FN Thomson Reuters Web of Science™ VR 1.0 PT J AU WONG, KM JOKELA, TA EAGLE, RJ BRUNK, JL NOSHKIN, VE AF WONG, KM JOKELA, TA EAGLE, RJ BRUNK, JL NOSHKIN, VE TI RADIONUCLIDE CONCENTRATIONS, FLUXES, AND RESIDENCE TIMES AT SANTA-MONICA AND SAN PEDRO BASINS SO PROGRESS IN OCEANOGRAPHY LA English DT Review ID DEEP SARGASSO SEA; SEDIMENT TRAP; PACIFIC-OCEAN; PLUTONIUM; MARINE; FALLOUT; SAMPLES; CALIFORNIA; CS-137; PB-210 AB Our participation in the California Basin Study (CaBS) in 1986-1988 has produced a radionuclide database that allows us to trace the particle and water movement in the Santa Monica and the San Pedro Basins. These data enable us to calculate the radionuclide inventories in the three compartments of the basin, the water column, the settling particles, and the sediments. We have also determined the fluxes of several radionuclides associated with the sinking particles, the residence time in the water column, and the rate of deposition in the sediments. The biogeochemical environment of the Santa Monica Basin is uniquely suited to the application of tracer techniques to study the sedimentation processes. Subtle, but measurable changes in the distribution of fallout of Cs-137 from 1977 to 1988 were noted in the water column. Compared to the decay corrected measurement in 1973-1977 at the GEOSECS and Farallon Islands stations off the coast of California, Cs-137 inventory in the water column in Santa Monica Basin has not changed significantly for the past decade. Increases in the deep water concentration profiles of Cs-137 partially resulted from particle transport and diagenetic release of cesium in the deep water. The major Cs-137 inventory (>70%) resides in the upper 400m of water, with a mean residence time of 480 +/- 90 years. Less than 11% of the total Cs-137 inventory was found in the sediments at water depths of 900m in 1987. Unlike Cs-137, more than 80% of the fallout Pu-239+240 has been deposited in the Santa Monica Basin sediments. A mean residence time of 13 +/- 2 years was measured for Pu-239+240 in the basin water. The ubiquitous Pu-239-240 subsurface concentration maximum observed in the Pacific oceanic waters at about 350m depth is also evident in the basin water. We have no definitive explanation for the persistence of the subsurface maximum except that it appears to be correlated with the density gradient at 26.5 to 26.9 sigma-t. The Pu-239+240 flux for settling particles correlates remarkably well with mass flux, and it increases with depth in the water column. Plutonium deposition in anoxic sediments also appears to be useful as a time marker for age-dating of sediments and estimating the sediment-accumulation rates. The sedimentation rates determined by plutonium are shown to be comparable to those estimated by excess Pb-210 in the cores. Radionuclide fluxes measured from sediment trap particles in 1986-1988 were lower by a factor of 0.6 +/- 0.2, compared to the average fluxes determined from the box core samples. Radionuclides, such as Pb-210, Cs-137, and Pu-239+240 have been shown to be useful tools in the study of biogeochemical processes in the Santa Monica Basin. RP WONG, KM (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV ENVIRONM SCI,LIVERMORE,CA 94550, USA. NR 50 TC 25 Z9 25 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0079-6611 J9 PROG OCEANOGR JI Prog. Oceanogr. PY 1992 VL 30 IS 1-4 BP 353 EP 391 DI 10.1016/0079-6611(92)90019-V PG 39 WC Oceanography SC Oceanography GA JY671 UT WOS:A1992JY67100012 ER PT J AU COESTER, F AF COESTER, F TI NULL-PLANE DYNAMICS OF PARTICLES AND FIELDS SO PROGRESS IN PARTICLE AND NUCLEAR PHYSICS LA English DT Article DE NULL PLANE; LIGHT FRONT; LIGHT CONE; FOCK SPACE; DIRECT INTERACTIONS; HAMILTONIAN DYNAMICS; CONSTRAINT DYNAMICS ID INFINITE-MOMENTUM FRAME; LIGHT-FRONT DYNAMICS; RELATIVISTIC QUANTUM-MECHANICS; DIRECTLY INTERACTING PARTICLES; DEUTERON MAGNETIC-MOMENT; ONE TIME DIMENSION; FORM-FACTORS; CONE QUANTIZATION; DIRAC FIELDS; QUARK-MODEL AB The focus of this review of null-plane dynamics is the fundamental principle of quantum theory that states must form a linear manifold with a positive scalar product. The intent is to provide an integrated overview of diverse aspects of null-plane dynamics of particles and fields. Hamiltonian particle dynamics is based on the construction of nontrivial representations of the Poincare group on finite tensor products of single-particle spaces, and on finite direct sums of such tensor products. The structure of the space of states and the representations of a kinematic subgroup are independent of the dynamics. The dynamics is specified by Hamiltonian operators which are the Poincare generators outside the kinematic subgroup. Fock-spaces are infinite direct sums of tensor products of single particle spaces. Fock-space representations of Lagrangean field theories can be formulated as limits of Hamiltonian many-body dynamics. The required cutoff can preserve the symmetry of the kinematic subgroup but destroys the full Poincare invariance. The nontrivial questions involve the existence of limits as the cutoff is removed. Covariant wave functions arise either as solutions of covariant wave equations, or as matrix elements of products of covariant field operators. The linear manifold of states is a manifold of equivalence classes of covariant functions. The dynamics appear in the nontrivial inner product and all Poincare transformations are kinematic. Null-plane restrictions of the covariant functions may provide a unitary map of the covariant constraint dynamics into null-plane Hamiltonian dynamics. RP COESTER, F (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 118 TC 86 Z9 88 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0146-6410 J9 PROG PART NUCL PHYS JI Prog. Part. Nucl. Phys. PY 1992 VL 29 BP 1 EP 32 DI 10.1016/0146-6410(92)90002-J PG 32 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA JE715 UT WOS:A1992JE71500001 ER PT J AU DOVER, CB GUTSCHE, T MARUYAMA, M FAESSLER, A AF DOVER, CB GUTSCHE, T MARUYAMA, M FAESSLER, A TI THE PHYSICS OF NUCLEON ANTINUCLEON ANNIHILATION SO PROGRESS IN PARTICLE AND NUCLEAR PHYSICS LA English DT Article DE ANTINUCLEON ANNIHILATION; QUARK GLUON DEGREES OF FREEDOM; DYNAMIC SELECTION RULES ID PROTON-ANTIPROTON ANNIHILATION; QUARK REARRANGEMENT MODEL; FLUX-TUBE MODEL; PBARP ELASTIC-SCATTERING; MESON MESON SCATTERING; TOTAL CROSS-SECTIONS; BEAM MOMENTUM RANGE; PAIR-CREATION MODEL; TO-IMAGINARY RATIO; 2 PSEUDOSCALAR MESONS AB The nucleon-antinucleon (NNBAR) annihilation process provides a fertile testing ground for microscopic hadron exchange and/or quark models. We review a variety of such approaches here, including models which treat the underlying quark-gluon degrees of freedom explicitly. A first principles calculation of NNBAR annihilation in the framework of non-perturbative quantum chromodynamics (QCD) is still beyond our reach, so we adopt a more phenomenological approach, in which we try various annihilation topologies combined with different prescriptions for the dependence of the effective quark-antiquark (QQBAR) creation/destruction operator on spin, flavor and color. The NNBAR system offers a rich ensemble of annihilation channels, whose relative branching ratios BR provide strong constraints on dynamical models. Recent experiments at LEAR show that values of BR display a significant dependence on L, the NNBAR relative orbital angular momentum, spin S and isospin I. These dynamical selection rules (DSR), i.e. the suppression of transitions allowed a priori by conservation of the quantum numbers {J, pi, C, G}, provide key signatures of the annihilation mechanism, and suggest dynamical content beyond simple statistical or SU(2)/SU(3) flavor symmetry models. We investigate to what extent the observed DSR enable us to unravel the quark dynamics of the annihilation process. C1 UNIV TUBINGEN, INST THEORET PHYS, W-7400 TUBINGEN 1, GERMANY. TOHOKU UNIV, DEPT PHYS, SENDAI, MIYAGI 980, JAPAN. RP BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. NR 334 TC 147 Z9 147 U1 1 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0146-6410 J9 PROG PART NUCL PHYS JI Prog. Part. Nucl. Phys. PY 1992 VL 29 BP 87 EP 173 DI 10.1016/0146-6410(92)90004-L PG 87 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA JE715 UT WOS:A1992JE71500003 ER PT J AU JOHNSON, NR AF JOHNSON, NR TI COLLECTIVE PROPERTIES AND SHAPES OF NUCLEI AT VERY HIGH SPINS SO PROGRESS IN PARTICLE AND NUCLEAR PHYSICS LA English DT Article ID STATES; YB-160; YRAST; LINE RP JOHNSON, NR (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 31 TC 4 Z9 4 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0146-6410 J9 PROG PART NUCL PHYS JI Prog. Part. Nucl. Phys. PY 1992 VL 28 BP 215 EP 224 DI 10.1016/0146-6410(92)90021-S PG 10 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA HV056 UT WOS:A1992HV05600011 ER PT J AU WILLSAU, P HUBEL, H AZAIEZ, F DELEPLANQUE, MA DIAMOND, RM KORTEN, W MACCHIAVELLI, AO STEPHENS, FS KLUGE, H HANNACHI, F BACELAR, JC BECKER, JA BRINKMAN, MJ HENRY, EA KUHNERT, A WANG, TF DRAPER, JA RUBEL, E AF WILLSAU, P HUBEL, H AZAIEZ, F DELEPLANQUE, MA DIAMOND, RM KORTEN, W MACCHIAVELLI, AO STEPHENS, FS KLUGE, H HANNACHI, F BACELAR, JC BECKER, JA BRINKMAN, MJ HENRY, EA KUHNERT, A WANG, TF DRAPER, JA RUBEL, E TI LIFETIMES OF SUPERDEFORMED STATES IN 194PB SO PROGRESS IN PARTICLE AND NUCLEAR PHYSICS LA English DT Article DE LIFETIMES; DSAM; DYNAMIC MOMENT OF INERTIA; QUADRUPOLE MOMENTS; CENTRIFUGAL STRETCHING AB Lifetimes of members of the superdeformed band in 194Pb were measured by the Doppler-shift attenuation method. Quadrupole moments around 20 eb that are constant over the whole frequency range were derived. The results rule out large centrifugal stretching effects. C1 LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. HAHN MEITNER INST KERNFORSCH,W-1000 BERLIN,GERMANY. CTR SPECTROMETRIE NUCL & SPECTROMETRIE MASSE,F-91405 ORSAY,FRANCE. KERNFYS VERSNELLER INST,9747 AA GRONINGEN,NETHERLANDS. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF DAVIS,DAVIS,CA 95611. RP WILLSAU, P (reprint author), UNIV BONN,INST STRAHLEN & KERNPHYS,W-5300 BONN,GERMANY. RI KORTEN, Wolfram/H-3043-2013 NR 7 TC 4 Z9 4 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0146-6410 J9 PROG PART NUCL PHYS JI Prog. Part. Nucl. Phys. PY 1992 VL 28 BP 423 EP 425 DI 10.1016/0146-6410(92)90042-Z PG 3 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA HV056 UT WOS:A1992HV05600032 ER PT J AU LEE, IY AF LEE, IY TI THE GAMMASPHERE SO PROGRESS IN PARTICLE AND NUCLEAR PHYSICS LA English DT Article ID SUPERDEFORMED BAND AB GAMMASPHERE is one of a new generation of gamma ray detector arrays. It consists of 110 Compton-suppressed large volume Ge detectors. The design goal is to achieve high efficiency and peak-to-total value for four to five fold coincidence experiments. Such high-fold coincidence capability will provide new physics opportunities in areas such as high spins, transfer reactions, giant resonances, and astrophysics. The design of the detector and shield has been developed through extensive simulation calculations and an "electronic honeycomb" design was chosen. The electronics and computer systems are capable of operating at 50,000 event/sec. The design and development tasks are being carried out at several laboratories in the U.S. GAMMASPHERE will be sited initially at the 88-Inch Cyclotron at LBL as a national facility. The first experiment is planned in early 1993. RP LEE, IY (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 7 TC 9 Z9 9 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0146-6410 J9 PROG PART NUCL PHYS JI Prog. Part. Nucl. Phys. PY 1992 VL 28 BP 473 EP 485 PG 13 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA HV056 UT WOS:A1992HV05600039 ER PT B AU JOHNSON, NR AF JOHNSON, NR BE FAESSLER, A TI COLLECTIVE PROPERTIES AND SHAPES OF NUCLEI AT VERY HIGH SPINS SO PROGRESS IN PARTICLE AND NUCLEAR PHYSICS, VOL 28: 4-PI-HIGH-RESOLUTION GAMMA-RAY SPECTROSCOPY SE PROGRESS IN PARTICLE AND NUCLEAR PHYSICS LA English DT Proceedings Paper CT INTERNATIONAL SCHOOL OF NUCLEAR PHYSICS : 4-PI-HIGH-RESOLUTION GAMMA-RAY SPECTROSCOPY CY SEP 20-29, 1991 CL ERICE, ITALY ID STATES; YB-160; YRAST; LINE RP JOHNSON, NR (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA OXFORD BN 0-08-041860-0 J9 PROG PART NUCL PHYS PY 1992 BP 215 EP 224 PG 10 WC Physics, Nuclear; Spectroscopy SC Physics; Spectroscopy GA BV65C UT WOS:A1992BV65C00011 ER PT B AU LEE, IY AF LEE, IY BE FAESSLER, A TI THE GAMMASPHERE SO PROGRESS IN PARTICLE AND NUCLEAR PHYSICS, VOL 28: 4-PI-HIGH-RESOLUTION GAMMA-RAY SPECTROSCOPY SE PROGRESS IN PARTICLE AND NUCLEAR PHYSICS LA English DT Proceedings Paper CT INTERNATIONAL SCHOOL OF NUCLEAR PHYSICS : 4-PI-HIGH-RESOLUTION GAMMA-RAY SPECTROSCOPY CY SEP 20-29, 1991 CL ERICE, ITALY ID SUPERDEFORMED BAND RP LEE, IY (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA OXFORD BN 0-08-041860-0 J9 PROG PART NUCL PHYS PY 1992 BP 473 EP 485 PG 13 WC Physics, Nuclear; Spectroscopy SC Physics; Spectroscopy GA BV65C UT WOS:A1992BV65C00039 ER PT J AU HIPPESANWALD, S HERMANNS, M SOMERVILLE, SC AF HIPPESANWALD, S HERMANNS, M SOMERVILLE, SC TI ULTRASTRUCTURAL COMPARISON OF INCOMPATIBLE AND COMPATIBLE INTERACTIONS IN THE BARLEY POWDERY MILDEW DISEASE SO PROTOPLASMA LA English DT Article DE ERYSIPHE-GRAMINIS (= BLUMERIA-GRAMINIS); FREEZE SUBSTITUTION; HYPERSENSITIVE RESISTANCE; LOWICRYL EMBEDDING, MITOCHONDRIA; PAPILLAE; PROPANE JET FREEZER; ULTRARAPID FREEZING ID F-SP-HORDEI; ERYSIPHE-GRAMINIS; FREEZE-SUBSTITUTION; ELECTRON-MICROSCOPY; PENETRATION SITES; EPIDERMAL-CELLS; LEAVES; INFECTION; TEMPERATURE; PRESERVATION AB In the powdery mildew disease of barley, Erysiphe graminis f. sp. hordei forms an intimate relationship with compatible hosts, in which haustoria form in epidermal cells with no obvious detrimental effects on the host until late in the infection sequence. In incompatible interactions, by contrast, the deposition of papillae and localized host cell death have been correlated with the cessation of growth by E. g. hordei. With the advent of improved, low temperature methods of sample preparation, we felt that it was useful to reevaluate the structural details of interactions between barley and E. g. hordei by transmission electron microscopy. The haustoria that develop in susceptible barley lines appear highly metabolically active based on the occurrence of abundant endoplasmic reticulum, Golgi-like cistemae, and vesicles. In comparison, haustoria found in the resistant barley line exhibited varying signs of degradation. A striking clearing of the matrix and loss of cristae were typical early changes in the haustorial mitochondria in incompatible interactions. The absence of distinct endoplasmic reticulum and Golgi-like cisternae, the formation of vacuoles, and the occurrence of a distended sheath were characteristic of intermediate stages of haustorial degeneration. At more advanced stages of degeneration, haustoria were dominated by large vacuoles containing membrane fragments. This process of degeneration was not observed in haustoria of E. g. hordei developing in the susceptible barley line. C1 RHEIN WESTFAL TH AACHEN,INST BIOL 3,W-5100 AACHEN,GERMANY. MICHIGAN STATE UNIV,US DOE,PLANT RES LAB,E LANSING,MI 48824. RP HIPPESANWALD, S (reprint author), UNIV KIEL,INST BOT,OLSHAUSENSTR 40,W-2300 KIEL 1,GERMANY. NR 56 TC 34 Z9 37 U1 0 U2 4 PU SPRINGER-VERLAG WIEN PI VIENNA PA SACHSENPLATZ 4-6, PO BOX 89, A-1201 VIENNA, AUSTRIA SN 0033-183X J9 PROTOPLASMA JI Protoplasma PY 1992 VL 168 IS 1-2 BP 27 EP 40 DI 10.1007/BF01332648 PG 14 WC Plant Sciences; Cell Biology SC Plant Sciences; Cell Biology GA HX587 UT WOS:A1992HX58700005 ER PT J AU BREWER, L AF BREWER, L TI CHEMICAL THERMODYNAMICS IN THE FUTURE-DEVELOPMENT OF CHEMISTRY INCLUDING ENVIRONMENTAL-PROBLEMS SO PURE AND APPLIED CHEMISTRY LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON CALORIMETRY AND CHEMICAL THERMODYNAMICS, IN HONOR OF THE CENTENARY OF LUGININ THERMOCHEMICAL LABORATORY OF MOSCOW STATE UNIVERSITY CY JUN 23-27, 1991 CL MOSCOW, USSR SP INT UNION PURE & APPL CHEM, PHYS CHEM DIV, INT COUNCIL SCI UNIONS, COMM DATA SCI & TECHNOL, ACAD SCI USSR, MOSCOW STATE UNIV ID ACID-BASE THEORY; ELECTRONIC CONFIGURATIONS; LEWIS; ENERGIES AB High-temperature science will be facing unusual challenges in the decade ahead. New technological advances are requiring new materials with unusual properties that will either be prepared by high-temperature techniques or will need to have long-term stability at high temperatures in various environments. One of the major driving forces for new materials arises from the increasing public concern about environmental pollution. Equipment using volatile fluids that can survive up to the stratosphere and destroy the ozone will have to be replaced. Processes that emit sulfur oxides will have to be modified to reduce sulfur emission to very low values. The efficiency of solar energy devices will have to be improved and nuclear power plants will have to be designed to make serious accidents extremely unlikely so that energy production by combustion to carbon dioxide is greatly reduced. Many other examples can be given of the need for new materials. The possible combinations of the elements are enormous. The problems cannot be solved by trial and error procedures. Practical predictive models must be developed to narrow down the range of materials that might have the desired products. Examples of possible models will be discussed. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. RP BREWER, L (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 26 TC 3 Z9 3 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0033-4545 J9 PURE APPL CHEM JI Pure Appl. Chem. PD JAN PY 1992 VL 64 IS 1 BP 1 EP 8 DI 10.1351/pac199264010001 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA HA243 UT WOS:A1992HA24300001 ER PT J AU CHATTERS, JC HOOVER, KA AF CHATTERS, JC HOOVER, KA TI RESPONSE OF THE COLUMBIA RIVER FLUVIAL SYSTEM TO HOLOCENE CLIMATIC-CHANGE SO QUATERNARY RESEARCH LA English DT Article ID NORTH CASCADE RANGE; GLACIER PEAK; WASHINGTON RP CHATTERS, JC (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 45 TC 30 Z9 37 U1 1 U2 4 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0033-5894 J9 QUATERNARY RES JI Quat. Res. PD JAN PY 1992 VL 37 IS 1 BP 42 EP 59 DI 10.1016/0033-5894(92)90005-4 PG 18 WC Geography, Physical; Geosciences, Multidisciplinary SC Physical Geography; Geology GA GY482 UT WOS:A1992GY48200004 ER PT J AU KNUTSON, EO GOGOLAK, CV SCOFIELD, P KLEMIC, G AF KNUTSON, EO GOGOLAK, CV SCOFIELD, P KLEMIC, G TI MEASUREMENTS OF RADON PROGENY ACTIVITY ON TYPICAL INDOOR SURFACES SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL SYMP ON THE NATURAL RADIATION ENVIRONMENT ( NRE 5 ) CY SEP 22-28, 1991 CL SALZBURG, AUSTRIA AB A number of studies aimed at defining how well radon progeny on surfaces can be measured, information that is needed in order to test physical/mathematical models governing indoor radon progeny behaviour, are described. One experiment compared the deposition on to different surfaces. Only relatively small differences were found among metal, filter paper, broadcloth, corduroy fabric, vinyl wallpaper, glass, and latex paint, but polyethylene film collected two to four times as much as the others, due most likely to electrostatic charge on the plastic surface. Another experiment compared the gamma and gross alpha count methods of measuring surface activity for metal, filter paper, broadcloth and corduroy surfaces. No difference for the surfaces tested was found from which it is concluded that, even for rougher surfaces, progeny atoms deposit mainly on the outer layers. A final experiment compared in situ and surrogate-surface methods for measuring surface deposition. For most tests, the two methods agreed within 30%, and the average ratio was not significantly different from unity. Po-210 is a complication in the in situ method. An unexpected location effect was found in the experiments conducted in houses with high radon concentrations: the deposition on the ceiling was higher than on other surfaces. RP KNUTSON, EO (reprint author), US DOE,ENVIRONM MEASUREMENTS LAB,376 HUDSON ST,NEW YORK,NY 10014, USA. NR 0 TC 10 Z9 10 U1 0 U2 0 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 45 IS 1-4 SU S BP 313 EP 317 PG 5 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 LA673 UT WOS:A1992LA67300067 ER PT J AU GADGIL, AJ KONG, D NAZAROFF, WW AF GADGIL, AJ KONG, D NAZAROFF, WW TI DEPOSITION OF UNATTACHED RADON PROGENY FROM ENCLOSURE FLOWS SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL SYMP ON THE NATURAL RADIATION ENVIRONMENT ( NRE 5 ) CY SEP 22-28, 1991 CL SALZBURG, AUSTRIA AB Numerical predictions of spatial distribution and local deposition velocities of unattached Po-218 and Pb-212 to the surfaces of square two-dimensional enclosures under laminar natural convection flow are reported. The Grashof number (Gr) characterising the flow is chosen to be 1.6 x 10(10), in the middle of the three orders of magnitude range of Gr values found for natural convection flows in rooms. Deposition velocities are calculated for various locations on the enclosure surface for two different thermal boundary conditions. For the cases considered, the surface-averaged mean deposition velocity was found to be in the range (2-4) x 10(-4) m.s-1 for Po-212 and (1-3) x 10(-4) m.s-1 for Pb-212. The production and decay of Po-218 affects the spatial distribution of its concentration, the magnitude of its deposition velocity and its dependence on location compared with that of Pb-212, which practically behaves as a stable species with respect to the timescale of convective motion. The local deposition velocity is observed to depend strongly upon the position of the surface with respect to the flow. An order of magnitude difference between the maximum and minimum values of the deposition velocities for both species is seen. The results have significance for assessing the health risk associated with indoor exposure to Rn-222 and Rn-220 decay products and for investigating mass transport aspects of the more general problem of the interaction of air pollutants with indoor surfaces. RP GADGIL, AJ (reprint author), LAWRENCE BERKELEY LAB,INDOOR ENVIRONM PROGRAM,BERKELEY,CA 94720, USA. RI Nazaroff, William/C-4106-2008; OI Nazaroff, William/0000-0001-5645-3357; Gadgil, Ashok/0000-0002-0357-9455 NR 0 TC 1 Z9 1 U1 0 U2 1 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 45 IS 1-4 SU S BP 337 EP 341 PG 5 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 LA673 UT WOS:A1992LA67300072 ER PT J AU TANNER, AB OLSEN, CR AF TANNER, AB OLSEN, CR TI TECHNICAL HIGHLIGHTS OF THE AVAILABILITY AND ENTRY PROJECTS OF THE UNITED-STATES DEPARTMENT OF ENERGY RADON RESEARCH-PROGRAM SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL SYMP ON THE NATURAL RADIATION ENVIRONMENT ( NRE 5 ) CY SEP 22-28, 1991 CL SALZBURG, AUSTRIA AB Projects concerned with Ra-226 and Rn-222 occurrence have found that: (1) severe indoor Rn-222 concentrations are associated with U-bearing shear zones; (2) surface gamma ray surveys correlate with Rn-222 in soil gas; (3) sorption is important in dry soils and some building materials; (4) organically bound Ra-226 can be the principal source of Rn-222 in soil gas; and (5) passive detectors may seriously underestimate Rn-222 concentrations in the ground. Correlations enable reasonable prediction of Rn diffusion coefficient and soil permeability changes with changing soil moisture. Instrumented test structures permit monitoring the effects of important environmental variables on Rn entry. Multidimensional numerical models are being used to account for soil moisture, absorption, adsorption, diffusion and advection in Rn transport towards buildings. Other numerical models predict Rn-222 entry on the basis of Ra-226 concentration, emanation coefficient, and soil permeability, and show that the pressure gradients decrease sharply with distance from the entry cracks. C1 US DOE,DIV ENVIRONM SCI,WASHINGTON,DC 20585. NR 0 TC 3 Z9 3 U1 1 U2 1 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 45 IS 1-4 SU S BP 367 EP 372 PG 6 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA LA673 UT WOS:A1992LA67300078 ER PT J AU GADGIL, AJ AF GADGIL, AJ TI MODELS OF RADON ENTRY SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL SYMP ON THE NATURAL RADIATION ENVIRONMENT ( NRE 5 ) CY SEP 22-28, 1991 CL SALZBURG, AUSTRIA AB This paper reviews existing models of radon entry into houses. The primary mechanism of radon entry in houses with high indoor concentrations is, in most cases, convective entry of radon-bearing soil gas from the surrounding soil. The driving force for this convective entry is the small indoor-outdoor pressure difference arising from the stack effect and other causes. Entry points for the soil gas generally are the cracks or gaps in the basement sub-structure, or through other parts of the building shell directly in contact with the soil, although entry may also occur by means of flow through permeable concrete or cinder block walls of the sub-structure. Models using analytical solutions to idealised geometrical configurations with simplified boundary conditions obtain analytical tractability of equations to be solved at the cost of severe approximations; their strength is in the insights they offer with their solutions. Models based on lumped parameters attempt to characterise the significant physical behavioural characteristics of the soil gas and radon flow. When realistic approximations are desired for the boundary conditions and terms in the governing equations, numerical models must be used; these are usually based on finite difference or finite element solutions to the governing equations. Limited data are now available for experimental verification of model predictions. The models are briefly reviewed and their strengths and limitations are discussed. RP GADGIL, AJ (reprint author), LAWRENCE BERKELEY LAB,INDOOR ENVIRONM PROGRAM,BERKELEY,CA 94720, USA. OI Gadgil, Ashok/0000-0002-0357-9455 NR 0 TC 13 Z9 13 U1 0 U2 1 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 45 IS 1-4 SU S BP 373 EP 380 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 LA673 UT WOS:A1992LA67300079 ER PT J AU MILLER, KM AF MILLER, KM TI MEASUREMENTS OF EXTERNAL RADIATION IN UNITED-STATES DWELLINGS SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL SYMP ON THE NATURAL RADIATION ENVIRONMENT ( NRE 5 ) CY SEP 22-28, 1991 CL SALZBURG, AUSTRIA AB The results of a survey of terrestrial gamma radiation levels are reported for the United States. This database represents a total of 1074 measurements in and around 247 different dwellings in several different areas of the country. The absorbed dose rate in air outdoors was found to range between 14 and 118 nGy.h-1 and averaged 46.6 nGy.h-1, while for indoors it ranged between 12 and 160 nGy.h-1 and averaged 37.6 nGy.h-1. Apart from regional differences in the terrestrial gamma levels, variations of up to a factor of 2 can be seen in the same geographical area. Variations within a house are typically large, with basement living areas averaging 50% higher than second-floor areas. Houses of full brick construction had average indoor levels 50% higher than those for wood frame houses. The material used for interior wall construction was not found to strongly influence the indoor dose rates except for rooms containing brick, cinder block or stone. For wood frame houses, including those of brick veneer exteriors, a linear regression analysis indicates that the average indoor dose rate can be reasonably well predicted based on a constant, which relates to the building contribution, and a shielding factor for the outdoor dose rate. Using the data collected in this survey and the population weighted mean outdoor absorbed dose rate in air reported for the US, the corresponding mean indoor value is estimated to be 37 nGy.h-1. This value is in the low end of the range reported for other countries and is about half the estimated worldwide average of 70 nGy.h-1. RP MILLER, KM (reprint author), US DOE,ENVIRONM MEASUREMENTS LAB,376 HUDSON ST,NEW YORK,NY 10014, USA. NR 0 TC 9 Z9 9 U1 0 U2 1 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 45 IS 1-4 SU S BP 535 EP 539 PG 5 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 LA673 UT WOS:A1992LA67300114 ER PT J AU TU, KW GEORGE, AC LOWDER, WM GOGOLAK, CV AF TU, KW GEORGE, AC LOWDER, WM GOGOLAK, CV TI INDOOR THORON AND RADON PROGENY MEASUREMENTS SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL SYMP ON THE NATURAL RADIATION ENVIRONMENT ( NRE 5 ) CY SEP 22-28, 1991 CL SALZBURG, AUSTRIA AB Measurements of indoor thoron (Rn-220) and radon (Rn-222) progeny activities were conducted in 40 homes and six public buildings in five states. A commercial alpha spectrometer system and four portable alpha integrating sampling monitors using diffused junction silicon detectors were used for sampling and recording of radionuclide data, in particular the potential alpha energy concentrations (PAEC). The data were analysed for the ratios of PAEC-Rn-220 to PAEC-Rn-222, and the correlations between the two quantities, and their estimated annual effective dose equivalent (AEDE). The results show that the PAEC ratios were 0.09, 0.6, 0.55, and 0.47, respectively, for all homes with the PAEC-Rn-222 > 400, between 100 and 40(), < 100 nJ.m-3, and the total of alt homes tested; the AEDE ratios were 0.03, 0.21, ().19 and 0.16, respectively. No strong correlations were found between PAEC-Rn-220 and PAEC-Rn-222, and between basement and ground floor data for PAEC-Rn-220, but the PAEC-Rn-222 data showed a strong correlation between the basement and the ground floor values. Simultaneous measurements of PAEC-Rn-220 and PAEC-Rn-222 on the ground floor and in the basement of each of the 23 single-family houses tested suggest that Rn-220 entry from building materials may be as significant as from the underlying soil. RP TU, KW (reprint author), US DOE,ENVIRONM MEASUREMENTS LAB,376 HUDSON ST,NEW YORK,NY 10014, USA. NR 0 TC 3 Z9 3 U1 0 U2 0 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 45 IS 1-4 SU S BP 557 EP 560 PG 4 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA LA673 UT WOS:A1992LA67300119 ER PT J AU CROSS, FT AF CROSS, FT TI EXPERIMENTAL, STATISTICAL AND BIOLOGICAL MODELS OF RADON CARCINOGENESIS SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL SYMP ON THE NATURAL RADIATION ENVIRONMENT ( NRE 5 ) CY SEP 22-28, 1991 CL SALZBURG, AUSTRIA AB Risk models developed for underground miners have not been consistently validated in studies of populations exposed to indoor radon. Imprecision in risk estimates results principally from differences between exposures in mines as compared with domestic environments and from uncertainties about the interaction between cigarette smoking and exposure to radon decay products. Uncertainties in extrapolating miner data to domestic exposures can be reduced by means of a broad-based health effects research programme that addresses the interrelated issues of exposure, respiratory tract dose, carcinogenesis (molecular/cellular and animal studies, plus developing biological and statistical models) and the relationship of radon to smoking and other co-pollutant exposures. This article reviews experimental animal data on radon carcinogenesis observed primarily in rats at Pacific Northwest Laboratory. Recent experimental and mechanistic carcinogenesis models of exposures to radon, uranium ore dust, and cigarette smoke are presented with statistical analyses of animal data. RP CROSS, FT (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 45 IS 1-4 SU S BP 629 EP 633 PG 5 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 LA673 UT WOS:A1992LA67300133 ER PT J AU GEORGE, AC KNUTSON, EO AF GEORGE, AC KNUTSON, EO TI RADON PROGENY DEPOSITION IN THE NASAL AND TRACHEOBRONCHIAL REGIONS OF THE RESPIRATORY-TRACT SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL SYMP ON THE NATURAL RADIATION ENVIRONMENT ( NRE 5 ) CY SEP 22-28, 1991 CL SALZBURG, AUSTRIA AB The assessment of the radiation dose to the respiratory system from Rn-222 progeny requires knowledge of the radioactivity deposited in the tracheobronchial region. To determine the amount of radioactivity deposited, a sampling system that simulates the collection characteristics of the human nose and tracheobronchial regions was used. Deposition measurements were made at different conditions of exposure for aerosol types, concentrations, and sizes encountered in residential buildings. Test aerosols included ordinary room air particles, cigarette smoke, wax aerosol, electric heater and methane cooking gas particles. For comparison, the fraction expected to deposit in the tracheobronchial region was also computed from diffusion battery measurements of particle size distribution. The latter measurements also yielded the activity median diameter and the unattached fraction of the test aerosol. The results indicate high nasal and tracheobronchial deposition of Rn-222 progeny that were attached to the smaller carrier aerosol. With the electric heater and cooking gas particles, tracheobronchial deposition ranged from 13.2 to 26.3%. For all other particle sizes and conditions of exposure, both nasal and tracheobronchial depositions were lower. For ordinary room conditions, the tracheobronchial deposition averaged 4.7%. RP GEORGE, AC (reprint author), US DOE,ENVIRONM MEASUREMENTS LAB,376 HUDSON ST,NEW YORK,NY 10014, USA. NR 0 TC 8 Z9 8 U1 0 U2 0 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 45 IS 1-4 SU S BP 689 EP 693 PG 5 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 LA673 UT WOS:A1992LA67300146 ER PT J AU ROSE, S SINNAEVE, J OLAST, M AF ROSE, S SINNAEVE, J OLAST, M TI DOE CEC WORKING PARTY ON RADON-RELATED RISK SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL SYMP ON THE NATURAL RADIATION ENVIRONMENT ( NRE 5 ) CY SEP 22-28, 1991 CL SALZBURG, AUSTRIA AB This brief paper summarises an effort by the Commission of European Communities and the US Department of Energy to evaluate current knowledge on radon for its implications to current risk numbers and to determine from this effort the future direction of radon research at both agencies. Two references from the US National Academy of Science on desirable attributes of a risk assessment report are provided as a model. RP ROSE, S (reprint author), US DOE,19901 GERMANTOWN RD,ER 72 OHER,GERMANTOWN,MD 20874, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 45 IS 1-4 SU S BP 699 EP 701 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 LA673 UT WOS:A1992LA67300148 ER PT J AU WHITE, RM BROERSE, JJ DELUCA, PM DIETZE, G HAIGHT, RC KAWASHIMA, K MENZEL, HG OLSSON, N WAMBERSIE, A AF WHITE, RM BROERSE, JJ DELUCA, PM DIETZE, G HAIGHT, RC KAWASHIMA, K MENZEL, HG OLSSON, N WAMBERSIE, A TI STATUS OF NUCLEAR-DATA FOR USE IN NEUTRON THERAPY SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT 7TH SYMP ON NEUTRON DOSIMETRY CY OCT 14-18, 1991 CL BERLIN, GERMANY SP COMMISS EUROPEAN COMMUNITIES, PHYS TECHN BUNDESANSTALT, US DOE, OFF HLTH & ENVIRONM RES, FORSCHUNGSZENTRUM UMWELT & GESUNDHEIT, HELMHOLTZ FONDS AB Optimisation of neutron therapy requires nuclear cross section data for: (1) the source reactions for neutron production, (2) the design of collimators and shields, (3) the calculation of absorbed dose in the irradiated tissues, (4) microdosimetry, and (5) studies of the influence of radiation quality on biological effects. Under the auspices of the International Atomic Energy Agency, a Coordinated Research Programme (CRP) has been underway since 1987 to assess the status of these nuclear data, to coordinate research efforts, to report recent progress, and to recommend acceptance of appropriate data and further research where necessary. In this paper, we outline the results of the CRP's final report (to be published) and evaluate the status of the most critical nuclear data needs for therapy, i.e. neutron kerma calculations and measurements from 10 to 70 MeV. Recommended values for the hydrogen kerma factor and the carbon-to-oxygen kerma factor ratio from 10 to 70 MeV are given with estimates of the current uncertainties. RP WHITE, RM (reprint author), LAWRENCE LIVERMORE NATL LAB,NUCL DATA GRP,L-298,POB 808,LIVERMORE,CA 94550, USA. NR 0 TC 27 Z9 27 U1 1 U2 1 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 44 IS 1-4 BP 11 EP 20 PG 10 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 KA445 UT WOS:A1992KA44500003 ER PT J AU TANNER, JE PIPER, RK LEONOWICH, JA FAUST, LG AF TANNER, JE PIPER, RK LEONOWICH, JA FAUST, LG TI VERIFICATION OF AN EFFECTIVE DOSE EQUIVALENT MODEL FOR NEUTRONS SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT 7TH SYMP ON NEUTRON DOSIMETRY CY OCT 14-18, 1991 CL BERLIN, GERMANY SP COMMISS EUROPEAN COMMUNITIES, PHYS TECHN BUNDESANSTALT, US DOE, OFF HLTH & ENVIRONM RES, FORSCHUNGSZENTRUM UMWELT & GESUNDHEIT, HELMHOLTZ FONDS AB Since the effective dose equivalent, based on the weighted sum of organ dose equivalents, is not a directly measurable quantity, it must be estimated with the assistance of computer modelling techniques and a knowledge of the incident radiation field. Although extreme accuracy is not necessary for radiation protection purposes, a few well chosen measurements are required to confirm the theoretical models. Neutron doses and dose equivalents were measured in a RANDO phantom at specific locations using thermoluminescence dosemeters, etched track dosemeters, and a 1.27 cm (1/2 in) tissue-equivalent proportional counter. The phantom was exposed to a bare and a D2O-moderated Cf-252 neutron source at the Pacific Northwest Laboratory's Low Scatter Facility. The Monte Carlo code MCNP with the MIRD-V mathematical phantom was used to model the human body and to calculate the organ doses and dose equivalents. The experimental methods are described and the results of the measurements are compared with the calculations. RP TANNER, JE (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 0 TC 6 Z9 6 U1 0 U2 0 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 44 IS 1-4 BP 171 EP 174 PG 4 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA KA445 UT WOS:A1992KA44500037 ER PT J AU IPE, NE LIU, JC BUDDEMEIER, BR MILES, CJ YODER, RC AF IPE, NE LIU, JC BUDDEMEIER, BR MILES, CJ YODER, RC TI A COMPARISON OF THE NEUTRON RESPONSE OF CR-39 MADE BY DIFFERENT MANUFACTURERS SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT 7TH SYMP ON NEUTRON DOSIMETRY CY OCT 14-18, 1991 CL BERLIN, GERMANY SP COMMISS EUROPEAN COMMUNITIES, PHYS TECHN BUNDESANSTALT, US DOE, OFF HLTH & ENVIRONM RES, FORSCHUNGSZENTRUM UMWELT & GESUNDHEIT, HELMHOLTZ FONDS AB CR-39 obtained from American Acrylics and Plastics, Inc. (AA), N. E. Technology, Ltd. (NE), and Tech/Ops Landauer, Inc. (LT) were exposed to radioisotopic neutron sources at SLAC, and moderated Cf-252 at ORNL. The AA and NE detectors (0.06 cm thick) were electrochemically etched (a pre-etch for 1 h and 45 min in 6.5 N KOH at 60-degrees-C for a 5 h etch at 3000 V and 60 Hz, a 23 min blow-up step at 2 kHz and a post-etch for 15 min). The LT detectors were chemically etched in 5.5 N NaOH at 70-degrees-C for 15.5 h. and some AA, NE and LT detectors in 6.25 N NaOH at 70-degrees-C for 6 h. A pre-etch step in 60% methanol and 40% NaOH at 70-degrees-C for 1 h was added for some NE detectors. The results of the background track density and neutron dose equivalent response are reported. RP IPE, NE (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94039, USA. NR 0 TC 3 Z9 4 U1 0 U2 0 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 44 IS 1-4 BP 317 EP 321 PG 5 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 KA445 UT WOS:A1992KA44500067 ER PT J AU KNUTSON, EO HUBBARD, LM BOLKER, BM AF KNUTSON, EO HUBBARD, LM BOLKER, BM TI DETERMINATION OF THE SURFACE TO VOLUME RATIO IN HOMES FROM MEASUREMENTS OF RADON AND ITS PROGENY SO RADIATION PROTECTION DOSIMETRY LA English DT Note AB An activity balance method is proposed for measuring the ratio of surface area to volume in houses. The method is based on the assumption that, after accounting for surface as well as airborne activity, Po-218 is nearly in secular equilibrium with its parent, Rn-222. Numerical experiments have shown that this is true within about 7%, even in cases of rapidly changing Rn-222 concentrations and moderately high ventilation rates. For the experiments, conventional methods were used to measure the concentrations of airborne Po-218 and Rn-222, and a surrogate surface method was used to measure the surface concentration of Po-218. Measurements in three high radon level houses yielded an average value of 4.9 m-1 for the surface to volume ratio. There were differences between houses, and these differences were plausible based on room architecture and furnishings. RP KNUTSON, EO (reprint author), US DOE,ENVIRONM MEASUREMENTS LAB,376 HUDSON ST,NEW YORK,NY 10014, USA. NR 0 TC 7 Z9 7 U1 0 U2 0 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 42 IS 2 BP 121 EP 126 PG 6 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA JU535 UT WOS:A1992JU53500008 ER PT J AU STEWART, RD MCDONALD, JC TANNER, JE HARTY, R AF STEWART, RD MCDONALD, JC TANNER, JE HARTY, R TI CALCULATION OF NEUTRON FLUENCE-TO-DOSE CONVERSION FACTORS FOR EXTREMITIES SO RADIATION PROTECTION DOSIMETRY LA English DT Article AB The Pacific Northwest Laboratory (PNL) is developing a standard for the performance testing of personnel extremity dosemeters for the US Department of Energy (DOE). Part of this effort requires the calculation of neutron fluence-to-dose conversion factors for finger and wrist/ankle extremities. This study focuses on conversion factors for two types of extremity models: (4) the polymethyl methacrylate (PMMA) phantom (as specified in the draft standard for performance testing of extremity dosemeters) and (2) more realistic extremity models composed of tissue and bone. Calculations for each type of model are based on both bare and D2O-moderated Cf-252 sources. The results are then tabulated and compared with whole-body conversion factors. More appropriate average quality factors for the extremity models have also been computed from the energy dependent neutron fluence. Tabulated results show that conversion factors for both types of extremity phantoms are 3 to 28% lower than the corresponding whole-body phantom conversion factors for Cf-252 neutron sources. This difference in extremity and whole-body conversion factors is attributable to the proportionally smaller amount of scattering that occurs in the extremity phantoms compared to whole-body phantoms. RP STEWART, RD (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. RI Stewart, Rob/A-2511-2009 NR 0 TC 1 Z9 1 U1 0 U2 0 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 42 IS 4 BP 279 EP 286 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 KD684 UT WOS:A1992KD68400003 ER PT J AU SLATKIN, DN KALEFERA, JA BALBI, KE WIELOPOLSKI, L ROSEN, JF AF SLATKIN, DN KALEFERA, JA BALBI, KE WIELOPOLSKI, L ROSEN, JF TI L-LINE X-RAY-FLUORESCENCE OF TIBIAL LEAD - CORRECTION AND ADJUSTMENT OF RADIATION RISK TO ICRP 60 SO RADIATION PROTECTION DOSIMETRY LA English DT Note AB Effective doses E (ICRP 60, 1991) to adults and children from a non-invasive assessment of tibial bone lead by L-line X ray fluorescence (LXRF) are calculated using published absorbed dose data. E is 1.0 muSv for a 5 year old child and 0.3 muSv for an adult. LXRF effective dose equivalents H(E) (ICRP 26, 1987) calculated from the same data were previously overestimated about twofold and should have been reported as 1.7 muSv for a 5 year old child and about 0.7 muSv for an adult. Differences between H(E) and E are largely due to an ICRP recommended reduction of the tissue weighting factor W(T) for 'bone surface' from 0.03 (ICRP 26) to 0.01 (ICRP 60). The proportion of E from the sum of all of the W(T) weighted equivalent doses to tissues other than red bone marrow ranges from 48% in a 1 year old child to over 99% in adults. RP SLATKIN, DN (reprint author), BROOKHAVEN NATL LAB,DEPT MED,CLIN RES CTR,UPTON,NY 11973, USA. NR 0 TC 6 Z9 7 U1 0 U2 0 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 42 IS 4 BP 319 EP 322 PG 4 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA KD684 UT WOS:A1992KD68400009 ER PT J AU BHATTACHARYYA, MH BREITENSTEIN, BD METIVIER, H MUGGENBURG, BA STRADLING, GN VOLF, V AF BHATTACHARYYA, MH BREITENSTEIN, BD METIVIER, H MUGGENBURG, BA STRADLING, GN VOLF, V TI GUIDEBOOK FOR THE TREATMENT OF ACCIDENTAL INTERNAL RADIONUCLIDE CONTAMINATION OF WORKERS SO RADIATION PROTECTION DOSIMETRY LA English DT Article RP BHATTACHARYYA, MH (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 0 TC 19 Z9 19 U1 0 U2 2 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 41 IS 1 BP 1 EP 42 PG 42 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 JA832 UT WOS:A1992JA83200001 ER PT J AU STUBBS, JB AF STUBBS, JB TI RESULTS FROM A NEW MATHEMATICAL-MODEL OF GASTROINTESTINAL TRANSIT THAT INCORPORATES AGE AND GENDER-DEPENDENT PHYSIOLOGICAL-PARAMETERS SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT WORKSHOP ON AGE-DEPENDENT FACTORS IN THE BIOKINETICS AND DOSIMETRY OF RADIONUCLIDES CY NOV 05-08, 1991 CL SCHLOSS ELMAU, GERMANY SP COMMISS EUROPEAN COMMUNITIES, US DOE, EUROPEAN LATE EFFECTS PROJECT GRP AB Recently published data on effects of age and gender-dependent GI physiology and motility have been used to develop a new mathematical model describing the transit and absorption of substances through the GI tract. This mathematical description of GI tract kinetics utilises more physiologically accurate transit processes than the ICRP Report 30 GI model. The model uses a combination of zero and first-order kinetics to describe motility. Some of the physiological parameters that the new model uses are gender, age, phase of the menstrual cycle, meal composition and gastric phase (solid versus liquid). A computer algorithm based on this model has been derived and results for young males are compared to those of the ICRP 30 model. Comparison of gastrointestinal residence times for Tc-99m and In-111 labelled compounds, as a function of gender and age, are also presented. RP STUBBS, JB (reprint author), OAK RIDGE ASSOCIATED UNIV,DIV MED SCI,POB 117,OAK RIDGE,TN 37830, USA. NR 0 TC 11 Z9 11 U1 0 U2 1 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 41 IS 2-4 BP 63 EP 69 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 JE773 UT WOS:A1992JE77300004 ER PT J AU WATSON, EE AF WATSON, EE TI RADIATION-DOSE ESTIMATES FOR THE FETUS FROM INTAKES OF GALLIUM CITRATE BY THE MOTHER SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT WORKSHOP ON AGE-DEPENDENT FACTORS IN THE BIOKINETICS AND DOSIMETRY OF RADIONUCLIDES CY NOV 05-08, 1991 CL SCHLOSS ELMAU, GERMANY SP COMMISS EUROPEAN COMMUNITIES, US DOE, EUROPEAN LATE EFFECTS PROJECT GRP AB Ga-67 in the form of citrate is administered to patients for tumour, cyst, and abscess imaging. On rare occasions this radiopharmaceutical is given to a pregnant woman. In addition, nuclear medicine technologists who are pregnant may be exposed to a possible intake of the material. Therefore, the radiation dose to the fetus from Ga-67 taken in by the pregnant woman is of interest to physicians, health physicists, radiation workers, and others. information about the distribution and retention of the radionuclide in the pregnant woman, particularly in the placenta and fetus, is limited and must be extrapolated from animal data. Studies have shown that gallium administered as citrate crosses the placenta into the fetus; however, the concentration in the placenta appears to be considerably greater than that in the fetus. Little is known about the retention of gallium in the fetus and placenta. In this paper, the available data on the concentrations in the placenta and fetus will be combined with data on the biokinetics of gallium in the woman to provide a model for dose calculation. The absorbed fractions calculated from the pregnant woman models developed by the Radiopharmaceutical Internal Dose Information Center will be used to provide dose estimates for the radioisotopes of gallium. RP WATSON, EE (reprint author), OAK RIDGE ASSOCIATED UNIV INC,POB 117,OAK RIDGE,TN 37831, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 41 IS 2-4 BP 123 EP 126 PG 4 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA JE773 UT WOS:A1992JE77300014 ER PT J AU LEGGETT, RW AF LEGGETT, RW TI A GENERIC AGE-SPECIFIC BIOKINETIC MODEL FOR CALCIUM-LIKE ELEMENTS SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT WORKSHOP ON AGE-DEPENDENT FACTORS IN THE BIOKINETICS AND DOSIMETRY OF RADIONUCLIDES CY NOV 05-08, 1991 CL SCHLOSS ELMAU, GERMANY SP COMMISS EUROPEAN COMMUNITIES, US DOE, EUROPEAN LATE EFFECTS PROJECT GRP AB Publication No. 56 of the International Commission on Radiological Protection (ICRP) introduces a generic model structure to address the age-specific biokinetics of 'calcium-like' radionuclides, including Sr, Ba, and Ra, and less complete physiological analogues of Ca, such as Pb and U, in humans. This paper outlines the conceptual basis for the model, summarises the selection of parameter values for the alkaline earth elements, and describes special features of the model included for consideration of Pb. The model differs in form from the alkaline earth model for adult man described in Publication No. 20 of the ICRP but depicts similar processes of skeletal uptake and removal. In contrast to the earlier alkaline earth model, parameter values are age specific, redeposition of biologically removed activity is treated explicitly, diminution of activity in bone volume is assumed to be a first-order process, and soft tissues are addressed explicitly rather than as the whole body minus bone and blood. RP LEGGETT, RW (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831, USA. NR 0 TC 34 Z9 34 U1 1 U2 3 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 41 IS 2-4 BP 183 EP 198 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 JE773 UT WOS:A1992JE77300026 ER PT J AU ECKERMAN, KF LEGGETT, RW WILLIAMS, LR AF ECKERMAN, KF LEGGETT, RW WILLIAMS, LR TI AN ELEMENTARY METHOD FOR SOLVING COMPARTMENTAL-MODELS WITH TIME-DEPENDENT COEFFICIENTS SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT WORKSHOP ON AGE-DEPENDENT FACTORS IN THE BIOKINETICS AND DOSIMETRY OF RADIONUCLIDES CY NOV 05-08, 1991 CL SCHLOSS ELMAU, GERMANY SP COMMISS EUROPEAN COMMUNITIES, US DOE, EUROPEAN LATE EFFECTS PROJECT GRP AB Several of the biokinetic models used in ICRP Publication 56, Age-dependent Doses to the Public from Exposures to Radionuclides, depict the movement of materials among explicitly defined organs and tissues using transfer coefficients that vary continuously with age from infancy to adulthood. Such physiologically and/or biologically based models are appealing because of the identifiability of model components, but their application has been limited by the general perception that such models can only be evaluated using sophisticated mathematical tools. The purpose of this paper is to describe an elementary method for solving complex compartmental models with time-dependent transfer coefficients. The method has practically no limitations on the number of compartments or connections between compartments and thus is applicable to a wide class of models, including those that depict recycling of material. We illustrate the method by applications to the age-specific biokinetic models described in ICRP Publication 56. RP ECKERMAN, KF (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831, USA. NR 0 TC 8 Z9 8 U1 0 U2 1 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 41 IS 2-4 BP 257 EP 263 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 JE773 UT WOS:A1992JE77300036 ER PT J AU SIKOV, MR AF SIKOV, MR TI HAZARDS AND RISKS FROM PRENATAL IRRADIATION - EMPHASIS ON INTERNAL RADIONUCLIDE EXPOSURES SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT WORKSHOP ON AGE-DEPENDENT FACTORS IN THE BIOKINETICS AND DOSIMETRY OF RADIONUCLIDES CY NOV 05-08, 1991 CL SCHLOSS ELMAU, GERMANY SP COMMISS EUROPEAN COMMUNITIES, US DOE, EUROPEAN LATE EFFECTS PROJECT GRP AB Irradiation during gestation produces dose- and stage-dependent effects including teratisms, prenatal or neonatal mortality, and altered size, structure, or function of the foetus and its organs. The general effects from internal radionuclide and external irradiation exposures are similar, as are the underlying physical processes and pathogenesis. Radionuclides involve stage-related differences in placental transfer and deposition, and deliver differential radiation doses to extra-embryonic structures and progenitor tissues. Despite differences in likelihoods, delayed effects with either exposure modality include growth depressions, shortened life span, and altered morphology or function of organs, especially the central nervous system. Dose-related increased tumour incidences of pituitary, thyroid, bone, liver, and haematopoietic tissues have been identified in offspring after perinatal exposures of animals. Not all of these have been found in human populations, while other effects, such as mental retardation, do not have distinct correlates in laboratory animals. This paper summarises the consensus on risk and threshold dose ranges, suggests magnitudes of dose for other alterations, and integrates overall patterns of aetiologic events and their relationships to effect. RP SIKOV, MR (reprint author), PACIFIC NW LAB, DEPT BIOL & CHEM, RICHLAND, WA 99352 USA. NR 0 TC 5 Z9 5 U1 0 U2 1 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 41 IS 2-4 BP 265 EP 272 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 JE773 UT WOS:A1992JE77300037 ER PT J AU MCDONALD, JC SWINTH, KL SELBY, JM LOESCH, RM GLADHILL, RL CARLSON, RD AF MCDONALD, JC SWINTH, KL SELBY, JM LOESCH, RM GLADHILL, RL CARLSON, RD TI UNITED-STATES ACCREDITATION PROGRAMS FOR PERSONAL RADIATION-DOSIMETRY SO RADIATION PROTECTION DOSIMETRY LA English DT Article AB In order to verify an acceptable level of safety in the workplace, it is necessary to measure the quantity of ionising radiation to which radiation workers could be, or actually are, exposed. At present, there are organisations capable of providing measurement results with good accuracy and precision. These organisations may provide personal dosimetry services to their own facilities, or to others on a contractual basis. They generally have high quality equipment and well trained personnel. However, in today's climate, it is important to demonstrate and document that these systems and services to others meet national standards of quality. In order to provide a higher level of confidence in the results generated by organisations that provide personal dosimetry services in the US, two accreditation programmes have been established. They are the Department of Energy Laboratory Accreditation Program (DOELAP) and the National Voluntary Laboratory Accreditation Program (NVLAP). These two programmes will be described and results will be given, along with plans for future development. RP MCDONALD, JC (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 0 TC 7 Z9 7 U1 0 U2 0 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 40 IS 1 BP 9 EP 16 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 HH762 UT WOS:A1992HH76200003 ER PT J AU BUCKNER, MA SIMS, CS AF BUCKNER, MA SIMS, CS TI EXPLAINING SOME OBSERVED RESPONSE ANOMALIES OF THE BD-100R BUBBLE DETECTOR SO RADIATION PROTECTION DOSIMETRY LA English DT Letter RP BUCKNER, MA (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1992 VL 40 IS 1 BP 63 EP 64 PG 2 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA HH762 UT WOS:A1992HH76200012 ER PT J AU GRAHN, D LOMBARD, LS CARNES, BA AF GRAHN, D LOMBARD, LS CARNES, BA TI THE COMPARATIVE TUMORIGENIC EFFECTS OF FISSION NEUTRONS AND CO-60 GAMMA-RAYS IN THE B6CF1 MOUSE SO RADIATION RESEARCH LA English DT Article ID TERM FRACTIONATED EXPOSURES; NEOPLASTIC DISEASE; TUMOR-INDUCTION; DOSE-RATE; FEMALE MICE; LIFE; IRRADIATION; RADIATION; CARCINOGENESIS; SINGLE RP GRAHN, D (reprint author), ARGONNE NATL LAB,DIV BIOL & MED RES,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 43 TC 47 Z9 47 U1 0 U2 0 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD JAN PY 1992 VL 129 IS 1 BP 19 EP 36 DI 10.2307/3577899 PG 18 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA GY320 UT WOS:A1992GY32000003 PM 1728054 ER PT J AU SCHWARTZ, JL AF SCHWARTZ, JL TI THE RADIOSENSITIVITY OF THE CHROMOSOMES OF THE CELLS OF HUMAN SQUAMOUS-CELL CARCINOMA CELL-LINES SO RADIATION RESEARCH LA English DT Article ID DOUBLE-STRAND BREAKS; CHINESE-HAMSTER CELLS; HUMAN-TUMOR CELLS; MAMMALIAN-CELLS; RADIATION SENSITIVITY; IONIZING-RADIATION; ORAL CAVITY; DNA CONTENT; ABERRATIONS; REPAIR C1 UNIV CHICAGO,DEPT RADIAT & CELLULAR ONCOL,CHICAGO,IL 60637. RP SCHWARTZ, JL (reprint author), ARGONNE NATL LAB,DIV BIOL & MED RES,9700 S CASS AVE,BLDG 202,ARGONNE,IL 60439, USA. FU NCI NIH HHS [CA 42596] NR 35 TC 35 Z9 35 U1 0 U2 1 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD JAN PY 1992 VL 129 IS 1 BP 96 EP 101 DI 10.2307/3577908 PG 6 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA GY320 UT WOS:A1992GY32000012 PM 1728062 ER PT J AU ULLRICH, RL ALLEN, B LEE, W SATTERFIELD, LC JERNIGAN, MC AF ULLRICH, RL ALLEN, B LEE, W SATTERFIELD, LC JERNIGAN, MC TI INDUCTION OF PHENOTYPICALLY ALTERED MAMMARY EPITHELIAL-CELLS BY NEUTRONS AND GAMMA-RAYS SO RADIATION RESEARCH LA English DT Article ID FISSION-SPECTRUM NEUTRONS; ONCOGENIC TRANSFORMATION; BALB/C MICE; EXPRESSION C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. RP ULLRICH, RL (reprint author), UNIV TEXAS,MED BRANCH,DEPT RADIAT THERAPY,DIV BIOL,GALVESTON,TX 77550, USA. NR 16 TC 2 Z9 2 U1 0 U2 0 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD JAN PY 1992 VL 129 IS 1 BP 102 EP 106 DI 10.2307/3577909 PG 5 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA GY320 UT WOS:A1992GY32000013 PM 1530801 ER PT J AU BREWER, KN AF BREWER, KN TI CALCINER PILOT-PLANT WASTE MINIMIZATION PRACTICES AT THE ICPP SO RADIOACTIVE WASTE MANAGEMENT AND ENVIRONMENTAL RESTORATION LA English DT Article DE CALCINE; CALCINER PILOT PLANT; HAZARDOUS WASTE; NON-HAZARDOUS WASTE; RECYCLING; SEGREGATION; WASTE MINIMIZATION; WASTE REDUCTION RP BREWER, KN (reprint author), WESTINGHOUSE IDAHO NUCL CO INC,IDAHO FALLS,ID, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU HARWOOD ACAD PUBL GMBH PI READING PA C/O STBS LTD, PO BOX 90, READING, BERKS, ENGLAND RG1 8JL SN 0739-5876 J9 RADIOACT WASTE MANAG JI Radioact. Waste Manage. Environ. Restor. PY 1992 VL 17 IS 1 BP 53 EP 62 PG 10 WC Engineering, Environmental; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA HQ731 UT WOS:A1992HQ73100005 ER PT J AU VOGEL, JS AF VOGEL, JS TI RAPID PRODUCTION OF GRAPHITE WITHOUT CONTAMINATION FOR BIOMEDICAL AMS SO RADIOCARBON LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL RADIOCARBON CONF ( 14C14 ) CY MAY 20-24, 1991 CL TUCSON, AZ SP ASSOC CARBON FOURTEEN LABS, PAUL E DAMON, HYDRO GEO CHEM, PACKARD INSTRUMENT, RES CORP, UNIV ARIZONA, US USSR COOPERAT FIELD BASIC SCI RES PROGRAM, WALLAC OY ID SAMPLES; PRECISION; TARGETS AB The application of AMS to the detection of C-14 makes possible a new class of sensitive experiments in molecular biology. Such experiments inherently produce large numbers of samples for the determination of biological variability in molecular interactions. The samples vary in C-14 concentration over many orders of magnitude. We added TiH2 to aid the reduction of CO2 by zinc in a sealed tube to reproducibly make graphite without sample cross-contamination. The CO2 is transferred from a combustion tube to the reaction tube through a disposable plastic manifold. The sealed tubes are heated to a single-reaction temperature in a muffle furnace. The process is complete within 5 h. Bulk isotopic fractionation in the finished graphite is less than 0.5%. RP VOGEL, JS (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR ACCELERATOR MASS SPECTROMETRY,BOX 808 L-397,LIVERMORE,CA 94551, USA. NR 10 TC 192 Z9 193 U1 0 U2 11 PU UNIV ARIZONA DEPT GEOSCIENCES PI TUCSON PA RADIOCARBON 4717 E FORT LOWELL RD, TUCSON, AZ 85712 SN 0033-8222 J9 RADIOCARBON JI Radiocarbon PY 1992 VL 34 IS 3 BP 344 EP 350 PG 7 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KF389 UT WOS:A1992KF38900012 ER PT J AU KUTSCHERA, W AHMAD, I PAUL, M AF KUTSCHERA, W AHMAD, I PAUL, M TI HALF-LIFE DETERMINATION OF CA-41 AND SOME OTHER RADIOISOTOPES SO RADIOCARBON LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL RADIOCARBON CONF ( 14C14 ) CY MAY 20-24, 1991 CL TUCSON, AZ SP ASSOC CARBON FOURTEEN LABS, PAUL E DAMON, HYDRO GEO CHEM, PACKARD INSTRUMENT, RES CORP, UNIV ARIZONA, US USSR COOPERAT FIELD BASIC SCI RES PROGRAM, WALLAC OY ID ACCELERATOR MASS-SPECTROMETRY; SI-32; TI-44; BONE AB We have performed a new determination of the half-life of Ca-41 by measuring the specific activity of an enriched Ca material with known Ca-41 abundance. We measured the activity via the 3.3-keV X-rays emitted in the electron capture decay of Ca-41, and the Ca-41 abundance was measured by low-energy Mass spectrometry. The result, t1/2 = (1.01 +/-0.10) x 10(5) yr, agrees with the recent 'geological' half-life of Klein et al., (1991), t1/2 = (1.03 +/- 0.07) x 10(5) yr, and with the corrected value of Mabuchi et al. (1974), t1/2 = (1.13 +/- 0.12) x 10(5) yr. We recommend the weighted mean of these three measurements, t1/2 = (1.04 +/- 0.05) x 10(5) yr, as the most probable half-life of Ca-41. We also discuss the situation of the radioisotopes, Si-32, Ti-44, Se-79 and 126Sn, whose half-lives, though still uncertain, are potentially interesting for future AMS studies and other applications. C1 HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. RP KUTSCHERA, W (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 44 TC 5 Z9 7 U1 0 U2 1 PU UNIV ARIZONA DEPT GEOSCIENCES PI TUCSON PA RADIOCARBON 4717 E FORT LOWELL RD, TUCSON, AZ 85712 SN 0033-8222 J9 RADIOCARBON JI Radiocarbon PY 1992 VL 34 IS 3 BP 436 EP 446 PG 11 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KF389 UT WOS:A1992KF38900026 ER PT J AU SOUTHON, JR VOGEL, JS TRUMBORE, SE DAVIS, JC ROBERTS, ML CAFFEE, MW FINKEL, RC PROCTOR, ID HEIKKINEN, DW BERNO, AJ HORNADY, RS AF SOUTHON, JR VOGEL, JS TRUMBORE, SE DAVIS, JC ROBERTS, ML CAFFEE, MW FINKEL, RC PROCTOR, ID HEIKKINEN, DW BERNO, AJ HORNADY, RS TI PROGRESS IN AMS MEASUREMENTS AT THE LLNL SPECTROMETER SO RADIOCARBON LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL RADIOCARBON CONF ( 14C14 ) CY MAY 20-24, 1991 CL TUCSON, AZ SP ASSOC CARBON FOURTEEN LABS, PAUL E DAMON, HYDRO GEO CHEM, PACKARD INSTRUMENT, RES CORP, UNIV ARIZONA, US USSR COOPERAT FIELD BASIC SCI RES PROGRAM, WALLAC OY ID ACCELERATOR MASS-SPECTROMETRY AB We report on the present status of the Lawrence Livermore AMS spectrometer, including sample throughput and progress towards routine 1% measurement capability for C-14, first results on other isotopes and experience with a multisample high-intensity ion source. RP SOUTHON, JR (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR ACCELERATOR MASS SPECTROMETRY,LIVERMORE,CA 94550, USA. RI Trumbore, Susan/B-1948-2013; Caffee, Marc/K-7025-2015 OI Caffee, Marc/0000-0002-6846-8967 NR 5 TC 21 Z9 21 U1 1 U2 2 PU UNIV ARIZONA DEPT GEOSCIENCES PI TUCSON PA RADIOCARBON 4717 E FORT LOWELL RD, TUCSON, AZ 85712 SN 0033-8222 J9 RADIOCARBON JI Radiocarbon PY 1992 VL 34 IS 3 BP 473 EP 477 PG 5 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KF389 UT WOS:A1992KF38900031 ER PT J AU TRUMBORE, SE SCHIFF, SL ARAVENA, R ELGOOD, R AF TRUMBORE, SE SCHIFF, SL ARAVENA, R ELGOOD, R TI SOURCES AND TRANSFORMATION OF DISSOLVED ORGANIC-CARBON IN THE HARP LAKE FORESTED CATCHMENT - THE ROLE OF SOILS SO RADIOCARBON LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL RADIOCARBON CONF ( 14C14 ) CY MAY 20-24, 1991 CL TUCSON, AZ SP ASSOC CARBON FOURTEEN LABS, PAUL E DAMON, HYDRO GEO CHEM, PACKARD INSTRUMENT, RES CORP, UNIV ARIZONA, US USSR COOPERAT FIELD BASIC SCI RES PROGRAM, WALLAC OY ID ISOTOPIC COMPOSITION; CENTRAL ONTARIO; WATERSHEDS; STREAMS; ACIDITY; SYSTEM AB The C-14 content of dissolved organic carbon (DOC) in streams, soil water and groundwaters in the Harp Lake catchment in Ontario, Canada, reflect a mixture of DOC sources, including both contemporary plant material and C-14-depleted soil organic matter. The concentration and isotopic content of DOC in streams is highly variable, reflecting the complex flow path of the source water entering the streams. The characteristics of groundwater DOC are set in the soil column, either through DOC production in the deeper soil layers, or through preferential decomposition and/or sorption of C-14-enriched DOC components from percolating waters. We estimate the relative magnitudes of decomposition, transport and sorption as sinks for DOC produced in forested catchment soils. C1 LAWRENCE LIVERMORE NATL LAB,CTR ACCELERATOR MASS SPECTROMETRY,LIVERMORE,CA 94550. UNIV WATERLOO,CTR GROUNDWATER RES,WATERLOO N2J 3E6,ON,CANADA. RI Trumbore, Susan/B-1948-2013 NR 29 TC 39 Z9 39 U1 4 U2 11 PU UNIV ARIZONA DEPT GEOSCIENCES PI TUCSON PA RADIOCARBON 4717 E FORT LOWELL RD, TUCSON, AZ 85712 SN 0033-8222 J9 RADIOCARBON JI Radiocarbon PY 1992 VL 34 IS 3 BP 626 EP 635 PG 10 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KF389 UT WOS:A1992KF38900051 ER PT J AU ARAVENA, R SCHIFF, SL TRUMBORE, SE DILLON, PJ ELGOOD, R AF ARAVENA, R SCHIFF, SL TRUMBORE, SE DILLON, PJ ELGOOD, R TI EVALUATING DISSOLVED INORGANIC CARBON CYCLING IN A FORESTED LAKE WATERSHED USING CARBON ISOTOPES SO RADIOCARBON LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL RADIOCARBON CONF ( 14C14 ) CY MAY 20-24, 1991 CL TUCSON, AZ SP ASSOC CARBON FOURTEEN LABS, PAUL E DAMON, HYDRO GEO CHEM, PACKARD INSTRUMENT, RES CORP, UNIV ARIZONA, US USSR COOPERAT FIELD BASIC SCI RES PROGRAM, WALLAC OY ID SOIL CO2; HARP LAKE; ONTARIO; C-14; EVOLUTION; DIOXIDE; MODEL AB Dissolved inorganic carbon (DIC) is the main acid buffer in forested lake watersheds in Canada. We used carbon isotopes (C-13, C-14) to evaluate the production and cycling of DIC in an acid-sensitive lake watershed of the Precambrian Shield. Soil CO2, groundwater and stream DIC were characterized chemically and isotopically. Soil CO2 concentration profiles reflect both changes in production and in losses due to diffusion. DeltaC-13 soil CO2 profiles (deltaC-13 values of -23 parts per thousand in summer, slightly enriched during the fall and -25 parts per thousand during the winter) are a reflection of the isotopic composition of the sources and changes in isotopic fractionation due to diffusion. Carbon isotopic composition (C-13, C-14) of the groundwater and stream DIC clearly indicate that weathering of silicates by soil CO2 is the main source of DIC in these watersheds. C-14 data show that, in addition to recent groundwater, an older groundwater component with depleted C-14 activity is also present in the bedrock. The carbon isotope pattern in the groundwater also implies that, besides the main springtime recharge events, contributions to the groundwater may also occur during late winter/early spring. C1 MINIST ENVIRONM,DORSET RES CTR,DORSET P0A 1E0,ON,CANADA. LAWRENCE LIVERMORE NATL LAB,CTR ACCELERATOR MASS SPECTROMETRY,LIVERMORE,CA 94550. RP ARAVENA, R (reprint author), UNIV WATERLOO,WATERLOO CTR GROUNDWATER RES,WATERLOO N2L 3G1,ONTARIO,CANADA. RI Trumbore, Susan/B-1948-2013 NR 32 TC 33 Z9 37 U1 1 U2 12 PU UNIV ARIZONA DEPT GEOSCIENCES PI TUCSON PA RADIOCARBON 4717 E FORT LOWELL RD, TUCSON, AZ 85712 SN 0033-8222 J9 RADIOCARBON JI Radiocarbon PY 1992 VL 34 IS 3 BP 636 EP 645 PG 10 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KF389 UT WOS:A1992KF38900052 ER PT J AU PENG, TH AF PENG, TH TI POSSIBLE EFFECTS OF OZONE DEPLETION ON THE GLOBAL CARBON-CYCLE SO RADIOCARBON LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL RADIOCARBON CONF ( 14C14 ) CY MAY 20-24, 1991 CL TUCSON, AZ SP ASSOC CARBON FOURTEEN LABS, PAUL E DAMON, HYDRO GEO CHEM, PACKARD INSTRUMENT, RES CORP, UNIV ARIZONA, US USSR COOPERAT FIELD BASIC SCI RES PROGRAM, WALLAC OY ID IRON FERTILIZATION; ATMOSPHERIC CO2; OCEAN AB The increase of UV-B radiation resulting from ozone depletion is considered to have damaging effects on marine ecosystems. A cutback of marine productivity would tend to reduce the oceanic uptake of atmospheric CO2. Box models of the global oceans based on the distribution of bomb-produced C-14 are used to evaluate the possible effects of ozone depletion on the atmospheric CO2 concentration. The maximum effect presumably takes place if the ozone hole reduces the marine productivity, to zero in the Antarctic Ocean. In a business-as-usual scenario of future CO2 emissions, the atmospheric CO2 partial pressure (pCO2) would increase by an additional 37 muatm over the course of the next century. This increase corresponds to 4.6% of the projected atmospheric pCO2 in the year 2090. However, if the damaging effect caused by the destruction of the stratospheric ozone layer is assumed to lower the productivity over the Antarctic Ocean by 10%, the atmospheric pCO2 would rise by less than 3 muatm over the expected atmospheric level in the next century. RP PENG, TH (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. NR 22 TC 2 Z9 2 U1 0 U2 3 PU UNIV ARIZONA DEPT GEOSCIENCES PI TUCSON PA RADIOCARBON 4717 E FORT LOWELL RD, TUCSON, AZ 85712 SN 0033-8222 J9 RADIOCARBON JI Radiocarbon PY 1992 VL 34 IS 3 BP 772 EP 779 PG 8 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KF389 UT WOS:A1992KF38900067 ER PT J AU RAI, D FELMY, AR FULTON, RW RYAN, JL AF RAI, D FELMY, AR FULTON, RW RYAN, JL TI AQUEOUS CHEMISTRY OF ND IN BOROSILICATE-GLASS WATER-SYSTEMS SO RADIOCHIMICA ACTA LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON CHEMISTRY AND MIGRATION BEHAVIOR OF ACTINIDES AND FISSION PRODUCTS CY OCT, 1991 CL JEREZ FRONTERA, SPAIN SP COMMISS EUROPEAN COMMUNITIES, EMPRESA NACL RESIDUOS RADIOACTIVOS DE ND; ND(OH3(GL); NDOHCO3(C), ND PHOSPHATE; BOROSILICATE GLASSES; SOLUBILITY; LA; SM; AM; THERMODYNAMICS ID SOLUBILITY; THERMODYNAMICS; ELECTROLYTES; HYDROXIDE; CONSTANTS AB Phosphate and nonphosphate glass suspensions in water were adjusted to a pH range between 1 and 10 and equilibrated in Ar(g) and CO2(g) to determine the specific chemical reactions controlling the aqueous concentrations of Nd. The Nd concentrations in solutions contacting nonphosphate glass equilibrated under Ar(g) and 0.00154 atm CO2(g) were controlled by Nd(OH)3(gl) and NdOHCO3(c), respectively. The Nd concentrations in solutions contacting phosphate glass equilibrated under Ar(g) or 0.001 54 atm CO2(g) at pH values > 5.5 were less-than-or-equal-to 10(-8.5) M and the observed low concentrations, when compared with nonphosphate glass, are the result of an as yet unidentified Nd phosphate compound. The limited data on La, Sm, and Am, as expected, show that their aqueous behavior in these systems is similar to Nd. RP RAI, D (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 17 TC 19 Z9 19 U1 1 U2 2 PU R OLDENBOURG VERLAG PI MUNICH 80 PA ROSENHEIMER STR 145 POSTFACH 801360, W-8000 MUNICH 80, GERMANY SN 0033-8230 J9 RADIOCHIM ACTA JI Radiochim. Acta PY 1992 VL 58-9 BP 9 EP 16 PN 1 PG 8 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA KD612 UT WOS:A1992KD61200003 ER PT J AU NITSCHE, H MULLER, A STANDIFER, EM DEINHAMMER, RS BECRAFT, K PRUSSIN, T GATTI, RC AF NITSCHE, H MULLER, A STANDIFER, EM DEINHAMMER, RS BECRAFT, K PRUSSIN, T GATTI, RC TI DEPENDENCE OF ACTINIDE SOLUBILITY AND SPECIATION ON CARBONATE CONCENTRATION AND IONIC-STRENGTH IN GROUNDWATER SO RADIOCHIMICA ACTA LA English DT Article DE ACTINIDES; NEPTUNIUM; PLUTONIUM; AMERICIUM; SOLUBILITY; GROUNDWATER; NUCLEAR WASTE; RADIOACTIVE WASTE; MIGRATION; FAR FIELD AB Yucca Mountain, Nevada, USA, is being investigated for its potential suitability as a geologic nuclear waste repository. As part of the site characterization studies, actinide solubilities and speciations were studied at pH 6, 7, and 8.5 in two different groundwaters coming from the vicinity of Yucca Mountain. The groundwaters differ substantially in total dissolved carbonate concentration, and to a lesser extent in ionic strength. The solubilities of neptunium(V) decreased, whereas those of americium(III) increased in the water with the higher carbonate content. The solids formed were sodium neptunium carbonates and americium hydroxycarbonates. Plutonium solubilities did not significantly change with changing water composition, because the solubility-controlling solids were mostly amorphous Pu(IV) polymers that contained only small amounts of carbonate. RP NITSCHE, H (reprint author), LAWRENCE BERKELEY LAB, DIV EARTH SCI, 1 CYCLOTRON RD, MAIL STOP 70A-1150, BERKELEY, CA 94720 USA. NR 33 TC 27 Z9 28 U1 0 U2 3 PU WALTER DE GRUYTER GMBH PI BERLIN PA GENTHINER STRASSE 13, D-10785 BERLIN, GERMANY SN 0033-8230 J9 RADIOCHIM ACTA JI Radiochim. Acta PY 1992 VL 58-9 BP 27 EP 32 PN 1 PG 6 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA KD612 UT WOS:A1992KD61200006 ER PT J AU THOMPSON, JL AF THOMPSON, JL TI STUDIES OF FISSION-PRODUCT MOVEMENT IN TUFFACEOUS MEDIA SO RADIOCHIMICA ACTA LA English DT Article DE RADIONUCLIDE MIGRATION; ENVIRONMENTAL EFFECTS OF NUCLEAR TESTING AB In this paper we discuss the results of research on radionuclide movement underground at the Nevada Test Site (NTS). Underground nuclear tests have been conducted here for many years; a substantial number of these tests were at or below the water table. We are studying locations of past tests to determine whether residual fission products are moving through the underground environment and, if so, by what mechanisms. Our research involves consideration of leaching, sorption, hydraulic dispersion, fracture flow and colloid transport. The data we obtain are relevant to groundwater contamination and nuclear waste storage issues. This paper contains information from our research at two different locations within the NTS. At one site we have monitored the movement of tritium and certain fission products with moving groundwater. At the other site dispersal of radioactive material seems to have occurred by means other than groundwater transport. RP THOMPSON, JL (reprint author), LOS ALAMOS NATL LAB,INC-11,MS J514,LOS ALAMOS,NM 87545, USA. NR 16 TC 1 Z9 1 U1 0 U2 1 PU R OLDENBOURG VERLAG PI MUNICH 80 PA ROSENHEIMER STR 145 POSTFACH 801360, W-8000 MUNICH 80, GERMANY SN 0033-8230 J9 RADIOCHIM ACTA JI Radiochim. Acta PY 1992 VL 58-9 BP 273 EP 276 PN 2 PG 4 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA KD613 UT WOS:A1992KD61300010 ER PT J AU BRAINARD, JR STRIETELMEIER, BA SMITH, PH LANGSTONUNKEFER, PJ BARR, ME RYAN, RR AF BRAINARD, JR STRIETELMEIER, BA SMITH, PH LANGSTONUNKEFER, PJ BARR, ME RYAN, RR TI ACTINIDE BINDING AND SOLUBILIZATION BY MICROBIAL SIDEROPHORES SO RADIOCHIMICA ACTA LA English DT Article DE ACTINIDE MIGRATION; ACTINIDE DECONTAMINATION; MICROBIAL CHELATORS ID HYDROXAMATE SIDEROPHORES; SEQUESTERING AGENTS; CHELATING-AGENTS; IRON; CHEMISTRY; COMPLEXATION; DISSOLUTION; PLUTONIUM; LIGANDS; OXIDES AB Accurate predictions of actinide and fission product migration in the geosphere are critically dependent on identification of the biological, chemical and physical processes which affect actinide mobility in soil and water. Siderophores are low molecular weight iron chelators produced by microbes in response to low availability of soluble iron. Because of the similarities between iron(III) and tetravalent actinides, and the prevalence of siderophore-producing microbes in soil, there is strong likelihood that siderophores may also bind actinides, thereby influencing their mobility in the environment. In order to begin to assess the potential importance of siderophore-mediated actinide mobility, we have determined rate constants for solubilization of hydrous plutonium oxide by the siderophores enterobactin and desferrioxamine B and selected carboxylate, amino polycarboxylate, and catecholate ligands. The measured rate constants for solubilization of insoluble actinide oxides show that siderophores are extremely effective in solubilizing actinides; on a per molecule basis, enterobactin is approximately 10(3) times more effective than the other chelators tested in increasing the rate of solubilization of hydrous plutonium oxide. Notably, ferric-siderophore complexes are more effective in solubilizing actinide oxides than the siderophores in the absence of iron. These results suggest that siderophores have the potential to mobilize actinides in the environment. RP BRAINARD, JR (reprint author), LOS ALAMOS NATL LAB,ENVIRONM CHEM SECT,INC-1,MAIL STOP C346,LOS ALAMOS,NM 87545, USA. NR 30 TC 86 Z9 86 U1 4 U2 24 PU R OLDENBOURG VERLAG PI MUNICH 80 PA ROSENHEIMER STR 145 POSTFACH 801360, W-8000 MUNICH 80, GERMANY SN 0033-8230 J9 RADIOCHIM ACTA JI Radiochim. Acta PY 1992 VL 58-9 BP 357 EP 363 PN 2 PG 7 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA KD613 UT WOS:A1992KD61300025 ER PT J AU ATTREP, M ROENSCH, FR AGUILAR, R FABRYKAMARTIN, J AF ATTREP, M ROENSCH, FR AGUILAR, R FABRYKAMARTIN, J TI SEPARATION AND PURIFICATION OF PLUTONIUM IN URANIUM ORES FOR MASS-SPECTROMETRIC MEASUREMENT SO RADIOCHIMICA ACTA LA English DT Article DE PLUTONIUM; PU IN URANIUM ORES; LOW-LEVEL ANALYSIS OF PU; NATURAL PU AB A method is described for the determination of very low levels of plutonium in uranium ores. Naturally-produced Pu-239 in uranium-bearing rock was measured mass spectrometrically at levels of 10(8) atoms per sample. Clean-room protocol and ultra-clean equipment and reagents are required for the determination. The results of these analyses indicate the feasibility of using naturally-produced Pu-239 to assess the geochemical behavior of plutonium over long time periods. RP ATTREP, M (reprint author), LOS ALAMOS NATL LAB,MAIL STOP J514,LOS ALAMOS,NM 87545, USA. NR 11 TC 7 Z9 7 U1 0 U2 0 PU R OLDENBOURG VERLAG PI MUNICH 80 PA ROSENHEIMER STR 145 POSTFACH 801360, W-8000 MUNICH 80, GERMANY SN 0033-8230 J9 RADIOCHIM ACTA JI Radiochim. Acta PY 1992 VL 57 IS 1 BP 15 EP 20 PG 6 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA JT297 UT WOS:A1992JT29700004 ER PT J AU GOBER, MK KRATZ, JV ZIMMERMANN, HP SCHADEL, M BRUCHLE, W SCHIMPF, E GREGORICH, KE TURLER, A HANNINK, NJ CZERWINSKI, KR KADKHODAYAN, B LEE, DM NURMIA, MJ HOFFMAN, DC GAGGELER, H JOST, D KOVACS, J CHERER, UW WEBER, A AF GOBER, MK KRATZ, JV ZIMMERMANN, HP SCHADEL, M BRUCHLE, W SCHIMPF, E GREGORICH, KE TURLER, A HANNINK, NJ CZERWINSKI, KR KADKHODAYAN, B LEE, DM NURMIA, MJ HOFFMAN, DC GAGGELER, H JOST, D KOVACS, J CHERER, UW WEBER, A TI CHEMICAL-PROPERTIES OF ELEMENT-105 IN AQUEOUS-SOLUTION - EXTRACTIONS INTO DIISOBUTYLCARBINOL SO RADIOCHIMICA ACTA LA English DT Article DE ELEMENT-105; CHEMICAL PROPERTIES; HALIDE COMPLEX; FORMATION; EXTRACTION INTO A SECONDARY ALCOHOL AB Studies of the extraction of element 105 into diisobutylcarbinol (DIBC) from aqueous HBr and HCI solutions were performed on 262Ha and 263Ha produced in the (Bk(O,5n))-Bk-249-I-18 and (Bk(O,4n))-Bk-249-O-18 reactions at a beam energy of 99 MeV. The Ha isotopes were detected by measuring the fission and alpha activities associated with their decay and the alpha-decays of their daughters, 4-s 258Lr and 6-s 259Lr. Complete extraction-elution cycles were performed on a one-minute time scale by the computer-controlled liquid chromatography apparatus, ARCA II, using reversed phase micro-chromatographic columns incorporating DIBC on an inert support. Stimulated by the previously observed similarity of the aqueous-phase chemistry of element 105 to that of niobium and protactinium, the extraction, from concentrated HBr, was followed by the elution of a Nb fraction in 6 M HCl/0.0002 M HF, and a Pa fraction in 0.5 M HCl. The number of 262,263Ha decays observed in the Nb fraction indicated that less than 45% of the Ha was extracted into DIBC from concentrated HBr. This was confirmed in a series of experiments in which, after the extraction, the DIBC along with all extracted species was stripped from the columns with acetone. It is concluded that, in the present chemical system, the extraction behaviour of element 105 is closer to that of niobium than to that of protactinium. The decreasing extractability from HBr (Pa > Nb > Ha) is likely to be due to an increasing tendency of these elements to form non-extractable polynegative complex species in concentrated HBr in the sequence Pa < Nb < Ha. C1 GESELL SCHWERIONENFORSCH GMBH,W-6100 DARMSTADT,GERMANY. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. PAUL SCHERRER INST,CH-5232 VILLIGEN,SWITZERLAND. RP GOBER, MK (reprint author), UNIV MAINZ,INST KERNCHEM,W-6500 MAINZ,GERMANY. RI Turler, Andreas/D-3913-2014 OI Turler, Andreas/0000-0002-4274-1056 NR 16 TC 30 Z9 31 U1 1 U2 4 PU R OLDENBOURG VERLAG PI MUNICH 80 PA ROSENHEIMER STR 145 POSTFACH 801360, W-8000 MUNICH 80, GERMANY SN 0033-8230 J9 RADIOCHIM ACTA JI Radiochim. Acta PY 1992 VL 57 IS 2-3 BP 77 EP 84 PG 8 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA JZ221 UT WOS:A1992JZ22100004 ER PT J AU SCHADEL, M BRUCHLE, W SCHIMPF, E ZIMMERMANN, HP GOBER, MK KRATZ, JV TRAUTMANN, N GAGGELER, H JOST, D KOVACS, J SCHERER, UW WEBER, A GREGORICH, KE TURLER, A CZERWINSKI, KR HANNINK, NJ KADKHODAYAN, B LEE, DM NURMIA, MJ HOFFMAN, DC AF SCHADEL, M BRUCHLE, W SCHIMPF, E ZIMMERMANN, HP GOBER, MK KRATZ, JV TRAUTMANN, N GAGGELER, H JOST, D KOVACS, J SCHERER, UW WEBER, A GREGORICH, KE TURLER, A CZERWINSKI, KR HANNINK, NJ KADKHODAYAN, B LEE, DM NURMIA, MJ HOFFMAN, DC TI CHEMICAL-PROPERTIES OF ELEMENT-105 IN AQUEOUS-SOLUTION - CATION-EXCHANGE SEPARATIONS WITH ALPHA-HYDROXYISOBUTYRIC ACID SO RADIOCHIMICA ACTA LA English DT Article DE ELEMENT-105; CHEMICAL PROPERTIES; COMPLEXATION WITH ALPHA-HYDROXYISOBUTYRATE; PENTAVALENT OXIDATION STATE; NUCLEAR DECAY OF HA262,263 ID CHEMISTRY AB Studies of the complexation of element 105 by unbuffered alpha-hydroxyisobutyric acid (alpha-HiB) and its elution from strongly acidic cation exchange resin were performed on a mixture of 34-S 262Ha and 27-S 263Ha produced in the (Bk(O,5n))Bk-249-O-18 and (Bk(O,4n))-Bk-249-O-18 reactions at a beam energy of 99 MeV. The Ha isotopes were detected by measuring the spontaneous fission and alpha-activities associated with their decay, and the alpha-decays of their daughters, 4-s 258Lr, and 6-S 259Lr. Time-correlated pairs of parent and daughter alpha-particles were also registered. The experiments were performed on a one-minute time scale with the computer-controlled liquid chromatography system ARCA II. In 0.05 M alpha-HiB, element 105 was found to be eluted within 4 s from 1.6 x 8 mm columns together, with the pentavalent Nb-, Ta-, and Pa-ions, while tetravalent Zr- and trivalent Eu-ions were strongly retained on the columns. This is independent proof that the most stable oxidation state of element 105 in aqueous solution is +5. This very efficient separation of 262,263Ha was also used, for the first time, to demonstrate that their alpha- and spontaneous fission decays can be registered from a almost-equal-to 23 mum thin aqueous layer in contact with a large-area passivated ion-implanted planar silicon detector. In addition, the alpha-HiB separations were instrumental in the successful identification of the hitherto undiscovered isotope 263Ha produced at an O-18 beam energy of 93 MeV. C1 UNIV MAINZ,INST KERNCHEM,W-6500 MAINZ,GERMANY. PAUL SCHERRER INST,CH-5232 VILLIGEN,SWITZERLAND. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP SCHADEL, M (reprint author), GESELL SCHWERIONENFORSCH GMBH,W-6100 DARMSTADT,GERMANY. RI Turler, Andreas/D-3913-2014 OI Turler, Andreas/0000-0002-4274-1056 NR 26 TC 40 Z9 41 U1 0 U2 4 PU R OLDENBOURG VERLAG PI MUNICH 80 PA ROSENHEIMER STR 145 POSTFACH 801360, W-8000 MUNICH 80, GERMANY SN 0033-8230 J9 RADIOCHIM ACTA JI Radiochim. Acta PY 1992 VL 57 IS 2-3 BP 85 EP 92 PG 8 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA JZ221 UT WOS:A1992JZ22100005 ER PT J AU GAGGELER, HW JOST, DT KOVACS, J SCHERER, UW WEBER, A VERMEULEN, D TURLER, A GREGORICH, KE HENDERSON, RA CZERWINSKI, KR KADKHODAYAN, B LEE, DM NURMIA, M HOFFMAN, DC KRATZ, JV GOBER, MK ZIMMERMANN, HP SCHADEL, M BRUCHLE, W SCHIMPF, E ZVARA, I AF GAGGELER, HW JOST, DT KOVACS, J SCHERER, UW WEBER, A VERMEULEN, D TURLER, A GREGORICH, KE HENDERSON, RA CZERWINSKI, KR KADKHODAYAN, B LEE, DM NURMIA, M HOFFMAN, DC KRATZ, JV GOBER, MK ZIMMERMANN, HP SCHADEL, M BRUCHLE, W SCHIMPF, E ZVARA, I TI GAS-PHASE CHROMATOGRAPHY EXPERIMENTS WITH BROMIDES OF TANTALUM AND ELEMENT-105 SO RADIOCHIMICA ACTA LA English DT Article DE ELEMENT-105; TRANSITION METAL GROUP-V; CHEMICAL PROPERTIES; BROMIDES; VOLATILITY; GAS CHROMATOGRAPHY ID CHEMISTRY; SYSTEM; KURCHATOVIUM; SEPARATION; JET AB The retention behavior of volatile bromide molecules of short-lived isotopes of tantalum and element 105 in KCl coated quartz columns was studied using continuous isothermal gas chromatography. HBr and HBr saturated with BBr3 vapor were used as reactive gases. The isotopes were produced in the fusion reactions Ne-20 + (nat.)Eu and O-18 + Bk-249, respectively. The reaction products were transported from the accelerator to the chromatography set-up with a gas-jet system using an aerosol with He as carrier gas and KCl as transporting particles. The measured retention times are compared to those of 99gNb bromides from a previous study. The retention times of niobium and tantalum bromides at very similar, in agreement with expectations based on the nearly identical sublimation enthalpies of NbBr5 and TaBr5. For the bromides of element 105, higher retention times are found, indicating a lower volatility of 105Br5 than of NbBr5 and TaBr5. On the basis of empirical systematics, a sublimation enthalpy of 138 +/- 15 kJ/mol can be estimated for 105Br5 from the experimental data. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV MAINZ,INST KERNCHEM,W-6500 MAINZ,GERMANY. GESELL SCHWERIONENFORSCH GMBH,W-6100 DARMSTADT,GERMANY. DUBNA JOINT NUCL RES INST,DUBNA,USSR. RP GAGGELER, HW (reprint author), PAUL SCHERRER INST,CH-5232 VILLIGEN,SWITZERLAND. RI Turler, Andreas/D-3913-2014 OI Turler, Andreas/0000-0002-4274-1056 NR 44 TC 52 Z9 55 U1 1 U2 2 PU R OLDENBOURG VERLAG PI MUNICH 80 PA ROSENHEIMER STR 145 POSTFACH 801360, W-8000 MUNICH 80, GERMANY SN 0033-8230 J9 RADIOCHIM ACTA JI Radiochim. Acta PY 1992 VL 57 IS 2-3 BP 93 EP 100 PG 8 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA JZ221 UT WOS:A1992JZ22100006 ER PT J AU CHOPPIN, GR RAO, LF RIZKALLA, EN SULLIVAN, JC AF CHOPPIN, GR RAO, LF RIZKALLA, EN SULLIVAN, JC TI CALORIMETRIC STUDIES OF NEPTUNIUM(V) COMPLEXATION BY POLYCARBOXYLATE LIGANDS SO RADIOCHIMICA ACTA LA English DT Article DE NEPTUNIUM(V); CALORIMETRY; CARBOXYLATES; COMPLEXATION; ACTINIDES ID AMINO CARBOXYLATES; ACTINIDES AB The enthalpies of formation of the 1:1 complexes of NpO2+ with alpha-picolinate, dipicolinate, iminodiacetate, nitrilotriacetate, oxydiacetate, and thiodiacetate ligands were determined by titration calorimetry. The order of interaction with the non-carboxylate donor is N > O much greater than S. The lack of attraction to the thio group results in interaction with only one carboxylate group of the thiodiacetate ligand. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP CHOPPIN, GR (reprint author), FLORIDA STATE UNIV,DEPT CHEM,TALLAHASSEE,FL 32306, USA. NR 15 TC 12 Z9 12 U1 2 U2 3 PU R OLDENBOURG VERLAG PI MUNICH 80 PA ROSENHEIMER STR 145 POSTFACH 801360, W-8000 MUNICH 80, GERMANY SN 0033-8230 J9 RADIOCHIM ACTA JI Radiochim. Acta PY 1992 VL 57 IS 4 BP 173 EP 175 PG 3 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA KB581 UT WOS:A1992KB58100002 ER PT J AU PIPPIN, CG SULLIVAN, JC MEISEL, D CHOPPIN, GR AF PIPPIN, CG SULLIVAN, JC MEISEL, D CHOPPIN, GR TI KINETICS OF URANIUM(VI) REDUCTION IN AQUEOUS POLYELECTROLYTE SYSTEMS SO RADIOCHIMICA ACTA LA English DT Article DE URANIUM; POLYELECTROLYTES; ACTINIDES; KINETICS ID HUMIC-ACID; STABILITY; BEHAVIOR; URANYL AB The reduction of uranyl(VI) to uranyl(V) by viologen radical anions in the presence of polyelectrolytes was studied using a linear electron accelerator to produce the viologen radicals. The rate constant for the reduction of U(VI) when it was complexed by polyvinylsulfate (PVS) was about 20 times less than when it was present as the aquated cation. When the U(VI) was complexed by acetate, the reduction rate constant was somewhat smaller than for the aquated cation, but they were more than 200 times smaller for the polyacrylic (PAA) and polymaleic (PMA) acid complexes of U(VI). The trends in the rate constants for reduction by the polyelectrolyte complexes is interpreted in terms of the number of cations per macromolecule and the associated effects of polymer charge and conformation on the reduction. C1 FLORIDA STATE UNIV,DEPT CHEM,TALLAHASSEE,FL 32306. RP PIPPIN, CG (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 25 TC 5 Z9 5 U1 0 U2 0 PU R OLDENBOURG VERLAG PI MUNICH 80 PA ROSENHEIMER STR 145 POSTFACH 801360, W-8000 MUNICH 80, GERMANY SN 0033-8230 J9 RADIOCHIM ACTA JI Radiochim. Acta PY 1992 VL 57 IS 4 BP 177 EP 183 PG 7 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA KB581 UT WOS:A1992KB58100003 ER PT J AU MIRZADEH, S KNAPP, FF AF MIRZADEH, S KNAPP, FF TI SPONTANEOUS ELECTROCHEMICAL SEPARATION OF CARRIER-FREE COPPER-64 AND COPPER-67 FROM ZINC TARGETS SO RADIOCHIMICA ACTA LA English DT Article DE ELECTROCHEMICAL SEPARATION; CARRIER-FREE CU-67; RADIOISOTOPE PRODUCTION AND RADIOCHEMISTRY ID CHEMISTRY; CU-67; RADIONUCLIDES; POLONIUM; LEVEL; ATOMS; MICE AB Electrochemical processes are attractive techniques for the separation of electropositive metal ions. In this paper, we describe the first application of the spontaneous electrodeposition technique for the separation of carrier-free radioisotopes of copper from proton- or neutron-irradiated zinc targets. The unique feature of this process is the deposition of copper on the Pt electrode without the requirement of an external electromotive force (EMF). The deposited radioactivity is then easily removed from the electrode material yielding highly pure preparations of carrier-free Cu-64 or Cu-67. Separation factors which have been achieved exceed those reported for other processes. The process is intrinsically simple with a minimum of manipulation and therefore amenable to automation and remote processing. The deposition process was found to be rather insensitive to the concentrations of ZnSO4 and H2SO4. The evaluation of the kinetics of the electrodeposition of carrier-free Cu-67 yielded a deposition velocity of (1.50 +/- 0.27) x 10(-1) min-1 corresponding to a deposition constant of approximately 0.77 cm . min-1. Under our experimental conditions, the deposition process was found to be largely irreversible. From the temperature dependence of the deposition velocity constants, an activation energy of 0.18 +/- 0.03 eV was calculated. Furthermore, it appears that the thermodynamic spontaneity is satisfied at all concentrations of copper ions. RP MIRZADEH, S (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,NUCL MED GRP,OAK RIDGE,TN 37831, USA. NR 27 TC 19 Z9 19 U1 1 U2 5 PU R OLDENBOURG VERLAG PI MUNICH 80 PA ROSENHEIMER STR 145 POSTFACH 801360, W-8000 MUNICH 80, GERMANY SN 0033-8230 J9 RADIOCHIM ACTA JI Radiochim. Acta PY 1992 VL 57 IS 4 BP 193 EP 199 PG 7 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA KB581 UT WOS:A1992KB58100005 ER PT J AU KADKHODAYAN, B HENDERSON, RA HALL, HL LEYBA, JD CZERWINSKI, KR KREEK, SA HANNINK, NJ GREGORICH, KE LEE, DM NURMIA, MJ HOFFMAN, DC AF KADKHODAYAN, B HENDERSON, RA HALL, HL LEYBA, JD CZERWINSKI, KR KREEK, SA HANNINK, NJ GREGORICH, KE LEE, DM NURMIA, MJ HOFFMAN, DC TI IDENTIFICATION OF MD-253 SO RADIOCHIMICA ACTA LA English DT Article DE MD-253; ALPHA-HYDROXYISOBUTYRATE; ION-EXCHANGE; HALF-LIFE ID ELEMENTS; TARGETS AB We have measured the half-life and production cross section of the new isotope Md-253, produced via the Am-243(C-13,3n) reaction. Isolation of Md from other activities was accomplished using elution with ammonium alpha-hydroxyisobutyrate from a cation exchange resin column. Experiments were performed with different irradiation time intervals, but the chemical separation always began and ended at exactly the same length of time after the end of irradiation. All separations with the same irradiation lengths were combined and analyzed for growth and decay of the 3.0-d Fm-253 daughter and 20.47-d Es-253, granddaughter of Md-253. The amount of Es-253 in each fraction depends on the length of each irradiation and the Md-253 half-life. An increase in the length of irradiation will cause a corresponding increase in the amount of the new isotope Md-253 and hence, in the amount of Es-253 produced, provided the length of irradiations are not very long compared to the half-life of Md-253. In this way, the Md half-life was estimated to be about 6 minutes with a production cross section of the order of 50 nb. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP KADKHODAYAN, B (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. OI Hall, Howard/0000-0002-4080-5159 NR 17 TC 5 Z9 5 U1 1 U2 3 PU R OLDENBOURG VERLAG PI MUNICH 80 PA ROSENHEIMER STR 145 POSTFACH 801360, W-8000 MUNICH 80, GERMANY SN 0033-8230 J9 RADIOCHIM ACTA JI Radiochim. Acta PY 1992 VL 56 IS 1 BP 1 EP 5 PG 5 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA HD128 UT WOS:A1992HD12800001 ER PT J AU RAI, D FELMY, AR FULTON, RW AF RAI, D FELMY, AR FULTON, RW TI SOLUBILITY AND ION ACTIVITY PRODUCT OF AMPO4.XH2O(AM) SO RADIOCHIMICA ACTA LA English DT Article DE SOLUBILITY; AQUEOUS THERMODYNAMICS; AMPO4.XH2O(AM); AMERICIUM; PHOSPHATE ID HYDROLYSIS CONSTANTS; THERMODYNAMICS; ELECTROLYTES; HYDROXIDE AB In this study, the compound that readily precipitated from dilute acidic solutions of Am and phosphate was characterized as AmPO4.xH2O(am) and found to be stable for periods exceeding 86 days. The solubility of this compound was studied from both the over- and the undersaturation directions, with hydrogen ion concentration (pc(H+)) ranging from 1 to 10, phosphate concentration ranging from 10(-3) to 10(-5.2) M, and equilibration period ranging from 8 to 105 days. Equilibrium in most cases was reached in < 21 days. Only in the low-pc(H+) region (1 to 3), where Am solubility decreased as pc(H+) increased, was AmPO4.xH2O(am) found to be appreciably soluble. At pc(H+) values between 3.5 and 10, the solubility of AmPO4.xH2O(am) was found to be very low (less-than-or-equal-to 10(-8.5) M), and the observed solubilities appeared to be independent of pc(H+). From the H+, Am, and phosphate concentrations in the equilibrated solutions in the low-pc(H+) region, the logarithm of the thermodynamic equilibrium constant for the reaction AmPO4.xH2O(am) reversible Am3+ + PO43- + xH2O was calculated to be -24.79 +/- 0.18. RP RAI, D (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 17 TC 28 Z9 28 U1 2 U2 8 PU R OLDENBOURG VERLAG PI MUNICH 80 PA ROSENHEIMER STR 145 POSTFACH 801360, W-8000 MUNICH 80, GERMANY SN 0033-8230 J9 RADIOCHIM ACTA JI Radiochim. Acta PY 1992 VL 56 IS 1 BP 7 EP 14 PG 8 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA HD128 UT WOS:A1992HD12800002 ER PT J AU BENNETT, DA HOFFMAN, D NITSCHE, H RUSSO, RE TORRES, RA BAISDEN, PA ANDREWS, JE PALMER, CEA SILVA, RJ AF BENNETT, DA HOFFMAN, D NITSCHE, H RUSSO, RE TORRES, RA BAISDEN, PA ANDREWS, JE PALMER, CEA SILVA, RJ TI HYDROLYSIS AND CARBONATE COMPLEXATION OF DIOXOPLUTONIUM(V) SO RADIOCHIMICA ACTA LA English DT Article DE PLUTONIUM(V); HYDROLYSIS; CARBONATE COMPLEXATION; LASER-INDUCED PHOTOACOUSTIC SPECTROSCOPY; SPECIFIC ION INTERACTION THEORY (SIT) ID SPECIATION AB The formation constants for the reactions PuO2+ + H2O <--> PuO2(OH) + H+ and PuO2+ + CO32- <--> PuO2(CO3)- were determined in aqueous sodium perchlorate solutions by laser-induced photoacoustic spectroscopy. The molar absorptivity of the PuO2+ band at 569 nm decreased with increasing hydroxide concentration. Similarly, spectral changes occurred between 540 and 580 nm as the carbonate concentration was increased. The absorption data were analyzed by the non-linear least-squares program SQUAD to yield complexation constants. For the hydrolysis reaction at 0.1 M ionic strength, log*beta(11)(0.1) = -9.73 +/- 0.10, and for the first carbonate complexation constant at 0.5 M ionic strength, log-beta(11)(0.5) = 4.60 +/- 0.03. Using the specific ion interaction theory, both complexation constants were extrapolated to zero ionic strength: for hydrolysis, log*beta(11)(0) = -9.73 +/- 0.10, and for carbonate complexation, log-beta(11)(0) = 5.12 +/- 0.07. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV APPL SCI,BERKELEY,CA 94720. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV NUCL CHEM,LIVERMORE,CA 94550. NR 32 TC 22 Z9 22 U1 0 U2 1 PU R OLDENBOURG VERLAG PI MUNICH 80 PA ROSENHEIMER STR 145 POSTFACH 801360, W-8000 MUNICH 80, GERMANY SN 0033-8230 J9 RADIOCHIM ACTA JI Radiochim. Acta PY 1992 VL 56 IS 1 BP 15 EP 19 PG 5 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA HD128 UT WOS:A1992HD12800003 ER PT J AU GHIORSO, A SEABORG, GT AF GHIORSO, A SEABORG, GT TI COMMENTS ON THE SELECTIVE HISTORY AND ANALYSIS OF THE DISCOVERY OF ELEMENT-102 SO RADIOCHIMICA ACTA LA English DT Editorial Material RP GHIORSO, A (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU R OLDENBOURG VERLAG PI MUNICH 80 PA ROSENHEIMER STR 145 POSTFACH 801360, W-8000 MUNICH 80, GERMANY SN 0033-8230 J9 RADIOCHIM ACTA JI Radiochim. Acta PY 1992 VL 56 IS 3 BP 125 EP 125 PG 1 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA JE371 UT WOS:A1992JE37100002 ER PT J AU HO, PC AF HO, PC TI SORPTION OF CESIUM, STRONTIUM, AND TECHNETIUM ONTO ORGANIC-EXTRACTED SHALES SO RADIOCHIMICA ACTA LA English DT Article DE SHALES; RADIONUCLIDES; SORPTION; INTERACTION AB The sorption of Cs(I), Sr(II), and Tc(VII) onto organic-extracted shales from synthetic brine groundwaters and from 0.03-M NaHCO3 solution under oxic conditions at room temperature has been studied. The shale samples used in this study were Pumpkin Valley, Upper Dowelltown, Pierre, and Green River Formation Shales. The organic content of these shales ranges from less than 2 wt% to 13 wt%. Soxhlet extraction with chloroform and a mixture of chloroform and methanol removed 0.07 to 5.9 wt% of the total organic matter from these shales. In comparison with the results of sorption of these three metal ions onto the corresponding untreated shales, it was observed that there were moderate to significant sorption decreases of Cs(I) and Sr(II) on all four organic-extracted shale samples and moderate sorption decreases of Tc(VII) on the organic-extracted Pumpkin Valley, Pierre, and Green River Shale samples, but only moderate sorption increases of Tc(VII) on the organic-extracted Upper Dowelltown Shale samples from the brine groundwaters. Nevertheless, sorption of Cs(I), Sr(II), and Tc(VII) on all four organic-extracted shale samples from the bicarbonate solution in most cases did not show a consistent pattern. RP HO, PC (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831, USA. NR 17 TC 1 Z9 1 U1 0 U2 0 PU R OLDENBOURG VERLAG PI MUNICH 80 PA ROSENHEIMER STR 145 POSTFACH 801360, W-8000 MUNICH 80, GERMANY SN 0033-8230 J9 RADIOCHIM ACTA JI Radiochim. Acta PY 1992 VL 56 IS 3 BP 159 EP 166 PG 8 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA JE371 UT WOS:A1992JE37100007 ER PT J AU FIROUZBAKHT, ML SCHLYER, DJ WOLF, AP AF FIROUZBAKHT, ML SCHLYER, DJ WOLF, AP TI PRODUCTION OF I-123 FROM XENON-124 - CROSS-SECTION AND YIELDS SO RADIOCHIMICA ACTA LA English DT Article DE I-123 PRODUCTION; NUCLEAR CROSS-SECTIONS; PROTON REACTIONS; XENON-124 ID HIGH-PURITY I-123; EXCITATION-FUNCTIONS; PROTON AB The production of high purity I-123 from Xe-124 has been investigated using natural, 20% enriched, 40% enriched and 99.9% enriched xenon at proton energies below 34 MeV. The total cross-section for the production of 1-123 from the 124Xe(p,pn)123Xe --> I-123 and 124Xe(p,2n)123Cs -->123Xe --> I-123 nuclear reactions was found to be insensitive to the isotopic enrichment of the xenon gas. Three experiments were carried out using a target which allowed degradation of the beam energy by 3.5, 3.4 and 2.5 MeV to ensure that the measured yield accurately reflected that predicted from our yield data. RP FIROUZBAKHT, ML (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 32 TC 5 Z9 6 U1 0 U2 0 PU R OLDENBOURG VERLAG PI MUNICH 80 PA ROSENHEIMER STR 145 POSTFACH 801360, W-8000 MUNICH 80, GERMANY SN 0033-8230 J9 RADIOCHIM ACTA JI Radiochim. Acta PY 1992 VL 56 IS 4 BP 167 EP 171 PG 5 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA JJ286 UT WOS:A1992JJ28600001 ER PT J AU MINAI, Y CHOPPIN, GR SISSON, DH AF MINAI, Y CHOPPIN, GR SISSON, DH TI HUMIC MATERIAL IN WELL WATER FROM THE NEVADA TEST SITE SO RADIOCHIMICA ACTA LA English DT Article DE HUMICS; AMERICIUM; COMPLEXES; NMR; SPECIATION ID ACID AB Humic material was isolated from the J-13 well at the Nevada site. Visible and infrared spectroscopy as well as solid state C-13 NMR spectroscopy were used to characterize the humic and fulvic acids samples. These spectra corresponded to those expected for lower molecular weight humic material of aquatic origin. The carboxylate group concentration was determined to be 2.7 and 4.6 meq per g for the fulvic and humic acid fractions, respectively. The binding constants of these fractions for Am+3 were found to be similar to those of other aquatic humic materials. From these binding constants, it was estimated that the Am-humate complex could be a significant species in such waters. C1 LAWRENCE LIVERMORE NATL LAB,DIV NUCL CHEM,LIVERMORE,CA 94550. RP MINAI, Y (reprint author), FLORIDA STATE UNIV,DEPT CHEM,TALLAHASSEE,FL 32306, USA. NR 14 TC 16 Z9 16 U1 0 U2 2 PU R OLDENBOURG VERLAG PI MUNICH 80 PA ROSENHEIMER STR 145 POSTFACH 801360, W-8000 MUNICH 80, GERMANY SN 0033-8230 J9 RADIOCHIM ACTA JI Radiochim. Acta PY 1992 VL 56 IS 4 BP 195 EP 199 PG 5 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA JJ286 UT WOS:A1992JJ28600006 ER PT J AU GERTMAN, DI AF GERTMAN, DI TI CONVERSION OF A MAINFRAME SIMULATION FOR MAINTENANCE PERFORMANCE TO A PC ENVIRONMENT SO RELIABILITY ENGINEERING & SYSTEM SAFETY LA English DT Article AB This paper presents a brief review of a mainframe version of a computer code for simulating maintenance crew performance and introduces advantages realized with the recent implementation of a personal computer (PC) version. The basic computer model-the maintenance personnel performance simulation (MAPPS)-has been developed and validated by the US nuclear Regulatory Commission (NRC) in order to improve maintenance practices and procedures at nuclear power plants. The simulation model is stochastically based, and users are able to model 2 to 15 person crews. Maintenance crew performance is varied as a function of task, environment, and personnel factors. MAPPS produces human error probabilities (HEPs) suitable for use in probabilistic risk assessments. These HEPs are also a potentially important source of information for risk management data bases such as the NRC sponsored Nuclear Computerized Library for Assessing Reactor Reliability (NUCLARR). RP GERTMAN, DI (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,HUMAN FACTORS RES UNIT,POB 1625,IDAHO FALLS,ID 83415, USA. NR 19 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0951-8320 J9 RELIAB ENG SYST SAFE JI Reliab. Eng. Syst. Saf. PY 1992 VL 38 IS 3 BP 211 EP 217 DI 10.1016/0951-8320(92)90134-7 PG 7 WC Engineering, Industrial; Operations Research & Management Science SC Engineering; Operations Research & Management Science GA JY828 UT WOS:A1992JY82800001 ER PT J AU PHAM, H AF PHAM, H TI RELIABILITY-ANALYSIS OF A HIGH-VOLTAGE SYSTEM WITH DEPENDENT FAILURES AND IMPERFECT COVERAGE SO RELIABILITY ENGINEERING & SYSTEM SAFETY LA English DT Article AB Nearly all models concerned with the reliability of redundant systems assume that a failed component does not affect the other working components. This assumption does not apply to many nuclear power systems. In this paper, a high voltage (HV) system consisting of a power supply and two transmitters is considered. We treat the more realistic case of stochastic dependence in the sense that, caused by the failure of a component (transmitter), the failure rate of the working component increases. A model of the HV system as well as a detailed development of the reliability function of this system are presented. The mean time to failure of the HV system is also obtained. A numerical example is provided to illustrate the results. RP PHAM, H (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 9 TC 17 Z9 17 U1 0 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0951-8320 J9 RELIAB ENG SYST SAFE JI Reliab. Eng. Syst. Saf. PY 1992 VL 37 IS 1 BP 25 EP 28 DI 10.1016/0951-8320(92)90054-O PG 4 WC Engineering, Industrial; Operations Research & Management Science SC Engineering; Operations Research & Management Science GA HP772 UT WOS:A1992HP77200004 ER PT J AU PHAM, H GALYEAN, WJ AF PHAM, H GALYEAN, WJ TI RELIABILITY-ANALYSIS OF NUCLEAR FAIL-SAFE REDUNDANCY SO RELIABILITY ENGINEERING & SYSTEM SAFETY LA English DT Article AB In many critical nuclear safety system applications, fault tolerance has been.an essential design attribute for achieving high reliability. Generally, operating systems cannot achieve the intended reliability without employing redundancy. Redundant systems, however, require additional resources in terms of both labor and materials. Therefore, the redundancy level needed to achieve fault tolerance must be carefully determined by balancing the reliability and the cost of the sytems. In this paper, the optimization problem is formulated and solved for the minimum average total cost of nuclear fail-safe systems. We also determine the optimal system size which minimizes the average total system cost subject to a restricted type I design error. Application and numerical examples are given to illustrate the results. RP PHAM, H (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,M-S 2406,IDAHO FALLS,ID 83415, USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0951-8320 J9 RELIAB ENG SYST SAFE JI Reliab. Eng. Syst. Saf. PY 1992 VL 37 IS 2 BP 109 EP 112 DI 10.1016/0951-8320(92)90003-4 PG 4 WC Engineering, Industrial; Operations Research & Management Science SC Engineering; Operations Research & Management Science GA HY573 UT WOS:A1992HY57300003 ER PT J AU PHAM, H AF PHAM, H TI OPTIMAL SYSTEM-PROFIT DESIGN OF SERIES-PARALLEL SYSTEMS WITH MULTIPLE FAILURE MODES SO RELIABILITY ENGINEERING & SYSTEM SAFETY LA English DT Article ID SHORT-CIRCUIT RELIABILITY AB We treat the problem of achieving optimal subsystem size (m) for series-parallel systems assuming that failure may take either of two forms. We assume that components are independent and identically distributed (i.i.d.) and that the two kinds of system failures can have different costs. In this paper, we determine the optimal m that maximizes the average system-profit. We study how the optimal subsystem size m depends on the system parameters. We also determine the optimal subsystem size, m, which maximizes the average system-profit subject to a restricted type I design error. Numerical examples are given to illustrate the results. RP PHAM, H (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0951-8320 J9 RELIAB ENG SYST SAFE JI Reliab. Eng. Syst. Saf. PY 1992 VL 37 IS 2 BP 151 EP 155 DI 10.1016/0951-8320(92)90008-9 PG 5 WC Engineering, Industrial; Operations Research & Management Science SC Engineering; Operations Research & Management Science GA HY573 UT WOS:A1992HY57300008 ER PT J AU REECE, WJ GERTMAN, DI AF REECE, WJ GERTMAN, DI TI NUCLARR - A WORKSTATION SOFTWARE PACKAGE TO SUPPORT RISK ASSESSMENT SO RELIABILITY ENGINEERING & SYSTEM SAFETY LA English DT Article AB In a multi-year effort sponsored by the US Nuclear Regulatory Commission, specialists in human factors, risk analysis, and software design have developed the Nuclear Computerized Library for Assessing Reactor Reliability (NUCLARR). This PC-based workstation software package supports probabilistic risk assessment and other risk analysis efforts by providing a repository of both human error probability rates and hardware component failure data. System documentation includes a User's Guide which leads the user through simple installation procedures, presents detailed descriptions of resident data, and reviews the software package capabilities. The majority of failure rate estimates contained in NUCLARR have nuclear power plants as their source. However, many human failure rate estimates are not specific to the nuclear industry and may be used equally well for analyses in other settings. This paper discusses the capabilities of the data base, and includes sample human error and hardware failure data. RP REECE, WJ (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,MS 2405,IDAHO FALLS,ID 83401, USA. NR 16 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0951-8320 J9 RELIAB ENG SYST SAFE JI Reliab. Eng. Syst. Saf. PY 1992 VL 37 IS 2 BP 173 EP 178 DI 10.1016/0951-8320(92)90011-9 PG 6 WC Engineering, Industrial; Operations Research & Management Science SC Engineering; Operations Research & Management Science GA HY573 UT WOS:A1992HY57300011 ER PT J AU ATWOOD, CL AF ATWOOD, CL TI PARAMETRIC-ESTIMATION OF TIME-DEPENDENT FAILURE RATES FOR PROBABILISTIC RISK ASSESSMENT SO RELIABILITY ENGINEERING & SYSTEM SAFETY LA English DT Article ID RELIABILITY AB This article describes a method for modeling a time-dependent failure rate, based on field data from similar components that are repeatedly restored to service after they fail. The method assumes that the failures follow a Poisson process, but allows many parametric models for the time-dependent failure rate-lambda(t). Ways to check many of the assumptions form an important part of the method. When the assumptions are satisfied, the maximum likelihood estimate of lambda(t) is approximately lognormal, and this lognormal distribution is appropriate to use as a Bayesian distribution for lambda(t) in a probabilistic risk assessment. RP ATWOOD, CL (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 18 TC 15 Z9 15 U1 1 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0951-8320 J9 RELIAB ENG SYST SAFE JI Reliab. Eng. Syst. Saf. PY 1992 VL 37 IS 3 BP 181 EP 194 DI 10.1016/0951-8320(92)90122-2 PG 14 WC Engineering, Industrial; Operations Research & Management Science SC Engineering; Operations Research & Management Science GA JD338 UT WOS:A1992JD33800001 ER PT J AU KELLY, DL AF KELLY, DL TI PROBABILISTIC ANALYSIS OF FLOW-CONTROL AS AN ALTERNATIVE TO LEVEL CONTROL FOR BWR ATWS SO RELIABILITY ENGINEERING & SYSTEM SAFETY LA English DT Article AB This paper presents a simple probabilistic analysis of an alternative strategy for responding to a severe anticipated transient without scram sequence in a boiling water reactor. The point estimate ATWS core damage frequency associated with current emergency procedure guidelines to control reactor vessel level is calculated and compared with the frequency associated with an alternative strategy of directly controlling the injection flow rate. Potential benefits and drawbacks associated with each strategy are also discussed. RP KELLY, DL (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 15 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0951-8320 J9 RELIAB ENG SYST SAFE JI Reliab. Eng. Syst. Saf. PY 1992 VL 36 IS 2 BP 87 EP 94 DI 10.1016/0951-8320(92)90089-4 PG 8 WC Engineering, Industrial; Operations Research & Management Science SC Engineering; Operations Research & Management Science GA HH226 UT WOS:A1992HH22600001 ER PT J AU HELTON, JC ROLLSTIN, JA SPRUNG, JL JOHNSON, JD AF HELTON, JC ROLLSTIN, JA SPRUNG, JL JOHNSON, JD TI AN EXPLORATORY SENSITIVITY STUDY WITH THE MACCS REACTOR ACCIDENT CONSEQUENCE MODEL SO RELIABILITY ENGINEERING & SYSTEM SAFETY LA English DT Review ID COMPUTER-MODELS; INPUT VARIABLES; UNCERTAINTY; SEQUENCE; CODE AB An exploratory sensitivity study with the MELCOR Accident Consequence Code System (MACCS) is presented. This study was performed to provide (1) an indication of the possible impact of consequence modeling uncertainties on the results of an integrated probabilistic risk assessment for a nuclear power station; (2) guidance on important parameters to direct data acquisition for future uncertainty analyses with MACCS; (3) a check that MACCS is operating as intended; and (4) insights on the effect of problem gridding on model resolution. The sensitivity results obtained in this study involve fatalities and injuries due to radiation exposure incurred within seven days of an accident and are based on the group of source terms (i.e. source term cluster) that made the largest contribution to early fatality risk in a probablistic risk assessment for the Peach Bottom Atomic Power Station. The following consequence measures were investigated: early fatalities, prodromal vomiting, lung impairment, population dose (0-500 miles), population dose (0-10 miles), mean early fatality distance, maximum early fatality distance, mean early fatality risk, probability of one or more early fatalities, and amount of central processing unit (CPU) time required to evaluate MACCS. The analysis used techniques based on Latin hypercube sampling and regression analysis. Results obtained in this study indicate that (1) the impact of consequence modeling uncertainty in an integrated risk assessment may be significant; (2) dominant variables involving early health effects include evacuation area, scaling for horizontal dispersion, population relocation time, dry deposition velocity, and groundshine shielding; (3) the models in MACCS related to early health effects are implemented correctly; and (4) model resolution may be improved by finer radial gridding. C1 GRAM INC,ALBUQUERQUE,NM 87112. SANDIA NATL LABS,DIV REACTOR SAFETY INTEGRAT,ALBUQUERQUE,NM 87185. SCI APPLICAT INT CORP,ALBUQUERQUE,NM 87102. RP HELTON, JC (reprint author), ARIZONA STATE UNIV,DEPT MATH,TEMPE,AZ 85287, USA. NR 130 TC 9 Z9 9 U1 1 U2 3 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0951-8320 J9 RELIAB ENG SYST SAFE JI Reliab. Eng. Syst. Saf. PY 1992 VL 36 IS 2 BP 137 EP 164 DI 10.1016/0951-8320(92)90095-3 PG 28 WC Engineering, Industrial; Operations Research & Management Science SC Engineering; Operations Research & Management Science GA HH226 UT WOS:A1992HH22600007 ER PT J AU HELTON, JC BREEDING, RJ HORA, SC AF HELTON, JC BREEDING, RJ HORA, SC TI PROBABILITY OF CONTAINMENT FAILURE MODE FOR FAST PRESSURE RISE SO RELIABILITY ENGINEERING & SYSTEM SAFETY LA English DT Article AB An expert elicitation process was used in the NUREG-1150 probabilistic risk assessments to develop probability distributions for containment failure pressure and mode (leak, rupture or catastrophic rupture) in the presence of a slow pressure rise. Subsequently, the need arose to extend these results to situations in which the pressure rise was sufficiently fast that a leak in the containment would not arrest pressure rise and thus in which additional containment failures could follow an initial leak. Two means of implementing this extension are presented. Both extensions are based on the assumption that a leak in the presence of a fast pressure rise will not affect the occurrence of additional failures. The mathematics of the two extensions is carefully developed. Further, they are shown to lead to the same expected results in analyses based on Latin hypercube sampling. C1 SANDIA NATL LABS,DIV 6411,ALBUQUERQUE,NM 87185. UNIV HAWAII,DIV BUSINESS ADM & ECON,HILO,HI 96720. RP HELTON, JC (reprint author), ARIZONA STATE UNIV,DEPT MATH,TEMPE,AZ 85287, USA. NR 20 TC 5 Z9 5 U1 1 U2 2 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0951-8320 J9 RELIAB ENG SYST SAFE JI Reliab. Eng. Syst. Saf. PY 1992 VL 35 IS 2 BP 91 EP 106 DI 10.1016/0951-8320(92)90029-K PG 16 WC Engineering, Industrial; Operations Research & Management Science SC Engineering; Operations Research & Management Science GA GU393 UT WOS:A1992GU39300001 ER PT J AU GERTMAN, DI BLACKMAN, HS HANEY, LN SEIDLER, KS HAHN, HA AF GERTMAN, DI BLACKMAN, HS HANEY, LN SEIDLER, KS HAHN, HA TI INTENT - A METHOD FOR ESTIMATING HUMAN ERROR PROBABILITIES FOR DECISION-BASED ERRORS SO RELIABILITY ENGINEERING & SYSTEM SAFETY LA English DT Article AB The development of a method, INTENT, for estimating probabilities associated with decisionbased errors is presented. These errors are not ordinarily incorporated into probabilistic risk assessments (PRAs) due to both the difficulty in postulating such errors and to the lack of a method for estimating their probabilities from existing data. By failing to include decisionbased errors in their analyses, most PRA practitioners seriously underestimate the true contribution of human actions to systems failure. This paper attempts to extend the identification of such errors and to quantify them. Two sources, Nuclear Computerized Library for Assessing Reactor Reliability (NUCLARR) and licensee event reports (LERs) were reviewed and two methods, HSYS and SNEAK, were used to identify a generic list of twenty potential errors which may be manifest as erroneous acts. Four categories of influence emerged from the data: consequence, attitudes, response set, and dependency. Corresponding human error probabilities (HEPs) for each error were generated by expert judgment methods. Lower and upper bounds for the HEPs for each error were determined by positing a situation reflecting optimized and degraded performance shaping factors, respectively. To allow analysts the opportunity to refine these extreme HEP values when evaluating a particular scenario of interest, normalization procedures were conducted and generic importance weights were computed for each of 11 performance shaping factors (PSFs) believed to affect the 20 decisionbased errors. It is believed by the authors that PSFs constitute a performance influence which, in some cases, such as in that for training, can serve to either augment or reduce the intellectual resources used by people to successfully accomplish tasks. These derived importance weights are used in conjunction with situation specific PSF ratings to compute a composite PSF score which, in turn, is mapped onto an HEP distribution. Distribution assumptions are presented and a function defining the relationship between composite PSF scores and HEPs is presented for use by the analyst. RP GERTMAN, DI (reprint author), IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 18 TC 23 Z9 25 U1 0 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0951-8320 J9 RELIAB ENG SYST SAFE JI Reliab. Eng. Syst. Saf. PY 1992 VL 35 IS 2 BP 127 EP 136 DI 10.1016/0951-8320(92)90032-G PG 10 WC Engineering, Industrial; Operations Research & Management Science SC Engineering; Operations Research & Management Science GA GU393 UT WOS:A1992GU39300004 ER PT J AU PHAM, H PHAM, M AF PHAM, H PHAM, M TI RELIABILITY-ANALYSIS OF DYNAMIC REDUNDANT-SYSTEMS WITH IMPERFECT COVERAGE SO RELIABILITY ENGINEERING & SYSTEM SAFETY LA English DT Article AB This paper considers the problem of determining the optimal number of spare modules in a dynamic redundant system. Two versions of the problem are treated. First, it is shown how to minimize the average system cost. Second, it is shown how to maximize the reliability of the system with imperfect coverage. Some numerical examples are also obtained to illustrate the results. RP PHAM, H (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625 IDAHO FALLS,IDAHO FALLS,ID 83415, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0951-8320 J9 RELIAB ENG SYST SAFE JI Reliab. Eng. Syst. Saf. PY 1992 VL 35 IS 2 BP 173 EP 176 DI 10.1016/0951-8320(92)90037-L PG 4 WC Engineering, Industrial; Operations Research & Management Science SC Engineering; Operations Research & Management Science GA GU393 UT WOS:A1992GU39300009 ER PT J AU KELLY, DL AF KELLY, DL TI ON THE HUMAN ERROR-PROBABILITY FOR INJECTING BORON DURING ATWS AT A BWR SO RELIABILITY ENGINEERING & SYSTEM SAFETY LA English DT Note AB This note presents a calculation and discussion of the probability of operator failure to inject boron with the standby liquid control (SLC) system during an anticipated transient without scram (ATWS) at a boiling water reactor (BWR). Calculated results are compared to the value used in some past risk assessments, as well as with the estimated SLC hardware unavailability, to determine if the assertion that the SLC hardware unavailability dominates the human error probability is reasonable. The sensitivity of this calculation to the value used for the suppression pool heat capacity temperature limit is also examined. RP KELLY, DL (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,MS 2405,POB 1625,IDAHO FALLS,ID 83415, USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0951-8320 J9 RELIAB ENG SYST SAFE JI Reliab. Eng. Syst. Saf. PY 1992 VL 35 IS 3 BP 253 EP 255 DI 10.1016/0951-8320(92)90084-X PG 3 WC Engineering, Industrial; Operations Research & Management Science SC Engineering; Operations Research & Management Science GA GW715 UT WOS:A1992GW71500010 ER PT B AU YAGIL, A AF YAGIL, A BE Greco, M TI SEARCH FOR Lambda B>J psi Lambda B>0 AT CDF SO RENCONTRES DE PHYSIQUE DE LA VALLEE D'AOSTE - RESULTS AND PERSPECTIVES IN PARTICLE PHYSICS, 1992 LA English DT Proceedings Paper CT Conference on Physics - Results and Perspectives in Particle Physics CY MAR 08-14, 1992 CL LA THUILE, ITALY C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. NR 0 TC 0 Z9 0 U1 0 U2 0 PU EDITIONS FRONTIERES PI DREUX PA 7 AVENUE KENNEDY, 28100 DREUX, FRANCE BN 2-86332-120-X PY 1992 BP 137 EP 145 PG 9 WC Physics, Atomic, Molecular & Chemical SC Physics GA BC34L UT WOS:A1992BC34L00011 ER PT B AU RODRIGO, T AF RODRIGO, T BE Greco, M TI TOP QUARK SEARCH - RESULTS AND PROSPECTS AT FERMILAB SO RENCONTRES DE PHYSIQUE DE LA VALLEE D'AOSTE - RESULTS AND PERSPECTIVES IN PARTICLE PHYSICS, 1992 LA English DT Proceedings Paper CT Conference on Physics - Results and Perspectives in Particle Physics CY MAR 08-14, 1992 CL LA THUILE, ITALY C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. NR 0 TC 0 Z9 0 U1 0 U2 0 PU EDITIONS FRONTIERES PI DREUX PA 7 AVENUE KENNEDY, 28100 DREUX, FRANCE BN 2-86332-120-X PY 1992 BP 149 EP 174 PG 26 WC Physics, Atomic, Molecular & Chemical SC Physics GA BC34L UT WOS:A1992BC34L00012 ER PT S AU BUSHAW, BA AF BUSHAW, BA BE Miller, CM Parks, JE TI ATTOGRAM MEASUREMENT OF RARE ISOTOPES BY CW RESONANCE IONIZATION MASS-SPECTROMETRY SO RESONANCE IONIZATION SPECTROSCOPY 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 6TH INTERNATIONAL SYMP ON RESONANCE IONIZATION SPECTROSCOPY AND ITS APPLICATIONS CY MAY 24-29, 1992 CL SANTA FE, NM SP US DOE, ATOM SCI, COHERENT, CONTINUUM, KRATOS ANAL, LUMONICS, SPECTRA PHYS LASERS, UNIV TENNESSEE, LOS ALAMOS NATL LAB RP BUSHAW, BA (reprint author), BATTELLE MEM INST,PACIFIC NW LABS,RICHLAND,WA 99352, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-7503-0230-5 J9 INST PHYS CONF SER PY 1992 VL 128 BP 31 EP 36 PG 6 WC Instruments & Instrumentation; Optics; Spectroscopy SC Instruments & Instrumentation; Optics; Spectroscopy GA BZ19N UT WOS:A1992BZ19N00008 ER PT S AU PAGE, RH DROPINSKI, SC WORDEN, EF STOCKDALE, JAD AF PAGE, RH DROPINSKI, SC WORDEN, EF STOCKDALE, JAD BE Miller, CM Parks, JE TI RESONANCE IONIZATION SPECTROSCOPY OF ZIRCONIUM ATOMS SO RESONANCE IONIZATION SPECTROSCOPY 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 6TH INTERNATIONAL SYMP ON RESONANCE IONIZATION SPECTROSCOPY AND ITS APPLICATIONS CY MAY 24-29, 1992 CL SANTA FE, NM SP US DOE, ATOM SCI, COHERENT, CONTINUUM, KRATOS ANAL, LUMONICS, SPECTRA PHYS LASERS, UNIV TENNESSEE, LOS ALAMOS NATL LAB RP PAGE, RH (reprint author), LAWRENCE LIVERMORE NATL LAB,AVLIS PROGRAM,POB 808,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-7503-0230-5 J9 INST PHYS CONF SER PY 1992 VL 128 BP 63 EP 66 PG 4 WC Instruments & Instrumentation; Optics; Spectroscopy SC Instruments & Instrumentation; Optics; Spectroscopy GA BZ19N UT WOS:A1992BZ19N00014 ER PT S AU TISSUE, BM MILLER, CM FEAREY, BL AF TISSUE, BM MILLER, CM FEAREY, BL BE Miller, CM Parks, JE TI SATURATION BROADENING EFFECTS IN THE RESONANCE IONIZATION SPECTROSCOPY OF THORIUM SO RESONANCE IONIZATION SPECTROSCOPY 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 6TH INTERNATIONAL SYMP ON RESONANCE IONIZATION SPECTROSCOPY AND ITS APPLICATIONS CY MAY 24-29, 1992 CL SANTA FE, NM SP US DOE, ATOM SCI, COHERENT, CONTINUUM, KRATOS ANAL, LUMONICS, SPECTRA PHYS LASERS, UNIV TENNESSEE, LOS ALAMOS NATL LAB RP TISSUE, BM (reprint author), LOS ALAMOS NATL LAB,ISOTOPE SCI GRP,INC-6,LOS ALAMOS,NM 87545, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-7503-0230-5 J9 INST PHYS CONF SER PY 1992 VL 128 BP 95 EP 98 PG 4 WC Instruments & Instrumentation; Optics; Spectroscopy SC Instruments & Instrumentation; Optics; Spectroscopy GA BZ19N UT WOS:A1992BZ19N00022 ER PT S AU GARRETT, WR AF GARRETT, WR BE Miller, CM Parks, JE TI ALTERATIONS OF MULTIPHOTON-RESONANT PROCESSES THROUGH WAVE-MIXING EFFECTS SO RESONANCE IONIZATION SPECTROSCOPY 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 6TH INTERNATIONAL SYMP ON RESONANCE IONIZATION SPECTROSCOPY AND ITS APPLICATIONS CY MAY 24-29, 1992 CL SANTA FE, NM SP US DOE, ATOM SCI, COHERENT, CONTINUUM, KRATOS ANAL, LUMONICS, SPECTRA PHYS LASERS, UNIV TENNESSEE, LOS ALAMOS NATL LAB RP GARRETT, WR (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37830, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-7503-0230-5 J9 INST PHYS CONF SER PY 1992 VL 128 BP 111 EP 117 PG 7 WC Instruments & Instrumentation; Optics; Spectroscopy SC Instruments & Instrumentation; Optics; Spectroscopy GA BZ19N UT WOS:A1992BZ19N00025 ER PT S AU BRANDON, WD ALLMAN, SL GARRETT, WR CHEN, CH PAYNE, MG PARKS, JE AF BRANDON, WD ALLMAN, SL GARRETT, WR CHEN, CH PAYNE, MG PARKS, JE BE Miller, CM Parks, JE TI ISOTOPE BIASES IN RIMS UTILIZING BROAD-BAND LONG-PULSED LASERS SO RESONANCE IONIZATION SPECTROSCOPY 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 6TH INTERNATIONAL SYMP ON RESONANCE IONIZATION SPECTROSCOPY AND ITS APPLICATIONS CY MAY 24-29, 1992 CL SANTA FE, NM SP US DOE, ATOM SCI, COHERENT, CONTINUUM, KRATOS ANAL, LUMONICS, SPECTRA PHYS LASERS, UNIV TENNESSEE, LOS ALAMOS NATL LAB RP BRANDON, WD (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. RI Allman, Steve/A-9121-2011 OI Allman, Steve/0000-0001-6538-7048 NR 0 TC 0 Z9 0 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-7503-0230-5 J9 INST PHYS CONF SER PY 1992 VL 128 BP 119 EP 122 PG 4 WC Instruments & Instrumentation; Optics; Spectroscopy SC Instruments & Instrumentation; Optics; Spectroscopy GA BZ19N UT WOS:A1992BZ19N00026 ER PT S AU WIEDMANN, RT TONKYN, RG GRANT, ER WHITE, MG AF WIEDMANN, RT TONKYN, RG GRANT, ER WHITE, MG BE Miller, CM Parks, JE TI PHOTOIONIZATION DYNAMICS AND CATION SPECTROSCOPY WITH COHERENT VUV RADIATION SO RESONANCE IONIZATION SPECTROSCOPY 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 6TH INTERNATIONAL SYMP ON RESONANCE IONIZATION SPECTROSCOPY AND ITS APPLICATIONS CY MAY 24-29, 1992 CL SANTA FE, NM SP US DOE, ATOM SCI, COHERENT, CONTINUUM, KRATOS ANAL, LUMONICS, SPECTRA PHYS LASERS, UNIV TENNESSEE, LOS ALAMOS NATL LAB RP WIEDMANN, RT (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-7503-0230-5 J9 INST PHYS CONF SER PY 1992 VL 128 BP 161 EP 166 PG 6 WC Instruments & Instrumentation; Optics; Spectroscopy SC Instruments & Instrumentation; Optics; Spectroscopy GA BZ19N UT WOS:A1992BZ19N00036 ER PT S AU PELLIN, MJ LYKKE, KR WURZ, P PARKER, DH AF PELLIN, MJ LYKKE, KR WURZ, P PARKER, DH BE Miller, CM Parks, JE TI MOLECULAR-SURFACE ANALYSIS BY LASER IONIZATION OF DESORBED MOLECULES SO RESONANCE IONIZATION SPECTROSCOPY 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 6TH INTERNATIONAL SYMP ON RESONANCE IONIZATION SPECTROSCOPY AND ITS APPLICATIONS CY MAY 24-29, 1992 CL SANTA FE, NM SP US DOE, ATOM SCI, COHERENT, CONTINUUM, KRATOS ANAL, LUMONICS, SPECTRA PHYS LASERS, UNIV TENNESSEE, LOS ALAMOS NATL LAB RP PELLIN, MJ (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-7503-0230-5 J9 INST PHYS CONF SER PY 1992 VL 128 BP 167 EP 172 PG 6 WC Instruments & Instrumentation; Optics; Spectroscopy SC Instruments & Instrumentation; Optics; Spectroscopy GA BZ19N UT WOS:A1992BZ19N00037 ER PT S AU DESAI, S FEIGERLE, CS MILLER, JC AF DESAI, S FEIGERLE, CS MILLER, JC BE Miller, CM Parks, JE TI NITRIC-OXIDE CONTAINING HETEROCLUSTERS PROBED BY 2-PHOTON IONIZATION IN A SUPERSONIC EXPANSION SO RESONANCE IONIZATION SPECTROSCOPY 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 6TH INTERNATIONAL SYMP ON RESONANCE IONIZATION SPECTROSCOPY AND ITS APPLICATIONS CY MAY 24-29, 1992 CL SANTA FE, NM SP US DOE, ATOM SCI, COHERENT, CONTINUUM, KRATOS ANAL, LUMONICS, SPECTRA PHYS LASERS, UNIV TENNESSEE, LOS ALAMOS NATL LAB RP DESAI, S (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 0 TC 2 Z9 2 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-7503-0230-5 J9 INST PHYS CONF SER PY 1992 VL 128 BP 173 EP 176 PG 4 WC Instruments & Instrumentation; Optics; Spectroscopy SC Instruments & Instrumentation; Optics; Spectroscopy GA BZ19N UT WOS:A1992BZ19N00038 ER PT S AU FEAREY, BL TISSUE, BM OLIVARES, JA LOGE, GW MURRELL, MT MILLER, CM AF FEAREY, BL TISSUE, BM OLIVARES, JA LOGE, GW MURRELL, MT MILLER, CM BE Miller, CM Parks, JE TI HIGH-PRECISION THORIUM RIMS FOR GEOCHEMISTRY SO RESONANCE IONIZATION SPECTROSCOPY 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 6TH INTERNATIONAL SYMP ON RESONANCE IONIZATION SPECTROSCOPY AND ITS APPLICATIONS CY MAY 24-29, 1992 CL SANTA FE, NM SP US DOE, ATOM SCI, COHERENT, CONTINUUM, KRATOS ANAL, LUMONICS, SPECTRA PHYS LASERS, UNIV TENNESSEE, LOS ALAMOS NATL LAB RP FEAREY, BL (reprint author), LOS ALAMOS NATL LAB,ISOTOPE SCI GRP,INC-6,LOS ALAMOS,NM 87545, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-7503-0230-5 J9 INST PHYS CONF SER PY 1992 VL 128 BP 209 EP 212 PG 4 WC Instruments & Instrumentation; Optics; Spectroscopy SC Instruments & Instrumentation; Optics; Spectroscopy GA BZ19N UT WOS:A1992BZ19N00045 ER PT S AU CALAWAY, WF COON, SR PELLIN, MJ YOUNG, CE WHITTEN, JE WIENS, RC GRUEN, DM STINGEDER, G PENKA, V GRASSERBAUER, M BURNETT, DS AF CALAWAY, WF COON, SR PELLIN, MJ YOUNG, CE WHITTEN, JE WIENS, RC GRUEN, DM STINGEDER, G PENKA, V GRASSERBAUER, M BURNETT, DS BE Miller, CM Parks, JE TI RESONANCE IONIZATION OF SPUTTERED ATOMS - PROGRESS TOWARD A QUANTITATIVE TECHNIQUE SO RESONANCE IONIZATION SPECTROSCOPY 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 6TH INTERNATIONAL SYMP ON RESONANCE IONIZATION SPECTROSCOPY AND ITS APPLICATIONS CY MAY 24-29, 1992 CL SANTA FE, NM SP US DOE, ATOM SCI, COHERENT, CONTINUUM, KRATOS ANAL, LUMONICS, SPECTRA PHYS LASERS, UNIV TENNESSEE, LOS ALAMOS NATL LAB RP CALAWAY, WF (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Pellin, Michael/B-5897-2008 OI Pellin, Michael/0000-0002-8149-9768 NR 0 TC 0 Z9 0 U1 0 U2 4 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-7503-0230-5 J9 INST PHYS CONF SER PY 1992 VL 128 BP 271 EP 274 PG 4 WC Instruments & Instrumentation; Optics; Spectroscopy SC Instruments & Instrumentation; Optics; Spectroscopy GA BZ19N UT WOS:A1992BZ19N00058 ER PT S AU TANG, K ALLMAN, SL CHEN, CH AF TANG, K ALLMAN, SL CHEN, CH BE Miller, CM Parks, JE TI LASER MASS-SPECTROMETRY FOR BIOPOLYMERS SO RESONANCE IONIZATION SPECTROSCOPY 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 6TH INTERNATIONAL SYMP ON RESONANCE IONIZATION SPECTROSCOPY AND ITS APPLICATIONS CY MAY 24-29, 1992 CL SANTA FE, NM SP US DOE, ATOM SCI, COHERENT, CONTINUUM, KRATOS ANAL, LUMONICS, SPECTRA PHYS LASERS, UNIV TENNESSEE, LOS ALAMOS NATL LAB RP TANG, K (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. RI Allman, Steve/A-9121-2011; Tang, Kai/A-2194-2011 OI Allman, Steve/0000-0001-6538-7048; NR 0 TC 0 Z9 0 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-7503-0230-5 J9 INST PHYS CONF SER PY 1992 VL 128 BP 289 EP 292 PG 4 WC Instruments & Instrumentation; Optics; Spectroscopy SC Instruments & Instrumentation; Optics; Spectroscopy GA BZ19N UT WOS:A1992BZ19N00063 ER PT S AU ANDERSON, JE PEREZLOPEZ, BL NOGAR, NS ESTLER, RC CONIA, JE AF ANDERSON, JE PEREZLOPEZ, BL NOGAR, NS ESTLER, RC CONIA, JE BE Miller, CM Parks, JE TI RESONANCE IONIZATION MASS-SPECTROMETRY IN BIOCHEMICAL-ANALYSIS SO RESONANCE IONIZATION SPECTROSCOPY 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 6TH INTERNATIONAL SYMP ON RESONANCE IONIZATION SPECTROSCOPY AND ITS APPLICATIONS CY MAY 24-29, 1992 CL SANTA FE, NM SP US DOE, ATOM SCI, COHERENT, CONTINUUM, KRATOS ANAL, LUMONICS, SPECTRA PHYS LASERS, UNIV TENNESSEE, LOS ALAMOS NATL LAB RP ANDERSON, JE (reprint author), LOS ALAMOS NATL LAB,MS J565,LOS ALAMOS,NM 87545, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-7503-0230-5 J9 INST PHYS CONF SER PY 1992 VL 128 BP 293 EP 296 PG 4 WC Instruments & Instrumentation; Optics; Spectroscopy SC Instruments & Instrumentation; Optics; Spectroscopy GA BZ19N UT WOS:A1992BZ19N00064 ER PT S AU SHAW, RW YOUNG, JP RAMSEY, JM AF SHAW, RW YOUNG, JP RAMSEY, JM BE Miller, CM Parks, JE TI RESONANCE IONIZATION OF RUBIDIUM USING SEQUENTIAL DIODE LASER-DRIVEN TRANSITIONS SO RESONANCE IONIZATION SPECTROSCOPY 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 6TH INTERNATIONAL SYMP ON RESONANCE IONIZATION SPECTROSCOPY AND ITS APPLICATIONS CY MAY 24-29, 1992 CL SANTA FE, NM SP US DOE, ATOM SCI, COHERENT, CONTINUUM, KRATOS ANAL, LUMONICS, SPECTRA PHYS LASERS, UNIV TENNESSEE, LOS ALAMOS NATL LAB RP SHAW, RW (reprint author), OAK RIDGE NATL LAB,DIV ANALYT CHEM,POB 2008,OAK RIDGE,TN 37831, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-7503-0230-5 J9 INST PHYS CONF SER PY 1992 VL 128 BP 297 EP 300 PG 4 WC Instruments & Instrumentation; Optics; Spectroscopy SC Instruments & Instrumentation; Optics; Spectroscopy GA BZ19N UT WOS:A1992BZ19N00065 ER PT S AU ALEXANDER, ML CISPER, ME HEMBERGER, PH NOGAR, NS WILLIAMS, JD SYKA, JEP AF ALEXANDER, ML CISPER, ME HEMBERGER, PH NOGAR, NS WILLIAMS, JD SYKA, JEP BE Miller, CM Parks, JE TI LASER-BASED STUDIES WITH AN ION-TRAP MASS-SPECTROMETER - ION TOMOGRAPHY AND ANALYTICAL APPLICATIONS SO RESONANCE IONIZATION SPECTROSCOPY 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 6TH INTERNATIONAL SYMP ON RESONANCE IONIZATION SPECTROSCOPY AND ITS APPLICATIONS CY MAY 24-29, 1992 CL SANTA FE, NM SP US DOE, ATOM SCI, COHERENT, CONTINUUM, KRATOS ANAL, LUMONICS, SPECTRA PHYS LASERS, UNIV TENNESSEE, LOS ALAMOS NATL LAB RP ALEXANDER, ML (reprint author), LOS ALAMOS NATL LAB,MS 1565,LOS ALAMOS,NM 87545, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-7503-0230-5 J9 INST PHYS CONF SER PY 1992 VL 128 BP 337 EP 341 PG 5 WC Instruments & Instrumentation; Optics; Spectroscopy SC Instruments & Instrumentation; Optics; Spectroscopy GA BZ19N UT WOS:A1992BZ19N00075 ER PT S AU YOUNG, JP SHAW, RW AF YOUNG, JP SHAW, RW BE Miller, CM Parks, JE TI A MINIATURE CARBON FURNACE FOR MASS-SPECTROMETRY SO RESONANCE IONIZATION SPECTROSCOPY 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 6TH INTERNATIONAL SYMP ON RESONANCE IONIZATION SPECTROSCOPY AND ITS APPLICATIONS CY MAY 24-29, 1992 CL SANTA FE, NM SP US DOE, ATOM SCI, COHERENT, CONTINUUM, KRATOS ANAL, LUMONICS, SPECTRA PHYS LASERS, UNIV TENNESSEE, LOS ALAMOS NATL LAB RP YOUNG, JP (reprint author), OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-7503-0230-5 J9 INST PHYS CONF SER PY 1992 VL 128 BP 347 EP 350 PG 4 WC Instruments & Instrumentation; Optics; Spectroscopy SC Instruments & Instrumentation; Optics; Spectroscopy GA BZ19N UT WOS:A1992BZ19N00077 ER PT S AU MILLER, CM PARKS, JE AF MILLER, CM PARKS, JE BE Miller, CM Parks, JE TI RESONANCE IONIZATION SPECTROSCOPY 1992 - PROCEEDINGS OF THE 6TH INTERNATIONAL-SYMPOSIUM ON RESONANCE IONIZATION SPECTROSCOPY AND ITS APPLICATIONS HELD IN SANTA-FE, NEW-MEXICO, USA, 24-29 MAY 1992 - PREFACE SO RESONANCE IONIZATION SPECTROSCOPY 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Editorial Material CT 6TH INTERNATIONAL SYMP ON RESONANCE IONIZATION SPECTROSCOPY AND ITS APPLICATIONS CY MAY 24-29, 1992 CL SANTA FE, NM SP US DOE, ATOM SCI, COHERENT, CONTINUUM, KRATOS ANAL, LUMONICS, SPECTRA PHYS LASERS, UNIV TENNESSEE, LOS ALAMOS NATL LAB RP MILLER, CM (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-7503-0230-5 J9 INST PHYS CONF SER PY 1992 VL 128 BP R5 EP R7 PG 3 WC Instruments & Instrumentation; Optics; Spectroscopy SC Instruments & Instrumentation; Optics; Spectroscopy GA BZ19N UT WOS:A1992BZ19N00001 ER PT J AU ROGERS, JH DEGROOT, JS HWANG, DQ AF ROGERS, JH DEGROOT, JS HWANG, DQ TI VALIDATING CYLINDRICAL LANGMUIR PROBE TECHNIQUES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB Several methods for estimating the plasma potential and density using cylindrical Langmuir probes are compared to the self-consistent solutions of the Vlasov-Poisson equations calculated by Laframboise (J. G. Laframboise, Ph. D. dissertation, University of Toronto, 1966). Measurements are made during the decay of a magnetic-field-free plasma in which the mean-free path of the electron is shorter than the dimensions of the vacuum vessel (the electrons, therefore, have a Maxwellian velocity distribution). The measurements are made in a parameter range in which exact analytical solutions do not exist for the ion and electron saturation currents, 0.5 less-than-or-equal-to R/lambda(De) less-than-or-equal-to 5, where R is the probe radius and lambda(De) is the electron Debye length (kT(e)/4-pi-ne2)1/2. An iterative procedure is used to fit the data at probe voltages both above and below the plasma potential while constraining the curves to be continuous at the plasma potential. The measured curves could be represented extremely well by the numerical results. It is therefore assumed that the plasma parameters used to fit the numerical results to the measurements are correct. The systematic errors which result from using several analysis techniques which assume R/lambda(De) << 1 are also presented, and it is shown that empirical corrections to these errors can be described which compensate for the finite probe radius. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP ROGERS, JH (reprint author), UNIV CALIF DAVIS,DAVIS,CA 95616, USA. NR 9 TC 10 Z9 10 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 31 EP 36 DI 10.1063/1.1142743 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ625 UT WOS:A1992GZ62500004 ER PT J AU DOMKE, M MANDEL, T PUSCHMANN, A XUE, C SHIRLEY, DA KAINDL, G PETERSEN, H KUSKE, P AF DOMKE, M MANDEL, T PUSCHMANN, A XUE, C SHIRLEY, DA KAINDL, G PETERSEN, H KUSKE, P TI PERFORMANCE OF THE HIGH-RESOLUTION SX700/II MONOCHROMATOR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID K-SHELL EXCITATION; X-RAY MONOCHROMATORS; ELECTRON-IMPACT; ENERGY; MOLECULE; CARBON; CO; PHOTOABSORPTION; PHOTOIONIZATION; SPECTROSCOPY AB This article reports on the high-resolution performance of the grazing-incidence plane grating monochromator SX700/II, installed at BESSY by the Freie Universitat Berlin, in the photon energy range from about 40 to 900 eV. The high resolving power up to 10 000 achieved with this monochromator is based on improving the figure error of the ellipsoidal focusing mirror, on reducing the vertical dimension of the beam source, and on employing a 5-mu-m exit slit. We report on high-resolution gas-phase studies in the double-excitation region of He, as well as at core-excitation thresholds of Ne, Ar, Kr, and Xe in the photon-energy range from congruent-to 45 eV to congruent-to 900 eV. In addition, high-resolution core-excitation spectra at the K thresholds of C, N, and O are presented for gas-phase CO, N2, and O2. In all cases, high-n Rydberg states and/or vibrational sidebands of the electronic excitations were resolved. The various contributions to the present instrumental linewidths are discussed as well as the prospects for further improvements in resolution with this monochromator. C1 GESELL SYNCHROTRONSTRAHLUNG MBH,BERLINER ELEKTRONENSPEICHERRING,W-1000 BERLIN 33,GERMANY. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP DOMKE, M (reprint author), FREE UNIV BERLIN,INST EXPTL PHYS,ARNIMALLEE 14,W-1000 BERLIN 33,GERMANY. NR 31 TC 123 Z9 124 U1 2 U2 12 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 JAN PY 1992 VL 63 IS 1 BP 80 EP 89 DI 10.1063/1.1142615 PG 10 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ625 UT WOS:A1992GZ62500012 ER PT J AU OGLETREE, DF BLACKMAN, GS HWANG, RQ STARKE, U SOMORJAI, GA KATZ, JE AF OGLETREE, DF BLACKMAN, GS HWANG, RQ STARKE, U SOMORJAI, GA KATZ, JE TI A NEW PULSE COUNTING LOW-ENERGY ELECTRON-DIFFRACTION SYSTEM BASED ON A POSITION-SENSITIVE DETECTOR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID LEED INTENSITY ANALYSIS; MICROCHANNEL PLATES; STRUCTURAL-ANALYSIS; LOSS SPECTROSCOPY; CARBON-MONOXIDE; DISORDERED CO; DIFFUSE LEED; STRIP ANODES; X-RAY; PT(111) AB A new low-energy electron diffraction (LEED) system has been constructed with a pulse counting position sensitive detector using channel plates and a wedge and strip anode. The detector accepts diffracted electrons over a 120-degrees angle and the LEED pattern is recorded as a 256 x 256 pixel image. Individual LEED spot intensities can be measured up to a maximum linear count rate of approximately 5 kHz while the dark count rate is approximately 0.02 Hz, yielding a dynamic range greater than 10(5). Incident beam currents for LEED measurements are approximately 1 pA. Diffuse LEED intensities from disordered systems can be measured using the large dynamic range of this instrument. Examples of diffuse LEED measurements are presented. The low incident beam currents also allow for LEED intensity-voltage measurements on surfaces sensitive to electron beam damage and on nonconducting surfaces. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV ENGN, BERKELEY, CA 94720 USA. RP UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV MAT SCI, CTR ADV MAT, 1 CYCLOTRON RD, BERKELEY, CA 94720 USA. RI Ogletree, D Frank/D-9833-2016 OI Ogletree, D Frank/0000-0002-8159-0182 NR 43 TC 26 Z9 28 U1 1 U2 4 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0034-6748 EI 1089-7623 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 104 EP 113 DI 10.1063/1.1143196 PG 10 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ625 UT WOS:A1992GZ62500016 ER PT J AU STRONGIN, DR MOWLEM, JK LYNN, KG KONG, Y AF STRONGIN, DR MOWLEM, JK LYNN, KG KONG, Y TI EFFICIENT MAGNETIC FOCUSING OF LOW-ENERGY IONS (1-5-EV) ONTO SOLIDS FOR USE IN SURFACE-CHEMISTRY STUDIES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID BEAM AB A method is described that allows the efficient collection and focusing of ions, with kinetic energies between 1 and 5 eV, onto a nonmagnetic metal surface. Magnetic fields near the sample are used to focus the low-energy ions and typical currents achieved thus far exceed 100 nA/cm2 for 1-eV ion energies. The magnetic field of a magnet placed behind the sample significantly reduces the problem of transverse displacement of the ions due to beam divergence and space-charge effects. The magnetic field confines the particle to a circular orbit along the axial direction (cyclotron motion), while leaving the kinetic energy of the ion unaffected. We have utilized this method to interact Ar+ and CH3+ with 1-eV translational energy and 100 nA of current on a Pt surface. C1 BROOKHAVEN NATL LAB,DEPT DEV & CELL BIOL,UPTON,NY 11973. RP STRONGIN, DR (reprint author), SUNY STONY BROOK,DEPT CHEM,STONY BROOK,NY 11794, USA. NR 8 TC 9 Z9 9 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 175 EP 178 DI 10.1063/1.1142952 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ625 UT WOS:A1992GZ62500025 ER PT J AU GREEN, MA KIM, KJ VICCARO, PJ GLUSKIN, E HALBACH, K SAVOY, R TRZECIAK, WS AF GREEN, MA KIM, KJ VICCARO, PJ GLUSKIN, E HALBACH, K SAVOY, R TRZECIAK, WS TI RAPIDLY MODULATED VARIABLE-POLARIZATION CROSSED-UNDULATOR SOURCE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS AB An integrated system to produce and utilize variable-polarization radiation from a crossed undulator source on the Aladdin storage ring is being designed in a multilaboratory collaboration. Brief discussions of the motivation and options available precede a description of the source. Comments on ongoing work are also presented. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,EXPLORATORY STUDIES GRP,BERKELEY,CA 94720. ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439. RP GREEN, MA (reprint author), UNIV WISCONSIN,CTR SYNCHROTRON RADIAT,3731 SCHNEIDER DR,STOUGHTON,WI 53589, USA. NR 8 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 336 EP 337 DI 10.1063/1.1142748 PN 2A PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700013 ER PT J AU CARR, R NUHN, HD AF CARR, R NUHN, HD TI DESIGN STUDY FOR AN ADJUSTABLE PHASE UNDULATOR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS ID MAGNETS AB This is a presentation of the results of a design study for an adjustable phase undulator. Earlier work described the basic theory of these undulators, whose magnetic fields are adjusted by moving the rows of magnets longitudinally with respect to each other, while keeping the gap fixed. This paper explores further details of a proposed permanent magnet, phase adjustable, soft x-ray undulator that will be used to test theoretical and calculated performance predictions. We present the Hamiltonian mechanics of the electron-beam and numerical calculations of magnetic fields and trajectories of electrons, including end effects. We also discuss the trajectories of off-axis electrons, the vertical focusing effect, the effects of magnetic errors, and finite emittance effects on the x-ray spectrum. RP CARR, R (reprint author), STANFORD SYNCHROTRON RADIAT LAB,BIN 69,STANFORD,CA 94062, USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 347 EP 351 DI 10.1063/1.1142752 PN 2A PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700016 ER PT J AU HOYER, E CHIN, J HALBACH, K HASSENZAHL, WV HUMPHRIES, D KINCAID, B LANCASTER, H PLATE, D AF HOYER, E CHIN, J HALBACH, K HASSENZAHL, WV HUMPHRIES, D KINCAID, B LANCASTER, H PLATE, D TI THE U5.0 UNDULATOR FOR THE ADVANCED LIGHT-SOURCE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS AB The U5.0 Undulator, an 89 period, 5 cm period length, 4.6 m long insertion device has been designed, is being fabricated, and is scheduled for completion in early 1992. This undulator will be the first high brightness source, in the 50 to 1,500 eV range, for the Advanced Light Source at the Lawrence Berkeley Laboratory. A hybrid magnetic configuration using Nd-Fe-B permanent magnet material and vanadium permendur poles has been selected to achieve the field quality needed to meet performance requirements. The magnetic structure is modular with each half consisting of five assembly sections, which provide the periodic structure, and end structures, for entrance and exit correction, mounted on a steel backing beam. Each assembly section consists of 35 half-period pole assemblies bolted to a mount. The required 0.837 T effective peak field at a 1.4 cm gap has been verified with model measurements. Vertical field integral correction is accomplished with the end structures, each having an arrangement of permanent magnet rotors which will be adjusted to minimize electron beam missteering over the undulator operating field range. To reduce the effect of environmental fields, the steel backing beams are connected through parallel, low-reluctance, Ni-Fe hinges. The magnetic structure is connected through four rollernuts to the drive system that provides gap adjustment with an arrangement of roller screws, chain drives, a gear reduction unit, and a stepper motor driven by a closed loop control system. Magnetic structure and drive system support are from a 2.4 m high structure which includes a support base with four vertical supports. The vacuum chamber design is a two-piece machined and welded 5083-H321 aluminum construction of 5.1 m length. Pumping is with a combination of ion, titanium sublimation pump and nonevaporable getter pumps. Magnetic design, subsystem design, and fabrication progress are presented. RP HOYER, E (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ACCELERATOR & FUS RES,BERKELEY,CA 94720, USA. NR 15 TC 5 Z9 5 U1 0 U2 5 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 JAN PY 1992 VL 63 IS 1 BP 359 EP 362 DI 10.1063/1.1142755 PN 2A PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700019 ER PT J AU BERMAN, LE HASTINGS, JB OVERSLUIZEN, T WOODLE, M AF BERMAN, LE HASTINGS, JB OVERSLUIZEN, T WOODLE, M TI OPTICAL DESIGN AND PERFORMANCE OF THE X25 HYBRID WIGGLER BEAM LINE AT THE NATIONAL SYNCHROTRON LIGHT-SOURCE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS ID MONOCHROMATOR; RADIATION; CRYSTALS; NSLS AB The X25 beam line at the National Synchrotron Light Source (NSLS) began full-power commissioning in 1990. It extracts radiation from a 27 pole hybrid wiggler, which produces up to 1.8 kW of total power with a peak horizontal density of 450 W/mrad and critical energy of 4.6 keV. The design and peformance of the beam line optics are described, in particular, the cooling of the first monochromator crystal. RP BERMAN, LE (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 25 TC 29 Z9 29 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 JAN PY 1992 VL 63 IS 1 BP 428 EP 432 DI 10.1063/1.1142721 PN 2A PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700035 ER PT J AU ARTHUR, J TOMPKINS, WH TROXEL, C CONTOLINI, RJ SCHMITT, E BILDERBACK, DH HENDERSON, C WHITE, J SETTERSTEN, T AF ARTHUR, J TOMPKINS, WH TROXEL, C CONTOLINI, RJ SCHMITT, E BILDERBACK, DH HENDERSON, C WHITE, J SETTERSTEN, T TI MICROCHANNEL WATER COOLING OF SILICON X-RAY MONOCHROMATOR CRYSTALS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID PERFORMANCE AB The use in silicon x-ray monochromator crystals of water cooling channels with dimensions optimized for efficient heat transfer from silicon to water has been investigated. Such channels are typically about 40-mu-m wide and 400-mu-m deep. Procedures have been found for reliably producing microchannel-cooled crystals with very small amounts of residual strain. These crystals have been tested at a high-power wiggler beam line at the Cornell High Energy Synchrotron Source, using an x-ray beam having total power in excess of 250 W and normal-incidence power density greater than 5 W/mm2. Under these conditions, the surface-temperature rise of a typical microchannel-cooled crystal was less than 5-degrees-C, and degradation of the (111) rocking curve at 12 keV was very slight. The cooling efficiency is consistent with analytic calculations. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. CORNELL UNIV, CORNELL HIGH ENERGY SYNCHROTRON SOURCE, ITHACA, NY 14853 USA. CORNELL UNIV, SCH APPL & ENGN PHYS, ITHACA, NY 14853 USA. RP STANFORD SYNCHROTRON RADIAT LAB, POB 4349, BIN 69, STANFORD, CA 94309 USA. RI Settersten, Thomas/B-3480-2009 OI Settersten, Thomas/0000-0002-8017-0258 NR 8 TC 15 Z9 15 U1 1 U2 3 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0034-6748 EI 1089-7623 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 433 EP 436 DI 10.1063/1.1142722 PN 2A PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700036 ER PT J AU FREUND, AK MAROT, G KAWATA, H JOKSCH, S ZIEGLER, E BERMAN, LE HASTINGS, JB AF FREUND, AK MAROT, G KAWATA, H JOKSCH, S ZIEGLER, E BERMAN, LE HASTINGS, JB TI PERFORMANCE OF VERY THIN SILICON SINGLE-CRYSTAL FOILS UNDER HIGH X-RAY POWER-DENSITY SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS ID SYNCHROTRON RADIATION AB In this paper x-ray diffraction tests of very thin silicon single crystals exposed to a wiggler beam that can generate a power density up to 200 W/mm2 are reported on. This beam was provided by the beamline X25 at NSLS, where 75 W total power are focused into a spot of 0.8 mm (h) x 0.45 mm(v). An 11-mu-m "thin" Si foil glued at its periphery onto an aluminium ring at 30-degrees-C was applied to a box that could be pressurized with He. The whole assembly was then mounted on an optically polished and watercooled Be support. By increasing the temperature of the water and thus of the Al ring above 30-degrees-C it was possible to apply a stretching force to the Si membrane in order to keep it flat. Rocking curves 3.3 arcsec wide were obtained with a strongly attenuated beam. The rocking curve width increased to 3.9 arcsec when the power density was increased to 15 W/mm2. The crystal was destroyed at 125 W/mm2 because of the limited thermal conductivity across the small He gap. C1 BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. DESY,HAMBURGER SYNCHROTRONSTRAHLUNGS LAB,W-2000 HAMBURG 52,GERMANY. RP FREUND, AK (reprint author), EUROPEAN SYNCHROTRON RADIAT FACIL,BP 220,F-38043 GRENOBLE,FRANCE. NR 16 TC 12 Z9 12 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 442 EP 445 DI 10.1063/1.1142725 PN 2A PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700038 ER PT J AU FREUND, AK JOKSCH, S KAWATA, H MAROT, G ZIEGLER, E BERMAN, LE HASTINGS, JB AF FREUND, AK JOKSCH, S KAWATA, H MAROT, G ZIEGLER, E BERMAN, LE HASTINGS, JB TI PERFORMANCE OF BERYLLIUM CRYSTALS EXPOSED TO HIGH X-RAY POWER-DENSITY SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS ID SYNCHROTRON RADIATION; MONOCHROMATOR AB High quality beryllium single crystals are currently proposed for several applications in synchrotron radiation x-ray optics, in particular as the first element which will have to take the high power of the beam generated by insertion devices. Be has the advantage that much of this incident radiation is transmitted, especially higher energy wiggler radiation. Therefore, it is important to know how Be crystals behave under high x-ray power. For our test measurements we used the focused wiggler beam of the beam line X25 the National Synchrotron Light Source, Brookhaven, that provides a power of 75 W at 230 mA ring current and a peak power density in excess of 200 W/mm2. A Be crystal was positioned in this white beam and its reflection properties were studied using a perfect silicon analyzer crystal. An "ideal mosaic" type rocking curve 58 arcsec wide was obtained with a strongly attenuated beam increasing to 73 arcsec at 200 W/mm2. No deterioration of the crystal was observed. Much better performance is expected for thinner crystals. It can be concluded that presently available Be single crystals have the properties required for currently proposed application as first optical element. C1 BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. DESY,HAMBURGER SYNCHROTRONSTRAHLUNGS LAB,W-2000 HAMBURG 52,GERMANY. RP FREUND, AK (reprint author), EUROPEAN SYNCHROTRON RADIAT FACIL,BP 220,F-38043 GRENOBLE,FRANCE. NR 19 TC 7 Z9 7 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 446 EP 449 DI 10.1063/1.1142726 PN 2A PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700039 ER PT J AU KHOUNSARY, AM AF KHOUNSARY, AM TI A NOVEL MONOCHROMATOR FOR HIGH HEAT LOAD SYNCHROTRON X-RAY-RADIATION SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS AB The high heat load associated with the powerful and concentrated x-ray beams generated by insertion devices (IDs) at a number of present and many of the future (planned or under construction) synchrotron radiation facilities poses a formidable engineering challenge for the design of monochromators and other optical devices. Successful utilization of the intense x-ray beams from insertion devices depends critically on the development, design, and availability of optical elements that provide acceptable performance under high heat load. Present monochromators can handle, at best, heat load levels that are an order of magnitude lower than those generated by these IDs. The monochromator described here, and referred to as the "inclined" monochromator, can provide a solution to the high heat load problem. The inclined monochromator is different in a number of aspects from other conventional monochromator designs. Its primary differentiating characteristic is in the orientation of the diffracting planes. In this geometry, the crystal surface normal and the normal to the diffracting crystal planes make an angle close to 90-degrees. This leads to a number of interesting effects including spreading of the beam over a very large area (effectively reducing the incident heat flux), and also rendering a much smaller effective slope error. Thus, a substantial enhancement in the performance of the monochromator is realized. The preliminary results of a comparative numerical simulation of the performance of the inclined monochromator under the 5-kW power undulator A beam at the Advanced Photon Source are encouraging and provide a quantitative estimate of the expected enhancement. RP KHOUNSARY, AM (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 5 TC 29 Z9 29 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 461 EP 464 DI 10.1063/1.1142732 PN 2A PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700043 ER PT J AU KNAPP, GS RAMANATHAN, M NIAN, HL MACRANDER, AT MILLS, DM AF KNAPP, GS RAMANATHAN, M NIAN, HL MACRANDER, AT MILLS, DM TI A SIMPLE SAGITTAL FOCUSING CRYSTAL WHICH UTILIZES A BIMETALLIC STRIP SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS ID X-RAY MONOCHROMATOR; SYNCHROTRON RADIATION AB A sagittal focusing monochromator which utilizes a bimetallic strip as its active focusing member has been designed and has undergone preliminary testing. The crystal bender is very easy to use as only setting the temperature of the bimetallic strip is necessary to adjust the focus. The mechanism utilizes bending rods mounted on live centers which prevent twisting based on the analysis, would have very small aberrations. RP KNAPP, GS (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 7 TC 3 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 465 EP 467 DI 10.1063/1.1142733 PN 2A PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700044 ER PT J AU KUZAY, TM AF KUZAY, TM TI CRYOGENIC COOLING OF X-RAY CRYSTALS USING A POROUS MATRIX SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS AB It is well established that Si and SiC have very desirable thermophysical properties (principally, high thermal conductivity, and low thermal expansion) at cryogenic temperatures. Thus, cryocooled optics are a potentially good candidate for the first optical crystal of the third generation synchrotron machines, which will have very high heat flux levels. Currently, there is a great deal of interest, both experimental and analytical in such cryocooled crystals. The analytical studies involve cut micro- or capillary channel crystals. As opposed to machined channels, porous matrices provide significant advantages. Such matrices are known to effect superior heat transfer. They operate very quietly. Data available in the open literature suggest that surface heat flux levels up to approximately 8 kW/cm2 are possible. For cryogens for which the boiling heat transfer heat flux is a rather low value in conventional geometries, the enhancement available with such matrices is very significant. Cryogens are poor thermal conductors themselves. At cryogenic temperatures, the Si and/or SiC matrix itself becomes highly conductive: Thus, the matrix distributes the surface heat flux into the full volume effectively offsetting the poor conductivity of the coolant. In addition, the tortuous path of the coolant through the matrix increases the dwell time resulting in better heat transfer, however, at the expense of an increased pressure drop. In this study, a first optics crystal model of Si with a Si and/or SiC porous matrix as its heat exchanger and subject to prototypic synchrotron loads is analyzed, and the feasibility limits of the cooling possible with liquid nitrogen in single phase are delineated. RP KUZAY, TM (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 11 TC 16 Z9 16 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 JAN PY 1992 VL 63 IS 1 BP 468 EP 472 DI 10.1063/1.1142734 PN 2A PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700045 ER PT J AU MAROT, G ROSSAT, M FREUND, A JOKSCH, S KAWATA, H ZHANG, L ZIEGLER, E BERMAN, L CHAPMAN, D HASTINGS, JB IAROCCI, M AF MAROT, G ROSSAT, M FREUND, A JOKSCH, S KAWATA, H ZHANG, L ZIEGLER, E BERMAN, L CHAPMAN, D HASTINGS, JB IAROCCI, M TI CRYOGENIC COOLING OF MONOCHROMATORS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS ID SYNCHROTRON RADIATION; MIRRORS AB In this paper, we report on the design and x-ray diffraction properties of cryocooled silicon single crystals exposed to the following wiggler beams: power density: 150 W/mm2, total power: 75 W and power density: 0.5 W/mm2, total power: 100 W. First, thermomechanical and engineering aspects of low-temperature crystal cooling are discussed, leading to two basic cooling geometries: internal cooling and side cooling. Experimental tests of both these cooling schemes at NSLS on beam lines X25 and X17 are then described and discussed. Finally, engineering problems related to the integration of cryogenic cooling on ESRF beam lines are presented. C1 DESY,HASYLAB,W-2000 HAMBURG 52,GERMANY. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP MAROT, G (reprint author), EUROPEAN SYNCHROTRON RADIAT FACIL,BP 200,F-38043 GRENOBLE,FRANCE. NR 12 TC 52 Z9 52 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 477 EP 480 DI 10.1063/1.1142736 PN 2A PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700047 ER PT J AU ZIEGLER, E MAROT, G FREUND, AK JOKSCH, S KAWATA, H BERMAN, LE IAROCCI, M AF ZIEGLER, E MAROT, G FREUND, AK JOKSCH, S KAWATA, H BERMAN, LE IAROCCI, M TI MULTILAYER OPTICS FOR INTENSE SYNCHROTRON X-RAY-BEAMS - RECENT RESULTS ON THEIR PERFORMANCE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS AB Present-day synchrotron x-ray beams are very demanding in terms of thermal, mechanical, and radiation stability of any optical element to be inserted in the beam. A set of multilayers was recently exposed and could resist to an x-ray power density in excess of 7.5 W/mm2, which is comparable to the one expected for the multilayers to be used at ESRF. Such a power density was obtained by setting the multilayers at a grazing angle of about 2-degrees in a focused wiggler beam of 4.6 keV critical energy. The specimen, W/B4C and W/Si multilayers, were cooled either at room temperature or down to liquid nitrogen temperature during an 8-16 h exposure time. C1 BROOKHAVEN NATL LAB,NATL SYNCHROTON LIGHT SOURCE,UPTON,NY 11973. DESY,HAMBURGER SYNCHROTRONSTRAHLUNGS LAB,W-2000 HAMBURG 52,GERMANY. RP ZIEGLER, E (reprint author), EUROPEAN SYNCHROTRON RADIAT FACIL,BP 220,F-38043 GRENOBLE,FRANCE. NR 12 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 496 EP 500 DI 10.1063/1.1142690 PN 2A PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700052 ER PT J AU HULBERT, SL AF HULBERT, SL TI INTERACTION OF INGA LIQUID ALLOY COOLANT WITH GOLD-COATED OPTICAL-MATERIALS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS AB A significant reaction is reported between gold surfaces and an indium-gallium eutectic liquid alloy often used to transfer heat away from optical elements in high power synchrotron radiation beam lines. This reaction proceeds at the slightly elevated temperatures (70-degrees-C) typical of conservative bakeouts used to achieve ultrahigh vacuum in the chambers which house these optical elements (mirrors, gratings, and crystals) without damaging their highly precise figure and finish. The nature and extent of this reaction is discussed, based mostly on the experience gained recently during the vacuum commissioning of two mirror chambers for a VUV wiggler-based synchrotron radiation beam line. RP HULBERT, SL (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 2 TC 4 Z9 4 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 505 EP 508 DI 10.1063/1.1142692 PN 2A PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700054 ER PT J AU JOHNSON, ED FAUCHET, AM ZHANG, XH AF JOHNSON, ED FAUCHET, AM ZHANG, XH TI CORRELATION OF PHOTON-BEAM MOTION WITH VACUUM CHAMBER COOLING ON THE NSLS X-RAY RING SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS ID POSITION MONITOR; SYNCHROTRON RADIATION AB The NSLS x-ray ring exhibits a direct correlation between photon beam motion, and distortion of the ring vacuum chamber induced by fluctuations in the cooling system. We have made long term measurements of photon beam vertical position, accelerator vacuum chamber motion, process water temperatures, and angular motions of the magnets around one superperiod of the NSLS x-ray ring. Short term transients in water temperature cause deflection of the ring vacuum chamber which have in turn been shown to induce very small angular rotations of the magnets, on the order of 10-mu-rad. A larger and more difficult to correct effect is the drift in beam position over the course of a fill. This problem has been shown to be related to the thermal gradients that develop across the vacuum chamber which, as a consequence of the configuration of the chamber cooling, depend upon stored current. Orbit simulations based upon the measured rotations are in agreement with the observed beam motions, and reveal that certain patterns of correlated motions of the magnets can produce much larger errors than random motion or concerted motion of all the magnets. During the course of these measurements global orbit feedback was installed, and found to significantly reduce the orbit errors which could not be corrected at their source. RP JOHNSON, ED (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 30 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 JAN PY 1992 VL 63 IS 1 BP 513 EP 518 DI 10.1063/1.1143821 PN 2A PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700056 ER PT J AU KARLIN, BA COWAN, PL WOICIK, JC AF KARLIN, BA COWAN, PL WOICIK, JC TI X-RAY, SOFT-X-RAY, AND VUV BEAM POSITION MONITOR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS ID SYNCHROTRON RADIATION BEAMLINE; HIGH-ENERGY-RESOLUTION; PHOTOELECTRON; DETECTORS AB An x-ray beam position monitor has been developed and is currently operational at the NIST beam line X-24A of the National Synchrotron Light Source. It was developed to accurately measure the vertical position of the synchrotron beam and to allow precise positioning of beam line optics. It is an area-type monitor positioned 5.6 m from the tangent point and precedes all beam line instrumentation. Vertical beam position is given by the differential photoemission current from two grids mounted on a Macor frame. The monitor also senses the total photon beam flux. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP KARLIN, BA (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 9 TC 4 Z9 4 U1 2 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 526 EP 529 DI 10.1063/1.1142696 PN 2A PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700059 ER PT J AU PERERA, RCC MELCZER, ME WARWICK, A JACKSON, A KINCAID, BM AF PERERA, RCC MELCZER, ME WARWICK, A JACKSON, A KINCAID, BM TI DIAGNOSTIC BEAMLINE FOR A 3RD GENERATION STORAGE RING SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID PROGRAM AB A knowledge of the position, size, and stability of the source and the angle of emission of synchrotron radiation (SR) from the storage ring are essential for optimizing the operation of storage ring, insertion devices and monochromators. Berkeley's Advanced Light Source (ALS) has a natural emittance of 3.4 x 10(-9) mrad, and has beam sizes sigma(h) and sigma(upsilon) (assuming a 10% emittance ratio into the vertical direction) in bending magnet 1 (BM1) of 44 and 83-mu-m, respectively. Simple diffractive optical calculations show that imaging this beam using visible light optics is not feasible and imaging must be performed using photon energies greater than 50 eV. This will be the same for all third generation low emittance storage rings. The synchrotron radiation diagnostics at ALS will consist of an imaging system for 200 eV photons and a "white beam" port with a streak camera to obtain the timing information. The imaging system will employ two crossed spherical mirrors in a Kirkpatrick-Baez configuration, to eliminate astigmatism. Use of 1:1 imaging will eliminate coma, resulting in an image of the source which is only limited by the residual aberrations of the optics. Real time imaging of the beam is deemed feasible by the use of a high resolution charged coupled device (CCD), and the associated electronics necessary to read the CCD. The design of the imaging system of the diagnostic beamline for ALS and the detection system will be discussed with a view toward applications in other third generation SR sources. RP PERERA, RCC (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 6 TC 2 Z9 2 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 541 EP 544 DI 10.1063/1.1142700 PN 2A PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700063 ER PT J AU SHU, DM WARWICK, T JOHNSON, ED AF SHU, DM WARWICK, T JOHNSON, ED TI DIAGNOSTIC PHOSPHORS FOR PHOTON BEAMS AT THE ALS AND APS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS AB Some tests have been made of phosphors for photon beam diagnosis. Plasma-sprayed coatings were checked for damage and decay during a period of several ampere hours of irradiation from the x-ray ring at the National Synchrotron Light Source. Surface temperatures were measured and extrapolated to give an indication of the temperatures expected in more powerful photon beams. Based on our findings we have chosen plasma-sprayed coatings of europium-doped yttrium oxide as the best candidate for use on masks and flags in "white" photon beams of the new facilities. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP SHU, DM (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 548 EP 549 DI 10.1063/1.1142702 PN 2A PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700065 ER PT J AU WARWICK, T SHU, DM RODRICKS, B JOHNSON, ED AF WARWICK, T SHU, DM RODRICKS, B JOHNSON, ED TI PROTOTYPE PHOTON POSITION MONITORS FOR UNDULATOR BEAMS AT THE ADVANCED LIGHT-SOURCE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS AB Design criteria are described, and test results are presented, for prototype undulator beam position monitors at the Advanced Light Source (ALS). The design is based on monitors presently in use at the National Synchrotron Light Source, Brookhaven National Laboratory, with modifications to account for the widely varying and large K values of the undulators to be installed at the ALS. In particular, we have modified the design to simplify the thermal engineering and we have explored techniques to suppress the response of the monitors to soft photons, below 100 eV, so that the beam position can be determined by measuring the higher energy photons which are better collimated. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP WARWICK, T (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 4 TC 11 Z9 11 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 JAN PY 1992 VL 63 IS 1 BP 550 EP 553 DI 10.1063/1.1142703 PN 2A PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700066 ER PT J AU KIRZ, J ADE, H JACOBSEN, C KO, CH LINDAAS, S MCNULTY, I SAYRE, D WILLIAMS, S ZHANG, X HOWELLS, M AF KIRZ, J ADE, H JACOBSEN, C KO, CH LINDAAS, S MCNULTY, I SAYRE, D WILLIAMS, S ZHANG, X HOWELLS, M TI SOFT-X-RAY MICROSCOPY WITH COHERENT X-RAYS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS ID PHOTOELECTRON MICROSCOPY; SYNCHROTRON RADIATION; ZONE PLATES; SPECTROSCOPY; RESOLUTION AB The Soft X-ray Undulator beamline at the NSLS supports a soft x-ray imaging program including scanning transmission microscopy, scanning photoemission microscopy, Gabor and Fourier transform holography, and large angle diffraction. Zone plates from an LBL Center for X-ray Optics/IBM collaboration are used as optical elements. The current instrumentation of the beamline and the experimental stations is discussed, along with plans for the future at the NSLS and prospects for imaging programs at third generation sources. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,ALS,BERKELEY,CA 94720. RP KIRZ, J (reprint author), SUNY STONY BROOK,DEPT PHYS,STONY BROOK,NY 11794, USA. RI Ade, Harald/E-7471-2011; Jacobsen, Chris/E-2827-2015 OI Jacobsen, Chris/0000-0001-8562-0353 NR 56 TC 38 Z9 38 U1 0 U2 12 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 JAN PY 1992 VL 63 IS 1 BP 557 EP 563 DI 10.1063/1.1142705 PN 2A PG 7 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700068 ER PT J AU YUN, WB VICCARO, PJ LAI, B CHRZAS, J AF YUN, WB VICCARO, PJ LAI, B CHRZAS, J TI COHERENT HARD X-RAY FOCUSING OPTICS AND APPLICATIONS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS ID ZONE PLATES; RESOLUTION AB Coherent hard x-ray beams with a flux exceeding 10(9) photons/sec with a bandwidth of 0.1% will be provided by undulators at the third-generation synchrotron radiation sources such as APS, ESRF, and Spring-8. The availability of such high flux coherent x-ray beams offers excellent opportunities for extending the coherence-based techniques developed in the visible and soft x-ray part of the electromagnetic spectrum to the hard x-ray region. These x-ray techniques (e.g., diffraction-limited microfocusing, holography, interferometry, phase contrast imaging, and signal enhancement) may offer substantial advantages over noncoherence-based x-ray techniques currently used. For example, the signal-enhancement technique may be used to enhance an anomalous x-ray or magnetic x-ray scattering signal by several orders of magnitude. Coherent x rays can be focused to a very small (diffraction-limited) spot size, thus allowing construction of high spatial resolution microprobes. This paper will discuss the feasibility of extending some coherence-based techniques to the hard x-ray range and the significant progress that has been made in the development of diffraction-limited focusing optics. Specific experimental results for a transmission Fresnel phase zone plate that can focus 8.2 keV x rays to a spot size of about 2 microns will be briefly discussed. The comparison of measured focusing efficiency of the zone plate with that calculated will be made. Some specific applications of zone plates as coherent x-ray optics will be discussed. RP YUN, WB (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 20 TC 35 Z9 36 U1 1 U2 5 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 JAN PY 1992 VL 63 IS 1 BP 582 EP 585 DI 10.1063/1.1142711 PN 2A PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700073 ER PT J AU GARRETT, RF DILMANIAN, FA OVERSLUIZEN, T LENHARD, A BERMAN, LE CHAPMAN, LD STOEBER, W AF GARRETT, RF DILMANIAN, FA OVERSLUIZEN, T LENHARD, A BERMAN, LE CHAPMAN, LD STOEBER, W TI A HIGH-ENERGY DOUBLE-CRYSTAL FIXED EXIT MONOCHROMATOR FOR THE X17 SUPERCONDUCTING WIGGLER BEAM LINE AT THE NSLS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS ID X-RAY MONOCHROMATOR; SYNCHROTRON RADIATION; SYSTEM AB A high-energy double-crystal x-ray monochromator has been constructed for use on the X-17 beam line at the National Synchrotron Light Source (NSLS). Its design is based on the "boomerang" right angle linkage, and features a fixed exit beam, a cooled first crystal, and an energy range of 8-92 keV. The entire mechanism is UHV compatible. The design is described and performance details, obtained in testing at the X17 beam line, are presented. C1 BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. NR 13 TC 6 Z9 6 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 595 EP 598 DI 10.1063/1.1142714 PN 2A PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700077 ER PT J AU THOMLINSON, W GMUR, N CHAPMAN, D GARRETT, R LAZARZ, N MOULIN, H THOMPSON, AC ZEMAN, HD BROWN, GS MORRISON, J REISER, P PADMANABAHN, V ONG, L GREEN, S GIACOMINI, J GORDON, H RUBENSTEIN, E AF THOMLINSON, W GMUR, N CHAPMAN, D GARRETT, R LAZARZ, N MOULIN, H THOMPSON, AC ZEMAN, HD BROWN, GS MORRISON, J REISER, P PADMANABAHN, V ONG, L GREEN, S GIACOMINI, J GORDON, H RUBENSTEIN, E TI 1ST OPERATION OF THE MEDICAL-RESEARCH FACILITY AT THE NSLS FOR CORONARY ANGIOGRAPHY SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS ID SYNCHROTRON RADIATION AB The Synchrotron Medical Research Facility (SMERF) at the National Synchrotron Light Source has been completed and is operational for human coronary angiography experiments. The imaging system and hardware have been brought to SMERF from the Stanford Synchrotron Radiation Laboratory where prior studies were carried out. SMERF consists of a suite of rooms at the end of the high-field superconducting wiggler X17 beam line and is classified as an Ambulatory Health Care Facility. Since October of 1990 the coronary arteries of five patients have been imaged. Continuously improving image quality has shown that a large part of both the right coronary artery and the left anterior descending coronary artery can be imaged following a venous injection of contrast agent. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR XRAY OPT,BERKELEY,CA 94720. STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94305. N SHORE UNIV HOSP,MANHASSET,NY 11030. UNIV TENNESSEE CTR HLTH SCI,DEPT BIOMED ENGN,MEMPHIS,TN 38163. VET ADM MED CTR,PALO ALTO,CA 94305. STANFORD UNIV,STANFORD,CA 94305. RP THOMLINSON, W (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Elleaume, Helene/F-2554-2013; Chapman, Dean/I-6168-2013 OI Chapman, Dean/0000-0001-6590-4156 NR 16 TC 68 Z9 68 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 625 EP 628 DI 10.1063/1.1142672 PN 2A PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700086 ER PT J AU LOWE, W CLARKE, R DOSPASSOS, W RODRICKS, B BRIZARD, C AF LOWE, W CLARKE, R DOSPASSOS, W RODRICKS, B BRIZARD, C TI REAL-TIME X-RAY STUDIES OF RAPIDLY ANNEALED EPITAXIAL LAYERS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS ID SUPERLATTICES; RELAXATION AB Time-resolved x-ray scattering studies of epitaxial overlayers are presented. The results illustrate the usefulness of high-brightness synchrotron probes for studying the cooperative kinetics of interfaces during rapid thermal processing. C1 UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109. ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439. RP LOWE, W (reprint author), AT&T BELL LABS,N ANDOVER,MA 01845, USA. NR 10 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 704 EP 706 DI 10.1063/1.1142642 PN 2A PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700107 ER PT J AU CLARKE, R LOWE, WP MACHARRIE, RA BRIZARD, C RODRICKS, BG AF CLARKE, R LOWE, WP MACHARRIE, RA BRIZARD, C RODRICKS, BG TI SYNCHROTRON RADIATION APPLICATIONS OF CHARGE COUPLED DEVICE DETECTORS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS ID CCD AB Scientific charge coupled devices (CCDs) offer many opportunities for high brightness synchrotron radiation applications where good spatial resolution and fast data acquisition are important. We describe the use of virtual-phase CCD pixel arrays as two-dimensional area detectors illustrating the techniques with results from recent x-ray scattering, imaging, and absorption spectroscopy studies at NSLS, CHESS, SRC, and LURE DCI. The virtual phase architecture allows direct frontside illumination of the CCD detector chips giving advantages in the speed and sensitivity of the detector. Combining developments in x-ray optics (dispersive geometry), position sensitive area detectors (CCDs), and fast data acquisition, we have been able to perform time-resolved measurements at the microsecond level. Current developments include faster data transfer rates so that the single bunch timing structure of third generation synchrotron sources can be exploited. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. ARGONNE NATL LAB,ARGONNE,IL 60439. RP CLARKE, R (reprint author), UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109, USA. NR 18 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 784 EP 789 DI 10.1063/1.1142662 PN 2A PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700125 ER PT J AU BRIZARD, C RODRICKS, B AF BRIZARD, C RODRICKS, B TI PROGRAMMABLE CCD IMAGING-SYSTEM FOR SYNCHROTRON RADIATION STUDIES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS AB A real-time imaging system for x-ray detection has been developed. The Computer Automated Measurement and Control (CAMAC)-based system has a charge coupled device (CCD) as its active detection element. The electronics consists of a CAMAC crate based dedicated microprocessor coupled to arbitrary wave form generators, programmable timing and analog-to-digital converter modules. The hardware flexibility achievable through this system enables us to use virtually any commercially available CCD. A dedicated CAMAC-based display driver allows for real-time imaging on a high-resolution color monitor. An optional front end consisting of a fibre-optic taper and a focusing optical lens system coupled to a phosphor screen allows for large area imaging. Further, programming flexibility, where the detector can be used in different readout modes, enables it to be exploited for time-resolved experiments. In one mode, sections of the CCD can be readout with millisecond time resolution and in another, the use of the CCD as a storage device is exploited resulting in microsecond time resolution. Three different CCDs with radically different readout timings and waveforms have been tested. The CCD characterized for uniformity, charge transfer efficiency, linearity and sensitivity is the TC215. RP BRIZARD, C (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 11 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 802 EP 805 DI 10.1063/1.1142613 PN 2A PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700129 ER PT J AU BRENNAN, S COWAN, PL AF BRENNAN, S COWAN, PL TI A SUITE OF PROGRAMS FOR CALCULATING X-RAY ABSORPTION, REFLECTION, AND DIFFRACTION PERFORMANCE FOR A VARIETY OF MATERIALS AT ARBITRARY WAVELENGTHS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS AB One of the most useful characteristics of synchrotron radiation is the wide spectral distribution of the source. For applications involving tuned monochromatic beams it is often helpful to predict the x-ray optical characteristics of a sample or the beam line optics at a particular wavelength. In contrast to this desire stands the fact that tabulated values for the optical parameters of interest are generally available only at wavelengths corresponding to typical x-ray tube sources. We have developed a suite of FORTRAN programs which calculate photoabsorption cross sections and atomic scattering factors for materials of arbitrary, uniform composition or for arbitrary layered materials. Further, the suite includes programs for calculation of x-ray diffraction or reflection from such materials. These programs are of use for experimental planning, data analysis, and predictions of performance of beam line optical elements. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP BRENNAN, S (reprint author), STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309, USA. NR 13 TC 189 Z9 191 U1 0 U2 8 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 JAN PY 1992 VL 63 IS 1 BP 850 EP 853 DI 10.1063/1.1142625 PN 2A PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700141 ER PT J AU COX, AD AF COX, AD TI THE SSRL BEAMLINE DATA ACQUISITION-SYSTEMS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND SP SCI & ENGN RES COUNCIL, EUROPEAN ECON COMMUNITY, EUROPEAN SYNCHROTRON RADIAT FACIL, EUROPEAN SYNCHROTRON RADIAT SOC, NETHERLANDS ORG SCI RES, DARESBURY RES SERV, ICI, OXFORD INSTRUMENTS, RANK XEROX, CARL ZEISS AB SSRL has recently returned to extended running following the successful commissioning of a dedicated injector, and operation of the SPEAR storage ring exclusively for synchrotron radiation research. During the hiatus, the entire beamline data acquisition systems at the laboratory have been upgraded and extended to provide a more consistent, capable, and flexible interface to synchrotron users. Currently, 20 beamline stations have been commissioned, and planning is in the advanced stage to convert the remaining three beamline stations to use the new software set. This article outlines the design goals, implementation strategies, and capabilities of the new systems. RP COX, AD (reprint author), STANFORD LINEAR ACCELERATOR CTR,STANFORD SYNCHROTRON RADIAT LAB,POB 4349,BIN 69,STANFORD,CA 95309, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 854 EP 855 DI 10.1063/1.1142626 PN 2A PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ627 UT WOS:A1992GZ62700142 ER PT J AU HEALD, SM AF HEALD, SM TI EXAFS AT GRAZING-INCIDENCE - DATA-COLLECTION AND ANALYSIS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND ID X-RAY REFLECTIVITY; ABSORPTION FINE-STRUCTURE; GLANCING ANGLE EXAFS; SURFACE EXAFS; INTERFACES; REGIONS AB Extended x-ray absorption fine structure (EXAFS) at grazing incidence can be applied to a large variety of surface and interface problems. This paper discusses in detail the collection and analysis of such data using interface EXAFS from metal/Al bilayers as an example. A comparison of the fluorescence and reflectivity detection channels is given, along with a discussion of the methods for correction of anomalous dispersion distortions. In addition, data from a Ni-Ti multilayer is used to demonstrate the potential of enhancing the sensitivity of the EXAFS signal to selected regions using standing wave effects. RP HEALD, SM (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 23 TC 16 Z9 17 U1 0 U2 5 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 JAN PY 1992 VL 63 IS 1 BP 873 EP 878 DI 10.1063/1.1142632 PN 2B PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300001 ER PT J AU LAMBLE, GM HEALD, SM AF LAMBLE, GM HEALD, SM TI OPERATION OF A DYNAMICALLY BENT SAGITTALLY FOCUSING DOUBLE CRYSTAL MONOCHROMATOR FOR XAFS STUDIES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND ID X-RAY ABSORPTION; SYNCHROTRON RADIATION; NSLS AB The X-11A beamline at the NSLS has been upgraded to include a dynamic sagitally focusing second crystal in the monochromator, currently operating in the range 5.5-11 keV. The monochromator maintains a constant focus at the sample by adjustment of the bent crystal radius during the XAFS scan. The monochromator accepts 3.3 mrad of horizontal radiation and a spot size of approximately 1.5 mm2 is achieved at the sample. The sagittally focusing mechanism in the monochromator is described and the results are presented of intensity profiles, spatial stability, and energy resolution between the energy ranges 6 and 10 keV, where the system performs most favorably. Intensity gains over unfocused operation are substantial and XAFS studies of dilute fluorescence samples reveal the expected S/N improvements, without any introduction of additional noise from the bending process. The mechanism operates with close to 100% efficiency between the energy ranges 6 and 8 keV. Bending errors hinder the performance at higher energies and also preclude effective harmonic rejection, by piezocrystal detuning, over the entire energy range. RP LAMBLE, GM (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 4 TC 15 Z9 15 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 880 EP 884 DI 10.1063/1.1142634 PN 2B PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300002 ER PT J AU CHAPMAN, D MOULIN, H GARRETT, RF AF CHAPMAN, D MOULIN, H GARRETT, RF TI MONOCHROMATOR HARMONIC CONTENT MEASUREMENTS AND CALCULATIONS AT ENERGIES ABOVE 20-KEV SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND AB Measurements of the harmonic content from single- and double-crystal silicon monochromators have been made in the 20- to 100-keV range at the X17 superconducting wiggler beam line at the NSLS. These measurements are compared with calculations which estimate the monochromatic beam harmonic content and the detection system efficiency with good agreement. At high photon energies (> 20 keV), the scattering of x rays from an amorphous scatterer is dominated by the inelastic Compton process. At large scattering angles this will completely overwhelm the more forward directed elastic scattering. The Compton x-ray energy shift is large enough to make the distinction between elastic and Compton scattering unambigous when a spectrum is acquired with a solid-state detector. This shift, which is energy dependent, allows the measurement of the relative harmonic intensity in a way that is not affected by pulse pileup in the detector and electronics. The present measurements were done to assess the level of harmonic contamination from two monochromator systems both used on the X17 beam line: the single-crystal-type monochromator for the digital subtraction coronary angiography project; and the double-crystal monochromator being developed for the multiple energy computed tomography (MECT) project and the Materials Science program. C1 BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. RP CHAPMAN, D (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. RI Elleaume, Helene/F-2554-2013 NR 5 TC 3 Z9 3 U1 0 U2 2 PU 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 JAN PY 1992 VL 63 IS 1 BP 893 EP 895 DI 10.1063/1.1143769 PN 2B PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300005 ER PT J AU BRENNAN, S AF BRENNAN, S TI A DATA-COLLECTION PROGRAM FOR X-RAY-DIFFRACTOMETRY SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND AB A computer program for controlling diffractometers is described. At present it is capable of controlling a four-circle diffractometer in a variety of calculation modes, a two-circle diffractometer, and also a z-axis diffractometer. The program includes on-screen plotting of both the current scan and previous scans. There is a separate program which consists of the plotting subset of the commands so that while one user is collecting data other users can be analyzing old data simultaneously. Extensive on-line help is provided. The program is written in FORTRAN, runs on the VMS operating system, and is primarily dependent on CAMAC for data collection. RP BRENNAN, S (reprint author), STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309, USA. NR 7 TC 2 Z9 2 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 992 EP 994 DI 10.1063/1.1143718 PN 2B PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300028 ER PT J AU KNAPP, GS BENO, MA AF KNAPP, GS BENO, MA TI A NEW METHOD TO DO TIME-RESOLVED, X-RAY-DIFFRACTION STUDIES - THE ROTATING CRYSTAL LAUE METHOD SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND AB In order to achieve the ultimate time resolution of a synchrotron source we propose a new experimental technique by which time-dependent structural changes can be monitored on the time scale of synchrotron pulse widths. Samples will be studied by a rotating crystal Laue diffraction technique where we rapidly spin the sample and observe the diffraction pattern from a broadband of incident x rays. A computer simulation is presented of the diffraction pattern time evolution using the parameters for an APS undulator of a phase change in the YBa2Cu3O7-x superconductor. We will discuss the application of this and closely related techniques at other synchrotron sources including bending magnets and insertion devices at NSLS and CHESS. RP KNAPP, GS (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 13 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 1032 EP 1034 DI 10.1063/1.1143191 PN 2B PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300039 ER PT J AU JOKSCH, S GRAEFF, W HASTINGS, JB SIDDONS, DP AF JOKSCH, S GRAEFF, W HASTINGS, JB SIDDONS, DP TI PERFORMANCE OF AN X-RAY OPTICAL-TIME DELAY-LINE WITH SYNCHROTRON RADIATION SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND AB We describe pump-probe experiments in the x-ray region using synchrotron radiation to supply both the pump and probe beams. The time between pump and probe is adjustable on the nanosecond time scale by means of an optical delay line operating in the x-ray region. With the "third generation" sources presently under construction around the world it should be practicable to study optical excitations using similar techniques to those described here. The initial studies we describe were carried out at the National Synchrotron Light Source. A 30-mu-m-thick silicon [110] crystal was irradiated by white light from a bending magnet. The radiation passing through this sample was monochromated by two silicon [660] reflections in such a way that the monochromatic beam was directed onto the first surface of the thin crystal sample. The surface of this thin crystal was probed by recording the symmetric (220) reflexion 2.78 ns after illumination by the white beam. Techniques for overcoming the background problem resulting from scattering of the white beam by the sample crystal are discussed. C1 BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP JOKSCH, S (reprint author), DESY,HAMBURGER SYNCHROTRONSTRAHLUNGSLAB,NOTKESTR 85,W-2000 HAMBURG 52,GERMANY. NR 13 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 1114 EP 1118 DI 10.1063/1.1143110 PN 2B PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300061 ER PT J AU STOJANOFF, V HAMALAINEN, K SIDDONS, DP HASTINGS, JB BERMAN, LE CRAMER, S SMITH, G AF STOJANOFF, V HAMALAINEN, K SIDDONS, DP HASTINGS, JB BERMAN, LE CRAMER, S SMITH, G TI A HIGH-RESOLUTION X-RAY-FLUORESCENCE SPECTROMETER FOR NEAR-EDGE ABSORPTION STUDIES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND AB A high-resolution fluorescence spectrometer using a Johann geometry in a backscattering arrangement was developed. The spectrometer, with a resolution of 0.3 eV at 6.5 keV, combined with an incident beam, with a resolution of 0.7 eV, form the basis of a high-resolution instrument for measuring x-ray absorption spectra. The advantages of the instrument are illustrated with the near-edge absorption spectrum of dysprosium nitrate. RP STOJANOFF, V (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. RI Hamalainen, Keijo/A-3986-2010; stojanoff, vivian /I-7290-2012 OI Hamalainen, Keijo/0000-0002-9234-9810; stojanoff, vivian /0000-0002-6650-512X NR 10 TC 54 Z9 54 U1 2 U2 15 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 JAN PY 1992 VL 63 IS 1 BP 1125 EP 1127 DI 10.1063/1.1143112 PN 2B PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300063 ER PT J AU PAYNE, AP CLEMENS, BM BRENNAN, S AF PAYNE, AP CLEMENS, BM BRENNAN, S TI AN APPARATUS FOR STUDYING SPUTTER DEPOSITION WITH X-RAYS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND AB While electron-based structural probes have been extensively applied to low-pressure film growth techniques such as evaporation, similar studies on sputter deposition have been hindered by the relatively high gas pressure (1-10 mT) inherent to the technique. Because x rays scatter more weakly than electrons the absorption in the ambient is not significant and diffraction from the growing film can be observed if a sufficiently bright source of x rays is used. We have developed a chamber which combines features of an ultrahigh-vacuum sputter-deposition system with the goniometric adjustments and the x-ray windows of a scattering chamber. A description of its design and recent results are presented. C1 STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. RP PAYNE, AP (reprint author), STANFORD UNIV,DEPT MAT,STANFORD,CA 94305, USA. NR 3 TC 18 Z9 18 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 1147 EP 1149 DI 10.1063/1.1143117 PN 2B PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300068 ER PT J AU NORRIS, JR BOWMAN, MK CHEN, L TANG, J THURNAUER, MC KNAPP, GS MONTANO, PA AF NORRIS, JR BOWMAN, MK CHEN, L TANG, J THURNAUER, MC KNAPP, GS MONTANO, PA TI A SHUTTER DESIGN FOR TIME DOMAIN STUDIES USING SYNCHROTRON RADIATION AT THE ADVANCED PHOTON SOURCE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND ID RESOLVED X-RAY AB In general, a variable repetition rate of the x-ray bunches is needed to explore time domain problems using x-rays. In some instances, the results of several hundreds or thousands of x-ray pulses must be averaged requiring the sample to be in the same time-dependent state each time the monitoring pulse strikes. The important point is that before a second x-ray pulse hits the sample, the system must return to its initial relaxed ground state prior to another spectrum pulse in order to prepare the same excited state again. Our key design principle employs a subsonic, rotating mirror whose period is slaved to the synchrotron intrapulse period. The synchrotron x-ray bunches will be reflected a distance of about 2 m to a narrow 0.5-mm slit just in front of the sample. A mirror rotating at a low 7500 rpm (125 Hz) is sufficient to select a single synchrotron pulse for the Advanced Photon Source. The very precise phase stability required by this method is currently available in rotating mirror devices for laser scanning. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP NORRIS, JR (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. RI Bowman, Michael/F-4265-2011; Tang, Jau/D-8382-2012 OI Bowman, Michael/0000-0003-3464-9409; Tang, Jau/0000-0003-2078-1513 NR 11 TC 4 Z9 4 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 1172 EP 1175 DI 10.1063/1.1143125 PN 2B PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300075 ER PT J AU SHAM, TK KRISTOF, P HOLROYD, RA AF SHAM, TK KRISTOF, P HOLROYD, RA TI PHOTOCONDUCTIVITY AND LUMINESCENCE MEASUREMENTS IN LIQUIDS EXPOSED TO 4-6-KEV X-RAYS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND ID ABSORPTION-SPECTRA AB Conductivity measurements have been made on liquid hydrocarbons and solutions of tetramethyltin in hydrocarbons exposed to 4-6-keV x rays. It is found that although the free ion yield of the pure liquid at 6-keV photon energy is in agreement with previous measurements the ion yields at x-ray energies below 6 keV are lower than predicted by theory. The ionization current at the Sn L3 edge of solutions of tetramethyltin in 2,2,4,4-trimethylpentane (TMP) and toluene exhibits an inverted edge jump at various concentrations as expected from theory. Luminescence yield at the Sn L3 edge for a solution of tetramethyltin in toluene also exhibits the same inversion behavior, in general accord with previous results and the current understanding of edge jump behavior studies in liquids. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RP SHAM, TK (reprint author), UNIV WESTERN ONTARIO,DEPT CHEM,LONDON N6A 5B7,ONTARIO,CANADA. NR 9 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 1198 EP 1200 DI 10.1063/1.1143081 PN 2B PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300081 ER PT J AU ALP, EE RAMANATHAN, M SALEMSUGUI, S OLIVER, F STOJANOFF, V SIDDONS, DP AF ALP, EE RAMANATHAN, M SALEMSUGUI, S OLIVER, F STOJANOFF, V SIDDONS, DP TI X-RAY DICHROISM AND FARADAY-EFFECT STUDIES IN ORDERED AND DISORDERED FE3PT SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND ID SPIN-DEPENDENT ABSORPTION; IRON; L2,3-EDGES; ALLOY AB The magnetic properties of Fe3Pt compound depend on the degree of disorder present in the system. We have compared a cold-rolled, disordered sample with a heat treated, ordered sample using circularly polarized synchrotron radiation at the Fe K (7112 eV) and at the Pt L3 (11 564 eV) absorption edge, as well as by Mossbauer spectroscopy, and x-ray diffraction. Fe-K edge dichroism is compared to the measurements of Faraday rotation using linearly polarized radiation. We found that the magnitude of magnetic dichroism at the Pt L3 edge is reduced when the disordered Fe3Pt is heat treated and ordered. The enhanced sensitivity of the Faraday rotation measurements compared to the magnetic dichroism measurements at the K edges of transition metals are reported on. C1 MORGAN STATE UNIV,BALTIMORE,MD 21239. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP ALP, EE (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI stojanoff, vivian /I-7290-2012 OI stojanoff, vivian /0000-0002-6650-512X NR 14 TC 10 Z9 10 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 1221 EP 1224 DI 10.1063/1.1143808 PN 2B PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300088 ER PT J AU LEE, WK MILLS, DM AF LEE, WK MILLS, DM TI COUNTING STATISTICS AND LOSS CORRECTIONS FOR THE APS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND AB It has been suggested that for timing experiments, it might be advantageous to arrange the bunches in the storage ring in an asymmetrical mode. In this paper, we determine the counting losses from pulsed x-ray sources from basic probabilistic arguments and from Poisson statistics. In particular the impact on single-photon counting losses of a variety of possible filling modes for the Advanced Photon Source (APS) is examined. For bunches of equal current, a loss of 10% occurs whenever the count rate exceeds 21% of the bunch repetition rate. This changes slightly when bunches containing unequal numbers of particles are considered. The results are applied to several common detector/electronics systems. RP LEE, WK (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 3 TC 8 Z9 8 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 1225 EP 1228 DI 10.1063/1.1143088 PN 2B PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300089 ER PT J AU JOHNSON, ED FREEMAN, J POWELL, F AF JOHNSON, ED FREEMAN, J POWELL, F TI COMPACT UHV VALVE WITH FIELD REPLACEABLE WINDOWS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND AB There are many applications in synchrotron radiation research where window valves can be usefully employed. Examples include gas cells for monochromator calibration, filters for high-order light rejection, and as vacuum isolation elements between machine and experimental vacua. Often these devices are fairly expensive, and have only fixed (i.e., nonremovable) windows. The development of a new type of seal technology by VAT for their series 01 valves provides a gate surface which is free from obstructions due to internal mechanical elements. This feature allows a threaded recess to be machined into the gate to receive a removable window frame which can carry standard size Luxel thin-film windows. The combination of these features results in a DN 40 (2.75-in. conflat flange) valve which provides a clear aperture of 21-mm diameter for the window material. C1 VAT INC,WOBURN,MA 01810. LUXEL CORP,FRIDAY HARBOR,WA 98250. RP JOHNSON, ED (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 3 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 1282 EP 1284 DI 10.1063/1.1143100 PN 2B PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300101 ER PT J AU OVERSLUIZEN, T STOEBER, W JOHNSON, ED AF OVERSLUIZEN, T STOEBER, W JOHNSON, ED TI KINEMATIC MOUNTING SYSTEMS FOR NATIONAL SYNCHROTRON LIGHT-SOURCE BEAMLINES AND EXPERIMENTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB Methods for kinematically mounting equipment are well established, but applications at synchrotron radiation facilities are subject to constraints not always encountered in more traditional laboratory settings. Independent position adjustment of beamline components can have significant benefits in terms of minimizing time spent aligning, and maximizing time spent acquiring data. In this article, we use examples taken from beamlines at the National Synchrotron Light Source to demonstrate approaches for optimization of the reproducibility, stability, excursion, and set-up time for various situations. From our experience, we extract general principles which we hope will be useful for workers at other synchrotron radiation facilities. RP OVERSLUIZEN, T (reprint author), BROOKHAVEN NATL LAB, NATL SYNCHROTRON LIGHT SOURCE, UPTON, NY 11973 USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 1285 EP 1288 DI 10.1063/1.1143101 PN 2B PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300102 ER PT J AU RANDALL, KJ FELDHAUS, J ERLEBACH, W BRADSHAW, AM EBERHARDT, W XU, Z MA, Y JOHNSON, PD AF RANDALL, KJ FELDHAUS, J ERLEBACH, W BRADSHAW, AM EBERHARDT, W XU, Z MA, Y JOHNSON, PD TI SOFT-X-RAY SPECTROSCOPY BEAM LINE ON THE NSLS X1 UNDULATOR - OPTICAL DESIGN AND 1ST PERFORMANCE TESTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND ID K-SHELL EXCITATION; ENERGY-LOSS SPECTROSCOPY; SYNCHROTRON RADIATION; N2; MOLECULE; CARBON; CO AB The layout and first data on the performance of the soft x-ray undulator beam line on the x-ray ring at Brookhaven are described. The undulator (X1) has 35 periods of 8 cm, resulting in a tuning range for the fundamental of about 200-700 eV at the nominal ring energy of 2.5 GeV. The monochromator is based on the Dragon concept with spherical grating, movable exit slit but with water-cooled optical elements in order to deal with the maximum flux of ca. 400 W. This system represents one of the next generation of soft x-ray undulator beam lines which will figure prominently at new synchrotron radiation facilities such as ALS, ELETTRA and BESSY II. During the first performance tests absorption spectra of simple molecules at the C, N, and O K edges have been recorded with resolution and flux so far unattained in the soft x-ray region. C1 EXXON RES & ENGN CO, ANNANDALE, NJ 08801 USA. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP RANDALL, KJ (reprint author), MAX PLANCK GESELL, FRITZ HABER INST, FARADAYWEG 46, W-1000 BERLIN 33, GERMANY. RI Feldhaus, Josef/C-1130-2014 NR 16 TC 93 Z9 96 U1 0 U2 5 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 JAN PY 1992 VL 63 IS 1 BP 1367 EP 1370 DI 10.1063/1.1143072 PN 2B PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300122 ER PT J AU MCWHAN, DB HASTINGS, JB KAO, CC SIDDONS, DP AF MCWHAN, DB HASTINGS, JB KAO, CC SIDDONS, DP TI RESONANT AND NONRESONANT MAGNETIC SCATTERING SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND ID X-RAY-SCATTERING; EXCHANGE SCATTERING; ABSORPTION; POLARIZATION; DIFFRACTION; HOLMIUM; IRON AB The tunability and the polarization of synchrotron radiation open up new possibilities for the study of magnetism. Studies on magnetic materials performed at the National Synchrotron Light Source are reviewed, and they fall into four areas: structure, evolution of magnetic order, separation of L and S, and resonance effects. In the vicinity of atomic absorption edges, the Faraday effect, magnetic circular dichroism, and resonant magnetic scattering are all related resonance effects which measure the spin-polarized density of states. The production and analysis of polarized beams are discussed in the context of the study of magnetism with synchrotron radiation. RP MCWHAN, DB (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 35 TC 10 Z9 10 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 1404 EP 1408 DI 10.1063/1.1143028 PN 2B PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300130 ER PT J AU MCKINNEY, WR AF MCKINNEY, WR TI VARIED LINE-SPACE GRATINGS AND APPLICATIONS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND ID MONOCHROMATORS; SPECTROMETER AB This paper presents a straightforward analytical and numerical method for the design of a specific type of varied line-space grating system. The mathematical development will assume plane or nearly plane spherical gratings that are illuminated by convergent light, which covers many interesting cases for synchrotron radiation. The gratings discussed will have straight grooves whose spacing varies across the principal plane of the grating. Focal relationships and formulas for the optimal grating-pole-to-exit-slit distance and grating radius previously presented by other authors will be derived with a symbolic algebra system. It is intended to provide the optical designer with the tools necessary to design such a system properly. Finally, some possible advantages and disadvantages for application to synchroton radiation beamlines will be discussed. RP MCKINNEY, WR (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ACCELERATOR & FUS RES,BERKELEY,CA 94720, USA. RI McKinney, Wayne/F-2027-2014 OI McKinney, Wayne/0000-0003-2586-3139 NR 18 TC 16 Z9 17 U1 1 U2 4 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 JAN PY 1992 VL 63 IS 1 BP 1410 EP 1414 DI 10.1063/1.1143030 PN 2B PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300131 ER PT J AU IRICK, SC AF IRICK, SC TI DETERMINING SURFACE PROFILE FROM SEQUENTIAL INTERFERENCE PATTERNS FROM A LONG TRACER PROFILER SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND AB The long trace profiler [P. Z. Takacs and S. Qian, U.S. Patent No. 4884697 (5 December, 1989)] is a slope-measuring instrument that was introduced several years ago. Development of this instrument continues at Lawrence Berkeley Laboratory in improving both hardware design and software algorithms for turning the raw interference data (a sequence of intensity patterns) into properly interpreted representations of surface slope and height. This report presents a mathematical model of the interference pattern and methods of extracting the slope and height profile from such patterns. RP IRICK, SC (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ACCELERATOR & FUS RES,BERKELEY,CA 94720, USA. NR 9 TC 21 Z9 24 U1 1 U2 5 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 JAN PY 1992 VL 63 IS 1 BP 1432 EP 1435 DI 10.1063/1.1143035 PN 2B PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300136 ER PT J AU IRICK, SC MCKINNEY, WR LUNT, DLJ TAKACS, PZ AF IRICK, SC MCKINNEY, WR LUNT, DLJ TAKACS, PZ TI USING A STRAIGHTNESS REFERENCE IN OBTAINING MORE ACCURATE SURFACE PROFILES FROM A LONG TRACE PROFILER SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND AB The long trace profiler (Takacs et al.) has found significant applications in measuring the surfaces of synchrotron optics. However, requirements of small slope errors at all spatial wavelengths of the synchrotron optics mandate more accurate slope measurements. A straightness reference for the long trace profiler greatly increases the accuracy of the instrument. Methods of using the straightness reference by interpreting the sequential interference patterns are discussed and results of measurements are presented. C1 TUCSON OPT RES CORP,TUCSON,AZ 85719. BROOKHAVEN NATL LAB,DIV INSTRUMENTAT,UPTON,NY 11973. RP IRICK, SC (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ACCELERATOR & FUS RES,BERKELEY,CA 94720, USA. RI McKinney, Wayne/F-2027-2014 OI McKinney, Wayne/0000-0003-2586-3139 NR 6 TC 45 Z9 46 U1 3 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 1436 EP 1438 DI 10.1063/1.1143036 PN 2B PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300137 ER PT J AU JOHNSON, ED KAO, CC HASTINGS, JB AF JOHNSON, ED KAO, CC HASTINGS, JB TI RECENT ADVANCES IN SOFT-X-RAY SCATTERING INSTRUMENTATION AT THE NATIONAL SYNCHROTRON LIGHT-SOURCE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND ID REFLECTOMETER AB For the study of condensed-matter systems x-ray scattering experiments are often the best choice as they have several desirable features including complete conservation of momentum in the incident and detected particles, well characterized initial and final electronic states, and insensitivity of photon transport to external electric and magnetic fields (as compared to photoelectrons, for example). To extend these techniques to soft x-ray region (HBAR nu < 1 keV) the lack of suitable detectors, and the difficulties associated with performing scattering experiments in vacuum must be overcome. In this article we provide details of our instrumental development program, and show some representative examples of experiments we have performed to date. RP JOHNSON, ED (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 7 TC 13 Z9 13 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 1443 EP 1446 DI 10.1063/1.1143038 PN 2B PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300139 ER PT J AU GLUSKIN, ES AF GLUSKIN, ES TI A UNIVERSAL POLARIMETER FOR THE SOFT-X-RAY AND VACUUM ULTRAVIOLET WAVELENGTH REGION SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND ID RADIATION AB A universal polarimeter was designed and built to analyze polarization properties of soft x-ray and vacuum ultraviolet radiation from different types of sources. The design, based on the use of multilayer-polarizers, includes an option to monitor the polarization with a 1 kHz frequency. The polarimeter was tested on the U5 undulator beamline at NSLS. RP GLUSKIN, ES (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 9 TC 9 Z9 9 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 1523 EP 1524 DI 10.1063/1.1143011 PN 2B PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300161 ER PT J AU WILLIAMS, GP AF WILLIAMS, GP TI INFRARED SYNCHROTRON RADIATION INSTRUMENTATION AND APPLICATIONS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND AB Infrared synchrotron radiation (IRSR) in the wavelength range from 1-mu-m to approximately 1 cm has now been used quite extensively both in Japan at UVSOR, Okasaki and in the United States at the NSLS, Brookhaven, following an earlier program at the first infrared beamline at Daresbury in England. Elsewhere around the world, several new beamlines are under construction or planned-including a new facility at Daresbury (UK), and those at Lund (Sweden), SuperACO (France), ADONE (Italy), and the ALS (USA). The use of IRSR poses many new challenges, none the least of which is the fact that the radiation covers four decades of energy and is also very divergent and subject to diffraction. However the advantages are particularly significant due to the 1000-fold increase in brightness available over conventional sources in a region where detectors become a limiting factor. In addition, IRSR is also highly spatially coherent allowing the possibility of a new class of interferometers based on wave front division. We will discuss this and other instrumentation issues as they critically relate to experiments. The applications discussed will be in the areas of surface vibrational spectroscopy, both in ultrahigh vacuum and in electrochemical cells, and in areas which use the pulsed nature of the source both for fast response studies and for pump-probe studies. RP WILLIAMS, GP (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 10 TC 34 Z9 34 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 1535 EP 1538 DI 10.1063/1.1143014 PN 2B PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300164 ER PT J AU ROBINSON, AL PERERA, RCC SCHLACHTER, AS AF ROBINSON, AL PERERA, RCC SCHLACHTER, AS TI THE ADVANCED LIGHT-SOURCE AT LAWRENCE-BERKELEY-LABORATORY SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND AB The Advanced Light Source (ALS) at the Lawrence Berkeley Laboratory (LBL), scheduled to be operational in the spring of 1993 as a U.S. Department of Energy national user facility, will be a next-generation source of soft x-ray and ultraviolet (XUV) synchrotron radiation. Undulators will provide the world's brightest synchrotron radiation at photon energies from below 10 eV to above 2 keV; wiggler and bend-magnet radiation will extend the spectral coverage with high fluxes above 10 keV. These capabilities will support an extensive research program in a broad spectrum of scientific and technological areas in which XUV radiation is used to study and manipulate matter in all its varied gaseous, liquid, and solid forms. The ALS will also serve those interested in developing the fabrication technology for microstructures and nanostructures, as well as for characterizing them. RP ROBINSON, AL (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 1555 EP 1556 DI 10.1063/1.1143018 PN 2B PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300169 ER PT J AU MONCTON, DE AF MONCTON, DE TI THE ADVANCED PHOTON SOURCE AT ARGONNE-NATIONAL-LABORATORY SUMMER 1991 SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND AB The Advanced Photon Source at Argonne National Laboratory is designed as a national synchrotron radiation user facility where extremely bright 1-100 keV x-ray beams will be used for multidisciplinary research. Construction of the facility has begun. Accelerator components, insertion devices, optical elements, and optical element cooling schemes have been and continue to be the subjects of intensive research and development. Proposals to conduct research at the Advanced Photon Source have been received from industrial, university, and national laboratory scientists representing a broad range of scientific disciplines. RP MONCTON, DE (reprint author), ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439, USA. NR 0 TC 1 Z9 1 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 1557 EP 1558 DI 10.1063/1.1143831 PN 2B PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300170 ER PT J AU GMUR, N HULBERT, S LAZARZ, N MCWHAN, DB AF GMUR, N HULBERT, S LAZARZ, N MCWHAN, DB TI THE NSLS - REPRESENTATIVE SCIENCE FROM 0.2 MEV TO 320 MEV SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND ID SURFACE; TRANSITION; BEHAVIOR RP GMUR, N (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 28 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 1563 EP 1564 DI 10.1063/1.1143021 PN 2B PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300173 ER PT J AU CANTWELL, K PIANETTA, P AF CANTWELL, K PIANETTA, P TI THE STANFORD SYNCHROTRON RADIATION LABORATORY - AN UPDATE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND AB The present status and future directions of scientific and machine development at the Standford Synchrotron Radiation Laboratory (SSRL) are reviewed. A central focus is on the transformation of SPEAR into a fully dedicated synchrotron radiation source served by an independent 3-GeV booster injector synchrotron. RP CANTWELL, K (reprint author), SSRL,MS 69,POB 4349,STANFORD,CA 94309, USA. NR 7 TC 1 Z9 1 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 1609 EP 1610 DI 10.1063/1.1142991 PN 2B PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300194 ER PT J AU FREUND, AK MILLS, DM AF FREUND, AK MILLS, DM TI SUMMARY OF THE SATELLITE WORKSHOP ON THERMAL PROBLEMS OF SYNCHROTRON RADIATION OPTICS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL CONF ON SYNCHROTRON RADIATION INSTRUMENTATION CY JUL 15-19, 1991 CL CHESTER, ENGLAND AB Highlights of a workshop on thermal problems of synchrotron radiation optics, a satellite meeting of the 4th International Conference on Synchrotron Radiation Instrumentation, will be presented. The most recent theoretical concepts and experimental results in studies of the thermal distortion of components exposed to the high heat loads of synchrotron radiation were discussed. Presentations were made on a variety of cooling techniques such as adaptive optical components, cryogenic cooling, nonstandard geometries (e.g., thin crystals and inclined crystals), and specialized materials (e.g., beryllium single crystals and multilayers), all of which attempt to mitigate the thermal effects on the performance of the x-ray optical components. C1 ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439. RP FREUND, AK (reprint author), EUROPEAN SYNCHROTRON RADIAT FACIL,BP 220,F-38043 GRENOBLE,FRANCE. NR 0 TC 3 Z9 3 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JAN PY 1992 VL 63 IS 1 BP 1623 EP 1624 DI 10.1063/1.1142997 PN 2B PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GZ943 UT WOS:A1992GZ94300200 ER PT J AU ELSTON, RA MOORE, JD BROOKS, K AF ELSTON, RA MOORE, JD BROOKS, K TI DISSEMINATED NEOPLASIA OF BIVALVE MOLLUSKS SO REVIEWS IN AQUATIC SCIENCES LA English DT Review DE CANCER; NEOPLASIA; LEUKEMIA; MARINE DISEASES; BIVALVE; MOLLUSK; INVERTEBRATE AB Disseminated neoplasia of bivalve molluscs. discovered in 1969, occurs in at least 15 marine species. This review considers in detail all of the published literature and critically reviews subjects including cytology and pathologic manifestations, pathogenesis, tissues of origin, etiology, epizootiology, and diagnosis and staging. The fatal conditions have the potential to be extremely useful for providing understanding of perturbations to the marine environment and of elements of cancer progression. Typically, anaplastic cells with enlarged nuclei, scant cytoplasm, and frequent mitotic figures are found in circulation. The conditions frequently progress to a fatal outcome, but some individuals can effect remission. The impact of the diseases on natural populations is substantial. Precise definition of the etiology has not been determined, but individual genetic makeup and environmental factors clearly are important. Research in the last 10 years has advanced knowledge of these conditions beyond descriptive data. They now offer potential for important environmental and biomedical studies. RP ELSTON, RA (reprint author), BATTELLE MARINE SCI LAB,439 W SEQUIM BAY RD,SEQUIM,WA 98382, USA. NR 0 TC 87 Z9 87 U1 2 U2 9 PU CRC PRESS INC PI BOCA RATON PA 2000 CORPORATE BLVD NW, JOURNALS CUSTOMER SERVICE, BOCA RATON, FL 33431 SN 0891-4117 J9 REV AQUAT SCI PY 1992 VL 6 IS 5-6 BP 405 EP 466 PG 62 WC Fisheries; Marine & Freshwater Biology; Oceanography SC Fisheries; Marine & Freshwater Biology; Oceanography GA JV529 UT WOS:A1992JV52900002 ER PT J AU MARTINEZ, L OLIVER, WC WILLIAMS, RK AF MARTINEZ, L OLIVER, WC WILLIAMS, RK TI CHARACTERIZATION OF YBA2CU3O7-X IN A MECHANICAL-PROPERTIES MICROPROBE SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID HARDNESS; GRAIN C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP MARTINEZ, L (reprint author), UNIV NACL AUTONOMA MEXICO,INST FIS,AP 139-B,CUERNAVACA 62191,MORELOS,MEXICO. NR 14 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JAN 1 PY 1992 VL 26 IS 1 BP 7 EP 12 DI 10.1016/0956-716X(92)90359-M PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA GW665 UT WOS:A1992GW66500002 ER PT J AU WILSON, DF CAVIN, OB AF WILSON, DF CAVIN, OB TI THERMAL-EXPANSION BEHAVIOR OF NISI/NISI2 SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article RP WILSON, DF (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 3 TC 31 Z9 32 U1 1 U2 4 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 JAN 1 PY 1992 VL 26 IS 1 BP 85 EP 88 DI 10.1016/0956-716X(92)90374-N PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA GW665 UT WOS:A1992GW66500017 ER PT J AU DAVENPORT, DM AF DAVENPORT, DM TI ON POWER COMMUTATIVE SEMIGROUPS SO SEMIGROUP FORUM LA English DT Article C1 SANDIA NATL LABS,ORG 1423,ALBUQUERQUE,NM 87185. NR 14 TC 4 Z9 4 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0037-1912 J9 SEMIGROUP FORUM JI Semigr. Forum PY 1992 VL 44 IS 1 BP 9 EP 20 DI 10.1007/BF02574321 PG 12 WC Mathematics SC Mathematics GA GZ582 UT WOS:A1992GZ58200002 ER PT J AU TAKIGAWA, DY AF TAKIGAWA, DY TI THE EFFECT OF POROUS SUPPORT COMPOSITION AND OPERATING PARAMETERS ON THE PERFORMANCE OF SUPPORTED LIQUID MEMBRANES SO SEPARATION SCIENCE AND TECHNOLOGY LA English DT Article ID SEPARATIONS; TRANSPORT AB Factors, such as porous support composition and operating parameters, that influence the performance of supported liquid membranes (SLMs) were investigated. SLMs of varying porous support compositions and structures were studied for the transport of metal ions. A microporous polybenzimidazole support was synthesized and prepared in the form of an SLM. This SLM, containing the selective extractant di-(2-ethylhexyl)phosphoric acid, was evaluated for the transport of copper and neodymium. Dramatically improved performance over that of commercially available membranes was found in tests for removing the metal ions from solution. Metal ion transport reaches near completion in less than 3 h, whereas Celgard-polypropyiene and Nuclepore-polycarbonate reaches only 50% completion even after 15 h. The transport driving force for acidic extractants is a pH gradient between the feed and strip solutions. Polybenzimidazole, an acid- and radiation-resistant polymer, has two protonatable tertiary nitrogens per repeat unit that may help sustain the pH driving force. Another factor may be the ability of the polybenzimidazole to hydrogen bond with the extractant. Transport through the flat-sheet SLMs was tested by using a unique cell design. Countercurrent flow of the feed and strip solutions was established through machined channels in half-cell faceplates that are in a spiral, mirror-image pattern with respect to each other, with the flat-sheet SLM interposed between the two channeled solutions. Advantages comprised in the design of the two clamped half-cells (tangential entry, zero primary pressure, zero pressure differential, controlled flow regimes, no sharp turns, and channeled flow) give operating parameters that will not physically dislodge the liquid membrane from the porous support; consequently, the lifetime of the support is increased. Permeability coefficients remained unchanged after a month of daily use versus 20 to 100% declines for membranes in other cell configurations. RP TAKIGAWA, DY (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,NMT-2,MS E501,LOS ALAMOS,NM 87545, USA. NR 7 TC 21 Z9 21 U1 1 U2 4 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0149-6395 J9 SEPAR SCI TECHNOL JI Sep. Sci. Technol. PY 1992 VL 27 IS 3 BP 325 EP 339 DI 10.1080/01496399208018883 PG 15 WC Chemistry, Multidisciplinary; Engineering, Chemical SC Chemistry; Engineering GA HJ363 UT WOS:A1992HJ36300004 ER PT J AU CHAIKO, DJ AF CHAIKO, DJ TI PARTITIONING OF POLYMERIC PLUTONIUM(IV) IN WINSOR-II MICROEMULSION SYSTEMS SO SEPARATION SCIENCE AND TECHNOLOGY LA English DT Article ID SOLVENT-EXTRACTION; SMALL MOLECULES; MICELLES; SELECTIVITY; SCATTERING; MEDIA; WATER AB The hydrolysis and polymerization of Pu(IV) can cause serious problems during the aqueous processing of spent fuel and nuclear wastes. Several studies describing the liquid/liquid extraction behavior of polymeric Pu(IV) have been reported in the literature. In many cases, poor plutonium extraction was accompanied by the appearance of an interfacial crud or third phase. Invariably, poor mass balances were observed during the extraction of aged, colloidal Pu(IV). Extraction of colloidal Pu(IV) by microemulsion-based solvent extraction systems, however, is capable of attaining bulk phase mass balances for Pu of 100%. The Winsor II microemulsions discussed in this paper consisted of sodium bis(2-ethylhexyl) sulfosuccinate in hexane with either octylphenyl-N,N-diisobutylcarbamoylmethyl-phosphine oxide or tributyl phosphate as coextractant. Backextraction of plutonium from microemulsion phases was achieved by Pu encapsulation in silica particles that were produced by the acid-catalyzed hydrolysis and polymerization of tetra-ethoxysilane within the aqueous microdroplets of the microemulsion. RP CHAIKO, DJ (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439, USA. NR 43 TC 2 Z9 2 U1 1 U2 2 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0149-6395 J9 SEPAR SCI TECHNOL JI Sep. Sci. Technol. PY 1992 VL 27 IS 11 BP 1389 EP 1405 DI 10.1080/01496399208019432 PG 17 WC Chemistry, Multidisciplinary; Engineering, Chemical SC Chemistry; Engineering GA JH917 UT WOS:A1992JH91700003 ER PT J AU DEPAOLI, DW SCOTT, TC BASARAN, OA AF DEPAOLI, DW SCOTT, TC BASARAN, OA TI OSCILLATION FREQUENCIES OF DROPLETS HELD PENDANT ON A NOZZLE SO SEPARATION SCIENCE AND TECHNOLOGY LA English DT Article ID LIQUID-SYSTEMS; BUBBLES; DRIVEN; PHASE; DROPS AB Small-amplitude oscillations of liquid droplets held pendant on a nozzle and surrounded by either air or another liquid were investigated experimentally. The oscillations were induced by mechanical means, and the natural frequencies of oscillations were visually determined. Results are compared to existing related theories of Miller and Scriven and of Strani and Sabetta. As may be expected, the presence of the solid support causes measured oscillation frequencies for the lowest oscillation mode to deviate greatly from the Miller and Scriven low viscosity approximation (n = 2) for free spherical drops. Experiments are in qualitative agreement with the first (n = 1) mode predicted by Strani and Sabetta, with the best correspondence occurring under circumstances where the ratio of nozzle to drop radii is small. The difference between the experimental results and the theory of Strani and Sabetta can be attributed to the restrictive boundary conditions of their analytic model. Thus, better theoretical characterization of pendant droplet oscillations will require numerical computations. RP DEPAOLI, DW (reprint author), OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831, USA. NR 14 TC 19 Z9 19 U1 0 U2 9 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0149-6395 J9 SEPAR SCI TECHNOL JI Sep. Sci. Technol. PY 1992 VL 27 IS 15 BP 2071 EP 2082 DI 10.1080/01496399208019466 PG 12 WC Chemistry, Multidisciplinary; Engineering, Chemical SC Chemistry; Engineering GA JX580 UT WOS:A1992JX58000003 ER PT J AU DONGARRA, JJ HAMMARLING, S WILKINSON, JH AF DONGARRA, JJ HAMMARLING, S WILKINSON, JH TI NUMERICAL CONSIDERATIONS IN COMPUTING INVARIANT SUBSPACES SO SIAM JOURNAL ON MATRIX ANALYSIS AND APPLICATIONS LA English DT Article DE INVARIANT SUBSPACES; EIGENVALUES; ILL-CONDITIONED EIGENVALUES ID JORDAN NORMAL-FORM; COMPLEX MATRIX; COMPUTATION; SENSITIVITY; EIGENVALUES; ALGORITHM AB This paper describes two methods for computing the invariant subspace of a matrix. The first method involves using transformations to interchange the eigenvalues. The matrix is assumed to be in Schur form and transformations are applied to interchange neighboring blocks. The blocks can be either one by one or two by two. The second method involves the construction of an invariant subspace by a direct computation of the vectors, rather than by applying transformations to move the desired eigenvalues to the top of the matrix. C1 OAK RIDGE NATL LAB,MATH SCI SECT,OAK RIDGE,TN 37831. NUMER ALGORITHMS GRP LTD,OXFORD OX2 8DR,ENGLAND. RP DONGARRA, JJ (reprint author), UNIV TENNESSEE,DEPT COMP SCI,KNOXVILLE,TN 37996, USA. RI Dongarra, Jack/E-3987-2014 NR 13 TC 15 Z9 15 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0895-4798 J9 SIAM J MATRIX ANAL A JI SIAM J. Matrix Anal. Appl. PD JAN PY 1992 VL 13 IS 1 BP 145 EP 161 DI 10.1137/0613013 PG 17 WC Mathematics, Applied SC Mathematics GA HC846 UT WOS:A1992HC84600013 ER PT J AU ASHBY, SF MANTEUFFEL, TA OTTO, JS AF ASHBY, SF MANTEUFFEL, TA OTTO, JS TI A COMPARISON OF ADAPTIVE CHEBYSHEV AND LEAST-SQUARES POLYNOMIAL PRECONDITIONING FOR HERMITIAN POSITIVE DEFINITE LINEAR-SYSTEMS SO SIAM JOURNAL ON SCIENTIFIC AND STATISTICAL COMPUTING LA English DT Article DE CONJUGATE GRADIENT METHODS; POLYNOMIAL PRECONDITIONING; CHEBYSHEV POLYNOMIAL; LEAST SQUARES POLYNOMIAL; ADAPTIVE PROCEDURE ID CONJUGATE-GRADIENT METHOD; ITERATIVE METHODS; MATRIX AB This paper explores the use of adaptive polynomial preconditioning for Hermitian positive definite linear systems, Ax = b. Such preconditioners are easy to employ and well suited to vector and/or parallel machines. After examining the role of polynomial preconditioning in conjugate gradient methods, the least squares and Chebyshev preconditioning polynomials are discussed. Eigenvalue distributions for which each is well suited are then determined. An adaptive procedure for dynamically computing the best Chebyshev polynomial preconditioner is also described. Finally, the effectiveness of adaptive polynomial preconditioning is demonstrated in a variety of numerical experiments on a Cray X-MP/48 and Alliant FX/8. The results suggest that relatively low degree (2-16) polynomials are usually best. C1 UNIV COLORADO,COMPUTAT MATH GRP,DENVER,CO 80217. RP ASHBY, SF (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV COMP & MATH RES,POB 808,LIVERMORE,CA 94551, USA. NR 33 TC 16 Z9 16 U1 0 U2 1 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0196-5204 J9 SIAM J SCI STAT COMP PD JAN PY 1992 VL 13 IS 1 BP 1 EP 29 DI 10.1137/0913001 PG 29 WC Mathematics, Applied SC Mathematics GA HB904 UT WOS:A1992HB90400002 ER PT J AU TUMINARO, RS AF TUMINARO, RS TI A HIGHLY PARALLEL MULTIGRID-LIKE METHOD FOR THE SOLUTION OF THE EULER EQUATIONS SO SIAM JOURNAL ON SCIENTIFIC AND STATISTICAL COMPUTING LA English DT Article DE MULTIGRID; PARALLEL; EULER EQUATIONS; FILTERING AB A highly parallel multigrid-like method for the solution of the two-dimensional steady Euler equations is considered. The new method, introduced in [T. Chan and R. Tuminaro, in Proc. Third Copper Mountain Conference on Multigrid Methods, 1987, pp. 101-115] as a "filtering" multigrid, is similar to a standard multigrid scheme in that convergence on the finest grid is accelerated by iterations on coarser grids. In the filtering method, however, additional fine grid subproblems are processed concurrently with coarse grid computations to further accelerate convergence. These additional problems are obtained by splitting the residual into a smooth and an oscillatory component. The smooth component is then used to form a coarse grid problem (similar to standard multigrid) while the oscillatory component is used for a fine grid subproblem. The primary advantage in the filtering approach is that fewer iterations are required and that most of the additional work per iteration can be performed in parallel with the standard coarse grid computations. In this paper, the filtering algorithm is generalized to a version suitable for nonlinear problems. It is emphasized that this generalization is conceptually straightforward and relatively easy to implement. In particular, no explicit linearization (e.g., formation of Jacobians) needs to be performed (similar to the FAS multigrid approach). The nonlinear version is illustrated by applying it to the Euler equations and presenting numerical results. Finally, a performance evaluation is made based on execution time models and convergence information obtained from numerical experiments. RP TUMINARO, RS (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 11 TC 8 Z9 8 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0196-5204 J9 SIAM J SCI STAT COMP PD JAN PY 1992 VL 13 IS 1 BP 88 EP 100 DI 10.1137/0913005 PG 13 WC Mathematics, Applied SC Mathematics GA HB904 UT WOS:A1992HB90400006 ER PT J AU GROPP, WD KEYES, DE AF GROPP, WD KEYES, DE TI PARALLEL PERFORMANCE OF DOMAIN-DECOMPOSED PRECONDITIONED KRYLOV METHODS FOR PDES WITH LOCALLY UNIFORM REFINEMENT SO SIAM JOURNAL ON SCIENTIFIC AND STATISTICAL COMPUTING LA English DT Article DE DOMAIN DECOMPOSITION; ELLIPTIC PROBLEMS; PARALLEL ALGORITHMS; MESH REFINEMENT ID NONSYMMETRIC LINEAR-SYSTEMS AB Preconditioners based on domain decomposition appear natural for the Krylov solution of implicitly discretized partial differential equations (PDEs) on parallel computers. Two-scale preconditioners (involving a global coarse-grid solve, independent solves over interfaces connecting the coarse-grid points, and independent subdomain solves) have been known since the early 1980s to be "near optimal" in the sense of ensuring a bounded, or at most logarithmically growing, iteration count as the mesh is refined. As a result, the refinement of the mesh can be chosen locally on the basis of truncation error, and the granularity of the domain decomposition can be chosen globally on the basis of parallel computing considerations with only mild effects on the convergence rate of the algorithm. However, overall computational complexity depends not only on the algebraic convergence rate, but also on the operation counts of the components of the preconditioner that must be applied at each iteration. The costs of solving the subdomain systems and the crosspoint system show superlinear growth in their respective (and inversely related) sizes. On the subdomains, the superlinear terms arise from arithmetic only; in the crosspoint system the cost of nonlocal data exchange is also superlinear. These factors make the preconditioner granularity and the choice of its components problem- and machine-dependent compromises. The tradeoffs involved are illustrated through numerical experiments on both shared- and distributed-memory computers for convection-diffusion problems. Because of the development of boundary layers, these problems benefit from local mesh refinement, which is straightforward to accommodate within the domain decomposition framework in a locally uniform sense, but which introduces load balancing as a further consideration in selecting the granularity of the preconditioner. In spite of the tradeoffs, cumulative speedups are obtainable out to at least medium-scale granularity (up to 64 processors in our tests). The largest problems involve O(10(5)) unknowns partitioned into O(10(3)) subdomains and converge in O(10) iterations requiring O(1) seconds on the Intel iPSC/860. C1 YALE UNIV,DEPT MECH ENGN,NEW HAVEN,CT 06520. RP GROPP, WD (reprint author), ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439, USA. NR 25 TC 7 Z9 7 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0196-5204 J9 SIAM J SCI STAT COMP PD JAN PY 1992 VL 13 IS 1 BP 128 EP 145 DI 10.1137/0913008 PG 18 WC Mathematics, Applied SC Mathematics GA HB904 UT WOS:A1992HB90400009 ER PT J AU TONG, CH CHAN, TF KUO, CCJ AF TONG, CH CHAN, TF KUO, CCJ TI MULTILEVEL FILTERING PRECONDITIONERS - EXTENSIONS TO MORE GENERAL ELLIPTIC PROBLEMS SO SIAM JOURNAL ON SCIENTIFIC AND STATISTICAL COMPUTING LA English DT Article DE MULTILEVEL PRECONDITIONERS; ELLIPTIC PROBLEMS; CONJUGATE GRADIENT METHOD; DOMAIN DECOMPOSITION ID HIERARCHICAL BASIS; EQUATIONS AB The concept of multilevel filtering (MF) preconditioning applied to second-order selfadjoint elliptic problems is briefly reviewed. It is then shown how to effectively apply this concept to other elliptic problems such as the second-order anisotropic problem, biharmonic equation, equations on locally refined grids and interface operators arising from domain decomposition methods. Numerical results are given to show the effectiveness of the MF preconditioners on these problems. C1 UNIV CALIF LOS ANGELES,DEPT MATH,LOS ANGELES,CA 90024. UNIV SO CALIF,DEPT ELECT ENGN SYST,LOS ANGELES,CA 90089. RP TONG, CH (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. RI Kuo, C.-C. Jay/A-7110-2011; Chan, Tony/A-4166-2013 OI Kuo, C.-C. Jay/0000-0001-9474-5035; NR 28 TC 10 Z9 10 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0196-5204 J9 SIAM J SCI STAT COMP PD JAN PY 1992 VL 13 IS 1 BP 227 EP 242 DI 10.1137/0913012 PG 16 WC Mathematics, Applied SC Mathematics GA HB904 UT WOS:A1992HB90400013 ER PT J AU JOUBERT, W MANTEUFFEL, TA PARTER, S WONG, SP AF JOUBERT, W MANTEUFFEL, TA PARTER, S WONG, SP TI PRECONDITIONING 2ND-ORDER ELLIPTIC-OPERATORS - EXPERIMENT AND THEORY SO SIAM JOURNAL ON SCIENTIFIC AND STATISTICAL COMPUTING LA English DT Article DE PRECONDITIONING; BOUNDARY CONDITIONS; CONJUGATE GRADIENT; EXPERIMENT AB In an earlier work Manteuffel and Parter discussed the role of boundary conditions in obtaining elliptic operators B so that the preconditioned operators B(h)-1 A(h) or A(h)B(h)-1 have uniformly bounded L2 condition number. Here A is the original elliptic operator and A(h) and B(h) are discretizations. Certain computations, mostly one-dimensional, were undertaken to illustrate and understand these results. These computational experiments provided several surprises. This current work describes those experiments and some subsequent experiments together with theoretical explanations of these surprising results. One of the main points of this report is the discussion of interaction of experimental results with the ensuing development of the theory. C1 UNIV COLORADO,COMPUTAT MATH GRP,DENVER,CO 80204. UNIV CALIF LOS ALAMOS SCI LAB,DIV COMP & COMMUN,LOS ALAMOS,NM 87544. UNIV WISCONSIN,DEPT COMP SCI,MADISON,WI 53706. UNIV WISCONSIN,DEPT MATH,MADISON,WI 53706. RP JOUBERT, W (reprint author), UNIV TEXAS,CTR NUMER ANAL,AUSTIN,TX 78712, USA. NR 7 TC 8 Z9 8 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0196-5204 J9 SIAM J SCI STAT COMP PD JAN PY 1992 VL 13 IS 1 BP 259 EP 288 DI 10.1137/0913014 PG 30 WC Mathematics, Applied SC Mathematics GA HB904 UT WOS:A1992HB90400015 ER PT J AU SMITH, BF AF SMITH, BF TI AN OPTIMAL DOMAIN DECOMPOSITION PRECONDITIONER FOR THE FINITE-ELEMENT SOLUTION OF LINEAR ELASTICITY PROBLEMS SO SIAM JOURNAL ON SCIENTIFIC AND STATISTICAL COMPUTING LA English DT Article DE ADDITIVE SCHWARZ METHODS; DOMAIN DECOMPOSITION; ELLIPTIC EQUATIONS; FINITE ELEMENTS; ITERATIVE SUBSTRUCTURING; LINEAR ELASTICITY; PRECONDITIONED CONJUGATE GRADIENT; SCHUR COMPLEMENT ID ELLIPTIC PROBLEMS; CONSTRUCTION AB For linear elasticity problems the finite element method is an extremely successful method to model complicated structures. The successful implementation requires the solution of very large, sparse, positive definite linear systems of algebraic equations. A new technique for solving these systems using the preconditioned conjugate gradient method is proposed. Using, ideas from both additive Schwarz methods and iterative substructuring methods, it is proven that the condition number of the resulting system does not grow as the substructures are made smaller and the mesh is refined. This result holds for two and three dimensions. Numerical experiments have been performed to demonstrate the power of this method. For linear elasticity problems in two dimensions the condition numbers are observed numerically to be less than four when using a regular mesh. RP SMITH, BF (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 35 TC 41 Z9 42 U1 0 U2 1 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0196-5204 J9 SIAM J SCI STAT COMP PD JAN PY 1992 VL 13 IS 1 BP 364 EP 378 DI 10.1137/0913019 PG 15 WC Mathematics, Applied SC Mathematics GA HB904 UT WOS:A1992HB90400020 ER PT J AU BRAMBLE, JH EWING, RE PARASHKEVOV, RR PASCIAK, JE AF BRAMBLE, JH EWING, RE PARASHKEVOV, RR PASCIAK, JE TI DOMAIN DECOMPOSITION METHODS FOR PROBLEMS WITH PARTIAL REFINEMENT SO SIAM JOURNAL ON SCIENTIFIC AND STATISTICAL COMPUTING LA English DT Article DE 2ND-ORDER ELLIPTIC EQUATION; DOMAIN DECOMPOSITION; OVERLAPPING DOMAIN DECOMPOSITION; LOCAL MESH REFINEMENT; PARTIAL REFINEMENT; OVERLAPPING SCHWARZ METHODS; PRECONDITIONERS ID ELLIPTIC PROBLEMS; PRECONDITIONERS; CONSTRUCTION AB In this paper, a flexible mesh refinement strategy for the approximation of solutions of elliptic boundary value problems is considered. The main purpose of the paper is the development of preconditioners for the resulting discrete system of algebraic equations. These techniques lead to efficient computational procedures in serial as well as parallel computing environments. The preconditioners are based on overlapping domain decomposition and involve solving (or preconditioning) subproblems on regular subregions. It is proven that the iteration schemes converge to the discrete solution at a rate which is independent of the mesh parameters in the case of two spatial dimensions. The estimates proved for the iterative convergence rate in three dimensions are somewhat weaker. The results of numerical experiments illustrating the theory are also presented. C1 UNIV WYOMING,DEPT MATH,LARAMIE,WY 82071. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP BRAMBLE, JH (reprint author), CORNELL UNIV,DEPT MATH,ITHACA,NY 14853, USA. NR 14 TC 16 Z9 16 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0196-5204 J9 SIAM J SCI STAT COMP PD JAN PY 1992 VL 13 IS 1 BP 397 EP 410 DI 10.1137/0913021 PG 14 WC Mathematics, Applied SC Mathematics GA HB904 UT WOS:A1992HB90400022 ER PT J AU STREB, AJ AF STREB, AJ TI STRATEGIES FOR REDUCING UNITED-STATES INDUSTRIAL ENERGY-CONSUMPTION SO SIEMENS REVIEW LA English DT Article RP STREB, AJ (reprint author), US DOE,IND TECHNOL,WASHINGTON,DC, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SIEMENS-AKTIENGESELLSCHAFT PI ERLANGEN 2 PA POSTFACH 3240, W-8520 ERLANGEN 2, GERMANY SN 0302-2528 J9 SIEMENS REV JI Siemens Rev. PD JAN-FEB PY 1992 VL 59 IS 1 BP 16 EP 21 PG 6 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA HL638 UT WOS:A1992HL63800004 ER PT J AU OTTENSTEIN, KJ ELLCEY, SJ AF OTTENSTEIN, KJ ELLCEY, SJ TI EXPERIENCE COMPILING FORTRAN TO PROGRAM DEPENDENCE GRAPHS SO SOFTWARE-PRACTICE & EXPERIENCE LA English DT Article DE COMPILER; OPTIMIZATION; DATA-FLOW ANALYSIS; CONTROL DEPENDENCE; INTERNAL PROGRAM REPRESENTATION AB The program dependence graph (PDG) is being used in research projects for compilation to parallel architectures, program version integration and program semantics. This paper describes the methods used in a prototype Fortran-to-PDG translator called the PDG Testbed. Implementation decisions and details of the PDG Testbed project are described as a complement to the formal papers detailing the PDG. In addition, experimental results are given that show the storage consumption for a PDG relative to a conventional internal representation as well as execution times for several analysis and optimization steps. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. HEWLETT PACKARD CO,FT COLLINS,CO 80525. NR 32 TC 4 Z9 4 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0038-0644 J9 SOFTWARE PRACT EXPER JI Softw.-Pract. Exp. PD JAN PY 1992 VL 22 IS 1 BP 41 EP 62 DI 10.1002/spe.4380220103 PG 22 WC Computer Science, Software Engineering SC Computer Science GA HA738 UT WOS:A1992HA73800002 ER PT J AU ADAMS, MB TURNER, RS SCHMOYER, DD AF ADAMS, MB TURNER, RS SCHMOYER, DD TI EVALUATION OF DIRECT DELAYED-RESPONSE PROJECT SOIL SAMPLING CLASSES - NORTHEASTERN UNITED-STATES SO SOIL SCIENCE SOCIETY OF AMERICA JOURNAL LA English DT Article ID SURFACE-WATER CHEMISTRY; DISCRIMINANT-ANALYSIS; ACIDIC DEPOSITION; NEW-YORK; REGION AB The Direct/Delayed Response Project (DDRP) identified approximately 600 soils on 145 watersheds in the northeastern USA. Soils were assembled into 38 sampling classes, based on soil characteristics thought to influence surface water chemistry. Multivariate analysis techniques were used to evaluate the utility of the sampling classes. Hydrologic and chemical properties of soils were determined to be the most important for discriminating among the sampling classes. Although sampling class was a statistically significant effect for most soil chemistry variables, only a few sampling classes were particularly distinct (some Entisols, Histosols, and Inceptisols with high base saturation). For most variables, within-sampling-class variability was less than or equal to between-class variability, although this was not true for all of the characteristics evaluated. No better classification approaches were identified in this analysis. The DDRP sampling classes provide a means for grouping soils for efficiency in regional soil sampling, characterization, and aggregation to mapped areas. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV COMP & TELECOMMUN,OAK RIDGE,TN 37831. RP ADAMS, MB (reprint author), US FOREST SERV,NE FOREST EXPT STN,TIMBER & WATERSHED LAB,PARSONS,WV 26287, USA. NR 28 TC 7 Z9 7 U1 0 U2 0 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 SN 0361-5995 J9 SOIL SCI SOC AM J JI Soil Sci. Soc. Am. J. PD JAN-FEB PY 1992 VL 56 IS 1 BP 177 EP 187 PG 11 WC Soil Science SC Agriculture GA HK333 UT WOS:A1992HK33300027 ER PT J AU DIVER, RB FISH, JD LEVITAN, R LEVY, M MEIROVITCH, E ROSIN, H PARIPATYADAR, SA RICHARDSON, JT AF DIVER, RB FISH, JD LEVITAN, R LEVY, M MEIROVITCH, E ROSIN, H PARIPATYADAR, SA RICHARDSON, JT TI SOLAR TEST OF AN INTEGRATED SODIUM REFLUX HEAT PIPE RECEIVER REACTOR FOR THERMOCHEMICAL ENERGY-TRANSPORT SO SOLAR ENERGY LA English DT Article ID CHEMICAL-REACTIONS AB A chemical reactor for carbon dioxide reforming of methane was integrated into a sodium reflux heat pipe receiver and tested in the solar furnace of the Weizmann Institute of Science, Rehovot, Israel. The receiver/reactor was a heat pipe with seven tubes inside an evacuated metal box containing sodium. The catalyst, 0.5 wt% Rh on alumina, filled two of the tubes with the front surface of the box serving as the solar absorber. In operation, concentrated sunlight heated the front plate and vaporized sodium from a wire mesh wick attached to the other side. Sodium vapor condensed on the reactor tubes, releasing latent heat and returning to the wick by gravity. The receiver system performed satisfactorily in many tests under varying flow conditions. The maximum power absorbed was 7.5 kW at temperatures above 800-degrees-C. The feasibility of operating a heat pipe receiver/reactor under solar conditions was proven, and the advantages of reflux devices confirmed. C1 WEIZMANN INST SCI,CTR ENERGY RES,IL-76100 REHOVOT,ISRAEL. UNIV HOUSTON,DEPT CHEM ENGN,HOUSTON,TX 77204. RP DIVER, RB (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 17 TC 27 Z9 27 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-092X J9 SOL ENERGY JI Sol. Energy PY 1992 VL 48 IS 1 BP 21 EP 30 DI 10.1016/0038-092X(92)90173-8 PG 10 WC Energy & Fuels SC Energy & Fuels GA GX522 UT WOS:A1992GX52200004 ER PT J AU PERN, FJ CZANDERNA, AW AF PERN, FJ CZANDERNA, AW TI CHARACTERIZATION OF ETHYLENE VINYL-ACETATE (EVA) ENCAPSULANT - EFFECTS OF THERMAL-PROCESSING AND WEATHERING DEGRADATION ON ITS DISCOLORATION SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article ID PHOTODEGRADATION; PHOTOOXIDATION; POLYETHYLENE AB Ethylene vinyl acetate (EVA) copolymer used as an encapsulant in photovoltaic (PV) modules turns from clear to yellow-brown after four or more years of weathering. EVA films on PV modules stored in the dark at ambient temperature for six years have not degraded. Various analytical methods were used to analyze and characterize the degraded EVA and to determine the cause of discoloration. As a result of degradation, the gel content increased greatly while the UV absorber, Cyasorb UV 531, decreased concomitantly. The increase in the gel content indicates that a cross-linking reaction was dominant in EVA's structural change. Degradation of the polymer near the cover glass surface took place more rapidly and to a greater extent than that next to the solar cells. While EVA remains clear when it retains more than 70% of the initial Cyasorb UV 531 concentration, a moderate increase in the gel content indicates that some degradation occurred without producing the yellow color. Further depletion of Cyasorb during the weathering process resulted in the yellow to brown color in the EVA due to formation of polyconjugated (C = C)n double bonds of various lengths (n > 3). The discoloration deepens as the extent of degradation increases. Acetic acid and other volatile organic components are also produced from the photothermal decomposition of EVA. The EVA discoloration significantly reduces the electrical performance of solar cells. RP PERN, FJ (reprint author), NATL RENEWABLE ENERGY LAB,APPL SCI BRANCH,GOLDEN,CO 80401, USA. NR 25 TC 47 Z9 47 U1 1 U2 20 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JAN PY 1992 VL 25 IS 1-2 BP 3 EP 23 DI 10.1016/0927-0248(92)90013-F PG 21 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA HK661 UT WOS:A1992HK66100001 ER PT J AU BYARS, N ARASTEH, D AF BYARS, N ARASTEH, D TI DESIGN OPTIONS FOR LOW-CONDUCTIVITY WINDOW FRAMES SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article AB The window industry's commercialization of low-emissivity coatings and low-conductivity gas-filling over the past few years has helped to drastically reduce heat transfer rates through the glazed areas of windows. However, few changes have taken place in the design and construction of window frames and edges, leaving these elements to account for most of the heat transfer through today's state-of-the-art windows. This paper presents design and material requirements for the manufacture of low conductivity window frames obtained through the use of finite element computer modeling. Such frames will compliment and not degrade today's most-energy-efficient insulated glass units. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV APPL SCI,BERKELEY,CA 94720. NR 8 TC 4 Z9 4 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD JAN PY 1992 VL 25 IS 1-2 BP 143 EP 148 DI 10.1016/0927-0248(92)90023-I PG 6 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA HK661 UT WOS:A1992HK66100011 ER PT J AU BUDHANI, RC SUENAGA, M WELCH, DO AF BUDHANI, RC SUENAGA, M WELCH, DO TI PINNING, CREEP AND POSSIBLE MELTING IN THE MIXED STATE OF NBZR FILMS SO SOLID STATE COMMUNICATIONS LA English DT Article ID VORTEX-GLASS SUPERCONDUCTIVITY; BA-CU-O; HIGH-TEMPERATURE SUPERCONDUCTORS; HIGH-TC SUPERCONDUCTORS; RESISTIVE TRANSITION; FLUX CREEP; LATTICE; CRYSTAL; FIELD; LINE AB Current-Voltage (I-V) characteristics and resistivity measurements on NbxZr1-x (x approximately 0.15) thin films are reported over a broad range of temperature and magnetic field. In the vicinity of the critical temperature (field) the I-V curves show a transition from the Ohmic to a strongly non-linear behavior on increasing the excitation current density. The linear resistivity is thermally activated with a field dependent barrier height. Although the Ohmic and non-linear data can be described in the framework of the glass model for the mixed state in hard superconductors, it does not yield a universal set of exponents for the glass to fluid transition. The overall response of the mixed state can be understood in the framework of the standard flux-creep theory with inter-vortex interaction. RP BUDHANI, RC (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV MAT SCI,UPTON,NY 11973, USA. NR 27 TC 1 Z9 1 U1 0 U2 2 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 JAN PY 1992 VL 81 IS 2 BP 179 EP 182 DI 10.1016/0038-1098(92)90384-L PG 4 WC Physics, Condensed Matter SC Physics GA HD281 UT WOS:A1992HD28100008 ER PT J AU CRESPI, VH COHEN, ML AF CRESPI, VH COHEN, ML TI POSSIBLE DISCREPANCIES BETWEEN TRANSPORT AND SUPERCONDUCTING ELECTRON-PHONON COUPLINGS DUE TO ANISOTROPIC FERMI-SURFACE NESTING SO SOLID STATE COMMUNICATIONS LA English DT Article ID YBA2CU3O7; BI2SR2CACU2O8; TRANSITION; ABSENCE AB A model with Fermi surface nesting between k points on the same side of a flat Fermi surface can produce a large superconducting electron-phonon coupling constant lambda and simultaneously a small transport electron-phonon coupling constant lambda(tr). C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP CRESPI, VH (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. OI Crespi, Vincent/0000-0003-3846-3193 NR 21 TC 11 Z9 11 U1 0 U2 2 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 JAN PY 1992 VL 81 IS 2 BP 187 EP 189 DI 10.1016/0038-1098(92)90386-N PG 3 WC Physics, Condensed Matter SC Physics GA HD281 UT WOS:A1992HD28100010 ER PT J AU PRESTON, DL WALLACE, DC AF PRESTON, DL WALLACE, DC TI A MODEL OF THE SHEAR MODULUS SO SOLID STATE COMMUNICATIONS LA English DT Article ID ORDER ELASTIC-CONSTANTS AB The shear modulus is modeled at all temperatures and densities. Parameters are provided for twenty-two metals. RP PRESTON, DL (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544, USA. NR 28 TC 28 Z9 29 U1 1 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD JAN PY 1992 VL 81 IS 3 BP 277 EP 281 DI 10.1016/0038-1098(92)90514-A PG 5 WC Physics, Condensed Matter SC Physics GA HE079 UT WOS:A1992HE07900012 ER PT J AU KORNELSEN, K ELDRIDGE, JE WANG, HH CHARLIER, HA WILLIAMS, JM AF KORNELSEN, K ELDRIDGE, JE WANG, HH CHARLIER, HA WILLIAMS, JM TI INFRARED STUDY OF THE METAL-INSULATOR-TRANSITION IN THE ORGANIC CONDUCTOR KAPPA-(BEDT-TTF)2CU[N(CN)2]C1 SO SOLID STATE COMMUNICATIONS LA English DT Article ID OPTICAL-PROPERTIES; SUPERCONDUCTOR; PRESSURE; TEMPERATURE; ABSORPTION; (TMTSF)2X; SALTS; TC AB Measurements of the polarized reflectivity of kappa-(BEDT-TTF)2-Cu[N(CN)2]Cl are presented, from 200 to 5500 cm-1, at temperatures between 10 and 295 K. The optical conductivities for E parallel-to a and E parallel-to c at room temperature are very similar, but develop differently in the mid-infrared as the sample is cooled. Below 50K a large temperature-dependent semiconductor energy-gap develops, with a value of approximately 900 cm-1 at 10K. This has a large effect on the totally symmetric mode of the (BEDT-TTF) molecule near 1300 cm-1, nu(3)(a(g)). The possible cause and form of the energy gap are discussed. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP KORNELSEN, K (reprint author), UNIV BRITISH COLUMBIA,DEPT PHYS,VANCOUVER V6T 2A6,BC,CANADA. NR 22 TC 56 Z9 56 U1 2 U2 8 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 JAN PY 1992 VL 81 IS 4 BP 343 EP 349 DI 10.1016/0038-1098(92)90823-R PG 7 WC Physics, Condensed Matter SC Physics GA HG154 UT WOS:A1992HG15400012 ER PT J AU WANG, JC BATES, JB AF WANG, JC BATES, JB TI NON-DEBYE DIELECTRIC RESPONSE AND DISTRIBUTION OF ACTIVATION-ENERGIES SO SOLID STATE IONICS LA English DT Article ID EMPIRICAL DECAY FUNCTION; FREQUENCY-DEPENDENCE; RELAXATION BEHAVIOUR; ROUGH INTERFACE; WILLIAMS-WATTS; FRACTAL MODEL; AC RESPONSE; DYNAMICS; SYSTEMS AB The non-Debye dielectric response is characterized by a broad loss peak and a constant-phase-angle behavior at frequencies above the loss peak. In this work, the main features of the distribution of activation energies, G(E), for some empirical functions frequently used to describe this behavior, such as the Havriliak-Negami and the Williams-Watts functions, are analyzed and compared with the double-exponential G(E) obtained from the ion-hopping model. A possible basis for the ion-hopping model and its relation with the Debye model are discussed. RP WANG, JC (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 40 TC 29 Z9 29 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2738 J9 SOLID STATE IONICS JI Solid State Ion. PD JAN PY 1992 VL 50 IS 1-2 BP 75 EP 86 DI 10.1016/0167-2738(92)90039-R PG 12 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HJ954 UT WOS:A1992HJ95400010 ER PT J AU CHIARIZIA, R HORWITZ, EP AF CHIARIZIA, R HORWITZ, EP TI DILUENT EFFECTS IN THE EXTRACTION OF AM(III) FROM NITRIC-ACID SOLUTIONS BY SELECTED CARBAMOYL-PHOSPHORYL EXTRACTANTS AND RELATED MONOFUNCTIONAL COMPOUNDS SO SOLVENT EXTRACTION AND ION EXCHANGE LA English DT Article ID SELECTIVITY; OXIDES AB The extraction of Am(III) from nitric acid solutions by a series of bifunctional extractants containing the carbamoylphosphoryl moiety and of monofunctional extractants containing the P = O donor group, has been investigated using a number of different diluents. In some diluents, such as chloroform, dichloroethane and nitrobenzene, the existence of an apparently anomalous order of Am(III) extraction (that is higher metal extraction for lower basicity of the extractant) has been confirmed with phenyl substituted carbamoylmethylphosphine oxides. No evidence of anomalies was found in other diluents, for example carbon tetrachloride, tetrachloroethylene and o-xylene. While it seems unlikely that the "anomalous aryl strengthening" effect, recently reported in the soviet literature, can account for the extraction behavior of Am(III) by the bifunctional extractants and diluents investigated in this work, the apparent anomalies have been simply explained by strong solvation effects between the diluent and the very basic extractants. RP CHIARIZIA, R (reprint author), ARGONNE NATL LAB,DIV CHEM,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 11 TC 41 Z9 42 U1 1 U2 2 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0736-6299 J9 SOLVENT EXTR ION EXC JI Solvent Extr. Ion Exch. PY 1992 VL 10 IS 1 BP 101 EP 118 DI 10.1080/07366299208918094 PG 18 WC Chemistry, Multidisciplinary SC Chemistry GA HA759 UT WOS:A1992HA75900006 ER PT J AU HORWITZ, EP CHIARIZIA, R DIETZ, ML AF HORWITZ, EP CHIARIZIA, R DIETZ, ML TI A NOVEL STRONTIUM-SELECTIVE EXTRACTION CHROMATOGRAPHIC RESIN SO SOLVENT EXTRACTION AND ION EXCHANGE LA English DT Article ID NITRIC-ACID SOLUTIONS; SEPARATION AB The effect of nitric acid concentration on the selectivity of a novel extraction chromatographic resin consisting of an octanol solution of 4,4'(5')-bis(t-butyl-cyclohexano)-18-crown-6 sorbed on an inert polymeric support for strontium over a number of alkali, alkaline earth, and other metal cations was evaluated. The effect of macro quantities of selected elements on strontium retention by the resin was also examined. The resin is shown to exhibit excellent selectivity for strontium over nearly all of the test elements; only lead and tetravalent neptunium, polonium, and plutonium show significant affinity for the material. In addition, concentrations of calcium or sodium ion up to approximately 0.1 M underbar are shown not to diminish the sorption of strontium appreciably. Several useful radiochemical separation schemes devised on the basis of the results obtained are described. RP HORWITZ, EP (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 35 TC 424 Z9 438 U1 6 U2 61 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0736-6299 J9 SOLVENT EXTR ION EXC JI Solvent Extr. Ion Exch. PY 1992 VL 10 IS 2 BP 313 EP 336 DI 10.1080/07366299208918107 PG 24 WC Chemistry, Multidisciplinary SC Chemistry GA HJ663 UT WOS:A1992HJ66300008 ER PT J AU CHIARIZIA, R HORWITZ, EP DIETZ, ML AF CHIARIZIA, R HORWITZ, EP DIETZ, ML TI ACID DEPENDENCY OF THE EXTRACTION OF SELECTED METAL-IONS BY A STRONTIUM-SELECTIVE EXTRACTION CHROMATOGRAPHIC RESIN - CALCULATED VS EXPERIMENTAL CURVES SO SOLVENT EXTRACTION AND ION EXCHANGE LA English DT Article AB The extraction of selected divalent (Ca+2, Sr+2, Ba+2, Ra+2, Pb+2, UO2+2) and monovalent (Na+, K+, Rb+, Cs+, Tl+) metal cations at tracer concentration level by a recently introduced strontium-selective extraction chromatographic resin has been studied as function of the nitric acid concentration in the range approximately 0.1-7 M underbar. The data have been explained by combining the metal extraction, the acid extraction, and the aqueous phase metal complexation equilibria. Conditional metal extraction equilibrium constants have been estimated by using calculated activity coefficients of the metal nitrate salts in the nitric acid solutions. The extraction constants have been used to predict the effect of macroconcentrations of sample matrix constituents on the extraction of Sr+2 or Pb+2 by the strontium-selective resin. RP CHIARIZIA, R (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 15 TC 90 Z9 91 U1 0 U2 7 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0736-6299 J9 SOLVENT EXTR ION EXC JI Solvent Extr. Ion Exch. PY 1992 VL 10 IS 2 BP 337 EP 361 DI 10.1080/07366299208918108 PG 25 WC Chemistry, Multidisciplinary SC Chemistry GA HJ663 UT WOS:A1992HJ66300009 ER PT J AU NEKIMKEN, HL SMITH, BF JARVINEN, GD BARTHOLDI, CS AF NEKIMKEN, HL SMITH, BF JARVINEN, GD BARTHOLDI, CS TI SEPARATION STUDIES OF YTTRIUM(III) AND LANTHANIDE(III) IONS WITH 4-BENZOYL-2,4-DIHYDRO-5-METHYL-2-PHENYL-3H-PYRAZOL-3-THIONE AND TRIOCTYLPHOSPHINE OXIDE USING A ROBOTIC EXTRACTION SYSTEM SO SOLVENT EXTRACTION AND ION EXCHANGE LA English DT Article ID LIGAND CHELATE EXTRACTION; AM(III); EU(III); TOPO AB We studied the extraction of trivalent Y, La, Pr, Nd, Sm, Eu, Gd, Dy, Er, and Lu from aqueous perchlorate solutions using a mixture of 4-benzoyl-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-thione (HBMPPT) and trioctylphosphine oxide (TOPO). The metal ion distribution coefficients (D-values) as a function of increasing lanthanide atomic number increased initially, reached a maximum value at Nd, then decreased to a nearly constant value for Gd and the later lanthanides. The D-values vary slightly across the lanthanide series, the maximum difference being a factor of 14 between La and Nd. Analysis of the slopes of plots of log D versus pH, log [HBMPPT], and log [TOPO] indicated that the stoichiometries of the extraction complexes varied across die lanthanide series showing a decrease in the number of HBMPPT (and/or BMPPT) units and an increase in the number of TOPO molecules involved in the major extraction species. This extraction system can provide a good way to separate the trivalent actinides from the trivalent lanthanides. RP NEKIMKEN, HL (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 21 TC 7 Z9 7 U1 0 U2 2 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0736-6299 J9 SOLVENT EXTR ION EXC JI Solvent Extr. Ion Exch. PY 1992 VL 10 IS 3 BP 419 EP 429 DI 10.1080/07366299208918112 PG 11 WC Chemistry, Multidisciplinary SC Chemistry GA HW643 UT WOS:A1992HW64300002 ER PT J AU HANNINK, NJ HOFFMAN, DC SMITH, BF AF HANNINK, NJ HOFFMAN, DC SMITH, BF TI EXTRACTION STUDIES OF SELECTED ACTINIDE IONS FROM AQUEOUS-SOLUTIONS WITH 4-BENZOYL-2,4-DIHYDRO-5-METHYL-2-PHENYL-3H-PYRAZOL-3-THIONE AND TRI-N-OCTYLPHOSPHINE OXIDE SO SOLVENT EXTRACTION AND ION EXCHANGE LA English DT Article ID AM(III); EU(III); TOPO AB The first measurements of distribution coefficients (K(d)) for Cm(III), Bk(III), Cf(III), Es(III), and Fm(III) between aqueous perchlorate solutions and solutions of 4-benzoyl-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-thione (BMPPT) and the synergist tri-n-octylphosphine oxide (TOPO) in toluene are reported. Curium-243, berkelium-250, californium-249, einsteinium-254, and fermium-253 were used in these studies. The K(d) for Am-241 was also measured and is in agreement with previously published results. Our new results show that the K(d)'s decrease gradually with increasing atomic number for the actinides with a dip at Cf. In general, the K(d)'s for these actinides are about about a factor of 10 greater than the K(d)'s for the homologous lanthanides at a pH of 2.9, a BMPPT concentration of 0.2 M, and a TOPO concentration of 0.04 M. The larger K(d)'s for the actinides are consistent with greater covalent bonding between the actinide metal ion and the sulfur bonding site in the ligand. C1 LOS ALAMOS NATL LAB,ANALYT CHEM GRP,LOS ALAMOS,NM 87545. RP HANNINK, NJ (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,MS 70A-3307,BERKELEY,CA 94720, USA. NR 9 TC 4 Z9 4 U1 2 U2 7 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0736-6299 J9 SOLVENT EXTR ION EXC JI Solvent Extr. Ion Exch. PY 1992 VL 10 IS 3 BP 431 EP 438 DI 10.1080/07366299208918113 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA HW643 UT WOS:A1992HW64300003 ER PT J AU MINCHER, BJ AF MINCHER, BJ TI A SLOPE ANALYSIS INVESTIGATION OF THE TRIVALENT F-SERIES METAL CMPO COMPLEX SO SOLVENT EXTRACTION AND ION EXCHANGE LA English DT Article ID NITRIC-ACID; EXTRACTANTS AB A slope analysis investigation of the complex formed by trivalent actinides and lanthanides with CMPO was performed to determine the solvation number. A set of limiting conditions was chosen such that chemical concentrations approximated activities and the metal distribution ratios were measured versus CMPO concentration. The solvation number determined from these measurements was four, rather than the expected value of three, over a wide range of ionic radii. RP MINCHER, BJ (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. RI Mincher, Bruce/C-7758-2017 NR 12 TC 12 Z9 12 U1 0 U2 1 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0736-6299 J9 SOLVENT EXTR ION EXC JI Solvent Extr. Ion Exch. PY 1992 VL 10 IS 4 BP 615 EP 622 DI 10.1080/07366299208918124 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA JE634 UT WOS:A1992JE63400004 ER PT J AU STUMP, NA DAI, S DELCUL, GD PETERSON, JR AF STUMP, NA DAI, S DELCUL, GD PETERSON, JR TI ABSORPTION-SPECTRUM FROM EUROPIUM IONS IN EUROPIUM OXYCHLORIDE, EUOCL SO SPECTROSCOPY LETTERS LA English DT Article DE EUOCL; ELECTRONIC SPECTRUM; ABSORPTION SPECTROSCOPY ID CRYSTAL-FIELD AB We have recorded part of the UV-visible region of the electronic spectrum of EuOCl at both 292 and 77 K by diffuse reflectance spectroscopy. Illumination of the sample and collection of the reflected light was accomplished through the use of an all-quartz fiberoptic probe. Several absorption maxima were observed which result from transitions from the F-7(0) ground state and F-7(1) excited state to the 5D4, 5G2,4,6, 5L6, and 5D3 excited states of the Eu3+ ion. C1 OAK RIDGE NATL LAB,DIV CHEM,TRANSURANIUM RES LAB,POB 2008,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DEPT CHEM,DIV TECH,OAK RIDGE,TN 37831. RI Dai, Sheng/K-8411-2015 OI Dai, Sheng/0000-0002-8046-3931 NR 15 TC 1 Z9 1 U1 4 U2 7 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0038-7010 J9 SPECTROSC LETT JI Spectr. Lett. PY 1992 VL 25 IS 7 BP 1003 EP 1010 DI 10.1080/00387019208018210 PG 8 WC Spectroscopy SC Spectroscopy GA JU559 UT WOS:A1992JU55900009 ER PT J AU STUMP, NA SCHWEITZER, GK PESTERFIELD, LL PETERSON, JR MURRAY, GM AF STUMP, NA SCHWEITZER, GK PESTERFIELD, LL PETERSON, JR MURRAY, GM TI SYNTHESIS AND SPECTRAL STUDY OF SEVERAL SOLID M3[EU(2,6-PYRIDINEDICARBOXYLATE)3] SALTS (M = LI+, NA+, K+, RB+, CS+, NH4+, AND PYRIDINIUM+) SO SPECTROSCOPY LETTERS LA English DT Article DE EU-3+ LUMINESCENCE; 2,6-PYRIDINEDICARBOXYLATE; COUNTERION EFFECT ID RARE-EARTH CARBOXYLATES; CIRCULARLY POLARIZED LUMINESCENCE; MOLECULAR STRUCTURE; AQUEOUS-SOLUTION; CRYSTAL; COMPLEXES AB Salts of the [Eu(2,6-pyridinedicarboxylate)3]3- complex anion and various monovalent inorganic and organic counterions (Li+, Na+, K+, Rb+, Cs+, NH4+, and pyridinium+) have been synthesized and studied by emission spectroscopy. The Eu3+ ion emission spectra exhibited by these salts have been observed with high resolution (less than 1.0 cm-1) and at low temperature (77 K). The emission spectra of these compounds indicate that changing the attached counterion does not affect the site symmetry observed by the europium ion beyond slight distortions indicated by small shifts in the energies of the Eu3+, electronic levels. C1 UNIV MARYLAND,DEPT CHEM,CATONSVILLE,MD 21228. WESTERN KENTUCKY UNIV,DEPT CHEM,BOWLING GREEN,KY 42101. OAK RIDGE NATL LAB,DIV CHEM,TRANSURANIUM RES LAB,OAK RIDGE,TN 37831. RP STUMP, NA (reprint author), UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996, USA. RI Murray, George/A-6625-2011 NR 18 TC 11 Z9 11 U1 0 U2 2 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0038-7010 J9 SPECTROSC LETT JI Spectr. Lett. PY 1992 VL 25 IS 8 BP 1421 EP 1432 DI 10.1080/00387019208017874 PG 12 WC Spectroscopy SC Spectroscopy GA KA966 UT WOS:A1992KA96600020 ER PT J AU CLEM, JR AF CLEM, JR TI FUNDAMENTALS OF VORTICES IN THE HIGH-TEMPERATURE SUPERCONDUCTORS SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WORKSHOP ON CRITICAL CURRENTS CY JUL 07-11, 1991 CL CHURCH COLL, CAMBRIDGE, ENGLAND SP CAMBRIDGE UNIV HO CHURCH COLL ID HIGH-TC SUPERCONDUCTORS; MAGNETIC-PROPERTIES; II SUPERCONDUCTORS; CRITICAL-FIELD; ANISOTROPY AB Strong anisotropy of the high-temperature superconductors affects their vortex structure and flux pinning. In this paper the structure of vortices in these materials is briefly described using the Lawrence-Doniach model, in which superconducting layers are Josephson-coupled. Close to the transition temperature, the model reduces to the anisotropic Ginzburg-Landau theory, but at low temperatures when the magnetic field is parallel to the layers, the vortices have Josephson cores, rather than Abrikosov cores. At other field angles, vortex lines can be represented as two-dimensional pancake vortices in individual layers, connected by Josephson strings. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP CLEM, JR (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 33 TC 22 Z9 22 U1 0 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD JAN PY 1992 VL 5 SU 1 BP S33 EP S40 DI 10.1088/0953-2048/5/1S/006 PG 8 WC Physics, Applied; Physics, Condensed Matter SC Physics GA HE355 UT WOS:A1992HE35500007 ER PT J AU KRITSCHA, W SAUERZOPF, FM WEBER, HW CRABTREE, GW CHANG, YC JIANG, PZ AF KRITSCHA, W SAUERZOPF, FM WEBER, HW CRABTREE, GW CHANG, YC JIANG, PZ TI CRITICAL CURRENTS AND MAGNETIZATION OF BI2SR2CACU2O8 SINGLE-CRYSTALS SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WORKSHOP ON CRITICAL CURRENTS CY JUL 07-11, 1991 CL CHURCH COLL, CAMBRIDGE, ENGLAND SP CAMBRIDGE UNIV HO CHURCH COLL ID BEAN MODEL; IRRADIATION AB A single crystal of Bi2Sr2CaCu2O8 was exposed to fast neutron irradiation to fluences of 5 x 10(20)m-2 and 2.5 x 10(21)m-2 (E > 0.1MeV). D.c. magnetization measurements were made with an 8T - SQUID magnetometer in order to study the influence of radiation-induced defects on flux pinning. For the lower fluence we find an enhancement of pinning and a shift of the irreversibility line only up to 2 T. After irradiation to a fluence of 2.5 x 10(21)m-2, where the defect density is higher, the irreversibility line is shifted for all measured fields to higher temperatures. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP KRITSCHA, W (reprint author), UNIV WIEN,ATOMINST OSTERREICHISCHEN,A-1020 VIENNA,AUSTRIA. NR 13 TC 3 Z9 3 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD JAN PY 1992 VL 5 SU 1 BP S232 EP S235 DI 10.1088/0953-2048/5/1S/051 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA HE355 UT WOS:A1992HE35500052 ER PT J AU NAVARRO, R CAMPBELL, LJ AF NAVARRO, R CAMPBELL, LJ TI 3-DIMENSIONAL SOLUTION OF CRITICAL STATE MODELS - AC HYSTERESIS LOSSES SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WORKSHOP ON CRITICAL CURRENTS CY JUL 07-11, 1991 CL CHURCH COLL, CAMBRIDGE, ENGLAND SP CAMBRIDGE UNIV HO CHURCH COLL ID SUPERCONDUCTORS AB The alternating field, hysteretic power losses in strongly pinned superconducting spheres and spheroids are studied within the Bean-London Model. Analytic solutions for small flux penetration and numerical determination for arbitrary applied field are presented. By changing the eccentricity, geometries from needles to flat discs may be analyzed. RP NAVARRO, R (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 16 TC 7 Z9 7 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD JAN PY 1992 VL 5 SU 1 BP S200 EP S203 DI 10.1088/0953-2048/5/1S/043 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA HE355 UT WOS:A1992HE35500044 ER PT J AU NAVARRO, R CAMPBELL, LJ AF NAVARRO, R CAMPBELL, LJ TI INTERGRANULAR FIELDS AND JOSEPHSON CRITICAL CURRENTS IN HTS CERAMICS SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WORKSHOP ON CRITICAL CURRENTS CY JUL 07-11, 1991 CL CHURCH COLL, CAMBRIDGE, ENGLAND SP CAMBRIDGE UNIV HO CHURCH COLL ID HIGH-TC SUPERCONDUCTORS AB The critical current J(c) of a granular HTS is modeled by Josephson type junctions to describe the weak-link network and by effective medium theories to estimate the magnetic field at the junctions. Previous theoretical work for H < H(c1) has been reproduce and extended for H > H(c1). Intergranular fields inconsistent with earlier suppositions on J(c)(H) hysteresis are found. RP NAVARRO, R (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 17 TC 7 Z9 7 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD JAN PY 1992 VL 5 SU 1 BP S121 EP S124 DI 10.1088/0953-2048/5/1S/023 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA HE355 UT WOS:A1992HE35500024 ER PT J AU POLONKA, J XU, M GOLDMAN, AI FINNEMORE, DK LI, Q AF POLONKA, J XU, M GOLDMAN, AI FINNEMORE, DK LI, Q TI MELTING AND FREEZING OF BI-SR-CA-CU-O COMPOUNDS SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WORKSHOP ON CRITICAL CURRENTS CY JUL 07-11, 1991 CL CHURCH COLL, CAMBRIDGE, ENGLAND SP CAMBRIDGE UNIV HO CHURCH COLL AB High temperature x-ray studies have been carried out for the melting and refreezing of Bi2Sr2Ca1Cu2O8-delta and Bi2Sr2Ca1Cu2O8-delta/Ag composites in order to develop methods to refine the microstructure of these conductors. At least three different insulating phases are stable in the 870 to 890-degrees-C temperature range, (Sr,Ca)1Cu1O2, (Sr,Ca)2Cu1O3 and (S,Ca)O. These Bi-poor compounds nucleate and grow on a time scale of a few minutes, but the Bi(2212) supercools a great deal and is not observed to nucleate and grow for periods of an hour at temperatures above 820-degrees-C. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP POLONKA, J (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 2 TC 4 Z9 4 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD JAN PY 1992 VL 5 SU 1 BP S157 EP S160 DI 10.1088/0953-2048/5/1S/032 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA HE355 UT WOS:A1992HE35500033 ER PT J AU PORTIS, AM COOKE, DW AF PORTIS, AM COOKE, DW TI SUPERCONDUCTING STRIPLINE MODEL OF INTERGRANULAR FLUX-PENETRATION SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WORKSHOP ON CRITICAL CURRENTS CY JUL 07-11, 1991 CL CHURCH COLL, CAMBRIDGE, ENGLAND SP CAMBRIDGE UNIV HO CHURCH COLL ID FILMS AB A stripline model is successfully applied to an analysis of the surface impedance of a granular superconductor. When the core of the stripline is a resistively shunted Josephson junction, the surface resistance increases with the square of the frequency. A dc magnetic field increases the Josephson inductivity, leading to increased surface resistance and flux penetration. Critical flux penetration of the granular surfaces bordering the junction leads to critical behavior of the stripline. At high power level, a dc magnetic field similarly increases the Josephson inductivity with further increase in surface impedance. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP PORTIS, AM (reprint author), UNIV CALIF BERKELEY,BERKELEY,CA 94720, USA. NR 13 TC 9 Z9 9 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD JAN PY 1992 VL 5 SU 1 BP S395 EP S398 DI 10.1088/0953-2048/5/1S/091 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA HE355 UT WOS:A1992HE35500092 ER PT J AU SAUERZOPF, FM WIESINGER, HP WEBER, HW CRABTREE, GW FRISCHHERZ, MC KIRK, MA AF SAUERZOPF, FM WIESINGER, HP WEBER, HW CRABTREE, GW FRISCHHERZ, MC KIRK, MA TI ANISOTROPIC SHIFT OF THE IRREVERSIBILITY LINE BY NEUTRON-IRRADIATION SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WORKSHOP ON CRITICAL CURRENTS CY JUL 07-11, 1991 CL CHURCH COLL, CAMBRIDGE, ENGLAND SP CAMBRIDGE UNIV HO CHURCH COLL ID FLUX CREEP; SUPERCONDUCTORS; CRYSTALS AB The irreversibility line of high-T(c) superconductors is shifted considerably by irradiating the material with fast neutrons. The anisotropic and non-monotonous shift is qualitatively explained by a simple model based on an interaction between three pinning mechanisms, the intrinsic pinning by the ab-planes, the weak pinning by the pre-irradiation defect structure, and strong pinning by neutron induced defect cascades. A correlation between the cascade density and the position of the irreversibility line is observed. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP SAUERZOPF, FM (reprint author), UNIV VIENNA,INST ATOM,A-1020 VIENNA,AUSTRIA. NR 19 TC 4 Z9 4 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD JAN PY 1992 VL 5 SU 1 BP S105 EP S108 DI 10.1088/0953-2048/5/1S/019 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA HE355 UT WOS:A1992HE35500020 ER PT J AU SCHALK, RM WEBER, HW BARBER, ZH DAVIES, CE EVETTS, JE SOMEKH, RE KIM, DH AF SCHALK, RM WEBER, HW BARBER, ZH DAVIES, CE EVETTS, JE SOMEKH, RE KIM, DH TI CRITICAL CURRENTS IN SPUTTERED YBCO FILMS SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WORKSHOP ON CRITICAL CURRENTS CY JUL 07-11, 1991 CL CHURCH COLL, CAMBRIDGE, ENGLAND SP CAMBRIDGE UNIV HO CHURCH COLL ID CRITICAL CURRENT-DENSITY; II SUPERCONDUCTORS AB The angular dependence of J(c) was investigated for c-axis oriented sputtered YBCO films. The observed features can be described neither by a 2D- nor by a 3D- anisotropic Ginzburg-Landau theory. An intrinsic pinning mechanism, effective only within a critical angle V(c) between the applied magnetic field and the copper oxide planes, has to be considered in order to describe the sharp and narrow peaks of J(c) at high fields and high temperatures. Neutron irradiation results also seem to be in favour of an intrinsic pinning model. C1 UNIV CAMBRIDGE,DEPT MAT SCI & MET,CAMBRIDGE,ENGLAND. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP SCHALK, RM (reprint author), UNIV VIENNA,INST ATOM,A-1020 VIENNA,AUSTRIA. NR 7 TC 8 Z9 8 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD JAN PY 1992 VL 5 SU 1 BP S224 EP S227 DI 10.1088/0953-2048/5/1S/049 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA HE355 UT WOS:A1992HE35500050 ER PT J AU SUENAGA, M WELCH, DO BUDHANI, R AF SUENAGA, M WELCH, DO BUDHANI, R TI MAGNETICALLY MEASURED IRREVERSIBILITY TEMPERATURES IN SUPERCONDUCTING OXIDES AND ALLOYS SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WORKSHOP ON CRITICAL CURRENTS CY JUL 07-11, 1991 CL CHURCH COLL, CAMBRIDGE, ENGLAND SP CAMBRIDGE UNIV HO CHURCH COLL ID SINGLE-CRYSTAL YBA2CU3O7; HIGH-TC SUPERCONDUCTORS; BA-CU-O; MECHANICAL MEASUREMENTS; RESISTIVE TRANSITION; VORTEX-LATTICE; FLUX; BI2.2SR2CA0.8CU2O8; CREEP; FILMS AB Irreversibility temperatures T(r)(H) were magnetically measured for the aligned powders of superconducting oxides, La1.85Sr0.15CuO4, YBa2Cu3O7, Bi2Sr2CaCu2O8, and Bi2Sr2Ca2Cu3O10, and for the metallic superconductors, Nb, Nb-Ti, Nb3Sn and PbMo6S8. the results are briefly discussed in terms of the thermally activated flux creep and the lattice or the glass melting models for the irreversibility temperatures. Also, the measurement procedures for T(r)(H) using a SQUID magnetometer are described in detail, since the measuring methods and the criteria which are used for T(r)(H) are important in the determination and interpretation of the temperatures. RP SUENAGA, M (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 32 TC 40 Z9 40 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD JAN PY 1992 VL 5 SU 1 BP S1 EP S8 DI 10.1088/0953-2048/5/1S/001 PG 8 WC Physics, Applied; Physics, Condensed Matter SC Physics GA HE355 UT WOS:A1992HE35500002 ER PT J AU WELCH, DO AF WELCH, DO TI MODELS OF FLUX DIFFUSION AND FLUX CREEP IN HIGH-TEMPERATURE SUPERCONDUCTORS SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WORKSHOP ON CRITICAL CURRENTS CY JUL 07-11, 1991 CL CHURCH COLL, CAMBRIDGE, ENGLAND SP CAMBRIDGE UNIV HO CHURCH COLL ID HIGH-TC SUPERCONDUCTORS; VORTICES; MOTION AB Some aspects of the phenomenological modelling of the kinetics of magnetic flux diffusion and creep in high-temperature superconductors in the low-temperature flux-creep regime are discussed with emphasis on the effects of the current-dependence of the activation energy. Flux creep by quantum tunneling is also discussed. RP WELCH, DO (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. NR 21 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD JAN PY 1992 VL 5 SU 1 BP S109 EP S112 DI 10.1088/0953-2048/5/1S/020 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA HE355 UT WOS:A1992HE35500021 ER PT J AU MASCARENHAS, A ALONSO, RG HORNER, GS FROYEN, S HSIEH, KC CHENG, KY AF MASCARENHAS, A ALONSO, RG HORNER, GS FROYEN, S HSIEH, KC CHENG, KY TI EXPERIMENTAL-EVIDENCE FOR A SPONTANEOUSLY GENERATED EFFECTIVE MASS LATERAL SUPERLATTICE SO SUPERLATTICES AND MICROSTRUCTURES LA English DT Article ID BAND-GAPS; ALLOYS; SEMICONDUCTORS; MODULATION C1 UNIV ILLINOIS,DEPT ELECT & COMP ENGN,URBANA,IL 61801. RP MASCARENHAS, A (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 15 TC 17 Z9 17 U1 0 U2 1 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0749-6036 J9 SUPERLATTICE MICROST JI Superlattices Microstruct. PY 1992 VL 12 IS 1 BP 57 EP 61 DI 10.1016/0749-6036(92)90220-Y PG 5 WC Physics, Condensed Matter SC Physics GA JX124 UT WOS:A1992JX12400009 ER PT J AU LUSCOMBE, JH BOUCHARD, AM LUBAN, M AF LUSCOMBE, JH BOUCHARD, AM LUBAN, M TI SELF-CONSISTENT SCREENING POTENTIALS IN QUANTUM NANOSTRUCTURES - ROLE OF CONFINED STATES SO SUPERLATTICES AND MICROSTRUCTURES LA English DT Article C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES LAB,AMES,IA 50011. RP LUSCOMBE, JH (reprint author), TEXAS INSTRUMENTS INC,CENT LABS,DALLAS,TX 75265, USA. NR 6 TC 2 Z9 2 U1 0 U2 1 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0749-6036 J9 SUPERLATTICE MICROST JI Superlattices Microstruct. PY 1992 VL 11 IS 3 BP 357 EP 359 DI 10.1016/0749-6036(92)90398-O PG 3 WC Physics, Condensed Matter SC Physics GA HN107 UT WOS:A1992HN10700025 ER PT J AU FONG, CY GALLUP, RF NELSON, JS CHANG, LL ESAKI, L AF FONG, CY GALLUP, RF NELSON, JS CHANG, LL ESAKI, L TI APPLICATION OF THE KOHN-SHAM FORMALISM TO QUANTUM DOTS WITH REALISTIC DIMENSIONS AND CONSTRICTIONS SO SUPERLATTICES AND MICROSTRUCTURES LA English DT Article ID ELECTRONIC-PROPERTIES; STATES C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. RP FONG, CY (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. RI Esaki, Leo/B-2776-2011 NR 13 TC 2 Z9 2 U1 0 U2 1 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0749-6036 J9 SUPERLATTICE MICROST JI Superlattices Microstruct. PY 1992 VL 11 IS 4 BP 399 EP 402 DI 10.1016/0749-6036(92)90196-C PG 4 WC Physics, Condensed Matter SC Physics GA JF717 UT WOS:A1992JF71700006 ER PT B AU LI, DQ HUCKETT, SC FRANKCOM, T PAFFETT, MT FARR, JD HAWLEY, ME GOTTESFELD, S THOMPSON, JD BURNS, CJ SWANSON, BI AF LI, DQ HUCKETT, SC FRANKCOM, T PAFFETT, MT FARR, JD HAWLEY, ME GOTTESFELD, S THOMPSON, JD BURNS, CJ SWANSON, BI BE BEIN, T TI SYNTHESIS AND PROPERTIES OF NOVEL LOW-DIMENSIONAL RUTHENIUM MATERIALS - SELF-ASSEMBLED MULTILAYERS AND MIXED INORGANIC ORGANIC POLYMERS SO SUPRAMOLECULAR ARCHITECTURE: SYNTHETIC CONTROL IN THIN FILMS AND SOLIDS SE ACS SYMPOSIUM SERIES LA English DT Review CT SYMP ON SUPRAMOLECULAR ARCHITECTURE, AT THE 201ST NATIONAL MEETING OF THE AMERICAN CHEMICAL SOC CY APR 14-19, 1991 CL ATLANTA, GA SP AMER CHEM SOC, DIV INORGAN CHEM RP LI, DQ (reprint author), LOS ALAMOS NATL LAB,INORGAN & STRUCT CHEM GRP INC 4,LOS ALAMOS,NM 87545, USA. NR 0 TC 9 Z9 9 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA WASHINGTON BN 0-8412-2460-9 J9 ACS SYM SER PY 1992 VL 499 BP 33 EP 45 PG 13 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic; Chemistry, Physical SC Chemistry GA BW18J UT WOS:A1992BW18J00004 ER PT B AU RIEKE, PC TARASEVICH, BJ BENTJEN, SB FRYXELL, GE CAMPBELL, AA AF RIEKE, PC TARASEVICH, BJ BENTJEN, SB FRYXELL, GE CAMPBELL, AA BE BEIN, T TI BIOMIMETIC THIN-FILM SYNTHESIS SO SUPRAMOLECULAR ARCHITECTURE: SYNTHETIC CONTROL IN THIN FILMS AND SOLIDS SE ACS SYMPOSIUM SERIES LA English DT Review CT SYMP ON SUPRAMOLECULAR ARCHITECTURE, AT THE 201ST NATIONAL MEETING OF THE AMERICAN CHEMICAL SOC CY APR 14-19, 1991 CL ATLANTA, GA SP AMER CHEM SOC, DIV INORGAN CHEM RP RIEKE, PC (reprint author), BATTELLE MEM INST,PACIFIC NW LABS,DEPT MAT SCI,RICHLAND,WA 99352, USA. NR 0 TC 14 Z9 14 U1 2 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA WASHINGTON BN 0-8412-2460-9 J9 ACS SYM SER PY 1992 VL 499 BP 61 EP 75 PG 15 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic; Chemistry, Physical SC Chemistry GA BW18J UT WOS:A1992BW18J00006 ER PT B AU CARRADO, KA ANDERSON, KB GRUTKOSKI, PS AF CARRADO, KA ANDERSON, KB GRUTKOSKI, PS BE BEIN, T TI THERMAL-ANALYSIS OF PORPHYRIN CLAY COMPLEXES SO SUPRAMOLECULAR ARCHITECTURE: SYNTHETIC CONTROL IN THIN FILMS AND SOLIDS SE ACS SYMPOSIUM SERIES LA English DT Review CT SYMP ON SUPRAMOLECULAR ARCHITECTURE, AT THE 201ST NATIONAL MEETING OF THE AMERICAN CHEMICAL SOC CY APR 14-19, 1991 CL ATLANTA, GA SP AMER CHEM SOC, DIV INORGAN CHEM RP CARRADO, KA (reprint author), ARGONNE NATL LAB,DIV CHEM 200,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 0 TC 4 Z9 4 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA WASHINGTON BN 0-8412-2460-9 J9 ACS SYM SER PY 1992 VL 499 BP 155 EP 165 PG 11 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic; Chemistry, Physical SC Chemistry GA BW18J UT WOS:A1992BW18J00012 ER PT J AU KAWASAKI, M VANDENTOP, GJ SOMORJAI, GA AF KAWASAKI, M VANDENTOP, GJ SOMORJAI, GA TI THE EFFECT OF ION ENERGY ON THE FORMATION OF THE SILICON-CARBIDE INTERFACE OF HYDROGENATED AMORPHOUS-CARBON FILMS GROWN ON SILICON BY PLASMA ASSISTED CHEMICAL VAPOR-DEPOSITION SO SURFACE SCIENCE LA English DT Article ID RAY PHOTOELECTRON-SPECTROSCOPY AB The interface of hydrogenated amorphous carbon films grown on single crystal silicon by plasma assisted chemical vapor deposition from methane was studied by angle-resolved X-ray photoelectron spectroscopy. The effect of varying RF power for films grown on a RF-powered electrode was investigated, as well as the effect of varying pulse height for films grown under high voltage pulsed biasing on a non-RF-powered electrode. The spectra of the films deposited at the powered electrode revealed the presence of an approximately stoichiometric silicon carbide layer at the interface. In contrast, the interfacial carbide for films formed at the pulsed biased electrode was found to be nonstoichiometric and silicon rich, which could be ascribed to the relatively much smaller high-energy ion flux to the substrate. The effective thickness of the interfacial layer, as determined from the angle-resolved spectra, however, correlated well with the kinetic energy of plasma ions impinging on the silicon substrate, regardless of the average stoichiometry. The thickness varied from approximately 4 to 12 angstrom for kinetic energies ranging from approximately 150 to 1100 eV. The results indicate that the thickness of the interfacial carbide is determined by the average penetration depth of plasma ions into the silicon substrate, as controlled by their kinetic energy. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720. NR 18 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JAN PY 1992 VL 260 IS 1-3 BP 85 EP 96 DI 10.1016/0039-6028(92)90021-W PG 12 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HB017 UT WOS:A1992HB01700016 ER PT J AU POWERS, JM WANDER, A VANHOVE, MA SOMORJAI, GA AF POWERS, JM WANDER, A VANHOVE, MA SOMORJAI, GA TI STRUCTURAL-ANALYSIS OF THE BETA-SIC(100)-(2X1) SURFACE RECONSTRUCTION BY AUTOMATED TENSOR LEED SO SURFACE SCIENCE LA English DT Letter AB The atomic structure of the beta-SiC(100)-(2 x 1) surface was analyzed using dynamical calculations of low energy electron diffraction (LEED) intensities measured with a video camera. Surface composition was monitored using Auger electron spectroscopy (AES). The LEED calculations utilized our recently developed automated tensor LEED method. The results indicate that the surface is terminated by a monolayer of silicon with the topmost silicon atoms forming asymmetric, buckled dimers. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP POWERS, JM (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Van Hove, Michel/A-9862-2008 OI Van Hove, Michel/0000-0002-8898-6921 NR 12 TC 69 Z9 69 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 JAN PY 1992 VL 260 IS 1-3 BP L7 EP L10 DI 10.1016/0039-6028(92)90007-S PG 4 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HB017 UT WOS:A1992HB01700002 ER PT B AU PEDEN, CHF AF PEDEN, CHF BE DWYER, DJ HOFFMANN, FM TI CARBON-MONOXIDE OXIDATION ON MODEL SINGLE-CRYSTAL CATALYSTS SO SURFACE SCIENCE OF CATALYSIS: IN SITU PROBES AND REACTION KINETICS SE ACS SYMPOSIUM SERIES LA English DT Review CT SYMP AT THE 201ST NATIONAL MEETING OF THE AMERICAN CHEMICAL SOC - SURFACE SCIENCE OF CATALYSIS : IN SITU PROBES AND REACTION KINETICS CY APR 14-19, 1991 CL ATLANTA, GA SP AMER CHEM SOC ID LOW-TEMPERATURE DEACTIVATION; CO OXIDATION; SURFACE SCIENCE; KINETICS; PLATINUM; PALLADIUM; PRESSURE; RH(111); METALS; NO RP PEDEN, CHF (reprint author), SANDIA NATL LABS,DIV INORGAN MAT CHEM,ALBUQUERQUE,NM 87185, USA. NR 0 TC 8 Z9 8 U1 0 U2 12 PU AMER CHEMICAL SOC PI WASHINGTON PA WASHINGTON BN 0-8412-2189-8 J9 ACS SYM SER PY 1992 VL 482 BP 143 EP 159 PG 17 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA BV16M UT WOS:A1992BV16M00009 ER PT J AU LAFEMINA, JP AF LAFEMINA, JP TI TOTAL-ENERGY CALCULATIONS OF SEMICONDUCTOR SURFACE RECONSTRUCTIONS SO SURFACE SCIENCE REPORTS LA English DT Review ID SCANNING-TUNNELING MICROSCOPY; III-V-SEMICONDUCTORS; ELECTRON-DIFFRACTION INTENSITIES; X-RAY-DIFFRACTION; ANGLE-RESOLVED PHOTOEMISSION; BONDED CHAIN MODEL; CONSISTENT PSEUDOPOTENTIAL CALCULATIONS; ABINITIO MOLECULAR-DYNAMICS; HARTREE-FOCK CALCULATIONS; ION-BEAM CRYSTALLOGRAPHY AB In this article, the current understanding of semiconductor surface reconstructions and the role of total-energy calculations in achieving this understanding is reviewed. The methods used to compute semiconductor surface reconstructions are also surveyed. Central unifying themes such as the role of topology and surface stress in determining surface reconstructions, and the existence of universal reconstructions for the zincblende- and wurtzite-structure compound semiconductor cleavage surfaces are identified and discussed. RP PACIFIC NW LAB, MOLEC SCI RES CTR, POB 999, RICHLAND, WA 99352 USA. NR 606 TC 159 Z9 159 U1 2 U2 15 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-5729 EI 1879-274X J9 SURF SCI REP JI Surf. Sci. Rep. PY 1992 VL 16 IS 4-5 BP 133 EP 260 PG 128 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JP388 UT WOS:A1992JP38800001 ER PT J AU CHAMBERS, SA AF CHAMBERS, SA TI ELASTIC-SCATTERING AND INTERFERENCE OF BACKSCATTERED PRIMARY, AUGER AND X-RAY PHOTOELECTRONS AT HIGH KINETIC-ENERGY - PRINCIPLES AND APPLICATIONS SO SURFACE SCIENCE REPORTS LA English DT Review ID SCANNING TUNNELING MICROSCOPY; ABSORPTION FINE-STRUCTURE; SURFACE ATOMIC-STRUCTURE; HIGH-ANGULAR-RESOLUTION; ELECTRON-DIFFRACTION; MULTIPLE-SCATTERING; EPITAXIAL OVERLAYERS; GAAS(001) SURFACES; PARTIAL DENSITIES; PHASE-TRANSITION AB Similarities in the diffraction of electrons generated from Point sources in single-crystal materials are discussed and related to the underlying physics associated with the various emission processes. It is shown that despite considerable differences in origin, Auger electrons, X-ray photoelectrons, and primary electrons that are incoherently backscattered exhibit essentially the same diffraction modulations when emitted from the same material at comparable, high kinetic energies. This result occurs because the high degree of forward peaking associated with electron-atom scattering at large kinetic energies selects only lower-order interference fringes at small scattering angles which are rather insensitive to the emission mechanism or the angular momentum of the prescattered final state. Despite these similarities, Auger and X-ray photoelectrons retain the important and distinctive property of atom specificity, a property not generally possessed by backscattered primary electrons. This property can considerably simplify structure determinations of multi-element material surfaces. Although not generally atom-specific, incoherent backscattered electron diffraction offers the advantage of very rapid data acquisition when compared to Auger and X-ray photoelectron diffraction. Similarities between the three techniques are brought together under the unifying theme of secondary electron holography. In this approach, the investigator can view a secondary electron diffraction pattern as a hologram of the surface, and can, with proper care, directly extract atomic positions in the near-surface region by appropriately Fourier transforming the hologram. Recent case studies of both conventional secondary electron diffraction and holography are discussed, and comparisons between the two approaches are made. RP CHAMBERS, SA (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, M-S K2-12,POB 999, RICHLAND, WA 99352 USA. NR 138 TC 188 Z9 188 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-5729 J9 SURF SCI REP JI Surf. Sci. Rep. PY 1992 VL 16 IS 6 BP 261 EP 331 DI 10.1016/0167-5729(92)90016-5 PG 71 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JR644 UT WOS:A1992JR64400001 ER PT J AU BIEGON, A FIELDUST, S AF BIEGON, A FIELDUST, S TI REDUCED TYROSINE-HYDROXYLASE IMMUNOREACTIVITY IN LOCUS-CERULEUS OF SUICIDE VICTIMS SO SYNAPSE LA English DT Note DE NOREPINEPHRINE (NORADRENALINE); HUMAN BRAIN; IMMUNOHISTOCHEMISTRY ID HUMAN-BRAIN POSTMORTEM; CATECHOLAMINE NEURONS; ALZHEIMERS-DISEASE; DEPRESSION; RAT; INCREASES; BINDING AB Antibodies against tyrosine hydroxylase (TH, the rate-limiting enzyme in norepinephrine synthesis) and dopamine beta-hydroxylase (DBH, the last enzyme in the synthesis) were used for immunohistochemical staining of human brain locus coeruleus sections, obtained postmortem from suicide victims and matched controls. Stain density over individual cells was quantified by a computerized, video-camera-based image analysis system. Mean stain density for TH was significantly lower (by about 30%) in the locus coeruleus of suicide victims. There was no difference between suicides and controls in DBH immunoreactivity or in the number of TH immunoreactive cells. Reduced TH availability, either genetically or environmentally determined, may contribute to the noradrenergic insufficiency postulated to occur in depression and the increased beta-adrenergic receptor concentrations observed in prefrontal cortex of suicide victims. C1 WEIZMANN INST SCI,IL-76100 REHOVOT,ISRAEL. RP BIEGON, A (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,MAIL STOP 55-121,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 19 TC 42 Z9 44 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-4476 J9 SYNAPSE JI Synapse PD JAN PY 1992 VL 10 IS 1 BP 79 EP 82 DI 10.1002/syn.890100111 PG 4 WC Neurosciences SC Neurosciences & Neurology GA GZ607 UT WOS:A1992GZ60700010 PM 1346945 ER PT J AU CORMIER, RA CONNOLLY, JS PELTER, LS AF CORMIER, RA CONNOLLY, JS PELTER, LS TI A DIENE SYNTHESIS OF QUINONE ALDEHYDES SO SYNTHETIC COMMUNICATIONS LA English DT Article ID BIOREDUCTIVE ALKYLATING-AGENTS; TETRAPHENYLPORPHYRINS; DERIVATIVES; OXIDATION AB Cycloaddition of 2-(hydroxymethyl)-l,3-butadiene with representative quinones occurs readily in refluxing toluene. Oxidative dehydrogenation of the resulting cycloadduct with activated manganese dioxide in refluxing benzene affords quinone aldehydes in good to excellent overall yield. C1 METROPOLITAN STATE COLL,DEPT CHEM,DENVER,CO 80204. RP CORMIER, RA (reprint author), NATL RENEWABLE ENERGY LAB,PHOTOCONVERS RES BRANCH,GOLDEN,CO 80401, USA. NR 25 TC 7 Z9 7 U1 0 U2 2 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0039-7911 J9 SYNTHETIC COMMUN JI Synth. Commun. PY 1992 VL 22 IS 15 BP 2155 EP 2164 DI 10.1080/00397919208019067 PG 10 WC Chemistry, Organic SC Chemistry GA JL900 UT WOS:A1992JL90000003 ER PT J AU SEO, BI SUH, IH JENSEN, WP LEWIS, DE WALL, LK JACOBSON, RA AF SEO, BI SUH, IH JENSEN, WP LEWIS, DE WALL, LK JACOBSON, RA TI THE CONFORMATION OF 3-ENDO-ARYLMETHYLISOBORNYL ESTERS SO TETRAHEDRON-ASYMMETRY LA English DT Article AB The conformation of the benzyl group in 3-endo-benzylisobornyl esters depends on the nature of the ester group, and changes into a position close to coplanar with the ester group as the carbonyl group of the ester becomes conjugated. The potential use of these alcohols as chiral auxiliaries in asymmetric synthesis is addressed. C1 S DAKOTA STATE UNIV,DEPT CHEM,BOX 2202,BROOKINGS,SD 57007. BAYLOR UNIV,DEPT CHEM,WACO,TX 76798. US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 15 TC 6 Z9 6 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0957-4166 J9 TETRAHEDRON-ASYMMETR JI Tetrahedron: Asymmetry PY 1992 VL 3 IS 3 BP 367 EP 370 DI 10.1016/S0957-4166(00)80277-3 PG 4 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic; Chemistry, Physical SC Chemistry GA HL187 UT WOS:A1992HL18700012 ER PT B AU MONDY, LA INGBER, MS AF MONDY, LA INGBER, MS BE Moldenaers, P Keunings, R TI DIRECT 2ND KIND BOUNDARY INTEGRAL FORMULATION FOR STOKES-FLOW PROBLEMS SO THEORETICAL AND APPLIED RHEOLOGY, VOLS 1 AND 2 LA English DT Proceedings Paper CT 11TH INTERNATIONAL CONGRESS ON RHEOLOGY CY AUG 17-21, 1992 CL BRUSSELS, BELGIUM SP INT COMM RHEOL, COMMISS EUROPEAN COMMUNITIES, BELGIAN NATL SCI FDN, AGFA GEVAERT, BASF, CARRI MED, DOW BENELUX, ELSEVIER SCI PUBL, POLYFLOW, RHEOMETRICS C1 SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS BN 0-444-89007-6 PY 1992 BP 201 EP 203 PG 3 WC Engineering, Chemical; Mechanics; Polymer Science SC Engineering; Mechanics; Polymer Science GA BX29S UT WOS:A1992BX29S00066 ER PT B AU PAPATHANASIOU, TD INGBER, MS MONDY, LA GRAHAM, AL AF PAPATHANASIOU, TD INGBER, MS MONDY, LA GRAHAM, AL BE Moldenaers, P Keunings, R TI BOUNDARY ELEMENT MODELING OF 3-DIMENSIONAL MULTIPARTICLE COMPOSITES SO THEORETICAL AND APPLIED RHEOLOGY, VOLS 1 AND 2 LA English DT Proceedings Paper CT 11TH INTERNATIONAL CONGRESS ON RHEOLOGY CY AUG 17-21, 1992 CL BRUSSELS, BELGIUM SP INT COMM RHEOL, COMMISS EUROPEAN COMMUNITIES, BELGIAN NATL SCI FDN, AGFA GEVAERT, BASF, CARRI MED, DOW BENELUX, ELSEVIER SCI PUBL, POLYFLOW, RHEOMETRICS C1 LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS BN 0-444-89007-6 PY 1992 BP 307 EP 307 PG 1 WC Engineering, Chemical; Mechanics; Polymer Science SC Engineering; Mechanics; Polymer Science GA BX29S UT WOS:A1992BX29S00119 ER PT B AU PAPATHANASIOU, TD AF PAPATHANASIOU, TD BE Moldenaers, P Keunings, R TI A MODEL FOR THE FILLING OF COLD CAVITIES WITH SOLIDIFYING SEMICRYSTALLINE POLYMERS SO THEORETICAL AND APPLIED RHEOLOGY, VOLS 1 AND 2 LA English DT Proceedings Paper CT 11TH INTERNATIONAL CONGRESS ON RHEOLOGY CY AUG 17-21, 1992 CL BRUSSELS, BELGIUM SP INT COMM RHEOL, COMMISS EUROPEAN COMMUNITIES, BELGIAN NATL SCI FDN, AGFA GEVAERT, BASF, CARRI MED, DOW BENELUX, ELSEVIER SCI PUBL, POLYFLOW, RHEOMETRICS C1 LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS BN 0-444-89007-6 PY 1992 BP 388 EP 390 PG 3 WC Engineering, Chemical; Mechanics; Polymer Science SC Engineering; Mechanics; Polymer Science GA BX29S UT WOS:A1992BX29S00149 ER PT B AU KRAYNIK, AM REINELT, DA AF KRAYNIK, AM REINELT, DA BE Moldenaers, P Keunings, R TI SIMPLE SHEARING FLOW OF A 3D FOAM SO THEORETICAL AND APPLIED RHEOLOGY, VOLS 1 AND 2 LA English DT Proceedings Paper CT 11TH INTERNATIONAL CONGRESS ON RHEOLOGY CY AUG 17-21, 1992 CL BRUSSELS, BELGIUM SP INT COMM RHEOL, COMMISS EUROPEAN COMMUNITIES, BELGIAN NATL SCI FDN, AGFA GEVAERT, BASF, CARRI MED, DOW BENELUX, ELSEVIER SCI PUBL, POLYFLOW, RHEOMETRICS C1 SANDIA NATL LABS, DEPT 1512, ALBUQUERQUE, NM 87185 USA. NR 0 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS BN 0-444-89007-6 PY 1992 BP 675 EP 677 PG 3 WC Engineering, Chemical; Mechanics; Polymer Science SC Engineering; Mechanics; Polymer Science GA BX29S UT WOS:A1992BX29S00291 ER PT B AU GUELL, DC MONDY, LA GRAHAM, AL AF GUELL, DC MONDY, LA GRAHAM, AL BE Moldenaers, P Keunings, R TI ALIGNED, SHORT-FIBER-REINFORCED COMPOSITE-MATERIALS SO THEORETICAL AND APPLIED RHEOLOGY, VOLS 1 AND 2 LA English DT Proceedings Paper CT 11TH INTERNATIONAL CONGRESS ON RHEOLOGY CY AUG 17-21, 1992 CL BRUSSELS, BELGIUM SP INT COMM RHEOL, COMMISS EUROPEAN COMMUNITIES, BELGIAN NATL SCI FDN, AGFA GEVAERT, BASF, CARRI MED, DOW BENELUX, ELSEVIER SCI PUBL, POLYFLOW, RHEOMETRICS C1 LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS BN 0-444-89007-6 PY 1992 BP 878 EP 878 PG 1 WC Engineering, Chemical; Mechanics; Polymer Science SC Engineering; Mechanics; Polymer Science GA BX29S UT WOS:A1992BX29S00387 ER PT B AU SINNIS, G AF SINNIS, G BE Fleury, P Vacanti, G TI MILAGRO - A LOW ENERGY THRESHOLD EXTENSIVE AIR SHOWER ARRAY SO TOWARDS A MAJOR ATMOSPHERIC CERENKOV DETECTOR FOR TEV ASTRO/PARTICLE PHYSICS LA English DT Proceedings Paper CT 1st Palaiseau Workshop - Towards a Major Atmospheric Cerenkov Detector for TeV Astro/particle Physics CY JUN 11-12, 1992 CL PALAISEAU, FRANCE C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 0 PU EDITIONS FRONTIERES PI DREUX PA 7 AVENUE KENNEDY, 28100 DREUX, FRANCE BN 2-86332-126-9 PY 1992 BP 305 EP 316 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BB74V UT WOS:A1992BB74V00026 ER PT J AU RENNE, RA GIDEON, KM MILLER, RA MELLICK, PW GRUMBEIN, SL AF RENNE, RA GIDEON, KM MILLER, RA MELLICK, PW GRUMBEIN, SL TI HISTOLOGIC METHODS AND INTERSPECIES VARIATIONS IN THE LARYNGEAL HISTOLOGY OF F344/N RATS AND B6C3F1 MICE SO TOXICOLOGIC PATHOLOGY LA English DT Article DE RESPIRATORY TRACT; RODENT; INHALATION TOXICOLOGY; ANATOMY AB The relatively high incidence and variety of lesions induced in the upper respiratory tract of rodents by inhalation of xenobiotics has resulted in considerable attention given to the microscopic anatomy of this area. Specific areas of the rodent laryngeal mucosa appear to be more sensitive to inhaled materials and more likely to contain cellular changes in response to injury. These include the epithelium covering the base of the epiglottis, ventral pouch, and the medial surfaces of the vocal processes of the arytenoid cartilages. There are few good landmarks for trimming rodent larynges to get consistent and accurate sections through these target areas. We have obtained consistently reproducible results by cutting transversely through the easily palpable cricothyroid notch and embedding the entire larynx anterior to this in paraffin with the cut surface against the face of the block. Multiple sections are cut from the caudal larynx toward the epiglottis, unstained sections examined microscopically for orientation, and sections from target areas selected for staining and histopathologic examination. Routine use of these methods for preparation and microscopic examination of sections of the larynx has revealed some variations in normal laryngeal anatomy between Fischer 344 (F344/N) rats and B6C3F1 mice. RP RENNE, RA (reprint author), PACIFIC NW LAB, DEPT TOXICOL, K4-10, POB 999, RICHLAND, WA 99352 USA. NR 0 TC 20 Z9 20 U1 0 U2 0 PU SOC TOXICOLOGIC PATHOLOGISTS PI LAWRENCE PA 1041 NEW HAMPSHIRE ST PO BOX 368, LAWRENCE, KS 66044 SN 0192-6233 J9 TOXICOL PATHOL JI Toxicol. Pathol. PY 1992 VL 20 IS 1 BP 44 EP 51 PG 8 WC Pathology; Toxicology SC Pathology; Toxicology GA JB475 UT WOS:A1992JB47500006 PM 1411130 ER PT J AU RENNE, RA BROWN, HR JOKINEN, MP AF RENNE, RA BROWN, HR JOKINEN, MP TI MORPHOLOGY OF NASAL LESIONS INDUCED IN OSBORNE-MENDEL RATS AND B6C3F1 MICE BY CHRONIC INHALATION OF ALLYL GLYCIDYL ETHER SO TOXICOLOGIC PATHOLOGY LA English DT Article DE METAPLASIA; HYPERPLASIA; NEOPLASIA; DEGENERATION; REGENERATION; NASAL TOXICITY; EPOXIDE AB Chronic (24-month) inhalation exposure to 5 or 10 ppm allyl glycidyl ether (AGE) induced nasal lesions in Osborne-Mendel rats and B6C3F1 mice. Inflammation, degeneration, regeneration, metaplasia, hyperplasia, and neoplasia were observed in the nasal mucosa. Squamous metaplasia and hyperplasia of the respiratory epithelium and degeneration and regeneration with subsequent squamous and/or respiratory metaplasia of the olfactory epithelium were observed in many AGE-exposed animals. Three primary nasal neoplasms (1 papillary adenoma, 1 squamous cell carcinoma. and 1 olfactory epithelial carcinoma) were observed in rats exposed to 10 ppm AGE, and 1 nasal papillar-v adenoma was observed in a rat exposed to 5 ppm. Four papillary adenomas and 2 hemangiomas were observed in the noses of mice exposed to 10 ppm AGE. Although the incidence of primary nasal tumors in AGE-exposed rats or mice was not statistically significant compared to the incidence in concurrent controls, the relative rarity of primary nasal tumors in historical controls and the concurrent presence of metaplastic and hyperplastic nasal lesions similar to those reported to be associated with induced tumors of nasal epithelia by other chemicals suggest that the nasal tumors observed may be related to AGE exposure. It was concluded that, in addition to lesions indicating a toxic effect on the nasal mucosa, inhalation exposure to AGE for 24 months resulted in some evidence of carcinogenicity of AGE for male mice, equivocal evidence of carcinogenicity for female mice and male rats. and no evidence of carcinogenicity for female rats. RP RENNE, RA (reprint author), PACIFIC NW LAB, DEPT TOXICOL, K4-10, POB 999, RICHLAND, WA 99352 USA. FU NIEHS NIH HHS [N01-ES-38061] NR 0 TC 2 Z9 2 U1 0 U2 0 PU SOC TOXICOLOGIC PATHOLOGISTS PI LAWRENCE PA 1041 NEW HAMPSHIRE ST PO BOX 368, LAWRENCE, KS 66044 SN 0192-6233 J9 TOXICOL PATHOL JI Toxicol. Pathol. PY 1992 VL 20 IS 3 BP 416 EP 425 PN 1 PG 10 WC Pathology; Toxicology SC Pathology; Toxicology GA KM691 UT WOS:A1992KM69100011 PM 1295070 ER PT J AU TRAVIS, CC BELEFANT, H AF TRAVIS, CC BELEFANT, H TI PROMOTION AS A FACTOR IN CARCINOGENESIS SO TOXICOLOGY LETTERS LA English DT Article DE PROMOTION; NONGENOTOXIC; THRESHOLD ID PUTATIVE PRENEOPLASTIC CELLS; LIVER CARCINOGENESIS; TUMOR PROMOTERS; CHEMICAL CARCINOGENESIS; RETINOBLASTOMA GENE; BREAST-CANCER; HEPATIC FOCI; RATS; HEPATOCARCINOGENESIS; SKIN AB Promotion is any factor which results in the increased cellular replication of initiated or transformed cells. We argue that cytotoxicity is not a necessary component of promotion and that. therefore, the existence of a threshold for promotion is unlikely. RP TRAVIS, CC (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,RISK ANAL SECT,POB 2008,MS-6109,4500S,OAK RIDGE,TN 37831, USA. NR 57 TC 12 Z9 12 U1 0 U2 0 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0378-4274 J9 TOXICOL LETT JI Toxicol. Lett. PD JAN PY 1992 VL 60 IS 1 BP 1 EP 9 DI 10.1016/0378-4274(92)90041-H PG 9 WC Toxicology SC Toxicology GA HC093 UT WOS:A1992HC09300001 PM 1539176 ER PT J AU BRAUN, T KLEIN, A ZSINDELY, S LYON, WS AF BRAUN, T KLEIN, A ZSINDELY, S LYON, WS TI IMMUNOASSAYS - FROM RIA TO VIA SO TRAC-TRENDS IN ANALYTICAL CHEMISTRY LA English DT Article ID LINKED IMMUNOSORBENT ASSAY; QUANTITATIVE ASSAY; IMMUNOGLOBULIN-G; ENZYME; ANTIGEN C1 LIB HUNGARIAN ACAD SCI,INFORMAT SCI & SCIENTOMETR RES UNIT,BUDAPEST,HUNGARY. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP BRAUN, T (reprint author), L EOTVOS UNIV,INST INORGAN & ANALYT CHEM,POB 123,H-1443 BUDAPEST,HUNGARY. NR 26 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-9936 J9 TRAC-TREND ANAL CHEM JI Trac-Trends Anal. Chem. PD JAN PY 1992 VL 11 IS 1 BP 5 EP 7 DI 10.1016/0165-9936(92)80112-J PG 3 WC Chemistry, Analytical SC Chemistry GA HD435 UT WOS:A1992HD43500004 ER PT J AU DRZYMALA, J CHMIELEWSKI, T WOLTERS, KL BIRLINGMAIR, DH WHEELOCK, TD AF DRZYMALA, J CHMIELEWSKI, T WOLTERS, KL BIRLINGMAIR, DH WHEELOCK, TD TI MICROFLOTATION MEASUREMENT BASED ON MODIFIED HALLIMOND TUBE SO TRANSACTIONS OF THE INSTITUTION OF MINING AND METALLURGY SECTION C-MINERAL PROCESSING AND EXTRACTIVE METALLURGY LA English DT Article ID FLOTATION AB Microflotation tests were conducted with a modifed Hallimond tube equipped with a fritted glass disk and magnetic stirrer to determine whether the results would support an equation that predicts a linear relationship between particle size and the reciprocal of particle density in water for a specified flotation recovery in a given time. The equation had been established previously from data obtained with a mono-bubble Hallimond tube equipped with a single capillary for introducing gas. In the latest tests hydrophilic silica and hematite particles were used to establish a baseline representing recovery by mechanical carryover alone, and hydrophobic particles of either elemental sulphur, sulphur-coated quartz, sulphurized pyrite or molybdenite were used to demonstrate flotation involving particle-bubble attachment. Since the equation was in good agreement with the results, its use for analysing data obtained with the modified Hallimond tube appears to be justified. It was also shown that the natural floatability of molybdenite is somewhat less than that of elemental sulphur and that sodium dithionite is a good depressant for sulphurized pyrite. In addition, it was found that the untreated pyrite and galena used in the study were hydrophilic and did not float by particle-bubble attachment. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM ENGN,AMES,IA 50011. WROCLAW TECH UNIV,RES,PL-50370 WROCLAW,POLAND. RP DRZYMALA, J (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 27 TC 1 Z9 1 U1 0 U2 1 PU INST MINING METALLURGY PI LONDON PA 44 PORTLAND PLACE, LONDON, ENGLAND W1N 4BR SN 0371-9553 J9 T I MIN METALL C JI Trans. Inst. Min. Metall. Sect. C-Miner. Process. Extr. Metall. PD JAN-APR PY 1992 VL 101 BP C17 EP C24 PG 8 WC Mining & Mineral Processing SC Mining & Mineral Processing GA JA863 UT WOS:A1992JA86300003 ER PT J AU BLENCOE, JG AF BLENCOE, JG TI A 2-PARAMETER MARGULES METHOD FOR MODELING THE THERMODYNAMIC MIXING PROPERTIES OF ALBITE-WATER MELTS SO TRANSACTIONS OF THE ROYAL SOCIETY OF EDINBURGH-EARTH SCIENCES LA English DT Article; Proceedings Paper CT 2ND HUTTON SYMP ON THE ORIGIN OF GRANITES AND RELATED ROCKS CY SEP 23-28, 1991 CL AUSTR ACAD SCI, CANBERRA, AUSTRALIA SP NEWMONT AUSTR, NORMANDY POSEIDEN, PETRO SERV, SHELL AUSTR, ANSETT AUSTR, AUSTR TOURIST COMMISS, BUR MINERAL RESOURCES AUSTR, PLUTON RESOURCES HO AUSTR ACAD SCI DE IGNEOUS PETROLOGY; GRANITE; MAGMAS; SILICATE MELTS; THERMODYNAMICS; ALBITE; WATER AB A two-parameter Margules method has been developed for modelling the thermodynamic mixing properties and hypersolidus phase relations of albite-water (ab-w) melts. The method is based largely on phase-equilibrium and calorimetric data that are either currently available or readily obtainable; P-V-T data are not required. The new modelling method has been applied to calculate: (1) thermodynamic mixing properties for ab-w melts at 2.5 kbar, 815-degrees-C; and (2) hypersolidus phase relations for the ab-w system at 2.5 kbar. Results are uniformly positive-activity-composition relations are similar to those predicted by equations based on P-V-T data, excess enthalpies are in good agreement with data obtained from calorimetry, and calculated phase relations are fully compatible with phase-equilibrium data for ab-w melts acquired at 2.5 kbar. It is concluded that the Margules method for thermodynamic modelling of ab-w melts is a practical alternative to the P-V-T modelling method. RP BLENCOE, JG (reprint author), OAK RIDGE NATL LAB,DIV CHEM,GEOSCI GRP,OAK RIDGE,TN 37831, USA. NR 0 TC 10 Z9 10 U1 0 U2 0 PU ROYAL SOC EDINBURGH PI EDINBURGH PA 22-24 GEORGE ST, EDINBURGH, MIDLOTHIAN, SCOTLAND EH2 2PQ SN 0263-5933 J9 T ROY SOC EDIN-EARTH JI Trans. R. Soc. Edinb.-Earth Sci. PY 1992 VL 83 BP 423 EP 428 PN 1-2 PG 6 WC Geosciences, Multidisciplinary; Paleontology SC Geology; Paleontology GA JL995 UT WOS:A1992JL99500039 ER PT J AU WULLSCHLEGER, SD NORBY, RJ HENDRIX, DL AF WULLSCHLEGER, SD NORBY, RJ HENDRIX, DL TI CARBON EXCHANGE-RATES, CHLOROPHYLL CONTENT, AND CARBOHYDRATE STATUS OF 2 FOREST TREE SPECIES EXPOSED TO CARBON-DIOXIDE ENRICHMENT SO TREE PHYSIOLOGY LA English DT Article AB Seedlings of yellow-poplar (Liriodendron tulipifera L.) and white oak (Quercus alba L.) were exposed continuously to one of three CO2 concentrations in open-top chambers under field conditions and evaluated after 24 weeks with respect to carbon exchange rates (CER), chlorophyll (Chl) content, and diurnal carbohydrate status. Increasing the CO2 concentration from ambient to +150 or +300-mu-l l-1 stimulated CER of yellow-poplar and white oak seedlings by 60 and over 35%, respectively, compared to ambient-grown seedlings. The increases in CER were not associated with a significant change in stomatal conductance and occurred despite a reduction in the amounts of Chl and accessory pigments in the leaves of plants grown in CO2-enriched air. Total Chl contents of yellow-poplar and white oak seedlings grown at +300-mu-l l-1 were reduced by 27 and over 55%, respectively, compared with ambient-grown seedlings. Yellow-poplar and white oak seedlings grown at +300-mu-l l-1 contained 72 and 67% more morning starch, respectively, than did ambient-grown plants. In contrast, yellow-poplar and white oak seedlings grown at +300-mu-l l-1 contained 17 and 27% less evening sucrose, respectively, than did plants grown at ambient CO2 concentration. Diurnal starch accumulation and the subsequent depletion of sucrose contributed to a pronounced increase in the starch/sucrose ratio of plants grown in CO2-enriched air. All seedlings exhibited a substantial reduction in dark respiration as CO2 concentration increased, but the significance of this increase to the carbohydrate status and carbon economy of plants grown in CO2-enriched air remains unclear. RP WULLSCHLEGER, SD (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI Wullschleger, Stan/B-8297-2012; Norby, Richard/C-1773-2012 OI Wullschleger, Stan/0000-0002-9869-0446; Norby, Richard/0000-0002-0238-9828 NR 0 TC 114 Z9 119 U1 0 U2 14 PU HERON PUBLISHING PI VICTORIA PA BOX 5579 STATION B, VICTORIA BC V8R 6S4, CANADA SN 0829-318X J9 TREE PHYSIOL JI Tree Physiol. PD JAN PY 1992 VL 10 IS 1 BP 21 EP 31 PG 11 WC Forestry SC Forestry GA HB686 UT WOS:A1992HB68600002 ER PT J AU CANTOR, CR AF CANTOR, CR TI BUDGETING THE GENOME SO TRENDS IN BIOTECHNOLOGY LA English DT Article C1 UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. RP CANTOR, CR (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,DOE HUMAN GENOME PROJECT,BERKELEY,CA 94720, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0167-7799 J9 TRENDS BIOTECHNOL JI Trends Biotechnol. PD JAN-FEB PY 1992 VL 10 IS 1-2 BP 6 EP 8 DI 10.1016/0167-7799(92)90157-Q PG 3 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA HF530 UT WOS:A1992HF53000002 PM 1367937 ER PT J AU HARDING, JD KELLER, RA AF HARDING, JD KELLER, RA TI SINGLE-MOLECULE DETECTION AS AN APPROACH TO RAPID DNA SEQUENCING SO TRENDS IN BIOTECHNOLOGY LA English DT Article ID ELECTROPHORESIS; PROBES AB Current sequencing technologies are insufficient to cope with large-scale projects such as sequencing the human genome and genomes of model organisms. In addition, as genetic lesions associated with specific human diseases are identified, DNA sequencing will be used increasingly for clinical applications. Thus, new approaches are needed to combine high-throughput with accuracy for both research and diagnostic purposes. A novel technology based on detection of individual fluorescent nucleotides in a flowing sample stream is under development. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR HUMAN GENOME STUDIES,LOS ALAMOS,NM 87545. RP HARDING, JD (reprint author), LIFE TECHNOL INC,GIBCO BRL,DIV CORP RES,8717 GROVEMONT CIRCLE,GAITHERSBURG,MD 20898, USA. NR 17 TC 25 Z9 26 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0167-7799 J9 TRENDS BIOTECHNOL JI Trends Biotechnol. PD JAN-FEB PY 1992 VL 10 IS 1-2 BP 55 EP 57 DI 10.1016/0167-7799(92)90170-Z PG 3 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA HF530 UT WOS:A1992HF53000015 PM 1367935 ER PT J AU MURAL, RJ EINSTEIN, JR GUAN, XJ MANN, RC UBERBACHER, EC AF MURAL, RJ EINSTEIN, JR GUAN, XJ MANN, RC UBERBACHER, EC TI AN ARTIFICIAL-INTELLIGENCE APPROACH TO DNA-SEQUENCE FEATURE RECOGNITION SO TRENDS IN BIOTECHNOLOGY LA English DT Article AB The ultimate goal of the Human Genome project is to extract the biologically relevant information recorded in the estimated 100 000 genes encoded by the 3 x 10(9) bases of the human genome. This necessitates development of reliable computer-based methods capable of analysing and correctly identifying genes in the vast amounts of DNA-sequence data generated. Such tools may save time and labour by simplifying, for example, screening of cDNA libraries. They may also facilitate the localization of human disease genes by identifying candidate genes in promising regions of anonymous DNA sequence. C1 OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,OAK RIDGE,TN 37831. RP MURAL, RJ (reprint author), OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831, USA. NR 11 TC 29 Z9 29 U1 0 U2 2 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0167-7799 J9 TRENDS BIOTECHNOL JI Trends Biotechnol. PD JAN-FEB PY 1992 VL 10 IS 1-2 BP 66 EP 69 DI 10.1016/0167-7799(92)90173-S PG 4 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA HF530 UT WOS:A1992HF53000018 PM 1367939 ER PT J AU CASEY, D MANSFIELD, BK AF CASEY, D MANSFIELD, BK TI NONPROFIT BIOLOGICAL RESOURCE CENTERS SO TRENDS IN BIOTECHNOLOGY LA English DT Article RP CASEY, D (reprint author), OAK RIDGE NATL LAB,HUMAN GENOME MANAGEMENT INFORMAT SYST,POB 2008,OAK RIDGE,TN 37831, USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0167-7799 J9 TRENDS BIOTECHNOL JI Trends Biotechnol. PD JAN-FEB PY 1992 VL 10 IS 1-2 BP 70 EP 73 DI 10.1016/0167-7799(92)90174-T PG 4 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA HF530 UT WOS:A1992HF53000019 PM 1367940 ER PT J AU MCGAFFEY, R AF MCGAFFEY, R BE Beeton, B Burbank, M TI AUTOMATIC TABLES USING SGML, C, AND TEX SO TUGBOAT, VOL 12, NO 3, OCTOBER 1992 LA English DT Proceedings Paper CT TEX Users Group 13th Annual Meeting CY JUL 27-30, 1992 CL PORTLAND, OR SP AMER MATH SOC, TEX USERS GRP C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU TEX USERS GROUP PI SANTA BARBARA PA BALBOA BLDG, ROOM 307 735 STATE ST, SANTA BARBARA, CA 93101 PY 1992 BP 291 EP 294 PG 4 WC Computer Science, Software Engineering SC Computer Science GA BA08V UT WOS:A1992BA08V00006 ER PT B AU SCHOENLEIN, RW SHANK, CV PETEANU, LA MATHIES, RA AF SCHOENLEIN, RW SHANK, CV PETEANU, LA MATHIES, RA BE LAUBEREAU, A SEILMEIER, A TI FEMTOSECOND PHOTOISOMERIZATION OF RHODOPSIN AS THE PRIMARY EVENT IN VISION SO ULTRAFAST PROCESSES IN SPECTROSCOPY 1991: EMIL WARBURG - SYMPOSIUM ; EPS - MEETING SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 7TH INTERNATIONAL SYMP ON ULTRAFAST PROCESSES IN SPECTROSCOPY CY OCT 07-10, 1991 CL BAYREUTH, GERMANY SP EMIL WARBURG STIFT, DEUT FORSCHUNGSGEMEINSCH, DEUT AKAD AUSTAUSCHDIENST, W E HERAEUS STIFT RP SCHOENLEIN, RW (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Schoenlein, Robert/D-1301-2014 OI Schoenlein, Robert/0000-0002-6066-7566 NR 0 TC 0 Z9 0 U1 2 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL BN 0-7503-0198-8 J9 INST PHYS CONF SER PY 1992 VL 126 BP 583 EP 588 PG 6 WC Spectroscopy SC Spectroscopy GA BW54B UT WOS:A1992BW54B00131 ER PT J AU MAYNARD, JD MCKENNA, MJ MIGLIORI, A VISSCHER, WM AF MAYNARD, JD MCKENNA, MJ MIGLIORI, A VISSCHER, WM TI ULTRASONIC MEASUREMENTS OF ELASTIC-CONSTANTS IN SINGLE-CRYSTALS OF LA2CUO4 SO ULTRASONICS OF HIGH-T(C) AND OTHER UNCONVENTIONAL SUPERCONDUCTORS SE PHYSICAL ACOUSTICS LA English DT Review ID STRUCTURAL PHASE-TRANSITION; SUPERCONDUCTIVITY; INSTABILITY C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM. RP MAYNARD, JD (reprint author), PENN STATE UNIV,DEPT PHYS,UNIV PK,PA 16802, USA. NR 38 TC 1 Z9 1 U1 1 U2 4 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0893-388X J9 PHYS ACOUSTICS PY 1992 VL 20 BP 381 EP 408 PG 28 WC Acoustics SC Acoustics GA BZ60U UT WOS:A1992BZ60U00008 ER PT J AU KRESIN, VZ AF KRESIN, VZ TI HIGH T-C SUPERCONDUCTIVITY AND ULTRASONICS-THEORETICAL ASPECTS SO ULTRASONICS OF HIGH-T(C) AND OTHER UNCONVENTIONAL SUPERCONDUCTORS SE PHYSICAL ACOUSTICS LA English DT Review ID ELECTRONIC-STRUCTURE; ORGANIC SUPERCONDUCTORS; ENERGY-GAP; O SYSTEM; LA2-XSRXCUO4; TEMPERATURE; PARAMETERS; ATTENUATION; STATE; UPT3 RP KRESIN, VZ (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720, USA. NR 78 TC 1 Z9 1 U1 0 U2 0 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0893-388X J9 PHYS ACOUSTICS PY 1992 VL 20 BP 435 EP 454 PG 20 WC Acoustics SC Acoustics GA BZ60U UT WOS:A1992BZ60U00010 ER PT S AU BRANSTETTER, ML GUSE, JA NESSETT, DM AF BRANSTETTER, ML GUSE, JA NESSETT, DM BE Neufeld, G Plattner, B TI ELROS - AN EMBEDDED LANGUAGE FOR REMOTE OPERATIONS SERVICE SO UPPER LAYER PROTOCOLS, ARCHITECTURES AND APPLICATIONS SE IFIP TRANSACTIONS C-COMMUNICATION SYSTEMS LA English DT Proceedings Paper CT IFIP TC6/WG6.5 International Conference on Upper Layer Protocols, Architectures and Applications CY MAY 27-29, 1992 CL VANCOUVER, CANADA SP IFIP DE DISTRIBUTED SYSTEMS; NETWORK PROTOCOLS; CONCURRENT PROGRAMMING C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE PUBL B V PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0926-549X BN 0-444-89766-6 J9 IFIP TRANS C PY 1992 VL 7 BP 33 EP 47 PG 15 WC Computer Science, Hardware & Architecture SC Computer Science GA BZ90R UT WOS:A1992BZ90R00003 ER PT J AU PENG, SS WANG, MC WALBERG, HJ AF PENG, SS WANG, MC WALBERG, HJ TI DEMOGRAPHIC DISPARITIES OF INNER-CITY 8TH GRADERS SO URBAN EDUCATION LA English DT Article C1 TEMPLE UNIV,CTR RES HUMAN DEV & EDUC,PHILADELPHIA,PA 19122. UNIV ILLINOIS,EDUC,CHICAGO,IL 60680. RP PENG, SS (reprint author), US DOE,NATL CTR EDUC STAT,WASHINGTON,DC, USA. NR 17 TC 9 Z9 9 U1 0 U2 1 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 0042-0859 J9 URBAN EDUC JI Urban Educ. PD JAN PY 1992 VL 26 IS 4 BP 441 EP 459 DI 10.1177/0042085992026004008 PG 19 WC Education & Educational Research; Urban Studies SC Education & Educational Research; Urban Studies GA GZ051 UT WOS:A1992GZ05100006 ER PT J AU PETERS, RW DANIELS, EJ WOLSKY, AM AF PETERS, RW DANIELS, EJ WOLSKY, AM TI RESEARCH AGENDA FOR WASTE MINIMIZATION SO WATER SCIENCE AND TECHNOLOGY LA English DT Article DE CHEMICAL INDUSTRY; WASTE MINIMIZATION; WASTE REDUCTION; RESEARCH AGENDA AB Because of the large quantities of materials and energy used by the chemical industry, significant opportunities are available for waste reduction. Waste reduction techniques include improvements in process selectivity and/or conversion, the ability to operate at lower temperatures and/or pressures, processes requiring fewer steps, feedstocks with fewer inherent byproducts, more efficient equipment design, products and/or catalysts with longer lives, more efficient unit operations, innovative process integration, avoidance of heat degradation of reaction products, new uses for otherwise valueless by-products, and elimination of leaks and fugitive emissions. The implementation of waste minimization alternatives in the chemical industry were categorized in terms of near- (0-5 years implementation), mid- (5-10 years), and long-term impacts (10+ years). RP PETERS, RW (reprint author), ARGONNE NATL LAB,DIV ENERGY SYST,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 4 TC 4 Z9 4 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1223 J9 WATER SCI TECHNOL JI Water Sci. Technol. PY 1992 VL 25 IS 3 BP 93 EP 100 PG 8 WC Engineering, Environmental; Environmental Sciences; Water Resources SC Engineering; Environmental Sciences & Ecology; Water Resources GA HX917 UT WOS:A1992HX91700011 ER PT J AU RITTER, JA BIBLER, JP AF RITTER, JA BIBLER, JP TI REMOVAL OF MERCURY FROM WASTE-WATER - LARGE-SCALE PERFORMANCE OF AN ION-EXCHANGE PROCESS SO WATER SCIENCE AND TECHNOLOGY LA English DT Article DE ION EXCHANGE; DUOLITETM GT-73; MERCURY REMOVAL; WASTE WATER AB Duolite(TM) GT-73 ion exchange resin Toutinely reduces the mercury content of a waste water stream to less than the permitted level of 10 ppb. Effluent concentrations from the ion exchange facility (IEF) are consistently between 1 to 5 ppb, even though the feed contains a varying concentration of mercury (0.2 to 70 ppm). Two operational problems have been encountered at that facility, however. Firstly, the stated capacity of the resin for mercury was not being achieved. The abnormally low capacity was traced to analytical laboratory waste which was intermittently treated by the resin. That waste contained hydrochloric acid, stannous chloride, and potassium permanganate, among other chemicals, which presumably eluted sorbed mercury from the resin and also oxidized the thiol (SH) functional groups on the resin and rendered them inactive. The net effect was that the resin had to be replaced more frequendy than anticipated. Secondly, the IEF was temporarily shut down because the mercury content of the waste water could not be reduced to below the permitted level, even with fresh resin. That problem was caused by slow settling solids composed mainly of iron which apparently adsorbed some of the mercury and allowed it to pass through the resin untreated. The solids were presumably a result of processing waste water abnormally high in iron which may have co-precipitated with mercury and other elements in the feed and caused a residual buildup of solids throughout the IEF. The problem was remedied by installing a 0.2-mu-m cartridge filter between the feed tank and the columns. RP RITTER, JA (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER LAB,AIKEN,SC 29808, USA. NR 7 TC 57 Z9 59 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1223 J9 WATER SCI TECHNOL JI Water Sci. Technol. PY 1992 VL 25 IS 3 BP 165 EP 172 PG 8 WC Engineering, Environmental; Environmental Sciences; Water Resources SC Engineering; Environmental Sciences & Ecology; Water Resources GA HX917 UT WOS:A1992HX91700019 ER PT J AU RITTER, JA ZAMECNIK, JR HUTSON, ND SMITH, ME CARTER, JT AF RITTER, JA ZAMECNIK, JR HUTSON, ND SMITH, ME CARTER, JT TI HIGH-LEVEL RADIOACTIVE-WASTE VITRIFICATION TECHNOLOGY AND ITS APPLICABILITY TO INDUSTRIAL-WASTE SLUDGES SO WATER SCIENCE AND TECHNOLOGY LA English DT Article RP RITTER, JA (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER LAB,AIKEN,SC 29808, USA. NR 7 TC 7 Z9 7 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1223 J9 WATER SCI TECHNOL JI Water Sci. Technol. PY 1992 VL 25 IS 3 BP 269 EP 271 PG 3 WC Engineering, Environmental; Environmental Sciences; Water Resources SC Engineering; Environmental Sciences & Ecology; Water Resources GA HX917 UT WOS:A1992HX91700034 ER PT S AU LAKS, DB VAN DE WALLE, CG AF LAKS, DB VAN DE WALLE, CG BE Moustakas, TD Pankove, JI Hamakawa, Y TI SELF-COMPENSATION AND DOPING PROBLEMS IN ZNSE SO WIDE BAND GAP SEMICONDUCTORS SE Materials Research Society Symposium Proceedings LA English DT Proceedings Paper CT SYMP ON WIDE BAND GAP SEMICONDUCTORS, AT THE 1991 FALL MEETING OF THE MATERIALS RESEARCH SOC CY DEC 02-06, 1991 CL BOSTON, MA SP MAT RES SOC, USAF, OFF SCI RES, USN, OFF NAVAL RES, NATL RENEWABLE ENERGY LAB, BANDGAP TECHNOL, KENNAMETAL, NIPPONDENSO, SANYO ELECT C1 NATL RENEWABLE ENERGY LAB, GOLDEN, CO 80401 USA. RI Van de Walle, Chris/A-6623-2012 OI Van de Walle, Chris/0000-0002-4212-5990 NR 0 TC 0 Z9 0 U1 0 U2 0 PU MATERIALS RESEARCH SOC PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-136-0 J9 MATER RES SOC SYMP P PY 1992 VL 242 BP 311 EP 321 DI 10.1557/PROC-242-311 PG 11 WC Materials Science, Ceramics; Physics, Condensed Matter SC Materials Science; Physics GA BW28F UT WOS:A1992BW28F00044 ER PT S AU FRIEDMANN, TA MCCARTY, KF KLAUS, EJ BOEHME, D CLIFT, WM JOHNSEN, HA MILLS, MJ OTTESEN, DK STULEN, RH AF FRIEDMANN, TA MCCARTY, KF KLAUS, EJ BOEHME, D CLIFT, WM JOHNSEN, HA MILLS, MJ OTTESEN, DK STULEN, RH BE Moustakas, TD Pankove, JI Hamakawa, Y TI PULSED EXCIMER LASER ABLATION DEPOSITION OF BORON-NITRIDE ON SI (100) SUBSTRATES SO WIDE BAND GAP SEMICONDUCTORS SE Materials Research Society Symposium Proceedings LA English DT Proceedings Paper CT SYMP ON WIDE BAND GAP SEMICONDUCTORS, AT THE 1991 FALL MEETING OF THE MATERIALS RESEARCH SOC CY DEC 02-06, 1991 CL BOSTON, MA SP MAT RES SOC, USAF, OFF SCI RES, USN, OFF NAVAL RES, NATL RENEWABLE ENERGY LAB, BANDGAP TECHNOL, KENNAMETAL, NIPPONDENSO, SANYO ELECT C1 SANDIA NATL LABS, LIVERMORE, CA 94551 USA. RI McCarty, Kevin/F-9368-2012 OI McCarty, Kevin/0000-0002-8601-079X NR 0 TC 0 Z9 0 U1 0 U2 0 PU MATERIALS RESEARCH SOC PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-136-0 J9 MATER RES SOC SYMP P PY 1992 VL 242 BP 593 EP 598 DI 10.1557/PROC-242-593 PG 6 WC Materials Science, Ceramics; Physics, Condensed Matter SC Materials Science; Physics GA BW28F UT WOS:A1992BW28F00081 ER PT S AU WARREN, WL KANICKI, J RONG, FC BUCHWALD, WR HARMATZ, M AF WARREN, WL KANICKI, J RONG, FC BUCHWALD, WR HARMATZ, M BE Moustakas, TD Pankove, JI Hamakawa, Y TI OPTICALLY INDUCED PARAMAGNETISM IN AMORPHOUS HYDROGENATED SILICON-NITRIDE THIN-FILMS SO WIDE BAND GAP SEMICONDUCTORS SE Materials Research Society Symposium Proceedings LA English DT Proceedings Paper CT SYMP ON WIDE BAND GAP SEMICONDUCTORS, AT THE 1991 FALL MEETING OF THE MATERIALS RESEARCH SOC CY DEC 02-06, 1991 CL BOSTON, MA SP MAT RES SOC, USAF, OFF SCI RES, USN, OFF NAVAL RES, NATL RENEWABLE ENERGY LAB, BANDGAP TECHNOL, KENNAMETAL, NIPPONDENSO, SANYO ELECT C1 SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. RI Kanicki, Jerzy/E-2753-2016 OI Kanicki, Jerzy/0000-0002-3649-8360 NR 0 TC 9 Z9 9 U1 0 U2 1 PU MATERIALS RESEARCH SOC PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-136-0 J9 MATER RES SOC SYMP P PY 1992 VL 242 BP 687 EP 692 DI 10.1557/PROC-242-687 PG 6 WC Materials Science, Ceramics; Physics, Condensed Matter SC Materials Science; Physics GA BW28F UT WOS:A1992BW28F00094 ER PT B AU LOOSE, R AF LOOSE, R GP AMER WIND ENERGY ASSOC TI WELCOMING REMARKS SO WINDPOWER '92 PROCEEDINGS LA English DT Proceedings Paper CT Windpower 92 Annual Conference and Exhibition CY OCT 19-23, 1992 CL SEATTLE, WA SP AMER WIND ENERGY ASSOC, US DOE, NATL RENEWABLE ENERGY LAB, NW POWER PLANNING COUNCIL, BONNEVILLE POWER ADM, PUGET SOUND POWER & LIGHT C1 US DOE,DIV WIND,WASHINGTON,DC 20585. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN WIND ENERGY ASSOCIATION PI WASHINGTON PA 122 C STREET NW 4TH FLOOR, WASHINGTON, DC 20001-2109 PY 1992 BP 2 EP 2 PG 1 WC Energy & Fuels; Engineering, Environmental SC Energy & Fuels; Engineering GA BB70D UT WOS:A1992BB70D00001 ER PT B AU KESSLER, RR AF KESSLER, RR GP AMER WIND ENERGY ASSOC TI WINDPOWER-92 SO WINDPOWER '92 PROCEEDINGS LA English DT Proceedings Paper CT Windpower 92 Annual Conference and Exhibition CY OCT 19-23, 1992 CL SEATTLE, WA SP AMER WIND ENERGY ASSOC, US DOE, NATL RENEWABLE ENERGY LAB, NW POWER PLANNING COUNCIL, BONNEVILLE POWER ADM, PUGET SOUND POWER & LIGHT C1 US DOE,RENEWABLE ENERGY CONVERS,WASHINGTON,DC 20585. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN WIND ENERGY ASSOCIATION PI WASHINGTON PA 122 C STREET NW 4TH FLOOR, WASHINGTON, DC 20001-2109 PY 1992 BP 3 EP 5 PG 3 WC Energy & Fuels; Engineering, Environmental SC Energy & Fuels; Engineering GA BB70D UT WOS:A1992BB70D00002 ER PT B AU SANMARTIN, RL AF SANMARTIN, RL GP AMER WIND ENERGY ASSOC TI THE PERIOD OF OPPORTUNITY FOR WIND AND OTHER RENEWABLE ENERGY-RESOURCES SO WINDPOWER '92 PROCEEDINGS LA English DT Proceedings Paper CT Windpower 92 Annual Conference and Exhibition CY OCT 19-23, 1992 CL SEATTLE, WA SP AMER WIND ENERGY ASSOC, US DOE, NATL RENEWABLE ENERGY LAB, NW POWER PLANNING COUNCIL, BONNEVILLE POWER ADM, PUGET SOUND POWER & LIGHT C1 US DOE,OFF CONSERVAT & RENEWABLE ENERGY,WASHINGTON,DC 20585. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN WIND ENERGY ASSOCIATION PI WASHINGTON PA 122 C STREET NW 4TH FLOOR, WASHINGTON, DC 20001-2109 PY 1992 BP 34 EP 41 PG 8 WC Energy & Fuels; Engineering, Environmental SC Energy & Fuels; Engineering GA BB70D UT WOS:A1992BB70D00009 ER PT B AU SCHWARTZ, MN ELLIOTT, DL GOWER, GL AF SCHWARTZ, MN ELLIOTT, DL GOWER, GL GP AMER WIND ENERGY ASSOC TI GRIDDED STATE MAPS OF WIND ELECTRIC-POTENTIAL SO WINDPOWER '92 PROCEEDINGS LA English DT Proceedings Paper CT Windpower 92 Annual Conference and Exhibition CY OCT 19-23, 1992 CL SEATTLE, WA SP AMER WIND ENERGY ASSOC, US DOE, NATL RENEWABLE ENERGY LAB, NW POWER PLANNING COUNCIL, BONNEVILLE POWER ADM, PUGET SOUND POWER & LIGHT C1 BATTELLE MEM INST,PACIFIC NW LABS,RICHLAND,WA 99352. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN WIND ENERGY ASSOCIATION PI WASHINGTON PA 122 C STREET NW 4TH FLOOR, WASHINGTON, DC 20001-2109 PY 1992 BP 50 EP 58 PG 9 WC Energy & Fuels; Engineering, Environmental SC Energy & Fuels; Engineering GA BB70D UT WOS:A1992BB70D00011 ER PT B AU CADOGAN, JB GEORGE, KE AF CADOGAN, JB GEORGE, KE GP AMER WIND ENERGY ASSOC TI THE RISKS OF CONVENTIONAL UTILITY SUPPLY SOURCES AND THE REWARDS OF RENEWABLE ENERGY SO WINDPOWER '92 PROCEEDINGS LA English DT Proceedings Paper CT Windpower 92 Annual Conference and Exhibition CY OCT 19-23, 1992 CL SEATTLE, WA SP AMER WIND ENERGY ASSOC, US DOE, NATL RENEWABLE ENERGY LAB, NW POWER PLANNING COUNCIL, BONNEVILLE POWER ADM, PUGET SOUND POWER & LIGHT C1 US DOE,WASHINGTON,DC 20585. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN WIND ENERGY ASSOCIATION PI WASHINGTON PA 122 C STREET NW 4TH FLOOR, WASHINGTON, DC 20001-2109 PY 1992 BP 101 EP 112 PG 12 WC Energy & Fuels; Engineering, Environmental SC Energy & Fuels; Engineering GA BB70D UT WOS:A1992BB70D00017 ER PT B AU SCHLUTER, LL VACHON, WA AF SCHLUTER, LL VACHON, WA GP AMER WIND ENERGY ASSOC TI ADVANCED CONTROL STRATEGIES FOR WIND TURBINES SO WINDPOWER '92 PROCEEDINGS LA English DT Proceedings Paper CT Windpower 92 Annual Conference and Exhibition CY OCT 19-23, 1992 CL SEATTLE, WA SP AMER WIND ENERGY ASSOC, US DOE, NATL RENEWABLE ENERGY LAB, NW POWER PLANNING COUNCIL, BONNEVILLE POWER ADM, PUGET SOUND POWER & LIGHT C1 SANDIA NATL LABS,DIV WIND ENERGY RES 6214,ALBUQUERQUE,NM 87185. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMERICAN WIND ENERGY ASSOCIATION PI WASHINGTON PA 122 C STREET NW 4TH FLOOR, WASHINGTON, DC 20001-2109 PY 1992 BP 267 EP 275 PG 9 WC Energy & Fuels; Engineering, Environmental SC Energy & Fuels; Engineering GA BB70D UT WOS:A1992BB70D00034 ER PT B AU LOBITZ, DW ARGUELLO, JG VEERS, PS AF LOBITZ, DW ARGUELLO, JG VEERS, PS GP AMER WIND ENERGY ASSOC TI ELASTIC DYNAMICS OF A COMPLETE WIND TURBINE STRUCTURE - THEORETICAL DEVELOPMENT SO WINDPOWER '92 PROCEEDINGS LA English DT Proceedings Paper CT Windpower 92 Annual Conference and Exhibition CY OCT 19-23, 1992 CL SEATTLE, WA SP AMER WIND ENERGY ASSOC, US DOE, NATL RENEWABLE ENERGY LAB, NW POWER PLANNING COUNCIL, BONNEVILLE POWER ADM, PUGET SOUND POWER & LIGHT C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN WIND ENERGY ASSOCIATION PI WASHINGTON PA 122 C STREET NW 4TH FLOOR, WASHINGTON, DC 20001-2109 PY 1992 BP 307 EP 312 PG 6 WC Energy & Fuels; Engineering, Environmental SC Energy & Fuels; Engineering GA BB70D UT WOS:A1992BB70D00039 ER PT B AU SUTHERLAND, HJ OSGOOD, RM AF SUTHERLAND, HJ OSGOOD, RM GP AMER WIND ENERGY ASSOC TI FREQUENCY-DOMAIN SYNTHESIS OF THE FATIGUE LOAD SPECTRUM FOR THE NPS-100-KW WIND TURBINE SO WINDPOWER '92 PROCEEDINGS LA English DT Proceedings Paper CT Windpower 92 Annual Conference and Exhibition CY OCT 19-23, 1992 CL SEATTLE, WA SP AMER WIND ENERGY ASSOC, US DOE, NATL RENEWABLE ENERGY LAB, NW POWER PLANNING COUNCIL, BONNEVILLE POWER ADM, PUGET SOUND POWER & LIGHT C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN WIND ENERGY ASSOCIATION PI WASHINGTON PA 122 C STREET NW 4TH FLOOR, WASHINGTON, DC 20001-2109 PY 1992 BP 321 EP 328 PG 8 WC Energy & Fuels; Engineering, Environmental SC Energy & Fuels; Engineering GA BB70D UT WOS:A1992BB70D00041 ER PT B AU WRIGHT, AD BUHL, ML ELLIOTT, AS AF WRIGHT, AD BUHL, ML ELLIOTT, AS GP AMER WIND ENERGY ASSOC TI DEVELOPMENT OF A WIND TURBINE SYSTEMS DYNAMICS MODEL USING THE AUTOMATIC DYNAMIC ANALYSIS OF MECHANICAL SYSTEMS (ADAMS) SOFTWARE SO WINDPOWER '92 PROCEEDINGS LA English DT Proceedings Paper CT Windpower 92 Annual Conference and Exhibition CY OCT 19-23, 1992 CL SEATTLE, WA SP AMER WIND ENERGY ASSOC, US DOE, NATL RENEWABLE ENERGY LAB, NW POWER PLANNING COUNCIL, BONNEVILLE POWER ADM, PUGET SOUND POWER & LIGHT C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN WIND ENERGY ASSOCIATION PI WASHINGTON PA 122 C STREET NW 4TH FLOOR, WASHINGTON, DC 20001-2109 PY 1992 BP 329 EP 338 PG 10 WC Energy & Fuels; Engineering, Environmental SC Energy & Fuels; Engineering GA BB70D UT WOS:A1992BB70D00042 ER PT B AU KELLEY, N DESROCHERS, G TANGLER, J SMITH, B AF KELLEY, N DESROCHERS, G TANGLER, J SMITH, B GP AMER WIND ENERGY ASSOC TI A DISCUSSION OF THE RESULTS OF THE RAINFLOW COUNTING OF A WIDE-RANGE OF DYNAMICS ASSOCIATED WITH THE SIMULTANEOUS OPERATION OF ADJACENT WIND TURBINES SO WINDPOWER '92 PROCEEDINGS LA English DT Proceedings Paper CT Windpower 92 Annual Conference and Exhibition CY OCT 19-23, 1992 CL SEATTLE, WA SP AMER WIND ENERGY ASSOC, US DOE, NATL RENEWABLE ENERGY LAB, NW POWER PLANNING COUNCIL, BONNEVILLE POWER ADM, PUGET SOUND POWER & LIGHT C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMERICAN WIND ENERGY ASSOCIATION PI WASHINGTON PA 122 C STREET NW 4TH FLOOR, WASHINGTON, DC 20001-2109 PY 1992 BP 372 EP 379 PG 8 WC Energy & Fuels; Engineering, Environmental SC Energy & Fuels; Engineering GA BB70D UT WOS:A1992BB70D00047 ER PT B AU BERG, DE STEPHENSON, WA CLARK, RN MULH, KE AF BERG, DE STEPHENSON, WA CLARK, RN MULH, KE GP AMER WIND ENERGY ASSOC TI A NONCONTACT BLADE SURFACE MAPPING SYSTEM SO WINDPOWER '92 PROCEEDINGS LA English DT Proceedings Paper CT Windpower 92 Annual Conference and Exhibition CY OCT 19-23, 1992 CL SEATTLE, WA SP AMER WIND ENERGY ASSOC, US DOE, NATL RENEWABLE ENERGY LAB, NW POWER PLANNING COUNCIL, BONNEVILLE POWER ADM, PUGET SOUND POWER & LIGHT C1 SANDIA NATL LABS,DEPT WIND ENERGY TECHNOL 6214,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN WIND ENERGY ASSOCIATION PI WASHINGTON PA 122 C STREET NW 4TH FLOOR, WASHINGTON, DC 20001-2109 PY 1992 BP 410 EP 417 PG 8 WC Energy & Fuels; Engineering, Environmental SC Energy & Fuels; Engineering GA BB70D UT WOS:A1992BB70D00052 ER PT B AU LAXSON, AS HOCK, SM MUSIAL, WD GOLDMAN, PR AF LAXSON, AS HOCK, SM MUSIAL, WD GOLDMAN, PR GP AMER WIND ENERGY ASSOC TI AN OVERVIEW OF DOES WIND TURBINE DEVELOPMENT PROGRAM SO WINDPOWER '92 PROCEEDINGS LA English DT Proceedings Paper CT Windpower 92 Annual Conference and Exhibition CY OCT 19-23, 1992 CL SEATTLE, WA SP AMER WIND ENERGY ASSOC, US DOE, NATL RENEWABLE ENERGY LAB, NW POWER PLANNING COUNCIL, BONNEVILLE POWER ADM, PUGET SOUND POWER & LIGHT C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN WIND ENERGY ASSOCIATION PI WASHINGTON PA 122 C STREET NW 4TH FLOOR, WASHINGTON, DC 20001-2109 PY 1992 BP 426 EP 430 PG 5 WC Energy & Fuels; Engineering, Environmental SC Energy & Fuels; Engineering GA BB70D UT WOS:A1992BB70D00054 ER PT B AU SIMMS, DA COUSINEAU, KL AF SIMMS, DA COUSINEAU, KL GP AMER WIND ENERGY ASSOC TI AN ADVANCED DATA-ACQUISITION SYSTEM FOR WIND ENERGY PROJECTS SO WINDPOWER '92 PROCEEDINGS LA English DT Proceedings Paper CT Windpower 92 Annual Conference and Exhibition CY OCT 19-23, 1992 CL SEATTLE, WA SP AMER WIND ENERGY ASSOC, US DOE, NATL RENEWABLE ENERGY LAB, NW POWER PLANNING COUNCIL, BONNEVILLE POWER ADM, PUGET SOUND POWER & LIGHT C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN WIND ENERGY ASSOCIATION PI WASHINGTON PA 122 C STREET NW 4TH FLOOR, WASHINGTON, DC 20001-2109 PY 1992 BP 476 EP 483 PG 8 WC Energy & Fuels; Engineering, Environmental SC Energy & Fuels; Engineering GA BB70D UT WOS:A1992BB70D00062 ER PT B AU MORRIS, VR BARNARD, JC WENDELL, LL TOMICH, SD AF MORRIS, VR BARNARD, JC WENDELL, LL TOMICH, SD GP AMER WIND ENERGY ASSOC TI COMPARISON OF ANEMOMETERS FOR TURBULENCE CHARACTERIZATION SO WINDPOWER '92 PROCEEDINGS LA English DT Proceedings Paper CT Windpower 92 Annual Conference and Exhibition CY OCT 19-23, 1992 CL SEATTLE, WA SP AMER WIND ENERGY ASSOC, US DOE, NATL RENEWABLE ENERGY LAB, NW POWER PLANNING COUNCIL, BONNEVILLE POWER ADM, PUGET SOUND POWER & LIGHT C1 BATTELLE MEM INST,PACIFIC NW LABS,RICHLAND,WA 99352. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN WIND ENERGY ASSOCIATION PI WASHINGTON PA 122 C STREET NW 4TH FLOOR, WASHINGTON, DC 20001-2109 PY 1992 BP 505 EP 512 PG 8 WC Energy & Fuels; Engineering, Environmental SC Energy & Fuels; Engineering GA BB70D UT WOS:A1992BB70D00066 ER PT B AU POST, WM EMANUEL, WR KING, AW AF POST, WM EMANUEL, WR KING, AW BE Batjes, NH Bridges, EM TI SOIL ORGANIC MATTER DYNAMICS AND THE GLOBAL CARBON CYCLE SO WORLD INVENTORY OF SOIL EMISSION POTENTIALS SE WISE REPORT (WORLD INVENTORY OF SOIL EMISSION) LA English DT Proceedings Paper CT International Workshop on World Inventory of Soil Emission Potentials CY AUG 24-27, 1992 CL WAGENINGEN, NETHERLANDS SP INT SOIL REFERENCE & INFORMAT CTR C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RI Post, Wilfred/B-8959-2012 NR 0 TC 4 Z9 4 U1 1 U2 6 PU INT SOIL REFERENCE & INFORMATION CENTRE PI 6700 AJ WAGENINGEN PA POSTBUS 353, 6700 AJ WAGENINGEN, NETHERLANDS BN 90-6672-049-2 J9 WISE REP PY 1992 IS 2 BP 107 EP 119 PG 13 WC Environmental Sciences; Geography; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Geography; Geology; Meteorology & Atmospheric Sciences GA BC18N UT WOS:A1992BC18N00007 ER PT S AU MATHEWS, DL AF MATHEWS, DL BE Fill, EE TI THE LIVERMORE X-RAY LASER PROGRAM SO X-RAY LASERS 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 3RD INTERNATIONAL COLLOQUIUM ON X-RAY LASER CY MAY 18-22, 1992 CL SCHLIERSEE, GERMANY RP MATHEWS, DL (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-85498-415-1 J9 INST PHYS CONF SER PY 1992 VL 125 BP 31 EP 35 PG 5 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BZ30V UT WOS:A1992BZ30V00005 ER PT S AU NILSEN, J PORTER, JL DASILVA, LB MACGOWAN, BJ AF NILSEN, J PORTER, JL DASILVA, LB MACGOWAN, BJ BE Fill, EE TI DEMONSTRATION OF A NEON-LIKE RUBIDIUM X-RAY LASER SO X-RAY LASERS 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 3RD INTERNATIONAL COLLOQUIUM ON X-RAY LASER CY MAY 18-22, 1992 CL SCHLIERSEE, GERMANY RP NILSEN, J (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-85498-415-1 J9 INST PHYS CONF SER PY 1992 VL 125 BP 53 EP 56 PG 4 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BZ30V UT WOS:A1992BZ30V00010 ER PT S AU SHIMKAVEG, GM CARTER, MR WALLING, RS TICEHURST, JM LONDON, RA STEWART, RE AF SHIMKAVEG, GM CARTER, MR WALLING, RS TICEHURST, JM LONDON, RA STEWART, RE BE Fill, EE TI OSCILLATOR-AMPLIFIER EXPERIMENTS IN NEON-LIKE YTTRIUM SO X-RAY LASERS 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 3RD INTERNATIONAL COLLOQUIUM ON X-RAY LASER CY MAY 18-22, 1992 CL SCHLIERSEE, GERMANY RP SHIMKAVEG, GM (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-43,LIVERMORE,CA 94550, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-85498-415-1 J9 INST PHYS CONF SER PY 1992 VL 125 BP 61 EP 66 PG 6 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BZ30V UT WOS:A1992BZ30V00012 ER PT S AU KOCH, JA MACGOWAN, BJ DASILVA, LB MATTHEWS, DL MROWKA, S UNDERWOOD, JH BATSON, PJ AF KOCH, JA MACGOWAN, BJ DASILVA, LB MATTHEWS, DL MROWKA, S UNDERWOOD, JH BATSON, PJ BE Fill, EE TI SELENIUM X-RAY LASER LINE-PROFILE MEASUREMENTS SO X-RAY LASERS 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 3RD INTERNATIONAL COLLOQUIUM ON X-RAY LASER CY MAY 18-22, 1992 CL SCHLIERSEE, GERMANY RP KOCH, JA (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-85498-415-1 J9 INST PHYS CONF SER PY 1992 VL 125 BP 67 EP 70 PG 4 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BZ30V UT WOS:A1992BZ30V00013 ER PT S AU NILSEN, J PORTER, JL DASILVA, LB MACGOWAN, BJ BEIERSDORFER, P ELLIOTT, SR YOUNG, BK AF NILSEN, J PORTER, JL DASILVA, LB MACGOWAN, BJ BEIERSDORFER, P ELLIOTT, SR YOUNG, BK BE Fill, EE TI EXPERIMENTS ON RESONANTLY PHOTOPUMPED X-RAY LASERS SO X-RAY LASERS 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 3RD INTERNATIONAL COLLOQUIUM ON X-RAY LASER CY MAY 18-22, 1992 CL SCHLIERSEE, GERMANY RP NILSEN, J (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-85498-415-1 J9 INST PHYS CONF SER PY 1992 VL 125 BP 137 EP 142 PG 6 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BZ30V UT WOS:A1992BZ30V00027 ER PT S AU LIBBY, SB OSTERHELD, AL SZOKE, A WALLING, RS YOUNG, BKF AF LIBBY, SB OSTERHELD, AL SZOKE, A WALLING, RS YOUNG, BKF BE Fill, EE TI PROGRESS TOWARD X-RAY LASING BETWEEN AUTOIONIZING TRANSITIONS SO X-RAY LASERS 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 3RD INTERNATIONAL COLLOQUIUM ON X-RAY LASER CY MAY 18-22, 1992 CL SCHLIERSEE, GERMANY RP LIBBY, SB (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-85498-415-1 J9 INST PHYS CONF SER PY 1992 VL 125 BP 163 EP 166 PG 4 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BZ30V UT WOS:A1992BZ30V00033 ER PT S AU EDER, DC AMENDT, P BOLTON, PR GUETHLEIN, G LONDON, RA ROSEN, MD WILKS, SC AF EDER, DC AMENDT, P BOLTON, PR GUETHLEIN, G LONDON, RA ROSEN, MD WILKS, SC BE Fill, EE TI TABLE-TOP X-RAY LASING BASED ON OPTICAL-FIELD-INDUCED IONIZATION SO X-RAY LASERS 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 3RD INTERNATIONAL COLLOQUIUM ON X-RAY LASER CY MAY 18-22, 1992 CL SCHLIERSEE, GERMANY RP EDER, DC (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-85498-415-1 J9 INST PHYS CONF SER PY 1992 VL 125 BP 177 EP 184 PG 8 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BZ30V UT WOS:A1992BZ30V00036 ER PT S AU AMENDT, P LONDON, RA STRAUSS, M AF AMENDT, P LONDON, RA STRAUSS, M BE Fill, EE TI OPTIMIZATION STUDY OF X-RAY LASER COHERENCE IN NI-LIKE TA SO X-RAY LASERS 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 3RD INTERNATIONAL COLLOQUIUM ON X-RAY LASER CY MAY 18-22, 1992 CL SCHLIERSEE, GERMANY RP AMENDT, P (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-85498-415-1 J9 INST PHYS CONF SER PY 1992 VL 125 BP 255 EP 260 PG 6 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BZ30V UT WOS:A1992BZ30V00051 ER PT S AU LONDON, RA AMENDT, P STRAUSS, M AF LONDON, RA AMENDT, P STRAUSS, M BE Fill, EE TI GEOMETRIC OPTICS SCALING LAWS FOR X-RAY LASER COHERENCE SO X-RAY LASERS 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 3RD INTERNATIONAL COLLOQUIUM ON X-RAY LASER CY MAY 18-22, 1992 CL SCHLIERSEE, GERMANY RP LONDON, RA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-85498-415-1 J9 INST PHYS CONF SER PY 1992 VL 125 BP 261 EP 264 PG 4 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BZ30V UT WOS:A1992BZ30V00052 ER PT S AU TREBES, J AF TREBES, J BE Fill, EE TI SPATIAL COHERENCE OF SOFT-X-RAY LASERS SO X-RAY LASERS 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 3RD INTERNATIONAL COLLOQUIUM ON X-RAY LASER CY MAY 18-22, 1992 CL SCHLIERSEE, GERMANY RP TREBES, J (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-85498-415-1 J9 INST PHYS CONF SER PY 1992 VL 125 BP 265 EP 268 PG 4 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BZ30V UT WOS:A1992BZ30V00053 ER PT S AU MACGOWAN, BJ MROWKA, S BARBEE, TW DASILVA, LB EDER, DC KOCH, JA UNDERWOOD, JH AF MACGOWAN, BJ MROWKA, S BARBEE, TW DASILVA, LB EDER, DC KOCH, JA UNDERWOOD, JH BE Fill, EE TI PROBLEMS IN THE IMPLEMENTATION OF X-RAY OPTICS WITH X-RAY LASERS SO X-RAY LASERS 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 3RD INTERNATIONAL COLLOQUIUM ON X-RAY LASER CY MAY 18-22, 1992 CL SCHLIERSEE, GERMANY RP MACGOWAN, BJ (reprint author), LAWRENCE LIVERMORE NATL LAB,L-476,POB 808,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-85498-415-1 J9 INST PHYS CONF SER PY 1992 VL 125 BP 269 EP 274 PG 6 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BZ30V UT WOS:A1992BZ30V00054 ER PT S AU WAN, AS WALLING, RS SCOTT, HA MAYLE, RW OSTERHELD, AL AF WAN, AS WALLING, RS SCOTT, HA MAYLE, RW OSTERHELD, AL BE Fill, EE TI SELF-CONSISTENT ONE-DIMENSIONAL MODELING OF X-RAY LASER PLASMAS SO X-RAY LASERS 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 3RD INTERNATIONAL COLLOQUIUM ON X-RAY LASER CY MAY 18-22, 1992 CL SCHLIERSEE, GERMANY RP WAN, AS (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-85498-415-1 J9 INST PHYS CONF SER PY 1992 VL 125 BP 293 EP 296 PG 4 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BZ30V UT WOS:A1992BZ30V00058 ER PT S AU OSTERHELD, AL YOUNG, BKF WALLING, RS GOLDSTEIN, WH SCOFIELD, JH CHEN, M SHIMKAVEG, G CARTER, M SHEPHERD, R MACGOWAN, BJ DASILVA, L MATTHEWS, D MAXON, S LONDON, R STEWART, RE AF OSTERHELD, AL YOUNG, BKF WALLING, RS GOLDSTEIN, WH SCOFIELD, JH CHEN, M SHIMKAVEG, G CARTER, M SHEPHERD, R MACGOWAN, BJ DASILVA, L MATTHEWS, D MAXON, S LONDON, R STEWART, RE BE Fill, EE TI ATOMIC PHYSICS MODELING OF X-RAY LASER PLASMAS SO X-RAY LASERS 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 3RD INTERNATIONAL COLLOQUIUM ON X-RAY LASER CY MAY 18-22, 1992 CL SCHLIERSEE, GERMANY RP OSTERHELD, AL (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-85498-415-1 J9 INST PHYS CONF SER PY 1992 VL 125 BP 309 EP 314 PG 6 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BZ30V UT WOS:A1992BZ30V00062 ER PT S AU RATOWSKY, RP CRAXTON, RS FEIT, MD LONDON, RA WALLING, RS SHIMKAVEG, GM OSTERHELD, AL CARTER, MR AF RATOWSKY, RP CRAXTON, RS FEIT, MD LONDON, RA WALLING, RS SHIMKAVEG, GM OSTERHELD, AL CARTER, MR BE Fill, EE TI 3-DIMENSIONAL TIME-DEPENDENT HYDRODYNAMIC AND PROPAGATION MODELING OF X-RAY LASER-EMISSION SO X-RAY LASERS 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 3RD INTERNATIONAL COLLOQUIUM ON X-RAY LASER CY MAY 18-22, 1992 CL SCHLIERSEE, GERMANY RP RATOWSKY, RP (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-85498-415-1 J9 INST PHYS CONF SER PY 1992 VL 125 BP 315 EP 318 PG 4 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BZ30V UT WOS:A1992BZ30V00063 ER PT S AU YOUNG, BKF OSTERHELD, AL SHIMKAVEG, GM WALLING, RS SHEPHERD, RL GOLDSTEIN, WH DASILVA, LB PORTER, JL STEWART, RE AF YOUNG, BKF OSTERHELD, AL SHIMKAVEG, GM WALLING, RS SHEPHERD, RL GOLDSTEIN, WH DASILVA, LB PORTER, JL STEWART, RE BE Fill, EE TI ELECTRON-TEMPERATURE MEASUREMENTS OF X-RAY LASER PLASMAS SO X-RAY LASERS 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 3RD INTERNATIONAL COLLOQUIUM ON X-RAY LASER CY MAY 18-22, 1992 CL SCHLIERSEE, GERMANY RP YOUNG, BKF (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-85498-415-1 J9 INST PHYS CONF SER PY 1992 VL 125 BP 343 EP 346 PG 4 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BZ30V UT WOS:A1992BZ30V00069 ER PT S AU DASILVA, LB TREBES, JE MROWKA, S MACGOWAN, BJ KOCH, JA MATTHEWS, DL BARBEE, TW BALHORN, R GRAY, J ANDERSON, E KERN, D ATTWOOD, D AF DASILVA, LB TREBES, JE MROWKA, S MACGOWAN, BJ KOCH, JA MATTHEWS, DL BARBEE, TW BALHORN, R GRAY, J ANDERSON, E KERN, D ATTWOOD, D BE Fill, EE TI PROGRESS IN IMAGING MICROSCOPY WITH X-RAY LASERS AT LLNL SO X-RAY LASERS 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 3RD INTERNATIONAL COLLOQUIUM ON X-RAY LASER CY MAY 18-22, 1992 CL SCHLIERSEE, GERMANY RP DASILVA, LB (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-483,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-85498-415-1 J9 INST PHYS CONF SER PY 1992 VL 125 BP 387 EP 392 PG 6 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BZ30V UT WOS:A1992BZ30V00079 ER PT S AU VALEO, EJ COWLEY, SC KRUSHELNICK, K TIGHE, W SUCKEWER, S AF VALEO, EJ COWLEY, SC KRUSHELNICK, K TIGHE, W SUCKEWER, S BE Fill, EE TI A MICROSPHERE-BASED X-RAY LASER SO X-RAY LASERS 1992 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 3RD INTERNATIONAL COLLOQUIUM ON X-RAY LASER CY MAY 18-22, 1992 CL SCHLIERSEE, GERMANY RP VALEO, EJ (reprint author), PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL SN 0951-3248 BN 0-85498-415-1 J9 INST PHYS CONF SER PY 1992 VL 125 BP 433 EP 438 PG 6 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BZ30V UT WOS:A1992BZ30V00089 ER PT J AU WANG, SL RICHARDSON, JW AF WANG, SL RICHARDSON, JW TI NEUTRON POWDER DIFFRACTION STUDY OF THE MIXED-VALENCE VANADIUM PYROPHOSPHATE RBV3P4O17 SO ZEITSCHRIFT FUR KRISTALLOGRAPHIE LA English DT Article DE RBV3P4O17; RIETVELD REFINEMENT; NEUTRON DIFFRACTION ID CRYSTAL-STRUCTURE AB Rietveld refinement using high-resolution time-of-flight neutron powder diffraction data is reported for a mixed-valence vanadium pyrophosphate of RbV3P4O17. This compound crystallizes in the tetragonal space group P4(2)/mnm (No. 136) with a = 13.65173(4), c = 7.31514(3) angstrom, V = 1363.320(8) angstrom3, Z = 4, R(I) = 0.0269, R(p) = 0.0142, R(wp) = 0.0208, and R(Riet) = 0.0427 for 81 parameters and a total of 5059 data. The structure was previously determined using single-crystal X-ray diffraction with some remaining uncertainty in the oxygen content. Our neutron study shows that three oxygen sites are partially occupied, resulting somewhat different stoichiometry from the X-ray results. A good agreement between neutron and X-ray results in both atomic coordinates and thermal parameters was obtained for this complex structure. A comparison between the results from neutron powder and single-crystal X-ray data is given. C1 ARGONNE NATL LAB,DIV IPNS,ARGONNE,IL 60439. RP WANG, SL (reprint author), NATL TSING HUA UNIV,DEPT CHEM,HSINCHU 30043,TAIWAN. NR 14 TC 0 Z9 0 U1 1 U2 1 PU R OLDENBOURG VERLAG PI MUNICH 80 PA ROSENHEIMER STR 145 POSTFACH 801360, W-8000 MUNICH 80, GERMANY SN 0044-2968 J9 Z KRISTALLOGR JI Z. Kristall. PY 1992 VL 202 IS 3-4 BP 227 EP 236 DI 10.1524/zkri.1992.202.3-4.227 PG 10 WC Crystallography SC Crystallography GA KB594 UT WOS:A1992KB59400004 ER PT J AU KIRSCH, T EICHLER, A MORIN, P WELP, U AF KIRSCH, T EICHLER, A MORIN, P WELP, U TI CALORIMETRIC EVIDENCE FOR 2 MAGNETIC PHASES IN CEPB3 UNDER PRESSURE SO ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER LA English DT Article ID CONCENTRATED KONDO SYSTEMS; HEAVY-FERMION AB Low-temperature specific heat measurements on the heavy-fermion antiferromagnet CePb3 have been performed under pressures up to 1.3 GPa. From the shift of the anomaly at T(N) the magnetic phase diagram is constructed. The change of the shape of the anomaly, when the pressure exceeds 0.7 GPa, clearly indicates the crossover from one magnetic structure to another as had already been concluded from former n-scattering results. The Kondo temperature does not show a peculiar variation with pressure. C1 CNRS, LAB LOUIS NEEL, F-38042 GRENOBLE, FRANCE. ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. RP KIRSCH, T (reprint author), TECH UNIV BRAUNSCHWEIG, INST TECH PHYS, W-3300 BRAUNSCHWEIG, GERMANY. NR 16 TC 8 Z9 8 U1 1 U2 5 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0722-3277 J9 Z PHYS B CON MAT JI Z. Phys. B-Condens. Mat. PD JAN PY 1992 VL 86 IS 1 BP 83 EP 86 DI 10.1007/BF01323551 PG 4 WC Physics, Condensed Matter SC Physics GA GV451 UT WOS:A1992GV45100014 ER PT J AU GEESAMAN, DF AF GEESAMAN, DF TI PHOTON-HADRON INTERACTIONS REVISITED IN DEEP INELASTIC MUON SCATTERING SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON THE FUTURE OF MUON PHYSICS CY MAY 07-09, 1991 CL RUPREDCHT KARLS UNIV, HEIDELBERG, GERMANY SP STATE BADEN WURTTEMBERG, COHERNET, DEUT FORSCHUNGSGEMEINSCH, UNIV HEIDELBERG, BALZERS HOCHVAKUUM, IBM GERMANY HO RUPREDCHT KARLS UNIV ID DEUTERON STRUCTURE FUNCTIONS; HIGH STATISTICS MEASUREMENT; PROTON STRUCTURE FUNCTIONS; SMALL-X; HIGH Q2; J/PSI AB New results for deep inelastic muon scattering are reviewed. These include shadowing results to X(bj) approximately 10(-5), nucleon structure functions measurements, the Gottfried sum rule and the use of deep inelastic scattering to obtain information on gluon distributions. The future of muon scattering in the HERA era is discussed. RP GEESAMAN, DF (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 32 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PY 1992 VL 56 SU S BP S159 EP S168 DI 10.1007/BF02426792 PG 10 WC Physics, Particles & Fields SC Physics GA JZ406 UT WOS:A1992JZ40600026 ER PT J AU HERCZEG, P AF HERCZEG, P TI THE NEUTRINOS IN MUON DECAY SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON THE FUTURE OF MUON PHYSICS CY MAY 07-09, 1991 CL RUPREDCHT KARLS UNIV, HEIDELBERG, GERMANY SP STATE BADEN WURTTEMBERG, COHERNET, DEUT FORSCHUNGSGEMEINSCH, UNIV HEIDELBERG, BALZERS HOCHVAKUUM, IBM GERMANY HO RUPREDCHT KARLS UNIV ID LEPTON-NUMBER; BETA-DECAY; ANTIMUONIUM; CONSERVATION; UNIFICATION; CONVERSION; VIOLATION; SEARCH; MODEL AB We review the available information on the identity of the neutrino states emitted in muon decay, and discuss the exotic decay mu+ --> e+nu(e)nu(mu)BAR. RP HERCZEG, P (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 35 TC 3 Z9 3 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PY 1992 VL 56 SU S BP S129 EP S134 DI 10.1007/BF02426786 PG 6 WC Physics, Particles & Fields SC Physics GA JZ406 UT WOS:A1992JZ40600020 ER PT J AU LEON, M AF LEON, M TI MUON-CATALYZED FUSION THEORY SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON THE FUTURE OF MUON PHYSICS CY MAY 07-09, 1991 CL RUPREDCHT KARLS UNIV, HEIDELBERG, GERMANY SP STATE BADEN WURTTEMBERG, COHERNET, DEUT FORSCHUNGSGEMEINSCH, UNIV HEIDELBERG, BALZERS HOCHVAKUUM, IBM GERMANY HO RUPREDCHT KARLS UNIV ID D-T-FUSION; MOLECULAR FORMATION; CROSS-SECTION; BACK-DECAY; DEUTERIUM; HYDROGEN AB Some topics in muon-catalyzed fusion theory are discussed: Resonant formation of ddmu molecules appears to be well understood, with good agreement so far between theory and experiment. The situation for resonant dtmu formation is much less clear, because of the more complicated kinetics, the apparent three-body effect, and the evident need to treat thermalization and molecular formation together to compare theory and experiment. Recent theoretical progress in pdmu fusion by Friar et al. has resolved a serious discrepancy in the Wolfenstein-Gershtein effect, i.e., the increase in pdmu fusion yield with increased deuterium fraction. RP LEON, M (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 51 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PY 1992 VL 56 SU S BP S203 EP S209 DI 10.1007/BF02426797 PG 7 WC Physics, Particles & Fields SC Physics GA JZ406 UT WOS:A1992JZ40600031 ER PT J AU PILLAI, C AF PILLAI, C TI EXISTING MUON BEAMS AT LAMPF SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON THE FUTURE OF MUON PHYSICS CY MAY 07-09, 1991 CL RUPREDCHT KARLS UNIV, HEIDELBERG, GERMANY SP STATE BADEN WURTTEMBERG, COHERNET, DEUT FORSCHUNGSGEMEINSCH, UNIV HEIDELBERG, BALZERS HOCHVAKUUM, IBM GERMANY HO RUPREDCHT KARLS UNIV ID CHANNEL RP PILLAI, C (reprint author), LOS ALAMOS NATL LAB,DIV MEDIUM ENERGY PHYS,LOS ALAMOS,NM 87545, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PY 1992 VL 56 SU S BP S223 EP S225 DI 10.1007/BF02426800 PG 3 WC Physics, Particles & Fields SC Physics GA JZ406 UT WOS:A1992JZ40600034 ER PT J AU THIESSEN, HA WHITE, DH AF THIESSEN, HA WHITE, DH TI PILAC - A PION LINAC FACILITY FOR 1-GEV PION PHYSICS AT LAMPF SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON THE FUTURE OF MUON PHYSICS CY MAY 07-09, 1991 CL RUPREDCHT KARLS UNIV, HEIDELBERG, GERMANY SP STATE BADEN WURTTEMBERG, COHERNET, DEUT FORSCHUNGSGEMEINSCH, UNIV HEIDELBERG, BALZERS HOCHVAKUUM, IBM GERMANY HO RUPREDCHT KARLS UNIV AB A design study for a Pion Linac (PILAC) at LAMPF is under way at Los Alamos. We present here a reference design for a system of pion source, linac, and high-resolution beam line and spectrometer that will provide 10(9) pions per second on target and 200-keV resolution for the (pi+,K+) reaction at 0.92 GeV. A general-purpose beam line that delivers both positive and negative pions in the energy range 0.4-1.1 GeV is included, thus opening up the possibility of a broad experimental program as is discussed in this report. A kicker-based beam sharing system allows delivery of beam to both beam lines simultaneously with independent sign and energy control. Because the pion linac acts like an rf particle separator, all beams produced by PILAC will be free of electron (or positron) and proton contamination. RP THIESSEN, HA (reprint author), LOS ALAMOS NATL LAB,DIV MEDIUM ENERGY PHYS,LOS ALAMOS,NM 87545, USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PY 1992 VL 56 SU S BP S285 EP S288 DI 10.1007/BF02426811 PG 4 WC Physics, Particles & Fields SC Physics GA JZ406 UT WOS:A1992JZ40600045 ER PT J AU WHITE, DH AF WHITE, DH TI MEDIUM-ENERGY NEUTRINO PHYSICS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON THE FUTURE OF MUON PHYSICS CY MAY 07-09, 1991 CL RUPREDCHT KARLS UNIV, HEIDELBERG, GERMANY SP STATE BADEN WURTTEMBERG, COHERNET, DEUT FORSCHUNGSGEMEINSCH, UNIV HEIDELBERG, BALZERS HOCHVAKUUM, IBM GERMANY HO RUPREDCHT KARLS UNIV AB A selection of opportunities for neutrino physics from a source generated from pions that decay in flight and at rest is described. The present source at LAMPF has a duty factor of about 6%; improvements in opportunities that emerge from a source using a pulse 0.25 musec long from a proton storage ring are also described. RP WHITE, DH (reprint author), LOS ALAMOS NATL LAB,DIV MEDIUM ENERGY PHYS,LOS ALAMOS,NM 87545, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PY 1992 VL 56 SU S BP S180 EP S193 PG 14 WC Physics, Particles & Fields SC Physics GA JZ406 UT WOS:A1992JZ40600029 ER PT J AU WHITE, DH AF WHITE, DH TI A PULSED LEPTON SOURCE AT LAMPF SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON THE FUTURE OF MUON PHYSICS CY MAY 07-09, 1991 CL RUPREDCHT KARLS UNIV, HEIDELBERG, GERMANY SP STATE BADEN WURTTEMBERG, COHERNET, DEUT FORSCHUNGSGEMEINSCH, UNIV HEIDELBERG, BALZERS HOCHVAKUUM, IBM GERMANY HO RUPREDCHT KARLS UNIV AB A Pulsed Lepton Source is being considered at the LAMPF facility at Los Alamos National Laboratory. The source plan is described together with a description of the components and performance as they exist at present. RP WHITE, DH (reprint author), LOS ALAMOS NATL LAB,DIV MEDIUM ENERGY PHYS,LOS ALAMOS,NM 87545, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PY 1992 VL 56 SU S BP S255 EP S257 DI 10.1007/BF02426806 PG 3 WC Physics, Particles & Fields SC Physics GA JZ406 UT WOS:A1992JZ40600040 ER PT J AU DECAMP, D DESCHIZEAUX, B GOY, C LEES, JP MINARD, MN ALEMANY, R CRESPO, JM DELFINO, M FERNANDEZ, E GAITAN, V GARRIDO, L MIR, LM PACHECO, A CATANESI, MG CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G GAO, Y HU, H HUANG, D HUANG, X LIN, J LOU, J QIAO, C RUAN, T WANG, T XIE, Y XU, D XU, R ZHANG, J ZHAO, W ATWOOD, WB BAUERDICK, LAT BIRD, F BLUCHER, E BONVICINI, G BOSSI, F BOUDREAU, J BROWN, D BURNETT, TH DREVERMANN, H FORTY, RW GRAB, C HAGELBERG, R HAYWOOD, S HILGART, J JOST, B KASEMANN, M KNOBLOCH, J LACOURT, A LANCON, E LEHRAUS, I LOHSE, T LUSIANI, A MARCHIORO, A MARTINEZ, M MATO, P MENARY, S MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG NASH, J PALAZZI, P RANJARD, F REDLINGER, G ROTH, A ROTHBERG, J ROTSCHEIDT, H SAICH, M DENIS, RS SCHLATTER, D TAKASHIMA, M TALBY, M TEJESSY, W WACHSMUTH, H WASSERBAECH, S WHEELER, S WIEDENMANN, W WITZELING, W WOTSCHACK, J AJALTOUNI, Z BARDADINOTWINOWSKA, M ELFELLOUS, R FALVARD, A 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 NILSSON, BS EFTHYMIOPOULOS, I SIMOPOULOU, E VAYAKI, A BADIER, J BLONDEL, A BONNEAUD, G BOUROTTE, J BRAEMS, F BRIENT, JC FOUQUE, G GAMESS, A GUIRLET, R ORTEU, S ROSOWSKY, A ROUGE, A RUMPF, M TANAKA, R VIDEAU, H CANDLIN, DJ VEITCH, E 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 CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP NICOLETTI, G PASSALACQUA, L PEPEALTARELLI, M PICCHI, P ZOGRAFOU, P ALTOON, B BOYLE, O HALLEY, AW TENHAVE, 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 KLEINKNECHT, K RAAB, J RENK, B ROEHN, S SANDER, HG SCHMELLING, M SCHMIDT, H STEEG, F WALTHER, SM WOLF, B ALBANESE, JP AUBERT, JJ BENCHOUK, C BERNARD, V BONISSENT, A COURVOISIER, D ETIENNE, F PAPALEXIOU, S PAYRE, P PIETRZYK, B QIAN, Z BECKER, H BLUM, W CATTANEO, P COWAN, G DEHNING, B DIETL, H DYDAK, F FERNANDEZBOSMAN, M HANSLKOZANECKA, T JAHN, A KOZANECKI, W LANGE, E LAUBER, J LUTJENS, G LUTZ, G MANNER, W PAN, Y RICHTER, R SCHRODER, J SCHWARZ, AS SETTLES, R STIERLIN, U THOMAS, J WOLF, G BERTIN, V BOUCROT, J CALLOT, O CHEN, X CORDIER, A DAVIER, M GANIS, G GRIVAZ, JF HEUSSE, P JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM VEILLET, JJ VIDEAU, I ZHANG, Z ZOMER, F ABBANEO, D AMENDOLIA, SR BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BRADASCHIA, C CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GATTO, C GIASSI, A GIORGI, MA LIGABUE, F MANNELLI, EB MARROCCHESI, PS MESSINEO, A MONETA, L PALLA, F SANGUINETTI, G STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J CARTER, JM GREEN, MG MARCH, PV MEDCALF, T QUAZI, IS STRONG, JA THOMAS, RM WEST, LR WILDISH, T BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P KLOPFENSTEIN, C LOCCI, E LOUCATOS, S MONNIER, E PEREZ, P PERLAS, JA PERRIER, F RANDER, J RENARDY, JF ROUSSARIE, A SCHULLER, JP SCHWINDLING, J VALLAGE, B ASHMAN, JG BOOTH, CN BUTTAR, C CARNEY, R CARTWRIGHT, S COMBLEY, F DINSDALE, M DOGRU, M HATFIELD, F MARTIN, J PARKER, D REEVES, P THOMPSON, LF BARBERIO, E BRANDT, S BURKHARDT, H GRUPEN, C MEINHARD, H MIRABITO, L SCHAFER, U SEYWERD, H APOLLINARI, G GIANNINI, G GOBBO, B LIELLO, F RAGUSA, F ROLANDI, L STIEGLER, U BELLANTONI, L CHEN, X CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JACOBSEN, JE JARED, RC JOHNSON, RP LECLAIRE, BW PAN, YB PATER, JR SAADI, Y SHARMA, V SHI, ZH TANG, YH WALSH, AM WEAR, JA WEBER, FV WHITNEY, MH WU, SL ZOBERNIG, G AF DECAMP, D DESCHIZEAUX, B GOY, C LEES, JP MINARD, MN ALEMANY, R CRESPO, JM DELFINO, M FERNANDEZ, E GAITAN, V GARRIDO, L MIR, LM PACHECO, A CATANESI, MG CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G GAO, Y HU, H HUANG, D HUANG, X LIN, J LOU, J QIAO, C RUAN, T WANG, T XIE, Y XU, D XU, R ZHANG, J ZHAO, W ATWOOD, WB BAUERDICK, LAT BIRD, F BLUCHER, E BONVICINI, G BOSSI, F BOUDREAU, J BROWN, D BURNETT, TH DREVERMANN, H FORTY, RW GRAB, C HAGELBERG, R HAYWOOD, S HILGART, J JOST, B KASEMANN, M KNOBLOCH, J LACOURT, A LANCON, E LEHRAUS, I LOHSE, T LUSIANI, A MARCHIORO, A MARTINEZ, M MATO, P MENARY, S MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG NASH, J PALAZZI, P RANJARD, F REDLINGER, G ROTH, A ROTHBERG, J ROTSCHEIDT, H SAICH, M DENIS, RS SCHLATTER, D TAKASHIMA, M TALBY, M TEJESSY, W WACHSMUTH, H WASSERBAECH, S WHEELER, S WIEDENMANN, W WITZELING, W WOTSCHACK, J AJALTOUNI, Z BARDADINOTWINOWSKA, M ELFELLOUS, R FALVARD, A 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 NILSSON, BS EFTHYMIOPOULOS, I SIMOPOULOU, E VAYAKI, A BADIER, J BLONDEL, A BONNEAUD, G BOUROTTE, J BRAEMS, F BRIENT, JC FOUQUE, G GAMESS, A GUIRLET, R ORTEU, S ROSOWSKY, A ROUGE, A RUMPF, M TANAKA, R VIDEAU, H CANDLIN, DJ VEITCH, E 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 CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP NICOLETTI, G PASSALACQUA, L PEPEALTARELLI, M PICCHI, P ZOGRAFOU, P ALTOON, B BOYLE, O HALLEY, AW TENHAVE, 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 KLEINKNECHT, K RAAB, J RENK, B ROEHN, S SANDER, HG SCHMELLING, M SCHMIDT, H STEEG, F WALTHER, SM WOLF, B ALBANESE, JP AUBERT, JJ BENCHOUK, C BERNARD, V BONISSENT, A COURVOISIER, D ETIENNE, F PAPALEXIOU, S PAYRE, P PIETRZYK, B QIAN, Z BECKER, H BLUM, W CATTANEO, P COWAN, G DEHNING, B DIETL, H DYDAK, F FERNANDEZBOSMAN, M HANSLKOZANECKA, T JAHN, A KOZANECKI, W LANGE, E LAUBER, J LUTJENS, G LUTZ, G MANNER, W PAN, Y RICHTER, R SCHRODER, J SCHWARZ, AS SETTLES, R STIERLIN, U THOMAS, J WOLF, G BERTIN, V BOUCROT, J CALLOT, O CHEN, X CORDIER, A DAVIER, M GANIS, G GRIVAZ, JF HEUSSE, P JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM VEILLET, JJ VIDEAU, I ZHANG, Z ZOMER, F ABBANEO, D AMENDOLIA, SR BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BRADASCHIA, C CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GATTO, C GIASSI, A GIORGI, MA LIGABUE, F MANNELLI, EB MARROCCHESI, PS MESSINEO, A MONETA, L PALLA, F SANGUINETTI, G STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J CARTER, JM GREEN, MG MARCH, PV MEDCALF, T QUAZI, IS STRONG, JA THOMAS, RM WEST, LR WILDISH, T BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P KLOPFENSTEIN, C LOCCI, E LOUCATOS, S MONNIER, E PEREZ, P PERLAS, JA PERRIER, F RANDER, J RENARDY, JF ROUSSARIE, A SCHULLER, JP SCHWINDLING, J VALLAGE, B ASHMAN, JG BOOTH, CN BUTTAR, C CARNEY, R CARTWRIGHT, S COMBLEY, F DINSDALE, M DOGRU, M HATFIELD, F MARTIN, J PARKER, D REEVES, P THOMPSON, LF BARBERIO, E BRANDT, S BURKHARDT, H GRUPEN, C MEINHARD, H MIRABITO, L SCHAFER, U SEYWERD, H APOLLINARI, G GIANNINI, G GOBBO, B LIELLO, F RAGUSA, F ROLANDI, L STIEGLER, U BELLANTONI, L CHEN, X CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JACOBSEN, JE JARED, RC JOHNSON, RP LECLAIRE, BW PAN, YB PATER, JR SAADI, Y SHARMA, V SHI, ZH TANG, YH WALSH, AM WEAR, JA WEBER, FV WHITNEY, MH WU, SL ZOBERNIG, G TI IMPROVED MEASUREMENTS OF ELECTROWEAK PARAMETERS FROM Z-DECAYS INTO FERMION PAIRS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID SEMILEPTONIC NEUTRINO SCATTERING; ORDER RADIATIVE-CORRECTIONS; MONTE-CARLO SIMULATION; PRECISE DETERMINATION; PHOTON CORRECTIONS; BHABHA SCATTERING; CROSS-SECTIONS; HIGH-ENERGIES; MIXING ANGLE; MASS AB The properties of the Z resonance are measured on the basis of 190000 Z decays into fermion pairs collected with the ALEPH detector at LEP. Assuming lepton universality, M(Z) = (91.182 +/- 0.009exp +/- 0.020L;P) GeV, GAMMA(Z) = (2484 +/- 17) MeV, sigma(had)0 = (41.44 +/- 0.36) nb, and GAMMA(had)/GAMMA(ll) = 21.00 +/- 0.20. The corresponding number of light neutrino species is 2.97 +/- 0.07. The forward-backward asymmetry in leptonic decays is used to determine the ratio of vector to axial-vector coupling constants of leptons: g(V)2(M(Z)2)/g(A)2(M(Z)2) = 0.0072 +/- 0.0027. Combining these results with ALEPH results on quark charge and bbBAR asymmetries, and tau-polarization, sin2 theta(W)(M(Z)2) = 0.2312 +/- 0.0018. In the context of the Minimal Standard Model, limits are placed on the top-quark mass. C1 UNIV AUTONOMA BARCELONA,FIS ALTAS ENERGIAS LAB,E-08193 BARCELONA,SPAIN. CHINESE ACAD SCI,INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA. CERN,EUROPEAN LAB PARTICLE PHYS,CH-1211 GENEVA 23,SWITZERLAND. UNIV CLERMONT FERRAND,PHYS CORPUSCULAIRE LAB,CNRS,F-63177 CLERMONT FERRAND,FRANCE. NIELS BOHR INST,DK-2100 COPENHAGEN,DENMARK. DEMOCRITOS NUCL RES CTR,ATHENS,GREECE. ECOLE POLYTECH,PHYS NUCL & HAUTES ENERGIES LAB,CNRS,F-91128 PALAISEAU,FRANCE. UNIV EDINBURGH,DEPT PHYS,EDINBURGH EH9 3JZ,MIDLOTHIAN,SCOTLAND. FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306. FLORIDA STATE UNIV,SUPERCOMP COMPUTAT RES INST,TALLAHASSEE,FL 32306. IST NAZL FIS NUCL,NAZ LAB,I-00044 FRASCATI,ITALY. UNIV GLASGOW,DEPT PHYS & ASTRON,GLASGOW G12 8QQ,SCOTLAND. UNIV HEIDELBERG,INST HOCHENERGIEPHYS,W-6900 HEIDELBERG,GERMANY. UNIV LONDON IMPERIAL COLL SCI & TECHNOL,DEPT PHYS,LONDON SW7 2BZ,ENGLAND. UNIV INNSBRUCK,INST EXPTL PHYS,A-6020 INNSBRUCK,AUSTRIA. UNIV LANCASTER,DEPT PHYS,LANCASTER LA1 4YB,ENGLAND. UNIV MAINZ,INST PHYS,W-6500 MAINZ,GERMANY. FAC SCI LUMINY,CTR PHYS PARTICULES,CNRS,F-13288 MARSEILLE,FRANCE. MAX PLANCK INST PHYS & ASTROPHYS,WERNER HEISENBERG INST PHYS,W-8000 MUNICH 40,GERMANY. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,CNRS,F-91405 ORSAY,FRANCE. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. UNIV LONDON,ROYAL HOLLOWAY & BEDFORD NEW COLL,DEPT PHYS,SURREY TW20 0EX,ENGLAND. RUTHERFORD APPLETON LAB,DEPT PARTICLE PHYS,DIDCOT OX11 0QX,OXON,ENGLAND. CENS,DEPT PHYS PARTICULES ELEMENTAIRES,F-91191 GIF SUR YVETTE,FRANCE. UNIV SHEFFIELD,DEPT PHYS,SHEFFIELD S3 7RH,S YORKSHIRE,ENGLAND. UNIV SIEGEN,FACHBEREICH PHYS,W-5900 SIEGEN,GERMANY. UNIV TRIESTE,DIPARTMENTO FIS,I-34127 TRIESTE,ITALY. UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. UNIV TURIN,IST FIS GEN,I-10124 TURIN,ITALY. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. CERN,DIV PPE,CH-1211 GENEVA 23,SWITZERLAND. SLAC,STANFORD,CA 94309. FAC SCI MARSEILLE,CTR PHYS PARTICULES,MARSEILLE,FRANCE. CNR,IST COSMO GEOFIS,TURIN,ITALY. IST NAZL FIS NUCL,SEZIONE BARI,BARI,ITALY. UNIV BARI,DIPARTMENTO FIS,I-70126 BARI,ITALY. UNIV FLORENCE,DIPARTMENTO FIS,IST NAZL FIS NUCL,SEZIONE FIRENZE,I-50125 FLORENCE,ITALY. UNIV PISA,DIPARTMENTO FIS,IST NAZL FIS NUCL,SEZIONE PISA,I-56100 PISA,ITALY. UNIV WASHINGTON,SEATTLE,WA 98195. IST NAZL FIS NUCL,SEZIONE TRIESTE,I-34127 TRIESTE,ITALY. RP DECAMP, D (reprint author), CNRS,PHYS PARTICULES LAB,IN2P3,F-74019 ANNECY LE VIEUX,FRANCE. RI ANTONELLI, ANTONELLA/C-6238-2011; Buttar, Craig/D-3706-2011; Stahl, Achim/E-8846-2011; Passalacqua, Luca/F-5127-2011; Forti, Francesco/H-3035-2011; Focardi, Ettore/E-7376-2012; Venturi, Andrea/J-1877-2012; Perrier, Frederic/A-5953-2011; Rolandi, Luigi (Gigi)/E-8563-2013; Colas, Paul/F-2876-2013; Delfino, Manuel/A-1545-2012; Bosman, Martine/J-9917-2014; Fernandez, Enrique/L-5387-2014; Ligabue, Franco/F-3432-2014; Mir, Lluisa-Maria/G-7212-2015; ciocci, maria agnese /I-2153-2015; Lusiani, Alberto/N-2976-2015; Marrocchesi, Pier Simone/N-9068-2015; Lusiani, Alberto/A-3329-2016; Murtas, Fabrizio/B-5729-2012; Booth, Christopher/B-5263-2016; Pacheco Pages, Andres/C-5353-2011; Ferrante, Isidoro/F-1017-2012; OI Stahl, Achim/0000-0002-8369-7506; Forti, Francesco/0000-0001-6535-7965; Focardi, Ettore/0000-0002-3763-5267; Rolandi, Luigi (Gigi)/0000-0002-0635-274X; Delfino, Manuel/0000-0002-9468-4751; Bosman, Martine/0000-0002-7290-643X; Fernandez, Enrique/0000-0002-6405-9488; Bottigli, Ubaldo/0000-0002-0666-3433; Ligabue, Franco/0000-0002-1549-7107; Bloch-Devaux, Brigitte/0000-0002-2463-1232; Murtas, Fabrizio/0000-0002-7041-6541; Garrido Beltran, Lluis/0000-0001-8883-6539; Edgecock, Rob/0000-0002-7896-3312; 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; Lusiani, Alberto/0000-0002-6876-3288; Booth, Christopher/0000-0002-6051-2847; Pacheco Pages, Andres/0000-0001-8210-1734; Ferrante, Isidoro/0000-0002-0083-7228; Palazzi, Paolo/0000-0002-4861-391X; RASO, Giuseppe/0000-0002-5660-3711 NR 63 TC 83 Z9 83 U1 0 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JAN PY 1992 VL 53 IS 1 BP 1 EP 20 PG 20 WC Physics, Particles & Fields SC Physics GA HA667 UT WOS:A1992HA66700001 ER PT J AU DECAMP, D DESCHIZEAUX, B GOY, C LEES, JP MINARD, MN ALEMANY, R CRESPO, JM DELFINO, M FERNANDEZ, E GAITAN, V GARRIDO, L MIR, LM PACHECO, A CATANESI, MG CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G GAO, Y HU, H HUANG, D HUANG, X LIN, J LOU, J QIAO, C RUAN, T WANG, T XIE, Y XU, D XU, R ZHANG, J ZHAO, W ATWOOD, WB BAUERDICK, LAT BIRD, F BLUCHER, E BONVICINI, G BOSSI, F BOUDREAU, J BROWN, D BURNETT, TH DREVERMANN, H FORTY, RW GRAB, C HAGELBERG, R HAYWOOD, S HILGART, J JOST, B KASEMANN, M KNOBLOCH, J LACOURT, A LANCON, E LEHRAUS, I LOHSE, T LUSIANI, A MARCHIORO, A MARTINEZ, M MATO, P MENARY, S MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG NASH, J PALAZZI, P RANJARD, F REDLINGER, G ROTH, A ROTHBERG, J ROTSCHEIDT, H SAICH, M SCHLATTER, D SCHMELLING, M TAKASHIMA, M TEJESSY, W WACHSMUTH, H WASSERBAECH, S WIEDENMANN, W WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M BENCHEIKH, AM ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HARVEY, J HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PRORIOL, J PRULHIERE, F STIMPFL, G HANSEN, JD HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I SIMOPOULOU, E VAYAKI, A BADIER, J BLONDEL, A BONNEAUD, G BOUROTTE, J BRAEMS, F BRIENT, JC FOUQUE, G GAMESS, A GUIRLET, R ORTEU, S ROSOWSKY, A ROUGE, A RUMPF, M TANAKA, R VIDEAU, H CANDLIN, DJ VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP NICOLETTI, G PASSALACQUA, L PEPEALTARELLI, M PICCHI, P ZOGRAFOU, P ALTOON, B BOYLE, O HALLEY, AW TENHAVE, 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 KLEINKNECHT, K RAAB, J RENK, B ROEHN, S SANDER, HG SCHMIDT, H STEEG, F WALTHER, SM WOLF, B ALBANESE, JP AUBERT, JJ BENCHOUK, C BERNARD, V BONISSENT, A COURVOISIER, D ETIENNE, F PAPALEXIOU, S PAYRE, P PIETRZYK, B QIAN, Z TALBY, M BECKER, H BLUM, W CATTANEO, P COWAN, G DEHNING, B DIETL, H DYDAK, F FERNANDEZBOSMAN, M HANSLKOZANECKA, T JAHN, A KOZANECKI, W LANGE, E LAUBER, J LUTJENS, G LUTZ, G MANNER, W PAN, Y RICHTER, R SCHRODER, J SCHWARZ, AS SETTLES, R STIERLIN, U DENIS, RS THOMAS, J WOLF, G BERTIN, V BOUCROT, J CALLOT, O CHEN, X CORDIER, A DAVIER, M GANIS, G GRIVAZ, JF HEUSSE, P JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM VEILLET, JJ VIDEAU, I ZHANG, Z ZOMER, F ABBANEO, D AMENDOLIA, SR BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BRADASCHIA, C CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GATTO, C GIASSI, A GIORGI, MA LIGABUE, F MANNELLI, EB MARROCHESI, PS MESSINEO, A MONETA, L PALLA, F SANGUINETTI, G STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J CARTER, JM GREEN, MG MARCH, PV MEDCALF, T QUAZI, IS STRONG, JA THOMAS, RM WEST, LR WILDISH, T BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P KLOPFENSTEIN, C LOCCI, E LOUCATOS, S MONNIER, E PEREZ, P PERLAS, JA PERRIER, F RANDER, J RENARDY, JF ROUSSARIE, A SCHULLER, JP SCHWINDLING, J VALLAGE, B ASHMAN, JG BOOTH, CN BUTTAR, C CARNEY, R CARTWRIGHT, S COMBLEY, F DINSDALE, M DOGRU, M HATFIELD, F MARTIN, J PARKER, D REEVES, P THOMPSON, LF BARBERIO, E BRANDT, S BURKHARDT, H GRUPEN, C MEINHARD, H MIRABITO, L SCHAFER, U SEYWERD, H GIANNINI, G GOBBO, B RAGUSA, F ROLANDI, L STIEGLER, U BELLANTONI, L CHEN, X CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JACOBSEN, JE JARED, RC JOHNSON, RP LECLAIRE, BW PAN, YB PATER, JR SAADI, Y SHARMA, V SHI, ZH TANG, YH WALSH, AM WEAR, JA WEBER, FV WHITNEY, MH WU, SL ZOBERNIG, G AF DECAMP, D DESCHIZEAUX, B GOY, C LEES, JP MINARD, MN ALEMANY, R CRESPO, JM DELFINO, M FERNANDEZ, E GAITAN, V GARRIDO, L MIR, LM PACHECO, A CATANESI, MG CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G GAO, Y HU, H HUANG, D HUANG, X LIN, J LOU, J QIAO, C RUAN, T WANG, T XIE, Y XU, D XU, R ZHANG, J ZHAO, W ATWOOD, WB BAUERDICK, LAT BIRD, F BLUCHER, E BONVICINI, G BOSSI, F BOUDREAU, J BROWN, D BURNETT, TH DREVERMANN, H FORTY, RW GRAB, C HAGELBERG, R HAYWOOD, S HILGART, J JOST, B KASEMANN, M KNOBLOCH, J LACOURT, A LANCON, E LEHRAUS, I LOHSE, T LUSIANI, A MARCHIORO, A MARTINEZ, M MATO, P MENARY, S MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG NASH, J PALAZZI, P RANJARD, F REDLINGER, G ROTH, A ROTHBERG, J ROTSCHEIDT, H SAICH, M SCHLATTER, D SCHMELLING, M TAKASHIMA, M TEJESSY, W WACHSMUTH, H WASSERBAECH, S WIEDENMANN, W WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M BENCHEIKH, AM ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HARVEY, J HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PRORIOL, J PRULHIERE, F STIMPFL, G HANSEN, JD HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I SIMOPOULOU, E VAYAKI, A BADIER, J BLONDEL, A BONNEAUD, G BOUROTTE, J BRAEMS, F BRIENT, JC FOUQUE, G GAMESS, A GUIRLET, R ORTEU, S ROSOWSKY, A ROUGE, A RUMPF, M TANAKA, R VIDEAU, H CANDLIN, DJ VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP NICOLETTI, G PASSALACQUA, L PEPEALTARELLI, M PICCHI, P ZOGRAFOU, P ALTOON, B BOYLE, O HALLEY, AW TENHAVE, 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 KLEINKNECHT, K RAAB, J RENK, B ROEHN, S SANDER, HG SCHMIDT, H STEEG, F WALTHER, SM WOLF, B ALBANESE, JP AUBERT, JJ BENCHOUK, C BERNARD, V BONISSENT, A COURVOISIER, D ETIENNE, F PAPALEXIOU, S PAYRE, P PIETRZYK, B QIAN, Z TALBY, M BECKER, H BLUM, W CATTANEO, P COWAN, G DEHNING, B DIETL, H DYDAK, F FERNANDEZBOSMAN, M HANSLKOZANECKA, T JAHN, A KOZANECKI, W LANGE, E LAUBER, J LUTJENS, G LUTZ, G MANNER, W PAN, Y RICHTER, R SCHRODER, J SCHWARZ, AS SETTLES, R STIERLIN, U DENIS, RS THOMAS, J WOLF, G BERTIN, V BOUCROT, J CALLOT, O CHEN, X CORDIER, A DAVIER, M GANIS, G GRIVAZ, JF HEUSSE, P JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM VEILLET, JJ VIDEAU, I ZHANG, Z ZOMER, F ABBANEO, D AMENDOLIA, SR BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BRADASCHIA, C CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GATTO, C GIASSI, A GIORGI, MA LIGABUE, F MANNELLI, EB MARROCHESI, PS MESSINEO, A MONETA, L PALLA, F SANGUINETTI, G STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J CARTER, JM GREEN, MG MARCH, PV MEDCALF, T QUAZI, IS STRONG, JA THOMAS, RM WEST, LR WILDISH, T BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P KLOPFENSTEIN, C LOCCI, E LOUCATOS, S MONNIER, E PEREZ, P PERLAS, JA PERRIER, F RANDER, J RENARDY, JF ROUSSARIE, A SCHULLER, JP SCHWINDLING, J VALLAGE, B ASHMAN, JG BOOTH, CN BUTTAR, C CARNEY, R CARTWRIGHT, S COMBLEY, F DINSDALE, M DOGRU, M HATFIELD, F MARTIN, J PARKER, D REEVES, P THOMPSON, LF BARBERIO, E BRANDT, S BURKHARDT, H GRUPEN, C MEINHARD, H MIRABITO, L SCHAFER, U SEYWERD, H GIANNINI, G GOBBO, B RAGUSA, F ROLANDI, L STIEGLER, U BELLANTONI, L CHEN, X CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JACOBSEN, JE JARED, RC JOHNSON, RP LECLAIRE, BW PAN, YB PATER, JR SAADI, Y SHARMA, V SHI, ZH TANG, YH WALSH, AM WEAR, JA WEBER, FV WHITNEY, MH WU, SL ZOBERNIG, G TI AN INVESTIGATION INTO INTERMITTENCY SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID ANNIHILATION; DECAYS; RANGE AB The results of an investigation based on ALEPH data, e+ e- --> hadrons at square-root s = 91 GeV, into fluctuations in rapidity space are presented. It is found that the behaviour of the factorial moments is well represented by the Lund parton shower model. An estimate is made of the scale of fluctuations needed to describe the data. Differential moments are introduced and are used to demonstrate that within the average represented by the traditional factorial moments the pattern of fluctuations is itself a strong function of rapidity. This pattern is shown to be primarily associated with the emission of hard gluons. The implied structure between the hadron clusters and partons is explored by the use of transverse mass moments. It is concluded that the principal features of the one-dimensional factorial moments, differential moments and transverse mass moments have their origin in the O(alpha(s)) matrix element, kinematic boundaries and the method of selection of the event axis. C1 UNIV AUTONOMA BARCELONA,FIS ALTAS ENERGIAS LAB,E-08193 BARCELONA,SPAIN. CHINESE ACAD SCI,INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA. CERN,EUROPEAN LAB PARTICLE PHYS,CH-1211 GENEVA 23,SWITZERLAND. UNIV CLERMONT FERRAND,PHYS CORPUSCULAIRE LAB,CNRS,F-63177 CLERMONT FERRAND,FRANCE. NIELS BOHR INST,DK-2100 COPENHAGEN,DENMARK. DEMOCRITOS NUCL RES CTR,ATHENS,GREECE. ECOLE POLYTECH,PHYS NUCL & HAUTES ENERGIES LAB,CNRS,F-91128 PALAISEAU,FRANCE. UNIV EDINBURGH,DEPT PHYS,EDINBURGH EH9 3JZ,MIDLOTHIAN,SCOTLAND. FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306. FLORIDA STATE UNIV,SUPERCOMP COMPUTAT RES INST,TALLAHASSEE,FL 32306. IST NAZL FIS NUCL,NAZL LAB,I-00044 FRASCATI,ITALY. UNIV GLASGOW,DEPT PHYS & ASTRON,GLASGOW G12 8QQ,SCOTLAND. UNIV HEIDELBERG,INST HOCHENERGIEPHYS,W-6900 HEIDELBERG,GERMANY. UNIV LONDON IMPERIAL COLL SCI & TECHNOL,DEPT PHYS,LONDON SW7 2BZ,ENGLAND. UNIV INNSBRUCK,INST EXPTL PHYS,A-6020 INNSBRUCK,AUSTRIA. UNIV LANCASTER,DEPT PHYS,LANCASTER LA1 4YB,ENGLAND. UNIV MAINZ,INST PHYS,W-6500 MAINZ,GERMANY. FAC SCI LUMINY,CTR PHYS PARTICULES,CNRS,F-13288 MARSEILLE,FRANCE. MAX PLANCK INST PHYS & ASTROPHYS,WERNER HEISENBERG INST PHYS,W-8000 MUNICH 40,GERMANY. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,CNRS,F-91405 ORSAY,FRANCE. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. UNIV LONDON,ROYAL HOLLOWAY & BEDFORD NEW COLL,DEPT PHYS,SURREY TW20 OEX,ENGLAND. RUTHERFORD APPLETON LAB,DEPT PARTICLE PHYS,DIDCOT OX11 0QX,OXON,ENGLAND. CENS,DEPT PHYS PARTICULES ELEMENTAIRES,F-91191 GIF SUR YVETTE,FRANCE. UNIV SHEFFIELD,DEPT PHYS,SHEFFIELD S3 7RH,S YORKSHIRE,ENGLAND. UNIV SIEGEN,FACHBEREICH PHYS,W-5900 SIEGEN,GERMANY. UNIV TRIESTE,DIPARTMENTO FIS,I-34127 TRIESTE,ITALY. UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. UNIV TURIN,IST FIS GEN,I-10124 TURIN,ITALY. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. CERN,DIV PPE,CH-1211 GENEVA 23,SWITZERLAND. SLAC,STANFORD,CA 94309. UNIV WASHINGTON,SEATTLE,WA 98195. CNR,IST COSMO GEOFIS,TURIN,ITALY. IST NAZL FIS NUCL,SEZIONE BARI,BARI,ITALY. UNIV BARI,DIPARTMENTO FIS,I-70126 BARI,ITALY. UNIV FLORENCE,DIPARTMENTO FIS,IST NAZL FIS NUCL,SEZIONE FIRENZE,I-50125 FLORENCE,ITALY. UNIV PISA,DIPARTMENTO FIS,IST NAZL FIS NUCL,SEZIONE PISA,I-56100 PISA,ITALY. IST NAZL FIS NUCL,SEZIONE TRIESTE,I-34127 TRIESTE,ITALY. RP DECAMP, D (reprint author), CNRS,PHYS PARTICULES LAB,IN2P3,F-74019 ANNECY LE VIEUX,FRANCE. RI Fernandez, Enrique/L-5387-2014; ANTONELLI, ANTONELLA/C-6238-2011; Buttar, Craig/D-3706-2011; Stahl, Achim/E-8846-2011; Passalacqua, Luca/F-5127-2011; Forti, Francesco/H-3035-2011; Focardi, Ettore/E-7376-2012; Venturi, Andrea/J-1877-2012; Perrier, Frederic/A-5953-2011; Rolandi, Luigi (Gigi)/E-8563-2013; Colas, Paul/F-2876-2013; Delfino, Manuel/A-1545-2012; Bosman, Martine/J-9917-2014; Mir, Lluisa-Maria/G-7212-2015; ciocci, maria agnese /I-2153-2015; Lusiani, Alberto/N-2976-2015; Lusiani, Alberto/A-3329-2016; Murtas, Fabrizio/B-5729-2012; Booth, Christopher/B-5263-2016; Pacheco Pages, Andres/C-5353-2011; Ferrante, Isidoro/F-1017-2012; Ligabue, Franco/F-3432-2014; OI Fernandez, Enrique/0000-0002-6405-9488; Stahl, Achim/0000-0002-8369-7506; Forti, Francesco/0000-0001-6535-7965; Focardi, Ettore/0000-0002-3763-5267; Rolandi, Luigi (Gigi)/0000-0002-0635-274X; Delfino, Manuel/0000-0002-9468-4751; Bosman, Martine/0000-0002-7290-643X; Mir, Lluisa-Maria/0000-0002-4276-715X; ciocci, maria agnese /0000-0003-0002-5462; Lusiani, Alberto/0000-0002-6876-3288; Lusiani, Alberto/0000-0002-6876-3288; Booth, Christopher/0000-0002-6051-2847; Pacheco Pages, Andres/0000-0001-8210-1734; Ferrante, Isidoro/0000-0002-0083-7228; Palazzi, Paolo/0000-0002-4861-391X; RASO, Giuseppe/0000-0002-5660-3711; Bottigli, Ubaldo/0000-0002-0666-3433; Ligabue, Franco/0000-0002-1549-7107; Bloch-Devaux, Brigitte/0000-0002-2463-1232; Martinez Rodriguez, Manel/0000-0002-9763-9155; Murtas, Fabrizio/0000-0002-7041-6541; Garrido Beltran, Lluis/0000-0001-8883-6539; Edgecock, Rob/0000-0002-7896-3312 NR 17 TC 35 Z9 35 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. 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Fields PD JAN PY 1992 VL 53 IS 1 BP 21 EP 32 PG 12 WC Physics, Particles & Fields SC Physics GA HA667 UT WOS:A1992HA66700002 ER PT J AU ABREU, P ADAM, W ADAMI, F ADYE, T AKESSON, T ALEKSEEV, GD ALLEN, P ALMEHED, S ALTED, F ALVSVAAG, SJ AMALDI, U ANASSONTZIS, E ANTILOGUS, P APEL, WD ASMAN, B ASTIER, P AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARBIELLINI, G BARDIN, DY BARONCELLI, A BARRING, O BARTL, W BATES, MJ BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENLLOCH, JM BERGGREN, M BERTRAND, D BIAGI, S BIANCHI, F BIBBY, JH BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOGOLUBOV, PN BOLOGNESE, T BONAPART, M BONESINI, M BONIVENTO, W BOOTH, PSL BORATAV, M BORGEAUD, P BORISOV, G BORNER, H BOSIO, C BOTNER, O BOUQUET, B BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPAGNE, JE CAMPION, A CAMPORESI, T CANALE, V CAO, F CARROLL, L CASO, C CASTELLI, E GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHARPENTIER, P CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CIRIO, R COLLINS, MP CONTRERAS, JL CONTRI, R COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROSLAND, N CROZON, M MAESTRO, JC CZELLAR, S DAGORET, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUNCEY, PD DAVENPORT, M DAVID, P DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C DEFEZLASO, MDM DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DEFOIX, C DELIKARIS, D DELORME, S DELPIERRE, P DEMARIA, N DERKAOUI, J DICIACCIO, L DIJKSTRA, H DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DULINSKI, W DZHELYADIN, R EEK, LO EEROLA, PAM EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FALALEEV, V FASSOULIOTIS, D ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FOLEGATI, P FONTANELLI, F FORSBACH, H FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GAGO, JM GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GLITZA, KW GOKIELI, R GOLOVATYUK, VM CADENAS, JJGY GOOBAR, A GOPAL, G GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROS, MH GROSDIDIER, G GROSSETETE, B GUMENYUK, S GUY, J HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HARRIS, FJ HECK, BW HERBST, I HERNANDEZ, JJ HERQUET, P HERR, H HIETANEN, I HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HULTH, PO HULTQVIST, K HUSSON, D HYAMS, BD IOANNOU, P ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KANTARDJIAN, G KAPUSTA, F KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORATZINOS, M KORCYL, K KORYTOV, AV KORZEN, B KOSTUKHIN, V KOURKOUMELIS, C KREUZBERGER, T KROLIKOWSKI, J KRUENERMARQUIS, U KRUPINSKI, W KUCEWICZ, W KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEMMONNE, J LENZEN, G LEPELTIER, V LETESSIERSELVON, A LIKO, D LIEB, E LILLETHUN, E LINDGREN, J LIPNIACKA, A LIPPI, I LLOSA, R LOERSTAD, B LOKAJICEK, M LOKEN, JG AGUERA, MAL LOPEZFERNANDEZ, A LOS, M LOUKAS, D LOUNIS, A LOZANO, JJ LUCOCK, R LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MALTEZOS, A MALTEZOS, S MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MENICHETTI, E MERONI, C MEYER, WT MICHELOTTO, M MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MULLER, H MURRAY, WJ MYATT, G NARAGHI, F NAUKORZEN, U NAVARRIA, FL NEGRI, P NIELSEN, BS NIJJHAR, B NIKOLAENKO, V OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OURAOU, A PAIN, R PALKA, H PAPADOPOULOU, T PAPE, L PASSERI, A PEGORARO, M PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PIERRE, F PIMENTA, M PINGOT, O PINSENT, A POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A PYYTHIA, J RADOJICIC, D RAGAZZI, S RANGE, WH RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SALT, J SANCHEZ, E SANCHEZ, J SANNINO, M SCHAEFFER, M SCHNEIDER, H SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SIEGRIST, P SIMONETTI, S SIMONETTO, F SISSAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMITH, GR SMIRNOV, N SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R STUBENRAUCH, CJ SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TORTORA, L TRAINOR, MT TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURCHETTA, R TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, VA VALENTI, G VALLAZZA, E FERRER, JAV VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VANEIJNDHOVEN, N VANDERVELDE, C VARELA, J VAZ, P VEGNI, G VELASCO, J VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VIBERT, L VILANOVA, D VLASOV, EV VODOPYANOV, AS VOLLMER, M VOLPONI, S VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZITOUN, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J AF ABREU, P ADAM, W ADAMI, F ADYE, T AKESSON, T ALEKSEEV, GD ALLEN, P ALMEHED, S ALTED, F ALVSVAAG, SJ AMALDI, U ANASSONTZIS, E ANTILOGUS, P APEL, WD ASMAN, B ASTIER, P AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARBIELLINI, G BARDIN, DY BARONCELLI, A BARRING, O BARTL, W BATES, MJ BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENLLOCH, JM BERGGREN, M BERTRAND, D BIAGI, S BIANCHI, F BIBBY, JH BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOGOLUBOV, PN BOLOGNESE, T BONAPART, M BONESINI, M BONIVENTO, W BOOTH, PSL BORATAV, M BORGEAUD, P BORISOV, G BORNER, H BOSIO, C BOTNER, O BOUQUET, B BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPAGNE, JE CAMPION, A CAMPORESI, T CANALE, V CAO, F CARROLL, L CASO, C CASTELLI, E GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHARPENTIER, P CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CIRIO, R COLLINS, MP CONTRERAS, JL CONTRI, R COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROSLAND, N CROZON, M MAESTRO, JC CZELLAR, S DAGORET, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUNCEY, PD DAVENPORT, M DAVID, P DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C DEFEZLASO, MDM DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DEFOIX, C DELIKARIS, D DELORME, S DELPIERRE, P DEMARIA, N DERKAOUI, J DICIACCIO, L DIJKSTRA, H DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DULINSKI, W DZHELYADIN, R EEK, LO EEROLA, PAM EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FALALEEV, V FASSOULIOTIS, D ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FOLEGATI, P FONTANELLI, F FORSBACH, H FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GAGO, JM GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GLITZA, KW GOKIELI, R GOLOVATYUK, VM CADENAS, JJGY GOOBAR, A GOPAL, G GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROS, MH GROSDIDIER, G GROSSETETE, B GUMENYUK, S GUY, J HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HARRIS, FJ HECK, BW HERBST, I HERNANDEZ, JJ HERQUET, P HERR, H HIETANEN, I HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HULTH, PO HULTQVIST, K HUSSON, D HYAMS, BD IOANNOU, P ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KANTARDJIAN, G KAPUSTA, F KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORATZINOS, M KORCYL, K KORYTOV, AV KORZEN, B KOSTUKHIN, V KOURKOUMELIS, C KREUZBERGER, T KROLIKOWSKI, J KRUENERMARQUIS, U KRUPINSKI, W KUCEWICZ, W KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEMMONNE, J LENZEN, G LEPELTIER, V LETESSIERSELVON, A LIKO, D LIEB, E LILLETHUN, E LINDGREN, J LIPNIACKA, A LIPPI, I LLOSA, R LOERSTAD, B LOKAJICEK, M LOKEN, JG AGUERA, MAL LOPEZFERNANDEZ, A LOS, M LOUKAS, D LOUNIS, A LOZANO, JJ LUCOCK, R LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MALTEZOS, A MALTEZOS, S MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MENICHETTI, E MERONI, C MEYER, WT MICHELOTTO, M MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MULLER, H MURRAY, WJ MYATT, G NARAGHI, F NAUKORZEN, U NAVARRIA, FL NEGRI, P NIELSEN, BS NIJJHAR, B NIKOLAENKO, V OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OURAOU, A PAIN, R PALKA, H PAPADOPOULOU, T PAPE, L PASSERI, A PEGORARO, M PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PIERRE, F PIMENTA, M PINGOT, O PINSENT, A POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A PYYTHIA, J RADOJICIC, D RAGAZZI, S RANGE, WH RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SALT, J SANCHEZ, E SANCHEZ, J SANNINO, M SCHAEFFER, M SCHNEIDER, H SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SIEGRIST, P SIMONETTI, S SIMONETTO, F SISSAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMITH, GR SMIRNOV, N SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R STUBENRAUCH, CJ SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TORTORA, L TRAINOR, MT TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURCHETTA, R TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, VA VALENTI, G VALLAZZA, E FERRER, JAV VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VANEIJNDHOVEN, N VANDERVELDE, C VARELA, J VAZ, P VEGNI, G VELASCO, J VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VIBERT, L VILANOVA, D VLASOV, EV VODOPYANOV, AS VOLLMER, M VOLPONI, S VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZITOUN, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J TI SEARCH FOR EXCITED CHARGED LEPTONS IN Z0 DECAYS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID SIMULATION; ELECTRONS; LIMITS; MUONS; MASS; LEP; G-2 AB Using a data sample of 115000 hadronic Z0 decays, a search was performed for the production of excited charged leptons decaying into an ordinary lepton and one photon. Pair production of excited leptons of mass below 45 GeV/c2 is excluded. From an analysis of the lepton-photon mass spectra this experiment is also able to exclude single production of these particles for masses that reach up to 85 GeV/c2, if the compositeness scale is below 1 TeV. C1 UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. UNIV LIBRE BRUXELLES,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV ETAT MONS,FAC SCI,SERV PHYS PART ELEM,B-7000 MONS,BELGIUM. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. COLL FRANCE,PHYS CORPUSCULAIRE LAB,F-75231 PARIS 05,FRANCE. DELPHI,CRN GRP,DIV HAUTES ENERGIES,F-67037 STRASBOURG,FRANCE. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. JOINT INST NUCL RES,MOSCOW 101000,USSR. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE. LIP,P-1000 LISBON,PORTUGAL. 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UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV BOLOGNA,DIPARTMENTO FIS,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. CERN,CH-1211 GENEVA 23,SWITZERLAND. LEPSI,F-67037 STRASBOURG,FRANCE. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. UNIV HELSINKI,HIGH ENERGY PHYS RES INST,SF-00170 HELSINKI 17,FINLAND. UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE 1,GERMANY. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV PARIS 06,LPNHE,F-75230 PARIS 05,FRANCE. UNIV LYON 1,F-69622 VILLEURBANNE,FRANCE. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. UNIV PADUA,DIPARTMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,I-35131 PADUA,ITALY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. IST NAZL FIS NUCL,I-00173 ROME,ITALY. SERPUKHOV HIGH ENERGY PHYS INST,SERPUKHOV,USSR. UNIV STOCKHOLM,INST PHYS,S-11346 STOCKHOLM,SWEDEN. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. UNIV TRIESTE,DIPARTMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,I-34127 TRIESTE,ITALY. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. RP ABREU, P (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Varela, Joao/K-4829-2016; Rovelli, Tiziano/K-4432-2015; Fernandez-Alonso, Mercedes/F-2557-2016; Lozano-Bahilo, Julio/F-4881-2016; Olshevskiy, Alexander/I-1580-2016; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Zaitsev, Alexandre/B-8989-2017; Monge, Maria Roberta/G-9127-2012; Ridky, Jan/H-6184-2014; Zukanovich Funchal, Renata/C-5829-2013; Contreras Gonzalez, Jose Luis/K-7255-2014; Pimenta, Mario/M-1741-2013; Gomez Cadenas, Juan Jose/L-2003-2014; Ragazzi, Stefano/D-2463-2009; Roditi, Itzhak/O-7448-2014; Zuniga, Juan/P-4385-2014; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; de Groot, Nicolo/A-2675-2009; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Shellard, Ronald/G-4825-2012; Giacomelli, Paolo/B-8076-2009; Fruhwirth, Rudolf/H-2529-2012; Dracos, Marcos/K-2335-2012; Hallgren, Allan/A-8963-2013; Botner, Olga/A-9110-2013; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Vaz, Pedro/K-2464-2013 OI Lacasta, Carlos/0000-0002-2623-6252; DE MIN, ALBERTO/0000-0002-8130-9389; Demaria, Natale/0000-0003-0743-9465; Bonesini, Maurizio/0000-0001-5119-1896; Sannino, Mario/0000-0001-7700-8383; De Angelis, Alessandro/0000-0002-3288-2517; Varela, Joao/0000-0003-2613-3146; De Lotto, Barbara/0000-0003-3624-4480; Benlloch Baviera, Jose Maria/0000-0001-6073-1436; Tabarelli de Fatis, Tommaso/0000-0001-6262-4685; Rovelli, Tiziano/0000-0002-9746-4842; Fernandez-Alonso, Mercedes/0000-0002-1311-5275; Lozano-Bahilo, Julio/0000-0003-0613-140X; Olshevskiy, Alexander/0000-0002-8902-1793; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Zaitsev, Alexandre/0000-0002-4961-8368; Matteuzzi, Clara/0000-0002-4047-4521; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Zukanovich Funchal, Renata/0000-0001-6749-0022; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Pimenta, Mario/0000-0002-2590-0908; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Ragazzi, Stefano/0000-0001-8219-2074; Roditi, Itzhak/0000-0003-2363-5626; Zuniga, Juan/0000-0002-1041-6451; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Ruiz, Alberto/0000-0002-3639-0368; Shellard, Ronald/0000-0002-2983-1815; Dracos, Marcos/0000-0003-0514-193X; Vaz, Pedro/0000-0002-7186-2359 NR 19 TC 24 Z9 24 U1 0 U2 8 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JAN PY 1992 VL 53 IS 1 BP 41 EP 49 PG 9 WC Physics, Particles & Fields SC Physics GA HA667 UT WOS:A1992HA66700004 ER PT J AU OLTMAN, E AUCHINCLOSS, P BLAIR, RE HABER, C MISHRA, SR RUIZ, M SCIULLI, FJ SHAEVITZ, MH SMITH, WH MERRITT, FS OREGLIA, MJ REUTENS, PG COLEMAN, R FIS, HE LEVINTHAL, D MARSH, W RAPIDIS, PA WHITE, HB YOVANOVITCH, D BODEK, A BORCHERDING, F GIOKARIS, N LANG, K STOCKDALE, IE AF OLTMAN, E AUCHINCLOSS, P BLAIR, RE HABER, C MISHRA, SR RUIZ, M SCIULLI, FJ SHAEVITZ, MH SMITH, WH MERRITT, FS OREGLIA, MJ REUTENS, PG COLEMAN, R FIS, HE LEVINTHAL, D MARSH, W RAPIDIS, PA WHITE, HB YOVANOVITCH, D BODEK, A BORCHERDING, F GIOKARIS, N LANG, K STOCKDALE, IE TI NUCLEON STRUCTURE FUNCTIONS FROM HIGH-ENERGY NEUTRINO INTERACTIONS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID STRUCTURE-FUNCTION F2(X,Q2); FREE GAUGE THEORIES; SCALING VIOLATIONS; MODERATE ENERGIES; MUON SCATTERING; COLOR DYNAMICS; HIGH Q2; QCD; DIMUONS; IRON AB Structure functions obtained from high energy neutrino and antineutrino scattering from an iron target are presented. These were extracted from the combined data of Fermilab experiments E616 and E701; these utilized narrow band beam runs between 1979-1982. The structure functions are used to test the validity of quark-parton model (QPM) predictions and to extract the QCD scale parameter-LAMBDA from fits to the Altarelli-Parisi equations. C1 COLUMBIA UNIV,NEW YORK,NY 10027. UNIV CHICAGO,CHICAGO,IL 60637. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV ROCHESTER,ROCHESTER,NY 14627. NR 33 TC 48 Z9 48 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JAN PY 1992 VL 53 IS 1 BP 51 EP 71 DI 10.1007/BF01483872 PG 21 WC Physics, Particles & Fields SC Physics GA HA667 UT WOS:A1992HA66700005 ER PT J AU BURROWS, PN DELDUCA, V HOYER, P AF BURROWS, PN DELDUCA, V HOYER, P TI HEAVY QUARK CORRELATIONS IN E+E- ANNIHILATIONS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID SOFT GLUON INTERFERENCE; LUND MONTE-CARLO; PERTURBATION-THEORY; JET FRAGMENTATION; 3-JET EVENTS; Z0 RESONANCE; ALPHA-S; QCD; MODELS; FACTORIZATION AB In heavy quark jets the quark mass acts as a regulator of collinear singularities, making the quark momentum an infra-red safe variable in perturbative QCD. This allows a direct comparison of measured heavy hadron momentum spectra with perturbative calculations. We exploit the factorisation of heavy quark fragmentation to derive QCD predictions for momentum correlations between heavy hadrons produced in e+e-annihilations. We study the practical feasibility and model sensitivity of our approach using Monte Carlo simulations. Higher order perturbative corrections and contributions from non-perturbative effects are found to be at the level of 10%. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. UNIV HELSINKI,DEPT HIGH ENERGY PHYS,SF-00100 HELSINKI 10,FINLAND. RP BURROWS, PN (reprint author), MIT,CAMBRIDGE,MA 02139, USA. NR 48 TC 3 Z9 3 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD JAN PY 1992 VL 53 IS 1 BP 149 EP 155 DI 10.1007/BF01483883 PG 7 WC Physics, Particles & Fields SC Physics GA HA667 UT WOS:A1992HA66700016 ER PT J AU TRAJMAR, S RATLIFF, JM CSANAK, G CARTWRIGHT, DC AF TRAJMAR, S RATLIFF, JM CSANAK, G CARTWRIGHT, DC TI PROPOSED STANDARD INELASTIC DIFFERENTIAL ELECTRON-SCATTERING CROSS-SECTIONS - EXCITATION OF THE 21P LEVEL IN HE SO ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS LA English DT Article ID ANGULAR-CORRELATION PARAMETERS; DISTORTED-WAVE APPROXIMATION; IMPACT EXCITATION; INTERMEDIATE ENERGIES; ELASTIC-SCATTERING; POLARIZATION FRACTIONS; HELIUM SCATTERING; ATOM SCATTERING; STATES AB Differential and integral cross section data for electron-impact excitation of the 2(1)P level in He have been critically reviewed. Experimental and theoretical results have been compared and a set of differential cross sections at 20-degrees scattering angle in the 25 to 500 eV impact energy range has been deduced based on all available information. It is proposed that this set of data represents the most accurate inelastic differential cross sections available at the present time and could be used as a secondary standard for normalization of cross sections. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP TRAJMAR, S (reprint author), CALTECH,JET PROP LAB,PASADENA,CA 91109, USA. NR 43 TC 22 Z9 22 U1 2 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0178-7683 J9 Z PHYS D ATOM MOL CL JI Z. Phys. D-Atoms Mol. Clusters PD JAN PY 1992 VL 22 IS 2 BP 457 EP 462 PG 6 WC Physics, Atomic, Molecular & Chemical SC Physics GA GY771 UT WOS:A1992GY77100003 ER PT J AU RICHARDSON, JW VOGT, ETC AF RICHARDSON, JW VOGT, ETC TI STRUCTURE DETERMINATION AND RIETVELD REFINEMENT OF ALUMINOPHOSPHATE MOLECULAR-SIEVE ALPO4-8 SO ZEOLITES LA English DT Article DE ALUMINOPHOSPHATE; ULTRAWIDE PORE; VPI-5; AIPO4-8; NEUTRON DIFFRACTION; X-RAY DIFFRACTION; STRUCTURE ID NEUTRON POWDER DIFFRACTION; FRAMEWORK TOPOLOGY; VPI-5; TRANSITION; CHANNELS; NETS AB The 18-ring pore molecular sieve VPI-5 recrystallizes to the 14-ring sieve AIPO4-8. This recrystallization appears to be reversible under proper conditions, as could be explained on the basis of the structural relationship between the two materials. VPI-5 has an 18-ring channel bounded by six 6-rings and six pairs of adjoining 4-rings. In the conversion to AIPO4-8, two-thirds of the adjoining 4-rings are converted to 6-rings and reconnected to form a smaller, 14-ring channel bounded by eight 6-rings, two pairs of adjoining 4-rings, and two single 4-rings. The space group for AIPO4-8 [Cmc2(1): a = 33.0894(25), b = 14.6832(13), c = 8.3630(6) angstrom at room temperature] is a direct subgroup of that for VPI-5 [P6(3)cm: a = 18.549(l), c = 8.404(1) angstrom for the dehydrated form; orthohexagonal setting: a = 32.128, b = 18.549, c = 8.404 angstrom]. Interconversion of the two structures may be facilitated by extracoordination of framework aluminum atoms with water molecules. The observed small adsorption capacity of AIPO4-8 can be explained by stacking faults, where, within a single channel, different pairs of adjoining 4-rings are left unbroken. C1 UNIV CHICAGO,CHICAGO,IL 60637. AKZO CHEM NEDERLAND BV,RES CTR AMSTERDAM,AMSTERDAM,NETHERLANDS. RP RICHARDSON, JW (reprint author), ARGONNE NATL LAB,DIV IPNS,9700 S CASS AVE,ARGONNE,IL 60637, USA. RI Vogt, Eelco/F-2991-2015 OI Vogt, Eelco/0000-0003-4556-4283 NR 31 TC 54 Z9 56 U1 0 U2 2 PU BUTTERWORTH-HEINEMANN PI WOBURN PA 225 WILDWOOD AVE #UNITB PO BOX 4500, WOBURN, MA 01801-2084 SN 0144-2449 J9 ZEOLITES JI Zeolites PD JAN PY 1992 VL 12 IS 1 BP 13 EP 19 DI 10.1016/0144-2449(92)90003-8 PG 7 WC Chemistry, Physical SC Chemistry GA GX776 UT WOS:A1992GX77600003 ER PT J AU CHASON, E BEDROSSIAN, P HOUSTON, JE TSAO, JY DODSON, BW PICRAUX, ST AF CHASON, E BEDROSSIAN, P HOUSTON, JE TSAO, JY DODSON, BW PICRAUX, ST TI SIMULATIONS OF LAYER-BY-LAYER SPUTTERING DURING EPITAXY SO APPLIED PHYSICS LETTERS LA English DT Article ID BEAM AB We have performed computer simulations of simultaneous and sequential ion bombardment and epitaxial growth. In agreement with recent reflection high-energy electron diffraction (RHEED) measurements on Si, we observe ion-induced RHEED oscillations, a cancellation of RHEED oscillations during simultaneous equal-rate ion bombardment and growth, and a reversal of growth-induced roughening by subsequent ion bombardment. Comparison between simulations and measurements indicate that a model of the ion/surface interaction characterized by the creation of mobile vacancies with minimal preferential sputtering is sufficient to simulate all the RHEED measurements. RP CHASON, E (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 5 TC 13 Z9 13 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD DEC 30 PY 1991 VL 59 IS 27 BP 3533 EP 3535 DI 10.1063/1.105648 PG 3 WC Physics, Applied SC Physics GA GX159 UT WOS:A1991GX15900009 ER PT J AU INOUE, T OHSUNA, T LUO, L WU, XD MAGGIORE, CJ YAMAMOTO, Y SAKURAI, Y CHANG, JH AF INOUE, T OHSUNA, T LUO, L WU, XD MAGGIORE, CJ YAMAMOTO, Y SAKURAI, Y CHANG, JH TI GROWTH OF (110)-ORIENTED CEO2 LAYERS ON (100) SILICON SUBSTRATES SO APPLIED PHYSICS LETTERS LA English DT Article ID EPITAXIAL-GROWTH; SI AB CeO2 layers epitaxially grown on (100) silicon substrates by electron-beam evaporation were investigated and proved to have (110) orientation. X-ray diffraction measurements showed the CeO2 layers consist of more than 98% volume fraction of the (110) component. Cross-sectional high-resolution transmission electron microscopy and selected-area electron diffraction clearly verified the above configuration of crystallographic orientations and that the <100> direction in the CeO2 (110) plane is parallel with the <110> direction in the Si(100) plane. The cross-sectional lattice image clarified the existence of a approximately 60-angstrom-thick intermediate amorphous layer between the CeO2 layer and the silicon substrate. Moreover, the high density of defects such as dislocations and low-angle boundaries that exist in the vicinity of the interface agree well with Rutherford backscattering and channeling measurements. C1 NATL TAIWAN UNIV,DEPT PHYS,TAIPEI,TAIWAN. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. HOSEI UNIV,ION BEAM TECHNOL RES CTR,KOGANEI,TOKYO 184,JAPAN. RP INOUE, T (reprint author), IWAKI MEISEI UNIV,COLL SCI & ENGN,DEPT ELECTR ENGN,5-5-1 IINO CHUODA,IWAKI,FUKUSHIMA 970,JAPAN. NR 10 TC 111 Z9 115 U1 3 U2 8 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 DEC 30 PY 1991 VL 59 IS 27 BP 3604 EP 3606 DI 10.1063/1.105646 PG 3 WC Physics, Applied SC Physics GA GX159 UT WOS:A1991GX15900033 ER PT J AU POLONKA, J XU, M LI, Q GOLDMAN, AI FINNEMORE, DK AF POLONKA, J XU, M LI, Q GOLDMAN, AI FINNEMORE, DK TI INSITU X-RAY-INVESTIGATION OF THE MELTING OF BI-SR-CA-CU-O PHASES SO APPLIED PHYSICS LETTERS LA English DT Article AB High-temperature x-ray studies of the melting of Bi2Sr2Ca1Cu2O8-delta/Ag composites have been undertaken in order to determine the factors that control the melting temperature and the various phases that form during the melt-processing part of the fabrication of these conductors. During the melting process, three distinct phases form and then dissolve in the Bi-rich liquid: first (Sr,Ca)1Cu1O2, then (Sr,Ca)2Cu1O3, and finally (Sr,Ca)O. Ag suppresses the melting point about 30-degrees-C and as much as 10% Ag can dissolve in the Bi-rich liquid. A slight Bi excess also decreases the temperature where the Bi2Sr2Ca1Cu2O8-delta structure disappears and liquid forms. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP POLONKA, J (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 8 TC 77 Z9 80 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 DEC 30 PY 1991 VL 59 IS 27 BP 3640 EP 3642 DI 10.1063/1.105605 PG 3 WC Physics, Applied SC Physics GA GX159 UT WOS:A1991GX15900045 ER PT J AU GIBSON, JK AF GIBSON, JK TI SYNTHESIS AND MASS-SPECTROMETRY OF HALIDE AND OXIDE HALIDE (F AND CL) VAPOR SPECIES OF TECHNETIUM, TANTALUM AND TUNGSTEN SO JOURNAL OF FLUORINE CHEMISTRY LA English DT Article AB Transition metal solids have been exposed to fluorine, chlorine trifluoride and/or oxygen at temperatures up to 800-degrees-C, and the volatile reaction products analyzed by mass spectrometry. Reported here are the results of the reactions of the metals (sometimes partially oxidized) technetium, rhenium, tantalum and tungsten. The following vapor species have been identified: TcF5, TcO3F, TcOF4, TcO2F3, TcO3Cl, TcOCl3, TCO2Cl(x) (x = 2 or 3), TcOF2Cl, TcOFCl2, ReF6, ReO3F, ReO2F3, ReOF4, WF6, WO2F2, WOF4, WO2Cl2, WF5Cl, TaF5, TaOF3, TaOCl3 and TaF(x)Cl5-x (x = 1-4). The conditions under which these species were formed and their relevance to conventional condensed phase chemistry are discussed. RP GIBSON, JK (reprint author), OAK RIDGE NATL LAB,DIV CHEM,POB 2008,OAK RIDGE,TN 37831, USA. NR 22 TC 15 Z9 15 U1 1 U2 6 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-1139 J9 J FLUORINE CHEM JI J. Fluor. Chem. PD DEC 30 PY 1991 VL 55 IS 3 BP 299 EP 311 DI 10.1016/S0022-1139(00)82358-1 PG 13 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA HM826 UT WOS:A1991HM82600009 ER PT J AU HSUEH, CH AF HSUEH, CH TI INTERFACIAL DEBONDING AND FIBER PULL-OUT STRESSES OF FIBER-REINFORCED COMPOSITES .5. WITH A VISCOUS INTERFACE SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID MATRIX COMPOSITES; SILICON-NITRIDE; BOND STRENGTH; MICROSTRUCTURE; CERAMICS; CARBIDE AB A fiber-reinforced elastic composite with a viscous interface is considered. The time-dependent fiber pull-out behavior is analyzed for various boundary conditions at the loaded end and the embedded end of the fiber. Specifically, loading conditions of constant stress and constant displacement rate are considered. With these loading conditions, fiber pull-out is analyzed for several conditions at the embedded end of the fiber; the embedded end is free, fixed or spring like. The time dependence of the distributions of the stress and the displacement rate in the fiber are analyzed. The parameters, which control the time-dependent behavior and the steady state condition, are addressed. RP HSUEH, CH (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. RI Hsueh, Chun-Hway/G-1345-2011 NR 19 TC 2 Z9 2 U1 2 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD DEC 30 PY 1991 VL 149 IS 1 BP 1 EP 9 DI 10.1016/0921-5093(91)90780-Q PG 9 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA GZ296 UT WOS:A1991GZ29600001 ER PT J AU HSUEH, CH AF HSUEH, CH TI INTERFACIAL DEBONDING AND FIBER PULL-OUT STRESSES OF FIBER-REINFORCED COMPOSITES .6. INTERPRETATION OF FIBER PULL-OUT CURVES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID SHEAR; STRENGTH; FRICTION AB The stress-displacement relationship of the fiber during the fiber pull-out process in a fiber-reinforced composite (i.e. the fiber pull-out curve) is considered. Understanding of both interfacial debonding and friction at the debonded interface is essential in interpreting the fiber pull-out curve. The behavior of interfacial debonding, which can be unstable, partially stable or stable, is characterized in the present study. The debonded interface can be either subjected to Coulomb friction, or free of friction which is contingent upon the comparison between the residual clamping stress and the interfacial radial tension induced by Poisson's contraction of the axially tensile-loaded fiber. The important parameters controlling the characteristics of interfacial debonding and friction are studied, and various fiber pull-out curves are elucidated. RP HSUEH, CH (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. RI Hsueh, Chun-Hway/G-1345-2011 NR 18 TC 6 Z9 6 U1 2 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD DEC 30 PY 1991 VL 149 IS 1 BP 11 EP 18 DI 10.1016/0921-5093(91)90781-H PG 8 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA GZ296 UT WOS:A1991GZ29600002 ER PT J AU GARRISON, WM BROOKS, JA AF GARRISON, WM BROOKS, JA TI THE THERMAL AND MECHANICAL STABILITY OF AUSTENITE IN THE LOW-CARBON MARTENSITIC STEEL PH-13-8 SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID EMBRITTLEMENT AB PH 13-8Mo (registered trademark of the Armco Steel Corporation) is a martensitic stainless steel of low carbon content which is strengthened on aging by precipitation of the intermetallic beta-NiAl. This alloy exhibits an embrittlement coincident with precipitation hardening. One possible cause of or contributor to this embrittlement could be decomposition of retained austenite or changes in the mechanical stability of the austenite in the structure. The purpose of this work was to determine the amount and mechanical stability of austenite in PH 13-8 as a function of aging temperature and time and to assess the extent to which decomposition of retained austenite and/or changes in its mechanical stability could be associated with the embrittlement of this alloy on aging. C1 SANDIA NATL LABS,LIVERMORE,CA 94550. RP GARRISON, WM (reprint author), CARNEGIE MELLON UNIV,DEPT MET ENGN & MAT SCI,PITTSBURGH,PA 15213, USA. NR 26 TC 13 Z9 14 U1 0 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD DEC 30 PY 1991 VL 149 IS 1 BP 65 EP 72 DI 10.1016/0921-5093(91)90787-N PG 8 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA GZ296 UT WOS:A1991GZ29600008 ER PT J AU Baez, JC Bishop, AR Dandoloff, R AF Baez, John C. Bishop, Alan R. Dandoloff, Rossen TI ON THE HOPF TERM IN A TWO-DIMENSIONAL sigma MODEL FOR ANTIFERROMAGNETS SO MODERN PHYSICS LETTERS B LA English DT Article AB We discuss the possible topological terms in (2 + 1)d sigma models for antiferromagnets and point out errors in some of the 'proofs' of the nonexistence of the Hopf term. C1 [Baez, John C.] Univ Calif Riverside, Dept Math & Comp Sci, Riverside, CA 92521 USA. [Bishop, Alan R.; Dandoloff, Rossen] Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. [Bishop, Alan R.; Dandoloff, Rossen] Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Baez, JC (reprint author), Univ Calif Riverside, Dept Math & Comp Sci, Riverside, CA 92521 USA. NR 6 TC 4 Z9 4 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0217-9849 J9 MOD PHYS LETT B JI Mod. Phys. Lett. B PD DEC 30 PY 1991 VL 5 IS 30 BP 2003 EP 2005 DI 10.1142/S0217984991002410 PG 3 WC Physics, Applied; Physics, Condensed Matter; Physics, Mathematical SC Physics GA V28ED UT WOS:000208663200007 ER PT J AU ABREU, P ADAM, W ADAMI, F ADYE, T AKESSON, T ALEKSEEV, GD ALLEN, P ALMEHED, S ALTED, F ALVSVAAG, SJ AMALDI, U ANASSONTZIS, E ANTILOGUS, P APEL, WD APSIMON, RJ ASMAN, B ASTIER, P AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARBIELLINI, G BARDIN, DY BARONCELLI, A BARRING, O BARTL, W BATTAGLIA, M BATES, MJ BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENLLOCH, JM BERGGREN, M BERTRAND, D BIAGI, S BIANCHI, F BIBBY, JH BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOGOLUBOV, PN BOLOGNESE, T BONAPART, M BONESINI, M BONIVENTO, W BOOTH, PSL BORATAV, M BORGEAUD, P BORISOV, G BORNER, H BOSIO, C BOTNER, O BOUQUET, B BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPAGNE, JE CAMPION, A CAMPORESI, T CANALE, V CAO, F CARROLL, L CASO, C CASTELLI, E GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHAPKIN, M CHARPENTIER, P CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CIRIO, R CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROSLAND, N CROZON, M MAESTRO, JC CZELLAR, S DAGORET, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUNCEY, PD DAVENPORT, M DAVID, P DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DEFOIX, C DELIKARIS, D DELORME, S DELPIERRE, P DEMARIA, N DERKAOUI, J DICIACCIO, L DIJKSTRA, H DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DULINSKI, W DZHELYADIN, R EEK, LO EEROLA, PAM EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FOLEGATI, P FONTANELLI, F FORSBACH, H FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GAGO, JM GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GLITZA, KW GOKIELI, R GOLOVATYUK, VM CADENAS, JJGY GOOBAR, A GOPAL, G GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROS, MH GROSDIDIER, G GROSSETETE, B GUMENYUK, S GUY, J HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HARRIS, FJ HECK, BW HERBST, I HERNANDEZ, JJ HERQUET, P HERR, H HIETANEN, I HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HULTH, PO HULTQVIST, K HUSSON, D HYAMS, BD IOANNOU, P ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KANTARDJIAN, G KAPUSTA, F KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORATZINOS, M KORCYL, K KORYTOV, AV KORZEN, B KOSTUKHIN, V KOURKOUMELIS, C KREUZBERGER, T KROLIKOWSKI, J KRUENERMARQUIS, U KRUPINSKI, W KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEMONNE, J LENZEN, G LEPELTIER, V LETESSIERSELVON, A LIKO, D LIEB, E LILLETHUN, E LINDGREN, J LIPNIACKA, A LIPPI, I LLOSA, R LOERSTAD, B LOKAJICEK, M LOKEN, JG AGUERA, MAL LOPEZFERNANDEZ, A LOS, M LOUKAS, D LOUNIS, A LOZANO, JJ LUCOCK, R LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MALTEZOS, A MALTEZOS, S MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MENICHETTI, E MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MULLER, H MURRAY, WJ MUYATT, G NARAGHI, F NAUKORZEN, U NAVARRIA, FL NEGRI, P NIELSEN, BS NIJJHAR, B NIKOLAENKO, V OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OURAOU, A PAIN, R PALKA, H PAPADOPOULOU, T PAPE, L PASSERI, A PEGORARO, M PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PIERRE, F PIMENTA, M PINGOT, O PINSENT, A POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A PYYHTIA, J RADOJICIC, D RAGAZZI, S RANGE, WH RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SALT, J SANCHEZ, E SANCHEZ, J SANNINO, M SCHAEFFER, M SCHAEL, S SCHNEIDER, H SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SIEGRIST, P SIMONETTI, S SIMONETTO, F SISSAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMITH, GR SMIRNOV, N SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R STUBENRAUCH, CJ SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TORTORA, L TRAINOR, MT TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURCHETTA, R TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, VA VALENTI, G VALLAZZA, E FERRER, JAV VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VANEIJNDHOVEN, N VANDERVELDE, C VARELA, J VAZ, P VEGNI, G VELASCO, J VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VIBERT, L VILANOVA, D VLASOV, EV VODOPYANOV, AS VOLLMER, M VOLPONI, S VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZITOUN, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J AF ABREU, P ADAM, W ADAMI, F ADYE, T AKESSON, T ALEKSEEV, GD ALLEN, P ALMEHED, S ALTED, F ALVSVAAG, SJ AMALDI, U ANASSONTZIS, E ANTILOGUS, P APEL, WD APSIMON, RJ ASMAN, B ASTIER, P AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARBIELLINI, G BARDIN, DY BARONCELLI, A BARRING, O BARTL, W BATTAGLIA, M BATES, MJ BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENLLOCH, JM BERGGREN, M BERTRAND, D BIAGI, S BIANCHI, F BIBBY, JH BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOGOLUBOV, PN BOLOGNESE, T BONAPART, M BONESINI, M BONIVENTO, W BOOTH, PSL BORATAV, M BORGEAUD, P BORISOV, G BORNER, H BOSIO, C BOTNER, O BOUQUET, B BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPAGNE, JE CAMPION, A CAMPORESI, T CANALE, V CAO, F CARROLL, L CASO, C CASTELLI, E GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHAPKIN, M CHARPENTIER, P CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CIRIO, R CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROSLAND, N CROZON, M MAESTRO, JC CZELLAR, S DAGORET, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUNCEY, PD DAVENPORT, M DAVID, P DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DEFOIX, C DELIKARIS, D DELORME, S DELPIERRE, P DEMARIA, N DERKAOUI, J DICIACCIO, L DIJKSTRA, H DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DULINSKI, W DZHELYADIN, R EEK, LO EEROLA, PAM EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FOLEGATI, P FONTANELLI, F FORSBACH, H FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GAGO, JM GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GLITZA, KW GOKIELI, R GOLOVATYUK, VM CADENAS, JJGY GOOBAR, A GOPAL, G GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROS, MH GROSDIDIER, G GROSSETETE, B GUMENYUK, S GUY, J HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HARRIS, FJ HECK, BW HERBST, I HERNANDEZ, JJ HERQUET, P HERR, H HIETANEN, I HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HULTH, PO HULTQVIST, K HUSSON, D HYAMS, BD IOANNOU, P ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KANTARDJIAN, G KAPUSTA, F KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORATZINOS, M KORCYL, K KORYTOV, AV KORZEN, B KOSTUKHIN, V KOURKOUMELIS, C KREUZBERGER, T KROLIKOWSKI, J KRUENERMARQUIS, U KRUPINSKI, W KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEMONNE, J LENZEN, G LEPELTIER, V LETESSIERSELVON, A LIKO, D LIEB, E LILLETHUN, E LINDGREN, J LIPNIACKA, A LIPPI, I LLOSA, R LOERSTAD, B LOKAJICEK, M LOKEN, JG AGUERA, MAL LOPEZFERNANDEZ, A LOS, M LOUKAS, D LOUNIS, A LOZANO, JJ LUCOCK, R LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MALTEZOS, A MALTEZOS, S MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MENICHETTI, E MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MULLER, H MURRAY, WJ MUYATT, G NARAGHI, F NAUKORZEN, U NAVARRIA, FL NEGRI, P NIELSEN, BS NIJJHAR, B NIKOLAENKO, V OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OURAOU, A PAIN, R PALKA, H PAPADOPOULOU, T PAPE, L PASSERI, A PEGORARO, M PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PIERRE, F PIMENTA, M PINGOT, O PINSENT, A POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A PYYHTIA, J RADOJICIC, D RAGAZZI, S RANGE, WH RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SALT, J SANCHEZ, E SANCHEZ, J SANNINO, M SCHAEFFER, M SCHAEL, S SCHNEIDER, H SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SIEGRIST, P SIMONETTI, S SIMONETTO, F SISSAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMITH, GR SMIRNOV, N SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRUB, R STUBENRAUCH, CJ SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TORTORA, L TRAINOR, MT TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURCHETTA, R TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, VA VALENTI, G VALLAZZA, E FERRER, JAV VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VANEIJNDHOVEN, N VANDERVELDE, C VARELA, J VAZ, P VEGNI, G VELASCO, J VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VIBERT, L VILANOVA, D VLASOV, EV VODOPYANOV, AS VOLLMER, M VOLPONI, S VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZITOUN, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J TI DETERMINATION OF Z0 RESONANCE PARAMETERS AND COUPLINGS FROM ITS HADRONIC AND LEPTONIC DECAYS SO NUCLEAR PHYSICS B LA English DT Article ID ONE-LOOP CORRECTIONS; LUND MONTE-CARLO; RADIATIVE-CORRECTIONS; BHABHA SCATTERING; PHOTON CORRECTIONS; JET FRAGMENTATION; HIGH-ENERGIES; E+E-PHYSICS; ANNIHILATION; BOSON AB From measurements of the cross sections for e+ e - --> hadrons and the cross sections and forward-backward charge-asymmetries for e+ e- --> e+ e-, mu+ mu- and tau+ tau- at several centre-of-mass energies around the Z0 pole with the DELPHI apparatus, using approximately 150000 hadronic and leptonic events from 1989 and 1990, one determines the following Z0 parameters: the mass and total width M(Z) = 91.177 +/- 0.022 GeV, GAMMA(Z) = 2.465 +/- 0.020 GeV, the hadronic and leptonic partial widths GAMMA(h) = 1.726 +/- 0.019 GeV, GAMMA(t) = 83.4 +/- 0.8 MeV, the invisible width GAMMA(inv) = 488 +/- 17 MeV, the ratio of hadronic over leptonic partial widths R(Z)z = 20.70 +/- 0.29 and the Born level hadronic peak cross section sigma-0 = 41.84 +/- 0.45 nb. A flavour-independent measurement of the leptonic cross section gives very consistent results to those presented above (GAMMA(t) = 83.7 +/- 0.8 MeV). From these results the number of light neutrino species is determined to be N(nu) = 2.94 +/0. 10. The individual leptonic widths obtained are: GAMMA(e) = 82.4 +/- 1.2 MeV, GAMMA(mu) = 86.9 +/- 2.1 MeV and GAMMA(tau) = 82.7 +/- 2.4 MeV. Assuming universality, the squared vector and axial-vector couplings of the Z0 to charged leptons are: VBAR(t)2 = 0.0003 +/- 0.0010 and ABAR(l)2 = 0.2508 +/- 0.0027. These values correspond to the electroweak parameters: rho(eff) = 1.003 +/- 0.011 and sin2-theta(W)eff = 0.241 +/- 0.009. Within the Minimal Standard Model (MSM), the results can be expressed in terms of a single parameter: sin2-theta(W)MSBAR = 0.2338 +/- 0.0027. All these values are in good agreement with the predictions of the MSM. Fits yield 43 < m(top) < 215 GeV at the 95% level. Finally, the measured values of GAMMA(Z) and GAMMA(inv), are used to derive lower mass bounds for possible new particles. C1 AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. CENS,F-91191 GIF SUR YVETTE,FRANCE. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV LUND,DEPT PHYS,S-22363 LUND,SWEDEN. JOINT INST NUCL RES,MOSCOW 101000,USSR. UNIV VALENCIA,SCIC,CTR MIXTO,INST FIS CORPUSCULAR,E-46100 BURJASSOT,SPAIN. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV LYON 1,F-69622 VILLEURBANNE,FRANCE. FAC SCI OUJDA,DEPT PHYS,OUJDA,MOROCCO. UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE 1,GERMANY. UNIV STOCKHOLM,INST PHYS,S-11346 STOCKHOLM,SWEDEN. UNIV PARIS 06,LPNHE,F-75230 PARIS 05,FRANCE. UNIV PARIS 07,F-75230 PARIS 05,FRANCE. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE. UNIV TRIESTE,DIPARTMENTO FIS,I-34127 TRIESTE,ITALY. IST NACL FIZ NUCL,I-34127 TRIESTE,ITALY. UNIV UDINE,I-33100 UDINE,ITALY. IST SUPER SANITA,IST NAZL FIS NUCL,I-00161 ROME,ITALY. UNIV MILAN,DIPARTMENTO FIS,I-20122 MILAN,ITALY. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. UNIV OXFORD,NUCL PHYS LAB,OXFORD OX1 3RH,ENGLAND. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. COLL FRANCE,PHYS CORPUSCULAIRE LAB,F-75231 PARIS 05,FRANCE. INST HIGH ENERGY PHYS,SERPUKHOV 142284,USSR. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. UNIV ETAT MONS,FAC SCI,SERV PHYS PARTICULES ELEMENTAIRES,B-7000 MONS,BELGIUM. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. NATL INST NUCL PHYS & HIGH ENERGY PHYS,1009 DB AMSTERDAM,NETHERLANDS. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV PADUA,DIPARTMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,I-35131 PADUA,ITALY. UNIV HELSINKI,HIGH ENERGY PHYS RES INST,SF-00170 HELSINKI 17,FINLAND. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV SANTANDER,FAC CIENCIAS,E-39005 SANTANDER,SPAIN. UNIV ROME 2,DIPARTIMENTO FIS,I-00173 ROME,ITALY. IST NAZL FIS NUCL,I-00173 ROME,ITALY. UNIV BOLOGNA,DIPARTMENTO FIS,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. UNIV COMPLUTENSE MADRID,DEPT FIS ATOM MOLEC & NUCL,E-28040 MADRID,SPAIN. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. UNIV AIX MARSEILLE 2,FAC SCI LUMINY,F-13288 MARSEILLE 09,FRANCE. NATL RES CTR SCI DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. CTR RECH NUCL,DIV HAUTES ENERGIES,GRP DELPHI,F-67037 STRASBOURG,FRANCE. LEPSI,F-67037 STRASBOURG,FRANCE. VRIJE UNIV BRUSSELS,IIHE,B-1050 BRUSSELS,BELGIUM. RP ABREU, P (reprint author), LIP,AV ELIAS GARCIA 14-LE,P-1000 LISBON,PORTUGAL. RI Monge, Maria Roberta/G-9127-2012; Ridky, Jan/H-6184-2014; Zukanovich Funchal, Renata/C-5829-2013; Contreras Gonzalez, Jose Luis/K-7255-2014; Pimenta, Mario/M-1741-2013; Gomez Cadenas, Juan Jose/L-2003-2014; Ragazzi, Stefano/D-2463-2009; Roditi, Itzhak/O-7448-2014; Zuniga, Juan/P-4385-2014; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Vaz, Pedro/K-2464-2013; de Groot, Nicolo/A-2675-2009; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Shellard, Ronald/G-4825-2012; Giacomelli, Paolo/B-8076-2009; Fruhwirth, Rudolf/H-2529-2012; Dracos, Marcos/K-2335-2012; Hallgren, Allan/A-8963-2013; Botner, Olga/A-9110-2013; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Rovelli, Tiziano/K-4432-2015; Fernandez-Alonso, Mercedes/F-2557-2016; Lozano-Bahilo, Julio/F-4881-2016; Olshevskiy, Alexander/I-1580-2016; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Zaitsev, Alexandre/B-8989-2017; OI Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Zukanovich Funchal, Renata/0000-0001-6749-0022; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Pimenta, Mario/0000-0002-2590-0908; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Ragazzi, Stefano/0000-0001-8219-2074; Roditi, Itzhak/0000-0003-2363-5626; Zuniga, Juan/0000-0002-1041-6451; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Vaz, Pedro/0000-0002-7186-2359; Ruiz, Alberto/0000-0002-3639-0368; Shellard, Ronald/0000-0002-2983-1815; Dracos, Marcos/0000-0003-0514-193X; Rovelli, Tiziano/0000-0002-9746-4842; Fernandez-Alonso, Mercedes/0000-0002-1311-5275; Lozano-Bahilo, Julio/0000-0003-0613-140X; Olshevskiy, Alexander/0000-0002-8902-1793; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Zaitsev, Alexandre/0000-0002-4961-8368; Matteuzzi, Clara/0000-0002-4047-4521; DE MIN, ALBERTO/0000-0002-8130-9389; Demaria, Natale/0000-0003-0743-9465; Bonesini, Maurizio/0000-0001-5119-1896; Sannino, Mario/0000-0001-7700-8383; De Lotto, Barbara/0000-0003-3624-4480; Benlloch Baviera, Jose Maria/0000-0001-6073-1436; Tabarelli de Fatis, Tommaso/0000-0001-6262-4685; Lacasta, Carlos/0000-0002-2623-6252 NR 47 TC 68 Z9 68 U1 0 U2 14 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 DEC 30 PY 1991 VL 367 IS 3 BP 511 EP 574 DI 10.1016/0550-3213(91)90007-K PG 64 WC Physics, Particles & Fields SC Physics GA GX732 UT WOS:A1991GX73200001 ER PT J AU CHAUDHURI, S LYKKEN, JD AF CHAUDHURI, S LYKKEN, JD TI ANALYZING THE SOLUTIONS OF HERMITIAN MATRIX MODELS SO NUCLEAR PHYSICS B LA English DT Article ID 2-DIMENSIONAL QUANTUM-GRAVITY; ONE DIMENSION; STRINGS; EQUATIONS; LESS AB We analyze in detail the nonperturbative solutions of both the usual and the bigeneric k-multicritical hermitian matrix models. We show that the methods of Boutroux can be generalized to provide "triply truncated" solutions of the string equations which are unique up to symmetries of the equations. For k even, the solutions to the string equations thus obtained are always complex. For k odd, the usual multicritical one-matrix models always have real solutions. The bigeneric models for k odd have real specific heat, but certain correlators may be complex. We also make explicit the relation between these results and an eigenvalue analysis on the sphere. RP CHAUDHURI, S (reprint author), FERMI NATL ACCELERATOR LAB,THEORY GRP,POB 500,BATAVIA,IL 60510, USA. NR 32 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD DEC 30 PY 1991 VL 367 IS 3 BP 614 EP 636 DI 10.1016/0550-3213(91)90010-U PG 23 WC Physics, Particles & Fields SC Physics GA GX732 UT WOS:A1991GX73200004 ER PT J AU LEE, SY BALL, M BRABSON, B CAUSSYN, DD COLLINS, J CURTIS, S DERENCHUCK, V DUPLANTIS, D EAST, G ELLISON, M ELLISON, T FRIESEL, D HAMILTON, B JONES, WP LAMBLE, W LI, D MINTY, MG SCHWANDT, P SLOAN, T XU, G CHAO, AW TEPIKIAN, S NG, KY AF LEE, SY BALL, M BRABSON, B CAUSSYN, DD COLLINS, J CURTIS, S DERENCHUCK, V DUPLANTIS, D EAST, G ELLISON, M ELLISON, T FRIESEL, D HAMILTON, B JONES, WP LAMBLE, W LI, D MINTY, MG SCHWANDT, P SLOAN, T XU, G CHAO, AW TEPIKIAN, S NG, KY TI EXPERIMENTAL-DETERMINATION OF A NONLINEAR HAMILTONIAN IN A SYNCHROTRON SO PHYSICAL REVIEW LETTERS LA English DT Article AB The nonlinear beam dynamics of transverse betatron oscillations were studied experimentally at the Indiana University Cyclotron Facility Cooler Ring. Particles were kicked onto resonance islands and the properties of these islands were studied. The island tune was determined with high precision by Fourier analyzing the spectrum containing the island oscillations. The island width was estimated based on a single-resonance model. The Hamiltonian of particle motion near a resonance condition was thus deduced. C1 SUPERCONDUCTING SUPER COLLIDER LAB,DALLAS,TX 75237. BROOKHAVEN NATL LAB,UPTON,NY 11973. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP LEE, SY (reprint author), INDIANA UNIV,CYCLOTRON FACIL,BLOOMINGTON,IN 47405, USA. OI Curtis, Scott/0000-0002-5510-4566 NR 13 TC 33 Z9 34 U1 2 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD DEC 30 PY 1991 VL 67 IS 27 BP 3768 EP 3771 DI 10.1103/PhysRevLett.67.3768 PG 4 WC Physics, Multidisciplinary SC Physics GA GX161 UT WOS:A1991GX16100010 ER PT J AU PERRY, TS DAVIDSON, SJ SERDUKE, FJD BACH, DR SMITH, CC FOSTER, JM DOYAS, RJ WARD, RA IGLESIAS, CA ROGERS, FJ ABDALLAH, J STEWART, RE KILKENNY, JD LEE, RW AF PERRY, TS DAVIDSON, SJ SERDUKE, FJD BACH, DR SMITH, CC FOSTER, JM DOYAS, RJ WARD, RA IGLESIAS, CA ROGERS, FJ ABDALLAH, J STEWART, RE KILKENNY, JD LEE, RW TI OPACITY MEASUREMENTS IN A HOT DENSE MEDIUM SO PHYSICAL REVIEW LETTERS LA English DT Article ID PLASMAS; LINES AB The first measurements of the opacity in a well characterized, hot, dense, laser-produced plasma are reported. Measurements of the absorption of x rays by 1 to 2 transitions in AlXII through AlVIII have been made in a laser heated slab plasma at the measured temperature and density of 58 +/- 4 eV and 0.020 +/- 0.007 g/cm3. The conditions in the plasma were determined to be reproducible, spatially uniform, and in nearly complete local thermodynamic equilibrium. The absorption spectra and the temperature-density data obtained provide an improved means for comparison with detailed atomic physics and opacity calculations. C1 ATOM WEAP ESTAB,READING RG7 4PR,ENGLAND. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP PERRY, TS (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. RI Perry, Theodore/K-3333-2014 OI Perry, Theodore/0000-0002-8832-2033 NR 15 TC 167 Z9 175 U1 1 U2 13 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 DEC 30 PY 1991 VL 67 IS 27 BP 3784 EP 3787 DI 10.1103/PhysRevLett.67.3784 PG 4 WC Physics, Multidisciplinary SC Physics GA GX161 UT WOS:A1991GX16100014 ER PT J AU KLITSNER, T NELSON, JS AF KLITSNER, T NELSON, JS TI SITE-SPECIFIC HYDROGEN REACTIVITY AND REVERSE CHARGE-TRANSFER ON GE(111)-C(2X8) SO PHYSICAL REVIEW LETTERS LA English DT Article ID SCANNING TUNNELING MICROSCOPY; SI(111)-(7X7); SURFACES AB Scanning tunneling microscopy (STM) and first-principles pseudopotential calculations are used to show that the equilibrium binding site for hydrogen on Ge(111)-c(2x8) is the rest-atom site. Our calculations show the hydrogen-rest-atom configuration is 0.7 eV lower in energy than the hydrogen-adatom configuration. Reaction at the rest-atom site causes very local rest-atom to adatom reverse charge transfer, and this site-specific chemistry is imaged directly using STM measurements in combination with these calculations. RP KLITSNER, T (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 18 TC 44 Z9 44 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD DEC 30 PY 1991 VL 67 IS 27 BP 3800 EP 3803 DI 10.1103/PhysRevLett.67.3800 PG 4 WC Physics, Multidisciplinary SC Physics GA GX161 UT WOS:A1991GX16100018 ER PT J AU MACEK, JH AF MACEK, JH TI SOME REMARKS ON STRONG-POTENTIAL-BORN EXPANSIONS FOR ION ATOM COLLISIONS - REPLY SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID HYDROGEN-LIKE ION; ELECTRON-CAPTURE; BARE ION; APPROXIMATION AB Perturbation theories for Coulomb potentials are discussed. The equations of perturbation theory for such potentials cannot be solved by conventional Green function techniques, thus solutions employing more general methods are used. We apply these more general methods to the distorted-wave strong-potential-Born (SPB) approximation for electron capture. The amplitudes are shown to be unique and well represented in a commonly used peaking approximation. An elementary discussion is given in response to recent criticisms of the theory. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. RP MACEK, JH (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. NR 17 TC 8 Z9 8 U1 0 U2 0 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 DEC 28 PY 1991 VL 24 IS 24 BP 5121 EP 5131 DI 10.1088/0953-4075/24/24/011 PG 11 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GY545 UT WOS:A1991GY54500011 ER PT J AU BARNABAS, MV TRIFUNAC, AD AF BARNABAS, MV TRIFUNAC, AD TI ELECTRONIC STATES OF CIS-DECALIN AND TRANS-DECALIN RADICAL CATIONS IN ZEOLITES SO CHEMICAL PHYSICS LETTERS LA English DT Article ID HALOCARBON MATRICES; CYCLOHEXANE; RESONANCE; MOLECULE AB The radical cations of cis-and trans-decalin have been studied in different synthetic zeolite matrices by EPR spectroscopy. The radical cations were produced by gamma-radiolysis at 77 K. The first experimental observation of both the electronic states (2A1: a(4H) = 50 G and 2A2: a(4H) = 29 G) of the cis-decalin radical cation is reported. The 2A1 and 2A2 states were observed at different temperatures in silicalite S-115. In ZSM-34 and Na-OMEGA-5 one species was observed preferentially, while in offretite a fast exchange between the two states was observed. In Na-Y and Na-X the 2A2 state was the principal species observed. In addition, the bridge-head neutral radical species resulting from ion-molecule reactions was observed. For trans-decalin+., the 2A(g) was observed in ZSM-34, and the 2B(g) state was observed in Na-OMEGA-5. In silicalite, only the 2A(g) state was observed at low temperature. The results for cis- and trans-decalin+. in offretite, Na-Y and Na-X were similar. The stabilization of radical cations via matrix interactions is discussed. RP BARNABAS, MV (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 16 TC 28 Z9 28 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD DEC 27 PY 1991 VL 187 IS 6 BP 565 EP 570 DI 10.1016/0009-2614(91)90437-E PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GX074 UT WOS:A1991GX07400003 ER PT J AU BONANG, CC CAMERON, SM AF BONANG, CC CAMERON, SM TI RESONANCE RAMAN AND HYPER-RAMAN SCATTERING FROM MONOSUBSTITUTED BENZENES SO CHEMICAL PHYSICS LETTERS LA English DT Article ID EXCITATION AB The first Raman and hyper-Raman spectra of chloro- and iodobenzene for excitation resonant with the L(a) electronic state are reported. Both the weakly perturbing chlorine and strongly perturbing iodine substituents induce the same type of Raman activity. The spectra are dominated by the nu-8a fundamental and other totally symmetric vibrational modes (Franck-Condon activity) and show little evidence of significant vibronic behavior. RP BONANG, CC (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT APPL SCI,LIVERMORE,CA 94550, USA. NR 15 TC 16 Z9 16 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD DEC 27 PY 1991 VL 187 IS 6 BP 619 EP 622 DI 10.1016/0009-2614(91)90446-G PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GX074 UT WOS:A1991GX07400012 ER PT J AU JANDERA, P GUIOCHON, G AF JANDERA, P GUIOCHON, G TI EFFECT OF THE SAMPLE SOLVENT ON BAND PROFILES IN PREPARATIVE LIQUID-CHROMATOGRAPHY USING NONAQUEOUS REVERSED-PHASE HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY SO JOURNAL OF CHROMATOGRAPHY LA English DT Article ID MOBILE PHASE; COMPUTER-SIMULATION; SEPARATION; ELUTION; BINARY AB If a solvent with a higher elution strength than the mobile phase is used to dissolve poorly soluble samples in preparative chromatography, significant deformation of the band profiles occurs, especially when the column is overloaded. Eventually, band splitting may take place. This behavior was observed in non-aqueous reversed-phase chromatography of cholesterol and other low-polarity sample compounds dissolved in a non-polar solvent, such as dichloromethane, at concentrations exceeding their solubilities in the mobile phase, a higher polarity solvent such as acetonitrile. In this chromatographic system, the dependence of the band deformation and of its splitting on the volume and concentration of the sample, the composition of the mobile phase and the column temperature were investigated. A model taking into account the dependence of the solubility of the sample components in the sample solvent and in the eluent and of the equilibrium isotherm of these components between the stationary and mobile phases on the composition of these two solvents (eluent and sample solvent) was worked out. The possible formation of supersaturated solutions was also considered in the model. This model permits the computer simulation of the band profiles for a single compound or for mixtures dissolved in a solvent different from the mobile phase. The results of the simulations are in qualitative agreement with the behavior observed experimentally. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 15 TC 42 Z9 42 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 DEC 27 PY 1991 VL 588 IS 1-2 BP 1 EP 14 DI 10.1016/0021-9673(91)85001-V PG 14 WC Chemistry, Analytical SC Chemistry GA GZ704 UT WOS:A1991GZ70400001 ER PT J AU DURANT, JL AF DURANT, JL TI ANOMALOUS METHOXY RADICAL YIELDS IN THE FLUORINE+METHANOL REACTION .1. EXPERIMENT SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID HYDROGEN-ATOM ABSTRACTION; INFRARED CHEMI-LUMINESCENCE; LASER-INDUCED FLUORESCENCE; FLUORINE-ATOMS; TEMPERATURE-DEPENDENCE; ENERGY DISPOSAL; CH3OH; OH AB We have used a new discharge-flow apparatus with modulated-beam mass spectrometric detection to study product-branching fractions for the reactions of F atom with methanol and deuterated methanols. Despite the fact that formation of hydroxymethyl radical is favored both energetically and on the basis of hydrogen atom statistics, we find enhanced formation of the methoxy radical in this system. Specifically, the fractional yields of methoxy radicals at room temperature for the two isotopically mixed methanols are X(methoxy) = 0.56 +/- 0.03 for the reaction F + CD3OH --> products and X(methoxy) = 0.37 +/- 0.02 for the reaction F + CH3OD --> products, where the error bars are 2-sigma estimates of statistical errors. Measurements of the fractional yields of methoxy radicals for these two reactions at 830 and 960 K are consistent with a temperature-independent product-branching fraction. Relative-rate measurements for HF and DF formation from the reactions F + CH3OH,CD3OH --> products allow us to calculate site-specific relative reaction rate coefficients and kinetic isotope effects, as well as room temperature methoxy radical yields of X(methoxy) = 0.6 +/- 0.2 (2-sigma) for the reaction F + CH3OH --> products and X(methoxy) = 0.4 +/- 0.3 (2-sigma) for the reaction F + CD3OD --> products. Reasons for the anomalously high methoxy radical yields are discussed. RP DURANT, JL (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. NR 20 TC 18 Z9 18 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 DEC 26 PY 1991 VL 95 IS 26 BP 10701 EP 10704 DI 10.1021/j100179a035 PG 4 WC Chemistry, Physical SC Chemistry GA GY164 UT WOS:A1991GY16400035 ER PT J AU GLAUSER, WA KOSZYKOWSKI, ML AF GLAUSER, WA KOSZYKOWSKI, ML TI ANOMALOUS METHOXY RADICAL YIELDS IN THE FLUORINE+METHANOL REACTION .2. THEORY SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID TRANSITION-STATE THEORY; INFRARED CHEMI-LUMINESCENCE; MOLECULAR-ORBITAL METHODS; FLUORINE-ATOMS; HYDROGEN ABSTRACTION; PERTURBATION-THEORY; GAS-PHASE; ABINITIO; ENERGY; OPTIMIZATION AB We have carried out ab initio calculations using Moller-Plesset perturbation theory and several basis sets for the title hydrogen abstraction reaction in order to understand the theoretical basis for the anomalously large methoxy (product resulting from hydroxyl-side attack) vs hydroxymethyl (product resulting from methyl-side attack) yields observed experimentally. Of the three unique abstraction sites on methanol, we have located a saddle point for the syn-methyl channel, a hilltop for the anti-methyl channel, and a minimum (hydrogen-bonded complex) for the hydroxyl channel. The calculated classical barrier height was 1.89 kcal/mol for the methyl-side attack and negligible for the hydroxyl-side attack. Using conventional transition-state theory, the rate coefficients (in units of cm3 molecule-1 s-1) for methoxy production vary from 2.83 x 10(-11) at 298 K to 8.99 x 10(-11) at 960 K. The calculated methoxy branching fractions are consistent with the observations in paper 1 of this series and vary from 0.70 at 298 K to 0.59 at 960 K. Our analysis of these results provides a qualitative explanation for the anomalously large methoxy yields. The limitations of this approach imposed by the approximations used in both the electronic structure as well as rate constant calculations are discussed. C1 SANDIA NATL LABS, COMBUST RES FACIL, LIVERMORE, CA 94551 USA. NR 44 TC 12 Z9 12 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD DEC 26 PY 1991 VL 95 IS 26 BP 10705 EP 10713 DI 10.1021/j100179a036 PG 9 WC Chemistry, Physical SC Chemistry GA GY164 UT WOS:A1991GY16400036 ER PT J AU HILL, JC WOHN, FK SCHWELLENBACH, DD SMITH, AR AF HILL, JC WOHN, FK SCHWELLENBACH, DD SMITH, AR TI OBSERVATION OF VERY LARGE ELECTROMAGNETIC DISSOCIATION CROSS-SECTIONS SO PHYSICS LETTERS B LA English DT Article ID RELATIVISTIC HEAVY-IONS; SINGLE-NUCLEON REMOVAL; AU-197 TARGETS; COLLISIONS; ENERGIES; PROJECTILES; CO-59; AU AB An electromagnetic dissociation (ED) cross section of 3.16 +/- 0.23 b was observed for Au-197(U-238, X)Au-197 with 0.96 GeV/nucleon U-238 projectiles. The gross features of ED are reproduced in a Weizsacker-Williams (WW) calculation, but the projectile charge dependence is weaker than expected from WW. WW calculations are extended to the regime of energies of the next generation of relativistic heavy-ion colliders. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP HILL, JC (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 18 TC 22 Z9 22 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 DEC 26 PY 1991 VL 273 IS 4 BP 371 EP 374 DI 10.1016/0370-2693(91)90285-X PG 4 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GY385 UT WOS:A1991GY38500002 ER PT J AU SEVOV, SC CORBETT, JD AF SEVOV, SC CORBETT, JD TI A REMARKABLE HYPOELECTRONIC INDIUM CLUSTER IN K8IN11 SO INORGANIC CHEMISTRY LA English DT Note ID CRYSTAL-STRUCTURE; ALKALI-METALS; GALLIUM C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 28 TC 118 Z9 119 U1 2 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD DEC 25 PY 1991 VL 30 IS 26 BP 4875 EP 4877 DI 10.1021/ic00026a004 PG 3 WC Chemistry, Inorganic & Nuclear SC Chemistry GA GX615 UT WOS:A1991GX61500004 ER PT J AU RAO, KM DAY, CL JACOBSON, RA ANGELICI, RJ AF RAO, KM DAY, CL JACOBSON, RA ANGELICI, RJ TI ETA-1(S)-COORDINATION AND ETA-6-COORDINATION OF DIBENZOTHIOPHENE (DBT) IN CP-STAR-MCL2[ETA-1(S)-DBT] AND CP-STAR-M(ETA-6-DBT)2+ (M = IR, RH) SO INORGANIC CHEMISTRY LA English DT Note ID COMPLEXES; REACTIVITY; RUTHENIUM; THIOPHENE; MODELS C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 24 TC 41 Z9 41 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD DEC 25 PY 1991 VL 30 IS 26 BP 5046 EP 5049 DI 10.1021/ic00026a037 PG 4 WC Chemistry, Inorganic & Nuclear SC Chemistry GA GX615 UT WOS:A1991GX61500037 ER PT J AU HARPEL, MR LARIMER, FW HARTMAN, FC AF HARPEL, MR LARIMER, FW HARTMAN, FC TI FUNCTIONAL-ANALYSIS OF THE PUTATIVE CATALYTIC BASES HIS-321 AND SER-368 OF RHODOSPIRILLUM-RUBRUM RIBULOSE BISPHOSPHATE CARBOXYLASE OXYGENASE BY SITE-DIRECTED MUTAGENESIS SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID TRIOSE PHOSPHATE ISOMERASE; RIBULOSEBISPHOSPHATE CARBOXYLASE; ACTIVE-SITE; RIBULOSE-1,5-BISPHOSPHATE CARBOXYLASE; 1,5-BISPHOSPHATE CARBOXYLASE; CARBON-DIOXIDE; PROTEIN; ANALOGS; ENZYME; PHOSPHOGLYCOLATE AB Numerous candidates have been suggested according to chemical and structural criteria for the active site base of ribulose bisphosphate carboxylase/oxygenase that catalyzes substrate enolization. We evaluate the functional significance of two such candidates, His-321 and Ser-368 of the Rhodospirillum rubrum enzyme, by site-directed mutagenesis. Position 321 mutants retain 3-12% of wild-type rates of both overall carboxylation and the initial enolization, with little effect on K(m) for CO2 or ribulose bisphosphate. Position 368 mutants exhibit approximately 1% of wild-type carboxylation but 4-9% of enolization, also accompanied by little effect on K(m) values. The modest catalytic facilitations elicited by these residues are incompatible with either acting as the crucial base. The enhanced efficiency of the position 368 mutants in enolization versus carboxylation clearly indicates that Ser-368 effects catalysis preferentially beyond the point of proton abstraction. Both sets of mutants bind the reaction intermediate analogue, 2-carboxy-D-arabinitol bisphosphate, stoichiometrically. Ligand exchange from complexes with position 321 mutants is increased relative to wild type, whereas complexes with position 368 mutants are more exchange-inert. Therefore, His-321 may assist stabilization of the transition state mimicked by the analogue. C1 OAK RIDGE NATL LAB, DIV BIOL, PROT ENGN PROGRAM, POB 2009, OAK RIDGE, TN 37831 USA. NR 46 TC 27 Z9 27 U1 2 U2 4 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 DEC 25 PY 1991 VL 266 IS 36 BP 24734 EP 24740 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA GW845 UT WOS:A1991GW84500076 PM 1761567 ER PT J AU NORTHRUP, MA KULP, TJ ANGEL, SM AF NORTHRUP, MA KULP, TJ ANGEL, SM TI APPLICATION OF FLUORESCENT PARTICLE IMAGING TO MEASURING FLOW IN COMPLEX MEDIA SO ANALYTICA CHIMICA ACTA LA English DT Article DE FLUOROMETRY; FLUID FLOW; PARTICLE IMAGING ID PACKED-BEDS; FLUID; VELOCITY AB The development of fluorescence-based experimental techniques that can be used to obtain quantitative information about the flow of fluids through porous media is reported. Flow information is obtained by illuminating a two-dimensional slice of refractive index matched model of a porous medium with a planar laser beam. The flowing liquid phase is seeded with 10-mu-m diameter fluorescent particles, and time-sequenced photographs of the illuminated plane provide quantitative information about the velocity of the flowing liquid. The method provides simultaneous measurements of point level and spatially averaged velocity vectors within the interstitial spaces of the medium. Porosity and preliminary tracer concentration measurements were made in a similar manner with the use of a fluorescent dye. The use of fluorescence, spectral filtering and refractive index matching permits a unique application of particle and tracer imaging to the study of flow in porous systems. The results from this technique compare favorably with the expected macroscopically derived results; the significance of these results and methodology is that they provide experimental verification of fundamental multi-phase transport equations. The application of this technique might be extended to experimental studies of flow in optically transparent models of biological, chemical and physical systems. RP NORTHRUP, MA (reprint author), UNIV CALIF LAWRENCE,LAWRENCE LIVERMORE NATL LAB,DIV ENVIRONM SCI,LIVERMORE,CA 94551, USA. NR 15 TC 5 Z9 5 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0003-2670 J9 ANAL CHIM ACTA JI Anal. Chim. Acta PD DEC 24 PY 1991 VL 255 IS 2 BP 275 EP 282 PG 8 WC Chemistry, Analytical SC Chemistry GA GY855 UT WOS:A1991GY85500009 ER PT J AU HOHIMER, JP CRAFT, DC HADLEY, GR VAWTER, GA WARREN, ME AF HOHIMER, JP CRAFT, DC HADLEY, GR VAWTER, GA WARREN, ME TI SINGLE-FREQUENCY CONTINUOUS-WAVE OPERATION OF RING RESONATOR DIODE-LASERS SO APPLIED PHYSICS LETTERS LA English DT Article AB We report continuous-wave room-temperature operation of a semiconductor ring resonator diode laser with a single Y-junction outcoupling waveguide. This device with a 150-mu-m radius and 8-mu-m-wide etched-rib waveguide has a threshold current of 72 mA and emits up to 1 mW of single-frequency output. The side-mode-rejection ratio of this laser exceeds 22 dBm over a > 50 mA current range corresponding to a stable operating mode of the laser. Studies of the emission behavior in this and other similar ring lasers suggest that the ring is lasing in "whispering gallery" modes, and also that the Y junction is affecting mode selection in the ring. RP SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. NR 9 TC 53 Z9 53 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0003-6951 EI 1077-3118 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD DEC 23 PY 1991 VL 59 IS 26 BP 3360 EP 3362 DI 10.1063/1.105730 PG 3 WC Physics, Applied SC Physics GA GW018 UT WOS:A1991GW01800004 ER PT J AU KAHANER, DK NG, E SCHIESSER, WE THOMPSON, S AF KAHANER, DK NG, E SCHIESSER, WE THOMPSON, S TI EXPERIMENTS WITH AN ORDINARY DIFFERENTIAL-EQUATION SOLVER IN THE PARALLEL SOLUTION OF METHOD OF LINES PROBLEMS ON A SHARED-MEMORY PARALLEL COMPUTER SO JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON COMPUTATIONAL MATHEMATICS ( ISCM 90 ) CY AUG 29-SEP 04, 1990 CL MATSUYAMA, JAPAN SP MATH SOC JAPAN, EHIME UNIV DE ORDINARY DIFFERENTIAL EQUATIONS; ODE; NUMERICAL ANALYSIS; METHOD OF LINES; MOL; MATHEMATICAL SOFTWARE ID STIFF AB We consider method of lines solutions of partial differential equations on shared-memory parallel computers. Solutions using the ordinary differential equation solver SDRIV3 (which is similar to the well-known LSODE solver) are considered. It is shown that portions of the solver may be implemented in parallel. In particular, formation of the Jacobian matrix and the linear algebra required to solve the corrector equations are natural candidates for parallel implementation since these portions dominate the cost of solving large systems of equations. A variant of Gaussian elimination is described which allows efficient parallel solution of systems of linear equations. An implementation of SDRIV3 which performs the Jacobian related calculations in parallel and which uses this variant of Gaussian elimination is described. The modified solver is used to solve a model hyperbolic fluid flow problem. Timing results, obtained using a Sequent Balance parallel computer, are given which demonstrate that substantial speedups are possible. Extensions of the techniques to sparse problems are discussed and illustrated for a problem involving a humidification column which contacts air and water. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. OAK RIDGE NATL LAB,OAK RIDGE,TN. LEHIGH UNIV,BETHLEHEM,PA 18015. RADFORD UNIV,RADFORD,VA 24142. NR 20 TC 3 Z9 3 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-0427 J9 J COMPUT APPL MATH JI J. Comput. Appl. Math. PD DEC 23 PY 1991 VL 38 IS 1-3 BP 231 EP 253 DI 10.1016/0377-0427(91)90173-H PG 23 WC Mathematics, Applied SC Mathematics GA GX448 UT WOS:A1991GX44800018 ER PT J AU GARCIA, A ADELBERGER, EG MAGNUS, PV SWANSON, HE TENGBLAD, O MOLTZ, DM AF GARCIA, A ADELBERGER, EG MAGNUS, PV SWANSON, HE TENGBLAD, O MOLTZ, DM TI BETA+ DECAYS OF CA-37 - IMPLICATIONS FOR THE EFFICIENCY OF THE CL-37 SOLAR V DETECTOR SO PHYSICAL REVIEW LETTERS LA English DT Article ID CROSS-SECTION; ENERGY-LEVELS; NEUTRINOS; NUCLEI AB We studied Ca-37 beta+ decays using a mass-separated Ca-37 beam and a proton telescope with 16-keV resolution. Delayed p's were detected in coincidence with gamma's to identify p decays of K-37 daughter levels to excited states of Ar-36. We observed 43 previously undetected proton groups, yielding an integrated B(GT) twice as large as that observed previously. Although our result increases the efficiency of the Cl-37 detector for counting solar v's by 6%, its main effect is to reduce uncertainties in this efficiency arising from discrepancies between previous Ca-37 beta-decay and Cl-37(p,n) results. C1 UNIV WASHINGTON,NUCL PHYS LAB,SEATTLE,WA 98195. CERN,PPE DIV,CH-1211 GENEVA 23,SWITZERLAND. RP GARCIA, A (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720, USA. OI Garcia, Alejandro/0000-0001-6056-6645 NR 21 TC 74 Z9 75 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD DEC 23 PY 1991 VL 67 IS 26 BP 3654 EP 3657 DI 10.1103/PhysRevLett.67.3654 PG 4 WC Physics, Multidisciplinary SC Physics GA GW006 UT WOS:A1991GW00600006 ER PT J AU BIGLARI, H CHEN, L AF BIGLARI, H CHEN, L TI UNIFIED THEORY OF RESONANT EXCITATION OF KINETIC BALLOONING MODES BY ENERGETIC IONS AND ALPHA-PARTICLES IN TOKAMAKS SO PHYSICAL REVIEW LETTERS LA English DT Article ID INTERNAL KINK MODES; INSTABILITIES AB A complete theory of wave-particle interactions is presented whereby both circulating and trapped energetic ions can destabilize kinetic ballooning modes in tokamaks. Four qualitatively different types of resonances, involving wave-precessional drift, wave-transit, wave-bounce, and precessional drift-bounce interactions, are identified, and the destabilization potential of each is assessed. Implications of the theory for present and future-generation fusion experiments are discussed. In particular, it is suggested that these modes may be the dominant collective alpha-particle instability in reactorlike environments. RP BIGLARI, H (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08544, USA. RI chen, liu/I-2297-2013 NR 19 TC 54 Z9 54 U1 0 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD DEC 23 PY 1991 VL 67 IS 26 BP 3681 EP 3684 DI 10.1103/PhysRevLett.67.3681 PG 4 WC Physics, Multidisciplinary SC Physics GA GW006 UT WOS:A1991GW00600013 ER PT J AU BOYD, RN FULLER, GM AF BOYD, RN FULLER, GM TI EFFECTS OF NEGATIVELY CHARGED MASSIVE PARTICLES ON PRIMORDIAL STARS SO ASTROPHYSICAL JOURNAL LA English DT Article DE ELEMENTARY PARTICLES; STARS, ABUNDANCES; STARS, INTERIORS ID SUPERMASSIVE STARS; DYNAMICAL PHASES; STABLE PARTICLES; SEARCH; EVOLUTION; ELEMENTS; HYDROGEN; NUCLEI AB The effects of negatively charged non-strongly interacting massive particles, denoted as X- particles, on stellar hot hydrogen burning are considered. Such particles would bind to nuclei and catalyze a very efficient hydrogen-burning cycle. This nuclear burning cycle would occur because the additional binding energy provided by binding the X- particles to Be-8 nuclei creates a stable entity. Although such a cycle would not be likely to be of significance to present-day stars, it could significantly alter the range of masses for which primordial Population III stars explode. The nucleosynthesis produced in these X--induced supernovae can differ markedly from that of ordinary beta-limited CNO cycle-induced explosions of very massive and super-massive stars. Thus the resulting abundances might provide constraints on the existence of intermediate lifetime X- particles and/or the Population III initial mass function. C1 UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210. OHIO STATE UNIV,DEPT ASTRON,COLUMBUS,OH 43210. RP BOYD, RN (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 30 TC 1 Z9 1 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 DEC 20 PY 1991 VL 383 IS 2 BP 615 EP 620 DI 10.1086/170819 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GW194 UT WOS:A1991GW19400014 ER PT J AU DRAINE, BT WOODS, DT AF DRAINE, BT WOODS, DT TI SUPERNOVA-REMNANTS IN DENSE CLOUDS .1. BLAST-WAVE DYNAMICS AND X-RAY-IRRADIATION SO ASTROPHYSICAL JOURNAL LA English DT Article DE NEBULAE, SUPERNOVA REMNANTS; RADIATION MECHANISMS; SHOCK WAVES; X-RAYS, GENERAL ID EARLY-TYPE STARS; INTERSTELLAR-MEDIUM; MOLECULAR CLOUDS; OPTICALLY THIN; DUST GRAINS; HOT GAS; MODELS; EMISSION; PHYSICS; PLASMA AB Supernova explosions in dense clouds will result in efficient conversion of supernova explosion energy into X-rays. A large fraction of these X-rays will be absorbed in the unshocked gas surrounding the supernova remnant; because of the penetrating power of the X-rays there may be an extensive "halo" of X-ray-irradiated gas exterior to the supernova shock wave. We use simplified models of cooling supernova remnants in uniform media together with an idealized emission spectrum to investigate the X-ray irradiation of the surrounding gas. We explicitly calculate the radiative transfer of the emitted X-rays through both the dense cooling shell and the unshocked cloud, with a simplified treatment to allow for an ionized zone surrounding the SNR. Numerical results are presented for supernova energy E0 = 10(51) ergs and ambient densities n(H) ranging from 10(2) to 10(6) cm-3. The X-ray energy h deposited per H nucleon characterizes the extent to which the X-rays are capable of heating and ionizing the medium. We find that an appreciable fraction of the X-ray energy is absorbed in regions where h is between 1 and 30 eV; if the gas is initially molecular, the X-ray irradiation will result in warm molecular gas in which endothermic chemical reactions may proceed, and from which there may be strong emission in rotation-vibration transitions of H-2 and other molecular species. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP DRAINE, BT (reprint author), PRINCETON UNIV OBSERV,PEYTON HALL,PRINCETON,NJ 08544, USA. NR 37 TC 44 Z9 44 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD DEC 20 PY 1991 VL 383 IS 2 BP 621 EP 638 DI 10.1086/170820 PN 1 PG 18 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GW194 UT WOS:A1991GW19400015 ER PT J AU KETO, ER LATTANZIO, JC MONAGHAN, JJ AF KETO, ER LATTANZIO, JC MONAGHAN, JJ TI GRAVITATIONAL FRAGMENTATION - A COMPARISON WITH W49A SO ASTROPHYSICAL JOURNAL LA English DT Article DE HYDRODYNAMICS; INTERSTELLAR, MOLECULES; NEBULAE, H-II REGIONS; NEBULAE, INDIVIDUAL (W49); STARS, FORMATION ID COLLAPSE; CLOUDS AB We investigate the process of gravitational fragmentation of molecular clouds through a comparison of numerical and observational results. We calculate the expected millimeter wave molecular line emission from a model fragmenting cloud generated by a numerical hydrodynamic simulation and compare with observations of HCO+ from the star-forming region W49A. Our investigation suggests that the rotating ring of H II regions, the necklace in W49A, may have formed in the gravitational fragmentation of a flattened rotating molecular cloud. C1 UNIV ILLINOIS,ASTRON IMAGING LAB,URBANA,IL 61801. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. MONASH UNIV,DEPT MATH,CLAYTON,VIC 3168,AUSTRALIA. UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720. RP KETO, ER (reprint author), HARVARD SMITHSONIAN CTR ASTROPHYS,60 GARDEN ST,CAMBRIDGE,MA 02138, USA. NR 19 TC 22 Z9 22 U1 0 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD DEC 20 PY 1991 VL 383 IS 2 BP 639 EP 644 DI 10.1086/170821 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GW194 UT WOS:A1991GW19400016 ER PT J AU STANGHELLINI, L COX, AN STARRFIELD, S AF STANGHELLINI, L COX, AN STARRFIELD, S TI POSTASYMPTOTIC GIANT BRANCH NONRADIAL INSTABILITY STRIPS SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, EVOLUTION; STARS, INTERIORS; STARS, PULSATION; STARS, WHITE DWARFS ID PLANETARY-NEBULA NUCLEI; WHITE-DWARFS; EVOLUTIONARY SEQUENCES; STELLAR PULSATIONS; CENTRAL STAR; HYDROGEN; HOT; K1-16 AB We have performed stability analyses, for nonradial g+-mode pulsations of post-asymptotic giant branch (AGB) stellar models, to determine the location of their pulsational instability strips in the Hertzsprung-Russell diagram. In this paper we analyze stellar models that are assumed to have undergone a major mass loss event either near the tip of the asymptotic giant branch or shortly thereafter and, therefore, consist of a 50% carbon 50% oxygen core. All the models, which are analyzed for nonradial, nonadiabatic pulsational instabilities, are developed by using an evolutionary post-AGB track calculated for us by Iben & Hollowell. Their mass is 0.6 M., which is in good agreement with the peak of the observed distribution of white dwarf masses. We use four different surface compositions: (a) 50% helium and 50% carbon, (b) 10% helium and 90% carbon, (c) 50% carbon and 50% oxygen, and (d) pure helium, all by mass. Thin surface layers are necessary to resolve the nonadiabatic pulsation effects. We use 1500 mass zones. The opacities and equations of state used in calculating the structure of the surface layers are obtained from the Los Alamos Astrophysical Opacity Library tables. These surface layers are assumed to extend to temperatures between 10(7) K and 6 x 10(7) K, depending on how to join them smoothly to the deeper layers that use the Iben analytic fit. The CO cores include 81% of the total mass in all but two pulsationally unstable models. Using a Lagrangian, nonradial, nonadiabatic pulsation stability program we find pulsationally unstable models for all four compositions, but the instability strips narrow in effective temperature as the helium abundance increases. Pulsation driving occurs in the outer 10(-9) or less of the star's mass, which is sometimes thinner and sometimes thicker than the surface convection zone. For the pure CO surface composition, we obtain an instability strip that extends from the domain of the old planetary nebulae nuclei down the pre-white dwarf (pre-WD) cooling track to the helium surface DB white dwarfs. Our results are compared both to the observed planetary nebula nuclei variables and the hot, pulsating DO variables. We also analyze the stability of DB white dwarfs, which have much deeper and stronger convection zones, and find an instability strip between about 18,000 and 26,000 K approximately as observed for the known variable stars. C1 UNIV CALIF LOS ALAMOS SCI LAB,IGPP,LOS ALAMOS,NM 87545. UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. ARIZONA STATE UNIV,DEPT PHYS & ASTRON 1504,TEMPE,AZ 85287. RP STANGHELLINI, L (reprint author), OSSERV ASTRON BOLOGNA,VIA ZAMBONI 33,I-40126 BOLOGNA,ITALY. NR 53 TC 34 Z9 34 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 DEC 20 PY 1991 VL 383 IS 2 BP 766 EP 778 DI 10.1086/170835 PN 1 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GW194 UT WOS:A1991GW19400030 ER PT J AU ALEXANDREAS, DE BERLEY, D BILLER, S BURMAN, RL CADY, DR CHANG, CY DINGUS, BL DION, CL DION, GM ELLSWORTH, RW FREEDMAN, SJ FUJIKAWA, BK GOODMAN, JA HAINES, TJ HOFFMAN, CM KRAKAUER, DA KWOK, PW LU, XQ NAGLE, DE POTTER, M SANDBERG, VD SINNIS, C STARK, MJ VISHWANATH, PR YODH, GB ZHANG, WP AF ALEXANDREAS, DE BERLEY, D BILLER, S BURMAN, RL CADY, DR CHANG, CY DINGUS, BL DION, CL DION, GM ELLSWORTH, RW FREEDMAN, SJ FUJIKAWA, BK GOODMAN, JA HAINES, TJ HOFFMAN, CM KRAKAUER, DA KWOK, PW LU, XQ NAGLE, DE POTTER, M SANDBERG, VD SINNIS, C STARK, MJ VISHWANATH, PR YODH, GB ZHANG, WP TI A SEARCH OF THE NORTHERN SKY FOR ULTRA HIGH-ENERGY POINT SOURCES SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC RAYS GENERAL; GAMMA-RAYS GENERAL ID CYGNUS-X-3 AB A search has been made for steady emission of ultra-high-energy radiation from individual point sources over most of the northern sky. Over 2 x 10(8) air showers induced by primary particles of energy greater than about 10 TeV were recorded from 1986 April until 1991 May by the CYGNUS air shower array. No statistically significant excess above the background from the isotropic flux of cosmic rays was found for any direction in the sky from 0-degrees to 80-degrees declination. In addition, 49 specific potential sources were examined, and none showed a statistically significant excess of events. 90% confidence level flux upper limits are established for the continuous emission from these sources; for a source that transits the zenith, a representative upper limit corresponds to an integral flux above 40 TeV of about 1.7 x 10(-13) cm-2 s-1 (0.5% of the cosmic-ray flux within an angular area of 1.8 x 10(-3) sr) assuming a power-law energy spectrum with a differential spectral index of -2.7. C1 UNIV MARYLAND,DEPT PHYS,COLLEGE PK,MD 20742. NATL SCI FDN,WASHINGTON,DC 20550. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556. GEORGE MASON UNIV,DEPT PHYS,FAIRFAX,VA 22030. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. TATA INST FUNDAMENTAL RES,BOMBAY 400005,INDIA. RP ALEXANDREAS, DE (reprint author), UNIV CALIF IRVINE,DEPT PHYS,IRVINE,CA 92717, USA. NR 15 TC 28 Z9 28 U1 0 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD DEC 20 PY 1991 VL 383 IS 2 BP L53 EP L56 DI 10.1086/186239 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GW197 UT WOS:A1991GW19700006 ER PT J AU OGASAKA, Y MURAKAMI, T NISHIMURA, J YOSHIDA, A FENIMORE, EE AF OGASAKA, Y MURAKAMI, T NISHIMURA, J YOSHIDA, A FENIMORE, EE TI V/VMAX TEST APPLIED TO GINGA GAMMA-RAY BURSTS SO ASTROPHYSICAL JOURNAL LA English DT Article DE GAMMA-RAYS BURSTS; STARS NEUTRON ID KONUS EXPERIMENT; COUNTERPARTS; ABSORPTION; DISTANCES; CYCLOTRON; FREQUENCY; FEATURES; CATALOG; ORIGIN AB The V/V(max) test has been applied to gamma-ray burst data from Ginga. The Ginga gamma-ray burst detector covers the relatively low energy range where most of the photons occur and thus is able to observe fainter gamma-ray bursts than previous satellites. Since the launch of the satellite in 1987, 89 gamma-ray bursts had been detected as of the beginning of 1990 October. The standard V/V(max) test has been applied to the bursts. The observed value of V/V(max) = 0.35 +/- 0.035 for bursts with more than 8.6 standard deviations above background suggests a nonuniformity in the source distribution which is consistent with a Galactic origin. Details of our analysis and cautions concerning the derived values are discussed. C1 INST PHYS & CHEM RES, WAKO, SAITAMA 335, JAPAN. UNIV CALIF LOS ALAMOS SCI LAB, LOS ALAMOS, NM 87545 USA. RP OGASAKA, Y (reprint author), INST SPACE & ASTRONAUT SCI, 3-1-1 YOSHINODAI, SAGAMIHARA, KANAGAWA 229, JAPAN. NR 35 TC 27 Z9 27 U1 0 U2 0 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 DEC 20 PY 1991 VL 383 IS 2 BP L61 EP L64 DI 10.1086/186241 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GW197 UT WOS:A1991GW19700008 ER PT J AU SHEVENELL, L AF SHEVENELL, L TI TRITIUM IN THE THERMAL WATERS DISCHARGING IN LOOWIT CANYON, MOUNT ST-HELENS, WASHINGTON, USA SO CHEMICAL GEOLOGY LA English DT Article AB The tritium contents in the Loowit hot springs were determined for samples collected in 1986-1989 and H-3 was modeled using two separate methods to estimate fluid ages and determine if an older component of water enters the geothermal system at Loowit. Estimated fluid ages, assuming either well-mixed or piston-flow behavior, indicate fluid ages could lie in the range of 2-184 yr. Refinements to this first model, with the use of geologic, topographic and hydrologic data, indicate average fluid ages are less-than-or-equal-to 10 yr. Advection-dispersion modeling indicates that average fluid transit times are approximately 5 yr. and horizontal fluid velocities of approximately 200 m yr.-1 can be expected in the Loowit system. Hence, both modeling efforts indicate that water in the Loowit system was recharged after the eruptions of Mt. St. Helens in 1980 and deeper, pre- 1980 fluid, stored in the deposits of the volcano, is not required to explain the behavior of the newly formed geothermal system. RP SHEVENELL, L (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,BLDG 1505,MS 6038,OAK RIDGE,TN 37831, USA. NR 25 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2541 J9 CHEM GEOL JI Chem. Geol. PD DEC 20 PY 1991 VL 94 IS 2 BP 123 EP 135 DI 10.1016/0168-9622(91)90005-H PG 13 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA GZ416 UT WOS:A1991GZ41600004 ER PT J AU HEINZEN, RA FRAZIER, ME MALLAVIA, LP AF HEINZEN, RA FRAZIER, ME MALLAVIA, LP TI SEQUENCE AND LINKAGE ANALYSIS OF THE COXIELLA-BURNETII CITRATE SYNTHASE-ENCODING GENE SO GENE LA English DT Article DE RECOMBINANT DNA; TRICARBOXYLIC ACID CYCLE; RICKETTSIA; HOMOLOGY; SUCCINATE DEHYDROGENASE ID EXTRAGENIC PALINDROMIC SEQUENCES; ESCHERICHIA-COLI; SUCCINATE-DEHYDROGENASE; RICKETTSIA-PROWAZEKII; MESSENGER-RNA; DNA; EXPRESSION; FLAVOPROTEIN; STABILITY; SUBUNITS AB The nucleotide (nt) sequence of the Coxiella burnetii citrate synthase-encoding gene (gltA), previously cloned in Escherichia coli, was determined. The nt sequence analysis revealed an open reading frame (ORF) of 1290 bp capable of coding for a protein of 430 amino acids (aa) with a deduced M(r) of 48 633. Preceding an ATG start codon, a possible transcription start point (tsp) with homology to the E. coli promoter consensus was detected. A poly-purine-rich region occurred immediately upstream from the gltA reading frame and potentially serves as a ribosome-binding site. Additionally, a G + C-rich region of dyad symmetry 3' to the translational stop codon was found that could possibly function as a Rho-independent transcriptional termination signal. A large, nearly perfect, inverted repeat was identified upstream from the gltA tsp and was shown by Southern analysis to be present in multiple copies in the C. burnetii genome. The deduced aa sequence of C. burnetii GltA was optimally aligned with enzymes from various prokaryotic sources and one eukaryotic source (pig heart). Using perfect aa identity, the C. burnetii enzyme demonstrated the greatest homology with GltA from Acinetobacter anitratum (65%). Although only 26% aa identity was seen with the pig heart enzyme, many of the residues identified in ligand binding appear to be conserved. Sequencing studies of a region centered approx. 5.6 kb upstream from gltA revealed an ORF read with opposite polarity that encodes a peptide highly homologous to the C terminus of the flavoprotein subunit of E. coli succinate dehydrogenase. This report represents the first nt sequence analysis of a gene of known function from the obligate intracellular parasite, C. burnetii. C1 WASHINGTON STATE UNIV,DEPT MICROBIOL,PULLMAN,WA 99164. US DOE,OFF ENERGY RES,OFF HLTH & ENVIRONM RES,GTN,WASHINGTON,DC. FU NIAID NIH HHS [AI20190] NR 44 TC 16 Z9 17 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-1119 J9 GENE JI Gene PD DEC 20 PY 1991 VL 109 IS 1 BP 63 EP 69 DI 10.1016/0378-1119(91)90589-4 PG 7 WC Genetics & Heredity SC Genetics & Heredity GA GX099 UT WOS:A1991GX09900008 PM 1756983 ER PT J AU HARVEY, SD CAMPBELL, JA KELSEY, RG VANCE, NC AF HARVEY, SD CAMPBELL, JA KELSEY, RG VANCE, NC TI SEPARATION OF TAXOL FROM RELATED TAXANES IN TAXUS-BREVIFOLIA EXTRACTS BY ISOCRATIC ELUTION REVERSED-PHASE MICROCOLUMN HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY SO JOURNAL OF CHROMATOGRAPHY LA English DT Note ID PACKED CAPILLARY COLUMNS; MASS-SPECTROMETRY; FOSSIL-FUELS; AGENT AB Previous attempts to resolve the closely related taxanes cephalomannine and taxol by reversed-phase high-performance liquid chromatography (HPLC) on octadecyl silica columns have not been successful. In the present study, high-resolution HPLC on microcolumns packed with octadecyl silica was evaluated for the separation of the aforementioned taxanes. Due to the enhanced separation efficiency of this technique, baseline resolution between cephalomannine and taxol was readily achieved under isocratic elution conditions. Chromatographic profiles of Taxus brevifolia twig and needle foliage extracts are presented that illustrate this separation. C1 USDA, PACIFIC NW RES STN, CORVALLIS, OR 97331 USA. RP HARVEY, SD (reprint author), PACIFIC NW LAB, POB 999,BATTELLE BLVD, RICHLAND, WA 99352 USA. NR 26 TC 32 Z9 33 U1 2 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD DEC 20 PY 1991 VL 587 IS 2 BP 300 EP 305 DI 10.1016/0021-9673(91)85172-C PG 6 WC Chemistry, Analytical SC Chemistry GA GY996 UT WOS:A1991GY99600024 ER PT J AU LUECKEN, DJ BERKOWITZ, CM EASTER, RC AF LUECKEN, DJ BERKOWITZ, CM EASTER, RC TI USE OF A 3-DIMENSIONAL CLOUD-CHEMISTRY MODEL TO STUDY THE TRANSATLANTIC TRANSPORT OF SOLUBLE SULFUR SPECIES SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID WET DEPOSITION; DRY DEPOSITION; ATMOSPHERIC TRANSPORT; CHEMICAL-COMPOSITION; SULFATE PRODUCTION; FRONTAL RAINBANDS; SCAVENGING MODEL; NUMERICAL-MODEL; NORTH-AMERICA; DIOXIDE AB This paper describes the development and application of a three-dimensional, global-scale Eulerian model with an explicit description of cloud and chemical processes. The current configuration of the model calculates clear air and aqueous chemistry, cloud and rainwater scavenging and deposition, and long-range transport using meteorological data from a global circulation model. As an example of the model capabilities, results of simulations of the transport of sulfur from North America and Europe across the North Atlantic Ocean during 30-day periods in January and July are presented. The model predicted that sulfur associated with North American and European anthropogenic sources contributed about equally to atmospheric sulfur deposition in remote areas of the North Atlantic. Oceanic sources of DMS were predicted to contribute to sulfur deposition over some areas of the North Atlantic Ocean. RP LUECKEN, DJ (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 64 TC 17 Z9 19 U1 0 U2 0 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 DEC 20 PY 1991 VL 96 IS D12 BP 22477 EP 22490 DI 10.1029/91JD02137 PG 14 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA GY559 UT WOS:A1991GY55900017 ER PT J AU QABAR, AN STERN, MS WALZ, DA CHIU, JT TIMKOVICH, R WALL, JS KAPP, OH VINOGRADOV, SN AF QABAR, AN STERN, MS WALZ, DA CHIU, JT TIMKOVICH, R WALL, JS KAPP, OH VINOGRADOV, SN TI HIERARCHY OF GLOBIN COMPLEXES - THE QUATERNARY STRUCTURE OF THE EXTRACELLULAR CHLOROCRUORIN OF EUDISTYLIA-VANCOUVERII SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article ID POLYCHAETE TYLORRHYNCHUS-HETEROCHAETUS; AMINO-ACID-SEQUENCE; TRANSMISSION ELECTRON-MICROSCOPY; LUMBRICUS-TERRESTRIS HEMOGLOBIN; NUCLEAR MAGNETIC-RESONANCE; CIRCULAR-DICHROISM; PROPOSED STRUCTURE; POLYPEPTIDE-CHAIN; PROSTHETIC GROUP; MOLECULAR-SIZE C1 WAYNE STATE UNIV,SCH MED,DEPT BIOCHEM,DETROIT,MI 48201. WAYNE STATE UNIV,SCH MED,DEPT PHYSIOL,DETROIT,MI 48201. UNIV ALABAMA,DEPT CHEM,TUSCALOOSA,AL 35487. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637. FU NIDDK NIH HHS [DK 30382, DK 38674]; NIGMS NIH HHS [GM 36264] NR 94 TC 27 Z9 27 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD DEC 20 PY 1991 VL 222 IS 4 BP 1109 EP 1129 DI 10.1016/0022-2836(91)90596-X PG 21 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA GX790 UT WOS:A1991GX79000024 PM 1762147 ER PT J AU Penna, V AF Penna, Vittorio TI WAVE FUNCTION REPRESENTATION FOR THE GENERALIZED EIGENSTATES OF SU(1,1) NONCOMPACT GENERATORS SO MODERN PHYSICS LETTERS B LA English DT Article ID DAMPED HARMONIC-OSCILLATOR AB The SU(1,1) algebra is represented by a two bosonic operator realization. This allows one to obtain a remarkable simplification of the SU(1,1) noncompact generator eigenvectors by representing the Hilbert space basis in terms of two harmonic oscillator wave functions. C1 [Penna, Vittorio] Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. [Penna, Vittorio] Politecn Turin, Dipartimento Fis, I-10129 Turin, Italy. RP Penna, V (reprint author), Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. FU Fondazione Angelo della Riccia FX This work was performed while the author was visiting the Center for Nonlinear Studies (C.N.L.S.) of the Los Alamos National Laboratory. The author is grateful to the C.N.L.S. for its hospitality. He also thanks Professor P. Sodano for stimulating discussions and Professor M. Rasetti for encouragement. This work was partially supported by "Fondazione Angelo della Riccia." NR 10 TC 4 Z9 4 U1 0 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0217-9849 EI 1793-6640 J9 MOD PHYS LETT B JI Mod. Phys. Lett. B PD DEC 20 PY 1991 VL 5 IS 29 BP 1947 EP 1952 DI 10.1142/S0217984991002343 PG 6 WC Physics, Applied; Physics, Condensed Matter; Physics, Mathematical SC Physics GA V28EM UT WOS:000208664100007 ER PT J AU HUBBARD, SR BISHOP, WR KIRSCHMEIER, P GEORGE, SJ CRAMER, SP HENDRICKSON, WA AF HUBBARD, SR BISHOP, WR KIRSCHMEIER, P GEORGE, SJ CRAMER, SP HENDRICKSON, WA TI IDENTIFICATION AND CHARACTERIZATION OF ZINC-BINDING SITES IN PROTEIN-KINASE-C SO SCIENCE LA English DT Article ID SEQUENCE; GENE; ONCOGENE; FINGER; DOMAIN; CELLS; GAL4 AB Metal ion coordination in the regulatory domain of protein kinase C (PKC) is suggested by the conservation of six cysteines and two histidines in two homologous regions found therein. By monitoring x-ray fluorescence from a purified sample of rat PKC-beta-I overexpressed in insect cells, direct evidence has been obtained that PKC-beta-I tightly binds four zinc ions (Zn2+) per molecule. Extended x-ray absorption fine structure (EXAFS) data are best fit by an average Zn2+ coordination of one nitrogen and three sulfur atoms. Of the plausible Zn2+ coordination models, only those featuring nonbridged Zn2+ sites accommodate the EXAFS data and all of the conserved potential ligands. C1 COLUMBIA UNIV, DEPT BIOCHEM & MOLEC BIOPHYS, NEW YORK, NY 10027 USA. SCHERING PLOUGH CORP, BLOOMFIELD, NJ 07003 USA. UNIV CALIF DAVIS, DEPT APPL SCI, DAVIS, CA 95616 USA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV APPL SCI, BERKELEY, CA 94720 USA. RP COLUMBIA UNIV, HOWARD HUGHES MED INST, NEW YORK, NY 10027 USA. NR 37 TC 166 Z9 166 U1 0 U2 6 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 EI 1095-9203 J9 SCIENCE JI Science PD DEC 20 PY 1991 VL 254 IS 5039 BP 1776 EP 1779 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GW316 UT WOS:A1991GW31600038 PM 1763327 ER PT J AU LEVY, AV CROOK, P AF LEVY, AV CROOK, P TI THE EROSION PROPERTIES OF ALLOYS FOR THE CHEMICAL-PROCESSING INDUSTRIES SO WEAR LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON WEAR OF MATERIALS CY APR 07-11, 1991 CL ORLANDO, FL ID PARTICLE AB Several alloys designed for use, or commonly used, in the chemical processing industries were subjected to three forms of erosion, namely solid particle impingement, slurry and cavitation. The test conditions were selected to make it possible to compare directly the behaviors of the alloys subjected to the three types of impact. The solid particle impingement tests were performed in an air blast rig at room temperature using 400-mu-m silicon carbide erodent and at 850-degrees-C using alumina 80-mu-m in diameter. The slurry tests were carried out in a rotating-paddle slurry pot, using a dispersion of alumina particles 80-mu-m in diameter in tap water, agitated by a propeller at the base of the pot. The cavitation erosion tests used a vibratory cavitation unit and the procedures described in ASTM Standard G 32. In the solid particle impingement tests, most of the alloys fell within a narrow performance range, at both room temperature and elevated temperatures. The exception was type 316L stainless steel, which exhibited a much lower erosion rate than the other materials tested at 850-degrees-C. In both the slurry and the cavitation erosion tests, the cobalt-based materials, Haynes(R) alloy 6B and Ultimet(TM) alloy, exhibited low erosion rates than the other alloys tested, suggesting that a low stacking fault energy, f.c.c. structure and/or the tendency of the structure to transform under the action of mechanical stress are beneficial. The slurry erosion caused the least metal wastage, and the solid particle erosion the most, under reasonably comparable test conditions. C1 HAYNES INT,KOKOMO,IN 46902. RP LEVY, AV (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 11 TC 19 Z9 20 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0043-1648 J9 WEAR JI Wear PD DEC 20 PY 1991 VL 151 IS 2 BP 337 EP 350 DI 10.1016/0043-1648(91)90260-2 PG 14 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA GZ313 UT WOS:A1991GZ31300012 ER PT J AU WANG, BQ GENG, GQ LEVY, AV AF WANG, BQ GENG, GQ LEVY, AV TI EFFECT OF MICROSTRUCTURE ON THE EROSION CORROSION OF STEELS SO WEAR LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON WEAR OF MATERIALS CY APR 07-11, 1991 CL ORLANDO, FL ID TEMPERATURE AB 1018 plain carbon steel and 2.25Cr1Mo steel, two commonly used boiler tubing steels, were prepared in five different conditions, i.e. annealed, hot rolled, normalized, quenched-tempered and cold rolled, and then erosion-corrosion tested at room and elevated temperatures using SiO2 particles at V = 20 m s-1 and alpha = 30-degrees. Static and dynamic corrosion (oxidation) tests were also performed. It was determined that the various microstructures caused measurable differences in the metal wastage from erosion at both room and elevated temperatures and by both static and dynamic corrosion. A qualitative relationship was established between the microstructure and the base metal loss. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP WANG, BQ (reprint author), XIAN INST HIGHWAYS,XIAN,SHAANXI,PEOPLES R CHINA. NR 19 TC 2 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0043-1648 J9 WEAR JI Wear PD DEC 20 PY 1991 VL 151 IS 2 BP 351 EP 364 DI 10.1016/0043-1648(91)90261-R PG 14 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA GZ313 UT WOS:A1991GZ31300013 ER PT J AU LIU, YJ LEVY, AV AF LIU, YJ LEVY, AV TI THE INFLUENCE OF TEST PARAMETERS ON MATERIAL WASTAGE IN A FLUIDIZED-BED WEAR TEST RIG SO WEAR LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON WEAR OF MATERIALS CY APR 07-11, 1991 CL ORLANDO, FL AB The characteristics of metal wastage of in-bed heat exchanger tubes are an important problem in the development of fluidized bed combustors. A unique laboratory-scale fluid bed wear tester apparatus was operated at room temperature to study the behavior of aluminum rod-shaped specimens exposed to fluidized erodent particle beds having different ratios of SiO2 to bed material from operating bubbling fluidized bed combustors (BFBCs). The mass and circumferential thickness change distributions of the specimen rods were measured. Only part of the specimen surface was worn, while a deposited layer of bed particles and aluminum was formed on other regions of the cylinder surface that prevented metal wastage. The morphologies and compositions of the deposit layer on several specimen rods were measured. It was determined that the SiO2 constituent in the bed material particles caused the metal wastage, while the calcium compounds in the BFBC bed material contributed to the formation of the deposit layers. The more SiO2 in the bed particles, the more metal wastage occurred. The larger the particle size was, the greater was the metal wastage. Direct metallographic evidence was found that both particle impact erosion and three-body abrasive wear metal wastage mechanisms occurred. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP LIU, YJ (reprint author), TSING HUA UNIV,DEPT MAT SCI & ENGN,BEIJING 100084,PEOPLES R CHINA. NR 10 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0043-1648 J9 WEAR JI Wear PD DEC 20 PY 1991 VL 151 IS 2 BP 365 EP 379 PG 15 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA GZ313 UT WOS:A1991GZ31300014 ER PT J AU LIEBHARD, M LEVY, A AF LIEBHARD, M LEVY, A TI THE EFFECT OF ERODENT PARTICLE CHARACTERISTICS ON THE EROSION OF METALS SO WEAR LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON WEAR OF MATERIALS CY APR 07-11, 1991 CL ORLANDO, FL ID MECHANISM AB The effects of several particle variables on the erosivity of particle streams were determined. They included shape, mass, size impact velocity and feed rate. Tests were carried out at room temperature on 1018 steel using spherical glass beads and angular SiC, neither of which shattered upon impact. The ranges of the test variables, particularly the particle velocities, used in the investigation were considerably different from those reported in the literature. It was determined that the particle size effect was different for spherical and angular particles. The angular particles were much more erosive than the spherical particles. Lower feed rates caused more mass loss than higher feed rates when tests with large differences in the feed rate were compared. RP LIEBHARD, M (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 8 TC 48 Z9 52 U1 1 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0043-1648 J9 WEAR JI Wear PD DEC 20 PY 1991 VL 151 IS 2 BP 381 EP 390 DI 10.1016/0043-1648(91)90263-T PG 10 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA GZ313 UT WOS:A1991GZ31300015 ER PT J AU PACE, E SALME, G WEST, GB AF PACE, E SALME, G WEST, GB TI FINAL-STATE INTERACTION IN QUASI-ELASTIC ELECTRON-SCATTERING BY NUCLEI AND Y-SCALING SO PHYSICS LETTERS B LA English DT Article ID MOMENTUM DISTRIBUTION; NEUTRON-SCATTERING; QUANTUM LIQUIDS; HE-3 AB Using the concept of y scaling it is shown in a many-body, non-relativistic framework that for local, square-integrable interactions the inclusive response in the region of the quasi-elastic peak approaches at high momentum transfer the expression obtained in the plane wave impulse approximation. C1 IST NAZL FIS NUCL, SEZ TOR VERGATA, I-00173 ROME, ITALY. IST SUPER SANITA, IST NAZL FIS NUCL, PHYS LAB, SEZ SANITA, I-00161 ROME, ITALY. UNIV CALIF LOS ALAMOS SCI LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. RP UNIV ROMA TOR VERGATA, DIPARTIMENTO FIS, VIA E CARNEVALE, I-00173 ROME, ITALY. OI Salme', Giovanni/0000-0002-9209-3464 NR 28 TC 32 Z9 32 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD DEC 19 PY 1991 VL 273 IS 3 BP 205 EP 210 DI 10.1016/0370-2693(91)91672-I PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GX504 UT WOS:A1991GX50400003 ER PT J AU LU, HJ DEMELO, CARS AF LU, HJ DEMELO, CARS TI DRESSED SKELETON EXPANSION AND THE COUPLING SCALE AMBIGUITY PROBLEM SO PHYSICS LETTERS B LA English DT Article ID INVARIANT PERTURBATION-THEORY; QUANTUM CHROMODYNAMICS; QCD; DEPENDENCE AB We present the dressed skeleton expansion (DSE) as a method for perturbative calculations in quantum field theories without the scale ambiguity problem. We illustrate the application of the DSE method to the two-particle elastic scattering amplitude in phi(6)3 theory, and compare this method with the usual perturbative expansion, combined with scale setting prescriptions. C1 STANFORD UNIV,DEPT APPL PHYS,STANFORD,CA 94305. RP LU, HJ (reprint author), STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 24 TC 14 Z9 14 U1 0 U2 3 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 DEC 19 PY 1991 VL 273 IS 3 BP 260 EP 267 DI 10.1016/0370-2693(91)91681-K PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GX504 UT WOS:A1991GX50400012 ER PT J AU SONG, JS BULLOCK, RM CREUTZ, C AF SONG, JS BULLOCK, RM CREUTZ, C TI INTRINSIC BARRIERS TO ATOM TRANSFER (ABSTRACTION) PROCESSES - SELF-EXCHANGE RATES FOR CP(CO)3M. RADICAL CP(CO)3M-X HALOGEN COUPLES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID FLASH-PHOTOLYSIS; PHOTOCHEMISTRY; SUBSTITUTION; BOND C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RI Bullock, R. Morris/L-6802-2016 OI Bullock, R. Morris/0000-0001-6306-4851 NR 26 TC 37 Z9 37 U1 0 U2 0 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 DEC 18 PY 1991 VL 113 IS 26 BP 9862 EP 9864 DI 10.1021/ja00026a029 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA GW356 UT WOS:A1991GW35600029 ER PT J AU YU, KM LILIENTALWEBER, Z AF YU, KM LILIENTALWEBER, Z TI LATTICE SITE LOCATIONS OF EXCESS ARSENIC ATOMS IN GALLIUM-ARSENIDE GROWN BY LOW-TEMPERATURE MOLECULAR-BEAM EPITAXY SO APPLIED PHYSICS LETTERS LA English DT Article ID GAAS AB The excess As atoms present in as-grown GaAs buffer layers grown by molecular beam epitaxy at low substrate temperature (approximately 200-degrees-C) was measured by particle induced x-ray emission to be approximately 4 X 10(20) atoms/cm3. The lattice site location of these excess As atoms in the layer was studied by ion channeling methods. Our results strongly suggested that the excess As atoms are located in an interstitial position close to the substitutional As atoms with a projected displacement approximately 0.3 angstrom into the <110> channel. These results are consistent with the <111> split interstitials model suggested from TEM results. After annealing at 600-degrees-C these excess As atoms coalesce forming As precipitates. RP YU, KM (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,CTR ADV MAT,BERKELEY,CA 94720, USA. RI Yu, Kin Man/J-1399-2012; Liliental-Weber, Zuzanna/H-8006-2012 OI Yu, Kin Man/0000-0003-1350-9642; NR 13 TC 17 Z9 17 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 DEC 16 PY 1991 VL 59 IS 25 BP 3267 EP 3269 DI 10.1063/1.105726 PG 3 WC Physics, Applied SC Physics GA GV079 UT WOS:A1991GV07900022 ER PT J AU ROCKWOOD, AL BUSMAN, M SMITH, RD AF ROCKWOOD, AL BUSMAN, M SMITH, RD TI COULOMBIC EFFECTS IN THE DISSOCIATION OF LARGE HIGHLY CHARGED IONS SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES LA English DT Article ID ELECTROSPRAY-IONIZATION; MASS-SPECTROMETRY; MOLECULES; PROTEINS AB Electrospray ionization has been shown to produce highly charged ions for classes of very large molecules. These ions (at relatively low m/z) can be generally activated and dissociated with good efficiency. The effect of coulombic interactions on the stability of large highly charged ions is discussed for a model based on evenly distributed charges for a linear polymer, i.e. a "charges on a string" model. Both activation energy for dissociation and net thermodynamic stability are considered. As a result of the long-range nature of the coulomb potential and the short-range nature of chemical bonding interactions, calculations predict a large coulombic effect on thermodynamic stability, and a somewhat smaller effect on activation energy for ion fragmentation. The most important consequence of this analysis is that as the charge of an ion increases, it should become easier to dissociate. Experimental support for the reduced stability of the higher charged ions is cited. Another consequence of coulombic interactions is that we expect ions with high charge to give fragmentation patterns different from those of ions with low charge. As charge increases, increased rates of dissociation are expected for sites towards the center of large molecules where the coulombic forces are greatest. Limitations of the models and future directions for more rigorous calculations are discussed. The present results are discussed within the context of preliminary experimental results. C1 PACIFIC NW LAB, DEPT CHEM SCI, RICHLAND, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 24 TC 86 Z9 86 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1176 J9 INT J MASS SPECTROM JI Int. J. Mass Spectrom. Ion Process. PD DEC 16 PY 1991 VL 111 BP 103 EP 129 DI 10.1016/0168-1176(91)85051-M PG 27 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA GY612 UT WOS:A1991GY61200008 ER PT J AU SMITH, JB MIESBAUER, LR LEEDS, J SMITH, DL LOO, JA SMITH, RD EDMONDS, CG AF SMITH, JB MIESBAUER, LR LEEDS, J SMITH, DL LOO, JA SMITH, RD EDMONDS, CG TI MASS-SPECTROMETRIC ANALYSIS OF LENS BETA-CRYSTALLINS SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES LA English DT Article ID ELECTROSPRAY IONIZATION; PHOSPHORYLATION SITES; CATARACT FORMATION; ALPHA-CRYSTALLIN; ASCORBIC-ACID; BOVINE LENS; PROTEINS; SEQUENCE; CHAIN; TRANSGLUTAMINASE AB A combination of electrospray ionization mass spectrometry (ESIMS), fast atom bombardment mass spectrometry (FABMS), and sodium dodecylsulfate-polyacrylamide gel electrophoresis (SDS-PAGE) was used to determine the homogeneity of chromatographic fractions of beta-crystallins, separated by reversed-phase HPLC. The molecular weight of the major component of beta-crystallins, beta-B2, was found by ESIMS to be 23 215, in agreement with the accepted value of 23 209. The practical utility of improved resolution and accuracy of ESIMS relative to SDS-PAGE for identifying proteins is discussed. The component beta-B2 was found in more than one HPLC fraction, suggesting that it migrates through the HPLC column aggregated with itself or other beta-crystallins. Several proteins with different molecular weights were found to be unique to each of the two classes of beta-crystallins. Tryptic digest of the major HPLC fractions were analyzed by FABMS, on-line HPLC continuous-flow FABMS, and FABMS-MS to give detailed information about the primary structure of beta-B2. Peptides related to all but one portion of the proposed amino acid sequence of beta-B2 were found in the tryptic digest, suggesting that the proposed sequence is correct. On-line HPLC continuous-flow FABMS analysis of the proteolytic digest was particularly attractive because it gave a nearly complete peptide molecular weight map in 20 min. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP SMITH, JB (reprint author), PURDUE UNIV, DEPT MED CHEM & PHARMACOGNOSY, W LAFAYETTE, IN 47907 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 36 TC 10 Z9 10 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1176 J9 INT J MASS SPECTROM JI Int. J. Mass Spectrom. Ion Process. PD DEC 16 PY 1991 VL 111 BP 229 EP 245 DI 10.1016/0168-1176(91)85057-S PG 17 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA GY612 UT WOS:A1991GY61200014 ER PT J AU HETTICH, RL BUCHANAN, MV AF HETTICH, RL BUCHANAN, MV TI MATRIX-ASSISTED LASER DESORPTION FOURIER-TRANSFORM MASS-SPECTROMETRY FOR THE STRUCTURAL EXAMINATION OF MODIFIED NUCLEIC-ACID CONSTITUENTS SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES LA English DT Article ID COVALENT DNA-BINDING; P-32-POSTLABELING TEST; AROMATIC CARCINOGENS; METHYLATING AGENTS; CYCLOBUTANE DIMERS; CHEMICALS INVIVO; IONIZATION; OLIGOSACCHARIDES; OLIGONUCLEOTIDES; NUCLEOSIDES AB Laser desorption Fourier transform mass spectrometry (LDFTMS) can be used for the structural characterization of modified nucleic acid constituents. Laser desorption of these polar non-volatile compounds generates characteristic negative ions including abundant (M-H)- ions in most cases. The accurate mass measurement and ion manipulation techniques available with FTMS provide detailed structural information for the identification of modified nucleic acid constituents such as amino-polycyclic aromatic hydrocarbon adducts of guanine at the isomeric level. Matrix-assisted laser desorption was required for the generation of abundant (M-H)- ions as well as fragment ions of modified nucleotides and oligonucleotides. Examination of fragment ions from these compounds provided not only adduct identification and location but also sequence information and isomeric differentiation for most small oligonucleotides. In order to investigate the application of this instrumental technique to larger oligonucleotides, experiments were designed to examine the kinetic energy distributions of ions generated by matrix-assisted laser desorption and to evaluate methods of improving the trapping efficiencies. Initial experiments indicated that ions at m/z < 600 have kinetic energies less than 5 eV; however, the use of simple retarding fields did not significantly affect trapping efficiencies, implying that the space-charged ion cloud generated by matrix-assisted laser desorption was relatively unaffected by small retarding fields (less than 10 V) RP HETTICH, RL (reprint author), OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831, USA. RI Hettich, Robert/N-1458-2016 OI Hettich, Robert/0000-0001-7708-786X NR 29 TC 52 Z9 52 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1176 J9 INT J MASS SPECTROM JI Int. J. Mass Spectrom. Ion Process. PD DEC 16 PY 1991 VL 111 BP 365 EP 380 DI 10.1016/0168-1176(91)85065-T PG 16 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA GY612 UT WOS:A1991GY61200022 ER PT J AU TESANOVIC, Z HERBUT, IF AF TESANOVIC, Z HERBUT, IF TI A SUPERLATTICE OF 2D ELECTRONS IN THE FRACTIONAL QUANTUM HALL-EFFECT REGIME - THE EFFECTS OF TUNNELING BETWEEN DIFFERENT LAYERS SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID STRONG-MAGNETIC-FIELD; EXCITATIONS; SYSTEM AB The superlattice of parallel two-dimensional electron layers in a strong perpendicular magnetic field with small tunnelling between the layers is considered. For simple fractional filling factors in each layer we propose a new variational ground state. We study the collective excitation spectrum in single-mode approximation and make a conjecture on the offset of the fractional quantum Hall effect when the tunnelling becomes sufficiently strong. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP TESANOVIC, Z (reprint author), JOHNS HOPKINS UNIV,DEPT PHYS & ASTRON,BALTIMORE,MD 21218, USA. NR 12 TC 2 Z9 2 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 DEC 16 PY 1991 VL 3 IS 50 BP 9975 EP 9980 DI 10.1088/0953-8984/3/50/003 PG 6 WC Physics, Condensed Matter SC Physics GA GW737 UT WOS:A1991GW73700003 ER PT J AU PALATHINGAL, JC ASOKAKUMAR, P LYNN, KG POSADA, Y WU, XY AF PALATHINGAL, JC ASOKAKUMAR, P LYNN, KG POSADA, Y WU, XY TI SINGLE-QUANTUM ANNIHILATION OF POSITRONS WITH SHELL-BOUND ATOMIC ELECTRONS SO PHYSICAL REVIEW LETTERS LA English DT Article AB The single-quantum annihilation of positrons has been studied experimentally with a positron beam and a thin lead target, at energies 1 MeV and higher. Spectral peaks corresponding to the K, L, and M shells have been resolved and observed distinctly for the first time. The shell ratios L/K and M/K have been determined. An analysis of the L peak has yielded the (LII + III)/L ratio. The first measurements of the directional distributions of the annihilation quanta of the three individual electron shells are also reported. The results are in agreement with theory. They also point out the potential for applying the phenomenon to the development of a tunable, highly directional gamma-ray source. C1 BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. RP UNIV PUERTO RICO, DEPT PHYS, MAYAGUEZ, PR 00708 USA. NR 16 TC 10 Z9 10 U1 3 U2 4 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 DEC 16 PY 1991 VL 67 IS 25 BP 3491 EP 3494 DI 10.1103/PhysRevLett.67.3491 PG 4 WC Physics, Multidisciplinary SC Physics GA GV083 UT WOS:A1991GV08300008 ER PT J AU GOLDIN, GA MENIKOFF, R SHARP, DH AF GOLDIN, GA MENIKOFF, R SHARP, DH TI QUANTUM VORTEX CONFIGURATIONS IN 3 DIMENSIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID DIFFEOMORPHISM-GROUPS; CURRENT ALGEBRAS; VORTICES; REPRESENTATIONS; STATISTICS; PARTICLES; SPACE AB We examine the kinematics of quantum vortex configurations in three-dimensional space for an ideal incompressible fluid. The permitted quantum configurations are shown to be surfaces of vorticity, characterized topologically not only by their knottedness, but also by additional global properties such as twists and holes. Our results, obtained by representing an infinite-dimensional group of diffeomorphisms, contradict conclusions reached by approximating the infinite-dimensional system with finitely many degrees of freedom. C1 RUTGERS STATE UNIV,DEPT PHYS,NEW BRUNSWICK,NJ 08903. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP GOLDIN, GA (reprint author), RUTGERS STATE UNIV,DEPT MATH,NEW BRUNSWICK,NJ 08903, USA. NR 24 TC 19 Z9 20 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 DEC 16 PY 1991 VL 67 IS 25 BP 3499 EP 3502 DI 10.1103/PhysRevLett.67.3499 PG 4 WC Physics, Multidisciplinary SC Physics GA GV083 UT WOS:A1991GV08300010 ER PT J AU NAGAYAMA, Y MCGUIRE, KM BITTER, M CAVALLO, A FREDRICKSON, ED HILL, KW HSUAN, H JANOS, A PARK, W TAYLOR, G YAMADA, M AF NAGAYAMA, Y MCGUIRE, KM BITTER, M CAVALLO, A FREDRICKSON, ED HILL, KW HSUAN, H JANOS, A PARK, W TAYLOR, G YAMADA, M TI ANALYSIS OF SAWTOOTH OSCILLATIONS USING SIMULTANEOUS MEASUREMENT OF ELECTRON-CYCLOTRON EMISSION IMAGING AND X-RAY TOMOGRAPHY ON TFTR SO PHYSICAL REVIEW LETTERS LA English DT Article ID TOKAMAK; PLASMAS; SYSTEM AB High-resolution electron cyclotron emission and x-ray image reconstructions have been made simultaneously during the sawtooth crash in the fast rotating plasma with neutral beam injection heating on TFTR. The measured x-ray emission is identified as metal impurity radiation. The results suggest that the sawtooth crash is a full reconnection process for the TFTR sawteeth. The crescent-shaped ''hot spot'' in the x-ray emissivity is found not to represent flux surfaces. New features are observed during the sawtooth crash, such as an oval-shaped hot spot and a cooler region between the island and the hot spot. C1 UNIV TOKYO,TOKYO 113,JAPAN. RP NAGAYAMA, Y (reprint author), PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Yamada, Masaaki/D-7824-2015 OI Yamada, Masaaki/0000-0003-4996-1649 NR 18 TC 41 Z9 41 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 DEC 16 PY 1991 VL 67 IS 25 BP 3527 EP 3530 DI 10.1103/PhysRevLett.67.3527 PG 4 WC Physics, Multidisciplinary SC Physics GA GV083 UT WOS:A1991GV08300017 ER PT J AU VOHRA, YK AKELLA, J AF VOHRA, YK AKELLA, J TI 5F BONDING IN THORIUM METAL AT EXTREME COMPRESSIONS - PHASE-TRANSITIONS TO 300 GPA SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGH-PRESSURE; CRYSTAL-STRUCTURE; ELECTRONIC-STRUCTURE; CERIUM; PRASEODYMIUM; DIFFRACTION; EQUATION; STATE AB The 5f element thorium has been studied in a diamond-anvil cell to pressures of 300 +/- 8 GPa (volume fraction V/V0 = 0.40) at 300 K by energy-dispersive x-ray diffraction using a synchrotron source and platinum pressure standard. Thorium undergoes a phase transition from its ambient fcc phase to a body-centered-tetragonal (bct) phase near 100 GPa. This bct high-pressure phase of thorium is similar to the one found previously in the 4f lanthanide element cerium above 12 GPa. We suggest that the 5f band which lies above the Fermi energy in thorium at ambient conditions is occupied at megabar pressures and significantly contributes to bonding. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP VOHRA, YK (reprint author), CORNELL UNIV,ITHACA,NY 14853, USA. NR 21 TC 68 Z9 69 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD DEC 16 PY 1991 VL 67 IS 25 BP 3563 EP 3566 DI 10.1103/PhysRevLett.67.3563 PG 4 WC Physics, Multidisciplinary SC Physics GA GV083 UT WOS:A1991GV08300026 ER PT J AU ROJO, AG LEGGETT, AJ AF ROJO, AG LEGGETT, AJ TI SIGN OF THE COUPLING BETWEEN T-VIOLATING GROUND-STATES IN 2ND-ORDER PERTURBATION-THEORY SO PHYSICAL REVIEW LETTERS LA English DT Article ID SUPERCONDUCTIVITY; PARTICLES AB We consider the coupling between two T-violating systems by a non-T-violating interaction. We show that the configuration in which the signs of the T breaking in the two systems are opposite generally has lower energy. In the context of those theories of the cuprate superconductors which postulate breaking of T invariance in the CuO2 planes, a crude estimate of the Coulomb-induced ''antiferromagnetic'' coupling for reasonable domain sizes indicates that it is an ''edge'' effect but at least competitive with the ''ferromagnetic'' one due to Josephson and magnetic effects. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. RP ROJO, AG (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 20 TC 18 Z9 18 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD DEC 16 PY 1991 VL 67 IS 25 BP 3614 EP 3617 DI 10.1103/PhysRevLett.67.3614 PG 4 WC Physics, Multidisciplinary SC Physics GA GV083 UT WOS:A1991GV08300039 ER PT J AU HAYDEN, SM AEPPLI, G OSBORN, R TAYLOR, AD PERRING, TG CHEONG, SW FISK, Z AF HAYDEN, SM AEPPLI, G OSBORN, R TAYLOR, AD PERRING, TG CHEONG, SW FISK, Z TI HIGH-ENERGY SPIN-WAVES IN LA2CUO4 SO PHYSICAL REVIEW LETTERS LA English DT Article ID ANTIFERROMAGNET; DYNAMICS AB Time-of-flight spectroscopy using neutrons produced by a spallation source is used to measure the one-magnon scattering throughout the Brillouin zone for La2CuO4. The zone-boundary magnons have an energy HBAR omega(ZB) = 0.312 +/- 0.005 eV and are good eigenstates of the quantum Heisenberg Hamiltonian in that they possess lifetimes > 10/omega. A multiplicative renormalization of the overall frequency scale of classical spin-wave theory accounts for the quantum effects in the one-magnon spectrum. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV OXFORD,CLARENDON LAB,OXFORD,ENGLAND. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP HAYDEN, SM (reprint author), UNIV BRISTOL,HH WILLS PHYS LAB,BRISTOL BS8 1TL,AVON,ENGLAND. RI Osborn, Raymond/E-8676-2011; Hayden, Stephen/F-4162-2011 OI Osborn, Raymond/0000-0001-9565-3140; Hayden, Stephen/0000-0002-3209-027X NR 19 TC 158 Z9 158 U1 4 U2 17 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 DEC 16 PY 1991 VL 67 IS 25 BP 3622 EP 3625 DI 10.1103/PhysRevLett.67.3622 PG 4 WC Physics, Multidisciplinary SC Physics GA GV083 UT WOS:A1991GV08300041 ER PT J AU BARONE, V PENNA, V SODANO, P AF BARONE, V PENNA, V SODANO, P TI SU(1, 1) SPECTRUM GENERATING ALGEBRA FOR THE QUANTUM DAMPED HARMONIC-OSCILLATOR SO PHYSICS LETTERS A LA English DT Article AB Using the spectrum generating algebra method, we find the complete set of exact eigenstates for the quantum damped harmonic oscillator. The states which diagonalize our quantum mechanical model Hamiltonian are the Lindblad-Nagel states which provide an unitary irreducible representation of the SU (1, 1) algebra. We derive an integral representation of the Lindblad-Nagel states in terms of SU (1, 1) generalized coherent states. We discuss possible applications of this formula. C1 UNIV PERUGIA,IST NAZL FIS NUCL SEZ,I-06100 PERUGIA,ITALY. UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP BARONE, V (reprint author), UNIV PERUGIA,I-06100 PERUGIA,ITALY. NR 18 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD DEC 16 PY 1991 VL 161 IS 1 BP 41 EP 44 DI 10.1016/0375-9601(91)90541-F PG 4 WC Physics, Multidisciplinary SC Physics GA GX018 UT WOS:A1991GX01800009 ER PT J AU BARBEE, TW COHEN, ML PENN, DR AF BARBEE, TW COHEN, ML PENN, DR TI LIMITATIONS ON A COMBINED PHONON-NON-PHONON MECHANISM FOR SUPERCONDUCTIVITY IN BI2SR2CA1CU2OX SO PHYSICS LETTERS A LA English DT Article ID CU-O SYSTEM AB Despite the large number of theories proposed to explain high-temperature superconductivity, no clear explanation of its origin exists. Experimental data such as the isotope effect alpha and the gap ratio 2-DELTA/k(B)T(c) can be used to constrain possible models for high-temperature superconductivity. We consider a class of models which contain contributions to pairing from phonons and also from another unspecified boson, and place limitations on such models in light of these experimental data and recent results derived from photoemission data for Bi2Sr2Ca1Cu2Ox. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. NATL INST STAND & TECHNOL,DIV RADIAT PHYS,GAITHERSBURG,MD 20899. RP BARBEE, TW (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,L-412,POB 808,LIVERMORE,CA 94550, USA. NR 15 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD DEC 16 PY 1991 VL 161 IS 1 BP 85 EP 88 DI 10.1016/0375-9601(91)90551-I PG 4 WC Physics, Multidisciplinary SC Physics GA GX018 UT WOS:A1991GX01800019 ER PT J AU ERDEMIR, A SWITALA, M WEI, R WILBUR, P AF ERDEMIR, A SWITALA, M WEI, R WILBUR, P TI A TRIBOLOGICAL INVESTIGATION OF THE GRAPHITE-TO-DIAMOND-LIKE BEHAVIOR OF AMORPHOUS-CARBON FILMS ION-BEAM DEPOSITED ON CERAMIC SUBSTRATES SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA ID FRICTION; COATINGS AB A tribological investigation was conducted on the graphite-to-diamond-like behavior of hard carbon films produced on SiC, Si3N4 and ZrO2 substrates by ion beam deposition. Friction tests were performed on a ball-on-disk machine with pairs of various ceramic balls and disks coated with hard carbon films in dry and humid air, argon and N2. The friction coefficients of carbon films sliding against Si3N4 and sapphire balls were in the range 0.02-0.04 in N2 and argon, but were significantly higher (about 0.15) in humid air. The wear rates of ceramic disks coated with carbon films were unmeasurable, and, depending on the test environment, the wear rates of counterface ceramic balls were reduced by two to four orders of magnitude below those of balls slid against uncoated ceramic disks. Graphite disks were also tested, to obtain friction data that can help us to understand the graphite-to-diamond-like tribological behavior of carbon films. Micro laser Raman spectroscopy and scanning electron microscopy were used to analyze the structure and chemistry of worn surfaces and to elucidate the graphite- and diamond-like tribological behavior of amorphous carbon films. C1 FRANKLIN & MARSHALL COLL,DEPT PHYS,LANCASTER,PA 17604. COLORADO STATE UNIV,DEPT MECH ENGN,FT COLLINS,CO 80523. RP ERDEMIR, A (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. NR 12 TC 126 Z9 126 U1 1 U2 13 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD DEC 16 PY 1991 VL 50 IS 1 BP 17 EP 23 DI 10.1016/0257-8972(91)90187-2 PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA GX593 UT WOS:A1991GX59300004 ER PT J AU LEE, TT YEUNG, ES AF LEE, TT YEUNG, ES TI FACILITATING DATA TRANSFER AND IMPROVING PRECISION IN CAPILLARY ZONE ELECTROPHORESIS WITH MIGRATION INDEXES SO ANALYTICAL CHEMISTRY LA English DT Article ID ELECTROKINETIC CHROMATOGRAPHY; LIQUID-CHROMATOGRAPHY; SEPARATION EFFICIENCY; ELECTROOSMOTIC FLOW; PH; RESOLUTION; MOBILITY AB A migration index and an adjusted migration index for capillary zone electrophoresis (CZE) are introduced. Use of the indices makes possible the transfer of migration data obtained with different constant or gradient potentials. Results from capillaries with distinct lengths, inner diameters, and zeta potentials can also be related. Furthermore, improvement in the precision of migration data is realized. The performances of the migration indices, migration time, relative migration and electrophoretic mobility are compared in typical analytical runs, and the relative merits and drawbacks of each indicator are discussed. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. RP YEUNG, ES (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 41 TC 45 Z9 47 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD DEC 15 PY 1991 VL 63 IS 24 BP 2842 EP 2848 DI 10.1021/ac00024a007 PG 7 WC Chemistry, Analytical SC Chemistry GA GU987 UT WOS:A1991GU98700007 ER PT J AU ANDERSON, KB WINANS, RE AF ANDERSON, KB WINANS, RE TI NATURE AND FATE OF NATURAL RESINS IN THE GEOSPHERE .1. EVALUATION OF PYROLYSIS-GAS CHROMATOGRAPHY MASS-SPECTROMETRY FOR THE ANALYSIS OF NATURAL RESINS AND RESINITES SO ANALYTICAL CHEMISTRY LA English DT Article ID MAGNETIC-RESONANCE SPECTROSCOPY; PULP-MILL EFFLUENT; BIOLOGICAL DETOXIFICATION; MORTIERELLA-ISABELLINA; BOTANICAL ORIGIN; MEXICAN AMBERS; IR ANALYSES; C-13 NMR; DOMINICAN; BIODEGRADATION AB The application of pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) to the analysis of natural resins and resinites based on diterpenoid carboxylic acids has been investigated, in order to determine the usefulness of this technique for the analysis of these materials. It has been found that Py-GC/MS analyses using simultaneous pyrolytic methylation (SPM) provide an accurate indication of the composition of these materials, except with respect to compounds with an additional hydroxy and/or carbonyl functionality. Resin acid methyl esters (RAMES) are efficiently produced in situ by copyrolysis with tetramethylammonium hydroxide. Pyrolysis did not result in significant thermal degradation or isomerization of the RAMES characterized in this study. Some dehydration of RAME alcohols is observed however, and both hydroxy- and carbonyl-containing RAMES undergo undesirable side reactions with the methylating reagent, which results in the formation of nitrogen-containing products. The optimum pyrolysis temperature for low- to moderate-rank resinites using the conditions employed in this study was found to be 480-degrees-C. Py-GC/MS analyses without in situ methylation were found to provide generally less adequate data for structural and compositional analyses. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP ANDERSON, KB (reprint author), AMOCO OIL CO,BLDG 700,MAIL STN H-9,POB 3011,NAPERVILLE,IL 60566, USA. NR 32 TC 122 Z9 123 U1 2 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD DEC 15 PY 1991 VL 63 IS 24 BP 2901 EP 2908 DI 10.1021/ac00024a019 PG 8 WC Chemistry, Analytical SC Chemistry GA GU987 UT WOS:A1991GU98700019 ER PT J AU HOLT, BD ABRAJANO, TA AF HOLT, BD ABRAJANO, TA TI CHEMICAL AND CARBON ISOTOPIC ALTERATION OF ORGANIC-MATTER DURING STEPPED COMBUSTION SO ANALYTICAL CHEMISTRY LA English DT Article ID CHONDRITE; KEROGEN AB Stepped combustion was examined for its applicability to the resolution of isotopically distinct carbon components of complex organic matter such as kerogen. A kerogen (isolated from Green River shale), a standard oil (NBS-22), and two single-component, pure, organic compounds (sucrose and pentadecane) were subjected to a modified procedure of stepped combustion. The modified procedure was designed to test for completeness of reaction at an arbitrarily selected relatively low combustion temperature (225-degrees-C) in repeated periods of heating. In sequential periods at 225-degrees-C, the rate of carbon release as CO2 and CO generally diminished from several percent C per hour to near-zero percent C per hour, over a combined combustion time of up to 38 h. Nearly half of the carbon in all four materials remained as charred, oxidation-resistant residues that were readily combusted at 500-degrees-C. The carbon fractions released at 225 and 500-degrees-C, respectively, were isotopically relatable to the chemical alteration of the organic substances that occurred during the analytical process, rather than to isotopically distinct components in the original materials. RP HOLT, BD (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,GEOSCI GRP,ARGONNE,IL 60439, USA. NR 12 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD DEC 15 PY 1991 VL 63 IS 24 BP 2973 EP 2978 DI 10.1021/ac00024a032 PG 6 WC Chemistry, Analytical SC Chemistry GA GU987 UT WOS:A1991GU98700032 ER PT J AU LEY, RD APPLEGATE, LA FRY, RJM SANCHEZ, AB AF LEY, RD APPLEGATE, LA FRY, RJM SANCHEZ, AB TI PHOTOREACTIVATION OF ULTRAVIOLET RADIATION-INDUCED SKIN AND EYE TUMORS OF MONODELPHIS-DOMESTICA SO CANCER RESEARCH LA English DT Article ID INDUCED PYRIMIDINE DIMERS; ANCHORAGE-INDEPENDENT GROWTH; LIGHT-INDUCED TRANSFORMATION; 6-4 PHOTOPRODUCTS; ACTION SPECTRA; CYCLOBUTANE DIMERS; HUMAN-CELLS; DNA; EPIDERMIS; PHOTOREPAIR AB Chronic exposure of the opossum Monodelphis domestica to UV radiation (UVR) leads to the formation of cutaneous and corneal tumors. Groups of shaved opossums were exposed 3 times/week to: (a) UVR alone; (b) UVR followed immediately by 1 h of photoreactivating light (PRL) (320-700 nm); (c) 1 h of PRL followed by UVR, and (d) 1 h of PRL alone. Exposures were terminated after 70 weeks of treatment. Analysis of data plotted as probability of tumor formation versus weeks from first exposure shows that post-UVR exposure to PRL significantly (P < 0.005) delayed the time to appearance of cutaneous tumors from a 50% probability of tumor formation at 73 weeks for those animals exposed to UVR alone to 128 weeks for those animals exposed to PRL after UVR. Pre-UVR exposure to PRL delayed the appearance of tumors by 6 weeks when compared to the UVR alone group, but the difference between the two groups was not statistically significant. The yield (number of tumors/surviving animal) of cutaneous tumors at 70 and 110 weeks following initiation of treatments also was significantly less in those animals exposed to PRL after, but not before, UVR. Based on the specificity of the PR repair pathway to act only on pyrimidine dimers, these results suggest that dimers are involved in the induction of cutaneous tumors. The results obtained with the induction of corneal tumors are more difficult to interpret. While exposure to PRL significantly delayed the appearance of corneal tumors, the magnitude of the effect was the same regardless of whether the PRL was given before or after each UVR exposure. C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. RP LEY, RD (reprint author), LOVELACE FDN MED EDUC & RES,CTR PHOTOMED,ALBUQUERQUE,NM 87108, USA. FU NIAMS NIH HHS [AR35442] NR 35 TC 57 Z9 57 U1 0 U2 3 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD DEC 15 PY 1991 VL 51 IS 24 BP 6539 EP 6542 PG 4 WC Oncology SC Oncology GA GU416 UT WOS:A1991GU41600007 PM 1742727 ER PT J AU TREBITZ, AS AF TREBITZ, AS TI TIMING OF SPAWNING IN LARGEMOUTH BASS - IMPLICATIONS OF AN INDIVIDUAL-BASED MODEL SO ECOLOGICAL MODELLING LA English DT Article ID MICROPTERUS-SALMOIDES; SMALLMOUTH BASS; PREY SELECTION; REPRODUCTIVE SUCCESS; LEPOMIS-MACROCHIRUS; PLANKTIVOROUS FISH; 1ST-YEAR SURVIVAL; APPARENT SIZE; BODY SIZE; GROWTH AB Timing of reproduction can help adjust the lifecycle of a species to coincide with biotic and abiotic conditions favorable for the growth and survival of its young. In fishes, factors related to the selection of spawning time include temperature regime, abundance and distribution of prey, and density-dependent feedbacks between population size, growth, survival, and reproduction. An individual-based model for young-of-year largemouth bass (Micropterus salmoides) is presented. The model is then used to explore how these factors interact to determine optimal spawning time, defined here as that spawning time for which the total biomass of a cohort of bass at one year of age is maximized. When food intake per individual was assumed to be independent of population size, a broad peak in total cohort biomass occurred at intermediate spawning temperatures. With the addition of density dependence in food intake, a nearly constant total biomass was attained across a range of prescribed spawning temperatures. When largemouth bass spawned at different times within a year competed for a common food resource, those spawned earliest tended to produce the greatest total biomass. Fish representing a variety of spawning strategies were able to coexist over 15 simulated generations, however, because the number of offspring produced by any one strategy was limiting by the availability of prey of suitable size. Simulation results argue that recruitment success should not be assessed until well after young begin feeding, as density-dependent factors will determine the relative success of cohorts that survive adverse environmental conditions. C1 OAK RIDGE NATL LAB, DIV ENVIRONM SCI, OAK RIDGE, TN 37831 USA. NR 71 TC 23 Z9 23 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3800 EI 1872-7026 J9 ECOL MODEL JI Ecol. Model. PD DEC 15 PY 1991 VL 59 IS 3-4 BP 203 EP 227 DI 10.1016/0304-3800(91)90178-4 PG 25 WC Ecology SC Environmental Sciences & Ecology GA HA776 UT WOS:A1991HA77600003 ER PT J AU MCGUIRE, EJ AF MCGUIRE, EJ TI THE PROTON STOPPING POWER OF ALUMINUM AND NICKEL IONS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID BORN-APPROXIMATION; SHELL CORRECTIONS; PLASMAS; TARGETS; AL AB Results are presented for the stopping power for protons of 1-100 MeV energy by Ni+(n) ions with 0 less-than-or-equal-to n less-than-or-equal-to 26. Older Al stopping power results are re-examined to better estimate and reduce the error, new asymptotic stopping power parameters are obtained from improved Al and Ni ion optical oscillator strengths, and Ni stopping power results are presented with an estimated accuracy of 20%. RP MCGUIRE, EJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, 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 DEC 15 PY 1991 VL 70 IS 12 BP 7213 EP 7216 DI 10.1063/1.349764 PG 4 WC Physics, Applied SC Physics GA GW586 UT WOS:A1991GW58600001 ER PT J AU LI, Z CHAN, SK GRIMSDITCH, MH ZOUBOULIS, ES AF LI, Z CHAN, SK GRIMSDITCH, MH ZOUBOULIS, ES TI THE ELASTIC AND ELECTROMECHANICAL PROPERTIES OF TETRAGONAL BATIO3 SINGLE-CRYSTALS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID TEMPERATURE-DEPENDENCE; SCATTERING; CONSTANTS AB From velocity of sound measurements, obtained using Brillouin scattering and ultrasound techniques, the elastic and piezoelectric constants at room temperature have been determined on high-quality monodomain tetragonal BaTiO3 single crystals. The elastic constants are in fair agreement with those measured previously by the low-frequency equivalent circuit method. However, the electromechanical properties are significantly different. It is suggested that high frequency relaxation may have an influence on the measurements of those parameters. RP LI, Z (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 18 TC 64 Z9 66 U1 1 U2 16 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD DEC 15 PY 1991 VL 70 IS 12 BP 7327 EP 7332 DI 10.1063/1.349751 PG 6 WC Physics, Applied SC Physics GA GW586 UT WOS:A1991GW58600018 ER PT J AU HAUGSTAD, G CAPRILE, C FRANCIOSI, A WIELICZKA, DM OLSON, CG AF HAUGSTAD, G CAPRILE, C FRANCIOSI, A WIELICZKA, DM OLSON, CG TI A PHOTOEMISSION-STUDY OF CLUSTER GROWTH AND MORPHOLOGY ON INERT SUBSTRATES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ELECTRON BINDING-ENERGIES; SUPPORTED METAL-CLUSTERS; RARE-GAS MULTILAYERS; PHOTOELECTRON-SPECTROSCOPY; STICKING PROBABILITY; PALLADIUM CLUSTERS; AMORPHOUS-CARBON; VAPOR-DEPOSITION; VALENCE CHANGES; GOLD CLUSTERS AB Thin metal overlayer growth on solid xenon was characterized by means of synchrotron radiation photoemission spectroscopy. We employed a simple experimental arrangement in which a closed-cycle refrigerator and in situ evaporated metal films were used as substrate for Xe condensation. A "sandwich" geometry, in which the overlayer metal was used as substrate for Xe condensation, simplified the isolation of metal and Xe emission features. The evolution of the Xe and metal photoemission intensity and the line shape of core and valence states, as a function of metal coverage, were used to estimate average particle size and nucleation site density. The coverage dependence of the Sm 4f binding energy, as well as a number of newly identified spectral fingerprints of particle coalescence, support the measured film morphology and particle size. C1 UNIV MISSOURI,DEPT PHYS,KANSAS CITY,MO 64110. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. RP HAUGSTAD, G (reprint author), UNIV MINNESOTA,DEPT CHEM ENGN & MAT SCI,MINNEAPOLIS,MN 55455, USA. NR 45 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD DEC 15 PY 1991 VL 70 IS 12 BP 7333 EP 7341 DI 10.1063/1.349752 PG 9 WC Physics, Applied SC Physics GA GW586 UT WOS:A1991GW58600019 ER PT J AU WISTROM, RE BORGESEN, P SASS, SL NIELSEN, B LEUNG, TC LYNN, KG AF WISTROM, RE BORGESEN, P SASS, SL NIELSEN, B LEUNG, TC LYNN, KG TI ANOMALOUS DEUTERIUM TRAPPING IN EVAPORATED IRON FILMS STUDIED BY POSITRON-ANNIHILATION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ELECTRON-IRRADIATION; THIN-FILMS; ION-BEAM; HYDROGEN; METALS; GOLD AB Forward recoil energy spectroscopy showed that thin, evaporated Fe films trap anomalously large quantities of deuterium. Positron annihilation was used to investigate how the film microstructure influenced this trapping. Polycrystalline films trapped more deuterium and contained more open volume defects than single-crystal films. Annealing reduced both trap and open volume defect concentrations. These results strongly suggest that coalescence voids produced during the thin-film deposition were the sites for the trapping of deuterium. C1 BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. RP CORNELL UNIV, DEPT MAT SCI & ENGN, ITHACA, NY 14853 USA. RI Nielsen, Bent/B-7353-2009 OI Nielsen, Bent/0000-0001-7016-0040 NR 27 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD DEC 15 PY 1991 VL 70 IS 12 BP 7349 EP 7353 DI 10.1063/1.349754 PG 5 WC Physics, Applied SC Physics GA GW586 UT WOS:A1991GW58600021 ER PT J AU TISCHLER, JZ LARSON, BC AF TISCHLER, JZ LARSON, BC TI RESONANT NUCLEAR BRAGG-DIFFRACTION FROM EPITAXIAL (FE2O3)-FE-57 ON NATURAL FE2O3 SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SYNCHROTRON RADIATION; DYNAMICAL DIFFRACTION; MOSSBAUER RADIATION; X-RAYS; TRANSMISSION; SCATTERING; CRYSTAL AB We have used a Co-57 Mossbauer source to measure the resonant nuclear scattering properties of epitaxial (Fe2O3)-Fe-57 grown on natural Fe2O3 substrates. Isotopically enriched (Fe2O3)-Fe-57 layers were grown on <111> oriented Fe2O3 by chemical vapor transport; Mo K-alpha rocking curve measurements showed the mosaic spread of the epitaxial layers to be approximately 15 arcs. The resonant nuclear scattering properties were characterized by absolute integrated intensity measurements of the (electronic and nuclear resonant) 666 reflection and the (pure nuclear resonant) 777 reflection as a function of energy near the resonance. The energy widths of the diffracted intensities were found to be approximately 40 neV (approximately 10-GAMMA) and the integrated intensities were found to lie between the values calculated from kinematic and dynamic diffraction theories. The results indicate that epitaxial crystals such as these can be used for resonant nuclear monochromators to obtain resonant x-ray beams from synchrotron sources. RP TISCHLER, JZ (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 21 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 DEC 15 PY 1991 VL 70 IS 12 BP 7532 EP 7536 DI 10.1063/1.349705 PG 5 WC Physics, Applied SC Physics GA GW586 UT WOS:A1991GW58600046 ER PT J AU KANG, CH SHIN, WC YAMAGATA, Y GOKCEN, S AMES, GF KIM, SH AF KANG, CH SHIN, WC YAMAGATA, Y GOKCEN, S AMES, GF KIM, SH TI CRYSTAL-STRUCTURE OF THE LYSINE-BINDING, ARGININE-BINDING, ORNITHINE-BINDING PROTEIN (LAO) FROM SALMONELLA-TYPHIMURIUM AT 2.7-A RESOLUTION SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID BACTERIAL PERIPLASMIC PERMEASES; HISTIDINE TRANSPORT; ACTIVE-TRANSPORT; X-RAY; COMPONENT; SYSTEMS; COMPLEX; LEUCINE; HISJ AB A wide variety of sugars, amino acids, peptides, and inorganic ions are transported into bacteria by periplasmic transport systems consisting of substrate-specific receptors (binding proteins) and membrane-bound protein complexes. The crystal structure of the lysine-, arginine-, ornithine-binding protein (LAO) at 2.7-angstrom resolution shows that the molecule has a bi-lobal structure and that its topological structure is different from other amino acid-binding proteins but is similar to the sulfate-binding protein and maltose-binding protein. High sequence homology between LAO and the histidine-binding protein (HisJ) and the fact that LAO and HisJ share the same membrane-bound protein complex allow one to define functional regions responsible for the ligand binding and for the interaction with the membrane complex. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,GRAD DIV BIOPHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. RP KIM, SH (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. FU NIAID NIH HHS [AI 30725]; NIDDK NIH HHS [DK 12121] NR 32 TC 77 Z9 79 U1 0 U2 1 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD DEC 15 PY 1991 VL 266 IS 35 BP 23893 EP 23899 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA GV319 UT WOS:A1991GV31900057 PM 1748660 ER PT J AU KLOTS, TD WINTER, BJ PARKS, EK RILEY, SJ AF KLOTS, TD WINTER, BJ PARKS, EK RILEY, SJ TI ICOSAHEDRAL STRUCTURE IN HYDROGENATED COBALT AND NICKEL CLUSTERS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID IRON CLUSTERS; AMMONIA; CHEMISTRY; PRODUCTS; WATER AB Reactions with ammonia and with water are used to probe the geometrical structures of cobalt and nickel clusters that are saturated with hydrogen. Ammonia saturation experiments allow the determination of the number of primary NH3 binding sites on cluster surfaces, and this number shows a repeated minimization to values of 12 for many cluster sizes in the 50- to 200- atom size region. These sizes correspond to closed shells and subshells of icosahedra, suggesting that the ammoniated clusters have metal frameworks with icosahedral structure. The equilibrium reaction of the hydrogenated clusters with a single water molecule shows a pattern of local maxima in the cluster-water binding energy, with the maxima in most cases coming at clusters having one metal atom more than those showing minima in ammonia binding. This correlation suggests that nonammoniated clusters likewise have icosahedral structure, and is consistent with the nature of the metal-water interaction. Some of the larger clusters do not show clear evidence for icosahedral structure at room temperature, although they begin to do so at elevated temperature. Annealing clusters are icosahedral in their most stable configuration at room temperature, although the 147-atom nickel cluster is not. In general, hydrogenation enhances the icosahedral features in the ammonia and water binding patterns compared to those seen for bare clusters, and extends the cluster size region over which icosahedral structure is evident. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RI Winter, Bernd/D-4657-2011 NR 14 TC 67 Z9 67 U1 0 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 DEC 15 PY 1991 VL 95 IS 12 BP 8919 EP 8930 DI 10.1063/1.461224 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GV825 UT WOS:A1991GV82500022 ER PT J AU HEARST, JE HUNT, NG AF HEARST, JE HUNT, NG TI STATISTICAL MECHANICAL THEORY FOR THE PLECTONEMIC DNA SUPERCOIL SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID FLUORESCENCE DEPOLARIZATION; TRANSCRIPTION; NUCLEOSOMES; TWIST; MODEL; RNA; DISPLACEMENT; INITIATION; ENERGETICS; CHROMATIN AB The eigenfunctions for circular boundary conditions of the differential equation first used by Harris and Hearst in 1966 to represent the dynamic properties of the wormlike coil have now been applied to the closed circular coils of high writhe. In order to avoid problems of knotting and excluded volume, the discussion here has been restricted to three-dimensional eigenfunctions with near plectonemic symmetry, i.e., eigenfunctions which cross each constant z plane only twice. It is concluded that at the natural levels of superhelical density that are found for DNA in vivo, the DNA free of protein must be in a highly reduced configurational entropy state. The impact of this conclusion on issues of entanglement, chromosome replication and segregation, and chromosome organization are discussed. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT PHYS,DIV CHEM BIODYNAM,BERKELEY,CA 94720. RP HEARST, JE (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT CHEM,DIV CHEM BIODYNAM,BERKELEY,CA 94720, USA. NR 38 TC 16 Z9 16 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD DEC 15 PY 1991 VL 95 IS 12 BP 9322 EP 9328 DI 10.1063/1.461810 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GV825 UT WOS:A1991GV82500063 ER PT J AU HUNT, NG HEARST, JE AF HUNT, NG HEARST, JE TI ELASTIC MODEL OF DNA SUPERCOILING IN THE INFINITE-LENGTH LIMIT SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID HANDED Z-DNA; CIRCULAR DNA; MONTE-CARLO; SUPERHELICAL DNA; TORSIONAL RIGIDITY; WRITHING NUMBER; EXCLUDED VOLUME; HELICAL REPEAT; RING POLYMERS; DEPENDENCE AB The energies of plectonemic and toroidal supercoiled DNA are calculated by treating DNA as an elastic rod with a finite radius. End effects are ignored and all extensive quantities (e.g., writhe, bend energy) are treated as linear densities (writhe per unit length, bend energy per unit length). Minimum energy configurations are found. For plectonemic DNA, the superhelical pitch angle-alpha is in the range 45-degrees < alpha less-than-or-equal-to 90-degrees. For low values of specific linking difference, most superhelicity is in writhe. As specific linking difference increases, a greater proportion of superhelicity is in twist. Under physiological conditions, roughly 88% of superhelicity is in writhe. Ionic strength effects are discussed, and it is found that variation of excluded volume with ionic strength has a large effect, resulting in significantly greater torsional stress in supercoiled DNA at low ionic strength. For biologically relevant values of specific linking difference, the plectonemic conformation is energetically favored over toroidal conformations. Results are compared with electron microscopy data. The application of the model to DNA conformational transitions is discussed. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT CHEM,DIV CHEM BIODYNAM,BERKELEY,CA 94720. RP HUNT, NG (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT PHYS,DIV CHEM BIODYNAM,BERKELEY,CA 94720, USA. NR 61 TC 43 Z9 43 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD DEC 15 PY 1991 VL 95 IS 12 BP 9329 EP 9336 DI 10.1063/1.461161 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GV825 UT WOS:A1991GV82500064 ER PT J AU MCCOY, JD HONNELL, KG SCHWEIZER, KS CURRO, JG AF MCCOY, JD HONNELL, KG SCHWEIZER, KS CURRO, JG TI CRYSTALLIZATION OF POLYETHYLENE AND POLYTETRAFLUOROETHYLENE BY DENSITY-FUNCTIONAL METHODS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID LATTICE POLYMER SYSTEMS; NONUNIFORM POLYATOMIC SYSTEMS; OPTIMIZED CLUSTER EXPANSIONS; MONTE-CARLO SIMULATIONS; STATISTICAL-MECHANICS; MELTING TRANSITION; POTENTIAL FUNCTION; PHASE-TRANSITIONS; INTERNAL-ROTATION; CLASSICAL FLUIDS AB Molecular density-functional theory is extended to address the crystallization of chemically realistic polymers. The polymer (RISM) reference interaction site model integral-equation approach is employed to calculate the liquid-state structural information required as "input" into our density-functional theory. The single-chain structure is described by the rotational isomeric state model, and the accuracy of both the theoretically calculated single-chain and liquid structures have been verified by direct comparison with Monte Carlo simulation and x-ray scattering, respectively. The driving forces for the crystallization of polymers are found to be completely different from those in monatomic systems and can be understood in terms of an effective "chain-straightening force" (which results from chain packing) combined with a background attractive potential. Remarkably, the predicted melting temperatures for polyethylene and polytetrafluoroethylene at atmospheric pressure are within a few degrees of the experimental values, and the density-temperature phase diagrams are also in good agreement with experiment. Chemically unrealistic, coarse-grained models of polymer structure appear to be inadequate for the crystallization phenomenon, which is found to be quantitatively sensitive to interchain attractive forces and melt compressibility. The aspect ratios in polyethylene and polytetrafluoroethylene melts at the phase transition are predicted to be virtually identical. C1 SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. RI McCoy, John/B-3846-2010 OI McCoy, John/0000-0001-5404-1404 NR 109 TC 55 Z9 55 U1 0 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 DEC 15 PY 1991 VL 95 IS 12 BP 9348 EP 9366 DI 10.1063/1.461163 PG 19 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GV825 UT WOS:A1991GV82500066 ER PT J AU PITZER, KS SINGH, RR AF PITZER, KS SINGH, RR TI RECTILINEAR DIAMETERS AND EXTENDED CORRESPONDING STATES THEORY - REPLY SO JOURNAL OF CHEMICAL PHYSICS LA English DT Letter ID MANY-BODY FORCES; VIRIAL-COEFFICIENTS; FLUIDS; POTENTIALS; EQUATION; ARGON C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. ALLIED SIGNAL INC,BUFFALO RES LAB,BUFFALO,NY 14210. RP PITZER, KS (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 19 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD DEC 15 PY 1991 VL 95 IS 12 BP 9426 EP 9427 DI 10.1063/1.461176 PG 2 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GV825 UT WOS:A1991GV82500079 ER PT J AU MILLER, WH AF MILLER, WH TI SEMICLASSICAL TIME EVOLUTION WITHOUT ROOT SEARCHES - COMMENT SO JOURNAL OF CHEMICAL PHYSICS LA English DT Letter ID CLASSICAL S-MATRIX; COLLISIONS; INTEGRALS C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP MILLER, WH (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 13 TC 141 Z9 141 U1 0 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD DEC 15 PY 1991 VL 95 IS 12 BP 9428 EP 9430 DI 10.1063/1.461177 PG 3 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GV825 UT WOS:A1991GV82500080 ER PT J AU KROUPA, MA FREEDMAN, SJ BARKER, PH FERGUSON, SM AF KROUPA, MA FREEDMAN, SJ BARKER, PH FERGUSON, SM TI A METHOD FOR DETERMINING THE BRANCHING RATIO FOR THE SUPERALLOWED DECAY - C-10(0+,GS)-]B-10(0+, 1.74 MEV) + E+ + V SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID KOBAYASHI-MASKAWA MATRIX; FERMI DECAYS; BETA-DECAYS; NUCLEI AB We describe a new way of determining the strength of the superallowed branch of the beta-decay of C-10, C-10(0+, gs) --> B-10(0+, 1.74 MeV) + e+ + nu. Precise knowledge of the branching ratio is needed to compute the experimental ft-value and the weak vector coupling constant. C1 UNIV CHICAGO,CHICAGO,IL 60637. UNIV AUCKLAND,AUCKLAND,NEW ZEALAND. WESTERN MICHIGAN UNIV,KALAMAZOO,MI 49008. RP KROUPA, MA (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 20 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD DEC 15 PY 1991 VL 310 IS 3 BP 649 EP 656 DI 10.1016/0168-9002(91)91112-9 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GV086 UT WOS:A1991GV08600010 ER PT J AU BONANG, CC CAMERON, SM AF BONANG, CC CAMERON, SM TI INTRACAVITY RESONANCE HYPER-RAMAN SCATTERING WITH A SYNCHRONOUSLY PUMPED MODE-LOCKED DYE-LASER SO OPTICS COMMUNICATIONS LA English DT Article ID BENZENE; INTENSITIES; EXCITATION AB The first resonance hyper-Raman spectra of liquids are made possible using an intracavity scattering geometry in a synchronously pumped picosecond stilbene 420 dye laser. Comparisons are made with the corresponding UV resonance Raman spectra, which are generated by the second harmonic of the cavity dumped output. Information about both the vibrational and electronic states of sample molecules is obtained. RP BONANG, CC (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT APPL SCI,LIVERMORE,CA 94550, USA. NR 18 TC 10 Z9 10 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD DEC 15 PY 1991 VL 86 IS 6 BP 504 EP 508 DI 10.1016/0030-4018(91)90153-5 PG 5 WC Optics SC Optics GA GY124 UT WOS:A1991GY12400013 ER PT J AU TAN, ZQ HEALD, SM CHEONG, SW HWANG, HY COOPER, AS BUDNICK, JI AF TAN, ZQ HEALD, SM CHEONG, SW HWANG, HY COOPER, AS BUDNICK, JI TI CATION ORDERING AND OXYGEN STOICHIOMETRY IN LARSRCU2O6+DELTA (R = LA, PR, ND, SM AND GD) SO PHYSICA C LA English DT Article ID SUPERCONDUCTIVITY; OXIDES; EXCESS; SITE AB We have synthesized single phase La2SrCu2O6+delta and LaRSrCu2O6+delta with R = Pr, Nd, Sm and Gd and studied a number of their physical properties. We report lanthanide and strontium site selectivity as inferred from XANES (X-ray absorption near-edge structure) and EXAFS (extended X-ray absorption fine structure) data. We also discuss the relationship between cation site selectivity and the oxygen stoichiometry. The oxygen content varies from 6.2 for R = La and Pr to slightly less than 6.0 for R = Sm and Gd. From Pr to Gd the rare earth ions increasingly prefer to occupy the M (1) site (sandwiched between the double CuO2 planes) and increasingly more Sr and La occupy the M (2) site. Our XANES and EXAFS data suggest that the oxygen in excess of 6.0 is located between the double CuO2 planes and near the Sr and La ions at the M (1) site. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. UNIV CONNECTICUT,INST MAT SCI,STORRS,CT 06269. UNIV CONNECTICUT,DEPT PHYS,STORRS,CT 06269. RP TAN, ZQ (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Hwang, Harold/I-6943-2012 NR 17 TC 5 Z9 5 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 DEC 15 PY 1991 VL 184 IS 4-6 BP 229 EP 234 DI 10.1016/0921-4534(91)90387-E PG 6 WC Physics, Applied SC Physics GA GX033 UT WOS:A1991GX03300003 ER PT J AU VEAL, BW PAULIKAS, AP AF VEAL, BW PAULIKAS, AP TI DEPENDENCE OF HOLE CONCENTRATION ON OXYGEN VACANCY ORDER IN YBA2CU3O7-DELTA - A CHEMICAL VALENCE MODEL SO PHYSICA C LA English DT Article ID NORMAL-STATE RESISTIVITY; A-B ANISOTROPY; SUPERCONDUCTING YBA2CU3O7-DELTA; DEFICIENT YBA2CU3O7-DELTA; UNTWINNED YBA2CU3O7-DELTA; SINGLE-CRYSTAL; PHASE-DIAGRAM; TWIN-FREE; TC; TEMPERATURE AB Using a simple chemical model, the hole concentration is calculated for YBa2Cu3O7-delta as a function of oxygen stoichiometry-delta. For the calculations, it is assumed that 2-coordinated Cu is monovalent while 3- and 4-coordinated Cu's are nominally divalent. Because monovalent Cu's bind more electrons than do divalent Cu's, the degree of hole doping of the conduction band depends on the oxygen vacancy configuration. We examine extreme ordering conditions and apply the chemical valence model to an extended phase field of the double-cell (Ortho II) structure. For delta > 0.2, the dependence of the calculated hole concentration on delta, obtained for the (defect) double-cell structure, is similar to the observed dependence of T(c) on delta suggesting a simple relationship between T(c) and hole concentration. If T(c) is assumed to depend quadratically on hole concentration (as observed for other oxide superconductors), then the calculated T(c) versus delta corresponds closely with experiment. Low temperature aging behavior is also simulated in the model. RP VEAL, BW (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 45 TC 95 Z9 95 U1 1 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 15 PY 1991 VL 184 IS 4-6 BP 321 EP 331 DI 10.1016/0921-4534(91)90398-I PG 11 WC Physics, Applied SC Physics GA GX033 UT WOS:A1991GX03300014 ER PT J AU ECKE, RE MAINIERI, R SULLIVAN, TS AF ECKE, RE MAINIERI, R SULLIVAN, TS TI UNIVERSALITY IN QUASI-PERIODIC RAYLEIGH-BENARD CONVECTION SO PHYSICAL REVIEW A LA English DT Article ID DISSIPATIVE SYSTEMS; STRANGE ATTRACTORS; QUASI-PERIODICITY; MODE-LOCKING; HE-3-SUPERFLUID-HE-4 MIXTURES; JOSEPHSON-JUNCTIONS; DYNAMICAL-SYSTEMS; FREQUENCY LOCKING; HOPF-BIFURCATION; FRACTAL MEASURES AB We study universal scaling properties of quasiperiodic Rayleigh-Benard convection in a He-3-superfluid-He-4 mixture. The critical line is located in a parameter space of Rayleigh and Prandtl numbers using a transient-Poincare-section technique to identify transitions from nodal periodic points to spiral periodic points within resonance horns. We measure the radial and angular contraction rates and extract the linear-stability eigenvalues (Flouquet multipliers) of the periodic point. At the crossings of the critical line with the lines of fixed golden-mean-tail winding number we determine the universality class of our experimental dynamics using f(alpha) and trajectory-scaling-function analyses. A technique is used to obtain a robust five-scale approximation to the universal trajectory scaling function. Different methods of multifractal analysis are employed and an understanding of statistical and systematic errors in these procedures is developed. The power law of the inflection point of the map, determined for three golden-mean-tail winding numbers, is 2.9 +/- 0.3, corresponding to the universality class of the sine-circle map. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP ECKE, RE (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. OI Ecke, Robert/0000-0001-7772-5876 NR 52 TC 14 Z9 14 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC 15 PY 1991 VL 44 IS 12 BP 8103 EP 8118 DI 10.1103/PhysRevA.44.8103 PG 16 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GW604 UT WOS:A1991GW60400036 ER PT J AU HAN, SJ AF HAN, SJ TI STABILITY OF AN IMPLODING SPHERICAL-SHELL SO PHYSICAL REVIEW A LA English DT Article ID RAYLEIGH-TAYLOR INSTABILITY; HYDRODYNAMIC INSTABILITIES; PLASMA SHELL; DRIVEN; AMPLIFICATION; TURBULENCE; TOMOGRAPHY; TOKAMAK AB It is shown that, in an imploding spherical shell, the surface instabilities are of two different types. The first, which occurs at the outer surface, is the well-known Rayleigh-Taylor instability. The second instability occurs at the inner surface. The characteristics of this instability are similar to those of amplified sound waves in an imploding plasma shell. It is suggested that this instability is driven by the amplified sound waves. RP HAN, SJ (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 35 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC 15 PY 1991 VL 44 IS 12 BP 8119 EP 8127 DI 10.1103/PhysRevA.44.8119 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GW604 UT WOS:A1991GW60400037 ER PT J AU ITOH, K NISHIKAWA, M HOLROYD, RA AF ITOH, K NISHIKAWA, M HOLROYD, RA TI ELECTRON-SCATTERING IN INSULATING LIQUID-MIXTURES SO PHYSICAL REVIEW B LA English DT Article ID QUASI-FREE-ELECTRON; VAPOR COEXISTENCE LINE; HALL-MOBILITY; EXCESS ELECTRONS; THERMODYNAMIC PROPERTIES; INJECTED ELECTRONS; CRITICAL-POINT; PVT SURFACE; ENERGY V0; NEOPENTANE AB A drift-mobility formula for quasifree electrons in nonpolar liquid mixture is derived. The theory is based on electron scattering by potential fluctuations due to concentration fluctuations in the mixture as well as density fluctuations. A comparison is made with the observed mobilities. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RP ITOH, K (reprint author), UNIV TOKYO,DEPT PURE & APPL SCI,3-8-1 KOMABA,MEGURO KU,TOKYO 153,JAPAN. NR 34 TC 5 Z9 5 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 15 PY 1991 VL 44 IS 23 BP 12680 EP 12685 DI 10.1103/PhysRevB.44.12680 PG 6 WC Physics, Condensed Matter SC Physics GA GV741 UT WOS:A1991GV74100002 ER PT J AU HEYMAN, JN HALLER, EE GIESEKUS, A AF HEYMAN, JN HALLER, EE GIESEKUS, A TI CHARACTERIZATION OF THE BERYLLIUM SUBSTITUTIONAL PAIR IN SILICON BY INFRARED-SPECTROSCOPY SO PHYSICAL REVIEW B LA English DT Article ID DOUBLE ACCEPTORS; EXCITED-STATES; NEUTRAL ZINC; GERMANIUM; PIEZOSPECTROSCOPY; PHOTOLUMINESCENCE; PHOTOCONDUCTIVITY; SEMICONDUCTORS; ABSORPTION; COMPLEXES AB We have performed a detailed, high-resolution infrared study of a beryllium-related center in silicon with ionization energy E(upsilon) +145.8 meV. Very-high-signal-to-noise-ratio transmission spectra have been obtained that show qualitatively different features. The excitation spectrum of this center, which we designate as Be2, consists of an acceptor-effective-mass line series accompanied by a second weaker series displaced to higher energy by 2 meV. We present absorption spectra obtained under uniaxial stress. The stress data show that the center possesses trigonal point symmetry, and indicate that the two series arise from one defect. We develop a simple model of a neutral, trigonal double acceptor in which the hole-hole correlation effects are included in the description of the ground state, but are neglected in the treatment of the effective-mass-like excited states. This model explains our experimental results. We suggest that the center is a beryllium pair in which Be atoms occupy nearest-neighbor Si sites. Recent calculations indicate that the substitutional pair should be metastable under certain conditions, and that the lowest-energy configuration of this center should be a double acceptor. C1 UNIV DORTMUND,INST PHYS,W-4600 DORTMUND,GERMANY. RP HEYMAN, JN (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 27 TC 3 Z9 3 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 15 PY 1991 VL 44 IS 23 BP 12769 EP 12775 DI 10.1103/PhysRevB.44.12769 PG 7 WC Physics, Condensed Matter SC Physics GA GV741 UT WOS:A1991GV74100013 ER PT J AU SIMMONS, JA HWANG, SW TSUI, DC WEI, HP ENGEL, LW SHAYEGAN, M AF SIMMONS, JA HWANG, SW TSUI, DC WEI, HP ENGEL, LW SHAYEGAN, M TI RESISTANCE FLUCTUATIONS IN THE INTEGRAL-QUANTUM-HALL-EFFECT AND FRACTIONAL-QUANTUM-HALL-EFFECT REGIMES SO PHYSICAL REVIEW B LA English DT Article ID DIMENSIONAL ELECTRON-GAS; EDGE CURRENTS; 2 DIMENSIONS; CHARGE; EXCITATIONS; CONDUCTANCE; TRANSPORT; STATES; MAGNETOTRANSPORT; HETEROSTRUCTURES AB We report on our measurements of resistance fluctuations as a function of magnetic field B in an AlxGa1-xAs/GaAs heterostructure of etched width w = 2.5-mu-m in the integral- and fractional-quantum-Hall-effect regimes. High-frequency fluctuations are observed near the longitudinal resistance (R(xx)) minima for v = 1, 2, 3, 4, and 1/3. The quasiperiods DELTA-B (v = integer) of the fluctuations for integer v are all approximately 0.016 T, while for v = 1/3 the quasiperiod DELTA-B (v = 1/3) is approximately 0.05 T, or a factor of 3 larger. The fluctuations at integer v are consistent with inter-edge-state tunneling via magnetically bound states encircling a potential hill of a diameter roughly equal to the conducting width of the channel. A similar model, with the difference that the tunneling is by quasiparticles of fractional charge e* = e/q, predicts a scaling of the quasiperiod as DELTA-B (v = 1/q) = q-DELTA-B (v = integer). Interpreted in terms of this model, the data provide direct evidence of the existence of quasiparticles of charge e* = e/3 in the v = 1/3 fractional quantum Hall effect. For both v = 1/3 and v = integer, the individual fluctuation patterns for different pairs of voltage probes are strongly correlated only if the pairs share a length of the channel, indicating that the source of the fluctuations is local, as predicted by the model. A Coulomb blockade as the origin of the fluctuations is ruled out by the fact that for v = 1 and 2 the fluctuation amplitudes saturate at temperatures T(c)(v = 1) congruent-to 66 mK and T(c)(v = 2)congruent-to 121 mK, and also saturate at currents I(c)(v = 1) congruent-to 0.5 nA and I(c) (v = 2) congruent-to 1.7-3.0 nA. These results indicate that for integer v, the bound-state-energy spacing DELTA-epsilon(v) scales as v or B-1, inconsistent with a Coulomb blockade. C1 PRINCETON UNIV,PRINCETON,NJ 08544. RP SIMMONS, JA (reprint author), SANDIA NATL LABS,DIV 1152,ALBUQUERQUE,NM 87185, USA. NR 43 TC 60 Z9 60 U1 1 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 DEC 15 PY 1991 VL 44 IS 23 BP 12933 EP 12944 DI 10.1103/PhysRevB.44.12933 PG 12 WC Physics, Condensed Matter SC Physics GA GV741 UT WOS:A1991GV74100036 ER PT J AU TAYLOR, PA AF TAYLOR, PA TI WAVE MOTION RESULTING FROM ADHESIVE AVALANCHE BETWEEN METALLIC SURFACES SO PHYSICAL REVIEW B LA English DT Article AB Atomistic simulations of impacting copper surfaces were performed using a many-body potential defined by the embedded-atom method. In the course of impact, as the impact surfaces approach each other, an adhesive avalanche occurs. That is, at a separation of roughly 2 angstrom beyond the bulk interplanar spacing, one or both surface layers becomes unstable and abruptly moves towards the other. The adhesive avalanche signals a transition from an initial system with two distinct surfaces (at the impact interface) to one possessing no identifiable surfaces. This motion generates a brief (< 1 psec) but strong (10 GPa) tensile wave ahead of a compressive shock wave, which propagate away from the interface into the bulk. The tensile wave appears at impact velocities as low as 10 m/sec. Similar dynamic effects appear in a broad range of materials, and indeed may be of fundamental importance in phenomena underlying adhesion, friction, and wear. RP TAYLOR, PA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 10 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 15 PY 1991 VL 44 IS 23 BP 13026 EP 13030 DI 10.1103/PhysRevB.44.13026 PG 5 WC Physics, Condensed Matter SC Physics GA GV741 UT WOS:A1991GV74100047 ER PT J AU KONG, Y LYNN, KG AF KONG, Y LYNN, KG TI MULTIPLE ENCOUNTERS OF THERMAL POSITRONS WITH SURFACES SO PHYSICAL REVIEW B LA English DT Note ID ELECTRON AB We propose that the thermal-positron reflection by surface potentials, including the potential-well effects, is more substantial than predicted by a simple step-potential model. Thus, positrons may encounter the surface potential many times to participate in surface-escape processes. The physical picture presented here is not only more realistic than the step-potential model, it also suggests possible explanations of the related experimental findings. RP KONG, Y (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 13 TC 4 Z9 4 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 15 PY 1991 VL 44 IS 23 BP 13109 EP 13111 DI 10.1103/PhysRevB.44.13109 PG 3 WC Physics, Condensed Matter SC Physics GA GV741 UT WOS:A1991GV74100063 ER PT J AU BATISTIC, I GAMMEL, JT BISHOP, AR AF BATISTIC, I GAMMEL, JT BISHOP, AR TI INCOMMENSURATE GROUND-STATES OF A COMMENSURATE PEIERLS-HUBBARD HAMILTONIAN SO PHYSICAL REVIEW B LA English DT Article ID LINEAR-CHAIN COMPLEXES; 2 BAND MODEL; TETRATHIAFULVALENE-TETRACYANOQUINODIMETHANE; LATTICE STRUCTURE; TRANSITION; SUPERCONDUCTORS AB The possibility of long-period ("superlattice") ground states is systematically investigated in a commensurate (3/4-filled), one-dimensional two-band Peierls-Hubbard Hamiltonian. This model has been proposed to describe halogen-bridged mixed-valence linear-chain compounds and is a one-dimensional analog of a Hamiltonian proposed to model cuprate and bismuthate oxide superconductors. Conventional superlattice phases are driven by competing length scales (for example, from incommensurate filling or an external incommensurate potential). However, these long-period ground states are intrinsic to a competition between long-range repulsive Coulomb forces and the attractive on-site electron-phonon interaction, even at exactly 3/4 filling where a period of four lattice constants might be naively expected by Peierls's argument. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP BATISTIC, I (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT SCI,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 33 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 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD DEC 15 PY 1991 VL 44 IS 24 BP 13228 EP 13236 DI 10.1103/PhysRevB.44.13228 PG 9 WC Physics, Condensed Matter SC Physics GA GX682 UT WOS:A1991GX68200003 ER PT J AU OBRIEN, WL JIA, J DONG, QY CALLCOTT, TA MUELLER, DL EDERER, DL SHINN, ND WORONICK, SC AF OBRIEN, WL JIA, J DONG, QY CALLCOTT, TA MUELLER, DL EDERER, DL SHINN, ND WORONICK, SC TI DECAY CHANNELS OF AL L2,3 EXCITONS AND THE ABSENCE OF O-K-EXCITONS IN ALPHA-AL2O3 SO PHYSICAL REVIEW B LA English DT Article ID ALKALI-HALIDES; CORE EXCITONS; ABSORPTION AB The Al L2,3 and O K thresholds for single-crystal alpha-Al2O3 have been studied by photoemission. Energy-distribution curves, constant-initial-state (CIS), and constant-final-state (CFS) spectra are reported and compared to the absorption spectrum reported previously. An exciton appears as a doublet at threshold in the Al L2,3 CFS, CIS, and absorption spectra. The details of the Al L2,3 CFS spectrum and absorption spectrum are similar, while the exciton is the only feature present in the CIS spectrum. Comparisons of the various Al L2,3 spectra allow the probabilities of different exciton decay channels to be determined. The probability for nonradiative direct recombination of the exciton is found to be (8 +/- 1)% and the probability for Auger decay of the exciton is found to be (72 +/- 20)%. Comparisons of the O K CIS and CFS spectra suggest that no O K exciton is formed. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. SANDIA NATL LABS,DIV 1114,ALBUQUERQUE,NM 87185. CORNELL UNIV,ITHACA,NY 14850. RP OBRIEN, WL (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. NR 15 TC 11 Z9 11 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD DEC 15 PY 1991 VL 44 IS 24 BP 13277 EP 13282 DI 10.1103/PhysRevB.44.13277 PG 6 WC Physics, Condensed Matter SC Physics GA GX682 UT WOS:A1991GX68200009 ER PT J AU MONNIER, R STEINER, MM SHAM, LJ AF MONNIER, R STEINER, MM SHAM, LJ TI ABSENCE OF SPIN POLARIZATION IN THE THERMOCURRENT EMITTED BY A CESIATED FERROMAGNETIC IRON SURFACE SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONS AB A simple explanation is proposed for the recently observed absence of spin polarization of the thermocurrent emitted by cesiated ferromagnetic surfaces of Fe and Ni. First, the spin-dependent flux across the surface is computed, starting from a self-consistent spin-polarized band-structure calculation. This yields the correct result for Ni, but a large (-34%) negative polarization for Fe. It is then argued that most minority-spin electrons arise from narrow d bands and will not contribute to the current due to localization effects and wave function and velocity mismatch at the surface. A quantitative estimate is given in terms of a lower cutoff in the band-velocity distribution. C1 UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV CALIF LOS ALAMOS SCI LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP MONNIER, R (reprint author), SWISS FED INST TECHNOL,FESTKORPERPHYS LAB,CH-8093 ZURICH,SWITZERLAND. OI Sham, Lu/0000-0001-5718-2077 NR 10 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 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD DEC 15 PY 1991 VL 44 IS 24 BP 13678 EP 13680 DI 10.1103/PhysRevB.44.13678 PG 3 WC Physics, Condensed Matter SC Physics GA GX682 UT WOS:A1991GX68200056 ER PT J AU WANG, LQ HUSSAIN, Z HUANG, ZQ VONWITTENAU, AES LINDLE, DW SHIRLEY, DA AF WANG, LQ HUSSAIN, Z HUANG, ZQ VONWITTENAU, AES LINDLE, DW SHIRLEY, DA TI SURFACE-STRUCTURE OF SQUARE ROOT 3 X SQUARE ROOT 3R 30-DEGREES-CL/NI(111) DETERMINED USING LOW-TEMPERATURE ANGLE-RESOLVED PHOTOEMISSION EXTENDED FINE-STRUCTURE SO PHYSICAL REVIEW B LA English DT Article ID ENERGY ELECTRON-DIFFRACTION; WAVE ABSORPTION PROFILES; PHOTOELECTRON DIFFRACTION; STRUCTURE SPECTROSCOPY; RELAXATION; GEOMETRY; SULFUR; NICKEL; SCATTERING; CU(001) AB A surface structural study of the square-root 3 x square-root 3 R 30-degrees Cl/Ni(111) adsorbate system was made using low-temperature angle-resolved photoemission extended fine structure. The experiments were performed along two emission directions, [111] and [110], and at two temperatures, 120 and 300 K. The multiple-scattering spherical-wave analysis determined that the Cl atom adsorbs in the fcc threefold hollow site, 1.837(8) angstrom above the first nickel layer, with a Cl-Ni bond length of 2.332(6) angstrom, and an approximate 5% contraction between the first and the second nickel layers (the errors in parentheses are statistical standard deviations only). C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT & CHEM SCI,BERKELEY,CA 94720. RP WANG, LQ (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 26 TC 24 Z9 24 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD DEC 15 PY 1991 VL 44 IS 24 BP 13711 EP 13719 DI 10.1103/PhysRevB.44.13711 PG 9 WC Physics, Condensed Matter SC Physics GA GX682 UT WOS:A1991GX68200060 ER PT J AU YANG, LQ RAHMAN, TS DAW, MS AF YANG, LQ RAHMAN, TS DAW, MS TI SURFACE VIBRATIONS OF AG(100) AND CU(100) - A MOLECULAR-DYNAMICS STUDY SO PHYSICAL REVIEW B LA English DT Article ID EMBEDDED-ATOM-METHOD; INELASTIC ELECTRON-SCATTERING; RAYLEIGH PHONON-DISPERSION; THERMAL-EXPANSION; TEMPERATURE-DEPENDENCE; METAL-SURFACES; RELAXATION; DIRECTION; NI(100); CU(111) AB We present molecular-dynamics studies of Ag(100) and Cu(100), using interatomic potentials obtained by the embedded-atom method. The low-temperature results for the surface phonon frequencies and polarizations at selected points in the two-dimensional Brillouin zone are in good agreement with experimental data and also with results of first-principles calculations on both systems. The mean-square vibrational amplitudes of the surface atoms are found to be isotropic and much larger than the reported values for the bulk. As a function of increasing temperature, the frequencies of the surface phonons are found to redshift and the peaks to broaden. The variation of the mean-square vibrational amplitude with temperature displays effects of enhanced surface anharmonicity. C1 SANDIA NATL LABS, DIV THEORET, LIVERMORE, CA 94551 USA. RP KANSAS STATE UNIV AGR & APPL SCI, DEPT PHYS, CARDWELL HALL, MANHATTAN, KS 66506 USA. NR 45 TC 74 Z9 74 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 DEC 15 PY 1991 VL 44 IS 24 BP 13725 EP 13733 DI 10.1103/PhysRevB.44.13725 PG 9 WC Physics, Condensed Matter SC Physics GA GX682 UT WOS:A1991GX68200062 ER PT J AU SCHMITZ, PJ LEUNG, WY KANG, HC THIEL, PA AF SCHMITZ, PJ LEUNG, WY KANG, HC THIEL, PA TI IDENTIFICATION OF RECONSTRUCTION IN PT FILMS DEPOSITED ON PD(110) AT ROOM-TEMPERATURE SO PHYSICAL REVIEW B LA English DT Article ID ENERGY ELECTRON-DIFFRACTION; PT(110)-(1X2) SURFACE; THIN-FILM; LEED; 1X2; SPECTROSCOPY; TRANSITION; STABILITY; PLANE AB We have studied the properties of Pt films on Pd(110), grown by deposition at 300 K and annealed up to 900 K, using low-energy electron diffraction and Auger-electron spectroscopy. We observe (1 x 2) and (1 x 3) superstructures, depending upon Pt coverage and annealing temperature. At one monolayer, the (1 x 1) periodicity is unperturbed. Between one and three monolayers, a broad and streaky (1 x 2) develops upon annealing, then fades to (1 x 1) as the film dissolves. At three monolayers and above, the broad and streaky (1 x 2) splits to a (1 x 3), then fades again to (1 x 1) at high temperature. Adsorption of CO causes (1 x 3) --> (1 x 1) reversion at relatively low temperature, 430 K. Based upon the known behavior of Pt(110) reconstructions, this is strong evidence that the (1 x 3) structure of the Pt film is a surface reconstruction. C1 IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. RI Kang, Hway Chuan/A-3401-2012 NR 35 TC 5 Z9 5 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD DEC 15 PY 1991 VL 44 IS 24 BP 13734 EP 13739 DI 10.1103/PhysRevB.44.13734 PG 6 WC Physics, Condensed Matter SC Physics GA GX682 UT WOS:A1991GX68200063 ER PT J AU FARTASH, A FULLERTON, EE SCHULLER, IK BOBBIN, SE WAGNER, JW CAMMARATA, RC KUMAR, S GRIMSDITCH, M AF FARTASH, A FULLERTON, EE SCHULLER, IK BOBBIN, SE WAGNER, JW CAMMARATA, RC KUMAR, S GRIMSDITCH, M TI EVIDENCE FOR THE SUPERMODULUS EFFECT AND ENHANCED HARDNESS IN METALLIC SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Note ID EFFECTIVE ELASTIC-CONSTANTS; SURFACE ACOUSTIC-WAVES; THIN-FILMS; SUPER-LATTICES; ANOMALIES; NICKEL; MODULI; STRAIN; PALLADIUM; FOILS AB A study of the mechanical properties of Cu/Nb superlattices shows that for modulation wavelengths below approximately 50 angstrom the biaxial modulus increases by approximately 15%, the shear modulus decreases by approximately 30%, and the flexural modulus does not change. These observations show that anomalies with different signs for elastic moduli can coexist in the same material. Measurements performed on both supported and unsupported films show that the anomalous effects are not induced by the presence of a substrate. The superlattices are also found to have a hardness larger than either Cu or Nb. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. RP FARTASH, A (reprint author), UNIV CALIF SAN DIEGO,DEPT PHYS 0319,LA JOLLA,CA 92093, USA. RI Cammarata, Robert /A-3307-2010; Fullerton, Eric/H-8445-2013 OI Fullerton, Eric/0000-0002-4725-9509 NR 43 TC 53 Z9 53 U1 2 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD DEC 15 PY 1991 VL 44 IS 24 BP 13760 EP 13763 DI 10.1103/PhysRevB.44.13760 PG 4 WC Physics, Condensed Matter SC Physics GA GX682 UT WOS:A1991GX68200067 ER PT J AU BEDROSSIAN, P KLITSNER, T AF BEDROSSIAN, P KLITSNER, T TI SURFACE RECONSTRUCTION IN LAYER-BY-LAYER SPUTTERING OF SI(111) SO PHYSICAL REVIEW B LA English DT Note ID ENERGY ELECTRON-DIFFRACTION; EPITAXIAL-GROWTH; ION-BOMBARDMENT; GE 001; OSCILLATIONS; DAMAGE; SI AB Using scanning tunneling microscopy, we have investigated vacancy-mediated, layer-by-layer removal of surface atoms from Si(111) under 225-eV Xe-ion bombardment. We observe, with increasing substrate temperature, both the transition from vacancy-cluster nucleation to step retraction, and a transition from disruption to preservation of the 7 x 7 reconstruction on exposed material. We discuss the consequences of these observations for ion-beam-mediated epitaxy. RP BEDROSSIAN, P (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 19 TC 66 Z9 66 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD DEC 15 PY 1991 VL 44 IS 24 BP 13783 EP 13786 DI 10.1103/PhysRevB.44.13783 PG 4 WC Physics, Condensed Matter SC Physics GA GX682 UT WOS:A1991GX68200073 ER PT J AU TURNER, MS AF TURNER, MS TI TILTED UNIVERSE AND OTHER REMNANTS OF THE PREINFLATIONARY UNIVERSE SO PHYSICAL REVIEW D LA English DT Article ID COSMIC BACKGROUND-RADIATION; LARGE-SCALE ANISOTROPY; ELLIPTICAL GALAXIES; INFLATIONARY UNIVERSE; SUPERGALACTIC CENTER; INVISIBLE AXION; SPECTROSCOPY; PHOTOMETRY; FLUCTUATIONS; COSMOLOGY AB If the inflationary epoch lasted only approximately 10 e-foldings longer than required to solve the horizon problem, observable "remnants" of the preinflationary Universe may exist. They include dipole and quadrupole anisotropies of the cosmic microwave background radiation (CMBR). These "remnants" arise due to preinflationary fluctuations in scalar fields such as the inflaton, the axion, and the ilion, or due to preinflationary density perturbations. The dipole anisotropy can lead to the illusion of a "tilted universe": Viewed from the rest frame of the CMBR galaxies throughout the entire observable Universe would have a uniform streaming velocity. A dipole CMBR anisotropy could provide a very unconventional explanation for the large peculiar velocities measured for galaxies in our approximately 50h-1 Mpc neighborhood. Among things very unlikely to be a "remnant" of inflation is a value of OMEGA today that is significantly different from unity. C1 UNIV CHICAGO,ENRICO FERMI INST,DEPT PHYS & ASTRON,CHICAGO,IL 60637. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTROPHYS,CHICAGO,IL 60637. RP TURNER, MS (reprint author), NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 32 TC 80 Z9 79 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 DEC 15 PY 1991 VL 44 IS 12 BP 3737 EP 3748 DI 10.1103/PhysRevD.44.3737 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GX138 UT WOS:A1991GX13800004 ER PT J AU RAGHAVAN, RS BALANTEKIN, AB LORETI, F BALTZ, AJ PAKVASA, S PANTALEONE, J AF RAGHAVAN, RS BALANTEKIN, AB LORETI, F BALTZ, AJ PAKVASA, S PANTALEONE, J TI DIRECT TESTS FOR SOLAR-NEUTRINO MASS, MIXING, AND MAJORANA MAGNETIC-MOMENT SO PHYSICAL REVIEW D LA English DT Article ID SPIN-FLAVOR PRECESSION; RESONANT AMPLIFICATION; OSCILLATIONS; MATTER; EARTH; REGENERATION AB The present data on solar neutrinos may suggest matter effects resulting in (i) flavor conversion (Mikheyev-Smirnov-Wolfenstein effect) due to a nonzero neutrino mass and/or mixing and (ii) spin-flavor conversion due to a Majorana magnetic moment. Both possibilities can be explicitly tested in upcoming experiments (i) via the effect of Earth matter on Be-7 neutrinos and (ii) by the detection of B-8 antineutrinos during solar activity. C1 UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. UNIV HAWAII MANOA,DEPT PHYS,HONOLULU,HI 96822. UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521. RP RAGHAVAN, RS (reprint author), AT&T BELL LABS,MURRAY HILL,NJ 07974, USA. RI Balantekin, Akif Baha/E-4776-2010 OI Balantekin, Akif Baha/0000-0002-2999-0111 NR 31 TC 37 Z9 37 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 DEC 15 PY 1991 VL 44 IS 12 BP 3786 EP 3790 DI 10.1103/PhysRevD.44.3786 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GX138 UT WOS:A1991GX13800009 ER PT J AU KASTOR, D TRASCHEN, J AF KASTOR, D TRASCHEN, J TI DIQUARK STARS SO PHYSICAL REVIEW D LA English DT Article ID NEUTRON STAR; QUARK AB We study neutron stars with cores consisting of a mixture of constituent-mass quarks and diquarks. Diquarks are colored, two-quark bound states which have been conjectured to exist in the density range above deconfinement. We compute an approximate equation of state for such a mixture. At relatively low densities this has the form of a polytrope with adiabatic index GAMMA = 2. We find that the maximum-mass star with a quark-diquark core surrounded by a low-density envelope of nucleons has mass 1.79M., radius 11.4 km, and central density 1.8 x 10(15) g/cm3. C1 UNIV MASSACHUSETTS,DEPT PHYS,AMHERST,MA 01003. RP KASTOR, D (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 12 TC 27 Z9 27 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 15 PY 1991 VL 44 IS 12 BP 3791 EP 3796 DI 10.1103/PhysRevD.44.3791 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GX138 UT WOS:A1991GX13800010 ER PT J AU BURKARDT, M LANGNAU, A AF BURKARDT, M LANGNAU, A TI ROTATIONAL INVARIANCE IN LIGHT-CONE QUANTIZATION SO PHYSICAL REVIEW D LA English DT Article ID INFINITE-MOMENTUM FRAME; QUANTUM FIELD-THEORIES; DIRAC FIELDS; FINITENESS; MODEL AB In the study of the decay of a heavy scalar particle at rest in the Yukawa model at the one- and two-loop levels, it is shown explicitly that naive light-cone quantization leads to a violation of rotational invariance. Noncovariant counterterms are constructed in detail to restore Lorentz covariance. An analysis of surface and zero-mode contributions clarifies the origin of the problem. RP BURKARDT, M (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 28 TC 53 Z9 54 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 DEC 15 PY 1991 VL 44 IS 12 BP 3857 EP 3867 DI 10.1103/PhysRevD.44.3857 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GX138 UT WOS:A1991GX13800017 ER PT J AU BORNYAKOV, VG CREUTZ, M MITRJUSHKIN, VK AF BORNYAKOV, VG CREUTZ, M MITRJUSHKIN, VK TI MODIFIED WILSON ACTION AND Z2 ARTIFACTS IN SU(2) LATTICE GAUGE-THEORY SO PHYSICAL REVIEW D LA English DT Article ID TOPOLOGICAL SUSCEPTIBILITY; CONFINEMENT; QUARKS; FIELDS AB A modified Wilson action with an additional chemical potential for the number of "negative plaquettes" is used to study the role of Z2 artifacts in SU(2) lattice gauge theory and their possible influence on large-scale physics. The phase diagram of the model with modified action is studied. We show that large-scale objects, e.g., Wilson loops and their ratios, can be strongly influenced by lattice artifacts. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV BIELEFELD,W-4800 BIELEFELD,GERMANY. DUBNA JOINT NUCL RES INST,DUBNA,USSR. RP BORNYAKOV, VG (reprint author), PROTVINO HIGH ENERGY PHYS INST,PROTNINO,USSR. NR 20 TC 12 Z9 12 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 15 PY 1991 VL 44 IS 12 BP 3918 EP 3923 DI 10.1103/PhysRevD.44.3918 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GX138 UT WOS:A1991GX13800025 ER PT J AU BODWIN, GT KOVACS, EV SLOAN, J AF BODWIN, GT KOVACS, EV SLOAN, J TI RENORMALIZATION COUNTERTERMS IN LINEARIZED LATTICE QED SO PHYSICAL REVIEW D LA English DT Article ID CHIRAL GAUGE-THEORIES; SCHWINGER MODEL; FERMIONS AB We analyze in weak-coupling perturbation theory the renormalization-counterterm structure of linearized lattice quantum electrodynamics (QED). We find that, although the linearized theory is gauge invariant, counterterms appear that would be forbidden by the Ward identities in the compact formulation of lattice QED. For example, the photon develops a mass, the light-by-light scattering amplitude becomes noncovariant, and the coupling constant is renormalized even in the quenched version of the theory. Gauge invariance does not preclude the appearance of such counterterms in the linearized theory because the formulation is nonlocal. C1 FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210. RP BODWIN, GT (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 17 TC 1 Z9 1 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 15 PY 1991 VL 44 IS 12 BP 3924 EP 3930 DI 10.1103/PhysRevD.44.3924 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GX138 UT WOS:A1991GX13800026 ER PT J AU ROULET, E AF ROULET, E TI E6 LEPTOQUARKS AND THE SOLAR-NEUTRINO PROBLEM SO PHYSICAL REVIEW D LA English DT Note ID OSCILLATIONS; MATTER AB The possibility that nonconventional neutrino oscillations take place in the superstring-inspired E6 models is considered. In this context, the influence of leptoquark-mediated interactions of the neutrinos with nucleons in the resonant flavor conversion is discussed. It is shown that this effect can be significant for nu-e-nu-tau oscillations if these neutrinos have the masses required in the ordinary Mikheyev-Smirnov-Wolfenstein effect, and may lead to a solution of the solar-neutrino problem even in the absence of vacuum mixings. On the other hand, this model cannot lead to resonant behavior in the Sun if the neutrinos are massless. RP ROULET, E (reprint author), NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 12 TC 1 Z9 1 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 15 PY 1991 VL 44 IS 12 BP 3971 EP 3973 DI 10.1103/PhysRevD.44.3971 PG 3 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GX138 UT WOS:A1991GX13800033 ER PT J AU VANDERMEULEN, P KRAUSE, MO CALDWELL, CD WHITFIELD, SB DELANGE, CA AF VANDERMEULEN, P KRAUSE, MO CALDWELL, CD WHITFIELD, SB DELANGE, CA TI AUTOIONIZATION RESONANCES IN ATOMIC CHLORINE - THE 3S3P5(3PO(2),1,0)NP RYDBERG SERIES SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Letter ID QUANTUM-DEFECT THEORY; OPEN-SHELL ATOMS; PHOTO-IONIZATION; CROSS-SECTION; PHOTOIONIZATION; CL AB The Cl 3s(2)3p5(2P3/2-degrees) --> 3s3p5(3P2,1,0-degrees)np (n greater-than-or-equal-to 4) autoionizing Rydberg series are studied by monitoring the partial photoionization cross section of the Cl+ 3s(2)3p4(3P(e)) ionic state between 21.75 eV and 24.75 eV. The Rydberg series converging upon the 3s-1 3P2-degrees, 3P1-degrees and 3P0-degrees ionization limits are clearly resolved, and Rydberg levels up to n = 14 are identified. The present experimental results for the Cl 3s --> np Rydberg series are compared with those of the analogous series in Ar, and with theoretical results of a non-relativistic MBPT calculation. C1 UNIV CENT FLORIDA,DEPT PHYS,ORLANDO,FL 32816. UNIV AMSTERDAM,DEPT PHYS CHEM,1018 WS AMSTERDAM,NETHERLANDS. RP VANDERMEULEN, P (reprint author), OAK RIDGE NATL LAB,DIV CHEM,POB 2008,OAK RIDGE,TN 37831, USA. NR 24 TC 17 Z9 17 U1 0 U2 0 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 DEC 14 PY 1991 VL 24 IS 23 BP L573 EP L578 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GW740 UT WOS:A1991GW74000003 ER PT J AU BAUER, JD CALEF, DF AF BAUER, JD CALEF, DF TI HARMONIC-ANALYSIS OF PHONON ECHOES IN LIQUIDS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID NORMAL-MODE ANALYSIS; MOLECULAR-DYNAMICS AB We present, for the first time, a study comparing phonon quench echoes in supercooled liquid argon with a normal mode analysis of the echoes. The phonon echoes are produced via molecular dynamics simulation. We model the echoes by considering a collection of harmonic oscillators whose frequency distribution is defined by the density of normal modes in the liquid under consideration. We find for times less than 300 fs, the fluid behaves in a relatively harmonic manner. We also find that low temperatures and short times are best suited to harmonic analysis. We comment on the agreement and deviation between simulation and model particularly as dephasing processes are concerned. Future approaches to this phenomenon are addressed as well. RP BAUER, JD (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 808 L-282,LIVERMORE,CA 94550, USA. NR 10 TC 10 Z9 10 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD DEC 13 PY 1991 VL 187 IS 4 BP 391 EP 395 DI 10.1016/0009-2614(91)80270-8 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GX460 UT WOS:A1991GX46000008 ER PT J AU LYDEARD, C WOOTEN, MC SMITH, MH AF LYDEARD, C WOOTEN, MC SMITH, MH TI OCCURRENCE OF GAMBUSIA-AFFINIS IN THE SAVANNAH AND CHATTAHOOCHEE DRAINAGES - PREVIOUSLY UNDESCRIBED GEOGRAPHIC CONTACTS BETWEEN G-AFFINIS AND G-HOLBROOKI SO COPEIA LA English DT Note ID SYSTEMATICS C1 SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. UNIV GEORGIA,DEPT ZOOL,ATHENS,GA 30602. UNIV GEORGIA,DEPT GENET,ATHENS,GA 30602. UNIV GEORGIA,DEPT ECOL,ATHENS,GA 30602. UNIV GEORGIA,SCH FOREST RESOURCES,ATHENS,GA 30602. RP LYDEARD, C (reprint author), AUBURN UNIV,DEPT ZOOL & WILDLIFE SCI,AUBURN,AL 36849, USA. NR 13 TC 5 Z9 6 U1 1 U2 2 PU AMER SOC ICHTHYOLOGISTS HERPETOLOGISTS BUSINESS OFFICE PI CARBONDALE PA SOUTHERN ILLINOIS UNIV, DEPT ZOOLOGY, CARBONDALE, IL 62901-6501 SN 0045-8511 J9 COPEIA JI Copeia PD DEC 13 PY 1991 IS 4 BP 1111 EP 1116 DI 10.2307/1446109 PG 6 WC Zoology SC Zoology GA GW221 UT WOS:A1991GW22100026 ER PT J AU BRANDT, LA AF BRANDT, LA TI GROWTH OF JUVENILE ALLIGATORS IN PAR POND, SAVANNAH RIVER SITE, SOUTH-CAROLINA SO COPEIA LA English DT Note ID NORTHERN AUSTRALIA; RATES C1 FLORIDA INT UNIV,DEPT BIOL SCI,MIAMI,FL 33199. SAVANNAH RIVER ECOL LAB,AIKEN,SC 29801. NR 18 TC 15 Z9 16 U1 1 U2 4 PU AMER SOC ICHTHYOLOGISTS HERPETOLOGISTS BUSINESS OFFICE PI CARBONDALE PA SOUTHERN ILLINOIS UNIV, DEPT ZOOLOGY, CARBONDALE, IL 62901-6501 SN 0045-8511 J9 COPEIA JI Copeia PD DEC 13 PY 1991 IS 4 BP 1123 EP 1129 PG 7 WC Zoology SC Zoology GA GW221 UT WOS:A1991GW22100029 ER PT J AU PARK, JK AF PARK, JK TI A SPECIAL CASE OF THE N-VERTEX TRAVELING-SALESMAN PROBLEM THAT CAN BE SOLVED IN O(N) TIME SO INFORMATION PROCESSING LETTERS LA English DT Article DE DESIGN OF ALGORITHMS; ANALYSIS OF ALGORITHMS; COMBINATORIAL PROBLEMS; THE TRAVELING-SALESMAN PROBLEM; DYNAMIC PROGRAMMING; MONGE ARRAYS ID ALGORITHM AB The traveling-salesman problem, though in general NP-hard, possesses several special cases that can be solved in polynomial time. In particular, when the cost array C associated with an n-vertex traveling-salesman problem satisfies what are known as the Demidenko conditions, then a minimum-cost traveling-salesman tour can be computed in O(n2) time using a simple dynamic-programming algorithm. In this paper, we identify a subset-LAMBDA of the set of all cost arrays satisfying the Demidenko conditions, such that for any C is-an-element-of LAMBDA, the running time of the aforementioned dynamic-programming algorithm can be reduced to O(n). We obtain this speedup using recently developed techniques for on-line searching in Monge arrays. RP PARK, JK (reprint author), SANDIA NATL LABS,DIV THEORET COMP SCI 1423,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 14 TC 31 Z9 31 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0020-0190 J9 INFORM PROCESS LETT JI Inf. Process. Lett. PD DEC 13 PY 1991 VL 40 IS 5 BP 247 EP 254 DI 10.1016/0020-0190(91)90118-2 PG 8 WC Computer Science, Information Systems SC Computer Science GA HA557 UT WOS:A1991HA55700004 ER PT J AU OHRINER, EK GEORGE, EP AF OHRINER, EK GEORGE, EP TI GROWTH OF INTERMETALLIC LAYERS IN THE IRIDIUM MOLYBDENUM SYSTEM SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article AB Growth of intermetallic layers between molybdenum and an iridium alloy (Ir-0.3 wt.%W-0.006 wt.%Th-0.005 wt.%Al) has been evaluated over the temperature range 1473-1748 K, in argon and in vacuum. Two intermetallic layers, with compositions corresponding to IrMo and Ir3Mo, are formed over the entire temperature range. The two layers have approximately equal thicknesses, and the total layer thickness formed during a 4 h exposure can be expressed as t = 1200 exp(-Q/RT), where t is the total thickness of the intermetallic layers in micrometers, Q = 64 kJ mol-1, R is the gas constant, and T is the absolute temperature. Vapor-phase transport of molybdenum (as MoO3) is suggested as a possible mechanism for the growth of these intermetallic layers in (oxygen-contaminated) argon. There was no indication of molybdenum transport through the iridium alloy grain boundaries in advance of the intermetallic layer interface. The resistance of these intermetallics to attack by several acids and acid mixtures is similar to that of iridium. RP OHRINER, EK (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. RI George, Easo/L-5434-2014 NR 3 TC 6 Z9 6 U1 0 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD DEC 13 PY 1991 VL 177 IS 2 BP 219 EP 227 DI 10.1016/0925-8388(91)90075-7 PG 9 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA GX407 UT WOS:A1991GX40700007 ER PT J AU GARRETT, BC TRUHLAR, DG AF GARRETT, BC TRUHLAR, DG TI CRITICAL TESTS OF VARIATIONAL TRANSITION-STATE THEORY AND SEMICLASSICAL TUNNELING METHODS FOR HYDROGEN AND DEUTERIUM ATOM TRANSFER-REACTIONS AND USE OF THE SEMICLASSICAL CALCULATIONS TO INTERPRET THE OVERBARRIER AND TUNNELING DYNAMICS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID POTENTIAL-ENERGY SURFACE; CHEMICAL-REACTION RATES; SUDDEN DISTORTED-WAVE; TRANSFER-REACTION CL+HCL->CLH+CL; NEGATIVE ACTIVATION-ENERGIES; QUANTAL RATE CONSTANTS; H-2 REVERSIBLE CH4+H; REACTION-PATH; COLLINEAR REACTIONS; OSCILLATING REACTIVITY AB Variational transition state theory with semiclassical tunneling calculations is used to calculate rate constants which are compared to the best available quantum mechanical results for three cases involving H atom transfer and three cases involving D atom transfer. The Mass combination is heavy-light-heavy, as appropriate for testing semiclassical methods for proton and deuteron (or hydride) transfer in organic and biochemical systems. In five of the six cases at 312.5 K and five (but not the same five) of the six cases at 423.2 K, semiclassical results based on an uncoupled treatment of the vibrational-rotational modes agree with the the best available quantum results within the reliability of the latter. In the other two cases the discrepancies are larger, a factor of 3.1 at 312.5 K and a factor of 2.3 at 423.2 K, and possible reasons for this are discussed. In particular, the effect of a coupled treatment of the bending degrees of freedom in these two cases is presented and compared to the uncoupled treatment. Coupling the bending modes reduces the maximum discrepancy at 312.5 K to a factor of 2.4 but increases the largest discrepancy al 423.2 K to a factor of 4.5. The approximate semiclassical calculations are used to interpret the dynamics, especially in cases where agreement with the fully quantal results is very good. C1 UNIV MINNESOTA, DEPT CHEM, MINNEAPOLIS, MN 55455 USA. UNIV MINNESOTA, INST SUPERCOMP, MINNEAPOLIS, MN 55455 USA. RP GARRETT, BC (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RI Garrett, Bruce/F-8516-2011; Truhlar, Donald/G-7076-2015 OI Truhlar, Donald/0000-0002-7742-7294 NR 75 TC 53 Z9 53 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 DEC 12 PY 1991 VL 95 IS 25 BP 10374 EP 10379 DI 10.1021/j100178a025 PG 6 WC Chemistry, Physical SC Chemistry GA GU911 UT WOS:A1991GU91100025 ER PT J AU TRENT, JD NIMMESGERN, E WALL, JS HARTL, FU HORWICH, AL AF TRENT, JD NIMMESGERN, E WALL, JS HARTL, FU HORWICH, AL TI A MOLECULAR CHAPERONE FROM A THERMOPHILIC ARCHAEBACTERIUM IS RELATED TO THE EUKARYOTIC PROTEIN T-COMPLEX POLYPEPTIDE-1 SO NATURE LA English DT Article ID RIBULOSE BISPHOSPHATE CARBOXYLASE; ESCHERICHIA-COLI; HEAT-SHOCK; RIBULOSEBISPHOSPHATE-CARBOXYLASE; MITOCHONDRIAL PROTEIN; ATP HYDROLYSIS; GENE; CLONING; PURIFICATION; SEQUENCE AB THERE is evidence to suggest that components of archaebacteria are evolutionarily related to cognates in the eukaryotic cytosol 1-7. We postulated that the major heat-shock protein of the thermophilic archaebacterium, Sulfolobus shibatae, is a molecular chaperone and that it is related to an as-yet unidentified chaperone component in the eukaryotic cytosol. Acquired thermotolerance in S. shibatae correlates with the predominant synthesis of this already abundant protein, referred to as thermophilic factor 55 (TF55; ref. 8). TF55 is a homo-oligomeric complex of two stacked 9-membered rings, closely resembling the 7-membered-ring complexes of the chaperonins, groEL, hsp60 and Rubisco-binding protein 9-15. The TF55 complex binds unfolded polypeptides in vitro and has ATPase activity-features consistent with its being a molecular chaperone 16,17. The primary structure of TF55, however, is not significantly related to the chaperonins. On the other hand, it is highly homologous (36-40% identity) to a ubiquitous eukaryotic protein, t-complex polypeptide-1 (TCP1; refs 18-20). In Saccharomyces cerevisiae, TCP1 is an essential protein that may play a part in mitotic spindle formation 21. We suggest that TF55 in archaebacteria and TCP1 in the eukaryotic cytosol are members of a new class of molecular chaperones. C1 YALE UNIV,SCH MED,DEPT GENET,NEW HAVEN,CT 06510. SLOAN KETTERING MEM CANC CTR,ROCKEFELLER RES LAB,CELLULAR BIOCHEM & BIOPHYS PROGRAM,NEW YORK,NY 10021. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RP TRENT, JD (reprint author), YALE UNIV,SCH MED,HOWARD HUGHES MED INST,333 CEDAR ST,NEW HAVEN,CT 06510, USA. NR 43 TC 274 Z9 279 U1 0 U2 8 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD DEC 12 PY 1991 VL 354 IS 6353 BP 490 EP 493 DI 10.1038/354490a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GV078 UT WOS:A1991GV07800064 PM 1836250 ER PT J AU BLOCK, MM WHITE, AR AF BLOCK, MM WHITE, AR TI CAN WE USE ASYMPTOTIC ANALYTIC AMPLITUDE ANALYSIS IN THE ENERGY REGION 5-1800 GEV SO PHYSICS LETTERS B LA English DT Article ID PP ELASTIC-SCATTERING; TOTAL CROSS-SECTIONS; PBARP; TEV; COLLIDER; ISR AB We make an asymptotic analytic amplitude analysis of the t = 0 parameters (sigma(tot) and rho-values) for ppBAR and pp collisions, in the energy region square-root s = 5-1800 GeV. The parameters of all fits are essentially determined by the data at ISR energies and below. We find that, with or without a maximal odderon present: (1) the best fit with log2 (s/s0) dependence, does not fit the higher-energy cross-section data; (2) a log (s/s0) dependence fits all the cross-section data well, but not the UA4 rho-value at 546 GeV. Our general conclusion is that such asymptotic fits do not lend support to either a log2s behavior for the total cross-section, or to the hypothesis of an asymptotically maximal odderon. We also emphasize that in all likelihood the energy region studied is simply too low to be in "asymptopia". C1 ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439. RP BLOCK, MM (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. NR 31 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 DEC 12 PY 1991 VL 273 IS 1-2 BP 145 EP 155 DI 10.1016/0370-2693(91)90569-C PG 11 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GX675 UT WOS:A1991GX67500027 ER PT J AU HAN, T WILLENBROCK, S AF HAN, T WILLENBROCK, S TI QCD CORRECTION TO THE PP-] WH AND ZH TOTAL CROSS-SECTIONS SO PHYSICS LETTERS B LA English DT Article ID HIGGS-BOSON PRODUCTION; HEAVY-QUARK FUSION; DECAYS AB We calculated the QCD correction to the total cross section for the production of a Higgs boson in association with a W or Z boson at the LHC/SSC. The QCD-corrected cross section is insensitive to the choice of factorization and renormalization scales. Setting these scales to the invariant mass of the VH final state, the QCD correction increases the lowest-order cross section by about 17%/15% in the DIS factorization scheme, and 12%/10% in the MSBAR scheme, at the LHC/SSC. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP HAN, T (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 26 TC 160 Z9 160 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 DEC 12 PY 1991 VL 273 IS 1-2 BP 167 EP 172 DI 10.1016/0370-2693(91)90572-8 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GX675 UT WOS:A1991GX67500030 ER PT J AU DECAMP, D DESCHIZEAUX, B GOY, C LEES, JP MINARD, MN ALEMANY, R CRESPO, JM DELFINO, M FERNANDEZ, E GAITAN, V GARRIDO, L MIR, LM PACHECO, A CATANESI, MG CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G GAO, Y HU, H HUANG, D HUANG, X LIN, J LOU, J QIAO, C RUAN, T WANG, T XIE, Y XU, D XU, R ZHANG, J ZHAO, W ATWOOD, WB BAUERDICK, LAT BIRD, F BLUCHER, E BONVICINI, G BOSSI, F BOUDREAU, J BURNETT, TH DREVERMANN, H FORTY, RW GRAB, C HAGELBERG, R HAYWOOD, S HILGART, J JOST, B KASEMANN, M KNOBLOCH, J LACOURT, A LANCON, E LEHRAUS, I LOHSE, T LUSIANI, A MARCHIORO, A MARTINEZ, M MATO, P MENARY, S MEYER, T MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG NASH, J PALAZZI, P RANJARD, F REDLINGER, G ROLANDI, L ROTH, A ROTHBERG, J ROTSCHEIDT, H SAICH, M SCHLATTER, D SCHMELLING, M TEJESSY, W WACHSMUTH, H WASSERBAECH, S WIEDENMANN, W WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M BENCHEIKH, AM ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PRORIOL, J PRULHIERE, F STIMPFL, G HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I SIMOPOULOU, E VAYAKI, A BADIER, J BLONDEL, A BONNEAUD, G BRIENT, JC FOUQUE, G GAMESS, A HARVEY, J ORTEU, S ROSOWSKY, A ROUGE, A RUMPF, M TANAKA, R VIDEAU, H CANDLIN, DJ VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P ZOGRAFOU, P ALTOON, B BOYLE, O COLRAIN, P HALLEY, AW TENHAVE, I LYNCH, JG MAITLAND, W MORTON, WT RAINE, C SCARR, JM SMITH, K THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEIGES, R GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M DORNAN, PJ DUGEAY, S GREENE, AM HASSARD, JF LIESKE, NM PATTON, SJ PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TAYLOR, G TOMALIN, IR WRIGHT, AG GIRTLER, P KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G KEEMER, NR NUTTALL, M PATEL, A ROWLINGSON, BS SLOAN, T SNOW, SW WHELAN, EP BARCZEWSKI, T KLEINKNECHT, K RAAB, J RENK, B ROEHN, S SANDER, HG SCHMIDT, H STEEG, F WALTHER, SM WOLF, B AUBERT, JJ BENCHOUK, C BERNARD, V BONISSENT, A CARR, J COYLE, P DRINKARD, J ETIENNE, F PAPALEXIOU, S PAYRE, P PIETRZYK, B QIAN, Z ROUSSEAU, D SCHWEMLING, P TALBY, M ADLUNG, S BECKER, H BLUM, W BROWN, D CATTANEO, P COWAN, G DEHNING, B DIETL, H DYDAK, F FERNANDEZBOSMAN, M HANSLKOZANECKA, T JAHN, A KOZANECKI, W LANGE, E LAUBER, J LUTJENS, G LUTZ, G MANNER, W PAN, Y RICHTER, R SCHRODER, J SCHWARZ, AS SETTLES, R STIERLIN, U STDENIS, R TAKASHIMA, M THOMAS, J WOLF, G BERTIN, V BOUCROT, J CALLOT, O CHEN, X CORDIER, A DAVIER, M GRIVAZ, JF GROS, MH HEUSSE, P JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM VEILLET, JJ VIDEAU, I ZHANG, Z ZOMER, F ABBANEO, D AMENDOLIA, SR BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BRADASCHIA, C CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GATTO, C GIASSI, A GIORGI, MA LIGABUE, F MANNELLI, EB MARROCCHESI, PS MESSINEO, A PALLA, F SANGUINETTI, G STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J CARTER, JM GREEN, MG MARCH, PV MEDCALF, T QUAZI, IS STRONG, JA WEST, LR WILDISH, T BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P LOCCI, E LOUCATOS, S MONNIER, E PEREZ, P PERLAS, JA PERRIER, F RANDER, J RENARDY, JF ROUSSARIE, A SCHULLER, JP SCHWINDLING, J VALLAGE, B ASHMAN, JG BOOTH, CN BUTTAR, C CARNEY, RE CARTWRIGHT, S COMBLEY, F DOGRU, M HATFIELD, F MARTIN, J PARKER, D REEVES, P THOMPSON, LF BARBERIO, E BRANDT, S GRUPEN, C MEINHARD, H MIRABITO, L SCHAFER, U SEYWERD, H GANIS, G GIANNINI, G GOBBO, B RAGUSA, F STIEGLER, U BELLANTONI, L CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JARED, RC JOHNSON, RP LECLAIRE, BW LISHKA, C PAN, YB PATER, JR SAADI, Y SHARMA, V SHI, ZH TANG, YH WALSH, AM WEAR, JA WEBER, FV WHITNEY, MH WU, SL ZOBERNIG, G AF DECAMP, D DESCHIZEAUX, B GOY, C LEES, JP MINARD, MN ALEMANY, R CRESPO, JM DELFINO, M FERNANDEZ, E GAITAN, V GARRIDO, L MIR, LM PACHECO, A CATANESI, MG CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G GAO, Y HU, H HUANG, D HUANG, X LIN, J LOU, J QIAO, C RUAN, T WANG, T XIE, Y XU, D XU, R ZHANG, J ZHAO, W ATWOOD, WB BAUERDICK, LAT BIRD, F BLUCHER, E BONVICINI, G BOSSI, F BOUDREAU, J BURNETT, TH DREVERMANN, H FORTY, RW GRAB, C HAGELBERG, R HAYWOOD, S HILGART, J JOST, B KASEMANN, M KNOBLOCH, J LACOURT, A LANCON, E LEHRAUS, I LOHSE, T LUSIANI, A MARCHIORO, A MARTINEZ, M MATO, P MENARY, S MEYER, T MINTEN, A MIOTTO, A MIQUEL, R MOSER, HG NASH, J PALAZZI, P RANJARD, F REDLINGER, G ROLANDI, L ROTH, A ROTHBERG, J ROTSCHEIDT, H SAICH, M SCHLATTER, D SCHMELLING, M TEJESSY, W WACHSMUTH, H WASSERBAECH, S WIEDENMANN, W WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M BENCHEIKH, AM ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PRORIOL, J PRULHIERE, F STIMPFL, G HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I SIMOPOULOU, E VAYAKI, A BADIER, J BLONDEL, A BONNEAUD, G BRIENT, JC FOUQUE, G GAMESS, A HARVEY, J ORTEU, S ROSOWSKY, A ROUGE, A RUMPF, M TANAKA, R VIDEAU, H CANDLIN, DJ VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P ZOGRAFOU, P ALTOON, B BOYLE, O COLRAIN, P HALLEY, AW TENHAVE, I LYNCH, JG MAITLAND, W MORTON, WT RAINE, C SCARR, JM SMITH, K THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEIGES, R GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M DORNAN, PJ DUGEAY, S GREENE, AM HASSARD, JF LIESKE, NM PATTON, SJ PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TAYLOR, G TOMALIN, IR WRIGHT, AG GIRTLER, P KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G KEEMER, NR NUTTALL, M PATEL, A ROWLINGSON, BS SLOAN, T SNOW, SW WHELAN, EP BARCZEWSKI, T KLEINKNECHT, K RAAB, J RENK, B ROEHN, S SANDER, HG SCHMIDT, H STEEG, F WALTHER, SM WOLF, B AUBERT, JJ BENCHOUK, C BERNARD, V BONISSENT, A CARR, J COYLE, P DRINKARD, J ETIENNE, F PAPALEXIOU, S PAYRE, P PIETRZYK, B QIAN, Z ROUSSEAU, D SCHWEMLING, P TALBY, M ADLUNG, S BECKER, H BLUM, W BROWN, D CATTANEO, P COWAN, G DEHNING, B DIETL, H DYDAK, F FERNANDEZBOSMAN, M HANSLKOZANECKA, T JAHN, A KOZANECKI, W LANGE, E LAUBER, J LUTJENS, G LUTZ, G MANNER, W PAN, Y RICHTER, R SCHRODER, J SCHWARZ, AS SETTLES, R STIERLIN, U STDENIS, R TAKASHIMA, M THOMAS, J WOLF, G BERTIN, V BOUCROT, J CALLOT, O CHEN, X CORDIER, A DAVIER, M GRIVAZ, JF GROS, MH HEUSSE, P JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM VEILLET, JJ VIDEAU, I ZHANG, Z ZOMER, F ABBANEO, D AMENDOLIA, SR BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BRADASCHIA, C CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GATTO, C GIASSI, A GIORGI, MA LIGABUE, F MANNELLI, EB MARROCCHESI, PS MESSINEO, A PALLA, F SANGUINETTI, G STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J CARTER, JM GREEN, MG MARCH, PV MEDCALF, T QUAZI, IS STRONG, JA WEST, LR WILDISH, T BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P LOCCI, E LOUCATOS, S MONNIER, E PEREZ, P PERLAS, JA PERRIER, F RANDER, J RENARDY, JF ROUSSARIE, A SCHULLER, JP SCHWINDLING, J VALLAGE, B ASHMAN, JG BOOTH, CN BUTTAR, C CARNEY, RE CARTWRIGHT, S COMBLEY, F DOGRU, M HATFIELD, F MARTIN, J PARKER, D REEVES, P THOMPSON, LF BARBERIO, E BRANDT, S GRUPEN, C MEINHARD, H MIRABITO, L SCHAFER, U SEYWERD, H GANIS, G GIANNINI, G GOBBO, B RAGUSA, F STIEGLER, U BELLANTONI, L CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JARED, RC JOHNSON, RP LECLAIRE, BW LISHKA, C PAN, YB PATER, JR SAADI, Y SHARMA, V SHI, ZH TANG, YH WALSH, AM WEAR, JA WEBER, FV WHITNEY, MH WU, SL ZOBERNIG, G TI MEASUREMENT OF THE CHARGED-PARTICLE MULTIPLICITY DISTRIBUTION IN HADRONIC-Z DECAYS SO PHYSICS LETTERS B LA English DT Article ID E+E ANNIHILATION; PETRA ENERGIES; PP COLLISIONS; MONTE-CARLO; FRAGMENTATION; QUARK AB The charged particle multiplicity distribution of hadronic Z decays was measured on the peak of the Z resonance using the ALEPH detector at LEP. Using a model independent unfolding procedure the distribution was found to have a mean = 20.85 +/- 0.24 and a dispersion D = 6.34 +/- 0.12. Comparison with lower energy data supports the KNO scaling hypothesis in the energy range square-root s = 29-91.25 GeV. At square-root s = 91.25 GeV the shape of the multiplicity distribution is well described by a log-normal distribution, as predicted from a cascading model for multi-particle production. The same model also successfully describes the energy dependence of the mean and width of the multiplicity distribution. A next-to-leading order QCD prediction in the frame-work of the modified leading-log approximation and local parton-hadron duality is found to fit the energy dependence of the mean but not the width of the charged multiplicity distribution, indicating that the width of the multiplicity distribution is a sensitive probe for higher order QCD or non-perturbative effects. C1 UNIV AUTONOMA BARCELONA,FIS ALTAS ENGN,E-08193 BARCELONA,SPAIN. IST NAZL FIS NUCL,SEZ BARI,I-70126 BARI,ITALY. UNIV BARI,DIPARTMENTO FIS,I-70126 BARI,ITALY. CHINESE ACAD SCI,INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA. CERN,EUROPEAN LAB PARTICLE PHYS,CH-1211 GENEVA 23,SWITZERLAND. UNIV CLERMONT FERRAND,PHYS CORPUSCULAIRE LAB,F-63177 CLERMONT FERRAND,FRANCE. NIELS BOHR INST,DK-2100 COPENHAGEN,DENMARK. DEMOCRITOS NUCL RES CTR,ATHENS,GREECE. ECOLE POLYTECH,INST NATL PHYS NUCL & PHYS PARTICULES,CNRS,F-91128 PALAISEAU,FRANCE. UNIV EDINBURGH,DEPT PHYS,EDINBURGH EH9 3JZ,MIDLOTHIAN,SCOTLAND. UNIV FLORENCE,DIPARTMENTO 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. FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306. IST NAZL FIS NUCL,LAB NAZL,I-00044 FRASCATI,ITALY. UNIV GLASGOW,DEPT PHYS & ASTRON,GLASGOW G12 8QQ,SCOTLAND. UNIV HEIDELBERG,INST HOCHENERGIEPHYS,W-6900 HEIDELBERG,GERMANY. UNIV LONDON IMPERIAL COLL SCI & TECHNOL,DEPT PHYS,LONDON SW7 2BZ,ENGLAND. UNIV INNSBRUCK,DEPT EXPTL PHYS,A-6020 INNSBRUCK,AUSTRIA. UNIV LANCASTER,DEPT PHYS,LANCASTER LA1 4YB,ENGLAND. UNIV MAINZ,INST PHYS,W-6500 MAINZ,GERMANY. FAC SCI LUMINY,INST NATL PHYS & PHYS PARTICULES,CNRS,CTR PHYS PARTICULES,F-13288 MARSEILLE,FRANCE. MAX PLANCK INST PHYS & ASTROPHYS,WERNER HEISENBERG INST PHYS,W-8000 MUNICH 40,GERMANY. UNIV PARIS 11,INST NATL PHYS & PHYS PARTICULES,CNRS,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE. UNIV PISA,DIPARTMENTO FIS,I-56100 PISA,ITALY. IST NAZL FIS NUCL,SEZ PISA,I-56010 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56010 PISA,ITALY. UNIV LONDON,ROYAL HOLLOWAY & BEDFORD NEW COLL,DEPT PHYS,SURREY TW20 0EX,ENGLAND. RUTHERFORD APPLETON LAB,DEPT PARTICLE PKYS,DIDCOT OX11 0QX,OXON,ENGLAND. CENS,DEPT PHYS PARTICULES ELEMENTAIRES,F-91191 GIF SUR YVETTE,FRANCE. UNIV SHEFFIELD,DEPT PHYS,SHEFFIELD S3 7RH,S YORKSHIRE,ENGLAND. UNIV SIEGEN,FACHBERICH PHYS,W-5900 SIEGEN,GERMANY. UNIV TRIESTE,DIPARTMENTO FIS,I-34127 TRIESTE,ITALY. IST NAZL FIS NUCL,SEZ TRIESTE,I-34127 TRIESTE,ITALY. UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. SLAC,STANFORD,CA 94309. UNIV WASHINGTON,SEATTLE,WA 98195. UNIV TURIN,IST FIS GEN,I-10124 TURIN,ITALY. CNR,IST COSMOGEOFIS,TURIN,ITALY. CERN,PPE DIV,CH-1211 GENEVA 23,SWITZERLAND. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP DECAMP, D (reprint author), INST NATL PHYS NUCL & PHYS PARTICULES,CNRS,PHYS PARTICULES LAB,F-74019 ANNEY LE VIEUX,FRANCE. RI ANTONELLI, ANTONELLA/C-6238-2011; Bosman, Martine/J-9917-2014; Buttar, Craig/D-3706-2011; Stahl, Achim/E-8846-2011; St.Denis, Richard/C-8997-2012; Forti, Francesco/H-3035-2011; Focardi, Ettore/E-7376-2012; Venturi, Andrea/J-1877-2012; Perrier, Frederic/A-5953-2011; Rolandi, Luigi (Gigi)/E-8563-2013; Colas, Paul/F-2876-2013; Delfino, Manuel/A-1545-2012; Ligabue, Franco/F-3432-2014; Fernandez, Enrique/L-5387-2014; Mir, Lluisa-Maria/G-7212-2015; ciocci, maria agnese /I-2153-2015; Hansen, John/B-9058-2015; Lusiani, Alberto/N-2976-2015; Marrocchesi, Pier Simone/N-9068-2015; Lusiani, Alberto/A-3329-2016; Murtas, Fabrizio/B-5729-2012; Booth, Christopher/B-5263-2016; Pacheco Pages, Andres/C-5353-2011; Ferrante, Isidoro/F-1017-2012; OI Bosman, Martine/0000-0002-7290-643X; Stahl, Achim/0000-0002-8369-7506; Forti, Francesco/0000-0001-6535-7965; Focardi, Ettore/0000-0002-3763-5267; Rolandi, Luigi (Gigi)/0000-0002-0635-274X; Delfino, Manuel/0000-0002-9468-4751; 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; Murtas, Fabrizio/0000-0002-7041-6541; Garrido Beltran, Lluis/0000-0001-8883-6539; Edgecock, Rob/0000-0002-7896-3312; Miquel, Ramon/0000-0002-6610-4836; Fernandez, Enrique/0000-0002-6405-9488; Mir, Lluisa-Maria/0000-0002-4276-715X; ciocci, maria agnese /0000-0003-0002-5462; Hansen, John/0000-0002-8422-5543; Lusiani, Alberto/0000-0002-6876-3288; Marrocchesi, Pier Simone/0000-0003-1966-140X; Lusiani, Alberto/0000-0002-6876-3288; Booth, Christopher/0000-0002-6051-2847; Pacheco Pages, Andres/0000-0001-8210-1734; Ferrante, Isidoro/0000-0002-0083-7228; Palazzi, Paolo/0000-0002-4861-391X NR 36 TC 65 Z9 65 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 DEC 12 PY 1991 VL 273 IS 1-2 BP 181 EP 192 DI 10.1016/0370-2693(91)90575-B PG 12 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GX675 UT WOS:A1991GX67500033 ER PT J AU GULOY, AM CORBETT, JD AF GULOY, AM CORBETT, JD TI SYNTHESES AND STRUCTURES OF LAGE2-X AND LAALGE - INTERRELATIONSHIPS AMONG THE ALPHA-THSI2, ALPHA-GDSI2, AND LAPTSI STRUCTURE TYPES SO INORGANIC CHEMISTRY LA English DT Article AB Alpha-LeGe2-x has been synthesized by powder sintering and shown to have the composition range 0.33 less-than-or-equal-to x less-than-or-equal-to 0.40 and the orthorhombic alpha-GdSi2-type structure (Imma, Z = 4) with deviations from near-tetragonal dimensions that increase with decreasing x. The structure of LaGe1.60(1) at 20-degrees-C was refined from single-crystal data (a = 4.2680 (7), b = 4.2735 (6), c = 14.404 (1) angstrom; R, R(w) = 2.5%, 2.3%) with the germanium deficiency predominantly on one of two independent non-metal sites. The allowed second-order phase transition of alpha-LaGe2-x to the beta-form in the tetragonal alpha-ThSi2-type structure (I4(1)/amd) has been observed by powder diffractometry over the range of 425-635-degrees-C with decreasing x. The structural nature of the transition is described. The TbGe1.67 superstructure reported in space group Fdd2 is noted to also be consistent with a second-order transition from a high-temperature alpha-ThSi2-type structure. The fully stoichiometric Zintl phase LaAlGe was synthesized and shown to exist in the ordered LaPtSi version of the ThSi2 structure (I4(1)md; Z = 4; a = 4.336 (1), c = 14.828 (5) angstrom; R, R(w) = 3.2%, 2.1%). The stability of tetragonal, fully stoichiometric LaAlxGe2-x extends well into the ternary system to x less-than-or-equal-to 0.2. Oxygen has a similar effect and stabilizes tetragonal LaGe2-x(O) (with small x) at room temperature. 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 27 Z9 27 U1 4 U2 14 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD DEC 11 PY 1991 VL 30 IS 25 BP 4789 EP 4794 DI 10.1021/ic00025a021 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA GT938 UT WOS:A1991GT93800021 ER PT J AU HUSTON, P ESPENSON, JH BAKAC, A AF HUSTON, P ESPENSON, JH BAKAC, A TI ALKYL RADICAL COLLIGATION AND RELEASE BY A CHROMIUM MACROCYCLE SO INORGANIC CHEMISTRY LA English DT Article ID CARBON BOND; PHOTOCHEMICAL GENERATION; METHYL RADICALS; COMPLEXES; KINETICS; COBALT(III); IONS; REACTIVITY; MECHANISMS; RADIOLYSIS AB Alkyl radicals, generated from the photohomolysis of organocobalt complexes, were allowed to react in aqueous solution with (H2O)2CrL2+ (L = 1,4,8,12-tetraazacyclopentadecane or [15]aneN4). The reaction rates were evaluated by laser flash photolysis, using the known reaction between R. and the methyl viologen radical cation as a kinetic probe. Data were obtained for reactions of 13 radicals. The rate constants span a narrow range, (6-19) x 10(7) L mol-1 s-1 at 25-degrees-C. The decomposition of CH3CH-(OH)CrL(H2O)2+ takes place by concurrent homolysis and beta-elimination. At 25-degrees-C the overall rate constant has a value (1.60 +/- 0.15) x 10(-4) s-1 independent of [H+]. The complexes with R = CH2OH and CH2OCH3 undergo decomposition too slowly for detection. Equilibrium constants for radical binding calculated from forward and reverse rate constants are log K298 = 11.23 (CH(CH3)2) and 12.19 (CH2C6H5). The kinetic and equilibrium data are discussed in terms of a reaction model featuring concurrent Cr-C and Cr-OH2 bond making and bond breaking. Results for analogous reactions are compared. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 41 TC 15 Z9 15 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 DEC 11 PY 1991 VL 30 IS 25 BP 4826 EP 4830 DI 10.1021/ic00025a027 PG 5 WC Chemistry, Inorganic & Nuclear SC Chemistry GA GT938 UT WOS:A1991GT93800027 ER PT J AU ESPENSON, JH BAKAC, A KIM, JH AF ESPENSON, JH BAKAC, A KIM, JH TI KINETICS AND MECHANISM OF THE OXIDATION OF HEXAAQUAVANADIUM(II) IONS BY ALKYL RADICALS SO INORGANIC CHEMISTRY LA English DT Article ID ELECTRON-TRANSFER REACTIONS; TRANSITION-METAL COMPLEXES; ALIPHATIC FREE-RADICALS; CARBON BOND FORMATION; AQUEOUS-SOLUTION; PULSE-RADIOLYSIS; COBALT(II) MACROCYCLES; ALKYLPEROXY RADICALS; ALPHA-HYDROXYALKYL; MOLECULAR-OXYGEN AB The title reaction produces vanadium(III) ions and the corresponding hydrocarbons. The kinetics were studied by laser flash photolysis with the use of the paraquat radical ion as a kinetic probe. Results are reported for 11 radicals, consisting of primary alkyl radicals (substituted and unsubstituted) and secondary and aralkyl radicals. The rate constants are remarkably insensitive to the nature of the radical, lying in the range (1-6) x 10(5) L mol-1 s-1. The solvent kinetic isotope effects comparing V(H2O6(2+) in H2O with V(D2O)6(2+) in D2O was determined for .CH3,k(H)/k(D) = 3.0. Of several mechanisms considered, we prefer one in which the radical attacks at a trigonal face of V(H2O)6(2+). This leads to electron transfer and a transient (H2O)6VR2+ intermediates, the protonolysis of which yields the observed alkane. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP ESPENSON, JH (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 38 TC 10 Z9 10 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 DEC 11 PY 1991 VL 30 IS 25 BP 4830 EP 4833 DI 10.1021/ic00025a028 PG 4 WC Chemistry, Inorganic & Nuclear SC Chemistry GA GT938 UT WOS:A1991GT93800028 ER PT J AU DOSANJH, MK GALEROS, G GOODMAN, MF SINGER, B AF DOSANJH, MK GALEROS, G GOODMAN, MF SINGER, B TI KINETICS OF EXTENSION OF O6-METHYLGUANINE PAIRED WITH CYTOSINE OR THYMINE IN DEFINED OLIGONUCLEOTIDE SEQUENCES SO BIOCHEMISTRY LA English DT Article ID DNA-POLYMERASE-I; ESCHERICHIA-COLI; INSERTION FIDELITY; KLENOW FRAGMENT; UNIQUE SITE; BASE-PAIRS; O-6-METHYLGUANINE; ALPHA; MUTAGENESIS; DUPLEX AB The frequency of extending m6G.C or m6G.T pairs, when the 3' and 5' flanking neighbors of m6G are either cytosines or thymines, was investigated using primed 25-base-long oligonucleotides and the Klenow fragment of Escherichia coli DNA polymerase I (Kf). The efficiency, V(max)/K(m), of extension to the following normal base pair was up to 40-fold greater than for the formation of the m6G.T or m6G.C pair. The frequencies of inserting either dCMP or dTMP opposite these M6G bases did not appear to be different in the two sequences, C-m6G-C and T-m6G-T, but extension was favored in the C-m6G-C sequence. The m6G.T pair extended to a C.G pair most efficiently, indicating that it was not a strong block to continued replication past the template lesion. Thus, m6G.T flanked by cytosines replicates more readily than when flanked by thymines, increasing G --> A transitions. These data lend further support to the importance of sequence context in mutagenesis. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,DONNER LAB,BERKELEY,CA 94720. UNIV SO CALIF,DEPT BIOL SCI,MOLEC BIOL SECT,LOS ANGELES,CA 90089. RP SINGER, B (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,DONNER LAB,BERKELEY,CA 94720, USA. FU NCI NIH HHS [CA 42736]; NIGMS NIH HHS [GM 42554, GM 21422] NR 24 TC 63 Z9 64 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD DEC 10 PY 1991 VL 30 IS 49 BP 11595 EP 11599 DI 10.1021/bi00113a015 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA GU844 UT WOS:A1991GU84400015 PM 1747377 ER PT J AU LYKKEN, JD SONNENSCHEIN, J WEISS, N AF LYKKEN, JD SONNENSCHEIN, J WEISS, N TI THE THEORY OF ANYONIC SUPERCONDUCTIVITY - A REVIEW SO INTERNATIONAL JOURNAL OF MODERN PHYSICS A LA English DT Review RP LYKKEN, JD (reprint author), FERMI NATL ACCELERATOR LAB,THEORY GRP,MS106,POB 500,BATAVIA,IL 60510, USA. NR 0 TC 42 Z9 42 U1 0 U2 2 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 DEC 10 PY 1991 VL 6 IS 29 BP 5155 EP 5214 DI 10.1142/S0217751X91002434 PG 60 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA GP189 UT WOS:A1991GP18900001 ER PT J AU ZHOU, CL YE, SY KIM, JH COTTON, TM YU, XJ LU, TH DONG, SJ AF ZHOU, CL YE, SY KIM, JH COTTON, TM YU, XJ LU, TH DONG, SJ TI REEVALUATION OF 2,2-BIPYRIDINE AND PYRAZINE AS PROMOTERS FOR DIRECT ELECTRON-TRANSFER BETWEEN CYTOCHROME-C AND METAL-ELECTRODES SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID ENHANCED RAMAN-SCATTERING; MODIFIED GOLD ELECTRODES; DIRECT ELECTROCHEMISTRY; COMPETITIVE ADSORPTION; VOLTAMMETRIC RESPONSE; GRAPHITE-ELECTRODES; SILVER ELECTRODE; REDUCTION; PROTEINS; 2,2'-BIPYRIDINE AB Results from previous electrochemical studies have indicated that 2,2'-bipyridine and pyrazine do not function as promoters for heterogeneous electron transfer between cytochrome c and metal electrodes. Their lack of activity was attributed to the improper positioning of the two functional groups in 2,2'-bipyridine and the inefficient length of pyrazine. In the present study it was determined that both 2,2'-bipyridine and pyrazine act as promoters when self-absorbed over a sufficiently long dipping time or at roughened electrodes. The promoter characteristics of these two molecules were studied and compared with those of 4,4'-bipyridine. The difference in their promoter behavior appears to result primarily from their different strengths of adsorption and not because electrodes modified with 2,2'-bipyridine or pyrazine are unsuitable for accelerating direct electron transfer reactions in cytochrome c. These results have implications regarding the mechanism(s) of promoter effects in electrochemical reactions of cytochrome c. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. ACAD SINICA,CHANGCHUN INST APPL CHEM,ELECTROANALYT CHEM LAB,CHANGCHUN 130022,PEOPLES R CHINA. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 34 TC 21 Z9 29 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 DEC 10 PY 1991 VL 319 IS 1-2 BP 71 EP 83 DI 10.1016/0022-0728(91)87068-F PG 13 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA HJ074 UT WOS:A1991HJ07400005 ER PT J AU ROBERTS, PM AKI, K FEHLER, MC AF ROBERTS, PM AKI, K FEHLER, MC TI A LOW-VELOCITY ZONE IN THE BASEMENT BENEATH THE VALLES CALDERA, NEW-MEXICO SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID MOUNTAINS VOLCANIC FIELD; JEMEZ MOUNTAINS; LONG-VALLEY; CONSTRAINTS; CALIFORNIA; EVOLUTION; MELT; TUFF AB We present quantitative results of forward modeling applied to a suite of travel time delays observed for teleseismic P wave first arrivals recorded in the Valles Caldera, New Mexico, in 1987. We used a ray tracing method to construct a two-dimensional model of the caldera's subsurface P wave velocity structure for the vertical cross section defined by the linear seismometer array geometry used to collect the data. Our initial trial models were based on observations of a systematic pattern in the recorded P wave delays, which indicated that an isolated, low-velocity zone (LVZ) exists in the Precambrian basement beneath the caldera's surface layers. Thus the primary goal of the forward modeling was to determine the size, shape, location, and velocity contrast of the LVZ. Due to incomplete ray coverage we could not uniquely constrain all parameters defining the LVZ, and our final model thus represents a first look at the caldera's midcrustal structure. We placed upper and lower bounds on most model parameters by investigating the ranges of models that fit the data well. We determined that the LVZ must be lens shaped, pinching out laterally on each side, and is located beneath the center of the caldera's resurgent dome. Its width is approximately 17 km from tip to tip, and the depth from the surface to its center is 10-13 km. We could not determine an upper bound for the LVZ's thickness, but we found it could be no smaller than 8 km from top to bottom. For this thickness, the P wave velocity was constrained to lie between 3.5 and 4.2 km/s. Compared with a homogeneous half-space model, the best LVZ model reduced the rms of the residual delays for 21 events by 70%, equivalent to a 91% decrease in the residual variance. The low P wave velocity suggests that the LVZ could be a region of partial melt, possibly related to the Bandelier ignimbrite or postcaldera rhyolite eruptions. C1 UNIV SO CALIF,DEPT GEOL SCI,LOS ANGELES,CA 90089. RP ROBERTS, PM (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV EARTH & ENVIRONM SCI,GEOENGN GRP,EES-4,MAIL STOP D443,LOS ALAMOS,NM 87545, USA. NR 30 TC 13 Z9 13 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD DEC 10 PY 1991 VL 96 IS B13 BP 21583 EP 21596 DI 10.1029/91JB02048 PG 14 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA GW578 UT WOS:A1991GW57800010 ER PT J AU VALENTINE, GA WOHLETZ, KH KIEFFER, SW AF VALENTINE, GA WOHLETZ, KH KIEFFER, SW TI SOURCES OF UNSTEADY COLUMN DYNAMICS IN PYROCLASTIC FLOW ERUPTIONS SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID MOUNT ST-HELENS; NUMERICAL-MODELS AB During the first several minutes of an explosive volcanic eruption, the flow in the column above the vent is unsteady even if the discharge from the vent is steady. At a fixed location in the column, parameters such as temperature and ash content change with time until steady flow conditions are established. For conditions believed to be typical of fountain-forming silicic eruptions of intermediate volume, numerical simulations show unsteadiness in temperature, plume diameter, mass flux, vertical velocity, and particle concentration. In addition to the steady mass flux from the vent, we have identified three sources of mass and heat flux into the column: (1) recirculation of pyroclastic flow material into the base of the column (low elevation inward flow); (2) ash entrained from the top of the pyroclastic flow by atmospheric inflow back toward the column (higher-elevation inward flow); and (3) waves reflected within the pyroclastic flow if it encounteres topographic obstacles. The thermal and mass flux pulses cause variations in column diameter and fountain height. Changing column diameter would be expected to be manifested in changes in fallout deposits (e.g., by shifts in clast isopleths). These temporal variations (if observed, for example, by satellite measurements of temperature pulses or pulses or inferred from field observations of deposit stratigraphy) could be misinterpreted as indicating source variations such as source mass flux, volatile content, or vent diameter, when, in fact, they result from fluid mechanical processes. C1 ARIZONA STATE UNIV,DEPT GEOL,TEMPE,AZ 85287. RP VALENTINE, GA (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV EARTH & ENVIRONM SCI,GEOANAL GRP,MAIL STOP F665,LOS ALAMOS,NM 87545, USA. NR 18 TC 24 Z9 24 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD DEC 10 PY 1991 VL 96 IS B13 BP 21887 EP 21892 DI 10.1029/91JB02151 PG 6 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA GW578 UT WOS:A1991GW57800029 ER PT J AU THOMPSON, ME BROWN, SR AF THOMPSON, ME BROWN, SR TI THE EFFECT OF ANISOTROPIC SURFACE-ROUGHNESS ON FLOW AND TRANSPORT IN FRACTURES SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID SINGLE FRACTURE; ROCK JOINTS; CONTAMINANT TRANSPORT; SOLUTE TRANSPORT; CHANNEL MODEL; POROUS-MEDIA; FLUID-FLOW; DISPERSION; DIFFUSION AB The topography of natural fracture surfaces has a strong influence on the flow and transport properties of fractures. In this paper we investigate the role of anisotropic surface roughness on fluid flow, solute transport, and electrical current flow in fractures. Our results show that the directional characteristics of the surfaces are more important in determining fracture transport properties than is the degree of roughness. Roughness oriented parallel to the primary flow direction substantially enhances fluid and solute transport rates through fractures, with the effect becoming more apparent as the amount of contact area between the surface increases. Roughness oriented transverse to the flow direction inhibits flow rates and delays the movement of solute through the fracture. C1 SANDIA NATL LABS,DEPT EARTH & ENVIRONM DYNAM,ALBUQUERQUE,NM 87185. NR 34 TC 73 Z9 73 U1 1 U2 8 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD DEC 10 PY 1991 VL 96 IS B13 BP 21923 EP 21932 DI 10.1029/91JB02252 PG 10 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA GW578 UT WOS:A1991GW57800032 ER PT J AU NILSON, RH PETERSON, EW LIE, KH BURKHARD, NR HEARST, JR AF NILSON, RH PETERSON, EW LIE, KH BURKHARD, NR HEARST, JR TI ATOMOSPHERIC PUMPING - A MECHANISM CAUSING VERTICAL TRANSPORT OF CONTAMINATED GASES THROUGH FRACTURED PERMEABLE MEDIA SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID DOUBLE-POROSITY; DIFFUSION; WELLS; FLOW AB As the barometer falls, gases are drawn upward out of the permeable Earth into the atmosphere. Conversely, a rising barometer pushes air downward. In a homogeneous permeable medium, these cyclical gas motions are piston-like and nearly reversible, so they contribute only modestly to the net transport of contaminant gases. In a fractured permeable medium, however, the fractures will generally serve as breathing passages for all of the gas-filled porosity, greatly increasing the amplitude and nonuniformity of vertical motions. The resulting transport process may be orders of magnitude more significant than molecular diffusion, according to the theoretical analysis presented here. Analytical solutions are first derived for the sinusoidal pressure response of a medium containing identical vertical fractures equally spaced by slabs of permeable matrix material. These solutions are then used to constrain the relationship between fracture aperture and fracture spacing, based on field comparisons between surface and subsurface pressure variations. The final phase of the analysis addresses the diffusive and advective transport of an inert trace gas which is carried by an oscillatory flow along a fracture having permeable walls. A maximum rate of transport is predicted to occur for an intermediate fracture spacing which is typically a few meters. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP NILSON, RH (reprint author), MAXWELL LABS INC,S CUBED,POB 1620,LA JOLLA,CA 92038, USA. NR 17 TC 71 Z9 73 U1 1 U2 8 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD DEC 10 PY 1991 VL 96 IS B13 BP 21933 EP 21948 DI 10.1029/91JB01836 PG 16 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA GW578 UT WOS:A1991GW57800033 ER PT J AU VARACALLE, DJ HERMAN, H BANCKE, GA BURCHELL, TD ROMANOSKI, GR AF VARACALLE, DJ HERMAN, H BANCKE, GA BURCHELL, TD ROMANOSKI, GR TI VACUUM-PLASMA-SPRAYED SILICON COATINGS SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA SP AMER VACUUM SOC, DIV VACUUM TECHNOL, AMER VACUUM SOC, DIV THIN FILMS AB Vacuum plasma spraying produces well-bonded dense stress-free coatings for a variety of materials on a wide range of substrates. The process is used in many industries for the excellent wear, corrosion resistance and high temperature behavior of the fabricated coatings. In this study, silicon metal was deposited on graphite to study the feasibility of preventing corrosion and oxidation of graphite components for nuclear reactors. Operating parameters were varied in a Taguchi design of experiments to display the range of the plasma processing conditions and their effect on the measured coating characteristics. The coating attributes evaluated were thickness, porosity, microhardness and phase content. This paper discusses the influence of the processing parameters on as-sprayed coating qualities. The paper also discusses the effect of thermal cycling on silicon samples in an inert helium atmosphere. The diffraction spectrum for a sample that experienced a 1600-degrees-C temperature cycle indicated that more than 99% of the coating transformed to beta-SiC. The silicon coatings protected the graphite substrates from oxidation in one experiment. C1 SUNY STONY BROOK,DEPT MAT SCI,STONY BROOK,NY 11794. MARTIN MARIETTA ENERGY SYST INC,OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP VARACALLE, DJ (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. RI Romanoski, Glenn/E-5703-2017; Burchell, Tim/E-6566-2017 OI Romanoski, Glenn/0000-0002-6874-5071; Burchell, Tim/0000-0003-1436-1192 NR 6 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD DEC 10 PY 1991 VL 49 IS 1-3 BP 24 EP 30 DI 10.1016/0257-8972(91)90026-S PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA GX591 UT WOS:A1991GX59100006 ER PT J AU HSIEH, JH LEE, R ERCK, RA FENSKE, GR SU, YY MAREK, M HOCHMAN, RF AF HSIEH, JH LEE, R ERCK, RA FENSKE, GR SU, YY MAREK, M HOCHMAN, RF TI NIOBIUM COATINGS ON 316L STAINLESS-STEEL FOR IMPROVING CORROSION-RESISTANCE SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA SP AMER VACUUM SOC, DIV VACUUM TECHNOL, AMER VACUUM SOC, DIV THIN FILMS ID ION-ASSISTED DEPOSITION AB Niobium coatings were deposited onto 316L stainless steel substrates by ion-beam-assisted deposition. The coatings, deposited under 250 eV ion bombardment with [Ar+]/[Nb] ratios ranging from 0.68 to 0.8, were dense and showed no sign of pitting corrosion in a 3% NaCl solution. Also, based on the result of scratch tests, niobium coatings may act as sacrificial anodes and protect substrates. C1 GEORGIA INST TECHNOL,SCH MAT ENGN,ATLANTA,GA 30332. RP HSIEH, JH (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. NR 11 TC 9 Z9 10 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD DEC 10 PY 1991 VL 49 IS 1-3 BP 83 EP 86 DI 10.1016/0257-8972(91)90036-V PG 4 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA GX591 UT WOS:A1991GX59100016 ER PT J AU KIM, C QADRI, SB TRITT, TM EHRLICH, AC HUES, SM JACOBSEN, RL KUMAR, S GRIMSDITCH, M AF KIM, C QADRI, SB TRITT, TM EHRLICH, AC HUES, SM JACOBSEN, RL KUMAR, S GRIMSDITCH, M TI STRUCTURAL, ELASTIC AND TRANSPORT-PROPERTIES OF AG/AL MULTILAYER THIN-FILMS PREPARED BY ION-BEAM SPUTTERING SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA SP AMER VACUUM SOC, DIV VACUUM TECHNOL, AMER VACUUM SOC, DIV THIN FILMS ID SURFACE ACOUSTIC-WAVES; METALLIC SUPERLATTICES; MECHANICAL-PROPERTIES; FOILS; PALLADIUM; MODULUS; NICKEL AB Multilayers of Ag/Al with composition modulation wavelengths lambda between 13.5 and 210 angstrom were deposited onto silicon substrates using ion-beam sputtering. X-ray diffraction scans showed well defined small angle peaks and satellite peaks at high angles indicating coherent multilayers. The average lattice parameter showed a 1.1% reduction with decreasing modulation wavelengths from 90 to 25 angstrom. Brillouin-scattering measurements showed a moderate 5% enhancement of surface velocity (elastic constant) with decreasing wavelengths. This elastic hardening and interplanar structural contraction may be partially attributed to the observed formation of Ag2Al at the multilayer interfaces. Although deposited only 10 from a normal incidence, the electrical resistivities, measured between 77 and 300 K in a van der Pauw configuration, showed a temperature independent in-plane anisotropy of up to 90% and the room temperature resistivity was an order of magnitude greater than expected from the bulk average. The temperature coefficient of resistivity showed a "U" shaped dependence with lambda and the lower up turn occurred at lambda almost-equal-to 50 angstrom. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP KIM, C (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 32 TC 8 Z9 8 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD DEC 10 PY 1991 VL 49 IS 1-3 BP 143 EP 149 DI 10.1016/0257-8972(91)90046-Y PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA GX591 UT WOS:A1991GX59100026 ER PT J AU MCKERNAN, MA AF MCKERNAN, MA TI MAGNETRON SPUTTER DEPOSITION OF BORON AND BORON-CARBIDE SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA SP AMER VACUUM SOC, DIV VACUUM TECHNOL, AMER VACUUM SOC, DIV THIN FILMS AB The fabrication of X-ray optical coatings with greater reflectivity required the development of sputter deposition processes for boron and boron carbide. The use of high density boron and boron carbide (B4C) and a vacuum-brazed target design was required to achieve the required sputter process stability and resistance to the thermal stress created by high rate sputtering. Our results include a description of the target fabrication procedures and sputter process parameters necessary to fabricate B4C and boron modulated thin film structures. RP MCKERNAN, MA (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 808,L-369,LIVERMORE,CA 94550, USA. NR 2 TC 33 Z9 33 U1 0 U2 8 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD DEC 10 PY 1991 VL 49 IS 1-3 BP 411 EP 415 DI 10.1016/0257-8972(91)90092-B PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA GX591 UT WOS:A1991GX59100072 ER PT J AU ERDEMIR, A ERCK, RA ROBLES, J AF ERDEMIR, A ERCK, RA ROBLES, J TI RELATIONSHIP OF HERTZIAN CONTACT PRESSURE TO FRICTION BEHAVIOR OF SELF-LUBRICATING BORIC-ACID FILMS SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA SP AMER VACUUM SOC, DIV VACUUM TECHNOL, AMER VACUUM SOC, DIV THIN FILMS AB The effect of hertzian contact pressure on the friction coefficient of self-lubricating boric acid (H3BO3) films was investigated by sliding steel and ceramic balls against boric oxide (B2O3) coated steel and ceramic disks under a wide range of contact loads. Self-lubricating H3BO3 films result from a spontaneous chemical reaction between water molecules and B2O3 coatings in humid air. Mean initial hertzian contact pressures in the range 0.31-1.6 GPa were created between balls and B2O3-coated disks by varying the applied load and the radius of the balls. It was demonstrated that an inverse relationship exists between friction coefficient and hertzian contact pressure. Using the hertzian contact model, we estimated that the shear strength of H3BO3 films was approximately 22.9 MPa, which is comparable with 24.8 MPa reported for MoS2. C1 UNIV CALIF DAVIS,DEPT MECH ENGN,DAVIS,CA 95616. RP ERDEMIR, A (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. NR 9 TC 35 Z9 35 U1 4 U2 6 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD DEC 10 PY 1991 VL 49 IS 1-3 BP 435 EP 438 DI 10.1016/0257-8972(91)90096-F PG 4 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA GX591 UT WOS:A1991GX59100076 ER PT J AU BUCKLEY, P PLACZANKIS, B LOWDER, L BROWN, IG BROWN, R AF BUCKLEY, P PLACZANKIS, B LOWDER, L BROWN, IG BROWN, R TI NOBLE-METAL IMPLANTATION TO REDUCE HYDROGEN EMBRITTLEMENT IN STEELS SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA SP AMER VACUUM SOC, DIV VACUUM TECHNOL, AMER VACUUM SOC, DIV THIN FILMS AB The effect of ion implantation on the resistance to hydrogen embrittlement of a high-strength low-alloy steel was investigated. The steel was a 4340 electro-slag remelted steel heat treated to a hardness of Rc 52. Platinum and palladium implantation was carried out on flat corrosion samples, notched round bar and precracked Charpy mechanical test samples. Implantation of the steel raised its corrosion potential in the noble direction but did not passivate the surface. The implantation also increased failure loads for notched samples. However, the effect of ion implantation on the hydrogen embrittlement resistance of precracked samples was minimal owing to the inability of the ion implantation flux to penetrate into the crack. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ACCELERATOR & FUS RES,BERKELEY,CA 94720. UNIV RHODE ISL,DEPT CHEM ENGN,KINGSTON,RI 02881. RP BUCKLEY, P (reprint author), MAT TECHNOL LAB,MET RES BRANCH,WATERTOWN,MA 02172, USA. NR 9 TC 6 Z9 6 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD DEC 10 PY 1991 VL 49 IS 1-3 BP 500 EP 503 DI 10.1016/0257-8972(91)90107-8 PG 4 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA GX591 UT WOS:A1991GX59100087 ER PT J AU RICCO, AJ MARTIN, SJ AF RICCO, AJ MARTIN, SJ TI THIN METAL-FILM CHARACTERIZATION AND CHEMICAL SENSORS - MONITORING ELECTRONIC CONDUCTIVITY, MASS LOADING AND MECHANICAL-PROPERTIES WITH SURFACE ACOUSTIC-WAVE DEVICES SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA ID OXYGEN AB Acoustoelectric coupling between charge carriers in a thin metal film and the evanescent electric field associated with a surface acoustic wave (SAW) propagating along the surface of a piezoelectric substrate provides a unique interaction mechanism with which to study the film's electronic charge transport properties, as well as changes in these properties resulting from chemisorption from the gas phase. We utilized 97 MHz ST-cut quartz- and 32 MHz Y-cut LiNbO3-based SAW devices to follow ( 1) the process of vacuum deposition of thin metal films (5-500 angstrom), (2) the (room temperature) relaxation of such films after their deposition, and (3) the chemisorption-induced changes in both the mass density and electrical conductivity of such films. Changes in mass density were followed with a resolution exceeding ]% of a monolayer. Sheet conductivity measurements made with the 97 MHz SAW device correlated well with simultaneous measurements made with a d.c. electrometer. In addition, changes in the mechanical properties of freshly deposited thin films were observed during relaxation and when gaseous species interact with them; we believe this is a result of adsorption predominantly along grain boundaries. The combination of responses to three different physical parameters can be utilized in the design of chemical sensors. RP RICCO, AJ (reprint author), SANDIA NATL LABS,DIV MICROSENSOR 1315,ALBUQUERQUE,NM 87185, USA. RI Ricco, Antonio/A-5273-2010; OI Ricco, Antonio/0000-0002-2355-4984 NR 35 TC 50 Z9 51 U1 1 U2 10 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 DEC 10 PY 1991 VL 206 IS 1-2 BP 94 EP 101 DI 10.1016/0040-6090(91)90399-I PG 8 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA GZ322 UT WOS:A1991GZ32200016 ER PT J AU JELLISON, GE AF JELLISON, GE TI 2-CHANNEL SPECTROSCOPIC POLARIZATION MODULATION ELLIPSOMETRY - A NEW TECHNIQUE FOR THE ANALYSIS OF THIN SIO2-FILMS SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA ID THERMALLY GROWN OXIDE; INTERFACE; SILICON; DENSITY AB A new spectroscopic ellipsometer is described, where the incoming light is dynamically polarized using a photoelastic modulator. and the reflected light is separated into orthogonally polarized beams using a Wollaston prism. Both beams are detected using photomultiplier tubes whose bias voltage is dynamically controlled for constant d.c. All three of the associated ellipsometry parameters (N = cos 2-psi, S = sin 2-psi sin-DELTA, C = sin 2-psi cos-DELTA) can be determined simultaneously in a single scan (240-840 nm or 5.16 1.47 eV). This instrument was used to study the optical properties of thin SiO2 films from 3 to 325 nm in thickness. Using a biased estimator fitting technique. the raw ellipsometric data can be fitted to an air-SiO2-interface-Si model, where the optical functions of the SiO2 layer and the interface region are approximated using one-term Sellmeier approximation, and a 50% void, 50% SiO2 Bruggeman effective medium approximation respectively. The refractive index of the SiO2 layer is dependent on film thickness, increasing with decreasing film thickness, but always being greater than that of fused quartz. The thickness of the interfacial region increases with increasing film thickness, being less than 0.2 nm for film thicknesses less than 20 nm. RP JELLISON, GE (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 20 TC 5 Z9 5 U1 0 U2 6 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 DEC 10 PY 1991 VL 206 IS 1-2 BP 294 EP 299 DI 10.1016/0040-6090(91)90438-4 PG 6 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA GZ322 UT WOS:A1991GZ32200055 ER PT J AU ALFORD, C SERDUKE, F MAKOWIECKI, D JANKOWSKI, A WALL, M AF ALFORD, C SERDUKE, F MAKOWIECKI, D JANKOWSKI, A WALL, M TI X-RAY FIDUCIAL FOILS SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA AB The transmission of X-rays through a thin foil containing aluminum, silicon and yttrium produce an in situ calibration of their photon energies. The position of the absorption edges of the aluminum, silicon and yttrium was used to calibrate the X-ray energy spectrum recorded on photographic film. The foil consisted of 4000 angstrom of aluminum, 6000 angstrom of silicon and 4000 angstrom of yttrium sputter deposited on a 1.5-mu-m thick Mylar(R) film. It was necessary to layer the structure in order to achieve the required mechanical strength and dimensional stability. Our results include analysis of the X-ray energy spectrum and microstructural characterization of the foil using X-ray diffraction and transmission electron microscopy. RP ALFORD, C (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 808,L-369,LIVERMORE,CA 94550, USA. NR 5 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD DEC 10 PY 1991 VL 206 IS 1-2 BP 306 EP 311 DI 10.1016/0040-6090(91)90440-9 PG 6 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA GZ322 UT WOS:A1991GZ32200057 ER PT J AU JANKOWSKI, AF PERRY, PL AF JANKOWSKI, AF PERRY, PL TI CHARACTERIZATION OF MO/B4C MULTILAYERS SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA ID W/B4C MULTILAYERS; W/C AB The Mo/B4C multilayer system is selected for maximum, normal incidence reflection of 6.7 nm X-rays. Application in projection lithography requires structural optimization for smooth layering and minimal interface roughness. A transmission electron microscopy analysis of samples prepared in cross-section reveals an intrinsic layer roughness despite attempts to refine sputter deposition parameters. The limitations in growth morphology are attributable to interfacial reactivity from inherent phase instability. RP JANKOWSKI, AF (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 11 TC 25 Z9 28 U1 0 U2 2 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 DEC 10 PY 1991 VL 206 IS 1-2 BP 365 EP 368 DI 10.1016/0040-6090(91)90452-4 PG 4 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA GZ322 UT WOS:A1991GZ32200069 ER PT J AU BREWER, LR AF BREWER, LR TI SUPPRESSION OF BEAM STEERING IN AN INJECTION-LOCKED LASER DIODE-ARRAY SO APPLIED PHYSICS LETTERS LA English DT Article ID LOCKING AB Experimental measurements were made to demonstrate that the degree of beam steering in an injection-locked laser diode array is related to the divergence of the master laser beam. For a collimated master laser beam the beam steering was suppressed. The injection-locked laser diode array beam steers with the master laser wavelength because only a portion of the divergent master laser beam satisfies the round trip mode condition. RP BREWER, LR (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Brewer, Laurence/G-4056-2012 NR 8 TC 0 Z9 0 U1 1 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 DEC 9 PY 1991 VL 59 IS 24 BP 3078 EP 3080 DI 10.1063/1.105794 PG 3 WC Physics, Applied SC Physics GA GT899 UT WOS:A1991GT89900002 ER PT J AU SHI, DL SALEMSUGUI, S WANG, ZN GOODRICH, LF DOU, SX LIU, HK GUO, YC SORRELL, CC AF SHI, DL SALEMSUGUI, S WANG, ZN GOODRICH, LF DOU, SX LIU, HK GUO, YC SORRELL, CC TI CRITICAL CURRENTS IN SILVER-SHEATHED (BI,PB)2SR2CA2CU3O10-Y SUPERCONDUCTING TAPES SO APPLIED PHYSICS LETTERS LA English DT Article ID CRITICAL CURRENT-DENSITY; WIRES; YBA2CU3O7-X AB Nearly 95 vol % of the 110 K superconducting phase was formed by lead doping in a Bi-Sr-Ca-Cu-O system. The processed 110 K superconducting powders were used to produce long silver-sheathed tapes with a highly textured microstructure by rolling and prolonged sintering. The transport critical current density was measured at 4.0 K to be 0.7 X 10(5) A/cm2 (the corresponding critical current is 74 A) at zero field and 1.6 X 10(4) A/cm2 at 12 T for H parallel-to ab. At 76 K, the critical current density reached a value of approximately 1 X 10(4) A/cm2 at zero field for H parallel-to ab and gradually decreased to 419 A/cm2 at 1 T. Excellent grain alignment in the a-b plane led to greatly improved critical current densities under a magnetic field. The relationship between the transport properties and the microstructure of the tapes is discussed. C1 NATL INST STANDARDS & TECHNOL,DIV ELECTROMAGNET TECHNOL,BOULDER,CO 80303. UNIV NEW S WALES,SCH MAT SCI & ENGN,KENSINGTON,NSW 2033,AUSTRALIA. RP SHI, DL (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Dou, Shi Xue/D-5179-2012; Liu, Hua/G-1349-2012 OI Dou, Shi Xue/0000-0003-3824-7693; Liu, Hua/0000-0002-0253-647X NR 20 TC 18 Z9 19 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 DEC 9 PY 1991 VL 59 IS 24 BP 3171 EP 3173 DI 10.1063/1.105774 PG 3 WC Physics, Applied SC Physics GA GT899 UT WOS:A1991GT89900034 ER PT J AU MILLER, DJ CHIARELLO, RP KIM, HK ROBERTS, T YOU, H KAMPWIRTH, RT GRAY, KE ZHENG, JQ WILLIAMS, S CHANG, RPH KETTERSON, JB AF MILLER, DJ CHIARELLO, RP KIM, HK ROBERTS, T YOU, H KAMPWIRTH, RT GRAY, KE ZHENG, JQ WILLIAMS, S CHANG, RPH KETTERSON, JB TI PHASE-RELATIONSHIPS IN CU-O THIN-FILMS PREPARED BY SPUTTERING SO APPLIED PHYSICS LETTERS LA English DT Article ID GROWTH; OXYGEN AB The conditions for deposition of Cu and Cu-oxide thin films by reactive dc sputtering have been investigated by characterizing the crystal structure of growing films both during and immediately following deposition using an in situ x-ray diffraction technique. The relationship between sputtering conditions and the phases deposited was established for a variety of conditions. At each temperature studied, increasing the oxygen pressure in the system resulted in a systematic change in the phases deposited. Of significant importance was the identification of temperature-pressure regimes in which CuO was stable during deposition but reverted to Cu2O after the sputtering plasma was extinguished, suggesting a shift in the oxidizing potential in the plasma environment. These results also suggest that the in situ analysis technique may be ideally suited for the investigation of phase relationships and phase diagrams in other systems. C1 NORTHWESTERN UNIV,DEPT PHYS,EVANSTON,IL 60208. NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208. RP MILLER, DJ (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI Ketterson, John/B-7234-2009; Chang, R.P.H/B-7505-2009; You, Hoydoo/A-6201-2011 OI You, Hoydoo/0000-0003-2996-9483 NR 12 TC 12 Z9 12 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD DEC 9 PY 1991 VL 59 IS 24 BP 3174 EP 3176 DI 10.1063/1.105775 PG 3 WC Physics, Applied SC Physics GA GT899 UT WOS:A1991GT89900035 ER PT J AU RAISTRICK, ID HAWLEY, M BEERY, JG GARZON, FH HOULTON, RJ AF RAISTRICK, ID HAWLEY, M BEERY, JG GARZON, FH HOULTON, RJ TI MICROSTRUCTURE AND GROWTH-MECHANISM OF THIN SPUTTERED FILMS OF YBA2CU3O7 ON MGO SUBSTRATES SO APPLIED PHYSICS LETTERS LA English DT Article AB The microstructures of very thin sputtered films of YBa2Cu3O7 deposited on (100) faces of single-crystal MgO, have been investigated using scanning tunneling and atomic force microscopies. By a thickness of 10 nm, the substrate is completely covered by a fine-grained layer of the superconductor. The average grain size is about 100 nm. Many of these grains show evidence of a spiral growth mechanism. In somewhat thicker films (20 nm), the grain size has increased considerably (to about 200 nm), and this trend continues as the thickness is increased. The small grain size close to the interface suggests a possible origin for widely observed ion-beam dechanneling in this region of the film. RP RAISTRICK, ID (reprint author), UNIV CALIF LOS ALAMOS SCI LAB, LOS ALAMOS, NM 87545 USA. NR 6 TC 49 Z9 49 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0003-6951 EI 1077-3118 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD DEC 9 PY 1991 VL 59 IS 24 BP 3177 EP 3179 DI 10.1063/1.105776 PG 3 WC Physics, Applied SC Physics GA GT899 UT WOS:A1991GT89900036 ER PT J AU JONES, EC CHRISTEN, DK KLABUNDE, CE THOMPSON, JR NORTON, DP FEENSTRA, R LOWNDES, DH BUDAI, JD AF JONES, EC CHRISTEN, DK KLABUNDE, CE THOMPSON, JR NORTON, DP FEENSTRA, R LOWNDES, DH BUDAI, JD TI FLUX CREEP IN THE JOSEPHSON MIXED STATE OF GRANULAR-ORIENTED YBA2CU3O7-X THIN-FILMS SO APPLIED PHYSICS LETTERS LA English DT Article ID SUPERCONDUCTORS; ZIRCONIA AB A self-consistent critical current model in the Josephson mixed state is proposed for a series of c-oriented, polycrystalline and for a series of epitaxial triaxially oriented YBCO thin films. The flux pinning activation energies were experimentally determined from electrical transport measurements over a wide range of temperatures and were found to behave quite differently for the two types of granular film. With these activation energies applied to a superconductor-normal metal-superconductor weak-link system, thermally activated flux motion is shown to reproduce the experimentally measured critical current densities. C1 OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. RP JONES, EC (reprint author), UNIV TENNESSEE, DEPT PHYS, KNOXVILLE, TN 37996 USA. RI Budai, John/R-9276-2016 OI Budai, John/0000-0002-7444-1306 NR 16 TC 14 Z9 14 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0003-6951 EI 1077-3118 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD DEC 9 PY 1991 VL 59 IS 24 BP 3183 EP 3185 DI 10.1063/1.105754 PG 3 WC Physics, Applied SC Physics GA GT899 UT WOS:A1991GT89900038 ER PT J AU PRICE, DL SABOUNGI, ML SUSMAN, S VOLIN, KJ WRIGHT, AC AF PRICE, DL SABOUNGI, ML SUSMAN, S VOLIN, KJ WRIGHT, AC TI NEUTRON-SCATTERING FUNCTION OF VITREOUS AND MOLTEN ZINC-CHLORIDE SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID CHALCOGENIDE GLASSES; VIBRATIONAL-SPECTRA; NETWORK DYNAMICS; DISELENIDE; SILICA; LIQUID; RAMAN AB The dynamics of vitreous and molten zinc chloride have been studied with inelastic neutron scattering at the Intense Pulsed Neutron Source at Argonne National Laboratory. The results are analyzed in terms of the scattering function S(Q, E) and the effective vibrational density of states G(E). The vibrational spectra of both glass and liquid are dominated by broad features centred at 15 and 35 meV which are identified with the F2 modes of ZnCl4(2-) tetrahedra. The other two normal modes are not observed because of inadequate resolution and because of broadening and overlap resulting from coupling between tetrahedra. The energy widths of the scattering are lower than those predicted for independent particles over the entire Q range of the measurement, indicating strong binding of the ions to the network structure in both the glass and liquid. C1 UNIV READING,JJ THOMSON PHYS LAB,READING RG6 2AH,BERKS,ENGLAND. RP PRICE, DL (reprint author), ARGONNE NATL LAB,COLL MAT SCI,ARGONNE,IL 60439, USA. RI Price, David Long/A-8468-2013; Saboungi, Marie-Louise/C-5920-2013 OI Saboungi, Marie-Louise/0000-0002-0607-4815 NR 24 TC 16 Z9 16 U1 0 U2 2 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 DEC 9 PY 1991 VL 3 IS 49 BP 9835 EP 9842 DI 10.1088/0953-8984/3/49/001 PG 8 WC Physics, Condensed Matter SC Physics GA GV479 UT WOS:A1991GV47900001 ER PT J AU ADOLF, D MARTIN, JE AF ADOLF, D MARTIN, JE TI ULTRASLOW RELAXATIONS IN NETWORKS - EVIDENCE FOR REMNANT FRACTAL STRUCTURES SO MACROMOLECULES LA English DT Article ID SOL-GEL TRANSITION; VISCOELASTIC PROPERTIES AB An intriguing relationship has been found between the relaxation time spectra of a network at the gel point-the incipient gel-and in the fully cured state. Measurements of the dynamic shear moduli of several epoxy and siloxane networks, with equilibrium moduli varying by 4 orders of magnitude, show G" approximately omega-OMEGA at all extents of reaction past the gel point, where the viscoelastic exponent OMEGA remains at the incipient gel value of 0.5-0.8. This surprising correspondence suggests that chemical networks possess some remnant of the fractal structure of the incipient gel, so the implications of this are discussed. These viscoelastic results are compared to quasielastic light scattering studies on curing silica gels, where the power law decay S(q,t) approximately t-phi of the dynamic structure factor has been observed at and beyond the gel point, with phi unaltered by the extent of reaction. C1 SANDIA NATL LABS,DIV STRUCT PHYS & SHOCK,ALBUQUERQUE,NM 87185. RP ADOLF, D (reprint author), SANDIA NATL LABS,DIV PHYS PROPERTIES POLYMERS,ALBUQUERQUE,NM 87185, USA. NR 20 TC 42 Z9 42 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD DEC 9 PY 1991 VL 24 IS 25 BP 6721 EP 6724 DI 10.1021/ma00025a025 PG 4 WC Polymer Science SC Polymer Science GA GT821 UT WOS:A1991GT82100025 ER PT J AU CURRO, JG SCHWEIZER, KS AF CURRO, JG SCHWEIZER, KS TI INTEGRAL-EQUATION THEORY FOR COMPRESSIBLE POLYMER ALLOYS - THERMODYNAMICS, SCATTERING, AND MISCIBILITY OF GAUSSIAN CHAINS SO MACROMOLECULES LA English DT Article ID LOCAL STRUCTURAL SYMMETRY; LENNARD-JONES MIXTURES; CHI-F PARAMETER; NEUTRON-SCATTERING; MOLECULAR LIQUIDS; MELTS; BLENDS; PRESSURE; SERIES; STATE AB A series of numerical calculations are performed on binary mixtures of Gaussian chains using our recently developed integral equation theory of polymer blends. The intermolecular radial distribution function, structure factor, chi-parameter, spinodal temperature, and compressibility are investigated over a range of molecular parameters. Structurally symmetric (the symmetric isotope blend) and various structurally asymmetric mixtures were studied. We find that the integral equation approach, which includes the effects of concentration fluctuations and nonrandom packing, leads to an increase in miscibility relative to the Flory-Huggins theory. For the symmetric isotope blend the chi-parameter, calculated at fixed temperature and composition, decreases linearly with N-1/2 for large degrees of polymerization N. Our calculations of chi as a function of composition for the symmetric isotopic blend are in good qualitative agreement with recent SANS measurements of Bates and co-workers. The wave vector dependence of the effective chi-parameter is calculated and the implications with regard to block copolymers is discussed. The dependence of chi on temperature, composition, and N is systematically studied. We find that the incompressible random phase approximation (RPA) agrees with fully compressible calculations for the partial structure factors in the case of the symmetric isotope, but progressively deterioriates as structural asymmetry between the components is increased due to compressibility effects. Whereas the RPA predicts a large increase in miscibility as the disparity in segment lengths between the components increases, calculations of the critical temperature which include density fluctuations show only a relatively small enhancement. A striking result from this integral equation theory of polymer blends is that the upper critical solution temperature is proportional to square-root N rather than a linear N dependence predicted by the Flory-Huggins theory. This unexpected molecular weight dependence, which is a consequence of the correlation hole, is found for both structurally symmetric and weakly asymmetric blends. C1 UNIV ILLINOIS,DEPT MAT SCI & ENGN,URBANA,IL 61801. RP CURRO, JG (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 46 TC 50 Z9 50 U1 1 U2 12 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD DEC 9 PY 1991 VL 24 IS 25 BP 6736 EP 6747 DI 10.1021/ma00025a028 PG 12 WC Polymer Science SC Polymer Science GA GT821 UT WOS:A1991GT82100028 ER PT J AU BARPELED, O ISRAELI, M BENHUR, H HOSKINS, I GRONER, Y BIEGON, A AF BARPELED, O ISRAELI, M BENHUR, H HOSKINS, I GRONER, Y BIEGON, A TI DEVELOPMENTAL PATTERN OF MUSCARINIC RECEPTORS IN NORMAL AND DOWNS-SYNDROME FETAL BRAIN - AN AUTORADIOGRAPHIC STUDY SO NEUROSCIENCE LETTERS LA English DT Article DE MUSCARINIC RECEPTOR; HUMAN FETAL BRAIN; DOWNS SYNDROME ID QUINUCLIDINYL BENZILATE BINDING; CHOLINERGIC RECEPTORS; HUMAN-FETUS; SITES; INFANT; ACETYLCHOLINESTERASE; HYPOTHESIS; SUBTYPES; STRIATUM; REGIONS AB The ontogeny of muscarinic cholinergic receptors in developing human brain was analyzed by in vitro receptor autoradiography with [H-3]Quinuclidinyl Benzilate. It was found that muscarinic receptors develop relatively early; the levels at 24 weeks of gestation were comparable or even higher than the values in the adult brain, and that the levels of both M1 and M2 receptors increase with age. M1 receptors were concentrated mainly in forebrain regions while M2 receptors dominated in the thalamus. Scatchard analysis revealed K(d) and B(max) values which are comparable to the adult values. Three brains of aborted Down's syndrome fetuses were examined in parallel and exhibited comparable levels and similar distribution to normal non-Down fetuses except for a modest increase of receptor levels which was observed in the striatum. C1 KAPLAN HOSP,DEPT OBSTET & GYNECOL,IL-76100 REHOVOT,ISRAEL. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV RES MED & RADIAT BIOPHYS,BERKELEY,CA 94720. NYU MED CTR,DEPT OBSTET & GYNECOL,NEW YORK,NY 10016. WEIZMANN INST SCI,DEPT NEUROBIOL,IL-76100 REHOVOT,ISRAEL. RP BARPELED, O (reprint author), WEIZMANN INST SCI,DEPT MOLEC GENET & VIROL,IL-76100 REHOVOT,ISRAEL. FU NICHD NIH HHS [HD21229] NR 26 TC 16 Z9 16 U1 0 U2 0 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0304-3940 J9 NEUROSCI LETT JI Neurosci. Lett. PD DEC 9 PY 1991 VL 133 IS 2 BP 154 EP 158 DI 10.1016/0304-3940(91)90558-B PG 5 WC Neurosciences SC Neurosciences & Neurology GA GX484 UT WOS:A1991GX48400002 PM 1840077 ER PT J AU ABAZOV, AI ANOSOV, OL FAIZOV, EL GAVRIN, VN KALIKHOV, AV KNODEL, TV KNYSHENKO, II KORNOUKHOV, VN MEZENTSEVA, SA MIRMOV, IN OSTRINSKY, AV PSHUKOV, AM REVZIN, NE SHIKHIN, AA TIMOFEYEV, PV VERETENKIN, EP VERMUL, VM ZATSEPIN, GT BOWLES, TJ CLEVELAND, BT ELLIOTT, SR OBRIEN, HA WARK, DL WILKERSON, JF DAVIS, R LANDE, K CHERRY, ML KOUZES, RT AF ABAZOV, AI ANOSOV, OL FAIZOV, EL GAVRIN, VN KALIKHOV, AV KNODEL, TV KNYSHENKO, II KORNOUKHOV, VN MEZENTSEVA, SA MIRMOV, IN OSTRINSKY, AV PSHUKOV, AM REVZIN, NE SHIKHIN, AA TIMOFEYEV, PV VERETENKIN, EP VERMUL, VM ZATSEPIN, GT BOWLES, TJ CLEVELAND, BT ELLIOTT, SR OBRIEN, HA WARK, DL WILKERSON, JF DAVIS, R LANDE, K CHERRY, ML KOUZES, RT TI SEARCH FOR NEUTRINOS FROM THE SUN USING THE REACTION GA-71(NU-E,E-)GE-71 SO PHYSICAL REVIEW LETTERS LA English DT Article ID SOLAR; OSCILLATIONS; MATTER AB A radiochemical Ga-71-Ge-71 experiment using 30 tons of gallium to determine the primary flux of neutrinos from the Sun has begun operation at the Baksan Neutrino Observatory in the U.S.S.R. Assuming that the extraction efficiency for Ge-71 atoms produced by solar neutrinos is the same as from natural Ge carrier, we observed the capture rate to be 20(-20)+15(stat) +/- 32(syst) solar neutrino units (SNU), resulting in a limit of less than 79 SN U (90% C. L.). This is to be compared with 132 SNU predicted by the standard solar model. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. UNIV PENN,PHILADELPHIA,PA 19104. LOUISIANA STATE UNIV,BATON ROUGE,LA 70803. PRINCETON UNIV,PRINCETON,NJ 08544. RP ABAZOV, AI (reprint author), ACAD SCI USSR,INST NUCL RES,MOSCOW 117312,USSR. NR 16 TC 286 Z9 287 U1 0 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD DEC 9 PY 1991 VL 67 IS 24 BP 3332 EP 3335 DI 10.1103/PhysRevLett.67.3332 PG 4 WC Physics, Multidisciplinary SC Physics GA GT900 UT WOS:A1991GT90000003 ER PT J AU JACOBSEN, RG KOETKE, DS ADOLPHSEN, CE FUJINO, D SCHUMM, BA WAGNER, SR ALEXANDER, JP AVERILL, D BARISH, BC BARKLOW, T BARNETT, BA BLOCKUS, D BOYARSKI, A BRABSON, B BREAKSTONE, A BULOS, F BURCHAT, PR BURKE, DL CENCE, RJ CHAPMAN, J CHMEISSANI, M CORDS, D COUPAL, DP DAUNCEY, P DESTAEBLER, HC DORFAN, JM DRELL, PS DREWER, DC DURRETT, D ELIA, R FELDMAN, GJ FIELD, RC FORD, WT FORDHAM, C FREY, R GAN, KK GERO, E GIDAL, G GLANZMAN, T GOLDHABER, G CADENAS, JJG GRATTA, G HANSON, G HARR, R HARRAL, B HARRIS, FA HAYES, K HEARTY, C HEUSCH, CA HILDRETH, MD HIMEL, T HINSHAW, DA HONG, SJ HUTCHINSON, D HYLEN, J INNES, WR JAROS, JA JUNG, CK KADYK, JA KENNEY, C KING, M KOMAMIYA, S KOWALSKI, LA KRAL, JF KUHLEN, M LABARGA, L LANKFORD, AJ LEDIBERDER, F LEVI, ME LITKE, AM LOU, XC LUTH, V MCKENNA, JA MATTHEWS, JAJ MATTISON, T MOFFEIT, KC MUNGER, CT MURRAY, WN NASH, J OGREN, H OSHAUGHNESSY, KF PARKER, SI PECK, C PERL, ML PETRADZA, M PITTHAN, R PORTER, FC RANKIN, P RUST, DR SADROZINSKI, HFW SCHWARZ, AS SEIDEN, A SMITH, JG SNYDER, A SODERSTROM, E STOKER, DP STROYNOWSKI, R SWARTZ, M THUN, R TRILLING, GH TURALA, M VANKOOTEN, R WEBER, P WEINSTEIN, AJ WICKLUND, E WOODS, M YURKO, M ZACCARDELLI, C AF JACOBSEN, RG KOETKE, DS ADOLPHSEN, CE FUJINO, D SCHUMM, BA WAGNER, SR ALEXANDER, JP AVERILL, D BARISH, BC BARKLOW, T BARNETT, BA BLOCKUS, D BOYARSKI, A BRABSON, B BREAKSTONE, A BULOS, F BURCHAT, PR BURKE, DL CENCE, RJ CHAPMAN, J CHMEISSANI, M CORDS, D COUPAL, DP DAUNCEY, P DESTAEBLER, HC DORFAN, JM DRELL, PS DREWER, DC DURRETT, D ELIA, R FELDMAN, GJ FIELD, RC FORD, WT FORDHAM, C FREY, R GAN, KK GERO, E GIDAL, G GLANZMAN, T GOLDHABER, G CADENAS, JJG GRATTA, G HANSON, G HARR, R HARRAL, B HARRIS, FA HAYES, K HEARTY, C HEUSCH, CA HILDRETH, MD HIMEL, T HINSHAW, DA HONG, SJ HUTCHINSON, D HYLEN, J INNES, WR JAROS, JA JUNG, CK KADYK, JA KENNEY, C KING, M KOMAMIYA, S KOWALSKI, LA KRAL, JF KUHLEN, M LABARGA, L LANKFORD, AJ LEDIBERDER, F LEVI, ME LITKE, AM LOU, XC LUTH, V MCKENNA, JA MATTHEWS, JAJ MATTISON, T MOFFEIT, KC MUNGER, CT MURRAY, WN NASH, J OGREN, H OSHAUGHNESSY, KF PARKER, SI PECK, C PERL, ML PETRADZA, M PITTHAN, R PORTER, FC RANKIN, P RUST, DR SADROZINSKI, HFW SCHWARZ, AS SEIDEN, A SMITH, JG SNYDER, A SODERSTROM, E STOKER, DP STROYNOWSKI, R SWARTZ, M THUN, R TRILLING, GH TURALA, M VANKOOTEN, R WEBER, P WEINSTEIN, AJ WICKLUND, E WOODS, M YURKO, M ZACCARDELLI, C TI MEASUREMENT OF THE BBAR FRACTION IN HADRONIC Z0 DECAYS WITH PRECISION VERTEX DETECTORS SO PHYSICAL REVIEW LETTERS LA English DT Article ID MARK-II DETECTOR; LUND MONTE-CARLO; JET FRAGMENTATION; DRIFT CHAMBER; E+E-PHYSICS AB We have measured the fraction of bbBAR events in hadronic Z0 decays, R(bbBAR), using the vertex detector system of the Mark II detector at the SLAC Linear Collider. We tag bbBAR events by requiring the coincidence of three or more tracks with significant impact parameters. This tag is 50% efficient and results in a sample of 85% purity. We find R(bbBAR) = 0.251 +/- 0.049 +/- 0.030, in good agreement with other measurements and the standard model prediction. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. CALTECH,PASADENA,CA 91125. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. UNIV CALIF SANTA CRUZ,SANTA CRUZ,CA 95064. UNIV MICHIGAN,ANN ARBOR,MI 48109. INDIANA UNIV,BLOOMINGTON,IN 47405. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV HAWAII,HONOLULU,HI 96822. UNIV COLORADO,BOULDER,CO 80309. RP JACOBSEN, RG (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. RI Gomez Cadenas, Juan Jose/L-2003-2014; Chmeissani, Mokhtar/G-4346-2015 OI Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Chmeissani, Mokhtar/0000-0002-2287-4791 NR 24 TC 18 Z9 18 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 DEC 9 PY 1991 VL 67 IS 24 BP 3347 EP 3350 DI 10.1103/PhysRevLett.67.3347 PG 4 WC Physics, Multidisciplinary SC Physics GA GT900 UT WOS:A1991GT90000007 ER PT J AU ABE, F AMIDEI, D APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BACCHETTA, N BAILEY, MW BAMBERGER, A BARNETT, BA BARBAROGALTIERI, A BARNES, VE BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BHADRA, S BINKLEY, M BLAIR, R BLOCKER, C BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CURATOLO, M DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DRUCKER, RB ELIAS, JE ELY, R ENO, S ERREDE, S ESPOSITO, B FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y FUNAYAMA, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GOULIANOS, K GRASSMANN, H GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRIS, RM HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, S KIRSCH, L KONDO, K KONIGSBERG, J KOVACS, E KUHLMANN, SE KUNS, E LAASANEN, AT LAMOUREUX, JI LEONE, S LI, W LISS, TM LOCKYER, N LUCHINI, CB LUKENS, P MAAS, P MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A NAKAE, LF NAKANO, I NELSON, C NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PARA, A PARE, E PATRICK, J PHILLIPS, TJ PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SEKIGUCHI, M SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L STDENIS, R STEFANINI, A SULLIVAN, G SWARTZ, RL TAKANO, M TARTARELLI, F TAKIKAWA, K TAREM, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WILLIAMS, HH WINER, BL WYSS, J YAGIL, A YAMASHITA, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZUCCHELLI, S AF ABE, F AMIDEI, D APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BACCHETTA, N BAILEY, MW BAMBERGER, A BARNETT, BA BARBAROGALTIERI, A BARNES, VE BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BHADRA, S BINKLEY, M BLAIR, R BLOCKER, C BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CURATOLO, M DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DRUCKER, RB ELIAS, JE ELY, R ENO, S ERREDE, S ESPOSITO, B FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y FUNAYAMA, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GOULIANOS, K GRASSMANN, H GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRIS, RM HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, S KIRSCH, L KONDO, K KONIGSBERG, J KOVACS, E KUHLMANN, SE KUNS, E LAASANEN, AT LAMOUREUX, JI LEONE, S LI, W LISS, TM LOCKYER, N LUCHINI, CB LUKENS, P MAAS, P MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A NAKAE, LF NAKANO, I NELSON, C NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PARA, A PARE, E PATRICK, J PHILLIPS, TJ PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SEKIGUCHI, M SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L STDENIS, R STEFANINI, A SULLIVAN, G SWARTZ, RL TAKANO, M TARTARELLI, F TAKIKAWA, K TAREM, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WILLIAMS, HH WINER, BL WYSS, J YAGIL, A YAMASHITA, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZUCCHELLI, S TI MEASUREMENT OF B0BBAR0 MIXING AT THE FERMILAB TEVATRON COLLIDER SO PHYSICAL REVIEW LETTERS LA English DT Article ID PBARP INTERACTIONS; CHARGED-PARTICLES; SEARCH AB The B0B0BAR average mixing parameter-chi has been extracted from e-mu and ee events produced in ppBAR collisions at square-root = 1.8 TeV. In a sample of 900 e-mu-events, the like-sign to opposite-sign charge ratio R is measured to be 0.556 +/- 0.048(stat)-0.042(+0.05)(syst). In the absence of mixing, the expected value of R would be 0.23 + 0.06. The corresponding number for 212 ee events is 0.573 +/- 0.116(stat) +/- 0.047(syst) with an expected nonmixing value of 0.24 +/- 0.07. The observed excess in R leads to a combined determination of chi = 0.176 +/- 0.031 (stat + syst) +/- 0.032(model), where the last uncertainty is due to Monte Carlo modeling. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. BRANDEIS UNIV,WALTHAM,MA 02254. UNIV CHICAGO,CHICAGO,IL 60637. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,LAB NAZL FRASCATI,FRASCATI,ITALY. HARVARD UNIV,CAMBRIDGE,MA 02138. UNIV ILLINOIS,URBANA,IL 61801. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. IST NAZL FIS NUCL,I-35131 PADUA,ITALY. UNIV PENN,PHILADELPHIA,PA 19104. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14627. ROCKEFELLER UNIV,NEW YORK,NY 10021. RUTGERS STATE UNIV,PISCATAWAY,NJ 08854. TEXAS A&M UNIV SYST,COLLEGE STN,TX 77843. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. TUFTS UNIV,MEDFORD,MA 02155. UNIV WISCONSIN,MADISON,WI 53706. RP ABE, F (reprint author), NATL LAB HIGH ENERGY PHYS,IBARAKI,JAPAN. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Punzi, Giovanni/J-4947-2012; OI Chiarelli, Giorgio/0000-0001-9851-4816; Punzi, Giovanni/0000-0002-8346-9052; Bertolucci, Sergio/0000-0003-1738-4736 NR 18 TC 26 Z9 26 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 DEC 9 PY 1991 VL 67 IS 24 BP 3351 EP 3355 DI 10.1103/PhysRevLett.67.3351 PG 5 WC Physics, Multidisciplinary SC Physics GA GT900 UT WOS:A1991GT90000008 ER PT J AU VANDERHOEF, MA FRENKEL, D LADD, AJC AF VANDERHOEF, MA FRENKEL, D LADD, AJC TI SELF-DIFFUSION OF COLLOIDAL PARTICLES IN A 2-DIMENSIONAL SUSPENSION - ARE DEVIATIONS FROM FICK LAW EXPERIMENTALLY OBSERVABLE SO PHYSICAL REVIEW LETTERS LA English DT Article ID GAS CELLULAR AUTOMATA; HYDRODYNAMIC INTERACTIONS; VELOCITY AUTOCORRELATION; BROWNIAN-MOTION; TIME BEHAVIOR; DECAY AB Simulations of a colloidal particle suspended in a two-dimensional fluid are reported. The dissipative and fluctuating hydrodynamic forces acting on the particle are modeled by a lattice gas. Our results indicate that large long-time tails are present in both the translational and the rotational velocity correlation functions; these are the first observations of a rotational long-time tail. The strong translational tail leads to an observable renormalization of the diffusion coefficient; our results suggest that experimental observation of the latter effect is possible. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP VANDERHOEF, MA (reprint author), FOM,INST ATOM & MOLEC PHYS,KRUISLAAN 407,1098 SJ AMSTERDAM,NETHERLANDS. RI Frenkel, Daan/G-2580-2014 OI Frenkel, Daan/0000-0002-6362-2021 NR 15 TC 24 Z9 24 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 DEC 9 PY 1991 VL 67 IS 24 BP 3459 EP 3462 DI 10.1103/PhysRevLett.67.3459 PG 4 WC Physics, Multidisciplinary SC Physics GA GT900 UT WOS:A1991GT90000035 ER PT J AU ABRAHAM, MM BAKER, JM BLEANEY, B JENKINS, AA MARTINEAU, PM PFEFFER, JZ AF ABRAHAM, MM BAKER, JM BLEANEY, B JENKINS, AA MARTINEAU, PM PFEFFER, JZ TI MAGNETIC-RESONANCE OF LANTHANIDE IONS AS MAGNETIC PROBES IN THE ANTIFERROMAGNETIC PHASE OF DYSPROSIUM PHOSPHATE SO PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES LA English DT Article AB Measurements of electron magnetic resonance are discussed for impurity ions in the antiferromagnetic host compound DyPO4 (Neel temperature T(N) = 3.39 K). This is a simple two sublattice antiferromagnet; the impurity ions are Yb3+ and Er3+ each with a Kramers doublet as the ground state. Resonance is observed at frequencies of ca. 24 and 34 GHz, and the angular dependence of the magnetic field is fitted to simple theoretical equations. Since the magnetic moments in the host lattice are ordered, the resonance lines are relatively narrow, making it possible to determine the value of the internal field acting on each impurity ion. From this, the exchange field is obtained by subtracting the value of the dipolar field generated by the ordered moments of the host ions. Some measurements have been made in the spin flop phase. The values of the exchange field are found not to conform to a simple model based on isotropic exchange interaction between the real electron spins of the lanthanide ions. Hyperfine splitting is detected from the odd isotope Yb-171, natural abundance 14%, I = 1/2. C1 OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831. RP ABRAHAM, MM (reprint author), CLARENDON LAB,PARKS RD,OXFORD OX1 3UP,ENGLAND. NR 17 TC 7 Z9 7 U1 2 U2 2 PU ROYAL SOC LONDON PI LONDON PA 6 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5AG SN 1364-5021 J9 P ROY SOC LOND A MAT JI Proc. R. Soc. London Ser. A-Math. Phys. Eng. Sci. PD DEC 9 PY 1991 VL 435 IS 1895 BP 605 EP 614 DI 10.1098/rspa.1991.0164 PG 10 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GV466 UT WOS:A1991GV46600009 ER PT J AU LAMBERTH, C BEDNARSKI, MD AF LAMBERTH, C BEDNARSKI, MD TI AN EFFICIENT METHOD FOR THE DEPROTECTION OF ALLYL GLYCOSIDES WITH ADJACENT AZIDES - THE CIRCUMVENTION OF UNWANTED DIPOLAR CYCLOADDITION PRODUCTS SO TETRAHEDRON LETTERS LA English DT Article DE ALLYL GLYCOSIDE; DEPROTECTION; DIPOLAR CYCLOADDITION ID CELL-SURFACE GLYCANS; CAPSULAR POLYSACCHARIDE; CARBOHYDRATE-CHEMISTRY; BUILDING-BLOCKS; REPEATING UNIT; ACID; TRISACCHARIDE; OLIGOSACCHARIDES; ETHERS; TETRASACCHARIDE AB A two step deallylation scheme using (bis(methyldiphenylphosphine)) (1,5-cyclooctadiene) iridium (I) hexafluorophosphate and catalytic amounts of osmium tetroxide with trimethylamine N-oxide is used to deprotect allyl glycosides in the presence of an azide group at C-2. This method avoids the formation of intramolecular 1,3-dipolar cycloaddition products which are isolated during the deprotection using other procedures. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. NR 37 TC 23 Z9 23 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0040-4039 J9 TETRAHEDRON LETT JI Tetrahedron Lett. PD DEC 9 PY 1991 VL 32 IS 50 BP 7369 EP 7372 DI 10.1016/0040-4039(91)80109-J PG 4 WC Chemistry, Organic SC Chemistry GA GW743 UT WOS:A1991GW74300005 ER PT J AU COFFEY, MW AF COFFEY, MW TI ON THE INTEGRABILITY OF SCHAMELS MODIFIED KORTEWEG-DEVRIES EQUATION SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Letter ID PARTIAL-DIFFERENTIAL EQUATIONS; ION-ACOUSTIC WAVES; DE-VRIES EQUATION; PAINLEVE PROPERTY; SOLITARY; SOLITONS AB A recent suggestion of integrability of Schamel's modified Korteweg-de Vries equation for ion acoustic waves in a two-component plasma is discussed. Various arguments, including ones based on the truncated Painleve expansion, are presented which support the existence of special structure for this equation. However, the evidence for complete integrability of Schamel's equation is not yet conclusive. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP COFFEY, MW (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 33 TC 11 Z9 11 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0305-4470 J9 J PHYS A-MATH GEN JI J. Phys. A-Math. Gen. PD DEC 7 PY 1991 VL 24 IS 23 BP L1345 EP L1352 PG 8 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA GW754 UT WOS:A1991GW75400005 ER PT J AU ERBER, T HOCKNEY, GM AF ERBER, T HOCKNEY, GM TI EQUILIBRIUM-CONFIGURATIONS OF N EQUAL CHARGES ON A SPHERE SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Letter AB The emergence of new levels of complexity that often accompanies the transition from few- to many-body systems is clearly illustrated by the progression of equilibrium states of N charges on the surface of a sphere as N increases. The characteristics of these electrostatic equilibrium states in the range 2 less-than-or-equal-to N less-than-or-equal-to 65 can be examined in detail by equilibrating 1000 randomized initial configurations for every value of N. As N increases, the equilibrium states undergo a succession of structural changes. For instance, a state with non-zero dipole moment appears at N = 11, an enantiometric or mirror image state appears at N = 15, and a robust metastable state appears at N = 16. For values of N exceeding 50, clusters of four or more metastable states with energies within 0.01% of each other are the dominant pattern. In analogy with some other complex systems, these energetically similar states have strikingly different asymmetric configurations. C1 FERMI NATL ACCELERATOR LAB,DEPT THEORET PHYS,BATAVIA,IL 60510. IIT,DEPT MATH,CHICAGO,IL 60616. RP ERBER, T (reprint author), IIT,DEPT PHYS,CHICAGO,IL 60616, USA. NR 16 TC 93 Z9 94 U1 1 U2 5 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0305-4470 J9 J PHYS A-MATH GEN JI J. Phys. A-Math. Gen. PD DEC 7 PY 1991 VL 24 IS 23 BP L1369 EP L1377 PG 9 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA GW754 UT WOS:A1991GW75400008 ER PT J AU XIANG, XD VAREKA, WA ZETTL, A CORKILL, JL BARBEE, TW COHEN, ML KIJIMA, N GRONSKY, R AF XIANG, XD VAREKA, WA ZETTL, A CORKILL, JL BARBEE, TW COHEN, ML KIJIMA, N GRONSKY, R TI TUNING HIGH-TC SUPERCONDUCTORS VIA MULTISTAGE INTERCALATION SO SCIENCE LA English DT Article ID SUPERLATTICES; TEMPERATURE AB Multistage intercalation has been used to tune the interaction between adjacent blocks of CuO2 sheets in the high-T(c) (high superconducting transition temperature) superconductor Bi2Sr2CaCu2Ox. As revealed by atomic-resolution transmission electron microscopy images, foreign iodine atoms are intercalated into every nth BiO bilayer of the host crystal, resulting in structures of stoichiometry IBi(2n)Sr(2n)Ca(n)Cu(2n)O(x) with stage index n up to 4. An expansion of 3.6 angstroms for each intercalated BiO bilayer decouples the CuO2 sheets in adjacent blocks. A comparison of the superconducting transition temperatures of the pristine host material and intercalated compounds of different stages suggests that the coupling between each pair of adjacent blocks contributes approximately 5 K to T(c) in Bi2Sr2CaCu2Ox. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,NATL CTR ELECTR MICROSCOPY,BERKELEY,CA 94720. RI Xiang, Xiaodong/A-9445-2012; Zettl, Alex/O-4925-2016; Xiang, Xiaodong/A-5936-2017 OI Zettl, Alex/0000-0001-6330-136X; NR 8 TC 44 Z9 44 U1 1 U2 10 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD DEC 6 PY 1991 VL 254 IS 5037 BP 1487 EP 1489 DI 10.1126/science.254.5037.1487 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GT903 UT WOS:A1991GT90300033 PM 17773298 ER PT J AU YOO, CS NELLIS, WJ AF YOO, CS NELLIS, WJ TI PHASE-TRANSFORMATIONS IN CARBON FULLERENES AT HIGH SHOCK PRESSURES SO SCIENCE LA English DT Article ID GRAPHITE; C-60; DIAMOND AB C60 powders were shock-compressed quasi-isentropically and quenched from pressures in the range 10 to 110 GPa (0.1 to 1.1 Mbar). Recovered specimens were analyzed by Raman spectroscopy and optical microscopy. C60 fullerenes are stable into the 13- to 17-GPa pressure range. The onset of a fast (approximately 0.5-mu-s) reconstructive transformation to graphite occurs near 17 GPa. The graphite recovered from 27 GPa and about 600-degrees-C is relatively well ordered with crystal planar domain size of about 100 angstrom. Above 50 GPa a continuous transformation to an amorphous state is observed in recovered specimens. The fast transformation to graphite is proposed to occur by pi-electron rehybridization which initiates breakup of the ball structure and formation of the graphite structure at high density. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. RP YOO, CS (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,DIV H,LIVERMORE,CA 94550, USA. NR 29 TC 94 Z9 94 U1 2 U2 11 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD DEC 6 PY 1991 VL 254 IS 5037 BP 1489 EP 1491 DI 10.1126/science.254.5037.1489 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GT903 UT WOS:A1991GT90300034 PM 17773299 ER PT J AU ACKERMAN, JP SETTLE, JL AF ACKERMAN, JP SETTLE, JL TI PARTITION OF LANTHANUM AND NEODYMIUM METALS AND CHLORIDE SALTS BETWEEN MOLTEN CADMIUM AND MOLTEN LICL-KCL EUTECTIC SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article AB The distribution of lanthanum and neodymium between a molten cadmium pool and molten LiCl-KCl eutectic was measured over the temperature range 753-788 K. Lanthanum and neodymium metals in amounts more than sufficient to form a saturated solution were added to cadmium then progressively oxidized to salt-soluble trichlorides by additions of cadmium chloride. In the early stages of oxidation a solid metal phase existed; it can be described as a solid solution of LaCd11 and NdCd11. A regular solution solubility parameter of -1990 +/- 390 (+/- 2-sigma) was derived for the solid solution. In the later stages of oxidation only an unsaturated solution of lanthanum and neodymium in cadmium existed. Lanthanum was slightly more easily oxidized than neodymium; a separation factor of 2.5 +/- 1.1 was measured. RP ACKERMAN, JP (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439, USA. NR 13 TC 10 Z9 10 U1 1 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD DEC 5 PY 1991 VL 177 IS 1 BP 129 EP 141 DI 10.1016/0925-8388(91)90063-2 PG 13 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA GT396 UT WOS:A1991GT39600016 ER PT J AU STEWART, GR HAIRE, RG SPIRLET, JC REBIZANT, J AF STEWART, GR HAIRE, RG SPIRLET, JC REBIZANT, J TI SPECIFIC-HEATS OF NPTE AND PUTE SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article AB The specific heats of single crystals of NpTe and PuTe have been measured in the ranges 1.5-36 K and 5-9.5 K respectively, in a calorimeter designed for small samples. These measurements are the first at sufficiently low temperatures to allow a firm determination of each material's electronic contribution, gamma-T, to its specific heat. Both of these materials were found to be quite metallic in nature, with the gamma (in mJ mol-1 K-2) for PuTe equal to 30 +/- 5 and that for NpTe being 130 +/- 10. These data are compared with previous results from other measurements and the implications for understanding the electronic nature of plutonium in PuTe are discussed. C1 UNIV AUGSBURG,W-8900 AUGSBURG,GERMANY. OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. COMMISS EUROPEAN COMMUNITIES,EUROPEAN INST TRANSURANIUM ELEMENTS,JOINT RES CTR,W-7500 KARLSRUHE,GERMANY. RP STEWART, GR (reprint author), UNIV FLORIDA,GAINESVILLE,FL 32611, USA. NR 12 TC 13 Z9 13 U1 1 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD DEC 5 PY 1991 VL 177 IS 1 BP 167 EP 171 DI 10.1016/0925-8388(91)90067-6 PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA GT396 UT WOS:A1991GT39600020 ER PT J AU DAU, H SAUER, K AF DAU, H SAUER, K TI ELECTRIC-FIELD EFFECT ON CHLOROPHYLL FLUORESCENCE AND ITS RELATION TO PHOTOSYSTEM-II CHARGE SEPARATION REACTIONS STUDIED BY A SALT-JUMP TECHNIQUE SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Article DE CHARGE SEPARATION; DIFFUSION POTENTIAL; ELECTROCHROMIC ABSORBENCY CHANGE; FLUORESCENCE; THYLAKOID MEMBRANE ID DELAYED LIGHT EMISSION; REACTION CENTERS; BACTERIAL PHOTOSYNTHESIS; SPINACH-CHLOROPLASTS; THYLAKOID MEMBRANES; ABSORBANCE CHANGES; KINETICS; EXCITATION; STIMULATION; GRADIENTS AB Across the thylakoid membrane of spinach chloroplasts a diffusion potential was created by rapid changes in the KCl concentration (salt-jumps) employing a flow and mixing technique. The analysis of salt-induced electrochromic absorbance changes indicates that under appropriate experimental conditions the salt-jump technique facititates the establishment of a well-defined thylakoid voltage. This approach appears to be well suited for quantitative studies of electric field effects on thylakoid reactions. In the open reaction center state, for positive salt-induced thylakoid voltages (positive at the lumenal side) the fluorescence yield of spinach thylakoids increases; for negative voltages it decreases. A linear relation between fluorescence yield and thylakoid voltage is observed in the range from -70 mV to +165 mV, characterized by a change of the fluorescence yield by 9% (+/- 2%) per 100 mV. Analysis of the fluorescence emission spectra reveals that the electric field effect (i) does not originate from a Stark shift of the emission spectrum and (ii) reflects an influence on the Photosystem II (PS II) fluorescence. With increasing degree of PS II trap-closure, the extent of the electric field effect decreases, and in the closed reaction center state no effect is detectable. The trap-closure sensitivity suggests that the electric field effect on the fluorescence yield originates from an electric field dependence of the PS II charge separation/recombination reactions. We propose that the observed fluorescence yield-thylakoid voltage relation reflects the free energy dependence of the rate constants of the PS II charge transfer reactions. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP DAU, H (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 54 TC 35 Z9 36 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0006-3002 J9 BIOCHIM BIOPHYS ACTA PD DEC 3 PY 1991 VL 1098 IS 1 BP 49 EP 60 PG 12 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA GW268 UT WOS:A1991GW26800007 ER PT J AU PEREIRA, MF KOCH, SW CHOW, WW AF PEREIRA, MF KOCH, SW CHOW, WW TI MANY-BODY EFFECTS IN THE GAIN SPECTRA OF STRAINED QUANTUM-WELLS SO APPLIED PHYSICS LETTERS LA English DT Article ID SEMICONDUCTOR-LASERS; HETEROJUNCTIONS AB A many-body theory for the optical susceptibility in highly excited strained-layer quantum wells is presented. Gain spectra are computed for the example of InxGa1-xAs/InP and different In concentrations, yielding zero, tensile, and compressive strain. C1 SANDIA NATL LABS,DIV 2535,ALBUQUERQUE,NM 87185. RP PEREIRA, MF (reprint author), UNIV ARIZONA,CTR OPT SCI,DEPT PHYS,TUCSON,AZ 85721, USA. NR 17 TC 25 Z9 25 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD DEC 2 PY 1991 VL 59 IS 23 BP 2941 EP 2943 DI 10.1063/1.105830 PG 3 WC Physics, Applied SC Physics GA GT017 UT WOS:A1991GT01700007 ER PT J AU FRIEDMAN, DJ KIBBLER, AE OLSON, JM AF FRIEDMAN, DJ KIBBLER, AE OLSON, JM TI CATION SITE ORDERING AND CONDUCTION ELECTRON-SCATTERING IN GAINP2 SO APPLIED PHYSICS LETTERS LA English DT Article ID IN1-XGAXASYP1-Y; GA0.5IN0.5P; PARAMETERS; TRANSPORT; MOBILITY AB We present Hall mobility data mu(T) in the range T = 300-600 K for GaInP2, an alloy whose band gap has been shown to decrease with increasing compositional ordering. Samples grown to give high ordering are found to have consistently lower mobilities than samples with low ordering, suggesting that the mobility is limited by cluster scattering by ordered domains. We analyze mu(T) in terms of a cluster scattering model developed by Marsh [Appl. Phys. Lett. 41, 732 (1982)] and others to estimate the relative volume fraction of cluster scattering sites in the ordered and disordered material. RP FRIEDMAN, DJ (reprint author), SOLAR ENERGY RES INST,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 15 TC 32 Z9 32 U1 0 U2 2 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD DEC 2 PY 1991 VL 59 IS 23 BP 2998 EP 3000 DI 10.1063/1.105823 PG 3 WC Physics, Applied SC Physics GA GT017 UT WOS:A1991GT01700026 ER PT J AU FAJER, J AF FAJER, J TI THE MYSTERIES OF PORPHYRIN CHEMISTRY SO CHEMISTRY & INDUSTRY LA English DT Article ID PHOTOSYNTHETIC REACTION CENTER; PRIMARY CHARGE SEPARATION; RHODOPSEUDOMONAS-VIRIDIS; BACTERIAL PHOTOSYNTHESIS; ELECTRON-TRANSFER; CATION RADICALS; BACTERIOCHLOROPHYLL; CHLOROPHYLLS; SIROHYDROCHLORIN; SIROHEME RP FAJER, J (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. NR 52 TC 37 Z9 37 U1 0 U2 1 PU SOC CHEMICAL INDUSTRY PI LONDON PA 14 BELGRAVE SQUARE, LONDON, ENGLAND SW1X 8PS SN 0009-3068 J9 CHEM IND-LONDON JI Chem. Ind. PD DEC 2 PY 1991 IS 23 BP 869 EP 873 PG 5 WC Chemistry, Applied SC Chemistry GA GT609 UT WOS:A1991GT60900006 ER PT J AU YE, YY HO, KM CHEN, Y HARMON, BN AF YE, YY HO, KM CHEN, Y HARMON, BN TI CALCULATION OF THE TEMPERATURE-DEPENDENCE OF THE VIBRATIONAL-MODES OF MOLYBDENUM SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID TOTAL-ENERGY CALCULATIONS; TRANSITION-METALS; PHONON AB First-principles total energy calculations are used to derive the anharmonic coupling parameters for the phonon-phonon interactions in molybdenum. The calculated frequency shifts from 10 to 295 K are in reasonably good agreement with experiment. The derived anharmonic forces are analysed in terms of a central potential and bond-bending terms which are found to be significant. C1 WUHAN UNIV,DEPT PHYS,WUHAN,PEOPLES R CHINA. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP YE, YY (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 15 TC 9 Z9 9 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 DEC 2 PY 1991 VL 3 IS 48 BP 9629 EP 9636 DI 10.1088/0953-8984/3/48/005 PG 8 WC Physics, Condensed Matter SC Physics GA GU327 UT WOS:A1991GU32700005 ER PT J AU TURKEVICH, AL ECONOMOU, TE COWAN, GA AF TURKEVICH, AL ECONOMOU, TE COWAN, GA TI DOUBLE BETA-DECAY OF U-238 SO PHYSICAL REVIEW LETTERS LA English DT Article ID 17-KEV NEUTRINO; SPECTRUM; RATES AB The half-life for the decay of U-238 to Pu-238 has been measured to be (2.0 +/- 0.6) x 10(21) yr by chemically isolating and measuring, from the resultant alpha particles, the amount of plutonium that had accumulated in 33 yr from 8.47 kg of purified uranyl nitrate. Other sources of Pu-238 have been studied and found negligible. C1 UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637. SANTA FE INST,SANTA FE,NM 87501. UNIV CALIF LOS ALAMOS SCI LAB,SANTA FE,NM 87501. RP TURKEVICH, AL (reprint author), UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637, USA. NR 25 TC 71 Z9 71 U1 2 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD DEC 2 PY 1991 VL 67 IS 23 BP 3211 EP 3214 DI 10.1103/PhysRevLett.67.3211 PG 4 WC Physics, Multidisciplinary SC Physics GA GT014 UT WOS:A1991GT01400003 ER PT J AU FOSTER, JM HOARTY, DJ SMITH, CC ROSEN, PA DAVIDSON, SJ ROSE, SJ PERRY, TS SERDUKE, FJD AF FOSTER, JM HOARTY, DJ SMITH, CC ROSEN, PA DAVIDSON, SJ ROSE, SJ PERRY, TS SERDUKE, FJD TI L-SHELL ABSORPTION-SPECTRUM OF AN OPEN-M-SHELL GERMANIUM PLASMA - COMPARISON OF EXPERIMENTAL-DATA WITH A DETAILED CONFIGURATION-ACCOUNTING CALCULATION SO PHYSICAL REVIEW LETTERS LA English DT Article ID SPECTROSCOPY; TEMPERATURE; OPACITY; DENSITY AB The radiative opacity of a near local thermodynamic equilibrium, open-M-shell Ge plasma has been measured in the region of the 2p-3d and 2p-4d transition arrays, and is compared for the first time with the results of a detailed configuration-accounting calculation which includes an approximate treatment of term widths. The plasma was generated by radiation heating using thermal x radiation from a laser-produced gold plasma. Temperature and density were characterized in experiments which observed the absorption spectra of Al and Mg plasmas and by radiographic measurements of the expansion of the heated foil samples. C1 RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP FOSTER, JM (reprint author), ATOM WEAP RES ESTAB,READING RG7 4PR,BERKS,ENGLAND. RI Perry, Theodore/K-3333-2014 OI Perry, Theodore/0000-0002-8832-2033 NR 17 TC 94 Z9 95 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 DEC 2 PY 1991 VL 67 IS 23 BP 3255 EP 3258 DI 10.1103/PhysRevLett.67.3255 PG 4 WC Physics, Multidisciplinary SC Physics GA GT014 UT WOS:A1991GT01400014 ER PT J AU REMINGTON, BA HAAN, SW GLENDINNING, SG KILKENNY, JD MUNRO, DH WALLACE, RJ AF REMINGTON, BA HAAN, SW GLENDINNING, SG KILKENNY, JD MUNRO, DH WALLACE, RJ TI LARGE GROWTH RAYLEIGH-TAYLOR EXPERIMENTS USING SHAPED LASER-PULSES SO PHYSICAL REVIEW LETTERS LA English DT Article ID HYDRODYNAMIC INSTABILITIES; FUSION; DRIVEN; STABILITY; SIMULATIONS; IMPLOSIONS; TARGET; RATES AB Large growth Rayleigh-Taylor (RT) experiments have been conducted by pulse-shaped radiative acceleration of planar fluorosilicone foils with 50-mu-m-wavelength initial surface perturbations. Foils with large-amplitude initial perturbation quickly enter the nonlinear RT regime, and show little growth. Foils with very-small-amplitude initial perturbations grow exponentially for longer, and show much larger growth factors. From comparisons with two-dimensional computer simulations, we deduce that the observed growth is about 60% of that expected for classical RT growth. RP REMINGTON, BA (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 30 TC 79 Z9 83 U1 0 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD DEC 2 PY 1991 VL 67 IS 23 BP 3259 EP 3262 DI 10.1103/PhysRevLett.67.3259 PG 4 WC Physics, Multidisciplinary SC Physics GA GT014 UT WOS:A1991GT01400015 ER PT J AU FISK, Z CANFIELD, PC BEYERMANN, WP THOMPSON, JD HUNDLEY, MF OTT, HR FELDER, E MAPLE, MB DELATORRE, MAL VISANI, P SEAMAN, CL AF FISK, Z CANFIELD, PC BEYERMANN, WP THOMPSON, JD HUNDLEY, MF OTT, HR FELDER, E MAPLE, MB DELATORRE, MAL VISANI, P SEAMAN, CL TI MASSIVE ELECTRON STATE IN YBBIPT SO PHYSICAL REVIEW LETTERS LA English DT Article AB Measurements of the electrical resistivity, magnetoresistance, ac and dc magnetic susceptibility, and specific heat on YbBiPt indicate this compound to be a very heavy-electron system. The low-temperature Sommerfeld coefficient of 8 J/K2 (mole Yb) is not affected by a phase transition at 0.4 K. We suggest that the heavy-mass state in YbBiPt is unconventional in that it develops from Bloch states in an electronic subsystem with low carrier concentration. C1 SWISS FED INST TECHNOL,CH-8092 ZURICH,SWITZERLAND. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. RP FISK, Z (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. RI Canfield, Paul/H-2698-2014; Lopez de la Torre, Marco /K-6394-2014 OI Lopez de la Torre, Marco /0000-0002-9455-6733 NR 12 TC 107 Z9 107 U1 1 U2 12 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 DEC 2 PY 1991 VL 67 IS 23 BP 3310 EP 3313 DI 10.1103/PhysRevLett.67.3310 PG 4 WC Physics, Multidisciplinary SC Physics GA GT014 UT WOS:A1991GT01400028 ER PT J AU BAILEY, PB GARBOW, BS KAPER, HG ZETTL, A AF BAILEY, PB GARBOW, BS KAPER, HG ZETTL, A TI EIGENVALUE AND EIGENFUNCTION COMPUTATIONS FOR STURM-LIOUVILLE PROBLEMS SO ACM TRANSACTIONS ON MATHEMATICAL SOFTWARE LA English DT Article DE ALGORITHMS; BOUNDARY VALUE PROBLEMS; DIFFERENTIAL EQUATIONS; EIGENFUNCTIONS; EIGENVALUES; INDEFINITE WEIGHT FUNCTIONS; MATHEMATICAL SOFTWARE; PRUFER TRANSFORMATION; REGULAR BOUNDARY VALUE PROBLEMS; SINGULAR BOUNDARY VALUE PROBLEMS; STURM-LIOUVILLE PROBLEMS; SEMIDEFINITE WEIGHT FUNCTIONS ID INDEFINITE WEIGHTS AB SLEIGN is a software package for the computation of eigenvalues and eigenfunctions of regular and singular Sturm-Liouville boundary value problems. The package is a modification and extension of a code with the same name developed by Bailey, Gordon, and Shampine, which is described in ACM TOMS 4 (1978), 193-208. The modifications and extensions include (1) a restructuring of the FORTRAN program, (2) the coverage of problems with semidefinite weight functions, and (3) the coverage of problems with indefinite weight functions. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. ARGONNE NATL LAB,ARGONNE,IL 60439. NO ILLINOIS UNIV,DEPT MATH SCI,DE KALB,IL 60115. NR 19 TC 18 Z9 19 U1 0 U2 1 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 DEC PY 1991 VL 17 IS 4 BP 491 EP 499 DI 10.1145/210232.210238 PG 9 WC Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA KZ399 UT WOS:A1991KZ39900006 ER PT J AU BAILEY, PB GARBOW, BS KAPER, HG ZETTL, A AF BAILEY, PB GARBOW, BS KAPER, HG ZETTL, A TI A FORTRAN SOFTWARE PACKAGE FOR STURM-LIOUVILLE PROBLEMS SO ACM TRANSACTIONS ON MATHEMATICAL SOFTWARE LA English DT Software Review DE ALGORITHMS; SLEIGN; STURM-LIOUVILLE PROBLEM; FORTRAN C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. ARGONNE NATL LAB,ARGONNE,IL 60439. NO ILLINOIS UNIV,DEPT MATH SCI,DE KALB,IL 60115. NR 3 TC 16 Z9 16 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 DEC PY 1991 VL 17 IS 4 BP 500 EP 501 DI 10.1145/210232.210239 PG 2 WC Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA KZ399 UT WOS:A1991KZ39900007 ER PT J AU JOHNSON, JN LOMDAHL, PS WILLS, JM AF JOHNSON, JN LOMDAHL, PS WILLS, JM TI ANALYSIS OF INTERNAL-STRESS AND ANELASTICITY IN THE SHOCK-COMPRESSED STATE FROM UNLOADING WAVE DATA SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID PRECURSOR DECAY; LIF; PROPAGATION; SOLIDS AB Time-resolved shock-wave measurements have often been used to infer microstructural behavior in crystalline solids. We apply this approach to an interpretation of the release-wave response of an aluminum alloy (6061-T6) as it is dynamically unloaded from a shock-compressed state of 20.7 GPa. The anelastic behavior in the initial portion of the unloading wave is attributed to the accumulation of internal stresses created by the shock process. Specific internal-stress models which are investigated are (i) the double pile-up, (ii) the single pile-up, and (iii) single dislocation loops between pinning points. It is found that the essential characteristics of double and single pile-ups can be represented by a single dislocation between two pinned dislocations of like sign. Calculations of anelastic wave speeds at constant unloading strain rate are then compared with experimental data. The results suggest that the residual internal stress is due to pinned loops of density 10(15)m-2, and that the viscous drag coefficient in the shock-compressed state is on the order of 10(-7) MPa s (approximately two orders of magnitude greater than expected under ambient conditions). RP JOHNSON, JN (reprint author), UNIV CALIF LOS ALAMOS SCI LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. NR 29 TC 8 Z9 8 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 DEC PY 1991 VL 39 IS 12 BP 3015 EP 3026 DI 10.1016/0956-7151(91)90034-X PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA GU684 UT WOS:A1991GU68400008 ER PT J AU NAJAFABADI, R WANG, HY SROLOVITZ, DJ LESAR, R AF NAJAFABADI, R WANG, HY SROLOVITZ, DJ LESAR, R TI A NEW METHOD FOR THE SIMULATION OF ALLOYS - APPLICATION TO INTERFACIAL SEGREGATION SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID EMBEDDED-ATOM-METHOD; NI-CU ALLOYS; BOUNDARY; METALS; AU AB We present a new, accurate method for determining the properties of defects in alloys at finite temperature, including equilibrium segregation. This method is based upon a point approximation for the configurational entropy, an Einstein model for vibrational contributions to the free energy and may be employed with any type of description of atomic interactions. The atomic structure, segregation and thermodynamics of a defect in an alloy is determined by minimizing the free energy with respect to atomic coordinates and composition of each site at constant chemical potential. In order to test the accuracy of this approach, we compare our results with accurate Monte Carlo determinations. Overall, very good agreement for segregation to free surfaces and grain boundaries in Cu-Ni alloys is obtained. One of the main advantages this new method enjoys over other methods such as Monte Carlo, is the efficiency with which the atomic structure of a defect, segregation and thermodynamic properties can be determined. This efficiency is obtained in the framework of a very straightforward method and with little loss in accuracy. C1 UNIV CALIF LOS ALAMOS SCI LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. RP NAJAFABADI, R (reprint author), UNIV MICHIGAN, DEPT MAT SCI & ENGN, ANN ARBOR, MI 48109 USA. RI LeSar, Richard/G-1609-2012 NR 19 TC 45 Z9 45 U1 3 U2 13 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 DEC PY 1991 VL 39 IS 12 BP 3071 EP 3082 DI 10.1016/0956-7151(91)90040-8 PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA GU684 UT WOS:A1991GU68400014 ER PT J AU SEKI, A SEIDMAN, DN OH, Y FOILES, SM AF SEKI, A SEIDMAN, DN OH, Y FOILES, SM TI MONTE-CARLO SIMULATIONS OF SEGREGATION AT [001] TWIST BOUNDARIES IN A PT(AU) ALLOY .1. RESULTS SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID EMBEDDED-ATOM-METHOD; LATTICE-GAS-MODEL; SURFACE-SANDWICH SEGREGATION; ENERGY ELECTRON-DIFFRACTION; DILUTE COBALT ALLOYS; FIELD-ION MICROSCOPE; NI-CU ALLOYS; FCC METALS; RESOLUTION OBSERVATIONS; GRAIN-BOUNDARIES AB Monte Carlo simulations utilizing embedded atom method (EAM) potentials are used to study segregation of Au atoms-T = 850 to 1900 K-to [001] twist boundaries in a Pt-1.0 at.% Au bicrystal containing almost-equal-to 5000 atoms. The twist angle (theta) ranges from 0 to 45-degrees. The average segregation factor (S(aver)), defined as a ratio of the Au concentration in the two (002) planes which adjoin the interface over the bulk value, increases linearly as theta increases to almost-equal-to 35-degrees; S(aver) decreases exponentially as T increases at each value of theta; the range of S(aver) is almost-equal-to (1.2-3.5). No evidence is found for a systematic relationship between S(aver) and the SIGMA-value. The relationship between S(aver) and theta is a result of the Au atoms segregating primarily substitutionally to the cores of pairs of orthogonal primary grain boundary dislocations (Part II). C1 NORTHWESTERN UNIV, ROBERT R MCCORMICK SCH ENGN & APPL SCI, EVANSTON, IL 60208 USA. SANDIA NATL LABS, DIV THEORET, LIVERMORE, CA 94551 USA. RP SEKI, A (reprint author), NORTHWESTERN UNIV, DEPT MAT SCI & ENGN, EVANSTON, IL 60208 USA. RI Seidman, David/B-6697-2009; OI Foiles, Stephen/0000-0002-1907-454X NR 78 TC 47 Z9 47 U1 0 U2 4 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 DEC PY 1991 VL 39 IS 12 BP 3167 EP 3177 DI 10.1016/0956-7151(91)90051-2 PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA GU684 UT WOS:A1991GU68400025 ER PT J AU SEKI, A SEIDMAN, DN OH, Y FOILES, SM AF SEKI, A SEIDMAN, DN OH, Y FOILES, SM TI MONTE-CARLO SIMULATIONS OF SEGREGATION AT [001] TWIST BOUNDARIES IN A PT(AU) ALLOY .2. DISCUSSION SO ACTA METALLURGICA ET MATERIALIA LA English DT Article AB A three dimensional plot of the density of Au atoms versus the position coordinates for the (002) planes, immediately adjacent to the interface, for a theta = 5-degrees [001] twist boundary, suggests the presence of a hill-and-valley structure in the Au segregation behavior at 850 K. The valleys correspond to the regions of good atomic fit between the regions of misfit; the hills correspond to the cores of the pairs of orthogonal primary grain boundary dislocations. A model for the Monte Carlo simulations is developed that leads to a linear expression for S(aver) containing a core segregation factor (S(core)). For this model S(core) has a single value for all twist boundaries at a given T. All the Monte Carlo results can be plotted on a single Arrhenius plot and the Gibbs free binding energy of a Au atom to the cores of the primary grain boundary dislocations extracted; the binding enthalpy and entropy of segregation are 0.095 +/- 0.01 eV and k(B) (0.49 +/- 0.10) respectively. C1 NORTHWESTERN UNIV, ROBERT R MCCORMICK SCH ENGN & APPL SCI, EVANSTON, IL 60208 USA. SANDIA NATL LABS, DIV THEORET, LIVERMORE, CA 94551 USA. RP SEKI, A (reprint author), NORTHWESTERN UNIV, DEPT MAT SCI & ENGN, EVANSTON, IL 60208 USA. RI Seidman, David/B-6697-2009 NR 30 TC 27 Z9 27 U1 1 U2 4 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 DEC PY 1991 VL 39 IS 12 BP 3179 EP 3185 DI 10.1016/0956-7151(91)90052-3 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA GU684 UT WOS:A1991GU68400026 ER PT J AU CHASON, JW BALDOCCHI, DD HUSTON, MA AF CHASON, JW BALDOCCHI, DD HUSTON, MA TI A COMPARISON OF DIRECT AND INDIRECT METHODS FOR ESTIMATING FOREST CANOPY LEAF-AREA SO AGRICULTURAL AND FOREST METEOROLOGY LA English DT Article ID OAK HICKORY FOREST; DIRECT SUNLIGHT; DECIDUOUS FOREST; TRANSMISSION; RADIATION; ANGLE; MODEL; INDEX AB Two indirect gap fraction methods for estimating leaf area index (LAI) are compared with estimates from litterfall collections in a mixed-age oak-hickory forest. One indirect method uses averaged, direct beam penetration data obtained with a moving tram. The second uses a portable light sensor system that measures diffuse light penetration for five sky sectors between zenith angles 0 and 75-degrees. Data were collected from September 1989 to January 1990. The Poisson model and the negative binomial model of gap frequency were applied to estimate LAI from observed transmittances. With the Poisson model, an assumption of a random leaf spatial distribution contributes to an underestimation of LAI by as much as 45%; this is because leaves at this site are actually clumped at both large and small scales. The negative binomial, which requires determination of a clumping parameter, produces estimates comparable with those of the litterfall method. Both indirect techniques accurately describe temporal changes in leaf area using either the Poisson or negative binomial model. The portable system also allows easy estimation of the spatial variation in leaf area within the site or between sites, and it can be used to obtain a vertical profile of leaf area. C1 NOAA,DIV ATMOSPHER TURBULENCE & DIFFUS,OAK RIDGE,TN 37831. RP CHASON, JW (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. RI Huston, Michael/B-1434-2009; Baldocchi, Dennis/A-1625-2009 OI Huston, Michael/0000-0001-9513-1166; Baldocchi, Dennis/0000-0003-3496-4919 NR 28 TC 167 Z9 199 U1 2 U2 33 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1923 J9 AGR FOREST METEOROL JI Agric. For. Meteorol. PD DEC PY 1991 VL 57 IS 1-3 BP 107 EP 128 DI 10.1016/0168-1923(91)90081-Z PG 22 WC Agronomy; Forestry; Meteorology & Atmospheric Sciences SC Agriculture; Forestry; Meteorology & Atmospheric Sciences GA GW144 UT WOS:A1991GW14400008 ER PT J AU BHAT, M ENGLISH, B TURHOLLOW, A AF BHAT, M ENGLISH, B TURHOLLOW, A TI BIOFUELS FROM ENERGY CROPS - ECONOMICS ENERGY-BALANCE AND CO2 EMISSIONS SO AMERICAN JOURNAL OF AGRICULTURAL ECONOMICS LA English DT Meeting Abstract C1 UNIV TENNESSEE,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,OAK RIDGE,TN. NR 0 TC 0 Z9 0 U1 0 U2 3 PU AMER AGRICULTURAL ECONOMICS ASSOC PI AMES PA 1110 BUCKEYE AVE, AMES, IA 50010-8063 SN 0002-9092 J9 AM J AGR ECON JI Am. J. Agr. Econ. PD DEC PY 1991 VL 73 IS 5 BP 1557 EP 1557 PG 1 WC Agricultural Economics & Policy; Economics SC Agriculture; Business & Economics GA HG471 UT WOS:A1991HG47100314 ER PT J AU DUNN, CP SHARITZ, RR AF DUNN, CP SHARITZ, RR TI POPULATION-STRUCTURE, BIOMASS ALLOCATION, AND PHENOTYPIC PLASTICITY IN MURDANNIA-KEISAK (COMMELINACEAE) SO AMERICAN JOURNAL OF BOTANY LA English DT Article ID REPRODUCTIVE STRATEGIES; SIZE HIERARCHIES; PLANT-POPULATIONS; COMMUNITIES; DISTURBANCE; COMPETITION; VEGETATION; LIGHT AB Field and glasshouse studies were used to explain differences in plant biomass, shoot length, and reproductive effort in four populations of a wetland annual herb, Murdannia keisak. Populations were chosen from continually thermally disturbed, intermittently thermally disturbed, revegetating, and undisturbed portions of a floodplain forest in South Carolina, USA. Plants in the two thermally disturbed areas were shorter, flowered earlier in the autumn, and produced more and smaller seeds than plants in revegetating and undisturbed sites. Reproductive effort was higher in populations from undisturbed and revegetating sites than in the two thermally disturbed sites. Generally, differences observed in the field were not expressed in the glasshouse plants. Glasshouse experiments suggested that most of the observed among-population differences in size and reproductive effort in the field study were a result of a plastic response to water depth and light. The combination of field and glasshouse data showed that this wetland weed adjusts readily to newly disturbed habitats, thus spreading rapidly and maintaining local dominance. C1 UNIV GEORGIA,DEPT BOT,ATHENS,GA 30602. UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. NR 54 TC 12 Z9 14 U1 1 U2 2 PU BOTANICAL SOC AMER INC PI COLUMBUS PA OHIO STATE UNIV-DEPT BOTANY 1735 NEIL AVE, COLUMBUS, OH 43210 SN 0002-9122 J9 AM J BOT JI Am. J. Bot. PD DEC PY 1991 VL 78 IS 12 BP 1712 EP 1723 DI 10.2307/2444850 PG 12 WC Plant Sciences SC Plant Sciences GA GY250 UT WOS:A1991GY25000010 ER PT J AU SCHWARZ, RI AF SCHWARZ, RI TI ASCORBATE STABILIZES THE DIFFERENTIATED STATE AND REDUCES THE ABILITY OF ROUS-SARCOMA VIRUS TO REPLICATE AND TO UNIFORMLY TRANSFORM CELL-CULTURES SO AMERICAN JOURNAL OF CLINICAL NUTRITION LA English DT Article; Proceedings Paper CT CONF ON ASCORBIC ACID : BIOLOGIC FUNCTIONS AND RELATION TO CANCER CY SEP 10-12, 1990 CL NIH, BETHESDA, MD SP NCI, NIDDKD HO NIH DE ASCORBATE; ROUS SARCOMA VIRUS ID AVIAN TENDON CELLS; COLLAGEN-SYNTHESIS; V-SRC; ENVIRONMENT AB In primary avian tendon cells, Rous sarcoma virus can coexist or completely take over the cell. Infection, at high multiplicity or under conditions that promote high virus production (no ascorbate and high serum concentrations), results in almost complete oncogenic transformation of the culture. This is indicated in part by a radical change in morphology, growth at high cell density, and a dramatic drop in the production of procollagen from approximately 50% to approximately 3% of total protein synthesis. In contrast, infection at low multiplicity, infection with a replication defective virus, or the presence of ascorbate restrict the ability of the virus to transform the culture. Thus, there appears to be a balance between the normal and transformed states of the cell that can be shifted depending on the cellular environment and the level of infection. Ascorbate stabilizes the normal state by reducing virus production and promoting the synthesis of differentiated proteins. RP SCHWARZ, RI (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BLDG 934,BERKELEY,CA 94720, USA. NR 14 TC 7 Z9 7 U1 0 U2 0 PU AMER SOC CLIN NUTRITION INC PI BETHESDA PA 9650 ROCKVILLE PIKE SUBSCRIPTIONS, RM L-2310, BETHESDA, MD 20814-3998 SN 0002-9165 J9 AM J CLIN NUTR JI Am. J. Clin. Nutr. PD DEC PY 1991 VL 54 IS 6 SU S BP S1247 EP S1251 PG 5 WC Nutrition & Dietetics SC Nutrition & Dietetics GA GU397 UT WOS:A1991GU39700027 ER PT J AU COMMINS, ED AF COMMINS, ED TI BERRY GEOMETRIC PHASE AND MOTIONAL FIELDS SO AMERICAN JOURNAL OF PHYSICS LA English DT Article AB An experiment is described that provides an example of how Berry's geometric phase arises from motion of a particle with a magnetic moment in an electric field and an inhomogeneous magnetic field. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP COMMINS, ED (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 8 TC 27 Z9 27 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0002-9505 J9 AM J PHYS JI Am. J. Phys. PD DEC PY 1991 VL 59 IS 12 BP 1077 EP 1080 DI 10.1119/1.16616 PG 4 WC Education, Scientific Disciplines; Physics, Multidisciplinary SC Education & Educational Research; Physics GA GQ783 UT WOS:A1991GQ78300006 ER PT J AU GALIC, H AF GALIC, H TI ALCHEMY IN 1 + 1 DIMENSION - FROM BOSONS TO FERMIONS SO AMERICAN JOURNAL OF PHYSICS LA English DT Article ID SCHWINGER MODEL; FERMIONS; SPACE AB Canonical massless fermion field is constructed from canonical boson field in 1 + 1 dimensional space. Single-fermion states are expressed in terms of eigenstates of boson operators. RP GALIC, H (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 17 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 0002-9505 J9 AM J PHYS JI Am. J. Phys. PD DEC PY 1991 VL 59 IS 12 BP 1088 EP 1096 PG 9 WC Education, Scientific Disciplines; Physics, Multidisciplinary SC Education & Educational Research; Physics GA GQ783 UT WOS:A1991GQ78300009 ER PT J AU VONDAMM, KL BISCHOFF, JL ROSENBAUER, RJ AF VONDAMM, KL BISCHOFF, JL ROSENBAUER, RJ TI QUARTZ SOLUBILITY IN HYDROTHERMAL SEAWATER - AN EXPERIMENTAL-STUDY AND EQUATION DESCRIBING QUARTZ SOLUBILITY FOR UP TO 0.5-M NACL SOLUTIONS SO AMERICAN JOURNAL OF SCIENCE LA English DT Article ID EAST PACIFIC RISE; SODIUM-CHLORIDE SOLUTIONS; DE-FUCA RIDGE; THERMODYNAMIC PROPERTIES; AQUEOUS SILICA; HIGH-PRESSURES; 21-DEGREES-N; CHEMISTRY; WATER; TEMPERATURES AB Quartz solubility in seawater was determined experimentally from 200-degrees to 450-degrees-C in the pressure range from 200 to 1000 bars. The results confirm that quartz solubility is increased in seawater relative to distilled water. The seawater data were combined with literature data on quartz solubility, primarily in distilled water, to create a data base with almost 500 points. Based on this combined data set a new equation is proposed to describe quartz solubility over the temperature range from 45-degrees to 900-degrees-C and pressure from < 1 to 9860 bars. The equation is of the form: ln m(SiO2.nH2O) = a + bln rho + (c + dT2)T-1 + ePT-1 where m = molality of dissolved silica, n = hydration number for dissolved silica, rho = density of the solution, P = pressure in bars, T = temperature in degrees-K, a = -2.32888, b = 1.79547, c = -2263.62, d = 0.00407350, and e = 0.0398808. The coefficients and terms can be shown to have a theoretical basis although the equation was empirically derived. Only the "a" term should have a dependence on the total ionic strength of this solution. This suggests that the equation may hold for ionic strengths greater than seawater (approximately 0.5 M NaCl) if corrections are made to the "a" term, which incorporates terms related to the weight fraction of H2O in the solution, and the activity coefficients for water and dissolved silica. Sufficient data are not presently available to test adequately the model at high ionic strengths. Use of this equation as a revised quartz geothermometer-geobarometer has applications for geothermal and other systems. Its application to seafloor hydrothermal solutions suggests that previously calculated depths of circulation for the fluids, based on distilled water data, were too deep by approx 0.5 km. C1 US GEOL SURVEY,PACIFIC MARINE GEOL BRANCH,MENLO PK,CA 94025. RP VONDAMM, KL (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,BLDG 1505,OAK RIDGE,TN 37831, USA. NR 58 TC 77 Z9 77 U1 0 U2 8 PU KLINE GEOLOGY LABORATORY PI NEW HAVEN PA YALE UNIV, NEW HAVEN, CT 06520 SN 0002-9599 J9 AM J SCI JI Am. J. Sci. PD DEC PY 1991 VL 291 IS 10 BP 977 EP 1007 PG 31 WC Geosciences, Multidisciplinary SC Geology GA GW359 UT WOS:A1991GW35900003 ER PT J AU FISHER, DR BADGER, CC BREITZ, H EARY, JF DURHAM, JS HUI, TE HILL, RL NELP, WB AF FISHER, DR BADGER, CC BREITZ, H EARY, JF DURHAM, JS HUI, TE HILL, RL NELP, WB TI INTERNAL RADIATION-DOSIMETRY FOR CLINICAL-TESTING OF RADIOLABELED MONOCLONAL-ANTIBODIES SO ANTIBODY IMMUNOCONJUGATES AND RADIOPHARMACEUTICALS LA English DT Article; Proceedings Paper CT 3RD CONF ON RADIOIMMUNODETECTION AND RADIOIMMUNOTHERAPY OF CANCER CY NOV 14-17, 1990 CL PRINCETON, NJ SP CTR MOLEC MED & IMMUNOL, JOHNS HOPKINS ONCOL CTR, AMER COLL RADIOL, BRISTOL MYERS SQUIBB, BURROUGHS WELLCOME, DOW CHEM, IMMUNOMEDICS, ROBERT WOOD JOHNSON PHARM RES INST, ORGANON TEKNIKA, SORIN BIOMEDICA ID LYMPHOMA AB In gauging the efficacy of radiolabeled monoclonal antibodies in cancer treatment, it is important to know the amount of radiation energy absorbed by tumors and normal tissue per unit administered activity. This paper describes methods for estimating absorbed doses to human tumors and normal tissues, including intraperitoneal tissue surfaces, red marrow, and the intestinal tract from incorporated radionuclides. These methods use the Medical Internal Radiation Dose (MIRD) scheme; however, they also incorporate enhancements designed to solve specific dosimetry problems encountered during clinical studies, such as patient-specific organ masses obtained from computerized tomography (CT) volumetrics, estimates of the dose to tumor masses within normal organs, and multicellular dosimetry for studying dose inhomogeneities in solid tumors. Realistic estimates of absorbed dose are provided within the short time requirements of physicians so that decisions can be made with regard to patient treatment and procurement of radiolabeled antibodies. Some areas in which further research could improve dose assessment are also discussed. C1 FRED HUTCHINSON CANC RES CTR, SEATTLE, WA 98104 USA. VIRGINIA MASON MED CTR, SEATTLE, WA 98101 USA. UNIV WASHINGTON, SEATTLE, WA 98195 USA. NEORX CORP, SEATTLE, WA 98119 USA. RP FISHER, DR (reprint author), PACIFIC NW LAB, POB 999,BATTELLE BLVD, RICHLAND, WA 99352 USA. NR 16 TC 26 Z9 26 U1 0 U2 0 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0892-7049 J9 ANTIBODY IMMUNOCONJ JI Antib. Immunoconjug. Radiopharm. PD WIN PY 1991 VL 4 IS 4 BP 655 EP 664 PG 10 WC Immunology; Radiology, Nuclear Medicine & Medical Imaging SC Immunology; Radiology, Nuclear Medicine & Medical Imaging GA HT510 UT WOS:A1991HT51000034 ER PT J AU SPEIDEL, MT HUMM, J BELLERIVE, MR MULKERN, R ATCHER, RW HINES, JJ MACKLIS, RM AF SPEIDEL, MT HUMM, J BELLERIVE, MR MULKERN, R ATCHER, RW HINES, JJ MACKLIS, RM TI ASSESSMENT OF DOSIMETRY AND EARLY RENAL RADIOTOXICITY AFTER TREATMENT WITH AN ALPHA-PARTICLE EMITTING RADIOPHARMACEUTICAL SO ANTIBODY IMMUNOCONJUGATES AND RADIOPHARMACEUTICALS LA English DT Article; Proceedings Paper CT 3RD CONF ON RADIOIMMUNODETECTION AND RADIOIMMUNOTHERAPY OF CANCER CY NOV 14-17, 1990 CL PRINCETON, NJ SP CTR MOLEC MED & IMMUNOL, JOHNS HOPKINS ONCOL CTR, AMER COLL RADIOL, BRISTOL MYERS SQUIBB, BURROUGHS WELLCOME, DOW CHEM, IMMUNOMEDICS, ROBERT WOOD JOHNSON PHARM RES INST, ORGANON TEKNIKA, SORIN BIOMEDICA ID METALLOTHIONEIN-LIKE PROTEINS; OVARIAN-CARCINOMA; RAT; BISMUTH; RADIOIMMUNOTHERAPY; THERAPY; BINDING; DISPOSITION; ANTIBODY; KIDNEYS AB We have analyzed the murine renal clearance kinetics, microdistribution patterns, and dosimetry of the short-lived alpha emitter Bismuth-212. This radionuclide is currently under investigation as a potential cytotoxic isotope for use in radio-immunotherapy. Since bismuth isotopes are known to be retained and cleared through the renal system it was our objective to investigate alpha particle radiation toxicity to the kidney. Groups of C57BL/6 mice were injected intraperitoneally with 1.85 x 10(6), 3.7 x 10(6) and 7.4 x 10(6) Bq of Bi-212 chelated to diethylenetriamine-pentaacetic dianhydride (DTPA). After 90 days the mice were sacrificed and their kidneys processed for histologic analysis. No significant renal damage was observed by light or electron microscopy. Biodistribution analysis and MIRD dosimetry revealed average kidney parenchymal doses of 1.408, 2.82 and 5.64 Gy/mouse kidney of alpha radiation in these groups. Phosphor plate imaging revealed significant heterogeneity in renal activity distribution patterns with the coldest and hottest regions varying by a factor of at least 10. Proton magnetic resonance studies revealed small but significant differences in T1 and T2 relaxation times for some mice, possibly indicating early damage. We conclude that Bi-212 is not significantly renotoxic at these levels, but that longer observation times may be necessary to quantify the cortical and medullary late effects indicated by magnetic resonance analysis. C1 HARVARD UNIV,BRIGHAM & WOMENS HOSP,SCH MED,DEPT RADIOL,BOSTON,MA 02115. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV BIOL,ARGONNE,IL 60439. RP SPEIDEL, MT (reprint author), HARVARD UNIV,SCH MED,DEPT RADIAT THERAPY,JOINT CTR RADIAT THERAPY,50 BINNEY ST,BOSTON,MA 02115, USA. NR 33 TC 3 Z9 3 U1 0 U2 0 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0892-7049 J9 ANTIBODY IMMUNOCONJ JI Antib. Immunoconjug. Radiopharm. PD WIN PY 1991 VL 4 IS 4 BP 681 EP 692 PG 12 WC Immunology; Radiology, Nuclear Medicine & Medical Imaging SC Immunology; Radiology, Nuclear Medicine & Medical Imaging GA HT510 UT WOS:A1991HT51000037 ER PT J AU MATTHEWS, DC APPELBAUM, FR EARY, JF HUI, TE FISHER, DR MARTIN, PJ DURACK, LD PRESS, OW BADGER, CC NELP, WB BERNSTEIN, ID AF MATTHEWS, DC APPELBAUM, FR EARY, JF HUI, TE FISHER, DR MARTIN, PJ DURACK, LD PRESS, OW BADGER, CC NELP, WB BERNSTEIN, ID TI RADIOLABELED ANTI-CD45 MONOCLONAL-ANTIBODIES TARGET HEMATOLYMPHOID TISSUE IN MURINE AND MACAQUE MODELS SO ANTIBODY IMMUNOCONJUGATES AND RADIOPHARMACEUTICALS LA English DT Article; Proceedings Paper CT 3RD CONF ON RADIOIMMUNODETECTION AND RADIOIMMUNOTHERAPY OF CANCER CY NOV 14-17, 1990 CL PRINCETON, NJ SP CTR MOLEC MED & IMMUNOL, JOHNS HOPKINS ONCOL CTR, AMER COLL RADIOL, BRISTOL MYERS SQUIBB, BURROUGHS WELLCOME, DOW CHEM, IMMUNOMEDICS, ROBERT WOOD JOHNSON PHARM RES INST, ORGANON TEKNIKA, SORIN BIOMEDICA ID ACUTE LYMPHOBLASTIC-LEUKEMIA; MARROW TRANSPLANTATION; RELAPSE; DISEASE AB We have examined the ability of radiolabeled antibody reactive with the CD45 antigen (expressed on all leukocytes, and myeloid precursors in bone marrow) to deliver radiation with relative specificity to hematolymphoid tissues in normal mice and macaques. In both species, radiolabeled anti-CD45 antibodies reached higher concentrations in lymph nodes, spleen and bone marrow than in non-hematopoietic tissues. Dosimetry estimates in macaques demonstrated the delivery of 2.2 to 2.6 fold greater radiation to bone marrow, and up to five fold greater radiation to lymph nodes, than to lung or liver. Of two antibodies of differing avidity in the macaque, the higher avidity antibody was cleared more quickly from blood and reached a lower antibody concentration in lymph nodes than did the lower avidity antibody. These studies support the use of radiolabeled anti-CD45 monoclonal antibodies, along with chemotherapy and total body irradiation, in patients undergoing bone marrow transplantation for advanced acute leukemia. A significant additional increment of radiation delivered in this way to sites of disease may lower the relapse rate with minimal additional toxicity. C1 UNIV WASHINGTON, DEPT PEDIAT, SEATTLE, WA 98105 USA. UNIV WASHINGTON, DEPT MED, SEATTLE, WA 98105 USA. UNIV WASHINGTON, DEPT RADIOL, SEATTLE, WA 98105 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP MATTHEWS, DC (reprint author), FRED HUTCHINSON CANC RES CTR, DIV CLIN RES, E-315, 1124 COLUMBIA ST, SEATTLE, WA 98104 USA. NR 21 TC 1 Z9 1 U1 0 U2 0 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0892-7049 J9 ANTIBODY IMMUNOCONJ JI Antib. Immunoconjug. Radiopharm. PD WIN PY 1991 VL 4 IS 4 BP 713 EP 719 PG 7 WC Immunology; Radiology, Nuclear Medicine & Medical Imaging SC Immunology; Radiology, Nuclear Medicine & Medical Imaging GA HT510 UT WOS:A1991HT51000040 ER PT J AU WASHBURN, LC LEE, YCC SUN, TTH BYRD, BL HOLLOWAY, EC CROOK, JE STEPLEWSKI, Z AF WASHBURN, LC LEE, YCC SUN, TTH BYRD, BL HOLLOWAY, EC CROOK, JE STEPLEWSKI, Z TI RADIOIMMUNOTHERAPY OF SW-948 HUMAN COLORECTAL-CARCINOMA XENOGRAFTS WITH REPEATED INJECTIONS OF Y-90 LABELED MONOCLONAL-ANTIBODY CO17-1A SO ANTIBODY IMMUNOCONJUGATES AND RADIOPHARMACEUTICALS LA English DT Article; Proceedings Paper CT 3RD CONF ON RADIOIMMUNODETECTION AND RADIOIMMUNOTHERAPY OF CANCER CY NOV 14-17, 1990 CL PRINCETON, NJ SP CTR MOLEC MED & IMMUNOL, JOHNS HOPKINS ONCOL CTR, AMER COLL RADIOL, BRISTOL MYERS SQUIBB, BURROUGHS WELLCOME, DOW CHEM, IMMUNOMEDICS, ROBERT WOOD JOHNSON PHARM RES INST, ORGANON TEKNIKA, SORIN BIOMEDICA ID NUDE-MICE; Y-90; THERAPY; CANCER; GROWTH AB CO17-1A, a monoclonal antibody (MoAb) with specificity for colorectal and pancreatic carcinomas, was radiolabeled with beta-emitting yttrium-90 (Y-90) site specifically via NH2-Bz-Mx-DTPA. Nude mice bearing SW 948 human colorectal carcinoma xenografts were injected intravenously with 150 or 200-mu-Ci of HPLC-purified Y-90-CO17-1A/25 g body weight. Unlabeled CO17-IA (100-mu-g/25 g) was coadministered. Controls received only unlabeled CO17-1A. After 49 and 125 days, the animals receiving 200-mu-Ci/25 g were reinjected at dosages of 150-mu-Ci/25 g. No deaths resulted from either treatment. The reduction in the initial tumor size reached nadirs of 96.3% at 39 days, 88.4% at 74 days, and 43.6% at 147 days. The animals receiving 156-mu-Ci/25 g, after reaching a maximum reduction in the initial tumor size of 84.6% at 21 days, were reinjected with 200-mu-Ci/25 g at 49 days after the first injection, but all died 17-21 days later. Controls were sacrificed at 109 days after an increase in the initial tumor size of 11,400%. In conclusion, the tumor burden in nude mice bearing SW 948 human colorectal carcinoma xenografts can be kept manageable by repeated intravenous injections of Y-90-CO17-1A, but the dosages administered and the sequence and timing of administration are critical for optimal therapeutic efficacy and safety. C1 OAK RIDGE ASSOCIATED UNIV,DIV MED SCI,OAK RIDGE,TN 37831. WISTAR INST,PHILADELPHIA,PA 19104. NR 20 TC 3 Z9 3 U1 0 U2 2 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0892-7049 J9 ANTIBODY IMMUNOCONJ JI Antib. Immunoconjug. Radiopharm. PD WIN PY 1991 VL 4 IS 4 BP 729 EP 734 PG 6 WC Immunology; Radiology, Nuclear Medicine & Medical Imaging SC Immunology; Radiology, Nuclear Medicine & Medical Imaging GA HT510 UT WOS:A1991HT51000042 ER PT J AU BERNSTEIN, ID PRESS, OW EARY, JF APPELBAUM, FR BADGER, CC MATTHEWS, DC FISHER, DR MARTIN, PJ DURACK, L LEVY, R MILLER, R KROHN, K NELP, WB THOMAS, ED AF BERNSTEIN, ID PRESS, OW EARY, JF APPELBAUM, FR BADGER, CC MATTHEWS, DC FISHER, DR MARTIN, PJ DURACK, L LEVY, R MILLER, R KROHN, K NELP, WB THOMAS, ED TI TREATMENT OF LEUKEMIA AND LYMPHOMA USING ANTIBODY LABELED WITH HIGH-DOSES OF I-131 SO ANTIBODY IMMUNOCONJUGATES AND RADIOPHARMACEUTICALS LA English DT Article; Proceedings Paper CT 3RD CONF ON RADIOIMMUNODETECTION AND RADIOIMMUNOTHERAPY OF CANCER CY NOV 14-17, 1990 CL PRINCETON, NJ SP CTR MOLEC MED & IMMUNOL, JOHNS HOPKINS ONCOL CTR, AMER COLL RADIOL, BRISTOL MYERS SQUIBB, BURROUGHS WELLCOME, DOW CHEM, IMMUNOMEDICS, ROBERT WOOD JOHNSON PHARM RES INST, ORGANON TEKNIKA, SORIN BIOMEDICA ID NON-HODGKINS LYMPHOMA; MARROW TRANSPLANTATION; MONOCLONAL-ANTIBODY; CELL LYMPHOMA; IMMUNOGLOBULIN AB Although the use of radiolabeled antibodies has led to objective responses in the treatment of patients with hematologic malignancies, it has not been possible to deliver curative doses of radiation to these patients due to myelosuppression. We have, however, initiated studies using radiolabeled antibodies in combination with autologous or allogeneic bone marrow transplantation in an attempt to deliver higher, potentially curative, doses of radiation to patients with leukemia or lymphoma. In studies of lymphoma we have initiated a Phase I trial of high-dose I-131-labeled antibodies against B-cell associated antigens. In 13 of 27 patients in whom we studied the biodistribution of trace-labeled antibody, the antibody delivered greater estimated absorbed doses of radiation to tumor as compared to liver, lung or kidney ("favorable biodistribution"). This favorable biodistribution was found only in patients with a relatively small tumor burden. Eleven patients received therapeutic amounts of I-131-labeled antibody. All patients responded, with nine patients achieving complete remissions lasting 4 to 29 + months. All patients experienced myelosuppression and seven received an infusion of autologous marrow cells. We have not yet observed significant toxicity in non-hematopoietic organs following delivery of up to estimated doses of 2025 rads to lung, liver, or kidney, suggesting that future radiation doses may be substantially escalated. In studies of leukemia, patients receive radiolabeled antibody followed by high dose cyclophosphamide and 1200 rads total body irradiation with autologous or allogeneic bone marrow transplantation. Using an anti-CD33 antibody labeled with trace amounts of I-131, 3 patients were estimated to receive greater estimated absorbed doses to marrow compared to lung, liver or kidney. These patients were treated with the antibody labeled with an amount of I-131 calculated to deliver estimated absorbed doses of 175 rads to normal organs and greater amounts to marrow. No unexpected toxicity has occurred and engraftment has been prompt. Dose escalation studies are proceeding. C1 UNIV WASHINGTON, DEPT PEDIAT, SEATTLE, WA 98105 USA. UNIV WASHINGTON, DEPT MED, SEATTLE, WA 98105 USA. UNIV WASHINGTON, DEPT RADIOL, SEATTLE, WA 98105 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. STANFORD UNIV, MED CTR, DEPT MED, STANFORD, CA 94305 USA. IDEC PHARMACEUT CORP, MT VIEW, CA 94043 USA. RP BERNSTEIN, ID (reprint author), FRED HUTCHINSON CANC RES CTR, DIV CLIN RES, 1124 COLUMBIA ST, SEATTLE, WA 98104 USA. NR 14 TC 4 Z9 4 U1 0 U2 0 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0892-7049 J9 ANTIBODY IMMUNOCONJ JI Antib. Immunoconjug. Radiopharm. PD WIN PY 1991 VL 4 IS 4 BP 771 EP 776 PG 6 WC Immunology; Radiology, Nuclear Medicine & Medical Imaging SC Immunology; Radiology, Nuclear Medicine & Medical Imaging GA HT510 UT WOS:A1991HT51000047 ER PT J AU DENARDO, GL DENARDO, SJ MEARES, CF KUKIS, D DIRIL, H MCCALL, MJ ADAMS, GP MAUSNER, LF MOODY, DC DESHPANDE, SV AF DENARDO, GL DENARDO, SJ MEARES, CF KUKIS, D DIRIL, H MCCALL, MJ ADAMS, GP MAUSNER, LF MOODY, DC DESHPANDE, SV TI PHARMACOKINETICS OF COPPER-67 CONJUGATED LYM-1, A POTENTIAL THERAPEUTIC RADIOIMMUNOCONJUGATE, IN MICE AND IN PATIENTS WITH LYMPHOMA SO ANTIBODY IMMUNOCONJUGATES AND RADIOPHARMACEUTICALS LA English DT Article; Proceedings Paper CT 3RD CONF ON RADIOIMMUNODETECTION AND RADIOIMMUNOTHERAPY OF CANCER CY NOV 14-17, 1990 CL PRINCETON, NJ SP CTR MOLEC MED & IMMUNOL, JOHNS HOPKINS ONCOL CTR, AMER COLL RADIOL, BRISTOL MYERS SQUIBB, BURROUGHS WELLCOME, DOW CHEM, IMMUNOMEDICS, ROBERT WOOD JOHNSON PHARM RES INST, ORGANON TEKNIKA, SORIN BIOMEDICA ID BIFUNCTIONAL CHELATING AGENT; MONOCLONAL-ANTIBODIES; METAL-IONS; RADIOPHARMACEUTICALS; RADIOIMMUNOTHERAPY; BIODISTRIBUTION; CANCER; EDTA AB The macrocyclic chelate TETA was developed and synthesized to prepare a stable radioimmunoconjugate of copper-67 (Cu-67) . Lym-1 chelate labeled with bromoacetylamidobenzyl TETA and Cu-67 (Cu-67-BAT-Lym-1) was found to be stable in physiologic milieu and in nude mice implanted with human lymphoma. in addition, Cu-67-BAT-Lym-1 was found to have properties in patients with lymphoma that suggest it to be attractive for radioimmunotherapy, C1 UNIV CALIF DAVIS,SACRAMENTO MED CTR,DEPT INTERNAL MED,SACRAMENTO,CA 95817. UNIV CALIF DAVIS,SACRAMENTO MED CTR,DEPT RADIOL,SACRAMENTO,CA 95817. UNIV CALIF DAVIS,SACRAMENTO MED CTR,DEPT PATHOL,SACRAMENTO,CA 95817. UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RI Meares, Claude/A-8345-2011 NR 27 TC 49 Z9 49 U1 0 U2 0 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0892-7049 J9 ANTIBODY IMMUNOCONJ JI Antib. Immunoconjug. Radiopharm. PD WIN PY 1991 VL 4 IS 4 BP 777 EP 785 PG 9 WC Immunology; Radiology, Nuclear Medicine & Medical Imaging SC Immunology; Radiology, Nuclear Medicine & Medical Imaging GA HT510 UT WOS:A1991HT51000048 ER PT J AU VARINEAU, PT DUESING, R WANGEN, LE AF VARINEAU, PT DUESING, R WANGEN, LE TI DETERMINATION OF URANYL IN AQUEOUS-SOLUTIONS USING A FIBER-OPTIC-BASED, TIME-RESOLVED LUMINESCENCE SENSOR SO APPLIED SPECTROSCOPY LA English DT Article DE URANYL; URANIUM; LUMINESCENCE, FIBER OPTICS; SENSORS; OPTRODE; FLOW ID ELECTRON-TRANSFER MECHANISM; METAL-IONS; EXCHANGE MEMBRANE; ULTRATRACE LEVELS; TRACE AMOUNTS; LASER; URANIUM; FLUOROMETER; LIFETIMES; DIFFUSION AB The use of time-resolved luminescence measurements is an effective way to determine a wide range of uranyl concentrations in aqueous samples. We have coupled this technique with the use of a remote optical sensing device, a "flow optrode," by using fiber-optic cables in order to probe for uranyl in aqueous solutions. The flow optrode incorporates a Nafion membrane through which UO22+ can diffuse into a reaction/analysis chamber which contains phosphoric acid, a reagent which enhances the uranyl luminescence intensity and excited-state lifetime. The excited-state lifetime measurement provides information on the chemical environment within the sensor. Anionic quenchers are prohibited from entering the analysis cell because they cannot diffuse through the membrane. Fluorescing organic interferences can be eliminated by analyzing the emission signal at several microseconds after laser excitation. We were able to determine uranyl over a concentration range of 10(-4) to 10(-9) M using the flow optrode sensor. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV CHEM & LASER SCI,MAIL STOP G740,LOS ALAMOS,NM 87545. NR 40 TC 21 Z9 21 U1 1 U2 6 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 201B BROADWAY ST, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD DEC PY 1991 VL 45 IS 10 BP 1652 EP 1655 DI 10.1366/0003702914335247 PG 4 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA GY975 UT WOS:A1991GY97500014 ER PT J AU BROWN, MS STEEPER, RR AF BROWN, MS STEEPER, RR TI CO2-BASED THERMOMETRY OF SUPERCRITICAL WATER OXIDATION SO APPLIED SPECTROSCOPY LA English DT Article DE THERMOMETRY; SUPERCRITICAL FLUIDS; RAMAN SPECTROSCOPY ID STIMULATED RAMAN-SPECTROSCOPY; NU-1/2-NU-2 FERMI DYAD; CARBON-DIOXIDE; HIGH-PRESSURES; BAND SHAPES; LIQUID H2O; CO2 GAS; SPECTRA; FLAMES; TEMPERATURES AB We have demonstrated the suitability of CO2 Raman spectra as a thermometric probe of the fluid mixtures encountered in supercritical water oxidation. Measured temperature accuracies of +/- 6% are presented. Measurements were made of the upsilon-1, 2-upsilon-2 Fermi resonance features of CO2 in a supercritical water environment. Over the temperature range of interest to researchers of supercritical water oxidation, approximately 400-650-degrees-C, hot bands appear in the Raman spectrum of CO2 with sufficient spectral intensity to serve as a convenient measure of the fluid temperature. We have analyzed these hot bands by taking the ratio of their integrated intensity with the integrated intensity of the fundamental. Over the temperature range of 390 to 540-degrees-C, the intensity ratio of the first pure hot band feature to the fundamental of upsilon-1 shows a very nearly linear dependence on temperature. The experimental ratio measurements are well explained by standard Raman theory if the Fermi resonance is accounted for. As discussed, the CO2 spectral line shape is affected by the high pressure (P > 22.1 MPa) used in supercritical work, but these changes do not affect the extraction of a fluid temperature from the spectra. RP BROWN, MS (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. NR 26 TC 11 Z9 11 U1 0 U2 5 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA 201B BROADWAY ST, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD DEC PY 1991 VL 45 IS 10 BP 1733 EP 1738 DI 10.1366/0003702914335319 PG 6 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA GY975 UT WOS:A1991GY97500026 ER PT J AU LEE, SY KIM, SS SWEET, RM SUH, SW AF LEE, SY KIM, SS SWEET, RM SUH, SW TI CRYSTALLIZATION AND A PRELIMINARY-X-RAY CRYSTALLOGRAPHIC STUDY OF ALPHA-AMYLASE FROM BACILLUS-LICHENIFORMIS SO ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS LA English DT Article ID DIFFRACTION; RESOLUTION; DETECTOR; CALCIUM C1 LUCKY RES & DEV CTR,TAEJON,SOUTH KOREA. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RP LEE, SY (reprint author), SEOUL NATL UNIV,COLL NAT SCI,DEPT CHEM,SEOUL 151742,SOUTH KOREA. RI Suh, Se Won/H-8306-2013 OI Suh, Se Won/0000-0002-1768-4635 NR 21 TC 10 Z9 10 U1 0 U2 5 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-9861 J9 ARCH BIOCHEM BIOPHYS JI Arch. Biochem. Biophys. PD DEC PY 1991 VL 291 IS 2 BP 255 EP 257 DI 10.1016/0003-9861(91)90131-2 PG 3 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA GQ027 UT WOS:A1991GQ02700008 PM 1952938 ER PT J AU BLANCO, A BUSSOLETTI, E COLANGELI, L FONTI, S STEPHENS, JR AF BLANCO, A BUSSOLETTI, E COLANGELI, L FONTI, S STEPHENS, JR TI HYDROGENATED AMORPHOUS-CARBON GRAINS AND THE 2175-A INTERSTELLAR HUMP SO ASTROPHYSICAL JOURNAL LA English DT Article DE INTERSTELLAR, GRAINS; LABORATORY, SPECTRA; ULTRAVIOLET, SPECTRA ID EXTINCTION; RANGE; PARTICLES; STARS; FILMS AB In this paper we present the first extinction spectra of carbon grains condensed in a hydrogen atmosphere to simulate the formation of dust particles in hydrogen-rich astrophysical environments. In order to assess the influence of hydrogen during grain formation unambiguously, experiments were performed in hydrogen-poor (Ar) and hydrogen-rich (H-2) atmospheres allowing the carbon vapor to condense homogeneously into grains. The experimental data confirm the theoretical predictions on the lack of any feature in the ultraviolet spectra of fully hydrogenated amorphous carbon grains and clearly show the relevance of the different atmospheres during the condensation process. Our results support the idea that grains observed in the interstellar medium, which show a strong 2175 angstrom feature, have undergone some processing subsequent to their formation. C1 IST UNIV NAVALE,I-80133 NAPLES,ITALY. UNIV CASSINO,DIPARTIMENTO INGN IND,I-03043 CASSINO,ITALY. OSSERV ASTRON CAPODIMONTE,NAPLES,ITALY. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP BLANCO, A (reprint author), UNIV LECCE,DEPT PHYS,CP 193,I-73100 LECCE,ITALY. NR 16 TC 20 Z9 20 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 DEC 1 PY 1991 VL 382 IS 2 BP L97 EP L99 DI 10.1086/186221 PN 2 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GR014 UT WOS:A1991GR01400010 ER PT J AU SANO, T CANTOR, CR AF SANO, T CANTOR, CR TI A STREPTAVIDIN-PROTEIN-A CHIMERA THAT ALLOWS ONE-STEP PRODUCTION OF A VARIETY OF SPECIFIC ANTIBODY CONJUGATES SO BIO-TECHNOLOGY LA English DT Article ID ESCHERICHIA-COLI; BINDING; EXPRESSION; GENE AB We have expressed a gene fusion of streptavidin and the two immunoglobulin G (IgG)-binding domains of protein A in Escherichia coli. The purified chimeric protein had full biotin-binding ability, and bound one IgG molecule per subunit (31.4 kD). The affinity of the chimeric protein both for biotin and IgG can be used to provide antibody molecules with additional recognition capabilities. For example, the chimera will allow any IgG molecule to be used for sensitive biotin-linked detection systems without the need for chemical modification. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM BIODYNAM,BERKELEY,CA 94720. RP SANO, T (reprint author), UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720, USA. FU NCI NIH HHS [CA39782] NR 28 TC 52 Z9 55 U1 0 U2 3 PU NATURE PUBLISHING CO PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 SN 0733-222X J9 BIO-TECHNOL JI Bio-Technology PD DEC PY 1991 VL 9 IS 12 BP 1378 EP 1381 DI 10.1038/nbt1291-1378 PG 4 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA HA472 UT WOS:A1991HA47200021 PM 1367770 ER PT J AU OBRIEN, JJ KUMARI, SS SKINNER, DM AF OBRIEN, JJ KUMARI, SS SKINNER, DM TI PROTEINS OF CRUSTACEAN EXOSKELETONS .1. SIMILARITIES AND DIFFERENCES AMONG PROTEINS OF THE 4 EXOSKELETAL LAYERS OF 4 BRACHYURANS SO BIOLOGICAL BULLETIN LA English DT Article ID RESOLUTION 2-DIMENSIONAL ELECTROPHORESIS; CRAYFISH ASTACUS-LEPTODACTYLUS; DIFFERENT ANATOMICAL REGIONS; POST-EMBRYONIC DEVELOPMENT; CRAB GECARCINUS-LATERALIS; CUTICULAR PROTEINS; HYALOPHORA-CECROPIA; TOBACCO HORNWORM; MANDUCA-SEXTA; POLYACRYLAMIDE GELS AB Most of the proteins extracted from exocuticle, endocuticle, and membranous layer of four species of anecdysial (intermolt) crabs (the Bermuda land crab Gecarcinus lateralis, the rock crab Cancer antennarius, the shield-backed kelp crab Pugettia producta, and the southern shield-backed kelp crab Taliepus nuttalli) were 31 kDa or smaller; proteins of similar M(r) were common to all three layers. Proteins from the membranous layer were qualitatively indistinguishable in all four species. More proteins 31 kDa or smaller were similar in size and pl to proteins from other exoskeletal layers than were proteins larger than 31 kDa. Proteins extracted from the epicuticle of G. lateralis included a group of five ranging from 54 to 42 kDa that bound Ca-45++ in vitro. The group was not seen in other layers of the exoskeleton of G. lateralis or, with the exception of 44 and 42 kDa protein bands that were in the epicuticle of C. antennarius, in any layers of the exoskeletons of the other three species. During proecdysis, the membranous layer is completely degraded, and proteins 31 kDa or smaller are preferentially degraded from the exocuticle and endocuticle of the old exoskeleton of G. lateralis, which is cast as an exuvia at ecdysis. The relative amounts of proteins in extracts of epicuticle from (1) anecdysial exoskeletons and (2) exuviae were very similar, suggesting that there was little degradation of epicuticle during proecdysis. Some of the proteins of the three inner layers of the exoskeleton of G. lateralis have characteristics similar to those of flexible cuticles of insects; they have acidic pIs and they form ''charge trains,'' i.e., proteins of the same size separated by differences in charge during isoelectric focusing. C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. E TENNESSEE STATE UNIV,JOHNSON CITY,TN 37614. NR 69 TC 29 Z9 29 U1 0 U2 2 PU MARINE BIOLOGICAL LABORATORY PI WOODS HOLE PA BIOLOGICAL BULL MBL STREET, WOODS HOLE, MA 02543 SN 0006-3185 J9 BIOL BULL JI Biol. Bull. PD DEC PY 1991 VL 181 IS 3 BP 427 EP 441 DI 10.2307/1542363 PG 15 WC Biology; Marine & Freshwater Biology SC Life Sciences & Biomedicine - Other Topics; Marine & Freshwater Biology GA LA252 UT WOS:A1991LA25200008 ER PT J AU TAYLOR, SR RAMBO, JT SWIFT, RP AF TAYLOR, SR RAMBO, JT SWIFT, RP TI NEAR-SOURCE EFFECTS ON REGIONAL SEISMOGRAMS - AN ANALYSIS OF THE NTS EXPLOSIONS PERA AND QUESO SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Article ID WESTERN UNITED-STATES; SURFACE-WAVES; DISCRIMINATION; EARTHQUAKES; SPALL; WAVEFORMS; YIELD AB A comparative analysis of two closely spaced Nevada Test Site explosions, PERA and QUESO, is made to study the effects of near-source phenomena on regional-wave excitation. Although the two explosions were of similar size, burial depth, and only separated by 4 km, the 1 to 2 and 6 to 8 Hz regional-wave spectral ratio for QUESO is anomalously low (a factor of 10 smaller than that of PERA). Examination of the regional and close-in spectra for each event shows a remarkable similarity and suggests that QUESO has less low-frequency and more high-frequency energy than PERA. These observations may be caused by a 564 m3, funnel-shaped region filled with unconsolidated sand and a possible void directly above the QUESO detonation point. Close-in observations suggest that this region may have partially decoupled the up-going energy from QUESO, resulting in a reduction. of the low-frequency energy. The high-frequency enhancement for QUESO may be due to the rapid loss of energy to nonlinear effects such as greater pore collapse and fracturing in the anomalous region. This resulted in the radiation of more impulsive, shorter-duration waveforms producing a higher corner frequency and less-rapid high-frequency spectral decay for QUESO. For PERA, the loss of energy to a two-wave system occurred more slowly and over a larger volume, resulting in a broader source pulse typical of explosions in porous materials. Comparison of shock radius versus time data suggests that the shock wave was strongly affected in the anomalous zone a few meters above the QUESO device. One-dimensional finite-difference calculations with and without a partial decoupling region within 8 m of the device are consistent with the observations. Although spallation was reduced for QUESO, simulations using a finite spall model indicate that the spall spectral peak should be centered at about 3 to 7 Hz and probably did not significantly contribute to the reduced spectral ratio. The remarkable similarity of the PERA/QUESO spectral ratios taken at distances of 90 m and 400 km suggests that the spectral characteristics of explosions are established in close proximity to the source. Although depth-dependent effects of attenuation acting at small strains may enhance the differences in spectral ratios between NTS explosions and western U.S. earthquakes, these effects are probably secondary to the high-pressure, high strain-rate dynamic material response to the radiated explosion shock wave. These observations point out the importance of up-going energy on the generation of regional phases from explosions. Because of reduced overburden pressures above the detonation point, large nonlinear deformations predominate in this region and appear to affect all of the signals except perhaps the very initial part of the Pn waveform. RP TAYLOR, SR (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,LIVERMORE,CA 94550, USA. NR 27 TC 3 Z9 3 U1 1 U2 1 PU SEISMOLOGICAL SOC AMER PI EL CERRITO PA PLAZA PROFESSIONAL BLDG, SUITE 201, EL CERRITO, CA 94530 SN 0037-1106 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD DEC PY 1991 VL 81 IS 6 BP 2371 EP 2394 PG 24 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA GV781 UT WOS:A1991GV78100013 ER PT J AU HARRIS, DB AF HARRIS, DB TI A WAVE-FORM CORRELATION METHOD FOR IDENTIFYING QUARRY EXPLOSIONS SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Article ID SMALL EARTHQUAKES; HETEROGENEITY; AFTERSHOCKS; CALIFORNIA AB A waveform correlation method is presented for identifying quarry explosions by attributing them to known mines characterized by multiple master events. The objective is to provide a reliable automatic procedure for screening the large number of quarry explosions likely to be detected by networks of in-country stations monitoring compliance with test-ban treaties. The method generalizes existing correlation techniques to compare waveforms from an unlocated event recorded at an array of sensors with a linear combination of master event waveforms recorded at the same array. The use of a linear combination reduces the chance of a missed location caused by some variation in mechanism or spectral excitation between the events being compared. The weights in the linear combination are filters, offering some compensation for variations in source time functions and errors of waveform alignment. The use of array data reduces the likelihood of false attribution by reducing bias and variance in the correlation measurement. In a test conducted with P-wave data segments recorded at a 13-element array, the method successfully resolves two source regions separated by 4 km at a range of 150 km. Resolution with single-station waveform correlations is marginal due to the limited amount of data. The statistics of the sample waveform correlation coefficient are developed and demonstrate that single-station waveform correlations are unreliable unless estimated with large signal durations T or bandwidths B. A time-bandwidth TB product exceeding 100 (or smaller TB with more stations) is necessary for reliable event attribution. The related problem of separating superimposed waveforms from two events in different source regions may be solved by cancellation. The waveforms of one event are again approximated by a linear combination of waveforms from master events in the same mine. The residual signals, obtained by subtracting the approximation from the superimposed waveforms, estimate the waveforms from the second event. This method achieves significant separation of waveforms from events 6 km apart at a range of 150 km, using data from the 13-element array. Its resolution exceeds that of conventional beam-forming methods. RP HARRIS, DB (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,L-205,LIVERMORE,CA 94550, USA. NR 20 TC 58 Z9 58 U1 0 U2 1 PU SEISMOLOGICAL SOC AMER PI EL CERRITO PA PLAZA PROFESSIONAL BLDG, SUITE 201, EL CERRITO, CA 94530 SN 0037-1106 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD DEC PY 1991 VL 81 IS 6 BP 2395 EP 2418 PG 24 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA GV781 UT WOS:A1991GV78100014 ER PT J AU PUTZ, FE SHARITZ, RR AF PUTZ, FE SHARITZ, RR TI HURRICANE DAMAGE TO OLD-GROWTH FOREST IN CONGAREE SWAMP NATIONAL MONUMENT, SOUTH-CAROLINA, USA SO CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE LA English DT Article ID PRODUCTIVITY; DISTURBANCE; MAINTENANCE; SUCCESSION AB Hurricane Hugo caused much damage to the old-growth forests of the Congaree Swamp National Monument, but most of the damage to trees > 20 cm dbh consisted of crown breakage and defoliation. Serious damage (> 25% of crown lost, snapped trunk, or uprooted) was more common in mixed bottomland forest (49% of trees seriously damaged) than in adjacent sloughs dominated by Taxodium distichum (L.) L.C. Rich. and Nyssa aquatica L. (19% of trees seriously damaged). Of the trees > 20 cm dbh, about 12% were uprooted in the bottomland forest, whereas only 2% were uprooted in sloughs. The storm reduced diversity in sloughs because most trees of species characteristic of better drained sites, and especially those rooted on nurse logs and other unstable elevated microsites, were uprooted. Dynamics of the entire forest were greatly influenced by the capacity of most tree species to recover vegetatively after suffering even severe crown and stem damage. Trees with resprouted crowns, however, were particularly likely to be broken, presumably owing to the presence of stem rots and architecturally unsound branching patterns. C1 SAVANNAH RIVER ECOL LAB,AIKEN,SC 29809. RP PUTZ, FE (reprint author), UNIV FLORIDA,DEPT BOT,GAINESVILLE,FL 32611, USA. NR 21 TC 106 Z9 111 U1 0 U2 18 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0045-5067 J9 CAN J FOREST RES JI Can. J. For. Res.-Rev. Can. Rech. For. PD DEC PY 1991 VL 21 IS 12 BP 1765 EP 1770 DI 10.1139/x91-244 PG 6 WC Forestry SC Forestry GA GW451 UT WOS:A1991GW45100009 ER PT J AU WATKINS, BE SUZUKI, M WALLIN, H WAKABAYASHI, K ALEXANDER, J VANDERLAAN, M SUGIMURA, T ESUMI, H AF WATKINS, BE SUZUKI, M WALLIN, H WAKABAYASHI, K ALEXANDER, J VANDERLAAN, M SUGIMURA, T ESUMI, H TI THE EFFECT OF DOSE AND ENZYME INDUCERS ON THE METABOLISM OF 2-AMINO-1-METHYL-6-PHENYLIMIDAZO[4,5-B]PYRIDINE (PHIP) IN RATS SO CARCINOGENESIS LA English DT Article ID FOOD MUTAGEN 2-AMINO-1-METHYL-6-PHENYLIMIDAZO<4,5-B>PYRIDINE; 2-AMINO-3-METHYLIMIDAZO<4,5-F>QUINOLINE; CARCINOGENICITY; GLUCURONIDATION; GENOTOXICITY; ACTIVATION; INDUCTION; TUMORS; ACID AB Male Fischer 344 rats were given a single dose of 0.03-30 mg/kg of [2-C-14]2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine ([C-14]PhIP), the radioactivity in urine and feces was determined over 48 h, and the major metabolites were identified and quantified. Dose had little effect on the profile of metabolites in the urine but did influence the profile in the feces. PhIP was more efficiently metabolized at higher doses. In addition, rats were pretreated with Aroclor 1254 (PCB), 3-methylcholanthrene (MC), phenobarbital (PB), PhIP and corn oil prior to a single dose of [C-14]PhIP, and compared with a control group receiving [C-14]PhIP only. The major metabolites in the urine and feces were quantitated for each group, as well as PhIP binding to serum proteins, hemoglobin and selected tissues. Pretreatment with MC and PCB resulted in an increase in the amount of 4'-hydroxylation of PhIP and a decrease in the amount of N-hydroxylated metabolites in the urine. Pretreatment with PB resulted in an increase in the amount of N-hydroxylated metabolites, but a decrease in 4'-hydroxylation. Pretreatment with either MC or PCB resulted in an increase in PhIP binding to the liver and kidney, while reducing the binding in other tissues. Animals pretreated with PhIP showed few significant differences from the untreated group, while pretreatment with PB in general resulted in a decrease of PhIP binding in tissues. C1 NATL CANC CTR,RES INST,DIV BIOCHEM,TSUKIJI 5-CHROME,CHUO KU,TOKYO 104,JAPAN. NATL CANC CTR,RES INST,DIV CARCINOGENESIS,CHUO KU,TOKYO 104,JAPAN. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV CHEM SCI,LIVERMORE,CA 94550. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. NATL INST PUBL HLTH,DEPT ENVIRONM MED,N-4062 OSLO,NORWAY. RP ESUMI, H (reprint author), NATL CANC CTR,RES INST,DIV BIOCHEM,TSUKIJI 5-CHROME,CHUO KU,TOKYO 104,JAPAN. RI Wallin, Hakan/I-6459-2012 OI Wallin, Hakan/0000-0001-7716-0166 FU NCI NIH HHS [R01 CA48446-1] NR 24 TC 34 Z9 34 U1 0 U2 0 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0143-3334 J9 CARCINOGENESIS JI Carcinogenesis PD DEC PY 1991 VL 12 IS 12 BP 2291 EP 2295 DI 10.1093/carcin/12.12.2291 PG 5 WC Oncology SC Oncology GA GV518 UT WOS:A1991GV51800015 PM 1747929 ER PT J AU AMBROSIANO, JJ GEARY, JL AF AMBROSIANO, JJ GEARY, JL TI A ONE-DIMENSIONAL PIC-CIRCUIT CODE FOR SIMULATING A REFLEX TRIODE SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article ID DIODES AB We describe a computer model capable of simulating an idealized one-dimensional reflex triode. Charged particle motion and electron scattering by a thin foil are calculated self-consistently with the response of an external circuit. The code has many potential applications in pulse power physics. We describe the model in detail and give a computational example. Our test case follows the evolution to a low-impedance steady state of a reflex triode driven symmetrically by a capacitive discharge. C1 BERKELEY RES ASSOCIATES INC,SPRINGFIELD,VA 22150. RP AMBROSIANO, JJ (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 29 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0010-4655 J9 COMPUT PHYS COMMUN JI Comput. Phys. Commun. PD DEC PY 1991 VL 67 IS 2 BP 210 EP 222 DI 10.1016/0010-4655(91)90017-F PG 13 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA GV588 UT WOS:A1991GV58800004 ER PT J AU ADVANI, AH MURR, LE ATTERIDGE, DG CHELAKARA, R BRUEMMER, SM AF ADVANI, AH MURR, LE ATTERIDGE, DG CHELAKARA, R BRUEMMER, SM TI DEFORMATION EFFECTS ON INTRAGRANULAR CARBIDE PRECIPITATION AND TRANSGRANULAR CHROMIUM DEPLETION IN TYPE-316 STAINLESS-STEELS SO CORROSION LA English DT Article DE CARBIDES; CHROMIUM-DEPLETION DEFORMATION; SENSITIZATION; STAINLESS STEEL; TRANSGRANULAR CORROSION ID PRIOR COLD WORK; ELECTRON-MICROSCOPE; SENSITIZATION; STRAIN; EVOLUTION AB Grain matrix or transgranular (TG) chromium depletion in type 316 stainless steels (SS) has been observed to be strain and heat treatment dependent, yielding C-curve behavior on a time-temperature-strain-TG corrosion map. The strain effect dominates above 16 to 20 percent showing increased TG corrosion and decreased time to develop TG depletion with increasing strain level. Higher temperatures also reduce the time to develop grain matrix attack, while isothermal holding for longer times produces higher amounts of TG corrosion in SS. Transgranular depletion is caused by precipitation of carbides within grain-matrix regions. Specifically, defect sites created during straining are favored locations for intragranular precipitation in SS. Regions of high dislocation density, deformation twin-stacking fault planes and twin-fault intersections were identified to be preferred sites for grain matrix precipitation during transmission electron microscopy (TEM) of 16 to 35 percent deformed SS. C1 OREGON GRAD INST, BEAVERTON, OR 97006 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. UNIV TEXAS, DEPT MET & MAT ENGN, EL PASO, TX 79968 USA. UNIV TEXAS, AUSTIN, TX 78712 USA. RP ADVANI, AH (reprint author), UNIV TEXAS, INST MFG & MAT MANAGEMENT, EL PASO, TX 79968 USA. OI Murr, Lawrence/0000-0001-5942-8376 NR 42 TC 10 Z9 11 U1 0 U2 3 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0010-9312 J9 CORROSION JI Corrosion PD DEC PY 1991 VL 47 IS 12 BP 939 EP 947 PG 9 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HN729 UT WOS:A1991HN72900003 ER PT J AU VOLPE, AM HAMMOND, PE AF VOLPE, AM HAMMOND, PE TI U-238 TH-230-RA-226 DISEQUILIBRIA IN YOUNG MOUNT ST-HELENS ROCKS - TIME CONSTRAINT FOR MAGMA FORMATION AND CRYSTALLIZATION SO EARTH AND PLANETARY SCIENCE LETTERS LA English DT Article ID VOLCANIC-ROCKS; TH-230-U-238 DISEQUILIBRIUM; RADIOACTIVE DISEQUILIBRIA; PLAGIOCLASE PHENOCRYSTS; MASS-SPECTROMETRY; TH; SYSTEMATICS; EVOLUTION; SERIES; FRACTIONATION AB We use U-238-series nuclides and Th-230/Th-232 Th ratios measured by mass spectrometry to constrain processes and time scales of calc-alkaline magma genesis at Mount St. Helens, Washington. Olivine basalt, pyroxene andesites and dacites that erupted 10-2 ka ago show 3-14% (Th-230)-(U-238) and 6-54% Ra-226-Th-230 disequilibria. Mineral phases exhibit robust (Ra-226)-(Th-230) fractionation. Plagioclase has large 65-280% (Ra-226) excesses, and magnetite has large 65% (Ra-226) deficits relative to (Th-230). Calculated partition coefficients for Ba, Th, and U in mineral-groundmass pairs, except Ba in plagioclase, are low (less-than-or-equal-to 0.04). Correlation between (Ra-226/Th-230) activity ratios and Ba/Th element ratios in the minerals suggests that Ra-226 partitions similar to Ba during crystallization. Internal (Th-230)-(U-238) isochrons for 1982 summit and East Dome dacites and Goat Rocks and Kalama andesites show that closed Th-U system fractionation occurred 2-6 ka ago. Apparent internal isochrons for Castle Creek basalt (34 ka) and andesite (27 ka) suggest longer magma chamber residence times and mixing of old crystals and young melt. Mineral (Ra-226)-(Th-230) disequilibrium on Ba-normalized internal isochron diagrams suggests average magma chamber residence times of 500-3000 years. In addition, radioactive (Ra-226/Th-230) heterogeneity between minerals and groundmass or whole rock is evidence for open-system Ra-Th behavior. This heterogeneity suggests there has been recent, post-crystallization, changes in melt chemical composition that affected Ra-226 more than Th-230. Clearly, magma fractionation, residence and transport of crystal-melt before eruption of chemically diverse lavas at Mount St. Helens occurs over geologically short periods. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. PORTLAND STATE UNIV,DEPT GEOL,PORTLAND,OR 97207. NR 42 TC 98 Z9 98 U1 2 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0012-821X J9 EARTH PLANET SC LETT JI Earth Planet. Sci. Lett. PD DEC PY 1991 VL 107 IS 3-4 BP 475 EP 486 DI 10.1016/0012-821X(91)90094-X PG 12 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA GZ589 UT WOS:A1991GZ58900004 ER PT J AU WINEMILLER, KO AF WINEMILLER, KO TI ECOMORPHOLOGICAL DIVERSIFICATION IN LOWLAND FRESH-WATER FISH ASSEMBLAGES FROM 5 BIOTIC REGIONS SO ECOLOGICAL MONOGRAPHS LA English DT Article DE COMMUNITIES; ECOLOGICAL CONVERGENCE; FRESH-WATER FISH COMMUNITIES; INTERCONTINENTAL COMPARISONS; MORPHOLOGICAL DIVERSIFICATION; NICHE DIVERSIFICATION; ORDERS; PHYLOGENY; RESOURCE PARTITIONING; SPECIES PACKING; SPECIES RICHNESS ID COMMUNITY ORGANIZATION; RAINFOREST STREAMS; PASSERINE BIRDS; BAT FAUNAS; MORPHOLOGY; EVOLUTION; TAXOCENES; LIZARDS; NORTH AB This study investigates the relationships among species diversity, community structure, and convergent evolution among divergent fish faunas. Morphological traits can be used as surrogates for ecological data in the comparative study of community niche relationships. In the present study I examined 30 morphological features related to the ecology of the dominant fish species from lowland stream and backwater habitats in five widely separated geographic regions: nearctic Alaska, temperate North America, Central America, South America, and tropical Africa. The study regions exhibited a general gradient of species richness from a minimum of 6 dominant species at one of the high-latitude sites (65-degrees-N) to a maximum of 43 numerically dominant species at a neotropical site (8-degrees-N). Fishes from Alaskan sites near the edge of the polar circle tended to be larger than fishes at other sites. Mean values for most morphological characters varied little between regions, indicating similar faunal centroids in morphological space. Morphological diversification within fish assemblages was estimated from species similarities based on Euclidean distances plus species projections on the principal axes from multivariate analysis. The total morphological space encompassed by ichthyofaunas in both stream and backwater sites was generally concordant with the latitudinal and species-richness gradient, with low-diversity nearctic assemblages exhibiting little morphological diversification relative to high-diversity tropical faunas. The Central American assemblages showed a greater range of ecomorphological diversification than African assemblages that contained a few more species, and this pattern may be related to greater seasonal stability at the Central American site. Phenetic patterns of dispersion reflect ecological relationships in which greater numbers of coexisting species are associated with higher levels of niche diversification and ecological specialization, leading to enhanced resource partitioning. Without additional ecological information, a community morphological analysis cannot directly determine whether or not increased ecological specialization is associated with the addition of new resources on the fringes of resource space or with increased subdivision of previously utilized core resources. Based on ecological information gathered concurrently with the fishes used in this analysis, I conclude that close species packing in morphological space is associated with niche generalists rather than with niche compression. With the possible exception of the two high-latitude sites, assemblages that contained more fish species generally did not exhibit tighter packing in niche space than species-poor assemblages, and this result was observed for comparisons both within and between regions. In contrast with several earlier studies, I interpret the lack of correlation between species richness and the average minimum distance between species in assemblage morphospace as being entirely consistent with the observed expansion of morphospace with species richness and latitude. Morphological patterns show that average spacing is held more or less constant as the variety of ecomorphological configurations increases in more-speciose fish assemblages. Even though morphological characters reflect community relationships, tight packing near the center of faunal morphospace actually indicates the opposite of species packing (niche compression) in the traditional sense of resource-utilization curves. The analysis supports the thesis that species interactions are important determinants of community morphological features, particularly in species-rich tropical regions. Relative to assemblages in the other four regions, the two Alaskan fish assemblages were hyperdispersed within a comparatively small morphological space. The Alaskan fish assemblages probably formed via geologically recent, and perhaps repeated, colonizations of polar freshwaters by species with evolutionary histories in more diverse southern and coastal fish faunas. I interpret evidence of greater niche diversification at lower latitudes within a habitat type as being derived primarily from the influence of competition and predation, whereas differences between habitats within regions seems to be associated with the combined effects of biotic interactions and differences in habitat volume and heterogeneity. Even though different regions within ecomorphological space were dominated by different fish orders, numerous ecomorphological convergences and several one-for-one ecological equivalents were identified within different biotic regions. C1 UNIV TENNESSEE,GRAD PROGRAM ECOL,KNOXVILLE,TN 37996. RP WINEMILLER, KO (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. RI Langerhans, R./A-7205-2009; OI Winemiller, Kirk/0000-0003-0236-5129 NR 67 TC 220 Z9 229 U1 2 U2 52 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 DEC PY 1991 VL 61 IS 4 BP 343 EP 365 DI 10.2307/2937046 PG 23 WC Ecology SC Environmental Sciences & Ecology GA GQ967 UT WOS:A1991GQ96700001 ER PT J AU FRAZER, NB GIBBONS, JW GREENE, JL AF FRAZER, NB GIBBONS, JW GREENE, JL TI LIFE-HISTORY AND DEMOGRAPHY OF THE COMMON MUD TURTLE KINOSTERNON-SUBRUBRUM IN SOUTH-CAROLINA, USA SO ECOLOGY LA English DT Article DE DEMOGRAPHY; FECUNDITY; KINOSTERNON-SUBRUBRUM; LIFE TABLE; SURVIVORSHIP; TURTLES ID LOGGERHEAD SEA TURTLES; FRESH-WATER TURTLES; REPRODUCTIVE CHARACTERISTICS; CHRYSEMYS-PICTA; PHENOTYPIC PLASTICITY; CUMBERLAND ISLAND; HATCHING SUCCESS; AQUATIC TURTLES; NESTING ECOLOGY; CARETTA-CARETTA AB This paper presents a life table for the common mud turtle, Kinosternon subrubrum, in a fluctuating aquatic habitat on the Upper Coastal Plain of South Carolina, USA, using data gathered in a 20-yr mark-recapture study. Data on survivorship and fecundity (clutch size, per capita clutch frequency) were assessed and compared to previously published life table statistics for the slider turtle, Trachemys scripta, in the same body of water and for the yellow mud turtle, K. flavescens, in Nebraska. The annual survival rate for adult female Kinosternon (87.6%) is significantly higher than that of adult female Trachemys (77.4%). Similarly, male Kinosternon exhibit an annual survival rate (89.0%) significantly higher than that of male Trachemys (83.4%). The mean annual proportion of female Kinosternon that are reproductively active (50.7%) also is significantly higher than that of Trachemys (37.2%). In addition, survival rate from the time eggs are laid by Kinosternon until the hatchlings enter the aquatic environment (26.1 %) is significantly higher than that for Trachemys (10.5%). Comparisons of our findings with those for K. flavescens indicate that these geographically separate populations of congeneric species also differ substantially in age at maturity, mean generation time, and the mean proportion of females that are reproductively active in any given year. Differences were also apparent in mean clutch frequencies and adult survival rates. The differences in life history traits between the two geographically separated populations of congeners seem to be as great as those between the two syntopic populations representing different families (Kinosternidae: K. subrubrum and Emydidae: Trachemys scripta). The comparison of life tables for two species from different families having different ecological and evolutionary histories, but living in the same habitat, and of congeneric species in different habitats, is instructive regarding the biological flexibility of species under natural conditions. However, the study suggests that environmental variability has a greater effect on life table statistics than do phylogenetic relationships. C1 SAVANNAH RIVER ECOL LAB, AIKEN, SC 29802 USA. RP FRAZER, NB (reprint author), MERCER UNIV, DEPT BIOL, MACON, GA 31207 USA. NR 75 TC 46 Z9 51 U1 0 U2 16 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 1990 M STREET NW, STE 700, WASHINGTON, DC 20036 USA SN 0012-9658 J9 ECOLOGY JI Ecology PD DEC PY 1991 VL 72 IS 6 BP 2218 EP 2231 DI 10.2307/1941572 PG 14 WC Ecology SC Environmental Sciences & Ecology GA GV769 UT WOS:A1991GV76900028 ER PT J AU KIDNER, R BOSE, A AF KIDNER, R BOSE, A TI EFFECTS ON STATE ESTIMATION OF TIME-SKEW ERRORS IN INTER-UTILITY DATA EXCHANGE SO ELECTRIC POWER SYSTEMS RESEARCH LA English DT Article AB Inter-utility data exchange poses several unresolved problems. One is the error caused by time skewing of exchanged data. Three manifestations of time skewing, namely, load changes, inter-area interchange changes, and external topology changes, are addressed. The system under study is the IEEE 118-bus system. The system is modified incrementally and solved using a power flow program to simulate different operating states in time. For each operating state the system is divided into three parts, an internal system and two external systems. Selected modified external operating states are combined with the unmodified internal system and solved using a state estimator program, thus simulating exchanging data with various amounts of time skew. The results of load changes and inter-area interchange changes are predictable relationships between errors and changes. Although the actual amount of error would be difficult to determine in actual operation, it could be reliably minimized. The results of topology changes are much less predictable but are considerably easier to detect and may possibly be avoided completely. RP KIDNER, R (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0378-7796 J9 ELECTR POW SYST RES JI Electr. Power Syst. Res. PD DEC PY 1991 VL 22 IS 3 BP 165 EP 171 DI 10.1016/0378-7796(91)90002-5 PG 7 WC Engineering, Electrical & Electronic SC Engineering GA HC208 UT WOS:A1991HC20800002 ER PT J AU LEES, JA BUCHKOVICH, KJ MARSHAK, DR ANDERSON, CW HARLOW, E AF LEES, JA BUCHKOVICH, KJ MARSHAK, DR ANDERSON, CW HARLOW, E TI THE RETINOBLASTOMA PROTEIN IS PHOSPHORYLATED ON MULTIPLE SITES BY HUMAN CDC2 SO EMBO JOURNAL LA English DT Article DE CDC2; PHOSPHORYLATION; RETINOBLASTOMA ID LARGE T-ANTIGEN; MATURATION-PROMOTING FACTOR; ADENOVIRUS E1A PROTEINS; H-1 HISTONE KINASE; CELL-CYCLE CONTROL; SV40 LARGE-T; GENE-PRODUCT; SUSCEPTIBILITY GENE; RB GENE; TRANSCRIPTION FACTOR AB The retinoblastoma gene product (pRB) is a nuclear phosphoprotein that is thought to play a key role in the negative regulation of cellular proliferation. pRB is phosphorylated in a cell cycle dependent manner, and studies in both actively dividing and differentiated cells suggest that this modification may be essential for cells to progress through the cell cycle. Using tryptic phosphopeptide mapping we have shown that pRB is phosphorylated on multiple serine and threonine residues in vivo and that many of these phosphorylation events can be mimicked in vitro using purified p34cdc2. Using synthetic peptides corresponding to potential cdc2 phosphorylation sites, we have developed a strategy which has allowed the identification of five sites. S249, T252, T373, S807 and S811 are phosphorylated in vivo, and in each case these sites correspond closely to the consensus sequence for phosphorylation by p34cdc2. This and the observation that pRB forms a specific complex with p34cdc2 in vivo suggests that p34cdc2 or a p34cdc2-related protein is a major pRB kinase. C1 MASSACHUSETTS GEN HOSP, CTR CANC, BOSTON, MA 02114 USA. BROOKHAVEN NATL LAB, DEPT BIOL, UPTON, NY 11973 USA. RP COLD SPRING HARBOR LAB, POB 100, COLD SPRING HARBOR, NY 11724 USA. FU NCI NIH HHS [CA13106]; NIAID NIH HHS [AI25170] NR 69 TC 319 Z9 320 U1 0 U2 5 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0261-4189 EI 1460-2075 J9 EMBO J JI Embo J. PD DEC PY 1991 VL 10 IS 13 BP 4279 EP 4290 PG 12 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA GU645 UT WOS:A1991GU64500034 PM 1756735 ER PT J AU SATHAYE, JA AF SATHAYE, JA TI CLIMATE CHANGE - COUNTRY CASE-STUDIES - INTRODUCTION SO ENERGY POLICY LA English DT Editorial Material RP SATHAYE, JA (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,ENERGY ANAL PROGRAM,BERKELEY,CA 94720, USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0301-4215 J9 ENERG POLICY JI Energy Policy PD DEC PY 1991 VL 19 IS 10 BP 906 EP 910 DI 10.1016/0301-4215(91)90108-Z PG 5 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA GV499 UT WOS:A1991GV49900001 ER PT J AU GRUBB, M RAYNER, S TANABE, A RUSSELL, J LEDIC, M MATHUR, A BRACKLEY, P AF GRUBB, M RAYNER, S TANABE, A RUSSELL, J LEDIC, M MATHUR, A BRACKLEY, P TI ENERGY POLICIES AND THE GREENHOUSE-EFFECT - A STUDY OF NATIONAL DIFFERENCES SO ENERGY POLICY LA English DT Article DE CO-2 ABATEMENT; COUNTRY STUDIES; GREENHOUSE GASES AB Country studies emphasize large national differences in underlying attitudes towards energy and the greenhouse effect. Technical opportunities for limiting CO2 emissions exist in all countries, but the type of abatement policies that are feasible, the extent to which they can be effectively implemented and their likely impacts vary widely. The potential for curtailing emissions is determined by factors including: the stage of a country's development; the character of its economic system and philosophy; its political culture; and the nature of its energy infrastructure, institutions and attitudes, all of which are determined by the past and current availability of cheap domestic energy resources. Abatement is not just about technology and costs, but about culture, institutions and politics in the broadest sense. C1 OAK RIDGE NATL LAB,CTR GLOBAL ENVIRONM STUDIES,OAK RIDGE,TN. TOKYO ELECT POWER CO LTD,TOKYO,JAPAN. SHELL UK LTD,LONDON,ENGLAND. UNIV LONDON BIRKBECK COLL,LONDON WC1E 7HX,ENGLAND. TATA ENERGY RES INST,NEW DELHI 110003,INDIA. RP GRUBB, M (reprint author), ROYAL INST INT AFFAIRS,ENERGY & ENVIRONM PROGRAMME,CHATHAM HOUSE,10 ST JAMES SQ,LONDON SW1Y 4LE,ENGLAND. NR 2 TC 1 Z9 1 U1 1 U2 2 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 DEC PY 1991 VL 19 IS 10 BP 911 EP 917 DI 10.1016/0301-4215(91)90109-2 PG 7 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA GV499 UT WOS:A1991GV49900002 ER PT J AU MENDOZA, Y MASERA, O MACIAS, P AF MENDOZA, Y MASERA, O MACIAS, P TI LONG-TERM ENERGY SCENARIOS FOR MEXICO - POLICY OPTIONS FOR CARBON SAVINGS AND MAIN BARRIERS SO ENERGY POLICY LA English DT Article DE CARBON SAVINGS; LONG-TERM ENERGY SCENARIOS; ENERGY EFFICIENCY BARRIERS AB This paper shows that possibilities exist for maintaining current energy-related carbon emissions per capita in Mexico at almost constant levels in the long term. It is argued, however, that the identified carbon emissions reductions will not be achieved easily or rapidly, as they require a restructuring of Mexico's current technological base and an unusual degree of coordination among the government, lending institutions, equipment manufacturers, and final users. Such changes also will entail surmounting major institutional and financial barriers and creating a better international environment for technology transfer and capital lending. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,INT ENERGY STUDIES GRP,BERKELEY,CA 94720. RP MENDOZA, Y (reprint author), MEXICOS ENERGY MINIST,FRANCISCO MARQUEZ 160-PB,MEXICO CITY 11300,DF,MEXICO. NR 11 TC 3 Z9 3 U1 0 U2 3 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 DEC PY 1991 VL 19 IS 10 BP 962 EP 969 DI 10.1016/0301-4215(91)90116-6 PG 8 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA GV499 UT WOS:A1991GV49900009 ER PT J AU MONGIA, N BHATIA, R SATHAYE, J MONGIA, P AF MONGIA, N BHATIA, R SATHAYE, J MONGIA, P TI COST OF REDUCING CO-2 EMISSIONS FROM INDIA - IMPERATIVES FOR INTERNATIONAL TRANSFER OF RESOURCES AND TECHNOLOGIES SO ENERGY POLICY LA English DT Article DE CARBON CONSTRAINTS; INDIA; TECHNOLOGY-CHOICE MODEL AB This paper evaluates the cost, capital and foreign exchange requirements associated with restraining the growth of CO2 emissions in India through a range of technological alternatives. The different options include higher-cost efficiency improvements, fuel switching from coal to oil to gas and increasing the use of renewables. The paper also examines the types of actions required at both the national and international levels to effectively curtail India's CO2 growth. The development of a coupon system, which would allow carbon-restraining technologies to be transferred from the industrialized to the developing world, is one of the novel mechanisms suggested in this analysis. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP MONGIA, N (reprint author), UNIV DELHI,SCH ECON,DELHI 110007,INDIA. NR 12 TC 7 Z9 7 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 DEC PY 1991 VL 19 IS 10 BP 978 EP 986 DI 10.1016/0301-4215(91)90118-8 PG 9 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA GV499 UT WOS:A1991GV49900011 ER PT J AU GRACA, GMG KETOFF, AN AF GRACA, GMG KETOFF, AN TI CO-2 SAVINGS IN BRAZIL - THE IMPORTANCE OF A SMALL CONTRIBUTION SO ENERGY POLICY LA English DT Article DE BRAZIL; CARBON SAVINGS; ENERGY-USE SCENARIOS AB Brazil's development process could lead potentially to a doubling of CO2 emissions per capita over the next four decades. This paper shows that the implementation of policy measures promoting energy efficiency and fuel switching could reduce Brazil's energy-related CO2 per capita by 11% by 2025 with respect to their 1985 level without necessitating any significant change in lifestyles. While Brazil's total reductions would be equivalent to only 1% of present global carbon emissions, capturing these savings opportunities would both allow Brazil to participate in global efforts to curtail the generation of greenhouse gases into the atmosphere and support Brazil's own economic development process. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,INT ENERGY STUDIES GRP,BERKELEY,CA 94720. RP GRACA, GMG (reprint author), UNIV SAO PAULO,INST ELETROTECN & ENERGIA,SAO PAULO,BRAZIL. NR 13 TC 1 Z9 1 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0301-4215 J9 ENERG POLICY JI Energy Policy PD DEC PY 1991 VL 19 IS 10 BP 1003 EP 1010 DI 10.1016/0301-4215(91)90121-4 PG 8 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA GV499 UT WOS:A1991GV49900014 ER PT J AU GOLD, LS SLONE, TH MANLEY, NB GARFINKEL, GB HUDES, ES ROHRBACH, L AMES, BN AF GOLD, LS SLONE, TH MANLEY, NB GARFINKEL, GB HUDES, ES ROHRBACH, L AMES, BN TI THE CARCINOGENIC POTENCY DATABASE - ANALYSES OF 4000 CHRONIC ANIMAL CANCER EXPERIMENTS PUBLISHED IN THE GENERAL LITERATURE AND BY THE UNITED-STATES-NATIONAL-CANCER-INSTITUTE NATIONAL TOXICOLOGY PROGRAM SO ENVIRONMENTAL HEALTH PERSPECTIVES LA English DT Article ID RODENT CARCINOGENS; CHRONOLOGICAL SUPPLEMENT; BIOASSAYS; CHEMICALS; PESTICIDES; RANKING; HAZARDS; RATS; MICE; RISK AB The Carcinogenic Potency Database (CPDB) is an easily accessible, standardized resource of positive and negative long-term animal cancer tests. The CPDB has been published in four earlier papers that include results for approximately 4000 experiments on 1050 chemicals. This paper describes the CPDB: goals, inclusion criteria, fields of information, and published plot format. It also presents an overview of our published papers using the CPDB. The CPDB as published in plot format readily permits comparisons of carcinogenic potency and many other aspects of cancer tests, including for each experiment the species and strain of test animal, the route and duration of compound administration, dose level and other aspects of experimental protocol, histopathology and tumor incidence, TD50 (carcinogenic potency) and its statistical significance, dose response, author's opinion about carcinogenicity, and literature citation. A combined plot of all results from the four separate papers, which is ordered alphabetically by chemical, is available from L. S. Gold, in printed form or on computer tape or diskette. A computer readable (SAS) database is also available. The overview of papers includes descriptions of work on methods of estimating carcinogenic potency, reproducibility of results in near-replicate cancer tests, correlation in potency between species, ranking possible carcinogenic hazards, comparison of positivity. and target organ in rats and mice, comparison of mutagens and nonmutagens, proportion of chemicals positive in animal tests, natural compared to synthetic chemicals, and mechanistic issues in interspecies extrapolation. C1 UNIV CALIF BERKELEY,DIV BIOCHEM & MOLEC BIOL,BERKELEY,CA 94720. RP GOLD, LS (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720, USA. FU NIEHS NIH HHS [ES01896] NR 30 TC 54 Z9 55 U1 0 U2 2 PU US DEPT HEALTH HUMAN SERVICES PUBLIC HEALTH SERVICE PI RES TRIANGLE PK PA NATL INST HEALTH, NATL INST ENVIRONMENTAL HEALTH SERVICES, PO BOX 12233, RES TRIANGLE PK, NC 27709-2233 SN 0091-6765 J9 ENVIRON HEALTH PERSP JI Environ. Health Perspect. PD DEC PY 1991 VL 96 BP 11 EP 15 DI 10.2307/3431201 PG 5 WC Environmental Sciences; Public, Environmental & Occupational Health; Toxicology SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Toxicology GA HT428 UT WOS:A1991HT42800003 PM 1820251 ER PT J AU AULETTA, AE BROWN, M WASSOM, JS CIMINO, MC AF AULETTA, AE BROWN, M WASSOM, JS CIMINO, MC TI CURRENT STATUS OF THE GENE-TOX PROGRAM SO ENVIRONMENTAL HEALTH PERSPECTIVES LA English DT Article ID PHASE-II; CARCINOGENICITY; MUTAGENICITY; BIOASSAYS; CHEMICALS; ASSAYS AB The U.S. Environmental Protection Agency's Gene-Tox Program is a multiphased effort to review and evaluate the existing literature in assay systems available in the field of genetic toxicology. The first phase of the Gene-Tox Program selected assay systems for evaluation, generated expert panel reviews of the data from the scientific literature, and recommended testing protocols for the systems. Phase II established and evaluated the database of chemical genetic toxicity data for its relevance to identifying human health hazards. The ongoing phase III continues reviewing and updating chemical data in selected assay systems. Currently, data exist on over 4000 chemicals in 27 assay systems; two additional assay systems will be included in phase III. The review data are published in the scientific literature and are also publicly available through the National Library of Medicine TOXNET system. The review and analysis components of Gene-Tox comprise 45 published papers, and several others are in preparation. Differences that have been observed between Gene-Tox and National Toxicology Program databases relative to the sensitivity, specificity, accuracy, and predictivity of genetic toxicity data compared to carcinogenesis data are ascribable to differences between the two databases in chemical selection criteria, testing protocols, and chemical class distributions. C1 OAK RIDGE NATL LAB,DIV HUMAN GENOME & TOXICOL,OAK RIDGE,TN 37831. RP AULETTA, AE (reprint author), US EPA,DIV HLTH & ENVIRONM REVIEW,OFF TOX SUBSTANCES,TS-796,WASHINGTON,DC 20460, USA. NR 6 TC 8 Z9 8 U1 0 U2 0 PU US DEPT HEALTH HUMAN SERVICES PUBLIC HEALTH SERVICE PI RES TRIANGLE PK PA NATL INST HEALTH, NATL INST ENVIRONMENTAL HEALTH SERVICES, PO BOX 12233, RES TRIANGLE PK, NC 27709-2233 SN 0091-6765 J9 ENVIRON HEALTH PERSP JI Environ. Health Perspect. PD DEC PY 1991 VL 96 BP 33 EP 36 DI 10.2307/3431204 PG 4 WC Environmental Sciences; Public, Environmental & Occupational Health; Toxicology SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Toxicology GA HT428 UT WOS:A1991HT42800006 PM 1820273 ER PT J AU KOCHER, DC HOFFMAN, FO AF KOCHER, DC HOFFMAN, FO TI REGULATING ENVIRONMENTAL CARCINOGENS - WHERE DO WE DRAW THE LINE SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID RADIATION C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RP KOCHER, DC (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831, USA. NR 25 TC 8 Z9 9 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD DEC PY 1991 VL 25 IS 12 BP 1986 EP 1989 DI 10.1021/es00024a003 PG 4 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA GT529 UT WOS:A1991GT52900008 ER PT J AU ANDERSON, MA BERTSCH, PM FELDMAN, SB ZELAZNY, LW AF ANDERSON, MA BERTSCH, PM FELDMAN, SB ZELAZNY, LW TI INTERACTIONS OF ACIDIC METAL-RICH COAL PILE RUNOFF WITH A SUBSOIL SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID MINE DRAINAGE; SULFATE; STREAM; ALUMINUM; WATERS; ADSORPTION; SOILS; ELECTROPHORESIS; ATTENUATION; SEDIMENTS AB Highly acidic and metal-rich runoff from coal storage facilities can have a dramatic impact on local surface water and groundwater quality. In order to identify important reactions governing metal transport within subsurface environments subject to infiltration of coal pile runoff (CPR), samples of uncontaminated subsoil adjacent to a coal stockpile runoff containment basin at the U.S. Department of Energy's Savannah River Site were collected and subjected to leaching with acidic, metalliferous CPR. Effluent was collected and multicomponent transport through the subsoil evaluated. Mass balance calculations, a sequential dissolution scheme in which column leaching was terminated and elements were partitioned to water, 1 M NH4Cl, and ammonium oxalate in the dark-extractable phases, and mineralogical and surface chemical analyses were used to identify important chemical processes and mineralogical alterations occurring during leaching. C1 UNIV GEORGIA,SAVANNAH RIVER ECOL,DIV BIOGEOCHEM,AIKEN,SC 29801. VIRGINIA POLYTECH INST & STATE UNIV,DEPT CROP & SOIL ENVIRONM,BLACKSBURG,VA 24061. RP ANDERSON, MA (reprint author), UNIV CALIF RIVERSIDE,DEPT SOIL & ENVIRONM SCI,RIVERSIDE,CA 92521, USA. NR 42 TC 13 Z9 13 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD DEC PY 1991 VL 25 IS 12 BP 2038 EP 2046 DI 10.1021/es00024a008 PG 9 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA GT529 UT WOS:A1991GT52900014 ER PT J AU MCKINLEY, JP JENNE, EA AF MCKINLEY, JP JENNE, EA TI EXPERIMENTAL INVESTIGATION AND REVIEW OF THE SOLIDS CONCENTRATION EFFECT IN ADSORPTION STUDIES SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID AMORPHOUS IRON OXYHYDROXIDE; OXIDE-WATER INTERFACE; PARTICLE CONCENTRATION; SURFACE IONIZATION; AQUATIC SYSTEMS; SORPTION; COMPLEXATION; PARTITION; MODEL; POLLUTANTS AB Abundant literature references suggest that unit adsorption (i.e., mass of adsorbate sorbed per unit mass of adsorbent) declines as the mass of available adsorbent per unit volume increases. Adsorption of cadmium by iron oxyhydroxide was experimentally quantified at pH 7.00 for equilibrium aqueous cadmium of 0.025-22000 nM and for suspended iron oxyhydroxide concentrations of 0.5-50 mmol/L. For the full range of solids concentrations, over all equilibrium cadmium concentrations, adsorption was approximated by a single Freundlich isotherm. An exception to this was slightly increased unit adsorption at high relative solids or low relative aqueous concentrations, which were inversely related. Examination of published accounts of the "solids concentration" effect-excluding those which are admittedly caused by experimental artifacts-revealed either inappropriate experimental design or errors of data interpretation. RP MCKINLEY, JP (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 33 TC 76 Z9 77 U1 3 U2 8 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 DEC PY 1991 VL 25 IS 12 BP 2082 EP 2087 DI 10.1021/es00024a015 PG 6 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA GT529 UT WOS:A1991GT52900021 ER PT J AU WALKER, RF MCLAUGHLIN, SB AF WALKER, RF MCLAUGHLIN, SB TI GROWTH AND ROOT-SYSTEM DEVELOPMENT OF WHITE OAK AND LOBLOLLY-PINE AS AFFECTED BY SIMULATED ACIDIC PRECIPITATION AND ECTOMYCORRHIZAL INOCULATION SO FOREST ECOLOGY AND MANAGEMENT LA English DT Article ID SYMBIONT PISOLITHUS-TINCTORIUS; SEEDLING GROWTH; RAIN; INFECTION; OZONE; SOIL; MINE AB Individual and interactive effects of simulated acidic rainfall and ectomycorrhizal inoculation on growth of white oak (Quercus alba L.) and loblolly pine (Pinus taeda L.) were examined. Seedlings of each species inoculated with basidiospores of Pisolithus tinctorius (Pers.) Coker and Couch and un inoculated control seedlings were exposed to two simulated rains per week of pH 4.8, 4.2 or 3.6, for 26 weeks. After the exposures, mycorrhizal quantification of complete root systems revealed that ectomycorrhizal development, whether by P. tinctorius on inoculated seedlings or by naturally occurring fungi on control seedlings, was greater on loblolly pine than on white oak. Also, although ectomycorrhizal development was greatest on loblolly pine treated with the most acidic of the simulated rains, there was no consistent effect of increasing acidity on mycorrhizal development of white oak. Diameter growth of white oak and height and diameter growth of loblolly pine were significantly increased by the P. tinctorius infection. Within both mycorrhizal treatments, exposure to rains of pH 3.6 significantly reduced the diameter growth of white oak, but rainfall acidity had little effect on the growth of loblolly pine. Of the variables examined, the data presented here suggest the primary effect of acid precipitation on white oak seedlings is on shoot diameter, whereas its primary effect on loblolly pine seedlings is on mycorrhizal development. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37830. RP WALKER, RF (reprint author), UNIV NEVADA,DEPT RANGE WILDLIFE & FORESTRY,1000 VALLEY RD,RENO,NV 89512, USA. NR 34 TC 7 Z9 7 U1 2 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-1127 J9 FOREST ECOL MANAG JI For. Ecol. Manage. PD DEC 1 PY 1991 VL 46 IS 1-2 BP 123 EP 133 DI 10.1016/0378-1127(91)90247-S PG 11 WC Forestry SC Forestry GA GU713 UT WOS:A1991GU71300007 ER PT J AU STAPP, HP AF STAPP, HP TI QUANTUM PROPENSITIES AND THE BRAIN MIND CONNECTION SO FOUNDATIONS OF PHYSICS LA English DT Article AB It is argued that an adequate scientific treatment of biological systems requires the use of an ontological interpretation of quantum mechanics, and that the propensity interpretation proposed by Popper and others, when applied to the brain, leads to a natural representation of conscious process within the quantum-mechanical description of brain process. Thus quantum mechanics, unlike classical mechanics, has a natural place for consciousness and, moreover, in a sense to be discussed, even requires it. RP STAPP, HP (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV PHYS,THEORET PHYS GRP,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 27 TC 20 Z9 20 U1 0 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0015-9018 J9 FOUND PHYS JI Found. Phys. PD DEC PY 1991 VL 21 IS 12 BP 1451 EP 1477 DI 10.1007/BF01889652 PG 27 WC Physics, Multidisciplinary SC Physics GA HH304 UT WOS:A1991HH30400005 ER PT J AU FARCASIU, M SMITH, C PRADHAN, VR WENDER, I AF FARCASIU, M SMITH, C PRADHAN, VR WENDER, I TI IRON COMPOUNDS AND IRON CATALYSTS - ACTIVITY IN REACTIONS RELEVANT TO DIRECT COAL-LIQUEFACTION SO FUEL PROCESSING TECHNOLOGY LA English DT Article ID OXIDE; SULFATE; SULFUR; HYDROCRACKING; HYDROCARBONS AB The catalytic activity of various iron compounds was studied using a model compound, 4-(1-naphthylmethyl)bibenzyl, which exhibits distinct decomposition patterns for radical, ion-radical or acidic environments. It was found that selective carbon cleavage takes place when dry iron compounds such as iron (III) oxide, sulfated iron oxides or FeOOH are used in the presence of sulfur. Acidic sites of the Bronsted type become active when the sulfated iron oxides are reacted in the presence of small amounts of water. Also, acidic activity can be induced in mixtures of iron (III) oxides with sulfur when heated in the presence of small amounts of water. C1 UNIV PITTSBURGH,DEPT CHEM & PETR ENGN,PITTSBURGH,PA 15261. RP FARCASIU, M (reprint author), US DOE,PITTSBURGH ENERGY TECHNOL CTR,POB 10940,PITTSBURGH,PA 15236, USA. NR 20 TC 27 Z9 29 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3820 J9 FUEL PROCESS TECHNOL JI Fuel Process. Technol. PD DEC PY 1991 VL 29 IS 3 BP 199 EP 208 DI 10.1016/0378-3820(91)90036-C PG 10 WC Chemistry, Applied; Energy & Fuels; Engineering, Chemical SC Chemistry; Energy & Fuels; Engineering GA GX540 UT WOS:A1991GX54000003 ER EF