' charge state distributions and the transfer of solvent molecules to the macromolecule products. Multiply protonated melittin was detected in a less highly solvated state with the positive discharge in operation. 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 58 TC 47 Z9 48 U1 1 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 OCT PY 1992 VL 3 IS 7 BP 695 EP 705 PG 11 WC Chemistry, Analytical; Chemistry, Physical; Spectroscopy SC Chemistry; Spectroscopy GA JQ097 UT WOS:A1992JQ09700002 ER PT J AU MARTENS, JS SORENSEN, NR GINLEY, DS AF MARTENS, JS SORENSEN, NR GINLEY, DS TI A NOVEL MILLIMETER-WAVE CORROSION DETECTION METHOD SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID SURFACE-RESISTANCE AB A new electromagnetic method has been developed for detecting corrosion as well as determining the thickness, rate of accumulation, and electrical properties of the modified material. This noncontact method uses a Gaussian resonator operating in the range almost-equal-to 20-200 GHz. In fact, a window can separate the sample and the measurement electronics allowing in situ diagnostics. Experiments have been done on the oxidation of Fe and the sulfidation of Cu and Ag. The growth thicknesses determined from this technique agree very well with those calculated from mass change or quartz crystal resonance data. The electrical properties calculated for the sulfide growth layers also agree reasonably well with published values. RP MARTENS, JS (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD OCT PY 1992 VL 139 IS 10 BP 2886 EP 2889 DI 10.1149/1.2069000 PG 4 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA JR764 UT WOS:A1992JR76400038 ER PT J AU GOTTESFELD, S AF GOTTESFELD, S TI NAFION DISTRIBUTION IN GAS-DIFFUSION ELECTRODES FOR SOLID-POLYMER-ELECTROLYTE-FUEL CELL APPLICATIONS SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Note RP GOTTESFELD, S (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 3 TC 5 Z9 5 U1 0 U2 2 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD OCT PY 1992 VL 139 IS 10 BP 2980 EP 2980 DI 10.1149/1.2148744 PG 1 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA JR764 UT WOS:A1992JR76400058 ER PT J AU SOPER, SA DAVIS, LM SHERA, EB AF SOPER, SA DAVIS, LM SHERA, EB TI DETECTION AND IDENTIFICATION OF SINGLE MOLECULES IN SOLUTION SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID CAPILLARY ZONE ELECTROPHORESIS; LASER-INDUCED FLUORESCENCE; SHEATH FLOW CUVETTE; CYTOMETRY AB We have extended our recent experiments in the detection of single fluorescent molecules in solution to the exploration of spectroscopy at the single-molecule level. As a first step we have developed a technique that can efficiently distinguish between two species of dye molecules on the basis of differences in their emission spectra. We have also demonstrated that another spectroscopic property, fluorescence lifetime, can be accurately determined at the single-molecule level. Spectroscopic properties can be used to identify fluorescent molecules and to reveal static or slowly varying aspects of the microenvironment of each molecule, thereby yielding information unavailable from bulk studies. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV TENNESSEE,INST SPACE,TULLAHOMA,TN 37388. RI Davis, Lloyd/D-7648-2013 OI Davis, Lloyd/0000-0002-3169-3044 NR 22 TC 115 Z9 115 U1 0 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD OCT PY 1992 VL 9 IS 10 BP 1761 EP 1769 DI 10.1364/JOSAB.9.001761 PG 9 WC Optics SC Optics GA JR872 UT WOS:A1992JR87200001 ER PT J AU FARROW, RL RAKESTRAW, DJ DREIER, T AF FARROW, RL RAKESTRAW, DJ DREIER, T TI INVESTIGATION OF THE DEPENDENCE OF DEGENERATE 4-WAVE-MIXING LINE-INTENSITIES ON TRANSITION DIPOLE-MOMENT SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID RAMAN-SPECTROSCOPY; FLAMES; OH; LASER; FLUORESCENCE; NO AB We report an investigation of the dependence on transition dipole moment of isolated line intensities in degenerate four-wave mixing in the A 2SIGMA+ (v' = 0) <-- X 2PI (v" = 0) band for NO. For spectrally integrated intensities we found that the dependence was well described by a power law mu(x), where mu is the one-photon transition dipole moment. As a result of saturation, the exponent x depends on laser intensity. The observations are in reasonable agreement with a simple two-level model [Opt. Lett. 2, 94 (1978); 3, 205 (1978)], which predicts limiting dependences of mu8 and mu3 for low and high intensities, respectively. At intermediate laser intensities the model is consistent with an observed rapid decrease in the exponent with increasing laser intensity, followed by a plateau extending to high intensities. C1 INST PHYS CHEM,W-6900 HEIDELBERG,GERMANY. RP FARROW, RL (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. RI Dreier, Thomas/S-6278-2016 OI Dreier, Thomas/0000-0001-8313-4992 NR 28 TC 103 Z9 103 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD OCT PY 1992 VL 9 IS 10 BP 1770 EP 1777 DI 10.1364/JOSAB.9.001770 PG 8 WC Optics SC Optics GA JR872 UT WOS:A1992JR87200002 ER PT J AU RYAN, JR BEACH, R AF RYAN, JR BEACH, R TI OPTICAL-ABSORPTION AND STIMULATED-EMISSION OF NEODYMIUM IN YTTRIUM LITHIUM-FLUORIDE SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID ND-YLF; LASER; INTENSITIES AB A spectroscopic investigation of Nd3+ in yttrium lithium fluoride was performed. Spectrally and orientationally resolved cross sections for the F-4(3/2)-I-4(11/2) and F-4(3/2)-I-4(9/2) transitions are presented. We applied the Judd-Ofelt theory to measured absorption spectra to determine the orientation-averaged intensity parameters OMEGA2 = 0.362 X 10(-20) cm2, OMEGA4 = 4.02 X 10(-20) cm2, and OMEGA6 = 4.84 X 10(-20) cm2. Using these intensity parameters, we predicted the radiative lifetime of the metastable F-4(3/2) state to be 525 mus, in excellent agreement with measured F-4(3/2) decay signatures. Finally, absorption cross-section data are presented that will be of interest to the laser designer. RP RYAN, JR (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 14 TC 75 Z9 76 U1 2 U2 15 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD OCT PY 1992 VL 9 IS 10 BP 1883 EP 1887 DI 10.1364/JOSAB.9.001883 PG 5 WC Optics SC Optics GA JR872 UT WOS:A1992JR87200015 ER PT J AU JIN, Y WUNDERLICH, B AF JIN, Y WUNDERLICH, B TI SINGLE RUN HEAT-CAPACITY MEASUREMENTS .3. DATA-ANALYSIS SO JOURNAL OF THERMAL ANALYSIS LA English DT Article DE HEAT CAPACITY; DATA ANALYSIS; DIFFERENTIAL SCANNING CALORIMETER; DSC; SINGLE RUN ID THERMODYNAMIC PROPERTIES; LINEAR MACROMOLECULES; POLYMERS AB An outline for the data analysis of single-run heat capacity measurments by dual sample DSC is presented with the following features: 1. Heat flow correction by subtracting the contribution due to the sample pan, including correction for mismatched pan masses. 2. Heat flow and temperature correction with a nonlinear temperature calibration, temperature lag correction, and heating rate correction. 3. Calculation of the cell constants for both cell positions and evaluation of the asymmetry factor between cell positions A and B. 4. Heat capacity calibration and calculation with slope and asymmetry correction. 5. Calculation of heat capacity for multiple runs. 6. Data curve fitting for heat capacity. C1 OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. RP JIN, Y (reprint author), UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996, USA. NR 28 TC 11 Z9 11 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0368-4466 J9 J THERM ANAL JI J. Therm. Anal. PD OCT PY 1992 VL 38 IS 10 BP 2257 EP 2272 DI 10.1007/BF02123979 PG 16 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA KJ469 UT WOS:A1992KJ46900002 ER PT J AU BAER, JF GIBSON, SV WELLER, RE BUSCHBOM, RL LEATHERS, CW AF BAER, JF GIBSON, SV WELLER, RE BUSCHBOM, RL LEATHERS, CW TI NATURALLY-OCCURRING AORTIC-ANEURYSMS IN OWL MONKEYS (AOTUS SPP) SO LABORATORY ANIMAL SCIENCE LA English DT Article ID SAIMIRI-SCIUREUS; DISSECTION AB Spontaneous aortic aneurysms were diagnosed in 22 owl monkeys (Aotus spp.) at necropsy. There were 6 males and 16 females. Clinical findings varied including weight loss, weakness, and lethargy and were not present in all animals. Aortic lesions ranged in size from 2 mm to 3 cm in diameter. Nineteen of the aneurysms were classified histologically as dissecting and three as saccular. Lesions occurred less often in karyotype I monkeys than in karyotype II or III monkeys. The etiopathogenesis of aortic aneurysm in owl monkeys is unknown. C1 UNIV SO ALABAMA, DEPT COMPARAT MED, MOBILE, AL 36688 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. WASHINGTON STATE UNIV, DEPT VET MICROBIOL & PATHOL, PULLMAN, WA 99164 USA. RP BAER, JF (reprint author), BAXTER HEALTHCARE CORP, DIV CARDIOVASC SURG, MS 44, 17221 RED HILL AVE, IRVINE, CA 92714 USA. NR 19 TC 6 Z9 6 U1 0 U2 0 PU AMER ASSOC LABORATORY ANIMAL SCIENCE PI CORDOVA PA 70 TIMBERCREEK DR, SUITE 5, CORDOVA, TN 38018 SN 0023-6764 J9 LAB ANIM SCI JI Lab. Anim. Sci. PD OCT PY 1992 VL 42 IS 5 BP 463 EP 466 PG 4 WC Veterinary Sciences; Zoology SC Veterinary Sciences; Zoology GA JV915 UT WOS:A1992JV91500007 PM 1460844 ER PT J AU WILSON, TE BEDNARSKI, MD AF WILSON, TE BEDNARSKI, MD TI POLYDIACETYLENE MONOLAYERS FUNCTIONALIZED WITH AMINO-ACIDS SO LANGMUIR LA English DT Letter ID SELF-ASSEMBLED MONOLAYERS; POLYMERIC ORIENTED SYSTEMS; ORGANIC MONOLAYERS; MOLECULAR ARCHITECTURE; SURFACE RECOGNITION; GOLD; FILMS; CHAIN; BIOMEMBRANES; COADSORPTION AB Monomolecular polydiacetylene films have been constructed from a series of lipid monomers functionalized with amino acids. A wide range of surfaces including plastics, glass, and metals can be conveniently coated with peptides using these films. The techniques of X-ray photoelectron spectroscopy, fluorescence microscopy, and contact angle measurements were used to characterize the films. These studies indicate that the amino acid head groups are localized at the film-ambient interface and suggest that the films are structurally ordered both laterally and vertically. Thus, polydiacetylene films may provide promising model systems for investigating the fundamental properties of interfaces. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. NR 38 TC 12 Z9 12 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD OCT PY 1992 VL 8 IS 10 BP 2361 EP 2364 DI 10.1021/la00046a004 PG 4 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA JU640 UT WOS:A1992JU64000004 ER PT J AU HRBEK, J SHAM, TK SHEK, ML XU, GQ AF HRBEK, J SHAM, TK SHEK, ML XU, GQ TI POTASSIUM OXYGEN INTERACTIONS ON A RU(001) SURFACE SO LANGMUIR LA English DT Article ID TRANSITION-METAL SURFACES; ABSORPTION FINE-STRUCTURE; CO + K; CHEMISORBED MOLECULES; LOW-TEMPERATURES; PHOTOEMISSION; ADSORPTION; OXIDATION; PT(111); COADSORPTION AB The interaction of potassium with oxygen has been examined using synchrotron-based photoemission and NEXAFS, thermal desorption; work function measurements, and isotope exchange. Potassium coverages on Ru(001) surface ranging from monolayer to multilayer were investigated. Oxygen coadsorbed with potassium at 80 K forms a potassium-dioxygen complex, where both peroxide and superoxide ions were identified. The complex has high thermal stability on the Ru(001) surface, decomposing and desorbing at T > 900 K. C1 BROOKHAVEN NATL LAB, NSLS, UPTON, NY 11973 USA. UNIV WESTERN ONTARIO, DEPT CHEM, LONDON N6A 5B7, ONTARIO, CANADA. RP HRBEK, J (reprint author), BROOKHAVEN NATL LAB, DEPT CHEM, UPTON, NY 11973 USA. RI Xu, Guo Qin/C-2077-2013; Hrbek, Jan/I-1020-2013 NR 55 TC 11 Z9 11 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0743-7463 J9 LANGMUIR JI Langmuir PD OCT PY 1992 VL 8 IS 10 BP 2461 EP 2472 DI 10.1021/la00046a019 PG 12 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA JU640 UT WOS:A1992JU64000019 ER PT J AU BALLINGER, TH SMITH, RS COLSON, SD YATES, JT AF BALLINGER, TH SMITH, RS COLSON, SD YATES, JT TI THERMAL-DECOMPOSITION OF 1,1,1-TRICHLOROETHANE AND 1,1-DICHLOROETHENE OVER HIGH SURFACE-AREA ALUMINA SO LANGMUIR LA English DT Article ID GAMMA-ALUMINA; TEMPERATURE; ISOMERIZATION; ADSORPTION; CATALYSTS; IR AB Mass spectrometry and X-ray photoelectron spectroscopy have been used to study the decomposition of 1,1,1-trichloroethane (CH3CCl3) over high surface area gamma-alumina (Al2O3) in the temperature range 300-1000 K under flow conditions. The dehydrochlorination of CH3CC13(g) occurs in the temperature range 400-600 K to form 1,1-dichloroethene(g) (CH2=CCl2(g)) and HCI(g). Above 700 K the CH2=CCl2(g) decomposes to form HCI(g), and carbon was deposited on the Al2O3 surface. No evidence for the production of chloroacetylene or other major gas phase products from CH2=CCl2 Was found, indicating that CH3CC13 dehydrochlorination to adsorbed C and HCI(g) involves a single gas phase intermediate, CH2=CCl2. C1 UNIV PITTSBURGH, CTR SURFACE SCI, DEPT CHEM, PITTSBURGH, PA 15260 USA. PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RI Smith, Scott/G-2310-2015 OI Smith, Scott/0000-0002-7145-1963 NR 29 TC 19 Z9 19 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD OCT PY 1992 VL 8 IS 10 BP 2473 EP 2478 DI 10.1021/la00046a020 PG 6 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA JU640 UT WOS:A1992JU64000020 ER PT J AU POPENOE, DD DEINHAMMER, RS PORTER, MD AF POPENOE, DD DEINHAMMER, RS PORTER, MD TI INFRARED SPECTROELECTROCHEMICAL CHARACTERIZATION OF FERROCENE-TERMINATED ALKANETHIOLATE MONOLAYERS AT GOLD SO LANGMUIR LA English DT Article ID SELF-ASSEMBLED MONOLAYERS; INTRAMOLECULAR ELECTRON-TRANSFER; STRUCTURAL CHARACTERIZATION; PLATINUM-ELECTRODES; ORGANIC-SURFACES; METAL-SURFACES; SPECTROSCOPY; KINETICS; COADSORPTION; DESORPTION AB Cyclic voltammetry and in situ infrared reflection-absorption spectroscopy with electrochemical modulation were applied to the study of monolayers self-assembled from 11-mercaptoundecyl ferrocene-carboxylate (FcCOOC11SH) at gold. Voltammetry was used to assess both the reactivity and stability of the surface film in various aqueous electrolytes. The results of these studies indicated that the ferrocenyl monolayers are relatively unstable at pH > 2, except when perchlorate is the dominant anion present. A large change in double-layer capacitance observed upon oxidation of the ferrocenyl end group was attributed to the creation of cationic sites in the diffuse layer. Compositional and structural correlations between the monolayer and the redox chemistry of the ferrocenyl end group were probed using the in situ spectroscopic technique. The features observed in the differential spectra of the oxidized form of the film were ascribed to changes in the bond strengths of the adsorbate as a result of generation of a ferricinium ion. No detectable changes in orientation of the polymethylene chains as a function of applied voltage were observed. The spectral data also suggest that the redox chemistry leads to a reorientation of the water molecules in the region near the ferrocenyl end group. Vibrational mode assignments for FcCOOC11SH, based on studies of several analogs with different alkoxy groups, are presented along with infrared spectra and band assignments for several isotopically labeled ferrocenyl esters (i.e., ethyl ferrocenecarboxylate, ethyl-d5 ferrocenecarboxylate, and 2-(dimethylamino)ethyl ferrocenecarboxylate). C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 53 TC 134 Z9 134 U1 4 U2 29 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD OCT PY 1992 VL 8 IS 10 BP 2521 EP 2530 DI 10.1021/la00046a028 PG 10 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA JU640 UT WOS:A1992JU64000028 ER PT J AU DRABANT, B JURCO, B SCHLIEKER, M WEICH, W ZUMINO, B AF DRABANT, B JURCO, B SCHLIEKER, M WEICH, W ZUMINO, B TI THE HOPF ALGEBRA OF VECTOR-FIELDS ON COMPLEX QUANTUM GROUPS SO LETTERS IN MATHEMATICAL PHYSICS LA English DT Article ID DIFFERENTIAL-CALCULUS AB We derive the equivalence of the complex quantum enveloping algebra and the algebra of complex quantum vector fields for the Lie algebra types A(n), B(n), C(n), and D(n) by factorizing the vector fields uniquely into a triangular and a unitary part and identifying them with the corresponding elements of the algebra of regular functionals. C1 TECH UNIV CLAUSTHAL,ARNOLD SOMMERFELD INST,W-3392 CLAUSTHAL ZELLERFE,GERMANY. UNIV MUNICH,SEKT PHYS,LEHRSTUHL PROF WESS,W-8000 MUNICH 2,GERMANY. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. RP DRABANT, B (reprint author), WERNER HEISENBERG INST,MAX PLANCK INST PHYS,FOHRINGER RING 6,W-8000 MUNICH 40,GERMANY. NR 14 TC 7 Z9 7 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0377-9017 J9 LETT MATH PHYS JI Lett. Math. Phys. PD OCT PY 1992 VL 26 IS 2 BP 91 EP 96 DI 10.1007/BF00398805 PG 6 WC Physics, Mathematical SC Physics GA KC439 UT WOS:A1992KC43900002 ER PT J AU CHENG, J XENOPOULOS, A WUNDERLICH, B AF CHENG, J XENOPOULOS, A WUNDERLICH, B TI 2-DIMENSIONAL NMR-STUDIES ON THE ADDITIVITY RULES FOR C-13 CHEMICAL-SHIFTS IN TETRA-N-ALKYLAMMONIUM HALIDES SO MAGNETIC RESONANCE IN CHEMISTRY LA English DT Article DE TETRA-N-ALKYLAMMONIUM HALIDE; C-13 CHEMICAL SHIFT; 2-DIMENSIONAL NMR; C-13 CHEMICAL SHIFT ADDITIVITY RULES ID NUCLEAR MAGNETIC-RESONANCE; C-13; SPECTROSCOPY; SALTS AB The C-13 chemical shifts of symmetric tetra-n-alkylammonium cations with n = 1-18 were identified unambiguously using two-dimensional homonuclear (H-1) chemical shift correlation (COSY) and heteronuclear (H-1, C-13) chemical shift correlation spectroscopy (XHCORR). The C-13 chemical shifts in small tetra-n-alkylammonium cations with less than five carbons in a chain are found to decrease from C-1 (bonded to the nitrogen) (52-60 ppm) to the methyl chain end (7-14 ppm). For the cations with longer chains the values of chemical shifts are not in sequence with the carbon positions in an alkyl chain. The chemical shifts of C-2 (22.5 ppm) are close to that of the methylene carbon next to the methyl group. The C-3 carbon resonates at 26.4 ppm and is more shielded than the third carbon from the chain end (31.4 ppm). The chemical shifts of the remaining carbons are very similar to those of carbons in a corresponding linear alkane. The differences of the chemical shifts in alkylammonium salts from the corresponding n-alkanes are largest for C-1, C-2 and C-3, and this can be ascribed to the effects of the positive charge on C-1, and the restricted segmental motion for the innermost region of the cations. Empirical additivity rules for the chemical shifts of C-1, C-2, and C-3 are derived from the experimental results on 26 symmetric tetra-n-alkylammonium salts, and are tested for some asymmetrical systems with unequal chain lengths in the cation. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37830. NR 20 TC 8 Z9 8 U1 0 U2 1 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0749-1581 J9 MAGN RESON CHEM JI Magn. Reson. Chem. PD OCT PY 1992 VL 30 IS 10 BP 917 EP 926 DI 10.1002/mrc.1260301002 PG 10 WC Chemistry, Multidisciplinary; Chemistry, Physical; Spectroscopy SC Chemistry; Spectroscopy GA JT240 UT WOS:A1992JT24000001 ER PT J AU ANNIS, BK SCHWARK, DW REFFNER, JR THOMAS, EL WUNDERLICH, B AF ANNIS, BK SCHWARK, DW REFFNER, JR THOMAS, EL WUNDERLICH, B TI DETERMINATION OF SURFACE-MORPHOLOGY OF DIBLOCK COPOLYMERS OF STYRENE AND BUTADIENE BY ATOMIC FORCE MICROSCOPY SO MAKROMOLEKULARE CHEMIE-MACROMOLECULAR CHEMISTRY AND PHYSICS LA English DT Article ID BLOCK AB A detailed study by atomic force microscopy of the surfaces of diblock copolymers which exhibit lamellar and spherical microphase domains in the bulk is presented. The surface morphology of the lamellar samples consists of corrugations. Transmission electron microscopy of cross sections which include the surface and near surface demonstrate the connection between the corrugations and the bulk lamellae. The surface of a sample with spherical bulk domains was found to consist of a series of pits that can be linked with centers on the faces of the cubic cell arrangement of the bulk. Disclinations and intersections of lamellae could be found. The latter result in lamellar break-up in the contact area of the two lamellar orientations. Lamellar tilt can lead to variation in periodicity and depth of the surface morphology. Damage due to scanning was observed, but only for the sample with spherical morphology. C1 MIT,DEPT MAT SCI & ENGN,CAMBRIDGE,MA 02139. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. RP ANNIS, BK (reprint author), OAK RIDGE NATL LAB,DIV CHEM,BOX 2008,OAK RIDGE,TN 37831, USA. NR 12 TC 47 Z9 47 U1 0 U2 3 PU HUTHIG & WEPF VERLAG PI BASEL PA AUF DEM WOLF 4, CH-4052 BASEL, SWITZERLAND SN 0025-116X J9 MAKROMOL CHEM PD OCT PY 1992 VL 193 IS 10 BP 2589 EP 2604 PG 16 WC Polymer Science SC Polymer Science GA JT061 UT WOS:A1992JT06100009 ER PT J AU LEE, JH GIBSON, ED VERHOEVEN, JD AF LEE, JH GIBSON, ED VERHOEVEN, JD TI ETCHING CHARACTERISTICS OF NI3AL SO MATERIALS CHARACTERIZATION LA English DT Article AB Etched surfaces of Ni3Al (gamma' phase) and mixtures of Ni3Al and Ni (gamma phase) have revealed a large variation in gray level for different grains depending upon their crystallographic orientation. A selected area electron channeling pattern study in the scanning electron microscope has shown that grains oriented near [001] etch light, while those oriented near [111] etch dark with a gradual transition for intermediate orientations. It is shown that the etching characteristics result from formation of {001} facets on the etched surface, which produces a nearly planar surface on {001} faces and microfaceted arrays of very small pyramidal projections having {001} facet planes on the {111} faces. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP LEE, JH (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011, USA. NR 4 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 1044-5803 J9 MATER CHARACT JI Mater. Charact. PD OCT PY 1992 VL 29 IS 3 BP 285 EP 292 DI 10.1016/1044-5803(92)90100-V PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Materials Science, Characterization & Testing SC Materials Science; Metallurgy & Metallurgical Engineering GA JZ926 UT WOS:A1992JZ92600003 ER PT J AU VERHOEVEN, JD PETERSON, DT AF VERHOEVEN, JD PETERSON, DT TI WHAT IS A DAMASCUS STEEL SO MATERIALS CHARACTERIZATION LA English DT Letter AB The comments by Wadsworth and Sherby (W-S) on our recent article that attempted to use their method to make Damascus blades raise questions about what constitutes a genuine Damascus blade. Seven characteristics of a genuine Damascus blade are proposed, and data are presented on a new genuine blade recently given to the authors for study. The criticisms of W-S on our article are then discussed. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP VERHOEVEN, JD (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011, USA. NR 16 TC 10 Z9 10 U1 1 U2 6 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 1044-5803 J9 MATER CHARACT JI Mater. Charact. PD OCT PY 1992 VL 29 IS 3 BP 335 EP 341 DI 10.1016/1044-5803(92)90105-Q PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Materials Science, Characterization & Testing SC Materials Science; Metallurgy & Metallurgical Engineering GA JZ926 UT WOS:A1992JZ92600008 ER PT J AU RANDALL, CA MIYAZAKI, S MORE, KL BHALLA, AS NEWNHAM, RE AF RANDALL, CA MIYAZAKI, S MORE, KL BHALLA, AS NEWNHAM, RE TI STRUCTURAL-PROPERTY RELATIONSHIPS IN DIELECTROPHORETICALLY ASSEMBLED BATIO3 NANOCOMPOSITES SO MATERIALS LETTERS LA English DT Article ID SIZE AB Using the dielectrophoretic effect, submicron BaTiO3 powders dispersed in an uncured silicone elastomer could be redispersed into an aligned composite. The cured and aligned composites were microtomed into thin sections and characterized using electron and optical microscopy. Dielectric characterizations of the aligned composites were also studied and modelled using the conventional dielectric mixing rules. Both the microscopy and dielectric characterization suggested the alignment of BaTiO3 particles in a quasi 1-3 connectivity pattern parallel to the direction of the applied electric field. C1 SUMITOMO CHEM CO LTD,TSUKUBA RES LAB,TSUKUBA,IBARAKI 30032,JAPAN. OAK RIDGE NATL LAB,HIGH TEMP MAT LAB,OAK RIDGE,TN 37830. RP RANDALL, CA (reprint author), PENN STATE UNIV,MAT RES LAB,UNIV PK,PA 16802, USA. RI More, Karren/A-8097-2016 OI More, Karren/0000-0001-5223-9097 NR 8 TC 16 Z9 16 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-577X J9 MATER LETT JI Mater. Lett. PD OCT PY 1992 VL 15 IS 1-2 BP 26 EP 30 DI 10.1016/0167-577X(92)90006-6 PG 5 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA JT719 UT WOS:A1992JT71900005 ER PT J AU KEARNS, JT CLAYTON, CR HALADA, GP GILLOW, JB FRANCIS, AJ AF KEARNS, JT CLAYTON, CR HALADA, GP GILLOW, JB FRANCIS, AJ TI APPLICATION OF XPS TO THE STUDY OF MIC SO MATERIALS PERFORMANCE LA English DT Article AB The biotic and abiotic factors that contribute to microbiologically influenced corrosion (MIC) involve the transformation of chemical species at a metal surface. X-ray photoelectron spectroscopy (XPS) is used in conjunction with conventional microbiological and quantitative chemical analytical techniques to better understand the effect of environmental conditions on microbial behavior as well as the ability of bacteria to alter local environmental conditions. Specifically, the interaction of Fe, Cr, Ni, Mo ions with Desulfovibrio sp. under anoxic conditions were studied. This is the first phase of a systematic study of microbial activity and the effects of alloy elements and thermomechanical treatments on the MIC resistance of stainless steels. C1 SUNY NEW YORK,DEPT MAT SCI,NEW YORK,NY 11973. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP KEARNS, JT (reprint author), ALLEGHENY LUDLUM CORP,CTR TECH,BRACKENRIDGE,PA 15014, USA. NR 4 TC 3 Z9 4 U1 0 U2 1 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0094-1492 J9 MATER PERFORMANCE JI Mater. Perform. PD OCT PY 1992 VL 31 IS 10 BP 48 EP 51 PG 4 WC Materials Science, Characterization & Testing SC Materials Science GA JV828 UT WOS:A1992JV82800009 ER PT J AU LIU, M FINLAYSON, TR SMITH, TF TANNER, LE AF LIU, M FINLAYSON, TR SMITH, TF TANNER, LE TI MARTENSITE PRECURSOR OBSERVATIONS USING THERMAL-EXPANSION - NI-AL SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID NEUTRON-SCATTERING; TRANSFORMATION; ALLOYS; PHASE; BEHAVIOR; MICROSTRUCTURES AB Measurements of thermal expansion, in the temperature range 2-300 K, were made along the three [100] directions of the cubic phase of a martensitically transforming Ni0.625Al0.375 single crystal. Anisotropic and anomalous expansion for the three different directions were observed at temperatures about 115 K above the transformation temperature, of approximately 85 K. Optical observation showed that the onset temperature for the anomalous expansion is consistent with the temperature at which surface tilts appear and that the anisotropic expansion is due to the preferential selection of orientation of the martensite variants in the crystal. The amplitude of the observed anisotropy varies with applied stress which suggests that the relative fractions of the variants in the crystal with preferential orientation are stress dependent. C1 LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550. RP LIU, M (reprint author), MONASH UNIV,DEPT PHYS,CLAYTON,VIC 3168,AUSTRALIA. RI sebastianovitsch, stepan/G-8507-2013 NR 26 TC 16 Z9 16 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 OCT 1 PY 1992 VL 157 IS 2 BP 225 EP 232 DI 10.1016/0921-5093(92)90029-Z PG 8 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JU266 UT WOS:A1992JU26600010 ER PT J AU MILLER, MK BURKE, MG AF MILLER, MK BURKE, MG TI THE MISCIBILITY GAP IN THE FEBE SYSTEM SO MICROSCOPY MICROANALYSIS MICROSTRUCTURES LA English DT Article ID FIELD-ION MICROSCOPY; MODULATED MICROSTRUCTURES; ATOM PROBE AB The technique of atom probe field ion microscopy has been used to estimate the position of the low temperature miscibility gap in the iron-rich portion of the iron-beryllium system by direct measurement of the compositions of the phases. The morphology of the two phases produced by spinodal decomposition within this miscibility gap was determined to be a dislocated macrolattice of isolated cuboidal particles of the iron-rich alpha phase embedded in a matrix of the B2-ordered beryllium-enriched FeBe phase. Atom probe measurements indicated that there was a significant variation in the compositions of the coexisting phases and the differences in the beryllium contents between the phases increased with aging time at 350 and 400-degrees-C. C1 WESTINGHOUSE ELECT CORP,CTR SCI & TECHNOL,PITTSBURGH,PA 15235. RP MILLER, MK (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 14 TC 2 Z9 2 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 1154-2799 J9 MICROSC MICROANAL M JI Microsc. Microanal. Microstruct. PD OCT PY 1992 VL 3 IS 5 BP 387 EP 400 DI 10.1051/mmm:0199200305038700 PG 14 WC Microscopy; Spectroscopy SC Microscopy; Spectroscopy GA KM452 UT WOS:A1992KM45200002 ER PT J AU BASKES, MI AF BASKES, MI TI UNTITLED SO MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING LA English DT Editorial Material C1 SANDIA NATL LABS,LIVERMORE,CA 94550. NR 0 TC 0 Z9 0 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0965-0393 J9 MODEL SIMUL MATER SC JI Model. Simul. Mater. Sci. Eng. PD OCT PY 1992 VL 1 IS 1 BP U1 EP U1 PG 1 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA MP244 UT WOS:A1992MP24400001 ER PT J AU DIAZ, A LACKS, SA LOPEZ, P AF DIAZ, A LACKS, SA LOPEZ, P TI THE 5' TO 3' EXONUCLEASE ACTIVITY OF DNA-POLYMERASE-I IS ESSENTIAL FOR STREPTOCOCCUS-PNEUMONIAE SO MOLECULAR MICROBIOLOGY LA English DT Article ID ESCHERICHIA-COLI; POLA GENE; BACILLUS-SUBTILIS; EXCISION-REPAIR; DIPLOCOCCUS-PNEUMONIAE; THERMUS-AQUATICUS; EXPRESSION; CLONING; TRANSFORMATION; IDENTIFICATION AB Three different mutations were introduced in the polA gene of Streptococcus pneumoniae by chromosomal transformation. One mutant gene encodes a truncated protein that possesses 5' to 3' exonuclease but has lost polymerase activity. This mutation does not affect cell viability. Other mutated forms of polA that encode proteins with only polymerase activity or with no enzymatic activity could not substitute for the wild-type polA gene in the chromosome unless the 5' to 3' exonuclease domain was encoded elsewhere in the chromosome. Thus, it appears that the 5' to 3' exonuclease activity of the DNA polymerase I is essential for cell viability in S. pneumoniae. Absence of the polymerase domain of DNA polymerase I slightly diminished the ability of S. pneumoniae to repair DNA lesions after ultraviolet irradiation. However, the polymerase domain of the pneumococcal DNA polymerase I gave almost complete complementation of the polA5 mutation in Escherichia coli with respect to resistance to ultraviolet irradiation. C1 CSIC,CTR INVEST BIOL,VELAZQUEZ 144,E-28006 MADRID,SPAIN. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RI Lopez Garcia, Paloma/L-1583-2014 OI Lopez Garcia, Paloma/0000-0001-8755-8952 FU NIAID NIH HHS [AI14885] NR 36 TC 24 Z9 24 U1 0 U2 1 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0950-382X J9 MOL MICROBIOL JI Mol. Microbiol. PD OCT PY 1992 VL 6 IS 20 BP 3009 EP 3019 DI 10.1111/j.1365-2958.1992.tb01759.x PG 11 WC Biochemistry & Molecular Biology; Microbiology SC Biochemistry & Molecular Biology; Microbiology GA JV234 UT WOS:A1992JV23400012 PM 1336089 ER PT J AU MUROPASTOR, AM FLORES, E HERRERO, A WOLK, CP AF MUROPASTOR, AM FLORES, E HERRERO, A WOLK, CP TI IDENTIFICATION, GENETIC-ANALYSIS AND CHARACTERIZATION OF A SUGAR-NONSPECIFIC NUCLEASE FROM THE CYANOBACTERIUM ANABAENA SP PCC-7120 SO MOLECULAR MICROBIOLOGY LA English DT Article ID SP-STRAIN PCC-7120; ESCHERICHIA-COLI; SACCHAROMYCES-CEREVISIAE; CLONING; VECTORS; CONSTRUCTION; SEQUENCES; PROTEIN; TRANSFORMATION; MUTAGENESIS AB A nuclease that could be recovered from the supernatant of cultures, as well as from cell-free extracts, of the cyanobacterium Anabaena sp. PCC 7120 was identified as a 29 kDa polypeptide by its ability to degrade DNA after electrophoresis in DNA-containing SDS-polyacrylamide gels. Some clones of a gene library of strain PCC 7120 established in Escherichia coli were found to produce the 29 kDa nuclease. The nucA gene encoding this nuclease was subcloned and sequenced. The deduced polypeptide, NucA, had a molecular weight of 29650, presented a presumptive signal peptide in its N-terminal region and showed homology to the products of the nuc gene from Serratia marcescens and the NUC1 gene from Saccharomyces cerevisiae. The NucA protein from Anabaena itself, or from the cloned nucA gene expressed in E. coli, catalysed the degradation of both RNA and DNA, had the potential to act as an endonuclease, and functioned best in the presence of Mn2+ or Mg2+. An Anabaena nucA insertional mutant was generated which failed to produce the 29 kDa nuclease. C1 UNIV SEVILLA,FAC BIOL,CSIC,INST BIOQUIM VEGETAL & FOTOSINTESIS,APARTADO 1113,E-41080 SEVILLE,SPAIN. MICHIGAN STATE UNIV,US DEPT ENERGY,PLANT RES LAB,E LANSING,MI 48824. MICHIGAN STATE UNIV,CTR MICROBIAL ECOL,E LANSING,MI 48824. RI Muro-Pastor, Alicia/A-4445-2015; Herrero, Antonia/B-7246-2015; Flores, Enrique/L-2007-2014 OI Muro-Pastor, Alicia/0000-0003-2503-6336; Herrero, Antonia/0000-0003-1071-6590; Flores, Enrique/0000-0001-7605-7343 NR 37 TC 64 Z9 68 U1 1 U2 5 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0950-382X J9 MOL MICROBIOL JI Mol. Microbiol. PD OCT PY 1992 VL 6 IS 20 BP 3021 EP 3030 DI 10.1111/j.1365-2958.1992.tb01760.x PG 10 WC Biochemistry & Molecular Biology; Microbiology SC Biochemistry & Molecular Biology; Microbiology GA JV234 UT WOS:A1992JV23400013 PM 1343821 ER PT J AU BASKES, MI AF BASKES, MI TI WHY ANOTHER NEW JOURNAL SO MRS BULLETIN LA English DT Editorial Material RP BASKES, MI (reprint author), SANDIA NATL LABS,DEPT MAT & PROC RES,POB 969,LIVERMORE,CA 94551, USA. NR 1 TC 0 Z9 0 U1 1 U2 2 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD OCT PY 1992 VL 17 IS 10 BP 11 EP 12 PG 2 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA JT063 UT WOS:A1992JT06300001 ER PT J AU ALPER, M AF ALPER, M TI BIOLOGY AND MATERIALS .1. SO MRS BULLETIN LA English DT Editorial Material C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. RP ALPER, M (reprint author), LAWRENCE BERKELEY LAB,ENZYMAT SYNTH PROGRAM,BERKELEY,CA 94720, USA. NR 0 TC 3 Z9 4 U1 0 U2 1 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD OCT PY 1992 VL 17 IS 10 BP 24 EP 24 PG 1 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA JT063 UT WOS:A1992JT06300003 ER PT J AU CALLSTROM, MR BEDNARSKI, MD AF CALLSTROM, MR BEDNARSKI, MD TI NEW CARBOHYDRATE-BASED POLYMERIC MATERIALS SO MRS BULLETIN LA English DT Article ID PROTEIN; PEPTIDE; OLIGOSACCHARIDES; CONDENSATION; PROTEASES C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP CALLSTROM, MR (reprint author), OHIO STATE UNIV,CHEM,COLUMBUS,OH 43210, USA. NR 32 TC 4 Z9 4 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD OCT PY 1992 VL 17 IS 10 BP 54 EP 59 PG 6 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA JT063 UT WOS:A1992JT06300009 ER PT J AU BENDER, MA PRESTON, RJ LEONARD, RC PYATT, BE GOOCH, PC AF BENDER, MA PRESTON, RJ LEONARD, RC PYATT, BE GOOCH, PC TI INFLUENCE OF WHITE BLOOD-CELL COUNT ON SCE FREQUENCY IN PERIPHERAL LYMPHOCYTES SO MUTATION RESEARCH LA English DT Article DE SISTER-CHROMATID EXCHANGE; LYMPHOCYTES; HUMAN PERIPHERAL BLOOD; 5-BROMODEOXYURIDINE ID CHROMATID EXCHANGE FREQUENCIES; HUMAN-POPULATION SAMPLE; CHROMOSOMAL ABERRATION C1 CHEM IND INST TOXICOL,RES TRIANGLE PK,NC 27709. ARCO CHEM CO,DEPT ENVIRONM HLTH & SAFETY,NEWTOWN SQ,PA 19073. OAK RIDGE NATL LAB,ENVIRONM SAFETY & HLTH COMPLIANCE,OAK RIDGE,TN 37831. RP BENDER, MA (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. FU NIEHS NIH HHS [Y01-ES-20101, Y01-ES-20099] NR 8 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8262 J9 MUTAT RES PD OCT PY 1992 VL 283 IS 2 BP 87 EP 89 DI 10.1016/0165-7992(92)90138-8 PG 3 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA JP957 UT WOS:A1992JP95700001 PM 1381493 ER PT J AU BOWMAN, KO KASTENBAUM, MA AF BOWMAN, KO KASTENBAUM, MA TI OVERDISPERSION OF AGGREGATED GENETIC DATA SO MUTATION RESEARCH LA English DT Article DE AGGREGATED DATA; CHROMOSOMAL ABERRATIONS; OVERDISPERSION RP BOWMAN, KO (reprint author), OAK RIDGE NATL LAB,MATH SCI SECT,OAK RIDGE,TN 37831, USA. NR 7 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8262 J9 MUTAT RES PD OCT PY 1992 VL 272 IS 2 BP 133 EP 137 DI 10.1016/0165-1161(92)90041-J PG 5 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA JT717 UT WOS:A1992JT71700005 PM 1383745 ER PT J AU HANSON, PJ GARTEN, CT AF HANSON, PJ GARTEN, CT TI DEPOSITION OF H15NO3 VAPOR TO WHITE OAK, RED MAPLE AND LOBLOLLY-PINE FOLIAGE - EXPERIMENTAL-OBSERVATIONS AND A GENERALIZED-MODEL SO NEW PHYTOLOGIST LA English DT Article DE DRY DEPOSITION; LEAF CONDUCTANCE; MODEL; NITRIC ACID VAPOR ID DRY DEPOSITION; NITRIC-ACID; ATMOSPHERIC DEPOSITION; HNO3 VAPOR; FOREST; CANOPY; POLLUTANTS; SURFACES; STROBUS; NITRATE AB Nitric acid vapour enriched with N-15 ((HNO3))-N-15 was volatilized into the cuvette of an open-flow gas exchange system containing red maple (Acer rubrum L.), white oak (Quercus alba L.), or loblolly pine (Pinus taeda L.) seedling shoots to facilitate direct measurements of total foliar deposition, and subsequent assessments of the rate of HNO3, movement across the cuticle (transcuticular uptake). Total (HNO3)-N-15 vapour deposition to foliar surfaces ranged from < 5 to 27 nmol m-2 s-1, the variability being largely accounted for by differences in HNO3 concentrations and leaf conductance. Mean whole-leaf conductance to HNO3 ranged between 0.9 and 3.4 mm s-1 for hardwoods and between 6 and 34 mm s-1 for loblolly pine. Of the total (HNO3)-N-15 vapour deposited to leaves, an average of 3 9 to 48% was immediately 'bound' into hardwood foliage whereas only 3% was bound to loblolly pine needles. This implies that rain events might extract greater amounts of HNO3-derived nitrate in throughfall from conifer canopies as compared to hardwood canopies. Post-exposure (HNO3)-N-15 uptake rates across the leaf cuticle increased with surface nitrate concentrations, but were 1 to 2 orders of magnitude lower (0.06 to 0.24 nmol m-1 s-1) than total HNO3 deposition during exposures. A generalized leaf-level model of HNO3 deposition to foliage capable of simulating deposition pathways to sorption sites on the leaf surface, and to the metabolically active leaf interior via transcuticular or stomatal pathways is formulated and suggested for use in planning future work on HNO3 deposition. RP HANSON, PJ (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Hanson, Paul J./D-8069-2011 OI Hanson, Paul J./0000-0001-7293-3561 NR 34 TC 34 Z9 36 U1 0 U2 2 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0028-646X J9 NEW PHYTOL JI New Phytol. PD OCT PY 1992 VL 122 IS 2 BP 329 EP 337 DI 10.1111/j.1469-8137.1992.tb04238.x PG 9 WC Plant Sciences SC Plant Sciences GA JV736 UT WOS:A1992JV73600012 ER PT J AU KELLY, DL PAFFORD, DJ SCHROEDER, JA JONES, KR AF KELLY, DL PAFFORD, DJ SCHROEDER, JA JONES, KR TI SIMPLIFIED METHODOLOGY FOR ASSESSING THE RISK IMPACT OF POTENTIAL PERFORMANCE IMPROVEMENTS FOR THE DRY PRESSURIZED WATER-REACTOR CONTAINMENT SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB This paper presents a simplified methodology for calculating the risk benefit associated with potential performance improvements for the dry pressurized water reactor (PWR) containment. The analysis is based on the June 1989 draft NUREG-1150 results for the Zion commercial nuclear reactor. Simplified containment event trees and the large accident progression event trees from draft NUREG-1150 are used to evaluate the effects of potential improvements on the response of the Zion containment to dominant severe accident sequences. Source terms are generated parametrically using the ZISOR code and offsite consequences are calculated with the MELCOR Accident Consequence Code System (MACCS). These results give point estimates of the risk reduction associated with each containment improvement identified by Brookhaven National Laboratory in their draft Issues Characterization Report. RP KELLY, DL (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 15 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD OCT PY 1992 VL 137 IS 2 BP 229 EP 247 DI 10.1016/0029-5493(92)90022-N PG 19 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JV868 UT WOS:A1992JV86800010 ER PT J AU PINSKER, RI COLESTOCK, PL AF PINSKER, RI COLESTOCK, PL TI EFFECT OF SURFACE-MODES ON COUPLING TO FAST WAVES IN THE LOWER HYBRID RANGE OF FREQUENCIES SO NUCLEAR FUSION LA English DT Article ID CURRENT DRIVE; TOKAMAK; TORUS; SLOW AB The effect of surface modes of propagation on coupling to fast waves in the lower hybrid range of frequencies is studied theoretically and experimentally. The previously reported 'up-down' poloidal phasing asymmetry for coupling to a uniform plasma is shown to be due to the properties of a mode which carries energy along the interface between the plasma and the conducting wall. Comparison of the theory with coupling experiments performed on the PLT tokamak with a phased array of twelve dielectric loaded waveguides at 800 MHz shows that the observed dependence of the net reflection coefficient on toroidal phase angle can be explained only if the surface wave is taken into account. C1 PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544. NR 39 TC 15 Z9 15 U1 0 U2 1 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD OCT PY 1992 VL 32 IS 10 BP 1789 EP 1799 DI 10.1088/0029-5515/32/10/I07 PG 11 WC Physics, Fluids & Plasmas SC Physics GA JY298 UT WOS:A1992JY29800007 ER PT J AU ALIKAEV, VV BAGDASAROV, AA BORSHEGOVSKIJ, AA DREMIN, MM GORELOV, YA ESIPCHUK, YV KISLOV, AY KISLOV, DA LYSENKO, SE NOTKIN, GE PARAIL, VV RAZUMOVA, KA ROJ, IN TRUKHIN, VM VASIN, NL DENISOV, GG PETELIN, MI FLYAGIN, VA LOHR, JM HARVEY, RW JAMES, RA AF ALIKAEV, VV BAGDASAROV, AA BORSHEGOVSKIJ, AA DREMIN, MM GORELOV, YA ESIPCHUK, YV KISLOV, AY KISLOV, DA LYSENKO, SE NOTKIN, GE PARAIL, VV RAZUMOVA, KA ROJ, IN TRUKHIN, VM VASIN, NL DENISOV, GG PETELIN, MI FLYAGIN, VA LOHR, JM HARVEY, RW JAMES, RA TI ELECTRON-CYCLOTRON CURRENT DRIVE EXPERIMENTS ON T-10 SO NUCLEAR FUSION LA English DT Article ID CURRENT GENERATION; TRAPPED ELECTRONS; WAVES; TOKAMAKS; FIELD AB The results of electron cyclotron current drive experiments on the T-10 tokamak are presented. The total RF power was up to 2.5 MW, the electron temperature was up to 7 keV and the maximum driven current was 110 kA. The current drive efficiency eta(CD) was approximately 0.1 A/W. The value of eta(CD) and its dependence on the plasma parameters agree satisfactorily with the linear theory, corrected for the finite confinement time of resonant electrons. In discharges with large beta poloidal, beta(p) congruent-to 3, complete replacement of the inductive current by non-inductive electron cyclotron current drive and bootstrap current was obtained. C1 NIZHNYJ NOVGOROD APPL PHYS INST, NIZHNYJ NOVGOROD, USSR. GEN ATOM CO, SAN DIEGO, CA 92138 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP ALIKAEV, VV (reprint author), IV KURCHATOV ATOM ENERGY INST, MOSCOW, USSR. NR 21 TC 39 Z9 41 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD OCT PY 1992 VL 32 IS 10 BP 1811 EP 1821 DI 10.1088/0029-5515/32/10/I09 PG 11 WC Physics, Fluids & Plasmas SC Physics GA JY298 UT WOS:A1992JY29800009 ER PT J AU ZWEBEN, SJ HAMMETT, GW BOIVIN, RL PHILLIPS, CK WILSON, JR AF ZWEBEN, SJ HAMMETT, GW BOIVIN, RL PHILLIPS, CK WILSON, JR TI LOSS OF MEV IONS DURING HE-3 MINORITY ION-CYCLOTRON RESONANCE HEATING IN TFTR SO NUCLEAR FUSION LA English DT Article ID PLT; PLASMAS; TRANSPORT; BEHAVIOR; TOKAMAKS; ICRF AB The loss of D-He-3 alpha particles to the bottom of TFTR during He-3 minority ion cyclotron resonance heating (ICRH) is measured and shown to be consistent with first-orbit loss. However, an anomalous loss also occurs 45-degrees below the outer midplane, which may be due either to a small amount of minority tail ion loss or to ICRH induced deconfinement of fusion products. RP ZWEBEN, SJ (reprint author), PRINCETON UNIV, PRINCETON PLASMA PHYS LAB, PRINCETON, NJ 08544 USA. RI Hammett, Gregory/D-1365-2011 OI Hammett, Gregory/0000-0003-1495-6647 NR 28 TC 12 Z9 12 U1 1 U2 4 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD OCT PY 1992 VL 32 IS 10 BP 1823 EP 1833 DI 10.1088/0029-5515/32/10/I10 PG 11 WC Physics, Fluids & Plasmas SC Physics GA JY298 UT WOS:A1992JY29800010 ER PT J AU TAYLOR, G BUSH, CE FREDRICKSON, ED PARK, HK RAMSEY, AT AF TAYLOR, G BUSH, CE FREDRICKSON, ED PARK, HK RAMSEY, AT TI INTENSE ELECTRON-CYCLOTRON EMISSION BURSTS DURING HIGH-POWER NEUTRAL BEAM HEATING ON TFTR SO NUCLEAR FUSION LA English DT Letter ID FUSION TEST REACTOR; TOKAMAK; INTERFEROMETER; PLASMAS AB A 20 channel grating polychromator has been used to study intense bursts of electron cyclotron emission (ECE) from TFTR deuterium plasmas predominantly heated by 90-110 keV neutral beams (P(inj)/P(oh) > 30). The ECE bursts have a duration of 20-150 mus and are usually seen 300-500 ms after the start of neutral beam injection, when the stored energy and neutron production are collapsing or rolling over. In most cases the ECE bursts have DELTAf/f is similar to 0.2-0.5. Core electron temperatures in these plasmas are typically 7-12 keV. The ECE bursts are often correlated with ELM activity during limiter H-modes and appear near the beginning of the rise in the D(alpha) signal. In some instances the spectral width of the ECE burst is narrow (DELTAf/f much less than 0.1). In these cases the ECE burst exhibits a delay which could be interpreted as an outwardly directed motion of the source with a velocity of (2-3) X 10(3) m/s. RP TAYLOR, G (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. NR 14 TC 16 Z9 16 U1 3 U2 5 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD OCT PY 1992 VL 32 IS 10 BP 1867 EP 1872 DI 10.1088/0029-5515/32/10/I16 PG 6 WC Physics, Fluids & Plasmas SC Physics GA JY298 UT WOS:A1992JY29800016 ER PT J AU AUBERT, B BAZAN, A BEAUGIRAUD, B COLAS, J LEFLOUR, T MAIRE, M VIALLE, JP WINGERTERSEEZ, I ZOLNIEROWSKI, YP GORDON, HA RADEKA, V RAHM, D STEPHANI, D CHEVALLEY, JL FABJAN, CW FOURNIER, D FRANZ, A GILDEMEISTER, O JENNI, P NESSI, M NESSITEDALDI, F PEPE, M RICHTER, W SODERQVIST, J BAZE, JM GOSSET, L LAVOCAT, P LOTTIN, JP MANSOULIE, B MEYER, JP RENARDY, JF TEIGER, J ZACCONE, H BATTISTONI, G CAMIN, DV CAVALLI, D COSTA, G CRAVERO, A FERRARI, A GIANOTTI, F MANDELLI, L MAZZANTI, M PERINI, L PESSINA, G SALA, P SCIAMANNA, M AUGE, E CHASE, R CHOLLET, JC DELATAILLE, C FAYARD, L JEAN, P ICONOMIDOUFAYARD, L MERKEL, B NOPPE, JM PARROUR, G PETROFF, P REPELLIN, JP SCHAFFER, A SEGUIN, N UNAL, G FUGLESANG, C LEFEBVRE, M TOWERS, S AF AUBERT, B BAZAN, A BEAUGIRAUD, B COLAS, J LEFLOUR, T MAIRE, M VIALLE, JP WINGERTERSEEZ, I ZOLNIEROWSKI, YP GORDON, HA RADEKA, V RAHM, D STEPHANI, D CHEVALLEY, JL FABJAN, CW FOURNIER, D FRANZ, A GILDEMEISTER, O JENNI, P NESSI, M NESSITEDALDI, F PEPE, M RICHTER, W SODERQVIST, J BAZE, JM GOSSET, L LAVOCAT, P LOTTIN, JP MANSOULIE, B MEYER, JP RENARDY, JF TEIGER, J ZACCONE, H BATTISTONI, G CAMIN, DV CAVALLI, D COSTA, G CRAVERO, A FERRARI, A GIANOTTI, F MANDELLI, L MAZZANTI, M PERINI, L PESSINA, G SALA, P SCIAMANNA, M AUGE, E CHASE, R CHOLLET, JC DELATAILLE, C FAYARD, L JEAN, P ICONOMIDOUFAYARD, L MERKEL, B NOPPE, JM PARROUR, G PETROFF, P REPELLIN, JP SCHAFFER, A SEGUIN, N UNAL, G FUGLESANG, C LEFEBVRE, M TOWERS, S TI PERFORMANCE OF A LIQUID ARGON ACCORDION CALORIMETER WITH FAST READOUT SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB A prototype lead-liquid-argon electromagnetic calorimeter with parallel plates and Accordion geometry has been equipped with high speed readout electronics and tested with electron and muon beams at the CERN SPS. For a response peaking time of about 35 ns, fast enough for operation at the future hadron colliders, the energy resolution for electrons is 9.6%/ square-root E[GeV] with a local constant term of 0.3% and a noise contribution of 0.33/E[GeV]. The spatial accuracy achieved with a detector granularity of 2.7 cm is 3.7 mm/ square-root E[GeV] and the angular resolution 12 mrad at 60 GeV. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. CERN,CH-1211 GENEVA 23,SWITZERLAND. DAPNIA SPP SACLAY,GIF SUR YVETTE,FRANCE. NATL INST NUCL PHYS,SEZ,MILAN,ITALY. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. LAL,ORSAY,FRANCE. MANNE SIEGBAHN INST,STOCKHOLM,SWEDEN. UNIV VICTORIA,VICTORIA V8W 2Y2,BC,CANADA. RP AUBERT, B (reprint author), LAB ANNECY LE VIEUX PHYS PARTICULES,ANNECY,FRANCE. RI sala, paola/E-2868-2013; OI sala, paola/0000-0001-9859-5564; Pessina, Gianluigi Ezio/0000-0003-3700-9757 NR 10 TC 26 Z9 26 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD OCT 1 PY 1992 VL 321 IS 3 BP 467 EP 478 DI 10.1016/0168-9002(92)90056-A PG 12 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JR507 UT WOS:A1992JR50700008 ER PT J AU HAUSER, J LINDGREN, M MULLER, T NEUBERGER, D ALBROW, M DRAKE, G FREEMAN, J KIM, DH LIMON, PJ FUKUI, Y MISHINA, M BARNES, V LAASENEN, A DEBARBARO, P BODEK, A BUDD, HS FAN, Q SAKUMOTO, WK WINER, B APOLLINARI, G GOULIANOS, K WANG, QF WHITE, S PAULETTA, C AF HAUSER, J LINDGREN, M MULLER, T NEUBERGER, D ALBROW, M DRAKE, G FREEMAN, J KIM, DH LIMON, PJ FUKUI, Y MISHINA, M BARNES, V LAASENEN, A DEBARBARO, P BODEK, A BUDD, HS FAN, Q SAKUMOTO, WK WINER, B APOLLINARI, G GOULIANOS, K WANG, QF WHITE, S PAULETTA, C TI A SCINTILLATING FIBER DETECTOR FOR ELECTRON AND PHOTON IDENTIFICATION AT HIGH LUMINOSITY COLLIDERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB We report on the construction and first operating experience of a novel detector designed to measure with high accuracy the spatial position of charged particle trajectories and of electromagnetic showers from electrons or photons. This position detector was constructed of two layers of 2 mm thick scintillating fibers with a 15-degrees angle between layers. The photon readout used a newly developed multianode photomultiplier. The device was inserted in a prototype electromagnetic calorimeter for the CDF collaboration and studied at a Fermilab test beam facility. The position detector yielded a spatial resolution for electromagnetic showers of 400 mum for 100 GeV electrons. C1 FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. KEK NAT LAB HIGH ENERGY PHYS,NATL LAB HIGH ENERGY PHYS,TSUKUBA,JAPAN. PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907. UNIV ROCHESTER,DEPT PHYS & ASTRON,ROCHESTER,NY 14627. ROCKEFELLER UNIV,DEPT PHYS,NEW YORK,NY 10021. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. RP HAUSER, J (reprint author), UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024, USA. NR 11 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD OCT 1 PY 1992 VL 321 IS 3 BP 497 EP 503 DI 10.1016/0168-9002(92)90059-D PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JR507 UT WOS:A1992JR50700011 ER PT J AU COLONNA, N WOZNIAK, GJ VEECK, A SKULSKI, W GOTH, GW MANDUCI, L MILAZZO, PM MASTINU, PF AF COLONNA, N WOZNIAK, GJ VEECK, A SKULSKI, W GOTH, GW MANDUCI, L MILAZZO, PM MASTINU, PF TI CALIBRATION OF THE RESPONSE FUNCTION OF CSI(TL) SCINTILLATORS TO INTERMEDIATE-ENERGY HEAVY-IONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID LIGHT CHARGED-PARTICLE; MULTIDETECTOR SYSTEM; PHOTODIODE READOUT; DWARF BALL; INSTRUMENTATION; CYCLOTRON; DETECTORS; DESIGN; ARRAY; RANGE AB The response function of 2-cm-thick CsI(TI) scintillators with photodiode readouts were studied by directly exposing the detectors to beams of heavy ions (2 less-than-or-equal-to Z less-than-or-equal-to 36) with energy up to 25 MeV/u. The dependence of the light output on the energy (E) as well as on the atomic number and the mass of the ion is analyzed and discussed, and a parameterization of the light output as a function of Z and E is proposed. C1 IST NAZL FIS NUCL,I-20133 MILAN,ITALY. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. RP COLONNA, N (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,1 CYLCOTRON RD,BERKELEY,CA 94704, USA. NR 22 TC 42 Z9 44 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD OCT 1 PY 1992 VL 321 IS 3 BP 529 EP 534 DI 10.1016/0168-9002(92)90063-A PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JR507 UT WOS:A1992JR50700015 ER PT J AU BERMAN, LE HART, M SHARMA, S AF BERMAN, LE HART, M SHARMA, S TI ADAPTIVE CRYSTAL OPTICS FOR UNDULATOR BEAMLINES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID X-RAY MONOCHROMATORS; PERFORMANCE; SILICON AB These are the first tests of an X-ray monochromator with incident beam X-ray photon powers in excess of 100 W/mm2. Crystal monochromators cannot be 100% efficient unless the thermal strain within the beam is small compared with the Darwin range of total Bragg reflection. At room temperature in all materials such performance is impossible unless adaptive optics methods are used to compensate the inevitable strain field which results from the X-ray beam power footprint. Third generation synchrotron radiation sources incorporating undulators will produce X-ray beams with power densities in excess of 100 W/mm2. The 1.1 T hybrid 27 pole wiggler (X25) at the National Synchrotron Light Source, when doubly focussed, provides a unique test facility for optical components intended for third generation synchrotron radiation beam lines. At the focus the power density reaches 200 W/mm2. Normal to the beam the power density gradient is far greater than that predicted for future undulator beamlines so that this beam presents a "worst case" test for undulator beam optical components. We present a new design which copes well with these high power densities and has diffraction characteristics which agree quantitatively with design calculations. It therefore follows that we can extrapolate from these results and predict monochromator performance on future insertion devices. C1 UNIV MANCHESTER,SCHUSTER LAB,DEPT PHYS,MANCHESTER M13 9PL,LANCS,ENGLAND. RP BERMAN, LE (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 25 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD OCT 1 PY 1992 VL 321 IS 3 BP 617 EP 628 DI 10.1016/0168-9002(92)90074-E PG 12 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JR507 UT WOS:A1992JR50700026 ER PT J AU BALLINGER, CT CULLEN, DE PERKINS, ST RATHKOPF, JA MARTIN, WR WILDERMAN, SJ AF BALLINGER, CT CULLEN, DE PERKINS, ST RATHKOPF, JA MARTIN, WR WILDERMAN, SJ TI SINGLE-SCATTER MONTE-CARLO COMPARED TO CONDENSED HISTORY RESULTS FOR LOW-ENERGY ELECTRONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article AB A Monte Carlo code has been developed to simulate individual electron interactions. The code has been instrumental in determining the range of validity for the widely used condensed history method. This task was accomplished by isolating and testing the condensed history assumptions. The results show that the condensed history method fails for low energy electron transport due to inaccuracies in energy loss and spatial positioning. C1 LAWRENCE LIVERMORE NATL LAB,POB 808,L-18,LIVERMORE,CA 94550. UNIV MICHIGAN,DEPT NUCL ENGN,ANN ARBOR,MI 48109. NR 20 TC 9 Z9 9 U1 2 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD OCT PY 1992 VL 72 IS 1 BP 19 EP 27 DI 10.1016/0168-583X(92)95275-V PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JX543 UT WOS:A1992JX54300004 ER PT J AU GLIKMAN, E KELSON, I DOAN, NV PICCOT, D PINTE, G HAUSTEIN, PE AF GLIKMAN, E KELSON, I DOAN, NV PICCOT, D PINTE, G HAUSTEIN, PE TI DESORPTION FROM SURFACES INDUCED BY NEUTRON-CAPTURE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID MOLECULAR-DYNAMICS CALCULATIONS AB Desorption of atoms from a gold surface induced by recoil imparted during (n, gamma) reactions is considered. Results of an idealized molecular dynamics calculation are given as well as results of a series of experiments carried out under intense neutron irradiation. The methodological aspects of both theory and experiment are discussed, and suitable new elements for further experimentation are suggested. C1 TEL AVIV UNIV,RAYMOND & BEVERLY SACKLER FAC EXACT SCI,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. CTR ETUDES SACLAY,CEREM,DTM,SRMP,F-91191 GIF SUR YVETTE,FRANCE. CTR ETUDES SACLAY,LAB PIERRE SUE,F-91191 GIF SUR YVETTE,FRANCE. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 20 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD OCT PY 1992 VL 72 IS 1 BP 33 EP 39 DI 10.1016/0168-583X(92)95277-X PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JX543 UT WOS:A1992JX54300006 ER PT J AU JERVIS, TR LU, HL TESMER, JR AF JERVIS, TR LU, HL TESMER, JR TI EFFECT OF NITROGEN IMPLANTATION ON THE SURFACE HARDNESS OF PURE ALUMINUM AND ALLOY MATERIALS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID ION-IMPLANTATION; NITRIDE FILMS; BOMBARDMENT AB Samples of high purity annealed aluminum and 6061-T6 aluminum alloy were implanted with N+ ions at 200 keV at doses of 5, 10, 18, and 28 x 10(17) CM-2. Additionally a third sample was implanted with 15 x 10(17) CM-2 at 200 keV followed by an implant of 11 X 10(17) CM-2 at 100 keV. Implant profiles were analyzed using Rutherford backscattering (RBS). The surface hardness of these samples were measured using a nanoindenter. A substantial increase in surface hardness was observed in all the implanted samples. The thickness and peak hardness of the surface layer were enhanced by dual energy implantation. Beam heating during ion implantation resulted in annealing of the 6061-T6 samples. These effects were confirmed by annealing experiments which produced little change in overall hardness profiles. Large scale cracking of the hard surface layer was observed in low dose pure Al samples. This cracking behavior was altered by annealing, C1 LOS ALAMOS NATL LAB,DIV MEDIUM ENERGY PHYS,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545. RP JERVIS, TR (reprint author), LOS ALAMOS NATL LAB,CTR MAT SCI,MS A103,LOS ALAMOS,NM 87545, USA. NR 16 TC 15 Z9 15 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD OCT PY 1992 VL 72 IS 1 BP 59 EP 63 DI 10.1016/0168-583X(92)95282-V PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JX543 UT WOS:A1992JX54300011 ER PT J AU ZAMORA, PO MERCERSMITH, JA MAREK, MJ SCHULTE, LD RHODES, BA AF ZAMORA, PO MERCERSMITH, JA MAREK, MJ SCHULTE, LD RHODES, BA TI SIMILARITY OF COPPER AND TECHNETIUM BINDING-SITES IN HUMAN-IGG SO NUCLEAR MEDICINE AND BIOLOGY LA English DT Article ID MONOCLONAL-ANTIBODIES; TC-99M; PENICILLAMINE; FRAGMENTS; PROTEINS AB Kits for direct labeling of IgG with Tc-99m were used without modification for the preparation of [Cu-67]IgG. The IgG was pre-treated to generate thiolate groups which would bind Cu-67. The direct labeling of reduced IgG with Cu-67 was highly efficient, resulting in approx. 95% Cu-67 binding. Non-reduced IgG (negative control) had labeling efficiencies of less than 10%. IgG pre-exposed to Cu(II) had reduced amounts of Tc-99m bound to it. The results demonstrate a direct relationship between copper- and Tc-99m-binding sites in IgG. C1 LOS ALAMOS NATL LAB,MED RADIOISOTOPES RES PROGRAM,LOS ALAMOS,NM 87545. RP ZAMORA, PO (reprint author), RHOMED INC,4261 BALLOON PK RD NE,ALBUQUERQUE,NM 87109, USA. NR 33 TC 10 Z9 10 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0883-2897 J9 NUCL MED BIOL JI Nucl. Med. Biol. PD OCT PY 1992 VL 19 IS 7 BP 797 EP 802 PG 6 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA JH528 UT WOS:A1992JH52800013 ER PT J AU JENSEN, CL SKINNER, NL AF JENSEN, CL SKINNER, NL TI TECHNICAL NOTE - NUCLEAR REGULATORY COMMISSIONS EXAMINATION QUESTION BANK SYSTEM SO NUCLEAR SAFETY LA English DT Article AB The Nuclear Regulatory Commission is responsible for licensing reactor operators and senior reactor operators in the nuclear industry. Each year about 100 written examinations are given at different nuclear plant sites in support of this task. The examination process has several high-level requirements: (1) each examination must contain a specified scope of knowledge with predetermined sublevels in correct proportion to the total content, (2) records of examinations must be maintained, and (3) the examination process must be cost-effective. The Examination Question Bank System was designed and implemented to satisfy these requirements. RP JENSEN, CL (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0029-5604 J9 NUCL SAFETY JI Nucl. Saf. PD OCT-DEC PY 1992 VL 33 IS 4 BP 499 EP 506 PG 8 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA LL876 UT WOS:A1992LL87600001 ER PT J AU SNELGROVE, JL AF SNELGROVE, JL TI A REVIEW OF THE U3O8-AL REACTION AS A POTENTIAL HEAT-SOURCE IN RESEARCH AND TEST REACTOR ACCIDENTS SO NUCLEAR SAFETY LA English DT Article AB A critical review of the literature on the U3O8-Al reaction has been conducted. The reaction in fabricated fuel plates is found to be less energetic and much slower than that in cold-pressed powder mixtures. The difference is at least partially attributable to conversion of up to 50% of the U3O8 to U4O9 during fabrication. No definitive measurements of the amount and rate of energy release have been made. Data are provided upon which to base calculations of energy release. RP SNELGROVE, JL (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,BLDG 207,ARGONNE,IL 60439, USA. NR 24 TC 0 Z9 0 U1 0 U2 0 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0029-5604 J9 NUCL SAFETY JI Nucl. Saf. PD OCT-DEC PY 1992 VL 33 IS 4 BP 535 EP 542 PG 8 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA LL876 UT WOS:A1992LL87600004 ER PT J AU MUHLHEIM, MD SILVER, EG AF MUHLHEIM, MD SILVER, EG TI ACTIVITIES RELATED TO WASTE AND SPENT FUEL-MANAGEMENT SO NUCLEAR SAFETY LA English DT Article RP MUHLHEIM, MD (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0029-5604 J9 NUCL SAFETY JI Nucl. Saf. PD OCT-DEC PY 1992 VL 33 IS 4 BP 576 EP 585 PG 10 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA LL876 UT WOS:A1992LL87600007 ER PT J AU CROSS, AE AF CROSS, AE TI ANALYSIS OF CORRECTIVE ACTIONS APPLIED TO NUCLEAR-POWER-PLANT OPERATIONS SO NUCLEAR SAFETY LA English DT Article AB In May 1990 the Nuclear Operations Analysis Center at Oak Ridge National Laboratory completed an analysis of corrective action data from events at nuclear power plants during 1989. This study was conducted for the Nuclear Regulatory Commission's Office for Analysis and Evaluation of Operational Data. The results of the study indicated that procedure modification, equipment replacement/adjustment, and training were the three predominant types of corrective actions taken by the industry in 1989. Each of these three corrective action types was studied to characterize the actions taken by nuclear power-plant licensees to prevent recurrence of similar events. The study also illustrated that diagnostic information could be obtained by analyzing corrective action data provided in Licensee Event Reports from across the industry. This approach could result in improved plant performance through the reduction of undesired operational events. RP CROSS, AE (reprint author), OAK RIDGE NATL LAB,CTR NUCL OPERAT ANAL,POB 2009,OAK RIDGE,TN 37831, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0029-5604 J9 NUCL SAFETY JI Nucl. Saf. PD OCT-DEC PY 1992 VL 33 IS 4 BP 586 EP 592 PG 7 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA LL876 UT WOS:A1992LL87600008 ER PT J AU CLETCHER, JW AF CLETCHER, JW TI REACTOR SHUTDOWN EXPERIENCE SO NUCLEAR SAFETY LA English DT Article RP CLETCHER, JW (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0029-5604 J9 NUCL SAFETY JI Nucl. Saf. PD OCT-DEC PY 1992 VL 33 IS 4 BP 593 EP 595 PG 3 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA LL876 UT WOS:A1992LL87600009 ER PT J AU MUHLHEIM, MD SILVER, EG AF MUHLHEIM, MD SILVER, EG TI OPERATING UNITED-STATES POWER-REACTORS SO NUCLEAR SAFETY LA English DT Article RP MUHLHEIM, MD (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0029-5604 J9 NUCL SAFETY JI Nucl. Saf. PD OCT-DEC PY 1992 VL 33 IS 4 BP 596 EP 608 PG 13 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA LL876 UT WOS:A1992LL87600010 ER PT J AU MUHLHEIM, MD AF MUHLHEIM, MD TI WORLD NUCLEAR PERFORMANCE SO NUCLEAR SAFETY LA English DT Article RP MUHLHEIM, MD (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0029-5604 J9 NUCL SAFETY JI Nucl. Saf. PD OCT-DEC PY 1992 VL 33 IS 4 BP 614 EP 634 PG 21 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA LL876 UT WOS:A1992LL87600012 ER PT J AU QUEENER, DS AF QUEENER, DS TI REPORTS, STANDARDS, AND SAFETY GUIDES SO NUCLEAR SAFETY LA English DT Article RP QUEENER, DS (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0029-5604 J9 NUCL SAFETY JI Nucl. Saf. PD OCT-DEC PY 1992 VL 33 IS 4 BP 635 EP 642 PG 8 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA LL876 UT WOS:A1992LL87600013 ER PT J AU HUMENIK, K GROSS, KC AF HUMENIK, K GROSS, KC TI USING FOURIER-SERIES METHODS TO REDUCE CORRELATION OF NUCLEAR-POWER REACTOR DATA SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID PROBABILITY RATIO TEST; SURVEILLANCE AB Sequential probability ratio tests (SPRTs) are applied to the monitoring of nuclear power reactor signals. The theory of SPRTs applied to correlated data that have an unknown distribution is very incomplete. Unfortunately, a common problem regrading the application of sequential methods to reactor variables is that the variables are often contaminated with noise that is either non-Gaussian or serially correlated (or both). A Fourier series approximation can be used to remove much of the correlation in the data. This method is relatively simple to implement but has the desirable property of reducing correlation, thereby allowing the assumption of Gaussian, independent data to hold more readily. Delayed neutron signal data and reactor coolant pump data are analyzed. The theory has been validated by extensive testing with data from the Experimental Breeder Reactor II. The use of SPRT techniques as decision aids in two artificial intelligence-based expert systems for surveillance and diagnosis applications in nuclear reactors is also discussed. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP HUMENIK, K (reprint author), UNIV MARYLAND,CATONSVILLE,MD 21228, USA. NR 21 TC 2 Z9 2 U1 1 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD OCT PY 1992 VL 112 IS 2 BP 127 EP 135 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JR076 UT WOS:A1992JR07600003 ER PT J AU BOOTH, TE AF BOOTH, TE TI ANALYTIC MONTE-CARLO SCORE DISTRIBUTIONS FOR FUTURE STATISTICAL CONFIDENCE-INTERVAL STUDIES SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article AB The interpretation of the statistical error estimates produced by Monte Carlo transport codes is still somewhat of an art. Empirically, there are variance reduction techniques whose error estimates are almost always reliable, and there are variance reduction techniques whose error estimates are often unreliable. Unreliable error estimates usually result from inadequate large score sampling from the score distribution's tail. Statisticians believe that more accurate confidence interval statements are possible if the general nature of the score distribution can be characterized. The analytic score distribution for geometry splitting/Russian roulette applied to a simple Monte Carlo problem and the analytic score distribution for the exponential transform applied to the same Monte Carlo problem are provided. RP BOOTH, TE (reprint author), LOS ALAMOS NATL LAB,POB 1663,X-6,MS B226,LOS ALAMOS,NM 87545, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD OCT PY 1992 VL 112 IS 2 BP 159 EP 169 PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JR076 UT WOS:A1992JR07600005 ER PT J AU WARD, LW AF WARD, LW TI EVALUATION OF THE LOSS OF RESIDUAL HEAT REMOVAL SYSTEMS IN PRESSURIZED WATER-REACTORS WITH U-TUBE STEAM-GENERATORS SO NUCLEAR TECHNOLOGY LA English DT Article DE RESIDUAL HEAT REMOVAL SYSTEM; NONCONDENSABLE GASES; BORIC ACID PRECIPITATION AB Since the loss of vital alternating current power and the residual heat removal system (RHRS) during shut-down at vogtle Unit 1 on March 20, 1990, much attention has been focused on the need to evaluate system performance following such an event in a light water reactor. To evaluate system response following loss of the RHRS, a simplified, transient, nonequilibrium methodology was developed to provide early insights into the accident consequences and identify key phenomenological and system behavior in need of further, more detailed studies. During shutdown, with the reactor coolant system (RCS) at reduced pressure and temperature, inventory reductions are achieved through the introduction of nitrogen into the system. On removal of the manway entries, air can then enter the system. If the RHRS fails under such conditions, the steam generators may be able to be used as an alternate means of decay heat removal provided RCS integrity can be ensured. Moreover, once boiling initiates, RCS pressure increases because of the presence of noncondensable gases in the system. As a consequence, there is a need to assess the RCS pressure response since the success of this strategy depends on whether the peak pressure is sufficient to cause failure of any of the RCS temporary boundaries used during plant refueling outages. If there is insufficient time to close an open RCS and boiling initiates, a source of coolant makeup is needed to prevent core uncovery and fuel damage. Should boiling persist for several hours, an appreciable amount of boric acid accumulates in the reactor vessel. The subsequent restoration of the RHRS may result in the inadvertent precipitation of the boric acid in the RHRS lines, preventing its further use for decay heat removal. The methodology serves as an analytical tool to assess the RCS peak pressure when attempting to utilize the steam generators following a loss of the RHRS during shutdown and the consequences of borated water addition for long-term core cooling in the event the RCS is open to the containment. The analyses demonstrate that the steam generators could be used for heat removal from reduced inventory conditions at shut-down provided the RCS integrity can be ensured. If the RCS cannot be closed and loss of the RHRS results in boiling, the simple action of adding borated water to the RCS to prevent core uncovery poses a potential boric acid precipitation concern during the long term. The results of the evaluation in which the steam generators are used as an alternate means of decay heat removal are pertinent to pressurized water reactors utilizing U-tube steam generator designs. Further research is being conducted to assess behavior in plants utilizing once-through steam generators. Peak pressures are not expected to differ significantly from that for the U-tube design. C1 EG&G IDAHO INC,IDAHO NATL ENGN LAB,ROCKVILLE,MD 20852. NR 7 TC 4 Z9 4 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD OCT PY 1992 VL 100 IS 1 BP 25 EP 38 PG 14 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JN329 UT WOS:A1992JN32900003 ER PT J AU ALLEN, MD PILCH, MM GRIFFITH, RO NICHOLS, RT AF ALLEN, MD PILCH, MM GRIFFITH, RO NICHOLS, RT TI EXPERIMENTS TO INVESTIGATE THE EFFECT OF FLIGHT PATH ON DIRECT CONTAINMENT HEATING SO NUCLEAR TECHNOLOGY LA English DT Article DE DIRECT CONTAINMENT HEATING; HIGH-PRESSURE MELT EJECTION; SURTSEY TEST FACILITY AB The limited flight path experiments investigate the effect of reactor subcompartment flight path length on direct containment heating (DCH) in a severe reactor accident. The test series consists of eight experiments with nominal flight paths of 1, 2, or 8 m. A thermitically generated mixture of iron, chromium, and alumina simulates the corium melt of a severe accident in a light water reactor. After thermite ignition, super-heated steam forcibly ejects the molten debris into a 1:10 linear scale model of either the Surry or Zion reactor cavity. The blowdown steam entrains the molten debris and disperses it into a 103-m3 containment model. The vessel pressure, gas temperature, debris temperature, hydrogen produced by steam/metal reactions, debris velocity, mass dispersed into the Surtsey vessel, and debris particle size are measured for each experiment. The measured peak pressure for each experiment is normalized by the total amount of energy introduced into the Surtsey vessel and increases with lengthened flight path. The debris temperature at the cavity exit is almost-equal-to 2320 K. Gas grab samples indicate that steam in the cavity reacts rapidly to form hydrogen, so the driving gas is a mixture of steam and hydrogen. In these experiments, almost-equal-to 70% of the steam driving gas is converted to hydrogen. These experiments indicate that the bulk of DCH interactions occur below the subcompartment structure, not in the upper dome of Surtsey. The effect of deentrainment by reactor subcompartments may significantly reduce the peak containment load in a severe reactor accident. RP ALLEN, MD (reprint author), SANDIA NATL LABS,DEPT SEVERE ACCID PHENOMENOL,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD OCT PY 1992 VL 100 IS 1 BP 52 EP 69 PG 18 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JN329 UT WOS:A1992JN32900005 ER PT J AU SLOAN, SM HASSAN, Y AF SLOAN, SM HASSAN, Y TI A STUDY OF RELAP5/MOD2 AND RELAP5/MOD3 PREDICTIONS OF A SMALL-BREAK LOSS-OF-COOLANT ACCIDENT SIMULATION CONDUCTED AT THE ROSA-IV LARGE-SCALE TEST FACILITY SO NUCLEAR TECHNOLOGY LA English DT Article DE RELAP THERMALHYDRAULIC ANALYSIS; SMALL-BREAK LOSS-OF-COOLANT ACCIDENT; LARGE-SCALE-TEST FACILITY AB The thermal-hydraulics simulation codes RELAP5/MOD2 and RELAP5/MOD3 are utilized to calculate the phenomena that occurred during a small-break loss-of-coolant accident (LOCA) simulation conducted at the ROSA-IV Large-Scale Test Facility. The objectives of the work are to analyze RELAP5/MOD2 and RELAP5/MOD3 predictions of a small-break LOCA simulation and to compare the ability of each code version to accurately predict the important physical phenomena of the experiment. The RELAP5/MOD2 and RELAP5/MOD3 predictions are compared with each other and assessed against the experimental results. The overall conclusion is that both code versions predict trends well, but each differs in the prediction of the magnitude and timing of occurrences. Specific areas of difference include primary system pressure, differential pressure in the upper plenum, core liquid level depression and subsequent heatup, core void fraction profile, and the differential pressure in the steam generator inlet plenum. All but the last of these differences are related to the RELAP5/MOD3 prediction of excessive liquid holdup in the upper plenum during the first core liquid depression, which is believed to lead to the prediction of water trickling into the upper core volumes and providing a cooling mechanism not present during the experiment. The liquid holdup is believed to be the result of an overprediction of interphase drag at the junctions between the upper plenum volumes. The trends of increase and decrease in steam generator liquid inventory are more correctly calculated by RELAP5/MOD3 than RELAP5/MOD2 because of the implementation of a countercurrent flow limitation equation at the inlet to the steam generator U-tubes. Although the results of any single exercise are not sufficient to make a global assessment of code performance capabilities, this study identifies an area that should be investigated more fully in future code assessment exercises by utilizing experimental data from transients that will further exercise the interphase drag computation capability of the code. C1 IDAHO NATL ENGN LAB,IDAHO FALLS,ID. TEXAS A&M UNIV SYST,DEPT NUCL ENGN,COLL STN,TX 77843. RP SLOAN, SM (reprint author), EG&G IDAHO INC,POB 1625,IDAHO FALLS,ID 83415, USA. NR 11 TC 2 Z9 2 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD OCT PY 1992 VL 100 IS 1 BP 111 EP 124 PG 14 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JN329 UT WOS:A1992JN32900009 ER PT J AU MURRAY, PE AF MURRAY, PE TI A NUMERICAL PERFORMANCE STUDY OF THE PGCR METHOD APPLIED TO NUCLEAR-REACTOR HEAT-TRANSFER CALCULATIONS SO NUCLEAR TECHNOLOGY LA English DT Note DE ITERATIVE METHODS; CONJUGATE RESIDUAL METHOD; HEAT TRANSFER AB The numerical solution of heat transfer problems may involve substantial execution time, and much of the execution time may be spent in the matrix solver. Iterative solution methods may be more efficient than direct methods for solving a large matrix equation. although iterative methods have been applied to many fields of engineering simulation, they are not widely used in nuclear reactor simulation. Moreover, the selection of a suitable iterative method depends on the problem. Heat transfer in nuclear reactors is a complex process that includes solid conduction, fluid advection, radiation, and convection between solid and fluid. Thus, the feasibility of matrix iterative solution methods is investigated, and the numerical performance of a selected iterative method is assessed. The preconditioned generalized conjugate residual (PGCR) method is an iterative method used in the integrated systems code (ISC) to simulate heat transfer in a modular high-temperature gas-cooled reactor. The numerical performance of the PGCR method is assessed to determine the computational requirements of the ISC. A steady-state heat transfer problem that includes conduction, con vection, advection, and radiation heat transfer is solved in the performance study. The execution time of the PGCR method is obtained in the cases of four matrix sizes and three values of the heat transfer Biot number. The Biot number is varied to examine a complete range of convective heat transfer conditions. The execution time per equation is 0.22 to 0.55 ms on the Cray X-MP and 1.6 to 5.0 ms on the Dec 5000 workstation. These results show that the PGCR method is effective for nuclear reactor heat transfer calculations and provides an efficient and reliable computational performance. RP MURRAY, PE (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD OCT PY 1992 VL 100 IS 1 BP 135 EP 140 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JN329 UT WOS:A1992JN32900011 ER PT J AU HUSTON, P ESPENSON, JH BAKAC, A AF HUSTON, P ESPENSON, JH BAKAC, A TI BETA-HYDROGEN ABSTRACTION BY THIYL RADICALS SO ORGANOMETALLICS LA English DT Note ID TRANSITION-METAL COMPLEXES; PHOTOCHEMICAL GENERATION; AQUEOUS-SOLUTION; ALKYL RADICALS; CARBON BOND; CATION AB Alkanethiyl radicals, typified by C2H5S., react rapidly in aqueous solution with C2H5ML(H2O)2+, where ML = Co([14]aneN4), k = 1.15 X 10(8) L mol-1 s-1, and Cr([15]aneN4), k = 5.9 X 10(7) L mol-1 s-1. The use of C2D5ML(H2O)2+ leads to k(H)/k(D) = 2.6 (Co) and 3.3 (Cr), consistent with beta-hydrogen abstraction and formation of ethylene. The methylcobalt complex forms C2H5SCH3, with k = 2.4 X 10(7) L mol-1 s-1 and k(H)/k(D) is similar to 1. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 12 TC 11 Z9 11 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD OCT PY 1992 VL 11 IS 10 BP 3165 EP 3166 DI 10.1021/om00046a004 PG 2 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA JT754 UT WOS:A1992JT75400004 ER PT J AU CHOI, MG ANGELICI, RJ AF CHOI, MG ANGELICI, RJ TI THE BENZO[B]THIOPHENE (BT) COMPLEXES CP'(CO)2RE(BT) - MODELS FOR BT ADSORPTION ON HYDRODESULFURIZATION CATALYSTS SO ORGANOMETALLICS LA English DT Article ID SULFUR-COORDINATED THIOPHENE; COO-MOO3-AL2O3 CATALYST; DEUTERIUM-EXCHANGE; IRIDIUM COMPLEXES; CRYSTAL-STRUCTURE; IRON CARBONYLS; BENZOTHIOPHENE; DIBENZOTHIOPHENE; HYDROGENATION; REACTIVITY AB Benzo[b]thiophene (BT) coordinates in Cp(CO)2Re(BT) as an equilibrium mixture of eta1(S) and 2,3-eta2 isomers. When the electron density on the Re is increased by replacing Cp (eta5-C5H5) with Cp* (eta5-C5Me5), the amount of eta2 isomer increases. This shift in equilibrium can be readily explained by assuming that the sulfur in BT is an electron donor toward Re, while bonding of the C(2)-C(3) olefinic bond to Re involves an important component of pi back-bonding. The intramolecular nature of the isomerization between 1a and 1b was established by the observation that neither 2-MeBT nor PPh3 was incorporated into the [GRAPHICS] complexes during the time of isomerization. The observed isomerization and the novel (2,3-eta2)-BT coordination mode in 1a and 2a provide for the first time a basis for understanding the hydrogenation and initial steps in the hydrodesulfurization of BT on HDS catalysts. 2- and 3-Methylbenzo[b]thiophenes, 2-MeBT and 3-MeBT, are stronger sulfur-donor ligands than BT and therefore form only the eta1(S) isomer of the complexes Cp*(CO)2Re(MeBT). The reactions of Cp*(CO)2Re(BT) (1) with Me3O+ and W(CO)5(THF) give the sulfur adducts Cp*(CO)2Re((2,3-eta2)-BT.CH3)+ (5) and Cp*(CO)2Re(eta2:eta(S)-mu2-BT)W(CO)5 (6). An X-ray structural characterization of the eta1(S)-bound 3-MeBT complex CP*(CO)2Re(eta1(S)-3-MeBT) (4) is also reported. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 78 TC 51 Z9 51 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD OCT PY 1992 VL 11 IS 10 BP 3328 EP 3334 DI 10.1021/om00046a035 PG 7 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA JT754 UT WOS:A1992JT75400035 ER PT J AU KUBAS, GJ BURNS, CJ KHALSA, GRK VANDERSLUYS, LS KISS, G HOFF, CD AF KUBAS, GJ BURNS, CJ KHALSA, GRK VANDERSLUYS, LS KISS, G HOFF, CD TI DIHYDROGEN - A BETTER LIGAND THAN WATER - IR AND X-RAY EVIDENCE FOR AQUO COORDINATION IN W(CO)3(PR3)2(H2O), THERMODYNAMICS OF H2O VERSUS ETA(2)-H2 BINDING, AND H2O/D2 ISOTOPIC EXCHANGE - IMPLICATIONS ON THE BIOLOGICAL ACTIVATION OF HYDROGEN SO ORGANOMETALLICS LA English DT Article ID METALLOORGANIC LEWIS-ACIDS; R = ISOPROPYL; MOLECULAR-HYDROGEN; CRYSTAL-STRUCTURE; TRANSITION-METALS; H BOND; C-H; PHOTOACOUSTIC CALORIMETRY; ORGANOTITANIUM COMPLEX; REACTIVITY AB Reactions of water with M(CO)3(PR3)2 and M(CO)3(PR3)2(eta2-H-2) (M = Mo, W; R = Cy (cyclohexyl), i-Pr) have been studied in various organic solvents. The products contained reversibly bound H2O, and infrared studies showed nu(OH) modes at widely varying positions. IR of O-18-labeled complexes and H-1 NMR gave no evidence for hydride or hydroxide ligands, indicating that oxidative addition of water did not occur. NMR of the aquo complexes showed rapid exchange between free and coordinated water at 298 K. The aquo complex W(CO)3(P-i-Pr3)2(H2O).THF was isolated from THF and structurally characterized. A long W-O distance of 2.320 (5) angstrom was observed for the reversibly bound H2O ligand, which also undergoes hydrogen-bonding interactions with both lattice THF and a CO on an adjacent molecule. Water was found to instantaneously displace the dihydrogen ligand in W(CO)3(PR3)2(eta2-H-2) in THF solution to give aquo complexes, but in hexane H-2 remained bound under a H-2 atmosphere. Thermodynamic measurements of the equilibrium W(CO)3(PR3)2(H-2) + H2O half arrow right over half arrow left W(CO)3(PR3)2(H2O) + H-2 in THF showed that the DELTAH value for binding was 3-4 kcal/mol higher for H2O. However, a higher entropy change related to hydrogen-bonding interactions between H2O and solvent resulted in DELTAG favoring H-2 coordination at 25-degrees-C by 1-2 kcal/mol. Isotopic exchange of W(CO)3(P-i-Pr3)2(eta2-D2 with H2O under a D2 atmosphere took place in THF, giving W(CO)3(P-i-Pr3)2(D2O). Both the favored binding of H-2 versus H2O and the latter exchange are relevant to the function of H-2-activating enzymes such as hydrogenase. Crystal data for W(CO)3(P-i-Pr3)2)(H2O).THF: space group P2(1)/n, a = 13.554 (2) angstrom, b = 16.417 (5) angstrom, c = 15.059 (4) angstrom, beta = 116.24 (2)-degrees, Z = 4. C1 UNIV MIAMI,DEPT CHEM,CORAL GABLES,FL 33124. RP KUBAS, GJ (reprint author), LOS ALAMOS NATL LAB,INORGAN & STRUCT CHEM GRP INC1,LOS ALAMOS,NM 87545, USA. NR 99 TC 87 Z9 87 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD OCT PY 1992 VL 11 IS 10 BP 3390 EP 3404 DI 10.1021/om00046a044 PG 15 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA JT754 UT WOS:A1992JT75400044 ER PT J AU COURTRIGHT, EL KNOLL, RW STPIERRE, GR RAPP, RA AF COURTRIGHT, EL KNOLL, RW STPIERRE, GR RAPP, RA TI ELECTROLYTIC PROTECTION TO REDUCE HIGH-TEMPERATURE OXIDATION SO OXIDATION OF METALS LA English DT Article DE OXIDATION; ELECTRONS; ELECTROLYTE; IONIC CONDUCTION; ELECTRIC FIELD AB The imposition of a dc voltage across an oxide-ion-conducting solid electrolyte, upon which a gradient in the chemical potential of neutral oxygen (O, O2) is maintained, causes coupled gradients in the electrochemical potentials of oxygen ions and electrons. The concept of balancing these gradients to provide oxidation protection at high temperatures is discussed. Experimental results show a significant reduction in the oxidation of a zircaloy substrate under an applied electric field near the open-circuit potential. The current densities required are small enough to allow the use of electrically-conducting-ceramic electrodes. C1 OHIO STATE UNIV, DEPT MAT SCI & ENGN, COLUMBUS, OH 43210 USA. RP PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 17 TC 3 Z9 3 U1 0 U2 1 PU SPRINGER/PLENUM PUBLISHERS PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0030-770X EI 1573-4889 J9 OXID MET JI Oxid. Met. PD OCT PY 1992 VL 38 IS 3-4 BP 267 EP 287 DI 10.1007/BF00666915 PG 21 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA JW930 UT WOS:A1992JW93000006 ER PT J AU ASARO, RJ AHZI, S BLUMENTHAL, W DIGIOVANNI, A AF ASARO, RJ AHZI, S BLUMENTHAL, W DIGIOVANNI, A TI MECHANICAL PROCESSING OF HIGH J(C) BSCCO SUPERCONDUCTORS SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID PLASTIC-DEFORMATION; POLYCRYSTALS; CRYSTALS; MICROMECHANICS AB High J(c) superconducting oxides can be obtained by processing polycrystalline powders to achieve high degrees of densification and sharp crystallographic textures characterized by the conducting crystallographic planes lying parallel to the direction of the current flow (i.e., in the plane of a conducting tape or parallel to the axis of a wire). In the present study, we investigate the densification and texture evolution in a Pb doped Bi-Sr-Ca-Cu oxide (BSCCO) under axisymmetric and plane strain (channel die) compression. Experimental measurements of the microstructural evolution, including crystallographic texture and grain morphology, are presented as a function of the degree of deformation and densification. The orientations of the conducting planes (c planes) are shown by measured X-ray pole figures and analyses of these orientations are given for both tests. A model based on crystal plasticity theory is proposed to simulate the inelastic deformation and texturing of the BSCCO oxide. Predicted textures, under both axisymmetric and plane strain compression, agree well with the experimental observations. Analysis of the predicted orientation distribution of the c planes with respect to the loading direction suggests that the most desirable texture for a high overall critical current density can be obtained by axisymmetric compression, but textures that should lead to high J(c)'s are also obtained through plane strain compression. C1 LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. RP ASARO, RJ (reprint author), UNIV CALIF SAN DIEGO,DEPT APPL MECH & ENGN SCI,LA JOLLA,CA 92093, USA. NR 18 TC 21 Z9 22 U1 2 U2 7 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD OCT PY 1992 VL 66 IS 4 BP 517 EP 538 PG 22 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA JR673 UT WOS:A1992JR67300003 ER PT J AU PAREJA, R DELACRUZ, RM GONZALEZ, R CHEN, Y AF PAREJA, R DELACRUZ, RM GONZALEZ, R CHEN, Y TI POSITRON-ANNIHILATION SPECTROSCOPY OF VACANCY AGGREGATES IN NEUTRON-IRRADIATED MGO CRYSTALS SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID ALKALINE-EARTH OXIDES; SINGLE-CRYSTALS; HYDROXYL; HYDROGEN; GROWTH AB Positron annihilation measurements in neutron-irradiated MgO crystals show that the positron lifetime is shorter than in as-grown crystals, suggesting that most of the defects produced by neutron irradiations are positively charged. The concentration of the neutral anion vacancy (possibly also the neutral anion divacancy) is estimated to be no more than approximately 10(16) cm-3 for samples irradiated to a dose of 10(17) to 10(19) n cm-2. Annealing experiments on the neutron-irradiated crystals show a significant increase in the positron lifetime after anneals at 900 K. The increase is attributed to positron trapping by anion-vacancy aggregates. A lifetime of (284 +/- 15) ps is tentatively assigned to positrons trapped in these aggregates. C1 UNIV COMPLUTENSE MADRID,FAC CIENCIAS FIS,DEPT FIS MAT,E-28049 MADRID,SPAIN. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. US DOE,DIV MAT SCI,WASHINGTON,DC 20585. RP PAREJA, R (reprint author), UNIV CARLOS III,ESCUELA POLITECN SUPER,E-28913 LEGANES,SPAIN. NR 28 TC 1 Z9 1 U1 0 U2 3 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD OCT PY 1992 VL 66 IS 4 BP 597 EP 607 PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA JR673 UT WOS:A1992JR67300008 ER PT J AU YACHANDRA, VK DEROSE, VJ LATIMER, MJ MUKERJI, I LIANG, WC SAUER, K KLEIN, MP AF YACHANDRA, VK DEROSE, VJ LATIMER, MJ MUKERJI, I LIANG, WC SAUER, K KLEIN, MP TI A STRUCTURAL MODEL FOR THE PHOTOSYNTHETIC OXYGEN EVOLVING MANGANESE COMPLEX SO PHOTOSYNTHESIS RESEARCH LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD OCT PY 1992 VL 34 IS 1 BP 88 EP 88 PG 1 WC Plant Sciences SC Plant Sciences GA JV848 UT WOS:A1992JV84800033 ER PT J AU WASIELEWSKI, MR GAINES, GL NIEMCZYK, MP GOSZTOLA, D SVEC, WA AF WASIELEWSKI, MR GAINES, GL NIEMCZYK, MP GOSZTOLA, D SVEC, WA TI SUPRAMOLECULAR STRUCTURES FOR MODELING PHOTOSYNTHETIC REACTION CENTER FUNCTION SO PHOTOSYNTHESIS RESEARCH LA English DT Meeting Abstract C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RI Gosztola, David/D-9320-2011 OI Gosztola, David/0000-0003-2674-1379 NR 0 TC 0 Z9 0 U1 0 U2 3 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD OCT PY 1992 VL 34 IS 1 BP 91 EP 91 PG 1 WC Plant Sciences SC Plant Sciences GA JV848 UT WOS:A1992JV84800044 ER PT J AU FALKOWSKI, PG AF FALKOWSKI, PG TI PHYTOPLANKTON PHOTOSYNTHESIS IN THE OCEAN IN RELATION TO THE GLOBAL CARBON-CYCLE SO PHOTOSYNTHESIS RESEARCH LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,DIV OCEANOG & ATMOSPHER SCI,UPTON,NY 11973. NR 0 TC 1 Z9 1 U1 1 U2 3 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD OCT PY 1992 VL 34 IS 1 BP 108 EP 108 PG 1 WC Plant Sciences SC Plant Sciences GA JV848 UT WOS:A1992JV84800110 ER PT J AU LONG, SP NIE, GY BAKER, NR DRAKE, BG FARAGE, PK HENDREY, G LEWIN, KH AF LONG, SP NIE, GY BAKER, NR DRAKE, BG FARAGE, PK HENDREY, G LEWIN, KH TI THE IMPLICATIONS OF CONCURRENT INCREASES IN TEMPERATURE, CO2 AND TROPOSPHERIC O-3 FOR TERRESTRIAL C-3 PHOTOSYNTHESIS SO PHOTOSYNTHESIS RESEARCH LA English DT Meeting Abstract C1 SMITHSONIAN ENV RES CTR,EDGEWATER,MD 21037. UNIV ESSEX,DEPT BIOL,COLCHESTER CO4 3SQ,ESSEX,ENGLAND. BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11975. RI Long, Stephen/A-2488-2008 OI Long, Stephen/0000-0002-8501-7164 NR 0 TC 5 Z9 5 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD OCT PY 1992 VL 34 IS 1 BP 108 EP 108 PG 1 WC Plant Sciences SC Plant Sciences GA JV848 UT WOS:A1992JV84800111 ER PT J AU DAU, H SAUER, K AF DAU, H SAUER, K TI ELECTRIC-FIELD EFFECT ON THE PICOSECOND FLUORESCENCE OF PHOTOSYSTEM-II AND ITS RELATION TO THE ENERGETICS AND KINETICS OF PRIMARY CHARGE SEPARATION SO PHOTOSYNTHESIS RESEARCH LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD OCT PY 1992 VL 34 IS 1 BP 119 EP 119 PG 1 WC Plant Sciences SC Plant Sciences GA JV848 UT WOS:A1992JV84800174 ER PT J AU KWA, SLS VANAMERONGEN, H LIN, S DEKKER, JP VANGRONDELLE, R STRUVE, WS AF KWA, SLS VANAMERONGEN, H LIN, S DEKKER, JP VANGRONDELLE, R STRUVE, WS TI ULTRAFAST ENERGY-TRANSFER IN LHC-II TRIMERS FROM THE CHL A/B LIGHT-HARVESTING ANTENNA OF PHOTOSYSTEM-II SO PHOTOSYNTHESIS RESEARCH LA English DT Meeting Abstract C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. FREE UNIV AMSTERDAM,DEPT PHYS & ASTRON,1081 HV AMSTERDAM,NETHERLANDS. NR 0 TC 0 Z9 0 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD OCT PY 1992 VL 34 IS 1 BP 119 EP 119 PG 1 WC Plant Sciences SC Plant Sciences GA JV848 UT WOS:A1992JV84800171 ER PT J AU OLSON, JM MILLER, M SUTHERLAND, JC AF OLSON, JM MILLER, M SUTHERLAND, JC TI CIRCULAR-DICHROISM OF REACTION CENTERS FROM CHLOROBIUM-TEPIDUM SO PHOTOSYNTHESIS RESEARCH LA English DT Meeting Abstract C1 ODENSE UNIV,INST BIOCHEM,DK-5230 ODENSE,DENMARK. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD OCT PY 1992 VL 34 IS 1 BP 123 EP 123 PG 1 WC Plant Sciences SC Plant Sciences GA JV848 UT WOS:A1992JV84800198 ER PT J AU WARREN, PV SMART, LB MCINTOSH, L GOLBECK, JH AF WARREN, PV SMART, LB MCINTOSH, L GOLBECK, JH TI ANALYSIS OF 6 INVIVO SITE-DIRECTED MUTANTS OF PSAB IN PHOTOSYSTEM-I TARGETING ASSEMBLY OF THE PROPOSED LEUCINE ZIPPER AND ONE OF THE CYSTEINE LIGANDS TO IRON SULFUR CENTER FX SO PHOTOSYNTHESIS RESEARCH LA English DT Meeting Abstract C1 UNIV NEBRASKA,DEPT BIOCHEM,LINCOLN,NE 68583. MICHIGAN STATE UNIV,DOE PLANT RES LAB,E LANSING,MI 48824. NR 0 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD OCT PY 1992 VL 34 IS 1 BP 131 EP 131 PG 1 WC Plant Sciences SC Plant Sciences GA JV848 UT WOS:A1992JV84800236 ER PT J AU SEIBERT, M TOON, S GOVINDJEE ONEIL, MP WASIELEWSKI, MR AF SEIBERT, M TOON, S GOVINDJEE ONEIL, MP WASIELEWSKI, MR TI PRIMARY CHARGE SEPARATION IN ISOLATED PHOTOSYSTEM-II REACTION CENTERS SO PHOTOSYNTHESIS RESEARCH LA English DT Meeting Abstract C1 NREL,GOLDEN,CO 80401. UNIV ILLINOIS,URBANA,IL 61801. ARGONNE NATL LAB,ARGONNE,IL 60439. NR 0 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD OCT PY 1992 VL 34 IS 1 BP 135 EP 135 PG 1 WC Plant Sciences SC Plant Sciences GA JV848 UT WOS:A1992JV84800259 ER PT J AU BURGHAUS, O DEROSE, VJ KLEIN, MP AF BURGHAUS, O DEROSE, VJ KLEIN, MP TI THE SPIN HAMILTONIAN PARAMETERS OF EXCHANGE COUPLED MN (III,IV) DIMERS - MODELS FOR THE PHOTOSYNTHETIC OXYGEN EVOLVING MN CLUSTER SO PHOTOSYNTHESIS RESEARCH LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD OCT PY 1992 VL 34 IS 1 BP 138 EP 138 PG 1 WC Plant Sciences SC Plant Sciences GA JV848 UT WOS:A1992JV84800275 ER PT J AU WYDRZYNSKI, T HILLIER, W SEIBERT, M AF WYDRZYNSKI, T HILLIER, W SEIBERT, M TI ISOLATION OF PHOTOSYSTEM-II PROTEIN-COMPONENTS IN A NONAQUEOUS MEDIUM SO PHOTOSYNTHESIS RESEARCH LA English DT Meeting Abstract C1 AUSTRALIAN NATL UNIV,RES SCH BIOL SCI,CANBERRA,ACT 2601,AUSTRALIA. NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RI Wydrzynski, Thomas/C-9630-2009 NR 0 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD OCT PY 1992 VL 34 IS 1 BP 141 EP 141 PG 1 WC Plant Sciences SC Plant Sciences GA JV848 UT WOS:A1992JV84800291 ER PT J AU GHIRARDI, ML SEIBERT, M AF GHIRARDI, ML SEIBERT, M TI ELECTRON DONATION TO PHOTOSYSTEM-II BY MANGANESE AND DIPHENYLCARBAZIDE - KINETIC-PARAMETERS SO PHOTOSYNTHESIS RESEARCH LA English DT Meeting Abstract C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. NR 0 TC 0 Z9 0 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD OCT PY 1992 VL 34 IS 1 BP 147 EP 147 PG 1 WC Plant Sciences SC Plant Sciences GA JV848 UT WOS:A1992JV84800325 ER PT J AU IBA, K GIBSON, S ARONDEL, V NISHIUCHI, T FUSE, T NISHIMURA, M SOMERVILLE, CR AF IBA, K GIBSON, S ARONDEL, V NISHIUCHI, T FUSE, T NISHIMURA, M SOMERVILLE, CR TI ISOLATION OF THE ARABIDOPSIS FADD GENE BY CHROMOSOME WALKING SO PHOTOSYNTHESIS RESEARCH LA English DT Meeting Abstract C1 KYUSHU UNIV,FAC SCI,DEPT BIOL,FUKUOKA 812,JAPAN. MICHIGAN STATE UNIV,US DEPT ENERGY,PLANT RES LAB,E LANSING,MI 48824. NR 0 TC 1 Z9 1 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD OCT PY 1992 VL 34 IS 1 BP 169 EP 169 PG 1 WC Plant Sciences SC Plant Sciences GA JV848 UT WOS:A1992JV84800443 ER PT J AU LAROCHE, J WYMAN, K FALKOWSKI, P AF LAROCHE, J WYMAN, K FALKOWSKI, P TI MOLECULAR-BIOLOGY OF LIGHT ACCLIMATION IN THE CHLOROPHYTE DUNALIELLA-TERTIOLECTA SO PHOTOSYNTHESIS RESEARCH LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RI LaRoche, Julie/A-1109-2010 NR 0 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD OCT PY 1992 VL 34 IS 1 BP 222 EP 222 PG 1 WC Plant Sciences SC Plant Sciences GA JV848 UT WOS:A1992JV84800668 ER PT J AU BALACHANDRAN, S DALEY, P OSMOND, B AF BALACHANDRAN, S DALEY, P OSMOND, B TI IMAGING PHOTOINHIBITION FOLLOWING INFECTION WITH TOBACCO MOSAIC-VIRUS (STRAIN PV230) SO PHOTOSYNTHESIS RESEARCH LA English DT Meeting Abstract C1 AUSTRALIAN NATL UNIV,RES SCH BIOL SCI,CANBERRA,ACT 2601,AUSTRALIA. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 0 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD OCT PY 1992 VL 34 IS 1 BP 237 EP 237 PG 1 WC Plant Sciences SC Plant Sciences GA JV848 UT WOS:A1992JV84800748 ER PT J AU MCCARTY, KF SCHIRBER, JE BOEHME, DR RADOUSKY, HB LIU, JZ SHELTON, RN AF MCCARTY, KF SCHIRBER, JE BOEHME, DR RADOUSKY, HB LIU, JZ SHELTON, RN TI DEPENDENCE OF THE EXCITATION WAVELENGTH ON THE RAMAN-ACTIVE PHONONS OF YBA2CU3O7 - SEARCH FOR LANDAU DAMPING IN SINGLE-DOMAIN CRYSTALS SO PHYSICA C LA English DT Article ID SUPERCONDUCTING GAP; OXYGEN STOICHIOMETRY; TEMPERATURE; SCATTERING; ENERGIES; GOLD AB In single-domain crystals of YBa2Cu3O7, we examine the dependence of phonon linewidth on wavevector by varying the wavelength of the exciting laser. In three crystals, we find the linewidths of the Raman-active phonons at 120 and 150 cm-1 to be nearly invariant for excitation wavelengths between 647 and 413 nm. That is, we find no broadening of the phonon linewidths with increasing phonon wavevector (decreasing excitation wavelength), and thus no evidence of Landau damping in our crystals. In addition, the correlation between the intensity of the chain-related Raman feature at approximately 232 cm-1 and the temperature dependence of the B1g-like phonon at 340 cm-1 has been investigated. In all three crystals, we find a net sharpening of the 340 cm-1 phonon below T(c) and essentially no intensity for the approximately 232 cm-1 mode under resonance conditions. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP MCCARTY, KF (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. RI McCarty, Kevin/F-9368-2012 OI McCarty, Kevin/0000-0002-8601-079X NR 27 TC 7 Z9 7 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD OCT 1 PY 1992 VL 200 IS 3-4 BP 315 EP 322 DI 10.1016/0921-4534(92)90383-N PG 8 WC Physics, Applied SC Physics GA JQ607 UT WOS:A1992JQ60700012 ER PT J AU NAZIRIPOUR, A DUAN, HM TELLO, R TIGGES, CP GINLEY, DS BHATTACHARYA, R BLAUGHER, R HERMANN, AM AF NAZIRIPOUR, A DUAN, HM TELLO, R TIGGES, CP GINLEY, DS BHATTACHARYA, R BLAUGHER, R HERMANN, AM TI SYNTHESIS OF TL-BA-CA-CU-O SUPERCONDUCTING THIN-FILMS BY SEQUENTIAL EVAPORATION AND ANNEALING IN THE ABSENCE OF AN ADDITIONAL THALLIUM SOURCE SO PHYSICA C LA English DT Article AB Although Tl-based superconductors show higher critical temperatures than other compounds, they suffer some disadvantages, such as surface roughness, non-uniform chemical composition, and the need for excess Tl from a separate source during post-deposition annealing. This paper reports a post-deposition annealing process (in the absence of a separate Tl source) of sequentially deposited metallic layers of Tl: Ba: Ca: Cu with excess amount of thallium in the multilayer. The films show uniform chemical composition and smooth surfaces. Critical temperatures as high as 101 K and critical current densities as high as 1.5 X 10(4) A/cm2 at 77 K in zero magnetic field have been achieved. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP NAZIRIPOUR, A (reprint author), UNIV COLORADO,DEPT PHYS,CAMPUS BOX 390,BOULDER,CO 80309, USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD OCT 1 PY 1992 VL 200 IS 3-4 BP 334 EP 336 DI 10.1016/0921-4534(92)90385-P PG 3 WC Physics, Applied SC Physics GA JQ607 UT WOS:A1992JQ60700014 ER PT J AU YOUNG, RT YOUNG, KH MULLER, MD OVSHINSKY, SR BUDAI, JD WHITE, CW MARTENS, JS AF YOUNG, RT YOUNG, KH MULLER, MD OVSHINSKY, SR BUDAI, JD WHITE, CW MARTENS, JS TI HIGH-QUALITY EPITAXIAL YBCO (F) FILMS DIRECTLY DEPOSITED ON SAPPHIRE SO PHYSICA C LA English DT Article ID YBA2CU3O7 THIN-FILMS; SURFACE-RESISTANCE AB High-quality epitaxial YBa2Cu3O7-delta(F) films were grown directly on r-plane (1102BAR) sapphire by a pulsed laser deposition technique using a multiphase fluorinated target. X-ray diffraction data showed that the film is highly c-axis oriented and in-plane aligned. The c-axis and in-plane mosaic spread are 1.1-degrees and 2.4-degrees, respectively. The microwave surface resistance measured by a con-focal resonator configuration is 56 mOMEGA at 94.1 GHz at 77 K which is the best reported value for a YBCO film on sapphire. The improved film quality is attributed to the fluorine which is transported from the target to the growing surface of the film where it acts as an etching and/or catalytic agent to preferentially remove defects and second phase impurities and to promote better in-plane epitaxy. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP YOUNG, RT (reprint author), ENERGY CONVERS DEVICES INC,1675 W MAPLE RD,TROY,MI 48084, USA. RI Budai, John/R-9276-2016 OI Budai, John/0000-0002-7444-1306 NR 10 TC 2 Z9 2 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD OCT 1 PY 1992 VL 200 IS 3-4 BP 437 EP 441 DI 10.1016/0921-4534(92)90399-W PG 5 WC Physics, Applied SC Physics GA JQ607 UT WOS:A1992JQ60700028 ER PT J AU DATZ, S LARSSON, M AF DATZ, S LARSSON, M TI RADIATIVE LIFETIMES FOR ALL VIBRATIONAL LEVELS IN THE X1-SIGMA+ STATE OF HEH+ AND ITS RELEVANCE TO DISSOCIATIVE RECOMBINATION EXPERIMENTS IN ION STORAGE-RINGS SO PHYSICA SCRIPTA LA English DT Article ID MOLECULAR ION; ENERGY; PREDISSOCIATION; TRANSITIONS; SPECTRUM; BAND AB This paper addresses the question whether ion storage rings advantageously could be used for studies of dissociative recombination of molecular ions. We have used a particular ion, HeH+, and a particular storage ring, CRYRING, in a case study. Vibrational relaxation times in ground state HeH+ have been calculated by means of an electric dipole moment function obtained from multi-reference CI wave functions. Parameters for CRYRING, including its electron cooler section, have been used to estimate storage times for HeH+, and expected count rates in a dissociative recombination experiment. It is shown that the expected storage time of HeH+ is two,orders of magnitude larger than the vibrational lifetimes, hence experiments with vibrationally cooled ions can be anticipated. The expected count rate is such that three orders of magnitude less ions than normally used in CRYRING (10(9)) is sufficient. C1 MANNE SIEGBAHN INST,S-10405 STOCKHOLM,SWEDEN. KONIGLIGA TH,DEPT PHYS,S-10044 STOCKHOLM,SWEDEN. RP DATZ, S (reprint author), OAK RIDGE NATL LAB,DIV PHYS,POB 2008,OAK RIDGE,TN 37831, USA. NR 36 TC 28 Z9 28 U1 0 U2 4 PU ROYAL SWEDISH ACAD SCIENCES PI STOCKHOLM PA PUBL DEPT BOX 50005, S-104 05 STOCKHOLM, SWEDEN SN 0281-1847 J9 PHYS SCRIPTA JI Phys. Scr. PD OCT PY 1992 VL 46 IS 4 BP 343 EP 347 DI 10.1088/0031-8949/46/4/005 PG 5 WC Physics, Multidisciplinary SC Physics GA JM844 UT WOS:A1992JM84400005 ER PT J AU SCOFIELD, JH MACGOWAN, BJ AF SCOFIELD, JH MACGOWAN, BJ TI ENERGIES OF NICKEL-LIKE 4D TO 4P LASER LINES SO PHYSICA SCRIPTA LA English DT Article ID X-RAY AMPLIFICATION; TRANSITIONS; IONS AB Relativistic multi-configuration Hartree-Fock calculations have been carried out for the energies of the nickel-like 4d to 4p X-ray lines which are potential lasing lines, Measurements of a set of these transition energies have also been made. Predicted wavelengths, covering the range of atomic numbers from Z = 46-92, have been derived by adjusting the ab initio energies by experimentally derived empirical constants. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94551 USA. RP SCOFIELD, JH (reprint author), LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94551 USA. NR 19 TC 43 Z9 43 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0031-8949 EI 1402-4896 J9 PHYS SCRIPTA JI Phys. Scr. PD OCT PY 1992 VL 46 IS 4 BP 361 EP 364 DI 10.1088/0031-8949/46/4/009 PG 4 WC Physics, Multidisciplinary SC Physics GA JM844 UT WOS:A1992JM84400009 ER PT J AU WANG, LZ DUCAN, RV AF WANG, LZ DUCAN, RV TI PROPOSED DIFFERENTIAL-FREQUENCY-READOUT SYSTEM BY HYSTERETIC JOSEPHSON-JUNCTIONS SO PHYSICAL REVIEW A LA English DT Article ID CORRELATED SPONTANEOUS-EMISSION; TUNNEL-JUNCTIONS; PHASE LOCK; NOISE; CHAOS; STABILITY; STEPS AB The Josephson relation V = nh nu/2e has been verified experimentally to 3 parts in 10(19) [A. K. Jain, J. E. Lukens, and J.-S. Tsai, Phys. Rev. Lett. 58, 1165 (1987)]. Motivated by this result, we propose a differential-frequency-readout system by two sets of hysteretic Josephson junctions rf biased at millimeter wavelengths. Because of the Josephson relation, the proposed differential-frequency-readout system is not limited by photon fluctuation, which limits most photon-detection schemes. In the context of the Stewart-McCumber model [W. C. Stewart, Appl. Phys. Lett. 12, 277 (1968); D. E. McCumber, J. Appl. Phys. 39, 3113 (1968)] of Josephson junctions, we show theoretically that the differential frequency of the two milliwave biases can be read out by the proposed system to unprecedented accuracy. The stability of the readout scheme is also discussed. The measurement uncertainty of the readout system resulting from the intrinsic thermal noise in the hysteretic junctions is shown to be insignificant. The study of two single junctions can be extended to two sets of Josephson junctions connected in series (series array) in this measurement scheme provided that junctions are separated by at least 10 mum [D. W. Jillie, J. E. Lukens, and Y. H. Kao, Phys. Rev. Lett. 38, 915 (1977)]. The sensitivity for the differential frequency detection may be increased by biasing both series arrays to a higher constant-voltage step. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP WANG, LZ (reprint author), UNIV NEW MEXICO,DEPT PHYS & ASTRON,ALBUQUERQUE,NM 87131, USA. NR 35 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD OCT 1 PY 1992 VL 46 IS 7 BP 3617 EP 3625 DI 10.1103/PhysRevA.46.3617 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JV109 UT WOS:A1992JV10900010 ER PT J AU BLUNDELL, SA AF BLUNDELL, SA TI ACCURATE SCREENED QED CALCULATIONS IN HIGH-Z MANY-ELECTRON IONS SO PHYSICAL REVIEW A LA English DT Article ID PERTURBATION-THEORY CALCULATIONS; LITHIUM-LIKE URANIUM; LAMB SHIFT; ISOELECTRONIC SEQUENCE; ENERGY-LEVELS; NA-LIKE; NUCLEAR-POLARIZATION; TRANSITION ENERGIES; SELF-ENERGY; HEAVY-ATOMS AB We describe a practical, rigorous, QED procedure for performing accurate calculations of the screened self-energy for high-Z ions based on a realistic local atomic potential. Using a basis-set algorithm, we show that the procedure involves a rapidly convergent partial-wave expansion that, in contrast to previous methods, requires explicit computation of only the first few partial waves. We apply the method to the 2s-2p1/2 transition of Li-like U, the 3s-3P3/2 transition of Na-like Pt, and the 4s-4p1/2 transition in Cu-like Bi. When combined with calculations of the screened Uehling vacuum-polarization term and earlier correlation calculations, the results agree with experiment to within several tenths of an eV. RP BLUNDELL, SA (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 46 TC 120 Z9 120 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD OCT 1 PY 1992 VL 46 IS 7 BP 3762 EP 3775 DI 10.1103/PhysRevA.46.3762 PG 14 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JV109 UT WOS:A1992JV10900028 ER PT J AU BEIERSDORFER, P PHILLIPS, TW WONG, KL MARRS, RE VOGEL, DA AF BEIERSDORFER, P PHILLIPS, TW WONG, KL MARRS, RE VOGEL, DA TI MEASUREMENT OF LEVEL-SPECIFIC DIELECTRONIC-RECOMBINATION CROSS-SECTIONS OF HELIUM-LIKE FE-XXV SO PHYSICAL REVIEW A LA English DT Article ID HIGHLY-CHARGED IONS; X-RAY-SPECTRA; ELECTRON-IMPACT EXCITATION; INNER-SHELL TRANSITIONS; SATELLITE SPECTRA; HE-LIKE; RADIATIVE RECOMBINATION; SOLAR-FLARES; STORAGE RING; OXYGEN IONS AB The strengths of individual 1s2l2l' resonances for dielectronic recombination of heliumlike iron are measured on an electron-beam ion trap using high-resolution x-ray spectroscopy. An energy resolution DELTAE/E of better than 0.1% is achieved by monitoring the exit channel of the recombination process. Dielectronic-resonance strengths are measured relative to the cross section for nonresonant radiative electron capture of heliumlike Fe XXV, and an overall uncertainty of 20% is achieved. Good agreement with theory is found for the strongest resonances; however, less good agreement is found for the weaker resonances. The results indicate that further theoretical and experimental efforts are necessary to reliably use weak dielectronic satellite lines in plasma diagnostics. RP BEIERSDORFER, P (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV HIGH TEMP PHYS,LIVERMORE,CA 94550, USA. NR 43 TC 120 Z9 125 U1 0 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD OCT 1 PY 1992 VL 46 IS 7 BP 3812 EP 3820 DI 10.1103/PhysRevA.46.3812 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JV109 UT WOS:A1992JV10900032 ER PT J AU ROTTMANN, LM BRUCH, R NEILL, P DREXLER, C DUBOIS, RD TOBUREN, LH AF ROTTMANN, LM BRUCH, R NEILL, P DREXLER, C DUBOIS, RD TOBUREN, LH TI SINGLE-ELECTRON CAPTURE BY 100-1500-KEV C+ IONS IN SEVERAL ATOMIC AND MOLECULAR TARGETS SO PHYSICAL REVIEW A LA English DT Article ID GROUND-STATE C+,N+; CHARGE-TRANSFER; COLLISIONS; H-2; O+; H-2-MOLECULES; CARBON; N-2 AB Experimentally determined single-electron-capture cross sections are presented for 100-1500-keV C+ impact on He, Ne, Ar, H-2, N2, O2, CO, NH3, CH4, C2H6, and (CH3)2 NH gaseous targets. For the atomic targets, the single-capture cross sections were found to merge as the impact energy increased. For the molecular targets, the relative changes in the cross sections exhibit little or no dependence on the impact energy. For these systems and in the energy range considered here, the single-electron-capture cross sections were found to scale remarkably well with the "size" of the molecular target, namely with the square of the bond length for the diatomic targets and with the number of atoms comprising the polyatomic targets. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP ROTTMANN, LM (reprint author), UNIV NEVADA, DEPT PHYS, RENO, NV 89557 USA. NR 19 TC 9 Z9 9 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD OCT 1 PY 1992 VL 46 IS 7 BP 3883 EP 3888 DI 10.1103/PhysRevA.46.3883 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JV109 UT WOS:A1992JV10900041 ER PT J AU DUTTA, CM LANE, NF KIMURA, M AF DUTTA, CM LANE, NF KIMURA, M TI THEORETICAL-STUDY OF NONRESONANT H-3(+)+HE-4-REVERSIBLE-ARROW-HE-3+H-4(+) CHARGE-TRANSFER IN THE THRESHOLD REGION SO PHYSICAL REVIEW A LA English DT Article ID SCATTERING; COLLISIONS; MOLECULES; ATOMS AB A quantum-mechanical calculation of charge-transfer cross sections for the forward (endothermic) and backward (exothermic) collision processes He-3+ + He-4 reversible He-3 + He-4+ in the threshold energy region has been carried out by using a two-state close-coupling treatment where the charge-transfer energy defect, approximately 1.3 meV, is the isotopic term difference between the He-3 and He-4 binding energies. The cross sections show numerous shape and orbiting resonances, which can be labeled with predissociation rotational and vibrational quantum numbers. From these cross sections, the forward and backward rate coefficients have been calculated. The present results, particularly the ratio of forward and backward rate coefficients, agree well with measurements of Schauer, Jefferts, and Dunn [Phys. Rev. A 42, 5332 (1990)]. C1 RICE UNIV,RICE QUANTUM INST,HOUSTON,TX 77251. ARGONNE NATL LAB,ARGONNE,IL 60439. RP DUTTA, CM (reprint author), RICE UNIV,DEPT PHYS,HOUSTON,TX 77251, USA. NR 12 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD OCT 1 PY 1992 VL 46 IS 7 BP 3889 EP 3892 DI 10.1103/PhysRevA.46.3889 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JV109 UT WOS:A1992JV10900042 ER PT J AU DELLWO, J LIU, Y TANG, CY PEGG, DJ ALTON, GD AF DELLWO, J LIU, Y TANG, CY PEGG, DJ ALTON, GD TI PHOTODETACHMENT CROSS-SECTIONS FOR LI- SO PHYSICAL REVIEW A LA English DT Article ID NEGATIVE-IONS; THRESHOLD AB Cross sections and asymmetry parameters associated with the process of photodetaching an electron from the Li- ion via the process hnu + Li- --> Li(2 2S) + e-(epsilonp) have been measured at several photon energies including the region in the vicinity of the opening of the channel: hnu+Li- --> Li(2 2P) + e-(epsilons). Strong coupling between these channels produces anomalous behavior in the 2Sepsilonp channel cross section. The measured cross sections are slightly lower than the theoretical predictions, but are in essential agreement within the combined uncertainties in the two values. A search has also been made for a 1P-degrees excited state of Li- in the vicinity of the 2 2P threshold. The saturation characteristics of the photodetachment of Li- and D- ions have been investigated over a range of laser powers. C1 OAK RIDGE NATL LAB,DEPT PHYS,OAK RIDGE,TN 37831. RP DELLWO, J (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 16 TC 19 Z9 19 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 OCT 1 PY 1992 VL 46 IS 7 BP 3924 EP 3928 DI 10.1103/PhysRevA.46.3924 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JV109 UT WOS:A1992JV10900047 ER PT J AU HART, RC GARRETT, WR PAYNE, MG AF HART, RC GARRETT, WR PAYNE, MG TI SUPPRESSION OF A 4-PHOTON RESONANCE BY 4-WAVE-MIXING NEAR AN INTERMEDIATE 3-PHOTON RESONANCE SO PHYSICAL REVIEW A LA English DT Article ID ENHANCED MULTIPHOTON IONIZATION; MULTI-PHOTON IONIZATION; 3RD-HARMONIC GENERATION; HARMONIC-GENERATION; FREQUENCY-SHIFT; CANCELLATION; INTERFERENCE; EXCITATION; BEAMS; XENON AB We use resonance ionization involving two colors in single-pass and retroreflected geometries to study the suppression of excitation of a four-photon resonance by an interference involving four-wave sum-frequency generation occurring near an intermediate three-photon resonance. The 6p[1/2](J = 0) state of xenon is excited by three blue photons plus one infrared photon. One beam, focused to I1 congruent-to 7 X 10(9) W/cm2, is nearly three-photon resonant with the 6s[3/2](J = 1) resonance; the second, unfocused beam (I2 congruent-to 2 X 10(7) W/cm2) is tuned to maintain exact four-photon resonance with the 6p[1/2](J = 1) state. One additional blue photon ionizes from the four-photon level. Third-harmonic light is generated by the first, nearly three-photon-resonant beam by four-wave sum-frequency mixing. One third-harmonic photon plus one photon from the second laser form a second excitation pathway to the four-photon level; destructive interference between the two pathways results in a reduction in the observed ionization. The degree of reduction depends on the xenon density and the detuning (both positive and negative) from three-photon resonance. This interference may be overcome by retroreflecting the nearly three-photon-resonant beam to provide an additional excitation pathway which generates no third harmonic. The study provides detailed information on the pressure-dependent range from exact resonance over which the familiar three-photon cancellation effect is operative; it shows that the interference occurs in high- and low-energy regions about three-photon resonance; and it establishes that interference is produced for large values of the phase mismatch even if the absorption of the interfering field is low. We compare our measurements of the reduction in ionization with predictions published by us elsewhere [M. G. Payne, J. C. Miller, R. C. Hart, and W. R. Garrett, Phys. Rev. A 44, 7684 (1991)]; excellent agreement is observed. We also report the observation of suppression of pressure-induced wing absorption into the three-photon state observed in a classic "hybrid" resonance mode of excitation. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. NR 23 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 OCT 1 PY 1992 VL 46 IS 7 BP 4213 EP 4219 DI 10.1103/PhysRevA.46.4213 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JV109 UT WOS:A1992JV10900082 ER PT J AU WOLF, RJ MANSOUR, KA LEE, MW RAY, JR AF WOLF, RJ MANSOUR, KA LEE, MW RAY, JR TI TEMPERATURE-DEPENDENCE OF ELASTIC-CONSTANTS OF EMBEDDED-ATOM MODELS OF PALLADIUM SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-DYNAMICS; GRAIN-BOUNDARIES; FCC METALS; NI; SURFACES; ALLOYS; NI3AL; STATE; CU AB The elastic constants of fcc palladium are calculated as a function of temperature for four different embedded-atom-method (EAM) models and compared to experimental values. Two of these EAM models have been derived by other workers whereas two of the models are new. Because of the elastic anomaly near 120 K, in the shear constant C44 of Pd, the use of this zero-temperature elastic constant to determine the Pd EAM potential leads to errors in the calculated C44 above the Debye temperature of 280 K where the potentials are to be used. To correct this behavior we determine the EAM potential in the two new EAM models so that C44 is in much better agreement with the experimental value above the Debye temperature. Interestingly in both of these new models the melting temperature is significantly higher and in better agreement with the experimental value of 1825 K. One of our models uses a conventional EAM third-neighbor interaction model whereas our other model is a fifth-neighbor interaction model. C1 CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634. RP WOLF, RJ (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER TECHNOL CTR,AIKEN,SC 29808, USA. NR 29 TC 41 Z9 41 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1992 VL 46 IS 13 BP 8027 EP 8035 DI 10.1103/PhysRevB.46.8027 PG 9 WC Physics, Condensed Matter SC Physics GA JT040 UT WOS:A1992JT04000008 ER PT J AU KWEI, GH LAWRENCE, JM CANFIELD, PC BEYERMANN, WP THOMPSON, JD FISK, Z LAWSON, AC GOLDSTONE, JA AF KWEI, GH LAWRENCE, JM CANFIELD, PC BEYERMANN, WP THOMPSON, JD FISK, Z LAWSON, AC GOLDSTONE, JA TI THERMAL-EXPANSION OF CE3BI4PT3 AT AMBIENT AND HIGH-PRESSURES SO PHYSICAL REVIEW B LA English DT Article ID HEAVY-FERMION SYSTEMS; EXCITATION SPECTRUM; KONDO-LATTICE; X-RAY; GAP; DIFFRACTION AB Ce3Bi4Pt3 is a cerium compound that exhibits a hybridization gap and concomitant semiconducting behavior in the coherent ground state. Using neutron powder diffraction, we have determined the variation of the lattice constant with temperature at two pressures (P = 10(-3) and 17.7 kbar), and determined the bulk modulus and atomic mean-square displacements for Ce3Bi4Pt3 and its normal analog, La3Bi4Pt3. The thermal expansion DELTAbeta in Ce3Bi4Pt3 exhibits a maximum at T(max) = 50 K at ambient pressure. Below 50 K, the bulk modulus DELTAB is proportional to TDELTAbeta. We apply a Gruneisen analysis, under the assumption that the free energy exhibits T/T0( V) scaling. The Gruneisen parameter deduced from the ratio DELTAB/TDELTAbeta is consistent with the value OMEGA = 36 deduced from the pressure variation of T(max). The analysis allows us to predict the temperature dependence of the 4f specific heat (DELTAC is-proportional-to DELTAbeta/OMEGA), which thus has a maximum at 50 K and a high-temperature entropy nearly equal the expected value R ln6. We argue that the maximum at 50 K reflects an (indirect) hybridization gap of order 100 K. We show further that the lattice constant anomaly DELTAa0 is proportional to the effective moment Tchi; this suggests that a relationship known to be valid for antiferromagnets, namely partial derivative(Tchi)/partial derivative T is-proportional-to DELTAC where DELTAC is the specific heat, may be valid for Ce3Bi4Pt3. Finally, we show that the temperature dependence of the mean-square atomic displacements is nearly identical for Ce3Bi4Pt3 and La3Bi4Pt3 and can be fitted by a simple Debye-Waller model; hence the expansion anomaly does not affect the average lattice dynamics. C1 UNIV CALIF IRVINE,DEPT PHYS,IRVINE,CA 92717. RP KWEI, GH (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Canfield, Paul/H-2698-2014 NR 22 TC 13 Z9 13 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1992 VL 46 IS 13 BP 8067 EP 8072 DI 10.1103/PhysRevB.46.8067 PG 6 WC Physics, Condensed Matter SC Physics GA JT040 UT WOS:A1992JT04000012 ER PT J AU QIU, ZQ PEARSON, J BADER, SD AF QIU, ZQ PEARSON, J BADER, SD TI MAGNETOOPTIC KERR ELLIPTICITY OF EPITAXIAL CO/CU OVERLAYERS AND SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Article ID MULTILAYERED FILMS; LAYERED STRUCTURES; ULTRATHIN CO/PT; ANISOTROPY; PD/CO; FE AB Co/Cu overlayers and superlattices were grown by molecular-beam epitaxy onto Cu(100) and Cu(111) single crystals. Electron diffraction and Auger spectroscopy were used to characterize the film growth and to confirm the epitaxy. Kerr ellipticities at 633 nm also were measured in situ both for Co overlayers that were 10-500 angstrom thick, and for various superlattices as a function of the number of bilayers in the film. The ellipticity data initially increase linearly as a function of total Co thickness, in accord with the additivity law expected for magneto-optic signals in the ultrathin limit. In order to simulate the observed thickness trends, however, it was necessary to assign a value to the complex magneto-optic coupling constant that differs from those reported previously. RP QIU, ZQ (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013; Qiu, Zi Qiang/O-4421-2016 OI Qiu, Zi Qiang/0000-0003-0680-0714 NR 18 TC 34 Z9 34 U1 2 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1992 VL 46 IS 13 BP 8195 EP 8200 DI 10.1103/PhysRevB.46.8195 PG 6 WC Physics, Condensed Matter SC Physics GA JT040 UT WOS:A1992JT04000027 ER PT J AU HOOD, RQ FALICOV, LM AF HOOD, RQ FALICOV, LM TI BOLTZMANN-EQUATION APPROACH TO THE NEGATIVE MAGNETORESISTANCE OF FERROMAGNETIC - NORMAL-METAL MULTILAYERS SO PHYSICAL REVIEW B LA English DT Article ID GIANT MAGNETORESISTANCE; RESIDUAL RESISTIVITY; BLOCH WALLS; EXCHANGE; SUPERLATTICES; FE/CR AB The Boltzmann equation is solved for a system consisting of a ferromagnetic-normal-metal-ferromagnetic metallic trilayer. The in-plane conductance of the film is calculated for two configurations: the ferromagnetic layers aligned (i) parallel and (ii) antiparallel to each other. The results explain the giant negative magnetoresistance encountered in these systems when an initial antiparallel arrangement is changed into a parallel configuration by application of an external magnetic field. The calculation depends on (a) geometric parameters (the thicknesses of the layers), (b) intrinsic metal parameters (number of conduction electrons, magnetization, and effective masses in the layers), (c) bulk sample properties (conductivity relaxation times), (d) interface scattering properties (diffuse scattering versus potential scattering at the interfaces), and (e) outer surface scattering properties (specular versus diffuse surface scattering). For perfect specular scattering at the surfaces the problem becomes identical to an infinite multilayer, periodic system. It is found that a large negative magnetoresistance requires, in general, considerable asymmetry in the interface scattering for the two spin orientations. All qualitative features of the experiments are reproduced. Quantitative agreement can be achieved with sensible values of the parameters. The effect can be conceptually explained based on considerations of phase-space availability for an electron of a given spin orientation as it travels through the multilayer sample in the various configurations. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP HOOD, RQ (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 23 TC 200 Z9 202 U1 2 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1992 VL 46 IS 13 BP 8287 EP 8296 DI 10.1103/PhysRevB.46.8287 PG 10 WC Physics, Condensed Matter SC Physics GA JT040 UT WOS:A1992JT04000040 ER PT J AU KOGAN, VG LEDVIJ, M BULAEVSKII, LN AF KOGAN, VG LEDVIJ, M BULAEVSKII, LN TI VORTEX NEAR THE SURFACE OF AN ANISOTROPIC SUPERCONDUCTOR - IMPLICATION FOR DECORATION SO PHYSICAL REVIEW B LA English DT Article AB The magnetic field of a vortex situated parallel to the nearby flat surface of an anisotropic superconductor, penetrates into the free space (unless the vortex points in a principal crystal direction). This makes feasible the decoration experiment to visualize the direction of vortices beneath the superconducting surface. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. INST PHYS,YU-11001 BELGRADE,YUGOSLAVIA. RP KOGAN, VG (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 7 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 OCT 1 PY 1992 VL 46 IS 13 BP 8425 EP 8428 DI 10.1103/PhysRevB.46.8425 PG 4 WC Physics, Condensed Matter SC Physics GA JT040 UT WOS:A1992JT04000056 ER PT J AU GRANT, JB MCMAHAN, AK AF GRANT, JB MCMAHAN, AK TI SPIN BAGS AND QUASI-PARTICLES IN DOPED LA2CUO4 SO PHYSICAL REVIEW B LA English DT Article ID 2-DIMENSIONAL HUBBARD-MODEL; T-J MODEL; ELECTRONIC-STRUCTURE; GROUND-STATE; HARTREE-FOCK; SINGLE-BAND; CU OXIDES; ONE HOLE; DENSITY; ANTIFERROMAGNET AB Limited configuration-interaction calculations beyond Hartree-Fock are reported for an ab initio derived eight-band effective Hamiltonian for La2CuO4. These results clearly implicate two important types of configurations, as well as the role of apical-O p(z) states, in the nature and dispersion of quasiparticle states associated with one hole doped into the parent insulator. The two types of configurations axe spatially inhomogeneous "spin bags" centered about a flipped spin relative to the host antiferromagnetic order and "doped Neel" configurations that leave the host spin order intact. Taken together these complementary parts are suggestive of the local singlet of Zhang and Rice. It is, however, the latter doped Neel configurations that carry those apical-O p(z) components that are primarily responsible for very shallow quasiparticle dispersion from k = (pi/2,pi/2), where the first holes are doped, towards (pi, 0). RP GRANT, JB (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 56 TC 94 Z9 94 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1992 VL 46 IS 13 BP 8440 EP 8455 DI 10.1103/PhysRevB.46.8440 PG 16 WC Physics, Condensed Matter SC Physics GA JT040 UT WOS:A1992JT04000059 ER PT J AU SUN, YR THOMPSON, JR CHRISTEN, DK OSSANDON, JG CHEN, YJ GOYAL, A AF SUN, YR THOMPSON, JR CHRISTEN, DK OSSANDON, JG CHEN, YJ GOYAL, A TI EFFECTS OF FIELD-SWEEP RATE ON THE MAGNETIZATION OF MELT-TEXTURED YBA2CU3O7-DELTA SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; ACTIVATED FLUX MOTION; RELAXATION; CREEP; CRYSTAL AB The effects of field-sweep rate K = partial derivative H/partial derivative t on magnetization hysteresis loops M (H) and on flux-creep studies M (t) in high-temperature superconductors have been investigated both theoretically and experimentally. We find the basic relation between M and K is, to first order, the following: M = const - {[dM/d ln(t)]ln(K)} - [Kt(eff)/10], where dM/d ln(t) = aC/30 is the flux-creep rate in a cylindrical sample of radius a, and t(eff) is an effective attempt time for vortex hopping. The largest possible M, which corresponds to the critical current density J(c0) in the absence of thermal activation, develops when K greater-than-or-equal-to K(max) = aC/[(1 + a alpha)t(eff)] with alpha = partial derivative J/partial derivative H. The time origin of flux creep, which is essential in studying the initial stages of relaxation, is given by t* = aC/K(1 + a alpha). The model agrees well with experiments on a melt-textured-growth sample of Y1Ba2Cu3O7-delta, yielding t(eff) is similar to 0.24+/-0.03 s at 27 K. By incorporating the calculated time origin into flux-creep studies of M(t), we obtain a very good description in terms of the interpolation formula from vortex-glass-collective pinning theory. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP SUN, YR (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 21 TC 17 Z9 17 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1992 VL 46 IS 13 BP 8480 EP 8486 DI 10.1103/PhysRevB.46.8480 PG 7 WC Physics, Condensed Matter SC Physics GA JT040 UT WOS:A1992JT04000062 ER PT J AU BORG, A KING, PL PIANETTA, P LINDAU, I MITZI, DB KAPITULNIK, A SOLDATOV, AV DELLALONGA, S BIANCONI, A AF BORG, A KING, PL PIANETTA, P LINDAU, I MITZI, DB KAPITULNIK, A SOLDATOV, AV DELLALONGA, S BIANCONI, A TI CA 3D UNOCCUPIED STATES IN BI2SR2CACU2O8 INVESTIGATED BY CA L(2,3) X-RAY-ABSORPTION NEAR-EDGE STRUCTURE SO PHYSICAL REVIEW B LA English DT Article ID MULTIPLE-SCATTERING ANALYSIS; ELECTRONIC-STRUCTURE; K-EDGE; CU-K; OXIDE SUPERCONDUCTORS; MODULATED STRUCTURE; SINGLE-CRYSTAL; FINE-STRUCTURE; XANES; TC AB The high-resolution Ca L2,3 x-ray-absorption near-edge-structure (XANES) spectrum of a Bi2Sr2CaCu2O8 single crystal has been measured by use of a magnetic-projection x-ray microscope probing a surface area of 200 x 200 mum2. The Ca L2,3 XANES spectrum is analyzed by performing a multiple-scattering XANES calculation in real space and comparing the results with the spectrum of CaF2. Good agreement between the calculated and experimental crystal-field splitting DELTA(f) of the Ca 3d final states is found and the splitting is shown to be smaller by 0.5 eV than in the initial state. The Ca 3d partial density of states is found to be close to the Fermi level in the initial state. The Ca-O(in plane) distance is shown to be a critical parameter associated with the shift of the Ca 3d states relative to the Fermi level; in particular, we have studied the effect of the out-of-plane dimpling mode of the in-plane oxygen atoms O(in plane) that will move the Ca 3d states on or off the Fermi level. This mode can therefore play a role in modulating the charge transfer between the two CuO2 planes separated by the Ca ions. C1 STANFORD UNIV,DEPT APPL PHYS,STANFORD,CA 94305. UNIV ROME LA SAPIENZA,DIPARTIMENTO FIS,I-00185 ROME,ITALY. UNIV TRONDHEIM,DEPT ELECT ENGN & COMP SCI,INST PHYS ELECTR,N-7034 TRONDHEIM,NORWAY. RP BORG, A (reprint author), STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,SLAC BIN 69,POB 4349,STANFORD,CA 94309, USA. RI Mitzi, David/B-6260-2012; Bianconi, Antonio/J-3997-2013; Soldatov, Alexander/E-9323-2012; OI Mitzi, David/0000-0001-5189-4612; Bianconi, Antonio/0000-0001-9795-3913; Soldatov, Alexander/0000-0001-8411-0546; della longa, stefano/0000-0002-8157-9530 NR 59 TC 12 Z9 13 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1992 VL 46 IS 13 BP 8487 EP 8495 DI 10.1103/PhysRevB.46.8487 PG 9 WC Physics, Condensed Matter SC Physics GA JT040 UT WOS:A1992JT04000063 ER PT J AU BAILY, AC KING, WE MERKLE, KL MESHII, M AF BAILY, AC KING, WE MERKLE, KL MESHII, M TI DEPENDENCE OF STAGE-I RECOVERY ON THE IRRADIATION DIRECTION IN COPPER DOPED WITH BERYLLIUM SO PHYSICAL REVIEW B LA English DT Note AB Electron irradiations of thin Cu-Be films near displacement threshold show that the types of Frenkel pairs produced depend on recoil direction. Irradiation along [100] very strongly favors the production of close pairs that anneal in substages I(A) and I(B), whereas irradiation along [110] produces mostly substage I(C) close pairs. Substage I(D) indicates the recombination of mobile defects; the larger Frenkel pair separation due to far-reaching replacement collision sequences along [110], as opposed to [100], is reflected in a shift of the peak recovery rate to higher temperature. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208. NR 13 TC 5 Z9 5 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1992 VL 46 IS 13 BP 8593 EP 8596 DI 10.1103/PhysRevB.46.8593 PG 4 WC Physics, Condensed Matter SC Physics GA JT040 UT WOS:A1992JT04000078 ER PT J AU QIU, ZQ PEARSON, J BADER, SD AF QIU, ZQ PEARSON, J BADER, SD TI OSCILLATORY INTERLAYER MAGNETIC COUPLING OF WEDGED CO/CU/CO SANDWICHES GROWN ON CU(100) BY MOLECULAR-BEAM EPITAXY SO PHYSICAL REVIEW B LA English DT Note ID COBALT FILMS; EXCHANGE; SUPERLATTICES; MAGNETORESISTANCE; MONOLAYERS; LAYERS; PERIOD AB Co/Cu/Co sandwiches were grown by molecular beam epitaxy onto a Cu(100) crystal with the intervening Cu layer fabricated to be wedge shaped. Electron diffraction was used to monitor the layer-by-layer growth. Films with 8, 14, and 20 monolayer- (ML) thick Co layers were investigated in situ by means of the magneto-optic Kerr effect. Characteristic hysteresis loops along the wedges, as a function of Cu thickness, unambiguously identify the oscillatory behavior in the sign of the exchange coupling between the two Co films. The oscillation periodicity (5.5 ML's of Cu) and, most importantly, the coupling strength are shown to be independent of the Co-layer thickness. RP QIU, ZQ (reprint author), ARGONNE NATL LAB,DIV MAT RES,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013; Qiu, Zi Qiang/O-4421-2016 OI Qiu, Zi Qiang/0000-0003-0680-0714 NR 28 TC 118 Z9 119 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 OCT 1 PY 1992 VL 46 IS 13 BP 8659 EP 8662 DI 10.1103/PhysRevB.46.8659 PG 4 WC Physics, Condensed Matter SC Physics GA JT040 UT WOS:A1992JT04000097 ER PT J AU CHO, JH HAO, ZD JOHNSTON, DC AF CHO, JH HAO, ZD JOHNSTON, DC TI MAGNETIZATION SCALING OF SINGLE-CRYSTAL BI2SR2CACU2O8 BELOW T(C) SO PHYSICAL REVIEW B LA English DT Note ID HIGH-TC SUPERCONDUCTORS; UPPER CRITICAL-FIELD; REVERSIBLE MAGNETIZATION; II SUPERCONDUCTORS; ANISOTROPY; TRANSITION; YBA2CU3O7; MECHANISM; VORTICES; FILMS AB We report magnetization M (H, T) measurements on a superconducting Bi2Sr2CaCu2O8 single crystal (T(c) congruent-to 85 K) for H parallel-to c, with 5 K less-than-or-equal-to T less-than-or-equal-to 90 K and 5 kG less-than-or-equal-to H less-than-or-equal-to 50 kG. The reversible data show a scaling behavior M (H, T) = m (H) A (T) below congruent-to 70 K and above the irreversibility temperature T(irr) congruent-to 30 K. This unexpected result shows that the upper critical field H(c2) is nearly independent of T over this T range, consistent with a T-independent order parameter found recently from other measurements below congruent-to 70 K. Unusual T dependences of the parameters kappa and H(c) are also inferred from the data. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP CHO, JH (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 38 TC 30 Z9 30 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1992 VL 46 IS 13 BP 8679 EP 8682 DI 10.1103/PhysRevB.46.8679 PG 4 WC Physics, Condensed Matter SC Physics GA JT040 UT WOS:A1992JT04000102 ER PT J AU SANJUAN, ML LAGUNA, MA PINOL, S CANFIELD, PC FISK, Z AF SANJUAN, ML LAGUNA, MA PINOL, S CANFIELD, PC FISK, Z TI RAMAN-STUDY OF R2-XCEXCUO4 (R=PR,ND,SM) - RESONANCE EFFECTS SO PHYSICAL REVIEW B LA English DT Note ID SINGLE-CRYSTALS; CU-O; OPTICAL-PROPERTIES; SCATTERING; PHONON; SUPERCONDUCTOR; ND2-XCEXCUO4; ND2CUO4; LA2CUO4; ND1.85CE0.15CUO4 AB We present resonant Raman scattering results of T'-phase cuprates R2-xCexCuO4 with R = Pr,Nd,Sm and x from 0 to 0. 175. The two modes appearing in zz polarization show a different resonant behavior: whereas the allowed A1g is nonresonant in pure compounds and decreases towards the uv in doped ones, the forbidden mode A* resonates towards uv in Nd and Sm samples with x not-equal 0, while for Pr compounds its evolution is similar to that of the A1g. We assign the A* mode to a locally modified A2u mode, due to oxygen relaxation around Ce4+. The resonance of this mode is interpreted in terms of electronic-band-structure calculations as involving transitions from O(1)p(z) + O(2)p(z) to empty cerium states, while the A1g decrease in the blue is attributed to light absorption due to the metallic character of doped samples. C1 UNIV AUTONOMA BARCELONA, CSIC, ICMB, E-08193 BARCELONA, SPAIN. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RP SANJUAN, ML (reprint author), UNIV ZARAGOZA, CSIC, FAC CIENCIAS, ICMA, E-50009 ZARAGOZA, SPAIN. RI Canfield, Paul/H-2698-2014; Sanjuan, Maria Luisa/E-9324-2016 OI Sanjuan, Maria Luisa/0000-0002-5793-2058 NR 33 TC 15 Z9 15 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1992 VL 46 IS 13 BP 8683 EP 8686 DI 10.1103/PhysRevB.46.8683 PG 4 WC Physics, Condensed Matter SC Physics GA JT040 UT WOS:A1992JT04000103 ER PT J AU LIU, JZ ZHANG, L LAN, MD SHELTON, RN FLUSS, MJ AF LIU, JZ ZHANG, L LAN, MD SHELTON, RN FLUSS, MJ TI OBSERVATION OF POWER-LAW TIME RELAXATION OF THE MAGNETIZATION OF A LUBA2CU3O7 SINGLE-CRYSTAL SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; HIGH-TEMPERATURE SUPERCONDUCTORS; CU-O CRYSTAL; FLUX-CREEP; DEPENDENCE; VORTEX; DECAY; PHASE AB A power-law dependence of the time relaxation of the magnetization in a LuBa2Cu3O7 single crystal has been observed over wide temperature and magnetic-field ranges. For T < 30 K, the decay rate S=lnM(t)/lnt is a linear function of T and can be expressed as S=beta(T) + delta, where delta is a constant decreasing with the increase of the applied field. By fitting beta(T) with a recent theoretical model, it is found that the effective pinning energy U(e) is independent of T and decreases logarithmically with the increase of the applied field. By comparing the values of delta with beta(T), it is concluded that at the low-temperature region, the magnetization relaxation is dominated by an unknown temperature-independent "tunneling" effect. The total relaxation rate can be expressed as S=[k(B)T/(1.18-0.24log10H)] + 63.11H-0.84. C1 LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,DIV CONDENSED MATTER & ANALYT SCI,LIVERMORE,CA 94550. RP LIU, JZ (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. NR 30 TC 13 Z9 13 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1992 VL 46 IS 14 BP 9123 EP 9127 DI 10.1103/PhysRevB.46.9123 PG 5 WC Physics, Condensed Matter SC Physics GA JV110 UT WOS:A1992JV11000042 ER PT J AU THURSTON, TR GEHRING, PM SHIRANE, G BIRGENEAU, RJ KASTNER, MA ENDOH, Y MATSUDA, M YAMADA, K KOJIMA, H TANAKA, I AF THURSTON, TR GEHRING, PM SHIRANE, G BIRGENEAU, RJ KASTNER, MA ENDOH, Y MATSUDA, M YAMADA, K KOJIMA, H TANAKA, I TI LOW-ENERGY INCOMMENSURATE SPIN EXCITATIONS IN SUPERCONDUCTING LA1.85SR0.15CUO4 SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC EXCITATIONS; LA2-XSRXCUO4; FLUCTUATIONS; DYNAMICS AB Neutron-scattering experiments with markedly improved signal-to-noise ratios have been performed on single-crystal superconducting La1.85Sr0.15CuO4 (T(c) = 33 K) at energies down to 1.5 meV. The measurements provide quantitative information on the temperature dependence of chi"(q,omega). Surprisingly, chi"(q(peak),omega) is approximately constant below T(c) for the measured energies 1.5 meV less-than-or-equal-to omega less-than-or-equal-to 6 meV, that is, for energies much less than the mean-field BCS gap energy of approximately 10 meV, hence implying other than conventional s-wave superconductivity. C1 MIT,DEPT PHYS,CAMBRIDGE,MA 02139. TOHOKU UNIV,DEPT PHYS,SENDAI,MIYAGI 980,JAPAN. YAMANASHI UNIV,FAC ENGN,INORGAN SYNTH FACIL,KOFU,YAMANASHI 400,JAPAN. RP THURSTON, TR (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Yamada, Kazuyoshi/C-2728-2009; Tanaka, Isao/D-1519-2012; Matsuda, Masaaki/A-6902-2016; OI Matsuda, Masaaki/0000-0003-2209-9526; Gehring, Peter/0000-0002-9236-2046 NR 14 TC 148 Z9 148 U1 2 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1992 VL 46 IS 14 BP 9128 EP 9131 DI 10.1103/PhysRevB.46.9128 PG 4 WC Physics, Condensed Matter SC Physics GA JV110 UT WOS:A1992JV11000043 ER PT J AU FRAHM, R WONG, J HOLT, JB LARSON, EM RUPP, B WAIDE, PA AF FRAHM, R WONG, J HOLT, JB LARSON, EM RUPP, B WAIDE, PA TI REAL-TIME PROBE OF REACTION CENTERS IN SOLID COMBUSTIONS ON THE SUBSECOND TIME SCALE SO PHYSICAL REVIEW B LA English DT Note ID X-RAY-ABSORPTION; SYNCHROTRON RADIATION; SPECTRA; SPECTROMETER; EXAFS AB A quick-scanning extended x-ray-absorption fine-structure (QEXAFS) technique has been devised to follow the local atomic coordination changes about selected reactants in a class of highly exothermic solid-combustion reactions. Real-time EXAFS measurements during the combustion were made in the time frame of a few seconds. By tuning the monochromator to a specific energy, at which maximum changes occur in an EXAFS feature of an element transforming from the reactant to the product phase, a time resolution of 20 ms was achieved. The Ni + Al --> NiAl reaction has been investigated in some detail in light of a possible intermediate phase in the so-called "after-burn" region. The present QEXAFS findings together with the recent time-resolved diffraction data on the same system lends experimental insights into the structural macrokinetics of this class of combustion systems. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. RP FRAHM, R (reprint author), DESY,HAMBURGER SYNCHROTRONSTRAHLUNGSLAB,NOTKESTR 85,W-2000 HAMBURG 52,GERMANY. NR 21 TC 23 Z9 24 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1992 VL 46 IS 14 BP 9205 EP 9208 DI 10.1103/PhysRevB.46.9205 PG 4 WC Physics, Condensed Matter SC Physics GA JV110 UT WOS:A1992JV11000055 ER PT J AU PICKLESIMER, A RICE, RA BRANDENBURG, R AF PICKLESIMER, A RICE, RA BRANDENBURG, R TI DELTA DEGREES OF FREEDOM IN TRINUCLEI .5. EXOTIC CONTRIBUTIONS SO PHYSICAL REVIEW C LA English DT Article ID TRITON BINDING; ENERGY AB Three-body channels constructed from two-body NDELTA and DELTADELTA states with non-nucleonic JTpi values (J, T, and pi denote conserved angular momentum, isospin, and parity, respectively) appear in the three-body Faddeev equation. The effects of such "exotic" channels on the triton binding energy (E(T)) are studied here for the first time, using the Argonne V28 DELTA model. Two types of exotic JTpi sectors are distinguished: "Pauli exotic" sectors from which NN channels are absent due to the Pauli principle and spin considerations, and "isospin exotic" sectors which have the non-nucleonic value (T = 2) of the two-body isospin. Pauli exotic contributions to E(T) are found to yield about 90 keV of repulsion, while isospin exotics add another 55 keV to this figure, for a total effect of about 145 keV. Exotic effects thus only slightly modify our previous V28-model result for E(T) based on nonexotic NNN, NNDELTA, NDELTADELTA, and DELTADELTADELTA configurations, moving it from about 7.29 MeV down to about 7.14 MeV. This worsens the triton binding energy defect to about 1.5 MeV. Exotic effects are further decomposed and overall implications are discussed as well. C1 PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907. UNIV BASEL,INST PHYS,CH-3056 BASEL,SWITZERLAND. RP PICKLESIMER, A (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. NR 15 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD OCT PY 1992 VL 46 IS 4 BP 1178 EP 1182 DI 10.1103/PhysRevC.46.1178 PG 5 WC Physics, Nuclear SC Physics GA JU931 UT WOS:A1992JU93100005 ER PT J AU BECVAR, F CEJNAR, P CHRIEN, RE KOPECKY, J AF BECVAR, F CEJNAR, P CHRIEN, RE KOPECKY, J TI TEST OF PHOTON STRENGTH FUNCTIONS BY A METHOD OF 2-STEP CASCADES SO PHYSICAL REVIEW C LA English DT Article ID NEUTRON RESONANCES; GIANT AB The applicability of sum-coincidence measurements of two-step cascade gamma-ray spectra for the determination of photon strength functions is discussed. The method is sensitive, not only to primary transitions, but also to secondary transitions proceeding from states of intermediate excitation. An experiment based on thermal neutron capture in a Nd target was undertaken at the Brookhaven National Laboratory High Flux Beam Reactor to test various hypotheses of E1 and M1 photon strength function in the Nd-144 nucleus. The results were compared to a series of model calculations, in which the back-shifted Fermi gas model is used to represent the level density. Models derived from the Fermi theory of liquids are strongly preferred. C1 NEDERLANDS ENERGY RES FDN,1755 ZG PETTEN,NETHERLANDS. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP BECVAR, F (reprint author), CHARLES UNIV,FAC MATH & PHYS,CS-18000 PRAGUE 8,CZECHOSLOVAKIA. NR 27 TC 29 Z9 30 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD OCT PY 1992 VL 46 IS 4 BP 1276 EP 1287 DI 10.1103/PhysRevC.46.1276 PG 12 WC Physics, Nuclear SC Physics GA JU931 UT WOS:A1992JU93100014 ER PT J AU VONEIFF, D WEIGEL, MK AF VONEIFF, D WEIGEL, MK TI RELATIVISTIC THOMAS-FERMI CALCULATIONS OF HOT NUCLEI SO PHYSICAL REVIEW C LA English DT Article ID MEAN FIELD-THEORY; LEVEL DENSITY PARAMETER; HIGHLY EXCITED NUCLEI; MATTER; FINITE; TEMPERATURES; STATE; PHASE; COLLISIONS; EQUATION AB Relativistic thermal Thomas-Fermi calculations for equilibrated hot nuclei have been performed for a nonlinear sigma-omega model. To isolate the properties of the hot nucleus from the contributions of the surrounding nucleon vapor, a subtraction procedure based on the "equivalent sharp radius" is applied. Various quantities describing hot nuclei and their temperature dependence are investigated. Special attention is devoted to the study of the level density parameter; we compare our results with those of a recently published nonrelativistic investigation. RP VONEIFF, D (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 40 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD OCT PY 1992 VL 46 IS 4 BP 1288 EP 1300 DI 10.1103/PhysRevC.46.1288 PG 13 WC Physics, Nuclear SC Physics GA JU931 UT WOS:A1992JU93100015 ER PT J AU WOLF, A CASTEN, RF AF WOLF, A CASTEN, RF TI EFFECTIVE CHARGES AND THEIR RELATION TO COLLECTIVITY AND SHELL STRUCTURE SO PHYSICAL REVIEW C LA English DT Article ID INTERACTING-BOSON MODEL; EVEN-EVEN NUCLEI; MIXED-SYMMETRY STATES; B(E2) VALUES; NEUTRON; PROTON; SYSTEMATICS; ISOTOPES; DEFORMATION; IBA-2 AB Effective boson charges, e(pi) and e(nu), are extracted for isotopic chains of most elements from Z = 42 to the actinides from analytic expressions derived in the interacting boson approximation. It is shown that, in valence space models, such effective charges carry an additional, physically intuitive interpretation, beyond the normal one of ensuring agreement of calculated electromagnetic transition rates with experiment. In valence models e(pi) and e(nu) are approximately proportional to the derivatives of M(E2:0(1)+ --> 2(1)+) with N(pi) and N(nu), respectively; that is, they are measures of the rate of change of collectivity. This feature allows one to disentangle the separate roles of protons and neutrons in the development of collectivity and exposes subtle effects originating in the valence p-n interaction. The results are striking. While for most elements, e(pi) > e(nu), as expected, certain regions display anomalously large e(nu), and, sometimes e(nu)/e(pi) > 1. These effects are interpreted in terms of the p -n interaction and, in particular, in terms of its monopole component which acts to shift single particle energies and, thereby, can alter shell gaps and the effective size of the valence space of one kind of particle as a function of the number of the other. Very small values of e(nu) near midshell are also interpreted in terms of the saturation of collectivity in such regions. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV COLOGNE,INST KERNPHYS,W-5000 COLOGNE 41,GERMANY. RP WOLF, A (reprint author), NUCL RES CTR NEGEV,POB 9001,IL-84190 BEER SHEVA,ISRAEL. NR 30 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 OCT PY 1992 VL 46 IS 4 BP 1323 EP 1333 DI 10.1103/PhysRevC.46.1323 PG 11 WC Physics, Nuclear SC Physics GA JU931 UT WOS:A1992JU93100018 ER PT J AU TURLER, A VONGUNTEN, HR LEYBA, JD HOFFMAN, DC LEE, DM GREGORICH, KE BENNETT, DA CHASTELER, RM GANNETT, CM HALL, HL HENDERSON, RA NURMIA, MJ AF TURLER, A VONGUNTEN, HR LEYBA, JD HOFFMAN, DC LEE, DM GREGORICH, KE BENNETT, DA CHASTELER, RM GANNETT, CM HALL, HL HENDERSON, RA NURMIA, MJ TI ACTINIDE PRODUCTION FROM THE INTERACTIONS OF CA-40 AND CA-44 WITH CH-248 AND A COMPARISON WITH THE CA-48 + CM-248 SYSTEM SO PHYSICAL REVIEW C LA English DT Article ID EXCITATION-ENERGY DIVISION; HEAVY-ION COLLISIONS; NUCLEON EXCHANGE; REACTION GE-76+ER-170; N/Z-EQUILIBRATION; DAMPED COLLISIONS; FUSION-FISSION; QUASI-FISSION; CM-248; U-238 AB Excitation functions have been measured for production of isotopes of Th through Fm in bombardments of Cm-248 with 231 - to 323-MeV Ca-44 ions and for the production of isotopes of Th through Cm in bombardments of Cm-248 With 230- to 291-MeV Ca-40 ions, respectively, using radiochemical methods. Upper production cross section limits were established for nuclides that were not positively detected. The experimental data were compared with the results of previous reaction studies in the systems Ca-40 + Cm-248 and Ca-48 + Cm-248. The half-widths of the Gaussian isotopic distributions were about 2.5 mass numbers for above-target elements and 5 to 5.5 mass numbers for below-target elements in all three systems. The majority of the cross section for the production of above-target nuclides was assigned to predominantly quasielastic reactions, whereas below-target nuclides were formed in deeply inelastic and asymmetric quasifission reactions. The maxima of the isotopic distributions were shown by others to closely follow the minimum of the potential energy surface in experiments with Ca-48, whereas in reactions with Ca-40 and Ca-44 we found that a transfer of 4 to 5 protons in either direction was required to reach the minimum in potential energy. The different neutron numbers of Ca-40, Ca-44, and Ca-48 are only partly reflected in the target-like reaction products. Based on a simple model, excitation energies and the maxima of the excitation functions were calculated and compared with the actual data. The yields for production of the below-target elements Th, U, and Pu were found to be two orders of magnitude smaller in the reaction of Ca-40 with Cm-248 than with Ca-48. The differences for production of above-target elements were largest between the reactions of Ca-44 and Ca-48 ions with Cm-248. Differences in below-target yields have been attributed either to losses of reaction products due to prompt fission, and/or to dynamic effects due to fusion hindrance. The data for above-target elements seem to confirm the presence of a strong isospin driving force, which in combination with favorable reaction energies results in surprisingly high yields in reactions with Ca-44 projectiles. C1 LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. UNIV BERN,RADIOCHEM LAB,CH-3000 BERN 9,SWITZERLAND. RP TURLER, A (reprint author), PAUL SCHERRER INST,DIV CHEM,CH-5232 VILLIGEN,SWITZERLAND. RI Turler, Andreas/D-3913-2014 OI Turler, Andreas/0000-0002-4274-1056 NR 58 TC 32 Z9 32 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD OCT PY 1992 VL 46 IS 4 BP 1364 EP 1382 DI 10.1103/PhysRevC.46.1364 PG 19 WC Physics, Nuclear SC Physics GA JU931 UT WOS:A1992JU93100023 ER PT J AU SANGSTER, TC BRITT, HC FIELDS, DJ HANSEN, LF LANIER, RG NAMBOODIRI, MN REMINGTON, BA WEBB, ML BEGEMANNBLAICH, M BLAICH, T FOWLER, MM WILHELMY, JB CHAN, YD DACAL, A HARMON, A POULIOT, J STOKSTAD, RG KAUFMAN, S VIDEBAEK, F FRAENKEL, Z PEILERT, G STOCKER, H GREINER, W BOTVINA, A MISHUSTIN, IN AF SANGSTER, TC BRITT, HC FIELDS, DJ HANSEN, LF LANIER, RG NAMBOODIRI, MN REMINGTON, BA WEBB, ML BEGEMANNBLAICH, M BLAICH, T FOWLER, MM WILHELMY, JB CHAN, YD DACAL, A HARMON, A POULIOT, J STOKSTAD, RG KAUFMAN, S VIDEBAEK, F FRAENKEL, Z PEILERT, G STOCKER, H GREINER, W BOTVINA, A MISHUSTIN, IN TI INTERMEDIATE MASS FRAGMENT EMISSION IN FE+AU COLLISIONS SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-ION COLLISIONS; SUBTHRESHOLD PION-PRODUCTION; QUANTUM MOLECULAR-DYNAMICS; UEHLING-UHLENBECK THEORY; HIGHLY EXCITED NUCLEI; MANY-BODY MODEL; POTENTIAL INTERNUCLEON INTERACTION; CLASSICAL SIMULATION; STATISTICAL MULTIFRAGMENTATION; MICROSCOPIC CALCULATIONS AB Experimental results are presented on the charge, velocity, and angular distributions of intermediate mass fragments (IMFs) for the reaction Fe+Au at bombarding energies of 50 and 100 MeV/nucleon. Results are compared to the quantum molecular dynamics (QMD) model and a modified QMD which includes a Pauli potential and follows the subsequent statistical decay of excited reaction products. The more complete model gives a good representation of the data and suggests that the major source of IMFs at large angles is due to multifragmentation of the target residue. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. ARGONNE NATL LAB,ARGONNE,IL 60439. WEIZMANN INST SCI,IL-76100 REHOVOT,ISRAEL. UNIV FRANKFURT,INST THEORET PHYS,W-6000 FRANKFURT,GERMANY. INST NUCL RES MOSCOW,MOSCOW 117312,USSR. RP SANGSTER, TC (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Stoecker, Horst/D-6173-2013 OI Stoecker, Horst/0000-0002-3282-3664 NR 77 TC 29 Z9 30 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD OCT PY 1992 VL 46 IS 4 BP 1404 EP 1415 DI 10.1103/PhysRevC.46.1404 PG 12 WC Physics, Nuclear SC Physics GA JU931 UT WOS:A1992JU93100027 ER PT J AU PEILERT, G KONOPKA, J STOCKER, H GREINER, W BLANN, M MUSTAFA, MG AF PEILERT, G KONOPKA, J STOCKER, H GREINER, W BLANN, M MUSTAFA, MG TI DYNAMIC TREATMENT OF FERMI MOTION IN A MICROSCOPIC DESCRIPTION OF HEAVY-ION COLLISIONS SO PHYSICAL REVIEW C LA English DT Review ID RELATIVISTIC NUCLEAR COLLISIONS; QUANTUM MOLECULAR-DYNAMICS; MANY-BODY MODEL; POTENTIAL INTERNUCLEON INTERACTION; INTRANUCLEAR CASCADE CALCULATION; SUBTHRESHOLD PION-PRODUCTION; UEHLING-UHLENBECK THEORY; MONTE-CARLO CALCULATION; HIGHLY EXCITED NUCLEI; GAS PHASE-TRANSITION AB A quasiclassical Pauli potential is used to simulate the Fermi motion of nucleons in a molecular dynamical simulation of heavy ion collisions. The thermostatic properties of a Fermi gas with and without interactions are presented. The inclusion of this Pauli potential into the quantum molecular dynamics (QMD) approach yields a model with well defined fermionic ground states, which is therefore also able to give the excitation energies of the emitted fragments. The deexcitation mechanisms (particle evaporation and multifragmentation) of the new model are investigated. The dynamics of the QMD with Pauli potential is tested by a wide range of comparisons of calculated and experimental double-differential cross sections for inclusive p-induced reactions at incident energies of 80 to 160 MeV. Results at 256 and 800 MeV incident proton energy are presented as predictions for completed experiments which are as yet unpublished. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP PEILERT, G (reprint author), UNIV FRANKFURT,INST THEORET PHYS,W-6000 FRANKFURT,GERMANY. RI Stoecker, Horst/D-6173-2013 OI Stoecker, Horst/0000-0002-3282-3664 NR 110 TC 73 Z9 76 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD OCT PY 1992 VL 46 IS 4 BP 1457 EP 1473 DI 10.1103/PhysRevC.46.1457 PG 17 WC Physics, Nuclear SC Physics GA JU931 UT WOS:A1992JU93100034 ER PT J AU KAUFMANN, WB SIEGEL, PB GIBBS, WR AF KAUFMANN, WB SIEGEL, PB GIBBS, WR TI DEEPLY BOUND PIONIC ATOMS VIA THE (PI-,P) REACTION SO PHYSICAL REVIEW C LA English DT Article ID ELASTIC-SCATTERING; STATES; NUCLEI AB We examine the essentials of the pion capture reaction (pi-, p) with the pion captured directly into an atomic orbit. The reaction is a promising candidate for the population of the 1s or 2p atomic levels of medium to heavy nuclei. These levels have never been observed, but rather reliable theoretical calculations indicate that they have relatively small widths. One reason for interest in these levels is that they give a direct measurement of the threshold pion-nucleus amplitude, which has a bearing on questions such as chiral-symmetry breaking in the nuclear medium and the anomalously small level shifts and widths of some of the more deeply-bound pionic atoms. The differential cross section for the process is calculated using the distorted-wave impulse approximation. It is found that for medium-mass nuclei and incident pion beams of 20-50 MeV cross sections of the order of microbarns, well within the capability of present meson factories, can be expected. The related process (pi-, n) is also studied. C1 CALIF STATE POLYTECH UNIV POMONA,POMONA,CA 91768. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NEW MEXICO STATE UNIV,LAS CRUCES,NM 88003. RP KAUFMANN, WB (reprint author), ARIZONA STATE UNIV,TEMPE,AZ 85287, USA. NR 32 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 OCT PY 1992 VL 46 IS 4 BP 1474 EP 1482 DI 10.1103/PhysRevC.46.1474 PG 9 WC Physics, Nuclear SC Physics GA JU931 UT WOS:A1992JU93100035 ER PT J AU FRANKLE, CM BOWMAN, JD BUSH, JE DELHEIJ, PPJ GOULD, CR HAASE, DG KNUDSON, JN MITCHELL, GE PENTTILA, S POSTMA, H ROBERSON, NR SEESTROM, SJ SZYMANSKI, JJ YUAN, VW ZHU, X AF FRANKLE, CM BOWMAN, JD BUSH, JE DELHEIJ, PPJ GOULD, CR HAASE, DG KNUDSON, JN MITCHELL, GE PENTTILA, S POSTMA, H ROBERSON, NR SEESTROM, SJ SZYMANSKI, JJ YUAN, VW ZHU, X TI PARITY NONCONSERVATION FOR THE O.88-EV NEUTRON RESONANCE IN BR-81 SO PHYSICAL REVIEW C LA English DT Article ID LA-139 AB The parity nonconserving longitudinal analyzing power P was measured for the E(n) = 0. 88 eV neutron resonance in Br-81. The value of P = +1.77 +/- 0.33 %; the sign is determined relative to the 0.73-eV resonance in La-139. C1 N CAROLINA STATE UNIV,RALEIGH,NC 27695. TRIANGLE UNIV NUCL LAB,DURHAM,NC 27708. TRIUMF,VANCOUVER V6T 2A3,BC,CANADA. DELFT UNIV TECHNOL,2600 GA DELFT,NETHERLANDS. DUKE UNIV,DURHAM,NC 27708. RP FRANKLE, CM (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Gould, Christopher/M-7676-2013 NR 21 TC 13 Z9 13 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD OCT PY 1992 VL 46 IS 4 BP 1542 EP 1545 DI 10.1103/PhysRevC.46.1542 PG 4 WC Physics, Nuclear SC Physics GA JU931 UT WOS:A1992JU93100044 ER PT J AU ESBENSEN, H BERTSCH, GF AF ESBENSEN, H BERTSCH, GF TI FRAGMENTATION REACTIONS OF LI-11 SO PHYSICAL REVIEW C LA English DT Article ID INTERACTION CROSS-SECTIONS; NUCLEAR RADII AB We examine the effect of the spatial correlation between the valence neutrons in Li-11 on the cross section for (Li-11, Li-9) reactions on different targets at 800 MeV/nucleon. The correlation suppresses the nuclear part of the cross section slightly but it strongly enhances the Coulomb part compared to an independent particle description. Agreement with measurement is significantly improved. C1 MICHIGAN STATE UNIV,CYCLOTRON LAB,E LANSING,MI 48824. RP ESBENSEN, H (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 10 TC 17 Z9 17 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD OCT PY 1992 VL 46 IS 4 BP 1552 EP 1554 DI 10.1103/PhysRevC.46.1552 PG 3 WC Physics, Nuclear SC Physics GA JU931 UT WOS:A1992JU93100047 ER PT J AU ALEXOPOULOS, T ALLEN, C ANDERSON, EW BALAMURALI, V BANERJEE, S BEERY, PD BHAT, P BISWAS, NN BUJAK, A CARMONY, DD CARTER, T COLE, P CHOI, Y DEBONTE, R DECARLO, V ERWIN, AE FINDEISEN, C GOSHAW, AT GUTAY, LJ HIRSCH, AS HOJVAT, C JENNINGS, JR KENNEY, VP LINDSEY, CS LOOMIS, C LOSECCO, JM MCMAHON, T MCMANUS, AP MORGAN, N NELSON, K OH, SH PORILE, NT RIMAI, A REEVES, D ROBERTSON, WJ SCHARENBERG, RP STRINGFELLOW, BC STAMPKE, SR THOMPSON, M TURKOT, F WALKER, WD WANG, CH WARCHOL, J WESSON, DK ZHAN, Y AF ALEXOPOULOS, T ALLEN, C ANDERSON, EW BALAMURALI, V BANERJEE, S BEERY, PD BHAT, P BISWAS, NN BUJAK, A CARMONY, DD CARTER, T COLE, P CHOI, Y DEBONTE, R DECARLO, V ERWIN, AE FINDEISEN, C GOSHAW, AT GUTAY, LJ HIRSCH, AS HOJVAT, C JENNINGS, JR KENNEY, VP LINDSEY, CS LOOMIS, C LOSECCO, JM MCMAHON, T MCMANUS, AP MORGAN, N NELSON, K OH, SH PORILE, NT RIMAI, A REEVES, D ROBERTSON, WJ SCHARENBERG, RP STRINGFELLOW, BC STAMPKE, SR THOMPSON, M TURKOT, F WALKER, WD WANG, CH WARCHOL, J WESSON, DK ZHAN, Y TI HYPERON PRODUCTION FROM PROTON-ANTIPROTON COLLISIONS AT ROOT-S = 1.8 TEV SO PHYSICAL REVIEW D LA English DT Article ID SQUARE-ROOT-S=1.8 TEV; PARTICLE-PRODUCTION; PBARP INTERACTIONS; KAON PRODUCTION; DRIFT CHAMBER; COLLIDER; ENERGY; PERFORMANCE; REGION; DESIGN AB The production properties of lambdas (LAMBDA0, LAMBDA0BAR) and cascades (XI-,XI-BAR) in the central region in ppBAR collisions at square-root s = 1.8 TeV at the Fermilab collider are reported. The transverse-momentum spectra of lambdas are measured as a function of multiplicity and the ratios of lambdas to protons (p,pBAR) and to all charged particles are studied as a function of transverse momentum and multiplicity. Moreover the average transverse momentum of cascades and the ratio of cascades to lambdas are presented. C1 DUKE UNIV,DEPT PHYS,DURHAM,NC 27706. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556. PURDUE UNIV,DEPT PHYS & CHEM,W LAFAYETTE,IN 47907. UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. RP ALEXOPOULOS, T (reprint author), DEPAUW UNIV,DEPT PHYS,GREENCASTLE,IN 46135, USA. NR 27 TC 18 Z9 18 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD OCT 1 PY 1992 VL 46 IS 7 BP 2773 EP 2786 DI 10.1103/PhysRevD.46.2773 PG 14 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JQ377 UT WOS:A1992JQ37700006 ER PT J AU DITZLER, WR HILL, D HOFTIEZER, J JOHNSON, KF LOPIANO, D SHIMA, T SHIMIZU, H SPINKA, H STANEK, R UNDERWOOD, D WAGNER, RG YOKOSAWA, A BURLESON, GR FAUCETT, JA FONTENLA, CA GARNETT, RW LUCHINI, C RAWOOLSULLIVAN, MW BHATIA, TS GLASS, G HIEBERT, JC KENEFICK, RA NATH, S NORTHCLIFFE, LC DAMJANOVICH, R JARMER, JJ VANINETTI, J JEPPESEN, RH TRIPARD, GE AF DITZLER, WR HILL, D HOFTIEZER, J JOHNSON, KF LOPIANO, D SHIMA, T SHIMIZU, H SPINKA, H STANEK, R UNDERWOOD, D WAGNER, RG YOKOSAWA, A BURLESON, GR FAUCETT, JA FONTENLA, CA GARNETT, RW LUCHINI, C RAWOOLSULLIVAN, MW BHATIA, TS GLASS, G HIEBERT, JC KENEFICK, RA NATH, S NORTHCLIFFE, LC DAMJANOVICH, R JARMER, JJ VANINETTI, J JEPPESEN, RH TRIPARD, GE TI NEUTRON-PROTON ELASTIC-SCATTERING SPIN-SPIN CORRELATION PARAMETER MEASUREMENTS BETWEEN 500 AND 800 MEV .1. C(SL) AND C(LL) AT BACKWARD CM ANGLES SO PHYSICAL REVIEW D LA English DT Review ID NUCLEON-NUCLEON-INTERACTION; PHASE-SHIFT ANALYSIS; DELTA-SIGMA-L; PI-NN DYNAMICS; RELATIVISTIC IMPULSE APPROXIMATION; SHORT-RANGE PART; QUARK-ANTIQUARK EXCITATIONS; DIFFERENTIAL CROSS-SECTION; PARTIAL-WAVE ANALYSIS; MESON-EXCHANGE MODEL AB Final results are presented for the spin-spin correlation parameters C(SL) and C(LL) for np elastic scattering with a polarized neutron beam incident on a polarized proton target. The beam kinetic energies are 484, 634, and 788 MeV, and the c.m. angular range is 80-degrees - 180-degrees. These data will contribute significantly to the determination of the isospin-0 amplitudes in the energy range from 500 to 800 MeV. C1 ARGONNE NATL LAB, DIV HIGH ENERGY PHYS, ARGONNE, IL 60439 USA. NEW MEXICO STATE UNIV, LAS CRUCES, NM 88003 USA. TEXAS A&M UNIV SYST, COLL STN, TX 77843 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. UNIV MONTANA, MISSOULA, MT 59812 USA. WASHINGTON STATE UNIV, PULLMAN, WA 99164 USA. NR 351 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 1550-7998 EI 1550-2368 J9 PHYS REV D JI Phys. Rev. D PD OCT 1 PY 1992 VL 46 IS 7 BP 2792 EP 2830 DI 10.1103/PhysRevD.46.2792 PG 39 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JQ377 UT WOS:A1992JQ37700008 ER PT J AU NARDI, E ROULET, E TOMMASINI, D AF NARDI, E ROULET, E TOMMASINI, D TI SIMULTANEOUS ANALYSIS OF Z' AND NEW FERMION EFFECTS - GLOBAL CONSTRAINTS IN E6 AND SO(10) MODELS SO PHYSICAL REVIEW D LA English DT Article ID PRECISION ELECTROWEAK EXPERIMENTS; QED RADIATIVE-CORRECTIONS; HEAVY FLAVOR PRODUCTION; PARITY NON-CONSERVATION; NEUTRAL GAUGE BOSONS; STANDARD MODEL; BACKWARD ASYMMETRY; E+E ANNIHILATION; Z-DECAYS; TAU->PI(K)NU DECAYS AB In grand unified theories based on extended (rank >4) gauge groups, the new gauge interactions require new fermions to ensure anomaly cancellation. We analyze the two kinds of new physics effects that are naturally present in these models: (i) the effects of the new neutral gauge bosons; (ii) the effects of a mixing of the known fermions with the new ones. Concentrating in particular on E6 and SO(10) models, we perform a global analysis of the electroweak data to constrain simultaneously these two new physics effects, and we pay particular attention to their reciprocal interplay. Our set of experimental results includes the data at the CERN e+e- collider LEP on the Z decay widths and fermion asymmetries, low-energy neutral-current experiments (atomic parity violation, nu scattering), the W-boson mass M(W), as well as charged-current measurements such as the various tests of the universality of the W-lepton couplings and the constraints on unitarity of the Cabibbo-Kobayashi-Maskawa matrix. We derive stringent bounds on the Z0-Z1 mixing (Absolute value of phi less than or similar to 0.02), on the fermion mixing parameters (sin2xi(i) less than or similar to 0.01 in most cases), and on the mass of the new gauge boson (M(Z') > 170-350 GeV, depending on the model). In many observables the different sources of new physics induce comparable effects that can compensate each other. We confront the results derived by considering only one effect at a time with the results of a joint analysis, and we point out which of the existing bounds are relaxed and which ones remain unaffected. C1 NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV VALENCIA,INST FIS CORPUSCULAR,E-46100 BURJASSOT,SPAIN. RP NARDI, E (reprint author), UNIV MICHIGAN,RANDALL LAB PHYS,ANN ARBOR,MI 48109, USA. RI Tommasini, Daniele/L-4718-2014; OI Tommasini, Daniele/0000-0002-7997-3088; Nardi, Enrico/0000-0001-7165-3808 NR 109 TC 50 Z9 50 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD OCT 1 PY 1992 VL 46 IS 7 BP 3040 EP 3061 DI 10.1103/PhysRevD.46.3040 PG 22 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JQ377 UT WOS:A1992JQ37700034 ER PT J AU DANIEL, D GUPTA, R KILCUP, GW PATEL, A SHARPE, SR AF DANIEL, D GUPTA, R KILCUP, GW PATEL, A SHARPE, SR TI PHENOMENOLOGY WITH WILSON FERMIONS USING SMEARED SOURCES SO PHYSICAL REVIEW D LA English DT Article ID LATTICE QCD; DISTRIBUTION AMPLITUDE; 4-FERMION OPERATORS; STAGGERED FERMIONS; QUENCHED SPECTRUM; CURRENT-ALGEBRA; QUARK MASSES; CONTINUUM AB We investigate the use of two types of nonlocal ("smeared") sources for quark propagators in quenched lattice QCD at beta = 6.O using Wilson fermions at kappa = 0.154 and 0.155. We present results for the hadron mass spectrum, meson decay constants, quark masses, the chiral condensate, and the quark distribution amplitude of the pion. The use of smeared sources leads to a considerable improvement over previous results. We find a disturbing discrepancy between the baryon spectra obtained using Wuppertal and wall sources. We find good signals in the ratio of correlators used to calculate the quark mass and the chiral condensate and show that the extrapolation to the chiral limit is smooth. C1 OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210. INDIAN INST SCI,CTR SUPERCOMP EDUC & RES,BANGALORE 560012,KARNATAKA,INDIA. INDIAN INST SCI,CTR THEORET STUDIES,BANGALORE 560012,KARNATAKA,INDIA. CONTINUOUS ELECTRON BEAM ACCELERATOR FACIL,THEORY GRP,NEWPORT NEWS,VA 23606. RP DANIEL, D (reprint author), LOS ALAMOS NATL LAB,T-8,MS-B285,LOS ALAMOS,NM 87545, USA. RI Patel, Apoorva/F-4359-2010 NR 36 TC 39 Z9 39 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD OCT 1 PY 1992 VL 46 IS 7 BP 3130 EP 3145 DI 10.1103/PhysRevD.46.3130 PG 16 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JQ377 UT WOS:A1992JQ37700041 ER PT J AU MALTMAN, K AF MALTMAN, K TI HOW SECURE ARE PREDICTIONS FOR DIBARYONS IN THE MIT BAG MODEL SO PHYSICS LETTERS B LA English DT Article ID DIHYPERON; ANOMALIES; BREAKING; ENERGY AB It is pointed out that dibaryons exist in the MIT bag model for only a very narrow range of values of the bag constant. Restriction to this range cannot be justified either by theoretical considerations or by phenomenological constraints arising from the baryon sector. C1 LOS ALAMOS NATL LAB,PDO,LOS ALAMOS,NM 87545. RP MALTMAN, K (reprint author), YORK UNIV,DEPT MATH & STAT,4700 KEELE ST,N YORK M3J 1P3,ONTARIO,CANADA. NR 22 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD OCT 1 PY 1992 VL 291 IS 4 BP 371 EP 374 DI 10.1016/0370-2693(92)91389-Q PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JQ006 UT WOS:A1992JQ00600004 ER PT J AU BIGLARI, H DIAMOND, PH AF BIGLARI, H DIAMOND, PH TI A SELF-CONSISTENT THEORY OF COLLECTIVE ALPHA-PARTICLE LOSSES INDUCED BY ALFVENIC TURBULENCE SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Letter ID WAVES; TOKAMAK; PLASMA; DESTABILIZATION AB The nonlinear dynamics of kinetic Alfven waves, resonantly excited by energetic ions/alpha particles, is investigated. It is shown that alpha particles govern both linear instability and nonlinear saturation dynamics, while the background magnetohydrodynamic turbulence results only in a nonlinear real frequency shift. The most efficient saturation mechanism is found to be self-induced profile modification. Expressions for the fluctuation amplitudes and the alpha-particle radial flux are self-consistently derived. The work represents the first self-consistent, analytical, turbulent treatment of collective alpha-particle losses by Alfvenic fluctuations. C1 UNIV CALIF SAN DIEGO,DEPT PHYS B019,LA JOLLA,CA 92093. RP BIGLARI, H (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 12 TC 6 Z9 6 U1 2 U2 2 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD OCT PY 1992 VL 4 IS 10 BP 3009 EP 3012 DI 10.1063/1.860411 PG 4 WC Physics, Fluids & Plasmas SC Physics GA JR694 UT WOS:A1992JR69400001 ER PT J AU CARRERAS, BA SIDIKMAN, K DIAMOND, PH TERRY, PW GARCIA, L AF CARRERAS, BA SIDIKMAN, K DIAMOND, PH TERRY, PW GARCIA, L TI THEORY OF SHEAR-FLOW EFFECTS ON LONG-WAVELENGTH DRIFT WAVE TURBULENCE SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID POLOIDAL ROTATION; FIELD; GENERATION AB A simple, paradigmatic model of long-wavelength drift wave turbulence in the presence of a sheared poloidal flow is analyzed in detail. Linear theory predicts that velocity shear induces a strong stabilizing effect by shifting the eigenmode away from the k.B=0 resonant surface, thereby enhancing ion damping. However, multiple-helicity numerical calculations indicate that velocity shear has little or no effect on saturated fluctuation levels. Analysis suggests that this result is related to the incidence of a spiky, radially intermittent profile of the turbulent fluctuation levels, induced by low-q mode rational surfaces, and occurs when the turbulent diffusivity exceeds the product of diamagnetic frequency and gyroradius squared. An analytical theory that explains the observed suppression of velocity and magnetic shear damping is presented. C1 UNIV CALIF SAN DIEGO, LA JOLLA, CA 92093 USA. GEN ATOM, SAN DIEGO, CA 92186 USA. UNIV WISCONSIN, MADISON, WI 53706 USA. UNIV COMPLUTENSE MADRID, MADRID 3, SPAIN. RP CARRERAS, BA (reprint author), OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. RI Garcia, Luis/A-5344-2015 OI Garcia, Luis/0000-0002-0492-7466 NR 18 TC 80 Z9 80 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD OCT PY 1992 VL 4 IS 10 BP 3115 EP 3131 DI 10.1063/1.860420 PG 17 WC Physics, Fluids & Plasmas SC Physics GA JR694 UT WOS:A1992JR69400012 ER PT J AU WALTZ, RE DOMINGUEZ, RR HAMMETT, GW AF WALTZ, RE DOMINGUEZ, RR HAMMETT, GW TI GYRO-LANDAU FLUID MODELS FOR TOROIDAL GEOMETRY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID TEMPERATURE-GRADIENT MODE; DRIVEN MODES; SIMULATION; TRANSPORT AB Gyro-Landau fluid model equations provide first-order time advancement for a limited number of moments of the gyrokinetic equation, while approximately preserving the effects of the gyroradius averaging and Landau damping. This paper extends the work of Hammett and Perkins [Phys. Rev. Lett. 64, 3019 (1990)] for electrostatic motion parallel to the magnetic field and EXB motion to include the gyroaveraging linearly and the curvature drift motion. The equations are tested by comparing the ion-temperature-gradient mode linear growth rates for the model equations with those of the exact gyrokinetic theory over a full range of parameters. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP WALTZ, RE (reprint author), GEN ATOM,SAN DIEGO,CA 92186, USA. RI Hammett, Gregory/D-1365-2011 OI Hammett, Gregory/0000-0003-1495-6647 NR 19 TC 93 Z9 94 U1 1 U2 11 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD OCT PY 1992 VL 4 IS 10 BP 3138 EP 3151 DI 10.1063/1.860422 PG 14 WC Physics, Fluids & Plasmas SC Physics GA JR694 UT WOS:A1992JR69400014 ER PT J AU VEERASINGAM, R KLEVANS, EH WERLEY, KA NEBEL, RA WEBER, PG AF VEERASINGAM, R KLEVANS, EH WERLEY, KA NEBEL, RA WEBER, PG TI SIMULATIONS OF CONSTANT POLOIDAL BETA-EXPERIMENTS ON ZT-40M USING A ONE-DIMENSIONAL MULTISPECIES TRANSPORT MODEL SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID REVERSED-FIELD-PINCH; MAGNETIC-FIELD; PLASMAS; FLUCTUATIONS; CONFINEMENT; IMPURITIES AB A one-dimensional (1-D) multispecies transport model for the reversed-field pinch plasma, which includes neutral deuterium and a coronal nonequilibrium model for impurities, is used to simulate a set of ZT-40M [Fusion Technol. 10, 307 (1986)] experiments. In these experiments, the radiation fraction is varied from 15% to 95% by use of krypton seeding, while the plasma operating parameters I(phi) and n(e) are constrained to within a small variation from a fixed operating point. In effect, these experiments maintain an almost constant beta(thetae) on axis for the range of radiation fractions. The simulations match experimental estimates of particle, energy, and nonradiative confinement times, and of the electron poloidal beta. The results show that the anomalous thermal transport needed to reproduce the observed experimental behavior, i.e., constant beta(thetae) on axis, can be modeled by use of a small amount of parallel thermal conduction. Such a model phenomenologically accounts for anomalous heat transport due to fluctuations or stochastic field line diffusion. This model is also used for parametric studies on the design conditions of ZTH [Bull. Am. Phys. Soc. 31, 1546 (1984)]. To achieve the ZTH design values it is necessary for particle and thermal diffusivities to improve by a factor of 10-15 over ZT-40M. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP VEERASINGAM, R (reprint author), PENN STATE UNIV,DEPT NUCL ENGN,UNIV PK,PA 16802, USA. NR 35 TC 0 Z9 0 U1 1 U2 1 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD OCT PY 1992 VL 4 IS 10 BP 3241 EP 3250 DI 10.1063/1.860379 PG 10 WC Physics, Fluids & Plasmas SC Physics GA JR694 UT WOS:A1992JR69400023 ER PT J AU SHAING, KC AF SHAING, KC TI AN ESTIMATE OF THE ION ORBIT LOSS RATE IN TOKAMAKS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID EDGE ELECTRIC-FIELD; L-H TRANSITION; POLOIDAL ROTATION; MODE; PLASMA; TRANSPORT AB The ion orbit loss rate in the edge region of a tokamak is estimated from an orbit-averaged Coulomb collision operator. The mechanism of the ion orbit loss in a tokamak is qualitatively different from that of the electron loss in a mirror machine, because ion orbit loss in a tokamak results from the coupling between the configuration-space diffusion and the velocity-space scattering, while the electron loss in a mirror machine results from the velocity-space scattering. Despite this difference, the magnitudes of the ion orbit loss rate in a tokamak estimated from these two concepts are similar. Because the ion orbit loss flux is related to the plasma viscosity, it represents a loss of poloidal momentum. RP SHAING, KC (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 27 TC 18 Z9 18 U1 0 U2 2 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD OCT PY 1992 VL 4 IS 10 BP 3310 EP 3315 DI 10.1063/1.860385 PG 6 WC Physics, Fluids & Plasmas SC Physics GA JR694 UT WOS:A1992JR69400030 ER PT J AU SPONG, DA CARRERAS, BA HEDRICK, CL AF SPONG, DA CARRERAS, BA HEDRICK, CL TI LINEARIZED GYROFLUID MODEL OF THE ALPHA-DESTABILIZED TOROIDAL ALFVEN EIGENMODE WITH CONTINUUM DAMPING EFFECTS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID INSTABILITY; TOKAMAKS; TFTR AB The toroidicity-induced shear Alfven eigenmode (TAE) can be destabilized by energetic particle populations through inverse Landau damping. It may also be significantly damped by coupling with adjacent shear Alfven continua. A gyrofluid model with Landau closure that includes both of these effects is developed and applied to this instability. The model consists of the usual reduced magnetohydrodynamic (MHD) equations for the evolution of the poloidal flux and toroidal component of vorticity, coupled with equations for the density and parallel velocity moments of the energetic species. The latter two equations include Landau damping/growth effects through use of a consistent closure relation, which is equivalent to a two-pole approximation to the plasma dispersion function. These equations are solved numerically using a three-dimensional initial value code (TAE/FL) in toroidal geometry. The unstable TAE growth rate and continuum damping rates are compared with recent analytical estimates, and reasonable agreement is obtained. RP SPONG, DA (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Spong, Donald/C-6887-2012 OI Spong, Donald/0000-0003-2370-1873 NR 28 TC 45 Z9 45 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD OCT PY 1992 VL 4 IS 10 BP 3316 EP 3328 DI 10.1063/1.860386 PG 13 WC Physics, Fluids & Plasmas SC Physics GA JR694 UT WOS:A1992JR69400031 ER PT J AU FISHBINE, BH MATHER, JW WOODALL, DM AF FISHBINE, BH MATHER, JW WOODALL, DM TI 80-KV, 8.9-KJ PLASMA-FOCUS EXPERIMENTS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID DISCHARGES AB High-voltage, low-energy, Mather-geometry plasma focus experiments were performed to study large sheath formation input power, fast rundown, and current optimization and stabilization during collapse and pinch. For the parameters of these experiments, large bank impedance and short implosion time lead to small pinch current depression. Double-peaked x-ray emission data correlates with I-dot compression spikes; Cu K(alpha) radiation is believed to dominate. I-dot data indicate that on-axis sheath bouncing occurs. Center electrode damage, reduced compression dynamics, and sheath bouncing suggest the use of larger electrode radius for these operating parameters. B-dot probe data indicate a rundown current sheath full-width-half-maximum thickness of 7.4 mm. C1 UNIV NEW MEXICO,DEPT PHYS & ASTRON,ALBUQUERQUE,NM 87131. EG&G IDAHO INC,IDAHO FALLS,ID 83415. NR 19 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD OCT PY 1992 VL 4 IS 10 BP 3344 EP 3349 DI 10.1063/1.860389 PG 6 WC Physics, Fluids & Plasmas SC Physics GA JR694 UT WOS:A1992JR69400034 ER PT J AU MURPHY, DP PECHACEK, RE TAGGART, DP FERNSLER, RF HUBBARD, RF SLINKER, SP MEGER, RA AF MURPHY, DP PECHACEK, RE TAGGART, DP FERNSLER, RF HUBBARD, RF SLINKER, SP MEGER, RA TI ELECTRON-BEAM TRACKING IN A PREFORMED DENSITY CHANNEL SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article AB High-current charged particle beams can be guided by reduced density channels. Such guiding occurs when the distribution of plasma currents in the density channel causes a net attractive force to be exerted on the beam. In particular, a relativistic electron beam (REB) injected parallel to a spatially offset, reduced density channel is pulled toward the channel. The force exerted on the beam is predicted to increase as the beam current increases and as the offset between the beam and the channel increases out to offsets equal to the channel radius. An experiment with a 1 MV, almost-equal-to 10 kA beam was performed that demonstrates this effect. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP MURPHY, DP (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 31 TC 12 Z9 12 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD OCT PY 1992 VL 4 IS 10 BP 3407 EP 3417 DI 10.1063/1.860396 PG 11 WC Physics, Fluids & Plasmas SC Physics GA JR694 UT WOS:A1992JR69400041 ER PT J AU MAZZUCATO, E AF MAZZUCATO, E TI RELATIVISTIC EFFECTS ON MICROWAVE REFLECTOMETRY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Note ID OBLIQUE PROPAGATION; PLASMAS; ABSORPTION AB A simple formula for tracking the cutoffs of waves in the electron cyclotron range of frequencies is presented for plasmas with electron temperatures similar to those of existing large tokamaks (approximately 10 keV) and conditions of negligible wave absorption. RP MAZZUCATO, E (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 8 TC 30 Z9 30 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD OCT PY 1992 VL 4 IS 10 BP 3460 EP 3461 DI 10.1063/1.860354 PG 2 WC Physics, Fluids & Plasmas SC Physics GA JR694 UT WOS:A1992JR69400052 ER PT J AU FALICOV, LM AF FALICOV, LM TI METALLIC MAGNETIC SUPERLATTICES SO PHYSICS TODAY LA English DT Article C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP FALICOV, LM (reprint author), UNIV CALIF BERKELEY,PHYS,BERKELEY,CA 94720, USA. NR 8 TC 46 Z9 46 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD OCT PY 1992 VL 45 IS 10 BP 46 EP 51 DI 10.1063/1.881350 PG 6 WC Physics, Multidisciplinary SC Physics GA JU119 UT WOS:A1992JU11900008 ER PT J AU DUBOIS, D KNORR, G PAYNE, G AF DUBOIS, D KNORR, G PAYNE, G TI NICHOLSON,DWIGHT - OBITUARY SO PHYSICS TODAY LA English DT Item About an Individual C1 UNIV IOWA,IOWA CITY,IA 52242. RP DUBOIS, D (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD OCT PY 1992 VL 45 IS 10 BP 136 EP 136 DI 10.1063/1.2809850 PG 1 WC Physics, Multidisciplinary SC Physics GA JU119 UT WOS:A1992JU11900018 ER PT J AU GURNETT, D JOYCE, G AF GURNETT, D JOYCE, G TI GOERTZ,CHRISTOPH,K. - OBITUARY SO PHYSICS TODAY LA English DT Item About an Individual C1 USN,RES LAB,WASHINGTON,DC 20375. RP GURNETT, D (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD OCT PY 1992 VL 45 IS 10 BP 136 EP 137 DI 10.1063/1.2809851 PG 2 WC Physics, Multidisciplinary SC Physics GA JU119 UT WOS:A1992JU11900019 ER PT J AU JACKSON, PJ DELHAIZE, E KUSKE, CR AF JACKSON, PJ DELHAIZE, E KUSKE, CR TI BIOSYNTHESIS AND METABOLIC ROLES OF CADYSTINS (GAMMA-EC)NG AND THEIR PRECURSORS IN DATURA-INNOXIA SO PLANT AND SOIL LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL SYMP ON GENETIC ASPECTS OF PLANT MINERAL NUTRITION CY SEP 30-OCT 04, 1991 CL CANBERRA, AUSTRALIA DE BIOSYNTHESIS OF CADYSTIN; CADMIUM TOLERANCE; CLASS-III METALLOTHIONEIN; CYSTEINE; DATURA-INNOXIA; GLUTATHIONE; IRON ACCUMULATION; PHYTOCHELATIN; POLY(GAMMA-GLUTAMYLCYSTEINYL)-GLYCINE ID METAL-BINDING PEPTIDES; FISSION YEAST; SCHIZOSACCHAROMYCES-POMBE; SUSPENSION-CULTURES; CADMIUM; PHYTOCHELATINS; GLUTATHIONE; BARLEY; CELLS; INHIBITION AB Metal-tolerant Datura innoxia cells synthesize large amounts of cadystin, [poly(gamma-glutamylcysteinyl) glycines, (gamma-EC)(n)G, n = 2 - 5], a class of metal-binding polypeptides, when exposed to Cd. These polypeptides have a high affinity for Cd (II) and certain other metal ions and are thought to play a role in metal tolerance in higher plants. Cells rapidly synthesize these metal-binding polypeptides when exposed to Cd and cellular concentrations of glutathione and cysteine, precursors for the synthesis of these compounds, are initially depleted then rapidly replenished. The time-frame of de novo polypeptide, glutathione and cysteine biosynthesis suggests that this pathway is, at least initially, regulated at the enzyme level. Significant amounts of Fe are associated with Cd: polypeptide complexes isolated from D. innoxia. Exposure of cultures to Cd results in an increased Fe accumulation by the cells. All the additional Fe found in the soluble portion of cell extracts is associated with the Cd: polypeptide complexes. The physiological significance of the synthesis of these polypeptides and their precursors and its relevance to Cd tolerance and metal homeostasis are discussed. RP JACKSON, PJ (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,GENOM & STRUCT BIOL GRP,LOS ALAMOS,NM 87545, USA. RI Delhaize, Emmanuel/I-6536-2013 NR 34 TC 13 Z9 15 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0032-079X J9 PLANT SOIL JI Plant Soil PD OCT PY 1992 VL 146 IS 1-2 BP 281 EP 289 DI 10.1007/BF00012022 PG 9 WC Agronomy; Plant Sciences; Soil Science SC Agriculture; Plant Sciences GA KJ418 UT WOS:A1992KJ41800034 ER PT J AU OSULLIVAN, E KAVANAGH, JA AF OSULLIVAN, E KAVANAGH, JA TI CHARACTERISTICS AND PATHOGENICITY OF PYTHIUM SPP ASSOCIATED WITH DAMPING-OFF OF SUGAR-BEET IN IRELAND SO PLANT PATHOLOGY LA English DT Article AB Five hundred and eight Pythium isolates were obtained from diseased sugar-beet seedlings in the field from beet field soils in Ireland. Pythium sylvaticum and P. intermedium were the dominant species, together representing 86% of isolates, and P.salpingophorum, P. ultimum, P. mamillatum, P. oligandrum and Pythium 'group HS' were the other species identified. The cultural characteristics of these species corresponded generally with previous descriptions, with the exception of P. sylvaticum and P. mamillatum. which varied in some respects. In glasshouse pathogenicity tests, P. sylvaticum, P. intermedium, P. salpingophorum, P. ultimum, P. mamillatum and one unidentified Pythium isolate caused pre-emergence and early post-emergence damping-off of sugar-beet seedlings. Isolates of P. oligandrum and Pythium 'group HS' were weakly pathogenic or not pathogenic to beet seedlings. C1 NATL UNIV IRELAND UNIV COLL DUBLIN,DEPT ENVIRONM RESOURCE MANAGEMENT PLANT PATHOL,DUBLIN 4,IRELAND. RP OSULLIVAN, E (reprint author), OAK PK RES CTR,DEPT PLANT PATHOL ENTOMOL,CARLOW,IRELAND. NR 27 TC 7 Z9 7 U1 0 U2 1 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0032-0862 J9 PLANT PATHOL JI Plant Pathol. PD OCT PY 1992 VL 41 IS 5 BP 582 EP 590 PG 9 WC Agronomy; Plant Sciences SC Agriculture; Plant Sciences GA JW060 UT WOS:A1992JW06000009 ER PT J AU GREENE, RM GEIDER, RJ KOLBER, Z FALKOWSKI, PG AF GREENE, RM GEIDER, RJ KOLBER, Z FALKOWSKI, PG TI IRON-INDUCED CHANGES IN LIGHT HARVESTING AND PHOTOCHEMICAL ENERGY-CONVERSION PROCESSES IN EUKARYOTIC MARINE-ALGAE SO PLANT PHYSIOLOGY LA English DT Article ID PHOTOSYSTEM-II; REACTION CENTERS; RHODOPSEUDOMONAS-SPHAEROIDES; CHLOROPHYLL FLUORESCENCE; NITROGEN LIMITATION; CHLOROPLASTS; PHOTOSYNTHESIS; PHYTOPLANKTON; COMPLEX; CHLORELLA AB The role of iron in regulating light harvesting and photochemical energy conversion processes was examined in the marine unicellular chlorophyte Dunaliella tertiolecta and the marine diatom Phaeodactylum tricornutum. In both species, iron limitation led to a reduction in cellular chlorophyll concentrations, but an increase in the in vivo, chlorophyll-specific, optical absorption cross-sections. Moreover, the absorption cross-section of photosystem II, a measure of the photon target area of the traps, was higher in iron-limited cells and decreased rapidly following iron addition. Iron-limited cells exhibited reduced variable/maximum fluorescence ratios and a reduced fluorescence per unit absorption at all wavelengths between 400 and 575 nm. Following iron addition, variable/maximum fluorescence ratios increased rapidly, reaching 90% of the maximum within 18 to 25 h. Thus, although more light was absorbed per unit of chlorophyll, iron limitation reduced the transfer efficiency of excitation energy in photosystem II. The half-time for the oxidation of primary electron acceptor of photosystem II, calculated from the kinetics of decay of variable maximum fluorescence, increased 2-fold under iron limitation. Quantitative analysis of western blots revealed that cytochrome f and subunit IV (the plastoquinone-docking protein) of the cytochrome b6/f complex were also significantly reduced by lack of iron; recovery from iron limitation was completely inhibited by either cycloheximide or chloramphenicol. The recovery of maximum photosynthetic energy conversion efficiency occurs in three stages: (a) a rapid (3-5 h) increase in electron transfer rates on the acceptor side of photosystem II correlated with de novo synthesis of the cytochrome b6/f complex; (b) an increase (10-15 h) in the quantum efficiency correlated with an increase in D1 accumulation; and (c) a slow (>18 h) increase in chlorophyll levels accompanied by an increase in the efficiency of energy transfer from the light-harvesting chlorophyll proteins to the reaction centers. C1 UNIV DELAWARE,COLL MARINE STUDIES,LEWES,DE 19958. RP GREENE, RM (reprint author), BROOKHAVEN NATL LAB,DIV OCEANOG & ATMOSPHER SCI,UPTON,NY 11973, USA. RI Greene, Richard/G-9685-2013 NR 30 TC 183 Z9 192 U1 2 U2 17 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD OCT PY 1992 VL 100 IS 2 BP 565 EP 575 DI 10.1104/pp.100.2.565 PG 11 WC Plant Sciences SC Plant Sciences GA JT860 UT WOS:A1992JT86000005 PM 16653030 ER PT J AU SAUTER, M KENDE, H AF SAUTER, M KENDE, H TI GIBBERELLIN-INDUCED GROWTH AND REGULATION OF THE CELL-DIVISION CYCLE IN DEEP-WATER RICE SO PLANTA LA English DT Article DE CELL DIVISION CYCLE; FLOW CYTOMETRY; GIBBERELLIN; INTERCALARY MERISTEM; INTERNODAL ELONGATION; ORYZA (GROWTH) ID DEEP-WATER RICE; HIGHER-PLANTS; SUBMERGENCE; ELONGATION; PATTERNS; ETHYLENE AB Excised stem sections of deepwater rice (Oryza sativa L., cv. Pin Gaew 56) containing the highest internode were used to study induction of rapid internodal elongation by gibberellin. It has been shown previously that this growth response is based on an increased cell production rate in the intercalary meristem and on increased cell elongation. Our investigations were aimed at establishing the temporal sequence of these GA-regulated processes. Cell sizes were determined by scanning electron microscopy, the phases of the cell cycle by flow cytometry, and DNA synthesis by [H-3]thymidine incorporation. The lag time for the onset of gibberellic acid (GA3)-induced growth was 40 min. Treatment with GA3 promoted cell elongation in the intercalary meristem within 2 h. After 4 h of treatment with GA3. the fraction of meristematic cells in the G2 phase had declined, indicating that cells in the G2 phase had entered mitosis. Subsequent activation of DNA replication led to an overall increase in the cell-production rate. This was evident from an increase in the percentage of cells in the S phase and from enhanced incorporation of [H-3]thymidine into DNA between 4 and 7 h of GA3 treatment. An increase in the final cell length contributed to the growth response after 7 h of GA3 application. Our results are consistent with the hypothesis that gibberellin first promotes cell elongation in the intercalary meristem and that cell division is stimulated as a result of cell-growth. RP SAUTER, M (reprint author), MICHIGAN STATE UNIV,MICHIGAN STATE UNIV US DOE PLANT RES LAB,E LANSING,MI 48824, USA. NR 17 TC 74 Z9 81 U1 3 U2 14 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0032-0935 J9 PLANTA JI Planta PD OCT PY 1992 VL 188 IS 3 BP 362 EP 368 PG 7 WC Plant Sciences SC Plant Sciences GA JQ780 UT WOS:A1992JQ78000011 PM 24178326 ER PT J AU SHELLY, K FEAKES, DA HAWTHORNE, MF SCHMIDT, PG KRISCH, TA BAUER, WF AF SHELLY, K FEAKES, DA HAWTHORNE, MF SCHMIDT, PG KRISCH, TA BAUER, WF TI MODEL STUDIES DIRECTED TOWARD THE BORON NEUTRON-CAPTURE THERAPY OF CANCER - BORON DELIVERY TO MURINE TUMORS WITH LIPOSOMES SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE VESICLES ID PHOSPHOLIPID-VESICLES; MELANOMA; BIODISTRIBUTION; MICE AB The successful treatment of cancer by boron neutron-capture therapy (BNCT) requires the selective concentration of boron-10 within malignant tumors. The potential of liposomes to deliver boron-rich compounds to tumors has been assessed by the examination of the biodistribution of boron delivered by liposomes in tumor-bearing mice. Small unilamellar vesicles with mean diameters of 70 nm or less, composed of a pure synthetic phospholipid (distearoyl phosphatidylcholine) and cholesterol, have been found to stably encapsulate high concentrations of water-soluble ionic boron compounds. The hydrolytically stable borane anions B10H102-, B12H11SH2-, B20H17OH4-, B20H193-, and the normal form and photoisomer of B20H182- were encapsulated in liposomes as their soluble sodium salts. The tissue concentration of boron in tumor-bearing mice was measured at several time points over 48 h after i.v. injection of emulsions of liposomes containing the borane anions. Although the boron compounds used do not exhibit an affinity for tumors and are normally rapidly cleared from the body, liposomes were observed to selectively deliver the borane anions to tumors. The highest tumor concentrations achieved reached the therapeutic range (>15 mug of boron per g of tumor) while maintaining high tumor-boron/blood-boron ratios (>3). The most favorable results were obtained with the two isomers of B20H182-. These boron compounds have the capability to react with intracellular components after they have been deposited within tumor cells by the liposome, thereby preventing the borane ion from being released into blood. C1 UNIV CALIF LOS ANGELES,DEPT CHEM & BIOCHEM,LOS ANGELES,CA 90024. IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. VESTAR INC,SAN DIMAS,CA 91773. RI Bauer, William/B-8357-2016 OI Bauer, William/0000-0002-7190-9700 NR 35 TC 115 Z9 116 U1 0 U2 9 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD OCT 1 PY 1992 VL 89 IS 19 BP 9039 EP 9043 DI 10.1073/pnas.89.19.9039 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JQ934 UT WOS:A1992JQ93400038 PM 1409600 ER PT J AU PETERSEN, OW RONNOVJESSEN, L HOWLETT, AR BISSELL, MJ AF PETERSEN, OW RONNOVJESSEN, L HOWLETT, AR BISSELL, MJ TI INTERACTION WITH BASEMENT-MEMBRANE SERVES TO RAPIDLY DISTINGUISH GROWTH AND DIFFERENTIATION PATTERN OF NORMAL AND MALIGNANT HUMAN BREAST EPITHELIAL-CELLS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE EXTRACELLULAR MATRIX; RAPID TRANSFORMATION ASSAY; BREAST CANCER; TISSUE STRUCTURE AND FUNCTION ID CHEMICALLY DEFINED MEDIUM; CASEIN GENE-EXPRESSION; HUMAN MAMMARY-GLAND; EXTRACELLULAR-MATRIX; ALVEOLAR MORPHOGENESIS; TUMOR-CELLS; LINES; INVITRO; CULTURE; TRANSFORMATION AB Normal human breast epithelial cells show a high degree of phenotypic plasticity in monolayer culture and express many traits that otherwise characterize tumor cells in vivo. Paradoxically, primary human breast carcinoma cells are difficult to establish in culture: most outgrowths arise from the normal tissue surrounding the tumor. These characteristics have posed major obstacles to the establishment of simple reliable criteria for mammary epithelial transformation in culture. In the present study, we show that a reconstituted basement membrane (BM) can be used to culture all normal human breast epithelial cells and a subset of human breast carcinoma cells. The two cell types can be readily distinguished by virtue of the ability of normal cells to reexpress a structurally and functionally differentiated phenotype within BM. Twelve specimens of normal breast tissue and 2 normal breast epithelial cell lines (total 14 samples) embedded in BM as single cells were able to form multicellular spherical colonies with a final size close to that of true acini in situ. Sections of mature spheres revealed a central lumen surrounded by polarized luminal epithelial cells expressing keratins 18 and 19 and sialomucin at the apical membrane. Significantly, two-thirds of normal spheres deposited a visible endogenous type IV collagen-containing BM even though they were in contact with exogenously provided BM. Growth was arrested completely within the same time period. In contrast, none of 6 carcinoma cell lines or 2 cultures of carcinoma from fresh samples (total 8 samples) responded to BM by growth regulation, lumen formation, correct polarity, or deposition of endogenous BM. These findings may provide the basis of a rapid assay for discriminating normal human breast epithelial cells from their malignant counterparts. Furthermore, we propose that the ability to sense BM appropriately and to form three-dimensional organotypic structures may be the function of a class of "suppressor" genes that are lost as cells become malignant. C1 FIBIGER INST,DEPT TUMOR ENDOCRINOL,DK-2100 COPENHAGEN 0,DENMARK. LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. RP PETERSEN, OW (reprint author), UNIV COPENHAGEN,PANUM INST,DEPT ANAT A,STRUCT CELL BIOL UNIT,DK-2200 COPENHAGEN,DENMARK. RI Ronnov-Jessen OR Ronnovjessen, Lone/A-5981-2013 NR 49 TC 596 Z9 603 U1 4 U2 37 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD OCT 1 PY 1992 VL 89 IS 19 BP 9064 EP 9068 DI 10.1073/pnas.89.19.9064 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JQ934 UT WOS:A1992JQ93400043 PM 1384042 ER PT J AU ZETTL, KS SJAASTAD, MD RISKIN, PM PARRY, G MACHEN, TE FIRESTONE, GL AF ZETTL, KS SJAASTAD, MD RISKIN, PM PARRY, G MACHEN, TE FIRESTONE, GL TI GLUCOCORTICOID-INDUCED FORMATION OF TIGHT JUNCTIONS IN MOUSE MAMMARY EPITHELIAL-CELLS INVITRO SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE LACTOGENIC HORMONES; TRANSEPITHELIAL ELECTRICAL RESISTANCE; MAMMARY EPITHELIA ID CANINE KIDNEY-CELLS; PROTEIN-SYNTHESIS; TUMOR-CELLS; 2 STRAINS; WILD-TYPE; PERMEABILITY; MORPHOGENESIS; SUPPRESSION; MONOLAYERS; RESISTANCE AB Phenotypically stable cultures of untransformed mouse mammary epithelial cells (denoted 31EG4) were established and utilized to investigate the lactogenic hormone (glucocorticoids, insulin, and prolactin) regulation of tight junction formation. When 31EG4 cells were grown on permeable supports for 4 days in medium containing the synthetic glucocorticoid dexamethasone and insulin, confluent cell monolayers obtained a transepithelial electrical resistance (TER) of 1000-3000 OMEGA.cm2. In contrast, over the same time period, confluent monolayers treated with insulin or insulin and prolactin maintained a low TER (35-150 OMEGA.cm2). Consistent with the formation of tight junctions, apical to basolateral paracellular permeability was decreased from 12 % to 1 % for [C-14]mannitol and 3.3 % to 0.3 % for [H-3]inulin when cells were cultured in dexamethasone. This effect of dexamethasone on TER required extracellular calcium, de novo protein synthesis, dose-dependently correlated with glucocorticoid receptor occupancy, and was not due to an increase in cell density. As shown by direct and indirect immunofluorescence microscopy, dexamethasone treatment did not modulate the production or location of filamentous actin, the tight junction protein ZO-1, or the cell adhesion protein E-cadherin. Our results suggest that glucocorticoids play a fundamental role in the function and maintenance of cell-cell contact in the mammary epithelia by inducing the formation of tight junctions. C1 UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,CANC RES LAB,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. FU NCI NIH HHS [CA-05388]; NIDDK NIH HHS [DK-19520, DK-42799] NR 31 TC 107 Z9 110 U1 0 U2 0 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD OCT 1 PY 1992 VL 89 IS 19 BP 9069 EP 9073 DI 10.1073/pnas.89.19.9069 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JQ934 UT WOS:A1992JQ93400044 PM 1409603 ER PT J AU HUNDLE, BS OBRIEN, DA ALBERTI, M BEYER, P HEARST, JE AF HUNDLE, BS OBRIEN, DA ALBERTI, M BEYER, P HEARST, JE TI FUNCTIONAL EXPRESSION OF ZEAXANTHIN GLUCOSYLTRANSFERASE FROM ERWINIA-HERBICOLA AND A PROPOSED URIDINE-DIPHOSPHATE BINDING-SITE SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE CAROTENOID; ZEAXANTHIN DIGLUCOSIDE; UDP-GLUCOSE ID UDP-GLUCURONOSYLTRANSFERASE; GLUCOSYL TRANSFERASE; ESCHERICHIA-COLI; SEQUENCE; PURIFICATION; POLYMERASE; CLONING; PROTEIN; CDNA AB Erwinia herbicola, a nonphotosynthetic bacterium, is yellow colored due to the accumulation of unusually polar carotenoids, primarily mono- and diglucosides of zeaxanthin. We have cloned and expressed the gene for the enzyme that catalyzes the glucosylation of zeaxanthin. The enzyme has an apparent molecular mass of 45 kDa on an SDS/polyacrylamide gel, which is consistent with its calculated molecular mass. In vitro enzymatic activity was demonstrated using UDP-[C-14]glucose and zeaxanthin as substrates. The product zeaxanthin diglucoside and its intermediate monoglucoside were identified by thin layer chromatography. The optimum pH and temperature ranges of the enzyme are 7.0-7.5 and 32-37-degrees-C, respectively. A hydropathy plot indicates no apparent membrane-spanning regions, and biochemical experiments suggest that the enzyme is weakly membrane-associated. The amino acid sequence derived from the zeaxanthin glucosyltransferase gene shows a small region of high similarity with other glucuronosyl- and glucosyltransferases that use either UDP-activated glucuronic acid or a sugar as one of their substrates. Based on these similarities, we propose that this conserved sequence is part of the UDP binding site. C1 FREIBURG GERMANY INST BIOL 2,INST BIOL,W-7800 FREIBURG,GERMANY. LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720. RP HEARST, JE (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. FU NIEHS NIH HHS [2 T32 ES07075-11] NR 26 TC 70 Z9 73 U1 1 U2 2 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD OCT 1 PY 1992 VL 89 IS 19 BP 9321 EP 9325 DI 10.1073/pnas.89.19.9321 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JQ934 UT WOS:A1992JQ93400096 PM 1409639 ER PT J AU ARNOLD, GE ORNSTEIN, RL AF ARNOLD, GE ORNSTEIN, RL TI A MOLECULAR-DYNAMICS SIMULATION OF BACTERIOPHAGE-T4 LYSOZYME SO PROTEIN ENGINEERING LA English DT Article DE COMPUTER SIMULATION; PROTEIN DYNAMICS; PROTEIN MOTIONS; T4 LYSOZYME ID L7/L12 RIBOSOMAL-PROTEIN; C-TERMINAL FRAGMENT; CONFORMATIONS; BINDING; CRYSTAL; MOTION AB An analysis of a 400 ps molecular dynamics simulation of the 164 amino acid enzyme T4 lysozyme is presented. The simulation was carried out with all hydrogen atoms modeled explicitly, the inclusion of all 152 crystallographic waters and at a temperature of 300 K. Temporal analysis of the trajectory versus energy, hydrogen bond stability, r.m.s. deviation from the starting crystal structure and radius of gyration, demonstrates that the simulation was both stable and representative of the average experimental structure. Average structural properties were calculated from the enzyme trajectory and compared with the crystal structure. The mean value of the Calpha displacements of the average simulated structure from the X-ray structure was 1.1 +/- 0.1 angstrom; differences of the backbone PHI and PSI angles between the average simulated structure and the crystal structure were also examined. Thermal-B factors were calculated from the simulation for heavy and backbone atoms and both were in good agreement with experimental values. Relationships between protein secondary structure elements and internal motions were studied by examining the positional fluctuations of individual helix, sheet and turn structures. The structural integrity in the secondary structure units was preserved throughout the simulation; however, the A helix did show some unusually high atomic fluctuations. The largest backbone atom r.m.s. fluctuations were found in non-secondary structure regions; similar results were observed for r.m.s. fluctuations of non-secondary structure PHI and PSI angles. In general, the calculated values of r.m.s. fluctuations were quite small for the secondary structure elements. In contrast, surface loops and turns exhibited much larger values, being able to sample larger regions of conformational space. The Calpha difference distance matrix and super-positioning analyses comparing the X-ray structure with the average dynamics structure suggest that a 'hinge-bending' motion occurs between the N- and C-terminal domains. C1 PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 34 TC 13 Z9 13 U1 1 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 OCT PY 1992 VL 5 IS 7 BP 703 EP 714 DI 10.1093/protein/5.7.703 PG 12 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA JY143 UT WOS:A1992JY14300013 PM 1480623 ER PT J AU CHUANG, SSC SOONG, Y NOCETI, RP SCHEHL, RR AF CHUANG, SSC SOONG, Y NOCETI, RP SCHEHL, RR TI CHARACTERIZATION OF CU-RH/SIO2 BY TEMPERATURE-PROGRAMMED DESORPTION (TPD) OF HYDROGEN SO REACTION KINETICS AND CATALYSIS LETTERS LA English DT Article ID CATALYSTS; SELECTIVITY AB The presence of Cu on Rh/SiO2 inhibited H-2 chemisorption at 303 K and suppressed CO hydrogenation. TPD study shows that chemisorption of H-2 on Cu-Rh/SiO2 is an activated process at 303 K. C1 US DOE,PITTSBURGH ENERGY TECHNOL CTR,PITTSBURGH,PA 15236. RP CHUANG, SSC (reprint author), UNIV AKRON,DEPT CHEM ENGN,AKRON,OH 44325, USA. NR 13 TC 3 Z9 3 U1 2 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0133-1736 J9 REACT KINET CATAL L JI React. Kinet. Catal. Lett. PD OCT PY 1992 VL 48 IS 1 BP 31 EP 36 DI 10.1007/BF02070063 PG 6 WC Chemistry, Physical SC Chemistry GA KL439 UT WOS:A1992KL43900005 ER PT J AU MONTGOMERY, DS LERCHE, RA LAUMANN, CW WIEDWALD, JD DRAKE, RP AF MONTGOMERY, DS LERCHE, RA LAUMANN, CW WIEDWALD, JD DRAKE, RP TI EVALUATING THE ACCURACY OF OPTICAL-STREAK-CAMERA SWEEP RATES USING UNCERTAIN DATA SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB A number of optical streak cameras are routinely operated for experiments at the Lawrence Livermore National Laboratory Nova laser facility. We report results from a study of the accuracy and reproducibility of the sweep rate. The sweep rates, measured using a 3 GHz pulse generator, vary by +/-1.3% rms for data collected routinely over a several month period. Using statistical analysis, we develop an analytic model describing the effect of noise on our measurement technique in order to estimate the actual variation in the sweep rate. Numerical simulations of the effect of noise on the uncertainty of our measurement technique show close agreement with the model. By applying this model, we estimate that the sweep rate is reproducible to at least +/-1.2%, and that the measurement technique contributes +/- 0.5% uncertainty. Other data are presented which support this estimate. C1 UNIV CALIF DAVIS,DAVIS,CA 95616. RP MONTGOMERY, DS (reprint author), LAWRENCE LIVERMORE NATL LAB,PLASMA PHYS RES INST,6-473,POB 5508,LIVERMORE,CA 94551, USA. RI Drake, R Paul/I-9218-2012; OI Drake, R Paul/0000-0002-5450-9844; Montgomery, David/0000-0002-2355-6242 NR 11 TC 9 Z9 15 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 OCT PY 1992 VL 63 IS 10 BP 4322 EP 4326 DI 10.1063/1.1143731 PN 1 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV132 UT WOS:A1992JV13200010 ER PT J AU BENSADOUN, M WITEBSKY, C SMOOT, G DEAMICI, G KOGUT, A LEVIN, S AF BENSADOUN, M WITEBSKY, C SMOOT, G DEAMICI, G KOGUT, A LEVIN, S TI A LIQUID-HELIUM-COOLED ABSOLUTE REFERENCE COLD LOAD FOR LONG-WAVELENGTH RADIOMETRIC CALIBRATION SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID COSMIC BACKGROUND-RADIATION; 12 CENTIMETER WAVELENGTH; SOUTH CELESTIAL POLE; BRIGHTNESS TEMPERATURE; 3.8 GHZ; FREQUENCY AB We describe a large (78 cm) diameter liquid-helium-cooled blackbody absolute reference cold load for the calibration of microwave radiometers. The load provides an absolute calibration near the liquid-helium (LHe) boiling point, with total uncertainty in the radiometric temperature of less than 30 mK over the 2.5-23-cm wavelength (12-1.3 GHz) operating range. Emission from those parts of the cold load not immersed in LHe is less-than-or-equal-to 25 mK and the reflection coefficient is less-than-or-equal-to 3.5X10(-4). This cold load has been used at several wavelengths at the South Pole, Antarctica and at the White Mountain Research Station, California to calibrate spectral measurements of the cosmic microwave background radiation. For the instruments operated at 20-, 12-, 7.9-, and 4.0-cm wavelength at the South Pole, the total corrections to the LHe boiling-point temperature (approximately 3.8 K) were 48+/-23, 18+/-10, 10+/-18, and 15+/-16 mK, respectively. In operation, the average LHe loss rate was less-than-or-equal-to 4.4 l/h, allowing day-long periods of operation without a LHe fill. The boiloff rate is not strongly dependent on the radiative load at the aperture, yielding very stable operation and radiometric performance. Design considerations, radiometric and thermal performance, and operational aspects are discussed. A comparison with other LHe-cooled reference loads including the predecessor of this cold load is given. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP BENSADOUN, M (reprint author), UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720, USA. NR 29 TC 9 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4377 EP 4389 DI 10.1063/1.1143738 PN 1 PG 13 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV132 UT WOS:A1992JV13200018 ER PT J AU BOIVIN, RL LIN, Z ROQUEMORE, AL ZWEBEN, SJ AF BOIVIN, RL LIN, Z ROQUEMORE, AL ZWEBEN, SJ TI CALIBRATION OF THE TFTR LOST ALPHA-DIAGNOSTIC SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID FUSION PRODUCTS; TRITONS AB We present various aspects of the calibration of the TFTR lost alpha diagnostic. The diagnostic consists of four detectors, forming a poloidal array at the bottom of TFTR inside the vacuum vessel. The detector is composed of a ZnS(Ag) scintillator and a pair of collimating apertures which permit pitch angle, energy, and time resolution of the escaping flux of high-energy ions (MeV range). The first goal of this study was to establish the absolute calibration of the diagnostic for different particle types and energies. This enables us to compare for the first time, measured losses with loss calculations based on a first-orbit model. However, the factor of 2 uncertainty in the final calibration is still too large for full, quantitative comparisons of the data with the theory based on absolute flux measurements alone. We also present some of the aspects related to the detector's resolution capabilities, its temperature dependence, and its time response. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543. RP BOIVIN, RL (reprint author), MIT,CTR PLASMA FUS,175 ALBANY ST,CAMBRIDGE,MA 02139, USA. NR 25 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4418 EP 4426 DI 10.1063/1.1143690 PN 1 PG 9 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV132 UT WOS:A1992JV13200023 ER PT J AU SPEAR, JD RUSSO, RE ANDREWS, JE GRANT, PM AF SPEAR, JD RUSSO, RE ANDREWS, JE GRANT, PM TI LENS CORRECTION FOR THE IMPLEMENTATION OF CYLINDRICAL VESSELS IN A SPECTROPHOTOMETER SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Note AB A simple optical correction system for allowing cylindrical vials to be used as sample vessels in a spectrophotometer is described. Light within the spectrophotometer enters and exits the liquid samples through the curved glass wall of the vials. Absorption spectra can be obtained conveniently without the need for solution transfer into standard rectangular spectrophotometer cuvettes. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP SPEAR, JD (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 3 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4457 EP 4458 DI 10.1063/1.1143697 PN 1 PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV132 UT WOS:A1992JV13200030 ER PT J AU LUPPOV, VG ROSER, T AF LUPPOV, VG ROSER, T TI SPONTANEOUS NUCLEAR-POLARIZATION OF ATOMIC-HYDROGEN AT LOW MAGNETIC-FIELD SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Note ID RELAXATION; RECOMBINATION AB The known spin-exchange rates of atomic hydrogen lead to fast spontaneous buildup of high nuclear polarization at low magnetic field. We propose to use the nuclear polarized atomic hydrogen gas to produce an intense ultracold nuclear polarized beam of atomic hydrogen. C1 UNIV MICHIGAN,RANDALL LAB PHYS,ANN ARBOR,MI 48109. JOINT NUCL RES INST,HIGH ENERGY LAB,MOSCOW,USSR. BROOKHAVEN NATL LAB,DEPT AGS,UPTON,NY 11973. NR 8 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4465 EP 4466 DI 10.1063/1.1143701 PN 1 PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV132 UT WOS:A1992JV13200034 ER PT J AU FISHER, RK MCCHESNEY, JM HOWALD, AW PARKS, PB SNIPES, JA TERRY, JL MARMAR, ES ZWEBEN, SJ MEDLEY, SS AF FISHER, RK MCCHESNEY, JM HOWALD, AW PARKS, PB SNIPES, JA TERRY, JL MARMAR, ES ZWEBEN, SJ MEDLEY, SS TI ALPHA-PARTICLE DIAGNOSTICS USING IMPURITY PELLET INJECTION (INVITED) SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB We have proposed using impurity pellet injection to measure the energy distribution of the confined alpha particles in a reacting plasma [R. K. Fisher et al., Fusion Technol. 13, 536 (1988)]. The ablation cloud surrounding the injected pellet is thick enough that an equilibrium fraction F0infinity (E) of the incident alphas should be neutralized as they pass through the cloud. By observing neutrals created in the large spatial region of the cloud which is expected to be dominated by the heliumlike ionization state, e.g., Li+ ions, we can determine the incident alpha distribution dn(He-2+)/dE from the measured energy distribution of neutral helium atoms dn(He-0)/dE using dn(He-0)/dE = dn(He-2+)/dE.F0infinity (E,Li+). Initial experiments were performed on the Texas Experimental Tokamak (TEXT) in which we compared pellet penetration with our impurity pellet ablation model [P. B. Parks et al., Nucl. Fusion 28, 477 (1988)], and measured the spatial distribution of various ionization states in carbon pellet clouds [R. K. Fisher et al., Rev. Sci. Instrum. 61, 3196 (1990)]. Experiments have recently begun on the Tokamak Fusion Test Reactor (TFTR) with the goal of measuring the alpha particle energy distribution during D-T operation in 1993-94. A series of preliminary experiments are planned to test the diagnostic concept. The first experiments will observe neutrals from beam-injected deuterium ions and the high energy He-3 tail produced during ion cyclotron (ICH) minority heating on TFTR interacting with the cloud. We will also monitor by line radiation the charge state distributions in lithium, boron, and carbon clouds. Later experiments are planned to measure the energy distribution of the 3.7 MeV alphas created by He-3-D reactions during ICH minority heating. Observations of 3.7 MeV alphas should allow single-particle alpha physics to be studied now and result in a fully tested diagnostic prior to D-T operation of TFTR. C1 MIT,CAMBRIDGE,MA 02139. PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. RP FISHER, RK (reprint author), GEN ATOM,POB 85608,SAN DIEGO,CA 92186, USA. NR 20 TC 20 Z9 20 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4499 EP 4504 DI 10.1063/1.1143705 PN 2 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300001 ER PT J AU CONNOR, KA ZIELINSKI, JJ SCHWELBERGER, JG ACETO, SC GLOWIENKA, JC CARNEVALI, A AF CONNOR, KA ZIELINSKI, JJ SCHWELBERGER, JG ACETO, SC GLOWIENKA, JC CARNEVALI, A TI THE ATF HEAVY-ION BEAM PROBE (INVITED) SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB A heavy ion beam probe (HIBP) has been implemented on the ATF torsatron at oak ridge National Laboratory with the primary goal of providing direct measurements of the plasma potential radial profile and thus of the radial electric field. The complex ATF geometry and magnetic field structure presented a diagnostic environment more challenging than that found on previous beam probe systems. Particular attention has therefore been given to in situ system alignment and control capabilities. Measurements of electric potential profiles, electron density profiles, electron density fluctuations, and electric potential fluctuations have now been made with this system. Most of the data obtained were for ECH heated discharges, but we were also able to make measurements of a few NBI heated plasmas. In addition to our calibration techniques, we were able to establish a reasonable confidence level for the data obtained since we could identify the most important potential profile characteristics predicted by theory and to corroborate our measurements with information from other diagnostics. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV N ALABAMA,FLORENCE,AL 35632. RP CONNOR, KA (reprint author), RENSSELAER POLYTECH INST,TROY,NY 12180, USA. NR 13 TC 11 Z9 11 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 OCT PY 1992 VL 63 IS 10 BP 4505 EP 4510 DI 10.1063/1.1143706 PN 2 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300002 ER PT J AU JOHNSON, LC AF JOHNSON, LC TI VALIDATION OF SPATIAL PROFILE MEASUREMENTS OF NEUTRON EMISSION IN TFTR PLASMAS (INVITED) SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB The TFTR multichannel neutron collimator provides spatially localized information on nuclear reaction rates in fusion plasmas. Absolutely calibrated NE 451 ZnS scintillators detect chord-integrated neutron emission along ten vertical sightlines, which are defined by a massive shielding structure in the facility basement. If such observations are to be of value, virgin neutrons along each sightline must be distinguishable from a background of gamma rays and scattered neutrons, and the measurements must be sufficiently precise, over a wide range of plasma conditions, to allow meaningful comparison with results of transport analysis computer codes. As a useful check, the volume-integrated neutron emission must agree with independent measurements of the global neutron source strength. Although NE 451 detectors are insensitive to gamma rays and to neutrons with energy less than approximately 2 MeV, the scintillation pulse height distribution depends on both the incident neutron energy spectrum and the physical parameters of the individual detector. In order to establish the validity of our measurements, we have carried out a detailed characterization of our detectors, including computer modeling of scintillation pulse height spectra and of temporal pulse pileup effects in the counting circuitry. Satisfactory operation of the system has been demonstrated for all deuterium plasmas encountered in TFTR. The detector modeling, together with further laboratory measurements, will enable us to re are for deuterium-tritium experiments. RP JOHNSON, LC (reprint author), PRINCETON UNIV, PLASMA PHYS LAB, PRINCETON, NJ 08543 USA. NR 18 TC 24 Z9 24 U1 0 U2 3 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4517 EP 4522 DI 10.1063/1.1143708 PN 2 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300004 ER PT J AU KAMPERSCHROER, JH GRISHAM, LR KUGEL, HW OCONNOR, TE NEWMAN, RA STEVENSON, TN VONHALLE, A WILLIAMS, MD AF KAMPERSCHROER, JH GRISHAM, LR KUGEL, HW OCONNOR, TE NEWMAN, RA STEVENSON, TN VONHALLE, A WILLIAMS, MD TI PARTICLE REFLECTION AND TFTR NEUTRAL BEAM DIAGNOSTICS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB Determination of two critical neutral beam parameters, power and divergence, are affected by the reflection of a fraction of the incident energy from the surface of the measuring calorimeter. On the TFTR Neutral Beam Test Stand, greater than 30% of the incident power directed at the target chamber calorimeter was unaccounted for. Most of this loss is believed due to reflection from the surface of the flat calorimeter, which was struck at a near grazing incidence (12-degrees). Beamline calorimeters, of a "V"-shape design, while retaining the beam power, also suffer from reflection effects. Reflection, in this latter case, artificially peaks the power toward the apex of the "V," complicating the fitting technique, and increasing the power density on axis by 10%-20%; an effect of import to future beamline designers. Agreement is found between measured and expected divergence values, even with 24% of the incident energy reflected. RP KAMPERSCHROER, JH (reprint author), PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 13 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4523 EP 4526 DI 10.1063/1.1143709 PN 2 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300005 ER PT J AU MCCAULEY, JS STRACHAN, JD AF MCCAULEY, JS STRACHAN, JD TI MEASUREMENT OF DT NEUTRON EMISSION FROM TFTR WITH HE-4 PROPORTIONAL RECOIL COUNTERS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB The DT neutron emission from Triton Burnup has been measured with four helium-4 proportional counters in TFTR's Multichannel Neutron Collimator. The operating characteristics of an "alpha" recoil proportional counter are presented. The theoretical response function of these detectors, which is complicated by the strong anisotropy of the (n,alpha) reaction, is compared with the measured response of these detectors from TFTR. A computer simulation predicts wall and end effects. The frequency responses of the detector and electronics have also been tested. A model predicts the saturation effects seen during high-power plasmas. The calibration techniques for this detector array will be discussed. The detectors have been used to measure the radial profile of the 1 MeV tritons produced by the d(dp)t fusion reaction. The burnup produces 14 MeV neutrons in the d(t,n)alpha fusion reaction. RP MCCAULEY, JS (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 9 TC 9 Z9 9 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4536 EP 4538 DI 10.1063/1.1143712 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300009 ER PT J AU ROQUEMORE, AL JOHNSON, LC AF ROQUEMORE, AL JOHNSON, LC TI CONTROL OF THE NEUTRON DETECTOR COUNT RATE BY OPTICAL IMAGING SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB The signal processing electronics used for the NE451 detectors on the TFTR multichannel neutron collimator are presently showing saturation effects at high counting rates equivalent to neutron yields of approximately 10(16) n/s. While nonlinearity due to pulse pileup can be corrected for in most present TFTR experiments, additional steps are required for neutron source strengths above approximately 3 X 10(16) n/s. These pulse pileup effects could be reduced by inserting sleeves in the collimator shielding to reduce the neutron flux in the vicinity of the detectors or by reducing the volume of detector exposed to the flux. We describe a novel method of avoiding saturation by optically controlling the number neutron events processed by the detector electronics. Because of the optical opacity of the ZnS-plastic detectors such as NE451, photons from a proton-recoil scintillation arise from a spatially localized area of the detector. By imaging a selected portion of the detector onto a photomultiplier, we reduce the effective volume of the detector in a controllable, reversible way. A prototype system, consisting of a focusing lens, a field lens, and a variable aperture, has been constructed. Results of laboratory feasibility tests are presented. RP ROQUEMORE, AL (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08544, USA. NR 4 TC 1 Z9 1 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4539 EP 4541 DI 10.1063/1.1143713 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300010 ER PT J AU TUSZEWSKI, M ZWEBEN, SJ AF TUSZEWSKI, M ZWEBEN, SJ TI CALIBRATION OF SCINTILLATION DETECTORS FOR MEV CHARGED FUSION PRODUCTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB The light output of ZnS scintillators used to detect escaping fusion products in the TFTR Tokamak is studied with 3.5-MeV alpha and 3-MeV proton beams. The emitted light first increases linearly with beam current and then saturates. In all cases investigated, the saturations start at a fairly constant absorbed power density of about 1 mW/cm2. The scintillators have adequate time response up to 50-100 kHz. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544. RP TUSZEWSKI, M (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 4 TC 8 Z9 10 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4542 EP 4544 DI 10.1063/1.1143714 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300011 ER PT J AU DARROW, DS BOIVIN, RL ZWEBEN, SJ AF DARROW, DS BOIVIN, RL ZWEBEN, SJ TI EXTENSION OF THE ENERGY-RANGE OF THE MOVABLE FAST ION PROBE ON TFTR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB The range of detectable energies of the moveable fast ion probe on TFTR has been extended by the removal of a 3-mum Al foil across its entrance aperture. This foil formerly stopped hydrogenic ions with energies below 300 keV, and helium ions with energies below 900 keV. The new arrangement allows detection of neutral beam ions (100-keV D+) at toroidal fields between 1 and 5 T. Data typical of the probe's enhanced performance are shown. RP DARROW, DS (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 6 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4562 EP 4564 DI 10.1063/1.1143668 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300017 ER PT J AU ZWEBEN, SJ BOIVIN, R DARROW, D LOESSER, D MEDLEY, SS MCSMITH, M OWENS, DK ULRICKSON, M AF ZWEBEN, SJ BOIVIN, R DARROW, D LOESSER, D MEDLEY, SS MCSMITH, M OWENS, DK ULRICKSON, M TI OPERATING EXPERIENCES WITH THE TFTR ESCAPING ALPHA-DETECTORS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID FUSION PRODUCTS AB This paper reviews the operating experiences obtained with a set of scintillator-based escaping fast ion detectors which have been used successfully for several years on the TFTR tokamak. There have been several operational problems which need to be resolved before these detectors are used to measure 3.5 MeV DT alphas in 1993. The main problem has been overheating by edge plasma heat flux for large major radius plasmas, when the detectors were not shadowed by the adjacent limiter. Other problems have been due to runaway electron-induced x-ray flux and scintillator and foil damage. RP ZWEBEN, SJ (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 12 TC 11 Z9 11 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4565 EP 4567 DI 10.1063/1.1143669 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300018 ER PT J AU SCHWELBERGER, JG ACETO, SC CONNOR, KA ZIELINSKI, JJ BAYLOR, LA ENGLAND, AC ISLER, R MA, CH MURAKAMI, M UCKAN, T RASMUSSEN, DA AF SCHWELBERGER, JG ACETO, SC CONNOR, KA ZIELINSKI, JJ BAYLOR, LA ENGLAND, AC ISLER, R MA, CH MURAKAMI, M UCKAN, T RASMUSSEN, DA TI ELECTRON-DENSITY PROFILE MEASUREMENT WITH A HEAVY-ION BEAM PROBE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB The feasibility of electron density profile measurements using a heavy ion beam probe in high-temperature plasmas has been demonstrated earlier [J. Schwelberger et al., Bull. Am. Phys. Soc. 36, 2292 (1991); Yu. N. Dnestrovskij et al., Sov. J. Plasma Phys. 12, 130 (1986)]. Two algorithms were developed to obtain density profiles from the heavy ion beam probe on the Advanced Toroidal Facility (ATF). A comparison of the algorithms is presented with a detailed study of the errors involved in the measurements. The errors can be due to uncertainties in cross sections, electron temperature, the line average density measurement, and the ion trajectory calculations. The heavy ion beam probe density profile measurement is not very susceptible to errors as long as the electron temperature stays above 30 eV. If the electron temperature is below this value, a small uncertainty in the temperature introduces a large error in the density. Also, important for a good density profile measurement is the calculation of the correct ion trajectories. Examples of density profiles are shown for ECH plasmas on ATF together with a detailed error analysis. The heavy ion beam probe results are in good agreement with multichannel far-infrared laser interferometry and Thomson scattering results. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. RP SCHWELBERGER, JG (reprint author), RENSSELAER POLYTECH INST,TROY,NY 12180, USA. OI Isler, Ralph/0000-0002-5368-7200 NR 3 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4571 EP 4573 DI 10.1063/1.1143671 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300020 ER PT J AU ZIELINSKI, JJ ACETO, SC SCHWELBERGER, JG CONNOR, KA LEWIS, JF GLOWIENKA, JC CARNEVALI, A AF ZIELINSKI, JJ ACETO, SC SCHWELBERGER, JG CONNOR, KA LEWIS, JF GLOWIENKA, JC CARNEVALI, A TI INSITU ANALYZER CALIBRATION METHODS FOR HEAVY-ION BEAM PROBES INSTALLED ON STELLARATOR-LIKE DEVICES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB An absolute calibration of an installed heavy ion beam probe (HIBP) energy analyzer is possible by detecting secondary ions that come from a source at a known location that is maintained at a known potential. It is also necessary that the magnetic field that exists during the calibration be the same magnetic field that exists when a plasma is present. These conditions can be met on stellarators, heliotrons, and torsatrons, which produce their magnetic configurations with external coil sets. Since no internal plasma current is required, suitable sources for producing secondary ions by interaction with the primary beam can be placed inside the vacuum vessels of these devices at known locations. Secondary ions can be produced by the interaction of the primary beam with thin films, gas box probes, electron beams, or neutral gas filling the vacuum vessel. Details of a spherical mesh probe that combines the advantages of several of these methods are given. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV N ALABAMA,FLORENCE,AL 35632. RP ZIELINSKI, JJ (reprint author), RENSSELAER POLYTECH INST,TROY,NY 12180, USA. NR 13 TC 12 Z9 12 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 OCT PY 1992 VL 63 IS 10 BP 4574 EP 4577 DI 10.1063/1.1143672 PN 2 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300021 ER PT J AU CARRERAS, BA AF CARRERAS, BA TI DIAGNOSTIC NEEDS FOR FLUCTUATION AND TRANSPORT STUDIES (INVITED) SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID POLOIDAL FLOW GENERATION; DENSITY-FLUCTUATIONS; DRIVEN TURBULENCE; DIII-D; TOKAMAK; EDGE; PLASMAS; ECE; ATF AB The identification of fundamental transport mechanisms in magnetically confined plasmas is a critical issue for the magnetic fusion program. Recent progress in understanding fluctuations and transport is well correlated with the development and use of new diagnostics, but a great deal of information is still missing. Some of the required measurements are well beyond our present diagnostic capabilities, but some are within reach and could answer critical questions in this area of research. Some of these critical issues are discussed. RP OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. NR 60 TC 4 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0034-6748 EI 1089-7623 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4589 EP 4594 DI 10.1063/1.1143679 PN 2 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300025 ER PT J AU ZOLFAGHARI, AM LUCKHARDT, S WOSKOV, PP COHN, DR JONES, S KESNER, J MACHUZAK, J RAMOS, JJ BARTLETT, DV COSTLEY, AE CRIPWELL, P PORTE, L SMITH, RJ KAITA, R AF ZOLFAGHARI, AM LUCKHARDT, S WOSKOV, PP COHN, DR JONES, S KESNER, J MACHUZAK, J RAMOS, JJ BARTLETT, DV COSTLEY, AE CRIPWELL, P PORTE, L SMITH, RJ KAITA, R TI FAST ECE CORRELATION RADIOMETRY FOR FLUCTUATION MEASUREMENTS IN JET AND PBX-M SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB We discuss the fluctuation characteristics expected from MHD modes including ballooning modes and show how they can be studied using measurements of ECE. A novel technique, EC correlation radiometry, which enables the location and spatial structure of long wavelength (L > 0.1 X a) MHD modes to be determined, is described. Measurements on JET with a 44-channel ECE heterodyne radiometer are presented and show the existence of high-frequency (high n number) MHD modes under high poloidal beta, pellet-enhanced performance (PEP) plasma conditions. Similar measurements are planned for PBX-M and the measurement system is described. C1 JET JOINT UNDERTAKING,ABINGDON OX14 3EA,OXON,ENGLAND. PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544. RP ZOLFAGHARI, AM (reprint author), MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139, USA. NR 6 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4619 EP 4621 DI 10.1063/1.1143689 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300032 ER PT J AU YAMADA, M NAGAYAMA, Y DAVIS, W FREDRICKSON, E JANOS, A LEVINTON, F AF YAMADA, M NAGAYAMA, Y DAVIS, W FREDRICKSON, E JANOS, A LEVINTON, F TI DIAGNOSTICS FOR INVESTIGATION OF MAGNETIC RECONNECTION IN SAWTOOTH CRASH ON TFTR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID TOKAMAK AB Magnetic reconnection phenomena are documented by a set of noninvasive fast diagnostics during the crash phase of sawtooth oscillations. The electron cyclotron emission diagnostic system provides the highest resolution for measuring time evolution of electron temperature profile during a typical Tokamak Fusion Test Reactor fast sawtooth crash. The x-ray tomography also contains fast time scale information of the electron temperature profile and additionally the impurity concentration. Just before the crash, a shrinking circular hot peak and growing crescent-shaped flat island appear in the inside of the inversion radius on a bird's-eye view of the electron temperature profile. The electron temperature gradient inside the inversion radius diminishes to nearly zero after the crash. Concomitantly, q(r) profile [q(r) = local safety factor] is measured by the motional stark effect (MSE) diagnostics to verify a magnetic field line reconnection during the sawtooth oscillation. Initial MSE data indicate that central q values increases by 5%-10% during the sawtooth crash phase even when the pressure gradient diminishes inside the q = 1 region. C1 FUS PHYS & TECHNOL,TORRANCE,CA 90503. RP YAMADA, M (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. RI Yamada, Masaaki/D-7824-2015; OI Yamada, Masaaki/0000-0003-4996-1649; Davis, William/0000-0003-0666-7247 NR 13 TC 12 Z9 12 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4623 EP 4626 DI 10.1063/1.1143637 PN 2 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300033 ER PT J AU GREK, B BARTOLICK, J JOHNSON, D AF GREK, B BARTOLICK, J JOHNSON, D TI OBSERVATION OF DENSITY-FLUCTUATIONS FROM THE INFRARED BREMSSTRAHLUNG EMISSION ON TFTR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB The infrared emission of beam heated TFTR discharges is studied using the high collection efficiency TFTR Thompson scattering system. It is found that emission in the vicinity of 9800 angstrom can be used to study fluctuations in the bremsstrahlung emission. Low-frequency (< 40 kHz) fluctuations that are associated with MHD modes and high-frequency (> 200 kHz) bursts of fluctuations are observed. Both coherent and incoherent fluctuations exist. In some cases, the observed coherent fluctuations can be interpreted as being due to density fluctuations as high as 5%. The rms value of broadband density turbulence in the near central regions of the plasma is estimated to be about 1%. RP GREK, B (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. NR 4 TC 5 Z9 5 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4627 EP 4629 DI 10.1063/1.1143638 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300034 ER PT J AU HANSON, GR WILGEN, JB BIGELOW, TS COLLAZO, I THOMAS, CE AF HANSON, GR WILGEN, JB BIGELOW, TS COLLAZO, I THOMAS, CE TI A SWEPT 2-FREQUENCY MICROWAVE REFLECTOMETER FOR EDGE DENSITY PROFILE MEASUREMENTS ON TFTR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB The edge density profile can play a significant role in determining the plasma confinement and the coupling of the ion cyclotron resonance frequency (ICRF) heating power to the plasma. To experimentally measure the edge density profile in the Tokamak Fusion Test Facility (TFTR), a two-frequency microwave reflectometer is being built. This reflectometer will operate in a swept two-frequency configuration between 91 and 118 GHz using the extraordinary mode. The frequency separation between the two microwave signals will be held constant while the signals are swept across the frequency band. By measuring the differential phase delay between these two signals, the density profile can be reconstructed. Two-frequency profile reflectometry is discussed and results of modeling of this type of reflectometer measurement for TFTR are shown. Finally, the design of the TFTR edge profile reflectometer microwave system is described. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 2 TC 18 Z9 19 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4658 EP 4660 DI 10.1063/1.1143654 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300043 ER PT J AU KILKENNY, JD AF KILKENNY, JD TI RECENT DIAGNOSTIC DEVELOPMENTS AT NOVA SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID CONFINEMENT FUSION-TARGETS; LASER-PRODUCED PLASMAS; SPECTROSCOPY; SPECTROGRAPH; SCATTERING; CAMERAS AB The Nova laser at Lawrence Livermore National Laboratory has about 60 diagnostics in use on its two target chambers. The broad rationale for the diagnostics is explained. Recent developments in diagnostic techniques on Nova for implosions, soft x-ray studies, and x-ray laser applications are described. RP KILKENNY, JD (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 48 TC 34 Z9 35 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4688 EP 4694 DI 10.1063/1.1143610 PN 2 PG 7 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300052 ER PT J AU YOUNG, KM AF YOUNG, KM TI DIAGNOSTICS FOR ITER - A STATUS-REPORT SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID SPECTROSCOPY; TOKAMAK AB The protocol agreement allowing the design of the International Thermonuclear Engineering Reactor (ITER) to proceed will be signed early this year. There is already a small U.S. Program evaluating diagnostic capability for this device and there will shortly be an international effort on diagnostics to ensure satisfactory integration of the diagnostic systems with all the complex systems that will be developed for this large ignited tokamak. The diagnostic studies, at least initially, will depend heavily on the output information provided by the conceptual design activity (CDA). ITER provides a very large plasma (R = 6. 0 m, a = 2.15 m) with high average density ([n(e)] approximately 1.0 x 10(20) m-3), and temperatures ([T(e)] approximately [T(i)] greater-than-or-equal-to 10 keV). It is highly elongated and could have primarily noninductive current drive so that its pulse length can be very long (t less-than-or-equal-to 2 weeks) to allow significant blanket testing in its technology phase. These parameters lead to considering new diagnostic methods for some measurements. A set of specifications for the diagnostic measurements were developed, and a corresponding set of diagnostic instruments was proposed during the CDA. The specifications for spatial and temporal measurement of the plasma parameters are very similar to those achieved on present day large tokamaks, where, on the whole, the access to the plasma is much more open and there is a negligible radiation background in which the diagnostics have to perform. The specifications require that many diagnostic signals participate in the control of complex fuelling, heating, and current drive schemes, so it is clear that the diagnostic design issues for these burning plasmas must be addressed early in ITER's design life. This is particularly true because penetrations through the first wall are at a premium and only small holes can be tolerated because of radiation streaming. The needs for Research and Development, necessary to demonstrate the feasibility of diagnostic techniques for the ITER plasma parameters and the radiation environment were also addressed. In the area of radiation impact on diagnostic components, some priorities have been set and testing programs have been started. This report will address the present activities on diagnostics in the U.S. Program to address some of the problems left over from the CDA. RP YOUNG, KM (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 28 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4702 EP 4707 DI 10.1063/1.1143613 PN 2 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300054 ER PT J AU JANOS, AC FREDRICKSON, E MCGUIRE, KM NAGAYAMA, Y OWENS, DK AF JANOS, AC FREDRICKSON, E MCGUIRE, KM NAGAYAMA, Y OWENS, DK TI MEASUREMENT OF THE NONAXISYMMETRIC HEAT LOAD DISTRIBUTION ON THE 1ST WALL OF TFTR DUE TO LOCKED MODES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB The first wall of TFTR is covered in large part (23%) by an inner-wall bumper limiter which is the primary power handling structure in TFTR. The limiter is comprised of more than 2000 tiles, and is instrumented with a large number (> 100) of thermocouples in a two-dimensional (2D) array, primarily for protection of the wall. While only about 5% of the tiles are monitored, this thermocouple system is nevertheless capable of mapping details in the nonaxisymmetric, as well as symmetric, heat load patterns encountered under different conditions. In particular, helical heating patterns are observed in discharges which have locked modes. The helical patterns clearly match the expected trajectories based on the m/n mode numbers obtained from Mirnov coils (m/n = 2/1 and 4/1), so that the thermocouple system can and was used to identify the existence and mode number of a locked mode. While TFTR discharges rarely suffer from locked modes, locked modes always alter the heating pattern. The locked modes are found to very significantly redistribute the heat load for both ohmic and NBI heated discharges. Locked modes can make what were the coldest areas into the hottest areas, and vice versa. Locked modes also can alter the heat pattern resulting from the frequent disruptions which occur as a result of a locked mode. RP JANOS, AC (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4720 EP 4723 DI 10.1063/1.1143618 PN 2 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300059 ER PT J AU WATKINS, JG SALMONSON, J MOYER, R DOERNER, R LEHMER, R SCHMITZ, L HILL, DN AF WATKINS, JG SALMONSON, J MOYER, R DOERNER, R LEHMER, R SCHMITZ, L HILL, DN TI A FAST SCANNING PROBE FOR DIII-D SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID D DIVERTOR; TOKAMAKS AB A fast reciprocating probe has been developed for DIII-D which can penetrate the separatrix during H mode with up to 5 MW of NBI heating. The probe has been designed to carry various sensor tips into the scrape-off layer at a velocity of 3 m/s and dwell motionless for a programmed period of time. The driving force is provided by a pneumatic cylinder charged with helium to facilitate greater mass flow. The first series of experiments have been done using a Langmuir probe head with five graphite tips to measure radial profiles of n(e), T(e), phi(f), n(e), and phi(f). The amplitude and phase of the fluctuating quantities are measured by using specially constructed vacuum compatible 5-kV coaxial transmission lines which allow us to extend the measurements into the MHz range. TTZ ceramic bearings and fast stroke bellows were also specially designed for the DIII-D probe. Initial measurements will be presented. C1 EG&G,SPECIAL PROJECTS,ALBUQUERQUE,NM 87106. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP WATKINS, JG (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 7 TC 44 Z9 44 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 OCT PY 1992 VL 63 IS 10 BP 4728 EP 4730 DI 10.1063/1.1143621 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300061 ER PT J AU MEDLEY, SS JOHNSON, LC AF MEDLEY, SS JOHNSON, LC TI REMOTELY CONTROLLED ILLUMINATION SYSTEM FOR TFTR IN-VESSEL INSPECTION SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB Internal components of the Tokamak Fusion Test Reactor (TFTR) vacuum vessel are inspected routinely during nonoperational periods using in vacuo illumination probes in conjunction with a periscope/camera viewing system. The probes presently in use must be inserted manually by personnel in the test cell, and thus are not suitable during the DT operating phase of TFTR. A new probe concept was developed which is compact, mechanically robust, and remotely operated. Each probe consists of four 650 W tungsten-halogen lamps mounted on an inconel reflector and a rotatable, cylindrical shutter which protects the lamps from deposits during plasma operation. Six probes will be permanently mounted inside the vacuum vessel at top and bottom ports which are distributed to provide the most uniform illumination practicable. The probe design and results from prototype testing will be presented. RP MEDLEY, SS (reprint author), PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 1 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4738 EP 4740 DI 10.1063/1.1143625 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300064 ER PT J AU FUNSTEN, HO BARRACLOUGH, BL MCCOMAS, DJ AF FUNSTEN, HO BARRACLOUGH, BL MCCOMAS, DJ TI PINHOLE DETECTION IN THIN FOILS USED IN SPACE PLASMA DIAGNOSTIC INSTRUMENTATION SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID ENERGY AB The efficiency of thin foils which are used for charge state modification, start/stop pulse triggering, and UV shielding in space plasma diagnostic instrumentation is highly sensitive to pinholes in the foil. In this study, we present a high resolution method to map pinhole locations and sizes in thin foils based on the different transmission properties of incident ions through holes and hole-free regions of the foil. Results are presented for 200-eV ions transmitted through 0.2-, 0.5-, and 1.0-mug/cm2 carbon foils. Acceleration of transmitted ions into the imaging detector increases both the imaging resolution and the contrast between holes and hole-free regions of the foil. RP FUNSTEN, HO (reprint author), LOS ALAMOS NATL LAB,SPACE PLASMA PHYS GRP,LOS ALAMOS,NM 87545, USA. RI Funsten, Herbert/A-5702-2015 OI Funsten, Herbert/0000-0002-6817-1039 NR 8 TC 9 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4741 EP 4743 DI 10.1063/1.1143626 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300065 ER PT J AU BELL, RE JOHNSON, DW STRATTON, BC SYNAKOWSKI, EJ AF BELL, RE JOHNSON, DW STRATTON, BC SYNAKOWSKI, EJ TI ERROR ANALYSIS FOR CHARGE-EXCHANGE RECOMBINATION SPECTROMETER MEASUREMENTS OF ION TEMPERATURE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB A two-dimensional intensified photodiode array is used to measure charge exchange recombination emission in the TFTR. The noise of this detector has been characterized to provide a better estimation of the error bars associated with ion temperature measurements. Contributions to the measured signal include a dc level offset, an integrated dark signal, and the actual photon signal. In addition to photon noise, there is a significant readout noise. The analysis was complicated by a nonlinear response of the readout circuitry. The detector output is linearized and the pixel-to-pixel gain variation is removed with a white field correction. The noise has been modeled over a range of integration times of the detector and gains of the intensifier, allowing an estimation of the uncertainty in the measurement at each pixel, and therefore its appropriate weight in the fitting function. RP BELL, RE (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 4 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4744 EP 4746 DI 10.1063/1.1143627 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300066 ER PT J AU HWANG, YS FOREST, CB DARROW, DS GREENE, G ONO, M AF HWANG, YS FOREST, CB DARROW, DS GREENE, G ONO, M TI RECONSTRUCTION OF CURRENT-DENSITY DISTRIBUTIONS IN THE CDX-U TOKAMAK SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB Magnetic diagnostics are used to reconstruct current density profiles in noninductively driven plasmas in the CDX-U tokamak. The boundary magnetic fields are measured by 32 pickup coils and three flux loops attached at different poloidal positions inside the CDX-U vessel; in addition, internal magnetic probes are also used. Significant eddy currents are measured on the thick aluminum vessel and accounted for in the analysis. Two-dimensional current density distributions and magnetic flux contours are reconstructed from these measurements using a least-square-error technique. A finite element description of plasma currents is useful for general magnetic geometries which evolve from open field lines to closed flux surfaces. By increasing the number of elements, a converged current density distribution is obtained. RP HWANG, YS (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. RI Hwang, Yong-Seok/D-8347-2012 NR 4 TC 7 Z9 7 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4747 EP 4749 DI 10.1063/1.1143628 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300067 ER PT J AU MURPHY, JA SCOTT, SD TOWNER, HH AF MURPHY, JA SCOTT, SD TOWNER, HH TI PREPARING DIAGNOSTIC DATA FOR THE SNAP TRANSPORT CODE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB This paper describes the Program SNAPIN which is used to prepare data for transport analysis with the SNAP code. The data input to SNAP includes diagnostic profiles [n(e)(R), T(e)(R), T(i)(R), v(phi)(R), Z(eff)(R), P(rad)(R)] and measurements such as total plasma current, R(major), beam power, gas puff rate, etc. SNAPIN reads in the necessary TFTR data, allows editing of that data, including graphical editing of profile data and the selection of physics models. SNAPIN allows comparison of profile data from all diagnostics that measure a quantity, for example, electron temperature profiles from Thomson scattering and electron cyclotron emission (ECE). A powerful user interface is important to help the user prepare input data sets quickly and consistently, because hundreds of variables must be specified for each analysis. SNAPIN facilitates this by a careful organization of menus, display of all scalar data and switch settings within the menus, the graphical editing and comparison of profiles, and step-by-step checking for consistent physics controls [J. Murphy, S. Scott, and H. Towner, The SNAP User's Guide, Technical Report PPPL-TM-393, Princeton Plasma Physics Laboratory (1992)]. RP MURPHY, JA (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 3 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4750 EP 4752 DI 10.1063/1.1143629 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300068 ER PT J AU TOWNER, HH GOLDSTON, RJ HAMMETT, GW MURPHY, JA PHILLIPS, CK SCOTT, SD ZARNSTORFF, MC SMITHE, D AF TOWNER, HH GOLDSTON, RJ HAMMETT, GW MURPHY, JA PHILLIPS, CK SCOTT, SD ZARNSTORFF, MC SMITHE, D TI DATA-ANALYSIS ON TFTR USING THE SNAP TRANSPORT CODE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID PLASMAS AB This paper describes the between shots data analysis on TFTR using the one-dimensional equilibrium kinetic analysis code SNAP. SNAP accepts as input data: the measured plasma size and current, toroidal field, surface voltage, plasma composition (total Z(eff) and Z(eff) contribution from metallic impurities), edge neutral density, auxiliary heating power data (neutral beam power, energy, injection geometry and/or rf power and frequency), and measured profiles of T(e)(R), n(e)(R), T(i)(R), V(phi)(R), and P(rad)(R). SNAP iteratively calculates: (1) the mapping of profile data to a minor radius grid, (2) the magnetic topology including Shafranov shifted circular flux surfaces, (3) neutral beam attenuation and deposition profiles, (4) unthermalized beam ion density and beam power density delivered to thermal plasma species from a numerical solution to the Fokker-Planck equation, (5) the neutral density profile, (6) local heat and particle transport coefficients consistent with the measured profiles and calculated source terms, (7) ICRF power profiles from a reduced order full wave analysis and isotropic Stix quasilinear model, and (8) total neutron emissivity and plasma stored energy. Several ion heat transport models (including neoclassical chi(i) and chi(i) is-proportional-to chi(e)) are available to calculate an expected T(i)(r) profile in the absence of measurements. RP TOWNER, HH (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. RI Hammett, Gregory/D-1365-2011 OI Hammett, Gregory/0000-0003-1495-6647 NR 11 TC 32 Z9 32 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4753 EP 4756 DI 10.1063/1.1143630 PN 2 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300069 ER PT J AU NAGAYAMA, Y EDWARDS, AW AF NAGAYAMA, Y EDWARDS, AW TI ROTATIONAL SOFT-X-RAY TOMOGRAPHY OF NONCIRCULAR TOKAMAK PLASMAS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID TFTR AB A rotational tomography technique for noncircular tokamak plasmas has been developed. Using a linear transformation from an elliptic coordinate system to the circular one, and compensating for the Shafranov shift, the elliptic plasma shape is transformed to the concentric circular shape. Fitting the data of a quarter rotation to the Fourier-Bessel expansions, the tomography is performed. This technique is applied to the snake oscillation, to the slow sawtooth crash, and to the post-cursor oscillations of noncircular plasmas on JET. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543. JET JOINT UNDERTAKING,ABINGDON OX14 3EA,OXON,ENGLAND. NR 6 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4757 EP 4759 DI 10.1063/1.1143631 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300070 ER PT J AU SCHIVELL, J MONTICELLO, DA ZWEBEN, SJ AF SCHIVELL, J MONTICELLO, DA ZWEBEN, SJ TI MODELING FAST ALPHA-PARTICLE DISTRIBUTIONS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB We have developed a code for following the radial diffusion and slowing down of alpha particles from DT fusion. The partial differential equation is solved by a finite-difference method. Ion as well as electron drag is included. Any given source function of radius, time, and energy width can be handled correctly. The code has been used to examine time waveforms, radial distributions, and energy spectra. The results can be used to model signals expected from the alpha charge exchange recombination spectroscopy and collective Thomson ("gyrotron") scattering diagnostics. The code has also been used to calculate, as a function of diffusion coefficient, the flux of escaping fast ions that enters a lost-ion detector, and thus to deduce from measurements an upper limit for the diffusion of fast charged fusion products. RP SCHIVELL, J (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 12 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4760 EP 4763 DI 10.1063/1.1143632 PN 2 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300071 ER PT J AU KYRALA, GA AF KYRALA, GA TI PROPX AN X-RAY MANIPULATION PROGRAM SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB An interactive microcomputer program that performs some manipulations on an input x-ray spectrum is introduced and described. The program is used to calculate the effect of absorption by filters, transmission through filters, responsivity of photocathodes, responsivity of absorptive detectors, folding of responses, plotting of cross sections, and calculation, as a function of electron temperature, of the response due to a bremsstrahlung spectrum. Fluorescence from the targets is not included. Two different x-ray libraries are offered, one covers the x-ray range 30-10 000 eV with 288 energy points, and the other covers the energy range 10 eV-1 MeV with 250 energy points per decade. RP KYRALA, GA (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. NR 9 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 4768 EP 4770 DI 10.1063/1.1143635 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300073 ER EF