FN Thomson Reuters Web of Science™ VR 1.0 PT J AU DOLAN, TJ BUTTERWORTH, GJ AF DOLAN, TJ BUTTERWORTH, GJ TI VANADIUM RECYCLING SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 11th Topical Meeting on the Technology of Fusion Energy CY JUN 19-23, 1994 CL NEW ORLEANS, LA AB Very stringent purity specifications must be applied to low activation vanadium alloys, in order to meet recycling goals requiring low residual dose rates after 50-100 years. Following a suitable cooling period after their use, the vanadium alloy components could be melted in a controlled atmosphere to remove volatile radioisotopes. The aim of the melting and decontamination process will be the achievement of dose cites low enough for ''hands-on'' refabrication of new reactor components from the reclaimed metal. The processes required to permit hands-on recycling appear to be technically feasible, and demonstration experiments are recommended. RP DOLAN, TJ (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 8 TC 26 Z9 26 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP 1014 EP 1020 PN 2 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600116 ER PT J AU CADWALLADER, LC AF CADWALLADER, LC TI VACUUM COMPONENT RELIABILITY ESTIMATES FOR EXPERIMENTAL FUSION FACILITIES SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 11th Topical Meeting on the Technology of Fusion Energy CY JUN 19-23, 1994 CL NEW ORLEANS, LA AB As fusion experiments grow in size, power, and tritium fuel consumption, the safety analyses for these experiments become more important for regulatory approval. With current trends in using probabilistic safety techniques, the need for component failure rate data for radioactivity confinement components has grown. This paper presents the results of a literature review for vacuum component reliability. Point estimate average failure rates and error factors are given for a wide variety of vacuum components used for fusion experiments. RP CADWALLADER, LC (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. RI Cadwallader, Lee/F-6933-2014 NR 7 TC 2 Z9 2 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP 1021 EP 1024 PN 2 PG 4 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600117 ER PT J AU GAETA, MJ MERRILL, BJ PETTI, DA AF GAETA, MJ MERRILL, BJ PETTI, DA TI LOCA TEMPERATURE HYDROGEN GENERATION PARAMETRIC STUDY FOR ITER TAC4 DESIGN SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 11th Topical Meeting on the Technology of Fusion Energy CY JUN 19-23, 1994 CL NEW ORLEANS, LA AB A parameter study of the transient thermal response of the recent International Thermonuclear Experimental Reactor design was performed for unmitigated loss of coolant accidents (LOCAs). Inboard component temperatures and hydrogen production levels remained low for an unmitigated blanket cooling system LOCA. Adding an unmitigated LOCA of the vacuum vessel cooling system to the blanket cooling system LOCA scenario results in much higher first wall temperatures and the production of flammable and, eventually, detonatable amounts of hydrogen in the plasma chamber. RP GAETA, MJ (reprint author), IDAHO NATL ENGN LAB,FUS SAFETY PROGRAM,IDAHO FALLS,ID 83415, USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP 1025 EP 1029 PN 2 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600118 ER PT J AU SPAMPINATO, PT COMMANDER, JC WALTON, GR AF SPAMPINATO, PT COMMANDER, JC WALTON, GR TI TECHNOLOGY ISSUES FOR DECOMMISSIONING THE TOKAMAK FUSION TEST REACTOR SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 11th Topical Meeting on the Technology of Fusion Energy CY JUN 19-23, 1994 CL NEW ORLEANS, LA AB The approach for decommissioning the Tokamak Fusion Test Reactor has evolved from a conservative plan based on cutting up and burying all of the systems, to one that considers the impact tritium contamination will have on waste disposal, how large size components may be used as their own shipping containers, and even the possibility of recycling the materials of components such as the toroidal field coils and the tokamak structure. In addition, the project is more carefully assessing the requirements for using remotely operated equipment. Finally, a valuable cost database is being developed for future use by the fusion community. C1 IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415. RP SPAMPINATO, PT (reprint author), PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP 1030 EP 1033 PN 2 PG 4 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600119 ER PT J AU DELOOPER, J AF DELOOPER, J TI FUSION SAFETY REGULATIONS IN THE US - PROGRESS AND TRENDS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 11th Topical Meeting on the Technology of Fusion Energy CY JUN 19-23, 1994 CL NEW ORLEANS, LA AB This paper explores the issue of regulations as they apply to current and future fusion experimental machines. It addresses fusion regulatory issues, current regulations used for fusion, the Tokamak Fusion Test Reactor [TFTR] experience with regulations, and future regulations to achieve fusion's safety and environmental potential. RP DELOOPER, J (reprint author), PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 0 TC 5 Z9 5 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP 1051 EP 1058 PN 2 PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600122 ER PT J AU SZE, DK AF SZE, DK TI RECENT DESIGNS FOR ADVANCED FUSION-REACTOR BLANKETS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 11th Topical Meeting on the Technology of Fusion Energy CY JUN 19-23, 1994 CL NEW ORLEANS, LA AB A series of reactor design studies based on the Tokamak configuration have been carried out under the direction of Professor Robert Conn of UCLA. They are called ARIES-I through IV. The key mission of these studies is to evaluate the attractiveness of fusion assuming different degrees of advancement in either physics or engineering development. This paper discusses the directions and conclusions of the blanket and related engineering systems for those design studies. ARIES-I investigated the use of SiC composite as the structural material to increase the blanket temperature and reduce the blanket activation. Li2ZrO3 was used as the breeding material due to its high temperature stability and good tritium recovery characteristics. To reduce the activation caused by the using of Zr, isotopic tailoring is required. Also, W was selected as the divertor target. The activation caused by the Zr and W, even with isotopic tailoring, reduced the safety advantage for the SiC blanket. The ARIES-IV is a modification of ARIES-I, The plasma was in the second stability regime. Li2O was used as the breeding material to remove Zr. A gaseous divertor was used to replace the conventional divertor so that high Z divertor target is not required. We investigated the possibility of breeding without the use of Be. However, tritium self sufficiency could not be assured with the uncertainties in the neutronic data. The safety advantage of ARIES-IV was enhanced by the removal of the high activation materials. The physics of ARIES-II was the same as ARIES-IV. The engineering design of the ARIES-II was based on a self-cooled lithium blanket with a V-alloy as the structural material. Even though it was assumed that the plasma was in the second stability regime, the plasma beta was still rather low (3.4%). To achieve an acceptable neutron wall loading, the magnetic field is rather high. This put an extra burden on a self-cooled liquid metal blanket. It was determined that a self-cooled lithium blanket with bare walls was not acceptable for a reactor with ARIES-II type parameters. Therefore, an insulating coating is required to assure an acceptable design window to reduce the MHD pressure drop. The ARIES-III is an advanced fuel (D-He-3) tokamak reactor. The reactor design assumed major advancement on the physics, with a plasma beta of 23.9%. A conventional structural material is acceptable due to the low neutron wall loading. From the radiation damage point of view, the first wall can last the life of the reactor, which is expected to be a major advantage from the engineering design and waste disposal point of view. Organic coolant was selected as the reactor coolant to reduce the operating temperature compared to He, and to reduce the coolant pressure and improve thermal efficiency compared to water. However, the use of organic coolant raised safety and decomposition concerns. RP SZE, DK (reprint author), ARGONNE NATL LAB,FUS POWER PROGRAM,9700 S CASS AVE,BLDG 207,ARGONNE,IL 60439, USA. NR 7 TC 2 Z9 2 U1 1 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP 1061 EP 1068 PN 2 PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600123 ER PT J AU DELENE, JG AF DELENE, JG TI ADVANCED FISSION AND FOSSIL PLANT ECONOMICS - IMPLICATIONS FOR FUSION SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 11th Topical Meeting on the Technology of Fusion Energy CY JUN 19-23, 1994 CL NEW ORLEANS, LA AB In order for fusion energy to be a viable option for electric power generation, it must either directly compete with future alternatives or serve as a reasonable backup if the alternatives become unacceptable. This paper discusses projected costs for the most likely competitors with fusion power for base-load electric capacity and what these costs imply for fusion economics. The competitors examined include advanced nuclear fission and advanced fossil-fired plants. The projected costs and their basis are discussed. The estimates for these technologies are compared with cost estimates for magnetic and inertial confinement fusion plants. The conclusion of the analysis is that fusion faces formidable economic competition. Although the cost level for fusion appears greater than that for fission or fossil, the costs are not so high as to preclude fusion's potential competitiveness. RP DELENE, JG (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 14 TC 11 Z9 11 U1 0 U2 2 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP 1105 EP 1110 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600129 ER PT J AU KRAKOWSKI, RA BATHKE, CG MILLER, RL WERLEY, KA AF KRAKOWSKI, RA BATHKE, CG MILLER, RL WERLEY, KA TI LESSONS LEARNED FROM THE TOKAMAK ADVANCED REACTOR INNOVATION AND EVALUATION STUDY (ARIES) SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 11th Topical Meeting on the Technology of Fusion Energy CY JUN 19-23, 1994 CL NEW ORLEANS, LA AB Lessons from the four-year ARIES (Advanced Reactor Innovation and Evaluation Study) investigation of a number of commercial magnetic-fusion-energy (MFE) power-plant embodiments of the tokamak are summarized. These lessons apply to physics, engineering and technology, and environmental, safety, and health (ES&H) characteristics of projected tokamak power plants. A general conclusion from this extensive investigation of the commercial potential of tokamak power plants is the need for combined, symbiotic advances relative to present understanding in physics, engineering, and materials before economic competitiveness with developing advanced energy sources can be realized. Advanced tokamak plasmas configured in the second-stability regime that achieve both high beta and bootstrap fractions near unity through strong profile control offer high promise in this regard. RP KRAKOWSKI, RA (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 16 TC 4 Z9 4 U1 1 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP 1111 EP 1118 PN 2 PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600130 ER PT J AU SHEFFIELD, J GALAMBOS, JD AF SHEFFIELD, J GALAMBOS, JD TI PROSPECTS FOR TOROIDAL FUSION-REACTORS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 11th Topical Meeting on the Technology of Fusion Energy CY JUN 19-23, 1994 CL NEW ORLEANS, LA ID TOKAMAK AB Work on the International Thermonuclear Experimental Reactor (ITER) tokamak has refined understanding of the realities of a deuterium-tritium (D-T) burning magnetic fusion reactor. An ITER-like tokamak reactor using ITER costs and performance would lead to a cost of electricity (COE) of about 13O mills/kWh. Advanced tokamak physics to be tested in the Toroidal Physics Experiment (TPX), coupled with moderate extrapolation in engineering, technology, and unit costs (i.e., based on the ITER design), should lead to a COE comparable with best existing fission systems around 60 mills/kWh. However, a larger unit size, similar to 2000 MW((e)), is favored for the fusion system. Alternative toroidal configurations to the conventional tokamak, such as the stellarator, reversed-field pinch, and field-reversed configuration, offer some potential advantage, but are less well developed, and have their own challenges. RP SHEFFIELD, J (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 13 TC 3 Z9 3 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP 1122 EP 1126 PN 2 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600132 ER PT J AU MILLER, RL AF MILLER, RL TI ADVANCED STELLARATOR POWER-PLANTS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 11th Topical Meeting on the Technology of Fusion Energy CY JUN 19-23, 1994 CL NEW ORLEANS, LA ID ADVANCED TOROIDAL FACILITY; CONFINEMENT; PROGRESS; DESIGN AB The stellarator is a class of helical/toroidal magnetic fusion devices. Recent international progress in stellarator power plant conceptual design is reviewed and comparisons in the areas of physics, engineering, and economies are made with recent tokamak design studies. RP MILLER, RL (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 36 TC 2 Z9 2 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP 1127 EP 1132 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600133 ER PT J AU EHST, DA AF EHST, DA TI TOKAMAK POWER-PLANT BURN CYCLE OPTIONS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 11th Topical Meeting on the Technology of Fusion Energy CY JUN 19-23, 1994 CL NEW ORLEANS, LA AB Experiments show that tokamaks can operate in various fashions. Economic analyses show that steady state is most attractive provided the physics and technology of current drive (CD) can be modestly improved. Even with very conservative CD assumptions a hybrid operating mode seems superior to conventional, simple inductive operation. RP EHST, DA (reprint author), ARGONNE NATL LAB,DIV TECHNOL DEV,FUS POWER PROGRAM,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP 1133 EP 1140 PN 2 PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600134 ER PT J AU GIERSZEWSKI, P WILLIAMS, G BLEVINS, J BRUNNADER, H CUMYN, P DEAN, B GALAMBOS, J HOLLOWAY, C KELLY, R NATALIZIO, A SMITH, S AF GIERSZEWSKI, P WILLIAMS, G BLEVINS, J BRUNNADER, H CUMYN, P DEAN, B GALAMBOS, J HOLLOWAY, C KELLY, R NATALIZIO, A SMITH, S TI CFFTP FUSION PILOT-PLANT SCOPING STUDY SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 11th Topical Meeting on the Technology of Fusion Energy CY JUN 19-23, 1994 CL NEW ORLEANS, LA ID TECHNOLOGY AB The CFFTP Pilot plant concept is a driven, steady-state I-I-mode tokamak with ion cyclotron current drive. The fuel cycle uses low-tritium-inventory technologies, including compact toroid fuelling. The mechanical design is based on helium cooling, radial blanket maintenance, ceramic pebble breeder blanket, and demountable copper magnets. It is expected to operate for 1 full-power-year with 0.25 MW/m(2) average (0.4 MW/m(2) peak) neutron wall load. The machine would produce 20 MW of fusion power with 40 MW of auxiliary power. The 2.7 MA plasma current is ramped up inductively, and then sustained by the bootstrap current (32%) and fast wave current drive (68%). The plasma would be roughly the size of the TFTR plasma, but elongated with double-null diverters and an aspect ratio of 5. The total electric power consumption would be around 450 MWe. The tritium supply requirements, given partial breeding, would be only 0.8 kg. The on-site tritium inventory would be about 0.3 kg. The direct construction cost-is estimated at 1.1 B$Cdn, with a total project cost of 2.3 B$Cdn (1992). CFFTP Pilot would provide steady-state integrated nuclear testing at a fluence and neutron wall load of about one-quarter ITER CDA, for a cost of about one-third ITER CDA. The blanket test area would be similar to the ITER CDA blanket test port area. C1 CANATOM INC,MONTREAL,PQ,CANADA. WARDROP ENGN INC,WINNIPEG,MB,CANADA. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. SPAR AEROSP LTD,ST ANNE BELLEVUE,PQ,CANADA. RP GIERSZEWSKI, P (reprint author), CANADIAN FUS FUELS TECHNOL PROJECT,MISSISSAUGA,ON,CANADA. NR 10 TC 0 Z9 0 U1 1 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP 1146 EP 1150 PN 2 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600136 ER PT J AU EMMERT, GA ELGUEBALY, LA KULCINSKI, GL SANTARIUS, JF SVIATOSLAVSKY, IN MEADE, DM AF EMMERT, GA ELGUEBALY, LA KULCINSKI, GL SANTARIUS, JF SVIATOSLAVSKY, IN MEADE, DM TI IMPROVEMENT IN FUSION-REACTOR PERFORMANCE DUE TO ION CHANNELING SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 11th Topical Meeting on the Technology of Fusion Energy CY JUN 19-23, 1994 CL NEW ORLEANS, LA AB Ion channeling is a recent idea for improving the performance of fusion reactors by increasing the fraction of the fusion power deposited in the ions. In this paper we assess the effect of ion channeling on D-T and D-He-3 reactors. The figures of merit used are the fusion power density and the cost of electricity. It is seen that significant ion channeling can lead to about a 50-65% increase in the fusion power density. For the Apollo D-He-3 reactor concept the reduction in the cost of electricity can be as large as 30%. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544. RP EMMERT, GA (reprint author), UNIV WISCONSIN,MADISON,WI 53706, USA. NR 6 TC 5 Z9 5 U1 2 U2 2 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP 1158 EP 1162 PN 2 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600138 ER PT J AU BATHKE, CG AF BATHKE, CG TI A COMPARISON OF STEADY-STATE ARIES AND PULSED PULSAR TOKAMAK POWER-PLANTS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 11th Topical Meeting on the Technology of Fusion Energy CY JUN 19-23, 1994 CL NEW ORLEANS, LA AB The multi-institutional ARIES team has completed a series of four steady-state and two pulsed cost-optimized conceptual designs of commercial tokamak fusion power plants. The level of assumed advances in technology and physics was varied from one design to the next. The cost benefits of various design options are compared quantitatively with an emphasis placed on pulsed versus steady-state operation. Possible means to improve the economic competitiveness effusion are suggested. RP BATHKE, CG (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 17 TC 12 Z9 12 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP 1163 EP 1168 PN 2 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600139 ER PT J AU MOIR, RW AF MOIR, RW TI IMPROVEMENTS TO THE HYLIFE-II INERTIAL FUSION POWER-PLANT DESIGN SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 11th Topical Meeting on the Technology of Fusion Energy CY JUN 19-23, 1994 CL NEW ORLEANS, LA AB If the present research program is successful, heavy-ion beams can be used to ignite targets and to produce high gain for yields of about 350 MJ. HYLIFE-II is a power plant design based on surrounding such targets with thick liquid (Flibe, Li2BeF4) so that the chamber and other apparatus can not only stand up to these 350 MJ bursts of energy but do so without replacing components during the plant's 30-year life. The capacity factor will be increased and the cost of component replacement will be decreased. Continuous improvements to the design are being made to increase safety, decrease the generation of radioactive material, and reduce the cost of electricity (COE). Improvements discussed in this paper decreased COE for each effect by the amount in parentheses: increased plant size (22%), increased capacity factor and reduced component replacement (20%), reduced remote maintenance equipment (3.2%), use of non-nuclear grade chamber, pumps and piping (2.9%), reduced tritium inventory by a factor of 2.4, reduced excess tritium production with attendant increase energy release in the blanket (1.8%), corrected treatment of Flibe inventory costs (3.4%). RP MOIR, RW (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-637,LIVERMORE,CA 94551, USA. NR 21 TC 13 Z9 13 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP 1169 EP 1177 PN 2 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600140 ER PT J AU HOUSE, PA AF HOUSE, PA TI HYLIFE-II REACTOR CHAMBER DESIGN REFINEMENTS SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 11th Topical Meeting on the Technology of Fusion Energy CY JUN 19-23, 1994 CL NEW ORLEANS, LA AB Mechanical design features of the reactor chamber for the HYLIFE-II inertial confinement fusion power plant are presented. A combination of oscillating and steady, molten salt streams (Li2BeF4) are used for shielding and blast protection of the chamber walls. The system is designed for a 6 Hz repetition rate. Beam path clearing, between shots, is accomplished with the oscillating flow. The mechanism for generating the oscillating streams is described. A design configuration of the vessel wall allows adequate cooling and provides extra shielding to reduce thermal stresses to tolerable levels. The bottom portion of the reactor chamber is designed to minimize splash back of the high velocity (> 12 m/s) salt streams and also recover up to half of the dynamic head. Cost estimates for a 1 GWe and 2 GWe reactor chamber are presented. RP HOUSE, PA (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 9 TC 19 Z9 19 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP 1178 EP 1195 PN 2 PG 18 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600141 ER PT J AU GALAMBOS, J PENG, YKM HAINES, J AF GALAMBOS, J PENG, YKM HAINES, J TI MINIMUM SIZE Q=1 AND IGNITED SPHERICAL TOKAMAK DEVICES SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 11th Topical Meeting on the Technology of Fusion Energy CY JUN 19-23, 1994 CL NEW ORLEANS, LA AB We find minimum sized Spherical Tokamak (ST) configurations capable of Q similar to 1 (scientific break-even) and ignition. For Q similar to 1 cases, we normalize our models to the JET device. We find comparable plasma power balance performance in an ST configuration of major radius similar to 0.7 m, using both global and 3/2 D plasma transport modeling. For ignited plasma, we first normalize the plasma modeling to the ITER device. We find similar ignited plasma performance capabilities in an ST configuration of major radius 1.2 m. These are much smaller size plasmas than the standard tokamak counterparts, indicating a potentially easier path towards commercial applications. Also, we find that the quantity IA is not a good figure-of-merit for comparing performance of widely different tokamak configurations. RP GALAMBOS, J (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 10 TC 2 Z9 2 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP 1196 EP 1202 PN 2 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600142 ER PT J AU HARTMAN, CW EDDLEMAN, JL MOIR, R SHUMLAK, U AF HARTMAN, CW EDDLEMAN, JL MOIR, R SHUMLAK, U TI THE FLOW-THROUGH Z-PINCH FOR FUSION ENERGY-PRODUCTION SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 11th Topical Meeting on the Technology of Fusion Energy CY JUN 19-23, 1994 CL NEW ORLEANS, LA AB We discuss a high-density fusion reactor which utilizes a flow-through Z pinch magnetic confinement configuration. Assessment of this reactor system is motivated by simplicity and small unit size (few hundred MWe) and immunity to plasma contamination made possible at high density. The type reactor discussed here would employ a liquid Li vortex as the first wall/blanket to capture fusion neutrons with minimum induced radioactivity and to achieve high wall loading and a power density of 200 w/cm(3). C1 USAF,PHILLIPS LAB,WSP,KIRTLAND AFB,NM 87117. RP HARTMAN, CW (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94551, USA. NR 5 TC 2 Z9 2 U1 0 U2 3 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP 1203 EP 1206 PN 2 PG 4 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600143 ER PT J AU KRAKOWSKI, RA CHENG, ET PENG, YKM AF KRAKOWSKI, RA CHENG, ET PENG, YKM TI TOKAMAK TRANSMUTATION OF (NUCLEAR) WASTE (TTW) - PARAMETRIC STUDIES SO FUSION TECHNOLOGY LA English DT Article; Proceedings Paper CT 11th Topical Meeting on the Technology of Fusion Energy CY JUN 19-23, 1994 CL NEW ORLEANS, LA AB Radioactive waste generated as part of the commercial-power and defense nuclear programs can be either stored or transmuted. The latter treatment requires a capital-intensive neutron source and is reserved for particularly hazardous and long-lived actinide and fission-product waste. A comparative description of fusion-based transmutation is made on the basis of rudimentary estimates of energy-balance performance and transmutation capacities versus inventories for both ultralow-aspect-ratio (spherical torus, ST) and conventional (aspect-ratio) tokamak fusion-power-core drivers. The parametric systems studies reported herein provides a preamble to more-detailed, cost-based systems analyses. C1 TSI RES INC,SOLANA BEACH,CA 92075. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP KRAKOWSKI, RA (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 20 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP 1207 EP 1215 PN 2 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600144 ER PT J AU GILLIGAN, JG HOULBERG, WA AF GILLIGAN, JG HOULBERG, WA TI 11TH TOPICAL MEETING ON THE TECHNOLOGY OF FUSION ENERGY SO FUSION TECHNOLOGY LA English DT Editorial Material C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP GILLIGAN, JG (reprint author), N CAROLINA STATE UNIV,RALEIGH,NC 27695, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1994 VL 26 IS 3 BP R15 EP R15 PN 2 PG 1 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PU756 UT WOS:A1994PU75600002 ER PT J AU NELSON, DO SPEED, TP AF NELSON, DO SPEED, TP TI PREDICTING PROGRESS IN DIRECTED MAPPING PROJECTS SO GENOMICS LA English DT Article ID ANCHORING RANDOM CLONES; GENOME AB Several recent mapping efforts have used so-called ''directed'' approaches to construct their maps. However, most, but not all, published methods for modeling the progress in physical mapping projects have been focused on random approaches, such as bottom-up fingerprinting and STS-content mapping. In addition, those few efforts that did model directed approaches used methods that required assuming that all insert lengths were the same. This assumption is unnecessary. Using properties of stationary processes, one can derive simple asymptotic formulas that apply equally to constant and variable clone lengths. Also, in the case of constant clone lengths, these results are equivalent to, and extend, those published results for directed mapping derived by other methods. Simulations show that these methods provide estimates well within the limits of uncertainty inherent in any mapping project. (C) 1994 Academic Press, Inc. C1 UNIV CALIF BERKELEY,DEPT STAT,BERKELEY,CA 94720. RP NELSON, DO (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,BIOL & BIOTECHNOL RES PROGRAM,POB 808,LIVERMORE,CA 94550, USA. RI Speed, Terence /B-8085-2009 OI Speed, Terence /0000-0002-5403-7998 NR 14 TC 2 Z9 2 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0888-7543 J9 GENOMICS JI Genomics PD NOV 1 PY 1994 VL 24 IS 1 BP 41 EP 52 DI 10.1006/geno.1994.1580 PG 12 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA PT473 UT WOS:A1994PT47300007 PM 7896288 ER PT J AU GOODART, SA SIMMONS, AD GRADY, D ROJAS, K MOYZIS, RK LOVETT, M OVERHAUSER, J AF GOODART, SA SIMMONS, AD GRADY, D ROJAS, K MOYZIS, RK LOVETT, M OVERHAUSER, J TI A YEAST ARTIFICIAL CHROMOSOME CONTIG OF THE CRITICAL REGION FOR CRI-DU-CHAT SYNDROME SO GENOMICS LA English DT Article ID PHYSICAL MAP; HUMAN GENOME; LIBRARY; CONSTRUCTION; DNA AB Cri-du-chat is a chromosomal deletion syndrome characterized by partial deletion of the short arm of chromosome 5. The clinical symptoms include growth and mental retardation, microcephaly, hypertelorism, epicanthal folds, hypotonia, and a high-pitched monochromatic cry that is usually considered diagnostic for the syndrome. Recently, a correlation between clinical features and the extent of the chromosome 5 deletions has identified two regions of the short arm that appear to be critical for the abnormal development manifested in this syndrome. Loss of a small region in 5p15.2 correlates with all of the clinical features of cri-du-chat with the exception of the cat-like cry, which maps to 5p15.3. Here we report the construction of a YAC contig that spans the chromosomal region in 5p15.2 that plays a major role in the etiology of the cri-duchat syndrome. YACs that span the 2-Mb cri-du-chat critical region have been identified and characterized. This YAC contig lays the groundwork for the construction of a transcriptional map of this region and the eventual identification of genes involved in the clinical features associated with the cri-du-chat syndrome. It also provides a new diagnostic tool for cri-du-chat in the shape of a YAC clone that may span the entire critical region. (C) 1994 Academic Press, Inc. C1 THOMAS JEFFERSON UNIV, DEPT BIOCHEM & MOLEC BIOL, PHILADELPHIA, PA 19107 USA. UNIV TEXAS, SW MED CTR, MCDERMOTT CTR, DALLAS, TX 75235 USA. LOS ALAMOS NATL LAB, CTR HUMAN GENOME STUDIES, LOS ALAMOS, NM 87545 USA. FU NHGRI NIH HHS [HG0237] NR 24 TC 23 Z9 23 U1 0 U2 1 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0888-7543 EI 1089-8646 J9 GENOMICS JI Genomics PD NOV 1 PY 1994 VL 24 IS 1 BP 63 EP 68 DI 10.1006/geno.1994.1582 PG 6 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA PT473 UT WOS:A1994PT47300009 PM 7896290 ER PT J AU MARTELLO, DV VECCHIO, KS DIEHL, JR GRAHAM, RA TAMILIA, JP POLLACK, SS AF MARTELLO, DV VECCHIO, KS DIEHL, JR GRAHAM, RA TAMILIA, JP POLLACK, SS TI DO DISLOCATIONS AND STACKING-FAULTS INCREASE THE OXIDATION RATE OF PYRITES SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID DISSOLUTION KINETICS; DENSITY AB XPS, SEM, and TEM studies were made on coal, non-coal, and shock-loaded pyrites that had been experimentally weathered under high relative humidity. Reactivity (oxidation) of the different pyrite samples may be related to their stacking fault densities. A coal pyrite sample that had the highest stacking fault concentration was also the most reactive pyrite. No systematic relationship between reactivity and dislocation density was observed. Shock-loaded samples exposed to mean bulk shock temperatures between 175 and 475 degrees C showed an increase in the number of reactive sites and shock-loaded samples exposed to mean bulk shock temperatures between 500 and 700 degrees C showed decreases in the number of reactive sites. C1 US DOE,PITTSBURGH ENERGY TECHNOL CTR,PITTSBURGH,PA 15236. UNIV CALIF SAN DIEGO,DEPT APPL MECH & ENGN SCI,LA JOLLA,CA 92093. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 21 TC 13 Z9 13 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD NOV PY 1994 VL 58 IS 21 BP 4657 EP 4665 DI 10.1016/0016-7037(94)90198-8 PG 9 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA PT017 UT WOS:A1994PT01700010 ER PT J AU VAIRAVAMURTHY, A ZHOU, WQ EGLINTON, T MANOWITZ, B AF VAIRAVAMURTHY, A ZHOU, WQ EGLINTON, T MANOWITZ, B TI SULFONATES - A NOVEL CLASS OF ORGANIC SULFUR-COMPOUNDS IN MARINE-SEDIMENTS SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID NEAR-EDGE STRUCTURE; STRUCTURE SPECTROSCOPY; BACTERIA; COAL; IDENTIFICATION; POLYSULFIDES; GEOCHEMISTRY; DIAGENESIS; SULFATE; MATTER AB X-ray absorption near-edge structure spectroscopy (XANES) used to measure sulfur speciation in a variety of organic-rich marine sediments has established sulfonates as a novel and major component of sedimentary organic sulfur. The origins of sulfonates in sediments are not clear, although both biological and geochemical mechanisms are possible. The accumulation of oxidized sulfonate sulfur in reducing marine sediments was not known previously; hence, a new perspective in sulfur geochemistry is established. C1 WOODS HOLE OCEANOG INST,DEPT MARINE CHEM & GEOCHEM,WOODS HOLE,MA 02543. RP VAIRAVAMURTHY, A (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,GEOCHEM PROGRAM,UPTON,NY 11973, USA. NR 40 TC 103 Z9 104 U1 0 U2 13 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD NOV PY 1994 VL 58 IS 21 BP 4681 EP 4687 DI 10.1016/0016-7037(94)90200-3 PG 7 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA PT017 UT WOS:A1994PT01700012 ER PT J AU ZANDT, G VALASCO, AA BECK, SL AF ZANDT, G VALASCO, AA BECK, SL TI COMPOSITION AND THICKNESS OF THE SOUTHERN ALTIPLANO CRUST, BOLIVIA SO GEOLOGY LA English DT Article ID CENTRAL ANDEAN PLATEAU; UPPER MANTLE STRUCTURE; SEISMIC VELOCITIES; SUBDUCTION ZONES; DISCONTINUITIES; BENEATH AB Slant stacking of broadband seismograms recorded in the western United States for two 1993 intermediate-depth earthquakes that occurred near the Bolivia-Argentina-Chile borders reveals small but clear precursors to both the compressional (P) wave and shear (S) wave depth phases. We interpret and model these precursors as underside reflections from the thickened Andean Altiplano crust. We model the crustal structure of the Altiplano with a grid-search technique to match the timing and amplitudes of the depth phases and precursors in the waveforms of both the P wave and S wave. Our best-fit model has an average crustal velocity of 5.9-6.0 km/s, a crustal V(p)/V(s) of 1.6, a crustal thickness of 75-80 km, and a high-velocity (V(p) = 8.4 km/s), high-V(p)/V(s) (1.9) mantle wedge. Assuming isotropy, the low V(p)/V(s) ratio of 1.6 for the crust corresponds to an anomalously low Poisson's ratio of 0.18. Such a low value, in conjunction with the low average V(p) estimate, is consistent only with a felsic composition and high upper-crustal temperatures. The finding of a thick felsic crust overlying a high-velocity mantle supports models of Altiplano uplift due predominantly to crustal shortening as opposed to mafic magmatic addition and is inconsistent with recent mantle delamination. C1 UNIV ARIZONA,SO ARIZONA SEISMOL OBSERV,TUCSON,AZ 85721. UNIV ARIZONA,DEPT GEOSCI,TUCSON,AZ 85721. RP ZANDT, G (reprint author), LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94551, USA. NR 19 TC 87 Z9 88 U1 0 U2 4 PU GEOLOGICAL SOC AMERICA PI BOULDER PA PO BOX 9140 3300 PENROSE PLACE, BOULDER, CO 80301 SN 0091-7613 J9 GEOLOGY JI Geology PD NOV PY 1994 VL 22 IS 11 BP 1003 EP 1006 DI 10.1130/0091-7613(1994)022<1003:CATOTS>2.3.CO;2 PG 4 WC Geology SC Geology GA PP790 UT WOS:A1994PP79000011 ER PT J AU ROTMENSCH, J WHITLOCK, JL CULBERTSON, S ATCHER, RW SCHWARTZ, JL AF ROTMENSCH, J WHITLOCK, JL CULBERTSON, S ATCHER, RW SCHWARTZ, JL TI COMPARISON OF SENSITIVITIES OF CELLS TO X-RAY THERAPY, CHEMOTHERAPY, AND ISOTOPE THERAPY USING A TUMOR SPHEROID MODEL SO GYNECOLOGIC ONCOLOGY LA English DT Article ID OVARIAN-CARCINOMA AB Numerous treatment modalities have been used in treating microscopic carcinoma confined to the peritoneal cavity. However, there is little information at the cellular level regarding which modality is most effective in eradicating small nests of tumor cells. In order to determine whether chemotherapy, X rays, or isotope therapy is most effective, we have compared in a three-dimensional spheroid model the survival of cells after treatment with cts-platinum, X ray, or the investigational high-energy isotope 212-bismuth (Bi-212). In this study, V-79 cells were grown to 100-mu m diameter spheroids. In killing spheroids, high-energy isotopes were at least six times more effective than X rays at fractionated doses of up to 1300 cGy. High-energy isotopes appear also to be as efficient as cis-platinum. Regardless of exposure time to treatment, Bi-212 was more toxic to spheroids than the other treatment modalities. From this study we conclude that high-energy isotope therapy biologically is very effective in eradicating microscopic nests of cells. (C) 1994 Academic Press, Inc. C1 UNIV CHICAGO,DEPT RADIAT ONCOL,CHICAGO,IL 60637. ARGONNE NATL LAB,DEPT CHEM & BIOL,ARGONNE,IL 60439. RP ROTMENSCH, J (reprint author), UNIV CHICAGO,DEPT OBSTET & GYNECOL,CHICAGO,IL 60637, USA. OI Atcher, Robert/0000-0003-4656-2247 NR 13 TC 3 Z9 4 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0090-8258 J9 GYNECOL ONCOL JI Gynecol. Oncol. PD NOV PY 1994 VL 55 IS 2 BP 290 EP 293 DI 10.1006/gyno.1994.1292 PG 4 WC Oncology; Obstetrics & Gynecology SC Oncology; Obstetrics & Gynecology GA PU547 UT WOS:A1994PU54700023 PM 7959298 ER PT J AU FILIPY, RE KATHREN, RL MCINROY, JF SHORT, RA AF FILIPY, RE KATHREN, RL MCINROY, JF SHORT, RA TI SOFT-TISSUE CONCENTRATIONS OF PLUTONIUM AND AMERICIUM IN OCCUPATIONALLY-EXPOSED HUMANS SO HEALTH PHYSICS LA English DT Article DE EXPOSURE, OCCUPATIONAL; AM-241; PLUTONIUM; TISSUE, BODY ID STATES TRANS-URANIUM; REGISTRY REPORT; AM-241 CONTENT; SPECIAL ISSUE; WHOLE-BODY AB Human tissues, obtained at autopsy from 82 volunteer donors with a history of occupational exposure, were analyzed for Pu-238, Pu-239+240, and Am-241 by chemical separation and subsequent alpha spectrometry. Concentrations of these actinide nuclides in soft tissues (testes, thyroid gland, spleen, kidneys, heart, and skeletal muscle) were compared to those of the livers in the same subjects. Tissue:liver concentration ratios were essentially constant over a wide range of liver concentrations. The spleen had consistently high actinide concentrations relative to liver; however, the heart had the greatest concentration ratio for Am-241. Testes had relatively high concentration ratios of the plutonium nuclides but low concentrations of Am-241. Skeletal muscle had low concentrations of plutonium relative to liver but high concentrations of Am-241. In the tissues studied, concentration ratios of Am-241 were greater than those of the plutonium nuclides, most likely a result of more rapid excretion of that nuclide than the plutonium nuclides by the liver. C1 LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RP FILIPY, RE (reprint author), WASHINGTON STATE UNIV, US TRANSURANIUM & URANIUM REGISTRIES, TRI CITIES, 100 SPROUT RD, RICHLAND, WA 99352 USA. RI WSU, USTUR/I-1056-2013 NR 23 TC 7 Z9 7 U1 0 U2 1 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD NOV PY 1994 VL 67 IS 5 BP 477 EP 485 DI 10.1097/00004032-199411000-00003 PG 9 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 PM831 UT WOS:A1994PM83100009 PM 7928359 ER PT J AU JONES, TD MORRIS, MD YOUNG, RW AF JONES, TD MORRIS, MD YOUNG, RW TI DOSE-RATE RBE FACTORS FOR PHOTONS - HEMATOPOIETIC SYNDROME IN HUMANS VS STROMAL CELL CYTOPENIA SO HEALTH PHYSICS LA English DT Article DE RELATIVE BIOLOGICAL EFFECTIVENESS; PHOTONS; BONE MARROW; DOSE ID RADIATION-INDUCED MYELOPOIESIS; CARCINOGENIC RISK ASSESSMENTS; UNIFYING CONCEPT; MICE; MODEL; IRRADIATIONS; EXPOSURE; KINETICS; DEATH AB Traditionally, dose-response modeling has been on a strict experiment-by-experiment basis. Such an approach greatly restricts understanding of complex biological systems affected by numerous confounding factors that individually vary from experiment to experiment. In contrast, work described in this manuscript relies on a new analytical process (that considers both pooled and experiment-specific considerations) that was used to jointly analyze the bone marrow cell kinetics from a large data base on six species of test animals irradiated by protracted schedules of ionizing photon radiations. From this approach, we have modeled how the human LD(50) may vary with dose protraction and how the dose rate efficiency or RBE factors for x rays, Cs-137, and Co-60 change for irradiations given at constant rate over one minute, hour, day, week, and month. C1 OAK RIDGE NATL LAB, DIV ENGN PHYS & MATH, OAK RIDGE, TN 37831 USA. DEF NUCL AGCY, RADIAT POLICY OFF, WASHINGTON, DC 20305 USA. RP JONES, TD (reprint author), OAK RIDGE NATL LAB, DIV HLTH SCI RES, BLDG 4500-S MS 6101, POB 2008, OAK RIDGE, TN 37831 USA. NR 25 TC 7 Z9 7 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD NOV PY 1994 VL 67 IS 5 BP 495 EP 508 DI 10.1097/00004032-199411000-00005 PG 14 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 PM831 UT WOS:A1994PM83100011 PM 7928361 ER PT J AU MAHERAS, SJ RITTER, PD LEONARD, PR MOORE, R AF MAHERAS, SJ RITTER, PD LEONARD, PR MOORE, R TI BENCHMARKING OF THE CAP-88 AND GENII COMPUTER CODES USING 1990 AND 1991 MONITORED ATMOSPHERIC RELEASES FROM THE IDAHO-NATIONAL-ENGINEERING-LABORATORY SO HEALTH PHYSICS LA English DT Article DE ENVIRONMENTAL ASSESSMENT; COMPUTER CALCULATIONS; ENVIRONMENTAL TRANSPORT; MODELING, DOSE ASSESSMENT ID FOOD-CHAIN MODEL; RADIONUCLIDE INGESTION; PATHWAY; PREDICTIONS AB The CAP-88 environmental radiological assessment computer code was benchmark tested to establish confidence in its results. The results from CAP-88 were compared to the results from the GENII computer code, which has undergone rigorous testing. The codes were benchmarked using 1990 and 1991 monitored atmospheric releases from Idaho National Engineering Laboratory facilities and the results (the effective dose equivalent to the maximally exposed offsite individual) were quantitatively compared using a metric based on the uncertainty in the Gaussian plume model and terrestrial transport models. The results of the benchmark tests were within the 95% acceptance region specified in the test protocol. CAP-88 was found to overpredict effective dose equivalent relative to GENII for elevated releases, largely because CAP-88 calculates a larger atmospheric dispersion factor (chi/Q) than does GENII using the same meteorological data. However, CAP-88 consistently underpredicted effective dose equivalent relative to GENII for ground-level releases. This was because CAP-88 accounts for the processes of plume depletion by dry and wet deposition while GENII does not account for these processes. The effect of depletion was tested and found to be most important for a ground-level release of a highly depositing species such as radioiodine which implies that acceptable benchmark results would be difficult to obtain for a highly depositing species. C1 EG&G IDAHO INC, IDAHO NATL ENGN LAB, IDAHO FALLS, ID 83415 USA. US DOE, RADIOL & ENVIRONM SCI LAB, IDAHO FALLS, ID 83402 USA. RP MAHERAS, SJ (reprint author), SCI APPLICAT INT CORP, 545 SHOUP AVE, IDAHO FALLS, ID 83402 USA. NR 50 TC 3 Z9 3 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD NOV PY 1994 VL 67 IS 5 BP 509 EP 517 DI 10.1097/00004032-199411000-00006 PG 9 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 PM831 UT WOS:A1994PM83100012 PM 7928362 ER PT J AU NEUHAUSEN, SL SWENSEN, J MIKI, Y LIU, Q TAVTIGIAN, S SHATTUCKEIDENS, D KAMB, A HOBBS, MR GINGRICH, J SHIZUYA, H KIM, UJ COCHRAN, C FUTREAL, PA WISEMAN, RW LYNCH, HT TONIN, P NAROD, S CANNONALBRIGHT, L SKOLNICK, MH GOLDGAR, DE AF NEUHAUSEN, SL SWENSEN, J MIKI, Y LIU, Q TAVTIGIAN, S SHATTUCKEIDENS, D KAMB, A HOBBS, MR GINGRICH, J SHIZUYA, H KIM, UJ COCHRAN, C FUTREAL, PA WISEMAN, RW LYNCH, HT TONIN, P NAROD, S CANNONALBRIGHT, L SKOLNICK, MH GOLDGAR, DE TI A P1-BASED PHYSICAL MAP OF THE REGION FROM D17S776 TO D17S78 CONTAINING THE BREAST-CANCER SUSCEPTIBILITY GENE BRCA1 SO HUMAN MOLECULAR GENETICS LA English DT Article ID YEAST ARTIFICIAL CHROMOSOMES; HUNTINGTON DISEASE REGION; FAMILIAL BREAST; OVARIAN-CANCER; DNA; CLONING; LIBRARY; CONSTRUCTION; LINKAGE; CONTIG AB BRCA1, a breast and ovarian cancer susceptibility locus, has been isolated and maps to 17q21. A physical map of the BRCA1 region which extended from the proximal boundary at D17S776 to the distal boundary at D17S78 was constructed and consists of 51 sequence tagged sites (STSs) from P1 and YAC ends, nine new short-tandem repeat (STR) polymorphic markers, and eight identified genes. The contig, which spans the estimated 2.3 Mb region, contains 29 P1s, 11 YACs, two BACs, and one cosmid. Based on key recombinants in two linked families, BRCA1 was further localized to a region bounded by D17S1321 on the proximal side and D17S1325 on the distal side. Within this estimated 600 kb region, the contig was composed completely of P1s and BACs ordered by STS-content mapping and confirmed by DNA restriction fragment fingerprinting. C1 UNIV UTAH,MED CTR,DEPT HUMAN GENET,SALT LAKE CITY,UT 84132. UNIV UTAH,MED CTR,DEPT INTERNAL MED,SALT LAKE CITY,UT 84132. MYRIAD GENET INC,SALT LAKE CITY,UT 84108. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR HUMAN GENOME,BERKELEY,CA 94720. CALTECH,DIV BIOL,147-75,PASADENA,CA 91125. NIEHS,MOLEC CARCINOGENESIS LAB,RES TRIANGLE PK,NC 27709. CREIGHTON UNIV,DEPT PREVENT MED,OMAHA,NE. MCGILL UNIV,DEPT MED GENET,MONTREAL,PQ,CANADA. RP NEUHAUSEN, SL (reprint author), UNIV UTAH,MED CTR,DEPT MED INFORMAT,SALT LAKE CITY,UT 84132, USA. OI albright, lisa/0000-0003-2602-3668 FU NCI NIH HHS [CA-48711, CA-55914] NR 34 TC 64 Z9 64 U1 0 U2 1 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0964-6906 J9 HUM MOL GENET JI Hum. Mol. Genet. PD NOV PY 1994 VL 3 IS 11 BP 1919 EP 1926 DI 10.1093/hmg/3.11.1919 PG 8 WC Biochemistry & Molecular Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Genetics & Heredity GA PT231 UT WOS:A1994PT23100001 PM 7874107 ER PT J AU BURKS, C AF BURKS, C TI DNA-SEQUENCE ASSEMBLY SO IEEE ENGINEERING IN MEDICINE AND BIOLOGY MAGAZINE LA English DT Article ID LARGE-SCALE; ALGORITHMS; PROGRAM RP BURKS, C (reprint author), LOS ALAMOS NATL LAB,LANSCE ER,MS K710,LOS ALAMOS,NM 87545, USA. NR 16 TC 5 Z9 5 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0739-5175 J9 IEEE ENG MED BIOL JI IEEE Eng. Med. Biol. Mag. PD NOV-DEC PY 1994 VL 13 IS 5 BP 771 EP 773 DI 10.1109/51.334645 PG 3 WC Engineering, Biomedical; Medical Informatics SC Engineering; Medical Informatics GA PT581 UT WOS:A1994PT58100024 ER PT J AU RICHIE, DA ZHANG, T CHOQUETTE, KD LEIBENGUTH, RE ZACHMAN, JC TABATABAIE, N AF RICHIE, DA ZHANG, T CHOQUETTE, KD LEIBENGUTH, RE ZACHMAN, JC TABATABAIE, N TI CHAOTIC DYNAMICS OF MODE COMPETITION IN A VERTICAL-CAVITY SURFACE-EMITTING LASER-DIODE UNDER DC EXCITATION SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID STRANGE ATTRACTORS; POLARIZATION; REFLECTORS AB We discuss the dynamics of transverse mode competition in an etched air-post vertical-cavity laser diode under dc excitation using an annular ring contact as a spatial filter. Distinct regions of operation are found for various ranges of fixed bias currents. At 1.5 times threshold, the device enters a region which exhibits chaotic fluctuations between the fundamental and a higher order lasing mode. The dynamics of these fluctuations are studied using the method of delays, and a calculation of the power spectrum and the correlation dimension are reported. It is found that the dynamics of the choatic fluctuations have a correlation dimension of approximately 2.8. The results are indicative of a low-dimensional strange attractor underlying the modal competition noise. C1 AT&T BELL LABS,BREINIGSVILLE,PA 18031. UNIV WISCONSIN,DEPT ELECT & COMP ENGN,MADISON,WI 53706. SANDIA NATL LABS,TECH STAFF,ALBUQUERQUE,NM 87185. NR 18 TC 14 Z9 15 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD NOV PY 1994 VL 30 IS 11 BP 2500 EP 2506 DI 10.1109/3.333701 PG 7 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA PT162 UT WOS:A1994PT16200009 ER PT J AU RAO, NSV TOIDA, S AF RAO, NSV TOIDA, S TI ON POLYNOMIAL-TIME TESTABLE COMBINATIONAL-CIRCUITS SO IEEE TRANSACTIONS ON COMPUTERS LA English DT Article DE TEST GENERATION; COMBINATIONAL CIRCUITS; POLYNOMIAL-TIME TESTABILITY; NP-COMPLETENESS ID TEST-GENERATION; ALGORITHMS AB The problems of identifying several nontrivial classes of Polynomial-Time Testable (PTT) circuits are shown to be NP-complete or harder. First, PTT classes obtained by using circuit decompositions proposed by Fujiwara and Chakradhar et al. are considered. Another type of decompositions, based on fanout-reconvergent (f-r) pairs, which also lead to PTT classes are proposed. The problems of obtaining these decompositions, and also some structurally similar general graph decompositions, are shown to be NP-complete or harder. Then, the problems of recognizing PTT classes formed by the Boolean formulae belonging to the weakly positive, weakly negative, bijunctive and affine classes (proposed by Schaefer) are shown to be NP-complete. RP RAO, NSV (reprint author), OAK RIDGE NATL LAB,CTR ENGN SYST ADV RES,OAK RIDGE,TN 37831, USA. OI Rao, Nageswara/0000-0002-3408-5941 NR 20 TC 1 Z9 1 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0018-9340 J9 IEEE T COMPUT JI IEEE Trans. Comput. PD NOV PY 1994 VL 43 IS 11 BP 1298 EP 1308 DI 10.1109/12.324562 PG 11 WC Computer Science, Hardware & Architecture; Engineering, Electrical & Electronic SC Computer Science; Engineering GA PK414 UT WOS:A1994PK41400005 ER PT J AU SCOFIELD, JH BORLAND, N FLEETWOOD, DM AF SCOFIELD, JH BORLAND, N FLEETWOOD, DM TI RECONCILIATION OF DIFFERENT GATE-VOLTAGE DEPENDENCIES OF 1/F NOISE IN N-MOS AND P-MOS TRANSISTORS SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article ID INTERFACE TRAPS; FLICKER NOISE; MOSFETS; DEFECTS; DEVICES AB We have examined the 1/f noise of 3 mum x 16 mum, n- and p-MOS transistors as a function of frequency (f), gate-voltage (V(g)), and temperature (T). Measurements were performed for 3 Hz less-than-or-equal-to f less-than-or-equal-to 50 kHz, 100 mV less-than-or-equal-to \V(g) - V(th) \less-than-or-equal-to 4 V, and 77 K less-than-or-equal-to T less-than-or-equal-to 300 K, where V(th) is the threshold voltage. Devices were operated in strong inversion in their linear regimes. At room temperature we find that, for n-MOS transistors, S(V)d is-proportional-to V(d)2/(V(g) - V(th))2, and for p-MOS transistors, we generally find that S(V)d is-proportional-to V(d)2/(V(g) - V(th)), consistent with trends reported by others. At lower temperatures, however, the results can be very different. In fact, we find that the temperature dependence of the noise and the gate-voltage dependence of the noise show similar features, consistent with the idea that the noise at a given T and V(g) is determined by the trap density, D(t)(E), at trap energies E = E(T,V(g)). Both the T- and V(g)-dependencies of the noise imply that D(t)(E) tends to be constant near the silicon conduction band edge, but increases as E approaches the valence band edge. It is evidently these differences in D(t(E) that lead to differences in the gate-voltage dependence of the noise commonly observed at room temperature for n- and p-MOS transistors. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP SCOFIELD, JH (reprint author), OBERLIN COLL,DEPT PHYS,OBERLIN,OH 44074, USA. NR 28 TC 58 Z9 58 U1 0 U2 7 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD NOV PY 1994 VL 41 IS 11 BP 1946 EP 1952 DI 10.1109/16.333810 PG 7 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA PT160 UT WOS:A1994PT16000007 ER PT J AU FLEETWOOD, DM MEISENHEIMER, TL SCHOFIELD, JH AF FLEETWOOD, DM MEISENHEIMER, TL SCHOFIELD, JH TI 1/F NOISE AND RADIATION EFFECTS IN MOS DEVICES SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Review ID OXIDE-SEMICONDUCTOR DEVICES; FIELD-EFFECT TRANSISTORS; INTERFACE STATE DENSITY; SIO2 THIN-FILMS; X-RAY; TRAPPED CHARGE; POINT-DEFECTS; SI-SIO2 INTERFACE; POSITIVE CHARGE; FLICKER NOISE AB An extensive comparison of the 1/f noise and radiation response of MOS devices is presented. Variations in the room-temperature 1/f noise of unirradiated transistors in the linear regime of device operation correlate strongly with variations in postirradiation threshold-voltage shifts due to oxide-trap charge. A simple number fluctuation model has been developed to semi-quantitatively account for this correlation. The 1/f noise of irradiated n-channel MOS transistors increases during irradiation with increasing oxide-trap charge and decreases during postirradiation positive-bias annealing with decreasing oxide-trap charge. No such correlation is found between low-frequency 1/f noise and interface-trap charge. The noise of irradiated p-channel MOS transistors also increases during irradiation, but in contrast to the n-channel response, the p-channel transistor noise magnitude increases during positive-bias annealing with decreasing oxide-trap charge. A qualitative model involving the electrostatic charging and discharging of border traps, as well as accompanying changes in trap energy, is developed to account for this difference in n- and p-channel postirradiation annealing response. The correlation between the low-frequency 1/f noise of unirradiated devices and their postirradiation oxide-trap charge suggests noise measurements can be used as a nondestructive screen of oxide-trap charge related failures in discrete MOS devices and for small scale circuits in which critical transistors can be isolated. It also suggests that process techniques developed to reduce radiation-induced-hole trapping in MOS devices can be applied to reduce the low-frequency 1/f noise of MOS circuits and devices. In particular, reducing the number of oxygen vacancies and vacancy complexes in the SiO2 can significantly reduce the 1/f noise of MOS devices both in and outside a radiation environment. Optimized radiation-hardened MOSFET's can show preirradiation noise magnitudes approaching the low levels of bulk silicon and JEET's and postirradiation noise levels significantly below those of commercial nonradiation-hardened devices. C1 OBERLIN COLL, DEPT PHYS, OBERLIN, OH 44074 USA. RP SANDIA NATL LABS, DEPT RADIAT TECHNOL & ASSURANCE, ALBUQUERQUE, NM 87185 USA. NR 114 TC 120 Z9 123 U1 2 U2 26 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9383 EI 1557-9646 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD NOV PY 1994 VL 41 IS 11 BP 1953 EP 1964 DI 10.1109/16.333811 PG 12 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA PT160 UT WOS:A1994PT16000008 ER PT J AU DUAN, SL ZHANG, B GAO, CA RAUCH, GC PRESSESKY, JL SCHWARTZ, A AF DUAN, SL ZHANG, B GAO, CA RAUCH, GC PRESSESKY, JL SCHWARTZ, A TI A STUDY OF MAGNETIC RECORDING MEDIA ON GLASS SUBSTRATES SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 6th Joint Magnetism and Magnetic Materials-Intermag Conference CY JUN 20-23, 1994 CL ALBUQUERQUE, NM SP AMER INST PHYS, IEEE, MAGNET SOC, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID RIGID-DISK APPLICATIONS; NOISE AB Magnetic media deposited on glass substrates with metal seedlayer, Cr underlayer and CoCrPtTa alloy were studied. Within each group of samples, although the bulk magnetic properties were made to be similar, the media noise differed significantly; microstructural study indicated that the grain sizes of the magnetic layers were similar. X-ray diffraction study indicated that the magnetic layer was mostly {10.0} textured, with some [00.2] and [10.1] oriented grains also present. A correlation was observed between stronger CoCrPtTa {00.2} diffraction peak and lower media noise; the Cr {200} peak in the lower noise media was also much weaker. The different crystallographic tenture is likely promoted by the surface condition of the seedlayer; larger number of [00.2] grains within the mostly {10.0} textured magnetic layer may suppress the formation of large coherently-magnetized regions in the zig-zag transitions, which would result in lower media noise. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP DUAN, SL (reprint author), SEAGATE MAGNET,47010 KATO RD,FREMONT,CA 94538, USA. NR 14 TC 6 Z9 7 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1994 VL 30 IS 6 BP 3966 EP 3968 DI 10.1109/20.333959 PN 1 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA PU429 UT WOS:A1994PU42900056 ER PT J AU JILES, DC AF JILES, DC TI MODELING THE EFFECTS OF EDDY-CURRENT LOSSES ON FREQUENCY-DEPENDENT HYSTERESIS IN ELECTRICALLY CONDUCTING MEDIA SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 6th Joint Magnetism and Magnetic Materials-Intermag Conference CY JUN 20-23, 1994 CL ALBUQUERQUE, NM SP AMER INST PHYS, IEEE, MAGNET SOC, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID FERROMAGNETIC HYSTERESIS; POWER LOSSES AB In recent studies it has been shown how the effects of classical eddy current losses can be used to extend the quasi-static hysteresis model to account for the frequency dependence of hysteresis in electrically conducting media. This paper deals with the extension of the hysteresis model to include anomalous or excess losses. The instantaneous power loss due to eddy currents then consists of two terms, one of which depends on (dB/dt)(2) and the other one on (dB/dt)(1.5). The first term is the classical power Loss anti the second term, due to Bertotti, is the excess power loss. It is shown how these terms are incorporated into a time dependent hysteresis model. The main achievement is that a self-consistent model of hysteresis has been developed in which the quasi-static hysteresis curves are shown to be a limiting case of the more general frequency dependent model. RP JILES, DC (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Jiles, David/H-9548-2012 NR 11 TC 89 Z9 103 U1 0 U2 14 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1994 VL 30 IS 6 BP 4326 EP 4328 DI 10.1109/20.334076 PN 1 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA PU429 UT WOS:A1994PU42900173 ER PT J AU WANG, XD ANTROPOV, VP HARMON, BN AF WANG, XD ANTROPOV, VP HARMON, BN TI FIRST PRINCIPLES STUDY OF MAGNETOOPTICAL PROPERTIES OF HALF METALLIC HEUSLER ALLOYS - NIMNSB AND PTMNSB SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 6th Joint Magnetism and Magnetic Materials-Intermag Conference CY JUN 20-23, 1994 CL ALBUQUERQUE, NM SP AMER INST PHYS, IEEE, MAGNET SOC, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID FERROMAGNETS AB Within the local spin density approximation (LSD) of density functional theory, calculations of both the diagonal and off-diagonal conductivity of NiMnSb and PtMnSb are presented. The similar electronic structures of these two materials yield similar diagonal conductivities while the larger spill-orbit coupling of Pt than that of Ni results in a larger off-diagonal conductivity for PtMnSb than for NiMnSb. As a result, a larger Kerr rotation for PtMnSb is found. Quantitatively we found fair agreement between the theoretical and the experimental MOKE spectra. The discrepancy between the theory and the experiment in some details, particularly in the case of PtMnSb, is attributed to the inaccuracy in theory to give the correct plasma resonant edge, hence suggesting that a more accurate description of the energy bands such as including quasiparticle self energy corrections is required. C1 IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS & ASTRON, AMES, IA 50011 USA. RP WANG, XD (reprint author), IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. NR 9 TC 26 Z9 26 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1994 VL 30 IS 6 BP 4458 EP 4460 DI 10.1109/20.334120 PN 1 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA PU429 UT WOS:A1994PU42900216 ER PT J AU SIPAHI, LB AF SIPAHI, LB TI INFLUENCE OF DC BIAS FIELD, EXCITATION AND DETECTION FREQUENCIES ON MAGNETIC BARKHAUSEN NOISE-ANALYSIS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 6th Joint Magnetism and Magnetic Materials-Intermag Conference CY JUN 20-23, 1994 CL ALBUQUERQUE, NM SP AMER INST PHYS, IEEE, MAGNET SOC, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID HYSTERESIS AB The micromagnetic Barkhausen emissions, widely known as Barkhausen noise, are quite dependent on excitation and detection frequencies. The input variables to generate these emissions are amplitude, wave form and frequency of magnetic excitation field. When a DC bias fieId is coupled with an AC magnetic field, this compIex excitation give rises to distortion of the magnetic hysteresis loop. Recent work showed the frequency dependence of hysteresis curves in ferromagmetic materials. Since there is a strong correlation between the location on the BII loop and Barkhausen, comprehending the magnetization mechanisms at each location is essential. The current investigation indicated significant changes in voltage wave forms, pulse height spectra, frequency spectra and RMS voltages of magnetic Barkhausen noise in magnetic materials with different DC bias fields, detection and excitation frequencies. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT ELECT ENGN & COMP ENGN,AMES,IA 50011. RP SIPAHI, LB (reprint author), IOWA STATE UNIV SCI & TECHNOL,CTR ADV TECHNOL & DEV,AMES LAB,AMES,IA 50011, USA. NR 7 TC 0 Z9 0 U1 1 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1994 VL 30 IS 6 BP 4590 EP 4592 DI 10.1109/20.334158 PN 1 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA PU429 UT WOS:A1994PU42900256 ER PT J AU GAO, Z CHEN, ZJ JILES, DC BINER, S AF GAO, Z CHEN, ZJ JILES, DC BINER, S TI VARIATION OF COERCIVITY OF FERROMAGNETIC MATERIAL DURING CYCLIC STRESSING SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 6th Joint Magnetism and Magnetic Materials-Intermag Conference CY JUN 20-23, 1994 CL ALBUQUERQUE, NM SP AMER INST PHYS, IEEE, MAGNET SOC, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID NICKEL; STEEL AB The relationship between coercivity and the number of stress cycles is reported in this paper. The linear relation between coercivity and the logarithm of the number of stress cycles was confirmed in load controlled fatigue tests, for both pre-strained and unprestrained specimens. It is believed that the dislocation activity is the main factor changing the magnetic properties of a ferromagnetic material under fatigue, rather than other microstructures and internal stress. As a result, a theoretical model was developed to explain the correlation between the coercivity and the number of stress cycles. The model is based on domain wall dislocation interaction and the strain-dislocation relation. We predict the relation between magnetic properties and the stage of fatigue life as Hc-Hc(0)= b ln(N), where Hc - Hc(0) is the change in coercivity, N is the number of stress cycles and b is a constant. RP GAO, Z (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 14 TC 4 Z9 4 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1994 VL 30 IS 6 BP 4593 EP 4595 DI 10.1109/20.334159 PN 1 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA PU429 UT WOS:A1994PU42900257 ER PT J AU CHEN, ZJ GOVINDARAJU, MR JILES, DC BINER, SB SABLIK, MJ AF CHEN, ZJ GOVINDARAJU, MR JILES, DC BINER, SB SABLIK, MJ TI ASSESSMENT OF CREEP DAMAGE OF FERROMAGNETIC MATERIAL USING MAGNETIC INSPECTION SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 6th Joint Magnetism and Magnetic Materials-Intermag Conference CY JUN 20-23, 1994 CL ALBUQUERQUE, NM SP AMER INST PHYS, IEEE, MAGNET SOC, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID HYSTERESIS; STRESS AB Results of inspection creep damage by magnetic hysteresis measurements on Cr-Mo steel are presented. It is shown that structure sensitive parameters such as coercivity, remanence and hysteresis loss are sensitive to the creep damage. Previous metallographic studies have shown that creep changes the microstructure of the material by introducing voids, dislocations, and grain boundary cavities. As cavities develop, dislocations and voids move out to the grain boundaries; therefore the total pinning sources for domain wall motion are reduced. This, together with the introduction of a demagnetization field due to the cavities, results in the decrease of both coercivity and remanence. Numerical computations with a modified JiIes-Atherton model are presented which are consistent with the proposed mechanisms. C1 IOWA STATE UNIV SCI & TECHNOL,CTR NDE,AMES,IA 50011. SW RES INST,SAN ANTONIO,TX 78228. RP CHEN, ZJ (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Jiles, David/H-9548-2012 NR 9 TC 16 Z9 16 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1994 VL 30 IS 6 BP 4596 EP 4598 DI 10.1109/20.334160 PN 1 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA PU429 UT WOS:A1994PU42900258 ER PT J AU SIPAHI, LB AF SIPAHI, LB TI EFFECTS OF CREEP DAMAGE, SHOT PEENING, AND CASE HARDENING ON MAGNETIC BARKHAUSEN NOISE-ANALYSIS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 6th Joint Magnetism and Magnetic Materials-Intermag Conference CY JUN 20-23, 1994 CL ALBUQUERQUE, NM SP AMER INST PHYS, IEEE, MAGNET SOC, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC AB The micromagnetic emmissions, commonly known as Barkhausen noise, are very sensitive to variations in the microstructure and sub-surface stress states of magnetic materials. Steel pipelines at power plants often have creep damage due to microstructural changes in their service life. Early detection of this damage will prevent costly failures. There is also an increasing demand to characterize the sub-surface stress states in structural materials such as high strength materials used in landing gear components in the aerospace industry. Shot peening ir used to improve the fatigue strength of these components by the introduction of residual compressive stresses to the surface. Because the magnitude of Barkhausen noise varies with the magnitude of compressive stress, these noise measurements can be used for in-situ evaluation of the effectiveness of the shot peening process. Futhermore, surface modification such as ease hardened magnetic samples can be easily observed using micromagnetic Barkhausen noise (MBE) to determine further modification needs. C1 IOWA STATE UNIV SCI & TECHNOL,INST PHYS RES & TECHNOL,AMES,IA 50011. RP SIPAHI, LB (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 8 TC 2 Z9 2 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1994 VL 30 IS 6 BP 4830 EP 4832 DI 10.1109/20.334236 PN 1 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA PU429 UT WOS:A1994PU42900335 ER PT J AU JILES, DC SUOMINEN, L AF JILES, DC SUOMINEN, L TI EFFECTS OF SURFACE STRESS ON BARKHAUSEN EFFECT EMISSIONS - MODEL PREDICTIONS AND COMPARISON WITH X-RAY-DIFFRACTION STUDIES SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 6th Joint Magnetism and Magnetic Materials-Intermag Conference CY JUN 20-23, 1994 CL ALBUQUERQUE, NM SP AMER INST PHYS, IEEE, MAGNET SOC, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID FERROMAGNETIC MATERIALS AB The detection of surface stress in materials is becoming increasingly important in failure analysis. In the case of ferromagnetic steels, the Barkhausen effect provides a practical tool for surface stress evaluation. However, one of the drawbacks of the method has been the lack of an underlying model theory for use in computer simulations of these effects. In recent work a model theory has been suggested and calculations of the effects of stress on the Barkhausen signal amplitude have been made. In this paper results are presented on Barkhausen measurements taken from surface modified materials and x-ray diffraction data from the same specimens. These results show a decrease in Barkhausen signal envelope amplitude with compressive stress in the surface of the material. C1 AMER STRESS TECHNOL,PITTSBURGH,PA 15241. RP JILES, DC (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Jiles, David/H-9548-2012 NR 7 TC 17 Z9 18 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1994 VL 30 IS 6 BP 4924 EP 4926 DI 10.1109/20.334267 PN 1 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA PU429 UT WOS:A1994PU42900366 ER PT J AU TATCHYN, R AF TATCHYN, R TI PLANAR PERMANENT-MAGNET MULTIPOLES FOR PARTICLE ACCELERATOR AND STORAGE-RING APPLICATIONS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article AB In prior work a planar permanent magnet (PM) configuration for generating an approximate quadrupole field distribution in the vicinity of its symmetry axis was disclosed. In the present paper extensions of the method are considered for generating sextupole and higher order multipole fields. The field distributions and strengths are contrasted with idealized (n-fold rotationally symmetric) multipole field generators and selected applications in the area of single-pass and recirculating particle machines are considered. RP TATCHYN, R (reprint author), STANFORD LINEAR ACCELERATOR CTR,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309, USA. NR 15 TC 4 Z9 4 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1994 VL 30 IS 6 BP 5050 EP 5061 DI 10.1109/20.334295 PN 2 PG 12 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA PU430 UT WOS:A1994PU43000010 ER PT J AU RAU, NS AF RAU, NS TI THE USE OF PROBABILITY TECHNIQUES IN VALUE-BASED PLANNING SO IEEE TRANSACTIONS ON POWER SYSTEMS LA English DT Article; Proceedings Paper CT IEEE/PES 1994 Winter Meeting CY JAN 30-FEB 03, 1994 CL NEW YORK, NY SP IEEE, POWER ENGN SOC DE PLANNING; OUTAGE COSTS; VALUE OF SERVICE; RELIABILITY WORTH ID RELIABILITY AB Present techniques used in value-based planning do not properly represent neither the durations of capacity outage nor the effects of outage on post-interruption demand. Generation outage models do not relate the expected quantum of shortages to particular durations of outage. A model is proposed to compute this expectation by using the generator outage statistics in its entirety. The application of this model to the IEEE test system gave different results, depending on which outage cost data were used. Consequently, there is a need for a uniform procedure to report outage costs. A ''bottom-up'' procedure based on end use is proposed as a possibility. RP RAU, NS (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 8 TC 7 Z9 9 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0885-8950 J9 IEEE T POWER SYST JI IEEE Trans. Power Syst. PD NOV PY 1994 VL 9 IS 4 BP 2001 EP 2013 DI 10.1109/59.331462 PG 13 WC Engineering, Electrical & Electronic SC Engineering GA PU998 UT WOS:A1994PU99800042 ER PT J AU RAU, NS WAN, YH AF RAU, NS WAN, YH TI OPTIMUM LOCATION OF RESOURCES IN DISTRIBUTED PLANNING SO IEEE TRANSACTIONS ON POWER SYSTEMS LA English DT Article; Proceedings Paper CT IEEE/PES 1994 Winter Meeting CY JAN 30-FEB 03, 1994 CL NEW YORK, NY SP IEEE, POWER ENGN SOC AB The concept of installing dispersed resources in a utility distribution or subtransmission system is gaining interest in the industry. Such resources could be photovoltaic cells, wind generation, battery storage, fuel cells or demand-side management solicitations. Research by others has suggested that the benefits of distributed resources could be substantial. However, these distributed benefits are site specific. A method to optimally locate such resources in a meshed network for maximizing the potential benefits is outlined in this paper. The proposed second order algorithm computes the amount of resources in selected nodes to make up a given total to achieve the desired optimizing objectives. The network under consideration could be a transmission, sub-transmission, or distribution network. The benefit expressed as a performance index can be the minimization of losses, var losses, or loadings in selected lines. RP RAU, NS (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 6 TC 132 Z9 133 U1 0 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0885-8950 J9 IEEE T POWER SYST JI IEEE Trans. Power Syst. PD NOV PY 1994 VL 9 IS 4 BP 2014 EP 2020 DI 10.1109/59.331463 PG 7 WC Engineering, Electrical & Electronic SC Engineering GA PU998 UT WOS:A1994PU99800043 ER PT J AU TRUDNOWSKI, DJ DONNELLY, MK HAUER, JF AF TRUDNOWSKI, DJ DONNELLY, MK HAUER, JF TI A PROCEDURE FOR OSCILLATORY PARAMETER-IDENTIFICATION SO IEEE TRANSACTIONS ON POWER SYSTEMS LA English DT Article; Proceedings Paper CT IEEE/PES 1994 Winter Meeting CY JAN 30-FEB 03, 1994 CL NEW YORK, NY SP IEEE, POWER ENGN SOC DE ELECTROMECHANICAL OSCILLATIONS; TORSIONAL OSCILLATIONS; PARAMETER IDENTIFICATION; FIELD TESTS; PRONY ANALYSIS ID SYSTEMS AB A procedure is proposed where a power system is excited with a low-level pseudorandom probing signal and the frequency, damping, shape of oscillatory modes are spectral density estimation and frequency-domain transfer-function identification. Attention is focussed on identifying system modes in the presence of noise. Two example cases are studied: identification of electromechanical oscillation modes in 16-machine power system; and turbine-generator shaft modes of a 3-machine power plant feeding a series-compensated 500-kV network. C1 BONNEVILLE POWER ADM, PORTLAND, OR 97208 USA. RP TRUDNOWSKI, DJ (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 20 TC 23 Z9 23 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0885-8950 J9 IEEE T POWER SYST JI IEEE Trans. Power Syst. PD NOV PY 1994 VL 9 IS 4 BP 2049 EP 2055 DI 10.1109/59.331468 PG 7 WC Engineering, Electrical & Electronic SC Engineering GA PU998 UT WOS:A1994PU99800048 ER PT J AU GHISO, NS LENNON, GG AF GHISO, NS LENNON, GG TI LRP130 GENE ASSIGNED TO CHROMOSOME-2 SO IN VITRO CELLULAR & DEVELOPMENTAL BIOLOGY-ANIMAL LA English DT Letter ID SEQUENCES C1 LAWRENCE LIVERMORE NATL LAB, CTR HUMAN GENOME, LIVERMORE, CA 94551 USA. NR 8 TC 5 Z9 5 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1071-2690 EI 1543-706X J9 IN VITRO CELL DEV-AN JI In Vitro Cell. Dev. Biol.-Anim. PD NOV PY 1994 VL 30A IS 11 BP 744 EP 744 PG 1 WC Cell Biology; Developmental Biology SC Cell Biology; Developmental Biology GA PU528 UT WOS:A1994PU52800005 ER PT J AU ANTHONY, RG DOSCH, RG GU, D PHILIP, CV AF ANTHONY, RG DOSCH, RG GU, D PHILIP, CV TI USE OF SILICOTITANATES FOR REMOVING CESIUM AND STRONTIUM FROM DEFENSE WASTE SO INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH LA English DT Article AB A new hydrous crystalline silicotitanate (CST), which we call TAM-5, has be synthesized that selectively removes cesium cations from solutions containing up to 5.7 M Na+ and for a pH range of less than 1 to greater than 14. In basic media and at the high concentrations of Na+ the CST also removes strontium cations from the solution. For a solution containing 5.7 M Na+, 0.6 M OH-, 5.1 M NO3-, 100 mg/L Cs+, and 20 mg/L Sr2+, the distribution coefficients for cesium and strontium are 1000 ml/g and greater than 4,000 ml/g, respectively. For a solution of 5.7 M NaNO3, 100 mg/L Cs+ and 20 mg/L Sr2+ the distribution coefficient for cesium is greater than 10 000 mL/g and for strontium it is equal to 200 mL/g. Experimental studies have also been conducted using complex waste simulants, which compare the performance of this CST and up to 60 other potential ion exchangers/absorbents. These studies substantiate the high selectivity of the CST for cesium in acidic and basic solutions. This new CST, labeled TAM-5, has considerable potential for removing cesium and strontium from defense wastes. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP ANTHONY, RG (reprint author), TEXAS A&M UNIV,DEPT CHEM ENGN,KINET CATALYSIS & CHEM REACT ENGN LAB,COLLEGE STN,TX 77843, USA. NR 12 TC 87 Z9 94 U1 3 U2 25 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0888-5885 J9 IND ENG CHEM RES JI Ind. Eng. Chem. Res. PD NOV PY 1994 VL 33 IS 11 BP 2702 EP 2705 DI 10.1021/ie00035a020 PG 4 WC Engineering, Chemical SC Engineering GA PQ604 UT WOS:A1994PQ60400020 ER PT J AU ODOWD, WJ MARKUSSEN, JM PENNLINE, HW RESNIK, KP AF ODOWD, WJ MARKUSSEN, JM PENNLINE, HW RESNIK, KP TI CHARACTERIZATION OF NO(2) AND SO(2) REMOVALS IN A SPRAY DRYER BAGHOUSE SYSTEM SO INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH LA English DT Article AB Oxidation of NO to NO2 has been proposed as a method for enhancing NOx removals in conventional flue gas desulfurization (FGD) processes. This experimental investigation characterizes the removals of NO2 and SO2 in a 1.1 m3(standard)/min spray dryer/baghouse system. Flue gas was generated by burning a no. 2 fuel oil, which was subsequently spiked upstream of the spray dryer with NO2 or SO2 or both. Lime slurry was injected via a rotary atomizer into the spray dryer. Variables studied include the approach to the adiabatic saturation temperature, stoichiometric ratio, SO2 concentration, and NO2 concentration. Significant quantities of NO2 are scrubbed in this system, and over half of the total removal (at inlet NO2 > 400 ppm) occurs in the baghouse. Increasing NO2 concentrations enhance the amount of NOx removed in the system. Also, the presence of significant quantities of NO2 enhances the baghouse SO2 removal. Although up to 72% NO2 removals were obtained, concentrations of NO2 that exited the system were greater than 50 ppm for all conditions investigated. C1 GILBERT COMMONWEALTH INC,LIBRARY,PA 15129. RP ODOWD, WJ (reprint author), US DOE,POB 10940,PITTSBURGH,PA 15236, USA. NR 11 TC 18 Z9 20 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0888-5885 J9 IND ENG CHEM RES JI Ind. Eng. Chem. Res. PD NOV PY 1994 VL 33 IS 11 BP 2749 EP 2756 DI 10.1021/ie00035a026 PG 8 WC Engineering, Chemical SC Engineering GA PQ604 UT WOS:A1994PQ60400026 ER PT J AU SIRIWARDANE, RV POSTON, JA EVANS, G AF SIRIWARDANE, RV POSTON, JA EVANS, G TI SPECTROSCOPIC CHARACTERIZATION OF MOLYBDENUM-CONTAINING ZINC TITANATE DESULFURIZATION SORBENTS SO INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH LA English DT Article ID H2S AB Molybdenum-containing zinc titanate has been identified as a potential regenerable desulfurization sorbent, removing H2S from coal-derived fuel gas up to temperatures of 1035 K. Sorbents were tested in a laboratory scale fixed bed reactor using simulated coal-derived fuel gas and then removed for analysis. The analyses consisted of X-ray photoelectron spectroscopy, scanning electron microscopy/energy-dispersive x-ray spectroscopy, diffuse reflectance infrared Fourier transform spectroscopy, and X-ray diffraction. In the sulfided sorbent, migration of zinc to the surface and sulfur in the sulfide form were observed. In the regenerated sorbent, residual sulfur in the sulfate form was observed. In the sulfided and regenerated sorbent after multicycle testing, a small decrease in the Zn/Ti ratio was detected, indicating some zinc migration. The chemical structure of the sulfided sorbent was different from that of the original sample, as observed by Fourier transform infrared spectroscopy. RP SIRIWARDANE, RV (reprint author), US DOE,MORGANTOWN ENERGY TECHNOL CTR,3610 COLLINS FERRY RD,POB 880,MORGANTOWN,WV 26505, USA. NR 19 TC 26 Z9 28 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0888-5885 J9 IND ENG CHEM RES JI Ind. Eng. Chem. Res. PD NOV PY 1994 VL 33 IS 11 BP 2810 EP 2818 DI 10.1021/ie00035a034 PG 9 WC Engineering, Chemical SC Engineering GA PQ604 UT WOS:A1994PQ60400034 ER PT J AU YU, T LIN, MC MELIUS, CF AF YU, T LIN, MC MELIUS, CF TI ABSOLUTE RATE-CONSTANT FOR THE REACTION OF PHENYL RADICAL WITH ACETYLENE SO INTERNATIONAL JOURNAL OF CHEMICAL KINETICS LA English DT Article ID CAVITY-RING; KINETICS; ABSORPTION AB The absolute rate constant for the reaction of phenyl radical with acetylene has been measured at 20 torr total pressure in the temperature range of 297 to 523 K using the cavity-ring-down technique. These new kinetic data could be quantitatively correlated with the data obtained earlier with a relative rate method under low-pressure (10(-3)-10(-2) torr) and high-temperature (1000-1330 K) conditions. These kinetic data were analyzed in terms of the RRKM theory employing the thermochemical and molecular structure data computed with the BAC-MP4 technique. The calculated results reveal that the total rate constant for the C6H5 + C2H2 reaction (k(t)) is pressure-independent, whereas those for the formation of C6H5C2H (k(b)) and the C6H5C2H2 adduct (k(c)) are strongly pressure-dependent. A least-squares analysis of the calculated values for 300-2000 K at the atmospheric pressure of N2 or Ar can be given by k(b) = 9.5 x 10(-42)T9.33 exp(-1,713/T) k(c) = 1.8 x 10(-7)T-1.63 exp(-2,711/T) and k(t) = 4.1 x 10(-18)T1.77 exp(-1,152/T), all in units of cm3/s. The latter equation effectively represents the two sets of experimental data. (C) 1994 John Wiley & Sons, Inc. C1 EMORY UNIV,DEPT CHEM,ATLANTA,GA 30322. SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94550. NR 20 TC 56 Z9 57 U1 0 U2 2 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0538-8066 J9 INT J CHEM KINET JI Int. J. Chem. Kinet. PD NOV PY 1994 VL 26 IS 11 BP 1095 EP 1104 DI 10.1002/kin.550261105 PG 10 WC Chemistry, Physical SC Chemistry GA PM261 UT WOS:A1994PM26100004 ER PT J AU IM, KH AHLUWALIA, RK AF IM, KH AHLUWALIA, RK TI RADIATIVE ENHANCEMENT OF TUBE-SIDE HEAT-TRANSFER SO INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER LA English DT Article AB The potential of augmenting film coefficient by uniformly dispersing thin metallic/ceramic filaments oriented longitudinally along a tube is investigated. The purpose of the rigidly held filaments is to create a participating medium from a gas otherwise transparent to thermal radiation. The filaments absorb the thermal radiation emitted by the tube and transfer the heat convectively to the flowing gas. Wave theory shows that optical thickness > 10 can be achieved with 50 mum SiC filaments at 300 cm-2 number density in a 2.54 cm diameter tube. Solution of the radiation transport equation indicates that the radiative film coefficients are a function of filament material, diameter and number density, and gas and surface temperatures. C1 ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439. NR 9 TC 4 Z9 4 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0017-9310 J9 INT J HEAT MASS TRAN JI Int. J. Heat Mass Transf. PD NOV PY 1994 VL 37 IS 17 BP 2635 EP 2646 DI 10.1016/0017-9310(94)90381-6 PG 12 WC Thermodynamics; Engineering, Mechanical; Mechanics SC Thermodynamics; Engineering; Mechanics GA PM814 UT WOS:A1994PM81400004 ER PT J AU LILJEGREN, LM AF LILJEGREN, LM TI THE INFLUENCE OF A MEAN FLUID VELOCITY-GRADIENT ON THE PARTICLE FLUID VELOCITY COVARIANCE SO INTERNATIONAL JOURNAL OF MULTIPHASE FLOW LA English DT Article DE PARTICULATE MOTION; TURBULENCE; PARTICLE VELOCITY VARIANCE; 2-PHASE FLOW ID TURBULENT BOUNDARY-LAYER; 2-PHASE FLOW; PIPE-FLOW; AIR; DISPERSION AB The effect of a mean fluid velocity gradient on the particle-fluid velocity covariance and fluctuating relative velocity for a small solid particle suspended in a turbulent gas is examined using Fourier transform techniques. The presence of such a gradient is shown to elevate the covariance above the level predicted without it. The variance of the fluctuating relative velocity is not directly affected by the presence of a mean velocity gradient. The possible impact on turbulence modulation by particles is discussed. RP LILJEGREN, LM (reprint author), PACIFIC NW LAB, DEPT ANALYT, RICHLAND, WA 99352 USA. NR 26 TC 4 Z9 4 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0301-9322 J9 INT J MULTIPHAS FLOW JI Int. J. Multiph. Flow PD NOV PY 1994 VL 20 IS 5 BP 969 EP 977 DI 10.1016/0301-9322(94)90105-8 PG 9 WC Mechanics SC Mechanics GA PM762 UT WOS:A1994PM76200011 ER PT J AU BUKU, A MIRZA, U POLEWSKI, K AF BUKU, A MIRZA, U POLEWSKI, K TI CIRCULAR-DICHROISM (CD) STUDIES ON BIOLOGICAL-ACTIVITY OF MAST-CELL DEGRANULATING (MCD) PEPTIDE ANALOGS SO INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH LA English DT Article DE MCD PEPTIDE ANALOGS; SOLID-PHASE SYNTHESIS; CIRCULAR DICHROISM; HISTAMINE RELEASE ID BEE VENOM; APAMIN; SPECTROMETER AB Analogs of MCD peptide were synthesized by solid-phase methods. Positive charges were deleted at the N- and/or C-terminus, including the helical portion of the molecule. Four peptides were prepared by removing residues 16-18 (Arg-Lys-Ile), 1-2 (Lys), 1-2 and 16-18 and by acetylation of the amino end (Ile), Analogs were tested on mast cells for histamine-releasing activity. Although the helicity of these derivatives, determined by circular dichroism (CD), was not significantly different from the native MCD peptide, two analogs with C-terminal deletions showed a 5- to 10-fold decrease in activity. These findings suggest that the C-terminus is more important than the N-terminus in determining bioactivity of MCD peptide. (C) Munksgaard 1994. C1 ROCKEFELLER UNIV,NEW YORK,NY 10021. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RP BUKU, A (reprint author), CUNY MT SINAI SCH MED,DEPT PHYSIOL & BIOPHYS,BOX 1218,1 GUSTAVE L LEVY PL,NEW YORK,NY 10029, USA. NR 24 TC 9 Z9 10 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0367-8377 J9 INT J PEPT PROT RES JI Int. J. Pept. Protein Res. PD NOV PY 1994 VL 44 IS 5 BP 410 EP 413 PG 4 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA PW684 UT WOS:A1994PW68400002 PM 7534751 ER PT J AU FUCIARELLI, AF SISK, EC MILLER, JH ZIMBRICK, JD AF FUCIARELLI, AF SISK, EC MILLER, JH ZIMBRICK, JD TI RADIATION-INDUCED ELECTRON MIGRATION IN NUCLEIC-ACIDS SO INTERNATIONAL JOURNAL OF RADIATION BIOLOGY LA English DT Article; Proceedings Paper CT 18th L H Gray Conference on Radiation Damage in DNA - Physics, Chemistry and Molecular Biology CY APR 10-14, 1994 CL UNIV BATH, BATH, ENGLAND SP ASSOC INT CANC RES, ASSOC RADIAT RES, CANC RES CAMPAIGN, COMMISS EUROPEAN COMMUNITIES, RADIAT PROTECT RES ACTION, EDINBURGH EAR CONGRESS EDUC TRUST, INT ASSOC RADIAT RES, INT SCI FDN, L H GRAY MEM TRUST, TAYLOR & FRANCIS LTD, UNITED KINGDOM COORDINATING COMM CANC RES HO UNIV BATH ID IRRADIATED DNA; 5-BROMOURACIL; RADIOLYSIS; GUANINE; THYMINE; ANIONS; DAMAGE; PULSE AB Radiation-induced electron migration along DNA is a mechanism by which randomly produced stochastic energy deposition events can lead to non-random types of damage along DNA manifested distal to the sites of the inital energy deposition. Radiation-induced electron migration in nucleic acids has been examined using oligonucleotides containing 5-bromouracil (5-BrU). Interaction of 5-BrU with solvated electrons results in release of bromide ions and formation of uracil-5-yl radicals. Monitoring either bromide ion release or uracil formation provides an opportunity to study electron migration processes in model nucleic acid systems. Using this approach we have discovered that electron migration along oligonucleotides is significantly influenced by the base sequence and strandedness. Migration along 7 base pairs in oligonucleotides containing guanine bases was observed for oligonucleotides irradiated in solution, which compares with mean migration distances of 6-IObp for Escherichia coli DNA irradiated in solution and 5.5 bp for E. coli DNA irradiated in cells. Evidence also suggests that electron migration can occur prefer entially in the 5' to 3' direction along a double-stranded oligonucleotide containing a region of purine bases adjacent to the 5-BrU moiety. Our continued efforts will provide information regarding the contribution of electron transfer along DNA to formation of locally multiply damaged sites created in DNA by exposure to ionizing radiation. C1 NATL ACAD SCI, WASHINGTON, DC 20418 USA. RP FUCIARELLI, AF (reprint author), PACIFIC NW LAB, DEPT BIOL & CHEM, POB 999, RICHLAND, WA 99352 USA. NR 22 TC 27 Z9 28 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0955-3002 J9 INT J RADIAT BIOL JI Int. J. Radiat. Biol. PD NOV PY 1994 VL 66 IS 5 BP 505 EP 509 DI 10.1080/09553009414551531 PG 5 WC Biology; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA PV954 UT WOS:A1994PV95400015 PM 7983438 ER PT J AU KRONENBERG, A AF KRONENBERG, A TI RADIATION-INDUCED GENOMIC INSTABILITY SO INTERNATIONAL JOURNAL OF RADIATION BIOLOGY LA English DT Article; Proceedings Paper CT 18th L H Gray Conference on Radiation Damage in DNA - Physics, Chemistry and Molecular Biology CY APR 10-14, 1994 CL UNIV BATH, BATH, ENGLAND SP ASSOC INT CANC RES, ASSOC RADIAT RES, CANC RES CAMPAIGN, COMMISS EUROPEAN COMMUNITIES, RADIAT PROTECT RES ACTION, EDINBURGH EAR CONGRESS EDUC TRUST, INT ASSOC RADIAT RES, INT SCI FDN, L H GRAY MEM TRUST, TAYLOR & FRANCIS LTD, UNITED KINGDOM COORDINATING COMM CANC RES HO UNIV BATH ID DELAYED REPRODUCTIVE DEATH; WILD-TYPE P53; IRRADIATED MAMMALIAN-CELLS; SURVIVING X-IRRADIATION; DOUBLE-STRAND BREAKS; HAMSTER OVARY CELLS; LETHAL MUTATIONS; CHROMOSOMAL INSTABILITY; IONIZING-RADIATION; GENE AMPLIFICATION AB Quantitative assessment of the heritable somatic effects of ionizing radiation exposures has relied upon the assumption that radiation-induced lesions were 'fixed' in the DNA prior to the first postirradiation mitosis. Lesion conversion was thought to occur during the initial round of DNA replication or as a consequence of error-prone enzymatic processing of lesions. The standard experimental protocols for the assessment of a variety of radiation-induced endpoints (cell death, specific locus mutations, neoplastic transformation and chromosome aberrations) evaluate these various endpoints at a single snapshot in time. In contrast with the aforementioned approaches, some studies have specifically assessed radiation effects as a function of time following exposure. Evidence has accumulated in support of the hypothesis that radiation exposure induces a persistent destabilization of the genome. This instability has been observed as a delayed expression of lethal mutations, as an enhanced rate of accumulation of non-lethal heritable alterations, and as a progressive intraclonal chromosomal heterogeneity. The genetic controls and biochemical mechanisms underlying radiation-induced genomic instability have not yet been delineated. The aim is to integrate the accumulated evidence that suggests that radiation exposure has a persistent effect on the stability of the mammalian genome. RP KRONENBERG, A (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,1 CYCLOTRON RD,MS 70A-1118,BERKELEY,CA 94720, USA. NR 68 TC 78 Z9 83 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0955-3002 J9 INT J RADIAT BIOL JI Int. J. Radiat. Biol. PD NOV PY 1994 VL 66 IS 5 BP 603 EP 609 DI 10.1080/09553009414551691 PG 7 WC Biology; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA PV954 UT WOS:A1994PV95400031 PM 7983453 ER PT J AU HILL, R HECKER, SS STOUT, MG AF HILL, R HECKER, SS STOUT, MG TI AN INVESTIGATION OF PLASTIC-FLOW AND DIFFERENTIAL WORK-HARDENING IN ORTHOTROPIC BRASS TUBES UNDER FLUID PRESSURE AND AXIAL LOAD SO INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES LA English DT Article ID SHEET-METAL AB Thin-walled closed tubes of 70-30 brass were homogeneously deformed to finite levels of strain by internal fluid pressure combined with external longitudinal load in arbitrary fixed ratios. Plastic orthotropy was present initially and remained coaxial with the principal stresses throughout every experiment. On the other hand, the successive contours of equal work in biaxial stress space changed their shapes progressively. The geometry of the entire family is represented here by a simple formula involving only work-dependent parameters. The modelling is complemented by an empirical stress-strain relation for each experiment; the parameters in this case are dependent only on the imposed load ratio. In the present constitutive analysis a primary role is assigned to the contours of equal work (and not to yield loci). That role is further enhanced by our observation that (with certain exceptions) the successive contours act instantaneously as plastic potentials. This means that the components of an infinitesimal increment of logarithmic strain are proportional to the components of the associated normal to the current contour in stress space. In coming to this conclusion we found it advantageous to call in aid the geometric principle of polar reciprocity; as this rarely features in the mechanics literature an exposition ab initio is included in the paper. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP HILL, R (reprint author), UNIV CAMBRIDGE,DEPT APPL MATH & THEORET PHYS,CAMBRIDGE CB3 9EW,ENGLAND. NR 6 TC 76 Z9 78 U1 1 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0020-7683 J9 INT J SOLIDS STRUCT JI Int. J. Solids Struct. PD NOV PY 1994 VL 31 IS 21 BP 2999 EP 3021 DI 10.1016/0020-7683(94)90065-5 PG 23 WC Mechanics SC Mechanics GA PH816 UT WOS:A1994PH81600009 ER PT J AU SAMUEL, MA LI, G AF SAMUEL, MA LI, G TI R AND R(TAU) RATIOS AT THE 5-LOOP LEVEL OF PERTURBATIVE QCD SO INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS LA English DT Article ID CONSTANT ALPHA-S; CROSS-SECTION AB We study perturbative QCD at the five-loop level. In particular we consider R = sigma(tot)(e+e- --> hadrons)/sigma(e+e- --> mu+mu-) and R(tau) = GAMMA(tau --> nu + hadrons)/GAMMA(tau --> enunuBAR). We use our method to estimate the five-loop coefficients. As a result, we obtain alpha(s)(M(Z)) = 0.1186(11) and alpha(s)(34 GeV) = 0.1396(16), which are accurate at the 1% level. We also find R = 3.8350(18), which is consistent with R(tau) and is accurate to 0.05%. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. RP SAMUEL, MA (reprint author), OKLAHOMA STATE UNIV,DEPT PHYS,STILLWATER,OK 74078, USA. NR 19 TC 5 Z9 5 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0020-7748 J9 INT J THEOR PHYS JI Int. J. Theor. Phys. PD NOV PY 1994 VL 33 IS 11 BP 2207 EP 2214 DI 10.1007/BF00675802 PG 8 WC Physics, Multidisciplinary SC Physics GA QB869 UT WOS:A1994QB86900007 ER PT J AU NARAYANAN, T PITZER, KS AF NARAYANAN, T PITZER, KS TI TURBIDITY OF A NEAR-CRITICAL IONIC FLUID SO INTERNATIONAL JOURNAL OF THERMOPHYSICS LA English DT Article; Proceedings Paper CT 12th Symposium on Thermophysical Properties CY JUN 19-24, 1994 CL UNIV COLORADO, BOULDER, CO SP NIST, Chem Sci & Technol Lab, Thermophys Div, Amer Soc Mech Engineers, Heat Transfer Div, Comm Thermophys Properties HO UNIV COLORADO DE CRITICAL PHENOMENA; IONIC FLUIDS; LIQUID-LIQUID TRANSITION; TURBIDITY ID BINARY-LIQUID MIXTURES; CRITICAL-BEHAVIOR; CRITICAL EXPONENT; CRITICAL-POINT; SUSCEPTIBILITY; SCATTERING; TRANSITION AB We report the critical behavior of osmotic compressibility (chi(T)), that was deduced from turbidity, in an ionic fluid mixture comprised of tetra-n-butyl-ammonium picrate in a low dielectric solvent, 1-dodecanol. The liquid-liquid phase separation in this system is driven, predominantly, by Coulombic interactions. Measurements covered the reduced temperature, t, range 7 x 10(-5) less than or equal to t less than or equal to 7 x 10(-2). The critical behavior of chi(T) indicates a crossover from the mean-field to the Ising critical exponent, as the critical temperature (T-c) is approached. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 21 TC 1 Z9 1 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0195-928X J9 INT J THERMOPHYS JI Int. J. Thermophys. PD NOV PY 1994 VL 15 IS 6 BP 1037 EP 1043 DI 10.1007/BF01458813 PG 7 WC Thermodynamics; Chemistry, Physical; Mechanics; Physics, Applied SC Thermodynamics; Chemistry; Mechanics; Physics GA QM430 UT WOS:A1994QM43000003 ER PT J AU FETSKO, SW CUMMINGS, PT AF FETSKO, SW CUMMINGS, PT TI SIMULATION OF BEAD-AND-SPRING CHAIN MODELS FOR SEMIDILUTE POLYMER-SOLUTIONS IN SHEAR-FLOW SO INTERNATIONAL JOURNAL OF THERMOPHYSICS LA English DT Article; Proceedings Paper CT 12th Symposium on Thermophysical Properties CY JUN 19-24, 1994 CL UNIV COLORADO, BOULDER, CO SP NIST, Chem Sci & Technol Lab, Thermophys Div, Amer Soc Mech Engineers, Heat Transfer Div, Comm Thermophys Properties HO UNIV COLORADO DE BROWNIAN DYNAMICS; RHEOLOGY; SEMIDILUTE POLYMER SOLUTIONS; VISCOSITY ID MOLECULAR-DYNAMICS SIMULATION; BROWNIAN-DYNAMICS; DUMBBELL LIQUIDS; FENE AB We report preliminary results of simulations of the steady-state theological behavior for semidilute polymer solutions of bead-and-spring chain models in planar Couette flow. The simulations include examination of the effects of excluded volume, hydrodynamic interactions, and density. Hydrodynamic interactions are modeled by the Rotne-Prager-Yamakawa tenser. The simulations are based on the nonequilibrium Brownian dynamics algorithm of Ermak and McCammon. In addition to the spring potential between neighboring beads in the chain, the interaction between any two beads in the solution is modeled using a shifted, repulsive Lennard-Jones potential. Lees-Edward sliding brick boundary conditions are used for consistency with the Couette flow field. C1 UNIV TENNESSEE,DEPT CHEM ENGN,KNOXVILLE,TN 37996. UNIV VIRGINIA,DEPT CHEM ENGN,CHARLOTTESVILLE,VA 22903. OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831. RI Cummings, Peter/B-8762-2013 OI Cummings, Peter/0000-0002-9766-2216 NR 22 TC 5 Z9 5 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0195-928X J9 INT J THERMOPHYS JI Int. J. Thermophys. PD NOV PY 1994 VL 15 IS 6 BP 1085 EP 1091 DI 10.1007/BF01458817 PG 7 WC Thermodynamics; Chemistry, Physical; Mechanics; Physics, Applied SC Thermodynamics; Chemistry; Mechanics; Physics GA QM430 UT WOS:A1994QM43000007 ER PT J AU JENCKS, HW AF JENCKS, HW TI THE PRC MILITARY AND SECURITY POLICY IN THE POST-COLD-WAR ERA SO ISSUES & STUDIES LA English DT Article; Proceedings Paper CT 23rd Sino-American Conference on Contemporary China CY JUN 07-08, 1994 CL TAIPEI, TAIWAN SP NATL CHENGCHI UNIV, INST INT RELAT AB Economic development and internal security are the considerations that dominate foreign, security, and military policies of the People's Republic of China (PRC). Beyond these immediate concerns, the Chinese are determined to achieve the international status and influence of a ''great power.'' To achieve that, they are building ''great power'' armed forces. Chinese policies and actions often seem aggressive to their neighbors. Much of this behavior stems from fundamental assumptions about China's special status in Asia. Although Peking (Beijing) denies seeking ''hegemony,'' China's neighbors note the PRC's military doctrine of ''limited and regional wars,'' and the growing power projection capability of the People's Liberation Army (PLA). At the logical extreme of the PRC's ''hegemonist'' aspiration is a willingness to intervene militarily if a neighbor's behavior goes ''out of bounds,'' or if it gets too close to an outside power. The PRC's treatment of Vietnam is a prime example, as is its more recent policy toward Mongolia. The Chinese sincerely want to be friendly and cooperative. However, they assume that they should be the dominant regional power, and that other powers, including the United States, should recognize and defer to their regional interests. The Japanese are their only strong rival for regional hegemony. Accordingly, PLA officers regard Japan as a long-term military threat, while others in the region fear a Sino-Japanese arms race. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP JENCKS, HW (reprint author), UNIV CALIF BERKELEY,CTR CHINESE STUDIES,BERKELEY,CA 94720, USA. NR 7 TC 0 Z9 0 U1 0 U2 3 PU INST INTERNAT RELATIONS PI MUCHA PA 64 WAN SHOU ROAD, MUCHA, TAIPEI, TAIWAN SN 1013-2511 J9 ISSUES STUD JI Issues Stud. PD NOV PY 1994 VL 30 IS 11 BP 65 EP 103 PG 39 WC Area Studies; International Relations; Political Science SC Area Studies; International Relations; Government & Law GA PU997 UT WOS:A1994PU99700004 ER PT J AU LI, F FRANZEN, HF AF LI, F FRANZEN, HF TI FROM PYRRHOTITE TO TROILITE - AN APPLICATION OF THE LANDAU THEORY OF PHASE-TRANSITIONS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Letter C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 9 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD NOV PY 1994 VL 215 IS 1-2 BP L3 EP L6 DI 10.1016/0925-8388(94)90812-5 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA PT405 UT WOS:A1994PT40500002 ER PT J AU CRAIN, JS ALVARADO, J AF CRAIN, JS ALVARADO, J TI HYDRIDE INTERFERENCE ON THE DETERMINATION OF MINOR ACTINIDE ISOTOPES BY INDUCTIVELY-COUPLED PLASMA-MASS SPECTROMETRY SO JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY LA English DT Article DE INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY; SPECTRAL INTERFERENCE; ACTINIDE DETERMINATION ID ICP-MS; DESOLVATION; AEROSOL AB Hydrogen adducts of the major naturally occurring actinide isotopes Th-232 and U-238 were studied using an inductively coupled plasma mass spectrometer. The hydride:atomic ion ratios for both elements varied as a function of the parameters that were studied, i.e., nebulizer flow rate, solution uptake rate and desolvation conditions. When the instrument sensitivity for U and Th was optimized, (ThH+)-Th-232:Th-232(+) was found to be (3.9 +/- 0.2) x 10(-5) with pneumatic nebulization and (2.10 +/- 0.07) x 10(-5) with ultrasonic nebulization. Under the same conditions, (UH+)-U-238:U-238(+) was found to be (3.2 +/- 0.2) x 10(-5) and (1.8 +/- 0.1) x 10(-5) using pneumatic and ultrasonic nebulization, respectively. Conditions that reduced hydrogen number density and/or increased plasma temperature decreased the hydride:atomic ion ratio. Such conditions are best if U-233 and Pu-239 are to be determined in the presence of Th-232 and U-238. C1 ARGONNE NATL LAB, DIV ENVIRONM RES, ARGONNE, IL 60439 USA. RP CRAIN, JS (reprint author), ARGONNE NATL LAB, DIV CHEM TECHNOL, ANALYT CHEM LAB, 9700 S CASS AVE, ARGONNE, IL 60439 USA. NR 16 TC 35 Z9 36 U1 0 U2 2 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND SN 0267-9477 J9 J ANAL ATOM SPECTROM JI J. Anal. At. Spectrom. PD NOV PY 1994 VL 9 IS 11 BP 1223 EP 1227 DI 10.1039/ja9940901223 PG 5 WC Chemistry, Analytical; Spectroscopy SC Chemistry; Spectroscopy GA PR004 UT WOS:A1994PR00400006 ER PT J AU BARSHICK, SA BUCHANAN, MV AF BARSHICK, SA BUCHANAN, MV TI RAPID ANALYSIS OF ANIMAL DRUG RESIDUES BY MICROCOLUMN SOLID-PHASE EXTRACTION AND THERMAL-DESORPTION ION-TRAP MASS-SPECTROMETRY SO JOURNAL OF AOAC INTERNATIONAL LA English DT Article ID PHENOTHIAZINE AB A new approach was developed for the rapid and quantitative determination of an anthelmintic drug, phenothiazine, in milk. The technique involves a simple extraction procedure using a C-18 microcolumn disc, followed by thermal desorption of the analyte from the disc directly into an ion trap mass spectrometer. The compounds are selectively ionized by isobutane chemical ionization and detected by tandem mass spectrometry. With this approach, 10 ppb detection limits were achieved with as little as 100 mu L milk and only 10 min of analysis time. This approach was used to analyze samples of milk taken from a cow administered a one-time therapeutic dose of phenothiazine. The target compound could be detected at 56 h post-dosage, corresponding to a concentration of 30 ppb. RP BARSHICK, SA (reprint author), OAK RIDGE NATL LAB,DIV ANALYT CHEM,POB 2008,OAK RIDGE,TN 37831, USA. RI Buchanan, Michelle/J-1562-2016 OI Buchanan, Michelle/0000-0002-8078-4575 NR 13 TC 3 Z9 3 U1 0 U2 1 PU AOAC INTERNATIONAL PI GAITHERSBURG PA 481 NORTH FREDRICK AVE, STE 500, GAITHERSBURG, MD 20877-2504 SN 1060-3271 J9 J AOAC INT JI J. AOAC Int. PD NOV-DEC PY 1994 VL 77 IS 6 BP 1428 EP 1434 PG 7 WC Chemistry, Analytical; Food Science & Technology SC Chemistry; Food Science & Technology GA PW574 UT WOS:A1994PW57400009 PM 7819752 ER PT J AU WATERS, LC SMITH, RR STEWART, JH JENKINS, RA COUNTS, RW AF WATERS, LC SMITH, RR STEWART, JH JENKINS, RA COUNTS, RW TI EVALUATION OF 2 FIELD SCREENING-TEST KITS FOR THE DETECTION OF PCBS IN SOIL BY IMMUNOASSAY SO JOURNAL OF AOAC INTERNATIONAL LA English DT Article AB Effective field screening methods could minimize the time and reduce the cost of characterizing and remediating hazardous waste sites. Rigorous evaluation of novel field screening methods is required before they can be considered as replacements for, or adjuncts to, currently used laboratory methods. Alternatives to standard laboratory analytical methods should be rapid, analyte-specific, cost-effective, accurate, and sensitive in the range at which the analyte is regulated. In this study, 2 immunoassay-based field test kits for polychlorinated biphenyls (PCBs) in soil were evaluated with reference to those criteria. PCBs were analyzed in both spiked and field soil samples. Based on laboratory performance, we estimate that 20 to 40 samples can be analyzed in the field per day. Sensitivity of the assay is in the 1 ppm range. Because the assay is based on the specificity of the antigen/antibody reaction, interferences are practically negligible. The method is accurate; the false-negative and false-positive results that were observed can be explained by differences in the immunoreactivities of the Aroclors present in the test samples and the Aroclors used as standards in the assay. The savings in time and expense to analyze PCBs in soil with the immunoassay-based test kits over conventional laboratory methods should be substantial. C1 OAK RIDGE NATL LAB,DIV COMP APPLICAT,OAK RIDGE,TN 37831. RP WATERS, LC (reprint author), OAK RIDGE NATL LAB,SECT ORGAN CHEM,DIV CHEM & ANALYT SCI,POB 2008,OAK RIDGE,TN 37831, USA. NR 6 TC 18 Z9 18 U1 0 U2 0 PU AOAC INTERNATIONAL PI GAITHERSBURG PA 481 NORTH FREDRICK AVE, STE 500, GAITHERSBURG, MD 20877-2504 SN 1060-3271 J9 J AOAC INT JI J. AOAC Int. PD NOV-DEC PY 1994 VL 77 IS 6 BP 1664 EP 1671 PG 8 WC Chemistry, Analytical; Food Science & Technology SC Chemistry; Food Science & Technology GA PW574 UT WOS:A1994PW57400043 ER PT J AU ASOKAKUMAR, P LYNN, KG WELCH, DO AF ASOKAKUMAR, P LYNN, KG WELCH, DO TI CHARACTERIZATION OF DEFECTS IN SI AND SIO2-SI USING POSITRONS SO JOURNAL OF APPLIED PHYSICS LA English DT Review ID MOLECULAR-BEAM-EPITAXY; VACANCY-TYPE DEFECTS; OXIDE-SEMICONDUCTOR STRUCTURES; ELECTRON-IRRADIATED SILICON; VARIABLE-ENERGY POSITRONS; SI-SIO2 INTERFACE DEFECTS; SI-29 HYPERFINE-STRUCTURE; SEMI-INSULATING GAAS; IMPLANTED GAAS; LIFETIME SPECTROSCOPY AB In the past few years, there has been rapid growth in the positron annihilation spectroscopy (PAS) of overlayers, interfaces, and buried regions of semiconductors. There are few other techniques that are as sensitive as PAS to low concentrations of open-volume-type defects. The characteristics of the annihilation gamma rays depend strongly on the local environment of the annihilation sites and are used to probe defect concentrations in a range inaccessible to conventional. defect probes, yet which are important in the electrical performance of device structures. We show how PAS can be used as a nondestructive probe to examine defects in technologically important Si-based structures. The discussion will focus on the quality of overlayers, formation and annealing of defects after ion implantation, identification of defect complexes, and evaluation of the distribution of internal electric fields. We describe investigations of the activation energy for the detrapping of hydrogen from SiO2-Si interface trap centers, variations of interface trap density, hole trapping at SiO2-Si interfaces, and radiation damage in SiO2-Si systems. We also briefly summarize the use of PAS in compound semiconductor systems and suggest some future directions. RP BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. RI Schaff, William/B-5839-2009 NR 235 TC 267 Z9 268 U1 0 U2 42 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 NOV 1 PY 1994 VL 76 IS 9 BP 4935 EP 4982 DI 10.1063/1.357207 PG 48 WC Physics, Applied SC Physics GA PQ026 UT WOS:A1994PQ02600001 ER PT J AU SIMONS, JK DUEVEL, RV FRIGO, SP TAYLOR, JW ROSENBERG, RA AF SIMONS, JK DUEVEL, RV FRIGO, SP TAYLOR, JW ROSENBERG, RA TI SYNCHROTRON-RADIATION STUDIES OF DIAMOND NUCLEATION AND GROWTH ON SI SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; THIN-FILMS; RAMAN-SPECTROSCOPY; FINE-STRUCTURE; SURFACE; SILICON; MICROSPECTROSCOPY; PARTICLES AB Valence-band as well as Si(2p) and C(1s) core-level photoemission, Auger, and near-edge x-ray-absorption fine-structure spectroscopies were used to follow the surface chemistry associated with diamond film deposition with a filament-assisted chemical-vapor-deposition reactor on atomically clean and diamond polished Si(100) and Si(111) surfaces. Raman spectroscopy and atomic force microscopy (AFM) were also used ex situ to characterize the deposited films. Within 3 min of deposition, a carbon-rich SiC layer, at least 13 Angstrom thick, was observed to develop. At early stages of growth (<10 min of deposition), no differences were observed between the clean and diamond-polished surfaces. With additional deposition, a 20-30-Angstrom-thick amorphous carbon overlayer was deposited on the clean Si surfaces: The amorphous carbon layer did not promote diamond nucleation. Deposition of an a-C:H layer on top of the amorphous carbon layer also did not promote diamond nucleation. In contrast, similar to 500 Angstrom diamond films were deposited within 45-60 min on the diamond-polished surfaces. Two types of nuclei were observed following 20 min of deposition by atomic force microscopy: (1) large (200-300 nm in diameter) nuclei, randomly distributed on the surface; and (2) smaller (50-100 nm) nuclei that show a preference for forming along the scratches. Atomic force micrographs of the originally clean surface shaw the formation of sharp relief structures on the surface. These structures, combined with the amorphous carbon overlayer, may be responsible for the few sites that do nucleate diamond on unpolished Si surfaces. C1 UNIV WISCONSIN, CTR SYNCHROTRON RADIAT, DEPT CHEM, STOUGHTON, WI 53589 USA. WR GRACE & CO CONN, WASHINGTON RES CTR, COLUMBIA, MD 21044 USA. UNIV WISCONSIN, CTR SYNCHROTRON RADIAT, DEPT PHYS, STOUGHTON, WI 53589 USA. UNIV WISCONSIN, DEPT CHEM, MADISON, WI 53706 USA. ARGONNE NATL LAB, ADV PHOTON SOURCE, ARGONNE, IL 60439 USA. RI Rosenberg, Richard/K-3442-2012 NR 30 TC 8 Z9 8 U1 0 U2 2 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 1 PY 1994 VL 76 IS 9 BP 5481 EP 5491 DI 10.1063/1.357166 PG 11 WC Physics, Applied SC Physics GA PQ026 UT WOS:A1994PQ02600072 ER PT J AU YAGER, D CLOUTIER, T FELDMAN, H BASTACKY, J DRAZEN, JM KAMM, RD AF YAGER, D CLOUTIER, T FELDMAN, H BASTACKY, J DRAZEN, JM KAMM, RD TI AIRWAY SURFACE LIQUID THICKNESS AS A FUNCTION OF LUNG-VOLUME IN SMALL AIRWAYS OF THE GUINEA-PIG SO JOURNAL OF APPLIED PHYSIOLOGY LA English DT Article DE EPITHELIAL PERMEABILITY; FREEZING ARTIFACTS; SURFACE TENSION GRADIENTS; LOW-TEMPERATURE SCANNING ELECTRON MICROSCOPY ID ELECTRON-MICROSCOPY; EPITHELIUM; BRONCHIOLES; TRANSPORT AB The average thickness and distribution of airway surface liquid (ASL) on the luminal surface of peripheral airways were measured in normal guinea pig lungs frozen at functional residual capacity (FRC) and total lung capacity (TLC). Tissue blocks containing cross sections of airways of internal perimeter 0.188-3.342 mm were cut from frozen lungs and imaged by low-temperature scanning electron microscopy (LTSEM). Measurements made from LTSEM images were found to be independent of freezing rate by comparision of measurements at rapid and slow freezing rates. At both lung volumes, the ASL was not uniformly distributed in either the circumferential or longitudinal direction; there were regions of ASL where its thickness was < 0.1 mu m, whereas in other regions ASL collected in pools. Discernible liquid on the surfaces of airways frozen at FRC followed the contours of epithelial cells and collected in pockets formed by neighboring cells, a geometry consistent with a low value of surface tension at the air-liquid interface. At TLC airway liquid collected to cover epithelial cells and to form a liquid meniscus, a geometry consistent with a higher value of surface tension. The average ASL thickness (h) was approximately proportional to the square root of airway internal perimeter, regardless of lung volume. For airways of internal perimeter 250 and 1,800 mu m, h was 0.9 and 1.8 mu m at FRC and 1.7 and 3.7 mu m at TLC, respectively. For a given airway internal perimeter, h was 1.99 times thicker at TLC than at FRC; the difference was statistically significant (P < 0.01; 95% confidence interval 1.29-3.08). These measurements suggest that the ASL layer is highly dynamic and that movement of liquid across the airway wall and along the airway tree are both significant factors in establishing ASL thickness under normal conditions. Transepithelial pressure gradients, ion transport, and intraluminal surface tension gradients are potential mechanisms driving ASL flow, and accumulation or depletion of the ASL via these mechanisms can occur on time scales of < 1 min. C1 HARVARD UNIV,SCH PUBL HLTH,DEPT ENVIRONM SCI & PHYSIOL,RESP BIOL PROGRAM,BOSTON,MA 02115. MIT,DEPT MECH ENGN,CAMBRIDGE,MA 02139. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. RP YAGER, D (reprint author), UNIV CALIF BERKELEY,DEPT MECH ENGN,BIOENGN LAB,BERKELEY,CA 94720, USA. RI Drazen, Jeffrey/E-5841-2012 FU NHLBI NIH HHS [HL-33009, HL-45679-03, HL-52161] NR 25 TC 34 Z9 34 U1 0 U2 1 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 8750-7587 J9 J APPL PHYSIOL JI J. Appl. Physiol. PD NOV PY 1994 VL 77 IS 5 BP 2333 EP 2340 PG 8 WC Physiology; Sport Sciences SC Physiology; Sport Sciences GA PQ375 UT WOS:A1994PQ37500040 PM 7868452 ER PT J AU CLARKE, DB LEE, DK SANDOVAL, MJ BELL, AT AF CLARKE, DB LEE, DK SANDOVAL, MJ BELL, AT TI INFRARED STUDIES OF THE MECHANISM OF METHANOL DECOMPOSITION ON CU/SIO2 SO JOURNAL OF CATALYSIS LA English DT Article ID SUPPORTED COPPER-CATALYSTS; METHYL FORMATE; FORMALDEHYDE ADSORPTION; CU(110) SURFACES; FORMIC-ACID; OXIDATION; CU(100); OXYGEN; CO; IR AB The mechanism of methanol decomposition on silica-supported Cu has been investigated by means of infrared spectroscopy and temperature-programmed desorption spectroscopy. Infrared spectra taken during both isothermal and temperature-programmed experiments reveal the following species: methanol, methoxy groups, formaldehyde, methylenebis(oxy) groups, and formate groups. The only products observed during temperature-programmed decomposition are formaldehyde, carbon dioxide, hydrogen, and water. The ratio of hydrogen to carbon dioxide is 0.5 indicating that both products are formed by the decomposition of formate groups on the surface of copper. A mechanism for methanol decomposition is proposed, based on the sequence of species observed during temperature-programmed infrared (TPD-LR) experiments. Simulations of the TPD-IR experiments based on the proposed scheme provide an accurate representation of the observed variations in the concentrations of adsorbed species. (C) 1994 Academic Press, Inc. C1 UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. RP CLARKE, DB (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720, USA. OI Bell, Alexis/0000-0002-5738-4645 NR 41 TC 82 Z9 85 U1 2 U2 14 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9517 J9 J CATAL JI J. Catal. PD NOV PY 1994 VL 150 IS 1 BP 81 EP 93 DI 10.1006/jcat.1994.1324 PG 13 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA PN461 UT WOS:A1994PN46100008 ER PT J AU RIBEIRO, FH BONIVARDI, AL KIM, C SOMORJAI, GA AF RIBEIRO, FH BONIVARDI, AL KIM, C SOMORJAI, GA TI TRANSFORMATION OF PLATINUM INTO A STABLE, HIGH-TEMPERATURE, DEHYDROGENATION-HYDROGENATION CATALYST BY ENSEMBLE SIZE-REDUCTION WITH RHENIUM AND SULFUR SO JOURNAL OF CATALYSIS LA English DT Article ID SINGLE-CRYSTAL SURFACES; HYDROCARBON-CONVERSION CATALYSTS; STRUCTURE SENSITIVITY; BIMETALLIC CATALYSTS; SELECTIVITY; HYDROGENOLYSIS; HEXANE; RE; ISOMERIZATION; MAINTENANCE AB The effect of the addition of rhenium and sulfur on the catalytic properties of platinum and on its ability to resist deactivation by carbonaceous deposits was studied. The reactions of neopentane (2,2-dimethylpropane), n-hexane, and cyclohexane in excess HL were studied on model bimetallic catalysts prepared by the deposition of platinum on a rhenium foil or vice versa. The rates were measured in a batch reactor with a ratio of H-2 to hydrocarbon of 30 or 60, a H-2 pressure of 450 kPa, and a reaction temperature in the range of 570 to 800 K. Rhenium-sulfur is catalytically inactive and acted only as a diluent to platinum. As the platinum ensembles on the surface became smaller by dilution with rhenium-sulfur, the rates of the structure-sensitive reactions decreased rapidly and eventually only hydrogenation-dehydrogenation reactions were observed. Most importantly, as the size of the platinum ensembles decreased, they became more resistant to poisoning than the larger ones. (C) 1994 Academic Press, Inc. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV SCI MAT,BERKELEY,CA 94720. OI Ribeiro, Fabio/0000-0001-7752-461X NR 53 TC 61 Z9 62 U1 0 U2 12 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9517 J9 J CATAL JI J. Catal. PD NOV PY 1994 VL 150 IS 1 BP 186 EP 198 DI 10.1006/jcat.1994.1335 PG 13 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA PN461 UT WOS:A1994PN46100019 ER PT J AU LOGAN, J VOLKOW, ND FOWLER, JS WANG, GJ DEWEY, SL MACGREGOR, R SCHLYER, D GATLEY, SJ PAPPAS, N KING, P HITZEMANN, R VITKUN, S AF LOGAN, J VOLKOW, ND FOWLER, JS WANG, GJ DEWEY, SL MACGREGOR, R SCHLYER, D GATLEY, SJ PAPPAS, N KING, P HITZEMANN, R VITKUN, S TI EFFECTS OF BLOOD-FLOW ON [C-11] RACLOPRIDE BINDING IN THE BRAIN - MODEL SIMULATIONS AND KINETIC-ANALYSIS OF PET DATA SO JOURNAL OF CEREBRAL BLOOD FLOW AND METABOLISM LA English DT Article DE RACLOPRIDE; POSITRON EMISSION TOMOGRAPHY; BLOOD FLOW; COMPARTMENTAL MODELS; D2 RECEPTORS ID POSITRON EMISSION TOMOGRAPHY; C-11 RACLOPRIDE BINDING; ENDOGENOUS DOPAMINE; RAT-BRAIN; H-3 RACLOPRIDE; RECEPTOR; TRANSPORT; INVIVO; HYPERVENTILATION; FLUMAZENIL AB To assess the stability of different measures of receptor occupancy from [C-11]raclopride (a D2 antagonist) studies with positron emission tomography, we analyze data from five test/retest studies in normal volunteers in terms of individual model parameters from a three-compartment model, the distribution volume (DV) and the ratio of DVs from a receptor-containing region of interest to a non-receptor-containing region. Large variations were found in the individual model parameters, limiting their usefulness as an indicator of change in receptor systems. The DV ratio showed the smallest variation. Individual differences were reflected in the greater intersubject variation in DV than intrasubject variation. The potential effects of blood flow on these measurements were addressed both experimentally and by simulation studies using three models that explicitly incorporate blood flow into a compartmental model that also includes receptor-ligand binding. None of the models showed any variation in the DV with changes in blood flow as long as flow was held constant during the simulation. Experimentally, blood flow was significantly reduced by hyperventilation in a human subject. The DV was found to be reduced relative to baseline in the hyperventilation study, but the DV ratio remained unchanged. The effect of elevated and reduced flow was also tested in two baboon experiments in which Pco(2) was varied. Some variability in the DV ratio was observed but was not correlated with changes in blood flow. This raises the possibility that other factors indirectly related to changes in blood flow (or Pco(2)) may cause changes in DV, and these effects need to be considered when evaluating experimental results. C1 BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. SUNY STONY BROOK,DEPT PSYCHIAT,STONY BROOK,NY 11794. SUNY STONY BROOK,DEPT ANESTHESIOL,STONY BROOK,NY 11794. VET ADM MED CTR,NORTHPORT,NY. RP LOGAN, J (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. FU NIDA NIH HHS [DA-06891]; NIMH NIH HHS [MH-49165]; NINDS NIH HHS [NS-15638] NR 37 TC 138 Z9 138 U1 1 U2 1 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0271-678X J9 J CEREBR BLOOD F MET JI J. Cereb. Blood Flow Metab. PD NOV PY 1994 VL 14 IS 6 BP 995 EP 1010 PG 16 WC Endocrinology & Metabolism; Hematology; Neurosciences SC Endocrinology & Metabolism; Hematology; Neurosciences & Neurology GA PM721 UT WOS:A1994PM72100014 PM 7929663 ER PT J AU ENGELKE, F VINCENT, R KING, TS PRUSKI, M AF ENGELKE, F VINCENT, R KING, TS PRUSKI, M TI ADSORPTION, DESORPTION, AND INTERPARTICLE MOTION OF HYDROGEN ON SILICA-SUPPORTED RUTHENIUM - A STUDY BY IN-SITU NUCLEAR-MAGNETIC-RESONANCE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID SURFACE-DIFFUSION; CHEMISORBED HYDROGEN; ELECTRON REFLECTION; RHODIUM CATALYSTS; ADSORBED HYDROGEN; NMR-SPECTROSCOPY; METAL-SURFACES; RU(001); DEUTERIUM; RH/TIO2 AB H-1 NMR line shapes of hydrogen adsorbed on silica-supported ruthenium at pressures of 10(-6)-10 Torr were studied by using selective excitation via DANTE sequences. A transition from inhomogeneous to homogeneous line broadening was observed at hydrogen coverage of similar to 0.5. The spectra were simulated by using generalized Bloch equations that included N-site exchange processes. The homogeneous line shape originates from increased hydrogen mobility, whereas proton-proton dipolar couplings are negligibly small. A rate parameter k obtained from this model quantifies the average mobility of hydrogen in the exchange process. This parameter increases by more than three orders of magnitude when the hydrogen coverage changes from 0.4 to 0.8. The simulations of line shapes obtained at variable temperatures showed that k exhibits Arrhenius behavior with an activation energy of 52 (+/-5) kJ/mol and preexponential factor k(0)=4X10(10) is implied that the motion of hydrogen must involve desorption, interparticle diffusion, and readsorption. C1 UNIV PARIS 06,CHIM SURFACES LAB,F-75230 PARIS,FRANCE. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM ENGN,AMES,IA 50011. RP ENGELKE, F (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 57 TC 14 Z9 14 U1 1 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 1 PY 1994 VL 101 IS 9 BP 7262 EP 7272 DI 10.1063/1.468497 PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PP519 UT WOS:A1994PP51900008 ER PT J AU KNOCHENMUSS, RD SMITH, DE AF KNOCHENMUSS, RD SMITH, DE TI TIME AND INTERNAL ENERGY-DEPENDENT FLUORESCENCE-SPECTRA OF NAPHTHOL-CENTER-DOT-WATER CLUSTERS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID STATE PROTON-TRANSFER; HYDROGEN-BONDED PHENOLS; GAS-PHASE CLUSTERS; PUMP PROBE PHOTOIONIZATION; SUPERSONIC FREE JET; EXCITED-STATE; SOLVATION DYNAMICS; WATER CLUSTERS; MULTIPHOTON IONIZATION; MOLECULAR-DYNAMICS AB Time-resolved fluorescence spectra of 1-naphthol (H2O)(n) clusters formed in a supersonic jet were measured under conditions of strong and weak cooling. Wavelength selectivity was used to excite very similar size distributions in both cases, thereby allowing controlled study of temperaturelike effects of internal energy in clusters. In both warm and cold clusters, long wavelength fluorescence from 1-naphtholate formed via an intermolecular excited state proton transfer (ESPT) reaction is observed, but this emission was significantly more red-shifted in warmer clusters. The fluorescence spectra of warmer clusters also shift strongly to the red after excitation, on a time scale of about 10 ns. Colder clusters showed no spectral shifts on this time scale. A weak solvent isotope effect was also observed. Similar clusters of 2-naphthol with water were not observed to undergo ESPT under any conditions. The time-dependent spectra indicate that ESPT in warm 1-naphthol water clusters is not prompt, but continues on a similar to 10 ns time scale, as does dynamic stabilization of previously reacted clusters. The ESPT rate is believed to be controlled by the rate at which the water relaxes around the naphthol, via interaction with two electronic excited states. The 10 ns and the two faster [R. Knochenmuss, G. R. Holtom, and D. Ray, Chem. Phys. Lett. 215, 188 (1993)] time scales now known in the spectral dynamics are discussed in terms of water solvation relaxation, and connected to the bulk by means of molecular dynamics simulations. C1 PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 61 TC 23 Z9 23 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 1 PY 1994 VL 101 IS 9 BP 7327 EP 7336 DI 10.1063/1.468290 PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PP519 UT WOS:A1994PP51900015 ER PT J AU RUSSO, TV MARTIN, RL HAY, PJ AF RUSSO, TV MARTIN, RL HAY, PJ TI DENSITY-FUNCTIONAL CALCULATIONS ON FIRST-ROW TRANSITION-METALS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID HIGHLY CORRELATED SYSTEMS; KOHN-SHAM THEORY; LARGE BASIS-SETS; CORRELATION-ENERGY; COUPLED-CLUSTER; ELECTRON CORRELATION; EXCITATION-ENERGIES; ACCURATE QUADRATURE; EXCHANGE-ENERGY; NICKEL STATES AB The excitation energies and ionization potentials of the atoms in the first transition series are notoriously difficult to compute accurately. Errors in calculated excitation energies can range from 1 to 4 eV at the Hartree-Fock level, and errors as high as 1.5 eV are encountered for ionization energies. In the current work we present and discuss the results of a systematic study of the first transition series using a spin-restricted Kohn-Sham density-functional method with the gradient-corrected functionals of Becke and Lee, Yang and Pan: Ionization energies are observed to be in good agreement with experiment, with a mean absolute error of approximately 0.15 eV; these results are comparable to the most accurate calculations to date, the quadratic configuration interaction single, double (triple) [QCISD(T)] calculations of Raghavachari and Trucks. Excitation energies are calculated with a mean error of approximately 0.5 eV, compared with similar to 1 eV for the local density approximation and 0.1 eV for QCISD(T). These gradient-corrected functionals appear to offer an attractive compromise between accuracy and computational effort. RP RUSSO, TV (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,MS B268,LOS ALAMOS,NM 87545, USA. NR 61 TC 174 Z9 174 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 1 PY 1994 VL 101 IS 9 BP 7729 EP 7737 DI 10.1063/1.468265 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PP519 UT WOS:A1994PP51900057 ER PT J AU RUSCIC, B BERKOWITZ, J AF RUSCIC, B BERKOWITZ, J TI EXPERIMENTAL-DETERMINATION OF DELTA-H-F(0)(HOBR) AND IONIZATION-POTENTIALS (HOBR) - IMPLICATIONS FOR CORRESPONDING PROPERTIES OF HOI SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID PHOTOIONIZATION; KINETICS; ENERGIES; BROMINE; BRO AB The photoion yield curves of HOBr+ and Br+ from HOBr are presented. The adiabatic I.P. of HOBr is found to be 10.638+/-0.003 eV. Autoionizing structure in HOBr+ is tentatively assigned and leads to an adiabatic I.P. of the first excited (A L(2) A') State of similar to 11.46 eV. The 0 K threshold of Br+ from HOBr (13.915+/-0.018 eV) implies D-0(HO-Br)less than or equal to 2.101+/-0.018 eV=48.45+/-0.42 kcal/mol. Together with auxiliary thermochemicsty, this value yields Delta H-f298(0) (HOBr) greater than or equal to -13.43+/-0.42 kcal/mol, in excellent agreement with a recent ab initio value -14.2+/-1.6 kcal/mol. The resulting proton affinity of BrO is 163.8 kcal/mol. Trends observed in the properties of OX and HOX (X=F, Cl, Pr) are utilized to infer new values for Delta H-f(0)(OI) and Delta H-f(0) (HOI). Predictions are made for I.P.(HOI). Proton affinities of OX are seen to increase with heavier X, while the X (2)A''-A (2)A' Splitting decreases. RP RUSCIC, B (reprint author), ARGONNE NATL LAB,DIV CHEM,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Ruscic, Branko/A-8716-2008 OI Ruscic, Branko/0000-0002-4372-6990 NR 44 TC 80 Z9 81 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 NOV 1 PY 1994 VL 101 IS 9 BP 7795 EP 7803 DI 10.1063/1.468273 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PP519 UT WOS:A1994PP51900063 ER PT J AU LONDONO, JD ANNIS, BK TURNER, JZ SOPER, AK AF LONDONO, JD ANNIS, BK TURNER, JZ SOPER, AK TI THE INTERMOLECULAR HYDROGEN-HYDROGEN STRUCTURE OF CHAIN-MOLECULE LIQUIDS FROM NEUTRON-DIFFRACTION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID TETRAMETHYLAMMONIUM CHLORIDE; AQUEOUS-SOLUTIONS; SCATTERING; BLENDS; POLYMETHYLENE; MODEL; WATER AB Neutron diffraction isotopic substitution experiments on liquid n-decane (C10H22) and n-eicosane (C20H42) are described. The intermolecular H-H structure function h(HH)(Q) and the intermolecular H-H correlation function g(HH)(inter)(r) are obtained without recourse to models of the intramolecular structure. The structure of the g(HH)(inter)(r) found at 2.5, 5.0, and 7.0 Angstrom corresponds to different shells in the H-H pair correlation function. In addition, g(HH)(inter)(r)<1 for a considerable range, due to the screening of intermolecular correlations by intramolecular correlations. This ''correlation hole'' effect is accentuated by extrapolation of the structure functions to the expected infinite wavelength limit, and shows good agreement with values determined from small-angle neutron scattering (SANS) data. All of these features are in good agreement with the results of molecular dynamics simulations for the closely related system C13H28. C1 RUTHERFORD APPLETON LAB,ISIS SCI DIV,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV LONDON BIRKBECK COLL,DEPT CRYSTALLOG,LONDON WC1E 7HX,ENGLAND. RP LONDONO, JD (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 31 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 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 1 PY 1994 VL 101 IS 9 BP 7868 EP 7872 DI 10.1063/1.468212 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PP519 UT WOS:A1994PP51900072 ER PT J AU SMITH, DE DANG, LX AF SMITH, DE DANG, LX TI COMPUTER-SIMULATIONS OF CESIUM WATER CLUSTERS - DO ION WATER CLUSTERS FORM GAS-PHASE CLATHRATES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MOLECULAR-DYNAMICS; MAGIC NUMBERS; ENHANCED STABILITY; THERMAL CONDITIONS; POTENTIALS; REACTIVITY; EXPANSION; HYDRATION; (H2O)21H+; CHLORIDE AB The structure and energetics of cesium ion-water clusters have been investigated using classical molecular dynamics computer simulations and a polarizable interaction model. Recent experiments by Selinger and Castleman [J. Phys. Chem. 95, 8442 (1991)] indicate that the mass-spectral distributions for these clusters exhibit ''magic number'' oscillations at temperatures below approximately 160 K. The observed behavior of this and related charged clusters is commonly attributed to the formation of clathratelike cage structures around a central ionic species. The relationship between the structural and energetic properties of cesium ion-water clusters is reported here as a function of temperature for clusters with between 18 and 22 water molecules. The clusters exhibit solidlike dynamical behavior at kinetic temperatures below about 170 K, and liquidlike behavior at higher temperatures. A thorough analysis of energy minimized (0 K) structures indicates that the most stable clusters consist of water cages surrounding the cesium ion. These cages are related to the proposed clathratelike structures but contain additional 4- and 6-membered water rings and fewer 5-membered rings. The calculated global energy minima exhibit an energetic alternation with cluster size that is consistent with the experimentally observed mass-spectral distributions. In contrast, in the liquidlike regime there are only minor variations in calculated structural and dynamical properties as a function of cluster size. In addition, there is no statistically significant size dependence for the cluster binding energies in the liquidlike regime that might be correlated with experimental data. These results suggest that magic number stability in ion-water clusters may occur only at ''low'' energies in the solidlike cluster regime. C1 NEW MEXICO STATE UNIV, DEPT CHEM & BIOCHEM, LAS CRUCES, NM 88003 USA. RP SMITH, DE (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 39 TC 53 Z9 53 U1 3 U2 16 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 NOV 1 PY 1994 VL 101 IS 9 BP 7873 EP 7881 DI 10.1063/1.468213 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PP519 UT WOS:A1994PP51900073 ER PT J AU RUSCIC, B BERKOWITZ, J AF RUSCIC, B BERKOWITZ, J TI THE H-NCS BOND-ENERGY, DELTA-H-DEGREES(F)(HNCS), DELTA-H-DEGREES(F)(NCS), AND IP(NCS) FROM PHOTOIONIZATION MASS-SPECTROMETRIC STUDIES OF HNCS, NCS, AND (NCS)(2) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID VACUUM ULTRAVIOLET; PHOTO-IONIZATION; SPECTROSCOPY; HEAT; PHOTODISSOCIATION; STATE; PHOTOEXCITATION; SPECTRA; ACID; CN AB The species HNCS and NCS have been studied by photoionization mass spectroscopy. The adiabatic ionization potential (IP) of HNCS is less than or equal to 9.92 eV; the shape of the ion yield curve near threshold implies a large change in geometry, perhaps to linear HNCS+. Various appearance potentials (AP) from HNCS are determined by a more objective procedure, from which Delta H-f(o)(HNCS)>29.6 kcal/mol (and very likely greater than or equal to 31.0+/-0.7 kcal/mol) is deduced. The adiabatic IP of NCS is 10.689+/-0.005 eV. This quantity, together with AP(NCS+/HNCS), yields D-0(H-NCS)less than or equal to 97.2+/-0.2 kcal/mol. However, a measurement of the appearance potential of NCS+ from (NCS)(2) results in a still lower value, D-0(H-NCS)less than or equal to 93.3+/-1.1 kcal/mol, and Delta H-o(f0)(NCS) less than or equal to 72.7 +/- 0.8 kcal/mol. Approximate values are obtained for Delta H-f0(o)(HNCS+) and for the proton affinity of NCS. RP RUSCIC, B (reprint author), ARGONNE NATL LAB,DIV CHEM,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Ruscic, Branko/A-8716-2008 OI Ruscic, Branko/0000-0002-4372-6990 NR 52 TC 37 Z9 37 U1 1 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 1 PY 1994 VL 101 IS 9 BP 7975 EP 7989 DI 10.1063/1.468495 PG 15 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PP519 UT WOS:A1994PP51900085 ER PT J AU MASCHHOFF, BL COWIN, JP AF MASCHHOFF, BL COWIN, JP TI CORRECTED ELECTROSTATIC MODEL FOR DIPOLES ADSORBED ON A METAL-SURFACE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID COLLECTIVE VIBRATIONAL-MODES; THERMAL-DESORPTION; LATERAL INTERACTIONS; CO; ADSORPTION; MOLECULES; PD(100); OXYGEN; NH3 AB We present a dipole-dipole interaction model for polar molecules vertically adsorbed on a idealized metal surface in an approximate analytic form suitable for estimating the coverage dependence of the work function, binding energies, and thermal desorption activation energies. In contrast to previous treatments, we have included all contributions to the interaction energy within the dipole model, such as the internal polarization energy and the coverage dependence of the self-image interaction with the metal. We show that these can contribute significantly to the total interaction energy. We present formulae for both point and extended dipole cases. RP MASCHHOFF, BL (reprint author), PACIFIC NW LAB, ENVIRONM & MOLEC SCI LAB, POB 999,MS K2-14, RICHLAND, WA 99352 USA. NR 31 TC 63 Z9 63 U1 1 U2 13 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 NOV 1 PY 1994 VL 101 IS 9 BP 8138 EP 8151 DI 10.1063/1.468241 PG 14 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PP519 UT WOS:A1994PP51900102 ER PT J AU JAGUST, WJ AF JAGUST, WJ TI FUNCTIONAL IMAGING IN DEMENTIA - AN OVERVIEW SO JOURNAL OF CLINICAL PSYCHIATRY LA English DT Article; Proceedings Paper CT Symposium on Neuroimaging Assessment of Cognitive Disorders/Annual Meeting of the American-Psychiatric-Association CY MAY 25, 1994 CL PHILADELPHIA, PA SP AMER PSYCHIAT ASSOC ID POSITRON EMISSION TOMOGRAPHY; CEREBRAL BLOOD-FLOW; PROGRESSIVE SUPRANUCLEAR PALSY; EARLY ALZHEIMERS-DISEASE; MEDIAL TEMPORAL-LOBE; COMPUTED-TOMOGRAPHY; MAGNETIC-RESONANCE; VASCULAR DEMENTIA; GLUCOSE-UTILIZATION; PARKINSONS-DISEASE AB Functional brain imaging using both positron emission tomography and single photon emission computed tomography has been widely applied to the study of dementing diseases. This article reviews the basic approach of the clinician to the problem of dementia, which primarily entails the exclusion of treatable or reversible causes. Structural brain imaging using magnetic resonance imaging or computed tomography to search for reversible structural brain lesions is a key component of this evaluation. Functional imaging may provide clinicians with additional information helpful in establishing the cause of dementia after a reversible illness has been ruled out. Limitations in the data supporting the use of functional images still exist, however, and these images must be interpreted in the context of the overall clinical presentation. C1 UNIV CALIF DAVIS,DEPT NEUROL,UC DAVIS ALZHEIMERS CTR,DAVIS,CA 95616. RP JAGUST, WJ (reprint author), LAWRENCE BERKELEY LAB,CTR FUNCT IMAGING 55-121,BERKELEY,CA 94720, USA. FU NIA NIH HHS [AG07793, P30 AG10129] NR 74 TC 21 Z9 21 U1 1 U2 1 PU PHYSICIANS POSTGRADUATE PRESS PI MEMPHIS PA P O BOX 240008, MEMPHIS, TN 38124 SN 0160-6689 J9 J CLIN PSYCHIAT JI J. Clin. Psychiatry PD NOV PY 1994 VL 55 SU S BP 5 EP 11 PG 7 WC Psychology, Clinical; Psychiatry SC Psychology; Psychiatry GA PY202 UT WOS:A1994PY20200002 PM 7989292 ER PT J AU SUGAMA, T CARCIELLO, N AF SUGAMA, T CARCIELLO, N TI INTERFACES OF POLYPHENYLETHERETHERKETONE (PEEK) AND POLYPHENYLENE SULFIDE (PPS) COATED ZINC PHOSPHATED STEELS AFTER HEATING-COOLING CYCLES IN A WET, HARSH ENVIRONMENT SO JOURNAL OF COATINGS TECHNOLOGY LA English DT Article ID RAY PHOTOELECTRON-SPECTROSCOPY; TO-METAL JOINTS; CORROSION; ADHESION AB To evaluate the ability of polyphenyletheretherketone (PEEK) and polyphenylene sulfide (PPS) thermoplastic coatings that protect zinc phosphate (Zn.Ph)-treated steels from corrosion in a wet, harsh environment (1.0 wt% H2SO4, 3.0 wt% NaCl, and 96.0% wt% water at temperatures from 25 degrees to 200 degrees C), we exposed them in autoclave to attempt heating-cooling cyclic fatigue tests (1 cycle - 12 hr at 200 degrees C + 12 hr at 25 degrees C) up to 90 times. Although no changes in appearance were seen in the PEEK specimens after 60 cycles, extending the cycles to 90 caused the delamination of the coating film from the Zn.Ph. The major reason for this delamination was the degradation of the PEEK polymer caused by its hydrothermal-catalyzed esterification. In the PPS-coating systems, chemical reactions at the interfaces between the PPS and Zn and Fe in the Zn.Ph layer during cycling led to the formation of ZnS and FeS reaction products, which enhanced the Zn.Ph-to-PPS adhesive bond; correspondingly, there were no signs of peeling and separation of the coating after 90 cycles. In addition, because these intermediate reaction products are insoluble at high pH, they minimized the rate of delamination of the PPS coating caused by the cathodic reaction, H2O + 1/20(2) + 2e(-)' 2OH(-), at the corrosion side of a defect in the film. In contrast, PEEK coatings containing non-reactive Zn.Ph underwent cathodic delamination, because of the susceptibility of Zn.Ph to alkali dissolution. Thus, we believe that combined deters of PPS and Zn. Ph provide great protection to steels in a harsh environment with temperatures up to 200 degrees C. RP SUGAMA, T (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV EFFICIENCY & CONSERVAT,UPTON,NY 11973, USA. NR 18 TC 5 Z9 6 U1 0 U2 1 PU FEDERATION SOC COATING TECH PI BLUE BELL PA 492 NORRISTOWN ROAD, BLUE BELL, PA 19422 SN 0361-8773 J9 J COATING TECHNOL JI J. Coat. Technol. PD NOV PY 1994 VL 66 IS 838 BP 43 EP 54 PG 12 WC Chemistry, Applied; Materials Science, Coatings & Films SC Chemistry; Materials Science GA PT751 UT WOS:A1994PT75100005 ER PT J AU ZHANG, XG HARRIS, MT BASARAN, OA AF ZHANG, XG HARRIS, MT BASARAN, OA TI MEASUREMENT OF DYNAMIC SURFACE-TENSION BY A GROWING DROP TECHNIQUE SO JOURNAL OF COLLOID AND INTERFACE SCIENCE LA English DT Article ID BUBBLE-PRESSURE METHOD; INTERFACIAL-TENSION AB The recently developed growing drop technique for measuring dynamic surface tension in which a drop is grown at the end of a fine capillary into another immiscible fluid has been improved by the use of an ultra-high-speed video camera and motion analysis system. When the relative importance of the surface tension force is large compared to gravitational and viscous forces, i.e., the gravitational Bond number, G, and the capillary number, Ca, are much smaller than unity, shapes of growing drops approach sections of spheres, and the difference in pressure between the interior and the exterior of the drop, Delta p, is related to the surface tension, sigma, and the radius of curvature, R, by the static Young-Laplace formula Delta p = 2 sigma/R. Because the new apparatus described in this paper is capable of measuring transient drop shapes and pressures in 1/6 to 1 ms, it permits detailed observation of profiles of growing drops and pressures inside them virtually from zero surface age and thereby allows exploration of the limitations of the growing drop method. In contrast to related work, the results demonstrate that the present technique can determine the surface tension of an interface with a surface age as low as 20 ms. Although the present technique is capable of measuring tension prior to the hemispherical stage, measurements in the very early stages of drop growth are rendered impossible due to oscillations of the newly forming drop. The high speed of data acquisition that is possible with the new system has resulted in the discovery of a disparity between the extremum in drop pressure and that in drop radius in surfactant-laden drops, which can be attributed to the changing of tension with time. The effect of drop viscosity on the measurement of dynamic surface tension with the growing drop technique is also studied for the first time by forming drops of mixtures of water and glycerol into air. (C) 1994 Academic Press, Inc. C1 OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT CHEM ENGN,KNOXVILLE,TN 37996. NR 37 TC 34 Z9 36 U1 1 U2 6 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9797 J9 J COLLOID INTERF SCI JI J. Colloid Interface Sci. PD NOV PY 1994 VL 168 IS 1 BP 47 EP 60 DI 10.1006/jcis.1994.1392 PG 14 WC Chemistry, Physical SC Chemistry GA PN462 UT WOS:A1994PN46200007 ER PT J AU ANCONA, MG AF ANCONA, MG TI FULLY-LAGRANGIAN AND LATTICE-BOLTZMANN METHODS FOR SOLVING SYSTEMS OF CONSERVATION EQUATIONS SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID NAVIER-STOKES EQUATIONS; GAS AUTOMATA; MAGNETOHYDRODYNAMICS; SIMULATION; DYNAMICS; MODEL AB A class of ''fully-Lagrangian'' methods for solving systems of conservation equations is defined. The key step in formulating these methods is the definition of a new set of field variables for which Lagrangian discretization is trivial. Recently popular lattice-Boltzmann simulation schemes for solving such systems are shown to be a useful sub-class of these fully-Lagrangian methods in which (a) the conservation laws are satisfied at each grid point, (b) the Lagrangian variables are expanded pertubatively, and (c) discretization error is used to represent physics. Such schemes are typically derived using methods of kinetic theory. Our numerical analysis approach shows that the conventional physical derivation, while certainly valid and fruitful, is not essential, that it often confuses physics and numerics and that it can be unnecessarily constraining. For example, we show that lattice-Boltzmann-like methods can be non-perturbative and can be made higher-order, implicit and/or with non-uniform grids. Furthermore, our approach provides new perspective on the relationship between lattice-Boltzmann methods and finite-difference techniques. Among other things, we show that the lattice-Boltzmann schemes are only conditionally consistent and in some cases are identical to the well-known Dufort-Frankel method. Through this connection, the lattice-Boltzmann method provides a rational basis for understanding Dufort-Frankel and gives a pathway for its generalization. At the same time, that Dufort-Frankel is no longer much used suggests that the lattice-Boltzmann approach might also share this fate. (C) 1994 Academic Press, Inc. C1 USN,RES LAB,WASHINGTON,DC 20375. RP ANCONA, MG (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. NR 28 TC 29 Z9 30 U1 1 U2 5 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD NOV PY 1994 VL 115 IS 1 BP 107 EP 120 DI 10.1006/jcph.1994.1181 PG 14 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA PN672 UT WOS:A1994PN67200009 ER PT J AU SALTZMAN, J AF SALTZMAN, J TI AN UNSPLIT 3D UPWIND METHOD FOR HYPERBOLIC CONSERVATION-LAWS SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID DIFFERENCE-SCHEMES; SYSTEMS AB An unsplit upwind method for solving hyperbolic conservation laws in three dimensions is developed. This paper derives the algorithm by generalizing a two-dimensional advection algorithm of Van Leer and Colella to three dimensions and then making appropriate modifications. The method is implemented using the equations of gas dynamics. Several test problems are computed to both verify and display the behavior of the method. These test problems include a 1D blast wave, a 2D shock reflection off a 30-degrees ramp, and a 3D astrophysical jet. (C) 1994 Academic Press, Inc. RP LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 24 TC 90 Z9 90 U1 0 U2 0 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0021-9991 EI 1090-2716 J9 J COMPUT PHYS JI J. Comput. Phys. PD NOV PY 1994 VL 115 IS 1 BP 153 EP 168 DI 10.1006/jcph.1994.1184 PG 16 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA PN672 UT WOS:A1994PN67200012 ER PT J AU LAPENTA, G BRACKBILL, JU AF LAPENTA, G BRACKBILL, JU TI DYNAMIC AND SELECTIVE CONTROL OF THE NUMBER OF PARTICLES IN KINETIC PLASMA SIMULATIONS SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID IMPLICIT; SHOCK; MODEL AB An algorithm for the dynamic control of the number of particles in a particle-in-cell (PIC), plasma simulation is presented. The algorithm selectively splits and coalesces particles to control the number of particles in each grid cell. It is designed for multiple-length scale problems where an adaptive grid can be applied and for PIC simulations on parallel computers where a constant number of particles per cell is useful for computational efficiency. The algorithm preserves the charge assignment at grid points while splitting one particle into two, or while coalescing two particles into one. Errors in momentum or energy conservation are controlled by a simple, a priori test. The accuracy of the algorithm is demonstrated in several simulations in one dimension, including a collisionless slow-shock, where an adaptive grid calculation with dynamic number control gives comparable accuracy to a uniformly zoned calculation without dynamic control with just 50% of the effort. (C) 1994 Academic Press, Inc. C1 POLITECN TORINO, DIPARTIMENTO ENERGET, I-10129 TURIN, ITALY. RP LAPENTA, G (reprint author), LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. OI Lapenta, Giovanni/0000-0002-3123-4024 NR 24 TC 43 Z9 45 U1 1 U2 5 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD NOV PY 1994 VL 115 IS 1 BP 213 EP 227 DI 10.1006/jcph.1994.1188 PG 15 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA PN672 UT WOS:A1994PN67200016 ER PT J AU IYER, AN BALACHANDRAN, U MOTOWIDLO, LR HOEHN, JG HALDAR, P AF IYER, AN BALACHANDRAN, U MOTOWIDLO, LR HOEHN, JG HALDAR, P TI FABRICATION AND CHARACTERISTICS OF TAPES AND TEST MAGNETS MADE FROM AG-CLAD BI-2223 SUPERCONDUCTORS SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT 123rd TMS Annual Meeting: High Temperature Superconductivity CY FEB 27-MAR 03, 1994 CL SAN FRANCISCO, CA DE BI-2223; CRITICAL CURRENT DENSITY; PANCAKE COILS; THERMOMECHANICAL PROCESSING ID CRITICAL-CURRENT-DENSITY; WIRES AB Pb0.4Bi1.8Sr2Ca2.2Cu3Ox (Bi-2223) precursor powder was prepared by a solid-state reaction of carbonates and oxides of lead, bismuth, strontium, calcium, and copper, and the powder was then used to fabricate silver-clad tapes by the powder-in-tube technique. Transport critical current density (J(c)) values >4 x 10(4) A/cm(2) at 77K and 2 x 10(5) A/cm(2) at 4.2 and 27K have been achieved in short tape samples. Long lengths of tape were tested by winding them into pancake coils. Recently, we fabricated a test magnet by stacking ten pancake coils, each containing three 16 m lengths of rolled tape, and tested it at 4.2, 27, and 77K. A maximum generated field of 2.6 T was measured in zero applied field at 4.2K and the test magnet generated significant self-field in background fields up to 20 T. The results are discussed in this paper. C1 IGC ADV SUPERCONDUCTORS INC,WATERBURY,CT 06704. INTERMAGNET GEN CORP,GUILDERLAND,NY 12084. RP IYER, AN (reprint author), ARGONNE NATL LAB,DIV ENERGY TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 20 TC 0 Z9 0 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD NOV PY 1994 VL 23 IS 11 BP 1087 EP 1091 DI 10.1007/BF02649952 PG 5 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA PQ007 UT WOS:A1994PQ00700002 ER PT J AU KRAMER, MJ MCCALLUM, RW NELLIS, WJ BALACHANDRAN, U AF KRAMER, MJ MCCALLUM, RW NELLIS, WJ BALACHANDRAN, U TI EFFECTS OF SHOCK-INDUCED DEFECT DENSITY ON FLUX-PINNING IN MELT-TEXTURED YBA2CU3O7-DELTA SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT 123rd TMS Annual Meeting: High Temperature Superconductivity CY FEB 27-MAR 03, 1994 CL SAN FRANCISCO, CA DE CRITICAL CURRENT DENSITY; DISLOCATIONS; FLUX-PINNING; MELT-TEXTURED Y123; SHOCK-COMPACTION; STACKING FAULTS; TRANSMISSION ELECTRON MICROSCOPY (TEM) AB To introduce a high density of homogeneously distributed defects in YB2Cu3O7-delta (Y123), melt textured samples were shock-compacted at pressures up to 12.6 GPa (126 Kbar) at orientations favorable to slip along the basal planes.(1) Shock compressing melt-textured Y123 results in a nearly uniform defect density which is two to three orders of magnitude higher than in unshocked melt-textured material. However, the intergranular critical current density in bulk samples (J(c)(b)) decreases by two orders of magnitude in the as-shocked state. This decrease in J(c)(b) is attributed to microfractures. However, if the shocked disk is annealed in O-2 then ground, sieved, and magnetically aligned, J(c) for H perpendicular to c-axis (J(c)(ab)) is enhanced two to three times over the unshocked value. This indicates that the increase in dislocations density does increase flux-pinning. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439. RP KRAMER, MJ (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 9 TC 3 Z9 3 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD NOV PY 1994 VL 23 IS 11 BP 1111 EP 1115 DI 10.1007/BF02649955 PG 5 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA PQ007 UT WOS:A1994PQ00700005 ER PT J AU KRAMER, MJ KARION, A DENNIS, KW PARK, M MCCALLUM, RW AF KRAMER, MJ KARION, A DENNIS, KW PARK, M MCCALLUM, RW TI ENHANCED SUPERCONDUCTIVITY IN ND1+XBA2-XCU3O7+DELTA BY LOW-OXYGEN PARTIAL-PRESSURE ANNEALING SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT 123rd TMS Annual Meeting: High Temperature Superconductivity CY FEB 27-MAR 03, 1994 CL SAN FRANCISCO, CA DE CHARGE TRANSFER; ND1-XBA2-XCU3O7+DELTA; OXYGEN PARTIAL PRESSURE; SOLID-SOLUTION ID SYSTEM AB Previous work has shown that unlike YBa2Cu3O7-delta (Y123), the Nd-Ba-Cu-O system exhibits a solid solution Nd1+xBa2-xCu3O7+delta (Nd123ss) for 0.04 less than or equal to x less than or equal to 0.6.(1-3) An earlier paper showed that although the superconducting properties decrease nonlinearly for increasing x, T-c can be varied by increasing the annealing temperature without changing the low temperature oxygen soak.(2) The changes in microstructure and T-c with increasing x are analogous with Y123 with increasing delta except that the total hole concentration remained constant. T-c was modeled in terms of oxygen disorder resulting from Nd3+ atoms on the Ba sites relocating chain oxygens to anti-chain sites. The variability in T-c as a function of x and processing conditions can be explained by the number of fourfold coordinated coppers on the chain sites. In this paper, the model has been further substantiated by processing in 1% O-2. The annealing in a reduced oxygen partial pressure followed by a 450 degrees C oxygen soak resulted in a marked increase in T-c compared to the 100% PO2 anneal. The low PO2 anneal favors pairing of Nd3+ substituting for Ba2+ to conserve oxygen ions, resulting in fewer disrupted fourfold-coordinated coppers thus increasing charge transfer from the planes to the chains. C1 YALE UNIV,NEW HAVEN,CT 06520. RP KRAMER, MJ (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 10 TC 22 Z9 22 U1 1 U2 2 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD NOV PY 1994 VL 23 IS 11 BP 1117 EP 1120 DI 10.1007/BF02649956 PG 4 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA PQ007 UT WOS:A1994PQ00700006 ER PT J AU TODT, VR SENGUPTA, S SHI, DG SAHM, PR MCGINN, PJ POEPPEL, RB HULL, JR AF TODT, VR SENGUPTA, S SHI, DG SAHM, PR MCGINN, PJ POEPPEL, RB HULL, JR TI PROCESSING OF LARGE YBA2CU3OX DOMAINS FOR LEVITATION APPLICATIONS BY A ND1+XBA2-XCU3OY-SEEDED MELT-GROWTH TECHNIQUE SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT 123rd TMS Annual Meeting: High Temperature Superconductivity CY FEB 27-MAR 03, 1994 CL SAN FRANCISCO, CA DE YBA2CU3OX; ND1+XBA2-XCU3OY; SEEDING; LEVITATION FORCE; MAGNETIZATION; MELT-TEXTURING ID HIGH-TEMPERATURE SUPERCONDUCTORS; YBACUO SUPERCONDUCTORS; MAGNETIC STIFFNESS; TEXTURED GROWTH; FORCE; JC AB YBa2Cu3Ox domains for levitation applications have been produced by a seeding technology: that includes Nd1+xBa2-xCu3Oy seeds and melt-processing technologies such as conventional melt-textured growth, melt-texturing with PtO2 and Y2BaCuO5 additions, and the new solid-liquid-melt-growth technology. Large domains (similar to 20 mm) with high levitation forces (F-1 up to 8.2 N) have been produced. The reproducibility of the results is good, and the capability of producing a large number of pellets in a single batch indicates good potential for the production of large amounts of this material. C1 UNIV CINCINNATI,DIV MAT SCI & ENGN,CINCINNATI,OH 45221. RHINE WESTFALIAN INST TECHNOL,ACCESS V FOUNDRY INST,D-52072 AACHEN,GERMANY. UNIV NOTRE DAME,CTR MAT SCI & ENGN,DEPT ELECT ENGN,NOTRE DAME,IN 46556. ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439. RP TODT, VR (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 28 TC 39 Z9 39 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD NOV PY 1994 VL 23 IS 11 BP 1127 EP 1130 DI 10.1007/BF02649958 PG 4 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA PQ007 UT WOS:A1994PQ00700008 ER PT J AU MILLER, DJ HU, JG REN, Z WANG, JH AF MILLER, DJ HU, JG REN, Z WANG, JH TI MICROSTRUCTURAL DEVELOPMENT AND CRITICAL CURRENTS IN LONG-LENGTH (TL, BI)-(SR, BA)-CA-CU-O WIRES SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT 123rd TMS Annual Meeting: High Temperature Superconductivity CY FEB 27-MAR 03, 1994 CL SAN FRANCISCO, CA DE CRITICAL CURRENT DENSITY; ELECTRON; GRAIN ALIGNMENT; MICROSCOPY; TL-BA-CA-CU-O ID PHASE; ALIGNMENT; TAPE AB Synthesis of long Tl-Ba-Ca-Cu-O wires has been achieved by in situ synthesis techniques. Substitutions of Bi for Tl and of Sr for Ba were found to greatly enhance formation of the superconducting phase. Detailed microstructural characterization was performed on wires processed under various conditions in order to elucidate the reaction mechanisms. In addition, microstructural studies were carried out to investigate the beneficial effects of uniaxial compression on critical current density. It was found that the in situ reaction follows a ''natural'' two-powder process with early formation of Tl-1212. This reaction pathway provides a mechanism for sintering and crack healing and protects existing Tl-1223 for regrowth. Intermediate heat treatment allows more complete advantage to be taken of the above processes, while subsequent pressing increases the density and promotes grain alignment with minimum damage. Further heat treatment sinters grains and allows completion of the transformation to Tl-1223. Elements of this process have been incorporated in a sandwich-type geometry using plate-like grains to promote additional grain alignment. C1 SUNY BUFFALO,DEPT CHEM,BUFFALO,NY 14214. RP MILLER, DJ (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Ren, Zhifeng/B-4275-2014 NR 19 TC 18 Z9 18 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD NOV PY 1994 VL 23 IS 11 BP 1151 EP 1158 DI 10.1007/BF02649962 PG 8 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA PQ007 UT WOS:A1994PQ00700012 ER PT J AU LI, YF LOOMANS, ME GORETTA, KC DORRIS, SE LANAGAN, MT POEPPEL, RB WENZLAFF, JJ WINANDY, PM YOUNGDAHL, CA BALACHANDRAN, U AF LI, YF LOOMANS, ME GORETTA, KC DORRIS, SE LANAGAN, MT POEPPEL, RB WENZLAFF, JJ WINANDY, PM YOUNGDAHL, CA BALACHANDRAN, U TI REACTIVE SINTERING OF BI2SR2CACU2OX SUPERCONDUCTORS SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT 123rd TMS Annual Meeting: High Temperature Superconductivity CY FEB 27-MAR 03, 1994 CL SAN FRANCISCO, CA DE BI-BASED SUPERCONDUCTORS; SINTERING; SYNTHESIS ID CA-CU-O; CURRENT-DENSITY; WIRES; TAPES; PHASE; MICROSTRUCTURE; PURE AB Three phase assemblages were used to produce Bi2Sr2CaCu2Ox (2212) during sintering: a mixture of 20% Ca-rich 2212 + 80% 2212, partially synthesized 2212, and Bi2Sr2CuOx (2201) + (1/2 Ca2CuO3 + 1/2 CuO) (denoted 0011). The mixture of 2201 + 0011 produced highly pure 2212 within 50 h of heating in air at approximate to 850 degrees C. Ag tubes were filled with a mixture of 2201 + 0011 and worked into tapes by a powder-in-tube process. Heat treatments produced microstructures consisting of small, highly textured 2212 grains. T-c values were approximate to 70K. Transport Je values at 4.2K were approximate to 10(4) A/cm(2). C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP LI, YF (reprint author), ARGONNE NATL LAB,DIV ENERGY TECHNOL,ARGONNE,IL 60439, USA. NR 23 TC 3 Z9 3 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD NOV PY 1994 VL 23 IS 11 BP 1163 EP 1167 DI 10.1007/BF02649964 PG 5 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA PQ007 UT WOS:A1994PQ00700014 ER PT J AU SELVAMANICKAM, V GOYAL, A KROEGER, DM AF SELVAMANICKAM, V GOYAL, A KROEGER, DM TI A NEW PROCESS WITH A POTENTIAL TO RAPIDLY TEXTURE BULK YBA2CU3OX SUPERCONDUCTOR SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT 123rd TMS Annual Meeting: High Temperature Superconductivity CY FEB 27-MAR 03, 1994 CL SAN FRANCISCO, CA DE CRITICAL CURRENT DENSITY; RECRYSTALLIZATION; TEXTURE ID HIGH-CURRENT DENSITY; HIGH-JC; MICROSTRUCTURE AB A new process has been developed to texture bulk YBa2Cu3Ox superconductors at temperatures about 100 degrees C below the peritectic temperature. The texture is achieved in this process by directional recrystallization of compacts fabricated from quenched YBCO powders. Isothermal recrystallization of quenched precursors at 890 degrees C for 3 min is found to result in the formation of more than 75% of YBa2Cu3Ox phase without any Y2BaCuO5. Recrystallization at higher temperatures leads to rapid formation of fine Y2BaCuO5 precipitates in addition to YBa2Cu3Ox. The formation of YBa2Cu3Ox increases with increasing heating rates. Directional recrystallization at 10 mm/h results in a well-textured microstructure with the YBa(2)Cu(3)Ox grains oriented parallel to the sample length. The magnetic field dependence of the critical current density at 77K of the directionally recrystallized material compares well with that of melt-textured YBCO and is superior to that of magnetically aligned and sintered YBCO. RP SELVAMANICKAM, V (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 19 TC 1 Z9 1 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD NOV PY 1994 VL 23 IS 11 BP 1169 EP 1173 DI 10.1007/BF02649965 PG 5 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA PQ007 UT WOS:A1994PQ00700015 ER PT J AU GOYAL, A SPECHT, ED WANG, ZL KROEGER, DM SUTLIFF, JA TKACZYK, JE DELUCA, JA MASUR, L RILEY, GN AF GOYAL, A SPECHT, ED WANG, ZL KROEGER, DM SUTLIFF, JA TKACZYK, JE DELUCA, JA MASUR, L RILEY, GN TI DEPENDENCE OF CRITICAL-CURRENT DENSITY ON MICROSTRUCTURE AND PROCESSING OF HIGH-T-C SUPERCONDUCTORS SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT 123rd TMS Annual Meeting: High Temperature Superconductivity CY FEB 27-MAR 03, 1994 CL SAN FRANCISCO, CA DE BI-2212; BI-2223; CRITICAL CURRENT DENSITY; TEXTURE; TL-1223; Y-123 ID GRAIN-BOUNDARIES; YBA2CU3O7-DELTA; BICRYSTALS AB Microstructural origins for reduced weak-link behavior in high-J(c) melt-processed YBCO, spray pyrolyzed thick films of Tl-1223, metallic precursor Y-124 polycrystalline powder-in-tube (PIT) wires and PIT Bi-2212/2223 are discussed. Since the materials studied are the highest J(c), polycrystalline, high-T-c superconductors fabricated worldwide, the results provide important guidelines for further improvements in superconducting properties, thereby enabling practical applications of these materials. It is found that strongly linked current flow within domains of melt-processed 123 occurs effectively through a single crystal path. In c-axis oriented, polycrystalline Tl-1223 thick films, local in-plane texture has been found to play a crucial role in the reduced weak-link behavior. Formation of ''colonies'' of grains with a common c-axis and modest in-plane misorientation was observed. Furthermore, a colony boundary in general has a varying misorientation along the boundary. Large regions comprised primarily of low angle boundaries were observed. Percolative transport through a network of such small angle boundaries appears to provide the nonweak-linked current path. Although powder-in-tube BSCCO 2212 and 2223 also appear to have a ''colony'' microstructure, there are some important differences. Colonies in BSCCO consist of stacks of grains with similar c-axis orientation in contrast to colonies in Tl-1223 films where few grains are stacked on top of one another. Furthermore, most grains within a colony in BSCCO have the same lateral dimensions as that of the colony, resulting largely in ''twist'' boundaries. Further microstructural characterization of high-J(c) PIT 2212 and 2223 is currently underway. In the case of Y-124 wires, weak macroscopic in-plane texture is found. Additional measurements are underway to determine if a sharper, local in-plane texture also exists. It is found that in three of the four types of superconductors studied, reduced weak-link behavior can be ascribed to some degree of biaxial alignment between grains, either on a ''local'' or a ''global'' scale. C1 GE CO,CORP RES & DEV,SCHENECTADY,NY 12301. AMER SUPERCOND CORP,WESTBOROUGH,MA 01581. RP GOYAL, A (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,MS 6116,OAK RIDGE,TN 37831, USA. RI Wang, Zhong Lin/E-2176-2011; Specht, Eliot/A-5654-2009 OI Wang, Zhong Lin/0000-0002-5530-0380; Specht, Eliot/0000-0002-3191-2163 NR 23 TC 15 Z9 15 U1 0 U2 4 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD NOV PY 1994 VL 23 IS 11 BP 1191 EP 1197 DI 10.1007/BF02649968 PG 7 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA PQ007 UT WOS:A1994PQ00700018 ER PT J AU WOODS, LM SILVESTRE, P THIAGARAJAN, P PATRIZI, GA ROBINSON, GY JONES, KM ALJASSIM, M AF WOODS, LM SILVESTRE, P THIAGARAJAN, P PATRIZI, GA ROBINSON, GY JONES, KM ALJASSIM, M TI PHOTOLUMINESCENCE AND INTERFACE ABRUPTNESS IN INGAASP/INGAASP QUANTUM-WELLS SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE GAS SOURCE MOLECULAR BEAM EPITAXY (GSMBE); INGAASP; PHOTOLUMINESCENCE ID EPITAXIAL-GROWTH; LUMINESCENCE; ABSORPTION; DEPENDENCE; INGAASP AB Quantum well (QW) structures consisting of InGaAsP wells and InGaAsP barriers grown by gas-source molecular beam epitaxy have been examined by low temperature photoluminescence (PL) in order to evaluate the contributions of compositional fluctuations in the quaternary alloy and of interface roughness to the PL linewidth. The well material was InGaAsP with a bandgap corresponding to a wavelength of 1.3 mu m and the barrier material was InGaAsP of 1.15 mu m The theory for QW excitonic linewidths as a function of well thickness L(z) due to fluctuations in alloy composition has been extended to include the case of the quaternary InGaAsP barrier. If the interfaces are atomically abrupt, the linewidth is dominated by compositional fluctuations in the well at large L(z) and compositional fluctuations in the barrier at small L(z). The theory predicts a weak dependence of the linewidth on L(z) since the composition of the well and barrier are similar. For rough heterointerfaces, the theory indicates the usual increase in linewidth with decreasing L(z). Photoluminescence measurements at 13K in arrays of single InGaAsP/InGaAsP QWs with L(z) from 1.0 to 6.0 nm show only a weak variation of the full width at half maximum (FWHM) with L(z), in agreement with the theory for smooth interfaces. Furthermore, the lowest measured FWHM of 8.9 meV was found for a narrow well of L(z) = 1.8 nm, indicating the InGaAsP/InGaAsP interfaces are smooth and that the PL linewidth is dominated by compositional fluctuations. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP WOODS, LM (reprint author), COLORADO STATE UNIV,DEPT ELECT ENGN,FT COLLINS,CO 80523, USA. NR 20 TC 13 Z9 13 U1 1 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD NOV PY 1994 VL 23 IS 11 BP 1229 EP 1233 DI 10.1007/BF02649974 PG 5 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA PQ007 UT WOS:A1994PQ00700024 ER PT J AU CLARK, DE NIEVES, LA AF CLARK, DE NIEVES, LA TI AN INTERREGIONAL HEDONIC ANALYSIS OF NOXIOUS FACILITY IMPACTS ON LOCAL WAGES AND PROPERTY-VALUES SO JOURNAL OF ENVIRONMENTAL ECONOMICS AND MANAGEMENT LA English DT Article ID VALUING AMENITIES; AIR-QUALITY; PRICES; MIGRATION; CHOICE; DEMAND; MARKET; DIFFERENTIALS; EQUILIBRIUM; LIFE AB Since the early work of Rosen, Roback, and more recently Blomquist, Berger, and Hoehn, economists have recognized that local environmental amenities influence wage rates and property values jointly. Moreover, local differentials in these prices can be used to implicitly value local amenities. Unfortunately, much of the empirical work on noxious facilities has focused on a narrow range of facility types, often within a single city. Generally, distance from the facility is used to proxy exposure to the disamenity, although it is possible that the mere existence of a noxious facility in a region has an impact on local residents. We employ an intercity hedonic model to measure the joint property value and wage effects of a broad range of noxious facilities. Using Public Use Microdata from the 1980 United States Census, we show that property values and/or wages are significantly influenced by the existence of noxious facilities. Calculated implicit prices reveal that local residents are most averse to the presence of petrochemical refineries and nuclear power plants. (C) 1994 Academic Press, Inc. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP CLARK, DE (reprint author), MARQUETTE UNIV,DEPT ECON,MILWAUKEE,WI 53233, USA. NR 57 TC 22 Z9 22 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 0095-0696 J9 J ENVIRON ECON MANAG JI J.Environ.Econ.Manage. PD NOV PY 1994 VL 27 IS 3 BP 235 EP 253 DI 10.1006/jeem.1994.1036 PG 19 WC Business; Economics; Environmental Studies SC Business & Economics; Environmental Sciences & Ecology GA PR272 UT WOS:A1994PR27200003 ER PT J AU MCCOMAS, DJ ELPHIC, RC MOLDWIN, MB THOMSEN, MF AF MCCOMAS, DJ ELPHIC, RC MOLDWIN, MB THOMSEN, MF TI PLASMA OBSERVATIONS OF MAGNETOPAUSE CROSSINGS AT GEOSYNCHRONOUS ORBIT SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID BOW SHOCK; MAGNETOSHEATH; MAGNETOSPHERE; ANALYZER; LOCATION; SHAPE; FLOW AB The entire three-spacecraft magnetospheric plasma analyzer (MPA) data set has been examined for intervals of magnetosheath plasma at geosynchronous orbit. Over the 6 1/2 spacecraft years of data reviewed, 916 5-min intervals of magnetosheath plasma observations were identified and cataloged. Unlike previous studies that suggested that magnetopause encounters were far more likely on the prenoon than postnoon side at geosynchronous orbit, this study examines three independent lines of evidence and finds that only a small asymmetry (in this same sense) exists. On a statistical basis, a local time of similar to 1130 is both the median and mean for our magnetosheath observations; this local time is simply consistent with the effects of an aberrated solar wind direction due to the motion of the Earth around the Sun. Simultaneous multipoint observations across both sides of local noon are also consistent with a small offset due to aberration of the magnetopause. Finally, we examined the locations of the dawn-dusk flow reversals for a number of cases where one of the geosynchronous spacecraft was outside the magnetopause in the magnetosheath flow. These flow reversals tended to occur near local noon, again indicating that in contrast to previous findings, no large asymmetry exists. RP MCCOMAS, DJ (reprint author), LOS ALAMOS NATL LAB,SPACE & ATMOSPHER SCI GRP,LOS ALAMOS,NM 87545, USA. RI Moldwin, Mark/F-8785-2011 OI Moldwin, Mark/0000-0003-0954-1770 NR 16 TC 28 Z9 28 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD NOV 1 PY 1994 VL 99 IS A11 BP 21249 EP 21255 DI 10.1029/94JA01094 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PP433 UT WOS:A1994PP43300006 ER PT J AU ANGELOPOULOS, V KENNEL, CF CORONITI, FV PELLAT, R KIVELSON, MG WALKER, RJ RUSSELL, CT BAUMJOHANN, W FELDMAN, WC GOSLING, JT AF ANGELOPOULOS, V KENNEL, CF CORONITI, FV PELLAT, R KIVELSON, MG WALKER, RJ RUSSELL, CT BAUMJOHANN, W FELDMAN, WC GOSLING, JT TI STATISTICAL CHARACTERISTICS OF BURSTY BULK FLOW EVENTS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID CENTRAL PLASMA SHEET; ENERGETIC ION ANISOTROPIES; SUBSTORM MODELS; EARTHS MAGNETOTAIL; GEOMAGNETIC TAIL; ISEE-1; IRM AB Using a common methodology to analyze data from the AMPTE/IRM and ISEE 2 satellites we report on the statistical properties of bursty bulk flow events (BBFs) in the inner plasma sheet (IFS). A positive correlation between BBFs and the AE index suggests that BBFs are predominantly geomagnetically active time phenomena. Earthward BBFs are more frequent close to midnight and away from Earth, up to a distance of similar to 19 R(E). Tailward BBFs are very infrequent in the IRM data set and somewhat less infrequent in the ISEE 2 data set in the region of the satellites' spatial overlap, possibly due to the more active conditions prevailing during the ISEE 2 mission in that region. However, in both data sets the ratio of tailward to earthward BBFs increases with distance from Earth; more than 20% of all BBFs are anti-sunward tailward of X = -19R(E) in the ISEE 2 data set. BBFs are responsible for 60-100% of the measured earthward transport of mass, energy and magnetic flux past the satellite in the regions of maximum occurrence rate, even though they last approximately 10-15% of the IFS observation time there. Thus BBFs represent the primary transport mechanism at those regions. The one-to-one correspondence between BBFs and substorm phase, as well as the relative contribution of BBFs to the total transport observed during substorms are questions that await further investigation based on multi instrument studies of individual events. C1 UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,DEPT GEOPHYS & PLANETARY PHYS,LOS ANGELES,CA 90024. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. MAX PLANCK INST EXTRATERR PHYS,W-8046 GARCHING,GERMANY. RI Baumjohann, Wolfgang/A-1012-2010; Kivelson, Margaret/I-9019-2012 OI Baumjohann, Wolfgang/0000-0001-6271-0110; Kivelson, Margaret/0000-0003-3859-8581 NR 41 TC 457 Z9 468 U1 3 U2 19 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD NOV 1 PY 1994 VL 99 IS A11 BP 21257 EP 21280 DI 10.1029/94JA01263 PG 24 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PP433 UT WOS:A1994PP43300007 ER PT J AU JACOBSON, AR AF JACOBSON, AR TI MIDDLE AND UPPER-ATMOSPHERE RADAR OBSERVATIONS OF IONOSPHERIC DENSITY GRADIENTS PRODUCED BY GRAVITY-WAVE PACKETS - COMMENT SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Editorial Material ID ELECTRON CONTENT; DISTURBANCES RP JACOBSON, AR (reprint author), LOS ALAMOS NATL LAB,SPACE & ATMOSPHER SCI GRP,MAIL STOP D 466,LOS ALAMOS,NM 87545, USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD NOV 1 PY 1994 VL 99 IS A11 BP 21411 EP 21413 DI 10.1029/94JA02208 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PP433 UT WOS:A1994PP43300019 ER PT J AU LU, PY WASSOM, JS AF LU, PY WASSOM, JS TI INFORMATION RESOURCES FOR CHEMICAL TOXICOLOGY AND REGULATION SO JOURNAL OF HAZARDOUS MATERIALS LA English DT Article ID GENE-TOX PROGRAM AB During the last three decades, there has been an overwhelming increase in scientific and technical information. This information increase has heralded an age of unprecedented advancements in our knowledge about the toxicological sciences and the agents, particularly chemicals, that have been evaluated for the induction of untoward biological activity. Much of the information published is stored in computers in various forms for subsequent use and analysis. This information base, although and invaluable resource, presents an enormous challenge to those individuals requiring access to specific toxicology information for use in association with regulatory decision making. With large amounts of government funds being devoted to health and environmental research programs, the rate of growth for toxicology literature is expected to increase every year. To organize this growing literature and to make it easily accessible to users, different types of information systems have been developed. This paper focuses on those information systems that in the authors' opinions provide the best opportunity for accessing the toxicology literature for application in assessing potential human health hazards and chemical regulation. RP LU, PY (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SCI RES,BIOMED & ENVIRONM INFORMAT ANAL SECT,1066 COMMERCE PK,OAK RIDGE,TN 37830, USA. NR 11 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3894 J9 J HAZARD MATER JI J. Hazard. Mater. PD NOV PY 1994 VL 39 IS 2 BP 225 EP 243 DI 10.1016/0304-3894(94)00050-6 PG 19 WC Engineering, Environmental; Engineering, Civil; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA PP992 UT WOS:A1994PP99200009 ER PT J AU STRONGGUNDERSON, JM PALUMBO, AV AF STRONGGUNDERSON, JM PALUMBO, AV TI ALTERNATIVE METHOD FOR RAPIDLY SCREENING MICROBIAL ISOLATES FOR THEIR POTENTIAL TO DEGRADE VOLATILE CONTAMINANTS SO JOURNAL OF INDUSTRIAL MICROBIOLOGY LA English DT Article DE BIOREMEDIATION; VOLATILE ORGANIC CONTAMINANTS; CARBON TETRACHLORIDE; TOLUENE; O-XYLENE ID MICROORGANISMS AB A method is described for rapidly screening the metabolic potential of bacteria to oxidize semivolatile and volatile compounds as a sole carbon source. The method is based on an automated system that utilizes Microplates (TM) manufactured by Biolog, Inc. (Hayward, CA, USA). This system detects bacterial respiratory activity from the oxidation of a carbon source introduced in volatile form. This is in contrast to the original design, which is based on inoculating a carbon source directly into each well. The 96-well (MT) microtiter plates contain nutrients and a tetrazolium dye. When a bacterial species is capable of oxidizing a volatile carbon substrate, the dye turns purple, and a spectrophotometric plate reader quantifies the response. As a test of this method 150 isolates, including isolates known to degrade some of the test compounds and negative controls were evaluated for their potential to oxidize carbon tetrachloride, toluene, and o-xylene. Thirty-seven isolates (25%) were qualitatively identified as contaminant oxidizers, and thirteen of these (35%) showed significant degradation capabilities for both toluene and o-xylene. RP STRONGGUNDERSON, JM (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37830, USA. RI Palumbo, Anthony/A-4764-2011 OI Palumbo, Anthony/0000-0002-1102-3975 NR 18 TC 9 Z9 9 U1 0 U2 0 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HANTS, ENGLAND RG21 2XS SN 0169-4146 J9 J IND MICROBIOL JI J. Indust. Microbiol. PD NOV PY 1994 VL 13 IS 6 BP 361 EP 366 DI 10.1007/BF01577220 PG 6 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA PY266 UT WOS:A1994PY26600005 PM 7765668 ER PT J AU BROCK, D LEE, WJ SEGALMAN, D WITKOWSKI, M AF BROCK, D LEE, WJ SEGALMAN, D WITKOWSKI, M TI A DYNAMIC-MODEL OF A LINEAR-ACTUATOR BASED ON POLYMER HYDROGEL SO JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES LA English DT Article ID GELS AB The design and analysis of a series of linear actuators based on polymer hydrogel is presented. The actuators use arrays of pH sensitive gel fibers together with a fluid irrigation system to locally and rapidly regulate the composition of the solution. A dynamic model is constructed for one of the linear actuators, which includes the polymer gel, fluidic system, and transmission mechanics. Emphasis in the design and mechanical modeling of the actuators is placed on the complete system including not only the polymer gel, but also on the containment system, irrigation scheme, and servo valving system. C1 SANDIA NATL LABS,DEPT STRUCT DYNAM & VIBRAT CONTROL,DIV 1434,ALBUQUERQUE,NM 87185. MIT,ARTIFICIAL INTELLIGENCE LAB,CAMBRIDGE,MA 02139. MIT,DEPT MECH ENGN,CAMBRIDGE,MA 02139. NR 9 TC 62 Z9 64 U1 0 U2 6 PU TECHNOMIC PUBL CO INC PI LANCASTER PA 851 NEW HOLLAND AVE, BOX 3535, LANCASTER, PA 17604 SN 1045-389X J9 J INTEL MAT SYST STR JI J. Intell. Mater. Syst. Struct. PD NOV PY 1994 VL 5 IS 6 BP 764 EP 771 DI 10.1177/1045389X9400500606 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA QX170 UT WOS:A1994QX17000006 ER PT J AU CHEN, E CLEAVER, JE WEBER, CA PACKMAN, S BARKOVICH, AJ KOCH, TK WILLIAMS, ML GOLABI, M PRICE, VH AF CHEN, E CLEAVER, JE WEBER, CA PACKMAN, S BARKOVICH, AJ KOCH, TK WILLIAMS, ML GOLABI, M PRICE, VH TI TRICHOTHIODYSTROPHY - CLINICAL SPECTRUM, CENTRAL-NERVOUS-SYSTEM IMAGING, AND BIOCHEMICAL-CHARACTERIZATION OF 2 SIBLINGS SO JOURNAL OF INVESTIGATIVE DERMATOLOGY LA English DT Article; Proceedings Paper CT 42nd Annual Symposium on the Biology of Skin - The Genetics of Skin Disease CY JUL 24-28, 1993 CL SNOWMASS VILLAGE, CO DE DYSMYELINATION; XERODERMA PIGMENTOSUM; SULFUR MATRIX PROTEIN ID NUCLEOTIDE-EXCISION-REPAIR; DEFICIENT BRITTLE HAIR; XERODERMA-PIGMENTOSUM; DNA-REPAIR; COMPLEMENTATION GROUP; COCKAYNES-SYNDROME; GENE; ERCC2; MATURATION; CHROMOSOME AB Trichothiodystrophy (TTD), an autosomal recessive disorder characterized by sulfur-deficient brittle hair, identifies a group of genetic disorders with an altered synthesis of high-sulfur matrix proteins and a defect in excision repair of ultraviolet damage in fibroblasts of most TTD patients. In contrast to patients with xeroderma pigmentosum (XP), TTD patients do not have an increased frequency of skin cancers. TTD patients may be grouped into four categories: 1) those without photosensitivity and without a defect in excision repair of UV damage; 2) those without photosensitivity and with an excision-repair defect in the same gene as in XP-D (complementation group D); 3) those with photosensitivity and with the XP-D repair defect; 4) those with photosensitivity and with a repair defect distinct from that in XP-D. We present a brother and sister in the third category of TTD. Clinically, the patients have brittle hair, short stature, ichthyosis, photosensitivity, nail and dental dysplasias, cataracts, mental retardation, and pyramidal tract abnormalities. Diagnosis was made by hair mount, which shows the characteristic banding pattern with polarizing microscopy, and by hair amino acid analysis, which demonstrated decreased high-sulfur matrix proteins. Fibroblasts cultured from skin biopsies had a marked DNA excision repair defect similar to the repair defect seen in XP-D. We have documented a unique dysmyelinating disorder on magnetic resonance imaging of the brain that might explain their mental retardation, marked hyperactivity, and neurologic deficits. Following the discovery that the human excision repair cross complementing rodent ultraviolet group 2 (ERCC2) gene is able to correct the ultraviolet sensitivity of XP-I) cell strains, the ERCC2 cDNA from previous TTD patients was sequenced and shows frameshifts, deletions and point mutations in the ERCC2 gene. Molecular analysis of our patients is in progress. Molecular analysis of the defects in ERCC2 in clinically distinct patients with XP, XP/Cockayne's syndrome, and TTD may provide insight into the molecular mechanisms of these genetically related but clinically distinct disorders. C1 UNIV CALIF SAN FRANCISCO,MED CTR,DEPT DERMATOL,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT PEDIAT,DIV GENET,RADIOBIOL & ENVIRONM HLTH LAB,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT RADIOL,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT NEUROL,SAN FRANCISCO,CA 94143. LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,LIVERMORE,CA. FU NIGMS NIH HHS [5 T32 GM07085-17] NR 30 TC 20 Z9 20 U1 0 U2 0 PU BLACKWELL SCIENCE INC PI CAMBRIDGE PA 238 MAIN ST, CAMBRIDGE, MA 02142 SN 0022-202X J9 J INVEST DERMATOL JI J. Invest. Dermatol. PD NOV PY 1994 VL 103 IS 5 SU S BP S154 EP S158 DI 10.1111/1523-1747.ep12399493 PG 5 WC Dermatology SC Dermatology GA PU666 UT WOS:A1994PU66600029 PM 7963680 ER PT J AU SCHATZ, KW FTHENAKIS, VM AF SCHATZ, KW FTHENAKIS, VM TI MITIGATION OF HYDROGEN-FLUORIDE AEROSOLS BY DRY POWDERS SO JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES LA English DT Article DE HYDROGEN FLUORIDE AEROSOL; POWDER MITIGATION; LABORATORY-SCALE TESTS AB Fluid bed tests were used to determine overall reaction rates for eight different dry powders of low hazard and toxicity before and after reaction with HF. In flow chamber tests, a representative oxide, hydroxide and carbonate were used to measure the efficiency of mitigation of an HF aerosol cloud. The results show that dry powders provide a valid alternative to water spray mitigation. Powder efficiencies are higher than water efficiencies at constant weight ratio. At present, no attempt has been made to provide any technical designs or layouts for powder mitigation systems. However, the technology for smaller systems is available through manufacturers of dry powder chemical fire extinguisher equipment. When these powders are kept dry and under nitrogen atmosphere, a shelf life of several years can be expected. C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. RP SCHATZ, KW (reprint author), MOBIL RES & DEV CORP,POB 1026,PRINCETON,NJ 08543, USA. NR 11 TC 1 Z9 1 U1 1 U2 1 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0950-4230 J9 J LOSS PREVENT PROC JI J. Loss Prev. Process Ind. PD NOV PY 1994 VL 7 IS 6 BP 451 EP 456 DI 10.1016/0950-4230(94)80002-2 PG 6 WC Engineering, Chemical SC Engineering GA PM726 UT WOS:A1994PM72600002 ER PT J AU LUND, A NICHOLSON, DG LAMBLE, G BEAGLEY, B AF LUND, A NICHOLSON, DG LAMBLE, G BEAGLEY, B TI X-RAY-ABSORPTION SPECTROSCOPIC STUDY OF THE ALPO4-5 - FERROCENE INCLUSION COMPOUND AND ITS THERMALLY DECOMPOSED PRODUCTS SO JOURNAL OF MATERIALS CHEMISTRY LA English DT Article ID ALUMINOPHOSPHATE MOLECULAR-SIEVES; CURVED-WAVE THEORY; INTRAZEOLITE ORGANOMETALLICS; EXTERNAL CONFINEMENT; EXAFS CALCULATIONS; CRYSTAL-STRUCTURE; METAL GUESTS; ZEOLITE; FE; CHEMISTRY AB The synthesis and decomposition of an inclusion compound, AlPO4:Fe(C5H5)2 is reported. This, and the decomposition products have been characterised by extended X-ray absorption fine structure spectroscopy. The clustering of iron atoms either through Fe-Fe or Fe-O-Fe interactions is shown to be absent. Instead, Fe(III) is sited within the double 6-rings of the 12-ring system. A model for distortions of the local lattice about Fe(III) is proposed. C1 UNIV MANCHESTER,INST SCI & TECHNOL,DEPT CHEM,MANCHESTER M60 1QD,LANCS,ENGLAND. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP LUND, A (reprint author), UNIV TRONDHEIM,DEPT CHEM,N-7055 DRAGVOLL,NORWAY. RI Nicholson, David/I-3749-2013 NR 47 TC 8 Z9 8 U1 0 U2 2 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0959-9428 J9 J MATER CHEM JI J. Mater. Chem. PD NOV PY 1994 VL 4 IS 11 BP 1723 EP 1730 DI 10.1039/jm9940401723 PG 8 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA PR923 UT WOS:A1994PR92300009 ER PT J AU MIRKARIMI, PB MCCARTY, KF MEDLIN, DL WOLFER, WG FRIEDMANN, TA KLAUS, EJ CARDINALE, GF HOWITT, DG AF MIRKARIMI, PB MCCARTY, KF MEDLIN, DL WOLFER, WG FRIEDMANN, TA KLAUS, EJ CARDINALE, GF HOWITT, DG TI ON THE ROLE OF IONS IN THE FORMATION OF CUBIC BORON-NITRIDE FILMS BY ION-ASSISTED DEPOSITION SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID STRESS-INDUCED FORMATION; THIN-FILMS; COMPRESSIVE-STRESS; INTRINSIC STRESS; BEAM DEPOSITION; CARBON-FILMS; BN FILMS; DIAMOND; GROWTH; ENERGY AB We have investigated how ion irradiation can selectively promote the formation of dense sp(3)-bonded cubic boron nitride (cBN) over the graphite-like sp(2)-bonded phases. We have conducted a series of experiments using ion-assisted pulsed laser deposition in which either the ion mass (m(ion)) or ion energy (E) was varied in conjunction with the ratio of ion flux to depositing atom flux (J/a). For a fixed ion energy and mass, there is a critical J/a above which cBN formation is initiated, a window of J/a values in which large cBN percentages are obtained, and a point at which J/a is so large that the resputter and deposition rates balance and there is no net film deposition, in agreement with Kester and Messier. As do Kester and Messier, we find that cBN formation is controlled by a combination of experimental parameters that scale with the momentum of the ions. However, unlike Kester and Messier, we do not find that cBN formation scales with the maximum momentum that can be transferred in a single binary collision, as either incorrectly formulated by Targove and Macleod and used by Kester and Messier, or as correctly formulated. Instead we observe that cBN formation best scales with the total momentum of the incident ions, (m(ion)E)(1/2). We also consider the mechanistic origins of this (m(ion)E)(1/2) dependence. Computer simulations of the interaction of ions with BN show that cBN formation cannot be simply scaled to parameters such as the number of atomic displacements or the number of vacancies produced by the ion irradiation. A critical examination of the literature shows that none of the proposed models satisfactorily accounts for the observed (m(ion)E)(1/2) dependence. We present a quantitative model that describes the generation of stress during ion-assisted film growth. The model invokes a kinetic approach to defect production and loss. We apply a simplified version of the model to cBN synthesis, and find that it predicts an approximate (m(ion)E)(1/2) dependence for cBN formation. C1 UNIV CALIF DAVIS, DEPT CHEM ENGN & MAT SCI, DAVIS, CA 95616 USA. RP MIRKARIMI, PB (reprint author), SANDIA NATL LABS, LIVERMORE, CA 94550 USA. RI McCarty, Kevin/F-9368-2012 OI McCarty, Kevin/0000-0002-8601-079X NR 68 TC 183 Z9 186 U1 1 U2 12 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD NOV PY 1994 VL 9 IS 11 BP 2925 EP 2938 DI 10.1557/JMR.1994.2925 PG 14 WC Materials Science, Multidisciplinary SC Materials Science GA PT199 UT WOS:A1994PT19900026 ER PT J AU CHAMBERS, SA TRAN, TT HILEMAN, TA AF CHAMBERS, SA TRAN, TT HILEMAN, TA TI MOLECULAR-BEAM HOMOEPITAXIAL GROWTH OF MGO(001) SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID X-RAY PHOTOELECTRON; HIGH-ENERGY AUGER; ARTIFICIAL SUPERLATTICE; REACTIVE EVAPORATION; MAGNETIC-PROPERTIES; SURFACE; DIFFRACTION; FILMS; CRYSTALLOGRAPHY; ELECTRON AB We describe homoepitaxial growth and detailed in situ characterization of MgO(001). We have used, for the first time, high-speed Auger electron spectroscopy as a real-time probe of film composition during growth. Excellent short-range and long-range crystallographic order are achieved in films grown to a thickness of several hundred angstroms in the substrate temperature range of 450 degrees C to 750 degrees C. Moreover, the films become more laminar as the growth temperature increases, suggesting that MgO grows homoepitaxially by the step-flow growth mechanism at elevated temperature. The surfaces of films grown at 650 degrees and 750 degrees C are smoother than those obtained by cleaving MgO(001). RP CHAMBERS, SA (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 26 TC 49 Z9 49 U1 1 U2 4 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD NOV PY 1994 VL 9 IS 11 BP 2944 EP 2952 DI 10.1557/JMR.1994.2944 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA PT199 UT WOS:A1994PT19900028 ER PT J AU PERRY, DL BERDAHL, P PERRINO, C AF PERRY, DL BERDAHL, P PERRINO, C TI MAGNETIC CHARACTERIZATION OF CALCIUM-NICKEL-POTASSIUM OXIDE CATALYSTS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID LOW-TEMPERATURE OXYDEHYDROGENATION; METHANE; PARTICLES; SUPERPARAMAGNETISM; SELECTIVITY; CONVERSION; FILMS AB SQUID magnetometer characterization of Ca-Ni-K-O catalyst materials reveals complex magnetic behavior. The magnetic properties are generally determined by the antiferromagnetic material NiO, but samples with traces of elemental nickel show marked effects of ferromagnetism. Potassium doping enhances the formation of metallic nickel. Further deviations from bulk NiO properties can be attributed to NiO particle size effects (superparamagnetism) and to the presence of paramagnetic impurities, possibly Ni3+ ions. RP PERRY, DL (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 27 TC 2 Z9 2 U1 0 U2 2 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD NOV PY 1994 VL 9 IS 11 BP 2993 EP 2997 DI 10.1557/JMR.1994.2993 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA PT199 UT WOS:A1994PT19900035 ER PT J AU ALLARD, LF VOELKL, E KALAKKAD, DS DATYE, AK AF ALLARD, LF VOELKL, E KALAKKAD, DS DATYE, AK TI ELECTRON HOLOGRAPHY REVEALS THE INTERNAL STRUCTURE OF PALLADIUM NANO-PARTICLES SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID SMALL METAL PARTICLES AB Phase images of palladium particles 5-15 nm in diameter were reconstructed from electron holograms acquired using the coherent beam of a field emission transmission electron microscope. The Pd particles were supported on amorphous silica microspheres, 0.2 mu m in diameter. A central contrast feature, suggestive of an internal void, was visible on most of the Pd particles. The phase profiles obtained from the holograms matched computed phase profiles confirming the existence of an internal void in these nano-particles. This is the first observation where internal morphology at the nano-scale has been unambiguously determined. While the observed voids are similar in scale to those occurring in recently reported hollow nanometre-sized particles, such as graphite polyhedra [9, 10], this represents the first report of such voids in metallic particles that are single crystals. C1 UNIV NEW MEXICO,DEPT CHEM & NUCL ENGN,ALBUQUERQUE,NM 87131. RP ALLARD, LF (reprint author), OAK RIDGE NATL LAB,HIGH TEMP MAT LAB,OAK RIDGE,TN 37831, USA. OI Datye, Abhaya/0000-0002-7126-8659 NR 13 TC 16 Z9 16 U1 0 U2 4 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD NOV 1 PY 1994 VL 29 IS 21 BP 5612 EP 5614 DI 10.1007/BF00349955 PG 3 WC Materials Science, Multidisciplinary SC Materials Science GA PR249 UT WOS:A1994PR24900015 ER PT J AU KATO, H KODAMA, T TSUJI, M TAMAURA, Y CHANG, SG AF KATO, H KODAMA, T TSUJI, M TAMAURA, Y CHANG, SG TI DECOMPOSITION OF CARBON-DIOXIDE TO CARBON BY HYDROGEN-REDUCED NI(II)-BEARING FERRITE SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID AIR OXIDATION; FE(OH)2 SUSPENSIONS; MAGNETITE; FE3O4; CO2 AB Hydrogen-activated Ni(II)-bearing ferrite, Ni0.372+Fe0.492+Fe2.093+O4.00, showed a high rate of decomposition of carbon dioxide to carbon at 300 degrees C. This is based on the redox process of the Ni(II)-bearing ferrite with the spinel type of crystal structure. The rates of both activation by hydrogen gas and oxidation in carbon dioxide gas were much improved in the Ni(II)-bearing ferrite. The rate of decomposition was 0.178 mol h(-1) for the activated Ni(II)-bearing ferrite and 0.005 92 mol h(-1) for the activated magnetite in the batch mode, being 30 times larger. The rate of carbon dioxide decomposition was 16 times higher in the flow system in comparison with that of the activated magnetite. C1 TOKYO INST TECHNOL,CARBON RECYCLING & UTILIZAT RES CTR,DEPT CHEM,MEGURO KU,TOKYO 152,JAPAN. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 22 TC 44 Z9 45 U1 0 U2 1 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD NOV 1 PY 1994 VL 29 IS 21 BP 5689 EP 5692 DI 10.1007/BF00349965 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA PR249 UT WOS:A1994PR24900025 ER PT J AU FRIEDBERG, R LEE, TD PANG, Y AF FRIEDBERG, R LEE, TD PANG, Y TI A NEW LATTICE FORMULATION OF THE CONTINUUM SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article ID NEUTRINOS; ABSENCE; PROOF AB A new lattice formulation of the continuum is presented, which can be applied to quantum or classical field theories in any space-time dimension. The method is illustrated with an application to relativistic nontopological solitons. This approach also provides an effective means of removing the spurious lattice fermion degenerate solutions for the Dirac equation. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP FRIEDBERG, R (reprint author), COLUMBIA UNIV,NEW YORK,NY 10027, USA. NR 7 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 0022-2488 J9 J MATH PHYS JI J. Math. Phys. PD NOV PY 1994 VL 35 IS 11 BP 5600 EP 5629 DI 10.1063/1.530767 PG 30 WC Physics, Mathematical SC Physics GA PP716 UT WOS:A1994PP71600005 ER PT J AU GUIDOTTI, CV SASSI, FP SASSI, R BLENCOE, JG AF GUIDOTTI, CV SASSI, FP SASSI, R BLENCOE, JG TI THE EFFECTS OF FERROMAGNESIAN COMPONENTS ON THE PARAGONITE-MUSCOVITE SOLVUS - A SEMIQUANTITATIVE ANALYSIS BASED ON CHEMICAL-DATA FOR NATURAL PARAGONITE-MUSCOVITE PAIRS SO JOURNAL OF METAMORPHIC GEOLOGY LA English DT Article DE GEOTHERMOMETRY; MUSCOVITE; PARAGONITE; PHENGITE; SOLVUS ID HIGH-PRESSURE METAMORPHISM; TAUERN WINDOW; COMPOSITIONAL CONTROLS; SOUTHWEST TURKEY; PELITIC SCHISTS; CELL DIMENSIONS; 2M1 MUSCOVITE; WESTERN ALPS; ROCKS; PETROLOGY AB Chemical data for 139 natural paragonite-muscovite (Pg-Ms) pairs illustrate the effects of ferromagnesian components on the P-T-X topology of the Pg-Ms solvus. The pairs were selected on the basis of: reasonably accurate knowledge of the P-T conditions of formation; evidence for close approach to equilibrium at peak metamorphic conditions; exclusion of pairs in which paragonite contains more than 5 mol% margarite; and exclusion of pairs from polymetamorphic rocks that contain more than one set of cogenetic Pg-Ms pairs. Graphical analysis reveals considerable scatter in the data; nevertheless, it is evident that the muscovite limb of the solvus shifts markedly toward end-member muscovite with increasing pressure from approximately 7 kbar to 21 kbar. This shift is attributed to a pressure-induced increase of the ferromagnesian content of muscovite, which increases the size of the XII alkali site - to the effect that K is more readily accommodated than Na. The data also suggest that the paragonite limb of the solvus migrates slightly toward end-member paragonite with increasing pressure. Broadening of the Pg-Ms solvus with increasing pressure reflects increasingly nonideal Na-K mixing as the phengite content of muscovite increases. Due to the wide scatter of data for Pg-phengitic-Ms pairs, it is concluded that, at the present time, Pg-Ms solvus thermometry is only viable for quasibinary Pg-Ms pairs. C1 UNIV PADUA,DIPARTIMENTO MINERAL & PETR,I-35137 PADUA,ITALY. OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. RP GUIDOTTI, CV (reprint author), UNIV MAINE,DEPT GEOL SCI,ORONO,ME 04469, USA. OI Sassi, Raffaele/0000-0001-6764-962X NR 55 TC 39 Z9 41 U1 0 U2 6 PU BLACKWELL SCIENCE INC PI CAMBRIDGE PA 238 MAIN ST, CAMBRIDGE, MA 02142 SN 0263-4929 J9 J METAMORPH GEOL JI J. Metamorph. Geol. PD NOV PY 1994 VL 12 IS 6 BP 779 EP 788 DI 10.1111/j.1525-1314.1994.tb00059.x PG 10 WC Geology SC Geology GA PL477 UT WOS:A1994PL47700006 ER PT J AU SEARS, TJ TEMPS, F WAGNER, HG WOLF, M AF SEARS, TJ TEMPS, F WAGNER, HG WOLF, M TI FAR-INFRARED LASER MAGNETIC-RESONANCE SPECTROSCOPY OF CH2CL (X2B1) SO JOURNAL OF MOLECULAR SPECTROSCOPY LA English DT Article ID LMR SPECTRA AB Far-infrared laser magnetic resonance (FIR-LMR) spectra of CH2 Cl-35 (X2 B1) observed at three FIR wavelengths in the range 450 mum less-than-or-equal-to lambda less-than-or-equal-to 750 mum have been analyzed and assigned. The spectra were obtained using three different source reactions, F + CH3Cl --> CH2Cl + HF, Cl + CH2CO --> CH2Cl + CO, and Na + CH2Cl2 --> CH2Cl + NaCl. The resonances at the three FIR wavelengths were attributed to a-dipole transitions involving relatively high rotational states (12 less-than-or-equal-to N less-than-or-equal-to 20 and 2 less-than-or-equal-to K less-than-or-equal-to 6). The spectra could be simulated satisfactorily based upon the molecular parameters derived by Endo et al. [Can. J. Phys. 62, 1347-1360 (1984)] from the millimeterwave spectrum of much lower rotational states of the radical. The agreement which was obtained shows that the CH2Cl radical possesses a rather rigid structure. (C) 1994 Academic Press, Inc. C1 MAX PLANCK INST STROMUNGSFORSCH 10,D-37073 GOTTINGEN,GERMANY. RP SEARS, TJ (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Sears, Trevor/B-5990-2013 OI Sears, Trevor/0000-0002-5559-0154 NR 14 TC 14 Z9 14 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-2852 J9 J MOL SPECTROSC JI J. Mol. Spectrosc. PD NOV PY 1994 VL 168 IS 1 BP 136 EP 146 DI 10.1006/jmsp.1994.1266 PG 11 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA PM716 UT WOS:A1994PM71600010 ER PT J AU ARNOLD, GW AF ARNOLD, GW TI ION-IMPLANTATION SILICATE GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 1st PAC RIM Meeting on Glass and Optical Materials CY NOV 07-10, 1993 CL HONOLULU, HI SP AMER CERAM SOC ID ELECTRON-IRRADIATED GLASSES; FUSED-SILICA; CRYSTALLIZATION; INDEX; OXYNITRIDE; DIFFUSION; MIGRATION; PROFILES; ELEMENTS AB This review examines the effects of ion implantation on the physical properties of silicate glasses, in particular, induced changes in optical properties, volume changes and consequent refractive index changes, and hardness alterations. In addition, the effects of chemical modification, either through direct interactions with the implanted species or through alkali depletion and crystallization, are discussed. The use of metal implants to form colloidal nanosize particles for increasing the non-linear refractive index is emphasized due to the importance for optoelectronic applications. RP ARNOLD, GW (reprint author), SANDIA NATL LABS, DEPT 1111, POB 5800, ALBUQUERQUE, NM 87185 USA. NR 64 TC 20 Z9 20 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD NOV PY 1994 VL 179 BP 288 EP 299 DI 10.1016/0022-3093(94)90707-2 PG 12 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PW797 UT WOS:A1994PW79700029 ER PT J AU BUNKER, BC AF BUNKER, BC TI MOLECULAR MECHANISMS FOR CORROSION OF SILICA AND SILICATE-GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 1st PAC RIM Meeting on Glass and Optical Materials CY NOV 07-10, 1993 CL HONOLULU, HI SP AMER CERAM SOC ID SODIUM BOROSILICATE GLASS; DEHYDROXYLATED SILICA; SURFACE; HYDROGEN; KINETICS AB Dissolution, selective leaching, and stress-corrosion cracking are all processes which can degrade the performance of silica and silicate glasses exposed to aqueous environments. Reactions which corrode glass in water include hydration, hydrolysis and condensation, and ion-exchange processes. Techniques such as solid-state nuclear magnetic resonance, Raman and Fourier transform infrared spectroscopies, pH stat titrations and elemental depth profiling have been used to establish the relative importance of the above reactions on glass degradation as a function of solution pH and composition, temperature and stress level. This paper reviews results obtained for silica, alkali silicate, and alkali boro- and aluminosilicate glasses. For most glasses, the rate at which water enters the glass structure controls the kinetics of the other glass-water reactions, explaining the corrosion characteristics of different glass compositions. RP BUNKER, BC (reprint author), PACIFIC NW LAB, POB 999,MS K2-45, RICHLAND, WA 99352 USA. NR 24 TC 234 Z9 237 U1 7 U2 97 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD NOV PY 1994 VL 179 BP 300 EP 308 DI 10.1016/0022-3093(94)90708-0 PG 9 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PW797 UT WOS:A1994PW79700030 ER PT J AU POTTER, BG SINCLAIR, MB DIMOS, D TUTTLE, BA SCHWARTZ, RW AF POTTER, BG SINCLAIR, MB DIMOS, D TUTTLE, BA SCHWARTZ, RW TI ELECTROOPTICAL AND OPTICAL EVALUATION OF PB(ZR, TI)O-3 THIN-FILMS USING WAVE-GUIDE REFRACTOMETRY SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 1st PAC RIM Meeting on Glass and Optical Materials/1st International Conference on Processing Materials for Properties (PMP 93) CY NOV 07-10, 1993 CL HONOLULU, HI SP AMER CERAM SOC, MINERALS MET & MAT SOC, MIN & MAT PROC INST JAPAN ID CRYSTALLINE AB Prism-coupled, waveguide refractometry was utilized to independently monitor electric-field-induced changes in the extraordinary and ordinary refractive indices of a Pb(Zr0.53Ti0.47)O-3 (PZT 53/47) thin film. Under an electric field, applied normal to the film plane and corresponding to saturation of the electric polarization, the ratio of the extraordinary to ordinary refractive index change, Delta n(e)/Delta n(o), is found to be -4/1, contributing to a net birefringence change, Delta(n(e) - n(o)), of - 0.021. The technique thus accesses both diagonal and off-diagonal elements of the electro-optic response tenser describing the macroscopic behavior of the polycrystalline film. In addition, the widths of the waveguide mode reflectivity minima were sensitive to variation in the microstructure of several PZT (40/60) films indicating that the refractometry technique can provide information helpful in evaluating the optical quality in these films. RP POTTER, BG (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 13 TC 16 Z9 16 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD NOV PY 1994 VL 178 BP 69 EP 76 DI 10.1016/0022-3093(94)90267-4 PG 8 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PW314 UT WOS:A1994PW31400012 ER PT J AU HESS, NJ EXARHOS, GJ AF HESS, NJ EXARHOS, GJ TI PRESSURE-TEMPERATURE SENSORS - SOLUTION DEPOSITION OF RARE-EARTH-DOPED GARNET-FILMS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 1st PAC RIM Meeting on Glass and Optical Materials/1st International Conference on Processing Materials for Properties (PMP 93) CY NOV 07-10, 1993 CL HONOLULU, HI SP AMER CERAM SOC, MINERALS MET & MAT SOC, MIN & MAT PROC INST JAPAN ID COMBUSTION SYNTHESIS; SM-YAG; FLUORESCENCE; MODEL; RUBY AB An aqueous route to the deposition of multicomponent metal oxide films is based upon the complexation of precursor metal nitrate salts by glycine, or other organic complexant, followed by spin-coating the homogeneous solution onto pre-treated silica substrates. Glycine serves to frustrate the formation of cation oxides, thus precipitation. Upon dehydration, a glassy matrix results through which metal cations and nitrate anions are homogeneously dispersed. Subsequent heating of coated substrates initiates an oxidation-reduction reaction, which removes the organic matrix and residual nitrate leaving behind a film of the desired oxide composition. Using this method, Sm:YAG (Sm: Y3Al(5)O(12)-garnet) films about 150 nm thick have been deposited. The respective phases have been confirmed by powder X-ray diffraction measurements and fluorescence spectroscopy. Analogous studies using powders generated by the same technique provided the parameters for optimizing processing conditions to generate phase pure YAG films. The fluorescence emission wavelength and related lifetime of certain electronic transitions arising from metal cation dopants vary as a function of pressure and temperature suggesting their use as optical sensors. This work suggests the possible application of these films as pressure-temperature sensors in a planar waveguide configuration or as a coating material for optical fibers. RP HESS, NJ (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. OI Hess, Nancy/0000-0002-8930-9500 NR 11 TC 9 Z9 9 U1 0 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD NOV PY 1994 VL 178 BP 91 EP 97 DI 10.1016/0022-3093(94)90270-4 PG 7 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PW314 UT WOS:A1994PW31400015 ER PT J AU ANDERSON, MT PHILLIPS, MLF STUCKY, GD AF ANDERSON, MT PHILLIPS, MLF STUCKY, GD TI INORGANIC MATERIALS FOR ANOMALOUS-DISPERSION PHASE-MATCHED 2ND-HARMONIC GENERATION - RUBIDIUM TITANYL ARSENATE ISOMORPHS, RB[TI(1-2X)LN(X)NB(X)]OASO4 SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID KTIOPO4 WAVE-GUIDES; FABRICATION; RADIATION AB The defect chemistry and optical properties of Rb[Ti(1-2x)Ln(x)Nb(x)]OAsO4 are reported. The solid solubility of lanthanide ions in these materials decreases exponentially as the size of the lanthanide ion increases. The high-temperature chemistry is complex: Rb[Ti(1-2x)Ln(x)Nb(x)]OAsO4 is formed at low dopant concentrations and Rb-1-z square(z)[Ti(1-2x-z)Ln(x)Nb(x+z)]OAsO4 and additional phases are formed at higher concentrations. All the materials exhibit absorption spectra that are characteristic of the particular lanthanide ion in the structure. The charge transfer band is red-shifted 0-27 nm relative to RbTiOAsO4 (midpoint 331 nm). The magnitude of the shift depends on the method of sample preparation. Second-harmonic intensities measured at 532 nm decrease exponentially as the lanthanide ion concentration is increased. C1 UNIV CALIF SANTA BARBARA, DEPT CHEM, SANTA BARBARA, CA 93106 USA. RP ANDERSON, MT (reprint author), SANDIA NATL LABS, DEPT CERAM SYNTHESIS & INORGAN CHEM, POB 5800, ALBUQUERQUE, NM 87185 USA. NR 23 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 EI 1873-4812 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD NOV PY 1994 VL 178 BP 120 EP 128 DI 10.1016/0022-3093(94)90275-5 PG 9 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PW314 UT WOS:A1994PW31400020 ER PT J AU CHEN, DG POTTER, BG SIMMONS, JH AF CHEN, DG POTTER, BG SIMMONS, JH TI GEO2-SIO2 THIN-FILMS FOR PLANAR WAVE-GUIDE APPLICATIONS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 1st PAC RIM Meeting on Glass and Optical Materials/1st International Conference on Processing Materials for Properties (PMP 93) CY NOV 07-10, 1993 CL HONOLULU, HI SP AMER CERAM SOC, MINERALS MET & MAT SOC, MIN & MAT PROC INST JAPAN ID OPTICAL-WAVEGUIDES; VITREOUS SILICA; WAVE-GUIDE; GLASSES; FIBER; PHOTOSENSITIVITY; SCATTERING AB Various thin films of germanium silicate glass with high germania content have been fabricated by a sol-gel method. After densification, these films have a high optical quality and can be used as planar waveguides. The densification behavior of these films was studied by measurements of the index of refraction, as a function of heat treatment temperatures, using ellipsometry. The relationship of refractive index versus GeO2 content follows the additive Lorentz-Lorenz model. Waveguiding Raman spectroscopy suggested the formation of Si-O-Ge linkages in these films without phase segregation. Various waveguide propagation characteristics, at 632.8 nm, were studied using a prism coupling technique. The propagation loss rate of a 50GeO(2)0-50SiO(2) glass waveguide was measured as 3.31 dB/cm. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. UNIV FLORIDA,DEPT MAT SCI & ENGN,GAINESVILLE,FL 32611. RP CHEN, DG (reprint author), YTC AMER INC,550 VIA ALONDRA,CAMARILLO,CA 93012, USA. NR 36 TC 41 Z9 41 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD NOV PY 1994 VL 178 BP 135 EP 147 DI 10.1016/0022-3093(94)90277-1 PG 13 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PW314 UT WOS:A1994PW31400022 ER PT J AU HOSONO, H ZUHR, RA AF HOSONO, H ZUHR, RA TI STRUCTURAL FACTOR CONTROLLING NANASIZE COPPER FORMATION IN DOPED AMORPHOUS SILICA BY ION-IMPLANTATION SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 1st PAC RIM Meeting on Glass and Optical Materials/1st International Conference on Processing Materials for Properties (PMP 93) CY NOV 07-10, 1993 CL HONOLULU, HI SP AMER CERAM SOC, MINERALS MET & MAT SOC, MIN & MAT PROC INST JAPAN ID SIO2 GLASS; PHOSPHORUS COLLOIDS; FLUORINE; ALUMINUM; SPECTRA AB Colloid formation of Cu particles by ion implantation was examined in SiO2 glass substrates doped with F, P or Ge ions. Doping of phosphorus strikingly reduced intensities of an optical band peaking at 2.2 eV, which is due to plasma oscillation of nanosized copper colloids, while no or a faint effect was seen for fluorine and germanium-doped substrates. Doping of 1.3 mol% P2O5 reduced the absorption intensities to similar to 1/4 and diameters of Cu-colloid particles to similar to 2/3 compared with those in the P-free substrate. On the other hand, F-doping up to 8 mol% gave no perceptible changes and Ge-doping of 6 mol% resulted in similar to 10% decrease in the absorption intensity. It was considered that the primary factor controlling Cu-colloid formation in the implanted glasses is not the change in the continuity of silica network structure but the change in the strength of solvation of charged states of implanted ions. A close similarity was found between the present conclusions and codoping effects on the cluster formation of rare-earth oxides in silica glasses. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP HOSONO, H (reprint author), TOKYO INST TECHNOL,ENGN MAT RES LAB,MIDORI KU,4259 NAGATSUTA,YOKOHAMA,KANAGAWA 227,JAPAN. RI Hosono, Hideo/J-3489-2013 OI Hosono, Hideo/0000-0001-9260-6728 NR 26 TC 17 Z9 17 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD NOV PY 1994 VL 178 BP 160 EP 165 DI 10.1016/0022-3093(94)90280-1 PG 6 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PW314 UT WOS:A1994PW31400025 ER PT J AU BINER, SB AF BINER, SB TI A NUMERICAL-ANALYSIS OF CRACK-PROPAGATION IN MICROCRACKING CERAMIC AND CERAMIC COMPOSITES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 1st PAC RIM Meeting on Glass and Optical Materials/1st International Conference on Processing Materials for Properties (PMP 93) CY NOV 07-10, 1993 CL HONOLULU, HI SP AMER CERAM SOC, MINERALS MET & MAT SOC, MIN & MAT PROC INST JAPAN ID FINITE-ELEMENT METHOD; BRITTLE SOLIDS; RESISTANCE; TIP; GROWTH AB In this study, a set of numerical analyses of crack growth performed to elucidate the mechanism of microcracking on the observed fracture behaviour of brittle solids and composites is described. The random nucleation, orientation and size effects of discrete microcracks and resulting interactions are fully accounted for in a hybrid finite-element model. The results indicate that the energy expenditure due to microcrack nucleation seems not to contribute significantly to the resistance to crack growth. The main controlling parameter appears to be elastic interaction of the microcracks with the main crack in the absence of a reinforcing phase; therefore, the microcrack density plays an important role. In the case of composites, the interaction of the main crack with the stress fields of the reinforcing phase, rather than interaction of microcracks, is the controlling parameter for the resistance to crack growth even in the presence of a large population of microcracks. It is also shown that crack branching and crack kinking can readily develop as a result of microcracking. RP BINER, SB (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,208 MD,AMES,IA 50011, USA. NR 25 TC 2 Z9 2 U1 2 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD NOV PY 1994 VL 177 BP 36 EP 45 DI 10.1016/0022-3093(94)90512-6 PG 10 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PV775 UT WOS:A1994PV77500005 ER PT J AU JENKINS, MG LARACURZIO, E FERBER, MK SALEM, JA AF JENKINS, MG LARACURZIO, E FERBER, MK SALEM, JA TI OBSERVATIONS OF INELASTIC DEFORMATION DURING HIGH-TEMPERATURE FATIGUE AND FAILURE OF A POLYCRYSTALLINE SILICON-NITRIDE SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 1st PAC RIM Meeting on Glass and Optical Materials/1st International Conference on Processing Materials for Properties (PMP 93) CY NOV 07-10, 1993 CL HONOLULU, HI SP AMER CERAM SOC, MINERALS MET & MAT SOC, MIN & MAT PROC INST JAPAN ID STRENGTH; BEHAVIOR AB The effects of rate-dependent inelastic deformation were observed during tensile static, dynamic, and cyclic fatigue testing of a hot-isotatically pressed, monolithic, polycrystalline silicon nitride in ambient air at temperatures of 1150, 1260 and 1370 degrees C. Constant stresses in static fatigue ranged from 50 to 300 MPa. Stress rates in dynamic fatigue ranged from 10(-4) to 101 MPa/s. Waveforms in cyclic fatigue included trapezoid, triangle and sine at a stress ratio, R, of 0.1, frequencies of 0.1 and 10 Hz, and maximum stresses ranging from 75 to 325 MPa. At 1150 degrees C, all fatigue results showed a similar slow Crack growth failure mechanism with no separate cyclic fatigue mechanism. However, at 1260 and 1370 degrees C the failure mechanism was multi-faceted. For both temperatures, the failure in static fatigue was dominated by the accumulation of diffusion-controlled creep cavities. In dynamic fatigue, the inelastic deformation exhibited by non-linear stress-strain curves supported the conclusion of failure by slow crack growth alone at high stress rates and by a mixture of slow crack growth and creep damage at low stress rates. Under cyclic loading,'enhanced' times to failure, attributed to viscous rate effects, occurred regardless of waveform or frequency. The stress rate was related to the stress at the onset to non-linearity, sigma(0), indicating a quasi-endurance limit below which cyclic fatigue had little 'enhancing' effect. Creep compliance relations indicated non-linear viscoelastic (or viscoplastic) behavior, leading to speculation on the role of this behavior in producing the 'enhanced' cyclic fatigue resistance. C1 OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. NASA, LEWIS RES CTR, CLEVELAND, OH 44135 USA. RP JENKINS, MG (reprint author), UNIV WASHINGTON, DEPT MECH ENGN, SEATTLE, WA 98195 USA. NR 26 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD NOV PY 1994 VL 177 BP 54 EP 66 DI 10.1016/0022-3093(94)90514-2 PG 13 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PV775 UT WOS:A1994PV77500007 ER PT J AU REIMANIS, IE PETROVIC, JJ MITCHELL, TE AF REIMANIS, IE PETROVIC, JJ MITCHELL, TE TI THE FRACTURE-BEHAVIOR OF SINGLE-CRYSTAL Y3AL5O12 SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 1st PAC RIM Meeting on Glass and Optical Materials/1st International Conference on Processing Materials for Properties (PMP 93) CY NOV 07-10, 1993 CL HONOLULU, HI SP AMER CERAM SOC, MINERALS MET & MAT SOC, MIN & MAT PROC INST JAPAN ID TOUGHNESS AB The fracture behavior of single-crystal yttrium aluminum garnet in ambient air has been studied as a function of temperature for two different crystallographic orientations. A Chevron notch specimen geometry was used so that stable crack propagation could be achieved. It was found that the room temperature fracture toughness, K-Ic = 1.8 MPa m(1/2), increased to K-Ic = 4.0 MPa m(1/2) at 1600 degrees C. At 1750 degrees C, samples did not fracture even when the load was brought to an equivalent stress intensity factor of 11.3 MPA m(1/2). The fracture toughness was found not to depend significantly on crystallographic orientation. The increase in toughness with temperature was attributed to the activation of slip systems, which were evaluated by trace analysis. It was found that the degree of plasticity is extremely sensitive to the strain rate. Finally, periodic striations were observed on the fracture surfaces which are believed to be related to periodic chemical or structural fluctuations which arise during the Czochralski growth process. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 14 TC 7 Z9 7 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD NOV PY 1994 VL 177 BP 67 EP 73 DI 10.1016/0022-3093(94)90515-0 PG 7 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PV775 UT WOS:A1994PV77500008 ER PT J AU REIDMEYER, MR DAY, DE BROW, RK AF REIDMEYER, MR DAY, DE BROW, RK TI PHOSPHORUS OXYNITRIDE GLASSES OF VARIABLE SODIUM CONTENT SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 1st PAC RIM Meeting on Glass and Optical Materials/1st International Conference on Processing Materials for Properties (PMP 93) CY NOV 07-10, 1993 CL HONOLULU, HI SP AMER CERAM SOC, MINERALS MET & MAT SOC, MIN & MAT PROC INST JAPAN ID LITHIUM-METAPHOSPHATE GLASSES; NITROGEN DISSOLUTION; PHOSPHATE-GLASSES AB Nitriding phosphate glasses of variable sodium content, xNa(2)O.(1-x)P2O5, in anhydrous ammonia gas is described. The thermal expansion coefficient and dissolution rate in water decrease with increasing P2O5 and nitrogen content. The dilatometric softening point and glass transition temperature decrease with increasing P2O5 and increase with increasing nitrogen content. The water content of the as-melted glasses increases dramatically with increasing P2O5 content. The N 1s and O 1s spectra were determined with X-ray photoelectron spectroscopy. C1 UNIV MISSOURI,GRAD CTR MAT RES,ROLLA,MO 65401. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 17 TC 11 Z9 11 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD NOV PY 1994 VL 177 BP 208 EP 215 DI 10.1016/0022-3093(94)90532-0 PG 8 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PV775 UT WOS:A1994PV77500025 ER PT J AU BROW, RK TALLANT, DR HUDGENS, JJ MARTIN, SW IRWIN, AD AF BROW, RK TALLANT, DR HUDGENS, JJ MARTIN, SW IRWIN, AD TI THE SHORT-RANGE STRUCTURE OF SODIUM ULTRAPHOSPHATE GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 1st PAC RIM Meeting on Glass and Optical Materials/1st International Conference on Processing Materials for Properties (PMP 93) CY NOV 07-10, 1993 CL HONOLULU, HI SP AMER CERAM SOC, MINERALS MET & MAT SOC, MIN & MAT PROC INST JAPAN ID PHOSPHATE-GLASSES; SPECTRA; RAMAN; P-31; TRANSITION; ALKALI; B2O3 AB Anhydrous sodium ultraphosphate glasses were prepared with Na,O contents between O and 50 mol% and were characterized by several structurally sensitive spectroscopic probes to determine the nature of the phosphate tetrahedra that constitute the short-range glass structure. Solid state P-31 magic angle spinning nuclear magnetic resonance (MAS-NMR) spectroscopy reveals that Na2O depolymerizes the branched (Q(3)) P-O network of P2O5 to form metaphosphate (Q(2)) sites, in quantitative agreement with Van Water's 'chemically simple' model. X-ray photoelectron spectroscopy reveals that the concomitant increase in non-bridging oxygen with increasing Na2O content is also in quantitative agreement with this structural model. Raman spectroscopic analyses of glasses with approximately 40 mol% Na2O suggest that some intermediate-range order, perhaps associated with strained rings, also exists within the glass network. Strained sites are eliminated when the solid glass is heated to melt temperatures. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. BUTLER UNIV,DEPT CHEM,INDIANAPOLIS,IN 46208. RP BROW, RK (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 22 TC 106 Z9 106 U1 5 U2 20 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD NOV PY 1994 VL 177 BP 221 EP 228 DI 10.1016/0022-3093(94)90534-7 PG 8 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PV775 UT WOS:A1994PV77500027 ER PT J AU PRICE, DL ELLISON, AJG AF PRICE, DL ELLISON, AJG TI ATOMIC-STRUCTURE AND DYNAMICS OF FAST-ION CONDUCTING GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 1st PAC RIM Meeting on Glass and Optical Materials/1st International Conference on Processing Materials for Properties (PMP 93) CY NOV 07-10, 1993 CL HONOLULU, HI SP AMER CERAM SOC, MINERALS MET & MAT SOC, MIN & MAT PROC INST JAPAN ID AG-GE-SE; SHORT-RANGE ORDER; CHALCOGENIDE GLASSES; SPECTROSCOPIES; SYSTEM; SI-29 AB Results of neutron diffraction, inelastic neutron scattering and Raman scattering measurements are presented for Li2SiS3 and compared with similar data for another fast-ion conducting glass, Ag4Ge3Se9. The structures are different in some respects, with the Li+ ions in fourfold-coordinated sites in Li2SiS3 compared with Ag+ ions occupying threefold-coordinated Sites in Ag4Ge3Se9. However, the effect of the fast-ion modifying component appears to be similar in the two systems, leading to a decrease in the number of edge-shared tetrahedra and breaking the connectivity of the network, thus facilitating the high mobility RP PRICE, DL (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Price, David Long/A-8468-2013 NR 16 TC 11 Z9 11 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD NOV PY 1994 VL 177 BP 293 EP 298 DI 10.1016/0022-3093(94)90543-6 PG 6 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PV775 UT WOS:A1994PV77500036 ER PT J AU MAGRUDER, RH OSBORNE, DH ZUHR, RA AF MAGRUDER, RH OSBORNE, DH ZUHR, RA TI NONLINEAR-OPTICAL PROPERTIES OF NANOMETER DIMENSION AG-CU PARTICLES IN SILICA FORMED BY SEQUENTIAL ION-IMPLANTATION SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Letter ID NONLINEARITIES; RESONANCE AB Nanometer dimension metal colloids were formed in silica by sequential implantation of Ag and Cu ions. The Ag and Cu were implanted with Ag to Cu ratios of 9:3, 6:6 and 3:9 and total nominal dose 12 X 10(16) ions/cm(2). The linear optical response was measured from 200 to 900 nm. The non-linear optical properties were measured using the Z-scan technique at a wavelength of 570 nm. The linear and non-linear optical properties were found to be dependent upon the Ag to Cu ratio. C1 VANDERBILT UNIV,DEPT PHYS,NASHVILLE,TN 37235. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP MAGRUDER, RH (reprint author), VANDERBILT UNIV,DEPT APPL ENGN & SCI,NASHVILLE,TN 37235, USA. NR 14 TC 67 Z9 68 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD NOV PY 1994 VL 176 IS 2-3 BP 299 EP 303 DI 10.1016/0022-3093(94)90091-4 PG 5 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA PU029 UT WOS:A1994PU02900025 ER PT J AU CHEN, Y CLINARD, FW EVANS, BD FARNUM, EH FRENCH, RH GONZALEZ, R ODWYER, JJ WIFFEN, FW ZONG, XF AF CHEN, Y CLINARD, FW EVANS, BD FARNUM, EH FRENCH, RH GONZALEZ, R ODWYER, JJ WIFFEN, FW ZONG, XF TI ELECTRICAL BREAKDOWN OF INSULATING CERAMICS IN A HIGH-RADIATION FIELD SO JOURNAL OF NUCLEAR MATERIALS LA English DT Review ID MGO SINGLE-CRYSTALS; INDUCED CONDUCTIVITY; DIELECTRIC-BREAKDOWN; HIGH-TEMPERATURES; ELECTRONIC EXCITATION; REACTOR MEASUREMENT; FISSION REACTOR; BAND-STRUCTURE; ALPHA-ALUMINA; DOPED MGO AB This report addresses a recently reported phenomenon - that a simultaneous application of energetic particle radiation, electric field, and elevated temperature for an extended period of time has a permanent adverse effect on insulating ceramics, including electrical breakdown. This behavior poses a serious challenge for fusion devices, which require electrical insulators in several key components. The summary and recommendations developed here are based largely on the proceedings of a research assistance task force meeting entitled ''Electrical Breakdown of Ceramics in a High-Radiation Field''. Since this is a rapidly expanding field, this report attempts to include highlights of pertinent studies reported at recent international meetings. In one recent meeting the fusion materials community recommended that this effect be referred to as radiation-induced electrical degradation (RIED). C1 OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. BOEING DEF & SPACE GRP, SEATTLE, WA 98124 USA. DUPONT CO INC, CENT RES & DEV, WILMINGTON, DE 19880 USA. UNIV CARLOS 3, ESCUELA POLITECN SUPER, DEPT INGN, E-28913 LEGANES, SPAIN. SUNY COLL OSWEGO, DEPT PHYS, OSWEGO, NY 13126 USA. US DOE, OFF FUS ENERGY, WASHINGTON, DC 20585 USA. FUDAN UNIV, DEPT MAT SCI & ENGN, SHANGHAI 200433, PEOPLES R CHINA. RP US DOE, OFF BASIC ENERGY SCI, ER 131, WASHINGTON, DC 20585 USA. RI French, Roger/E-1986-2011 OI French, Roger/0000-0002-6162-0532 NR 88 TC 10 Z9 10 U1 0 U2 12 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 EI 1873-4820 J9 J NUCL MATER JI J. Nucl. Mater. PD NOV PY 1994 VL 217 IS 1-2 BP 32 EP 47 DI 10.1016/0022-3115(94)90302-6 PG 16 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA PR422 UT WOS:A1994PR42200002 ER PT J AU STRACHAN, JD MANSFIELD, DK BELL, MG COLLINS, J ERNST, D HILL, K HOSEA, J TIMBERLAKE, J ULRICKSON, M TERRY, J MARMAR, E SNIPES, J AF STRACHAN, JD MANSFIELD, DK BELL, MG COLLINS, J ERNST, D HILL, K HOSEA, J TIMBERLAKE, J ULRICKSON, M TERRY, J MARMAR, E SNIPES, J TI WALL CONDITIONING EXPERIMENTS ON TFTR USING IMPURITY PELLET INJECTION SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID PLASMAS AB This work describes experiments intended to optimize the limiter conditioning for TFTR supershots. It is shown that deposition of thin layers of lithium on the limiters by impurity pellet injection changes the plasma-wall interaction and improves supershot performance. Series of up to ten Ohmic plasmas each with two lithium pellets were useful in pre-conditioning the limiter. Generally, plasma performance increased with the amount of lithium deposited up to the maximal amount which could be deposited. Experiments were performed with different materials being deposited (carbon, boron and lithium) and with different methods of deposition. C1 MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139. RP STRACHAN, JD (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. RI Ernst, Darin/A-1487-2010 OI Ernst, Darin/0000-0002-9577-2809 NR 13 TC 20 Z9 20 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD NOV PY 1994 VL 217 IS 1-2 BP 145 EP 153 DI 10.1016/0022-3115(94)90314-X PG 9 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA PR422 UT WOS:A1994PR42200014 ER PT J AU SINGH, BN ZINKLE, SJ AF SINGH, BN ZINKLE, SJ TI INFLUENCE OF IRRADIATION PARAMETERS ON DAMAGE ACCUMULATION IN METALS AND ALLOYS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID MEV PROTON IRRADIATION; VOID FORMATION; MICROSTRUCTURAL EVOLUTION; CAVITY FORMATION; PRODUCTION BIAS; COPPER-ALLOYS; DOSE-RATE; HELIUM; CASCADES; TEMPERATURE AB It is well known that a fraction of defects produced during irradiation accumulate in crystalline solids in the form of clusters of self-interstitial atoms (SIAs) and vacancies, loops, tetrahedra, dislocation segments and cavities. The irradiation parameters such as recoil energy, damage rate, helium production rate and the production rate of transmutant impurities may affect the rate and the magnitude of the damage accumulation. Possible mechanisms by which these parameters may affect the damage accumulation are described. Specific examples are given to illustrate the fact that the recoil energy plays a significant role in determining the magnitude of the damage accumulation. Unfortunately, the available experimental results are not sufficient to allow an unambiguous identification of the mechanisms involved in the evolution of the damage accumulation. Some suggestions are made for carrying out simple, clean and specifically designed experiments to identify the role of irradiation parameters in defect production and accumulation. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP SINGH, BN (reprint author), RISO NATL LAB,DEPT MAT,POB 49,DK-4000 ROSKILDE,DENMARK. OI Zinkle, Steven/0000-0003-2890-6915 NR 64 TC 15 Z9 15 U1 0 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD NOV PY 1994 VL 217 IS 1-2 BP 161 EP 171 DI 10.1016/0022-3115(94)90316-6 PG 11 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA PR422 UT WOS:A1994PR42200016 ER PT J AU LIN, HT BRASKI, DN AF LIN, HT BRASKI, DN TI DEGRADATION IN THE WELDABILITY OF A HELIUM-CONTAINING VANADIUM ALLOY SO JOURNAL OF NUCLEAR MATERIALS LA English DT Letter RP OAK RIDGE NATL LAB, DIV MET & CERAM, OAK RIDGE, TN 37830 USA. NR 10 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 EI 1873-4820 J9 J NUCL MATER JI J. Nucl. Mater. PD NOV PY 1994 VL 217 IS 1-2 BP 209 EP 212 DI 10.1016/0022-3115(94)90324-7 PG 4 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA PR422 UT WOS:A1994PR42200024 ER PT J AU ALEXANDER, DE REHN, LE AF ALEXANDER, DE REHN, LE TI GAMMA-RAY DISPLACEMENT DAMAGE IN THE PRESSURE-VESSEL OF THE ADVANCED BOILING WATER-REACTOR SO JOURNAL OF NUCLEAR MATERIALS LA English DT Letter RP ALEXANDER, DE (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 14 TC 21 Z9 21 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD NOV PY 1994 VL 217 IS 1-2 BP 213 EP 216 DI 10.1016/0022-3115(94)90325-5 PG 4 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA PR422 UT WOS:A1994PR42200025 ER PT J AU PANDEY, R JAFFE, JE HARRISON, NM AF PANDEY, R JAFFE, JE HARRISON, NM TI AB-INITIO STUDY OF HIGH-PRESSURE PHASE-TRANSITION IN GAN SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE SEMICONDUCTOR; AB INITIO CALCULATOR; HIGH PRESSURE; PHASE TRANSITION ID GALLIUM NITRIDE; HARTREE-FOCK; TOTAL-ENERGY; GROWTH; ZNO AB The total energy of GaN as a function of unit cell volume has been calculated for the wurtzite, zinc-blende, and rocksalt phases by the ab initio all-electron periodic Hartree-Fock method. The gallium 3d levels were treated as fully relaxed band states, and the internal coordinates c/a and u in the wurtzite phase were optimized. The calculated transition pressure between the wurtzite rocksalt phases comes out to be about 52 GPa at the Hartree-Fock level and about 35 GPa at the correlated level. The calculated electronic structure shows strong hybridization of Ga 3d and N 2s states with the ordering as Ga 3d < N 2s < N 2p in all the phases. The band gap is direct at Gamma in the wurtzite and zinc-blende phases and is indirect in the high pressure rocksalt phase where the valence band maximum is shifted away from the Gamma point. C1 PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. SERC, DARESBURY LAB, WARRINGTON WA4 4AD, CHESHIRE, ENGLAND. RP PANDEY, R (reprint author), MICHIGAN TECHNOL UNIV, DEPT PHYS, HOUGHTON, MI 49931 USA. RI Harrison, Nicholas/H-3198-2013 OI Harrison, Nicholas/0000-0001-7498-8144 NR 25 TC 60 Z9 60 U1 2 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD NOV PY 1994 VL 55 IS 11 BP 1357 EP 1361 DI 10.1016/0022-3697(94)90221-6 PG 5 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA QB349 UT WOS:A1994QB34900026 ER PT J AU MOLLER, P NIX, JR AF MOLLER, P NIX, JR TI STABILITY OF HEAVY AND SUPERHEAVY ELEMENTS SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Review ID NUCLEAR-MASS FORMULA; FISSION HALF-LIVES; BETA-STRENGTH FUNCTIONS; THOMAS-FERMI APPROACH; POTENTIAL-ENERGY; HEAVIEST NUCLEI; SYMMETRIC FISSION; DROPLET MODEL; BARRIERS; FRAGMENTATION AB We review several important experimental and theoretical developments that during the past decade have revived interest in the stability properties of the heaviest elements. On the experimental side two accomplishments stand out. One is the extension of the known elements to 107Ns, 108Hs and 109Mt. The other is the collection of an extensive body of data on the transition between asymmetric and symmetric fission in the region close to proton number Z = 2 x 50 and neutron number N = 2 x 82. On the theoretical side it has become clear that some models that appropriately account for the most important nuclear-structure aspects are sufficiently reliable for meaningful applications to new regions of nuclei and to studies of new phenomena. We discuss here in particular the importance of a 'few-parameter approach' and of solving a Schroedinger equation for accurately obtaining microscopic effects. We show how such models now more reliably than earlier describe the stability properties of the heaviest elements when the following importnat points are treated carefully. In fission studies very precise shape specifications are necessary in the saddle-point region and beyond. Coulomb redistribution effects and higher-multipole effects are important for determining the ground-state masses. We review how consideration of these effects has influenced theoretical work in the last decade and present some current results on alpha-decay, beta-decay and fission properties in the heaviest region. C1 UNIV AIZU,CTR MATH SCI,FUKUSHIMA 96580,JAPAN. RP MOLLER, P (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 131 TC 225 Z9 232 U1 0 U2 6 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD NOV PY 1994 VL 20 IS 11 BP 1681 EP 1747 DI 10.1088/0954-3899/20/11/003 PG 67 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA PT061 UT WOS:A1994PT06100003 ER PT J AU CHEN, SS ZHU, S JENDRZEJCZYK, JA AF CHEN, SS ZHU, S JENDRZEJCZYK, JA TI FLUID DAMPING AND FLUID STIFFNESS OF A TUBE ROW IN CROSS-FLOW SO JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article ID ARRAYS; FLOW AB Motion-dependent fluid forces acting on a tube array were measured as a function of excitation frequency, excitation amplitude, and flow velocity. Fluid-damping and fluid-stiffness coefficients were obtained from measured motion-dependent fluid forces as a function of reduced flow velocity and excitation amplitude. The water channel and test setup provide a sound facility for obtaining key coefficients for fluidelastic instability of tube arrays in crossflow. Once the motion-dependent fluid-force coefficients have been measured, a reliable design guideline, based on the unsteady flow theory, can be developed for fluidelastic instability of tube arrays in crossflow. RP CHEN, SS (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 35 TC 18 Z9 18 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0094-9930 J9 J PRESS VESS-T ASME JI J. Press. Vessel Technol.-Trans. ASME PD NOV PY 1994 VL 116 IS 4 BP 370 EP 383 DI 10.1115/1.2929604 PG 14 WC Engineering, Mechanical SC Engineering GA PW145 UT WOS:A1994PW14500006 ER PT J AU PUDJIJANTO, S DENN, MM AF PUDJIJANTO, S DENN, MM TI A STABLE ISLAND IN THE SLIP-STICK REGION OF LINEAR LOW-DENSITY POLYETHYLENE SO JOURNAL OF RHEOLOGY LA English DT Article ID WALL SLIP; TEMPERATURE WINDOW; FLOW RESISTANCE; CAPILLARY; FRACTURE; LLDPE; HDPE C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV SCI MAT,BERKELEY,CA 94720. RP PUDJIJANTO, S (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 13 TC 31 Z9 35 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0148-6055 J9 J RHEOL JI J. Rheol. PD NOV-DEC PY 1994 VL 38 IS 6 BP 1735 EP 1744 DI 10.1122/1.550523 PG 10 WC Mechanics SC Mechanics GA PR721 UT WOS:A1994PR72100007 ER PT J AU INGBER, MS MONDY, LA AF INGBER, MS MONDY, LA TI A NUMERICAL STUDY OF 3-DIMENSIONAL JEFFERY ORBITS IN SHEAR-FLOW SO JOURNAL OF RHEOLOGY LA English DT Article ID BOUNDARY ELEMENT METHOD; FIBER ORIENTATION; STOKES-FLOW; HYDRODYNAMIC INTERACTION; ARBITRARY SHAPE; SUSPENSIONS; PARTICLE; MOTION; PREDICTION; SIMULATION C1 SANDIA NATL LABS,DEPT ENERGET MAT & FLUID MECH,ALBUQUERQUE,NM 87185. RP INGBER, MS (reprint author), UNIV NEW MEXICO,DEPT MECH ENGN,ALBUQUERQUE,NM 87131, USA. NR 37 TC 14 Z9 14 U1 2 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0148-6055 J9 J RHEOL JI J. Rheol. PD NOV-DEC PY 1994 VL 38 IS 6 BP 1829 EP 1843 DI 10.1122/1.550604 PG 15 WC Mechanics SC Mechanics GA PR721 UT WOS:A1994PR72100012 ER PT J AU HARRISON, WTA NENOFF, TM GIER, TE STUCKY, GD AF HARRISON, WTA NENOFF, TM GIER, TE STUCKY, GD TI PREPARATION AND CRYSTAL-STRUCTURE OF NA2ZN(HPO4)2.4H2O, A NEW LAYERED SODIUM ZINC PHOSPHATE-CONTAINING BIFURCATED TETRAHEDRAL 12-RINGS SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article ID LOW-TEMPERATURE SYNTHESIS; MOLECULAR-SIEVES; 3-RING GROUPINGS; ZINCOPHOSPHATE; FRAMEWORKS; PARAMETERS AB We report the low-temperature (approximately 0-degree-C) synthesis and X-ray single-crystal structure of Na2Zn(HPO4).4H2O, a new layered material, whose structure is built up from sheets of vertex-sharing ZnO4 and HPO4 tetrahedra, which encapsulate octahedrally coordinated ''guest'' sodium cations and water molecules. The Zn/P tetrahedral-atom connectivity in Na2Zn(HPO4)2.4H2O results in a two-dimensional network of layers of ''bifurcated,'' tetrahedral 12-rings, with interlayer connectivity established only by sodium cations and via H bonds. X-ray powder data and P-31 MAS NMR spectra are consistent with those expected from the crystal structure data. Crystal data are Na2Zn(HPO4)2.4H2O (ZnNa2P2O12H10), M(r) = 375.37, monoclinic, space group P2(1)/c(No. 14), a = 8.947(2) angstrom, b = 13.254(2) angstrom, c = 10.098(2) angstrom, beta = 116.358(6)-degrees, V = 1074.5 angstrom-3, Z = 4, R = 4.25%, and R(w) = 5.68% [1608 unique reflections with I > 3 sigma(I)]. (C) 1994 Academic Press, Inc. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87145. UNIV CALIF SANTA BARBARA,DEPT CHEM,SANTA BARBARA,CA 93106. RP HARRISON, WTA (reprint author), UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204, USA. NR 23 TC 27 Z9 27 U1 0 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD NOV PY 1994 VL 113 IS 1 BP 168 EP 175 DI 10.1006/jssc.1994.1356 PG 8 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA PP022 UT WOS:A1994PP02200024 ER PT J AU WOLFENDEN, A GILL, JE CHAWLA, KK VAIDYA, RU VENKATESH, R AF WOLFENDEN, A GILL, JE CHAWLA, KK VAIDYA, RU VENKATESH, R TI TEMPERATURE-DEPENDENCE OF DYNAMIC YOUNGS MODULUS AND MECHANICAL DAMPING IN A NEXTEL FIBER-REINFORCED GLASS COMPOSITE SO JOURNAL OF TESTING AND EVALUATION LA English DT Article DE CERAMICS; GLASS; FIBERS; COMPOSITES; YOUNGS MODULUS; DAMPING; INTERNAL FRICTION; TEMPERATURE; PIEZOELECTRIC; ULTRASONIC; DYNAMIC; NEXTEL 480 AB The piezoelectric ultrasonic composite oscillator technique (PUCOT) was used to measure the temperature dependence of dynamic Young's modulus and damping for a ceramic matrix composite (CMC) consisting of N51A glass as the matrix and Nextel 480 continuous fibers (volume fraction 0.29) as the reinforcement. The temperature range covered was 20 to 462 degrees C. It was found that the Young's modulus decreased linearly with temperature, at a relatively low rate, and that the damping followed the form exp(-H/kT), where the value of the effective activation energy H was 0.07 +/- 0.02 eV/atom, k is Boltzmann's constant, and Tis temperature in Kelvin. Possible interpretations for this value of H are discussed. The glass transition temperature of the glass was found to be about 500 degrees C. C1 NEW MEXICO INST MIN & TECHNOL,DEPT MAT & MET ENGN,SOCORRO,NM 87801. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP WOLFENDEN, A (reprint author), TEXAS A&M UNIV,DEPT MECH ENGN,ADV MAT LAB,COLLEGE STN,TX 77843, USA. NR 17 TC 2 Z9 2 U1 0 U2 1 PU AMER SOC TESTING MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DR, W CONSHOHOCKEN, PA 19428-2959 SN 0090-3973 J9 J TEST EVAL JI J. Test. Eval. PD NOV PY 1994 VL 22 IS 6 BP 571 EP 573 PG 3 WC Materials Science, Characterization & Testing SC Materials Science GA PQ501 UT WOS:A1994PQ50100011 ER PT J AU GALLOIS, BM BESMANN, TM STOTT, MW AF GALLOIS, BM BESMANN, TM STOTT, MW TI CHEMICAL ETCHING OF SILICON-(100) BY HYDROGEN SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID SURFACE AB The reactive etching of silicon (100) by hydrogen was studied in the temperature range 1325-1600 K. Rectangular etch pits formed from inverted pyramids were predominant, although more complex shapes revealing (111) planes were noted. The observed etch rates were found to lie near the thermodynamic limit, if one accepts the most positive reported enthalpy of formation of silylene. An activation energy of 314 +/- 42 kJ/mol for the etching reaction was determined from the rates at 1325-1550 K. At temperatures >1550 K, the etch rated decreased with increasing temperature, indicating a possible transfer of material from the silicon carbide-coated reaction chamber. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 18 TC 12 Z9 12 U1 0 U2 3 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD NOV PY 1994 VL 77 IS 11 BP 2949 EP 2952 DI 10.1111/j.1151-2916.1994.tb04529.x PG 4 WC Materials Science, Ceramics SC Materials Science GA PQ992 UT WOS:A1994PQ99200023 ER PT J AU DIMOS, D SCHWARTZ, RW LOCKWOOD, SJ AF DIMOS, D SCHWARTZ, RW LOCKWOOD, SJ TI CONTROL OF LEAKAGE RESISTANCE IN PB(ZR,TI)O-3 THIN-FILMS BY DONOR DOPING SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID LEAD-ZIRCONATE-TITANATE; CERAMICS; MEMORIES AB Donor doping, with La and Nb, has been used successfully to improve the leakage resistance of Pb(Zr,Ti)O-3 (PZT) films. Donor doping of Pb(Zr0.5Ti0.5)O-3 films has led to an improvement in the leakage resistance of over 2 1/2 orders of magnitude at elevated temperatures (T greater than or equal to 100 degrees C). The effect on leakage resistance is the same for the A-site (La) and B-site (Nb) dopants. However, the improvement is only about 1 order of magnitude near room temperature. This temperature effect is due to an increase in the transition temperature from a low activation energy mechanism to a higher activation energy mechanism. Similar improvements in leakage resistance have also been obtained by increasing the Pb concentration in the starting solution, which implies that Pb vacancies are the dominant acceptor species in the undoped films. In addition, donor doping has been effective in improving the electrical breakdown strength at elevated temperatures. Consequently, donor-doped PZT films have been shown to be superior to undoped films for applications requiring high leakage resistance, such as decoupling capacitors. C1 ADV MAT LAB,ALBUQUERQUE,NM 87106. RP DIMOS, D (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 30 TC 50 Z9 50 U1 1 U2 10 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD NOV PY 1994 VL 77 IS 11 BP 3000 EP 3005 DI 10.1111/j.1151-2916.1994.tb04536.x PG 6 WC Materials Science, Ceramics SC Materials Science GA PQ992 UT WOS:A1994PQ99200030 ER PT J AU LOO, JA HU, PF SMITH, RD AF LOO, JA HU, PF SMITH, RD TI INTERACTION OF ANGIOTENSIN PEPTIDES AND ZINC METAL-IONS PROBED BY ELECTROSPRAY-IONIZATION MASS-SPECTROMETRY SO JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY LA English DT Article ID ABSORPTION FINE-STRUCTURE; GAS-PHASE; ACTIVATED DISSOCIATION; ANIONIC PEPTIDES; COMPLEXES; PROTEINS; BINDING; LIGANDS; FRAGMENTATIONS; POLYPEPTIDES AB Electrospray ionization-tandem mass spectrometry experiments were used to provide evidence regarding the sites of interactions between zinc metal ions and angiotensin peptides. The electrospray ionization mass spectra of histidine-containing human angiotensin II (Asp-Arg-Val-Tyr-Ile-His-Pro-Phe) and angiotensin I (Asp-Arg-Val-Tyr-Ile-His-Pro-Phe-His-Leu) in the presence of zinc show abundant multiply charged ions for the zinc-attached peptide [M + aZn(2+) +(c - 2aH+](c+), where a = 1, 2 and c is charge. From collisionally activated dissociation experiments, with both low energy (triple quadrupole mass spectrometry) and high energy collisions (linked scan at constant B/E with a double focusing instrument) of the [M + Zn](2+) and [M + Zn + H](3+) ions for angiotensin II, a [b(6) + Zn](2+) species is produced as the most abundant product ion, suggesting that the zinc interaction site is in the vicinity of the His(6) residue. Additionally, tandem mass spectra from the zinc-attached ions for angiotensin I show abundant [b(6) + Zn](2+) and [b(9) + Zn](2+) products, providing evidence that both His(6) and His(9) are involved in zinc coordination. C1 PACIFIC NW LAB, DEPT CHEM SCI, RICHLAND, WA USA. RP LOO, JA (reprint author), WARNER LAMBERT PARKE DAVIS, PARKE DAVIS PHARMACEUT RES, 2800 PLYMOUTH RD, ANN ARBOR, MI 48105 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 45 TC 82 Z9 82 U1 1 U2 21 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 1044-0305 J9 J AM SOC MASS SPECTR JI J. Am. Soc. Mass Spectrom. PD NOV PY 1994 VL 5 IS 11 BP 959 EP 965 DI 10.1016/1044-0305(94)80014-6 PG 7 WC Chemistry, Analytical; Chemistry, Physical; Spectroscopy SC Chemistry; Spectroscopy GA PP713 UT WOS:A1994PP71300002 PM 24226385 ER PT J AU CHEN, YF EVANS, JW AF CHEN, YF EVANS, JW TI 3-DIMENSIONAL THERMAL MODELING OF LITHIUM-POLYMER BATTERIES UNDER GALVANOSTATIC DISCHARGE AND DYNAMIC POWER PROFILE SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID ELECTROLYTE BATTERIES; LI/SOCL2 CELLS AB A three-dimensional model is developed to simulate and compare heat generation and transport within a lithium polymer electrolyte battery under galvanostatic discharges and a dynamic power profile [the Simplified Federal Urban Driving Schedule (SFUDS)]. Emphasis is placed on the maintenance of the operational temperature and temperature uniformity within a battery by designing a suitable thermal management system. The results indicate that the anisotropic thermal conductivity within the battery is an important factor influencing thermal performance and should be taken into consideration in battery design. On the one hand, because of the low effective thermal conductivity across a laminated cell stack, steep temperature distributions may be caused if cooling channels or electric heaters are placed at the two ends of a cell stack. On the other hand, the relatively large average thermal conductivity along the width and height directions allows more efficient heat removal or addition, and thus facilitates the maintenance of uniform operating temperature. Under the SFUDS power profile, the time-averaged heat generation rate is low, and therefore a high-performance insulation material is required to maintain the operating temperature. The thermal model has been applied to study the effectiveness of different arrangements of cooling channels and electric heaters and to select suitable heating intensities and insulating materials. RP CHEN, YF (reprint author), LAWRENCE BERKELEY LAB,DEPT MAT SCI & MINERAL ENGN,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 39 TC 86 Z9 94 U1 2 U2 22 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD NOV PY 1994 VL 141 IS 11 BP 2947 EP 2955 DI 10.1149/1.2059263 PG 9 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA PQ524 UT WOS:A1994PQ52400009 ER PT J AU FERG, E GUMMOW, RJ DEKOCK, A THACKERAY, MM AF FERG, E GUMMOW, RJ DEKOCK, A THACKERAY, MM TI SPINEL ANODES FOR LITHIUM-ION BATTERIES SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Letter ID NEUTRON-DIFFRACTION; ELECTROCHEMISTRY; EXTRACTION; ELECTRODES; INSERTION; LIMN2O4; SPINELS; SYSTEM; OXIDES AB Anodes of Li4Mn5O12, Li4Ti5O12, and Li2Mn4O9 with a spinel-type structure have been evaluated in room-temperature lithium cells. The cathodes that were selected for this study were the stabilized spinels, Li1.03Mn1.97O4 and LiZn0.025Mn1.95O4, and layered LiCoO2. The electrochemical data demonstrated that Li+ ions will shuttle between two transition-metal host structures (anode and cathode) at a reasonably high voltage with a concomitant change in the oxidation state of the transition metal cations so that the Li+ ions do not reduce to the metallic state at the anode during charge. These cells reduce the safety hazards associated with cells containing metallic-lithium, lithium-alloy, and lithium-carbon anodes. C1 ARGONNE NATL LAB, DIV CHEM TECHNOL, ELECTROCHEM TECHNOL PROGRAM, ARGONNE, IL 60439 USA. RP FERG, E (reprint author), CSIR, DIV MAT SCI & TECHNOL, PRETORIA 0001, SOUTH AFRICA. RI Gummow, Rosalind /A-1001-2010 NR 21 TC 412 Z9 420 U1 23 U2 251 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD NOV PY 1994 VL 141 IS 11 BP L147 EP L150 DI 10.1149/1.2059324 PG 4 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA PQ524 UT WOS:A1994PQ52400003 ER PT J AU DELONG, KW TREBINO, R HUNTER, J WHITE, WE AF DELONG, KW TREBINO, R HUNTER, J WHITE, WE TI FREQUENCY-RESOLVED OPTICAL GATING WITH THE USE OF 2ND-HARMONIC GENERATION SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID ULTRASHORT PULSE; PHASE RETRIEVAL; LIGHT-PULSES; AMPLITUDE; INTENSITY AB We discuss the use of second-harmonic generation (SHG) as the nonlinearity in the technique of frequency-resolved optical gating (FROG) for measuring the full intensity and phase evolution of an arbitrary ultrashort pulse. FROG that uses a third-order nonlinearity in the polarization-gate geometry has proved extremely successful, and the algorithm required for extraction of the intensity and the phase from the experimental data is quite robust. However, for pulse intensities less than approximately 1 MW, third-order nonlinearities generate insufficient signal strength, and therefore SHG FROG appears necessary. We discuss the theoretical, algorithmic, and experimental considerations of SHG FROG in detail. SHG FROG has an ambiguity in the direction of time, and its traces are somewhat unintuitive. Also, previously published algorithms are generally ineffective at extracting the intensity and the phase of an arbitrary laser pulse from the SHG FROG trace. We present an improved pulse-retrieval algorithm, based on the method of generalized projections, that is far superior to the previously published algorithms, although it is still not so robust as the polarization-gate algorithm. We discuss experimental sources of error such as pump depletion and group-velocity mismatch. We also present several experimental examples of pulses measured with SHG FROG and show that the derived intensities and phases are in agreement with more conventional diagnostic techniques, and we demonstrate the high-dynamic-range capability of SHG FROG. We conclude that, despite the above drawbacks, SHG FROG should be useful in measuring low-energy pulses. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP DELONG, KW (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,MS-9057,LIVERMORE,CA 94551, USA. NR 25 TC 242 Z9 248 U1 3 U2 35 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD NOV PY 1994 VL 11 IS 11 BP 2206 EP 2215 DI 10.1364/JOSAB.11.002206 PG 10 WC Optics SC Optics GA PQ365 UT WOS:A1994PQ36500007 ER PT J AU KONNO, H LOMDAHL, PS AF KONNO, H LOMDAHL, PS TI THE WIGNER TRANSFORM OF SOLITON-SOLUTIONS FOR THE NONLINEAR SCHRODINGER-EQUATION SO JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN LA English DT Article DE NONLINEAR SCHRODINGER EQUATION; WIGNER TRANSFORM; WAVELET; SOLITON-SOLITON INTERACTION; QUANTUM-CLASSICAL CORRESPONDENCE; SOLITON IN OPEN SYSTEMS ID MECHANICS; QUANTUM AB The Wigner function, a kind of wavelet transform is studied for one- and two-soliton solutions to the nonlinear Schrodinger equation. The exact expression of the Wigner transform for the one-soliton solution is obtained. The features of soliton-soliton interaction of different two-soliton states, the states of coherence analogous to that of two-localized wave packets in quantum mechanics, are displayed. Suitability of this transform for analyzing ''soliton'' in open systems is also discussed. C1 LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. LOS ALAMOS NATL LAB, CTR NONLINEAR STUDIES, LOS ALAMOS, NM 87545 USA. RP KONNO, H (reprint author), UNIV TSUKUBA, INST SCI MAT, TSUKUBA, IBARAKI 305, JAPAN. NR 9 TC 9 Z9 9 U1 0 U2 2 PU PHYSICAL SOC JAPAN PI TOKYO PA YUSHIMA URBAN BUILDING 5F, 2-31-22 YUSHIMA, BUNKYO-KU, TOKYO, 113-0034, JAPAN SN 0031-9015 J9 J PHYS SOC JPN JI J. Phys. Soc. Jpn. PD NOV PY 1994 VL 63 IS 11 BP 3967 EP 3973 DI 10.1143/JPSJ.63.3967 PG 7 WC Physics, Multidisciplinary SC Physics GA PT767 UT WOS:A1994PT76700012 ER PT J AU SCHULZE, RK TAYLOR, TN PAFFETT, MT AF SCHULZE, RK TAYLOR, TN PAFFETT, MT TI AL DEPOSITION ON FE - FORMATION OF AN IRON ALUMINIDE SURFACE ALLOY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article ID ENERGIES; AL(111); GROWTH RP SCHULZE, RK (reprint author), LOS ALAMOS NATL LAB,DIV CHEM SCI & TECHNOL,POB 1663,LOS ALAMOS,NM 87545, USA. NR 15 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 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD NOV-DEC PY 1994 VL 12 IS 6 BP 3054 EP 3061 DI 10.1116/1.578935 PG 8 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA PT803 UT WOS:A1994PT80300009 ER PT J AU BALOOCH, M HAMZA, AV AF BALOOCH, M HAMZA, AV TI SIC MICROCOMPONENTS VIA REACTION OF C-60 WITH SILICON SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Note RP BALOOCH, M (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 3 TC 10 Z9 10 U1 2 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-211X J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1994 VL 12 IS 6 BP 3218 EP 3219 DI 10.1116/1.587503 PG 2 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA PY133 UT WOS:A1994PY13300024 ER PT J AU VAWTER, GA ASHBY, CIH AF VAWTER, GA ASHBY, CIH TI REACTIVE-ION-BEAM ETCHING OF INP IN A CHLORINE-HYDROGEN MIXTURE SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 38th International Symposium on Electron, Ion and Photon Beams CY MAY 31-JUN 03, 1994 CL NEW ORLEANS, LA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER ID CL2; SMOOTH RP VAWTER, GA (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 7 TC 26 Z9 26 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-211X J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1994 VL 12 IS 6 BP 3374 EP 3377 DI 10.1116/1.587515 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA PY133 UT WOS:A1994PY13300054 ER PT J AU MORAN, MJ AF MORAN, MJ TI COPLANAR MULTIPLE-RING ELECTROSTATIC PARTICLE-BEAM LENSES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 38th International Symposium on Electron, Ion and Photon Beams CY MAY 31-JUN 03, 1994 CL NEW ORLEANS, LA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER ID OPTICS RP MORAN, MJ (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 5 TC 0 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-211X J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1994 VL 12 IS 6 BP 3494 EP 3497 DI 10.1116/1.587457 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA PY133 UT WOS:A1994PY13300077 ER PT J AU CHALUPKA, A STENGL, G BUSCHBECK, H LAMMER, G VONACH, H FISCHER, R HAMMEL, E LOSCHNER, H NOWAK, R WOLF, P FINKELSTEIN, W HILL, RW BERRY, IL HARRIOTT, LR MELNGAILIS, J RANDALL, JN WOLFE, JC STROH, H WOLLNIK, H MONDELLI, AA PETILLO, JJ LEUNG, K AF CHALUPKA, A STENGL, G BUSCHBECK, H LAMMER, G VONACH, H FISCHER, R HAMMEL, E LOSCHNER, H NOWAK, R WOLF, P FINKELSTEIN, W HILL, RW BERRY, IL HARRIOTT, LR MELNGAILIS, J RANDALL, JN WOLFE, JC STROH, H WOLLNIK, H MONDELLI, AA PETILLO, JJ LEUNG, K TI NOVEL ELECTROSTATIC COLUMN FOR ION PROJECTION LITHOGRAPHY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 38th International Symposium on Electron, Ion and Photon Beams CY MAY 31-JUN 03, 1994 CL NEW ORLEANS, LA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER C1 ADV LITHOG GRP,COLUMBIA,MD 21045. DEPT DEF,MICROELECTR RES LAB,COLUMBIA,MD 21045. AT&T BELL LABS,MURRAY HILL,NJ 07974. UNIV MARYLAND,COLLEGE PK,MD 20742. TEXAS INSTRUMENTS INC,DALLAS,TX 75243. UNIV HOUSTON,HOUSTON,TX 77204. UNIV GIESSEN,D-35392 GIESSEN,GERMANY. SCI APPLICAT INT CORP,MCLEAN,VA 22102. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP CHALUPKA, A (reprint author), ION MICROFABRICAT SYST GMBH,A-1020 VIENNA,AUSTRIA. NR 6 TC 26 Z9 26 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-211X J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1994 VL 12 IS 6 BP 3513 EP 3517 DI 10.1116/1.587461 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA PY133 UT WOS:A1994PY13300081 ER PT J AU WENDT, JR PLUT, TA CORLESS, RF MARTENS, JS BERKOWITZ, S CHAR, K JOHANSSON, M HOU, SY PHILLIPS, JM AF WENDT, JR PLUT, TA CORLESS, RF MARTENS, JS BERKOWITZ, S CHAR, K JOHANSSON, M HOU, SY PHILLIPS, JM TI NANOMETER-SCALE PATTERNING OF HIGH-T-C SUPERCONDUCTORS FOR JOSEPHSON JUNCTION-BASED DIGITAL CIRCUITS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 38th International Symposium on Electron, Ion and Photon Beams CY MAY 31-JUN 03, 1994 CL NEW ORLEANS, LA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER C1 CONDUCTUS INC,SUNNYVALE,CA 94086. AT&T BELL LABS,MURRAY HILL,NJ 07974. RP WENDT, JR (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 13 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-211X J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1994 VL 12 IS 6 BP 3607 EP 3610 DI 10.1116/1.587480 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA PY133 UT WOS:A1994PY13300100 ER PT J AU ARAFA, M YOUTSEY, C GRUNDBACHER, R ADESIDA, I KLEM, J AF ARAFA, M YOUTSEY, C GRUNDBACHER, R ADESIDA, I KLEM, J TI FABRICATION OF NANOSTRUCTURES IN ALGASB INAS USING ELECTRON-BEAM LITHOGRAPHY AND CHEMICALLY ASSISTED ION-BEAM ETCHING SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 38th International Symposium on Electron, Ion and Photon Beams CY MAY 31-JUN 03, 1994 CL NEW ORLEANS, LA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER ID INDIUM ARSENIDE; QUANTUM C1 UNIV ILLINOIS,DEPT ELECT & COMP ENGN,URBANA,IL 61801. SANDIA NATL LABS,COMPOUND SEMICOND LAB,ALBUQUERQUE,NM 87185. RP ARAFA, M (reprint author), UNIV ILLINOIS,CTR COMPOUND SEMICOND MICROELECTR,COORDINATED SCI LAB,MAT RES LAB,URBANA,IL 61801, USA. NR 4 TC 8 Z9 8 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-211X J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1994 VL 12 IS 6 BP 3623 EP 3625 DI 10.1116/1.587626 PG 3 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA PY133 UT WOS:A1994PY13300104 ER PT J AU WEI, M ATTWOOD, DT GUSTAFSON, TK ANDERSON, EH AF WEI, M ATTWOOD, DT GUSTAFSON, TK ANDERSON, EH TI PATTERNING A 50-NM PERIOD GRATING USING SOFT-X-RAY SPATIAL-FREQUENCY MULTIPLICATION SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 38th International Symposium on Electron, Ion and Photon Beams CY MAY 31-JUN 03, 1994 CL NEW ORLEANS, LA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER ID DIMENSIONAL ELECTRON-GAS; LITHOGRAPHY C1 UNIV CALIF BERKELEY,DEPT ELECT ENGN & COMP SCI,BERKELEY,CA 94720. RP WEI, M (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR XRAY OPT,BERKELEY,CA 94720, USA. NR 18 TC 25 Z9 26 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-211X J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1994 VL 12 IS 6 BP 3648 EP 3652 DI 10.1116/1.587632 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA PY133 UT WOS:A1994PY13300110 ER PT J AU KUBIAK, GD TICHENOR, DA RAYCHAUDHURI, AK MALINOWSKI, ME STULEN, RH HANEY, SJ BERGER, KW NISSEN, RP WILKERSON, GA PAUL, PH BJORKHOLM, JE FETTER, LA FREEMAN, RR HIMEL, MD MACDOWELL, AA TENNANT, DM WOOD, OR WASKIEWICZ, WK WHITE, DL WINDT, DL JEWELL, TE AF KUBIAK, GD TICHENOR, DA RAYCHAUDHURI, AK MALINOWSKI, ME STULEN, RH HANEY, SJ BERGER, KW NISSEN, RP WILKERSON, GA PAUL, PH BJORKHOLM, JE FETTER, LA FREEMAN, RR HIMEL, MD MACDOWELL, AA TENNANT, DM WOOD, OR WASKIEWICZ, WK WHITE, DL WINDT, DL JEWELL, TE TI CHARACTERIZATION OF AN EXPANDED-FIELD SCHWARZSCHILD OBJECTIVE FOR EXTREME-ULTRAVIOLET LITHOGRAPHY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 38th International Symposium on Electron, Ion and Photon Beams CY MAY 31-JUN 03, 1994 CL NEW ORLEANS, LA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER ID RAY PROJECTION LITHOGRAPHY; LASER PLASMA SOURCE; REDUCTION C1 AT&T BELL LABS,HOLMDEL,NJ 07733. AT&T BELL LABS,MURRAY HILL,NJ 07974. OPT ENGN CONSULTANT,BOULDER,CO 80304. RP KUBIAK, GD (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. NR 19 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 0734-211X J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1994 VL 12 IS 6 BP 3820 EP 3825 DI 10.1116/1.587448 PG 6 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA PY133 UT WOS:A1994PY13300144 ER PT J AU NGUYEN, KB MIZOTA, T HAGA, T KINOSHITA, H ATTWOOD, DT AF NGUYEN, KB MIZOTA, T HAGA, T KINOSHITA, H ATTWOOD, DT TI IMAGING OF EXTREME-ULTRAVIOLET LITHOGRAPHIC MASKS WITH PROGRAMMED SUBSTRATE DEFECTS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 38th International Symposium on Electron, Ion and Photon Beams CY MAY 31-JUN 03, 1994 CL NEW ORLEANS, LA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER ID RAY PROJECTION LITHOGRAPHY; REDUCTION LITHOGRAPHY; REPAIR C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR XRAY OPT,BERKELEY,CA 94720. RP NGUYEN, KB (reprint author), UNIV CALIF BERKELEY,DEPT EECS,BERKELEY,CA 94720, USA. NR 21 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 0734-211X J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1994 VL 12 IS 6 BP 3833 EP 3840 DI 10.1116/1.587450 PG 8 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA PY133 UT WOS:A1994PY13300146 ER PT J AU WOOD, OR BJORKHOLM, JE FETTER, L HIMEL, MD TENNANT, DM MACDOWELL, AA LAFONTAINE, B GRIFFITH, JE TAYLOR, GN WASKIEWICZ, WK WINDT, DL KORTRIGHT, JB GULLIKSON, EK NGUYEN, K AF WOOD, OR BJORKHOLM, JE FETTER, L HIMEL, MD TENNANT, DM MACDOWELL, AA LAFONTAINE, B GRIFFITH, JE TAYLOR, GN WASKIEWICZ, WK WINDT, DL KORTRIGHT, JB GULLIKSON, EK NGUYEN, K TI WAVELENGTH DEPENDENCE OF THE RESIST SIDEWALL ANGLE IN EXTREME-ULTRAVIOLET LITHOGRAPHY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 38th International Symposium on Electron, Ion and Photon Beams CY MAY 31-JUN 03, 1994 CL NEW ORLEANS, LA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER ID PROJECTION LITHOGRAPHY; DEEP-ULTRAVIOLET; REDUCTION C1 AT&T BELL LABS,BROOKHAVEN NATL LAB,UPTON,NY 11973. AT&T BELL LABS,MURRAY HILL,NJ 07974. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP WOOD, OR (reprint author), AT&T BELL LABS,CRAWFORDS CORNER RD,HOLMDEL,NJ 07733, USA. NR 12 TC 3 Z9 3 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-211X J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1994 VL 12 IS 6 BP 3841 EP 3845 DI 10.1116/1.587451 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA PY133 UT WOS:A1994PY13300147 ER PT J AU HUTTON, RS STEIN, SM BOYCE, CH CIRELLI, RA TAYLOR, GN BAIOCCHI, FA KOVALCHICK, J WHEELER, DR AF HUTTON, RS STEIN, SM BOYCE, CH CIRELLI, RA TAYLOR, GN BAIOCCHI, FA KOVALCHICK, J WHEELER, DR TI POSITIVE-TONE SILYLATED, DRY-DEVELOPED, DEEP-ULTRAVIOLET RESIST WITH 0.2 MU-M RESOLUTION SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 38th International Symposium on Electron, Ion and Photon Beams CY MAY 31-JUN 03, 1994 CL NEW ORLEANS, LA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER C1 AT&T BELL LABS,ALLENTOWN,PA 18103. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP HUTTON, RS (reprint author), AT&T BELL LABS,MURRAY HILL,NJ 07974, USA. NR 8 TC 4 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-211X J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1994 VL 12 IS 6 BP 3919 EP 3924 DI 10.1116/1.587575 PG 6 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA PY133 UT WOS:A1994PY13300162 ER PT J AU DIFABRIZIO, E GENTILI, M GRELLA, L BACIOCCHI, M KRASNOPEROVA, A CERRINA, F YUN, W LAI, B GLUSKIN, E AF DIFABRIZIO, E GENTILI, M GRELLA, L BACIOCCHI, M KRASNOPEROVA, A CERRINA, F YUN, W LAI, B GLUSKIN, E TI HIGH-PERFORMANCE MULTILEVEL BLAZED X-RAY MICROSCOPY FRESNEL ZONE PLATES - FABRICATED USING X-RAY-LITHOGRAPHY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 38th International Symposium on Electron, Ion and Photon Beams CY MAY 31-JUN 03, 1994 CL NEW ORLEANS, LA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER ID MASK C1 UNIV WISCONSIN,CTR XRAY LITHOG,DEPT ELECT & COMP ENGN,MADISON,WI 53706. ARGONNE NATL LAB,ARGONNE,IL 60439. RP DIFABRIZIO, E (reprint author), CNR,IST ELETTRON STATO SOLIDO,I-00156 ROME,ITALY. NR 10 TC 31 Z9 31 U1 1 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-211X J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1994 VL 12 IS 6 BP 3979 EP 3985 DI 10.1116/1.587414 PG 7 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA PY133 UT WOS:A1994PY13300173 ER PT J AU MALEK, CK JACKSON, K BRENNEN, RA HECHT, MH BONIVERT, WD HRUBY, J AF MALEK, CK JACKSON, K BRENNEN, RA HECHT, MH BONIVERT, WD HRUBY, J TI DEEP-ETCH X-RAY-LITHOGRAPHY AT THE ADVANCED LIGHT-SOURCE - FIRST RESULTS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 38th International Symposium on Electron, Ion and Photon Beams CY MAY 31-JUN 03, 1994 CL NEW ORLEANS, LA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER C1 CALTECH,JET PROP LAB,CTR SPACE MICROELECTR,PASADENA,CA 91109. SANDIA NATL LABS,DEPT MAT SYNTH,LIVERMORE,CA 94551. RP MALEK, CK (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR XRAY OPT,BERKELEY,CA 94720, USA. NR 8 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-211X J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1994 VL 12 IS 6 BP 4009 EP 4012 DI 10.1116/1.587420 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA PY133 UT WOS:A1994PY13300179 ER PT J AU FREUND, R BAUER, PH CRISSMAN, HA BRADBURY, EM BENJAMIN, TL AF FREUND, R BAUER, PH CRISSMAN, HA BRADBURY, EM BENJAMIN, TL TI HOST-RANGE AND CELL-CYCLE ACTIVATION PROPERTIES OF POLYOMAVIRUS LARGE T-ANTIGEN MUTANTS DEFECTIVE IN PRB BINDING SO JOURNAL OF VIROLOGY LA English DT Article ID RETINOBLASTOMA GENE-PRODUCT; HUMAN PAPILLOMAVIRUS TYPE-16; E2F TRANSCRIPTION FACTOR; ADENOVIRUS E1A PROTEINS; LARGE TUMOR-ANTIGEN; HR-T; MOUSE FIBROBLASTS; VIRUS; TRANSFORMATION; P53 AB We have examined the growth properties of polyomavirus large T-antigen mutants that are unable to bind pRB, the product of the retinoblastoma tumor suppressor gene. These mutants grow poorly on primary mouse cells yet grow well on NIH 3T3 and other established mouse cell lines. Preinfection of primary baby mouse kidney (BMK) epithelial cells with wild-type simian virus 40 renders these cells permissive to growth of pRB-binding polyomavirus mutants. Conversely, NIH 3T3 cells transfected by and expressing wild-type human pRB become nonpermissive. Primary fibroblasts from mouse embryos that carry a homozygous knockout of the RB gene are permissive, while those from normal littermates are nonpermissive. The host range of polyomavirus pRB-binding mutants is thus determined by expression or lack of expression of functional pRB by the host. These results demonstrate the importance of pRB binding by large T antigen for productive viral infection in primary cells. Failure of pRB-binding mutants to grow well in BMK cells correlates with their failure to induce progression from G(0) or G(1) through the S phase of the cell cycle. Time course studies show delayed synthesis and lower levels of accumulation of large T antigen, viral DNA, and VP1 in mutant compared with wild-type virus-infected BMK cells. These results support a model in which productive infection by polyomavirus in normal mouse cells is tightly coupled to the induction and progression of the cell cycle. C1 UNIV MARYLAND,SCH MED,DEPT MICROBIOL & IMMUNOL,BALTIMORE,MD 21201. HARVARD UNIV,SCH MED,DEPT PATHOL,BOSTON,MA 02115. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV CALIF DAVIS,SCH MED,DEPT BIOL CHEM,DAVIS,CA 95616. FU NCI NIH HHS [R35-CA44343]; NCRR NIH HHS [P41-RR01315, R24-RR06758] NR 49 TC 27 Z9 27 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0022-538X J9 J VIROL JI J. Virol. PD NOV PY 1994 VL 68 IS 11 BP 7227 EP 7234 PG 8 WC Virology SC Virology GA PL736 UT WOS:A1994PL73600045 PM 7933105 ER PT J AU KORBER, BTM KUNSTMAN, KJ PATTERSON, BK FURTADO, M MCEVILLY, MM LEVY, R WOLINSKY, SM AF KORBER, BTM KUNSTMAN, KJ PATTERSON, BK FURTADO, M MCEVILLY, MM LEVY, R WOLINSKY, SM TI GENETIC-DIFFERENCES BETWEEN BLOOD-DERIVED AND BRAIN-DERIVED VIRAL SEQUENCES FROM HUMAN-IMMUNODEFICIENCY-VIRUS TYPE-1-INFECTED PATIENTS - EVIDENCE OF CONSERVED ELEMENTS IN THE V3-REGION OF THE ENVELOPE PROTEIN OF BRAIN-DERIVED SEQUENCES SO JOURNAL OF VIROLOGY LA English DT Article ID PRINCIPAL NEUTRALIZING DETERMINANT; AMINO-ACID SUBSTITUTION; CD4 BINDING-SITE; MACROPHAGE TROPISM; MICROGLIAL CELLS; MONONUCLEAR PHAGOCYTES; CEREBROSPINAL-FLUID; GLYCOSYLATION SITES; PRIMARY INFECTION; MEMBRANE-FUSION AB Human immunodeficiency virus type 1 (HIV-1) sequences were generated from blood and from brain tissue obtained by stereotactic biopsy from six patients undergoing a diagnostic neurosurgical procedure. Proviral DNA was directly amplified by nested PCR, and 8 to 36 clones from each sample were sequenced. Phylogenetic analysis of intrapatient envelope V3-V5 region HIV-1 DNA sequence sets revealed that brain viral sequences were clustered relative to the blood viral sequences, suggestive of tissue-specific compartmentalization of the virus in four of the six cases. In the other two cases, the blood and brain virus sequences were intermingled in the phylogenetic analyses, suggesting trafficking of virus between the two tissues. Slide-based PCR-driven in situ hybridization of two of the patients' brain biopsy samples confirmed our interpretation of the intrapatient phylogenetic analyses. Interpatient V3 region brain-derived sequence distances were significantly less than blood-derived sequence distances. Relative to the tip of the loop, the set of brain-derived viral sequences had a tendency towards negative or neutral charge compared with the set of blood-derived viral sequences. Entropy calculations were used as a measure of the variability at each position in alignments of blood and brain viral sequences. A relatively conserved set of positions were found, with a significantly lower entropy in the brain than in the blood-derived viral sequences. These sites constitute a brain ''signature pattern,'' or a noncontiguous set of amino acids in the V3 region conserved in viral sequences derived from brain tissue. This brain-derived signature pattern was also well preserved among isolates previously characterized in vitro as macrophage tropic. Macrophage monocyte tropism may be the biological constraint that results in the conservation of the viral brain signature pattern. C1 NORTHWESTERN UNIV,SCH MED,DEPT MED,CHICAGO,IL 60611. LOS ALAMOS NATL LAB,DIV THEORY,LOS ALAMOS,NM 87545. SANTA FE INST,SANTA FE,NM 87501. NORTHWESTERN UNIV,SCH MED,DEPT NEUROSURG,CHICAGO,IL 60611. RI Wolinsky, Steven/B-2893-2012; OI Korber, Bette/0000-0002-2026-5757 FU PHS HHS [3-Y01-A1-70001-11, 5-U01-A135039] NR 85 TC 270 Z9 275 U1 0 U2 1 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0022-538X J9 J VIROL JI J. Virol. PD NOV PY 1994 VL 68 IS 11 BP 7467 EP 7481 PG 15 WC Virology SC Virology GA PL736 UT WOS:A1994PL73600072 PM 7933130 ER PT J AU STANLEY, BJ GUIOCHON, G AF STANLEY, BJ GUIOCHON, G TI IMPORTANCE OF THE ACCURACY OF EXPERIMENTAL-DATA IN THE NONLINEAR CHROMATOGRAPHIC DETERMINATION OF ADSORPTION ENERGY-DISTRIBUTIONS SO LANGMUIR LA English DT Article ID GAS SOLID CHROMATOGRAPHY; ISOTHERM DATA; EXPECTATION-MAXIMIZATION; SURFACES; CONSTANT AB Adsorption energy distributions (AEDs) are calculated from the classical, fundamental integral equation of adsorption using adsorption isotherms and the expectation-maximization method of parameter estimation. The adsorption isotherms are calculated from nonlinear elution profiles obtained from gas chromatographic data using the characteristic points method of finite concentration chromatography. Porous layer open tubular capillary columns are used to support the adsorbent. The performance of these columns is compared to that of packed columns in terms of their ability to supply accurate isotherm data and AEDs, The effect of the finite column efficiency and the limited loading factor on the accuracy of the estimated energy distributions is presented. This accuracy decreases with decreasing efficiency, and approximately 5000 theoretical plates are needed when the loading factor, L(f), equals 0.56 for sampling of a unimodal Gaussian distribution. Increasing L(f) further increases the contribution of finite efficiency to the AED and causes a divergence at the low-energy endpoint if too high. This occurs as the retention time approaches the holdup time. Data are presented for diethyl ether adsorption on porous silica and its C-18-bonded derivative. Both the frontal-analysis-by-characteristic-points (FACP) and the elution-by-characteristic-points (ECP) methods of gas chromatography are presented. The FACP experiment yielded divergent results at high column loadings for this system. The results indicate that the accuracy of estimated AEDs with respect to the true, underlying distribution of the surface is poor for most studies of this nature. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. NR 36 TC 38 Z9 38 U1 2 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD NOV PY 1994 VL 10 IS 11 BP 4278 EP 4285 DI 10.1021/la00023a059 PG 8 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA PT251 UT WOS:A1994PT25100059 ER PT J AU STOLZ, CJ KOZLOWSKI, MR AF STOLZ, CJ KOZLOWSKI, MR TI REDUCE DEFECTS TO INCREASE LASER DAMAGE THRESHOLD SO LASER FOCUS WORLD LA English DT Article RP STOLZ, CJ (reprint author), LAWRENCE LIVERMORE NATL LAB,ICF OPT COATINGS GRP,POB 808,LIVERMORE,CA 94551, USA. NR 0 TC 0 Z9 0 U1 2 U2 2 PU PENNWELL PUBL CO PI NASHUA PA 5TH FLOOR TEN TARA BOULEVARD, NASHUA, NH 03062-2801 SN 0740-2511 J9 LASER FOCUS WORLD JI Laser Focus World PD NOV PY 1994 VL 30 IS 11 BP 83 EP & PG 0 WC Optics SC Optics GA PQ844 UT WOS:A1994PQ84400019 ER PT J AU RIEKER, TP JANULIS, EP AF RIEKER, TP JANULIS, EP TI ENHANCED THERMAL RESPONSE OF THE S(A)(D1) LAYER THICKNESS IN HIGHLY FLUORINATED THERMOTROPIC LIQUID-CRYSTALS SO LIQUID CRYSTALS LA English DT Article ID DENSITY AB X-ray studies of a homologous series of rod-shaped liquid crystal molecules with one tail perfluorinated and the other protonated, reveal large decreases in the smectic A layer spacing with increasing temperature. These materials form unique dimer phases in which the smectic layer spacing is dependent on the length of the perfluorinated tail and independent of the length of the protonated tail. The chain statistics of the perfluorinated tail significantly influence the thermal expansion coefficient since the length of the fluorinated tail defines the smectic layer spacing. Thermal expansion coefficients for the layer spacing observed here are negative and nearly an order of magnitude greater than for typical protonated rod-shaped thermotropic liquid crystals in the SA phase. C1 THREE M CO,CORP RES LABS,ST PAUL,MN 55144. RP RIEKER, TP (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 19 TC 11 Z9 11 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0267-8292 J9 LIQ CRYST JI Liq. Cryst. PD NOV PY 1994 VL 17 IS 5 BP 681 EP 687 DI 10.1080/02678299408037339 PG 7 WC Chemistry, Multidisciplinary; Crystallography; Materials Science, Multidisciplinary SC Chemistry; Crystallography; Materials Science GA PP321 UT WOS:A1994PP32100008 ER PT J AU TAKIGUCHI, Y CHEN, DJ AF TAKIGUCHI, Y CHEN, DJ TI GENOMIC STRUCTURE OF THE MOUSE APURINIC/APYRIMIDINIC ENDONUCLEASE GENE SO MAMMALIAN GENOME LA English DT Article ID DNA-REPAIR ENZYME; APURINIC APYRIMIDINIC ENDONUCLEASE; COLI EXONUCLEASE-III; ESCHERICHIA-COLI; NUCLEOTIDE-SEQUENCE; BINDING ACTIVITY; APEX NUCLEASE; CDNA; EXPRESSION; HAP1 AB A mammalian apurinic/apyrimidinic endonuclease (AP endonuclease) is known to have two distinct functional domains. One domain is responsible for regulating the activity of Fos/Jun proto-oncogene products to bind to DNA at specific recognition sites. The other domain, which is highly conserved from bacteria to mammals, is responsible for repairing DNA damage caused by ionizing radiation, oxidative damage, and alkylating agents. This study reports on the isolation and characterization of the genomic structure of the mouse AP endonuclease gene (Apex). The genomic sequence of the Apex gene was 2.14 kb in length and contained four exons. Exon 1 contained a 0.24-kb untranslated 5' region upstream of the initiation codon. Consensus sequences for two CAAT boxes and a GC box were found upstream of the end of exon 1. A polymorphism was noted in the untranslated region of exon 1 in a comparison of a number of mouse strains. These data indicate that the 5' end of the mouse gene (Apex) differs from the previously isolated human gene (Ape), which has five exons and an untranslated region between exons 1 and 2. Data are also presented that suggest the presence of two pseudogenes in the mouse. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI LS1,LOS ALAMOS,NM 87545. NR 20 TC 7 Z9 9 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0938-8990 J9 MAMM GENOME JI Mamm. Genome PD NOV PY 1994 VL 5 IS 11 BP 717 EP 722 DI 10.1007/BF00426079 PG 6 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Genetics & Heredity SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Genetics & Heredity GA PP615 UT WOS:A1994PP61500009 PM 7533013 ER PT J AU BROWN, DL AF BROWN, DL TI AN UNSPLIT GODUNOV METHOD FOR SYSTEMS OF CONSERVATION-LAWS ON CURVILINEAR OVERLAPPING GRIDS SO MATHEMATICAL AND COMPUTER MODELLING LA English DT Article; Proceedings Paper CT Conference on Theory and Numerical Methods for Initial-Boundary Value Problems CY DEC 06-12, 1992 CL OBERWOLFACH, GERMANY ID ADAPTIVE MESH REFINEMENT; DIFFERENTIAL-EQUATIONS; SCHEMES AB The overlapping grid or Chimera method for representation of complex geometries within the context of finite difference methods has been used effectively for a variety of problems, particularly in the area hydrodynamic simulation. In this paper, we introduce a second-order unsplit upwind method of Godunov type for curvilinear coordinates and apply it to gas dynamics simulations involving complex geometries by using overlapping grids. RP BROWN, DL (reprint author), LOS ALAMOS NATL LAB,DIV COMP & COMMUN,POB 1663,LOS ALAMOS,NM 87545, USA. NR 36 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 0895-7177 J9 MATH COMPUT MODEL JI Math. Comput. Model. PD NOV-DEC PY 1994 VL 20 IS 10-11 BP 29 EP 48 DI 10.1016/0895-7177(94)90168-6 PG 20 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA PV700 UT WOS:A1994PV70000003 ER PT J AU COUTRAKON, G HUBBARD, J JOHANNING, J MAUDSLEY, G SLATON, T MORTON, P AF COUTRAKON, G HUBBARD, J JOHANNING, J MAUDSLEY, G SLATON, T MORTON, P TI A PERFORMANCE STUDY OF THE LOMA-LINDA PROTON MEDICAL ACCELERATOR SO MEDICAL PHYSICS LA English DT Article DE PROTON; ACCELERATOR; SYNCHROTRON; RADIATION THERAPY C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,PALO ALTO,CA 94304. RP COUTRAKON, G (reprint author), LOMA LINDA UNIV,MED CTR,11234 ANDERSON ST,LOMA LINDA,CA 92354, USA. NR 14 TC 26 Z9 26 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0094-2405 J9 MED PHYS JI Med. Phys. PD NOV PY 1994 VL 21 IS 11 BP 1691 EP 1701 DI 10.1118/1.597270 PG 11 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA PT138 UT WOS:A1994PT13800007 PM 7891629 ER PT J AU WILLIAMS, PT AUSTIN, MA KRAUSS, RM AF WILLIAMS, PT AUSTIN, MA KRAUSS, RM TI VARIATIONS IN HIGH-DENSITY-LIPOPROTEIN SUBCLASSES DURING THE MENSTRUAL-CYCLE SO METABOLISM-CLINICAL AND EXPERIMENTAL LA English DT Article ID GRADIENT GEL-ELECTROPHORESIS; A-II; GLUCOSE-TOLERANCE; HEPATIC LIPASE; SERUM-LIPIDS; WOMEN; ESTROGEN; PLASMA; APOLIPOPROTEIN; CHOLESTEROL AB In a study of 41 healthy premenopausal women, plasma high density lipoprotein-2a (HDL(2a)) levels (ie, HDL of diameter 8.8 to 9.7 nm) were significantly higher during the luteal phase than during the follicular phase of the cycle. There was no significant variation in HDL(2b) or any of the HDL(3) subclasses. Copyright (C) 1994 by W.B. Saunders Company C1 UNIV WASHINGTON,SCH PUBL HLTH & COMMUNITY MED,DEPT EPIDEMIOL,SEATTLE,WA 98195. RP WILLIAMS, PT (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BLDG 934,BERKELEY,CA 94720, USA. FU NHLBI NIH HHS [HL-24462, HL-18574, HL-02183]; NIA NIH HHS [R03 AG032004, R03 AG032004-01A1] NR 38 TC 5 Z9 5 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0026-0495 J9 METABOLISM JI Metab.-Clin. Exp. PD NOV PY 1994 VL 43 IS 11 BP 1438 EP 1441 DI 10.1016/0026-0495(94)90041-8 PG 4 WC Endocrinology & Metabolism SC Endocrinology & Metabolism GA PR059 UT WOS:A1994PR05900019 PM 7968600 ER PT J AU ZUREK, AK AF ZUREK, AK TI THE STUDY OF ADIABATIC SHEAR-BAND INSTABILITY IN A PEARLITIC 4340-STEEL USING A DYNAMIC PUNCH TEST SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID STRAIN RATES; METALS AB The formation of adiabatic shear band instabilities in a pearlitic 4340 steel using a dynamic punch test has been studied. The dynamic punch-impact test produced white-etching adiabatic shear bands. The average strain of 0.5 was sufficient to produce adiabatic shear bands in this steel at an average strain rate of 18,000 s(-1). Nanohardness variations found across the adiabatic shear band are thought to be caused by the fragmentation and spheroidization of the Fe3C and the overall deformation and work hardening of the pearlitic microstructure. The cracks formed at the termination of the adiabatic shear band caused the sample to fracture in a ductile mode. RP ZUREK, AK (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87544, USA. NR 27 TC 53 Z9 54 U1 2 U2 9 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD NOV PY 1994 VL 25 IS 11 BP 2483 EP 2489 DI 10.1007/BF02648867 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PN132 UT WOS:A1994PN13200016 ER PT J AU BALDWIN, MD CHIDAMBARAM, PR EDWARDS, GR AF BALDWIN, MD CHIDAMBARAM, PR EDWARDS, GR TI SPREADING AND INTERLAYER FORMATION AT THE COPPER-COPPER OXIDE POLYCRYSTALLINE ALUMINA INTERFACE SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID METALS; OXYGEN AB Spreadability and reaction layer growth rates of copper-oxygen alloys on polycrystalline alumina were measured above the melting point of copper to better understand the direct bonding pro- : cess. Spreading was measured as a function of composition and temperature by monitoring the diameter of molten droplets as a function of time. As the oxygen content of the melt increased from 0 to 3 wt pet, the spreading diameter increased linearly, at fixed time and temperature. Constant diameters were observed for oxygen compositions between approximately 3 and 6 wt pet. The diameters again increased linearly for oxygen concentrations greater than 7 wt pet. This behavior was explained by reference to the copper-oxygen binary phase equilibrium. An interfacial product was identified to be the complex oxide, CuAlO2. A detailed investigation of the interlayer growth kinetics was performed to understand the fundamental phenomena controlling the spreading rates. The growth rate of the CuAlO2 phase and the spreading rate were simultaneously measured for alumina in contact with a copper-2 wt pet oxygen alloy drop as a function of temperature. The reaction layer thickening,was found to be diffusion controlled, with an apparent activation energy of 309 kJ/mol, and the spreading rate did not correlate with the thickening rate. C1 DEPT MET & MAT ENGN,CTR WELDING & JOINING RES,GOLDEN,CO 80401. RP BALDWIN, MD (reprint author), SANDIA NATL LABS,LIQUID MET PROC LAB,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 29 TC 14 Z9 14 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD NOV PY 1994 VL 25 IS 11 BP 2497 EP 2506 DI 10.1007/BF02648869 PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PN132 UT WOS:A1994PN13200018 ER PT J AU PHELPS, TJ MURPHY, EM PFIFFNER, SM WHITE, DC AF PHELPS, TJ MURPHY, EM PFIFFNER, SM WHITE, DC TI COMPARISON BETWEEN GEOCHEMICAL AND BIOLOGICAL ESTIMATES OF SUBSURFACE MICROBIAL ACTIVITIES SO MICROBIAL ECOLOGY LA English DT Article ID DEEP TERRESTRIAL SUBSURFACE; TERMINAL CARBON METABOLISM; ATLANTIC COASTAL-PLAIN; SAVANNAH RIVER PLANT; SOUTH-CAROLINA; HETEROTROPHIC BACTERIA; ORGANIC-MATTER; SEDIMENTS; AQUIFER; LAKE AB Geochemical and biological estimates of in situ microbial activities were compared from the aerobic and microaerophilic sediments of the Atlantic Coastal Plain. Radioisotope time-course experiments suggested oxidation rates greater than millimolar quantities per year for acetate and glucose. Geochemical analyses assessing oxygen consumption, soluble organic carbon utilization, sulfate reduction, and carbon dioxide production suggested organic oxidation rates of nano- to micromolar quantities per year. Radiotracer timecourse experiments appeared to overestimate rates of organic carbon oxidation, sulfate reduction, and biomass production by a factor of 10(3)-10(6) greater than estimates calculated from groundwater analyses. Based on the geochemical evidence, in situ microbial metabolism was estimated to be in the nano- to micromolar range per year, and the average doubling time for the microbial community was estimated to be centuries. C1 OAK RIDGE NATL LAB, DIV ENVIRONM SCI, OAK RIDGE, TN 37831 USA. PACIFIC NW LAB, DEPT GEOSCI, RICHLAND, WA 99352 USA. RP PHELPS, TJ (reprint author), UNIV TENNESSEE, CTR ENVIRONM BIOTECHNOL, KNOXVILLE, TN 37932 USA. RI phelps, tommy/A-5244-2011 NR 38 TC 76 Z9 78 U1 1 U2 19 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0095-3628 J9 MICROBIAL ECOL JI Microb. Ecol. PD NOV-DEC PY 1994 VL 28 IS 3 BP 335 EP 349 DI 10.1007/BF00662027 PG 15 WC Ecology; Marine & Freshwater Biology; Microbiology SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Microbiology GA PU416 UT WOS:A1994PU41600001 PM 24186553 ER PT J AU PHELPS, TJ PFIFFNER, SM SARGENT, KA WHITE, DC AF PHELPS, TJ PFIFFNER, SM SARGENT, KA WHITE, DC TI FACTORS INFLUENCING THE ABUNDANCE AND METABOLIC CAPACITIES OF MICROORGANISMS IN EASTERN COASTAL-PLAIN SEDIMENTS SO MICROBIAL ECOLOGY LA English DT Article ID DEEP SUBSURFACE SEDIMENTS; SAVANNAH RIVER PLANT; MICROBIAL ACTIVITY; TERRESTRIAL SUBSURFACE; SOUTH-CAROLINA; BACTERIA; AQUIFER; GROUNDWATER; ENVIRONMENTS; GEOCHEMISTRY AB The abundance and metabolic capacities of microorganisms residing in 49 sediment samples from 4 boreholes in Atlantic Coastal Plain sediments were examined. Radiolabeled time-course experiments assessing in situ mirobial capacities were initiated within 30 min of core recovery. Acetate (1-C-14- and H-3-) incorporation into lipids, microbial colony forming units, and nutrient limitations were examined in aliquots of subsurface sediments. Water-saturated sands exhibited activity and numbers of viable microorganisms that were orders of magnitude greater than those of the low permeability dense clays. Increased radioisotope utilization rates were observed after 6-24-h incubation times when sediments were amended with additional water and/or nutrients. Supplements of water, phosphate, nitrate, sulfate, glucose, or minerals resulted in the stimulation of microbial activities, as evidenced by the rate of acetate incorporation into microbial lipids. Additions of water or phosphate resulted in the greatest stimulation of microbial activities. Regardless of depth, sediments that contained >20% clay particles exhibited lower activities and biomass densities, and greater stimulation with abundant water supplementation than did sediments containing >66% sands and hydraulic conductivities >200 mu m sec.(-1). C1 FURMAN UNIV,DEPT GEOL,GREENVILLE,SC 29613. UNIV TENNESSEE,CTR ENVIRONM BIOTECHNOL,KNOXVILLE,TN 37932. RP PHELPS, TJ (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. RI phelps, tommy/A-5244-2011 NR 39 TC 35 Z9 36 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0095-3628 J9 MICROBIAL ECOL JI Microb. Ecol. PD NOV-DEC PY 1994 VL 28 IS 3 BP 351 EP 364 DI 10.1007/BF00662028 PG 14 WC Ecology; Marine & Freshwater Biology; Microbiology SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Microbiology GA PU416 UT WOS:A1994PU41600002 PM 24186554 ER PT J AU HIBBSBRENNER, MK SCHNEIDER, RP MORGAN, RA WALTERSON, RA LEHMAN, JA KALWEIT, EL LOTT, JA LEAR, KL CHOQUETTE, KD JUERGENSEN, H AF HIBBSBRENNER, MK SCHNEIDER, RP MORGAN, RA WALTERSON, RA LEHMAN, JA KALWEIT, EL LOTT, JA LEAR, KL CHOQUETTE, KD JUERGENSEN, H TI METALORGANIC VAPOR-PHASE EPITAXIAL-GROWTH OF RED AND INFRARED VERTICAL-CAVITY SURFACE-EMITTING LASER-DIODES SO MICROELECTRONICS JOURNAL LA English DT Article ID DISTRIBUTED BRAGG REFLECTORS; RESISTANCE; PERFORMANCE; DESIGN; MOCVD AB Metalorganic vapour phase epitaxy (MOVPE) is used For the growth of vertical-cavity surface-emitting laser (VCSEL) diodes. MOVPE exhibits a number of important advantages over the more commonly used molecular beam epitaxial (MBE) techniques, including ease of continuous compositional and dopant grading for low-resistance p-type distributed Bragg reflectors (DBRs), higher growth rates for rapid throughput and greater versatility in choice of materials, especially with phosphorus, and dopants. Top-emitting InGaAs/AlGaAs/AlAs 950 nm VCSELs exhibit the highest power conversion (wallplug) efficiencies (21%), lowest threshold voltage (1.47 V), and highest single mode power (4.4 mW from an 8 mu m device) yet reported. GaAs/AlGaAs/AlAs VCSELs lasing near 850 nm have demonstrated record low threshold voltage (1.7 V) at this wavelength, and excellent uniformity in wavelength (+/- 1%) across a 3-inch wafer, and in threshold voltage (+/- 1.5%), threshold current (+/- 10%) and output power (+/- 20%) across a 34-element array. 650 nm VCSELs based on AlGaInP/AlGaAs heterostructures have been demonstrated by MOVPE only, and lase continuous wave at room temperature, with voltage thresholds between 2.5 and 3 V and maximum power outputs of over 0.3 mW. These results establish MOVPE as a proven growth technique for this important new family of photonic devices. C1 SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. AIXTRON SEMICOND TECHNOL GMBH, AACHEN, GERMANY. RP HIBBSBRENNER, MK (reprint author), HONEYWELL TECHNOL CTR, BLOOMINGTON, MN 55420 USA. NR 26 TC 8 Z9 8 U1 2 U2 7 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0026-2692 EI 1879-2391 J9 MICROELECTRON J JI Microelectron. J. PD NOV PY 1994 VL 25 IS 8 BP 747 EP 755 DI 10.1016/0026-2692(94)90138-4 PG 9 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology SC Engineering; Science & Technology - Other Topics GA QB540 UT WOS:A1994QB54000013 ER PT J AU TOMPA, GS BREILAND, WG GURARY, A ZAWADZKI, PA EVANS, GH ESHERICK, P KROLL, B STALL, RA AF TOMPA, GS BREILAND, WG GURARY, A ZAWADZKI, PA EVANS, GH ESHERICK, P KROLL, B STALL, RA TI LARGE-AREA, PRODUCTION MOCVD ROTATING-DISK REACTOR DEVELOPMENT AND CHARACTERISTICS SO MICROELECTRONICS JOURNAL LA English DT Article ID VAPOR-DEPOSITION REACTOR; HEAT-TRANSFER; FLOW; UNIFORMITY AB The compound semiconductor industry is poised for rapid market advances during the next several years and this is creating a need for development of economical and high yield production equipment. These development efforts increasingly rely on advanced modelling with experimental verification. We report here on the utilization of modeling to rapidly develop a large scale production Rotating Disk Reactor (RDR). The influence of the equipment design and deposition process parameters on flow and temperature uniformity and on process characteristics are analyzed in this payer. Three dimensional Navier-Stokes flow modelling has been used to study the effect of an asymmetric exhaust at the base of the reactor on the uniformity of the rotating disk boundary layer in a scaled RDR. Results show that the asymmetric exhaust port does not disrupt the symmetry of the flow above the rotating disk for typical operating conditions, and for hydrogen flow the convective heat transfer from the disk is quite uniform (2% variation) over most (80%) of the surface. Thermal modelling of the RDR, which includes heat transfer by radiation, convection and conductance, was used to improve the temperature uniformity. Use of the recently developed Rotating Wafer Thermal Mapping (RWTM) technique verified the temperature distribution across the wafer under operational conditions, with measured uniformities of 1.3 degrees C and 2.5 degrees C for 2'' and 4'' wafers, respectively. In-situ thermocouples were used to control substrate heating. The substrate temperature uniformity was found to depend strongly upon the process temperature, process pressure, gas composition, gas flow, and wafer carrier rotation speed. This in turn affects the properties of the sown Films. This new reactor has been used to produce multiple 4'' GaAs/AlAs Bragg reflectors with < 1.0% variation in peak reflectivity wavelength, 4'' GaAs Si doped epilayers with < 2.0% doping uniformity, and to simultaneously demonstrate multiple 2'' InGaP films with better than +/- 0.75 nm photoluminescence wavelength uniformity. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. SANDIA NATL LABS,LIVERMORE,CA 94551. RP TOMPA, GS (reprint author), EMCORE CORP,RES LABS,SOMERSET,NJ 08873, USA. RI Schaff, William/B-5839-2009 NR 12 TC 5 Z9 5 U1 0 U2 2 PU ELSEVIER ADVANCED TECHNOLOGY PI OXFORD PA OXFORD FULFILLMENT CENTRE THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0026-2692 J9 MICROELECTR J JI Microelectron. J. PD NOV PY 1994 VL 25 IS 8 BP 757 EP 765 DI 10.1016/0026-2692(94)90139-2 PG 9 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology SC Engineering; Science & Technology - Other Topics GA QB540 UT WOS:A1994QB54000014 ER PT J AU DIAZ, A LACKS, SA LOPEZ, P AF DIAZ, A LACKS, SA LOPEZ, P TI MULTIPLE ROLES FOR DNA-POLYMERASE-I IN ESTABLISHMENT AND REPLICATION OF THE PROMISCUOUS PLASMID PLS1 SO MOLECULAR MICROBIOLOGY LA English DT Article ID STREPTOCOCCUS-PNEUMONIAE; ESCHERICHIA-COLI; POLA GENE; BACILLUS-SUBTILIS; EXONUCLEASE ACTIVITY; THERMUS-AQUATICUS; TRANSFORMATION; INITIATION; EXPRESSION; CLONING AB The polymerase activity of DNA polymerase I is important for the establishment of the pLS1 replicon by reconstitutive assembly in Streptococcus pneumoniae after uptake of exogenous pLS1 plasmid DNA. In polA mutants lacking the polymerase domain, such establishment was reduced at least 10-fold in frequency. Chromosomally facilitated establishment of pLS1-based plasmids carrying DNA homologous to the host chromosome was not so affected. However, both types of plasmid transfer gave mostly small colonies on initial selection, which was indicative of a defect in replication and filling of the plasmid pool. Once established, the pLS1-based plasmids replicated in polA mutants, but they showed segregational instability. This defect was not observed in strains with the wild-type enzyme or in an S. pneumoniae strain that encodes the polymerase and exonuclease domains of the enzyme on separate fragments. The role of DNA polymerase I in stably maintaining the plasmids depends on its polymerizing function in three separate steps of rolling-circle replication, as indicated by the accumulation of different replication intermediate forms in polA mutants. Furthermore, examination of the segregational stability of the pLS1 replicon in an Escherichia coli mutant system indicated that both the polymerase and the 5'-to-3' exonuclease activities of DNA polymerase I function in plasmid replication. C1 CSIC, CTR INVEST BIOL, E-28006 MADRID, SPAIN. BROOKHAVEN NATL LAB, DEPT BIOL, UPTON, NY 11973 USA. RI Lopez Garcia, Paloma/L-1583-2014 OI Lopez Garcia, Paloma/0000-0001-8755-8952 FU NIAID NIH HHS [AI14885] NR 35 TC 16 Z9 16 U1 0 U2 0 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0950-382X EI 1365-2958 J9 MOL MICROBIOL JI Mol. Microbiol. PD NOV PY 1994 VL 14 IS 4 BP 773 EP 783 DI 10.1111/j.1365-2958.1994.tb01314.x PG 11 WC Biochemistry & Molecular Biology; Microbiology SC Biochemistry & Molecular Biology; Microbiology GA PU230 UT WOS:A1994PU23000016 PM 7891563 ER PT J AU SPERBER, KR HAMEED, S POTTER, GL BOYLE, JS AF SPERBER, KR HAMEED, S POTTER, GL BOYLE, JS TI SIMULATION OF THE NORTHERN SUMMER MONSOON IN THE ECMWF MODEL - SENSITIVITY TO HORIZONTAL RESOLUTION SO MONTHLY WEATHER REVIEW LA English DT Article ID EUROPEAN-CENTER; FORECASTS; CLIMATE; PARAMETERIZATION; PARAMETRIZATION; PRECIPITATION; CIRCULATION; RADIATION; ONSET AB The ability of the ECMWF model (cycle 33) to simulate the Indian and East Asian summer monsoons is evaluated at four different horizontal resolutions: T21, T42, T63, and T106. Generally, with respect to the large-scale features of the circulation, the largest differences among the simulations occur at T42 relative to T21. However, on regional scales, important differences among the high-frequency temporal variability serve as a further critical test of the model's ability to simulate the monsoon. T106 best captures both the spatial and temporal characteristics of the Indian and East Asian monsoons, whereas T42 fails to correctly simulate the sequence and development of synoptic-scale milestones that characterize the monsoon flow. In particular, T106 is superior at simulating the development and migration of the monsoon trough over the Bay of Bengal. In the T42 simulation, the development of the monsoon occurs one month earlier than typically observed. At this time the trough is incorrectly located adjacent to the east coast of India, which results in an underestimate of precipitation over the Burma-Thailand region. This early establishment of the monsoon trough affects the evolution of the East Asian monsoon and yields excessive preseason rainfall over the Mei-yu region. EOF analysis of precipitation over China indicates that T106 best simulates the Mei-yu mode of variability, which is associated with an oscillation of the rainband that gives rise to periods of enhanced rainfall over the Yangtze River valley. The coarse resolution of T21 precludes simulation of the aforementioned regional-scale monsoon flows. C1 SUNY STONY BROOK,INST TERR & PLANETARY ATMOSPHERES,STONY BROOK,NY 11794. RP SPERBER, KR (reprint author), LAWRENCE LIVERMORE NATL LAB,PCMDI,MAIL STOP L-264,POB 808,LIVERMORE,CA 94550, USA. RI Sperber, Kenneth/H-2333-2012 NR 43 TC 92 Z9 97 U1 0 U2 3 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0027-0644 J9 MON WEATHER REV JI Mon. Weather Rev. PD NOV PY 1994 VL 122 IS 11 BP 2461 EP 2481 DI 10.1175/1520-0493(1994)122<2461:SOTNSM>2.0.CO;2 PG 21 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA PM969 UT WOS:A1994PM96900004 ER PT J AU PICRAUX, T AF PICRAUX, T TI MEMBERSHIP DISTRIBUTION IN MATERIALS RESEARCH SOCIETIES SO MRS BULLETIN LA English DT Letter RP PICRAUX, T (reprint author), SANDIA NATL LABS,DEPT SEMICOND PHYS,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD NOV PY 1994 VL 19 IS 11 BP 6 EP 6 PG 1 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA PT894 UT WOS:A1994PT89400002 ER PT J AU SCHWARTZ, JL ROTMENSCH, J SUN, J AN, J XU, ZD YU, YJ HSIE, AW AF SCHWARTZ, JL ROTMENSCH, J SUN, J AN, J XU, ZD YU, YJ HSIE, AW TI MULTIPLEX POLYMERASE CHAIN REACTION-BASED DELETION ANALYSIS OF SPONTANEOUS, GAMMA-RAY-INDUCED AND ALPHA-INDUCED HPRT MUTANTS OF CHO-K1 CELLS SO MUTAGENESIS LA English DT Article ID IONIZING-RADIATION; HAMSTER-CELLS; X-RAY; MOLECULAR CHARACTERIZATION; INDUCED MUTATIONS; MAMMALIAN-CELLS; RADON; GENE; INDUCTION; PARTICLE AB Independent Chinese hamster ovary (CHO)-K1 cell mutants at the hypoxanthine-guanine phosphoribosyltransferase (hprt) locus were isolated from untreated, Co-60 gamma ray-and Bi-212 alpha-exposed cells and the genetic changes underlying the mutation determined by multiplex polymerase chain reaction (PCR)-based exon deletion analysis. In the 71 spontaneous mutants analyzed, 77.5% of the clones showed no change in exon number or size, 15.5% showed a loss of a single exon, 4.2% showed a loss of 2-8 exons, and 2.8% showed loss of all nine hprt exons (total gene deletion). Exposure to 6 Gy of gamma rays, which reduced survival levels to 10%, produced a significantly different deletion spectrum that was shifted toward deletions with 45% of the 20 mutants analyzed showing a loss of a single exon and 30% showing a loss of all nine exons. Exposure to 2 Gy alpha radiation from Bi-212, a Rn-220 daughter, a dose which also reduced survival levels to about 10%, resulted in a deletion spectrum similar to the gamma-ray spectrum in that more than 75% of the 49 mutants analyzed were deletions. The alpha spectrum, however, was significantly different from both the spontaneous and gamma spectra with 55.1% of the alpha mutants showing a loss of all nine exons, 10.2% showing loss of a single exon, and 14.3% showing loss of 2-8 exons. Thus, alpha-radiation appears to produce larger intragenic deletions than gamma radiation. The results suggest that intragenic deletion size should be considered when low- and high linear energy transfer (LET) mutation spectra are compared. C1 UNIV CHICAGO,DEPT OBSTET & GYNECOL,CHICAGO,IL 60637. UNIV TEXAS,MED BRANCH,DEPT PREVENT MED & COMMUNITY HLTH,GALVESTON,TX 77550. RP SCHWARTZ, JL (reprint author), ARGONNE NATL LAB,CTR MECHANIST BIOL & BIOTECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. FU NCI NIH HHS [CA56434] NR 22 TC 25 Z9 27 U1 0 U2 1 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0267-8357 J9 MUTAGENESIS JI Mutagenesis PD NOV PY 1994 VL 9 IS 6 BP 537 EP 540 DI 10.1093/mutage/9.6.537 PG 4 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA PU229 UT WOS:A1994PU22900007 PM 7854145 ER PT J AU SCHWARTZ, JL SEDITA, BA LAFFELY, N GRDINA, DJ AF SCHWARTZ, JL SEDITA, BA LAFFELY, N GRDINA, DJ TI CHROMOSOME TERMINAL DELETION FORMATION IN CHINESE-HAMSTER OVARY CELLS SO MUTATION RESEARCH-FUNDAMENTAL AND MOLECULAR MECHANISMS OF MUTAGENESIS LA English DT Article DE CHROMOSOME ABERRATION INDUCTION; DNA REPAIR MUTANTS; CHINESE HAMSTER OVARY CELLS; GAMMA RAYS; RESTRICTION ENZYMES ID DOUBLE-STRAND BREAKS; SISTER-CHROMATID EXCHANGES; RAY-SENSITIVE MUTANTS; DNA-DAMAGING AGENTS; RESTRICTION ENDONUCLEASES; XRS-5 CELLS; CHO MUTANT; REPAIR; CYCLE; LINE AB To investigate the fate of unrejoined DNA double-strand breaks, the frequency of Co-60 gamma-ray- and restriction-enzyme-induced terminal chromosome deletions, a marker of unrejoined breaks, was determined in CHO-K1 and in xrs-5 cells. The xrs-5 cell is a DNA double-strand break repair-deficient derivative of CHO-K1. Terminal deletion frequency was small in both CHO-K1 and xrs-5 cells when cells were irradiated or treated with restriction enzyme while in the G(1) phase of the cell cycle. In contrast, previous studies have shown that treatment of cells in G(2) leads to large deletion frequencies, especially in xrs-5 cells. Cell cycle analyses show large G(2) blocks in irradiated xrs-5 cells with only partial recovery over a 24-96-h period. These results suggest that most CHO cells with unrejoined breaks are blocked in G(2) and, therefore, do not contribute to chromosome mutation frequencies. The small frequencies of terminal deletions that are found in these cells may reflect either an inefficiency in the G(2) checkpoint mechanism or, perhaps, a modification of broken ends that allows passage through G(2). C1 UNIV CHICAGO,DEPT RADIAT & CELLULAR ONCOL,CHICAGO,IL 60637. RP SCHWARTZ, JL (reprint author), ARGONNE NATL LAB,CTR MECHANIST BIOL & BIOTECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. FU NCI NIH HHS [CA-37435] NR 24 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0027-5107 J9 MUTAT RES-FUND MOL M JI Mutat. Res.-Fundam. Mol. Mech. Mutagen. PD NOV 1 PY 1994 VL 311 IS 1 BP 125 EP 131 DI 10.1016/0027-5107(94)90080-9 PG 7 WC Biotechnology & Applied Microbiology; Genetics & Heredity; Toxicology SC Biotechnology & Applied Microbiology; Genetics & Heredity; Toxicology GA PN554 UT WOS:A1994PN55400014 PM 7526165 ER PT J AU LASZLO, P PETRAKIS, L AF LASZLO, P PETRAKIS, L TI OBSERVING AND WATCHING SO NEW JOURNAL OF CHEMISTRY LA English DT Editorial Material C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. RP LASZLO, P (reprint author), ECOLE POLYTECH,F-91128 PALAISEAU,FRANCE. NR 1 TC 0 Z9 0 U1 0 U2 0 PU GAUTHIER-VILLARS PI MONTROUGE PA DEPT UNIV PROFESSIONNEL REVUES SCIENTIFIQUES TECHNIQUE 11 RUE GOSSIN, F-92543 MONTROUGE, FRANCE SN 1144-0546 J9 NEW J CHEM JI New J. Chem. PD NOV PY 1994 VL 18 IS 11 BP 1135 EP 1137 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA PW916 UT WOS:A1994PW91600001 ER PT J AU AMTHOR, JS MITCHELL, RJ RUNION, GB ROGERS, HH PRIOR, SA WOOD, CW AF AMTHOR, JS MITCHELL, RJ RUNION, GB ROGERS, HH PRIOR, SA WOOD, CW TI ENERGY CONTENT, CONSTRUCTION COST AND PHYTOMASS ACCUMULATION OF GLYCINE-MAX (L) MERR AND SORGHUM-BICOLOR (L) MOENCH GROWN IN ELEVATED CO2 IN THE FIELD SO NEW PHYTOLOGIST LA English DT Article DE CARBON DIOXIDE; CONSTRUCTION COST; ENERGY CONTENT; GLYCINE MAX (SOYBEAN); SORGHUM BICOLOR (GRAIN SORGHUM) ID CARBON-DIOXIDE; RESPONSES; NITROGEN; RESPIRATION; ENRICHMENT; MAINTENANCE; LEAVES; PLANTS; YIELD; PHOTOSYNTHESIS AB Grain sorghum [Sorghum] bicolor (L.) Moench, a C-4 crop] and soybean [Glycine max (L.) Merr. cv. Stonewall, a C-3 crop] plants were grown in ambient (c. 360 mu l l(-1)) and twice-ambient (c. 720 mu l l(-1)) CO2 levels in open-top chambers in soil without root constriction. Plant dry mass, energy content, composition and construction cost (i.e. amount of carbohydrate required to synthesize a unit of plant dry mass) were assessed at the end of the growing season. Elevated CO2 (a) increased phytomass accumulation (kg per plant) in both species, (b) had little affect on energy concentration (MJ kg(-1) plant) but caused large increases in the amount of plant energy per ground area (MJ m(-2) ground), and (c) did not alter specific growth cost (kg carbohydrate kg(-1) plant growth) but greatly increased growth cost per ground area (kg carbohydrate m(-2) ground) because growth was enhanced. For soybean, twice-ambient CO2 resulted in a 50 % increase in the amount of nitrogen and energy in grain (seed plus pod) per ground area. This response to elevated CO2 has important implications for agricultural productivity during the next century because the rate of human population growth is exceeding the rate of increase of land used for agriculture so that future food demands can only be met by greater production per ground area. C1 LAWRENCE LIVERMORE NATL LAB,DIV GLOBAL CLIMATE RES,LIVERMORE,CA 94550. JOSEPH W JONES ECOL RES CTR,NEWTON,GA 31770. USDA ARS,NATL SOIL DYNAM LAB,AUBURN,AL 36831. AUBURN UNIV,DEPT AGRON & SOILS,AUBURN,AL 36849. RP AMTHOR, JS (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV HLTH & ECOL ASSESSMENT,L-256,POB 808,LIVERMORE,CA 94550, USA. RI Amthor, Jeffrey/F-2696-2016 OI Amthor, Jeffrey/0000-0002-1410-6100 NR 44 TC 44 Z9 47 U1 0 U2 7 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0028-646X J9 NEW PHYTOL JI New Phytol. PD NOV PY 1994 VL 128 IS 3 BP 443 EP 450 DI 10.1111/j.1469-8137.1994.tb02990.x PG 8 WC Plant Sciences SC Plant Sciences GA PX913 UT WOS:A1994PX91300007 ER PT J AU SIEVERS, J BASS, BR AF SIEVERS, J BASS, BR TI COMPARATIVE-ASSESSMENT OF PROJECT FALSIRE - RESULTS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT Joint IAEA/CSNI Specialists Meeting on Fracture Mechanics Verification by Large-Scale Testing CY OCT 26-29, 1992 CL OAK RIDGE, TN SP IAEA, CSNI AB The analysis results of the recently completed Phase I for the Project Fracture Analysis of Large Scale International Reference Experiments (FALSIRE) are summarized in a comparative manner. Thirty-nine analyses of the pressurized thermal shock experiments NKS-3 and NKS-4 from MPA-Stuttgart (FRG), PTSE-2 from ORNL (USA) and spinning cylinder SC-I and SC-II from AEA Technology (UK) were evaluated. Discussion of the results has focused on the discrepancies of the finite element results and on comparisons with the estimation scheme analyses. A set of quantities such as crack mouth opening (CMOD), strains, stresses, J-integral and constraint have been selected and compared for the different analyses to approximate the structural behaviour of the test specimens and the fracture behaviour of the cracks. A database of the results has been established. The influence of boundary conditions, approximation of material properties and calculational methods is shown in detail. The structure mechanics behaviour of the test specimens could be approximated well for the NKS experiments but not for PTSE-2. Most differences between the various analyses could be explained. In SC tests structural mechanics results could not be compared with experimental measures. The application of J(R) methodology to predict crack extension was partially successful in some cases (NKS experiments) but not in others (PTSE-2). The quality of fracture assessment is closely connected with the structural mechanics simulation. In all analyses with good structural mechanics approximation, the fracture prediction was reasonable. Fracture assessments based on CT-specimens overestimate stable crack growth in the case of NKS-4 and SC-I/II, because the crack resistance in the large-scale test specimens is greater than predicted by small specimens (e.g. CT-25). SC-I/II fracture results show that crack growth can be described quite well with the J-integral and the J(R)-curves of the large-scale test specimen. Therefore, future work has to be concentrated on extension of the J(R) methodology by a parameter which controls the geometry and load dependence of the crack resistance. This can only be achieved by close connection between numerical simulation and fracture mechanics testing. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP SIEVERS, J (reprint author), GESELL ANLAGEN & REAKTORSICHERHEIT MBH,SCHWERTNERGASSE 1,W-5000 COLOGNE 1,GERMANY. NR 7 TC 2 Z9 2 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD NOV PY 1994 VL 152 IS 1-3 BP 19 EP 37 DI 10.1016/0029-5493(94)90071-X PG 19 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PX054 UT WOS:A1994PX05400004 ER PT J AU POOLE, AB CLINARD, JA BATTISTE, RL HENDRICH, WR AF POOLE, AB CLINARD, JA BATTISTE, RL HENDRICH, WR TI FRACTURE-MECHANICS AND FULL-SCALE PIPE BREAK TESTING FOR THE DEPARTMENT-OF-ENERGY NEW PRODUCTION REACTOR HEAVY-WATER REACTOR SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT Joint IAEA/CSNI Specialists Meeting on Fracture Mechanics Verification by Large-Scale Testing CY OCT 26-29, 1992 CL OAK RIDGE, TN SP IAEA, CSNI AB Oak Ridge National Laboratory (ORNL) has completed a major task for the US Department of Energy (DOE) in the demonstration that the primary piping of the proposed new production reactor-heavy water reactor (NPR-HWR), with its relatively moderate temperature and pressure, should not suffer an instantaneous double-ended guillotine break (DEGB) under design basis loadings and conditions. The growth of possible small pre-existing defects in the piping wall was estimated over a plant life of 60 years. This worst-case flaw was then evaluated using fracture mechanics methods. It was calculated that this worst-case flaw would increase in size by at least 14 times before pipe instability during a safe shutdown earthquake (SSE) would even begin to be possible. The approach to showing the improbability of an instantaneous DEGB for HWR primary piping required a major facility (pipe impact test facility, PITF) to apply all possible design loads, including an equivalent major earthquake (called the SSE earthquake). The facility was designed and built at ORNL in 6 months. The test article was 6.1 m long, 406 mm diameter, 13 mm thick pipe of stainless steel 316LN material that was fabricated to exacting standards and inspections following the nuclear industry standard practices. A flaw was machined and fatigued into the pipe at a tungsten inert gas (TIG) butt weld (ER316L weld wire) as an initial condition. The flaw-crack was sized to be beyond the worst-case flaw that HWR piping could see in 60 years of service-if all leak detection systems and if all crack inspection systems failed to notice the flaw's existence. Starting October 1991, the first test article was subjected to considerable overloadings. The pipe was impacted 104 times at levels equal to and well beyond the SSE loadings. In addition, over 560 000 fatigue cycles and numerous purposeful static overloads were applied in order to extend the flaw to establish the data necessary to confirm fracture mechanics theories, and more importantly, to demonstrate simply that instantaneous DEGB is highly improbable for the relatively moderate energy system. RP POOLE, AB (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 3 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 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD NOV PY 1994 VL 152 IS 1-3 BP 57 EP 65 DI 10.1016/0029-5493(94)90073-6 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PX054 UT WOS:A1994PX05400006 ER PT J AU WATKINS, JC STEELE, R DEWALL, KG WEIDENHAMER, GH ROTHBERG, OO AF WATKINS, JC STEELE, R DEWALL, KG WEIDENHAMER, GH ROTHBERG, OO TI NRC TEST-RESULTS AND OPERATIONS EXPERIENCE PROVIDE INSIGHTS FOR A NEW GATE VALVE STEM FORCE CORRELATION SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB The Idaho National Engineering Laboratory (INEL) is performing research in support of the efforts of the U.S. Nuclear Regulatory Commission (NRC) regarding the ability of motor-operated valves (MOVs) to perform their design basis function, usually to close against specified flow and pressure loads. Before 1979, the nuclear industry was not aware that they had major problems with their MOVs. However, the Three Mile Island (TMI) accident revealed the seriousness of this issue when the failure of a PORV block valve (a motor-operated gate valve) contributed to the severity of the accident. The inability of the auxiliary feedwater gate valves at Davis-Besse to reopen after they were inadvertently closed in 1985 further confirmed the seriousness of this issue. This paper presents the results of testing sponsored by the NRC to assess valve and motor operator performance under varying pressure and fluid conditions. This effort included an examination of the methods used by the industry to predict the required stem force of a valve, and research to provide guidelines for the extrapolation of in situ test results to design basis conditions. Years ago, when most of these valves were originally installed, the industry used a set of equations to determine analytically that the valves' motor-operators were large enough and the control switches were set high enough to close the valves at their design basis conditions. Our research has identified several inconsistencies with the industry's existing gate valve stem force equation and has challenged the overly simplistic assumptions inherent in its use. This paper discusses the development of the INEL correlation, which serves as the basis for a method to bound the stem force necessary to close flexwedge gate valves whose operational characteristics have been shown to be predictable. As utilities undertake to provide assurance of their valves' operability, this ability to predict analytically the required stem force is especially important for valves that cannot be tested at design basis conditions. For such valves, the results of tests conducted at less severe conditions can be used with the INEL correlation to make the necessary prediction. C1 USNRC TECH MONITORS,WASHINGTON,DC. RP WATKINS, JC (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 2 TC 0 Z9 0 U1 1 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD NOV PY 1994 VL 152 IS 1-3 BP 67 EP 78 DI 10.1016/0029-5493(94)90074-4 PG 12 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PX054 UT WOS:A1994PX05400007 ER PT J AU TANG, Y AF TANG, Y TI ROCKING RESPONSE OF TANKS CONTAINING 2 LIQUIDS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article ID STORAGE TANKS AB A study of the dynamic response of upright circular cylindrical liquid storage tanks containing two different liquids under a rocking base motion with an arbitrary temporal variation is presented. Only rigid tanks were studied. The response quantities examined include the hydrodynamic pressure, the sloshing wave height and associated frequencies, and the base shear and moments. Each of these response quantities is expressed as the sum of the so-called impulsive component and convective component. Unlike the case of tanks containing one liquid, in which the response is controlled by one parameter, the height-to-radius ratio, the response of tanks containing two different liquids is controlled by three parameters: the height-to-radius ratio and the mass density ratio and height ratio of the two liquids. The interrelationship of the responses of the tank-liquid system to rocking and lateral base excitations is established by examining numerical results extensively. It is found that some of the response quantities for a tank-liquid system under a rocking base motion can be determined from the corresponding response quantities for an identical tank under a horizontal base motion. RP TANG, Y (reprint author), ARGONNE NATL LAB,DIV REACTOR ENGN,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 10 TC 1 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD NOV PY 1994 VL 152 IS 1-3 BP 103 EP 115 DI 10.1016/0029-5493(94)90077-9 PG 13 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PX054 UT WOS:A1994PX05400010 ER PT J AU GALYEAN, WJ KELLY, DL SCHROEDER, JA AUFLICK, LJ BLACKMAN, HS GERTMAN, DI HANLEY, LN AF GALYEAN, WJ KELLY, DL SCHROEDER, JA AUFLICK, LJ BLACKMAN, HS GERTMAN, DI HANLEY, LN TI INTERSYSTEM LOCA RISK ASSESSMENT - METHODOLOGY AND RESULTS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB The United States Nuclear Regulatory Commission is sponsoring a research program to develop an improved understanding of the human factors, hardware and accident consequence issues that dominate the risk from an intersystem loss-of-coolant accident (ISLOCA) at a nuclear power plant. To accomplish the goals of this program, a mehtodology has been developed for estimating ISLOCA core damage frequency and risk. The steps in this methodology are briefly described, along with the results obtained from an application of the methodology at three pressurized water reactors. Also included are the results of a screening study of boiling water reactors. C1 LOCKHEED IDAHO TECHNOL CORP,INEL,IDAHO FALLS,ID 83415. NR 17 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 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD NOV PY 1994 VL 152 IS 1-3 BP 159 EP 174 DI 10.1016/0029-5493(94)90082-5 PG 16 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PX054 UT WOS:A1994PX05400015 ER PT J AU LARSON, TK OH, CH CHAPMAN, JC AF LARSON, TK OH, CH CHAPMAN, JC TI FLOODING IN A THIN RECTANGULAR SLIT GEOMETRY REPRESENTATIVE OF ATR FUEL ASSEMBLY SIDE-PLATE FLOW CHANNELS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB Air-water counter-current flow limit experiments were conducted in thin rectangular channels at atmospheric pressure. The parameters were: narrow channel width, either 1.1 mm or 2.2 mm; inlet water temperature, ranging from 294 K to 330 K; channel surface condition, either clean aluminum, aluminum oxide, or acrylic; location and geometry of the air inlet; method of forcing air through the channel; and liquid head above the channel. Experimental results for each set of parameters can be linearly correlated using the square root of the non-dimensional superficial velocities. Channel surface wetting and location and geometry of the air injection had the greatest effect. Narrow channel width, water temperature, method used to force air through the channel, and liquid head above the channel had little effect on the flooding characteristics. RP LARSON, TK (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,NUCL SAFETY,POB 1625,IDAHO FALLS,ID 83415, USA. NR 6 TC 7 Z9 8 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD NOV PY 1994 VL 152 IS 1-3 BP 277 EP 285 DI 10.1016/0029-5493(94)90092-2 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PX054 UT WOS:A1994PX05400025 ER PT J AU CARBAJO, JJ AF CARBAJO, JJ TI MELCOR SENSITIVITY STUDIES FOR A LOW-PRESSURE, SHORT-TERM STATION BLACKOUT AT THE PEACH-BOTTOM PLANT SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article ID SEVERE ACCIDENT; DEBRIS AB This paper summarizes the results of analyses performed to assess the effect of a variety of design parameters and operational procedures on a station blackout severe accident at the Peach Bottom Atomic Power Station. The severe-accident MELCOR code, version 1.8.1 was used in these analyses. The following sensitivity studies were completed: effect of the automatic depressurization system actuation timing on the accident progression; effect of fuel and cladding porosities on vessel failure and containment failure times; effect of several parameters on the amount of in-vessel steel ejected into the cavity after vessel failure; effect of different parameters on vessel penetration failure time; vessel failure timing; and lower plenum shroud and core shroud temperatures. These sensitivity studies provided valuable insights into the MELCOR code behavior and into the progression of this severe accident. The most significant results are: (a) the optimum steam cooling of the core is accomplished when the automatic depressurization system is actuated when the core water level is at one-third of the active core height, delaying vessel failure by minutes and containment failure by hours, (b) vessel failure is significantly delayed (by 2 h) when lower-plenum debris quenching is included in the model, and (c) the core shroud melts during this transient. RP CARBAJO, JJ (reprint author), OAK RIDGE NATL LAB,DIV ENGN TECHNOL,OAK RIDGE,TN 37831, USA. NR 27 TC 9 Z9 9 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD NOV PY 1994 VL 152 IS 1-3 BP 287 EP 317 DI 10.1016/0029-5493(94)90093-0 PG 31 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PX054 UT WOS:A1994PX05400026 ER PT J AU DEPIANTE, EV AF DEPIANTE, EV TI STABILITY ANALYSIS OF A LIQUID-METAL REACTOR AND ITS PRIMARY HEAT-TRANSPORT SYSTEM SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB Part of the reactor design process is the assessment of the impact of different design changes on pre-defined performance criteria including stability of the reactor system under different conditions. This work focuses on the stability analysis of a combined liquid-metal reactor and primary heat transport system where system parameters are free to vary, with particular interest in low reactor power, low reactor coolant flow conditions. Such conditions might be encountered, for example, after a loss of flow without scram in some passively safe reactor designs. Linear-stability-analysis-based methods are developed to find the stability regions, stability boundary surface in system parameter space, and frequency of oscillation at oscillatory instability boundaries. Models are developed for the reactor, detailed thermal hydraulic reactivity feedback associated with coolant outlet and inlet temperatures, decay heat and primary system. The developed stability analysis tools are applied to the system model. The system parameters include integral reactivity parameters, decay heat, primary system mass, coolant flow and natural circulation flow. The resulting stability boundary surface and its associated frequency of oscillation surface in multidimensional system parameter space show the effect of system parameter changes. By adopting model parameters from liquid-metal reactor designs, a stability prediction procedure is illustrated. RP DEPIANTE, EV (reprint author), ARGONNE NATL LAB,DIV REACTOR ANAL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 19 TC 2 Z9 2 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD NOV PY 1994 VL 152 IS 1-3 BP 361 EP 377 DI 10.1016/0029-5493(94)90097-3 PG 17 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PX054 UT WOS:A1994PX05400030 ER PT J AU WULFF, W AF WULFF, W TI INTEGRAL METHODS FOR SIMULATING TRANSIENT CONDUCTION IN NUCLEAR-REACTOR COMPONENTS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB Integral methods for predicting thermal conduction in complex engineering systems, such as nuclear power plants, are presented. The methods serve to substitute ordinary for partial differential equations. They provide simple formulations that are easy to interpret, easy to integrate, and that yield reliable predictions of thermal response time, transient temperature and heat flux. RP WULFF, W (reprint author), BROOKHAVEN NATL LAB,DEPT ADV TECHNOL,UPTON,NY 11973, USA. NR 21 TC 3 Z9 3 U1 1 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD NOV PY 1994 VL 151 IS 1 BP 113 EP 129 DI 10.1016/0029-5493(94)90037-X PG 17 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PQ832 UT WOS:A1994PQ83200010 ER PT J AU ROHATGI, US MALLEN, AN CHENG, HS WULFF, W AF ROHATGI, US MALLEN, AN CHENG, HS WULFF, W TI VALIDATION OF THE ENGINEERING-PLANT ANALYZER METHODOLOGY WITH PEACH-BOTTOM-2 STABILITY-TESTS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article ID BOILING WATER-REACTORS; NONLINEAR DYNAMICS AB The Engineering Plant Analyzer (EPA) had been developed in 1984 at Brookhaven National Laboratory to simulate plant transients in boiling water reactors (BWR). Recently, the EPA with its High-Speed Interactive Plant Analyzer code for BWRs (HIPA-BWR) simulated for the first time oscillatory transients with large, non-linear power and flow amplitudes; transients which are centered around the March 9, 1988 instability at the LaSalle-2 BWR power plant. The EPA's capability to simulate oscillatory transients has been demonstrated first by comparing simulation results with LaSalle-2 plant data (Wulff et al., NUREG/CR-5816, BNL-NUREG-52312, Brookhaven National Laboratory, 1992). This paper presents an EPA assessment on the basis of the Peach Bottom 2 instability tests (Carmichael and Niemi, EPRI NP-564, Electric Power Research Institute, Pale Alto, CA, 1978). This assessment of the EPA appears to constitute the first validation of a time-domain reactor systems code on the basis of frequency-domain criteria, namely power spectral density, gain and phase shift of the pressure-to-power transfer function. The reactor system pressure was disturbed in the Peach Bottom 2 power plant tests, and in their EPA simulation, by a pseudo-random, binary sequence signal. The data comparison revealed that the EPA predicted for Peach Bottom tests PT1, PT2, and PT4 the gain of the power-to-pressure transfer function with the biases and standard deviations of (-10 +/- 28)%, (-1 +/- 40)% and (+28 +/- 52)%, respectively. The respective frequencies at the peak gains were predicted with the errors of +6%, +3%, and -28%. The differences between the predicted and the measured phase shift increased with increasing frequency, but stayed within the margin of experimental uncertainty. The code assessment presented here is valid only for small-amplitude oscillations, but it encompasses neutron kinetics, fuel thermal response, coolant thermohydraulics and control-system dynamics. To our knowledge, this assessment of the time-domain HIPA-BWR code by frequency-domain methods and spectral plant data demonstrates for the first time the feasibility of such an assessment. RP ROHATGI, US (reprint author), BROOKHAVEN NATL LAB,DEPT NUCL ENERGY,BLDG 475B,UPTON,NY 11973, USA. NR 24 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 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD NOV PY 1994 VL 151 IS 1 BP 145 EP 156 DI 10.1016/0029-5493(94)90039-6 PG 12 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PQ832 UT WOS:A1994PQ83200012 ER PT J AU YARBROUGH, LW AF YARBROUGH, LW TI GETTING A REMOTE GRIP ON DEFENSE WASTE - A SURVEY OF THE US-DOES ROBOTICS TECHNOLOGY DEVELOPMENT PROGRAM SO NUCLEAR ENGINEERING INTERNATIONAL LA English DT Article RP YARBROUGH, LW (reprint author), US DOE,ROBOT TECHNOL DEV PROGRAM,TREVION 11 SUITE 400,WASHINGTON,DC 20585, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU REED BUSINESS PUBLISHING LTD PI SUTTON PA QUADRANT HOUSE THE QUADRANT, SUTTON, SURREY, ENGLAND SM2 5AS SN 0029-5507 J9 NUCL ENG INT JI Nucl. Eng. Int. PD NOV PY 1994 VL 39 IS 484 BP 24 EP & PG 0 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PQ560 UT WOS:A1994PQ56000010 ER PT J AU ARMSTRONG, RJ DARROW, DS AF ARMSTRONG, RJ DARROW, DS TI OBSERVATION OF CROSS-FIELD PLASMA ROTATION IN CDX-U USING A SIMPLE MACH PROBE SO NUCLEAR FUSION LA English DT Letter ID SCRAPE-OFF LAYER; MAGNETIZED PLASMAS; LANGMUIR PROBE; EDGE; DITE; TDEV AB Evidence is presented that a simple, relatively nonperturbing Mach probe can measure plasma flow across a magnetic field. Measurements of poloidal flow in the CDX-U plasma made by a simply constructed Mach probe are presented. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ. RP ARMSTRONG, RJ (reprint author), UNIV TROMSO,INST MATH & PHYS SCI,TROMSO,NORWAY. NR 21 TC 9 Z9 10 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD NOV PY 1994 VL 34 IS 11 BP 1532 EP 1537 DI 10.1088/0029-5515/34/11/I12 PG 6 WC Physics, Fluids & Plasmas SC Physics GA PW541 UT WOS:A1994PW54100012 ER PT J AU COULTER, KP GILMAN, R HOLT, RJ ISAEVA, LG KINNEY, ER KOWALCZYK, RS MISHNEY, SI NAPOLITANO, J NIKOLENKO, DM POPOV, SG POTTERVELD, DH RACHEK, IA SUKHANOV, AV TEMNYKH, AB TOPORKOV, DK TSENTALOVICH, EP WOJTSEKHOWSKI, BB YOUNG, L ZGHICHE, A AF COULTER, KP GILMAN, R HOLT, RJ ISAEVA, LG KINNEY, ER KOWALCZYK, RS MISHNEY, SI NAPOLITANO, J NIKOLENKO, DM POPOV, SG POTTERVELD, DH RACHEK, IA SUKHANOV, AV TEMNYKH, AB TOPORKOV, DK TSENTALOVICH, EP WOJTSEKHOWSKI, BB YOUNG, L ZGHICHE, A TI AN ACTIVE STORAGE CELL FOR A POLARIZED GAS INTERNAL TARGET SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID RING AB The first experiment using an active storage cell for polarized atoms to increase the target thickness in an electron storage ring has been performed at the VEPP-3 facility. A clam-shell storage cell, which is opened while injecting electrons into the storage ring and closed during operation, was used to increase the target thickness viewed by the detector system. The average tensor polarization of the target was found to be p(zz) = 0.59 +/- 0.14 and the figure of merit was increased by more than a factor of thirty in comparison with a direct jet thickness. The measured target thickness and polarization are in a good agreement with the expected values. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. BUDKER NUCL PHYS INST,NOVOSIBIRSK 630090,RUSSIA. RI Holt, Roy/E-5803-2011 NR 24 TC 5 Z9 5 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 NOV 1 PY 1994 VL 350 IS 3 BP 423 EP 429 DI 10.1016/0168-9002(94)91243-2 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PP217 UT WOS:A1994PP21700004 ER PT J AU MERCER, DJ MIKOLAS, D YURKON, J AUSTIN, SM BAZIN, D GAFF, S KASHY, E KATARIA, D WINFIELD, JS BETTS, RR HENDERSON, DJ HALLIN, AL LIU, M WOLFS, FLH AF MERCER, DJ MIKOLAS, D YURKON, J AUSTIN, SM BAZIN, D GAFF, S KASHY, E KATARIA, D WINFIELD, JS BETTS, RR HENDERSON, DJ HALLIN, AL LIU, M WOLFS, FLH TI A LARGE SOLID-ANGLE ARRAY FOR HEAVY-IONS FROM APEX SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID ELECTRON-SPECTROSCOPY; COLLISIONS; POSITRON; DETECTORS; CHAMBERS; PEAKS AB A large solid-angle array of Low Pressure Multi-Wire Proportional Counters (LPMWPCs) has been constructed as part of the ATLAS Positron Experiment (APEX). Eight three-element trapezoidal counters span 360-degrees in phi and 20-68-degrees in laboratory theta. Angle sensitivity in theta is provided by a transmission-line delay cathode, while the 24-fold segmentation provides angle sensitivity in phi. Details are given on the design of the counters and associated hardware. Performance of the counters is described, based on tests with scattered heavy ions ranging from Ni-58 to U-238. C1 MICHIGAN STATE UNIV,NATL SUPERCONDUCTING CYCLOTRON LAB,E LANSING,MI 48824. ARGONNE NATL LAB,ARGONNE,IL 60439. QUEENS UNIV,KINGSTON K7L 3N6,ONTARIO,CANADA. UNIV ROCHESTER,NUCL STRUCT RES LAB,ROCHESTER,NY 14627. RI Hallin, Aksel/H-5881-2011 NR 23 TC 6 Z9 6 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 1 PY 1994 VL 350 IS 3 BP 491 EP 502 DI 10.1016/0168-9002(94)91249-1 PG 12 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PP217 UT WOS:A1994PP21700010 ER PT J AU KOEHLER, PE AF KOEHLER, PE TI A DETERMINATION OF THE ENERGY RESOLUTION OF LANSCE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID CROSS-SECTION; NEUTRON AB The energy resolution of the white neutron source at the Manuel Lujan, Jr. Neutron Scattering Center (LANSCE) was determined in the energy range from approximately 1 eV to 100 keV by comparing measurements with resolution-broadened theoretical resonance shapes. It was found that the LANSCE resolution function could be well described by a skewed Gaussian having a width in agreement with the sum of the known contributions from the incident proton pulse width, the moderation width, the channel width, and Doppler broadening. In addition, to obtain a good fit to the data it was necessary to use an energy-dependent skew parameter. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. OI Koehler, Paul/0000-0002-6717-0771 NR 9 TC 5 Z9 5 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 NOV 1 PY 1994 VL 350 IS 3 BP 511 EP 516 DI 10.1016/0168-9002(94)91251-3 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PP217 UT WOS:A1994PP21700012 ER PT J AU TOELLNER, TS STURHAHN, W ALP, EE MONTANO, PA RAMANATHAN, M AF TOELLNER, TS STURHAHN, W ALP, EE MONTANO, PA RAMANATHAN, M TI AVALANCHE PHOTODIODES AS LARGE DYNAMIC-RANGE DETECTORS FOR SYNCHROTRON-RADIATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB We investigated silicon-based avalanche photodiodes (APDs) as X-ray detectors in terms of their linearity, maximum counting rates, and dynamic range with 8.4 keV synchrotron radiation. Measurements resulted in counting rates that extend from the APD's noise level of 10(-2) Hz to saturation counting rates in excess of 10(8) Hz. In addition, by monitoring the APD's noise level and photon counting efficiency between synchrotron bursts, we demonstrate nine orders of magnitude dynamic range. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP TOELLNER, TS (reprint author), ARGONNE NATL LAB,ADV PHOTON SOURCE,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 3 TC 21 Z9 21 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 1 PY 1994 VL 350 IS 3 BP 595 EP 600 DI 10.1016/0168-9002(94)91262-9 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PP217 UT WOS:A1994PP21700023 ER PT J AU SMITH, GC COX, DE JEPHCOAT, AP AF SMITH, GC COX, DE JEPHCOAT, AP TI X-RAY POSITION RESOLUTION IN PROPORTIONAL CHAMBERS IN THE REGION OF 100 MU (FWHM) ABOVE THE XENON K-EDGE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Letter AB A brief discussion is presented of the X-ray absorption process in xenon above its K-edge of 34.6 keV. Experimental measurements from a one-dimensional proportional chamber, operating with a gas mixture of Xe/10%CO2, show that position resolution in the region of 100 mum FWHM can be achieved for X-rays with energy just above the K-edge. C1 UNIV OXFORD,DEPT EARTH SCI,OXFORD OX1 3PR,ENGLAND. RP SMITH, GC (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 1 PY 1994 VL 350 IS 3 BP 621 EP 623 DI 10.1016/0168-9002(94)91267-X PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PP217 UT WOS:A1994PP21700028 ER PT J AU MA, Z CALAWAY, WF PELLIN, MJ VONNAGYFELSOBUKI, EI AF MA, Z CALAWAY, WF PELLIN, MJ VONNAGYFELSOBUKI, EI TI KINETIC-ENERGY DISTRIBUTIONS OF SPUTTERED INDIUM ATOMS AND CLUSTERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID DIATOMIC-MOLECULES; MASS-SPECTROMETRY; METAL-CLUSTERS; IONIZATION; EMISSION; ALUMINUM; SILVER; COPPER; MODEL; IONS AB The kinetic energy distributions of neutral indium atoms and clusters through In, were measured during the sputtering of a polycrystalline indium surface by normally incident similar to 4 keV Ar+ ions using laser post-ionization in combination with time-of-flight mass spectrometry. Data on In, clusters represent the largest and heaviest sputtered neutral cluster for which kinetic energy distribution data are available. The slopes of the high energy tails for the various cluster kinetic energy distributions are nearly equal to each other and to the values found for copper and aluminum cluster distributions previously measured in this laboratory. The energies at which the distributions reach a maximum decrease from a value of 1.6 eV for In atoms to a value of 1.1 eV for In-g. The possible influence of photofragmentation and unimolecular fragmentation on the kinetic energy distributions was investigated and found not to significantly affect the measurements. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. UNIV NEWCASTLE,DEPT CHEM,CALLAGHAN,NSW 2283,AUSTRALIA. RI Pellin, Michael/B-5897-2008 OI Pellin, Michael/0000-0002-8149-9768 NR 31 TC 16 Z9 16 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD NOV PY 1994 VL 94 IS 3 BP 197 EP 202 DI 10.1016/0168-583X(94)95354-6 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PR789 UT WOS:A1994PR78900003 ER PT J AU DROSG, M DRAKE, DM MASARIK, J AF DROSG, M DRAKE, DM MASARIK, J TI CALIBRATION OF A LI-GLASS DETECTOR FOR NEUTRON ENERGIES ABOVE 50-KEV BY THE H-1(T,N) HE-3-REACTION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article AB The low energy group of the neutron source H-1(t,n)He-3 was used to generate absolute fluxes of monoenergetic neutrons in the tens of keV range. This way the absolute counting efficiency of a Li-glass detector was determined in this rather difficult energy range in a straightforward way. Whereas the efficiency for neutrons with energies below about 2.3 MeV reflects the Li-6(n,t)He-4 cross section, contributions of (n,n'gamma) reactions which are strongly dependent on the pulse-height threshold are observed above that energy. The use of compiled Li-6(n,t)He-4 cross sections to predict the efficiency is discussed. C1 MAX PLANCK INST CHEM,D-55122 MAINZ,GERMANY. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP DROSG, M (reprint author), UNIV VIENNA,INST EXPTL PHYS,STRUDLHOFGASSE 4,A-1090 VIENNA,AUSTRIA. NR 16 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD NOV PY 1994 VL 94 IS 3 BP 319 EP 324 DI 10.1016/0168-583X(94)95371-6 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PR789 UT WOS:A1994PR78900020 ER PT J AU MCFEE, AF ROBERTSON, SD WASHBURN, LC AF MCFEE, AF ROBERTSON, SD WASHBURN, LC TI CYTOGENETIC DAMAGE IN MARROW-CELLS OF MICE AFTER INJECTIONS OF YTTRIUM-90-LABELED MONOCLONAL-ANTIBODY SO NUCLEAR MEDICINE AND BIOLOGY LA English DT Article ID SISTER-CHROMATID EXCHANGES; COLORECTAL-CARCINOMA; MOUSE; MICRONUCLEUS; RADIATION; INDUCTION; RADIOIMMUNOTHERAPY; LYMPHOCYTES; CO17-1A; AGENT AB Chromosome aberrations, micronuclei and sister-chromatid exchanges were quantified in marrow cells of athymic nude and B6C3F1 mice at various times up to 14 days after injection of Y-90-labeled monoclonal antibody CO17-1A. Aberrations, predominantly of the chromatid type, were sharply elevated at 24 h post-injection then declined in a curvilinear fashion over the 14 days. Micronucleus numbers among polychromatic erythrocytes peaked 3-4 days after treatment, then declined exponentially but remained at higher than expected levels. Sister-chromatid exchanges were roughly double the control rate with no apparent relation to post-treatment time. RP MCFEE, AF (reprint author), OAK RIDGE INST SCI & EDUC,DIV MED SCI,POB 117,OAK RIDGE,TN 37831, USA. NR 17 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 0883-2897 J9 NUCL MED BIOL JI Nucl. Med. Biol. PD NOV PY 1994 VL 21 IS 8 BP 1109 EP 1114 DI 10.1016/0969-8051(94)90183-X PG 6 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA QD593 UT WOS:A1994QD59300011 PM 9234369 ER PT J AU KING, RC AF KING, RC TI A PRECISE MEASUREMENT OF THE LEFT-RIGHT ASYMMETRY OF Z BOSON PRODUCTION AT THE SLAC LINEAR COLLIDER SO NUCLEAR PHYSICS B LA English DT Article AB During the 1993 run of the SLC/SLD, the SLD recorded 49, 392 Z events produced by the collision of longitudinally polarized electrons on unpolarized positrons at a center-of-mass energy of 91.26 GeV. A Compton polarimeter measured to luminosity-weighted average polarization to be (63.0 +/- 1.1)%. A(LR) was measured to be 0.1628 +/- 0.0071(stat.) +/- 0.0028(syst.) which determines the effective weak mixing angle to be sin2THETA(W)eff = 0.2292 +/- 0.0009(stat.) +/- 0.0004(syst.). C1 STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. NR 21 TC 3 Z9 3 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 NOV PY 1994 SU 37B BP 23 EP 31 PG 9 WC Physics, Particles & Fields SC Physics GA PW333 UT WOS:A1994PW33300003 ER PT J AU ANLAUF, H DAHMEN, HD HIMMLER, A MANAKOS MANNEL, T OHL, T AF ANLAUF, H DAHMEN, HD HIMMLER, A MANAKOS MANNEL, T OHL, T TI WOPPER, VERSION-1.1 - A MONTE-CARLO EVENT GENERATOR FOR 4 FERMION PRODUCTION AT LEP-II AND BEYOND SO NUCLEAR PHYSICS B LA English DT Article ID SCATTERING AB We report on the status of the Monte Carlo event generator WOPPER. Version 1.1 of WOPPER describes four fermion production at LEP-II and beyond with leading logarithmic radiative corrections in the double W+/- pole approximation. These approximations are appropriate for almost all practical purposes, but the inclusion of these finite width effects and radiative corrections is nevertheless indispensable for LEP-II physics. C1 SLAC,THEORET PHYS,STANFORD,CA 94309. UNIV SIEGEN,D-57076 SIEGEN,GERMANY. TH DARMSTADT,D-64289 DARMSTADT,GERMANY. CERN,DIV THEORY,CH-1211 GENEVA 23,SWITZERLAND. NR 15 TC 1 Z9 1 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 NOV PY 1994 SU 37B BP 81 EP 86 PG 6 WC Physics, Particles & Fields SC Physics GA PW333 UT WOS:A1994PW33300010 ER PT J AU BRODSKY, SJ KRAMER, M ZERWAS, PM AF BRODSKY, SJ KRAMER, M ZERWAS, PM TI THE STRUCTURE FUNCTIONS OF THE PHOTON SO NUCLEAR PHYSICS B LA English DT Article ID DEEP INELASTIC-SCATTERING; QUANTUM CHROMODYNAMICS; SUM-RULE; ORDER AB We review the physics issues of the photon structure functions that can be studied at LEP200 and with e+e- linear colliders with energies up to 500 GeV. C1 STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. JOHANNES GUTENBERG UNIV,INST PHYS,D-55099 MAINZ,GERMANY. DESY,DEUTSCHES ELEKTR SYNCHROTRON,D-22603 HAMBURG,GERMANY. NR 46 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 NOV PY 1994 SU 37B BP 293 EP 302 DI 10.1016/0920-5632(94)90686-6 PG 10 WC Physics, Particles & Fields SC Physics GA PW333 UT WOS:A1994PW33300033 ER PT J AU ESTEP, RJ PRETTYMAN, TH SHEPPARD, GA AF ESTEP, RJ PRETTYMAN, TH SHEPPARD, GA TI TOMOGRAPHIC GAMMA SCANNING TO ASSAY HETEROGENEOUS RADIOACTIVE-WASTE SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article AB Current methods for the nondestructive assay of special nuclear materials (SNM) and transuranic (TRU) waste in 208-l drums can give assay errors of 100% or more when the drum matrix and/or radionuclide distribution is nonuniform. This problem is addressed by the development of the tomographic-gamma-scanner (TGS) method for assaying heterogeneous drummed SNM/TRU waste. The TGS method improves on the well-established segmented-gamma-scanner (SGS) method by preforming low-resolution tomographic emission and transmission scans on the drum, yielding coarse three-dimensional images of the matrix density and radionuclide distributions. The images are used to make accurate, point-to-point attentuation corrections. The TGS geometric counting efficiency is 60% that of a typical SGS device, allowing a TGS assay time of only 28 min/drum with a one-detector system. The TGS method may also be useful for nondestructive examination. Currently, TGS is the only practical method of imaging SNM in drums. RP ESTEP, RJ (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. OI Prettyman, Thomas/0000-0003-0072-2831 NR 9 TC 20 Z9 28 U1 0 U2 6 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD NOV PY 1994 VL 118 IS 3 BP 145 EP 152 PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PR640 UT WOS:A1994PR64000002 ER PT J AU LIU, HYB BRUGGER, RM AF LIU, HYB BRUGGER, RM TI CONCEPTUAL DESIGNS OF EPITHERMAL NEUTRON BEAMS FOR BORON NEUTRON-CAPTURE THERAPY FROM LOW-POWER REACTORS SO NUCLEAR TECHNOLOGY LA English DT Article DE BORON NEUTRON CAPTURE THERAPY; U-235 FISSION PLATE; SLAB REACTOR AB Convenient, economical epithermal neutron beams will be needed in the future for boron neutron capture therapy (BNCT). We studied two concepts for producing epithermal neutron beams with low-power reactors. The first design is a 100-kW reactor with a U-235 fission plate placed outside the reflector region, plus an Al/Al2O3 moderator assembly. The beam, which is directed forward, delivers a flux of epithermal neutrons of 0.8 x 10(9) n/cm2.s and a fast neutron dose of 4.4 x 10(-11) cGy.cm2/n(epi). The second design is based on a slab reactor plus a similar Al/Al2O3 moderator assembly. With an operating power of 50 kW, the beam has an intensity of 1.4 x 10(9) n/cm2.s and a fast neutron dose of 4.6 x 10(-11) cGy.cm2/n(epi); this beam also is directed forward. These epithermal neutron beams should be acceptable for BNCT; a treatment could be completed in approximately 1 h, and the fast neutron dose to the skin would not be the limiting dose. Such small reactors should be practicable in a hospital location. RP LIU, HYB (reprint author), BROOKHAVEN NATL LAB,DEPT MED,BORON NEUTRON CAPTURE THERAPY RES GRP,UPTON,NY 11973, USA. NR 15 TC 4 Z9 4 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD NOV PY 1994 VL 108 IS 2 BP 151 EP 156 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PP101 UT WOS:A1994PP10100001 ER PT J AU LESSING, PA HEAPS, RJ AF LESSING, PA HEAPS, RJ TI STRENGTH OF SILICON-CARBIDE LAYERS OF FUEL-PARTICLES FOR HIGH-TEMPERATURE GAS-COOLED REACTORS SO NUCLEAR TECHNOLOGY LA English DT Article DE SILICON CARBIDE; STRENGTH; FAILURE ORIGINS ID PYROLYTIC SIC COATINGS AB A fuel design being developed for the high-temperature gas-cooled reactor consists of microspheres (particles) of a very small kernel of dense, sintered, enriched 235UCO encapsulated by several layers of pyrolytic carbon and a layer of silicon carbide (SiC). The coated fuel particles are often called TRISO(R) particles. The SiC is derived via thermal decomposition of methyltrichlorosilane. This strong, dense layer is very important to the integrity of the particle and the retention of fission products. A fundamental understanding of failure mechanisms of unirradiated fuel particles is elucidated by measuring their failure rates when exposed to mechanical stresses. This was accomplished by compression testing of whole particles in two modes: (a) point loading and (b) dimple loading. Finite element stress modeling showed that point loading primarily exposed a small portion of the inner surface of the SiC layer to a maximum tensile stress. Stress analysis for the dimple loading showed that a significant area (inner and outer surface) of the SiC layer and a large volume of the SiC layer were stressed to near-maximum tensile levels. Various batches of archived particles were tested. Weibull methodology was used for analyses of failure statistics for groups of 500 particles. A scanning electron microscope was used for fractography, which identified critical flaws that were the likey fracture origins. The following is concluded from the strength tests. First, the dimple test yielded much lower strengths and different Weibull distribution curves than those resulting from the point-load test. This was attributed to a higher probability of finding flaws due to exposing more and different portions of the SiC layers to high stresses. Therefore, Weibull failure probabilities from the dimple test should give a more accurate prediction of in-service failures than point-load tests. The dimple test gave consistent and reproducible results. Second, fractography indicated that strengths were controlled by flaws, which were identified and categorized. Third, gold-colored spots were linked to large lenticular flaws oriented circumferentially in the SiC layer. These flaws were associated with diffuse iron impurities and silicon and carbon soot. The spots did not greatly affect the medium and high portions of the strength distribution because of their orientation to the tensile stresses. However, there was evidence that large gold spots were associated with a low-strength dog leg at low failure probabilities, and testing a minimum number of 1000 particle/batch is recommended to increase the confidence in fitting this portion of the probability plot. Fourth, compacting did not greatly affect the overall strength distribution of performance test fuel particles. Finally, burn-back and hydrofluoric acid etching procedures appear to accentuate the deleterious effect of some flaws. RP LESSING, PA (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 17 TC 6 Z9 6 U1 0 U2 2 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD NOV PY 1994 VL 108 IS 2 BP 207 EP 234 PG 28 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PP101 UT WOS:A1994PP10100006 ER PT J AU WU, CW HENDERSON, DL BENNETT, EF AF WU, CW HENDERSON, DL BENNETT, EF TI PRELIMINARY NEUTRONICS INVESTIGATION OF THE DELAYED NEUTRON NONDESTRUCTIVE ASSAY OF AN INTEGRAL FAST-REACTOR WASTE CANISTER SO NUCLEAR TECHNOLOGY LA English DT Article DE NONDESTRUCTIVE DELAYED NEUTRON ASSAY; NUCLEAR WASTE ASSAY; INTEGRAL FAST REACTOR WASTE CANISTER AB An innovative liquid-metal reactor, the Integral Fast Reactor (IFR), is being developed at Argonne National Laboratory. One characteristic of the IFR is the fuel cycle closure. Fissile material bred and fissionable material produced in the reactor are recycled back into the reactor. Waste generated during fuel reprocessing will be packaged into special waste canisters and will be shipped to a repository for final disposal. Prior to its removal from the facility, a measurement of the fissile content will be necessary as a part of an overall fissile material inventory accountability system. A particular form of nondestructive assay called delayed neutron nondestructive assay (DNNDA) is being developed to assist in the establishment of an accountability system. A preliminary neutronics investigation for the current DNNDA has been made to assist and verify the characteristics of the design from a neutronic aspect. A 10(11) n/s, 14-MeV neutron source would provide adequate counting statistics for fissile material at the milligram to gram level. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP WU, CW (reprint author), UNIV WISCONSIN,DEPT NUCL ENGN & ENGN PHYS,1500 JOHNSON DR,MADISON,WI 53706, USA. NR 9 TC 1 Z9 1 U1 0 U2 2 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD NOV PY 1994 VL 108 IS 2 BP 235 EP 255 PG 21 WC Nuclear Science & Technology SC Nuclear Science & Technology GA PP101 UT WOS:A1994PP10100007 ER PT J AU AMSLER, C AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T COOPER, A CRAMER, O CROWE, KM DIETZ, HP DOMBROWSKI, SV DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U SALK, J SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C AF AMSLER, C AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T COOPER, A CRAMER, O CROWE, KM DIETZ, HP DOMBROWSKI, SV DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U SALK, J SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C TI HIGH-STATISTICS ANALYSIS OF (P)OVER-BAR-P-]PI(0)PI(0)PI(0) AT REST SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT Conference HADRON 93 CY JUN 21-25, 1993 CL COMO, ITALY AB Antiproton-proton annihilation at rest into 3 pi(0) is analysed based on a data sample of about 500000 high-quality 3 pi(0) events. In this high-statistics Dalitz plot two structures in the region of pi(0) pi(0) invariant masses of about 1500 MeV show up, a small band and a blob at higher masses. In a first attempt to describe the data two different models are used to parametrize the dynamical amplitudes leading to the same conclusion: the data require a 0(++) and also a 2(++) resonance in the 1500 MeV region. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RUHR UNIV BOCHUM, W-4630 BOCHUM, GERMANY. HUNGARIAN ACAD SCI, H-1525 BUDAPEST, HUNGARY. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. CERN, CH-1211 GENEVA, SWITZERLAND. UNIV HAMBURG, D-22761 HAMBURG, GERMANY. UNIV KARLSRUHE, W-7500 KARLSRUHE, GERMANY. UNIV LONDON QUEEN MARY & WESTFIELD COLL, LONDON E1 4NS, ENGLAND. UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA. UNIV MAINZ, D-55099 MAINZ, GERMANY. UNIV MUNICH, D-80333 MUNICH, GERMANY. CTR RECH NUCL, F-67037 STRASBOURG, FRANCE. RP AMSLER, C (reprint author), UNIV ZURICH, CH-8001 ZURICH, SWITZERLAND. NR 10 TC 1 Z9 1 U1 0 U2 1 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1994 VL 107 IS 11 BP 2227 EP 2233 PG 7 WC Physics, Particles & Fields SC Physics GA QC031 UT WOS:A1994QC03100001 ER PT J AU AMSLER, C ARMSTRONG, DS AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T COOPER, A CRAMER, O CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MONTANET, L NOBLE, A OULDSAADA, F PETERS, K PINTER, G RAVNDAL, S SALK, J SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C AF AMSLER, C ARMSTRONG, DS AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T COOPER, A CRAMER, O CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MONTANET, L NOBLE, A OULDSAADA, F PETERS, K PINTER, G RAVNDAL, S SALK, J SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C TI HIDDEN AND OPEN (S)OVER-BAR-S PRODUCTION IN (P)OVER-BAR-P ANNIHILATION AT REST SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT Conference HADRON 93 CY JUN 21-25, 1993 CL COMO, ITALY ID ANTIPROTON-PROTON ANNIHILATION; PBARP ANNIHILATION; PHI-PRODUCTION; OZI RULE; STATES; GAMMA; OMEGA; KKBAR; ETA; PI AB New branching ratios for pp annihilation at rest into final states with a KK pair or phi-meson are being measured with the Crystal Barrel detector at LEAR. The yield of phi gamma, relative to omega gamma, appears to violate the OZI rule as strongly as phi pi relative to omega pi. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RUHR UNIV BOCHUM, W-4630 BOCHUM, GERMANY. HUNGARIAN ACAD SCI, H-1525 BUDAPEST, HUNGARY. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. CERN, CH-1211 GENEVA, SWITZERLAND. UNIV HAMBURG, D-22761 HAMBURG, GERMANY. UNIV KARLSRUHE, W-7500 KARLSRUHE, GERMANY. UNIV LONDON QUEEN MARY & WESTFIELD COLL, LONDON E1 4NS, ENGLAND. UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA. UNIV MAINZ, D-55099 MAINZ, GERMANY. UNIV MUNICH, D-80333 MUNICH, GERMANY. CTR RECH NUCL, F-67037 STRASBOURG, FRANCE. RP AMSLER, C (reprint author), UNIV ZURICH, CH-8001 ZURICH, SWITZERLAND. NR 23 TC 1 Z9 1 U1 0 U2 1 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1994 VL 107 IS 11 BP 2235 EP 2242 PG 8 WC Physics, Particles & Fields SC Physics GA QC031 UT WOS:A1994QC03100002 ER PT J AU AMSLER, C ARMSTRONG, DS AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T COOPER, A CRAMER, O CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, CW FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAY, H MERKEL, M MERLO, JP MEYER, CA MONTANET, L NOBLE, A OULDSAADA, F PETERS, K PINDER, C PINTER, G RAVNDAL, S SALK, J SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C AF AMSLER, C ARMSTRONG, DS AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T COOPER, A CRAMER, O CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, CW FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAY, H MERKEL, M MERLO, JP MEYER, CA MONTANET, L NOBLE, A OULDSAADA, F PETERS, K PINDER, C PINTER, G RAVNDAL, S SALK, J SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C TI (P)OVER-BAR-P ANNIHILATION AT REST INTO K-L(0)K-S(0)-PI(0)PI(0) SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT Conference HADRON 93 CY JUN 21-25, 1993 CL COMO, ITALY AB Investigations of purely neutral final states in ($) over bar pp annihilation are possible for the first time with the Crystal Barrel detector at LEAR. The high-mass resolution for pi(0)-mesons allows the reconstruction of K-S(0)-mesons in their neutral-pion decay. Moreover, non-interacting K-L(0)-mesons can be well identified by the measurement of missing energy. Annihilation into the channel (KLKS0)-K-0 pi(0) pi(0);0 proceeds predominantly via the following two-body intermediate states: K-1(1400)K-0, K-1(1270)K-0, K*($) over bar K*, phi(pi pi(S-wave). A partial-wave analysis gives a hint of a 1(+-) state decaying into K*K-0, which can be identified with the h(1)'(1380)-meson. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RUHR UNIV BOCHUM, D-44780 BOCHUM, GERMANY. HUNGARIAN ACAD SCI, H-1525 BUDAPEST, HUNGARY. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. CERN, CH-1211 GENEVA, SWITZERLAND. UNIV HAMBURG, D-22761 HAMBURG, GERMANY. UNIV KARLSRUHE, D-76344 KARLSRUHE, GERMANY. UNIV LONDON QUEEN MARY & WESTFIELD COLL, LONDON E1 4NS, ENGLAND. UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA. UNIV MAINZ, D-55099 MAINZ, GERMANY. UNIV MUNICH, D-80333 MUNICH, GERMANY. CTR RECH NUCL, F-67037 STRASBOURG, FRANCE. RP AMSLER, C (reprint author), UNIV ZURICH, CH-8001 ZURICH, SWITZERLAND. NR 4 TC 5 Z9 5 U1 0 U2 1 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1994 VL 107 IS 11 BP 2253 EP 2259 PG 7 WC Physics, Particles & Fields SC Physics GA QC031 UT WOS:A1994QC03100004 ER PT J AU AMSLER, C ARMSTRONG, DS AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T COOPER, A CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U MONTANET, L NOBLE, A OULDSAADA, F PETERS, K PINTER, G RAVNDAL, S SALK, J SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C AF AMSLER, C ARMSTRONG, DS AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T COOPER, A CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U MONTANET, L NOBLE, A OULDSAADA, F PETERS, K PINTER, G RAVNDAL, S SALK, J SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C TI ANTIPROTON-PROTON ANNIHILATION IN-FLIGHT SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT Conference HADRON 93 CY JUN 21-25, 1993 CL COMO, ITALY ID GEV/C AB This is an overview of the preliminary results of ($) over bar pp annihilation at incident ($) over bar p momenta of 600, 1200 and 1940 MeV/c(*). The data was taken at LEAR with the Crystal Barrel Detector (E. AKER et al: Nucl. Instrum, Methods A, 321, 108 (1992)). In the two pseudoscalar final states seven different channels are observable and their angular distributions are measured. They are compared to older data, if existent, and are found to be equal within the experimental errors. In the three-meson final states, an overview of the already examined final states is given. Striking signals in the Dalitz plots and invariant-mass projections for a set of final states are observed. In the final states eta eta pi(0) and eta eta eta a signal eta eta with the invariant mass of 1480 MeV/c(2) and a width of about Gamma approximate to approximate to 70 MeV/c(2) is visible. In the final-state omega eta pi(0) a signal in the omega eta invariant-mass spectrum at 1680 MeV/c(2) with a width Gamma approximate to 150 MeV/c(2) is observed. Finally, in the final-state omega omega pi(0) two visible structures in the Dalitz plot are detected at 1600 MeV/c(2)(Gamma approximate to 90 MeV/c(2)) and 1900 MeV/c(2) (Gamma approximate to 150 MeV/c(2)). C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RUHR UNIV BOCHUM, W-4630 BOCHUM, GERMANY. HUNGARIAN ACAD SCI, H-1525 BUDAPEST, HUNGARY. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. CERN, CH-1211 GENEVA, SWITZERLAND. UNIV HAMBURG, W-2000 HAMBURG, GERMANY. UNIV KARLSRUHE, W-7500 KARLSRUHE, GERMANY. UNIV LONDON QUEEN MARY & WESTFIELD COLL, LONDON E1 4NS, ENGLAND. UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA. UNIV MAINZ, W-6500 MAINZ, GERMANY. UNIV MUNICH, W-8000 MUNICH, GERMANY. CTR RECH NUCL, F-67037 STRASBOURG, FRANCE. RP AMSLER, C (reprint author), UNIV ZURICH, CH-8001 ZURICH, SWITZERLAND. OI Burchell, Mark/0000-0002-2680-8943; Meyer, Curtis/0000-0001-7599-3973 NR 8 TC 2 Z9 2 U1 0 U2 1 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1994 VL 107 IS 11 BP 2305 EP 2313 PG 9 WC Physics, Particles & Fields SC Physics GA QC031 UT WOS:A1994QC03100009 ER PT J AU AMSLER, C AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T COOPER, A CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U MONTANET, L NOBLE, A PETERS, K PINTER, G RAVNDAL, S SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C AF AMSLER, C AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T COOPER, A CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U MONTANET, L NOBLE, A PETERS, K PINTER, G RAVNDAL, S SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C TI PARTIAL-WAVE ANALYSIS OF THE PI-PI-ETA IN (P)OVER-BAR-P ANNIHILATION AT REST SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT Conference HADRON 93 CY JUN 21-25, 1993 CL COMO, ITALY ID MESON AB A new isovector scalar pi eta resonance with a mass of 1450 MeV is observed in a high-statistics study of ($) over bar pp annihilation at rest into pi(0) pi(0) eta. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RUHR UNIV BOCHUM, W-4630 BOCHUM, GERMANY. HUNGARIAN ACAD SCI, H-1525 BUDAPEST, HUNGARY. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. CERN, CH-1211 GENEVA, SWITZERLAND. UNIV HAMBURG, D-22761 HAMBURG, GERMANY. UNIV KARLSRUHE, W-7500 KARLSRUHE, GERMANY. UNIV LONDON QUEEN MARY & WESTFIELD COLL, LONDON E1 4NS, ENGLAND. UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA. UNIV MAINZ, D-55099 MAINZ, GERMANY. UNIV MUNICH, D-80333 MUNICH, GERMANY. CTR RECH NUCL, F-67037 STRASBOURG, FRANCE. RP AMSLER, C (reprint author), UNIV ZURICH, CH-8001 ZURICH, SWITZERLAND. NR 10 TC 1 Z9 1 U1 0 U2 1 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1994 VL 107 IS 11 BP 2321 EP 2327 PG 7 WC Physics, Particles & Fields SC Physics GA QC031 UT WOS:A1994QC03100011 ER PT J AU AMSLER, C AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T COOPER, A CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLER, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U MONTANET, L NOBLE, A PETERS, K PINTER, G RAVNDAL, S SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C AF AMSLER, C AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T COOPER, A CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLER, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U MONTANET, L NOBLE, A PETERS, K PINTER, G RAVNDAL, S SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTER, F WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C TI ANTIPROTON ANNIHILATION AT REST IN LIQUID DEUTERIUM INTO PI(-)PI(0)PI(0)P(S) SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT Conference HADRON 93 CY JUN 21-25, 1993 CL COMO, ITALY AB With the Crystal Barrel detector, the final state pi(-)pi(0) pi(0)p(s) at rest in liquid deuterium was measured for the first time. A preliminary partial-wave analysis was performed, which required two interesting features: besides the rho(770), a second pole was needed in the pi pi P-wave and a narrow resonance in the pi pi S-wave, slightly above 1500 MeV/c(2). With the same parametrization a high-statistics pi(+)pi(-)pi(0) data set could also be well described. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RUHR UNIV BOCHUM, W-4630 BOCHUM, GERMANY. HUNGARIAN ACAD SCI, H-1525 BUDAPEST, HUNGARY. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. CERN, CH-1211 GENEVA, SWITZERLAND. UNIV HAMBURG, D-22761 HAMBURG, GERMANY. UNIV KARLSRUHE, W-7500 KARLSRUHE, GERMANY. UNIV LONDON QUEEN MARY & WESTFIELD COLL, LONDON E1 4NS, ENGLAND. UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA. UNIV MAINZ, D-55099 MAINZ, GERMANY. UNIV MUNICH, D-80333 MUNICH, GERMANY. CTR RECH NUCL, F-67037 STRASBOURG, FRANCE. RP AMSLER, C (reprint author), UNIV ZURICH, CH-8001 ZURICH, SWITZERLAND. NR 8 TC 3 Z9 3 U1 0 U2 1 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1994 VL 107 IS 11 BP 2339 EP 2344 PG 6 WC Physics, Particles & Fields SC Physics GA QC031 UT WOS:A1994QC03100013 ER PT J AU BARNES, T AF BARNES, T TI HADRONIC MOLECULES AND SCATTERING-AMPLITUDES FROM THE NONRELATIVISTIC QUARK-MODEL SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT Conference HADRON 93 CY JUN 21-25, 1993 CL COMO, ITALY ID NUCLEON-NUCLEON-INTERACTION; SHORT-RANGE PART; BARYON-BARYON INTERACTION; K-PI SCATTERING; POTENTIAL MODEL; S-WAVE; SYSTEM; CHROMODYNAMICS; CONFINEMENT; DYNAMICS AB This report summarizes recent calculations of low-energy hadron-hadron scattering amplitudes in the nonrelativistic quark potential model, which assume that the scattering mechanism is a single interaction (usually OGE) followed by constituent interchange. We refer to the scattering diagrams as ''quark Born diagrams''. For the cases chosen to isolate this mechanism, I = 2 pi pi, I = = 3/2 K pi, KN and NN, the results are usually in good agreement with experimental S-wave scattering amplitudes given standard potential- model parameters. These calculations also lead to predictions of vector-vector bound states, one of which may be the theta(1710). This assignment can be tested by searches for K $($) over bar$$ K pi pi and phi pi(0) gamma decay modes of the theta(1710). C1 OAK RIDGE NATL LAB, CTR COMPUTATIONALLY INTENS PHYS, OAK RIDGE, TN 37831 USA. RP BARNES, T (reprint author), OAK RIDGE NATL LAB, DIV PHYS, OAK RIDGE, TN 37831 USA. NR 43 TC 3 Z9 4 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1994 VL 107 IS 11 BP 2491 EP 2498 DI 10.1007/BF02734021 PG 8 WC Physics, Particles & Fields SC Physics GA QC031 UT WOS:A1994QC03100034 ER PT J AU AMSLER, C ARMSTRONG, DS AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T COOPER, A CROWE, KM DIETZ, HP DOMBROWSKI, SV DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, M FELIX, C FOLGER, G HACKMAN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKI, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAY, H MERKEL, M MERLO, JP MEYER, CA MONTANET, L NOBLE, A OULDSAADA, F PETERS, K PINTER, G RAVNDAL, S SALK, J SANJARI, A SCHAFER, E SCHMID, B SCHMIDT, P STRASSBURGER, C STROHBUSCH, U SUFFERT, M UMER, D VOLCKER, C WALTER, F WALTHER, D WASSMER, S WIEDNER, U ZOLL, J ZUPANCIC, C AF AMSLER, C ARMSTRONG, DS AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BROSE, J BUGG, DV BURCHELL, M CASE, T COOPER, A CROWE, KM DIETZ, HP DOMBROWSKI, SV DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, M FELIX, C FOLGER, G HACKMAN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D JAVORFI, Z KALINOWSKI, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAY, H MERKEL, M MERLO, JP MEYER, CA MONTANET, L NOBLE, A OULDSAADA, F PETERS, K PINTER, G RAVNDAL, S SALK, J SANJARI, A SCHAFER, E SCHMID, B SCHMIDT, P STRASSBURGER, C STROHBUSCH, U SUFFERT, M UMER, D VOLCKER, C WALTER, F WALTHER, D WASSMER, S WIEDNER, U ZOLL, J ZUPANCIC, C TI TEST OF CHIRAL PERTURBATION-THEORY IN ETA-DECAYS SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT Conference HADRON 93 CY JUN 21-25, 1993 CL COMO, ITALY AB The decay of the vl-meson into three pions plays an important role as a test of low-energy QCD calculations in the framework of chiral perturbation theory. Previous experiments show results that are inconclusive or even contradictory. The Crystal Barrel experiment at LEAR has determined the braching ratios Gamma(eta-->-3 pi(0))/Gamma(eta-->eta(+)eta(-)eta(0)) = 1.47 +/- 0.09 +/- 0.15 and Gamma(eta-->gamma gamma)/Gamma(eta-->pi(+)pi(-)pi-(0)) = = 1.88 +/- 0.10 +/- 0.17 using its unique features to detect charged particles as well as neutral particles. The value for the first ratio agrees nicely with the theoretical predictions and solves previous experimantal uncertainties. The second value, which yields a partial width of Gamma(eta-->pi n(+)pi(-)pi(0)) = (0.24 +/- 0.03) keV, shows that the same next-to-leading order chiral perturbation theory calculations still have some problems. C1 RUHR UNIV BOCHUM, W-4630 BOCHUM, GERMANY. HUNGARIAN ACAD SCI, BUDAPEST, HUNGARY. CERN, CH-1211 GENEVA, SWITZERLAND. UNIV HAMBURG, HAMBURG, GERMANY. UNIV KARLSRUHE, KARLSRUHE, GERMANY. UNIV LONDON QUEEN MARY & WESTFIELD COLL, LONDON E1 4NS, ENGLAND. UNIV CALIF LOS ANGELES, LOS ANGELES, CA USA. UNIV MAINZ, W-6500 MAINZ, GERMANY. UNIV MUNICH, MUNICH, GERMANY. RUTHERFORD APPLETON LAB, CHILTON, ENGLAND. CTR RECH NUCL, STRASBOURG, FRANCE. UNIV ZURICH, ZURICH, SWITZERLAND. RP AMSLER, C (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. NR 9 TC 2 Z9 2 U1 0 U2 1 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1994 VL 107 IS 11 BP 2589 EP 2594 PG 6 WC Physics, Particles & Fields SC Physics GA QC031 UT WOS:A1994QC03100047 ER PT J AU CREUTZ, M AF CREUTZ, M TI LATTICE GAUGE-THEORY - PRESENT STATUS SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article; Proceedings Paper CT Conference HADRON 93 CY JUN 21-25, 1993 CL COMO, ITALY ID CHIRAL FERMIONS; ANOMALIES; BREAKING; SYMMETRY; QCD AB Lattice gauge theory is our primary tool for the study of non-perturbative phenomena in hadronic physics. In addition to giving quantitative information on confinement, the approach is yielding first-principles calculations of hadronic spectra and matrix elements. After years of confusion, there has been significant recent progress in understanding issues of chiral symmetry on the lattice. RP BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. NR 25 TC 1 Z9 1 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1994 VL 107 IS 11 BP 2595 EP 2602 DI 10.1007/BF02734035 PG 8 WC Physics, Particles & Fields SC Physics GA QC031 UT WOS:A1994QC03100048 ER PT J AU BEISSINGER, SR DONNAY, TJ WALTON, R AF BEISSINGER, SR DONNAY, TJ WALTON, R TI EXPERIMENTAL-ANALYSIS OF DIET SPECIALIZATION IN THE SNAIL KITE - THE ROLE OF BEHAVIORAL CONSERVATISM SO OECOLOGIA LA English DT Article DE BEHAVIORAL CONSERVATISM; COST OF SPECIALIZATION; DIET SPECIALIST; PROFITABILITY; RISK-AVERSE FORAGING ID FORAGING PREFERENCES; RISK-AVERSION; EVOLUTION; POPULATION; SELECTION; PREY; PROFITABILITY; VENEZUELA; PREDATION; BIOLOGY AB We examined factors maintaining extreme diet specialization in the snail kite (Rostrhamus sociabilis), a medium-sized hawk which feed almost exclusively on Pomacea snails, by determining why during some months kites eat crabs (Dilocarcinus dentatus) in the llanos of Venezuela. We offered snails and crabs of different sizes to wild free-flying birds to develop estimates for a prey choice model. Handling times of Pomacea doliodes snails averaged 90+/-39 s and were positively correlated with snail size. Handling times for crabs (xBAR=353+/-130 s) were significantly longer and exhibited greater variation than for snails, and were not correlated with crab size. Edible crab tissues had greater dry weights and contained more energy (25.37 kJ/g) than tissues of snails (16.91 kJ/g). Total energy of crabs was much greater than that of snails, and total energy of both foods was highly related to body length. We constructed an allometric equation for profitability of snails and crabs. Snails were more profitable than all but the largest crabs, but estimates of variance in profitability were greater for crabs. Predictions from the model were tested by offering crabs that represented equal, greater and much greater profitability than snails, to determine whether kites chose prey according to profitability. Only 15.6% of 289 food items chosen were crabs. Half of the 18 kites tested did not eat crabs and only 3 birds switched from snails to more profitable crabs. Four fledglings showed no preference for snails. The role of neophobia in food choice was investigated by offering unfamiliar snails (Pomacea urceus) to kites. Kites exhibited neophobic behaviors, and 5 of 12 birds chose not to capture P. urceus. Two-thirds of the 12 snails chosen were rejected immediately, but the others were handled efficiently (xBAR=133+/-89 s). Although morphological adaptations allow kites to specialize on snails, the costs of specialization were overcome for kites when the profitability of alternative food increased sufficiently. Our results suggest a role for behavioral conservatism, in the form of risk-averse foraging and neophobia, in maintaining severe diet specialization in the snail kite. C1 NATL ZOOL PK, DEPT ZOOL RES, WASHINGTON, DC 20008 USA. FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. RP BEISSINGER, SR (reprint author), YALE UNIV, SCH FORESTRY & ENVIRONM STUDIES, 205 PROSPECT ST, NEW HAVEN, CT 06511 USA. RI Beissinger, Steven/F-3809-2012 NR 75 TC 19 Z9 20 U1 3 U2 14 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0029-8549 EI 1432-1939 J9 OECOLOGIA JI Oecologia PD NOV PY 1994 VL 100 IS 1-2 BP 54 EP 65 DI 10.1007/BF00317130 PG 12 WC Ecology SC Environmental Sciences & Ecology GA PR645 UT WOS:A1994PR64500007 PM 28307027 ER PT J AU ELLISON, AM DIXON, PM NGAI, J AF ELLISON, AM DIXON, PM NGAI, J TI A NULL METHOD FOR NEIGHBORHOOD MODELS OF PLANT COMPETITIVE INTERACTIONS SO OIKOS LA English DT Article ID POPULATION DYNAMICS; FREQUENCY-DISTRIBUTIONS; ARABIDOPSIS-THALIANA; GERMINATION DATE; SPECIES MODELS; SIZE STRUCTURE; MONOCULTURES; INTERFERENCE; ANNUALS; ARRANGEMENT AB Neighborhood (spatial) models of plant populations have assumed implicitly that competition between adjacent individuals is the primary determinant of observed dynamics. In contrast, non-spatial models now routinely test this assumption against the null hypothesis that individual differences in intrinsic growth rate alone can explain observed patterns. In a widely-used neighborhood model (Pacala and Silander 1990), competition is modelled as a direct effect of neighbors on target plant biomass, which in turn affects plant fecundity. We have developed a statistical null model for Pacala and Silander's (1990) neighborhood model for plant monocultures that explicitly incorporates variation in plant growth rate, and permits a test of the hypothesis that neighborhood competition controls plant ground area occupied (= rosette diameter) and biomass. An additional alternative hypothesis to our model is that neighbors can affect fecundity independently of their effects on plant diameter and biomass. We tested these three hypotheses - (1) no effect of competition (null); (2) neighborhood competition directly affecting plant diameter and biomass, and indirectly affecting fecundity (Pacala and Silander 1990); (3) neighborhood competition directly affecting plant diameter, biomass, and fecundity - by replacing, with appropriate controls, Silander and Pacala's (1985) experiments with the rosette-forming crucifer, Arabidopsis thaliana. Neighborhood competition in dense stands resulted in simultaneous changes in plant diameter, biomass, and fecundity relative to plants grown in the absence of competition. There also were apparent effects of neighbors on plant fecundity independent of their effects on plant size alone. The null model was not supported, but Pacala and Silander's model did not fit the data as well as the model that incorporated direct effects of neighbors on plant fecundity. C1 CORNELL UNIV,ECOL & SYSTEMAT SECT,ITHACA,NY 14853. SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. RP ELLISON, AM (reprint author), MT HOLYOKE COLL,DEPT BIOL SCI,CLAPP LAB,S HADLEY,MA 01075, USA. OI Ellison, Aaron/0000-0003-4151-6081 NR 59 TC 20 Z9 20 U1 0 U2 7 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0030-1299 J9 OIKOS JI Oikos PD NOV PY 1994 VL 71 IS 2 BP 225 EP 238 DI 10.2307/3546270 PG 14 WC Ecology SC Environmental Sciences & Ecology GA PR376 UT WOS:A1994PR37600004 ER PT J AU FISCELLA, M ZAMBRANO, N ULLRICH, SJ UNGER, T LIN, D CHO, B MERCER, WE ANDERSON, CW APPELLA, E AF FISCELLA, M ZAMBRANO, N ULLRICH, SJ UNGER, T LIN, D CHO, B MERCER, WE ANDERSON, CW APPELLA, E TI THE CARBOXY-TERMINAL SERINE-392 PHOSPHORYLATION SITE OF HUMAN P53 IS NOT REQUIRED FOR WILD-TYPE ACTIVITIES SO ONCOGENE LA English DT Article ID TUMOR-SUPPRESSOR PROTEIN; CASEIN KINASE-II; CELL-CYCLE CONTROL; MUTANT P53; GENE AMPLIFICATION; GROWTH ARREST; BINDING-SITE; DNA; TRANSCRIPTION; EXPRESSION AB Wild-type p53 functions in the G1 DNA damage checkpoint pathway by activating gene transcription and preventing cell cycle progression. Others reported that mutation of the serine 386 codon in mouse p53 abolished its ability to suppress growth. Serine 386 of murine p53 and the homologous residue of human p53, serine 392, are phosphorylated in vivo and can be phosphorylated in vitro by casein kinase II (CKII). We constructed mutants that changed serine 392 of human p53 to alanine (p53-S392A) or aspartic acid (p53S392D); cotransfection of both these mutants with a reporter gene carrying a p53-responsive element into the p53-null Saos-2 cell line activated transcription as well as did wild-type p53. Furthermore, both mutants blocked cell cycle progression after transient transfection in these cells. A stable derivative of the T98G human glioblastoma cell line was established that expressed p53-S392A in response to dexamethasone. Overexpression of this mutant activated transcription of the endogenous waf1 (also called cip1) and mdm2 genes to the same extent as wild-type p53 and also produced growth arrest. Finally, p53-S392A and p53-S392D suppressed foci formation by activated ras and adenovirus EIA oncogenes as efficiently as did wild-type p53. Thus, unlike mutants that altered the serine 15 phosphorylation site, elimination of the serine 392 phosphorylation site had no discernible effect on p53 function. We conclude that neither phosphorylation nor RNA attachment to serine 392 are required for human p53's ability to suppress cell growth or to activate transcription in vivo. C1 NCI,CELL BIOL LAB,BETHESDA,MD 20892. NCI,TUMOR VIRUS BIOL LAB,BETHESDA,MD 20892. AMER RED CROSS,JEROME H HOLLAND LAB,ROCKVILLE,MD 20855. THOMAS JEFFERSON UNIV,JEFFERSON CANC INST,PHILADELPHIA,PA 19107. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RI Zambrano, Nicola/B-9352-2014 OI Zambrano, Nicola/0000-0001-9395-3481 FU NCI NIH HHS [CA55541, CA54140] NR 67 TC 67 Z9 67 U1 0 U2 3 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0950-9232 J9 ONCOGENE JI Oncogene PD NOV PY 1994 VL 9 IS 11 BP 3249 EP 3257 PG 9 WC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity GA PM658 UT WOS:A1994PM65800018 PM 7936649 ER PT J AU MA, QF WADLEIGH, D CHI, TH HERSCHMAN, H AF MA, QF WADLEIGH, D CHI, TH HERSCHMAN, H TI THE DROSOPHILA TIS11-HOMOLOG ENCODES A DEVELOPMENTALLY CONTROLLED GENE SO ONCOGENE LA English DT Article ID TETRADECANOYL PHORBOL ACETATE; PRIMARY RESPONSE GENE; SWISS 3T3 CELLS; NUCLEOTIDE EXCHANGE; TYROSINE KINASE; SEQUENCE; PROTEIN; RECEPTOR; GRB2; RAS AB We previously identified a murine primary response gene family containing three members; TIS11, TIS11B and TIS11D. Using degenerate oligonucleotides derived from conserved regions of the mouse TIS11 family cDNAs as primers and Drosophila genomic DNA as template for polymerase chain reaction amplification, we have identified a fly TIS11 homologue called DTIS11. The DTIS11 protein shares 90% sequence identity with the murine TIS11B and TIS11D proteins, over a 74 amino acid region that contains two CX(8)CX(5)CX(3)H repeated motifs separated by 18 amino acids. DTIS11 maps to region 11B(14-16) on the X-chromosome. Northern blot and in situ hybridization show that a maternal 3 kb message is present in embryos of early developmental stages. A 6 kb DTIS11 mRNA subsequently appears. In KC embryonal cells, both a strong 3 kb message and a less intense 6 kb message are present. The larger (6 kb) message is modestly induced in KC cells by both forskolin and tetradecanoyl phorbol acetate, and is stabilized by cycloheximide. C1 UNIV CALIF LOS ANGELES,CTR HLTH SCI,INST MOLEC BIOL,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,DOE,DEPT BIOL CHEM,STRUCT BIOL & MOLEC MED LAB,LOS ANGELES,CA 90024. FU NIGMS NIH HHS [GM24797] NR 31 TC 33 Z9 37 U1 0 U2 1 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0950-9232 J9 ONCOGENE JI Oncogene PD NOV PY 1994 VL 9 IS 11 BP 3329 EP 3334 PG 6 WC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity GA PM658 UT WOS:A1994PM65800027 PM 7936658 ER PT J AU JIANG, HP LIN, J SU, ZZ COLLART, FR HUBERMAN, E FISHER, PB AF JIANG, HP LIN, J SU, ZZ COLLART, FR HUBERMAN, E FISHER, PB TI INDUCTION OF DIFFERENTIATION IN HUMAN PROMYELOCYTIC HL-60 LEUKEMIA-CELLS ACTIVATES P21, WAF1/CIP1, EXPRESSION IN THE ABSENCE OF P53 SO ONCOGENE LA English DT Article ID PROTEIN KINASE-C; GLIOBLASTOMA-MULTIFORME CELLS; CYCLIN-DEPENDENT KINASES; MYELOID-LEUKEMIA; LINE HL-60; TERMINAL DIFFERENTIATION; TRANSFORMED PHENOTYPE; ANTIGENIC PHENOTYPE; GENE-EXPRESSION; RESISTANT AB The melanoma differentiation associated gene, mda-6, which is identical to the P53-inducible gene WAF1/CIP1, encodes an M(r) 21,000 protein (p21) that can directly inhibit cell growth by repressing cyclin dependent kinases, mda-6 was identified using subtraction hybridization by virtue of its enhanced expression in human melanoma cells induced to terminally differentiate by treatment with human fibroblast interferon and the anti-leukemic compound mezerein (Jiang and Fisher, 1993). In the present study, we demonstrate that mda-6 (WAF1/CIP1) is an immediate early response gene induced during differentiation of the promyelocytic HL-60 leukemia cell line along the granulocytic or macrophage/monocyte pathway. mda-6 gene expression in HL-60 cells is induced within 1 to 3 h during differentiation along the macrophage/monocyte pathway evoked by 12-0-tetradecanoyl phorbol-13-acetate (TPA) or 1,25-dihydroxyvitamin D3 (Vit D3) or the granulocytic pathway produced by retinoic acid (RA) or dimethylsulfoxide (DMSO). Immunoprecipitation analyses using an anti-p21 antibody indicate a temporal induction of p21 protein following treatment with TPA, DMSO or RA. A relationship between rapid induction of mda-6 gene expression and differentiation is indicated by a delay in this expression in an HL-60 cell variant resistant to TPA-induced growth arrest and differentiation. A similar delay in mda 6 gene expression is not observed in Vit D3 treated TPA-resistant variant cells that are also sensitive to induction of monocytic differentiation. Since HL-60 cells have a null-p53 phenotype, these results demonstrate that p21 induction occurs during initiation of terminal differentiation in a p53-independent manner. In this context, p21 may play a more global role in growth control and differentiation than originally envisioned. C1 COLUMBIA UNIV, COLL PHYSICIANS & SURGEONS,INST CANC RES, CTR COMPREHENS CANC ,DEPT PATHOL, NEW YORK, NY 10032 USA. COLUMBIA UNIV, COLL PHYSICIANS & SURGEONS,INST CANC RES, CTR COMPREHENS CANC,DEPT UROL, NEW YORK, NY 10032 USA. ARGONNE NATL LAB, CTR MECHANIST BIOL & BIOTECHNOL, ARGONNE, IL 60439 USA. OI Collart, Frank/0000-0001-6942-4483 FU NCI NIH HHS [CA43208, CA35675] NR 50 TC 602 Z9 610 U1 1 U2 13 PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0950-9232 J9 ONCOGENE JI Oncogene PD NOV PY 1994 VL 9 IS 11 BP 3397 EP 3406 PG 10 WC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity GA PM658 UT WOS:A1994PM65800037 PM 7936668 ER PT J AU HILLSMAN, EL ALVIC, DR BENNETT, JB AF HILLSMAN, EL ALVIC, DR BENNETT, JB TI THE BUREAU OF MINES ELECTRIC UTILITY MODEL SO OPERATIONS RESEARCH LA English DT Article ID RAIN POLICY ANALYSIS AB Discussion of alternative proposals to control emission precursors of acid precipitation focused on their effects on the electric power and coal industries. The Bureau of Mines was concerned about possible indirect effects on electricity-intensive mineral processing facilities, and sponsored research to help it estimate these effects. The research developed a modeling system to estimate compliance strategies and associated changes in electricity costs under different legislation, and dissemination of these results helped inform and broaden discussion of alternative proposals. Early recognition that design of the modeling system would have to allow for flexibility and change enabled development of a system that the Bureau of Mines can use to analyze a broad range of issues involving the electric utility industry, and that utilities or states can use for developing and screening plans to comply with the 1990 Clean Air Act Amendments. C1 UNIV TENNESSEE,CTR ENERGY ENVIRONM & RESOURCES,KNOXVILLE,TN 37996. US BUR MINES,WASHINGTON,DC 20241. RP HILLSMAN, EL (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 22 TC 0 Z9 0 U1 0 U2 2 PU OPERATIONS RES SOC AMER PI BALTIMORE PA 1314 GUILFORD AVENUE BUSINESS OFFICE, BALTIMORE, MD 21202 SN 0030-364X J9 OPER RES JI Oper. Res. PD NOV-DEC PY 1994 VL 42 IS 6 BP 998 EP 1009 DI 10.1287/opre.42.6.998 PG 12 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA PY505 UT WOS:A1994PY50500002 ER PT J AU CHING, MT BRENNEN, RA WHITE, RM AF CHING, MT BRENNEN, RA WHITE, RM TI MICROFABRICATED OPTICAL CHOPPER SO OPTICAL ENGINEERING LA English DT Article DE MICROOPTICS; MICROMECHANICS; OPTICAL FIBER; POLYSILICON; MICROFABRICATED; RESONANT MOTION AB A micromachined chopper has demonstrated modulation of coherent and incoherent light. The chopper uses an electrostatically driven lateral micromotor to actuate a shutter plate across a through-substrate window. Test devices have been fabricated and exhibit operating frequencies ranging from 1 to 31 kHz and have stable deflection amplitudes of 400 mu m. Further optimizations of the design are discussed. C1 UNIV CALIF BERKELEY,BERKELEY SENSOR & ACTUATOR CTR,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY SENSOR & ACTUATOR CTR,BERKELEY,CA 94720. RP CHING, MT (reprint author), INTEL CORP,BERKELEY SENSOR & ACTUATOR CTR,2200 MISS COLL BLVD M-S RN4-16,SANTA CLARA,CA 95052, USA. NR 14 TC 15 Z9 15 U1 0 U2 1 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD NOV PY 1994 VL 33 IS 11 BP 3634 EP 3642 DI 10.1117/12.181576 PG 9 WC Optics SC Optics GA PQ831 UT WOS:A1994PQ83100018 ER PT J AU WILLIAMS, S RAHN, LA PAUL, PH FORSMAN, JW ZARE, RN AF WILLIAMS, S RAHN, LA PAUL, PH FORSMAN, JW ZARE, RN TI LASER-INDUCED THERMAL GRATING EFFECTS IN FLAMES SO OPTICS LETTERS LA English DT Article AB Light scattering from a laser-induced thermal grating produced in an atmospheric-pressure H-2/O-2 flame is observed with a phase-matching geometry commonly used in resonant four-wave mixing and laser-induced grating spectroscopy. The presence of thermal gratings is confirmed in both the time and the frequency domains in two distinct experiments. Diluting the flame with helium decreases the thermal grating signal intensity. Experimental results agree well with calculations based on a solution of the linearized hydrodynamic equations. C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551. STANFORD UNIV,DEPT CHEM,STANFORD,CA 94305. RI Zare, Richard/A-8410-2009; OI Rahn, Larry/0000-0002-4793-1158 NR 11 TC 53 Z9 53 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD NOV 1 PY 1994 VL 19 IS 21 BP 1681 EP 1683 DI 10.1364/OL.19.001681 PG 3 WC Optics SC Optics GA PN868 UT WOS:A1994PN86800003 PM 19855620 ER PT J AU LEE, HWH HUGHES, RS AF LEE, HWH HUGHES, RS TI ANTIRESONANT RING INTERFEROMETRIC NONLINEAR SPECTROSCOPY FOR NONLINEAR-OPTICAL MEASUREMENTS SO OPTICS LETTERS LA English DT Article ID 2-PHOTON ABSORPTION; NM AB We describe a sensitive and simple single-beam technique to measure simultaneously the real and the imaginary contributions to the complex optical nonlinearity (the nonlinear refraction and absorption). We call this technique antiresonant ring interferometric nonlinear spectroscopy (ARINS). An antiresonant ring interferometer, which has improved stability, is used to detect very small changes in the phase and the amplitude of an optical beam. This allows very low intensities to be used and eliminates many interfering processes present in other techniques that require higher intensities. We demonstrate ARINS by measuring the optical nonlinearities of bulk ZnS, KDP, and C-70 thin films. RP LEE, HWH (reprint author), LAWRENCE LIVERMORE NATL LAB,L-45,POB 808,LIVERMORE,CA 94551, USA. NR 11 TC 12 Z9 12 U1 0 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD NOV 1 PY 1994 VL 19 IS 21 BP 1708 EP 1710 DI 10.1364/OL.19.001708 PG 3 WC Optics SC Optics GA PN868 UT WOS:A1994PN86800012 PM 19855629 ER PT J AU CHILLIER, XFD VANBERKEL, GJ GULACAR, FO BUCHS, A AF CHILLIER, XFD VANBERKEL, GJ GULACAR, FO BUCHS, A TI CHARACTERIZATION OF CHLORINS WITHIN A NATURAL CHLORIN MIXTURE USING ELECTROSPRAY ION-TRAP MASS-SPECTROMETRY SO ORGANIC MASS SPECTROMETRY LA English DT Article ID ION TRAP AB Chlorins in a sedimentary mixture were characterized, without prior isolation of individual components, using electrospray ionization combined with ion trap mass spectrometry. Collision-induced dissociation in the atmospheric sampling interface and multi-step mass spectrometry (i.e. MS(n) where n greater than or equal to 2) were used in order to obtain structural information about the macrocycle. Fragmentation pathways are proposed for different macrocycle types based on data from model chlorins. Three unknown chlorins (RMM = 888, 844 and 790) are assigned as having bacteriochlorophyll macrocycle types esterified to unusual side-chains (i.e, dihydrophytol for the unknown with a bacteriopheophorbide a structure, phytol and an alcohol with a molecular mass of 242 u for the two unknowns with a proposed bacteriopyropheophorbide d structure). C1 UNIV GENEVA,SPECTROMETRIE MASSE LAB,CH-1211 GENEVA,SWITZERLAND. RP CHILLIER, XFD (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831, USA. NR 19 TC 10 Z9 11 U1 0 U2 1 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0030-493X J9 ORG MASS SPECTROM JI Org. Mass Spectrom. PD NOV PY 1994 VL 29 IS 11 BP 672 EP 678 DI 10.1002/oms.1210291116 PG 7 WC Chemistry, Organic; Spectroscopy SC Chemistry; Spectroscopy GA QF691 UT WOS:A1994QF69100016 ER PT J AU CLARK, DL GORDON, JC HUFFMAN, JC WATKIN, JG ZWICK, BD AF CLARK, DL GORDON, JC HUFFMAN, JC WATKIN, JG ZWICK, BD TI A SAMARIUM ALKYL-ARYLOXIDE COMPLEX CONTAINING A TRIGONAL BIPYRAMIDAL CARBON-ATOM - X-RAY STRUCTURE OF [LI(THF)]2[SM(O-2,6-I-PR2C6H3)(3)(CH(2)SIME(3))(2)] SO ORGANOMETALLICS LA English DT Article ID TERTIARY PHOSPHINE ADDUCTS; CRYSTAL-STRUCTURE; ORGANOMETALLIC COMPOUNDS; MANGANESE(II) DIALKYLS; RARE-EARTHS; REACTIVITY; (C5ME5)2SM(THF)2; CHEMISTRY; BONDS AB Reaction of Sm(O-2,6-i-Pr2C6H3)(3)(THF)(2) (1) with 3 equiv of LiCH(2)SiMe(3) in THF solution produces the salt complex (Me(3)SiCH(2))Sm[(mu-OAr)(mu-CH(2)SiMe(3))Li(THF)][(mu-OAr)(2)Li(THF)] (2, Ar = 2,6-i-Pr2C6H3) in 58% yield. H-1 and C-13 NMR are extremely complex, while Li-7 NMR is indicative of an equilibrium between 2 and free LiO-2,6-i-Pr2C6H3 in solution. Compound 2 contains a pentacoordinate samarium metal center ligated by one terminal and one bridging CH(2)SiMe(3) Ligand and three bridging O-2,6-i-Pr2CsH3 ligands. Each lithium atom is coordinated to one molecule of THF and either two aryloxide ligands or one aryloxide and one alkyl bridging Ligand. The bridging groups combine to make two fused four-membered metallacyclic rings, one Sm-O-Li-O and one Sm-C-Li-O ring [C-Sm = 2.564(10) Angstrom, C-Li = 2.219(20) Angstrom]. The molecule crystallizes in the monoclinic space group C2/c, with a = 32.017(8) A, b = 21.163(5) Angstrom, c = 22.354(6) Angstrom, beta = 128.03(1)degrees, V = 11931.34 Angstrom(3), d(calc) = 1.130 g cm(-3), and Z = 8. C1 LOS ALAMOS NATL LAB,NUCL MAT TECHNOL GRP,NMT6,LOS ALAMOS,NM 87545. INDIANA UNIV,CTR MOLEC STRUCT,BLOOMINGTON,IN 47405. RP CLARK, DL (reprint author), LOS ALAMOS NATL LAB,INORGAN STRUCT & APPL CHEM GRP CST3,LOS ALAMOS,NM 87545, USA. RI Clark, David/A-9729-2011 NR 38 TC 27 Z9 27 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD NOV PY 1994 VL 13 IS 11 BP 4266 EP 4270 DI 10.1021/om00023a032 PG 5 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA PR279 UT WOS:A1994PR27900032 ER PT J AU WHITE, CJ WANG, TL JACOBSON, RA ANGELICI, RJ AF WHITE, CJ WANG, TL JACOBSON, RA ANGELICI, RJ TI SYNTHESIS, EQUILIBRIUM BINDING, AND SE-77 NMR-STUDIES OF ETA(1)-SELENOPHENE (SELN) COMPLEXES - [CPRU(CO)(PPH(3))(ETA(1)(SE)-SELN)]BF4 SO ORGANOMETALLICS LA English DT Article ID SULFUR-COORDINATED THIOPHENES; HYDRODESULFURIZATION CATALYSTS; METAL-COMPLEXES; ADSORPTION; MODEL; (ETA-THIOPHENE)RU(ETA-C5H5)+; CP(CO)(PPH3)RU(ETA-1(S)-TH)+; REACTIVITY; EXCHANGE; TH AB Reactions of Cp(CO)(PPh(3))RuCl (Cp = C5H5) with Ag+ and selenophenes (Seln) produce the stable selenium-bound (eta(1)(Se)) selenophene complexes [Cp(CO)(PPh(3))Ru(eta(1)(Se)-Seln)](+) (Seln = selenophepe (Sel), 2-methylselenophene (2-MeSel), and 2,5-dimethylselenophene (2,5- MeSel)). The molecular structure of [Cp(CO)(PPh(3))Ru(eta(1)(Se)-2-MeSel)](+) was determined, and H-1 and C-13 NMR and IR data for all of the Seln complexes are compared with those of their thiophene analogs. Equilibrium constants (K') for the replacement of thiophene (T) by selenophenes, thiophenes, benzo[b]thiophene (BT), dibenzothiophene (DBT), 2,8-dimethyldibenzothiophene (2,8-Me(2)DBT), and p-tolyl sulfide (PTS) increase in the following order: T (1.00) < 2,5-Me(2)T (2.76) < 2-MeT (4.11) < 3-MeT (6.30) < Sel (23.8) < BT (29.9) < DBT (74.1) < 2-MeSel (100) < 2,5-Me(2)Sel (175) < 2,8-Me(2)DBT (358) < PTS (7.11 x 10(3)). The selenophenes bind more strongly than the analogous thiophenes. Electron-releasing methyl groups in selenophene and DBT increase the binding constants (K') of the methyl-substituted selenophenes and 2,8-Me(2)DBT. A Se-77 NMR study of free selenophenes and their Complexes establishes Se-77 chemical shift ranges that are characteristic of eta(1)(Se), eta(2), and eta(5) modes of selenophene coordination to transition metals. Crystals of Cp(CO)(PPh(3))Ru(eta(1)(Se)-2-MeSel)]BF4 are triclinic, space group P $($) over bar$$ 1 (No. 2) with a = 10.594(2) Angstrom, b = 14.276(2), c = 9.402(2) Angstrom, alpha = 97.97(2)degrees, beta = 91.63(2)degrees, gamma = 87.47(1)degrees, and Z = 4. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 34 TC 14 Z9 14 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD NOV PY 1994 VL 13 IS 11 BP 4474 EP 4480 DI 10.1021/om00023a058 PG 7 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA PR279 UT WOS:A1994PR27900058 ER PT J AU VAIDYA, RU SONG, SG ZUREK, AK AF VAIDYA, RU SONG, SG ZUREK, AK TI DYNAMIC-MECHANICAL RESPONSE AND THERMAL-EXPANSION OF CERAMIC PARTICLE-REINFORCED ALUMINUM 6061 MATRIX COMPOSITES SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID SILICON-CARBIDE; FRACTURE; DEFORMATION; STRENGTH AB The mechanical response of silicon carbide (SiC) particle and boron carbide (B4C) particle reinforced aluminium 6061 alloy was studied under quasi-static and dynamic loading conditions, using an Instron universal testing machine and split Hopkinson pressure bar respectively. The stiffness and yield strength of the B4C and SiC particle composites were significantly enhanced as compared to the unreinforced alloy. The strain hardening behaviour of the SiC particle reinforced composites was not significantly different as compared to that of the unreinforced alloy, at either low or high strain rates. On the other hand, the strength and strain hardening of the B4C particle reinforced composites was significantly greater than that of the unreinforced alloy, at both low and high strain rates. Differences in the mechanical behaviour of the two composites was attributed to the differences in the strength of the reinforcing particles and bonding between the B4C and SiC particles and the matrix alloy. Thermal expansion measurements carried out on the unreinforced alloy and composite samples attested to the findings of mechanical testing and microscopy. RP VAIDYA, RU (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 29 TC 22 Z9 23 U1 4 U2 15 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD NOV PY 1994 VL 70 IS 5 BP 819 EP 836 PG 18 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA PQ062 UT WOS:A1994PQ06200007 ER PT J AU SHAGAM, RN AF SHAGAM, RN TI DIFFUSERS SIMPLIFY AIRCRAFT INSPECTION SO PHOTONICS SPECTRA LA English DT Article RP SHAGAM, RN (reprint author), SANDIA NATL LABS,AGING AIRCRAFT PROGRAM,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAURIN PUBL CO INC PI PITTSFIELD PA BERKSHIRE COMMON PO BOX 1146, PITTSFIELD, MA 01202 SN 0731-1230 J9 PHOTON SPECTRA JI Photon. Spect. PD NOV PY 1994 VL 28 IS 11 BP 90 EP & PG 0 WC Optics SC Optics GA PQ578 UT WOS:A1994PQ57800031 ER PT J AU JERVIS, TR AF JERVIS, TR TI EXCIMERS SHOW POTENTIAL FOR PROSTHETICS SO PHOTONICS SPECTRA LA English DT Article RP JERVIS, TR (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAURIN PUBL CO INC PI PITTSFIELD PA BERKSHIRE COMMON PO BOX 1146, PITTSFIELD, MA 01202 SN 0731-1230 J9 PHOTON SPECTRA JI Photon. Spect. PD NOV PY 1994 VL 28 IS 11 BP 102 EP & PG 0 WC Optics SC Optics GA PQ578 UT WOS:A1994PQ57800036 ER PT J AU FRISCHHERZ, MC KIRK, MA FARMER, J GREENWOOD, LR WEBER, HW AF FRISCHHERZ, MC KIRK, MA FARMER, J GREENWOOD, LR WEBER, HW TI DEFECT CASCADES PRODUCED BY NEUTRON-IRRADIATION IN YBA2CU3O7-DELTA SO PHYSICA C LA English DT Article ID SINGLE-CRYSTAL YBA2CU3O7-DELTA; HIGH-TC-SUPERCONDUCTORS; TRANSITION-TEMPERATURE; OXIDE SUPERCONDUCTORS; ELECTRON-MICROSCOPY; ANISOTROPY; MAGNETIZATION; CLUSTERS; DAMAGE; FIELD AB Defect cascades produced by fast neutron irradiation of YBa2Cu3O7-delta single crystals were studied by transmission electron microscopy. The visible defects were found to have sizes between 1 and 5 nm. Defect densities were obtained as a function of neutron fluence between 2 x 10(21) and 8 x 10(21) m-2 (E > 0.1 MeV) and compared to damage calculations. The measured defect density scales linearly with fluence and amounts to 1 x 10(22) m-3 at a neutron fluence of 2 x 10(21) m-2. The defect stability was studied at room temperature and through annealing to 400-degrees-C. C1 UNIV VIENNA, INST ATOM, A-1020 VIENNA, AUSTRIA. ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. UNIV MISSOURI, RES REACTOR, COLUMBIA, MO 65211 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RI Greenwood, Lawrence/H-9539-2016 OI Greenwood, Lawrence/0000-0001-6563-0650 NR 66 TC 61 Z9 61 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD NOV 1 PY 1994 VL 232 IS 3-4 BP 309 EP 327 DI 10.1016/0921-4534(94)90790-0 PG 19 WC Physics, Applied SC Physics GA PQ572 UT WOS:A1994PQ57200013 ER PT J AU FOURNIER, KB FINKENTHAL, M LIPPMANN, S HOLMES, CP MOOS, HW GOLDSTEIN, WH OSTERHELD, AL AF FOURNIER, KB FINKENTHAL, M LIPPMANN, S HOLMES, CP MOOS, HW GOLDSTEIN, WH OSTERHELD, AL TI N=5 TO N=5 SOFT-X-RAY EMISSION OF URANIUM IN A HIGH-TEMPERATURE LOW-DENSITY TOKAMAK PLASMA SO PHYSICAL REVIEW A LA English DT Article ID HEAVY-ATOMS; SPECTRA; IONS C1 LAWRENCE LIVERMORE NATL LAB,DIV L,LIVERMORE,CA 94550. HEBREW UNIV JERUSALEM,RACAH INST PHYS,JERUSALEM,ISRAEL. GEN ATOM CO,SAN DIEGO,CA 92186. RP FOURNIER, KB (reprint author), JOHNS HOPKINS UNIV,DEPT PHYS & ASTRON,BALTIMORE,MD 21218, USA. NR 14 TC 8 Z9 8 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD NOV PY 1994 VL 50 IS 5 BP 3727 EP 3733 DI 10.1103/PhysRevA.50.3727 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA PR435 UT WOS:A1994PR43500024 ER PT J AU PEGG, DJ TANG, CY WOOD, JR DELLWO, J ALTON, GD AF PEGG, DJ TANG, CY WOOD, JR DELLWO, J ALTON, GD TI CROSS-SECTION FOR THE PHOTODETACHMENT OF BE- SO PHYSICAL REVIEW A LA English DT Article ID NEGATIVE BERYLLIUM; ION C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. RP PEGG, DJ (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 10 TC 10 Z9 10 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD NOV PY 1994 VL 50 IS 5 BP 3861 EP 3864 DI 10.1103/PhysRevA.50.3861 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA PR435 UT WOS:A1994PR43500042 ER PT J AU VEGH, L MACEK, JH AF VEGH, L MACEK, JH TI COHERENCES IN THE DECAY OF AUTOIONIZING STATES IN PHOTOIONIZATION .1. EXCHANGE EFFECT BETWEEN PHOTO AND AUGER ELECTRONS SO PHYSICAL REVIEW A LA English DT Article C1 UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37966. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP VEGH, L (reprint author), HUNGARIAN ACAD SCI,INST NUCL RES,POB 51,H-4001 DEBRECEN,HUNGARY. NR 14 TC 48 Z9 48 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 NOV PY 1994 VL 50 IS 5 BP 4031 EP 4035 DI 10.1103/PhysRevA.50.4031 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA PR435 UT WOS:A1994PR43500063 ER PT J AU FANG, MP SOKOL, PE WANG, Y AF FANG, MP SOKOL, PE WANG, Y TI STRUCTURE OF D-2 IN ZEOLITE SO PHYSICAL REVIEW B LA English DT Article ID POROUS VYCOR GLASS; MOLECULAR-HYDROGEN; LIQUID-HYDROGEN C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP FANG, MP (reprint author), PENN STATE UNIV,DEPT PHYS,104 DAVEY LAB,UNIVERSITY PK,PA 16802, USA. NR 25 TC 10 Z9 10 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1994 VL 50 IS 17 BP 12291 EP 12296 DI 10.1103/PhysRevB.50.12291 PG 6 WC Physics, Condensed Matter SC Physics GA PR261 UT WOS:A1994PR26100001 ER PT J AU WANG, CZ HO, KM AF WANG, CZ HO, KM TI STRUCTURAL TRENDS IN AMORPHOUS-CARBON SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-DYNAMICS SIMULATION; DIAMOND-LIKE FILMS; ELECTRONIC-PROPERTIES; SILICON; GROWTH; SI C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP WANG, CZ (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 31 TC 40 Z9 40 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1994 VL 50 IS 17 BP 12429 EP 12436 DI 10.1103/PhysRevB.50.12429 PG 8 WC Physics, Condensed Matter SC Physics GA PR261 UT WOS:A1994PR26100018 ER PT J AU MALIK, SK TAKEYA, H GSCHNEIDNER, KA AF MALIK, SK TAKEYA, H GSCHNEIDNER, KA TI MAGNETIC-SUSCEPTIBILITY AND HEAT-CAPACITY MEASUREMENTS ON PRRHSB SO PHYSICAL REVIEW B LA English DT Article ID VALENCE-FLUCTUATION; SUPERCONDUCTIVITY; BEHAVIOR; SYSTEM C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. RP MALIK, SK (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 15 TC 3 Z9 3 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1994 VL 50 IS 17 BP 12540 EP 12545 DI 10.1103/PhysRevB.50.12540 PG 6 WC Physics, Condensed Matter SC Physics GA PR261 UT WOS:A1994PR26100029 ER PT J AU HARRIS, QJ FENG, Q BIRGENEAU, RJ HIROTA, K KAKURAI, K LORENZO, JE SHIRANE, G HASE, M UCHINOKURA, K KOJIMA, H TANAKA, I SHIBUYA, Y AF HARRIS, QJ FENG, Q BIRGENEAU, RJ HIROTA, K KAKURAI, K LORENZO, JE SHIRANE, G HASE, M UCHINOKURA, K KOJIMA, H TANAKA, I SHIBUYA, Y TI THERMAL CONTRACTION AT THE SPIN-PEIERLS TRANSITION IN CUGEO3 SO PHYSICAL REVIEW B LA English DT Article ID CHAIN C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. UNIV TOKYO,DEPT APPL PHYS,BUNKYO KU,TOKYO 113,JAPAN. YAMANASHI UNIV,INST INORGAN SYNTH,KOFU,YAMANASHI 400,JAPAN. RP HARRIS, QJ (reprint author), MIT,DEPT PHYS,CAMBRIDGE,MA 02139, USA. RI Hirota, Kazuma/C-6797-2008; Tanaka, Isao/D-1519-2012; Hase, Masashi/B-8900-2008; OI Hase, Masashi/0000-0003-2717-461X; Tanaka, Isao/0000-0002-2736-7107 NR 23 TC 76 Z9 76 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 NOV 1 PY 1994 VL 50 IS 17 BP 12606 EP 12610 DI 10.1103/PhysRevB.50.12606 PG 5 WC Physics, Condensed Matter SC Physics GA PR261 UT WOS:A1994PR26100038 ER PT J AU VOLKEL, AR WYSIN, GM MERTENS, FG BISHOP, AR SCHNITZER, HJ AF VOLKEL, AR WYSIN, GM MERTENS, FG BISHOP, AR SCHNITZER, HJ TI COLLECTIVE-VARIABLE APPROACH TO THE DYNAMICS OF NONLINEAR MAGNETIC EXCITATIONS WITH APPLICATION TO VORTICES SO PHYSICAL REVIEW B LA English DT Article ID ANISOTROPIC HEISENBERG-MODEL; EASY-PLANE FERROMAGNETS; 2-DIMENSIONAL XY-MODEL; MOTION RP VOLKEL, AR (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,MS B262,LOS ALAMOS,NM 87545, USA. RI Wysin, Gary/I-8162-2012 OI Wysin, Gary/0000-0001-8422-800X NR 20 TC 18 Z9 18 U1 1 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1994 VL 50 IS 17 BP 12711 EP 12720 DI 10.1103/PhysRevB.50.12711 PG 10 WC Physics, Condensed Matter SC Physics GA PR261 UT WOS:A1994PR26100050 ER PT J AU SCHMELTZER, D BISHOP, AR AF SCHMELTZER, D BISHOP, AR TI BOSONIZATION IN 2 DIMENSIONS - A SPACE-TIME TUNNELING APPROACH SO PHYSICAL REVIEW B LA English DT Article ID STATE; MODEL C1 LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. RP SCHMELTZER, D (reprint author), CUNY CITY COLL, DEPT PHYS, NEW YORK, NY 10031 USA. NR 21 TC 7 Z9 7 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1994 VL 50 IS 17 BP 12733 EP 12743 DI 10.1103/PhysRevB.50.12733 PG 11 WC Physics, Condensed Matter SC Physics GA PR261 UT WOS:A1994PR26100053 ER PT J AU SHAKED, H SHIMAKAWA, Y HUNTER, BA RADAELLI, PG DABROWSKI, B HITTERMAN, RL JORGENSEN, JD HAN, PD PAYNE, DA KIKKAWA, S ER, G KANAMARU, F AF SHAKED, H SHIMAKAWA, Y HUNTER, BA RADAELLI, PG DABROWSKI, B HITTERMAN, RL JORGENSEN, JD HAN, PD PAYNE, DA KIKKAWA, S ER, G KANAMARU, F TI STRUCTURAL EFFECTS OF HYDROSTATIC-PRESSURE IN SR(1-X)M(X)CUO(2) (M=LA,CA) AND SR4CU6O10 SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; NEUTRON POWDER DIFFRACTION; CHARGE-TRANSFER; SYSTEM; CUO; TC C1 UNIV ILLINOIS,DEPT MAT SCI & ENGN,URBANA,IL 61801. OSAKA UNIV,INST SCI & IND RES,IBARAKI,OSAKA 567,JAPAN. RP SHAKED, H (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Kikkawa, Shinichi/A-7482-2012; Radaelli, Paolo/C-2952-2011 OI Radaelli, Paolo/0000-0002-6717-035X NR 34 TC 12 Z9 12 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 NOV 1 PY 1994 VL 50 IS 17 BP 12752 EP 12759 DI 10.1103/PhysRevB.50.12752 PG 8 WC Physics, Condensed Matter SC Physics GA PR261 UT WOS:A1994PR26100056 ER PT J AU SOK, JH FINNEMORE, DK AF SOK, JH FINNEMORE, DK TI THERMAL DEPINNING OF A SINGLE SUPERCONDUCTING VORTEX IN NB SO PHYSICAL REVIEW B LA English DT Article ID JUNCTIONS C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,ASTRON PROGRAM,AMES,IA 50011. RP SOK, JH (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 7 TC 14 Z9 14 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1994 VL 50 IS 17 BP 12770 EP 12773 DI 10.1103/PhysRevB.50.12770 PG 4 WC Physics, Condensed Matter SC Physics GA PR261 UT WOS:A1994PR26100059 ER PT J AU BULAEVSKII, LN ZAMORA, M BAERISWYL, D BECK, H CLEM, JR AF BULAEVSKII, LN ZAMORA, M BAERISWYL, D BECK, H CLEM, JR TI TIME-DEPENDENT EQUATIONS FOR PHASE DIFFERENCES AND A COLLECTIVE MODE IN JOSEPHSON-COUPLED LAYERED SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; VORTEX LATTICE; MAGNETIC-FIELD; DYNAMICS C1 UNIV FRIBOURG,INST PHYS THEOR,CH-1700 FRIBOURG,SWITZERLAND. UNIV NEUCHATEL,INST PHYS,CH-2000 NEUCHATEL,SWITZERLAND. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP BULAEVSKII, LN (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 21 TC 130 Z9 131 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1994 VL 50 IS 17 BP 12831 EP 12834 DI 10.1103/PhysRevB.50.12831 PG 4 WC Physics, Condensed Matter SC Physics GA PR261 UT WOS:A1994PR26100066 ER PT J AU GRONBECHJENSEN, N CIRILLO, M AF GRONBECHJENSEN, N CIRILLO, M TI PHASE-LOCKING OF FISKE MODES IN SINE-GORDON SYSTEMS SO PHYSICAL REVIEW B LA English DT Article ID JOSEPHSON TUNNEL-JUNCTIONS; FLUXON; OSCILLATIONS; STEPS C1 UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00133 ROME,ITALY. RP GRONBECHJENSEN, N (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 14 TC 19 Z9 19 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1994 VL 50 IS 17 BP 12851 EP 12854 DI 10.1103/PhysRevB.50.12851 PG 4 WC Physics, Condensed Matter SC Physics GA PR261 UT WOS:A1994PR26100068 ER PT J AU STERNLIEB, BJ TRANQUADA, JM SHIRANE, G SATO, M SHAMOTO, S AF STERNLIEB, BJ TRANQUADA, JM SHIRANE, G SATO, M SHAMOTO, S TI Q-DEPENDENCE OF THE DYNAMIC SUSCEPTIBILITY CHI''(Q,OMEGA) IN SUPERCONDUCTING YBA2CU3O6.6 (T-C=46-K) SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; NEUTRON-SCATTERING; MAGNETIC FLUCTUATIONS; LA2-XSRXCUO4; RELAXATION C1 NAGOYA UNIV,DEPT PHYS,NAGOYA,AICHI 46401,JAPAN. RP STERNLIEB, BJ (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Tranquada, John/A-9832-2009 OI Tranquada, John/0000-0003-4984-8857 NR 16 TC 39 Z9 39 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1994 VL 50 IS 17 BP 12915 EP 12919 DI 10.1103/PhysRevB.50.12915 PG 5 WC Physics, Condensed Matter SC Physics GA PR261 UT WOS:A1994PR26100075 ER PT J AU GRIMSDITCH, M POPOVA, S BRAZHKIN, VV VOLOSHIN, RN AF GRIMSDITCH, M POPOVA, S BRAZHKIN, VV VOLOSHIN, RN TI TEMPERATURE-INDUCED AMORPHIZATION OF SIO2 STISHOVITE SO PHYSICAL REVIEW B LA English DT Note ID ALPHA-QUARTZ; ELASTIC INSTABILITY; MOLECULAR-DYNAMICS; AMORPHOUS STATE; RAMAN-SPECTRA; PRESSURE; PHASES; TRANSITION; CRYSTALS C1 RUSSIAN ACAD SCI,INST HIGH PRESSURE PHYS,TROITSK 142092,RUSSIA. RP GRIMSDITCH, M (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 32 TC 29 Z9 29 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1994 VL 50 IS 17 BP 12984 EP 12986 DI 10.1103/PhysRevB.50.12984 PG 3 WC Physics, Condensed Matter SC Physics GA PR261 UT WOS:A1994PR26100086 ER PT J AU SARRAO, JL MANDRUS, D MIGLIORI, A FISK, Z TANAKA, I KOJIMA, H CANFIELD, PC KODALI, PD AF SARRAO, JL MANDRUS, D MIGLIORI, A FISK, Z TANAKA, I KOJIMA, H CANFIELD, PC KODALI, PD TI COMPLETE ELASTIC-MODULI OF LA2-XSRXCUO4 (X=0.00 AND 0.14) NEAR THE TETRAGONAL-ORTHORHOMBIC STRUCTURAL PHASE-TRANSITION SO PHYSICAL REVIEW B LA English DT Article ID CRYSTAL-STRUCTURE; SINGLE-CRYSTALS; TEMPERATURE; LA2CUO4; SUPERCONDUCTIVITY; DEPENDENCE; CONSTANTS; PRESSURE; SYMMETRY; SOLIDS C1 UNIV CALIF SAN DIEGO, DEPT PHYS, LA JOLLA, CA 92093 USA. YAMANASHI UNIV, INST INORGAN SYNTH, KOFU, YAMANASHI 4000, JAPAN. RP LOS ALAMOS NATL LAB, POB 1663, LOS ALAMOS, NM 87545 USA. RI Tanaka, Isao/D-1519-2012; Mandrus, David/H-3090-2014; Canfield, Paul/H-2698-2014 NR 36 TC 16 Z9 16 U1 1 U2 9 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 NOV 1 PY 1994 VL 50 IS 18 BP 13125 EP 13131 DI 10.1103/PhysRevB.50.13125 PG 7 WC Physics, Condensed Matter SC Physics GA PT410 UT WOS:A1994PT41000004 ER PT J AU SPACZER, M CARO, A VICTORIA, M DELARUBIA, TD AF SPACZER, M CARO, A VICTORIA, M DELARUBIA, TD TI COMPUTER-SIMULATIONS OF DISORDERING KINETICS IN IRRADIATED INTERMETALLIC COMPOUNDS SO PHYSICAL REVIEW B LA English DT Article ID EMBEDDED-ATOM-METHOD; SHORT-RANGE ORDER; CONCENTRATION FLUCTUATIONS; THRESHOLD DISPLACEMENT; PHASE FORMATION; MOLTEN ALLOYS; NI3AL; ENERGIES; METALS C1 CTR ATOM BARILOCHE,RA-8400 BARILOCHE,RIO NEGRO,ARGENTINA. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP SPACZER, M (reprint author), ECOLE POLYTECH FED LAUSANNE,CRPP,DIV FUS TECHNOL,CH-5232 VILLIGEN,SWITZERLAND. NR 19 TC 30 Z9 30 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. 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RI Dressel, Martin/D-3244-2012 NR 56 TC 93 Z9 93 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1994 VL 50 IS 18 BP 13603 EP 13615 DI 10.1103/PhysRevB.50.13603 PG 13 WC Physics, Condensed Matter SC Physics GA PT410 UT WOS:A1994PT41000059 ER PT J AU WOOD, RF AF WOOD, RF TI CHARGE-TRANSFER AND BARRIER-LAYER EFFECTS IN YBA2CU3O7 SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Article ID NORMAL-STATE PROPERTIES; HIGH-TC SUPERCONDUCTORS; TRANSITION; PRBA2CU3O7; TEMPERATURE RP WOOD, RF (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. NR 30 TC 9 Z9 9 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1994 VL 50 IS 18 BP 13688 EP 13694 DI 10.1103/PhysRevB.50.13688 PG 7 WC Physics, Condensed Matter SC Physics GA PT410 UT WOS:A1994PT41000072 ER PT J AU LANG, JC WANG, XD HARMON, BN GOLDMAN, AI DENNIS, KW MCCALLUM, RW FINKELSTEIN, KD AF LANG, JC WANG, XD HARMON, BN GOLDMAN, AI DENNIS, KW MCCALLUM, RW FINKELSTEIN, KD TI ANGULAR-DEPENDENCE OF CIRCULAR MAGNETIC-X-RAY DICHROISM IN RARE-EARTH COMPOUNDS SO PHYSICAL REVIEW B LA English DT Note ID METAL; ABSORPTION C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. CORNELL UNIV,DEPT APPL ENGN PHYS,ITHACA,NY 14853. CORNELL UNIV,CORNELL HIGH ENERGY SYNCHROTRON SOURCE,ITHACA,NY 14853. NR 16 TC 9 Z9 9 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1994 VL 50 IS 18 BP 13805 EP 13808 DI 10.1103/PhysRevB.50.13805 PG 4 WC Physics, Condensed Matter SC Physics GA PT410 UT WOS:A1994PT41000090 ER PT J AU GOREMYCHKIN, EA OSBORN, R MUZYCHKA, AY AF GOREMYCHKIN, EA OSBORN, R MUZYCHKA, AY TI CRYSTAL-FIELD EFFECTS IN PRCU2SI2 - AN EVALUATION OF EVIDENCE FOR HEAVY-FERMION BEHAVIOR SO PHYSICAL REVIEW B LA English DT Note ID QUADRUPOLAR ANOMALIES; CECU2SI2 C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. JOINT INST NUCL RES DUBNA,IM FRANK LAB NEUTRON PHYS,MOSCOW,RUSSIA. RP GOREMYCHKIN, EA (reprint author), RUTHERFORD APPLETON LAB,DIV ISIS SCI,DIDCOT OX11 0QX,OXON,ENGLAND. RI Osborn, Raymond/E-8676-2011 OI Osborn, Raymond/0000-0001-9565-3140 NR 12 TC 14 Z9 14 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1994 VL 50 IS 18 BP 13863 EP 13866 DI 10.1103/PhysRevB.50.13863 PG 4 WC Physics, Condensed Matter SC Physics GA PT410 UT WOS:A1994PT41000105 ER PT J AU NYHUS, P KARLOW, MA COOPER, SL VEAL, BW PAULIKAS, AP AF NYHUS, P KARLOW, MA COOPER, SL VEAL, BW PAULIKAS, AP TI DYNAMICALLY ASSISTED INTERLAYER HOPPING IN YBA2CU3O6+X SO PHYSICAL REVIEW B LA English DT Note ID HIGH-TEMPERATURE SUPERCONDUCTORS; RESONANT RAMAN-SCATTERING; ELECTRONIC-STRUCTURE; RESISTIVITY; METALS; MODEL C1 UNIV ILLINOIS,FREDERICK SEITZ MAT RES LAB,URBANA,IL 61801. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP NYHUS, P (reprint author), UNIV ILLINOIS,DEPT PHYS,1110 W GREEN ST,URBANA,IL 61801, USA. NR 24 TC 29 Z9 30 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1994 VL 50 IS 18 BP 13898 EP 13901 DI 10.1103/PhysRevB.50.13898 PG 4 WC Physics, Condensed Matter SC Physics GA PT410 UT WOS:A1994PT41000114 ER PT J AU KREEK, SA HALL, HL GREGORICH, KE HENDERSON, RA LEYBA, JD CZERWINSKI, KR KADKHODAYAN, B NEU, MP KACHER, CD HAMILTON, TM LANE, MR SYLWESTER, ER TURLER, A LEE, DM NURMIA, MJ HOFFMAN, DC AF KREEK, SA HALL, HL GREGORICH, KE HENDERSON, RA LEYBA, JD CZERWINSKI, KR KADKHODAYAN, B NEU, MP KACHER, CD HAMILTON, TM LANE, MR SYLWESTER, ER TURLER, A LEE, DM NURMIA, MJ HOFFMAN, DC TI ELECTRON-CAPTURE DELAYED FISSION PROPERTIES OF NP-228 SO PHYSICAL REVIEW C LA English DT Article ID NUCLEAR-FISSION; BARRIER; MODEL C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RI Turler, Andreas/D-3913-2014; OI Turler, Andreas/0000-0002-4274-1056; Hall, Howard/0000-0002-4080-5159 NR 38 TC 17 Z9 17 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD NOV PY 1994 VL 50 IS 5 BP 2288 EP 2296 DI 10.1103/PhysRevC.50.2288 PG 9 WC Physics, Nuclear SC Physics GA PT406 UT WOS:A1994PT40600006 ER PT J AU SUN, Y FENG, DH WEN, SX AF SUN, Y FENG, DH WEN, SX TI VARIED SIGNATURE SPLITTING PHENOMENA IN ODD PROTON NUCLEI SO PHYSICAL REVIEW C LA English DT Article ID RARE-EARTH NUCLEI; ANGULAR-MOMENTUM PROJECTION; HIGH-SPIN STATES; QUANTUM NUMBER PROJECTION C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. CHINA INST ATOM ENERGY,BEIJING,PEOPLES R CHINA. RP SUN, Y (reprint author), DREXEL UNIV,DEPT PHYS & ATMOSPHER SCI,PHILADELPHIA,PA 19104, USA. RI Sun, Yang/P-2417-2015 NR 18 TC 14 Z9 16 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD NOV PY 1994 VL 50 IS 5 BP 2351 EP 2357 DI 10.1103/PhysRevC.50.2351 PG 7 WC Physics, Nuclear SC Physics GA PT406 UT WOS:A1994PT40600013 ER PT J AU WANG, L YANG, X RAPAPORT, J GOODMAN, CD FOSTER, CC WANG, Y PIEKAREWICZ, J SUGARBAKER, E MARCHLENSKI, D DELUCIA, S LUTHER, B RYBARCYK, L TADDEUCCI, TN PARK, BK AF WANG, L YANG, X RAPAPORT, J GOODMAN, CD FOSTER, CC WANG, Y PIEKAREWICZ, J SUGARBAKER, E MARCHLENSKI, D DELUCIA, S LUTHER, B RYBARCYK, L TADDEUCCI, TN PARK, BK TI (P,N) QUASI-FREE EXCITATIONS IN P-SHELL NUCLEI AT 186-MEV SO PHYSICAL REVIEW C LA English DT Article ID ISOVECTOR GIANT-RESONANCES; ELECTRON-SCATTERING; RESPONSE FUNCTIONS; SPIN OBSERVABLES; DELTA-RESONANCE; ELASTIC PEAK; PROTONS; REGION C1 INDIANA UNIV,CYCLOTRON FACIL,BLOOMINGTON,IN 47405. FLORIDA STATE UNIV,TALLAHASSEE,FL 32306. OHIO STATE UNIV,COLUMBUS,OH 43210. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NEW MEXICO STATE UNIV,LAS CRUCES,NM 88003. RP WANG, L (reprint author), OHIO UNIV,ATHENS,OH 45701, USA. NR 48 TC 16 Z9 16 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD NOV PY 1994 VL 50 IS 5 BP 2438 EP 2448 DI 10.1103/PhysRevC.50.2438 PG 11 WC Physics, Nuclear SC Physics GA PT406 UT WOS:A1994PT40600023 ER PT J AU CHADWICK, MB OBLOZINSKY, P AF CHADWICK, MB OBLOZINSKY, P TI CONTINUUM ANGULAR-DISTRIBUTIONS IN PREEQUILIBRIUM NUCLEAR-REACTIONS - PHYSICAL BASIS FOR KALBACH SYSTEMATICS SO PHYSICAL REVIEW C LA English DT Article ID GENERALIZED EXCITON MODEL; LINEAR MOMENTUM C1 INT ATOM ENERGY AGCY,NUCL DATA SECT,A-1400 VIENNA,AUSTRIA. RP CHADWICK, MB (reprint author), LAWRENCE LIVERMORE NATL LAB,NUCL DATA GRP,LIVERMORE,CA 94550, USA. NR 20 TC 41 Z9 41 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD NOV PY 1994 VL 50 IS 5 BP 2490 EP 2493 DI 10.1103/PhysRevC.50.2490 PG 4 WC Physics, Nuclear SC Physics GA PT406 UT WOS:A1994PT40600029 ER PT J AU LEE, IY BAKTASH, C CULLEN, DM GARRETT, JD JOHNSON, NR MCGOWAN, FK WINCHELL, DF YU, CH AF LEE, IY BAKTASH, C CULLEN, DM GARRETT, JD JOHNSON, NR MCGOWAN, FK WINCHELL, DF YU, CH TI LIFETIMES OF LOW-SPIN STATES IN THE SUPERDEFORMED BAND OF HG-192 SO PHYSICAL REVIEW C LA English DT Note ID NUCLEI; SPECTROSCOPY; DY-152; DECAY C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV TENNESSEE,KNOXVILLE,TN 37996. NR 21 TC 12 Z9 12 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD NOV PY 1994 VL 50 IS 5 BP 2602 EP 2605 DI 10.1103/PhysRevC.50.2602 PG 4 WC Physics, Nuclear SC Physics GA PT406 UT WOS:A1994PT40600040 ER PT J AU GILL, RL AF GILL, RL TI MEASUREMENT OF THE Q(BETA) VALUE FOR THE BETA-DECAY OF MASS SEPARATED AS-84-]SE-84 SO PHYSICAL REVIEW C LA English DT Note ID LIVED FISSION-PRODUCTS RP GILL, RL (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 11 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD NOV PY 1994 VL 50 IS 5 BP 2612 EP 2613 DI 10.1103/PhysRevC.50.2612 PG 2 WC Physics, Nuclear SC Physics GA PT406 UT WOS:A1994PT40600043 ER PT J AU ELOUADRHIRI, L MISKIMEN, RA BUTTONSHAFER, J DEGTYARENKO, P PETERSON, GA SHUVALOV, S WANG, K GAVRILOV, V DIETRICH, FS MELNIKOFF, SO MOLITORIS, JD VANBIBBER, K AF ELOUADRHIRI, L MISKIMEN, RA BUTTONSHAFER, J DEGTYARENKO, P PETERSON, GA SHUVALOV, S WANG, K GAVRILOV, V DIETRICH, FS MELNIKOFF, SO MOLITORIS, JD VANBIBBER, K TI MEASUREMENTS OF THE (E,E'P-PI(-)) REACTION ON NUCLEI IN THE NUCLEON RESONANCE REGION SO PHYSICAL REVIEW C LA English DT Note ID ELECTRON-SCATTERING; DELTA-RESONANCE; QUARK-MODEL; BARYONS C1 INST THEORET & EXPTL PHYS,MOSCOW 117259,RUSSIA. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP ELOUADRHIRI, L (reprint author), UNIV MASSACHUSETTS,DEPT PHYS & ASTRON,AMHERST,MA 01003, USA. NR 24 TC 4 Z9 4 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD NOV PY 1994 VL 50 IS 5 BP R2266 EP R2269 PG 4 WC Physics, Nuclear SC Physics GA PT406 UT WOS:A1994PT40600002 ER PT J AU ANDIVAHIS, L BOSTED, PE LUNG, A STUART, LM ALSTER, J ARNOLD, RG CHANG, CC DIETRICH, FS DODGE, W GEARHART, R GOMEZ, J GRIFFIOEN, KA HICKS, RS HYDEWRIGHT, CE KEPPEL, C KUHN, SE LICHTENSTADT, J MISKIMEN, RA PETERSON, GA PETRATOS, GG ROCK, SE ROKNI, S SAKUMOTO, WK SPENGOS, M SWARTZ, K SZALATA, Z TAO, LH AF ANDIVAHIS, L BOSTED, PE LUNG, A STUART, LM ALSTER, J ARNOLD, RG CHANG, CC DIETRICH, FS DODGE, W GEARHART, R GOMEZ, J GRIFFIOEN, KA HICKS, RS HYDEWRIGHT, CE KEPPEL, C KUHN, SE LICHTENSTADT, J MISKIMEN, RA PETERSON, GA PETRATOS, GG ROCK, SE ROKNI, S SAKUMOTO, WK SPENGOS, M SWARTZ, K SZALATA, Z TAO, LH TI MEASUREMENTS OF THE ELECTRIC AND MAGNETIC FORM-FACTORS OF THE PROTON FROM Q(2)=1.75 TO 8.83 (GEV/C)(2) SO PHYSICAL REVIEW D LA English DT Article ID LARGE-MOMENTUM-TRANSFER; SUPERCONVERGENT DISPERSION-RELATION; EXCLUSIVE PROCESSES; RESONANCE PHYSICS; QUANTUM CHROMODYNAMICS; QUARK DYNAMICS; SCALING LAWS; NUCLEON; SCATTERING; QCD AB The proton elastic form factors G(Ep)(Q(2)) and G(Mp)(Q(2)) have been extracted for Q(2) = 1.75 to 8.83 (GeV/c)(2) via a Rosenbluth separation to ep elastic cross section measurements in the angular range 13 degrees less than or equal to theta less than or equal to 90 degrees. The Q(2) range covered more than doubles that of the existing data. For Q(2) < 4 (GeV/c)(2), where the data overlap with previous measurements, the total uncertainties have been reduced to < 14% in G(Ep) and < 1.5% in G(Mp). Results for G(Ep)(Q(2)) are consistent with the dipole fit, G(D)(Q(2)) = (1 + Q(2)/0.71)(-2), while those for G(Mp)(Q(2))/mu(p)G(D)(Q(2)) decrease smoothly from 1.05 to 0.92. Deviations from form factor scaling are observed up to 20%. The ratio Q(2)F(2)/F-1 is observed to approach a constant value for Q(2) > 3 (GeV/c)(2). Comparisons are made to vector meson dominance, dimensional scaling, QCD sum rule, diquark, and constituent quark models, none of which fully characterize all the new data. C1 UNIV CALIF DAVIS, DAVIS, CA 95616 USA. CONTINUOUS ELECTRON BEAM ACCELERATOR FACIL CTR, NEWPORT NEWS, VA 23606 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. UNIV MARYLAND, COLLEGE PK, MD 20742 USA. UNIV MASSACHUSETTS, AMHERST, MA 01003 USA. NIST, GAITHERSBURG, MD 20899 USA. UNIV PENN, PHILADELPHIA, PA 19104 USA. UNIV ROCHESTER, ROCHESTER, NY 14627 USA. STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. TEL AVIV UNIV, IL-69978 TEL AVIV, ISRAEL. UNIV WASHINGTON, SEATTLE, WA 98195 USA. STANFORD UNIV, STANFORD, CA 94305 USA. RP AMERICAN UNIV, WASHINGTON, DC 20016 USA. NR 56 TC 272 Z9 272 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD NOV 1 PY 1994 VL 50 IS 9 BP 5491 EP 5517 DI 10.1103/PhysRevD.50.5491 PG 27 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PQ074 UT WOS:A1994PQ07400006 ER PT J AU ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BACCHETTA, N BADEN, AR BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CEN, Y CERVELLI, F CHADWICK, K CHAPMAN, J CHAPIN, TJ CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DICKSON, M DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, JAJ MATTINGLY, R MCCLURE, C MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PIACENTINO, AG PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPHICAS, P SPIES, A STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP YOH, J YOKOYAMA, M JUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S AF ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BACCHETTA, N BADEN, AR BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CEN, Y CERVELLI, F CHADWICK, K CHAPMAN, J CHAPIN, TJ CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DICKSON, M DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, JAJ MATTINGLY, R MCCLURE, C MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PIACENTINO, AG PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPHICAS, P SPIES, A STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP YOH, J YOKOYAMA, M JUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S TI MEASUREMENT OF SMALL-ANGLE ANTIPROTON-PROTON ELASTIC-SCATTERING AT ROOT-S=546 AND 1800 GEV SO PHYSICAL REVIEW D LA English DT Article ID INTERSECTING STORAGE-RINGS; OF-MASS ENERGY; PPBAR AB Antiproton-proton elastic scattering was measured at c.m.s. energies root s = 546 and 1800 GeV in the range of four-momentum transfer squared 0.025 < -t < 0.29 GeV2. The data are well described by the exponential form e(bt) with a slope b = 15.28 +/- 0.58 (16.98 +/- 0.25) GeV-2 at root s = 546 (1800) GeV. The elastic scattering cross sections are, respectively, sigma(el) = 12.87 +/- 0.30 and 19.70 +/- 0.85 mb. C1 BRANDEIS UNIV,WALTHAM,MA 02254. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV CHICAGO,CHICAGO,IL 60637. DUKE UNIV,DURHAM,NC 27706. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. HARVARD UNIV,CAMBRIDGE,MA 02138. UNIV ILLINOIS,URBANA,IL 61801. MCGILL UNIV,INST PARTICLE PHYS,MONTREAL,PQ,CANADA. UNIV TORONTO,TORONTO,ON,CANADA. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. UNIV MICHIGAN,ANN ARBOR,MI 48109. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. UNIV PADUA,IST NAZL FIS NUCL,SEZ PADOVA,I-35131 PADUA,ITALY. UNIV PENN,PHILADELPHIA,PA 19104. UNIV PITTSBURGH,PITTSBURGH,PA 15260. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14627. ROCKEFELLER UNIV,NEW YORK,NY 10021. RUTGERS STATE UNIV,PISCATAWAY,NJ 08854. TEXAS A&M UNIV,COLLEGE STN,TX 77843. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. TUFTS UNIV,MEDFORD,MA 02115. UNIV WISCONSIN,MADISON,WI 53706. RP ABE, F (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Warburton, Andreas/N-8028-2013; Kim, Soo-Bong/B-7061-2014 OI Chiarelli, Giorgio/0000-0001-9851-4816; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Warburton, Andreas/0000-0002-2298-7315; NR 14 TC 148 Z9 148 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD NOV 1 PY 1994 VL 50 IS 9 BP 5518 EP 5534 DI 10.1103/PhysRevD.50.5518 PG 17 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PQ074 UT WOS:A1994PQ07400007 ER PT J AU ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BACCHETTA, N BADEN, AR BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CEN, Y CERVELLI, F CHADWICK, K CHAPMAN, J CHAPIN, TJ CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, F DEVLIN, T DICKSON, M DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, A MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PIACENTINO, AG PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPHICAS, P SPIES, A STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, RL WOLINSKI, M WU, DY WU, X WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP JOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S AF ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BACCHETTA, N BADEN, AR BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CEN, Y CERVELLI, F CHADWICK, K CHAPMAN, J CHAPIN, TJ CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, F DEVLIN, T DICKSON, M DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, A MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PIACENTINO, AG PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPHICAS, P SPIES, A STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, RL WOLINSKI, M WU, DY WU, X WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP JOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S TI MEASUREMENT OF (P)OVER-BAR-P SINGLE DIFFRACTION DISSOCIATION AT ROOT-S=546 AND 1800 GEV SO PHYSICAL REVIEW D LA English DT Article ID DUAL PARTON MODEL; ELASTIC-SCATTERING; HIGH-ENERGY; EXCITATION; COLLIDER; ISR AB We report a measurement of the diffraction dissociation differential cross section d(2) sigma(SD)/dM(2)dt for ($) over bar pp --> ($) over bar pX at root s = 546 and 1800 GeV, M(2)/s < 0.2 and 0 less than or equal to -t less than or equal to 0.4 GeV2. Our results are compared to theoretical predictions and to extrapolations from experimental results at lower energies. C1 BRANDEIS UNIV,WALTHAM,MA 02254. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV CHICAGO,CHICAGO,IL 60637. DUKE UNIV,DURHAM,NC 27706. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. UNIV ILLINOIS,URBANA,IL 61801. MCGILL UNIV,INST PARTICLE PHYS,MONTREAL,PQ,CANADA. UNIV TORONTO,TORONTO,ON,CANADA. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. UNIV MICHIGAN,ANN ARBOR,MI 48109. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. UNIV PADUA,INST NAZL FIS NUCL,SEZ PADOVA,I-35131 PADUA,ITALY. UNIV PENN,PHILADELPHIA,PA 19104. UNIV PITTSBURGH,PITTSBURGH,PA 15260. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14627. ROCKEFELLER UNIV,NEW YORK,NY 10021. RUTGERS STATE UNIV,PISCATAWAY,NJ 08854. TEXAS A&M UNIV,COLLEGE STN,TX 77843. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. TUFTS UNIV,MEDFORD,MA 02155. UNIV WISCONSIN,MADISON,WI 53706. RP ABE, F (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Warburton, Andreas/N-8028-2013; Kim, Soo-Bong/B-7061-2014 OI Chiarelli, Giorgio/0000-0001-9851-4816; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Warburton, Andreas/0000-0002-2298-7315; NR 26 TC 142 Z9 142 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD NOV 1 PY 1994 VL 50 IS 9 BP 5535 EP 5549 DI 10.1103/PhysRevD.50.5535 PG 15 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PQ074 UT WOS:A1994PQ07400008 ER PT J AU ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BACCHETTA, N BADEN, AR BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CEN, Y CERVELLI, F CHADWICK, K CHAPMAN, J CHAPIN, TJ CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLANGELO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DICKSON, M DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C GRUNHAUS, J HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PIACENTINO, AG PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPHICAS, P SPIES, A STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S AF ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BACCHETTA, N BADEN, AR BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CEN, Y CERVELLI, F CHADWICK, K CHAPMAN, J CHAPIN, TJ CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLANGELO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DICKSON, M DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C GRUNHAUS, J HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PIACENTINO, AG PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPHICAS, P SPIES, A STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S TI MEASUREMENT OF THE ANTIPROTON-PROTON TOTAL CROSS-SECTION AT ROOT-S=546 AND 1800 GEV SO PHYSICAL REVIEW D LA English DT Article ID S = 630; ELASTIC-SCATTERING; PSEUDORAPIDITY DISTRIBUTIONS; GEV-C; ENERGIES; TEV; DEUTERONS; PBAR AB We report a measurement of the proton-antiproton total cross section sigma(T) at c.m.s. energies root s = 546 and 1800 GeV. Using the luminosity-independent method, we find sigma(T) = 61.26 +/- 0.93 mb at root s = 546 GeV and 80.03 +/- 2.24 mb at root s = 1800 GeV. In this energy range, the ratio sigma(el)/sigma(T) increases from 0.210 +/- 0.002 to 0.246 +/- 0.004. C1 BRANDEIS UNIV,WALTHAM,MA 02254. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV CHICAGO,CHICAGO,IL 60637. DUKE UNIV,DURHAM,NC 27706. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. HARVARD UNIV,CAMBRIDGE,MA 02138. UNIV ILLINOIS,URBANA,IL 61801. MCGILL UNIV,INST PARTICLE PHYS,MONTREAL,PQ,CANADA. UNIV TORONTO,TORONTO,ON,CANADA. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. UNIV MICHIGAN,ANN ARBOR,MI 48109. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. UNIV PADUA,IST NAZL FIS NUCL,SEZ PADOVA,I-35131 PADUA,ITALY. UNIV PENN,PHILADELPHIA,PA 19104. UNIV PITTSBURGH,PITTSBURGH,PA 15260. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14627. ROCKEFELLER UNIV,NEW YORK,NY 10021. RUTGERS STATE UNIV,PISCATAWAY,NJ 08854. TEXAS A&M UNIV,COLLEGE STN,TX 77843. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. TUFTS UNIV,MEDFORD,MA 02155. UNIV WISCONSIN,MADISON,WI 53706. RP ABE, F (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Warburton, Andreas/N-8028-2013; Kim, Soo-Bong/B-7061-2014 OI Chiarelli, Giorgio/0000-0001-9851-4816; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Warburton, Andreas/0000-0002-2298-7315; NR 33 TC 212 Z9 212 U1 1 U2 4 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 NOV 1 PY 1994 VL 50 IS 9 BP 5550 EP 5561 DI 10.1103/PhysRevD.50.5550 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PQ074 UT WOS:A1994PQ07400009 ER PT J AU ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BACCHETTA, N BADEN, AR BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BARTALINI, P BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CEN, Y CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DICKSON, M DONATI, S DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GAGLIARDI, G GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMAN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, R HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, L KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAGLIARONE, C PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PIACENTINO, AG PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPHICAS, P SPIES, A STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YAO, W YASUOKA, K YE, Y YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S AF ABE, F ALBROW, M AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P AZZI, P BACCHETTA, N BADEN, AR BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BARTALINI, P BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CEN, Y CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DICKSON, M DONATI, S DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FRAUTSCHI, M FELDMAN, GJ FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GAGLIARDI, G GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GONZALEZ, J GOULIANOS, K GRASSMAN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, R HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLSCHER, A HONG, S HOUK, G HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, L KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MENZIONE, A MESCHI, E MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAGLIARONE, C PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PIACENTINO, AG PLUNKETT, R PONDROM, L PROUDFOOT, J PTOHOS, F PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCIACCA, G SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPHICAS, P SPIES, A STDENIS, R STANCO, L STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSAY, Y TSENG, J TURINI, N UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WALSH, J WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YAO, W YASUOKA, K YE, Y YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZHANG, W ZUCCHELLI, S TI EVIDENCE FOR COLOR COHERENCE IN P(P)OVER-BAR COLLISIONS AT ROOT-S=1.8 TEV SO PHYSICAL REVIEW D LA English DT Article ID LUND MONTE-CARLO; PARTON-PARTON SCATTERING; E+E ANNIHILATION; 3-JET EVENTS; QCD COHERENCE; PERTURBATIVE QCD; PBARP COLLISIONS; CROSS-SECTION; TESTS; FRAGMENTATION AB Color coherence effects in p ($) over bar p collisions are observed and studied with CDF, the Collider Detector at the Fermilab Tevatron collider. We demonstrate these effects by measuring spatial correlations between soft and leading jets in multijet events. Variables sensitive to interference are identified by comparing the data to the predictions of various shower Monte Carlo programs that are substantially different with respect to the implementation of coherence. C1 BRANDEIS UNIV,WALTHAM,MA 02254. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV CHICAGO,CHICAGO,IL 60637. DUKE UNIV,DURHAM,NC 27706. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. HARVARD UNIV,CAMBRIDGE,MA 02138. UNIV ILLINOIS,URBANA,IL 61801. MCGILL UNIV,INST PARTICLE PHYS,MONTREAL H3A 2T8,PQ,CANADA. UNIV TORONTO,TORONTO M5S 1A7,ON,CANADA. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. NATL LAB HIGH ENERGY PHYS,KEK,TSUKUBA,IBARAKI 305,JAPAN. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. UNIV MICHIGAN,ANN ARBOR,MI 48109. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. UNIV PADUA,INST NAZL FIS NUCL,SEZ PADOVA,I-35131 PADUA,ITALY. UNIV PENN,PHILADELPHIA,PA 19104. UNIV PITTSBURGH,PITTSBURGH,PA 15260. UNIV PISA,IST NAZL FIS NUCL,I-56100 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV ROCHESTER,ROCHESTER,NY 14627. ROCKEFELLER UNIV,NEW YORK,NY 10021. RUTGERS STATE UNIV,PISCATAWAY,NJ 08854. TEXAS A&M UNIV,COLLEGE STN,TX 77843. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. TUFTS UNIV,MEDFORD,MA 02155. UNIV WISCONSIN,MADISON,WI 53706. RP ABE, F (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Warburton, Andreas/N-8028-2013; Kim, Soo-Bong/B-7061-2014 OI Chiarelli, Giorgio/0000-0001-9851-4816; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Warburton, Andreas/0000-0002-2298-7315; NR 43 TC 42 Z9 42 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD NOV 1 PY 1994 VL 50 IS 9 BP 5562 EP 5579 DI 10.1103/PhysRevD.50.5562 PG 18 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PQ074 UT WOS:A1994PQ07400010 ER PT J AU ABE, K ABT, I ASH, WW ASTON, D BACCHETTA, N BAIRD, KG BALTAY, C BAND, HR BARAKAT, MB BARANKO, G BARDON, O BARKLOW, T BAZARKO, AO BENDAVID, R BENVENUTI, AC BIENZ, T BILEI, GM BISELLO, D BLAYLOCK, G BOGART, JR BOLTON, T BOWER, GR BRAU, JE BREIDENBACH, M BUGG, WM BURKE, D BURNETT, TH BURROWS, PN BUSZA, W CALCATERRA, A CALDWELL, DO CALLOWAY, D CAMANZI, B CARPINELLI, M CASSELL, R CASTALDI, R CASTRO, A CAVALLISFORZA, M CHURCH, E COHN, HO COLLER, JA COOK, V COTTON, R COWAN, RF COYNE, DG DOLIVEIRA, A DAMERELL, CJS DASU, S DESANGRO, R DESIMONE, P DELLORSO, R DU, YC DUBOIS, R EISENSTEIN, BI ELIA, R FAN, C FERO, MJ FREY, R FURUNO, K GILLMAN, T GLADDING, G GONZALEZ, S HALLEWELL, GD HART, EL HASEGAWA, Y HEDGES, S HERTZBACH, SS HILDRETH, MD HUBER, J HUFFER, ME HUGHES, EW HWANG, H IWASAKI, Y JACQUES, P JAROS, J JOHNSON, AS JOHNSON, JR JOHNSON, RA JUNK, T KAJIKAWA, R KALELKAR, M KARLINER, I KAWAHARA, H KENDALL, HW KING, ME KING, R KOFLER, RR KRISHNA, NM KROEGER, RS KWON, Y LABS, JF LANGSTON, M LATH, A LAUBER, JA LEITH, DWG LIU, X LORETI, M LU, A LYNCH, HL MA, J MANCINELLI, G MANLY, S MANTOVANI, G MARKIEWICZ, TW MARUYAMA, T MASUDA, H MAZZUCATO, E MCKEMEY, AK MEADOWS, BT MESSNER, R MOCKETT, PM MOFFEIT, KC MOURS, B MULLER, G MULLER, D NAGAMINE, T NAUENBERG, U NEAL, H NUSSBAUM, M OSBORNE, LS PANVINI, RS PARK, H PAVEL, TJ PERUZZI, I PESCARA, L PICCOLO, M PIEMONTESE, L PIERONI, E PITTS, KT PLANO, RJ PREPOST, R PRESCOTT, CY PUNKAR, GD QUIGLEY, J RATCLIFF, BN REEVES, TW RENSING, PE ROCHESTER, LS ROTHBERG, JE ROWSON, PC RUSSELL, JJ SAXTON, OH SCHALK, T SCHINDLER, RH SCHNEEKLOTH, U SCHUMM, BA SEIDEN, A SEN, S SHAEVITZ, MH SHANK, JT SHAPIRO, G SHERDEN, DJ SIMOPOULOS, C SMITH, SR SNYDER, JA STAMER, P STEINER, H STEINER, R STRAUSS, MG SU, D SUEKANE, F SUGIYAMA, A SUZUKI, S SWARTZ, M SZUMILO, A TAKAHASHI, T TAYLOR, FE TORRENCE, E TURK, JD USHER, T VAVRA, J VANNINI, C VELLA, E VENUTI, JP VERDINI, PG WAGNER, SR WAITE, AP WATTS, SJ WEIDEMANN, AW WHITAKER, JS WHITE, SL WICKENS, FJ WILLIAMS, DA WILLIAMS, DC WILLIAMS, SH WILLOCQ, S WILSON, RJ WISNIEWSKI, WJ WOODS, M WORD, GB WYSS, J YAMAMOTO, RK YAMARTINO, JM YELLIN, SJ YOUNG, CC YUTA, H ZAPALAC, G ZDARKO, RW ZEITLIN, C ZHOU, J AF ABE, K ABT, I ASH, WW ASTON, D BACCHETTA, N BAIRD, KG BALTAY, C BAND, HR BARAKAT, MB BARANKO, G BARDON, O BARKLOW, T BAZARKO, AO BENDAVID, R BENVENUTI, AC BIENZ, T BILEI, GM BISELLO, D BLAYLOCK, G BOGART, JR BOLTON, T BOWER, GR BRAU, JE BREIDENBACH, M BUGG, WM BURKE, D BURNETT, TH BURROWS, PN BUSZA, W CALCATERRA, A CALDWELL, DO CALLOWAY, D CAMANZI, B CARPINELLI, M CASSELL, R CASTALDI, R CASTRO, A CAVALLISFORZA, M CHURCH, E COHN, HO COLLER, JA COOK, V COTTON, R COWAN, RF COYNE, DG DOLIVEIRA, A DAMERELL, CJS DASU, S DESANGRO, R DESIMONE, P DELLORSO, R DU, YC DUBOIS, R EISENSTEIN, BI ELIA, R FAN, C FERO, MJ FREY, R FURUNO, K GILLMAN, T GLADDING, G GONZALEZ, S HALLEWELL, GD HART, EL HASEGAWA, Y HEDGES, S HERTZBACH, SS HILDRETH, MD HUBER, J HUFFER, ME HUGHES, EW HWANG, H IWASAKI, Y JACQUES, P JAROS, J JOHNSON, AS JOHNSON, JR JOHNSON, RA JUNK, T KAJIKAWA, R KALELKAR, M KARLINER, I KAWAHARA, H KENDALL, HW KING, ME KING, R KOFLER, RR KRISHNA, NM KROEGER, RS KWON, Y LABS, JF LANGSTON, M LATH, A LAUBER, JA LEITH, DWG LIU, X LORETI, M LU, A LYNCH, HL MA, J MANCINELLI, G MANLY, S MANTOVANI, G MARKIEWICZ, TW MARUYAMA, T MASUDA, H MAZZUCATO, E MCKEMEY, AK MEADOWS, BT MESSNER, R MOCKETT, PM MOFFEIT, KC MOURS, B MULLER, G MULLER, D NAGAMINE, T NAUENBERG, U NEAL, H NUSSBAUM, M OSBORNE, LS PANVINI, RS PARK, H PAVEL, TJ PERUZZI, I PESCARA, L PICCOLO, M PIEMONTESE, L PIERONI, E PITTS, KT PLANO, RJ PREPOST, R PRESCOTT, CY PUNKAR, GD QUIGLEY, J RATCLIFF, BN REEVES, TW RENSING, PE ROCHESTER, LS ROTHBERG, JE ROWSON, PC RUSSELL, JJ SAXTON, OH SCHALK, T SCHINDLER, RH SCHNEEKLOTH, U SCHUMM, BA SEIDEN, A SEN, S SHAEVITZ, MH SHANK, JT SHAPIRO, G SHERDEN, DJ SIMOPOULOS, C SMITH, SR SNYDER, JA STAMER, P STEINER, H STEINER, R STRAUSS, MG SU, D SUEKANE, F SUGIYAMA, A SUZUKI, S SWARTZ, M SZUMILO, A TAKAHASHI, T TAYLOR, FE TORRENCE, E TURK, JD USHER, T VAVRA, J VANNINI, C VELLA, E VENUTI, JP VERDINI, PG WAGNER, SR WAITE, AP WATTS, SJ WEIDEMANN, AW WHITAKER, JS WHITE, SL WICKENS, FJ WILLIAMS, DA WILLIAMS, DC WILLIAMS, SH WILLOCQ, S WILSON, RJ WISNIEWSKI, WJ WOODS, M WORD, GB WYSS, J YAMAMOTO, RK YAMARTINO, JM YELLIN, SJ YOUNG, CC YUTA, H ZAPALAC, G ZDARKO, RW ZEITLIN, C ZHOU, J TI MEASUREMENT OF ALPHA(S) FROM ENERGY-ENERGY CORRELATIONS AT THE Z(0) RESONANCE SO PHYSICAL REVIEW D LA English DT Article ID ELECTRON-POSITRON ANNIHILATION; FREE PERTURBATION-THEORY; HADRONIC Z-DECAYS; QUANTUM CHROMODYNAMICS; E+E ANNIHILATION; MONTE-CARLO; LEP; QCD; DETECTOR; JETS AB We determine the strong coupling alpha(s) from a comprehensive study of energy-energy correlations (EEC) and their asymmetry (AEEC) in hadronic decays of Z(0) bosons collected by the SLD experiment at SLAC. The data are compared with all four available predictions of QCD calculated up to O(alpha(s)(2)) in perturbation theory, and also with a resummed calculation matched to all four of these calculations. We find large discrepancies between alpha(s) values extracted from the different O(alpha(s)(2)) calculations. We also find a large renormalization scale ambiguity in alpha(s) determined from the EEC using the O(alpha(s)(2)) calculations; this ambiguity is reduced in the case of the AEEC and is very small when the matched calculations are used. Averaging over all calculation, and over the EEC and AEEC results, we obtain alpha(s)(M(Z)(2)) = 0.124(-0.004)(+0.003)(expt.)+/-0.009(theory). C1 INFN,SEZ BOLOGNA,I-40126 BOLOGNA,ITALY. BOSTON UNIV,BOSTON,MA 02215. BRUNEL UNIV,UXBRIDGE UB8 3PH,MIDDX,ENGLAND. CALTECH,PASADENA,CA 91125. UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106. UNIV CALIF SANTA CRUZ,SANTA CRUZ,CA 95064. UNIV CINCINNATI,CINCINNATI,OH 45221. UNIV COLORADO,BOULDER,CO 80309. COLUMBIA UNIV,NEW YORK,NY 10027. INFN,SEZ FERRARA,I-44100 FERRARA,ITALY. UNIV FERRARA,I-44100 FERRARA,ITALY. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. UNIV ILLINOIS,URBANA,IL 61801. KEK NAT LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MIT,CAMBRIDGE,MA 02139. UNIV MASSACHUSETTS,AMHERST,MA 01003. NAGOYA UNIV,CHIKUSA KU,NAGOYA,AICHI 464,JAPAN. UNIV OREGON,EUGENE,OR 97403. IST NAZL FIS NUCL,SEZ PADOVA,I-35100 PADUA,ITALY. UNIV PADUA,I-35100 PADUA,ITALY. IST NAZL FIS NUCL,SEZ PERUGIA,I-06100 PERUGIA,ITALY. UNIV PERUGIA,I-06100 PERUGIA,ITALY. IST NAZL FIS NUCL,SEZ PISA,I-56100 PISA,ITALY. UNIV PISA,I-56100 PISA,ITALY. RUTGERS STATE UNIV,PISCATAWAY,NJ 08855. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. UNIV TENNESSEE,KNOXVILLE,TN 37996. VANDERBILT UNIV,NASHVILLE,TN 37235. UNIV WISCONSIN,MADISON,WI 53706. UNIV WASHINGTON,SEATTLE,WA 98195. YALE UNIV,NEW HAVEN,CT 06511. RP ABE, K (reprint author), ADELPHI UNIV,GARDEN CITY,NY 11530, USA. RI de Sangro, Riccardo/J-2901-2012; de Simone, Patrizia/J-3549-2012; Cavalli-Sforza, Matteo/H-7102-2015; Frey, Raymond/E-2830-2016; Calcaterra, Alessandro/P-5260-2015; OI Wyss, Jeffery/0000-0002-8277-4012; Wilson, Robert/0000-0002-8184-4103; de Sangro, Riccardo/0000-0002-3808-5455; Frey, Raymond/0000-0003-0341-2636; Calcaterra, Alessandro/0000-0003-2670-4826; pieroni, enrico/0000-0002-4246-6963 NR 39 TC 12 Z9 12 U1 0 U2 3 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 NOV 1 PY 1994 VL 50 IS 9 BP 5580 EP 5590 DI 10.1103/PhysRevD.50.5580 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PQ074 UT WOS:A1994PQ07400011 ER PT J AU RIZZO, TG AF RIZZO, TG TI SINGLE W-R PRODUCTION IN E(-)E(-)-COLLISIONS AT THE NEXT LINEAR COLLIDER SO PHYSICAL REVIEW D LA English DT Article ID RIGHT-HANDED CURRENTS; DOUBLE-BETA-DECAY; SEARCH; MASS; ENERGIES; SCALE AB Single W-R production in e(-)e(-) collisions at the NLC can be used to probe the Majorana nature of the heavy neutrinos present in the left-right symmetric model below the kinematic threshold for their direct production. For colliders in the root s = 1 - 1.5 TeV range, typical cross sections of order 1-10 fb are obtained, depending on the specific choice of model parameters. Backgrounds arising from standard model processes are shown to be small. This analysis greatly extends the kinematic range of previous studies wherein the production of an on-shell, like-sign pair of W-R's at the NLC was considered. RP STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. NR 33 TC 16 Z9 16 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD NOV 1 PY 1994 VL 50 IS 9 BP 5602 EP 5606 DI 10.1103/PhysRevD.50.5602 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PQ074 UT WOS:A1994PQ07400013 ER PT J AU FLEMING, S AF FLEMING, S TI J/PSI PRODUCTION FROM ELECTROMAGNETIC FRAGMENTATION IN Z(0) DECAY SO PHYSICAL REVIEW D LA English DT Article ID QUARK FRAGMENTATION; ORDER; QCD AB The rate for Z(o)-->J/psi+l(+)l(-) is surprisingly large with about one event for every million Z(o) decays. The reason for this is that there is a fragmentation contribution that is not suppressed by a factor of M(psi)(2)/M(Z)(2). In the fragmentation limit M(z)-->infinity with E(psi)/M(z) fixed, the differential decay rate for Z(o)-->J/psi+l(+)l(-) factors into electromagnetic decay rates and universal fragmentation functions. The fragmentation functibns for lepton fragmentation and photon fragmentation into J/psi are calculated to lowest order in alpha. The fragmentation approximation to the rate is shown to match the full calculation for E(psi) greater than about 3M(psi). C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP FLEMING, S (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. RI Fleming, Sean/C-3677-2015 OI Fleming, Sean/0000-0002-9553-7198 NR 15 TC 16 Z9 16 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD NOV 1 PY 1994 VL 50 IS 9 BP 5808 EP 5815 DI 10.1103/PhysRevD.50.5808 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PQ074 UT WOS:A1994PQ07400035 ER PT J AU DOREY, N HUGHES, J MATTIS, MP AF DOREY, N HUGHES, J MATTIS, MP TI SKYRMION QUANTITATION AND THE DECAY OF THE DELTA SO PHYSICAL REVIEW D LA English DT Article ID PI-N-SCATTERING; MESON SOLITON SCATTERING; = JT RULE; NUCLEON SCATTERING; NONRIGID QUANTIZATION; PERTURBATION-THEORY; YUKAWA COUPLINGS; NONLINEAR-WAVES; BORN AMPLITUDES; MODEL AB We present the complete solution to the so-called ''Yukawa problem'' of the Skyrme model. This refers to the perceived difficulty of reproducing, purely from soliton physics, the usual pseudovector pion-nucleon coupling, echoed by pion coupling to the higher-spin/isospin baryons (I=J=3/2,3/2,...,N-c/2) in a manner fixed by large-N-c group theory. The solution involves surprisingly elegant interplay between the classical and quantum properties of a new configuration: the rotationally improved Skyrmion. This is the near-hedgehog solution obtained by minimizing the usual Skyrmion mass functional augmented by an all-important (iso)rotational kinetic term. The numerics are pleasing: a Delta decay width within a few MeV of its measured value, and, furthermore, the higher-spin baryons (I=J greater than or equal to 5/2) with widths so large (Gamma > 800 MeV) that these undesirable large-N-c artifacts effectively drop out of the spectrum, and pose no phenomenological problem. Beyond these specific results, we ground the Skyrme model in the Feynman path integral, and set up a transparent collective coordinate formalism that makes maximal use of the 1/N-c expansion. This approach elucidates the connection between Skyrmions on the one hand, and Feynman diagrams in an effective held theory on the other. C1 MICHIGAN STATE UNIV, DEPT PHYS, E LANSING, MI 48823 USA. LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. RP UNIV COLL SWANSEA, DEPT PHYS, SWANSEA SA2 8PP, W GLAM, WALES. NR 82 TC 40 Z9 40 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD NOV 1 PY 1994 VL 50 IS 9 BP 5816 EP 5833 DI 10.1103/PhysRevD.50.5816 PG 18 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PQ074 UT WOS:A1994PQ07400036 ER PT J AU PAPAVASSILIOU, J SIRLIN, A AF PAPAVASSILIOU, J SIRLIN, A TI RENORMALIZABLE-W SELF-ENERGY IN THE UNITARY GAUGE VIA THE PINCH TECHNIQUE SO PHYSICAL REVIEW D LA English DT Article ID STANDARD MODEL; ELECTROWEAK CORRECTIONS; RADIATIVE-CORRECTIONS; WEAK-INTERACTIONS; FORMULATION; VERTEX; VERTICES AB We use the S-matrix pinch technique to derive to one loop order an effective renormalizable self-energy for the W gauge boson, when the theory is quantized in the unitary gauge. We then show that this amplitude is identical to the xi-independent W self-energy previously constructed by applying the pinch technique in the context of the renormalizable R(xi) gauges. C1 BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. NYU, DEPT PHYS, NEW YORK, NY 10003 USA. RP NYU, DEPT PHYS, 4 WASHINGTON PL, NEW YORK, NY 10003 USA. RI Papavassiliou, Joannis/K-3973-2014 OI Papavassiliou, Joannis/0000-0003-3958-8174 NR 23 TC 29 Z9 29 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD NOV 1 PY 1994 VL 50 IS 9 BP 5951 EP 5957 DI 10.1103/PhysRevD.50.5951 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PQ074 UT WOS:A1994PQ07400050 ER PT J AU BALTZ, AJ WENESER, J AF BALTZ, AJ WENESER, J TI IMPLICATION OF GALLIUM RESULTS ON THE POSSIBILITY OF OBSERVING DAY-NIGHT MATTER OSCILLATIONS AT SNO, SUPER-KAMIOKANDE, AND BOREXINO SO PHYSICAL REVIEW D LA English DT Article ID SOLAR NEUTRINO PROBLEM; II DETECTOR; REAL-TIME; HELIOSEISMOLOGY; GALLEX; MODELS; EARTH; FLUX; SUN AB Calculations are presented to determine what real time day-night effects would be observable at SNO, Super-Kamiokande, or Borexino for the Delta m(2), sin(2)2 theta space allowed by the present gallium, Cl-37, and Kamiokande solar neutrino results. We show that the combination of possible day-night effects and the observation of overall neutrino detection rates in the upcoming experiments might allow discrimination between the allowed regions of mass and mixing parameters. Approximate analytical expressions for the real time MSW effect in the Earth are presented to clarify the nature of electron-neutrino regeneration as a function of path length through the Earth. We point out that even for the allowed small sin(2)2 theta MSW solution, it might be possible to detect a day-night effect for neutrino trajectories through the core of the Earth. RP BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. NR 29 TC 40 Z9 40 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD NOV 1 PY 1994 VL 50 IS 9 BP 5971 EP 5979 DI 10.1103/PhysRevD.50.5971 PG 9 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PQ074 UT WOS:A1994PQ07400052 ER PT J AU TAMAYO, P ALEXANDER, FJ GUPTA, R AF TAMAYO, P ALEXANDER, FJ GUPTA, R TI 2-TEMPERATURE NONEQUILIBRIUM ISING-MODELS - CRITICAL-BEHAVIOR AND UNIVERSALITY SO PHYSICAL REVIEW E LA English DT Article ID LOCALLY COMPETING TEMPERATURES; DRIVEN DIFFUSIVE SYSTEMS; PHASE-TRANSITIONS; STEADY-STATES; DYNAMICS; EQUILIBRIUM; LATTICE C1 THINKING MACHINES CORP,CAMBRIDGE,MA 02142. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP TAMAYO, P (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,MS-B285,LOS ALAMOS,NM 87545, USA. NR 29 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 1063-651X J9 PHYS REV E JI Phys. Rev. E PD NOV PY 1994 VL 50 IS 5 BP 3474 EP 3484 DI 10.1103/PhysRevE.50.3474 PG 11 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA PV863 UT WOS:A1994PV86300036 ER PT J AU BINDER, PM AF BINDER, PM TI EFFECTS OF STRUCTURE ON TRANSPORT-COEFFICIENTS IN A RANDOM MEDIUM SO PHYSICAL REVIEW E LA English DT Article ID STATIONARY RANDOM-MEDIA; LONG-TIME TAILS; DISORDERED MEDIA; DIFFUSION; MODELS; GAS C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP BINDER, PM (reprint author), SANTA FE INST,1399 HYDE PK RD,SANTA FE,NM 87501, USA. NR 15 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD NOV PY 1994 VL 50 IS 5 BP 3586 EP 3588 DI 10.1103/PhysRevE.50.3586 PG 3 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA PV863 UT WOS:A1994PV86300049 ER PT J AU BENNETT, GR WARK, JS HEADING, DJ WOOLSEY, NC HE, H CAUBLE, R LEE, RW YOUNG, P AF BENNETT, GR WARK, JS HEADING, DJ WOOLSEY, NC HE, H CAUBLE, R LEE, RW YOUNG, P TI PRODUCTION OF STRONGLY COUPLED PLASMAS BY THE LASER IRRADIATION OF THIN METALLIC-FILMS CONFINED WITHIN MICROMETER-SCALE GAPS BY TRANSPARENT INSULATORS SO PHYSICAL REVIEW E LA English DT Article ID STRESS WAVES; OPACITY C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP BENNETT, GR (reprint author), UNIV OXFORD,DEPT PHYS,CLARENDON LAB,PK RD,OXFORD OX1 3PU,ENGLAND. NR 27 TC 9 Z9 9 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD NOV PY 1994 VL 50 IS 5 BP 3935 EP 3942 DI 10.1103/PhysRevE.50.3935 PG 8 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA PV863 UT WOS:A1994PV86300086 ER PT J AU BLASKIEWICZ, M WENG, WT AF BLASKIEWICZ, M WENG, WT TI EFFECT OF SPACE-CHARGE ON TRANSVERSE INSTABILITIES IN SYNCHROTRONS SO PHYSICAL REVIEW E LA English DT Article RP BLASKIEWICZ, M (reprint author), BROOKHAVEN NATL LAB,DEPT AGS,POB 5000,UPTON,NY 11973, USA. NR 11 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 1063-651X J9 PHYS REV E JI Phys. Rev. E PD NOV PY 1994 VL 50 IS 5 BP 4030 EP 4040 DI 10.1103/PhysRevE.50.4030 PG 11 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA PV863 UT WOS:A1994PV86300098 ER PT J AU ELLISON, M BALL, M BRABSON, B BUDNICK, J CAUSSYN, DD CHAO, AW DERENCHUK, V DUTT, S EAST, G FRIESEL, D HAMILTON, B HUANG, H JONES, WP LEE, SY LI, D MINTY, MG NG, KY PEI, X RIABKO, A SLOAN, T SYPHERS, M WANG, Y YAN, Y ZHANG, PL AF ELLISON, M BALL, M BRABSON, B BUDNICK, J CAUSSYN, DD CHAO, AW DERENCHUK, V DUTT, S EAST, G FRIESEL, D HAMILTON, B HUANG, H JONES, WP LEE, SY LI, D MINTY, MG NG, KY PEI, X RIABKO, A SLOAN, T SYPHERS, M WANG, Y YAN, Y ZHANG, PL TI EXPERIMENTAL MEASUREMENTS OF A BETATRON DIFFERENCE RESONANCE SO PHYSICAL REVIEW E LA English DT Article ID DYNAMICS C1 SUPERCONDUCTING SUPER COLLIDER LAB,DALLAS,TX 75237. STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. FARMILAB,BATAVIA,IL 60510. RP ELLISON, M (reprint author), INDIANA UNIV,CYCLOTRON FACIL,BLOOMINGTON,IN 47405, USA. NR 22 TC 10 Z9 10 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD NOV PY 1994 VL 50 IS 5 BP 4051 EP 4062 DI 10.1103/PhysRevE.50.4051 PG 12 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA PV863 UT WOS:A1994PV86300100 ER PT J AU LIU, JY BALL, M BRABSON, B BUDNICK, J CAUSSYN, DD EAST, G ELLISON, M HAMILTON, B JONES, WP KANG, X LEE, SY LI, D NG, KY RIABKO, A RICH, D SLOAN, T WANG, L AF LIU, JY BALL, M BRABSON, B BUDNICK, J CAUSSYN, DD EAST, G ELLISON, M HAMILTON, B JONES, WP KANG, X LEE, SY LI, D NG, KY RIABKO, A RICH, D SLOAN, T WANG, L TI BIFURCATION OF RESONANCE ISLANDS AND LANDAU DAMPING IN THE DOUBLE-RF SYSTEM SO PHYSICAL REVIEW E LA English DT Note ID MODULATION C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP LIU, JY (reprint author), INDIANA UNIV,CYCLOTRON FACIL,BLOOMINGTON,IN 47405, USA. NR 16 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD NOV PY 1994 VL 50 IS 5 BP R3349 EP R3352 PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA PV863 UT WOS:A1994PV86300017 ER PT J AU BUDZINSKI, JM BENJAMIN, RF AF BUDZINSKI, JM BENJAMIN, RF TI INFLUENCE OF INITIAL CONDITIONS ON THE FLOW PATTERNS OF A SHOCK-ACCELERATED THIN FLUID LAYER SO PHYSICS OF FLUIDS LA English DT Letter ID RICHTMYER-MESHKOV INSTABILITY; GAS AB Previous observations of three flow patterns generated by shock acceleration of a thin perturbed, fluid layer are now correlated with asymmetries in the initial conditions. Using a different diagnostic (planar laser Rayleigh scattering) than the previous experiments, upstream mushrooms, downstream mushrooms, and sinuous patterns are still observed, For each experiment the initial perturbation amplitude on one side of the layer can either be larger, smaller, or the same as the amplitude on the other side, as observed with two images per experiment, and these differences lead to the formation of the different patterns. C1 UNIV ARIZONA,DEPT AEROSP & MECH ENGN,TUCSON,AZ 85721. RP BUDZINSKI, JM (reprint author), LOS ALAMOS NATL LAB,DIV DYNAM EXPERIMENTAT,LOS ALAMOS,NM 87545, USA. NR 14 TC 35 Z9 36 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD NOV PY 1994 VL 6 IS 11 BP 3510 EP 3512 DI 10.1063/1.868447 PG 3 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA PP475 UT WOS:A1994PP47500002 ER PT J AU LILJEGREN, LM AF LILJEGREN, LM TI THE DISSIPATION RATE OF FLUCTUATING KINETIC-ENERGY IN A FLUID-SOLID FLOW SO PHYSICS OF FLUIDS LA English DT Note ID TURBULENCE AB An analysis is performed to determine the relationship between the Taylor microscale for total velocity and the dissipation rate for fluctuating kinetic energy in a fluid-solid mixture. RP LILJEGREN, LM (reprint author), PACIFIC NW LAB, FLUID DYNAM LAB, DEPT ANALYT SCI, BATTELLE BLVD,MSIN K7-15, RICHLAND, WA 99352 USA. NR 9 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 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD NOV PY 1994 VL 6 IS 11 BP 3795 EP 3797 DI 10.1063/1.868369 PG 3 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA PP475 UT WOS:A1994PP47500031 ER PT J AU VU, HX WALLACE, JM BEZZERIDES, B AF VU, HX WALLACE, JM BEZZERIDES, B TI AN ANALYTICAL AND NUMERICAL INVESTIGATION OF ION-ACOUSTIC-WAVES IN A 2-ION PLASMA SO PHYSICS OF PLASMAS LA English DT Article AB The ion acoustic dispersion relation for a plasma containing two distinct ion species is investigated over a wide range of plasma conditions. An approximate general analytic solution to the dispersion relation has been found, and is shown, by comparison to accurate numerical solutions of the individual modes, to be remarkably precise. This solution provides for the first time a systematic account of the totality of ion acoustic modes of the two-ion system. It has been found that ion acoustic modes consist of two types of modes: (a) at least one, and, at most, two weakly damped modes for which \omega(I)/omega(R)\ much-less-than 1, and (b) an infinity of critically damped modes for which omega(I)/omega(R) congruent-to -1. The critically damped modes are organized into two distinct categories: (a) modes for which \omega\/k > upsilon(F) (upsilon(F) is the thermal speed of the fast ion species); and (b) modes for which upsilon(S) < \omega\/k < upsilon(F) (upsilon(S) is the thermal speed of the slow ion species). The critically damped modes with \omega\/k > upsilon(F) are further organized into three distinct classes: (1) modes with phase speeds characterized by upsilon(F), (2) modes with phase speeds characterized by upsilon(F)upsilon(S)/square-root upsilon(F)2 - upsilon(S)2, and (3) modes with phase speeds characterized by upsilon(S). The critically damped modes with upsilon(S) < \omega\/k < upsilon(F) belong to a single class, and are characterized by upsilon(S). Generally, it is found that there are one, or, at most, two modes with relatively small damping, while most of the remaining modes are too strongly damped to be physically realized. It has also been found possible to maximize the ion acoustic damping in a two-ion plasma by a judicious choice of the relative ion concentrations. More specifically, an admixture of the lighter ion species will maximize the damping coefficient over a wide range of plasma conditions. This is important for certain gas-filled, inertial-fusion targets of current interest, where it is desirable to minimize the stimulated Brillouin backscatter process by maximizing the damping. RP VU, HX (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 6 TC 49 Z9 49 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD NOV PY 1994 VL 1 IS 11 BP 3542 EP 3556 DI 10.1063/1.870889 PG 15 WC Physics, Fluids & Plasmas SC Physics GA PP156 UT WOS:A1994PP15600004 ER PT J AU LIU, JM DEGROOT, JS MATTE, JP JOHNSTON, TW DRAKE, RP AF LIU, JM DEGROOT, JS MATTE, JP JOHNSTON, TW DRAKE, RP TI ELECTRON HEAT-TRANSPORT WITH NON-MAXWELLIAN DISTRIBUTIONS SO PHYSICS OF PLASMAS LA English DT Article ID STEEP TEMPERATURE-GRADIENTS; LASER-PRODUCED PLASMAS; INVERSE-BREMSSTRAHLUNG; ABSORPTION; FIELD; FLUX AB Measurements are presented of electron heat transport with non-Maxwellian (flattopped) distributions due to inverse bremsstrahlung absorption of intense microwaves in the University of California at Davis Aurora II device [Rogers et al., Phys. Fluids B 1, 741 (1989)]. The plasma is created by pulsed discharge in a cylindrical vacuum chamber with surface magnets arranged to create a density gradient. The ionization fraction (approximately 1%) is high enough that charged particle collisions are strongly dominant in the afterglow plasma. A short microwave pulse (approximately 2 mus) heats a region of the afterglow plasma (n(e)/n(cr) less-than-or-equal-to 0.5) creating a steep axial (L(T) approximately 1 - 10lambda(ei)) temperature gradient. Langmuir probes are used to measure the relaxation of the heat front after the microwave pulse. Time and space resolved measurements show that the isotropic component of the electron velocity distribution is flat topped (approximately exp[-(nu/nu(m))m], m >2) in agreement with Fokker-Planck calculations using the measured density profile. Classical heat transport theory is not valid both because the isotropic component of the electron velocity distribution is flattopped and the temperature gradients are very steep. C1 INRS ENERGIE & MAT,VARENNES J3X 1S2,PQ,CANADA. LAWRENCE LIVERMORE NATL LAB,PLASMA PHYS RES INST,LIVERMORE,CA 94551. RP LIU, JM (reprint author), UNIV CALIF DAVIS,DEPT APPL SCI,PLASMA RES GRP,DAVIS,CA 95616, USA. RI Drake, R Paul/I-9218-2012 OI Drake, R Paul/0000-0002-5450-9844 NR 30 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 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD NOV PY 1994 VL 1 IS 11 BP 3570 EP 3576 DI 10.1063/1.870892 PG 7 WC Physics, Fluids & Plasmas SC Physics GA PP156 UT WOS:A1994PP15600007 ER PT J AU HUA, TQ BROOKS, JN AF HUA, TQ BROOKS, JN TI ANALYSIS OF THE TOKAMAK SHEATH REGION WITH IN-SHEATH IONIZATION AND TRANSPORT OF SURFACE EMITTED PARTICLES SO PHYSICS OF PLASMAS LA English DT Article ID OBLIQUE MAGNETIC-FIELD; PLASMA AB A self-consistent numerical analysis has been performed of the oblique incidence magnetic field tokamak sheath, with in-sheath ionization and transport of surface desorbed and reflected hydrogen molecules and atoms, and sputtered and evaporated surface atoms. The analysis uses the newly developed BPHI Monte Carlo/cloud-in-cell kinetic code together with particle-surface interaction models. For typical plasma boundary conditions (T(e) = 100 eV, n(e) = 1 x 10(20) m-3), nearly all desorbed hydrogen molecules are ionized in the sheath; this lowers sheath potential by up to 30% and increases heat transmission by up to 150%. Backscattered hydrogen, and elastic collisions between primary ions and hydrogen molecules, in contrast, have a negligible effect on sheath parameters. The magnetic sheath region has a significant effect on sputtered tungsten atoms, resulting in high local redeposition, but is not itself changed by the sputtering. Ionization of thermally evaporated surface atoms (from overheating) can increase sheath heat transmission significantly, a process which may contribute to surface hot-spot formation. RP HUA, TQ (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 15 TC 23 Z9 23 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD NOV PY 1994 VL 1 IS 11 BP 3607 EP 3613 DI 10.1063/1.870896 PG 7 WC Physics, Fluids & Plasmas SC Physics GA PP156 UT WOS:A1994PP15600011 ER PT J AU WEBER, SV REMINGTON, BA HAAN, SW WILSON, BG NASH, JK AF WEBER, SV REMINGTON, BA HAAN, SW WILSON, BG NASH, JK TI MODELING OF NOVA INDIRECT DRIVE RAYLEIGH-TAYLOR EXPERIMENTS SO PHYSICS OF PLASMAS LA English DT Article ID LARGE GROWTH; INSTABILITY; PLASMAS; TARGETS; OPACITY; HOT AB The growth due to the Rayleigh-Taylor (RT) instability of single-wavelength surface perturbations on planar foils of brominated CH [CH(Br)] and fluorosilicone (FS) was measured. The foils were accelerated by x-ray ablation with temporally shaped drive pulses. A range of initial amplitudes (a0) and wavelengths (lambda) have been used. This paper focuses upon foils with small a0/lambda, which exhibit substantial growth in the linear regime, and are most sensitive to the calculated growth rate. The CH(Br) foils exhibit slower RT perturbation growth because opacity differences result in a larger ablation velocity and a longer density scale length than for FS. Tabulated opacities from detailed atomic models, OPAL [Astrophys. J. 397, 717 (1992)] and super transition array (STA) [Phys. Rev. A 40, 3183 (1989)] were employed. Unlike previous simulations which employed the average atom (XSN) opacity treatment, parameter adjustments to fit experimental data no longer appear necessary. Nonlocal thermodynamic equilibrium (NLTE) effects do not appear to be important. Other variables which may affect the modeling, such as changes of the equation of state and radiation drive spectrum, were also examined. The current calculational model, which incorporates physically justified choices for these calculational ingredients, agrees with the Nova single wavelength RT perturbation growth data. RP WEBER, SV (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 35 TC 45 Z9 48 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD NOV PY 1994 VL 1 IS 11 BP 3652 EP 3661 DI 10.1063/1.870900 PG 10 WC Physics, Fluids & Plasmas SC Physics GA PP156 UT WOS:A1994PP15600017 ER PT J AU CHANG, CH RAMSHAW, JD AF CHANG, CH RAMSHAW, JD TI NUMERICAL-SIMULATION OF NONEQUILIBRIUM EFFECTS IN AN ARGON PLASMA-JET SO PHYSICS OF PLASMAS LA English DT Article ID MULTICOMPONENT PLASMAS; AMBIPOLAR DIFFUSION; GAS-MIXTURES; FLOW AB Departures from thermal (translational), ionization, and excitation equilibrium in an axisymmetric argon plasma jet have been studied by two-dimensional numerical simulations. Electrons, ions, and excited and ground states of neutral atoms are represented as separate chemical species in the mixture. Transitions between excited states, as well as ionization/recombination reactions due to both collisional and radiative processes, are treated as separate chemical reactions. Resonance radiation transport is represented using Holstein escape factors to simulate both the optically thin and optically thick limits. The optically thin calculation showed significant underpopulation of excited species in the upstream part of the jet core, whereas in the optically thick calculation this region remains close to local thermodynamic equilibrium, consistent with previous experimental observations. Resonance radiation absorption is therefore an important effect. The optically thick calculation results also show overpopulations (relative to equilibrium) of excited species and electron densities in the fringes and downstream part of the jet core. In these regions, however, the electrons and ions are essentially in partial local thermodynamic equilibrium with the excited state at the electron temperature, even though the ionized and excited states are no longer in equilibrium with the ground state. Departures from partial local thermodynamic equilibrium are observed in the outer fringes and far downstream part of the jet. These results are interpreted in terms of the local relative time scales for the various physical and chemical processes occurring in the plasma. RP CHANG, CH (reprint author), IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 30 TC 43 Z9 44 U1 0 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD NOV PY 1994 VL 1 IS 11 BP 3698 EP 3708 DI 10.1063/1.870905 PG 11 WC Physics, Fluids & Plasmas SC Physics GA PP156 UT WOS:A1994PP15600022 ER PT J AU HOOVER, WG POSCH, H HOLIAN, BL AF HOOVER, WG POSCH, H HOLIAN, BL TI IS BOLTZMANN ENTROPY TIMES ARROWS ARCHER SO PHYSICS TODAY LA English DT Letter C1 UNIV VIENNA,A-1010 VIENNA,AUSTRIA. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RP HOOVER, WG (reprint author), UNIV CALIF DAVIS,DAVIS,CA 95616, USA. NR 4 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 0031-9228 J9 PHYS TODAY JI Phys. Today PD NOV PY 1994 VL 47 IS 11 BP 15 EP & PG 0 WC Physics, Multidisciplinary SC Physics GA PR132 UT WOS:A1994PR13200005 ER PT J AU QUAITE, FE TAKAYANAGI, S RUFFINI, J SUTHERLAND, JC SUTHERLAND, BM AF QUAITE, FE TAKAYANAGI, S RUFFINI, J SUTHERLAND, JC SUTHERLAND, BM TI DNA-DAMAGE LEVELS DETERMINE CYCLOBUTYL PYRIMIDINE DIMER REPAIR MECHANISMS IN ALFALFA SEEDLINGS SO PLANT CELL LA English DT Article ID NONRADIOACTIVE DNA; STRAND BREAKS; DARK-REPAIR; HUMAN-CELLS; QUANTITATION; PHOTOREACTIVATION; ELECTROPHORESIS; ENDONUCLEASE; PROTOPLASTS; RADIATION AB Ultraviolet radiation in sunlight damages DNA in plants, but little is understood about the types, lesion capacity, and coordination of repair pathways. We challenged intact alfalfa seedlings with UV doses that induced different initial levels of cyclobutyl pyrimidine dimers and measured repair by excision and photoreactivation. By using alkaline gel electrophoresis of nonradioactive DNAs treated with a cyclobutyl pyrimidine dimer-specific UV endonuclease, we quantitated ethidium-stained DNA by electronic imaging and calculated lesion frequencies from the number average molecular lengths. At low initial dimer frequencies (less than similar to 30 dimers per million bases), the seedlings used only photoreactivation to repair dimers; excision repair was not significant. At higher damage levels, both excision and photorepair contributed significantly. This strategy would allow plants with low damage levels to use error-free repair requiring only an external light energy source, whereas seedling subjected to higher damage frequencies could call on additional repair processes requiring cellular energy. Characterization of repair in plants thus requires an investigation of a range of conditions, including the level of initial damage. C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. NR 23 TC 61 Z9 64 U1 0 U2 5 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 1040-4651 J9 PLANT CELL JI Plant Cell PD NOV PY 1994 VL 6 IS 11 BP 1635 EP 1641 PG 7 WC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology SC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology GA PV366 UT WOS:A1994PV36600012 ER PT J AU STRAIN, J AF STRAIN, J TI FAST SPECTRALLY-ACCURATE SOLUTION OF VARIABLE-COEFFICIENT ELLIPTIC PROBLEMS SO PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY LA English DT Article DE ELLIPTIC SOLVERS; PRECONDITIONING; SPECTRAL METHODS ID NONSYMMETRIC LINEAR-SYSTEMS; EQUATIONS AB A simple, efficient, spectrally-accurate numerical method for solving variable-coefficient elliptic partial differential equations in periodic geometry is described. Numerical results show that the method is efficient and accurate even for difficult problems including convection-diffusion equations. Generalizations and applications to phase field models of crystal growth are discussed. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP STRAIN, J (reprint author), UNIV CALIF BERKELEY,DEPT MATH,BERKELEY,CA 94720, USA. NR 14 TC 9 Z9 9 U1 0 U2 0 PU AMER MATHEMATICAL SOC PI PROVIDENCE PA 201 CHARLES ST, PROVIDENCE, RI 02940-2213 SN 0002-9939 J9 P AM MATH SOC JI Proc. Amer. Math. Soc. PD NOV PY 1994 VL 122 IS 3 BP 843 EP 850 DI 10.2307/2160763 PG 8 WC Mathematics, Applied; Mathematics SC Mathematics GA PR993 UT WOS:A1994PR99300027 ER PT J AU FELSCH, JS HORVATH, MP GURSKY, S HOBAUGH, MR GOUDREAU, PN FEE, JA MORGAN, WT ADMIRAAL, SJ IKEDASAITO, M FUJIWARA, T FUKUMORI, Y YAMANAKA, T COPELAND, RA AF FELSCH, JS HORVATH, MP GURSKY, S HOBAUGH, MR GOUDREAU, PN FEE, JA MORGAN, WT ADMIRAAL, SJ IKEDASAITO, M FUJIWARA, T FUKUMORI, Y YAMANAKA, T COPELAND, RA TI PROBING PROTEIN COFACTOR INTERACTIONS IN THE TERMINAL OXIDASES BY 2ND DERIVATIVE SPECTROSCOPY - STUDY OF BACTERIAL ENZYMES WITH COFACTOR SUBSTITUTIONS AND HEME A MODEL COMPOUNDS SO PROTEIN SCIENCE LA English DT Article DE CYTOCHROME C OXIDASE; ELECTRON TRANSFER; HEME A; SPECTROSCOPY ID CYTOCHROME-C-OXIDASE; FACULTATIVE ALKALOPHILIC BACILLUS; FEATURES; SITE; CONFORMATION; PURIFICATION; DEPENDENCE; COMPLEXES; CUA AB Second derivative absorption spectra are reported for the aa(3)-cytochrome c oxidase from bovine cardiac mitochondria, the aa(3)-600 ubiquinol oxidase from Bacillus subtilis, the ba(3)-cytochrome c oxidase from Thermus thermophilis, and the aco-cytochrome c oxidase from Bacillus YN-2000. Together these enzymes provide a range of cofactor combinations that allow us to unequivocally identify the origin of the 450-nm absorption band of the terminal oxidases as the 6-coordinate low-spin heme, cytochrome a. The spectrum of the aco-cytochrome c oxidase further establishes that the split Soret band of cytochrome a, with features at 443 and 450 nm, is common to all forms of the enzyme containing ferrocytochrome a and does not depend on ligand occupancy at the other heme cofactor as previously suggested. To test the universality of this Soret band splitting for 6-coordinate low-spin heme A systems, we have reconstituted purified heme A with the apo forms of the heme binding proteins, hemopexin, histidine-proline-rich glycoprotein and the H64V/V68H double mutant of human myoglobin. All 3 proteins bound the heme A as a (bis)histidine complex, as judged by optical and resonance Raman spectroscopy. In the ferroheme A forms, none of these proteins displayed evidence of Soret band splitting. Heme A-(bis)imidazole in aqueous detergent solution likewise failed to display Soret band splitting. When the cyanide-inhibited mixed-valence form of the bovine enzyme was partially denatured by chemical or thermal means, the split Soret transition of cytochrome a collapsed into a single band at 443 nm. Taken together these data suggest that the observation of Soret splitting, including a feature at 450 nm, results from specific protein-cofactor interactions that are unique to the cytochrome a-binding pocket of the terminal oxidases. The conservation of this unique binding pocket among evolutionarily distant species may reflect some mechanistic significance for this structure. C1 DUPONT MERCK RES LABS,WILMINGTON,DE 19880. UNIV CHICAGO,DEPT BIOCHEM & MOLEC BIOL,CHICAGO,IL 60637. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV MISSOURI,SCH BIOL SCI,DIV BIOCHEM & MOLEC BIOL,KANSAS CITY,MO 64110. TOKYO INST TECHNOL,FAC BIOSCI & BIOTECHNOL,MIDORI KU,YOKOHAMA,KANAGAWA 227,JAPAN. RI Ikeda-Saito, Masao/A-5992-2008; Ikeda-Saito, Masao/K-2703-2015 FU NIGMS NIH HHS [GM 44919, GM 35342, GM 51558] NR 28 TC 7 Z9 8 U1 1 U2 10 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD NOV PY 1994 VL 3 IS 11 BP 2097 EP 2103 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA PZ824 UT WOS:A1994PZ82400023 PM 7703856 ER PT J AU BIELSKI, BHJ SHARMA, VK CZAPSKI, G AF BIELSKI, BHJ SHARMA, VK CZAPSKI, G TI REACTIVITY OF FERRATE(V) WITH CARBOXYLIC-ACIDS - A PRE-MIX PULSE-RADIOLYSIS STUDY SO RADIATION PHYSICS AND CHEMISTRY LA English DT Article ID POTASSIUM FERRATE; KINETICS; OXIDATION; IRON; INTERMEDIATE AB Rates of reduction of ferrate(VI) to ferrate(V) by a number of organic acid and ester radicals (monocarboxylic acids, dicarboxylic acids, amino acids, malonic acid esters), generated by the pulse radiolysis technique, vary from 10(7)-10(9) dm3 mol-1 s-1. The rate at which these radicals reduce ferrate(VI) depends upon the nature of the substituents at the alpha-carbon atom and decrease in the order alpha-C-NH2 > alpha-C-OH > alpha-C-H. A similar dependence upon the alpha-C-group(s) has been observed for the oxidation of the parent organic acid by ferrate(V), for which the rate constants vary from 10(1)-10(6) dm3 mol-1 s-1. An oxidation mechanism is being proposed in which ferrate(V) oxidizes the carboxylic acid by a two-electron process. The rate of the oxidation process is dependent on the protonation of ferrate(V). For example, in the oxidation of gluconic acid with H2FeVO4-/HFeVO42-; k10(H2FeVO4- + gluconate) = 1.1 x 10(6) dm3 mol-1 s-1 and k11(HFeVO42- + gluconate) = 2.0 x 10(5) dm3 mol-1 s-1. The oxidation mechanisms for malate and aspartate by OH radicals and ferrate(V) are compared. RP BIELSKI, BHJ (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. OI Sharma, Virender/0000-0002-5980-8675 NR 19 TC 44 Z9 47 U1 2 U2 18 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0146-5724 J9 RADIAT PHYS CHEM JI Radiat. Phys. Chem. PD NOV PY 1994 VL 44 IS 5 BP 479 EP 484 DI 10.1016/0969-806X(94)90044-2 PG 6 WC Chemistry, Physical; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical SC Chemistry; Nuclear Science & Technology; Physics GA NR348 UT WOS:A1994NR34800006 ER PT J AU WILSON, JW SHAVERS, MR BADAVI, FF MILLER, J SHINN, JL COSTEN, RC AF WILSON, JW SHAVERS, MR BADAVI, FF MILLER, J SHINN, JL COSTEN, RC TI NONPERTURBATIVE METHODS IN HZE PROPAGATION SO RADIATION RESEARCH LA English DT Article ID 670A MEV NE-20; TRANSPORT-THEORY; FRAGMENTATION; DEPTH; WATER AB An analytical solution to the perturbative multiple collision series of a fragmenting HZE ion beam has limited usefulness since the first collision term has several hundred contributions, the second collision term has tens of thousands of contributions, and each successive collision term progresses to unwieldy computational proportions. Our previous work has revealed the multiple collision terms in the straight-ahead approximation to be simple products of a spatially dependent factor times a linear energy-dependent factor of limited domain and unit normalization. The properties of these forms allow the development of the nonperturbative summation of the series to all orders assuming energy-independent nuclear cross sections as matrix products of a scaled Green's function described herein. This nonperturbative Green's function with multiple scattering correction factors compares well with experiments using 670 MeV/u neon-20 ion beams in thick water targets. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. CHRISTOPHER NEWPORT UNIV,NEWPORT NEWS,VA 23601. RP WILSON, JW (reprint author), NASA,LANGLEY RES CTR,HAMPTON,VA 23681, USA. NR 20 TC 13 Z9 13 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 NOV PY 1994 VL 140 IS 2 BP 241 EP 248 DI 10.2307/3578908 PG 8 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA PN944 UT WOS:A1994PN94400012 PM 7938473 ER PT J AU RYDBERG, B LOBRICH, M COOPER, PK AF RYDBERG, B LOBRICH, M COOPER, PK TI INTERACTIVE DNA-DAMAGE - REPLY SO RADIATION RESEARCH LA English DT Letter ID REPAIR RP RYDBERG, B (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BLDG 934,BERKELEY,CA 94720, USA. NR 4 TC 0 Z9 0 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 NOV PY 1994 VL 140 IS 2 BP 295 EP 296 DI 10.2307/3578916 PG 2 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA PN944 UT WOS:A1994PN94400019 ER PT J AU KRIGER, AA MOYER, BA ALEXANDRATOS, SD AF KRIGER, AA MOYER, BA ALEXANDRATOS, SD TI SYNERGISTIC COMPLEXATION OF METAL-IONS WITH BIFUNCTIONAL INTERPENETRATING POLYMER NETWORKS SO REACTIVE POLYMERS LA English DT Article DE POLYMER-SUPPORTED REAGENT; METAL ION COMPLEXATION; INTERPENETRATING POLYMER NETWORK; SYNERGISM ID SOLVENT-EXTRACTION; COMPLEXING AGENTS; RECOVERY; ACID AB A vinylpyridine/acrylic acid bifunctional interpenetrating polymer network (IPN) has been synthesized and evaluated for application in metal ion separations. Monofunctional vinylpyridine and acrylic acid IPNs were also synthesized and differences between the distribution coefficients of the three systems were used as an indication of whether an enhanced (i.e., synergistic) complexation of metal ions was occurring in the bifunctional polymer. Important effects atrtributable to the combined action of the two functionalities in the same polymer are observed. Complexation of Eu(III), a hard Lewis acidm by the bifunctional polymer is inhibited by hydrogen bonding between the two ligands. Borderline Lewis acids are complexed with high efficiency and evidence for a synergistic effect is presented. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. RI Solominow, Sonia/A-4021-2008; Moyer, Bruce/L-2744-2016 OI Moyer, Bruce/0000-0001-7484-6277 NR 20 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0923-1137 J9 REACT POLYM JI React. Polym. PD NOV PY 1994 VL 24 IS 1 BP 35 EP 39 DI 10.1016/0923-1137(94)90134-1 PG 5 WC Chemistry, Applied; Engineering, Chemical; Polymer Science SC Chemistry; Engineering; Polymer Science GA PY597 UT WOS:A1994PY59700006 ER PT J AU ADAMSON, TP MYERS, BK SOLOMON, IC AF ADAMSON, TP MYERS, BK SOLOMON, IC TI CHICKEN INTRAPULMONARY AND CARDIAC NERVE AFFERENTS INTERACT IN VENTILATORY CONTROL SO RESPIRATION PHYSIOLOGY LA English DT Article DE BIRDS, CHICKEN; CONTROL OF BREATHING, PERIPHERAL AFFERENTS, CENTRAL INTERACTION; NERVE, MIDDLE CARDIAC; RECEPTORS, INTRAPULMONARY CHEMO ID CHEMORECEPTOR CONTROL AB Intrapulmonary chemoreceptors (IPC) and extrapulmonary afferents (EPA) have been shown to interact in ventilatory control in the chicken. It is not clear, however, if all or only some of the EPA are involved in this interaction with IPC. We therefore designed this study to determine if afferents carried in the middle cardiac nerve (MCN) interact centrally with IPC. We anesthetized six cockerels with sodium pentobarbital(ca. 30 mg/kg), cannulated the cutaneous ulnar vein and carotid artery, opened the thorax, and unidirectionally ventilated each lung separately. The right, denervated lung was used to fix Pa-CO2 at the following levels: 89.5 +/- 1.1, 41.9 +/- 0.6, 35.9 +/- 0.8, and 23.6 +/- 0.5 Torr. At each Pa-CO2, we measured ventilatory and blood pressure responses while the left, non-perfused lung was ventilated with gases ranging from 70.2 to 15.7 Torr P-CO2. We then cut the MCN and repeated the protocol. We found that MCN section increased the amplitude of sternal deflections (SD/SDmax) at all levels of intrapulmonary P-CO2 and reduced the respiratory period (T/T-max) at all but the highest level of intrapulmonary P-CO2. Mean arterial pressure increased following MCN section, and this increase was independent of intrapulmonary P-CO2. Multiple regression analyses of SD/SDmax revealed that MCN section reduced both arterial CO2 sensitivity and the interaction between EPA and IPC. These findings suggest that afferents carried in the MCN interact with IPC to reduce ventilatory amplitude during hypocapnia. C1 LAWRENCE LIVERMORE NATL LAB,DEPT AVIAN SCI,DAVIS,CA 95616. RP ADAMSON, TP (reprint author), LAWRENCE LIVERMORE NATL LAB,NEUROBIOL PHYSIOL & BEHAV SECT,DAVIS,CA 95616, USA. NR 10 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0034-5687 J9 RESP PHYSIOL JI Respir. Physiol. PD NOV-DEC PY 1994 VL 98 IS 3 BP 283 EP 293 DI 10.1016/0034-5687(94)90077-9 PG 11 WC Physiology; Respiratory System SC Physiology; Respiratory System GA PU817 UT WOS:A1994PU81700004 PM 7899729 ER PT J AU KUSHNIR, V AF KUSHNIR, V TI TEMPERATURE DISTRIBUTION, DEFORMATIONS, AND X-RAY-DIFFRACTION IN THE INCLINED HIGH HEAT LOAD MONOCHROMATOR - ANALYTICAL SOLUTIONS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID CRYSTAL MONOCHROMATOR; POWER-DENSITY; PERFORMANCE; RADIATION; BEAM RP KUSHNIR, V (reprint author), ARGONNE NATL LAB,ADV PHOTON SOURCE,9700 S CASS AVE,ARGONNE,IL 60439, 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 NOV PY 1994 VL 65 IS 11 BP 3403 EP 3407 DI 10.1063/1.1145199 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA PT164 UT WOS:A1994PT16400015 ER PT J AU NAGAYAMA, Y AF NAGAYAMA, Y TI TOMOGRAPHY ON TOKAMAK FUSION TEST REACTOR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID X-RAY TOMOGRAPHY; T-II TOKAMAK; SAWTOOTH OSCILLATIONS; TFTR TOKAMAK; M=1 MODE; JET RP NAGAYAMA, Y (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 26 TC 8 Z9 8 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 NOV PY 1994 VL 65 IS 11 BP 3415 EP 3422 DI 10.1063/1.1144515 PG 8 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA PT164 UT WOS:A1994PT16400017 ER PT J AU SCHNEIDER, D CHURCH, DA WEINBERG, G STEIGER, J BECK, B MCDONALD, J MAGEE, E KNAPP, D AF SCHNEIDER, D CHURCH, DA WEINBERG, G STEIGER, J BECK, B MCDONALD, J MAGEE, E KNAPP, D TI CONFINEMENT IN A CRYOGENIC PENNING TRAP OF HIGHEST CHARGE-STATE IONS FROM EBIT SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID ELECTRON; RADIATION RP SCHNEIDER, D (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 29 TC 35 Z9 35 U1 3 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 NOV PY 1994 VL 65 IS 11 BP 3472 EP 3478 DI 10.1063/1.1144525 PG 7 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA PT164 UT WOS:A1994PT16400027 ER PT J AU LORENZANA, HE BENNAHMIAS, M RADOUSKY, H KRUGER, MB AF LORENZANA, HE BENNAHMIAS, M RADOUSKY, H KRUGER, MB TI PRODUCING DIAMOND-ANVIL CELL GASKETS FOR ULTRAHIGH-PRESSURE APPLICATIONS USING AN INEXPENSIVE ELECTRIC-DISCHARGE MACHINE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID THEORETICAL-MODELS; EROSION MODEL; FLUORESCENCE; HYDROGEN C1 UNIV MISSOURI,DEPT PHYS,KANSAS CITY,MO 64110. RP LORENZANA, HE (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 23 TC 10 Z9 11 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD NOV PY 1994 VL 65 IS 11 BP 3540 EP 3543 DI 10.1063/1.1144535 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA PT164 UT WOS:A1994PT16400038 ER PT J AU PIN, FG WATANABE, Y AF PIN, FG WATANABE, Y TI NAVIGATION OF MOBILE ROBOTS USING A FUZZY BEHAVIORIST APPROACH AND CUSTOM-DESIGNED FUZZY INTERFERENCING BOARDS SO ROBOTICA LA English DT Article; Proceedings Paper CT 4th International Symposium on Robotics and Manufacturing (ISRAM) CY NOV, 1992 CL SANTA FE, NM DE MOBILE ROBOTS; NAVIGATION; FUZZY BEHAVIORIST; FUZZY BOARDS AB Two types of computer boards incorporating recently developed VLSI fuzzy inferencing chips have been developed to support the addition of qualitative reasoning capabilities to the real-time control of robotic systems. The design and operation of these boards are first reviewed and their use, in conjunction with our proposed Fuzzy Behaviorist approach, is discussed. This approach uses superposition of elemental sensor-based behaviors expressed in the Fuzzy Sets theoretic framework, to emulate ''human-like'' reasoning in robotic systems. In this paper, we discuss the implementation formalism which we developed to embody into fuzzy rule bases the decision-making modules of approximate sensor-equipped robots, and present an application to the development of qualitative reasoning schemes for autonomous robot navigation in a priori unknown environments. Several experiments involving mobile robots navigating in indoor and/or outdoor environments on the basis of very sparse and inaccurate sensor data are presented to illustrate the rule base development and augmentation process. The experiments progress from a small omnidirectional platform navigating autonomously in laboratory-type environments, to an actual car operating in parking lots under driver's aid control mode. These experiments illustrate that with the proposed Fuzzy Behaviorist approach and its associated implementation formalism, the inferencing rule base is easily developed and tested, while the progressive addition of behaviors allows the system to resolve situations of increasing complexity. Results from these experiments also indicate the efficiency of the proposed approach and of the resulting inferencing schemes, which can consist of as little as half a dozen behaviors, each consisting of about three qualitative rules, for typical navigation tasks. RP PIN, FG (reprint author), OAK RIDGE NATL LAB,AUTONOMOUS ROBOT SYST GRP,OAK RIDGE,TN 37831, USA. NR 0 TC 25 Z9 25 U1 1 U2 2 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0263-5747 J9 ROBOTICA JI Robotica PD NOV-DEC PY 1994 VL 12 BP 491 EP 503 PN 6 PG 13 WC Robotics SC Robotics GA PT555 UT WOS:A1994PT55500003 ER PT J AU HIKOSAKA, T IMAI, T NIEH, TG WADSWORTH, J AF HIKOSAKA, T IMAI, T NIEH, TG WADSWORTH, J TI HIGH-STRAIN RATE SUPERPLASTICITY OF A SIC PARTICULATE-REINFORCED ALUMINUM-ALLOY COMPOSITE BY A VORTEX METHOD SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article C1 NATL IND RES INST NAGOYA,KITA KU,NAGOYA 462,JAPAN. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. RP HIKOSAKA, T (reprint author), AICHI PREFECTURAL GOVT,IND RES INST,KARIYA,AICHI 448,JAPAN. RI Nieh, Tai-Gang/G-5912-2011 OI Nieh, Tai-Gang/0000-0002-2814-3746 NR 12 TC 26 Z9 26 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD NOV 1 PY 1994 VL 31 IS 9 BP 1181 EP 1186 DI 10.1016/0956-716X(94)90573-8 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PC726 UT WOS:A1994PC72600012 ER PT J AU BUTLER, MA AF BUTLER, MA TI MICROMIRROR OPTICAL-FIBER HYDROGEN SENSOR SO SENSORS AND ACTUATORS B-CHEMICAL LA English DT Article DE HYDROGEN SENSOR; MICROMIRROR; OPTICAL FIBERS ID FILMS; PALLADIUM AB In a recent letter (M.A. Butler, J. Electrochem. Soc., 138 (1991) L46) a new hydrogen sensor was reported that operates by measuring changes in the reflectivity of thin palladium films deposited on the end of an optical fiber when exposed to hydrogen gas. In this paper we explore in more detail the mechanisms of operation of this sensor. Two effects are observed: a reversible micro-blistering of the films on exposure to hydrogen and changes in optical constants with hydriding. Use of a thin nickel layer under the palladium to improve adhesion results in large changes in optical response. These changes are attributed to clamping effects on the film. RP BUTLER, MA (reprint author), SANDIA NATL LABS, DEPT MICROSENSOR, ALBUQUERQUE, NM 87185 USA. NR 21 TC 122 Z9 130 U1 2 U2 18 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-4005 J9 SENSOR ACTUAT B-CHEM JI Sens. Actuator B-Chem. PD NOV PY 1994 VL 22 IS 2 BP 155 EP 163 DI 10.1016/0925-4005(94)87015-2 PG 9 WC Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation SC Chemistry; Electrochemistry; Instruments & Instrumentation GA PX999 UT WOS:A1994PX99900012 ER PT J AU BROWN, PN HINDMARSH, AC PETZOLD, LR AF BROWN, PN HINDMARSH, AC PETZOLD, LR TI USING KRYLOV METHODS IN THE SOLUTION OF LARGE-SCALE DIFFERENTIAL-ALGEBRAIC SYSTEMS SO SIAM JOURNAL ON SCIENTIFIC COMPUTING LA English DT Article DE DIFFERENTIAL-ALGEBRAIC SYSTEMS; KRYLOV METHODS ID SUBSPACE METHODS; LINEAR-SYSTEMS; EQUATIONS; CODES; ODES; ALGORITHMS; GMRES AB In this paper, a new algorithm for the solution of large-scale systems of differential-algebraic equations is described. It is based on the integration methods in the solver DASSL, but instead of a direct method for the associated linear systems which arise at each time step, we apply the preconditioned GMRES iteration in combination with an Inexact Newton Method. The algorithm, along with those in DASSL, is implemented in a new solver called DASPK. We outline the algorithms and strategies used, and discuss the use of the solver. We develop and analyze some preconditioners for a certain class of DAE stems, and finally demonstrate the application of DASPK on two example problems. C1 UNIV MINNESOTA,DEPT COMP SCI,MINNEAPOLIS,MN 55455. RP BROWN, PN (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV COMP & MATH RES,L-316,LIVERMORE,CA 94550, USA. NR 22 TC 236 Z9 237 U1 1 U2 13 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 1064-8275 J9 SIAM J SCI COMPUT JI SIAM J. Sci. Comput. PD NOV PY 1994 VL 15 IS 6 BP 1467 EP 1488 DI 10.1137/0915088 PG 22 WC Mathematics, Applied SC Mathematics GA PP626 UT WOS:A1994PP62600012 ER PT J AU FENDORF, SE SPARKS, DL LAMBLE, GM KELLEY, MJ AF FENDORF, SE SPARKS, DL LAMBLE, GM KELLEY, MJ TI APPLICATIONS OF X-RAY-ABSORPTION FINE-STRUCTURE SPECTROSCOPY TO SOILS SO SOIL SCIENCE SOCIETY OF AMERICA JOURNAL LA English DT Review ID NEAR-EDGE STRUCTURE; OXIDE WATER INTERFACE; SURFACE COMPLEXES; MODEL COMPOUNDS; ALPHA-FEOOH; EXAFS; SULFUR; SORPTION; CATALYSTS; OXIDATION AB Determining the local chemical environment of a species is often a necessity for evaluating its reactivity in the environment. However, obtaining direct molecular-level information is often problematic and may only be possible with severely invasive techniques. We discuss the physical and chemical aspects of x-ray absorption fine structure spectroscopy (XAFS) and its application in soils. This technique can determine the local chemical and structural surroundings of a particular elemental species in soil and water or other natural systems, without the need to subject the sample to a foreign atmosphere. Electronic information and a fingerprint of the x-ray absorbing element's local environment is provided with XAFS and can be used to determine the speciation of an element in media like soils. Precise structural information (bond distances within 0.02 Angstrom) can also be ascertained with this method, although this precision is often difficult to obtain in heterogeneous materials. Nevertheless, XAFS is a method that can contribute significantly to our knowledge of soils and soil reactions. C1 UNIV DELAWARE, DEPT PLANT & SOIL SCI, NEWARK, DE 19717 USA. UNIV IDAHO, DIV SOIL SCI, MOSCOW, ID 83844 USA. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. DUPONT CO INC, WILMINGTON, DE 19880 USA. NR 44 TC 46 Z9 47 U1 0 U2 14 PU SOIL SCI SOC AMER PI MADISON PA 677 SOUTH SEGOE ROAD, MADISON, WI 53711 USA SN 0361-5995 J9 SOIL SCI SOC AM J JI Soil Sci. Soc. Am. J. PD NOV-DEC PY 1994 VL 58 IS 6 BP 1583 EP 1595 PG 13 WC Soil Science SC Agriculture GA PT174 UT WOS:A1994PT17400001 ER PT J AU AINSWORTH, CC PILON, JL GASSMAN, PL VANDERSLUYS, WG AF AINSWORTH, CC PILON, JL GASSMAN, PL VANDERSLUYS, WG TI COBALT, CADMIUM, AND LEAD SORPTION TO HYDROUS IRON-OXIDE - RESIDENCE TIME EFFECT SO SOIL SCIENCE SOCIETY OF AMERICA JOURNAL LA English DT Article ID NITRATE SOLUTIONS; ADSORPTION; OXYHYDROXIDE; METALS; PRECIPITATION; FERRIHYDRITE; MANGANESE; ALUMINUM; MODEL AB The adsorption-desorption of the divalent metal cations (Me(2+)) Co2+, Cd2+, and Pb2+ to hydrous ferric oxide (HFO) was investigated as a function of oxide aging and Me(2+)-oxide residence time. The HFO was produced and stored for up to 86 wk. Periodically, Me(2+) sorption was determined across the pH range of 2.5 to 12. In addition, the Me(2+) ions were contacted with freshly produced HFO and stored at a pH that dictated that 80 to 100% of the Me(2+) would be in the sorbed state; desorbability of the Me(2+) was determined as a function of Me(2+)-oxide residence time. The change in the crystallinity of the HFO as a function of time was also monitored. The HFO aged without the Me(2+) ions displayed no hysteresis between the adsorption-desorption curves and no substantial shifts in fractional Me(2+) adsorption were observed with pH throughout 21 wk of aging. The HFO aged with the Me(2+) ions displayed increasing desorption hysteresis with time for Co2+ and Cd2+, but not Pb2+. The magnitude of hysteresis followed the order Co > Cd > Pb, which is the inverse of the ionic radii of the metal sorbates. While oxalate-extractable Fe decreased with time during a 20-wk period, powder x-ray diffraction was unchanged during the same period. The data presented here suggest that Co and Cd are being incorporated into the metal oxide structure via recrystallization, but ph remains associated with the surface and excluded from incorporation. C1 UNIV MONTANA, DEPT CHEM, MISSOULA, MT 59812 USA. RP AINSWORTH, CC (reprint author), PACIFIC NW LAB, BOX 999,MSIN K3-61, RICHLAND, WA 99352 USA. NR 38 TC 179 Z9 185 U1 5 U2 31 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 NOV-DEC PY 1994 VL 58 IS 6 BP 1615 EP 1623 PG 9 WC Soil Science SC Agriculture GA PT174 UT WOS:A1994PT17400005 ER PT J AU WONG, J GEORGE, GN PICKERING, IJ REK, ZU ROWEN, M TANAKA, T VIA, GH DEVRIES, B VAUGHAN, DEW BROWN, GE AF WONG, J GEORGE, GN PICKERING, IJ REK, ZU ROWEN, M TANAKA, T VIA, GH DEVRIES, B VAUGHAN, DEW BROWN, GE TI NEW OPPORTUNITIES IN XAFS INVESTIGATION IN THE 1-2-KEV REGION SO SOLID STATE COMMUNICATIONS LA English DT Article DE A YB66; C EXAFS; C XANES; E SYNCHROTRON RADIATION; E X-RAY SPECTROSCOPY ID SOFT-X-RAY; DOUBLE CRYSTAL MONOCHROMATOR; SILICA-RICH GLASSES; K-EDGE; COORDINATION ENVIRONMENT; NA2O-AL2O3-SIO2 SYSTEM; SYNCHROTRON RADIATION; ABSORPTION; ALUMINUM; RANGE AB We report herein the first of a series of K-edge XAFS (x-ray absorption fine structure) spectra of some selected Mg, Al and Si model compounds in the 1-2 keV region using a newly developed YB66 monochromator. These elements have K-edges in the 1-2 keV region (Mg: 1303 eV; Al: 1559 and Si: 1839 eV), and have hitertofore often been regarded as relatively spectroscopic silent, both because of the difficulties associated with obtaining XAFS data, due to a lack of synchroton radiation-stable monochromator, and because there are few other readily available spectroscopic probes of local structure for these elements. The present data clearly show that the K-edge spectra are sensitive probes of the chemical nature of these elements. We forsee that XAFS will provide a valuable spectroscopic probe for these and other elements in a variety of technological, biological and environmentally relevant materials. C1 STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. NATL INST RES INORGAN MAT,IBARAKI 305,JAPAN. EXXON RES & ENGN CO,ANNANDALE,NJ 08801. STANFORD UNIV,DEPT GEOL ENVIRONM SCI,STANFORD,CA 94305. RP WONG, J (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94551, USA. RI George, Graham/E-3290-2013; Pickering, Ingrid/A-4547-2013; OI Pickering, Ingrid/0000-0002-0936-2994 NR 29 TC 73 Z9 74 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD NOV PY 1994 VL 92 IS 7 BP 559 EP 562 DI 10.1016/0038-1098(94)00607-5 PG 4 WC Physics, Condensed Matter SC Physics GA PN941 UT WOS:A1994PN94100003 ER PT J AU CAMPBELL, EM AF CAMPBELL, EM TI IN DEFENSE OF SOFT-X-RAY PROJECTION LITHOGRAPHY SO SOLID STATE TECHNOLOGY LA English DT Letter RP CAMPBELL, EM (reprint author), LAWRENCE LIVERMORE NATL LAB,LASER PROGRAMS,LIVERMORE,CA 94550, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU PENNWELL PUBL CO SOLID STATE TECHNOLOGY OFFICE PI NASHUA PA TEN TARA BLVD 5TH FLOOR, NASHUA, NH 03062-2801 SN 0038-111X J9 SOLID STATE TECHNOL JI Solid State Technol. PD NOV PY 1994 VL 37 IS 11 BP 14 EP 14 PG 1 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA PR088 UT WOS:A1994PR08800002 ER PT J AU WALTER, CA LU, JW BHAKTA, M ZHOU, ZQ THOMPSON, LH MCCARREY, JR AF WALTER, CA LU, JW BHAKTA, M ZHOU, ZQ THOMPSON, LH MCCARREY, JR TI TESTIS AND SOMATIC XRCC-1 DNA-REPAIR GENE-EXPRESSION SO SOMATIC CELL AND MOLECULAR GENETICS LA English DT Article ID SISTER-CHROMATID EXCHANGE; STRAND-BREAK REPAIR; MOLECULAR-CLONING; CELL LINES; CHROMOSOME-ABNORMALITIES; XERODERMA-PIGMENTOSUM; CDNA CLONING; MUTANT EM9; MOUSE; MICE AB The human XRCC1 gene has been shown to be involved in DNA strand-break repair using the Chinese hamster ovary cell mutant EM9. The purpose of this study was to characterize the expression of Xrcc-1 to determine if there is tissue-specific expression and to provide a baseline of information for future studies that may involve altering Xrcc-1 expression in mice. Normal young adult male testis and enriched populations of pachytene spermatocytes and round spermatids displayed significantly higher levels of Xrcc-1 expression than other mouse tissues, although Xrcc-1 transcripts were found in low abundance in all tested tissues. Cultured mouse cell lines displayed levels of expression similar to male germ cells, which is a striking contrast to the levels of expression obtained in somatic tissues from the mouse. The relatively high levels of expression identified in male germ cells indicate Xrcc-1 may have an important role in male germ cell physiology. C1 LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,LIVERMORE,CA 94551. SW FDN BIOMED RES,DEPT GENET,SAN ANTONIO,TX 78228. RP WALTER, CA (reprint author), UNIV TEXAS,HLTH SCI CTR,DEPT CELLULAR & STRUCT BIOL,7703 FLOYD CURL DR,SAN ANTONIO,TX 78284, USA. FU NICHD NIH HHS [HD-23216] NR 45 TC 37 Z9 37 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0740-7750 J9 SOMAT CELL MOLEC GEN JI Somat.Cell Mol.Genet. PD NOV PY 1994 VL 20 IS 6 BP 451 EP 461 DI 10.1007/BF02255837 PG 11 WC Biochemistry & Molecular Biology; Cell Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Cell Biology; Genetics & Heredity GA QN750 UT WOS:A1994QN75000001 PM 7892645 ER PT J AU LI, YG DEPRISTO, AE AF LI, YG DEPRISTO, AE TI POTENTIAL-ENERGY BARRIERS FOR INTERLAYER MASS-TRANSPORT IN HOMOEPITAXIAL GROWTH ON FCC(111) SURFACES - PT AND AG SO SURFACE SCIENCE LA English DT Article ID CORRECTED EFFECTIVE-MEDIUM; BY-LAYER GROWTH; BODY FORMULATION; REACTION-PATH; DIFFUSION; CLUSTERS; AG(111); SYSTEMS AB The efficiency of interlayer mass transport determines the growth mode and film quality in molecular beam epitaxy. In this paper we report potential energy barriers (FEB) to interlayer diffusion for Pt and Ag homoepitaxial growth on fcc(lll) surfaces, as calculated using the corrected effective medium theory. Various island structures were considered. The island sizes ranged from 3- to about 60-atom islands and to various steps (''infinite'' large islands). We found that jumping directly over the island edge has a much higher FEB than does the so-called displacement-exchange mechanism. Exchange at edges with kink sites also had a higher or comparable FEB to those at the straight (perfect) edges, contrary to previous speculations [M. Henzler, T. Schmidt and E.Z. Luo, in: The Structure of Surfaces IV (World Scientific, Signapore, 1994)]. The FEB depended strongly on the local atomic arrangement but was insensitive to the global island size and shape as long as the island edges were at least five atoms long. For the displacement-exchange process, the FEB did not decrease monotonically with decreasing island size over the entire island size range. For very small islands of less than ten atoms the FEB increased abruptly by an order of magnitude. This qualitative behavior was exhibited by both Pt and Ag systems but the two differed quantitatively for island sizes above ten atoms. We discuss the relevance of these results to the experimental observations, i.e., the reentrant growth in Pt [R. Kunkel, B. Poelsema, L.K, Verheij and G. Comsa, Phys. Rev, Lett. 65 (1990) 733], layer-by-layer growth in Ag induced by surfactant [H.A. van der Vegt, H.M. van Pinxteren, M. Lohmerier and E. Vlieg, Phys. Rev. Lett. 68 (1992) 3335] or by high-density of islands [G. Rosenfeld, R. Servaty, C. Teichert, B. Poelsema and G. Comsa, Phys. Rev. Lett. 71 (1993) 895], as well as the different growth behaviors found in the two systems. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 28 TC 51 Z9 51 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD NOV 1 PY 1994 VL 319 IS 1-2 BP 141 EP 148 DI 10.1016/0039-6028(94)90576-2 PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA PN762 UT WOS:A1994PN76200018 ER PT J AU TRUCO, MJ QUIROS, CF AF TRUCO, MJ QUIROS, CF TI STRUCTURE AND ORGANIZATION OF THE B-GENOME BASED ON A LINKAGE MAP IN BRASSICA-NIGRA SO THEORETICAL AND APPLIED GENETICS LA English DT Article DE LINKAGE MAP; BRASSICA NIGRA; RFLP; RAPD ID RESTRICTION-FRAGMENT-LENGTH; CHROMOSOME ADDITION LINES; EXPRESSED DNA-SEQUENCES; RAPA SYN CAMPESTRIS; LACTUCA-SATIVA L; GENETIC-MAP; POLYMORPHISM LOCI; RFLP MARKERS; MORPHOLOGICAL MARKERS; CDNA CLONE AB We constructed a genetic map on Brassica nigra based on a segregating population of 83 F-2 individuals. Three different types of molecular markers were used to build the map including isozymes, restriction fragment length polymorphisms (RFLP), and random amplified polymorphic DNA (RAPD). The final map contained 124 markers distributed in 11 linkage groups. The map covered a total distance of 677 cM with the markers distributed within a mean distance of 5.5 cM. Of the sequences found in the B. nigra map, 40% were duplicated and organized into three different types of arrangements. They were either scattered throughout the genome, organized in tandem, or organized in blocks of duplicated loci conserved in more than 1 linkage group. C1 LAWRENCE LIVERMORE NATL LAB,DEPT VEGETABLE CROPS,DAVIS,CA 95616. UTAH STATE UNIV,DEPT BIOL,LOGAN,UT 84322. NR 61 TC 35 Z9 43 U1 0 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0040-5752 J9 THEOR APPL GENET JI Theor. Appl. Genet. PD NOV PY 1994 VL 89 IS 5 BP 590 EP 598 PG 9 WC Agronomy; Plant Sciences; Genetics & Heredity; Horticulture SC Agriculture; Plant Sciences; Genetics & Heredity GA PV520 UT WOS:A1994PV52000010 PM 24177935 ER PT J AU KING, WE CAMPBELL, GH AF KING, WE CAMPBELL, GH TI QUANTITATIVE HREM USING NONLINEAR LEAST-SQUARES METHODS SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT International Symposium on High-Voltage and High-Resolution Electron Microscopy - Achievements and Future Developments CY FEB 21-24, 1994 CL MAX PLANCK INST METALLFORSCH, STUTTGART, GERMANY HO MAX PLANCK INST METALLFORSCH ID RESOLUTION AB Non-linear least-squares methods have been coupled with high-resolution image simulation to determine the critical electron microscopic imaging parameters, such as thickness and defocus, from an experimental image. The method has been extended to include the optimization of atomic column positions to determine atomic structure. As an example, the method has been applied to the refinement of the atomic structure of a Sigma 5(310)/[001] grain boundary in Nb. RP KING, WE (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550, USA. RI Campbell, Geoffrey/F-7681-2010 NR 9 TC 45 Z9 45 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD NOV PY 1994 VL 56 IS 1-3 BP 46 EP 53 DI 10.1016/0304-3991(94)90145-7 PG 8 WC Microscopy SC Microscopy GA PV844 UT WOS:A1994PV84400006 ER PT J AU BUCKETT, MI MERKLE, KL AF BUCKETT, MI MERKLE, KL TI DETERMINATION OF GRAIN-BOUNDARY VOLUME EXPANSION BY HREM SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT International Symposium on High-Voltage and High-Resolution Electron Microscopy - Achievements and Future Developments CY FEB 21-24, 1994 CL MAX PLANCK INST METALLFORSCH, STUTTGART, GERMANY HO MAX PLANCK INST METALLFORSCH ID STRUCTURE-ENERGY CORRELATION; RESOLUTION ELECTRON-MICROSCOPY; RIGID-BODY DISPLACEMENTS; FCC METALS; INTERFACIAL FILMS; TILT; PLANES AB High resolution electron microscopy (HREM) has provided invaluable insight into the structure of grain boundaries at the atomistic level. Quantitative HREM methods are now in development which, combined with atomistic simulations, can provide further insight into grain boundary structure-energy correlations. For example, the volume expansion (or excess free volume, delta), a thermodynamic parameter directly related to the grain boundary energy, is represented by the normal component of the rigid body translation. Although its magnitude is small, it can be determined experimentally using statistical techniques which locate and fit the peak and valley positions in an experimental HREM image, i.e., a direct measurement of the lattice fringe displacements is made. We have modified the lattice fringe displacement technique such that a measurement accuracy of better than +/- 0.002a(0) can be achieved. Precise knowledge of the position and intensity of the image contrast and a detailed understanding of the sources of error are required. This paper provides a detailed description of the lattice fringe displacement technique as well as a detailed assessment of the sources of error in the measurement. RP BUCKETT, MI (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 21 TC 27 Z9 27 U1 1 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD NOV PY 1994 VL 56 IS 1-3 BP 71 EP 78 DI 10.1016/0304-3991(94)90147-3 PG 8 WC Microscopy SC Microscopy GA PV844 UT WOS:A1994PV84400008 ER PT J AU MILLS, MJ DAW, MS FOILES, SM AF MILLS, MJ DAW, MS FOILES, SM TI HIGH-RESOLUTION TRANSMISSION ELECTRON-MICROSCOPY STUDIES OF DISLOCATION CORES IN METALS AND INTERMETALLIC COMPOUNDS SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT International Symposium on High-Voltage and High-Resolution Electron Microscopy - Achievements and Future Developments CY FEB 21-24, 1994 CL MAX PLANCK INST METALLFORSCH, STUTTGART, GERMANY HO MAX PLANCK INST METALLFORSCH ID ALUMINUM SINGLE-CRYSTALS; EMBEDDED-ATOM-METHOD; TILT BOUNDARIES; ALLOYS; GLIDE; CREEP; DEFORMATION; SIMULATION; ENERGY; STRESS AB Considerations for the observation and analysis of dislocation cores in metals and intermetallics using high-resolution transmission electron microscopy are discussed. Specific examples treated are Lomer and 60 degrees dislocations in aluminum and a[011] edge dislocations in NiAl. The effect of thin-foil geometries on the structure and images of these dislocation cores is modeled using the Embedded Atom Method and image simulations. Some generalizations based on these calculations are discussed. Comparison of observed and simulated images enables determination of the spreading of the edge component of the cores, both in and out of the glide plane, which can have significant implications for the modeling of macroscopic behavior. RP MILLS, MJ (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. OI Foiles, Stephen/0000-0002-1907-454X NR 43 TC 33 Z9 34 U1 0 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD NOV PY 1994 VL 56 IS 1-3 BP 79 EP 93 DI 10.1016/0304-3991(94)90148-1 PG 15 WC Microscopy SC Microscopy GA PV844 UT WOS:A1994PV84400009 ER PT J AU ALLEN, CW AF ALLEN, CW TI IN-SITU ION-IRRADIATION AND ELECTRON-IRRADIATION EFFECTS STUDIES IN TRANSMISSION ELECTRON-MICROSCOPES SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT International Symposium on High-Voltage and High-Resolution Electron Microscopy - Achievements and Future Developments CY FEB 21-24, 1994 CL MAX PLANCK INST METALLFORSCH, STUTTGART, GERMANY HO MAX PLANCK INST METALLFORSCH ID INSITU; HVEM; INTERFACES; MIGRATION; CASCADES; SYSTEM AB Interfacing an ion accelerator to a transmission electron microscope (TEM) allows the analytical functions of TEM imaging and diffraction to be employed during ion-irradiation effects studies. The techniques and special procedures for performing quantitative TEM studies employing in situ ion and electron irradiation are summarized in the context of several irradiation-induced amorphization and irradiation-assisted crystallization studies, which illustrate the dynamics of this approach in the materials science of irradiation effects. RP ALLEN, CW (reprint author), ARGONNE NATL LAB,DIV MAT SCI,HVEM,TANDEM FACIL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 32 TC 15 Z9 15 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD NOV PY 1994 VL 56 IS 1-3 BP 200 EP 210 DI 10.1016/0304-3991(94)90159-7 PG 11 WC Microscopy SC Microscopy GA PV844 UT WOS:A1994PV84400020 ER PT J AU TIDWELL, VC GLASS, RJ AF TIDWELL, VC GLASS, RJ TI X-RAY AND VISIBLE-LIGHT TRANSMISSION FOR LABORATORY MEASUREMENT OF 2-DIMENSIONAL SATURATION FIELDS IN THIN-SLAB SYSTEMS SO WATER RESOURCES RESEARCH LA English DT Article ID POROUS-MEDIA; WATER-CONTENT; TOMOGRAPHY AB Two independent techniques, X ray absorption and light transmission, are developed and demonstrated for imaging transient saturation fields in thin-slab porous systems. The techniques yield full two-dimensional saturation fields with high spatial and temporal resolution. In the time required to make a single measurement by one of the traditional methods (e.g., gravimetric or gamma densitometry) an entire image consisting of hundreds of thousands of points is acquired by either the X ray or light technique. These methods are also very sensitive, capable of resolving a hundred or more levels of saturation at each of these points. Evaluation of these techniques is accomplished by direct comparison of X ray and light data as well as comparison with gravimetric and gamma densitometry data. Results of the comparison show very close agreement between the four techniques (on average within 5% saturation). These techniques represent useful tools for investigating processes governing unsaturated flow and transport through porous media. C1 SANDIA NATL LABS,DEPT GEOHYDROL,ALBUQUERQUE,NM 87185. NR 14 TC 92 Z9 99 U1 0 U2 8 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD NOV PY 1994 VL 30 IS 11 BP 2873 EP 2882 DI 10.1029/94WR00953 PG 10 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA PP213 UT WOS:A1994PP21300001 ER PT J AU LIU, BL PHILLIPS, FM FABRYKAMARTIN, JT FOWLER, MM STONE, WD AF LIU, BL PHILLIPS, FM FABRYKAMARTIN, JT FOWLER, MM STONE, WD TI COSMOGENIC CL-36 ACCUMULATION IN UNSTABLE LANDFORMS .1. EFFECTS OF THE THERMAL-NEUTRON DISTRIBUTION SO WATER RESOURCES RESEARCH LA English DT Article ID ACCELERATOR MASS-SPECTROMETRY; TERRESTRIAL ROCKS; PRODUCTION-RATES; COSMIC-RAYS; EXPOSURE; RADIOISOTOPES; CHLORINE-36; BE-10; AL-26; HE-3 AB Cosmogenic nuclides produced in situ within minerals at the surface of the Earth are proving to be an effective means of assessing geomorphic histories. The use of multiple cosmogenic nuclides permits both exposure times and erosion rates to be determined. However, if two nuclides are produced only by spallation reactions, the systematic differences in their accumulation rates depend only on the differences in their production rates and half-lives. The relatively small differences that result require a high degree of analytical precision to yield useful results. In contrast to other spallogenic nuclides, Cl-36 is also produced by low-energy neutron absorption, which creates a different pattern of production as a function of depth. We have measured the thermal flux with depth in a concrete block using He-3-filled neutron detectors. The measured thermal neutron profile agrees well with predictions from a simple diffusion-based thermal neutron distribution model. Calculations of Cl-36 production using the model suggest that the use of Cl-36 along with a purely spallogenic nuclide to determine erosion rates and exposure times should be less sensitive to analytical error than are determinations from two purely spallogenic nuclides. C1 LOS ALAMOS NATL LAB, DIV CHEM SCI & TECHNOL, LOS ALAMOS, NM 87545 USA. NEW MEXICO INST MIN & TECHNOL, DEPT MATH, SOCORRO, NM 87801 USA. RP LIU, BL (reprint author), NEW MEXICO INST MIN & TECHNOL, DEPT GEOSCI, SOCORRO, NM 87801 USA. NR 31 TC 75 Z9 77 U1 1 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD NOV PY 1994 VL 30 IS 11 BP 3115 EP 3125 DI 10.1029/94WR00761 PG 11 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA PP213 UT WOS:A1994PP21300023 ER PT J AU WANG, SJ AF WANG, SJ TI NONADIABATIC BERRY PHASE FOR LIGHT PROPAGATING IN AN OPTICAL-FIBER SO ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER LA English DT Article ID TOPOLOGICAL PHASE AB A Schrodinger-like equation for an approximate description of polarization for a photon propagating in a helix has been obtained. The analytical solution is employed to study the nonadiabatic Berry's phase, A new expression for Berry's phase is given, indicating a close link between the Berry's phase and spin-alignment. Two kinds of experiments are suggested to measure the nonadiabatic Berry's phase. C1 UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV NUCL SCI, BERKELEY, CA 94720 USA. LANZHOU UNIV, DEPT MODERN PHYS, LANZHOU 730000, PEOPLES R CHINA. RP WANG, SJ (reprint author), TH DARMSTADT, GESELL SCHWERIONENFORSCH, D-64220 DARMSTADT, GERMANY. NR 16 TC 3 Z9 4 U1 0 U2 0 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 NOV PY 1994 VL 96 IS 1 BP 97 EP 103 DI 10.1007/BF01313020 PG 7 WC Physics, Condensed Matter SC Physics GA PU959 UT WOS:A1994PU95900013 ER PT J AU WEISS, W STARKE, U SOMORJAI, GA AF WEISS, W STARKE, U SOMORJAI, GA TI LOW-ENERGY ELECTRONS (LEED, STM AND HREELS) IN THE MICROANALYTICAL CHARACTERIZATION OF COMPLEX SURFACE-STRUCTURES SO ANALYTICA CHIMICA ACTA LA English DT Article DE SURFACE TECHNIQUES; LOW ENERGY ELECTRONS; MICROANALYTICAL CHARACTERIZATION ID SCANNING TUNNELING MICROSCOPY; INITIAL EPITAXIAL-GROWTH; REAL-SPACE; THERMAL-DECOMPOSITION; PHASE-TRANSITION; TENSOR LEED; DIFFRACTION; PT(111); SI(111); RECONSTRUCTION AB The use of surface analytical techniques has created a broad knowledge of the geometric structures of even complex single-crystal surfaces and surface-adsorbate systems; which is essential to the understanding of their physical and chemical properties. Four techniques that use low-energy electrons as a probe are reviewed in this paper. These are low-energy electron diffraction (LEED), low-energy electron microscopy (LEEM), scanning tunneling microscopy (STM) and high-resolution electron energy loss spectroscopy (HREELS). Their experimental principles, theoretical backgrounds and specific capabilities in surface science studies are discussed. Recent examples of these techniques for structure determination of complex clean surfaces and complex adsorbate molecular systems are presented, with an emphasis on organic adsorbate molecules. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720. NR 53 TC 1 Z9 1 U1 1 U2 5 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 OCT 31 PY 1994 VL 297 IS 1-2 BP 109 EP 124 DI 10.1016/0003-2670(93)E0549-M PG 16 WC Chemistry, Analytical SC Chemistry GA PP620 UT WOS:A1994PP62000010 ER PT J AU SHERWIN, ME SIMMONS, JA EILES, TE HARFF, NE KLEM, JF AF SHERWIN, ME SIMMONS, JA EILES, TE HARFF, NE KLEM, JF TI PARALLEL QUANTUM POINT CONTACTS FABRICATED WITH INDEPENDENTLY BIASED GATES AND A SUBMICROMETER AIRBRIDGE POST SO APPLIED PHYSICS LETTERS LA English DT Article ID ELECTRON-BEAM LITHOGRAPHY AB Using an integrated airbridge and submicrometer gate post technology, coupled quantum point contacts (QPCs) arranged in a parallel configuration were fabricated. The airbridge and gate post are fabricated by e-beam lithography and Ti/Au evaporation in a single step. Gate post diameters as small as 0.1 mu m have been achieved. The two QPCs are fabricated with two conventional gates and a central airbridged gate, each of which can be biased independently. Conductance measurements clearly exhibit coupling of the two QPCs, as the quantized conductance steps are in units of 4 e(2)/h. Independent measurements of each QPC show conductance steps in units of 2 e(2)/h. RP SHERWIN, ME (reprint author), SANDIA NATL LABS,CTR CPDS SEMICOND TECHNOL,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 12 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 31 PY 1994 VL 65 IS 18 BP 2326 EP 2328 DI 10.1063/1.112731 PG 3 WC Physics, Applied SC Physics GA PP717 UT WOS:A1994PP71700028 ER PT J AU GROSSMANN, P FELDMANN, J GOBEL, EO THOMAS, P ARENT, DJ BERTNESS, KA OLSON, JM AF GROSSMANN, P FELDMANN, J GOBEL, EO THOMAS, P ARENT, DJ BERTNESS, KA OLSON, JM TI HOMOGENEOUS AND INHOMOGENEOUS LINEWIDTHS OF EXCITONS IN PARTIALLY ORDERED GA0.52IN0.48P SO APPLIED PHYSICS LETTERS LA English DT Article ID MULTIPLE-QUANTUM-WELLS; PHOTON-ECHO; PHOTOLUMINESCENCE; GA0.5IN0.5P; DEPENDENCE; ALLOYS; POLARIZATION AB We report picosecond four-wave mixing experiments on Ga0.52In0.48P grown by organometallic vapor phase epitaxy on GaAs substrates. The spectral behavior of the homogeneous linewidth in the range of the inhomogeneously broadened band gap excitonic resonance is found to be different for a more disordered as compared to a partially ordered structure. Whereas the former shows the normal alloy behavior, the behavior of the partially ordered sample supports the assumption that its structure consists of ordered domains with varying degrees of order. This means, in particular, that the main origin of the inhomogeneous broadening is different for the disordered and ordered case. In addition, a polarization dependence of the four-wave mixing signal is only observed for the more disordered sample. (C) 1994 American Institute of Physics. C1 UNIV MARBURG,CTR MAT SCI,D-35032 MARBURG,GERMANY. NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP GROSSMANN, P (reprint author), UNIV MARBURG,DEPT PHYS,D-35032 MARBURG,GERMANY. NR 22 TC 8 Z9 8 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 31 PY 1994 VL 65 IS 18 BP 2347 EP 2349 DI 10.1063/1.112742 PG 3 WC Physics, Applied SC Physics GA PP717 UT WOS:A1994PP71700035 ER PT J AU KIM, S KOCIC, A KOGUT, J AF KIM, S KOCIC, A KOGUT, J TI LOOKING FOR THE LOGARITHMS IN 4-DIMENSIONAL NAMBU-JONA-LASINIO MODELS SO NUCLEAR PHYSICS B LA English DT Article ID SYMMETRY-BREAKING; 4 DIMENSIONS; 4-FERMI THEORIES; FIELD AB We study the problem of triviality in the four-dimensional Nambu-Jona-Lasinio model with discrete chiral symmetry using both large-N expansions and lattice simulations. We find that logarithmic corrections to scaling appear in the equation of state as predicted by the large-N expansion. The data from 16(4) lattice simulations is sufficiently accurate to distinguish logarithmically trivial scaling from power law scaling. Simulations on different lattice sizes reveal an interesting interplay of finite size effects and triviality. We argue that such effects are qualitatively different for theories based on fundamental scalar rather than fermion fields. Several lessons learned here can be applied to simulations and analyses of more challenging field theories. C1 UNIV ILLINOIS, LOOMIS LAB PHYS, URBANA, IL 61801 USA. RP ARGONNE NATL LAB, DIV HIGH ENERGY PHYS, 9700 S CASS AVE, ARGONNE, IL 60439 USA. NR 41 TC 20 Z9 20 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD OCT 31 PY 1994 VL 429 IS 2 BP 407 EP 430 DI 10.1016/0550-3213(94)00260-6 PG 24 WC Physics, Particles & Fields SC Physics GA PP975 UT WOS:A1994PP97500008 ER PT J AU CORIANO, C PARWANI, RR AF CORIANO, C PARWANI, RR TI 3-LOOP EQUATION OF STATE OF QED AT HIGH-TEMPERATURE SO PHYSICAL REVIEW LETTERS LA English DT Article ID GAUGE VECTOR-MESONS; FINITE TEMPERATURE; QUANTUM CHROMODYNAMICS; FERMIONS; DENSITY; ENERGY; MATTER; ORDER; GAS AB We present the three-loop contribution (order e(4)) to the pressure of massless quantum electrodynamics at nonzero temperature. The calculation is performed within the imaginary time formalism. Dimensional regularization is used to handle the usual, intermediate stage, ultraviolet and infrared singularities, and also to prevent overcounting of diagrams during resummation. C1 CE SACLAY,SERV PHYS THEOR,F-91191 GIF SUR YVETTE,FRANCE. RP CORIANO, C (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,9700 S CASS,ARGONNE,IL 60439, USA. OI Coriano', Claudio/0000-0003-0479-8075 NR 20 TC 25 Z9 25 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 31 PY 1994 VL 73 IS 18 BP 2398 EP 2401 DI 10.1103/PhysRevLett.73.2398 PG 4 WC Physics, Multidisciplinary SC Physics GA PP693 UT WOS:A1994PP69300006 ER PT J AU BELKACEM, A GOULD, H FEINBERG, B BOSSINGHAM, R MEYERHOF, WE AF BELKACEM, A GOULD, H FEINBERG, B BOSSINGHAM, R MEYERHOF, WE TI PROJECTILE ENERGY AND ATOMIC-NUMBER DEPENDENCE OF ELECTRON-CAPTURE FROM PAIR PRODUCTION IN RELATIVISTIC HEAVY-ION COLLISIONS SO PHYSICAL REVIEW LETTERS LA English DT Article AB We report the first measurement of the energy dependence of electron capture from electron-positron pair production in relativistic heavy ion collisions. For a La57+ beam incident on Au, Ag, and Cu targets at energies of 0.405, 0.956, and 1.3 GeV/u we find that the cross sections for capture from pair production and the free pair production process increase with increasing collision energy at similar rates. Combining with uranium data reported previously gives a projectile atomic number dependence for 0.956 GeV/u ions on a Au target of Z(p)(6.54+/-0.65) for capture from pair production and Z(p)(1.53+/-0.80) for the free pair production process. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV ACCELERATOR & FUS RES,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305. RP BELKACEM, A (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BLDG 71-259,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 15 TC 32 Z9 32 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 31 PY 1994 VL 73 IS 18 BP 2432 EP 2435 DI 10.1103/PhysRevLett.73.2432 PG 4 WC Physics, Multidisciplinary SC Physics GA PP693 UT WOS:A1994PP69300015 ER PT J AU FOREST, CB KUPFER, K LUCE, TC POLITZER, PA LAO, LL WADE, MR WHYTE, DG WROBLEWSKI, D AF FOREST, CB KUPFER, K LUCE, TC POLITZER, PA LAO, LL WADE, MR WHYTE, DG WROBLEWSKI, D TI DETERMINATION OF THE NONINDUCTIVE CURRENT PROFILE IN TOKAMAK PLASMAS SO PHYSICAL REVIEW LETTERS LA English DT Article ID BOOTSTRAP CURRENT; CONFINEMENT; TRANSPORT AB The noninductive part of the measured current profile has been determined for DIII-D plasmas. A technique for determining the flux surface average of the quantity E . B and a model for the resistivity separates the current profile into inductive and noninductive portions. Analysis shows directly that neoclassical resistivity is adequate to explain the experimental observations, while Spitzer resistivity is not, and that a large noninductive current exists in plasmas for which large neutral beam current drive and pressure driven bootstrap currents are expected. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN. OAK RIDGE INST SCI & EDUC,OAK RIDGE,TN. CTR CANADIEN FUS MAGNET,VARENNES J3X 1S1,PQ,CANADA. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA. RP FOREST, CB (reprint author), GEN ATOM CO,SAN DIEGO,CA 92186, USA. NR 13 TC 110 Z9 110 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 31 PY 1994 VL 73 IS 18 BP 2444 EP 2447 DI 10.1103/PhysRevLett.73.2444 PG 4 WC Physics, Multidisciplinary SC Physics GA PP693 UT WOS:A1994PP69300018 ER PT J AU REINHOLD, CO BURGDORFER, J KIMURA, K MANNAMI, M AF REINHOLD, CO BURGDORFER, J KIMURA, K MANNAMI, M TI RAINBOW SCATTERING OF CONVOY ELECTRONS NEAR SURFACES SO PHYSICAL REVIEW LETTERS LA English DT Article ID GLANCING-ANGLE SCATTERING; FAST HEAVY-IONS; SINGLE-CRYSTAL; GRAZING-ANGLE; EMISSION; ACCELERATION; COLLISIONS; INCIDENT; SPECTRA; CHARGE AB We present a microscopic simulation of convoy electron emission in glancing-angle ion-surface scattering which accounts for both dynamic image interactions and multiple scattering. We find that the position and shape of the convoy peak are determined by rainbow scattering of electrons in the dynamically screened field of the ion. The nonclassical contribution to rainbow scattering is estimated using a uniform semiclassical approach. Core polarization is shown to contribute significantly to dynamical screening. Good agreement with experiment is found for Li+-SnTe(001) collisions. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. KYOTO UNIV,DEPT ENGN SCI,KYOTO 606,JAPAN. RP REINHOLD, CO (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. OI Reinhold, Carlos/0000-0003-0100-4962 NR 27 TC 32 Z9 32 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 OCT 31 PY 1994 VL 73 IS 18 BP 2508 EP 2511 DI 10.1103/PhysRevLett.73.2508 PG 4 WC Physics, Multidisciplinary SC Physics GA PP693 UT WOS:A1994PP69300034 ER PT J AU FEIBELMAN, PJ AF FEIBELMAN, PJ TI GETTING FUNDED - THE FINE ART OF RESEARCH PROPOSAL WRITING SO SCIENTIST LA English DT Editorial Material AB In the final installment of a three-part series of excerpts from his book A Ph.D. Is Not Enough!, physicist Peter Feibelman offers tips on proposal writing to young scientists. RP FEIBELMAN, PJ (reprint author), SANDIA NATL LABS,TECH STAFF,ALBUQUERQUE,NM 87185, USA. NR 1 TC 0 Z9 0 U1 1 U2 4 PU SCIENTIST INC PI PHILADELPHIA PA 3600 MARKET ST SUITE 450, PHILADELPHIA, PA 19104 SN 0890-3670 J9 SCIENTIST JI Scientist PD OCT 31 PY 1994 VL 8 IS 21 BP 23 EP 23 PG 1 WC Information Science & Library Science; Multidisciplinary Sciences SC Information Science & Library Science; Science & Technology - Other Topics GA PP023 UT WOS:A1994PP02300017 ER PT J AU KOVNER, A KURZEPA, PS AF KOVNER, A KURZEPA, PS TI FERMIONS FROM PHOTONS - BOSONIZATION OF QED IN 2+1 DIMENSIONS SO INTERNATIONAL JOURNAL OF MODERN PHYSICS A LA English DT Article ID MASSIVE SCHWINGER MODEL; SINE-GORDON EQUATION; 2 DIMENSIONS; SPIN; STATISTICS; LATTICE; GAUGE; SOLITONS; FIELD; REPRESENTATION AB We perform the complete bosonization of (2+1)-dimensional QED with one fermionic flavor in the Hamiltonian formalism. The Fermi operators are explicitly constructed in terms of the vector potential and the electric field. We carefully specify the regularization procedure involved in the definition of these operators, and calculate the fermionic bilinears and the energy-momentum tensor. The algebra of bilinears exhibits the Schwinger terms which also appear in perturbation theory. The bosonic Hamiltonian is a local, polynomial functional of A(i) and E(i), and we check explicitly the Lorentz invariance of the resulting bosonic theory. Our construction is conceptually very similar to Mandelstam's construction in 1+1 dimensions, and is dissimilar from the recent bosonization attempts in 2+1 dimensions, which hinge crucially on the presence of a Chern-Simons term. RP KOVNER, A (reprint author), LOS ALAMOS NATL LAB,DIV THEORY,T-8,MS B-285,LOS ALAMOS,NM 87545, USA. NR 46 TC 5 Z9 5 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-751X J9 INT J MOD PHYS A JI Int. J. Mod. Phys. A PD OCT 30 PY 1994 VL 9 IS 27 BP 4669 EP 4700 DI 10.1142/S0217751X94001862 PG 32 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA PM257 UT WOS:A1994PM25700001 ER PT J AU GUTHRIDGE, CJ STAMPFER, MR CLARK, MA STEINER, MR AF GUTHRIDGE, CJ STAMPFER, MR CLARK, MA STEINER, MR TI PHOSPHOLIPASES A(2) IN RAS-TRANSFORMED AND IMMORTALIZED HUMAN MAMMARY EPITHELIAL-CELLS SO CANCER LETTERS LA English DT Article DE PHOSPHOLIPASE A(2); RAS ONCOGENE; HUMAN MAMMARY EPITHELIAL CELLS; ARACHIDONIC ACID ID PROTEIN-KINASE-C; GROUP-II PHOSPHOLIPASE-A2; EPIDERMAL-GROWTH-FACTOR; BREAST-CANCER CELLS; ARACHIDONIC-ACID RELEASE; VASCULAR SMOOTH-MUSCLE; TUMOR-NECROSIS-FACTOR; CYTOSOLIC PHOSPHOLIPASE-A2; SIGNAL-TRANSDUCTION; PHOSPHATIDYLCHOLINE HYDROLYSIS AB Phospholipase A(2) (PLA(2)) activities of non-tumorigenic and tumorigenic human mammary epithelial cells, 184B5 cells (immortalized cell line from a reduction mammoplasty) and B5KTu cells (cells from a tumor induced by ras-transformed 184B5 cells), are characterized, with emphasis on lipid biomediator-related phospholipases A(2). Phospholipases A(2) associated with regulation of arachidonic acid metabolism include the high molecular mass cytosolic PLA(2) (cPLA(2)) and group II PLA(2). The major PLA(2) activity in the mammary epithelial cells has the characteristics of cPLA(2); this activity is higher in the B5KTu cells. In contrast, the 184B5 and B5KTu cells have similar levels of a Ca2+-independent, cytosolic PLA(2) activity and low levels of a particulate fraction PLA(2) activity, which does not have the properties of group II PLA(2). Thus, cPLA(2) activity is selectively elevated in the tumorigenic human mammary epithelial cells and this may result in increased generation of lipid biomediators such as arachidonic acid metabolites. C1 UNIV KENTUCKY,MED CTR,DEPT MICROBIOL & IMMUNOL,LEXINGTON,KY 40536. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. SCHERING PLOUGH CORP,RES LAB,KENILWORTH,NJ 07033. FU NCI NIH HHS [CA-24844] NR 78 TC 23 Z9 24 U1 0 U2 0 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0304-3835 J9 CANCER LETT JI Cancer Lett. PD OCT 28 PY 1994 VL 86 IS 1 BP 11 EP 21 DI 10.1016/0304-3835(94)90175-9 PG 11 WC Oncology SC Oncology GA PQ845 UT WOS:A1994PQ84500003 PM 7954346 ER PT J AU DEES, C GODFREY, VL FOSTER, JS SCHULTZ, RD TRAVIS, CC AF DEES, C GODFREY, VL FOSTER, JS SCHULTZ, RD TRAVIS, CC TI STABILIZATION OF THE P53 GENE-PRODUCT IN 2 BOVINE LEUKEMIA-VIRUS INFECTED CELL-LINES SO CANCER LETTERS LA English DT Article DE P53; RETROVIRUS; TUMOR PROGRESSION ID TRANSACTIVATOR PROTEIN; ACTIVATING MUTATIONS; RAS ONCOGENE; TRANSFORMATION; COOPERATION; ANTIGEN; BIND AB Fetal lamb kidney cells (FLK) and bat lung (BAT,CM) cells that continuously produce bovine leukemia virus (BLV) were found to cause malignant tumors in nude mice. Uninfected bat lung cells (Tb 1 Lu) produced a small benign neoplasm. Pulse chase studies showed that the p53 gene product in BAT(2)CL6 cells was more stable compared with p53 in Tb 1 Lu cells. Mono-clonal antibody studies suggested that a mutant form of the p53 protein was produced in BLV-infected cells. Heteroduplex mapping studies of the p53 gene from BLV-infected cells also suggested that a mutation in p53 had occurred. Stabilization of the p53 gene product in BLV-infected cells may contribute to the progression of tumor virulence. C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. UNIV TENNESSEE,MED CTR,KNOXVILLE,TN 37920. UNIV WISCONSIN,SCH VET MED,DEPT PATHOBIOL,MADISON,WI 53706. RP DEES, C (reprint author), OAK RIDGE NATL LAB,DIV HLTH SCI RES,RISK ANAL SECT,MOLEC TOXICOL GRP,POB 2008,BLDG 4500S,OAK RIDGE,TN 37831, USA. NR 21 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0304-3835 J9 CANCER LETT JI Cancer Lett. PD OCT 28 PY 1994 VL 86 IS 1 BP 33 EP 40 DI 10.1016/0304-3835(94)90177-5 PG 8 WC Oncology SC Oncology GA PQ845 UT WOS:A1994PQ84500005 PM 7954352 ER PT J AU NEWBURGER, J DELANGE, B GUIOCHON, G AF NEWBURGER, J DELANGE, B GUIOCHON, G TI NEW DISPLACEMENT TECHNIQUE FOR PREPARATIVE LIQUID-CHROMATOGRAPHY SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article ID ELUTION CHROMATOGRAPHY; 2-COMPONENT MIXTURE; LANGMUIR ISOTHERM; IDEAL MODEL; OPTIMIZATION; SEPARATION AB A new hybrid displacement technique (patent pending) for separating mixtures which incorporates the positive aspects of displacement chromatography and sample self-displacement, has been developed. Immediately after injection of the separation mixture, a relatively large, but finite amount of an inert material is injected onto the column to act as a ''displacing compound''. The purpose of this displacing compound is to drive the separation by providing additional adsorption site competition, thus enhancing the displacement effect. It functions to help maintain the concentrations of the actual separation components so that tailing and/or fronting, yield limiting factors in sample self-displacement, are mitigated. The displacing compound is distinct from a true displacer because it is introduced in a limited quantity at the outset of the separation, not as a continuous additive. Feasibility has been demonstrated and operational parameters investigated. Using a displacing compound sharpens zone boundaries between mixture components. The practical significance of this effect includes increased loading capability and the ability to achieve high yields when the major component elutes first. The impact of adding a displacing compound is greater when the separation factors (alpha) between the mixture components are smaller. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. BRISTOL MYERS SQUIBB PHARMACEUT RES INST,PRINCETON,NJ 08543. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 9 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD OCT 28 PY 1994 VL 684 IS 1 BP 1 EP 11 DI 10.1016/S0021-9673(94)89126-5 PG 11 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA PP728 UT WOS:A1994PP72800001 ER PT J AU CALDWELL, CD KRAUSE, MO AF CALDWELL, CD KRAUSE, MO TI ELECTRON-EMISSION ANALYSIS OF THE 2P(4)(1-D)NS, ND RYDBERG EXCITATIONS IN ATOMIC FLUORINE SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID PHOTOELECTRON-SPECTROSCOPY; PHOTOIONIZATION; XE AB We have observed the autoionizing Rydberg series converging to the F+ 2p(4)(D-1(2)) limit by way of photoelectron spectrometry with synchrotron radiation using a monochromator bandpass of 0.012 nm. The energy data are in good agreement with earlier results. The relative intensity of the 2p(4)(S-1)3s(S-2(1/2)) feature arising from the P-2(3/2) ground state was found to be small, and previous discrepancies concerning this resonance could not be resolved. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP CALDWELL, CD (reprint author), UNIV CENT FLORIDA,DEPT PHYS,ORLANDO,FL 32816, USA. NR 16 TC 10 Z9 11 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD OCT 28 PY 1994 VL 27 IS 20 BP 4891 EP 4896 DI 10.1088/0953-4075/27/20/008 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA PQ117 UT WOS:A1994PQ11700008 ER PT J AU BALTZER, P LUNDQVIST, M WANNBERG, B KARLSSON, L LARSSON, M HAYES, MA WEST, JB SIGGEL, MRF PARR, AC DEHMER, JL AF BALTZER, P LUNDQVIST, M WANNBERG, B KARLSSON, L LARSSON, M HAYES, MA WEST, JB SIGGEL, MRF PARR, AC DEHMER, JL TI INNER-VALENCE STATES OF CO+ BETWEEN 22-EV AND 46-EV STUDIED BY HIGH-RESOLUTION PHOTOELECTRON-SPECTROSCOPY AND AB-INITIO CI CALCULATIONS SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID CONFIGURATION-INTERACTION CALCULATIONS; CARBON-MONOXIDE; ELECTRONIC-STRUCTURE; SATELLITE STRUCTURE; PHOTO-IONIZATION; MOLECULES; SPECTRA; N-2; INTENSITIES; O2 AB Photoionization of the CO molecule and inner-valence states of CO+ between 22 and 45 eV have been studied by means of photoelectron spectroscopy using both synchrotron radiation and He II radiation. Vibrational structure has been resolved in many bands up to 45 eV. CASSCF (complete active space self-consistent field) and MRCI (multireference configuration interaction) calculations of potential curves in the 22-30 eV range have been performed and these have been used to predict vibrational levels and Franck-Condon factors. In this energy range three valence states, D 2 Pi, 3(2) Sigma(+) and 3(2) Pi have been identified, and spectroscopic constants have been determined for the first two of these. Above 30 eV, all valence states have been found to be repulsive. In addition to the broad bands expected for these states, several progressions of narrow lines are observed most probably reflecting transitions to Rydberg states. C1 ROYAL INST TECHNOL,S-10044 STOCKHOLM,SWEDEN. SERC,DARESBURY LAB,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND. NIST,GAITHERSBURG,MD 20899. ARGONNE NATL LAB,ARGONNE,IL 60439. RP BALTZER, P (reprint author), UNIV UPPSALA,DEPT PHYS,BOX 530,S-75121 UPPSALA,SWEDEN. NR 44 TC 57 Z9 57 U1 0 U2 4 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 OCT 28 PY 1994 VL 27 IS 20 BP 4915 EP 4932 DI 10.1088/0953-4075/27/20/011 PG 18 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA PQ117 UT WOS:A1994PQ11700011 ER PT J AU BLUM, O FRITZ, IJ SHUL, RJ SCHNEIDER, RP HOWARD, AJ AF BLUM, O FRITZ, IJ SHUL, RJ SCHNEIDER, RP HOWARD, AJ TI INGAP/ALINGAP QUANTUM-WELL SURFACE NORMAL MODULATORS FOR VISIBLE WAVELENGTHS SO ELECTRONICS LETTERS LA English DT Article DE SEMICONDUCTOR QUANTUM WELLS; ELECTROABSORPTION MODULATORS; REFLECTION MODULATORS AB An InGaP/AlInGaP, surface normal, multiquantum well modulator operating at visible wavelengths is reported for the first time. Application of -6V perpendicular to the plane of the quantum wells produces a 15% change in transmission at 645 nm, caused by a change in absorption in excess of 2900 cm(-1). RP BLUM, O (reprint author), SANDIA NATL LABS,DEPT 1312,MS 0603,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 11 TC 4 Z9 4 U1 0 U2 1 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD OCT 27 PY 1994 VL 30 IS 22 BP 1885 EP 1887 DI 10.1049/el:19941241 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA PT079 UT WOS:A1994PT07900053 ER PT J AU LU, DS WILLARD, D PATEL, IR KADWELL, S OVERTON, L KOST, T LUTHER, M CHEN, WB WOYCHIK, RP WILKISON, WO CONE, RD AF LU, DS WILLARD, D PATEL, IR KADWELL, S OVERTON, L KOST, T LUTHER, M CHEN, WB WOYCHIK, RP WILKISON, WO CONE, RD TI AGOUTI PROTEIN IS AN ANTAGONIST OF THE MELANOCYTE-STIMULATING-HORMONE RECEPTOR SO NATURE LA English DT Article ID MOLECULAR-CLONING; MELANOCORTIN RECEPTOR; EXPRESSION; LOCUS; ASSAY; CELLS; MICE AB THE genetic loci agouti and extension control the relative amounts of eumelanin (brown-black) and phaeomelanin (yellow-red) pigments in mammals(1): extension encodes the receptor for melanocyte-stimulating hormone (MSH)(2) and agouti encodes a novel 131-amino-acid protein containing a signal sequence(3,4). Agouti, which is produced in the hair follicle(5), acts on follicular melanocytes(6) to inhibit alpha-MSH-induced eumelanin production, resulting in the subterminal band of phaeomelanin often visible in mammalian fur. Here we use partially purified agouti protein to demonstrate that agouti is a high-affinity antagonist of the MSH receptor and blocks alpha-MSH stimulation of adenylyl cyclase, the effector through which alpha-MSH induces eumelanin synthesis, Agouti was also found to be an antagonist of the melanocortin-4 receptor(7,8), a related MSH-binding receptor. Consequently, the obesity caused by ectopic expression of agouti in the lethal yellow (A(y)) mouse(9) may be due to the inhibition of melanocortin reteptor(s) outside the hair follicle. C1 GLAXO INC, RES INST, DIV MOLEC SCI, RES TRIANGLE PK, NC 27709 USA. OREGON HLTH SCI UNIV, VOLLUM INST ADV BIOMED RES, PORTLAND, OR 97201 USA. OAK RIDGE NATL LAB, DIV BIOL, OAK RIDGE, TN 37831 USA. NR 25 TC 772 Z9 791 U1 1 U2 33 PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 EI 1476-4687 J9 NATURE JI Nature PD OCT 27 PY 1994 VL 371 IS 6500 BP 799 EP 802 DI 10.1038/371799a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PP018 UT WOS:A1994PP01800060 PM 7935841 ER PT J AU SCHLICHTING, I BERENDZEN, J PHILLIPS, GN SWEET, RM AF SCHLICHTING, I BERENDZEN, J PHILLIPS, GN SWEET, RM TI CRYSTAL-STRUCTURE OF PHOTOLYZED CARBONMONOXY-MYOGLOBIN SO NATURE LA English DT Article ID LIGAND-BINDING; HEME-PROTEINS; MOLECULAR-DYNAMICS; PHOTOPRODUCTS; RESOLUTION; MONOXIDE; RAMAN; CRYSTALLOGRAPHY; DIFFRACTION; REFINEMENT AB MYOGLOBIN is a globular haem protein that reversibly binds ligands such as O-2 and CO. Single photons of visible light can break the covalent bond between CO and the haem iron in carbon-monoxy-myoglobin (MbCO) and thus form an unstable intermediate, Mb*CO, with the CO inside the protein(1,2). The ensuing rebinding process has been extensively studied as a model for the interplay of dynamics, structure and function in protein reactions. We have used X-ray crystallography at liquid-helium temperatures to determine the structure of Mb*CO to a resolution of 1.5 Angstrom. The photodissociated CO lies on top of the haem pyrrole ring C. Comparison with the CO-bound and unligated myoglobin structures reveals that on photodissociation of the CO, the haem 'domes', the iron moves partially out of the haem plane, the iron-proximal histidine bond is compressed, the F helix is strained and the distal histidine swings towards the outside of the ligand-binding pocket. C1 MAX PLANCK INST MED RES,DEPT BIOPHYS,D-69120 HEIDELBERG,GERMANY. RICE UNIV,WM KECK CTR COMPUTAT BIOL,HOUSTON,TX 77251. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RI Schlichting, Ilme/I-1339-2013 NR 31 TC 321 Z9 323 U1 4 U2 28 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD OCT 27 PY 1994 VL 371 IS 6500 BP 808 EP 812 DI 10.1038/371808a0 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PP018 UT WOS:A1994PP01800063 PM 7935843 ER PT J AU BARBIERI, R HALL, LJ AF BARBIERI, R HALL, LJ TI SIGNALS FOR SUPERSYMMETRIC UNIFICATION SO PHYSICS LETTERS B LA English DT Article ID GRAND UNIFIED THEORIES; N=1 SUPERGRAVITY; TOP-QUARK; WEAK; CONSERVATION; BREAKING; SEARCH; SCALE; SU(5); MASS AB Using the Yukawa couplings of the minimal supersymmetric SU(5) model, the rates for mu --> e gamma, mu -->, e conversion, mu --> 3e and tau --> mu gamma are computed. For a selectron mass of 100 GeV, and without exploring the full parameter space, we find rates which are one order of magnitude beneath present experimental bounds. It is argued that these relatively large rates have a wide applicability, so that lepton flavor violating signals provide a more general test of supersymmetric unification than can be obtained from either proton decay or neutrino masses. C1 IST NAZL FIS NUCL,PISA,ITALY. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. RP BARBIERI, R (reprint author), UNIV PISA,PISA,ITALY. NR 28 TC 325 Z9 325 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 OCT 27 PY 1994 VL 338 IS 2-3 BP 212 EP 218 DI 10.1016/0370-2693(94)91368-4 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PP115 UT WOS:A1994PP11500017 ER PT J AU RAMBERG, EJ BOCK, GJ COLEMAN, R CRISLER, M ENAGONIO, J FORD, R HSIUNG, YB JENSEN, DA TSCHIRHART, R ARISAKA, K ROBERTS, D SLATER, W WEAVER, M BRIERE, RA CHEU, E HARRIS, DA KROLAK, P MAKOFF, G MCFARLAND, KS ROODMAN, A SCHWINGENHEUER, B SOMALWAR, S WAH, YW WINSTEIN, B WINSTON, R BARKER, AR SWALLOW, EC COLLINS, EM GOLLIN, GD NAKAYA, T YAMANAKA, T GU, P HAAS, P HOGAN, WP KIM, S MATTHEWS, JN MYUNG, SS SCHNETZER, S THOMSON, G ZOU, Y AF RAMBERG, EJ BOCK, GJ COLEMAN, R CRISLER, M ENAGONIO, J FORD, R HSIUNG, YB JENSEN, DA TSCHIRHART, R ARISAKA, K ROBERTS, D SLATER, W WEAVER, M BRIERE, RA CHEU, E HARRIS, DA KROLAK, P MAKOFF, G MCFARLAND, KS ROODMAN, A SCHWINGENHEUER, B SOMALWAR, S WAH, YW WINSTEIN, B WINSTON, R BARKER, AR SWALLOW, EC COLLINS, EM GOLLIN, GD NAKAYA, T YAMANAKA, T GU, P HAAS, P HOGAN, WP KIM, S MATTHEWS, JN MYUNG, SS SCHNETZER, S THOMSON, G ZOU, Y TI POLARIZATION OF LAMBDA-PRODUCED AND (LAMBDA)OVER-BAR-PRODUCED BY 800-GEV PROTONS SO PHYSICS LETTERS B LA English DT Article ID MAGNETIC-MOMENT; SIGMA+ AB We have measured the polarization of Lambda and <(Lambda)over bar> hyperons produced by 800 GeV protons on a Be target at a fixed targeting angle of 4.8 mrad. Comparison with previous data at 400 GeV production energy and twice the targeting angle shows no significant energy dependence for the Lambda polarization. This is in striking contrast to the energy dependence found for Sigma(+) and Xi(-) polarizations. We find no evidence for <(Lambda)over bar> polarization at 800 GeV. C1 UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637. UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637. UNIV COLORADO,DEPT PHYS,BOULDER,CO 80309. UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. OSAKA UNIV,DEPT PHYS,TOYONAKA,OSAKA 560,JAPAN. RUTGERS STATE UNIV,DEPT PHYS,PISCATAWAY,NJ 08855. ELMHURST COLL,DEPT PHYS,ELMHURST,IL 60126. RP RAMBERG, EJ (reprint author), FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. RI Briere, Roy/N-7819-2014 OI Briere, Roy/0000-0001-5229-1039 NR 14 TC 45 Z9 46 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD OCT 27 PY 1994 VL 338 IS 2-3 BP 403 EP 408 DI 10.1016/0370-2693(94)91397-8 PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PP115 UT WOS:A1994PP11500046 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, I ALEKSAN, R ALEKSEEV, GD ALLPORT, PP ALMEHED, S ALMEIDA, FML ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BAUDOT, J BECKS, KH BEGALLI, M BEILLIERE, P BELOUS, K BELTRAN, P BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLOCKI, J BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUGGE, L BURAN, T BUYS, A CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASES, R CASO, C GIMENEZ, MV CATTAI, A CAVALLO, E CERRITO, L CHABAUD, V CHAN, A CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COSSUTTI, F COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVIES, J DASILVA, W DEFOIX, C DELLARICCA, G DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C LASO, MDMD LAVAISSIERE, CD DELOTTO, B DEMIN, A DEPAULA, L DESAINTJEAN, C DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, E EDSALL, D EHRET, R EKELOF, T EKSPONG, G ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, E FORMENTI, F FOUSSET, JL FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GELE, D GERBER, JP GILLESPIE, D GOKIELI, R GOLOB, B GOLOVATYUK, VM GOMEZ, JJ CADENAS, Y GOPAL, G GORN, L GORSKI, M GRACCO, V GRARD, F GRAZIANI, E GROSDIDIER, G GUNNARSSON, P GUY, J HAEDINGER, U HAHN, F HAHN, S HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERNANDO, JA HERQUET, P HERR, H HESSING, TL HIGON, E HILKE, HJ HILL, TS HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HONORE, PE HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JACOBSSON, R JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONSSON, L JUILLOT, P KAISER, M KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATARGIN, A KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUPINSKI, W KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAKTINEH, I LAMBROPOULOS, C LAMSA, JW LANCERI, L LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEKJ, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTI, S MARTINEZRIVERO, C MARTINEZVIDAL, F MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NEMECEK, S NEUMANN, W NICOLAIDOU, R NIELSEN, BS NIKOLAENKO, V NISS, P NOMEROTSKI, A NORMAND, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PEREVOZCHIKOV, V PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PHILLIPS, HT PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G RIPP, I ROMERO, A RONCAGLIOLO, I RONCHESE, P ROOS, L ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKAALI, TB SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVITSKI, I STAVROPOULOS, G STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M TABARELLI, T TCHIKILEV, O THEODOSIOU, GE THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORASSA, E TORTORA, L TRANSTROMER, G TREILLE, D TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VANELDIK, J VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YIP, K YUSHCHENKO, O ZACH, F ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMM, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G AF ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, I ALEKSAN, R ALEKSEEV, GD ALLPORT, PP ALMEHED, S ALMEIDA, FML ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARDIN, DY BARKER, GJ BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BAUDOT, J BECKS, KH BEGALLI, M BEILLIERE, P BELOUS, K BELTRAN, P BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLOCKI, J BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BRILLAULT, L BROWN, RCA BRUCKMAN, P BRUNET, JM BUGGE, L BURAN, T BUYS, A CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASES, R CASO, C GIMENEZ, MV CATTAI, A CAVALLO, E CERRITO, L CHABAUD, V CHAN, A CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COSSUTTI, F COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVIES, J DASILVA, W DEFOIX, C DELLARICCA, G DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C LASO, MDMD LAVAISSIERE, CD DELOTTO, B DEMIN, A DEPAULA, L DESAINTJEAN, C DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, E EDSALL, D EHRET, R EKELOF, T EKSPONG, G ELSING, M ENGEL, JP ERSHAIDAT, N SANTO, ME FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, E FORMENTI, F FOUSSET, JL FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GELE, D GERBER, JP GILLESPIE, D GOKIELI, R GOLOB, B GOLOVATYUK, VM GOMEZ, JJ CADENAS, Y GOPAL, G GORN, L GORSKI, M GRACCO, V GRARD, F GRAZIANI, E GROSDIDIER, G GUNNARSSON, P GUY, J HAEDINGER, U HAHN, F HAHN, S HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K HAO, W HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ HERNANDO, JA HERQUET, P HERR, H HESSING, TL HIGON, E HILKE, HJ HILL, TS HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D HONORE, PE HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JACOBSSON, R JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONSSON, L JUILLOT, P KAISER, M KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATARGIN, A KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KRAMMER, M KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUPINSKI, W KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAKTINEH, I LAMBROPOULOS, C LAMSA, JW LANCERI, L LANGEFELD, P LAPIN, V LAST, I LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEKJ, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J MARECHAL, B MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T MARTI, S MARTINEZRIVERO, C MARTINEZVIDAL, F MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MICHELOTTO, M MIGLIORE, E MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NEMECEK, S NEUMANN, W NICOLAIDOU, R NIELSEN, BS NIKOLAENKO, V NISS, P NOMEROTSKI, A NORMAND, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PEREVOZCHIKOV, V PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PHILLIPS, HT PIANA, G PIERRE, F PIMENTA, M PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, J RIDKY, J RINAUDO, G RIPP, I ROMERO, A RONCAGLIOLO, I RONCHESE, P ROOS, L ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKAALI, TB SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVITSKI, I STAVROPOULOS, G STEPANIAK, K STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M TABARELLI, T TCHIKILEV, O THEODOSIOU, GE THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B TORASSA, E TORTORA, L TRANSTROMER, G TREILLE, D TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VANELDIK, J VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YIP, K YUSHCHENKO, O ZACH, F ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZIMM, NI ZITO, M ZONTAR, D ZUBERI, R ZUMERLE, G TI MEASUREMENT OF TIME-DEPENDENT B-D(0) (B)OVER-BAR-D(0) MIXING SO PHYSICS LETTERS B LA English DT Article AB The time dependent mixing of B-d(0)-(B) over bar(d)(0) mesons has been observed by using the correlations between the charge of D-* mesons and the weighted mean charge of particles in each hemisphere. From a reconstructed D-*+/- sample corresponding to about 1.7 million hadronic Z(0) decays, the mass difference between the two B-d(0) mass eigenstates has been measured to be hm = 0.50 +/- 0.12 (stat.) +/- 0.06 (syst.) (h) over bar/ps or, converting into eV/c(2): Delta m = [3.29 +/- 0.79 (stat.) +/- 0.39 (syst.)] 10(-4) eV/c(2). C1 UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. FREE UNIV BRUSSELS,VUB,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. COLL FRANCE,PHYS CORPUSCULAIRE LAB,CNRS,IN2P3,F-75231 PARIS 05,FRANCE. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV STRASBOURG 1,CTR RECH NUCL,CNRS,IN2P3,F-67037 STRASBOURG,FRANCE. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. FZU,CAS HIGH ENERGY PHYS DIV,INST PHYS,CR-18040 PRAGUE 8,CZECH REPUBLIC. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. IST NAZL FIS NUCL,I-16146 GENOA,ITALY. UNIV GRENOBLE 1,INST SCI NUCL,CNRS,IN2P3,F-38026 GRENOBLE,FRANCE. SEFT,HIGH ENERGY PHYS RES INST,SF-00014 HELSINKI,FINLAND. JOINT INST NUCL RES DUBNA,MOSCOW 101000,RUSSIA. UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76128 KARLSRUHE,GERMANY. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. LIP,IST,FCUL,P-1000 LISBON,PORTUGAL. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,MERSEYSIDE,ENGLAND. UNIV PARIS 06,LPNHE,CNRS,IN2P3,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,F-75252 PARIS 05,FRANCE. LUND UNIV,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV LYON 1,IPNL,CNRS,IN2P3,F-69622 VILLEURBANNE,FRANCE. UNIV COMPLUTENSE,E-28040 MADRID,SPAIN. UNIV AIX MARSEILLE 2,CPP,CNRS,IN2P3,F-13288 MARSEILLE 09,FRANCE. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. IST NAZL FIS NUCL,I-20133 MILAN,ITALY. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. CHARLES UNIV,NUCL CTR MFF,CR-18000 PRAGUE 8,CZECH REPUBLIC. NIKHEF H,1009 DB AMSTERDAM,NETHERLANDS. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV OVIEDO,DEPT FIS,E-33006 OVIEDO,SPAIN. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. IST NAZL FIS NUCL,I-35131 PADUA,ITALY. PONTIFICIA UNIV CATOLICA RIO DE JANEIRO,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV ROMA TOR VERGATA,DIPARTIMENTO FIS,I-00173 ROME,ITALY. IST NAZL FIS NUCL,I-00173 ROME,ITALY. CTE ETUD SACLAY,DSM,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. IST SUPER SANITA,IST NAZL FIS NUCL,I-00161 ROME,ITALY. UNIV CANTABRIA,CSIC,CEAFM,E-39006 SANTANDER,SPAIN. INST HIGH ENERGY PHYS,PROTVINO,RUSSIA. UNIV LJUBLJANA,JOZEF STEFAN INST,LJUBLJANA 61000,SLOVENIA. UNIV LJUBLJANA,DEPT PHYS,LJUBLJANA 61000,SLOVENIA. UNIV STOCKHOLM,S-11385 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 UDINE,IST FIS,I-33100 UDINE,ITALY. FED UNIV RIO DE JANEIRO,BR-21945970 RIO JANEIRO,BRAZIL. UPPSALA UNIV,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. CSIC,IFIC,E-46100 BURJASSOT,SPAIN. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. OSTERR AKAD WISSENSCH,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV WUPPERTAL,FACHBEREICH PHYS,D-42097 WUPPERTAL 1,GERMANY. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP ABREU, P (reprint author), UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,IN2P3,CNRS,BAT 200,F-91405 ORSAY,FRANCE. RI 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; Monge, Maria Roberta/G-9127-2012; Nemecek, Stanislav/G-5931-2014; Ridky, Jan/H-6184-2014; Tome, Bernardo/J-4410-2013; Fernandez, Ester/K-9734-2014; Espirito Santo, Maria Catarina/L-2341-2014; Pimenta, Mario/M-1741-2013; Contreras Gonzalez, Jose Luis/K-7255-2014; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; Hernando Morata, Jose Angel/L-7642-2014; gandelman, miriam/N-3739-2014; Ragazzi, Stefano/D-2463-2009; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Lozano-Bahilo, Julio/F-4881-2016; Della Ricca, Giuseppe/B-6826-2013; Olshevskiy, Alexander/I-1580-2016; Rames, Jiri/H-2450-2014; Paganoni, Marco/A-4235-2016; Andreazza, Attilio/E-5642-2011; Nomerotski, Andrei/A-5169-2010; Verlato, Marco/J-4604-2012; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Krammer, Manfred/A-6508-2010; De Saint Jean, Cyrille/E-8853-2011; Shellard, Ronald/G-4825-2012; Petrolini, Alessandro/H-3782-2011; Torassa, Ezio/I-1788-2012; Fruhwirth, Rudolf/H-2529-2012 OI Dracos, Marcos/0000-0003-0514-193X; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Tome, Bernardo/0000-0002-7564-8392; Espirito Santo, Maria Catarina/0000-0003-1286-7288; Pimenta, Mario/0000-0002-2590-0908; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Hernando Morata, Jose Angel/0000-0002-8683-5142; Ragazzi, Stefano/0000-0001-8219-2074; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Lozano-Bahilo, Julio/0000-0003-0613-140X; Della Ricca, Giuseppe/0000-0003-2831-6982; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Andreazza, Attilio/0000-0001-5161-5759; Verlato, Marco/0000-0003-1967-7655; Ruiz, Alberto/0000-0002-3639-0368; Krammer, Manfred/0000-0003-2257-7751; Shellard, Ronald/0000-0002-2983-1815; Petrolini, Alessandro/0000-0003-0222-7594; NR 15 TC 17 Z9 17 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD OCT 27 PY 1994 VL 338 IS 2-3 BP 409 EP 420 DI 10.1016/0370-2693(94)91398-6 PG 12 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PP115 UT WOS:A1994PP11500047 ER PT J AU JOHNSON, TJ ALBINATI, A KOETZLE, TF RICCI, J EISENSTEIN, O HUFFMAN, JC CAULTON, KG AF JOHNSON, TJ ALBINATI, A KOETZLE, TF RICCI, J EISENSTEIN, O HUFFMAN, JC CAULTON, KG TI OSH5(PME(2)PH)(3)(+) - STRUCTURE, REACTIVITY, AND ITS USE AS A CATALYST PRECURSOR FOR OLEFIN HYDROGENATION AND HYDROFORMYLATION SO INORGANIC CHEMISTRY LA English DT Article ID WATER-GAS SHIFT; CARBON-MONOXIDE; HOMOGENEOUS CATALYSIS; OSMIUM POLYHYDRIDES; COMPLEXES; REDUCTION; LIGANDS; HYDRIDE; OSH4(PME2PH)3; ACTIVATION AB OsH(5)L(3)(+) (as its BF4- salt; L = PMe(2)Ph) is characterized by neutron diffraction as a dodecahedral pentahydride. However, the H/H separations are as short as 1.49(4) Angstrom. Crystal data (11 K): a = 53.35(2) Angstrom, b = 24.378(5) Angstrom, 8.422(3) Angstrom with Z = 16 in space group Fdd2. This cation exchanges OsH with D-2 and is converted by CO to OsH(CO)(2)L(3)(+) This cation hydrogenates ethylene (<1 h) at 25 degrees C to generate cis,mer-OsH(C2H4)(2)L(3)(+), which was characterized by variable-temperature P-31, H-1 and C-13 NMR spectroscopy and X-ray diffraction. Crystal data (-155 degrees C): a = 13.134(7) Angstrom, b = 13.300(8) Angstrom, c = 11.011(7) Angstrom, alpha 111.25(2)degrees, beta = 113.15(3)degrees, and gamma = 89.26(3)degrees with Z = 2 in space group P (1) over bar. The orientation of the olefins in this compound is explained using extended Huckel methods, as is the lack of a structural trans influence on Os-C bond lengths and the reversed kinetic trans effect. Studies with Os/D and C2D4 labeling, as well as trapping of transients with CO and with 1,5-cyclooctadiene, serve to define a reaction mechanism for ethylene hydrogenation, and the pentahydride cation also hydrogenates cyclohexene. In spite of the mutual trans stereochemistry of hydride and ethylene in OsH(CO)(C2H4)L(3)(+), CO converts this molecule first to cis,mer-Os(Et)(CO)(2)L(3)(+) and then more slowly to cis,mer-Os[C(O)Et](CO)(2)L(3)(+) A variety of isotopic labeling studies prove that the first of these reactions does not involve preequilibrium dissociation of CO, PMe(2)Ph, or C2H4, nor does it involve bimolecular proton transfer to form the ethyl group. Intramolecular hydrogen migration to bring H cis to C2H4 is consistent with all observations. The carbonyl ligands in OsH(CO)(2)L(3)(+) are susceptible to nucleophilic attack by solvent in water, to effect the water gas shift reaction. In the presence of water and 1-hexene, Reppe hydroformylation (H2O + 2CO + olefin --> aldehyde + CO2) is catalyzed by OsH(CO)(L')L(3)(+) (L' = CO or C2H4) and by Os(Et)(CO)(2)L(3)(+). C1 UNIV PARIS 11,CHIM THEOR LAB,F-91405 ORSAY,FRANCE. INDIANA UNIV,DEPT CHEM,BLOOMINGTON,IN 47405. UNIV PARIS 11,CTR MOLEC STRUCT,F-91405 ORSAY,FRANCE. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. UNIV MILAN,INST CHIM FARMACEUT,I-20131 MILAN,ITALY. RI Eisenstein, Odile/I-1704-2016; Albinati, Alberto/I-1262-2015 OI Eisenstein, Odile/0000-0001-5056-0311; Albinati, Alberto/0000-0002-8779-3327 NR 48 TC 66 Z9 66 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD OCT 26 PY 1994 VL 33 IS 22 BP 4966 EP 4976 DI 10.1021/ic00100a021 PG 11 WC Chemistry, Inorganic & Nuclear SC Chemistry GA PP291 UT WOS:A1994PP29100021 ER PT J AU GEISER, U WANG, HH SCHLUETER, JA WILLIAMS, JM SMART, JL COOPER, AC KUMAR, SK CALECA, M DUDEK, JD CARLSON, KD REN, J WHANGBO, MH SCHIRBER, JE BAYLESS, WR AF GEISER, U WANG, HH SCHLUETER, JA WILLIAMS, JM SMART, JL COOPER, AC KUMAR, SK CALECA, M DUDEK, JD CARLSON, KD REN, J WHANGBO, MH SCHIRBER, JE BAYLESS, WR TI SYNTHESIS, STRUCTURE, AND PROPERTIES OF THE ORGANIC CONDUCTOR (BEDT-TTF)(2)BR2SECN SO INORGANIC CHEMISTRY LA English DT Article ID BAND ELECTRONIC-STRUCTURE; AMBIENT-PRESSURE; CRYSTAL-STRUCTURES; BEDT-TTF; SUPERCONDUCTIVITY; 10-K AB A new salt of the electron-donor molecule BEDT-TTF [bis(ethylenedithio)tetrathiafulvalene, or ET] with the unusual ''T''-shaped anion Br2SeCN- was synthesized. Its crystal structure (space group P1, Z = 1; a = 5.9304(6) Angstrom, b = 8.8042(9) Angstrom, c = 16.509(2) Angstrom, alpha = 95.723(8)degrees, beta = 98.767(8)degrees, gamma = 92.192(8)degrees, V = 846.4(2)Angstrom(3) at 298 K; a = 5.8131(12) Angstrom, b = 8.666(2) Angstrom, c = 16.626(4) Angstrom, alpha = 93.75(2)degrees, beta = 100.62(2)degrees, gamma = 89.75(2)degrees, V = 821.4(3)Angstrom(3) at 122 K) contains layers of ET molecules interspersed with anion layers. A crystallographic phase transition at similar to 150 K is observed, accompanied by a discontinuity in unit cell angles. The band electronic structure calculation suggests the possibility of one-dimensional conduction, but electron localization renders the system semiconducting over the entire temperature range studied, Inductive techniques showed no sign of superconductivity at temperatures above 1.2 K and pressures below 5 kbar. C1 N CAROLINA STATE UNIV,DEPT CHEM,RALEIGH,NC 27650. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP GEISER, U (reprint author), ARGONNE NATL LAB,DIV CHEM & MAT SCI,ARGONNE,IL 60439, USA. NR 24 TC 11 Z9 11 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD OCT 26 PY 1994 VL 33 IS 22 BP 5101 EP 5107 DI 10.1021/ic00100a040 PG 7 WC Chemistry, Inorganic & Nuclear SC Chemistry GA PP291 UT WOS:A1994PP29100040 ER PT J AU WRIGHT, SJ AF WRIGHT, SJ TI AN INFEASIBLE-INTERIOR-POINT ALGORITHM FOR LINEAR COMPLEMENTARITY-PROBLEMS SO MATHEMATICAL PROGRAMMING LA English DT Article DE INFEASIBLE-INTERIOR-POINT METHODS; LINEAR COMPLEMENTARITY PROBLEMS; Q-SUBQUADRATIC CONVERGENCE AB We modify the algorithm of Zhang to obtain an O(n2L) infeasible-interior-point algorithm for monotone linear complementarity problems that has an asymptotic Q-subquadratic convergence rate. The algorithm requires the solution of at most two linear systems with the same coefficient matrix at each iteration. RP WRIGHT, SJ (reprint author), ARGONNE NATL LAB,DIV MATH & COMP SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 12 TC 51 Z9 52 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0025-5610 J9 MATH PROGRAM JI Math. Program. PD OCT 26 PY 1994 VL 67 IS 1 BP 29 EP 51 DI 10.1007/BF01582211 PG 23 WC Computer Science, Software Engineering; Operations Research & Management Science; Mathematics, Applied SC Computer Science; Operations Research & Management Science; Mathematics GA PQ699 UT WOS:A1994PQ69900002 ER PT J AU PENNINGS, S MEERSSEMAN, G BRADBURY, EM AF PENNINGS, S MEERSSEMAN, G BRADBURY, EM TI LINKER HISTONES H1 AND H5 PREVENT THE MOBILITY OF POSITIONED NUCLEOSOMES SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID HIGHER-ORDER STRUCTURE; CHROMATIN STRUCTURE; ACTIVE CHROMATIN; IONIC-STRENGTH; DNA FRAGMENTS; TRANSCRIPTION; BINDING; GENE; SUPERSTRUCTURES; RECONSTITUTION AB We have previously identified a generally occurring short-range mobility of nucleosome cores on DNA in relatively low ionic strength conditions. Here we report that this mobility of histone octamers positioned on constructs of 5S rDNA is suppressed by the binding of histone H1 or H5 to the nucleosome. Histone H5 is the more potent inhibitor of nucleosome mobility, in accordance with its higher affinity for chromatin, We propose that this reversible restraint on chromatin dynamics may play a role in local regulation of processes that require access to the DNA. C1 UNIV CALIF DAVIS,SCH MED,DEPT BIOL CHEM,DAVIS,CA 95616. LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. FU NIGMS NIH HHS [GM26901] NR 42 TC 142 Z9 142 U1 0 U2 2 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD OCT 25 PY 1994 VL 91 IS 22 BP 10275 EP 10279 DI 10.1073/pnas.91.22.10275 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PP698 UT WOS:A1994PP69800008 PM 7937940 ER PT J AU SZABO, A LANGER, T SCHRODER, H FLANAGAN, J BUKAU, B HARTL, FU AF SZABO, A LANGER, T SCHRODER, H FLANAGAN, J BUKAU, B HARTL, FU TI THE ATP HYDROLYSIS-DEPENDENT REACTION CYCLE OF THE ESCHERICHIA-COLI HSP70 SYSTEM - DNAK, DNAJ, AND GRPE SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID HEAT-SHOCK PROTEINS; BINDING-SPECIFICITY; CHAPERONE; REPLICATION; COMPLEX; DISSOCIATION; PURIFICATION; HOMOLOG; ORIGIN; REPA AB Molecular chaperones of the Hsp70 class bind unfolded polypeptide chains and are thought to be involved in the cellular folding pathway of many proteins. DnaK, the Hsp70 protein of Escherichia coli, is regulated by the chaperone protein DnaJ and the cofactor GrpE. To gain a biologically relevant understanding of the mechanism of Hsp70 action, we have analyzed a model reaction in which DnaK, DnaJ, and GrpE mediate the folding of denatured firefly luciferase. The binding and release of substrate protein for folding involves the following ATP hydrolysis-dependent cycle: (i) unfolded luciferase binds initially to DnaJ; (ii) upon interaction with luciferase-DnaJ, DnaK hydrolyzes its bound ATP, resulting in the formation of a stable luciferase-DnaK-DnaJ complex; (iii) GrpE releases ADP from DnaK; and (iv) ATP binding to DnaK triggers the release of substrate protein, thus completing the reaction cycle. A single cycle of binding and release leads to folding of only a fraction of luciferase molecules. Several rounds of ATP-dependent interaction with DnaK and DnaJ are required for fully efficient folding. C1 MEM SLOAN KETTERING CANC CTR,HOWARD HUGHES MED INST,NEW YORK,NY 10021. MEM SLOAN KETTERING CANC CTR,CELLULAR BIOCHEM & BIOPHYS PROGRAM,NEW YORK,NY 10021. UNIV HEIDELBERG,ZENTRUM MOLEK BIOL,D-69120 HEIDELBERG,GERMANY. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. OI Langer, Thomas/0000-0003-1250-1462 FU NIGMS NIH HHS [GM48742] NR 34 TC 388 Z9 392 U1 0 U2 17 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD OCT 25 PY 1994 VL 91 IS 22 BP 10345 EP 10349 DI 10.1073/pnas.91.22.10345 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PP698 UT WOS:A1994PP69800022 PM 7937953 ER PT J AU MCCLUSKEY, MD HALLER, EE WALKER, J JOHNSON, NM AF MCCLUSKEY, MD HALLER, EE WALKER, J JOHNSON, NM TI SPECTROSCOPY OF HYDROGEN/RELATED COMPLEXES IN GAP-ZN SO APPLIED PHYSICS LETTERS LA English DT Article ID PASSIVATION; GAAS; NEUTRALIZATION; IMPURITIES; ACCEPTORS; DEFECTS; LEVEL AB Using infrared spectroscopy, local vibrational modes in GaP:Zn exposed to a remote hydrogen or deuterium plasma were observed. The modes at 2379.0 and 1729.4 cm(-1) are assigned to hydrogen-phosphorus and deuterium-phosphorus bond-stretching modes of complexes adjacent to the zinc acceptors. The isotopic ratio r=nu(H)/nu(D) = 1.3756 is very close to that of the zinc-hydrogen complex in InP (r=1.3744), which suggests that they have the same structure. (C) 1994 American Institute of Physics. C1 XEROX CORP, PALO ALTO RES CTR, PALO ALTO, CA 94304 USA. RP UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RI Schaff, William/B-5839-2009 NR 20 TC 11 Z9 11 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 OCT 24 PY 1994 VL 65 IS 17 BP 2191 EP 2192 DI 10.1063/1.112758 PG 2 WC Physics, Applied SC Physics GA PN176 UT WOS:A1994PN17600025 ER PT J AU PAN, DF GATLEY, SJ DEWEY, SL CHEN, RY ALEXOFF, DA DING, YS FOWLER, JS AF PAN, DF GATLEY, SJ DEWEY, SL CHEN, RY ALEXOFF, DA DING, YS FOWLER, JS TI BINDING OF BROMINE-SUBSTITUTED ANALOGS OF METHYLPHENIDATE TO MONOAMINE TRANSPORTERS SO EUROPEAN JOURNAL OF PHARMACOLOGY LA English DT Article DE METHYLPHENIDATE; DL-THREO-METHYLPHENIDATE; DOPAMINE TRANSPORTER; NOREPINEPHRINE TRANSPORTER; MICRODIALYSIS; LOCOMOTOR ACTIVITY ID DL-THREO-METHYLPHENIDATE; UPTAKE SITES; DOPAMINE; BRAIN; INHIBITION; STRIATUM; PHARMACOKINETICS; NOREPINEPHRINE; MICRODIALYSIS; QUANTITATION AB We synthesized the o-, m- and p-bromo derivatives of dl-threo-methylphenidate from the corresponding bromophenylacetonitriles by modification of the literature synthesis of methylphenidate (Panizzon, Helv. Chim. Acta 1944, 27, 1748). In in vitro binding assays all three dl-threo bromo compounds had higher affinities than methylphenidate for dopamine transporter sites labeled with [H-3]2 beta-carbomethoxy-3 beta-(4-fluorophenyl)tropane ([H-3]WIN 35,428; IC50 = 13, 4, 20 and 82 nM for o-, m-, and p-bromo compounds, and unsubstituted methylphenidate, respectively). They also bound more strongly than methylphenidate to norepinephrine reuptake sites labeled with [H-3]nisoxetine (IC50 = 32, 20, 31 and 440 nM, respectively), but were weak ligands (IC50 greater than or equal to 1 mu M) at the serotonin transporter labeled with [H-3]paroxetine. In addition, the bromine substituted derivatives demonstrated similar activity to methylphenidate in vivo in rodents in terms of inhibition of heart uptake of [H-3](-)-norepinephrine, elevation of striatal extracellular dopamine, and stimulation of locomotor activity. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 26 TC 45 Z9 45 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0014-2999 J9 EUR J PHARMACOL JI Eur. J. Pharmacol. PD OCT 24 PY 1994 VL 264 IS 2 BP 177 EP 182 DI 10.1016/0014-2999(94)00460-9 PG 6 WC Pharmacology & Pharmacy SC Pharmacology & Pharmacy GA PN917 UT WOS:A1994PN91700009 PM 7851480 ER PT J AU QIU, SY WANG, CZ HO, KM CHAN, CT AF QIU, SY WANG, CZ HO, KM CHAN, CT TI TIGHT-BINDING MOLECULAR-DYNAMICS WITH LINEAR SYSTEM-SIZE SCALING SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID DENSITY-MATRIX; MODEL; SIMULATION; SURFACES; CARBON AB A tight-binding molecular dynamics (TBMD) scheme with linear system-size scaling is implemented by incorporating the density-matrix electronic-structure method into tight-binding molecular dynamics. We demonstrate that this scheme, compared to the TBMD with standard diagonalization methods, can work more efficiently for systems larger than a few hundred atoms. We present our testing results on crystalline, amorphous and liquid carbon systems in order to establish the general applicability of the scheme to systems under various physical conditions. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP QIU, SY (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 19 TC 42 Z9 42 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD OCT 24 PY 1994 VL 6 IS 43 BP 9153 EP 9172 DI 10.1088/0953-8984/6/43/015 PG 20 WC Physics, Condensed Matter SC Physics GA PQ122 UT WOS:A1994PQ12200015 ER PT J AU ABE, F ALBROW, MG AMIDEI, D ANTOS, J ANWAYWIESE, C APOLLINARI, G ARETI, H ATAC, M AUCHINCLOSS, P AZFAR, F AZZI, P BACCHETTA, N BADGETT, W BAILEY, MW BAO, J DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BARTALINI, P BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BENTON, D BERETVAS, A BERGE, JP BERTOLUCCI, S BHATTI, A BIERY, K BINKLEY, M BIRD, F BISELLO, D BLAIR, RE BLOCKER, C BODEK, A BOKHARI, W BOLOGNESI, V BORTOLETTO, D BOSWELL, C BOULOS, T BRANDENBURG, G BUCKLEYGEER, E BUDD, HS BURKETT, K BUSETTO, G BYONWAGNER, A BYRUM, KL CAMMERATA, J CAMPAGNARI, C CAMPBELL, M CANER, A CARITHERS, W CARLSMITH, D CASTRO, A CEN, Y CERVELLI, F CHAPMAN, J CHENG, MT CHIARELLI, G CHIKAMATSU, T CIHANGIR, S CLARK, AG COBAL, M CONTRERAS, M CONWAY, J COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DANIELS, T DEJONGH, F DELCHAMPS, S DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DENINNO, M DERWENT, PF DEVLIN, T DICKSON, M DONATI, S DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENGELS, E ENO, S ERREDE, D ERREDE, S FAN, Q FARHAT, B FIORI, I FLAUGHER, B FOSTER, GW FRANKLIN, M FRAUTSCHI, M FREEMAN, J FRIEDMAN, J FRISCH, H FRY, A FUESS, TA FUKUI, Y FUNAKI, S GAGLIARDI, G GALEOTTI, S GALLINARO, M GARFINKEL, AF GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GLENZINSKI, D GOLD, M GONZALEZ, J GORDON, A GOSHAW, AT GOULIANOS, K GRASSMANN, H GREWAL, A GRIECO, G GROER, L GROSSOPILCHER, C HABER, C HAHN, SR HAMILTON, R HANDLER, R HANS, RM HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HEINRICH, J CRONINHENNESSY, D HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUFFMAN, BT HUGHES, R HURST, P HUSTON, J HUTH, J HYLEN, J INCAGLI, M INCANDELA, J ISO, H JENSEN, H JESSOP, CP JOSHI, U KADEL, RW KAJFASZ, E KAMON, T KANEKO, T KARDELIS, DA KASHA, H KATO, Y KEEBLE, L KENNEDY, RD KEPHART, R KESTEN, P KESTENBAUM, D KEUP, RM KEUTELIAN, H KEYVAN, F KIM, DH KIM, HS KIM, SB KIM, SH KIM, YK KIRSCH, L KOEHN, P KONDO, K KONIGSBERG, J KOPP, S KORDAS, K KOSKA, W KOVACS, E KOWALD, W KRASBERG, M KROLL, J KRUSE, M KUHLMANN, SE KUNS, E LAASANEN, AT LABANCA, N LAMMEL, S LAMOUREUX, JI LECOMPTE, T LEONE, S LEWIS, JD LIMON, P LINDGREN, M LISS, TM LOCKYER, N LOOMIS, C LONG, O LORETI, M LOW, EH LU, J LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MAGHAKIAN, A MAKSIMOVIC, P MANGANO, M MANSOUR, J MARIOTTI, M MARRINER, JP MARTIN, A MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MELESE, P MENZIONE, A MESCHI, E MICHAIL, G MIKAMO, S MILLER, M MILLER, R MIMASHI, T MISCETTI, S MISHINA, M MITSUSHIO, H MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T MUSGRAVE, P NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NODULMAN, L OGAWA, S OH, SH OHL, KE OISHI, R OKUSAWA, T PAGLIARONE, C PAOLETTI, R PAPADIMITRIOU, V PARK, S PATRICK, J PAULETTA, G PAULINI, M PESCARA, L PETERS, MD PHILLIPS, TJ PIACENTINO, G PILLAI, M PLUNKETT, R PONDROM, L PRODUIT, N PROUDFOOT, J PTOHOS, F PUNZI, G RAGAN, K RIMONDI, F RISTORI, L ROACHBELLINO, M ROBERTSON, WJ RODRIGO, T ROMANO, J ROSENSON, L SAKUMOTO, WK SALTZBERG, D SANSONI, A SCARPINE, V SCHINDLER, A SCHLABACH, P SCHMIDT, EE SCHMIDT, MP SCHNEIDER, O SCIACCA, GF SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SGOLACCHIA, A SHAPIRO, M SHAW, NM SHEN, Q SHEPARD, PF SHIMOJIMA, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SINGH, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPALDING, J SPIEGEL, L SPHICAS, P SPIES, A STANCO, L STEELE, J STEFANINI, A STRAHL, K STRAIT, J STUART, D SULLIVAN, G SUMOROK, K SWARTZ, RL TAKAHASHI, T TAKIKAWA, K TARTARELLI, F TAYLOR, W TERAMOTO, Y TETHER, S THERIOT, D THOMAS, J THOMAS, TL THUN, R TIMKO, M TIPTON, P TITOV, A TKACZYK, S TOLLEFSON, K TOLLESTRUP, A TONNISON, J DETROCONIZ, JF TSENG, J TURCOTTE, M TURINI, N UEMURA, N UKEGAWA, F UNAL, G VANDENBRINK, S VEJCIK, S VIDAL, R VONDRACEK, M WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WANG, G WANG, J WANG, MJ WANG, QF WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WICKLUND, AB WICKLUND, E WILLKINSON, R WILLIAMS, HH WILSON, P WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YAO, W YASUOKA, K YE, Y YEH, GP YEH, P YIN, M YOH, J YOSHIDA, T YOVANOVITCH, D YU, I YUN, JC ZANETTI, A ZETTI, F ZHANG, L ZHANG, S ZHANG, W ZUCCHELLI, S AF ABE, F ALBROW, MG AMIDEI, D ANTOS, J ANWAYWIESE, C APOLLINARI, G ARETI, H ATAC, M AUCHINCLOSS, P AZFAR, F AZZI, P BACCHETTA, N BADGETT, W BAILEY, MW BAO, J DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BARTALINI, P BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BENTON, D BERETVAS, A BERGE, JP BERTOLUCCI, S BHATTI, A BIERY, K BINKLEY, M BIRD, F BISELLO, D BLAIR, RE BLOCKER, C BODEK, A BOKHARI, W BOLOGNESI, V BORTOLETTO, D BOSWELL, C BOULOS, T BRANDENBURG, G BUCKLEYGEER, E BUDD, HS BURKETT, K BUSETTO, G BYONWAGNER, A BYRUM, KL CAMMERATA, J CAMPAGNARI, C CAMPBELL, M CANER, A CARITHERS, W CARLSMITH, D CASTRO, A CEN, Y CERVELLI, F CHAPMAN, J CHENG, MT CHIARELLI, G CHIKAMATSU, T CIHANGIR, S CLARK, AG COBAL, M CONTRERAS, M CONWAY, J COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DANIELS, T DEJONGH, F DELCHAMPS, S DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DENINNO, M DERWENT, PF DEVLIN, T DICKSON, M DONATI, S DRUCKER, RB DUNN, A EINSWEILER, K ELIAS, JE ELY, R ENGELS, E ENO, S ERREDE, D ERREDE, S FAN, Q FARHAT, B FIORI, I FLAUGHER, B FOSTER, GW FRANKLIN, M FRAUTSCHI, M FREEMAN, J FRIEDMAN, J FRISCH, H FRY, A FUESS, TA FUKUI, Y FUNAKI, S GAGLIARDI, G GALEOTTI, S GALLINARO, M GARFINKEL, AF GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GLENZINSKI, D GOLD, M GONZALEZ, J GORDON, A GOSHAW, AT GOULIANOS, K GRASSMANN, H GREWAL, A GRIECO, G GROER, L GROSSOPILCHER, C HABER, C HAHN, SR HAMILTON, R HANDLER, R HANS, RM HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HEINRICH, J CRONINHENNESSY, D HOLLEBEEK, R HOLLOWAY, L HOLSCHER, A HONG, S HOUK, G HU, P HUFFMAN, BT HUGHES, R HURST, P HUSTON, J HUTH, J HYLEN, J INCAGLI, M INCANDELA, J ISO, H JENSEN, H JESSOP, CP JOSHI, U KADEL, RW KAJFASZ, E KAMON, T KANEKO, T KARDELIS, DA KASHA, H KATO, Y KEEBLE, L KENNEDY, RD KEPHART, R KESTEN, P KESTENBAUM, D KEUP, RM KEUTELIAN, H KEYVAN, F KIM, DH KIM, HS KIM, SB KIM, SH KIM, YK KIRSCH, L KOEHN, P KONDO, K KONIGSBERG, J KOPP, S KORDAS, K KOSKA, W KOVACS, E KOWALD, W KRASBERG, M KROLL, J KRUSE, M KUHLMANN, SE KUNS, E LAASANEN, AT LABANCA, N LAMMEL, S LAMOUREUX, JI LECOMPTE, T LEONE, S LEWIS, JD LIMON, P LINDGREN, M LISS, TM LOCKYER, N LOOMIS, C LONG, O LORETI, M LOW, EH LU, J LUCCHESI, D LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MAGHAKIAN, A MAKSIMOVIC, P MANGANO, M MANSOUR, J MARIOTTI, M MARRINER, JP MARTIN, A MATTHEWS, JAJ MATTINGLY, R MCINTYRE, P MELESE, P MENZIONE, A MESCHI, E MICHAIL, G MIKAMO, S MILLER, M MILLER, R MIMASHI, T MISCETTI, S MISHINA, M MITSUSHIO, H MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T MUSGRAVE, P NAKAE, LF NAKANO, I NELSON, C NEUBERGER, D NEWMANHOLMES, C NODULMAN, L OGAWA, S OH, SH OHL, KE OISHI, R OKUSAWA, T PAGLIARONE, C PAOLETTI, R PAPADIMITRIOU, V PARK, S PATRICK, J PAULETTA, G PAULINI, M PESCARA, L PETERS, MD PHILLIPS, TJ PIACENTINO, G PILLAI, M PLUNKETT, R PONDROM, L PRODUIT, N PROUDFOOT, J PTOHOS, F PUNZI, G RAGAN, K RIMONDI, F RISTORI, L ROACHBELLINO, M ROBERTSON, WJ RODRIGO, T ROMANO, J ROSENSON, L SAKUMOTO, WK SALTZBERG, D SANSONI, A SCARPINE, V SCHINDLER, A SCHLABACH, P SCHMIDT, EE SCHMIDT, MP SCHNEIDER, O SCIACCA, GF SCRIBANO, A SEGLER, S SEIDEL, S SEIYA, Y SGANOS, G SGOLACCHIA, A SHAPIRO, M SHAW, NM SHEN, Q SHEPARD, PF SHIMOJIMA, M SHOCHET, M SIEGRIST, J SILL, A SINERVO, P SINGH, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPALDING, J SPIEGEL, L SPHICAS, P SPIES, A STANCO, L STEELE, J STEFANINI, A STRAHL, K STRAIT, J STUART, D SULLIVAN, G SUMOROK, K SWARTZ, RL TAKAHASHI, T TAKIKAWA, K TARTARELLI, F TAYLOR, W TERAMOTO, Y TETHER, S THERIOT, D THOMAS, J THOMAS, TL THUN, R TIMKO, M TIPTON, P TITOV, A TKACZYK, S TOLLEFSON, K TOLLESTRUP, A TONNISON, J DETROCONIZ, JF TSENG, J TURCOTTE, M TURINI, N UEMURA, N UKEGAWA, F UNAL, G VANDENBRINK, S VEJCIK, S VIDAL, R VONDRACEK, M WAGNER, RG WAGNER, RL WAINER, N WALKER, RC WANG, G WANG, J WANG, MJ WANG, QF WARBURTON, A WATTS, G WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WICKLUND, AB WICKLUND, E WILLKINSON, R WILLIAMS, HH WILSON, P WINER, BL WOLINSKI, J WU, DY WU, X WYSS, J YAGIL, A YAO, W YASUOKA, K YE, Y YEH, GP YEH, P YIN, M YOH, J YOSHIDA, T YOVANOVITCH, D YU, I YUN, JC ZANETTI, A ZETTI, F ZHANG, L ZHANG, S ZHANG, W ZUCCHELLI, S TI W-BOSON PLUS JET ANGULAR-DISTRIBUTION IN P(P)OVER-BAR COLLISIONS AT ROOT-S=1.8-TEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID = 1.8 TEV; PBARP COLLISIONS; HADRON COLLIDERS; MONTE-CARLO; 1.8-TEV; EVENTS; MASS AB The W + jet angular distribution is measured using W --> ev events recorded with the Collider Detector at Fermilab (CDF) during the 1988-89 and 1992-93 Tevatron runs. The data agree well with both a leading order and a next-to-leading order theoretical prediction. The shape of the angular distribution is similar to that observed in photon + jet data and significantly different from that observed in dijet data. C1 ARGONNE NATL LAB, ARGONNE, IL 60439 USA. UNIV BOLOGNA, IST NAZL FIS NUCL, I-40126 BOLOGNA, ITALY. BRANDEIS UNIV, WALTHAM, MA 02254 USA. UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA. UNIV CHICAGO, CHICAGO, IL 60637 USA. DUKE UNIV, DURHAM, NC 27708 USA. FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. IST NAZL FIS NUCL, LAB NAZL FRASCATI, I-00044 FRASCATI, ITALY. HARVARD UNIV, CAMBRIDGE, MA 02138 USA. UNIV ILLINOIS, URBANA, IL 61801 USA. MCGILL UNIV, INST PARTICLE PHYS, MONTREAL H3A 2T8, PQ, CANADA. UNIV TORONTO, TORONTO M5S 1A7, ON, CANADA. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. MIT, CAMBRIDGE, MA 02139 USA. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. MICHIGAN STATE UNIV, E LANSING, MI 48824 USA. UNIV NEW MEXICO, ALBUQUERQUE, NM 87131 USA. OSAKA CITY UNIV, OSAKA 588, JAPAN. UNIV PADUA, INST NAZL FIS NUCL, I-35131 PADUA, ITALY. UNIV PENN, PHILADELPHIA, PA 19104 USA. UNIV PITTSBURGH, PITTSBURGH, PA 15260 USA. UNIV PISA, IST NAZL FIS NUCL, I-56100 PISA, ITALY. SCUOLA NORMALE SUPER PISA, I-56100 PISA, ITALY. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. UNIV ROCHESTER, ROCHESTER, NY 14627 USA. ROCKEFELLER UNIV, NEW YORK, NY 10021 USA. RUTGERS STATE UNIV, PISCATAWAY, NJ 08854 USA. ACAD SINICA, TAIPEI 11529, TAIWAN. SUPERCONDUCTING SUPER COLLIDER LAB, DALLAS, TX 75237 USA. TEXAS A&M UNIV, COLLEGE STN, TX 77843 USA. UNIV TSUKUBA, TSUKUBA, IBARAKI 305, JAPAN. TUFTS UNIV, MEDFORD, MA 02155 USA. UNIV WISCONSIN, MADISON, WI 53706 USA. YALE UNIV, NEW HAVEN, CT 06511 USA. RP ABE, F (reprint author), NATL LAB HIGH ENERGY PHYS, TSUKUBA, IBARAKI 305, JAPAN. RI Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Warburton, Andreas/N-8028-2013; Kim, Soo-Bong/B-7061-2014; Paulini, Manfred/N-7794-2014 OI Chiarelli, Giorgio/0000-0001-9851-4816; Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Warburton, Andreas/0000-0002-2298-7315; Paulini, Manfred/0000-0002-6714-5787 NR 17 TC 6 Z9 6 U1 0 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 OCT 24 PY 1994 VL 73 IS 17 BP 2296 EP 2300 DI 10.1103/PhysRevLett.73.2296 PG 5 WC Physics, Multidisciplinary SC Physics GA PN072 UT WOS:A1994PN07200005 ER PT J AU CABLE, MD HATCHETT, SP CAIRD, JA KILKENNY, JD KORNBLUM, HN LANE, SM LAUMANN, C LERCHE, RA MURPHY, TJ MURRAY, J NELSON, MB PHILLION, DW POWELL, H RESS, DB AF CABLE, MD HATCHETT, SP CAIRD, JA KILKENNY, JD KORNBLUM, HN LANE, SM LAUMANN, C LERCHE, RA MURPHY, TJ MURRAY, J NELSON, MB PHILLION, DW POWELL, H RESS, DB TI INDIRECTLY DRIVEN, HIGH CONVERGENCE INERTIAL CONFINEMENT FUSION IMPLOSIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID COMPRESSION; TARGETS AB A series of high convergence, indirectly driven implosions has been done with the Nova Laser Fusion facility. These implosions were well characterized by a variety of measurements; computer models are in good agreement. The imploded fuel areal density was measured using a technique based on secondary neutron spectroscopy. At capsule convergences of 24:1, comparable to what is required for the hot spot of ignition scale capsules, these capsules achieved fuel densities of 19 g/cm(3). Independent measurements of density, burn duration, and ion temperature gave nT theta = 1.7 +/- 0.9 X 10(14) keV s/cm(3). RP CABLE, MD (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94551, USA. RI Murphy, Thomas/F-3101-2014 OI Murphy, Thomas/0000-0002-6137-9873 NR 21 TC 73 Z9 76 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 24 PY 1994 VL 73 IS 17 BP 2316 EP 2319 DI 10.1103/PhysRevLett.73.2316 PG 4 WC Physics, Multidisciplinary SC Physics GA PN072 UT WOS:A1994PN07200010 ER PT J AU KAUFFMAN, RL SUTER, LJ DARROW, CB KILKENNY, JD KORNBLUM, HN MONTGOMERY, DS PHILLION, DW ROSEN, MD THEISSEN, AR WALLACE, RJ ZE, F AF KAUFFMAN, RL SUTER, LJ DARROW, CB KILKENNY, JD KORNBLUM, HN MONTGOMERY, DS PHILLION, DW ROSEN, MD THEISSEN, AR WALLACE, RJ ZE, F TI HIGH-TEMPERATURES IN INERTIAL CONFINEMENT FUSION RADIATION CAVITIES HEATED WITH 0.35-MU-M LIGHT SO PHYSICAL REVIEW LETTERS LA English DT Article ID X-RAY CONFINEMENT; HIGH-DENSITIES; LASER-LIGHT; NOVA; COMPRESSION AB We have demonstrated efficient coupling of 0.35 mu m laser light for radiation production in inertial confinement fusion (ICF) cavity targets. Temperatures of 270 eV are measured in cavities used for implosions and 300 eV in smaller cavities, significantly extending the temperature range attained in the laboratory to those required for high-gain indirect drive ICF. High-contrast, shaped drive pulses required for implosion experiments have also been demonstrated for the first time. Low levels of scattered light and fast electrons are observed, indicating that plasma instability production is not significant. RP KAUFFMAN, RL (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94551, USA. NR 23 TC 155 Z9 158 U1 2 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 OCT 24 PY 1994 VL 73 IS 17 BP 2320 EP 2323 DI 10.1103/PhysRevLett.73.2320 PG 4 WC Physics, Multidisciplinary SC Physics GA PN072 UT WOS:A1994PN07200011 ER PT J AU DITTRICH, TR HAMMEL, BA KEANE, CJ MCEACHERN, R TURNER, RE HAAN, SW SUTER, LJ AF DITTRICH, TR HAMMEL, BA KEANE, CJ MCEACHERN, R TURNER, RE HAAN, SW SUTER, LJ TI DIAGNOSIS OF PUSHER-FUEL MIX IN INDIRECTLY DRIVEN NOVA IMPLOSIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID X-RAY SPECTROSCOPY; HYDRODYNAMIC INSTABILITY; SHELL SPECTROSCOPY; LASER; PLASMAS; CAPSULES; MODEL AB We report measurements of controlled implosion performance degradation arising from the Rayleigh-Taylor instability in inertial confinement fusion capsules. Using plastic capsules driven indirectly by the Nova laser, we studied the variation in implosion performance as a function of outer surface perturbation. Variations in both capsule x-ray and neutron emission are seen which are consistent with a model which describes mixing pusher material into fuel material. The model combines representative capsule surface characterization, implosion stability, and perturbation growth saturation. RP DITTRICH, TR (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 19 TC 62 Z9 62 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 24 PY 1994 VL 73 IS 17 BP 2324 EP 2327 DI 10.1103/PhysRevLett.73.2324 PG 4 WC Physics, Multidisciplinary SC Physics GA PN072 UT WOS:A1994PN07200012 ER PT J AU SUTER, LJ HAUER, AA POWERS, LV RESS, DB DELAMETER, N HSING, WW LANDEN, OL THIESSEN, AR TURNER, RE AF SUTER, LJ HAUER, AA POWERS, LV RESS, DB DELAMETER, N HSING, WW LANDEN, OL THIESSEN, AR TURNER, RE TI MODELING AND INTERPRETATION OF NOVAS SYMMETRY SCALING DATA-BASE SO PHYSICAL REVIEW LETTERS LA English DT Article AB Our 2D LASNEX simulations of Nova's nine symmetry scaling data bases reproduce the fundamental features seen in the experiments. In particular, we predict how we must change Nova's beam pointing in order to achieve best symmetry with various pulse shapes. This need to change pointing with different pulse shapes is the result of a bulk-plasma-induced migration of the laser deposition/x-ray production region. We have observed and modeled this migration. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SUTER, LJ (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 12 TC 88 Z9 91 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 OCT 24 PY 1994 VL 73 IS 17 BP 2328 EP 2331 DI 10.1103/PhysRevLett.73.2328 PG 4 WC Physics, Multidisciplinary SC Physics GA PN072 UT WOS:A1994PN07200013 ER PT J AU FISCHER, AJ KIM, DS HAYS, J SHAN, W SONG, JJ EASON, DB REN, J SCHETZINA, JF LUO, H FURDYNA, JK ZHU, ZQ YAO, T KLEM, JF SCHAFER, W AF FISCHER, AJ KIM, DS HAYS, J SHAN, W SONG, JJ EASON, DB REN, J SCHETZINA, JF LUO, H FURDYNA, JK ZHU, ZQ YAO, T KLEM, JF SCHAFER, W TI FEMTOSECOND COHERENT SPECTROSCOPY OF BULK ZNSE AND ZNCDSE/ZNSE QUANTUM-WELLS SO PHYSICAL REVIEW LETTERS LA English DT Article ID PHOTON-ECHO; EXCITONS; GAAS; RELAXATION; MAGNETOEXCITONS; RESONANCE; LIGHT AB Femtosecond two beam, self-diffraction experiments are performed in ZnSe and ZnCdSe/ZnSe quantum wells. Degenerate wave mixing signals from the third to the thirteenth order are easily visible to the naked eye, implying that nonlinear effects in this system may already be in the nonperturbative regime. Spectrally resolved data indicate that the nonlinearities originate entirely from the excitonic resonance. In addition, the existence of four-wave mixing signals in bulk ZnSe at negative time delay suggests that exciton-exciton interaction plays an important role. Exciton-phonon interaction rates are deduced as a function of temperature in ZnSe and ZnCdSe/ZnSe quantum wells. C1 OKLAHOMA STATE UNIV, DEPT PHYS, STILLWATER, OK 74078 USA. N CAROLINA STATE UNIV, DEPT PHYS, RALEIGH, NC 27695 USA. UNIV NOTRE DAME, DEPT PHYS, NOTRE DAME, IN 46556 USA. HIROSHIMA UNIV, DEPT ELECTR ENGN, HIGASHIHIROSHIMA 724, JAPAN. SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, HOCHSTLEISTUNGSRECHENZENTRUM, W-5170 JULICH, GERMANY. RP FISCHER, AJ (reprint author), OKLAHOMA STATE UNIV, CTR LASER RES, STILLWATER, OK 74078 USA. NR 35 TC 56 Z9 56 U1 0 U2 5 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 24 PY 1994 VL 73 IS 17 BP 2368 EP 2371 DI 10.1103/PhysRevLett.73.2368 PG 4 WC Physics, Multidisciplinary SC Physics GA PN072 UT WOS:A1994PN07200023 ER PT J AU JONES, G FARAHAT, MS GREENFIELD, SR GOSZTOLA, DJ WASIELEWSKI, MR AF JONES, G FARAHAT, MS GREENFIELD, SR GOSZTOLA, DJ WASIELEWSKI, MR TI ULTRAFAST PHOTOINDUCED CHARGE-SHIFT REACTIONS IN ELECTRON DONOR-ACCEPTOR 9-ARYLACRIDINIUM IONS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID SOLVATION DYNAMICS; KINETICS; PHOTOSYNTHESIS; RATES AB Charge-shift species arising from intramolecular electron transfer have been identified for 9-aryl derivatives of the 10-methylacridinium ion through observation of red-shifted fluorescence emission bands and the appearance of radical(ion) transients (CH3CN and CH2Cl2 solvents) using laser flash photolysis. Rates of forward and return charge-shift processes have been determined, the former occurring in the 1 ps time domain with small effects associated with changes in solvent and the electron donor substituent. Rates for return electron transfer were a strong function of the donor oxidation potential and showed acceleration with decreased driving force (inverted behavior). The lifetimes for charge-shift intermediates could be 'tuned' over three orders of magnitude as the result of changes in acridinium structure and solvent. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP JONES, G (reprint author), BOSTON UNIV,DEPT CHEM,590 COMMONWEALTH AVE,BOSTON,MA 02215, USA. RI Gosztola, David/D-9320-2011 OI Gosztola, David/0000-0003-2674-1379 NR 28 TC 41 Z9 41 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD OCT 21 PY 1994 VL 229 IS 1-2 BP 40 EP 46 DI 10.1016/0009-2614(94)00996-1 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PN341 UT WOS:A1994PN34100007 ER PT J AU OH, BH AMES, GFL KIM, SH AF OH, BH AMES, GFL KIM, SH TI STRUCTURAL BASIS FOR MULTIPLE LIGAND SPECIFICITY OF THE PERIPLASMIC LYSINE, ARGININE, ORNITHINE-BINDING PROTEIN SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID SUBSTRATE-SPECIFICITY; ESCHERICHIA-COLI; TRANSPORT-SYSTEMS; ACTIVE-TRANSPORT; MECHANISM; CHEMOTAXIS; BACTERIA; AFFINITY; LEUCINE AB The substrate-binding site of a protein with multiple specificity should satisfy geometric and energetic complementarity for several different substrates. The structural basis of the multiple ligand specificity of the periplasmic lysine-, arginine-, ornithine-binding protein (LAO) was investigated by determining and analyzing the structures of the protein unliganded and liganded with each of the three high-affinity ligands (L-lysine, L-arginine, and L-ornithine) and with one low-affinity ligand (L-histidine). The geometric complementarity is achieved primarily by virtue of the large size of the ligand-binding site which can accommodate the maximum common volume of the four ligands plus three water molecules. The optimization of energetic complementarity is achieved by the relocation of protein-bound water molecules and by the movement of the Asp-11 side chain. The structure of the LAO-histidine complex indicates that the 30-fold reduced affinity of the protein for histidine is primarily due to unavailability of one ionic interaction of the histidine side chain with the protein which is present in the other three complexes. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. RI Oh, Byung-Ha/C-2061-2011 FU NIAID NIH HHS [AI30725]; NIDDK NIH HHS [DK12121, DK43747] NR 29 TC 43 Z9 43 U1 0 U2 2 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD OCT 21 PY 1994 VL 269 IS 42 BP 26323 EP 26330 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA PQ930 UT WOS:A1994PQ93000059 PM 7929349 ER PT J AU SARKER, M GUIOCHON, G AF SARKER, M GUIOCHON, G TI STUDY OF THE PACKING BEHAVIOR OF RADIAL COMPRESSION COLUMNS FOR PREPARATIVE CHROMATOGRAPHY SO JOURNAL OF CHROMATOGRAPHY A LA English DT Article ID PERFORMANCE LIQUID-CHROMATOGRAPHY; OPTIMIZATION; SIMULATIONS; ELUTION; BANDS; PHASE AB The behavior of the packing of radial compression preparative columns (17.5 x 7.5 cm) was studied using C-18 silica IMPAQ as the stationary phase and water-methanol solutions as the mobile phase. The retention volumes of phenol and cresol and the efficiency of their peaks were repeatedly measured on three different columns, over several hundred hours, during which repeated water-methanol gradient runs were conducted. No significant changes in the retention factors and the column efficiency were observed during the testing period. The effects of the mobile phase temperature and of the radial compression pressure on the column efficiency were also studied. The external porosity and the permeability of the packing were found to decrease slowly with increasing compression pressure. Finally, a set of experiments were performed to trigger the formation of channels and to show their possible repair by applying elevated radial compression pressures. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. NR 29 TC 19 Z9 20 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR A JI J. Chromatogr. A PD OCT 21 PY 1994 VL 683 IS 2 BP 293 EP 309 DI 10.1016/0021-9673(94)00503-6 PG 17 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA PP294 UT WOS:A1994PP29400002 ER PT J AU DAVIDS, PS AF DAVIDS, PS TI ANALYTIC STRUCTURE OF THE ONE-DIMENSIONAL RANDOM-BOND ISING-MODEL SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Article ID MATRICES; BEHAVIOR; CHAINS AB The quenched average of the one-dimensional random-bond (+/-J) Ising model in a magnetic field is studied using a technique based on the transformation of a product of random 2 x 2 matrices to an iterated conformal map. This approach allows for the underlying analytic structure of the random matrix product to appear as a natural consequence of the conformal mapping of the extended complex plane. The quenched average of the characteristic exponent (i.e. the free energy) is obtained by averaging over a specified probability distribution of nearest-neighbour coupling. The evaluation of the quenched average of the characteristic exponent is performed within the isoentropic approximation. The isoentropic approximation treats ah bond configurations with the same number of antiferromagnetic domains having the same entropy and enables the enumeration of equivalent configurations. Combinatorial methods can then be used to express the average over all realizations of the random matrix product as a combinatorial sum. The combinatorial sum is evaluated using resummation methods and an explicit expression for the quenched average of the characteristic exponent is thereby obtained for the case of the random-bond Ising model. The explicit expression for the free energy is dependent on constants which are calculated numerically. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RI Davids, Paul/D-1550-2010 NR 16 TC 2 Z9 2 U1 0 U2 4 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 OCT 21 PY 1994 VL 27 IS 20 BP 6703 EP 6717 DI 10.1088/0305-4470/27/20/011 PG 15 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA PN977 UT WOS:A1994PN97700011 ER PT J AU MIASKIEWICZ, K STEUDEL, R AF MIASKIEWICZ, K STEUDEL, R TI STRUCTURES, ENERGIES AND VIBRATIONAL-SPECTRA OF 4 ISOMERS OF HYDROGENDIOXOTHIOSULFATE(IV) ANION (HS2O2-) AND OF THE RELATED ANION CLSO2- - AN AB-INITIO MOLECULAR-ORBITAL STUDY SO JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS LA English DT Article ID SULFUR-DIOXIDE COMPLEX; MICROWAVE-SPECTRUM; ION; ABINITIO; ACID AB The ground-state geometries. energies, atomic charges and vibrational wavenumbers of four isomeric forms of the HS2O2- anion as well as of the related ClSO2- anion have been calculated at the HF/6-311G(**) and HF/6-311++G(**) levels. Electron correlation has been taken into account according to second order Moller-Plesset perturbation theory (MP2). The most stable isomer of HS2O2- is HSSO2- 1 the formation of which from SO2 and HS- is exothermic by ca. 108 kJ mol(-1) (calculated reaction energy). The analogous formation of ClSO2- from SO2 and Cl- is exothermic by 79 kJ mol(-1). Slightly less stable than 1 are HOS(SO- 2 and HS(S)O-2(-) 4 and least stable is the isomer HOSSO3(-) Anions 1-3 are of C-1 symmetry and 4 as well as ClSO2- are of C-s symmetry. The likely intermediates of the reaction between H2S and SO2 in its early stage are discussed. The calculated wavenumbers of the fundamental modes of ClSO2- agree well with experimental data. C1 TECH UNIV BERLIN, INST ANORGAN & ANALYT CHEM, D-10623 BERLIN, GERMANY. PACIFIC NW LAB, DEPT BIOL & CHEM, RICHLAND, WA 99352 USA. NR 38 TC 6 Z9 6 U1 0 U2 0 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND SN 1472-7773 J9 J CHEM SOC DALTON JI J. Chem. Soc.-Dalton Trans. PD OCT 21 PY 1994 IS 20 BP 2919 EP 2923 DI 10.1039/dt9940002919 PG 5 WC Chemistry, Inorganic & Nuclear SC Chemistry GA PP710 UT WOS:A1994PP71000003 ER PT J AU ESSUNGER, P PERELSON, AS AF ESSUNGER, P PERELSON, AS TI MODELING HIV-INFECTION OF CD4(+) T-CELL SUBPOPULATIONS SO JOURNAL OF THEORETICAL BIOLOGY LA English DT Article ID HUMAN-IMMUNODEFICIENCY-VIRUS; PERIPHERAL-BLOOD; SEROPOSITIVE INDIVIDUALS; INSITU HYBRIDIZATION; TYPE-1 INFECTION; CD4+ LYMPHOCYTES; HOMOSEXUAL MEN; IMMUNE-SYSTEM; VIRAL BURDEN; HTLV-III/LAV AB We develop and analyze a set of models for the interaction of HIV with CD4(+) T cells. We consider three major subpopulations of T cells: virgin, activated and memory. In our first model we assume that HIV can infect activated cells but not resting cells. We then generalize the model to take into account recent reports that HIV can enter resting cells but that such entry does not lead to the production of completely reverse transcribed copies of the viral genome pr integration of the DNA copy into the host cell's genome unless cell activation occurs. Our models show that T-cell memory is greatly reduced by HIV infection and that T-cell depletion may be due to the direct killing of peripheral T cells and T-cell precursors in the thymus. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. FU NCRR NIH HHS [RR06555]; NIAID NIH HHS [AI28433] NR 72 TC 94 Z9 97 U1 0 U2 2 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-5193 J9 J THEOR BIOL JI J. Theor. Biol. PD OCT 21 PY 1994 VL 170 IS 4 BP 367 EP 391 DI 10.1006/jtbi.1994.1199 PG 25 WC Biology; Mathematical & Computational Biology SC Life Sciences & Biomedicine - Other Topics; Mathematical & Computational Biology GA PN859 UT WOS:A1994PN85900005 PM 7996863 ER PT J AU RATCLIFF, CD GEISSMAN, JW PERRY, FV CROWE, BM ZEITLER, PK AF RATCLIFF, CD GEISSMAN, JW PERRY, FV CROWE, BM ZEITLER, PK TI PALEOMAGNETIC RECORD OF A GEOMAGNETIC-FIELD REVERSAL FROM LATE MIOCENE MAFIC INTRUSIONS, SOUTHERN NEVADA SO SCIENCE LA English DT Article ID MOUNTAIN; ROCKS; TRANSITION; SEDIMENTS; REMANENCE; GEOMETRY; STATES; PATHS AB Late Miocene (about 8.65 million years ago) mafic intrusions and lava flows along with remagnetized host rocks from Paiute Ridge, southern Nevada, provide a high-quality paleomagnetic record of a geomagnetic field reversal. These rocks yield thermoremanent magnetizations with declinations of 227 degrees to 310 degrees and inclinations of -7 degrees to 49 degrees, defining a reasonably continuous virtual geomagnetic pole path over west-central Pacific longitudes. Conductive cooling estimates for the intrusions suggest that this field transition, and mafic magmatism, lasted only a few hundred years. Because this record comes principally from intrusive rocks, rather than sediments or lavas, it is important in demonstrating the longitudinal confinement of the geomagnetic field during a reversal. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,LAS VEGAS,NV 89109. LEHIGH UNIV,DEPT EARTH & ENVIRONM SCI,BETHLEHEM,PA 18015. RP RATCLIFF, CD (reprint author), UNIV NEW MEXICO,DEPT EARTH & PLANETARY SCI,ALBUQUERQUE,NM 87131, USA. NR 40 TC 5 Z9 5 U1 0 U2 1 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD OCT 21 PY 1994 VL 266 IS 5184 BP 412 EP 416 DI 10.1126/science.266.5184.412 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PN272 UT WOS:A1994PN27200027 PM 17816684 ER PT J AU WANG, Q SCHOENLEIN, RW PETEANU, LA MATHIES, RA SHANK, CV AF WANG, Q SCHOENLEIN, RW PETEANU, LA MATHIES, RA SHANK, CV TI VIBRATIONALLY COHERENT PHOTOCHEMISTRY IN THE FEMTOSECOND PRIMARY EVENT OF VISION SO SCIENCE LA English DT Article ID CIS-TRANS ISOMERIZATION; 1ST STEP; IMPULSIVE EXCITATION; DYNAMICS; BACTERIORHODOPSIN; RHODOPSIN; PHOTOISOMERIZATION; FEMTOCHEMISTRY; ISORHODOPSIN; SPECTROSCOPY AB Femtosecond pump-probe experiments reveal the impulsive production of photoproduct in the primary event in vision. The retinal chromophore of rhodopsin was excited with a 35-femtosecond pulse at 500 nanometers, and transient changes in absorption were measured with 10-femtosecond probe pulses. At probe wavelengths within the photoproduct absorption band, oscillatory features with a period of 550 femtoseconds (60 wavenumbers) were observed whose phase and amplitude demonstrate that they are the result of nonstationary vibrational motion in the ground state of the photoproduct. The observation of coherent vibrational motion of the photoproduct supports the idea that the primary step in vision is a vibrationally coherent process and that the high quantum yield of the cis-->trans isomerization in rhodopsin is a consequence of the extreme speed of the excited-state torsional motion. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP WANG, Q (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Schoenlein, Robert/D-1301-2014 OI Schoenlein, Robert/0000-0002-6066-7566 FU NEI NIH HHS [EY-02051] NR 24 TC 456 Z9 464 U1 10 U2 104 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD OCT 21 PY 1994 VL 266 IS 5184 BP 422 EP 424 DI 10.1126/science.7939680 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PN272 UT WOS:A1994PN27200030 PM 7939680 ER PT J AU MARCHETTI, AA ROSE, L STRAUME, T AF MARCHETTI, AA ROSE, L STRAUME, T TI A SIMPLE AND RELIABLE METHOD TO EXTRACT AND MEASURE IODINE IN SOILS SO ANALYTICA CHIMICA ACTA LA English DT Article DE GAS CHROMATOGRAPHY; IODINE IN SOIL SAMPLES; ENVIRONMENTAL SAMPLES; CHEMICAL EXTRACTION; ACCELERATOR MASS SPECTROMETRY (AMS) ID NEUTRON-ACTIVATION ANALYSIS; I-129; FOODS AB A procedure was developed for the extraction of iodine from soil samples by alkaline ashing. After the extraction, the iodine was measured using gas chromatography. The method was validated using MST Standard Reference Materials: San Joaquin Soil (SRM 2709), Montana Soil (SRM 2711) and Buffalo River Sediment (SRM 2704). The method gave consistently reproducible results that are in good agreement with the noncertified iodine concentrations reported by NIST, which were measured using neutron activation analysis. The method presented here requires relatively low cost equipment and can be performed in most environmental measurement laboratories. Also, since it has been demonstrated to be reliable for soils, it may help in the development of NIST certified soil standards for iodine. RP MARCHETTI, AA (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94551, USA. NR 17 TC 16 Z9 16 U1 0 U2 2 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 OCT 20 PY 1994 VL 296 IS 3 BP 243 EP 247 DI 10.1016/0003-2670(94)80242-4 PG 5 WC Chemistry, Analytical SC Chemistry GA PM140 UT WOS:A1994PM14000003 ER PT J AU HELFAND, DJ BECKER, RH HAWKINS, G WHITE, RL AF HELFAND, DJ BECKER, RH HAWKINS, G WHITE, RL TI THE NATURE OF THE COMPACT X-RAY SOURCE IN THE SUPERNOVA REMNANT G27.4+0.0 SO ASTROPHYSICAL JOURNAL LA English DT Article DE ISM, INDIVIDUAL (G27.4+0.0); RADIATION MECHANISMS, NONTHERMAL; SUPERNOVA REMNANTS; X-RAYS, ISM ID PULSAR; ACCRETION; SPECTRUM AB High-resolution X-ray imaging data obtained with ROSAT is used to constrain the nature of the central compact source in the supernova remnant G27.4 + 0.0. Diffuse emission is seen from throughout the approximately 4' diameter radio shell, while the central source remains unresolved at approximately 3''. We combine archival data from the Einstein HRI, IPC, and MPC with the ROSAT HRI data to define the X-ray spectra of the diffuse and point-like emission. The bulk of the shell radiation is consistent with that of a approximately 10(7) K plasma, although a higher temperature component is also suggested by the data; coupled with the remnant's size and distance, we derive an age of between 500 and 2500 yr. The point source has a substantially harder spectrum, with a power-law photon index less-than-or-similar-to 1. A search for periodic modulation from the point source yields upper limits ranging from 10%-35% for periods between 0.025 and 1000 s, depending on the assumed pulse shape. No aperiodic variability on timescales of from 10(3) to 10(8) s is required, although a factor of approximately 2 change between the Einstein and ROSAT eras is possible. We show that the point source cannot represent thermal emission from the surface of a young neutron star and is unlikely to be explained as nonthermal, Crab-like X-ray pulses or a small synchrotron nebula. The most likely models involve accretion-powered systems-either a wind-fed neutron star with a massive companion or a low-mass X-ray binary. In all probability, this is the youngest X-ray binary in the Galaxy. C1 LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. UNIV CAMBRIDGE,INST ASTRON,CAMBRIDGE CB3 0HA,ENGLAND. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. RP HELFAND, DJ (reprint author), COLUMBIA UNIV,DEPT ASTRON,NEW YORK,NY 10027, USA. RI White, Richard/A-8143-2012 NR 32 TC 21 Z9 21 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 20 PY 1994 VL 434 IS 2 BP 627 EP 634 DI 10.1086/174764 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PL837 UT WOS:A1994PL83700024 ER PT J AU HAILEY, CJ CRAIG, WW AF HAILEY, CJ CRAIG, WW TI SPECTROSCOPY OF THE SUPERNOVA REMNANT CTB-1 SO ASTROPHYSICAL JOURNAL LA English DT Article DE ISM, ABUNDANCES; ISM, INDIVIDUAL (CTB-1); SUPERNOVA REMNANTS ID WIND-DRIVEN BUBBLES; NOVA REMNANTS; OPTICAL-EMISSION; MAGELLANIC CLOUD; WAVE THEORY; 2.7 GHZ; EVOLUTION; MULTIWAVELENGTH; EXPLOSIONS; MODELS AB We have obtained spectra at 11 positions within the supernova remnant CTB 1 using the Automated Multi-Object Spectrometer (AMOS) at Lick Observatory. We determined the bulk velocity of the remnant and performed a global study of important emission lines from the shock-heated ISM. As these are the first results reported from this instrument, we chose some positions to overlap those of earlier observers. We measured a mean velocity for the remant of -35 +/- 6 km s-1 placing CTB 1 at a kinematic distance of 3.1 +/- 0.4 kpc. This distance corresponds to that of an OB association in the Perseus arm. We also establish a probable age for the remnant of approximately 7500-11,000 years. The spatially resolved spectroscopy reveals a significant gradient in the strength of the [N II] forbidden lines as a function of azimuthal distance along the rim of the remnant. The most likely explanation for this gradient is a smooth variation in the density in the ambient ISM, which would produce a similar variation in the radiative shock velocity. The wide range in line ratio values across the remnant indicate that caution must be exercised when evaluating global properties of supernova remnants based on spectra from only a few filaments in individual remnants. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP HAILEY, CJ (reprint author), LAWRENCE LIVERMORE NATL LAB,EXPTL ASTROPHYS LAB,L-296,POB 808,LIVERMORE,CA 94550, USA. NR 36 TC 12 Z9 12 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 20 PY 1994 VL 434 IS 2 BP 635 EP 640 DI 10.1086/174765 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PL837 UT WOS:A1994PL83700025 ER PT J AU GHEZ, AM EMERSON, JP GRAHAM, JR MEIXNER, M SKINNER, CJ AF GHEZ, AM EMERSON, JP GRAHAM, JR MEIXNER, M SKINNER, CJ TI 10 MICRON IMAGING OF UZ TAURI - EVIDENCE FOR CIRCUMSTELLAR DISK CLEARING DUE TO A CLOSE COMPANION STAR SO ASTROPHYSICAL JOURNAL LA English DT Article DE BINARIES, VISUAL; CIRCUMSTELLAR MATTER; INFRARED, STARS; STARS, INDIVIDUAL (UZ TAURI); STARS, PRE-MAIN-SEQUENCE ID MAIN-SEQUENCE STARS; T-TAURI; POLARIZATION SURVEY; ACCRETION DISKS; FORBIDDEN-LINE; BINARY; AURIGA; DUST; MULTIPLICITY; PHOTOMETRY AB We present 10 mum images of the multiple T Tauri star system UZ Tau taken with the Berkeley mid-infrared array camera at UKIRT and evidence that UZ Tau E and W are a common proper pair. The mid-infrared emission is resolved for the first time into the two components UZ Tau E and UZ Tau W. The mid-infrared excess deduced for UZ Tau W appears to be much lower than that observed for UZ Tau E. This excess emission is consistent with an optically thin circumstellar disk in the case of UZ Tau W, whereas UZ Tau E's excess is consistent with an optically thick disk. We suggest that the close binary star pair in UZ Tau W is responsible for the observed difference between UZ Tau E and W's mid-infrared excess. In the proposed model, the binary star interacts with the local circumstellar disk environment and clears out much of the material inside its orbital radius (approximately 50 AU). As a result, the hot dust, observed at mid-infrared wavelengths, in UZ Tau W is suppressed compared to its ''wider'' companion UZ Tau E. This scenario can also plausibly account for differences observed in UZ Tau E's and UZ Tau W's optical line strengths and profiles. C1 QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. UNIV CALIF LOS ANGELES,DEPT ASTRON,LOS ANGELES,CA 90024. UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720. RP GHEZ, AM (reprint author), UNIV ARIZONA,STEWARD OBSERV,TUCSON,AZ 85721, USA. NR 38 TC 24 Z9 24 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 20 PY 1994 VL 434 IS 2 BP 707 EP 712 DI 10.1086/174772 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PL837 UT WOS:A1994PL83700032 ER PT J AU KINNISON, DE JOHNSTON, HS WUEBBLES, DJ AF KINNISON, DE JOHNSTON, HS WUEBBLES, DJ TI MODEL STUDY OF ATMOSPHERIC TRANSPORT USING CARBON-14 AND STRONTIUM-90 AS INERT TRACERS SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID EXCESS C-14 DATA; 2-DIMENSIONAL MODEL AB The observed excess carbon 14 in the atmosphere from 1963 to 1970 provides unique, but limited, data up to an altitude of about 35 km for testing the air motions calculated by 11 multidimensional atmospheric models. Strontium 90 measurements in the atmosphere from 1964 to mid-1967 provide data that have more latitude coverage than those of carbon 14 and are useful for testing combined models of air motions and aerosol settling. Model calculations for carbon 14 begin at October 1963, 9 months after the conclusion of the nuclear bomb tests; the initial conditions for the calculations are derived by three methods, each of which agrees fairly well with measured carbon 14 in October 1963 and each of which has widely different values in regions of the stratosphere where there were no carbon 14 measurements. The model results are compared to the stratospheric measurements, not as if the observed data were absolute standards, but in an effort to obtain new insight about the models and about the atmosphere. The measured carbon 14 vertical profiles at 31 degrees N are qualitatively different from all of the models; the measured vertical profiles show a maximum mixing ratio in the altitude range of 20 to 25 km from October 1963 through July 1966, but all modeled profiles show mixing ratio maxima that increase in altitude from 20 km in October 1963 to greater than 40 km by April 1966. Both carbon 14 and strontium 90 data indicate that the models differ substantially among themselves with respect to stratosphere-troposphere exchange rate, but the modeled carbon 14 stratospheric residence times indicate that differences among the models are small with respect to transport rate between the middle stratosphere and the lower stratosphere. Strontium 90 data indicate that aerosol settling is important up to at least 35 km altitude. Relative to the measurements, about three quarters of the models transport carbon 14 from the lower stratosphere to the troposphere too rapidly, and all models with all three sets of initial conditions appear to sweep carbon 14 out of the midstratosphere (above 28 km) much more slowly than was observed from 1963 to 1970. Atmospheric dynamicists should seriously consider what the carbon 14 measurements imply with respect to advection in the midstratosphere. C1 UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA USA. RP KINNISON, DE (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 808, L-262, LIVERMORE, CA 94550 USA. NR 18 TC 15 Z9 15 U1 3 U2 8 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 OCT 20 PY 1994 VL 99 IS D10 BP 20647 EP 20664 DI 10.1029/94JD01822 PG 18 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA PN309 UT WOS:A1994PN30900013 ER PT J AU BENKOVITZ, CM BERKOWITZ, CM EASTER, RC NEMESURE, S WAGENER, R SCHWARTZ, SE AF BENKOVITZ, CM BERKOWITZ, CM EASTER, RC NEMESURE, S WAGENER, R SCHWARTZ, SE TI SULFATE OVER THE NORTH-ATLANTIC AND ADJACENT CONTINENTAL REGIONS - EVALUATION FOR OCTOBER AND NOVEMBER 1986 USING A 3-DIMENSIONAL MODEL-DRIVEN BY OBSERVATION-DERIVED METEOROLOGY SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID LONG-RANGE TRANSPORT; TRANSFORMATION-REMOVAL MODEL; GLOBAL CLOUD ALBEDO; DIMETHYL SULFIDE; DRY DEPOSITION; NUMERICAL-MODELS; SULFUR EMISSIONS; ADVECTION SCHEME; RESIDENCE TIMES; AEROSOL SULFATE AB A high-resolution three-dimensional Eulerian transport and transformation model has been developed to simulate concentrations of tropospheric sulfate for specific times and locations; it was applied over the North Atlantic and adjacent continental regions during October and November 1986. The model represents emissions of anthropogenic SO2 and sulfate and of biogenic sulfur species, horizontal and vertical transport, gas phase oxidation of SO2 and dimethylsulfide, aqueous phase oxidation of SO2, and wet and dry deposition of SO2, sulfate, and methanesulfonic acid (MSA). The meteorological driver is the 6-hour output from the forecast model of the European Centre for Medium-Range Weather Forecasts. Calculated sulfate concentrations and column burdens, examined in detail for specific dates, are related to existing weather patterns. These quantities exhibit rich temporal and spatial structure; the characteristic (1/e) autocorrelation time for the sulfate column burdens over the central North Atlantic averages 10 hours; 95% of the values are 25 hours or less. The characteristic distance of spatial autocorrelation over this region depends on direction; the minimum value of the average is 900 km and the minimum values for the 10th and 90th percentiles are 400 and 1700 km. Daily average model sulfate concentrations at the lowest vertical level accurately represent the spatial variability, episodicity, and absolute magnitudes of surface concentrations measured by monitoring stations in Europe, Canada, New York state, and Barbados; over 50% of model concentrations are within a factor of 3 of the observations. Over 50% of weekly model sulfate wet deposition amounts are within a factor of 3 of observations from U.S. monitoring stations. Over the 34-day period modeled, contributions from anthropogenic emissions to the sulfate over the mid North Atlantic Ocean ranged from 44 to 66%, contributions from biogenic emissions were between 6 and 12%. Calculated average yields for sulfate (47 to 72%) and MSA (13%), and turnover times for SO2 (2 to 3 days) and sulfate and MSA (4 to 8 days) are comparable to previous estimates; however, these quantities depend on meteorological conditions and on the geographical and vertical distributions of the material. C1 PACIFIC NW LAB, CTR EARTH & ENVIRONM SCI, RICHLAND, WA 99352 USA. RP BENKOVITZ, CM (reprint author), BROOKHAVEN NATL LAB, DIV ENVIRONM CHEM, UPTON, NY 11973 USA. RI Wagener, Richard/B-5445-2008; Schwartz, Stephen/C-2729-2008 OI Wagener, Richard/0000-0003-3892-1182; Schwartz, Stephen/0000-0001-6288-310X NR 99 TC 103 Z9 104 U1 0 U2 4 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 OCT 20 PY 1994 VL 99 IS D10 BP 20725 EP 20756 DI 10.1029/94JD01634 PG 32 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA PN309 UT WOS:A1994PN30900020 ER PT J AU RANDALL, DA CESS, RD BLANCHET, JP CHALITA, S COLMAN, R DAZLICH, DA DELGENIO, AD KEUP, E LACIS, A LETREUT, H LIANG, XZ MCAVANEY, BJ MAHFOUF, JF MELESHKO, VP MORCRETTE, JJ NORRIS, PM POTTER, GL RIKUS, L ROECKNER, E ROYER, JF SCHLESE, U SHEININ, DA SOKOLOV, AP TAYLOR, KE WETHERALD, RT YAGAI, I ZHANG, MH AF RANDALL, DA CESS, RD BLANCHET, JP CHALITA, S COLMAN, R DAZLICH, DA DELGENIO, AD KEUP, E LACIS, A LETREUT, H LIANG, XZ MCAVANEY, BJ MAHFOUF, JF MELESHKO, VP MORCRETTE, JJ NORRIS, PM POTTER, GL RIKUS, L ROECKNER, E ROYER, JF SCHLESE, U SHEININ, DA SOKOLOV, AP TAYLOR, KE WETHERALD, RT YAGAI, I ZHANG, MH TI ANALYSIS OF SNOW FEEDBACKS IN 14 GENERAL-CIRCULATION MODELS SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID CLIMATE FEEDBACK; SURFACE ALBEDO; SEA ICE; COVER AB Snow feedbacks produced by 14 atmospheric general circulation models have been analyzed through idealized numerical experiments. Included in the analysis is an investigation of the surface energy budgets of the models. Negative or weak positive snow feedbacks occurred in some of the models, while others produced strong positive snow feedbacks. These feedbacks are due not only to melting snow, but also to increases in boundary temperature, changes in air temperature, changes in water vapor, and changes in cloudiness. As a result, the net response of each model is quite complex. We analyze in detail the responses of one model with a strong positive snow feedback and another with a weak negative snow feedback. Some of the models include a temperature dependence of the snow albedo, and this has significantly affected the results. C1 SUNY STONY BROOK, INST TERR & PLANETARY ATMOSPHERES, MARINE SCI RES CTR, STONY BROOK, NY 11794 USA. CANADIAN CLIMATE CTR, ATMOSPHER ENVIRONM SERV, DOWNSVIEW, ON, CANADA. LAB METEOROL DYNAM, PARIS, FRANCE. BUR METEOROL RES CTR, MELBOURNE, VIC 3001, AUSTRALIA. NASA, GODDARD INST SPACE STUDIES, NEW YORK, NY 10025 USA. UNIV HAMBURG, MAX PLANCK INST METEOROL, W-2000 HAMBURG 13, GERMANY. SUNY ALBANY, ATMOSPHER SCI RES CTR, ALBANY, NY 12205 USA. CTR NATL RECH METEOROL, METRO FRANCE, F-31057 TOULOUSE, FRANCE. VOEIKOV MAIN GEOPHYS OBSERV, ST PETERSBURG, RUSSIA. EUROPEAN CTR MEDIUM RANGE WEATHER FORECASTS, READING RG2 9AX, BERKS, ENGLAND. UNIV CALIF SAN DIEGO, SCRIPPS INST OCEANOG, CLIMATE RES GRP, SAN DIEGO, CA 92093 USA. LAWRENCE LIVERMORE NATL LAB, PROGRAM CLIMATE MODEL DIAG & INTERCOMPARISON, LIVERMORE, CA 94550 USA. PRINCETON UNIV, NOAA, GEOPHYS FLUID DYNAM LAB, PRINCETON, NJ 08542 USA. METEOROL RES INST, TSUKUBA, IBARAKI 305, JAPAN. RP RANDALL, DA (reprint author), COLORADO STATE UNIV, DEPT ATMOSPHER SCI, FT COLLINS, CO 80523 USA. RI Taylor, Karl/F-7290-2011; Lacis, Andrew/D-4658-2012; Del Genio, Anthony/D-4663-2012; Randall, David/E-6113-2011; Meleshko, Valentin/D-2157-2016; Norris, Peter/H-2008-2012 OI Taylor, Karl/0000-0002-6491-2135; Del Genio, Anthony/0000-0001-7450-1359; Randall, David/0000-0001-6935-4112; Norris, Peter/0000-0001-6807-9884 NR 21 TC 48 Z9 50 U1 0 U2 5 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 OCT 20 PY 1994 VL 99 IS D10 BP 20757 EP 20771 DI 10.1029/94JD01633 PG 15 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA PN309 UT WOS:A1994PN30900021 ER PT J AU WANG, J CAFFREY, M BEDZYK, MJ PENNER, TL AF WANG, J CAFFREY, M BEDZYK, MJ PENNER, TL TI STRUCTURE CHANGES IN MODEL MEMBRANES MONITORED BY VARIABLE PERIOD X-RAY STANDING WAVES - EFFECT OF LANGMUIR-BLODGETT-FILM THICKNESS ON THERMAL-BEHAVIOR SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ELECTRON-DIFFRACTION; REFLECTION; MONOLAYERS; ACID; SPECTROSCOPY; STEARATE; ORDER; MULTILAYERS; ARACHIDATE; STABILITY AB Variable period X-ray standing wave (XSW) measurements have been used previously to monitor and to interpret structure rearrangements undergone during a phase transition in a model membrane with angstrom resolution. In the present study, an extended length scale ranging from 40 up to ca. 1000 Angstrom has been used without sacrificing resolution to address the question of whether the phase transition characteristics of a Lipid multilayer are sensitive to the number and identity of the lamellae in the membrane stack. The system chosen for examination consisted of an octadecanethiol (ODT) coated gold mirror on top of which a variable number (0, 2, 8, and 16) of omega-tricosenoic acid (C23, omega TA) bilayers followed by a single upper inverted bilayer of zinc arachidate (C20, ZnA) was deposited by the Langmuir-Blodgett (LB) technique. Variable period XSW measurements provided precise information on the zinc layer mean position and width and were used to track the collapse of the heavy atom layer during the thermotropic phase transition. Samples with and without the omega TA layers showed;disparate pretransitional rearrangements, transition temperatures, and apparent cooperativity as well as final high-temperature zinc distribution. At sufficiently high temperatures, the ODT monolayer appears to desorb from the gold mirror surface to be replaced by a layer of zinc. In all samples containing omega TA, the cooperative transition occurred at ca. 72 degrees C, which has been shown by simultaneous calorimetry and low- and wide-angle time-resolved X-ray diffraction to correspond to the onset of melting of bulk omega TA. Thus, the remarkable result that bulk behavior is displayed by as few as two LB bilayers of omega TA. With all thin film samples, the temperature-induced structure change was not reversed upon cooling to and subsequent storage at room temperature. C1 OHIO STATE UNIV,DEPT CHEM,COLUMBUS,OH 43210. NORTHWESTERN UNIV,DEPT MAT SCI & ENGN,EVANSTON,IL 60208. ARGONNE NATL LAB,MSD,ARGONNE,IL 60439. EASTMAN KODAK CO,CORP RES LABS,ROCHESTER,NY 14650. RI Bedzyk, Michael/B-7503-2009; Bedzyk, Michael/K-6903-2013 NR 49 TC 23 Z9 24 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD OCT 20 PY 1994 VL 98 IS 42 BP 10957 EP 10968 DI 10.1021/j100093a044 PG 12 WC Chemistry, Physical SC Chemistry GA PN080 UT WOS:A1994PN08000044 ER PT J AU WRIGHT, JK WILLIAMSON, RL MAGGS, KJ AF WRIGHT, JK WILLIAMSON, RL MAGGS, KJ TI FINITE-ELEMENT ANALYSIS OF THE EFFECTIVENESS OF INTERLAYERS IN REDUCING THERMAL RESIDUAL-STRESSES IN DIAMOND FILMS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID CERAMIC-METAL INTERFACES; RAMAN-SPECTROSCOPY; MATRIX COMPOSITES; JOINTS; STRENGTH; ADHESION; COATINGS; FRACTURE; STRAINS AB The residual stresses resulting from cooling of diamond thin films deposited at elevated temperature have been investigated using finite element analysis. Interlayers of various properties and thicknesses between the diamond and substrate have been simulated to determine the potential for residual stress reduction. Interlayer materials of WC, Si3N4 and TiC with tungsten and WC-6%Co substrates were modeled. Multiple interlayer systems composed of Si3N4, Si and WC, with Si3N4 next to the diamond and WC next to the WC-6%Co substrate, were also modeled to determine if residual stress advantages could be obtained by a simplified gradient material approach. These studies were supplemented by parametric studies to determine the effects of interlayer thickness, elasticity, plasticity and thermal expansion coefficients. Although thermal expansivity is the most significant property in elastic interlayers, the yield strength is most critical in plastic interlayers. C1 US BUR MINES,RENO RES CTR,RENO,NV 89512. RP WRIGHT, JK (reprint author), IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. OI Wright, Jill/0000-0001-8909-8144; Williamson, Richard/0000-0001-7734-3632 NR 42 TC 41 Z9 41 U1 0 U2 8 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD OCT 20 PY 1994 VL 187 IS 1 BP 87 EP 96 DI 10.1016/0921-5093(94)90334-4 PG 10 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA PJ591 UT WOS:A1994PJ59100010 ER PT J AU FARBER, DL WILLIAMS, Q RYERSON, FJ AF FARBER, DL WILLIAMS, Q RYERSON, FJ TI DIFFUSION IN MG2SIO4 POLYMORPHS AND CHEMICAL HETEROGENEITY IN THE MANTLE TRANSITION ZONE SO NATURE LA English DT Article ID DISLOCATION RECOVERY; HIGH-PRESSURE; OLIVINE; CREEP; MG; SPINEL AB DIFFUSION in silicates plays a key role in a number of processes in the Earth's mantle, including viscous flow(1-4), electrical conductance(5-8) and the homogenization of chemical heterogeneities. Although cation diffusion rates have been measured in olivine at high pressures(9,10), no data exist on the chemical transport properties of the silicate phases thought to predominate in the transition zone of the mantle (from 400 to 700 km depth). Here we present measurements of cation diffusion in the alpha-olivine phase and high-pressure beta- and gamma-spinel phases of Mg2SiO4 at pressures up to 14 GPa. We find that diffusion rates in both high-pressure phases are about three orders of magnitude faster than that of olivine. When coupled with convective thinning, these faster diffusion rates suggest that the transition zone is more efficient at mixing chemical heterogeneities than the olivine-dominated upper mantle. Furthermore, we calculate that the minimum size of chemical heterogeneities in the transition zone should be of the order of metres. C1 UNIV CALIF SANTA CRUZ,DEPT EARTH SCI,SANTA CRUZ,CA 95064. UNIV CALIF SANTA CRUZ,INST TECTON,SANTA CRUZ,CA 95064. LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. RI Farber, Daniel/F-9237-2011 NR 28 TC 25 Z9 25 U1 0 U2 2 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD OCT 20 PY 1994 VL 371 IS 6499 BP 693 EP 695 DI 10.1038/371693a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PM773 UT WOS:A1994PM77300052 ER PT J AU FRABETTI, PL CHEUNG, HWK CUMALAT, JP DALLAPICCOLA, C GINKEL, JF GREENE, SV JOHNS, WE NEHRING, MS BUTLER, JN CIHANGIR, S GAINES, I GARBINCIUS, PH GARREN, L GOURLAY, SA HARDING, DJ KASPER, P KREYMER, A LEBRUN, P SHUKLA, S BIANCO, S FABBRI, FL SARWAR, S ZALLO, A CULBERTSON, R GARDNER, RW GREENE, R WISS, J ALIMONTI, G BELLINI, G CACCIANIGA, B CINQUINI, L DICORATO, M GIAMMARCHI, M INZANI, P LEVERARO, F MALVEZZI, S MENASCE, D MERONI, E MORONI, L PEDRINI, D PERASSO, L SALA, A SALA, S TORRETTA, D VITTONE, M BUCHHOILZ, D CLAES, D GOBBI, B OREILLY, B BISHOP, JM CASON, NM KENNEDY, CJ KIM, GN LIN, TF PUSELJIC, DL RUCHTI, RC SHEPHARD, WD SWIATEK, JA WU, ZY ARENA, V BOCA, G CASTOLDI, C GIANINI, G RATTI, SP RICCARDI, C VIOLA, L VITULO, P LOPEZ, A GRIM, GP PAOLONE, VS YAGER, PM WILSON, JR SHELDON, PD DAVENPORT, F BLACKETT, GR PISHARODY, M HANDLER, T CHEON, BG KANG, JS KIM, KY AF FRABETTI, PL CHEUNG, HWK CUMALAT, JP DALLAPICCOLA, C GINKEL, JF GREENE, SV JOHNS, WE NEHRING, MS BUTLER, JN CIHANGIR, S GAINES, I GARBINCIUS, PH GARREN, L GOURLAY, SA HARDING, DJ KASPER, P KREYMER, A LEBRUN, P SHUKLA, S BIANCO, S FABBRI, FL SARWAR, S ZALLO, A CULBERTSON, R GARDNER, RW GREENE, R WISS, J ALIMONTI, G BELLINI, G CACCIANIGA, B CINQUINI, L DICORATO, M GIAMMARCHI, M INZANI, P LEVERARO, F MALVEZZI, S MENASCE, D MERONI, E MORONI, L PEDRINI, D PERASSO, L SALA, A SALA, S TORRETTA, D VITTONE, M BUCHHOILZ, D CLAES, D GOBBI, B OREILLY, B BISHOP, JM CASON, NM KENNEDY, CJ KIM, GN LIN, TF PUSELJIC, DL RUCHTI, RC SHEPHARD, WD SWIATEK, JA WU, ZY ARENA, V BOCA, G CASTOLDI, C GIANINI, G RATTI, SP RICCARDI, C VIOLA, L VITULO, P LOPEZ, A GRIM, GP PAOLONE, VS YAGER, PM WILSON, JR SHELDON, PD DAVENPORT, F BLACKETT, GR PISHARODY, M HANDLER, T CHEON, BG KANG, JS KIM, KY TI OBSERVATION AND MASS MEASUREMENT OF OMEGA(C)(O)-]SIGMA+K-K-PI+ SO PHYSICS LETTERS B LA English DT Article ID STRANGE AB We present evidence for the OMEGA(c)0 in a new decay mode OMEGA(c)0 --> SIGMA+K-K-pi+, for which we find 42.5+/-8.8 events with a mass of 2699.9+/-1.5+/-2.5 MeV/c2. The data are from Fermilab high energy photoproduction experiment E687. C1 INFN,I-40126 BOLOGNA,ITALY. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV ILLINOIS,URBANA,IL 61801. UNIV MILAN,DIP FIS,I-20133 MILAN,ITALY. INFN,I-20133 MILAN,ITALY. NORTHWESTERN UNIV,EVANSTON,IL 60208. UNIV NOTRE DAME,NOTRE DAME,IN 46556. UNIV PAVIA,DIP FIS NUCL & TEOR,I-27100 PAVIA,ITALY. INFN,I-27100 PAVIA,ITALY. UNIV PUERTO RICO,MAYAGUEZ,PR 00708. UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV S CAROLINA,COLUMBIA,SC 29208. VANDERBILT UNIV,NASHVILLE,TN 37235. UNIV N CAROLINA,ASHEVILLE,NC 28804. UNIV TENNESSEE,KNOXVILLE,TN 37996. KOREA UNIV,SEOUL 136701,SOUTH KOREA. RP FRABETTI, PL (reprint author), UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. NR 10 TC 40 Z9 40 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD OCT 20 PY 1994 VL 338 IS 1 BP 106 EP 110 DI 10.1016/0370-2693(94)91351-X PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PM426 UT WOS:A1994PM42600018 ER PT J AU KAUKASOINA, P LINDROOS, M WARREN, OL THIEL, PA AF KAUKASOINA, P LINDROOS, M WARREN, OL THIEL, PA TI STRUCTURAL DETERMINATION OF AN INTERMIXED (1X2) AU FILM ON PD(110) BY DYNAMICAL LOW-ENERGY ELECTRON-DIFFRACTION ANALYSIS SO SURFACE SCIENCE LA English DT Article ID RECONSTRUCTED AU(110) SURFACE; PT(110)-(1X2) SURFACE; ION-SCATTERING; GROWTH MODE; MULTILAYER RELAXATION; SANDWICH SEGREGATION; 110 SURFACE; LEED; AG(110); TEMPERATURE AB The geometric structure of a (1 x 2) Au film on Pd(110) has been determined by dynamical low-energy electron-diffraction analysis. The concentration profile of Au in the surface region is determined in the analysis, and the results clearly reveal the presence of intermixed layers beneath two layers of essentially pure Au. As for the optimum geometry of the film, the topmost layer is of the missing-row type, the second layer is row-paired by 0.10 angstrom, the third layer is rumpled by 0.07 angstrom, and the first three interlayer spacings are relaxed by DELTAd12 = -6.6%, DELTAd23 = + 5.1%, and DELTAd34 = + 3.6% relative to the bulk-truncated substrate. (Deeper interlayer spacings are at or near the bulk value.) The optimum geometry of the intermixed Au film differs considerably from that of the (1 x 2) missing-row reconstruction of bulk Au(110), but can be rationalized in terms of conservation of volume density as a response to the 4.8% lattice mismatch between Au and Pd. C1 IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. TAMPERE UNIV TECHNOL, SF-33101 TAMPERE, FINLAND. IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. NR 56 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 EI 1879-2758 J9 SURF SCI JI Surf. Sci. PD OCT 20 PY 1994 VL 318 IS 3 BP 243 EP 252 DI 10.1016/0039-6028(94)90098-1 PG 10 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA PM448 UT WOS:A1994PM44800009 ER PT J AU RODRIGUEZ, JA AF RODRIGUEZ, JA TI ELECTRONIC INTERACTIONS IN BIMETALLIC BONDING - MOLECULAR-ORBITAL STUDY OF PD/AL(111) AND AU/AL(111) SO SURFACE SCIENCE LA English DT Article ID TRANSITION-METAL ATOMS; EFFECTIVE CORE POTENTIALS; X-RAY; CHEMICAL-PROPERTIES; PALLADIUM FILMS; CARBON-MONOXIDE; PD MONOLAYERS; AU FILMS; SURFACE; PHOTOEMISSION AB The interaction of Pd and Au with Al(111) has been studied using ab initio SCF calculations and cluster models. The bonding mechanism of Pd and Au on Al(111) involves electron transfer from the valence d orbitals of the admetals toward the substrate, and a compensating charge transfer from the substrate into the valence (s,p) orbitals of the admetals. Pd behaves as a net electron donor (Pd(delta+), delta almost-equal-to 0.25e), while Au acts as a net electron acceptor (Au(delta-), delta almost-equal-to 0.10e). In spite of this difference in the net direction of charge transfer, both admetals show shifts toward higher binding energy in their d bands, as a consequence of losses in the d-electron population. The electronic perturbations observed after bonding Pd to Al are as large as those found for Pd bonded to early-transition metals, and much bigger than those found when Pd is bonded to late-transition metals. Similar trends are seen for Au adatoms. In general, the reduction in the Pd(4d) or Au(5d) population increases when the fraction of empty states in the valence band of the substrate rises. Changes in the electronic and chemical properties of Pd overlayers (positive binding-energy shifts in the core and valence levels of the admetal, decrease in the work function of the substrate, reduction in the CO-desorption temperature from Pd) can be explained in terms of a simple model that involves Pd(4d) --> substrate charge transfer and Pd(4d) --> Pd(5s,5p) rehybridization. RP RODRIGUEZ, JA (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 79 TC 32 Z9 32 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD OCT 20 PY 1994 VL 318 IS 3 BP 253 EP 261 DI 10.1016/0039-6028(94)90099-X PG 9 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA PM448 UT WOS:A1994PM44800010 ER PT J AU HAMZA, AV YKES, J MOSLEY, WD DINH, L BALOOCH, M AF HAMZA, AV YKES, J MOSLEY, WD DINH, L BALOOCH, M TI REACTION AND PASSIVATION OF ALUMINUM WITH C-60 SO SURFACE SCIENCE LA English DT Article ID AL(110) SURFACE; C-60; SI(111)-(7X7) AB The interaction of C60 with aluminum was investigated using Auger electron spectroscopy (AES), temperature programmed desorption (TPD), photoluminescence and soft X-ray photoelectron spectroscopy. The interaction of C70 with aluminum was also probed with soft X-ray photoelectron spectroscopy. The bonding of C60 and C70 to the aluminum surface is strong such that after multilayer desorption at 570 and 620 K, respectively, a monolayer coverage of the fullerene remains intact, as seen in the valence band spectra, on the surface to 700 K. Above surface temperatures of 700 K the continued presence of a C60 photoluminescence signal and the decline in the surface carbon concentration suggests that the C60 dissolves into the aluminum bulk. The chemical shift in the binding energy of the Al 2p electrons also indicates strong interaction between C60 and aluminum. Multilayer and monolayer coverages of C60 on aluminum passivated the surface such that exposures of 340 L of water at room temperature led to no oxidation of the surface. Multilayer coverages of C60 on aluminum were protective against oxidation at ambient conditions. RP HAMZA, AV (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94551, USA. NR 18 TC 25 Z9 25 U1 2 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD OCT 20 PY 1994 VL 318 IS 3 BP 368 EP 378 DI 10.1016/0039-6028(94)90111-2 PG 11 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA PM448 UT WOS:A1994PM44800022 ER PT J AU ITCHKAWITZ, BS LYMAN, PF OWNBY, GW ZEHNER, DM AF ITCHKAWITZ, BS LYMAN, PF OWNBY, GW ZEHNER, DM TI MONOLAYER GRAPHITE ON TAC(111) - ELECTRONIC BAND-STRUCTURE SO SURFACE SCIENCE LA English DT Article ID METAL CARBIDE SURFACES; TIC(111) SURFACE; PHONON-DISPERSION; STATES; BOND; PT(111); SYSTEM AB The electronic band structure of the monolayer graphite/TaC(111) system was examined using XPS, AES, and ARUPS and the results were compared with predictions of the rigid-band model to determine its validity. The measured graphite sigma1 band energy relative to the Fermi energy is -23.0 eV at GAMMABAR and the pi1 band energy is -10.3 eV at GAMMABAR and -3.4 eV at KBAR. By comparing these values to the results of a linearized augmented-plane-wave calculation of the electronic structure of an isolated graphite monolayer, the qualitative picture of charge transfer from the substrate into the graphite overlayer is confirmed, but the rigid-band model is not sufficient to explain the observed binding energy differences between experiment and theory. The degree of hybridization between the electronic bands of TaC and the graphite monolayer is therefore not negligible and should be included in descriptions of the electronic band structures of such systems. C1 OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. UNIV PENN, DEPT PHYS, PHILADELPHIA, PA 19104 USA. NR 24 TC 13 Z9 13 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 EI 1879-2758 J9 SURF SCI JI Surf. Sci. PD OCT 20 PY 1994 VL 318 IS 3 BP 395 EP 402 DI 10.1016/0039-6028(94)90113-9 PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA PM448 UT WOS:A1994PM44800024 ER PT J AU BENGALI, AA SCHULTZ, RH MOORE, CB BERGMAN, RG AF BENGALI, AA SCHULTZ, RH MOORE, CB BERGMAN, RG TI ACTIVATION OF THE C-H BONDS IN NEOPENTANE AND NEOPENTANE-D(12) BY (ETA(5)-C-5(CH3)(5))RH(CO)(2) - SPECTROSCOPIC AND TEMPORAL RESOLUTION OF RHODIUM-KRYPTON AND RHODIUM-ALKANE COMPLEX INTERMEDIATES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID FEMTOSECOND TRANSIENT ABSORPTION; TRANSITION-METAL COMPLEXES; RESOLVED IR SPECTROSCOPY; OXIDATIVE ADDITION; SATURATED-HYDROCARBONS; NAKED CR(CO)5; PHOTOCHEMISTRY; METHANE; PENTACARBONYLS; CYCLOHEXANE AB The photoinitiated reaction of Cp*Rh(CO)(2)l with neopentane and neopentane-d(12) in liquid krypton has been studied with low-temperature IR flash kinetic spectroscopy. Photolysis of Cp*Rh(CO)(2) generates a single transient absorption at 1946 cm(-1) which is assigned to the Cp*Rh(CO)(Kr) complex. This complex reacts with (CH3)(4)C to form the C-H activated neopentyl hydride product observed at 2008 cm(-1). Confirming earlier flash kinetic results with cyclohexane, the results are consistent with a pre-equilibrium mechanism in which an initially formed transient krypton complex Cp*Rh(CO)(Kr) is in rapid equilibrium with a transient (uninserted) alkane complex Cp*Rh(CO)((CH3)(4)C) which then proceeds to form the neopentyl hydride in a unimolecular step. Under most conditions our mechanism requires that both Cp*Rh(CO)(Kr) and Cp*Rh(CO)(alkane) exhibit unresolved carbonyl stretching absorptions at 1946 cm(-1). However, use of (CD3)(4)C as the alkane substrate allows us, for;the first time, to spectroscopically and temporally resolve both the rhodium-krypton and rhodium-alkane complex intermediates by 1 cm(-1), lending further support for the pre-equilibrium mechanism proposed to be operative in these systems. As was observed with cyclohexane and cyclohexane-d(12), a normal isotope effect is observed for the unimolecular C-H(D) insertion step but an unusual equilibrium isotope effect (EIE) is measured for the pre-equilibrium step of the reaction: rhodium is bound an order of magnitude more strongly to (CD3)4C than to (CH3)(4)C C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. NR 38 TC 124 Z9 124 U1 0 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD OCT 19 PY 1994 VL 116 IS 21 BP 9585 EP 9589 DI 10.1021/ja00100a024 PG 5 WC Chemistry, Multidisciplinary SC Chemistry GA PN452 UT WOS:A1994PN45200024 ER PT J AU LANG, RF JU, TD HOFF, CD BRYAN, JC KUBAS, GJ AF LANG, RF JU, TD HOFF, CD BRYAN, JC KUBAS, GJ TI SYNTHESIS AND STRUCTURE OF W(CO)(PHEN)(SPH)(2)(ETA(2)-SO2) - A TUNGSTEN(II) SULFUR-DIOXIDE COMPLEX THAT SPONTANEOUSLY EXTRUDES SULFUR TO FORM THE TUNGSTEN(VI) DIOXO COMPLEX W(PHEN)(SPH)(2)(O)(2) SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID MOLYBDENUM COMPOUNDS; OXYGEN; SO2; COORDINATION; LIGANDS; ADDUCTS; METALS; BONDS C1 UNIV MIAMI,DEPT CHEM,CORAL GABLES,FL 33124. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 30 TC 13 Z9 13 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD OCT 19 PY 1994 VL 116 IS 21 BP 9747 EP 9748 DI 10.1021/ja00100a049 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA PN452 UT WOS:A1994PN45200049 ER PT J AU RHOADES, RL GORBATKIN, SM AF RHOADES, RL GORBATKIN, SM TI SPATIAL PROFILING OF ION AND NEUTRAL EXCITATION IN NOBLE-GAS ELECTRON-CYCLOTRON-RESONANCE PLASMAS SO APPLIED PHYSICS LETTERS LA English DT Article ID TRANSPORT AB Optical emission from neutrals and ions of several noble gases has been profiled in an electron cyclotron resonance plasma system. In argon plasmas with a net microwave power of 750 W, the neutral (696.5-nm) and ion (488-nm) emission profiles are slightly center peaked at 0.32 mTorr and gradually shift to a hollow appearance at 2.5 mTorr. Neon profiles show a similar trend from 2.5 to 10.0 mTorr. For the noble gases, transition pressure scales with the ionization potential of the gas, which is consistent with neutral depletion. Studies of noble gas mixtures, however, indicate that neutral depletion is not always dominant in the formation of hollow profiles. For Kr/Ar, Ar/Ne, and Ne/He plasmas, the majority gas tends to set the overall shape of the profile at any given pressure. For the conditions of the current system, plasma density appears to be more dominant than electron temperature in the formation of hollow profiles. The general method described is also a straightforward, inexpensive technique for measuring the spatial distribution of power deposited in plasmas, particularly where absolute scale can be calibrated by some other means. (C) 1994 American Institute of Physics. RP RHOADES, RL (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,MS 6057,OAK RIDGE,TN 37831, USA. NR 9 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 17 PY 1994 VL 65 IS 16 BP 2004 EP 2006 DI 10.1063/1.112844 PG 3 WC Physics, Applied SC Physics GA PM429 UT WOS:A1994PM42900008 ER PT J AU ZHU, S LOWNDES, DH BUDAI, JD NORTON, DP AF ZHU, S LOWNDES, DH BUDAI, JD NORTON, DP TI INPLANE ALIGNED CEO2 FILMS GROWN ON AMORPHOUS SIO2 SUBSTRATES BY ION-BEAM-ASSISTED PULSED-LASER DEPOSITION SO APPLIED PHYSICS LETTERS LA English DT Article ID YTTRIA-STABILIZED ZIRCONIA; THIN-FILMS; BUFFER LAYERS; YBA2CU3O7-X; EPITAXY AB Both (001)-and (111)-oriented CeO2 thin films have been grown on amorphous fused silica (SiO2) substrates by ion-beam assisted pulsed laser ablation of a polycrystalline CeO2 target. Using 200 eV Ar+ ions incident at 55-degrees to the substrate normal, the preferred orientation for CeO2 film growth is (001) at room temperature, but changes to (111) for temperatures greater-than-or-equal-to300 -degrees-C. Furthermore, the ion-beam assisted CeO2 films exhibit strong in-plane crystallographic alignment. In contrast, CeO2 films grown without ion-beam assistance exhibit a mixture of polycrystalline orientations with the relative amounts depending on growth temperature. Under optimum conditions, off-normal-incidence Ar+ ions produce a (111)-orietned crystalline CeO2 film that is aligned with respect to a single in-plane axis, on an amorphous substrate. (C) 1994 American Institute of Physics. RP ZHU, S (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. RI Budai, John/R-9276-2016 OI Budai, John/0000-0002-7444-1306 NR 14 TC 36 Z9 38 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 17 PY 1994 VL 65 IS 16 BP 2012 EP 2014 DI 10.1063/1.112847 PG 3 WC Physics, Applied SC Physics GA PM429 UT WOS:A1994PM42900011 ER PT J AU ROHATGI, A CHEN, Z DOSHI, P PHAM, T RUBY, D AF ROHATGI, A CHEN, Z DOSHI, P PHAM, T RUBY, D TI HIGH-EFFICIENCY SILICON SOLAR-CELLS BY RAPID THERMAL-PROCESSING SO APPLIED PHYSICS LETTERS LA English DT Article AB Silicon solar cell efficiencies of 16.9% have been achieved on 0.2 OMEGA cm float zone silicon, using a simplified cost effective rapid thermal process (RTP). Although the individual processing steps are not fully optimized yet, this represents the highest reported efficiency for solar cells processed with simultaneous front and back diffusion with no conventional high-temperature furnace steps. A diffusion temperature schedule coupled with an added short in situ slow cooling during RTP resulted in greater than 200 mum diffusion length and appropriate diffusion profiles for high efficiency cells. Plasma enhanced chemical vapor deposition (PECVD) of SiN/SiO2 was used for surface passivation and antireflection coating. Conventional cells fabricated by furnace diffusions and oxidations gave an efficiency of 18.8%. Process optimization can further reduce the gap between the conventional and RTP/PECVD cells. (C) 1994 American Institute of Physics. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP ROHATGI, A (reprint author), GEORGIA INST TECHNOL,UNIV CTR EXCELLENCE PHOTOVOLTA RES & EDUC,ATLANTA,GA 30332, USA. NR 7 TC 33 Z9 36 U1 1 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 17 PY 1994 VL 65 IS 16 BP 2087 EP 2089 DI 10.1063/1.112801 PG 3 WC Physics, Applied SC Physics GA PM429 UT WOS:A1994PM42900036 ER PT J AU ROSSBACH, S KULPA, DA ROSSBACH, U DEBRUIJN, FJ AF ROSSBACH, S KULPA, DA ROSSBACH, U DEBRUIJN, FJ TI MOLECULAR AND GENETIC-CHARACTERIZATION OF THE RHIZOPINE CATABOLISM (MOCABRC) GENES OF RHIZOBIUM-MELILOTI L5-30 SO MOLECULAR AND GENERAL GENETICS LA English DT Article DE RHIZOSPHERE; NUTRITIONAL MEDIATOR; PERIPLASMIC BINDING PROTEIN; GNTR-LIKE REGULATOR; DEHYDROGENASE ID SUBTILIS INOSITOL DEHYDROGENASE; OPINE-LIKE COMPOUND; NUCLEOTIDE-SEQUENCE; ESCHERICHIA-COLI; BACILLUS-SUBTILIS; ASPARTATE-AMINOTRANSFERASE; RHODOBACTER-SPHAEROIDES; 3-DIMENSIONAL STRUCTURE; PSEUDOMONAS-PUTIDA; BINDING PROTEIN AB Rhizopine (L-3-O-methyl-scyllo-inosamine, 3-O-MSI) is a symbiosis-specific compound, which is synthesized in nitrogen-fixing nodules of Medicago sativa induced by Rhizobium meliloti strain L5-30. 3-O-MSI is thought to function as an unusual growth substrate for R. meliloti L5-30, which carries a locus (mos) responsible for its synthesis closely linked to a locus (moc) responsible for its degradation. Here, the essential moc genes were delimited by Tn5 mutagenesis and shown to be organized into two regions, separated by 3 kb of DNA. The DNA sequence of a 9-kb fragment spanning the two moc regions was determined, and four genes were identified that play an essential role in rhizopine catabolism (mocABC and mocR). The analysis of the DNA sequence and the amino acid sequence of the deduced protein products revealed that MocA resembles NADH-dependent dehydrogenases. MocB exhibits characteristic features of periplasmic-binding proteins that are components of high-affinity transport systems. MocC does not share significant homology with any protein in the database. MocR shows homology with the GntR class of bacterial regulator proteins. These results suggest that the mocABC genes are involved in the uptake and subsequent degradation of rhizopine, whereas mocR is likely to play a regulatory role. C1 MICHIGAN STATE UNIV, MSU DOE PLANT RES LAB, E LANSING, MI 48824 USA. MICHIGAN STATE UNIV, NSF, CTR MICROBIAL ECOL, E LANSING, MI 48824 USA. MICHIGAN STATE UNIV, DEPT MICROBIOL, E LANSING, MI 48824 USA. NR 60 TC 42 Z9 50 U1 0 U2 2 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0026-8925 J9 MOL GEN GENET JI Mol. Gen. Genet. PD OCT 17 PY 1994 VL 245 IS 1 BP 11 EP 24 DI 10.1007/BF00279746 PG 14 WC Biochemistry & Molecular Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Genetics & Heredity GA PT696 UT WOS:A1994PT69600002 PM 7845353 ER PT J AU GUIDRY, M WU, CL FENG, DH AF GUIDRY, M WU, CL FENG, DH TI COMMENTS ON THE ORIGIN OF GAPS IN DEFORMED SINGLE-PARTICLE SPECTRA SO NUCLEAR PHYSICS A LA English DT Article ID FERMION DYNAMICAL SYMMETRY; MODEL; NUCLEI; SHAPES AB The gaps in deformed single-particle spectra that are invoked to explain many features of collective-model nuclear physics should have a fundamental explanation in terms of the underlying many-body theory. It is proposed that many of the gaps relevant for normal deformation and superdeformation originate in dynamical symmetry representation shifts that are required by the Pauli principle of the many-body system. C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. CHUNG YUAN CHRISTIAN UNIV,DEPT PHYS,CHUNGLI 32023,TAIWAN. DREXEL UNIV,DEPT PHYS & ATMOSPHER SCI,PHILADELPHIA,PA 19104. RP GUIDRY, M (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 23 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD OCT 17 PY 1994 VL 579 IS 1-2 BP 163 EP 172 DI 10.1016/0375-9474(94)90799-4 PG 10 WC Physics, Nuclear SC Physics GA PL941 UT WOS:A1994PL94100010 ER PT J AU SATCHLER, GR AF SATCHLER, GR TI A SIMPLE EFFECTIVE INTERACTION FOR PERIPHERAL HEAVY-ION COLLISIONS AT INTERMEDIATE ENERGIES SO NUCLEAR PHYSICS A LA English DT Article ID FOLDING-MODEL ANALYSIS; DENSITY-DEPENDENT INTERACTION; ALPHA-PARTICLE SCATTERING; PROTON ELASTIC-SCATTERING; ISOSPIN CHARACTER; INELASTIC-SCATTERING; GIANT-RESONANCES; PB-208 TARGET; O-17 IONS; POTENTIALS AB A very simple phenomenological nucleon-nucleon effective interaction is derived by folding-model analyses of 36 sets of heavy-ion elastic-scattering data at energies E/A between 10 and 100 MeV. It is represented by a single Yukawa term with a complex strength that varies slowly with energy. It is appropriate for peripheral collisions at intermediate energies. It is proposed for use in consistent analyses of elastic- and inelastic-scattering measurements. The possible role of spin-orbit coupling in heavy-ion elastic scattering at the higher energies is discussed. RP SATCHLER, GR (reprint author), OAK RIDGE NATL LAB, DIV PHYS, OAK RIDGE, TN 37831 USA. NR 51 TC 25 Z9 26 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 EI 1873-1554 J9 NUCL PHYS A JI Nucl. Phys. A PD OCT 17 PY 1994 VL 579 IS 1-2 BP 241 EP 255 DI 10.1016/0375-9474(94)90804-4 PG 15 WC Physics, Nuclear SC Physics GA PL941 UT WOS:A1994PL94100015 ER PT J AU MASLOV, S PACZUSKI, M BAK, P AF MASLOV, S PACZUSKI, M BAK, P TI AVALANCHES AND 1/F NOISE IN EVOLUTION AND GROWTH-MODELS SO PHYSICAL REVIEW LETTERS LA English DT Article ID SELF-ORGANIZED CRITICALITY; DIRECTED PERCOLATION; DISORDERED MEDIUM; DYNAMICS AB We formally establish the relationship between spatial fractal behavior and long-range temporal correlations for a broad range of self-organized (and not self-organized) critical phenomena including directed percolation, interface depinning, and a simple evolution model. The recurrent activity at any particular site forms a fractal in time, with a power spectrum S(f) similar to 1/f((d) over bar) . The exponent (d) over tilde = to (D - d)/z, where d is the spatial dimension, D is the avalanche dimension, and z is the usual dynamical exponent. Theoretical results agree with numerical simulations. C1 SUNY STONY BROOK,DEPT PHYS,STONY BROOK,NY 11794. ISAAC NEWTON INST MATH SCI,CAMBRIDGE CB4 0EH,ENGLAND. RP MASLOV, S (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Maslov, Sergei/C-2397-2009 OI Maslov, Sergei/0000-0002-3701-492X NR 31 TC 95 Z9 98 U1 1 U2 10 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 17 PY 1994 VL 73 IS 16 BP 2162 EP 2165 DI 10.1103/PhysRevLett.73.2162 PG 4 WC Physics, Multidisciplinary SC Physics GA PM714 UT WOS:A1994PM71400005 ER PT J AU NAKAYA, T YAMANAKA, T ARISAKA, K ROBERTS, D SLATER, W WEAVER, M BRIERE, RA CHEU, E HARRIS, DA MCFARLAND, KS ROODMAN, A SCHWINGENHEUER, B SOMALWAR, SV WAH, YW WINSTEIN, B WINSTON, R BARKER, AR SWALLOW, EC BOCK, GJ COLEMAN, R CRISLER, M ENAGONIO, J FORD, R HSIUNG, YB JENSEN, DA RAMBERG, E TSCHIRHART, R COLLINS, EM GOLLIN, GD GU, P HAAS, P HOGAN, WP KIM, SK MATTHEWS, JN MYUNG, SS SCHNETZER, S THOMSON, GB ZOU, Y AF NAKAYA, T YAMANAKA, T ARISAKA, K ROBERTS, D SLATER, W WEAVER, M BRIERE, RA CHEU, E HARRIS, DA MCFARLAND, KS ROODMAN, A SCHWINGENHEUER, B SOMALWAR, SV WAH, YW WINSTEIN, B WINSTON, R BARKER, AR SWALLOW, EC BOCK, GJ COLEMAN, R CRISLER, M ENAGONIO, J FORD, R HSIUNG, YB JENSEN, DA RAMBERG, E TSCHIRHART, R COLLINS, EM GOLLIN, GD GU, P HAAS, P HOGAN, WP KIM, SK MATTHEWS, JN MYUNG, SS SCHNETZER, S THOMSON, GB ZOU, Y TI MEASUREMENT OF THE BRANCHING RATIO OF K-L-]E(+)E(-)GAMMAGAMMA SO PHYSICAL REVIEW LETTERS LA English DT Article AB A new measurement of the K-L --> e(+)e(-)gamma gamma branching ratio was carried out in Fermilab experiment E799. We observed 58 K-L --> e(+)e(-)gamma gamma events. The measured branching ratio is B(K-L --> e(+)e(-)gamma gamma, E(gamma)* > 5 MeV) = [6.5 +/- 1.2(stat) +/- 0.6(syst)] x 10(-7). C1 UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637. UNIV COLORADO,BOULDER,CO 80309. ELMHURST COLL,ELMHURST,IL 60126. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV ILLINOIS,URBANA,IL 61801. RUTGERS STATE UNIV,PISCATAWAY,NJ 08855. RP NAKAYA, T (reprint author), OSAKA UNIV,DEPT PHYS,TOYONAKA,OSAKA 560,JAPAN. RI Briere, Roy/N-7819-2014; Kim, Sun Kee/G-2042-2015 OI Briere, Roy/0000-0001-5229-1039; Kim, Sun Kee/0000-0002-0013-0775 NR 7 TC 11 Z9 11 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 17 PY 1994 VL 73 IS 16 BP 2169 EP 2172 DI 10.1103/PhysRevLett.73.2169 PG 4 WC Physics, Multidisciplinary SC Physics GA PM714 UT WOS:A1994PM71400007 ER PT J AU MAJESKI, R PHILLIPS, CK WILSON, JR AF MAJESKI, R PHILLIPS, CK WILSON, JR TI ELECTRON HEATING AND CURRENT DRIVE BY MODE CONVERTED SLOW WAVES SO PHYSICAL REVIEW LETTERS LA English DT Article ID ION HYBRID RESONANCES; ALFVEN RESONANCE; CYCLOTRON; CONVERSION; TOKAMAKS; PLASMAS AB An approach to obtaining efficient single-pass-mode conversion at high parallel wave number from the fast magnetosonic wave to the slow ion Bernstein wave, in a two-ion species tokamak plasma, is described. The intent is to produce localized electron heating or current drive via the mode-converted slow wave. In particular, this technique can be adapted to off-axis current drive for current profile control. Modeling for the case of deuterium-tritium plasmas in TFTR is presented. RP MAJESKI, R (reprint author), PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 15 TC 70 Z9 70 U1 2 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 17 PY 1994 VL 73 IS 16 BP 2204 EP 2207 DI 10.1103/PhysRevLett.73.2204 PG 4 WC Physics, Multidisciplinary SC Physics GA PM714 UT WOS:A1994PM71400016 ER PT J AU SIMMONS, JA LYO, SK HARFF, NE KLEM, JF AF SIMMONS, JA LYO, SK HARFF, NE KLEM, JF TI CONDUCTANCE MODULATION IN DOUBLE-QUANTUM WELLS DUE TO MAGNETIC-FIELD-INDUCED ANTICROSSING SO PHYSICAL REVIEW LETTERS LA English DT Article ID FERMI-SURFACE AB We observe a strong modulation of the low temperature in-plane conductance G(parallel to) of coupled quantum wells (QW's) by an in-plane magnetic field Bit and attribute this to an anticrossing of the two QW dispersion curves. The anticrossing produces a partial energy gap, yielding large, B-parallel to-tunable distortions in the Fermi surface and density of states. Sweeping B-parallel to moves the energy gap through the Fermi level, with the upper and lower gap edges producing a sharp maximum and minimum in G(parallel to), in agreement with theoretical calculations. The gap energy is directly determined from the data. C1 OREGON STATE UNIV,CORVALLIS,OR 97331. RP SIMMONS, JA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 15 TC 98 Z9 98 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 17 PY 1994 VL 73 IS 16 BP 2256 EP 2259 DI 10.1103/PhysRevLett.73.2256 PG 4 WC Physics, Multidisciplinary SC Physics GA PM714 UT WOS:A1994PM71400029 ER PT J AU SEIDLER, GT ROSENBAUM, TF CRABTREE, GW AF SEIDLER, GT ROSENBAUM, TF CRABTREE, GW TI VANISHING MAGNETIZATION RELAXATION IN THE HIGH-FIELD QUANTUM LIMIT IN YBA2CU3O7-DELTA - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Note C1 UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP SEIDLER, GT (reprint author), NEC RES INST,PRINCETON,NJ 08540, USA. RI Seidler, Gerald/I-6974-2012 NR 7 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 17 PY 1994 VL 73 IS 16 BP 2276 EP 2276 DI 10.1103/PhysRevLett.73.2276 PG 1 WC Physics, Multidisciplinary SC Physics GA PM714 UT WOS:A1994PM71400035 ER PT J AU BERMAN, GP DOOLEN, GD HOLM, DD TSIFRINOVICH, VI AF BERMAN, GP DOOLEN, GD HOLM, DD TSIFRINOVICH, VI TI QUANTUM COMPUTER ON A CLASS OF ONE-DIMENSIONAL ISING SYSTEMS SO PHYSICS LETTERS A LA English DT Article ID MAGNETIC-FIELDS; CHAINS; LOGIC AB We discuss the problem of designing a quantum computer based on one-dimensional ''alternating'' Ising systems (linear chains with periodically recurring spin groups) in an external magnetic field which exceeds the interaction between spins. Loading and processing of information in the alternating Ising system may be accomplished by using a scheme suggested recently by Lloyd for heteropolymer systems. The detailed operation of a simple quantum logical device is described in the framework of a binary Ising system. Estimates of physical parameters are presented that show that the experimental realization of such quantum computer elements would be feasible as a research task. However, many difficulties remain to be addressed, before the approach discussed here would be applicable in real devices. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. KRASNOYARSK STATE UNIV,TECH UNIV,RES & EDUC CTR NONLINEAR PROC,KIRENSKY INST PHYS,DEPT THEORET,KRASNOYARSK 660036,RUSSIA. POLYTECH INST NEW YORK,DEPT PHYS,CTR METROTECH 6,BROOKLYN,NY 11201. RP BERMAN, GP (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,MS-B258,LOS ALAMOS,NM 87545, USA. OI Holm, Darryl D/0000-0001-6362-9912 NR 27 TC 50 Z9 50 U1 0 U2 3 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 OCT 17 PY 1994 VL 193 IS 5-6 BP 444 EP 450 DI 10.1016/0375-9601(94)90537-1 PG 7 WC Physics, Multidisciplinary SC Physics GA PL628 UT WOS:A1994PL62800005 ER PT J AU FEIBELMAN, PJ AF FEIBELMAN, PJ TI PREPARATION IS THE KEY TO SUCCESS IN EMPLOYMENT INTERVIEWS .2. SO SCIENTIST LA English DT Editorial Material AB In the second installment of a three-part excerpt from his book A Ph.D. Is Not Enough!, physicist Peter J. Feibelman advises those interviewing for a job to look at the situation from the prospective employer's viewpoint and prepare accordingly. RP FEIBELMAN, PJ (reprint author), SANDIA NATL LABS,TECH STAFF,ALBUQUERQUE,NM 87185, USA. NR 1 TC 0 Z9 0 U1 1 U2 4 PU SCIENTIST INC PI PHILADELPHIA PA 3600 MARKET ST SUITE 450, PHILADELPHIA, PA 19104 SN 0890-3670 J9 SCIENTIST JI Scientist PD OCT 17 PY 1994 VL 8 IS 20 BP 23 EP 24 PG 2 WC Information Science & Library Science; Multidisciplinary Sciences SC Information Science & Library Science; Science & Technology - Other Topics GA PL332 UT WOS:A1994PL33200016 ER PT J AU WYROBEK, AJ ROBBINS, WA MEHRAEIN, Y PINKEL, D WEIER, HU AF WYROBEK, AJ ROBBINS, WA MEHRAEIN, Y PINKEL, D WEIER, HU TI DETECTION OF SEX CHROMOSOMAL ANEUPLOIDIES X-X, Y-Y, AND X-Y IN HUMAN SPERM USING 2-CHROMOSOME FLUORESCENCE IN-SITU HYBRIDIZATION SO AMERICAN JOURNAL OF MEDICAL GENETICS LA English DT Article DE ANEUPLOIDY; HUMAN; KLINEFELTER SYNDROME; SPERM; SEX RATIO; SEX CHROMOSOMES; X CHROMOSOME; Y CHROMOSOME; CHROMOSOMAL ABNORMALITY; FLUORESCENCE IN SITU HYBRIDIZATION (FISH) ID NONRADIOACTIVE INSITU HYBRIDIZATION; HUMAN-SPERMATOZOA; NUCLEI; PROBES; DNA; NONDISJUNCTION; FREQUENCY; BEARING; RATES AB Sex chromosome aneuploidy is the most common numerical chromosomal abnormality in humans at birth and a substantial portion of these abnormalities involve paternal chromosomes. An efficient method is presented for using air-dried smears of human semen to detect the number of X and Y chromosomes in sperm chromatin using two-chromosome fluorescence in situ hybridization. Air-dried semen smears were pre-treated with dithiothreitol and 3,4-diiodosalicylate salt to decondense the sperm chromatin and then were hybridized with repetitive sequence DNA probes that had been generated by PCR and differentially labeled. Hybridizations with X and Y specific probes showed the expected ratio of 50%X:50%Y bearing sperm. Sperm carrying extra fluorescence domains representing disomy for the X or Y chromosomes occurred at frequencies of similar to 4 per 10,000 sperm each. Cells carrying both X and Y fluorescence domains occurred at a frequency of similar to 6/10,000. Thus, the overall frequency of sperm that carried an extra sex chromosome was 1.4/1,000. The frequencies of sperm carrying sex chromosome aneuploidies determined by hybridization did not differ statistically from those reported from the same laboratory using the human-sperm/hamster-egg cytogenetic technique. Multi-chromosome fluorescence in situ hybridization to sperm is a promising method for assessing sex-ratio alterations in human semen and for determining the fraction of sperm carrying sex or other chromosome aneuploidies which may be transmissible to offspring. (C) 1994 Wiley-Liss, Inc. C1 UNIV CALIF BERKELEY,SCH PUBL HLTH,BERKELEY,CA 94720. UNIV CALIF SAN FRANCISCO,DEPT LAB MED,SAN FRANCISCO,CA 94143. UNIV MARBURG,INST HUMAN GENET,W-3550 MARBURG,GERMANY. RP WYROBEK, AJ (reprint author), LAWRENCE LIVERMORE NATL LAB,BIOL & BIOTECHNOL RES PROGRAM,L-452,7000 E AVE,LIVERMORE,CA 94550, USA. NR 44 TC 69 Z9 70 U1 0 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0148-7299 J9 AM J MED GENET JI Am. J. Med. Genet. PD OCT 15 PY 1994 VL 53 IS 1 BP 1 EP 7 DI 10.1002/ajmg.1320530102 PG 7 WC Genetics & Heredity SC Genetics & Heredity GA PK198 UT WOS:A1994PK19800001 PM 7802028 ER PT J AU VO-DINH, T HOUCK, K STOKES, DL AF VO-DINH, T HOUCK, K STOKES, DL TI SURFACE-ENHANCED RAMAN GENE PROBES SO ANALYTICAL CHEMISTRY LA English DT Article ID SCATTERING ANALYSIS; SPECTROMETRY; SPECTROSCOPY; SUBSTRATE; SENSOR AB We report for the first time a new type of DNA gene probe based on surface-enhanced Raman scattering (SERS) label detection. The surface-enhanced Raman gene (SERG) probes do not require the use of radioactive labels and have great potential to provide both sensitivity and selectivity. The SERG probe can be used to detect DNA biotargets (e.g., gene sequences, bacteria, viral DNA fragments) via hybridization to DNA sequences complementary to that probe. The analytical figures of merit and its applications in environmental and biomedical areas are discussed. RP VO-DINH, T (reprint author), OAK RIDGE NATL LAB, DIV HLTH SCI RES, ADV MONITORING DEV GRP, POB 2008, OAK RIDGE, TN 37831 USA. NR 22 TC 201 Z9 204 U1 6 U2 49 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD OCT 15 PY 1994 VL 66 IS 20 BP 3379 EP 3383 DI 10.1021/ac00092a014 PG 5 WC Chemistry, Analytical SC Chemistry GA PL230 UT WOS:A1994PL23000017 PM 7978314 ER PT J AU VANBERKEL, GJ ZHOU, FM AF VANBERKEL, GJ ZHOU, FM TI CHEMICAL ELECTRON-TRANSFER REACTIONS IN ELECTROSPRAY MASS-SPECTROMETRY - EFFECTIVE OXIDATION POTENTIALS OF ELECTRON-TRANSFER REAGENTS IN METHYLENE-CHLORIDE SO ANALYTICAL CHEMISTRY LA English DT Article ID CAROTENOID CATION RADICALS; ION TRAP; PARAMAGNETIC RESONANCE; IONIZATION; BIOMOLECULES; SPECTRA; PORPHYRINS; CHEMISTRY; MECHANISM; DICATIONS AB Cyclic voltammetry (CV), UV/visible absorption spectroscopy, and electrospray mass spectrometry (ES-MS) are used in conjunction to study the mono- and/or dications produced in solution from the reaction of three model compounds (beta-carotene, cobalt(II) octaethylporphyrin (Co(II)OEP), nickel(II) octaethylporphyrin (Ni(II)OEP)), in three different solvent/electron-transfer reagent systems (methylene chloride/0.1% trifluoroacetic acid (TFA) (v/v), methylene chloride/0.1% TFA/2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) (v/v/200 mu M), methylene chloride/0.1% TFA/0.1% antimony pentafluoride (SbF5) (v/v/v)). The reactions were carried out on-line with ES-MS by means of flow injection. Correlation of the CV data for these analytes with the ionic species determined to be in the solution on the basis of UV/visible absorption spectra and/or on the basis of the ionic species observed in the gas phase by ES-MS, along with our previously published data on these solvent/reagent systems, allowed an effective oxidation potential range, E, to be assigned to these solvent/reagent systems: methylene chloride/0.1% TFA (v/v), 0.6 V less than or equal to E(TFA) < 0.7 V; methylene chloride/0.1% TFA/ DDQ (v/v/200 mu M), 0.8 V less than or equal to E(TFA/DDQ) < 1.0 V; methylene chloride/0.1% TFA/0.1% SbF5 (v/v/v), 1.3 less than or equal to E(TFA/SbF5) < 1.5. Knowledge of the solvent/reagent oxidation potentials and the electrochemical redox potentials of a particular analyte of interest allows a solvent/reagent system to be chosen to selectively ionize an analyte, or a range of analytes, to a desired ionic state for subsequent analysis by ES-MS. The ability to detect, in the gas phase, an ionic species produced in solution by chemical electron transfer will depend, however, on the stability of the ion in the given solvent/reagent system and on whether the ion can survive intact the transfer to the gas phase via the ES process. RP VANBERKEL, GJ (reprint author), OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831, USA. NR 40 TC 50 Z9 50 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD OCT 15 PY 1994 VL 66 IS 20 BP 3408 EP 3415 DI 10.1021/ac00092a018 PG 8 WC Chemistry, Analytical SC Chemistry GA PL230 UT WOS:A1994PL23000021 ER PT J AU DOKTYCZ, MJ HABIBIGOUDARZI, S MCLUCKEY, SA AF DOKTYCZ, MJ HABIBIGOUDARZI, S MCLUCKEY, SA TI ACCUMULATION AND STORAGE OF IONIZED DUPLEX DNA-MOLECULES IN A QUADRUPOLE ION-TRAP SO ANALYTICAL CHEMISTRY LA English DT Article ID IONIZATION MASS-SPECTROMETRY; ASSISTED LASER DESORPTION; ELECTROSPRAY-IONIZATION; NONCOVALENT INTERACTIONS; OLIGONUCLEOTIDE DUPLEX; HIGH-RESOLUTION; CYTOCHROME-C; MYOGLOBIN; COMPLEXES; PROTEINS AB Evidence for the accumulation and storage of ionized duplex DNA molecules in a quadrupole ion trap is presented. Aqueous solutions of complementary single-strand molecules of DNA were annealed to form duplexes in solution and subjected to electrospray ionization. The ions liberated in this process were transported through an atmosphere/vacuum interface and injected into a quadrupole ion trap operated with a bath gas present at a pressure of 1 mTorr. Despite the roughly 2 order of magnitude poorer signal levels noted for electrospray of aqueous solutions relative to those observed for single-strand oligonucleotides in methanol solutions, aqueous solutions were used to avoid denaturing the duplexes. Ion trap mass spectra are reported here for duplexes consisting of two complementary 20-mer single strands and two complementary 10-mers. Tandem mass spectrometry results are also reported for the 10-mer duplex. These results are significant in that they indicate that the ions are kinetically stable under the ion injection, storage, and mass analysis conditions of the quadrupole ion trap operated with a relatively high pressure of bath gas. The tools of ion trap mass spectrometry can therefore be applied to this important class of compounds. C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. RI McLuckey, Scott/B-2203-2009; Doktycz, Mitchel/A-7499-2011 OI McLuckey, Scott/0000-0002-1648-5570; Doktycz, Mitchel/0000-0003-4856-8343 FU NIGMS NIH HHS [GM45372] NR 49 TC 50 Z9 51 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD OCT 15 PY 1994 VL 66 IS 20 BP 3416 EP 3422 DI 10.1021/ac00092a019 PG 7 WC Chemistry, Analytical SC Chemistry GA PL230 UT WOS:A1994PL23000022 PM 7978315 ER PT J AU DALE, JM YANG, M WHITTEN, WB RAMSEY, JM AF DALE, JM YANG, M WHITTEN, WB RAMSEY, JM TI CHEMICAL CHARACTERIZATION OF SINGLE PARTICLES BY LASER ABLATION/DESORPTION IN A QUADRUPOLE ION-TRAP MASS-SPECTROMETER SO ANALYTICAL CHEMISTRY LA English DT Article ID DESORPTION; IONIZATION; ONLINE AB Particles are introduced into the center of the space surrounded by the hyperbolic electrode surfaces of a quadrupole ion trap mass spectrometer. Ions are desorbed or ablated from the surfaces of the particles with laser pulses from a Nd:YAG laser as the particles fall through the trap. The ions are trapped and subsequently mass analyzed using the mass-selective instability mode of operation of the ion trap. Desorption experiments were performed with similar to 100 mu m silicon carbide particles with an average of a few nanograms of adsorbed trimethylphenylammonium chloride, tetraphenylphosphonium bromide, or 2,4,6-trinitrotoluene per particle. A conservative detection limit of 0.7 fm per particle was determined for tetraphenylphosphonium bromide. Ablation experiments were performed with similar to 50 mu m nickel particles for isotope ratio measurements with good agreement between accepted and average experimental values. RP DALE, JM (reprint author), OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831, USA. NR 22 TC 30 Z9 31 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD OCT 15 PY 1994 VL 66 IS 20 BP 3431 EP 3435 DI 10.1021/ac00092a021 PG 5 WC Chemistry, Analytical SC Chemistry GA PL230 UT WOS:A1994PL23000024 ER PT J AU JACOBSON, SC KOUTNY, LB HERGENRODER, R MOORE, AW RAMSEY, JM AF JACOBSON, SC KOUTNY, LB HERGENRODER, R MOORE, AW RAMSEY, JM TI MICROCHIP CAPILLARY ELECTROPHORESIS WITH AN INTEGRATED POSTCOLUMN REACTOR SO ANALYTICAL CHEMISTRY LA English DT Article ID ZONE ELECTROPHORESIS; FLUORESCENCE DETECTION; ORTHO-PHTHALDIALDEHYDE; SAMPLE INJECTION; AMINO-ACIDS; CHIP; TECHNOLOGY; SYSTEMS AB A glass microchip with a postcolumn reactor was fabricated to conduct postseparation derivatization using o-phthaldialdehyde as a fluorescent ''tag'' for amino acids. This miniaturized separation device was constructed using standard photolithographic, wet chemical etching, and bonding techniques. Effects of the reagent stream on separation efficiency were investigated. In addition, a novel gated injector was demonstrated which maintains the integrity of the analyte, buffer, and reagent streams. C1 OAK RIDGE NATL LAB,DIV CHEM & ANALYT SCI,OAK RIDGE,TN 37831. NR 22 TC 354 Z9 359 U1 1 U2 40 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD OCT 15 PY 1994 VL 66 IS 20 BP 3472 EP 3476 DI 10.1021/ac00092a027 PG 5 WC Chemistry, Analytical SC Chemistry GA PL230 UT WOS:A1994PL23000030 ER PT J AU MELNICK, RL SILLS, RC ROYCROFT, JH CHOU, BJ RAGAN, HA MILLER, RA AF MELNICK, RL SILLS, RC ROYCROFT, JH CHOU, BJ RAGAN, HA MILLER, RA TI ISOPRENE, AN ENDOGENOUS HYDROCARBON AND INDUSTRIAL-CHEMICAL, INDUCES MULTIPLE ORGAN NEOPLASIA IN RODENTS AFTER 26 WEEKS OF INHALATION EXPOSURE SO CANCER RESEARCH LA English DT Article ID HEPATIC-MICROSOMAL METABOLISM; NATIONAL TOXICOLOGY PROGRAM; B6C3F1 MICE; SPECIES-DIFFERENCES; 1,3-BUTADIENE; CARCINOGENICITY; BUTADIENE; RATS; PHARMACOKINETICS; MORTALITY AB Isoprene, the 2-methyl analogue of 1,3-butadiene, is a high production chemical used largely in the manufacture of synthetic rubber and is the major endogenous hydrocarbon exhaled in human breath. Thirteen-week inhalation toxicology studies of isoprene were conducted in male and female F344 rats and B6C3F(1) mice at exposure concentrations of 0, 70, 220, 700, 2200, and 7000 ppm (6 h/day; 5 days/week). In addition, 26-week inhalation studies at the same exposure levels, followed by a 26-week recovery period, were conducted in male rats and mice. The 13-week exposures produced no discernible exposure-related toxic effects in rats. Interstitial cell hyperplasia of the testis was observed in all male rats in the 7000 ppm group after 26 weeks of exposure; following the 26-week recovery period the only effect in rats was a marginal increase in benign testicular interstitial cell tumors. In mice, isoprene induced toxic and carcinogenic effects at multiple organ sites. Following the 26-week exposure and 26-week recovery periods, incidences of neoplastic lesions in the liver, lung, forestomach, and harderian gland were significantly increased. Neoplastic effects were observed at 700 ppm and higher exposures. Nonneoplastic lesions in mice exposed to isoprene included spinal cord degeneration, testicular atrophy, degeneration of the olfactory epithelium, and epithelial hyperplasia of the forestomach. A partial hindlimb paralysis and a nonresponsive macrocytic anemia were also seen in mice. Most of the toxic and carcinogenic effects caused by isoprene, as well as the species' difference in response, had been observed after inhalation exposures to 1,3-butadiene. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP MELNICK, RL (reprint author), NIEHS, ENVIRONM CARCINOGENESIS PROGRAM, POB 12233, RES TRIANGLE PK, NC 27709 USA. NR 47 TC 44 Z9 44 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 OCT 15 PY 1994 VL 54 IS 20 BP 5333 EP 5339 PG 7 WC Oncology SC Oncology GA PL558 UT WOS:A1994PL55800015 PM 7923161 ER PT J AU LEGANES, F AF LEGANES, F TI GENETIC-EVIDENCE THAT HEPA GENE IS INVOLVED IN THE NORMAL DEPOSITION OF THE ENVELOPE OF BOTH HETEROCYSTS AND AKINETES IN ANABAENA-VARIABILIS-ATCC-29413 SO FEMS MICROBIOLOGY LETTERS LA English DT Article DE AKINETE; HETEROCYST; HEPA; ANABAENA VARIABILIS ID SP-STRAIN PCC-7120; CYANOBACTERIUM; DIFFERENTIATION; POLYSACCHARIDES AB The hepA gene in Anabaena sp. strain PCC 7120 is required for normal formation of the polysaccharide layer of the heterocyst envelope. A plasmid bearing hepA, interrupted by a neomycin-resistance cassette, was transferred by conjugation to wild type Anabaena variabilis ATCC 29413, so that the interrupted hepA gene replaced a homologous sequence. In the recombinant exconjugants, the envelopes of akinetes as well as of heterocysts were altered. C1 MICHIGAN STATE UNIV,MSU,DOE,PLANT RES LAB,E LANSING,MI 48824. NR 24 TC 17 Z9 17 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-1097 J9 FEMS MICROBIOL LETT JI FEMS Microbiol. Lett. PD OCT 15 PY 1994 VL 123 IS 1-2 BP 63 EP 67 PG 5 WC Microbiology SC Microbiology GA PM231 UT WOS:A1994PM23100010 PM 7988900 ER PT J AU TSURUTANI, BT HO, CM SMITH, EJ NEUGEBAUER, M GOLDSTEIN, BE MOK, JS ARBALLO, JK BALOGH, A SOUTHWOOD, DJ FELDMAN, WC AF TSURUTANI, BT HO, CM SMITH, EJ NEUGEBAUER, M GOLDSTEIN, BE MOK, JS ARBALLO, JK BALOGH, A SOUTHWOOD, DJ FELDMAN, WC TI THE RELATIONSHIP BETWEEN INTERPLANETARY DISCONTINUITIES AND ALFVEN WAVES - ULYSSES OBSERVATIONS SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID SOLAR; STORMS AB The rate of occurrence of interplanetary discontinuities (ROID) is examined using Ulysses magnetic field and plasma data from 1 to 5 AU radial distance from the Sun and at high heliographic latitudes. We find two regions where the ROID is high: in stream-stream interaction regions and in Alfven wave trains. This latter feature is particularly obvious at high latitudes when Ulysses enters a high speed stream associated with a polar coronal hole. These streams are characterized by the presence of continuous, large-amplitude (DELTAB/\B\ approximately 1-2) Alfven waves and an extraordinarily high ROID value (approximately 150 discontinuities/day). In a number of intervals examined, it is found that (rotational) discontinuities are an integral part of the Alfven waves. The nonlinear Alfven waves are spherically polarized, i.e., the tip of the perturbation vector resides on the surface of a sphere (a consequence of constant \B\). The slowly rotating part of the waves rotates approximately 270-degrees in phase. There is a slight arc in the B1-B2 hodogram, suggesting an almost linear polarization. The phase rotation associated with the discontinuity is approximately 90-degrees, lies in the same plane as the slowly rotating part of the Alfven wave, and therefore completes the 360-degrees phase rotation. The best description of the overall Alfven wave plus discontinuity is a spherical, arc-polarized, phase-steepened wave. C1 UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP TSURUTANI, BT (reprint author), JET PROP LAB,4800 OAK GROVE DR,MAIL STOP 169 506,PASADENA,CA 91109, USA. NR 12 TC 103 Z9 107 U1 0 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD OCT 15 PY 1994 VL 21 IS 21 BP 2267 EP 2270 DI 10.1029/94GL02194 PG 4 WC Geosciences, Multidisciplinary SC Geology GA PN308 UT WOS:A1994PN30800002 ER PT J AU GOSLING, JT MCCOMAS, DJ PHILLIPS, JL WEISS, LA PIZZO, VJ GOLDSTEIN, BE FORSYTH, RJ AF GOSLING, JT MCCOMAS, DJ PHILLIPS, JL WEISS, LA PIZZO, VJ GOLDSTEIN, BE FORSYTH, RJ TI A NEW CLASS OF FORWARD-REVERSE SHOCK PAIRS IN THE SOLAR-WIND SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID COROTATING SHOCKS; PIONEER-10 AB A new class of forward-reverse shock pairs in the solar wind has been discovered using Ulysses observations at high heliographic latitudes. These shock pairs are produced by expansion of coronal mass ejections, CMEs, that have internal pressures that are higher than, and speeds that are comparable to, that of the surrounding solar wind plasma. Of six certain CMEs observed poleward of S31-degrees, three have associated shock pairs of this nature. We suggest that high internal CME pressures may exist primarily for events that have high speeds close to the surface of the Sun. C1 SAN JUAN INST,SAN JUAN CAPISTRANO,CA. NOAA,SEL,BOULDER,CO 80303. JET PROP LAB,PASADENA,CA 91109. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND. RP GOSLING, JT (reprint author), LOS ALAMOS NATL LAB,MS D466,LOS ALAMOS,NM 87545, USA. NR 15 TC 98 Z9 98 U1 0 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD OCT 15 PY 1994 VL 21 IS 21 BP 2271 EP 2274 DI 10.1029/94GL02245 PG 4 WC Geosciences, Multidisciplinary SC Geology GA PN308 UT WOS:A1994PN30800003 ER PT J AU CODERRE, JA BUTTON, TM MICCA, PL FISHER, CD NAWROCKY, MM LIU, HB AF CODERRE, JA BUTTON, TM MICCA, PL FISHER, CD NAWROCKY, MM LIU, HB TI NEUTRON-CAPTURE THERAPY OF THE 9L RAT GLIOSARCOMA USING THE P-BORONOPHENYLALANINE-FRUCTOSE COMPLEX SO INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS LA English DT Article DE BORONOPHENYLALANINE; FRUCTOSE COMPLEX; NEUTRON CAPTURE THERAPY; RAT BRAIN TUMOR; MAGNETIC RESONANCE IMAGING; THERAPEUTIC GAIN ID CENTRAL NERVOUS-SYSTEM; BRAIN TUMOR-MODEL; RADIATION-THERAPY; DOSE-RATE; BORON; MELANOMA; COMBINATION; DELIVERY; BCNU; MICE AB Purpose: Intraperitoneal(IP) injection of the solubilized fructose complex of L-p-boronophenylalanine (BPA-F) produced higher boron concentrations in a rat brain tumor model than was possible using intragastric (IG) administration of L-p-boronophenylalanine (BPA). The effectiveness of IP BPA-F was compared to IG BPA in boron neutron capture therapy irradiations of the 9L rat brain tumor model. Methods and Materials: The time course of boron accumulation in tumor and normal tissues was determined in male F344 rats bearing either SC or intracerebral 9L gliosarcomas following a single IP injection of BPA-F. On day 14 after inoculation of intracranial tumors, rats were irradiated with single doses of either: 250 kVp X rays; the thermal neutron beam of the Brookhaven Medical Research Reactor following IG administration of BPA; or thermal neutrons following IP injection of BPA-F. Magnetic resonance imaging was used to visualize the tumor scars and to assess damage to the normal brain in long-term survivors. Results: 4 h after IP injection of 1200 mg/kg of BPA-F the boron concentrations in tumor, blood, and normal brain were 89.6 +/- 7.6, 27.7 +/- 2.8 and 17.5 +/- 1.5 mu g B-10/g, respectively. Two IG doses of BPA (750 mg/kg each, 3 h apart) produced 39 +/- 5, 12 +/- 1 and 10 +/- 1 mu g(10)B/g in tumor, blood and brain, respectively at 5 h after the second dose. Three groups of rats were treated with thermal neutrons: one following IC BPA and two groups following IP BPA-F. The total physical absorbed doses to the tumor in the three BNCT groups were 15.5 Gy (IG BPA, n = 12), 17.0 Gy (IP BPA-F, n = 8), and 31.5 Gy (IP BPA-F, n = 8), respectively. The median survival of the untreated controls was 22 days. The median survival of the rats treated with 22.5 Gy of 250 kVp X rays (n = 23) was 35 days with 20% long-term survivors. Fifty percent of the rats in the IG BPA + thermal neutrons group survived over 1 year. All rats in both groups that received IP BPA-F + thermal neutrons have survived over 8 months. Magnetic resonance imaging of the brains of the long-term boron neutron capture therapy survivors showed a scar at the site of tumor implantation in all animals. In the IP BPA-F high-dose group one rat showed evidence of edema and one rat showed a fluid-filled cyst replacing the tumor. Conclusion: The use of IP BPA-F has significantly improved long-term survival compared to IG BPA. The high percentage of long-term tumor control (100%, n = 16) in the intracerebral rat 9L gliosarcoma brain tumor model, together with little or no damage to the surrounding normal brain in the majority of surviving animals, demonstrate the substantial therapeutic gain produced by boron neutron capture therapy. C1 SUNY STONY BROOK,DEPT RADIOL,STONY BROOK,NY 11790. RP CODERRE, JA (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. NR 41 TC 108 Z9 110 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-3016 J9 INT J RADIAT ONCOL JI Int. J. Radiat. Oncol. Biol. Phys. PD OCT 15 PY 1994 VL 30 IS 3 BP 643 EP 652 PG 10 WC Oncology; Radiology, Nuclear Medicine & Medical Imaging SC Oncology; Radiology, Nuclear Medicine & Medical Imaging GA PK604 UT WOS:A1994PK60400015 PM 7928496 ER PT J AU DAVIS, JW PITCHER, CS HAASZ, AA AF DAVIS, JW PITCHER, CS HAASZ, AA TI REEMISSION OF DEUTERIUM FROM GRAPHITE AS A FUNCTION OF D+ FLUX-DENSITY SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID IMPLANTED DEUTERIUM; DYNAMIC INVENTORY; HYDROGEN; DEPENDENCE; H+ AB An experiment was performed in order to determine whether a first-order or second-order mechanism governs the re-emission of deuterium molecules from graphite during D+ bombardment. The order of the release mechanism should be reflected in the dependence of the re-emission on the incident flux density. No flux density dependence was observed, indicating a first-order process, in agreement with a hydrogen transport model where the rate of molecule release is determined by a first-order process involving H diffusion within graphite crystallites. C1 CANADIAN FUS FUELS TECHNOL PROJECT,MISSISSAUGA L5J 1K3,ON,CANADA. PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08540. RP DAVIS, JW (reprint author), UNIV TORONTO,INST AEROSP STUDIES,FUS RES GRP,4925 DUFFERING ST,N YORK M3H 5T6,ON,CANADA. NR 16 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 15 PY 1994 VL 76 IS 8 BP 4511 EP 4515 DI 10.1063/1.357282 PG 5 WC Physics, Applied SC Physics GA PM731 UT WOS:A1994PM73100006 ER PT J AU ROBINSON, HG HAYNES, TE ALLEN, EL LEE, CC DEAL, MD JONES, KS AF ROBINSON, HG HAYNES, TE ALLEN, EL LEE, CC DEAL, MD JONES, KS TI EFFECT OF IMPLANT TEMPERATURE ON DOPANT DIFFUSION AND DEFECT MORPHOLOGY FOR SI IMPLANTED GAAS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID GALLIUM-ARSENIDE; SPUTTERING YIELD; DEPENDENCE; GE; SILICON; TARGETS AB Experimental observations of dopant diffusion and defect formation are reported as a function of implant temperature in Si implanted GaAs. The diffusion of Si during post-implant annealing decreases by a factor of 2.5 as the implant temperature increases from -2 to 40-degrees-C. In this same temperature range, the maximum depth and density of extrinsic dislocation loops increase by factors of 3 and 4, respectively. Rutherford backscattering channeling measurements indicate that Si implanted GaAs undergoes an amorphous to crystalline transition at Si implant temperatures between -51 and 40-degrees-C. A unified explanation of the effects of implant temperature of both diffusion and dislocation formation is proposed based on the known differences in sputter yields between crystalline and amorphous semiconductors. The model assumes that the sputter yield is enhancedd by amorphization in the lower temperatures, thus increasing the excess vacancy concentration. Estimates of excess vacancy concentration are obtained by simulations of the diffusion profiles and are quantitatively consistent with a realistic sputter yield enhancement. C1 UNIV FLORIDA,DEPT MAT SCI & ENGN,GAINESVILLE,FL 32611. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. SAN JOSE STATE UNIV,DEPT MAT ENGN,SAN JOSE,CA 95192. STANFORD UNIV,DEPT MAT SCI,STANFORD,CA 94305. RP ROBINSON, HG (reprint author), STANFORD UNIV,DEPT ELECT ENGN,SOLID STATE ELECTR LAB,STANFORD,CA 94305, USA. RI Haynes, Tony/P-8932-2015 OI Haynes, Tony/0000-0003-2871-4745 NR 19 TC 9 Z9 9 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 15 PY 1994 VL 76 IS 8 BP 4571 EP 4575 DI 10.1063/1.357290 PG 5 WC Physics, Applied SC Physics GA PM731 UT WOS:A1994PM73100015 ER PT J AU DERHACOBIAN, N WALTON, JT LUKE, PN WONG, YK ROSSINGTON, CS AF DERHACOBIAN, N WALTON, JT LUKE, PN WONG, YK ROSSINGTON, CS TI PROPER INTERPRETATION OF PHOTOCONDUCTIVE DECAY TRANSIENTS IN SEMICONDUCTORS HAVING FINITE SURFACE RECOMBINATION VELOCITY SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ROOM-TEMPERATURE; BULK LIFETIME; SILICON-WAFER; ABSORPTION; GROWTH; OXIDE; AIR AB The influence of finite surface recombination velocity on the proper interpretation of photoconductive decay (PCD) transients in semiconductors is discussed. The limitations of simple analytical equations which relate the observed effective lifetime to the material parameters are considered. It is shown that, under most circumstances, the correct application of the appropriate analytical expression requires some prior knowledge of the material parameters under investigation. several methods are proposed to extract useful information from PCD experiments. Finally, the practicality of these methods is investigated by measuring the effective lifetimes of high-purity germanium and float-zone silicon using a noncontact PCD technique. RP DERHACOBIAN, N (reprint author), LAWRENCE BERKELEY LAB,DIV ENGN,BERKELEY,CA 94720, USA. NR 18 TC 4 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 15 PY 1994 VL 76 IS 8 BP 4663 EP 4669 DI 10.1063/1.357304 PG 7 WC Physics, Applied SC Physics GA PM731 UT WOS:A1994PM73100029 ER PT J AU SKOFRONICK, GL CARIM, AH FOLTYN, SR MUENSCHAUSEN, RE AF SKOFRONICK, GL CARIM, AH FOLTYN, SR MUENSCHAUSEN, RE TI ORIENTATION OF YBA2CU3O7-X FILMS ON UNBUFFERED AND CEO2-BUFFERED YTTRIA-STABILIZED ZIRCONIA SUBSTRATES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SUPERCONDUCTING THIN-FILMS; MICROSTRUCTURE; DEPOSITION; TEMPERATURE; DEPENDENCE; BOUNDARIES; INTERFACE AB YBa2Cu3O7-x (YBCO) films deposited by pulsed laser ablation on unbuffered and CeO2-buffered yttria-stabilized zirconia (YSZ) substrates were studied by x-ray diffraction and transmission electron microscopy to investigate film orientation. From phi scans it was determined that the unbuffered films possess two major in-plane orientation relationships with the substrate. Both have (001)YBCO parallel-to (001)YSZ, with either [100]YBCO parallel-to [100]YSZ or [110]YBCO parallel-to [100]YSZ, a 0-degree or 45-degrees orientation, respectively. As deposition temperature increases, satellite peaks that straddle the 0-degree or 45-degrees orientations develop. The SIGMA boundary and near coincident site lattice descriptions are applied to the discussion of these misorientations. In general the CeO2-buffered YBCO films align with to the 45-degrees orientation to the CeO2 buffer layer. Out-of-plane film orientation was investigated for both unbuffered and CeO2-buffered YBCO films and expressed as a ratio of the amount of c perpendicular-to material to a perpendicular-to material. Buffered films exhibited c perpendicular-to material to a perpendicular-to material ratios approximately twice those of unbuffered films. Transmission electron microscopy combined with the x-ray data was used to develop an explanation for the trends in the variation of the c perpendicular-to/a perpendicular-to ratio with film deposition temperature. C1 PENN STATE UNIV,DEPT MAT SCI & ENGN,UNIVERSITY PK,PA 16802. LOS ALAMOS NATL LAB,CTR SUPERCOND TECHNOL,LOS ALAMOS,NM 87545. NR 22 TC 7 Z9 7 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 15 PY 1994 VL 76 IS 8 BP 4753 EP 4760 DI 10.1063/1.357245 PG 8 WC Physics, Applied SC Physics GA PM731 UT WOS:A1994PM73100044 ER PT J AU LOZYKOWSKI, HJ ALSHAWA, AK BROWN, J AF LOZYKOWSKI, HJ ALSHAWA, AK BROWN, J TI KINETICS AND QUENCHING MECHANISMS OF PHOTOLUMINESCENCE IN YB-DOPED INP SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID INDIUM-PHOSPHIDE; DECAY MECHANISMS; LUMINESCENCE; EXCITATION; FE; SEMICONDUCTORS; SPECTROSCOPY; YB-3+; ION; YTTERBIUM AB The photoluminescence spectra of Yb-implanted InP samples were studied under pulsed and cw excitations using an Ar+-ion laser (above band-gap excitation) at different temperatures and excitation intensities. The photoluminescence spectrum of the 4f transitions F-2(5/2)-F-2(7/2) consists of a sharp peak at 1001 nm and broader peaks in the spectral range between 1002.5 and 1010 nm. Time-resolved spectra were recorded at different temperatures. Using a tunable Ti:sapphire laser (above and below band-gap excitation) the photoluminescence excitation spectra were investigated for different emission lines. Study of the rise and decay time under intrinsic excitation (band to band) show that the rise time is a function of excitation intensity, which reflects an indirect excitation process for Yb3+. The experimental data are explained using a kinetics model of energy transfer from the host lattice to the localized core excited states of rare-earth isoelectronic structured traps. The numerically simulated luminescence rise and decay times show a good general quantitative agreement with experimental data, over a wide range of generation rates. The photoluminescence spectra and decay time were also studied as a function of temperature. A quenching mechanism of ytterbium luminescence involving Yb and Fe ions is proposed. Finally, the electric-field quenching of InP:Yb photoluminescence is investigated. C1 OHIO UNIV,CONDENSED MATTER & SURFACE SCI PROGRAM,ATHENS,OH 45701. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP LOZYKOWSKI, HJ (reprint author), OHIO UNIV,DEPT ELECT & COMP ENGN,ATHENS,OH 45701, USA. NR 33 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 15 PY 1994 VL 76 IS 8 BP 4836 EP 4846 DI 10.1063/1.357257 PG 11 WC Physics, Applied SC Physics GA PM731 UT WOS:A1994PM73100057 ER PT J AU ZHAO, YX YOURSHAW, I REISER, G ARNOLD, CC NEUMARK, DM AF ZHAO, YX YOURSHAW, I REISER, G ARNOLD, CC NEUMARK, DM TI STUDY OF THE ARBR-, ARI-, AND KRI- ANIONS AND THE CORRESPONDING NEUTRAL VAN-DER-WAALS COMPLEXES BY ANION ZERO ELECTRON KINETIC-ENERGY SPECTROSCOPY SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID NOBLE-GAS HALIDES; LOWEST EXCITED-STATES; CROSSED MOLECULAR-BEAM; THRESHOLD PHOTODETACHMENT SPECTROSCOPY; BOUND-FREE EMISSION; CLOSED-SHELL ATOMS; ION-RARE-GAS; INTERACTION POTENTIALS; PHOTOELECTRON-SPECTROSCOPY; DIATOMIC-MOLECULES AB Three rare gas halide (RgX(-)) anions, ArBr-, ArI-, and KrI-, der Waals complexes, ArBr, ArI, and KrI, were studied with anion zero electron kinetic energy (ZEKE) spectroscopy. Photodetachment of each anion accesses the three lowest-lying electronic states (the X1/2, I3/2, and II1/2 states) of the neutral complex. The spectra for each system reveal well-resolved progressions in the low frequency vibrations of the anion and the three neutral electronic states, providing a detailed spectroscopic probe of the Rg.X(-) and Rg.X interaction potentials. The line shapes observed in the ZEKE spectra are analyzed in terms of the line strengths of the underlying rotational transitions. From our data, we construct the potential energy curve for each neutral state as well as for the anion, and these interaction potentials are compared to potentials obtained from scattering and ion mobility experiments. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP ZHAO, YX (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. RI Neumark, Daniel/B-9551-2009 OI Neumark, Daniel/0000-0002-3762-9473 NR 83 TC 123 Z9 123 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 15 PY 1994 VL 101 IS 8 BP 6538 EP 6551 DI 10.1063/1.468500 PG 14 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PL716 UT WOS:A1994PL71600017 ER PT J AU CHRISTOPHOROU, LG DATSKOS, PG FAIDAS, H AF CHRISTOPHOROU, LG DATSKOS, PG FAIDAS, H TI PHOTODETACHMENT IN THE GASEOUS, LIQUID, AND SOLID STATES OF MATTER SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID NONDISSOCIATIVE ELECTRON-ATTACHMENT; MOLECULAR NEGATIVE-IONS; TEMPORARY ANION STATES; NON-POLAR LIQUIDS; TRANSMISSION SPECTROSCOPY; LASER PHOTODETACHMENT; INVERSE PHOTOEMISSION; AROMATIC-HYDROCARBONS; RATE CONSTANTS; PERFLUOROBENZENE AB We have made absolute cross section measurements of laser photodetachment of C6F6- ions embedded in gaseous tetramethylsilane (TMS) and compared the results at low gas densities with measurements in nonpolar liquids and solids. The measurements indicate that the photodetachment cross section of C6F6- in gaseous TMS is about three times larger than in liquid TMS. This is rationalized by considering the effect of the medium on both the photoabsorption and the autodetachment processes. The photodetachment cross section in both the gas and the liquid exhibits (at least) two maxima due to autodetaching negative ion states. It is argued that these are due to sigma*-->sigma* transitions in C6F6-. The relative positions of these ''superexcited'' anionic states did not change appreciably in going from the gas to the liquid and the solid, indicating similar influences of the medium on them. As expected, the photodetachment threshold in the condensed phase is shifted to higher energies compared to the gaseous phase. This shift is consistent with recent photoelectron studies of photodetachment of C6F6- clusters. The present study clearly shows that the photodetachment from negative ions embedded in all states of matter proceeds directly or indirectly via negative ion autodetaching states, and that for nonpolar media, the effect of the medium can be accounted for by considering the macroscopic properties of the medium described by its dielectric constant epsilon and refractive index n. C1 UNIV TENNESSEE, DEPT PHYS, KNOXVILLE, TN 37996 USA. RP CHRISTOPHOROU, LG (reprint author), OAK RIDGE NATL LAB, DIV HLTH SCI RES, ATOM MOLEC & HIGH VOLTAGE PHYS GRP, POB 2008, OAK RIDGE, TN 37831 USA. NR 81 TC 23 Z9 23 U1 0 U2 3 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 15 PY 1994 VL 101 IS 8 BP 6728 EP 6742 DI 10.1063/1.468365 PG 15 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PL716 UT WOS:A1994PL71600037 ER PT J AU POLLARD, ML RADKE, CJ AF POLLARD, ML RADKE, CJ TI DENSITY-FUNCTIONAL MODELING OF STRUCTURE AND FORCES IN THIN MICELLAR LIQUID-FILMS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ANIONIC SURFACTANT SOLUTIONS; ELASTIC LIGHT-SCATTERING; SODIUM DODECYL-SULFATE; DOUBLE-LAYER FORCES; SOLVATION FORCES; FOAM FILMS; INTERMICELLAR INTERACTIONS; ELECTROSTATIC INTERACTION; ELECTROLYTE SOLUTIONS; COLLOIDAL SYSTEMS AB Recent equilibrium force measurements on aqueous films of surfactant above the critical micelle concentration show oscillations for film thicknesses up to 50 nm. To model this phenomenon we express the micellar contribution to the disjoining pressure in terms of thickness-dependent inhomogenous micelle number density distributions through the film. Density functional theory is used to calculate micelle density profiles, presuming the micelles to behave as charged spheres interacting with each other, and with the film interfaces, through screened-Coulomb potentials. The background electrolyte permits dilute micellar solutions to act as concentrated systems exhibiting pronounced layering in the film. for a 0.1 M sodium dodecylsulfate (SDS) film we find up to five micellar layers for a film thickness equal to ten micelle diameters (d), the layer separation scaling with the effective diameter (d(eff)/d=1.86) which includes the micelle Debye atmosphere. The peaks are largest near the interfaces and decay toward the bulk density at the film midplane. The corresponding disjoining pressure show oscillations with the same distance scaling between the branches as in the density profile; these values are consistent with experiment. With decreasing film thickness, the (meta-)stable disjoining pressure regions represent micellar layers in the film being forced closer together, raising the pressure until the interior layer is expelled, allowing more space between the remaining layers at that thickness. Repulsive (positive) disjoining pressures result from layer separations less than the corresponding bulk value whereas attractive (negative) regions represent more distance between layers than that in the bulk. The 0.2 M SDS disjoining pressure isotherm exhibits one additional layer than the 0.1 M case for thicknesses up to 50 nm. The pressure magnitudes of the former case are about twice that of the latter. Addition of ionic salts greatly inhibits the long-range micellar structuring. For SDS foam films, predicted disjoining pressures are much higher than measured values. Comparison with cetyltrimethyl-ammonium bromide (CTAB) micellar films in the surface forces apparatus, however, shows near quantitative agreement. The nature of the confining interfaces thus plays a key role in supporting the internal micellar structuring. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. NR 52 TC 58 Z9 58 U1 0 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 15 PY 1994 VL 101 IS 8 BP 6979 EP 6991 DI 10.1063/1.468325 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PL716 UT WOS:A1994PL71600062 ER PT J AU LYNCH, DL TROULLIER, N KRESS, JD COLLINS, LA AF LYNCH, DL TROULLIER, N KRESS, JD COLLINS, LA TI QUANTUM MOLECULAR-DYNAMICS SIMULATIONS OF LIQUID ALKALIS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID TOTAL-ENERGY CALCULATIONS; ELECTRONIC-STRUCTURE CALCULATIONS; BAND-STRUCTURE; EQUILIBRIUM STRUCTURES; CLUSTERS; SYSTEMS; METALS; MODEL; POTENTIALS; SODIUM AB We employ a unified molecular dynamics (MD), quantum mechanical approach to simulate the behavior of large collections of atoms at finite temperature. The nuclei are moved according to classical mechanics while the forces are computed via quantum mechanical models. Two approaches have been used: (1) the extended Huckel method, which is an approximate molecular orbital approach and (2) density functional theory based on the local density approximation and plane wave pseudopotential formulation. We compute properties from the MD trajectories of up to 4 ps duration for samples containing up to 250 atoms of lithium, sodium, and potassium. These results are compared to both previous calculations and experimental results. C1 UNIV MINNESOTA,DEPT COMP SCI,MINNEAPOLIS,MN 55455. UNIV MINNESOTA,DEPT CHEM ENGN & MAT SCI,MINNEAPOLIS,MN 55455. UNIV MINNESOTA,MINNESOTA SUPERCOMP INST,MINNEAPOLIS,MN 55455. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP LYNCH, DL (reprint author), THINKING MACHINES CORP,245 1ST ST,CAMBRIDGE,MA 02142, USA. NR 65 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 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 15 PY 1994 VL 101 IS 8 BP 7048 EP 7057 DI 10.1063/1.468330 PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PL716 UT WOS:A1994PL71600068 ER PT J AU STRAUSS, HL CHEN, Z LOONG, CK AF STRAUSS, HL CHEN, Z LOONG, CK TI THE DIFFUSION OF H-2 IN HEXAGONAL ICE AT LOW-TEMPERATURES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Note ID HYDROGEN; SPECTRUM; WATER AB The diffusion of hydrogen molecules in hexagonal D2O ice (Ih) in the temperature range of 25-60 K was investigated by quasielastic neutron scattering. The observed spectra consist of a narrow elastic peak and a broad quasielastic component. The single-particle diffusion coefficient for H-2 in D2O ice was obtained using a simple model of diffusion and is remarkably high-comparable to;he coefficient of H-2 in a liquid. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP STRAUSS, HL (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. RI Chen, Zhan/G-8312-2016 OI Chen, Zhan/0000-0001-8687-8348 NR 24 TC 34 Z9 34 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 15 PY 1994 VL 101 IS 8 BP 7177 EP 7180 DI 10.1063/1.468303 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA PL716 UT WOS:A1994PL71600083 ER PT J AU MARTIN, JE ADOLF, D HALSEY, TC AF MARTIN, JE ADOLF, D HALSEY, TC TI ELECTRORHEOLOGY OF A MODEL COLLOIDAL FLUID SO JOURNAL OF COLLOID AND INTERFACE SCIENCE LA English DT Article ID VISCOELASTIC RESPONSE; SUSPENSIONS; DEPENDENCE AB We report experimental and theoretical results on the steady and oscillatory shear viscoelasticity of a model electrorheological fluid. Details of the fluid synthesis, via the nucleation and growth of monodisperse silica spheres, and light scattering studies of the spheres are also presented. The shear-thinning viscosity mu shows a power-law dependence mu similar to gamma(-Delta) on the inverse strain rate gamma, with Delta in the range 0.68-0.93. Likewise, the frequency-dependent viscosity mu(omega) shows a power-law dependence mu(omega) similar to omega(-($) over bar Delta) with ($) over bar Delta in the range 0.73-1.0. A theoretical treatment of steady-state cluster formation in applied electric and shear fields predicts the observed power-law dependences of the steady and oscillatory shear viscosities, albeit with exponents Delta = ($) over bar Delta = 2/3. (C) 1994 Academic Press, Inc. C1 UNIV CHICAGO,JAMES FRANCK INST,CHICAGO,IL 60637. UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637. RP MARTIN, JE (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 18 TC 43 Z9 43 U1 1 U2 9 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9797 J9 J COLLOID INTERF SCI JI J. Colloid Interface Sci. PD OCT 15 PY 1994 VL 167 IS 2 BP 437 EP 452 DI 10.1006/jcis.1994.1379 PG 16 WC Chemistry, Physical SC Chemistry GA PL690 UT WOS:A1994PL69000024 ER PT J AU BLAIR, PJ BULTMAN, SJ HAAS, JC ROUSE, BT WILKINSON, JE GODFREY, VL AF BLAIR, PJ BULTMAN, SJ HAAS, JC ROUSE, BT WILKINSON, JE GODFREY, VL TI CD4(+)CD8(-) T-CELLS ARE THE EFFECTOR-CELLS IN DISEASE PATHOGENESIS IN THE SCURFY (SF) MOUSE SO JOURNAL OF IMMUNOLOGY LA English DT Article ID EXPERIMENTAL ALLERGIC ENCEPHALOMYELITIS; LYMPHORETICULAR DISEASE; MONOCLONAL-ANTIBODIES; LYMPHOKINE ACTIVITIES; POSITIVE SELECTION; LYMPHOCYTES-T; B-CELLS; ANTIGEN; MICE; HELPER AB hemizygous for the X-linked mutation, scurfy (sf), exhibit a fatal lymphoreticular disease that is mediated by T lymphocytes. To evaluate the respective roles of CD4 or CD8 single positive T cells in scurfy disease, neonates were treated with mAbs directed against the CD4 or CD8 molecules. Whereas mice treated with an anti-CD8 Ab developed lesions and succumbed to disease at the same time (17 days) as their untreated scurfy littermates, mice treated with an anti-CD4 Ab lived up to 11 wk before developing scurfy disease. To insure a more complete elimination of the T cell subsets, the scurfy mutation was bred onto beta(2)-microglobulin (beta(2)m)-deficient (CD8-less) and CD4-deficient transgenic mouse lines. Whereas there was little moderation of disease in beta(2)m-deficient scurfy mice, CD4-deficient scurfy mice had markedly decreased scurfy lesions and a prolonged life span, similar to that of anti-CD4-treated sf/Y mice. Additionally, scurfy disease was transplanted into H-2-compatible nude mice through the adoptive transfer of CD4(+)CD8(-) T cells, but not CD4(-)CD8(+) T cells. Flow-cytometric analysis revealed that sf/Y mice have an increased percentage of activated CD4(+) T cells in their lymph nodes. In addition, there is an increase in the in vitro production of cytokines in the cultured splenocytes of CD8-less, but not CD4-less, scurfy mice. These data suggest that CD4(+) T cells are critical mediators of disease in the scurfy mouse. C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20889. UNIV TENNESSEE,DEPT MICROBIOL,KNOXVILLE,TN 37901. UNIV TENNESSEE,COLL VET MED,KNOXVILLE,TN 37901. FU PHS HHS [A132153] NR 47 TC 120 Z9 124 U1 1 U2 4 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD OCT 15 PY 1994 VL 153 IS 8 BP 3764 EP 3774 PG 11 WC Immunology SC Immunology GA PM581 UT WOS:A1994PM58100044 PM 7930593 ER PT J AU WERESZCZAK, AA KIRKLAND, TP FERBER, MK AF WERESZCZAK, AA KIRKLAND, TP FERBER, MK TI STRESS AND STRAIN RELAXATION BEHAVIOR IN HIPED SILICON NITRIDES SO JOURNAL OF MATERIALS SCIENCE LETTERS LA English DT Article ID CREEP RP WERESZCZAK, AA (reprint author), OAK RIDGE NATL LAB,HIGH TEMP MAT LAB,OAK RIDGE,TN 37831, USA. RI Wereszczak, Andrew/I-7310-2016 OI Wereszczak, Andrew/0000-0002-8344-092X NR 7 TC 5 Z9 5 U1 0 U2 2 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0261-8028 J9 J MATER SCI LETT JI J. Mater. Sci. Lett. PD OCT 15 PY 1994 VL 13 IS 20 BP 1469 EP 1471 DI 10.1007/BF00419137 PG 3 WC Materials Science, Multidisciplinary SC Materials Science GA PP296 UT WOS:A1994PP29600009 ER PT J AU ROCHE, AE KUMER, JB MERGENTHALER, JL NIGHTINGALE, RW UPLINGER, WG ELY, GA POTTER, JF WUEBBLES, DJ CONNELL, PS KINNISON, DE AF ROCHE, AE KUMER, JB MERGENTHALER, JL NIGHTINGALE, RW UPLINGER, WG ELY, GA POTTER, JF WUEBBLES, DJ CONNELL, PS KINNISON, DE TI OBSERVATIONS OF LOWER-STRATOSPHERIC CLONO2, HNO3, AND AEROSOL BY THE UARS CLAES EXPERIMENT BETWEEN JANUARY 1992 AND APRIL 1993 SO JOURNAL OF THE ATMOSPHERIC SCIENCES LA English DT Article ID ATMOSPHERE RESEARCH SATELLITE; POLAR VORTEX; NITRIC-ACID; REACTIVE NITROGEN; SEPTEMBER 1987; ARCTIC WINTER; OZONE; CLOUD; TEMPERATURE; ANTARCTICA AB This paper discusses simultaneous measurements of stratospheric ClONO2, HNO3, temperature, and aerosol extinction coefficient by the Cryogenic Limb Array Etalon Spectrometer (CLAES) on the NASA Upper Atmosphere Research Satellite (UARS), obtained over the period 9 January 1992 through 23 April 1993. The discussion concentrates on the stratosphere region near 21 km of particular interest to heterogeneously driven ozone depletion. For periods between 12 June and 1 September 1992 at latitudes poleward of about 60-degrees-S, when temperatures were below type I polar stratospheric cloud (PSC) formation thresholds throughout the lower stratosphere, CLAES observed high levels of PSCs coincident with highly depleted fields of both HNO3 and ClONO2. By 17 September, the incidence of PSCs had greatly diminished in the lower stratosphere, but both ClONO2 and HNO3 remained highly depleted. These observations are consistent with the removal of gaseous HNO3 through the formation of nitric acid trihydrate (NAT) particles and the removal of ClONO2 through heterogeneous reactions on the particle surfaces. They also suggest substantial denitrification of the lower Antarctic vortex through sedimentation of PSC particles. In the Northern Hemisphere winter of 1992/93 far fewer PSCs were observed in the Arctic lower-stratosphere vortex, which had shorter periods and more localized regions of cold temperatures. Both HNO3 and ClONO2 maintained much higher levels inside the Arctic vortex than those seen in the Antarctic throughout the winter/spring period. Following 28 February 1993 when Arctic vortex temperatures rose above 195 K, ClONO2 was observed in large quantities [> 2.1 ppbv near 21 km] inside the vortex. The persistence of relatively high levels of HNO3 inside the Arctic spring vortex compared with the low levels seen in the Antarctic spring vortex suggest a much lower level of denitrification in the Arctic. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP ROCHE, AE (reprint author), LOCKHEED PALO ALTO RES LABS,DEPT 9120,BLDG 255,3251 HANOVER ST,PALO ALTO,CA 94304, USA. NR 33 TC 85 Z9 85 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0022-4928 J9 J ATMOS SCI JI J. Atmos. Sci. PD OCT 15 PY 1994 VL 51 IS 20 BP 2877 EP 2902 DI 10.1175/1520-0469(1994)051<2877:OOLSCH>2.0.CO;2 PG 26 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA PN067 UT WOS:A1994PN06700008 ER PT J AU CARDIS, E GILBERT, ES CARPENTER, L HOWE, G KATO, I LAVE, EC ARMSTRONG, BK BERAL, V COWPER, G DOUGLAS, A ESTEVE FIX, J FRY, S KALDOR, J LAVE, C SALMON, L SMITH, PG VOELZ, G WIGGS, L AF CARDIS, E GILBERT, ES CARPENTER, L HOWE, G KATO, I LAVE, EC ARMSTRONG, BK BERAL, V COWPER, G DOUGLAS, A ESTEVE FIX, J FRY, S KALDOR, J LAVE, C SALMON, L SMITH, PG VOELZ, G WIGGS, L TI DIRECT ESTIMATES OF CANCER MORTALITY DUE TO LOW-DOSES OF IONIZING-RADIATION - AN INTERNATIONAL STUDY SO LANCET LA English DT Article ID ATOMIC-ENERGY-AUTHORITY; OCCUPATIONAL EXPOSURE; HANFORD SITE; WORKERS; EMPLOYEES; PLANT AB When setting standards for protection against ionising radiation it has been usual to extrapolate from experience with high-dose short-term exposure-studies based on atom bomb survivors and patients exposed to radiation therapeutically. Those who work in the nuclear industry are exposed to low-level predominantly gamma radiation for longer periods, and provide an alternative direct source of information. We have combined mortality data from seven cohort studies on nearly 96 000 nuclear industry workers monitored for external radiation in Canada, UK, and USA to assess directly the carcinogenic effects of protracted low-dose exposure to ionising radiation. The excess relative risk for death from leukaemia, excluding chronic lymphocytic leukaemia, was 2.2 per Sv (90% Cl 0.1 to 5.7). This estimate is intermediate between the linear estimate of 3.7 per Sv and the linear-quadratic estimate (as used in recent leukaemia risk assessments) of 1.4 per Sv derived from Japanese atomic bomb survivors' data. The excess relative risk for death from all cancers, excluding leukaemia, was -0.07 per Sv (90% Cl -0.4 to 0.3). This estimate is consistent with a range of risks varying from negative to nearly twice those estimated from atomic bomb survivors (0.18 per Sv). These are the most precise direct estimates so far made of carcinogenic risk after protracted exposure to low-dose ionising radiation. They provide little evidence that the estimates that form the basis of current radiation protection recommendations are appreciably in error. C1 PACIFIC NW LAB, RICHLAND, WA USA. DEPT PUBL HLTH & PRIMARY CARE, OXFORD, ENGLAND. UNIV TORONTO, TORONTO M5S 1A1, ON, CANADA. AUSTRALIAN INST HLTH & WELF, CANBERRA, ACT, AUSTRALIA. IMPERIAL CANC RES FUND, OXFORD, ENGLAND. LONDON SCH HYG & TROP MED, LONDON, ENGLAND. IARC, LYON, FRANCE. OAK RIDGE INST SCI & EDUC, OAK RIDGE, TN USA. NATL CTR HIV EPIDEMIOL & CLIN RES, SYDNEY, NSW, AUSTRALIA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM USA. RP CARDIS, E (reprint author), INT AGCY RES CANC, 150 COURS ALBERT THOMAS, F-69372 LYON 08, FRANCE. RI Beral, Valerie/B-2979-2013; Kaldor, John /D-4545-2011; Armstrong, Bruce/K-9464-2015; Cardis, Elisabeth/C-3904-2017 OI Armstrong, Bruce/0000-0001-8940-7525; NR 26 TC 56 Z9 57 U1 0 U2 0 PU LANCET LTD PI LONDON PA 42 BEDFORD SQUARE, LONDON, ENGLAND WC1B 3SL SN 0140-6736 J9 LANCET JI Lancet PD OCT 15 PY 1994 VL 344 IS 8929 BP 1039 EP 1043 PG 5 WC Medicine, General & Internal SC General & Internal Medicine GA PL852 UT WOS:A1994PL85200006 ER PT J AU EMANUEL, I SEVER, LE MILHAM, S THULINE, H AF EMANUEL, I SEVER, LE MILHAM, S THULINE, H TI INCREASED RISK OF ALZHEIMERS-DISEASE IN MOTHERS OF ADULTS WITH DOWNS-SYNDROME SO LANCET LA English DT Letter C1 BATTELLE SEATLE RES CTR,SEATTLE,WA. RP EMANUEL, I (reprint author), UNIV WASHINGTON,DEPT EPIDEMIOL,SEATTLE,WA 98195, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU LANCET LTD PI LONDON PA 42 BEDFORD SQUARE, LONDON, ENGLAND WC1B 3SL SN 0140-6736 J9 LANCET JI Lancet PD OCT 15 PY 1994 VL 344 IS 8929 BP 1094 EP 1094 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA PL852 UT WOS:A1994PL85200060 PM 7826429 ER PT J AU RUGGLES, MB CHENG, S KREMPL, E AF RUGGLES, MB CHENG, S KREMPL, E TI THE RATE-DEPENDENT MECHANICAL-BEHAVIOR OF MODIFIED 9WT-PERCENT-CR-1WT-PERCENT-MO STEEL AT 538-DEGREES-C SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID TYPE-304 STAINLESS-STEEL; CONSTITUTIVE-EQUATIONS; 316-STAINLESS STEEL; ROOM-TEMPERATURE; RATE-SENSITIVITY; VISCOPLASTICITY; DEFORMATION; OVERSTRESS; RELAXATION; METALS AB Uniaxial, strain controlled tests at strain rates ranging from 5.0 x 10(-3) to 1.0 x 10(-7) s(-1) combined with relaxation tests were performed to determine the mechanical behavior and the influence of recovery of state and other softening mechanisms. In addition, attempts were made to measure the equilibrium (back) stress of modified 9wt.%Cr-1wt.%Mo steel at 538 degrees C using McLean-type dip tests. Testing was performed with an MTS servohydraulic computer-controlled testing machine, a clamshell furnace and an MTS high temperature extensometer which measured the strain on the gauge length of the specimen. C1 RENSSELAER POLYTECH INST,MECH MAT LAB,TROY,NY 12180. RP RUGGLES, MB (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Ruggles-Wrenn, Marina/J-6103-2014 NR 26 TC 12 Z9 12 U1 1 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD OCT 15 PY 1994 VL 186 IS 1-2 BP 15 EP 21 DI 10.1016/0921-5093(94)90301-8 PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA PG003 UT WOS:A1994PG00300002 ER PT J AU PRZYSTUPA, MA VASUDEVAN, AK ROLLETT, AD AF PRZYSTUPA, MA VASUDEVAN, AK ROLLETT, AD TI CRYSTALLOGRAPHIC TEXTURE GRADIENTS IN THE ALUMINUM-8090 MATRIX ALLOY AND 8090-PARTICULATE COMPOSITES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID ROLLING TEXTURES; RECRYSTALLIZATION; MICROSTRUCTURE; DEFORMATION; CRYSTAL; SHEET AB Al-Li alloys develop sharp textures with a strong brass component after fabrication. In the case of thick sheet and plate extrusions through thickness texture gradients are also commonly observed. These textures are different from those that develop in conventional aluminum alloys and their origin has not yet been completely understood. In the present work the sources of texture gradients in the 8090 alloy and 8090 based particulate composites, both formed as thick plate extrusions, have been studied. Results showed that strain gradients, and redundant shears in particular, are responsible for the development of textures in the 8090 alloys. In the SiC reinforced particulate composites, the presence of reinforcement resulted in the development of significantly weaker deformation textures without dominant brass component within the plate and a mixture of recrystallization and surface shear type textures at the surface. The development of textures in the composites has been attributed to the absence of redundant shears in the bulk and to a surface deformation gradient introduced by the presence of SiC particles. C1 OFF NAVAL RES,ARLINGTON,VA 22217. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP PRZYSTUPA, MA (reprint author), UNIV CALIF LOS ANGELES,DEPT MAT SCI & ENGN,LOS ANGELES,CA 90024, USA. RI Rollett, Anthony/A-4096-2012 OI Rollett, Anthony/0000-0003-4445-2191 NR 30 TC 10 Z9 10 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD OCT 15 PY 1994 VL 186 IS 1-2 BP 35 EP 44 DI 10.1016/0921-5093(94)90303-4 PG 10 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA PG003 UT WOS:A1994PG00300004 ER PT J AU KATZ, N QUINN, T BERTSCHINGER, E GELB, JM AF KATZ, N QUINN, T BERTSCHINGER, E GELB, JM TI FORMATION OF QUASARS AT HIGH-REDSHIFT SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Letter DE GALAXIES, FORMATION; QUASARS, GENERAL ID COLD DARK MATTER; GALAXY FORMATION; UNIVERSE; EVOLUTION; MERGERS; PEAKS; GAS AB Analytic arguments have suggested that the existence of high-redshift quasars challenges hierarchical galaxy formation theories in which the majority of galaxies form late. We address this issue by using a series of numerical simulations of the biased cold dark matter model with and without gas dynamics. Potential quasar sites are identified with massive density peaks collapsing to form massive self-gravitating cold, gas clouds. The Press-Schechter formalism, using a Gaussian filter with delta(c) = 1.61, correctly predicts the number of high-mass dark haloes. Very efficient cooling and angular momentum transfer to the dark halo, however, allow the gas to become much denser than naive predictions would suggest. We find that there are > 10(3) times the required number of potential quasar sites at z = 4.5; at z = 8 there is already at least one site in our simulation volume of 10(6) Mpc(3). Thus sites for quasars could easily form at significantly higher redshifts than those of observed quasars, even in models where most galaxy formation occurs late. C1 MIT,DEPT PHYS,CAMBRIDGE,MA 02139. NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. NR 29 TC 39 Z9 39 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0035-8711 J9 MON NOT R ASTRON SOC JI Mon. Not. Roy. Astron. Soc. PD OCT 15 PY 1994 VL 270 IS 4 BP L71 EP & PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PN052 UT WOS:A1994PN05200003 ER PT J AU BREIDENBACH, M FOSS, M HODGSON, J KULIKOV, A ODIAN, A PUTALLAZ, G ROGERS, H SCHINDLER, R SKARPAAS, K ZOLOTOREV, M AF BREIDENBACH, M FOSS, M HODGSON, J KULIKOV, A ODIAN, A PUTALLAZ, G ROGERS, H SCHINDLER, R SKARPAAS, K ZOLOTOREV, M TI AN INVERTED-GEOMETRY, HIGH-VOLTAGE POLARIZED ELECTRON-GUN WITH UHV LOAD LOCK SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID GAAS; PHOTOEMISSION AB The design of a high voltage electron source with a GaAs photocathode and a load lock system is described. The inverted high voltage structure of the gun permits a compact and simple design. Test results demonstrate that the load lock system provides a reliable way to achieve high quantum efficiency of the photocathode in a high voltage device. RP BREIDENBACH, M (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 6 TC 10 Z9 10 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD OCT 15 PY 1994 VL 350 IS 1-2 BP 1 EP 7 DI 10.1016/0168-9002(94)91146-0 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PL588 UT WOS:A1994PL58800001 ER PT J AU ALKIRE, RW SULLIVAN, EP MICHAUD, FD TRELA, WJ BARTLETT, RJ AF ALKIRE, RW SULLIVAN, EP MICHAUD, FD TRELA, WJ BARTLETT, RJ TI THE X8C DUAL WIRE BEAM POSITION MONITOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID SYNCHROTRON RADIATION AB Design and performance of a UHV compatible dual wire beam position monitor are presented with specific applications to beamline X8C at the NSLS. This device can determine the relative vertical position of the X-ray beam to within +/- 5 mum. At X8C, the wire monitor is used to observe the reproducibility of the X-ray beam position after each new electron fill and to watch for instabilities that may arise during stored beam conditions. Data from the NSLS X-ray ring pick-up electrodes are presented to independently assess wire monitor accuracy. C1 EG&G,ENERGY MEASUREMENTS,WOBURN,MA 01801. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP ALKIRE, RW (reprint author), ARGONNE NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,BLDG 725-X8C,UPTON,NY 11973, USA. NR 6 TC 4 Z9 4 U1 3 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD OCT 15 PY 1994 VL 350 IS 1-2 BP 13 EP 16 DI 10.1016/0168-9002(94)91148-7 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PL588 UT WOS:A1994PL58800003 ER PT J AU BARLETTA, WA SESSLER, AM AF BARLETTA, WA SESSLER, AM TI CHARACTERISTICS OF A HIGH-ENERGY MU+MU- COLLIDER BASED ON ELECTRO-PRODUCTION OF MUONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB We analyze the design of a high energy mu+mu- collider based on electro-production of muons. We derive an expression for the luminosity in terms of analytic formulae for the electron-to-muon conversion efficiency and the electron beam power on the production target. On the basis of studies of self-consistent sets of collider parameters under ''realistic'' (''optimistic'') assumptions about available technology with beam cooling, we find the luminosity limited to 10(27) cm-2 s-1 (10(28) cm-2 s-1). We also identify major technological innovations that will be required before mu+mu- colliders can offer sufficient luminosity (10(30) cm-2 s-1) for high energy physics research. RP BARLETTA, WA (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 9 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD OCT 15 PY 1994 VL 350 IS 1-2 BP 36 EP 44 DI 10.1016/0168-9002(94)91152-5 PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PL588 UT WOS:A1994PL58800007 ER PT J AU RUGGIERO, AG AF RUGGIERO, AG TI A MUON COLLIDER SCENARIO BASED ON STOCHASTIC COOLING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB The most severe limitation to the muon production for a large-energy muon collider is the short time allowed for cooling the beam to dimensions small enough to provide reasonably high luminosity. The limitation is caused by the short lifetime of the particles that, for instance, at the energy of 100 GeV is of only 2.2 ms. Moreover, it appears to be desirable to accelerate the beam quickly, with very short bunches of about a millimeter so it can be made immediately available for the final collision. This paper describes the requirements of single-pass, fast stochastic cooling for very short bunches. Bandwidth, amplifier gain and Schottky power do not seem to be of major concern. Problems do arise with the ultimate low emittance that can be achieved, the value of which is seriously affected by the front-end thermal noise. Since mixing within the beam bunches is completely absent, methods are required for the regeneration of the beam signal with external and powerful magnetic lenses. The feasibility of these methods are crucial for the development of the muon collider. These methods will be studied in a subsequent report. RP RUGGIERO, AG (reprint author), BROOKHAVEN NATL LAB,DEPT ADV TECHNOL,UPTON,NY 11973, USA. NR 10 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD OCT 15 PY 1994 VL 350 IS 1-2 BP 45 EP 52 DI 10.1016/0168-9002(94)91153-3 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PL588 UT WOS:A1994PL58800008 ER PT J AU CHATTOPADHYAY, S BARLETTA, W MAURY, S NEUFFER, D RUGGIERO, A SESSLER, A AF CHATTOPADHYAY, S BARLETTA, W MAURY, S NEUFFER, D RUGGIERO, A SESSLER, A TI CRITICAL ISSUES IN LOW-ENERGY MUON COLLIDERS - A SUMMARY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB We present a brief summary of the current state of conception and understanding of the accelerator physics issues for low energy muon colliders envisioned as Higgs factories, associated technological challenges and future research directions on this topic. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. BNL,UPTON,NY 11973. CERN,CH-1211 GENEVA 23,SWITZERLAND. CEBAF,NEWPORT NEWS,VA 23606. NR 9 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD OCT 15 PY 1994 VL 350 IS 1-2 BP 53 EP 56 DI 10.1016/0168-9002(94)91154-1 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PL588 UT WOS:A1994PL58800009 ER PT J AU AMIDEI, D AZZI, P BACCHETTA, N BAILEY, MW BARNETT, B BEDESCHI, F BISELLO, D BOLOGNESI, V BOSWELL, C BUSETTO, G CARITHERS, WC CARTER, H CASTRO, A DELLAGNELLO, S DERWENT, PF DUCAR, R DUNN, A ELY, R FLAUGHER, B GALEOTTI, S BARBAROGALTIERI, A GARFINKEL, AF HABER, C HOLLAND, S HRYCYK, M HERRUP, D HUGHES, R KLEINFELDER, S LORETI, M MARIOTTI, M MATTHEWS, J MENZIONE, A MERRICK, T NELSON, C PESCARA, L PRODUIT, N PUNZI, G RAFFAELLI, F RISTORI, L SCHNEIDER, O SEGLER, S SHAPIRO, MD SHAW, NM SHAW, T SKARHA, J SNIDER, FD SONG, TY SPIES, A TIPTON, P TKACZYK, S TARTARELLI, F TSENG, J TURINI, N TURNER, K VEJCIK, S WATTS, G WESSON, TR WESTER, WC WENZEL, H WONG, M YAO, W ZETTI, F AF AMIDEI, D AZZI, P BACCHETTA, N BAILEY, MW BARNETT, B BEDESCHI, F BISELLO, D BOLOGNESI, V BOSWELL, C BUSETTO, G CARITHERS, WC CARTER, H CASTRO, A DELLAGNELLO, S DERWENT, PF DUCAR, R DUNN, A ELY, R FLAUGHER, B GALEOTTI, S BARBAROGALTIERI, A GARFINKEL, AF HABER, C HOLLAND, S HRYCYK, M HERRUP, D HUGHES, R KLEINFELDER, S LORETI, M MARIOTTI, M MATTHEWS, J MENZIONE, A MERRICK, T NELSON, C PESCARA, L PRODUIT, N PUNZI, G RAFFAELLI, F RISTORI, L SCHNEIDER, O SEGLER, S SHAPIRO, MD SHAW, NM SHAW, T SKARHA, J SNIDER, FD SONG, TY SPIES, A TIPTON, P TKACZYK, S TARTARELLI, F TSENG, J TURINI, N TURNER, K VEJCIK, S WATTS, G WESSON, TR WESTER, WC WENZEL, H WONG, M YAO, W ZETTI, F TI THE SILICON VERTEX DETECTOR OF THE COLLIDER DETECTOR AT FERMILAB SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID CDF; SYSTEM; CONSTRUCTION; CHAMBER; READOUT; DESIGN AB A silicon microstrip vertex detector has been constructed and installed in the Collider Detector at Fermilab. The device has been designed to operate at a hadron collider. It began collecting data in May of 1992 and has functioned within specification. Technical details are presented on all aspects of the system and its performance. C1 UNIV CALIF BERKELEY,BERKELEY,CA 94720. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. UNIV MICHIGAN,ANN ARBOR,MI 48109. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. UNIV PADUA,I-35100 PADUA,ITALY. UNIV ROCHESTER,ROCHESTER,NY 14627. UNIV PISA,I-56100 PISA,ITALY. SCUOLA NORMALE SUPER PISA,I-56100 PISA,ITALY. PURDUE UNIV,W LAFAYETTE,IN 47907. IST NAZL FIS NUCL,I-56100 PISA,ITALY. RI Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Holland, Stephen/H-7890-2013; Tartarelli, Giuseppe Francesco/A-5629-2016; OI Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Tartarelli, Giuseppe Francesco/0000-0002-4244-502X; Turini, Nicola/0000-0002-9395-5230 NR 28 TC 167 Z9 166 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD OCT 15 PY 1994 VL 350 IS 1-2 BP 73 EP 130 DI 10.1016/0168-9002(94)91156-8 PG 58 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PL588 UT WOS:A1994PL58800011 ER PT J AU BENARY, O CLELAND, W FERGUSON, I GORDEEV, A GORDON, H KISTENEV, E KROON, P LELTCHOUK, M LISSAUER, D MA, H MAKOWIECKI, D MASLENNIKOV, A MCCORKLE, S ONOPRIENKO, D ONUCHIN, A OREN, Y PANIN, V PARSONS, JA RADEKA, V ROGERS, L RAHM, D RESCIA, S RUTHERFOORD, J SEMAN, M SMITH, M SONDERICKER, J STEINER, R STEPHANI, D STERN, E STUMER, I TAKAI, H THEMANN, H TIKHONOV, Y WILLIS, W AF BENARY, O CLELAND, W FERGUSON, I GORDEEV, A GORDON, H KISTENEV, E KROON, P LELTCHOUK, M LISSAUER, D MA, H MAKOWIECKI, D MASLENNIKOV, A MCCORKLE, S ONOPRIENKO, D ONUCHIN, A OREN, Y PANIN, V PARSONS, JA RADEKA, V ROGERS, L RAHM, D RESCIA, S RUTHERFOORD, J SEMAN, M SMITH, M SONDERICKER, J STEINER, R STEPHANI, D STERN, E STUMER, I TAKAI, H THEMANN, H TIKHONOV, Y WILLIS, W TI AN ACCORDION LIQUID ARGON ELECTROMAGNETIC CALORIMETER WITH ABSORBER IN ALL ELECTRODES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID PERFORMANCE; GEOMETRY AB A prototype electromagnetic liquid argon calorimeter with accordion geometry, using absorber material in all electrodes, has been constructed and tested. This construction results in twice the sampling frequency compared to the conventional accordion electrode structure. The energy resolution, measured with 15 GeV electrons, was found to be 6.3%/square-rootE, in good agreement with the value expected from Monte Carlo simulations. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. ADELPHI UNIV,GARDEN CITY,NY 11530. UNIV ARIZONA,TUCSON,AZ 85721. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV PITTSBURGH,PITTSBURGH,PA 15260. BUDKER INST NUCL PHYS,NOVOSIBIRSK,RUSSIA. TEL AVIV UNIV,IL-69978 TEL AVIV,ISRAEL. SUNY STONY BROOK,STONY BROOK,NY 11794. COLUMBIA UNIV,NEVIS LABS,IRVINGTON,NY 10533. RI Rescia, Sergio/D-8604-2011; Takai, Helio/C-3301-2012 OI Rescia, Sergio/0000-0003-2411-8903; Takai, Helio/0000-0001-9253-8307 NR 6 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD OCT 15 PY 1994 VL 350 IS 1-2 BP 131 EP 135 DI 10.1016/0168-9002(94)91157-6 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PL588 UT WOS:A1994PL58800012 ER PT J AU EBERHARD, PH UCHIYAMA, F AF EBERHARD, PH UCHIYAMA, F TI NEUTRAL-KAON REGENERATION PROBABILITIES AT ASYMMETRIC PHI-FACTORY ENERGIES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID QUANTUM-MECHANICS; REALISM AB Theoretical estimates of neutral-kaon regeneration amplitudes and probabilities are given for various materials and kaon momenta between 0.35 and 2.6 GeV/c. These estimates can be used, in particular, to optimize experimental conditions at asymmetric phi-factories when regeneration of neutral kaons is involved. As an example, this data is used to find best parameters for a test of non-local interferences in quantum mechanics. C1 UNIV TSUKUBA,INST APPL PHYS,TSUKUBA,IBARAKI 305,JAPAN. RP EBERHARD, PH (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 27 TC 19 Z9 19 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD OCT 15 PY 1994 VL 350 IS 1-2 BP 144 EP 149 DI 10.1016/0168-9002(94)91159-2 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PL588 UT WOS:A1994PL58800014 ER PT J AU CORNELL, EW ARONSON, SH AWES, TC CHANG, J COSTALES, JB EWELL, LA FUNG, Y GAVRON, A HE, X HILL, JC KANG, SJH KEHOE, WL KIM, H KREKE, J LIU, XT MAGUIRE, CF MURTAGH, MJ NAMBOODIRI, MN OBENSHAIN, FE PETITT, GA SAINI, S SANGSTER, TC SORENSEN, SP STARKS, M STEADMAN, SG THOMAS, JH TINCKNELL, ML WATERS, L WOHN, FK YOUNG, GR ZHANG, Z ZHOU, S AF CORNELL, EW ARONSON, SH AWES, TC CHANG, J COSTALES, JB EWELL, LA FUNG, Y GAVRON, A HE, X HILL, JC KANG, SJH KEHOE, WL KIM, H KREKE, J LIU, XT MAGUIRE, CF MURTAGH, MJ NAMBOODIRI, MN OBENSHAIN, FE PETITT, GA SAINI, S SANGSTER, TC SORENSEN, SP STARKS, M STEADMAN, SG THOMAS, JH TINCKNELL, ML WATERS, L WOHN, FK YOUNG, GR ZHANG, Z ZHOU, S TI CALORIMETER ABSORBER OPTIMIZATION FOR A RHIC DIMUON EXPERIMENT SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB The RD-10/45 research and development effort on calorimeter/absorber optimization for a Relativistic Heavy Ion Collider dimuon experiment had an extended run in 1991 and 1992 at the BNL Alternating Gradient Synchrontron. Measurements were made of the leakage of 1-8 GeV/c particles behind various model hadron calorimeters. Behavior of the calorimeter/absorber as a muon-identifier was studied Comparisons of data from the RD-10/45 experiment to results calculated with the GEANT 3.15 simulation package using the GHEISHA and FLUKA hadron shower codes were made. C1 GEORGIA STATE UNIV,ATLANTA,GA 30303. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521. MIT,CAMBRIDGE,MA 02139. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV TENNESSEE,KNOXVILLE,TN 37916. VANDERBILT UNIV,NASHVILLE,TN 37235. CHINA INST ATOM ENERGY,BEIJING,PEOPLES R CHINA. RP CORNELL, EW (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. OI Thomas, James/0000-0002-6256-4536 NR 13 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD OCT 15 PY 1994 VL 350 IS 1-2 BP 150 EP 173 DI 10.1016/0168-9002(94)91160-6 PG 24 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA PL588 UT WOS:A1994PL58800015 ER PT J AU STRAUSS, CEM AF STRAUSS, CEM TI SYNTHETIC-ARRAY HETERODYNE-DETECTION - A SINGLE-ELEMENT DETECTOR ACTS AS AN ARRAY SO OPTICS LETTERS LA English DT Article ID TURBULENCE AB A simple technique, synthetic-array heterodyne detection, permits an ordinary single-element optical detector to behave as though it were a coherent array. A successful experimental implementation of a synthetic two-pixel array, using a CO2 laser and a single-element HgCdTe photodiode is reported. A different heterodyne local oscillator frequency is incident upon each resolvable region of the detector surface. Thus different regions are mapped to different heterodyne beat frequencies. One can determine where the photons struck the detector surface even though a single electrical connection to the detector is used. This also prevents the destructive interference that occurs when multiple speckles are imaged (akin to spatial diversity). In coherent lidar this permits a larger field of view. An acousto-optic modulator produces the local oscillator frequencies and can achieve good spatial separation of optical frequencies of the order of a megahertz apart. RP STRAUSS, CEM (reprint author), LOS ALAMOS NATL LAB,POB 1663,LOS ALAMOS,NM 87545, USA. NR 7 TC 5 Z9 5 U1 0 U2 5 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD OCT 15 PY 1994 VL 19 IS 20 BP 1609 EP 1611 DI 10.1364/OL.19.001609 PG 3 WC Optics SC Optics GA PL585 UT WOS:A1994PL58500004 PM 19855597 ER PT J AU HAMILTON, CE BEACH, RJ SUTTON, SB FURU, LH KRUPKE, WF AF HAMILTON, CE BEACH, RJ SUTTON, SB FURU, LH KRUPKE, WF TI 1-W AVERAGE POWER LEVELS AND TUNABILITY FROM A DIODE-PUMPED 2.94-MU-M ER-YAG OSCILLATOR SO OPTICS LETTERS LA English DT Article ID LASER AB A tunable Er:YAG laser, side pumped by a quasi-cw InGaAs diode array, generates > 500 mW of power at 2.936 mu m. The cavity is a 4-cm plano-concave resonator that uses total internal reflection on the pump face of the Er:YAG crystal to couple the diode emission into the resonating modes of the oscillator. Tuning is accomplished by angle tuning a 300-mu m-thick YAG etalon. The tuning range is 2.933-2.939 mu m. Thermal lensing limits the duty factor to 4% or 8%, depending on the Er:YAG crystal thickness (2 or 1 mm). A 2.5-cm-long resonator operates at an 11% duty factor and generates 1.3 W of average power. RP HAMILTON, CE (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 13 TC 27 Z9 27 U1 1 U2 10 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD OCT 15 PY 1994 VL 19 IS 20 BP 1627 EP 1629 DI 10.1364/OL.19.001627 PG 3 WC Optics SC Optics GA PL585 UT WOS:A1994PL58500010 PM 19855603 ER PT J AU HOU, JG XIANG, XD COHEN, ML ZETTL, A AF HOU, JG XIANG, XD COHEN, ML ZETTL, A TI GRANULARITY AND UPPER CRITICAL FIELDS IN K3C60 SO PHYSICA C LA English DT Article ID DOPED C-60; STATE; SUPERCONDUCTIVITY; POWDERS; FILMS AB The magnetoresistance of superconducting K3C60 samples with different granularity has been measured in fields up to 7.5 T. The upper critical field H(c2)(T) is dependent on the grain size of the K3C60 regions within the sample: dH(c2)(T)/dT varies from -2.18 to -2.8 T/K near the superconducting transition temperature. At low temperatures, a small grain size leads to an apparent enhancement in H(c2)(0). C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RI Hou, Jianguo/G-5076-2010; Xiang, Xiaodong/A-9445-2012; Zettl, Alex/O-4925-2016; Xiang, Xiaodong/A-5936-2017 OI Zettl, Alex/0000-0001-6330-136X; NR 19 TC 7 Z9 7 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD OCT 15 PY 1994 VL 232 IS 1-2 BP 22 EP 26 DI 10.1016/0921-4534(94)90288-7 PG 5 WC Physics, Applied SC Physics GA PN713 UT WOS:A1994PN71300005 ER PT J AU LI, YF SHENG, ZZ SENGUPTA, S GORETTA, KC MORGAN, PED AF LI, YF SHENG, ZZ SENGUPTA, S GORETTA, KC MORGAN, PED TI SYNTHESIS AND PROPERTIES OF TL0.6V0.5SR2CA2CU3OX SO PHYSICA C LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; CERAMIC SUPERCONDUCTOR; TL; PHASE; FILMS; TAPE AB Powder of approximate composition Tl0.6V0.5Sr2Ca2Cu3O(x) was synthesized in O2 at 970-degrees-C from a mixture of oxides of nominal composition Tl2V0.5Sr2Ca2Cu3O(x). The onset T(c) was 110 K. Magnetic hysteresis measurements indicated that above almost-equal-to 60 K the irreversibility behavior was superior to that of TlBa2Ca2Cu3O(x), which has a T(c) of almost-equal-to 118 K. The individual grains were up to almost-equal-to 50 mum in length, with aspect ratios < 10, which may during fabrication promote texturing by mechanical means. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV ARKANSAS,DEPT PHYS,FAYETTEVILLE,AR 72701. ROCKWELL INT SCI CTR,THOUSAND OAKS,CA 91360. NR 26 TC 1 Z9 1 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD OCT 15 PY 1994 VL 232 IS 1-2 BP 184 EP 188 DI 10.1016/0921-4534(94)90312-3 PG 5 WC Physics, Applied SC Physics GA PN713 UT WOS:A1994PN71300029 ER PT J AU BONCA, J GUBERNATIS, JE AF BONCA, J GUBERNATIS, JE TI DEGENERATE ANDERSON IMPURITY MODEL IN THE PRESENCE OF SPIN-ORBIT AND CRYSTAL-FIELD SPLITTING SO PHYSICAL REVIEW B LA English DT Article ID DILUTE MAGNETIC-ALLOYS; RENORMALIZATION-GROUP APPROACH; MONTE-CARLO SIMULATIONS; LARGE-N EXPANSION; STATIC PROPERTIES; MAXIMUM-ENTROPY; SPECTRA AB Using a quantum Monte Carlo technique combined with the method of maximum entropy, we calculated the magnetic susceptibility and spectral properties of the degenerate single-impurity Anderson model in the presence of spin-orbit and crystal-field splitting. At small hybridization and moderate temperatures, the magnetic susceptibility displays a nonuniversal behavior. Under the influence of spin-orbit splitting, the magnetic susceptibility decreases due to the quenching of a sixfold-degenerate state to an effectively doubly degenerate state. The effect of crystal-field splitting on the magnetic susceptibility is less pronounced. The temperature dependence of the spectral function changes dramatically under the influence of spin-orbit splitting. In the accessible temperature regime, the central peak at omega similar to 0 decreases with decreasing temperature. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP BONCA, J (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 22 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1994 VL 50 IS 15 BP 10427 EP 10434 DI 10.1103/PhysRevB.50.10427 PG 8 WC Physics, Condensed Matter SC Physics GA PP124 UT WOS:A1994PP12400001 ER PT J AU SKYTT, P GLANS, P MANCINI, DC GUO, JH WASSDAHL, N NORDGREN, J MA, Y AF SKYTT, P GLANS, P MANCINI, DC GUO, JH WASSDAHL, N NORDGREN, J MA, Y TI ANGLE-RESOLVED SOFT-X-RAY FLUORESCENCE AND ABSORPTION STUDY OF GRAPHITE SO PHYSICAL REVIEW B LA English DT Article ID EXCITATION-ENERGY DEPENDENCE; SECONDARY-ELECTRON EMISSION; SINGLE-CRYSTAL GRAPHITE; SYNCHROTRON-RADIATION; BAND-STRUCTURE; INVERSE PHOTOEMISSION; FINE-STRUCTURE; EDGE; SPECTROSCOPY; SCATTERING AB The x-ray fluorescence and absorption of highly oriented pyrolytic graphite have been measured using monochromatic synchrotron radiation. The spectra can be separated into contributions from pi- and sigma-band components by measuring at different angles of incidence and at different emission angles. The shape of the x-ray fluorescence spectra varies dramatically with excitation energy near the C K edge. This dependence on excitation energy can be interpreted within a resonant-inelastic-scattering formalism. The results are compared with previously published band-structure calculations and photoemission results, and demonstrate the potential for using x-ray fluorescence to obtain symmetry-resolved band information. C1 UNIV WASHINGTON, DEPT PHYS, SEATTLE, WA 98195 USA. PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RP SKYTT, P (reprint author), UNIV UPPSALA, DEPT PHYS, BOX 530, S-75121 UPPSALA, SWEDEN. NR 30 TC 117 Z9 118 U1 2 U2 13 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1994 VL 50 IS 15 BP 10457 EP 10461 DI 10.1103/PhysRevB.50.10457 PG 5 WC Physics, Condensed Matter SC Physics GA PP124 UT WOS:A1994PP12400005 ER PT J AU WOLVERTON, C ZUNGER, A AF WOLVERTON, C ZUNGER, A TI COMPARISON OF 2 CLUSTER-EXPANSION METHODS FOR THE ENERGETICS OF PD-V ALLOYS SO PHYSICAL REVIEW B LA English DT Article ID TRANSITION-METAL ALLOYS; ELECTRONIC-STRUCTURE CALCULATIONS; TIGHT-BINDING THEORY; 1ST-PRINCIPLES CALCULATION; INTERMETALLIC COMPOUNDS; PHASE-STABILITY; MOMENTS DEVELOPMENTS; TI SYSTEM; ENERGY; GAAS AB The formation energies of substitutional transition-metal alloys are examined by several means. First, two types of direct total-energy calculations are considered, namely, (i) the local-density approximation (LDA), and (ii) a tight-binding (TB) approximation thereof. Second, these directly calculated total energies are used to construct two Ising-like cluster expansions that, if sufficiently accurate, could be used to construct the full statistical mechanics of transition-metal alloys. These are (a) the Connolly-Williams (CW) method, and (b) direct configurational averaging (DCA). Finally, the ability of these two cluster expansions [(a) and (b)] to fit and predict a large number of the underlying directly calculated [(i) and (ii)] total energies is tested, by the average prediction error chi. These tests are performed for a large number of Pd-V alloys, and also to a more limited extent, for the Pd-Rh, Pd-Ti, and Pt-V systems. We find for Pd-V that (i) direct TB calculations show significant overbinding (too-negative formation energies) relative to the LDA, with average error of chi=112 meV/atom (a typical formation energy of Pd0.50V0.50 is similar to -250 meV/atom); (ii) the CW cluster expansion mimics quite well the results of the respective direct calculations, whether LDA (chi=19 meV/atom) or TB (chi=19 meV/atom); (iii) the DCA cluster expansions provides a less accurate depiction of the TB energies on which it is based (chi=65 meV/atom); (iv) the prediction errors for the equimolar random alloys are significantly larger using the DCA than using the CW method. In Light of (i) above, it appears that the tight-binding model needs to be refined before it can be used systematically for (either DCA or CW) cluster expansions. RP WOLVERTON, C (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. RI Wolverton, Christopher/B-7542-2009; Zunger, Alex/A-6733-2013 NR 69 TC 22 Z9 22 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1994 VL 50 IS 15 BP 10548 EP 10560 DI 10.1103/PhysRevB.50.10548 PG 13 WC Physics, Condensed Matter SC Physics GA PP124 UT WOS:A1994PP12400014 ER PT J AU STOKBRO, K CHETTY, N JACOBSEN, KW NORSKOV, JK AF STOKBRO, K CHETTY, N JACOBSEN, KW NORSKOV, JK TI EFFECTIVE-MEDIUM TIGHT-BINDING MODEL FOR SILICON SO PHYSICAL REVIEW B LA English DT Article ID TOTAL-ENERGY CALCULATIONS; NORM-CONSERVING PSEUDOPOTENTIALS; MOLECULAR-DYNAMICS; SURFACE RECONSTRUCTION; CHEMICAL-BINDING; ELECTRON-GAS; SYSTEMS; SI(111); METALS; SOLIDS AB A method for calculating the total energy of Si systems, which is based on the effective-medium-theory concept of a reference system, is presented. Instead of calculating the energy of an atom in the system of interest, a reference system is introduced where the local surroundings are similar. The energy of the reference system can be calculated self-consistently once and for ah while the energy difference to the reference system can be obtained approximately. We propose to calculate it using the tight-binding linear-muffin-tin-orbital scheme with the atomic-sphere approximation (ASA) for the potential, and by using the ASA with charge-conserving spheres we are able to treat open systems without introducing empty spheres. All steps in the calculational method are ab initio in the sense that all quantities entering are calculated from first principles without any fitting to experiment. A complete and detailed description of the method is given together with test calculations of the energies of phonons, elastic constants, different structures, surfaces, and surface reconstructions. We compare the results to calculations using an empirical tight-binding scheme. C1 TECH UNIV DENMARK, DEPT PHYS, DK-2800 LYNGBY, DENMARK. BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. RP TECH UNIV DENMARK, CTR ATOM SCALE MAT PHYS, DK-2800 LYNGBY, DENMARK. RI Jacobsen, Karsten/B-3602-2009; Norskov, Jens/D-2539-2017 OI Jacobsen, Karsten/0000-0002-1121-2979; Norskov, Jens/0000-0002-4427-7728 NR 56 TC 19 Z9 19 U1 2 U2 4 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 OCT 15 PY 1994 VL 50 IS 15 BP 10727 EP 10741 DI 10.1103/PhysRevB.50.10727 PG 15 WC Physics, Condensed Matter SC Physics GA PP124 UT WOS:A1994PP12400035 ER PT J AU MCMAHAN, AK KLEPEIS, JE VANSCHILFGAARDE, M METHFESSEL, M AF MCMAHAN, AK KLEPEIS, JE VANSCHILFGAARDE, M METHFESSEL, M TI BONDING IN THE MOLYBDENUM SILICIDES SO PHYSICAL REVIEW B LA English DT Article ID MUFFIN-TIN ORBITALS; ELECTRONIC-STRUCTURE; ELASTIC-CONSTANTS; BAND-STRUCTURE; ENERGY-BANDS; METAL DISILICIDES; 100 SILICON; MOSI2; WSI2; GROWTH AB Full-potential linear muffin-tin orbital calculations are reported for the bulk properties, density of states, and electron density in A2 Mo, A15 Mo3Si, D8(m) Mo5Si3, C11(b) MoSi2, and A4 Si. Both the magnitude and the directional anisotropy of the valence charge density associated with bonds in the three silicides suggest a hierarchy in bond strength, ordered from strongest to weakest: Mo-Mo, Mo-Si, and Si-Si. A combined Mulliken and tight-binding analysis shows this behavior to coincide with variations in occupation of the respective types of bonding states, which is ultimately traced to Mo(Bd) site energies that are nearly degenerate with the Fermi level, in contrast to Si(3p) site energies lying about 5 eV higher. These characteristics point to the dominance of Mo-Si bonding in C11(b) MoSi2, consistent with the near pd hybridization gap in this material, which appears to explain the unique position of the disilicide in systematics of the molybdenum silicide bulk properties. Finally, having identified the critical elements of the electronic structure in the molybdenum silicides, this work provides a physically motivated basis upon which to improve models used in the study of large-scale Mo-Si interface problems. C1 SRI INT,MENLO PK,CA 94025. INST HALBLEITERPHYS,D-15204 FRANKFURT,GERMANY. RP MCMAHAN, AK (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 83 TC 32 Z9 32 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 OCT 15 PY 1994 VL 50 IS 15 BP 10742 EP 10760 DI 10.1103/PhysRevB.50.10742 PG 19 WC Physics, Condensed Matter SC Physics GA PP124 UT WOS:A1994PP12400036 ER PT J AU ZAKHAROV, O RUBIO, A BLASE, X COHEN, ML LOUIE, SG AF ZAKHAROV, O RUBIO, A BLASE, X COHEN, ML LOUIE, SG TI QUASI-PARTICLE BAND STRUCTURES OF 6 II-VI-COMPOUNDS - ZNS, ZNSE, ZNTE, CDS, CDSE, AND CDTE SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; SEMICONDUCTORS; ENERGIES; STATES; GAAS; GAP AB Quasiparticle band structures of six II-VI compounds (ZnS, ZnSe, ZnTe, CdS, CdSe, and CdTe in the zinc-blende and wurtzite structures) are calculated using the GW approximation. Results for band structures, calculated using the ab initio pseudopotential method within the local-density approximation (LDA), are given along with the energies of the quasiparticle excitations at symmetry points. Comparisons are made with measured values and trends in the GW corrections to the LDA band structures are examined. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP ZAKHAROV, O (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Rubio, Angel/A-5507-2008 OI Rubio, Angel/0000-0003-2060-3151 NR 21 TC 243 Z9 250 U1 4 U2 55 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1994 VL 50 IS 15 BP 10780 EP 10787 DI 10.1103/PhysRevB.50.10780 PG 8 WC Physics, Condensed Matter SC Physics GA PP124 UT WOS:A1994PP12400039 ER PT J AU BISWAS, R ROOS, K TRINGIDES, MC AF BISWAS, R ROOS, K TRINGIDES, MC TI LOW-TEMPERATURE GROWTH ON SI(111) SUBSTRATES SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-DYNAMICS SIMULATION; ENERGY-ELECTRON-DIFFRACTION; SILICON STRUCTURAL ENERGIES; BY-LAYER GROWTH; SURFACE-DIFFUSION; ATOM DEPOSITION; FILMS; AG/SI(111); OSCILLATIONS; CONDENSATION AB Low-temperature (T < 150 K) reflection high-energy electron-diffraction (RHEED) oscillations during the growth of ultrathin films suggest the presence of nonzero adatom mobility. In most systems thermal diffusion cannot account for the observed oscillations, and the origin of the oscillations is still unclear. Experiments on Ag/Si(111) at 150 K demonstrate the absence of thermal diffusion based on the scaling of the RHEED intensity at different flux rates (i.e., the diffracted intensity is only a function of the total deposited amount independent of the flux rate). We have performed molecular-dynamics simulations to understand possible low-temperature mechanisms responsible for the oscillations. Classical two- and three-body Si potentials were used together with an adatom mass that is 3.84 times the Si mass to account for the Ag/Si mass ratio. Results indicate that the landing site of the adatom is important in predicting the subsequent lateral motion of the adatom. A majority (about 75%) of the deposited atoms adsorb within a lattice spacing of the landing site. However, a fraction (25%) of the deposited atoms eventually adsorb a few lattice spacings away from the landing site before equilibration to the substrate, but it is not clear if this is sufficient to account for the oscillations. The energy transfer to the substrate is much less efficient than in fcc/fcc systems, because of the stiffness of the Si-Si potentials. C1 IOWA STATE UNIV SCI & TECHNOL,MICROELECTR RES CTR,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. BRADLEY UNIV,DEPT PHYS,PEORIA,IL 61625. RP BISWAS, R (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 29 TC 3 Z9 3 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1994 VL 50 IS 15 BP 10932 EP 10940 DI 10.1103/PhysRevB.50.10932 PG 9 WC Physics, Condensed Matter SC Physics GA PP124 UT WOS:A1994PP12400059 ER PT J AU FANG, BS LO, WS CHIEN, TS LEUNG, TC LUE, CY CHAN, CT HO, KM AF FANG, BS LO, WS CHIEN, TS LEUNG, TC LUE, CY CHAN, CT HO, KM TI SURFACE BAND STRUCTURES ON NB(001) SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; PSEUDOPOTENTIAL CALCULATIONS; TRANSITION-METALS; FORCES; STATE; NB AB We report the joint studies of experimental and theoretical surface band structures of Nb(001). Angle-resolved photoelectron spectroscopy was used to determine surface-state dispersions along three high-symmetry axes ($$$) over bar Gamma M, ($$$) over bar Gamma X, and ($$$) over bar MX in the surface Brillouin zone. Ten surface bands have been identified. The experimental data are compared to self-consistent pseudopotential calculations for the ii-layer Nb(001) slabs that are either bulk terminated or fully relaxed (with a 12% contraction for the first interlayer spacing). The band calculations for a 12% surface-contracted slab are in better agreement with the experimental results than those for a bulk-terminated slab, except for a surface resonance near the Fermi level, which is related to the spin-orbit interaction. The charge profiles for all surface states or resonances have been calculated. Surface contraction effects on the charge-density distribution and the energy position of surface states and resonances will also be discussed. C1 NATL TSING HUA UNIV,DEPT PHYS,HSINCHU 300,TAIWAN. NATL CHUNG CHENG UNIV,DEPT PHYS,CHIAYI 621,TAIWAN. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,DEPT PHYS,AMES,IA 50011. RP FANG, BS (reprint author), SYNCHROTRON RADIAT RES CTR,DIV USERS,HSINCHU 300,TAIWAN. NR 27 TC 39 Z9 39 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1994 VL 50 IS 15 BP 11093 EP 11101 DI 10.1103/PhysRevB.50.11093 PG 9 WC Physics, Condensed Matter SC Physics GA PP124 UT WOS:A1994PP12400081 ER PT J AU AHUJA, R AULUCK, S SODERLIND, P ERIKSSON, O WILLS, JM JOHANSSON, B AF AHUJA, R AULUCK, S SODERLIND, P ERIKSSON, O WILLS, JM JOHANSSON, B TI FERMI-SURFACE OF NOBLE-METALS - FULL-POTENTIAL GENERALIZED-GRADIENT-APPROXIMATION CALCULATIONS SO PHYSICAL REVIEW B LA English DT Note ID CORRECTED DENSITY FUNCTIONALS; GROUND-STATE PROPERTIES; TRANSITION-METALS; BRILLOUIN-ZONE; SPECIAL POINTS; ENERGY; IRON; EXCHANGE; SOLIDS; BAND AB The Fermi surface (FS) of the noble metals has been studied theoretically in order to compare calculations based on a full-potential technique to calculations based on atomic-sphere approximation (ASA). Also, the effect of replacing the local-density approximation (LDA) with the generalized gradient approximation (GGA) for the exchange-correlation potential has been studied here. In the present work we have used the generalized gradient approximation derived by Perdew and Wang (PW91). We find that replacing the ASA with a full potential causes a larger modification of the calculated FS, compared to replacing the LDA with the GGA. Our calculations demonstrate that full-potential calculations combined with the LDA improve the FS of Cu and Ag relative to the results of the atomic-sphere approximation. If the full-potential method is combined with PW91 one obtains further improvements for these two metals. For Au, the full-potential calculations, based on LDA or GGA, do not give any improvement over results obtained from the atomic-sphere approximation. C1 UNIV ROORKEE, DEPT PHYS, ROORKEE 247667, UTTAR PRADESH, INDIA. UNIV ROORKEE, DEPT PHYS, ROORKEE 247667, UTTAR PRADESH, INDIA. LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. RP UPPSALA UNIV, DEPT PHYS, CONDENSED MATTER THEORY GRP, BOX 530, UPPSALA, SWEDEN. RI Eriksson, Olle/E-3265-2014 OI Eriksson, Olle/0000-0001-5111-1374 NR 38 TC 8 Z9 8 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 OCT 15 PY 1994 VL 50 IS 15 BP 11183 EP 11186 DI 10.1103/PhysRevB.50.11183 PG 4 WC Physics, Condensed Matter SC Physics GA PP124 UT WOS:A1994PP12400094 ER PT J AU XIA, X QUINN, JJ AF XIA, X QUINN, JJ TI EDGE MAGNETOPLASMONS OF 2-DIMENSIONAL ELECTRON-GAS SYSTEMS SO PHYSICAL REVIEW B LA English DT Note ID MULTIPOLE PLASMON MODES; SURFACE; FLUID AB Magnetoplasma modes localized near the edge of a two-dimensional electron gas with a nonabrupt edge density profile are investigated within a simple classical approximation. Two distinct groups of edge magnetoplasmons are found. The high-frequency modes occur only for finite values of the wave vector q along the edge; they are the higher multipole edge modes that occur when the magnetic field B=0. The low-frequency modes have frequencies omega(q) that approach zero as q approaches zero. They exist only for finite values of B and propagate in only one direction along the edge for a given direction of B. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP XIA, X (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. NR 17 TC 10 Z9 10 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1994 VL 50 IS 15 BP 11187 EP 11189 DI 10.1103/PhysRevB.50.11187 PG 3 WC Physics, Condensed Matter SC Physics GA PP124 UT WOS:A1994PP12400095 ER PT J AU BENNING, PJ OLSON, CG LYNCH, DW WEAVER, JH AF BENNING, PJ OLSON, CG LYNCH, DW WEAVER, JH TI BAND DISPERSION IN C-60(111) - AN ANGLE-RESOLVED PHOTOEMISSION-STUDY SO PHYSICAL REVIEW B LA English DT Note ID SOLID C60; ELECTRONIC-STRUCTURE; ORIENTATIONAL DISORDER; ALKALI-METAL; C-60; STATES; FULLERIDES; TRANSITION; DYNAMICS; VALENCE AB Angle-resolved photoemission studies of single-crystal C-60(111) films grown on GeS(001) reveal changes in valence feature line shape with emission angle and photon energy that are indicative of band dispersion. For an excitation energy (h nu) of 10 eV, normal emission spectra show four sharp structures within the similar to 1.1-eV-wide valence feature derived from the second highest molecular orbital (HOMO-1) of C-60. For h nu=8.1 eV, the 1-eV-wide HOMO-derived feature exhibits changes with emission angle mainly due to dispersion of 0.6 eV in the unoccupied bands. The distribution of electronic states underlying HOMO and HOMO -1 indicates that vibronic loss structures are not necessary to explain the width of these valence features. C1 UNIV MINNESOTA,DEPT MAT SCI & CHEM ENGN,MINNEAPOLIS,MN 55455. RP BENNING, PJ (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 22 TC 25 Z9 25 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1994 VL 50 IS 15 BP 11239 EP 11242 DI 10.1103/PhysRevB.50.11239 PG 4 WC Physics, Condensed Matter SC Physics GA PP124 UT WOS:A1994PP12400109 ER PT J AU PENG, JP LYNN, KG UMLOR, MT KEEBLE, DJ HARSHMAN, DR AF PENG, JP LYNN, KG UMLOR, MT KEEBLE, DJ HARSHMAN, DR TI VACANCY DEFECTS IN PHOTOEXCITED GAAS STUDIED BY POSITRON 2-DIMENSIONAL ANGULAR-CORRELATION OF ANNIHILATION RADIATION SO PHYSICAL REVIEW B LA English DT Note ID SEMIINSULATING GAAS; NATIVE VACANCIES; SEMICONDUCTORS; SPECTROSCOPY AB The positron two-dimensional angular correlation of annihilation radiation (2D-ACAR) technique has been coupled with optical excitation to study the native point defects in semi-insulating GaAs. The As vacancy was observed below similar to 170 K when illuminated with 1.41+/-0.07 eV photons. The temperature dependence of the 2D-ACAR spectra, with and without illumination, was studied. Data were also collected at 25 K as a function of the intensity of infrared light. The 2D-ACAR spectra reflect the e(+)-e(-) pair momentum distribution at or near the vacancy and provides symmetry and electronic structure information, which can be used as a unique defect signature for the vacancy. C1 MICHIGAN TECHNOL UNIV,DEPT PHYS,HOUGHTON,MI 49931. AT&T BELL LABS,MURRAY HILL,NJ 07974. RP PENG, JP (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Keeble, David /C-6633-2012 OI Keeble, David /0000-0002-5378-799X NR 21 TC 20 Z9 20 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1994 VL 50 IS 15 BP 11247 EP 11250 DI 10.1103/PhysRevB.50.11247 PG 4 WC Physics, Condensed Matter SC Physics GA PP124 UT WOS:A1994PP12400111 ER PT J AU LEN, PM THEVUTHASAN, S FADLEY, CS KADUWELA, AP VANHOVE, MA AF LEN, PM THEVUTHASAN, S FADLEY, CS KADUWELA, AP VANHOVE, MA TI ATOMIC IMAGING BY X-RAY-FLUORESCENCE HOLOGRAPHY AND ELECTRON-EMISSION HOLOGRAPHY - A COMPARATIVE THEORETICAL-STUDY SO PHYSICAL REVIEW B LA English DT Note ID ENERGY PHOTOELECTRON HOLOGRAPHY; WAVE; LEED AB We consider from a theoretical viewpoint the direct imaging of atoms at and near the surfaces of solids by both x-ray-fluorescence holography (XFH) and electron-emission holography (EEH). The more ideal nature of re-ray scattering makes XFH images superior to those in single-energy EEH. The overlap of real and twin features for pairs of atoms at ra can cause their XFH or EEH atomic images to cancel for certain combinations of wave vector and \a\ The relative merits of XFH and EEH for structure Studies are considered. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP LEN, PM (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. RI Van Hove, Michel/A-9862-2008; OI Van Hove, Michel/0000-0002-8898-6921; Kaduwela, Ajith/0000-0002-7236-2698 NR 21 TC 73 Z9 73 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1994 VL 50 IS 15 BP 11275 EP 11278 DI 10.1103/PhysRevB.50.11275 PG 4 WC Physics, Condensed Matter SC Physics GA PP124 UT WOS:A1994PP12400118 ER PT J AU JORDAN, RG LIU, Y QIU, SL GINATEMPO, B BRUNO, E STOCKS, GM SHELTON, WA AF JORDAN, RG LIU, Y QIU, SL GINATEMPO, B BRUNO, E STOCKS, GM SHELTON, WA TI ELECTRONIC-STRUCTURES OF DISORDERED AG-MG ALLOYS SO PHYSICAL REVIEW B LA English DT Article C1 UNIV MESSINA,DIPARTIMENTO FIS,I-98166 MESSINA,ITALY. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP JORDAN, RG (reprint author), FLORIDA ATLANTIC UNIV,DEPT PHYS,ALLOY RES CTR,BOCA RATON,FL 33431, USA. RI Bruno, Ezio/A-1019-2008; Stocks, George Malcollm/Q-1251-2016 OI Stocks, George Malcollm/0000-0002-9013-260X NR 17 TC 3 Z9 3 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1994 VL 50 IS 16 BP 11459 EP 11465 DI 10.1103/PhysRevB.50.11459 PG 7 WC Physics, Condensed Matter SC Physics GA PR434 UT WOS:A1994PR43400016 ER PT J AU RITTNER, JD FOILES, SM SEIDMAN, DN AF RITTNER, JD FOILES, SM SEIDMAN, DN TI SIMULATION OF SURFACE SEGREGATION FREE-ENERGIES SO PHYSICAL REVIEW B LA English DT Article ID EMBEDDED-ATOM-METHOD; NI-CU ALLOYS; BINARY SOLID-SOLUTIONS; ELECTRON-DIFFRACTION; SANDWICH SEGREGATION; GRAIN-BOUNDARIES; MODEL; MINIMIZATION; REVERSAL; METALS C1 NORTHWESTERN UNIV,MAT RES CTR,EVANSTON,IL 60208. SANDIA NATL LABS,DEPT COMPUTAT MAT SCI,LIVERMORE,CA 94551. RP RITTNER, JD (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 52 TC 40 Z9 41 U1 1 U2 10 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1994 VL 50 IS 16 BP 12004 EP 12014 DI 10.1103/PhysRevB.50.12004 PG 11 WC Physics, Condensed Matter SC Physics GA PR434 UT WOS:A1994PR43400082 ER PT J AU ZHOU, Y MANCINI, JD BOWEN, SP AF ZHOU, Y MANCINI, JD BOWEN, SP TI PARTITION-FUNCTIONS FOR STRONGLY CORRELATED FERMION SYSTEMS SO PHYSICAL REVIEW B LA English DT Note ID IMPURITY C1 ARGONNE NATL LAB,ARGONNE,IL 60439. FORDHAM UNIV,DEPT PHYS,BRONX,NY 10458. RP ZHOU, Y (reprint author), UNIV ZURICH,INST PHYS,SCHONBERGGASSE 9,CH-8057 ZURICH,SWITZERLAND. NR 17 TC 0 Z9 0 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1994 VL 50 IS 16 BP 12156 EP 12159 DI 10.1103/PhysRevB.50.12156 PG 4 WC Physics, Condensed Matter SC Physics GA PR434 UT WOS:A1994PR43400099 ER PT J AU LOSS, D MARTIN, T AF LOSS, D MARTIN, T TI WENTZEL-BARDEEN SINGULARITY AND PHASE-DIAGRAM FOR INTERACTING ELECTRONS COUPLED TO ACOUSTIC PHONONS IN ONE-DIMENSION SO PHYSICAL REVIEW B LA English DT Note ID HUBBARD-MODEL; LUTTINGER LIQUID; QUANTUM FLUIDS; 1 DIMENSION; FERMI GAS; CONDUCTORS; DYNAMICS; SUPERCONDUCTIVITY C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,DIV THEORET,LOS ALAMOS,NM 87545. RP LOSS, D (reprint author), SIMON FRASER UNIV,DEPT PHYS,BURNABY V5A 1S6,BC,CANADA. RI Loss, Daniel/A-3721-2008 OI Loss, Daniel/0000-0001-5176-3073 NR 32 TC 58 Z9 58 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1994 VL 50 IS 16 BP 12160 EP 12163 DI 10.1103/PhysRevB.50.12160 PG 4 WC Physics, Condensed Matter SC Physics GA PR434 UT WOS:A1994PR43400100 ER PT J AU MOSTOLLER, M CHISHOLM, MF KAPLAN, T AF MOSTOLLER, M CHISHOLM, MF KAPLAN, T TI EDGE-DISLOCATION INTERSECTIONS IN DIAMOND CUBIC-CRYSTALS SO PHYSICAL REVIEW B LA English DT Note ID ATOMIC-STRUCTURE; SILICON RP MOSTOLLER, M (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2008,OAK RIDGE,TN 37831, USA. NR 10 TC 3 Z9 3 U1 2 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1994 VL 50 IS 16 BP 12183 EP 12186 DI 10.1103/PhysRevB.50.12183 PG 4 WC Physics, Condensed Matter SC Physics GA PR434 UT WOS:A1994PR43400106 ER PT J AU WOICIK, JC FRANKLIN, GE LIU, C MARTINEZ, RE HWONG, IS BEDZYK, MJ PATEL, JR GOLOVCHENKO, JA AF WOICIK, JC FRANKLIN, GE LIU, C MARTINEZ, RE HWONG, IS BEDZYK, MJ PATEL, JR GOLOVCHENKO, JA TI STRUCTURAL DETERMINATION OF THE SI(111)-ROOT-3-X-ROOT-3-BI SURFACE BY X-RAY STANDING WAVES AND SCANNING-TUNNELING-MICROSCOPY SO PHYSICAL REVIEW B LA English DT Note ID ENERGY-ELECTRON-DIFFRACTION; 2 PHASES; RECONSTRUCTION; SB/SI(111); SILICON; BI C1 HARVARD UNIV,DEPT PHYS,CAMBRIDGE,MA 02138. NORTHWESTERN UNIV,DEPT MAT SCI,EVANSTON,IL 60208. ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV MUNICH,SEKT PHYS,D-80539 MUNICH,GERMANY. RP WOICIK, JC (reprint author), NIST,GAITHERSBURG,MD 20899, USA. RI Bedzyk, Michael/B-7503-2009; Bedzyk, Michael/K-6903-2013 NR 18 TC 13 Z9 13 U1 2 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1994 VL 50 IS 16 BP 12246 EP 12249 DI 10.1103/PhysRevB.50.12246 PG 4 WC Physics, Condensed Matter SC Physics GA PR434 UT WOS:A1994PR43400122 ER PT J AU CARR, BJ GILBERT, JH LIDSEY, JE AF CARR, BJ GILBERT, JH LIDSEY, JE TI BLACK-HOLE RELICS AND INFLATION - LIMITS ON BLUE PERTURBATION SPECTRA SO PHYSICAL REVIEW D LA English DT Article ID RADIOMETER 1ST-YEAR MAPS; EXTENDED INFLATION; DENSITY PERTURBATIONS; GRAVITATIONAL-WAVES; GRAND UNIFICATION; GRACEFUL EXIT; UNIVERSE; COBE; COSMOLOGY; EVAPORATION AB Blue primordial power spectra have spectral index n > 1 and arise naturally in the recently proposed hybrid inflationary scenario. An observational upper Limit op n is derived by normalizing the spectrum at the quadrupole scale and considering the possible overproduction of Planck mass relies formed in the final stage of primordial black hole evaporation. In the inflationary Universe with the maximum reheating temperature compatible with the observed quadrupole anisotropy, the upper limit is n = 1.4, but it is slightly weaker for lower reheat temperatures. This limit applies over 57 decades of mass and is therefore insensitive to cosmic variance and any gravitational wave contribution to the quadrupole anisotropy. It is also independent of the dark matter content of the Universe and therefore the bias parameter. In some circumstances, there maybe an extended dustlike phase between the end of inflation and reheating. In this case, primordial black holes form more abundantly and the upper limit is n = 1.3. C1 FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. RP CARR, BJ (reprint author), UNIV LONDON QUEEN MARY & WESTFIELD COLL,SCH MATH SCI,ASTRON UNIT,MILE END RD,LONDON E1 4NS,ENGLAND. NR 95 TC 179 Z9 180 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD OCT 15 PY 1994 VL 50 IS 8 BP 4853 EP 4867 DI 10.1103/PhysRevD.50.4853 PG 15 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PP250 UT WOS:A1994PP25000017 ER PT J AU SILVEIRA, V WAGA, I AF SILVEIRA, V WAGA, I TI DECAYING LAMBDA-COSMOLOGIES AND POWER SPECTRUM SO PHYSICAL REVIEW D LA English DT Article ID LARGE-SCALE STRUCTURE; COLD DARK MATTER; CONSTANT; MODELS; UNIVERSE; EVOLUTION; INFLATION; DENSITY; LAW AB We investigate the evolution of matter density perturbations in a universe with a cosmological term that decreases with time as Lambda alpha a(-m). For fixed values of Omega(m0) the power spectrum is constructed and we show that it is only slightly modified when the parameter m is changed from m = 0 to m = 2. Some properties concerning the peculiar velocity held are also discussed. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV FED RIO DE JANEIRO,INST FIS,BR-21943 RIO JANEIRO,BRAZIL. FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. RP SILVEIRA, V (reprint author), UNIV BRASILIA,DEPT FIS,BR-70910900 BRASILIA,DF,BRAZIL. RI Waga, Ioav/B-6288-2014 NR 27 TC 152 Z9 153 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD OCT 15 PY 1994 VL 50 IS 8 BP 4890 EP 4894 DI 10.1103/PhysRevD.50.4890 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PP250 UT WOS:A1994PP25000021 ER PT J AU FRIEMAN, JA HARARI, DD SURPI, GC AF FRIEMAN, JA HARARI, DD SURPI, GC TI GRAVITATIONAL LENS TIME DELAYS AND GRAVITATIONAL-WAVES SO PHYSICAL REVIEW D LA English DT Article ID FERMAT PRINCIPLE AB Using Fermat's principle, we analyze the effects of very long wavelength gravitational waves upon the images of a gravitationally lensed quasar. We show that the lens equation in the presence of gravity waves is equivalent to that of a lens with a different alignment between source, deflector, and observer in the absence of gravity waves. Contrary to a recent claim, we conclude that measurements of time delays in gravitational lenses cannot serve as a method to detect or constrain a stochastic background of gravitational waves of cosmological wavelengths, because the wave-induced time delay is observationally indistinguishable from an intrinsic time delay due to the lens geometry. C1 UNIV CHICAGO,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. UNIV BUENOS AIRES,FAC CIENCIAS EXACTAS & NAT,DEPT FIS,RA-1428 BUENOS AIRES,DF,ARGENTINA. RP FRIEMAN, JA (reprint author), FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,POB 500,BATAVIA,IL 60510, USA. NR 20 TC 14 Z9 14 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD OCT 15 PY 1994 VL 50 IS 8 BP 4895 EP 4902 DI 10.1103/PhysRevD.50.4895 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PP250 UT WOS:A1994PP25000022 ER PT J AU JACOB, OC AF JACOB, OC TI QUANTIZATION OF GAUGE FIELD-THEORIES ON THE FRONT FORM WITHOUT GAUGE CONSTRAINTS - THE ABELIAN CASE SO PHYSICAL REVIEW D LA English DT Article ID QCD AB Recently, we proposed a new front-form quantization which treated both the x(+) and the x(-) coordinates as front-form ''times.'' This quantization was found to preserve parity explicitly. In this paper we extend this construction to local Abelian gauge fields. We quantize this theory using a method proposed originally by Faddeev and Jackiw. We emphasize here the feature that quantizing along both x(+) and x(-) gauge theories does not require extra constraints (also known as ''gauge conditions'') to determine the solution uniquely. RP JACOB, OC (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 23 TC 7 Z9 7 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD OCT 15 PY 1994 VL 50 IS 8 BP 5289 EP 5295 DI 10.1103/PhysRevD.50.5289 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PP250 UT WOS:A1994PP25000057 ER PT J AU KURKISUONIO, H MATHEWS, GJ AF KURKISUONIO, H MATHEWS, GJ TI STATISTICAL CONSTRAINTS ON THE INFLATION EFFECTIVE POTENTIAL FROM THE COBE DMR RESULTS SO PHYSICAL REVIEW D LA English DT Note ID DIFFERENTIAL MICROWAVE RADIOMETER; COSMOLOGICAL PERTURBATIONS; GRAVITATIONAL-WAVES; CHAOTIC INFLATION; UNIVERSE MODELS; COSMIC VARIANCE; FLUCTUATIONS; ANISOTROPY; FIELD AB We explore constraints on various forms for the effective potential during inflation based upon a statistical comparison between inflation-generated fluctuations in the cosmic microwave background temperature and the COBE DMR results. Fits to the first year 53A + B x 90A + B cross correlation function using an effective potential of the form V(phi) = lambda phi(2)/x! yield upper limits of x less than or equal to 107 and x less than or equal to 397 at the 1 sigma and 2 sigma confidence levels, while the same analysis produces a power law of index of n = 1.10(-0.64)(+0.47) which would imply an underestimate of x less than or equal to 63 from the simple analytic relation between x and n. We also quantify new limits on the parameters for polynomial effective potentials. This work highlights the importance of a careful statistical treatment when seeking constraints on the inflation-generating effective potential. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP KURKISUONIO, H (reprint author), UNIV HELSINKI,THEORET PHYS RES INST,SF-00014 HELSINKI,FINLAND. RI Kurki-Suonio, Hannu/B-8502-2016 OI Kurki-Suonio, Hannu/0000-0002-4618-3063 NR 39 TC 7 Z9 7 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD OCT 15 PY 1994 VL 50 IS 8 BP 5431 EP 5434 DI 10.1103/PhysRevD.50.5431 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PP250 UT WOS:A1994PP25000077 ER PT J AU MOYA, JS GUITIAN, F TOMSIA, AP THOMAS, G AF MOYA, JS GUITIAN, F TOMSIA, AP THOMAS, G TI THE CONFERENCE SET ON INTERFACES - (PROCEEDINGS OF THE 2ND INTERNATIONAL WORKSHOP ON INTERFACES, SEPTEMBER 27-29, 1993, SANTIAGO, GALICIA, SPAIN) - INTRODUCTION SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Editorial Material C1 UNIV SANTIAGO DE COMPOSTELA,INST CERAM,SANTIAGO,SPAIN. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DIV MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP MOYA, JS (reprint author), CSIC,INST CERAM & VIDRIO,ARGANDA REY,MADRID 6,SPAIN. RI Moya, Jose/I-5841-2013 NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD OCT 15 PY 1994 VL 31 IS 8 BP 951 EP 951 DI 10.1016/0956-716X(94)90508-8 PG 1 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PA816 UT WOS:A1994PA81600001 ER PT J AU THOMAS, G AF THOMAS, G TI HIGH-RESOLUTION ANALYSES AND INTERFACIAL DESIGN OF INORGANIC MATERIALS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article; Proceedings Paper CT 2nd International Workshop on Interfaces CY SEP 27-29, 1993 CL SANTIAGO, SPAIN SP SPANISH NATL RES COUNCIL, REG GOVT GALICIA ID SILICON-NITRIDE CERAMICS; X-RAY-DIFFRACTION; PHASE CRYSTALLIZATION; ELECTRON-MICROSCOPY; STRENGTH; GLASS; BEHAVIOR; SI3N4; Y2O3; MICROSTRUCTURE C1 LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,BERKELEY,CA 94720. RP THOMAS, G (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. NR 38 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD OCT 15 PY 1994 VL 31 IS 8 BP 953 EP 958 DI 10.1016/0956-716X(94)90509-6 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PA816 UT WOS:A1994PA81600002 ER PT J AU LOEHMAN, RE AF LOEHMAN, RE TI CERAMIC-METAL REACTIONS IN COMPOSITES, CERAMIC JOINING, AND ELECTRONIC PACKAGING SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article; Proceedings Paper CT 2nd International Workshop on Interfaces CY SEP 27-29, 1993 CL SANTIAGO, SPAIN SP SPANISH NATL RES COUNCIL, REG GOVT GALICIA ID GLASS; CHROMIUM; ALN; TI RP LOEHMAN, RE (reprint author), SANDIA NATL LABS,ADV MAT LAB,ALBUQUERQUE,NM 87185, USA. NR 27 TC 6 Z9 6 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD OCT 15 PY 1994 VL 31 IS 8 BP 965 EP 970 DI 10.1016/0956-716X(94)90511-8 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PA816 UT WOS:A1994PA81600004 ER PT J AU MARSHALL, SJ MARSHALL, GW KINNEY, JH BALOOCH, M AF MARSHALL, SJ MARSHALL, GW KINNEY, JH BALOOCH, M TI DENTAL RESTORATIVE MATERIAL TOOTH INTERFACES SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article; Proceedings Paper CT 2nd International Workshop on Interfaces CY SEP 27-29, 1993 CL SANTIAGO, SPAIN SP SPANISH NATL RES COUNCIL, REG GOVT GALICIA ID AMALGAM RESTORATIONS; INTERDIFFUSION ZONE; REPLACEMENT; PLACEMENT; SURVIVAL; SYSTEMS C1 LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550. RP MARSHALL, SJ (reprint author), UNIV CALIF SAN FRANCISCO,DEPT RESTORAT DENT,DIV BIOMAT,SAN FRANCISCO,CA 94143, USA. NR 36 TC 1 Z9 1 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD OCT 15 PY 1994 VL 31 IS 8 BP 983 EP 988 DI 10.1016/0956-716X(94)90514-2 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PA816 UT WOS:A1994PA81600007 ER PT J AU TOMSIA, AP MOYA, JS GUITIAN, F AF TOMSIA, AP MOYA, JS GUITIAN, F TI NEW ROUTE FOR HYDROXYAPATITE COATINGS ON TI-BASED HUMAN IMPLANTS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article; Proceedings Paper CT 2nd International Workshop on Interfaces CY SEP 27-29, 1993 CL SANTIAGO, SPAIN SP SPANISH NATL RES COUNCIL, REG GOVT GALICIA C1 CSIC,INST CERAM & VIDRIO,MADRID 6,SPAIN. UNIV SANTIAGO DE COMPOSTELA,INST CERAM,SANTIAGO,SPAIN. RP TOMSIA, AP (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. RI Moya, Jose/I-5841-2013 NR 14 TC 11 Z9 11 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD OCT 15 PY 1994 VL 31 IS 8 BP 995 EP 1000 DI 10.1016/0956-716X(94)90516-9 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PA816 UT WOS:A1994PA81600009 ER PT J AU DALGLEISH, BJ TOMSIA, AP NAKASHIMA, K LOCATELLI, MR GLAESER, AM AF DALGLEISH, BJ TOMSIA, AP NAKASHIMA, K LOCATELLI, MR GLAESER, AM TI LOW-TEMPERATURE ROUTES TO JOINING CERAMICS FOR HIGH-TEMPERATURE APPLICATIONS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article; Proceedings Paper CT 2nd International Workshop on Interfaces CY SEP 27-29, 1993 CL SANTIAGO, SPAIN SP SPANISH NATL RES COUNCIL, REG GOVT GALICIA ID METALS; SAPPHIRE; ALUMINA C1 LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. RP DALGLEISH, BJ (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. NR 22 TC 28 Z9 30 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD OCT 15 PY 1994 VL 31 IS 8 BP 1043 EP 1048 DI 10.1016/0956-716X(94)90524-X PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PA816 UT WOS:A1994PA81600017 ER PT J AU DALGLEISH, BJ SAIZ, E TOMSIA, AP CANNON, RM RITCHIE, RO AF DALGLEISH, BJ SAIZ, E TOMSIA, AP CANNON, RM RITCHIE, RO TI INTERFACE FORMATION AND STRENGTH IN CERAMIC-METAL SYSTEMS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article; Proceedings Paper CT 2nd International Workshop on Interfaces CY SEP 27-29, 1993 CL SANTIAGO, SPAIN SP SPANISH NATL RES COUNCIL, REG GOVT GALICIA ID FRACTURE-RESISTANCE; ALUMINA; OXYGEN RP DALGLEISH, BJ (reprint author), LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720, USA. RI Ritchie, Robert/A-8066-2008 OI Ritchie, Robert/0000-0002-0501-6998 NR 33 TC 45 Z9 45 U1 0 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD OCT 15 PY 1994 VL 31 IS 8 BP 1109 EP 1114 DI 10.1016/0956-716X(94)90535-5 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA PA816 UT WOS:A1994PA81600028 ER PT J AU NILSEN, J ELLIOTT, SR BEIERSDORFER, P AF NILSEN, J ELLIOTT, SR BEIERSDORFER, P TI RESONANT PHOTOPUMPING OF NEON-LIKE COBALT WITH SODIUM LY-ALPHA RADIATION SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID X-RAY-LASER; HIGHLY CHARGED IONS; NICKEL-LIKE IONS; CROSS-SECTIONS; LINE OVERLAP; TRANSITIONS; PLASMA; ATOMS AB Measurements of the resonance between the Ly-alpha line of sodium and the 2s-->4p transition in neon-like cobalt are presented, which show a good resonance between cobalt and sodium. The cobalt line is measured at 10.0222 Angstrom + 1.1 m Angstrom, just 1 m Angstrom below the short wavelength component of the Ly-alpha sodium line. Results from model calculations are presented that show that this resonance can be used in experiments to study enhanced fluorescence due to photo-pumping and as part of a resonantly photo-pumped x-ray laser scheme which would lase on several 2p-->2s transitions near 83 Angstrom and 92 Angstrom in neon-like cobalt. RP NILSEN, J (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5508,LIVERMORE,CA 94550, USA. NR 30 TC 1 Z9 1 U1 1 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD OCT 14 PY 1994 VL 27 IS 19 BP 4523 EP 4529 DI 10.1088/0953-4075/27/19/014 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA PN011 UT WOS:A1994PN01100014 ER PT J AU PIEKSMA, M OVCHINNIKOV, SY AF PIEKSMA, M OVCHINNIKOV, SY TI THE VELOCITY DISTRIBUTION OF SADDLE-POINT ELECTRONS SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID IONIZING COLLISIONS; CROSS-SECTION; IONIZATION; H+; IMPACT; HE-2+ AB An approximate, analytic expression is derived for the distribution of saddle-point electrons emitted in ionizing one-electron atomic collision systems. The electron distributions of two other relevant ionization mechanisms, the direct S and the radial decoupling mechanisms, are also taken into account. The electron velocity distributions of 1-6 keV amu(-1) collisions of H+ and He2+ with atomic hydrogen are presented. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP PIEKSMA, M (reprint author), UNIV UTRECHT,DEBYE INST,DEPT ATOM & INTERFACE PHYS,POB 80000,3508 TA UTRECHT,NETHERLANDS. RI Ovchinnikov, Serguei/C-4994-2014; Institute (DINS), Debye/G-7730-2014 NR 25 TC 40 Z9 40 U1 1 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD OCT 14 PY 1994 VL 27 IS 19 BP 4573 EP 4593 DI 10.1088/0953-4075/27/19/018 PG 21 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA PN011 UT WOS:A1994PN01100018 ER PT J AU YU, YG KING, DS SHIN, YK AF YU, YG KING, DS SHIN, YK TI INSERTION OF A COILED-COIL PEPTIDE FROM INFLUENZA-VIRUS HEMAGGLUTININ INTO MEMBRANES SO SCIENCE LA English DT Article ID CONFORMATIONAL CHANGE; FUSION ACTIVITY; GLYCOPROTEIN; AGGREGATION; MUTANTS AB The trimeric protein hemagglutinin (HA) of the influenza viral envelope is essential for cell entry. To investigate the interaction of HA with membranes, two 40-residue, cysteine-substituted peptides comprising the loop region and the first part of the coiled-coil stem were synthesized and modified with a nitroxide spin label. Electron paramagnetic resonance analysis revealed that the peptide inserts reversibly into phospholipid vesicles under endosomal pH conditions. This result suggests that some or all of the long coiled-coil trimer of HA may insert into membranes, which could bring the viral and cell membranes closer together and facilitate fusion. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,HOWARD HUGHES MED INST,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. NR 19 TC 101 Z9 102 U1 6 U2 15 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD OCT 14 PY 1994 VL 266 IS 5183 BP 274 EP 276 DI 10.1126/science.7939662 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PM134 UT WOS:A1994PM13400033 PM 7939662 ER PT J AU LYKKE, KR PARKER, DH WURZ, P AF LYKKE, KR PARKER, DH WURZ, P TI SYNTHESIS, SEPARATION, CHARACTERIZATION, FRAGMENTATION, AND AGGREGATION OF GIANT FULLERENES SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES LA English DT Article DE FULLERENES; GIANT FULLERENES; LASER-DESORPTION MASS SPECTROMETRY ID MASS-SPECTROMETRIC CHARACTERIZATION; CARBON CLUSTERS; COALESCENCE REACTIONS; SOLID C-60; EXTRACTION; IONIZATION; MOLECULES AB We have performed mass spectrometric studies of giant fullerenes. These fullerenes consist of even-numbered closed carbon shells and have been extracted from carbon soot produced in a carbon-are source. By utilizing designed extraction techniques, the mass distributions can be made to peak near m/z approximate to 2500 u. The distributions are studied using laser-desorption mass spectrometry (time-of-flight and Fourier transform), detecting positive ions, negative ions, and neutral molecules. The neutral species are detected using UV multiphoton ionization and VUV single-photon ionization of laser-desorbed species. Additionally, giant fullerenes can be prepared selectively in the gas phase by laser desorption of phase-pure C-60. The results of the present study are compared with previous mass spectrometry experiments of giant fullerenes. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP LYKKE, KR (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 27 TC 8 Z9 8 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 OCT 13 PY 1994 VL 138 BP 149 EP 157 DI 10.1016/0168-1176(94)04055-9 PG 9 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA PW201 UT WOS:A1994PW20100012 ER PT J AU HETTICH, R JIN, CM COMPTON, R AF HETTICH, R JIN, CM COMPTON, R TI DETERMINATION OF THE ELECTRON-AFFINITIES OF FLUORINATED FULLERENES (C60F44,46, C70F52,54) BY FOURIER-TRANSFORM MASS-SPECTROMETRY SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES LA English DT Article DE ELECTRON AFFINITIES; FLUORINATED FULLERENES; FOURIER TRANSFORM MASS SPECTROMETRY; FULLERENES ID C60F60; C-60; BUCKMINSTERFULLERENE; C60H60; CARBON AB Negative ion charge exchange reactions in a Fourier transform mass spectrometer were used to ''bracket'' the electron affinities of the fluorinated fullerenes C-60 F-x (X = 44, 46) and C70Fy (y = 52, 54). By monitoring the occurrence of charge exchange reactions between negative ions and gas phase neutrals of fluorinated fullerenes and a variety of reagents, electron affinities were determined to be EA(C60F44,46) = 4.06 +/- 0.25 eV and EA(C70F52,54) = 4.06 +/- 0.25 eV. These results indicate that fluorination at this level increases the electron affinities of these fullerene derivatives by almost 1.5eV. It was also determined that the electron affinity of C70Fy (y = 52, 54) is slightly greater than that for C60Fx (x = 44, 46), which may be related to the higher number of substituted fluorines and/or the fact that the EA(C-70) is also known to be greater than EA(C-60). RP HETTICH, R (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Hettich, Robert/N-1458-2016 OI Hettich, Robert/0000-0001-7708-786X NR 25 TC 24 Z9 25 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1176 J9 INT J MASS SPECTROM JI Int. J. Mass Spectrom. Ion Process. PD OCT 13 PY 1994 VL 138 BP 263 EP 274 DI 10.1016/0168-1176(94)04059-1 PG 12 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA PW201 UT WOS:A1994PW20100019 ER PT J AU THOMPSON, MA GLENDENING, ED FELLER, D AF THOMPSON, MA GLENDENING, ED FELLER, D TI THE NATURE OF K+ CROWN-ETHER INTERACTIONS - A HYBRID QUANTUM MECHANICAL-MOLECULAR MECHANICAL STUDY SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ROTATIONAL ISOMERIC STATES; ALKALI-METAL CATIONS; FREE-ENERGY; CROWN-ETHERS; SEMIEMPIRICAL METHODS; GAS-PHASE; DYNAMICS SIMULATIONS; POTENTIAL FUNCTIONS; AQUEOUS-SOLUTION; MNDO MODEL AB We present a hybrid quantum mechanical/molecular mechanical (QM/MM) molecular dynamics study of dimethyl ether (DME) and 18-crown-6 (18c6) interacting with K+. The QM/MM method employs the semiempirical AM1 method to describe the ethers, the MM parametrization of Dang for K+, and the MM SPC/e model for H2O. We parametrize the interaction Hamiltonian to the binding energies and optimized geometries for K+/DME using ab initio HF and MP2/6-31+G* results. The resulting QM/MM model describes the polarization response of both free DME and K+-complexed DME well. The QM/MM model gives good agreement with the experimental and ab initio structures for K+/18c6. We calculate gas-phase K+/18c6 binding energies of -70.2 and -72.0 kcal/mol with the QM/MM and MP2/6-31+G* (CP corrected) methods, respectively. Our simulation results for K+/18c6 in H2O show that the most probable K+/18c6 center-of-mass displacement is 0.25 Angstrom, in marked contrast to previous molecular dynamics results of Dang and Kollman. Our result is consistent with K+ having an optimal ''fit'' for the cavity of 18c6. Still, we find that K+ retains significant solvent accessibility coordinating two H2O molecules, on average, in the K+/18c6 simulation. The simulation average polarization energy for 18c6 interacting with both K+ and the H2O solvent is -14.9 kcal/mol, which is 17% of the total electrostatic interaction energy. This result underscores the potential importance of QM in describing the solution chemistry of ion-macrocycle interactions. Our study is the first simulation of crown ethers that explicitly incorporates QM in the force field. RP THOMPSON, MA (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 81 TC 165 Z9 165 U1 1 U2 15 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD OCT 13 PY 1994 VL 98 IS 41 BP 10465 EP 10476 DI 10.1021/j100092a015 PG 12 WC Chemistry, Physical SC Chemistry GA PL691 UT WOS:A1994PL69100015 ER PT J AU MEZYK, SP BARTELS, DM AF MEZYK, SP BARTELS, DM TI RATE-CONSTANT AND ACTIVATION-ENERGY MEASUREMENT FOR THE REACTION OF ATOMIC-HYDROGEN WITH METHANOL, IODOMETHANE, IODOETHANE, AND 1-IODOPROPANE IN AQUEOUS-SOLUTION SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID HYDRATED ELECTRONS; PULSE-RADIOLYSIS; WATER RADIOLYSIS; SOLVENT; BENZENE AB The Arrhenius parameters for the reaction of hydrogen atoms with methanol in aqueous solution have been determined by use of pulse radiolysis and electron paramagnetic resonance free induction decay attenuation measurements. At 25.5 degrees C, an absolute scavenging rate constant of (2.84 +/- 0.07) x 10(6) dm(3) mol(-1) s(-1) has been measured, and over the temperature range 10.2-86.4 degrees C, an activation energy of 29.4 +/- 0.8 kJ mol(-1) has been determined. These values have been used to make minor corrections to rate constant and activation energy values for the reaction of aqueous hydrogen atoms with iodomethane, iodoethane, and 1-iodopropane. For these three compounds at 24.3 degrees C, rate constants of (1.17 +/- 0.07) x 10(10), (1.39 +/- 0.05) x 10(10), and (1.42 +/- 0.06) x 10(10) dm(3) mol(-1) s(-1) and corresponding activation energies of 10.4 +/- 0.4, 11.8 +/- 0.4, and 11.9 +/- 0.4 kJ mol(-1) have been respectively calculated over the temperature range 9-52 degrees C. These fast reaction rate constants and the similarity of the activation energies suggest that the mechanism of reaction for all these iodoalkane scavengers is dominated by halogen abstraction, H-. + RI --> H+ + I- + (.)R. Comparison of the methanol scavenging rate to gas phase results suggests that tunneling which contributes to the gas phase reaction may be quenched in aqueous solution. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP MEZYK, SP (reprint author), ATOM ENERGY CANADA LTD,WHITESHELL LABS,RES CHEM BRANCH,PINAWA R0E 1L0,MB,CANADA. NR 44 TC 23 Z9 23 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD OCT 13 PY 1994 VL 98 IS 41 BP 10578 EP 10583 DI 10.1021/j100092a031 PG 6 WC Chemistry, Physical SC Chemistry GA PL691 UT WOS:A1994PL69100031 ER PT J AU GOURLEY, PL AF GOURLEY, PL TI MICROSTRUCTURED SEMICONDUCTOR LASERS FOR HIGH-SPEED INFORMATION-PROCESSING SO NATURE LA English DT Review ID SURFACE-EMITTING LASERS; HIGH-EFFICIENCY; ROOM-TEMPERATURE; CONTINUOUS-WAVE; PERIODIC GAIN; INTERFERENCE FILTERS; OPTICAL BISTABILITY; THRESHOLD CURRENT; LASING THRESHOLD; BAND-STRUCTURE AB The technology to generate laser light from semiconductor microstructures is developing rapidly. New techniques for epitaxial growth and surface processing allow great flexibility in laser architecture. Highly efficient lasers with submicrometre dimensions, operating independently or packed together in dense two-dimensional arrays, will soon be used for transmitting, storing and manipulating information with unprecedented speed. RP GOURLEY, PL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 69 TC 43 Z9 43 U1 1 U2 7 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD OCT 13 PY 1994 VL 371 IS 6498 BP 571 EP 577 DI 10.1038/371571a0 PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PL559 UT WOS:A1994PL55900042 ER PT J AU ABBOTT, T AKIBA, Y ALBURGER, D BEAVIS, D BEERY, P BLOOMER, MA BOND, PD CHASMAN, C CHEN, Z CHU, YY COLE, BA COSTALES, JB CRAWFORD, HJ CUMMING, JB DEBBE, R DUEK, E ENGELAGE, J FUNG, SY GRODZINS, L GUSHUE, S HAMAGAKI, H HANSEN, O HAUSTEIN, P HOMMA, S HUANG, HZ IKEDA, Y KANG, J KATCOFF, S KAUFMAN, S LEDOUX, RJ LEVINE, MJ LINDSTROM, PJ MIAKE, Y MORSE, RJ NAGAMIYA, S OLNESS, J PARSONS, CG REMSBERG, LP SAKURAI, H SARABURA, M SETO, R STEADMAN, SG STEPHANS, GSF SUGITATE, T TANAKA, M TANNENBAUM, MJ TORIKOSHI, M VANDIJK, JH VIDEBAEK, F VIENT, M VINCENT, P VULGARIS, E VUTSADAKIS, V WATSON, WA WEGNER, HE WOODRUFF, DS ZAJC, WA AF ABBOTT, T AKIBA, Y ALBURGER, D BEAVIS, D BEERY, P BLOOMER, MA BOND, PD CHASMAN, C CHEN, Z CHU, YY COLE, BA COSTALES, JB CRAWFORD, HJ CUMMING, JB DEBBE, R DUEK, E ENGELAGE, J FUNG, SY GRODZINS, L GUSHUE, S HAMAGAKI, H HANSEN, O HAUSTEIN, P HOMMA, S HUANG, HZ IKEDA, Y KANG, J KATCOFF, S KAUFMAN, S LEDOUX, RJ LEVINE, MJ LINDSTROM, PJ MIAKE, Y MORSE, RJ NAGAMIYA, S OLNESS, J PARSONS, CG REMSBERG, LP SAKURAI, H SARABURA, M SETO, R STEADMAN, SG STEPHANS, GSF SUGITATE, T TANAKA, M TANNENBAUM, MJ TORIKOSHI, M VANDIJK, JH VIDEBAEK, F VIENT, M VINCENT, P VULGARIS, E VUTSADAKIS, V WATSON, WA WEGNER, HE WOODRUFF, DS ZAJC, WA TI INTERMITTENCY IN CENTRAL COLLISIONS OF O-16+A AT 14.6A GEV/C SO PHYSICS LETTERS B LA English DT Article ID HEAVY-ION EXPERIMENTS; HIGH-ENERGY; RAPIDITY DISTRIBUTIONS; MOMENTS; NUCLEI AB Fluctuations in pseudorapidity distributions of charged particles from central collisions of O-16 + Al and O-16+Cu at 14.6A GeV/c are analyzed using scaled factorial moments. A power-law growth of moments with decreasing bin size is observed down to delta eta approximately 0.1. About half the measured signal remains after making corrections based on Monte Carlo calculations with Fritiof and GEANT which include gamma-conversions, Dalitz decays and detector effects. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV CALIF BERKELEY,DONNER LAB,SPACE SCI LAB,BERKELEY,CA 94720. COLUMBIA UNIV,NEW YORK,NY 10027. HIROSHIMA UNIV,HIROSHIMA 730,JAPAN. UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92507. NEVIS LABS,IRVINGTON,NY 10533. UNIV TOKYO,INST NUCL STUDY,TANASHI,TOKYO 188,JAPAN. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV TOKYO,DEPT PHYS,TOKYO 113,JAPAN. MIT,CAMBRIDGE,MA 02139. RI seto, richard/G-8467-2011; Duek, Eliana/J-2499-2012; Cumming, James/I-3358-2013; SAKURAI, HIROYOSHI/G-5085-2014; HAMAGAKI, HIDEKI/G-4899-2014; OI Cumming, James/0000-0001-6930-0958; Tannenbaum, Michael/0000-0002-8840-5314 NR 17 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD OCT 13 PY 1994 VL 337 IS 3-4 BP 254 EP 260 DI 10.1016/0370-2693(94)90972-5 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PL953 UT WOS:A1994PL95300004 ER PT J AU AGLIETTA, M ALESSANDRO, B ANTONIOLI, P ARNEODO, F BERGAMASCO, L BERTAINA, M FAUTH, AC CASTAGNOLI, C CASTELLINA, A CATTADORI, C CHIAVASSA, A CINI, G PIAZZOLI, BD DISCIASCIO, G FULGIONE, W GALEOTTI, P GHIA, PL IACOVACCI, M MANNOCCHI, G MELAGRANA, C MORELLO, C NAVARRA, G RICCATI, L SAAVEDRA, O TRINCHERO, GC VALLANIA, P VERNETTO, S AHLEN, S AMBROSIO, M ANTOLINI, R AURIEMMA, G BAKER, R BALDINI, A BARBARINO, GC BARISH, BC BATTISTONI, G BELLOTTI, R BEMPORAD, C BERNARDINI, P BILOKON, H BISI, V BLOISE, C BOWER, C BUSSINO, S CAFAGNA, F CALICCHIO, M CAMPANA, D CARBONI, M CECCHINI, S CEI, F CHIARELLA, V CORMACK, R CORONA, A COUTU, S DECATALDO, G DEKHISSI, H DEMARZO, C DEMITRI, L DEVINCENZI, M DICREDICO, A DIEHL, E ERRIQUEZ, O FAVUZZI, C FICENEC, D FORTI, C FUSCO, P GIACOMELLI, G GIANNINI, G GIGLIETTO, N GORETTI, M GRASSI, M GREEN, P GRILLO, A GUARINO, F GUARNACCIA, P GUSTAVINO, C HABIG, A HANSON, K HEINZ, R HONG, JT IAROCCI, E KATSAVOUNIDIS, E KEARNS, E KLEIN, S KYRIAZOPOULOU, S LAMANNA, E LANE, C LEVIN, DS LIPARI, P LIU, G LIU, R LONGO, MJ LU, Y LUDLAM, G MANCARELLA, G MANDRIOLI, G MARGIOTTANERI, A MARIN, A MARINI, A MARTELLO, D CHIESA, AM MATTEUZZI, P MAZZIOTTA, MN MICHAEL, DG MIKHEYEV, S MILLER, L MITTELBRUN, M MONACELLI, P MONTARULI, T MONTENO, M MUFSON, S MUSSER, J NICOLO, D NOLTY, R NUTTER, S OKADA, C OSTERIA, G PALAMARA, O PARLATI, S PATERA, V PATRIZII, L PAVESI, B PAZZI, R PECK, CW PETRAKIS, J PETRERA, S PIGNATANO, ND PISTILLI, P RAINO, A REYNOLDSON, J RONGA, F SANZANI, G SANZGIRI, A SARTOGO, F SATRIANO, C SATTA, L SCAPPARONE, E SCHOLBERG, K SCIUBBA, A LUGARESI, PS SEVERI, M SITTA, M SPINELLI, P SPINETTI, M SPURIO, M STEELE, J STEINBERG, R STONE, JL SULAK, LR SURDO, A TARLE, G TOGO, V VALENTE, V WALTER, CW WEBB, R WORSTELL, W AF AGLIETTA, M ALESSANDRO, B ANTONIOLI, P ARNEODO, F BERGAMASCO, L BERTAINA, M FAUTH, AC CASTAGNOLI, C CASTELLINA, A CATTADORI, C CHIAVASSA, A CINI, G PIAZZOLI, BD DISCIASCIO, G FULGIONE, W GALEOTTI, P GHIA, PL IACOVACCI, M MANNOCCHI, G MELAGRANA, C MORELLO, C NAVARRA, G RICCATI, L SAAVEDRA, O TRINCHERO, GC VALLANIA, P VERNETTO, S AHLEN, S AMBROSIO, M ANTOLINI, R AURIEMMA, G BAKER, R BALDINI, A BARBARINO, GC BARISH, BC BATTISTONI, G BELLOTTI, R BEMPORAD, C BERNARDINI, P BILOKON, H BISI, V BLOISE, C BOWER, C BUSSINO, S CAFAGNA, F CALICCHIO, M CAMPANA, D CARBONI, M CECCHINI, S CEI, F CHIARELLA, V CORMACK, R CORONA, A COUTU, S DECATALDO, G DEKHISSI, H DEMARZO, C DEMITRI, L DEVINCENZI, M DICREDICO, A DIEHL, E ERRIQUEZ, O FAVUZZI, C FICENEC, D FORTI, C FUSCO, P GIACOMELLI, G GIANNINI, G GIGLIETTO, N GORETTI, M GRASSI, M GREEN, P GRILLO, A GUARINO, F GUARNACCIA, P GUSTAVINO, C HABIG, A HANSON, K HEINZ, R HONG, JT IAROCCI, E KATSAVOUNIDIS, E KEARNS, E KLEIN, S KYRIAZOPOULOU, S LAMANNA, E LANE, C LEVIN, DS LIPARI, P LIU, G LIU, R LONGO, MJ LU, Y LUDLAM, G MANCARELLA, G MANDRIOLI, G MARGIOTTANERI, A MARIN, A MARINI, A MARTELLO, D CHIESA, AM MATTEUZZI, P MAZZIOTTA, MN MICHAEL, DG MIKHEYEV, S MILLER, L MITTELBRUN, M MONACELLI, P MONTARULI, T MONTENO, M MUFSON, S MUSSER, J NICOLO, D NOLTY, R NUTTER, S OKADA, C OSTERIA, G PALAMARA, O PARLATI, S PATERA, V PATRIZII, L PAVESI, B PAZZI, R PECK, CW PETRAKIS, J PETRERA, S PIGNATANO, ND PISTILLI, P RAINO, A REYNOLDSON, J RONGA, F SANZANI, G SANZGIRI, A SARTOGO, F SATRIANO, C SATTA, L SCAPPARONE, E SCHOLBERG, K SCIUBBA, A LUGARESI, PS SEVERI, M SITTA, M SPINELLI, P SPINETTI, M SPURIO, M STEELE, J STEINBERG, R STONE, JL SULAK, LR SURDO, A TARLE, G TOGO, V VALENTE, V WALTER, CW WEBB, R WORSTELL, W TI STUDY OF THE PRIMARY COSMIC-RAY COMPOSITION AROUND THE KNEE OF THE ENERGY-SPECTRUM SO PHYSICS LETTERS B LA English DT Article ID DEEP-UNDERGROUND MUONS; GRAN-SASSO; MACRO DETECTOR; EAS-TOP; CASCADES AB A study of the primary cosmic ray composition in the energy range 5.10(14)-5.10(15) eV is performed through the analysis of the deep underground muons and of the e.m. component of Extensive Air Showers detected in coincidence by the MACRO and EAS-TOP experiments at the Gran Sasso Laboratory. We conclude that: a) pure proton and Iron primary beams are excluded by the experimental data; b) a fraction of nuclei heavier than Helium is necessary to explain the experimental data both below and above the knee; c) a mixed composition, obtained a priori from extrapolations of the spectra directly measured below 100 TeV, yields a reasonable account of the observations up to the knee of the primary spectrum. C1 INFN,I-70126 BARI,ITALY. UNIV BARI,DIPARTIMENTO FIS,I-70124 BARI,ITALY. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. CALTECH,PASADENA,CA 91125. DREXEL UNIV,DEPT PHYS,PHILADELPHIA,PA 19104. UNIV LAQUILA,DIPARTIMENTO FIS,I-67100 LAQUILA,ITALY. INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47401. INDIANA UNIV,DEPT ASTRON,BLOOMINGTON,IN 47401. UNIV LECCE,DIPARTIMENTO FIS,I-73100 LECCE,ITALY. UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109. UNIV NAPLES,DIPARTIMENTO FIS,I-80125 NAPLES,ITALY. INFN,I-56010 PISA,ITALY. TEXAS A&M UNIV,DEPT PHYS,COLLEGE STN,TX 77843. INFN,I-40126 BOLOGNA,ITALY. BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215. INFN,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. INFN,LAB NAZL GRAN SASSO,I-67010 ASSERGI,ITALY. INFN,I-67100 LAQUILA,ITALY. INFN,I-73100 LECCE,ITALY. INFN,I-80125 NAPLES,ITALY. UNIV PISA,DIPARTIMENTO FIS,I-56010 PISA,ITALY. INFN,I-00185 ROME,ITALY. UNIV ROME,DIPARTIMENTO FIS,I-00185 ROME,ITALY. INFN,I-10125 TURIN,ITALY. CNR,IST COSMOGEOFIS,I-10133 TURIN,ITALY. INFN,SEZ MILANO,I-20133 MILAN,ITALY. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. UNIV TURIN,IST FIS,I-10125 TURIN,ITALY. UNIV DELAWARE,BARTOL RES INST,NEWARK,DE 19718. RP AGLIETTA, M (reprint author), INFN,SEZ MILANO,I-20133 MILAN,ITALY. RI Guarino, Fausto/I-3166-2012; gustavino, carlo/K-4355-2015; Chiavassa, Andrea/A-7597-2012; Fauth, Anderson/F-9570-2012; Spurio, Maurizio/G-4170-2012; fulgione, walter/I-5232-2012; giglietto, nicola/I-8951-2012; Cafagna, Francesco/A-9299-2010; Arneodo, Francesco/B-8076-2013; Lamanna, Ernesto/C-7658-2012; Barbarino, Giancarlo/L-2559-2015; Martello, Daniele/J-3131-2012; Fulgione, Walter/C-8255-2016; Mazziotta, Mario /O-8867-2015; Cei, Fabrizio/M-8891-2016; OI cattadori, carla maria/0000-0001-7885-6253; Aglietta, Marco/0000-0001-8354-5388; Castellina, Antonella/0000-0002-0045-2467; Guarino, Fausto/0000-0003-1427-9885; Bellotti, Roberto/0000-0003-3198-2708; gustavino, carlo/0000-0003-3232-7027; Vernetto, Silvia Teresa/0000-0001-7270-7556; Vallania, Piero/0000-0001-9089-7875; Fauth, Anderson/0000-0001-7239-0288; giglietto, nicola/0000-0002-9021-2888; Cafagna, Francesco/0000-0002-7450-4784; Arneodo, Francesco/0000-0002-1061-0510; Lamanna, Ernesto/0000-0002-7844-8230; Barbarino, Giancarlo/0000-0001-9253-3397; Martello, Daniele/0000-0003-2046-3910; Fulgione, Walter/0000-0002-2388-3809; Mazziotta, Mario /0000-0001-9325-4672; Cei, Fabrizio/0000-0002-8313-3540; Sciubba, Adalberto/0000-0002-3301-9176; Monteno, Marco/0000-0002-3521-6333; ERRIQUEZ, Onofrio/0000-0002-9784-6568; Carboni, Massimo/0000-0003-4296-3799; Bertaina, Mario Edoardo/0000-0003-1069-1397; Petrera, Sergio/0000-0002-6029-1255; Coutu, Stephane/0000-0003-2923-2246 NR 23 TC 38 Z9 38 U1 0 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD OCT 13 PY 1994 VL 337 IS 3-4 BP 376 EP 382 DI 10.1016/0370-2693(94)90991-1 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA PL953 UT WOS:A1994PL95300023 ER PT J AU FUJITA, E HAFF, J SANZENBACHER, R ELIAS, H AF FUJITA, E HAFF, J SANZENBACHER, R ELIAS, H TI HIGH ELECTROCATALYTIC ACTIVITY OF RRSS-[NI(II)HTIM](CLO4)(2) AND [NI(II)DMC](CLO4)(2) FOR CARBON-DIOXIDE REDUCTION (HTIM=2,3,9,10-TETRAMETHYL-1,4,8,11-TETRAAZACYCLOTETRADECANE, DMC=C-MESO-5,12-DIMETHYL-1,4,8,11-TETRAAZACYCLOTETRADECANE) SO INORGANIC CHEMISTRY LA English DT Note ID NICKEL(II) CYCLAM; PHOTOCHEMICAL REDUCTION; COBALT(I) MACROCYCLE; AQUEOUS-SOLUTIONS; CO2; COMPLEXES; BINDING; MERCURY; WATER; 1,4,8,11-TETRAAZACYCLOTETRADECANE AB The electrocatalytic activity in aqueous solution and the CO2 binding in acetonitrile were studied for NiDMC(ClO4)(2) and isomerically pure RRSS- and RSSR-NiHTIM-(ClO4)(2). Cyclic voltammograms and bulk electrolyses indicate that RRSS-NiHTIM(2+) and NiDMC(2+) are better catalysts than Ni(cyclam)2+. The CO2 binding constants of the two complexes are estimated to be 4 +/- 2 M(-1) in CH3CN. C1 TH DARMSTADT,EDUARD ZINTL INST ANORGAN CHEM,D-64289 DARMSTADT,GERMANY. RP FUJITA, E (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,POB 5000,UPTON,NY 11973, USA. RI Fujita, Etsuko/D-8814-2013 NR 28 TC 65 Z9 65 U1 2 U2 17 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD OCT 12 PY 1994 VL 33 IS 21 BP 4627 EP 4628 DI 10.1021/ic00099a011 PG 2 WC Chemistry, Inorganic & Nuclear SC Chemistry GA PM685 UT WOS:A1994PM68500011 ER PT J AU BANSCH, B MEIER, M MARTINEZ, P VANELDIK, R SU, C SUN, J ISIED, SS WISHART, JF AF BANSCH, B MEIER, M MARTINEZ, P VANELDIK, R SU, C SUN, J ISIED, SS WISHART, JF TI MECHANISTIC INFORMATION FROM THE FIRST VOLUME PROFILE ANALYSIS FOR A REVERSIBLE INTERMOLECULAR ELECTRON-TRANSFER REACTION INVOLVING PENTAAMMINE(ISONICOTINAMIDE)RUTHENIUM AND CYTOCHROME-C SO INORGANIC CHEMISTRY LA English DT Article ID HIGH-PRESSURE; AQUEOUS-SOLUTION; IONIC-STRENGTH; ACTIVATION; KINETICS; DEPENDENCE; COMPLEXES; TEMPERATURE; REDUCTION AB The reversible intermolecular electron-transfer reaction between pentaammine(isonicotinamide)ruthenium(II/III) and horse-heart cytochrome c iron(III/II) was subjected to a detailed kinetic and thermodynamic study as a function of temperature and pressure. Theoretical calculations based on the Marcus-Hush theory were employed to predict all rate and equilibrium constants as well as activation parameters. There is an excellent agreement between the kinetically and thermodynamically determined equilibrium constants and associated pressure parameters. These data are used to construct a volume profile for the overall process, from which it follows that the transition state lies halfway between the reactant and product states on a volume basis. The reorganization in the transition state has reached a similar degree in both directions of the electron-transfer process and corresponds to a lambda(double dagger) value of 0.44 for this reversible reaction. This is the first complete volume profile analysis for a reversible intermolecular electron-transfer reaction. C1 UNIV WITTEN HERDECKE,INST INORGAN CHEM,W-5810 WITTEN,GERMANY. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RUTGERS STATE UNIV,DEPT CHEM,NEW BRUNSWICK,NJ 08903. RI Wishart, James/L-6303-2013 OI Wishart, James/0000-0002-0488-7636 NR 35 TC 25 Z9 25 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 OCT 12 PY 1994 VL 33 IS 21 BP 4744 EP 4749 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA PM685 UT WOS:A1994PM68500027 ER PT J AU THUNDAT, T ALLISON, DP WARMACK, RJ AF THUNDAT, T ALLISON, DP WARMACK, RJ TI STRETCHED DNA STRUCTURES OBSERVED WITH ATOMIC-FORCE MICROSCOPY SO NUCLEIC ACIDS RESEARCH LA English DT Article ID DEOXYRIBONUCLEIC-ACID; MOLECULES; STRANDS; MICA; AIR AB Double-stranded DNA molecules are occasionally found that appear to be straightened and stretched in atomic force microscope (AFM) images. Usually pBS(+) plasmid and lambda DNA show relaxed structures with bends and kinks along the strands and have measured contour lengths consistent to about 5 - 7%; they also appear not to cross over each other, except in very high concentrations. The anomalous molecules observed here, compared with the majority of molecules in the preparation, show contour lengths increased by as much as 80% and have measured heights of about half that of normal relaxed DNA. Some molecules also appear to be in transition between stretched and relaxed forms. These observations are consistent with an uncoiling of the DNA helix without breakage of the covalent bonds in the deoxyribose-phosphate backbone. RP THUNDAT, T (reprint author), OAK RIDGE NATL LAB,DIV HLTH SCI RES,OAK RIDGE,TN 37831, USA. NR 20 TC 100 Z9 100 U1 0 U2 16 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD OCT 11 PY 1994 VL 22 IS 20 BP 4224 EP 4228 DI 10.1093/nar/22.20.4224 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA PQ220 UT WOS:A1994PQ22000029 PM 7937149 ER PT J AU HUNG, SH YU, Q GRAY, DM RATLIFF, RL AF HUNG, SH YU, Q GRAY, DM RATLIFF, RL TI EVIDENCE FROM CD-SPECTRA THAT D(PURINE)CENTER-DOT-R(PYRIMIDINE) AND R(PURINE)CENTER-DOT-D(PYRIMIDINE) HYBRIDS ARE IN DIFFERENT STRUCTURAL CLASSES SO NUCLEIC ACIDS RESEARCH LA English DT Article ID DNA-RNA HYBRID; HIV-1 REVERSE-TRANSCRIPTASE; CIRCULAR-DICHROISM SPECTRA; OLIGONUCLEOTIDE INTERACTIONS; SECONDARY STRUCTURES; RIBONUCLEASE-H; SEQUENCE; POLY(RA).POLY(DT); DUPLEXES; CONFORMATION AB CD spectra and difference CD spectra of four d(oligopurine). r(oligopyrimidine) and four r(oligopurine). d(oligopyrimidine) hybrid duplexes containing mixed A.T(U) and G.C base pairs were compared with the spectra of four DNA.DNA and four RNA.RNA oligomer duplexes of similar repeating sequences. The 16 duplexes were formed by mixing oligomers that were 24 nucleotides long. The buffer was 0.05 M Na+ (phosphate), pH 7.0. DNA.DNA and RNA.RNA oligomer duplexes were used as reference B-form and A-form structures. We found that the CD spectra of d(purine).r(pyrimidine) and r(purine).d(pyrimidine) hybrid duplexes were different from the CD spectra of either DNA.DNA or RNA.RNA duplexes. The data suggested that these hybrids have intermediate structures between A-form RNA and B-form DNA structures. The CD spectra of d(purine).r(pyrimidine) and r(purine).d(pyrimidine) hybrid duplexes were different from each other, but the hybrids in each class had consistent CD spectra as indicated by nearest-neighbor comparisons. Thus, it appeared that the two types of hybrids belonged to different structural classes. The negative 210 nm band found in difference CD spectra was correlated with the presence of an r(purine) strand in the hybrid duplexes. The melting temperatures (T-m values) of these hybrids were compared with the T-m values of the DNA.DNA and RNA.RNA duplexes. The order of the thermal stability was: RNA.RNA duplex > r(purine).d(pyrimidine) hybrid > DNA.DNA duplex > d(purine).r(pyrimidine) hybrid, when comparing analogous sequences. C1 UNIV TEXAS,CELL & MOLEC BIOL PROGRAM,RICHARDSON,TX 75083. LOS ALAMOS NATL LAB,DIV LIFE SCI,GENET GRP,LOS ALAMOS,NM 87545. NR 35 TC 64 Z9 64 U1 2 U2 2 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD OCT 11 PY 1994 VL 22 IS 20 BP 4326 EP 4334 DI 10.1093/nar/22.20.4326 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA PQ220 UT WOS:A1994PQ22000043 PM 7937162 ER PT J AU CALLOW, MJ FERRIN, LJ RUBIN, EM AF CALLOW, MJ FERRIN, LJ RUBIN, EM TI SINGLE-BASE, SITE-DIRECTED MUTAGENESIS OF A 90-KILOBASE-PAIR P1-CLONE SO NUCLEIC ACIDS RESEARCH LA English DT Note ID PHENOTYPIC SELECTION; DNA C1 NIDDKD,GENET & BIOCHEM BRANCH,BETHESDA,MD 20892. RP CALLOW, MJ (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720, USA. FU NHLBI NIH HHS [HL-20985, HL-5P60, HL 18574] NR 5 TC 8 Z9 8 U1 0 U2 0 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD OCT 11 PY 1994 VL 22 IS 20 BP 4348 EP 4349 DI 10.1093/nar/22.20.4348 PG 2 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA PQ220 UT WOS:A1994PQ22000048 PM 7937166 ER PT J AU KWON, HY BULTMAN, SJ LOFFLER, C CHEN, WJ FURDON, PJ POWELL, JG USALA, AL WILKISON, W HANSMANN, I WOYCHIK, RP AF KWON, HY BULTMAN, SJ LOFFLER, C CHEN, WJ FURDON, PJ POWELL, JG USALA, AL WILKISON, W HANSMANN, I WOYCHIK, RP TI MOLECULAR-STRUCTURE AND CHROMOSOMAL MAPPING OF THE HUMAN HOMOLOG OF THE AGOUTI GENE SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE PHYSICAL MAPPING; MATURITY ONSET DIABETES OF THE YOUNG ID INSITU HYBRIDIZATION; MOUSE CHROMOSOME-2; SEQUENCE-ANALYSIS; MICE; IDENTIFICATION; PROTEIN; INSULIN; LOCUS; MODY; MAP AB The agouti (a) locus in mouse chromosome 2 normally regulates coal color pigmentation. The mouse agouti gene was recently cloned and shown to encode a distinctive 131-amino acid protein with a consensus signal peptide. Here we describe the cloning of the human homolog of the mouse agouti gene using an interspecies DNA-hybridization approach. Sequence analysis revealed that the coding region of the human agouti gene is 85% identical to the mouse gene and has the potential to encode a protein of 132 amino acids with a consensus signal peptide. Chromosomal assignment using somatic-cell-hybrid mapping panels and fluorescence in situ hybridization demonstrated that the human agouti gene maps to chromosome band 20q11.2. This result revealed that the human agouti gene is closely linked to several traits, including a locus called MODY (for maturity onset diabetes of the young) and another region that is associated with the development of myeloid leukemia. initial expression studies with RNA from several adult human tissues showed that the human agouti gene is expressed in adipose tissue and testis. C1 UNIV TENNESSEE,GRAD SCH BIOMED SCI,OAK RIDGE,TN 37831. UNIV GOTTINGEN,INST HUMAN GENET,W-3400 GOTTINGEN,GERMANY. GLAXO INC,RES INST,DEPT BIOCHEM,RES TRIANGLE PK,NC 27709. E CAROLINA UNIV,DEPT PEDIAT ENDOCRINOL,GREENVILLE,NC 27858. RP KWON, HY (reprint author), OAK RIDGE NATL LAB,DIV BIOL,POB 2009,OAK RIDGE,TN 37831, USA. FU NIEHS NIH HHS [IAG 222Y01-ES-10067] NR 31 TC 135 Z9 142 U1 0 U2 5 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD OCT 11 PY 1994 VL 91 IS 21 BP 9760 EP 9764 DI 10.1073/pnas.91.21.9760 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PM138 UT WOS:A1994PM13800020 PM 7937887 ER PT J AU SELVIN, PR HEARST, JE AF SELVIN, PR HEARST, JE TI LUMINESCENCE ENERGY-TRANSFER USING A TERBIUM CHELATE - IMPROVEMENTS ON FLUORESCENCE ENERGY-TRANSFER SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE LANTHANIDE ELEMENTS; EUROPIUM FORSTER THEORY; RESONANCE ID METAL-BINDING SITES; ION LUMINESCENCE; NUCLEIC-ACIDS; PROBES; THERMOLYSIN; MOLECULES; DNA AB We extend the technique of fluorescence resonance energy transfer (FRET) by introducing a luminescent terbium chelate as a donor and an organic dye, tetramethyl-rhodamine, as an acceptor. The results ace consistent with a Forster theory of energy transfer, provided the appropriate parameters are used. The use of lanthanide donors, in general, and this pair, in particular, has many advantages over more conventional FRET pairs, which rely solely on organic dyes. The distance at which 50% energy transfer occurs is large, 65 Angstrom; the donor lifetime is a single exponential and long (millisecond), making lifetime measurements facile and accurate. Uncertainty in the orientation factor, which creates uncertainty in measured distances, is minimized by the donor's multiple electronic transitions and long lifetime. The sensitized emission of the acceptor can be measured with little or no interfering background, yielding a >25-fold improvement in the signal-to-background ratio over standard donor-acceptor pairs. These improvements are expected to make distances >100 Angstrom measurable via FRET. We also report measurement of the sensitized emission lifetime, a measurement that is completely insensitive to total concentration and incomplete labeling. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. RP SELVIN, PR (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. FU NIGMS NIH HHS [R01 GM 41911] NR 27 TC 222 Z9 225 U1 5 U2 36 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD OCT 11 PY 1994 VL 91 IS 21 BP 10024 EP 10028 DI 10.1073/pnas.91.21.10024 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA PM138 UT WOS:A1994PM13800074 PM 7937831 ER PT J AU TIMERBAEV, AR SEMENOVA, OP BONN, GK FRITZ, JS AF TIMERBAEV, AR SEMENOVA, OP BONN, GK FRITZ, JS TI DETERMINATION OF METAL-IONS COMPLEXED WITH 2,6-DIACETYLPYRIDINE BIS(N-METHYLENEPYRIDINIOHYDRAZONE) BY CAPILLARY ELECTROPHORESIS SO ANALYTICA CHIMICA ACTA LA English DT Article DE CAPILLARY ZONE ELECTROPHORESIS; CHELATING REAGENTS; METAL ION ANALYSIS; MICELLAR ELECTROPHORETIC SYSTEMS ID DIRECT UV DETECTION; ZONE ELECTROPHORESIS; CHROMATOGRAPHIC DETERMINATION; SEPARATION AB Metal ions were determined quantitatively and selectively by complexation with 2,6-diacetylpyridine bis(N-methylenepyridiniohydrazone) (H(2)dapmp) and separation of the metal ion complexes formed using capillary zone electrophoresis. The effect of various alkyltrimethylammonium ions added to the running electrolyte on the migration behaviour of cationic chelate complexes was examined. As a result, some evidence was obtained that both electrophoretic migration and micellar partitioning play the major role in the separation mechanism. Optimum resolution of metal-H(2)dapmp complexes was achieved with a 10 mM sodium berate buffer (pH 9.0) containing 75 mM tetradecyltrimethylammonium bromide and 10 mM sodium n-octanesulfonate as an ion-pairing counterion. With this micellar buffer system, it was possible to separate and determine up to fourteen metal ions in a single run within 12 min using fused-silica capillaries at 15 kV and direct on-column UV detection at 254 nm. Linear calibration ranges of more than two orders of magnitude and detection limits at mid-ppb levels are presented for the metal complexes of Cd(II), Co(II), Cu(II), Fe(III), Hg(II), Mo(VI), Sc(III), U(VI), V(V), Y(III) and Zn(II). C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP TIMERBAEV, AR (reprint author), JOHANNES KEPLER UNIV,DEPT ANALYT CHEM,ALTENBERGERSTR 69,A-4040 LINZ,AUSTRIA. RI Timerbaev, Andrei/G-7530-2016 NR 20 TC 36 Z9 36 U1 0 U2 2 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 OCT 10 PY 1994 VL 296 IS 2 BP 119 EP 128 DI 10.1016/0003-2670(94)80256-4 PG 10 WC Chemistry, Analytical SC Chemistry GA PL214 UT WOS:A1994PL21400002 ER PT J AU WU, XD FOLTYN, SR ARENDT, P TOWNSEND, J ADAMS, C CAMPBELL, IH TIWARI, P COULTER, Y PETERSON, DE AF WU, XD FOLTYN, SR ARENDT, P TOWNSEND, J ADAMS, C CAMPBELL, IH TIWARI, P COULTER, Y PETERSON, DE TI HIGH-CURRENT YBA2CU3O7-DELTA THICK-FILMS ON FLEXIBLE NICKEL SUBSTRATES WITH TEXTURED BUFFER LAYERS SO APPLIED PHYSICS LETTERS LA English DT Article ID TRANSPORT-PROPERTIES; LASER DEPOSITION; TEMPERATURE; ORIENTATION; DEPENDENCE; BICRYSTALS AB High current YBa2Cu3O7-delta (YBCO) thick films on flexible nickel substrates with textured buffer layers were fabricated. Highly textured yttria-stabilized-zirconia buffer layers were deposited by using ion beam assisted deposition (IBAD). Pulsed laser deposited YBCO films were not only c-axis oriented with respect to the film surface but also strongly in-plane textured. The in-plane mosaic spread of YBCO films was approximately 10-degrees. A critical current density of 8 x 10(5) A/cm2 was obtained at 75 K and zero field for thin YBCO films. It was also demonstrated that thick YBCO films with a high critical current and excellent magnetic field dependence at liquid nitrogen temperature can be obtained on flexible nickel substrates by using the textured buffer layers. The result indicates that thick film technology in combination with IBAD buffer layers could be a viable method for fabricating YBCO tapes in long lengths. (C) 1994 American Institute of Physics. RP WU, XD (reprint author), LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,CTR SUPERCONDUCT TECHNOL,LOS ALAMOS,NM 87545, USA. NR 16 TC 182 Z9 195 U1 1 U2 10 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 10 PY 1994 VL 65 IS 15 BP 1961 EP 1963 DI 10.1063/1.112830 PG 3 WC Physics, Applied SC Physics GA PM784 UT WOS:A1994PM78400035 ER PT J AU ZUREK, WH SIEMIGINOWSKA, A COLGATE, SA AF ZUREK, WH SIEMIGINOWSKA, A COLGATE, SA TI STAR-DISK COLLISIONS AND THE ORIGIN OF THE BROAD LINES IN QUASARS SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, ACTIVE; LINE, FORMATION; QUASARS, GENERAL; RADIATION MECHANISMS, NONTHERMAL ID MASSIVE BLACK-HOLE; SEYFERT-GALAXIES; GALACTIC NUCLEI; ACCRETION DISK; EMISSION AB Quasars and other active galactic nuclei (AGNs) are most likely powered by a massive black hole surrounded by an accretion disk and inhabiting the core of a dense stellar cluster. Star orbits intersect the disk. Hence, star-disk collisions are a daily (if not more frequent) occurrence. We consider the consequences of such collisions and show that the ''star tails'' of the disk material, accelerated by the encounter with the passing star, can travel well above the disk and, therefore, are a natural candidate for the observed broad emission-line regions. C1 CTR ASTROPHYS,CAMBRIDGE,MA 02138. RP ZUREK, WH (reprint author), LOS ALAMOS NATL LAB,T-6,MS B288,LOS ALAMOS,NM 87545, USA. NR 35 TC 31 Z9 31 U1 1 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 10 PY 1994 VL 434 IS 1 BP 46 EP 53 DI 10.1086/174703 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PK764 UT WOS:A1994PK76400005 ER PT J AU GREEN, PJ MARGON, B ANDERSON, SF COOK, KH AF GREEN, PJ MARGON, B ANDERSON, SF COOK, KH TI A CCD SURVEY FOR FAINT HIGH-LATITUDE CARBON STARS SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, CARBON; STARS, EVOLUTION; STARS, STATISTICS; SURVEYS ID NORTH GALACTIC POLE; INFRARED PHOTOMETRY; STELLAR CONTENT; HALO; KINEMATICS; GALAXIES; QUASARS; GIANTS; SYSTEM; COUNTS AB We describe a wide-area CCD survey to search for faint high-latitude carbon (FHLC) stars. Carbon giants provide excellent probes of the structure and kinematics of the outer Galactic halo. We use two-color photometric selection with large-format CCDs to cover 52 deg(2) of sky to a depth of about V = 18. Of 94 faint C star candidates from our own CCD survey, one highly ranked V = 17 candidate was found to have strong carbon and CN bands. We estimate that, to a depth of V = 18, the surface density of FHLC stars is 0.02 deg(-2) An updated FHLC sample is used to constrain halo kinematic and structural parameters. Although larger samples are needed, the effective radius of FHLC giants, assuming a de Vaucouleurs law distribution, is larger than that for Galactic globular clusters. C1 UNIV WASHINGTON,DEPT ASTRON,SEATTLE,WA 98195. LAWRENCE LIVERMORE NATL LAB,EXPTL ASTROPHYS LAB,LIVERMORE,CA 94550. RP GREEN, PJ (reprint author), HARVARD SMITHSONIAN CTR ASTROPHYS,60 GARDEN ST,CAMBRIDGE,MA 02138, USA. RI Margon, Bruce/B-5913-2012 NR 42 TC 25 Z9 25 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 10 PY 1994 VL 434 IS 1 BP 319 EP 329 DI 10.1086/174730 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PK764 UT WOS:A1994PK76400032 ER PT J AU AMOSOV, KY ANDREYASHKIN, MY VERZILOV, VA VNUKOV, IE ZABAEV, VN KALININ, BN KAPLIN, VV KUSTOV, DV NAUMENKO, GA PIVOVAROV, YL POTYLITSYN, AP ROZUM, EI UGLOV, SR MORAN, M AF AMOSOV, KY ANDREYASHKIN, MY VERZILOV, VA VNUKOV, IE ZABAEV, VN KALININ, BN KAPLIN, VV KUSTOV, DV NAUMENKO, GA PIVOVAROV, YL POTYLITSYN, AP ROZUM, EI UGLOV, SR MORAN, M TI PARAMETIC X-RADIATION IN A MOSAIC CRYSTAL OF PYROLYTIC SO JETP LETTERS LA English DT Article C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP AMOSOV, KY (reprint author), TOMSK POLYTECH UNIV,SCI RES INST NUCL PHYS,BOX 25,634050 TOMSK,RUSSIA. NR 11 TC 8 Z9 8 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-3640 J9 JETP LETT+ JI Jetp Lett. PD OCT 10 PY 1994 VL 60 IS 7 BP 518 EP 523 PG 6 WC Physics, Multidisciplinary SC Physics GA PW009 UT WOS:A1994PW00900006 ER PT J AU OCKO, BM MAGNUSSEN, OM ADZIC, RR WANG, JX SHI, Z LIPKOWSKI, J AF OCKO, BM MAGNUSSEN, OM ADZIC, RR WANG, JX SHI, Z LIPKOWSKI, J TI A CRITICAL COMPARISON OF ELECTROCHEMICAL AND SURFACE X-RAY-SCATTERING RESULTS AT THE AU(111) ELECTRODE IN KBR SOLUTIONS SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID SCANNING-TUNNELING-MICROSCOPY; AU(001) RECONSTRUCTION; ACIDIC ELECTROLYTES; INSITU; AU(100); REFLECTIVITY; DIFFRACTION; ADSORPTION AB Electrochemical and surface X-ray scattering data are compared for the Au(111) electrode in 0.01 M KBr solution in 0.1 M KClO4 The irreversible peaks in the voltammogram are well correlated with the scattered X-ray intensity from the reconstructed surface in both sweep directions. Surface charge and bromide coverage measured by the chronocoulometric technique are also correlated with the X-ray intensity. The reconstruction lifts over a potential region where the surface charge changes from - 10 to 20 mu C cm(-2) and the bromide coverage increases from 10% to 25% of its saturated coverage. C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV CHEM SCI,UPTON,NY 11973. UNIV GUELPH,COLL PHYS & ENGN SCI,GUELPH N1G 2W1,ON,CANADA. RP OCKO, BM (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Wang, Jia/B-6346-2011 NR 30 TC 43 Z9 43 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD OCT 10 PY 1994 VL 376 IS 1-2 BP 35 EP 39 DI 10.1016/0022-0728(94)03462-1 PG 5 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA PK773 UT WOS:A1994PK77300005 ER PT J AU POLEWSKA, W WANG, JX OCKO, BM ADZIC, RR AF POLEWSKA, W WANG, JX OCKO, BM ADZIC, RR TI SCANNING-TUNNELING-MICROSCOPY OF ELECTRODEPOSITED THALLIUM MONOLAYERS ON AU(111) IN ALKALINE-SOLUTION SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID X-RAY-SCATTERING; UNDERPOTENTIAL DEPOSITION; PB; DIFFRACTION; SURFACES; GOLD; BI AB The structure of electrodeposited Tl adlayers on Au(111) in 0.1 M NaOH has been investigated using in situ scanning tunneling microscopy (STM). Incommensurate rotated hexagonal Tl adlayers exist over a wide potential region between the bulk deposition and -0.38 V. The Tl monolayer is closely packed with a Tl-Tl spacing of 3.4 +/- 0.2 A and is rotated from the substrate axis by 6 degrees +/- 1 degrees. Its coverage is 0.74. Between -0.36 and -0.18 V, an incommensurate aligned hexagonal phase is observed in which the Tl-Tl spacing is 3.8 +/- 0.2 Angstrom and the coverage is 0.56. The first-order transformation between these two phases at - 0.37 V involves the coadsorption of OH- which facilitates the existence of this unusual low coverage incommensurate Tl phase. At more positive potentials, a new hexagonal adlayer is observed without atomic resolution. The adlayer at E > - 0.04 V is disordered and appears to be formed during the oxidation of the Tl adsorbate with additional Tl adsorption from solution. There is an excellent agreement between the STM results and surface X-ray scattering results obtained earlier. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV CHEM SCI,UPTON,NY 11973. RI Wang, Jia/B-6346-2011 NR 15 TC 22 Z9 22 U1 1 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD OCT 10 PY 1994 VL 376 IS 1-2 BP 41 EP 47 DI 10.1016/0022-0728(94)03426-5 PG 7 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA PK773 UT WOS:A1994PK77300006 ER PT J AU TIDSWELL, IM MARKOVIC, NM ROSS, PN AF TIDSWELL, IM MARKOVIC, NM ROSS, PN TI POTENTIAL-DEPENDENT SURFACE-STRUCTURE OF THE PT(111)VERTICAL-BAR-ELECTROLYTE INTERFACE SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID PLATINUM STEPPED SURFACES; X-RAY-SCATTERING; SINGLE-CRYSTAL ELECTRODES; SULFURIC-ACID ANIONS; BISULFATE ADSORPTION; 110 ZONE; HYDROGEN; ELECTROSORPTION; VOLTAMMETRY; BEHAVIOR AB X-Ray scattering has been used to study the structure of the Pt(1 1 1) interface with 0.1 M KOH and 0.05 M H2SO4 electrolytes. The absence of in-plane reconstruction peaks and the intensity profiles of the crystal truncation rods (CTR) indicate that the surface is not reconstructed at any potential. At potentials just above hydrogen evolution a monotonic expansion of the top Pt layer occurs in the region where hydrogen is adsorbed on the surface. The maximum expansion was approximately 0.03 Angstrom in KOH electrolyte and approximately half this magnitude in H2SO4 electrolyte. For both electrolytes this expansion is smaller than observed for the Pt(0 0 1) surface. The ''anomalous voltammetric feature'' observed in both electrolytes appears to be due to anion adsorption and/or an ordering transition in the inner ionic layer. At potentials approximately 1 V positive of hydrogen evolution, displacement of a fraction of the top Pt layer from bulk lattice positions occurs during anodic oxidation. This restructuring is reversible upon lowering the potential and reducing the oxide. RP TIDSWELL, IM (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 22 TC 54 Z9 54 U1 2 U2 6 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD OCT 10 PY 1994 VL 376 IS 1-2 BP 119 EP 126 DI 10.1016/0022-0728(94)03553-9 PG 8 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA PK773 UT WOS:A1994PK77300015 ER PT J AU WILLIAMS, CA CONNERS, C DAHLEN, FA PRICE, EJ SUPPE, J AF WILLIAMS, CA CONNERS, C DAHLEN, FA PRICE, EJ SUPPE, J TI EFFECT OF THE BRITTLE-DUCTILE TRANSITION ON THE TOPOGRAPHY OF COMPRESSIVE MOUNTAIN BELTS ON EARTH AND VENUS SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID THRUST BELTS; ACCRETIONARY WEDGES; FREYJA-MONTES; GRAIN-SIZE; LITHOSPHERE; RHEOLOGY; MECHANICS; MODEL; DEFORMATION; TECTONICS AB The Coulomb critical taper model has been very successful in explaining the large-scale topography of a number of terrestrial accretionary wedges; however, this model is limited to cases of purely brittle-frictional deformation. In this paper we extend the range of applicability of the critical taper model by explicitly including the effects of temperature-dependent ductile deformation. The new model includes temperature-dependent power law flow, an assumed velocity field, and linear thermal gradients in the atmosphere and within the crust. Flexural isostasy is also incorporated so that the decollement geometry is computed as a response to the applied load of the wedge material. We assume that ductile deformation within the decollement zone is controlled primarily by diffusion flow, whereas ductile deformation within the wedge itself is controlled by dislocation creep. The topographic profiles predicted by the model are very similar to those of a number of fold-and-thrust belts on both Earth and Venus. A typical wedge profile includes three distinctive topographic regions: a narrow taper toe, where both the wedge and the decollement zone deform in a brittle-frictional manner; a region of relatively steep slope, where the wedge base deforms ductilely and the decollement zone is still frictional; and a flat plateau region, where both the wedge base and the decollement zone are deforming by ductile flow. We have applied the model to two fold-and-thrust belts on Venus (Maxwell Montes and Uorsar Rupes) and to the Andes on Earth, and we find good agreement between observed and predicted topography using reasonable parameter values. The model accounts for the observed positive correlation between relief and elevation of Venusian fold-and-thrust belts on the basis of different thermal environments at different elevations. It is also able to explain the first-order differences between terrestrial and Venusian fold-and-thrust belts; fundamentally, this difference is due to a combination of the lower temperatures and the presence of water on Earth. C1 PRINCETON UNIV, DEPT GEOL & GEOPHYS SCI, PRINCETON, NJ 08544 USA. UNIV CALIF SAN DIEGO, SCRIPPS INST OCEANOG, INST GEOPHYS & PLANETARY PHYS, LA JOLLA, CA 92093 USA. RP WILLIAMS, CA (reprint author), LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA USA. RI Williams, Charles/D-9377-2011 NR 55 TC 34 Z9 34 U1 0 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9313 EI 2169-9356 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD OCT 10 PY 1994 VL 99 IS B10 BP 19947 EP 19974 DI 10.1029/94JB01407 PG 28 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA PL027 UT WOS:A1994PL02700024 ER PT J AU ROESSLI, B FISCHER, P SCHEFER, J BUHRER, W FURRER, A VOGT, T PETRAVOVSKII, G SABLINA, K AF ROESSLI, B FISCHER, P SCHEFER, J BUHRER, W FURRER, A VOGT, T PETRAVOVSKII, G SABLINA, K TI ELASTIC AND INELASTIC NEUTRON STUDY OF CUGEO3 SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID SPIN-PEIERLS TRANSITION; CHAINS AB Elastic and inelastic neutron scattering was used to probe the structural and magnetic properties of polycrystalline CuGeO3. The diffraction data show that the chemical lattice remains stable in the measured temperature range 1.5 K less-than-or-equal-to T less-than-or-equal-to 296 K. At low temperature the inelastic experiments revealed a well defined magnetic excitation at 15 meV, which persists up to T = 50 K. The analysis of the spin-wave spectrum is based on a one-dimensional Heisenberg model within the spin-wave theory. On the other hand, no evidence of energy-gap opening, which would result from a dimerization of the Cu chains, could be found at low temperature. C1 PAUL SCHERRER INST,CH-5232 VILLIGEN,SWITZERLAND. ACAD SCI,KRASNOYARSK 660036,RUSSIA. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. ETH ZURICH,NEUTRON SCATTERING LAB,CH-5232 VILLIGEN,SWITZERLAND. RI Schefer, Jurg/G-3960-2012; Vogt, Thomas /A-1562-2011 OI Vogt, Thomas /0000-0002-4731-2787 NR 18 TC 12 Z9 12 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 OCT 10 PY 1994 VL 6 IS 41 BP 8469 EP 8477 DI 10.1088/0953-8984/6/41/009 PG 9 WC Physics, Condensed Matter SC Physics GA PM099 UT WOS:A1994PM09900009 ER PT J AU LANGMANN, E SALMHOFER, M KOVNER, A AF LANGMANN, E SALMHOFER, M KOVNER, A TI CONSISTENT AXIAL-LIKE GAUGE-FIXING ON HYPERTORI SO MODERN PHYSICS LETTERS A LA English DT Article ID CONFIGURATION SPACE; GRIBOV AMBIGUITY; CRITICAL LIMIT; CYLINDER; VACUUM AB We analyze the Gribov problem for SU(N) and U(N) Yang-Mills fields on d-dimensional tori, d = 2,3,.... We give an improved version of the axial gauge condition and find an infinite, discrete group G' = Z(dr) ?? (Z(2)(N-1) ?? Z(2)) where r = N-1 and N for ($) under bar G = SU(N) and U(N) respectively, containing all gauge transformations compatible with that condition. This residual gauge group G' provides all Gribov copies for nondegenerate configurations in d = 2 and for those of them for which all winding numbers of the Wilson-Polyakov loop in one direction vanish in d greater than or equal to 3. This shows that the space of gauge orbits is an orbifold. We derive this result both in the Lagrangian and in the Hamiltonian framework. C1 UNIV BRITISH COLUMBIA, DEPT PHYS, VANCOUVER V6T 1Z1, BC, CANADA. PRINCETON UNIV, DEPT PHYS, PRINCETON, NJ 08544 USA. LOS ALAMOS NATL LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. OI Langmann, Edwin/0000-0001-7481-2245 NR 21 TC 19 Z9 19 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0217-7323 EI 1793-6632 J9 MOD PHYS LETT A JI Mod. Phys. Lett. A PD OCT 10 PY 1994 VL 9 IS 31 BP 2913 EP 2926 DI 10.1142/S0217732394002756 PG 14 WC Physics, Nuclear; Physics, Particles & Fields; Physics, Mathematical SC Physics GA PR740 UT WOS:A1994PR74000007 ER PT J AU WEBER, M DONZAUD, C DUFOUR, JP GEISSEL, H GREWE, A GUILLEMAUDMUELLER, D KELLER, H LEWITOWICZ, M MAGEL, A MUELLER, AC MUNZENBERG, G NICKEL, F PFUTZNER, M PIECHACZEK, A PRAVIKOFF, M ROECKL, E RYKACZEWSKI, K SAINTLAURENT, MG SCHALL, I STEPHAN, C SUMMERER, K TASSANGOT, L VIEIRA, DJ VOSS, B AF WEBER, M DONZAUD, C DUFOUR, JP GEISSEL, H GREWE, A GUILLEMAUDMUELLER, D KELLER, H LEWITOWICZ, M MAGEL, A MUELLER, AC MUNZENBERG, G NICKEL, F PFUTZNER, M PIECHACZEK, A PRAVIKOFF, M ROECKL, E RYKACZEWSKI, K SAINTLAURENT, MG SCHALL, I STEPHAN, C SUMMERER, K TASSANGOT, L VIEIRA, DJ VOSS, B TI LONGITUDINAL MOMENTA AND PRODUCTION CROSS-SECTIONS OF ISOTOPES FORMED BY FRAGMENTATION OF A 500-AXMEV KR-86 BEAM SO NUCLEAR PHYSICS A LA English DT Article DE BE-9; CU; TA(KR-86),X); E = 500 MEV NUCLEON; MEASURED FRAGMENT LONGITUDINAL MOMENTUM DISTRIBUTION; PRODUCTION-SIGMA FOR MASS 10-90; DEDUCED NI-78 PRODUCTION-SIGMA; SEMIEMPIRICAL; GEOMETRICAL ABRASION; INTRANUCLEAR-CASCADE MODELS ID PERIPHERAL NUCLEAR COLLISIONS; AU-197 PROJECTILES; IONS; DISTRIBUTIONS; SYSTEMATICS AB At the projectile-fragment separator FRS at GSI, longitudinal momentum distributions an production cross-sections were investigated for reactions between a 500 A x MeV Kr-86 beam and beryllium, copper and tantalum targets. Fragments in a wide A/Z range were studied. For fragments close to the projectile the measured longitudinal momentum distributions agree qualitatively with a semi-empirical parametrization. Deviations from this simple picture are found, however, for the momentum widths of light fragments and for the momentum transfer to those fragments that differ in their N/Z ratio from the most probable value. The experimental data on production cross-sections are used for testing the predictions obtained from a semi-empirical parametrization, a geometrical abrasion model and an intranuclear-cascade model. The cross-section for the formation of the doubly magic nucleus Ni-78 in Kr-86 fragmentation is estimated to be 17 pb. C1 INST PHYS NUCL LYON,IN2P3,CNRS,F-91406 ORSAY,FRANCE. CEN BORDEAUX GRADIGNAN,F-33175 GRADIGNAN,FRANCE. TH DARMSTADT,INST KERNPHYS,D-64289 DARMSTADT,GERMANY. GANIL,F-14021 CAEN,FRANCE. UNIV GIESSEN,INST PHYS 2,D-35392 GIESSEN,GERMANY. LANL,LOS ALAMOS,NM 87545. RP WEBER, M (reprint author), GESELL SCHWERIONENFORSCH MBH,D-64220 DARMSTADT,GERMANY. NR 21 TC 36 Z9 36 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD OCT 10 PY 1994 VL 578 IS 3-4 BP 659 EP 672 DI 10.1016/0375-9474(94)90766-8 PG 14 WC Physics, Nuclear SC Physics GA PK761 UT WOS:A1994PK76100016 ER PT J AU GREGORY, R LAFLAMME, R AF GREGORY, R LAFLAMME, R TI THE INSTABILITY OF CHARGED BLACK STRINGS AND P-BRANES SO NUCLEAR PHYSICS B LA English DT Article ID MASSIVE DILATON; HOLES AB We investigate the evolution of small perturbations around charged black strings and branes which are solutions of low energy string theory. We give the details of the analysis for the uncharged case which was summarized in a previous paper. We extend the analysis to the small charge case and give also an analysis for the generic case, following the behavior of unstable modes as the charge is modified. We study specifically a magnetically charged black 6-brane, but show how the instability is generic, and that charge does not in general stabilize black strings and p-branes. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP GREGORY, R (reprint author), UNIV CAMBRIDGE,DEPT APPL MATH & THEORET PHYS,SILVER ST,CAMBRIDGE CB3 9EW,ENGLAND. NR 24 TC 267 Z9 267 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD OCT 10 PY 1994 VL 428 IS 1-2 BP 399 EP 434 DI 10.1016/0550-3213(94)90206-2 PG 36 WC Physics, Particles & Fields SC Physics GA PQ925 UT WOS:A1994PQ92500019 ER PT J AU GIELE, WT GLOVER, EWN KOSOWER, DA AF GIELE, WT GLOVER, EWN KOSOWER, DA TI 2-JET DIFFERENTIAL CROSS-SECTION AT O(ALPHA(S)(3)) IN HADRON-COLLISIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGHER-ORDER CORRECTIONS; ALPHA-S(3); GLUONS; QCD; TEV AB We study the two-jet inclusive cross section via the triply differential distribution d(3) sigma/dE(tau) d eta(1) d eta(2) to next-to-leading order in QCD. The predicted distributions can be compared directly with forthcoming data from the DO and CDF experiments at Fermilab. We discuss differences with the leading-order predictions and examine uncertainties due to the choice of scale and parton density. C1 UNIV DURHAM,DEPT PHYS,DURHAM DH1 3LE,ENGLAND. CTR ETUD SACLAY,SERV PHYS THEOR,F-91191 GIF SUR YVETTE,FRANCE. RP GIELE, WT (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. RI Glover, Edward/A-4597-2012 OI Glover, Edward/0000-0002-0173-4175 NR 19 TC 100 Z9 100 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 10 PY 1994 VL 73 IS 15 BP 2019 EP 2022 DI 10.1103/PhysRevLett.73.2019 PG 4 WC Physics, Multidisciplinary SC Physics GA PM774 UT WOS:A1994PM77400003 ER PT J AU DENG, L ZHANG, JY PAYNE, MG GARRETT, WR AF DENG, L ZHANG, JY PAYNE, MG GARRETT, WR TI EFFECT OF PRESSURE-DEPENDENT QUANTUM INTERFERENCE ON THE AC STARK SHIFTING OF A 4-PHOTON RESONANCE SO PHYSICAL REVIEW LETTERS LA English DT Article ID MULTIPHOTON IONIZATION; HARMONIC-GENERATION; 3-PHOTON RESONANCE; 4-PHOTON RESONANCE; EXCITATION AB We report an experiment in xenon which confirms theoretical predictions [Payne et al., Phys. Rev. A 48, 2334 (1993)] on the pressure dependent suppression of the ac Stark shifting of even-photon resonances. In the copropagating configuration the ac Stark shift introduced by a second laser is totally suppressed at elevated concentrations due to a very complete destructive interference between two pumping pathways. The ac Stark shift persists in the counterpropagating configuration. C1 OAK RIDGE NATL LAB,CHEM PHYS SECT,OAK RIDGE,TN 37831. RP DENG, L (reprint author), GEORGIA SO UNIV,DEPT PHYS,STATESBORO,GA 30460, USA. RI Deng, Lu/B-3997-2012 NR 16 TC 21 Z9 21 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 10 PY 1994 VL 73 IS 15 BP 2035 EP 2038 DI 10.1103/PhysRevLett.73.2035 PG 4 WC Physics, Multidisciplinary SC Physics GA PM774 UT WOS:A1994PM77400007 ER PT J AU YOUNG, PE WILLIAMS, EA ESTABROOK, KG AF YOUNG, PE WILLIAMS, EA ESTABROOK, KG TI OBSERVATIONS OF TRANSITION TO STRONGLY COUPLED STIMULATED BRILLOUIN-SCATTERING IN LASER-PLASMA INTERACTIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID PARAMETRIC-INSTABILITIES; ELECTROMAGNETIC-WAVES; INHOMOGENEOUS PLASMAS AB Scattered light near the laser wavelength has been spectrally and temporally resolved in experiments in which a 1.06 mu m wavelength laser irradiates a low-Z target. At sufficiently high laser intensities, the backscattered spectrum broadens toward longer wavelengths (lower frequencies) by an amount which is several times an ion acoustic shift. The behavior of the spectra agrees well with the prediction of time-dependent, homogeneous theory. RP YOUNG, PE (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5508,LIVERMORE,CA 94550, USA. NR 20 TC 10 Z9 10 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 10 PY 1994 VL 73 IS 15 BP 2051 EP 2054 DI 10.1103/PhysRevLett.73.2051 PG 4 WC Physics, Multidisciplinary SC Physics GA PM774 UT WOS:A1994PM77400011 ER PT J AU MONTGOMERY, DS LANDEN, OL DRAKE, RP ESTABROOK, KG BALDIS, HA BATHA, SH BRADLEY, KS PROCASSINI, RJ AF MONTGOMERY, DS LANDEN, OL DRAKE, RP ESTABROOK, KG BALDIS, HA BATHA, SH BRADLEY, KS PROCASSINI, RJ TI MEASUREMENTS OF RADIAL HEAT-WAVE PROPAGATION IN LASER-PRODUCED EXPLODING-FOIL PLASMAS SO PHYSICAL REVIEW LETTERS LA English DT Article ID STEEP TEMPERATURE-GRADIENTS; ION-ACOUSTIC TURBULENCE; 0.35 MU-M; THERMAL CONDUCTION; TARGET EXPERIMENTS; TRANSPORT; FUSION; DISTRIBUTIONS; IRRADIATION; WAVELENGTHS AB Time-resolved, 2D images of x-ray emission from thin, laser-irradiated titanium foils are presented. The foils are irradiated with 0.35 mu m light at intensities of 1 x 10(15) W/cm(2) which produces a plasma with electron densities less than or equal to 10(22) cm(-3) and electron temperature of 3-4 keV. X-ray emission that is characteristic of the thermal heat front is observed to propagate radially outward from the heated region. Comparison of these measurements with 2D hydrodynamic simulations of the experiment suggests the radial heat flux to be about 3% of the free-streaming heat flux. C1 UNIV CALIF DAVIS,PLASMA PHYS RES INST,LIVERMORE,CA 94551. UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA 95616. RP MONTGOMERY, DS (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. RI Drake, R Paul/I-9218-2012; OI Drake, R Paul/0000-0002-5450-9844; Montgomery, David/0000-0002-2355-6242 NR 31 TC 29 Z9 32 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 OCT 10 PY 1994 VL 73 IS 15 BP 2055 EP 2058 DI 10.1103/PhysRevLett.73.2055 PG 4 WC Physics, Multidisciplinary SC Physics GA PM774 UT WOS:A1994PM77400012 ER PT J AU VU, DT MITCHELL, KAR WARREN, OL THIEL, PA AF VU, DT MITCHELL, KAR WARREN, OL THIEL, PA TI TENSER LEED ANALYSIS OF THE PD(100)-(ROOT-5X-ROOT-5)R27-DEGREES-O SURFACE-STRUCTURE SO SURFACE SCIENCE LA English DT Article ID ENERGY-ELECTRON-DIFFRACTION; PD(100) SURFACE; OXYGEN; RECONSTRUCTION; PHASE; DESORPTION; ADSORPTION; HYDROGEN AB A tenser LEED analysis of the Pd(100)-(root 5 x root 5)R27 degrees-O surface structure supports a surface oxide model, as first postulated by Orent and Bader. The detailed model which gives the best correspondence with experimental intensity data has a PdO(001) overlayer stacked on to the Pd(100) surface such that rumpling is induced in both the oxide and topmost Pd(100) layers. The structure can be seen as representing a compromise between the drive toward an ideally flat PdO(001) surface and the need to optimize total bonding at the surface. Pd atoms in the topmost Pd(100) layer appear to displace laterally to minimize corrugations in the top metal layers. The total corrugations in the PdO overlayer and the first Pd(100) layer are indicated to be about 0.26 and 0.51 Angstrom, respectively. The average O-Pd bond length for two-coordinate O on the Pd surface (1.73 Angstrom) remains dose to the predicted value of 1.76 Angstrom based on the structure of bulk PdO. C1 UNIV BRITISH COLUMBIA, DEPT CHEM, VANCOUVER V6T 1Z1, BC, CANADA. IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. NR 29 TC 40 Z9 40 U1 0 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 EI 1879-2758 J9 SURF SCI JI Surf. Sci. PD OCT 10 PY 1994 VL 318 IS 1-2 BP 129 EP 138 DI 10.1016/0039-6028(94)90348-4 PG 10 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA PL286 UT WOS:A1994PL28600019 ER EF