FN Thomson Reuters Web of Science™ VR 1.0 PT J AU TONSE, SR AF TONSE, SR TI PROTON RAPIDITY DISTRIBUTIONS FROM 60 GEV/N O-16 +AU COLLISIONS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON ULTRARELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS : QUARK MATTER 90 CY MAY 07-11, 1990 CL MENTON, FRANCE SP CNRS, CEA, SOC FRANCAISE PHYS, COLL FRANCE, MINIST RECH & TECHNOL FRANCE, CONSEIL REG PROVENCE COTE AZUR, ENERTEC, HERAEUS, LCCROY RES SYST, MERCK CLEVENOT ID NUCLEUS-NUCLEUS COLLISIONS; FLOW AB An analysis of the proton rapidity distribution in central O-16 + Au collisions at 60 GeV/n measured in the NA35 streamer chamber detector at the CERN SPS is presented. The charge excess of positive particles over negative particles was measured. The rapidity distribution of the charge excess which can be associated with the primordial protons in the collision is studied in terms of the nuclear stopping power and is compared to the predictions of various models. RP TONSE, SR (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 7 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD APR 1 PY 1991 VL 525 BP C689 EP C692 PG 4 WC Physics, Nuclear SC Physics GA FH892 UT WOS:A1991FH89200103 ER PT J AU TRUEMAN, TL AF TRUEMAN, TL TI THE RELATIVISTIC HEAVY-ION PROGRAM AT BROOKHAVEN SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON ULTRARELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS : QUARK MATTER 90 CY MAY 07-11, 1990 CL MENTON, FRANCE SP CNRS, CEA, SOC FRANCAISE PHYS, COLL FRANCE, MINIST RECH & TECHNOL FRANCE, CONSEIL REG PROVENCE COTE AZUR, ENERTEC, HERAEUS, LCCROY RES SYST, MERCK CLEVENOT AB The current heavy ion program at the AGS is reviewed. The schedule and characteristics of the Booster which will allow Au beams to be accelerated is presented. A call is made for Letters of Intent for RHIC experiments. RP TRUEMAN, TL (reprint author), BROOKHAVEN NATL LAB,BLDG 510F,UPTON,NY 11973, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD APR 1 PY 1991 VL 525 BP C117 EP C124 PG 8 WC Physics, Nuclear SC Physics GA FH892 UT WOS:A1991FH89200011 ER PT J AU TURKOT, F AF TURKOT, F TI A QUARK-GLUON PLASMA SEARCH IN PBAR-P AT SQUARE-ROOT-S = 1.8 TEV SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON ULTRARELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS : QUARK MATTER 90 CY MAY 07-11, 1990 CL MENTON, FRANCE SP CNRS, CEA, SOC FRANCAISE PHYS, COLL FRANCE, MINIST RECH & TECHNOL FRANCE, CONSEIL REG PROVENCE COTE AZUR, ENERTEC, HERAEUS, LCCROY RES SYST, MERCK CLEVENOT ID COLLISIONS AB We present a survey of the recent results of E-735 in its search for QGP signals at the Fermilab Collider. The basic data are the inclusive P(t) distributions of centrally produced pi, K, pBAR and LAMBDA-omicron as a function of total charged multiplicity in the collision; the variation of are particle ratios are derived. Preliminary results on pi-pi correlations and inclusive photon production are also presented. RP TURKOT, F (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 12 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 APR 1 PY 1991 VL 525 BP C165 EP C170 PG 6 WC Physics, Nuclear SC Physics GA FH892 UT WOS:A1991FH89200015 ER PT J AU VANHECKE, H AF VANHECKE, H TI MEASUREMENT OF KAONS IN THE HELIOS EXPERIMENT SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON ULTRARELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS : QUARK MATTER 90 CY MAY 07-11, 1990 CL MENTON, FRANCE SP CNRS, CEA, SOC FRANCAISE PHYS, COLL FRANCE, MINIST RECH & TECHNOL FRANCE, CONSEIL REG PROVENCE COTE AZUR, ENERTEC, HERAEUS, LCCROY RES SYST, MERCK CLEVENOT ID QUARK-GLUON PLASMA; STRANGENESS; COLLISIONS RP VANHECKE, H (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544, USA. NR 10 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD APR 1 PY 1991 VL 525 BP C227 EP C230 PG 4 WC Physics, Nuclear SC Physics GA FH892 UT WOS:A1991FH89200021 ER PT J AU VOGT, R GAVIN, S AF VOGT, R GAVIN, S TI J-PSI SUPPRESSION - CATCHING UP WITH THE COMOVERS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON ULTRARELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS : QUARK MATTER 90 CY MAY 07-11, 1990 CL MENTON, FRANCE SP CNRS, CEA, SOC FRANCAISE PHYS, COLL FRANCE, MINIST RECH & TECHNOL FRANCE, CONSEIL REG PROVENCE COTE AZUR, ENERTEC, HERAEUS, LCCROY RES SYST, MERCK CLEVENOT AB The combined role of inelastic scattering with nucleons and comoving secondary particles in J/psi suppression is explored. An analysis of the latest FNAL and CERN data suggests that the high-density comover contribution emerges with increasing incident energy and A. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RES INST THEORET PHYS,HELSINKI,FINLAND. RP VOGT, R (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 7 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD APR 1 PY 1991 VL 525 BP C693 EP C696 PG 4 WC Physics, Nuclear SC Physics GA FH892 UT WOS:A1991FH89200104 ER PT J AU VONGERSDORFF, H AF VONGERSDORFF, H TI IS THERE EVIDENCE FOR FLOW IN HEAVY-ION COLLISIONS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON ULTRARELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS : QUARK MATTER 90 CY MAY 07-11, 1990 CL MENTON, FRANCE SP CNRS, CEA, SOC FRANCAISE PHYS, COLL FRANCE, MINIST RECH & TECHNOL FRANCE, CONSEIL REG PROVENCE COTE AZUR, ENERTEC, HERAEUS, LCCROY RES SYST, MERCK CLEVENOT AB Calculations using a transverse hydrodynamical model with a phase transition in the equation of state are compared to recent heavy ion data. We argue that hydrodynamics alone cannot reproduce the low pT part of the experimental spectrum. RP VONGERSDORFF, H (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 11 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD APR 1 PY 1991 VL 525 BP C697 EP C700 PG 4 WC Physics, Nuclear SC Physics GA FH892 UT WOS:A1991FH89200105 ER PT J AU WIEMAN, H ABBOTT, S ARTHUR, A BERCOVITZ, J BIESER, F HARNDEN, CW JONES KLEINFELDER, S LEE, K MATIS, HS NAKAMURA, M MCPARLAND, C ODYNIEC, G OLSON, D PUGH, HG RAI, G RITTER, HG SYMONS, TJM WRIGHT, M WRIGHT, R RUDGE, A AF WIEMAN, H ABBOTT, S ARTHUR, A BERCOVITZ, J BIESER, F HARNDEN, CW JONES KLEINFELDER, S LEE, K MATIS, HS NAKAMURA, M MCPARLAND, C ODYNIEC, G OLSON, D PUGH, HG RAI, G RITTER, HG SYMONS, TJM WRIGHT, M WRIGHT, R RUDGE, A TI A TPC DETECTOR FOR THE STUDY OF HIGH MULTIPLICITY HEAVY-ION COLLISIONS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON ULTRARELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS : QUARK MATTER 90 CY MAY 07-11, 1990 CL MENTON, FRANCE SP CNRS, CEA, SOC FRANCAISE PHYS, COLL FRANCE, MINIST RECH & TECHNOL FRANCE, CONSEIL REG PROVENCE COTE AZUR, ENERTEC, HERAEUS, LCCROY RES SYST, MERCK CLEVENOT AB The design of a Time Projection Chamber (TPC) detector with complete pad coverage is presented. The TPC will allow the measurements of high multiplicity (approximately 200 tracks), relativistic nucleus-nucleus collisions initiated with the heaviest, most energetic projectiles available at the LBL BEVALAC accelerator facility. The front end electronics, composed of over 15,000 time sampling channels, will be located on the chamber. C1 UNIV CALIF DAVIS,DAVIS,CA 95616. RP WIEMAN, H (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 8 TC 13 Z9 13 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 APR 1 PY 1991 VL 525 BP C617 EP C620 PG 4 WC Physics, Nuclear SC Physics GA FH892 UT WOS:A1991FH89200088 ER PT J AU GIRARDELLO, L PASQUINUCCI, A PORRATI, M AF GIRARDELLO, L PASQUINUCCI, A PORRATI, M TI N = 2 MORSE-LIOUVILLE THEORY AND NONMINIMAL SUPERCONFORMAL THEORIES SO NUCLEAR PHYSICS B LA English DT Article ID O-2 FERMIONIC STRINGS; QUANTUM-FIELD-THEORY; WESS-ZUMINO MODEL; SUPERSYMMETRY BREAKING; STOCHASTIC GEOMETRY; STATISTICAL-MODELS; ALGEBRA; OPERATORS; SYMMETRY; EQUATION AB We define and study the Morse-Liouville theory, i.e. a massive deformation of the N = 2, d = 2 Liouville model. Standard arguments of N = 2, d = 2 supersymmetry allow the computation of correlation functions and fusion rules for subsets of (anti)chiral fields in the scaling regime, where N = 2 superconformal invariance is expected to be recovered. We find the relation c = 3(1 + 1/beta-2) > 3 between the coupling constant-beta and the central charge c of the scaling limit theory which is conjectured to represent sectors of non-minimal superconformal theories. C1 NATL INST NUCL PHYS,MILAN,ITALY. SCUOLA INT SUPER STUDI AVANZATI,SCUOLA INT SUPER STUDI AVANZATI,TRIESTE,ITALY. IST NAZL FIS NUCL,TRIESTE,ITALY. IST NAZL FIS NUCL,PISA,ITALY. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP GIRARDELLO, L (reprint author), UNIV MILAN,DIPARTMENTO FIS,I-20122 MILAN,ITALY. NR 43 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD APR 1 PY 1991 VL 352 IS 3 BP 769 EP 790 DI 10.1016/0550-3213(91)90106-8 PG 22 WC Physics, Particles & Fields SC Physics GA FD369 UT WOS:A1991FD36900008 ER PT J AU WHITESIDES, GE AF WHITESIDES, GE TI ERRONEOUS DATA IN NUCLEAR SAFETY GUIDE, TID-7016, REVISION 2, NUREG/CR-0095, ORNL/NUREG/CSD-6 (1978) SO NUCLEAR SAFETY LA English DT Note RP WHITESIDES, GE (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 APR-JUN PY 1991 VL 32 IS 2 BP 167 EP 167 PG 1 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA GM540 UT WOS:A1991GM54000001 ER PT J AU HARRINGTON, RM AF HARRINGTON, RM TI DESIGNING FOR SAFETY IN THE CONCEPTUAL DESIGN OF THE ADVANCED NEUTRON SOURCE SO NUCLEAR SAFETY LA English DT Article AB The Advanced Neutron Source (ANS) is a new research reactor facility for the Department of Energy currently in conceptual design at the Oak Ridge National Laboratory. Major design concepts for the heavy-water-cooled, -moderated, and -reflected reactor are described. The overall approach to nuclear safety adopted for the ANS relies heavily on probabilistic risk assessment and the incorporation of inherent means of emergency core cooling and passive decay heat removal; the traditional defense-in-depth philosophy is used to ensure a complete and balanced combination of safety features. Specific safety features envisioned for the conceptual design are reviewed: a passive emergency core cooling system that comprises submerged primary coolant piping, limited-volume piping cells, and gas-charged emergency coolant injectors; natural-circulation decay heat removal; fine-mesh, full-flow primary coolant filtration; and a large-volume, high-integrity, dual containment system. RP HARRINGTON, RM (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 21 TC 1 Z9 1 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 APR-JUN PY 1991 VL 32 IS 2 BP 199 EP 208 PG 10 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA GM540 UT WOS:A1991GM54000007 ER PT J AU DICKENS, JK ENGLAND, TR SCHENTER, RE AF DICKENS, JK ENGLAND, TR SCHENTER, RE TI CURRENT STATUS AND PROPOSED IMPROVEMENTS TO THE ANSI/ANS-5.1 AMERICAN NATIONAL STANDARD FOR DECAY HEAT POWER IN LIGHT WATER-REACTORS SO NUCLEAR SAFETY LA English DT Article AB The American National Standard for Decay Heat Power in Light Water Reactors (ANSI/ANS-5.1) was issued in 1979 and has been used extensively for the past decade. Since the standard was issued, there have been new decay-heat measurements, and new and improved calculational capabilities have been developed. In this article the standard is compared with these new data and with calculations based on improved methods. Three foreign standards or proposed standards have also been developed, and their contents are compared with the present American standard. Proposals for improving the standard are presented and discussed. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544. WESTINGHOUSE HANFORD CO,RICHLAND,WA 99352. RP DICKENS, JK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 49 TC 0 Z9 0 U1 0 U2 1 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 APR-JUN PY 1991 VL 32 IS 2 BP 209 EP 221 PG 13 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA GM540 UT WOS:A1991GM54000008 ER PT J AU MUHLHEIM, MD AF MUHLHEIM, MD TI ACTIVITIES RELATED TO WASTE MANAGEMENT SO NUCLEAR SAFETY LA English DT Article RP MUHLHEIM, MD (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 6 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 APR-JUN PY 1991 VL 32 IS 2 BP 230 EP 241 PG 12 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA GM540 UT WOS:A1991GM54000011 ER PT J AU BERTING, FM BAILEY, WJ AF BERTING, FM BAILEY, WJ TI SUMMARY OF FUEL PERFORMANCE ANNUAL-REPORT FOR 1988 SO NUCLEAR SAFETY LA English DT Article AB This article summarizes NUREG/CR-3950 (PNL-5210, Vol. 6), Fuel Performance Annual Report for 1988, which was published in May 1990. This eleventh annual report provides a description of fuel performance in commercial nuclear power plants during 1988 and an indication of trends. Brief summaries of fuel design changes, fuel surveillance programs, fuel operating experience, fuel problems, high-burnup fuel experience, and items of general significance are provided. References to more detailed information are included. RP BERTING, FM (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 86 TC 2 Z9 2 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 APR-JUN PY 1991 VL 32 IS 2 BP 242 EP 269 PG 28 WC Environmental Sciences; Nuclear Science & Technology SC Environmental Sciences & Ecology; Nuclear Science & Technology GA GM540 UT WOS:A1991GM54000012 ER PT J AU MOREL, JE MANTEUFFEL, TA AF MOREL, JE MANTEUFFEL, TA TI AN ANGULAR MULTIGRID ACCELERATION TECHNIQUE FOR SN EQUATIONS WITH HIGHLY FORWARD-PEAKED SCATTERING SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID ANISOTROPIC SCATTERING AB An angular multigrid method for the S(n) equations has been developed that is much more effective for highly forward-peaked scattering than the diffusion synthetic acceleration (DSA) method. Only one-dimensional slab geometry is considered in this study, but it appears that this method can be generalized to curvilinear and multidimensional geometries. The new method is derived, theoretically analyzed, and computationally tested. The angular multigrid method costs only about twice as much as the DSA method, but it gives a spectral radius of 0.6 in the asymptotic forward-peaked Fokker-Planck scattering limit, whereas the diffusion synthetic method gives a spectral radius of unity. C1 UNIV COLORADO,DEPT MATH,DENVER,CO 80204. RP MOREL, JE (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,RADIAT TRANSPORT GRP,X-6,MS B226,LOS ALAMOS,NM 87545, USA. NR 18 TC 32 Z9 35 U1 0 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 APR PY 1991 VL 107 IS 4 BP 330 EP 342 PG 13 WC Nuclear Science & Technology SC Nuclear Science & Technology GA FD825 UT WOS:A1991FD82500003 ER PT J AU TROUBETZKOY, ES AF TROUBETZKOY, ES TI OPTIMIZATION OF LINEAR MONTE-CARLO CALCULATIONS SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID VARIANCE BIASING SCHEMES AB The variance of the calculation is minimized on the basis of parameters generated by a learning technique. The optimum is obtained if sampling is biased proportionally to the expected root-mean-square score. The method is compared with existing methods, which bias proportionally to the expected score. RP TROUBETZKOY, ES (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,RADIAT TRANSPORT GRP,LOS ALAMOS,NM 87545, USA. NR 12 TC 3 Z9 3 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD APR PY 1991 VL 107 IS 4 BP 359 EP 364 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA FD825 UT WOS:A1991FD82500005 ER PT J AU HARIMA, Y TRUBEY, DK SAKAMOTO, Y TANAKA, S AF HARIMA, Y TRUBEY, DK SAKAMOTO, Y TANAKA, S TI GAMMA-RAY ATTENUATION IN THE VICINITY OF THE K-EDGE IN MOLYBDENUM, TIN, LANTHANUM, GADOLINIUM, TUNGSTEN, LEAD, AND URANIUM SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID BUILDUP FACTORS AB The values of gamma-ray buildup factors and attenuation coefficients rise steeply as the source energy decreases near the K edge in heavy materials and discontinuously fall at the K edge. However, the exposure rate attenuation factor, A(E, r) = D(E)B(E, mu-r) exp(-mu-r), given as a function of the penetration depth in centimetres, is relatively constant in the vicinity of the K edge. The development of a model that employs 4 K-shell X rays for the source shows that such behavior results from the large contribution of fluorescence radiation to the buildup factor for source photons of energies just above the K edge. In addition, an uncertainty in the extrapolation formula of the K parameter of the geometric progression buildup factor fitting function was removed for the energy range near the K edge. C1 OAK RIDGE NATL LAB,CTR RADIAT SHIELDING INFORMAT,OAK RIDGE,TN 37831. JAPAN ATOM ENERGY RES INST,TOKAI ESTAB,TOKAI,IBARAKI 31911,JAPAN. RP HARIMA, Y (reprint author), TOKYO INST TECHNOL,NUCL REACTORS RES LAB,MEGURO KU,TOKYO 152,JAPAN. NR 8 TC 3 Z9 3 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 APR PY 1991 VL 107 IS 4 BP 385 EP 393 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA FD825 UT WOS:A1991FD82500008 ER PT J AU RHOADES, WA CHILDS, RL AF RHOADES, WA CHILDS, RL TI A 3-DIMENSIONAL DISCRETE ORDINATES NEUTRON PHOTON TRANSPORT CODE SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Note RP RHOADES, WA (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 3 TC 11 Z9 12 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD APR PY 1991 VL 107 IS 4 BP 397 EP 398 PG 2 WC Nuclear Science & Technology SC Nuclear Science & Technology GA FD825 UT WOS:A1991FD82500010 ER PT J AU TZANOS, CP TESSIER, JH PEDERSEN, DR AF TZANOS, CP TESSIER, JH PEDERSEN, DR TI AN OPTIMIZATION STUDY FOR THE REACTOR VESSEL AUXILIARY COOLING SYSTEM OF A POOL LIQUID-METAL REACTOR SO NUCLEAR TECHNOLOGY LA English DT Article AB The effects of design parameters on the performance of the reactor vessel auxiliary cooling system (RVACS) of a pool liquid-metal reactor (LMR) are investigated. These parameters include (a) stack height, (b) size of the airflow gap, (c) system pressure loss, (d) fins on the guard vessel or the baffle wall, and (e) repeated ribs on the airflow channel walls. As a measure of performance, the peak sodium pool temperature during the transient following a reactor scram from full power was used. Horizontal ribs with a 0.003-m height and a 0.015-m pitch gave the best performance, i.e., the lowest peak sodium pool temperature during the scram transient. For a 3500-MW(thermal) LMR, they gave peak hot pool and peak cladding temperatures that were 52-degrees-C lower than those obtained with a reference RVACS having smooth airflow channel walls. RP TZANOS, CP (reprint author), ARGONNE NATL LAB,DIV REACTOR ENGN,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 4 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 APR PY 1991 VL 94 IS 1 BP 68 EP 79 PG 12 WC Nuclear Science & Technology SC Nuclear Science & Technology GA FC671 UT WOS:A1991FC67100006 ER PT J AU HYDER, ML AF HYDER, ML TI MEASUREMENTS OF IODINE UPTAKE IN FALLING WATER DROPLETS SO NUCLEAR TECHNOLOGY LA English DT Article AB The removal of gaseous iodine from air by water sprays is measured, using both ordinary water and a solution buffered to a pH near 9.5 with a carbonate mixture. The results are compared to the theoretical predictions of the 12WASH computer code. In all experiments, using both large and small spray droplets, the solution at the higher pH is approximately three times as effective at absorbing iodine from the air. This agrees with the predictions of the computer model for the smaller droplets studied. The computer code predicts no pH effect for large drops, probably because it assumes a well-mixed drop, and mixing during the fall time is too slow. RP HYDER, ML (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER LAB,POB 616,AIKEN,SC 29808, USA. NR 11 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 APR PY 1991 VL 94 IS 1 BP 80 EP 86 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA FC671 UT WOS:A1991FC67100007 ER PT J AU WALTON, JC AF WALTON, JC TI CORROSION CELLS - AN IMPORTANT FACTOR IN LOCALIZED WASTE PACKAGE GEOCHEMISTRY SO NUCLEAR TECHNOLOGY LA English DT Article ID MATHEMATICAL-MODEL; CREVICE; CRACKS; STEELS; PITS AB Disposal of nuclear waste by deep underground burial is being considered by the United States and many other countries. In many cases, the waste will be encased in an engineered waste package made of metal, concrete, or other materials. The ability of these disposal systems to limit the migration of radionuclides depends on a variety of factors, including the geochemical environment. If the waste package contains metallic parts, the corrosion reactions will dominate many aspects of the geochemistry in the immediate vicinity of a nuclear waste package. Some potential influences of metallic corrosion on the geochemical environment of the waste package are discussed. The corrosion reactions are a result of interaction or coupling of corrosion and geochemical processes. A generalized model is presented that describes the electrochemistry developed in corrosion cells and interaction with the surrounding geochemical environment. The model is first applied to laboratory data on crevice corrosion and then used to perform a parametric study. The results suggest that corrosion cells that lead to significant modifications to the geochemical environment are likely. The formation of corrosion cells around the waste package leads to large uncertainties concerning the geochemical environment in which radionuclide release rate and container corrosion will take place. Models and experiments of corrosion, waste form dissolution, and release rate need to take the expected uncertainty in geochemical environment into account. RP WALTON, JC (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 14 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 APR PY 1991 VL 94 IS 1 BP 114 EP 123 PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA FC671 UT WOS:A1991FC67100011 ER PT J AU CHAPPIDI, PR GUNNERSON, FS PASAMEHMETOGLU, KO AF CHAPPIDI, PR GUNNERSON, FS PASAMEHMETOGLU, KO TI FILM-BOILING DRAG AND HEAT-TRANSFER ON A FLAT SURFACE SO NUMERICAL HEAT TRANSFER PART A-APPLICATIONS LA English DT Article ID CONVECTION AB Stable film-boiling flow along a vertical flat plate is analyzed theoretically for a water-steam system at atmospheric pressure. This numerical study indicates that skin friction drag on the plate in a film-boiling flow may increase or decrease relative to the single-phase (all liquid) flow level and that the wall heat transfer coefficient always deteriorates in a film-boiling flow. Subcooling promotes wall heat transfer but may increase or decrease the wall skin friction beyond the single-phase flow level. Adverse streamwise buoyancy force (simulated by downward film-boiling flow) acting on the vapor film will separate the vapor flow. C1 UNIV CENT FLORIDA,DEPT MECH ENGN,ORLANDO,FL 32816. RP CHAPPIDI, PR (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV NUCL TECHNOL & ENGN,MAIL STOP K-559,LOS ALAMOS,NM 87545, USA. NR 20 TC 0 Z9 0 U1 1 U2 2 PU HEMISPHERE PUBL CORP PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 1040-7782 J9 NUMER HEAT TR A-APPL JI Numer. Heat Tranf. A-Appl. PD APR-MAY PY 1991 VL 19 IS 3 BP 327 EP 344 DI 10.1080/10407789108944853 PG 18 WC Thermodynamics; Mechanics SC Thermodynamics; Mechanics GA FH437 UT WOS:A1991FH43700005 ER PT J AU SIMPSON, ML SCHMOYER, RL HUNT, MA AF SIMPSON, ML SCHMOYER, RL HUNT, MA TI MOMENT INVARIANTS FOR AUTOMATED INSPECTION OF PRINTED MATERIAL SO OPTICAL ENGINEERING LA English DT Article DE MOMENT INVARIANTS; AUTOMATED INSPECTION; IMAGE PROCESSING; PRINTED MATERIAL; FLAW SEVERITY ID RECOGNITION; IMAGE AB The use of moment invariants for the detection of flaws in automated image processing inspection of printed graphic material is investigated. Prior work with moment invariants has concentrated on two-dimensional image pattern recognition. A major limitation in pattern recognition applications has been the segmentation of the image from its background. Automated image processing inspection of printed material does not suffer from this limitation because a standard image background exists. The potential for separating flawed and unflawed printed material using moment invariants is demonstrated with formal statistical experiments. RP SIMPSON, ML (reprint author), OAK RIDGE NATL LAB,DIV INSTRUMENTAT & CONTROLS,MARTIN MARIETTA ENERGY SYST,OAK RIDGE,TN 37831, USA. NR 16 TC 3 Z9 3 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD APR PY 1991 VL 30 IS 4 BP 424 EP 430 DI 10.1117/12.55813 PG 7 WC Optics SC Optics GA FF497 UT WOS:A1991FF49700009 ER PT J AU HAWKINS, RJ DERI, RJ WADA, O AF HAWKINS, RJ DERI, RJ WADA, O TI OPTICAL POWER TRANSFER IN VERTICALLY INTEGRATED IMPEDANCE-MATCHED WAVE-GUIDE PHOTODETECTORS - PHYSICS AND IMPLICATIONS FOR DIODE-LENGTH REDUCTION SO OPTICS LETTERS LA English DT Article ID WAVE-GUIDE; MONOLITHIC INTEGRATION; PHOTODIODES; EPITAXY; INP AB We identify the physical basis of the irregular absorption (spatial transients) observed in vertically integrated and impedance-matched waveguide/photodiodes using numerical simulations. We then show how the mechanism underlying these transients can be exploited to design diodes 500% shorter than conventional evanescently coupled waveguide/photodiodes, in order to achieve low capacitance and high-speed operation. C1 BELLCORE,RED BANK,NJ 07701. FUJITSU LABS LTD,ATSUGI 24301,JAPAN. RP HAWKINS, RJ (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 11 TC 19 Z9 19 U1 2 U2 5 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD APR 1 PY 1991 VL 16 IS 7 BP 470 EP 472 DI 10.1364/OL.16.000470 PG 3 WC Optics SC Optics GA FD812 UT WOS:A1991FD81200010 PM 19773969 ER PT J AU KAPTEYN, HC MURNANE, MM SZOKE, A FALCONE, RW AF KAPTEYN, HC MURNANE, MM SZOKE, A FALCONE, RW TI PREPULSE ENERGY SUPPRESSION FOR HIGH-ENERGY ULTRASHORT PULSES USING SELF-INDUCED PLASMA SHUTTERING SO OPTICS LETTERS LA English DT Article ID AMPLIFICATION; GENERATION; FIBERS AB We demonstrate the technique of self-induced plasma shuttering as a means of suppressing prepulse energy that accompanies high-energy, ultrashort laser pulses. This technique makes possible the generation of clean, high-intensity subpicosecond laser pulses even in the presence of high levels of amplified spontaneous emission from the laser system. Low prepulse energy is important in applications such as the generation of solid-density subpicosecond plasmas. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RI Kapteyn, Henry/H-6559-2011 OI Kapteyn, Henry/0000-0001-8386-6317 NR 17 TC 111 Z9 113 U1 2 U2 9 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD APR 1 PY 1991 VL 16 IS 7 BP 490 EP 492 DI 10.1364/OL.16.000490 PG 3 WC Optics SC Optics GA FD812 UT WOS:A1991FD81200017 PM 19773976 ER PT J AU TREBINO, R HAYDEN, CC AF TREBINO, R HAYDEN, CC TI ANTIRESONANT-RING TRANSIENT SPECTROSCOPY SO OPTICS LETTERS LA English DT Article ID INTERFEROMETRY; POLARIZATION; OPTICS AB We show theoretically and experimentally that the antiresonant ring is a versatile detection arrangement in ultrafast spectroscopy that permits accurate optical subtraction of probe-laser background light, independent measurement of absorption and refractive-index transients through optical heterodyning, and improvement of signal-to-noise ratios. In addition, because the sample medium is placed off center in the ring, it also permits tunable high-pass filter operation: signals from effects with time scales longer than twice the light travel time from the sample to the ring center can be suppressed. RP TREBINO, R (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. NR 22 TC 15 Z9 15 U1 1 U2 6 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD APR 1 PY 1991 VL 16 IS 7 BP 493 EP 495 DI 10.1364/OL.16.000493 PG 3 WC Optics SC Optics GA FD812 UT WOS:A1991FD81200018 PM 19773977 ER PT J AU VANDERSLUYS, LS KUBAS, GJ CAULTON, KG AF VANDERSLUYS, LS KUBAS, GJ CAULTON, KG TI REACTIVITY OF RU(H2)(H)2(PPH3)3 - DIMERIZATION TO FORM (PPH3)2(H)RU(MU-H)3RU(PPH3)3 AND DECARBONYLATION OF ETHANOL UNDER MILD CONDITIONS SO ORGANOMETALLICS LA English DT Article ID MOLECULAR-HYDROGEN COMPLEXES; ZEROVALENT OLEFINIC DERIVATIVES; TRANSITION-METAL POLYHYDRIDES; RUTHENIUM HYDRIDE COMPLEXES; RAY CRYSTAL-STRUCTURE; M = FE; CATALYTIC-HYDROGENATION; DIHYDROGEN COMPLEX; CARBON-DIOXIDE; H-H AB Loss of H-2 from RuH4(PPh3)3 (1) leads to formation of RuH2(PPh3)3; this intermediate has been shown to dimerize with loss of a phosphine to form (PPh3)2(H)Ru(mu-H)3Ru(PPh3)3 (3). Formation of RuH2(PPh3)3 in the presence of ethanol leads to decarbonylation of the alcohol and formation of RuH2(PPh3)3(CO) (7), under the mild conditions of nonbasic solutions at 25-degrees-C. Reaction of 1 with methanol, 1-propanol, or benzyl alcohol at 60-degrees-C also results in decarbonylation and formation of 7. The mechanisms of formation of these complexes are discussed. C1 INDIANA UNIV,DEPT CHEM,BLOOMINGTON,IN 47405. LOS ALAMOS NATL LAB,INORGAN & STRUCT CHEM GRP INC 4,LOS ALAMOS,NM 87545. NR 55 TC 41 Z9 41 U1 2 U2 15 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD APR PY 1991 VL 10 IS 4 BP 1033 EP 1038 DI 10.1021/om00050a039 PG 6 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA FG976 UT WOS:A1991FG97600039 ER PT J AU FISH, RH FONG, RH TRAN, A BARALT, E AF FISH, RH FONG, RH TRAN, A BARALT, E TI HETEROAROMATIC NITROGEN LIGAND STUDIES WITH THE (ETA-5-PENTAMETHYLCYCLOPENTADIENYL)RUTHENIUM CATION - ETA-1(N) AND ETA-6(PI) BONDING MODES AND FACTORS THAT INFLUENCE A NITROGEN TO PI-REARRANGEMENT SO ORGANOMETALLICS LA English DT Note AB The reactions of the (eta-5-pentamethylcyclopentadienyl)ruthenium tris(acetonitrile) cationic complex [Cp*Ru(CH3CN)3](OTf) with pyridine (1), 2-methylpyridine (2), and quinoline (3) were studied to ascertain bonding modes as a function of heteroaromatic nitrogen ligand structure. Ligand 1 bonds eta-1(N) and forms mono- or tris(pyridine) complexes with [Cp*Ru(CH3CN)3]+ depending on ligand concentration. Ligand 2 only forms an eta-6 complex with [Cp*Ru(CH3CN)3]+, while ligand 3 also forms an eta-6 complex, but with the benzo ring not the nitrogen ring. In the presence of excess pyridine, the complexed CH3CN ligands are fully displaced to form [Cp*Ru(eta-1(N)-pyridine)3]+, while in the presence of excess 2 or 3 only the [Cp*Ru(eta-1(N)-ligand)(CH3CN)2]+ complexes are formed. The latter [Cp*Ru(eta-1(N)-ligand)(CH3CN)2]+ complexes with ligands 2 and 3 were not isolated; rather, they undergo a rapid nitrogen (N) to pi rearrangement to the corresponding eta-6 complexes, [Cp*Ru(eta-6-2-methylpyridine or quinoline)]+. The isolation of [Cp*Ru(eta-1(N)-pyridine)(CH3CN)2]+ and its conversion to [Cp*Ru(eta-6-pyridine)]+ clearly demonstrates the pathway to the eta-6 complexes. Ligand-exchange reactions of [Cp*Ru(eta-6-pyridine)]+ with CD3CN and pyridine-d5 show facile replacement of the eta-6-bonded pyridine, while the former result with CD3CN ligand exchange proves that the N to pi rearrangement is not reversible. Factors such as ligand steric effects and the propensity of the Cp*Ru+ group to act as an arenophile will also be discussed. RP FISH, RH (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 7 TC 35 Z9 35 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD APR PY 1991 VL 10 IS 4 BP 1209 EP 1212 DI 10.1021/om00050a067 PG 4 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA FG976 UT WOS:A1991FG97600067 ER PT J AU ELLISON, JW PASSAGE, MB YU, LC YEN, PH MOHANDAS, TK SHAPIRO, LJ AF ELLISON, JW PASSAGE, MB YU, LC YEN, PH MOHANDAS, TK SHAPIRO, LJ TI ISOLATION AND CHARACTERIZATION OF HUMAN GENES THAT ESCAPE X-INACTIVATION SO PEDIATRIC RESEARCH LA English DT Meeting Abstract C1 UNIV CALIF LOS ANGELES,LOS ANGELES CTY HARBOR MED CTR,DIV MED GENET,TORRANCE,CA 90509. HOWARD HUGHES MED INST,TORRANCE,CA. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 0 TC 1 Z9 1 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0031-3998 J9 PEDIATR RES JI Pediatr. Res. PD APR PY 1991 VL 29 IS 4 BP A128 EP A128 PN 2 PG 1 WC Pediatrics SC Pediatrics GA FE038 UT WOS:A1991FE03800749 ER PT J AU GAYLORD, MS SMITH, ZL LORCH, V BLANK, ML SHYDER, F AF GAYLORD, MS SMITH, ZL LORCH, V BLANK, ML SHYDER, F TI REDUCED ACETYLHYDROLASE (ACH) ACTIVITY MAY PREDISPOSE INFANTS TO LUNG INJURY FROM PLATELET-ACTIVATING-FACTOR (PAF) SO PEDIATRIC RESEARCH LA English DT Meeting Abstract C1 UNIV TENNESSEE,MED CTR,KNOXVILLE,TN 37996. OAK RIDGE ASSOCIATED UNIV,DIV MED SCI,OAK RIDGE,TN 37830. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0031-3998 J9 PEDIATR RES JI Pediatr. Res. PD APR PY 1991 VL 29 IS 4 BP A214 EP A214 PN 2 PG 1 WC Pediatrics SC Pediatrics GA FE038 UT WOS:A1991FE03801265 ER PT J AU MADAN, A LIU, W LIN, C CLEMONS, GK CURTIN, PT AF MADAN, A LIU, W LIN, C CLEMONS, GK CURTIN, PT TI ERYTHROPOIETIN GENE-EXPRESSION IS DIRECTED TO HEMATOPOIETIC TISSUES OF TRANSGENIC MICE BY AN ERYTHROID-SPECIFIC ENHANCER SO PEDIATRIC RESEARCH LA English DT Meeting Abstract C1 UNIV CALIF SAN FRANCISCO,DEPT MED,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT PEDIAT,SAN FRANCISCO,CA 94143. UNIV CALIF BERKELEY,HOWARD HUGHES MED INST,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0031-3998 J9 PEDIATR RES JI Pediatr. Res. PD APR PY 1991 VL 29 IS 4 BP A145 EP A145 PN 2 PG 1 WC Pediatrics SC Pediatrics GA FE038 UT WOS:A1991FE03800848 ER PT J AU WING, P VANHECKE, JF AF WING, P VANHECKE, JF TI THE OPTICAL DISK SOLUTION SO PERSONNEL JOURNAL LA English DT Article RP WING, P (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV PERSONNEL SERV,LAB SYST & RECORDS GRP,LOS ALAMOS,NM 87544, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ACC COMMUNICATIONS INC PI COSTA MESA PA 245 FISCHER AVE, COSTA MESA, CA 92626 SN 0031-5745 J9 PERS J JI Pers. J. PD APR PY 1991 VL 70 IS 4 BP 92 EP & PG 0 WC Psychology, Applied SC Psychology GA FE567 UT WOS:A1991FE56700011 ER PT J AU DOUIN, J DAHMEN, U WESTMACOTT, KH AF DOUIN, J DAHMEN, U WESTMACOTT, KH TI ON THE FORMATION OF TWINNED PRECIPITATES IN AL-GE ALLOYS SO PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES LA English DT Article ID ALUMINUM-SILICON ALLOYS; ATOMIC-STRUCTURE; TILT BOUNDARIES; FINE PARTICLES; GERMANIUM; GROWTH; NUCLEATION; VACANCIES; DIAMOND AB High-resolution microscopy has been used systematically to obtain a detailed understanding of the morphologies and substructures of Ge needle or lath precipitates in an Al-Ge alloy. We show that the many orientation relationships observed in twinned <100> and <110> needles can be related to only three basic lattice correspondences. The feature common to <100> and <110> needles is the arrangement of five cozonal twin segments whose relative degrees of development determines the cross-section morphology. Proposed growth mechanisms based on multiple twinning can account for the formation of all the different observed precipitate morphologies and defect substructures. The central role of twinning and the critical need for vacancies during nucleation are discussed in terms of possible models for nuclei that maximize the number of Ge-Ge bonds through twinning and thus minimize the need for vacancies. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,DIV MAT SCI,BERKELEY,CA 94720. NR 41 TC 33 Z9 34 U1 0 U2 3 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8637 J9 PHILOS MAG B JI Philos. Mag. B-Phys. Condens. Matter Stat. Mech. Electron. Opt. Magn. Prop. PD APR PY 1991 VL 63 IS 4 BP 867 EP 890 DI 10.1080/13642819108205543 PG 24 WC Materials Science, Multidisciplinary; Mechanics; Physics, Applied; Physics, Condensed Matter SC Materials Science; Mechanics; Physics GA FL868 UT WOS:A1991FL86800006 ER PT J AU HACHAM, H FREEMAN, SE GANGE, RW MAYTUM, DJ SUTHERLAND, JC SUTHERLAND, BM AF HACHAM, H FREEMAN, SE GANGE, RW MAYTUM, DJ SUTHERLAND, JC SUTHERLAND, BM TI DO PYRIMIDINE DIMER YIELDS CORRELATE WITH ERYTHEMA INDUCTION IN HUMAN SKIN IRRADIATED INSITU WITH ULTRAVIOLET-LIGHT (275-365NM) SO PHOTOCHEMISTRY AND PHOTOBIOLOGY LA English DT Note ID XERODERMA-PIGMENTOSUM CELLS; BROMIDE-STAINED DNA; ACTION SPECTRA; STRAND BREAKS; RADIATION; QUANTITATION; REPAIR; GELS; ELECTROPHORESIS; ENDONUCLEASE AB Ultraviolet radiation produces erythema in human skin, and damages the DNA of living cells in skin. Previous work showed that broad-band UV-B (290-320 nm) radiation produced higher levels of cyclobutyl pyrimidine dimers in DNA of individuals with high UV-B sensitivity (low minimal erythema dose) than in subjects of low UV-B sensitivity [Freeman et al. (1986) J. Invest. Dermatol., 86, 34-36]. We examined the relationship between erythema induction and dimer yields in DNA of human skin irradiated in situ with narrow band radiation spanning the wavelength range 275-365 nm. We find that, in general, higher dimer yields are produced per incident photon in volunteers with higher susceptibility to erythema induced by radiation of the same wavelength. C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. HARVARD UNIV,SCH MED,DEPT DERMATOL,WELLMAN LABS,BOSTON,MA 02115. FU NCI NIH HHS [CA 23096]; NIAMS NIH HHS [5 R29-AR-35296] NR 33 TC 28 Z9 28 U1 1 U2 1 PU AMER SOC PHOTOBIOLOGY PI AUGUSTA PA BIOTECH PARK, 1021 15TH ST, SUITE 9, AUGUSTA, GA 30901-3158 SN 0031-8655 J9 PHOTOCHEM PHOTOBIOL JI Photochem. Photobiol. PD APR PY 1991 VL 53 IS 4 BP 559 EP 563 DI 10.1111/j.1751-1097.1991.tb03671.x PG 5 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA FD243 UT WOS:A1991FD24300020 PM 1857749 ER PT J AU GALLONI, R RUTH, M DESALVO, A TSUO, YS AF GALLONI, R RUTH, M DESALVO, A TSUO, YS TI LOW-ENERGY ION-BEAM POST HYDROGENATION OF PHOSPHOR IMPLANTED AMORPHOUS-SILICON FILMS SO PHYSICA B LA English DT Article; Proceedings Paper CT 6TH TRIESTE SYMP ON SEMICONDUCTORS CY AUG 27-31, 1990 CL INT CTR THEORET PHYS, TRIESTE, ITALY SP INT UNION PURE & APPL PHYS, INT CTR THEORET PHYS HO INT CTR THEORET PHYS ID MECHANISMS AB Glow-discharge-deposited intrinsic hydrogenated amorphous silicon films have been doped by P+ implantation in varying doses between 10(16) and 2 x 10(21) atoms/cm3 and annealed at 260-degrees-C. Subsequent hydrogenation of the samples produces a decrease in conductivity explained by a hydrogen-induced decrease of the electrically active fraction of the dopant. C1 UNIV BOLOGNA,FAC INGN,DIPARTIMENTO CHIM APPL & SCI MAT,I-40136 BOLOGNA,ITALY. SOLAR ENERGY RES INST,GOLDEN,CO 80401. RP GALLONI, R (reprint author), CNR,LAMEL 1,I-40126 BOLOGNA,ITALY. NR 8 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1991 VL 170 IS 1-4 BP 273 EP 276 DI 10.1016/0921-4526(91)90137-4 PG 4 WC Physics, Condensed Matter SC Physics GA FT138 UT WOS:A1991FT13800037 ER PT J AU HALLER, EE AF HALLER, EE TI ELECTRONIC-PROPERTIES OF HYDROGEN-RELATED COMPLEXES IN PURE SEMICONDUCTORS SO PHYSICA B LA English DT Article; Proceedings Paper CT 6TH TRIESTE SYMP ON SEMICONDUCTORS CY AUG 27-31, 1990 CL INT CTR THEORET PHYS, TRIESTE, ITALY SP INT UNION PURE & APPL PHYS, INT CTR THEORET PHYS HO INT CTR THEORET PHYS ID PHOTOTHERMAL IONIZATION SPECTROSCOPY; HIGH-PURITY; GERMANIUM-CRYSTALS; ACCEPTOR COMPLEXES; TUNNELING HYDROGEN; FRACTIONAL-CHARGE; ATOMIC-HYDROGEN; GROUND-STATE; SILICON; IMPURITIES AB Hydrogen has been shown to activate the neutral impurities carbon, silicon and oxygen in ultra-pure germanium and form shallow level complexes. The double acceptors beryllium and zinc in silicon and germanium, as well as the triple acceptor copper in germanium, can be partially passivated, leading to single hole acceptors. The study of the electronic level spectrum of the single carrier bound to these centers at low temperatures has provided much information on symmetry and composition. Most centers reveal a symmetry axis along [111] and are static. In some cases hydrogen has been found to tunnel between equivalent real space positions. Photothermal ionization spectroscopy (PTIS) has been the most important tool for the study of the optical transitions of the hole (electron) in these hydrogen containing complexes. This photoconductivity technique combines high sensitivity with high resolution and permits the study of shallow acceptors or donors present at concentrations as low as 10(8) cm-3. Even lower limits may be attained under favorable circumstances. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP HALLER, EE (reprint author), UNIV CALIF BERKELEY,BERKELEY,CA 94720, USA. NR 54 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD APR PY 1991 VL 170 IS 1-4 BP 351 EP 360 DI 10.1016/0921-4526(91)90146-6 PG 10 WC Physics, Condensed Matter SC Physics GA FT138 UT WOS:A1991FT13800046 ER PT J AU WILLIS, JO TOMENO, I MIYATAKE, T NICHOLS, TR ITOH, T TAI, K KOSHIZUKA, N TANAKA, S AF WILLIS, JO TOMENO, I MIYATAKE, T NICHOLS, TR ITOH, T TAI, K KOSHIZUKA, N TANAKA, S TI SPECIFIC-HEAT AND MAGNETIC-SUSCEPTIBILITY MEASUREMENTS OF YBA2CU4O8 - A STUDY OF THE DENSITY OF ELECTRONIC STATES SO PHYSICA C LA English DT Article ID SUPERCONDUCTING PROPERTIES AB Specific heat and magnetic susceptibility measurements are reported for polycrystalline bulk samples of YBa2Cu4O8 and DyBa2Cu4O8 prepared at high oxygen pressure and for a companion sample of YBa2Cu3O7. The magnitude of the idealized specific heat jump DELTA-C(p)/T at T(c) (= 80 +/- 0.5 K) is 16 +/- 2 mJ/(mol K2) and the transition width DELTA-T(c) is about 3 K for YBa2Cu4O8. The corresponding values for DyBa2Cu4O8 are 75 K, 15 +/- 2 mJ/(mol K2) and 3.3 K. The size of these jumps is greatly reduced compared to YBa2Cu3O7. The normal state spin susceptibility of YBa2Cu4O8 is calculated to be only about 15% smaller than in YBa2Cu3O7, and it is temperature dependent. Both these results are consistent with a smaller electronic density of states for YBa2Cu4O8. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR EXPLORATORY RES & DEV,LOS ALAMOS,NM 87545. RP WILLIS, JO (reprint author), INT SUPERCONDUCT TECHNOL CTR,SUPERCONDUCT RES LAB,10-13 SHINONOME 1 CHOME,KOTO KU,TOKYO 135,JAPAN. NR 22 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD APR 1 PY 1991 VL 175 IS 1-2 BP 81 EP 88 DI 10.1016/0921-4534(91)90237-S PG 8 WC Physics, Applied SC Physics GA FG192 UT WOS:A1991FG19200010 ER PT J AU KWEI, GH LAWSON, AC MOSTOLLER, M AF KWEI, GH LAWSON, AC MOSTOLLER, M TI VIBRATIONAL PROPERTIES AND ATOMIC DEBYE TEMPERATURES FOR LA2CUO4 FROM NEUTRON POWDER DIFFRACTION SO PHYSICA C LA English DT Article ID SUPERCONDUCTIVITY; PHASE; TC AB Neutron powder diffraction data taken at five different temperatures have been used to determined both isotropic and anisotropic thermal parameters for atoms in La2CuO4. A fit of these parameters to a Debye-Waller model in turn yields the corresponding isotropic and anisotropic atomic Debye temperatures. The elastic properties of the atoms in these crystals are discussed in the context of the results from specific heat measurements, neutron resonance Doppler broadening studies of atomic Debye temperatures, inelastic neutron scattering studies of phonon densities of states and phonon dispersion curves, observed structural instabilities or anomalies associated with superconductivity at high temperatures, and results from lattice dynamical calculations. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37830. RP KWEI, GH (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 30 TC 9 Z9 9 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD APR 1 PY 1991 VL 175 IS 1-2 BP 135 EP 142 DI 10.1016/0921-4534(91)90244-S PG 8 WC Physics, Applied SC Physics GA FG192 UT WOS:A1991FG19200017 ER PT J AU SKALA, L KENKRE, VM WEISER, MW KATZ, JD AF SKALA, L KENKRE, VM WEISER, MW KATZ, JD TI VACANCY MOTION IN MAGNESIUM-OXIDE ANALYZED VIA THE CNDO/2 CLUSTER MODEL SO PHYSICA STATUS SOLIDI B-BASIC RESEARCH LA English DT Article AB The dynamics of vacancies in magnesium oxide are studied applying the CNDO/2 method to calculate the electronic properties of clusters both, with and without magnesium and oxygen vacancies. The potentials for vacancy motion are calculated and detailed information about the character of bonding in the neighbourhood of a vacancy is obtained. It is found that the potential for magnesium ion migration is more squared-off than the potential for oxygen ion migration. The shape of the potential well is expected to have practical relevance in microwave-driven ionic diffusion. C1 UNIV NEW MEXICO,CTR MICROENG CERAM,ALBUQUERQUE,NM 87131. UNIV NEW MEXICO,DEPT PHYS & ASTRON,ALBUQUERQUE,NM 87131. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544. NR 13 TC 5 Z9 5 U1 1 U2 1 PU AKADEMIE VERLAG GMBH PI BERLIN PA MUHLENSTRASSE 33-34, D-13187 BERLIN, GERMANY SN 0370-1972 J9 PHYS STATUS SOLIDI B JI Phys. Status Solidi B-Basic Res. PD APR PY 1991 VL 164 IS 2 BP 515 EP 524 DI 10.1002/pssb.2221640220 PG 10 WC Physics, Condensed Matter SC Physics GA FU660 UT WOS:A1991FU66000019 ER PT J AU ZWANZIGER, JW RUCKER, SP CHINGAS, GC AF ZWANZIGER, JW RUCKER, SP CHINGAS, GC TI MEASURING THE GEOMETRIC COMPONENT OF THE TRANSITION-PROBABILITY IN A 2-LEVEL SYSTEM SO PHYSICAL REVIEW A LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; BERRY PHASE; DISSIPATIVE SYSTEMS; ADIABATIC THEOREM AB We describe the measurement of a component of the nonadiabatic transition probability in a two-level system that depends only on the path through parameter space followed by the Hamiltonian, and not on how fast the path is traversed [M. V. Berry, Proc. R. Soc. London 430, 405 (1990)]. We performed the measurement by sweeping a radio-frequency field through the Zeeman resonance of carbon-13 in a static magnetic field and measuring the transition probability P at the end of each sweep. We found that, for appropriately chosen radio-frequency sweep forms, a factor of P is independent of the duration of the sweep, in accordance with the theory of Berry. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP ZWANZIGER, JW (reprint author), INDIANA UNIV,DEPT CHEM,BLOOMINGTON,IN 47405, USA. NR 31 TC 46 Z9 46 U1 2 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR 1 PY 1991 VL 43 IS 7 BP 3232 EP 3240 DI 10.1103/PhysRevA.43.3232 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FG216 UT WOS:A1991FG21600004 ER PT J AU COHEN, JS STRUENSEE, MC AF COHEN, JS STRUENSEE, MC TI IMPROVED ADIABATIC CALCULATION OF MUONIC-HYDROGEN-ATOM CROSS-SECTIONS .1. ISOTOPIC EXCHANGE AND ELASTIC-SCATTERING IN ASYMMETRIC COLLISIONS SO PHYSICAL REVIEW A LA English DT Article ID D-T FUSION; DEUTERIUM-TRITIUM MIXTURES; CATALYZED FUSION; THERMALIZATION; GAS; TEMPERATURE AB The improved adiabatic representation is used in calculations of elastic and isotopic-exchange cross sections for asymmetric collisions of p-mu, d-mu, and t-mu with bare p, d, and t nuclei and with H, D, and T atoms. This formulation dissociates properly, correcting a well-known deficiency of the standard adiabatic method for muonic-atom collisions, and includes some effects at zeroth order that are normally considered nonadiabatic. The electronic screening is calculated directly and precisely within the improved adiabatic description; it is found to be about 30% smaller in magnitude than the previously used value at large internuclear distances and to deviate considerably from the asymptotic form at small distances. The reactance matrices, needed for calculations of molecular-target effects, are given in tables. RP COHEN, JS (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 42 TC 53 Z9 53 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR 1 PY 1991 VL 43 IS 7 BP 3460 EP 3473 DI 10.1103/PhysRevA.43.3460 PG 14 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FG216 UT WOS:A1991FG21600028 ER PT J AU PARKER, SD MCCURDY, CW RESCIGNO, TN LENGSFIELD, BH AF PARKER, SD MCCURDY, CW RESCIGNO, TN LENGSFIELD, BH TI ELECTRONIC EXCITATION OF H-2 BY ELECTRON-IMPACT - CLOSE-COUPLING CALCULATIONS USING THE COMPLEX KOHN VARIATIONAL METHOD SO PHYSICAL REVIEW A LA English DT Article ID LINEAR-ALGEBRAIC APPROACH; CROSS-SECTIONS; SEPARABLE APPROXIMATION; POLYATOMIC-MOLECULES; B3-SIGMA-U+ STATE; SCATTERING; COLLISIONS AB The complex Kohn variational method is employed in four-state close-coupling calculations to generate integral and differential cross sections for low-energy electron-impact excitation of the X 1SIGMA(g)+ --> (b 3SIGMA(u)+, a 3SIGMA(g)+, and c 3PI(u)) transitions in H2. The integral cross sections for excitation of the a 3SIGMA(g)+ and c 3PI(u) states from the ground state are found to be significantly different from earlier two-state calculations. The a 3SIGMA(g)+ cross sections are also larger than the most recent experimental results. This discrepancy is traced to the behavior of the differential cross sections at scattering angles near 0-degrees and 180-degrees, where measurements have not been carried out. The differential cross sections we find for H2 are strikingly similar to cross sections for analogous transitions in He. Previous theoretical studies of these transitions in He have also shown the two-state approximation to be inadequate. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP PARKER, SD (reprint author), OHIO STATE UNIV, DEPT CHEM, COLUMBUS, OH 43210 USA. NR 30 TC 42 Z9 43 U1 0 U2 0 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 APR 1 PY 1991 VL 43 IS 7 BP 3514 EP 3521 DI 10.1103/PhysRevA.43.3514 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FG216 UT WOS:A1991FG21600035 ER PT J AU TINSCHERT, K MULLER, A HOFMANN, G SALZBORN, E YOUNGER, SM AF TINSCHERT, K MULLER, A HOFMANN, G SALZBORN, E YOUNGER, SM TI ELECTRON-IMPACT SINGLE AND DOUBLE IONIZATION OF BA2+ AND BA3+ IONS SO PHYSICAL REVIEW A LA English DT Article ID EXPERIMENTAL CROSS-SECTIONS; PALLADIUM ISOELECTRONIC SEQUENCE; ENERGY-RESOLVED ELECTRONS; GIANT-RESONANCES; HEAVY-ATOMS; BA+; PHOTOABSORPTION; EXCITATION; CA+; PHOTOIONIZATION AB Experimental cross sections for single and double ionization of Ba2+ and Ba3+ ions are presented for an electron-impact energy range from threshold up to 1000 eV. By the alternative use of a "hot" electron-cyclotron-resonance ion source and a "cold" Penning ion source, beams of ions with and without metastable content could be employed. A fast energy-scanning technique with step widths of about 40 meV and an energy resolution of 0.4 eV revealed fine details in the cross sections, and in particular resonant contributions to single and double ionization could be observed. The data are interpreted on the basis of calculations of energy levels and distorted-wave calculations of direct ionization from various electron subshells. Influences of giant-resonance phenomena are discussed. C1 UNIV GIESSEN,INST KERNPHYS,W-6300 GIESSEN,GERMANY. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RI Muller, Alfred/A-3548-2009 OI Muller, Alfred/0000-0002-0030-6929 NR 51 TC 16 Z9 16 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR 1 PY 1991 VL 43 IS 7 BP 3522 EP 3534 DI 10.1103/PhysRevA.43.3522 PG 13 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FG216 UT WOS:A1991FG21600036 ER PT J AU PERERA, RCC COWAN, PL LINDLE, DW LAVILLA, RE JACH, T DESLATTES, RD AF PERERA, RCC COWAN, PL LINDLE, DW LAVILLA, RE JACH, T DESLATTES, RD TI MOLECULAR-ORBITAL STUDIES VIA SATELLITE-FREE X-RAY-FLUORESCENCE - CL K-ABSORPTION AND K-VALENCE-LEVEL EMISSION-SPECTRA OF CHLOROFLUOROMETHANES SO PHYSICAL REVIEW A LA English DT Article ID SYNCHROTRON RADIATION BEAMLINE; HIGH-ENERGY-RESOLUTION; PHOTOELECTRON-SPECTRA; SPECTROSCOPY; PERFORMANCE; REGION; CF2CL2; CH3CL AB X-ray absorption and emission measurements in the vicinity of the chlorine K edge of the three chlorofluoromethanes have been made using monochromatic synchrotron radiation as the source of excitation. By selectively tuning the incident radiation to just above the Cl 1s single-electron ionization threshold for each molecule, less complex x-ray-emission spectra are obtained. This reduction in complexity is attributed to the elimination of multielectron transitions in the Cl K shell, which commonly produce satellite features in x-ray emission. The resulting "satellite-free" x-ray-emission spectra exhibit peaks due only to electrons in valence molecular orbitals filling a single Cl 1s vacancy. These simplified emission spectra and the associated x-ray absorption spectra are modeled using straightforward procedures and compared with semiempirical ground-state molecular-orbital calculations. Good agreement is observed between the present experimental and theoretical results for valence-orbital energies and those obtained from ultraviolet photoemission, and between relative radiative yields determined both experimentally and theoretically in this work. C1 NATL INST STAND & TECHNOL,DIV QUANTUM METROL,GAITHERSBURG,MD 20899. RP PERERA, RCC (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 25 TC 26 Z9 26 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 APR 1 PY 1991 VL 43 IS 7 BP 3609 EP 3618 DI 10.1103/PhysRevA.43.3609 PG 10 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FG216 UT WOS:A1991FG21600047 ER PT J AU WANG, JY BURGDORFER, J BARANY, A AF WANG, JY BURGDORFER, J BARANY, A TI IONIZATION SPECTRUM FOR ION-ATOM COLLISIONS WITH ZERO-RANGED POTENTIALS IN ONE AND 3 DIMENSIONS SO PHYSICAL REVIEW A LA English DT Note ID DIFFERENTIAL CROSS-SECTIONS; CHARGE-TRANSFER; INTERMEDIATE ENERGIES; ELECTRON-EMISSION AB We analyze the exact ionization spectrum for ion-atom collisions with potentials of zero range in one and three dimensions. We find evidence for intrinsic three-body scattering effects in the continuum in the region of "upsilon/2 electrons" as well as at very high speeds. The relation of the position of the upsilon/2 "hump" to the motion of the improper saddle for the delta potential is discussed. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. MANNE SIEGBAHN INST,STOCKHOLM,SWEDEN. RP WANG, JY (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 29 TC 24 Z9 24 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR 1 PY 1991 VL 43 IS 7 BP 4036 EP 4039 DI 10.1103/PhysRevA.43.4036 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FG216 UT WOS:A1991FG21600090 ER PT J AU KOSTELECKY, VA NIETO, MM AF KOSTELECKY, VA NIETO, MM TI COMMENT ON ANALYTICAL WAVE-FUNCTIONS FOR ATOMIC QUANTUM-DEFECT THEORY - REPLY SO PHYSICAL REVIEW A LA English DT Letter ID GENERATING VALENCE; RYDBERG ORBITALS; PHENOMENOLOGICAL SUPERSYMMETRY; OSCILLATOR-STRENGTHS; PHYSICS; COULOMB AB The preceding paper, by Martin and Barrientos [Phys. Rev. A 43, 4061 (1991)], comments on our supersymmetry-inspired model of atomic physics. We relate this to other Comments [Rau, Phys. Rev. Lett. 56, 95 (1986) and Goodfriend, Phys. Rev. A 41, 1730 (1990)] and point out that, although the mathematics and physics of the 1974 Simons model [J. Chem. Phys. 60, 645 (1974)] is similar to ours, it is not identical. This is elucidated by explicitly comparing our symmetry-based approach to the more phenomenological approach of Martin and Barrientos. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP KOSTELECKY, VA (reprint author), INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47405, USA. NR 22 TC 4 Z9 4 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR 1 PY 1991 VL 43 IS 7 BP 4063 EP 4064 DI 10.1103/PhysRevA.43.4063 PG 2 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FG216 UT WOS:A1991FG21600099 ER PT J AU RAPHAELIAN, MLA BERRY, HG MANSOUR, NB SCHNEIDER, D AF RAPHAELIAN, MLA BERRY, HG MANSOUR, NB SCHNEIDER, D TI NONRESONANT TRANSFER AND EXCITATION IN NE6+-HE COLLISIONS AT INTERMEDIATE ENERGIES SO PHYSICAL REVIEW A LA English DT Note ID ION-ATOM COLLISIONS; DOUBLE-ELECTRON-CAPTURE; + HE COLLISIONS; RESONANT TRANSFER; HIGH-RESOLUTION; AR COLLISIONS; SINGLE-ELECTRON; SPECTROSCOPY; H-2; 2-ELECTRON AB High-resolution 0-degrees Auger spectroscopy has been used to study the Ne LMM and LMN Auger emission. The doubly excited states in B-like Ne are produced via nonresonant transfer and excitation (NTE) in collisions of 15- to 60-keV/amu Ne6+ incident on He. Line assignments are given for Auger transitions observed in the energy range between 20 and 100 eV, and capture into a triplet state is observed. The relative cross sections for these rates show a broad ( > 300 keV full width at half maximum) asymmetrical shape as a function of projectile energy, characteristic of the NTE process. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV HIGH TEMP PHYS,LIVERMORE,CA 94550. RP RAPHAELIAN, MLA (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 29 TC 0 Z9 0 U1 2 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR 1 PY 1991 VL 43 IS 7 BP 4071 EP 4074 DI 10.1103/PhysRevA.43.4071 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FG216 UT WOS:A1991FG21600103 ER PT J AU ANDERSSON, LR CEDERQUIST, H BARANY, A LILJEBY, L BIEDERMANN, C LEVIN, JC KELLER, N ELSTON, SB GIBBONS, JP KIMURA, K SELLIN, IA AF ANDERSSON, LR CEDERQUIST, H BARANY, A LILJEBY, L BIEDERMANN, C LEVIN, JC KELLER, N ELSTON, SB GIBBONS, JP KIMURA, K SELLIN, IA TI SIMULTANEOUS SINGLE-ELECTRON CAPTURE AND PROJECTILE-CORE EXCITATION ENHANCED THROUGH CONFIGURATION-INTERACTION IN VERY SLOW AR6+-HE COLLISIONS SO PHYSICAL REVIEW A LA English DT Note ID ENERGY-GAIN SPECTRA; OSCILLATOR-STRENGTHS; CROSS-SECTIONS; IONS; HE; SEQUENCE AB We report experimental angular differential cross sections for one-electron capture in Ar6+ - He collisions at very low energies (1.6 - 13 eV/u). The cross sections show an unexpectedly high population of core-excited states of Ar5+. An alternative mechanism for enhanced capture excitation through configuration interaction is proposed. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP ANDERSSON, LR (reprint author), MANNE SIEGBAHN INST PHYS,S-10405 STOCKHOLM,SWEDEN. NR 14 TC 19 Z9 19 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR 1 PY 1991 VL 43 IS 7 BP 4075 EP 4078 DI 10.1103/PhysRevA.43.4075 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FG216 UT WOS:A1991FG21600104 ER PT J AU HERMANN, MR CHAMBERS, DH DIXIT, SN KARR, TJ AF HERMANN, MR CHAMBERS, DH DIXIT, SN KARR, TJ TI UNIFIED THEORY OF SPONTANEOUS AND STIMULATED ROTATIONAL RAMAN-SCATTERING SO PHYSICAL REVIEW A LA English DT Note ID QUANTUM FLUCTUATIONS; FREQUENCY-CONVERSION; STOKES; GENERATION AB A general analytic theory of spontaneous and stimulated rotational Raman scattering is presented. This analytic description incorporates arbitrary polarization, time dependence, phase matching, and parametric coupling of the pump, Stokes, and anti-Stokes fields and the degeneracy of the rotational states. The analytic expressions for the time-dependent Stokes and anti-Stokes fields provide valuable physical insight into the dynamics of spontaneous and stimulated rotational Raman scattering. RP HERMANN, MR (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 23 TC 2 Z9 2 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR 1 PY 1991 VL 43 IS 7 BP 4079 EP 4082 DI 10.1103/PhysRevA.43.4079 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FG216 UT WOS:A1991FG21600105 ER PT J AU SVARE, I TORGESON, DR BORSA, F AF SVARE, I TORGESON, DR BORSA, F TI TUNNELING AND SPIN-LATTICE RELAXATION OF HYDROGEN DISSOLVED IN SCANDIUM METAL SO PHYSICAL REVIEW B LA English DT Article ID QUANTUM-MECHANICAL CALCULATIONS; TEMPERATURE-DEPENDENCE; NIOBIUM; YTTRIUM; DIFFUSION; PROTON; TANTALUM; SCATTERING; DEUTERIUM; NB(OH)X AB Some published NMR spin-lattice relaxation data for H in ScH(x) metal solid solutions below 100 K [Lichty et al., Phys. Rev. B 39, 2012 (1989)] have been reinterpreted in terms of local tunneling motion in two-well potentials rather than classical over-the-barrier hopping. The asymmetry A between the wells strongly influences the electron- and phonon-induced tunneling transition rates and also the intensity of the relaxation in the two-level system. The fit to the data uses distributions of A that broaden with increasing concentrations of H. For the local motion of H in Sc, we find the barrier V0/k(B) congruent-to 3200 K, the ground-state tunnel splitting DELTA-E(T0)/k(B) congruent-to 0.37 K, and coupling constants to electrons and phonons that have the same orders of magnitude as those for H in Nb. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. UNIV PAVIA,DEPT PHYS A VOLTA,I-27100 PAVIA,ITALY. RP SVARE, I (reprint author), UNIV TRONDHEIM,DEPT PHYS,N-7034 TRONDHEIM,NORWAY. NR 41 TC 16 Z9 16 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 7448 EP 7457 DI 10.1103/PhysRevB.43.7448 PN A PG 10 WC Physics, Condensed Matter SC Physics GA FE549 UT WOS:A1991FE54900009 ER PT J AU JANDL, S BANVILLE, M DUFOUR, P COULOMBE, S BOATNER, LA AF JANDL, S BANVILLE, M DUFOUR, P COULOMBE, S BOATNER, LA TI INFRARED STUDY OF OXYGEN VACANCIES IN KTAO3 SO PHYSICAL REVIEW B LA English DT Article ID RAMAN-SCATTERING; FERROELECTRIC MICROREGIONS; PHASE-TRANSITIONS; SPECTROSCOPY; STRESS; SRTIO3 AB The temperature dependence of the reflectance in the range 30-1500 cm-1, the transmission in the vicinity of 3500 cm-1, and the Raman spectrum at 15 K of high-purity KTaO3 are compared with the same properties of reduced KTaO3 with oxygen vacancies. Phonons at critical points in the Brillouin zone are observed, while disruption of the Ta-O-Ta chains in the reduced material generates at all temperatures an overdamping of the ferroelectric soft mode, which is no longer detectable. The analysis of the transmittance of both samples in the vicinity of the OH stretching-mode frequency supports the conclusion that an interaction exists between the OH radicals and the ferroelectric soft mode in the high-purity KTaO3 samples. C1 OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. RP JANDL, S (reprint author), UNIV SHERBROOKE, CTR RECH PHYS SOLIDE, SHERBROOKE J1K 2R1, QUEBEC, CANADA. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 33 TC 24 Z9 24 U1 1 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 7555 EP 7560 DI 10.1103/PhysRevB.43.7555 PN A PG 6 WC Physics, Condensed Matter SC Physics GA FE549 UT WOS:A1991FE54900020 ER PT J AU FLENSBERG, K JONSON, M AF FLENSBERG, K JONSON, M TI QUANTUM FLUCTUATIONS AND CHARGING EFFECTS IN SMALL TUNNEL-JUNCTIONS SO PHYSICAL REVIEW B LA English DT Article ID JOSEPHSON-JUNCTIONS; COULOMB BLOCKADE; SHOT NOISE; DYNAMICS; DISSIPATION AB The finite voltage conductance of an ultrasmall single tunnel junction of nominal resistance R0 is calculated within a model that includes quantum voltage fluctuations. Fluctuations are induced by charge transfer across the junction as well as by coupling to its electromagnetic environment via a transmission line of arbitrary impedance Z(omega). Both types of quantum fluctuations suppress the Coulomb blockade. Within a harmonic approximation we show that for a general frequency-dependent transmission-line impedance the impedances simply add in parallel. the low-frequency fluctuations are given by an effective coupling constant gamma-tot = R(H)/2Z(tot), where Z(tot)-1 = Z(O)-1 + R(O)-1 and R(H) = h/e2 is the quantum of resistance. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. CHALMERS UNIV TECHNOL,INST THEORET PHYS,S-41296 GOTHENBURG,SWEDEN. RP FLENSBERG, K (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. RI Jonson, Mats/D-6545-2011; Flensberg, Karsten/N-4718-2014 OI Flensberg, Karsten/0000-0002-8311-0103 NR 28 TC 16 Z9 16 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 7586 EP 7594 DI 10.1103/PhysRevB.43.7586 PN A PG 9 WC Physics, Condensed Matter SC Physics GA FE549 UT WOS:A1991FE54900025 ER PT J AU HAO, ZD CLEM, JR AF HAO, ZD CLEM, JR TI REVERSIBLE MAGNETIZATION AND TORQUES IN ANISOTROPIC HIGH-KAPPA TYPE-II SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Article ID CRITICAL-FIELD; LATTICE AB The reversible magnetization of anisotropic high-kappa type-II superconductors in an applied field H of arbitrary orientation with respect to the principal axes of the sample is considered in the framework of the Ginzburg-Landau theory with an anisotropic effective mass. We examine the procedure of obtaining the free-energy density F from its corresponding expression in the isotropic case by simply replacing the Ginzburg-Landau parameter kappa by a kappa-approximately that depends on the orientation of H relative to the principal axes. This procedure is valid when H is along one of the principal axes for arbitrary values of H between H(c1) and H(c2) and is also valid to a good approximation when H is not along one of the principal axes, but only when H >> H(c1). Because of the dependence of F on the orientation of H, when H is not parallel to one of the principal axes, the average magnetic-flux density B is not parallel to H, and a torque associated with the transverse magnetization exists, tending to orient the sample so that the value of kappa-approximately is the largest. Expressions for the magnetization and the torque are obtained from a variational model that permits the analytic calculation of F in the Ginzburg-Landau regime including, in addition to the supercurrent kinetic energy and the magnetic-field energy, the kinetic-energy and the condensation-energy terms arising from suppression of the order parameter in the vortex core. It is also pointed out that a comparison of the present theory with torque measurements can provide a way to estimate the upper critical field H(c2)(thet,phi), the thermodynamic field H(c), and the ratio m1:m2:m3 (m(i), i = 1,2,3, are the principal values of the effective-mass tensor m(ij)) in the temperature region where the Ginzburg-Landau theory is appropriate. C1 IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS, AMES, IA 50011 USA. RP HAO, ZD (reprint author), IOWA STATE UNIV SCI & TECHNOL, US DOE, AMES LAB, AMES, IA 50011 USA. NR 24 TC 49 Z9 49 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 7622 EP 7630 DI 10.1103/PhysRevB.43.7622 PN A PG 9 WC Physics, Condensed Matter SC Physics GA FE549 UT WOS:A1991FE54900028 ER PT J AU SWENSON, CA SHELTON, RN KLAVINS, P YANG, HD AF SWENSON, CA SHELTON, RN KLAVINS, P YANG, HD TI THERMAL-EXPANSION MEASUREMENTS FOR LU5IR4SI10, LU5RH4SI10, SC5IR4SI10, AND TM5IR4SI10 - CHARGE-DENSITY-WAVE EFFECTS SO PHYSICAL REVIEW B LA English DT Article ID SUPERCONDUCTING TERNARY SILICIDES; SC5CO4SI10-TYPE STRUCTURE; HEAT-CAPACITY; GERMANIDES; COPPER AB Linear-thermal-expansion measurements have determined the small relative length changes (DELTA-L/L almost-equal-to -10(-4)) at the charge-density-wave (CDW) transitions in Lu5Ir4Si10, Lu5Rh4Si10, and Tm5Ir4Si10. Tm5Ir4Si10 shows a second sluggish transition near 18 +/- 8 K which is comparable in magnitude. Thermal-expansivity measurements show that, for each material, significant changes occur in lattice properties on cooling through the CDW transition. Expansivity data above the low-temperature ordering transitions for these three (Lu5Ir4Si10, Lu5Rh4Si10 superconducting; Tm5Ir4Si10, magnetic) and also for Sc5Ir4Si10 (no CDW, but superconducting) in combination with previous C(p) results show unusual electronic behavior (large electronic contributions to alpha for all except Lu5Ir4Si10), a positive lattice expansivity only for Lu5Ir4Si10, and a very large lattice expansivity for Tm5Ir4Si10. The lattice Gruneisen parameters for the superconducting compounds show significant temperature dependence. A comparison of the pressure dependences of the superconducting transition temperatures (dT(c)/dP) as calculated from the discontinuities in alpha and C(p) and as determined in high-pressure experiments suggests a complex T(c)(P) behavior. The magnetic contributions to the expansivity of Tm5Ir4Si10 are consistent with different signs for dT(c)/dP for the 1.9-K ordering transition studied in these experiments and for the 0.86-K transition which has been observed in C(p) measurements. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP SWENSON, CA (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 12 TC 13 Z9 13 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 7668 EP 7675 DI 10.1103/PhysRevB.43.7668 PN A PG 8 WC Physics, Condensed Matter SC Physics GA FE549 UT WOS:A1991FE54900033 ER PT J AU PEREZGONZALEZ, A CLEM, JR AF PEREZGONZALEZ, A CLEM, JR TI ELECTROMAGNETIC RESPONSE OF A THIN TYPE-II SUPERCONDUCTING CYLINDRICAL-SHELL SO PHYSICAL REVIEW B LA English DT Article ID ROTATING MAGNETIC-FIELDS; HYSTERESIS LOSSES; AC LOSSES; DISKS; DIRECTION; VORTICES; WIRES AB The general critical-state model, which includes the effects of both flux-line cutting and flux pinning, is used for calculating the response of a type-II superconducting cylindrical shell subjected to applied magnetic fields that change in both magnitude and orientation. Analytic expressions for the ac losses are obtained for the case that the applied field has a small-amplitude oscillating component. For the regime of partial penetration of the changing B field, the ac-loss expression reduces, for large cylinder radius, to that in slab geometry. When full penetration occurs, the ac-loss expression depend upon the cylinder outer radius. C1 UNIV AUTONOMA PUEBLA,INST CIENCIAS,DEPT FIS,PUEBLA 72570,MEXICO. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. NR 26 TC 25 Z9 25 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 7792 EP 7799 DI 10.1103/PhysRevB.43.7792 PN A PG 8 WC Physics, Condensed Matter SC Physics GA FE549 UT WOS:A1991FE54900046 ER PT J AU CLEM, JR AF CLEM, JR TI 2-DIMENSIONAL VORTICES IN A STACK OF THIN SUPERCONDUCTING FILMS - A MODEL FOR HIGH-TEMPERATURE SUPERCONDUCTING MULTILAYERS SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC-PROPERTIES; II SUPERCONDUCTORS; COUPLING FORCE; CRITICAL-FIELD; TRANSITION; TC AB The structure of vortices within an infinite stack of thin superconducting layers is considered and examined in detail in the limit of zero interlayer Josephson coupling. The basic building block for the description of three-dimensional (3D) vortex lines is shown to be the 2D pancake vortex, which is a vortex located in only one of the layers; the other layers contain no vortices, but have an important effect in screening the magnetic field generated by currents in the first layer. It is shown that 3D vortex lines can be built up by superposing the contributions of stacks of 2D pancake vortices. Thermal excitation is shown to break up a single 3D vortex line at a temperature corresponding to the Kosterlitz-Thouless temperature of a single superconducting layer. The effect of thermally induced decoupling of the 2D vortex solids in different layers, corresponding to melting only in the direction perpendicular to the layers, is also considered. It is shown that Josephson coupling can be neglected in the high-temperature superconductors only under very stringent conditions. Although these conditions evidently are not met in Bi2Sr2CaCu2O8, and Tl2Ba2Ca1Cu2O8, they should be satisfied in superconducting-insulating multilayer systems, such as YBa2Cu3O7-delta/PrBa2Cu3O7-delta. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP CLEM, JR (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 55 TC 784 Z9 784 U1 3 U2 31 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 7837 EP 7846 DI 10.1103/PhysRevB.43.7837 PN A PG 10 WC Physics, Condensed Matter SC Physics GA FE549 UT WOS:A1991FE54900051 ER PT J AU HERR, SL KAMARAS, K TANNER, DB CHEONG, SW STEWART, GR FISK, Z AF HERR, SL KAMARAS, K TANNER, DB CHEONG, SW STEWART, GR FISK, Z TI INFRARED PROPERTIES OF T'-PHASE R2CUO4 INSULATING COMPOUNDS SO PHYSICAL REVIEW B LA English DT Article ID LA2CUO4; SUPERCONDUCTIVITY; CARRIERS; CRYSTALS; ND2CUO4; SPECTRA AB Reflectance studies on single crystals of a series of rare-earth (R = Pr, Nd, Sm, Gd) copper oxides have been made to determine phonon frequencies as a function of rare-earth mass. The increase in interatomic force constants with increasing rare-earth mass, which leads to a reduction in the lattice parameters, increases the vibrational frequencies. In addition, the change from the T-phase La2CuO4 to the T'-phase R2CuO4 crystal structure causes changes in the phonon frequencies that are due both to the changing lattice parameters and to the relocation of the apical oxygen atoms. C1 HUNGARIAN ACAD SCI,CENT RES INST PHYS,H-1525 BUDAPEST,HUNGARY. UNIV FLORIDA,DEPT PHYS,GAINESVILLE,FL 32611. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544. RP HERR, SL (reprint author), VIRGINIA COMMONWEALTH UNIV,DEPT PHYS,RICHMOND,VA 23284, USA. RI Kamaras, Katalin/A-3916-2009 OI Kamaras, Katalin/0000-0002-0390-3331 NR 21 TC 12 Z9 12 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 7847 EP 7851 DI 10.1103/PhysRevB.43.7847 PN A PG 5 WC Physics, Condensed Matter SC Physics GA FE549 UT WOS:A1991FE54900052 ER PT J AU LIU, L KOUVEL, JS BRUN, TO AF LIU, L KOUVEL, JS BRUN, TO TI DIRECTIONAL VORTEX-FLUX BIFURCATION IN POLYCRYSTALLINE YBA2CU3O7 ROTATED IN A MAGNETIC-FIELD SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; BA-CU-O; GLASS; CREEP; IRREVERSIBILITY; CRYSTALS AB Magnetization-vector measurements on a field-cooled polycrystalline sample of YBa2Cu3O7 rotated in a magnetic field H at 4.2 K reveal an extraordinary behavior of M(P), the penetrating (vortex-flux) component of the magnetization. Near H = 0.8 kOe, as theta the sample-rotation angle relative to H is raised from zero to 360-degrees, the magnitude of M(P) descends to a small minimum at theta almost-equal-to 205-degrees, and then again at theta almost-equal-to 155-degrees, as theta is lowered back to 0-degrees. At each minimum, the direction of M(P) changes very rapidly. For H at a critical value, the minimum M(P) reaches zero and its direction changes abruptly by 180-degrees. This behavior signifies a separation of the vortex lines into two groups, one of which rotates rigidly with the sample, while the other maintains a range of orientations extending from that of H and thus rotates frictionally relative to the sample. The proportion of vortex lines in each group varies systematically with H. This directional vortex-flux bifurcation can readily arise from a broad distribution in the strength of the vortex-pinning forces. Simple model calculations based on this premise give excellent qualitative agreement with experiment. C1 UNIV CALIF LOS ALAMOS SCI LAB,P-LANSCE,LOS ALAMOS,NM 87545. RP LIU, L (reprint author), UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60680, USA. NR 19 TC 20 Z9 20 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 7859 EP 7865 DI 10.1103/PhysRevB.43.7859 PN A PG 7 WC Physics, Condensed Matter SC Physics GA FE549 UT WOS:A1991FE54900054 ER PT J AU MCCARTY, KF SCHIRBER, JE CHEONG, SW FISK, Z AF MCCARTY, KF SCHIRBER, JE CHEONG, SW FISK, Z TI SUPERCONDUCTING LA2CUO4+X PREPARED BY OXYGENATION AT HIGH-PRESSURE - A RAMAN-SCATTERING STUDY SO PHYSICAL REVIEW B LA English DT Article ID RAY PHOTOELECTRON-SPECTROSCOPY; INELASTIC LIGHT-SCATTERING; HIGH-TC SUPERCONDUCTIVITY; SPIN FLUCTUATIONS; CRYSTAL-STRUCTURE; SINGLE-CRYSTALS; SUPEROXIDE; DYNAMICS; PHASE; IDENTIFICATION AB Superconducting crystals of La2CuO4+x prepared by high-pressure oxygenation have been analyzed by Raman spectroscopy. A direct comparison of the role of excess oxygen was made by examining the same crystals with and without excess oxygen. La2CuO4+x, like nonsuperconducting La2CuO4.0, is found to have a soft phonon associated with a tetragonal-to-orthorhombic phase transition. The A(g) phonons of La2CuO4.0 and La2CuO4+x occur at essentially the same frequency. At room temperature, La2CuO4+x has no well-defined peak from two-magnon scattering, unlike La2CuO4.0. However, in its phase-separated from, La2CuO4+x exhibits well-defined, two-magnon scattering. This establishes that the La2CuO4.0 phase present in La2CuO4+x at low temperatures is antiferromagnetic. La2CuO4+x samples prepared by slightly different methods are found to have differing amounts of excess oxygen, as indicated by variations in the intensity of the phonon and magnetic scattering. Certain samples of La2CuO4+x had a phonon peak at 630 cm-1 that is absent in La2CuO4.0. While a definitive assignment is not possible, the frequency of this peak is consistent with a peroxidelike species in La2CuO4+x. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. 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 31 TC 18 Z9 18 U1 2 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 7883 EP 7890 DI 10.1103/PhysRevB.43.7883 PN A PG 8 WC Physics, Condensed Matter SC Physics GA FE549 UT WOS:A1991FE54900058 ER PT J AU SODERHOLM, L LOONG, CK GOODMAN, GL DABROWSKI, BD AF SODERHOLM, L LOONG, CK GOODMAN, GL DABROWSKI, BD TI CRYSTAL-FIELD SPLITTINGS AND MAGNETIC-PROPERTIES OF PR3+ AND ND3+ IN RBA2CU3O7 SO PHYSICAL REVIEW B LA English DT Article ID SINGLE-PHASE Y1-XPRXBA2CU3O7-DELTA; NORMAL-STATE PROPERTIES; ELECTRIC-FIELD; SUPERCONDUCTING PROPERTIES; NEUTRON-SCATTERING; COPPER OXIDES; 90 K; PRBA2CU3O7; SM; HOBA2CU3O7-DELTA AB Neutron inelastic scattering spectra are reported for superconducting NdBa2Cu3O7 and insulating PrBa2Cu3O7. These spectra are analyzed in terms of standard crystal-field theory for 3+ rare-earth ions in a manner that is consistent with the level assignments made in a similar study of HoBa2Cu3O7. Using the eigenfunctions and eigenvalues obtained from this analysis of the inelastic neutron scattering spectra, the corresponding magnetic susceptibilities as a function of temperature were calculated according to the van Vleck formalism. Good agreement with experimental susceptibilities is achieved for all three compounds over the range of 100 to 300 K. The observed magnetic scattering in NdBa2Cu3O7 agrees very well with the crystal-field calculations. In spite of the observed large intrinsic widths of the experimental crystal-field peaks for PrBa2Cu3O7, the measured intensity is consistent with the calculated crystal-field excitation spectrum for Pr3+ ions in this lattice. The standard crystal-field treatment of Pr3+ ions is shown to explain the magnetic properties of PrBa2Cu3O7 with no need to consider either the static or dynamic coexistence of Pr3+ and Pr4+. RP SODERHOLM, L (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 57 TC 162 Z9 162 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 7923 EP 7935 DI 10.1103/PhysRevB.43.7923 PN A PG 13 WC Physics, Condensed Matter SC Physics GA FE549 UT WOS:A1991FE54900062 ER PT J AU FALO, F BISHOP, AR LOMDAHL, PS HOROVITZ, B AF FALO, F BISHOP, AR LOMDAHL, PS HOROVITZ, B TI LANGEVIN MOLECULAR-DYNAMICS OF INTERFACES - NUCLEATION VERSUS SPIRAL GROWTH SO PHYSICAL REVIEW B LA English DT Article ID CHARGE-DENSITY WAVES; PLANAR MODEL; GENERATION; TRANSITION; VORTICES; SYSTEMS AB A simulation of surface growth is reported that directly introduces dynamics and thermal noise within a classical Langevin molecular-dynamics scheme. Using recent advances in massively parallel computation, extensive simulations on large two-dimensional lattices are possible. Surface growth is modeled by a dynamic solid-on-solid model, analogous to a discrete two-dimensional sine-Gordon equation. The influence of both homogeneous (thermal) nucleation and Frank-Read sources of spiral growth patterns are incorporated and compared. A phase diagram is described in the space of temperature and chemical potential difference between surface and vapor. At sufficiently high temperatures, a surface-roughening transition occurs. Finally, the same model is applied to other two-dimensional contexts: charge-density-wave materials in an electric field, and a two-dimensional Josephson junction in a perpendicular current. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV CALIF LOS ALAMOS SCI LAB,ADV COMP LAB,LOS ALAMOS,NM 87545. BEN GURION UNIV NEGEV,DEPT PHYS,IL-84105 BEER SHEVA,ISRAEL. RI Falo, Fernando/B-9137-2011; HOROVITZ, BARUCH/F-1697-2012 OI Falo, Fernando/0000-0002-9551-624X; NR 23 TC 34 Z9 34 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 8081 EP 8088 DI 10.1103/PhysRevB.43.8081 PN A PG 8 WC Physics, Condensed Matter SC Physics GA FE549 UT WOS:A1991FE54900080 ER PT J AU BASA, P SCHON, JC BERRY, RS BERNHOLC, J JELLINEK, J SALAMON, P AF BASA, P SCHON, JC BERRY, RS BERNHOLC, J JELLINEK, J SALAMON, P TI SHAPES OF WETTED SOLIDS AND SINTERS SO PHYSICAL REVIEW B LA English DT Article AB The first stage of wetting of porous media and sintering of powders is characterized by the condition that the wetted contact regions between the constituent particles do not overlap, thus reducing the global problem to a set of independent local problems. The local problem can often be approximated by the wetting and/or sintering of overlapping spheres of different sizes. The last problem has axial symmetry and can conveniently be modeled as the wetting of solid cores by a local mobile pool. We have developed a wetting algorithm which determines the shape of the contacts, assuming the separability of the time scales between the local equilibration of neck shapes between the particles (fast) and the supply of liquid material by various diffusive processes (slow). The algorithm minimizes the free energy of the system, subject to the constraint of a fixed liquid volume. The problem may be naturally divided into several cases, and we present efficient numerical procedures for calculating neck shapes for each case. C1 UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637. UNIV CHICAGO,JAMES FRANCK INST,CHICAGO,IL 60637. N CAROLINA STATE UNIV,DEPT PHYS,RALEIGH,NC 27695. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP BASA, P (reprint author), SAN DIEGO STATE UNIV,DEPT MATH SCI,SAN DIEGO,CA 92182, USA. NR 19 TC 8 Z9 8 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 8113 EP 8122 DI 10.1103/PhysRevB.43.8113 PN B PG 10 WC Physics, Condensed Matter SC Physics GA FE551 UT WOS:A1991FE55100002 ER PT J AU PECHARSKY, VK GSCHNEIDNER, KA AF PECHARSKY, VK GSCHNEIDNER, KA TI CECO0.89GE2 - A HEAVY-FERMION SYSTEM SO PHYSICAL REVIEW B LA English DT Article ID INTERCONFIGURATION AB The low-temperature (1.3-20 K) high-magnetic-field (0-10 T) heat capacity and magnetic susceptibility (1.5-300 K) of the CeCo0.89Ge2 and LaCo0.96Ge2 compounds have been measured. LaCo0.96Ge2 exhibits normal metallic behavior, while the cerium-containing compound shows (1) an enhanced value of zero-field electronic-specific-heat coefficient [gamma = 128 mJ/mol(Ce) K2], which increases significantly in high magnetic fields; (2) the absence of magnetic ordering down to 1.5 K; (3) a large and negative value of paramagnetic Curie temperature (-95.9 K); and (4) a large magnetic susceptibility at low temperature (9 X 10(-3) emu/mol at 1.7 K). All of these properties are evidence of high density of states at the Fermi level in CeCo0.89Ge2. Neither compound is superconducting down to 1.3 K, nor do they order magnetically. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. LVOV STATE UNIV,DEPT INORGAN CHEM,LVOV 290005,UKRAINE,USSR. RP PECHARSKY, VK (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 17 TC 16 Z9 16 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 8238 EP 8244 DI 10.1103/PhysRevB.43.8238 PN B PG 7 WC Physics, Condensed Matter SC Physics GA FE551 UT WOS:A1991FE55100017 ER PT J AU RICKMAN, JM VINALS, J SEKERKA, RF AF RICKMAN, JM VINALS, J SEKERKA, RF TI MOLECULAR-DYNAMICS STUDY OF THE EFFECTS OF STRAIN ON INTERSTITIAL DIFFUSION IN A HARD-SPHERE MODEL OF A BINARY CRYSTALLINE SOLID SO PHYSICAL REVIEW B LA English DT Article ID STRESS AB We examine quantitatively the effects on tracer diffusion of both externally applied strains and internal strains generated by large interstitial particles dissolved in a coherent hard-sphere crystal. The molecular-dynamics method, generalized to permit elastic deformations of a system, is used to simulate the diffusion of interstitials in a binary hard-sphere solid. A tracer-diffusion response function E(k) is calculated from a tracer density-density correlation function. The associated diffusivity D is found to be independent of crystallographic orientation at long wavelengths. The simulation results are further interpreted by using a multiclass master equation to describe particle transitions and by using elasticity theory. The diffusivity obtained can be characterized very accurately by an activation entropy that is proportional to the square of the radius of an interstitial. Finally, the application of an external strain can modify the symmetry of the lattice, and the diffusion tensor associated with the deformed lattice must be modified in a manner consistent with elastodiffusion theory. C1 FLORIDA STATE UNIV,SUPERCOMP COMPUTAT RES INST,TALLAHASSEE,FL 32306. CARNEGIE MELLON UNIV,DEPT PHYS,PITTSBURGH,PA 15213. CARNEGIE MELLON UNIV,DEPT MATH,PITTSBURGH,PA 15213. RP RICKMAN, JM (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Vinals, Jorge/J-6198-2016 OI Vinals, Jorge/0000-0002-9361-0646 NR 19 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 APR 1 PY 1991 VL 43 IS 10 BP 8251 EP 8263 DI 10.1103/PhysRevB.43.8251 PN B PG 13 WC Physics, Condensed Matter SC Physics GA FE551 UT WOS:A1991FE55100019 ER PT J AU TOULOUSE, J WANG, XM KNAUSS, LA BOATNER, LA AF TOULOUSE, J WANG, XM KNAUSS, LA BOATNER, LA TI DIELECTRIC NONLINEARITY AND SPONTANEOUS POLARIZATION OF KTA1-XNBXO3 IN THE DIFFUSE TRANSITION RANGE SO PHYSICAL REVIEW B LA English DT Article ID SPIN-GLASS; PHASE-TRANSITION; BEHAVIOR; FREQUENCY AB KTa(1-x)Nb(x)O3 (KTN) in an intermediate-concentration range (x = 15.7%) has been studied using dielectric-constant and spontaneous-polarization measurements. A large peak in the dielectric constant (epsilon-max congruent-to 70 000) is observed at the temperature T(c)*. From room temperature down to T(c)* + 20 K, epsilon obeys a Curie-Weiss law with T0 approximately 142.3 K. Below, epsilon deviates from this law and P-E hysteresis loops are observed. These results indicate that the phase transition exhibits a diffuse character which is related to the appearance of microscopic polarized regions or cells. The epsilon peak at T(c)* exhibits a cusp shape and becomes flattened upon application of low dc-bias fields. A corresponding dielectric loss peak is also observed, the position of which reveals the relaxational character of the transition. Through measurements of epsilon(E,T) for different dc-bias fields, we have characterized the dielectric nonlinearities in the transition range; the first nonlinear coefficient, epsilon-(2), diverges in two distinct ranges, as (T - T(c)*)-n, with n approximately 9 initially and with n congruent-to 2 closer to T(c)*. These results suggest that diffuse phase transitions in mixed ferroelectrics are due to the ordering of polar cells modified by mutual strain interactions. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP TOULOUSE, J (reprint author), LEHIGH UNIV,DEPT PHYS,BETHLEHEM,PA 18015, USA. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 20 TC 33 Z9 33 U1 1 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 8297 EP 8302 DI 10.1103/PhysRevB.43.8297 PN B PG 6 WC Physics, Condensed Matter SC Physics GA FE551 UT WOS:A1991FE55100025 ER PT J AU RUCKMAN, MW QIU, SL CHEN, J STRONGIN, M AF RUCKMAN, MW QIU, SL CHEN, J STRONGIN, M TI NEAR-EDGE STUDY OF MOLECULAR-OXYGEN AND NITROGEN CLUSTERS ON A KRYPTON SURFACE SO PHYSICAL REVIEW B LA English DT Note ID SHELL PHOTOABSORPTION; MAGNETIC-STRUCTURE; SOLID OXYGEN; CO; O2; EXCITATIONS; DYNAMICS; SPECTRA; N-2; N2O AB N2 or O2 clusters are condensed on Kr films at 20 K, and the K edge is studied using synchrotron radiation. For molecular nitrogen, little or no change is observed in the near-edge structure as one goes from the small cluster to the thin-film limit. For molecular oxygen, an increase is observed in the splitting of the sigma* feature with increasing oxygen coverage. We attribute this phenomenon to local structural and electronic changes related to cluster growth. The splitting of the sigma* feature for the smallest amount of oxygen deposited is larger than the gas-phase value, and we believe this latter result is due to the formation of molecular-oxygen dimers. RP RUCKMAN, MW (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 30 TC 7 Z9 7 U1 2 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 8603 EP 8605 DI 10.1103/PhysRevB.43.8603 PN B PG 3 WC Physics, Condensed Matter SC Physics GA FE551 UT WOS:A1991FE55100060 ER PT J AU EMIN, D AF EMIN, D TI ADDITIONAL SHORT-WAVELENGTH VIBRATORY MODES FROM A LARGE (BI)POLARON SO PHYSICAL REVIEW B LA English DT Note ID SUPERCONDUCTIVITY AB The internal intersite motions of the self-trapped carriers of large (bi)polarons locally soften the vibrational modes to which they are coupled. Distinctively, this effect only occurs for phonon half wavelengths that are shorter than the diameter of the self-trapped carrier. With sufficiently strong electron-lattice coupling, distinct extra lower-frequency near replicas of the short-wavelength portion of the vibrational modes result. This unusual effect is consistent with observations in high-T(c) superconductors. RP EMIN, D (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 9 TC 17 Z9 17 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 8610 EP 8612 DI 10.1103/PhysRevB.43.8610 PN B PG 3 WC Physics, Condensed Matter SC Physics GA FE551 UT WOS:A1991FE55100062 ER PT J AU BOURGES, P GEHRING, PM HENNION, B MOUDDEN, AH TRANQUADA, JM SHIRANE, G SHAMOTO, S SATO, M AF BOURGES, P GEHRING, PM HENNION, B MOUDDEN, AH TRANQUADA, JM SHIRANE, G SHAMOTO, S SATO, M TI SPECTRAL SHIFT OF THE MAGNETIC CROSS-SECTION IN SUPERCONDUCTING YBA2CU3O6+X SO PHYSICAL REVIEW B LA English DT Note ID EXCITATIONS; FLUCTUATIONS; NMR; TC AB A triple-axis neutron-scattering study has been done of the magnetic correlations in three large single crystals of YBa2Cu3O6+x with x = 0.5, 0.8, and 0.9 having T(c)'s of 50, 60, and 80 K, respectively. The frequency dependence of the cross section at Q = (1/2, 1/2, l) was found to peak near 5 meV for x = 0.45 in an earlier study. Our data confirm that this peak shifts to approximately 30 meV for x = 0.5. Moreover, the low-frequency (< 40 meV) spectra for x = 0.8 and 0.9 become progressively suppressed with respect to those of the less oxygenated samples. These data are consistent with a picture in which the spectral weight of the magnetic scattering shifts to higher energy as the oxygen concentration x and carrier density increase. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. NAGOYA UNIV,NAGOYA 46401,JAPAN. RP BOURGES, P (reprint author), CENS,LAB LEON BRILLOUIN,F-91191 GIF SUR YVETTE,FRANCE. RI Tranquada, John/A-9832-2009; OI Tranquada, John/0000-0003-4984-8857; Gehring, Peter/0000-0002-9236-2046 NR 13 TC 42 Z9 42 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 8690 EP 8693 DI 10.1103/PhysRevB.43.8690 PN B PG 4 WC Physics, Condensed Matter SC Physics GA FE551 UT WOS:A1991FE55100089 ER PT J AU COLLINS, RT SCHLESINGER, Z HOLTZBERG, F FEILD, C WELP, U CRABTREE, GW LIU, JZ FANG, Y AF COLLINS, RT SCHLESINGER, Z HOLTZBERG, F FEILD, C WELP, U CRABTREE, GW LIU, JZ FANG, Y TI DYNAMIC PROPERTIES OF A HIGH-TC SUPERCONDUCTOR - DIRECT EVIDENCE FOR NON-BCS BEHAVIOR SO PHYSICAL REVIEW B LA English DT Note ID MAGNETIC PENETRATION DEPTH; YBA2CU3O7 AB Measurements of the temperature dependence of the infrared conductivity of the CuO2 planes in YBa2Cu3O7 in the superconducting state are reported. Remarkably, we find that the temperature dependence of sigma-1(omega, T) is independent of omega for omega less-than-or-approximately 500 cm-1, and that it is the same as that of the nuclear Korringa product, 1/T1T. These observations indicate that for the best-characterized high-temperature superconductor, YBa2Cu3O7, the phenomenology of dynamic properties is fundamentally different from that of conventional superconductors. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP COLLINS, RT (reprint author), IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598, USA. RI Collins, Reuben/O-2545-2014 OI Collins, Reuben/0000-0001-7910-3819 NR 19 TC 63 Z9 63 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 8701 EP 8704 DI 10.1103/PhysRevB.43.8701 PN B PG 4 WC Physics, Condensed Matter SC Physics GA FE551 UT WOS:A1991FE55100092 ER PT J AU GOLDMAN, AI STASSIS, C BELLISSENT, R MOUDDEN, H PYKA, N GAYLE, FW AF GOLDMAN, AI STASSIS, C BELLISSENT, R MOUDDEN, H PYKA, N GAYLE, FW TI INELASTIC-NEUTRON-SCATTERING MEASUREMENTS OF PHONONS IN ICOSAHEDRAL AL-LI-CU SO PHYSICAL REVIEW B LA English DT Note ID QUASICRYSTAL AB Inelastic-neutron-scattering measurements on a single grain of icosahedral Al-Li-Cu are presented. Within experimental error the acoustic-phonon dispersion at small, but finite, q is independent of direction, confirming the isotropic elasticity expected for icosahedral crystals. By following the longitudinal-phonon dispersion curve along a fivefold axis we can identify the location of a "quasi-Brillouin-zone boundary." The measurements also suggest the presence of an optical or localized mode along the twofold axis at approximately 10-11 meV. We compare these results to theoretical calculations for one- and two-dimensional quasiperiodic systems. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. CENS,LAB LEON BRILLOUIN,F-91191 GIF SUR YVETTE,FRANCE. NIST,DIV MET,GAITHERSBURG,MD 20899. RP GOLDMAN, AI (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 12 TC 35 Z9 35 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 APR 1 PY 1991 VL 43 IS 10 BP 8763 EP 8766 DI 10.1103/PhysRevB.43.8763 PN B PG 4 WC Physics, Condensed Matter SC Physics GA FE551 UT WOS:A1991FE55100108 ER PT J AU WIRINGA, RB AF WIRINGA, RB TI VARIATIONAL CALCULATIONS OF FEW-BODY NUCLEI SO PHYSICAL REVIEW C LA English DT Article ID BINDING-ENERGY; FORM-FACTORS; MATTER; 3-BODY; STATE AB Improved variational wave functions for use in microscopic studies of few-body nuclei are presented. The trial functions are constructed from pair-correlation operators, which include central, spin, isospin, tensor, and spin-orbit components, and triplet-correlation operators, which include components induced by three-nucleon potentials. Energy expectation values are calculated using Metropolis Monte Carlo integration. Variational parameter searches are made using energy differences to reduce the effect of statistical fluctuations on the choice of optimal trial functions. Results are reported for ground-state binding energies of H-3 and He-4 using the Reid upsilon-8 and Argonne upsilon-14 two-nucleon potentials, and Argonne upsilon-14 with the Tucson-Melbourne, Urbana VII, and Urbana VIII three-nucleon potentials. The variational binding energies are typically 3-4% above available Faddeev and Green's-function Monte Carlo results. Nucleon density distributions and elastic electromagnetic form factors are also presented. Extension of these wave functions to larger nuclei such as He-5, He-6, and Li-6 is discussed. RP WIRINGA, RB (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. RI Wiringa, Robert/M-4970-2015 NR 26 TC 159 Z9 159 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD APR PY 1991 VL 43 IS 4 BP 1585 EP 1598 DI 10.1103/PhysRevC.43.1585 PG 14 WC Physics, Nuclear SC Physics GA FF991 UT WOS:A1991FF99100013 ER PT J AU BERANT, Z SCHUHMANN, RB ALBURGER, DE CHOU, WT GILL, RL WARBURTON, EK WESSELBORG, C AF BERANT, Z SCHUHMANN, RB ALBURGER, DE CHOU, WT GILL, RL WARBURTON, EK WESSELBORG, C TI SPECTROSCOPY OF BI-214 AND SYSTEMATICS OF PB-210, PB-212, PB-214 (O+)-]BETA- BI-210, BI-212, BI-214(O-) SO PHYSICAL REVIEW C LA English DT Article ID PICOSECOND LIFETIME MEASUREMENTS; NEUTRON-RICH NUCLEI; GAMMA-RAY ENERGIES; DECAY; TRANSITION AB Experiments designed to provide more information on the spectroscopy of Bi-214, and on Pb-214(beta-)Bi-214 in particular, were undertaken because of interest in first-forbidden beta decay in the lead region. The experiments consisted of gamma-gamma coincidences and angular correlations, conversion electron measurements, level lifetime determinations, and precision gamma-ray energy measurements. The 352-keV level of Bi-214 was found to be a strong candidate (and the only candidate) for the 0(1)- state. Recent additions to the Pb-214 decay scheme are confirmed by gamma-gamma coincidence measurements. A careful evaluation of the Bi-214 level scheme is made with emphasis on separating experimentally based conclusions from speculations based on systematics and other "weak" arguments. Shell-model calculations of the spectroscopy of Bi-210, Bi-212 and Pb-210, Pb-212(beta-)Bi-210, Bi-212 were performed using a modification of the Kuo-Herling realistic interaction. These calculations and a generalized seniority model provide a basis for an examination of the systematics of the A = 210, 212, 214 spectroscopy and beta decay. The generalized seniority model is found to be a quite good approximation which provides a quantitative understanding of the Pb-214 decay rates. C1 CLARK UNIV,WORCESTER,MA 01610. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. UNIV GIESSEN,W-6300 GIESSEN,GERMANY. NUCL RES CTR NEGEV,IL-84190 BEER SHEVA,ISRAEL. RP BERANT, Z (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 45 TC 3 Z9 3 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD APR PY 1991 VL 43 IS 4 BP 1639 EP 1655 DI 10.1103/PhysRevC.43.1639 PG 17 WC Physics, Nuclear SC Physics GA FF991 UT WOS:A1991FF99100018 ER PT J AU GLOVER, CW FOSTER, CC SCHWANDT, P COMFORT, JR RAPAPORT, J TADDEUCCI, TN WANG, D WAGNER, GJ SEUBERT, J CARPENTER, AW CARR, JA PETROVICH, F PHILPOTT, RJ THREAPLETON, MJ AF GLOVER, CW FOSTER, CC SCHWANDT, P COMFORT, JR RAPAPORT, J TADDEUCCI, TN WANG, D WAGNER, GJ SEUBERT, J CARPENTER, AW CARR, JA PETROVICH, F PHILPOTT, RJ THREAPLETON, MJ TI SCATTERING OF POLARIZED PROTONS FROM LI-7 AT 200 MEV SO PHYSICAL REVIEW C LA English DT Article ID CHARGE FORM-FACTOR; ELECTRON-SCATTERING; MOMENTUM-TRANSFER; FOLDING MODEL; LIGHT-NUCLEI; STATE; POTENTIALS; DEPENDENCE; TARGETS; NEUTRON AB New cross-section and analyzing-power data are presented for elastic and inelastic scattering of 200-MeV protons from Li-7, which has a 3/2-, T = 1/2 ground state. A microscopic folding-model optical potential, obtained by convoluting a Pauli-corrected effective nucleon-nucleon (NN) interaction with Li-7 ground-state densities constrained by weak and electromagnetic data, produces a satisfactory description of the elastic data. The effects of the nonspherical terms in the optical potential, estimated via the distorted-wave approximation (DWA), are appreciable. The inelastic transitions leading to the 1/2-, T = 1/2 and 7/2-, T = 1/2 states at 0.48 and 4.63 MeV, respectively, are also examined within the framework of the microscopic folding model and the DWA. Transition potentials are generated by convoluting the effective NN interaction considered with target transition densities constrained by weak, electromagnetic, and low-energy proton and neutron scattering data. These potentials are employed in DWA calculations along with the folded optical potential that is consistent with the transition potentials. These self-consistent calculations also provide a good description of the inelastic data. The results provide a clear indication that there are important shape differences between the Li-6 and Li-7 radial densities and that the two inelastic transitions in Li-7, which are primarily quadrupole in character, have rho-2n(m)/rho-2p(m) almost-equal-to 0.9 and 0.9-1.2, respectively. C1 INDIANA UNIV,CYCLOTRON FACIL,BLOOMINGTON,IN 47405. ARIZONA STATE UNIV,DEPT PHYS,TEMPE,AZ 85287. OHIO UNIV,DEPT PHYS,ATHENS,OH 45701. UNIV TUBINGEN,INST PHYS,W-7400 TUBINGEN 1,GERMANY. INDIANA UNIV PURDUE UNIV,DEPT PHYS,INDIANAPOLIS,IN 46223. FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306. FLORIDA STATE UNIV,SUPERCOMP COMPUTAT RES INST,TALLAHASSEE,FL 32306. RP GLOVER, CW (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 58 TC 20 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 APR PY 1991 VL 43 IS 4 BP 1664 EP 1676 DI 10.1103/PhysRevC.43.1664 PG 13 WC Physics, Nuclear SC Physics GA FF991 UT WOS:A1991FF99100020 ER PT J AU GLICKMAN, JP BERTOZZI, W BUTI, TN DIXIT, S HERSMAN, FW HYDEWRIGHT, CE HYNES, MV LOURIE, RW NORUM, BE KELLY, JJ BERMAN, BL MILLENER, DJ AF GLICKMAN, JP BERTOZZI, W BUTI, TN DIXIT, S HERSMAN, FW HYDEWRIGHT, CE HYNES, MV LOURIE, RW NORUM, BE KELLY, JJ BERMAN, BL MILLENER, DJ TI ELECTRON-SCATTERING FROM BE-9 SO PHYSICAL REVIEW C LA English DT Article ID 1ST EXCITED-STATE; ELECTROEXCITATION; C-13; TRANSITIONS; NUCLEI; DECAY; O-16 AB The structure of Be-9 is investigated using electron scattering measurements at 90-degrees and 160-degrees for momentum transfers between about 1.0 and 2.5 fm-1. In addition to the 3/2- ground state and the narrow 5/2- state at 2.43 MeV, detailed line-shape analysis was used to extract cross sections for broad states at 1.68, 3.05, 4.70, 6.38, 6.76, 11.28, and 13.79 MeV. The previously unknown state at 6.38 MeV was isolated from the known 6.76 MeV state in both (e,e') and (p,p') data using the dependence of peak position upon momentum transfer. On the basis of the form factor, the 6.38 MeV state replaces the 6.76 MeV state as the 7/2- member of the ground-state rotational band and the 6.76 MeV state is identified with the lowest 9/2+ state predicted by the shell model. The data for all states are compared with a shell-model calculation that uses the full 0h-omega and 1h-omega model spaces. Calculations are also presented for the narrow states between 14 and 18 MeV excitation. C1 MIT,NUCL SCI LAB,CAMBRIDGE,MA 02139. UNIV MARYLAND,DEPT PHYS & ASTRON,COLLEGE PK,MD 20742. GEORGE WASHINGTON UNIV,DEPT PHYS,WASHINGTON,DC 20052. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP GLICKMAN, JP (reprint author), MIT,DEPT PHYS,CAMBRIDGE,MA 02139, USA. NR 45 TC 51 Z9 51 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 APR PY 1991 VL 43 IS 4 BP 1740 EP 1757 DI 10.1103/PhysRevC.43.1740 PG 18 WC Physics, Nuclear SC Physics GA FF991 UT WOS:A1991FF99100027 ER PT J AU DIXIT, S BERTOZZI, W BUTI, TN FINN, JM HERSMAN, FW HYDEWRIGHT, CE HYNES, MV KOVASH, MA NORUM, BE KELLY, JJ BACHER, AD EMERY, GT FOSTER, CC JONES, WP MILLER, DW BERMAN, BL MILLENER, DJ AF DIXIT, S BERTOZZI, W BUTI, TN FINN, JM HERSMAN, FW HYDEWRIGHT, CE HYNES, MV KOVASH, MA NORUM, BE KELLY, JJ BACHER, AD EMERY, GT FOSTER, CC JONES, WP MILLER, DW BERMAN, BL MILLENER, DJ TI STRUCTURE OF BE-9 FROM PROTON-SCATTERING AT 180 MEV SO PHYSICAL REVIEW C LA English DT Article ID NUCLEON-NUCLEUS SCATTERING; INELASTIC ELECTRON-SCATTERING; STATES AB Cross section and analyzing power measurements for the scattering of 180 MeV protons are used to investigate the structure of Be-9. Data were collected for 24 states below 21 MeV of excitation. Detailed line-shape analysis was used to isolate several broad states. Most notably, the dependence of apparent peak position upon momentum transfer was used to separate the strong resonance listed as 6.76 MeV in standard compilations into two contributions identified as the 7/2- member of the ground-state rotational band, located at 6.38 MeV, and the 9/2+ weak-coupling state, located at 6.76 MeV. Calculations of proton scattering were made using a density-dependent effective interaction in the local density approximation. The quadrupole contribution to elastic scattering was included in distorted wave Born approximation and found to have an important effect upon the analyzing power. For states dominated by a single multipolarity, neutron transition densities were fitted to (p,p') data and compared with the corresponding proton transition densities fitted to (e,e') data. We find that excitation of the rotational states and the 9/2+ state are essentially isoscalar. Shell model calculations were performed in the full 0h-omega and 1h-omega model spaces. Suggested assignments for most states are made by comparisons of shell model calculations with data for both (p,p') and (e,e'). Similar calculations for analog states observed with the Be-9(p,n)9B reaction at 135 MeV support the proposed assignments. Finally, several relatively narrow states are observed between 18 and 21 MeV that are candidates for positive-parity states with T = 3/2. C1 MIT,DEPT PHYS,CAMBRIDGE,MA 02139. MIT,NUCL SCI LAB,CAMBRIDGE,MA 02139. UNIV MARYLAND,DEPT PHYS & ASTRON,COLLEGE PK,MD 20742. INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47405. GEORGE WASHINGTON UNIV,DEPT PHYS,WASHINGTON,DC 20052. BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 36 TC 68 Z9 68 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 APR PY 1991 VL 43 IS 4 BP 1758 EP 1776 DI 10.1103/PhysRevC.43.1758 PG 19 WC Physics, Nuclear SC Physics GA FF991 UT WOS:A1991FF99100028 ER PT J AU PRICE, PB MOODY, KJ HULET, EK BONETTI, R MIGLIORINO, C AF PRICE, PB MOODY, KJ HULET, EK BONETTI, R MIGLIORINO, C TI HIGH-STATISTICS STUDY OF CLUSTER RADIOACTIVITY FROM U-233 SO PHYSICAL REVIEW C LA English DT Article ID HEAVY-FRAGMENT RADIOACTIVITY; EMISSION; DECAY AB Using a track-recording phosphate glass detector with a standard deviation sigma-z = 0.24 charge unit, we have collected approximately 10(3) tracks of energetic Ne clusters emitted from U-233 and have obtained a branching ratio B(Ne/alpha) = (7.2 +/- 0.5 +/- 0.7) X 10(-13). This is consistent with the previous value of (7.5 +/- 2.5) X 10(-13) which was based on 16 events. The larger of our two errors is that estimated to be due to uncertainty in absorption in our source. No candidate for Mg-28 emission survived our energy and angle cuts, from which we infer a branching ratio B(Mg/Ne) < 0.0018 (90% C.L.). The smallness of the Mg branch is inconsistent with predictions of the quantitatively most successful models of cluster emission heretofore used. The inconsistency is removed if the cluster emission models are modified by taking into account the Nilsson states of the parent and daughter nuclei for the two decay modes. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV NUCL CHEM,LIVERMORE,CA 94551. UNIV MILAN,IST FIS GEN APPLICATA,I-20122 MILAN,ITALY. NATL INST NUCL PHYS,SEZ MILANO,MILAN,ITALY. RP PRICE, PB (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 19 TC 14 Z9 14 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD APR PY 1991 VL 43 IS 4 BP 1781 EP 1788 DI 10.1103/PhysRevC.43.1781 PG 8 WC Physics, Nuclear SC Physics GA FF991 UT WOS:A1991FF99100030 ER PT J AU RAY, A SHAPIRA, D HALBERT, ML DELCAMPO, JG KIM, HJ SULLIVAN, JP SHIVAKUMAR, B MITCHELL, J AF RAY, A SHAPIRA, D HALBERT, ML DELCAMPO, JG KIM, HJ SULLIVAN, JP SHIVAKUMAR, B MITCHELL, J TI SPIN ALIGNMENT AND DENSITY-MATRIX MEASUREMENT IN 28SI+12C ORBITING REACTION SO PHYSICAL REVIEW C LA English DT Article ID BACK-ANGLE YIELDS; CROSS-SECTIONS; NUCLEAR COLLISIONS; ASYMMETRIC FISSION; REACTION-PRODUCTS; DEPENDENCE; FUSION; DISTRIBUTIONS; AL-27+O-16; MODEL AB Gamma-ray angular correlations have been measured for the damped reactions C-12(Si-28, C-12)Si-28 between theta-c.m. = 120-degrees and 160-degrees for E(c.m.) = 43.5 and 48 MeV. The spin alignments and density matrices have been deduced from the observed angular distribution of the gamma rays for Si-28 states in -10 < Q < 0 and -16 < Q < 0 MeV for E(c.m.) = 43.5 and 48 MeV, respectively, and for C-12(2(1)+) state in strongly damped region Q < -10 MeV. We find that the spin angular momenta of the nuclei are poorly aligned with respect to the normal to the reaction plane and the density matrices for the C-12(2(1)+) and Si-28 states are almost diagonal with respect to the direction of motion of the outgoing particle. We also find qualitatively similar behavior of the spin alignments for Si-28 states in strongly damped region. The measured density matrices and spin alignments are consistent with the picture of formation of a long-lived dinuclear complex undergoing orbiting, bending, and wriggling motions, but not with those obtained from statistical compound nucleus or sticking-model calculations. C1 TEXAS A&M UNIV SYST,INST CYCLOTRON,COLLEGE STN,TX 77843. YALE UNIV,WRIGHT NUCL STRUCT LAB,NEW HAVEN,CT 06511. RP RAY, A (reprint author), OAK RIDGE NATL LAB,JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831, USA. NR 29 TC 10 Z9 10 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD APR PY 1991 VL 43 IS 4 BP 1789 EP 1799 DI 10.1103/PhysRevC.43.1789 PG 11 WC Physics, Nuclear SC Physics GA FF991 UT WOS:A1991FF99100031 ER PT J AU JAROSZEWICZ, T BRODSKY, SJ AF JAROSZEWICZ, T BRODSKY, SJ TI Z-DIAGRAMS OF COMPOSITE OBJECTS SO PHYSICAL REVIEW C LA English DT Article ID IMPULSE APPROXIMATION; ELASTIC-SCATTERING; PHYSICS AB We examine the effect of particle compositeness on the importance of "Z diagrams", i.e., virtual particle-antiparticle states appearing in scattering processes. The examples of positronium in QED, and of the nucleon in the QCD-based quark model, are discussed in detail. Generally, if the composite particle consists of N constituents, its Z-diagram amplitude involves creation and annihilation of N constituent-anticonstituent pairs. This process (which we assume to be governed by Coulomb-type interactions with the "fine structure constant" alpha) must take place in a small volume approximately 1/M3, where M is the particle's mass; an additional suppression is due to the fact that the created system is electrically (or color) neutral. The composite particle's Z-diagram amplitude is then suppressed, compared to that for an elementary particle, by at least a factor f(z) approximately (q2/M2)[alpha-2/(M3R3)]N-1, where q is the momentum transfer to the particle, and R the composite particle's size. The decoupling of the composite Z diagrams at zero momentum transfer is consistent with low-energy theorems. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP JAROSZEWICZ, T (reprint author), UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024, USA. NR 21 TC 19 Z9 19 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 APR PY 1991 VL 43 IS 4 BP 1946 EP 1957 DI 10.1103/PhysRevC.43.1946 PG 12 WC Physics, Nuclear SC Physics GA FF991 UT WOS:A1991FF99100048 ER PT J AU BAUER, RW BAZAN, G BECKER, JA HOWE, RE MATHEWS, GJ AF BAUER, RW BAZAN, G BECKER, JA HOWE, RE MATHEWS, GJ TI NEUTRON-CAPTURE CROSS-SECTIONS OF SR-86 AND SR-87 FROM 100 EV TO 1 MEV, THE CONDITIONS FOR THE ASTROPHYSICAL S PROCESS, AND THE RB-87 SR-87 COSMOCHRONOMETER SO PHYSICAL REVIEW C LA English DT Article ID R-PROCESS; NUCLEOSYNTHESIS; ISOTOPES; AGE; GALAXY; RB-85 AB The neutron-capture cross sections for Sr-86, Sr-87 have been measured by the neutron-time-of-flight technique from 100 eV to 1 MeV. Maxwellian-averaged capture cross sections have been determined for stellar temperatures ranging from kT = 10 to 100 keV. At kT = 30 keV we obtain 70 +/- 4 and 97 +/- 5 mb for Sr-86 and Sr-87, respectively. These cross sections are combined with other existing data to deduce values for the stellar neutron density and temperature during s-process nucleosynthesis and to analyze the viability of the Rb-87-Sr-87 chronometric pair as a means to determine the age of the Galaxy. RP BAUER, RW (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Bazan, Guillermo/B-7625-2014 NR 29 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 APR PY 1991 VL 43 IS 4 BP 2004 EP 2011 DI 10.1103/PhysRevC.43.2004 PG 8 WC Physics, Nuclear SC Physics GA FF991 UT WOS:A1991FF99100053 ER PT J AU MORDECHAI, S WARD, H JOHNSON, K KAHRIMANIS, G SAUNDERS, D MOORE, CF ODONNELL, JM KAGARLIS, MA SMITH, D FORTUNE, HT MORRIS, CL AF MORDECHAI, S WARD, H JOHNSON, K KAHRIMANIS, G SAUNDERS, D MOORE, CF ODONNELL, JM KAGARLIS, MA SMITH, D FORTUNE, HT MORRIS, CL TI COMPARISON OF THE DOUBLE GIANT-DIPOLE STATES OBSERVED IN PI-, PI+) AND (PI+, PI-) REACTIONS ON CA-40 AND AL-27 SO PHYSICAL REVIEW C LA English DT Note ID CHARGE-EXCHANGE; RESONANCE AB The double isovector giant-dipole state has been observed in the (pi-, pi+) DELTA-T(z) = +2 and (pi+, pi-) DELTA-T(z) = -2 double-charge-exchange reactions on Ca-40 and Al-27. The resonances observed in the (pi-,pi+) reaction are closely related via Coulomb energy and isospin symmetry to the resonances measured in the inverse (pi+,pi-) reaction on the same nuclei. The new observations provide strong support for the identification of the double giant-dipole state in nuclei. The differences between the self-conjugate and non-self-conjugate cases are outlined. C1 UNIV TEXAS,AUSTIN,TX 78712. UNIV PENN,PHILADELPHIA,PA 19104. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP MORDECHAI, S (reprint author), BEN GURION UNIV NEGEV,IL-84105 BEER SHEVA,ISRAEL. NR 10 TC 14 Z9 14 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD APR PY 1991 VL 43 IS 4 BP R1509 EP R1512 PG 4 WC Physics, Nuclear SC Physics GA FF991 UT WOS:A1991FF99100003 ER PT J AU ANDERSON, JD AUSTERN, MH CAHN, RN AF ANDERSON, JD AUSTERN, MH CAHN, RN TI PRODUCTION OF J = 2 RESONANCES IN 2-PHOTON COLLISIONS SO PHYSICAL REVIEW D LA English DT Article ID ANTIQUARK BOUND-STATES; QUARK AB Two experiments have observed an enhancement in the pi-pi-pi channel in gamma-gamma collisions, which they identify as the pi-2(1670), a J(P) = 2- state. Preliminary results in the eta-pi-pi channel show a resonance about 200 MeV higher. A nonrelativistic-quark-model calculation predicts gamma-gamma widths for these d-wave states two to three orders of magnitude smaller than are observed, although the same model successfully describes the p-wave J(p) = 2+ states. Some angular correlations that might confirm the J(P) = 2- assignment are discussed. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP ANDERSON, JD (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 15 TC 10 Z9 10 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD APR 1 PY 1991 VL 43 IS 7 BP 2094 EP 2103 DI 10.1103/PhysRevD.43.2094 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FE754 UT WOS:A1991FE75400004 ER PT J AU BERNARD, CW ELKHADRA, AX SONI, A AF BERNARD, CW ELKHADRA, AX SONI, A TI SEMILEPTONIC DECAYS ON THE LATTICE - THE EXCLUSIVE O- TO O- CASE SO PHYSICAL REVIEW D LA English DT Article ID KOBAYASHI-MASKAWA MATRIX; BRANCHING FRACTIONS; WILSON FERMIONS; QUARK-MODEL; FORM-FACTOR; B-MESONS AB We present our results for the meson form factors of several semileptonic decays. They are computed from the corresponding matrix elements evaluated on the lattice as ratios of Green's functions. The renormalization of the local operators is calculated nonperturbatively. The dependence of the form factors on the four-momentum transfer q2 is studied by injecting external three-momenta to the initial- and final-state mesons. We study the pseudoscalar decays K --> pi-lv, D --> Klv, D --> pi-lv, D(s) --> eta-lv, and D(s) --> Klv on different lattices. We also analyze scaling, finite-size, and SU(3)-symmetry-breaking effects. The uncertainties in some lattice parameters, e.g., a-1, as a source of systematic errors in this calculation are discussed. C1 FERMI NATL ACCELERATOR LAB,THEORY GRP,BATAVIA,IL 60510. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. UNIV CALIF SANTA BARBARA,INST THEORET PHYS,SANTA BARBARA,CA 93106. NR 43 TC 55 Z9 55 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD APR 1 PY 1991 VL 43 IS 7 BP 2140 EP 2156 DI 10.1103/PhysRevD.43.2140 PG 17 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FE754 UT WOS:A1991FE75400009 ER PT J AU LI, ZP CLOSE, FE BARNES, T AF LI, ZP CLOSE, FE BARNES, T TI RELATIVISTIC EFFECTS IN GAMMA-GAMMA-DECAYS OF P-WAVE POSITRONIUM AND QQBAR SYSTEMS SO PHYSICAL REVIEW D LA English DT Article ID QUARK-MODEL; MESONS AB Theories of the two-photon couplings of P-wave positronium and qqBAR systems are reviewed and a relationship is found between field-theoretic calculations of qqBAR --> gamma-gamma and the vector-meson-dominance model for both heavy- and light-quark systems. Relativistic corrections to the two-photon decay rates are evaluated and are found to be very important for the light-quark system. We find that the widely quoted ratio of 15/4 between the gamma-gamma widths of heavy-quark scalar and tensor mesons is significantly modified in the light-qqBAR sector. We find however that the helicity-zero amplitude for the gamma-gamma coupling of tensor mesons, which vanishes in the nonrelativistic limit, remains small for light quarks, in accord with experimental observation. C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,CTR COMPUTAT INTENS PROBLEMS,OAK RIDGE,TN 37831. RUTHERFORD APPLETON LAB,DIV THEORY,DIDCOT OX11 0QX,OXON,ENGLAND. RP LI, ZP (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 16 TC 78 Z9 78 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 APR 1 PY 1991 VL 43 IS 7 BP 2161 EP 2170 DI 10.1103/PhysRevD.43.2161 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FE754 UT WOS:A1991FE75400011 ER PT J AU DUNIETZ, I QUINN, H SNYDER, A TOKI, W LIPKIN, HJ AF DUNIETZ, I QUINN, H SNYDER, A TOKI, W LIPKIN, HJ TI HOW TO EXTRACT CP-VIOLATING ASYMMETRIES FROM ANGULAR-CORRELATIONS SO PHYSICAL REVIEW D LA English DT Article ID SEQUENTIAL DECAYS; P-VIOLATION; V1V2 MODES; LBARALB; QBARAQB; TESTS AB Large CP-violation effects can occur for time-evolved B0 decays into definite CP eigenstates. The rates into these unique CP eigenmodes are tiny. This article advocates the use of many additional modes that are not CP eigenstates because of mixtures of angular momenta. Naively, for those modes a partial and sometimes large cancellation of the CP asymmetry occurs. However, a detailed study of their angular correlations enables the projection onto definite CP eigenstates, and thus recovers the full CP asymmetry. C1 WEIZMANN INST SCI,DEPT NUCL PHYS,IL-76100 REHOVOT,ISRAEL. RP DUNIETZ, I (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 28 TC 167 Z9 167 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 APR 1 PY 1991 VL 43 IS 7 BP 2193 EP 2208 DI 10.1103/PhysRevD.43.2193 PG 16 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FE754 UT WOS:A1991FE75400014 ER PT J AU VELTMAN, H AF VELTMAN, H TI THE PROCESS FFBAR-]WLWL SO PHYSICAL REVIEW D LA English DT Article ID W-PAIR PRODUCTION; RADIATIVE-CORRECTIONS; WEAK INTERACTIONS; E+E-->W+W; SCATTERING; BOSONS; MODEL; MASS AB We calculate the amplitude for the process ffBAR --> W(L)W(L) to one-loop order in the energy region m(top) congruent-to M(W) << E(W) << m(Higgs), keeping only the leading ln(m(Higgs)) terms. We also present the calculation for ffBAR --> phi-phi (phi = Higgs ghost); this provides a check of the results of the equivalence theorem, according to which the leading energy term for the W(L) amplitude is given by the corresponding phi amplitude. We emphasize the case f = t, m(t) congruent-to M(W). C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV PHYS,THEORET PHYS GRP,BERKELEY,CA 94720. NR 24 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 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD APR 1 PY 1991 VL 43 IS 7 BP 2236 EP 2258 DI 10.1103/PhysRevD.43.2236 PG 23 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FE754 UT WOS:A1991FE75400019 ER PT J AU GUPTA, R PATEL, A BAILLIE, CF KILCUP, GW SHARPE, SR AF GUPTA, R PATEL, A BAILLIE, CF KILCUP, GW SHARPE, SR TI EXPLORING GLUEBALL WAVE-FUNCTIONS ON THE LATTICE SO PHYSICAL REVIEW D LA English DT Article ID SCALAR-GLUEBALL; STRING TENSION; GAUGE-THEORY; MASSES; SU(3); TRANSITION; QCD AB We calculate the string tension and 0++ and 2++ glueball masses in pure gauge QCD using an improved lattice action. We compare various smearing methods, and find that the best glueball signal is obtained using smeared Wilson loops of a size of about 0.5 fm. Our results for mass ratios m0++/square-rootBAR-sigma = 3.5(3) and m2++/m0++ = 1.6(2) are consistent with those computed with the simple plaquette action. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. INDIAN INST SCI,CTR SUPERCOMP EDUC & RES,BANGALORE 560012,KARNATAKA,INDIA. UNIV BOULDER,DEPT PHYS,BOULDER,CO 80309. INDIAN INST SCI,CTR THEORET STUDIES,BANGALORE 560012,KARNATAKA,INDIA. CALTECH,DEPT PHYS,PASADENA,CA 91125. OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210. UNIV WASHINGTON,DEPT PHYS,SEATTLE,WA 98195. RP GUPTA, R (reprint author), UNIV CALIF SANTA BARBARA,INST THEORET PHYS,SANTA BARBARA,CA 93106, USA. RI Patel, Apoorva/F-4359-2010 NR 20 TC 32 Z9 32 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD APR 1 PY 1991 VL 43 IS 7 BP 2301 EP 2313 DI 10.1103/PhysRevD.43.2301 PG 13 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FE754 UT WOS:A1991FE75400024 ER PT J AU KAHANA, DE KAHANA, SH AF KAHANA, DE KAHANA, SH TI STANDARD-MODEL BOSONS AS COMPOSITE-PARTICLES SO PHYSICAL REVIEW D LA English DT Article ID JONA-LASINIO MODEL; NAMBU; ANOMALIES; SYMMETRY; FORCES AB The standard model of electroweak interactions, with the gauge and Higgs bosons appearing as composites, is derived from a Nambu-Jona-Lasinio-type four-fermion interaction, assumed to be valid above a high scale mu. Simple relationships are found for the composite-boson-to-top-quark-mass ratios and for the weak angle, sin2-theta-W = 3/8 as in grand unified theories. These relationships are evolved with the full renormalization group down to present experimental energies, yielding predictions for the top-quark and Higgs-boson masses, near 160 GeV for the former and near 140 GeV for the latter. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP KAHANA, DE (reprint author), CONTINUOUS ELECTRON BEAM ACCELERATOR FACIL,12000 JEFFERSON AVE,NEWPORT NEWS,VA 23606, USA. OI Kahana, David Ewan/0000-0003-1266-9089 NR 29 TC 8 Z9 8 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD APR 1 PY 1991 VL 43 IS 7 BP 2361 EP 2368 DI 10.1103/PhysRevD.43.2361 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FE754 UT WOS:A1991FE75400029 ER PT J AU BITAR, KM DEGRAND, T EDWARDS, R GOTTLIEB, S HELLER, UM KENNEDY, AD KOGUT, JB KRASNITZ, A LIU, W OGILVIE, MC RENKEN, RL ROSSI, P SINCLAIR, DK SUGAR, RL TEPER, M TOUSSAINT, D WANG, KC AF BITAR, KM DEGRAND, T EDWARDS, R GOTTLIEB, S HELLER, UM KENNEDY, AD KOGUT, JB KRASNITZ, A LIU, W OGILVIE, MC RENKEN, RL ROSSI, P SINCLAIR, DK SUGAR, RL TEPER, M TOUSSAINT, D WANG, KC TI HADRON THERMODYNAMICS WITH WILSON QUARKS SO PHYSICAL REVIEW D LA English DT Article ID FINITE-TEMPERATURE; CHIRAL SYMMETRY; FERMIONS; LATTICE; PLASMA; QCD AB We study hadron thermodynamics with Wilson quarks. The crossover curve between the high-and low-temperature phases is determined as a function of gauge coupling and hopping parameter on 8(3)x4 lattices. Screening lengths are calculated in the vicinity of the crossover region, and meson masses are calculated along the crossover curve on 8(2)x16x4 and 8(3)x16 lattices, respectively. C1 UNIV COLORADO,BOULDER,CO 80309. INDIANA UNIV,BLOOMINGTON,IN 47405. UNIV ILLINOIS,URBANA,IL 61801. THINKING MACHINES CORP,CAMBRIDGE,MA 02142. WASHINGTON UNIV,ST LOUIS,MO 63130. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106. UNIV OXFORD,OXFORD OX1 3NP,ENGLAND. UNIV ARIZONA,TUCSON,AZ 85721. RP BITAR, KM (reprint author), FLORIDA STATE UNIV,SUPERCOMP COMPUTAT RES INST,TALLAHASSEE,FL 32306, USA. OI Heller, Urs M./0000-0002-2780-5584 NR 14 TC 41 Z9 41 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD APR 1 PY 1991 VL 43 IS 7 BP 2396 EP 2400 DI 10.1103/PhysRevD.43.2396 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FE754 UT WOS:A1991FE75400033 ER PT J AU CHEN, WR HWA, RC WANG, XN AF CHEN, WR HWA, RC WANG, XN TI CLUSTER CASCADING IN THE GEOMETRICAL BRANCHING MODEL SO PHYSICAL REVIEW D LA English DT Note ID MULTIPLICITY DISTRIBUTIONS; HADRON-NUCLEUS; HIGH-ENERGY; COLLISIONS; JETS; INTERMITTENCY; FLUCTUATIONS AB The geometrical branching model is further developed in a direction that allows the branching part to be implemented by a Monte Carlo scheme of cascading cluster decays. A universal mass distribution is adopted for the determination of cluster masses. Good agreements with data on multiplicity distribution and average multiplicity are achieved. C1 UNIV OREGON,INST THEORET SCI,EUGENE,OR 97403. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. UNIV OREGON,DEPT PHYS,EUGENE,OR 97403. RP CHEN, WR (reprint author), OKLAHOMA SCH SCI & MATH,1515 N LINCOLN BLVD,OKLAHOMA CITY,OK 73104, USA. OI Wang, Xin-Nian/0000-0002-9734-9967 NR 27 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 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD APR 1 PY 1991 VL 43 IS 7 BP 2425 EP 2428 DI 10.1103/PhysRevD.43.2425 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FE754 UT WOS:A1991FE75400036 ER PT J AU ANJOS, JC APPEL, JA BEAN, A BRACKER, SB BROWDER, TE CREMALDI, LM DUBOSCQ, JE ELLIOTT, JR ESCOBAR, CO GIBNEY, M HARTNER, GF KARCHIN, PE KUMAR, BR LOSTY, MJ LUSTE, GJ MANTSCH, PM MARTIN, JF MCHUGH, S MENARY, SR MORRISON, RJ NASH, T PINFOLD, J PUNKAR, G PUROHIT, MV SANTORO, AFS SLIWA, K SOKOLOFF, MD SOUZA, MHG SPALDING, WJ STREETMAN, ME STUNDZIA, AB WITHERELL, MS AF ANJOS, JC APPEL, JA BEAN, A BRACKER, SB BROWDER, TE CREMALDI, LM DUBOSCQ, JE ELLIOTT, JR ESCOBAR, CO GIBNEY, M HARTNER, GF KARCHIN, PE KUMAR, BR LOSTY, MJ LUSTE, GJ MANTSCH, PM MARTIN, JF MCHUGH, S MENARY, SR MORRISON, RJ NASH, T PINFOLD, J PUNKAR, G PUROHIT, MV SANTORO, AFS SLIWA, K SOKOLOFF, MD SOUZA, MHG SPALDING, WJ STREETMAN, ME STUNDZIA, AB WITHERELL, MS TI STUDY OF THE DECAY DS+-]ETA'PI+ SO PHYSICAL REVIEW D LA English DT Note ID D+/ DECAYS; DS+/ DECAYS; STATES; ETA AB We report a limit of the branching ratio of D(s) +/- --> eta'-pi +/- from Fermilab charm photoproduction experiment E691. The eta' decay channels used are eta' --> eta-pi+pi-, eta --> pi+pi-pi-0; and eta' --> rho-gamma, rho --> pi+pi-. We find GAMMA-(D(s) +/- --> eta'-pi +/-)/GAMMA-(D(s) +/- --> phi-pi +/-) less-than-or-equal-to 1.3 at the 90% confidence level. C1 UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106. CARLETON UNIV,OTTAWA K1S 5B6,ONTARIO,CANADA. UNIV CINCINNATI,CINCINNATI,OH 45221. UNIV COLORADO,BOULDER,CO 80309. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV MISSISSIPPI,OXFORD,MS 38677. NATL RES COUNCIL CANADA,OTTAWA K1A 0R6,ONTARIO,CANADA. PRINCETON UNIV,PRINCETON,NJ 08544. UNIV SAO PAULO,SAO PAULO,BRAZIL. UNIV TORONTO,TORONTO M5S 1A7,ONTARIO,CANADA. YALE UNIV,NEW HAVEN,CT 06511. RP ANJOS, JC (reprint author), CTR BRASILEIRO PESQUISAS FIS,BR-20000 RIO DE JANEIRO,BRAZIL. RI Anjos, Joao/C-8335-2013 NR 14 TC 4 Z9 4 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD APR 1 PY 1991 VL 43 IS 7 BP R2063 EP R2066 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FE754 UT WOS:A1991FE75400001 ER PT J AU BERN, Z KOSOWER, DA AF BERN, Z KOSOWER, DA TI EFFICIENT CALCULATION OF ONE-LOOP QCD AMPLITUDES SO PHYSICAL REVIEW LETTERS LA English DT Article ID MULTI-GLUON SCATTERING; GAUGE-THEORIES; HADRON COLLIDERS; ORBIFOLDS; BREMSSTRAHLUNG; STRINGS; RENORMALIZATION AB We present the outline of a new and efficient technique for the calculation of loop amplitudes in a gauge theory. The technique is based on the technology of four-dimensional heterotic strings. We display here the application to the calculation of the one-loop corrections to gluon-gluon scattering, in ordinary dimensional regularization. We find complete agreement with the previous Feynman-diagram calculation of Ellis and Sexton. C1 FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP BERN, Z (reprint author), UNIV PITTSBURGH,DEPT PHYS,PITTSBURGH,PA 15260, USA. NR 38 TC 164 Z9 164 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 1 PY 1991 VL 66 IS 13 BP 1669 EP 1672 DI 10.1103/PhysRevLett.66.1669 PG 4 WC Physics, Multidisciplinary SC Physics GA FD899 UT WOS:A1991FD89900006 ER PT J AU MULLINS, SM WYSS, RA FALLON, P BYRSKI, T CURIEN, D FORBES, SA HE, YJ METCALFE, MS NOLAN, PJ PAUL, ES POYNTER, RJ REGAN, PH WADSWORTH, R AF MULLINS, SM WYSS, RA FALLON, P BYRSKI, T CURIEN, D FORBES, SA HE, YJ METCALFE, MS NOLAN, PJ PAUL, ES POYNTER, RJ REGAN, PH WADSWORTH, R TI SUPERDEFORMATION AND DOUBLE BLOCKING IN EU-142 SO PHYSICAL REVIEW LETTERS LA English DT Article ID STATES; SEARCH; LINE AB A superdeformed band of twenty transitions has been found in 142Eu following the reaction Pd-110(Cl-37, 5n) 142Eu at 160 MeV. This is the first case to be found intermediate to the A approximately 135 and A approximately 150 regions. The J(2) dynamic moment of inertia remains remarkably constant, suggesting that the configuration is pi-6(1)nu-6(3), blocking both proton and neutron band crossings. The band has been estimated to have approximately 3.6% of the channel intensity. This is remarkably intense, and is possibly due to a lowering of the odd-odd configuration by a strong residual n-p correlation. C1 OAK RIDGE NATL LAB,JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. UNIV YORK,DEPT PHYS,YORK YO1 5DD,N YORKSHIRE,ENGLAND. RP MULLINS, SM (reprint author), UNIV LIVERPOOL,OLIVER LODGE LAB,POB 147,LIVERPOOL L69 3BX,ENGLAND. RI CURIEN, Dominique/B-6718-2013 NR 22 TC 29 Z9 29 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 1 PY 1991 VL 66 IS 13 BP 1677 EP 1680 DI 10.1103/PhysRevLett.66.1677 PG 4 WC Physics, Multidisciplinary SC Physics GA FD899 UT WOS:A1991FD89900008 ER PT J AU LU, ZW WEI, SH ZUNGER, A AF LU, ZW WEI, SH ZUNGER, A TI LONG-RANGE ORDER IN BINARY LATE-TRANSITION-METAL ALLOYS SO PHYSICAL REVIEW LETTERS LA English DT Article AB A ground-state search of a generalized, many-body Ising Hamiltonian whose interaction energies are determined from first-principles local-density calculations reveals that PtX intermetallics for X = Ni, Cu, Rh, and Pd will form stable ordered structures at low temperatures. In contrast, d-band tight-binding models universally predict phase separation in all late-transition-metal alloys. It is shown that the previously neglected s-electron cohesion is responsible for this phase stability. RP LU, ZW (reprint author), SOLAR ENERGY RES INST,GOLDEN,CO 80401, USA. RI Zunger, Alex/A-6733-2013 NR 27 TC 83 Z9 83 U1 3 U2 11 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 1 PY 1991 VL 66 IS 13 BP 1753 EP 1756 DI 10.1103/PhysRevLett.66.1753 PG 4 WC Physics, Multidisciplinary SC Physics GA FD899 UT WOS:A1991FD89900027 ER PT J AU SUENAGA, M GHOSH, AK XU, YW WELCH, DO AF SUENAGA, M GHOSH, AK XU, YW WELCH, DO TI IRREVERSIBILITY TEMPERATURES OF NB3SN AND NB-TI SO PHYSICAL REVIEW LETTERS LA English DT Article ID TWO-DIMENSIONAL SUPERCONDUCTORS; MAGNETIC-FIELD; LATTICE; PARAMETERS; YBA2CU3O7 AB For fine multifilamentary Nb3Sn and Nb-Ti wires, it was found that there exists a surprisingly large temperature region (e.g., approximately 1 and 0.5 K at 2 T for a Nb3Sn and Nb-Ti wire, respectively) below the mean-field critical-magnetic-field line H(c2)(T) where the magnetization is reversible during a cycle of warming and cooling. The magnetic-field dependence of the lower boundary of this temperature region, i.e., the irreversibility temperature T(r)(H), was shown to follow theoretical predictions for flux-lattice melting based on an analysis of thermally induced flux-line fluctuations calculated with nonlocal lattice elasticity and the Lindemann melting criterion. RP SUENAGA, M (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV MAT SCI,UPTON,NY 11973, USA. NR 24 TC 110 Z9 111 U1 1 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 1 PY 1991 VL 66 IS 13 BP 1777 EP 1780 DI 10.1103/PhysRevLett.66.1777 PG 4 WC Physics, Multidisciplinary SC Physics GA FD899 UT WOS:A1991FD89900033 ER PT J AU JOHNSON, M FERRARI, MJ WELLSTOOD, FC CLARKE, J AF JOHNSON, M FERRARI, MJ WELLSTOOD, FC CLARKE, J TI MAGNETIC-FLUX NOISE IN HIGH-TC SUPERCONDUCTORS SO PHYSICAL REVIEW LETTERS LA English DT Letter ID DEPOSITED INSITU FILMS; COUPLING FORCE; SQUIDS; YB2CU3OY C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. RP JOHNSON, M (reprint author), BELLCORE,331 NEWMAN SPRINGS RD,RED BANK,NJ 07701, USA. NR 9 TC 0 Z9 0 U1 4 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 1 PY 1991 VL 66 IS 13 BP 1798 EP 1799 PG 2 WC Physics, Multidisciplinary SC Physics GA FD899 UT WOS:A1991FD89900040 ER PT J AU GANG, FY DIAMOND, PH CROTINGER, JA KONIGES, AE AF GANG, FY DIAMOND, PH CROTINGER, JA KONIGES, AE TI STATISTICAL DYNAMICS OF DISSIPATIVE DRIFT WAVE TURBULENCE SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID PLASMA; RELAXATION; VORTICES; MODEL; EDGE AB The statistical dynamics of a two-field model of dissipative drift wave turbulence is investigated using the EDQNM (eddy damped quasinormal Markovian) closure method [J. Fluid Mech. 41, 363 (1970)]. The analyses include studies of statistical closure equations, derivation of an H theorem, and its application to formulation of selective decay hypotheses for turbulent relaxation process. The results show that the dynamics of the two-field model is fundamentally different from that of the familiar, one-field Hasegawa-Mima model [Phys. Fluids 21, 87 (1978)]. In particular, density fluctuations nonlinearly couple to small scales, as does enstrophy. This transfer process is nonlinearly regulated by the dynamics of the density-vorticity cross correlation. Since density perturbations are not simply related to potential perturbations, as is vorticity, their transfer rate is greater. As a result, turbulent relaxation processes exhibit both dynamic alignment of density and vorticity and coherent vortex formation. C1 UNIV TEXAS,INST FUS STUDIES,AUSTIN,TX 78712. UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. GEN ATOM CO,SAN DIEGO,CA 92138. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 22 TC 46 Z9 46 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD APR PY 1991 VL 3 IS 4 BP 955 EP 968 DI 10.1063/1.859851 PG 14 WC Physics, Fluids & Plasmas SC Physics GA FD801 UT WOS:A1991FD80100013 ER PT J AU HAHM, TS TANG, WM AF HAHM, TS TANG, WM TI WEAK TURBULENCE THEORY OF COLLISIONLESS TRAPPED ELECTRON DRIVEN DRIFT INSTABILITY IN TOKAMAKS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID 2-DIMENSIONAL SPATIAL STRUCTURE; ENERGY CONFINEMENT; TRANSPORT; MODE; PLASMAS; WAVES; SIMULATIONS AB The toroidal collisionless trapped electron modes are analyzed in the weak turbulence regime treating both ions and trapped electrons nonlinearly in the presence of ion and electron temperature gradients. The spectral intensity of the density fluctuations in the nonlinearly saturated state is analytically obtained from the steady-state solution of the wave-kinetic equation. Distant nonlinear interactions between low-k-theta and high-k-theta modes of similar frequencies via trapped electron scattering (the resonance between the beat wave and the trapped electron precession drift frequencies) suppress the low-k-theta [k-theta-rho-s << (L(n)/R)1/2] modes while close interactions via ion Compton scattering (nonlinear ion Landau damping) produce a monotonically decreasing spectrum from k-theta-rho-s congruent-to (L(n)/R)1/2 to k-theta-rho-s congruent-to 1 according to an approximate power law k-theta-3. Various fluctuation amplitudes at saturation and the fluctuation-induced anomalous particle and heat fluxes are found to be smaller than the mixing length estimates. The plasma confinement is predicted to improve with higher T(i)/T(e), more peaked density profile, larger aspect ratio, and higher plasma current. Also, a significant dependence of transport on the electron temperature gradient is found which could contribute to the rigidity of the electron temperature profile often experimentally observed. RP HAHM, TS (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 50 TC 47 Z9 47 U1 1 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD APR PY 1991 VL 3 IS 4 BP 989 EP 999 DI 10.1063/1.859854 PG 11 WC Physics, Fluids & Plasmas SC Physics GA FD801 UT WOS:A1991FD80100016 ER PT J AU UCKAN, T HIDALGO, C BELL, JD HARRIS, JH DUNLAP, JL WILGEN, JB RITZ, CP RHODES, TL WOOTTON, AJ AF UCKAN, T HIDALGO, C BELL, JD HARRIS, JH DUNLAP, JL WILGEN, JB RITZ, CP RHODES, TL WOOTTON, AJ TI CHARACTERISTICS OF EDGE PLASMA TURBULENCE ON THE ATF TORSATRON SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID TOKAMAK EDGE; FLUCTUATIONS AB Measurements of electrostatic fluctuations on the edge of the Advanced Toroidal Facility (ATF) torsatron [Fusion Technol. 10, 179 (1986)] are used to study the role of the edge turbulence in the particle transport in this current-free magnetic configuration. Spatial profiles of the plasma electron density n(e), temperature T(e), and fluctuations in density (n approximately e) and in the plasma floating potential (PHI-approximately f) are measured at the edge in electron cyclotron heated plasmas using a Langmuir probe array. At the last closed flux surface (LCFS), r/a almost-equal-to 1, T(e) almost-equal-to 20-40 eV, and n(e) almost-equal-to 10(12) cm-3 for a line-averaged electron density nBAR(e) = (3-6) X 10(12) cm-3. The relative fluctuation levels decrease as the probe is moved into the core plasma. For T(e) > 20 eV, n approximately e/n(e) almost-equal-to 5%, and e-phi approximately f/T(e) almost-equal-to 2n approximately e/n(e) at r/a = 0.95. The measured fluctuation spectra are broadband (40-300 kHz) with kBAR-rho-s almost-equal-to (0.05-0.1), where kBAR is the average wave number of the fluctuations and rho-s is the ion Larmor radius at the sound speed. Near the LCFS, the density fluctuations can be approximated by n approximately e/n(e) almost-equal-to 0.4/kBAR(L)n, where L(n) is the gradient scale length of n(e). The propagation direction of the fluctuations reverses to the electron diamagnetic direction at r/a < 1. The phase velocity of the fluctuations and the electron drift velocity are comparable. The particle flux estimated from the fluctuations is consistent with fluxes obtained from the particle balance using the H-alpha spectroscopic measurements. Many of the features seen in the ATF edge fluctuations resemble those of Ohmically heated plasmas in the Texas Experimental Tokamak (TEXT). C1 ASOC EURATOM CIEMAT,MADRID,SPAIN. UNIV TEXAS,FUS RES CTR,AUSTIN,TX 78712. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. RP UCKAN, T (reprint author), OAK RIDGE NATL LAB,DIV FUS ENERGY,OAK RIDGE,TN 37831, USA. RI Hidalgo, Carlos/H-6109-2015 NR 22 TC 24 Z9 24 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD APR PY 1991 VL 3 IS 4 BP 1000 EP 1005 DI 10.1063/1.859882 PG 6 WC Physics, Fluids & Plasmas SC Physics GA FD801 UT WOS:A1991FD80100017 ER PT J AU WEBSTER, RB SCHWARZMEIER, JL LEWIS, HR CHOI, CK TERRY, WK AF WEBSTER, RB SCHWARZMEIER, JL LEWIS, HR CHOI, CK TERRY, WK TI 2-DIMENSIONAL KINETIC FIELD-REVERSED EQUILIBRIA SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID CONFIGURATIONS AB A two-dimensional kinetic description of field-reversed equilibria has been developed. Three equilibrium models are presented: a kinetic model, a rigidly rotating model, and a magnetohydrodynamics (MHD) model. The kinetic model of equilibrium provides spatial distributions of the macroscopic moments, including velocity shear, that are in good agreement with experimental observations. The rigidly rotating and MHD models allow more general pressure profiles than previous studies. These models, which allow the computation of a wide range of equilibria, suggest that for parameters typical of the current experiments kinetic modifications of the equilibrium are small; however, they may be important if the field-reversed configuration is interacting strongly with a magnetic mirror. Also, the ability to compute kinetic equilibria makes possible a self-consistent examination of the stability of field-reversed configurations, which is believed to be strongly influenced by kinetic effects. C1 PURDUE UNIV,SCH NUCL ENGN,W LAFAYETTE,IN 47907. RP WEBSTER, RB (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 10 TC 6 Z9 6 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD APR PY 1991 VL 3 IS 4 BP 1026 EP 1040 DI 10.1063/1.859831 PG 15 WC Physics, Fluids & Plasmas SC Physics GA FD801 UT WOS:A1991FD80100020 ER PT J AU ANDERSON, SL MCINTOSH, L AF ANDERSON, SL MCINTOSH, L TI PARTIAL CONSERVATION OF THE 5' NDHE-PSAC-NDHD 3' GENE ARRANGEMENT OF CHLOROPLASTS IN THE CYANOBACTERIUM SYNECHOCYSTIS SP PCC-6803 - IMPLICATIONS FOR NDH-D FUNCTION IN CYANOBACTERIA AND CHLOROPLASTS SO PLANT MOLECULAR BIOLOGY LA English DT Article DE CYANOBACTERIA; IRON-SULFUR PROTEIN; NDH; PHOTOSYSTEM-I; PSAC ID PHOTOSYNTHETIC ELECTRON-TRANSPORT; IRON-SULFUR PROTEIN; PHOTOSYSTEM-I; NADH DEHYDROGENASE; NUCLEOTIDE-SEQUENCE; CHLAMYDOMONAS-REINHARDII; ANABAENA-VARIABILIS; RESPIRATORY-CHAIN; DNA; SUBUNIT AB The psaC gene, which encodes the 8.9 kDa iron-sulfur containing subunit of Photosystem I, has been sequenced from Synechocystis sp. PCC 6803 and shows greater similarity to reported plant sequences than other cyanobacterial psaC sequences. The deduced amino acid sequence of the protein encoded by the Synechocystis psaC gene is identical to the tobacco PSA-C sequence. In plants psaC is located in the small single-copy region of the chloroplast genome between two genes (designated ndhE and ndhD) with similarity to genes encoding subunits of the mitochondrial NADH Dehydrogenase Complex I. The 5' ndhE-psaC-ndhD3' gene arrangement of higher plants is only partially conserved in Synechocystis. An open reading frame (ORF) upstream of the Synechocystis psaC gene has 85% identity to the tobacco ndhE gene. Downstream of psaC there is a 273 bp ORF with 48% identity to the 5' portion of the tobacco ndhD gene (1527 bp). psaC, ndhE and the region of similarity to ndhD are present in a single copy in the Synechocystis genome. Part of the wheat ndhD gene was sequenced and used as a probe for the presence of the 3' portion of the ndhD gene. The wheat ndhD probe did not hybridize to Synechocystis or Anabaena sp. PCC 7120 genomic DNA, but did hybridize to Oenothera chloroplast DNA. These results indicate the complete ndhD gene is absent in two cyanobacteria, and raises the question of what role, if any, the ndhD gene product plays in the facultative heterotroph Synechocystis sp. PCC 6803. C1 MICHIGAN STATE UNIV,US DOE,PLANT RES LAB,E LANSING,MI 48824. MICHIGAN STATE UNIV,DEPT BOT & PLANT PATHOL,E LANSING,MI 48824. MICHIGAN STATE UNIV,DEPT BIOCHEM,E LANSING,MI 48824. MICHIGAN STATE UNIV,GENET PROGRAM,E LANSING,MI 48824. NR 43 TC 27 Z9 31 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0167-4412 J9 PLANT MOL BIOL JI Plant Mol.Biol. PD APR PY 1991 VL 16 IS 4 BP 487 EP 499 DI 10.1007/BF00023416 PG 13 WC Biochemistry & Molecular Biology; Plant Sciences SC Biochemistry & Molecular Biology; Plant Sciences GA FK211 UT WOS:A1991FK21100001 PM 1907869 ER PT J AU GARVEY, RE ANDRIULLI, JB MCKEEVER, JW RUDNESS, RV AF GARVEY, RE ANDRIULLI, JB MCKEEVER, JW RUDNESS, RV TI MINIMUM-GAUGE, MAXIMUM-STIFFNESS GRAPHITE THERMOPLASTIC SPACECRAFT STRUCTURES SO POLYMER COMPOSITES LA English DT Article AB Advanced thermoplastic matrix composite materials have been studied for use in aricraft applications since about 1980. This Strategic Defense Initiative Organization/Air Force project was initaited in 1987 to study the suitability of this class of materials for use in spacecraft applications. This paper will report on the following work in progress: development of ultrahigh-modulus, pitch-fiber-reinforced thermoplastic composites; development of thin-ply graphite/thermoplastic materials for gage-limited spacecraft applications; and producibility demonstrations for generic spacecraft structures including open frames and T and L members, circular and square-tube truss configurations, and stiffened-skin modules. RP GARVEY, RE (reprint author), MARTIN MARIETTA ENERGY SYST INC,OAK RIDGE NATL LAB,DIV APPL TECHNOL,OAK RIDGE,TN 37831, USA. NR 26 TC 2 Z9 2 U1 0 U2 0 PU SOC PLASTICS ENG INC PI BROOKFIELD CENTER PA 14 FAIRFIELD DR, BROOKFIELD CENTER, CT 06804-0403 SN 0272-8397 J9 POLYM COMPOSITE JI Polym. Compos. PD APR PY 1991 VL 12 IS 2 BP 108 EP 118 DI 10.1002/pc.750120207 PG 11 WC Materials Science, Composites; Polymer Science SC Materials Science; Polymer Science GA FH089 UT WOS:A1991FH08900006 ER PT J AU AUGENLICHT, LH TAYLOR, J ANDERSON, L LIPKIN, M AF AUGENLICHT, LH TAYLOR, J ANDERSON, L LIPKIN, M TI PATTERNS OF GENE-EXPRESSION THAT CHARACTERIZE THE COLONIC MUCOSA IN PATIENTS AT GENETIC RISK FOR COLONIC-CANCER SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID COLORECTAL CARCINOMAS; ENTEROCYTIC DIFFERENTIATION; FAMILIAL POLYPOSIS; CELLS; CHROMOSOME-5; MUTATIONS; MITOCHONDRIA; INDIVIDUALS; GLUCOSE AB We have used a computer-driven scanning and image-processing system to identify a panel of 30 cDNA clones whose pattern of expression in individual biopsy specimens distinguishes the flat, normal-appearing colonic mucosa of patients in two genetic groups at high risk for development of colorectal cancer from that of normal colonic mucosa in low-risk individuals. The two high-risk groups, familial adenomatous polyposis and hereditary nonpolyposis colon cancer, are indistinguishable based on the pattern of expression of the 30 selected clones. This suggests that the extensive pleiotropic effects of the inherited loci, which may play an important role in the mechanism of increased risk and early onset of the disease, are similar in these populations. C1 ALBERT EINSTEIN CANC CTR,BRONX,NY 10467. LSB CORP,ROCKVILLE,MD 20850. MEM SLOAN KETTERING CANC CTR,NEW YORK,NY 10021. ARGONNE NATL LAB,ARGONNE,IL 60439. FU NCI NIH HHS [P30-CA1330, CA40558, CA41372] NR 31 TC 45 Z9 46 U1 0 U2 0 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD APR PY 1991 VL 88 IS 8 BP 3286 EP 3289 DI 10.1073/pnas.88.8.3286 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FG913 UT WOS:A1991FG91300067 PM 1849648 ER PT J AU LEUNG, FC BOHN, LR DAGLE, GE AF LEUNG, FC BOHN, LR DAGLE, GE TI ELEVATED EPIDERMAL GROWTH-FACTOR RECEPTOR-BINDING IN PLUTONIUM-INDUCED LUNG-TUMORS FROM DOGS SO PROCEEDINGS OF THE SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE LA English DT Article ID EXPRESSION; CELLS; CANCER AB The objective of this study is to examine and characterize epidermal growth factor receptor (EGF-R) binding in inhaled plutonium-induced canine lung-tumor tissue and to compare it with that in normal canine lung tissue. Crude membrane preparations from normal and lung-tumor tissue from beagle dogs were examined in a radioreceptor assay, using I-125-labeled epidermal growth factor (EGF) as a ligand. Specific EGF receptor binding was determined in the presence of excess unlabeled EGF. We have examined EGF receptor binding in eight lung-tumor samples obtained from six dogs. Epidermal growth factor receptor binding was significantly greater in lung-tumor samples (31.38%) compared with that in normal lung tissue (3.76%). Scatchard plot analysis from the displacement assay revealed that there was no statistical difference in the binding affinity but significantly higher concentration of EGF-R sites in the lung-tumor tissue (619 fmol/mg) than in normal lung tissue (53 fmol/mg). The increase in EGF-R number in plutonium-induced dog lung tumors does not seem to correlate with increase in the initial lung burden exposure to plutonium. Our results demonstrate that there is a significant increase in EGF-R binding in inhaled plutonium-induced dog lung tumors. RP LEUNG, FC (reprint author), PACIFIC NW LAB, DEPT BIOL & CHEM, K4-13,POB 999, RICHLAND, WA 99352 USA. NR 22 TC 5 Z9 5 U1 0 U2 2 PU BLACKWELL SCIENCE INC PI CAMBRIDGE PA 238 MAIN ST, CAMBRIDGE, MA 02142 SN 0037-9727 J9 P SOC EXP BIOL MED JI Proc. Soc. Exp. Biol. Med. PD APR PY 1991 VL 196 IS 4 BP 385 EP 389 PG 5 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA FE559 UT WOS:A1991FE55900004 PM 2008439 ER PT J AU BOREL, CC GERSTL, SAW POWERS, BJ AF BOREL, CC GERSTL, SAW POWERS, BJ TI THE RADIOSITY METHOD IN OPTICAL REMOTE-SENSING OF STRUCTURED 3-D SURFACES SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID CANOPY AB The radiosity method is a mathematical concept to describe the scattering of light between ideally diffuse (Lambertian) surfaces. The method presented takes reflections, transmission, and multiple scattering into account. Algorithms to find view factors and to solve the radiosity equations using the Gauss - Seidel iteration method are described. An example for a layered plant canopy model shows the relation between the radiosity method and radiative transfer. The application of the radiosity method to remote sensing problems of 3-D surfaces, e.g., calculation of a BRDF including internal shadowing effects is shown. Numerical results of radiosity calculations are compared with equivalent radiative transfer results. We conclude that the radiosity method is a valuable tool to model the transport of light in vegetative canopies as well as a tool to evaluate bidirectional reflectance characteristics of discrete leaf canopy structures, such as angular reflectance signatures. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV SPACE SCI & TECHNOL,MS A104,LOS ALAMOS,NM 87545. RI Borel, Christoph/P-2528-2014 NR 50 TC 81 Z9 89 U1 2 U2 12 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0034-4257 J9 REMOTE SENS ENVIRON JI Remote Sens. Environ. PD APR PY 1991 VL 36 IS 1 BP 13 EP 44 DI 10.1016/0034-4257(91)90028-5 PG 32 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA FU113 UT WOS:A1991FU11300002 ER PT J AU BROWN, MA BERRY, LG GOEL, RK AF BROWN, MA BERRY, LG GOEL, RK TI GUIDELINES FOR SUCCESSFULLY TRANSFERRING GOVERNMENT-SPONSORED INNOVATIONS SO RESEARCH POLICY LA English DT Article ID INDUSTRIAL C1 ILLINOIS STATE UNIV,NORMAL,IL 61761. RP BROWN, MA (reprint author), OAK RIDGE NATL LAB,DIV ENERGY,OAK RIDGE,TN 37831, USA. NR 16 TC 31 Z9 31 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0048-7333 J9 RES POLICY JI Res. Policy PD APR PY 1991 VL 20 IS 2 BP 121 EP 143 DI 10.1016/0048-7333(91)90075-2 PG 23 WC Management; Planning & Development SC Business & Economics; Public Administration GA FH312 UT WOS:A1991FH31200003 ER PT J AU DUGAN, PR MCILWAIN, ME AF DUGAN, PR MCILWAIN, ME TI SPECIAL ISSUE - BIOPROCESSING OF FOSSIL-FUELS - 4TH WORKSHOP ON BIOPROCESSING OF FOSSIL-FUELS, HELD IN TYSONS-CORNER, VA, USA, AUGUST 8-10, 1989 - INTRODUCTION SO RESOURCES CONSERVATION AND RECYCLING LA English DT Editorial Material RP DUGAN, PR (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-3449 J9 RESOUR CONSERV RECY JI Resour. Conserv. Recycl. PD APR PY 1991 VL 5 IS 2-3 BP 99 EP 100 DI 10.1016/0921-3449(91)90018-J PG 2 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA FK521 UT WOS:A1991FK52100001 ER PT J AU DUGAN, PR AF DUGAN, PR TI MICROBIAL CONVERSIONS OF SULFUR AND THEIR POTENTIAL FOR BIOPROCESSING OF FOSSIL-FUELS SO RESOURCES CONSERVATION AND RECYCLING LA English DT Article; Proceedings Paper CT 4TH WORKSHOP ON BIOPROCESSING OF FOSSIL FUELS CY AUG 08-09, 1989 CL TYSONS CORNER, VA SP US DOE, OFF FOSSIL ENERGY, IDAHO NATL ENGN LAB, CTR BIOPROC AB Fossil fuels are derived from once living organisms that always contained organo-sulfur. Metabolism of present day organisms is likely to be similar to that of organisms during fossil deposition, providing the basis for metabolic alteration of the sulfur found in fossil fuels. Metabolic conversions of organo-sulfur to non-organic sulfur as well as the conversions of non-organic to organic sulfur are described in the context of both the oxidation/reduction reactions of biochemical sulfur cycling and the physical movement of sulfur associated with geobiological and geochemical cycling. The various chemical forms of sulfur found in coals are considered in relation to what is known about the bioconversion of those sulfur forms. RP DUGAN, PR (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 0 TC 6 Z9 6 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-3449 J9 RESOUR CONSERV RECY JI Resour. Conserv. Recycl. PD APR PY 1991 VL 5 IS 2-3 BP 101 EP 125 DI 10.1016/0921-3449(91)90019-K PG 25 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA FK521 UT WOS:A1991FK52100002 ER PT J AU OLSON, GJ KELLY, RM AF OLSON, GJ KELLY, RM TI CHEMICAL AND MICROBIOLOGICAL PROBLEMS ASSOCIATED WITH RESEARCH ON THE BIODESULFURIZATION OF COAL - A REVIEW SO RESOURCES CONSERVATION AND RECYCLING LA English DT Article; Proceedings Paper CT 4TH WORKSHOP ON BIOPROCESSING OF FOSSIL FUELS CY AUG 08-09, 1989 CL TYSONS CORNER, VA SP US DOE, OFF FOSSIL ENERGY, IDAHO NATL ENGN LAB, CTR BIOPROC AB The study of microbial processes for the removal of organic and inorganic sulfur from coals is complicated by the lack of direct methods of measurement for organic sulfur content and the related incomplete understanding of the specific forms of organic sulfur in coal. In addition, the accessibility of specific chemical groups in the coal matrix to microorganisms and their enzymes is uncertain, raising questions about the nature and validity of model compound studies. Thus, interpretation of data from numerous efforts focussed on the microbial removal of inorganic and organic sulfur from coals remains controversial. The discussion here reviews recent developments in the chemical characterization of coal sulfur related to bioprocessing research and describes some recent efforts in involving sulfur transformation by hyperthermophilic archaebacteria. RP OLSON, GJ (reprint author), US DOE,PITTSBURGH ENERGY TECHNOL CTR,PITTSBURGH,PA 15236, USA. RI Unciano, Noel/B-6810-2009 NR 0 TC 5 Z9 5 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-3449 J9 RESOUR CONSERV RECY JI Resour. Conserv. Recycl. PD APR PY 1991 VL 5 IS 2-3 BP 183 EP 193 DI 10.1016/0921-3449(91)90024-I PG 11 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA FK521 UT WOS:A1991FK52100007 ER PT J AU PREMUZIC, ET LIN, MS AF PREMUZIC, ET LIN, MS TI INTERACTION BETWEEN THERMOPHILIC MICROORGANISMS AND CRUDE OILS - RECENT DEVELOPMENTS SO RESOURCES CONSERVATION AND RECYCLING LA English DT Article; Proceedings Paper CT 4TH WORKSHOP ON BIOPROCESSING OF FOSSIL FUELS CY AUG 08-09, 1989 CL TYSONS CORNER, VA SP US DOE, OFF FOSSIL ENERGY, IDAHO NATL ENGN LAB, CTR BIOPROC AB A considerable research effort in the area of microbially enhanced oil recovery (MEOR) has shown that it is promising and that a recovery biotechnology may be developed. Successful biochemical processes would have to be cost effective and have certain attributes, such as being able to produce emulsifying agents and acidify the media. Further, the microbes producing these conditions should be tolerant to high salt concentrations and be capable of metabolizing high molecular weight compounds. Since oil reservoirs are also subject to temperature and pressure variations, successful microbial strains should be able to adapt to such environments. Thermophilic microorganisms, which usually live in harsh environments, appear to be good candidates for MEOR. Continuing work in Brookhaven National Laboratory dealing with the chemistry and biochemistry of microorganisms living under extreme conditions has been expanded to a systematic study of the interaction of thermophilic microorganisms with crude oils and oil derivatives. Some recent results of these studies are presented. RP PREMUZIC, ET (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 0 TC 4 Z9 4 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-3449 J9 RESOUR CONSERV RECY JI Resour. Conserv. Recycl. PD APR PY 1991 VL 5 IS 2-3 BP 277 EP 284 DI 10.1016/0921-3449(91)90031-I PG 8 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA FK521 UT WOS:A1991FK52100014 ER PT J AU ANDREWS, G AF ANDREWS, G TI A MODEL FOR COAL DEPYRITIZATION SO RESOURCES CONSERVATION AND RECYCLING LA English DT Article; Proceedings Paper CT 4TH WORKSHOP ON BIOPROCESSING OF FOSSIL FUELS CY AUG 08-09, 1989 CL TYSONS CORNER, VA SP US DOE, OFF FOSSIL ENERGY, IDAHO NATL ENGN LAB, CTR BIOPROC AB A simplified geometric model for the coal/pyrite system is based on the assumption that pyritic inclusions are spherical with a log-normal size distribution. A computer program simulates grinding of a coal sample following rules that produce several types of particle including liberated inclusions (unbroken by grinding), cubes of coal containing inclusions either submerged or protruding from one or more faces, and cubes of coal with spherical segments missing. It then examines each particle and predicts as a function of particle size, the float/sink curve, the fraction of the pyrite liberated, the fraction that is exposed to bacterial attack and the exposed surface area of the pyrite. It is shown that a bacterial depyritization process should produce a given level of pyrite removal with a larger coal particle size and loss of heating value than a physical gravity separation. The coal "sample" size that can be examined is limited to that containing 1000 inclusions by computer time considerations. RP ANDREWS, G (reprint author), IDAHO NATL ENGN LAB,BIOTECHNOL UNIT,POB 1625,IDAHO FALLS,ID 83415, USA. NR 0 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-3449 J9 RESOUR CONSERV RECY JI Resour. Conserv. Recycl. PD APR PY 1991 VL 5 IS 2-3 BP 285 EP 295 DI 10.1016/0921-3449(91)90032-J PG 11 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA FK521 UT WOS:A1991FK52100015 ER PT J AU LADELFE, PC STAHL, DB AF LADELFE, PC STAHL, DB TI SPECTROPHOTOMETER DESIGN FOR THE CHARACTERIZATION OF COATED OPTICAL-COMPONENTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB The spectral transmittance and reflectance of an optical component, especially one with an interference coating, is severely dependent on angle of incidence and polarization. We report here on the design of an instrument which provides accurate, direct measurement of the spectral response of coated components at arbitrary angles of incidence. RP LADELFE, PC (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 4 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 APR PY 1991 VL 62 IS 4 BP 940 EP 943 DI 10.1063/1.1142033 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA FF017 UT WOS:A1991FF01700011 ER PT J AU RUCKMAN, MW QIU, SL STRONGIN, M AF RUCKMAN, MW QIU, SL STRONGIN, M TI AC DETECTION OF SECONDARY PHOTOELECTRONS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID ELECTRON AB A current channeltron whose anode is biased at positive high voltage is used in conjunction with a lock-in amplifier to measure secondary photoelectron emission. The detector has good sensitivity, noise rejection, and produces surface x-ray absorption fine structure (XAFS) spectra with low noise-to-signal ratios. The need to modulate the photoelectron emission current can be exploited to limit the detection of photoelectrons to the sample. RP RUCKMAN, MW (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD APR PY 1991 VL 62 IS 4 BP 1113 EP 1114 DI 10.1063/1.1142021 PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA FF017 UT WOS:A1991FF01700048 ER PT J AU BERNREUTHER, W SUZUKI, M AF BERNREUTHER, W SUZUKI, M TI THE ELECTRIC-DIPOLE MOMENT OF THE ELECTRON SO REVIEWS OF MODERN PHYSICS LA English DT Review ID HIGGS-BOSON-EXCHANGE; SPONTANEOUS CP VIOLATION; ANOMALOUS MAGNETIC-MOMENT; LOW-ENERGY SUPERGRAVITY; LEFT-RIGHT SYMMETRY; GAUGE-THEORIES; NON-CONSERVATION; WEAK-INTERACTION; LEPTON-NUMBER; Z0 DECAYS AB Recent experimental progress in the search for atomic electric dipole moments (EDMs) d(A) of cesium and thallium leads in particular to a substantially increased sensitivity to a possible electron EDM d(e) compared with existing upper bounds. Further considerable improvement in the measurement of d(Tl) is likely. After a brief synopsis of the theory of atomic EDMs, the authors discuss-in view of the expected experimental sensitivity to d(e) - the predictions for the electron EDM in various models of CP violation. C1 UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RP UNIV HEIDELBERG, INST THEORET PHYS, W-6900 HEIDELBERG, GERMANY. NR 201 TC 184 Z9 184 U1 2 U2 13 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0034-6861 EI 1539-0756 J9 REV MOD PHYS JI Rev. Mod. Phys. PD APR PY 1991 VL 63 IS 2 BP 313 EP 340 DI 10.1103/RevModPhys.63.313 PG 28 WC Physics, Multidisciplinary SC Physics GA FQ839 UT WOS:A1991FQ83900003 ER PT J AU STEPHENS, PW GOLDMAN, AI AF STEPHENS, PW GOLDMAN, AI TI THE STRUCTURE OF QUASI-CRYSTALS SO SCIENTIFIC AMERICAN LA English DT Article AB In 1984 scientists at the National Institute of Standards and Technology rapidly solidified an aluminum alloy. Instead of the expected amorphous, glassy material, the result was tiny grains that displayed a curious, fivefold symmetry. Now researchers are making progress in understanding the atomic structure of these unique forms of matter known as quasicrystals. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP STEPHENS, PW (reprint author), SUNY STONY BROOK,PHYS,STONY BROOK,NY 11794, USA. NR 6 TC 10 Z9 11 U1 1 U2 3 PU SCI AMERICAN INC PI NEW YORK PA 415 MADISON AVE, NEW YORK, NY 10017 SN 0036-8733 J9 SCI AM JI Sci.Am. PD APR PY 1991 VL 264 IS 4 BP 44 EP & PG 0 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FC451 UT WOS:A1991FC45100007 ER PT J AU NISHIMURA, C LIU, CT AF NISHIMURA, C LIU, CT TI ENVIRONMENTAL EMBRITTLEMENT IN L12-ORDERED (FE,CO)3V SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID HYDROGEN EMBRITTLEMENT; MECHANICAL-PROPERTIES; CO3TI POLYCRYSTALS; ORDERED ALLOYS; FRACTURE; NI3AL; (FE,CO,NI)3V C1 NATL RES INST MET,TOKYO 153,JAPAN. RP NISHIMURA, C (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 17 TC 19 Z9 20 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD APR PY 1991 VL 25 IS 4 BP 791 EP 794 DI 10.1016/0956-716X(91)90226-Q PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FE918 UT WOS:A1991FE91800007 ER PT J AU SRINIVASAN, S RUSS, JC SCATTERGOOD, RO AF SRINIVASAN, S RUSS, JC SCATTERGOOD, RO TI GRAIN-SIZE MEASUREMENTS USING THE POINT-SAMPLED INTERCEPT TECHNIQUE SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID POLYCRYSTALLINE CERAMICS; ARBITRARY PARTICLES; RELIABILITY C1 N CAROLINA STATE UNIV,DEPT MAT SCI & ENGN,RALEIGH,NC 27695. RP SRINIVASAN, S (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT SCI,MAIL STOP K765,LOS ALAMOS,NM 87545, USA. NR 18 TC 4 Z9 4 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD APR PY 1991 VL 25 IS 4 BP 931 EP 934 DI 10.1016/0956-716X(91)90251-U PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FE918 UT WOS:A1991FE91800032 ER PT J AU COHEN, DS WHITE, AB AF COHEN, DS WHITE, AB TI SHARP FRONTS DUE TO DIFFUSION AND VISCOELASTIC RELAXATION IN POLYMERS SO SIAM JOURNAL ON APPLIED MATHEMATICS LA English DT Article DE NON-FICKIAN DIFFUSION; POLYMERS; SINGULAR PERTURBATION ID CONTROLLED RELEASE PHARMACEUTICALS; FREE-BOUNDARY PROBLEMS; GLASSY-POLYMERS; SORPTION; TRANSPORT AB A model for sharp fronts in glassy polymers is derived and analyzed. The major effect of a diffusing penetrant on the polymer entanglement network is taken to be the inducement of a differential viscoelastic stress. This couples diffusive and mechanical processes through a viscoelastic response where the strain depends upon the amount of penetrant present. Analytically, the major effect is to produce explicit delay terms via a relaxation parameter. This accounts for the fundamental difference between a polymer in its rubbery state and the polymer in its glassy state, namely the finite relaxation time in the glassy state due to slow response to changing conditions. Both numerical and analytical perturbation studies of a boundary value problem for a dry glass polymer exposed to a penetrant solvent are completed. Concentration profiles in good agreement with observations are obtained. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP COHEN, DS (reprint author), CALTECH,PASADENA,CA 91125, USA. NR 28 TC 44 Z9 45 U1 1 U2 6 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER PH#382-9800, PHILADELPHIA, PA 19104-2688 SN 0036-1399 J9 SIAM J APPL MATH JI SIAM J. Appl. Math. PD APR PY 1991 VL 51 IS 2 BP 472 EP 483 DI 10.1137/0151023 PG 12 WC Mathematics, Applied SC Mathematics GA FC913 UT WOS:A1991FC91300008 ER PT J AU GEIST, GA AF GEIST, GA TI REDUCTION OF A GENERAL MATRIX TO TRIDIAGONAL FORM SO SIAM JOURNAL ON MATRIX ANALYSIS AND APPLICATIONS LA English DT Article DE TRIDIAGONALIZATION; NONSYMMETRIC; EIGENVALUES AB An algorithm for reducing a nonsymmetric matrix to tridiagonal form as a first step toward finding its eigenvalues is described. The algorithm uses a variation of threshold pivoting, where at each step, the pivot is chosen to minimize the maximum entry in the transformation matrix that reduces the next column and row of the matrix. Situations are given where the tridiagonalization process breaks down, and two recovery methods are presented for these situations. Although no existing tridiagonalization algorithm is guaranteed to succeed, this algorithm is found to be very robust and fast in practice. A gradual loss of similarity is also observed as the order of the matrix increases. RP GEIST, GA (reprint author), OAK RIDGE NATL LAB,MATH SCI SECT,POB 2009,OAK RIDGE,TN 37831, USA. NR 21 TC 20 Z9 21 U1 0 U2 1 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER PH#382-9800, PHILADELPHIA, PA 19104-2688 SN 0895-4798 J9 SIAM J MATRIX ANAL A JI SIAM J. Matrix Anal. Appl. PD APR PY 1991 VL 12 IS 2 BP 362 EP 373 DI 10.1137/0612026 PG 12 WC Mathematics, Applied SC Mathematics GA FD741 UT WOS:A1991FD74100012 ER PT J AU OSORIO, R FROYEN, S ZUNGER, A AF OSORIO, R FROYEN, S ZUNGER, A TI SUPERLATTICE ENERGETICS AND ALLOY THERMODYNAMICS OF GAAS/GE SO SOLID STATE COMMUNICATIONS LA English DT Article ID ORDER-DISORDER TRANSITION; LONG-RANGE ORDER; PSEUDOPOTENTIAL APPROACH; SEMICONDUCTOR ALLOYS; MIXING ENTHALPIES; PHASE-TRANSITION; SOLID-SOLUTIONS; GROWTH; CRYSTAL; (GAAS)1-XGE2X AB We re-examine the validity of the three-dimensional bulk thermodynamic description for the zinc-blende-to-diamond transition observed in (GaAs)1-xGe2x alloys. We use interaction parameters extracted from first-principles local-density total-energy calculations for (GaAs)p/(Ge2)p superlattices and a cluster-variation solution to the corresponding Ising-like hamiltonian. The resulting phase diagram obtained with such a realistic energy model fails to account for the observed critical composition in the relevant temperature range, suggesting that, contrary to a previous view, the transition is not driven by bulk thermodynamics. C1 UNIV BRASILIA,DEPT FIS,BR-70910 BRASILIA,DF,BRAZIL. RP OSORIO, R (reprint author), SOLAR ENERGY RES INST,GOLDEN,CO 80401, USA. RI Zunger, Alex/A-6733-2013 NR 38 TC 18 Z9 18 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD APR PY 1991 VL 78 IS 4 BP 249 EP 255 DI 10.1016/0038-1098(91)90191-W PG 7 WC Physics, Condensed Matter SC Physics GA FJ238 UT WOS:A1991FJ23800001 ER PT J AU KHAN, HR THOMPSON, JR OSSANDON, JG AF KHAN, HR THOMPSON, JR OSSANDON, JG TI MAGNETIZATION AND CRITICAL CURRENT-DENSITY RELATED TO MICROSTRUCTURE IN Y1BA2CU3O-APPROXIMATELY-7-AG COMPOSITES SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article ID FLUX-CREEP; SUPERCONDUCTIVITY; DEPENDENCE; YBA2CU3O7-DELTA; FILMS; PHASE; FIELD AB A magnetization study has been performed, for temperatures in the range from 4.5 to 60 K and magnetic induction fields up to 6.5 T, on a series of Y1Ba2Cu3O7-Ag composite materials prepared by powder sintering techniques. The temperature dependence of the intragrain critical current density J(c-intra) was determined and related to a flux creep model to obtain estimates for the flux pinning potential near 40 meV. Very similar values were obtained for pure YBCO material. These results indicate that the intragrain properties were not affected by the addition of Ag to these composites. C1 OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. UNIV TENNESSEE, DEPT PHYS, KNOXVILLE, TN 37996 USA. RP KHAN, HR (reprint author), FORSCHUNGSINT EDELMET & MET CHEM, W-7070 SCHWABISCH GMUND, GERMANY. NR 27 TC 10 Z9 10 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD APR PY 1991 VL 4 IS 4 BP 133 EP 136 DI 10.1088/0953-2048/4/4/001 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA FU593 UT WOS:A1991FU59300001 ER PT J AU KELLOGG, GL AF KELLOGG, GL TI TEMPERATURE-DEPENDENCE OF SURFACE SELF-DIFFUSION ON PT(001) SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 37TH INTERNATIONAL SYMP ON FIELD EMISSION CY JUL 29-AUG 03, 1990 CL ALBUQUERQUE, NM SP INT FIELD EMISS SOC ID ATOMIC EXCHANGE MECHANISM; METAL-SURFACES AB The surface diffusion of individual Pt atoms on the Pt(001) plane has been investigated by field ion microscopy. The map of binding sites visited by an atom as it diffuses across the surface in the temperature range from 170 to 205 K indicates that individual displacements occur exclusively in the [100] and [010] directions. Migration in these directions is consistent with diffusion by an atomic exchange mechanism. No evidence for diffusion by ordinary hopping was found in this temperature range. The activation energy of surface diffusion and diffusivity (Arrhenius prefactor) were found to be 0.47 +/- 0.01 eV and 1.3 x 10(-3) cm2/s, respectively. Diffusion off the plane edge was not observed at temperatures below 215 K. RP KELLOGG, GL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 14 TC 52 Z9 53 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD APR PY 1991 VL 246 IS 1-3 BP 31 EP 36 DI 10.1016/0039-6028(91)90388-9 PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FM118 UT WOS:A1991FM11800006 ER PT J AU RUSSELL, KF KENIK, EA MILLER, MK AF RUSSELL, KF KENIK, EA MILLER, MK TI CHARACTERIZATION OF THE TISHOMINGO METEORITE SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 37TH INTERNATIONAL SYMP ON FIELD EMISSION CY JUL 29-AUG 03, 1990 CL ALBUQUERQUE, NM SP INT FIELD EMISS SOC ID ATOM PROBE AB A preliminary microstructural characterization of the Tishomingo meteorite has been performed with the combined techniques of atom probe field ion microscopy, analytical electron microscopy, scanning electron microscopy, optical microscopy, and nanoindentation. Eighty percent of this meteorite appears to have undergone a martensitic transformation; the remaining 20% being taenite (gamma). Field ion microscopy and transmission electron microscopy of the martensitically transformed region revealed a mixture of a face centered cubic phase, a body centered cubic phase and some small face centered cubic precipitates. The composition of these precipitates was found to be between 51 and 57 at% Ni and the surrounding matrix approximately 20% Ni. RP RUSSELL, KF (reprint author), OAK RIDGE NATL LAB,DEPT MET & CERAM,OAK RIDGE,TN 37831, USA. NR 11 TC 2 Z9 2 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD APR PY 1991 VL 246 IS 1-3 BP 292 EP 298 DI 10.1016/0039-6028(91)90429-V PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FM118 UT WOS:A1991FM11800047 ER PT J AU MILLER, MK RUSSELL, KF AF MILLER, MK RUSSELL, KF TI INSITU PHASE-TRANSFORMATION IN THE FIELD-ION MICROSCOPE SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 37TH INTERNATIONAL SYMP ON FIELD EMISSION CY JUL 29-AUG 03, 1990 CL ALBUQUERQUE, NM SP INT FIELD EMISS SOC ID ELECTRIC-FIELD; ATOM PROBE; SPECIMEN; STRESS AB Many materials undergo an athermal martensitic transformation when cooled. This transformation has been observed in the Tishomingo meteorite during cooling to cryogenic temperatures. The meteorite is unstable when cooled to the cryogenic temperatures (40-85 K) suitable for field ion imaging since the martensite start (M(s)) temperature of this material (Fe-32.5wt%Ni) is approximately 235 K. In many cases, the in-situ martensitic transformation destroyed the field ion specimen prior to imaging. It was also found that the martensite to taenite transformation could be repeatedly induced at cryogenic temperatures by cycling the voltage and hence applying stress to the specimen. RP MILLER, MK (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 11 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD APR PY 1991 VL 246 IS 1-3 BP 299 EP 303 DI 10.1016/0039-6028(91)90430-Z PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FM118 UT WOS:A1991FM11800048 ER PT J AU HETHERINGTON, MG HYDE, JM MILLER, MK SMITH, GDW AF HETHERINGTON, MG HYDE, JM MILLER, MK SMITH, GDW TI MEASUREMENT OF THE AMPLITUDE OF A SPINODAL SO SURFACE SCIENCE LA English DT Article ID DECOMPOSITION AB One of the strengths of the atom-probe is its ability to measure the amplitude of composition fluctuations on a very fine scale. In previous papers, calculation of the amplitude of a spinodal using a sinusoidal composition distribution has been reported. In this paper, a comparison is made between the fit of experimental data from the atom-probe to a sinusoidal distribution and also to the amplitude of the composition variations expected from non-linear theories of the spinodal decomposition. It is shown that, in general, the Langer, Bar-on and Miller (LBM) non-linear theory provides better fits to the data. In particular, the non-linear theory is able to describe the asymmetry of the distribution functions for mean compositions far from the critical composition. C1 OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37831 USA. RP UNIV OXFORD, DEPT MAT, OXFORD, ENGLAND. NR 11 TC 30 Z9 30 U1 2 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 EI 1879-2758 J9 SURF SCI JI Surf. Sci. PD APR PY 1991 VL 246 IS 1-3 BP 304 EP 314 DI 10.1016/0039-6028(91)90431-Q PG 11 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FM118 UT WOS:A1991FM11800049 ER PT J AU JAYARAM, R HREN, JJ MILLER, MK AF JAYARAM, R HREN, JJ MILLER, MK TI APFIM TEM CHARACTERIZATION OF SOLUTE PARTITIONING IN A MODEL NI-MO-AL-TA SUPERALLOY SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 37TH INTERNATIONAL SYMP ON FIELD EMISSION CY JUL 29-AUG 03, 1990 CL ALBUQUERQUE, NM SP INT FIELD EMISS SOC ID ATOM PROBE; BASE SUPERALLOYS; CREEP AB A combined APFIM/TEM study of a model nickel-based Ni-Mo-Al-Ta superalloy has been performed to investigate the partitioning behaviour of Mo and Ta. Phase composition measurements on uncrept and failed creep-tested samples show that Mo partitions preferentially to the gamma phase and Ta to the gamma' phase. Composition profiles across gamma' interfaces showed no evidence for Mo or Ta segregation, apparently ruling this out as the mechanism responsible for the enhanced creep life of this alloy. DO22-ordered platelet precipitates were observed adjacent to the gamma' cuboidal precipitates. The presence of these DO22-ordered platelet precipitates would be an obstacle to dislocations and to the growth of the gamma' precipitates and hence might explain the good creep properties of alloys of this composition. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP JAYARAM, R (reprint author), N CAROLINA STATE UNIV,DEPT MAT SCI & ENGN,RALEIGH,NC 27695, USA. NR 16 TC 6 Z9 6 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD APR PY 1991 VL 246 IS 1-3 BP 323 EP 328 DI 10.1016/0039-6028(91)90434-T PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FM118 UT WOS:A1991FM11800052 ER PT J AU MILLER, MK AF MILLER, MK TI CONCEPTS IN ATOM PROBE DESIGNS SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 37TH INTERNATIONAL SYMP ON FIELD EMISSION CY JUL 29-AUG 03, 1990 CL ALBUQUERQUE, NM SP INT FIELD EMISS SOC AB Three new variants of the three-dimensional atom probe (3DAP), the parallel atom probe (PAP), the mapping atom probe (MAP), and the optical atom probe (OAP) are described. These three-dimensional atom probes permit the elemental reconstruction of a small volume of the specimen with near atomic resolution. The PAP detector consists of a pair of channel plates and a two dimensional array of either anodes or photodiodes with one timing channel per anode or photodiode. The MAP has a detector consisting of a Z-stack of channel plates and a square multianode array. In the MAP, both a timing stop signal and the accumulated electron charge is determined from each anode, thereby improving the spatial resolution over the PAP. The OAP is a serial version of three-dimensional atom probe that uses a digitized video signal of an imaging atom probe detector and a separate time signal from the phosphor screen to provide the x and y positions and mass-to-charge ratio of individual ions striking the detector. RP MILLER, MK (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 11 TC 26 Z9 26 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD APR PY 1991 VL 246 IS 1-3 BP 428 EP 433 DI 10.1016/0039-6028(91)90447-Z PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FM118 UT WOS:A1991FM11800065 ER PT J AU MILLER, MK AF MILLER, MK TI COMPUTERIZED FIELD EVAPORATION MICROSCOPY SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 37TH INTERNATIONAL SYMP ON FIELD EMISSION CY JUL 29-AUG 03, 1990 CL ALBUQUERQUE, NM SP INT FIELD EMISS SOC AB A new method has been developed to computerize field evaporation microscopy (FEM). Individual field evaporation images produced on the imaging atom probe detector are scanned by a MOS camera either in synchronization with the field evaporation pulse or at selected intervals during continuous field evaporation. The signal intensity of this photodiode array is read into a video buffer in an intelligent CAMAC module. The contents of this video buffer may then be transferred into main computer memory and stored on disk for further image processing. The individual images may be produced from either a separate output on the video buffer or from the data in computer memory. Animated serial sections and three-dimensional renderings may be produced from the data in computer memory. This method may also be used to reconstruct features from sequences of field ion images. RP MILLER, MK (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 8 TC 12 Z9 12 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD APR PY 1991 VL 246 IS 1-3 BP 434 EP 441 DI 10.1016/0039-6028(91)90448-2 PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FM118 UT WOS:A1991FM11800066 ER PT J AU MILLER, MK HETHERINGTON, MG AF MILLER, MK HETHERINGTON, MG TI LOCAL MAGNIFICATION EFFECTS IN THE ATOM PROBE SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 37TH INTERNATIONAL SYMP ON FIELD EMISSION CY JUL 29-AUG 03, 1990 CL ALBUQUERQUE, NM SP INT FIELD EMISS SOC AB Differences in the local magnification and curvature of phases in field evaporated field ion specimens have been shown to be an important consideration in atom probe analysis. A series of experiments has been performed on a high purity iron-45% chromium alloy that has been aged within a low temperature miscibility gap to produce a chromium-enriched alpha' phase and an iron-rich alpha phase. The effects of local magnification on field ion and field evaporation microscopy, and on three-dimensional and probe aperture atom probe analyses are discussed. It has been shown that the average composition of an atom probe experiment should be calculated from the number of atoms of each element divided by the total number of atoms but that the distance scale should be determined from distance-monitored type experiments. The reason for this is that the greater number of atoms per unit area in a darkly imaging region exactly compensates for the reduced probability of being sampled by the probe aperture. C1 UNIV OXFORD,DEPT MAT,OXFORD OX1 3PH,ENGLAND. RP MILLER, MK (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 9 TC 106 Z9 106 U1 0 U2 14 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD APR PY 1991 VL 246 IS 1-3 BP 442 EP 449 DI 10.1016/0039-6028(91)90449-3 PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FM118 UT WOS:A1991FM11800067 ER PT J AU CEREZO, A MILLER, MK AF CEREZO, A MILLER, MK TI EINZEL LENSES IN ATOM PROBE DESIGNS SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 37TH INTERNATIONAL SYMP ON FIELD EMISSION CY JUL 29-AUG 03, 1990 CL ALBUQUERQUE, NM SP INT FIELD EMISS SOC AB An electrostatic field and ion trajectory program has been used to characterise the focussing behaviour of simple einzel lenses used in linear flight-path atom probe designs. The focussing power and spot size obtained for two basic lens designs have been found as a function of applied voltage and lens size. A simple model for the beam convergence generated by such a lens has been used to calculate the time resolution and spatial focussing of a combined system including einzel lens and toroidal sector energy compensator. The results of these calculations agree well with the observed performance in a high resolution energy compensated atom probe. We find that the lens is able to improve the time resolution of a poorly focussed toroidal sector, but only on one side of the correct focussing condition. Under these conditions, accurate spatial focussing will not be achieved. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP CEREZO, A (reprint author), UNIV OXFORD,DEPT MAT,PARKS RD,OXFORD OX1 3PH,ENGLAND. NR 8 TC 5 Z9 5 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD APR PY 1991 VL 246 IS 1-3 BP 450 EP 456 DI 10.1016/0039-6028(91)90450-7 PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FM118 UT WOS:A1991FM11800068 ER PT J AU KELLOGG, GL PANITZ, JA SCHWOEBEL, PR AF KELLOGG, GL PANITZ, JA SCHWOEBEL, PR TI FIELD-EMISSION 90 - PROCEEDINGS OF THE 37TH INTERNATIONAL FIELD-EMISSION SYMPOSIUM - ALBUQUERQUE, NEW-MEXICO, USA 29 JULY 3 AUGUST 1990 - PREFACE SO SURFACE SCIENCE LA English DT Editorial Material C1 UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. RP KELLOGG, GL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD APR PY 1991 VL 246 IS 1-3 BP R7 EP R7 DI 10.1016/0039-6028(91)90379-7 PG 1 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FM118 UT WOS:A1991FM11800001 ER PT J AU COHEN, MR MERRILL, RP AF COHEN, MR MERRILL, RP TI HREELS, ARUPS AND XPS OF PYRIDINE ON NI(110) SO SURFACE SCIENCE LA English DT Article ID ENHANCED RAMAN-SCATTERING; ELECTRON-ENERGY LOSS; ULTRAHIGH-VACUUM; SURFACES; CHEMISORPTION; SPECTROSCOPY; BENZENE; NICKEL; CO; HYDRODENITROGENATION AB High-resolution electron energy loss spectroscopy, X-ray photoelectron spectroscopy and angular-resolved UV photoemission are applied to investigate the adsorption of pyridine on Ni(110). At low temperature, changes in the intensity of in-plane versus out-of-plane vibrational modes show a change in the surface orientation of the molecule as a function of coverage. The molecular plane is parallel to the surface at low coverages, indicating bonding through the pi molecular orbitals. At high coverages the molecular plane tilts toward normal with respect to the surface. This interpretation is consistent with ARUPS observations at normal emission. Heating results in desorption of weakly adsorbed pyridine at 180 K, with chemisorbed pyridine remaining in its low temperature orientation through room temperature. Decomposition occurs by 520 K, where the C-C and C-H stretching modes and the C-H deformation modes which are observed are uncharacteristic of molecular pyridine. C1 CORNELL UNIV,SCH CHEM ENGN,ITHACA,NY 14853. RP COHEN, MR (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV NUCL MAT TECHNOL,LOS ALAMOS,NM 87544, USA. NR 25 TC 34 Z9 34 U1 3 U2 17 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD APR PY 1991 VL 245 IS 1-2 BP 1 EP 11 DI 10.1016/0039-6028(91)90462-2 PG 11 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FG091 UT WOS:A1991FG09100004 ER PT J AU LOMBARDO, SJ BELL, AT AF LOMBARDO, SJ BELL, AT TI MONTE-CARLO SIMULATIONS OF THE EFFECT OF PRESSURE ON ISOTHERMAL AND TEMPERATURE-PROGRAMMED DESORPTION-KINETICS SO SURFACE SCIENCE LA English DT Article ID SINGLE-CRYSTAL SURFACES; RHODIUM POLYCRYSTALLINE SURFACES; CARBON-MONOXIDE; ADSORPTION; CO; PALLADIUM; NI(111); NI(100); CHEMISORPTION; SPECTRA AB A Monte Carlo simulation technique is presented for describing the adsorption, surface diffusion, and desorption kinetics of molecules from metal surfaces. Lateral interactions between adsorbed molecules are taken into account using the bond-order-conservation-Morse-potential method. The rate of desorption observed in the presence of a gas-phase species is higher than that observed in a vacuum. The increase in the apparent rate coefficient for desorption with increasing pressure can be ascribed to the effects of repulsive lateral interactions on the activation energy for desorption. The simulated kinetics are in good agreement with the experimentally-observed kinetics for the isothermal desorption of CO from polycrystalline Pd and for the temperature-programmed desorption of CO from Ni(100). C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DEPT CHEM ENGN,BERKELEY,CA 94720. RP LOMBARDO, SJ (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720, USA. OI Bell, Alexis/0000-0002-5738-4645 NR 37 TC 30 Z9 30 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD APR PY 1991 VL 245 IS 1-2 BP 213 EP 224 DI 10.1016/0039-6028(91)90480-G PG 12 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FG091 UT WOS:A1991FG09100022 ER PT J AU LOGAN, AD DATYE, AK HOUSTON, JE AF LOGAN, AD DATYE, AK HOUSTON, JE TI THE NATURE OF THE OXIDE PHASES FORMED DURING PROGRESSIVE OXIDATION OF THE RHODIUM(111) SURFACE SO SURFACE SCIENCE LA English DT Article ID THERMAL-DESORPTION; PARTICLES; LEED; CATALYSTS; REDUCTION; AL2O3 AB The progressive oxidation of the Rh(111) surface was studied by low-energy electron diffraction (LEED), Auger electron spectroscopy (AES), and temperature-programmed desorption (TPD). When the Rh(111) surface was oxidized in 1 Torr O2 for 10 min, the AES O/Rh ratio increased with increasing temperature and reached a maximum value at approximately 800 K. The oxide grown at this temperature had an average stoichiometry of RhO, and the LEED pattern consisted of a broadened hexagonal array of spots contracted 13% with respect to those from the Rh(111) surface. Oxidation at higher temperatures led to a decrease in the O/Rh ratio as the onset of oxide decomposition was reached. Consequently, the oxide grown at 973 K and 1 Torr had an average stoichiometry indicative of a surface suboxide with a composition near RhO0.5. This oxide yielded a well-ordered LEED pattern with approximately (8 x 8) superperiod. None of the LEED patterns observed in this study are consistent with the growth of Rh2O3(001) on the Rh surface. C1 UNIV NEW MEXICO,DEPT CHEM & NUCL ENGN,ALBUQUERQUE,NM 87131. SANDIA NATL LABS,SURFACE SCI LABS,ALBUQUERQUE,NM 87185. OI Datye, Abhaya/0000-0002-7126-8659 NR 22 TC 40 Z9 40 U1 5 U2 13 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD APR PY 1991 VL 245 IS 3 BP 280 EP 288 DI 10.1016/0039-6028(91)90030-V PG 9 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FH205 UT WOS:A1991FH20500009 ER PT J AU EVANS, JW MIESCH, MS AF EVANS, JW MIESCH, MS TI CATALYTIC REACTION-KINETICS NEAR A 1ST-ORDER POISONING TRANSITION SO SURFACE SCIENCE LA English DT Article ID SURFACE-REACTION MODEL; MEAN-FIELD THEORY; PHASE-TRANSITIONS; HETEROGENEOUS CATALYSIS; BEHAVIOR; LATTICE AB Various simple models of CO oxidation on surfaces, incorporating irreversible adsorption and reaction steps, exhibit first-order CO-poisoning and second-order O-poisoning kinetic phase transitions. Mean-field theories (MFT) can often accurately determine such quantities as the steady-state reaction rate near the first-order transition. However, we reveal the limitations of MFT predictions for the location of the spinodal point above this transition via a scaling analysis of the CO-poisoning kinetics. Furthermore, we note that MFT sometimes erroneously predicts evolution to a metastable or poisoned state rather than to the stable steady state. For example, just below the first-order transition, MFT predicts that a near CO-poisoned state will evolve to a completely CO-poisoned state, in contrast to the actual evolution towards the reactive steady-state. The latter behavior is elucidated here through an "oxidation epidemic" analysis wherein we consider the spreading of reaction from an initially empty patch embedded in a CO-poisoned sea. Spreading characteristics are quite distinct from analogous epidemic processes describing behavior near second-order (e.g., O-poisoning) transitions. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT MATH,AMES,IA 50011. RP EVANS, JW (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Miesch, Mark/B-1104-2008; OI Miesch, Mark/0000-0003-1976-0811 NR 19 TC 64 Z9 64 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD APR PY 1991 VL 245 IS 3 BP 401 EP 410 DI 10.1016/0039-6028(91)90042-Q PG 10 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FH205 UT WOS:A1991FH20500021 ER PT J AU DEWEY, SL LOGAN, J WOLF, AP BRODIE, JD ANGRIST, B FOWLER, JS VOLKOW, ND AF DEWEY, SL LOGAN, J WOLF, AP BRODIE, JD ANGRIST, B FOWLER, JS VOLKOW, ND TI AMPHETAMINE INDUCED DECREASES IN (F-18)-N-METHYLSPIROPERIDOL BINDING IN THE BABOON BRAIN USING POSITRON EMISSION TOMOGRAPHY (PET) SO SYNAPSE LA English DT Note DE MEDICAL IMAGING; LIGANDS; BABOON; AMPHETAMINE; DOPAMINE; PET ID INVIVO MICRODIALYSIS; TRANSFER CONSTANTS; DOPAMINE RELEASE C1 BROOKHAVEN NATL LAB, DEPT MED, UPTON, NY 11973 USA. VET ADM MED CTR, NEW YORK, NY 10010 USA. NYU MED CTR, DEPT PSYCHIAT, NEW YORK, NY 10016 USA. RP BROOKHAVEN NATL LAB, DEPT CHEM, UPTON, NY 11973 USA. FU NINDS NIH HHS [NS-15638] NR 27 TC 83 Z9 83 U1 2 U2 2 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0887-4476 EI 1098-2396 J9 SYNAPSE JI Synapse PD APR PY 1991 VL 7 IS 4 BP 324 EP 327 DI 10.1002/syn.890070409 PG 4 WC Neurosciences SC Neurosciences & Neurology GA FE943 UT WOS:A1991FE94300008 PM 2042113 ER PT J AU WU, YS PRUESS, K WITHERSPOON, PA AF WU, YS PRUESS, K WITHERSPOON, PA TI DISPLACEMENT OF A NEWTONIAN FLUID BY A NON-NEWTONIAN FLUID IN A POROUS-MEDIUM SO TRANSPORT IN POROUS MEDIA LA English DT Article DE NON-NEWTONIAN FLUIDS; BUCKLEY-LEVERETT; IMMISCIBLE DISPLACEMENT; POWER-LAW FLUIDS; RHEOLOGICAL MODELS; WELGE METHOD; FRACTIONAL FLOW THEORY; ENHANCED OIL RECOVERY AB This paper presents an analytical Buckley-Leverett-type solution for one-dimensional immiscible displacement of a Newtonian fluid by a non-Newtonian fluid in porous media. The non-Newtonian fluid viscosity is assumed to be a function of the flow potential gradient and the non-Newtonian phase saturation. To apply this method to field problems a practical procedure has been developed which is based on the analytical solution and is similar to the graphic technique of Welge. Our solution can be regarded as an extension of the Buckley-Leverett method to Non-Newtonian fluids. The analytical result reveals how the saturation profile and the displacement efficiency are controlled not only by the relative permeabilities, as in the Buckley-Leverett solution, but also by the inherent complexities of the non-Newtonian fluid. Two examples of the application of the solution are given. One application is the verification of a numerical model, which has been developed for simulation of flow of immiscible non-Newtonian and Newtonian fluids in porous media. Excellent agreement between the numerical and analytical results has been obtained using a power-law non-Newtonian fluid. Another application is to examine the effects of non-Newtonian behavior on immiscible displacement of a Newtonian fluid by a power-law non-Newtonian fluid. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720. RI Wu, Yu-Shu/A-5800-2011 NR 32 TC 28 Z9 29 U1 0 U2 8 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0169-3913 J9 TRANSPORT POROUS MED JI Transp. Porous Media PD APR PY 1991 VL 6 IS 2 BP 115 EP 142 PG 28 WC Engineering, Chemical SC Engineering GA FH341 UT WOS:A1991FH34100002 ER PT J AU ZIMMERMAN, RW BODVARSSON, GS AF ZIMMERMAN, RW BODVARSSON, GS TI A SIMPLE APPROXIMATE SOLUTION FOR HORIZONTAL INFILTRATION IN A BROOKS-COREY MEDIUM SO TRANSPORT IN POROUS MEDIA LA English DT Article DE INFILTRATION; SORPTIVITY; BROOKS-COREY AB A simple approximate solution is derived for the problem of one-dimensional absorption in a porous medium characterized by the Brooks-Corey equations. A piecewise-linear saturation profile, which satisfies flux continuity at the edge of the tension-saturated zone as well as an integrated form of the Richards' equation, is assumed. The predicted sorptivity agrees very well with the results of numerical simulations. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720. OI Zimmerman, Robert/0000-0001-6674-3403 NR 12 TC 28 Z9 28 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0169-3913 J9 TRANSPORT POROUS MED JI Transp. Porous Media PD APR PY 1991 VL 6 IS 2 BP 195 EP 205 PG 11 WC Engineering, Chemical SC Engineering GA FH341 UT WOS:A1991FH34100007 ER PT J AU JANSON, BN AF JANSON, BN TI DYNAMIC TRAFFIC ASSIGNMENT FOR URBAN ROAD NETWORKS SO TRANSPORTATION RESEARCH PART B-METHODOLOGICAL LA English DT Article ID FLOWS; MODEL; TIME AB This paper presents a nonlinear programming formulation of the dynamic user-equilibrium assignment problem (DUE) for urban road networks with multiple trip origins and destinations. DUE is a temporal generalization of the static user-equilibrium assignment problem (SUE) with additional constraints to insure temporally continuous paths of flow. In DUE, the full assignment period of several hours is discretized into shorter time intervals of 10-15 minutes each for which trip departure matrices are assumed to be known. This formulation of DUE includes SUE as a special case in which there is only one time interval for the full assignment period. The assumption of steady-state flows allows SUE to have all linear constraints, but DUE requires nonlinear flow continuity constraints. Whereas SUE is typically solved by methods of linear combinations, these methods create temporally discontinuous flows if applied to DUE. A dynamic traffic assignment heuristic (DTA) is presented that generates approximate solutions to DUE in an efficient manner for large networks. DTA is not a convergent solution algorithm for DUE, but was designed instead to produce assignments that approximate the DUE optimality conditions. An overview of alternative dynamic assignment approaches is given, including the limitations of other optimization and simulation approaches. Test results presented in this paper show that DTA generates both static and dynamic assignments that approximately satisfy the user-equilibrium conditions of these problems. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 30 TC 122 Z9 122 U1 3 U2 21 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0191-2615 J9 TRANSPORT RES B-METH JI Transp. Res. Pt. B-Methodol. PD APR-JUN PY 1991 VL 25 IS 2-3 BP 143 EP 161 DI 10.1016/0191-2615(91)90020-J PG 19 WC Economics; Engineering, Civil; Operations Research & Management Science; Transportation; Transportation Science & Technology SC Business & Economics; Engineering; Operations Research & Management Science; Transportation GA FG559 UT WOS:A1991FG55900006 ER PT J AU COOLING, BF AF COOLING, BF TI FORTRESS AMERICA - THE CORPS OF ENGINEERS, HAMPTON ROADS, AND UNITED-STATES COASTAL DEFENSE - CLARY,DA SO VIRGINIA MAGAZINE OF HISTORY AND BIOGRAPHY LA English DT Book Review RP COOLING, BF (reprint author), US DOE,WASHINGTON,DC, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU VIRGINIA HISTORICAL SOC PI RICHMOND PA BOX 7311, RICHMOND, VA 23221 SN 0042-6636 J9 VA MAG HIST BIOG JI VA. Mag. Hist. Biogr. PD APR PY 1991 VL 99 IS 2 BP 211 EP 212 PG 2 WC History SC History GA FR298 UT WOS:A1991FR29800009 ER PT J AU OSTEEN, AB BIBLER, JP AF OSTEEN, AB BIBLER, JP TI TREATMENT OF RADIOACTIVE LABORATORY WASTE FOR MERCURY REMOVAL SO WATER AIR AND SOIL POLLUTION LA English DT Article AB Routine analyses of Savannah River Laboratory wastes at the Savannah River Site occasionally reveal Hg concentrations in the waste in excess of the 0.200 mg L-1 RCRA limit. An ion exchange resin was demonstrated to be effective for the removal of dissolved Hg from experimental waste in a special, permitted decontamination project. The ion exchange material is Duolite(TM) GT-73, a polystyrene/divinylbenzene resin with thiol (S-H) functional groups. As a result of the resin's demonstrated effectiveness in that decontamination project, it has been placed in use or is under consideration for use with several other Site radwaste streams as a reliable medium for Hg removal. RP OSTEEN, AB (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER LAB,AIKEN,SC 29808, USA. NR 4 TC 15 Z9 17 U1 0 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD APR PY 1991 VL 56 BP 63 EP 74 DI 10.1007/BF00342261 PG 12 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA GM382 UT WOS:A1991GM38200006 ER PT J AU LINDBERG, SE TURNER, RR MEYERS, TP TAYLOR, GE SCHROEDER, WH AF LINDBERG, SE TURNER, RR MEYERS, TP TAYLOR, GE SCHROEDER, WH TI ATMOSPHERIC CONCENTRATIONS AND DEPOSITION OF HG TO A DECIDUOUS FOREST AT WALKER BRANCH WATERSHED, TENNESSEE, USA SO WATER AIR AND SOIL POLLUTION LA English DT Article ID ELEMENTAL MERCURY; ENVIRONMENT; VEGETATION; VAPOR; AIR AB Aerosol and total vapor-phase Hg concentrations in air have been measured at Walker Branch Watershed, Tennessee for approximately 2 yr. Airborne Hg at this site is dominated by vapor forms which exhibit a strong seasonal cycle, with summer maxima that correspond to elevated air temperature. Concentrations in this forest are near background levels; however, concentrations at a site within 3 km are significantly elevated due to emissions from Hg-contaminated soils. The concentration data have been combined with a recently modified dry deposition model to estimate dry deposition fluxes to the deciduous forest at Walker Branch. Weekly mean modeled V(d) values for Hg-degrees ranged from < 0.01 (winter) to > 0.1 (summer) cm s-1. Weekly dry deposition fluxes ranged from < 0.1-mu-g m-2 during winter to > 1.0-mu-g m-2 in the summer. Our dry deposition estimates plus limited measurements of wet deposition in this area indicate that dry deposition may be the dominant input process in this forest, at least during the summer. RP LINDBERG, SE (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Meyers, Tilden/C-6633-2016 NR 36 TC 78 Z9 80 U1 0 U2 8 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0049-6979 J9 WATER AIR SOIL POLL JI Water Air Soil Pollut. PD APR PY 1991 VL 56 BP 577 EP 594 DI 10.1007/BF00342301 PG 18 WC Environmental Sciences; Meteorology & Atmospheric Sciences; Water Resources SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences; Water Resources GA GM382 UT WOS:A1991GM38200046 ER PT J AU SISSON, JB VANGENUCHTEN, MT AF SISSON, JB VANGENUCHTEN, MT TI AN IMPROVED ANALYSIS OF GRAVITY DRAINAGE EXPERIMENTS FOR ESTIMATING THE UNSATURATED SOIL HYDRAULIC FUNCTIONS SO WATER RESOURCES RESEARCH LA English DT Article ID PARAMETER-ESTIMATION; CONDUCTIVITY; INSITU; MODELS AB The unsaturated hydraulic properties are important parameters in any quantitative description of water and solute transport in partially saturated soils. Currently, most in situ methods for estimating the unsaturated hydraulic conductivity (K) are based on analyses that require estimates of the soil water flux and the pressure head gradient. These analyses typically involve differencing of field-measured pressure head (h) and volumetric water content (theta) data, a process that can significantly amplify instrumental and measurement errors. More reliable methods result when differencing of field data can be avoided. One such method is based on estimates of the gravity drainage curve K'(theta) = dK/d-theta which may be computed from observations of theta and/or h during the drainage phase of infiltration drainage experiments assuming unit gradient hydraulic conditions. The purpose of this study was to compare estimates of the unsaturated soil hydraulic functions on the basis of different combinations of field data theta, h, K, and K'. Five different data sets were used for the analysis: (1) theta-h, (2) K-theta, (3) K'-theta; (4) K-theta-h, and (5) K'-theta-h. The analysis was applied to previously published data for the Norfolk, Troup, and Bethany soils. The K-theta-h and K'-theta-h data sets consistently produced nearly identical estimates of the hydraulic functions. The k-theta and K'-theta data also resulted in similar curves, although results in this case were less consistent than those produced by the K-theta-h and K'-theta-h data sets. We conclude from this study that differencing of field data can be avoided and hence that there is no need to calculate soil water fluxes and pressure head gradients from inherently noisy field-measured theta and h data. The gravity drainage analysis also provides results over a much broader range of hydraulic conductivity values than is possible with the more standard instantaneous profile analysis, especially when augmented with independently measured soil water retention data. C1 USDA,ARS,US SALIN LAB,RIVERSIDE,CA 92501. RP SISSON, JB (reprint author), IDAHO NATL ENGN LAB,MS 2107,POB 1625,IDAHO FALLS,ID 83415, USA. RI van Genuchten, Martinus/K-6892-2013 OI van Genuchten, Martinus/0000-0003-1654-8858 NR 25 TC 22 Z9 22 U1 0 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD APR PY 1991 VL 27 IS 4 BP 569 EP 575 DI 10.1029/91WR00184 PG 7 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA FF714 UT WOS:A1991FF71400012 ER PT J AU JOHNSON, JA CARLSON, NM SMARTT, HB CLARK, DE AF JOHNSON, JA CARLSON, NM SMARTT, HB CLARK, DE TI PROCESS-CONTROL OF GMAW - SENSING OF METAL TRANSFER MODE SO WELDING JOURNAL LA English DT Article DE GMAW PROCESS CONTROL; METAL TRANSFER MODE; TRANSFER MODE SENSING; SENSING EXPERIMENTS; HIGH-SPEED MOVIES; DROPLET FORMATION; CURRENT/VOLTAGE DATA; FEEDBACK CONTROL; STREAMING TRANSFER; GLOBULAR/SPRAY TRANSFER ID WELD AB One of the requirements of a sensing system for feedback control of gas metal arc welding (GMAW) is the capability to determine the metal-transfer mode. Because the operating boundary for the desired transfer mode, expressed as a function of mass input and heat input, may vary due to conditions beyond the control of the system, a means of detecting the transfer mode during welding is necessary. The metal-transfer mode has a large effect on weld pool behavior in GMAW, which, in turn, influences penetration, solidification, heat flow and the available range of welding positions and parameters. A series of sensing experiments was performed during which the audio emissions, welding current fluctuations and welding voltage fluctuations were recorded as a function of the transfer mode. Using laser backlighting and spectral filtering to suppress arc light, high-speed movies of the droplet formation and detachment were taken synchronously with the sensing data. The high-speed film was analyzed to investigate the physics of drop transfer. The film was synchronized with the digitized signal using an LED mounted in the camera pulsed at a set rate and recording the pulses on film and with the sensor data. A second LED was used to mark the film at the beginning of the data-acquisition period. Thus, transfer events recorded on the film can be analyzed and correlated with the digitized sensor data. Data acquired during globular transfer, spray transfer and stiff spray or streaming transfer were observed to correlate with droplet detachment and arc shorting. Instabilities in the transfer mode and mechanisms of drop detachment affecting drop velocity are discussed. Although the current and voltage data are also dependent on the characteristics of the welding power supply, the audio, current and voltage data could be used to discriminate among these different transfer modes. RP JOHNSON, JA (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83401, USA. NR 32 TC 11 Z9 13 U1 1 U2 5 PU AMER WELDING SOC PI MIAMI PA PO BOX 351040, MIAMI, FL 33135 SN 0043-2296 J9 WELD J JI Weld. J. PD APR PY 1991 VL 70 IS 4 BP S91 EP S99 PG 9 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA FD994 UT WOS:A1991FD99400011 ER PT J AU KAUTZ, DD OLSON, DL BURGARDT, P EDWARDS, GR AF KAUTZ, DD OLSON, DL BURGARDT, P EDWARDS, GR TI A CHARACTERIZATION OF PULSED ELECTRON-BEAM WELDING PARAMETERS SO WELDING JOURNAL LA English DT Article DE ELECTRON BEAM WELDING; PULSED WELDING; PULSED EBW PARAMETERS; LOW HEAT INPUT; ROOT IRREGULARITIES; SPIKING PHENOMENA; ELECTRON BEAM PULSES; FARADAY CUP CIRCUIT; WELD PENETRATION; WELD KEYHOLE WIDTH AB Interest existed in developing pulsed electron beam welding for applications in which keyhole penetration and low heat input were needed. The process parameters were checked with respect to weld penetration, conduction melting and root irregularities (e.g., incomplete penetration and porosity). The results indicated that only small gains could be achieved in penetration with respect to heat input, whereas the increase in root irregularities increased greatly. It was therefore concluded that pulsed electron beam welding in a keyhole mode is not satisfactory for most welding applications. C1 COLORADO SCH MINES,GOLDEN,CO 80401. RP KAUTZ, DD (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 12 TC 3 Z9 3 U1 3 U2 3 PU AMER WELDING SOC PI MIAMI PA PO BOX 351040, MIAMI, FL 33135 SN 0043-2296 J9 WELD J JI Weld. J. PD APR PY 1991 VL 70 IS 4 BP S100 EP S105 PG 6 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA FD994 UT WOS:A1991FD99400012 ER PT J AU LYKKEN, JD SONNENSCHEIN, J WEISS, N AF LYKKEN, JD SONNENSCHEIN, J WEISS, N TI FIELD-THEORETICAL ANALYSIS OF ANYONIC SUPERCONDUCTIVITY SO INTERNATIONAL JOURNAL OF MODERN PHYSICS A LA English DT Article AB We derive several results pertaining to anyonic superconductivity as described by a Chern-Simons field theory. (1) The renormalized Chern-Simons term at finite density is shown to vanish when the renormalized coefficient at zero density takes values Ne2/2-pi. This is the field-theoretical requirement to have a massless pole in the current-current correlator. We can then show that in the Chern-Simons description a system of charged anyons at zero temperature is a superconductor. This result is shown to hold to all orders in perturbation theory by generalizing a nonrenormalization theorem of the zero density case. (2) At finite temperature the renormalized Chern-Simons term does not vanish at the one-loop perturbative level. We compute the mass of this apparent "pseudo-Goldstone mode". We also exhibit an effect suggestive of critical behavior, for this same system, at a nonzero T(c). We discuss the possible implications of these perturbative results. (3) A low energy effective action for an anyonic superconductor is derived directly from Chern-Simons field theory. Several P and T violating effects occur. RP LYKKEN, JD (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 0 TC 33 Z9 33 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-751X J9 INT J MOD PHYS A JI Int. J. Mod. Phys. A PD MAR 30 PY 1991 VL 6 IS 8 BP 1335 EP 1368 DI 10.1142/S0217751X9100071X PG 34 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA EZ883 UT WOS:A1991EZ88300007 ER PT J AU LIN, BC MA, ZD GUIOCHON, G AF LIN, BC MA, ZD GUIOCHON, G TI INFLUENCE OF THE CHOICE OF THE BOUNDARY-CONDITIONS ON THE RESULTS OF THE DYNAMIC CHROMATOGRAPHY MODEL SO JOURNAL OF CHROMATOGRAPHY LA English DT Article ID NONLINEAR LIQUID-CHROMATOGRAPHY; THEORETICAL BAND PROFILES; MOBILE PHASE; PEAK PROFILES; DISPERSION; IDEAL AB An investigation of the influence of the choice of the boundary conditions on the shape of the band profile obtained by simulation of the elution process using the classical model of semi-ideal chromatography is presented. As the boundary condition represents the perturbation created at the column inlet, it influences the response of the column. It is shown that the peak area is conservative only if certain conditions are satisfied. Among other approximations, the Houghton equation does not fulfil these requirements. Contour plots are used to illustrate the band migration process and the properties of these bands in non-linear chromatography. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 22 TC 3 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD MAR 29 PY 1991 VL 542 IS 1 BP 1 EP 18 DI 10.1016/S0021-9673(01)88744-6 PG 18 WC Chemistry, Analytical SC Chemistry GA FH840 UT WOS:A1991FH84000001 ER PT J AU LANGRY, KC AF LANGRY, KC TI FORMATION OF IMIDAZOPYRIDINES BY THE PHASE-TRANSFER CATALYZED REACTION OF ALPHA-(AMINOMETHYL)PYRIDINES WITH CHCL3 AND ALKALINE HYDROXIDE SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Article ID FIBER-OPTIC SENSORS; FUJIWARA REACTION; SELECTIVITY; MECHANISM; NITROGEN; PYRIDINE; RATES AB The reaction of chloroform with 2-(aminomethyl)pyridine (1) under basic phase-transfer catalysis affords the highly fluorescent imidazo[1,5-alpha]pyridine (2) in 25% isolated yield. Despite the formation of considerable tarry residue, GC-MS indicates that the volatile fraction of the reaction is simple and consists of 2 and two minor residue, GC-MS indicates that the volatile fraction of the reaction is simple and consists of 2 and two minor components identified as N-(2-pyridylmethyl)formamide (6) and (2-pyridylmethyl)isonitrile (7). The basic phase transfer catalyzed reaction of chloroform with a series of alpha-(aminomethyl)azanaphthalenes was found to be general and yield the corresponding annulated imidazo derivaties in comparable yields. Despite product yields in the 25% range, GC of the reaction mixtures indicates that the volatile fractions generally consist of residual starting aminomethyl compound, the imidazo product, and a minor amount of the (alpha-azanaphthylmethyl)formamide. However, 3-(aminomethyl)isoquinoline (18) failed to provide any of the expected imidazo[1,5-b]isoquinoline (19). The failure to detect 19 was investigated. RP LAWRENCE LIVERMORE NATL LAB, DIV ENVIRONM SCI, POB 808, LIVERMORE, CA 94550 USA. NR 33 TC 14 Z9 14 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3263 J9 J ORG CHEM JI J. Org. Chem. PD MAR 29 PY 1991 VL 56 IS 7 BP 2400 EP 2404 DI 10.1021/jo00007a028 PG 5 WC Chemistry, Organic SC Chemistry GA FE817 UT WOS:A1991FE81700028 ER PT J AU HAWLEY, M RAISTRICK, ID BEERY, JG HOULTON, RJ AF HAWLEY, M RAISTRICK, ID BEERY, JG HOULTON, RJ TI GROWTH-MECHANISM OF SPUTTERED FILMS OF YBA2CU3O7 STUDIED BY SCANNING TUNNELING MICROSCOPY SO SCIENCE LA English DT Article ID THIN-FILMS AB The surface microstructures of c-axis-oriented films of YBa2Cu3O7, deposited by off-axis magnetron sputtering on MgO and SrTiO3 single crystal (100) substrates, have been investigated with scanning tunneling microscopy and atomic force microscopy. There is strong evidence that the films nucleate as islands and grow by adding material to the edge of a spirally rising step. This results in columnar grains, each of which contains a screw dislocation at its center. This microstructure may be of significance in determining superconducting properties such as critical current, and represents a significant difference between thin films (especially those grown in situ) and bulk materials. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. NR 17 TC 369 Z9 369 U1 3 U2 31 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAR 29 PY 1991 VL 251 IS 5001 BP 1587 EP 1589 DI 10.1126/science.251.5001.1587 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FD890 UT WOS:A1991FD89000029 PM 17793141 ER PT J AU TUOMISAARI, M HOWELL, RH MCMULLEN, T AF TUOMISAARI, M HOWELL, RH MCMULLEN, T TI POSITRONIUM FORMATION AND DIFFUSION IN THE RARE-GAS SOLIDS SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID BAND-GAP; EMISSION; ANNIHILATION; SPECTROSCOPY; CRYSTALS; QUARTZ AB The energy distributions of positronium emitted by the solid rare gases Ar, Kr and Xe following positron implantation have been measured. The positrons were implanted with a monoenergetic pulsed positron beam of incident energies ranging from 0.1 to 2 keV. The energy distributions of the positronium emitted from Ar and Kr are asymmetric, with high-energy tails. At high incident positron energies the high-energy tail is reduced and we use a model of hot positronium losing energy as it diffuses to the surface. The emitted distributions are largely well described by the Ore formation model, although the form of the energy distribution from Xe is not as easily interpreted. From Xe, a distribution having roughly the shape predicted by the Ore model is accompanied by a considerable amount of emission at energies below the positronium work function. Increased positronium energy loss with increasing incident positron energy is observed for all the samples, and comparison of the observed positronium emission energy spectra with an energy-dependent diffusion model yields an estimate of the deformation potential parameter for the interaction of positronium atoms with the phonons of the solid rare gases. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. VIRGINIA COMMONWEALTH UNIV,DEPT PHYS,RICHMOND,VA 23284. NR 26 TC 2 Z9 2 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD MAR 28 PY 1991 VL 24 IS 6 BP 1455 EP 1466 DI 10.1088/0953-4075/24/6/029 PG 12 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FF416 UT WOS:A1991FF41600029 ER PT J AU BARDAKCI, K CRESCIMANNO, M HOTES, SA AF BARDAKCI, K CRESCIMANNO, M HOTES, SA TI CLASSICAL W-ALGEBRAS AND NON-ABELIAN PARAFERMIONS SO PHYSICS LETTERS B LA English DT Article ID QUANTUM-FIELD THEORY AB We show that the known classical W algebras can be derived from the algebra satisfied by the non-abelian parafermion fields of the gauged WZW model. The extension of this construction to multi-local fields leads to new W-algebras. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV PHYS,THEORET PHYS GRP,BERKELEY,CA 94720. RP BARDAKCI, K (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 13 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 28 PY 1991 VL 257 IS 3-4 BP 313 EP 316 DI 10.1016/0370-2693(91)91898-6 PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FG039 UT WOS:A1991FG03900012 ER PT J AU DYKSTRA, H AF DYKSTRA, H TI SUPERSYMMETRIC MODEL FOR NEUTRINO MAGNETIC TRANSITION-MOMENT SO PHYSICS LETTERS B LA English DT Article AB A supersymmetric model for a large neutrino magnetic moment is presented. The neutrino mass is protected by an approximate horizontal symmetry. The model possesses an unbroken l(e)-l-mu symmetry which enforces the equality of the electron and muon neutrino masses. We find that for a 10 eV neutrino, the neutrino can have a magnetic transition moment up to 10(-12) mu-B without tuning of parameters. With tuning, the mass can be further suppressed or the magnetic moment correspondingly increased. RP DYKSTRA, H (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 13 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 28 PY 1991 VL 257 IS 3-4 BP 341 EP 345 DI 10.1016/0370-2693(91)91903-9 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FG039 UT WOS:A1991FG03900017 ER PT J AU DECAMP, D DESCHIZEAUX, B GOY, C LEES, JP MINARD, MN ALEMANY, R CRESPO, JM DELFINO, M FERNANDEZ, E GAITAN, V GARRIDO, LL MATO, P MIQUEL, R MIR, LM ORTEU, S PACHECO, A PERLAS, JA TUBAU, E CATANESI, MG CREANZA, D DE PALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G GAO, Y HU, H HUANG, D LIN, J LOU, J QIAO, C RUAN, T WANG, T XIE, Y XU, D XU, R ZHANG, J ZHAO, W ALBRECHT, H ATWOOD, WB BIRD, F BLUCHER, E BONVICINI, G BOSSI, F BROWN, D BURNETT, TH DREVERMANN, H DYDAK, F FORTY, RW GRAB, C HAGELBERG, R HAYWOOD, S JOST, B KASEMANN, M KELLNER, G KNOBLOCH, J LACOURT, A LEHRAUS, I LOHSE, T LUKE, D MARCHIORO, M MARTINEZ, M MAY, J MENARY, S MINTEN, A MIOTTO, A NASH, J PALAZZI, P RANJARD, F REDLINGER, G ROTH, A ROTHBERG, J ROTSCHEIDT, H VON RUDEN, W ST DENIS, R SCHLATTER, D TAKASHIMA, M TALBY, M TEJESSY, W WACHSMUTH, H WASSERBAECH, S WHEELER, S WIEDENMANN, W WITZELING, W WOTSCHACK, J AJALTOUNI, Z BARDADIN-OTWINOWSKA, M FALVARD, A EL FELLOUS, R GAY, P HARVEY, J HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PRORIOL, J PRULHIERE, F STIMPFL, G HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NIELSEN, ER NILSSON, BS EFTHYMIOPOULOS, I SIMOPOULOU, E VAYAKI, A BADIER, J BLONDEL, A BONNEAUD, G BOUROTTE, J BRAEMS, F BRIENT, JC FOUQUE, G GAMESS, A GUIRLET, R ROSOWSKY, A ROUGE, A RUMPF, M TANAKA, R VIDEAU, H CANDLIN, DJ VEITCH, E PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G CAMPANA, P CAPON, G CHIARELLA, V D'ETTORRE-PIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MASSIMO-BRANCACCIO, F MURTAS, F MURTAS, GP NICOLETTI, G PASSALACQUA, L PEPE-ALTARELLI, M PICCHI, P ZOGRAFOU, P ALTOON, B BOYLE, O HALLEY, AW TEN HAVE, I HEARNS, JL LYNCH, JG MORTON, WT RAINE, C SCARR, JM SMITH, K THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEIGES, R GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M DORNAN, PJ DUGEAY, S GREENE, AM HASSARD, JF LIESKE, NM PATTON, SJ PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TAYLOR, G TOMALIN, IR WRIGHT, AG GIRTLER, P KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G KEEMER, NR NUTTALL, M PATEL, A ROWLINGSON, BS SLOAN, T SNOW, SW WHELAN, EP BARCZEWSKI, T BAUERDICK, LAT KLEINKNECHT, K RENK, B ROEHN, S SANDER, HG SCHMELLING, M SCHMIDT, H STEEG, F ALBANESE, JP AUBERT, JJ BENCHOUK, C BERNARD, V BONISSENT, A COURVOISIER, D ETIENNE, F PAPALEXIOU, S PAYRE, P PIETRZYK, B QIAN, Z BLUM, W CATTANEO, P COWAN, G DEHNING, B DIETL, H FERNANDEZ-BOSMAN, M HANSL-KOZANECKA, T JAHN, A KOZANECK, W LANGE, E LUTJENS, G LUTZ, G MANNER, W MOSER, HG PAN, Y RICHTER, R SCHRODER, J SCHWARZ, AS SETTLES, R STIERLIN, U THOMAS, J WOLF, G BERTIN, V DE BOUARD, G BOUCROT, J CALLOT, O CHEN, X CORDIER, A DAVIER, M GANIS, G GRIVAZ, JF HEUSSE, PH JANOT, P JOURNE, V KIM, DW LEFRANCOIS, J LUTZ, AM VEILLET, JJ VIDEAU, I ZHANG, Z ZOMER, F AMENDOLIA, SR BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BRADASCHIA, C CARPINELLI, M CIOCCI, MA DELL'ORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GIASSI, A GIORGI, MA LIGABUE, F LUSIANI, A MANNELLI, EB MARROCCHESI, PS MESSINEO, A MONETA, L PALLA, F SANGUINETTI, G STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI-CASTALDI, C VENTURI, A VERDINI, PG WALSH, J CARTER, JM GREEN, MG MARCH, PV MEDCALF, T QUAZI, IS SAICH, MR STRONG, JA THOMAS, RM WEST, LR WILDISH, T BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCH-DEVAUX, B COLAS, P KLOPFENSTEIN, C LANCON, E LOCCI, E LOUCATOS, S MONNIER, E PEREZ, P PERRIER, F RANDER, J RENARDY, JF ROUSSARIE, A SCHULLER, JP SCHWINDLING, J ASHMAN, JG BOOTH, CN BUTTAR, C CARNEY, R CARTWRIGHT, S COMBLEY, F DINSDALE, M DOGRU, M HATFIELD, F MARTIN, J PARKER, D REEVES, P THOMPSON, LF BRANDT, S BURKHARDT, H GRUPEN, C MEINHARD, H MIRABITO, L NEUGEBAUER, E SCHAFER, U SEYWERD, H APOLLINARI, G GIANNINI, G GOBBO, B LIELLO, F ROLANDI, L STIEGLER, U BELLANTONI, L BOUDREAU, JF CINABRO, D CONWAY, JS COWEN, DF DEWEERD, AJ FENG, Z FERGUSON, DPS GAO, YS GRAHL, JH HARTON, JL HILGART, J JACOBSEN, JE JARED, RC JOHNSON, RP LECLAIRE, BW PAN, YB PATER, JR SAADI, Y SHARMA, V WALSH, AM WEAR, JA WEBER, FV WHITNEY, MH WU, SLWL ZHOU, ZL ZOBERNIG, G AF DECAMP, D DESCHIZEAUX, B GOY, C LEES, JP MINARD, MN ALEMANY, R CRESPO, JM DELFINO, M FERNANDEZ, E GAITAN, V GARRIDO, LL MATO, P MIQUEL, R MIR, LM ORTEU, S PACHECO, A PERLAS, JA TUBAU, E CATANESI, MG CREANZA, D DE PALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G GAO, Y HU, H HUANG, D LIN, J LOU, J QIAO, C RUAN, T WANG, T XIE, Y XU, D XU, R ZHANG, J ZHAO, W ALBRECHT, H ATWOOD, WB BIRD, F BLUCHER, E BONVICINI, G BOSSI, F BROWN, D BURNETT, TH DREVERMANN, H DYDAK, F FORTY, RW GRAB, C HAGELBERG, R HAYWOOD, S JOST, B KASEMANN, M KELLNER, G KNOBLOCH, J LACOURT, A LEHRAUS, I LOHSE, T LUKE, D MARCHIORO, M MARTINEZ, M MAY, J MENARY, S MINTEN, A MIOTTO, A NASH, J PALAZZI, P RANJARD, F REDLINGER, G ROTH, A ROTHBERG, J ROTSCHEIDT, H VON RUDEN, W ST DENIS, R SCHLATTER, D TAKASHIMA, M TALBY, M TEJESSY, W WACHSMUTH, H WASSERBAECH, S WHEELER, S WIEDENMANN, W WITZELING, W WOTSCHACK, J AJALTOUNI, Z BARDADIN-OTWINOWSKA, M FALVARD, A EL FELLOUS, R GAY, P HARVEY, J HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PRORIOL, J PRULHIERE, F STIMPFL, G HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NIELSEN, ER NILSSON, BS EFTHYMIOPOULOS, I SIMOPOULOU, E VAYAKI, A BADIER, J BLONDEL, A BONNEAUD, G BOUROTTE, J BRAEMS, F BRIENT, JC FOUQUE, G GAMESS, A GUIRLET, R ROSOWSKY, A ROUGE, A RUMPF, M TANAKA, R VIDEAU, H CANDLIN, DJ VEITCH, E PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G CAMPANA, P CAPON, G CHIARELLA, V D'ETTORRE-PIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MASSIMO-BRANCACCIO, F MURTAS, F MURTAS, GP NICOLETTI, G PASSALACQUA, L PEPE-ALTARELLI, M PICCHI, P ZOGRAFOU, P ALTOON, B BOYLE, O HALLEY, AW TEN HAVE, I HEARNS, JL LYNCH, JG MORTON, WT RAINE, C SCARR, JM SMITH, K THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEIGES, R GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M DORNAN, PJ DUGEAY, S GREENE, AM HASSARD, JF LIESKE, NM PATTON, SJ PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TAYLOR, G TOMALIN, IR WRIGHT, AG GIRTLER, P KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G KEEMER, NR NUTTALL, M PATEL, A ROWLINGSON, BS SLOAN, T SNOW, SW WHELAN, EP BARCZEWSKI, T BAUERDICK, LAT KLEINKNECHT, K RENK, B ROEHN, S SANDER, HG SCHMELLING, M SCHMIDT, H STEEG, F ALBANESE, JP AUBERT, JJ BENCHOUK, C BERNARD, V BONISSENT, A COURVOISIER, D ETIENNE, F PAPALEXIOU, S PAYRE, P PIETRZYK, B QIAN, Z BLUM, W CATTANEO, P COWAN, G DEHNING, B DIETL, H FERNANDEZ-BOSMAN, M HANSL-KOZANECKA, T JAHN, A KOZANECK, W LANGE, E LUTJENS, G LUTZ, G MANNER, W MOSER, HG PAN, Y RICHTER, R SCHRODER, J SCHWARZ, AS SETTLES, R STIERLIN, U THOMAS, J WOLF, G BERTIN, V DE BOUARD, G BOUCROT, J CALLOT, O CHEN, X CORDIER, A DAVIER, M GANIS, G GRIVAZ, JF HEUSSE, PH JANOT, P JOURNE, V KIM, DW LEFRANCOIS, J LUTZ, AM VEILLET, JJ VIDEAU, I ZHANG, Z ZOMER, F AMENDOLIA, SR BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BRADASCHIA, C CARPINELLI, M CIOCCI, MA DELL'ORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GIASSI, A GIORGI, MA LIGABUE, F LUSIANI, A MANNELLI, EB MARROCCHESI, PS MESSINEO, A MONETA, L PALLA, F SANGUINETTI, G STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI-CASTALDI, C VENTURI, A VERDINI, PG WALSH, J CARTER, JM GREEN, MG MARCH, PV MEDCALF, T QUAZI, IS SAICH, MR STRONG, JA THOMAS, RM WEST, LR WILDISH, T BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCH-DEVAUX, B COLAS, P KLOPFENSTEIN, C LANCON, E LOCCI, E LOUCATOS, S MONNIER, E PEREZ, P PERRIER, F RANDER, J RENARDY, JF ROUSSARIE, A SCHULLER, JP SCHWINDLING, J ASHMAN, JG BOOTH, CN BUTTAR, C CARNEY, R CARTWRIGHT, S COMBLEY, F DINSDALE, M DOGRU, M HATFIELD, F MARTIN, J PARKER, D REEVES, P THOMPSON, LF BRANDT, S BURKHARDT, H GRUPEN, C MEINHARD, H MIRABITO, L NEUGEBAUER, E SCHAFER, U SEYWERD, H APOLLINARI, G GIANNINI, G GOBBO, B LIELLO, F ROLANDI, L STIEGLER, U BELLANTONI, L BOUDREAU, JF CINABRO, D CONWAY, JS COWEN, DF DEWEERD, AJ FENG, Z FERGUSON, DPS GAO, YS GRAHL, JH HARTON, JL HILGART, J JACOBSEN, JE JARED, RC JOHNSON, RP LECLAIRE, BW PAN, YB PATER, JR SAADI, Y SHARMA, V WALSH, AM WEAR, JA WEBER, FV WHITNEY, MH WU, SLWL ZHOU, ZL ZOBERNIG, G CA ALEPH COLLABORATION TI MEASUREMENT OF ALPHA-S FROM THE STRUCTURE OF PARTICLE CLUSTERS PRODUCED IN HADRONIC Z-DECAYS SO PHYSICS LETTERS B LA English DT Article ID QUANTUM CHROMODYNAMICS; E+E-ANNIHILATION; MONTE-CARLO; QCD AB Using 106 000 hadronic events obtained with the ALEPH detector at LEP at energies close to the Z resonance peak, the strong coupling constant alpha-s is measured by an analysis of energy-energy correlations (EEC) and the global event shape variables thrust. C-parameter and oblateness. It is shown that the theoretical uncertainties can be significantly reduced if the final state particles are first combined in clusters using a minimum scaled invariant mass cut, y(cut), before these variables are computed. The combined result from all shape variables of pre-clustered events is alpha-s(M(Z)2) = 0.117 +/- 0.005 for a renormalization scale mu = 1/2M(Z). For mu-values between M(Z) and the b-quark mass, the result changes by -0.009(+0.006). C1 CNRS, IN2P3, LAB PHYS PARTICULES LAPP, F-74019 ANNECY LE VIEUX, FRANCE. UNIV AUTONOMA BARCELONA, LAB FIS ALTAS ENERGIAS, E-08193 BARCELONA, SPAIN. IST NAZL FIS NUCL, SEZ BARI, I-70126 BARI, ITALY. UNIV BARI, DIPARTIMENTO FIS, I-70126 BARI, ITALY. ACAD SINICA, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. UNIV BLAISE PASCAL, CNRS, IN2P3, LAB PHYS CORPUSCULAIRE, F-63177 AUBIERE, FRANCE. NIELS BOHR INST, DK-2100 COPENHAGEN, DENMARK. NUCL RES CTR DEMOKRITOS, ATHENS, GREECE. ECOLE POLYTECH, CNRS, IN2P3, LAB PHYS NUCL & HAUTES ENERGIES, F-91128 PALAISEAU, FRANCE. UNIV EDINBURGH, DEPT PHYS, EDINBURGH EH9 3JZ, MIDLOTHIAN, SCOTLAND. UNIV FIRENZE, DIPARTIMENTO FIS, I-50125 FLORENCE, ITALY. IST NAZL FIS NUCL, SEZ FIRENZE, I-50125 FLORENCE, ITALY. FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA. FLORIDA STATE UNIV, DEPT PHYS, TALLAHASSEE, FL 32306 USA. IST NAZL FIS NUCL, LNF, I-00044 FRASCATI, ITALY. UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, LANARK, SCOTLAND. UNIV HEIDELBERG, INST HOCHENERGIEPHYS, W-6900 HEIDELBERG, GERMANY. IMPERIAL COLL, DEPT PHYS, LONDON SW7 2BZ, ENGLAND. UNIV INNSBRUCK, INST EXPT PHYS, A-6020 INNSBRUCK, AUSTRIA. UNIV LANCASTER, DEPT PHYS, LANCASTER LA1 4YB, ENGLAND. UNIV MAINZ, INST PHYS, W-6500 MAINZ, GERMANY. CNRS, IN2P3, FAC SCI LUMINY, CTR PHYS PARTICULES, F-13288 MARSEILLE, FRANCE. WERNER HEISENBERG INST PHYS, MAX PLANCK INST PHYS & ASTROPHYS, W-8000 MUNICH, GERMANY. UNIV PARIS SUD, CNRS, IN2P3, LAB ACCELERATEUR LINEAIRE, F-91405 ORSAY, FRANCE. UNIV PISA, DIPARTIMENTO FIS, INFN, SEZ PISA, I-56010 PISA, ITALY. SCUOLA NORMALE SUPER, I-56010 PISA, ITALY. UNIV LONDON, ROYAL HOLLOWAY & BEDFORD NEW COLL, DEPT PHYS, SURREY TW20 0EX, ENGLAND. RUTHERFORD APPLETON LAB, PARTICLE PHYS DEPT, DIDCOT OX11 0QX, OXON, ENGLAND. CEN SACLAY, DEPT PHYS PARTICULES ELEMENTAIRES, F-91191 GIF SUR YVETTE, FRANCE. UNIV SHEFFIELD, DEPT PHYS, SHEFFIELD S3 7RH, ENGLAND. UNIV SIEGEN, FACHBEREICH PHYS, W-5900 SIEGEN, GERMANY. UNIV TRIESTE, DIPARTIMENTO FIS, I-34127 TRIESTE, ITALY. IST NAZL FIS NUCL, SEZ TRIESTE, I-34127 TRIESTE, ITALY. UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA. LBL, BERKELEY, CA 94720 USA. UNIV TORINO, IST FIS GEN, TURIN, ITALY. CNR, IST COSMO GEOFIS, I-10133 TURIN, ITALY. FAC SCI, CTR PHYS PARTICULES, F-13288 MARSEILLE 9, FRANCE. DESY, W-2000 HAMBURG, GERMANY. RP DECAMP, D (reprint author), CNRS, IN2P3, LAB PHYS PARTICULES LAPP, F-74019 ANNECY LE VIEUX, FRANCE. RI Booth, Christopher/B-5263-2016; Delfino, Manuel/A-1545-2012; Pacheco Pages, Andres/C-5353-2011; Ferrante, Isidoro/F-1017-2012; Ligabue, Franco/F-3432-2014; Marrocchesi, Pier Simone/N-9068-2015; Forti, Francesco/H-3035-2011; Lusiani, Alberto/A-3329-2016; Murtas, Fabrizio/B-5729-2012; Venturi, Andrea/J-1877-2012; Rolandi, Luigi (Gigi)/E-8563-2013; Colas, Paul/F-2876-2013; Bosman, Martine/J-9917-2014; Fernandez, Enrique/L-5387-2014; Mir, Lluisa-Maria/G-7212-2015; ciocci, maria agnese /I-2153-2015; Lusiani, Alberto/N-2976-2015 OI Booth, Christopher/0000-0002-6051-2847; Delfino, Manuel/0000-0002-9468-4751; Pacheco Pages, Andres/0000-0001-8210-1734; Ferrante, Isidoro/0000-0002-0083-7228; Palazzi, Paolo/0000-0002-4861-391X; RASO, Giuseppe/0000-0002-5660-3711; Bottigli, Ubaldo/0000-0002-0666-3433; Ligabue, Franco/0000-0002-1549-7107; Bloch-Devaux, Brigitte/0000-0002-2463-1232; Marrocchesi, Pier Simone/0000-0003-1966-140X; Forti, Francesco/0000-0001-6535-7965; Lusiani, Alberto/0000-0002-6876-3288; Rolandi, Luigi (Gigi)/0000-0002-0635-274X; Bosman, Martine/0000-0002-7290-643X; Fernandez, Enrique/0000-0002-6405-9488; Mir, Lluisa-Maria/0000-0002-4276-715X; ciocci, maria agnese /0000-0003-0002-5462; Lusiani, Alberto/0000-0002-6876-3288 NR 29 TC 42 Z9 42 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 28 PY 1991 VL 257 IS 3-4 BP 479 EP 491 DI 10.1016/0370-2693(91)91926-M PG 13 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FG039 UT WOS:A1991FG03900040 ER PT J AU DECAMP, D DESCHIZEAUX, B GOY, C LEES, JP MINARD, MN ALEMANY, R CRESPO, JM DELFINO, M FERNANDEZ, E GAITAN, V GARRIDO, L MATO, P MIQUEL, R MIR, LM ORTEU, S PACHECO, A PERLAS, JA TUBAU, E CATANESI, MG CREANZA, D DE PALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G GAO, Y HU, H HUANG, D HUANG, X LIN, J LOU, J QIAO, C RUAN, T WANG, T XIE, Y XU, D XU, R ZHANG, J ZHAO, W ALBRECHT, H ATWOOD, WB BIRD, F BLUCHER, E BONVICINI, G BOSSI, F BROWN, D BURNETT, TH DREVERMANN, H DYDAK, F FORTY, RW GRAB, C HAGELBERG, R HAYWOOD, S JOST, B KASEMANN, M KELLNER, G KNOBLOCH, J LACOURT, A LEHRAUS, I LOHSE, T LUKE, D MARCHIORO, A MARCHIORO, M MAY, J MENARY, S MINTEN, A MIOTTO, A NASH, J PALAZZI, P RANJARD, F REDLINGER, G ROTH, A ROTHBERG, J ROTSCHEIDT, H VON RUDEN, W ST DENIS, R SCHLATTER, D TAKASHIMA, M TALBY, M TEJESSY, W WACHSMUTH, H WASSERBAECH, S WHEELER, S WIEDENMANN, W WITZELING, W WOTSCHACK, J AJALTOUNI, Z BARDADIN-OTWINOWSKA, M FALVARD, A EL FELLOUS, R GAY, P HARVEY, J HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PRORIOL, J PRULHIERE, F STIMPFL, G HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NIELSEN, ER NILSSON, BS EFTHYMIOPOULO, I SIMOPOULOU, E VAYAKI, A BADIER, J BLONDEL, A BONNEAUD, G BOUROTTE, J BRAEMS, F BRIENT, JC FOUQUE, G GAMESS, A GUIRLET, R ROSOWSKY, A ROUGE, A RUMPF, M TANAKA, R VIDEAU, H CANDLIN, DJ VEITCH, E PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G CAMPANA, P CAPON, G CHIARELLA, V D'ETTORRE-PIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MASSIMO-BRANCACCIO, F MURTAS, F MURTAS, GP NICOLETTI, G PASSALACQUA, L PEPE-ALTARELLI, M PICCHI, P ZOGRAFOU, P ALTOON, B BOYLE, O HALLEY, AW TEN HAVE, I HEARNS, JL LYNCH, JG MORTON, WT RAINE, C SCARR, JM SMITH, K THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEIGES, R GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, W DORNAN, PJ DUGEAY, S GREENE, AM HASSARD, JF LIESKE, NM PATTON, SJ PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TAYLOR, G TOMALIN, IR WRIGHT, AG GIRTLER, P KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G KEEMER, NR NUTTALL, M PATEL, A ROWLINGSON, BS SLOAN, T SNOW, SW WHELAN, EP BARCZEWSKI, T BAUERDICK, LAT KLEINKNECHT, K RENK, B ROEHN, S SANDER, HG SCHMELLING, M SCHMIDT, H STEEG, F ALBANESE, JP AUBERT, JJ BENCHOUK, C BERNARD, V BONISSENT, A COURVOISIER, D ETIENNE, F PAPALEXIOU, S PAYRE, P PIETRZYK, B QIAN, Z BLUM, W CATTANEO, P COWAN, G DEHNING, B DIETL, H FERNANDEZ-BOSMAN, M HANSL-KOZANECKA, T JAHN, A KOZANECK, W LANGE, E LUTJENS, G LUTZ, G MANNER, W MOSER, HG PAN, Y RICHTER, R SCHRODER, J SCHWARZ, AS SETTLES, R STIERLIN, U THOMAS, J WOLF, G BERTIN, V DE BOUARD, G BOUCROT, J CALLOT, O CHEN, X CORDIER, A DAVIER, M GANIS, G GRIVAZ, JF HEUSSE, P JANOT, P JOURNE, V KIM, DW LEFRANCOI, J LUTZ, JM VEILLET, JJ VIDEAU, I ZHANG, Z ZOMER, F AMENDOLIA, SR BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BRADASCHIA, C CARPINELLI, M CIOCCI, MA DELL'ORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GIASSI, A GIORGI, MA LIGABUE, F LUSIANI, A MANNELLI, EB MARROCCHESI, PS MESSINEO, A MONETA, L PALLA, F SANGUINETTI, G STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI-CASTALDI, C VENTURI, A VERDINI, PG WALSH, J CARTER, JM GREEN, MG MARCH, PV MEDCALF, T QUAZI, IS SAICH, MR STRONG, JA THOMAS, RM WEST, LR WILDISH, T BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR NORTON, DP THOMPSON, JC BLOCH-DEVAUX, B COLAS, P KLOPFENSTEIN, C LANCON, E LOCCI, E LOUCATOS, S MONNIER, E PEREZ, P PEREZ, F RANDER, J RENARDY, JF ROUSSARIE, A SCHULLER, JP SCHWINDLING, J ASHAN, JG BOOTH, CN BUTTAR, C CARNEY, R CARTWRIGHT, S COMBLEY, F DINSDALE, M DOGRU, M HATFIELD, F MARTIN, J PARKER, D REEVES, P THOMPSON, LF BRANDT, S BURKHARDT, H GRUPEN, C MEINHARD, H MIRABITO, L NEUGEBAUER, E SCHAFER, U SEYWERD, H APOLLINARI, G GIANNINI, G GOBBO, B LIELLO, F ROLANDI, L STIEGLER, U BELLANTONI, L BOUDREAU, JF CINABRO, D CONWAY, JS COWEN, DF DEWEERD, AJ FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL HILGART, J JACOBSEN, JE JARED, RC JOHNSON, RP LECLAIRE, BW PAN, YB PATER, JR SAADI, Y SHARMA, V WALSH, MA WEAR, JA WEBER, FV WHITNEY, MH WU, SLWL ZHOU, ZL ZOBERNIG, G AF DECAMP, D DESCHIZEAUX, B GOY, C LEES, JP MINARD, MN ALEMANY, R CRESPO, JM DELFINO, M FERNANDEZ, E GAITAN, V GARRIDO, L MATO, P MIQUEL, R MIR, LM ORTEU, S PACHECO, A PERLAS, JA TUBAU, E CATANESI, MG CREANZA, D DE PALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G GAO, Y HU, H HUANG, D HUANG, X LIN, J LOU, J QIAO, C RUAN, T WANG, T XIE, Y XU, D XU, R ZHANG, J ZHAO, W ALBRECHT, H ATWOOD, WB BIRD, F BLUCHER, E BONVICINI, G BOSSI, F BROWN, D BURNETT, TH DREVERMANN, H DYDAK, F FORTY, RW GRAB, C HAGELBERG, R HAYWOOD, S JOST, B KASEMANN, M KELLNER, G KNOBLOCH, J LACOURT, A LEHRAUS, I LOHSE, T LUKE, D MARCHIORO, A MARCHIORO, M MAY, J MENARY, S MINTEN, A MIOTTO, A NASH, J PALAZZI, P RANJARD, F REDLINGER, G ROTH, A ROTHBERG, J ROTSCHEIDT, H VON RUDEN, W ST DENIS, R SCHLATTER, D TAKASHIMA, M TALBY, M TEJESSY, W WACHSMUTH, H WASSERBAECH, S WHEELER, S WIEDENMANN, W WITZELING, W WOTSCHACK, J AJALTOUNI, Z BARDADIN-OTWINOWSKA, M FALVARD, A EL FELLOUS, R GAY, P HARVEY, J HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PRORIOL, J PRULHIERE, F STIMPFL, G HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NIELSEN, ER NILSSON, BS EFTHYMIOPOULO, I SIMOPOULOU, E VAYAKI, A BADIER, J BLONDEL, A BONNEAUD, G BOUROTTE, J BRAEMS, F BRIENT, JC FOUQUE, G GAMESS, A GUIRLET, R ROSOWSKY, A ROUGE, A RUMPF, M TANAKA, R VIDEAU, H CANDLIN, DJ VEITCH, E PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G CAMPANA, P CAPON, G CHIARELLA, V D'ETTORRE-PIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MASSIMO-BRANCACCIO, F MURTAS, F MURTAS, GP NICOLETTI, G PASSALACQUA, L PEPE-ALTARELLI, M PICCHI, P ZOGRAFOU, P ALTOON, B BOYLE, O HALLEY, AW TEN HAVE, I HEARNS, JL LYNCH, JG MORTON, WT RAINE, C SCARR, JM SMITH, K THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEIGES, R GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, W DORNAN, PJ DUGEAY, S GREENE, AM HASSARD, JF LIESKE, NM PATTON, SJ PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TAYLOR, G TOMALIN, IR WRIGHT, AG GIRTLER, P KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G KEEMER, NR NUTTALL, M PATEL, A ROWLINGSON, BS SLOAN, T SNOW, SW WHELAN, EP BARCZEWSKI, T BAUERDICK, LAT KLEINKNECHT, K RENK, B ROEHN, S SANDER, HG SCHMELLING, M SCHMIDT, H STEEG, F ALBANESE, JP AUBERT, JJ BENCHOUK, C BERNARD, V BONISSENT, A COURVOISIER, D ETIENNE, F PAPALEXIOU, S PAYRE, P PIETRZYK, B QIAN, Z BLUM, W CATTANEO, P COWAN, G DEHNING, B DIETL, H FERNANDEZ-BOSMAN, M HANSL-KOZANECKA, T JAHN, A KOZANECK, W LANGE, E LUTJENS, G LUTZ, G MANNER, W MOSER, HG PAN, Y RICHTER, R SCHRODER, J SCHWARZ, AS SETTLES, R STIERLIN, U THOMAS, J WOLF, G BERTIN, V DE BOUARD, G BOUCROT, J CALLOT, O CHEN, X CORDIER, A DAVIER, M GANIS, G GRIVAZ, JF HEUSSE, P JANOT, P JOURNE, V KIM, DW LEFRANCOI, J LUTZ, JM VEILLET, JJ VIDEAU, I ZHANG, Z ZOMER, F AMENDOLIA, SR BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BRADASCHIA, C CARPINELLI, M CIOCCI, MA DELL'ORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GIASSI, A GIORGI, MA LIGABUE, F LUSIANI, A MANNELLI, EB MARROCCHESI, PS MESSINEO, A MONETA, L PALLA, F SANGUINETTI, G STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI-CASTALDI, C VENTURI, A VERDINI, PG WALSH, J CARTER, JM GREEN, MG MARCH, PV MEDCALF, T QUAZI, IS SAICH, MR STRONG, JA THOMAS, RM WEST, LR WILDISH, T BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR NORTON, DP THOMPSON, JC BLOCH-DEVAUX, B COLAS, P KLOPFENSTEIN, C LANCON, E LOCCI, E LOUCATOS, S MONNIER, E PEREZ, P PEREZ, F RANDER, J RENARDY, JF ROUSSARIE, A SCHULLER, JP SCHWINDLING, J ASHAN, JG BOOTH, CN BUTTAR, C CARNEY, R CARTWRIGHT, S COMBLEY, F DINSDALE, M DOGRU, M HATFIELD, F MARTIN, J PARKER, D REEVES, P THOMPSON, LF BRANDT, S BURKHARDT, H GRUPEN, C MEINHARD, H MIRABITO, L NEUGEBAUER, E SCHAFER, U SEYWERD, H APOLLINARI, G GIANNINI, G GOBBO, B LIELLO, F ROLANDI, L STIEGLER, U BELLANTONI, L BOUDREAU, JF CINABRO, D CONWAY, JS COWEN, DF DEWEERD, AJ FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL HILGART, J JACOBSEN, JE JARED, RC JOHNSON, RP LECLAIRE, BW PAN, YB PATER, JR SAADI, Y SHARMA, V WALSH, MA WEAR, JA WEBER, FV WHITNEY, MH WU, SLWL ZHOU, ZL ZOBERNIG, G CA ALEPH COLLABORATION TI MEASUREMENT OF THE B-HADRON LIFETIME SO PHYSICS LETTERS B LA English DT Article ID E+E ANNIHILATION; ENERGIES AB The average lifetime of B hadrons has been measured by the ALEPH experiment at LEP. Events containing B hadrons are selected by the identification of leptons with high transverse momentum in hadronic Z decays, and the lifetime is extracted from a fit to the impact parameter distribution of the lepton tracks. From a sample of 1.7 x 10(5) hadronic Z decays a lifetime of 1.29 +/- 0.06 +/- 0.10 ps is measured. C1 CNRS, IN2P3, F-74019 ANNECY LE VIEUX, FRANCE. CNRS, LAB PHYS PARTICULES LAPP, F-74019 ANNECY LE VIEUX, FRANCE. UNIV AUTONOMA BARCELONA, LAB FIS ALTAS ENERGIAS, E-08193 BARCELONA, SPAIN. IST NAZL FIS NUCL, SEZ BARI, I-70126 BARI, ITALY. UNIV BARI, DIPARTIMENTO FIS, I-70126 BARI, ITALY. ACAD SINICA, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA, SWITZERLAND. UNIV BLAISE PASCAL, CNRS, IN2P3, LAB PHYS CORPUSCULAIRE, F-63177 AUBIERE, FRANCE. NIELS BOHR INST, DK-2100 COPENHAGEN, DENMARK. NUCL RESH CTR DEMOKRITOS, ATHENS, GREECE. ECOLE POLYTECH, CNRS, IN2P3, LAB PHYS NUCL & HAUTES ENERGIES, F-91128 PALAISEAU, FRANCE. UNIV EDINBURGH, DEPT PHYS, EDINBURGH EH9 3JZ, MIDLOTHIAN, SCOTLAND. UNIV FIRENZE, DIPARTIMENTO FIS, I-50125 FLORENCE, ITALY. IST NAZL FIS NUCL, SEZ FIRENZE, I-50125 FLORENCE, ITALY. FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA. FLORIDA STATE UNIV, DEPT PHYS, TALLAHASSEE, FL 32306 USA. LNF, IST NAZL FIS NUCL, I-00044 FRASCATI, ITALY. UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, LANARK, SCOTLAND. UNIV HEIDELBERG, INST HOCHENERGIEPHYS, W-6900 HEIDELBERG, GERMANY. IMPERIAL COLL, DEPT PHYS, LONDON SW7 2BZ, ENGLAND. UNIV INNSBRUCK, INST EXPT PHYS, A-6020 INNSBRUCK, AUSTRIA. UNIV LANCASTER, DEPT PHYS, LANCASTER LA1 4YB, ENGLAND. UNIV MAINZ, INST PHYS, W-6500 MAINZ, GERMANY. FAC SCI LUMINY, CNRS, IN2P3, CTR PHYS PARTICULES, F-13288 MARSEILLE, FRANCE. WERNER HEISENBERG INST PHYS, MAX PLANCK INST PHYS & ASTROPHYS, W-8000 MUNICH, GERMANY. UNIV PARIS SUD, CNRS, IN2P3, LAB ACCELERATEUR LINEAIRE, F-91405 ORSAY, FRANCE. UNIV PISA, DIPARTIMENTO FIS, INFN, SEZ PISA, I-56010 PISA, ITALY. UNIV LONDON, ROYAL HOLLOWAY & BEDFORD NEW COLL, DEPT PHYS, SURREY TW20 0EX, ENGLAND. RUTHERFORD APPLETON LAB, PARTICLE PHYS DEPT, DIDCOT OX11 0QX, OXON, ENGLAND. CEN SACLAY, DEPT PHYS PARTICULES ELEMENTAIRES, F-91191 GIF SUR YVETTE, FRANCE. UNIV SHEFFIELD, DEPT PHYS, SHEFFIELD S3 7RH, ENGLAND. UNIV SIEGEN, FACHBEREICH PHYS, W-5900 SIEGEN, GERMANY. UNIV TRIESTE, DIPARTIMENTO FIS, I-34127 TRIESTE, ITALY. IST NAZL FIS NUCL, SEZ TRIESTE, I-34127 TRIESTE, ITALY. UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA. DESY, W-2000 HAMBURG, GERMANY. FAC SCI, CTR PHYS PARTICULES, F-13288 MARSEILLE 9, FRANCE. UNIV TORINO, IST FIS GEN, TURIN, ITALY. CNR, IST COSMO GEOFIS, I-10133 TURIN, ITALY. LBL, BERKELEY, CA 94720 USA. RP DECAMP, D (reprint author), CNRS, IN2P3, F-74019 ANNECY LE VIEUX, FRANCE. RI Booth, Christopher/B-5263-2016; Delfino, Manuel/A-1545-2012; Pacheco Pages, Andres/C-5353-2011; Ferrante, Isidoro/F-1017-2012; Ligabue, Franco/F-3432-2014; Murtas, Fabrizio/B-5729-2012; Venturi, Andrea/J-1877-2012; Rolandi, Luigi (Gigi)/E-8563-2013; Colas, Paul/F-2876-2013; Bosman, Martine/J-9917-2014; Fernandez, Enrique/L-5387-2014; Mir, Lluisa-Maria/G-7212-2015; ciocci, maria agnese /I-2153-2015; Lusiani, Alberto/N-2976-2015; Marrocchesi, Pier Simone/N-9068-2015; Forti, Francesco/H-3035-2011; Lusiani, Alberto/A-3329-2016; OI Booth, Christopher/0000-0002-6051-2847; Delfino, Manuel/0000-0002-9468-4751; Pacheco Pages, Andres/0000-0001-8210-1734; Ferrante, Isidoro/0000-0002-0083-7228; Palazzi, Paolo/0000-0002-4861-391X; RASO, Giuseppe/0000-0002-5660-3711; Bottigli, Ubaldo/0000-0002-0666-3433; Ligabue, Franco/0000-0002-1549-7107; Bloch-Devaux, Brigitte/0000-0002-2463-1232; Rolandi, Luigi (Gigi)/0000-0002-0635-274X; Bosman, Martine/0000-0002-7290-643X; Fernandez, Enrique/0000-0002-6405-9488; Mir, Lluisa-Maria/0000-0002-4276-715X; ciocci, maria agnese /0000-0003-0002-5462; Lusiani, Alberto/0000-0002-6876-3288; Marrocchesi, Pier Simone/0000-0003-1966-140X; Forti, Francesco/0000-0001-6535-7965; Lusiani, Alberto/0000-0002-6876-3288; Murtas, Fabrizio/0000-0002-7041-6541; Garrido Beltran, Lluis/0000-0001-8883-6539; Edgecock, Rob/0000-0002-7896-3312 NR 17 TC 20 Z9 20 U1 0 U2 5 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 MAR 28 PY 1991 VL 257 IS 3-4 BP 492 EP 504 DI 10.1016/0370-2693(91)91927-N PG 13 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FG039 UT WOS:A1991FG03900041 ER PT J AU WALCZAK, MM CHUNG, CK STOLE, SM WIDRIG, CA PORTER, MD AF WALCZAK, MM CHUNG, CK STOLE, SM WIDRIG, CA PORTER, MD TI STRUCTURE AND INTERFACIAL PROPERTIES OF SPONTANEOUSLY ADSORBED NORMAL-ALKANETHIOLATE MONOLAYERS ON EVAPORATED SILVER SURFACES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID ORGANIZED MOLECULAR ASSEMBLIES; OXIDIZED ALUMINUM SURFACE; NORMAL-ALKANOIC ACIDS; GOLD SURFACES; FILMS; OXYGEN; ADSORPTION; ELECTRODES; SPECTROSCOPY; DIFFRACTION AB Monolayer films of n-alkanethiols (CH3(CH2)n(SH), n = 3-15, 17) have been spontaneously adsorbed from solution at evaporated Ag films. These monolayers have been characterized with optical ellipsometry, contact angle measurements, and external reflection infrared spectroscopy (IRS). The IRS data indicate that the monolayers with long chains (n greater-than-or-equal-to 10) are predominantly densely packed, crystalline-like structures with all-trans conformational sequences exhibiting average tilts of approximately 13-degrees from the surface normal. Although less clearly defined, the collective results from all three characterization methods point to a comparably tilted structure for the shorter chain monolayers. The chain tilts at Ag are markedly different from the approximately 30-degrees tilts for long-chain n-alkanethiolate monolayers at Au,4,10 indicating a difference in the bonding of the sulfur head group at the two metals. For short-chain monolayers, the offset of an odd-even effect by one methylene group at Ag with respect to Au for both the contact angle and IRS data further supports this conclusion. Models that are based on the crystallinity and the electronic properties of the two substrates are presented as possible explanations of the observed structures. These results demonstrate the potential of long-chain thiolate monolayers at Ag as a model molecular system for unraveling the complexities of a variety of interfacial processes. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 64 TC 383 Z9 386 U1 5 U2 46 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 MAR 27 PY 1991 VL 113 IS 7 BP 2370 EP 2378 DI 10.1021/ja00007a004 PG 9 WC Chemistry, Multidisciplinary SC Chemistry GA FD837 UT WOS:A1991FD83700004 ER PT J AU VANDERSLUYS, LS MILLER, MM KUBAS, GJ CAULTON, KG AF VANDERSLUYS, LS MILLER, MM KUBAS, GJ CAULTON, KG TI DEPROTONATION OF UNCHARGED TRANSITION-METAL DIHYDROGEN COMPLEXES WITH COPPER ALKOXIDES, CHARACTERIZATION OF THE HETEROMETALLIC COMPLEXES (PR3)XFEHYCU(PR3), (PR3)XWHYCU(PR3) AND X-RAY CRYSTAL-STRUCTURE OF (PETPH2)3FEH3CU(PETPH2) SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID MOLECULAR-HYDROGEN COMPLEXES; HYDRIDO-BRIDGED COMPLEXES; CUPROUS TERT-BUTOXIDE; IRON CLUSTERS; H-H; GOLD; LIGANDS; SILVER; AUCR(MU-H)(CO)5(PPH3); POLYHYDRIDES AB Reaction of FeH2(eta-2-H-2)(PEtPh2)3 (1) or W(eta-2-H-2)(CO)3(PR3)2 (PR3 = P(C6H11)3 (2a), P(i-Pr)3 (2b), P(C5H9)3 (2c), P(i-Pr)(C6H11)2 (2d) with 1/4[CuO-t-Bu]4 or 1/2[Cu(O-t-Bu)(PR3)]2 (PR3 = PPh3, P(C6H11)3, or PPh2Et) results in deprotonation and concomitant elimination of HO-t-Bu. Characterization and reactivity studies of the bimetallic products (PEtPh2)3Fe(mu-H)3Cu(PEtPh2) (3) and (PR3)2(CO)3W(mu-H)Cu(PR3) (PR3 = P(C6H11)3 (4a), P(i-Pr)3 (4b), and P(C5H9)3 (4c)) are described, including an X-ray crystallographic study of 3. The latter complex consists of a facial P3FeH3 moiety, bridged by three hydrides to a Cu-P fragment with an Fe-Cu distance of 2.319 (1) angstrom. Crystal data for 3 (233-degrees-K): a = 10.872 (2) angstrom, b = 18.512 (4) angstrom, c = 12.647 (3) angstrom, beta = 94.10 (3)-degrees, and Z = 2 in space group P2(1). C1 LOS ALAMOS NATL LAB,INORGAN & STRUCT CHEM GRP,INC-4,LOS ALAMOS,NM 87545. COLORADO STATE UNIV,DEPT CHEM,FT COLLINS,CO 80523. INDIANA UNIV,DEPT CHEM,BLOOMINGTON,IN 47405. NR 47 TC 39 Z9 39 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 MAR 27 PY 1991 VL 113 IS 7 BP 2513 EP 2520 DI 10.1021/ja00007a027 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA FD837 UT WOS:A1991FD83700027 ER PT J AU KOL, M ROZEN, S APPELMAN, E AF KOL, M ROZEN, S APPELMAN, E TI ISOLATION AND CHARACTERIZATION OF METHYL HYPOFLUORITE (CH3OF) SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID ACETYL HYPOFLUORITE; ELECTROPHILIC FLUORINATION; ELEMENTAL FLUORINE; FLUOROXY COMPOUNDS; ORGANIC-COMPOUNDS; ACID; EXISTENCE; CHEMISTRY; SPECTRA; HOF AB Methyl hypofluorite (CH3OF) has been prepared by the reaction of elemental fluorine with methanol in acetonitrile or propionitrile at low temperature. It was removed from the reaction mixture in a stream of nitrogen and purified by fractional distillation. The compound is moderately long-lived, although the liquid has exploded upon rapid warming. The liquid compound has a freezing point of about -142-degrees-C, and vapor pressure measurements indicate a normal boiling point of -32.6 +/- 0.9-degree-C and an enthalpy of vaporization of 23.37 +/- 0.26 kJ/mol. The infrared spectrum of the vapor is consistent with the molecule being isostructural with CH3OH and CF3OF. The compound has also been characterized by mass spectrometry and by H-1, F-19, and C-13 NMR spectrometries. This novel reagent adds across various double bonds to form the corresponding fluoro methoxy adducts, which are not easily accessible by other methods. C1 TEL AVIV UNIV,RAYMOND & BEVERLY SACKLER FAC EXACT SCI,SCH CHEM,IL-69978 TEL AVIV,ISRAEL. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RI Rozen, Shlomo/C-7619-2016 NR 35 TC 39 Z9 39 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAR 27 PY 1991 VL 113 IS 7 BP 2648 EP 2651 DI 10.1021/ja00007a043 PG 4 WC Chemistry, Multidisciplinary SC Chemistry GA FD837 UT WOS:A1991FD83700043 ER PT J AU MENDEL, D ELLMAN, JA SCHULTZ, PG AF MENDEL, D ELLMAN, JA SCHULTZ, PG TI CONSTRUCTION OF A LIGHT-ACTIVATED PROTEIN BY UNNATURAL AMINO-ACID MUTAGENESIS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID OLIGONUCLEOTIDE-DIRECTED MUTAGENESIS; BIOLOGICALLY USEFUL CHELATORS; SITE-SPECIFIC INCORPORATION; 5'-3' EXONUCLEASES; ILLUMINATION; CA-2+ C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. RI Ellman, Jonathan/C-7732-2013 NR 27 TC 118 Z9 118 U1 0 U2 11 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 MAR 27 PY 1991 VL 113 IS 7 BP 2758 EP 2760 DI 10.1021/ja00007a063 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA FD837 UT WOS:A1991FD83700063 ER PT J AU WASIELEWSKI, MR ONEIL, MP LYKKE, KR PELLIN, MJ GRUEN, DM AF WASIELEWSKI, MR ONEIL, MP LYKKE, KR PELLIN, MJ GRUEN, DM TI TRIPLET-STATES OF FULLERENES C60 AND C70 - ELECTRON-PARAMAGNETIC RESONANCE-SPECTRA, PHOTOPHYSICS, AND ELECTRONIC-STRUCTURES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID TRANS-BETA-CAROTENE; CARBON-ATOMS; NORMAL-MODES; C-60; BUCKMINSTERFULLERENE; MOLECULES; LIFETIME C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP WASIELEWSKI, MR (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. RI Pellin, Michael/B-5897-2008 OI Pellin, Michael/0000-0002-8149-9768 NR 26 TC 301 Z9 302 U1 2 U2 23 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 MAR 27 PY 1991 VL 113 IS 7 BP 2774 EP 2776 DI 10.1021/ja00007a074 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA FD837 UT WOS:A1991FD83700074 ER PT J AU HIGHFIELD, JG PRAIRIE, M RENKEN, A AF HIGHFIELD, JG PRAIRIE, M RENKEN, A TI INSITU DRIFT SPECTROSCOPY IN A CONTINUOUS RECYCLE REACTOR - A VERSATILE TOOL FOR CATALYTIC PROCESS RESEARCH SO CATALYSIS TODAY LA English DT Article; Proceedings Paper CT MEETING OF THE SURFACE REACTIVITY AND CATALYSIS GROUP OF THE ROYAL SOC OF CHEMISTRY : IN SITU METHODS IN CATALYSIS CY SEP 17-19, 1991 CL READING, ENGLAND SP ROYAL SOC CHEM, SURFACE REACT & CATALYSIS GRP ID CARBON-DIOXIDE; CO; HYDROGENATION; SILICA; IR; METHANATION; ADSORPTION; RUTHENIUM; SURFACES; METALS AB Diffuse Reflectance Infrared Fourier-Transform (DRIFT) spectroscopy is an increasingly popular technique in catalysis research as it permits in-situ observation of the reactor bed in powdered or granular form. However, DRIFTS in its conventional form suffers from temperature-gradient problems. One solution is to couple the DRIFTS cell with a continuous recycle flow system. The value of such an arrangement is illustrated via studies, of the kinetics and mechanism of CO2 methanation over Ru/TiO2 under transient and steady-state conditions. Metal-absorbed CO is identified as the main reaction intermediate through titration to CH4 in transient hydrogenation. The CO(ad) is probably supplied via rapid establishment of the reverse water gas shift equilibrium: H2 + CO2 --> CO(ad) + H2O involving adsorbed formate intermediate(s). C1 PAUL SCHERRER INST,CH-5232 VILLIGEN,SWITZERLAND. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. SWISS FED INST TECHNOL,CH-1015 LAUSANNE,SWITZERLAND. RI Highfield, James/O-8523-2015 NR 31 TC 16 Z9 16 U1 4 U2 15 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5861 J9 CATAL TODAY JI Catal. Today PD MAR 26 PY 1991 VL 9 IS 1-2 BP 39 EP 46 DI 10.1016/0920-5861(91)85005-S PG 8 WC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA FX006 UT WOS:A1991FX00600006 ER PT J AU CHAN, KT KIRSCHBAUM, CL YU, KM AF CHAN, KT KIRSCHBAUM, CL YU, KM TI ANALYSIS OF PSEUDOMORPHIC GAAS/INGAAS/ALGAAS MODULATION-DOPED FIELD-EFFECT TRANSISTOR STRUCTURES BY SECONDARY-ION MASS-SPECTROMETRY AND ION CHANNELING SO APPLIED PHYSICS LETTERS LA English DT Article AB Secondary-ion mass spectrometry has been used to analyze the Al and In depth profiles in pseudomorphic GaAs/InGaAs/AlGaAs modulation-doped field-effect transistor structures. Surface segregation of In was found on the upper interface of the strained InGaAs layer under a moderate growth temperature of 510-degrees-C. The segregation effect was found to be suppressed when the As4 overpressure was doubled. Ion channeling measurements are capable of differentiating the coherency of the strained InGaAs layer in the samples studied. A correlation was found between the coherency of the layer and its electrical transport property. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720. CHARLES EVANS & ASSOCIATES,REDWOOD CITY,CA 94063. RI Yu, Kin Man/J-1399-2012 OI Yu, Kin Man/0000-0003-1350-9642 NR 9 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 MAR 25 PY 1991 VL 58 IS 12 BP 1305 EP 1307 DI 10.1063/1.104344 PG 3 WC Physics, Applied SC Physics GA FD368 UT WOS:A1991FD36800028 ER PT J AU COOKE, DW ARENDT, PN GRAY, ER BENNETT, BL BROWN, DR ELLIOTT, NE REEVES, GA ROLLETT, AD HUBBARD, KM PORTIS, AM AF COOKE, DW ARENDT, PN GRAY, ER BENNETT, BL BROWN, DR ELLIOTT, NE REEVES, GA ROLLETT, AD HUBBARD, KM PORTIS, AM TI MICROWAVE-POWER ABSORPTION BY THALLIUM-BASED SUPERCONDUCTORS ON METALLIC SUBSTRATES SO APPLIED PHYSICS LETTERS LA English DT Article AB Tl-based superconducting thick films deposited on large-area (11.4 cm2) Ag alloy (Consil 995) substrates have been characterized by surface resistance measurements yielding values of 4 and 14 m-OMEGA at 4 and 77 K, respectively, as measured in an 18 GHz Cu cavity; corresponding Cu values are 8 and 21 m-OMEGA. Utilizing a Nb cavity, the dependence of surface resistance on microwave power was also measured. The surface resistance begins to rise in microwave magnetic fields of 1-10 Oe and saturates in 20-60 Oe, the exact values depending on the degree of c-axis texturing of the polycrystalline films. Enhanced texturing sharpens the high-frequency transition into the superconducting state and also weakens the dependence of surface resistance on microwave magnetic field. These results are significant for high temperature superconductor applications such as microwave cavities. C1 UNIV CALIF BERKELEY,BERKELEY,CA 94720. RP COOKE, DW (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. RI Rollett, Anthony/A-4096-2012 OI Rollett, Anthony/0000-0003-4445-2191 NR 9 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 25 PY 1991 VL 58 IS 12 BP 1329 EP 1331 DI 10.1063/1.104300 PG 3 WC Physics, Applied SC Physics GA FD368 UT WOS:A1991FD36800036 ER PT J AU DESSAU, DS WELLS, BO SHEN, ZX SPICER, WE ARKO, AJ LIST, RS OLSON, CG EOM, CB MITZI, DB KAPITULNIK, A GEBALLE, TH AF DESSAU, DS WELLS, BO SHEN, ZX SPICER, WE ARKO, AJ LIST, RS OLSON, CG EOM, CB MITZI, DB KAPITULNIK, A GEBALLE, TH TI SEARCH FOR A PROXIMITY EFFECT INDUCED GAP IN GOLD HIGH-TC JUNCTIONS SO APPLIED PHYSICS LETTERS LA English DT Article ID CU-O AB We have used high-resolution photoemission spectroscopy to search for a proximity effect induced superconducting gap in gold overlayers on c-axis single crystals of Bi2Sr2CaCu2O8 and a-axis thin films of YBa2Cu3O7. These two junction types give us a representative sampling of very well characterized near-ideal interfaces (gold/c-axis Bi2Sr2CaCu2O8) and junctions in which the geometry more strongly favors the existence of the proximity effect but the interfacial quality may not be as ideal (gold/a-axis YBa2Cu3O7). In neither of these junction types did we observe any evidence for a proximity effect induced gap, and we place an upper limit of approximately 5 meV on its existence in the junctions that we have studied. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. STANFORD UNIV,DEPT APPL PHYS,STANFORD,CA 94305. RP DESSAU, DS (reprint author), STANFORD UNIV,STANFORD ELECTR LABS,STANFORD,CA 94305, USA. RI Mitzi, David/B-6260-2012; Eom, Chang-Beom/I-5567-2014 OI Mitzi, David/0000-0001-5189-4612; NR 13 TC 7 Z9 7 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 25 PY 1991 VL 58 IS 12 BP 1332 EP 1334 DI 10.1063/1.104301 PG 3 WC Physics, Applied SC Physics GA FD368 UT WOS:A1991FD36800037 ER PT J AU FAJER, J AF FAJER, J TI CREDITING WORK ON PORPHYRINS SO CHEMICAL & ENGINEERING NEWS LA English DT Letter C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. NR 5 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0009-2347 J9 CHEM ENG NEWS JI Chem. Eng. News PD MAR 25 PY 1991 VL 69 IS 12 BP 2 EP 2 PG 1 WC Chemistry, Multidisciplinary; Engineering, Chemical SC Chemistry; Engineering GA FD723 UT WOS:A1991FD72300002 ER PT J AU COOKS, RG GLISH, GL MCLUCKEY, SA KAISER, RE AF COOKS, RG GLISH, GL MCLUCKEY, SA KAISER, RE TI ION TRAP MASS-SPECTROMETRY SO CHEMICAL & ENGINEERING NEWS LA English DT Article C1 PURDUE UNIV,W LAFAYETTE,IN 47907. OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. ELI LILLY & CO,INDIANAPOLIS,IN 46285. RI McLuckey, Scott/B-2203-2009; Cooks, R/G-1051-2015 OI McLuckey, Scott/0000-0002-1648-5570; Cooks, R/0000-0002-9581-9603 NR 7 TC 99 Z9 100 U1 0 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0009-2347 J9 CHEM ENG NEWS JI Chem. Eng. News PD MAR 25 PY 1991 VL 69 IS 12 BP 26 EP & DI 10.1021/cen-v069n012.p026 PG 0 WC Chemistry, Multidisciplinary; Engineering, Chemical SC Chemistry; Engineering GA FD723 UT WOS:A1991FD72300018 ER PT J AU WOOD, MJ YAU, P IMAI, BS GOLDBERG, MW LAMBERT, SJ FOWLER, AG BALDWIN, JP GODFREY, JE MOUDRIANAKIS, EN KOCH, MHJ IBEL, K MAY, RP BRADBURY, EM AF WOOD, MJ YAU, P IMAI, BS GOLDBERG, MW LAMBERT, SJ FOWLER, AG BALDWIN, JP GODFREY, JE MOUDRIANAKIS, EN KOCH, MHJ IBEL, K MAY, RP BRADBURY, EM TI NEUTRON AND X-RAY SCATTER STUDIES OF THE HISTONE OCTAMER AND AMINO AND CARBOXYL DOMAIN TRIMMED OCTAMERS SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID NUCLEOSOME CORE PARTICLES; PROTEOLYTIC DIGESTION; CRYSTALLOGRAPHIC STRUCTURE; BIOLOGICAL MACROMOLECULES; LIMIT PEPTIDES; CHROMATIN; RESOLUTION; IDENTIFICATION; DNA; REGIONS AB The structure of the nucleosome has been under intense investigation using neutron crystallography, x-ray crystallography, and neutron solution scattering. However the dimension of the histone octamer inside the nucleosome is still a subject of controversy. The radius of gyration (R(g)) of the octamer obtained from solution neutron scattering of core particles at 63% (H2O)-H-2, 37% (H2O)-H-1 is 33 angstrom, and x-ray crystallography study of isolated histone octamer gives a R(g) of 32.5 angstrom, while the reported values using x-ray crystallography of core particles from two individual studies are 29.7 and 30.4 angstrom, respectively. We report here studies of isolated histone octamer and trypsin-limited digested octamer using both neutron solution scattering and small angle x-ray scattering. The R(g) of the octamer obtained is 33 angstrom, whereas that of the trimmed octamer is 29.8 angstrom, similar to the structure obtained from the crystals of the core particles. The N-terminal domains of the core histones in the octamer have been shown by high resolution nuclear magnetic resonance (Schroth, G. P., Yau, P., Imai, B. S., Gatewood, J. M., and Bradbury, E. M. (1990) FEBS Lett. 268, 117-120) to be mobile and flexible; it is likely that these regions are disordered and "not seen" by x-ray crystallography. C1 UNIV CALIF DAVIS,SCH MED,DEPT BIOL CHEM,DAVIS,CA 95616. JOHNS HOPKINS UNIV,DEPT BIOL,BALTIMORE,MD 21218. EUROPEAN MOLEC BIOL LAB,W-6900 HEIDELBERG,GERMANY. INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE. UNIV CALIF LOS ALAMOS SCI LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. RP WOOD, MJ (reprint author), LIVERPOOL POLYTECH,SCH INFORMAT SCI & TECHNOL,DIV PHYS,BYROM ST,LIVERPOOL L3 3AF,ENGLAND. FU NIGMS NIH HHS [GM 33495] NR 35 TC 13 Z9 13 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 MAR 25 PY 1991 VL 266 IS 9 BP 5696 EP 5702 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FD370 UT WOS:A1991FD37000053 PM 2005107 ER PT J AU BULOU, A DONOHOE, RJ SWANSON, BI AF BULOU, A DONOHOE, RJ SWANSON, BI TI PHENOMENOLOGICAL DESCRIPTION OF THE LONGITUDINAL VIBRATIONS OF THE QUASI-ONE-DIMENSIONAL SOLID PTCL - CALCULATION OF THE VALENCE DEFECT FREQUENCIES SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID LINEAR-CHAIN COMPLEXES; PLATINUM COMPLEXES; POLARONIC STATES; RAMAN-SPECTRA AB The longitudinal vibrations of the PtCl linear chain and those of various valence defects are described by a one-dimensional model in a first-nearest-neighbour interaction approximation. The analysis is performed as a function of the K2/K1 ratio (K1 and K2 representing the PtCl(IV)-Cl and Pt(II)-Cl force constants, respectively), which is shown to play an important role in the vibrational characteristics of the defects while the infrared frequencies are not strongly dependent on a particular ratio. A coherent description of the frequencies of the modes of the perfect chain and those of the polaronic defects is obtained for K2/K1 = 0.3. For this ratio the electron polaron and the electron bipolaron give rise to one Raman-active mode while at least two are predicted for the other investigated defects. The shapes of the Raman bands associated with the electron and hole polarons are explained by the chlorine isotopic effect. The vibration associated with the electron bipolaron is predicted to be at about 210 cm-1 where a broad line grows upon photolysis. An elementary calculation based upon a Born-Mayer potential for short-range interactions, adjusted from the interionic distances, leads to force constants of the same magnitude as those adjusted from the experimental frequencies. C1 UNIV MAINE,FAC SCI,CNRS 807,PHYS ETAT CONDENSE LAB,F-72017 LE MANS,FRANCE. RP BULOU, A (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV ISOTOPE & NUCL CHEM,INORGAN STRUCT CHEM GRP INC 4,LOS ALAMOS,NM 87545, USA. NR 24 TC 31 Z9 31 U1 0 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD MAR 25 PY 1991 VL 3 IS 12 BP 1709 EP 1726 DI 10.1088/0953-8984/3/12/003 PG 18 WC Physics, Condensed Matter SC Physics GA FE357 UT WOS:A1991FE35700003 ER PT J AU DAVIES, KTR WHITE, GD DAVIES, RW AF DAVIES, KTR WHITE, GD DAVIES, RW TI EVALUATION OF THE REAL PARTS OF FERMION AND BOSON PROPAGATORS USING DISPERSION-RELATIONS SO NUCLEAR PHYSICS A LA English DT Article ID COMPLEX-PLANE METHODS; HIGHLY OSCILLATORY INTEGRALS; NUCLEAR-PHYSICS; MATTER; FIELDS AB General methods are developed for efficiently evaluating principal-value integrals containing fermion and boson causal propagators. These methods are particularly applicable to integrals containing step functions which appear in the zero temperature limit of infinite nuclear matter. Examples are given for the Green functions that occur in the solution of Dyson's equations, with the inclusion of nucleon-delta-mesonic interactions. It is shown how to discretize in order to evaluate numerically the real parts of the propagators. If the real and purely imaginary self-energies of a propagator obey a dispersion relation, then the propagator itself satisfies such a relation. Finally, we discuss the two types of resonances occurring in the pion Green function. C1 NORTHWESTERN STATE UNIV LOUISIANA,NATCHITOCHES,LA 71457. GTE LABS INC,WALTHAM,MA 02254. RP DAVIES, KTR (reprint author), OAK RIDGE NATL LAB,CTR COMPUTATIONALLY INTENS PROBLEMS,OAK RIDGE,TN 37831, USA. NR 33 TC 11 Z9 11 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 MAR 25 PY 1991 VL 524 IS 4 BP 743 EP 767 DI 10.1016/0375-9474(91)90272-8 PG 25 WC Physics, Nuclear SC Physics GA FG098 UT WOS:A1991FG09800010 ER PT J AU JAENICKE, J BERTSCH, G CHANFRAY, G ESBENSEN, H SCHUCK, P AF JAENICKE, J BERTSCH, G CHANFRAY, G ESBENSEN, H SCHUCK, P TI QUASI-ELASTIC(P,P') REACTIONS IN SIMPLIFIED RESPONSE MODELS SO NUCLEAR PHYSICS A LA English DT Article ID ISOVECTOR SPIN RESPONSE; PEAK REGION; EXCITATION; NUCLEI AB Quasi-elastic proton scattering at 290, 400 and 500 MeV bombarding energy is calculated with two simplified models, the surface response model and the Thomas-Fermi model, and compared with data. Both models describe the data quite well, even though the physical assumptions are somewhat different. The agreement is in fact rather better than previously reported. C1 MICHIGAN STATE UNIV,DEPT PHYS,E LANSING,MI 48824. MICHIGAN STATE UNIV,CYCLOTRON LAB,E LANSING,MI 48824. UNIV LYON 1,F-69622 VILLEURBANNE,FRANCE. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. UNIV GRENOBLE 1,INST SCI NUCL,F-38026 ST MARTIN DHERES,FRANCE. RP JAENICKE, J (reprint author), UNIV HEIDELBERG,INST THEORET PHYS,W-6900 HEIDELBERG,GERMANY. NR 15 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 25 PY 1991 VL 524 IS 4 BP 768 EP 776 DI 10.1016/0375-9474(91)90273-9 PG 9 WC Physics, Nuclear SC Physics GA FG098 UT WOS:A1991FG09800011 ER PT J AU HALL, LJ RANDALL, L AF HALL, LJ RANDALL, L TI U(1)R SYMMETRICAL SUPERSYMMETRY SO NUCLEAR PHYSICS B LA English DT Article ID GAUGE-FERMION MASSES; BOSONS; MODELS AB An alternative class of models to the supersymmetric standard model (SSM) in which R-parity is extended to a continuous U(1)R symmetry is explored. These models have a much more predictive gaugino spectrum than SSM. We exhibit the minimal such model. We show that the recent LEP constraints on the Z branching ratio to invisible neutrals and to a light Higgs are just adequate to exclude the minimal model at the 2-sigma level. However, a class of U(1)R invariant models is not excluded by this data and retains many of the advantages of the minimal model such as gaugino mass predictions. One example of such a simple extension is presented. The cross sections for several processes which yield experimental signatures for the gauginos are calculated. We find that it will be challenging to discover the wino and zino at present colliders, but they could readily be discovered at LEP II. The main advantages of U(1)R invariant models over the SSM are that electroweak gaugino masses are predicted and there is no one-loop contribution to the neutron electric dipole moment. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV PHYS,THEORET PHYS GRP,BERKELEY,CA 94720. RP HALL, LJ (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 18 TC 117 Z9 117 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 MAR 25 PY 1991 VL 352 IS 2 BP 289 EP 308 DI 10.1016/0550-3213(91)90444-3 PG 20 WC Physics, Particles & Fields SC Physics GA FC606 UT WOS:A1991FC60600001 ER PT J AU ZHANG, TY SMITH, CL CANTOR, CR AF ZHANG, TY SMITH, CL CANTOR, CR TI SECONDARY PULSED FIELD GEL-ELECTROPHORESIS - A NEW METHOD FOR FASTER SEPARATION OF LARGER DNA-MOLECULES SO NUCLEIC ACIDS RESEARCH LA English DT Article ID ACCURATE SIZE DETERMINATION; HIGH-RESOLUTION SEPARATION; KARYOTYPE AB A novel technique, which we call secondary pulsed field gel electrophoresis (SPFG) has been developed. In SPFG, short pulses are applied in the direction of net migration of the DNA in addition to the reorienting pulses used in conventional pulsed field electrophoresis (PFG). Experimental results show that SPFG extends and improves the electrophoretic resolution of DNA for molecules from 0.5 megabase pairs to over 10 megabase pairs in size. This improved resolution is obtained with dramatically shorter run times. Thus SPFG appears to circumvent a number of the key limitations in previous PFG protocols. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,CTR HUMAN GENOME,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. OI Smith, Cassandra/0000-0002-0346-8907 NR 16 TC 21 Z9 22 U1 0 U2 0 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD MAR 25 PY 1991 VL 19 IS 6 BP 1291 EP 1296 DI 10.1093/nar/19.6.1291 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FE013 UT WOS:A1991FE01300017 PM 2030945 ER PT J AU THOENNESSEN, M AF THOENNESSEN, M TI GIANT-DIPOLE-RESONANCE WIDTHS AT HIGH EXCITATIONS IN STATISTICAL-MODEL CALCULATIONS SO PHYSICAL REVIEW LETTERS LA English DT Letter RP THOENNESSEN, M (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 6 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 MAR 25 PY 1991 VL 66 IS 12 BP 1640 EP 1640 DI 10.1103/PhysRevLett.66.1640 PG 1 WC Physics, Multidisciplinary SC Physics GA FC780 UT WOS:A1991FC78000025 ER PT J AU MORSCH, HP SPANG, W BEENE, J BERTRAND, F AF MORSCH, HP SPANG, W BEENE, J BERTRAND, F TI GIANT-DIPOLE-RESONANCE WIDTHS AT HIGH EXCITATIONS IN STATISTICAL-MODEL CALCULATIONS - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Letter C1 OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. RP MORSCH, HP (reprint author), FORSCHUNGSZENTRUM JULICH, INST KERNPHYS, W-5170 JULICH, GERMANY. NR 4 TC 4 Z9 4 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 MAR 25 PY 1991 VL 66 IS 12 BP 1641 EP 1641 DI 10.1103/PhysRevLett.66.1641 PG 1 WC Physics, Multidisciplinary SC Physics GA FC780 UT WOS:A1991FC78000026 ER PT J AU CLARO, F MAHAN, GD AF CLARO, F MAHAN, GD TI LOCAL-FIELD DISTRIBUTION IN RANDOM DIELECTRIC MEDIA - COMMENT SO PHYSICAL REVIEW LETTERS LA English DT Editorial Material C1 UNIV TENNESSEE, DEPT PHYS, KNOXVILLE, TN 37996 USA. OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. RP CLARO, F (reprint author), PONTIFICIA UNIV CATOLICA CHILE, FAC FIS, CASILLA 6177, SANTIAGO 22, CHILE. OI claro, francisco/0000-0003-2122-6992 NR 2 TC 1 Z9 1 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 25 PY 1991 VL 66 IS 12 BP 1644 EP 1644 DI 10.1103/PhysRevLett.66.1644 PG 1 WC Physics, Multidisciplinary SC Physics GA FC780 UT WOS:A1991FC78000029 ER PT J AU GRONBECHJENSEN, N LOMDAHL, PS SAMUELSEN, MR AF GRONBECHJENSEN, N LOMDAHL, PS SAMUELSEN, MR TI PHASE-LOCKING OF LONG ANNULAR JOSEPHSON-JUNCTIONS COUPLED TO AN EXTERNAL RF MAGNETIC-FIELD SO PHYSICS LETTERS A LA English DT Article ID FLUXON DYNAMICS AB Phase-locking of fluxon motion in a long annular Josephson junction coupled to an external magnetic rf field is demonstrated, by applying a simple perturbation method to the perturbed sine-Gordon system, which models the long Josephson junction. The perturbation result is compared to results of numerical solution of the perturbed sine-Gordon system and good agreement is found. C1 UNIV CALIF LOS ALAMOS SCI LAB,ADV COMP LAB,LOS ALAMOS,NM 87545. UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP GRONBECHJENSEN, N (reprint author), TECH UNIV DENMARK,PHYS LAB 1,DK-2800 LYNGBY,DENMARK. NR 13 TC 61 Z9 61 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD MAR 25 PY 1991 VL 154 IS 1-2 BP 14 EP 18 DI 10.1016/0375-9601(91)90420-D PG 5 WC Physics, Multidisciplinary SC Physics GA FF135 UT WOS:A1991FF13500004 ER PT J AU GOLSHANSHIRAZI, S ELFALLAH, MZ GUIOCHON, G AF GOLSHANSHIRAZI, S ELFALLAH, MZ GUIOCHON, G TI EFFECT OF THE INTERSECTION OF THE INDIVIDUAL ISOTHERMS IN DISPLACEMENT CHROMATOGRAPHY SO JOURNAL OF CHROMATOGRAPHY LA English DT Article ID LIQUID-CHROMATOGRAPHY; ADSORPTION; SEPARATION AB Neither the existence of an intersection between the two single-component isotherms drawn on the same graph, nor the fact that the column saturation capacity for the more retained component is lower than that of the lesser retained component, have any major consequence on the chromatographic behavior of elution bands or on the formation of the isotachic train, as long as the equilibrium isotherms of the two components are properly described by the competitive Langmuir model. Significant deviation from this model could make impossible the formation of an isotachic train in displacement chromatography, but definitive experimental proof of the existence of this effect is lacking. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 17 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD MAR 22 PY 1991 VL 541 IS 1-2 BP 195 EP 206 DI 10.1016/S0021-9673(01)95992-8 PG 12 WC Chemistry, Analytical SC Chemistry GA FE897 UT WOS:A1991FE89700013 ER PT J AU CAMPISI, J AF CAMPISI, J TI MOLECULAR-BIOLOGY OF AGING - FINCH,CE, JOHNSON,TE SO SCIENCE LA English DT Book Review RP CAMPISI, J (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAR 22 PY 1991 VL 251 IS 5000 BP 1509 EP 1510 DI 10.1126/science.251.5000.1509 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FC853 UT WOS:A1991FC85300055 PM 17779447 ER PT J AU PRICE, JM CROFTON, MW LEE, YT AF PRICE, JM CROFTON, MW LEE, YT TI VIBRATIONAL SPECTROSCOPY OF THE AMMONIATED AMMONIUM-IONS NH4+(NH3)N(N = 1-10) SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID GAS-PHASE SOLVATION; CLUSTER IONS; INTERNAL-ROTATION; INFRARED-SPECTRA; HIGH-RESOLUTION; MOLECULAR-IONS; H7O3+ .H-2; H9O4+ .H-2; PROTON; ENERGETICS AB The gas-phase vibration-internal rotation spectra of mass-selected ammoniated ammonium ions, NH4+(NH3)n (for n = 1-10), have been observed from 2600 to 4000 cm-1. The spectra show vibrational features that have been assigned to modes involving both the ion core species, NH4+, and the first shell NH3 solvent molecules. Nearly free internal rotation of the solvent molecules about their local C3 axes in the first solvation shell has been observed int he smaller clusters (n = 1-6). For the largest clusters studied (n = 7-10) the spectra converge, with little difference between clusters differing by one solvent molecule. For these clusters, the spectrum in the 3200-3500 cm-1 region is quite similar to that of liquid ammonia, and the entire region of 2600-3500 cm-1 also bears considerable resemblance to the spectra of ammonium salts dissolved in liquid ammonia under some chemical conditions. This indicates the onset of a liquidlike environment for the ion core and first shell solvent molecules in clusters as small as NH4+(NH3)8. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP LEE, YT (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720, USA. RI Lee, Yuan-Tseh/F-7914-2012 NR 58 TC 101 Z9 101 U1 3 U2 8 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 MAR 21 PY 1991 VL 95 IS 6 BP 2182 EP 2195 DI 10.1021/j100159a020 PG 14 WC Chemistry, Physical SC Chemistry GA FD112 UT WOS:A1991FD11200020 ER PT J AU LIN, S STRUVE, WS AF LIN, S STRUVE, WS TI SOLVATOCHROMISM AND TIME-RESOLVED FLUORESCENCE OF THE ANTITUMOR AGENT MITOXANTRONE AND ITS ANALOGS IN SOLUTION AND IN DNA SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID EXCITATION TRANSPORT; ABSORPTION; SPECTRA; DYES; DIHYDROCHLORIDE; ANTHRACENEDIONE; ANTHRAQUINONES; AMETANTRONE; DOXORUBICIN; DERIVATIVES AB The electronic spectroscopy and fluorescence kinetics of 1,4-dihydroxy-5,8-[2-[2-[(2-hydroxyethyl)amino]ethyl]amino]-9,10-anthracenedione (mitoxantrone) and three closely related analogues have been studied in several solvents. The small solvatochromic blue shifts of their visible charge-transfer absorption bands in protic solvents are dominated by interactions with a solvent H-bonding donor, rather than by dipole-dielectric solute-solvent electrostatics. These interactions are unrelated to the phenolic hydroxy groups or the distal N atoms on the side chains but must be localized to the carbonyl groups. The fluorescence decays of all four anthraquinones are controlled by subnanosecond nonradiative relaxation in all solvents studied. At least two decay mechanisms contribute to the observed fluorescence kinetics in solution: (a) subnanosecond internal conversion that is accelerated relative to that in 1,4-diaminoanthraquinone by the presence of the flexible 1,4-side chains in mitoxantrone and its analogues; (b) an additional decay mode that is accentuated in H-bonding solvents. A substantial normal isotope effect occurs in the fluorescence lifetimes of mitoxantrone in perdeuterated water and methanol but not in aprotic solvents. When bound to double-stranded calf thymus DNA, mitoxantrone displays a fluorescence lifetime similar to that in aprotic solvents, suggesting that H-bonding interactions with water are precluded by chromophore intercalation. DNA-bound ametantrone exhibits a lifetime longer than that in either H-bonding or aprotic solvents, indicating that immobilization of the side chains through binding of the distal N atoms to the DNA backbone may influence the decay kinetics. This technique therefore shows potential for elucidating the DNA binding modes for a large class of intercalative drugs. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 37 TC 18 Z9 19 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAR 21 PY 1991 VL 95 IS 6 BP 2251 EP 2256 DI 10.1021/j100159a029 PG 6 WC Chemistry, Physical SC Chemistry GA FD112 UT WOS:A1991FD11200029 ER PT J AU NEWTON, MD OHTA, K ZHONG, E AF NEWTON, MD OHTA, K ZHONG, E TI ANALYSIS OF SUPEREXCHANGE COUPLING IN METALLOCENE-METALLOCENIUM REDOX PAIRS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ELECTRON-TRANSFER REACTIONS; TRANSITION-METAL COMPLEXES; TRANSFER MATRIX-ELEMENTS; SELF-EXCHANGE REACTIONS; ORGANOMETALLIC MOLECULES; INTERMEDIATE NEGLECT; DISTANCE DEPENDENCE; DYNAMICAL THEORY; RADICAL-ANIONS; FERROCENE AB Using a corresponding orbital approach implemented computationally with the INDO method of Zerner et al., we have evaluated and analyzed the electron-transfer matrix elements (H(if)) for the ferrocene/ferrocenium and cobaltocene/cobaltocenium (Cp2M/(Cp2M)+) electron exchange processes. Taking due account of the relative energies of different orientations of the reactants, we obtain good agreement with estimates of H(if) inferred from experimental kinetic data, as well as a detailed interpretation of the coupling based on a fully specified effective one-electron model. This model reveals distinct electronic mechanisms for the M = Fe and M = Co cases, corresponding, respectively, to superexchange of the "electron" and "hole" type. Variationally defined effective donor and acceptor orbitals are shown to be essentially equivalent to appropriately selected canonical molecular orbitals of the Cp2M/(Cp2M)+ transition-state complex. Departures from a simple one-electron model affect the calculated H(if) values by less than 10% (i.e., the many-electron core overlap integral is greater-than-or-similar-to 0.9) even though the wave functions properly reflect the appreciable degree of electronic relaxation which is known to accompany the oxidation of the Cp2M molecules. Sigma as well as pi-type orbitals of the Cp rings are shown to play a significant role in facilitating the electronic coupling between reactants. RP NEWTON, MD (reprint author), BROOKHAVEN NATL LAB, DEPT CHEM, UPTON, NY 11973 USA. NR 66 TC 68 Z9 69 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAR 21 PY 1991 VL 95 IS 6 BP 2317 EP 2326 DI 10.1021/j100159a039 PG 10 WC Chemistry, Physical SC Chemistry GA FD112 UT WOS:A1991FD11200039 ER PT J AU BALLA, RJ CASLETON, KH AF BALLA, RJ CASLETON, KH TI KINETIC-STUDY OF THE REACTIONS OF CN WITH O2 AND CO2 FROM 292-K TO 1500-K USING HIGH-TEMPERATURE PHOTOCHEMISTRY SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID INDUCED FLUORESCENCE MEASUREMENTS; GAS-PHASE REACTIONS; VIBRATIONAL-STATES; HYDROGEN-CYANIDE; PRESSURE FLAMES; CYANOGEN; O-2; OXIDATION; MOLECULES; ENERGY AB Absolute rate constants for the reaction of CN with O2 have been measured as a function of temperature (292-1565 K) and pressure (5-80 Torr), by combining the laser-induced fluorescence detection technique with high-temperature reactor technology. CN radicals were generated by using 193-nm excimer laser photolysis of dilute C2N2/Ar mixtures. Decays of the radical concentration were monitored by using laser-induced fluorescence (LIF) near 387 nm under pseudo-first-order conditions. The reaction of CN with O2 has a negative temperature dependence and is independent of pressure. These data contain minimal curvature and are adequately fit by the expression k (+/- 2-sigma) = (1.02 +/- 0.12) x 10(-11) exp[(+220 +/- 25)/T] cm3/(molecule s). This result represents the widest continuous temperature range over which this rate constant has been measured to date. For the reaction with CO2, the CN decays are complex and are strongly dependent on the gas temperature. No detectable reaction is observed for temperatures below 900 K. For temperatures above about 1150 K, CN decays are biexponential. Because of the complexities in the behavior of the data, no reliable Arrhenius rate parameters were determined. C1 US DOE,MORGANTOWN ENERGY TECHNOL CTR,POB 880,MORGANTOWN,WV 26507. NR 38 TC 27 Z9 27 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAR 21 PY 1991 VL 95 IS 6 BP 2344 EP 2351 DI 10.1021/j100159a042 PG 8 WC Chemistry, Physical SC Chemistry GA FD112 UT WOS:A1991FD11200042 ER PT J AU SIMONS, JW MCCLEAN, RE OLDENBORG, RC AF SIMONS, JW MCCLEAN, RE OLDENBORG, RC TI ABSOLUTE NUMBER DENSITY CALIBRATION OF THE ABSORPTION BY GROUND-STATE LEAD ATOMS OF THE 283.3-NM RESONANCE LINE FROM A HIGH-INTENSITY LEAD HOLLOW-CATHODE LAMP AND THE CALCULATED EFFECT OF ARGON PRESSURES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article AB The absolute number density calibration for the absorption by ground-state lead atoms of the 283.3-nm resonance line from a high-intensity lead hollow cathode lamp (Photron superlamp) is determined and found to be the same as that of a standard hollow cathode lamp. Comparisons of the calibrations to theoretical calculations are found to be quite satisfactory. The effects of argon pressures in the absorption cell on the calibration are examined theoretically by using a simple Lorentzian broadening and shifting model. These calculations show the expected reduction in sensitivity and increasing linearity of Beer-Lambert plots with increasing argon pressure. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545. RP SIMONS, JW (reprint author), NEW MEXICO STATE UNIV,DEPT CHEM,LAS CRUCES,NM 88003, USA. NR 11 TC 2 Z9 2 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAR 21 PY 1991 VL 95 IS 6 BP 2361 EP 2364 DI 10.1021/j100159a045 PG 4 WC Chemistry, Physical SC Chemistry GA FD112 UT WOS:A1991FD11200045 ER PT J AU MALIK, IJ HRBEK, J AF MALIK, IJ HRBEK, J TI COADSORPTION-INDUCED EFFECTS AT SURFACES - COMPRESSION OF A CHEMISORBED OXYGEN LAYER BY GOLD ON RU(001) SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID THERMAL-DESORPTION; ADSORBATE INTERACTIONS; CO; ADSORPTION; SPECTROSCOPY; HYDROGEN; KINETICS; TUNGSTEN; METAL AB An experimental study of the Au/O/Ru(001) system has shown that coadsorption of gold causes dramatic changes in the parameters of oxygen desorption and, consequently, in the selectivity of surface processes. E(A), the activation energy for desorption of oxygen, is lowered, it is coverage independent, and desorption of oxygen is governed by approximately first-order kinetics. Lower E(A) prevents oxygen bulk diffusion, which otherwise competes with desorption from a pure oxygen layer, thus leading to a 2-fold increase in the amount of desorbing oxygen. A complete analysis of desorption data yields E(A) = 339 +/- 17 kj/mol, prefactor-nu = (4 +/- 2) X 10(14) s-1, and reaction order n = 0.94 +/- 0.03. Observed effects are not due to chemical interactions between Au and O, as inferred from TDS, AES, and XPS data. We propose that changes in E(A), nu, and n arise as gold 3-D islands compress oxygen 2-D islands, keeping the local oxygen coverage higher than in a saturated pure oxygen overlayer. As oxygen leaves the Ru surface (before any significant Au desorption), gold adatoms spread over the liberated Ru surface, keeping oxygen compressed and local oxygen coverage constant. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RI Hrbek, Jan/I-1020-2013 NR 28 TC 19 Z9 19 U1 3 U2 8 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 MAR 21 PY 1991 VL 95 IS 6 BP 2466 EP 2471 DI 10.1021/j100159a066 PG 6 WC Chemistry, Physical SC Chemistry GA FD112 UT WOS:A1991FD11200066 ER PT J AU CARTER, WB SCHIFERL, D LOWE, ML GONZALES, D AF CARTER, WB SCHIFERL, D LOWE, ML GONZALES, D TI NEW PHASE OF OXYGEN AT HIGH-PRESSURE AND LOW-TEMPERATURE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID X-RAY-DIFFRACTION; SOLID OXYGEN; RAMAN; SPECTROSCOPY; DIAGRAM; SYSTEM; CELL; GPA AB We have extended the phase diagram of oxygen to 34 GPa at 20 K with Raman spectroscopy on samples in diamond anvil cells. At 25.0 GPa and 20 K, a new phase, which we term zeta-O2, appears. In going from epsilon-O2 to zeta-O2, the two low-frequency intermolecular vibrational modes split abruptly by about 10 cm-1, while the vibron remains a single peak. The transition appears to be first order. RP CARTER, WB (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 23 TC 7 Z9 7 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAR 21 PY 1991 VL 95 IS 6 BP 2516 EP 2519 DI 10.1021/j100159a075 PG 4 WC Chemistry, Physical SC Chemistry GA FD112 UT WOS:A1991FD11200075 ER PT J AU ONSTOTT, EI AF ONSTOTT, EI TI THERMOCHEMISTRY OF IODINE OXIDATION OF SULFITE IN CERIUM AND PRASEODYMIUM OXIDE SULFITE SULFATE HYDRATE COMPOSITIONS TO YIELD HYDROGEN IODIDE BY HYDROLYSIS AND DISULFUR BY CONCOMITANT DISPROPORTIONATION AND COMPARISON TO THE BEHAVIOR OF LANTHANUM SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID SULFUR-DIOXIDE AB Some of the SO3(2-) in Ce2(SO3)2SO4.4H2O, mixed with a substrate of CeO2, is oxidized to SO4(2-) by I2, and HI is evolved. Concomitant with oxidation by I2 is S2 evolution by disproportionation of SO3(2-), also to yield SO4(2-) in the solid phase, plus SO2 evolution from SO3(2-) decomposition. Sequentially, HI can react with SO2 at higher temperatures to give S2, I2, and H2O. A classic Gibbs energy interpretation of concomitance is presented, and the sequential reaction is quantified by an energy-matching procedure. HI yield is influenced by temperature, reaction time, I2 pressure, H2O pressure, SO2 pressure, S2 pressure, and solid-state ion activities. Concomitant S2 is more dominant at lower temperatures where disproportionation is more respondent catalytically to I2 pressure. At higher temperatures, the concomitance ratio for HI vs S2 can be made larger by increasing H2O pressure and decreasing I2 pressure that controls the sequential reaction. Increasing the CeO2 concentration in the solid phase also increases HI. Pr, as a substitute for Ce, when mixed with a substrate of Pr2O2SO4, yields less HI at slower rates, and S2O3(2-) formation is most likely in the three elements. La, with different morphology of sulfite and the largest cation size and most hydration, mixed with a substrate of La2O2SO4 reacts most rapidly of the three elements and at lower temperatures. Long reaction times subtract from HI yields. The concomitance ratio of HI vs S2 for La compositions is more like Ce in the short term and more like Pr in the long term. C1 UNIV CALIF LOS ALAMOS,LOS ALAMOS,NM 87545. RP ONSTOTT, EI (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545, USA. NR 12 TC 4 Z9 4 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAR 21 PY 1991 VL 95 IS 6 BP 2520 EP 2525 DI 10.1021/j100159a076 PG 6 WC Chemistry, Physical SC Chemistry GA FD112 UT WOS:A1991FD11200076 ER PT J AU TRAVIS, CC BIRKNER, PD AF TRAVIS, CC BIRKNER, PD TI DRUCKERY SLOPE CONTROLLED BY MITOTIC RATE OF ENZYMATICALLY-ALTERED FOCI SO JOURNAL OF THEORETICAL BIOLOGY LA English DT Article ID TUMOR FORMATION; CARCINOGENESIS; CANCER; GROWTH; LIVER; KINETICS; MODEL; EPIDEMIOLOGY; INDUCTION RP TRAVIS, CC (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OFF RISK ANAL,POB 2008,MS 6109,BLDG 4500 S,ROOM S-204,OAK RIDGE,TN 37831, USA. NR 25 TC 3 Z9 3 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-5193 J9 J THEOR BIOL JI J. Theor. Biol. PD MAR 21 PY 1991 VL 149 IS 2 BP 217 EP 227 DI 10.1016/S0022-5193(05)80278-4 PG 11 WC Biology; Mathematical & Computational Biology SC Life Sciences & Biomedicine - Other Topics; Mathematical & Computational Biology GA FH183 UT WOS:A1991FH18300005 PM 2062093 ER PT J AU PROSPERO, JM SAVOIE, DL SALTZMAN, ES LARSEN, R AF PROSPERO, JM SAVOIE, DL SALTZMAN, ES LARSEN, R TI IMPACT OF OCEANIC SOURCES OF BIOGENIC SULFUR ON SULFATE AEROSOL CONCENTRATIONS AT MAWSON, ANTARCTICA SO NATURE LA English DT Article ID SEA-SALT SULFATE; METHANESULFONIC-ACID; SEASONAL-VARIATIONS; DIMETHYLSULFIDE; ATMOSPHERE; CONTINENT; WINDS AB Sulphate is the dominant aerosol species in the Antarctic atmosphere 1,2 and an important constituent in Antarctic snow and ice 3. Various sources have been suggested for Antarctic non-sea-salt sulphate (n.s.s. SO4(2-)): volcanic emissions, stratospheric injection, pollutants transported from the low latitudes and biogenic dimethylsulphide (DMS) from the ocean 1,2. Although the oceanic source is now believed to be especially important, there has been no strong chemical evidence directly linking oceanic DMS with the Antarctic n.s.s. SO4(2-) concentrations. Here we present extended measurements from the Antarctic for both n.s.s. SO4(2-) and methanesulphonate (MSA), an oxidation product of DMS. Both species have a very strong seasonal cycle with a maximum in the austral summer; this cycle parallels that of the oceanic biogenic sulphur producers, thereby suggesting a strong link between the Antarctic atmospheric sulphur cycle and biological processes in the Southern Ocean. C1 US DOE,ENVIRONM MEASUREMENTS LAB,NEW YORK,NY 10014. RP PROSPERO, JM (reprint author), UNIV MIAMI,ROSENSTIEL SCH MARINE & ATMOSPHER SCI,MAC,4600 RICKENBACKER CAUSEWAY,MIAMI,FL 33149, USA. OI Prospero, Joseph/0000-0003-3608-6160 NR 28 TC 101 Z9 102 U1 7 U2 12 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD MAR 21 PY 1991 VL 350 IS 6315 BP 221 EP 223 DI 10.1038/350221a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FC779 UT WOS:A1991FC77900053 ER PT J AU WOODS, AW WOHLETZ, K AF WOODS, AW WOHLETZ, K TI DIMENSIONS AND DYNAMICS OF CO-IGNIMBRITE ERUPTION COLUMNS SO NATURE LA English DT Article ID EXPLOSIVE VOLCANIC-ERUPTIONS; PYROCLASTIC FLOWS; PLINIAN ERUPTIONS; DISPERSAL; ASH; GENERATION; FALL; DUST AB Very powerful volcanic eruptions cannot always form classical Plinian eruption columns 1-4. Instead, collapsing fountains may develop above the vent and shed pyroclastic flows which spread laterally along the ground 5. The upper part of these hot, dense pyroclastic flows may become buoyant through the entrainment, heating and expansion of ambient air, coupled with the sedimentation of larger clasts suspended in the flow. The buoyant material may rise, in a co-ignimbrite eruption column, carrying massive quantities of fine dust and volatiles into the stratosphere 6,7. Here we present a model of this process, and show that the co-ignimbrite columns associated with the eruptions of Toba 8,9 75,000 years ago and Tambora 10 in 1815 may have ascended only about 32 and 23 km; the latter is comparable with the less powerful 1982 Plinian eruption column of El Chichon 11. This corroborates arguments that the mass of sulphuric acid aerosols injected into the stratosphere and not the eruptive power determines the climatic impact of an eruption 12,13. C1 UNIV CALIF SAN DIEGO, SCRIPPS INST OCEANOG, INST GEOPHYS & PLANETARY PHYS, LA JOLLA, CA 92093 USA. UNIV CALIF LOS ALAMOS SCI LAB, LOS ALAMOS, NM 87545 USA. NR 27 TC 79 Z9 80 U1 2 U2 11 PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 EI 1476-4687 J9 NATURE JI Nature PD MAR 21 PY 1991 VL 350 IS 6315 BP 225 EP 227 DI 10.1038/350225a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FC779 UT WOS:A1991FC77900055 ER PT J AU JADACH, S SKRZYPEK, M WARD, BFL AF JADACH, S SKRZYPEK, M WARD, BFL TI IS THERE A BETTER WAY OF EXPONENTIATING QED CORRECTIONS SO PHYSICS LETTERS B LA English DT Article ID RADIATIVE-CORRECTIONS; CROSS-SECTION; E+E ANNIHILATION; LEP ENERGIES AB There is always a certain freedom in the practical prescription for the QED exponentiation. Restricting ourselves to the leading logarithmic approximation we are able to compare the result of the fixed (second) order exponentiated result with the exact (infinite order) solution calculated numerically with the help of the Monte Carlo technique. Taking three types of the second order exponentiation recipes we conclude that the method related closely to the Yennie-Frautsch-Suura (YFS) classical work is more convergent that the other ones used by many authors. C1 UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. CERN,DIV THEORY,CH-1211 GENEVA 23,SWITZERLAND. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. RP JADACH, S (reprint author), JAGIELLONIAN UNIV,INST PHYS,UL REYMONTA 4,PL-30059 KRAKOW,POLAND. NR 30 TC 48 Z9 49 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 MAR 21 PY 1991 VL 257 IS 1-2 BP 173 EP 178 DI 10.1016/0370-2693(91)90877-S PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FD847 UT WOS:A1991FD84700031 ER PT J AU JADACH, S WARD, BFL WAS, Z AF JADACH, S WARD, BFL WAS, Z TI COMPLETE STANDARD MODEL PREDICTIONS FOR THE MUON FORWARD BACKWARD ASYMMETRY AT LEP SO PHYSICS LETTERS B LA English DT Article ID RADIATIVE-CORRECTIONS; POLARIZATION AB We discuss the prediction of the standard model for the forward-backward asymmetry of muons at LEP. Our aim is to obtain as realistic predictions of the standard model as possible. We discuss the asymmetry as a function of center of mass energy and of the Z, t-quark and Higgs masses. We include into our analysis all relevant effects, that is electroweak corrections, QED corrections and QCD/hadronic corrections as well as effects of the typical experimental cuts. In our analysis we use the combined analytical and Monte Carlo calculation. C1 UNIV TENNESSEE,DEPT METEOROL,KNOXVILLE,TN 37996. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. INST NUCL PHYS,PL-30055 KRAKOW,POLAND. CERN,PPE,CH-1211 GENEVA 23,SWITZERLAND. RP JADACH, S (reprint author), CERN,DIV THEORY,CH-1211 GENEVA 23,SWITZERLAND. NR 32 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 MAR 21 PY 1991 VL 257 IS 1-2 BP 213 EP 218 DI 10.1016/0370-2693(91)90884-S PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FD847 UT WOS:A1991FD84700038 ER PT J AU LANDRY, MJ RUPERT, JW MITTAS, A AF LANDRY, MJ RUPERT, JW MITTAS, A TI POWER-BY-LIGHT SYSTEMS AND THEIR COMPONENTS - AN EVALUATION SO APPLIED OPTICS LA English DT Article ID SEMICONDUCTOR-LASER; ARRAY; CW AB This paper describes the testing of small sized systems and their components that use power-by-light (PBL) to transfer energy across a barrier. The PBL systems used improved high power laser diodes, large numerical aperture fibers, improved high efficient, high power solar cells, and low input-to-high output voltage dc-dc converters. The laser diodes emitted up to 3.6 W continuously by converting approximately 40% of its electrical power to light power into fibers that transmitted up to 92% of its incident energy flux. The specially fabricated solar cell converted 46% of its incident light power to electrical power at a fill factor of 89%. The most efficient 100- and 220-mJ PBL systems charged capacitors in 0.64 and 0.8 s for a total system efficiency of 3.4 and 5.5%. Expected improvements could yield system efficiencies of 12%. C1 SANDIA NATL LABS,DIV 2364,ALBUQUERQUE,NM 87185. RP LANDRY, MJ (reprint author), SCOT INC,2525 CURTISS ST,DOWNERS GROVE,IL 60515, USA. NR 22 TC 17 Z9 17 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD MAR 20 PY 1991 VL 30 IS 9 BP 1052 EP 1061 PG 10 WC Optics SC Optics GA FD016 UT WOS:A1991FD01600022 PM 20582105 ER PT J AU HECKMAN, TM LEHNERT, MD VANBREUGEL, W MILEY, GK AF HECKMAN, TM LEHNERT, MD VANBREUGEL, W MILEY, GK TI SPATIALLY RESOLVED OPTICAL-IMAGES OF HIGH-REDSHIFT QUASI-STELLAR OBJECTS SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES-INTERSTELLAR MATTER; QUASARS ID EMISSION-LINE REGIONS; EXTRAGALACTIC RADIO-SOURCES; COOLING FLOWS; EMITTING GAS; X-RAY; GALAXIES; JETS; SPECTROSCOPY; QSOS; EVOLUTION AB We present and discuss the results of a program of deep optical imaging of 19 high-redshift (z greater-than-or-equal-to 2) radio-loud QSOs. These data represent the first large body of nonradio detections of spatially resolved structure surrounding high-redshift QSOs. In 15 of 18 cases, the Ly-alpha emission is spatially resolved, with a typical size of 100 kpc (for H0 = 75 km s-1 Mpc-1; q0 = 0). The luminosity of the resolved Ly-alpha is almost-equal-to 10(44) ergs s-1 (almost-equal-to 10% of the total Ly-alpha luminosity). The nebulae are usually asymmetric and/or elongated with a morphological axis that aligns with the radio source axis to better than almost-equal-to 30-degrees. These properties are quite similar to those of the Ly-alpha nebulae associated with high-z radio galaxies. The brighter side of the nebula is generally on the same side as the brighter radio emission and/or one-sided, jetlike radio structure. There is no strong correlation between the Ly-alpha isophotal and radio sizes (the Ly-alpha nebulae range from several times larger than the radio source to several times smaller). None of the properties of the nebulae correlate with the presence or strength of C IV "associated" absorption (Z(abs) almost-equal-to Z(em)). It is likely that the nebulae are the interstellar or circumgalactic medium of young or even protogalaxies being photoionized by QSO radiation that escapes anisotropically along the radio axis. Photoionization equilibrium arguments imply that the Ly-alpha emission arises in small (parsec-scale) dense (10(2)-10(3) cm-3) clouds. If the clouds are not confined, their short lifetime to photoevaporation requires a total reservoir of a few times 10(11) M. in dense gas. If the clouds are confined by a hot, diffuse intercloud medium at the Compton or Virial temperature (almost-equal-to 10(7) K), the mass of this ICM is almost-equal-to 10(12) M.. Cloud confinement by a "cocoon" inflated by the radio source or by a thermal QSO wind also entail a substantial total gas mass (> 10(11) M.). The interaction of the radio jet with the ambient gaseous medium may enhance the (radio) visibility of the jet plasma, and lead directly to the small sizes and distorted and asymmetric structures of the radio sources. Indeed, the gas pressures inferred for the Ly-alpha nebulae are far larger than those inferred around low-z radio galaxies and radio-loud QSOs. For at least six and probably 10 of the QSOs, the UV continuum is also spatially resolved, with diameters of 40-80 kpc. The spatially resolved material is typically almost-equal-to 10% as bright as the QSO, with an average UV luminosity (lambda-P-lambda at almost-equal-to 1200 angstrom) of almost-equal-to 2 x 10(45) ergs s-1 (comparable to the UV luminosities of high-z radio galaxies). The morphological axes of the spatially extended continuum structures do not generally align with either the radio or Ly-alpha morphological axes (contrary to the properties of high-z radio galaxies). This UV "fuzz" may be starlight from the QSO host galaxy, scattered QSO light, or even a foreground galaxy acting as a gravitational lens. By analogy to high-z radio galaxies, the first possibility is most likely, implying typical star-formation rates of several hundred M. per year. If sustained for a galaxy dynamical time (several times 10(8) yr) this would result in the formation of a galaxy's worth of stars. High-redshift radio-loud QSOs may be associated with the formation of some galaxies. Finally, we note that several QSOs have possible close (within 100 kpc of the QSO) companion galaxies with Ly-alpha emission. These require spectroscopic confirmation. C1 JOHNS HOPKINS UNIV, ROWLAND DEPT PHYS & ASTRON, BALTIMORE, MD 21218 USA. STERREWACHT LEIDEN, 2300 RA LEIDEN, NETHERLANDS. SPACE TELESCOPE SCI INST, BALTIMORE, MD 21218 USA. UNIV MARYLAND, ASTRON PROGRAM, COLLEGE PK, MD 20742 USA. UNIV CALIF LAWRENCE LIVERMORE NATL LAB, INST GEOPHYS & PLANETARY PHYS, LIVERMORE, CA 94550 USA. NR 83 TC 117 Z9 117 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD MAR 20 PY 1991 VL 370 IS 1 BP 78 EP 101 DI 10.1086/169794 PN 1 PG 24 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA EZ603 UT WOS:A1991EZ60300006 ER PT J AU SHORE, SN SONNEBORN, G STARRFIELD, SG HAMUY, M WILLIAMS, RE CASSATELLA, A DRECHSEL, H AF SHORE, SN SONNEBORN, G STARRFIELD, SG HAMUY, M WILLIAMS, RE CASSATELLA, A DRECHSEL, H TI MULTIWAVELENGTH OBSERVATIONS OF NOVA LMC-1990 NUMBER-2 - THE 1ST EXTRAGALACTIC RECURRENT NOVA SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES-MAGELLANIC CLOUDS; STARS-NOVAE; ULTRAVIOLET-SPECTRA ID U-SCORPII; OUTBURST AB We present IUE and optical observations of Nova LMC 1990 Number 2, the first recurrent nova to be observed outside the Milky Way. The earlier optical outburst of the nova was observed in 1968, when it reached a maximum of about V = 10.9. IUE spectra were obtained between 1990 February 16 and March 26, with 8 hr resolution during the first day of observations. The ultraviolet observations reported here caught the nova at UV maximum; no P Cygni profiles developed on the resonance lines, suggesting that very little mass was ejected and the outburst was not spherical. The integrated UV luminosity at UV maximum was 2.9 x 10(38) ergs s-1. Thus the luminosity exceeded the Eddington limit for a one solar mass white dwarf [assuming E(B-V) = 0.15 and a distance of 55 kpc to the LMC]. This is the first time that the luminosity of a recurrent nova has been directly obtained. C1 ASSOCIATED UNIV RES ASTRON INC,CERRO TOLOLO INTER AMER OBSERV,LA SERENA,CHILE. NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771. ARIZONA STATE UNIV,DEPT PHYS & ASTRON,TEMPE,AZ 85287. UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. CNR,IST ASTROFIS SPAZIALE,FRASCATI,ITALY. UNIV ERLANGEN NURNBERG,DR REMEIS STERNWARTE,INST ASTRON,W-8520 ERLANGEN,GERMANY. EUROPEAN SPACE AGCY,VILSPA,IUE OBSERV,MADRID,SPAIN. RP SHORE, SN (reprint author), NASA,GODDARD SPACE FLIGHT CTR,COMP SCI CORP,GODDARD RESOLUT SPECTROGRAPH TEAM,CODE 681,GREENBELT,MD 20771, USA. RI Drechsel, Horst/D-9696-2013; Hamuy, Mario/G-7541-2016 NR 16 TC 26 Z9 26 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAR 20 PY 1991 VL 370 IS 1 BP 193 EP 197 DI 10.1086/169804 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA EZ603 UT WOS:A1991EZ60300016 ER PT J AU DERMER, CD HURLEY, KC HARTMANN, DH AF DERMER, CD HURLEY, KC HARTMANN, DH TI X-RAY ECHOES FROM GAMMA-RAY BURSTS SO ASTROPHYSICAL JOURNAL LA English DT Article DE GAMMA-RAYS-BURSTS; X-RAYS-BINARIES ID COLD ELECTRONS; NEUTRON STARS; ABSORPTION; RADIATION; FEATURES; EMISSION; SPECTRA; GINGA AB The identification of an echo of reflected radiation in time histories of gamma-ray burst spectra can provide important information about the existence of binary companions or accretion disks in gamma-ray burst systems. Because of the nature of Compton scattering, the spectrum of the echo will be attenuated at gamma-ray energies compared with the spectrum of the primary burst emission. We describe the expected temporal and spectral signatures of the echo, our search for such echoes, and discuss implications for gamma-ray burst models. C1 BERKELEY SPACE SCI LAB, BERKELEY, CA USA. UNIV CALIF LAWRENCE LIVERMORE NATL LAB, INST GEOPHYS & PLANETARY PHYS, LIVERMORE, CA 94550 USA. NR 35 TC 7 Z9 7 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAR 20 PY 1991 VL 370 IS 1 BP 341 EP 344 DI 10.1086/169820 PN 1 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA EZ603 UT WOS:A1991EZ60300032 ER PT J AU GORSKI, KM AF GORSKI, KM TI WILL COBE CHALLENGE THE INFLATIONARY PARADIGM - COSMIC MICROWAVE BACKGROUND ANISOTROPIES VERSUS LARGE-SCALE STREAMING MOTIONS REVISITED SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC BACKGROUND RADIATION; COSMOLOGY AB The relation between cosmic microwave background (CMB) anisotropies and large-scale galaxy streaming motions is examined within the framework of inflationary cosmology. The minimal Sachs & Wolfe CMB anisotropies at large angular scales in the models with initial Harrison-Zel'dovich spectrum of inhomogeneity normalized to the local large-scale bulk flow, which are independent of the Hubble constant and specific nature of dark matter, are found to be within the anticipated ultimate sensitivity limits of COBE's DMR experiment. For example, the most likely value of the quadrupole coefficient is predicted to be a2 greater-than-or-equal-to 7 x 10(-6), where equality applies to the limiting minimal model. If (1) COBE's DMR instruments perform well throughout the 2 year period, (2) the anisotropy data are not marred by the systematic errors, (3) the large-scale motions retain their present observational status, (4) there is no statistical conspiracy in a sense of the measured bulk flow being of untypically high and the large-scale anisotropy of untypically low amplitudes, and (5) the low-order multipoles in the all-sky primordial fireball temperature map are not detected, the inflationary paradigm will have to be questioned. RP GORSKI, KM (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,T-6,MS B-288,LOS ALAMOS,NM 87545, USA. NR 19 TC 27 Z9 27 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 MAR 20 PY 1991 VL 370 IS 1 BP L5 EP L9 DI 10.1086/185964 PN 2 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA EZ604 UT WOS:A1991EZ60400002 ER PT J AU ALBINATI, A BULLOCK, RM RAPPOLI, BJ KOETZLE, TF AF ALBINATI, A BULLOCK, RM RAPPOLI, BJ KOETZLE, TF TI X-RAY-DIFFRACTION STUDY OF PENTACARBONYL(MU-HYDRIDO)(NONACARBONYLDIMANGANESE)RHENIUM, HMN2RE(CO)14 SO INORGANIC CHEMISTRY LA English DT Note ID HETEROBIMETALLIC COMPLEXES; CRYSTAL-STRUCTURE; HYDRIDE COMPLEXES; METAL-CARBONYL; DECACARBONYL; LIGANDS; BONDS; GOLD; MN C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RP ALBINATI, A (reprint author), UNIV MILAN,INST PHARMACEUT CHEM,I-20131 MILAN,ITALY. RI Bullock, R. Morris/L-6802-2016; Albinati, Alberto/I-1262-2015 OI Bullock, R. Morris/0000-0001-6306-4851; Albinati, Alberto/0000-0002-8779-3327 NR 22 TC 11 Z9 11 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD MAR 20 PY 1991 VL 30 IS 6 BP 1414 EP 1417 DI 10.1021/ic00006a048 PG 4 WC Chemistry, Inorganic & Nuclear SC Chemistry GA FD041 UT WOS:A1991FD04100048 ER PT J AU CHOI, MG ANGELICI, RJ AF CHOI, MG ANGELICI, RJ TI KINETIC-STUDIES OF PPH3 SUBSTITUTION OF SULFUR-COORDINATED THIOPHENES IN CP'(CO)2RE(TH) - A MODEL FOR THIOPHENE ADSORPTION ONTO HYDRODESULFURIZATION CATALYSTS SO INORGANIC CHEMISTRY LA English DT Note ID COBALT-MOLYBDENUM CATALYST; COMPLEXES; MECHANISM; (ETA-THIOPHENE)RU(ETA-C5H5)+; CHEMISORPTION; REACTIVITY; EXCHANGE; IRON C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 27 TC 29 Z9 29 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD MAR 20 PY 1991 VL 30 IS 6 BP 1417 EP 1419 DI 10.1021/ic00006a049 PG 3 WC Chemistry, Inorganic & Nuclear SC Chemistry GA FD041 UT WOS:A1991FD04100049 ER PT J AU WING, S SHY, CM WOOD, JL WOLF, S CRAGLE, DL FROME, EL AF WING, S SHY, CM WOOD, JL WOLF, S CRAGLE, DL FROME, EL TI MORTALITY AMONG WORKERS AT OAK RIDGE NATIONAL LABORATORY - EVIDENCE OF RADIATION EFFECTS IN FOLLOW-UP THROUGH 1984 SO JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION LA English DT Article ID RATES; COHORT; MISCLASSIFICATION; SELECTION; SURVIVAL; EXPOSURE; PLANT AB White men hired at the Oak Ridge (Tenn) National Laboratory between 1943 and 1972 were followed up for vital status through 1984 (N = 8318, 1524 deaths). Relatively low mortality compared with that in US white men was observed for most causes of death, but leukemia mortality was elevated in the total cohort (63% higher, 28 deaths) and in workers who had at some time been monitored for internal radionuclide contamination (123% higher, 16 deaths). Median cumulative dose of external penetrating radiation was 1.4 mSv; 638 workers had cumulative doses above 50 mSv (5 rem). After accounting for age, birth cohort, a measure of socioeconomic status, and active worker status, external radiation with a 20-year exposure lag was related to all causes of death (2.68% increase per 10 mSv) primarily due to an association with cancer mortality (4.94% per 10 mSv). Studies of this population through 1977 did not find radiation-cancer mortality associations, and identical analyses using the shorter follow-up showed that associations with radiation did not appear until after 1977. The radiation-cancer dose response is 10 times higher than estimates from the follow-up of survivors of the bombings of Hiroshima and Nagasaki, Japan, but similar to one previous occupational study. Dose-response estimates are subject to uncertainties due to potential problems, including measurement of radiation doses and cancer outcomes. Longer-term follow-up of this and other populations with good measurement of protracted low-level exposures will be critical to evaluating the generalizability of the results reported herein. C1 OAK RIDGE TENN ASSOCIATED UNIV,CTR EPIDEMIOL RES,OAK RIDGE,TN. OAK RIDGE NATL LAB,MATH SCI SECT,OAK RIDGE,TN 37830. RP WING, S (reprint author), UNIV N CAROLINA,SCH PUBL HLTH,DEPT EPIDEMIOL,CB 7400,CHAPEL HILL,NC 27599, USA. NR 29 TC 148 Z9 150 U1 0 U2 1 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0098-7484 J9 JAMA-J AM MED ASSOC JI JAMA-J. Am. Med. Assoc. PD MAR 20 PY 1991 VL 265 IS 11 BP 1397 EP 1402 DI 10.1001/jama.265.11.1397 PG 6 WC Medicine, General & Internal SC General & Internal Medicine GA FB550 UT WOS:A1991FB55000019 PM 1999879 ER PT J AU BANISTER, JR HEREFORD, WV AF BANISTER, JR HEREFORD, WV TI OBSERVED HIGH-ALTITUDE PRESSURE WAVES FROM AN UNDERGROUND AND A SURFACE EXPLOSION SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID ACOUSTIC-WAVE; IONOSPHERE AB Measurements of high-altitude pressure waves from underground and surface explosions are of interest, as these waves can affect ionospheric electron density and be a source of infrasonic signals. Canisters, equipped with parachutes, were dropped from aircraft to determine time histories of pressure waves radiated by the ground surface above an underground nuclear explosion and a surface chemical explosion. These canisters contained transducers to document pressure and acceleration histories as well as a transmitter to relay information to ground receiver stations. We found observed pressure histories from the underground explosion to be consistent with histories calculated from surface ground motion records. The peak blast wave overpressures from the chemical explosion agreed with predicted scaled values. Observed time histories, however, had shorter positive phase duration than predicted with scaling. RP BANISTER, JR (reprint author), SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. NR 30 TC 15 Z9 15 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD MAR 20 PY 1991 VL 96 IS D3 BP 5185 EP 5193 DI 10.1029/90JD02640 PG 9 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA FD794 UT WOS:A1991FD79400018 ER PT J AU BOHREN, CF SINGHAM, SB AF BOHREN, CF SINGHAM, SB TI BACKSCATTERING BY NONSPHERICAL PARTICLES - A REVIEW OF METHODS AND SUGGESTED NEW APPROACHES SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID ANGULAR SCATTERING PATTERNS; COUPLED-DIPOLE METHOD; LIGHT-SCATTERING; ARBITRARY PARTICLE; TSCHEBYSCHEFF PARTICLES; INHOMOGENEOUS PARTICLES; APPROXIMATION; AEROSOLS; GRAINS; MATRIX AB Scattering of electromagnetic radiation near the-backward direction is more sensitive to particle shape than scattering near the forward direction. Mie theory is therefore of dubious applicability to predicting backscattering by atmospheric particles known to be irregular or to inverting measurements on such particles. An irregular particle is one with an uncertain shape. In the face of uncertainty one must adopt a statistical approach in which scattering properties of ensembles are determined. To obtain ensemble averages, a basis is needed for averaging over a set of electromagnetic microstates. Ensemble averages based on the Rayleigh theory for small ellipsoids and on the T matrix method for spheroids agree better with measurements than Mie theory does. The coupled-dipole method also provides a basis for ensemble averaging. This method also leads to a simple physical interpretation of why backscattering is so sensitive to particle shape and can be used to calculate scattering by one- and two-dimensional analogs to three-dimensional irregular particles. C1 UNIV CALIF LOS ALAMOS SCI LAB, DIV LIFE SCI, LOS ALAMOS, NM 87544 USA. RP BOHREN, CF (reprint author), PENN STATE UNIV, DEPT METEOROL, UNIVERSITY PK, PA 16802 USA. NR 49 TC 61 Z9 61 U1 0 U2 13 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD MAR 20 PY 1991 VL 96 IS D3 BP 5269 EP 5277 DI 10.1029/90JD01138 PG 9 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA FD794 UT WOS:A1991FD79400025 ER PT J AU JOHNSON, SA KUMAR, R AF JOHNSON, SA KUMAR, R TI COMPOSITION AND SPECTRAL CHARACTERISTICS OF AMBIENT AEROSOL AT MAUNA-LOA OBSERVATORY SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID CO2-LASER WAVELENGTHS; SULFATE AEROSOL; PARTICLE-SIZE; BACKSCATTER; ACID; PERFORMANCE; ATMOSPHERE AB Ambient aerosol particles were sampled continuously with a time resolution of approximately 4 hours for a period of 8 days at the Mauna Loa Observatory, Hawaii, in August 1986. The samples were analyzed on-site for their chemical composition by attenuated total internal reflection infrared spectroscopy. The infrared absorption spectra of the samples also provided data on aerosol light absorbance characteristics at 9.1 and 10.6-mu-m - wavelengths of interest in determining aerosol backscatter coefficients for CO2 lidars. The chemical species in the ambient aerosol varied considerably during this 8-day period. The aerosol was acidic [(NH4)3H(SO4)2, NH4HSO4, or H2SO4] rather than neutral [(NH4)2SO4] for a major fraction of the sampling time. The samples generally showed much higher absorbance at 9.1-mu-m than at 10.6-mu-m. Changes in the chemical composition between (NH4)2SO4 and the more acidic forms were accompanied by substantial changes in the sample's absorbance at 9.1-mu-m but lesser changes in the absorbance at 10.6-mu-m. These variations could have a profound effect on backscatter coefficients of atmospheric aerosol particles at CO2 wavelengths. RP JOHNSON, SA (reprint author), ARGONNE NATL LAB, DIV CHEM TECHNOL, 9700 S CASS AVE, ARGONNE, IL 60439 USA. NR 22 TC 3 Z9 3 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD MAR 20 PY 1991 VL 96 IS D3 BP 5379 EP 5386 DI 10.1029/89JD03560 PG 8 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA FD794 UT WOS:A1991FD79400036 ER PT J AU KUMRU, M AF KUMRU, M TI A COMPARISON OF THE OPTICAL, IR, ELECTRON-SPIN-RESONANCE AND CONDUCTIVITY PROPERTIES OF A-GE1-XCX-H WITH A-GE-H AND A-GE THIN-FILMS PREPARED BY RF-SPUTTERING SO THIN SOLID FILMS LA English DT Article ID AMORPHOUS-SILICON; GLOW-DISCHARGE; INFRARED-ABSORPTION; GERMANIUM; HYDROGEN AB Amorphous germanium (a-Ge), hydrogenated amorphous germanium (a-Ge:H) and hydrogenated amorphous germanium carbide (a-Ge1-xC(x):H) films were prepared by r.f. sputtering at various r.f. power levels and ratios of gases. The Tauc-determined optical gaps of the films calculated are in the range 0.55-0.66 eV for a-Ge, 0.62-1.19 eV for a-Ge:H and higher than 0.95 eV for a-Ge1-xC(x):H. The slopes of the absorption curves of the films yield the usually observed values of the Urbach coefficients E0, namely 115 meV less-than-or-equal-to E0 less-than-or-equal-to 450 meV. The concentrations of Ge-H and C-H bands were determined from Fourier transform IR spectra. Auger spectroscopy was used to determine the C:Ge ratio of some samples. The electron spin resonance defect spin densities range from 2.8 x 10(17) to 7.84 x 10(20) spins cm-3. Dark conductivity and photoconductivity of the films were measured with an intensity of 50 mW cm-2 at the sample surface. These films are unsuitable for single-cell photovoltaic devices because their optical gaps are less than 1.2 eV. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. NR 24 TC 31 Z9 33 U1 0 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 MAR 20 PY 1991 VL 198 IS 1-2 BP 75 EP 84 DI 10.1016/0040-6090(91)90326-S PG 10 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA FE543 UT WOS:A1991FE54300009 ER PT J AU BLAIR, P GODFREY, VL WILKINSON, JE AF BLAIR, P GODFREY, VL WILKINSON, JE TI DOES THE SCURFY MUTATION CAUSE A DEFECT IN THE THYMIC MICROENVIRONMENT SO FASEB JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. UNIV TENNESSEE,KNOXVILLE,TN 37901. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 19 PY 1991 VL 5 IS 6 BP A1701 EP A1701 PN 3 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FE557 UT WOS:A1991FE55701421 ER PT J AU BRENNAN, P KOKJOHN, K TRIANO, J FRITZ, T WARDRIP, C HONDRAS, M AF BRENNAN, P KOKJOHN, K TRIANO, J FRITZ, T WARDRIP, C HONDRAS, M TI IMMUNOLOGICAL CORRELATES OF SPINAL HYPOMOBILITY IN BEAGLES SO FASEB JOURNAL LA English DT Meeting Abstract C1 NATL COLL CHIROPRACTIC,LOMBARD,IL 60148. ARGONNE NATL LAB,ARGONNE,IL 60439. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 19 PY 1991 VL 5 IS 6 BP A1639 EP A1639 PN 3 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FE557 UT WOS:A1991FE55701065 ER PT J AU GODFREY, VL COLLIER, J WILKINSON, JE AF GODFREY, VL COLLIER, J WILKINSON, JE TI THYMUS TRANSPLANT TRANSMISSION OF SCURFY MOUSE LYMPHORETICULAR DISEASE IS H-2 RESTRICTED SO FASEB JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. UNIV TENNESSEE,KNOXVILLE,TN 37901. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 19 PY 1991 VL 5 IS 6 BP A1701 EP A1701 PN 3 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FE557 UT WOS:A1991FE55701418 ER PT J AU MEZNARICH, HK BRABY, LA SIKOV, MR AF MEZNARICH, HK BRABY, LA SIKOV, MR TI ALTERED FIBRONECTIN LEVELS IN IRRADIATED MOUSE BLASTOCYSTS SO FASEB JOURNAL LA English DT Meeting Abstract C1 PACIFIC NW LAB, DEPT BIOL & CHEM, RICHLAND, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 19 PY 1991 VL 5 IS 6 BP A1617 EP A1617 PN 3 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FE557 UT WOS:A1991FE55700935 ER PT J AU WOLOSCHAK, GE JEN, MC LIBERTIN, CR AF WOLOSCHAK, GE JEN, MC LIBERTIN, CR TI INCREASED EXPRESSION OF TUMOR-NECROSIS-FACTOR IN IMMUNODEFICIENT WASTED MICE SO FASEB JOURNAL LA English DT Meeting Abstract C1 ARGONNE NATL LAB,DIV BIOL & MED RES,ARGONNE,IL 60439. LOYOLA UNIV,MAYWOOD,IL 60153. RI Woloschak, Gayle/A-3799-2017 OI Woloschak, Gayle/0000-0001-9209-8954 NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 19 PY 1991 VL 5 IS 6 BP A1672 EP A1672 PN 3 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FE557 UT WOS:A1991FE55701252 ER 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 SO APPLIED PHYSICS LETTERS LA English DT Article ID CO/PT-LAYERED STRUCTURES; ANISOTROPY; PD/CO AB An elementary formula is derived for the magneto-optic Kerr effect from model superlattices. An exact result is obtained for the case of equal refractive indices for the two constituents of the superlattice. Co/Pt is used as an example of such superlattices for wavelengths in the vicinity of 2 eV. First-order corrections in the difference of the refractive indices are derived which are suitable for treating a variety of materials. C1 TECHNION ISRAEL INST TECHNOL,DEPT PHYS,HAIFA,ISRAEL. RP ZAK, J (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013 NR 15 TC 13 Z9 13 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 18 PY 1991 VL 58 IS 11 BP 1214 EP 1216 DI 10.1063/1.104368 PG 3 WC Physics, Applied SC Physics GA FD848 UT WOS:A1991FD84800033 ER PT J AU TAKENAKA, T PETRIC, A SABOUNGI, ML AF TAKENAKA, T PETRIC, A SABOUNGI, ML TI THERMODYNAMIC PROPERTIES AND PHASE-EQUILIBRIA OF THE POTASSIUM INDIUM SYSTEM BY ELECTROMOTIVE-FORCE MEASUREMENTS SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID ALLOYS; LEAD; BEHAVIOR AB The potassium-indium system has been studied using galvanic cells with potassium beta alumina as the electrolyte. The thermodynamic properties of the liquid solution have been determined between 0 and 52 at.% potassium. There is some evidence for a very weak liquid compound near 35 at.% K, but not at 50 at.% K. Changes are proposed for the potassium-indium phase diagram, including the liquidus temperature and the existence of new compounds. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RI Saboungi, Marie-Louise/C-5920-2013 OI Saboungi, Marie-Louise/0000-0002-0607-4815 NR 12 TC 6 Z9 6 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD MAR 18 PY 1991 VL 3 IS 11 BP 1603 EP 1612 DI 10.1088/0953-8984/3/11/018 PG 10 WC Physics, Condensed Matter SC Physics GA FD306 UT WOS:A1991FD30600018 ER PT J AU BARTON, TJ IJADIMAGHSOODI, S PANG, Y AF BARTON, TJ IJADIMAGHSOODI, S PANG, Y TI THERMAL AND CATALYTIC POLYMERIZATION OF DIETHYNYLDIPHENYLSILANE SO MACROMOLECULES LA English DT Article AB The thermal polymerization of diethynyldiphenylsilane, reported in 1968 to afford the poly-(silylenebutadiyne), -[Ph2Si-C = C-C = C]n-, has been reinvestigated and found not to produce a polymer containing acetylenic units in the chain. Vastly improved properties are achieved when the polymerization is catalytically induced with MoCl5 or WCl6. These polymers are electrically conducting (10(-3) S/cm) with I2 doping and form good-quality solvent-cast films. RP BARTON, TJ (reprint author), US DOE,AMES LAB,DEPT CHEM,AMES,IA 50011, USA. NR 9 TC 49 Z9 51 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAR 18 PY 1991 VL 24 IS 6 BP 1257 EP 1260 DI 10.1021/ma00006a007 PG 4 WC Polymer Science SC Polymer Science GA FD855 UT WOS:A1991FD85500007 ER PT J AU DAWSON, S VALENCIA, G AF DAWSON, S VALENCIA, G TI CHIRAL LAGRANGIANS AND WW SCATTERING SO NUCLEAR PHYSICS B LA English DT Article ID STRONGLY INTERACTING WS; HIGGS-BOSON MASS; PERTURBATION-THEORY; WEAK-INTERACTIONS; SYMMETRY-BREAKING; STANDARD MODEL; PHYSICS; SECTOR; ZS AB Recently, it has been proposed that the scattering of strongly interacting longitudinal gauge bosons can be studied using chiral perturbation theory. By fitting the energy dependence of the scattering amplitudes in the energy region 0.5 TeV < square root of s < 1.2 TeV one is sensitive to the nature of electroweak symmetry breaking. This information will be particularly useful if no low-lying resonances are found. We study the feasibility of this approach in pp colliders. We also comment on the qqBAR --> W(L)+W(L)- process. RP DAWSON, S (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 42 TC 42 Z9 42 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 MAR 18 PY 1991 VL 352 IS 1 BP 27 EP 44 DI 10.1016/0550-3213(91)90127-J PG 18 WC Physics, Particles & Fields SC Physics GA FA700 UT WOS:A1991FA70000002 ER PT J AU MILLER, GS EPSTEIN, RI NOLTA, JP FENIMORE, EE AF MILLER, GS EPSTEIN, RI NOLTA, JP FENIMORE, EE TI CYCLOTRON LINES IN GAMMA-RAY BURST SPECTRA - ABSORPTION IN A RADIATION-DRIVEN WIND SO PHYSICAL REVIEW LETTERS LA English DT Article ID FEATURES AB Previous models of cyclotron-line features in the spectra of cosmic gamma-ray bursts have assumed that the lines form in a thin, static atmosphere. Here we show that the observed absorption lines may in fact form in a radiation-driven plasma wind expelled at relativistic velocities from the surface of a neutron star. RP MILLER, GS (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,MAIL STOP D436,LOS ALAMOS,NM 87545, USA. NR 10 TC 15 Z9 15 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 MAR 18 PY 1991 VL 66 IS 11 BP 1395 EP 1397 DI 10.1103/PhysRevLett.66.1395 PG 3 WC Physics, Multidisciplinary SC Physics GA FB937 UT WOS:A1991FB93700004 ER PT J AU BERSHADY, MA RESSELL, MT TURNER, MS AF BERSHADY, MA RESSELL, MT TURNER, MS TI TELESCOPE SEARCH FOR A 3-EV TO 8-EV AXION SO PHYSICAL REVIEW LETTERS LA English DT Article ID X-RAY OBSERVATIONS; RICH CLUSTERS; GALAXIES AB Axions of mass 3-8 eV should have a cosmological abundance of about 50 cm-3 and reside in rich clusters of galaxies. Their decays to two photons will produce a line at a wavelength lambda-alpha approximately 3100-8300 angstrom (width DELTA-lambda/lambda approximately 10(-2)). We have searched unsuccessfully for such a feature in the intergalactic light of three rich clusters, closing this "window," and leaving open only the window from 10(-6) to 10(-3) eV. This implies that if the axion exists, it likely comprises the dark matter. Our flux limits are of relevance to other relics whose decays produce monoenergetic photons. C1 NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV CHICAGO,ENRICO FERMI INST,DEPT PHYS,CHICAGO,IL 60637. RP BERSHADY, MA (reprint author), UNIV CHICAGO,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637, USA. NR 29 TC 53 Z9 53 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 MAR 18 PY 1991 VL 66 IS 11 BP 1398 EP 1401 DI 10.1103/PhysRevLett.66.1398 PG 4 WC Physics, Multidisciplinary SC Physics GA FB937 UT WOS:A1991FB93700005 ER PT J AU KNUTSON, LD VIGDOR, SE JACOBS, WW SOWINSKI, J JOLIVETTE, PL WISSINK, SW BLOCH, C WHIDDON, C BYRD, RC AF KNUTSON, LD VIGDOR, SE JACOBS, WW SOWINSKI, J JOLIVETTE, PL WISSINK, SW BLOCH, C WHIDDON, C BYRD, RC TI CHARGE-SYMMETRY VIOLATION IN NEUTRON-PROTON ELASTIC-SCATTERING AT EN = 183 MEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID BREAKING; PI-D->GAMMA-NN AB Measurements of the spin dependence of n-p elastic scattering at E(n) = 183 MeV have been carried out with polarized neutrons and polarized protons. If charge symmetry holds, the two analyzing powers A(n) and A(p) must be equal. The measured value of DELTA-A = A(n) - A(p), averaged over the angular range 82.2-degrees less-than-or-equal-to theta-c.m. less-than-or-equal-to 116.1-degrees, is (33.1 +/- 5.9 +/- 4.3) x 10(-4). This result represents clear evidence of charge-symmetry violation in the strong interaction. The measurement agrees well with predictions from meson-exchange theory when these include the isospin mixing of the rho-0 and omega-0 mesons. C1 INDIANA UNIV,CYCLOTRON FACIL,BLOOMINGTON,IN 47408. HOPE COLL,HOLLAND,MI 49423. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP KNUTSON, LD (reprint author), UNIV WISCONSIN,MADISON,WI 53706, USA. NR 21 TC 34 Z9 34 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 MAR 18 PY 1991 VL 66 IS 11 BP 1410 EP 1413 DI 10.1103/PhysRevLett.66.1410 PG 4 WC Physics, Multidisciplinary SC Physics GA FB937 UT WOS:A1991FB93700008 ER PT J AU SCHWEPPE, J BELKACEM, A BLUMENFELD, L CLAYTOR, N FEINBERG, B GOULD, H KOSTROUN, VE LEVY, L MISAWA, S MOWAT, JR PRIOR, MH AF SCHWEPPE, J BELKACEM, A BLUMENFELD, L CLAYTOR, N FEINBERG, B GOULD, H KOSTROUN, VE LEVY, L MISAWA, S MOWAT, JR PRIOR, MH TI MEASUREMENT OF THE LAMB SHIFT IN LITHIUM-LIKE URANIUM (U89+) SO PHYSICAL REVIEW LETTERS LA English DT Article ID X-RAY SPECTROMETER; ATOMS AB The 2(2)P1/2-2(2)S1/2 (lowest-excited-state to ground-state) energy splitting in lithiumlike uranium, which has large quantum-electrodynamic corrections, has been measured using Doppler-tuned spectrometry. Our result, 280.59 +/- 0.10 eV, is more precise than current theory and is an 80-fold improvement over the previous most precise measurement of the Lamb shift in (heliumlike) uranium. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,ACCELERATOR & FUS RES DIV,BERKELEY,CA 94720. INST CURIE,PHYS & CHIM SECT,F-75005 PARIS,FRANCE. N CAROLINA STATE UNIV,DEPT PHYS,RALEIGH,NC 27695. NR 25 TC 198 Z9 199 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 18 PY 1991 VL 66 IS 11 BP 1434 EP 1437 DI 10.1103/PhysRevLett.66.1434 PG 4 WC Physics, Multidisciplinary SC Physics GA FB937 UT WOS:A1991FB93700014 ER PT J AU LARSSON, J AF LARSSON, J TI HERMITIAN STRUCTURE FOR THE LINEARIZED VLASOV-POISSON AND VLASOV-MAXWELL EQUATIONS SO PHYSICAL REVIEW LETTERS LA English DT Article AB The linearized Vlasov-Poisson and Vlasov-Maxwell equations are shown to have a structure closely related to the evolution equation of quantum mechanics, in terms of a nonstandard Hilbert space. This Hermitian structure yields information about spectral properties, as well as a theory for dynamical invariants. We find accordingly how certain well-known features of the spectrum generalize to the nonuniform case, and we also rederive a recently found exact dynamical invariant in a very natural and simple way. C1 UMEA UNIV,DEPT PLASMA PHYS,S-90187 UMEA,SWEDEN. RP LARSSON, J (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 14 TC 21 Z9 21 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 MAR 18 PY 1991 VL 66 IS 11 BP 1466 EP 1468 DI 10.1103/PhysRevLett.66.1466 PG 3 WC Physics, Multidisciplinary SC Physics GA FB937 UT WOS:A1991FB93700022 ER PT J AU NORTON, DP LOWNDES, DH SALES, BC BUDAI, JD CHAKOUMAKOS, BC KERCHNER, HR AF NORTON, DP LOWNDES, DH SALES, BC BUDAI, JD CHAKOUMAKOS, BC KERCHNER, HR TI SUPERCONDUCTIVITY AND HOLE DOPING IN PR0.5CA0.5BA2CU3O7-DELTA THIN-FILMS SO PHYSICAL REVIEW LETTERS LA English DT Article ID NORMAL-STATE PROPERTIES; PR; YBA2CU3OX AB We have grown superconducting Pr0.5Ca0.5Ba2Cu3O7-delta epitaxial thin films that exhibit a superconducting onset temperature of 43 K with T(c)(R = 0) = 34.9 K. This is the first time, to our knowledge, that 1:2:3-phase superconductivity has been achieved by substituting Ca for Pr, without the presence in the alloy of Y or any other rare-earth element R for which RBa2Cu3O7-delta is superconducting. This result supports the view that hole localization/filling contributes substantially to the suppression of superconductivity by Pr in PrBa2Cu3O7-delta, and clearly demonstrates that this suppression can be compensated by appropriate hole doping with Ca. RP NORTON, DP (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. RI Chakoumakos, Bryan/A-5601-2016; Budai, John/R-9276-2016 OI Chakoumakos, Bryan/0000-0002-7870-6543; Budai, John/0000-0002-7444-1306 NR 29 TC 164 Z9 164 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 18 PY 1991 VL 66 IS 11 BP 1537 EP 1540 DI 10.1103/PhysRevLett.66.1537 PG 4 WC Physics, Multidisciplinary SC Physics GA FB937 UT WOS:A1991FB93700040 ER PT J AU GIGSTAD, KM RICCI, JS MARKGRAF, JH CHRISTL, M KRAFT, A AF GIGSTAD, KM RICCI, JS MARKGRAF, JH CHRISTL, M KRAFT, A TI STRAINED HETEROCYCLIC-SYSTEMS .18. STRUCTURE OF 1,2,3-METHYLIDYNE-2,3-DIHYDRO-1H-CYCLOPENTA(B)QUINOXALINE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article ID MOLECULAR-STRUCTURE; CRYSTAL AB C12H8N2, M(r) = 180.211, monoclinic, P2(1)/n, a = 8.6126 (8), b = 12.5147 (13), c = 8.5484 (7) angstrom, beta = 99.663 (7)degrees, V = 908.31 (15) angstrom3, Z = 4, D(x) = 1.32 g cm-3, lambda(Cu K-alpha) = 1.5418 angstrom, mu = 5.93 cm-1, F(000) = 376, T = 291 K, final R = 0.063 for 1645 unique reflections. This study demonstrates that a fused strained ring system adjacent to the N atom of an azaarene results in an abnormally small C-N-C bond angle. C1 WILLIAMS COLL,DEPT CHEM,WILLIAMSTOWN,MA 01267. UNIV AM HUBLAND,INST ORGAN CHEM,W-8700 WURZBURG,GERMANY. UNIV SO MAINE,DEPT CHEM,PORTLAND,ME 04103. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 24 TC 0 Z9 0 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD MAR 15 PY 1991 VL 47 BP 587 EP 590 DI 10.1107/S0108270190006850 PN 3 PG 4 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA FE482 UT WOS:A1991FE48200038 ER PT J AU LEE, T MALONE, B BUELL, AB BLANK, ML AF LEE, T MALONE, B BUELL, AB BLANK, ML TI OCCURRENCE OF ETHER-CONTAINING INOSITOL PHOSPHOLIPIDS IN BOVINE ERYTHROCYTES SO BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS LA English DT Article ID VARIANT SURFACE GLYCOPROTEIN; GLYCOSYL-PHOSPHATIDYLINOSITOL; MEMBRANE ANCHOR; ACETYLCHOLINESTERASE; FORM; ACID RP LEE, T (reprint author), OAK RIDGE ASSOCIATED UNIV,DIV MED SCI,OAK RIDGE,TN 37831, USA. NR 29 TC 3 Z9 3 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0006-291X J9 BIOCHEM BIOPH RES CO JI Biochem. Biophys. Res. Commun. PD MAR 15 PY 1991 VL 175 IS 2 BP 673 EP 678 DI 10.1016/0006-291X(91)91618-M PG 6 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA FB952 UT WOS:A1991FB95200047 PM 1826838 ER PT J AU AKIBA, S NERIISHI, K BLOT, WJ KABUTO, M STEVENS, RG KATO, H LAND, CE AF AKIBA, S NERIISHI, K BLOT, WJ KABUTO, M STEVENS, RG KATO, H LAND, CE TI SERUM FERRITIN AND STOMACH-CANCER RISK AMONG A JAPANESE POPULATION SO CANCER LA English DT Article ID BODY IRON STORES; CARCINOMA AB Using stored serum samples collected during from 1970 to 1972 and/or 1977 to 1979 from a fixed population in Hiroshima and Nagasaki, Japan, serum ferritin, transferrin, and ceruloplasmin levels were determined immunologically for persons in whom stomach (233 cases) or lung cancer (84 cases) subsequently developed as well as for their controls. An elevated stomach cancer risk was associated with low antecedent serum ferritin levels, with more than a threefold excess among those in the lowest compared with the highest ferritin quintile. The risk did not vary with the time between blood collection and stomach cancer onset, remaining high among those with low ferritin levels 5 or more years before cancer diagnosis. Achlorhydria, diagnosed in a sample of the population about 10 years before the 1970-to-1972 blood collection and up to 25 years before cancer, was an independent marker of stomach cancer risk. In combination, low serum ferritin and achlorhydria were associated with a tenfold increase in the subsequent risk. No effect of transferrin or ceruloplasmin, independent of ferritin, was observed in the gastric cancer risk, and the risk of lung cancer was not related to these three serum proteins. These prospective findings indicate that biologic markers of an increased risk of stomach cancer can be detected long before cancer onset. C1 NCI, BETHESDA, MD 20892 USA. JAPAN NATL INST ENVIRONM STUDIES, IBARAKI, JAPAN. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP AKIBA, S (reprint author), RADIAT EFFECTS RES FDN, DEPT EPIDEMIOL, 5-2 HIJIYAMA PK, MINAMI KU, HIROSHIMA 732, JAPAN. FU NCI NIH HHS [N01-CP-71128] NR 25 TC 40 Z9 40 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 0008-543X J9 CANCER JI Cancer PD MAR 15 PY 1991 VL 67 IS 6 BP 1707 EP 1712 DI 10.1002/1097-0142(19910315)67:6<1707::AID-CNCR2820670638>3.0.CO;2-C PG 6 WC Oncology SC Oncology GA FC040 UT WOS:A1991FC04000037 PM 2001562 ER PT J AU MULLER, J BURGDORFER, J NOID, D AF MULLER, J BURGDORFER, J NOID, D TI SEMICLASSICAL AND QUANTAL EIGENENERGIES IN THE WAKE POTENTIAL SO CHEMICAL PHYSICS LETTERS LA English DT Article ID SEMI-CLASSICAL QUANTIZATION; RANDOM-PHASE APPROXIMATION; MULTIDIMENSIONAL SYSTEM; BINDING-ENERGIES; BOUND-STATES; EIGENVALUES; DYNAMICS; SURFACE AB We obtain a large number of eigenenergies for bound states of an electron in the wake potential of a fast highly charged ion traversing a solid. The set of semiclassical eigenenergies pertains to eigenstates localized in the regular part of the classical phase space where KAM tori exist. By comparing with a full quantal calculation using diagonalization of large Hamiltonian matrices we can directly associate individual quantum states with the classically regular and chaotic portions of the phase space. C1 OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. RP MULLER, J (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 26 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD MAR 15 PY 1991 VL 178 IS 1 BP 60 EP 64 DI 10.1016/0009-2614(91)85053-Y PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FB896 UT WOS:A1991FB89600010 ER PT J AU ATLURU, D WOLOSCHAK, GE ATLURU, S AF ATLURU, D WOLOSCHAK, GE ATLURU, S TI EFFECT OF A-63162 ON LYMPHOCYTE-PROLIFERATION, IL-2 PRODUCTION, MESSENGER-RNA FOR IL-2 AND LTB4 PRODUCTION FROM HUMAN MONONUCLEAR-CELLS SO FASEB JOURNAL LA English DT Meeting Abstract C1 ARGONNE NATL LAB,DEPT ENVIRONM & FOREST BIOL,ARGONNE,IL 60439. KANSAS STATE UNIV AGR & APPL SCI,DEPT ANAT & PHYSIOL,MANHATTAN,KS 66506. RI Woloschak, Gayle/A-3799-2017 OI Woloschak, Gayle/0000-0001-9209-8954 NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A979 EP A979 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55000364 ER PT J AU CAMPION, SR NIYOGI, SK AF CAMPION, SR NIYOGI, SK TI MODELS FOR THE ACTIVATION PATHWAY OF EPIDERMAL GROWTH-FACTOR RECEPTOR PROTEIN-TYROSINE KINASE SO FASEB JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV BIOL,PROT ENGN & MOLEC MUTAGENESIS PROGRAM,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A1184 EP A1184 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55001546 ER PT J AU CHANG, LY HOYT, PR WANG, TH KANAGALA, R HENLEY, DC YANG, DM YANG, WK AF CHANG, LY HOYT, PR WANG, TH KANAGALA, R HENLEY, DC YANG, DM YANG, WK TI STRUCTURAL AND FUNCTIONAL-STUDIES OF MURINE MBO-I REPEAT LTR (MRL) RETROVIRAL GENES ON THE Y-CHROMOSOME SO FASEB JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE,TN 37830. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A1166 EP A1166 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55001439 ER PT J AU FORTE, TM KRETCHMER, N SILLIMAN, K AF FORTE, TM KRETCHMER, N SILLIMAN, K TI HYPERTRIGLYCERIDEMIA AND UNUSUAL LIPOPROTEIN SUBCLASS DISTRIBUTIONS ASSOCIATED WITH LATE PREGNANCY SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A1070 EP A1070 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55000891 ER PT J AU GOLDSTEIN, B PERELSON, AS JONES, D KEVREKIDIS, IG AF GOLDSTEIN, B PERELSON, AS JONES, D KEVREKIDIS, IG TI INTERACTION OF IL-2 WITH ITS CELL-SURFACE RECEPTORS - INTERPRETATION OF EQUILIBRIUM BINDING DATA SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. PRINCETON UNIV,PRINCETON,NJ 08544. NR 1 TC 0 Z9 0 U1 0 U2 1 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 MAR 15 PY 1991 VL 5 IS 5 BP A1342 EP A1342 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55002461 ER PT J AU HAUSER, MR ENGLER, DA NIYOGI, SK COOK, JS AF HAUSER, MR ENGLER, DA NIYOGI, SK COOK, JS TI AROMATICITY AT POSITION 37 IN HUMAN EGF IS NOT OBLIGATORY FOR ACTIVITY SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE,TN 37830. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. NR 1 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A1183 EP A1183 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55001539 ER PT J AU LEE, KL YANG, DM MAKKINJE, A CHANG, LY AF LEE, KL YANG, DM MAKKINJE, A CHANG, LY TI TYROSINE AMINOTRANSFERASE MESSENGER-RNA TURNOVER IN CHO CELLS SO FASEB JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A1168 EP A1168 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55001451 ER PT J AU LEE, TC FITZGERALD, V BLANK, ML SNYDER, F AF LEE, TC FITZGERALD, V BLANK, ML SNYDER, F TI BIOSYNTHESIS OF PLASMENYLCHOLINE FROM PLASMENYLETHANOLAMINE IN HL-60 CELLS SO FASEB JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV MED SCI,OAK RIDGE,TN 37831. NR 0 TC 1 Z9 1 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A1154 EP A1154 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55001367 ER PT J AU LIBERTIN, CR BUCZEK, N WEAVER, P MOBARHAN, S WOLOSCHAK, GE AF LIBERTIN, CR BUCZEK, N WEAVER, P MOBARHAN, S WOLOSCHAK, GE TI DECREASED ALBUMIN MESSENGER-RNA IN IMMUNODEFICIENT WASTED MICE SO FASEB JOURNAL LA English DT Meeting Abstract C1 LOYOLA UNIV,MAYWOOD,IL 60153. ARGONNE NATL LAB,ARGONNE,IL 60439. RI Woloschak, Gayle/A-3799-2017 OI Woloschak, Gayle/0000-0001-9209-8954 NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A1450 EP A1450 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55003087 ER PT J AU MALONE, B BUELL, AB BLANK, ML LEE, TC AF MALONE, B BUELL, AB BLANK, ML LEE, TC TI OCCURRENCE OF ETHER-CONTAINING INOSITOL PHOSPHOLIPIDS IN BOVINE ERYTHROCYTES SO FASEB JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE ASSOCIATED UNIV,DIV MED SCI,OAK RIDGE,TN 37830. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A1153 EP A1153 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55001362 ER PT J AU SIMON, SI SKLAR, LA AF SIMON, SI SKLAR, LA TI NEUTROPHIL AGGREGATION MEASURED IN WHOLE-BLOOD BY FLOW-CYTOMETRY SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544. NR 1 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A1143 EP A1143 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55001305 ER PT J AU TADAKI, DK NIYOGI, SK AF TADAKI, DK NIYOGI, SK TI ANALYSIS BY SITE-DIRECTED MUTAGENESIS OF THE POSSIBLE ROLE OF TYROSINE-13 OF HUMAN EGF IN RECEPTOR-BINDING SO FASEB JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV BIOL,PROT ENGN & MOLEC MUTAGENESIS PROGRAM,OAK RIDGE,TN 37831. NR 0 TC 5 Z9 5 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A1183 EP A1183 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55001542 ER PT J AU WOFSY, C GOLDSTEIN, B AF WOFSY, C GOLDSTEIN, B TI CROSS-LINKING OF SURFACE ANTIBODIES AND FC-GAMMA RECEPTORS - THEORY AND APPLICATION SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A1423 EP A1423 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55002934 ER PT J AU UMBARGE, KO YAMAZAKI, M HAYASHI, F YAMAZAKI, A AF UMBARGE, KO YAMAZAKI, M HAYASHI, F YAMAZAKI, A TI HETEROGENEITY IN SUBUNITS OF TRANSDUCIN FROM RANA-CATESBIANA ROD PHOTORECEPTORS SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0146-0404 J9 INVEST OPHTH VIS SCI JI Invest. Ophthalmol. Vis. Sci. PD MAR 15 PY 1991 VL 32 IS 4 BP 1052 EP 1052 PG 1 WC Ophthalmology SC Ophthalmology GA FC762 UT WOS:A1991FC76201884 ER PT J AU EECKMAN, FH TEETERS, JL AF EECKMAN, FH TEETERS, JL TI PRINCIPLES OF RETINAL DESIGN CAN BE USED TO BUILD AN EFFECTIVE MOVING OBJECT DETECTION SYSTEM SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0146-0404 J9 INVEST OPHTH VIS SCI JI Invest. Ophthalmol. Vis. Sci. PD MAR 15 PY 1991 VL 32 IS 4 BP 1091 EP 1091 PG 1 WC Ophthalmology SC Ophthalmology GA FC762 UT WOS:A1991FC76202070 ER PT J AU VANOS, CFA LEUNG, KN KUNKEL, WB AF VANOS, CFA LEUNG, KN KUNKEL, WB TI PLASMA-GENERATOR-INDUCED EFFECTS ON THE DYNAMICS OF A NEGATIVE-ION SURFACE CONVERSION SOURCE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SEEDED HYDROGEN DISCHARGE; BARIUM SURFACE; H SOURCE; EXTRACTION; INJECTION; INTENSE; BEAMS AB The production of H- ions at a barium, magnesium, strontium, molybdenum, and lanthanum-hexaboride converter immersed in a hydrogen plasma have been investigated for pulsed and dc discharges. The scaling of the negative-ion output with incident positive-ion current on the converter depends greatly on the actual geometry and type of plasma generator. A less than linear scaling is observed in a multicusp system using filaments or rf to generate the discharge. A more than linear scaling is obtained in a configuration where the filament and the converter are separated by a permanent-magnet filter. For a rf plasma generator, there is a pronounced optimum in the relative position of antenna and converter. RP VANOS, CFA (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 41 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAR 15 PY 1991 VL 69 IS 6 BP 3485 EP 3493 DI 10.1063/1.348489 PG 9 WC Physics, Applied SC Physics GA FD440 UT WOS:A1991FD44000014 ER PT J AU ANTOLAK, AJ WILLIAMSON, W AF ANTOLAK, AJ WILLIAMSON, W TI ELASTIC-SCATTERING OF LOW-ENERGY POSITRONS BY BOUND SILICON AND GERMANIUM SO JOURNAL OF APPLIED PHYSICS LA English DT Note ID MULTICONFIGURATIONAL APPROACH; ATOMIC POLARIZABILITIES; ELECTRONS; IONS AB Elastic scattering differential and total cross sections for low-energy positron collisions with bound silicon and germanium atoms have been computed using partial wave analysis with static and polarization potentials. The calculations are performed at incident positron energies ranging from 0.2 to 500 eV. For each impact energy, an appropriate number of phase shifts are obtained by numerically integrating the radial wave equation to ensure convergence of the scattering amplitude. A simple parametrization of the total cross section in terms of the screened Rutherford cross section is also presented for use in Monte Carlo codes. C1 UNIV TOLEDO,DEPT PHYS & ASTRON,TOLEDO,OH 43606. RP ANTOLAK, AJ (reprint author), SANDIA NATL LABS,DIV THEORET,LIVERMORE,CA 94551, USA. NR 15 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAR 15 PY 1991 VL 69 IS 6 BP 3760 EP 3762 DI 10.1063/1.348471 PG 3 WC Physics, Applied SC Physics GA FD440 UT WOS:A1991FD44000054 ER PT J AU WEDEMAYER, GJ WEMMER, DE GLAZER, AN AF WEDEMAYER, GJ WEMMER, DE GLAZER, AN TI PHYCOBILINS OF CRYPTOPHYCEAN ALGAE - STRUCTURES OF NOVEL BILINS WITH ACRYLOYL SUBSTITUENTS FROM PHYCOERYTHRIN-566 SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID DISSIMILATORY NITRITE REDUCTASE; CHROOMONAS SP CRYPTOPHYCEAE; ATTACHMENT SITES; BETA-SUBUNIT; B-PHYCOERYTHRIN; ALPHA-SUBUNIT; LINKED PHYCOERYTHROBILINS; CRYPTOMONAD BILIPROTEINS; CYANIDIUM-CALDARIUM; LINKAGE DIVERSITY AB Cryptomonad strain CBD phycoerythrin 566 carries four open-chain tetrapyrrole (bilin) prosthetic groups: three singly thioether-linked bilins at alpha-19, beta-82, and beta-158 and a bilin linked through two thioether bonds at beta-50,61 (amino acid sequence numbering from Wilbanks, S. M., Wedemayer, G. J., and Glazer, A. N. (1989) J. Biol. Chem. 264, 17860-17867). The structures of all four peptide-linked prosthetic groups were determined by H-1 NMR spectroscopy. The bilin at beta-82 was identified as phycoerythrobilin (PEB), a common prosthetic group in cyanobacterial and red algal phycobiliproteins. The structures of the remaining bilins were novel. The bilin at alpha-19, designated Cys-bilin 618, differed from PEB in having additional double bonds between C-2 and C-3 of ring A and between C-12' and C-12", i.e. an acryloyl substituent at C-12 of ring C. The doubly linked bilin at beta-50,61 designated DiCys-bilin 584, differed from doubly linked PEB (Schoenleber, R. W., Lundell, D. J., Glazer, A. N., and Rapoport, H. (1984) J. Biol. Chem. 259, 5481-5484) in possessing an acryloyl substituent at C-12 of ring C in place of a propionyl substituent. Similarly, the bilin at beta-158, designated Cys-bilin 584, differed from singly-linked PEB in possessing an acryloyl substituent at C-12 of ring C in place of a propionyl substituent. The three novel cryptomonad bilins join heme d1 and chlorophylls c1, c2, and c3 as the only known porphyrin-derived natural products with acryloyl substituents. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, DIV BIOCHEM & MOLEC BIOL, MCB, STANLEY DONNER ASU, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, DEPT CHEM, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, DIV CHEM BIODYNAM, BERKELEY, CA 94720 USA. FU NIGMS NIH HHS [GM28994] NR 68 TC 25 Z9 26 U1 1 U2 3 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3996 USA SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD MAR 15 PY 1991 VL 266 IS 8 BP 4731 EP 4741 PG 11 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FC217 UT WOS:A1991FC21700013 PM 2002022 ER PT J AU MATHER, MW SPRINGER, P FEE, JA AF MATHER, MW SPRINGER, P FEE, JA TI CYTOCHROME-OXIDASE GENES FROM THERMUS-THERMOPHILUS - NUCLEOTIDE-SEQUENCE AND ANALYSIS OF THE DEDUCED PRIMARY STRUCTURE OF SUBUNIT-IIC OF CYTOCHROME-CAA3 SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID AMINO-ACID SEQUENCE; C-OXIDASE; PARACOCCUS-DENITRIFICANS; MITOCHONDRIAL GENOME; EXTREME THERMOPHILE; MEMBRANE-PROTEINS; DNA-SEQUENCE; LEISHMANIA-TARENTOLAE; RESPIRATORY PROTEINS; PSEUDOMONAS-STUTZERI AB Cytochrome caa3, a cytochrome c oxidase from Thermus thermophilus, is a two-subunit enzyme containing the four canonical metal centers of cytochrome c oxidases (cytochromes a and a3; copper centers Cu(A) and Cu(B)) and an additional cytochrome c. The smaller subunit contains heme C and was termed the C-protein. We have cloned the genes encoding the subunits of the oxidase and determined the nucleotide sequence of the C-protein gene. The gene and deduced primary amino acid sequences establish that both the gene and the protein are fusions with a typical subunit II sequence and a characteristic cytochrome c sequence; we now call this subunit IIc. The protein thus appears to represent a covalent joining of substrate (cytochrome c) to its enzyme (cytochrome c oxidase). In common with other subunits II, subunit IIc contains two hydrophobic segments of amino acids near the amino terminus that probably for transmembrane helices. Variability analysis of the Thermus and other subunit II sequences suggests that the two putative transmembrane helices in subunit II may be located on the surface of the hydrophobic portion of the intact cytochrome oxidase protein complex. Also in common with other subunits II is a relatively hydrophilic intermembrane domain containing a set of conserved amino acids (2 cysteines and 2 histidines) which have previously been proposed by others to serve as ligands to the Cu(A) center. We compared the subunit IIc sequence with that of related proteins. N2O reductase of Pseudomonas stutzeri, a multi-copper protein that appears to contain a Cu(A) site (Scott, R. A., Zumft, W. G., Coyle, C. L., and Dooley, D. M. (1989) Proc. Natl. Acad. Sci. U.S.A. 86, 4082-4086), contains a 59-residue sequence element that is homologous to the "Cu(A) sequence motif" found in cytochrome oxidase subunits II, including all four putative copper ligands. By contrast, subunit II of the Escherichia coli quinol oxidase, cytochrome bo, also contains a region homologous to the Cu(A) motif, but it lacks the proposed metal binding histidine and cysteine residues; this is consistent with the apparent absence of Cu(A) from cytochrome bo. C1 UNIV CALIF LOS ALAMOS SCI LAB,STABLE ISOTOPE RESOURCE ISOTOPE & STRUCT CHEM GRP,LOS ALAMOS,NM 87545. RP MATHER, MW (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,BIOCHEM SECT,LOS ALAMOS,NM 87545, USA. FU NIGMS NIH HHS [GM35342] NR 106 TC 39 Z9 39 U1 0 U2 1 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3996 USA SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD MAR 15 PY 1991 VL 266 IS 8 BP 5025 EP 5035 PG 11 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FC217 UT WOS:A1991FC21700054 PM 1848234 ER PT J AU KNICKELBEIN, MB MENEZES, WJC AF KNICKELBEIN, MB MENEZES, WJC TI PHOTOIONIZATION SPECTROSCOPY OF NICKEL CLUSTERS - THE EFFECT OF AMMONIA ADSORPTION ON IONIZATION-POTENTIALS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID TRANSITION-METAL CLUSTERS; HYDROGEN CHEMISORPTION; IRON CLUSTERS; NH3; NI(111); SURFACE; CO; DECOMPOSITION; REACTIVITY; PRODUCTS AB The photoionization efficiency spectra of nickel clusters containing adsorbed ammonia have been recorded near threshold. Ionization potentials (IPs) have been assigned for 97 selected Ni(n) (NH3) m species, with n up to 56 atoms. We observe that nickel cluster IPs decrease upon ammonia adsorption, with the magnitude of the IP shifts varying linearly with the number of adsorbed molecules, in good agreement with a simple electrostatic model. Deviations from this behavior are observed for Ni5(NH3) m and Ni6(NH3) m clusters, in which adsorption of the first ammonia molecule produces a significantly larger IP drop than do subsequently adsorbed molecules. Such behavior may indicate the presence of unique adsorption sites on Ni5 and Ni6 preferentially occupied by the first ammonia molecule adsorbed onto these clusters, or alternatively, may indicate cluster rearrangement occurring as the result of chemisorption. Our results are discussed in light of studies of ammonia adsorption onto single crystal nickel surfaces. RP KNICKELBEIN, MB (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 39 TC 19 Z9 19 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAR 15 PY 1991 VL 94 IS 6 BP 4111 EP 4119 DI 10.1063/1.460644 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FD735 UT WOS:A1991FD73500001 ER PT J AU HALL, GE VANDENBOUT, D SEARS, TJ AF HALL, GE VANDENBOUT, D SEARS, TJ TI PHOTODISSOCIATION OF ACETONE AT 193 NM - ROTATIONAL-STATE AND VIBRATIONAL-STATE DISTRIBUTIONS OF METHYL FRAGMENTS BY DIODE-LASER ABSORPTION GAIN SPECTROSCOPY SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID N-3S RYDBERG STATE; GAS-PHASE; DISSOCIATION; DYNAMICS; CO; PHOTOFRAGMENTATION; RECOMBINATION; PHOTOLYSIS; EMISSION; (CH3)2CO AB Diode laser transient absorption/gain spectroscopy is used to monitor time-dependent populations of CD3 fragments formed in the photodissociation of acetone-d6 at 193 nm. Selected rotational lines have been measured in the v2 "umbrella" fundamental and first two hot bands, and in the v3 asymmetric stretching fundamental band. Substantial growth is observed in the vibrationless state on the time scale of vibrational relaxation. We estimate that only about 15% of the nascent CD3 population is formed in the vibrational states we detect: v2 = 1 and 2, v3 = 1, and the vibrationless state. Most of the nascent methyl population is evidently spread among many undetected vibrational states. These results complement previous measurements of acetone photofragments by infrared emission, multiphoton ionization, and laser-induced fluorescence. Our inferred global vibrational distribution is consistent with a two-step fragmentation. RP HALL, GE (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. RI Vanden Bout, David/J-8633-2013; Sears, Trevor/B-5990-2013; Hall, Gregory/D-4883-2013 OI Vanden Bout, David/0000-0001-5410-9421; Sears, Trevor/0000-0002-5559-0154; Hall, Gregory/0000-0002-8534-9783 NR 24 TC 59 Z9 59 U1 2 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAR 15 PY 1991 VL 94 IS 6 BP 4182 EP 4188 DI 10.1063/1.460741 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FD735 UT WOS:A1991FD73500008 ER PT J AU GAZDY, B BOWMAN, JM CHO, SW WAGNER, AF AF GAZDY, B BOWMAN, JM CHO, SW WAGNER, AF TI THEORETICAL STABILIZATION AND SCATTERING STUDIES OF RESONANCES IN THE ADDITION-REACTION H+CO-REVERSIBLE-HCO SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID H + CO; ROTATIONAL DISTRIBUTIONS; HYDROGEN-ATOMS; COLLISIONS; DISSOCIATION; EXCITATION; ENERGY; RRKM AB We report the first coordinated stabilization and coupled channel scattering calculations of resonances for a realistic, triatomic molecule, HCO, using a global, ab initio potential-energy surface. The two set of calculations are in excellent agreement with each other for the nine resonance energies reported. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP GAZDY, B (reprint author), EMORY UNIV,DEPT CHEM,ATLANTA,GA 30322, USA. NR 33 TC 26 Z9 26 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAR 15 PY 1991 VL 94 IS 6 BP 4192 EP 4194 DI 10.1063/1.460652 PG 3 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FD735 UT WOS:A1991FD73500010 ER PT J AU SCHATZ, GC SOKOLOVSKI, D CONNOR, JNL AF SCHATZ, GC SOKOLOVSKI, D CONNOR, JNL TI INFLUENCE OF TRANSITION-STATE RESONANCES ON INTEGRAL CROSS-SECTIONS AND PRODUCT ROVIBRATIONAL DISTRIBUTIONS FOR THE CL+HCL-]CLH+CL REACTION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID POTENTIAL-ENERGY SURFACE; SUDDEN DISTORTED-WAVE; KOHN VARIATIONAL PRINCIPLE; S-MATRIX VERSION; H + H-2; ANGULAR-DISTRIBUTIONS; PHOTODETACHMENT SPECTRUM; OSCILLATING REACTIVITY; CHEMICAL-REACTIONS; QUANTUM DYNAMICS AB An accurate quantum scattering calculation for the Cl + HCl --> ClH + Cl reaction has been performed. In particular, we study the influence of the lowest transition state resonance on the energy dependence of the state-to-state integral cross sections and product rovibrational distributions. The calculations use a recently developed centrifugal sudden hyperspherical (CSH) coordinate reactive scattering code. The Bondi-Connor-Manz-Romelt semiempirical potential energy surface is employed. All 161 partial waves needed for the convergence of the cross sections are included in the calculations. We find that the resonance perturbs certain reagent and product rotational levels of the vibrational ground state (v = 0, j = 14-16), as well as all open rotational levels (j = 0-8) of the first vibrationally excited state (v = 1). Transitions from the ground reagent to the ground product vibrational state, such as v = 0, j = 15 --> v' = 0, j' = 15, show almost no resonance structure in the integral cross sections; rather direct scattering dominates the partial wave sum. On the other hand, transitions between perturbed v = 0 rotational states and any v' = 1 rotational state, or between any v = 1 state and perturbed v' = 0 states, or between any v = 1 and any v' = 1 state, show a novel resonance feature in the integral cross sections. This novel feature is a sudden smooth "step" in the integral cross section, centered at the resonance energy for the partial wave with zero total angular momentum quantum number (J = 0). The step has a width equal to the J = 0 resonance width. Sometimes this step is superimposed on a slowly varying background which arises from direct scattering. A quantiative description of these resonant steps in the integral cross sections is developed using a J-shift approximation. Because the resonance influences all rotational states for v = v' = 1 in a similar way, there is no significant effect on the product rotational distributions due to the resonance. However, the resonance does produce detectable stepping behavior in the product vibrational distribution. C1 ARGONNE NATL LAB, DIV CHEM, THEORET CHEM GRP, ARGONNE, IL 60439 USA. UNIV MANCHESTER, DEPT CHEM, MANCHESTER M13 9PL, LANCS, ENGLAND. NR 79 TC 46 Z9 46 U1 1 U2 5 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 MAR 15 PY 1991 VL 94 IS 6 BP 4311 EP 4319 DI 10.1063/1.460617 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FD735 UT WOS:A1991FD73500023 ER PT J AU SUN, ZW FRANK, AJ AF SUN, ZW FRANK, AJ TI CHARACTERIZATION OF THE INTRACHAIN CHARGE-GENERATION MECHANISM OF ELECTRONICALLY CONDUCTIVE POLY (3-METHYLTHIOPHENE) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID RESONANT RAMAN-SCATTERING; SPIN-RESONANCE; ELECTROCHEMICAL PREPARATION; DOPED POLY(THIOPHENE); CONJUGATED POLYMERS; INFRARED ACTIVITY; OPTICAL-SPECTRA; POLYTHIOPHENE; FILMS; POLYACETYLENE AB The charge carriers and band structure that evolve upon doping of electrochemically grown poly (3-methylthiophene) (PMeT) films are characterized as a function of film preparation conditions by optical absorption, infrared, and electron spin resonance measurements. Regardless of the solvent (acetonitrile or propylene carbonate) or dopant anion (ClO4-, PF6-, BF4-, or CF3SO3-) used in preparing these films, bipolarons are found to play a prominent role in the charge-generation mechanism of PMeT at doping levels above 2 mol %. At low doping concentrations (< 2 mol %), structural disorder effects in the polymer are evident. The amount of structural disorder depends on the nature of the solvent and dopant anion. The binding energy of bipolarons to dopant anions was evaluated and found to be independent of the identity of the dopant anion. Solvent-dependent shifts in the bipolaron gap states and the binding energy are observed. These results are interpreted in terms of current theories of charge-carrier production in conductive polymers. C1 SOLAR ENERGY RES INST,GOLDEN,CO 80401. NR 57 TC 62 Z9 63 U1 1 U2 7 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 MAR 15 PY 1991 VL 94 IS 6 BP 4600 EP 4608 DI 10.1063/1.460588 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FD735 UT WOS:A1991FD73500054 ER PT J AU HONNELL, KG MCCOY, JD CURRO, JG SCHWEIZER, KS NARTEN, AH HABENSCHUSS, A AF HONNELL, KG MCCOY, JD CURRO, JG SCHWEIZER, KS NARTEN, AH HABENSCHUSS, A TI LOCAL-STRUCTURE OF POLYETHYLENE MELTS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Note ID INTEGRAL-EQUATION THEORY; MOLECULAR-DYNAMICS SIMULATIONS; POLYMER MELTS; LIQUIDS; FLUIDS; ALKANES; STATE C1 SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. OAK RIDGE NATL LAB, DIV CHEM, OAK RIDGE, TN 37830 USA. RI McCoy, John/B-3846-2010 OI McCoy, John/0000-0001-5404-1404 NR 33 TC 98 Z9 98 U1 1 U2 8 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 MAR 15 PY 1991 VL 94 IS 6 BP 4659 EP 4662 DI 10.1063/1.460594 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FD735 UT WOS:A1991FD73500060 ER PT J AU BUNTINE, MA BALDWIN, DP ZARE, RN CHANDLER, DW AF BUNTINE, MA BALDWIN, DP ZARE, RN CHANDLER, DW TI APPLICATION OF ION IMAGING TO THE ATOM-MOLECULE EXCHANGE-REACTION - H+HI-]H2+I SO JOURNAL OF CHEMICAL PHYSICS LA English DT Note ID EV COLLISION ENERGY; TO-STATE DYNAMICS; MULTIPHOTON IONIZATION; HYDROGEN HALIDES; DEUTERIUM ATOMS; H+HX COLLISIONS; PHOTODISSOCIATION; BEAM; HI; DISTRIBUTIONS C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94550. RI Zare, Richard/A-8410-2009; Buntine, Mark/B-6878-2009 OI Buntine, Mark/0000-0003-0525-2795 NR 27 TC 53 Z9 53 U1 1 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAR 15 PY 1991 VL 94 IS 6 BP 4672 EP 4675 DI 10.1063/1.460598 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FD735 UT WOS:A1991FD73500064 ER PT J AU KWONG, MK AF KWONG, MK TI OSCILLATION OF 1ST-ORDER DELAY EQUATIONS SO JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS LA English DT Article RP KWONG, MK (reprint author), ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439, USA. NR 4 TC 18 Z9 19 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 0022-247X J9 J MATH ANAL APPL JI J. Math. Anal. Appl. PD MAR 15 PY 1991 VL 156 IS 1 BP 274 EP 286 DI 10.1016/0022-247X(91)90396-H PG 13 WC Mathematics, Applied; Mathematics SC Mathematics GA FK216 UT WOS:A1991FK21600019 ER PT J AU AUTREY, ST ALNAJJAR, MS NELSON, DA FRANZ, JA AF AUTREY, ST ALNAJJAR, MS NELSON, DA FRANZ, JA TI ABSOLUTE RATE CONSTANTS FOR THE BETA-SCISSION REACTION OF THE 1-PHENYL-2-PHENOXYPROPYL RADICAL - A MODEL FOR RADICAL REACTIONS OF LIGNIN SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Article ID CHAIN DECOMPOSITION; ALKYL RADICALS; THERMOLYSIS; COAL; DISPROPORTIONATION; CYCLIZATION; TERMINATION; COMBINATION; SECONDARY; STATE AB Absolute rate expression for beta-scission of the phenoxy radical from the 1-phenyl-2-phenoxypropyl radical, forming cis- and trans-beta-methylstyrene, were determined by competition of beta-scission (k-beta) with abstraction of hydrogen from trimethylstannane (k(abs)). Relative rates (k-beta/k(abs)) were converted to absolute rates (k-beta)) by using a rate expression determined for abstraction of hydrogen atom from tributylstannane by the phenylethyl radical: log [k(abs)/(M-1s-1)] = (9.31 +/- 0.30) - (7.11 +/- 0.49)/theta, where theta = 2.303RT kcal/mol (errors are 2-sigma). The resulting expressions for beta-scission are log (k-beta,(trans)/s-1) = (13.45 +/- 0.26) - (16.94 +/- 0.52)/theta and log (k-beta,(cis)/s-1) = (13.41 +/- 0.3) - (19.3 +/- 0.75)/theta. The basis rate expression for abstraction of hydrogen from tributylstannane by the phenylethyl radical was determined in a competition of abstraction (k(abs) with self-termination (k(t), using the Smoluchowski expression for self-reaction of phenylethyl radical: log [2k(t)/(M-1s-1)] = 11.93 - 3.112/theta. Combining the Arrhenius parameters with the enthalpy change for beta-scission leads to activation barriers for addition of phenoxy radical to trans- and cis-beta-methylstyrene of 5.2 and 6.6 kcal/mol, respectively. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 35 TC 26 Z9 26 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3263 J9 J ORG CHEM JI J. Org. Chem. PD MAR 15 PY 1991 VL 56 IS 6 BP 2197 EP 2202 DI 10.1021/jo00006a043 PG 6 WC Chemistry, Organic SC Chemistry GA FC947 UT WOS:A1991FC94700043 ER PT J AU WIGNALL, GD ANNIS, BK TRIOLO, R AF WIGNALL, GD ANNIS, BK TRIOLO, R TI X-RAY-SCATTERING STUDIES OF THE STRUCTURE OF AQUEOUS HYDROXY-PROPYLCELLULOSE SOLUTIONS SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS LA English DT Article ID TEREPHTHALATE; WATER AB X-ray diffraction studies have been undertaken on aqueous solutions of hydroxy propyl-cellulose (HPC) over a wide range of the scattering vector Q. The experiments revealed only modest differences in local structure on a distance scale ca. 5-300-angstrom despite the fact that they covered concentrations generally interpreted as ranging from the isotropic (35.1 wt %) to the anisotropic liquid crystalline (LC) phase (53.5 wt %). Several models were used to interpret the small-angle scattering data, and each gave similar structural parameters and extrapolated intensities (Q --> 0) for both solutions. Peaks were observed with d-spacings ca. 12-17-angstrom in both materials. Wide-angle x-ray scattering (WAXS) showed slightly increased local order over a size range ca. 5-20-angstrom for the anisotropic solution, and this is consistent with a greater intensity of the 13-angstrom peak in this material. It is difficult to reconcile these findings with an interpretation of the LC state involving major differences with the isotropic phase and a high degree of orientational order extending over long length scales. C1 UNIV PALERMO,DIPARTMENTO CHIM FIS,I-90123 PALERMO,ITALY. RP WIGNALL, GD (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. OI Wignall, George/0000-0002-3876-3244 NR 19 TC 5 Z9 5 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-6266 J9 J POLYM SCI POL PHYS JI J. Polym. Sci. Pt. B-Polym. Phys. PD MAR 15 PY 1991 VL 29 IS 3 BP 349 EP 354 DI 10.1002/polb.1991.090290309 PG 6 WC Polymer Science SC Polymer Science GA EY171 UT WOS:A1991EY17100009 ER PT J AU SUGANO, K AF SUGANO, K TI FLOW-RATE INDEPENDENT GAS-MIXING SYSTEM FOR DRIFT CHAMBERS, USING SOLENOID VALVES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB We describe an inexpensive system for mixing argon and ethane gas for drift chambers which was used for an experiment at Fermilab. This system is based on the idea of intermittent mixing of gases with fixed mixing flow rates. A dual-action pressure switch senses the pressure in a mixed gas reservoir tank and operates solenoid valves to control mixing action and regulate reservoir pressure. This system has the advantages that simple controls accurately regulate the mixing ratio and that the mixing ratio is nearly flow-rate independent without readjustments. We also report the results of the gas analysis of various samplings, and the reliability of the system in long-term running. RP SUGANO, K (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 0 TC 0 Z9 0 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 15 PY 1991 VL 301 IS 3 BP 454 EP 456 DI 10.1016/0168-9002(91)90010-N PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FH625 UT WOS:A1991FH62500010 ER PT J AU ARNOLD, S LIU, CT WHITTEN, WB RAMSEY, JM AF ARNOLD, S LIU, CT WHITTEN, WB RAMSEY, JM TI ROOM-TEMPERATURE MICROPARTICLE-BASED PERSISTENT SPECTRAL HOLE BURNING MEMORY SO OPTICS LETTERS LA English DT Article ID RESONANCES AB We show both theoretically and experimentally that a random distribution of spherical microparticles may be used as a spectral hole burning memory. This microparticle hole burning memory, which can be both written and read at room temperature, is a direct consequence of the properties of morphology-dependent resonances of microparticles. C1 OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. RP ARNOLD, S (reprint author), POLYTECH INST NEW YORK,DEPT PHYS,MICROPARTICLE PHOTOPHYS LAB,333 JAY ST,BROOKLYN,NY 11201, USA. NR 7 TC 60 Z9 63 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD MAR 15 PY 1991 VL 16 IS 6 BP 420 EP 422 DI 10.1364/OL.16.000420 PG 3 WC Optics SC Optics GA FA222 UT WOS:A1991FA22200024 PM 19773953 ER PT J AU COHEN, ML AF COHEN, ML TI PREDICTING NEW SOLIDS AND THEIR PROPERTIES SO PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES LA English DT Article ID NONLOCAL-PSEUDOPOTENTIAL APPROACH; STRUCTURAL-PROPERTIES; METALLIC HYDROGEN; SHELL STRUCTURE; DIAMOND; SUPERCONDUCTIVITY; TRANSITIONS; CLUSTERS; PHASES; STATE AB It is now possible to predict properties of materials using quantum theory and minimal information about the constituent atoms of a solid. Accurate calculations explaining and, in some cases, predicting electronic, structural, vibrational, and even superconducting properties of solids have been performed. Here we provide an overview of this area with emphasis on the predictive capacity of the approach. A few of the applications which will be highlighted include the analysis of high-pressure structures of solid, compounds having very low compressibilities, and metallic hydrogen. RP UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, DEPT PHYS, DIV MAT SCI, BERKELEY, CA 94720 USA. NR 41 TC 17 Z9 17 U1 0 U2 1 PU ROYAL SOC PI LONDON PA 6-9 CARLTON HOUSE TERRACE, LONDON SW1Y 5AG, ENGLAND SN 1364-503X EI 1471-2962 J9 PHILOS T R SOC A JI Philos. Trans. R. Soc. A-Math. Phys. Eng. Sci. PD MAR 15 PY 1991 VL 334 IS 1635 BP 501 EP 513 DI 10.1098/rsta.1991.0030 PG 13 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FE326 UT WOS:A1991FE32600010 ER PT J AU GYORFFY, BL STOCKS, GM GINATEMPO, B JOHNSON, DD NICHOLSON, DM PINSKI, FJ STAUNTON, JB WINTER, H AF GYORFFY, BL STOCKS, GM GINATEMPO, B JOHNSON, DD NICHOLSON, DM PINSKI, FJ STAUNTON, JB WINTER, H TI ORDER AND DISORDER IN METALLIC ALLOYS SO PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES LA English DT Article AB Self-consistent 'band theory', based on density functional theory, is a useful approach to describing the electron glue which holds solids together. However, its powerful group theoretic and numerical techniques cannot be deployed for disordered states of matter. The self-consistent KKR-CPA is an analogous method which is able to deal with some of these interesting cases. In particular, we show how it describes random metallic alloys, treating all the classic Hume-Rothery factors: size-effect, electronegativity and electrons per atom ratio (e:a) on more or less equal footing and from first principles. Moreover, we use the KKR-CPA framework to analyse the instability of the disorder state to compositional ordering processes and hence provide a first principle description of the forces which drive order-disorder transformations. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. UNIV MESSINA,INST FIS TEOR,I-98100 MESSINA,ITALY. SANDIA NATL LABS,LIVERMORE,CA 94551. UNIV CINCINNATI,DEPT PHYS,CINCINNATI,OH 45221. UNIV WARWICK,DEPT PHYS,COVENTRY CV4 7AL,W MIDLANDS,ENGLAND. KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,W-7500 KARLSRUHE 1,GERMANY. RP GYORFFY, BL (reprint author), UNIV BRISTOL,HH WILLS PHYS LAB,TYNDALL AVE,BRISTOL BS8 1TL,AVON,ENGLAND. RI Stocks, George Malcollm/Q-1251-2016 OI Stocks, George Malcollm/0000-0002-9013-260X NR 29 TC 13 Z9 13 U1 0 U2 1 PU ROYAL SOC LONDON PI LONDON PA 6 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5AG J9 PHILOS T ROY SOC A JI Philos. Trans. R. Soc. Lond. Ser. A-Math. Phys. Eng. Sci. PD MAR 15 PY 1991 VL 334 IS 1635 BP 515 EP 526 DI 10.1098/rsta.1991.0031 PG 12 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FE326 UT WOS:A1991FE32600011 ER PT J AU GRAY, KE KAMPWIRTH, RT MILLER, DJ MURDUCK, JM HAMPSHIRE, D HERZOG, R WEBER, HW AF GRAY, KE KAMPWIRTH, RT MILLER, DJ MURDUCK, JM HAMPSHIRE, D HERZOG, R WEBER, HW TI OBSERVATION OF THE CROSSOVER BETWEEN BULK FLUX PINNING AND JOSEPHSON PHASE SLIPS IN THE CRITICAL CURRENT OF ANTIGRANULOCYTES SUPERCONDUCTING NBN ALN MULTILAYER FILMS SO PHYSICA C LA English DT Article AB The critical current density, J(c) in granular NbN/AIN multilayer films shows a sharp crossover with reduced magnetic field. b = H/H(c2) where H(c2) is the upper critical field, from the (1-b)2 dependence associated with bulk flux pinning at large b to a much weaker dependence at smaller b. We interpret this as coexistence of bulk flux depinning with phase slips in intergranular Josephson junctions, such that the one with the smaller J(c) is observed. The dependences on b, pinning strength, Lorentz-force and neutron irradiation are all consistent with such a crossover. C1 MAX PLANCK INST SOLID STATE RES,HML,F-38042 GRENOBLE,FRANCE. UNIV WISCONSIN,CTR APPL SUPERCOND,MADISON,WI 53706. UNIV VIENNA,INST ATOM,A-1020 VIENNA,AUSTRIA. RP GRAY, KE (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. OI Hampshire, Damian/0000-0001-8552-8514 NR 20 TC 14 Z9 14 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 MAR 15 PY 1991 VL 174 IS 4-6 BP 340 EP 344 DI 10.1016/0921-4534(91)91566-M PG 5 WC Physics, Applied SC Physics GA FE241 UT WOS:A1991FE24100011 ER PT J AU SHARMA, RP ROTELLA, FJ JORGENSEN, JD REHN, LE AF SHARMA, RP ROTELLA, FJ JORGENSEN, JD REHN, LE TI NEUTRON-DIFFRACTION AND ION-CHANNELING INVESTIGATIONS OF ATOMIC DISPLACEMENTS IN YBA2CU3O7-DELTA BETWEEN 10-K AND 300-K SO PHYSICA C LA English DT Article ID SUPERCONDUCTING TRANSITION-TEMPERATURE; SINGLE-CRYSTAL YBA2CU3O7-DELTA; HIGH-TC SUPERCONDUCTORS; POWDER DIFFRACTION; YBA2CU3O6.9; SCATTERING; ANOMALIES AB Neutron powder diffraction was used to investigate the structural and vibrational properties of a single-phase ceramic specimen of YBa2Cu3O7-delta in the temperature range from 10 to 300 K. Measurements were taken at closely-spaced (10 K) intervals between 50 and 150 K, and the data were refined to a precision equal to or exceeding that achieved in previous studies. No clear evidence is found for an anomalous change in any of the structural parameters, including the orthorhombicity parameter, 2(b-a)/(a+b), in the vicinity of T(c). The vibrational properties obtained from the neutron diffraction data are compared with previous results from ion-channeling in single-crystals of YBa2Cu3O7-delta; these latter results revealed a clear anomaly at T(c) in displacements of the Cu(1), Cu(2) and O(4) atoms in the a-b plane. The average vibrational properties of the lattice atoms determined from the two techniques agree quite well, showing an overall decrease in the apparent vibrational amplitude from 300 to 100 K, followed by a further drop as the temperature is lowered through T(c). The evidence for an abrupt change (approximately 0.015 angstrom) in displacement amplitude at T(c) is clearly much stronger in the channeling results; the magnitude of any anomaly in the diffraction results approaches the statistical uncertainty. The absence of a clear abrupt change in the neutron results at T(c) suggests that the ion channeling anomaly is not due to an overall reduction in average vibration amplitude, but arises instead from a strongly correlated sequence of Cu and O(4) displacements appearing in the superconducting state. RP SHARMA, RP (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 34 TC 70 Z9 70 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 MAR 15 PY 1991 VL 174 IS 4-6 BP 409 EP 422 DI 10.1016/0921-4534(91)91577-Q PG 14 WC Physics, Applied SC Physics GA FE241 UT WOS:A1991FE24100022 ER PT J AU GEISER, U SCHULTZ, AJ WANG, HH WATKINS, DM STUPKA, DL WILLIAMS, JM SCHIRBER, JE OVERMYER, DL JUNG, D NOVOA, JJ WHANGBO, MH AF GEISER, U SCHULTZ, AJ WANG, HH WATKINS, DM STUPKA, DL WILLIAMS, JM SCHIRBER, JE OVERMYER, DL JUNG, D NOVOA, JJ WHANGBO, MH TI STRAIN INDEX, LATTICE SOFTNESS AND SUPERCONDUCTIVITY OF ORGANIC DONOR-MOLECULE SALTS - CRYSTAL AND ELECTRONIC-STRUCTURES OF 3 ISOSTRUCTURAL SALTS KAPPA-(BEDT-TTF)2CU[N(CN)2]CL, KAPPA-(BEDT-TTF)2CU[N(CN)2]BR, KAPPA-(BEDT-TTF)2CU[N(CN)2]I SO PHYSICA C LA English DT Article ID AMBIENT-PRESSURE SUPERCONDUCTIVITY; ENERGY-GAP; BETA-(BEDT-TTF)2I3; (BEDT-TTF)2CU(NCS)2; (MDT-TTF)2AUI2; TEMPERATURES; CONDUCTIVITY; TRANSITION; MODULATION; DISORDER AB The recently discovered kappa-phase salts kappa-(BEDT-TTF)2]Cu[N(CN)2]X (X = Cl, Br, I) are isostructural but differ in their superconducting properties: the Br-salt is an ambient-pressure superconductor with T(c) = 11.6 K, the Cl-salt becomes superconducting (T(c) = 12.8 K) under a slight applied pressure of 0.3 kbar, and the I-salt does not exhibit superconductivity under an applied-pressure of up to 5 kbar. We examine the structural and electronic properties of these three salts on the basis of their crystal structures determined at 127 K by single crystal X-ray diffraction measurements. The band electronic structures of the three salts are virtually the same and do not account for the differences in the conduction properties. The differences in the three salts with regard to superconductivity are examined from the viewpoint of lattice softness by calculating strain indices for short intermolecular contacts. The random potential arising from ethylene group conformational disorder prevents superconductivity in the iodide salt. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. N CAROLINA STATE UNIV,DEPT CHEM,RALEIGH,NC 27695. RP GEISER, U (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. RI Novoa, Juan/B-3525-2013 OI Novoa, Juan/0000-0003-3577-1182 NR 40 TC 150 Z9 150 U1 3 U2 20 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD MAR 15 PY 1991 VL 174 IS 4-6 BP 475 EP 486 DI 10.1016/0921-4534(91)91586-S PG 12 WC Physics, Applied SC Physics GA FE241 UT WOS:A1991FE24100031 ER PT J AU HOLIAN, BL VOTER, AF WAGNER, NJ RAVELO, RJ CHEN, SP HOOVER, WG HOOVER, CG HAMMERBERG, JE DONTJE, TD AF HOLIAN, BL VOTER, AF WAGNER, NJ RAVELO, RJ CHEN, SP HOOVER, WG HOOVER, CG HAMMERBERG, JE DONTJE, TD TI EFFECTS OF PAIRWISE VERSUS MANY-BODY FORCES ON HIGH-STRESS PLASTIC-DEFORMATION SO PHYSICAL REVIEW A LA English DT Article ID EMBEDDED-ATOM-METHOD; FCC METALS CU; MOLECULAR-DYNAMICS; ALLOYS; AG; AU; NI; PD AB We propose a model embedded-atom (many-body) potential and test it against an effective, density-independent, pairwise-additive potential in a variety of nonequilibrium molecular-dynamics simulations of plastic deformation under high stress. Even though both kinds of interactions have nearly the same equilibrium equation of state, the defect energies (i.e., vacancy formation and surface energies) are quite different. As a result, we observe significant qualitative differences in flow behavior between systems characterized by purely pairwise interactions versus higher-order many-body forces. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV APPL THEORET PHYS,LOS ALAMOS,NM 87545. THINKING MACHINES CORP,CAMBRIDGE,MA 02142. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP HOLIAN, BL (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,T-12,MS-B268,LOS ALAMOS,NM 87545, USA. RI Wagner, Norman/B-6558-2012; OI Wagner, Norman/0000-0001-9565-619X; Voter, Arthur/0000-0001-9788-7194 NR 12 TC 86 Z9 86 U1 0 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAR 15 PY 1991 VL 43 IS 6 BP 2655 EP 2661 DI 10.1103/PhysRevA.43.2655 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FD045 UT WOS:A1991FD04500006 ER PT J AU ROZSNYAI, BF AF ROZSNYAI, BF TI PHOTOABSORPTION IN HOT PLASMAS BASED ON THE ION-SPHERE AND ION-CORRELATION MODELS SO PHYSICAL REVIEW A LA English DT Article ID DENSITY-FUNCTIONAL THEORY; HYDROGEN PLASMAS AB In hot plasmas the theoretically predicted photoabsorption cross sections rest upon the electronic states predicted by the plasma model. We compare the theoretical photoabsorption based on two models, the ion-sphere model and the ion-correlation model. We discuss the underlying physics and present calculations for iron, aluminum, and bromine plasmas, and also for a mixture of 14 elements under conditions occurring below the convective region of the sun. RP ROZSNYAI, BF (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 808,L-299,LIVERMORE,CA 94550, USA. NR 22 TC 41 Z9 41 U1 2 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAR 15 PY 1991 VL 43 IS 6 BP 3035 EP 3043 DI 10.1103/PhysRevA.43.3035 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FD045 UT WOS:A1991FD04500045 ER PT J AU ZIOLKOWSKI, RW TIPPETT, MK AF ZIOLKOWSKI, RW TIPPETT, MK TI COLLECTIVE EFFECT IN AN ELECTRON-PLASMA SYSTEM CATALYZED BY A LOCALIZED ELECTROMAGNETIC-WAVE SO PHYSICAL REVIEW A LA English DT Article ID EQUATION AB The possibility of the existence of an essentially single-species plasma state represented by a stable packet of charged particles moving collectively through space-time is examined. The collective plasma state is catalyzed by a localized electromagnetic wave. Condensation to this state is shown to occur on a very short time scale. The model treats the particle packet as a warm electron plasma (fluid) and self-consistently incorporates the resulting electromagnetic field. Predicted characteristics of the localized particle packet and its associated electromagnetic fields compare favorably with recent experimental data. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RI Tippett, Michael/C-6286-2011 OI Tippett, Michael/0000-0002-7790-5364 NR 7 TC 11 Z9 11 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAR 15 PY 1991 VL 43 IS 6 BP 3066 EP 3072 DI 10.1103/PhysRevA.43.3066 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FD045 UT WOS:A1991FD04500048 ER PT J AU PENETRANTE, BM BARDSLEY, JN AF PENETRANTE, BM BARDSLEY, JN TI RESIDUAL ENERGY IN PLASMAS PRODUCED BY INTENSE SUBPICOSECOND LASERS SO PHYSICAL REVIEW A LA English DT Article ID ABOVE-THRESHOLD IONIZATION; X-RAY EMISSION; POPULATION INVERSIONS; NOBLE-GASES; RARE-GASES; PULSES; AMPLIFICATION; FIELD; SPECTROSCOPY; RADIATION AB This paper presents parameter studies to find the optimum conditions for the production of a cold highly ionized plasma suitable for the generation of recombination x-ray lasers. The effect of space-charge fields on the residual electron energy of optical-field-ionized plasmas is studied using a classical theory of above-threshold ionization and particle-in-cell simulations. The dependence of the residual energy on the pump-laser wavelength and peak intensity is strongly influenced by the dependence of the quiver energy on these parameters. The effect of space-charge fields indicates that the residual energy can be minimized by a suitable matching of the laser pulse length to the plasma density. The effect of collisional heating on the residual energy is also discussed. RP PENETRANTE, BM (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV HIGH TEMP PHYS,LIVERMORE,CA 94550, USA. NR 54 TC 120 Z9 122 U1 0 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAR 15 PY 1991 VL 43 IS 6 BP 3100 EP 3113 DI 10.1103/PhysRevA.43.3100 PG 14 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FD045 UT WOS:A1991FD04500052 ER PT J AU SCHARF, R SUNDARAM, B AF SCHARF, R SUNDARAM, B TI CLASSICAL AND QUANTAL MORPHOLOGY OF A PIECEWISE-LINEAR STANDARD MAP SO PHYSICAL REVIEW A LA English DT Note ID INVARIANT CIRCLES; PERIODIC-ORBITS; CHAOS; MECHANICS; SYSTEMS; SCARS AB We consider a standard map with a continuous, piecewise-linear forcing term. The piecewise linearity allows for an extremely accurate calculation of the classical manifolds and associated homoclinic tangles. A simple coding for the periodic orbits is another useful property of the map. The quantized map is then studied and the resolution of stable and unstable invariant classical structures by the quantum eigenstates is assessed. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP SCHARF, R (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. RI Sundaram, Bala/A-6532-2010 OI Sundaram, Bala/0000-0002-1728-704X NR 23 TC 9 Z9 9 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 MAR 15 PY 1991 VL 43 IS 6 BP 3183 EP 3186 DI 10.1103/PhysRevA.43.3183 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FD045 UT WOS:A1991FD04500071 ER PT J AU ZAK, J MOOG, ER LIU, C BADER, SD AF ZAK, J MOOG, ER LIU, C BADER, SD TI MAGNETOOPTICS OF MULTILAYERS WITH ARBITRARY MAGNETIZATION DIRECTIONS SO PHYSICAL REVIEW B LA English DT Article ID LAYERED STRUCTURES; PLASMA RESONANCE; CHARGE-CARRIERS; ANISOTROPY; FILMS; HYSTERESIS; MONOLAYER; CU(100); PD/CO; IRON AB Equations are derived for determining magneto-optic coefficients in multilayer systems with arbitrary directions of their magnetizations. The equations are cast in a matrix form that is suitable for numerical simulations. This establishes a framework for calculating the Kerr and Faraday effects for a multilayer system in much the same way as has been applied previously to the bulk. Numerical Kerr results are presented for the following systems: bulk Fe, an overlayer of 50 angstrom of Fe on Au, and for an Fe/Au superlattice for different directions of the magnetization and different angles of incidence. C1 TECHNION ISRAEL INST TECHNOL,DEPT PHYS,HAIFA,ISRAEL. RP ZAK, J (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013 NR 48 TC 177 Z9 177 U1 2 U2 24 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 MAR 15 PY 1991 VL 43 IS 8 BP 6423 EP 6429 DI 10.1103/PhysRevB.43.6423 PG 7 WC Physics, Condensed Matter SC Physics GA FC704 UT WOS:A1991FC70400014 ER PT J AU HONG, T FREEMAN, AJ AF HONG, T FREEMAN, AJ TI EFFECT OF ANTIPHASE BOUNDARIES ON THE ELECTRONIC-STRUCTURE AND BONDING CHARACTER OF INTERMETALLIC SYSTEMS - NIAL SO PHYSICAL REVIEW B LA English DT Article ID 1050 DEGREES K; SINGLE-CRYSTALS; PLASTIC-DEFORMATION; UNIFORM DEFORMATION; COHESIVE PROPERTIES; ROOM-TEMPERATURE; WEAK-BEAM; DISLOCATIONS; TRANSITION; DUCTILITY AB The possible origin of the high degree of brittleness, i.e., low ductility, of the NiAl-based alloys in the B2 structure is investigated by all-electron self-consistent total-energy linear-muffin-tin-orbital calculations. Using a supercell approach (with up to 20 atoms/unit cell), the energetics of the two simplest antiphase boundaries (APB's) for NiAl in the B2 structure-namely the 1/2 [111] on {110} and 1/2 [111] on {112}-are calculated assuming no relaxation at the interface. We find APB energies of the order of 800 mJ/m2 for both cases. Since the calculated APB energies are very high, [111] slip is unlikely to occur-as suggested experimentally and by some phenomenological theories. By substituting Ni or Al with V, Cr, or Mn at the APB interfacial planes, remarkably decreased APB energies are obtained. These theoretical results on simplified model systems may suggest a way to decrease the APB energy in order to eliminate one of the possible reasons for the brittleness at ambient temperatures. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP HONG, T (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. NR 72 TC 88 Z9 89 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 MAR 15 PY 1991 VL 43 IS 8 BP 6446 EP 6458 DI 10.1103/PhysRevB.43.6446 PG 13 WC Physics, Condensed Matter SC Physics GA FC704 UT WOS:A1991FC70400018 ER PT J AU AGER, JW VEIRS, DK ROSENBLATT, GM AF AGER, JW VEIRS, DK ROSENBLATT, GM TI SPATIALLY RESOLVED RAMAN STUDIES OF DIAMOND FILMS GROWN BY CHEMICAL VAPOR-DEPOSITION SO PHYSICAL REVIEW B LA English DT Article ID IMPLANTED GAAS; SCATTERING; PHONON; SPECTRUM; SI; PRESSURE; GE AB The frequency and line shape of the diamond Raman line are examined in detail for a series of microwave-plasma-assisted chemical-vapor-deposition films grown on Si. The Raman lines in the films appear at higher frequency (shifts of up to 3 cm-1) than that of natural diamond and the observed lines are symmetric with broader linewidths than that of natural diamond, ranging from 5.7 to 17.1 cm-1. In addition, the line frequencies and linewidths are correlated; the films with the highest vibrational frequencies have the largest linewidths. The data include single-point measurements on eight films grown under different conditions as well as 500 data points from different positions on a single film that were obtained in a spatially resolved Raman experiment. Several mechanisms for the frequency shift and the correlation of the linewidth with frequency are considered including phonon confinement, residual stress, and defect scattering. Contrary to the observations, Raman line shapes computed from the phonon-confinement model (which has been used successfully to model Raman scattering in microcrystalline Si and GaAs), using phonon-dispersion curves for diamond from the literature, are highly asymmetric at the linewidths observed. It is concluded that the observed shifts in the diamond Raman line do not arise from phonon confinement alone and arise primarily from compressive stress. The line broadening is also not produced by phonon confinement alone and may arise from decreasing phonon lifetime associated with scattering from defects or from an inhomogeneous stress distribution in the films. The observed correlation between Raman line frequency and width suggests that the degree of compressive stress may be associated with the density of microcrystalline defects. RP AGER, JW (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720, USA. OI Ager, Joel/0000-0001-9334-9751 NR 26 TC 212 Z9 216 U1 0 U2 22 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 MAR 15 PY 1991 VL 43 IS 8 BP 6491 EP 6499 DI 10.1103/PhysRevB.43.6491 PG 9 WC Physics, Condensed Matter SC Physics GA FC704 UT WOS:A1991FC70400023 ER PT J AU ALOUANI, M ALBERS, RC METHFESSEL, M AF ALOUANI, M ALBERS, RC METHFESSEL, M TI CALCULATED ELASTIC-CONSTANTS AND STRUCTURAL-PROPERTIES OF MO AND MOSI2 SO PHYSICAL REVIEW B LA English DT Article ID TRANSITION-METALS; ENERGY-BANDS; SILICIDES; WSI2; FREQUENCIES; MODULI; BCC; CR; NB AB Using an all-electron, self-consistent, full potential, linear muffin-tin-orbitals method within the local-density approximation of density-functional theory, we have studied the structural properties and the elastic constants of Mo and MoSi2. The Mo and MoSi2 ground-state properties, lattice parameters, cohesive energy, and (for Mo) elastic constants are found to be in good agreement with the experimental results. Different structures in the angle-integrated photoemission spectrum of MoSi2 can be satisfactorily explained in terms of various features present in the calculated total density of states. Since there have been no previous theoretical or experimental determinations, our calculations provide the first available information on the elastic constants of MoSi2. For both Mo and MoSi2 we have calculated the stress tensors for the experimental structures and have minimized their elastic energies. We have found that the lattice parameters and the ground-state total energies of Mo and MoSi2 obtained from both the elastic energy and the total-energy minimizations are about the same, and that the lattice parameters are close to their experimental values. C1 FRITZ HABER INST,W-1000 BERLIN 33,GERMANY. RP ALOUANI, M (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. RI Alouani, Mebarek/A-9101-2011 OI Alouani, Mebarek/0000-0002-7985-5276 NR 44 TC 96 Z9 97 U1 3 U2 11 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 1991 VL 43 IS 8 BP 6500 EP 6509 DI 10.1103/PhysRevB.43.6500 PG 10 WC Physics, Condensed Matter SC Physics GA FC704 UT WOS:A1991FC70400024 ER PT J AU LEE, YH BISWAS, R SOUKOULIS, CM WANG, CZ CHAN, CT HO, KM AF LEE, YH BISWAS, R SOUKOULIS, CM WANG, CZ CHAN, CT HO, KM TI MOLECULAR-DYNAMICS SIMULATION OF THERMAL-CONDUCTIVITY IN AMORPHOUS-SILICON SO PHYSICAL REVIEW B LA English DT Article ID GLASSES; HEAT; LOCALIZATION; SOLIDS; SI AB The temperature-dependent thermal conductivity k(T) of amorphous silicon has been calculated from equilibrium molecular-dynamics simulations using the time correlations of the heat flux operator in which anharmonicity is explicitly incorporated. The Stillinger-Weber two- and three-body Si potential and the Wooten-Weaire-Winer a-Si model were utilized. The calculations correctly predict an increasing thermal conductivity at low temperatures (below 400 K). The k(T), for T > 400 K, is affected by the thermally generated coordination-defect states. Comparisons to both experiment and previous calculations will be described. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. JEONBUG NATL UNIV,DEPT PHYS,JEONBUG 560756,SOUTH KOREA. RP LEE, YH (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,MICROELECTR RES CTR,AMES,IA 50011, USA. RI Soukoulis, Costas/A-5295-2008; Lee, Young Hee/A-5424-2013 NR 23 TC 116 Z9 119 U1 2 U2 16 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 MAR 15 PY 1991 VL 43 IS 8 BP 6573 EP 6580 DI 10.1103/PhysRevB.43.6573 PG 8 WC Physics, Condensed Matter SC Physics GA FC704 UT WOS:A1991FC70400032 ER PT J AU LIU, AY COHEN, ML HASS, KC TAMOR, MA AF LIU, AY COHEN, ML HASS, KC TAMOR, MA TI STRUCTURAL-PROPERTIES OF A 3-DIMENSIONAL ALL-SP2 PHASE OF CARBON SO PHYSICAL REVIEW B LA English DT Note ID TOTAL-ENERGY; DIAMOND; SOLIDS; GRAPHITE AB We have studied the structural properties of a recently proposed, hypothetical, all-sp2 phase of carbon, using the first-principles pseudopotential total-energy method. Our results are compared with those of an earlier tight-binding calculation. While the two calculations yield equilibrium volumes and bond lengths that are in excellent agreement, there are discrepancies in the cohesive energy, elastic constants, and predicted stability of this phase. C1 FORD MOTOR CO,RES STAFF,DEARBORN,MI 48121. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP LIU, AY (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Liu, Amy/E-2266-2015 OI Liu, Amy/0000-0002-2011-1854 NR 16 TC 76 Z9 79 U1 0 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 MAR 15 PY 1991 VL 43 IS 8 BP 6742 EP 6745 DI 10.1103/PhysRevB.43.6742 PG 4 WC Physics, Condensed Matter SC Physics GA FC704 UT WOS:A1991FC70400053 ER PT J AU RICHARDS, PM AF RICHARDS, PM TI EQUILIBRIUM INTERFACE WIDTH FOR EPITAXIAL-GROWTH WITH STEP-HEIGHT-INDEPENDENT HOPPING OF ADATOMS SO PHYSICAL REVIEW B LA English DT Note AB The steady-state interface width sigma is calculated in a model of crystal growth where steps are smoothed by the hopping of noninteracting adatoms at a rate W independent of step height. sigma has the same logarithmic dependence on size as for diffusive smoothing, but a stronger-than-linear dependence on the ratio of the deposition rate to the hopping rate W. Simulations are in good agreement with a mean-field theory. RP RICHARDS, PM (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 1991 VL 43 IS 8 BP 6750 EP 6753 DI 10.1103/PhysRevB.43.6750 PG 4 WC Physics, Condensed Matter SC Physics GA FC704 UT WOS:A1991FC70400055 ER PT J AU SAMARA, GA BIEFELD, RM DAWSON, LR ZIPPERIAN, TE BARNES, CE AF SAMARA, GA BIEFELD, RM DAWSON, LR ZIPPERIAN, TE BARNES, CE TI PRESSURE-DEPENDENCE OF THE E2 AND E1 DEEP LEVELS IN GAAS, GAP, AND THEIR ALLOYS SO PHYSICAL REVIEW B LA English DT Note ID IRRADIATION-INDUCED DEFECTS; DEFORMATION POTENTIALS; ELECTRONIC LEVELS; SEMICONDUCTORS; SPECTROSCOPY; VACANCIES; SILICON AB Measurements of the effects of pressure on the thermal-electron emission rate and capture cross section for the E2 and E1 deep levels in GaAs, GaP, and their alloys have yielded the pressure dependences of the energies of these levels, allowed evaluation of the breathing-mode lattice relaxations accompanying carrier emission or capture by these levels, and revealed trends that lead to new insights. The results are consistent with a model which associates E2 with the (-/0) and E1 with the (2-/-) charge states of the As (or P) vacancy. RP SAMARA, GA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 21 TC 1 Z9 1 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 1991 VL 43 IS 8 BP 6772 EP 6775 DI 10.1103/PhysRevB.43.6772 PG 4 WC Physics, Condensed Matter SC Physics GA FC704 UT WOS:A1991FC70400061 ER PT J AU DIXIT, SN GUO, DD MAZUMDAR, S AF DIXIT, SN GUO, DD MAZUMDAR, S TI ESSENTIAL-STATES MECHANISM OF OPTICAL NONLINEARITY IN PI-CONJUGATED POLYMERS SO PHYSICAL REVIEW B LA English DT Note ID CHAINS AB We present a microscopic mechanism of optical nonlinearity in conjugated polymers. It is shown that the bulk of the nonlinearity is determined by only two well-defined channels, even though an infinite number of channels are possible in principle. We are able to explain the complete frequency dependence of the third-harmonic generation in both trans-polyacetylene and polydiacetylene within the same model without invoking weak Coulomb interactions between electrons or interchain interactions. C1 UNIV ARIZONA,DEPT PHYS,TUCSON,AZ 85721. RP DIXIT, SN (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 16 TC 172 Z9 173 U1 2 U2 14 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 MAR 15 PY 1991 VL 43 IS 8 BP 6781 EP 6784 DI 10.1103/PhysRevB.43.6781 PG 4 WC Physics, Condensed Matter SC Physics GA FC704 UT WOS:A1991FC70400065 ER PT J AU KUTZLER, FW PAINTER, GS AF KUTZLER, FW PAINTER, GS TI INTERCONFIGURATIONAL ENERGIES IN TRANSITION-METAL ATOMS USING GRADIENT-CORRECTED DENSITY-FUNCTIONAL THEORY SO PHYSICAL REVIEW B LA English DT Article ID SELF-INTERACTION CORRECTION; HIGHLY CORRELATED SYSTEMS; RELATIVISTIC CONTRIBUTIONS; EXCITATION-ENERGIES; ELECTRON-SYSTEMS; EXCHANGE; APPROXIMATION; FORMALISM; MOLECULES; ACCURATE AB The rapid variation of charge and spin densities in atoms and molecules provides a severe test for local-density-functional theory and for the use of gradient corrections. In the study reported in this paper, we use the Langreth, Mehl, and Hu (LMH) functional and the generalized gradient approximation (GGA) of Perdew and Yue to calculate s-d transition energies, 4s ionization energies, and 3d ionization energies for the 3d transition-metal atoms. These calculations are compared with results from the local-density functional of Vosko, Wilk, and Nusair. By comparison with experimental energies, we find that the gradient functionals are only marginally more successful than the local-density approximation in calculating energy differences between states in transition-metal atoms. The GGA approximation is somewhat better than the LMH functional for most of the atoms studied, although there are several exceptions. C1 OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37831 USA. RP TENNESSEE TECHNOL UNIV, DEPT CHEM, COOKEVILLE, TN 38505 USA. NR 36 TC 38 Z9 38 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 1991 VL 43 IS 9 BP 6865 EP 6872 DI 10.1103/PhysRevB.43.6865 PG 8 WC Physics, Condensed Matter SC Physics GA FD389 UT WOS:A1991FD38900001 ER PT J AU PAVAO, AC BRAGA, M TAFT, CA HAMMOND, BL LESTER, WA AF PAVAO, AC BRAGA, M TAFT, CA HAMMOND, BL LESTER, WA TI THEORETICAL-STUDY OF THE CO INTERACTION WITH 3D-METAL SURFACES SO PHYSICAL REVIEW B LA English DT Article ID STRETCHING FREQUENCY; ELECTRONIC-STRUCTURE; CARBON-MONOXIDE; FE(100) SURFACE; METAL-SURFACES; CHEMISORBED CO; CLUSTER MODEL; ADSORPTION; CR(110); DISSOCIATION AB Ab initio molecular-orbital calculations of the M-CO systems (M = Sc to Cu) combined with Pauling's resonating-valence-bond theory indicate that CO adsorption only on Sc, Ti, V, Cr, Mn, and Fe surfaces will be dissociative, and nondissociative on Co, Ni, and Cu surfaces, in agreement with the experimental evidence. The nature of the chemical bond, charge transfer, Fermi level, and other parameters of the CO interaction with 3d-metal surfaces is analyzed. The CO dissociation is described as a charge-transfer process with bonds resonating among the metal, C, and O atoms. CO dissociation in activated catalytic processes on modified 3d surfaces is discussed. C1 CHALMERS UNIV TECHNOL,DEPT PHYS CHEM,S-41296 GOTHENBURG,SWEDEN. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO DE JANEIRO,BRAZIL. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. RP PAVAO, AC (reprint author), UNIV FED PERNAMBUCO,DEPT QUIM FUNDAMENTAL,BR-50739 RECIFE,PE,BRAZIL. RI Pavao, Antonio/I-8002-2014 NR 49 TC 20 Z9 20 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 MAR 15 PY 1991 VL 43 IS 9 BP 6962 EP 6967 DI 10.1103/PhysRevB.43.6962 PG 6 WC Physics, Condensed Matter SC Physics GA FD389 UT WOS:A1991FD38900012 ER PT J AU POWELL, GL KIRKPATRICK, JR AF POWELL, GL KIRKPATRICK, JR TI SURFACE CONDUCTANCE AND THE DIFFUSION OF H AND D IN PD SO PHYSICAL REVIEW B LA English DT Article ID HYDROGEN; SOLUBILITY; DEUTERIUM; METALS; ABSORPTION; PD(111); ALLOYS AB The absorption of H and D into a palladium sphere of precise radius and density is examined experimentally with use of pressure-volume-temperature measurements and control techniques to achieve the stepwise boundary condition and constant pressure assumed in the common solutions to Fick's second law. Measurements were made at temperatures over the range of 298 to 1373 K after preparing the Pd by cyclic baking of the sphere in vacuum and in very pure H2 or D2. Near 473 K and higher temperatures, excellent agreement with Fick's-second-law solutions were obtained. Below 473 K, deviations from simple diffusion in the metal were observed and explained by postulating a surface conductance. From known solutions for diffusion in a sphere with a surface conductance, the diffusion coefficients (D) and the minimum achievable surface conductances (h) were determined to be D(H) = 3.512 X 10(-7)e-(2759.9 K)/T m2s-1, D(D) = 2.219 X 10(-7)e-(2538.0 K)/T m2s-1, and h(H) = h(D) = 4.05e-(4995.3 K)/T ms-1. C1 MARTIN MARIETTA ENERGY SYST INC,DIV COMP & TELECOMMUN,OAK RIDGE,TN 37831. RP POWELL, GL (reprint author), MARTIN MARIETTA ENERGY SYST INC,OAK RIDGE Y-12 PLANT,OAK RIDGE,TN 37831, USA. NR 23 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 MAR 15 PY 1991 VL 43 IS 9 BP 6968 EP 6976 DI 10.1103/PhysRevB.43.6968 PG 9 WC Physics, Condensed Matter SC Physics GA FD389 UT WOS:A1991FD38900013 ER PT J AU RICHARDS, PM AF RICHARDS, PM TI EFFECT OF CLUSTERING INTERACTIONS ON THE STEADY-STATE INTERFACE WIDTH DURING EPITAXIAL-GROWTH SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-BEAM EPITAXY; STEP DENSITY; OSCILLATIONS; DIFFRACTION; SURFACE AB The steady-state interface width or roughness during growth by molecular-beam epitaxy is treated theoretically, and results are compared with Monte Carlo simulations. Short-range cohesive interactions that stabilize small clusters are included. This extends previous work by the author, which considered only noninteracting adatoms. The qualitative features of that work remain: The mean-square width sigma-2 appears to saturate even in the limit of infinite interaction strength and sigma-2 increases logarithmically with the size of the lateral region over which observations are made. Both the near-neighbor width sigma-1(2) and the relative importance of the logarithmic dependence are greatly enhanced by interactions. The step density is also calculated. Agreement between theory and simulation data is good for the step density and relative size of the logarithmic dependence, but the theory underestimates sigma-1(2) by about a factor of 2 in the limit of strong interactions and relatively large deposition rates. As an aid to making contact with experimental results and other simulations, curves are shown for the temperature dependence with typical values of deposition rate and activation energies. RP RICHARDS, PM (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 20 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 1991 VL 43 IS 9 BP 6986 EP 6995 DI 10.1103/PhysRevB.43.6986 PG 10 WC Physics, Condensed Matter SC Physics GA FD389 UT WOS:A1991FD38900015 ER PT J AU ROZING, GJ MIJNARENDS, PE BENEDEK, R AF ROZING, GJ MIJNARENDS, PE BENEDEK, R TI FULLY RELATIVISTIC CALCULATION OF THE 2-PHOTON MOMENTUM DISTRIBUTION FOR POSITRON-ANNIHILATION IN TUNGSTEN SO PHYSICAL REVIEW B LA English DT Article ID ENERGY; SYMMETRY; SOLIDS AB A method is described for the calculation of the two-photon momentum distribution for positron annihilation, which employs the eigenvectors from a fully relativistic band-structure calculation. Although the usual nonrelativistic positron-electron overlap integral is used, effects of spin-orbit coupling on the two-photon momentum distribution are introduced via the band structure and the wave functions. The method is implemented for the relativistic linearized augmented-plane-wave method and applied to tungsten. C1 ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. RP NETHERLANDS ENERGY RES FDN, 1755 ZG PETTEN, NETHERLANDS. NR 21 TC 7 Z9 7 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 1991 VL 43 IS 9 BP 6996 EP 7002 DI 10.1103/PhysRevB.43.6996 PG 7 WC Physics, Condensed Matter SC Physics GA FD389 UT WOS:A1991FD38900016 ER PT J AU LYO, SK AF LYO, SK TI QUASI-HOLE LIFETIMES IN ELECTRON GASES AND ELECTRON-HOLE PLASMAS IN SEMICONDUCTOR QUANTUM-WELLS SO PHYSICAL REVIEW B LA English DT Article AB The lifetime of a final-state quasihole (i.e., an empty state under the Fermi level created, for example, by interband optical transitions) due to inelastic-scattering processes is calculated as a function of the quasihole energy in n-type and p-type modulation-doped quantum wells as well as in electron-hole plasmas in undoped quantum wells. Carrier-carrier scattering and carrier-longitudinal-optical-phonon interactions are considered for the energy-relaxation processes. For carrier-carrier scattering, quasiholes are found to decay through single-particle excitations without plasmon emission at zero temperature. The dependences of the scattering lifetimes on the well width, carrier density, in-plane effective carrier mass, and temperature are studied. The effects of static and dynamic dielectric screening are compared. The relevance of these results to recent luminescence data in modulation-doped quantum wells and to recent thermalization data in hot plasmas in undoped quantum wells is discussed. RP LYO, SK (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 8 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 1991 VL 43 IS 9 BP 7091 EP 7101 DI 10.1103/PhysRevB.43.7091 PG 11 WC Physics, Condensed Matter SC Physics GA FD389 UT WOS:A1991FD38900027 ER PT J AU KAMIONKOWSKI, M TURNER, MS AF KAMIONKOWSKI, M TURNER, MS TI DISTINCTIVE POSITRON FEATURE FROM PARTICLE DARK-MATTER ANNIHILATIONS IN THE GALACTIC HALO SO PHYSICAL REVIEW D LA English DT Article ID COSMIC-RAY ANTIPROTONS; PHOTINO-DOMINATED UNIVERSE; INTERACTING MASSIVE PARTICLES; MONOCHROMATIC GAMMA-RAYS; NEUTRAL-FERMION PAIRS; HIGH-ENERGY NEUTRINOS; ASTROPHYSICAL IMPLICATIONS; STANDARD MODEL; 2 PHOTONS; PROBE AB If the dark matter in our galactic halo consists of weakly interacting massive particles (WIMP's) heavier than the W+/- boson which have a significant annihilation branch into W+/- and Z(0) pairs, e.g., a Higgsino-like neutralino, a very distinctive feature in the cosmic-ray positron spectrum arises from W+ and Z(0) decays. Because of inherent astrophysical uncertainties such a signal is by no means guaranteed even if heavy WIMP's do comprise the galactic halo. However, the positron signature is virtually a "smoking gun" for particle dark matter in the halo and thus worthy of note. C1 FERMI NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. RP KAMIONKOWSKI, M (reprint author), UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637, USA. NR 47 TC 123 Z9 126 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 MAR 15 PY 1991 VL 43 IS 6 BP 1774 EP 1780 DI 10.1103/PhysRevD.43.1774 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FC300 UT WOS:A1991FC30000006 ER PT J AU GUPTA, R GURALNIK, G KILCUP, GW SHARPE, SR AF GUPTA, R GURALNIK, G KILCUP, GW SHARPE, SR TI QUENCHED SPECTRUM WITH STAGGERED FERMIONS SO PHYSICAL REVIEW D LA English DT Article ID HADRONIC MASS-SPECTRUM; LATTICE QCD; SUSSKIND FERMIONS; BETA=5.7 AB We present results for the spectrum of QCD in the quenched approximation using staggered fermions at beta = 5.7, 6.0, and 6.2. We use extended wall sources, which give a better projection onto the ground state, and allow us to study many nonlocal pion and rho states, as well as the DELTA baryon. Staggered flavor-symmetry breaking reduces dramatically from beta = 5.7 to 6.2. For beta = 6, the ratio m(N)/m-rho lies significantly below 1.5 for m(q) < m(s). At beta = 6 we study finite-volume effects using 16(3) x 40 and 24(3) x 40 lattices. We reanalyze our old data at beta = 6.2 and resolve the problem of the anomalously light scalar state. C1 BROWN UNIV,DEPT PHYS,PROVIDENCE,RI 02912. OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210. UNIV CALIF SANTA BARBARA,INST THEORET PHYS,SANTA BARBARA,CA 93106. UNIV WASHINGTON,DEPT PHYS,SEATTLE,WA 98195. RP GUPTA, R (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,T-8,MS-B285,LOS ALAMOS,NM 87545, USA. NR 38 TC 71 Z9 72 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 MAR 15 PY 1991 VL 43 IS 6 BP 2003 EP 2026 DI 10.1103/PhysRevD.43.2003 PG 24 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FC300 UT WOS:A1991FC30000033 ER PT J AU MCLERRAN, L MOTTOLA, E SHAPOSHNIKOV, ME AF MCLERRAN, L MOTTOLA, E SHAPOSHNIKOV, ME TI SPHALERONS AND AXION DYNAMICS IN HIGH-TEMPERATURE QCD SO PHYSICAL REVIEW D LA English DT Article ID ANOMALOUS ELECTROWEAK BARYON; NUMBER NON-CONSERVATION; WEINBERG-SALAM THEORY; FINITE TEMPERATURE; ASYMMETRY; VIOLATION; UNIVERSE; INSTANTONS; COSMOLOGY; VACUUM AB We consider the effects of sphaleronlike transitions in the high-temperature QCD plasma. Because of the chiral anomaly, these imply rapid chirality change, and strongly influence the dynamics of any axionic fields that may couple to the topological winding number of QCD. We derive a coupled set of equations describing the evolution of the axion field and chiral fermion density at high temperatures. The unsuppressed sphaleronlike transitions result in the damping of coherent axionic oscillations. The implications of this phenomenon for axion fields in early Universe cosmology is discussed. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. ACAD SCI USSR,INST NUCL RES,MOSCOW 117312,USSR. RP MCLERRAN, L (reprint author), UNIV MINNESOTA,SCH PHYS & ASTRON,INST THEORET PHYS,116 CHURCH ST,MINNEAPOLIS,MN 55455, USA. NR 37 TC 69 Z9 70 U1 2 U2 2 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 MAR 15 PY 1991 VL 43 IS 6 BP 2027 EP 2035 DI 10.1103/PhysRevD.43.2027 PG 9 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FC300 UT WOS:A1991FC30000034 ER PT J AU ROMERO, RPM MORENO, M ZENTELLA, A AF ROMERO, RPM MORENO, M ZENTELLA, A TI SUPERSYMMETRIC PROPERTIES AND STABILITY OF THE DIRAC SEA SO PHYSICAL REVIEW D LA English DT Article ID EQUATION AB In this work we construct a superalgebra for potential problems in the Dirac equation. We show that this superalgebra is closed for the large class of interactions that leave the Dirac sea stable. In this case, we find that it is possible to perform an exact SU(2) transformation for the Dirac Hamiltonian of the problem. This procedure is formally equivalent to obtaining an exact form for the related Foldy-Wouthuysen Hamiltonian. The potential problems that can be exactly diagonalized include the Dirac oscillator, an arbitrary, time-independent magnetic field, and all the odd potentials, as well as its non-Abelian generalizations. We find that the internal group generators do not destroy the structure of the superalgebra. We work out explicitly the example of the Dirac oscillator. C1 UNIV NACL AUTONOMA MEXICO,INST FIS,MEXICO CITY 01000,DF,MEXICO. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP ROMERO, RPM (reprint author), NATL AUTONOMOUS UNIV MEXICO,FAC CIENCIAS,DEPT FIS,APARTADO POSTAL 70-542,MEXICO CITY 04510,DF,MEXICO. NR 26 TC 29 Z9 29 U1 0 U2 2 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 MAR 15 PY 1991 VL 43 IS 6 BP 2036 EP 2040 DI 10.1103/PhysRevD.43.2036 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FC300 UT WOS:A1991FC30000035 ER PT J AU OLSON, AP AF OLSON, AP TI ENERGY-CONSERVATION SO SCIENCE LA English DT Letter RP OLSON, AP (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, 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 MAR 15 PY 1991 VL 251 IS 4999 BP 1296 EP 1296 DI 10.1126/science.251.4999.1296-a PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FB733 UT WOS:A1991FB73300003 ER PT J AU LYND, LR CUSHMAN, JH NICHOLS, RJ WYMAN, CE AF LYND, LR CUSHMAN, JH NICHOLS, RJ WYMAN, CE TI FUEL ETHANOL FROM CELLULOSIC BIOMASS SO SCIENCE LA English DT Article ID UNITED-STATES; CLOSTRIDIUM-THERMOCELLUM; SACCHAROMYCES-CEREVISIAE; GASOLINE REPLACEMENT; ENZYMATIC-HYDROLYSIS; INTENSIVE CULTURE; ENERGY; CHEMICALS; HARDWOOD; GASOHOL AB Ethanol produced from cellulosic biomass is examined as a large-scale transportation fuel. Desirable features include ethanol's fuel properties as well as benefits with respect to urban air quality, global climate change, balance of trade, and energy security. Energy balance, feed-stock supply, and environmental impact considerations are not seen as significant barriers to the widespread use of fuel ethanol derived from cellulosic biomass. Conversion economics is the key obstacle to be overcome. In light of past progress and future prospects for research-driven improvements, a cost-competitive process appears possible in a decade. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,BIOFUELS FEEDSTOCK DEV PROGRAM,OAK RIDGE,TN 37831. FORD MOTOR CO,ENVIRONM & SAFETY ENGN STAFF,DEARBORN,MI 48121. SOLAR ENERGY RES INST,BIOTECHNOL RES BRANCH,GOLDEN,CO 80401. RP LYND, LR (reprint author), DARTMOUTH COLL,THAYER SCH ENGN,HANOVER,NH 03755, USA. RI Lynd, Lee/N-1260-2013 OI Lynd, Lee/0000-0002-5642-668X NR 85 TC 558 Z9 575 U1 12 U2 143 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAR 15 PY 1991 VL 251 IS 4999 BP 1318 EP 1323 DI 10.1126/science.251.4999.1318 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FB733 UT WOS:A1991FB73300035 PM 17816186 ER PT J AU DERI, RJ THURSTON, RN HAWKINS, RJ AF DERI, RJ THURSTON, RN HAWKINS, RJ TI SCATTERING LOSSES IN SINGLE AND DOUBLE HETEROSTRUCTURE SEMICONDUCTOR OPTICAL RIB WAVE-GUIDES SO ELECTRONICS LETTERS LA English DT Article DE WAVE-GUIDES; OPTICAL WAVE-GUIDES; LOSSES ID WAVE-GUIDES AB The relative scattering losses due to rough rib sidewalls in single and double heterostructure rib waveguides are investigated theoretically. We find that double heterostructures exhibit at least as much scattering loss as single heterostructures, provided that such comparisons are made among structures with comparable bend performance. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP DERI, RJ (reprint author), BELLCORE,331 NEWMAN SPRINGS RD,RED BANK,NJ 07701, USA. NR 11 TC 4 Z9 4 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD MAR 14 PY 1991 VL 27 IS 6 BP 483 EP 484 DI 10.1049/el:19910304 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA FD312 UT WOS:A1991FD31200002 ER PT J AU JAP, BK WALIAN, PJ GEHRING, K AF JAP, BK WALIAN, PJ GEHRING, K TI STRUCTURAL ARCHITECTURE OF AN OUTER-MEMBRANE CHANNEL AS DETERMINED BY ELECTRON CRYSTALLOGRAPHY SO NATURE LA English DT Article ID ESCHERICHIA-COLI; RHODOBACTER-CAPSULATUS; SENSITIVE SPECIMENS; LIPID BILAYERS; PHOE PROTEIN; PORIN; RESOLUTION; BEAM AB PORINS are a family of membrane channels commonly found in the outer membranes of Gram-negative bacteria where they serve as diffusional pathways for waste products, nutrients and antibiotics, and can also be receptors for bacteriophages 1,2. Porin channels have been shown in vitro to be voltage-gated 3-6. They can exhibit slight selectivities for certain solutes; for example PhoE porin has some selectivity for anionic and phosphate-containing compounds 1,7. Unlike many known membrane proteins which often contain long stretches of hydrophobic segments that are believed to traverse the membrane in a helical conformation, porins are found to have charged residues distributed almost uniformly along their primary sequences and have most of their secondary structure in a beta-sheet conformation 8-10. We have made crystalline patches of PhoE porin embedded in a lipid bilayer and have used these to determine the structure of PhoE porin by electron crystallography to a resolution of 6 angstrom. The basic structure consists of a trimer of elliptically shaped, cylindrical walls of beta-sheet. Each cylinder has an inner lining, formed by parts of the polypeptide, that defines the channel size. The structure provides a clue as to how deletions of segments of polypeptide, which are found in certain mutants, can result in an actual increase in the channel size. RP JAP, BK (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DONNER LAB,BERKELEY,CA 94720, USA. RI Gehring, Kalle/I-4403-2013 OI Gehring, Kalle/0000-0001-6500-1184 NR 26 TC 127 Z9 129 U1 0 U2 5 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD MAR 14 PY 1991 VL 350 IS 6314 BP 167 EP 170 DI 10.1038/350167a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FB645 UT WOS:A1991FB64500064 PM 1848682 ER PT J AU BRANDAN, ME SATCHLER, GR AF BRANDAN, ME SATCHLER, GR TI OPTICAL-POTENTIAL AMBIGUITIES AND O-16+O-16 AT 350 MEV SO PHYSICS LETTERS B LA English DT Article ID FOLDING MODEL; SCATTERING AB The elastic scattering of O-16 + O-16 at 350 MeV has been reanalyzed using more general optical model potential shapes in an attempt to resolve the ambiguity over the order of rainbow seen in the angular distribution. We conclude that probably it is the primary rainbow, determining the real potential to have a volume integral J(v) almost-equal-to 295 +/- 5 MeV fm3. However, the use of real potentials with non-monotonic shapes defined by splines does still allow the possibility of it being the secondary rainbow generated by a deeper potential. In addition, the use of splines introduces a more shallow potential which also implies observation of the primary rainbow. C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. RP BRANDAN, ME (reprint author), UNIV NACL AUTONOMA MEXICO,INST FIS,AP POSTAL 20-364,MEXICO CITY 01000,DF,MEXICO. RI Brandan, Maria-Ester/K-9014-2012 OI Brandan, Maria-Ester/0000-0002-1165-3440 NR 11 TC 37 Z9 38 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 14 PY 1991 VL 256 IS 3-4 BP 311 EP 315 DI 10.1016/0370-2693(91)91767-P PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FC778 UT WOS:A1991FC77800004 ER PT J AU ATWOOD, D BURGESS, CP HAMZAOUI, C IRWIN, B ROBINSON, JA AF ATWOOD, D BURGESS, CP HAMZAOUI, C IRWIN, B ROBINSON, JA TI FERMION ELECTRIC-DIPOLE MOMENTS AND CP VIOLATION IN LEFT-RIGHT MODELS SO PHYSICS LETTERS B LA English DT Article ID NEUTRON; SEARCH; LIMITS AB We compute within left-right symmetric models two-loop contributions to the neutron and electron electric dipole moments. For conservative choices for the values of unknown parameters the two-loop result can be the dominant contribution and can be near the present experimental limit. We compare the size of the contributions due to quark electric- and chromoelectric moments with each other and with that from Weinberg's three-gluon operator and outline under which circumstances each gives the largest contribution. C1 MCGILL UNIV,DEPT PHYS,MONTREAL H3A 2T8,QUEBEC,CANADA. CONCORDIA UNIV,DEPT PHYS,MONTREAL H3G 1M8,QUEBEC,CANADA. RP ATWOOD, D (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 28 TC 7 Z9 7 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 MAR 14 PY 1991 VL 256 IS 3-4 BP 471 EP 476 DI 10.1016/0370-2693(91)91793-U PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FC778 UT WOS:A1991FC77800030 ER PT J AU AVIGNONE, FT BRODZINSKI, RL GUERARD, CK KIRPICHNIKOV, IV MILEY, HS POGOSOV, VS REEVES, JH STAROSTIN, AS TAMANYAN, AG AF AVIGNONE, FT BRODZINSKI, RL GUERARD, CK KIRPICHNIKOV, IV MILEY, HS POGOSOV, VS REEVES, JH STAROSTIN, AS TAMANYAN, AG TI CONFIRMATION OF THE OBSERVATION OF 2-NU BETA-BETA DECAY OF GE-76 SO PHYSICS LETTERS B LA English DT Article ID SE-82 AB Two previous independent reports of 2-nu-beta-beta-decay by the ITEP-YPI Collaboration, T1/2(2-nu) = (9 +/- 1) X 10(20) yr (1-sigma), and the PNL-USC Collaboration, T1/2(2-nu) = (1.12(-0.26)+0.48) X 10(21) yr (2-sigma), are confirmed. A 0.25 kg Ge(Li) detector, isotopically enriched to 85% in Ge-75, was operated in the PNL-USC ultralow-background facility in the Homestake gold mine. Following a single correction to the data, a spectrum resembling that observed in the earlier PNL-USC experiment, with about the same intensity per Ge-76 atom per year, was observed. The measured half-life is T1/2(2-nu) = (9.2(-0.4)+0.7) X 10(20) yr (2-sigma). C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. MOSCOW THEORET & EXPTL PHYS INST, MOSCOW 117259, USSR. YEREVAN PHYS INST, YEREVAN 375036, ARMENIA, USSR. RP AVIGNONE, FT (reprint author), UNIV S CAROLINA, COLUMBIA, SC 29208 USA. NR 18 TC 108 Z9 109 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD MAR 14 PY 1991 VL 256 IS 3-4 BP 559 EP 561 DI 10.1016/0370-2693(91)91810-I PG 3 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FC778 UT WOS:A1991FC77800047 ER PT J AU KRAMER, MJ AF KRAMER, MJ TI PROCESSING CONTROLLED STACKING-FAULTS IN YBA2CU3O7-DELTA AND THEIR EFFECT ON FLUX PINNING SO APPLIED PHYSICS LETTERS LA English DT Article ID 80-K AB There has been considerable interest in inserting controlled defects in high-temperature superconductors to enhance their flux pinning potential. One means of obtaining controlled defects in the YBa2Cu3O7-delta (Y123) structure is to decompose YBa2Cu4O8 (Y124). However, not only is the decomposition of the Y124 to optimize pinning difficult to control, sintering dense compacts of Y124 is very difficult. It is shown that the addition of 1.2 wt% CuO to Y123 sintered at 830-degrees-C results in evenly spaced 1/6[031] extrinsic stacking faults. These stacking faults have also been shown to increase pinning energy, and are stable to at least to 900-degrees-C. Intragranular J(c), as calculated from the hystersis loops, shows a significantly reduced temperature dependence at high fields. J(c) dropped only a factor of 30 from 2 X 10(6) at 10 K to 6 X 10(4) A/cm2 at 70 K at 1 T. RP KRAMER, MJ (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 13 TC 25 Z9 25 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 11 PY 1991 VL 58 IS 10 BP 1086 EP 1088 DI 10.1063/1.104379 PG 3 WC Physics, Applied SC Physics GA FA939 UT WOS:A1991FA93900032 ER PT J AU FERRARI, MJ KINGSTON, JJ WELLSTOOD, FC CLARKE, J AF FERRARI, MJ KINGSTON, JJ WELLSTOOD, FC CLARKE, J TI FLUX NOISE FROM SUPERCONDUCTING YBA2CU3O7-X FLUX TRANSFORMERS SO APPLIED PHYSICS LETTERS LA English DT Article AB Using a dc superconducting quantum interference device (SQUID) at 4.2 K, we have measured the magnitude and temperature dependence of the flux noise generated by superconducting flux transformers made from YBa2Cu3O7-x. If the transformer loop is opened, the observed noise decreases by a factor of 10, demonstrating that moving vortices generate noise primarily by altering the screening current, rather than by coupling their magnetic flux directly into the SQUID. Model calculations are given for the various noise contributions, and shown to be reasonable predictions of the observed effects. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720. RP FERRARI, MJ (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Joint Quantum Institute, NIST/UMD/H-4494-2011 NR 9 TC 59 Z9 59 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 MAR 11 PY 1991 VL 58 IS 10 BP 1106 EP 1108 DI 10.1063/1.104386 PG 3 WC Physics, Applied SC Physics GA FA939 UT WOS:A1991FA93900039 ER PT J AU BAIRD, B POSNER, R GOLDSTEIN, B HOLOWKA, D AF BAIRD, B POSNER, R GOLDSTEIN, B HOLOWKA, D TI STUDIES ON THE BINDING OF A BIVALENT LIGAND TO BIVALENT IMMUNOGLOBULIN E-RECEPTOR COMPLEXES AT THE CELL-SURFACE SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544. NR 0 TC 2 Z9 2 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A652 EP A652 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20701632 ER PT J AU CHOATE, D BLAKE, R REVIS, N AF CHOATE, D BLAKE, R REVIS, N TI CHEMICAL TRANSFORMATION OF TOXIC METALS BY A PSEUDOMONAS STRAIN FROM A TOXIC-WASTE SITE SO FASEB JOURNAL LA English DT Meeting Abstract C1 MEHARRY MED COLL,NASHVILLE,TN 37208. OAK RIDGE RES INST INC,OAK RIDGE,TN 37830. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A466 EP A466 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20700554 ER PT J AU FARKAS, WR JACOBSON, KB SIARD, T AF FARKAS, WR JACOBSON, KB SIARD, T TI QUEUINE METABOLISM AND CADMIUM TOXICITY IN DROSOPHILA SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV TENNESSEE,COLL VET MED,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A439 EP A439 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20700397 ER PT J AU GOLDSTEIN, B POSNER, RG ERICKSON, JW HOLOWKA, D BAIRD, B AF GOLDSTEIN, B POSNER, RG ERICKSON, JW HOLOWKA, D BAIRD, B TI THE IMPACT OF COMPETITION AND REBINDING ON LIGAND-RECEPTOR KINETICS SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544. CORNELL UNIV,ITHACA,NY 14853. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A651 EP A651 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20701631 ER PT J AU GRIFFIN, GD BOYARSKY, S MOUTON, M JOHNSON, R UZIEL, M VODINH, T AF GRIFFIN, GD BOYARSKY, S MOUTON, M JOHNSON, R UZIEL, M VODINH, T TI SYNCHRONOUS FLUORESCENCE DETECTION OF DNA-POLYCYCLIC HYDROCARBON ADDUCTS SO FASEB JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 1 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 MAR 11 PY 1991 VL 5 IS 4 BP A483 EP A483 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20700651 ER PT J AU HARPEL, MR LARIMER, FW MURAL, RJ HARTMAN, FC AF HARPEL, MR LARIMER, FW MURAL, RJ HARTMAN, FC TI EVALUATION OF THE ROLES OF H321 AND S368 OF R-RUBRUM RIBULOSE BISPHOSPHATE CARBOXYLASE/OXYGEN BY SITE-DIRECTED MUTAGENESIS SO FASEB JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV BIOL,PROT ENGN PROGRAM,OAK RIDGE,TN 37831. NR 3 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A826 EP A826 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20702644 ER PT J AU KOWLURU, R KOWLURU, A YAMAZAKI, A AF KOWLURU, R KOWLURU, A YAMAZAKI, A TI ALTERED ERYTHROCYTE G-PROTEIN METABOLISM IN DIABETES SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV LIFE SCI,LOS ALAMOS,NM 87544. NR 1 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A912 EP A912 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20703148 ER PT J AU LARIMER, FW SOPER, TS AF LARIMER, FW SOPER, TS TI GROE HEAT-SHOCK PROTEIN IS REQUIRED FOR INVIVO ASSEMBLY OF RECOMBINANT ANABAENA RIBULOSE BISPHOSPHATE (RU-P2) CARBOXYLASE OXYGENASE SO FASEB JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,PROT ENGN PROGRAM DIV BIOL,OAK RIDGE,TN 37831. NR 1 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A432 EP A432 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20700358 ER PT J AU LEE, EH HARTMAN, FC AF LEE, EH HARTMAN, FC TI ASSESSMENT OF THE TERMINAL PROTONATION STEP CATALYZED BY A SITE-DIRECTED MUTANT OF R-RUBRUM RIBULOSEBISPHOSPHATE CARBOXYLASE/OXYGENASE SO FASEB JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV BIOL,PROT ENGN PROGRAM,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A826 EP A826 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20702645 ER PT J AU MILANEZ, S MURAL, RJ HARTMAN, FC AF MILANEZ, S MURAL, RJ HARTMAN, FC TI EXAMINATION OF THE ROLES OF THE CYSTEINYL RESIDUES OF SPINACH PHOSPHORIBULOKINASE BY SITE-DIRECTED MUTAGENESIS SO FASEB JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV BIOL,PROT ENGN & MOLEC MUTAGENESIS PROGRAM,OAK RIDGE,TN 37831. UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE,TN 37830. NR 1 TC 0 Z9 0 U1 0 U2 1 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 MAR 11 PY 1991 VL 5 IS 4 BP A826 EP A826 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20702643 ER PT J AU SHEN, B STEVENS, F LUTHI, U AF SHEN, B STEVENS, F LUTHI, U TI ELASTICITY OF HUMAN ERYTHROCYTE SPECTRIN INFERRED FROM CONFORMATIONAL-ANALYSIS SO FASEB JOURNAL LA English DT Meeting Abstract C1 ARGONNE NATL LAB,ARGONNE,IL 60439. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A685 EP A685 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20701830 ER PT J AU UEMURA, Y LEE, TC SNYDER, F AF UEMURA, Y LEE, TC SNYDER, F TI A TRANSACYLATION REACTION INITIATES PAF BIOSYNTHESIS IN THE REMODELING PATHWAY SO FASEB JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE ASSOCIATED UNIV,DIV MED SCI,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A789 EP A789 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20702431 ER PT J AU WOYCHIK, RP BULTMAN, SJ SCHRICK, JJ MOYER, JH BEATTY, BR GODFREY, VL SELBY, PB AF WOYCHIK, RP BULTMAN, SJ SCHRICK, JJ MOYER, JH BEATTY, BR GODFREY, VL SELBY, PB TI INSERTIONAL MUTAGENESIS IN TRANSGENIC MICE SO FASEB JOURNAL LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 2 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 MAR 11 PY 1991 VL 5 IS 4 BP A783 EP A783 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20702397 ER PT J AU YASUMURA, S KIEBZAK, CM GOTHELF, T SHORT, L SPEERS, R DILMANIAN, A JONES, K SPANNE, P SCHIDLOVSKY, G GLAROS, D AF YASUMURA, S KIEBZAK, CM GOTHELF, T SHORT, L SPEERS, R DILMANIAN, A JONES, K SPANNE, P SCHIDLOVSKY, G GLAROS, D TI CHANGES IN TOTAL-BODY CALCIUM, TOTAL-BODY PHOSPHORUS, AND SKELETAL MORPHOLOGY IN THE AGING RAT SO FASEB JOURNAL LA English DT Meeting Abstract C1 SUNY HLTH SCI CTR,DEPT PHYSIOL,BROOKLYN,NY 11203. BROOKHAVEN NATL LAB,UPTON,NY 11973. NIA,GRC,BETHESDA,MD 20892. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A561 EP A561 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20701105 ER PT J AU ZABEL, V BUNICK, GJ VANDERHOFF, PA UBERBACHER, EC VOET, D AF ZABEL, V BUNICK, GJ VANDERHOFF, PA UBERBACHER, EC VOET, D TI STRUCTURE OF YEAST INORGANIC PYROPHOSPHATASE - REFINEMENT SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE,TN 37830. OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. UNIV PENN,DEPT CHEM,PHILADELPHIA,PA 19104. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A802 EP A802 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20702509 ER PT J AU SZPAK, S MOSIERBOSS, PA SMITH, JJ AF SZPAK, S MOSIERBOSS, PA SMITH, JJ TI ON THE BEHAVIOR OF PD DEPOSITED IN THE PRESENCE OF EVOLVING DEUTERIUM SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Note C1 US DOE,WASHINGTON,DC 20545. RP SZPAK, S (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 5 TC 22 Z9 22 U1 0 U2 0 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 MAR 11 PY 1991 VL 302 IS 1-2 BP 255 EP 260 DI 10.1016/0022-0728(91)85044-P PG 6 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA FE474 UT WOS:A1991FE47400017 ER PT J AU KERNAN, WJ WU, CY LIU, XT HAN, XL CLINE, D CZOSNYKA, T GUIDRY, MW HALBERT, ML JUUTINEN, S KAVKA, AE KINCAID, RW RASMUSSEN, JO SORENSEN, SP STOYER, MA VOGT, EG AF KERNAN, WJ WU, CY LIU, XT HAN, XL CLINE, D CZOSNYKA, T GUIDRY, MW HALBERT, ML JUUTINEN, S KAVKA, AE KINCAID, RW RASMUSSEN, JO SORENSEN, SP STOYER, MA VOGT, EG TI HEAVY-ION INDUCED TRANSFER-REACTIONS WITH SPHERICAL AND DEFORMED-NUCLEI SO NUCLEAR PHYSICS A LA English DT Article ID HIGH-SPIN STATES; RAY MULTIDETECTOR SYSTEM; ELASTIC NEUTRON TRANSFER; TRANSFER CROSS-SECTIONS; RESPONSE CHARACTERISTICS; SPECTROMETER-DESIGN; PAIR-TRANSFER; INSTRUMENTATION; PROBABILITIES; EXCITATION AB Cross sections for the quasielastic channels have been measured at energies slightly above the Coulomb barrier using Ni-58 and Sn-112, Sn-116 projectiles on targets of Sn-117, Sn-118 and Dy-161, Dy-162, Dy-163, Dy-164. The deexcitation gamma-rays were detected in a 4-pi NaI array (the Spin Spectrometer of Oak Ridge National Laboratory) in kinematic coincidence with both target-like and projectile-like particles; thus providing a measure of the total energy and multiplicity of the entry state. The reaction channels were identified by characteristic gamma-deexcitation transitions measured with Ge detectors substituted for array elements in the Spin Spectrometer. The angular distribution for inelastic scattering is well described by both semiclassical and quantal calculations. Two general features for few-neutron transfer channels are observed; (i) the dependence of the total cross section on the ground-state Q-value, (ii) the "coldness" of the reaction mechanism indicated by the measured entry states. For one-neutron transfer the distorted-wave Born approximation seems to give a correct overall qualitative description of the reaction mechanism for spherical nuclei, and reproduces the cross sections within a factor of two. The ground-to-ground two-neutron transfer probability for the reaction between Sn isotopes was deduced and found to be strongly enhanced (F almost-equal-to 760), which is consistent with the expectation of strong pairing correlations. Two-neutron transfer to the ground-state band in Dy was partially resolved from transfer to other intrinsic states by using the Spin Spectrometer. The oscillating radial dependence of the probability for populating the ground-state band was found to be related to the nuclear deformation. This leads to an explanation of the "slope anomaly" where the measured radial dependence of the total two-neutron transfer probability has too flat a slope compared to the prediction based on a simple binding energy argument. The probability for two-neutron transfer to the ground-state band is found to be similar to the probability for ground-to-ground transfer in the Sn + Sn system, suggesting a comparable strength for pairing correlations in the two systems. C1 UNIV ROCHESTER,NUC STRUCT RES LAB,ROCHESTER,NY 14627. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 38 TC 20 Z9 20 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 MAR 11 PY 1991 VL 524 IS 2 BP 344 EP 376 DI 10.1016/0375-9474(91)90030-A PG 33 WC Physics, Nuclear SC Physics GA FE237 UT WOS:A1991FE23700008 ER PT J AU THOMA, MH GYULASSY, M AF THOMA, MH GYULASSY, M TI QUARK DAMPING AND ENERGY-LOSS IN THE HIGH-TEMPERATURE QCD SO NUCLEAR PHYSICS B LA English DT Article ID HOT GAUGE-THEORIES; FINITE TEMPERATURE; LINEAR RESPONSE; GLUONS; PLASMA; BEHAVIOR AB The energy loss per unit length of high energy quarks in a quark-gluon plasma is calculated via PQCD. Unlike the damping rate, the energy loss is infrared finite and surprisingly small. RP THOMA, MH (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. NR 23 TC 207 Z9 207 U1 1 U2 4 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 MAR 11 PY 1991 VL 351 IS 3 BP 491 EP 506 DI 10.1016/S0550-3213(05)80031-8 PG 16 WC Physics, Particles & Fields SC Physics GA FA510 UT WOS:A1991FA51000001 ER PT J AU GOETZ, G NOTZOLD, D AF GOETZ, G NOTZOLD, D TI MICROWAVE BACKGROUND DISTORTIONS FROM DOMAIN-WALLS SO NUCLEAR PHYSICS B LA English DT Article AB Domain walls arising in a cosmic phase transition after decoupling were recently proposed as seeds for the formation of large-scale structure. The distortion induced in the microwave background radiation is calculated in dependence of the wall thickness, surface density, scalar field potential, cosmic redshift and the velocity of the wall. We find that the maximal redshift distortion for both spherical and planar walls is of the order pi-G-sigma-H0(-1), where sigma is the surface energy density and H0(-1) the Hubble parameter. We also find that, for a wall thickness smaller than the horizon, walls can be treated as infinitely thin, i.e. the redshift distortion is independent of the wall thickness and the specific form of the scalar potential. For planar walls moving with a Lorentz-factor-gamma the redshift distortion is enhanced by gamma-3. C1 FERMI NATL ACCELERATOR LAB,NASA FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. RP GOETZ, G (reprint author), UNIV CHICAGO,CTR ASTRON & ASTROPHYS,CHICAGO,IL 60637, USA. NR 10 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD MAR 11 PY 1991 VL 351 IS 3 BP 645 EP 661 DI 10.1016/S0550-3213(05)80037-9 PG 17 WC Physics, Particles & Fields SC Physics GA FA510 UT WOS:A1991FA51000007 ER PT J AU BRUNEL, LC LOUIE, SG MARTINEZ, G LABDI, S RAFFY, H AF BRUNEL, LC LOUIE, SG MARTINEZ, G LABDI, S RAFFY, H TI SUPERCONDUCTING GAP IN BI2SR2CACU2O8 SO PHYSICAL REVIEW LETTERS LA English DT Article ID CA-CU-O; REFLECTIVITY; CRYSTALS AB Reflectivity measurements, at different fixed frequencies, have been performed on Bi2Sr2CaCu2O8 films as a function of temperature and magnetic field. Analysis of the data provides evidence for an order parameter 2-DELTA(0) congruent-to 3.3k(B)T(c) although the variation of this order parameter with temperature is significantly different from that predicted by the weak-coupling BCS model. C1 UNIV PARIS 11,PHYS SOLIDES LAB,F-91405 ORSAY,FRANCE. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV MAT & MOLEC RES,BERKELEY,CA 94720. RP BRUNEL, LC (reprint author), CNRS,SERV NATL CHAMPS INTENSES,BP 166X,F-38042 GRENOBLE,FRANCE. RI LABDI, Sid/G-3265-2011 OI LABDI, Sid/0000-0003-4247-0206 NR 19 TC 42 Z9 42 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 MAR 11 PY 1991 VL 66 IS 10 BP 1346 EP 1349 DI 10.1103/PhysRevLett.66.1346 PG 4 WC Physics, Multidisciplinary SC Physics GA FA692 UT WOS:A1991FA69200025 ER PT J AU ERIKSSON, O ALBERS, RC BORING, AM AF ERIKSSON, O ALBERS, RC BORING, AM TI PREDICTION OF FERROMAGNETISM AND METAMAGNETISM IN 4D TRANSITION-METAL OVERLAYERS ON THE (001)-SURFACE OF AG (4D = TC, RU, RH, AND PD) SO PHYSICAL REVIEW LETTERS LA English DT Article ID SURFACE ELECTRONIC-STRUCTURE; MAGNETISM AB We present the first theoretical evidence for ferromagnetism in 4d overlayers on a nonmagnetic substrate. These predictions are based on ab initio, spin-polarized, electronic-structure calculations within the framework of the local-spin-density approximation. For Tc, Ru, Rh, and Pd overlayers chemisorbed on Ag(001), only Ru and Rh exhibited ferromagnetism. Several metamagnetic spin states were found for the Ru overlayers. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP ERIKSSON, O (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT SCI,LOS ALAMOS,NM 87545, USA. RI Eriksson, Olle/E-3265-2014 OI Eriksson, Olle/0000-0001-5111-1374 NR 17 TC 126 Z9 126 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 MAR 11 PY 1991 VL 66 IS 10 BP 1350 EP 1353 DI 10.1103/PhysRevLett.66.1350 PG 4 WC Physics, Multidisciplinary SC Physics GA FA692 UT WOS:A1991FA69200026 ER PT J AU LIU, JZ JIA, YX SHELTON, RN FLUSS, MJ AF LIU, JZ JIA, YX SHELTON, RN FLUSS, MJ TI INPLANE ANISOTROPY OF THE INTERACTION BETWEEN VORTEX AND TWIN BOUNDARY IN YBA2CU3O7 SINGLE-CRYSTALS SO PHYSICAL REVIEW LETTERS LA English DT Article AB We report the temperature dependence of the magnetization hysteresis loops of high-quality YBa2Cu3O7 single crystals, each with a single unique orientation of twin boundaries. We have observed magnetization anisotropy in the temperature range 6-77 K for various magnetic fields applied normal to the c axis and parallel (stronger pinning) or perpendicular (weaker pinning) to the twin-boundary orientation, thus causing an anisotropic critical current density J(c). Magnetization-time-relaxation and Meissner-fraction measurements also support the above observation. C1 UNIV CALIF 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 12 TC 54 Z9 54 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 MAR 11 PY 1991 VL 66 IS 10 BP 1354 EP 1357 DI 10.1103/PhysRevLett.66.1354 PG 4 WC Physics, Multidisciplinary SC Physics GA FA692 UT WOS:A1991FA69200027 ER PT J AU OLBRIGHT, GR FU, WS OWYOUNG, A KLEM, JF BINDER, R GALBRAITH, I KOCH, SW AF OLBRIGHT, GR FU, WS OWYOUNG, A KLEM, JF BINDER, R GALBRAITH, I KOCH, SW TI CW AND FEMTOSECOND OPTICAL NONLINEARITIES OF TYPE-II QUANTUM-WELLS SO PHYSICAL REVIEW LETTERS LA English DT Article ID SEMICONDUCTORS AB Femtosecond time-resolved and quasi-cw measurements of optical nonlinearities of type-II GaAs/AlAs quantum wells are reported. A pronounced blueshift of the heavy-hole exciton is observed, which develops on a 100-ps time scale after resonant interband excitation. The experimental observations are analyzed using many-body theory, explaining exciton blueshift and dynamical evolution in terms of electron-hole Coulomb enhancement, hole-phase-space filling, and hole-plasma cooling. C1 UNIV ARIZONA,CTR OPT SCI,TUCSON,AZ 85721. UNIV ARIZONA,DEPT PHYS,TUCSON,AZ 85721. STANFORD UNIV,SOLID STATE ELECTR LAB,STANFORD,CA 94305. RP OLBRIGHT, GR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. OI Galbraith, Ian/0000-0002-0547-7567 NR 15 TC 22 Z9 22 U1 1 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 MAR 11 PY 1991 VL 66 IS 10 BP 1358 EP 1361 DI 10.1103/PhysRevLett.66.1358 PG 4 WC Physics, Multidisciplinary SC Physics GA FA692 UT WOS:A1991FA69200028 ER PT J AU WU, CL FENG, DH GUIDRY, MW AF WU, CL FENG, DH GUIDRY, MW TI SPIN ALIGNMENT IN SUPERDEFORMED HG NUCLEI - COMMENT SO PHYSICAL REVIEW LETTERS LA English DT Letter C1 UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,JOINT INST HEAVY ION RES,OAK RIDGE,TN 37835. RP WU, CL (reprint author), DREXEL UNIV,DEPT PHYS & ATMOSPHER SCI,PHILADELPHIA,PA 19104, USA. NR 4 TC 21 Z9 29 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 11 PY 1991 VL 66 IS 10 BP 1377 EP 1377 DI 10.1103/PhysRevLett.66.1377 PG 1 WC Physics, Multidisciplinary SC Physics GA FA692 UT WOS:A1991FA69200035 ER PT J AU STEPHENS, FS DELEPLANQUE, MA KORTEN, W DIAMOND, RM AZAIEZ, F MACCHIAVELLI, AO BECKER, JA HENRY, EA KUHNERT, A DRAPER, JE CIZEWSKI, JA BRINKMAN, MJ AF STEPHENS, FS DELEPLANQUE, MA KORTEN, W DIAMOND, RM AZAIEZ, F MACCHIAVELLI, AO BECKER, JA HENRY, EA KUHNERT, A DRAPER, JE CIZEWSKI, JA BRINKMAN, MJ TI SPIN ALIGNMENT IN SUPERDEFORMED HG NUCLEI - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Letter C1 UNIV CALIF DAVIS,DAVIS,CA 95616. RUTGERS STATE UNIV,NEW BRUNSWICK,NJ 08903. RP STEPHENS, FS (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. RI KORTEN, Wolfram/H-3043-2013 NR 6 TC 8 Z9 8 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 11 PY 1991 VL 66 IS 10 BP 1378 EP 1378 DI 10.1103/PhysRevLett.66.1378 PG 1 WC Physics, Multidisciplinary SC Physics GA FA692 UT WOS:A1991FA69200036 ER PT J AU DERMER, CD LIANG, EP CANFIELD, E AF DERMER, CD LIANG, EP CANFIELD, E TI LUMINOSITY ENHANCEMENT FACTOR FOR THERMAL COMPTONIZATION AND THE ELECTRON-ENERGY BALANCE SO ASTROPHYSICAL JOURNAL LA English DT Article DE PLASMAS; RADIATION MECHANISMS ID ACTIVE GALACTIC NUCLEI; PAIR-EQUILIBRIUM; RELATIVISTIC PLASMAS; ASTROPHYSICAL PLASMAS; MAGNETIC-FIELDS; X-RAYS; SPECTRA; EMISSION; RATES AB Comptonization of soft photons by hot thermal electrons is an important cooling mechanism governing the electron energy balance in astrophysical plasmas. We treat thermal Comptonization in terms of the luminosity enhancement factor-eta, which gives the average change in energy of a photon between injection into and escape from a scattering medium. The region in which the photon scatters is characterized by the dimensionless electron temperature-theta = k(T)/m(e)C2, Thomson depth tau-T, and geometry. We derive an approximate expression for eta given by [GRAPHICS] where P = 1 - exp (-tau-T), A = 1 + 4-theta + 16-theta-2, and chi = hv/m(e)c2 is the photon energy at injection. Equation (1), with tau-T replaced by an effective scattering depth tau-eff(theta, tau-T), is used to fit Monte Carlo results for eta at relativistic temperatures in three geometries: a point source of photons located at the center of a sphere; a uniform source of photons distributed throughout the volume of a sphere; and a uniform source of photons distributed throughout the volume of a disk. Equation (1) also provides a good approximation to the nonrelativistic luminosity enhancement factor in the diffusion regime when - ln P/ln A is identified with the nonrelativistic photon spectral index-alpha derived by Sunyaev and Titarchuk. Integration of equation (1) over the bremsstrahlung source term provides a generalization of the result derived by Kompaneets for the enhancement of energy-loss rate of thermal electrons due to Comptonization of internally produced bremsstrahlung photons. Expressions for the electron energy-loss rate due to Comptonization of thermal cyclosynchrotron photons and nonthermal soft photons are also derived. C1 UNIV CALIF BERKELEY,BERKELEY SPACE SCI LAB,BERKELEY,CA 94720. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550. NR 37 TC 52 Z9 52 U1 1 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAR 10 PY 1991 VL 369 IS 2 BP 410 EP 421 DI 10.1086/169770 PN 1 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA EY637 UT WOS:A1991EY63700012 ER PT J AU NOFAR, I SHAVIV, G STARRFIELD, S AF NOFAR, I SHAVIV, G STARRFIELD, S TI THE FORMATION OF AL-26 IN NOVA EXPLOSIONS SO ASTROPHYSICAL JOURNAL LA English DT Article DE NUCLEOSYNTHESIS; STARS NOVAE ID THERMONUCLEAR REACTION-RATES; ACCRETING WHITE-DWARFS; INTERSTELLAR-MEDIUM; CNO ABUNDANCES; NE-E; NUCLEOSYNTHESIS; OUTBURSTS; TEMPERATURES; MAGNESIUM; EVOLUTION AB The amount of Al-26 in the interstellar medium, which has been detected both by the HEAO 3 gamma-ray spectrometer and the SMM experiment, in combination with the measured overabundance of Mg-26 in meteorites, is predicted to have been produced by nucleosynthesis in nova explosions. To test this prediction, we have investigated the nucleosynthesis of Al-26 during hot hydrogen burning along temperature-density-time profiles obtained from hydrodynamic simulations of nova outbursts. We find that we can predict the yield of Al-26 if we characterize the thermonuclear runaway by means of two parameters: (1) the peak temperature and (2) the time required by the nova to reach peak temperature. We provide yields of Al-26 in terms of these parameters. We have also found that the yield of Al-26 is directly proportional to the abundances of the heavy elements so that about 20% of the initial Mg-24 is converted into Al-26. Therefore, we are also able to show that the dominant contributor of Al-26 to the Galaxy must be novae which occur on oxygen-neon-magnesium white dwarfs. However, we also find that the class of novae that should be the most important contributors to Galactic nucleosynthesis of Al-26 may not have been discovered but must exist. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87544. TECHNION ISRAEL INST TECHNOL,SPACE RES INST,IL-32000 HAIFA,ISRAEL. ARIZONA STATE UNIV,DEPT PHYS & ASTRON 1504,TEMPE,AZ 85287. RP NOFAR, I (reprint author), TECHNION ISRAEL INST TECHNOL,DEPT PHYS,IL-32000 HAIFA,ISRAEL. NR 37 TC 57 Z9 57 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 MAR 10 PY 1991 VL 369 IS 2 BP 440 EP 450 DI 10.1086/169772 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA EY637 UT WOS:A1991EY63700014 ER PT J AU THOMPSON, ME AF THOMPSON, ME TI NUMERICAL-SIMULATION OF SOLUTE TRANSPORT IN ROUGH FRACTURES SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS LA English DT Article ID CONTAMINANT TRANSPORT; TRACER TRANSPORT; SINGLE FRACTURE; FISSURED ROCK; CHANNEL MODEL; POROUS-MEDIA; FLOW; DISPERSION; DIFFUSION; SURFACES AB Parallel plate models are inadequate to describe the hydraulic and transport properties of natural fractures with rough surfaces. A two-dimensional numerical simulation of flow and solute migration in a fracture with fractal surfaces is presented. The macroscopic transport properties of the fractures are derived by comparison of the numerical simulations to predictions of a one-dimensional advection dispersion model. This makes it possible to determine effective dispersivities and solute velocities for the mathematically generated surfaces. The effects of adsorption, travel distance and channeling phenomena on the transport properties are examined. The modeling indicates that the effective velocity of the solute differs from that of the average fluid particle due to transverse and longitudinal dispersion and diffusion. These conclusions agree with field measurements of flow and transport in fractures. RP THOMPSON, ME (reprint author), SANDIA NATL LABS,GEOCHEM DIV 6233,ALBUQUERQUE,NM 87185, USA. NR 34 TC 29 Z9 31 U1 0 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-SOLID PD MAR 10 PY 1991 VL 96 IS B3 BP 4157 EP 4166 DI 10.1029/90JB02385 PG 10 WC Geosciences, Multidisciplinary SC Geology GA FB313 UT WOS:A1991FB31300021 ER PT J AU ZOUBOULIS, ES GRIMSDITCH, M AF ZOUBOULIS, ES GRIMSDITCH, M TI REFRACTIVE-INDEX AND ELASTIC PROPERTIES OF MGO UP TO 1900-K SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS LA English DT Article ID SINGLE-CRYSTAL MGO; CONSTANTS AB The refractive index and elastic constants of MgO have been measured up to 1900 K using Brillouin scattering. The refractive index shows a monotonic increase with temperature. Our elastic constant measurements slightly extend the temperature range previously covered in ultrasonic and resonance experiments; although overall agreement is good, small differences exist between the different determinations. RP ZOUBOULIS, ES (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,BLDG 223,ARGONNE,IL 60439, USA. NR 18 TC 16 Z9 17 U1 2 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-SOLID PD MAR 10 PY 1991 VL 96 IS B3 BP 4167 EP 4170 DI 10.1029/90JB02726 PG 4 WC Geosciences, Multidisciplinary SC Geology GA FB313 UT WOS:A1991FB31300022 ER PT J AU CHUANG, SSC PIEN, SI GHOSAL, K SOONG, Y NOCETI, RP SCHEHL, RR AF CHUANG, SSC PIEN, SI GHOSAL, K SOONG, Y NOCETI, RP SCHEHL, RR TI CARBON-MONOXIDE HYDROGENATION OVER NA-MN-NI CATALYSTS - EFFECTS OF CATALYST PREPARATION METHODS ON THE C2+ OXYGENATE SELECTIVITY SO APPLIED CATALYSIS LA English DT Article DE CARBON MONOXIDE HYDROGENATION; OXYGENATES; ACETALDEHYDE CATALYST PREPARATION (COPRECIPITATION; WET IMPREGNATION); CATALYST CHARACTERIZATION (TPD; XRD); SODIUM MANGANESE NICKEL; MANGANESE NICKEL; NICKEL ID METAL-SUPPORT INTERACTION; SYNTHESIS GAS; MECHANISM; ALCOHOLS; PROMOTER; SYNGAS; IRON AB The effect of catalyst preparation methods on carbon monoxide hydrogenation selectivity over Na-Mn-Ni catalysts has been studied. The SiO2-supported Ni and Mn-Ni catalysts prepared from impregnation exhibited high methanation and hydrocarbon synthesis selectivity. The Mn-Ni catalysts prepared from coprecipitation of manganese and nickel nitrates with sodium carbonate showed high selectivity for C2+ oxygenate synthesis. Temperature-programmed desorption studies revealed that hydrogen chemisorption on the coprecipitated catalysts was highly activated. The results suggest that highly activated hydrogen chemisorption may lead to a hydrogen-deficient surface which would favor carbon monoxide insertion relative to hydrogenation. C1 US DOE, PITTSBURGH ENERGY TECHNOL CTR, PITTSBURGH, PA 15236 USA. RP CHUANG, SSC (reprint author), UNIV AKRON, DEPT CHEM ENGN, AKRON, OH 44325 USA. NR 31 TC 4 Z9 4 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-9834 J9 APPL CATAL PD MAR 7 PY 1991 VL 70 IS 1 BP 101 EP 114 PG 14 WC Chemistry, Physical SC Chemistry GA FC987 UT WOS:A1991FC98700011 ER PT J AU CLOSS, GL FORBES, MDE AF CLOSS, GL FORBES, MDE TI EPR SPECTROSCOPY OF ELECTRON-SPIN POLARIZED BIRADICALS IN LIQUID SOLUTIONS - TECHNIQUE, SPECTRAL SIMULATION, SCOPE, AND LIMITATIONS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID RADICAL PAIRS; RESONANCE; DYNAMICS; CHAINS; PHOTOCHEMISTRY; CIDNP AB Application of the time-resolved EPR technique to the study of unstable organic biradicals in liquid solution is described. Results for a homologous series of polymethylene chain biradicals, produced by laser flash photolysis of cyclic ketones, are presented as experimental examples. To account for the shape and decay of the spectra with time, two models for the EPR spectra are put forward. The first uses a perturbation theory approximation for the eigenvectors, eigenvalues, and populations of the states, and then applies kinetic decay rate constants for nuclear spin dependent chemical reaction and spin relaxation. The second method shows how symmetry factoring the nuclear basis allows the block diagonalization of the spin Hamiltonian, so that the eigenvalue problem, even for 16 hyperfine interactions, can be solved exactly. A comparison of the two models shows that the perturbation treatment is adequate for most cases. The shape and time dependence of the EPR spectra for both acyl-alkyl and bis(alkyl) polymethylene biradicals are simulated and good agreement with experiment is obtained. The electronic spin-spin coupling interaction, J, and the end-to-end contact rate of the chains, k(r), are extracted from the simulations for each chain length. The lifetimes are 1-2-mu-s for the bis(alkyl) biradicals and about 0.5-mu-s for the acyl-alkyl species. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP CLOSS, GL (reprint author), UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637, USA. NR 42 TC 71 Z9 72 U1 2 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAR 7 PY 1991 VL 95 IS 5 BP 1924 EP 1933 DI 10.1021/j100158a009 PG 10 WC Chemistry, Physical SC Chemistry GA FA621 UT WOS:A1991FA62100009 ER PT J AU SCHOONOVER, JR DALLINGER, RF KILLOUGH, PM SATTELBERGER, AP WOODRUFF, WH AF SCHOONOVER, JR DALLINGER, RF KILLOUGH, PM SATTELBERGER, AP WOODRUFF, WH TI TIME-RESOLVED RESONANCE RAMAN-STUDY OF THE DELTA-DELTA-STAR EXCITED-STATE OF RE2CL82- AND RE2BR82- SO INORGANIC CHEMISTRY LA English DT Article ID METAL-METAL INTERACTIONS; ELECTRONIC STATES; BINUCLEAR COMPLEXES; SPECTRA; SPECTROSCOPY; OCTACHLORODIRHENATE(III); OCTAFLUORODIRHENATE(III); OCTABROMODIRHENATE(III); ABSORPTION; ASSIGNMENT AB Time-resolved resonance Raman (TR3) spectra have been obtained for Re2X8(2-) (X = Cl, Br) in the 1A2u (sigma-sigma*) electronically excited state, at ambient temperature in solution. The TR3 spectra exhibit Raman peaks that are assigned to the three symmetric vibrations of the excited state: the Re-Re stretch, Re-X stretch, and the Re-Re-X deformation. In addition, a depolarized peak attributed to an asymmetric X-Re-X bend is observed. Comparison of the TR3 results to single-crystal vibronic spectra reported by others clearly shows the effects of crystal constraints and observation time scale upon the structure of the sigma-sigma excited state. The excited-state metal-metal bond distance is inferred to be 0.03-0.04 angstrom shorter in solution than in the crystal. The TR3 data, obtained in solution on the nanosecond time scale, indicate that the excited state relaxes to a staggered molecular structure (D4 or D4d symmetry). The vibronic data, obtained on single crystals under cryogenic conditions, are consistent with an eclipsed (D4h) structure, similar to that of the ground state. A comparative TR3 study of quadruply bonded complexes, including both octahalodirhenate ions and Mo2(PMe3)4Cl4 (which is precluded by steric factors from significant torsional distortion about the metal-metal bond), was essential in elucidating the excited-state structures. C1 UNIV CALIF LOS ALAMOS SCI LAB,ISOTOPE & STRUCT CHEM GRP,INC-4,LOS ALAMOS,NM 87545. NR 22 TC 12 Z9 12 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD MAR 6 PY 1991 VL 30 IS 5 BP 1093 EP 1098 DI 10.1021/ic00005a039 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA FA587 UT WOS:A1991FA58700039 ER PT J AU STEFFAN, CR ESPENSON, JH BAKAC, A AF STEFFAN, CR ESPENSON, JH BAKAC, A TI OXIDATIVE HOMOLYSIS OF ORGANOCHROMIUM MACROCYCLES SO INORGANIC CHEMISTRY LA English DT Article ID ELECTRON-TRANSFER PROCESSES; PARAMAGNETIC RESONANCE-SPECTRA; BENZYL COBALOXIMES; PHOTOELECTRON-SPECTROSCOPY; ELECTROCHEMICAL OXIDATION; ORGANOMETALLIC COMPLEXES; EXCITED-STATE; COBALT BONDS; CLEAVAGE; MECHANISM AB The complexes RCrL(H2O)2+ (R = alkyl, aralkyl; L = 1,4,8,12-tetraazacyclopentadecane) are oxidized by Ru(bpy)3(3+) and 2E Cr(bpy)3(3+). The one-electron oxidized species RCrL(H2O)3+ undergoes subsequent homolysis; the R. radicals so produced may react with certain metal complexes, or they dimerize, depending on conditions. The rate constants for the rate-controlling step, electron transfer from RCrL(H2O)2+ to Ru(bpy)3(3+) or *Cr(bpy)3(3+), were measured by laser flash photolysis for an extensive range of R groups. For Ru(bpy)3(3+), the rate constants range from 14.2 L mol-1 s-1 (R = CH3) to 1.05 x 10(9) (R = 4-CH3C6H4CH2); for *Cr(bpy)3(3+), the corresponding values are 2.8 x 10(6) and 1.55 x 10(9) L mol-1 s-1. In both series, the order of rate constants is methyl < primary alkyl < secondary alkyl < aralkyl. The plots of log k versus the gas-phase ionization potentials of R. are linear, in accord with the rate-controlling step being electron transfer. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 53 TC 3 Z9 3 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD MAR 6 PY 1991 VL 30 IS 5 BP 1134 EP 1137 DI 10.1021/ic00005a046 PG 4 WC Chemistry, Inorganic & Nuclear SC Chemistry GA FA587 UT WOS:A1991FA58700046 ER PT J AU POSNER, RG ERICKSON, JW HOLOWKA, D BAIRD, B GOLDSTEIN, B AF POSNER, RG ERICKSON, JW HOLOWKA, D BAIRD, B GOLDSTEIN, B TI DISSOCIATION KINETICS OF BIVALENT LIGAND IMMUNOGLOBULIN-E AGGREGATES IN SOLUTION SO BIOCHEMISTRY LA English DT Article ID IGE-RECEPTOR COMPLEXES; CELL-SURFACE RECEPTORS; CROSS-LINKING; BINDING; HAPTENS AB We study the dissociation of preformed bivalent ligand-bivalent receptor aggregates in solution, where the ligand is a symmetric bivalent hapten with two identical 2,4-dinitrophenyl (DNP) groups and the receptor is a fluorescein-labeled monoclonal anti-DNP IgE. We promote dissociation in two ways: by the addition of high concentrations of a monovalent hapten that competes for IgE binding sites with the bivalent hapten and by the addition of high concentrations of unlabeled IgE that binds almost all ligand binding sites that dissociate from labeled IgE. We investigate both theoretically and experimentally the two types of dissociation and find them to be quite different. Theory predicts that their kinetics will depend differently on the fundamental rate constants that characterize binding and aggregation. Using monovalent ligand to promote dissociation, we find that the fraction of labeled IgE sites bound to bivalent ligand decays with a slow and fast component. The fast decay corresponds to the dissociation of a singly bound DNP hapten. The interpretation of the slow decay depends on the detailed way in which ligand-receptor aggregates break up. We show that one possible explanation of these data is that small stable rings form before the addition of monovalent ligand. Other possible explanations are also presented. C1 CORNELL UNIV,BAKER LAB,DEPT CHEM,ITHACA,NY 14853. UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,THEORET BIOL & BIOPHYS GRP,LOS ALAMOS,NM 87545. FU NIAID NIH HHS [AI22449]; NIGMS NIH HHS [GM07273, GM35556] NR 14 TC 26 Z9 26 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD MAR 5 PY 1991 VL 30 IS 9 BP 2348 EP 2356 DI 10.1021/bi00223a008 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FA348 UT WOS:A1991FA34800008 PM 1900432 ER PT J AU ERICKSON, JW POSNER, RG GOLDSTEIN, B HOLOWKA, D BAIRD, B AF ERICKSON, JW POSNER, RG GOLDSTEIN, B HOLOWKA, D BAIRD, B TI BIVALENT LIGAND DISSOCIATION KINETICS FROM RECEPTOR-BOUND IMMUNOGLOBULIN-E - EVIDENCE FOR A TIME-DEPENDENT INCREASE IN LIGAND REBINDING AT THE CELL-SURFACE SO BIOCHEMISTRY LA English DT Article ID BASOPHILIC LEUKEMIA-CELLS; SMALL OLIGOMERS; CROSS-LINKING; MAST-CELLS; IGE; COMPLEXES; ANTIBODY; RELEASE; HAPTEN AB The bivalent ligand N,N'-bis[[epsilon-[(2,4-dinitrophenyl)amino]caproyl]-L-tyrosyl]cystine [(DCT)2-Cys] binds and cross-links anti-dinitrophenyl (DNP) immunoglobulin E (IgE)-receptor complexes on the cell surface of rat basophilic leukemia cells. The rate of dissociation of this bound ligand was monitored by using a fluorescence method under two different conditions. In one case the monovalent ligand DCT was added in large excess to prevent the dissociating ligand from rebinding to unoccupied antibody combining sites. Under these conditions, dissociation of the bivalent ligand from IgE-sensitized cells proceeds to completion with kinetics that are well described by two rate constants that are independent of the time of preincubation of the bivalent ligand with the cells. In the second case, dissociation of (DCT)2-Cys from cell-bound anti-DNP IgE was monitored in the presence of a large excess of anti-DNP IgE in solution that acts as a sink to absorb the dissociated ligand. Under these conditions, the bivalent ligand becomes more resistant to dissociation as the preincubation time of the bivalent ligand with the cells is increased. An increasing fraction of the bound ligand does not dissociate on a measurable time scale in the presence of this sink. The results indicate that cell-associated IgE-receptor complexes undergo a time-dependent change that facilitates the reformation of the cross-linked state when one end of the ligand dissociates to break up the existing cross-link. The possible physical basis and functional implications of these results are discussed. C1 CORNELL UNIV,BAKER LAB,DEPT CHEM,ITHACA,NY 14853. UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,THEORET BIOL & BIOPHYS GRP,LOS ALAMOS,NM 87545. FU NIAID NIH HHS [AI22449]; NIGMS NIH HHS [GM07273, GM35556] NR 22 TC 34 Z9 34 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD MAR 5 PY 1991 VL 30 IS 9 BP 2357 EP 2363 DI 10.1021/bi00223a009 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FA348 UT WOS:A1991FA34800009 PM 1825785 ER PT J AU GOURLEY, PL WARREN, ME HADLEY, GR VAWTER, GA BRENNAN, TM HAMMONS, BE AF GOURLEY, PL WARREN, ME HADLEY, GR VAWTER, GA BRENNAN, TM HAMMONS, BE TI COHERENT BEAMS FROM HIGH-EFFICIENCY 2-DIMENSIONAL SURFACE-EMITTING SEMICONDUCTOR-LASER ARRAYS SO APPLIED PHYSICS LETTERS LA English DT Article AB We have fabricated and operated large two-dimensional (2D) arrays of phase-locked surface-emitting semiconductor lasers. The arrays were fabricated by reactive ion beam etching of epitaxial Fabry-Perot resonators comprising GaAs/AlGaAs quantum wells surrounded by AlAs-AlGaAs quarter-wave mirrors. Different arrays corresponding to different pixel size (2-5-mu-m) and spacing (1-2-mu-m) were produced to investigate evanescent coupling between pixels. The arrays were photopumped so that the array size could be conveniently varied from 1 x 1, 2 x 2,... up to 20 x 20. Except for the 1 x 1 which emits a circular pattern, all arrays exhibit a well-defined four-lobed far-field pattern in agreement with our theoretical analysis of the optical modes which predicts domination by the 2D out-of-phase eigenmode. As a consequence this pattern can be understood with simple Fraunhofer diffraction theory. The angular spread of the lobes, determined by the periodicity of the array elements, is 10-degrees for the array with element size/spacing of 4/1-mu-m. The widths of the lobes are 6.7-degrees for the 2 x 2 and narrow to 3.2-degrees with increasing number of pixels in the array. The array exhibits a sharp onset for lasing, operation on a single longitudinal mode, and a linewidth which narrows to approximately 1 angstrom with increasing array size. The differential power efficiency is as high as 70%. These observations provide further impetus and guidance for the development of 2D laser diode arrays. RP GOURLEY, PL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 6 TC 71 Z9 71 U1 0 U2 5 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 MAR 4 PY 1991 VL 58 IS 9 BP 890 EP 892 DI 10.1063/1.104468 PG 3 WC Physics, Applied SC Physics GA FA938 UT WOS:A1991FA93800005 ER PT J AU ZAHOPOULOS, C SRIDHAR, S BAUTISTA, JJ ORTIZ, G LANAGAN, M AF ZAHOPOULOS, C SRIDHAR, S BAUTISTA, JJ ORTIZ, G LANAGAN, M TI PERFORMANCE OF A HIGH-TC SUPERCONDUCTING ULTRALOW-LOSS MICROWAVE STRIPLINE FILTER SO APPLIED PHYSICS LETTERS LA English DT Article AB We report the successful fabrication of a five-pole interdigital stripline filter made of the 93 K superconductor Y1Ba2Cu3O(y) coated on a silver substrate, with a center frequency of 8.5 GHz and an extremely high rejection ratio of 80 dB. The lowest insertion loss measured was 0.1 dB at 12 K, with a return loss better than 16 dB, representing significant improvements over a similar Cu filter, and comparable to low T(c) filters. The insertion loss appears to be limited by extrinsic factors such as tuning mismatch and joint losses, and not by the superconducting material losses. C1 CALTECH,JET PROP LAB,PASADENA,CA 91109. ARGONNE NATL LAB,ARGONNE,IL 60439. RP ZAHOPOULOS, C (reprint author), NORTHEASTERN UNIV,DEPT PHYS,BOSTON,MA 02115, USA. RI Sridhar, Srinivas/A-3688-2012 NR 9 TC 14 Z9 14 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 4 PY 1991 VL 58 IS 9 BP 977 EP 979 DI 10.1063/1.104461 PG 3 WC Physics, Applied SC Physics GA FA938 UT WOS:A1991FA93800035 ER PT J AU BUEHRER, W ALTORFER, F MESOT, J BILL, H CARRON, P SMITH, HG AF BUEHRER, W ALTORFER, F MESOT, J BILL, H CARRON, P SMITH, HG TI LATTICE-DYNAMICS AND THE DIFFUSE PHASE-TRANSITION OF LITHIUM SULFIDE INVESTIGATED BY COHERENT NEUTRON-SCATTERING SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID ANION DISORDER AB Elastic neutron diffraction of Li2S, measured as a function of temperature, shows the onset of a diffuse phase transition near 900 K to a highly conducting state. Inelastic neutron scattering has been used to investigate the harmonic lattice dynamics of Li2S at 15 K. A shell model has been successfully fitted to the data. The dynamical properties are computed within the harmonic approximation and compared with experimental data. C1 DEPT CHIM PHYS SCI 2,CH-1211 GENEVA 4,SWITZERLAND. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37830. RP BUEHRER, W (reprint author), ETH ZENTRUM,LABOR NEUTRONENSTREUUNG,CH-5232 VILLIGEN,SWITZERLAND. NR 17 TC 22 Z9 23 U1 0 U2 6 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD MAR 4 PY 1991 VL 3 IS 9 BP 1055 EP 1064 DI 10.1088/0953-8984/3/9/002 PG 10 WC Physics, Condensed Matter SC Physics GA FB076 UT WOS:A1991FB07600002 ER PT J AU CHRIEN, RE AF CHRIEN, RE TI PALEVSKY,H. (1919-1990) SO NUCLEAR PHYSICS A LA English DT Item About an Individual RP CHRIEN, RE (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 4 PY 1991 VL 524 IS 1 BP R1 EP R2 DI 10.1016/0375-9474(91)90013-V PG 2 WC Physics, Nuclear SC Physics GA FC660 UT WOS:A1991FC66000001 ER PT J AU CLEVELAND, MG PRITCHETT, T ALBERTIN, UK AF CLEVELAND, MG PRITCHETT, T ALBERTIN, UK TI A SUPERSYMMETRIC THEORY OF EVEN-RANK ANTISYMMETRIC TENSOR-FIELDS SO NUCLEAR PHYSICS B LA English DT Article ID ATIYAH-SINGER INDEX; ANOMALIES; BREAKING; TORSION AB We present a theory of rank-2k antisymmetric tensor fields (or equivalently, of differential 2k-forms) on a world-surface of dimension 4k + 1. In addition to gauge symmetries, the theory exhibits an unconventional supersymmetry. We examine the unusual interplay between these two types of symmetries in the process of gauge fixing. We interpret the gauge-fixed supercharge as a Dirac operator on an appropriate coset space of differential forms; in particular, the k = 1 theory yields the Dirac operator on the space of two-forms modulo exact two-forms on a manifold of dimension 4. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP CLEVELAND, MG (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 24 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD MAR 4 PY 1991 VL 351 IS 1-2 BP 298 EP 312 DI 10.1016/0550-3213(91)90092-C PG 15 WC Physics, Particles & Fields SC Physics GA EX572 UT WOS:A1991EX57200013 ER PT J AU HALPERN, MB YAMRON, JP AF HALPERN, MB YAMRON, JP TI A GENERIC AFFINE-VIRASORO ACTION SO NUCLEAR PHYSICS B LA English DT Article ID WESS-ZUMINO MODEL; 2 DIMENSIONS; QUANTUM GEOMETRY; CONSTRUCTION; STRINGS AB A Weyl, diffeomorphism, and (rigidly) conformal invariant affine-Virasoro action is obtained for the generic high-k smooth affine-Virasoro construction, including the new unitary irrational constructions on affine compact g. The action of the generic theory L is gauged by its commuting K-conjugate theory LBAR, which gives new representations of DiffS2 on group manifolds and new embeddings of DiffS2 in (classical) affine G X G. Chiral copies of (classical) affine g reside in a special gauge. We also begin construction of the gauge-invariant observables of the generic theory. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. SUNY STONY BROOK,INST THEORET PHYS,STONY BROOK,NY 11794. RP HALPERN, MB (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 29 TC 27 Z9 27 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 MAR 4 PY 1991 VL 351 IS 1-2 BP 333 EP 352 DI 10.1016/0550-3213(91)90094-E PG 20 WC Physics, Particles & Fields SC Physics GA EX572 UT WOS:A1991EX57200015 ER PT J AU PERES, A WOOTTERS, WK AF PERES, A WOOTTERS, WK TI OPTIMAL DETECTION OF QUANTUM INFORMATION SO PHYSICAL REVIEW LETTERS LA English DT Article AB Two quantum systems are identically prepared in different locations. An observer's task is to determine their state. A simple example shows that a pair of measurements of the von Neumann type is less effective than a sequence of nonorthogonal probability-operator measures, alternating between the two quantum systems. However, the most efficient set of operations of that type that we were able to design falls short of a single combined measurement, performed on both systems together. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. TECHNION ISRAEL INST TECHNOL,DEPT PHYS,HAIFA,ISRAEL. WILLIAMS COLL,DEPT PHYS,WILLIAMSTOWN,MA 01267. UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP PERES, A (reprint author), SANTA FE INST,1120 CANYON RD,SANTA FE,NM 87501, USA. NR 16 TC 177 Z9 178 U1 1 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 4 PY 1991 VL 66 IS 9 BP 1119 EP 1122 DI 10.1103/PhysRevLett.66.1119 PG 4 WC Physics, Multidisciplinary SC Physics GA FA349 UT WOS:A1991FA34900004 ER PT J AU BIGOT, JY PORTELLA, MT SCHOENLEIN, RW BARDEEN, CJ MIGUS, A SHANK, CV AF BIGOT, JY PORTELLA, MT SCHOENLEIN, RW BARDEEN, CJ MIGUS, A SHANK, CV TI NON-MARKOVIAN DEPHASING OF MOLECULES IN SOLUTION MEASURED WITH 3-PULSE FEMTOSECOND PHOTON-ECHOES SO PHYSICAL REVIEW LETTERS LA English DT Article ID SCATTERING; RAMAN AB The electronic dephasing of large molecules in solution is investigated with three-pulse photon echoes generated by 6-fs optical pulses. The observed dephasing behavior, which is analyzed with a model based on a stochastic coupling of the molecules with their heat bath, is clearly shown to be non-Markovian. Moreover, the correlation function of the fluctuations asymptotically approaches an exponential with characteristic times varying from 20 to 80 fs, depending on the solvent environment. C1 ECOLE POLYTECH,ECOLE NORMALE SUPER TECH AVANCEES,OPT APPL LAB,F-91120 PALAISEAU,FRANCE. RP BIGOT, JY (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,1 CYCLOTRON RD,MS 50A-4133,BERKELEY,CA 94720, USA. RI Schoenlein, Robert/D-1301-2014 OI Schoenlein, Robert/0000-0002-6066-7566 NR 18 TC 166 Z9 166 U1 1 U2 11 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 MAR 4 PY 1991 VL 66 IS 9 BP 1138 EP 1141 DI 10.1103/PhysRevLett.66.1138 PG 4 WC Physics, Multidisciplinary SC Physics GA FA349 UT WOS:A1991FA34900009 ER PT J AU COWAN, TE BENNETT, CL DIETRICH, DD BIXLER, JV HAILEY, CJ HENDERSON, JR KNAPP, DA LEVINE, MA MARRS, RE SCHNEIDER, MB AF COWAN, TE BENNETT, CL DIETRICH, DD BIXLER, JV HAILEY, CJ HENDERSON, JR KNAPP, DA LEVINE, MA MARRS, RE SCHNEIDER, MB TI PRECISION-MEASUREMENT OF THE 3S1/2-3P3/2 TRANSITION ENERGY IN NA-LIKE PLATINUM IONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID PERTURBATION-THEORY CALCULATIONS; ISOELECTRONIC SEQUENCE AB We report a measurement of the 3s(1/2)-3p3/2 transition energy in Na-like 78Pt67+ ions of 653.44 +/- 0.02(stat) +/- 0.05(syst) eV. The x rays were observed from ions in an electron-beam ion trap. The uncertainty in our result corresponds to 1% of the total estimated quantum electrodynamic radiative contribution to this transition energy. This value differs significantly from extrapolations based on previous lower-Z data, and establishes a benchmark for calculations of high-Z multielectron radiative and relativistic effects. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP COWAN, TE (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. RI Cowan, Thomas/A-8713-2011 OI Cowan, Thomas/0000-0002-5845-000X NR 13 TC 47 Z9 47 U1 2 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 4 PY 1991 VL 66 IS 9 BP 1150 EP 1153 DI 10.1103/PhysRevLett.66.1150 PG 4 WC Physics, Multidisciplinary SC Physics GA FA349 UT WOS:A1991FA34900012 ER PT J AU MYRA, JR DIPPOLITO, DA FORSLUND, DW BRACKBILL, JU AF MYRA, JR DIPPOLITO, DA FORSLUND, DW BRACKBILL, JU TI SHEATH-PLASMA WAVES AND ANOMALOUS LOADING IN ION-BERNSTEIN-WAVE EXPERIMENTS SO PHYSICAL REVIEW LETTERS LA English DT Article ID TOKAMAK; INSTABILITY; RESONANCE; ANTENNAS AB It is proposed that the anomalous loading observed in tokamak ion-Bernstein-wave (IBW) experiments is due to a class of sheath-plasma waves (SPW) which propagate on high-voltage rf sheaths near the antenna. Particle simulations in one and two dimensions confirm the existence and scalings of the SPW. Coupling to the SPW modes can dominate coupling to the IBW, and qualitatively yields the observed dependences of antenna loading on parallel wave number, plasma density, and magnetic field. Antennas which minimize rf sheaths should improve the effectiveness of IBW heating. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP MYRA, JR (reprint author), LODESTAR RES CORP,BOULDER,CO 80301, USA. OI Forslund, David/0000-0002-6534-3392 NR 21 TC 19 Z9 19 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 MAR 4 PY 1991 VL 66 IS 9 BP 1173 EP 1176 DI 10.1103/PhysRevLett.66.1173 PG 4 WC Physics, Multidisciplinary SC Physics GA FA349 UT WOS:A1991FA34900018 ER PT J AU FACTOR, BJ RUSSELL, TP TONEY, MF AF FACTOR, BJ RUSSELL, TP TONEY, MF TI SURFACE-INDUCED ORDERING OF AN AROMATIC POLYIMIDE SO PHYSICAL REVIEW LETTERS LA English DT Article ID X-RAY-SCATTERING; DIFFRACTION; INTERFACES AB Grazing incidence x-ray diffraction has been used to characterize the near surface structure of an aromatic polyimide film. It is shown that within the first 90 angstrom from the surface the ordering of the polymer molecules is markedly enhanced. As the penetration depth of the x rays decreases, reflections characteristic of density correlations along the polymer chain axis shift to smaller scattering vectors and those indicative of intermolecular ordering become clearly evident. Thus, near the surface essentially crystalline order is seen. C1 IBM CORP,DIV RES,ALMADEN RES CTR,SAN JOSE,CA 95120. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP FACTOR, BJ (reprint author), STANFORD UNIV,DEPT APPL PHYS,STANFORD,CA 94305, USA. NR 22 TC 101 Z9 101 U1 2 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 4 PY 1991 VL 66 IS 9 BP 1181 EP 1184 DI 10.1103/PhysRevLett.66.1181 PG 4 WC Physics, Multidisciplinary SC Physics GA FA349 UT WOS:A1991FA34900020 ER PT J AU LORENZ, JC AF LORENZ, JC TI FRACTURE SPACING IN SLANT HORIZONTAL CORE, MESA VERDE FORMATION, CO - COMPARISON WITH OUTCROP AND VERTICAL-CORE DATA SO AAPG BULLETIN-AMERICAN ASSOCIATION OF PETROLEUM GEOLOGISTS LA English DT Meeting Abstract C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSN PETROL GEOLOGISTS 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 MAR PY 1991 VL 75 IS 3 BP 623 EP 623 PG 1 WC Energy & Fuels; Engineering, Petroleum; Geosciences, Multidisciplinary SC Energy & Fuels; Engineering; Geology GA FA437 UT WOS:A1991FA43700409 ER PT J AU NEGUSDEWYS, J KIMMELL, OE HART, GF PLUM, MM AF NEGUSDEWYS, J KIMMELL, OE HART, GF PLUM, MM TI THE FEASIBILITY OF RECOVERING MEDIUM TO HEAVY OIL USING GEOPRESSURED GEOTHERMAL FLUIDS SO AAPG BULLETIN-AMERICAN ASSOCIATION OF PETROLEUM GEOLOGISTS LA English DT Meeting Abstract C1 EG&G IDAHO INC,IDAHO FALLS,ID 83401. LOUISIANA STATE UNIV,BATON ROUGE,LA 70803. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSN PETROL GEOLOGISTS 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 MAR PY 1991 VL 75 IS 3 BP 645 EP 645 PG 1 WC Geosciences, Multidisciplinary SC Geology GA FA437 UT WOS:A1991FA43700500 ER PT J AU SPENCER, CW LORENZ, JC BROWN, CA AF SPENCER, CW LORENZ, JC BROWN, CA TI APPLICATION OF HORIZONTAL DRILLING TO TIGHT GAS-RESERVOIRS SO AAPG BULLETIN-AMERICAN ASSOCIATION OF PETROLEUM GEOLOGISTS LA English DT Meeting Abstract C1 US GEOL SURVEY,LAKEWOOD,CO 80225. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. SYNDER OIL CO,DENVER,CO. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSN PETROL GEOLOGISTS 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 MAR PY 1991 VL 75 IS 3 BP 675 EP 675 PG 1 WC Geosciences, Multidisciplinary SC Geology GA FA437 UT WOS:A1991FA43700633 ER PT J AU TEUFEL, LW AF TEUFEL, LW TI PERMEABILITY OF NATURALLY FRACTURED RESERVOIRS SO AAPG BULLETIN-AMERICAN ASSOCIATION OF PETROLEUM GEOLOGISTS LA English DT Meeting Abstract C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSN PETROL GEOLOGISTS 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 MAR PY 1991 VL 75 IS 3 BP 680 EP 680 PG 1 WC Energy & Fuels; Engineering, Petroleum; Geosciences, Multidisciplinary SC Energy & Fuels; Engineering; Geology GA FA437 UT WOS:A1991FA43700655 ER PT J AU CODY, WJ AF CODY, WJ TI PERFORMANCE EVALUATION OF PROGRAMS RELATED TO THE REAL GAMMA-FUNCTION SO ACM TRANSACTIONS ON MATHEMATICAL SOFTWARE LA English DT Article DE ACCURACY; DIGAMMA FUNCTION; GAMMA-FUNCTION; PERFORMANCE EVALUATION; PSI-FUNCTION; ROBUSTNESS AB Methods are presented for evaluating the performance of programs for the functions GAMMA(x), In GAMMA(x), and psi(x). Accuracy estimates are based on comparisons using the multiplication theorem. Ideas for checking robustness are also given, and details on specific implementations of test programs are included. RP CODY, WJ (reprint author), ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439, USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU ASSOC COMPUTING MACHINERY PI NEW YORK PA 1515 BROADWAY, NEW YORK, NY 10036 SN 0098-3500 J9 ACM T MATH SOFTWARE JI ACM Trans. Math. Softw. PD MAR PY 1991 VL 17 IS 1 BP 46 EP 54 DI 10.1145/103147.103153 PG 9 WC Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA HX891 UT WOS:A1991HX89100004 ER PT J AU CODY, WJ STOLTZ, L AF CODY, WJ STOLTZ, L TI THE USE OF TAYLOR-SERIES TO TEST ACCURACY OF FUNCTION PROGRAMS SO ACM TRANSACTIONS ON MATHEMATICAL SOFTWARE LA English DT Article DE BESSEL FUNCTIONS; DAWSON INTEGRAL; EXPONENTIAL INTEGRALS; PERFORMANCE EVALUATION AB This paper discusses the use of local Taylor series expansions for determining the accuracy of computer programs for special functions. The main example is testing of programs for exponential integrals. Additional applications include testing of programs for certain Bessel functions, Dawson's integral, and error functions. RP CODY, WJ (reprint author), ARGONNE NATL LAB,DIV MATH & COMP SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 10 TC 8 Z9 8 U1 0 U2 0 PU ASSOC COMPUTING MACHINERY PI NEW YORK PA 1515 BROADWAY, NEW YORK, NY 10036 SN 0098-3500 J9 ACM T MATH SOFTWARE JI ACM Trans. Math. Softw. PD MAR PY 1991 VL 17 IS 1 BP 55 EP 63 DI 10.1145/103147.103154 PG 9 WC Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA HX891 UT WOS:A1991HX89100005 ER PT J AU KESTERNICH, W PACKAN, NH SCHROEDER, H AF KESTERNICH, W PACKAN, NH SCHROEDER, H TI RADIATION-INDUCED PRECIPITATION AT GRAIN-BOUNDARIES IN NI-8 AT PERCENT-SI SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID INDUCED SEGREGATION; IRRADIATION; ALLOYS; BINARY AB High-resolution and quantitative energy dispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM) were used to study radiation-induced precipitation at grain boundaries. A Ni-8 at. % Si alloy which is in the solid solution region of the phase diagram, was irridated by either protons or alpha particles to 0.1-0.3 dpa at 750 K. Radiation-induced layers of gamma-'(Ni3Si) precipitates were produced on all grain boundaries and even on some coherent twin boundaries. The layers formed asymmetrically only on one side of the grain boundaries with the exception of the coherent twin boundaries on which precipitation was asymmetric. By using helium pre-implantation at 975 K to monitor the original grain boundary locations it was revealed that grain boundary migration was associated with the radiation induced precipitation. C1 OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37831 USA. RP KESTERNICH, W (reprint author), FORSCHUNGSZENTRUM JULICH, INST FESTKORPERFORSCH, FORSCHUNGSZENTRUM, POSTFACH 1913, W-5170 JULICH 1, GERMANY. NR 24 TC 3 Z9 3 U1 0 U2 2 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 MAR PY 1991 VL 39 IS 3 BP 351 EP 362 DI 10.1016/0956-7151(91)90314-Q PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA EX976 UT WOS:A1991EX97600011 ER PT J AU WOLF, U FOILES, SM FISCHMEISTER, HF AF WOLF, U FOILES, SM FISCHMEISTER, HF TI STUDY OF MISFIT DISLOCATIONS AT THE INTERFACE OF WEAKLY BONDED METAL METAL SYSTEMS SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID EMBEDDED-ATOM-METHOD; TRANSITION-METALS; BOUNDARIES; ENERGY; ALLOYS; MODEL; CU; NI AB The behaviour of misfit dislocations at Ag/Ni and Ag/Cu interfaces and the interface structures are discussed on the basis of calculations performed with the Embedded Atom Method (EAM). Particular attention is given to the possibility of the misfit dislocations being displaced out of the interface plane. The interface orientation chosen is (011)Ni/Cu parallel-to (011)Ag and [100]Ni/Cu parallel-to [100]Ag. Both systems have large and similar lattice mismatch but different ratios of their elastic moduli. Two different periodic cells have been considered for Ag/Ni, with opposite sign of the residual misfit. The interface energies and the structures of the regions of maximum misfit are found to be virtually independent of the periodic cell chosen. It is found that the misfit dislocations should be located at most one lattice spacing away from the interface in the lattice with the smaller lattice constant. This implies a reduction of the atomic density at the interface. C1 SANDIA NATL LABS, LIVERMORE, CA 94550 USA. RP WOLF, U (reprint author), MAX PLANCK INST MET RES, INST WERKSTOFFWISSENSCH, W-7000 STUTTGART 80, GERMANY. OI Foiles, Stephen/0000-0002-1907-454X NR 23 TC 23 Z9 24 U1 0 U2 2 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 MAR PY 1991 VL 39 IS 3 BP 373 EP 382 DI 10.1016/0956-7151(91)90316-S PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA EX976 UT WOS:A1991EX97600013 ER PT J AU HOUSTON, J FEIBELMAN, P AF HOUSTON, J FEIBELMAN, P TI ULTRATHIN METAL COATINGS YIELD UNIQUE PROPERTIES SO ADVANCED MATERIALS & PROCESSES LA English DT Article RP HOUSTON, J (reprint author), SANDIA NATL LABS,SURFACE INTERFACE & ION BEAM RES DEPT,ALBUQUERQUE,NM 87185, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 0026-0665 J9 ADV MATER PROCESS JI Adv. Mater. Process. PD MAR PY 1991 VL 139 IS 3 BP 31 EP 34 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA FA668 UT WOS:A1991FA66800005 ER PT J AU MAJKRZAK, CF KWO, J HONG, M YAFET, Y GIBBS, D CHIEN, CL BOHR, J AF MAJKRZAK, CF KWO, J HONG, M YAFET, Y GIBBS, D CHIEN, CL BOHR, J TI MAGNETIC RARE-EARTH SUPERLATTICES SO ADVANCES IN PHYSICS LA English DT Review ID X-RAY SCATTERING; DY-Y SUPERLATTICES; SPIN-WAVE DISPERSION; NEUTRON-DIFFRACTION; PHASE-TRANSITIONS; SINGLE-CRYSTAL; THIN-FILMS; GD; HOLMIUM; EXCHANGE AB Advances in molecular beam epitaxy deposition techniques have recently made it possible to grow, an atomic plane at a time, single crystalline superlattices composed of alternating layers of a magnetic rare earth, such as Gd, Dy, Ho, or Er, and metallic Y, which has an identical chemical structure. The primary goal of this article is to review the new and interesting magnetic structures which have been discovered in these novel superlattice systems and to consider what implications the observed phases have on our understanding of the underlying microscopic magnetic interactions. In particular, the effects of the artificial periodicity or compositional modulation, finite layer thickness, and epitaxial strain on the resulting long range magnetic order of Gd-Y, Dy-Y, Ho-Y, Er-Y, and Gd-Dy superlattices are described. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. BROOKHAVEN NATL LAB,UPTON,NY 11973. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. RISO NATL LAB,DK-4000 ROSKILDE,DENMARK. RP MAJKRZAK, CF (reprint author), NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899, USA. RI Hong, Minghwei/C-1433-2010; Bohr, Jakob/A-5819-2012 OI Bohr, Jakob/0000-0003-4076-2045 NR 117 TC 150 Z9 151 U1 3 U2 25 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0001-8732 J9 ADV PHYS JI Adv. Phys. PD MAR-APR PY 1991 VL 40 IS 2 BP 99 EP 189 DI 10.1080/00018739100101482 PG 91 WC Physics, Condensed Matter SC Physics GA FY365 UT WOS:A1991FY36500001 ER PT J AU EAKIN, DE LIEBETRAU, SF HALLEN, RT ROHRMANN, CA WALKUP, PC AF EAKIN, DE LIEBETRAU, SF HALLEN, RT ROHRMANN, CA WALKUP, PC TI FROM WASTES TO COVETED COMMODITIES SO AGRICULTURAL ENGINEERING LA English DT Article RP EAKIN, DE (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC AGR ENGINEERS PI ST JOSEPH PA 2950 NILES RD, ST JOSEPH, MI 49085-9659 SN 0002-1458 J9 AGR ENG PD MAR PY 1991 VL 72 IS 2 BP 11 EP 13 PG 3 WC Agronomy; Engineering, Multidisciplinary SC Agriculture; Engineering GA FB442 UT WOS:A1991FB44200005 ER PT J AU EAGAN, RJ AF EAGAN, RJ TI INTERNATIONAL INTERACTIONS SO AMERICAN CERAMIC SOCIETY BULLETIN LA English DT Editorial Material RP EAGAN, RJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7812 J9 AM CERAM SOC BULL JI Am. Ceram. Soc. Bull. PD MAR PY 1991 VL 70 IS 3 BP 277 EP 277 PG 1 WC Materials Science, Ceramics SC Materials Science GA FC022 UT WOS:A1991FC02200001 ER PT J AU KARNITZ, MA CRAIG, DF RICHLEN, SL AF KARNITZ, MA CRAIG, DF RICHLEN, SL TI CONTINUOUS FIBER CERAMIC COMPOSITE PROGRAM SO AMERICAN CERAMIC SOCIETY BULLETIN LA English DT Article C1 US DOE,WASHINGTON,DC 20585. RP KARNITZ, MA (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 0 TC 38 Z9 38 U1 0 U2 2 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7812 J9 AM CERAM SOC BULL JI Am. Ceram. Soc. Bull. PD MAR PY 1991 VL 70 IS 3 BP 430 EP 435 PG 6 WC Materials Science, Ceramics SC Materials Science GA FC022 UT WOS:A1991FC02200015 ER PT J AU JAQUISH, CE GAGE, TB TARDIF, SD AF JAQUISH, CE GAGE, TB TARDIF, SD TI REPRODUCTIVE FACTORS AFFECTING SURVIVORSHIP IN CAPTIVE CALLITRICHIDAE SO AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY LA English DT Article DE OPTIMAL LITTER SIZE; MATERNAL EFFECTS; SURVIVORSHIP; CALLITRICHIDAE ID COTTON-TOP TAMARINS; SAGUINUS-OEDIPUS; LITTER SIZE; MICE; GROWTH; PERFORMANCE; COLONY AB Efforts to breed Callitrichidae in captivity have resulted in high fertility accompanied by high infant mortality. This paper investigates the relationship between reproductive characteristics and survivorship in the Oak Ridge and Associated Universities (ORAU) callitrichid colony. Records of 2,834 individuals were analyzed using Cox Porportional Hazards regression to investigate factors affecting infant survivorship. Species and birth cohort were found to have a significant (P < 0.05) effect on survivorship. Litter size also was an important factor in determining survivorship. Individuals born into singlet and twin litters had significantly (P < 0.001) higher survivorship than triplets. Factors which affect survivorship perinatally (0-1 months of age), prior to breeding age and subsequent to the first month of life were then investigated. Litter size was a significant (P < 0.05) factor in determining survivorship perinatally, with twins having significantly higher survivorship than both singlets and triplets. After the first month of life, litter size no longer showed a significant effect on survivorship. Records of 145 dams were analyzed using the same procedures to investigate reproductive characterisitics associated with survivorship. Age at first litter showed a significant (P < 0.01) positive relationship with dam survivorship. These results suggest various factors affect survivorship at specific temporal points during development, and also suggest selection for survivorship perinatally to be strongly associated with litter size, possibly through sibling competition and maternal effects. C1 NORTHWESTERN UNIV,DEPT ANTHROPOL,EVANSTON,IL 60208. SUNY ALBANY,DEPT ANTHROPOL,ALBANY,NY 12222. RP JAQUISH, CE (reprint author), OAK RIDGE ASSOCIATED UNIV,MARMOSET RES CTR,POB 117,OAK RIDGE,TN 37831, USA. FU NCRR NIH HHS [R24 RR02022-05, RR02229]; NICHD NIH HHS [HD25346] NR 32 TC 25 Z9 27 U1 0 U2 2 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0002-9483 J9 AM J PHYS ANTHROPOL JI Am. J. Phys. Anthropol. PD MAR PY 1991 VL 84 IS 3 BP 291 EP 305 DI 10.1002/ajpa.1330840306 PG 15 WC Anthropology; Evolutionary Biology SC Anthropology; Evolutionary Biology GA EZ494 UT WOS:A1991EZ49400005 PM 1902628 ER PT J AU ANGEL, RJ MCMULLAN, RK PREWITT, CT AF ANGEL, RJ MCMULLAN, RK PREWITT, CT TI SUBSTRUCTURE AND SUPERSTRUCTURE OF MULLITE BY NEUTRON-DIFFRACTION SO AMERICAN MINERALOGIST LA English DT Article ID INCOMMENSURATE STRUCTURES AB The average structure of mullite with approximate composition SiO2.2Al2O3 has been refined using single-crystal neutron diffraction data. A split-site model for both tetrahedral and O positions was refined in order to reflect the local structural variation arising from both O-vacancy and Al-Si ordering. The resulting local atomic configurations are similar to those found in the related, but commensurate, phases sillimanite (Al2SiO5) and Al5(BO3)O6. The intensities of satellite reflections at positions 1/2c* +/- qa*, where q almost-equal-to 0.30 were also measured using single-crystal neutron diffraction. Analysis by Patterson methods demonstrates that these satellites arise from an incommensurate modulation involving two ordering patterns. The difference structures corresponding to these ordering patterns have symmetries P(c)nnm and P(c)bnm. Both require ordering of Al and Si over the tetrahedral sites within the mullite structure, and the P(c)nnm ordering also includes the ordering of O atoms and vacancies on one O atom site, which also drives Al ordering between the T and T* tetrahedral sites. The results demonstrate that the mullite structure is very well ordered on a local scale, with a corresponding low configurational entropy. C1 UNIV LONDON BIRKBECK COLL,DEPT CRISTALLOG,LONDON WC1E 7HX,ENGLAND. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. CARNEGIE INST WASHINGTON,GEOPHYS LAB,WASHINGTON,DC 20015. RP ANGEL, RJ (reprint author), UNIV LONDON UNIV COLL,DEPT GEOL SCI,GOWER ST,LONDON NW1 2HE,ENGLAND. RI Angel, Ross/K-9924-2015 OI Angel, Ross/0000-0003-0861-398X NR 22 TC 59 Z9 59 U1 0 U2 7 PU MINERALOGICAL SOC AMER PI WASHINGTON PA 1130 17TH ST NW SUITE 330, WASHINGTON, DC 20036 SN 0003-004X J9 AM MINERAL JI Am. Miner. PD MAR-APR PY 1991 VL 76 IS 3-4 BP 332 EP 342 PG 11 WC Geochemistry & Geophysics; Mineralogy SC Geochemistry & Geophysics; Mineralogy GA FN241 UT WOS:A1991FN24100002 ER PT J AU HEMINGWAY, BS ROBIE, RA APPS, JA AF HEMINGWAY, BS ROBIE, RA APPS, JA TI REVISED VALUES FOR THE THERMODYNAMIC PROPERTIES OF BOEHMITE, ALO(OH), AND RELATED SPECIES AND PHASES IN THE SYSTEM AL-H-O SO AMERICAN MINERALOGIST LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; HYDROXY-ALUMINUM SOLUTIONS; HEAT-CAPACITIES; AQUEOUS-SOLUTION; HYDROLYSIS; GIBBSITE; EQUILIBRIUM; ACID; SOLUBILITIES; CALORIMETRY AB Heat capacity measurements are reported for a well-characterized boehmite that differ significantly from results reported earlier by Shomate and Cook (1946) for a monohydrate of alumina. It is suggested that the earlier measurements were made on a sample that was a mixture of phases and that use of that heat-capacity and derived thermodynamic data be discontinued. The entropy of boehmite derived in this study is 37.19 +/- 0.10 J/(mol. K) at 298.15 K. A review of recent Al-27 solution NMR data and other experiments has shown that the method of preparation of Al-bearing solutions can significantly affect the concentration of monomeric Al species in solution. Because the procedures by which Al solution concentrations are measured in solubility studies determine the quantity of so-called monomeric species present, apparent differences in calculated gibbsite stability most likely arise from differences in experimental procedure rather than from differences in crystallinity, as often suggested. A review of published solubility data for gibbsite suggests that the best values that can be currently estimated from that data for the Gibbs free energies of formation of Al(OH)4- and Al3+ are -1305.0 +/- 1.3 and -489.8 +/- 4.0 kJ/mol, respectively (Hemingway et al., 1978). Based on our value for the entropy and accepting the recommended Gibbs free energy for Al(OH)4-, we have calculated the Gibbs free energy and enthalpy of formation of boehmite to be -918.4 +/- 2.1 and -996.4 +/- 2.2 kJ/mol, respectively, from solubility data for boehmite. The Gibbs energy for boehmite is unchanged from that given by Hemingway et al. (1978). C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP HEMINGWAY, BS (reprint author), US GEOL SURVEY,RESTON,VA 22092, USA. NR 72 TC 41 Z9 41 U1 0 U2 10 PU MINERALOGICAL SOC AMER PI WASHINGTON PA 1130 17TH ST NW SUITE 330, WASHINGTON, DC 20036 SN 0003-004X J9 AM MINERAL JI Am. Miner. PD MAR-APR PY 1991 VL 76 IS 3-4 BP 445 EP 457 PG 13 WC Geochemistry & Geophysics; Mineralogy SC Geochemistry & Geophysics; Mineralogy GA FN241 UT WOS:A1991FN24100010 ER PT J AU ARLINGHAUS, HF THONNARD, N SPAAR, MT SACHLEBEN, RA LARIMER, FW FOOTE, RS WOYCHIK, RP BROWN, GM SLOOP, FV JACOBSON, KB AF ARLINGHAUS, HF THONNARD, N SPAAR, MT SACHLEBEN, RA LARIMER, FW FOOTE, RS WOYCHIK, RP BROWN, GM SLOOP, FV JACOBSON, KB TI POTENTIAL APPLICATION OF SPUTTER-INITIATED RESONANCE IONIZATION SPECTROSCOPY FOR DNA SEQUENCING SO ANALYTICAL CHEMISTRY LA English DT Article AB To improve the technique for DNA sequencing, large numbers of stable isotopes could be used to label DNA, thereby multiplexing the separation process and providing a new and much faster procedure for localizing DNA after electrophoresis. Sputter-initiated resonance ionization spectroscopy (SIRIS) was used to demonstrate detection of subattomole quantities of isotopically enriched iron- and tin-labeled DNA with excellent lateral and mass resolution. The organometallic compounds, ferrocenecarboxylic acid and (triethylstannyl)-alkanecarboxylic acid, were synthesized and attached through the amine group of a 5'-hexylamine on the terminal position of an oligonucleotide. The adaptation of SIRIS for detecting samples containing 50 pmols of either iron or tin attached to DNA is described. Using high repetition rate lasers in SIRIS, it should eventually be possible to detect more than 10(7) bases per day if other preparation steps in the procedure do not become rate limiting. The results of analysis of iron- and tin-labeled DNA on polyacrylamide gels and Nylon membrane indicate that SIRIS has the potential to make a strong contribution to DNA sequencing and also for other methods that requires detection of the location and amount of DNA or an oligonucleotide that hybridizes to DNA. C1 UNIV TENNESSEE,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. RP ARLINGHAUS, HF (reprint author), ATOM SCI INC,114 RIDGEWAY CTR,OAK RIDGE,TN 37830, USA. RI Sloop, Jr., Frederick/J-2301-2016 OI Sloop, Jr., Frederick/0000-0001-6473-9507 NR 17 TC 26 Z9 26 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 MAR 1 PY 1991 VL 63 IS 5 BP 402 EP 407 DI 10.1021/ac00005a003 PG 6 WC Chemistry, Analytical SC Chemistry GA FA188 UT WOS:A1991FA18800005 ER PT J AU SOPER, SA SHERA, EB MARTIN, JC JETT, JH HAHN, JH NUTTER, HL KELLER, RA AF SOPER, SA SHERA, EB MARTIN, JC JETT, JH HAHN, JH NUTTER, HL KELLER, RA TI SINGLE-MOLECULE DETECTION OF RHODAMINE-6G IN ETHANOLIC SOLUTIONS USING CONTINUOUS WAVE LASER EXCITATION SO ANALYTICAL CHEMISTRY LA English DT Article ID HYDRODYNAMICALLY FOCUSED FLOWS; INDUCED FLUORESCENCE; LIGHT COLLECTION; PHYCOERYTHRIN; SAMPLES AB The ultimate in analytical sensitivity is the ability to detect analytes on a single-molecule level. Laser-induced fluorescence (LIF) detection of single molecules in solution is hampered by specular, Rayleigh, and Raman scattering that contribute significantly to the background. In order to observe individual fluorescent molecules as they transit the laser beam in the presence of large backgrounds, it is necessary to detect a large number of photons per molecule. One method to increase the number of photons per event is to increase the residence time of the molecule in the laser beam. However, with long residence times, photostability sets an upper limit on the number of times the molecule can be cycled between the ground and first excited singlet state. We have observed the passage of individual rhodamine 6G (R-6G) molecules in ethanol (EtOH). The use of EtOH as a solvent allows one to obtain nearly 2 orders of magnitude more photons per molecule than may be obtained in H2O. Observation of single molecular events of R-6G in EtOH is substantiated by autocorrelation analysis and from shifts in the histograms of the frequency of photoelectron counts. Results from Monte Carlo simulations also support our experimental results. RP SOPER, SA (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87545, USA. RI HAHN, JONGHOON/F-5384-2013 NR 18 TC 101 Z9 102 U1 1 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD MAR 1 PY 1991 VL 63 IS 5 BP 432 EP 437 DI 10.1021/ac00005a009 PG 6 WC Chemistry, Analytical SC Chemistry GA FA188 UT WOS:A1991FA18800011 ER PT J AU XI, XB YEUNG, ES AF XI, XB YEUNG, ES TI UNIVERSAL DETECTOR BASED ON MAGNETOOPTICAL ROTATION FOR HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY SO ANALYTICAL CHEMISTRY LA English DT Article ID TRACE; OPTIMIZATION; POLARIMETERS; SCATTERING; CADMIUM AB Magnetooptical rotation (MOR) or the Faraday effect in the absence of absorption is a general physical property for all substances and can be used for universal detection in high-performance liquid chromatography. The longitudinal magnetic field with moderate field strength is provided by a cheap and compact permanent magnet assembly. A simplified equation has been derived for calculating Verdet constants of mixtures. The experimental results confirm the linear relationship between the MOR signal and weight fraction of the solute in dilute solution. The linear range is limited by the artifact signals caused by the refractive index change at high concentrations. The feasibility of this method is demonstrated in the detection of polynuclear aromatic hydrocarbons, where the limit of detection is in the submicrogram range. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 40 TC 4 Z9 4 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD MAR 1 PY 1991 VL 63 IS 5 BP 490 EP 496 DI 10.1021/ac00005a021 PG 7 WC Chemistry, Analytical SC Chemistry GA FA188 UT WOS:A1991FA18800023 ER PT J AU STYRIS, DL PRELL, LJ REDFIELD, DA AF STYRIS, DL PRELL, LJ REDFIELD, DA TI MECHANISMS OF PALLADIUM-INDUCED STABILIZATION OF ARSENIC IN ELECTROTHERMAL ATOMIZATION ATOMIC-ABSORPTION SPECTROSCOPY SO ANALYTICAL CHEMISTRY LA English DT Article ID SPECTROMETRY; MODIFIER AB Mass spectrometry and atomic absorption spectroscopy were combined to elucidate the mechanisms that control atomization of arsenic and its stabilization by palladium in graphite furnaces. Gaseous species in the furnace were mass analyzed in real time. The As2O3 thermally decomposes, forming arsenic monoxide, higher arsenic oxides, and condensed-phase arsenic, which polymerizes and then sublimates as the dimer. Atomization occurs by dissociative adsorption of the oxide and desorption of the resulting arsenic. Palladium oxide stabilizes arsenic atomization by reacting with the condensed-phase arsenic, preventing evolution of the dimer by forming a [Pd(x)As(y)O(m)] compound or mixed solution. Elemental palladium reacts directly with the As2O3, probably forming the same compound; thus, dimer and oxide losses are completely inhibited. C1 NW NAZARENE COLL, DEPT CHEM, NAMPA, ID 83651 USA. RP STYRIS, DL (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 26 TC 50 Z9 52 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD MAR 1 PY 1991 VL 63 IS 5 BP 503 EP 507 DI 10.1021/ac00005a023 PG 5 WC Chemistry, Analytical SC Chemistry GA FA188 UT WOS:A1991FA18800025 ER PT J AU STYRIS, DL PRELL, LJ REDFIELD, DA HOLCOMBE, JA BASS, DA MAJIDI, V AF STYRIS, DL PRELL, LJ REDFIELD, DA HOLCOMBE, JA BASS, DA MAJIDI, V TI MECHANISMS OF SELENIUM VAPORIZATION WITH PALLADIUM MODIFIERS USING ELECTROTHERMAL ATOMIZATION AND MASS-SPECTROMETRIC DETECTION SO ANALYTICAL CHEMISTRY LA English DT Article ID ATOMIC-ABSORPTION SPECTROMETRY; MATRIX MODIFICATION; GRAPHITE; LEAD AB Mass spectrometric sampling of gaseous species that evolve from graphite flats and tubes that are pulse heated in vacuo and from graphite tubes that are pulse heated at 1 atm of pressure was employed in order to elucidate mechanisms controlling selenium electrothermal atomization. Investigations were performed (i) without modifier, (ii) with thermally reduced palladium modifier, and (iii) with nonreduced palladium modifier. Selenium oxides, carbides, hydroxides, dimer, free atom, and palladium were observed as a function of time and temperature during the atomization cycle. The reduced palladium modifier eliminated formation of the molecular selenium species except selenium monoxide. Both SeO and SeO2 were observed when the nonreduced palladium modifier was involved. In both cases, palladium forms a stoichiometric compound with selenium that retains the selenium until higher temperatures are reached. C1 UNIV TEXAS, DEPT CHEM, AUSTIN, TX 78712 USA. RP STYRIS, DL (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 27 TC 83 Z9 83 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD MAR 1 PY 1991 VL 63 IS 5 BP 508 EP 517 DI 10.1021/ac00005a024 PG 10 WC Chemistry, Analytical SC Chemistry GA FA188 UT WOS:A1991FA18800026 ER PT J AU HORWITZ, EP DIETZ, ML FISHER, DE AF HORWITZ, EP DIETZ, ML FISHER, DE TI SEPARATION AND PRECONCENTRATION OF STRONTIUM FROM BIOLOGICAL, ENVIRONMENTAL, AND NUCLEAR WASTE SAMPLES BY EXTRACTION CHROMATOGRAPHY USING A CROWN-ETHER SO ANALYTICAL CHEMISTRY LA English DT Note ID SILICA-GEL; EARTH METALS; MILK; ALKALI; SR-90 RP HORWITZ, EP (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 32 TC 239 Z9 245 U1 0 U2 36 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD MAR 1 PY 1991 VL 63 IS 5 BP 522 EP 525 DI 10.1021/ac00005a027 PG 4 WC Chemistry, Analytical SC Chemistry GA FA188 UT WOS:A1991FA18800029 PM 1829590 ER PT J AU YEUNG, ES KUHR, WG AF YEUNG, ES KUHR, WG TI INDIRECT DETECTION METHODS FOR CAPILLARY SEPARATIONS SO ANALYTICAL CHEMISTRY LA English DT Article ID ZONE ELECTROPHORESIS; LIQUID-CHROMATOGRAPHY; ELECTROCHEMICAL DETECTION; ION CHROMATOGRAPHY; FLUOROMETRIC DETECTION; FLUORESCENCE DETECTION; AMPEROMETRIC DETECTION; MICELLAR SOLUTIONS; INORGANIC ANIONS; PHASE C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. UNIV CALIF RIVERSIDE,DEPT CHEM,RIVERSIDE,CA 92521. RP YEUNG, ES (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 40 TC 121 Z9 123 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD MAR 1 PY 1991 VL 63 IS 5 BP A275 EP & DI 10.1021/ac00005a001 PG 0 WC Chemistry, Analytical SC Chemistry GA FA188 UT WOS:A1991FA18800002 ER PT J AU BREIMAN, L AF BREIMAN, L TI MULTIVARIATE ADAPTIVE REGRESSION SPLINES - DISCUSSION SO ANNALS OF STATISTICS LA English DT Discussion RP BREIMAN, L (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DEPT STAT,367 EVANS HALL,BERKELEY,CA 94720, USA. NR 6 TC 4 Z9 4 U1 1 U2 2 PU INST MATHEMATICAL STATISTICS PI HAYWARD PA IMS BUSINESS OFFICE-SUITE 6 3401 INVESTMENT BLVD, HAYWARD, CA 94545 SN 0090-5364 J9 ANN STAT JI Ann. Stat. PD MAR PY 1991 VL 19 IS 1 BP 82 EP 91 DI 10.1214/aos/1176347965 PG 10 WC Statistics & Probability SC Mathematics GA FF047 UT WOS:A1991FF04700003 ER PT J AU RUTHERFORD, B YAKOWITZ, S AF RUTHERFORD, B YAKOWITZ, S TI ERROR INFERENCE FOR NONPARAMETRIC REGRESSION SO ANNALS OF THE INSTITUTE OF STATISTICAL MATHEMATICS LA English DT Article DE CONFIDENCE INTERVALS; BOOTSTRAPPING; ASYMPTOTIC NORMALITY; ERROR INFERENCE ID CONFIDENCE BANDS AB This study examines means for inferring the distribution of the error in nonparametric regression. The central objective is to develop confidence intervals for nonparametric regression. Our computational study would seem to affirm that our methods are potentially useful in cases of small sample size or heterogeneously distributed error. Theoretical developments offer sufficient conditions for asymptotic normality. C1 SANDIA LABS,DEPT RELIABIL,ALBUQUERQUE,NM 87112. UNIV ARIZONA,DEPT SYST & IND ENGN,TUCSON,AZ 85721. NR 19 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 0020-3157 J9 ANN I STAT MATH JI Ann. Inst. Stat. Math. PD MAR PY 1991 VL 43 IS 1 BP 115 EP 129 DI 10.1007/BF00116472 PG 15 WC Statistics & Probability SC Mathematics GA FH218 UT WOS:A1991FH21800013 ER PT J AU STEVEN, FS GRIFFIN, MM CEDERHOLMWILLIAMS, SA MANGEL, WF MAIER, H AF STEVEN, FS GRIFFIN, MM CEDERHOLMWILLIAMS, SA MANGEL, WF MAIER, H TI EVIDENCE FOR THE FUNCTIONAL SIMILARITY BETWEEN TUMOR-CELL SURFACE GUANIDINOBENZOATASE AND TISSUE-TYPE PASMINOGEN ACTIVATOR SO ANTICANCER RESEARCH LA English DT Article DE PLASMINOGEN ACTIVATOR; GUANIDINOBENZOATASE; TUMOR CELL SURFACE ID PLASMINOGEN-ACTIVATOR; PURIFICATION; PROTEINASES AB Tumour cells possess a cell-surface protease referred to as guanidinobenzoatase (GB). The active centre of GB binds the fluorescent probe 9-amino acridine (9-AA) and this binding enables cells possessing active GB to be located by fluorescent microscopy. GB binding of 9-AA was inhibited by prior treatment of sections of tumour tissue with a specific polyclonal antibody recognising the tumour associated protease tissue plasminogen activator (t-PA). GB binding of 9-AA was also inhibited by prior treatment of sections of tumour tissues with PAI-1, a protein inhibitor of plasminogen activatory. We conclude from these studies and kinetic analyses that GB and t-PA are very similar both in structure and function. C1 JOHN RADCLIFFE HOSP,NUFFIELD DEPT OBSTET & GYNAECOL,OXFORD OX3 9DU,ENGLAND. ASSOC UNIV INC,BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV HEIDELBERG,HALS NASEU & OHRENKLIN,W-6900 HEIDELBERG 1,GERMANY. RP STEVEN, FS (reprint author), UNIV MANCHESTER,SCH BIOL RES,DEPT BIOCHEM & MOLEC BIOL,MANCHESTER M13 9PT,LANCS,ENGLAND. NR 17 TC 22 Z9 23 U1 1 U2 1 PU INT INST ANTICANCER RESEARCH PI ATHENS PA EDITORIAL OFFICE 1ST KM KAPANDNTIOU-KALAMOU RD KAPANDRITI, POB 22, ATHENS 19014, GREECE SN 0250-7005 J9 ANTICANCER RES JI Anticancer Res. PD MAR-APR PY 1991 VL 11 IS 2 BP 641 EP 647 PG 7 WC Oncology SC Oncology GA FU206 UT WOS:A1991FU20600021 PM 1905903 ER PT J AU FREDRICKSON, JK BROCKMAN, FJ WORKMAN, DJ LI, SW STEVENS, TO AF FREDRICKSON, JK BROCKMAN, FJ WORKMAN, DJ LI, SW STEVENS, TO TI ISOLATION AND CHARACTERIZATION OF A SUBSURFACE BACTERIUM CAPABLE OF GROWTH ON TOLUENE, NAPHTHALENE, AND OTHER AROMATIC-COMPOUNDS SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Article ID MOLECULAR RELATIONSHIPS; PSEUDOMONAS-PUTIDA; SOUTH-CAROLINA; TOL PLASMID; SEDIMENTS; DIBENZOTHIOPHENE; HYBRIDIZATION; DNA; METABOLISM; DIVERSITY AB A bacterium, designated F199, utilized toluene, naphthalene, dibenzothiophene, salicylate, benzoate, p-cresol, and all isomers of xylene as a sole carbon and energy source. This bacterium was isolated from Middendorf sediments, a Cretaceous age formation that underlies the Southeast Coastal Plain in South Carolina, at a depth of approximately 410 m. F199 is a gram-positive, irregular-shaped bacterium that has a varied cell morphology that is dependent on culture medium type and growth stage. F199 required microaerobic conditions (40 to 80-mu-M O2) for growth on hydrocarbons, glucose, acetate, and lactate in mineral salts medium but not for growth on rich media. [C-14]naphthalene mineralization by F199 was induced by either naphthalene or toluene; however, [C-14]toluene mineralization by this strain was induced by toluene but not naphthalene. F199 was also found to harbor two plasmids larger than 100 kb. Restricted F199 plasmid and genomic DNA did not hybridize with toluene (pWW0) or naphthalene (NAH7) catabolic plasmid DNA probes. The presence in the Middendorf formation of bacteria with the capacity for degrading a variety of aromatic compounds suggests that indigenous microorganisms may have potential for in situ degradation of organic contaminants. RP FREDRICKSON, JK (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 42 TC 96 Z9 99 U1 1 U2 8 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1752 N ST NW, WASHINGTON, DC 20036-2904 USA SN 0099-2240 J9 APPL ENVIRON MICROB JI Appl. Environ. Microbiol. PD MAR PY 1991 VL 57 IS 3 BP 796 EP 803 PG 8 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA FA764 UT WOS:A1991FA76400029 PM 16348445 ER PT J AU CONVERSE, AO EVANS, RJ AF CONVERSE, AO EVANS, RJ TI THERMAL, CHEMICAL, AND BIOLOGICAL PROCESSING - INTRODUCTION SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Editorial Material C1 SOLAR ENERGY RES INST,GOLDEN,CO 80401. RP CONVERSE, AO (reprint author), DARTMOUTH COLL,HANOVER,NH 03755, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 3 EP 3 DI 10.1007/BF02922584 PG 1 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300002 ER PT J AU WEBB, OF PHELPS, TJ BIENKOWSKI, PR DIGRAZIA, PM REED, GD APPLEGATE, B WHITE, DC SAYLER, GS AF WEBB, OF PHELPS, TJ BIENKOWSKI, PR DIGRAZIA, PM REED, GD APPLEGATE, B WHITE, DC SAYLER, GS TI DEVELOPMENT OF A DIFFERENTIAL VOLUME REACTOR SYSTEM FOR SOIL BIODEGRADATION STUDIES SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 12TH SYMP ON BIOTECHNOLOGY FOR FUELS AND CHEMICALS CY MAY 07-11, 1990 CL GATLINBURG, TN SP US DOE, DIV BIOFUELS SYST, OAK RIDGE NATL LAB, SOLAR ENERGY RES INST, BADGER ENGINEERS, AMER CHEM SOC, DIV BIOCHEM TECHNOL DE BIODEGRADATION KINETICS; SOIL SYSTEMS; REACTOR DESIGN; POLYCYCLIC AROMATIC HYDROCARBONS; GENE PROBES; ONLINE DETECTION ID POLYCYCLIC AROMATIC-HYDROCARBONS; SORPTION AB A bench scale experimental system was developed for the analysis of polycyclic aromatic hydrocarbon (PAH) degradation by mixed microbial cultures in PAH contaminated Manufactured Gas Plant (MGP) soils and on sand. The reactor system was chosen in order to provide a fundamental protocol capable for evaluating the performance of specific mixed microbial cultures on specific soil systems by elucidating the important system variables and their interactions. The reactor design and peripherals are described. A plug flow differential volume reactor (DVR) was used in order to remove performance effects related to reactor type, as opposed to system structure. This reactor system could be well represented mathematically. Methods were developed for on-line quantitative determination of PAH liquid phase concentrations. The mathematical models and experimental data are presented for the biodegradation of naphthalene on artificial and MGP soils. C1 UNIV TENNESSEE,CTR ENVIRONM BIOTECHNOL,KNOXVILLE,TN 37996. UNIV TENNESSEE,DEPT CHEM ENGN,KNOXVILLE,TN 37996. UNIV TENNESSEE,DEPT CIVIL ENGN,KNOXVILLE,TN 37996. UNIV TENNESSEE,DEPT MICROBIOL,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. UNIV TENNESSEE,INST APPL MICROBIOL,KNOXVILLE,TN 37932. RI phelps, tommy/A-5244-2011 NR 19 TC 6 Z9 6 U1 0 U2 0 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 5 EP 19 DI 10.1007/BF02922585 PG 15 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300003 PM 1929380 ER PT J AU RORRER, GL HAWLEY, MC LAMPORT, D AF RORRER, GL HAWLEY, MC LAMPORT, D TI SOLVOLYSIS OF A SINGLE LIGNOCELLULOSE WAFER BY ANHYDROUS HYDROGEN-FLUORIDE (HF) VAPOR - EFFECT OF TEMPERATURE ON HF ADSORPTION, GLUCOSE-PRODUCTION RATE, AND REVERSION KINETICS SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 12TH SYMP ON BIOTECHNOLOGY FOR FUELS AND CHEMICALS CY MAY 07-11, 1990 CL GATLINBURG, TN SP US DOE, DIV BIOFUELS SYST, OAK RIDGE NATL LAB, SOLAR ENERGY RES INST, BADGER ENGINEERS, AMER CHEM SOC, DIV BIOCHEM TECHNOL DE HYDROGEN FLUORIDE; SOLVOLYSIS; LIGNOCELLULOSE; ADSORPTION; KINETICS ID PURE CELLULOSE; WOOD; BEHAVIOR AB The solvolysis of a single lignocellulose wafer by anhydrous HF vapor at 1.0 atm was studied by exploring the effect of temperature (30 to 80-degrees-C) on (1) HF adsorption and desorption, (2) reaction rate and glucose yield, and (3) glucosyl fluoride repolymerization. All three processes are coupled, and 100% HF vapor temperature is the key process variable. The HF loading (g HF adsorbed/g-lignocellulose) decreased with increasing HF vapor temperature (1.42 g HF/g-lignocellulose at 31-degrees-C, 0.382 g HF/g lignocellulose at 60-degrees-C), indicating physical adsorption. Adsorbed HF was the limiting reagent for cellulose solvolysis: 0.4 g HF/g lignocellulose was required for saturation of hydroxyl groups and solvolysis of the glycosidic linkages. The extent of glucosyl fluoride repolymerization, as measured by HPLC-oligosaccharide profiling, increased with increasing HF vapor temperature. After posthydrolysis of water-soluble reaction products, glucose yields averaged 94% of theoretical. C1 MICHIGAN STATE UNIV,DEPT CHEM ENGN,E LANSING,MI 48824. MICHIGAN STATE UNIV,US DOE,PLANT RES LAB,E LANSING,MI 48824. RP RORRER, GL (reprint author), OREGON STATE UNIV,DEPT CHEM ENGN,CORVALLIS,OR 97331, USA. RI Rorrer, Greg/A-8189-2009 NR 17 TC 2 Z9 2 U1 0 U2 2 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 43 EP 58 DI 10.1007/BF02922588 PG 16 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300006 ER PT J AU TORGET, R WALTER, P HIMMEL, M GROHMANN, K AF TORGET, R WALTER, P HIMMEL, M GROHMANN, K TI DILUTE-ACID PRETREATMENT OF CORN RESIDUES AND SHORT-ROTATION WOODY CROPS SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 12TH SYMP ON BIOTECHNOLOGY FOR FUELS AND CHEMICALS CY MAY 07-11, 1990 CL GATLINBURG, TN SP US DOE, DIV BIOFUELS SYST, OAK RIDGE NATL LAB, SOLAR ENERGY RES INST, BADGER ENGINEERS, AMER CHEM SOC, DIV BIOCHEM TECHNOL DE DILUTE-ACID PRETREATMENT; SHORT-ROTATION CROPS; HARDWOODS; HERBACEOUS CROPS; CELLULASE DIGESTION ID ENZYMATIC-HYDROLYSIS AB As a prerequisite for the enzymatic saccharification or simultaneous saccharification and fermentation process for ethanol synthesis, a dilute-acid pretreatment of the biomass has been shown to be a very effective first step in the yeast-catalyzed bioprocess. Three hardwoods (silver maple, sycamore, and black locust) and two corn residues (cobs and stover) were chosen and subjected to prehydrolysis with dilute sulfuric acid at 140 and 160-degrees-C for reaction times ranging from 5 to 60 min. Although the hemicelluloses from all five samples could be completely hydrolyzed at both 140 and 160-degrees-C, hydrolysis at 160-degrees-C for the woods and stover produced a superior substrate for the cellulase enzyme from Trichoderma reesei, in which > 90% of the cellulose was hydrolyzed by the enzyme. Corn cobs produced an excellent substrate after only 5 min at 140-degrees-C. Small amounts of lignin and glucan were also solubilized by the acid in all samples. RP TORGET, R (reprint author), SOLAR ENERGY RES INST,DIV SOLAR FUELS RES,BIOTECHNOL RES BRANCH,APPL BIOL SCI SECT,GOLDEN,CO 80401, USA. NR 20 TC 136 Z9 144 U1 0 U2 28 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 75 EP 86 DI 10.1007/BF02922590 PG 12 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300008 ER PT J AU SCHELL, DJ TORGET, R POWER, A WALTER, PJ GROHMANN, K HINMAN, ND AF SCHELL, DJ TORGET, R POWER, A WALTER, PJ GROHMANN, K HINMAN, ND TI A TECHNICAL AND ECONOMIC-ANALYSIS OF ACID-CATALYZED STEAM EXPLOSION AND DILUTE SULFURIC-ACID PRETREATMENTS USING WHEAT STRAW OR ASPEN WOOD CHIPS SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 12TH SYMP ON BIOTECHNOLOGY FOR FUELS AND CHEMICALS CY MAY 07-11, 1990 CL GATLINBURG, TN SP US DOE, DIV BIOFUELS SYST, OAK RIDGE NATL LAB, SOLAR ENERGY RES INST, BADGER ENGINEERS, AMER CHEM SOC, DIV BIOCHEM TECHNOL DE PRETREATMENT; SULFURIC ACID; STEAM EXPLOSION; ASPEN WOOD; WHEAT STRAW AB Lignocellulosic biomass is one of the most plentiful and potentially cheapest feedstocks for ethanol production. The cellulose component can be broken down into glucose by enzymes and then converted to ethanol by yeast. However, hydrolysis of cellulose to glucose is difficult, and some form of pretreatment is necessary to increase the susceptibility of cellulose to enzymatic attack. An analysis has been completed to two pretreatment options, dilute sulfuric acid hydrolysis and sulfur dioxide impregnated steam explosion, for two feedstocks, wheat straw and aspen wood chips. Detailed process flow sheets and material and energy balances were used to generate equipment cost information. A technical and economic analysis compared the two feedstocks for each of the two pretreatments. For the same pretreatment, sugars produced from aspen wood hydrolysis were cheaper because of the higher carbohydrate content of aspen, whereas dilute acid pretreatment is favored over acid-catalyzed steam explosion. C1 ARTHUR J POWER & ASSOCIATES INC,BOULDER,CO 80304. RP SCHELL, DJ (reprint author), SOLAR ENERGY RES INST,DIV SOLAR FUELS RES,BIOTECHNOL RES BRANCH,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 23 TC 43 Z9 43 U1 1 U2 9 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 87 EP 97 DI 10.1007/BF02922591 PG 11 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300009 ER PT J AU SHAH, MM SONG, SK LEE, YY TORGET, R AF SHAH, MM SONG, SK LEE, YY TORGET, R TI EFFECT OF PRETREATMENT ON SIMULTANEOUS SACCHARIFICATION AND FERMENTATION OF HARDWOOD INTO ACETONE BUTANOL SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 12TH SYMP ON BIOTECHNOLOGY FOR FUELS AND CHEMICALS CY MAY 07-11, 1990 CL GATLINBURG, TN SP US DOE, DIV BIOFUELS SYST, OAK RIDGE NATL LAB, SOLAR ENERGY RES INST, BADGER ENGINEERS, AMER CHEM SOC, DIV BIOCHEM TECHNOL DE PRETREATMENT; SIMULTANEOUS SACCHARIFICATION AND FERMENTATION; MONOETHANOLAMINE; SUPERCRITICAL CO2-SO2; CLOSTRIDIUM-ACETOBUTYLICUM AB The effectiveness of pretreatments on hardwood substrate was investigated in connection with its subsequent conversion by simultaneous saccharification and fermentation (SSF), using Clostridium acetobutylicum. The main objectives of the pretreatment were to achieve efficient separation of lignin from carbohydrates, and to obtain maximum sugar yield on enzymatic hydrolysis of pretreated wood. Two methods have given promising results: (1) supercritical CO2-SO2 treatment, and (2) monoethanolamine (MEA) treatment. The MEA pretreatment removed above 90% of hardwood lignin while retaining 83% of carbohydrates. With CO2-SO2 pretreatment, the degree of lignin separation was lower. Under the scheme of SSF, the pretreated hardwood was converted to acetone, butanol, and ethanol (ABE) via single stage processing by cellulase enzyme system and C. acetobutylicum cells. The product yield in the process was such that 15 g of ABE/100 g of dry aspen wood was produced. In the overall process of SSF, the enzymatic hydrolysis was found to be the rate-limiting step. The ability of C. acetobutylicum to metabolize various 6-carbon and 5-carbon sugars resulted in efficient utilization of all available sugars from hardwood. C1 AUBURN UNIV,DEPT CHEM ENGN,AUBURN,AL 36849. SOLAR ENERGY RES INST,GOLDEN,CO 80401. NR 14 TC 12 Z9 12 U1 1 U2 8 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 99 EP 109 DI 10.1007/BF02922592 PG 11 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300010 PM 1929394 ER PT J AU HO, NWY GROHMANN, K AF HO, NWY GROHMANN, K TI APPLIED BIOLOGICAL-RESEARCH 1 - INTRODUCTION SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Editorial Material C1 SOLAR ENERGY RES INST,GOLDEN,CO 80401. RP HO, NWY (reprint author), PURDUE UNIV,W LAFAYETTE,IN 47907, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 129 EP 129 DI 10.1007/BF02922594 PG 1 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300012 ER PT J AU FAISON, BD CLARK, TM LEWIS, SN MA, CY SHARKEY, DM WOODWARD, CA AF FAISON, BD CLARK, TM LEWIS, SN MA, CY SHARKEY, DM WOODWARD, CA TI DEGRADATION OF ORGANIC SULFUR-COMPOUNDS BY A COAL-SOLUBILIZING FUNGUS SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 12TH SYMP ON BIOTECHNOLOGY FOR FUELS AND CHEMICALS CY MAY 07-11, 1990 CL GATLINBURG, TN SP US DOE, DIV BIOFUELS SYST, OAK RIDGE NATL LAB, SOLAR ENERGY RES INST, BADGER ENGINEERS, AMER CHEM SOC, DIV BIOCHEM TECHNOL DE COAL; COAL SOLUBILIZATION; DIBENZOTHIOPHENE; PAECILOMYCES; COAL DESULFURIZATION ID PHANEROCHAETE-CHRYSOSPORIUM; MICROBIAL CONVERSION; DIBENZOTHIOPHENE; OXIDATION; DESULFURIZATION; LIGNINASE AB Paecilomyces sp. TLi, a coal-solubilizing fungus, was shown to degrade organic sulfur-containing coal substructure compounds. Dibenzothiophene was degraded via a sulfur-oxidizing pathway to 2,2'-dihydroxybiphenyl. No further metabolism of that compound was observed. Ethyl phenyl sulfide and diphenyl sulfide were degraded to the corresponding sulfones. A variety of products were formed from dibenzyl sulfide, presumably via free radical intermediates. Diphenyl disulfide and dibenzyl disulfide were cleaved to the corresponding thiols and other single-ring products. It was concluded that degradation of organic sulfur compounds by Paecilomyces involves an oxidative attack localized at the sulfur atom. C1 UNIV DETROIT,DETROIT,MI 48221. CALIF POLYTECH UNIV SAN LUIS OBISPO,SAN LUIS OBISPO,CA 93410. RP FAISON, BD (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 22 TC 21 Z9 21 U1 0 U2 2 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 237 EP 251 DI 10.1007/BF02922604 PG 15 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300022 PM 1929365 ER PT J AU WOODWARD, J CLARKE, KM AF WOODWARD, J CLARKE, KM TI HYDROLYSIS OF CELLOBIOSE BY IMMOBILIZED BETA-GLUCOSIDASE ENTRAPPED IN MAINTENANCE-FREE GEL SPHERES SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 12TH SYMP ON BIOTECHNOLOGY FOR FUELS AND CHEMICALS CY MAY 07-11, 1990 CL GATLINBURG, TN SP US DOE, DIV BIOFUELS SYST, OAK RIDGE NATL LAB, SOLAR ENERGY RES INST, BADGER ENGINEERS, AMER CHEM SOC, DIV BIOCHEM TECHNOL DE IMMOBILIZATION; BETA-GLUCOSIDASE; PROPYLENE GLYCOL ALGINATE BONE GELATIN; CELLOBIOSE HYDROLYSIS ID FUNGAL AB A crude preparation of Aspergillus niger beta-glucosidase (27.5 cellobiase U/mg protein at 40-degrees-C, pH 5.0) was immobilized on concanavalin A-Sepharose (CAS). The cellobiase activity of the immobilized enzyme was 1334 U/mg dried CAS or 108 U/mL CAS gel. The beta-glucosidase-CAS complex was entrapped within crosslinked propylene glycol alginate/bone-geletin gel spheres that possessed between 0.67 and 2.35 cellobiase U/mL spheres, depending on their size. The effect of cellobiose concentration (10-300 mM) on the activity of native, immobilized, and gel-entrapped enzyme was determined. It was shown that concentrations of cellobiose between 10 and 180 mM were not inhibitory to the entrapped enzyme, although inhibition was found to occur with the native and immobilized enzyme. Exogenous ion addition was not necessary to maintain the structural integrity of the spheres, which were stable for 4 d at 40-degrees-C. C1 MARQUETTE UNIV,HIGH SCH,MILWAUKEE,WI 53208. RP WOODWARD, J (reprint author), OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831, USA. NR 8 TC 7 Z9 7 U1 2 U2 2 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 277 EP 283 DI 10.1007/BF02922607 PG 7 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300025 ER PT J AU RIVARD, CJ GROHMANN, K AF RIVARD, CJ GROHMANN, K TI DEGRADATION OF FURFURAL (2-FURALDEHYDE) TO METHANE AND CARBON-DIOXIDE BY AN ANAEROBIC CONSORTIUM SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 12TH SYMP ON BIOTECHNOLOGY FOR FUELS AND CHEMICALS CY MAY 07-11, 1990 CL GATLINBURG, TN SP US DOE, DIV BIOFUELS SYST, OAK RIDGE NATL LAB, SOLAR ENERGY RES INST, BADGER ENGINEERS, AMER CHEM SOC, DIV BIOCHEM TECHNOL DE ANAEROBIC DIGESTION; CSTR; FURFURAL; FURFURYL ALCOHOL; FUROIC ACID; METHANE PRODUCTION ID ACID; HYDROLYSIS; STORAGE; STABILITY; BACTERIUM; BIOMASS; JUICE; WINES AB Furfural, a byproduct formed during the thermal/chemical pretreatment of hemicellulosic biomass, was degraded to methane and carbon dioxide under anaerobic conditions. The consortium of anaerobic microbes responsible for the degradation was enriched using small continuously stirred tank reactor (CSTR) systems with daily batch feeding of biomass pretreatment liquor and continuous addition of furfural. Although the continuous infusion of furfural was initially inhibitory to the anaerobic CSTR system, adaptation of the consortium occurred rapidly with high rates of furfural addition. Addition rates of 7.35 mg furfural/700-mL reactor/d resulted in biogas productions of 375%, of that produced in control CSTR systems, fed the biomass pretreatment liquor only. The anaerobic CSTR system fed high levels of furfural was stable, with a sludge pH of 7.1 and methane gas composition of 69%, compared to the control CSTR, which had a pH of 7.2 and 77% methane. CSTR systems in which furfural was continuously added resulted in 80% of the theoretically expected biogas. Intermediates in the anaerobic biodegradation of furfural were determined by spike additions in serum-bottle assays using the enriched consortium from the CSTR systems. Furfural was converted to several intermediates, including furfuryl alcohol, furoic acid, and acetic acid, before final conversion to methane and carbon dioxide. RP RIVARD, CJ (reprint author), SOLAR ENERGY RES INST,DIV SOLAR FUELS RES,BIOTECHNOL RES BRANCH,APPL BIOL SCI SECT,GOLDEN,CO 80401, USA. NR 41 TC 17 Z9 17 U1 0 U2 9 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 285 EP 295 DI 10.1007/BF02922608 PG 11 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300026 PM 1929367 ER PT J AU OFFORD, DA LEE, NE WOODWARD, J AF OFFORD, DA LEE, NE WOODWARD, J TI PREPARATIVE PURIFICATION OF TRICHODERMA-REESEI NATIVE AND CORE CELLOBIOHYDROLASE-I BY ELECTROPHORESIS AND CHROMATOFOCUSING SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Note DE CELLOBIOHYDROLASE-I; TRICHODERMA-REESEI; PURIFICATION; NATIVE ENZYME; CORE ENZYME ID FUNCTIONAL DOMAINS; CELLULASE; PROTEOLYSIS; SEPARATION C1 BETHANY COLL,OAK RIDGE SCI & ENGN RES SEMESTER STUDENT,BETHANY,WV 26032. RP OFFORD, DA (reprint author), OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831, USA. NR 15 TC 14 Z9 14 U1 0 U2 0 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 377 EP 386 DI 10.1007/BF02922617 PG 10 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300035 ER PT J AU LIEN, S STRANDBERG, GW AF LIEN, S STRANDBERG, GW TI APPLIED BIOLOGICAL RESEARCH-II - INTRODUCTION SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Editorial Material C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP LIEN, S (reprint author), US DOE,IDAHO OPERAT OFF,IDAHO NATL ENGN LAB,OAK RIDGE,TN 37831, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 409 EP 409 DI 10.1007/BF02922620 PG 1 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300038 ER PT J AU POLMAN, JK BRECKENRIDGE, CR DUGAN, PR QUIGLEY, DR AF POLMAN, JK BRECKENRIDGE, CR DUGAN, PR QUIGLEY, DR TI GROWTH OF AEROBIC-BACTERIA ON ALKALI-SOLUBILIZED LIGNITE SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Note DE COAL; LIGNITE; TETRAHYDROFURAN; AEROBIC BACTERIA ID MOLECULAR-STRUCTURE; COAL; DESULFURIZATION C1 EG&G IDAHO INC,CTR BIOL PROC,POB 1625,IDAHO FALLS,ID 83415. EG&G IDAHO INC,IDAHO NAT ENGN LAB,BIOTECHNOL UNIT,IDAHO FALLS,ID 83415. NR 15 TC 7 Z9 7 U1 0 U2 1 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 487 EP 494 DI 10.1007/BF02922627 PG 8 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300045 PM 1929379 ER PT J AU BUNGAY, HR WATSON, JS AF BUNGAY, HR WATSON, JS TI BIOENGINEERING RESEARCH - INTRODUCTION SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Editorial Material C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP BUNGAY, HR (reprint author), RENSSELAER POLYTECH INST,TROY,NY 12181, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 497 EP 497 DI 10.1007/BF02922628 PG 1 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300046 ER PT J AU LEEPER, SA ANDREWS, GF AF LEEPER, SA ANDREWS, GF TI A CRITICAL-REVIEW AND EVALUATION OF BIOPRODUCTION OF ORGANIC-CHEMICALS SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 12TH SYMP ON BIOTECHNOLOGY FOR FUELS AND CHEMICALS CY MAY 07-11, 1990 CL GATLINBURG, TN SP US DOE, DIV BIOFUELS SYST, OAK RIDGE NATL LAB, SOLAR ENERGY RES INST, BADGER ENGINEERS, AMER CHEM SOC, DIV BIOCHEM TECHNOL DE BIOCONVERSION; CHEMICALS; FERMENTATION; ORGANICS; REVIEW ID BIOMASS; FEEDSTOCKS; ENERGY AB Dependence on petroleum as the primary feedstock for production of chemicals cannot continue indefinitely. Bioconversion could provide an alternate route to production of organic chemicals. A wide range of commodity chemicals and potentially new chemicals can be produced via bioconversion of biomass. However, before large-scale bioproduction of organic chemicals becomes a reality, issues related to economics, feedstock availability, environment, and energy requirements must be addressed. In this paper, these issues are discussed, and promising potential candidates for bioproduction are identified. Research needs are briefly addressed. RP LEEPER, SA (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 35 TC 14 Z9 14 U1 1 U2 3 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 499 EP 511 DI 10.1007/BF02922629 PG 13 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300047 ER PT J AU PETERSEN, JN DAVISON, BH AF PETERSEN, JN DAVISON, BH TI MODELING OF AN IMMOBILIZED-CELL 3-PHASE FLUIDIZED-BED BIOREACTOR SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 12TH SYMP ON BIOTECHNOLOGY FOR FUELS AND CHEMICALS CY MAY 07-11, 1990 CL GATLINBURG, TN SP US DOE, DIV BIOFUELS SYST, OAK RIDGE NATL LAB, SOLAR ENERGY RES INST, BADGER ENGINEERS, AMER CHEM SOC, DIV BIOCHEM TECHNOL DE FLUIDIZED-BED; IMMOBILIZED-CELL; VARIABLE DISPERSION; 3-PHASE ID ETHANOL-PRODUCTION; ZYMOMONAS-MOBILIS; FERMENTATION; REACTOR; PERFORMANCE; DIFFUSION; BEADS AB A mathematical model of a three-phase, tapered, fluidized-bed bioreactor has been developed. This model includes the effects of the tapered bed, a variable dispersion coefficient, and the concentration profile inside the biocatalyst bead on the reaction rate within the bed. Parameters in this model were obtained by adjusting them, within a realistic range, such that the square of the difference between the values predicted by the model and those obtained experimentally was minimized. The model was found to predict experimentally obtained concentration profiles quite accurately. It also demonstrates the need to include the effects of variable dispersion in three-phase systems where the gas phase is being generated inside the reactor, as the dispersion coefficient varied by more than an order of magnitude across the bed. C1 WASHINGTON STATE UNIV,DEPT CHEM ENGN,PULLMAN,WA 99164. OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831. RI Petersen, James/B-8924-2008; Davison, Brian/D-7617-2013 OI Davison, Brian/0000-0002-7408-3609 NR 15 TC 8 Z9 8 U1 0 U2 0 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 685 EP 698 DI 10.1007/BF02922642 PG 14 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300060 ER PT J AU SPINDLER, DD WYMAN, CE GROHMANN, K AF SPINDLER, DD WYMAN, CE GROHMANN, K TI THE SIMULTANEOUS SACCHARIFICATION AND FERMENTATION OF PRETREATED WOODY CROPS TO ETHANOL SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 12TH SYMP ON BIOTECHNOLOGY FOR FUELS AND CHEMICALS CY MAY 07-11, 1990 CL GATLINBURG, TN SP US DOE, DIV BIOFUELS SYST, OAK RIDGE NATL LAB, SOLAR ENERGY RES INST, BADGER ENGINEERS, AMER CHEM SOC, DIV BIOCHEM TECHNOL DE SIMULTANEOUS SACCHARIFICATION AND FERMENTATION (SSF); DILUTE ACID PRETREATMENT; WOODY CROPS; CELLULASE; BETA-GLUCOSIDASE ID YEAST STRAINS; CELLULOSE; HYDROLYSIS; CELLULASES; SELECTION AB Four promising woody crops (Populus maximowiczii x nigra (NE388), P. trichocarpa x deltoides (N11), P. tremuloides, and Sweetgum Liquidambar styraciflua) were pretreated by dilute sulfuric acid and evaluated in the simultaneous saccharification and fermentation (SSF) process for ethanol production. The yeast Saccharomyces cerevisiae was used in the fermentations alone, and in mixed cultures with beta-glucosidase producing Brettanomyces clausenii. Commercial Genencor 150L cellulase enyme was either employed alone or supplemented with beta-glucosidase. All SSFs were run at 37-degrees-C for 8 d and compared to saccharifications at 45-degrees-C under the same enzyme loadings. S. cerevisiae alone achieved the highest ethanol yields and rates of hydrolysis at the higher enzyme loadings, whereas the mixed culture performed better at the lower enzyme loadings without beta-glucosidase supplementation. The best overall rates of fermentation (3 d) and final theoretical ethanol yields (86-90%) were achieved with P. maximowiczii x nigra (NE388) and Sweetgum Liquidambar styraciflua, followed by P. tremuloides and P. trichocarpa x deltoides (N11) with slightly slower rates and lower yields. Although there were some differences in SSF performance, all these pretreated woody crops show promise as substrates for ethanol production. RP SPINDLER, DD (reprint author), SOLAR ENERGY RES INST,DIV FUELS & CHEM RES & ENGN,BIOTECHNOL RES BRANCH,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 24 TC 37 Z9 39 U1 1 U2 2 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 773 EP 786 DI 10.1007/BF02922648 PG 14 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300066 ER PT J AU NAWAZ, MS DAVIS, JW WOLFRAM, JH CHAPATWALA, KD AF NAWAZ, MS DAVIS, JW WOLFRAM, JH CHAPATWALA, KD TI DEGRADATION OF ORGANIC CYANIDES BY PSEUDOMONAS-AERUGINOSA SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 12TH SYMP ON BIOTECHNOLOGY FOR FUELS AND CHEMICALS CY MAY 07-11, 1990 CL GATLINBURG, TN SP US DOE, DIV BIOFUELS SYST, OAK RIDGE NATL LAB, SOLAR ENERGY RES INST, BADGER ENGINEERS, AMER CHEM SOC, DIV BIOCHEM TECHNOL DE ACETONITRILE; BIODEGRADATION; NITRILE AMINOHYDROLASE; AMIDASE ID NITRILE HYDRATASE; PURIFICATION; ACETONITRILE; J-1 AB A bacterium capable of utilizing acetonitrile (methyl cyanide) as the sole source of carbon and nitrogen was isolated from soil and identified as Pseudomonas aeruginosa. This bacterium could also utilize and oxidize numerous lower-mol-wt nitrile compounds and their corresponding amides as growth substrates. A metabolite of acetonitrile in the culture medium was determined to be ammonia. The accumulation of ammonia in the culture medium was proportional to the concentration of the substrate and the inoculum. Cell extracts of the bacterium contained activities corresponding to nitrile aminohydrolase (E C 3.5.5.1) and amidase (E C 3.5.1.4), which regulate the degradation of acetonitrile. Both enzymes were inducible and hydrolyzed a wide range of substrates, and it was determined that the specific activity of amidase was far greater than the activity of nitrile aminohydrolase. C1 EG&G IDAHO INC,INEL,BIOTECHNOL,IDAHO FALLS,ID 83415. RP CHAPATWALA, KD (reprint author), SELMA UNIV,DIV NAT SCI,SELMA,AL 36701, USA. FU NCRR NIH HHS [RR 08169] NR 16 TC 20 Z9 20 U1 0 U2 1 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 865 EP 875 DI 10.1007/BF02922656 PG 11 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300074 PM 1929388 ER PT J AU ENG, W PALUMBO, AV SRIHARAN, S STRANDBERG, GW AF ENG, W PALUMBO, AV SRIHARAN, S STRANDBERG, GW TI METHANOL SUPPRESSION OF TRICHLOROETHYLENE DEGRADATION BY METHYLOSINUS-TRICHOSPORIUM (OB3B) AND METHANE-OXIDIZING MIXED CULTURES SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 12TH SYMP ON BIOTECHNOLOGY FOR FUELS AND CHEMICALS CY MAY 07-11, 1990 CL GATLINBURG, TN SP US DOE, DIV BIOFUELS SYST, OAK RIDGE NATL LAB, SOLAR ENERGY RES INST, BADGER ENGINEERS, AMER CHEM SOC, DIV BIOCHEM TECHNOL DE BIODEGRADATION; TRICHLOROETHYLENE; METHANOTROPH; METHANOL; METHANE ID OBLIGATE METHANOTROPH; METABOLIC-ACTIVATION; UTILIZING BACTERIA; OXIDATION; BIODEGRADATION; LIVER; MICROSOMES AB The effect of methanol on trichloroethylene (TCE) degradation by mixed and pure methylotrophic cultures was examined in batch culture experiments. Methanol was found to relieve growth inhibition of Methylosinus trichosporium (OB3b) at high (14 mg/L) TCE concentrations. Degradation of TCE was determined by both radiolabeling and gas chromatography techniques. When cultures were grown on methanol over 10 to 14 d with 0.3 mg/L TCE, OB3b degraded 16.89 +/- 0.82% (mean +/- SD) of the TCE, and a mixed culture (DT type II) degraded 4.55 +/- 0.11%. Mixed culture (JS type I) degraded 4.34 +/- 0.06% of the TCE. When grown on methane with 0.3 mg/L TCE, 32.93 +/- 2.01% of the TCE was degraded by OB3b, whereas the JS culture degraded 24.3 +/- 1.38% of the TCE, and the DT culture degraded 34.3 +/- 2.97% of the TCE. The addition of methanol to cultures grown on methane reduced TCE degradation to 16.21 +/- 1.17% for OB3b and to 5.08 +/- 0.56% for JS. Although methanol reduces the toxicity of TCE to the cultures, biodegradation of TCE cannot be sustained in methanol-grown cultures. Since high TCE concentrations appear to inhibit methane uptake and growth, we suggest the primary toxicity of TCE is directed towards the methane monooxygenase. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT MICROBIOL,KNOXVILLE,TN 37996. SELMA UNIV,SELMA,AL 36701. OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831. RI Palumbo, Anthony/A-4764-2011 OI Palumbo, Anthony/0000-0002-1102-3975 NR 21 TC 4 Z9 4 U1 1 U2 2 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 887 EP 899 DI 10.1007/BF02922658 PG 13 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300076 PM 1929390 ER PT J AU TYNDALL, RL IRONSIDE, KS LITTLE, CD KATZ, DS KENNEDY, JR AF TYNDALL, RL IRONSIDE, KS LITTLE, CD KATZ, DS KENNEDY, JR TI FREE-LIVING AMEBAS USED TO ISOLATE CONSORTIA CAPABLE OF DEGRADING TRICHLOROETHYLENE SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article; Proceedings Paper CT 12TH SYMP ON BIOTECHNOLOGY FOR FUELS AND CHEMICALS CY MAY 07-11, 1990 CL GATLINBURG, TN SP US DOE, DIV BIOFUELS SYST, OAK RIDGE NATL LAB, SOLAR ENERGY RES INST, BADGER ENGINEERS, AMER CHEM SOC, DIV BIOCHEM TECHNOL DE FREE-LIVING AMEBAS; BACTERIA; CONSORTIA; TRICHLOROETHYLENE DEGRADATION ID LEGIONELLA-PNEUMOPHILA; AMEBAS; BIODEGRADATION; ENDOSYMBIONTS; CULTIVATION; PROTOZOA; SOIL C1 UNIV TENNESSEE,DEPT ZOOL,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RP TYNDALL, RL (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831, USA. NR 24 TC 3 Z9 3 U1 0 U2 2 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP 917 EP 925 DI 10.1007/BF02922661 PG 9 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300079 PM 1929393 ER PT J AU GREENBAUM, E AF GREENBAUM, E TI INTRODUCTION TO THE PROCEEDINGS OF THE 12TH SYMPOSIUM ON BIOTECHNOLOGY FOR FUELS AND CHEMICALS SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Editorial Material C1 SOLAR ENERGY RES INST,GOLDEN,CO 80401. RP GREENBAUM, E (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37830, USA. NR 14 TC 0 Z9 0 U1 0 U2 0 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD SPR PY 1991 VL 28-9 BP R4 EP R5 PG 2 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FM093 UT WOS:A1991FM09300001 ER PT J AU TENGERDY, RP RHO, WH MOHAGHEGHI, AM AF TENGERDY, RP RHO, WH MOHAGHEGHI, AM TI LIQUID FLUIDIZED-BED STARTER CULTURE OF TRICHODERMA-REESEI FOR CELLULASE PRODUCTION SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Article DE CELLULASE, PRODUCTION; LIQUID FLUIDIZED BED REACTOR (LFBR); TRICHODERMA-REESEI, IN CELLULOSE FERMENTATION; CELLULOSE, AS SUBSTRATE FOR FERMENTATION; CORN COB, AS CARRIER IN LFBR AB A starter culture of Trichoderma reesei (Rut-C30) prepared in a liquid fluidized bed reactor (LFBR) gave better growth and greater cellulase production in submerged fermentation than a conventional shake flask inoculum. The LFBR starter was prepared by first coating T. reesei spores to 0.25 mm size corncob (1.0 x 10(8)g-1) in a medium containing 1.0% corncob, 0.5 gL-1 xylose and 0.1 gL-1 lactose in a balanced salt solution, then fluidizing the particles in the LFBR for 36 h to allow germination of the spores, and covering the particles with an approx 30-mu-m thick biofilm. This biofilm that developed in constant adherence to the lignocellulosic carrier, apparently became well adapted to grow rapidly on insoluble cellulose substrates (Solca Floc), and had the enzymes of the cellulase complex induced for increased cellulase production. The LFBR starter used in a stirred tank reactor (STR) gave 15 gL-1 biomass production and 6.5 IU mL-1 overall cellulase activity with a volumetric productivity of 64 IU L-1h-1 in a 5 d fermentation, compared with a 7 d shake flask inoculum that gave 11 gL-1 biomass and 3.2 IU mL-1 cellulase activity, with a volumetric productivity of 31 IU L-1h-1. The LFBR starter culture retained its viability in dry storage for 6-9 mo. C1 SOLAR ENERGY RES INST,BIOTECHNOL BRANCH,GOLDEN,CO 80401. RP TENGERDY, RP (reprint author), COLORADO STATE UNIV,DEPT MICROBIOL,FT COLLINS,CO 80523, USA. NR 10 TC 7 Z9 8 U1 0 U2 0 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD MAR PY 1991 VL 27 IS 3 BP 195 EP 204 DI 10.1007/BF02921535 PG 10 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FF990 UT WOS:A1991FF99000001 ER PT J AU LENHART, S STOJANOVIC, S PROTOPOPESCU, V AF LENHART, S STOJANOVIC, S PROTOPOPESCU, V TI VARIATIONAL APPROACH FOR COMPETITIVE-SYSTEMS WITH OBSTACLES SO APPLIED MATHEMATICS AND COMPUTATION LA English DT Article AB We prove existence and uniqueness results for competitive systems consisting of two parabolic equations supplemented with positivity constraints. The coupling terms include local and nonlocal interaction terms. Monotone iteration schemes are used to obtain solutions in a variational approach. The solutions of the system are compared with the solution of a simplified ordinary differential system. C1 UNIV TENNESSEE,DEPT MATH,KNOXVILLE,TN 37996. UNIV CINCINNATI,DEPT MATH,CINCINNATI,OH 45221. RP LENHART, S (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0096-3003 J9 APPL MATH COMPUT JI Appl. Math. Comput. PD MAR PY 1991 VL 42 IS 1 BP 65 EP 83 DI 10.1016/0096-3003(91)90113-2 PG 19 WC Mathematics, Applied SC Mathematics GA FA758 UT WOS:A1991FA75800003 ER PT J AU IRGOLIC, KJ SPALL, D PURI, BK ILGER, D ZINGARO, RA AF IRGOLIC, KJ SPALL, D PURI, BK ILGER, D ZINGARO, RA TI DETERMINATION OF ARSENIC AND ARSENIC COMPOUNDS IN NATURAL-GAS SAMPLES SO APPLIED ORGANOMETALLIC CHEMISTRY LA English DT Article DE NATURAL GAS; ARSENIC; TRIMETHYLARSINE; DIMETHYLETHYLARSINE; METHYLDIETHYLARSINE; TRIETHYLARSINE; EXTRACTION; NITRIC ACID; ANALYSIS AB Organic arsenic compounds (trialkylarsines) present in natural gas were extracted by 10 cm3 of concentrated nitric acid from 1 dm3 of gas kept at ambient pressure and temperature. The flask containing the gas and the acid was shaken for 1 h on a platform shaker set at the highest speed. The resulting solution was mixed with concentrated sulfuric acid and heated to convert all arsenic compounds to arsenate. Total arsenic was determined in the mineralized solutions by hydride generation. The arsenic concentrations in natural gas samples from a number of wells in several gas fields were in the range 0.01-63-mu-g As dm-3. Replicate determinations of arsenic in a gas sample with an arsenic concentration of 5.9-mu-g dm-3 had a relative standard deviation of 1.7%. Because of the high blank values, the lowest arsenic concentration that could be reliably determined was 5 ng As dm-3 gas. Analysis of nonmineralized extracts by hydride generation identified trimethylarsine as the major arsenic compound in natural gas. Low-temperature gas chromatography-mass spectrometry showed more directly than the hydride generation technique, that trimethylarsine accounts for 55-80% of the total arsenic in several gas samples. Dimethylethylarsine, methyldiethylarsine, and triethylarsine were also identified, in concentrations decreasing with increasing molecular mass of the arsines. C1 GRAZ UNIV,INST ANALYT CHEM,A-8010 GRAZ,AUSTRIA. TEXAS A&M UNIV SYST,DEPT CHEM,COLLEGE STN,TX 77843. UNIV CALIF LOS ALAMOS SCI LAB,ANALYT CHEM GRP,LOS ALAMOS,NM 87545. NR 8 TC 20 Z9 20 U1 1 U2 3 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0268-2605 J9 APPL ORGANOMET CHEM JI Appl. Organomet. Chem. PD MAR-APR PY 1991 VL 5 IS 2 BP 117 EP 124 DI 10.1002/aoc.590050209 PG 8 WC Chemistry, Applied; Chemistry, Inorganic & Nuclear SC Chemistry GA FL386 UT WOS:A1991FL38600010 ER PT J AU KIMBRELL, SM YEUNG, ES AF KIMBRELL, SM YEUNG, ES TI SPATIAL AND TEMPORAL DISTRIBUTIONS OF LARGE MOLECULES IN PLUMES GENERATED BY LASER DESORPTION SO APPLIED SPECTROSCOPY LA English DT Article DE LASERS; SURFACE ANALYSIS; SPECTROSCOPIC TECHNIQUES; TIME-RESOLVED SPECTROSCOPY ID INDUCED THERMAL-DESORPTION; MASS-SPECTROMETRY; ORGANIC-MOLECULES; VOLATILIZATION; IONIZATION; PHASE AB To understand the laser desorption process for large molecules, one needs information about the neutral species that are formed. For absorbing dye molecules, this can be accomplished by imaging the plume over its lifetime of a few milliseconds with a probe laser. Using this novel technique, we have investigated the dependence of the formation of neutral gas-phase dye molecules on vaporization laser power. It is clear that destruction of the chromophore (fragmentation) occurs even at low vaporization powers. C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 26 TC 12 Z9 12 U1 0 U2 1 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA PO BOX 1438, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD MAR-APR PY 1991 VL 45 IS 3 BP 442 EP 447 DI 10.1366/0003702914337326 PG 6 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA FE161 UT WOS:A1991FE16100019 ER PT J AU Wolff, JO Cicirello, DM AF Wolff, Jerry O. Cicirello, Donna M. TI Comparative paternal and infanticidal behavior of sympatric white-footed mice (Peromyscus leucopus noveboracensis) and deermice (P. maniculatus nubiterrae) SO BEHAVIORAL ECOLOGY LA English DT Article AB We studied parental and infanticidal behavior in the field and laboratory in two ecologically equivalent and sympatric congeners, white-footed mice, Peromyscus leucopus noveboracensis, and deermice, P. maniculatus nubiterrae. Despite their close phylogenetic relationship and ecological similarity, various aspects of parental and nesting behavior of the two species were significantly different. P. maniculatus males were more paternal than were P. leucopus males in that they retrieved pups, nested with pregnant females and females with newborn pups, and formed longer associations with females than did P. leucopus males. Thus, P. m. nubiterrae exhibited more pair-bonding (monogamous) characteristics than did either P. leucopus or P. m. bairdi, as reported in other studies. The behavioral differences may represent the different evolutionary history of the three subspecies. Infanticidal behavior, however, was similar in both species. Dispersing and unmated males killed strange pups placed in experimental test chambers in the field, whereas mated males did not kill pups within their own home ranges. Resident females of both species were more infanticidal than were males, killing pups in 90% of the trials. The results support the sexual selection and resource competition hypotheses for male and female infanticide, respectively. [Behav Ecol 1991; 2: 3 8-45] C1 [Wolff, Jerry O.] Univ Georgia, Savannah River Ecol Lab, Aiken, SC 29802 USA. [Cicirello, Donna M.] Michigan State Univ, Kellogg Biol Stn, Hickory Corners, MI 49060 USA. RP Wolff, JO (reprint author), Univ Georgia, Savannah River Ecol Lab, Aiken, SC 29802 USA. FU NSF [88-15044]; U.S. Department of Energy and the Institute of Ecology of the University of Georgia [DE-AC09-76SR00-819] FX This work was supported by NSF Grant 88-15044 and contract DE-AC09-76SR00-819 between the U.S. Department of Energy and the Institute of Ecology of the University of Georgia. We thank two anonymous reviewers and D. Kramer for helpful comments on the manuscript. In this study, care was taken to minimize the pain and suffering of test animals according to the Guidelines of the Association for the Study of Animal Behaviour. The field infanticide studies did not expose pups to anything that does not occur naturally. Lactating females frequently leave their pups unattended during normal foraging bouts. When pups are killed, it is done quickly by one or two bites to the back of the head. No pups were wounded or eaten alive. Surviving pups were returned to their mothers immediately after testing. NR 40 TC 45 Z9 47 U1 1 U2 8 PU OXFORD UNIV PRESS INC PI CARY PA JOURNALS DEPT, 2001 EVANS RD, CARY, NC 27513 USA SN 1045-2249 J9 BEHAV ECOL JI Behav. Ecol. PD SPR PY 1991 VL 2 IS 1 BP 38 EP 45 DI 10.1093/beheco/2.1.38 PG 8 WC Behavioral Sciences; Biology; Ecology; Zoology SC Behavioral Sciences; Life Sciences & Biomedicine - Other Topics; Environmental Sciences & Ecology; Zoology GA V09JK UT WOS:000207392500005 ER PT J AU MILLER, WH AF MILLER, WH TI SOME NEW APPROACHES TO SEMICLASSICAL AND QUANTUM TRANSITION-STATE THEORY SO BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS LA English DT Article; Proceedings Paper CT DISCUSSION MEETING OF THE DEUTSCHE-BUNSEN-GESELLSCHAFT-FUR-PHYSIKALISCHE-CHEMIE - RATE PROCESS IN DISSIPATIVE SYSTEMS : 50 YEARS AFTER KRAMERS CY SEP 10-13, 1990 CL TUTZING, FED REP GER SP DEUT BUNSEN GESELL PHYS CHEM, DEUT PHYS GESELL, NATO, USN, OFF NAVAL RES, EVANGELISCHE AKAD TUTZING DE CHEMICAL KINETICS; QUANTUM MECHANICS; RATE CONSTANTS; TRANSITION STATE THEORY ID RATE CONSTANTS; NONSEPARABLE SYSTEMS; EIGENVALUES; KRAMERS AB Semiclassical and quantum mechanical transition state theory is reviewed and two new approaches described. One is a general implementation of a semiclassical rate expression [Miller, Faraday Discuss. Chem. Soc. 62, 40 (1977)] that involves the "good" action-angle variables associated with the saddle point (i.e., transition state) of a potential energy surface. The other is an evaluation of a formally exact quantum expression for the rate [Miller, Schwartz, and Tromp, J. Chem. Phys. 79, 4889 (1983)] in terms of Siegert eigenvalues associated with the transition state. Siegert eigenvalues are usually associated with scattering resonances, so their identification with the saddle point of a potential surface, and the expression for the reaction rate in terms of them, is quite an unexpected and novel development. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. RP MILLER, WH (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 22 TC 3 Z9 3 U1 2 U2 5 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0005-9021 J9 BER BUNSEN PHYS CHEM JI Ber. Bunsen-Ges. Phys. Chem. Chem. Phys. PD MAR PY 1991 VL 95 IS 3 BP 389 EP 393 PG 5 WC Chemistry, Physical SC Chemistry GA FK369 UT WOS:A1991FK36900029 ER PT J AU BUDIL, DE THURNAUER, MC AF BUDIL, DE THURNAUER, MC TI THE CHLOROPHYLL TRIPLET-STATE AS A PROBE OF STRUCTURE AND FUNCTION IN PHOTOSYNTHESIS SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Review DE CHLOROPHYLL; TRIPLET STATE; PHOTOSYNTHESIS ID ELECTRON-SPIN-RESONANCE; DETECTED MAGNETIC-RESONANCE; VIRIDIS REACTION CENTERS; RHODOPSEUDOMONAS-SPHAEROIDES R-26; PRIMARY-CHARGE-SEPARATION; I REACTION CENTER; ABSORBANCE-DIFFERENCE SPECTRA; BACTERIAL REACTION CENTERS; PHOTO-EXCITED TRIPLETS; PRIMARY RADICAL PAIR C1 ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. RP BUDIL, DE (reprint author), CORNELL UNIV, BAKER LAB CHEM, ITHACA, NY 14850 USA. RI Budil, David/A-9931-2012 OI Budil, David/0000-0003-2384-7928 FU NIGMS NIH HHS [GM-12924] NR 442 TC 97 Z9 102 U1 1 U2 21 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0006-3002 J9 BIOCHIM BIOPHYS ACTA JI Biochim. Biophys. Acta PD MAR 1 PY 1991 VL 1057 IS 1 BP 1 EP 41 DI 10.1016/S0005-2728(05)80081-7 PG 41 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA FD725 UT WOS:A1991FD72500001 PM 1849002 ER PT J AU BIRNBAUM, D SELTZER, S AF BIRNBAUM, D SELTZER, S TI THE SECONDARY BETA-DEUTERIUM ISOTOPE EFFECT IN DARK-ADAPTATION OF BACTERIORHODOPSIN CONTAINING RETINAL-20,20,20-D3 SO BIOORGANIC CHEMISTRY LA English DT Article ID CIS-TRANS ISOMERIZATION; SCHIFF-BASE; HALOBACTERIUM-HALOBIUM; ADAPTED BACTERIORHODOPSIN; ONE-STEP; PROTON; CHROMOPHORE; RHODOPSIN; LOCATION; EXCHANGE C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 40 TC 6 Z9 6 U1 1 U2 3 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0045-2068 J9 BIOORG CHEM JI Bioorganic Chem. PD MAR PY 1991 VL 19 IS 1 BP 18 EP 28 DI 10.1016/0045-2068(91)90040-V PG 11 WC Biochemistry & Molecular Biology; Chemistry, Organic SC Biochemistry & Molecular Biology; Chemistry GA FB725 UT WOS:A1991FB72500003 ER PT J AU DAIRKEE, SH HACKETT, AJ AF DAIRKEE, SH HACKETT, AJ TI DIFFERENTIAL RETENTION OF RHODAMINE-123 BY BREAST-CARCINOMA AND NORMAL HUMAN MAMMARY TISSUE SO BREAST CANCER RESEARCH AND TREATMENT LA English DT Note DE DYE INFUSION; FLUORESCENCE; HUMAN MAMMARY GLAND; MALIGNANCY ID CELLS; MITOCHONDRIAL; INVIVO AB We have qualitatively evaluated the retention of the fluorescent dye rhodamine 123 by malignant or non-malignant breast epithelial cells in passively-infused fresh surgical specimens. Our findings demonstrate a microscopically-visible increase in the ability of primary and metastatic tumor cells to retain the dye, as compared to non-malignant epithelium. Some variability in fluorescence intensity was seen within and between tumor specimens. The optimal length of incubation in the presence of the dye was critical in achieving differential fluorescence intensity between normal and malignant cells. This method of examining rhodamine 123 uptake and retention in tissue explants provides a reliable means for direct, comparative visualization in situ of any tissue and its associated disorders. The results of this study also demonstrate the validity of extending the use of lipophilic, cationic compounds such as rhodamine 123 as antitumor agents, from model systems to the treatment of malignant disease. C1 PERALTA CANC RES INST,OAKLAND,CA. RP DAIRKEE, SH (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV CELLULAR & MOLEC BIOL,MS 934-47A,BERKELEY,CA 94720, USA. RI Dairkee, Shanaz/D-6743-2012 NR 13 TC 34 Z9 34 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0167-6806 J9 BREAST CANCER RES TR JI Breast Cancer Res. Treat. PD MAR PY 1991 VL 18 IS 1 BP 57 EP 61 DI 10.1007/BF01975444 PG 5 WC Oncology SC Oncology GA FH737 UT WOS:A1991FH73700008 PM 1854980 ER PT J AU LEVEN, RM RODRIGUEZ, A AF LEVEN, RM RODRIGUEZ, A TI IMMUNOMAGNETIC BEAD ISOLATION OF MEGAKARYOCYTES FROM GUINEA-PIG BONE-MARROW - EFFECT OF RECOMBINANT INTERLEUKIN-6 ON SIZE, PLOIDY AND CYTOPLASMIC FRAGMENTATION SO BRITISH JOURNAL OF HAEMATOLOGY LA English DT Article ID THROMBOCYTOPENIA; THROMBOPOIETIN; INVITRO; MICE AB Guinea-pig bone marrow megakaryocytes were isolated using an antibody to platelet glycoprotein Ib and a second antibody conjugated to magnetic beads. The procedure yielded an average of 644 800 megakaryocytes from two guinea-pigs with an average viability of 83%. All of the platelet glycoprotein Ib positive cells also expressed the platelet glycoprotein IIb-IIIa complex. The size and ploidy of megakaryocytes isolated by this technique were analysed in the presence of 10 ng/ml of interleukin-6 (IL-6). Without IL-6 megakaryocyte size increased significantly after 24 h, but an even larger increase in size occurred in the presence of IL-6. The modal ploidy class was 16N with an average of 19% 2N, 2.6% 4N, 16.4% 8N, 50.8% 16N and 11.1% 32N cells as determined by flow cytometry. Measurements made by microspectrophotometry were in close agreement. After 24 h incubation there was a significant rise in the percentage of 2N and 32N cells. The ploidy distribution after 24 h with IL-6 was the same as the control. Megakaryocytes cultured in the absence of serum on collagen gels did not form pseudopods and fragment, as occurs with serum (Leven et al, 1987). Addition of IL-6 to the serum-free cultures caused megakaryocytes to form extensive proplatelet extensions. We conclude that large numbers of pure guinea-pig bone marrow megakaryocytes can be isolated by immunomagnetic bead selection, including low ploidy immature megakaryocytes. Spontaneous maturation occurred as evidenced by the increase in megakaryocyte size and ploidy. IL-6 altered megakaryocyte size and morphology but not ploidy, indicating that these different characteristics of megakaryocytes may be regulated separately. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV RES MED & RADIAT BIOL,BERKELEY,CA 94720. FU NHLBI NIH HHS [HL 38248] NR 25 TC 27 Z9 28 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0007-1048 J9 BRIT J HAEMATOL JI Br. J. Haematol. PD MAR PY 1991 VL 77 IS 3 BP 267 EP 273 DI 10.1111/j.1365-2141.1991.tb08569.x PG 7 WC Hematology SC Hematology GA FA808 UT WOS:A1991FA80800002 PM 2012749 ER PT J AU KENNEL, SJ FALCIONI, R WESLEY, JW AF KENNEL, SJ FALCIONI, R WESLEY, JW TI MICRODISTRIBUTION OF SPECIFIC RAT MONOCLONAL-ANTIBODIES TO MOUSE-TISSUES AND HUMAN TUMOR XENOGRAFTS SO CANCER RESEARCH LA English DT Article ID BLOOD-FLOW; PROTEIN; QUANTITATION; STABILITY; PRESSURE; ANTIGEN; BINDING; INVIVO AB Detailed evaluations of the microdistribution of I-125-labeled monoclonal antibodies (MoAbs) to normal tissue antigens were conducted in BALB/c mice. MoAb 273-34A, which binds to a target molecule on the lumenal surface of lung endothelial cells, localizes quickly and efficiently throughout the lung vasculature. MoAb 133-13A, which binds to an antigen on macrophage-like cells expressed in nearly equal amounts in lung, liver, and spleen, localizes most efficiently to spleen and less well to liver and lung. The microdistribution of MoAb 133-13A in liver and spleen is consistent with the antigen distribution in these organs, but in the lung a more diffuse microdistribution is observed, indicating poor access of MoAb to the antigen-positive alveolar macrophages. These findings are consistent with the hypothesis that tight endothelium (lung) represents a significant barrier to extravasation of MoAb into tissue while fenestrated (spleen) and sinusoidal (liver) endothelium are more easily penetrated. In human tumor bearing nu/nu mice, the microdistribution of MoAb to the beta-4 and alpha-6 subunits of integrin was studied. These MoAbs do not cross-react with murine integrins and thus are tumor-specific in the nu/nu mouse model. Localization of I-125-labeled MoAb 450-11A, which reacts with an intercellular domain of beta-4 integrin, is very weak and diffuse. All MoAbs to extracellular domains (mouse 450-9D, 450-30A1, and rat 439-9B) localize well to the tumor. Microdistribution of these MoAbs in the 3 different tumors is nonuniform with heavy distribution near the blood vessels, whereas antigen distribution as determined by immunoperoxidase shows a much more uniform pattern throughout the tumors. In experiments with I-125-labeled MoAb 439-9B F(ab')2, the nonuniform pattern of distribution was not changed. Gross and microdistribution of different doses of I-125-labeled MoAb 439-9B were studied. The percent of injected dose per g of MoAb in the tumor at 48 h did not vary significantly (P > 0.1) up to a dose of 500-mu-g/mouse, and active MoAb was recovered in comparable amounts in the serum from animals in all doses. In contrast, the microdistribution of MoAb at the high dose was different than that at low doses. At doses up to 100-mu-g/mouse, a perivascular pattern was obtained, whereas at 500-mu-g/mouse the I-125-labeled MoAb was distributed nearly evenly throughout the tumor. These data indicate that high doses of MoAb penetrate deeply into portions of the tumor that are distant from blood vessels. These data are consistent with the hypothesis that even when MoAbs have penetrated the vessel walls, movement throughout the tumor is restricted. High doses of MoAb overcome this restriction and generate a more uniform MoAb distribution. RP KENNEL, SJ (reprint author), OAK RIDGE NATL LAB,DIV BIOL,POB 2009,OAK RIDGE,TN 37831, USA. NR 35 TC 62 Z9 64 U1 1 U2 1 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 MAR 1 PY 1991 VL 51 IS 5 BP 1529 EP 1536 PG 8 WC Oncology SC Oncology GA EZ618 UT WOS:A1991EZ61800029 PM 1997194 ER PT J AU RAZA, A MILLER, MA MAZEWSKI, C SHEIKH, Y LAMPKIN, B SAWAYA, R CRONE, K BERGER, T REISING, J GRAY, J KHAN, S PREISLER, H AF RAZA, A MILLER, MA MAZEWSKI, C SHEIKH, Y LAMPKIN, B SAWAYA, R CRONE, K BERGER, T REISING, J GRAY, J KHAN, S PREISLER, H TI OBSERVATIONS REGARDING DNA-REPLICATION SITES IN HUMAN-CELLS INVIVO FOLLOWING INFUSIONS OF IODODEOXYURIDINE AND BROMODEOXYURIDINE SO CELL PROLIFERATION LA English DT Article ID ACUTE NONLYMPHOCYTIC LEUKEMIA; CYCLE CHARACTERISTICS; INTERPHASE NUCLEI; LABELING INDEX; MEMBRANE; KINETICS; MUCOSA; ANLL AB In studies using bromodeoxyuridine (BrdUrd) and/or iododeoxyuridine (IdUrd) to label S phase cells in cancer patients, several unique observations were made regarding DNA replication sites and the organization of newly synthesized DNA in post-mitotic cells. While the majority of tumour specimens removed at the end of infusions demonstrated concentration of replication sites around the nuclear membrane, biopsies obtained in leukaemic patients 1 week later demonstrated several distinct patterns of labelling. For example, one, two or all lobes of granulocytes were labelled. Scavenger macrophages bearing labelled leukaemic cells in their cytoplasm were also seen. Sequential IdUrd/BrdUrd labelling of solid tumours showed various patterns of nuclear/nucleolar/membrane labelling, allowing more precise localization of early versus late replication sites. C1 UNIV CINCINNATI,MED CTR,CHILDRENS HOSP,CINCINNATI,OH 45267. UNIV CINCINNATI,MED CTR,DEPT NEUROSURG,CINCINNATI,OH 45267. UNIV CINCINNATI,MED CTR,DEPT THORAC SURG,CINCINNATI,OH 45267. NEW YORK STATE DEPT HLTH,ROSWELL PK MEM INST,BUFFALO,NY 14263. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP RAZA, A (reprint author), UNIV CINCINNATI,MED CTR,BARRETT CANC CTR,231 BETHESDA AVE,MAIL LOCAT 508,CINCINNATI,OH 45267, USA. NR 40 TC 15 Z9 15 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0960-7722 J9 CELL PROLIFERAT JI Cell Prolif. PD MAR PY 1991 VL 24 IS 2 BP 113 EP 126 DI 10.1111/j.1365-2184.1991.tb01143.x PG 14 WC Cell Biology SC Cell Biology GA FE363 UT WOS:A1991FE36300001 PM 2009317 ER PT J AU MILLER, DR ALLISON, DP RORVIK, MC SLAGA, TJ AF MILLER, DR ALLISON, DP RORVIK, MC SLAGA, TJ TI INHIBITED MORPHOLOGICAL TERMINAL DIFFERENTIATION AND ENHANCED PROLIFERATION OF CULTURED MOUSE EPIDERMAL-CELLS AT DIFFERENT CONCENTRATIONS OF DIMETHYL-SULFOXIDE SO CELL PROLIFERATION LA English DT Article ID TUMOR PROMOTERS; MELANOMA-CELLS; CALCIUM-IONS; CYCLIC-AMP; SULFOXIDE; KERATINOCYTES; DIMETHYLSULFOXIDE; INVITRO; GROWTH; DMSO AB Dimethyl sulphoxide (DMSO), at concentrations of 1-2%, induces terminal differentiation in several different cell types in vitro and enhances the growth of newborn mouse epidermal cells in primary culture under conditions that also permit terminal differentiation. We have found that DMSO concentrations approaching 4% reversibly inhibited (with little overt toxicity) terminal differentiation of normal epidermal cells from newborn SENCAR mice. Cells cultured in medium containing 4% DMSO and calcium in excess of 1 mM did not stratify extensively or slough large amounts of keratinized debris into the medium as occurred in control cultures, nor did they form large numbers of squamous cells or keratin bundles, as revealed by light and electron microscopy. The number of detergent-insoluble cornified envelopes was similarly reduced. Long-term growth of epidermal colonies in secondary culture was optimum in 1% DMSO, this concentration also permitting normal terminal differentiation of these cells. Since DMSO had these effects on epidermal cells in vitro, it may also affect epidermal cell proliferation and terminal differentiation in vivo, an important consideration should DMSO ever be approved for topical use in the US. C1 HARVARD UNIV,SCH MED,BRIGHAM CHILDRENS DIV PLAST SURG,BOSTON,MA 02115. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37830. UNIV TEXAS,CTR CANC,SMITHVILLE,TX 78957. RI Ain, Kenneth/A-5179-2012 OI Ain, Kenneth/0000-0002-2668-934X FU NCI NIH HHS [CA-20076, CA-34890, CA-34962] NR 48 TC 10 Z9 10 U1 0 U2 2 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0960-7722 J9 CELL PROLIFERAT JI Cell Prolif. PD MAR PY 1991 VL 24 IS 2 BP 191 EP 210 DI 10.1111/j.1365-2184.1991.tb01149.x PG 20 WC Cell Biology SC Cell Biology GA FE363 UT WOS:A1991FE36300007 PM 1706945 ER PT J AU NOVOA, JJ WHANGBO, MH WILLIAMS, JM AF NOVOA, JJ WHANGBO, MH WILLIAMS, JM TI INTERACTION ENERGIES ASSOCIATED WITH SHORT INTERMOLECULAR CONTACTS OF C-H BONDS - STRUCTURE AND ENERGETICS OF THE INTERACTION BETWEEN CH4 AND CN- SO CHEMICAL PHYSICS LETTERS LA English DT Article ID ION-CYCLOTRON RESONANCE; BASIS SET; ANIONS AB On the basis of SCF and single reference MP2 calculations, the full potential energy surface of the interaction between CH4 and CN- was studied using extended basis sets of up to near Hartree-Fock limit quality. Collinear arrangements C-N-...H-CH3 and N-C-...H-CH3 are found to be the only two energy minima. The binding energies of these two structures are calculated to be 2.5 and 2.1 kcal/mol, respectively, at the MP2 level. The full vibrational analyses of the two structures show a red-shift of about 30 cm-1 for the nu-s C-H stretching. C1 ARGONNE NATL LAB,DIV CHEM & MAT SCI,ARGONNE,IL 60439. RP NOVOA, JJ (reprint author), N CAROLINA STATE UNIV,DEPT CHEM,RALEIGH,NC 27695, USA. RI Novoa, Juan/B-3525-2013 OI Novoa, Juan/0000-0003-3577-1182 NR 19 TC 6 Z9 6 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 MAR 1 PY 1991 VL 177 IS 4-5 BP 483 EP 490 DI 10.1016/0009-2614(91)85088-E PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FA223 UT WOS:A1991FA22300024 ER PT J AU RYE, RR TALLANT, DR BOREK, TT LINDQUIST, DA PAINE, RT AF RYE, RR TALLANT, DR BOREK, TT LINDQUIST, DA PAINE, RT TI MECHANISTIC STUDIES OF THE CONVERSION OF BORAZINE POLYMERS TO BORON-NITRIDE SO CHEMISTRY OF MATERIALS LA English DT Article ID METAL-PROMOTED REACTIONS; B-ALKENYLBORAZINES; CERAMICS; PRECURSORS; PYROLYSIS; HYDRIDES AB The thermal chemistry of thin films of a borazinylamine polymer deposited on KOH-etched aluminum and sapphire has been examined by thermal decomposition mass spectroscopy, thermogravimetric analysis, and Raman spectroscopy. The majority of the gas evolution chemistry is found to occur below 400-degrees-C. All products desorb with the same temperature profile, and the major desorbing species are NH3 and N2 (polymer decomposition products) and HCl (side reaction products). The hydrogen remaining in the solid at 400-degrees-C (almost-equal-to 50%) is continuously lost from 400 to 1200-degrees-C. Facile ring-opening steps are evidenced by the complete isotope mixing that occurs for samples in which the ring nitrogens are labeled with N-15. With increasing pyrolysis temperature, the Raman spectra change from the characteristic of the polymer (25-degrees-C) to an intense featureless fluorescence spectrum (up to 400-degrees-C), to an intense three-peak resonance Raman spectrum (almost-equal-to 400 to 1200-degrees-C), and finally to a less intense Raman spectrum characteristic of h-BN superimposed on a fluorescence background at 1600-degrees-C. The implications of these observations to the pyrolysis mechanism are discussed. C1 UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. RP RYE, RR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 35 TC 30 Z9 31 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD MAR-APR PY 1991 VL 3 IS 2 BP 286 EP 293 DI 10.1021/cm00014a016 PG 8 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA FE932 UT WOS:A1991FE93200016 ER PT J AU TRYKA, AF WITSCHI, H AF TRYKA, AF WITSCHI, H TI MODULATION OF CELLULAR REPAIR RESPONSE PATTERNS SO CHEST LA English DT Article; Proceedings Paper CT 33RD ANNUAL THOMAS L PETTY ASPEN LUNG CONF : MECHANISMS OF LUNG REPAIR CY JUN 06-09, 1990 CL GIVEN INST PATHOBIOL, ASPEN, CO SP FRANCIS FAMILIES FDN, ALLEN & HANBURYS, BOEHRINGER INGELHEIM, FISONS, GENETECH, RORER PHARM, SCHERING, UPJOHN, ASPEN LUNG CONF ENDOWMENT FUND HO GIVEN INST PATHOBIOL ID OXYGEN; LUNG C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. RP TRYKA, AF (reprint author), UNIV ARKANSAS MED SCI HOSP,SLOT 517,LITTLE ROCK,AR 72205, USA. NR 11 TC 3 Z9 3 U1 0 U2 0 PU AMER COLL CHEST PHYSICIANS PI NORTHBROOK PA 3300 DUNDEE ROAD, NORTHBROOK, IL 60062-2348 SN 0012-3692 J9 CHEST JI Chest PD MAR PY 1991 VL 99 IS 3 SU S BP S28 EP S30 DI 10.1378/chest.99.3_Supplement.28S-a PG 3 WC Critical Care Medicine; Respiratory System SC General & Internal Medicine; Respiratory System GA FB305 UT WOS:A1991FB30500016 PM 1900043 ER PT J AU YAMAGISHI, K CHAPLINE, GF AF YAMAGISHI, K CHAPLINE, GF TI INDUCED 4D SELF-DUAL QUANTUM-GRAVITY - W-INFINITY ALGEBRAIC APPROACH SO CLASSICAL AND QUANTUM GRAVITY LA English DT Article ID EXTENDED VIRASORO ALGEBRAS; FIELD-THEORY; COADJOINT ORBITS; 2-D GRAVITY; H-SPACE; SYMMETRIES; CONSTRUCTION; INVARIANTS; METRICS AB We consider the functional integral quantization of the equation which describes a development of cross sections in a twistor space corresponding to self-dual gravity. At the classical level the system permits a local area-preserving diffeomorphism as its symmetry. Assuming W-triple-dot infinity algebra at the quantized level, we derive an effective action for this equation via the coadjoint orbit method. The result consists of an infinite sum of two-dimensional effective Lagrangians including infinitesimal Polyakov two-dimensional (light-cone gauge) gravity as its first term. The higher order terms are the result of the central extensions of W-triple-dot algebra associated with higher conformal-spin operators. RP YAMAGISHI, K (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,L-413,LIVERMORE,CA 94550, USA. NR 52 TC 23 Z9 23 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0264-9381 J9 CLASSICAL QUANT GRAV JI Class. Quantum Gravity PD MAR PY 1991 VL 8 IS 3 BP 427 EP 446 DI 10.1088/0264-9381/8/3/005 PG 20 WC Astronomy & Astrophysics; Physics, Multidisciplinary; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FB062 UT WOS:A1991FB06200005 ER PT J AU BENOWITZ, NL JACOB, P DENARO, C JENKINS, R AF BENOWITZ, NL JACOB, P DENARO, C JENKINS, R TI STABLE ISOTOPE STUDIES OF NICOTINE KINETICS AND BIOAVAILABILITY SO CLINICAL PHARMACOLOGY & THERAPEUTICS LA English DT Article ID CIGARETTE-SMOKING; METABOLISM; YIELDS; TAR AB The stable isotope-labeled compound 3',3'-dideuteronicotine was used to investigate the disposition kinetics of nicotine in smokers, the systemic absorption of nicotine from cigarette smoke, and the bioavailability of nicotine ingested as oral capsules. Blood levels of labeled nicotine could be measured for 9 hours after a 30-minute intravenous infusion. Analysis of disposition kinetics in 10 healthy men revealed a multiexponential decline after the end of an infusion, with an elimination half-life averaging 203 minutes. This half-life was longer than that previously reported, indicating the presence of a shallow elimination phase. Plasma clearance averaged 14.6 ml/min/kg. The average intake of nicotine per cigarette was 2.29 mg. A cigarette smoke-monitoring system that directly measured particulate matter in smoke was evaluated in these subjects. Total particulate matter, number of puffs on the cigarette, total puff volume, and time of puffing correlated with the intake of nicotine from smoking. The oral bioavailability of nicotine averaged 44%. This bioavailability is higher than expected based on the systemic clearance of nicotine and suggests that there may be significant extrahepatic metabolism of nicotine. C1 UNIV CALIF SAN FRANCISCO,DEPT MED,DIV CLIN PHARMACOL & EXPTL THERAPEUT,SAN FRANCISCO,CA 94143. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. FU NCRR NIH HHS [RR-00083]; NIDA NIH HHS [DA01696, DA02277] NR 27 TC 94 Z9 96 U1 0 U2 6 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0009-9236 J9 CLIN PHARMACOL THER JI Clin. Pharmacol. Ther. PD MAR PY 1991 VL 49 IS 3 BP 270 EP 277 PG 8 WC Pharmacology & Pharmacy SC Pharmacology & Pharmacy GA FE195 UT WOS:A1991FE19500008 PM 2007322 ER PT J AU MALONEY, DJ MONAZAM, ER WOODRUFF, SD LAWSON, LO AF MALONEY, DJ MONAZAM, ER WOODRUFF, SD LAWSON, LO TI MEASUREMENTS AND ANALYSIS OF TEMPERATURE HISTORIES AND SIZE CHANGES FOR SINGLE CARBON AND COAL PARTICLES DURING THE EARLY STAGES OF HEATING AND DEVOLATILIZATION SO COMBUSTION AND FLAME LA English DT Article ID ELECTRODYNAMIC BALANCE; MASS AB A novel system is described for monitoring rapid changes in particle size and temperature during coal devolatilization at heating rates representative of high-intensity combustion environments. The system incorporates an electrodynamic balance and a pulsed radiation source to isolate and rapidly heat individual particles. A high-speed two-dimensional photodiode array and a single wavelength radiation pyrometer are applied to record changes in particle size and temperature. Dynamics of volatile evolution and particle swelling are also recorded using high-speed cinematography. Measurements of temperature and size changes are reported for carbon spheres and a HVA bituminous coal at heating rates on the order of 10(5) K/s. Measured temperature histories are compared with theoretical estimates of the temperature response of radiatively heated coal and carbon particles. The analysis considers the development of the transient temperature distribution inside the particles by numerical solution of the Fourier equation. Measurements and model predictions for 135-mu-m-diameter carbon spheres were in excellent agreement using property data correlations commonly applied in modeling coal devolatilization and combustion behavior. Model predictions for coal particles, however, significantly underestimated (on the order of 50%) the observed heating rates for 115-mu-m-diameter coal particles using the same property correlations. It is concluded that coal particles heat significantly faster than is predicted using commonly employed approaches to model heat transfer with assumptions routinely applied to coal. Potential reasons for this may include inadequate understanding of relevant coal thermodynamic and heat transfer properties as well as failure to account for particle shape factors. Heat transfer analyses employing spherical particle assumptions and commonly used coal property correlations can lead to large errors in predicted temperature histories and associated devolatilization rates. RP MALONEY, DJ (reprint author), US DOE,MORGANTOWN ENERGY TECHNOL CTR,POB 880,MORGANTOWN,WV 26507, USA. NR 23 TC 18 Z9 19 U1 0 U2 4 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0010-2180 J9 COMBUST FLAME JI Combust. Flame PD MAR PY 1991 VL 84 IS 1-2 BP 210 EP 220 DI 10.1016/0010-2180(91)90049-H PG 11 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA FE940 UT WOS:A1991FE94000017 ER PT J AU LEE, P PASCIAK, JE PISSANETZKY, S AF LEE, P PASCIAK, JE PISSANETZKY, S TI PARALLEL COMPUTATION OF MAGNETIC-FIELDS SO COMPEL-THE INTERNATIONAL JOURNAL FOR COMPUTATION AND MATHEMATICS IN ELECTRICAL AND ELECTRONIC ENGINEERING LA English DT Article AB In this paper, a parallel preconditioning technique based on the additive variant of overlapping domain decomposition is described and implemented to solve magnetostatic field problems. This technique involves covering the domain with a number of overlapping subdomains. The preconditioner results from adding together approximate inversions on the subdomains. Theoretical estimates for the rate of convergence for the resulting algorithm are available and are based on the properties of underlying differential equations. Numerical experiments are given to demonstrate the effectiveness of this algorithm. C1 BROOKHAVEN NATL LAB, DEPT APPL SCI, UPTON, NY 11973 USA. TEXAS ACCELERATOR CTR, THE WOODLANDS, TX 77381 USA. RP SCHLUMBERGER LAB COMP SCI, 8311 N 620 RR, AUSTIN, TX 78720 USA. NR 20 TC 1 Z9 1 U1 0 U2 0 PU EMERALD GROUP PUBLISHING LTD PI BINGLEY PA HOWARD HOUSE, WAGON LANE, BINGLEY BD16 1WA, W YORKSHIRE, ENGLAND SN 0332-1649 J9 COMPEL JI Compel-Int. J. Comp. Math. Electr. Electron. Eng. PD MAR PY 1991 VL 10 IS 1 BP 45 EP 55 DI 10.1108/eb010329 PG 11 WC Computer Science, Interdisciplinary Applications; Engineering, Electrical & Electronic; Mathematics, Applied SC Computer Science; Engineering; Mathematics GA FX170 UT WOS:A1991FX17000004 ER PT J AU HUANG, S DAEHLING, K CARLESON, TE PROPP, A AF HUANG, S DAEHLING, K CARLESON, TE PROPP, A TI CONSTRUCTION AND CALIBRATION OF AN INTERNAL SILVER SILVER-CHLORIDE REFERENCE ELECTRODE FOR SUPERCRITICAL FLUID STUDIES SO CORROSION LA English DT Article DE CALIBRATION; ELECTROCHEMICAL CELL; EQUILIBRIUM POTENTIAL; HYDROCHLORIC ACID; HYDROGEN; POTENTIOSTATIC; PRESSURE; REFERENCE ELECTRODE; STANDARD ELECTRODE; SUPERCRITICAL; TEMPERATURE ID TEMPERATURE AQUEOUS ENVIRONMENTS; PH MEASUREMENTS; WATER; SYSTEMS; MEMBRANES AB An internal silver/silver chloride (0.1 M KCl) reference electrode was constructed and calibrated versus a hydrogen electrode under supercritical conditions. Solutions used for the calibration were 0.1 and 1.0 M HCl. An extrapolation method is discussed for calculating the mean ionic activity coefficients of HCl at elevated conditions. The standard potential of the reference electrode can be expressed as E-degrees = 0.4597 - 0.0006087T (volts) for temperatures from 300 to 750 K and pressures from 200 to 280 atm. C1 EG&G IDAHO INC, IDAHO FALLS, ID 83415 USA. RP HUANG, S (reprint author), UNIV IDAHO, DEPT CHEM ENGN, BUCHANAN ENGN LAB 308, MOSCOW, ID 83843 USA. NR 18 TC 2 Z9 4 U1 1 U2 7 PU NATL ASSOC CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 USA SN 0010-9312 EI 1938-159X J9 CORROSION-US JI Corrosion PD MAR PY 1991 VL 47 IS 3 BP 185 EP 188 PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FV887 UT WOS:A1991FV88700006 ER PT J AU EBERHARDT, LL THOMAS, JM AF EBERHARDT, LL THOMAS, JM TI DESIGNING ENVIRONMENTAL FIELD STUDIES SO ECOLOGICAL MONOGRAPHS LA English DT Article DE ANALYTICAL SAMPLING; EXPERIMENTAL DESIGN; FIELD EXPERIMENTS; INFERENCES; OBSERVATIONAL STUDIES; PATTERN; POPULATIONS; PSEUDOREPLICATION; SAMPLING DESIGN; SAMPLING FOR MODELING; TYPE-I AND TYPE-II ERRORS ID POPULATION; PSEUDOREPLICATION; DISTRIBUTIONS; CONTAMINANTS; METHODOLOGY; PARAMETERS; CRITERION; SYSTEMS; MODELS; TIME AB Field experiments in ecological and environmental research usually do not meet the criteria for modern experimental design. Subsampling is often mistakenly substituted for true replication, and sample sizes are too small for adequate power in tests of significance. In many cases, field-study objectives may be better served by various kinds of sampling procedures, even though the resulting inferences will be weaker than those obtainable through controlled experimentation. The present paper provides a classification and description of methods for designing environmental studies, with emphasis on techniques as yet little used in ecology. Eight categories of techniques for field studies are defined in terms of the nature of control exerted by the observer, by the presence or absence of a perturbation, and by the domain of study. The first two categories include classical experimental approaches, replicated and unreplicated. Sampling for modelling provides efficient designs for estimating parameters in a specified model. Intervention analysis measures the effect of a known perturbation in a time series. Observational studies contrast selected groups from a population, while analytical sampling provides comparisons over the entire population. Descriptive survey sampling estimates means or totals over an entire population, while sampling for pattern deals with spatial patterns over a selected region. We propose that the statistical concept of a "superpopulation" may be useful in ecology, and that it may be desirable to approach community and ecosystem studies in a sampling framework, with experimentation used for a fairly narrow range of subsidiary investigations. Much more attention to processes for drawing inferences about cause and effect is needed, in any case. RP EBERHARDT, LL (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. RI Langhamer, Olivia/J-3425-2012 NR 90 TC 281 Z9 287 U1 8 U2 90 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE, NW, STE 400, WASHINGTON, DC 20036 SN 0012-9615 J9 ECOL MONOGR JI Ecol. Monogr. PD MAR PY 1991 VL 61 IS 1 BP 53 EP 73 DI 10.2307/1942999 PG 21 WC Ecology SC Environmental Sciences & Ecology GA EY777 UT WOS:A1991EY77700003 ER PT J AU MENDELSOHN, MH HARKNESS, JBL AF MENDELSOHN, MH HARKNESS, JBL TI ENHANCED FLUE-GAS DENITRIFICATION USING FERROUS.EDTA AND A POLYPHENOLIC COMPOUND IN AN AQUEOUS SCRUBBER SYSTEM SO ENERGY & FUELS LA English DT Article AB Previous work in this laboratory has involved studying the possibility of combined NO(x)/SO2 scrubbing using various aqueous chemistries with a metal chelate additive. Rcently, we have focused our work on the metal chelate ferrous.EDTA [Fe(II).EDTA]. A problem encountered in the practical application of Fe(II).EDTA is that the ferrous ion has been found to oxidize to the corresponding ferric species, leading to a decrease in NO(x) removal for the scrubbing solution containing the additive. We have found that addition of a polyphenolic compound leads to a sustained high NO(x) removal under various oxidizing conditions. We believe that the improved performance of Fe(II).EDTA is due to the known capabilities of these organic compounds both to inhibit oxidation of ferrous chelates by dissolved oxygen and to rapidly reduce any ferric ions back to the original ferrous species. These effects are illustrated by the following chemical reactions: O2(1) + organic --> oxidized organic, and Fe(III) + organic --> Fe(II) + oxidized organic. RP MENDELSOHN, MH (reprint author), ARGONNE NATL LAB,DIV ENERGY SYST,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 5 TC 14 Z9 20 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD MAR-APR PY 1991 VL 5 IS 2 BP 244 EP 248 DI 10.1021/ef00026a003 PG 5 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FC614 UT WOS:A1991FC61400003 ER PT J AU LITTLEJOHN, D CHANG, SG AF LITTLEJOHN, D CHANG, SG TI MODELING OF THE CHEMISTRY OF WET LIMESTONE FLUE-GAS DESULFURIZATION SYSTEMS SO ENERGY & FUELS LA English DT Article ID AQUEOUS-SOLUTION; KINETICS; CONSTANT; ACID; PH AB The chemistry of wet limestone flue gas desulfurization (FGD) systems is complicated by the interaction of dissolved SO2 and dissolved nitrogen oxides. A substantial number of nitrogen-sulfur compounds can be formed from the reactions of sulfite and bisulfite ions with nitrogen oxyanions. A computer model is used to simulate the kinetics and to determine the effect of scrubber operating conditions on the production of nitrogen-sulfur compounds. With increasingly stringent regulations covering solid and liquid waste disposal, it is important to minimize undesirable byproducts in FGD systems. The modeling is also used to study the effect of scrubber conditions on the production of N2O (nitrous oxide). Emission of N2O into the atmosphere is undesirable because it has both significant ozone depletion potential and global warming potential. C1 UNIV CALIF LAWRENCE BERKELEY LAB,DIV APPL SCI,1 CYCLOTRON RD,BERKELEY,CA 94720. NR 19 TC 21 Z9 21 U1 1 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD MAR-APR PY 1991 VL 5 IS 2 BP 249 EP 254 DI 10.1021/ef00026a004 PG 6 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FC614 UT WOS:A1991FC61400004 ER PT J AU HARRIOTT, P RUETHER, J SUDHOFF, F AF HARRIOTT, P RUETHER, J SUDHOFF, F TI PREDICTION OF SO2 REMOVAL FOR POWER-PLANTS USING DUCT INJECTION OF LIME SLURRY SO ENERGY & FUELS LA English DT Article AB In the duct injection process, lime slurry is sprayed into the flue gas to absorb SO2, and the dry solids formed are collected in a precipitator or baghouse. A model is used to predict SO2 removals for a population of coal-fired boilers that currently have no SO2 controls. For the majority of these units, the residence time available is greater than 0.5 s, and SO2 removals of 40-80% are predicted at a stoichiometric ratio of 1.8 if the maximum drop size is 70-mu-m. C1 US DOE,PITTSBURGH ENERGY TECHNOL CTR,PITTSBURGH,PA 15236. RP HARRIOTT, P (reprint author), CORNELL UNIV,ITHACA,NY 14853, USA. NR 6 TC 5 Z9 5 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD MAR-APR PY 1991 VL 5 IS 2 BP 254 EP 258 DI 10.1021/ef00026a005 PG 5 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FC614 UT WOS:A1991FC61400005 ER PT J AU OTTESEN, DK BAXTER, LL RADZIEMSKI, LJ BURROWS, JF AF OTTESEN, DK BAXTER, LL RADZIEMSKI, LJ BURROWS, JF TI LASER SPARK EMISSION-SPECTROSCOPY FOR INSITU, REAL-TIME MONITORING OF PULVERIZED COAL PARTICLE COMPOSITION SO ENERGY & FUELS LA English DT Article AB Laser spark emission spectroscopy is used to characterize individual coal particles in flowing environments. A high-energy, pulsed Nd:YAG laser is employed to rapidly heat particles forming an ionized plasma. After a delay of 1-mu-s, most of the atomic species are in the neutral or singly ionized state, and their characteristic line emission spectra are detected by using a spectrometer equipped with a time-gated diode-array detector. Nearly all of the inorganic constituents present in coal above a concentration of 100 ppm are observed in the laser spark emission from single particles. Several aspects of the technique are discussed: (1) the plasma excitation process; (2) experimental intensities and methods of calculating elemental composition; and (3) the comparison of particle-by-particle results with average bulk chemical analyses and scanning electron microscopy data. This work reports the first direct experimental comparison of composition on a particle-by-particle basis with grain-by-grain determinination of elemental ash composition. C1 NEW MEXICO STATE UNIV,DEPT PHYS,LAS CRUCES,NM 88001. RP OTTESEN, DK (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. RI Baxter, Larry/C-8567-2009 OI Baxter, Larry/0000-0002-0453-2659 NR 19 TC 43 Z9 44 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD MAR-APR PY 1991 VL 5 IS 2 BP 304 EP 312 DI 10.1021/ef00026a014 PG 9 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FC614 UT WOS:A1991FC61400014 ER PT J AU POLMAN, JK QUIGLEY, DR AF POLMAN, JK QUIGLEY, DR TI SIZE EXCLUSION CHROMATOGRAPHY OF ALKALI-SOLUBILIZED COAL SO ENERGY & FUELS LA English DT Letter C1 IDAHO NATL ENGN LAB,BIOTECHNOL UNIT,POB 1625,IDAHO FALLS,ID 83415. NR 10 TC 18 Z9 18 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD MAR-APR PY 1991 VL 5 IS 2 BP 352 EP 353 DI 10.1021/ef00026a022 PG 2 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FC614 UT WOS:A1991FC61400022 ER PT J AU SCHIPPER, L AF SCHIPPER, L TI IMPROVED ENERGY EFFICIENCY IN THE INDUSTRIALIZED COUNTRIES - PAST ACHIEVEMENTS, CO2 EMISSION PROSPECTS SO ENERGY POLICY LA English DT Article DE ENERGY EFFICIENCY; CO2 EMISSIONS; ENERGY-USE ID CONSERVATION AB This paper explores the contribution which energy efficiency might make to future reductions in CO2 emissions. Trends in key energy-use sectors and recent changes that may signal a slowdown in the rate of improvement of energy efficiency are examined. The OECD countries reduced their energy-use through greater efficiency by nearly 32 EJ, or 16 million bbl/day oil equivalent between 1972 and 1985. But the pace of these improvements in energy-use has begun to slow. Prospects for increased efficiency in each sector, and the barriers to achieving those increases, are discussed. RP SCHIPPER, L (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV APPL SCI,ENERGY ANAL PROGRAM,3125 BLDG 90,BERKELEY,CA 94720, USA. NR 33 TC 6 Z9 6 U1 0 U2 1 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0301-4215 J9 ENERG POLICY JI Energy Policy PD MAR PY 1991 VL 19 IS 2 BP 127 EP 137 DI 10.1016/0301-4215(91)90128-B PG 11 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA FB131 UT WOS:A1991FB13100006 ER PT J AU ROGERS, RD MCCONNELL, JW AF ROGERS, RD MCCONNELL, JW TI PERFORMANCE VERIFICATION OF SOLIDIFIED RADIOACTIVE-WASTE USING LYSIMETERS SO ENGINEERING GEOLOGY LA English DT Article AB Accurate data on the long-term performance of the radioactive wastes in disposal systems is becoming a necessity in part because of restrictive federal and state regulations which are being promulgated. A method which provides data on the performance of buried radioactive waste forms is comprised of lysimeters. They are ideal instruments for obtaining actual field test data because when properly designed and operated they can be used to isolate and then study soil/waste systems under actual environmental conditions. The complexity of interactions under such conditions can never be completely duplicated by standard laboratory testing. This paper provides data from two instrumented, operational lysimeter arrays containing waste forms fabricated with highly loaded exchange resin materials. The lysimeters have been in operation for three years and provide both meteorological data and radionuclide content of percolating water. This paper provides data obtained from the lysimeters and discusses how these data can be used as a database for input into codes used to verify performance of buried radioactive waste forms. RP ROGERS, RD (reprint author), IDAHO NATL ENGN LAB,BIOTECHNOL UNIT,POB 1625,IDAHO FALLS,ID 83415, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0013-7952 J9 ENG GEOL JI Eng. Geol. PD MAR PY 1991 VL 30 IS 1 BP 79 EP 101 DI 10.1016/0013-7952(91)90036-K PG 23 WC Engineering, Geological; Geosciences, Multidisciplinary SC Engineering; Geology GA FC596 UT WOS:A1991FC59600005 ER PT J AU HIRST, E AF HIRST, E TI BOOSTING UNITED-STATES ENERGY EFFICIENCY THROUGH FEDERAL-ACTION SO ENVIRONMENT LA English DT Article RP HIRST, E (reprint author), OAK RIDGE NATL LAB,DIV ENERGY,OAK RIDGE,TN 37830, USA. NR 30 TC 1 Z9 1 U1 0 U2 0 PU HELDREF PUBLICATIONS PI WASHINGTON PA 1319 EIGHTEENTH ST NW, WASHINGTON, DC 20036-1802 SN 0013-9157 J9 ENVIRONMENT JI Environment PD MAR PY 1991 VL 33 IS 2 BP 7 EP & PG 0 WC Environmental Sciences; Environmental Studies SC Environmental Sciences & Ecology GA FJ746 UT WOS:A1991FJ74600006 ER PT J AU COWAN, CE ZACHARA, JM RESCH, CT AF COWAN, CE ZACHARA, JM RESCH, CT TI CADMIUM ADSORPTION ON IRON-OXIDES IN THE PRESENCE OF ALKALINE-EARTH ELEMENTS SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID HYDROUS MANGANESE OXIDE; METAL-IONS; SOLUTION INTERFACE; CATION ADSORPTION; FERRIC-OXIDE; ALPHA-FEOOH; SORPTION; MODEL; OXYHYDROXIDE; SYSTEMS AB Cadmium sorption on Fe2O3.H2O(am) in the presence of alkaline-earth cations was investigated with emphasis on the Cd-Ca binary system. In binary-element sorption experiments with Ca, Mg, Sr, and Ba, competition was observed primarily in Cd-Ca binary mixtures, which were studied at three ionic strengths (0.5, 0.1, and 0.005 M). The extent of competition increased with increasing Ca concentration. In single-element experiments changes in ionic strength (between 0.005 and 0.5 M) did not influence Cd sorption but did affect Ca sorption, implying that a portion of the Ca surface complexes were outer sphere. The triple-layer model (TLM), using inner- and outer-sphere complexation reactions, and the nonelectrostatic model (NEM), incorporating only one adsorption plane, both adequately represented the adsorption of the individual elements and predicted the Cd-Ca competition at ionic strengths of 0.5 and 0.1 M. Neither model predicted the competition at 0.005 M. The NEM better simulated the shape of the measured Cd-Ca adsorption edge at all ionic strengths. The combined experimental and modeling results suggest that Cd-Ca competitive adsorption on Fe2O3.H2O(am) occurs via mass action on mutually accessible surface sites. RP COWAN, CE (reprint author), PACIFIC NW LAB, DEPT ENVIRONM SCI, MSIN K3-61,POB 999, RICHLAND, WA 99352 USA. NR 50 TC 137 Z9 139 U1 4 U2 21 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 MAR PY 1991 VL 25 IS 3 BP 437 EP 446 DI 10.1021/es00015a009 PG 10 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA EZ643 UT WOS:A1991EZ64300014 ER PT J AU NORTON, GA RICHARDSON, RG MARKUSZEWSKI, R LEVINE, AD AF NORTON, GA RICHARDSON, RG MARKUSZEWSKI, R LEVINE, AD TI PRECIPITATION OF JAROSITE COMPOUNDS AS A METHOD FOR REMOVING IMPURITIES FROM ACIDIC WASTES FROM CHEMICAL COAL CLEANING SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article AB Precipitation of jarosite compounds to remove Na, Fe, and SO4(2-) from spent acid solutions from a chemical coal-cleaning process was studied in relation to reaction time and pH. Although Fe and SO4(2-) could be removed effectively from model solutions at pH values of 1.5-2.3, optimum Na removal was possible only within the narrow pH range of 1.4-1.6. Maximum precipitate yields were obtained within approximately 6 h at both 80 and 95-degrees-C, with at least 80% of the Fe and SO4(2-) and approximately 60-75% of the Na removed. An additional benefit of precipitation of jarosite compounds to remove impurities from spent acid streams is that these compounds have low solubilities in water and are therefore attractive from a waste disposal perspective. Based on this study, the feasibility of cleaning spent acid from a chemical coal-cleaning process by precipitating jarosite compounds has been demonstrated. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CIVIL & CONSTRUCT ENGN,AMES,IA 50011. RP NORTON, GA (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 21 TC 15 Z9 15 U1 0 U2 5 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 MAR PY 1991 VL 25 IS 3 BP 449 EP 455 DI 10.1021/es00015a011 PG 7 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA EZ643 UT WOS:A1991EZ64300016 ER PT J AU SMITH, RW JENNE, EA AF SMITH, RW JENNE, EA TI RECALCULATION, EVALUATION, AND PREDICTION OF SURFACE COMPLEXATION CONSTANTS FOR METAL ADSORPTION ON IRON AND MANGANESE OXIDES SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID ELECTRICAL DOUBLE-LAYER; SITE-BINDING MODEL; ION SEA-WATER; HETEROGENEOUS SURFACES; ELECTROSTATIC MODELS; SOLUTION INTERFACE; ALPHA-FEOOH; OXYHYDROXIDE; IONIZATION; GOETHITE AB The triple-layer model of the oxide/water interface can be used to calculate the partitioning of metals among solid and aqueous phases. The defensible use of the triple-layer model in groundwater/sediment systems requires an adequate and consistent set of intrinsic adsorption constants. In the present study, published values of p*K(int) for cation adsorption on iron and manganese oxides have been used to calculate values for surface complexation constants (log K(SC) via [GRAPHICS] where pK(a2)int is the intrinsic acidity constant and beta-1n is the nth cation hydrolysis constant. This transformation reduced the variation between log K(SC) values determined by different investigators. Uncertainties in acidity constants and variations in site loading with adsorbing metal are the major sources of variation in the values of p*K(int). In addition, ionic strength can affect the values of p*K(int) for strongly adsorbed cations. Predictive equations based on ion size and hydrolysis behavior have been derived and missing values of p*K(int) for important pollutant metals predicted. Although these equations do not explicitly account for variations in ionic strength and surface loading, they are useful for predicting values of p*K(int) with uncertainties of 0.5-0.8 (alpha-FeOOH) and 0.4-1.5 log units (delta-MnO2). Recently published K(SC) values validate the predictive equation developed for the first and second hydrolysis products of thorium. A data base of p*K(int) values is presented in which the variability in pK(a2)int values are removed and missing values estimated. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 46 TC 56 Z9 56 U1 3 U2 13 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 MAR PY 1991 VL 25 IS 3 BP 525 EP 531 DI 10.1021/es00015a022 PG 7 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA EZ643 UT WOS:A1991EZ64300027 ER PT J AU COLEMAN, RM FISCHER, RU AF COLEMAN, RM FISCHER, RU TI BROOD SIZE, MALE FANNING EFFORT AND THE ENERGETICS OF A NONSHAREABLE PARENTAL INVESTMENT IN BLUEGILL SUNFISH, LEPOMIS-MACROCHIRUS (TELEOSTEI, CENTRARCHIDAE) SO ETHOLOGY LA English DT Article ID GASTEROSTEUS-ACULEATUS; DECISION RULES; STORAGE; STICKLEBACK; INCUBATION; PATTERNS; BEHAVIOR; COSTS; CARE AB We present a model and an experimental test for a nonshareable parental-investment behavior (fanning of eggs) using parental male bluegill sunfish. The model predicts that as brood size increases, nonshareable investment into the brood should increase if a parent is to maximize its remaining lifetime reproductive success. The experimental test manipulated the number of eggs in nests and quantified the frequency and tempo of fanning in the field using underwater video equipment. As predicted, male bluegill fanned larger broods more frequently than smaller broods. The fanning tempo (beats per min) did not change with changes in brood size. Parental males lost substantial amounts of body weight during the period of parental care, and lipid extractions revealed a loss in nonpolar lipids. The difference in fanning frequency between large and small broods did not result in differential weight loss for the parents, but parents that fanned more tended to lose more nonpolar lipids from the body tissue than males that fanned less. C1 SAVANNAH RIVER ECOL LAB,AIKEN,SC 29801. RP COLEMAN, RM (reprint author), UNIV TORONTO,DEPT ZOOL,TORONTO M5S 1A1,ONTARIO,CANADA. NR 33 TC 77 Z9 78 U1 1 U2 11 PU BLACKWELL WISSENSCHAFTS-VERLAG GMBH PI BERLIN PA KURFURSTENDAMM 57, D-10707 BERLIN, GERMANY SN 0179-1613 J9 ETHOLOGY JI Ethology PD MAR-APR PY 1991 VL 87 IS 3-4 BP 177 EP 188 PG 12 WC Psychology, Biological; Behavioral Sciences; Zoology SC Psychology; Behavioral Sciences; Zoology GA FL843 UT WOS:A1991FL84300001 ER PT J AU BEDELL, KS VANDEHAAR, PG AF BEDELL, KS VANDEHAAR, PG TI THE MAGNETIC GRUNEISEN-PARAMETER FOR DILUTE MIXTURES OF HE-3 IN SUPERFLUID HE-4 SO EUROPHYSICS LETTERS LA English DT Article ID HE-3-HE-4 AB We show that the magnetic Gruneisen parameter, G(M) = 1 - partial log-chi/partial log n, provides new insight into the effective interactions between the He-3 quasi-particles in dilute He-3- He-4 mixtures. From currently available data we also show that 1 - G(M) has a minimum at a very low concentration approximately (0.1 divided-by 0.17)% and that this has a weak pressure dependence. The implications for microscopic models are discussed. C1 LEIDEN STATE UNIV,KAMERLINGH ONNES LAB,2311 SB LEIDEN,NETHERLANDS. RP BEDELL, KS (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,T11,MS-B262,LOS ALAMOS,NM 87545, USA. NR 13 TC 1 Z9 1 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD MAR 1 PY 1991 VL 14 IS 5 BP 469 EP 474 DI 10.1209/0295-5075/14/5/014 PG 6 WC Physics, Multidisciplinary SC Physics GA FA318 UT WOS:A1991FA31800014 ER PT J AU PIH, H LIU, KC AF PIH, H LIU, KC TI LASER DIFFRACTION METHODS FOR HIGH-TEMPERATURE STRAIN-MEASUREMENTS SO EXPERIMENTAL MECHANICS LA English DT Article AB Optical methods, utilizing the interference fringes produced by diffraction of a laser light beam passing through a narrow slit, have been investigated for strain measurements at high temperatures above 1000-degrees-C. Two methods are reviewed, one suitable for dynamic loading conditions and the other for slow rate and static loading conditions. The basic principles of the methods, new instrumentation, and new measurement techniques are described. Experimental verification of the basic optical theory, system calibration, results of cross calibrations with foil strain gage, and sample applications at high temperatures are presented. Test results show that both methods are capable of performing accurate and reliable strain measurements at high temperatures. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP PIH, H (reprint author), UNIV TENNESSEE,ENGN SCI & MECH,KNOXVILLE,TN 37996, USA. NR 5 TC 3 Z9 3 U1 0 U2 2 PU SOC EXPERIMENTAL MECHANICS PI BETHEL PA 7 SCHOOL STREET, BETHEL, CT 06801 SN 0014-4851 J9 EXP MECH JI Exp. Mech. PD MAR PY 1991 VL 31 IS 1 BP 60 EP 64 DI 10.1007/BF02325725 PG 5 WC Materials Science, Multidisciplinary; Mechanics; Materials Science, Characterization & Testing SC Materials Science; Mechanics GA FH620 UT WOS:A1991FH62000011 ER PT J AU NAGARAJAN, NR CULLICK, AS GRIEWANK, A AF NAGARAJAN, NR CULLICK, AS GRIEWANK, A TI NEW STRATEGY FOR PHASE-EQUILIBRIUM AND CRITICAL-POINT CALCULATIONS BY THERMODYNAMIC ENERGY ANALYSIS .1. STABILITY ANALYSIS AND FLASH SO FLUID PHASE EQUILIBRIA LA English DT Article ID SINGULARITIES AB We have reformulated Michelsen's method of phase stability analysis, which employs the thermodynamic energy minimization in terms of the tangent plane criterion. In our method, we use the component molar densities as the primary variables in place of the mole numbers or mole fractions. Furthermore, we use a modified stability test procedure called the 'semi-local' stability test and a higher order initialization procedure in the two-phase region. We believe that these modifications improve the numerical stability and the speed of convergence of the iterative technique, particularly in the near-critical and the liquid-liquid regions. We demonstrate the successful use of this method with well-defined example fluid systems and near-critical and retrograde condensate petroleum reservoir fluids. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP NAGARAJAN, NR (reprint author), MOBIL RES & DEV CORP,DALLAS,TX 75381, USA. OI Griewank, Andreas/0000-0001-9839-1473 NR 17 TC 50 Z9 50 U1 0 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3812 J9 FLUID PHASE EQUILIBR JI Fluid Phase Equilib. PD MAR PY 1991 VL 62 IS 3 BP 191 EP 210 DI 10.1016/0378-3812(91)80010-S PG 20 WC Thermodynamics; Chemistry, Physical; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA FD465 UT WOS:A1991FD46500002 ER PT J AU NAGARAJAN, NR CULLICK, AS GRIEWANK, A AF NAGARAJAN, NR CULLICK, AS GRIEWANK, A TI NEW STRATEGY FOR PHASE-EQUILIBRIUM AND CRITICAL-POINT CALCULATIONS BY THERMODYNAMIC ENERGY ANALYSIS .2. CRITICAL-POINT CALCULATIONS SO FLUID PHASE EQUILIBRIA LA English DT Article ID MIXTURES AB The thermodynamic energy analysis of Michelsen is reformulated in terms of component molar densities as the primary variables. In this formulation, we can provide analytical expressions for any higher order derivatives for the energy function. This feature enables us to enhance the speed and the reliability of the critical point search method. It is designed to find the critical composition and the critical pressure for fluid mixtures at a fixed temperature (pressure-composition diagram), as well as critical points in the composition space at the specified pressure and temperature (pseudo-ternary diagrams). This has proved to be very useful in finding the miscibility composition for complex and near-critical petroleum reservoir fluids subjected to gas injection. A number of examples illustrate the successful use of this method. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP NAGARAJAN, NR (reprint author), MOBIL RES & DEV CORP,DALLAS,TX 75381, USA. NR 18 TC 28 Z9 28 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3812 J9 FLUID PHASE EQUILIBR JI Fluid Phase Equilib. PD MAR PY 1991 VL 62 IS 3 BP 211 EP 223 DI 10.1016/0378-3812(91)80011-J PG 13 WC Thermodynamics; Chemistry, Physical; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA FD465 UT WOS:A1991FD46500003 ER PT J AU ADAMS, MB ONEILL, EG AF ADAMS, MB ONEILL, EG TI EFFECTS OF OZONE AND ACIDIC DEPOSITION ON CARBON ALLOCATION AND MYCORRHIZAL COLONIZATION OF PINUS-TAEDA L SEEDLINGS SO FOREST SCIENCE LA English DT Article DE STARCH; RHIZOSPHERE; AIR POLLUTION ID NET PHOTOSYNTHESIS; SULFUR-DIOXIDE; GROWTH; RAIN AB Patterns of carbon allocation and mycorrhizal colonization were examined in loblolly pine seedlings from two half-sib families exposed to three ozone treatments (charcoal-filtered air, ambient air + 80 ppb O3, and ambient air + 160 ppb O3) and three rain pH levels (5.2, 4.5, and 3.3) for 12 weeks in open-topped chambers in a field setting. No statistically significant effects of ozone or rain pH were detected on biomass, root:shoot ratios, or carbon allocation; some consistent patterns were observed, however. Coarse root starch concentrations and mycorrhizal infection varied significantly with ozone levels. No significant interactions of ozone, rain pH, or genotype were detected. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN. RP ADAMS, MB (reprint author), US FOREST SERV,TIMBER & WATERSHED LAB,PARSONS,WV 26287, USA. NR 21 TC 21 Z9 21 U1 1 U2 5 PU SOC AMER FORESTERS PI BETHESDA PA 5400 GROSVENOR LANE, BETHESDA, MD 20814 SN 0015-749X J9 FOREST SCI JI For. Sci. PD MAR PY 1991 VL 37 IS 1 BP 5 EP 16 PG 12 WC Forestry SC Forestry GA FD757 UT WOS:A1991FD75700001 ER PT J AU STEPHENS, HP KOTTENSTETTE, RJ AF STEPHENS, HP KOTTENSTETTE, RJ TI STUDIES OF COAL REACTIVITY FOR DIRECT LIQUEFACTION SO FUEL LA English DT Article; Proceedings Paper CT CONF ON COAL STRUCTURE AND REACTIVITY CY SEP 05-07, 1990 CL CAMBRIDGE, ENGLAND DE COAL; LIQUEFACTION; REACTIVITY ID MACROMOLECULAR NETWORK; DEBATE AB Laboratory coal liquefaction experiments were used to investigate the relationship of product distributions to the reaction variables of temperature, time, catalyst, solvent, and hydrogen availability. For reaction conditions that ensured an adequate availability of hydrogen, conversion of a bituminous coal to products (grouped into three molecular weight distributions) can be quantitatively represented by a series reaction path described by a single selectivity constant. In addition, the stoichiometry of hydrogen consumption indicated a high hydrogen uptake during the initial coal dissolution step. These results are explained in terms of a macromolecular network structure of coal. RP STEPHENS, HP (reprint author), SANDIA NATL LABS,DIV PROC RES,ALBUQUERQUE,NM 87185, USA. NR 30 TC 1 Z9 1 U1 0 U2 1 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0016-2361 J9 FUEL JI Fuel PD MAR PY 1991 VL 70 IS 3 BP 386 EP 392 DI 10.1016/0016-2361(91)90127-V PG 7 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FE365 UT WOS:A1991FE36500016 ER PT J AU SNAPE, CE LAFFERTY, CJ STEPHENS, HP DOSCH, RG KLAVETTER, E AF SNAPE, CE LAFFERTY, CJ STEPHENS, HP DOSCH, RG KLAVETTER, E TI EFFECT OF CATALYST PRECURSORS ON COAL REACTIVITY IN CATALYTIC HYDROPYROLYSIS SO FUEL LA English DT Article DE CATALYST; REACTIVITY; HYDROPYROLYSIS ID LIQUEFACTION; SOLVENT AB The use of dispersed sulphided molybdenum and hydrous titanium oxide (HTO) catalysts enable tar yields in excess of 60% daf coal to be obtained for bituminous coals in fixed-bed hydropyrolysis using relatively mild conditions. However, it was found that a key difference between hydropyrolysis and batchwise hydrogenation is that the active form of the catalyst must be formed at a lower temperature in hydropyrolysis in order to be effective because of the much higher heating rates used. Thus, ammonium dioxydithiomolybdate which decomposes to form a sulphided Mo compound below 250-degrees-C and Pd-exchanged HTO, where the Pd is reduced below 100-degrees-C, have been found to be particularly effective (approximately 0.2%. Mo required to achieve maximum conversion). Molybdenum naphthenates and iron sulphides are much less effective in hydropyrolysis than in direct liquefaction because the active phases (MoS2 and pyrrhotite) are not appreciably formed below about 400-degrees-C. Preliminary results indicate that low concentrations of Mo (about 0.02%) have considerable activity when ion-exchanged onto HTO-coated coals. C1 SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. RP SNAPE, CE (reprint author), UNIV STRATHCLYDE, DEPT PURE & APPL CHEM, GLASGOW G1 1XL, SCOTLAND. OI Snape, Colin/0000-0002-6671-8766 NR 20 TC 10 Z9 11 U1 1 U2 3 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0016-2361 J9 FUEL JI Fuel PD MAR PY 1991 VL 70 IS 3 BP 393 EP 395 DI 10.1016/0016-2361(91)90128-W PG 3 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FE365 UT WOS:A1991FE36500017 ER PT J AU PUGMIRE, RJ SOLUM, MS GRANT, DM CRITCHFIELD, S FLETCHER, TH AF PUGMIRE, RJ SOLUM, MS GRANT, DM CRITCHFIELD, S FLETCHER, TH TI STRUCTURAL EVOLUTION OF MATCHED TAR-CHAR PAIRS IN RAPID PYROLYSIS EXPERIMENTS SO FUEL LA English DT Article; Proceedings Paper CT CONF ON COAL STRUCTURE AND REACTIVITY CY SEP 05-07, 1990 CL CAMBRIDGE, ENGLAND DE TAR; CHAR; PYROLYSIS ID COAL PYROLYSIS; CROSS-POLARIZATION; BITUMINOUS COAL; DEVOLATILIZATION; MODEL; NMR; TEMPERATURE; KINETICS; EXTRACTABLES; PARTICLES AB Solid-state C-13 and H-1 nuclear magnetic resonance (n.m.r.) spectroscopy techniques were used to investigate the relationship between the chemical structure of coal and the char particles and condensed tar vapours produced from coals of various ranks at rapid heating conditions. The C-13 n.m.r. analysis of the coal chars indicated that significant amounts of aliphatic material were released from the coal during devolatilization with little initial change to the aromatic cluster size or number of cross-links per cluster. The evolution of the char structure following tar release was a function of the temperature history of the char. The structure of the primary tars were compared to the parent coal, and the gas phase evolution of the tar structure was followed with time. C1 UNIV UTAH,DEPT CHEM,SALT LAKE CITY,UT 84112. BRIGHAM YOUNG UNIV,DEPT CHEM,PROVO,UT 84602. SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94550. RP PUGMIRE, RJ (reprint author), UNIV UTAH,DEPT FUELS ENGN,SALT LAKE CITY,UT 84112, USA. NR 45 TC 46 Z9 46 U1 1 U2 13 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0016-2361 J9 FUEL JI Fuel PD MAR PY 1991 VL 70 IS 3 BP 414 EP 423 DI 10.1016/0016-2361(91)90132-T PG 10 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FE365 UT WOS:A1991FE36500021 ER PT J AU NAKAMURA, Y WAKATANI, M LEBOEUF, JN CARRERAS, BA DOMINGUEZ, N HOLMES, JA LYNCH, VE PAINTER, SL GARCIA, L AF NAKAMURA, Y WAKATANI, M LEBOEUF, JN CARRERAS, BA DOMINGUEZ, N HOLMES, JA LYNCH, VE PAINTER, SL GARCIA, L TI EQUILIBRIUM, STABILITY, AND DEEPLY TRAPPED ENERGETIC PARTICLE CONFINEMENT CALCULATIONS FOR 1 = 2 TORSATRON HELIOTRON CONFIGURATIONS SO FUSION TECHNOLOGY LA English DT Article DE MHD EQUILIBRIUM; MHD STABILITY; TORSATRON ID STELLARATORS AB Confinement properties of l = 2 torsatron/heliotron configurations with number of toroidal field periods, M, in the range of 10 to 14 are studied. This involves the calculation of zero-current and flux-conserving equilibria; stability against Mercier modes and low-n ideal modes, with n denoting the toroidal mode number; and orbit confinement of deeply trapped energetic particles. Optimization of both magnetohydrodynamic (MHD) and transport properties is pursued under the condition of plasma aspect ratio A = R/a greater-than-or-equal-to 7, with R denoting the major radius and a the average plasma radius. For configurations with M less-than-or-equal-to 12, an average MHD beta limit of 4 to 5% is possible. The addition of a quadrupole field improves the confinement of trapped particles at zero pressure, but particle losses increase with increasing beta. This loss is less severe if the vacuum magnetic axis is shifted slightly inward. A configuration with M = 10, a coil pitch parameter p(c) in the range 1.25 to 1.30, and an added quadrupole field satisfies the beta and energetic particle confinement requirements for the next generation of large torsatron/heliotron devices. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV COMPLUTENSE MADRID,EURATOM,CIEMAT,E-28040 MADRID,SPAIN. RP NAKAMURA, Y (reprint author), KYOTO UNIV,PLASMA PHYS LAB,UJI,KYOTO 611,JAPAN. RI Lynch, Vickie/J-4647-2012; Garcia, Luis/A-5344-2015; Painter, Scott/C-2586-2016 OI Lynch, Vickie/0000-0002-5836-7636; Garcia, Luis/0000-0002-0492-7466; Painter, Scott/0000-0002-0901-6987 NR 27 TC 12 Z9 12 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1991 VL 19 IS 2 BP 217 EP 233 PG 17 WC Nuclear Science & Technology SC Nuclear Science & Technology GA EY915 UT WOS:A1991EY91500002 ER PT J AU DEVOTO, RS BARR, WL BULMER, RH CAMPBELL, RB FENSTERMACHER, ME LEE, JD LOGAN, BG MILLER, JR REGINATO, LL KRAKOWSKI, RA MILLER, RL ANDERSON, OA COOPER, WS SCHULTZ, JH YUGO, JJ FINK, JH GOHAR, Y AF DEVOTO, RS BARR, WL BULMER, RH CAMPBELL, RB FENSTERMACHER, ME LEE, JD LOGAN, BG MILLER, JR REGINATO, LL KRAKOWSKI, RA MILLER, RL ANDERSON, OA COOPER, WS SCHULTZ, JH YUGO, JJ FINK, JH GOHAR, Y TI PROJECTIONS FOR A STEADY-STATE TOKAMAK REACTOR BASED ON THE INTERNATIONAL THERMONUCLEAR EXPERIMENTAL REACTOR SO FUSION TECHNOLOGY LA English DT Article DE STEADY-STATE REACTOR; ITER; NONINDUCTIVE CURRENT DRIVE ID CONFINEMENT; PLASMA AB The extensions of the physics and engineering guidelines for the International Thermonuclear Experimental Reactor (ITER) device needed for acceptable operating points for a steady-state tokamak power reactor are examined. Noninductive current drive is provided in steady state by high-energy neutral beam injection in the plasma core, lower hybrid slow waves in the outer regions of the plasma, and bootstrap current. Three different levels of extension of the ITER physics/engineering guidelines, with differing assumptions on the possible plasma beta, elongation, and aspect ratio, are considered for power reactor applications. Plasma gain Q = fusion power/input power in excess of 20 and average neutron wall fluxes from 2.3 to 3.6 MW/m2 are predicted in devices with major radii varying from 7.0 to 6.0 m and aspect ratios from 2.9 to 4.3. Only modest enhancements over L-mode (Goldston) energy confinement are required. Peak divertor heat fluxes range up to 12.4 MW/m2, which is somewhat higher than the current ITER design limit of 10 MW/m2 with a magnetically swept divertor. These designs were selected on the basis of improvements in physics/engineering consistent with time scales for development of future reactors. The design reoptimization on the basis of cost of electricity (COE) was then examined using a reactor systems model. This analysis generally verified the original estimates for the required extensions of the ITER guidelines. The COE is projected to be < 66 mill/kW(electric).h in all of the configurations. The smallest reactor, which has the largest neutron wall flux and mass power density, yields the lowest COE, 56 mill/kW(electric).h. While these costs are marginally competitive with fission power, these modest extensions of the ITER guidelines do produce a viable power reactor. With time for further improvements such as those pursued in the ARIES study, similar designs could present an even more competitive commercial product. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139. OAK RIDGE NATL LAB,CTR FUS ENGN,OAK RIDGE,TN 37831. NEGION INC,HAYWARD,CA 94542. ARGONNE NATL LAB,ARGONNE,IL 60439. RP DEVOTO, RS (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 42 TC 3 Z9 3 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD MAR PY 1991 VL 19 IS 2 BP 251 EP 272 PG 22 WC Nuclear Science & Technology SC Nuclear Science & Technology GA EY915 UT WOS:A1991EY91500004 ER PT J AU SHUTLER, G MACKENZIE, AE BRUNNER, H WIERINGA, B DEJONG, P LOHMAN, FP LEBLOND, S BAILLY, J KORNELUK, RG AF SHUTLER, G MACKENZIE, AE BRUNNER, H WIERINGA, B DEJONG, P LOHMAN, FP LEBLOND, S BAILLY, J KORNELUK, RG TI PHYSICAL AND GENETIC-MAPPING OF A NOVEL CHROMOSOME-19 ERCC1 MARKER SHOWING CLOSE LINKAGE WITH MYOTONIC-DYSTROPHY SO GENOMICS LA English DT Article ID DNA-REPAIR GENE; DISEQUILIBRIUM; CLONING; LOCUS C1 UNIV OTTAWA,DEPT MICROBIOL & IMMUNOL,OTTAWA K1N 6N5,ONTARIO,CANADA. CATHOLIC UNIV NIJMEGEN,DEPT HUMAN GENET,NIJMEGEN,NETHERLANDS. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. RP SHUTLER, G (reprint author), CHILDRENS HOSP EASTERN ONTARIO,DIV GENET,OTTAWA K1H 8L1,ONTARIO,CANADA. RI Wieringa, Berend/A-5346-2011; Brunner, Han/C-9928-2013 OI Wieringa, Berend/0000-0001-9192-8020; NR 20 TC 9 Z9 9 U1 0 U2 4 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD MAR PY 1991 VL 9 IS 3 BP 500 EP 504 DI 10.1016/0888-7543(91)90416-C PG 5 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA EY816 UT WOS:A1991EY81600011 PM 1674498 ER PT J AU PECK, JA TAIT, CD SWANSON, BI BROWN, GE AF PECK, JA TAIT, CD SWANSON, BI BROWN, GE TI SPECIATION OF AQUEOUS GOLD(III) CHLORIDES FROM ULTRAVIOLET VISIBLE ABSORPTION AND RAMAN RESONANCE RAMAN SPECTROSCOPIES SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID INORGANIC-CHEMISTRY; LOW-TEMPERATURES; GOLD DEPOSITION; COMPLEXES; SOLUBILITY; TRANSPORT; XPS AB Gold(III) speciation in a one molar NaCl aqueous solution at ambient temperature and pressure was determined as a function of pH using ultraviolet/visible (UV/vis) absorption and Raman/resonance Raman (RR) spectroscopies. Gold concentrations in the solutions studied by UV/vis spectroscopy were approximately 10(-4) M whereas those studied by Raman spectroscopy were approximately 10(-2) M. Changes in the intensity and positions of ligand-to-metal charge transfer bands in the UV/vis spectra of the Au(III) chloride solutions with increasing pH are consistent with replacement of chloride by hydroxide ligands. Changes in the number, position, and intensity of Raman and RR spectra of the same solutions are also consistent with successive replacement of chloride by hydroxide ligands in the first coordination sphere of four-coordinated Au(III) with increasing pH. Our Raman and UV/vis data are broadly consistent with earlier speciation predictions based on a variety of chemical measurements, but demonstrate that the mixed chloro-hydroxo complexes are more stable than predicted on the basis of theoretically estimated stability constants. C1 UNIV CALIF LOS ALAMOS SCI LAB,INORGAN & STRUCT CHEM GRP INC4,LOS ALAMOS,NM 87545. RP PECK, JA (reprint author), STANFORD UNIV,SCH EARTH SCI,AQUEOUS & SURFACE GEOCHEM GRP,STANFORD,CA 94305, USA. NR 41 TC 105 Z9 107 U1 4 U2 41 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 MAR PY 1991 VL 55 IS 3 BP 671 EP 676 DI 10.1016/0016-7037(91)90332-Y PG 6 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA FD752 UT WOS:A1991FD75200003 ER PT J AU SMITH, BM AF SMITH, BM TI GEOLOGIC IMPLICATIONS OF THE OXYGEN ISOTOPE PROFILE OF THE TOA-BAJA DRILL HOLE, PUERTO-RICO SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article AB The whole-rock O-isotopic compositions of volcanic and volcaniclastic samples from the Toa Baja drill hole demonstrate that low-temperature (< 200-degrees-C) processes have strongly enriched the island arc materials in O-18. Subsequent to eruption, processes such as subaerial weathering, alteration during transport and deposition in volcaniclastic aprons, submarine weathering, burial diagenesis, and prograde regional metamorphism through the beginning of the prehnite-pumpellyite facies have raised average whole-rock delta-O-18 values by approximately 4 parts-per-thousand for basalt and andesite lava flows, and by approximately 8 parts-per-thousand for volcaniclastic sandstones. These O-isotopic disturbances were probably caused by oxygen exchange with regionally circulating seawater uner rather high water/rock conditions. The processes associated with "ageing" of volcanic and volcaniclastic materials in the oceanic environment are probably more important to the global budgets of the oxygen isotopes than has been assumed in the past. Integration of these results into global models for the oxygen isotopes awaits analysis of more varied oceanic terranes, to determine the generality of the O-isotopic conclusions proferred here, and to more carefully evaluate the relative sizes of volcanic, volcaniclastic, and oceanic oxygen reservoirs and their variabilities in time. RP SMITH, BM (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV EARTH SCI,CTR ISOTOPE GEOCHEM,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD MAR PY 1991 VL 18 IS 3 BP 549 EP 552 DI 10.1029/91GL00390 PG 4 WC Geosciences, Multidisciplinary SC Geology GA FC748 UT WOS:A1991FC74800051 ER PT J AU BIEHLER, S FERGUSON, J BALDRIDGE, WS JIRACEK, GR ALDERN, JL MARTINEZ, M FERNANDEZ, R ROMO, J GILPIN, B BRAILE, LW HERSEY, DR LUYENDYK, BP AIKEN, CL AF BIEHLER, S FERGUSON, J BALDRIDGE, WS JIRACEK, GR ALDERN, JL MARTINEZ, M FERNANDEZ, R ROMO, J GILPIN, B BRAILE, LW HERSEY, DR LUYENDYK, BP AIKEN, CL TI A GEOPHYSICAL MODEL OF THE ESPANOLA BASIN, RIO-GRANDE RIFT, NEW-MEXICO SO GEOPHYSICS LA English DT Article ID MOUNTAINS VOLCANIC FIELD; JEMEZ MOUNTAINS; SEISMIC REFRACTION; CONTINENTAL RIFTS; CRUSTAL STRUCTURE; EAST-AFRICA; EVOLUTION; MIOCENE AB A model of the subsurface structure of the eastern part of the Espanola Basin in the northern Rio Grande rift of New Mexico was constructed from geophysical data obtained since 1983 by the Summer of Applied Geophysical Experience (SAGE) field course. Approximately 742 new gravity observations, 1276 ground magnetic stations, 30 km of seismic refraction lines, 19 km of seismic reflection lines, 22 magnetotelluric stations, and several Schlumberger and dipole-dipole resistivity lines were established. Our studies provide new information on one boundary of a major continental rift and on the depositional and structural style of an extensional basin within the rift. Integration of these data sets into a single transect indicates that the Espanola Basin is asymmetrical with approximately 2 to 3 km of sediments and sedimentary rocks near the center, thinning eastward to the Precambrian outcrop of the flanking Sangre de Cristo uplift. Several minor faults with throws of less than 200 m were found, but no major eastern bounding fault was observed. Thus, the Espanola Basin could be an asymmetrical, west-dipping half-graben. However, major fault offset, down toward the basin axis, may occur within Precambrian rocks of the Sangre de Cristo uplift. In either case, the geometry of the basin does not agree well with current models for the structural evolution of continental rifts, which emphasize low-angle detachment faults which create asymmetrical, hinged half-grabens. These models predict that major shoulder uplift should occur adjacent to the side of the graben bounded by a listric master fault rather than adjacent to the hinged side. In contrast, for the Espanola Basin major uplift occurred adjacent to the eastern side, which could be the hinged side of the basin. A thick wedge of older sedimentary rocks with high P-wave velocity (4.4 km/s) and low electrical resistivity (5-OMEGA.m) was discovered under the younger Tertiary sediments and sedimentary rocks near the center of the basin. This wedge has maximum thickness of 1.2 km at the western end of the profile and thins eastward. The physical properties suggest this layer could be older Tertiary, or possibly a Mesozoic-Paleozoic, section of rocks. If the latter, it has potential economic importance because of the possible presence of a Creaceous section which is known to produce oil and gas in the Albuquerque Basin to the south and the San Luis Basin to the north. However, based on data from the Yates La Mesa no. 2 well, 10 km south of the transect, this wedge is likely middle Tertiary lacustrine deposits (NMOCD, 1986). The great thickness of lake deposits may represent a major lacustrine facies of the Eocene Galisteo and El Rito formations, exposed around the southern, southwestern, and northwestern margins of the basin. Magnetotelluric data suggest the crystalline basement underlying the central Espanola Basin may be more conductive than near the eastern margin. The entire Espanola Basin is also underlain by a highly conductive layer of about 1-OMEGA.m at a depth of 15 km. Both the shallow and deep low-resistivity zones may result from hot, saline fluids. Such fluids deep within the crust may reduce the shear strength of the crust significantly and concentrate crustal extension on the west side of the rift. C1 UNIV TEXAS,PROGRAM GEOSCI,RICHARDSON,TX 75080. UNIV CALIF LOS ALAMOS SCI LAB,DIV EARTH & ENVIRONM SCI,LOS ALAMOS,NM 87545. CTR INVEST CIENT & EDUC SUPER ENSENADA,BAJA CALIFORNIA,MEXICO. GOLDEN W COLL,DEPT PHYS,HUNTINGTON BEACH,CA 92647. PURDUE UNIV,DEPT EARTH & ATMOSPHER SCI,W LAFAYETTE,IN 47907. UNIV CALIF SANTA BARBARA,DEPT GEOL SCI,SANTA BARBARA,CA 93106. SAN DIEGO STATE UNIV,DEPT GEOL SCI,SAN DIEGO,CA 92182. UNIV CALIF RIVERSIDE,INST CRUSTAL STUDIES,RIVERSIDE,CA 92521. RP BIEHLER, S (reprint author), UNIV CALIF RIVERSIDE,DEPT EARTH SCI,RIVERSIDE,CA 92521, USA. NR 61 TC 14 Z9 14 U1 1 U2 12 PU SOC EXPLORATION GEOPHYSICISTS PI TULSA PA 8801 S YALE ST, TULSA, OK 74137 SN 0016-8033 J9 GEOPHYSICS JI Geophysics PD MAR PY 1991 VL 56 IS 3 BP 340 EP 353 DI 10.1190/1.1443048 PG 14 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA FB286 UT WOS:A1991FB28600002 ER PT J AU PETERSON, JE DAVEY, A AF PETERSON, JE DAVEY, A TI CROSSVALIDATION METHOD FOR CROSSWELL SEISMIC TOMOGRAPHY SO GEOPHYSICS LA English DT Article ID ALGEBRAIC RECONSTRUCTION TECHNIQUES RP PETERSON, JE (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,CTR COMPUTAT SEISMOL,DIV EARTH SCI,BERKELEY,CA 94720, USA. NR 7 TC 4 Z9 4 U1 0 U2 0 PU SOC EXPLORATION GEOPHYSICISTS PI TULSA PA 8801 S YALE ST, TULSA, OK 74137 SN 0016-8033 J9 GEOPHYSICS JI Geophysics PD MAR PY 1991 VL 56 IS 3 BP 385 EP 389 DI 10.1190/1.1443055 PG 5 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA FB286 UT WOS:A1991FB28600009 ER PT J AU HALL, SH LUTTRELL, SP CRONIN, WE AF HALL, SH LUTTRELL, SP CRONIN, WE TI A METHOD FOR ESTIMATING EFFECTIVE POROSITY AND GROUNDWATER VELOCITY SO GROUND WATER LA English DT Article AB Estimates of ground-water velocity, based either on Darcy's law or on the single-well drift and pumpback tracer method, require prior knowledge of effective porosity. That is, after field data have been collected, the equation for ground-water velocity, using either method, still contains the two unknowns, velocity and porosity. If the local hydraulic gradient is known and if a drift and pumpback tracer test is conducted at a well whose hydraulic conductivity has been determined, two independent functional relationships between velocity and porosity are established. By treating these functions as nonlinear simultaneous equations, a unique solution for the local velocity and porosity can be obtained. C1 PACIFIC NW LAB, DEPT GEOSCI, RICHLAND, WA 99352 USA. RP HALL, SH (reprint author), PACIFIC NW LAB, CTR EARTH & ENVIRONM SCI, RICHLAND, WA 99352 USA. NR 1 TC 26 Z9 26 U1 1 U2 19 PU GROUND WATER PUBLISHING CO PI COLUMBUS PA 2600 GROUND WATER WAY, COLUMBUS, OH 43219 SN 0017-467X J9 GROUND WATER JI Ground Water PD MAR-APR PY 1991 VL 29 IS 2 BP 171 EP 174 DI 10.1111/j.1745-6584.1991.tb00506.x PG 4 WC Geosciences, Multidisciplinary; Water Resources SC Geology; Water Resources GA FA883 UT WOS:A1991FA88300002 ER PT J AU KAPLAN, E BANERJEE, S RONEN, D MAGARITZ, M MACHLIN, A SOSNOW, M KOGLIN, E AF KAPLAN, E BANERJEE, S RONEN, D MAGARITZ, M MACHLIN, A SOSNOW, M KOGLIN, E TI MULTILAYER SAMPLING IN THE WATER-TABLE REGION OF A SANDY AQUIFER SO GROUND WATER LA English DT Article ID GROUNDWATER SAMPLES AB Depth profiles of organic pollutants, metals, and anions were obtained using a ground-water multilayer sampler (MLS) in a sandy unconfined aquifer contaminated by liquid fuels. The sampler incorporates dialysis membranes and is capable of obtaining vertical profiles with a resolution on the order of few centimeters. Of the eight solutes examined (metals, organics, and anions), all except sulfate exhibited microscale heterogeneities in their concentration over a vertical interval of 200 cm. Chloride, manganese, and iron showed a long linear concentration gradient versus depth which is probably the result of vertical mixing by rainfall input. Maximum concentrations of toluene, xylene, and xylidine at the water table were 17.1, 8.3, and 17.1 mg/l, respectively, decreasing with depth. For toluene and xylene the maximum concentrations found at the water table with the MLS are 40 and 4 times higher, respectively, than those detected at depths greater than 200 cm in water samples obtained with a pump. C1 WEIZMANN INST SCI,IL-76100 REHOVOT,ISRAEL. NEW YORK DEPT ENVIRONM CONSERVAT,AVON,NY 14414. NEW YORK DEPT ENVIRONM CONSERVAT,STONY BROOK,NY 11794. US EPA,ENVIRONM MONITORING & SYST LAB,LAS VEGAS,NV 89193. RP KAPLAN, E (reprint author), BROOKHAVEN NATL LAB,DEPT NUCL ENERGY,DIV RADIOL SCI,UPTON,NY 11973, USA. NR 34 TC 22 Z9 22 U1 0 U2 4 PU GROUND WATER PUBLISHING CO PI COLUMBUS PA 2600 GROUND WATER WAY, COLUMBUS, OH 43219 SN 0017-467X J9 GROUND WATER JI Ground Water PD MAR-APR PY 1991 VL 29 IS 2 BP 191 EP 198 DI 10.1111/j.1745-6584.1991.tb00510.x PG 8 WC Geosciences, Multidisciplinary; Water Resources SC Geology; Water Resources GA FA883 UT WOS:A1991FA88300006 ER PT J AU KORTE, NE KEARL, PM AF KORTE, NE KEARL, PM TI THE UTILITY OF MULTIPLE-COMPLETION MONITORING WELLS FOR DESCRIBING A SOLVENT PLUME SO GROUND WATER MONITORING AND REMEDIATION LA English DT Article AB At a study site in the midwestern United States, multiple-completion wells demonstrated that a vertical hydraulic gradient was responsible for the contamination pattern exhibited by chlorinated solvent plumes. The typical pattern consisted of little or no contamination in the upper portion of the aquifer with concentrations increasing with depth. When ground water contamination was discovered in an unexpected portion of the site, water level elevations and contaminant distribution data obtained from multiple-completion wells resulted in identification of the source location. The well eventually determined to be located in the source area displayed contaminant levels much higher in the upper zone of the aquifer - the opposite contamination pattern of other on-site wells. Such results indicated that the spill had occurred near this location and that solvent residing along the capillary fringe was continuing to contaminate the aquifer. RP KORTE, NE (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,GRAND JUNCT OFF,GRAND JUNCTION,CO 81502, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU GROUND WATER PUBLISHING CO PI COLUMBUS PA 2600 GROUND WATER WAY, COLUMBUS, OH 43219 SN 1069-3629 J9 GROUND WATER MONIT R JI Ground Water Monit. Remediat. PD SPR PY 1991 VL 11 IS 2 BP 153 EP 156 DI 10.1111/j.1745-6592.1991.tb00377.x PG 4 WC Water Resources SC Water Resources GA FH299 UT WOS:A1991FH29900013 ER PT J AU YESLEY, MS AF YESLEY, MS TI VALENCIA, 1990 SO HASTINGS CENTER REPORT LA English DT Note RP YESLEY, MS (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU HASTINGS CENTER PI BRIARCLIFF MANOR PA 255 ELM ROAD, BRIARCLIFF MANOR, NY 10510 SN 0093-0334 J9 HASTINGS CENT REP JI Hastings Cent. Rep. PD MAR-APR PY 1991 VL 21 IS 2 BP 3 EP 4 PG 2 WC Ethics; Health Care Sciences & Services; Medical Ethics; Social Sciences, Biomedical SC Social Sciences - Other Topics; Health Care Sciences & Services; Medical Ethics; Biomedical Social Sciences GA FH331 UT WOS:A1991FH33100004 PM 11642885 ER PT J AU CHIU, SY HUANG, HS PETERS, RW TSAI, SY TSAI, WT SHIEH, SS HSIEH, TY HWANG, LS LIU, SL PENG, CT WU, MH AF CHIU, SY HUANG, HS PETERS, RW TSAI, SY TSAI, WT SHIEH, SS HSIEH, TY HWANG, LS LIU, SL PENG, CT WU, MH TI WASTE MINIMIZATION STUDY FOR A PRINTED-CIRCUIT BOARD MANUFACTURING FACILITY IN TAIWAN SO HAZARDOUS WASTE & HAZARDOUS MATERIALS LA English DT Article AB This paper presents a demonstration of industrial waste minimization sponsored by the Environmental Protection Administration, Taiwan, ROC. Waste reduction opportunities are identified and evaluated for a printed circuit board manufacturing facility in Taiwan. Plant audits were conducted on various processes, such as deburring, alkaline etching, black oxidation, desmearing, electroless copper, and copper and tin/lead plating. Specific areas in which the wastes could be minimized, such as reduction of the amount of dragout and rinse water requirements in the planting and etchant lines and onsite treatment and reuse of spent bath solutions, were identified, assessed, and implemented. Jar tests on the wastewater were performed, and the results were used to improve the efficiency of the wastewater treatment plant for removal of heavy metals and reduction of sludge generation. In addition, administrative controls of hazardous wastes designed to reduce associated health and environmental hazards were recommended. RP CHIU, SY (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 0 TC 1 Z9 1 U1 0 U2 2 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0882-5696 J9 HAZARD WASTE HAZARD JI Hazard. Waste Hazard. Mater. PD SPR PY 1991 VL 8 IS 2 BP 99 EP 114 DI 10.1089/hwm.1991.8.99 PG 16 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA FW401 UT WOS:A1991FW40100002 ER PT J AU MARTINO, L KASZYNSKI, G AF MARTINO, L KASZYNSKI, G TI A COMPARISON OF THE CERCLA RESPONSE PROGRAM AND THE RCRA CORRECTIVE ACTION PROGRAM SO HAZARDOUS WASTE & HAZARDOUS MATERIALS LA English DT Article AB The Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) addresses the reckless hazardous waste disposal practices of the past. The Resource Conservation and Recovery Act (RCRA) addresses the overall management of existing and future hazardous waste handling activities. However, the corrective action authorities granted to the U.S. Environmental Protection Agency with the passage of the most recent RCRA reauthorization statute have led to the creation of a RCRA facility site cleanup program similar to the CERCLA site cleanup program. While most private facilities typically comply with either program during the cleanup of a site, some private facilities and all federal facilities can be required to comply with both regulatory programs during site cleanup. This paper compares and contrasts the more salient aspects of the CERCLA site response program and the RCRA corrective action program. The statutory basis of each cleanup program is discussed. The CERCLA remedial investigation/feasibility program and the RCRA facility assessment/corrective measure study program are detailed. Several issues, criteria, and factors associated with each cleanup program are compared, including regulated universe, regulatory trigger, constituents of concern, programmatic goals for the selection of remedial action, cleanup goals, and natural resource damage assessments. RP MARTINO, L (reprint author), ARGONNE NATL LAB,370 ENFANT PROMENADE SW,SUITE 702,WASHINGTON,DC 20024, USA. NR 0 TC 1 Z9 1 U1 0 U2 2 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0882-5696 J9 HAZARD WASTE HAZARD JI Hazard. Waste Hazard. Mater. PD SPR PY 1991 VL 8 IS 2 BP 161 EP 184 DI 10.1089/hwm.1991.8.161 PG 24 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA FW401 UT WOS:A1991FW40100007 ER PT J AU MCINROY, JF KATHREN, RL VOELZ, GL SWINT, MJ AF MCINROY, JF KATHREN, RL VOELZ, GL SWINT, MJ TI UNITED-STATES-TRANSURANIUM-REGISTRY REPORT ON THE PU-239 DISTRIBUTION IN A HUMAN-BODY SO HEALTH PHYSICS LA English DT Article ID TRANS-URANIUM REGISTRY; PROJECT PLUTONIUM WORKERS; MEDICAL FOLLOW-UP; SKELETON; AM-241; PU AB The distribution of Pu-239 in a human whole body is reported. The body contained 246 Bq of Pu-239 of which 130 Bq (52.8%) was found in the lungs and associated lymph nodes. Of the remaining 116 Bq (47.2%) that constituted the systemic deposition, 51.2 Bq (44%) were in the skeleton, 48.6 Bq (42%) in the liver, and the remainder (14%) in the rest of the body exclusive of the lungs and associated lymph nodes. An unexpectedly high concentration was observed in the pituitary. The systemic distribution of Pu in this case, when combined with the exposure history, is suggestive of an initial partitioning ratio of Pu-239 between skeleton and liver of less than unity, and a tentative initial distribution from the transfer compartment of 25% to the skeleton, 50% to the liver, and 25% to the rest of the body and early excretion is proposed for this case. Older biokinetic models, when used with the available urinalysis data for this case, typically overestimated the deposition when compared with the tissue analysis results, but more recent models provided estimates in close agreement with the autopsy results. C1 US TRANSURANIUM REGISTRY, HANFORD ENVIRONM HLTH FDN, RICHLAND, WA 99352 USA. RP MCINROY, JF (reprint author), UNIV CALIF LOS ALAMOS SCI LAB, LOS ALAMOS, NM 87545 USA. RI WSU, USTUR/I-1056-2013 NR 34 TC 13 Z9 13 U1 0 U2 1 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD MAR PY 1991 VL 60 IS 3 BP 307 EP 333 DI 10.1097/00004032-199103000-00001 PG 27 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 EY911 UT WOS:A1991EY91100001 PM 1847360 ER PT J AU FISHER, DR KATHREN, RL SWINT, MJ AF FISHER, DR KATHREN, RL SWINT, MJ TI MODIFIED BIOKINETIC MODEL FOR URANIUM FROM ANALYSIS OF ACUTE EXPOSURE TO UF6 SO HEALTH PHYSICS LA English DT Article ID METABOLISM; TISSUES AB Urinalysis measurements from 31 workers acutely exposed to uranium hexafluoride (UF6) and its hydrolysis product UO2F2 (during the 1986 Gore, Oklahoma UF6-release accident) were used to develop a modified recycling biokinetic model for soluble U compounds. The model is expressed as a five-compartment exponential equation: y(u)(t) = 0.86e-2.77t + 0.0048e-0.116t + 0.00069e-0.0267t + 0.00017e-0.00231t + 2.5 x 10(-6)e-0.000187t, where y(u)(t) is the fractional daily urinary excretion and t is the time after intake, in days. The excretion constants of the five exponential compartments correspond to residence half-times of 0.25, 6, 26, 300, and 3,700 d in the lungs, kidneys, other soft tissues, and in two bone volume compartments, respectively. The modified recycling model was used to estimate intake amounts, the resulting committed effective dose equivalent, maximum kidney concentrations, and dose equivalent to bone surfaces, kidneys, and lungs. C1 HANFORD ENVIRONM HLTH FDN, RICHLAND, WA 99352 USA. RP FISHER, DR (reprint author), PACIFIC NW LAB, DEPT HLTH PHYS, RICHLAND, WA 99352 USA. RI WSU, USTUR/I-1056-2013 NR 23 TC 14 Z9 14 U1 0 U2 1 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD MAR PY 1991 VL 60 IS 3 BP 335 EP 342 DI 10.1097/00004032-199103000-00002 PG 8 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA EY911 UT WOS:A1991EY91100002 PM 1995506 ER PT J AU BERVEN, BA LITTLE, CA BLAIR, MS AF BERVEN, BA LITTLE, CA BLAIR, MS TI A METHOD TO AUTOMATE RADIOLOGICAL SURVEYS - THE ULTRASONIC RANGING AND DATA SYSTEM SO HEALTH PHYSICS LA English DT Article AB The Ultrasonic Ranging and Data System (USRADS) was developed to allow radiation exposure rate data and positional information to be simultaneously collected, stored, and analyzed in a manner more efficient than conventional survey techniques. USRADS is field portable using ultrasonics to locate a field surveyor on a site and radiofrequency to transmit data. Surveyor position (e.g., measurement location within 10 cm) and an integrated instrument measurement are recorded and stored once each second in a microcomputer. Operational experience indicates that the system results in collection of greater quantity and higher quality of radiological data with less effort in data transcription and analysis and only slightly more field effort compared to conventional manual methods. RP BERVEN, BA (reprint author), OAK RIDGE NATL LAB, DIV HLTH & SAFETY RES, OAK RIDGE, TN 37831 USA. NR 5 TC 2 Z9 2 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD MAR PY 1991 VL 60 IS 3 BP 367 EP 373 DI 10.1097/00004032-199103000-00006 PG 7 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA EY911 UT WOS:A1991EY91100006 PM 1995509 ER PT J AU CHEN, SY AF CHEN, SY TI CALCULATION OF EFFECTIVE DOSE-EQUIVALENT RESPONSES FOR EXTERNAL EXPOSURE FROM RESIDUAL PHOTON EMITTERS IN SOIL SO HEALTH PHYSICS LA English DT Article ID RATE CONVERSION FACTORS; TIME DEPENDENCES; RADIONUCLIDES AB Effective dose-equivalent responses have been calculated for external exposure from residual photon emitters in soil. The calculations are based on the assumption that the receptor is located 1 m above the contaminated ground. A Monte Carlo algorithm was developed to perform the photon transport calculation for the soil/air configuration, in which the soil constituents were assumed to be similar to those of the earth's crust. Photon cross-sections for soil were based on the latest cross-sectional information generated by the U.S. National Institute of Standards and Technology. For every incident photon at the receptor, an estimate of the air-absorbed dose was calculated first and then converted into the effective dose equivalent. The effective dose equivalent is based on the concept of weighted organ doses, as recommended by the ICRP. The ICRP's latest conversion coefficients were used to transform point air-absorbed doses into effective dose equivalents. Baseline effective dose responses were obtained for monoenergetic photon sources assumed to be distributed uniformly in soil for energies ranging from 0.01 to 10 MeV, soil thicknesses from 0 to 5 mean-free-path (mfp) lengths, and soil densities from 1 to 2 g cm-3. On the basis of the calculated dose responses, empirical relationships were obtained for correlating the dose responses with the soil depths and densities for each source energy. The derived correlations contain a convenient exponential form that describes the depth-dose relationship for an estimated accuracy within about 15%; soil densities show an inverse relationship with dose responses. Results of the effective dose-equivalent response can be used to calculate effective dose-equivalent responses for gamma-emitting radionuclides that are commonly identified as residual radioactive materials in soil. RP CHEN, SY (reprint author), ARGONNE NATL LAB, DIV ENVIRONM ASSESSMENT & INFORMAT SCI, ARGONNE, IL 60439 USA. NR 25 TC 28 Z9 28 U1 0 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 MAR PY 1991 VL 60 IS 3 BP 411 EP 426 DI 10.1097/00004032-199103000-00011 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 EY911 UT WOS:A1991EY91100011 PM 1995513 ER PT J AU LUCAS, HF MARKUN, F RUNDO, J AF LUCAS, HF MARKUN, F RUNDO, J TI RADON GRAB SAMPLING USING AN AEROSOL CAN SO HEALTH PHYSICS LA English DT Note RP LUCAS, HF (reprint author), ARGONNE NATL LAB, ARGONNE, IL 60439 USA. NR 7 TC 1 Z9 1 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 MAR PY 1991 VL 60 IS 3 BP 443 EP 445 DI 10.1097/00004032-199103000-00015 PG 3 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA EY911 UT WOS:A1991EY91100015 PM 1995517 ER PT J AU GAILLARD, G BACH, P BALL, J BINZ, R BYSTRICKY, J DEMIERRE, P FONTAINE, JM GOUDOUR, JP HESS, R KLETT, A KUNNE, R LAC, CD LEHAR, F DELESQUEN, A LOPIANO, D DEMALI, M PERROT, F PESCHINA, R RAPIN, D ROSSLE, E VANROSSUM, L SCHMITT, H SORMANI, P SPINKA, H AF GAILLARD, G BACH, P BALL, J BINZ, R BYSTRICKY, J DEMIERRE, P FONTAINE, JM GOUDOUR, JP HESS, R KLETT, A KUNNE, R LAC, CD LEHAR, F DELESQUEN, A LOPIANO, D DEMALI, M PERROT, F PESCHINA, R RAPIN, D ROSSLE, E VANROSSUM, L SCHMITT, H SORMANI, P SPINKA, H TI THE NUCLEON - NUCLEON PROGRAM AT SATURNE-II SO HELVETICA PHYSICA ACTA LA English DT Article; Proceedings Paper CT AUTUMN MEETING OF THE SOC-SUISSE-DE-PHYSIQUE CY OCT 03-04, 1990 CL GENEVA, SWITZERLAND SP SOC SUISSE PHYS AB The aim of the Nucleon-Nucleon program is to obtain the Nucleon-Nucleon amplitudes, either via Phase Shift Analyses or direct reconstruction. To this end, a large number of polarization observables, including spin transfer and 3-spin parameters, have been measured at Saturne II in neutron-proton elastic scattering, between 800 and 1100 MeV, using the free polarized neutron beam, obtained by breaking up of polarized deuterons. The analysis is still in a early stage, but, nevertheless, it has already been possible to reconstruct the neutron-proton amplitudes at 3 angles, at 840 and 880 MeV. C1 CENS,LNS,F-91191 GIF SUR YVETTE,FRANCE. UNIV FREIBURG,W-7800 FREIBURG,GERMANY. CENS,DPHN,ME,F-91191 GIF SUR YVETTE,FRANCE. UNIV BORDEAUX 1,F-33405 TALENCE,FRANCE. ARGONNE NATL LAB,HEP,ARGONNE,IL 60439. RP GAILLARD, G (reprint author), UNIV GENEVA,DPNC,CH-1211 GENEVA 4,SWITZERLAND. NR 3 TC 0 Z9 0 U1 0 U2 0 PU BIRKHAUSER VERLAG AG PI BASEL PA PO BOX 133 KLOSTERBERG 23, CH-4010 BASEL, SWITZERLAND SN 0018-0238 J9 HELV PHYS ACTA JI Helv. Phys. Acta PD MAR PY 1991 VL 64 IS 2 BP 201 EP 202 PG 2 WC Physics, Multidisciplinary SC Physics GA FH879 UT WOS:A1991FH87900025 ER PT J AU TUCKER, AD FRAZER, NB AF TUCKER, AD FRAZER, NB TI REPRODUCTIVE VARIATION IN LEATHERBACK TURTLES, DERMOCHELYS-CORIACEA, AT CULEBRA-NATIONAL-WILDLIFE-REFUGE, PUERTO-RICO SO HERPETOLOGICA LA English DT Article DE DERMOCHELYS-CORIACEA; LEATHERBACK; SEA TURTLE; CLUTCH SIZE; CLUTCH FREQUENCY ID CHELONIA-MYDAS; CARETTA-CARETTA; GREEN TURTLE; CLUTCH SIZE; COSTA-RICA; LOGGERHEAD TURTLES; CUMBERLAND ISLAND; SEA TURTLES; TORTUGUERO; POPULATION AB Clutch size, clutch frequency, and carapace length were examined for leatherback turtles, Dermochelys coriacea, nesting at Culebra National Wildlife Refuge, Puerto Rico, from 1984-1987. There were no significant differences in mean clutch frequency, mean clutch size, or mean carapace length of females among years. Clutch frequency showed a significant positive correlation with body size, but there was no significant correlation between clutch size and body size. Returning turtles that had been tagged in previous seasons (remigrants) had higher clutch frequencies than those never before seen nesting on Culebra (neophytes). However, there was no significant difference in body size between remigrants and neophytes. C1 UNIV GEORGIA,DEPT ZOOL,ATHENS,GA 30602. MERCER UNIV,DEPT BIOL,MACON,GA 31207. RP TUCKER, AD (reprint author), SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802, USA. NR 37 TC 22 Z9 23 U1 0 U2 3 PU HERPETOLOGISTS LEAGUE PI JOHNSON CITY PA EAST TENNESSEE STATE UNIV, DEPT BIOLOGICAL SCIENCES, BOX 70726, JOHNSON CITY, TN 37614-0726 SN 0018-0831 J9 HERPETOLOGICA JI Herpetologica PD MAR PY 1991 VL 47 IS 1 BP 115 EP 124 PG 10 WC Zoology SC Zoology GA GK037 UT WOS:A1991GK03700015 ER PT J AU MELLOCH, MR HARMON, ES EMERY, KA AF MELLOCH, MR HARMON, ES EMERY, KA TI LARGE-AREA, 8-CM(2) GAAS SOLAR-CELLS FABRICATED FROM MBE MATERIAL SO IEEE ELECTRON DEVICE LETTERS LA English DT Article ID MOLECULAR-BEAM EPITAXY AB A GaAs solar cell of area 2 x 4 cm2 was fabricated from a film grown by molecular beam epitaxy (MBE) on a 5.08-cm-diameter GaAs substrate. This is the largest device ever fabricated from MBE material. The cell demonstrated an efficiency of 21.7% under one-sun AM1.5 conditions at 25-degrees-C and 18.8% under one-sun AM0 conditions at 28-degrees-C. C1 SOLAR ENERGY RES INST,GOLDEN,CO 80401. RP MELLOCH, MR (reprint author), PURDUE UNIV,SCH ELECT ENGN,W LAFAYETTE,IN 47907, USA. NR 18 TC 12 Z9 12 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 0741-3106 J9 IEEE ELECTR DEVICE L JI IEEE Electron Device Lett. PD MAR PY 1991 VL 12 IS 3 BP 137 EP 139 DI 10.1109/55.75736 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA EY438 UT WOS:A1991EY43800017 ER PT J AU CANDY, JV PICHOT, C AF CANDY, JV PICHOT, C TI ACTIVE MICROWAVE IMAGING - A MODEL-BASED APPROACH SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article ID DIFFRACTION TOMOGRAPHY AB A model-based approach to improve the spatial resolution of a buried inhomogeneous object using an active microwave imaging system is discussed. First, by numerically solving an integral equation representing the ideal scattered field of the object, we generate the model. Next using this model we develop an optimal spatial filter to process the measured field. Finally, the so-called inverse problem is solved using an imaging algorithm based on diffraction tomography and Fourier transforms. Experimental results indicate a reasonable performance of the approach. C1 ECOLE SUPER ELECT,CNRS,SIGNAUX & SYST LAB,F-91190 GIF SUR YVETTE,FRANCE. RP CANDY, JV (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 17 TC 16 Z9 16 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD MAR PY 1991 VL 39 IS 3 BP 285 EP 290 DI 10.1109/8.76323 PG 6 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA FF902 UT WOS:A1991FF90200002 ER PT J AU KANG, YG UPADHYAY, AK STEPHENS, DL AF KANG, YG UPADHYAY, AK STEPHENS, DL TI ANALYSIS AND DESIGN OF A HALF-BRIDGE PARALLEL RESONANT CONVERTER OPERATING ABOVE RESONANCE SO IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS LA English DT Article AB A half-bridge parallel resonant converter (PRC) operating above resonance is analyzed in detail to provide more straightforward and easy-to-use design tools. Closed-form solutions are derived for the PRC under steady-state conditions. Resonant component selection criteria is provided. Various design parameters derived from the results of the analysis are presented in the form of normalized design graphs to directly determine the component ratings. Using these design graphs, a step-by-step design procedure for a 100-kHz, 150-W, multioutput switching power supply is given and implemented for verification of theoretical results. C1 MOTOROLA LIGHTING INC,BUFFALO GROVE,IL 60089. RP KANG, YG (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 6 TC 12 Z9 12 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-9994 J9 IEEE T IND APPL JI IEEE Trans. Ind. Appl. PD MAR-APR PY 1991 VL 27 IS 2 BP 386 EP 395 DI 10.1109/28.73630 PG 10 WC Engineering, Multidisciplinary; Engineering, Electrical & Electronic SC Engineering GA FD038 UT WOS:A1991FD03800028 ER PT J AU ZASADZINSKI, JF TRALSHAWALA, N HUANG, Q GRAY, KE HINKS, DG AF ZASADZINSKI, JF TRALSHAWALA, N HUANG, Q GRAY, KE HINKS, DG TI TUNNELING SPECTROSCOPY MEASUREMENTS ON LOW-LEAKAGE JUNCTIONS OF ND1.85CE0.15CUO4-Y AND BA1-XKXBIO3 SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID SUPERCONDUCTING STATES AB Tunneling measurements are reported for Nd1.85Ce0.15CuO4-y (NCCO) and Ba1-xK(x)BiO3 (BKBO) using the point-contact technique with a Au or Nb tip. The junctions display very low zero-bias conductance values of < 1% for BKBO and approximately 10% for NCCO, and show sharp conductance peaks at eV = +/- DELTA. In the case of BKBO, the normalized conductance can be fit with a BCS density of states with thermal smearing only. The energy gaps are in good agreement with optical measurements and lead to values of 2-DELTA/kT(c) in the range of 3.5 - 4.0 for both compounds implying moderate coupling strength. The tunneling conductance data at high bias voltages display reproducible structures which are characteristic of phonon effects as found in conventional superconductors. We have obtained the Eliashberg functions, alpha-2F(omega), and the resulting values of lambda determined from this analysis are consistent with the measured values of the strong-coupling ratio, 2-DELTA/kT(c). We conclude that the pairing mechanism in both materials is principally phonon mediated. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP ZASADZINSKI, JF (reprint author), IIT,CHICAGO,IL 60616, USA. NR 12 TC 12 Z9 12 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 833 EP 836 DI 10.1109/20.133304 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200005 ER PT J AU WOLF, SA KRESIN, VZ AF WOLF, SA KRESIN, VZ TI MAJOR PARAMETERS OF HIGH-TC OXIDES SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID SUPERCONDUCTORS AB The major normal and superconducting parameters of several cuprate superconductors are evaluated and discussed. The effects of the two-gap structure in Y1Ba2Cu3O7 are especially emphasized. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP WOLF, SA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009 NR 15 TC 6 Z9 6 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 852 EP 853 DI 10.1109/20.133308 PN 2 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200010 ER PT J AU COOKE, DW ARENDT, PN GRAY, ER MAYER, A BROWN, DR ELLIOTT, NE REEVES, GA PORTIS, AM AF COOKE, DW ARENDT, PN GRAY, ER MAYER, A BROWN, DR ELLIOTT, NE REEVES, GA PORTIS, AM TI HIGH-FREQUENCY PROPERTIES OF T-LAMBDA-BASED SUPERCONDUCTORS DEPOSITED ONTO LARGE-AREA-METALLIC SUBSTRATES SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM AB Microwave surface resistance measurements were made on large-area (11.4 cm2) Tl-Ba-Ca-Cu-O thick films (approximately 10-mu-m) which were magnetron sputtered onto oriented Ag alloy (Consil 995) substrates. Initial films were prepared by depositing a BaF2 buffer layer between the superconducting film and the substrate to control the film/substrate interaction; however, films exhibiting the best microwave properties were prepared without a buffer layer. Surface resistance measurements were made by replacing the end wall of an 18-GHz Cu cavity (TE011 mode) with the superconducting film. The best surface resistance values obtained on the unbuffered film were 4 and 14 m-OMEGA at 10 K and 77 K, respectively; the corresponding Cu values are 8 m-OMEGA and 21 m-OMEGA. The dependence of surface resistance on surface magnetic field was measured in a similar way except that a Nb cavity was used instead of a Cu one. Films exhibiting the highest degree of c-axis texturing show the weakest dependence of surface resistance on magnetic field and also exhibit the sharpest high-frequency transition into the superconducting state. These results are important for potential cavity applications of these materials. C1 UNIV CALIF BERKELEY,BERKELEY,CA 94720. RP COOKE, DW (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 18 TC 6 Z9 6 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 880 EP 883 DI 10.1109/20.133314 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200016 ER PT J AU KRESIN, VZ AF KRESIN, VZ TI HIGH-TC SUPERCONDUCTOR IN AN AC FIELD SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM AB Microwave properties of the high T(c) oxides are studied. The frequency and temperature dependences of the impedance are obtained. Short coherence length leads to large losses. The effects of impurities and multi-gap structures are discussed. The impedance of the proximity system is calculated. The presence of the acoustic plasmon branch leads to intrinsic residual losses. RP KRESIN, VZ (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 13 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 888 EP 889 DI 10.1109/20.133316 PN 2 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200018 ER PT J AU MILLER, TA SCHWARTZKOPF, LA OSTENSON, JE FINNEMORE, DK RIGHI, J GLEIXNER, RA ZEIGLER, D AF MILLER, TA SCHWARTZKOPF, LA OSTENSON, JE FINNEMORE, DK RIGHI, J GLEIXNER, RA ZEIGLER, D TI MICROFILAMENTARY CONDUCTOR BASED ON BI(2212) SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM AB A series of ex-situ prepared microfilamentary conductors have been prepared to determine the optimum heat treatment sequence for the development of a strain tolerant microfilamentary conductor based on Bi2Sr2Ca1Cu2O8-delta. In this work, both monolithic tapes and the microfilamentary composites were prepared so that the difference between the two methods for the same heat treatment could be evaluated. The monolithic tapes are easy to fabricate and are used to provide a rough guide to the desired degree of melting and the optimum oxygen concentration needed for the highest critical current densities. One of the ex-situ microfilamentary composities showed a critical current density of 5000 A/cm2 at 4.2K while subjected to a strain exceeding 1%. C1 IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. BABCOCK & WILCOX CO,RES CTR,ALLIANCE,OH 44601. RP MILLER, TA (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 12 TC 3 Z9 3 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 909 EP 911 DI 10.1109/20.133323 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200024 ER PT J AU OREHOTSKY, J WIESMANN, H MOODENBAUGH, AR SUENAGA, M WANG, HG HERMAN, H AF OREHOTSKY, J WIESMANN, H MOODENBAUGH, AR SUENAGA, M WANG, HG HERMAN, H TI MICROSTRUCTURES AND DC CRITICAL CURRENTS IN TEXTURED Y-BA-CU-OXIDES SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID SUPERCONDUCTORS AB Sintered bars of Y-Ba-Cu oxide were partially melted using a quartz halogen lamp zone heating apparatus. The resulting multiphase samples showed varying degrees of "melt texturing." It was found that the addition of YBa2CuO5 powders to the sintered YBa2Cu3O7 prior to the zone melting process enhanced the growth of large textured grains. The best value of the critical current density was approximately 10(3) A/cm2 at 1.0 T and 77K for the starting composition of YBa2Cu3O7 . (0.2) Y2BaCuO5. C1 SUNY STONY BROOK,STONY BROOK,NY 11794. RP OREHOTSKY, J (reprint author), BROOKHAVEN NATL LAB,DIV MAT SCI,UPTON,NY 11973, USA. OI Moodenbaugh, Arnold/0000-0002-3415-6762 NR 11 TC 6 Z9 6 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 914 EP 916 DI 10.1109/20.133326 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200026 ER PT J AU JACOBS, KR MILLER, TA FINNEMORE, DK GOLDMAN, AI LEBEAU, SE RIGHI, J AF JACOBS, KR MILLER, TA FINNEMORE, DK GOLDMAN, AI LEBEAU, SE RIGHI, J TI CRYSTALLIZATION OF BI2SR2CACU2OX SUPERCONDUCTING FILAMENTS PRODUCED BY GAS-JET FIBERIZATION SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID BI AB X-ray diffraction and differential thermal analysis techniques have been used to investigate the recrystallization products obtained from various heat treatments of glassy Bi2Sr2CaCu2O(x) filaments produced by the gas-jet fiberization process. In both Pb-doped and Pb-free samples, the 85K superconducting phase appears after the formation of a disordered Bi2Sr2CuO(x)-like intermediate phase at lower temperature. The c-lattice parameter of this phase is substantially smaller than the published values for Bi2Sr2CuO(x) and increases as the temperature of the heat treatment increases. After heat treatment at 600-degrees-C, a Pb-rich second phase is found together with the 2201-like intermediate phase in the Pb-doped material. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. BABCOCK & WILCOX CO,RES CTR,ALLIANCE,OH 44601. RP JACOBS, KR (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 13 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 917 EP 919 DI 10.1109/20.133961 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200027 ER PT J AU KRAMER, MJ ARRASMITH, SR AF KRAMER, MJ ARRASMITH, SR TI EVALUATION OF TECHNIQUES FOR FABRICATING VERY FINE-GRAINED YBA2CU3O7-DELTA+AG COMPOSITES SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID OXIDE AB We have compared several blending techniques to make Ag + YBa2Cu3O7-delta (Y123) composites. A chemical precipitation route appears to give the best dispersion of the Ag but appears to cause some decomposition of the finer grained fraction of the Y123. The lower intergranular porosity in these composites reduces the O2 uptake in these samples, necessitating longer oxygen anneals. Long oxygen anneals for the composites can be avoided by first sintering the Y123 with an oxygen anneal and then blending in the Ag. RP KRAMER, MJ (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT MET & CERAM,AMES LAB,AMES,IA 50011, USA. NR 9 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 920 EP 922 DI 10.1109/20.133328 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200028 ER PT J AU SANDERS, SC MILLER, TA KRAMER, MJ CHUMBLEY, LS AF SANDERS, SC MILLER, TA KRAMER, MJ CHUMBLEY, LS TI STRUCTURAL CHARACTERISTICS OF GRAIN-BOUNDARIES IN SUPERCONDUCTING BI2SR2CA1CU2OX FIBERS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM AB Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) have been used to study grain morphology and grain boundaries in superconducting Bi2Sr2CaCu2Ox fibers produced by gas jet fiberization. The narrowest fibers are composed of chains of platelets about 5x3x0.2-mu-m3 oriented such that the long direction in each platelet is primarily parallel to the fiber axis. Each platelet has one crystallographic orientation, with the c-axis corresponding to the thin direction. These crystallites commonly join via large-angle (001) twist boundaries, where the ab-planes are parallel but rotated about the c-axis with respect to the next crystallite. More complicated boundaries are also observed. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. RP SANDERS, SC (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,DEPT PHYS,AMES,IA 50011, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 939 EP 941 DI 10.1109/20.133333 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200033 ER PT J AU KINGSTON, JJ WELLSTOOD, FC QUAN, D CLARKE, J AF KINGSTON, JJ WELLSTOOD, FC QUAN, D CLARKE, J TI PHOTOLITHOGRAPHICALLY PATTERNED THIN-FILM MULTILAYER DEVICES OF YBA2CU3O7-X SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID QUANTUM INTERFERENCE DEVICES AB We have fabricated thin-film YBa2Cu3O7-x-SrTiO3-YBa2Cu3O7-x multilayer interconnect structures in which each in situ laser-deposited film is independently patterned by photolithography. In particular, we have constructed the two key components necessary for a superconducting multilayer interconnect technology, crossovers and window contacts. As a further demonstration of the technology, we have fabricated a thin-film flux transformer, suitable for use with a Superconducting QUantum Interference Device (SQUID), that includes a ten-turn input coil with 6-mu-m linewidth. Transport measurements showed that the critical temperature was 87K and the critical current was 135-mu-A at 82K. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720. RP KINGSTON, JJ (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Joint Quantum Institute, NIST/UMD/H-4494-2011 NR 12 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 974 EP 977 DI 10.1109/20.133342 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200041 ER PT J AU XI, XX VENKATESAN, T LI, Q WU, XD INAM, A CHANG, CC RAMESH, R HWANG, DM RAVI, TS FINDIKOGLU, A HEMMICK, D ETEMAD, S MARTINEZ, JA WILKENS, B AF XI, XX VENKATESAN, T LI, Q WU, XD INAM, A CHANG, CC RAMESH, R HWANG, DM RAVI, TS FINDIKOGLU, A HEMMICK, D ETEMAD, S MARTINEZ, JA WILKENS, B TI PREPARATION OF THIN-FILM HIGH-TEMPERATURE SUPERCONDUCTORS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID PULSED LASER DEPOSITION; HIGH-TC; GROWTH; EVAPORATION; DEVICES AB Fundamental issues in preparing high quality high T(c) YBa2Cu3O7-x thin films are addressed. The techniques of inverted cylindrical magnetron sputtering and pulsed laser deposition are chosen as successful examples to illustrate how the key problems can be solved. The fabrication of YBa2Cu3O7-x/PrBa2Cu3O7-x superlattices where superconductivity in a single unit cell layer of YBa2Cu3O7-x was observed demonstrates the state of the art of thin film deposition of high T(c) materials. Systematic variations of the deposition parameters result in changes of superconducting and structural properties of the films that correlate with their microwave and infrared characteristics. C1 BELLCORE,RED BANK,NJ 07701. UNIV CALIF LOS ALAMOS SCI LAB,ERDC,LOS ALAMOS,NM 87545. RP XI, XX (reprint author), RUTGERS STATE UNIV,DEPT PHYS,PISCATAWAY,NJ 08854, USA. RI Venkatesan, Thirumalai/E-1667-2013 NR 38 TC 32 Z9 33 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 982 EP 989 DI 10.1109/20.133345 PN 2 PG 8 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200043 ER PT J AU LESSURE, HS SIMIZU, S BAUMERT, BA SANKAR, SG MCHENRY, ME MALEY, MP COST, JR WILLIS, JO AF LESSURE, HS SIMIZU, S BAUMERT, BA SANKAR, SG MCHENRY, ME MALEY, MP COST, JR WILLIS, JO TI FLUX PINNING IN NEUTRON-IRRADIATED YBA2CU3O7-X SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID CREEP; CRYSTAL AB Identical polycrystalline samples of YBa2Cu3O7-x have been irradiated with fast neutrons (E > 0.1 Mev) in eight steps between 0 and 2.1 x 10(18) n/cm2. Notable irradiation effects include a T(c) depression of nearly 2 K at the highest fluence and large improvements in the critical current density for fields from 0-9 and temperatures between 4-80 K. Critical currents approaching 2 x 10(7) A/cm2 are observed for optimally irradiated materials at 5K (in zero field) while at 77 K, J(c)(0kOe) approaches 5 x 10(5) A/cm2. Irradiation is seen to take a nearly equilibrium magnetization curve at 77 K and broaden it to a significantly hysteretic curve. A substantial shift in the effective pinning potential as a function of current density is inferred from magnetic relaxation measurements at H = 1T. This is the first such measurement in which systematically increased activation energies for flux creep (as a function of current density) are noted. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP LESSURE, HS (reprint author), CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213, USA. RI McHenry, Michael/B-8936-2009 NR 17 TC 8 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1043 EP 1046 DI 10.1109/20.133357 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200057 ER PT J AU MULLER, H WIESMANN, HJ SUENAGA, M AF MULLER, H WIESMANN, HJ SUENAGA, M TI OBSERVATIONS OF VORTEX STRUCTURE IN YBA2CU3O7 SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM AB The remnant magnetic flux distributions in a single crystal and a sintered polycrystal was examined using the magnetic particle decoration technique. The single crystal, which was heavily twinned, showed only local order in the flux lattice. This was probably due to lattice distortions caused by interaction between twin boundaries and fluxons. In the polycrystal, flux pinning effectiveness was seen to vary significantly between grains, depending on size and orientation. Grains with the c axis nearly perpendicular to the applied magnetic field were most effective at pinning flux. Some features of the decoration patterns implied that the flux distribution was influenced by more than just the grains at the sample surface. RP MULLER, H (reprint author), BROOKHAVEN NATL LAB,DIV MAT SCI,UPTON,NY 11973, USA. NR 5 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1076 EP 1079 DI 10.1109/20.133365 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200066 ER PT J AU SHI, DG CHEN, JG MING, X MCGINN, PJ CHEN, WH GORETTA, KC AF SHI, DG CHEN, JG MING, X MCGINN, PJ CHEN, WH GORETTA, KC TI CRITICAL CURRENTS, MAGNETIC-RELAXATION, AND MICROSTRUCTURE IN ZONE-MELTED YBA2CU3OX SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID SUPERCONDUCTORS AB Extruded YBa2Cu3O(X) wires have been zone-melted to develop highly textured microstructures. The zone-melted wires exhibit large magnetic hysteresis and transport J(c) values relative to conventional bulk YBa2Cu3O(X). Transmission electron microscopy observations indicate unique grain boundary features which are likely to be responsible for reduced weak-link effects. Large amounts of intragranular defects such as dislocations and Y2BaCuO5 particles have been observed in the sample matrices. The dislocations are possibly connected with the greatly increased magnetic hysteresis. C1 UNIV NOTRE DAME,NOTRE DAME,IN 46556. RP SHI, DG (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 11 TC 4 Z9 6 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1080 EP 1082 DI 10.1109/20.133366 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200067 ER PT J AU HAO, ZD CLEM, JR AF HAO, ZD CLEM, JR TI VISCOUS FLUX MOTION IN ANISOTROPIC TYPE-II SUPERCONDUCTORS IN LOW FIELDS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article AB The Bardeen-Stephen model of viscous flux motion in isotropic type-II superconductors is extended to the anisotropic case characterized by a phenomenological effective mass tensor m(ij). When the magnetic field is low and the vortex lines are aligned along one of the three principal axes, simple expressions for the viscosity tensor eta-ij of the viscous flux motion are obtained as functions of m(ij) and the normal state conductivity tensor sigma-ij for temperature T close to the critical temperature T(c). For the high-temperature oxide superconductors the theory predicts that eta-b(a) : eta-c(a) almost-equal-to 1:4-gamma:3-gamma-2, where eta-i(j) is the viscosity for the motion along the i-axis of a vortex parallel to the j-axis and gamma = square-root m(c)/m(a) is the anisotropy parameter (m(i), i = a, b, c, are the principal values of the mass tensor satisfying m(a) almost-equal-to m(b) << m(c)). C1 IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS, AMES, IA 50011 USA. RP IOWA STATE UNIV SCI & TECHNOL, US DOE, AMES LAB, AMES, IA 50011 USA. NR 9 TC 35 Z9 35 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9464 EI 1941-0069 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1086 EP 1088 DI 10.1109/20.133368 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200069 ER PT J AU WELCH, DO AF WELCH, DO TI A THEORETICAL COMPARISON OF THE EFFECTS OF THE SHAPE OF THE PINNING POTENTIAL AND A DISTRIBUTION OF PINNING ENERGIES ON THE APPARENT PINNING ENERGY AS MEASURED BY MAGNETIC-FLUX CREEP SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID HIGH-TC SUPERCONDUCTORS; MOTION AB In the analysis of magnetic flux creep experiments it is assumed that, at a given temperature, the pinning energy, which must be overcome by thermal activation, depends on the magnetic induction and its gradient by U(B,}}}}}B)approximately-or-almost-equal-to U(p)(B) [1-}}}}}B/}}}}}B(max))]n inverted-open-triangle B/inverted-open-triangle B(max))]n where U(p) is the pinning well depth and }}}}}B(max) corresponds to the critical current density with no thermal activation. Customarily, n is assumed to be unity and any unusual temperature dependence of U(p) is then ascribed to a distribution of well depths. However, realistic assumptions about the shape of the pinning potential yield 3/2 lesser-than-or-approximately-equal-to-n lesser-than-or-approximately-equal-to 2, which yields an apparent distribution of well depths in the conventional analysis. Simple models will be used to illustrate the characteristics of these two quite different origins for the apparent temperature dependence of well depth obtained from magnetic flux creep rates. RP WELCH, DO (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 14 TC 41 Z9 41 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1133 EP 1138 DI 10.1109/20.133382 PN 2 PG 6 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200081 ER PT J AU MALEY, MP VOGT, GJ PHILLIPS, DS COULTER, JY ARENDT, PN ELLIOT, NE AF MALEY, MP VOGT, GJ PHILLIPS, DS COULTER, JY ARENDT, PN ELLIOT, NE TI TRANSPORT CRITICAL CURRENT DENSITIES IN BULK TL2BA2CA1CU2OX - DEPENDENCE ON MICROSTRUCTURE AND NEUTRON-IRRADIATION DAMAGE SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID BA-CU-O AB We report investigations of the dependence of transport critical current density, J(c), upon magnetic field, B at 4, 64 and 75 K in a bulk ceramic sample of T1(2)Ba2Ca2Cu3O(x) and in a polycrystalline, textured thin film of T1(2)Ba2CaCu2O(x). In ceramic samples of T1-2223 we generally observe the double-step J(c) versus B characteristic first pointed out by Ekin, in which J(c) drops from its zero field value to a plateau reached at B approximately 100 Oe. The plateau region then extends to a higher field B* (T) beyond which J(c) (B) decreases monotonically. We have achieved plateau J(c) (75 K, 1.OT) values > 300 A/cm2 with B* (75 K) approximately 1.5 T. In these samples a pronounced peak effect is observed in which J(c) (B) increases monotonically with increasing B for 100 < B(O(e)) < B*. After neutron irradiation, we observe B* to be significantly enhanced suggesting that B* signals the onset of rapid flux creep. Our textured polycrystalline film shows enhanced values of J(c) approximately 2 x 10(5) A/cm2 at 64 K, OT and the absence of "weak link" behavior. RP MALEY, MP (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 7 TC 5 Z9 5 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1139 EP 1142 DI 10.1109/20.133383 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200082 ER PT J AU MCCALLUM, RW YOO, SI AF MCCALLUM, RW YOO, SI TI PROCESSING AND GRAIN-BOUNDARY EFFECTS IN ND1.XBA2-XCU3O7+D SUPERCONDUCTORS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM AB The Nd1-xBa2-xCu3O7+d system has been shown by a number of investigators to exhibit a solid solution for x = 0 to x = 0.5 for temperatures above the orthorhombic to tetragonal transition of the x = 0 end point. Published measurements of the superconducting properties as a function of x have not yielded a consistent behavior of transition temperature upon composition. While x-ray diffraction and TGA measurements are generally performed on powdered samples, superconductivity measurements are performed on sintered compacts. D.C. Magnetization measurements of sintered compacts have shown that the transition width and superconducting fraction is strongly dependent on the temperature at which the material is sintered. Scanning Auger Microscopy (SAM) of fracture surfaces of sintered samples have shown that even in very high purity samples a thin Nd deficient grain boundary layer exists. Hysteresis measurements show good intergranular critical currents at high fields but the intragranular critical currents are still low. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. RP MCCALLUM, RW (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Yoo, Sang-Im/C-8565-2014 NR 9 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1143 EP 1145 DI 10.1109/20.133384 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200083 ER PT J AU KAMPWIRTH, RT GRACE, JM MILLER, DJ MCDONALD, DB GRAY, KE REITEN, M ASCOLESE, M LATVAKOSKI, H AF KAMPWIRTH, RT GRACE, JM MILLER, DJ MCDONALD, DB GRAY, KE REITEN, M ASCOLESE, M LATVAKOSKI, H TI MECHANISMS CONTROLLING THE INSITU FORMATION AND SUPERCONDUCTING PROPERTIES OF BI-SR-CA-CU-O FILMS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID CRITICAL-FIELD; THIN-FILMS; ANISOTROPY AB We have previously shown3,6 that sputtered films of Bi2Sr2CaCu2O(x) (BSCCO) deposited onto single crystal MgO substrates held at substrate temperatures, T(s), near 700-degrees-C and slowly cooled in oxygen, from High Temperature Superconducting (HTS) films with T(czero) between 50 and 70K. The conditions necessary to achieve superconductivity include having close to stoichiometric composition at the T(s) required to form the superconductor. Both T(czero) and c-axis orientation increase with T(s) while the relative bismuth content decreases. Bismuth film content is affected by the type and amount of oxidant, total system pressure, target-to-substrate spacing, and substrate bias. We suggest oxygen resputtering of the film may play a role similar to that reported for YBa2Cu3O7-x (YBCO). Oxygen partial pressure during and cooldown rate from T(s) to approximately-350-degrees-C also affects the superconducting properties. C1 ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439. RP KAMPWIRTH, RT (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 8 TC 7 Z9 7 U1 1 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1219 EP 1222 DI 10.1109/20.133405 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200102 ER PT J AU SINKO, RJ CAMPBELL, HG ARENDT, P ELLIOT, N AF SINKO, RJ CAMPBELL, HG ARENDT, P ELLIOT, N TI ELECTRON-BEAM (EB) WELDABILITY STUDY OF CONSIL-995 - A STRUCTURAL MATERIAL FOR RF CAVITY APPLICATIONS OF THIN-FILM HIGH-TEMPERATURE SUPERCONDUCTORS (ASC-90) SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM AB The use of HTS thin films for improved RF cavity performance is being investigated by many research institutions. Babcock & Wilcox, as part of a project sponsored by the U.S. Army Strategic Defense Command, is working with leading HTS thin film investigators in evaluating new ceramic superconductors for RF cavity applications. Although this research is ongoing, one of the most promising structural materials for film deposition is a Handy & Harmon silver alloy, Consil 995. Researchers have demonstrated the suitability of this material for HTS thin film deposition both with and without a buffer layer. Babcock & Wilcox has performed an investigation of successful joining parameters for this material by Electron Beam welding. The results have been investigated by metallographic inspection, mechanical testing, XRD and electron microscopy. The changes in material properties due to welding and heat treating are reported and compared to niobium. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544. RP SINKO, RJ (reprint author), BABCOCK & WILCOX CO,NNFD,LYNCHBURG,VA 24505, USA. NR 9 TC 0 Z9 0 U1 1 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1295 EP 1298 DI 10.1109/20.133421 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200119 ER PT J AU KIM, DH GRAY, KE KAMPWIRTH, RT MCDONALD, DB MCKAY, DM AF KIM, DH GRAY, KE KAMPWIRTH, RT MCDONALD, DB MCKAY, DM TI DISSIPATION IN HIGH-TEMPERATURE SUPERCONDUCTORS IN A MAGNETIC-FIELD SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID CRITICAL CURRENTS; TC; STATE AB The absence of a Lorentz force dependence on dissipation in the highly anisotropic high-temperature superconductor, Tl2Ba2CaCu2O(x), has been measured over a wide range of current densities in broadened resistive transitions, current-voltage characteristics, magnetoresistances, and critical current densities, J(c). The magnetoresistances are very useful to find out the correct temperature and field dependences of the activation energy. As an alternative to flux motion, we consider a Josephson-coupling model which is consistent with the broadened resistive transitions and the lack of Lorentz-force dependence. We found that the Josephson-coupling model agrees with the temperature dependences of the activation energy and J(c) and is better matched to the weak field dependence of J(c) than the flux creep model. Possible origins of Josephson junctions in high-quality films and single crystals are discussed. RP KIM, DH (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 13 TC 5 Z9 5 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1383 EP 1386 DI 10.1109/20.133442 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200142 ER PT J AU LICHTENBERGER, KS SANDERS, SC FINNEMORE, DK AF LICHTENBERGER, KS SANDERS, SC FINNEMORE, DK TI FLUX CREEP IN SUPERCONDUCTORS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM AB Measurements of flux creep have been undertaken for a variety of superconductors to determine the factors that control the temperature and magnetic field regimes where the material transforms from a strong pinning rigid flux lattice material to the region where the flux lattice is highly mobile. Analysis of the data in terms of a single effective pinning potential, U(eff), using the Beasley model indicates that all of the superconductors measured have a gradual transition from the strong pinning behavior at low temperature to weak pinning behavior at high temperature. There is a narrow band of fields and temperatures in the H-T plane where U(eff)/kT rises from 2 to 100. The position of this band changes considerably from material to material. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP LICHTENBERGER, KS (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1387 EP 1389 DI 10.1109/20.133443 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200143 ER PT J AU LAUBACHER, DB FACE, DW SMALL, RJ WILKER, C MATTHEWS, AL RAISTRICK, I GARZON, FH BERRY, JG MERCHANT, P AMANO, J TABER, RC AF LAUBACHER, DB FACE, DW SMALL, RJ WILKER, C MATTHEWS, AL RAISTRICK, I GARZON, FH BERRY, JG MERCHANT, P AMANO, J TABER, RC TI PROCESSING AND YIELD OF Y1BA2CU3O7-X THIN-FILMS AND DEVICES PRODUCED WITH A BAF2 PROCESS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID SUPERCONDUCTORS AB High quality films were produced by co-evaporation and co-sputtering of Y, Cu, and BaF2 followed by an ex-situ anneal. The Y1Ba2Cu3O7-x films produced had microwave surface resistances as low as 1/10 that of Cu at 77 K and 10 GHz. This process is especially useful for producing uniform films over areas larger than 1 square inch and is compatible with lift-off or traditional etch patterning processes for fabrication of microwave devices. More than 100 films have been deposited on (100) LaAlO3 with various compositions and anneal conditions. Films were characterized by a wide variety of techniques aimed at optimization of film quality through process control. Emphasis was placed on determining the relationship between material properties and film microwave performance. Run-to-run reproducibility for a sample set of over 20 films was determined. In addition, C-band 5 GHz microstrip resonators were fabricated from these microwave characterized films. Unloaded Q's of these devices have exceeded 7500 at 77 K compared to normal metal resonator Q's of 300 for this structure. These Q's correlate well with predicted performance based upon the previously measured microwave surface resistance of the unpatterned films. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. HEWLETT PACKARD CO,SUPERCONDUCT LAB,PALO ALTO,CA 94303. RP LAUBACHER, DB (reprint author), DUPONT CO,DEPT CENT RES & DEV,POB 80304,WILMINGTON,DE 19880, USA. NR 11 TC 13 Z9 13 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1418 EP 1421 DI 10.1109/20.133978 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200151 ER PT J AU WU, XD MUENCHAUSEN, RE FOLTYN, SR ESTLER, RC NOGAR, NS ROLLETT, AD CHANG, CC ENGLAND, P RAMESH, R HWANG, DM RAVI, TS AF WU, XD MUENCHAUSEN, RE FOLTYN, SR ESTLER, RC NOGAR, NS ROLLETT, AD CHANG, CC ENGLAND, P RAMESH, R HWANG, DM RAVI, TS TI PROPERTIES OF SUPERCONDUCTING YBA2CU3O7-DELTA THIN-FILMS MADE AT HIGH DEPOSITION RATES SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM AB High T(c) and J(c) YBa2Cu3O7-delta thin films were prepared by pulsed laser deposition using deposition rates up to 145 angstrom/s. In this paper, it will be shown that the deposition rate is one of the important thin film processing parameters in addition to the substrate temperature and oxygen partial pressure, which control the film microstructure surface morphology and thereby the superconducting properties. C1 BELLCORE,RED BANK,NJ 07701. RP WU, XD (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. RI Rollett, Anthony/A-4096-2012 OI Rollett, Anthony/0000-0003-4445-2191 NR 13 TC 5 Z9 5 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1445 EP 1448 DI 10.1109/20.133979 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200158 ER PT J AU DELAYEN, JR BOHN, CL ROCHE, CT AF DELAYEN, JR BOHN, CL ROCHE, CT TI MEASUREMENTS OF THE RF SURFACE-RESISTANCE OF HIGH-TC SUPERCONDUCTORS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID TEMPERATURE; FREQUENCY; CRYSTALS; FIELD AB An experimental program is being conducted to assess the applicability of high-T(c) superconductors for use in high power rf and microwave devices. The program involves the measurement of the rf surface resistance of high-T(c) samples at frequencies between 0.15 and 40 GHz and rf surface magnetic fields as high as 640 gauss. Polycrystalline samples were found to have surface resistances which increase monotonically with rf-field amplitude, saturating at high field at a few percent of the normal-state surface resistance just above T(c). RP DELAYEN, JR (reprint author), ARGONNE NATL LAB,DIV ENGN PHYS,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 13 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1532 EP 1535 DI 10.1109/20.133475 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200176 ER PT J AU HOLSTEIN, WL PARISI, LA KOUNTZ, DJ WILKER, C MATTHEWS, AL ARENDT, PN TABER, RC AF HOLSTEIN, WL PARISI, LA KOUNTZ, DJ WILKER, C MATTHEWS, AL ARENDT, PN TABER, RC TI PREPARATION AND CHARACTERIZATION OF TL2BA2CACU2O8 FILMS ON (100) LAALO3 SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID CA-CU-O; SUPERCONDUCTING THIN-FILMS; ZERO RESISTANCE; TL2CABA2CU2OY; 120-K AB A two-step process for the fabrication of 0.12-1.20-mu-m-thick Tl2Ba2CaCu2O8 films on (100) LaAlO3 has been developed. The process involves the deposition of a BaCaCuO precursor film at low temperature by rf magnetron sputtering, followed by annealing in the presence of Tl2O vapor to convert the precursor film into Tl2Ba2CaCu2O8. Over a distance of 4 cm, film composition was Tl:Ba:Ca:Cu = 2.05 +/- 0.09:2.05 +/- 0.06:1.01 +/- 0.03: 1.94 +/- 0.06 and thickness was uniform to within 6%. The films contain only trace quantities of secondary phases and are epitaxially oriented, with the c-axis of Tl2Ba2CaCu2O8 perpendicular to the surface and the two a-axes aligned with the pseudo-cubic a-axes of the underlying LaAlO3 substrate. Films had a T(C) for zero dc resistivity of 106.5 +/- 0.5 K, a transport critical current density for continuous current of 2.9 x 10(6) A-cm-2 at 4.2 K and 2.7 x 10(5) A-cm-2 at 77 K, and a sharp (< 0.3-degrees-C) ac inductance transition with an onset temperature of 105 +/- 2 K. Surface resistance at 20 GHz less than 2 m-OMEGA, about 10X lower than Cu, was routinely achieved for temperatures below 90 K and, for the best films, at temperatures up to 100 K. Surface resistance at about 10 GHz on one film was 0.067 m-OMEGA at 4.2 K, 0.36 m-OMEGA at 77 K, and 0.74 m-OMEGA at 90 K. Films have been reproducibly fabricated on substrates up to 2.54 cm square. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. HEWLETT PACKARD CO,SUPERCONDUCT LAB,PALO ALTO,CA 94303. RP HOLSTEIN, WL (reprint author), DUPONT CO,DEPT CENT RES & DEV,POB 80304,WILMINGTON,DE 19880, USA. NR 28 TC 23 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1568 EP 1572 DI 10.1109/20.133982 PN 2 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200185 ER PT J AU DYE, RC ARENDT, PN MARTIN, JA HUBBARD, KM ELLIOTT, N REEVES, G AF DYE, RC ARENDT, PN MARTIN, JA HUBBARD, KM ELLIOTT, N REEVES, G TI SUPERCONDUCTING PROPERTIES OF TL-BA-CA-CU-O FILMS ON SILVER SUBSTRATES SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM AB Films of Ba-Ca-Cu-O have been rf magnetron sputtered onto Consil 995 substrates. A post deposition anneal in an over pressure of T1 produces the superconducting 1212 and 2212 phases. Varying the annealing procedures changes the electrical properties of the final films dramatically. Dynamic impedance, a novel approach to the electrical characterization of these films on a conductive substrate is discussed and compared with SEM, XRD and RBS measurements as a function of differing annealing protocols. RP DYE, RC (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 3 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1573 EP 1576 DI 10.1109/20.133484 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200186 ER PT J AU BEALL, JA CROMAR, MW HARVEY, TE JOHANSSON, ME ONO, RH REINTSEMA, CD RUDMAN, DA ASHER, SE NELSON, AJ SWARTZLANDER, AB AF BEALL, JA CROMAR, MW HARVEY, TE JOHANSSON, ME ONO, RH REINTSEMA, CD RUDMAN, DA ASHER, SE NELSON, AJ SWARTZLANDER, AB TI YBA2CU3O7-DELTA INSULATOR MULTILAYERS FOR CROSSOVER FABRICATION SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM AB The development of thin-film dielectrics compatible with the epitaxial growth of YBa2Cu3O7-delta (YBCO) is crucial to the fabrication of multilayer device and circuit structures. We have investigated the YBCO/SrTiO3(STO) system by fabricating YBCO/STO bilayers and simple YBCO/STO/YBCO crossover structures. The thin films were deposited in situ by pulsed laser deposition and analyzed using x-ray diffraction and scanning electron microscopy. The film interfaces were characterized by secondary ion mass spectrometry (SIMS) depth profiling. We have developed photolithographic and wet-etching processes for patterning the crossovers which are compatible with these materials. The crossover structures were characterized by resistance and insulator pinhole density as well as the superconducting properties of the patterned top and bottom YBCO electrodes (critical temperature, T(c) and critical current density, J(c)). Using SrTiO3 as the insulating layer, we have made crossovers with good isolation between layers( > 100 M OMEGA) and high J(c) even in the top electrode (J(c)(76 K) > 10(5) A/cm2). C1 SOLAR ENERGY RES INST,GOLDEN,CO 80401. RP BEALL, JA (reprint author), NIST,CRYOELECTR METROL GRP,DIV ELECTROMAGNET TECHNOL,MS 72403,325 BROADWAY,BOULDER,CO 80303, USA. NR 6 TC 11 Z9 11 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1596 EP 1599 DI 10.1109/20.133491 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200192 ER PT J AU ROSHKO, A ONO, RH BEALL, JA MORELAND, J NELSON, AJ ASHER, SE AF ROSHKO, A ONO, RH BEALL, JA MORELAND, J NELSON, AJ ASHER, SE TI MORPHOLOGY OF SILVER ON YBA2CU3O7-DELTA THIN-FILMS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM AB The morphology of silver layers deposited and annealed on laser ablated YBa2Cu3O7-delta films has been examined. Silver was found to dewet the YBa2Cu3O7-delta (001) surface on annealing in oxygen and nitrogen. This dewetting behavior may be kineticly inhibited by using either thick silver layers or short anneals and low temperatures. Silver layers 70 nm to 2.5 mu-m thick were studied on films deposited on SrTiO3, LaA10(3) and MgO substrates. Anneal times were varied from 6.5 min to 15 hrs at temperatures from 200 to 700-degrees-C. C1 SOLAR ENERGY RES INST,GOLDEN,CO 80401. RP ROSHKO, A (reprint author), NIST,325 BROADWAY,BOULDER,CO 80303, USA. NR 7 TC 8 Z9 9 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1616 EP 1618 DI 10.1109/20.133984 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200197 ER PT J AU SUMMERS, LT DUENAS, AR KARLSEN, CE OZERYANSKY, GM GREGORY, E AF SUMMERS, LT DUENAS, AR KARLSEN, CE OZERYANSKY, GM GREGORY, E TI A CHARACTERIZATION OF INTERNAL-SN NB3SN SUPERCONDUCTORS FOR USE IN THE PROOF OF PRINCIPLES (POP) COIL SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB High-performance, Ti-alloyed, internal-Sn superconductors have been selected for use in the Proof of Principles (PoP) coil, a 1.0-m o.d., 0.4-m i.d. solenoid designed to produce fields up to 15 T. The PoP coil, which will use forced-flow Cable-In-Conduit Conductors (CICC), will operate at 4.2 K and moderate levels of conductor strain. Here we report the results of detailed characterizations of two proposed PoP coil Nb3Sn 19 subelement superconducting wires of differing topology. We have investigated the critical current as a function of applied field and applied strain. The wires were found to have excellent high-field properties, providing a high performance margin for the proposed PoP coil. The field and strain dependence of J(c) have been found to compare favorably with predictions from a wire performance model recently developed for Nb3Sn superconductors. C1 INTERMAGNET GEN CORP,WATERBURY,CT 06704. RP SUMMERS, LT (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 5511,L-643,LIVERMORE,CA 94550, USA. NR 5 TC 8 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1763 EP 1766 DI 10.1109/20.133986 PN 3 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300021 ER PT J AU MARKEN, KR MARKWORTH, AJ SUMPTION, MD COLLINGS, EW SCANLAN, RM AF MARKEN, KR MARKWORTH, AJ SUMPTION, MD COLLINGS, EW SCANLAN, RM TI EDDY-CURRENT EFFECTS IN TWISTED AND WOUND SSC STRANDS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO ID COUPLING LOSSES; SUPERCONDUCTORS; CABLES AB Although the effect of strand twist upon eddy-current losses in multifilamentary superconducting composites is well understood, the combined effects of twist and subsequent winding are not as well documented. An analysis has been made of the effective pitch (with respect to an applied field transverse to the winding axis) of a pair of filaments that have been first twisted and then helically wound. In the case of very different values of twist pitch and winding pitch, the effective pitch is simply the smaller of these. However, as the value of winding pitch approaches that of the twist pitch, the effective pitch may become quite large. Results of this analysis are compared with magnetization measurements of a series of helically wound strands with varied twist pitch. These measurements show large eddy-current losses in a twisted strand with twist pitch comparable to winding pitch; more generally it is shown that eddy-current loss depends upon the superposition of twist and winding. The general shape of the magnetization as a function of applied field M(H) loop due to the combined effects of filamentary hysteresis and eddy-currents has been mathematically modeled. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP MARKEN, KR (reprint author), BATTELLE MEM INST,505 KING AVE,COLUMBUS,OH 43201, USA. RI Sumption, Mike/N-5913-2016 OI Sumption, Mike/0000-0002-4243-8380 NR 9 TC 18 Z9 18 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1791 EP 1795 DI 10.1109/20.133539 PN 3 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300028 ER PT J AU ROYET, JM SCANLAN, RM AF ROYET, JM SCANLAN, RM TI DEVELOPMENT OF SCALING RULES FOR RUTHERFORD TYPE SUPERCONDUCTING CABLES SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB During the R&D phase of the Superconducting Supercollider (SSC) program, LBL was responsible for establishing the parameters for cables used in SSC dipole and quadrupole magnets. In addition, LBL has collaborated with Fermi National Accelerator Laboratory on the design and fabrication of a new cable for use in the Low Beta Quadrupoles. As a result of the development work on these and other cables, we have arrived a set of scaling rules which provide guidelines for choosing the parameters for a wide range of superconducting cables. These parameters include strand size, strand number, keystone angle, percent compaction, cable pitch and compacted cable dimensions. In addition, we have defined the tolerance ranges for the key cable manufacturing parameters such as mandrel size and shape, strand tension, and Turkshead temperature control. In this paper, we present the results on cables ranging from 8 strands to 36 strands of 0.65mm wire and from 8 strands to 30 strands of 0.8mm wire. We use these results to demonstrate the application of the scaling rules for Rutherford-type cable. RP ROYET, JM (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 7 TC 6 Z9 6 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1807 EP 1808 DI 10.1109/20.133543 PN 3 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300032 ER PT J AU LAMM, MJ COULTER, K GOURLAY, S JAFFERY, TS AF LAMM, MJ COULTER, K GOURLAY, S JAFFERY, TS TI MEASUREMENT OF TIME-DEPENDENT FIELDS IN HIGH-GRADIENT SUPERCONDUCTING QUADRUPOLES FOR THE TEVATRON SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO ID MAGNETS AB Magnetic field measurements have been performed on prototype and production magnets from two high gradient superconducting quadrupoles designs. One design is a double shell quadrupole with 36 strand Rutherford cable. The other design is a single shell quadrupole with 5 individually insulated monolithic strands connected in series. These magnets have similar bore diameters and cable dimensions. However, there are significant differences between the two designs, as well as differences between prototype and production magnets within each design, with regard to Cu to superconductor ratio, filament diameter and filament spacing to strand diameter. The time dependence at fixed currents of the measured magnetic fields is discussed. RP LAMM, MJ (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1811 EP 1814 DI 10.1109/20.133545 PN 3 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300034 ER PT J AU GOURLAY, SA GARBER, M ROYET, J SCANLAN, RM AF GOURLAY, SA GARBER, M ROYET, J SCANLAN, RM TI DEGRADATION STUDIES OF FERMILAB LOW BETA QUADRUPOLE CABLE SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO ID SUPERCONDUCTORS; COMPOSITES; INSERTION; TEVATRON; TI AB The production of high gradient superconducting quadrupoles for the Tevatron D0/B0 Low Beta insertion is currently underway at Fermilab. The two-shell design utilizes a 36-strand Rutherford style cable produced by Lawrence Berkeley Laboratory. A measure of cable quality is usually given by a comparison of the critical current of the cable with the sum of the critical currents of the strand. A recent study involving variations in the cabling conditions and dimensional parameters has resulted in a significant decreases in degradation. Over the period of cable production degradation has been reduced from an average of 12% to less than 4%. Some cable samples measured by Brookhaven National Laboratory exhibit Jc's in excess of 3100 A/mm2 @ 5T. The adjustments to the cabling procedure which are believed to be responsible for the reduction in Jc degradation will be discussed. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP GOURLAY, SA (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 14 TC 2 Z9 2 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1815 EP 1817 DI 10.1109/20.133546 PN 3 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300035 ER PT J AU SLACK, DS PATRICK, RE MILLER, JR AF SLACK, DS PATRICK, RE MILLER, JR TI FENIX, A TEST FACILITY FOR ITER AND OTHER NEW SUPERCONDUCTING MAGNETS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB The Fusion ENgineering International eXperimental (FENIX) Test Facility which is nearing completion at Lawrence Livermore National Laboratory, is a 76-t set of superconducting magnets housed in a 4-m-diameter cryostat. It represents a significant step toward meeting the testing needs for the development of superconductors appropriate for large-scale magnet applications such as the International Thermonuclear Experimental Reactor (ITER). The magnet set is configured to allow radial access to the 0.4-m-diameter high-field region where maximum fields up to 14 T will be provided. The facility is fitted with a thermally isolated test well with a port to the high-field region that allows insertion and removal of test conductors without disturbing the cryogenic environment of the magnets. It is expected that the facility will be made available to magnet developers internationally, and this paper discusses its general design features, its construction, and its capabilities. RP SLACK, DS (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,POB 5511,L-643,BERKELEY,CA 94720, USA. NR 4 TC 6 Z9 6 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1835 EP 1838 DI 10.1109/20.133552 PN 3 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300041 ER PT J AU KUCHNIR, M OZELIS, JP AF KUCHNIR, M OZELIS, JP TI SUPERCONDUCTING CURRENT TRANSDUCER SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB The construction and performance of an electric current meter that operates in liquid He and mechanically splits apart to permit replacement of the current carrying conductor is described. It permits the measurement of currents induced in a loop of superconducting cable and expeditious exchange of such loops. It is a key component for a short sample cable testing facility that requires no high current power supplies nor high current leads. Its superconducting pickup circuit involves a non-magnetic core toroidal split-coil that surrounds the conductor and a solenoid whose field is sensed by a Hall probe. This toroidal split-coil is potted inside another compensating toroidal split-coil. The C shaped half toroids can be separated and brought precisely together from outside the cryostat. The Hall probe is energized and sensed by a lock-in amplifier whose output drives a bipolar power supply which feeds the compensating coil. The output is the voltage across a resistor in this feedback circuit. Currents of up to 10 KA can be measured with a precision of 150 mA surrounding the current carrying conductor. The inner toroidal coil is superconducting and it is the pickup part of a superconducting flux transformer whose other part, a short solenoid surrounds a Hall probe. This flux transformer is shown in Fig. 1. The short solenoid (field coil) is enclosed in a superconducting cavity for magnetic background noise shielding. The magnetic field due to the current in the sample is prevented from penetrating into the superconducting circuit of the flux transformer by a Lenz law current in this circuit. This Lenz law current produces the magnetic field detected by the Hall probe. The relationship between this magnetic field and the current in the sample depends on the geometry of the pickup, sample, and their relative position. The reproducibility of this geometry is one of the subjects of the tests described below. RP KUCHNIR, M (reprint author), FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 3 TC 0 Z9 0 U1 1 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1843 EP 1845 DI 10.1109/20.133554 PN 3 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300043 ER PT J AU WU, JL DEDERER, JT HULL, JR POEPPEL, RB YOUNGDAHL, CA ECKELS, PW SINGH, SK SINGH, JP LANAGAN, MT BALACHANDRAN, U AF WU, JL DEDERER, JT HULL, JR POEPPEL, RB YOUNGDAHL, CA ECKELS, PW SINGH, SK SINGH, JP LANAGAN, MT BALACHANDRAN, U TI DESIGN AND TESTING OF A HIGH-TEMPERATURE SUPERCONDUCTING CURRENT LEAD SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO ID HIGH-TC SUPERCONDUCTOR AB The high critical temperature and low thermal conductivity of the ceramic superconductor Y-Ba-Cu-O were utilized to reduce the Joule heating and the heat leak in a vapor-cooled current lead design of nominally 1-kA capacity. The lead consists of a lower superconducting part and an upper normal metal (copper) part. The superconducting part is an assembly of twenty rectangular bars fabricated from a composite of Y-Ba-Cu-O and Ag (15% vol.) This part is designed to operate below the critical temperature of the ceramic superconductor. The copper part, consisting of twenty copper wires, extends outside of the cryostat and interfaces to the room temperature power supply. The lead was successfully tested in a liquid helium cryostat for currents up to 2 kA. At the optimum operating currents of 1.7 - 1.8 kA, the helium boil-off measurements show a heat leak reduction of approximately 40% from the conventional designs. Details of the design, fabrication issues, and the testing are presented. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP WU, JL (reprint author), WESTINGHOUSE ELECT CORP,CTR SCI & TECHNOL,1310 BEULAH RD,PITTSBURGH,PA 15235, USA. NR 9 TC 34 Z9 34 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1861 EP 1865 DI 10.1109/20.133559 PN 3 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300048 ER PT J AU CHRISTOPHERSON, D CAPONE, D HANNAFORD, R REMSBOTTOM, R DELASHMIT, R JAYAKUMAR, RJ SNITCHLER, G SCANLAN, R ROYET, J AF CHRISTOPHERSON, D CAPONE, D HANNAFORD, R REMSBOTTOM, R DELASHMIT, R JAYAKUMAR, RJ SNITCHLER, G SCANLAN, R ROYET, J TI SSC 40 MM CABLE RESULTS AND 50 MM DESIGN DISCUSSIONS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB A summary of the cable produced for the 1990 40 mm Dipole Program is presented. The cable design parameters for the 50 mm Dipole Program are discussed, as well as portions of the SSC specification draft. Considerations leading to the final cable configuration and the results of preliminary trials are included. The first iteration of a strand mapping program to automate cable strand maps is introduced. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP CHRISTOPHERSON, D (reprint author), SUPERCONDUCTING SUPER COLLIDER LAB,2550 BECKLEYMEADE AVE,DALLAS,TX 75237, USA. NR 7 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1881 EP 1883 DI 10.1109/20.133565 PN 3 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300053 ER PT J AU NICOL, TH TSAVALAS, YP AF NICOL, TH TSAVALAS, YP TI CRYOSTAT DESIGN FOR THE SUPERCONDUCTING SUPER COLLIDER 50MM APERTURE DIPOLE MAGNET SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB The cryostat of an SSC dipole magnet consists of all magnet components except the cold mass assembly. It serves to support the cold mass accurately and reliably within the vacuum vessel, provide all required cryogenic piping, and to insulate the cold mass from heat radiated and conducted from the environment. It must function reliably during storage, shipping and handling, normal magnet operation, quenches, and seismic excitations and must be manufacturable at low cost. The major components of the cryostat are the vacuum vessel, thermal shields, multilayer insulation (MLI) system, cryogenic piping, interconnections, and suspension system. The overall design of a cryostat for superconducting accelerator magnets requires consideration of fluid flow, proper selection of materials for their thermal and structural performance at both ambient and operating temperature, and knowledge of the environment to which the magnets will be subjected over the course their 25 year expected life. This paper describes the design of the current SSC collider dipole magnet cryostat and includes discussions on the thermal, structural, and dynamic considerations involved in the development of each of the major systems. C1 GE,MED SYST,FLORENCE,SC 29501. RP NICOL, TH (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1884 EP 1887 DI 10.1109/20.133566 PN 3 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300054 ER PT J AU TAYLOR, CE BARALE, P CASPI, S DELLORCO, D FRITZ, D GILBERT, WS LIETZKE, A PETERS, C WANDESFORDE, A AF TAYLOR, CE BARALE, P CASPI, S DELLORCO, D FRITZ, D GILBERT, WS LIETZKE, A PETERS, C WANDESFORDE, A TI A 40 MM BORE QUADRUPOLE MAGNET FOR THE SSC SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB A 40 mm bore quadrupole magnet design, called "QC", has been made for the SSC with the following parameters: 208 T/m gradient at 6500A, 2-layer "cos 2-theta" winding arrangement with 30 strand cable and one spacer wedge per coil. Structural support is provided by self-supporting interlocking collars; two types of symmetrical laminations are pre-assembled into collar packs for ease of assembly. This paper will describe the design of a prototype quadrupole magnet for the SSC and preliminary test results on 1 m models. RP TAYLOR, CE (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 7 TC 1 Z9 1 U1 1 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1888 EP 1891 DI 10.1109/20.133567 PN 3 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300055 ER PT J AU BOTTURA, L MINERVINI, JV AF BOTTURA, L MINERVINI, JV TI MODELING OF DUAL STABILITY IN A CABLE-IN-CONDUIT CONDUCTOR SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO ID SUPERCONDUCTORS AB A zero dimensional stability model has been developed for cable-in-conduit superconductors. The model is effective in simulating the multi-valued stability behaviour in the vicinity of the limiting current. This has been achieved by modifying the helium heat transfer coefficient to account for inertial and frictional terms which affect the induced helium flow. The model can reproduce with remarkable accuracy the multi-valued stability behaviour shown in earlier measurements performed by Lue, et al.1. A first order approximation of the effect of the steady state mass flow is introduced in the model showing how an increase of m(ss) tends to "wash-away" the multiple stability region as observed in the experiment. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP BOTTURA, L (reprint author), NET TEAM,BOLTZMANNST 2,W-8046 GARCHING,GERMANY. NR 11 TC 13 Z9 13 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1900 EP 1903 DI 10.1109/20.133571 PN 3 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300058 ER PT J AU DELAYEN, JR BOHN, CL ROCHE, CT AF DELAYEN, JR BOHN, CL ROCHE, CT TI NIOBIUM RESONATOR DEVELOPMENT FOR HIGH-BRIGHTNESS ION-BEAM ACCELERATION SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB Two niobium resonant cavities for high-brightness ion beam acceleration have been constructed and tested. The first was based on a coaxial quarter-wave geometry and was optimized for phase velocity B0(o) = 0.15. This cavity, which resonates at 400 MHz in the fundamental mode, operated at an average (wall-to-wall) accelerating gradient of 12.9 MV/m under continuous-wave (cw) fields. At this gradient, a cavity Q of 1.4x10(8) was measured. The second was based on a coaxial half-wave geometry and was optimized for B(o) = 0.12. This cavity, which resonates at 355 MHz in the fundamental mode, operated at an average accelerating gradient of 18.0 MV/m under cw fields. This is the highest average accelerating gradient achieved to date in low-velocity structures designed for cw operation. At this gradient, a cavity Q of 1.2x10(8) was measured. RP DELAYEN, JR (reprint author), ARGONNE NATL LAB,DIV ENGN PHYS,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 13 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1924 EP 1927 DI 10.1109/20.133578 PN 3 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300064 ER PT J AU DELAYEN, JR SHEPARD, KW AF DELAYEN, JR SHEPARD, KW TI HIGH ELECTRIC-FIELDS IN A SUPERCONDUCTING RFQ STRUCTURE SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB High surface electric fields have been obtained in the first tests of a superconducting rf quadrupole device. The rf quadrupole fields were generated between niobium vanes 6.5 cm in length, with an edge radius of 2 mm, and with a beam aperture of 6 mm diameter. In test at 4.2 K, the 64 MHz device operated cw at peak surface electric fields of 128 MV/m. Virtually no electron loading was observed at fields below 100 MV/m. It was possible to operate at surface fields of 210 MV/m in pulses of 1 msec duration using a 2.5 kW rf source. For the vane geometry tested, more than 10 square centimeters of surface support a field greater than 90% of the peak field. The present result indicates that electric fields greater than 100 MV/m can be obtained over an appreciable area, sufficient for some accelerator applications. It also shows that superconducting rf technology may provide an extended range of options for rf quadrupole design. C1 ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. RP DELAYEN, JR (reprint author), ARGONNE NATL LAB,DIV ENGN PHYS,ARGONNE,IL 60439, USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1928 EP 1931 DI 10.1109/20.133579 PN 3 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300065 ER PT J AU GILBERT, WS ALTHAUS, RF BARALE, PJ BENJEGERDES, RW GREEN, MA GREEN, MI SCANLAN, RM AF GILBERT, WS ALTHAUS, RF BARALE, PJ BENJEGERDES, RW GREEN, MA GREEN, MI SCANLAN, RM TI NEW MEASUREMENTS OF MAGNETIC-FIELD DECAY IN 1 METER SSC-TYPE DIPOLES SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO RP GILBERT, WS (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1965 EP 1968 DI 10.1109/20.133589 PN 3 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300075 ER PT J AU COOK, JM AF COOK, JM TI STRAIN-ENERGY MINIMIZATION IN SSC MAGNET WINDING SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB Differential geometry provides a natural family of coordinate systems, the Frenet frame, in which to specify the geometric properties of a magnet winding. By a modification of the Euler-Bernoulli thin rod model, the strain energy is defined with respect to this frame. Then it is minimized by a direct method from the calculus of variations. The mathematics, its implementation in a computer program, and some analysis of an SSC dipole by the program will be described. RP COOK, JM (reprint author), ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439, USA. NR 16 TC 16 Z9 16 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1976 EP 1980 DI 10.1109/20.133592 PN 3 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300078 ER PT J AU MORGAN, GH GREENE, A JOCHEN, G MORGILLO, A AF MORGAN, GH GREENE, A JOCHEN, G MORGILLO, A TI WINDING MANDREL DESIGN FOR THE WIDE CABLE SSC DIPOLE SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB The 50 mm coil i.d. SSC dipole magnets use wider cables to give a greater operational margin between quench field and operating field. The cable used for the inner coil has 30 strands of the same size (0.808 mm) instead of 23 and the outer has 36 strands of the same size (0.648 mm) instead of 30 and the cable widths are increased in proportion. Although the coil inner diameter has been increased from 40 mm, the coil ends are noticeably harder to wind. This report describes the computational and experimental effort to design winding mandrels or center posts for the constant-perimeter ends. RP MORGAN, GH (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 1 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1981 EP 1984 DI 10.1109/20.133593 PN 3 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300079 ER PT J AU BROWN, BC AF BROWN, BC TI ACCELERATOR MAGNET DESIGNS USING SUPERCONDUCTING MAGNETIC-SHIELDS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO ID FIELDS AB Superconducting dipoles and quadrupoles for existing accelerators have a coil surrounded by an iron shield. The shield limits the fringe field of the magnet while having minimal effect on the field shape and providing a small enhancement of the field strength. Shields using superconducting materials can be thinner and lighter and will not experience the potential of a large de-centering force. Boundary conditions for these materials, material properties, mechanical force considerations, cryostat considerations and some possible geometrical configurations for superconducting shields will be described. RP BROWN, BC (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1985 EP 1988 DI 10.1109/20.133594 PN 3 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300080 ER PT J AU GREEN, MA ALTHAUS, RF BARALE, PJ BENJEGERDES, RW GILBERT, WS GREEN, MI SCANLAN, RM TAYLOR, CE AF GREEN, MA ALTHAUS, RF BARALE, PJ BENJEGERDES, RW GILBERT, WS GREEN, MI SCANLAN, RM TAYLOR, CE TI MEASUREMENTS OF PASSIVE CORRECTION OF MAGNETIZATION HIGHER MULTIPOLES IN ONE METER LONG DIPOLES SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO ID MAGNETS; FIELDS AB The use of passive superconductor to correct the magnetization sextupole and decapole in SSC dipoles appears to be promising. This paper presents the results of a series of experiments of passive superconductor correctors in one meter long dipole magnets. Reduction of the magnetization sextupole by a factor of five to ten has been achieved using the passive superconductor correctors. The magnetization decapole was also reduced. The passive superconductor correctors reduced the sextupole temperature sensitivity by an order of magnitude. Flux creep decay was partially compensated for by the correctors. RP GREEN, MA (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 13 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1989 EP 1992 DI 10.1109/20.133595 PN 3 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300081 ER PT J AU MCCLUSKY, R ROBINS, KE SAMPSON, WB AF MCCLUSKY, R ROBINS, KE SAMPSON, WB TI A NB3SN HIGH-FIELD DIPOLE SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB A dipole magnet approximately 1 meter long with an 8 cm bore has been fabricated from cable made from Nb3Sn multifilamentary strands. The coil consists of four layers of conductor wound in pairs to eliminate internal joints. Each set of layers is separately constrained with Kevlar-epoxy bands and the complete assembly clamped in a split laminated iron yoke. The inner coil pairs were wound before heat treating while the outer coils were formed from pre-reacted cable using conventional insulation. A NbTi version of the magnet was fabricated using SSC conductor to test the construction techniques. This magnet reached a maximum central field of 7.6 Tesla, at 4.4K which is very close to the limit estimated from conductor measurements. The Nb3Sn magnet, however, only reached a maximum field at 8.1T considerably short of the field expected from measurements on the inner cable. RP MCCLUSKY, R (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 6 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1993 EP 1995 DI 10.1109/20.133596 PN 3 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300082 ER PT J AU JAYAKUMAR, J LEUNG, K NOBREGA, F ORRELL, D SANGER, P SNITCHLER, G SPIGO, G TURNER, J GOODZEIT, C GUPTA, R KAHN, S MORGAN, G WILLEN, E KERBY, J STRAIT, J SCHERMER, R AF JAYAKUMAR, J LEUNG, K NOBREGA, F ORRELL, D SANGER, P SNITCHLER, G SPIGO, G TURNER, J GOODZEIT, C GUPTA, R KAHN, S MORGAN, G WILLEN, E KERBY, J STRAIT, J SCHERMER, R TI MECHANICAL AND ELECTROMAGNETIC ANALYSIS OF 50 MILLIMETER DESIGNS FOR THE SSC DIPOLE SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB Several designs for the Superconducting Super Collider dipole magnet have been analyzed. This note discusses the mechanical and electromagnetic features of each design. Electromagnetic and Mechanical analyses were performed using hand, computer programs and finite element techniques to evaluate the design. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP JAYAKUMAR, J (reprint author), SSC LAB,2550 BECKLEYMEADE AVE,DALLAS,TX 75237, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 2016 EP 2019 DI 10.1109/20.133602 PN 3 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300088 ER PT J AU GREGORY, E MOTOWIDLO, LR OZERYANSKY, GM SUMMERS, LT AF GREGORY, E MOTOWIDLO, LR OZERYANSKY, GM SUMMERS, LT TI HIGH-STRENGTH NB3SN CONDUCTORS FOR HIGH MAGNETIC-FIELD APPLICATIONS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB Developments in recent years of Nb3Sn superconducting materials have allowed magnet designers to consider magnets for fields up to 20T. As the magnetic field or the operating current increases, so do the electromagnetic stresses experienced by the superconducting wire in the magnet windings. At strains exceeding the elastic tolerance of Nb3Sn, irreversible damage and current density (J(c)) degradation, will follow. A relatively high conductivity copper based material which retains its high strength after reaction heat treatment, has been used to replace some of the copper stabilizer, both on the outside of the conductor and between the filaments. Some of the effects of this change on the mechanical and electrical properties of composites are reported. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP GREGORY, E (reprint author), INTERMAGNET GEN CORP ADV SUPERCONDUCTING INC,1875 THOMASTON AVE,WATERBURY,CT 06704, USA. NR 2 TC 8 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 2033 EP 2036 DI 10.1109/20.133606 PN 3 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300092 ER PT J AU SUMMERS, LT GUINAN, MW MILLER, JR HAHN, PA AF SUMMERS, LT GUINAN, MW MILLER, JR HAHN, PA TI A MODEL FOR THE PREDICTION OF NB3SN CRITICAL CURRENT AS A FUNCTION OF FIELD, TEMPERATURE, STRAIN, AND RADIATION-DAMAGE SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO ID CRITICAL-CURRENT DENSITIES; NB3GE; WIRES AB Conductors designed for fusion machines must operate at high fields, under large mechanical loads, and in a high neutron flux. Present designs favor the use of Nb3Sn with force-cooling by supercritical-helium to extract large nuclear and ac loss heat loads. Consequently, the magnet designer must have a good knowledge of the critical current of the superconductor as a function of field, strain, temperature, and radiation damage. Expanding on work by Hampshire, et al. and Ekin, combined with radiation-damage studies of Nb3Sn, we express the critical field (B(c)20) as function of temperature, strain and damage energy (E(d)). Similarly, the zero-field critical temperature (T(c)0) is expressed as a function of strain damage energy. The expressions for B(c20) and T(c0) are combined into a functional form that allows an accurate and consistent estimate of the critical current density at the operating conditions of fusion magnet conductors. RP SUMMERS, LT (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 5511,L-643,LIVERMORE,CA 94550, USA. NR 10 TC 212 Z9 215 U1 4 U2 14 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 2041 EP 2044 DI 10.1109/20.133608 PN 3 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300094 ER PT J AU LUE, JW SCHWENTERLY, SW DRESNER, L LUBELL, MS AF LUE, JW SCHWENTERLY, SW DRESNER, L LUBELL, MS TI QUENCH PROPAGATION IN A CABLE-IN-CONDUIT FORCE-COOLED SUPERCONDUCTOR - PRELIMINARY-RESULTS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB Cable-in-conduit force-cooled superconductor is being considered for use in a superconducting magnetic energy storage (SMES) system. The quench behavior of such a conductor plays a very important role in the protection of this system and of other magnets having similar cooling environments. In particular, the existence of the thermohydraulic quenchback effect predicted recently by numerical analysis and theoretical calculation has been investigated experimentally. The test sample consists of a 50-m-long single triplex NbTi superconductor enclosed in a stainless steel conduit. Heaters 0.2 to 8 m long are provided both at the center and at one end of the sample, and the heated end can be closed off to simulate quenching centered in a 100-m-long conductor. The quench behavior of the conductor (e.g., the propagation velocity and the temperature profile) was measured as a function of initial normal zone length, conductor current density, helium temperature, etc. This paper reports the test results and the comparison with the predictions. RP LUE, JW (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 7 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 2072 EP 2075 DI 10.1109/20.133618 PN 3 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300102 ER EF