FN Thomson Reuters Web of Science™ VR 1.0 PT J AU MOVER, DB AF MOVER, DB TI ENVIRONMENTAL TOBACCO-SMOKE AS A RISK FACTOR FOR ASTHMA IN INNER-CITY CHILDREN SO JOURNAL OF PEDIATRICS LA English DT Letter RP MOVER, DB (reprint author), USN, NAVAL HOSP, DIV ALLERGY, MED CORPS, OAKLAND, CA 94627 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU MOSBY-ELSEVIER PI NEW YORK PA 360 PARK AVENUE SOUTH, NEW YORK, NY 10010-1710 USA SN 0022-3476 EI 1097-6833 J9 J PEDIATR-US JI J. Pediatr. PD JUL PY 1993 VL 123 IS 1 BP 171 EP 171 PG 1 WC Pediatrics SC Pediatrics GA LL223 UT WOS:A1993LL22300042 ER PT J AU ACKLESON, SG CULLEN, JJ BROWN, J LESSER, M AF ACKLESON, SG CULLEN, JJ BROWN, J LESSER, M TI IRRADIANCE-INDUCED VARIABILITY IN LIGHT SCATTER FROM MARINE-PHYTOPLANKTON IN CULTURE SO JOURNAL OF PLANKTON RESEARCH LA English DT Article ID SUSPENDED PARTICULATE MATTER; DISSOLVED ORGANIC-MATTER; SARGASSO-SEA; SPECTRAL ABSORPTION; OPTICAL-PROPERTIES; OCEAN; WATERS; PARTICLES; GROWTH; MODEL AB A series of laboratory experiments are reported that illustrate the response of beam attenuation (lambda = 660 nm) and single-cell light scatter (lambda = 488 nm) properties of several species of marine phytoplankton to light intensity. When unialgal cultures were subjected to an increase in light intensity, the particle-scattering component of beam attenuation and near-forward single-cell light scatter were found to increase rapidly in response. Cell abundance increased only slightly over the course of the experiments, leading to the conclusion that the response in beam attenuation was due to irradiance-induced changes in the single-cell optical properties. The percent hourly increase in beam attenuation, normalized to cell abundance, and single-cell light scatter ranged from 5% for a culture of the coccolithophore Emiliania huxleyi to 25% for a culture of Thalassiosira pseudonana. In a separate set of experiments, carbon-specific beam attenuation (c*c; the particulate material component of beam attenuation normalized to the concentration of particulate organic carbon) was found to be species specific and, to some extent, sensitive to irradiance. The positive response in phytoplankton light scatter, both at the population and at the single-cell level, to an increase in light intensity is similar to diel patterns in beam attenuation reported for the near-surface ocean. If a component of the observed diel pattern in beam attenuation is due to irradiance-induced, carbon-independent optical variability in the phytoplankton assemblage, as the results of the high-light experiments suggest, neglecting such variability can result in either an overestimation or an underestimation of primary production, depending on the response in c*c. Natural variability in c*c is poorly understood and responses to environmental factors, such as irradiance, have yet to be addressed outside of the laboratory. C1 DALHOUSIE UNIV,DEPT OCEANOG,HALIFAX B3H 4J1,NS,CANADA. BIGELOW LAB OCEAN SCI,W BOOTHBAY HARBOR,ME 04575. RP ACKLESON, SG (reprint author), OFF NAVAL RES,CODE 11230P,800 N QUINCY ST,ARLINGTON,VA 22217, USA. RI Cullen, John/B-6105-2008 OI Cullen, John/0000-0002-7740-0999 NR 49 TC 17 Z9 17 U1 0 U2 3 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0142-7873 J9 J PLANKTON RES JI J. Plankton Res. PD JUL PY 1993 VL 15 IS 7 BP 737 EP 759 DI 10.1093/plankt/15.7.737 PG 23 WC Marine & Freshwater Biology; Oceanography SC Marine & Freshwater Biology; Oceanography GA LM941 UT WOS:A1993LM94100002 ER PT J AU PARR, TP GUTMARK, E HANSONPARR, DM SCHADOW, KC AF PARR, TP GUTMARK, E HANSONPARR, DM SCHADOW, KC TI FEEDBACK-CONTROL OF AN UNSTABLE DUCTED FLAME SO JOURNAL OF PROPULSION AND POWER LA English DT Article ID ACTIVE CONTROL; COMBUSTION; OSCILLATIONS AB Active control of a naturally unstable ducted flame was realized using acoustic forcing of either the shear layer of the flame jet or the duct itself. The feedback signal was derived from either the duct pressure signal or the CH intensity (related to the flame heat release rate), and delayed in time to produce cancellation of the natural resonant oscillations of the system. Direct driving of the shear layer using the duct pressure signal feedback produced the best control with the lowest power requirements. The controller was able to reduce the acoustic power in the duct at the resonant frequency from 19 Pa to about 0.7 Pa, or nearly 30 dB. When operating in the controlled mode, the driving speaker is producing a sound pressure level more than three orders of magnitude below the natural duct uncontrolled level (both measured in the duct), so the effect is clearly not just acoustic cancellation. RP PARR, TP (reprint author), USN,CTR AIR WARFARE,DIV WEAP,RES DEPT,CODE 3892,CHINA LAKE,CA 93555, USA. NR 24 TC 3 Z9 3 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0748-4658 J9 J PROPUL POWER JI J. Propul. Power PD JUL-AUG PY 1993 VL 9 IS 4 BP 529 EP 535 DI 10.2514/3.23655 PG 7 WC Engineering, Aerospace SC Engineering GA LN143 UT WOS:A1993LN14300005 ER PT J AU ZVIRAN, M AF ZVIRAN, M TI A COMPREHENSIVE METHODOLOGY FOR COMPUTER FAMILY SELECTION SO JOURNAL OF SYSTEMS AND SOFTWARE LA English DT Article AB This article presents a selection methodology for a computer family. The proposed methodology incorporates the analytic hierarchy process into the evaluation procedure and helps organizations select a family of computers from a manufacturer's product line, rather than a specific computer model. The practice of computer selection and the existing solutions for a computer family selection procedure are briefly described. Then, Saaty's analytic hierarchy process is presented and incorporated into the selection methodology. The result is a structured and comprehensive methodology that allows decision makers to rank the alternatives more objectively and select a computer family that best fits the needs of the entire organization. Illustrative examples demonstrate the application of the various steps in the proposed methodology. C1 USN,POSTGRAD SCH,DEPT ADM SCI,MONTEREY,CA 93940. NR 16 TC 7 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0164-1212 J9 J SYST SOFTWARE JI J. Syst. Softw. PD JUL PY 1993 VL 22 IS 1 BP 17 EP 26 DI 10.1016/0164-1212(93)90119-I PG 10 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA LJ295 UT WOS:A1993LJ29500003 ER PT J AU FINETTE, S MIGNEREY, PC SMITH, JF RICHMOND, CD AF FINETTE, S MIGNEREY, PC SMITH, JF RICHMOND, CD TI BROAD-BAND SOURCE SIGNATURE EXTRACTION USING A VERTICAL ARRAY SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID FREQUENCY AB Source signatures have been extracted from acoustic data received on a large vertical array. Multichannel deconvolution methods were used in conjunction with broadband coherent and incoherent matched-field processors for source signature reconstruction. The signatures were generated by broadband (25-110 Hz) sources located near the first and second convergence zones, approximately 48 and 97 km from the array. Cross-correlation coefficients between known source signatures and deconvolved estimates indicate that faithful reconstructions of both magnitude and phase can be obtained. Use of incoherent noise components from the main diagonals of cross-spectral density matrices produced correlation coefficients ranging from 0.77 to 0.93. Degradation primarily appeared as increased noise in the reconstructed signature. Attempts to include the full spatial coherence of the ambient noise by using off-diagonal matrix components, resulted in correlation coefficients approximately 10% lower. This effect is caused by nonstationarities in the noise field which preclude using an ergodic hypothesis to obtain statistically reliable temporal averages for the cross-spectral density matrices. C1 MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139. RP FINETTE, S (reprint author), USN,RES LAB,DIV ACOUST,WASHINGTON,DC 20375, USA. NR 11 TC 9 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUL PY 1993 VL 94 IS 1 BP 309 EP 318 DI 10.1121/1.407097 PG 10 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LL825 UT WOS:A1993LL82500033 ER PT J AU GRAGG, RF WURMSER, D AF GRAGG, RF WURMSER, D TI LOW-FREQUENCY SCATTERING FROM INTERMEDIATE BUBBLE PLUMES - THEORY AND COMPUTATIONAL PARAMETER STUDY SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ACOUSTIC SCATTERING; OCEAN-SURFACE; 3 DIMENSIONS; RADIATION; CLOUDS; WAVES AB The acoustic field scattered from a bubble plume near the ocean surface is evaluated. It is assumed that the total field obeys the wave equation below a flat pressure-release air/sea interface, and that the interior of the plume can be represented by an effective sound-speed function. Green's function techniques are used to recast the problem so that the scattering amplitude, including resonance effects, is expressed in terms of equivalent source distributions that must satisfy a boundary integral equation on the surface of the plume. This equation is solved numerically. A wide range of choice is admitted for the various parameters of the problem. The dependence of the far-field scattering amplitude (or, equivalently, the target strength) on the plume's depth, shape, and interior sound-speed function is examined in the 50- to 500-Hz band for intermediate plumes (i.e., those with air void fractions between 0.01% and 1% and lifetimes as long as 10 s). RP GRAGG, RF (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 36 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 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUL PY 1993 VL 94 IS 1 BP 319 EP 329 DI 10.1121/1.407098 PG 11 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LL825 UT WOS:A1993LL82500034 ER PT J AU PENDERGRAFT, K PIEPER, R AF PENDERGRAFT, K PIEPER, R TI AN EXACT SOLUTION FOR A REFLECTION COEFFICIENT IN A MEDIUM HAVING AN EXPONENTIAL IMPEDANCE PROFILE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Letter ID DESIGN AB An exact analytical solution for the plane wave reflection coefficient in an isotropic, constant velocity medium exhibiting an exponential impedance space profile is derived. The analysis includes the effects of discontinuities at both boundaries of the impedance transformer. The derivation is based on an exact differential equation that describes the space evolution of the reflection coefficient along a nonuniform transmission line. Power transmission curves for various cases, including the exact quarterwave case, are presented. C1 USN,POSTGRAD SCH,DEPT ELECTR & COMP ENGN,MONTEREY,CA 93943. RP PENDERGRAFT, K (reprint author), IBM CORP,800 PK & HIGHWAY 54,RES TRIANGLE PK,NC 27709, 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 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUL PY 1993 VL 94 IS 1 BP 580 EP 582 DI 10.1121/1.407072 PG 3 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LL825 UT WOS:A1993LL82500061 ER PT J AU YU, HY SANDAY, SC RATH, BB AF YU, HY SANDAY, SC RATH, BB TI RESIDUAL-STRESSES IN CERAMIC INTERLAYER METAL JOINTS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID STEEL AB Thermal residual stresses due to the thermal expansion mismatch in a ceramic-interlayer-metal joint are calculated analytically. A qualitative estimate of the stress distribution is obtained by assuming the joint consists of one or two elastic slabs sandwiched between two semi-infinite isotropic elastic solids. These elastic solids and the interlayer(s) are perfectly bonded to each other at the planar interfaces. The region where temperature change takes place is assumed to be a cylinder with its axis normal to the interface. A simple equation is obtained for the stress value at the center of the ceramic-interlayer interface as a function of the thermal expansion coefficients, elastic constants of the constituent materials, and the thickness of the interlayer(s). The results obtained by this simple model agree well, qualitatively, with those obtained experimentally and numerically (finite element calculations). An appropriate interlayer material to reduce the residual stress in ceramic-metal joints is suggested. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 15 TC 15 Z9 19 U1 0 U2 6 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD JUL PY 1993 VL 76 IS 7 BP 1661 EP 1664 DI 10.1111/j.1151-2916.1993.tb06632.x PG 4 WC Materials Science, Ceramics SC Materials Science GA LZ493 UT WOS:A1993LZ49300002 ER PT J AU JEWELL, JM AF JEWELL, JM TI THERMOOPTIC COEFFICIENTS OF SODA LIME SILICA GLASSES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article AB The thermooptic coefficients, dn/dT, of two series of soda-lime-silica glasses, 25Na2O.xCaO.(75 - x)SiO2 and (25 -y)Na2O.yCaO.75SiO2, have been measured. When CaO is substituted for SiO2, the magnitude of dn/dT passes through a maximum negative value. When CaO is substituted for Na2O, there is a monotonic change from negative to positive dn/dT. These effects are accounted for by the changes in relative values of the coefficient of thermal expansion and the temperature coefficient of electronic polarizability, PHI. The effect of composition on PHI is explained by the changes in density of various nonbridging and bridging oxygens in the glass. RP JEWELL, JM (reprint author), USN,RES LAB,DIV OPT SCI,OPT MAT RES GRP,WASHINGTON,DC 20375, USA. NR 8 TC 3 Z9 3 U1 1 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 JUL PY 1993 VL 76 IS 7 BP 1855 EP 1856 DI 10.1111/j.1151-2916.1993.tb06659.x PG 2 WC Materials Science, Ceramics SC Materials Science GA LZ493 UT WOS:A1993LZ49300029 ER PT J AU CARTER, WH AF CARTER, WH TI COHERENCE PROPERTIES OF SOME BROAD-BAND HIGHLY COHERENT-LIGHT FIELDS SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article AB Coherence properties are studied for nonsinusoidal steady-state light fields, which have the property, that they produce nonsinusoidal traveling waves with the same time-dependent waveform throughout the far field of their sources. It is found that many such deterministic light fields can have frequency bandwidths that more than span the visible spectrum and can produce interference fringes with unit visibility if light from any pair of points in the far field is combined. However, the complex degree of coherence (in the space-time domain) for such fields over the far field is not unimodular. Thus these fields are not perfectly coherent according to the usual definition within the theory of partial coherence. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 9 TC 1 Z9 1 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3232 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD JUL PY 1993 VL 10 IS 7 BP 1570 EP 1578 DI 10.1364/JOSAA.10.001570 PG 9 WC Optics SC Optics GA LK097 UT WOS:A1993LK09700015 ER PT J AU RABINOVICI, R RUDOLPH, AS VERNICK, J FEUERSTEIN, G GERVIN, AS AF RABINOVICI, R RUDOLPH, AS VERNICK, J FEUERSTEIN, G GERVIN, AS TI A NEW SALUTARY RESUSCITATIVE FLUID - LIPOSOME-ENCAPSULATED HEMOGLOBIN HYPERTONIC SALINE SOLUTION SO JOURNAL OF TRAUMA-INJURY INFECTION AND CRITICAL CARE LA English DT Article; Proceedings Paper CT 52ND ANNUAL SESSION OF THE AMERICAN ASSOC FOR THE SURGERY OF TRAUMA CY SEP 17-19, 1992 CL LOUISVILLE, KY SP AMER ASSOC SURG TRAUMA ID HYPERTONIC SALINE; HEMORRHAGIC-SHOCK; SODIUM-CHLORIDE; BLOOD SUBSTITUTE; BIOLOGICAL RESPONSES; HEMOGLOBIN; DEXTRAN; RAT; HYPOTENSION; INFUSION AB Low-volume resuscitation with hypertonic (7.5%) saline (HTS) is an evolving therapeutic modality for patients with hemorrhagic shock. This solution has been shown to exert protective hemodynamic effects in models of controlled hemorrhagic shock and in several clinical trials. However, HTS has no oxygen-carrying capacity and therefore does not improve oxygen delivery directly. One of the leading strategies in developing an oxygen-carrying resuscitative fluid is the encapsulation of hemoglobin within phospholipid vesicles (LEH). This preparation has the advantage of being blood type and antigen free, easily adaptable to scale-up production, and remarkably stable with a long shelf life. We therefore tested the hypothesis that lyophilized LEH reconstituted with HTS will improve tissue oxygenation and survival in rats exposed to a lethal controlled hemorrhagic shock. Shock was induced by withdrawal of 70% of blood volume and therapy (n = 10-16) with HTS (5 mL/kg), LEH (5 mL/kg), lactated Ringer's solution (vol:vol = 1:3), LEH-HTS (5 mL/kg), or oxygen (100%) was initiated 15 minutes later. The LEH-HTS improved skeletal muscle oxygen tension directly measured using a thin-film chamber oxygen sensor (PO2 87 +/-13 mm Hg vs. 40-50 mm Hg in other groups, p < 0.05). This was associated with improved blood pressure, reduced acidosis, and increased survival at 24 hours (75% vs. 6%-25% in other groups, p < 0.05). In conclusion, the study demonstrates a remarkably salutary effect of LEH reconstituted with HTS as a blood substitute in the treatment of hemorrhagic shock. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. SMITHKLINE BEECHAM,KING OF PRUSSIA,PA. RP RABINOVICI, R (reprint author), THOMAS JEFFERSON UNIV,JEFFERSON MED COLL,DEPT SURG,DIV TRAUMA,1025 WALNUT ST,PHILADELPHIA,PA 19107, USA. NR 34 TC 49 Z9 51 U1 0 U2 1 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 1079-6061 J9 J TRAUMA JI J. Trauma-Injury Infect. Crit. Care PD JUL PY 1993 VL 35 IS 1 BP 121 EP 127 DI 10.1097/00005373-199307000-00019 PG 7 WC Critical Care Medicine; Surgery SC General & Internal Medicine; Surgery GA LP571 UT WOS:A1993LP57100019 PM 8331701 ER PT J AU JONKER, BT WARNOCK, J FU, LP YU, WY CHOU, WC PETROU, A AF JONKER, BT WARNOCK, J FU, LP YU, WY CHOU, WC PETROU, A TI ELECTRON AND HOLE SPIN LIFETIMES IN ZN1-XMNXSE AND ZN1-YFEYSE BASED HETEROSTRUCTURES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A LA English DT Article ID GAAS QUANTUM-WELLS; POLARIZATION SPECTROSCOPY; RELAXATION; EXCITONS; DYNAMICS; PHOTOLUMINESCENCE; SUPERLATTICES; LUMINESCENCE; CD1-XMNXTE; CARRIERS AB We have studied carrier spin relaxation in diluted magnetic semiconductor (DMS) epilayer and spin superlattice samples using polarization and magnetic field dependent photoluminescence. The giant Zeeman splitting of the DMS materials permits unambiguous identification of electron and hole excitonic spin relaxation times. We find that the heavy hole spin lifetime tau(hs) is comparable to the radiative recombination time tau(r), and substantially longer than the electron spin lifetime tau(es), with tau(hs)/tau(r) almost-equal-to 4 and tau(es)/tau(r) almost-equal-to 0.06. We attribute these long spin lifetimes to the strain induced splitting of the bulk degenerate light and heavy hole bands, which inhibits mixing of the hole spin states and subsequent heavy hole spin flip relaxation processes. In the regime of weak confinement, the spin relaxation times are independent of the degree of quantum confinement, the number of interfaces, the magnetic ion concentration, and the magnetic species. We conclude that spin flip via exchange scattering between the carriers and magnetic ions is not the dominant excitonic spin relaxation mechanism. C1 IBM CORP, THOMAS J WATSON RES CTR, YORKTOWN HTS, NY 10598 USA. SUNY Buffalo, BUFFALO, NY 14260 USA. RP JONKER, BT (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 33 TC 3 Z9 3 U1 0 U2 1 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A PD JUL-AUG PY 1993 VL 11 IS 4 BP 1033 EP 1038 DI 10.1116/1.578809 PN 1 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700055 ER PT J AU YOUCHISON, DL EDDY, CR SARTWELL, BD AF YOUCHISON, DL EDDY, CR SARTWELL, BD TI ROLE OF OXYGEN IN THE ELECTRON-CYCLOTRON-RESONANCE PLASMA-ASSISTED CHEMICAL-VAPOR-DEPOSITION OF DIAMOND FILMS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A LA English DT Article ID CVD; GROWTH AB The effects of oxygen on the electron cyclotron resonance plasma-assisted chemical vapor deposition of diamond films on Si(100) substrates have been investigated in the CH4:O2:H-2 system at 1.33 Pa and a substrate temperature of 500-degrees-C. Various [O]/[C] volume fractions ranging from 0.5 to 2.0 as determined by partial pressures were investigated while maintaining a constant [C]/[H-2] volume fraction of 0.67 for all depositions. Plasmas for each [o]/[q ratio were characterized with optical emission spectroscopy. The quality of the diamond films was evaluated with micro-Raman spectroscopy, x-ray diffraction (XRD), and scanning electron microscopy. It was discovered that microcrystalline graphite and nanocrystalline diamond in a cauliflowerlike morphology were produced at 0.5 < [O]/[C] < 0.7. Pronounced [111] faceting (approximately 0.3 mum grain size) with positive micro-Raman and XRD results were obtained for 0.7 < [O]/[C] < 1.2. For [O]/[C] > 1.2, a fewer number of larger grained (approximately 0.5-0.8 mum) crystallites formed in a matrix of fine-featured, renucleated diamond. Correlations between plasma and diamond film characteristics for various [O]/[C] ratios are presented. An empirical model which describes the production of hydrogen and atomic oxygen in an electron cyclotron resonance source from the dissociation of CH4 and O2, respectively, is also presented. RP YOUCHISON, DL (reprint author), USN, RES LAB, ION PLASMA PROC SECT, CODE 6675, WASHINGTON, DC 20375 USA. OI Youchison, Dennis/0000-0002-7366-1710 NR 24 TC 4 Z9 4 U1 0 U2 0 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A PD JUL-AUG PY 1993 VL 11 IS 4 BP 1875 EP 1880 DI 10.1116/1.578516 PN 2 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800044 ER PT J AU MALAFSKY, GP AF MALAFSKY, GP TI INFLUENCE OF THE XENON INDUCED WORK FUNCTION CHANGE ON THE XENON BINDING-ENERGY IN PHOTOEMISSION OF ADSORBED XENON SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A LA English DT Article ID METAL-SURFACES; INVERSE PHOTOEMISSION; ADSORPTION; XE AB Photoemission of adsorbed xenon has been shown to probe the local atomic work function. The Xe binding energy has a constant value relative to the vacuum level causing the measured binding energy relative to the Fermi level to vary with the work function of the adsorption site. The alignment of the Xe core level to the vacuum level should result in peak shifts with the work function change caused by the adsorbed Xe since the substrate vacuum level shifts with this work function change. However, the Xe peak positions are invariant to the work function changes and remain aligned to the work function of the clean substrate. It is shown in this article how this invariance creates a paradox for the model of the Xe core levels aligned to the vacuum level. The paradox arises from the simultaneous invariance of the Xe and the substrate core level binding energies to the work function change along with the modified threshold for secondary electron emission. The work function change is typically described by a dipole field created by the adsorbed atom. However, this dipole field would alter the kinetic energy of the substrate photoelectrons as well as the secondary electron threshold. A compensating change in the contact potential difference could make the measured substrate levels constant but this would require the Xe level to shift which they do not. This is the basis of the paradox which cannot be resolved by ascribing the work function change to an electrostatic field such as an adsorbed dipole or screening of the image charge. It is proposed that the work function change originates from the perturbation of the conduction electron wave function by the Xe adatom as described for the effect of Xe in scanning tunneling microscopy. RP MALAFSKY, GP (reprint author), USN, RES LAB, DIV CHEM, WASHINGTON, DC 20375 USA. NR 18 TC 4 Z9 4 U1 0 U2 3 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 0734-2101 EI 1520-8559 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A PD JUL-AUG PY 1993 VL 11 IS 4 BP 2158 EP 2161 DI 10.1116/1.578385 PN 2 PG 4 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800094 ER PT J AU PELLEGRINO, JG QADRI, SB COTELL, CM AMIRTHARAJ, PM NGUYEN, NV COMAS, J AF PELLEGRINO, JG QADRI, SB COTELL, CM AMIRTHARAJ, PM NGUYEN, NV COMAS, J TI INTERFACE SHARPNESS DURING THE INITIAL-STAGES OF GROWTH OF THIN, SHORT-PERIOD III-V SUPERLATTICES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID RAY AB Superlattices composed of III-V heterostructures have established applications in high-speed electronic and optoelectronic devices. As layer thicknesses are reduced, the role of heterostructure interface sharpness becomes more critical to ensuring high quality two-dimensional growth. In this work, short-period (less than 1 nm) superlattices with active layer thicknesses of 31 nm were investigated to assess interface roughness in the initial stages of growth. X-ray diffraction was used to evaluate interface roughness and to calculate superlattice periodicity. Results suggest that surface roughening by islanding may be promoted by GaAs buffer layers that are 10-100 nm thick. Smoother interfaces were obtained in samples with buffer layers 250 nm and greater. C1 USN,RES LAB,DIV CONDENSED MATTER,WASHINGTON,DC 20375. NATL INST STAND & TECHNOL,DIV SEMICOND ELECTR,GAITHERSBURG,MD 20899. RP PELLEGRINO, JG (reprint author), NATL INST STAND & TECHNOL,DIV SEMICOND ELECTR,GAITHERSBURG,MD 20899, USA. NR 11 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 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 917 EP 922 DI 10.1116/1.578327 PN 1 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700034 ER PT J AU WANG, WC DURA, JA ZBOROWSKI, JT VIGLIANTE, A CHEN, HC GOLDING, TD MEYER, JR AF WANG, WC DURA, JA ZBOROWSKI, JT VIGLIANTE, A CHEN, HC GOLDING, TD MEYER, JR TI PREPARATION OF SB/GASB(111)-ORIENTED MULTILAYER STRUCTURES USING MOLECULAR-BEAM EPITAXY AND MIGRATION-ENHANCED EPITAXY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID TRANSPORT-PROPERTIES; GROWTH AB We have performed an investigation into the synthesis of Sb/GaSb heterojunctions and multilayers using the technique of molecular-beam epitaxy. The GaSb/Sb system has a number of unique features relevant to synthesis of an epitaxial semimetal/semiconductor system. On the (111) plane of the rhombohedral crystal structure of Sb, both the hexagonal symmetry and in plane lattice parameter allow near perfect registry to the Sb atoms on the (111) plane of the zinc blende structure of GaSb. This study shows that Sb can be grown epitaxially on GaSb{111} oriented epilayers and that GaSb can be subsequently grown on the Sb epilayers at temperatures < 300-degrees-C by migration enhanced epitaxy. Growth and resultant film properties have been characterized by reflection high-energy electron diffraction, x-ray diffraction, x-ray photoelectron spectroscopy, and Hall. C1 UNIV HOUSTON,CTR SPACE VACUUM EPITAXY,HOUSTON,TX 77204. USN,RES LAB,WASHINGTON,DC 20375. RP WANG, WC (reprint author), UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204, USA. RI Dura, Joseph/B-8452-2008 OI Dura, Joseph/0000-0001-6877-959X NR 13 TC 3 Z9 3 U1 1 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 JUL-AUG PY 1993 VL 11 IS 4 BP 1001 EP 1005 DI 10.1116/1.578803 PN 1 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP007 UT WOS:A1993LP00700049 ER PT J AU MINTMIRE, JW AF MINTMIRE, JW TI 1ST-PRINCIPLES ELECTRONIC-PROPERTIES OF MODEL SILICON-BASED QUANTUM WIRES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID VISIBLE-LIGHT EMISSION; POROUS SILICON; OPTICAL-PROPERTIES; PHOTOLUMINESCENCE; POLYSILANES; SPECTRA; POLYACETYLENE AB Porous silicon materials created by etching with hydrofluoric acid solutions exhibit an anomalous photoluminescence intensity. One proposed origin of this behavior has been quantum size effects in silicon fibers with nanometer-scale diameter in the porous silicon material. We present first-principles results for the electronic structure and selected electronic properties-in particular for the optical absorption-of silicon fibers chosen as chemically realistic models of quantum wires. RP MINTMIRE, JW (reprint author), USN,RES LAB,DIV CHEM,CODE 6170,WASHINGTON,DC 20375, USA. OI Mintmire, John/0000-0002-6551-0349 NR 20 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 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1993 VL 11 IS 4 BP 1733 EP 1735 DI 10.1116/1.578487 PN 2 PG 3 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800018 ER PT J AU EDDY, CR DOBISZ, EA MEYER, JR HOFFMAN, CA AF EDDY, CR DOBISZ, EA MEYER, JR HOFFMAN, CA TI ELECTRON-CYCLOTRON-RESONANCE REACTIVE ION ETCHING OF FINE FEATURES IN HGXCD1-XTE USING CH4/H2 PLASMAS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID SECONDARY AFTERGLOW REACTOR; METHANE; HYDROGEN; INP; SEMICONDUCTORS; GAAS; PASSIVATION AB To date, most dry etching of mercury cadmium telluride (MCT) has involved fabrication of conventional devices, whose minimum feature size is several tens of micrometers. Recent theoretical work has predicted novel effects in nanometer-scale devices making the ability to fabricate nanometer-scale features in narrow band-gap semiconductors such as MCT desirable. As MCT has a very low threshold for damage, realization of either conventional or nanometer size devices requires reduced, controllable ion energies and improved understanding of the etch processes involved. This work presents the results of parametric studies of the etching of MCT using an electron cyclotron resonance (ECR) microwave plasma source and CH4/H-2 gas mixtures. The current work is focused on the application of ECR etching for the nanofabrication of MCT. The parameters investigated include % CH4 in H-2 (10 to 25); ion energy (0 to 100 eV); pressure (0.10 to 1.0 mTorr), and substrate position with respect to the ECR condition. Optimized process conditions are total gas pressure of 0.50 mTorr, 18% CH4 in H-2, almost-equal-to - 100 V ion energy, and a 32 cm ECR-sample separation. These conditions have produced etch rates of up to 1500 angstrom/min and etch features with sidewall angles of > 88-degrees. Feature sizes from 40 nm to 2.0 mum have been investigated. C1 USN,RES LAB,CODE 6864,WASHINGTON,DC 20375. USN,RES LAB,CODE 5651,WASHINGTON,DC 20375. RP EDDY, CR (reprint author), USN,RES LAB,CODE 6675,WASHINGTON,DC 20375, USA. RI Schaff, William/B-5839-2009 NR 28 TC 32 Z9 32 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 JUL-AUG PY 1993 VL 11 IS 4 BP 1763 EP 1767 DI 10.1116/1.578421 PN 2 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800024 ER PT J AU WOICIK, JC KENDELEWICZ, T HERRERAGOMEZ, A ANDREWS, AB KIM, BS COWAN, PL MIYANO, KE BOULDIN, CE KARLIN, BA HERMAN, GS ERSKINE, JL PIANETTA, P SPICER, WE AF WOICIK, JC KENDELEWICZ, T HERRERAGOMEZ, A ANDREWS, AB KIM, BS COWAN, PL MIYANO, KE BOULDIN, CE KARLIN, BA HERMAN, GS ERSKINE, JL PIANETTA, P SPICER, WE TI ADATOM LOCATION ON THE SI(111) 7X7 AND SI(111) ROOT-3X-ROOT-3-IN SURFACES BY THE X-RAY STANDING-WAVE AND PHOTOEMISSION TECHNIQUES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 39TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 09-13, 1992 CL CHICAGO, IL SP AMER VACUUM SOC ID ABSORPTION FINE-STRUCTURE; SILICON 111 SURFACE; RECONSTRUCTION; GAAS(110); STATES; SB AB The x-ray standing wave technique has been used to determine the adatom positions on the Si(111) 7 X 7 and Si(111) square-root 3 X square-root 3-In surfaces. By monitoring the intensity of the surface sensitive Si Is photopeak as a function of photon energy around the Si(111) Bragg backreflection condition, we determine the Si adatoms of the clean 7 X 7 surface to reside 1.69+/-0.1 angstrom above the extrapolated Si(111) bulk plane. In contrast, the In adatoms on the 1/3 monolayer square-root 3 X square-root 3-In surface are found to remove the Si displacements and lie at a position of 2.11+/-0.05 angstrom. High-resolution Si 2p core-level measurements support the T4 geometry for the In adatom location. C1 STANFORD UNIV,ELECTR LAB,STANFORD,CA 94305. UNIV TEXAS,AUSTIN,TX 78712. ARGONNE NATL LAB,ARGONNE,IL 60439. TULANE UNIV,DEPT PHYS,NEW ORLEANS,LA 70118. NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. USN,RES LAB,WASHINGTON,DC 20375. RP WOICIK, JC (reprint author), NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899, USA. NR 23 TC 9 Z9 9 U1 1 U2 2 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 JUL-AUG PY 1993 VL 11 IS 4 BP 2359 EP 2363 DI 10.1116/1.578333 PN 2 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA LP008 UT WOS:A1993LP00800130 ER PT J AU GODBEY, DJ ANCONA, MG AF GODBEY, DJ ANCONA, MG TI CONCENTRATION-DEPENDENCE OF GE SEGREGATION DURING THE GROWTH OF A SIGE BURIED LAYER SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 20TH ANNUAL CONF ON THE PHYSICS AND CHEMISTRY OF SEMICONDUCTOR INTERFACES CY JAN 25-29, 1993 CL WILLIAMSBURG, VA SP AMER VACUUM SOC, AMER PHYS SOC, USN, OFF NAVAL RES, USAF, OFF SCI RES, XEROX CORPORATE RES & TECHNOL ID MOLECULAR-BEAM EPITAXY; SURFACE SEGREGATION; SI(100) AB X-ray photoelectron spectroscopy (XPS) measurements of a series of films with varying x and cap thicknesses were made to determine the Ge profile in both thin Si cap layers and the Si1-xGex buried layers grown at 500-degrees-C. The inelastic mean free path of 267 eV electrons through a silicon overlayer was measured to be 1.2 nm. The Ge profile was inferred by simulating the surface segregation process using a two-state exchange mechanism, and comparing the expected XPS spectra to the obtained data. The resulting model predicts a floating surface layer rich in Ge during the growth of the Si1-xGex layer and the Si cap that results in distortion of both interfaces of the buried layer. The interface formed upon beginning the growth of the buried Si1-xGex layer can be wide, and estimates of the width of the ''leading'' interface range from approximately 20 monolayers (MLs) for an x = 0.05 layer, and approximately 10 MLs for an x = 0.1 layer grown at 500-degrees-C. RP GODBEY, DJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 28 Z9 28 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD JUL-AUG PY 1993 VL 11 IS 4 BP 1392 EP 1395 DI 10.1116/1.586947 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA LT450 UT WOS:A1993LT45000028 ER PT J AU KNIPP, PA REINECKE, TL AF KNIPP, PA REINECKE, TL TI BARRIER MODULATED SEMICONDUCTOR QUANTUM WIRES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 20TH ANNUAL CONF ON THE PHYSICS AND CHEMISTRY OF SEMICONDUCTOR INTERFACES CY JAN 25-29, 1993 CL WILLIAMSBURG, VA SP AMER VACUUM SOC, AMER PHYS SOC, USN, OFF NAVAL RES, USAF, OFF SCI RES, XEROX CORPORATE RES & TECHNOL AB Calculations of the electronic states and transition energies of a novel kind of barrier modulated semiconductor quantum wire have been made by solving the two-dimensional Schrodinger equation numerically. Laterally confined electronic states are found with energy spacings up to 10 meV for wire widths down to 250 angstrom. The results for the transition energies are shown to be in good agreement with recent photoluminescence data for GaAs/InGaAs/GaAs quantum wires using the wire widths measured m scanning electron microscopy. This agreement indicates that these wires have negligible optically inactive dead layers and that their electronic and optical properties are well understood. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KNIPP, PA (reprint author), CHRISTOPHER NEWPORT UNIV,DEPT PHYS & COMP SCI,NEWPORT NEWS,VA 23606, USA. NR 5 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 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD JUL-AUG PY 1993 VL 11 IS 4 BP 1667 EP 1669 DI 10.1116/1.586500 PG 3 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA LT450 UT WOS:A1993LT45000080 ER PT J AU HEMSTREET, LA FONG, CY NELSON, JS AF HEMSTREET, LA FONG, CY NELSON, JS TI EFFECT OF INTERFACIAL BOND TYPE ON THE ELECTRONIC AND STRUCTURAL-PROPERTIES OF GASB/INAS SUPERLATTICES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 20TH ANNUAL CONF ON THE PHYSICS AND CHEMISTRY OF SEMICONDUCTOR INTERFACES CY JAN 25-29, 1993 CL WILLIAMSBURG, VA SP AMER VACUUM SOC, AMER PHYS SOC, USN, OFF NAVAL RES, USAF, OFF SCI RES, XEROX CORPORATE RES & TECHNOL ID QUASIPARTICLE ENERGIES; MOLECULAR-DYNAMICS; BAND-GAPS; PSEUDOPOTENTIALS; SEMICONDUCTORS; POTENTIALS; INSULATORS AB We have investigated the effects of interfacial bond configuration on the electronic and structural properties of thin (001)GaSb/InAs superlattices by using state-of-the-art ab initio molecular dynamics techniques to calculate the electronic and structural properties of two twelve-atom model GaSb/InAs superlattices which have been constructed to contain only In-Sb (model 1) or Ga-As (model 2) interface bonds, respectively. We find the strain at the the interface to be different in the two cases. In model 1, the In and Sb atoms at the interface move away from each other toward the InAs and GaSb layers, respectively, increasing the interfacial separation (4.3 % greater than in bulk InSb) and compressing the back bonds to the atoms in the layer below the interface. In model 2 the Ga and As atoms move toward each other, decreasing the interplanar separation at the interface (3.2% smaller than in bulk GaAs) and stretching the back bonds to the neighboring Sb and In atoms, respectively. We calculate the valence band offset for the Ga-As bonded structure to be 0. 15 eV smaller than that for the model containing only In-Sb bonds. This smaller band offset leads to more mixing of As p character into the highest lying valence band of the superlattice and results in a 0.015 eV smaller spin-orbit splitting at the valence band edge of the Ga-As bonded structure. This result is consistent with the 0.05 eV larger band pp observed for Ga-As bonded structures in recent photoconductivity measurements made on both Ga-As and In-Sb bonded samples grown by molecular-beam epitaxy. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP HEMSTREET, LA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 19 TC 17 Z9 17 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD JUL-AUG PY 1993 VL 11 IS 4 BP 1693 EP 1696 DI 10.1116/1.586506 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA LT450 UT WOS:A1993LT45000086 ER PT J AU MEISENBERG, BR MONROY, RL MELARAGNO, AJ AF MEISENBERG, BR MONROY, RL MELARAGNO, AJ TI GRANULOCYTE-COLONY-STIMULATING FACTOR (G-CSF) FOR MUSTARD-INDUCED BONE-MARROW SUPPRESSION SO MILITARY MEDICINE LA English DT Article AB The authors describe the development of a clinical protocol to treat mustard gas-induced myelosuppression with granulocyte colony stimulating factor (G-CSF), a hematopoietic growth factor. Limited clinical evidence suggests a significant role for mustard gas-induced myelosuppression in the overall morbidity of mustard gas victims. Initial data from primates revealed that G-CSF could ameliorate neutropenia following nitrogen mustard exposure. Exploiting the extensive oncologic experience with G-CSF, which demonstrated its safety and absence of serious side effects the authors developed a clinical protocol for use of this drug in potential mustard gas victims in the Persian Gulf conflict. C1 USN HOSP,DEPT INTERNAL MED,DIV HEMATOL ONCOL,SAN DIEGO,CA 92134. NR 0 TC 7 Z9 7 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD JUL PY 1993 VL 158 IS 7 BP 470 EP 474 PG 5 WC Medicine, General & Internal SC General & Internal Medicine GA LM843 UT WOS:A1993LM84300013 PM 7688884 ER PT J AU HIBBS, RG AF HIBBS, RG TI NAMRU-3 - 46 YEARS OF INFECTIOUS-DISEASE RESEARCH SO MILITARY MEDICINE LA English DT Article AB The United States Naval Medical Research Unit No. 3 (NAMRU-3), Cairo, Egypt, has been in continuous operation studying infectious diseases of military importance since its establishment in 1946, even during the lapse in diplomatic relations from 1967-1974. Other overseas research laboratories of the Naval Medical Research and Development Command include NAMRU-2 in Jakarta, Indonesia, with a detachment in Manila, and the Naval Medical Research Institute Detachment Lima, Peru. Comparable U.S. Army overseas research laboratories are located in Thailand, Brazil, Korea, and Kenya. Department of Defense overseas laboratories conduct research on infections diseases endemic to their respective geographic regions which could adversely impact on the health of deployed military forces. This article describes the history of one such laboratory, NAMRU-3, and the important infectious disease research it conducts to enhance the health of military forces deployed to its strategic geographical region of the world. C1 USN,MED RES UNIT 3,CAIRO,EGYPT. NR 0 TC 2 Z9 2 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD JUL PY 1993 VL 158 IS 7 BP 484 EP 488 PG 5 WC Medicine, General & Internal SC General & Internal Medicine GA LM843 UT WOS:A1993LM84300017 PM 8351052 ER PT J AU OWENS, WA AF OWENS, WA TI THE REQUIREMENT SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP OWENS, WA (reprint author), USN,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1993 VL 105 IS 4 BP 36 EP 38 PG 3 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU896 UT WOS:A1993LU89600003 ER PT J AU KALLERES, MP AF KALLERES, MP TI THE RESPONSE SO NAVAL ENGINEERS JOURNAL LA English DT Article RP KALLERES, MP (reprint author), USN,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1993 VL 105 IS 4 BP 39 EP 41 PG 3 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU896 UT WOS:A1993LU89600004 ER PT J AU MALLEY, KC AF MALLEY, KC TI THE RESPONSE SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP MALLEY, KC (reprint author), USN,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1993 VL 105 IS 4 BP 42 EP 43 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU896 UT WOS:A1993LU89600005 ER PT J AU BOWES, WC AF BOWES, WC TI ASNE LUNCHEON ADDRESS SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP BOWES, WC (reprint author), USN,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1993 VL 105 IS 4 BP 48 EP 52 PG 5 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU896 UT WOS:A1993LU89600008 ER PT J AU REASON, JP AF REASON, JP TI ASNE DAY BANQUET SPEECH SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP REASON, JP (reprint author), USN,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1993 VL 105 IS 4 BP 53 EP 54 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU896 UT WOS:A1993LU89600009 ER PT J AU SMITH, CJ AF SMITH, CJ TI ACKNOWLEDGMENTS AND PROCEEDINGS SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP SMITH, CJ (reprint author), USN,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1993 VL 105 IS 4 BP 55 EP 63 PG 9 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU896 UT WOS:A1993LU89600010 ER PT J AU ARGIRO, LJ AF ARGIRO, LJ TI THE SAUNDERS,HAROLD,E. AWARD FOR 1992 SO NAVAL ENGINEERS JOURNAL LA English DT Article RP ARGIRO, LJ (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,ANNAPOLIS,MD 21402, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1993 VL 105 IS 4 BP 73 EP 74 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU896 UT WOS:A1993LU89600012 ER PT J AU BANNISTER, PR AF BANNISTER, PR TI THE SOLBERG AWARD FOR 1992 SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP BANNISTER, PR (reprint author), USN,NAVAL UNDERSEA WARFARE CTR DETACHMENT,NEW LONDON,CT, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1993 VL 105 IS 4 BP 80 EP 80 PG 1 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU896 UT WOS:A1993LU89600016 ER PT J AU MCDONNELL, JT KRAMER, D AF MCDONNELL, JT KRAMER, D TI INFORMATION TECHNOLOGY INSERTION - KEY SYSTEM ENGINEERING ELEMENT FOR AFFORDABLE, MISSION FLEXIBLE SHIPS - COMMENT SO NAVAL ENGINEERS JOURNAL LA English DT Note RP MCDONNELL, JT (reprint author), USN,SEA SYST COMMAND INTEGRATED COMBAT SYST & FIBER OPT BRANCH,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1993 VL 105 IS 4 BP 90 EP 92 PG 3 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU896 UT WOS:A1993LU89600019 ER PT J AU WINTERSTEEN, BD HOCKBERGER, WA AF WINTERSTEEN, BD HOCKBERGER, WA TI NAVAL SURFACE COMBATANT SHIP DESIGNERS AID - COMMENT SO NAVAL ENGINEERS JOURNAL LA English DT Note RP WINTERSTEEN, BD (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,DESIGN ANAL & TOOLS BRANCH,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1993 VL 105 IS 4 BP 96 EP 98 PG 3 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU896 UT WOS:A1993LU89600021 ER PT J AU VALDES, EL AF VALDES, EL TI AN APPROACH TO TURN-KEY COMMUNICATIONS SUITES FOR NEW CONSTRUCTION SHIPS - COMMENT SO NAVAL ENGINEERS JOURNAL LA English DT Note RP VALDES, EL (reprint author), USN,DIV DESTROYER,AEGIS PROGRAM,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1993 VL 105 IS 4 BP 103 EP 105 PG 3 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU896 UT WOS:A1993LU89600024 ER PT J AU NANOS, GP SKOLNICK, A AF NANOS, GP SKOLNICK, A TI NAVY HIGH-ENERGY LASER-WEAPON SYSTEM - COMMENT SO NAVAL ENGINEERS JOURNAL LA English DT Note RP NANOS, GP (reprint author), USN,STRATEG SYST PROGRAMS OFF,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1993 VL 105 IS 4 BP 105 EP 109 PG 5 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU896 UT WOS:A1993LU89600025 ER PT J AU JACOBS, KS AF JACOBS, KS TI SYSTEM CALIBRATION OF AUTOMATED MACHINERY CONTROLS - COMMENT SO NAVAL ENGINEERS JOURNAL LA English DT Note RP JACOBS, KS (reprint author), USN,SEA SYST COMMAND,DIV SURFACE SHIP MAINTENANCE SEA 915,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1993 VL 105 IS 4 BP 110 EP 111 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU896 UT WOS:A1993LU89600026 ER PT J AU SPRANGLE, P HAFIZI, B JOYCE, G SERAFIM, P AF SPRANGLE, P HAFIZI, B JOYCE, G SERAFIM, P TI ELECTRON-BEAM QUALITY LIMITATIONS AND BEAM CONDITIONING IN FREE-ELECTRON LASERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID NON-LINEAR THEORY; EFFICIENCY ENHANCEMENT; WAVELENGTH; WIGGLERS AB Free electron lasers (FELs) operate over a large portion of the electromagnetic spectrum, i.e. from the mu-wave to the UV. At the high frequency end of the spectrum, FEL operation is severely limited by a number of factors; prominent among them is the electron beam quality (electron axial velocity spread). The axial velocity spread is due to the electron beam's intrinsic energy spread and emittance. The general wavelength limitation in FELs due to electron beam quality is discussed. A method for reducing the axial velocity spread is proposed and analysed. This beam conditioning method redistributes the electrons' energy according to their betatron amplitude. This is accomplished by interacting the beam with an axially symmetric, slow, TM waveguide mode. RP SPRANGLE, P (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 17 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 6 EP 11 DI 10.1016/0168-9002(93)90005-3 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800003 ER PT J AU ROBERSON, CW HAFIZI, B AF ROBERSON, CW HAFIZI, B TI FREE-ELECTRON LASER SCALING WITH EMITTANCE AND ENERGY SPREAD SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID GAIN AB Emittance and energy spread provide limitations in the scaling of free-electron lasers to short wavelengths or low voltages. We have investigated this scaling in a gain-focused free-electron laser. The variation in the growth rate, radius of curvature of wavefronts, filling factor and efficiency with emittance and energy spread has been calculated. For small increases in emittance or energy spread we obtain the unusual result that the efficiency can increase with emittance or energy spread. We find that the rule of thumb lambda = piepsilon overestimates the emittance by 1-2 orders of magnitude. In the cold beam limit the filling factor is small compared to unity. C1 USN,RES LAB,BEAM PHYS BRANCH,WASHINGTON,DC 20375. ICARUS RES,BETHESDA,MD 20814. RP ROBERSON, CW (reprint author), OFF NAVAL RES,DIV PHYS,ARLINGTON,VA 22217, USA. NR 5 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 JUL 1 PY 1993 VL 331 IS 1-3 BP 365 EP 370 DI 10.1016/0168-9002(93)90073-Q PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800073 ER PT J AU TANG, CM HAFIZI, B RIDE, SK AF TANG, CM HAFIZI, B RIDE, SK TI THOMSON BACKSCATTERED X-RAYS FROM AN INTENSE LASER-BEAM SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID FREE-ELECTRON LASERS; RADIATION AB We have formulated and obtained analytical expressions for Thomson backscattered X-ray radiation for an electron beam incident on a linearly polarized electromagnetic undulator at a small angle. The analytical expressions are valid for fundamental and harmonics with arbitrarily large laser intensities. The intensity distribution pattern is evaluated numerically. C1 ICARUS RES,BETHESDA,MD 20814. UNIV CALIF SAN DIEGO,DEPT PHYS 0319,LA JOLLA,CA 92093. RP TANG, CM (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 16 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 371 EP 378 DI 10.1016/0168-9002(93)90074-R PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800074 ER PT J AU FREUND, HP JACKSON, RH AF FREUND, HP JACKSON, RH TI SELF-CONSISTENT ANALYSIS OF THE EFFECT OF WIGGLER FIELD ERRORS IN FREE-ELECTRON LASERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID MAGNETIC-FIELD; RADIATION AB A self-consistent analysis of wiggler field errors in free-electron lasers is described using the 3-D simulation code WIGGLIN, and a random variation for the pole-to-pole wiggler amplitude with a continuous map between the pole faces. On average, increases in the rms value of the field cause a decrease in the interaction efficiency; however, this is relatively benign for the specific case studied, and particular error distributions can result in efficiency enhancements. The analysis indicates that a random walk model for electron orbits may be conceptually incorrect. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. RP FREUND, HP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 461 EP 466 DI 10.1016/0168-9002(93)90089-Z PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800089 ER PT J AU FREUND, HP AF FREUND, HP TI SPACE-CHARGE EFFECTS IN FREE-ELECTRON LASERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID NONLINEAR-ANALYSIS; AMPLIFIER; BEAM; MILLIMETER; SIMULATION; REGIME; FIELD; GAIN AB The questions of the importance and proper description of space-charge effects in free-electron lasers are addressed. The collective Raman regime occurs in free-electron lasers when the electron charge density is sufficiently high that the space-charge potential associated with the beam space-charge waves becomes dominant over the ponderomotive potential. The theoretical nonlinear treatment of collective effects in three-dimensions is discussed, and four intense electron beam experiments are analyzed with the objective of determining the importance of Raman effects on the interactions. Three of these experiments used a helical wiggler and an axial guide field, while the fourth used a planar wiggler. For each of these experiments, the usual well-known Raman/Compton criterion predicts that space-charge effects will be important. However, a three-dimensional analysis of these experiments indicates that only two of these experiments were in the Raman regime. Three essential conclusions are drawn. First, the usual Raman/Compton criterion which was derived via an idealized one-dimensional analysis must be used with caution since three-dimensional effects can alter the relative importance of the ponderomotive and space-charge potentials. In addition, 1) the Raman shift in the resonance condition must be greater than the FEL linewidth, and 2) Landau damping of the space-charge waves must be small in order for space-charge effects to be important. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. RP FREUND, HP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 496 EP 500 DI 10.1016/0168-9002(93)90096-Z PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800096 ER PT J AU GANGULY, AK FREUND, HP AF GANGULY, AK FREUND, HP TI 3-DIMENSIONAL NONLINEAR SIMULATION OF A HIGH-POWER COLLECTIVE FREE-ELECTRON LASER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID MAGNETIC-FIELD; MICROWAVE-RADIATION; AMPLIFIER; MILLIMETER; WIGGLER AB A comparison is described between the three-dimensional nonlinear analysis and simulation code ARACHNE and a recent 33.4 GHz collective free-electron laser amplifier experiment at MIT. The experiment has demonstrated power levels of 61 MW ( almost-equal-to 27% efficiency). The electron beam propagated through a cylindrical drift tube in the presence of a helical wiggler and an axial guide magnetic field. When the wiggler and guide fields were parallel, observed power levels reached approximately 4 MW but vanished in the neighborhood of the magnetic resonance when the Larmor and wiggler periods are comparable. However, maximum power was observed in the reversed field case when the wiggler and guide fields were antiparallel. In this case, a significant reduction in the output power was found to occur in the neighborhood of the anti-resonance. ARACHNE is in substantial agreement with the experiment. In the reversed field case, the simulation shows peak power levels of 60 MW, as well as providing good correspondence with the power reduction at the anti-resonance. Agreement when the wiggler and guide fields are parallel, however, requires the assumption of a substantial increase in the energy spread of the beam. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. RP GANGULY, AK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 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 JUL 1 PY 1993 VL 331 IS 1-3 BP 501 EP 504 DI 10.1016/0168-9002(93)90097-2 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800097 ER PT J AU COLSON, WB GATELY, B CAUDLE, DL STURGESS, K AF COLSON, WB GATELY, B CAUDLE, DL STURGESS, K TI ANALOGIES BETWEEN THE FREE-ELECTRON LASER AND WHISTLER-MODE AMPLIFICATION IN THE IONOSPHERE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN AB Very low frequency (VLF) electromagnetic waves, called ''whistler waves'', propagating along magnetic field lines in the magnetosphere can be amplified by energetic electrons spiraling around the field lines near the geomagnetic equator. The electron and whistler wave interaction can be described by a theoretical model much like that used for the free electron laser (FEL). The electron phase-space dynamics for both interactions is governed by the pendulum equation describing saturation, electron trapping, tapering and sensitivity to energy distributions. RP COLSON, WB (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 8 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 JUL 1 PY 1993 VL 331 IS 1-3 BP 522 EP 526 DI 10.1016/0168-9002(93)90102-N PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800102 ER PT J AU ESAREY, E SPRANGLE, P TING, A RIDE, SK AF ESAREY, E SPRANGLE, P TING, A RIDE, SK TI LASER SYNCHROTRON-RADIATION AS A COMPACT SOURCE OF TUNABLE, SHORT-PULSE HARD X-RAYS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID FREE-ELECTRON LASER; GAIN AB A compact laser synchrotron source (LSS) is proposed as a means of generating tunable. narrow bandwidth, ultrashort pulses of hard X-rays. The LSS is based on the Thomson backscattering of intense laser radiation from a counterstreaming electron beam. Advances in both compact ultraintense solid-state lasers and high brightness rf linac beams make the LSS an attractive compact source of high brightness X-rays, particularly at photon energies beyond approximately 30 keV. The spectral flux, brightness. bandwidth and pulse structure are analyzed. In the absence of filtering the spectral bandwidth in the LSS is typically less than or similar to l% and is limited by electron beam emittance and energy spread. Two configurations of the LSS are discussed, one providing high peak power and the other high average power. C1 UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. UNIV CALIF SAN DIEGO,CALIF SPACE INST,LA JOLLA,CA 92093. RP ESAREY, E (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 18 TC 30 Z9 30 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 545 EP 549 DI 10.1016/0168-9002(93)90107-S PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800107 ER PT J AU BLAU, J FROST, DJ COLSON, WB AF BLAU, J FROST, DJ COLSON, WB TI MICROPULSE SLIPPAGE AND OPTICAL-MODE DISTORTION IN THE BOEING APLE AMPLIFIER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN ID ELECTRON AB In the Boeing Average Power Laser Experiment (APLE), the free electron laser (FEL) oscillator produces short optical pulses for input to the amplifier section. Micropulse slippage can become significant in the amplifier, competing with the effects of high gain and optical mode distortion. A two-dimensional simulation is used to study pulse slippage, and a three-dimensional simulation is used to study mode distortion. A four-dimensional simulation is used to simultaneously study these effects, and to look at the sensitivity of the efficiency to changes in various FEL parameters. We find that high gain and mode distortion effects dominate the pulse slippage effects. The amplifier is fairly insensitive to beam quality degradation and changes in the initial optical field, but a significant improvement in efficiency could be achieved by shortening the electron pulse. RP BLAU, J (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 645 EP 649 DI 10.1016/0168-9002(93)90128-5 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800128 ER PT J AU STURGESS, KA FROST, DJ COLSON, WB AF STURGESS, KA FROST, DJ COLSON, WB TI SHORT-PULSE EVOLUTION IN THE BOEING APLE OSCILLATOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN AB The Boeing average power laser experiment (APLE) oscillator is investigated using two- and three-dimensional simulations. The evolution of optical pulses in the presence of an electron pulse energy slew is examined. The most stable operation of the oscillator is found for larger values of desynchronism where the electron energy spread is minimized in preparation for input into the high power amplifier. RP STURGESS, KA (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 650 EP 653 DI 10.1016/0168-9002(93)90129-6 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800129 ER PT J AU WALLACE, SM COLSON, WB NEIL, GR HARWOOD, L AF WALLACE, SM COLSON, WB NEIL, GR HARWOOD, L TI MAGNETIC-FIELD ERROR MEASUREMENT OF THE CEBAF (NIST) WIGGLER USING THE PULSED WIRE METHOD SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 92 ) CY AUG 23-28, 1992 CL KOBE, JAPAN SP SCI & TECHNOL AGCY, MINIST EDUC SCI & CULTURE JAPAN, MINIST INT TRADE & IND JAPAN, OSAKA PREFECTURE, HYOGO PREFECTURE, KOBE CITY, FDN OSAKA SCI & TECHNOL CTR, JAPAN ATOM ENERGY RES INST, JAPAN SYNCHROTON RADIAT RES INST, NISHIHARIMA TECHNOPOLIS FDN AB The National Institute for Science and Technology (NIST) wiggler has been loaned to the Continuous Electron Beam Accelerator Facility (CEBAF). The pulsed wire method [R.W. Warren, Nucl. Instr. and Meth. A272 (1988) 267] has been used to measure the field errors of the entrance wiggler half, and the net path deflection was calculated to be DELTAx almost-equal-to 5.2 mm. C1 CONTINUOUS ELECTRON BEAM ACCELERATOR FACIL,NEWPORT NEWS,VA 23606. RP WALLACE, SM (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 6 TC 6 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1993 VL 331 IS 1-3 BP 759 EP 762 DI 10.1016/0168-9002(93)90152-8 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK378 UT WOS:A1993LK37800152 ER PT J AU CANFIELD, JL AF CANFIELD, JL TI RECENT DEVELOPMENTS IN BERING SEA FISHERIES CONSERVATION AND MANAGEMENT SO OCEAN DEVELOPMENT AND INTERNATIONAL LAW LA English DT Review ID INTERNATIONAL-LAW; OCEAN FISHERIES; NORTH PACIFIC; USSR AB The pace of developments in national and international policies for the conservation and management of the living marine resources of the Bering Sea has accelerated dramatically, while key stocks have evidenced severe population declines. These developments stem from overcapitalization of the U.S. domestic fishery and overexploitation of straddling stocks within the central Bering Sea high seas ''donut hole. '' In waters under U.S. jurisdiction, a unique limited entry management system is being readied for the sablefish and halibut fisheries. At the same time, internal changes in Russia have created the preconditions for a convergence of interests with the United States regarding maritime regimes and coordination mechanisms for the region. That convergence was manifested in a joint effort to negotiate a voluntary suspension of pollock fishing in the central Bering Sea with noncoastal fishing states. As a result, the distant water fishing fleets of Japan, China, South Korea, and Poland have departed the sea and a multilateral convention is being drafted for management of this stock While the noncoastal states emphasize that the suspension is temporary, several aspects of the negotiation process could affect the evolving law of the sea and set a precedent for regimes in other areas with high seas pockets. The doctrine of semi-enclosed seas in particular will likely be subjected to increased interest and scrutiny. In addition, fisheries policy making in the United States will be increasingly complicated by the nexus of local, interstate, and international interests and associated commercial or trade issues. RP CANFIELD, JL (reprint author), USN,COLL WAR,NEWPORT,RI 02841, USA. NR 108 TC 5 Z9 5 U1 1 U2 3 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0090-8320 J9 OCEAN DEV INT LAW JI Ocean Dev. Int. Law PD JUL-SEP PY 1993 VL 24 IS 3 BP 257 EP 289 PG 33 WC International Relations; Law SC International Relations; Government & Law GA LY203 UT WOS:A1993LY20300002 ER PT J AU WU, C AF WU, C TI SPECIFIC POWER ANALYSIS OF THERMOELECTRIC OTEC PLANTS SO OCEAN ENGINEERING LA English DT Note ID HEAT ENGINES AB The specific power output of a real thermoelectric OTEC plant is analyzed and optimized. The thermoelectric OTEC is treated as an external and internal irreversible heat engine. The irreversibilities of the heat engine are limited to the factors of heat transfers and Joulean loss only. The specific power output of the real thermoelectric OTEC is then compared with that of the Carnot OTEC, endoreversible OTEC and external reversible thermoelectric OTEC. RP WU, C (reprint author), USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402, USA. NR 6 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 0029-8018 J9 OCEAN ENG JI Ocean Eng. PD JUL PY 1993 VL 20 IS 4 BP 433 EP 442 DI 10.1016/0029-8018(93)90006-4 PG 10 WC Engineering, Marine; Engineering, Civil; Engineering, Ocean; Oceanography SC Engineering; Oceanography GA KU957 UT WOS:A1993KU95700006 ER PT J AU HUSTON, AL EVERSOLE, JD AF HUSTON, AL EVERSOLE, JD TI STRAIN-SENSITIVE ELASTIC-SCATTERING FROM CYLINDERS SO OPTICS LETTERS LA English DT Article ID WHISPERING-GALLERY MODES; EMISSION AB Morphology-dependent resonance features are observed in the elastic-scattering spectra of 125-mum-diameter cylinders (optical fibers) as a function of wavelength. The positions of the resonances are strain sensitive and can be tuned in a controlled manner by the application of strain with a piezoelectric transducer. The measured wavelength shifts yield a linear slope of 0.14 nm/mstrain, in good agreement with calculated shifts based on published data for the elastic moduli and the strain-optic coefficients for fused quartz. This demonstrates a new miniature optical strain-sensor technique capable of microstrain sensitivity at a single point. RP HUSTON, AL (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5611,WASHINGTON,DC 20375, USA. NR 12 TC 20 Z9 20 U1 0 U2 4 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD JUL 1 PY 1993 VL 18 IS 13 BP 1104 EP 1106 DI 10.1364/OL.18.001104 PG 3 WC Optics SC Optics GA LJ227 UT WOS:A1993LJ22700024 PM 19823304 ER PT J AU FOX, AG AF FOX, AG TI IS IT FEASIBLE TO DETERMINE THE BONDING CHARGE-DENSITY OF STOICHIOMETRIC GAMMA-TIAL THROUGH STRUCTURE FACTOR MEASUREMENTS SO PHILOSOPHICAL MAGAZINE LETTERS LA English DT Article ID ATOMIC SCATTERING FACTORS; X-RAY-DIFFRACTION; VOLTAGE ELECTRON-DIFFRACTION; DIFFRACTOMETRY; CRYSTALS; ALLOYS; COPPER; METAL; GAAS AB All the experimental methods for the measurement of structure factors are reviewed with emphasis on determining the electron charge-density distributions of intermetallic alloys, in particular gamma-TiAl. The techniques discussed include X-ray diffraction, X-ray pendellosung methods, gamma-ray diffraction and high-energy electron diffraction (intersecting Kikuchi line, critical voltage and convergent-beam rocking-curve procedures). All these methods (except for electron diffraction) require high-quality single crystals which seem impossible to prepare for equiatomic gamma-TiAl. However, the critical-voltage electron diffraction measurements presented in this work indicate that the 001, 110, 111, 200, 002, 220 and 202 structure factor amplitudes of stoichiometric gamma-TiAl can be determined with sufficient accuracy for a charge-density study provided that great care is taken. RP FOX, AG (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MAT SCI SECT,MONTEREY,CA 93943, USA. NR 45 TC 23 Z9 23 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0950-0839 J9 PHIL MAG LETT JI Philos. Mag. Lett. PD JUL PY 1993 VL 68 IS 1 BP 29 EP 37 DI 10.1080/09500839308242273 PG 9 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA LM484 UT WOS:A1993LM48400005 ER PT J AU SINGH, DJ AF SINGH, DJ TI ELECTRONIC-STRUCTURE OF HGBA2CUO4 SO PHYSICA C LA English DT Article ID FIELD GRADIENTS; BRILLOUIN-ZONE; SPECIAL POINTS; SUPERCONDUCTORS; YBA2CU3O7-X; POSITRON AB Local density approximation calculations of the electronic structure of HgBa2CuO4 are reported along with a number of properties identifiable from it. For the stoichiometric material, the only band crossing the Fermi energy is the Cu-O derived antibonding state characteristic of high-T(c) cuprates; this band is half-filled. Thus, the stoichiometric material is expected to be a Mott insulator, as are the other undoped cuprates, and the excess oxygen reported in the as-synthesized material is no doubt essential for its superconductivity. Electric field gradients are calculated and compared with those in other cuprates. The positron wave-function has maximum weight in the rather large holes in the Hg layer. However, unlike the majority of high-T(c) materials. there is substantial weight throughout the unit cell, including the Cu-O layer region. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 25 TC 47 Z9 47 U1 1 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 JUL 1 PY 1993 VL 212 IS 1-2 BP 228 EP 232 DI 10.1016/0921-4534(93)90508-N PG 5 WC Physics, Applied SC Physics GA LL339 UT WOS:A1993LL33900031 ER PT J AU CHEN, CT IDZERDA, YU LIN, HJ MEIGS, G CHAIKEN, A PRINZ, GA HO, GH AF CHEN, CT IDZERDA, YU LIN, HJ MEIGS, G CHAIKEN, A PRINZ, GA HO, GH TI ELEMENT-SPECIFIC MAGNETIC HYSTERESIS AS A MEANS FOR STUDYING HETEROMAGNETIC MULTILAYERS SO PHYSICAL REVIEW B LA English DT Note ID CIRCULAR-DICHROISM; MAGNETORESISTANCE; SUPERLATTICES; TRANSITION; EXCHANGE; NICKEL; EDGES; IRON; CR AB We report element-specific magnetic hysteresis measurements on heteromagnetic materials. Dramatically different Fe and Co hysteresis curves of Fe/Cu/Co trilayers were obtained by recording the magnetic circular dichroism at their respective L3 white lines as a function of applied magnetic field. The data resolve the complicated hysteresis curves, observed by conventional magnetometry, and determine the individual magnetic moments for the Fe and Co layers. Fine hysteresis features, imperceptible in the conventional curves, were also observed, demonstrating a new and powerful means for studying heteromagnetic multilayer systems. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. RP CHEN, CT (reprint author), AT&T BELL LABS,600 MT AVE,MURRAY HILL,NJ 07974, USA. NR 24 TC 105 Z9 107 U1 0 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 JUL 1 PY 1993 VL 48 IS 1 BP 642 EP 645 DI 10.1103/PhysRevB.48.642 PG 4 WC Physics, Condensed Matter SC Physics GA LL907 UT WOS:A1993LL90700089 ER PT J AU SPRUNT, S NOUNESIS, G LITSTER, JD RATNA, B SHASHIDHAR, R AF SPRUNT, S NOUNESIS, G LITSTER, JD RATNA, B SHASHIDHAR, R TI HIGH-FIELD MAGNETIC BIREFRINGENCE STUDY OF THE PHASE-BEHAVIOR OF CONCENTRATED-SOLUTIONS OF PHOSPHOLIPID TUBULES SO PHYSICAL REVIEW E LA English DT Article ID CHIRAL LIPID BILAYERS; MICROSTRUCTURES; ORIENTATION; MEMBRANES AB High-resolution, high-field magnetic birefringence has been used to study the behavior of single-bilayer phospholipid tubules in concentrated solutions and in the vicinity of the lipid chain-melting temperature T(m). Results are presented for five different initial lipid densities, rho=0.5, 1.0, 2.0, 4.0, and 6.0 mg/cm3-which yield tubule concentrations in the range v=10(9)-10(10) cm-3-at fields to 15 T. On approach to T(m) from room temperature, the maximum induced refractive-index anisotropy DELTAn(max) evolves with concentration from a smoothly decreasing to a sharply discontinous function; a sample with concentration corresponding to rho=4.0 mg/cm3 shows evidence of a nearly critical phase transition. Above T(m) the system appears isotropic (there is no induced anisotropy), although measurements of the optical transmission I(T) indicate that at T approximately T(m) and for rho almost-equal-to 4.0 mg/cm3, the structure of the isotropic phase changes significantly. For T sufficiently above T(m), however, the isotropic phase has the same properties for all rho. The significance of these results is discussed qualitatively in terms of models proposed for tubule formation and phase behavior. Data are also presented for cooling samples in a high field from T > T(m). Finally, preliminary measurements indicate that the magnetic susceptibility anisotropy DELTA(chi) in the lower concentration samples has a different temperature dependence than the induced refractive-index anisotropy for T < T(m). C1 GEORGETOWN UNIV,MED CTR,DEPT BIOCHEM,WASHINGTON,DC 20007. USN,RES LAB,WASHINGTON,DC 20375. RP SPRUNT, S (reprint author), MIT,FRANCIS BITTER NATL MAGNET LAB,CAMBRIDGE,MA 02139, USA. NR 40 TC 6 Z9 6 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUL PY 1993 VL 48 IS 1 BP 328 EP 339 DI 10.1103/PhysRevE.48.328 PG 12 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LN697 UT WOS:A1993LN69700043 ER PT J AU RENDELL, RW AF RENDELL, RW TI INTERACTION OF A RELAXING SYSTEM WITH A DYNAMICAL ENVIRONMENT SO PHYSICAL REVIEW E LA English DT Note ID SEMI-CLASSICAL QUANTIZATION; BULK AMORPHOUS POLYMERS; LIQUID-GLASS-TRANSITION; LOCAL CHAIN MOTION; MOLECULAR-DYNAMICS; MODEL; RELAXATION; SIMULATIONS; PREDICTIONS; DIFFUSION AB It is shown that nonlinear interactions with a dynamical environment are able to transform the microscopic trajectories of a relaxing system to evolve as a time-dependent multiplicative process. When averaged over an ensemble of such trajectories, a nonexponential response with a scaled relaxation time is generated. Similar features have been observed for dispersive transport and relaxation in experiments and simulations of interacting constituents in condensed matter. This new class of statistical-mechanical systems is illustrated using a Hamiltonian-driven damped Fermi accelerator and an asymmetrically damped stadium billiard. RP RENDELL, RW (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 28 TC 25 Z9 25 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUL PY 1993 VL 48 IS 1 BP R17 EP R20 DI 10.1103/PhysRevE.48.R17 PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LN697 UT WOS:A1993LN69700005 ER PT J AU KAPETANAKOS, CA LEN, LK SMITH, T MARSH, SJ LOSCHIALPO, P DIALETIS, D MATHEW, J AF KAPETANAKOS, CA LEN, LK SMITH, T MARSH, SJ LOSCHIALPO, P DIALETIS, D MATHEW, J TI THE NAVAL RESEARCH LABORATORY MODIFIED BETATRON ACCELERATOR AND ASSESSMENT OF ITS RESULTS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID BEAM; FIELDS; RING AB In this paper the experimental results of the Naval Research Laboratory (NRL) Modified Betatron Accelerator (MBA) [Phys. Rev. Lett. 64, 2374 (1990)] are briefly summarized and assessed. These results show that the addition of the strong focusing (SF) field made a substantial improvement in the confining properties of the device, at least in the intermediate time scale, and that the SF field together with the finite resistivity of the vacuum chamber wall is responsible for the trapping of the beam. There is extensive experimental evidence, suggesting that the slow beam loss during acceleration is caused by the cyclotron resonances. Reduction of several field errors together with operation at higher toroidal and SF field led to beam energies in excess of 20 MeV, while the trapped current was above 1 kA. Preliminary beam extraction experiments with 12 resonant coils have shown that a approximately 80 G field disturbance is required to extract the beam from the MBA. C1 SFA INC,LANDOVER,MD 20785. USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375. FM TECHNOL INC,FAIRFAX,VA 22032. SCI APPLICAT INT CORP,MCLEAN,VA 22102. NR 42 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 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2295 EP 2313 DI 10.1063/1.860764 PN 1 PG 19 WC Physics, Fluids & Plasmas SC Physics GA LL899 UT WOS:A1993LL89900040 ER PT J AU FREUND, HP JACKSON, RH PERSHING, DE AF FREUND, HP JACKSON, RH PERSHING, DE TI THE NONLINEAR-ANALYSIS OF SELF-FIELD EFFECTS IN FREE-ELECTRON LASERS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID GUIDE MAGNETIC-FIELD; AMPLIFIER; RAMAN; MILLIMETER AB A model of the self-fields associated with the charge density and current of the electron beam is incorporated into three-dimensional nonlinear formulations of the interaction in free-electron lasers for both planar and helical wiggler configurations. The model assumes the existence of a cylindrically symmetric electron beam with a flat-top density profile and a uniform axial velocity, and the self-electric and self-magnetic fields are determined from Poisson's equation and Ampere's law. Diamagnetic and paramagnetic effects due the electron beam interaction with the wiggler field are neglected; bence, the model breaks down when the wiggler-induced transverse displacement is comparable to the beam radius. The nonlinear formulations are based upon the ARACHNE and WIGGLIN codes, which represent slow-time-scale formulations for the evolution of the amplitudes and phases of a multimode superposition of vacuum waveguide modes. The electron dynamics in these codes are treated by means of the complete three-dimensional Lorentz force equations, and the representations for the self-fields are incorporated directly into this formulation. The results of the simulations are compared directly with an experiment at Lawrence Livermore National Laboratory based upon a planar wiggler and experiments at the Massachusetts Institute of Technology and the Naval Research Laboratory, which employed helical wigglers. These experiments employed intense electron beams with current densities of 200-1200 A/cm2 and comparable space-charge depressions of DELTAgamma(self)/gamma0 almost-equal-to 0.53%-0.78% across the beam. The simulations are in reasonable agreement with the experiments, and indicate that the self-fields tend to (1) reduce saturation efficiencies and (2) enhance beam spreading depending upon the magnitude of external beam focusing. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. MISSION RES CORP,NEWINGTON,VA 22122. RP FREUND, HP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 24 TC 43 Z9 43 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2318 EP 2330 DI 10.1063/1.860766 PN 1 PG 13 WC Physics, Fluids & Plasmas SC Physics GA LL899 UT WOS:A1993LL89900042 ER PT J AU CHEN, J AF CHEN, J TI PHYSICS OF THE MAGNETOTAIL CURRENT SHEET SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID CHARGED-PARTICLE MOTION; PLASMA SHEET; GEOMAGNETIC TAIL; COLLISIONLESS CONDUCTIVITY; DIFFERENTIAL MEMORY; MAGNETIC NULL; DYNAMICS; ORBITS; FIELD; ION AB The Earth's magnetotail plays an important role in the solar-wind-magnetosphere coupling. At the midplane of the magnetotail is a current sheet where the dominant magnetic field component reverses sign. The charged particle motion in and near the current sheet is collisionless and nonintegrable, exhibiting chaotic scattering. The current understanding of the dynamical properties of the charged particle motion is discussed. In particular. the relationships between particle dynamics and global attributes of the system are elucidated. Geometrical properties of the phase space determine important physical observables on both micro- and macroscales. RP CHEN, J (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 45 TC 10 Z9 10 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2663 EP 2670 DI 10.1063/1.860704 PN 2 PG 8 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000044 ER PT J AU FLIFLET, AW FISCHER, RP MANHEIMER, WM AF FLIFLET, AW FISCHER, RP MANHEIMER, WM TI NEW RESULTS AND APPLICATIONS FOR THE QUASI-OPTICAL GYROTRON SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID QUASI-OPTICAL GYROTRON; FREE-ELECTRON LASER; VARIABLE MIRROR SEPARATION; HIGH-POWER; WAVE; OPERATION; WIGGLERS; MASER; CW AB The quasioptical gyrotron (QOG), which features an open resonator formed by a pair of spherical mirrors instead of the conventional gyrotron waveguide cavity, has been under development at the U. S. Naval Research Laboratory as a tunable high power millimeter-wave source for tokamak plasma heating, advanced radars, and power beaming. Results have recently been obtained for a quasioptical gyroklystron (QOGK) realized by the addition of an open-mirror prebunching resonator driven by an 85 GHz, 1.5 kW extended interaction oscillator. Efficiency enhancement by mode priming has been investigated, and efficiencies up to 19% have been obtained by increasing the frequency detuning of the operating mode. An overall efficiency of 30% was obtained by the addition of a simple depressed collector. Phase-locked operation was demonstrated at a power of 57 kW and efficiency of 16%. The high circulating power in the QOG resonator is currently being considered for use as an electromagnetic wiggler for compact infrared free-electron lasers. The QOG is also promising as a source for an active sensor of upper atmosphere trace impurities. RP FLIFLET, AW (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 36 TC 13 Z9 13 U1 2 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2682 EP 2689 DI 10.1063/1.860706 PN 2 PG 8 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000047 ER PT J AU ESAREY, E SPRANGLE, P KRALL, J TING, A JOYCE, G AF ESAREY, E SPRANGLE, P KRALL, J TING, A JOYCE, G TI OPTICALLY GUIDED LASER WAKE-FIELD ACCELERATION SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID BEAT-WAVE ACCELERATOR; ELECTROMAGNETIC-WAVES; PLASMAS; PULSES; GENERATION AB The laser wake-field acceleration concept is studied using a general axisymmetric formulation based on relativistic fluid equations. This formalism is valid for arbitrary laser intensities and allows the laser-plasma interaction to be simulated over long propagation distances (many Rayleigh lengths). Several methods for optically guiding the laser pulse are examined, including relativistic guiding, preformed plasma density channels and tailored pulse profiles. Self-modulation of the laser, which occurs when the pulse length is long compared to the plasma wavelength and the power exceeds the critical power, is also examined. Simulations of three possible laser wake-field accelerator (LWFA) configurations are performed and discussed: (i) a channel-guided LWFA, (ii) a tailored-pulse LWFA, and (iii) a self-modulated LWFA. RP ESAREY, E (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 51 TC 109 Z9 109 U1 2 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1993 VL 5 IS 7 BP 2690 EP 2697 DI 10.1063/1.860707 PN 2 PG 8 WC Physics, Fluids & Plasmas SC Physics GA LL900 UT WOS:A1993LL90000048 ER PT J AU COLE, DA MAXWELL, SE ARVEY, R SALAS, E AF COLE, DA MAXWELL, SE ARVEY, R SALAS, E TI MULTIVARIATE GROUP COMPARISONS OF VARIABLE SYSTEMS - MANOVA AND STRUCTURAL EQUATION MODELING SO PSYCHOLOGICAL BULLETIN LA English DT Article ID DISCRIMINANT-ANALYSIS; LATENT-VARIABLES; POPULATIONS; COVARIANCE; INVARIANCE; UNIVARIATE AB Multivariate analysis of variance (MANOVA) and structural equation modeling (SEM) are compared as alternative approaches to the detection of multivariate mean differences in between-groups designs. MANOVA remains the most commonly implemented multivariate test of between-groups mean differences. When the set of outcome variables reflects a latent-variable system rather than an emergent-variable system, however, SEM provides an elegant alternative to MANOVA. Three generic types of latent-variable systems were considered. In the simplest case, SEM and MANOVA led to very similar substantive interpretations. In the 2 more complex variable systems, SEM provided parameter estimates and collateral information that was at least as informative as those provided by MANOVA. Researchers are encouraged to consider more carefully the nature of their variable systems before choosing too casually MANOVA over SEM. C1 UNIV MINNESOTA,CTR IND RELAT,MINNEAPOLIS,MN 55455. USN,CTR TRAINING SYST,ORLANDO,FL. RP COLE, DA (reprint author), UNIV NOTRE DAME,DEPT PSYCHOL,NOTRE DAME,IN 46556, USA. RI Rohlf, F/A-8710-2008 NR 36 TC 48 Z9 50 U1 2 U2 10 PU AMER PSYCHOLOGICAL ASSOC PI WASHINGTON PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 SN 0033-2909 J9 PSYCHOL BULL JI Psychol. Bull. PD JUL PY 1993 VL 114 IS 1 BP 174 EP 184 PG 11 WC Psychology; Psychology, Multidisciplinary SC Psychology GA LL161 UT WOS:A1993LL16100010 ER PT J AU BERNHARDT, PA HUBA, JD CHATURVEDI, PK FULFORD, JA FORSYTH, PA ANDERSON, DN ZALESAK, ST AF BERNHARDT, PA HUBA, JD CHATURVEDI, PK FULFORD, JA FORSYTH, PA ANDERSON, DN ZALESAK, ST TI ANALYSIS OF ROCKET BEACON TRANSMISSIONS FOR COMPUTERIZED RECONSTRUCTION OF IONOSPHERIC DENSITIES SO RADIO SCIENCE LA English DT Article ID EQUATORIAL SPREAD-F; TRANSEQUATORIAL BUBBLES; TOMOGRAPHIC INVERSION; SATELLITE PHOTOMETRY; PLASMA DEPLETIONS; EMISSION RATES AB Three methods are described to obtain ionospheric electron densities from transionospheric. rocket-beacon total electron content (TEC) data. First, when the line-of-sight from a ground receiver to the rocket beacon is tangent to the flight trajectory, the electron concentration can be obtained by differentiating the TEC with respect to the distance to the rocket. A similar method may be used to obtain the electron-density profile if the layer is horizontally stratified. Second, TEC data obtained during chemical release experiments may be interpreted with the aid of physical models of the disturbed ionosphere to yield spatial maps of the modified regions. Third, computerized tomography (CT) can be used to analyze TEC data obtained along a chain of ground-based receivers aligned along the plane of the rocket trajectory. CT analysis of TEC data is used to reconstruct a two-dimensional image of a simulated equatorial plume. TEC data is computed for a linear chain of nine receivers with adjacent spacings of either 100 or 200 km. The simulation data are analyzed to provide an F region reconstruction on a grid with 15 x 15 km pixels. Ionospheric rocket tomography may also be applied to rocket-assisted measurements of amplitude and phase scintillations and airglow intensities. C1 UNIV WESTERN ONTARIO,CTR RADIO SCI,LONDON N6A 3K7,ONTARIO,CANADA. USAF,PHILLIPS LAB,DIV IONOSPHER EFFECTS,BEDFORD,MA 01731. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RP BERNHARDT, PA (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,WASHINGTON,DC 20375, USA. NR 43 TC 14 Z9 14 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0048-6604 J9 RADIO SCI JI Radio Sci. PD JUL-AUG PY 1993 VL 28 IS 4 BP 613 EP 627 DI 10.1029/93RS00383 PG 15 WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications GA LR260 UT WOS:A1993LR26000016 ER PT J AU WARK, JS WHITLOCK, RR AF WARK, JS WHITLOCK, RR TI EFFECT OF HIGH X-RAY FLUXES ON LASER-PLASMA X-RAY SPECTROMETERS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB LiF (200) crystals were heated with the x rays produced when a 30 J, 0.35 mum laser pulse of 0.6 ns duration was incident 6n a gold-coated titanium target at an irradiance of 2.5 X 10(15) W cm-2. A filter arrangement allowed half of the crystal to be heated by the broad band x radiation from the gold plasma, whilst effectively shielding the other half of the crystal. The reflectivity of both x-ray heated and unheated portions of the crystal was monitored by diffracting He-alpha radiation from the underlying titanium from both parts of the crystal. Significant increases in the integrated reflectivity (36%) of the heated crystal were found. C1 USN,RES LAB,WASHINGTON,DC 20375. RP WARK, JS (reprint author), UNIV OXFORD,DEPT PHYS,CLARENDON LAB,PARKS RD,OXFORD OX1 3PU,ENGLAND. NR 7 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUL PY 1993 VL 64 IS 7 BP 1718 EP 1722 DI 10.1063/1.1143999 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA LN411 UT WOS:A1993LN41100005 ER PT J AU FRANCAVILLA, TL SOULEN, RJ CLAASSEN, JH AF FRANCAVILLA, TL SOULEN, RJ CLAASSEN, JH TI SIMPLE APPARATUS FOR THE LIQUEFACTION OF NEON DIRECTLY INTO A RESEARCH DEWAR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB A simple apparatus for liquefying neon is described for use in experiments that require a stable thermal environment at 27 K. This apparatus makes use of a closed-cycle refrigerator attached to an insulated cold finger inserted into a conventional stainless steel Dewar to liquefy a quantity of neon gas stored previously in a tank. The system is inexpensive and easy to use. Furthermore, the neon is recovered for subsequent reuse upon completion of the experiment. Starting with a Dewar holding a small coil that had not been precooled, and using a refrigerator with rated cooling capacity of 15 W at 26 K, approximately 0.5 l of liquid neon was condensed into the Dewar in approximately 4 h. The apparatus has been used to measure the critical currents of high T(c) oxide tape coils both with and without the application of an external magnetic field. RP FRANCAVILLA, TL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 4 TC 7 Z9 7 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUL PY 1993 VL 64 IS 7 BP 2023 EP 2026 DI 10.1063/1.1143993 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA LN411 UT WOS:A1993LN41100055 ER PT J AU MILLER, JB AF MILLER, JB TI XE-129 NMR IN POLYMERS SO RUBBER CHEMISTRY AND TECHNOLOGY LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; STATISTICAL MECHANICAL MODEL; SOLID POLYMERS; SIMPLE PENETRANTS; AMORPHOUS STATE; XENON; DIFFUSION; PROBE; DYNAMICS; SHIFTS RP MILLER, JB (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 30 TC 12 Z9 12 U1 1 U2 2 PU AMER CHEMICAL SOC INC PI AKRON PA RUBBER DIV UNIV AKRON PO BOX 499, AKRON, OH 44309-0499 SN 0035-9475 J9 RUBBER CHEM TECHNOL JI Rubber Chem. Technol. PD JUL-AUG PY 1993 VL 66 IS 3 BP 455 EP 461 DI 10.5254/1.3538320 PG 7 WC Polymer Science SC Polymer Science GA LT653 UT WOS:A1993LT65300007 ER PT J AU WIENHOLD, PD EBY, RK LIU, JM AF WIENHOLD, PD EBY, RK LIU, JM TI EFFECT OF FIBER NONLINEAR ELASTICITY ON THE TEMPERATURE AND STRESS DEPENDENCE OF YOUNGS MODULUS OF CONTINUOUS FIBER COMPOSITES SO SAMPE QUARTERLY-SOCIETY FOR THE ADVANCEMENT OF MATERIAL AND PROCESS ENGINEERING LA English DT Article AB The effect of the nonlinear elasticity of carbon fibers on the axial Young's modulus of a uniaxial composite is reported. Previous work on a metal matrix composite yielded an equation to predict the axial Young's modulus and its change with temperature. The equation takes into account the thermal strains generated in the fiber and the matrix by the mismatch of thermal expansion, the nonlinear elasticity of the constituents, and the normal effects of temperature and applied stress. Nonlinear elasticity data for pitch-based, carbon fibers are used together with data for an aluminum matrix and the predictive equation to calculate Young's modulus. The results are compared with experimental data and the simpler Rule-of-Mixtures(ROM) predictions which neglect the effects of thermally generated strains coupled with nonlinear elasticity. The results display fairly close agreement with measured values of composite modulus, but large differences from the simpler ROM predictions. Although the validity of the predictive equation has not been fully verified, the variation of composite modulus with temperature and applied stress which it predicts is quite significant. Under certain conditions, a composite can be designed with a modulus that is independent of temperature or applied stress. C1 UNIV AKRON,AKRON,OH 44325. USN,CTR SURFACE WARFARE,WHITE OAK DETACHMENT DAHLGREN DIV,SILVER SPRING,MD 20910. RP WIENHOLD, PD (reprint author), JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20707, USA. NR 18 TC 0 Z9 0 U1 1 U2 3 PU SAMPE PUBLISHERS PI COVINA PA 1161 PARKVIEW DRIVE, COVINA, CA 91722 SN 0036-0821 J9 SAMPE QUART PD JUL PY 1993 VL 24 IS 4 BP 35 EP 39 PG 5 WC Engineering, Multidisciplinary; Materials Science, Multidisciplinary SC Engineering; Materials Science GA LQ558 UT WOS:A1993LQ55800005 ER PT J AU GOLDMAN, G WELBOURN, R KLAUSNER, JM KOBZIK, L VALERI, CR SHEPRO, D HECHTMAN, HB AF GOLDMAN, G WELBOURN, R KLAUSNER, JM KOBZIK, L VALERI, CR SHEPRO, D HECHTMAN, HB TI LEUKOCYTES MEDIATE ACID ASPIRATION INDUCED MULTIORGAN EDEMA SO SURGERY LA English DT Article ID RESPIRATORY-DISTRESS SYNDROME; LUNG INJURY; HEMORRHAGIC-SHOCK; ORGAN INJURY; NEUTROPHILS; PULMONARY; MYELOPEROXIDASE; GLYCOPROTEIN; INFLAMMATION; STIMULATION AB Acid aspiration leads to lung injury characterized by polymorphonuclear neutrophil leukocytes (PMN) sequestration and edema. This study investigates whether localized acid aspiration leads to activation of circulating PMN and triggers both local and remote PMN sequestration and whether these cells are responsible for increase in pulmonary permeability and systemic organ edema. Methods. Rats pretreated with intravenous saline solution or rendered neutropenic (nitrogen mustard or antineutrophil serum) underwent tracheostomy and insertion of a cannula into a lung segment. This was followed by instillation of either 0.1 N HCl or saltine solution. Results. After 30 minutes leukopenia was noted (2650 white blood cells/mm3) in saline-treated, acid-lavaged rats, and circulating PMN produced H2O2 (20 femtomole dichlorofluorescein/PMN compared with 3 femtomole in control animals (both, p < 0.05). PMN were progressively sequestered in the nonaspirated lung, the heart, and kidney. Permeability and edema developed in the lungs and systemic organs. In neutropenic rats there was a reduction of aspiration-induced thromboxane B2 and leukotriene B4 synthesis (p < 0.05), decrease in lung wet to dry weight and protein level in bronchoalveolar lavage of the aspirated and nonaspirated lungs, and reduction in myeloperoxidase activity in the heart and kidney and in wet to dry weight of these organs (all, p < 0.05). Conclusions. These data indicate that localized acid aspiration activates circulating neutrophils and promotes their sequestration in the lungs and systemic organs. These cells are largely responsible for the multisystem organ edema. C1 HARVARD UNIV,BRIGHAM & WOMENS HOSP,SCH MED,DEPT SURG,75 FRANCIS ST,BOSTON,MA 02115. HARVARD UNIV,BRIGHAM & WOMENS HOSP,SCH MED,DEPT PATHOL,BOSTON,MA 02115. BOSTON UNIV,CTR BIOL SCI,BOSTON,MA 02215. USN,BLOOD RES LAB,BOSTON,MA. FU NHLBI NIH HHS [HL16714-14]; NIGMS NIH HHS [GM24891-12, GM35141-05] NR 32 TC 35 Z9 36 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0039-6060 J9 SURGERY JI Surgery PD JUL PY 1993 VL 114 IS 1 BP 13 EP 20 PG 8 WC Surgery SC Surgery GA LK905 UT WOS:A1993LK90500004 PM 8395089 ER PT J AU ANDERSON, WT CHRISTIANSON, KA MOGLESTUE, C AF ANDERSON, WT CHRISTIANSON, KA MOGLESTUE, C TI THEORETICAL AND EXPERIMENTAL-STUDY OF FAILURE MECHANISMS IN RF RELIABILITY LIFE TESTED HIGH-ELECTRON-MOBILITY TRANSISTORS SO MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY LA English DT Article; Proceedings Paper CT 1ST WORKSHOP ON EXPERT EVALUATION AND CONTROL OF COMPOUND SEMICONDUCTOR MATERIALS AND TECHNOLOGIES : SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY ( EXMATEC 92 ) CY MAY 19-22, 1992 CL ECULLY, FRANCE SP CNRS, CTR NATL ETUDES TELECOMMUN, COMMISS EUROPEAN COMMUNITIES, ECOLE CENT LYON, USA, EUROPEAN RES OFF, MINIST DEF, DIRECT RECH ETUDES & TECH, USN, OFF NAVAL RES, EUROPEAN OFF, SOC ELECTRICIENS & ELECTRONICIENS ID MESFETS AB An experimental and theoretical study was carried out to investigate the failure mechanisms in r.f. life tested high electron mobility transistors (HEMTs). Monte Carlo simulations confirmed the experimental conclusions that degradation in the gain, noise figure, transconductance, and other characteristics resulted from gate metal interdiffusion and ohmic contact degradation. C1 FRAUNHOFER INST APPL SOLID STATE PHYS,W-7800 FREIBURG,GERMANY. RP ANDERSON, WT (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 5 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 0921-5107 J9 MAT SCI ENG B-SOLID JI Mater. Sci. Eng. B-Solid State Mater. Adv. Technol. PD JUN 30 PY 1993 VL 20 IS 1-2 BP 26 EP 28 DI 10.1016/0921-5107(93)90389-5 PG 3 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA LQ495 UT WOS:A1993LQ49500005 ER PT J AU TSAI, TE JEWELL, JM SANGHERA, JS AF TSAI, TE JEWELL, JM SANGHERA, JS TI DYNAMICS OF THE 5-EV OPTICAL-ABSORPTION IN SIO2 GLASS SO APPLIED PHYSICS LETTERS LA English DT Article ID SYNTHETIC SILICA GLASS; DEFECTS; OXYGEN; MECHANISM; BANDS AB The optical absorption at 5 eV in SiO2 glass was observed, using laser calorimetry, to change reversibly depending on the intensity of UV light. The generation and bleaching of an absorption band at 5 eV by two- and one-photon absorption processes, respectively, can explain these reversible changes. This observation supports the structural model of unrelaxed oxygen deficiency center for the 5 eV absorption band in silica. C1 VIRGINIA POLYTECH INST & STATE UNIV,BLACKSBURG,VA 24061. RP TSAI, TE (reprint author), USN,RES LAB,CODE 5605,WASHINGTON,DC 20375, USA. NR 25 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 28 PY 1993 VL 62 IS 26 BP 3396 EP 3398 DI 10.1063/1.109028 PG 3 WC Physics, Applied SC Physics GA LJ888 UT WOS:A1993LJ88800002 ER PT J AU BACH, SBH MCELVANY, SW WONG, NM PARENT, DC AF BACH, SBH MCELVANY, SW WONG, NM PARENT, DC TI PRODUCTION OF ALUMINUM CLUSTERS BY DIRECT LASER VAPORIZATION OF ALUMINUM NITRIDE SO CHEMICAL PHYSICS LETTERS LA English DT Article ID COLLISION-INDUCED DISSOCIATION; RESONANCE MASS-SPECTROMETRY; METAL-CLUSTERS; ACTIVATION BARRIERS; CHEMICAL-REACTIONS; IONS; CHEMISORPTION; AMMONIA; OXYGEN; CHEMISTRY AB We report the production of aluminum clusters (Al(x)+, x up to 62 and Al(x)-, x up to 42) in a FTMS by direct laser vaporization of aluminum nitride. This is the first observation of pure metal clusters from a metal compound. A pressure burst composed of N and/or N2 accompanies cluster formation and presumably helps stabilize the nascent clusters. The cluster intensity distributions are similar to those obtained using aluminum targets. The thermalized cation clusters do not react with O2, unless they are kinetically excited. Deviations in the branching ratios from earlier beam investigations may result from pressure/timescale differences in the two experiments. C1 USN,RES LAB,DIV CHEM,CODE 6113,WASHINGTON,DC 20375. RI Bach, Stephan/B-7496-2009 NR 27 TC 14 Z9 14 U1 0 U2 7 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 JUN 25 PY 1993 VL 209 IS 1-2 BP 57 EP 62 DI 10.1016/0009-2614(93)87201-D PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LH246 UT WOS:A1993LH24600010 ER PT J AU HARRISON, JA WHITE, CT COLTON, RJ BRENNER, DW AF HARRISON, JA WHITE, CT COLTON, RJ BRENNER, DW TI EFFECTS OF CHEMICALLY-BOUND, FLEXIBLE HYDROCARBON SPECIES ON THE FRICTIONAL-PROPERTIES OF DIAMOND SURFACES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID ATOMIC-SCALE FRICTION; MOLECULAR-DYNAMICS SIMULATIONS; LANGMUIR-BLODGETT-FILMS; VAPOR-DEPOSITION; FORCE MICROSCOPY; MUSCOVITE MICA; TUNGSTEN TIP; ANISOTROPY; MOTION; SLIP AB We have used molecular dynamics simulations to examine friction when two diamond (111) surfaces are placed in sliding contact. We find that flexible hydrocarbon species, chemically bound to the diamond surface, can lead to a significant reduction of the calculated friction at high loads. In addition to clarifying the effects of such species on atomic-scale friction at diamond interfaces, these simulations might also yield insight into more complicated systems, e.g., Langmuir-Blodgett films, and aid in the design of low-friction coatings. RP USN, RES LAB, DIV CHEM, CODE 6179, WASHINGTON, DC 20375 USA. RI Brenner, Donald/D-1741-2009 NR 37 TC 76 Z9 78 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 24 PY 1993 VL 97 IS 25 BP 6573 EP 6576 DI 10.1021/j100127a001 PG 4 WC Chemistry, Physical SC Chemistry GA LV439 UT WOS:A1993LV43900001 ER PT J AU PROKES, SM AF PROKES, SM TI LIGHT-EMISSION IN THERMALLY OXIDIZED POROUS SILICON - EVIDENCE FOR OXIDE-RELATED LUMINESCENCE SO APPLIED PHYSICS LETTERS LA English DT Article AB The luminescence behavior of thermally oxidized porous silicon has been examined at various temperatures and times. No blue shifting of the photoluminescence has been noted with extended oxidation time (3-120 min), in a range where a 30% oxide thickness increase has been reported. This result does not easily fit the quantum confinement model, since the luminescence does not appear to depend on particle sizes. An oxide related luminescence, which is broad, in the red, and stable at high temperatures will be discussed as a possible source of this light emission. RP PROKES, SM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 247 Z9 254 U1 1 U2 11 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 JUN 21 PY 1993 VL 62 IS 25 BP 3244 EP 3246 DI 10.1063/1.109087 PG 3 WC Physics, Applied SC Physics GA LH607 UT WOS:A1993LH60700008 ER PT J AU BERMUDEZ, VM AF BERMUDEZ, VM TI INFRARED SPECTROSCOPIC STUDY OF THE CHEMISORPTION OF CF3 SPECIES ON SILICON SO APPLIED PHYSICS LETTERS LA English DT Article ID FLUOROCARBON FREE-RADICALS AB Infrared reflection absorption spectroscopy, in conjunction with Auger electron spectroscopy, is used to study the initial adsorption of CF3 species (mainly CF3+ ions) on polycrystalline Si in a model etching environment. Only monofluorosilyl groups (SiF) are observed, with no indication of adsorbed SiF2, SiF3, or CF(x)(1 less-than-or-equal-to x less-than-or-equal-to 3). The SiF exists in one of two chemically distinct environments, depending on the coverage of coadsorbed carbon. RP BERMUDEZ, VM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 7 Z9 7 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 21 PY 1993 VL 62 IS 25 BP 3297 EP 3299 DI 10.1063/1.109076 PG 3 WC Physics, Applied SC Physics GA LH607 UT WOS:A1993LH60700026 ER PT J AU QUONG, AA EGUILUZ, AG AF QUONG, AA EGUILUZ, AG TI 1ST-PRINCIPLES EVALUATION OF DYNAMIC-RESPONSE AND PLASMON DISPERSION IN METALS SO PHYSICAL REVIEW LETTERS LA English DT Article ID DENSITY-FUNCTIONAL APPROACH; LINEAR-RESPONSE; SEMICONDUCTORS; PSEUDOPOTENTIALS; INSULATORS; STATES AB We report an ab initio evaluation of the dynamical density-response function for real Al and Na. The method we employ is a generalization of the Dalgarno-Lewis scheme of perturbation theory to systems with a continuous spectrum and to dynamical problems. The crystal lattice is found to lower the plasmon frequency of Al for large wave vectors by as much as 4 eV. For this metal, agreement with experiment is excellent in the time-dependent local-density approximation for exchange correlation. The ''anomalous'' dispersion observed for Na for large wave vectors is assigned to subtler exchange-correlation effects. C1 MAX PLANCK GESELL, FRITZ HABER INST, W-1000 BERLIN 33, GERMANY. MONTANA STATE UNIV, DEPT PHYS, BOZEMAN, MT 59717 USA. RP USN, RES LAB, COMPLEX SYST THEORY BRANCH, CODE 6690, WASHINGTON, DC 20375 USA. NR 34 TC 90 Z9 90 U1 1 U2 8 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 JUN 21 PY 1993 VL 70 IS 25 BP 3955 EP 3958 DI 10.1103/PhysRevLett.70.3955 PG 4 WC Physics, Multidisciplinary SC Physics GA LH554 UT WOS:A1993LH55400030 ER PT J AU CARTER, WH DUNCAN, DD AF CARTER, WH DUNCAN, DD TI SCATTERING OF A LIGHT-BEAM FROM WAVES AT AN AIR-SEA INTERFACE SO APPLIED OPTICS LA English DT Article ID RADIOMETRY; COHERENCE; FIELDS; MEDIA AB The authors report a new theory that describes the scattering of an upward propagating laser beam from the sea through the air-sea interface in the presence of sea waves. The sea is assumed to be a uniform dielectric and conventional scattering theory is employed by using a modification to the first Born approximation that permits treatment of surface refraction phenomena. Methods of statistical radiometry are also used in a new manner by assuming that the surface scattering function for the sea waves can be treated by a quasi-homogeneous source model to calculate the second-order correlation functions for the partially coherent scattered field. These correlation functions yield a simple expression for the radiant intensity of the scattered field as the convolution of the Fourier transform of the complex degree of spectral coherence for the sea waves with the squared modulus of the angular spectrum of plane waves for the incident laser beam. We believe that this theory is a significant improvement over the models that are usually used for modeling this phenomenon. C1 JOHNS HOPKINS UNIV, APPL PHYS LAB, JOHNS HOPKINS RD, LAUREL, MD 20723 USA. RP CARTER, WH (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 20 TC 0 Z9 0 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JUN 20 PY 1993 VL 32 IS 18 BP 3286 EP 3294 PG 9 WC Optics SC Optics GA LG686 UT WOS:A1993LG68600016 PM 20829946 ER PT J AU ELIAS, NM AF ELIAS, NM TI ELLIPTIC POLARIMETRY OF THE INTERACTING BINARY STAR V367-CYGNI SO ASTROPHYSICAL JOURNAL LA English DT Article DE BINARIES, CLOSE; CIRCUMSTELLAR MATTER; POLARIZATION; STARS, INDIVIDUAL (V367-CYG) ID V-367 CYGNI; BETA LYRAE; POLARIZATION; ALGOLS; LIGHT AB Elliptical polarization measures of the interacting binary star V367 Cyg were obtained. A two-component model for the circumbinary environment has been constructed. The variable linear polarization component (approximately 1% peak-to-peak) arises from an electron envelope between the stars. Surrounding the entire system there is an extensive ring of material consisting of neutral hydrogen and dust which produces the constant linear polarization component (approximately 7%). The variable circular polarization is probably produced by the circumbinary dust as well. Problems with the removal of the interstellar polarization and the light dilution from a nearby star are discussed. An alternative model of the binary based on systemic magnetic fields is discussed but eventually discounted. Suggestions for further observations are presented. RP ELIAS, NM (reprint author), USN OBSERV,DEPT ASTROMETRY,DIV INTERFEROMETRY,3450 MASSACHUSETTS AVE NW,WASHINGTON,DC 20392, USA. NR 52 TC 2 Z9 2 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 JUN 20 PY 1993 VL 410 IS 2 BP 785 EP 795 DI 10.1086/172795 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LG695 UT WOS:A1993LG69500035 ER PT J AU STARK, G YOSHINO, K SMITH, PL ESMOND, JR ITO, K STEVENS, MH AF STARK, G YOSHINO, K SMITH, PL ESMOND, JR ITO, K STEVENS, MH TI HIGH-RESOLUTION ABSORPTION CROSS-SECTION MEASUREMENTS OF CARBON-MONOXIDE AT 20-K BETWEEN 96.7 AND 98.8 NANOMETERS SO ASTROPHYSICAL JOURNAL LA English DT Article DE MOLECULAR DATA; TECHNIQUES, SPECTROSCOPIC; ULTRAVIOLET, GENERAL ID INTERSTELLAR CO; 115 NM; PHOTODISSOCIATION; MOLECULES; PHOTOABSORPTION; SPECTRA; BANDS AB Photoabsorption cross sections for five CO bands, at wavelengths between 96.7 and 98.8 nm, have been measured at high-resolution in a supersonic jet-cooled source at the Photon Factory synchrotron facility. New integrated cross sections are reported for the K-X, L'-X, and L-X bands. Low-temperature spectra of the J-X and W-X bands, which were used in the determination of the absorbing CO column densities, are also presented. The rotational structures of the K-X, L'-X, and L-X bands do not overlap in the low-temperature (almost-equal-to 20 K) spectra, allowing for the first unambiguous determination of these band oscillator strengths. We also report revised room temperature measurements of integrated cross sections for the K-X, L'-X, and L-X bands, in which distortions in the measured spectra due to insufficient instrumental resolution have been minimized; the revised room temperature integrated cross sections are consistent with the low-temperature results. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138. NATL LAB HIGH ENERGY PHYS,PHOTON FACTORY,TSUKUBA,IBARAKI 305,JAPAN. RP STARK, G (reprint author), WELLESLEY COLL,DEPT PHYS,WELLESLEY,MA 02181, USA. OI Stevens, Michael/0000-0003-1082-8955 NR 22 TC 20 Z9 20 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUN 20 PY 1993 VL 410 IS 2 BP 837 EP 842 DI 10.1086/172801 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LG695 UT WOS:A1993LG69500041 ER PT J AU FOSTER, RS WOLSZCZAN, A CAMILO, F AF FOSTER, RS WOLSZCZAN, A CAMILO, F TI A NEW BINARY MILLISECOND PULSAR SO ASTROPHYSICAL JOURNAL LA English DT Article DE PULSARS, INDIVIDUAL, PSR J1713+0747 ID RADIO PULSARS; ASTROMETRY; SYSTEM AB A 4.57 ms pulsar, PSR J1713 + 0747, in a 67.8 day binary orbit with a low-mass (>0.28 M.) companion has been detected in a systematic search of the sky at high Galactic latitudes with the Arecibo radio telescope. The new pulsar is characterized by a weak magnetic field of 1.9 x 10(8) G and a spin-down age of 8.9 +/- 1.0 Gyr, making it probably one of the oldest neutron stars currently observed. The distance to the pulsar is approximately 0.8 kpc as indicated by its dispersion measure. Small timing residuals (approximately 1 mus), a relatively large flux density at GHz frequencies (S1400 approximately 3 mJy), and a narrow, sharply peaked pulse morphology, make PSR J1713 + 0747 a new celestial clock of extraordinary precision and a rare target for VLBI frame-tie experiments. C1 PENN STATE UNIV,DEPT ASTRON & ASTROPHYS,UNIV PK,PA 16802. PRINCETON UNIV,JOSEPH HENRY LABS,PRINCETON,NJ 08544. PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. RP FOSTER, RS (reprint author), USN,RES LAB,DIV REMOTE SENSING,CODE 7210,WASHINGTON,DC 20375, USA. NR 19 TC 61 Z9 62 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 JUN 20 PY 1993 VL 410 IS 2 BP L91 EP L94 DI 10.1086/186887 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LG697 UT WOS:A1993LG69700009 ER PT J AU HERTZ, P GRINDLAY, JE BAILYN, CD AF HERTZ, P GRINDLAY, JE BAILYN, CD TI A SUPERSOFT VARIABLE LOW-LUMINOSITY X-RAY SOURCE IN THE GLOBULAR-CLUSTER M3 SO ASTROPHYSICAL JOURNAL LA English DT Article DE GLOBULAR CLUSTERS, INDIVIDUAL (M3); NOVAE, CATACLYSMIC VARIABLES; X-RAYS, STARS ID WHITE-DWARFS; SYSTEMS; BINARY; STATE; NOVAE AB The globular cluster M3 (NGC 5272) was observed twice with the ROSAT high-resolution imager in order to study the low-luminosity X-ray source 1E 1339.8 + 2837. In 1992 January 1E 1339.8 + 2837 had an X-ray luminosity of 2 x 10(35) ergs s-1 (0.1-2.4 keV), over an order of magnitude brighter than it was when observed with the Einstein Observatory. The source was unresolved and very soft (kT congruent-to 20 eV); such supersoft outbursts would be difficult to detect in the vast majority of globular clusters which are more heavily absorbed than M3. In 1992 June the source was too faint to be detected (<2.8 x 10(33) ergs s-1). The soft outburst luminosity (L(bol) congruent-to 1.2 x 10(36) ergs s-1) and the blackbody radius (R congruent-to 7.7 x 10(8) cm) suggest that 1E 1339.8 + 2837 is a cataclysmic variable in which much of the luminosity is generated by steady nuclear burning of accreted material on the surface of the white dwarf primary. C1 YALE UNIV,DEPT ASTRON,NEW HAVEN,CT 06511. HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138. RP HERTZ, P (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7621-5,WASHINGTON,DC 20375, USA. NR 40 TC 33 Z9 33 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 JUN 20 PY 1993 VL 410 IS 2 BP L87 EP L90 DI 10.1086/186886 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LG697 UT WOS:A1993LG69700008 ER PT J AU WANG, YM AF WANG, YM TI FLUX-TUBE DIVERGENCE, CORONAL HEATING, AND THE SOLAR-WIND SO ASTROPHYSICAL JOURNAL LA English DT Article DE HYDROMAGNETICS; SUN, CORONA; SUN, MAGNETIC FIELDS; SUN, SOLAR WIND ID INTERPLANETARY MAGNETIC-FIELD; FLOW; MASS AB Using model calculations based on a self-consistent treatment of the coronal energy balance, we show how the magnetic flux-tube divergence rate controls the coronal temperature and the properties of the solar wind. For a fixed input of mechanical and Alfven-wave energy at the coronal base, we find that as the divergence rate increases, the maximum coronal temperature decreases but the mass flux leaving the Sun gradually increases. As a result, the asymptotic wind speed decreases with increasing expansion factor near the Sun, in agreement with empirical studies. As noted earlier by Withbroe, the calculated mass flux at the Sun is remarkably insensitive to parameter variations; when combined with magnetohydrodynamic considerations, this self-regulatory property of the model explains the observed constancy of the mass flux at Earth. RP USN, RES LAB, EO HULBURT CTR SPACE RES, CODE 7672W, WASHINGTON, DC 20375 USA. NR 17 TC 48 Z9 48 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD JUN 20 PY 1993 VL 410 IS 2 BP L123 EP L126 DI 10.1086/186895 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LG697 UT WOS:A1993LG69700017 ER PT J AU BRUECKNER, GE EDLOW, KL FLOYD, LE LEAN, JL VANHOOSIER, ME AF BRUECKNER, GE EDLOW, KL FLOYD, LE LEAN, JL VANHOOSIER, ME TI THE SOLAR ULTRAVIOLET SPECTRAL IRRADIANCE MONITOR (SUSIM) EXPERIMENT ON BOARD THE UPPER-ATMOSPHERE RESEARCH SATELLITE (UARS) SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID NM; STANDARDS; FLUX; SURF AB The state of solar ultraviolet in-irradiance measurements in 1978, when NASA requested proposals for a new generation of solar ultraviolet monitors to be flown on the Upper Atmosphere Research Satellite (UARS), is described. To overcome the radiometric uncertainties that plagued the measurements at this time, the solar ultraviolet spectral irradiance monitor (SUSIM) instrument design included in-flight calibration light sources and multichannel photometers. Both are aimed at achieving a maximum precision of the SUSIM measurements over a long period of time, e.g., one solar cycle. The design of the SUSIM-UARS instrument is compared with the original design specifications for the UARS instruments. Details including optical train, filters, detectors, and contamination precautions are described. Also discussed are the SUSIM-UARS preflight calibration and characterization, as well as the results of the inflight performance of the instrument during the first 3 months of operation. Finally, flight operations, observation strategy, and data reduction schemes are outlined. C1 INTERFEROMETR INC,VIENNA,VA 22180. RP BRUECKNER, GE (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 34 TC 143 Z9 144 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JUN 20 PY 1993 VL 98 IS D6 BP 10695 EP 10711 DI 10.1029/93JD00410 PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA LJ840 UT WOS:A1993LJ84000029 ER PT J AU BLAUCH, DN SAVEANT, JM AF BLAUCH, DN SAVEANT, JM TI EFFECTS OF LONG-RANGE ELECTRON-TRANSFER ON CHARGE-TRANSPORT IN STATIC ASSEMBLIES OF REDOX CENTERS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ALUMINUM-OXIDE FILMS; ORGANIZED BILAYER ASSEMBLIES; LATERAL DIFFUSION; SUPRAMOLECULAR CHEMISTRY; MOLECULAR RECOGNITION; INFRARED-SPECTROSCOPY; PERCOLATION-THRESHOLD; BIOLOGICAL MOLECULES; LANGMUIR MONOLAYERS; DISTANCE DEPENDENCE AB Simulations employing random walks of electrons on distributions of redox molecules in square and simple cubic lattices have been performed to evaluate the influence of long-range electron hopping on the dynamics of charge transport in static assemblies of redox centers. For electron exchange solely between molecules in contact, classical percolation behavior is observed. Electron hopping across distances larger than the contact distance leads to nonzero rates of charge propagation, as measured by an apparent diffusion coefficient, D(ap), at all concentrations of electroactive centers, including concentrations below the percolation threshold. In the limit where the rate of electron hopping becomes relatively insensitive to the distance separating the reactants, D(ap) is found to be directly proportional to the total concentration of redox centers. The results of simulations performed by using parameters appropriate for real systems indicate that at redox concentrations above the percolation threshold D(ap) differs only slightly from that expected for simple percolation behavior; below the critical concentration, charge transport over macroscopic distances still occurs but D(ap) diminishes rapidly toward zero as the concentration of redox centers decreases. C1 UNIV PARIS 07,ELECTROCHIM MOLEC LAB,CNRS,URA 438,F-75251 PARIS 05,FRANCE. RP BLAUCH, DN (reprint author), USN,RES LAB,SURFACE CHEM BRANCH,CODE 6170,4555 OVERLOOK AVE,WASHINGTON,DC 20375, USA. NR 74 TC 73 Z9 73 U1 3 U2 17 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 JUN 17 PY 1993 VL 97 IS 24 BP 6444 EP 6448 DI 10.1021/j100126a019 PG 5 WC Chemistry, Physical SC Chemistry GA LH120 UT WOS:A1993LH12000019 ER PT J AU DOYLE, RJ AF DOYLE, RJ TI FORMATION OF NITRIC-ACID FROM GAS-PHASE IONIC COMPLEXES OF AMMONIUM-NITRATE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note RP DOYLE, RJ (reprint author), USN,RES LAB,DIV CHEM,CODE 6110D,WASHINGTON,DC 20375, USA. NR 17 TC 4 Z9 4 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD JUN 16 PY 1993 VL 115 IS 12 BP 5300 EP 5301 DI 10.1021/ja00065a053 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA LH977 UT WOS:A1993LH97700053 ER PT J AU WULFSBERG, EA MIRKINSON, LJ MEISTER, SJ AF WULFSBERG, EA MIRKINSON, LJ MEISTER, SJ TI AUTOSOMAL-DOMINANT TETRAMELIC POSTAXIAL OLIGODACTYLY SO AMERICAN JOURNAL OF MEDICAL GENETICS LA English DT Article DE HOMEOBOX GENES; ULNAR DEFICIENCY; HOX-4 GENES; MORPHOGEN GRADIENT AB Postaxial limb deficiencies are most frequently unilateral and sporadic with deficiencies of the ulnar ray about one-third as common as those affecting the radial ray. Postaxial deficiency occurs in a number of genetic and sporadic syndromes, but isolated inherited tetramelic, postaxial oligodactyly has to our knowledge not been described. We report an affected mother and her 3 affected children from a 4-generation family with apparent autosomal dominant, non-syndromic, tetramelic, postaxial oligodactyly. The affected individuals manifest a very uniform pattern of postaxial deficiency ranging from complete absence of the 5th metacarpals, metatarsals, and phalanges to complete absence of the 5th metacarpals and metatarsals, but with some residual distal 5th phalanges. Limb buds may be considered a single developmental field with development proceeding rostral to caudal. Digit formation is apparently controlled by the zone of polarizing activity which releases a diffusible morphogen specifying positional information along the anterior/posterior axis. Recent investigations using chick and mouse embryo models suggest that 5' members of the Hox-4 gene cluster are responsible for interpreting this positional information to effect digit formation. The present family may represent a defect in Hox-4 gene patterning of hand and foot formation, an abnormality in morphogen gradient formation or alternately an inability of the most ulnar rays to respond to morphogen (receptor defect). C1 NATL NAVAL MED CTR, DEPT PEDIAT, BETHESDA, MD 20814 USA. USN HOSP, DEPT PEDIAT, SAN DIEGO, CA 92134 USA. RP WULFSBERG, EA (reprint author), UNIV MARYLAND, SCH MED,DEPT PEDIAT,DIV HUMAN GENET,SUITE 400, 405 W REDWOOD ST, BALTIMORE, MD 21201 USA. NR 15 TC 4 Z9 4 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 JUN 15 PY 1993 VL 46 IS 5 BP 579 EP 583 DI 10.1002/ajmg.1320460524 PG 5 WC Genetics & Heredity SC Genetics & Heredity GA LF981 UT WOS:A1993LF98100023 PM 8100684 ER PT J AU BIBLARZ, O BROWN, GS AF BIBLARZ, O BROWN, GS TI PLASMA-SHEATH APPROXIMATE SOLUTIONS FOR PLANAR AND CYLINDRICAL ANODES AND PROBES SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB Anode sheaths are explored in detail for collisional, identical-specie-temperature plasmas where sheath dimensions are in the micron range. The selected approach involves postulation of a specific electric field distribution with three shape factors. Previous research using this approach is verified and expanded upon using greater parameter ranges. z, a dimensionless quantity specifying plasma composition and condition, groups diverse plasmas into families exhibiting similar sheath characteristics. eta, a nondimensional ratio of electrical energy to thermal energy in the sheath, allows temperature effects to be studied. This investigation focuses on plasma families that span a z range of 1.1729 to 2.1493 at eta values defined by discrete plasma temperatures of 6000, 3000, and 300 K. Results indicate that at the lower temperatures, charge production in the outer sheath is somewhat generic to the electric field distribution, and that the sheaths themselves are nearly unaffected by substantial changes in temperature (i.e., eta). Conversely, sheath density and extent are shown to vary significantly for differing z values. Equations governing cylindrical anodes generate sheaths that are virtually identical to corresponding planar cases. It is shown that only those anodes whose radii are comparable to the plasma's characteristic radius (gamma) must be treated with the cylindrical formulation; low- and moderate-pressure plasmas would require micron-diameter anodes to be thus affected. Finally, an analytical approach shown yields solutions that confirm the numerical results, and offers an algebraic approximation for high-eta plasmas. RP BIBLARZ, O (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 14 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 15 PY 1993 VL 73 IS 12 BP 8111 EP 8121 DI 10.1063/1.353927 PG 11 WC Physics, Applied SC Physics GA LH229 UT WOS:A1993LH22900014 ER PT J AU KALANTAR, DH HAMMER, DA MITTAL, KC QI, N YOUNG, FC STEPHANAKIS, SJ BURKHALTER, PG MEHLMAN, G NEWMAN, DA AF KALANTAR, DH HAMMER, DA MITTAL, KC QI, N YOUNG, FC STEPHANAKIS, SJ BURKHALTER, PG MEHLMAN, G NEWMAN, DA TI K-SHELL X-RAY YIELD SCALING FOR ALUMINUM X-PINCH PLASMAS SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB We report results from experiments performed to measure and characterize the intense K-shell radiation from aluminum x-pinch plasmas at peak driving currents ranging from 280 kA to 1.0 MA. Single pulse aluminum K-shell (predominantly line radiation at 1.6-2 keV) x-ray yields ranged from 7.6 J at 290 kA to 240 J at 1.0 MA. In the range from 280 to 470 kA, the yield scales with current to the power of 3.6, whereas nonoptimized K-shell yields at 800 kA and 1.0 MA indicate a power of about 3 or higher. C1 USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375. USN,RES LAB,DIV CONDENSED MATTER & RADIAT SCI,WASHINGTON,DC 20375. BHABHA ATOM RES CTR,DIV PLASMA PHYS,BOMBAY 400085,INDIA. RP KALANTAR, DH (reprint author), CORNELL UNIV,PLASMA STUDIES LAB,ITHACA,NY 14853, USA. NR 14 TC 22 Z9 22 U1 0 U2 4 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 JUN 15 PY 1993 VL 73 IS 12 BP 8134 EP 8138 DI 10.1063/1.353452 PG 5 WC Physics, Applied SC Physics GA LH229 UT WOS:A1993LH22900017 ER PT J AU SHIH, A COWAN, PL SOUTHWORTH, S FOTIADIS, L HOR, C KARLIN, B MOORE, F DOBISZ, E DIETRICH, H AF SHIH, A COWAN, PL SOUTHWORTH, S FOTIADIS, L HOR, C KARLIN, B MOORE, F DOBISZ, E DIETRICH, H TI LATTICE POSITION OF SI IN GAAS DETERMINED BY X-RAY STANDING-WAVE MEASUREMENTS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SYNCHROTRON RADIATION BEAMLINE; HIGH-ENERGY-RESOLUTION; SILICON; IMPLANTATION; DIFFUSION AB The x-ray standing wave (XSW) technique was applied to determine the lattice location of Si impurity atoms in GaAs(100) crystals. The synchrotron radiation of X24A at the national synchrotron light source was utilized to set up backreflection XSW, an experimental geometry which drastically relaxes the otherwise stringent requirement on the lattice perfection. Specifically, the lattice sites were determined with respect to the [311] reflection planes which differentiate a Ga site from an As site. With the aid of an appropriate choice of the x-ray fluorescence filter, we were able to study GaAs(100) samples with very low levels of Si impurities. On a sample doped with 4 X 10(18) cm-3 Si during the molecular-beam epitaxy growth, we found that the Si atoms predominantly occupied the Ga sites. On both an ion-implanted sample after annealing and a sample with Si impurities introduced by thermal diffusion, about 30% of the Si atoms occupied the Ga sites, and the rest occupied random sites. The As site occupation was less than 6%. Suggestions are made for further experiments with improved sensitivity. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD. USA,ELECTR COMMAND,FT MONMOUTH,NJ 07703. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. WHITMAN COLL,DEPT PHYS,WALLA WALLA,WA 99362. RP SHIH, A (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 24 TC 1 Z9 1 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 JUN 15 PY 1993 VL 73 IS 12 BP 8161 EP 8168 DI 10.1063/1.353430 PG 8 WC Physics, Applied SC Physics GA LH229 UT WOS:A1993LH22900021 ER PT J AU GLENDENING, JW AF GLENDENING, JW TI NONLINEAR DISPLACEMENT OF THE GEOSTROPHIC VELOCITY JET CREATED BY MASS IMBALANCE SO JOURNAL OF THE ATMOSPHERIC SCIENCES LA English DT Article ID BOUNDARY-LAYER; ADJUSTMENT AB Nonlinear geostrophic adjustment to a mass imbalance is investigated analytically, focusing on horizontal displacement of the equilibrium velocity jet. For no initially imposed horizontal length scale, the jet displacement is the difference between the deformation radii of the two initial states; as the mass imbalance increases, the displacement approaches the deformation radius of the dominant state. For a disturbance of finite width, the jet displacement decreases as the initial width decreases, but disturbances of relatively small width can still produce appreciable displacements. For an axisymmetric disturbance, geometric dispersion reduces the jet displacement. A two-layer model creates two jets, the displacements of the lower and upper jets being, respectively, slightly larger and considerably smaller than that predicted by the one-layer model. For stratified fluids, these mass differences represent horizontal changes in stratification. An example of jet displacement resulting from horizontal stratification differences occurs at a surface temperature discontinuity, where reduced stratification produced by vertical mixing over a war-mer surface creates jets in the boundary layer and in the free atmosphere: when the boundary layer becomes well mixed, the jet displacements approach a mesoscale deformation radius that depends upon the free atmosphere stratification and the boundary-layer depth. C1 USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93940. NR 15 TC 7 Z9 7 U1 0 U2 0 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 JUN 15 PY 1993 VL 50 IS 12 BP 1617 EP 1628 DI 10.1175/1520-0469(1993)050<1617:NDOTGV>2.0.CO;2 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA LJ887 UT WOS:A1993LJ88700001 ER PT J AU TSAI, TE FRIEBELE, EJ GRISCOM, DL AF TSAI, TE FRIEBELE, EJ GRISCOM, DL TI THERMAL-STABILITY OF PHOTOINDUCED GRATINGS AND PARAMAGNETIC CENTERS IN GE-DOPED AND GE/P-DOPED SILICA OPTICAL FIBERS SO OPTICS LETTERS LA English DT Article ID DEFECT CENTERS; 2ND-HARMONIC GENERATION; GLASS; LIGHT AB The electron-spin-resonance spectra of paramagnetic defects in Ge/P-doped silica fibers prepared with second-harmonic generation (SHG) are compared with those induced in Ge- and Ge/P-doped silica preforms by 5-eV photons. Among the defects observed, the thermal stability of Ge E'-type centers is similar to that of photoinduced Bragg grating efficiency but not of SHG efficiency. The isochronal anneal curves of the Ge(1) and Ge(2) centers in Ge/P-doped silica correlate well with SHG efficiency, but the agreement is not nearly so good in silica containing only Ge. Only the thermal behavior of photoinduced Ge E(d1)' centers is similar to that of SHG efficiency in both materials, albeit only in the initial stages of annealing. C1 VIRGINIA POLYTECH INST & STATE UNIV,BLACKSBURG,VA 24061. RP TSAI, TE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 23 TC 23 Z9 23 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 JUN 15 PY 1993 VL 18 IS 12 BP 935 EP 937 DI 10.1364/OL.18.000935 PG 3 WC Optics SC Optics GA LF889 UT WOS:A1993LF88900001 PM 19823250 ER PT J AU SNOW, ES CAMPBELL, PM KATZER, DS AF SNOW, ES CAMPBELL, PM KATZER, DS TI OPTICAL-ABSORPTION SPECTROSCOPY OF SINGLE DEFECTS IN GAAS/ALXGA1-X AS TUNNEL STRUCTURES SO PHYSICAL REVIEW B LA English DT Note ID MOLECULES; NOISE; BARRIERS; CRYSTAL; STATES; GAAS AB We measure the optical absorption spectra of single defects in GaAs/Al0.35Ga0.65As tunnel structures. The optically induced change in charge state of individual defects produces a measurable discrete change in resistance in sufficiently small-area structures. Measuring the rate of optical excitation as a function of wavelength yields the optical absorption spectrum of an individual defect or impurity. These experiments demonstrate the feasibility of single-defect optical spectroscopy for a general class of defects or impurities in solids. RP SNOW, ES (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Katzer, D. Scott/N-7841-2013 NR 15 TC 0 Z9 0 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 JUN 15 PY 1993 VL 47 IS 23 BP 16032 EP 16035 DI 10.1103/PhysRevB.47.16032 PG 4 WC Physics, Condensed Matter SC Physics GA LJ154 UT WOS:A1993LJ15400093 ER PT J AU GRAGG, WB AF GRAGG, WB TI POSITIVE-DEFINITE TOEPLITZ MATRICES, THE ARNOLDI PROCESS FOR ISOMETRIC OPERATORS, AND GAUSSIAN QUADRATURE ON THE UNIT-CIRCLE SO JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS LA English DT Article DE TOEPLITZ MATRICES; UNITARY HESSENBERG MATRICES; SZEGO POLYNOMIALS ID TIME-SERIES; ALGORITHM AB We show that the well-known Levinson algorithm for computing the inverse Cholesky factorization of positive definite Toeplitz matrices can be viewed as a special case of a more general process. The latter process provides a very efficient implementation of the Arnoldi process when the underlying operator is isometric. This is analogous with the case of Hermitian operators where the Hessenberg matrix becomes tridiagonal and results in the Hermitian Lanczos process. We investigate the structure of the Hessenberg matrices in the isometric case and show that simple modifications of them move all their eigenvalues to the unit circle. These eigenvalues are then interpreted as abscissas for analogs of Gaussian quadrature, now on the unit circle instead of the real line. The trapezoidal rule appears as the analog of the Gauss-Legendre formula. C1 USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93940. NR 17 TC 75 Z9 76 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-0427 J9 J COMPUT APPL MATH JI J. Comput. Appl. Math. PD JUN 14 PY 1993 VL 46 IS 1-2 BP 183 EP 198 DI 10.1016/0377-0427(93)90294-L PG 16 WC Mathematics, Applied SC Mathematics GA LH600 UT WOS:A1993LH60000012 ER PT J AU AMMAR, GS GRAGG, WB REICHEL, L AF AMMAR, GS GRAGG, WB REICHEL, L TI AN ANALOG FOR SZEGO POLYNOMIALS OF THE CLENSHAW ALGORITHM SO JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS LA English DT Article DE CLENSHAW ALGORITHM; SZEGO POLYNOMIAL AB Linear combinations of polynomials that are orthogonal with respect to an inner product defined on (part of) the real axis are commonly evaluated by the Clenshaw algorithm. We present an analogous algorithm for the evaluation of a linear combination SIGMA(j=0)(n)alpha(j)phi(j) of polynomials phi(j) that are orthogonal with respect to an inner product defined on (part of) the unit circle. The phi(j) are known as Szego polynomials, and find applications, e.g., in signal processing. We also discuss how to express SIGMA(j=0)(n)alpha(j)phi(j) as a linear combination of monomials. C1 NO ILLINOIS UNIV,DEPT MATH SCI,DE KALB,IL 60115. USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93940. KENT STATE UNIV,DEPT MATH & COMP SCI,KENT,OH 44242. NR 9 TC 7 Z9 7 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-0427 J9 J COMPUT APPL MATH JI J. Comput. Appl. Math. PD JUN 14 PY 1993 VL 46 IS 1-2 BP 211 EP 216 DI 10.1016/0377-0427(93)90296-N PG 6 WC Mathematics, Applied SC Mathematics GA LH600 UT WOS:A1993LH60000014 ER PT J AU MCCOY, PA AF MCCOY, PA TI NEAR-CIRCULARITY OF THE ERROR CURVE IN CHEBYSHEV-APPROXIMATION OF SOLUTIONS TO A CLASS OF ELLIPTIC PARTIAL-DIFFERENTIAL EQUATIONS IN THE COMPLEX-PLANE SO JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS LA English DT Article DE COMPLEX CHEBYSHEV APPROXIMATION; ERROR CURVE; GEOMETRIC PROPERTIES; CARATHEODORY-FEJER THEOREM; HELMHOLTZ PARTIAL DIFFERENTIAL EQUATION; FUNCTION-THEORETIC METHODS AB Let PHI be an analytic solution of the Helmholtz equation [del2 + F(r2)]PHI(r, theta) = 0 on the open unit disk DELTA that is continuous on the closure DELTABAR. Let the function F(r2) be analytic and nonpositive on DELTABAR. DELTABAR, let PHI(n)* be an approximation of PHI relative to an appropriate subspace of solutions whose restrictions to partial derivative DELTA are polynomials of degree at most n. The error curve arises as the image of partial derivative DELTA under the map PHI - PHI(n)*. Geometric properties of the curve relating to the modulus and winding number characterize the best and near-best approximations. Among them are those when PHI(n)* is the Chebyshev approximation, the curve is a near-perfect circle with winding number n + 1. These attributes develop function-theoretically and lead to a constructive procedure for determining near-optimal approximations of PHI that are as close to best as the error curve is close to circular. Numerical examples are presented that are at least as accurate as the corresponding approximations of e(z) on DELTABAR which arise in analytic function theory. C1 USN ACAD,DEPT MATH,ANNAPOLIS,MD 21402. NR 15 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-0427 J9 J COMPUT APPL MATH JI J. Comput. Appl. Math. PD JUN 14 PY 1993 VL 46 IS 1-2 BP 315 EP 326 DI 10.1016/0377-0427(93)90305-U PG 12 WC Mathematics, Applied SC Mathematics GA LH600 UT WOS:A1993LH60000023 ER PT J AU MCELVANY, SW CALLAHAN, JH ROSS, MM LAMB, LD HUFFMAN, DR AF MCELVANY, SW CALLAHAN, JH ROSS, MM LAMB, LD HUFFMAN, DR TI LARGE ODD-NUMBERED CARBON CLUSTERS FROM FULLERENE-OZONE REACTIONS SO SCIENCE LA English DT Article AB The odd-numbered carbon clusters C119, C129, and C139 have been observed in the mass spectra of toluene extracts of fullerene soots and of the products of ozone-fullerene reactions. Specifically, ozone-C60 reactions yield C119, ozone-C70 reactions yield C139, and ozone-(C60/C70) reactions produce C119, C129, and C139. These unexpected species correspond to dimers of C60, C60/C70, and C70, respectively, less one carbon atom, and are stable gas-phase ions with behavior similar to that of fullerenes. The results suggest a new route to functionalization and derivatization of fullerenes through controlled ozone-catalyzed cage-opening reactions. C1 UNIV ARIZONA,DEPT PHYS,TUCSON,AZ 85721. RP MCELVANY, SW (reprint author), USN,RES LAB,DIV CHEM,CODE 6113,WASHINGTON,DC 20375, USA. NR 12 TC 105 Z9 107 U1 2 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 JUN 11 PY 1993 VL 260 IS 5114 BP 1632 EP 1634 DI 10.1126/science.260.5114.1632 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LG176 UT WOS:A1993LG17600024 PM 17810205 ER PT J AU COULLARD, CR DELGRECO, JG WAGNER, DK AF COULLARD, CR DELGRECO, JG WAGNER, DK TI RECOGNIZING A CLASS OF BICIRCULAR MATROIDS SO DISCRETE APPLIED MATHEMATICS LA English DT Article ID SUBGRAPHS; GRAPHS AB This paper presents a polynomial-time algorithm for solving a restricted version of the recognition problem for bicircular matroids. Given a matroid M, the problem is to determine whether M is bicircular. Chandru, Coullard and Wagner showed that this problem is NP-hard in general. The main tool in the development of the algorithm as well as the main theoretical contribution of the paper is a set of necessary and sufficient conditions for a given matroid to be the bicircular matroid of a given graph. As a final result, the complexity result of Chandru et al. is strenghtened. C1 NORTHWESTERN UNIV,SCH IND ENGN & MANAGEMENT SCI,EVANSTON,IL 60208. LOYOLA UNIV,DEPT MATH SCI,CHICAGO,IL 60626. OFF NAVAL RES,DEPT MATH SCI,ARLINGTON,VA 22217. GEORGE MASON UNIV,DEPT OPERAT RES & APPL STAT,FAIRFAX,VA 22030. NR 24 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-218X J9 DISCRETE APPL MATH JI Discret Appl. Math. PD JUN 10 PY 1993 VL 43 IS 3 BP 197 EP 215 DI 10.1016/0166-218X(93)90112-2 PG 19 WC Mathematics, Applied SC Mathematics GA LK274 UT WOS:A1993LK27400002 ER PT J AU SZU, H GARCIA, JP AF SZU, H GARCIA, JP TI RADAR JITTER SUPPRESSION BY SELF-REFERENCE MATCHED-FILTER SO ELECTRONICS LETTERS LA English DT Article DE RADAR; SIGNAL PROCESSING AB The effectiveness of moving target indicator (MTI) processing degrades substantially in the presence of even moderate phase jitter or phase noise. A technique originally developed for processing images viewed through turbulent media is applied to correct for phase jitter in MTI radar processing. RP SZU, H (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 4 TC 2 Z9 2 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD JUN 10 PY 1993 VL 29 IS 12 BP 1045 EP 1046 DI 10.1049/el:19930697 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA LN441 UT WOS:A1993LN44100001 ER PT J AU HERMAN, GS WOICIK, JC ANDREWS, AB ERSKINE, JL AF HERMAN, GS WOICIK, JC ANDREWS, AB ERSKINE, JL TI HIGH-RESOLUTION PHOTOELECTRON-SPECTROSCOPY STUDY OF (ROOT-3X-ROOT-3) R30-DEGREES-AG ON SI(111) SO SURFACE SCIENCE LA English DT Letter ID SURFACE; AG/SI(111) AB High-resolution surface and bulk sensitive photoemission were used to study the Si2p core level from the (square-root 3 x square-root 3)R30-degrees-Ag/Si(111) surface. Four components of the Si2p levels are observed for this system. Their relative positions are found to be independent with respect to sample preparation, suggesting no net change in the local atomic order of the square-root 3 domains. However, their relative intensities, measured for surfaces prepared at deposition temperatures of 350 and 530-degrees-C, show significant differences which are assigned to changes in the relative square-root 3 domain sizes. C1 USN,RES LAB,WASHINGTON,DC 20375. NATL INST STAND & TECHNOL,GAITHERSBURG,MD. AT&T BELL LABS,MURRAY HILL,NJ 07974. UNIV TEXAS,AUSTIN,TX 78712. NR 16 TC 22 Z9 22 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN 10 PY 1993 VL 290 IS 1-2 BP L643 EP L648 PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LG187 UT WOS:A1993LG18700001 ER PT J AU DENNIS, ML DULING, IN AF DENNIS, ML DULING, IN TI ROLE OF DISPERSION IN LIMITING PULSE-WIDTH IN FIBER LASERS SO APPLIED PHYSICS LETTERS LA English DT Article ID MIRROR AB Generation of spectral sidebands is characteristic of ultrashort soliton all-fiber lasers. We relate the generation of these sidebands to a loss mechanism dependent on the pulse duration and total cavity dispersion. We confirm experimentally using an erbium figure eight laser that the minimum pulse duration is therefore limited by the total dispersion. Short cavities constructed from low-dispersion components allow shorter pulses to be obtained, and we demonstrate pulse durations as short as 160 fs. RP DENNIS, ML (reprint author), USN,RES LAB,CODE 570,WASHINGTON,DC 20375, USA. NR 13 TC 30 Z9 31 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 JUN 7 PY 1993 VL 62 IS 23 BP 2911 EP 2913 DI 10.1063/1.109194 PG 3 WC Physics, Applied SC Physics GA LE985 UT WOS:A1993LE98500005 ER PT J AU CHRISTODOULOU, D GEORGE, C KEEFER, LK AF CHRISTODOULOU, D GEORGE, C KEEFER, LK TI AN UNUSUAL BI-TRI-BINUCLEAR SANDWICH COMPLEX FORMED IN THE REACTION OF CUCL2 WITH THE ET2N-N2O2- ION SO JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS LA English DT Article ID NITRIC-OXIDE; MOLECULAR-STRUCTURE; CRYSTAL-STRUCTURE; LIGANDS; CHEMISTRY; EXCHANGE; ABILITY AB Reaction of the Et2N-N2O2- ligand with Cu(II) ions in methanol produces a mixed complex, shown by X-ray crystallography to consist of simple, alkoxo-bridged bi- and tri-nuclear units held together in a discrete triple-decker array. C1 NCI,FREDERICK CANC RES & DEV CTR,COMPARAT CARCINOGENESIS LAB,CHEM SECT,FREDERICK,MD 21702. USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RI Keefer, Larry/N-3247-2014 OI Keefer, Larry/0000-0001-7489-9555 NR 23 TC 28 Z9 28 U1 0 U2 0 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0022-4936 J9 J CHEM SOC CHEM COMM JI J. Chem. Soc.-Chem. Commun. PD JUN 7 PY 1993 IS 11 BP 937 EP 939 DI 10.1039/c39930000937 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA LG166 UT WOS:A1993LG16600028 ER PT J AU LENNON, P AF LENNON, P TI CASE 46-1992 - CORRECTION SO NEW ENGLAND JOURNAL OF MEDICINE LA English DT Letter RP LENNON, P (reprint author), NATL NAVAL MED CTR, BETHESDA, MD 20889 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU MASS MEDICAL SOC PI BOSTON PA 10 SHATTUCK, BOSTON, MA 02115 SN 0028-4793 J9 NEW ENGL J MED JI N. Engl. J. Med. PD JUN 3 PY 1993 VL 328 IS 22 BP 1642 EP 1642 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA LE289 UT WOS:A1993LE28900031 PM 8487816 ER PT J AU PEELER, DP AF PEELER, DP TI THE BLACK-IMAGE IN THE NEW-DEAL - THE POLITICS OF FSA PHOTOGRAPHY - NATANSON,N SO AMERICAN HISTORICAL REVIEW LA English DT Book Review RP PEELER, DP (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER HISTORICAL REVIEW PI WASHINGTON PA 400 A ST SE, WASHINGTON, DC 20003 SN 0002-8762 J9 AM HIST REV JI Am. Hist. Rev. PD JUN PY 1993 VL 98 IS 3 BP 955 EP 955 DI 10.2307/2167717 PG 1 WC History SC History GA LH603 UT WOS:A1993LH60300174 ER PT J AU WYATT, JR ROSEPEHRSSON, SL CECIL, TL CROSSMAN, KP MEHTA, NK YOUNG, R AF WYATT, JR ROSEPEHRSSON, SL CECIL, TL CROSSMAN, KP MEHTA, NK YOUNG, R TI COULOMETRIC METHOD FOR THE QUANTIFICATION OF LOW-LEVEL CONCENTRATIONS OF HYDRAZINE AND MONOMETHYLHYDRAZINE SO AMERICAN INDUSTRIAL HYGIENE ASSOCIATION JOURNAL LA English DT Article ID 1,1-DIMETHYLHYDRAZINE; CHROMATOGRAPHY AB A sensitive and simple coulometric method has been developed for the determination of hydrazine and monomethylhydrazine (MMH) in solution. This coulometric method can readily be used in conjunction with impingers to measure the amount of hydrazine and MMH in air. The method has a limit of detection of less than 25 ng of hydrazine or MMH in 40 mL of solution, which corresponds to less than 2 ppb in 10 L of air. External standards are not necessary as calibration can be performed electronically. The dynamic range of the coulometric method extends from 25 ng to greater than 2500 ng in 40 mL of solution. At the higher concentrations the relative standard deviation was about 2%. The method gave excellent agreement with the two current National Institute for Occupational Safety and Health approved methods at the higher end of this concentration range. C1 GEOCENTERS INC,FT WASHINGTON,MD. UNIV PUERTO RICO,MAYAGUEZ,PR 00708. KENNEDY SPACE CTR,CAPE CANAVERAL,FL. RP WYATT, JR (reprint author), USN,RES LAB,DIV CHEM,CODE 6110,WASHINGTON,DC 20375, USA. NR 15 TC 7 Z9 7 U1 0 U2 1 PU AMER INDUSTRIAL HYGIENE ASSOC PI FAIRFAX PA 2700 PROSPERITY AVE #250, FAIRFAX, VA 22031-4307 SN 0002-8894 J9 AM IND HYG ASSOC J JI Am. Ind. Hyg. Assoc. J. PD JUN PY 1993 VL 54 IS 6 BP 285 EP 292 DI 10.1202/0002-8894(1993)054<0285:CMFTQO>2.0.CO;2 PG 8 WC Environmental Sciences; Public, Environmental & Occupational Health SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health GA LR490 UT WOS:A1993LR49000005 ER PT J AU HERMAN, BE BAUM, S DENOBILE, J VOLPE, RJ AF HERMAN, BE BAUM, S DENOBILE, J VOLPE, RJ TI MASSIVE BLEEDING FROM RECTAL VARICES SO AMERICAN JOURNAL OF GASTROENTEROLOGY LA English DT Article ID PORTAL-HYPERTENSION; ANORECTAL VARICES; COLONIC VARICES; SCLEROTHERAPY; HEMORRHOIDS; CIRRHOSIS AB An elderly female who experienced a life-threatening bleed from an isolated rectal varix is presented. She failed endoscopic injection sclerotherapy but responded to surgical ligation. The literature concerning well-documented bleeding from eight cases of rectal varices is reviewed. Nomenclature, diagnosis, and therapy are emphasized. C1 NATL NAVAL MED CTR, DEPT SURG, BETHESDA, MD 20814 USA. RP HERMAN, BE (reprint author), USN, NATL MED CTR, DEPT INTERNAL MED, DIV GASTROENTEROL, BETHESDA, MD 20889 USA. NR 28 TC 26 Z9 26 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0002-9270 J9 AM J GASTROENTEROL JI Am. J. Gastroenterol. PD JUN PY 1993 VL 88 IS 6 BP 939 EP 942 PG 4 WC Gastroenterology & Hepatology SC Gastroenterology & Hepatology GA LF919 UT WOS:A1993LF91900028 PM 8503392 ER PT J AU BAQAR, S HAYES, CG MURPHY, JR WATTS, DM AF BAQAR, S HAYES, CG MURPHY, JR WATTS, DM TI VERTICAL TRANSMISSION OF WEST NILE VIRUS BY CULEX AND AEDES SPECIES MOSQUITOS SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID TRANS-OVARIAL TRANSMISSION; JAPANESE ENCEPHALITIS-VIRUS; UNIVITTATUS THEOBALD; DENGUE VIRUSES; AEGYPTI; TRITAENIORHYNCHUS; SINDBIS AB Experiments were conducted to determine whether West Nile (WN) virus was transmitted vertically by colonized strains of Aedes albopictus, Ae. aegypti, and Culex tritaeniorhynchus. Female mosquitoes were infected by intrathoracic inoculation with WN virus, and the F1 progeny were tested for virus by the fluorescence antibody technique and the newborn mouse assay. Each of the three mosquito species transmitted WN virus to F1 adults derived from immature forms reared at 26-degrees-C. The minimal filial infection rate (MFIR) ranged from 1:124 to 1:138 for Ae. albopictus, from 1:62 to 1:172 for Ae. aegypti, and from 1:325 to 1:859 for Cx. tritaeniorhynchus. The MFIR for Cx. tritaeniorhynchus reared at 20-degrees-C was 1:213 for larvae and 1:390 for pupae, and 1:208 for larvae and 1:554 for pupae reared at 26-degrees-C. These data are the first reported evidence of vertical transmission of WN virus by mosquitoes, and therefore warrant further studies to determine whether vertical transmission occurs among WN viral-infected mosquitoes in nature. C1 USN,MED RES UNIT,INFECT DIS THREAT ASSESSMENT RES PROGRAM,BETHESDA,MD 20814. USN,MED RES UNIT,CAIRO,EGYPT. UNIV TEXAS,HLTH SCI CTR,CTR INFECT DIS,HOUSTON,TX 77225. RP BAQAR, S (reprint author), UNIV MARYLAND,SCH MED,INT HLTH PROGRAM,BALTIMORE,MD 21201, USA. FU NIAID NIH HHS [AI-10049, AI-16289] NR 39 TC 71 Z9 76 U1 0 U2 12 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DRIVE SUITE 130, MCLEAN, VA 22101 SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD JUN PY 1993 VL 48 IS 6 BP 757 EP 762 PG 6 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA LR003 UT WOS:A1993LR00300004 PM 8333569 ER PT J AU CORWIN, A HABIB, M WATTS, D DARWISH, M OLSON, J BOTROS, B HIBBS, R KLEINOSKY, M LEE, HW SHOPE, R KILPATRICK, M AF CORWIN, A HABIB, M WATTS, D DARWISH, M OLSON, J BOTROS, B HIBBS, R KLEINOSKY, M LEE, HW SHOPE, R KILPATRICK, M TI COMMUNITY-BASED PREVALENCE PROFILE OF ARBOVIRAL, RICKETTSIAL, AND HANTAAN-LIKE VIRAL ANTIBODY IN THE NILE RIVER DELTA OF EGYPT SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID RIFT-VALLEY FEVER; SEROPREVALENCE; INFECTION; VIRUSES; NAPLES AB To determine the current prevalence of antibody to arboviruses, rickettsiae, and hantaan-like viruses, a survey was carried out in the Nile River Valley of Egypt, one of the principal foci of the 1977-1978 Rift Valley fever (RVF) outbreak. Blood specimens were obtained from 915 persons representing 190 study households. Enzyme immunoassay testing showed that the overall prevalence of IgG antibody was 4% to sand fly fever Sicilian (SFS), 2% to sandfly fever Naples (SFN), 15% to RVF, 20% to West Nile, and 4% to Hantaan (HTN) viruses. Antibody was demonstrated among 32% of the same study subjects to Coxiella burnetii, 58% to Rickettsia typhi, and 32% to R. conorii. The prevalence of agent-specific antibody tended to increase with age. Particularly notable was the low prevalence of RVF infection in children born after the height of the RVF outbreak. No detectable antibodies were found in the population less than seven years of age and in only 3% of those 7-12 years old. In contrast, 26% of the study population 13-19 years old, who were young children and infants at the time of the outbreak, were found to have RVF antibodies, suggesting that the level of intensity associated with transmission decreased considerably following the documented 1977-1978 outbreak. Geometric mean titers (GMT) ranged from 139 for C burnetii to 1,305 for RVF, and did not vary significantly by age, except for high titers for RVF in the 20-49-year-old age group. A significant upward trend in GMT was also noted when antibody was detected in the specimen for more than one phlebovirus. This was observed for SFS, SFN, and RVF, i.e., 1,172 for RVF only, 1,334 for RVF and SFN, 1,828 for RVF with SFS, and 2,1 11 for RVF with SFN and SFS (P < 0.05). These figures attest to the boosting phenomenon found when antibody for one phlebovirus is found in association with others. These findings show prevalences of rickettsial antibodies and warrant further study of disease incidence associated with acquired infection. Additionally, familial clustering of infected cases in households was evident only for C burnetii, R. typhi, and R. conorii, and was independent of sex. C1 KOREA UNIV,INST VIRAL DIS,SEOUL,SOUTH KOREA. YALE UNIV,ARBOVIRUS RES UNIT,NEW HAVEN,CT 06510. MINIST HLTH CAIRO,CTR FIELD APPL RES,CAIRO,EGYPT. RP CORWIN, A (reprint author), USN,MED RES UNIT 3,RES PUBLICAT BRANCH,PSC 452 BOX 5000,AE 09835-0007,CAIRO,EGYPT. NR 27 TC 29 Z9 30 U1 0 U2 0 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DRIVE SUITE 130, MCLEAN, VA 22101 SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD JUN PY 1993 VL 48 IS 6 BP 776 EP 783 PG 8 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA LR003 UT WOS:A1993LR00300007 PM 8101432 ER PT J AU LOVE, RW AF LOVE, RW TI PEARL-HARBOR - FINAL JUDGMENT - CLAUSEN,HC, LEE,B SO AMERICAN NEPTUNE LA English DT Book Review RP LOVE, RW (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PEABODY MUSEUM PI SALEM PA E INDIA MARINE HALL, SALEM, MA 01970 SN 0003-0155 J9 AM NEPTUNE JI Am. Neptune PD SUM PY 1993 VL 53 IS 3 BP 211 EP 212 PG 2 WC History SC History GA LQ530 UT WOS:A1993LQ53000007 ER PT J AU JOHNSON, WB HAYES, D AF JOHNSON, WB HAYES, D TI CADISM - ODD MAN OUT SO AMERICAN PSYCHOLOGIST LA English DT Letter C1 SUB BAY NAVAL HOSP,SUBIC BAY,PHILIPPINES. RP JOHNSON, WB (reprint author), USN,MED CLIN,DEPT MENTAL HLTH,HONOLULU,HI, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU AMER PSYCHOLOGICAL ASSOC PI WASHINGTON PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 SN 0003-066X J9 AM PSYCHOL JI Am. Psychol. PD JUN PY 1993 VL 48 IS 6 BP 689 EP 689 PG 1 WC Psychology, Multidisciplinary SC Psychology GA LF511 UT WOS:A1993LF51100011 ER PT J AU JONES, LR AF JONES, LR TI MANAGEMENT OF BUDGETARY DECLINE IN THE DEPARTMENT-OF-DEFENSE IN RESPONSE TO THE END OF THE COLD-WAR SO ARMED FORCES & SOCIETY LA English DT Article; Proceedings Paper CT 1991 ANNUAL RESEARCH CONF OF THE ASSOC-FOR-PUBLIC-POLICY-ANALYSIS-AND-MANAGEMENT CY OCT 24, 1991 CL WASHINGTON, DC SP ASSOC PUBLIC POLICY ANAL & MANAGEMENT ID POLICY AB This study analyzes the decisions and actions of the President, Congress, and Pentagon leadership for 1989 to 1992 to reduce the defense budget for the period 1990 to 1997. The objective of this research is to indicate how the Department of Defense developed and began to execute plans for significant downsizing. Management of declining budgets by DoD is evaluated employing a framework for analysis of fiscal stress in public sector organizations. Major force structure reductions and cuts in DoD operational and capital budget accounts are analyzed. Weapons system terminations and military and civilian personnel cuts are detailed. Efforts to improve DoD efficiency through implementation of the Defense Management Report are assessed. Military base closure and realignment is reviewed. Redefinition of the base force structure in response to revised threat assessment and changes in the international security policy environment including improved East-West relations, reduced probability of conventional war, tactical and strategic nuclear disarmament, and operation Desert Storm also is addressed. RP JONES, LR (reprint author), USN,POSTGRAD SCH,DEPT ADM SCI,MONTEREY,CA 93943, USA. NR 29 TC 4 Z9 4 U1 1 U2 1 PU TRANSACTION PERIOD CONSORTIUM PI NEW BRUNSWICK PA DEPT 3091 RUTGERS-THE STATE UNIV OF NJ, NEW BRUNSWICK, NJ 08903 SN 0095-327X J9 ARMED FORCES SOC JI Armed Forces Soc. PD SUM PY 1993 VL 19 IS 4 BP 479 EP 509 DI 10.1177/0095327X9301900402 PG 31 WC Political Science; Sociology SC Government & Law; Sociology GA LW865 UT WOS:A1993LW86500001 ER PT J AU GORMAN, L THOMAS, GW AF GORMAN, L THOMAS, GW TI GENERAL INTELLECTUAL ACHIEVEMENT, ENLISTMENT INTENTIONS, AND RACIAL REPRESENTATIVENESS IN THE UNITED-STATES MILITARY SO ARMED FORCES & SOCIETY LA English DT Article AB Debates about the racial representativeness of the U.S. military often fail to consider whether the racial composition of those who want to join the military reflects that of the general population. Using a sample of young men from the National Longitudinal Survey of Youth, this article examines the effects of four different specifications of the independent variables race, poverty status, high school enrollment, age, and test score on an individual's enlistment intentions. The coefficient estimates were maximum likelihood estimates of a logistic regression model with an ordinal dependent variable. The results suggest that enlistment intentions depend heavily on intellectual achievement and poverty as well as race, and that models ignoring this may attribute false importance to the effects of race on intentions to enlist. C1 USN,POSTGRAD SCH,DEPT ADM SCI,MONTEREY,CA 93940. NR 22 TC 7 Z9 7 U1 0 U2 1 PU TRANSACTION PERIOD CONSORTIUM PI NEW BRUNSWICK PA DEPT 3091 RUTGERS-THE STATE UNIV OF NJ, NEW BRUNSWICK, NJ 08903 SN 0095-327X J9 ARMED FORCES SOC JI Armed Forces Soc. PD SUM PY 1993 VL 19 IS 4 BP 611 EP 624 DI 10.1177/0095327X9301900408 PG 14 WC Political Science; Sociology SC Government & Law; Sociology GA LW865 UT WOS:A1993LW86500007 ER PT J AU MORIN, WD STEADMAN, JR AF MORIN, WD STEADMAN, JR TI ARTHROSCOPIC ASSESSMENT OF THE POSTERIOR COMPARTMENTS OF THE KNEE VIA THE INTERCONDYLAR NOTCH - THE ARTHROSCOPISTS FIELD OF VIEW SO ARTHROSCOPY LA English DT Article DE POSTERIOR COMPARTMENTS; FIELD OF VIEW AB This study was undertaken to assess the adequacy of visualization, limits of arthroscopic field of view (FOV), and potential ''blind spots'' at the periphery of the meniscocapsular junction using standard arthroscopic instrumentation. Five human cadaveric knees were assessed arthroscopically via standard anteromedial and anterolateral portals. Access to the posterior compartments was obtained via the intercondylar notch. FOV was maximized with first a 30-degrees and then a 70-degrees arthroscope, and the farthest point of visualization was marked with a holmium:yttrium-aluminum-garnet (YAG) laser. FOV was calculated as a percentage of the total meniscocapsular periphery. For the lateral compartment, FOV averaged 100.2% with the 30-degrees versus 116.6% with the 70-degrees arthroscope. In all knees, the entire periphery of the lateral meniscocapsular junction could be visualized with the 30-degrees arthroscope anteriorly combined with the 70-degrees arthroscope posteriorly. Medially, FOV averaged 68.9% with a 30-degrees and 88.1% with a 70-degrees arthroscope. A ''blind spot'' was present in all knees, averaging 21.5% of the meniscocapsular periphery with a 30-degrees arthroscope anteriorly and a 70-degrees arthroscope posteriorly. Key Words: Posterior compartments-Field of view. C1 USN HOSP,DEPT ORTHOPAED SURG,SAN DIEGO,CA 92134. NR 0 TC 26 Z9 27 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0749-8063 J9 ARTHROSCOPY JI Arthroscopy PD JUN PY 1993 VL 9 IS 3 BP 284 EP 290 DI 10.1016/S0749-8063(05)80423-2 PG 7 WC Orthopedics; Surgery SC Orthopedics; Surgery GA LD774 UT WOS:A1993LD77400005 PM 8323613 ER PT J AU WIIK, JE DERE, K SCHMIEDER, B AF WIIK, JE DERE, K SCHMIEDER, B TI UV PROMINENCES OBSERVED WITH THE HRTS - STRUCTURE AND PHYSICAL-PROPERTIES SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE SUN, PROMINENCES; SUN, CORONA; SUN, UV PROMINENCES ID SOLAR TRANSITION ZONE; FINE-STRUCTURE; H-ALPHA; QUIESCENT PROMINENCES; QUIET SUN; FILAMENTS; DYNAMICS; FLOWS; IV AB Ultraviolet spectra of two quiescent prominences (PL1, PL2) observed with the High Resolution Telescope and Spectrograph (HRTS) are described and analyzed. Meudon synoptic maps and spectroheliograms indicate that prominence PL1 was extremely active during the flight and that material ejections were likely. PL2 appeared to be a more stable prominence. The significant differences between the spectra of the two prominences can perhaps be explained by their levels of activity. The spectrum of the more active prominence PL1 is dominated by transition zone lines formed near 10(5) K whereas the second prominence PL2 shows considerable emission of cooler chromospheric lines formed near 2 x 10(4) K. PL1 also exhibits larger bulk flow velocities (up to approximately 30 km s-1) and non-thermal velocities ( approximately 20 km s-1). From line ratios (OIV, NV, NIV, SiIV) a relatively large electron density (approximately 10(11) cm-3) is derived for the PL1 prominence transition region (PTR). In comparison, PL2 is a relatively quiet prominence with bulk flow velocities generally less than approximately 3 km s-1. Different techniques yield greatly different spatial scales for the prominence. The UV spectra show strong variations in intensity and Doppler shift on scales of about 1700 km. The combined density and emission measures indicate path lengths of 400 m or less. The optical depth in CIV requires path lengths of 40 km or less. If, as suggested by these analyses, it is assumed that prominence emission is due to a number of micro-structures with a Gaussian velocity distribution, then spatial scales of the micro-structures of a few hundred kilometers are found. C1 USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. RP WIIK, JE (reprint author), OBSERV PARIS, SECT MEUDON, DASOP, F-92195 MEUDON, FRANCE. NR 43 TC 24 Z9 24 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD JUN PY 1993 VL 273 IS 1 BP 267 EP 286 PG 20 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LF973 UT WOS:A1993LF97300037 ER PT J AU CLEGG, AW FIEDLER, RL CORDES, JM AF CLEGG, AW FIEDLER, RL CORDES, JM TI DISCONTINUITIES IN THE DYNAMIC SPECTRUM OF THE PULSAR 0823+26 SO ASTROPHYSICAL JOURNAL LA English DT Article DE ISM, GENERAL; PULSARS, INDIVIDUAL (PSR-0823+26) ID INTERSTELLAR-MEDIUM; PLASMA AB The 1400 MHz dynamic spectrum of the pulsar 0823 + 26 exhibits sharp discontinuities which are characterized by changes in the diffractive scintillation pattern over transition times of less-than-or-similar-to 2 minutes. The discontinuities occur during periods in which the pulsar's broad-band (40 MHz) light curve is undergoing strong oscillations with periods of approximately 15 minutes. We believe these effects are due to coherent interference between multiple images created by strong refraction in the interstellar medium. In effect, we observe the discontinuities in the dynamic spectrum when the scintillation patterns of different images (each traveling different optical paths) alternately dominate the received intensity. The light curve oscillations are caused by coherent interference between the various images over bandwidths greater than the observing bandwidth. Based on the time scale for the oscillations at 1400 MHz, we derive a characteristic angular offset between images of approximately 0.5 mas. We cannot determine if the strong refraction is a consequence of the statistical nature of the medium along this line-of-sight, or whether a discrete refractor (i.e., an interstellar lens) is responsible. If the refractor is a discrete object, its dimension transverse to the line-of-sight is greater-than-or-similar-to 0.19f AU and its electron column density is greater-than-or-equal-to 1.2 x 10(-4)f cm - 3 pc, where f is the fractional distance of the refractor along the line-of-sight to the pulsar. Its electron number density is approximately 123/eta cm-3, where eta is the elongation of the refractor along the line-of-sight relative to its transverse dimension. The pulsar 0823 + 26 is a promising candidate for interstellar interferometry since it apparently undergoes extended periods of multiple imaging. C1 CORNELL UNIV,DEPT ASTRON,ITHACA,NY 14853. RP CLEGG, AW (reprint author), USN,RES LAB,CODE 7210,WASHINGTON,DC 20375, USA. NR 14 TC 10 Z9 10 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 JUN 1 PY 1993 VL 409 IS 2 BP 691 EP 696 DI 10.1086/172698 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LC832 UT WOS:A1993LC83200018 ER PT J AU BEIERSDORFER, P PHILLIPS, T JACOBS, VL HILL, KW BITTER, M VONGOELER, S AF BEIERSDORFER, P PHILLIPS, T JACOBS, VL HILL, KW BITTER, M VONGOELER, S TI HIGH-RESOLUTION MEASUREMENTS, LINE IDENTIFICATION, AND SPECTRAL MODELING OF K-ALPHA TRANSITIONS IN FE-XVIII-FE-XXV SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC DATA; ATOMIC PROCESSES; X-RAYS, GENERAL ID X-RAY-SPECTRA; INNER-SHELL TRANSITIONS; DIELECTRONIC SATELLITE SPECTRA; SOLAR-FLARES; CRYSTAL SPECTROMETER; LABORATORY PLASMAS; ION TEMPERATURE; RESONANCE LINE; IRON; TOKAMAKS AB A detailed analysis of the iron Kalpha emission spectrum covering the wavelength region from 1.840 to 1.9 angstrom is presented. Measurements are made with a high-resolution Bragg crystal spectrometer on the Princeton Large Torus (PLT) tokamak for plasma conditions which closely resemble those of solar flares. A total of 40 features are identified, consisting of either single or multiple lines from eight charge states in iron, Fe XVIII-Fe XXV, and their wavelengths are determined with an accuracy of 0.1-0.4 mangstrom. Many of these features are identified for the first time. In the interpretation of our observations we rely on model calculations that determine the ionic species abundances from electron density and temperature profiles measured indePendently with nonspectroscopic techniques and that incorporate theoretical collisional excitation and dielectronic recombination rates resulting in the excitation of the ls2s(r)2p(s) configurations. The model calculations also include the effect of diffusive ion transport. Good overall agreement between the model calculations and the observations is obtained, which gives us confidence in our line identifications and spectral modeling capabilities. The results are compared with earlier analyses of the Kalpha emission from the Sun. While many similarities are found, a few differences arise from the somewhat higher electron density in tokamak plasmas (10(13) cm-3), which affects the fine-structure level populations of the ground states of the initial ion undergoing electron-impact excitation or dielectronic recombination. We also find that several spectral features are comprised of different transitions from those reported in earlier analyses of solar data. C1 USN,RES LAB,DIV CONDENSED MATTER & RADIAT SCI,WASHINGTON,DC 20375. PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. UNIV CALIF BERKELEY,DEPT PHYS & ASTRON,BERKELEY,CA 94720. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. RP BEIERSDORFER, P (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 51 TC 65 Z9 66 U1 0 U2 3 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUN 1 PY 1993 VL 409 IS 2 BP 846 EP 859 DI 10.1086/172715 PN 1 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LC832 UT WOS:A1993LC83200035 ER PT J AU EKBERG, JO FELDMAN, U AF EKBERG, JO FELDMAN, U TI ATOMIC TRANSITION-PROBABILITIES OF FE-II LINES DETERMINED FROM SOLAR EMISSION-SPECTRA .1. THE 2000-2800-ANGSTROM WAVELENGTH RANGE SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article DE ATOMIC DATA; SUN, UV RADIATION; ULTRAVIOLET, SOLAR SYSTEM ID OSCILLATOR-STRENGTHS; RADIATIVE LIFETIMES; QUIET SUN; LIMB; NM AB Intensities of Fe II lines were measured at a number of positions above the white light limb of the quiet Sun, using photographic spectra obtained by the Naval Research Laboratory (NRL) normal incidence spectrometer on Skylab. With the aid of experimental spontaneous decay rates previously published in the scientific literature we have calculated the spontaneous decay rates of over 550 Fe II transitions in the 2000-2800 angstrom wavelength range. Two-hundred twenty of the measured spontaneous decay rates are published for the first time. It was determined that the Fe II levels in the solar chromosphere achieve a Boltzmann population corresponding to a almost-equal-to 0.78 eV temperature. The accuracy of the new rates is comparable to the accuracy of the previously published experimental rates. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP EKBERG, JO (reprint author), LUND UNIV,DEPT PHYS,SOLVEGATEN 14,S-22362 LUND,SWEDEN. NR 26 TC 9 Z9 9 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0067-0049 J9 ASTROPHYS J SUPPL S JI Astrophys. J. Suppl. Ser. PD JUN PY 1993 VL 86 IS 2 BP 611 EP 628 DI 10.1086/191792 PG 18 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LD674 UT WOS:A1993LD67400011 ER PT J AU JOHNSON, WN KINZER, RL KURFESS, JD STRICKMAN, MS PURCELL, WR GRABELSKY, DA ULMER, MP HILLIS, DA JUNG, GV CAMERON, RA AF JOHNSON, WN KINZER, RL KURFESS, JD STRICKMAN, MS PURCELL, WR GRABELSKY, DA ULMER, MP HILLIS, DA JUNG, GV CAMERON, RA TI THE ORIENTED SCINTILLATION SPECTROMETER EXPERIMENT - INSTRUMENT DESCRIPTION SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article DE ARTIFICIAL SATELLITES, SPACE PROBES; GAMMA-RAYS, OBSERVATIONS; INSTRUMENTATION, DETECTORS; INSTRUMENTATION, SPECTROGRAPHS AB The Oriented Scintillation Spectrometer Experiment (OSSE) on the Arthur Holly Compton Gamma Ray Observatory satellite uses four actively shielded NaI(Tl)-CsI(Na) phoswich detectors to provide gamma-ray line and continuum detection capability. in the 0.05-10 MeV energy range. The instrument includes secondary capabilities for gamma-ray and neutron detection between 10 and 250 MeV. The detectors have 3.8-degrees x 11.4-degrees (FWHM) fields of view defined by tungsten collimators. Each detector has an independent, single-axis orientation system which permits offset pointing from the spacecraft Z-axis for background measurements and multitarget observations. The instrument, and its calibration and performance, are described. C1 NORTHWESTERN UNIV,EVANSTON,IL 60208. BALL AEROSP SYST GRP,BOULDER,CO 80306. UNIV WASHINGTON,SPACE RES ASSOC,WASHINGTON,DC 20024. RP JOHNSON, WN (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. RI Johnson, Neil/G-3309-2014 NR 10 TC 157 Z9 157 U1 1 U2 3 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0067-0049 J9 ASTROPHYS J SUPPL S JI Astrophys. J. Suppl. Ser. PD JUN PY 1993 VL 86 IS 2 BP 693 EP 712 DI 10.1086/191795 PG 20 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LD674 UT WOS:A1993LD67400014 ER PT J AU ROWLEY, DA KELLEY, WA MANDERS, JH AF ROWLEY, DA KELLEY, WA MANDERS, JH TI FLOW CYTOMETRIC ANALYSIS OF LYMPHOCYTE SURFACE-MARKERS FOLLOWING A 1-GY DOSE OF GAMMA-RADIATION SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article AB Flow cytometric analysis of lymphocytes labeled with monoclonal antibodies was undertaken in order to compare the mean fluorescent intensity of several surface membrane antigens (markers) from irradiated and nonirradiated blood samples. Whole blood subjected to a 1-Gy (100-rad) dose of 1.25 MeV gamma radiation from a Co-60 radioisotope source was compared with nonirradiated blood drawn simultaneously from the same healthy subject. Twenty runs were performed in which the following T and B lymphocyte and natural killer surface markers were analyzed: CD2, CD3, 13, CD4, CD29, CD45RA, CD8, CD56, and CD19. The data demonstrate a radiation-induced decrement in the mean fluorescent intensity of the high molecular weight markers CD45RA and CD56 (decrement is -3.3% and -7.2%, respectively). The statistical validity of these values was confirmed using paired t-tests, which yielded p values of p < 0.02 (CD45RA) and p < 0.01 (CD56). The fluorescent intensity is proportional to the number of intact binding sites on the lymphocyte surface and the observed decrement directly infers that damage to some sites occurred. These results illustrate a measurable effect on the lymphocyte membrane at a radiation dose at which many lymphocytes will survive, yet may be immunologically altered. This study may have important implications for personnel exposed to ionizing radiation, such as astronauts on long duration missions and radiation workers involved in accidental exposures. RP ROWLEY, DA (reprint author), USN HOSP,DEPT LAB MED,PORTSMOUTH,VA 23708, USA. NR 17 TC 10 Z9 10 U1 0 U2 0 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD JUN PY 1993 VL 64 IS 6 BP 528 EP 533 PG 6 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA LE075 UT WOS:A1993LE07500008 PM 8338500 ER PT J AU MITTELMAN, MH SIEGEL, B STILL, DL AF MITTELMAN, MH SIEGEL, B STILL, DL TI CONTACT-LENSES IN AVIATION - THE MARINE CORPS EXPERIENCE SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article AB In an attempt to limit safety and health risks, Naval Aeromedical Policy has historically prohibited the use of contact lenses in the Navy and Marine Corps Class 1 Aviation Personnel (pilots), approximately 18% of whom require spectacles. Recent technological advancements have rendered spectacles functionally incompatible with some mission-essential masks, goggles, and imaging devices, thus forcing a re-examination of existing policy. Recent U.S. Army and U.S. Air Force aviation studies favorably compare the performance of contact lenses to spectacles. In order to test the application of contact lenses in the unique U.S. Marine Corps aviation environment, encompassing shipboard, land-based, and forwardly-deployed units, 90 aviation personnel assigned to several deploying squadrons were evaluated for contact lenses; flex-wear disposable lenses were the primary modality of choice. Of the subjects, 68 (73%) were successfully fit and continued contact lens wear for a period of 16 months. Safety and health were not compromised, and job performance was favorably affected. No cases of ulcerative keratitis or vision loss were reported. The first U.S. Marine Corps aviation contact lens study supports the growing belief that contact lenses can be safely and effectively applied in the critical and hazardous aviation environment. C1 USN,INST AEROSP MED,PENSACOLA,FL. NR 5 TC 3 Z9 4 U1 0 U2 0 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD JUN PY 1993 VL 64 IS 6 BP 538 EP 540 PG 3 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA LE075 UT WOS:A1993LE07500010 PM 8338502 ER PT J AU ECHEVERRIA, P SAVARINO, SJ YAMAMOTO, T AF ECHEVERRIA, P SAVARINO, SJ YAMAMOTO, T TI ESCHERICHIA-COLI DIARRHEA SO BAILLIERES CLINICAL GASTROENTEROLOGY LA English DT Article ID EPEC ADHERENCE-FACTOR; HEAT-STABLE ENTEROTOXIN; PUTATIVE COLONIZATION FACTOR; LINKED IMMUNOSORBENT-ASSAY; POLYMERASE CHAIN-REACTION; HEP-2 CELLS; DNA PROBE; PERSISTENT DIARRHEA; LOCALIZED ADHERENCE; INFANTILE DIARRHEA C1 USN,MED RES INST,ROCKVILLE,MD 20852. JUNTENDO UNIV,SCH MED,DEPT BACTERIOL,BUNKYO KU,TOKYO 113,JAPAN. RP ECHEVERRIA, P (reprint author), USA,MED COMPONENT,ARMED FORCES RES INST MED SCI,RAJVITHI RD,BANGKOK 10400,THAILAND. NR 99 TC 4 Z9 4 U1 0 U2 0 PU BAILLIERE TINDALL PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0950-3528 J9 BAILLIERE CLIN GASTR JI Baillieres Clin. Gastroenterol. PD JUN PY 1993 VL 7 IS 2 BP 243 EP 262 DI 10.1016/0950-3528(93)90042-Q PG 20 WC Gastroenterology & Hepatology SC Gastroenterology & Hepatology GA LT108 UT WOS:A1993LT10800004 PM 8364243 ER PT J AU MILLAR, DB THOMAS, JR PACHECO, ND ROLLWAGEN, FM AF MILLAR, DB THOMAS, JR PACHECO, ND ROLLWAGEN, FM TI NATURAL-KILLER-CELL CYTOTOXICITY AND T-CELL PROLIFERATION IS ENHANCED BY AVOIDANCE-BEHAVIOR SO BRAIN BEHAVIOR AND IMMUNITY LA English DT Article ID LYMPHOCYTE-PROLIFERATION; IMMUNE-RESPONSE; INDUCED MODULATION; PERIPHERAL-BLOOD; BETA-ENDORPHIN; TUMOR-GROWTH; STRESS; SYSTEM; RATS; SUPPRESSION C1 NIMH,CTR NEUROSCI,NEUROPSYCHIAT BRANCH,WASHINGTON,DC 20032. USN,MED RES INST,ENTER DIS PROGRAM,BETHESDA,MD 20889. RP MILLAR, DB (reprint author), USN,MED RES INST,THERMAL STRESS PROGRAM,MS-11,BETHESDA,MD 20889, USA. NR 48 TC 23 Z9 23 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 0889-1591 J9 BRAIN BEHAV IMMUN JI Brain Behav. Immun. PD JUN PY 1993 VL 7 IS 2 BP 144 EP 153 DI 10.1006/brbi.1993.1016 PG 10 WC Immunology; Neurosciences SC Immunology; Neurosciences & Neurology GA LJ034 UT WOS:A1993LJ03400004 PM 8347896 ER PT J AU TUCKER, KJ WILSON, C AF TUCKER, KJ WILSON, C TI A COMPARISON OF TRANSESOPHAGEAL ATRIAL-PACING AND DIRECT-CURRENT CARDIOVERSION FOR THE TERMINATION OF ATRIAL-FLUTTER - A PROSPECTIVE, RANDOMIZED CLINICAL-TRIAL SO BRITISH HEART JOURNAL LA English DT Article ID OPEN-HEART SURGERY; PILL ELECTRODE; INTERRUPTION AB Objective-To compare the safety and efficacy of transoesophageal atrial pacing (TAP) with an easily swallowed pill electrode and direct current cardioversion (DCC) in patients with atrial flutter that was refractory to appropriate medical treatment. Design-Prospective, randomised clinical trial. Setting-Community based United States naval hospital. Subjects-Twenty one consecutive patients with refractory atrial flutter selected consecutively from the inpatient cardiology consultation service. All patients were haemodynamically stable and medical treatment with a class IA or IC antiarrhythmic agent had failed. Eleven patients were treated with TAP and 10 patients were treated with DCC. Interventions-Digoxin was given to all patients to control the ventricular rate to <100/minute. Main outcome measure-Conversion to normal sinus rhythm and arrhythmias after cardioversion. Results-Conversion to normal sinus rhythm was similar in both groups (TAP 8/11, DCC 9/10, p = 0.31). Arrhythmias after cardioversion including third degree heart block and non-sustained ventricular tachycardia were more frequent in the DCC group (TAP 0/11, DCC 6/10, p = 0.02). Conclusion-Transoesophageal atrial pacing with an easily swallowed pill electrode is safe, well tolerated, and is as efficacious as DCC for refractory atrial flutter. C1 USN HOSP,DEPT MED,DIV CARDIOL,OAKLAND,CA. NR 25 TC 16 Z9 16 U1 0 U2 0 PU BRITISH MED JOURNAL PUBL GROUP PI LONDON PA BRITISH MED ASSOC HOUSE, TAVISTOCK SQUARE, LONDON, ENGLAND WC1H 9JR SN 0007-0769 J9 BRIT HEART J JI Br. Heart J. PD JUN PY 1993 VL 69 IS 6 BP 530 EP 535 PG 6 WC Cardiac & Cardiovascular Systems; History & Philosophy Of Science SC Cardiovascular System & Cardiology; History & Philosophy of Science GA LG264 UT WOS:A1993LG26400015 PM 8343321 ER PT J AU CASTRODEMOUX, ME AF CASTRODEMOUX, ME TI TYPES OF THEATER DISCOURSE IN THE 'ENTREMES DE LOS NEGROS' BY AGUADO,SIMON SO BULLETIN OF THE COMEDIANTES LA Spanish DT Article RP CASTRODEMOUX, ME (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 20 TC 0 Z9 0 U1 0 U2 0 PU AUBURN UNIV PI AUBURN PA DEPT FOREIGN LANGUAGES, AUBURN, AL 36849 SN 0007-5108 J9 B COMEDIANTES JI Bull. Comed. PD SUM PY 1993 VL 45 IS 1 BP 53 EP 66 PG 14 WC Theater SC Theater GA MY896 UT WOS:A1993MY89600005 ER PT J AU KOPECSMYTH, K DESCHAMPS, JR LOOMIS, LD WARD, KB AF KOPECSMYTH, K DESCHAMPS, JR LOOMIS, LD WARD, KB TI A PARTIAL PRIMARY STRUCTURE OF SQUID HEPATOPANCREAS ORGANOPHOSPHORUS ACID ANHYDROLASE SO CHEMICO-BIOLOGICAL INTERACTIONS LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL MEETING ON ESTERASES INTERACTING WITH ORGANOPHOSPHORUS COMPOUNDS CY APR 21-24, 1992 CL SALSOMAGGIORE, ITALY DE SQUID HEPATOPANCREAS; ORGANOPHOSPHORUS ACID ANHYDROLASE; PRIMARY STRUCTURE; MOLECULAR WEIGHT AB Earlier studies of OPA anhydrolase from the squid, Loligo pealei, report that the enzyme has a molecular weight near 26 kDa, despite the common observation that SDS-PAGE experiments do not support this conclusion. Recent results from protein sequencing and cloning experiments now suggest that the enzyme found in squid hepatopancreas has a molecular weight of about 42 kDa. The enzyme easily degrades into two fragments of 16 kDa and approximately 26 kDa. N-terminal sequence analyses of the intact enzyme and the 16 kDa fragment blotted from an SDS gel and sequenced from the blot have shown conclusively that the intact 42 kDa protein has a blocked N-terminus. Sequence data obtained previously are from the N-terminal portion of the 16 kDa fragment. Additional support for this interpretation has been obtained from PCR analysis of L. pealei mRNA an cDNA. The partial (30 residue) sequence presented here reveals no indication of similarity to any other OPA anhydrolase or aryldialkylphosphatase (EC 3.1.8.1). C1 USN,RES LAB,CODE 6030,WASHINGTON,DC 20375. JACKSON FDN,ROCKVILLE,MD 20850. OI Deschamps, Jeffrey/0000-0001-5845-0010 NR 10 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0009-2797 J9 CHEM-BIOL INTERACT JI Chem.-Biol. Interact. PD JUN PY 1993 VL 87 IS 1-3 BP 49 EP 54 DI 10.1016/0009-2797(93)90024-S PG 6 WC Biochemistry & Molecular Biology; Pharmacology & Pharmacy; Toxicology SC Biochemistry & Molecular Biology; Pharmacology & Pharmacy; Toxicology GA LP303 UT WOS:A1993LP30300008 PM 8393747 ER PT J AU WALDRON, A AF WALDRON, A TI THE INNER OPIUM WAR - POLACHEK,JH SO CHINA QUARTERLY LA English DT Book Review C1 BROWN UNIV, PROVIDENCE, RI 02912 USA. RP WALDRON, A (reprint author), USN, WAR COLL, WASHINGTON, DC 20350 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0305-7410 J9 CHINA QUART JI China Q. PD JUN PY 1993 IS 134 BP 358 EP 359 PG 2 WC Area Studies SC Area Studies GA LZ097 UT WOS:A1993LZ09700009 ER PT J AU MATHISEN, GE WEISS, PJ KENNEDY, CA AF MATHISEN, GE WEISS, PJ KENNEDY, CA TI PNEUMONIA, ASEPTIC-MENINGITIS, AND LEUKOPENIA IN A 28-YEAR-OLD MAN SO CLINICAL INFECTIOUS DISEASES LA English DT Discussion ID HUMAN EHRLICHIOSIS; HUMAN INFECTION C1 VET ADM MED CTR,INFECT DIS SECT,SEPULVEDA,CA 91343. USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134. NR 13 TC 11 Z9 11 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 1058-4838 J9 CLIN INFECT DIS JI Clin. Infect. Dis. PD JUN PY 1993 VL 16 IS 6 BP 809 EP 815 PG 7 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA LE423 UT WOS:A1993LE42300013 PM 8329513 ER PT J AU BROOK, I AF BROOK, I TI PROPHYLAXIS OF AND THERAPY FOR POLYMICROBIAL INFECTION IN MICE WITH CEFOXITIN, CEFOTETAN, AND CEFMETAZOLE SO CLINICAL INFECTIOUS DISEASES LA English DT Article; Proceedings Paper CT 1ST NORTH AMERICAN CONGRESS ON ANAEROBIC BACTERIA AND ANAEROBIC INFECTIONS CY JUL 24-26, 1992 CL MARINA DEL REY, CA SP ABBOTT LABS ID BACTEROIDES-FRAGILIS GROUP; UNITED-STATES; SUSCEPTIBILITY C1 USN,MED RES INST,BETHESDA,MD 20814. NR 5 TC 1 Z9 1 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 1058-4838 J9 CLIN INFECT DIS JI Clin. Infect. Dis. PD JUN PY 1993 VL 16 SU 4 BP S425 EP S426 PG 2 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA LE919 UT WOS:A1993LE91900061 PM 8324161 ER PT J AU ROSENBLATT, JE BROOK, I AF ROSENBLATT, JE BROOK, I TI CLINICAL RELEVANCE OF SUSCEPTIBILITY TESTING OF ANAEROBIC-BACTERIA SO CLINICAL INFECTIOUS DISEASES LA English DT Article; Proceedings Paper CT 1ST NORTH AMERICAN CONGRESS ON ANAEROBIC BACTERIA AND ANAEROBIC INFECTIONS CY JUL 24-26, 1992 CL MARINA DEL REY, CA SP ABBOTT LABS ID BACTEROIDES-FRAGILIS GROUP C1 USN,MED RES INST,BETHESDA,MD 20814. ARMED FORCES RADIOBIOL RES INST,BETHESDA,MD 20814. RP ROSENBLATT, JE (reprint author), MAYO CLIN & MAYO FDN,CLIN MICROBIOL SECT,HILTON 470,ROCHESTER,MN 55905, USA. NR 11 TC 24 Z9 24 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 1058-4838 J9 CLIN INFECT DIS JI Clin. Infect. Dis. PD JUN PY 1993 VL 16 SU 4 BP S446 EP S448 PG 3 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA LE919 UT WOS:A1993LE91900066 PM 8324166 ER PT J AU HOFFMAN, DL HOWARD, JR SARMA, R RIGGS, JE AF HOFFMAN, DL HOWARD, JR SARMA, R RIGGS, JE TI ENCEPHALOPATHY, MYELOPATHY, OPTIC NEUROPATHY, AND ANOSMIA ASSOCIATED WITH INTRAVENOUS CYTOSINE-ARABINOSIDE SO CLINICAL NEUROPHARMACOLOGY LA English DT Note DE HIGH-DOSE CYTOSINE ARABINOSIDE; ANOSMIA; NEUROTOXICITY; OPTIC NEUROPATHY ID DOSE ARA-C; NERVOUS-SYSTEM TOXICITY; NEUROTOXICITY AB Coma, hemiparesis, unilateral optic neuropathy, and anosmia manifested in a patient with leukemia after he received only three courses of intravenous high-dose cytosine arabinoside (ARA-C). The patient's mental status returned to normal after several days, and his hemiparesis resolved. However, the visual loss persisted, and near complete visual loss in the other eye ensued over the following month. Severe bilateral optic atrophy appeared as the visual loss progressed. Anosmia became evident after resolution of the coma and did not improve. The patient had previously had a thoracic myelopathy 2 weeks after receiving low-dose i.v. ARA-C. The neurotoxicity of high-dose i.v. ARA-C may arise at much lower cumulative doses than has been reported. In addition to cerebellar dysfunction and somnolence, high-dose i.v. ARA-C may produce optic neuropathy, anosmia, and hemiparesis. C1 USN HOSP,DEPT NEUROL,PORTSMOUTH,VA. UNS HOSP,DEPT HEMATOL ONCOL,PORTSMOUTH,VA. VET ADM MED CTR,DEPT HEMATOL,DECATUR,GA. W VIRGINIA UNIV,DEPT NEUROL,MORGANTOWN,WV 26506. NR 9 TC 11 Z9 11 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0362-5664 J9 CLIN NEUROPHARMACOL JI Clin. Neuropharmacol. PD JUN PY 1993 VL 16 IS 3 BP 258 EP 262 DI 10.1097/00002826-199306000-00010 PG 5 WC Clinical Neurology; Pharmacology & Pharmacy SC Neurosciences & Neurology; Pharmacology & Pharmacy GA LC343 UT WOS:A1993LC34300010 PM 8504443 ER PT J AU BURR, RG PALINKAS, LA BANTA, GR AF BURR, RG PALINKAS, LA BANTA, GR TI PSYCHOLOGICAL EFFECTS OF SUSTAINED SHIPBOARD OPERATIONS ON UNITED-STATES-NAVY PERSONNEL SO CURRENT PSYCHOLOGY LA English DT Article ID STRESS; WORK; WAR AB This study investigated the psychological and physical health status of 265 crew members on two U.S. Navy ships (a guided missile cruiser and a frigate on convoy escort duty for tankers under U.S. flag) during the Persian Gulf conflict at four time periods during combat-ready operations on a single day. Findings suggest that adaptation occurs to extreme stressors associated with sustained operations. Suggestions are made relative to measures that may minimize psychological and physical conditions that adversely affect performance under conditions of heavy stress. RP BURR, RG (reprint author), USN,HLTH RES CTR,POB 85122,SAN DIEGO,CA 92186, USA. NR 37 TC 1 Z9 1 U1 0 U2 0 PU TRANSACTION PERIOD CONSORTIUM PI NEW BRUNSWICK PA DEPT 3091 RUTGERS-THE STATE UNIV OF NJ, NEW BRUNSWICK, NJ 08903 SN 0737-8262 J9 CURR PSYCHOL JI Curr. Psychol. PD SUM PY 1993 VL 12 IS 2 BP 113 EP 129 DI 10.1007/BF02686817 PG 17 WC Psychology, Multidisciplinary SC Psychology GA LU787 UT WOS:A1993LU78700002 ER PT J AU MUNZIG, NC AF MUNZIG, NC TI INFECTION-CONTROL IS NO LAUGHING MATTER SO DIALYSIS & TRANSPLANTATION LA English DT Article RP MUNZIG, NC (reprint author), USN HOSP,DEPT INTERNAL MED,DIV NEPHROL,SAN DIEGO,CA 92134, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU CREATIVE AGE PUBL PI VAN NUYS PA 7628 DENSMORE AVE, VAN NUYS, CA 91406-2088 SN 0090-2934 J9 DIALYSIS TRANSPLANT JI Dial. Transplant. PD JUN PY 1993 VL 22 IS 6 BP 341 EP 342 PG 2 WC Engineering, Biomedical; Transplantation; Urology & Nephrology SC Engineering; Transplantation; Urology & Nephrology GA LZ276 UT WOS:A1993LZ27600011 ER PT J AU BLANK, DA WU, C AF BLANK, DA WU, C TI THE EFFECT OF COMBUSTION ON A POWER OPTIMIZED ENDOREVERSIBLE DIESEL CYCLE SO ENERGY CONVERSION AND MANAGEMENT LA English DT Article DE DIESEL ENGINE; COMBUSTION; ENDOREVERSIBLE AB The power potential of an endoreversible Diesel cycle with combustion is analyzed and optimized. The endoreversible cycle is one in which the heating process by combustion and the heat removing process to the surroundings are the only irreversible processes in the cycle. A mathematical expression is derived and optimized for the power output of the cycle. This paper provides another criterion besides thermal efficiency, mean effective pressure and detonation for use in the evaluation of the performance and the suitability of a diesel engine. RP BLANK, DA (reprint author), USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402, USA. NR 0 TC 30 Z9 31 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0196-8904 J9 ENERG CONVERS MANAGE JI Energy Conv. Manag. PD JUN PY 1993 VL 34 IS 6 BP 493 EP 498 DI 10.1016/0196-8904(93)90080-T PG 6 WC Thermodynamics; Energy & Fuels; Mechanics SC Thermodynamics; Energy & Fuels; Mechanics GA KU393 UT WOS:A1993KU39300007 ER PT J AU VANORDEN, KF DIVITA, J SHIM, MJ AF VANORDEN, KF DIVITA, J SHIM, MJ TI REDUNDANT USE OF LUMINANCE AND FLASHING WITH SHAPE AND COLOR AS HIGHLIGHTING CODES IN SYMBOLIC DISPLAYS SO HUMAN FACTORS LA English DT Article ID VISUAL-SEARCH; INTEGRATION; SIMILARITY; ATTENTION; PARALLEL; FEATURES AB Three visual search experiments evaluated the benefits and distracting effects of using luminance and flashing to highlight subclasses of symbols coded by shape and color. Each of three general shape/color classes (circular/blue, diamond/red, square/yellow) was divided into three subclasses by presenting the upper half, lower half, or entire symbol. Increasing the luminance of a subclass by a factor of two did not result in a significant improvement in search performance. Flashing a subclass at a rate of 3 Hz resulted in a significantly shorter mean search time (48% improvement). Increasing the luminance of one subclass (by a factor of five) while simultaneously flashing another significantly improved search times by 31% and 43% respectively, compared with nonhighlighted search conditions. In each experiment, the search times for nonhighlighted target subclasses were not affected by the presence of brighter and flashing targets. The failure of the initial experiment to find a significant performance improvement caused by increasing symbol luminance suggested that a larger luminance increase was necessary for this code to be effective. The overall results suggest that using luminance and flashing to highlight subclasses of color- and shape-coded symbols can reduce search times for these subclasses without producing a distraction effect by way of a concomitant increase in the search times for unhighlighted symbols. RP VANORDEN, KF (reprint author), USN,SUBMARINE MED RES LAB,DEPT VIS,GROTON,CT 06349, USA. NR 28 TC 13 Z9 14 U1 0 U2 2 PU HUMAN FACTORS SOC PI SANTA MONICA PA BOX 1369, SANTA MONICA, CA 90406 SN 0018-7208 J9 HUM FACTORS JI Hum. Factors PD JUN PY 1993 VL 35 IS 2 BP 195 EP 204 PG 10 WC Behavioral Sciences; Engineering, Industrial; Ergonomics; Psychology, Applied; Psychology SC Behavioral Sciences; Engineering; Psychology GA LL764 UT WOS:A1993LL76400001 PM 8349285 ER PT J AU KRAMER, AF COYNE, JT STRAYER, DL AF KRAMER, AF COYNE, JT STRAYER, DL TI COGNITIVE FUNCTION AT HIGH-ALTITUDE SO HUMAN FACTORS LA English DT Article ID ACUTE MOUNTAIN-SICKNESS; EXTREME ALTITUDES; EVEREST; EXPOSURE; AUTOMATICITY; PERFORMANCE; ATTENTION; CATEGORY; CLIMBERS; SEARCH AB The effects of altitude on human performance and cognition were evaluated in a field study performed on Mount Denali in Alaska during the summer of 1990. Climbers performed a series of perceptual, cognitive, and sensory-motor tasks before, during, and after climbing the West Buttress route on Denali. Relative to a matched control group that performed the tasks at sea level, the climbers showed deficits of learning and retention in perceptual and memory tasks. Furthermore, climbers performed more slowly on most tasks than did the control group, suggesting long-term deficits that may be attributed to repeated forays to high altitudes. C1 USN,HLTH RES CTR,SAN DIEGO,CA 92132. UNIV UTAH,SALT LAKE CITY,UT 84112. RP KRAMER, AF (reprint author), UNIV ILLINOIS,DEPT PSYCHOL,603 E DANIEL ST,CHAMPAIGN,IL 61820, USA. NR 47 TC 55 Z9 58 U1 1 U2 9 PU HUMAN FACTORS SOC PI SANTA MONICA PA BOX 1369, SANTA MONICA, CA 90406 SN 0018-7208 J9 HUM FACTORS JI Hum. Factors PD JUN PY 1993 VL 35 IS 2 BP 329 EP 344 PG 16 WC Behavioral Sciences; Engineering, Industrial; Ergonomics; Psychology, Applied; Psychology SC Behavioral Sciences; Engineering; Psychology GA LL764 UT WOS:A1993LL76400008 PM 8349291 ER PT J AU STROBEL, DF HALL, DT ZHU, X SUMMERS, ME AF STROBEL, DF HALL, DT ZHU, X SUMMERS, ME TI UPPER LIMIT ON TITANS ATMOSPHERIC ARGON ABUNDANCE SO ICARUS LA English DT Note ID FAR-ULTRAVIOLET SPECTROPHOTOMETRY; EXTREME ULTRAVIOLET; VOYAGER-1 ENCOUNTER; EUV EMISSION; OCCULTATION; STARS C1 JOHNS HOPKINS UNIV HOSP,DEPT ENVIRONM STUDIES,BALTIMORE,MD 21218. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP STROBEL, DF (reprint author), JOHNS HOPKINS UNIV HOSP,DEPT EARTH & PLANETARY SCI,BALTIMORE,MD 21218, USA. RI Zhu, Xun/C-2097-2016 OI Zhu, Xun/0000-0001-7860-6430 NR 23 TC 19 Z9 19 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 0019-1035 J9 ICARUS JI Icarus PD JUN PY 1993 VL 103 IS 2 BP 333 EP 336 DI 10.1006/icar.1993.1075 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LK928 UT WOS:A1993LK92800010 ER PT J AU KROWNE, CM AF KROWNE, CM TI WAVE-GUIDING STRUCTURES EMPLOYING THE SOLID-STATE MAGNETOPLASMA EFFECT FOR MICROWAVE AND MILLIMETER-WAVE PROPAGATION SO IEE PROCEEDINGS-H MICROWAVES ANTENNAS AND PROPAGATION LA English DT Review DE WAVE-GUIDES AND WAVE-GUIDE COMPONENTS; SEMICONDUCTOR DEVICES AND MATERIALS ID MATRIX-METHOD; ANISOTROPIC SUBSTRATE; MICROSTRIP LINE; GREEN-FUNCTION; LAYERED MEDIA; SEMICONDUCTORS; EQUATION; GUIDES AB The behaviour of waveguiding structures loaded with solid-state semiconductors under an external DC magnetic field is considered. The solid-state physical basis for the semiconductor magnetoplasma effect is presented, including carrier transport, Drude model, linearised governing equations and conductivity tensor. The resulting asymmetric anisotropy in the complex-element permittivity tensor can be exploited to generate nonreciprocal propagation. Dynamic numerical methods used to obtain the propagation characteristics of various waveguiding structures, including rectangular, circular and planar (i.e. microstrip, coplanar, slotline and finline) are presented. The frequencies covered extend from about about 9 GHz in the microwave regime up through the millimetre, submillimetre and optical regions. RP KROWNE, CM (reprint author), USN, RES LAB, DIV ELECTR SCI & TECHNOL, MICROWAVE TECHNOL BRANCH, CODE 68503, WASHINGTON, DC 20375 USA. NR 133 TC 14 Z9 14 U1 0 U2 2 PU INST ENGINEERING TECHNOLOGY-IET PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD SG1 2AY, ENGLAND SN 0950-107X J9 IEE PROC-H PD JUN PY 1993 VL 140 IS 3 BP 147 EP 164 PG 18 WC Optics SC Optics GA LN286 UT WOS:A1993LN28600002 ER PT J AU SCHEPS, R MYERS, JF AF SCHEPS, R MYERS, JF TI EFFICIENT, SCALABLE, INTERNALLY FOLDED ND-YAG LASER END-PUMPED BY LASER-DIODES SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID RING LASER AB A scalable diode-pumped Nd:YAG laser is described in which the gain element resembles a penta-prism. This design allows longitudinal pumping along five separate axes. Using five high-power single stripe laser diodes, 4.16 W of absorbed power produced 2.3 W CW at 1.06 mum. The slope efficiency was 56%, the output was plane polarized, and the laser operated in the TEM00 mode. The threshold power was 48 mW. No evidence of thermal saturation was observed up to the maximum pump power. With an intracavity KTP crystal, 341 mW of CW amplitude-stable output at 532 nm was generated. Repetitive Q-switched operation is also reported. RP SCHEPS, R (reprint author), USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,DIV RDT&E,CODE 754,SAN DIEGO,CA 92152, USA. NR 14 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 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD JUN PY 1993 VL 29 IS 6 BP 1515 EP 1519 DI 10.1109/3.234402 PG 5 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA LZ008 UT WOS:A1993LZ00800009 ER PT J AU GOLDBERG, L MEHUYS, D SURETTE, MR HALL, DC AF GOLDBERG, L MEHUYS, D SURETTE, MR HALL, DC TI HIGH-POWER, NEAR-DIFFRACTION-LIMITED LARGE-AREA TRAVELING-WAVE SEMICONDUCTOR AMPLIFIERS SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID UNSTABLE RESONATOR; LASER-AMPLIFIERS; CW; OPERATION; EMISSION; OUTPUT; INDEX AB Operating characteristics of high-power large-active-area GaAlAs amplifiers configured in double-pass and single-pass traveling-wave arrangements are described. Single-pass broad-area amplifiers with a 600 mum stripe width generated up to 21 W of near diffraction-limited emission under pulsed operation when injected with 500 mW from a Ti:Al2O3 laser, and 11.6 W when injected with 100 mW from a laser diode master laser. In CW operation, a broad-area amplifier output of 3.3 W was demonstrated. Tapered-stripe large-area amplifiers emitted up to 4.5 W CW in a near diffraction-limited beam when injected with 150 mW from a Ti:Al2O3 laser. The physical mechanisms causing degradation of the output beam phase front and intensity uniformity at high output power levels, including thermal lensing and filamentation, are presented. C1 SPECTRA DIODE LABS,SAN JOSE,CA 95134. RP GOLDBERG, L (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 34 TC 57 Z9 57 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD JUN PY 1993 VL 29 IS 6 BP 2028 EP 2043 DI 10.1109/3.234466 PG 16 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA LZ008 UT WOS:A1993LZ00800076 ER PT J AU ROUSH, RA MAZZOLA, MS STOUDT, DC AF ROUSH, RA MAZZOLA, MS STOUDT, DC TI INFRARED PHOTOCONDUCTIVITY VIA DEEP COPPER ACCEPTORS IN SILICON-DOPED, COPPER-COMPENSATED GALLIUM-ARSENIDE PHOTOCONDUCTIVE SWITCHES SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article ID SEMICONDUCTOR SWITCHES; GAAS SWITCH; CONDUCTIVITY; BULK AB Silicon-doped, copper-compensated, semi-insulating gallium arsenide of various doping parameters has been studied with respect to infrared photoconductivity. This material is used as a photoconductive switch known as the Bistable Optically controlled Semiconductor Switch (BOSS). This device is a candidate for use in high-power, frequency agile pulsed power applications. One limitation has been the relatively low conductivity of the device during the ''on-state.'' Typically, silicon-doped gallium arsenide is converted to semi-insulating gallium arsenide by the thermal diffusion of copper into the GaAs:Si. We have shown that variation of the diffusion parameters can improve the on-state conductivity by the enhancement of the concentration of a copper center known as CUB. The conductivity of the device 150 ns after irradiation from a 20-ns FWHM laser pulse (lambda = 1.1 mum) is recorded for various incident energies. This on-state conductivity saturates at a value that is predicted by the densities of the copper levels and the mobility. Also, the samples were irradiated with a 140-ps FWHM laser pulse (lambda = 2 mum) in order to excite holes from the copper levels into the valence band which demonstrates the nature of the hole recapture into the various copper acceptors. RP ROUSH, RA (reprint author), USN,CTR SURFACE WARFARE,PULSED POWER SYST & TECHNOL BRANCH,DAHLGREN,VA 22448, USA. NR 14 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD JUN PY 1993 VL 40 IS 6 BP 1081 EP 1086 DI 10.1109/16.214732 PG 6 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA LC005 UT WOS:A1993LC00500006 ER PT J AU NEIDERT, RE PHILLIPS, PM AF NEIDERT, RE PHILLIPS, PM TI LOSSES IN Y-JUNCTION STRIPLINE AND MICROSTRIP FERRITE CIRCULATORS SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article AB This paper describes a complete theory to calculate the dielectric, conductor, and magnetic losses of Y-junction stripline and microstrip ferrite circulators in terms of 3-port S-parameters. Calculations using this theory are presented, and compared with existing data for varied circulator parameters over a frequency range of 1-100 GHz. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. RP NEIDERT, RE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 12 Z9 12 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD JUN-JUL PY 1993 VL 41 IS 6-7 BP 1081 EP 1086 DI 10.1109/22.238531 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA MC680 UT WOS:A1993MC68000029 ER PT J AU FEUER, A CRISTI, R AF FEUER, A CRISTI, R TI ON THE OPTIMAL WEIGHT VECTOR OF A PERCEPTRON WITH GAUSSIAN DATA AND ARBITRARY NONLINEARITY SO IEEE TRANSACTIONS ON SIGNAL PROCESSING LA English DT Note AB In this correspondence we investigate the solution to the following problem: Find the optimal weighted sum of given signals when the optimality criteria is the expected value of a function of this sum and a given ''training'' signal. The optimality criteria can be a nonlinear function from a very large family of possible functions. A number of interesting cases fall under this general framework, such as a single layer perceptron with any of the commonly used nonlinearities, the LMS, the LMF or higher moments, or the various sign algorithms. Assuming the signals to be jointly Gaussian we show that the optimal solution, when it exits, is always collinear with the well-known Wiener solution, and only its scaling factor depends on the particular functions chosen. We also present necessary constructive conditions for the existance of the optimal solution. C1 USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943. RP FEUER, A (reprint author), TECHNION ISRAEL INST TECHNOL,DEPT ELECT ENGN,IL-32000 HAIFA,ISRAEL. NR 4 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1053-587X J9 IEEE T SIGNAL PROCES JI IEEE Trans. Signal Process. PD JUN PY 1993 VL 41 IS 6 BP 2257 EP 2259 DI 10.1109/78.218154 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA LH115 UT WOS:A1993LH11500021 ER PT J AU ABDELHAMID, TK SENGUPTA, K AF ABDELHAMID, TK SENGUPTA, K TI SOFTWARE PROJECT CONTROL - AN EXPERIMENTAL INVESTIGATION OF JUDGMENT WITH FALLIBLE INFORMATION SO IEEE TRANSACTIONS ON SOFTWARE ENGINEERING LA English DT Article DE ANCHORING; EXPERIMENTATION; PROJECT CONTROL; SOFTWARE PRODUCTIVITY; SOFTWARE PROJECT MANAGEMENT ID HEURISTICS; BIASES AB Software project management is becoming an increasingly critical task in many organizations. While the macrolevel aspects of project planning and control have been addressed extensively, there is a serious lack of research on the microempirical analysis of individual decision making behavior. In this study we investigate the heuristics deployed to cope with the problems of poor estimation and poor visibility that hamper software project planning and control, and present the implications for software project management. The paper presents a laboratory experiment in which subjects managed a simulated software development project. The subjects were given project status information at different stages of the lifecycle, and had to assess software productivity in order to dynamically readjust project plans. A conservative anchoring and adjustment heuristic is shown to explain the subjects' decisions quite well. Implications for software project planning and control are presented. RP ABDELHAMID, TK (reprint author), USN,POSTGRAD SCH,DEPT ADM SCI,MONTEREY,CA 93943, USA. NR 27 TC 25 Z9 25 U1 0 U2 7 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0098-5589 J9 IEEE T SOFTWARE ENG JI IEEE Trans. Softw. Eng. PD JUN PY 1993 VL 19 IS 6 BP 603 EP 612 DI 10.1109/32.232025 PG 10 WC Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA LV989 UT WOS:A1993LV98900006 ER PT J AU AK, M BOWER, JH HOFFMAN, SL SEDEGAH, M LEES, A CARTER, M BEAUDOIN, RL CHAROENVIT, Y AF AK, M BOWER, JH HOFFMAN, SL SEDEGAH, M LEES, A CARTER, M BEAUDOIN, RL CHAROENVIT, Y TI MONOCLONAL-ANTIBODIES OF 3 DIFFERENT IMMUNOGLOBULIN-G ISOTYPES PRODUCED BY IMMUNIZATION WITH A SYNTHETIC PEPTIDE OR NATIVE PROTEIN PROTECT MICE AGAINST CHALLENGE WITH PLASMODIUM-YOELII SPOROZOITES SO INFECTION AND IMMUNITY LA English DT Article ID CIRCUMSPOROZOITE PROTEIN; VACCINES; MALARIA; BERGHEI AB Passive transfer of monoclonal antibodies (MAbs) against malaria circumsporozoite (CS) proteins protects animals against malaria. Active immunization with synthetic or recombinant peptides induces a level of polyclonal antibodies to sporozoites comparable to those found after passive immunization but does not provide comparable protection. In the Plasmodium yoelii system, synthetic or recombinant peptide-induced antibodies have never been shown to protect. The current studies were designed to determine whether immunogen structure (native protein versus synthetic peptide) or immunoglobulin G (IgG) subclass of antibodies was responsible for the absolute differences between protective, passively transferred MAbs and nonprotective, actively induced polyclonal antibodies. In this study we produced two MAbs, QGP-S1 (IgG1) and QGP-S2 (IgG2b), by immunization with a synthetic peptide based on the P. yoelii CS major repeat, (QGPGAP)4, conjugated to keyhole limpet hemocyanin. These MAbs were compared to NYS1 (IgG3), an anti-CS protein MAb previously produced by immunization with irradiated P. yoelii sporozoites, which recognizes (QGP GAP)2. QGP-S1 and QGP-S2 passively transferred protection. However, when compared with NYS1, there was a hierarchy of protection, NYS1 > QGP-S1 > QGP-S2. There was no correlation between antibody level at challenge as determined by immunofluorescent antibody test against sporozoites or enzyme-linked immunosorbent assay against (QGPGAP)2 or apparent antibody avidity for (QGPGAP)2 by sodium thiocyanate elution assay. The data demonstrate that a synthetic peptide can induce protective antibodies and that a specific antibody subclass is not required for protection. Work to determine whether antibody affinity or fine specificity can explain the hierarchy of protection among the MAbs is under way. C1 USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20889. PAN AMER HLTH ORG,WASHINGTON,DC 20037. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. WALTER REED ARMY INST RES,DEPT IMMUNOL,WASHINGTON,DC 20307. NR 18 TC 21 Z9 21 U1 0 U2 3 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0019-9567 J9 INFECT IMMUN JI Infect. Immun. PD JUN PY 1993 VL 61 IS 6 BP 2493 EP 2497 PG 5 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA LE498 UT WOS:A1993LE49800031 PM 8500885 ER PT J AU LUNDY, GM AF LUNDY, GM TI SPECIFICATION AND ANALYSIS OF A COMPOSITION OF PROTOCOLS SO INFORMATION SCIENCES LA English DT Article AB A composite protocol constructed from two smaller protocols is formally specified, and a proof of correctness is given. The formal specification of the composite protocol is constructed from the formal specification of the two protocols from which it is composed, and the proof of the composite protocol is an expansion of the correctness proofs of the two smaller protocols. The composite protocol is a data-compression protocol which combines two well-known data-compression protocols, achieving further compression. The protocol processes are specified as a set of actions, each of which has a guard, or Boolean expression. An action may take place only if its guard is true and is an atomic event. Verification is accomplished by proving that the set of states satisfying an invariant is closed. RP LUNDY, GM (reprint author), USN,POSTGRAD SCH,DEPT COMP SCI,MONTEREY,CA 93943, USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0020-0255 J9 INFORM SCIENCES JI Inf. Sci. PD JUN 1 PY 1993 VL 70 IS 3 BP 221 EP 239 DI 10.1016/0020-0255(93)90079-2 PG 19 WC Computer Science, Information Systems SC Computer Science GA LB465 UT WOS:A1993LB46500003 ER PT J AU FOLEN, DR STACKPOLE, LE AF FOLEN, DR STACKPOLE, LE TI OPTICAL STORAGE AND RETRIEVAL OF LIBRARY MATERIAL SO INFORMATION TECHNOLOGY AND LIBRARIES LA English DT Article AB The Ruth H. Hooker Research Library and Technical Information Center of the Naval Research Laboratory has installed an optical disk system consisting of a Sony autochanger, Sun minicomputer, Sun workstations, TDC scanners, printers, personal computers, and various other peripherals. The system stores large portions of the library's collection on twelve-inch optical disks and can be expanded to allow retrieval over the campus network by the scientists of the Naval Research Laboratory. The first segment of the collection to be processed is a technical report collection consisting of 140,000 reports averaging fifty-five pages each. A third of this collection currently been scanned to disk and is available for retrieval and on-demand printing by the library patron. C1 USN,RES LAB,RUTH H HOOKER RES LIB,WASHINGTON,DC 20375. USN,RES LAB,WASHINGTON,DC 20375. RP FOLEN, DR (reprint author), KESTREL ASSOCIATES INC,ARLINGTON,VA, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU AMER LIBRARY ASSN PI CHICAGO PA 50 E HURON ST, CHICAGO, IL 60611 SN 0730-9295 J9 INFORM TECHNOL LIBR JI Inf. Technol. Libr. PD JUN PY 1993 VL 12 IS 2 BP 181 EP 191 PG 11 WC Computer Science, Information Systems; Information Science & Library Science SC Computer Science; Information Science & Library Science GA LJ488 UT WOS:A1993LJ48800003 ER PT J AU SMITH, ML SMITH, NT NESSELER, ESE AF SMITH, ML SMITH, NT NESSELER, ESE TI IN-LINE MEASUREMENT OF ELECTROLYTES, GLUCOSE, AND BLOOD-GASES SO INTERNATIONAL ANESTHESIOLOGY CLINICS LA English DT Article ID CLINICAL-CHEMISTRY; CRITICAL CARE; BEDSIDE; ELECTRODES C1 UNIV CALIF SAN DIEGO,SCH MED,LA JOLLA,CA 92093. VET ADM MED CTR,SAN DIEGO,CA 92161. RP SMITH, ML (reprint author), USN HOSP,DEPT ANESTHESIOL,SAN DIEGO,CA 92134, USA. NR 17 TC 4 Z9 4 U1 0 U2 0 PU LITTLE BROWN CO PI BOSTON PA 34 BEACON STREET, BOSTON, MA 02108-1493 SN 0020-5907 J9 INT ANESTHESIOL CLIN JI Int. Anesthesiol. Clin. PD SUM PY 1993 VL 31 IS 3 BP 159 EP 180 DI 10.1097/00004311-199331030-00011 PG 22 WC Anesthesiology SC Anesthesiology GA LR110 UT WOS:A1993LR11000010 PM 8375907 ER PT J AU Tsang, KY Schwartz, IB AF Tsang, Kwok Yeung Schwartz, Ira B. TI RECURRING ANTI-PHASE SIGNALS IN COUPLED NONLINEAR OSCILLATORS: CHAOTIC OR RANDOM TIME SERIES? SO INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS LA English DT Article AB We discovered the existence of a new type of high-dimensional attractor in coupled nonlinear oscillator systems. Due to the presence of neutrally stable directions on the attractor, there can be noise-driven phase space diffusion. Recurring anti-phase states are observed as coherent portions of the time series. The observed time series looks coherent for a while, then incoherent, and then coherent again. Although the time series "looks" chaotic, the Lyapunov exponents are not positive. C1 [Tsang, Kwok Yeung; Schwartz, Ira B.] US Naval Res Lab, Special Project Nonlinear Sci, Div Plasma Phys, Code 6700-3, Washington, DC 20375 USA. RP Tsang, KY (reprint author), US Naval Res Lab, Special Project Nonlinear Sci, Div Plasma Phys, Code 6700-3, Washington, DC 20375 USA. FU Office of Naval Research; Office of Naval Technology; American Society for Engineering Education FX We thank Raj Roy and Kurt Wiesenfeld for stimulating discussions. This work was supported by the Office of Naval Research, the Office of Naval Technology, and the American Society for Engineering Education. NR 18 TC 5 Z9 5 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0218-1274 EI 1793-6551 J9 INT J BIFURCAT CHAOS JI Int. J. Bifurcation Chaos PD JUN PY 1993 VL 3 IS 3 BP 773 EP 778 DI 10.1142/S0218127493000684 PG 6 WC Mathematics, Interdisciplinary Applications; Multidisciplinary Sciences SC Mathematics; Science & Technology - Other Topics GA V44LR UT WOS:000209751000030 ER PT J AU KERSTEN, PR KAK, AC AF KERSTEN, PR KAK, AC TI A TUTORIAL ON LISP OBJECT-ORIENTED PROGRAMMING FOR BLACKBOARD COMPUTATION (SOLVING THE RADAR TRACKING PROBLEM) SO INTERNATIONAL JOURNAL OF INTELLIGENT SYSTEMS LA English DT Article ID SYSTEM AB This exposition is a tutorial on how object-oriented programming (OOP) in LISP can be used for programming a blackboard. Since we have used Common LISP and the Common LISP Object System (CLOS), the exposition demonstrates how object classes and the primary, before, and after methods associated with the classes can be used for this purpose. The reader should note that the different approaches to object-oriented programming share considerable similarity and, therefore, the exposition should be helpful to even those who may not wish to use CLOS. We have used the radar tracking problem as a ''medium'' for explaining the concepts underlying blackboard programming. The blackboard database is constructed solely of classes which act as data structures as well as method-bearing objects. Class instances form the nodes and the levels of the blackboard. The methods associated with these classes constitute a distributed monitor and support the knowledge sources in modifying the blackboard data. A rule-based planner is used to construct knowledge source activation records from the goals residing in the blackboard. These activation records are enqueued in a cyclic queueing system. A scheduler cycles through the queues and selects knowledge sources to fire. C1 PURDUE UNIV,ROBOT VIS LAB,W LAFAYETTE,IN 47907. RP KERSTEN, PR (reprint author), USN,DIV UNDERSEA WARFARE CTR,CODE 2211,NEWPORT,RI 02841, USA. NR 32 TC 2 Z9 2 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0884-8173 J9 INT J INTELL SYST JI Int. J. Intell. Syst. PD JUN PY 1993 VL 8 IS 5 BP 617 EP 669 DI 10.1002/int.4550080503 PG 53 WC Computer Science, Artificial Intelligence SC Computer Science GA KZ804 UT WOS:A1993KZ80400002 ER PT J AU SHAW, GJ MESSENGER, SR WALTERS, RJ SUMMERS, GP AF SHAW, GJ MESSENGER, SR WALTERS, RJ SUMMERS, GP TI RADIATION-INDUCED REVERSE DARK CURRENTS IN IN0.53GA0.47AS PHOTODIODES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID RECOMBINATION; DIODES AB The reverse dark current-voltage (dark I-V) curves of InGaAs photodiodes have been measured as a function of temperature following irradiation with 1-MeV electrons. Prior to irradiation, the I-V curves are well described by a diffusion term alone indicating that the junctions are of good quality. Irradiation produces a large increase in the generation current which can be modelled as resulting from a single defect center with an energy E(c)-0.29 eV. Such a defect center called E2 has been detected using deep level transient spectroscopy. C1 SFA INC,LANDOVER,MD 20785. UNIV MARYLAND,DEPT PHYS,CATONSVILLE,MD 21228. RP SHAW, GJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 16 Z9 16 U1 2 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 JUN 1 PY 1993 VL 73 IS 11 BP 7244 EP 7249 DI 10.1063/1.354012 PG 6 WC Physics, Applied SC Physics GA LE952 UT WOS:A1993LE95200035 ER PT J AU NGUYEN, NV PELLEGRINO, JG AMIRTHARAJ, PM SEILER, DG QADRI, SB AF NGUYEN, NV PELLEGRINO, JG AMIRTHARAJ, PM SEILER, DG QADRI, SB TI INTERFACE ROUGHNESS OF SHORT-PERIOD ALAS GAAS SUPERLATTICES STUDIED BY SPECTROSCOPIC ELLIPSOMETRY SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID INTERBAND-TRANSITIONS; ERRORS AB Spectroscopic ellipsometry (SE) has been used to study the effects of interface roughness on the optical properties of ultrathin short-period 3 X 3 GaAs/AlAs superlattices grown by molecular-beam epitaxy (MBE). The complex dielectric function and thickness of the whole superlattice and the thickness of the native oxide overlayer were simultaneously determined by an inversion technique from data in the 1.5-5.0 eV region. The main optical critical points E0, E0 + DELTA0, E1, E1 + DELTA1, and E2 were deduced by line-shape fitting of the second derivative of the complex dielectric function of the superlattice to the analytical line-shape expression. The interface roughness is found to shift the optical transitions, except E2, to higher energy and broaden their line shapes. A simple interpretation of the shift and broadening is given. The interface roughness and layer thicknesses obtained by SE are found to be consistent with the results of x-ray diffraction and Raman scattering studies previously reported. The results in this study demonstrate the capability of the post-growth nondestructive characterization by SE to provide useful information about the interface quality of superlattice structures, and consequently to optimize the MBE growth conditions in order to achieve the desired structural parameters. C1 USN,RES LAB,DIV CONDENSED MATTER,WASHINGTON,DC 20375. RP NGUYEN, NV (reprint author), NATL INST STAND & TECHNOL,DIV SEMICOND ELECTR,GAITHERSBURG,MD 20899, USA. NR 23 TC 4 Z9 4 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 JUN 1 PY 1993 VL 73 IS 11 BP 7739 EP 7746 DI 10.1063/1.353972 PG 8 WC Physics, Applied SC Physics GA LE952 UT WOS:A1993LE95200106 ER PT J AU SZYMCZAK, WG ROGERS, JCW SOLOMON, JM BERGER, AE AF SZYMCZAK, WG ROGERS, JCW SOLOMON, JM BERGER, AE TI A NUMERICAL ALGORITHM FOR HYDRODYNAMIC FREE-BOUNDARY PROBLEMS SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID PROGRAMS C1 POLYTECH INST NEW YORK,DEPT MATH,NEW YORK,NY 11201. RP SZYMCZAK, WG (reprint author), USN,CTR SURFACE WARFARE,INFORMAT & MATH SCI BRANCH,CODE R44,SILVER SPRING,MD 20903, USA. NR 32 TC 25 Z9 27 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 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD JUN PY 1993 VL 106 IS 2 BP 319 EP 336 PG 18 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA LD949 UT WOS:A1993LD94900009 ER PT J AU NILIUS, AM SPENCER, SC SIMONSON, LG AF NILIUS, AM SPENCER, SC SIMONSON, LG TI STIMULATION OF INVITRO GROWTH OF TREPONEMA-DENTICOLA BY EXTRACELLULAR GROWTH-FACTORS PRODUCED BY PORPHYROMONAS-GINGIVALIS SO JOURNAL OF DENTAL RESEARCH LA English DT Article ID PERIODONTITIS LESIONS AB Cell-free culture filtrates of Porphyromonas gingivalis grown in Wilkins-Chalgren broth stimulated the growth of six strains of Treponema denticola in 1186 broth when compared with the effect of uninoculated WC. The pH of the 1186 broth was not altered by the addition of either culture filtrate or WC, and all media were fully reduced prior to inoculation with T. denticola. Growth was also stimulated by factors precipitated from the culture filtrate with 90% (NH4)2SO4, 50% cold ethanol, or 50% cold acetone, and by factors retained after dialysis of the culture filtrate through a membrane with a molecular weight cut-off of 50 kDa. Growth factor activity was eliminated by heating of the culture filtrate at 55-degrees-C for 4 h. An ether extract of the culture filtrate containing acetic, butyric, isobutyric, isovaleric, propionic, and phenylacetic acids did not stimulate growth. Since subgingival plaque from periodontal pockets colonized with T. denticola also contains P. gingivalis, certain extracellular proteins with molecular weights greater than 50 kDa produced by P. gingivalis may act as growth factors for T denticola in the microenvironment of the periodontal pocket. C1 USN,DENT RES INST,NAVAL TRAINING CTR,GREAT LAKES,IL 60088. GEOCENTERS INC,FT WASHINGTON,MD 20744. NR 14 TC 24 Z9 26 U1 0 U2 7 PU AMER ASSOC DENTAL RESEARCH PI ALEXANDRIA PA 1619 DUKE ST, ALEXANDRIA, VA 22314 SN 0022-0345 J9 J DENT RES JI J. Dent. Res. PD JUN PY 1993 VL 72 IS 6 BP 1027 EP 1031 DI 10.1177/00220345930720060601 PG 5 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA LG411 UT WOS:A1993LG41100012 PM 8388413 ER PT J AU MINIOTIS, NJ BENNETT, PS JOHNSTON, AD AF MINIOTIS, NJ BENNETT, PS JOHNSTON, AD TI MOLAR EFFICIENCY STUDY OF CHLORINATED NPG SUBSTITUTES IN DENTIN BONDING SO JOURNAL OF DENTAL RESEARCH LA English DT Article ID HARD TOOTH TISSUES; N-PHENYLGLYCINE; ADHESIVE; SYSTEM AB This study evaluated and compared the contributions to dentin adhesive bonding of three N-phenylglycine analogues with electron-withdrawing substituents on the aromatic ring. These electron-deficient ''N-compounds'' included: N-(4-chlorophenyl)-glycine (NCPG), N-methyl-N-(4-chlorphenyl)-glycine (NMNCPG), and N-(3,4-dichlorophenyl)-glycine (NDCPG). An experimental three-step dentin-bonding protocol that consisted of sequential application of acidic ferric oxalate solution, an N-compound in acetone, and a surface-active comonomer in acetone was used. The first and third steps were held constant throughout the study. Each N-compound (NCPG, NMNCPG, NDCPG) was used in step two at ten concentrations ranging from 0.0 mol/L (pure acetone) to 5 x 10(-1) mol/L, depending on solubility. After overnight storage in distilled water, the dentin-to-composite bonds were broken in tension. The data were analyzed with ANOVA, and multiple comparisons were performed with Duncan's Multiple Range test. All statistical tests were controlled at alpha = 0.05. At 5 x 10(-3) mol/L, the relative effectiveness of the three N-compounds (as measured by tensile bond strengths) was NMNCPG > NCPG > NDCPG. Of all concentrations studied, the mean bond strengths produced with NMNCPG were statistically as-good as or better than those produced by the other two compounds, and NCPG was always as good as or better than NDCPG. Increased electron-withdrawing from the nitrogen of the amine group by the substituents narrowed the effective concentration range for dentin bonding and, in general, produced lower mean bond strengths between dentin and composite. C1 USN,SCH DENT,BETHESDA,MD 20814. NATL INST STAND & TECHNOL,AMER DENT ASSOC HLTH FDN,PAFFENBARGER RES CTR,GAITHERSBURG,MD 20899. RI Rastelli, Marcio/B-8034-2011 FU NIDCR NIH HHS [DE05129, DE09322] NR 17 TC 6 Z9 7 U1 0 U2 0 PU AMER ASSOC DENTAL RESEARCH PI ALEXANDRIA PA 1619 DUKE ST, ALEXANDRIA, VA 22314 SN 0022-0345 J9 J DENT RES JI J. Dent. Res. PD JUN PY 1993 VL 72 IS 6 BP 1045 EP 1049 DI 10.1177/00220345930720060901 PG 5 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA LG411 UT WOS:A1993LG41100015 PM 8496477 ER PT J AU FRANKE, ME LYNCH, PM HEALEY, AJ AF FRANKE, ME LYNCH, PM HEALEY, AJ TI A 50-YEAR HISTORY OF THE DYNAMIC-SYSTEMS AND CONTROL DIVISION SO JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME LA English DT Article AB The Division began as a technical committee in 1936 and became the Industrial Instruments and Regulators Division in 1943. Significant events and broadening technology that led to Division name changes and evolution are described. The Division received its current name in 1977. The leadership role of the Division in the field of dynamic systems and control is outlined. Objectives, scope, and activities of the Division are discussed, and statistical data and trends are given. C1 TULANE UNIV,NEW ORLEANS,LA 70118. USN,POSTGRAD SCH,MONTEREY,CA 93943. RP FRANKE, ME (reprint author), USAF,INST TECHNOL,WRIGHT PATTERSON AFB,OH 45433, USA. NR 21 TC 1 Z9 1 U1 1 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-0434 J9 J DYN SYST-T ASME JI J. Dyn. Syst. Meas. Control-Trans. ASME PD JUN PY 1993 VL 115 IS 2B BP 223 EP 233 DI 10.1115/1.2899061 PG 11 WC Automation & Control Systems; Instruments & Instrumentation SC Automation & Control Systems; Instruments & Instrumentation GA LH132 UT WOS:A1993LH13200003 ER PT J AU SEMB, GB ELLIS, JA ARAUJO, J AF SEMB, GB ELLIS, JA ARAUJO, J TI LONG-TERM-MEMORY FOR KNOWLEDGE LEARNED IN SCHOOL SO JOURNAL OF EDUCATIONAL PSYCHOLOGY LA English DT Article ID QUESTIONS; RETENTION; MAINTENANCE; PSYCHOLOGY AB Three experiments examined students' long-term retention of knowledge learned in college courses. In Experiment 1 retention was measured 4 and 11 months after the term ended. Students retained a great deal of what they originally learned, and there were no differential forgetting effects as a function of level of original learning. Experiment 2 compared retention for recall test items and 3 types of multiple-choice test items: recognition, comprehension, and mental skills. Students performed poorer on recall items, but there were no differences among the multiple-choice items measuring the other types of tasks. Experiment 3 analyzed retention for student tutors. Tutors retained more after 4 months than the students they tutored. This suggests that tutoring, a type of overlearning, has positive effects that are maintained over time. C1 USN,CTR PERSONNEL RES & DEV,CODE 13,SAN DIEGO,CA 92152. UNIV KANSAS,LAWRENCE,KS 66045. NR 60 TC 29 Z9 29 U1 1 U2 5 PU AMER PSYCHOLOGICAL ASSOC PI WASHINGTON PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 SN 0022-0663 J9 J EDUC PSYCHOL JI J. Educ. Psychol. PD JUN PY 1993 VL 85 IS 2 BP 305 EP 316 DI 10.1037/0022-0663.85.2.305 PG 12 WC Psychology, Educational SC Psychology GA LF851 UT WOS:A1993LF85100008 ER PT J AU YAMADA, H JUNE, CH FINKELMAN, F BRUNSWICK, M RING, MS LEES, A MOND, JJ AF YAMADA, H JUNE, CH FINKELMAN, F BRUNSWICK, M RING, MS LEES, A MOND, JJ TI PERSISTENT CALCIUM ELEVATION CORRELATES WITH THE INDUCTION OF SURFACE IMMUNOGLOBULIN-MEDIATED B-CELL DNA-SYNTHESIS SO JOURNAL OF EXPERIMENTAL MEDICINE LA English DT Article ID PROTEIN-KINASE-C; INTRACELLULAR IONIZED CALCIUM; TYROSINE PHOSPHORYLATION; CROSS-LINKING; ANTI-IG; LYMPHOCYTES-B; MONOCLONAL-ANTIBODIES; PHOSPHOLIPASE-C; ACTIVATION; ABSENCE AB Surface immunoglobulin (sIg)-mediated stimulation of B lymphocytes induces a tyrosine kinase-dependent sequence of events leading to rapid and large elevations in intracellular ionized calcium ([Ca2+]i). These early biochemical events do not necessarily lead to proliferation of B cells, however, and conversely, the absence of or inhibition of these events does not necessarily prevent cellular proliferation. We now show by digital image analysis of single B cells that conditions which lead to B cell proliferation are associated with low-level but persistent sustained or cyclic elevations in [Ca2+]i. In marked contrast, early and nonsustained elevations in [Ca2+]i are induced in B cells by stimuli that lead to G1 transition but fail to progress to DNA synthesis. Thus, when B cells were stimulated with mitogenic and nonmitogenic anti-IgD antibodies, both of which induce entry of cells into G1 and early calcium transients of comparable magnitude, persistent low-level calcium elevations were only detected in cells stimulated with the mitogenic antibody. Furthermore, persistent calcium elevations were also seen when B cells were stimulated with a multivalent dextran-anti-Ig conjugate which induced very high levels of B cell proliferation in the absence of detectable phosphatidylinositol 4,5-biphosphate hydrolysis or elevations in [Ca2+]i as detected by flow cytometry. Finally, B cells from X-linked B cell-defective mice, which do not proliferate in response to anti-Ig antibody, show marked and early increases in [Ca2+]i, but do not show persistent calcium elevations. These data suggest that the rapid and large increases of [Ca2+]i seen in lymphocytes within seconds after antigen receptor ligation may be associated with entry in G1, whereas low-level but persistent elevations may be the hallmark of a cell destined to synthesize DNA. C1 USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,MAIL STOP 44,BETHESDA,MD 20889. UNIFORMED SERV UNIV HLTH SCI,DEPT MED,BETHESDA,MD 20814. US FDA,CELL BIOL LAB,BETHESDA,MD 20892. GEOCENTERS INC,FT WASHINGTON,MD 20744. FU NIAID NIH HHS [AI-21328, AI-27465] NR 33 TC 42 Z9 42 U1 0 U2 2 PU ROCKEFELLER UNIV PRESS PI NEW YORK PA 1114 FIRST AVE, 4TH FL, NEW YORK, NY 10021 SN 0022-1007 J9 J EXP MED JI J. Exp. Med. PD JUN 1 PY 1993 VL 177 IS 6 BP 1613 EP 1621 DI 10.1084/jem.177.6.1613 PG 9 WC Immunology; Medicine, Research & Experimental SC Immunology; Research & Experimental Medicine GA LD660 UT WOS:A1993LD66000011 PM 8496680 ER PT J AU ANDERSON, GW ROHR, JJ STANLEY, SD AF ANDERSON, GW ROHR, JJ STANLEY, SD TI THE COMBINED DRAG EFFECTS OF RIBLETS AND POLYMERS IN PIPE-FLOW SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article ID TURBULENT BOUNDARY-LAYER; ROUGH PIPES; REDUCTION; SURFACES AB The additional skin friction effect produced by a 3M riblet surface, used in conjunction with low concentration polymer solutions, is investigated in fully developed, turbulent pipe flow. Generally at the low concentrations of Polyox 301 and guar gum studied, the absolute drag reduction of the 3M riblets appears to be independent of the polymer presence, with a maximum between 5 and 7 percent occurring around h+ = 12. Comparisons with previous polymer studies with 3M riblets, sand roughened and commercially rough surfaces are made. RP ANDERSON, GW (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 65 TC 9 Z9 10 U1 1 U2 2 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD JUN PY 1993 VL 115 IS 2 BP 213 EP 221 DI 10.1115/1.2910126 PG 9 WC Engineering, Mechanical SC Engineering GA LK088 UT WOS:A1993LK08800007 ER PT J AU HALL, MS GRIFFIN, OM AF HALL, MS GRIFFIN, OM TI VORTEX SHEDDING AND LOCK-ON IN A PERTURBED FLOW SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article ID CIRCULAR-CYLINDER; OSCILLATING CYLINDER; BLUFF-BODIES; UNIFORM-FLOW; WAKE AB Vortex shedding resonance or lock-on is observed when a bluff body is placed in an incident mean flow with a superimposed periodic component. Direct numerical simulations of this flow at a Reynolds number of 200 are compared here with experiments that have been conducted by several investigators. The bounds of the lock-on or resonance flow regimes for the computations and experiments are in good agreement. The computed and measured vortex street wavelengths also are in good agreement with experiments at Reynolds numbers from 100 to 2000. Comparison of these computations with experiments shows that both natural, or unforced, and forced vortex street wakes are nondispersive in their wave-like behavior. Recent active control experiments with rotational oscillations of a circular cylinder find this same nondispersive behavior over a three-fold range of frequencies at Reynolds numbers up to 15, 000. The vortex shedding and lock-on resulting from the introduction of a periodic inflow component upon the mean flow exhibit a particularly strong resonance between the imposed perturbations and the vortices. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP HALL, MS (reprint author), SCI APPLICAT INT CORP, MCLEAN, VA 22102 USA. NR 36 TC 35 Z9 36 U1 1 U2 7 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA THREE PARK AVE, NEW YORK, NY 10016-5990 USA SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD JUN PY 1993 VL 115 IS 2 BP 283 EP 291 DI 10.1115/1.2910137 PG 9 WC Engineering, Mechanical SC Engineering GA LK088 UT WOS:A1993LK08800018 ER PT J AU BROOK, I AF BROOK, I TI PARONYCHIA - A MIXED INFECTION - MICROBIOLOGY AND MANAGEMENT SO JOURNAL OF HAND SURGERY-BRITISH AND EUROPEAN VOLUME LA English DT Article AB Cultures of paronychia of the fingers have grown aerobic and anaerobic bacteria. Each was recovered individually in only about a quarter of the patients and a mixed aerobic/anaerobic flora was isolated in half of the patients. The predominant anaerobic organisms were Gram-positive anaerobic cocci, Bacteroides species and Fusobacterium species. The predominant aerobic organisms were Staphylococcus aureus, gamma-haemolytic streptococci, Eikenella corrodens, group A beta-hemolytic streptococci, alpha-hemolytic streptococci, and Klebsiella pneumoniae. Candida albicans was recovered in about 15% of the cases. The management of this infection is discussed. C1 USN HOSP,DEPT PAEDIAT,BETHESDA,MD 20814. NR 0 TC 16 Z9 16 U1 0 U2 1 PU CHURCHILL LIVINGSTONE PI EDINBURGH PA JOURNAL PRODUCTION DEPT, ROBERT STEVENSON HOUSE, 1-3 BAXTERS PLACE, LEITH WALK, EDINBURGH, MIDLOTHIAN, SCOTLAND EH1 3AF SN 0266-7681 J9 J HAND SURG-BRIT EUR JI J. Hand Surg.-Br. Eur. Vol. PD JUN PY 1993 VL 18B IS 3 BP 358 EP 359 DI 10.1016/0266-7681(93)90063-L PG 2 WC Orthopedics; Surgery SC Orthopedics; Surgery GA LJ599 UT WOS:A1993LJ59900023 PM 8345268 ER PT J AU DESAVORGNANI, AA HARING, RC GALLOWAY, S AF DESAVORGNANI, AA HARING, RC GALLOWAY, S TI RECRUITING AND RETAINING REGISTERED NURSES IN HOME HEALTH-CARE SO JOURNAL OF NURSING ADMINISTRATION LA English DT Article AB This study examined a personal and professional profile of registered nurses in home care to determine the most influential factors affecting their recruitment, job satisfaction, and retention. With the cooperation of a national, for-profit home healthcare organization in 1990, the authors randomly surveyed its registered nurses, licensed practical nurses, and home health aides in two Midwestern states. Findings for 107 home care registered nurses are presented and compared with responses of licensed practical nurses and home health aides. C1 NATL PRIMARY CARE INST,WASHINGTON,DC. NOVA UNIV,GRAD SCH BUSINESS & ENTREPRENEURSHIP,FT LAUDERDALE,FL 33314. RP DESAVORGNANI, AA (reprint author), USN HOSP,NURSING SERV,JACKSONVILLE,FL, USA. NR 8 TC 2 Z9 2 U1 0 U2 1 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0002-0443 J9 J NURS ADMIN JI J. Nurs. Adm. PD JUN PY 1993 VL 23 IS 6 BP 42 EP 46 DI 10.1097/00005110-199306000-00010 PG 5 WC Nursing SC Nursing GA LH035 UT WOS:A1993LH03500010 PM 8509889 ER PT J AU TAYLOR, RR GUERRIERI, JP NASH, JD HENRY, MR OCONNOR, DM AF TAYLOR, RR GUERRIERI, JP NASH, JD HENRY, MR OCONNOR, DM TI ATYPICAL CERVICAL CYTOLOGY - COLPOSCOPIC FOLLOW-UP USING THE BETHESDA SYSTEM SO JOURNAL OF REPRODUCTIVE MEDICINE LA English DT Article ID PAPANICOLAOU SMEARS; SQUAMOUS CELLS; PAP SMEAR AB Patients with a cytologic diagnosis of either atypical squamous cells of undetermined significance (squamous ACUS) (191), atypical squamous cells suggestive of papillomavirus (ACPV) (79), low grade squamous intraepithelial lesion (LSIL) (184) or atypical glandular cells of undetermined significance (glandular ACUS) (30) obtained over an 18-month period were evaluated colposcopically at the National Naval Medical Center. The diagnosis of squamous atypia rendered using the Bethesda System was reduced when compared to the diagnosis of atypia rendered using traditional cytologic terms (1.9% versus 7.2%). Results from colposcopic evaluations of patients with squamous ACUS demonstrated similar rates of underlying dysplasia as in studies using older terminology (low grade dysplasia in 14% and high grade in 6% of the referrals). Colposcopic evaluation of patients with a referral diagnosis of squamous ACPV demonstrated rates of underlying low grade dysplasia double that of the diagnosis of squamous ACUS but half that of a diagnosis of LSIL (25% versus 14%, and 48%, respectively). Colposcopic evaluation of glandular ACUS rendered a diagnosis of high grade dysplasia more than three times (20%) as often as of squamous ACUS (6%). While the Bethesda System reduces inconsistencies in the diagnosis of atypical cytologic changes, a separate category (ACUS) appears to be useful in identifying underlying, unsuspected low grade dysplasias in our laboratory. In addition, glandular atypias herald a significant rate of underlying high grade dysplasias and warrant immediate colposcopic investigation. C1 UNIFORMED SERV UNIV HLTH SCI,DEPT PATHOL,USN,MED CTR,BETHESDA,MD 20814. RP TAYLOR, RR (reprint author), UNIFORMED SERV UNIV HLTH SCI,DEPT OBSTET & GYNECOL,DIV GYNECOL ONCOL,USN,MED CTR,CODE 0304,BETHESDA,MD 20889, USA. NR 13 TC 75 Z9 77 U1 0 U2 0 PU SCI PRINTERS & PUBL INC PI ST LOUIS PA P.O. DRAWER 12425 8342 OLIVE BLVD, ST LOUIS, MO 63132 SN 0024-7758 J9 J REPROD MED JI J. Reprod. Med. PD JUN PY 1993 VL 38 IS 6 BP 443 EP 447 PG 5 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA LH240 UT WOS:A1993LH24000007 PM 8331623 ER PT J AU CUNNINGHAM, DS CHRISTIE, TL EVANS, EE MCCAUL, JF AF CUNNINGHAM, DS CHRISTIE, TL EVANS, EE MCCAUL, JF TI EFFECT OF THE HELLP-SYNDROME ON MATERNAL IMMUNE FUNCTION SO JOURNAL OF REPRODUCTIVE MEDICINE LA English DT Article ID ELEVATED LIVER-ENZYMES; NATURAL-HISTORY; PRE-ECLAMPSIA; PREGNANCY; PREECLAMPSIA; THROMBOCYTOPENIA; HYPERTENSION; IMMUNOLOGY; HEMOLYSIS; MONOCYTES AB The HELLP syndrome occurs in less than 1 % of gravidas and is characterized by hemolysis, elevated liver enzymes and low platelet count. The status of immune function in these high-risk patients is not known but may be of great importance in better understanding the basis, if any, of immune dysfunction in pregnancy-associated hypertensive disorders and from the potential compounding effect of infection upon an already debilitated patient. We assessed maternal immune status in patients with the HELLP syndrome using conventional in vitro techniques. The results of these studies clearly show a depression of both T and B cell potential and impaired monocyte handling of intracellular pathogens (up to 33 %, 11 % and 17 % of control values, respectively). The onset of this immunosuppression occurred before the clinical diagnosis of HELLP syndrome was made and persisted for at least 14 days after clinical resolution. Results of cell admixture studies suggest that these effects are mediated by accessory cells or their products and do not represent true lymphocyte dysfunction. The risk of opportunistic infections may therefore be increased in the patient with the HELLP syndrome because of this generalized immunosuppression and profound decrease in monocyte phagocytic and bactericidal activity. C1 USN HOSP,DEPT OBSTET & GYNECOL,PORTSMOUTH,VA. NR 24 TC 8 Z9 8 U1 0 U2 0 PU SCI PRINTERS & PUBL INC PI ST LOUIS PA P.O. DRAWER 12425 8342 OLIVE BLVD, ST LOUIS, MO 63132 SN 0024-7758 J9 J REPROD MED JI J. Reprod. Med. PD JUN PY 1993 VL 38 IS 6 BP 459 EP 464 PG 6 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA LH240 UT WOS:A1993LH24000010 PM 8331625 ER PT J AU PAPOULIAS, FA AF PAPOULIAS, FA TI DYNAMICS AND BIFURCATIONS OF PURSUIT GUIDANCE FOR VEHICLE PATH KEEPING IN THE DIVE PLANE SO JOURNAL OF SHIP RESEARCH LA English DT Article AB The problem of dynamic interactions between an orientation control law and pure pursuit guidance law for dive plane response of underwater vehicles is analyzed. A complete stability analysis is performed in order to evaluate regions of stable vehicle operations. It is shown that loss of stability can occur in either a static or dynamic way. In the first, a linearly increasing path deviation is observed, whereas in the second the loss of stability is accompanied by the generation of self-sustained oscillatory motions around the commanded path. Nonlinear analysis reveals the occurrence of both static and Poincare-Andronov-Hopf bifurcations. Numerical experiments support the analytic predictions of the bifurcation analysis. RP PAPOULIAS, FA (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93940, USA. NR 0 TC 2 Z9 2 U1 1 U2 2 PU SOC NAVAL ARCH MARINE ENG PI JERSEY CITY PA 601 PAVONIA AVENUE, JERSEY CITY, NJ 07306 SN 0022-4502 J9 J SHIP RES JI J. Ship Res. PD JUN PY 1993 VL 37 IS 2 BP 148 EP 165 PG 18 WC Engineering, Marine; Engineering, Civil SC Engineering GA LJ288 UT WOS:A1993LJ28800006 ER PT J AU KRIEGSMANN, GA SCANDRETT, CL AF KRIEGSMANN, GA SCANDRETT, CL TI LARGE MEMBRANE ARRAY SCATTERING SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The scattering of a time harmonic acoustic wave by an array of N identical baffled membranes is considered in the limit as N --> infinity. The method of matched asymptotic expansions is used to construct an inner and outer expansion; the inner expansion contains the physics of the local periodic structure and the outer expansion has the proper behavior in the far field. The matching process is used to determine a set of unknown coefficients in the analysis and the result is a far-field pattern for the structure that blends the physics of both expansions. In particular, the far-field pattern is highly localized about the Bragg or mode angles of the inner representation. The maximum value of this function is directly proportional to the reflection coefficient determined numerically from the inner problem. Several numerical examples are presented illustrating these features. Moreover, it is observed that the asymptotic theory agrees quite well with the exact answer (obtained by using a finite difference scheme) when N = 3. C1 USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93942. RP KRIEGSMANN, GA (reprint author), NEW JERSEY INST TECHNOL,CTR APPL MATH & STAT,DEPT MATH,NEWARK,NJ 07102, 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 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUN PY 1993 VL 93 IS 6 BP 3043 EP 3048 DI 10.1121/1.405735 PG 6 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LF769 UT WOS:A1993LF76900003 ER PT J AU NORTON, GV NOVARINI, JC KEIFFER, RS AF NORTON, GV NOVARINI, JC KEIFFER, RS TI AN EVALUATION OF THE KIRCHHOFF APPROXIMATION IN PREDICTING THE AXIAL IMPULSE-RESPONSE OF HARD AND SOFT DISKS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID T-MATRIX; SCATTERING AB To test the ability of the Kirchhoff approximation for estimating the various components in the near-field impulse response of a circular disk, the predictions from a time domain formulation of the Helmholtz-Kirchhoff solution [Trorey, Geophys. 35, 762-864 (1970)] are benchmarked against results obtained via the Fourier synthesis of highly accurate frequency domain solutions [Kristensson and Waterman, J. Acoust. Soc. Am. 72, 1612-1625 (1982)]. In these numerical experiments, a collocated point source and receiver lie on the symmetry axis of an acoustically hard (rigid) or soft (pressure release) disk. A time-domain analysis is carried out in order to unambiguously evaluate the Kirchhoff approximation for different components of the scattered field. It is found that, while Helmholtz-Kirchhoff predicts the correct reflected component, it fails to accurately predict the strength of the diffracted component. The magnitude of the error depends on whether the disk is soft or hard and on the source/receiver height above the disk. The error in the diffracted component exceeds, in some cases, 100%. Furthermore, it is observed that the Helmholtz-Kirchhoff approach does not include the secondary or multiply diffracted arrivals which are more pronounced for the hard disk. C1 PLANNING SYST INC,SLIDELL,LA 70458. RP NORTON, GV (reprint author), USN,RES LAB,BAY ST LOUIS,MS 39529, USA. NR 12 TC 12 Z9 12 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUN PY 1993 VL 93 IS 6 BP 3049 EP 3056 DI 10.1121/1.405736 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LF769 UT WOS:A1993LF76900004 ER PT J AU KEIFFER, RS AF KEIFFER, RS TI ON THE VALIDITY OF THE WEDGE ASSEMBLAGE METHOD FOR PRESSURE-RELEASE SINUSOIDS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID GAUSSIAN ROUGHNESS SPECTRUM; FACET-ENSEMBLE METHOD; SCATTERING; SURFACE; APPROXIMATION; DIFFRACTION AB In the past, the wedge assemblage (WA) method for calculating the acoustic scattering from rough, long-crested, or corrugated surfaces has been compared with both experimental data and exact theory with good results. Nevertheless, significant questions about what physics is included in the method and its realm of validity remain unanswered. In this paper, the WA method is applied to scattering from pressure-release sinusoidal surfaces in order to further explore these topics. Comparisons with accurate benchmark calculations are carried out over a broad range of kh and kLAMBDA (k is the acoustic wave number; h and LAMBDA are the amplitude and wavelength of the sinusoid, respectively) indicate that the primary limitation of the WA method stems from its current failure to include multiple scattering effects. It is also shown that quite good agreement with the benchmark can be achieved by a ''diffraction-only'' WA model even when kh much less than 1 and ''reflectionlike'' scattering patterns are observed. RP KEIFFER, RS (reprint author), USN,RES LAB,BAY ST LOUIS,MS 39529, USA. NR 15 TC 5 Z9 5 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUN PY 1993 VL 93 IS 6 BP 3158 EP 3168 DI 10.1121/1.405700 PG 11 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LF769 UT WOS:A1993LF76900016 ER PT J AU NYSTUEN, JA MCGLOTHIN, CC COOK, MS AF NYSTUEN, JA MCGLOTHIN, CC COOK, MS TI THE UNDERWATER SOUND GENERATED BY HEAVY RAINFALL SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID AMBIENT NOISE; PRECIPITATION; OCEAN AB The underwater acoustic signature of heavy rainfall is very different from that of light rainfall. During heavy rainfall sound levels are observed to rise with increasing rainfall rate at all frequencies monitored (4-21 kHz) and the 15-kHz spectral peak observed during light rainfall is absent. The sound levels are most highly correlated (r almost-equal-to 0.8) with heavy rainfall rate for frequencies less than 10 kHz. Lower correlations between sound levels and heavy rainfall rate were observed for frequencies above 10 kHz under several different conditions. When wind speed exceeds 10 m/s, wave breaking mixes bubbles downward and creates a layer of bubbles. This bubble layer attenuates subsequent surface-generated sound (from the raindrop splashes) for frequencies above 10 kHz. Extremely heavy rainfall (total rainfall above 150 mm/h) also generates a subsurface bubble layer. This rainfall-generated bubble layer is evidence of rainfall-induced turbulent mixing of the ocean surface layer and has implications for air/sea exchange processes (momentum, heat, and gas exchange). Finally, previous studies have shown that light rain generates acoustic energy above 10 kHz and that this sound is poorly correlated with total rainfall rate. A simple empirical acoustic rainfall rate algorithm for heavy rain is offered. This algorithm may be site specific. Furthermore, it overestimates rainfall rate early in the rain events examined here (convective rain events), and then underestimates rainfall rate later in the same events. This observation is shown to be consistent with likely changes in the drop size distribution during the lifetime of the rain event. The sound produced by large drops within heavy rain (drop diameter greater than 2.2 mm) is shown to dominate the underwater sound field. The empirical acoustic rainfall rate algorithm is therefore more correctly a measure of the rainfall rate from large raindrops. Fortunately, the rainfall rate from large raindrops is highly correlated with the total rainfall rate, making acoustic monitoring of underwater sound an effective measure of rainfall rate in oceanic regions. RP NYSTUEN, JA (reprint author), USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943, USA. NR 20 TC 31 Z9 34 U1 2 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUN PY 1993 VL 93 IS 6 BP 3169 EP 3177 DI 10.1121/1.405701 PG 9 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LF769 UT WOS:A1993LF76900017 ER PT J AU THOMPSON, W MONTGOMERY, RE AF THOMPSON, W MONTGOMERY, RE TI APPROXIMATE EVALUATION OF THE SPECTRAL DENSITY INTEGRAL FOR A LARGE PLANAR ARRAY OF RECTANGULAR SENSORS EXCITED BY TURBULENT-FLOW SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB An approximate numerical procedure has been developed for rapidly evaluating the spectral density integral that predicts the output of a planar array of many sensors excited by turbulent boundary layer pressure fluctuations. This procedure is particularly useful in cases where the transfer function factor of the integrand is not a simple function of the wave numbers in the flow and transverse directions. The procedure exploits the facts that the entire integrand is a separable function of these two wave numbers and, when the number of sensors is large, the array function factor of the integrand is a rapidly varying function of wave number, characterized by many similar shaped lobes. In addition, a model for multilayered media is employed to provide the transfer function for boundary conditions that closely correspond to reality. Results generated by this procedure were compared to those from an exact evaluation of the integral which is possible if the transfer function is taken to be constant; there was agreement to within 0.2 dB or better over a broad frequency interval. Some results for a realistic transfer function are presented, such as the case of an elastomeric layer backed by an elastic plate with the sensors embedded at an arbitrary position within the layer. C1 PENN STATE UNIV,APPL RES LAB,UNIV PK,PA 16802. USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,ORLANDO,FL 32856. RP THOMPSON, W (reprint author), PENN STATE UNIV,DEPT ENGN SCI & MECH,UNIV PK,PA 16802, USA. NR 10 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUN PY 1993 VL 93 IS 6 BP 3201 EP 3207 DI 10.1121/1.405704 PG 7 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LF769 UT WOS:A1993LF76900020 ER PT J AU JONES, RL AF JONES, RL TI RESISTANCE OF TIN DIOXIDE TO CHEMICAL-REACTION WITH VANADATE SULFATE MELTS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note ID HOT CORROSION; VANADIUM; OXIDES AB A thermogravimetric analysis/SO3 equilibrium technique has been used to show that tin dioxide (SnO2) is inert to chemical reaction with NaVO3 at 700-degrees and 800-degrees-C under SO3 partial pressures as high as 5 x 10(-2) bar (5 kPa). The results suggest that SnO2 may be potentially useful as a material for protection against molten vanadate-sulfate hot corrosion at moderate temperatures (<800-degrees-C). RP JONES, RL (reprint author), USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375, USA. NR 10 TC 2 Z9 2 U1 0 U2 0 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD JUN PY 1993 VL 76 IS 6 BP 1635 EP 1637 DI 10.1111/j.1151-2916.1993.tb03956.x PG 3 WC Materials Science, Ceramics SC Materials Science GA LZ286 UT WOS:A1993LZ28600040 ER PT J AU YORK, AK ARTHUR, JS AF YORK, AK ARTHUR, JS TI DETERMINING THE HIV STATUS OF PATIENTS OF 3 HIV-POSITIVE NAVY DENTISTS SO JOURNAL OF THE AMERICAN DENTAL ASSOCIATION LA English DT Article ID INFECTION; SURGEON AB The prevalence of human immunodeficiency virus infection has caused the risk of HIV transmission in the health care setting to become a major public concern. Navy medical records were reviewed to investigate the HIV status of 2,887 patients treated by three HIV-positive dentists. C1 NAVAL HLTH RES CTR,DEPT EPIDEMIOL,SAN DIEGO,CA. RP YORK, AK (reprint author), USN DENT CORPS,NATL NAVAL DENT CTR,NAVAL DENT RES INST DETACHMENT,8901 WISCONSIN AVE,BETHESDA,MD 20889, USA. NR 10 TC 7 Z9 7 U1 0 U2 0 PU AMER DENTAL ASSN PI CHICAGO PA 211 E CHICAGO AVE, CHICAGO, IL 60611 SN 0002-8177 J9 J AM DENT ASSOC JI J. Am. Dent. Assoc. PD JUN PY 1993 VL 124 IS 6 BP 74 EP 77 PG 4 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA LG409 UT WOS:A1993LG40900011 PM 8505453 ER PT J AU BROWN, JR CHEW, V MELSON, RO AF BROWN, JR CHEW, V MELSON, RO TI TEMPERATURE AND FLOW-RATE EFFECTS ON MASS MEDIAN DIAMETERS OF THERMALLY GENERATED MALATHION AND NALED FOGS SO JOURNAL OF THE AMERICAN MOSQUITO CONTROL ASSOCIATION LA English DT Note AB The effects of temperature and flow rate on mass median diameters (mmds) of thermally generated aerosol clouds were studied. Number 2 fuel oil alone, undiluted and diluted malathion 91, and undiluted naled were examined. There was a significant flow rate X temperature interaction on the mmds of diluted malathion fogs: i.e., differences among flow rates depended on temperature and vice versa. C1 UNIV FLORIDA,USDA ARS,BIOMETR UNIT,GAINESVILLE,FL 32611. RP BROWN, JR (reprint author), USN,CTR DIS VECTOR ECOL & CONTROL,JACKSONVILLE,FL 32212, USA. NR 3 TC 5 Z9 5 U1 0 U2 0 PU AMER MOSQUITO CONTROL ASSN INC PI LAKE CHARLES PA 707-A EAST PRIEN LAKE ROAD, PO BOX 5416, LAKE CHARLES, LA 70606-5416 SN 8756-971X J9 J AM MOSQUITO CONTR JI J. Am. Mosq. Control Assoc. PD JUN PY 1993 VL 9 IS 2 BP 232 EP 234 PG 3 WC Entomology SC Entomology GA LL221 UT WOS:A1993LL22100021 PM 8350082 ER PT J AU TRZASKOMA, PP EVERETT, RK EDELSTEIN, AS MARUYAMA, B KAATZ, FH VOGEL, FL AF TRZASKOMA, PP EVERETT, RK EDELSTEIN, AS MARUYAMA, B KAATZ, FH VOGEL, FL TI ELECTROCHEMICAL PROPERTIES OF NICL2-INTERCALATED AND REDUCED-NICL2-INTERCALATED GRAPHITE SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Letter ID INTERCALATION COMPOUNDS; COMPOSITES AB The feasibility of modifying graphite, by intercalation, to reduce galvanic reactions in carbon fiber reinforced metal matrix composites is investigated. A nickel chloride intercalation ComPound (NiCl2-GIC) and a reduced nickel chloride intercalation compound were prepared (r-NiCl2-GIC), and their electrochemical properties studied in deaerated 0.1 N NaCl. The open-circuit potential of NiCl2-GIC is about 0.500 V more positive than that of natural graphite while that of r-NiCl2-GIC is about 700 V more negative than that of natural graphite. In the latter case, the potential difference relative to aluminum is reduced by about 50%. Distinct changes in the cathodic behavior of graphite upon intercalation and reduction are also observed. Results are discussed in terms of the effects of these changes on galvanic interactions with aluminum alloy Al 6061-T6. C1 BEAVER PRECIS PROD,TROY,MI 48099. USN,RES LAB,CODE 6371,WASHINGTON,DC 20375. RP TRZASKOMA, PP (reprint author), USN,RES LAB,CODE 6322,WASHINGTON,DC 20375, USA. NR 22 TC 2 Z9 2 U1 0 U2 4 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 JUN PY 1993 VL 140 IS 6 BP L103 EP L106 DI 10.1149/1.2221658 PG 4 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA LG410 UT WOS:A1993LG41000009 ER PT J AU SHAW, JK JORDAN, AK WINFREY, WR AF SHAW, JK JORDAN, AK WINFREY, WR TI LEAKY-TO-BOUND MODE TRANSITION IN A DEPRESSED-CLADDING PLANAR OPTICAL WAVE-GUIDE SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article ID ASYMMETRIC LAYER CONFIGURATION; WAVE-GUIDES; LINE; SCATTERING; EVOLUTION; LOCATION; SURFACE; FIBERS; POLES; SLAB AB An analysis is given for the way in which leaky modes of an open planar symmetric waveguide with depressed cladding migrate as the frequency increases into bound propagating modes. For simple step profiles it is well known that leaky modes start from complex waves, evolve through a nonphysical transition as frequency increases, and then finally become bound modes at cutoff and higher frequencies. We consider the case of depressed cladding (or W) profiles and show that the nonphysical transition attenuates with increasing depth and width of the depression; i.e., the deeper and wider the depression, the narrower the frequency band over which the transition period exists. One indicated consequence is that leaky modes for the W profile have greater influence on the continuous (i.e., radiation-mode) spectrum than do leaky modes of ordinary profiles. Some previously known effects of depressed cladding, such as nonzero cutoff of the fundamental mode, are derived in a new way from the underlying model, and a new phenomenon concerning behavior of the propagation constant at the onset of nonzero cutoff is identified. C1 VIRGINIA TECH UNIV,DEPT MATH,BLACKSBURG,VA 24061. USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375. LITTON POLYSCI CORP,DEPT ENGN,BLACKSBURG,VA 24060. RP SHAW, JK (reprint author), VIRGINIA TECH UNIV,DEPT MATH,BLACKSBURG,VA 24061, USA. NR 28 TC 2 Z9 2 U1 1 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3232 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD JUN PY 1993 VL 10 IS 6 BP 1157 EP 1167 DI 10.1364/JOSAA.10.001157 PG 11 WC Optics SC Optics GA LD265 UT WOS:A1993LD26500004 ER PT J AU CARTER, R AF CARTER, R TI GRAY-SCALE AND ACHROMATIC COLOR DIFFERENCE SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article ID SELF-LUMINOUS DISPLAYS; VISUAL-SEARCH; LUMINANCE DISCRIMINATION; LIGHTNESS; ILLUMINATION; BRIGHTNESS; BLACKNESS; MODEL AB Gray scale is a preferred method for information display, yet existing techniques for constructing a gray scale rely on mathematical formulas that are ambiguous and inconsistent with known phenomena of suprathreshold achromatic perception. To improve this situation, problems are discussed, literature on suprathreshold achromatic perception is reviewed, existing gray-scale formulas are compared with human-performance data, and a new approach is examined. The new approach takes into account the luminances of the surround, the targets, and the distractors that are to be rendered in a gray scale. It is theory based, is consistent with known phenomena of suprathreshold achromatic perception, and fits human-performance data at least as well as any other formula. RP CARTER, R (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 74 TC 11 Z9 11 U1 1 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3232 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD JUN PY 1993 VL 10 IS 6 BP 1380 EP 1391 DI 10.1364/JOSAA.10.001380 PG 12 WC Optics SC Optics GA LD265 UT WOS:A1993LD26500029 ER PT J AU GREENLAW, PS PORT, WH AF GREENLAW, PS PORT, WH TI MILITARY VERSUS CIVILIAN JUDICIAL HANDLING OF SEXUAL HARASSMENT CASES SO LABOR LAW JOURNAL LA English DT Article C1 USN,SUPPLY CORPS,WASHINGTON,DC 20350. RP GREENLAW, PS (reprint author), PENN STATE UNIV,UNIV PK,PA 16802, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU COMMERCE CLEARING HOUSE INC PI CHICAGO PA 4025 W PETERSON AVE, CHICAGO, IL 60646 SN 0023-6586 J9 LABOR LAW J JI Labor Law J. PD JUN PY 1993 VL 44 IS 6 BP 368 EP 374 PG 7 WC Industrial Relations & Labor; Law SC Business & Economics; Government & Law GA LJ381 UT WOS:A1993LJ38100005 ER PT J AU FRIEBELE, EJ AF FRIEBELE, EJ TI CHECK YOUR APPARATUS SO LASER FOCUS WORLD LA English DT Letter RP FRIEBELE, EJ (reprint author), USN,RES LAB,CODE 5610,WASHINGTON,DC 20375, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 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 JUN PY 1993 VL 29 IS 6 BP 71 EP 71 PG 1 WC Optics SC Optics GA MC385 UT WOS:A1993MC38500020 ER PT J AU BAGGA, KS BEINEKE, LW PIPPERT, RE LIPMAN, MJ AF BAGGA, KS BEINEKE, LW PIPPERT, RE LIPMAN, MJ TI A CLASSIFICATION SCHEME FOR VULNERABILITY AND RELIABILITY PARAMETERS OF GRAPHS SO MATHEMATICAL AND COMPUTER MODELLING LA English DT Article AB The purpose of this paper is to introduce a classification scheme for measures of vulnerability and reliability in networks. We use these terms in a general sense. Since many network properties are actually properties of the underlying graph, we restrict this discussion to undirected graphs. C1 INDIANA UNIV PURDUE UNIV,FT WAYNE,IN. OFF NAVAL RES,ARLINGTON,VA 22217. RP BAGGA, KS (reprint author), BALL STATE UNIV,MUNCIE,IN 47306, USA. NR 0 TC 5 Z9 5 U1 0 U2 2 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 JUN PY 1993 VL 17 IS 11 BP 13 EP 16 DI 10.1016/0895-7177(93)90246-U PG 4 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA LU880 UT WOS:A1993LU88000003 ER PT J AU HARARY, F JACOBSON, MS LIPMAN, MJ MCMORRIS, FR AF HARARY, F JACOBSON, MS LIPMAN, MJ MCMORRIS, FR TI ABSTRACT SPHERE-OF-INFLUENCE GRAPHS SO MATHEMATICAL AND COMPUTER MODELLING LA English DT Article AB The SIG, or ''sphere-of-influence graph,'' G(S) of a set S of points in the plane was introduced by G. Toussaint. To each point of S assign an open ball centered at that point of radius equal to the smallest distance from that point to any other point of S. Then the vertex set of G(S) is S and two vertices x and y are adjacent whenever their open balls intersect. An abstract SIG is isomorphic to some G(S). It is verified that every path and every cycle is a SIG, and that every tree is an induced subgraph of some SIG. Corresponding but different results for the proximity graphs which use closed balls are derived. Several unsolved problems are explicitly stated. C1 UNIV LOUISVILLE,DEPT MATH,LOUISVILLE,KY 40292. OFF NAVAL RES,DIV MATH SCI,ARLINGTON,VA 22217. RP HARARY, F (reprint author), NEW MEXICO STATE UNIV,DEPT COMP SCI,LAS CRUCES,NM 88003, USA. NR 8 TC 8 Z9 8 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 JUN PY 1993 VL 17 IS 11 BP 77 EP 83 DI 10.1016/0895-7177(93)90257-Y PG 7 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA LU880 UT WOS:A1993LU88000013 ER PT J AU WAGNER, DK WAN, H AF WAGNER, DK WAN, H TI A POLYNOMIAL-TIME SIMPLEX-METHOD FOR THE MAXIMUM K-FLOW PROBLEM SO MATHEMATICAL PROGRAMMING LA English DT Article DE POLYNOMIAL TIME; SIMPLEX METHOD; MAXIMUM FLOW PROBLEM ID ALGORITHM; NETWORK AB A generalization of the maximum-flow problem is considered in which every unit of flow sent from the source to the sink yields a payoff of $k. In addition, the capacity of any arc e can be increased at a per-unit cost of $c(e). The problem is to determine how much arc capacity to purchase for each arc and how much flow to send so as to maximize the net profit. This problem can be modeled as a circulation problem. The main result of this paper is that this circulation problem can be solved by the network simplex method in at most kmn pivots. When c(e) = 1 for each arc e, this yields a strongly polynomial-time simplex method. This result uses and extends a result of Goldfarb and Hao which states that the standard maximum-flow problem can be solved by the network simplex method in at most mn pivots. C1 OHIO STATE UNIV,MANSFIELD,OH. RP WAGNER, DK (reprint author), OFF NAVAL RES,DIV MATH SCI,800 N QUINCY ST,ARLINGTON,VA 22217, USA. NR 11 TC 2 Z9 2 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 JUN 1 PY 1993 VL 60 IS 1 BP 115 EP 123 DI 10.1007/BF01580604 PG 9 WC Computer Science, Software Engineering; Operations Research & Management Science; Mathematics, Applied SC Computer Science; Operations Research & Management Science; Mathematics GA LQ698 UT WOS:A1993LQ69800007 ER PT J AU DAVIDSSON, JJ AF DAVIDSSON, JJ TI IMPROVE MANUFACTURING QUALITY WITH JUST-IN-TIME TECHNIQUES SO MICROWAVES & RF LA English DT Article RP DAVIDSSON, JJ (reprint author), USN,SHIPS MAT READINESS COURSE,CUSHING RD,NEWPORT,RI 02840, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU PENTON PUBL INC PI CLEVELAND PA 1100 SUPERIOR AVE, CLEVELAND, OH 44114 SN 0745-2993 J9 MICROWAVES RF JI Microw. RF PD JUN PY 1993 VL 32 IS 6 BP 111 EP 113 PG 3 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA LK106 UT WOS:A1993LK10600011 ER PT J AU HUGHES, JH AF HUGHES, JH TI PRIMARY MALIGNANT-TUMORS OF THE SMALL-INTESTINE - A RETROSPECTIVE REVIEW IN A MILITARY HOSPITAL SO MILITARY MEDICINE LA English DT Article AB Small intestinal malignancies are rare and highly variable in clinical presentation. Thirteen cases were found in the Tumor Registry of Naval Hospital, Oakland, California (NHO). We compared the NHO incidence to that of other civilian institutions. Suspicion of these tumors is necessary for early diagnosis and appropriate therapy. We advocate that data from a large number of hospitals be pooled to improve quality of care and better understand possible carcinogenic factors. This review is intended to share our findings and to stimulate further studies. C1 USN HOSP,DEPT SURG,OAKLAND,CA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD JUN PY 1993 VL 158 IS 6 BP 404 EP 407 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA LG142 UT WOS:A1993LG14200018 PM 8361599 ER PT J AU WIRTZ, JJ AF WIRTZ, JJ TI COERCIVE COOPERATION - EXPLAINING MULTILATERAL ECONOMIC SANCTIONS - MARTIN,LL SO MILLENNIUM-JOURNAL OF INTERNATIONAL STUDIES LA English DT Book Review RP WIRTZ, JJ (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU MILLENNIUM-J INT STUD PI LONDON PA LONDON SCHOOL ECONOMICS HOUGHTON ST, LONDON, ENGLAND WC2A 2AE SN 0305-8298 J9 MILLENNIUM-J INT ST JI Millennium-J. Int. Stud. PD SUM PY 1993 VL 22 IS 2 BP 349 EP 351 PG 3 WC International Relations SC International Relations GA LU504 UT WOS:A1993LU50400033 ER PT J AU VANDURICK, MG AF VANDURICK, MG TI THE WAVE OF THE FUTURE - THE UNITED-NATIONS AND NAVAL PEACEKEEPING - STALEY,RS SO MILLENNIUM-JOURNAL OF INTERNATIONAL STUDIES LA English DT Book Review RP VANDURICK, MG (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU MILLENNIUM-J INT STUD PI LONDON PA LONDON SCHOOL ECONOMICS HOUGHTON ST, LONDON, ENGLAND WC2A 2AE SN 0305-8298 J9 MILLENNIUM-J INT ST JI Millennium-J. Int. Stud. PD SUM PY 1993 VL 22 IS 2 BP 361 EP 362 PG 2 WC International Relations SC International Relations GA LU504 UT WOS:A1993LU50400039 ER PT J AU SMIDT, FA HUBLER, GK AF SMIDT, FA HUBLER, GK TI RECENT ADVANCES IN ION-BEAM MODIFICATION OF METALS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS CY SEP 07-11, 1992 CL HEIDELBERG, GERMANY SP MAX PLANCK INST KERNPHYS HEIDELBERG, KERNFORSCHUNGSZENTRUM KARLSRUHE, UNIV HEIDELBERG, MAX PLANCK GESELL, MINIST WISSENSCH & KUNST LANDES BANDEN-HEMBERG, DEUT FORSCHUNGSGEMEINSCH, EUROPEAN MAT RES SOC, INT UNION PURE & APPL PHYS, ANATECH, BAYER ID ASSISTED DEPOSITION; MOLECULAR-DYNAMICS; THIN-FILMS; MICROSTRUCTURE; BOMBARDMENT; IMPLANTATION; FUNDAMENTALS; GROWTH AB Ion beam modification of metals continues to be an active area of research and development. The field has evolved from ion implantation for shallow subsurface treatments to ion beam mixing, and ion beam assisted deposition for coating and thin film applications. The most significant developments in direct ion implantation have been the development of high current sources, commercial scale implantation facilities and plasma source implantation facilities. The ion beam mixing area has seen substantial progress in understanding the relative contributions of ballistic mixing and chemical effects in the thermal spike and in understanding amorphization of solids, ion beam assisted deposition has seen rapid progress in characterizing the effects of the process variables on microstructure and properties and shows tremendous potential for using the energetic flux to tailor properties of thin films. Molecular dynamics modelling has proven to be especially valuable in understanding these low energy ion-solid interactions. Pulsed ion beam evaporation offers some new possibilities for rapid large area deposition of thin films. RP SMIDT, FA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 45 TC 25 Z9 25 U1 0 U2 5 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 JUN PY 1993 VL 80-1 BP 207 EP 216 DI 10.1016/0168-583X(93)96108-O PN 1 PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LK380 UT WOS:A1993LK38000047 ER PT J AU LEE, DH JOHNSON, BM GUARDALA, NA PRICE, JL GLASS, GA STUMBORG, MF JONES, KW AF LEE, DH JOHNSON, BM GUARDALA, NA PRICE, JL GLASS, GA STUMBORG, MF JONES, KW TI NE, AR, FE, AND CU AUGER-ELECTRON PRODUCTION AT NATIONAL SYNCHROTRON LIGHT-SOURCE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB Energetic K and L Auger electrons produced by focussed, filtered, broad-band synchrotron radiation have been measured at the X-ray ring of the National Synchrotron Light Source (NSLS). The X-ray beam was used to study inner-shell photoionization of Ne and Ar gas and Fe and Cu solid film targets. The Auger electrons were analyzed by means of a semihemispherical electrostatic electron spectrometer at the energy resolution of approximately 3%. The electrons were detected at both 90-degrees and 0-degrees with respect to the photon beam direction. Broad distributions of the inner-shell photoelectrons were also observed, reflecting the incoming photon flux distribution. The Fe and Cu K Auger electron spectra were found to be very similar to the Ar K Auger electron spectra. This was expected, since deep inner-shell Auger processes are not affected by the other valence electrons. Above 3 keV in electron energy, there have been few previous Auger electron measurements. C1 USN,CTR SURFACE WARFARE,WHITE OAK LAB,WHITE OAK,MD 20903. UNIV SW LOUISIANA,DEPT PHYS,LAFAYETTE,LA 70504. RP LEE, DH (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. NR 14 TC 0 Z9 0 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 79 IS 1-4 BP 261 EP 264 DI 10.1016/0168-583X(93)95339-7 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400073 ER PT J AU FIORITO, RB RULE, DW PIESTRUP, MA LI, Q HO, AH MARUYAMA, XK AF FIORITO, RB RULE, DW PIESTRUP, MA LI, Q HO, AH MARUYAMA, XK TI PARAMETRIC X-RAY GENERATION FROM MODERATE ENERGY ELECTRON-BEAMS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS AB We have examined parametric X-ray radiation (pXR) as a low cost, pulsed, tuneable X-ray source. In contrast to synchrotron radiation (SR), PXR requires only moderate beam energies produced by conventional linear accelerators. We have determined the maximum PXR intensity that can be achieved from simple crystals placed in a high current, relativistic electron beam. PXR compares favorably to SR on a per electron and pulsed basis. Our calculations and experiments indicate that PXR is a useful source for applications requiring X-rays with energies of a few keV to several tens of keV. For example, we have shown that a PXR source is a viable alternative to SR for digital subtraction angiography based on tuning about the 33 keV iodine K-edge. C1 ADELPHI TECHNOL INC,PALO ALTO,CA 94306. USN,POSTGRAD SCH,MONTEREY,CA 93943. RP FIORITO, RB (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,CODE R-36,SILVER SPRING,MD 20903, USA. NR 5 TC 20 Z9 21 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 JUN PY 1993 VL 79 IS 1-4 BP 758 EP 761 DI 10.1016/0168-583X(93)95461-D PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400195 ER PT J AU MARUYAMA, XK HELLSTERN, MJ REID, CB FIORITO, RB RULE, DW AF MARUYAMA, XK HELLSTERN, MJ REID, CB FIORITO, RB RULE, DW TI OPTICAL-TRANSITION RADIATION INTERFEROMETRY AND BEAM EMITTANCE MEASUREMENTS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 02-05, 1992 CL UNIV N TEXAS, DENTON, TX SP US DOE, NATL SCI FDN, OAK RIDGE ASSOC UNIV, UNIV N TEXAS HO UNIV N TEXAS ID FREE-ELECTRON-LASER AB Optical transition radiation (OTR) patterns were measured using transparent foil and mirror Wartski interferometers. Electron beam divergence and profile were determined by comparing theoretically calculated OTR patterns and experimental data. The Naval Postgraduate School electron linear accelerator was determined to have a horizontal normalized emittance of (305 +/- 45)pi mm mrad and a vertical normalized emittance of (170 +/- 25)pi mm mrad. A comparison of interference patterns made with 0.5 and 5.0 mum clear nitrocellulose foils indicates that radiation produced at the three vacuum-media interfaces was coherent in the case of the thinner foil. C1 USN, CTR SURFACE WARFARE, SILVER SPRING, MD 20903 USA. RP MARUYAMA, XK (reprint author), USN, POSTGRAD SCH, MONTEREY, CA 93943 USA. NR 17 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 79 IS 1-4 BP 788 EP 791 DI 10.1016/0168-583X(93)95470-P PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400204 ER PT J AU KING, SE WELSH, DJ FAUSCH, T DRUKIER, AK KROEGER, RA INDERHEES, SE AF KING, SE WELSH, DJ FAUSCH, T DRUKIER, AK KROEGER, RA INDERHEES, SE TI CRYOGENIC RADIATION DETECTORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article AB Low temperature detectors promise an order of magnitude improvement over semiconducting devices in energy resolution, spatial resolution and radiation hardness. Within this broad field, bolometers and superconducting tunnel junctions are reviewed and potential applications for accelerator based experiments are examined, Our own experiments using Sn, In, Sn(Sb) and In(Bi) alloy based superconducting grain detectors have demonstrated excellent reproducibility and uniformity. C1 UNIV S CAROLINA, DEPT PHYS, COLUMBIA, SC 29208 USA. ZTTF, WALTHER MEISSNER INST, GARCHING, GERMANY. RP USN, RES LAB, CODE 6616, WASHINGTON, DC 20375 USA. NR 16 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X EI 1872-9584 J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1993 VL 79 IS 1-4 BP 832 EP 834 DI 10.1016/0168-583X(93)95480-S PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA LH984 UT WOS:A1993LH98400214 ER PT J AU HARPER, MJ AF HARPER, MJ TI CALCULATION OF RECOIL ION EFFECTIVE TRACK LENGTHS IN NEUTRON-RADIATION-INDUCED NUCLEATION SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article AB A theoretical model was developed to predict the amount of nucleation that occurs as a result of neutron interactions in superheated liquids. The model utilizes nuclear cross-section data, charged-particle linear energy transfer information, and computations of critical bubble nucleation energy to generate the number of bubbles formed in superheated liquid droplet (''bubble'') neutron detectors exposed to neutron fluxes of specified intensity and energy. Previous experimental attempts to relate effective (energy-depositing) ion track length L to critical bubble radius r(c) using a dimensionless coefficient were unsuccessful. The formulation of a new coefficient b, equal to the ratio of effective ion track length L to the seed bubble radius r(o) is now proposed. By parameterizing the value of b within the model, the least-squares best value of b was determined to be 4.3 for both high- and low-energy Cf-252 neutrons. Thus, the effective recoil ion track length in radiation-induced nucleation can be determined if the seed bubble radius is known. RP HARPER, MJ (reprint author), USN ACAD,DEPT NAOME,590 HOLLOWAY RD,ANNAPOLIS,MD 21402, USA. NR 20 TC 16 Z9 16 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD JUN PY 1993 VL 114 IS 2 BP 118 EP 123 PG 6 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LD873 UT WOS:A1993LD87300004 ER PT J AU ATKINSON, RD CURTISS, DC AF ATKINSON, RD CURTISS, DC TI THE INFONET - INTEGRATING NETWORKED CD-ROM DATABASES AND INTERNET SEARCH TOOLS SO ONLINE & CDROM REVIEW LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LEARNED INFORMATION LTD PI OXFORD PA WOODSIDE, HINKSEY HILL, OXFORD, ENGLAND OX1 5AU SN 1353-2642 J9 ONLINE CDROM REV JI Online Cdrom Rev. PD JUN PY 1993 VL 17 IS 3 BP 190 EP 190 PG 1 WC Computer Science, Information Systems; Information Science & Library Science SC Computer Science; Information Science & Library Science GA NP657 UT WOS:A1993NP65700011 ER PT J AU SHANNON, RV FAYAD, J MOORE, J LO, WWM OTTO, S NELSON, RA OLEARY, M AF SHANNON, RV FAYAD, J MOORE, J LO, WWM OTTO, S NELSON, RA OLEARY, M TI AUDITORY BRAIN-STEM IMPLANT .2. POSTSURGICAL ISSUES AND PERFORMANCE SO OTOLARYNGOLOGY-HEAD AND NECK SURGERY LA English DT Article ID HUMAN COCHLEAR NUCLEUS; ELECTRICAL-STIMULATION AB The auditory brainstem implant (ABI) restores some hearing sensations to patients deafened by bilateral acoustic tumors. Electrodes are stable for more than 10 years. In most cases nonauditory side effects can be avoided by judicious selection of the stimulating waveform and electrode configuration. Most perceptual measurements demonstrate that the ABI produces psychophysical and speech performance similar to that of single-channel cochlear implants. ABI patients receive suprasegmental information in speech and significant enhancement of speech understanding when the sound from the ABI is combined with lipreading. C1 SAN DIEGO NAVAL HOSP,SAN DIEGO,CA. ST VINCENTS HOSP,HOUSE EAR CLIN,SAN DIEGO,CA. RP SHANNON, RV (reprint author), HOUSE EAR RES INST,2100 W 3RD ST,LOS ANGELES,CA 90057, USA. FU FDA HHS [FD-4-000686] NR 7 TC 98 Z9 101 U1 0 U2 2 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0194-5998 J9 OTOLARYNG HEAD NECK JI Otolaryngol. Head Neck Surg. PD JUN PY 1993 VL 108 IS 6 BP 634 EP 642 PG 9 WC Otorhinolaryngology; Surgery SC Otorhinolaryngology; Surgery GA LJ663 UT WOS:A1993LJ66300003 PM 8516000 ER PT J AU BASS, JW STEELE, RW WITTLER, RR WEISSE, ME BELL, V HEISSER, AH BRIEN, JH FAJARDO, JE WASSERMAN, GM VINCENT, JM JONES, RG BANKS, RA KROBER, MS EITZEN, EM KOTCHMAR, GS GREENWALL, K BAUGH, JR ROBB, ML MASON, JD AF BASS, JW STEELE, RW WITTLER, RR WEISSE, ME BELL, V HEISSER, AH BRIEN, JH FAJARDO, JE WASSERMAN, GM VINCENT, JM JONES, RG BANKS, RA KROBER, MS EITZEN, EM KOTCHMAR, GS GREENWALL, K BAUGH, JR ROBB, ML MASON, JD TI ANTIMICROBIAL TREATMENT OF OCCULT BACTEREMIA - A MULTICENTER COOPERATIVE STUDY SO PEDIATRIC INFECTIOUS DISEASE JOURNAL LA English DT Article DE OCCULT BACTEREMIA; BACTEREMIA; FEVER; ANTIMICROBIAL TREATMENT; LEUKOCYTOSIS ID FEBRILE CHILDREN; OUTPATIENT BACTEREMIA; CEFTRIAXONE; TEMPERATURE; BLOOD; RISK; AGE AB This prospective multicenter study was conducted to define more clearly clinical and laboratory criteria that predict a strong probability of occult bacteremia and to evaluate the effect of empiric broad spectrum antimicrobial treatment of these children. Children 3 to 36 months old with fever greater-than-or-equal-to 40-degrees-C (104-degrees-F) or, greater-than-or-equal-to 39.5-degrees-C (103-degrees-F) with white blood cells (WBC) greater-than-or-equal-to 15 x 10(9)/liter, and no focus of infection had blood cultures obtained and were randomized to treatment with oral amoxicillin/potassium clavulanate or intramuscular ceftriaxone. Sixty of 519 (11.6%) study patients had positive blood cultures: Streptococcus pneumoniae, 51; Haemophilus influenzae b, 6; Neisseria meningitidis, 2; and Group B Streptococcus, 1. Subgroups of high risk were identified as fever greater-than-or-equal-to 39.5-degrees-C and WBC greater-than-or-equal-to 15 x 10(9)/liter, 55 of 331 or 16.6% positive with increasing incidence of positive culture with increasing increments of degrees of leukocytosis to WBC greater-than-or-equal-to 30 x 10(9)/liter where 9 of 21 or 42.9% were positive. Subgroups of significantly lower risk were identified as fever greater-than-or-equal-to 39.5-degrees-C and WBC <15 x 10(9)/liter, 5 of 182 or 2.7% positive and those with WBC <10 x 10(9)/liter, 0 of 99 or 0.0% positive. Children with positive cultures who received ceftriaxone were nearly all afebrile after 24 hours whereas a significant number who received amoxicillin/potassium clavulanate remained febrile. In the 459 culture-negative children more amoxicillin/potassium clavulanate-treated children developed diarrhea and had less improvement in clinical scores after 24 hours than ceftriaxone-treated children. Children 3 to 36 months old with fever greater-than-or-equal-to 39.5-degrees-C and WBC greater-than-or-equal-to 15 x 10(9)/liter and no focus of infection are at high risk (>16%) for having occult bacteremia. Antimicrobial treatment of febrile children with these high risk criteria appears prudent whereas routine treatment of those with low risk criteria does not. Both treatment regimens evaluated are rational and all patients did well. C1 TRIPLER ARMY MED CTR,DEPT EMERGENCY MED,HONOLULU,HI 96859. UNIV ARKANSAS,LITTLE ROCK,AR 72204. WILLIAM BEAUMONT ARMY MED CTR,EL PASO,TX 79920. BROOKE ARMY MED CTR,SAN ANTONIO,TX. PORTSMOUTH USN HOSP,MED CTR,PORTSMOUTH,VA. MADIGAN ARMY MED CTR,TACOMA,WA 98431. KEESLER MED CTR,KEESLER AFB,MS. FAIRFAX HOSP,FAIRFAX,VA. WALTER REED ARMY MED CTR,WASHINGTON,DC 20307. USN HOSP,MED CTR,SAN DIEGO,CA 92134. RP BASS, JW (reprint author), TRIPLER ARMY MED CTR,DEPT PEDIAT,HONOLULU,HI 96859, USA. RI Steele, Russell/A-6075-2011 NR 30 TC 68 Z9 73 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0891-3668 J9 PEDIATR INFECT DIS J JI Pediatr. Infect. Dis. J. PD JUN PY 1993 VL 12 IS 6 BP 466 EP 473 DI 10.1097/00006454-199306000-00003 PG 8 WC Immunology; Infectious Diseases; Pediatrics SC Immunology; Infectious Diseases; Pediatrics GA LG459 UT WOS:A1993LG45900003 PM 8345978 ER PT J AU OBRIEN, F AF OBRIEN, F TI APPROXIMATION FORMULA FOR UNIT LATTICE AVERAGE DISTANCE IN THE POPULATION-DENSITY INDEX MODEL SO PERCEPTUAL AND MOTOR SKILLS LA English DT Article AB An accurate and rapid approximation formula for calculating the bounds of the population density index is presented. The formula is useful in obtaining rough estimates of the density model's component measures. RP OBRIEN, F (reprint author), USN,DIV UNDERSEA WARFARE CTR,CODE 2211,B 1171-1,NEWPORT,RI 02841, USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU PERCEPTUAL MOTOR SKILLS PI MISSOULA PA PO BOX 9229, MISSOULA, MT 59807 SN 0031-5125 J9 PERCEPT MOTOR SKILL JI Percept. Mot. Skills PD JUN PY 1993 VL 76 IS 3 BP 1071 EP 1074 PN 2 PG 4 WC Psychology, Experimental SC Psychology GA LJ222 UT WOS:A1993LJ22200003 ER PT J AU OBRIEN, F AF OBRIEN, F TI COUNTING YOUR M AND NS SO PERCEPTUAL AND MOTOR SKILLS LA English DT Article AB This paper introduces into the population density index model the measure A(O) which is derived to summarize the occupancy rate of a rectangular grid in the interpretation of spatial density information of finite populations. An approximation of the new measure is also given. RP OBRIEN, F (reprint author), USN,DIV UNDERSEA WARFARE CTR,CODE 2211,B 1171-1,1176 HOWELL ST,NEWPORT,RI 02841, USA. NR 4 TC 2 Z9 2 U1 0 U2 0 PU PERCEPTUAL MOTOR SKILLS PI MISSOULA PA PO BOX 9229, MISSOULA, MT 59807 SN 0031-5125 J9 PERCEPT MOTOR SKILL JI Percept. Mot. Skills PD JUN PY 1993 VL 76 IS 3 BP 1153 EP 1154 PN 2 PG 2 WC Psychology, Experimental SC Psychology GA LJ222 UT WOS:A1993LJ22200019 ER PT J AU ERWIN, SC AF ERWIN, SC TI ELECTRONIC-STRUCTURE OF SUPERCONDUCTING BA6C60 SO PHYSICAL REVIEW B LA English DT Note AB We report the results of first-principles electronic-structure calculations for superconducting Ba6C60. Unlike the A3C60 superconductors, this new compound shows strong Ba-C hybridization in the valence and conduction regions, mixed covalent-ionic bonding character, partial charge transfer, and insulating band structure, with a very small or zero gap within the local-density approximation. C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP ERWIN, SC (reprint author), UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104, USA. RI Erwin, Steven/B-1850-2009 NR 15 TC 43 Z9 43 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 JUN 1 PY 1993 VL 47 IS 21 BP 14657 EP 14660 DI 10.1103/PhysRevB.47.14657 PG 4 WC Physics, Condensed Matter SC Physics GA LF729 UT WOS:A1993LF72900107 ER PT J AU CULLEN, JR HATHAWAY, KB AF CULLEN, JR HATHAWAY, KB TI TEMPERATURE-DEPENDENCE OF THE EXCHANGE ENERGY AND CRITICAL-FIELD FOR ANTIFERROMAGNETICALLY COUPLED THIN-FILMS AND SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Article ID FE LAYERS; INTERLAYER; MAGNETORESISTANCE; MULTILAYERS AB We calculate the temperature dependence of the antiferromagnetic exchange energy and critical magnetic field for a model ferromagnet/paramagnet/ferromagnet (FM/PM/FM) sandwich and a model (FM/PM/FM)infinity superlattice. The temperature dependence is assumed to originate from fluctuations in the spin angular momentum of the FM components, rather than from electronic effects in the PM components. The spins are taken to be localized and coupled via near-neighbor ferromagnetic exchange within the ferromagnets, while spins on outermost layers are coupled to their counterparts across the paramagnetic spacer by a weaker antiferromagnetic exchange. The latter is shown to renormalize with temperature T through a surface-spin-surface-spin correlation function. This correlation function is calculated in the spin-wave region of temperature. For the superlattice, the fractional decrease in critical field and in antiferromagnetic exchange is proportional to T In T except at extremely low T, where there is a T3/2 dependence. For the sandwich, a linear dependence on T is found, with a coefficient that depends logarithmically on the dipole energy. Again, a T3/2 dependence is found as T-->0. We compare these results with related calculations and discuss the experimental implications. RP CULLEN, JR (reprint author), USN,CTR SURFACE WARFARE,WHITE OAK,MD 20903, USA. NR 17 TC 12 Z9 12 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1993 VL 47 IS 22 BP 14998 EP 15006 DI 10.1103/PhysRevB.47.14998 PG 9 WC Physics, Condensed Matter SC Physics GA LF531 UT WOS:A1993LF53100032 ER PT J AU RUBINSTEIN, M LUBITZ, P CARLOS, WE BROUSSARD, PR CHRISEY, DB HORWITZ, J KREBS, JJ AF RUBINSTEIN, M LUBITZ, P CARLOS, WE BROUSSARD, PR CHRISEY, DB HORWITZ, J KREBS, JJ TI PROPERTIES OF SUPERCONDUCTOR-FERROMAGNET BILAYERS - YBA2CUO3-FE AND YBA2CUO3-PERMALLOY SO PHYSICAL REVIEW B LA English DT Note ID HIGH-TC SUPERCONDUCTORS; CU-O; ANISOTROPY AB The superconducting and magnetic properties of thin films of ferromagnetic iron and Permalloy deposited on thin films of YBa2Cu3O7-delta have been investigated. The ferromagnetic films were 50-300 angstrom thick, while the superconducting films were 1000-2000 angstrom thick, The superconducting properties of the films were not affected by the presence of the magnetic layers, but marked changes in the ferromagnetic resonance spectra of the iron and Permalloy films were observed, including the appearance of a large and temperature-dependent magnetic anisotropy. These effects are attributed to the development of a spin-glass-like phase at the superconductor-ferromagnet interface which is coupled to the bulk of the ferromagnetic. RP RUBINSTEIN, M (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 19 TC 14 Z9 14 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1993 VL 47 IS 22 BP 15350 EP 15353 DI 10.1103/PhysRevB.47.15350 PG 4 WC Physics, Condensed Matter SC Physics GA LF531 UT WOS:A1993LF53100083 ER PT J AU CARROLL, TL PECORA, LM AF CARROLL, TL PECORA, LM TI STOCHASTIC RESONANCE AS A CRISIS IN A PERIOD-DOUBLED CIRCUIT SO PHYSICAL REVIEW E LA English DT Article ID EXPONENTS; CHAOS AB Stochastic resonance, a phenomenon in which random transitions between states in a multistate system are modulated by an external periodic signal, is usually studied statistically. In an experiment with a period-doubled circuit, we observe transitions between the two phases of the response induced by noise or chaos. Adding a weak periodic modulation allows us to observe stochastic resonance. It is also noted that transitions between phases are caused by a crisis which may be observed in the circuit. As a result, we are able to describe stochastic resonance with the techniques of deterministic dynamics, providing a link between the fields of deterministic and stochastic mechanics. RP CARROLL, TL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. OI Carroll, Thomas/0000-0002-2371-2049 NR 22 TC 23 Z9 23 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 JUN PY 1993 VL 47 IS 6 BP 3941 EP 3947 DI 10.1103/PhysRevE.47.3941 PG 7 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LJ152 UT WOS:A1993LJ15200022 ER PT J AU GOLDSTEIN, WH ZIGLER, A BURKHALTER, PG NAGEL, DJ BARSHALOM, A OREG, J LUK, TS MCPHERSON, A RHODES, CK AF GOLDSTEIN, WH ZIGLER, A BURKHALTER, PG NAGEL, DJ BARSHALOM, A OREG, J LUK, TS MCPHERSON, A RHODES, CK TI X-RAY-EMISSION FROM A 650-FS LASER-PRODUCED BARIUM PLASMA SO PHYSICAL REVIEW E LA English DT Article ID KRF-STAR LASER; INTENSITY; TARGETS; PULSES; GENERATION; HOT AB We have used x rays in the 9-15-angstrom band emitted from a solid target of BaF2 irradiated by approximately 120 mJ of 248-nm radiation in a 650-fs full width at half maximum Gaussian laser pulse to characterize spectroscopically the resulting ultrashort-pulse laser-produced plasma. The emission was spectrally resolved but space and time integrated. By comparing the spectrum with unresolved-transition-array calculations and measurements of plasma emission from longer-pulse experiments, it is clear that ions as highly stripped as titaniumlike barium are present. We have successfully modeled the observed spectrum by assuming an optically thin source in local thermodynamic equilibrium (LTE) and using the super-transition-array theory [A. Bar-Shalom et al., Phys. Rev. A 40, 3183 (1989)] for emission from a hot, dense plasma. The model indicates that the emitting region is at comparatively low temperature (200-300 eV) and high electron density (10(23)-10(24) cm-3). The degree of agreement between the model and the measured spectrum also suggests that the emitting plasma is near LTE. We conclude that the emission in this band arises from a solid-density plasma formed early in time, and is thus localized in both space and time. This interpretation is reinforced by LASNFX [G. B. Zimmerman and W. L. Kruer, Comments Plasma Phys. Controlled Fusion 11, 51 (1975)] simulations that indicate that emission in this band closely tracks the laser pulse. C1 USN,RES LAB,WASHINGTON,DC 20375. NUCL RES CTR NEGEV,IL-84190 BEER SHEVA,ISRAEL. UNIV ILLINOIS,CHICAGO,IL 60680. RP GOLDSTEIN, WH (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 24 TC 17 Z9 17 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1993 VL 47 IS 6 BP 4349 EP 4353 DI 10.1103/PhysRevE.47.4349 PG 5 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LJ152 UT WOS:A1993LJ15200067 ER PT J AU GANGULY, AK HIRSHFIELD, JL AF GANGULY, AK HIRSHFIELD, JL TI LINEAR AND NONLINEAR-THEORY OF GYROHARMONIC RADIATION INTO MODES OF A CYLINDRICAL WAVE-GUIDE FROM SPATIOTEMPORALLY MODULATED ELECTRON-BEAMS SO PHYSICAL REVIEW E LA English DT Article ID AMPLIFIER; GYROTRON; OSCILLATOR; DESIGN AB Linear and nonlinear theory is presented for the generation of gyroharmonic radiation from spatiotemporally modulated electron beams in cylindrical waveguides. Selection rules for axisymmetric beams are derived that show coupling at the mth temporal harmonic to be absent for all TM modes, and for TE modes other than those with an azimuthal mode index of m. Estimates from linear theory are given for the effects of spreads in axial momentum and guiding-center radius. A nonlinear multimode theory is developed in order to treat mode saturation and mode competition for TE modes in a down-tapered guide magnetic field. Numerical simulations of the multimode nonlinear generation of fifth-harmonic radiation at 94 GHz from a 150-kV, 6.667-A, alpha = 2 beam show that nearly 90% of the initial transverse energy of the beam can be converted to fifth-harmonic radiation in the TE51 mode, and that less than 2.5% of the beam energy is converted to other harmonics. Use of a linearly tapered guide magnetic field gives lower saturated fifth-harmonic conversion efficiency than does use of a nonlinear taper. But the linear-taper case shows greater resilience to axial momentum spread than does the nonlinear taper case. The spent beam is nearly monoenergetic and phase coherent at saturation, suggesting that overall harmonic-conversion efficiencies can approach 100% if a single-stage depressed collector is used to recover the spent beam energy. C1 OMEGA P INC,NEW HAVEN,CT 06520. YALE UNIV,DEPT PHYS,NEW HAVEN,CT 06520. RP GANGULY, AK (reprint author), USN,RES LAB,CODE 6841,WASHINGTON,DC 20375, USA. NR 29 TC 17 Z9 17 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1993 VL 47 IS 6 BP 4364 EP 4380 DI 10.1103/PhysRevE.47.4364 PG 17 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LJ152 UT WOS:A1993LJ15200070 ER PT J AU OVERFELT, PL AF OVERFELT, PL TI CONTINUA OF LOCALIZED WAVE SOLUTIONS VIA A COMPLEX SIMILARITY TRANSFORMATION SO PHYSICAL REVIEW E LA English DT Article ID MAXWELL EQUATIONS; MODES AB In the following, we obtain continua of localized wave solutions to the scalar homogeneous wave, damped wave, and Klein-Gordon equations. We do this by utilizing the fact that similar Ansatze (all of which involve a free-particle time-dependent Schrodinger-like equation) may be used to satisfy all three of these partial differential equations. This Schrodinger-like equation is reduced to an ordinary differential equation (ODE) using a dimensionless complex similarity transformation. A general solution to this ODE involving confluent hypergeometric functions is found. For an azimuthal dependence exp(inuphi), nu is-an-element-of R, this general solution includes many of the previously determined localized wave solutions as special cases. RP OVERFELT, PL (reprint author), USN,CTR AIR WARFARE,RES DEPT,DIV WEAPONS,DIV PHYS,CHINA LAKE,CA 93555, USA. NR 18 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 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JUN PY 1993 VL 47 IS 6 BP 4430 EP 4438 DI 10.1103/PhysRevE.47.4430 PG 9 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LJ152 UT WOS:A1993LJ15200075 ER PT J AU WALKER, JS TALMAGE, G BROWN, SH SONDERGAARD, NA AF WALKER, JS TALMAGE, G BROWN, SH SONDERGAARD, NA TI KELVIN-HELMHOLTZ INSTABILITY OF COUETTE-FLOW BETWEEN VERTICAL WALLS WITH A FREE-SURFACE SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Article ID LIQUID-METAL FLOWS; MOVING CONDUCTING WALL; SKEWED MAGNETIC-FIELD; POWER LOSSES; RECTANGULAR CHANNEL; CURRENT COLLECTORS; DUCTS AB A novel type of Kelvin-Helmholtz instability model is developed from hydrodynamic theory. The classical Kelvin-Helmholtz instability involves a horizontal interface between two fluids with different parallel, uniform, horizontal velocities. If the upper fluid is a gas with a much smaller density than the lower fluid which is a liquid, then the phase velocity of the critical disturbance equals the liquid's velocity, so that the liquid sees a standing interfacial wave. The inertial force driving the interfacial instability involves only the gas, no matter how small its density is. In a much more realistic flow model, the liquid velocity at the free surface is not uniform, but varies across the free surface. The disturbance phase velocity can only equal the liquid velocity at one point, while liquid on either side of this point moves faster or slower than the wave. The inertial forces in the liquid then dominate and the gas plays a negligible role. The concept is developed from a Couette flow hydrodynamic model where the fluid flows between two parallel vertical walls with a free surface. The importance of a nonuniform liquid velocity is demonstrated. This modified theory will be applied in future work to study the ejection instability at the interface of the liquid metal and inert cover gas in sliding electrical contacts. C1 PENN STATE UNIV,DEPT MECH ENGN,UNIV PK,PA 16802. USN,CTR SURFACE WARFARE,CARDEROCK DIV,ANNAPOLIS,MD 21402. RP WALKER, JS (reprint author), UNIV ILLINOIS,DEPT MECH & IND ENGN,URBANA,IL 61801, USA. NR 15 TC 13 Z9 16 U1 1 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8213 J9 PHYS FLUIDS A-FLUID PD JUN PY 1993 VL 5 IS 6 BP 1466 EP 1471 DI 10.1063/1.858584 PG 6 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA LE356 UT WOS:A1993LE35600023 ER PT J AU FREUND, HP AF FREUND, HP TI BEAM TRANSMISSION IN A HIGH-POWER COLLECTIVE FREE-ELECTRON LASER SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID NONLINEAR-ANALYSIS; AMPLIFIERS AB A recent free-electron laser amplifier experiment conducted at the Massachusetts Institute of Technology [M. E. Conde and G. Bekefi, Phys. Rev. Lett. 67, 3082 (1991)] has demonstrated high-power operation without recourse to a tapered wiggler field. The experimental configuration consisted in the propagation of an intense electron beam (750 keV/300 A with a nominal axial energy spread of 1.5%) through a cylindrical waveguide in the presence of both a helical wiggler (B(w) less-than-or-equal-to 1.8 kG and lambda(w) = 3.18 cm) and an axial guide magnetic field (B0 less-than-or-equal-to 12 kG). The experiment operated with the axial guide field oriented both parallel and antiparallel to the direction of the wiggler field, and the maximum efficiency was obtained for the antiparallel (i.e., reversed-field) configuration. The reversed-field case demonstrated an output power of 61 MW at 33.39 GHz for an efficiency of approximately 27%. The performance in the more usual parallel alignment of the fields was much less and peak power levels of only about 4 MW were obtained for both the weak (group I) and strong (group II) field regimes of the axial guide field. A detailed analytical characterization of this experiment has been presented in a previous work [H. P. Freund and A. K. Ganguly, IEEE Trans. Plasma Sci. PS-20, 245 (1992)] in which substantial agreement was found between the theory and the experiment for the reversed-field configuration. However, some discrepancies existed for the group I and II cases, and it was conjectured that some problem with beam transport existed for these configurations which led to an increased beam energy spread. In this paper, the question of beam transport in this experiment is analyzed. It is shown that beam transport is not a problem for the reversed-field configuration. However, substantial beam losses are found in the group I and II regimes, both in the entry taper region of the wiggler and due to high-power electromagnetic waves. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. RP FREUND, HP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 8 Z9 8 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1993 VL 5 IS 6 BP 1869 EP 1876 DI 10.1063/1.860823 PG 8 WC Physics, Fluids & Plasmas SC Physics GA LF953 UT WOS:A1993LF95300023 ER PT J AU UHM, HS AF UHM, HS TI A THEORETICAL INVESTIGATION OF THE PLASMA KLYSTRON AMPLIFIER SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID RELATIVISTIC ELECTRON-BEAMS; GENERATION; INSTABILITY; POWER AB The plasma klystron amplifier concept is investigated. The plasma klystron consists of a relativistic annular electron beam propagating through a space between a plasma column and drift tube wall. The annular electron beam, premodulated at the first cavity in the klystron, enters the space. An axial electric field accompanied by the modulated beam excites space charge waves in the plasma column, which acts like an inductive medium amplifying the electrostatic waves. The physical mechanism of self-amplification of the electrostatic waves is the two-stream instability, which is investigated in detail. Instability criteria indicate that the plasma should be opaque to sustain instability. A theoretical model to describe current modulation of the annular electron beam propagating through the space is developed. The electron beam current is modulated by the amplifying electric field fed by the plasma column. Saturation distance of the current modulation is a weakly dependent function of the initial energy modulation at the first cavity. Thus, a relatively low-power microwave input may well excite the two-stream instability and deliver a highly modulated beam to the extraction cavity. Due to a relatively large growth rate of the instability, required interaction length of the beam and plasma column is short for most applications. RP UHM, HS (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 13 TC 0 Z9 0 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1993 VL 5 IS 6 BP 1877 EP 1887 DI 10.1063/1.860771 PG 11 WC Physics, Fluids & Plasmas SC Physics GA LF953 UT WOS:A1993LF95300024 ER PT J AU LAMPE, M JOYCE, G SLINKER, SP WHITTUM, DH AF LAMPE, M JOYCE, G SLINKER, SP WHITTUM, DH TI ELECTRON-HOSE INSTABILITY OF A RELATIVISTIC ELECTRON-BEAM IN AN ION-FOCUSING CHANNEL SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID PLASMA; TRANSPORT; REGIME AB A relativistic electron beam, propagating in an underdense ion-focusing channel that is embedded within a broad region of underdense plasma, is shown to be subject to a hose instability due to coupling with plasma electrons at the edge of the pure-ion region. The instability is studied by means of linearized analytic calculations of dispersion relations and asymptotic growth, numerical integrations of the linearized dynamical equations, and three-dimensional particle simulations of the full nonlinear evolution. Three cases are considered: (1) If the plasma density n(i0)(r), prior to the introduction of the beam, is uniform, the instability is absolute, grows very rapidly, and does not saturate nonlinearly until the thrashing of the beam carries it into the quasineutral plasma region. Thus the instability prevents orderly beam propagation. (2) If n(i0)(r) consists of a central channel with constant density, surrounded by lower density plasma, the instability is again absolute, but with a reduced growth rate. Over a limited range, propagation without significant disturbance is possible. If the propagation range is long, the instability is stabilized by phase mixing when the beam leaves the channel. The beam then is recentered, with consequent emittance growth. (3) If n(i0)(r) consists of a central channel with a rounded density profile, surrounded by lower density plasma, the instability is convective in the beam frame. If parameters are chosen correctly, the instability does not significantly inhibit long range propagation. C1 NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN. RP LAMPE, M (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 26 TC 23 Z9 23 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1993 VL 5 IS 6 BP 1888 EP 1901 DI 10.1063/1.860772 PG 14 WC Physics, Fluids & Plasmas SC Physics GA LF953 UT WOS:A1993LF95300025 ER PT J AU UHM, HS CHOI, EH AF UHM, HS CHOI, EH TI A THEORETICAL-MODEL OF BULK PLASMA GENERATED BY THE ELECTRON-CYCLOTRON-RESONANCE MECHANISM SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID LOW-PRESSURE; BEAM AB A theoretical model is developed to explain properties of the electron-cyclotron-resonance (ECR) plasma and an experiment is conducted to compare the theoretical predictions with experimental measurements. A theoretical expression of the electron temperature T(e) is obtained assuming that the plasma electrons are heated by the transverse electric field of the input microwave. The electron temperature is expressed as T(e) = a + bp-1/2, where p is the plasma-chamber pressure, and the coefficients a and b should be determined from system parameters. Making use of the ambipolar diffusion, the plasma potential phi is described in terms of the local plasma density n(p). That is ephi(r,z) = T(e) ln[n(p)(r,z)/n(w)], where -e is the electron charge and n(w) is the plasma density at the surface of the chamber. For the case of low neutral density, the plasma density n(p) is also expressed as n(p)2 = gamma2p exp(-epsilon(i)/T(e))-gamma(parallel-to), where epsilon(i) is the ionization energy of neutrals by electrons and the constants gamma2 and gamma(parallel-to) should be determined from system parameters. These theoretical predictions agree reasonably well with experimental data. C1 KWANGWOON UNIV,DEPT PHYS,SEOUL 139701,SOUTH KOREA. RP UHM, HS (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 27 TC 14 Z9 14 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1993 VL 5 IS 6 BP 1902 EP 1910 DI 10.1063/1.860969 PG 9 WC Physics, Fluids & Plasmas SC Physics GA LF953 UT WOS:A1993LF95300026 ER PT J AU UHM, HS AF UHM, HS TI A THEORY OF SPACE-CHARGE LIMITING CURRENT FOR A RELATIVISTIC ELECTRON-BEAM SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Note AB A theory of the space-charge limiting current is developed for a relativistic electron beam propagating through a grounded conducting cylinder. The beam electron density is assumed to be uniform. It is found that the propagating current depends very sensitively on the current density profile. Moreover, the self-consistently evaluated limiting current is considerably larger than the conventionally estimated value. RP UHM, HS (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 10 TC 18 Z9 18 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1993 VL 5 IS 6 BP 1919 EP 1921 DI 10.1063/1.860776 PG 3 WC Physics, Fluids & Plasmas SC Physics GA LF953 UT WOS:A1993LF95300030 ER PT J AU AHLERS, ST SHURTLEFF, D SCHROT, J THOMAS, JR PAULEMILE, F AF AHLERS, ST SHURTLEFF, D SCHROT, J THOMAS, JR PAULEMILE, F TI GLUCOSE ATTENUATES COLD-INDUCED IMPAIRMENT OF DELAYED MATCHING-TO-SAMPLE PERFORMANCE IN RATS SO PSYCHOBIOLOGY LA English DT Article ID MICE; INJECTIONS; MEMORY AB Administration of glucose has been shown to enhance performance in a variety of test situations in which memory is impaired by some amnestic treatment. In the present study, the effects of glucose were examined on a working-memory deficit produced when rats performed a delayed matching-to-sample (DMTS) task while being exposed to ambient cold air. In the DMTS task, the rats were required to respond on one of two levers cued by an illuminated light above the lever on the front wall of an operant chamber. Following a variable delay ranging from 1 to 16 sec, both lights were illuminated and the rats were required to correctly respond on the lever previously cued for a food reward. They responded on the back wall lever during the delay interval to prevent position bias. Glucose (10-500 mg/kg) or saline, administered (i.p.) in a mixed sequence, were given 1 h before a 75-min session in which the rats performed the DMTS task (180 trials). During test sessions, the ambient air temperature was either 23-degrees-C or 2-degrees-C. Administration of glucose during exposure to 23-degrees-C did not systematically affect matching accuracy or other performance measures. In the rats pretreated with saline, exposure to 2-degrees-C produced a downward shift in the delay gradient in that matching accuracy was impaired at all delay intervals when compared with performance at 23-degrees-C. Glucose produced dose-dependent improvement of matching accuracy with short, but not long, interpolated delays. Selective modulation of cold-induced impairment of working memory at the short delays suggests that glucose preferentially enhances stimulus acquisition during exposure to cold stress. RP AHLERS, ST (reprint author), USN,MED RES INST,THERMAL STRESS ADAPTAT PROGRAM,BETHESDA,MD, USA. NR 17 TC 14 Z9 14 U1 1 U2 1 PU PSYCHONOMIC SOC INC PI AUSTIN PA 1710 FORTVIEW RD, AUSTIN, TX 78704 SN 0889-6313 J9 PSYCHOBIOLOGY JI Psychobiology PD JUN PY 1993 VL 21 IS 2 BP 87 EP 92 PG 6 WC Psychology; Psychology, Multidisciplinary SC Psychology GA LG436 UT WOS:A1993LG43600001 ER PT J AU HOWELL, SB SCHMIDT, R DEYOUNG, JA FRIED, R SCHMEER, P GRITZ, L AF HOWELL, SB SCHMIDT, R DEYOUNG, JA FRIED, R SCHMEER, P GRITZ, L TI PHOTOMETRY OF EF PEGASI DURING SUPEROUTBURST SO PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC LA English DT Article ID CATACLYSMIC VARIABLES AB EF Pegasi was observed photometrically during a superoutburst in 1991 October. Superhumps seen during these observations were best fit with a period of 2.09h. This period is used to determine a likely orbital period of 2.05h and a mass ratio (M2/M2) of 0.26. Distance estimates for EF Peg give values of 250 to 600 pc. C1 USN OBSERV,WASHINGTON,DC 20392. BRAESIDE OBSERV,FLAGSTAFF,AZ 86002. RP HOWELL, SB (reprint author), PLANETARY SCI INST,620 N 6TH AVE,TUCSON,AZ 85705, USA. NR 23 TC 21 Z9 21 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 SN 0004-6280 J9 PUBL ASTRON SOC PAC JI Publ. Astron. Soc. Pac. PD JUN PY 1993 VL 105 IS 688 BP 579 EP 585 DI 10.1086/133198 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LJ333 UT WOS:A1993LJ33300006 ER PT J AU WINTERFORD, D LOONEY, RE AF WINTERFORD, D LOONEY, RE TI PUBLIC-SECTOR INVESTMENT IN ENERGY - BUDGETARY CONSTRAINTS AND TRADE-OFFS IN PAKISTAN SO RESOURCES POLICY LA English DT Article AB The generation, transmission and distribution of electrical power is essential for the development of an economy. Potential bottlenecks in the electricity sector can have a far reaching impact on overall economic growth. In many developing countries the public sector is the most active agent in the provision of vital energy services. This article examines Pakistan's experience with public sector investment in energy. A model of government budgetary allocations to energy is developed. In applying this model to Pakistan, the paper analyses the impact of fiscal pressures, unanticipated government expenditure, and competing priorities which have constrained the government's investment programme. The main conclusion reached in the paper is that Pakistani authorities must continue to actively encourage private sector power projects. Otherwise, the country is unlikely to be able to sustain its growth given an increasingly severe energy shortage. RP WINTERFORD, D (reprint author), USN,DEPT NATL SECUR AFFAIRS,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0301-4207 J9 RESOUR POLICY JI Resour. Policy PD JUN PY 1993 VL 19 IS 2 BP 98 EP 105 DI 10.1016/0301-4207(93)90030-Q PG 8 WC Environmental Studies SC Environmental Sciences & Ecology GA LJ607 UT WOS:A1993LJ60700002 ER PT J AU LOSCHIALPO, P MARSH, SJ LEN, LK SMITH, T KAPETANAKOS, CA AF LOSCHIALPO, P MARSH, SJ LEN, LK SMITH, T KAPETANAKOS, CA TI IDENTIFICATION OF TOROIDAL FIELD ERRORS IN A MODIFIED BETATRON ACCELERATOR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB A newly developed probe, having a 0.05% resolution, has been used to detect errors in the toroidal magnetic field of the NRL modified betatron accelerator. Measurements indicate that the radial field components (errors) are 0.1%-1% of the applied toroidal field. Such errors, in the typically 5 kG toroidal field, can excite resonances which drive the beam to the wall. Two sources of detected field errors are discussed. The first is due to the discrete nature of the 12 single turn coils which generate the toroidal field. Both measurements and computer calculations indicate that its amplitude varies from 0% to 0.2% as a function of radius. Displacement of the outer leg of one of the toroidal field coils by a few millimeters has a significant effect on the amplitude of this field error. Because of uniform toroidal periodicity of these coils this error is a good suspect for causing the excitation of the damaging l=12 resonance seen in our experiments. The other source of field error is due to the current feed gaps in the vertical magnetic field coils. A magnetic field is induced inside the vertical field coils' conductor in the opposite direction of the applied toroidal field. Fringe fields at the gaps lead to additional field errors which have been measured as large as 1.0%. This source of field error, which exists at five toroidal locations around the modified betatron, can excite several integer resonances, including the l=12 mode. C1 SFA INC,LANDOVER,MD 20785. FM TECHNOL INC,FAIRFAX,VA 22032. RP LOSCHIALPO, P (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1993 VL 64 IS 6 BP 1425 EP 1431 DI 10.1063/1.1144056 PG 7 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA LF965 UT WOS:A1993LF96500009 ER PT J AU LEADER, JJ AF LEADER, JJ TI BOUNDEDNESS AND ASYMPTOTICS OF A MATRIX ITERATION SO ROCKY MOUNTAIN JOURNAL OF MATHEMATICS LA English DT Article AB The Generalized Theodorus Iteration, a matrix iteration on R(n), is studied. Sufficient conditions for boundedness and asymptotic estimates of divergence are given. The limit sets, which are generally strange attractors, are also briefly discussed. C1 USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93943. NR 10 TC 0 Z9 0 U1 0 U2 0 PU ROCKY MT MATH CONSORTIUM PI TEMPE PA ARIZ STATE UNIV, DEPT MATH, TEMPE, AZ 85281 SN 0035-7596 J9 ROCKY MT J MATH JI Rocky Mt. J. Math. PD SUM PY 1993 VL 23 IS 3 BP 999 EP 1008 DI 10.1216/rmjm/1181072537 PG 10 WC Mathematics SC Mathematics GA MH583 UT WOS:A1993MH58300015 ER PT J AU MEYER, JR HOFFMAN, CA BARTOLI, FJ ARNOLD, DA SIVANANTHAN, S FAURIE, JP AF MEYER, JR HOFFMAN, CA BARTOLI, FJ ARNOLD, DA SIVANANTHAN, S FAURIE, JP TI METHODS FOR MAGNETOTRANSPORT CHARACTERIZATION OF IR DETECTOR MATERIALS SO SEMICONDUCTOR SCIENCE AND TECHNOLOGY LA English DT Article ID HGTE-CDTE SUPERLATTICES; MOLECULAR-BEAM-EPITAXY; P-TYPE HG1-XCDXTE; INTRINSIC CARRIER CONCENTRATION; MERCURY CADMIUM TELLURIDE; ELECTRICAL TRANSPORT-PROPERTIES; IONIZED-IMPURITY SCATTERING; HALL-EFFECT MEASUREMENTS; LIQUID-PHASE-EPITAXY; N-TYPE AB Advanced techniques for the magnetotransport characterization of semiconductor IR detector materials are reviewed. Both conventional mixed-conduction and 'mobility spectrum' analyses of the resistivity tensor as a function of magnetic field and temperature are discussed, as well as a hybrid approach which exploits the advantages of both methods. Assuming that the data are sufficiently sensitive, one obtains concentrations and mobilities for each electron and hole species present in a given sample. This is particularly valuable for narrow-gap infrared detector materials such as Hg1-xCdxTe, since the coexistence of multiple species tends to be the rule rather than the exception, and 'anomalous' Hall data are easily misinterpreted if inferences are drawn from measurements at only a single magnetic field. In addition to bulk electron and hole densities and mobilities, one can determine inversion and accumulation layer properties from the anomalous Hall effect, acceptor binding energies and compensation ratios from the low-temperature freeze-out of free holes, and energy gaps from the temperature dependence of the intrinsic carrier concentration. Shubnikov-de Haas and quantum Hall measurements provide additional information about the spatial distribution of the carriers. Electron and hole mobilities in Hg1-xCdxTe detector materials will be briefly reviewed, and theoretical and experimental results compared. C1 UNIV ILLINOIS, DEPT PHYS, CHICAGO, IL 60680 USA. RP USN, RES LAB, CODE 5651, WASHINGTON, DC 20375 USA. NR 150 TC 99 Z9 101 U1 1 U2 18 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0268-1242 EI 1361-6641 J9 SEMICOND SCI TECH JI Semicond. Sci. Technol. PD JUN PY 1993 VL 8 IS 6 SU S BP 805 EP 823 DI 10.1088/0268-1242/8/6S/004 PG 19 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA LL644 UT WOS:A1993LL64400005 ER PT J AU FLATER, DW YESHA, Y PARK, EK AF FLATER, DW YESHA, Y PARK, EK TI EXTENSIONS TO THE C-PROGRAMMING LANGUAGE FOR ENHANCED FAULT-DETECTION SO SOFTWARE-PRACTICE & EXPERIENCE LA English DT Article DE C; RELIABILITY; RANGE CHECKING; ERROR CHECKING AB The acceptance of the C programming language by academia and industry is partially responsible for the 'software crisis'. The simple, trusting semantics of C mask many common faults, such as range violations, which would be detected and reported at run-time by programs coded in a robust language such as Ada.* This needlessly complicates the debugging of C programs. Although the assert macro lets programmers add run-time consistency checks to their programs, the number of instantiations of this macro needed to make a C program robust makes it highly unlikely that any programmer could correctly perform the task. We make some unobtrusive extensions to the C language which support the efficient detection of faults at run-time without reducing the readability of the source code. Examples of the extensions are automatic checking of error codes returned by library routines, constrained subtypes and detection of references to uninitialized and/or non-existent array elements. C1 USN ACAD,DEPT COMP SCI,ANNAPOLIS,MD 21402. RP FLATER, DW (reprint author), UNIV MARYLAND,DEPT COMP SCI,CATONSVILLE,MD 21228, USA. NR 13 TC 3 Z9 3 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0038-0644 J9 SOFTWARE PRACT EXPER JI Softw.-Pract. Exp. PD JUN PY 1993 VL 23 IS 6 BP 617 EP 628 PG 12 WC Computer Science, Software Engineering SC Computer Science GA LF759 UT WOS:A1993LF75900003 ER PT J AU KJELDSETHMOE, O BRYNILDSEN, N BREKKE, P MALTBY, P BRUECKNER, GE AF KJELDSETHMOE, O BRYNILDSEN, N BREKKE, P MALTBY, P BRUECKNER, GE TI MULTIPLE FLOWS AND THE FINE-STRUCTURE OF THE TRANSITION REGION AROUND SUNSPOTS SO SOLAR PHYSICS LA English DT Article ID MAGNETIC-FIELD; FLUID MOTIONS; CORONAL LOOPS; SIPHON FLOWS; SOLAR CORONA; CHROMOSPHERE; PHOTOSPHERE; SPECTRA AB The fine structure in the flow field in the transition region above and surrounding a sunspot is determined from CIV 1548 angstrom line profiles, observed with the High Resolution Telescope and Spectrograph (HRTS) during the Spacelab 2 mission. The observed line profiles show one, two, or three distinct velocity components within the resolution element of 1'' x 1''. Supersonic flows occur in small regions where the line profile has two or three components. The fine component that shows supersonic speed often is weaker than the subsonic line component, which may explain why some observers have been unable to detect the supersonic flow component. The broadening of individual line components shows non-thermal velocities close to 20 km s-1. This suggests that turbulence is less important than usually considered. The presence of multiple flows, which also occurs in quiet solar regions, suggests that the transition region above sunspots has a sub-arc-second fine structure, perhaps consisting of thin fibrils. The Evershed flow in the transition region appears to have a correspondingly complex character, possibly consisting of sub- and supersonic siphon flows along the individual fibrils. Time changes in the flow field over 5 min may correspond to characteristic times of individual fine structures. Possible explanations of the net downward directed mass flux are presented. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KJELDSETHMOE, O (reprint author), UNIV OSLO,INST THEORET ASTROPHYS,OSLO 3,NORWAY. NR 61 TC 24 Z9 24 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0038-0938 J9 SOL PHYS JI Sol. Phys. PD JUN PY 1993 VL 145 IS 2 BP 257 EP 277 DI 10.1007/BF00690655 PG 21 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LA518 UT WOS:A1993LA51800004 ER PT J AU KEENAN, FP CONLON, ES FOSTER, VJ AGGARWAL, KM WIDING, KG AF KEENAN, FP CONLON, ES FOSTER, VJ AGGARWAL, KM WIDING, KG TI AR(XIII) LINE RATIOS IN SOLAR-FLARES SO SOLAR PHYSICS LA English DT Article ID XUV OBSERVATIONS; COMPACT FLARE; SKYLAB; SUN; SPECTRUM; STRENGTHS; S082A; IX AB Theoretical Ar XIII electron-density-sensitive emission line ratios, derived using electron impact excitation rates interpolated from accurate R-matrix calculations, are presented for R1 = I(242.22 angstrom)/I(236.27 angstrom), R2 = I(210.46 angstrom)/I(236.27 angstrom), and R3 = I(248.68 angstrom)/I(236.27 angstrom). Electron densities deduced from the observed values of R1, R2, and R3 for solar flares obtained with the NRL S082A slitless spectrograph on board Skylab are in excellent agreement, and furthermore compare favorably with those determined from line ratios in Ca XV, which is formed at a similar electron temperature to that of Ar XIII. These results provide experimental support for the accuracy of the atomic data adopted in the analysis, as weil as for the techniques used to calculate the line ratios. C1 UNIV DELHI,DEPT PHYS & ASTROPHYS,DELHI 110007,INDIA. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP KEENAN, FP (reprint author), QUEENS UNIV BELFAST,DEPT PURE & APPL PHYS,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. NR 31 TC 9 Z9 9 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0038-0938 J9 SOL PHYS JI Sol. Phys. PD JUN PY 1993 VL 145 IS 2 BP 291 EP 296 DI 10.1007/BF00690657 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LA518 UT WOS:A1993LA51800006 ER PT J AU NGAI, KL AF NGAI, KL TI COMPARISONS BETWEEN NA-23 AND AL-27 NUCLEAR-SPIN RELAXATIONS AND ELECTRICAL-CONDUCTIVITY RELAXATION IN NA BETA-ALUMINA SO SOLID STATE IONICS LA English DT Article ID VITREOUS IONIC CONDUCTORS; SOLID ELECTROLYTES; DIELECTRIC LOSS; GLASSES; DIFFUSION; MODEL AB Recently several groups have found pronounced differences between mobile ion nuclear spin relaxation (NSR) and electrical conductivity relaxation (ECR) in a number of superionic glasses, and the absence of such pronounced differences if the nuclear spin probed is not that of a mobile ion but one that is tied down to the glassy matrix. By now it is well known that Na beta-Al2O3 though not a superionic glass behaves in many ways like one. Measurements on the Na-23 and Al-27 nuclear relaxation times in Na beta-Al2O3 are compared with electrical conductivity relaxation to show that there is a pronounced difference between Na-23 NSR and ECR and a lack of it between Al-27 NSR and ECR. Thus, these newly discovered properties of superionic glasses carry over to Na beta-Al2O3. Like in superionic glasses, all aspects of NSR and ECR experimental data of Na betaAl2O3 have been explained by the coupling model. RP NGAI, KL (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 42 TC 17 Z9 17 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2738 J9 SOLID STATE IONICS JI Solid State Ion. PD JUN PY 1993 VL 61 IS 4 BP 345 EP 353 DI 10.1016/0167-2738(93)90402-O PG 9 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LL608 UT WOS:A1993LL60800012 ER PT J AU ZAJDOWICZ, T AF ZAJDOWICZ, T TI EPIDEMIOLOGIC AND CLINICAL ASPECTS OF SHIGELLOSIS IN AMERICAN FORCES DEPLOYED TO SAUDI-ARABIA SO SOUTHERN MEDICAL JOURNAL LA English DT Article ID CIPROFLOXACIN; THERAPY; ADULTS AB I describe nine cases of shigellosis seen at a large Navy field hospital in troops deployed to Saudi Arabia during the Gulf War. Eight cases were associated with consumption of food at civilian restaurants or civilian-contracted food services. Two adults had ''pseudomeningitis'' syndromes, illustrating that shigellosis in adults may initially be misdiagnosed. All patients responded rapidly to rehydration and oral fluoroquinolone (ciprofloxacin) therapy. Five patients received an antimotility agent without apparent adverse effect. RP ZAJDOWICZ, T (reprint author), USN HOSP,DIV INFECT DIS,PORTSMOUTH,VA 23708, USA. NR 20 TC 4 Z9 4 U1 0 U2 0 PU SOUTHERN MEDICAL ASSN PI BIRMINGHAM PA 35 LAKESHORE DR PO BOX 190088, BIRMINGHAM, AL 35219 SN 0038-4348 J9 SOUTHERN MED J JI South.Med.J. PD JUN PY 1993 VL 86 IS 6 BP 647 EP 650 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA LH344 UT WOS:A1993LH34400011 PM 8506485 ER PT J AU AMUNDSON, DE AF AMUNDSON, DE TI PERPLEXING PERICARDITIS CAUSED BY COCCIDIOIDOMYCOSIS SO SOUTHERN MEDICAL JOURNAL LA English DT Article C1 USN HOSP,DEPT INTERNAL MED,DIV PULM,SAN DIEGO,CA 92134. RP AMUNDSON, DE (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 13 TC 9 Z9 9 U1 0 U2 0 PU SOUTHERN MEDICAL ASSN PI BIRMINGHAM PA 35 LAKESHORE DR PO BOX 190088, BIRMINGHAM, AL 35219 SN 0038-4348 J9 SOUTHERN MED J JI South.Med.J. PD JUN PY 1993 VL 86 IS 6 BP 694 EP 696 DI 10.1097/00007611-199306000-00023 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA LH344 UT WOS:A1993LH34400023 PM 8506496 ER PT J AU PEHRSSON, PE ARMISTEAD, P SASTRI, S AF PEHRSSON, PE ARMISTEAD, P SASTRI, S TI CARBONIZATION OF CANDIDATE HIGH-TEMPERATURE MATRIX MATERIALS FOR CARBON-CARBON COMPOSITES SO SURFACE AND INTERFACE ANALYSIS LA English DT Article ID CONDUCTIVE POLYMER; SURFACE; FIBERS; XPS; GRAPHITE; SPECTRA; RAMAN AB Carbon precursors used for preparing carbon/carbon composite (CCC) matrix binders undergo component elimination and carbonization during heating, which affects the ultimate carbon product. We analyzed the structural and compositional changes of two polymeric precursors N,N'-(1,3-phenylenedimethylidene)bis(3-ethynylaniline) and 4,4'-bis(3,4-dicyanophenoxy)biphenyl during high-temperature annealing under inert atmosphere. The samples were analyzed using x-ray diffraction, x-ray photoelectron spectroscopy and microRaman scattering. The precursor molecules cross-link during curing and annealing, to form glassy carbons. The carbon structure after the annealing was reflected by the high oxidizability of the carbon in air. Deconvolution of the C 1s and O 1s XPS spectra showed that the surface oxygen was present primarily as hydroxyl and carbonyl groups, and that the amounts of surface oxygen correlated with the extent of graphitization. Addition of iron in the form of ferrocene in the precursor accelerated graphitization at all temperatures. The results are compared to those for other polymer precursors and graphite. C1 GEORGE MASON UNIV,DEPT CHEM,FAIRFAX,VA 22030. RP PEHRSSON, PE (reprint author), USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375, USA. NR 25 TC 4 Z9 4 U1 1 U2 5 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0142-2421 J9 SURF INTERFACE ANAL JI Surf. Interface Anal. PD JUN PY 1993 VL 20 IS 7 BP 573 EP 582 DI 10.1002/sia.740200706 PG 10 WC Chemistry, Physical SC Chemistry GA LH972 UT WOS:A1993LH97200005 ER PT J AU KIM, OK TSAI, TE YOON, TH CHOI, LS AF KIM, OK TSAI, TE YOON, TH CHOI, LS TI ELECTRICAL-CONDUCTIVITY OF LADDER-TYPE POLYMERIC TRANSITION-METAL COMPLEXES DERIVED FROM 2,5-DIAMINO-1,4-BENZENEDITHIOL SO SYNTHETIC METALS LA English DT Article ID POLY(METAL TETRATHIOOXALATES); OXYGEN CARRIERS AB Ladder-type polymeric transition metal(II) complexes based on 2,5-diamino-1,4-benzenedithiol (DADT) are synthesized. DADT is a unique ligand among S,N-donor ligand systems in that its metal complexes have a high conductivity, particularly the Co(II) complex (sigma(RT) = 1.6 S/cm); reaction with atmospheric oxygen decreases the conductivity. These complexes are paramagnetic with g values of 2 at room temperature, but their spin densities vary markedly depending upon the complexed metal. The conductivities of these metal(II) complexes are discussed in relation to oxygenation and magnetic properties. C1 GEOCENTERS INC,FT WASHINGTON,MD 20744. RP KIM, OK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 26 TC 2 Z9 2 U1 0 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD JUN PY 1993 VL 59 IS 1 BP 59 EP 70 DI 10.1016/0379-6779(93)91157-W PG 12 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA LJ442 UT WOS:A1993LJ44200006 ER PT J AU BALL, R AF BALL, R TI EFFECT OF SEVERITY, TIME TO RECOMPRESSION WITH OXYGEN, AND RETREATMENT ON OUTCOME IN 49 CASES OF SPINAL-CORD DECOMPRESSION-SICKNESS SO UNDERSEA & HYPERBARIC MEDICINE LA English DT Article DE DYSBARISM; CENTRAL NERVOUS SYSTEM; MODEL; HYPERBARIC OXYGEN THERAPY AB For systematic study of the effects of clinical severity, time to recompression with oxygen, and re-treatment on outcome from spinal cord DCS, case records from the recompression chamber at the U.S. Naval Station Subic Bay were reviewed. Forty-nine cases of spinal cord DCS were classified using a numerical severity index and time to recompression with oxygen. Cases were divided by initial severity into mild, moderate, and severe groups and by time to recompression with oxygen into less than 12-h, 12-24-h, and greater than 24-h groups. Re-treatment effect was analyzed by severity after the first treatment and by the depth of the re-treatment table used. Severity after all treatment is strongly correlated with initial severity (r = 0.88) and moderately correlated with time to recompression with oxygen (r = 0.58). Response to treatment is significantly different among initial severity groups (P < 0.001). Delay to treatment worsens outcome for severely injured divers (P = 0.008). Residual severity after all treatments is highly correlated with severity after the first treatment (r = 0.97). There is no difference in re-treatment outcome by groups defined by severity after the first treatment or by 60- or 45-ft re-treatment tables. RP BALL, R (reprint author), USN,MED RES INST,BETHESDA,MD 20889, USA. NR 15 TC 49 Z9 51 U1 0 U2 1 PU UNDERSEA & HYPERBARIC MEDICAL SOC INC PI KENSINGTON PA 10531 METROPOLITAN AVE, KENSINGTON, MD 20895 SN 1066-2936 J9 UNDERSEA HYPERBAR M JI Undersea Hyperb. Med. PD JUN PY 1993 VL 20 IS 2 BP 133 EP 145 PG 13 WC Marine & Freshwater Biology; Medicine, Research & Experimental SC Marine & Freshwater Biology; Research & Experimental Medicine GA LH323 UT WOS:A1993LH32300003 PM 8329940 ER PT J AU BARRIE, WE AF BARRIE, WE TI GRAVES OPHTHALMOPATHY SO WESTERN JOURNAL OF MEDICINE LA English DT Article ID THYROID-ASSOCIATED OPHTHALMOPATHY; ORBITAL DECOMPRESSION; RETROOCULAR FIBROBLASTS; OPTIC NEUROPATHY; HLA-DR; DISEASE; THERAPY; HYPERTHYROIDISM; RADIOIODINE; MANAGEMENT AB Ophthalmopathy develops in about 30% of patients who have Graves' disease. The pathogenesis, like that of the hyperthyroidism, is probably autoimmune in nature. The eye manifestations are diverse and include lid lag, soft tissue swelling, proptosis, corneal damage, diplopia, and optic neuropathy. The natural history is benign in 90% of patients, with gradual improvement over time. Therapeutic options include corticosteroid therapy, radiation, and surgical treatment. The last is usually the therapy of choice for severe or disfiguring ophthalmopathy. RP BARRIE, WE (reprint author), USN HOSP,DEPT INTERNAL MED,7500 E CARSON ST,LONG BEACH,CA 90822, USA. NR 40 TC 3 Z9 4 U1 0 U2 0 PU CALIFORNIA PHYSICIAN MAGAZINE PI SAN FRANCISCO PA C/O DONNA TAYLOR, EDITOR, PO BOX 7690, SAN FRANCISCO, CA 94102-7690 SN 0093-0415 J9 WESTERN J MED JI West. J. Med. PD JUN PY 1993 VL 158 IS 6 BP 591 EP 595 PG 5 WC Medicine, General & Internal SC General & Internal Medicine GA LG386 UT WOS:A1993LG38600002 PM 8337853 ER PT J AU SERLIN, V FRIEDMAN, M AF SERLIN, V FRIEDMAN, M TI EXTERNAL MODULATION OF INTENSE RELATIVISTIC ELECTRON-BEAMS WITH SPATIAL AND VELOCITY INHOMOGENEITIES SO APPLIED PHYSICS LETTERS LA English DT Article AB A new mechanism using a relatively low power rf source to modulate an intense relativistic electron beam was investigated. The electron beam, which had spatial and velocity inhomogeneities, interacted with two coaxial cavities, one of which was loaded with rf energy from an external generator, at a frequency of 3.5 GHz. This interaction led to an energy feedback mechanism between the cavities via reflexing electrons, resulting in a large and stable amplitude current modulation. RP SERLIN, V (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 9 TC 7 Z9 8 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 31 PY 1993 VL 62 IS 22 BP 2772 EP 2774 DI 10.1063/1.109256 PG 3 WC Physics, Applied SC Physics GA LE353 UT WOS:A1993LE35300010 ER PT J AU KERSEY, AD MOREY, WW AF KERSEY, AD MOREY, WW TI MULTIELEMENT BRAGG-GRATING BASED FIBER-LASER STRAIN SENSOR SO ELECTRONICS LETTERS LA English DT Article DE FIBER OPTIC SENSORS; FIBER LASERS AB A fibre laser configuration is described which uses multiple fibre Bragg grating sensors as feedback elements. By tuning a wavelength selective filter located within the laser cavity over the gain bandwidth, the laser selectively lases at each of the Bragg wavelengths of the sensors, thus allowing strain induced shifts in the Bragg wavelengths to be monitored. A four sensor system is reported. C1 UNITED TECHNOL RES CTR,E HARTFORD,CT 06108. RP KERSEY, AD (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5674,WASHINGTON,DC 20375, USA. NR 9 TC 42 Z9 47 U1 0 U2 3 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 MAY 27 PY 1993 VL 29 IS 11 BP 964 EP 966 DI 10.1049/el:19930642 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA LN439 UT WOS:A1993LN43900019 ER PT J AU BUCHOLTZ, F VILLARRUEL, CA KIRKENDALL, CK DAGENAIS, DM MCVICKER, JA DAVIS, AR PATRICK, SS KOO, KP WATHEN, KG DANDRIDGE, A WANG, G LUND, T VALO, H AF BUCHOLTZ, F VILLARRUEL, CA KIRKENDALL, CK DAGENAIS, DM MCVICKER, JA DAVIS, AR PATRICK, SS KOO, KP WATHEN, KG DANDRIDGE, A WANG, G LUND, T VALO, H TI FIBER OPTIC MAGNETOMETER SYSTEM FOR UNDERSEA APPLICATIONS SO ELECTRONICS LETTERS LA English DT Article DE MAGNETIC DEVICES; OPTICAL MEASUREMENT; OPTICAL SENSORS ID FIBER AB An undersea-deployed, remotely-operated, interferometric fibre optic sensor system consisting of two three-axis magnetometers is described. During undersea testing, the system demonstrated 0.6 murad/square-root (Hz) phase resolution and 150pT/square-root (Hz) magnetic field resolution at 0.1 Hz. C1 NORWEGIAN DEF RES ESTAB,N-2007 KJELLER,NORWAY. UNIV RES FDN,GREENBELT,MD. SFA,LANDOVER,MD. VIRGINIA POLYTECH INST & STATE UNIV,BLACKSBURG,VA 24061. RP BUCHOLTZ, F (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5674,WASHINGTON,DC 20375, USA. NR 6 TC 8 Z9 8 U1 0 U2 3 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 MAY 27 PY 1993 VL 29 IS 11 BP 1032 EP 1033 DI 10.1049/el:19930690 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA LN439 UT WOS:A1993LN43900067 ER PT J AU WU, SM BAZAR, LS COHN, ML CAHILL, RA CHAN, WY AF WU, SM BAZAR, LS COHN, ML CAHILL, RA CHAN, WY TI EXPRESSION OF PREGNANCY-SPECIFIC BETA-1-GLYCOPROTEIN GENES IN HEMATOPOIETIC-CELLS SO MOLECULAR AND CELLULAR BIOCHEMISTRY LA English DT Article DE PSG TRANSCRIPTS; GENE EXPRESSION; PCR; T-LYMPHOCYTES ID CROSS-REACTING ANTIGEN; CARCINOEMBRYONIC ANTIGEN; MOLECULAR-CLONING; FETAL LIVER; FAMILY MEMBER; MESSENGER-RNA; CEA FAMILY; CDNA; GLYCOPROTEIN; PROTEINS AB The presence of PSG in blood cells has been demonstrated by immunohistochemical staining. However, the origin of these proteins is not known. This report examines the expression of the PSG genes in different types of freshly isolated blood cells. RNA isolated from bone marrow and peripheral blood cells of healthy individuals was analyzed for PSG transcripts by reverse transcriptase - polymerase chain reaction using synthetic oligonucleotide primers specific for the PSG genes. The level of expression of the PSG genes in different types of cells exhibited significant individual variation. Trace amounts of PSG transcripts could be detected in polymorphonuclear cells (PMN), monocytes and B lymphocytes while T lymphocytes always contained the highest level of transcript. The expression of PSG genes in the blood cells apparently was not affected by the method of isolation nor by overnight culturing of these cells except in the case when lymphocytes were separated by rosetting with sheep red blood cells. All reported PSG transcripts were detected in blood cells. Both type I and type II transcripts of the PSG genes were detected in blood cells with the exception of type II transcript of PSG5 and PSG11 which were only found in the placenta. Tissue specificity in the expression or alternative splicing of some of the PSG family members was implicated. C1 GEORGETOWN UNIV,MED CTR,DEPT PEDIAT,3800 RESERVOIR RD NW,WASHINGTON,DC 20007. GEORGETOWN UNIV,MED CTR,DEPT MED,WASHINGTON,DC 20007. GEORGETOWN UNIV,MED CTR,DEPT BIOCHEM & MOLEC BIOL,WASHINGTON,DC 20007. GEORGETOWN UNIV,MED CTR,DEPT ANAT & CELL BIOL,WASHINGTON,DC 20007. USN,MED RES INST,BETHESDA,MD 20889. FU NICHD NIH HHS [HD21793] NR 42 TC 21 Z9 21 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0300-8177 J9 MOL CELL BIOCHEM JI Mol. Cell. Biochem. PD MAY 26 PY 1993 VL 122 IS 2 BP 147 EP 158 DI 10.1007/BF01076099 PG 12 WC Cell Biology SC Cell Biology GA LP403 UT WOS:A1993LP40300007 PM 8232246 ER PT J AU ROUSH, RA STOUDT, DC MAZZOLA, MS AF ROUSH, RA STOUDT, DC MAZZOLA, MS TI COMPENSATION OF SHALLOW SILICON DONORS BY DEEP COPPER ACCEPTORS IN GALLIUM-ARSENIDE SO APPLIED PHYSICS LETTERS LA English DT Article ID DEFECTS; GAAS AB Electrical compensation in n-type, silicon-doped, GaAs (GaAs:Si) has been achieved for several different silicon doping densities. The introduction of deep copper acceptors into GaAs:Si through a thermal diffusion process has produced semi-insulating GaAs:Si:Cu. The density of diffused copper is shown to be predicted, to a good approximation, by knowledge of both the annealing temperature at which compensation is observed, and the initial free-electron density. Also, a model based on Fermi-Dirac statistics has demonstrated the same qualitative behavior as the data. RP ROUSH, RA (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,PULSED POWER TECHNOL BRANCH,DAHLGREN,VA 22448, USA. NR 13 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 24 PY 1993 VL 62 IS 21 BP 2670 EP 2672 DI 10.1063/1.109280 PG 3 WC Physics, Applied SC Physics GA LD123 UT WOS:A1993LD12300025 ER PT J AU SANTANGELO, PG NGAI, KL ROLAND, CM AF SANTANGELO, PG NGAI, KL ROLAND, CM TI DISTINCTIVE MANIFESTATIONS OF SEGMENTAL MOTION IN AMORPHOUS POLY(TETRAHYDROFURAN) AND POLYISOBUTYLENE SO MACROMOLECULES LA English DT Article ID VISCOELASTIC BEHAVIOR; NEUTRON-SCATTERING; ALPHA-RELAXATION; POLYMERS; DYNAMICS; CHAIN; LIQUIDS AB Polyisobutylene (PIB) and poly(tetrahydrofuran) (PTHF) exhibit segmental relaxation behavior that is distinctly different from that found for other amorphous polymers. These unusual properties include a segmental relaxation dispersion that is much broader when measured mechanically than as seen by other spectroscopic techniques, a relative insensitivity of the segmental relaxation time to temperature, a small ''steepness index'', and an absence of encroachment of the segmental modes in time scale toward the Rouse region as temperature is lowered. It is proposed herein that these phenomena are the result of the very low extent to which segmental relaxation in PIB and PTHF is constrained by nonbonded neighboring segments. This weak intermolecular coupling, deduced from quasi-elastic neutron scattering measurements, solid-state NMR spectroscopy, and the temperature dependence of the segmental relaxation time, arises from the smooth, symmetric, and flexible structure of the two polymers. C1 USN,WASHINGTON,DC 20375. NR 44 TC 62 Z9 63 U1 3 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAY 24 PY 1993 VL 26 IS 11 BP 2682 EP 2687 DI 10.1021/ma00063a007 PG 6 WC Polymer Science SC Polymer Science GA LD860 UT WOS:A1993LD86000007 ER PT J AU NGAI, KL ROLAND, CM AF NGAI, KL ROLAND, CM TI INTERMOLECULAR COOPERATIVITY AND THE TEMPERATURE-DEPENDENCE OF SEGMENTAL RELAXATION IN SEMICRYSTALLINE POLYMERS SO MACROMOLECULES LA English DT Article ID DIELECTRIC-RELAXATION; POLYPROPYLENE; POLYISOPRENE; LIQUIDS; CHAIN AB The effect of the presence of a crystalline phase on the temperature dependence of segmental relaxation is examined. For both an aromatic and an aliphatic polyester, for polypropylene, and for poly-(dimethylsiloxane) (PDMS), it is demonstrated that crystallinity has an insignificant effect on the temperature dependence of the segmental relaxation time when the temperature is normalized by the glass transition temperature, T(g), of the polymer. This allows the correlation between time and temperature dependencies of segmental relaxation, whereby more intermolecularly cooperative relaxations have a stronger dependence on T(g)-normalized temperature, to continue to be used to assess the intermolecular coupling strength in semicrystalline polymers. C1 USN,WASHINGTON,DC 20375. NR 35 TC 61 Z9 62 U1 1 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAY 24 PY 1993 VL 26 IS 11 BP 2688 EP 2690 DI 10.1021/ma00063a008 PG 3 WC Polymer Science SC Polymer Science GA LD860 UT WOS:A1993LD86000008 ER PT J AU REDDY, BV KHANNA, SN DUNLAP, BI AF REDDY, BV KHANNA, SN DUNLAP, BI TI GIANT MAGNETIC-MOMENTS IN 4D CLUSTERS SO PHYSICAL REVIEW LETTERS LA English DT Article ID BEHAVIOR; APPROXIMATIONS; PALLADIUM; SYMMETRY; COBALT; METALS; PD AB Electronic structure of 13-atom clusters of 4d nonmagnetic solids Pd, Rh, and Ru has been studied using a linear combination of atomic orbitals molecular-orbital approach within the density functional formalism. Pd13, Rh13, and Ru13 are all found to have nonzero magnetic moments. Unexpectedly, the ground state of Rh13 is found to have 21 unpaired electrons and thus a magnetic moment of 21 mu(B). These 4d-element magnetic moments are a result of the reduced dimensionality and the enhanced electronic degeneracy due to the symmetry of the cluster. The effect of impurities on the moments is examined through calculations on FePd12, FeRh12, RhPd12, and RuPd12 clusters. C1 USN, RES LAB, DIV CHEM, WASHINGTON, DC 20375 USA. RP VIRGINIA COMMONWEALTH UNIV, DEPT PHYS, RICHMOND, VA 23284 USA. OI Dunlap, Brett/0000-0003-1356-6559 NR 34 TC 327 Z9 334 U1 1 U2 13 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 MAY 24 PY 1993 VL 70 IS 21 BP 3323 EP 3326 DI 10.1103/PhysRevLett.70.3323 PG 4 WC Physics, Multidisciplinary SC Physics GA LC943 UT WOS:A1993LC94300037 ER PT J AU GANGULI, SB MITCHELL, HG PALMADESSO, PJ AF GANGULI, SB MITCHELL, HG PALMADESSO, PJ TI PLASMA DYNAMICS DRIVEN BY FINITE-WIDTH CURRENT FILAMENT AND KV POTENTIAL DROPS IN IONOSPHERE-MAGNETOSPHERE COUPLING SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID TRANSPORT; FIELDS AB We have simulated the plasma dynamics of a quasi-two-dimensional current filament in ionosphere-magnetosphere coupling. The simulation consists of a set of one-dimensional flux tube simulations with different imposed time-dependent, field-aligned currents. The dynamical interactions of the individual current filaments with the ionospheric and magnetospheric plasma generate kV field-aligned potential drops along the field lines, and the side-by-side display exhibits the evolution of the implied potential structure in the horizontal direction. The primary cross-field motion produced by the horizontal E-field (ExB drift) is perpendicular to both of the significant spatial directions, and is thus ignorable in this geometry. The effects of other cross-field drift processes axe discussed. The simulation thus provides insight into the dynamical evolution of 2D potential structures driven by an imposed finite-width field-aligned current profile. Spatial and temporal variation of other plasma parameters (temperatures, density, etc.) that are determined primarily by parallel transport effects axe also displayed. C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. USN,RES LAB,WASHINGTON,DC 20375. RP GANGULI, SB (reprint author), SCI APPLICAT INT CORP,1710 GOODRIDGE DR,MCLEAN,VA 22102, USA. NR 12 TC 9 Z9 9 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD MAY 21 PY 1993 VL 20 IS 10 BP 975 EP 978 DI 10.1029/93GL00848 PG 4 WC Geosciences, Multidisciplinary SC Geology GA LE448 UT WOS:A1993LE44800025 ER PT J AU WALKER, PL AF WALKER, PL TI MODIFICATION OF MONTE-CARLO CODES FOR USE WITH SHARPLY PEAKED PHASE FUNCTIONS SO APPLIED OPTICS LA English DT Note ID SCATTERED LIDAR RETURNS; CLOUDS AB Monte Carlo and approximate radiative transfer equation solutions predict different amounts of scattering for large aerosols. A new Monte Carlo scattering algorithm alleviates this discrepancy. RP WALKER, PL (reprint author), USN, POSTGRAD SCH, DEPT PHYS, MONTEREY, CA 93943 USA. NR 11 TC 4 Z9 4 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD MAY 20 PY 1993 VL 32 IS 15 BP 2730 EP 2733 PG 4 WC Optics SC Optics GA LC306 UT WOS:A1993LC30600011 PM 20820435 ER PT J AU VANDYK, SD SRAMEK, RA WEILER, KW PANAGIA, N AF VANDYK, SD SRAMEK, RA WEILER, KW PANAGIA, N TI THE RADIO-EMISSION FROM THE TYPE-IC SUPERNOVA SN-1990B SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, INDIVIDUAL (NGC-4568); RADIO CONTINUUM, STARS; SUPERNOVAE, INDIVIDUAL (SN-1990B) ID LARGE ARRAY; LIGHT CURVES; NUCLEOSYNTHESIS; REMNANTS; MODELS; NOVAE AB We present radio observations of the Type Ic ('' helium-poor '' Type Ib) supernova SN 1990B in NGC 4568 made with the Very Large Array at 20, 6, 3.6, and 2 cm from 1990 February through 1990 October. We find that its radio properties are quite similar to those of the two previously known Type Ib radio supernovae, SN 1983N and SN 1984L, and clearly distinguishable from the radio emission from Type II radio supernovae such as SN 1979C and SN 1986J. Nevertheless, there appear to be smaller, albeit significant, differences in the radio emission and physical properties of Type Ic from Type Ib radio supernovae. We discuss the radio properties of SN 1990B in the context of progenitor models for the Types Ib/c supernovae and conclude that an interacting binary system origin remains the most promising model. Finally, we suggest that Type Ib, and perhaps Ib/c, radio supernovae may form a class of radio '' standard candles '' which could be useful as distance indicators. C1 ESA,DEPT SPACE SCI,DIV ASTROPHYS,NOORDWIJK,NETHERLANDS. UNIV CATANIA,I-95124 CATANIA,ITALY. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. NATL RADIO ASTRON OBSERV,SOCORRO,NM 87801. RP VANDYK, SD (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,CODE 7215,WASHINGTON,DC 20375, USA. NR 38 TC 43 Z9 43 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 MAY 20 PY 1993 VL 409 IS 1 BP 162 EP 169 DI 10.1086/172652 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LB038 UT WOS:A1993LB03800016 ER PT J AU JUNG, TM KAPLAN, R PROKES, SM AF JUNG, TM KAPLAN, R PROKES, SM TI GA ON SI(112) - GROWTH AND ENERGETICS OF THERMAL-DESORPTION SO SURFACE SCIENCE LA English DT Letter ID BEAM EPITAXIAL-GROWTH; SI; SURFACES; SI(211); SI(100) AB The growth of Ga overlayers on Si(112) has been studied using Auger electron spectroscopy and low-energy electron diffraction. The feasibility of the (112) surface as a template for the growth of Ga quantum well wires is also explored. For substrate temperatures between room temperature and 450-degrees-C we observe the Stranski-Krastanov growth mode in which islands form on top of one to two overlayers. Above 450-degrees-C a well-ordered overlayer structure yielding a (6 x 1) LEED pattern is observed. Once this overlayer structure is formed there is little or no change in the AES signal or LEED pattern with increasing deposition. Thermal desorption measurements from this overlayer coverage reveal a much higher desorption energy than from either the Ga islands or from Ga on Si(111) and Si(001) substrates. These results suggest that the Ga atoms are strongly bound in chains along the step edges of the facet surface. RP JUNG, TM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 24 Z9 24 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAY 20 PY 1993 VL 289 IS 1-2 BP L577 EP L583 PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LE873 UT WOS:A1993LE87300001 ER PT J AU RAPPOLI, BJ MCGRATH, KJ GEORGE, CF COOPER, JC AF RAPPOLI, BJ MCGRATH, KJ GEORGE, CF COOPER, JC TI STABILITY OF THE SILICON RUTHENIUM BOND IN THE PRESENCE OF A STRONG NUCLEOPHILE - PHASE-SENSITIVE H-1-NMR COSY AND CRYSTAL-STRUCTURE OF RU(CO)2(NH2CH2C6H5)2(SI(C6H5)(CH3)2)I SO JOURNAL OF ORGANOMETALLIC CHEMISTRY LA English DT Article ID REACTIVITY AB The ruthenium(II) complex RU(CO)2(NH2(NH2CH2C6H5)2(Si(C6H5)(CH3)2)I has been prepared by the reaction of RU(CO)4(Si(C6H5)(CH3)2)I with benzylamine. Two-dimensional homonuclear H-1 NMR experiments examine the scalar coupling of the enantiotopic amino and methylene protons of the benzylamine ligand. X-ray analysis of Ru(CO)2(NH2CH2-C6H5)2(Si(C6H5)(CH3)2)I.1/3C5H12 (triclinic; P1BAR; a=14.266(4), b=15.748(5), c=20.082(6) angstrom; alpha=94.38(3), beta=96.30(2), gamma=101.52(2)-degrees) indicates three crystallographically unique complexes form a clathrate with a pentane guest. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP RAPPOLI, BJ (reprint author), USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375, USA. NR 28 TC 8 Z9 8 U1 1 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-328X J9 J ORGANOMET CHEM JI J. Organomet. Chem. PD MAY 18 PY 1993 VL 450 IS 1-2 BP 85 EP 89 DI 10.1016/0022-328X(93)80141-W PG 5 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA LH771 UT WOS:A1993LH77100013 ER PT J AU IDZERDA, YU GUTIERREZ, CJ TJENG, LH LIN, LJ MEIGS, G CHEN, CT AF IDZERDA, YU GUTIERREZ, CJ TJENG, LH LIN, LJ MEIGS, G CHEN, CT TI MAGNETIC CIRCULAR-DICHROISM OF FEXCO1-X ALLOY SINGLE-CRYSTAL THIN-FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. RP IDZERDA, YU (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5346 EP 5346 DI 10.1063/1.353726 PN 2A PG 1 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400015 ER PT J AU SAVAGE, HT CHEN, DX POLO, CG VAZQUEZ, M WUNFOGLE, M AF SAVAGE, HT CHEN, DX POLO, CG VAZQUEZ, M WUNFOGLE, M TI GIANT BARKHAUSEN EFFECTS WITH 2ND-ORDER INSTABILITY SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract C1 INST CIENCIA MAT,E-28006 MADRID,SPAIN. NSWC,SILVER SPRING,MD 20903. RP SAVAGE, HT (reprint author), UCM,RENFE,INST MAGNETISMO APLICADO,APARTADO 155,E-28230 MADRID,SPAIN. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5378 EP 5378 DI 10.1063/1.353736 PN 2A PG 1 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400026 ER PT J AU EHRLICH, AC GILLESPIE, DJ AF EHRLICH, AC GILLESPIE, DJ TI QUANTUM SIZE EFFECT AND THE GIANT MAGNETORESISTANCE IN MAGNETIC MULTILAYERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC ID VALENCE-ELECTRON STATES; OVERLAYERS; CU(111); AG AB A theoretical model which accounts for the variations of the giant magnetoresistance, DELTArho/rho, with electron mean free path, L, interface roughness, r, and magnetic, t(M), and normal layer, t(N), thickness has been previously presented for sandwich films. It employs the quantum-size-effect theory of resistivity in thin films and relies on spin dependent transmission or reflection at individual layer boundaries to establish the metallic quantum-well states. This model has now been extended (i) to films where L can be different in the magnetic, L(M), and nonmagnetic, L(N), layers, (ii) to an electron/atom number, n, of 0.131 as well as 1.047, and (iii) to films from sandwiches to those with as many as 64 (63) magnetic (nonmagnetic) layers. The focus is on films with relatively thin t(M) and t(N) where quantum, as distinguished from semiclassical, effects should dominate. Typical results can be summarized as follows: for t(M) approximately t(N) approximately 10 monolayers, ML, and L's approximately 70 ML, DELTArho/rho increases more rapidly as L(M) than L(N), but this effect is reduced as one goes from sandwiches to superlattices; DELTArho/rho is approximately 50% in a superlattice with r = 5 ML, which is an order of magnitude larger than in a superlattice with r = 1 ML. In a sandwich the difference between r = 5 and r = 1 is closer to a factor of 5. In the sandwiches DELTArho/rho is smaller for n = 0.131 than for n = 1.05. RP EHRLICH, AC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 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 MAY 15 PY 1993 VL 73 IS 10 BP 5536 EP 5538 DI 10.1063/1.353640 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400090 ER PT J AU RUBENSTEIN, M DAS, BN KOON, NC AF RUBENSTEIN, M DAS, BN KOON, NC TI PROPERTIES OF MELT-SPUN CO15FE5CU80, A BULK GRANULAR MAGNETIC SOLID SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract RP RUBENSTEIN, M (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 1 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5540 EP 5540 DI 10.1063/1.353642 PN 2A PG 1 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400092 ER PT J AU CHENG, SF SEGNAN, R CULLEN, JR CLARK, AE HUANG, MQ AF CHENG, SF SEGNAN, R CULLEN, JR CLARK, AE HUANG, MQ TI AMORPHIZATION OF TBFE3 BY NITROGEN ABSORPTION SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC ID INTERMETALLIC COMPOUNDS; FE AB The nitrogenation process of the TbFe3 intermetallic compound was studied by heat treating the alloy between 573 and 873 K in a nitrogen atmosphere. The structural and magnetic properties of the nitrogenated samples were characterized by x-ray diffraction (XRD), Mossbauer spectroscopy, and magnetic measurements. The magnetic moments of the nitrogenated samples were found to be a function of the annealing temperature and showed a minimum for the sample heat treated at 673 K. The XRD pattern of this sample (673 K) showed that the Bragg peaks of the 1-3 phase had completely disappeared and were replaced by a broad maximum indicating a breakdown of the TbFe3 Structure into an amorphous phase. The room-temperature Mossbauer spectrum of the same sample consisted almost entirely of a quadrupole-split doublet plus a small amount of alpha-Fe and TbFe3. This doublet split into a broad spectrum upon cooling which is typical of amorphous rare-earth-transition-metal compounds. For samples heat treated at higher temperatures, the amount of alpha-Fe and TbN phases gradually increased. This nitrogenation process is unlike that of R2Fe17. In this study, nitrogen atoms do not go into the interstitial sites. Instead, they create a ferromagnetic (T(C) almost-equal-to 215 K) amorphous phase of Th, Fe, and N which is stable over a wide temperature range. RP CHENG, SF (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 14 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5733 EP 5735 DI 10.1063/1.353607 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400165 ER PT J AU JONKER, BT PETERSON, LD KREBS, JJ AF JONKER, BT PETERSON, LD KREBS, JJ TI GROWTH AND CHARACTERIZATION OF A NEW DILUTED MAGNETIC SEMICONDUCTOR, ZN1-XEUXSE SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC ID MOLECULAR-BEAM EPITAXY; ZN1-XCOXSE AB The growth and initial characterization of a new II-VI-based diluted magnetic semiconductor compound that incorporates a rare-earth element, Zn1-xEuxSe, is reported. The samples were grown by molecular-beam epitaxy on GaAs(001) substrates using elemental source ovens. Reflection high-energy electron diffraction confirms single-crystal growth with an in-plane symmetry like that of the GaAs substrate, although the crystalline quality deteriorates with increasing epilayer thickness. Growth on a ZnSe buffer layer substantially improves the crystalline quality, suggesting that the lattice constant of the Zn1-xEuxSe is larger than that of GaAs. This is confirmed by x-ray theta - 2theta scans, which further show that the epilayers grow in a (001) orientation and retain the zinc-blende structure of the host lattice. Eu is expected to substitute for Zn as Eu2+ (4f7, S-8(7)/2 free ion) with an 8A1 ground state, an orbital singlet with a spin S = 7/2. Superconducting quantum interference device (SQUID) magnetometry data (2-150 K, 0-5 T) exhibit the temperature and field dependence characteristic of Brillouin paramagnetic behavior, consistent with substitutional incorporation. RP JONKER, BT (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Schaff, William/B-5839-2009 NR 13 TC 6 Z9 6 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 MAY 15 PY 1993 VL 73 IS 10 BP 5742 EP 5744 DI 10.1063/1.353610 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400168 ER PT J AU HARRIS, VG HELLMAN, F ELAM, WT KOON, NC AF HARRIS, VG HELLMAN, F ELAM, WT KOON, NC TI SUBSTRATE-TEMPERATURE EFFECT ON THE STRUCTURAL ANISOTROPY IN AMORPHOUS TB-FE FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC ID THIN-FILMS; DEPENDENCE AB Using extended x-ray absorption fine structures (EXAFS) measurements we have investigated the atomic environment around the Fe atom in a series of amorphous Tb0.26Fe0.74 films having different magnetic anisotropy energies owing to different deposition temperatures. The polarization properties of synchrotron radiation allowed the separate study of structure parallel and perpendicular to the sample plane. An anisotropy between these two structures was observed. Modeling results indicate this anisotropy is due to anisotropic pair correlations where the Fe-Fe pairs are statistically preferred in-plane and the Fe-Tb pairs out-of-plane. The amplitude of this anisotropy scales with both the substrate temperature and the magnetic anisotropy energy. A almost-equal-to 1% in-plane compression of the Fe-Fe distance was measured between the in-plane and out-of-plane structure of the sample grown at 77 K. This sample had no detectable local chemical anisotropy suggesting that intrinsic stress plays an important role in determining its magnetic anisotropy. C1 UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. RP HARRIS, VG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Harris, Vincent/A-8337-2009 NR 11 TC 14 Z9 14 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 MAY 15 PY 1993 VL 73 IS 10 BP 5785 EP 5787 DI 10.1063/1.353572 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400183 ER PT J AU KONNO, K IDO, H CHENG, SF SANKAR, SG WALLACE, WE AF KONNO, K IDO, H CHENG, SF SANKAR, SG WALLACE, WE TI AL-SUBSTITUTION EFFECTS ON THE MAGNETIC-PROPERTIES OF RCO5 (R=Y, PR, ND, AND SM) SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC ID CRYSTAL-FIELD ANALYSIS; RARE-EARTH AB Al substitution effects on the magnetic properties of RCo5 (R = Y, Pr, Nd, and Sm) are studied on the basis of magnetic measurements for RCo5-xAlx with x less than 2. The Al substitution considerably decreases the Curie temperature, the Co-sublattice moment, the magnetocrystalline anisotropy of the R sublattice as well as of the Co sublattice. The Co-sublattice moments in RCo5-xAlx have a different value depending on their directions in the crystal; in addition the rare earth moments are considerably smaller than the values of their free trivalent ions. The decrease of Co-sublattice moment with increasing content of Al can be explained by the rigid band model, and the properties of rare earth sublattices (or atoms) mentioned above seem to be explained by the exchange field at the rare earth site which weakens with increasing Al content. C1 USN,CTR SURFACE WEAP,SILVER SPRING,MD 20903. CARNEGIE MELLON UNIV,MELLON RES INST,PITTSBURGH,PA 15213. RP KONNO, K (reprint author), TOHOKU GAKUIN UNIV,DEPT APPL PHYS,TAGAJO 985,JAPAN. NR 12 TC 19 Z9 19 U1 0 U2 4 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 MAY 15 PY 1993 VL 73 IS 10 BP 5929 EP 5931 DI 10.1063/1.353524 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400239 ER PT J AU PAPPAS, DP WADDILL, GD TOBIN, JG AF PAPPAS, DP WADDILL, GD TOBIN, JG TI MAGNETIC DICHROISM IN CORE-LEVEL PHOTOEMISSION FROM FE/CU(100) FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC ID FCC-FE FILMS; CIRCULAR-DICHROISM; EPITAXIAL-FILMS; SURFACE; CU(100); CU AB Circularly polarized x rays from a synchrotron light source were used in photoemission from thin fcc Fe films on Cu(100). The measured exchange splitting for the 3s and 2p levels in these films is reduced from that measured in bulk bec Fe. For both the 2p3/2 and the 2p1/2 levels the splittings are about half that of bulk bcc Fe. This trend is in line with measurements of the 3s exchange splitting from fcc Fe compared to bcc Fe as well. A 0.25 eV exchange splitting is observed in the 3p core level. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP PAPPAS, DP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Tobin, James/O-6953-2015 NR 18 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5936 EP 5938 DI 10.1063/1.353527 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400242 ER PT J AU FILIPKOWSKI, ME GUTIERREZ, CJ KREBS, JJ PRINZ, GA AF FILIPKOWSKI, ME GUTIERREZ, CJ KREBS, JJ PRINZ, GA TI TEMPERATURE-DEPENDENCE OF THE 90-DEGREES COUPLING IN FE/AL/FE(001) MAGNETIC TRILAYERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC AB The temperature dependence of the unusual magnetic 90-degrees coupling in epitaxial Fe/Al/Fe(001) trilayers has been determined. For specific values of applied field and temperature, in-plane anisotropy and the interlayer coupling drive abrupt first-order changes in the temperature-dependent moment of these trilayers. The occurrence of such a first-order transition can be used to determine the value of the interlayer coupling constant, J(Q), at the transition temperature. We show that Fe/Al/Fe(001) trilayers also exhibit distinct second-order transitions in the temperature-dependent moment, and that the occurrence of a second-order transition can similarly be used to specify J(Q)(T). A comparison is made of the values of J(Q)(T) determined by these two approaches, and the dependence of J(Q) on T is analyzed. RP FILIPKOWSKI, ME (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 5 TC 30 Z9 30 U1 1 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 MAY 15 PY 1993 VL 73 IS 10 BP 5963 EP 5965 DI 10.1063/1.353484 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400250 ER PT J AU ERICKSON, RP CULLEN, JR AF ERICKSON, RP CULLEN, JR TI SURFACE-ROUGHNESS AND LONG-RANGE ORDER OF A SEMIINFINITE FERROMAGNET SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX SP AMER INST PHYS, IEEE, MAGNET SOC ID MAGNETISM; FILMS AB We consider the effect of random surface roughness on a semi-infinite ferromagnetic film. We calculate the magnetization as a function of distance from the surface and the spin-spin correlation as a function of lateral separation. We show that, even in the absence of crystalline anisotropy or an external field, the surface of the ferromagnet is stable against random torques created by the roughness. Near the surface, the magnetization reduction is inversely proportional to the square of a ''healing'' length lambda0 = (D/2piM0)1/2, where D is an exchange stiffness and M0 is the saturation magnetization. The correlations in fluctuations of the magnetization orientation der-ay exponentially with distance parallel to the surface, lambda0 being in the exponent. In contrast, fluctuations decrease only as the reciprocal of the square of the distance perpendicular to the surface. Results are discussed and compared with other calculations of the effects of random surface perturbations. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. RP ERICKSON, RP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 1 Z9 1 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 5981 EP 5983 DI 10.1063/1.353490 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400256 ER PT J AU JONKER, BT FU, LP YU, WY CHOU, WC PETROU, A WARNOCK, J AF JONKER, BT FU, LP YU, WY CHOU, WC PETROU, A WARNOCK, J TI SPIN LIFETIMES IN DILUTED MAGNETIC SEMICONDUCTOR SPIN SUPERLATTICES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID INDUCED TYPE-I->TYPE-II TRANSITION; QUANTUM-WELLS; CD1-XMNXTE; RELAXATION AB The growth of spin superlattice structures in which spin-up and spin-down carriers occupy alternating layers in the structure has recently been reported. We report here measurements of electron and hole spin lifetimes and spin relaxation processes. In dc photoluminescence spectra, both the higher-energy (+1/2,+3/2) and lower-energy (-1/2,-3/2) heavy-hole exciton interband transitions are observed, even though it would be energetically favorable for the spin-up carriers to first relax to the spin-down state before radiative recombination. From the field dependence of the intensity ratios of these components and a rate equation model, we determine the heavy hole tau(hs) and electron tau(es) spin lifetimes relative to the radiative lifetime tau(r), with tau(hs)/tau(r) almost-equal-to 4.5 and tau(es)/tau(r) almost-equal-to 0.08, so that the heavy-hole spin lifetime is almost-equal-to 50 times longer than that of the electron. This is attributed to the strain-induced splitting of the heavy- and light-hole bands, which prevents fast spin relaxation of the holes. C1 SUNY Buffalo, BUFFALO, NY 14260 USA. IBM CORP, THOMAS J WATSON RES CTR, YORKTOWN HTS, NY 10598 USA. RP JONKER, BT (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 17 TC 7 Z9 7 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 6051 EP 6053 DI 10.1063/1.353466 PN 2A PG 3 WC Physics, Applied SC Physics GA LD854 UT WOS:A1993LD85400286 ER PT J AU CLARK, AE RESTORFF, JB WUNFOGLE, M LINDBERG, JF AF CLARK, AE RESTORFF, JB WUNFOGLE, M LINDBERG, JF TI MAGNETOELASTIC COUPLING AND DELTA-E EFFECT IN TBXDY1-X SINGLE-CRYSTALS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX ID MAGNETOSTRICTION AB The elastic moduli of the highly magnetostrictive TbxDy1-x alloys (x =0.5, 0.6, and 0.67) were measured at 77 K under conditions of constant magnetic field and constant magnetic induction. From these values the magnetic contribution to the moduli (intrinsic DELTAE effect) and magnetoelastic coupling factor k were calculated. For Young's moduli measured under constant flux density (magnetically blocked conditions), it was found that E(B) approximately 20 to 50 GPa. For measurements made while maintaining a constant magnetic field (magnetically free conditions), it was found that Young's moduli E(H) minima range from approximately 3 to 5 GPa. Such large differences between E(B) and E(H) yield magnetoelastic coupling factors in excess of 0.9. Theoretical expressions of the magnetic contribution to the elastic compliance, (1/E(H) - 1/E(B)), were derived using the single vector magnetization rotation model. C1 USN,CTR UNDERSEA WARFARE,NEW LONDON,CT 06320. RP CLARK, AE (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 5 TC 16 Z9 16 U1 1 U2 4 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 MAY 15 PY 1993 VL 73 IS 10 BP 6150 EP 6152 DI 10.1063/1.352732 PN 2B PG 3 WC Physics, Applied SC Physics GA LD865 UT WOS:A1993LD86500002 ER PT J AU ALJIBOORY, M LORD, DG BI, YJ ABELL, JS HWANG, AMH TETER, JP AF ALJIBOORY, M LORD, DG BI, YJ ABELL, JS HWANG, AMH TETER, JP TI MAGNETIC DOMAINS AND MICROSTRUCTURAL DEFECTS IN TERFENOL-D SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX ID MAGNETOSTRICTION; CRYSTALS AB The ternary alloy Tb0.3Dy0.7Fe2 (Terfenol-D) is of significant technological interest as it possesses the largest known magnetostriction to anisotropy ratio near room temperature. Results of microstructural and magnetic domain observations by Lorentz microscopy and reflection x-ray topography are presented from both stoichiometric twinned single crystals prepared by a free-standing zoning technique, and pseudo single crystals prepared by the Czochralski method. Direct evidence of wall interactions with dislocations, twin boundaries and precipitates are presented which demonstrate the complex interaction between the magnetic and strain energies within this material. C1 UNIV BIRMINGHAM,SCH MET & MAT,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. RP ALJIBOORY, M (reprint author), UNIV SALFORD,DEPT PHYS,SALFORD M5 4WT,LANCS,ENGLAND. NR 9 TC 22 Z9 22 U1 1 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 6168 EP 6170 DI 10.1063/1.352738 PN 2B PG 3 WC Physics, Applied SC Physics GA LD865 UT WOS:A1993LD86500008 ER PT J AU LIU, AY SINGH, DJ AF LIU, AY SINGH, DJ TI BCC COBALT - METASTABLE PHASE OR FORCED STRUCTURE SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX ID ELECTRONIC-STRUCTURE; MAGNETIC-PROPERTIES; BAND THEORY; CO; GROWTH; FILMS AB General potential linearized augmented plane wave calculations of the elastic and magnetic properties of body-centered-cubic (bcc) Co are presented and discussed. Particular attention is given to the nature of the stability of bcc Co films that have been grown epitaxially on GaAs substrates. The bcc structural phase of Co, which is not found in nature, is calculated to be unstable with respect to a tetragonal distortion that transforms it continuously into the face-centered-cubic (fcc) phase. This means that bcc Co is not a true metastable phase of bulk Co. The thinner films of bcc Co that have been synthesized are more properly termed forced structures. We speculate that the few existing thick (up to 357 angstrom) samples of bcc Co are stabilized by the presence of impurities or other defects. This is further supported by discrepancies between the measured and calculated magnetic moments in bcc Co. RP LIU, AY (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012; Liu, Amy/E-2266-2015 OI Liu, Amy/0000-0002-2011-1854 NR 23 TC 28 Z9 28 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 MAY 15 PY 1993 VL 73 IS 10 BP 6189 EP 6191 DI 10.1063/1.352693 PN 2B PG 3 WC Physics, Applied SC Physics GA LD865 UT WOS:A1993LD86500017 ER PT J AU IDZERDA, YU TJENG, LH LIN, HJ MEIGS, G CHEN, CT GUTIERREZ, J AF IDZERDA, YU TJENG, LH LIN, HJ MEIGS, G CHEN, CT GUTIERREZ, J TI MAGNETIC-STRUCTURE OF FE/CR/FE TRILAYERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX ID ELECTRONIC-STRUCTURE; FE LAYERS; CIRCULAR-DICHROISM; CR; SUPERLATTICES; EXCHANGE; NICKEL; MAGNETORESISTANCE; SPECTRUM; IRON AB The magnetic structure of Cr films deposited on single crystal Fe(001)/GaAs(001) substrates is investigated by soft x-ray magnetic circular dichroism (SXMCD) of the L2 and L3 absorption edges. We find that 0.25 ML Cr coverages result in Cr moments aligned with each other and antialigned to the underlying Fe moment direction. The Cr moment is measured to be 0.6 +/- 0.2 mu(B). Additional Cr deposition results in a monotonically reducing averaged moment consistent with the island growth of ferromagnetic Cr sheets of a single layer, antialigned with adjoining sheets. SXMCD measurements of the trilayer structures clearly show the antiferromagnetic coupling of the two Fe films through the interlying Cr film. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. SW TEXAS STATE UNIV,DEPT PHYS,SAN MARCOS,TX 78666. RP IDZERDA, YU (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 31 TC 15 Z9 15 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 MAY 15 PY 1993 VL 73 IS 10 BP 6204 EP 6206 DI 10.1063/1.352698 PN 2B PG 3 WC Physics, Applied SC Physics GA LD865 UT WOS:A1993LD86500022 ER PT J AU WILLIAMS, CM CHRISEY, DB LUBITZ, P GRABOWSKI, KS AF WILLIAMS, CM CHRISEY, DB LUBITZ, P GRABOWSKI, KS TI THE MAGNETIC AND STRUCTURAL-PROPERTIES OF PULSED-LASER DEPOSITED EPITAXIAL MN1-XZNXFE2O4 FERRITE FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract RP WILLIAMS, CM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 2 Z9 2 U1 1 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 MAY 15 PY 1993 VL 73 IS 10 BP 6312 EP 6312 DI 10.1063/1.352681 PN 2B PG 1 WC Physics, Applied SC Physics GA LD865 UT WOS:A1993LD86500059 ER PT J AU TONDRA, M LOTTIS, DK RIGGS, KT CHEN, YJ DAHLBERG, ED PRINZ, GA AF TONDRA, M LOTTIS, DK RIGGS, KT CHEN, YJ DAHLBERG, ED PRINZ, GA TI THICKNESS DEPENDENCE OF THE ANISOTROPIC MAGNETORESISTANCE IN EPITAXIAL IRON FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX ID GAAS AB The anisotropic magnetoresistance (AMR) has been measured at room temperature on a series of epitaxial iron films of various thicknesses. Seven of the films range in thickness from 5 to 20 nm, and one is 500 nm thick. The resistivity of the films was measured with current along photolithographically defined paths parallel to three directions of high symmetry in the single crystal films ([001], [110], and [111]). It was determined that the magnitude of the AMR depends upon the direction the current is applied and that this directional dependence increases with film thickness until saturating near 20 nm. The AMR is roughly 0.15% for all crystal directions in the thinnest films, while in the thickest film, the AMR is 0.08% with current along the [001] direction, 0.35% along the [110] direction, and 0.51% along the [111] direction. These values are to be compared with the AMR of bulk polycrystalline iron which is 0.2%; a weighted ;average over the different crystallographic directions. C1 USN,RES LAB,WASHINGTON,DC 20375. RP TONDRA, M (reprint author), UNIV MINNESOTA,SCH PHYS & ASTRON,116 CHURCH ST SE,MINNEAPOLIS,MN 55455, USA. NR 13 TC 13 Z9 13 U1 1 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 6393 EP 6395 DI 10.1063/1.352607 PN 2B PG 3 WC Physics, Applied SC Physics GA LD865 UT WOS:A1993LD86500092 ER PT J AU KREBS, JJ LIND, DM BERRY, SD AF KREBS, JJ LIND, DM BERRY, SD TI FERROMAGNETIC-RESONANCE AND SPIN ANISOTROPY IN IRON-OXIDE THIN-FILMS AND IRON-OXIDE NICKEL-OXIDE SUPERLATTICES SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX ID MOLECULAR-BEAM EPITAXY AB Oriented single-crystalline thin films of Fe3O4 and superlattices of Fe3O4/NiO have been grown using molecular-beam-epitaxy techniques on polished substrates of MgO(001). The 1-2-mum-thick superlattices have their Fe3O4 layer thicknesses held constant at 68 angstrom and the NiO thickness varied from 8.5 to 102 angstrom. We report the initial ferromagnetic resonance measurements made on these samples to investigate the effects that interfacial lattice distortion and interlayer coupling have on their magnetic ordering and anisotropy. These results are compared with structural and magnetic studies made on the same films using x-ray diffraction and magnetometry techniques. We find clear evidence in the trends of both the ferromagnetic resonance fields and the linewidths as a function of NiO thickness that coupling between the layers can change the in-plane anisotropy and the overall magnetic response. The single-layer Fe3O4-only sample behaves essentially like bulk magnetite. C1 FLORIDA STATE UNIV,CTR MAT RES,TALLAHASSEE,FL 32306. FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306. RP KREBS, JJ (reprint author), USN,WASHINGTON,DC 20375, USA. NR 7 TC 23 Z9 23 U1 3 U2 7 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 MAY 15 PY 1993 VL 73 IS 10 BP 6457 EP 6459 DI 10.1063/1.352632 PN 2B PG 3 WC Physics, Applied SC Physics GA LD865 UT WOS:A1993LD86500117 ER PT J AU WADDILL, GD TOBIN, JG PAPPAS, DP AF WADDILL, GD TOBIN, JG PAPPAS, DP TI MAGNETIC-X-RAY DICHROISM IN 2P ABSORPTION-SPECTRA OF FE/CU(001) SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX ID FCC-FE; FILMS; CU(100); TRANSITION; SURFACE; BCC; CO; NI AB Large magnetic circular dichroism using circularly polarized synchrotron radiation has been observed at the L2,3 absorption edges of thin ( 1-12 monolayers) fcc Fe films grown on Cu(001). Dramatic changes in the 2p branching ratio are observed when the orientation of photon helicity and sample magnetization are varied from parallel to antiparallel. The temperature and film thickness dependence of the perpendicular anisotropy in these films could be monitored by variations in the 2p branching ratio. Finally, our results are described in a simple theoretical framework that allows a determination between the predicted low- and high-spin phases for fcc Fe. Our data suggest a high-spin phase with a moment of 2.0-2.5 mu(B)/atom. Interestingly, thicker films with remanant magnetic moments in the film plane present smaller branching ratio variations consistent with either a reduced moment or with domain closure for these films. The surface sensitivity and elemental specificity of this technique make it particularly attractive for the study of surface and thin film magnetism. C1 USN,RES LAB,WASHINGTON,DC 20375. RP WADDILL, GD (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,POB 808,LIVERMORE,CA 94550, USA. RI Tobin, James/O-6953-2015 NR 29 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 6748 EP 6750 DI 10.1063/1.352524 PN 2B PG 3 WC Physics, Applied SC Physics GA LD865 UT WOS:A1993LD86500225 ER PT J AU GUTIERREZ, CJ HARRIS, VG KREBS, JJ ELAM, WT PRINZ, GA AF GUTIERREZ, CJ HARRIS, VG KREBS, JJ ELAM, WT PRINZ, GA TI MAGNETIC AND STRUCTURAL CHARACTERISTICS OF EPITAXIAL FEXCO1-X ALLOY-FILMS ON ZNSE(001) SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 37TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY DEC 01-04, 1992 CL HOUSTON, TX ID MOLECULAR-BEAM EPITAXY; ELECTRONIC-STRUCTURE; BCC CO AB Ferromagnetic alloy films of bcc FexCo1-x(001) were epitaxially grown on ZnSe-epilayered GaAs substrates spanning both the thermodynamically allowed bcc regime (0.25 < x less-than-or-equal-to 1) and the epitaxy-extended metastable bcc regime (0 less-than-or-equal-to x less-than-or-equal-to 0.25). Conversion-electron extended x-ray absorption fine-structure (EXAFS) and reflection high-energy electron-diffraction (RHEED) measurements verify that metastable bcc FexCo1-x films with 0 less-than-or-equal-to x less-than-or-equal-to 0.25 are stabilized by epitaxy on ZnSe. Additionally, the composition-dependent magnetic properties of these films were characterized by ferromagnetic resonance and vibrating sample magnetometry. C1 USN,RES LAB,WASHINGTON,DC 20375. RI Harris, Vincent/A-8337-2009 NR 19 TC 8 Z9 8 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1993 VL 73 IS 10 BP 6763 EP 6765 DI 10.1063/1.352478 PN 2B PG 3 WC Physics, Applied SC Physics GA LD865 UT WOS:A1993LD86500230 ER PT J AU NYSTUEN, JA ANDRADE, CA AF NYSTUEN, JA ANDRADE, CA TI TRACKING MESOSCALE OCEAN FEATURES IN THE CARIBBEAN SEA USING GEOSAT ALTIMETRY SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID CIRCULATION; VARIABILITY; CURRENTS AB Geosat Exact Repeat Mission (ERM) altimetry data, collected during 1987-1988 over the Caribbean Sea, are used to detect and track the movement of mesoscale sea surface height anomalies. Along-track derivatives are used to estimate the mean sea surface height. Contour maps of sea surface height (SSH) anomaly are generated for each 17-day exact repeat period. Two anticyclonic features are observed during April-July, one each year, with SSH signatures that reached +30 cm. These features initially are observed near the Beata Ridge and propagate westward with an average speed of 15 cm/s. No mesoscale anomalies associated with the Caribbean Current are apparent during other seasons. The formation of the anticyclones coincides with the seasonal increase to maximum wind stress curl and water transport in the central Caribbean. A quasi-permanent cyclonic eddy is detected near the southwestern portion of the Colombian Basin, confirming model predictions. RP NYSTUEN, JA (reprint author), USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943, USA. NR 16 TC 18 Z9 18 U1 1 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD MAY 15 PY 1993 VL 98 IS C5 BP 8389 EP 8394 DI 10.1029/93JC00125 PG 6 WC Oceanography SC Oceanography GA LC974 UT WOS:A1993LC97400002 ER PT J AU GALLEGOS, SC HAWKINS, JD CHENG, CF AF GALLEGOS, SC HAWKINS, JD CHENG, CF TI A NEW AUTOMATED-METHOD OF CLOUD MASKING FOR ADVANCED VERY HIGH-RESOLUTION RADIOMETER FULL-RESOLUTION DATA OVER THE OCEAN SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID SPATIAL-RESOLUTION; CLASSIFICATION; IMAGERY; COVER AB This paper reports on a new algorithm to remove cloud-contaminated pixels from daytime and nighttime -km advanced very high resolution radiometer (AVHRR) data. The technique was developed in response to Navy needs to efficiently and accurately eliminate cloud contaminated pixels from real-time satellite digital images. The remaining ''cloud free'' sea surface temperature (SST) pixels would be available for analysts to utilize in tracking ocean mesoscale fronts and eddies as well as input to SST and ocean thermal analysis. Initial poor results with existing cloud-masking techniques led to this effort. The method uses a series of approaches to locate cloud-contaminated pixels which include (1) use of multiple bands to detect signatures not readily available from single-channel data, (2) extraction of cloud edge information through local segmentation of the image using the cluster shade texture measure based on the gray level cooccurrence (GLC) matrix and, (3) discrimination of cloud-free from cloud-contaminated regions with an area labeling procedure. This technique is evaluated on identical data sets utilizing other experimental and operational cloud algorithms and cloud masks produced through human interpretation. This method, tested over a wide range of conditions and geographical locations, produces accurate and efficient daytime and nighttime SST data sets. C1 SVERDRUP TECHNOL INC,BAY ST LOUIS,MS 39529. RP GALLEGOS, SC (reprint author), USN,RES LAB,REMOTE SENSING BRANCH,BAY ST LOUIS,MS 39529, USA. NR 16 TC 8 Z9 8 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD MAY 15 PY 1993 VL 98 IS C5 BP 8505 EP 8516 DI 10.1029/93JC00100 PG 12 WC Oceanography SC Oceanography GA LC974 UT WOS:A1993LC97400012 ER PT J AU NAYERSINA, R FOWLER, P GUILHOT, S MISSALE, G CERNY, A SCHLICHT, HJ VITIELLO, A CHESNUT, R PERSON, JL REDEKER, AG CHISARI, FV AF NAYERSINA, R FOWLER, P GUILHOT, S MISSALE, G CERNY, A SCHLICHT, HJ VITIELLO, A CHESNUT, R PERSON, JL REDEKER, AG CHISARI, FV TI HLA A2 RESTRICTED CYTOTOXIC T-LYMPHOCYTE RESPONSES TO MULTIPLE HEPATITIS-B SURFACE-ANTIGEN EPITOPES DURING HEPATITIS-B VIRUS-INFECTION SO JOURNAL OF IMMUNOLOGY LA English DT Article ID RECOMBINANT VACCINIA VIRUS; NUCLEOCAPSID ANTIGEN; ESCHERICHIA-COLI; CELLS; DNA; RECOGNIZE; PEPTIDES; PROTEINS; MICE AB Inasmuch as the hepatitis B virus (HBV) is not directly cytopathic for the infected hepatocyte, it is generally presumed that viral clearance and liver cell injury during viral hepatitis are due to a CTL response to HBV encoded Ag presented by HLA class I molecules. We have previously examined the peripheral blood CTL response to two HBV nucleocapsid epitopes in patients with acute and chronic viral hepatitis, one of which is restricted by HLA-A2, whereas the other is dually restricted by HLA-A3] and Aw68. In this study, we defined the HLA-A2-restricted CTL response to the hepatitis B surface Ag (HBsAg) by using a panel of HBsAg-derived synthetic peptides containing the ideal HLA-A2.1 binding motif (-L------V). Several novel aspects of HBV immunobiology and pathogenesis are evident from this study. First, the peripheral blood CTL response to HBV-encoded Ag is remarkably polyclonal and multispecific in most patients with acute hepatitis. Indeed, HLA-A2-restricted CTL specific for as many as four envelope epitopes and one nucleocapsid epitope were found to be present simultaneously in individual patients with acute viral hepatitis. Second, HBV-specific CTL are not detectable in the peripheral blood in a minority of patients with acute hepatitis, nor have we detected a CTL response in any of the patients with chronic hepatitis that we have studied thus far. Although the cellular and molecular basis for CTL nonresponse remains to be determined, the data suggest that it may contribute to viral persistence. Third, the diversity and the specificity of the CTL response is determined in part by the coding sequence of the viral genome present in each infected patient. Indeed, the apparent nonresponse of some acutely infected patients to at least one HBsAg-specific CTL epitope actually reflects infection by a viral variant that contains a critical substitution in one of the anchor residues within the epitope. Finally, at a fundamental level, the data suggest that the presence of the HLA-A2.1-binding motif in a peptide may not be sufficient for binding; and the capacity of a peptide to bind the class I molecule does not guarantee that it will be immunogenic. C1 SCRIPPS RES INST, DEPT MOLEC & EXPTL MED, LA JOLLA, CA 92037 USA. UNIV ULM, DEPT VIROL, W-7900 ULM, GERMANY. CYTEL CORP, DEPT IMMUNOL, SAN DIEGO, CA 92121 USA. USN HOSP, DIV GASTROENTEROL, SAN DIEGO, CA 92134 USA. UNIV SO CALIF, LOS ANGELES CTY MED CTR, DIV GASTROENTEROL, LOS ANGELES, CA 90033 USA. RI Chisari, Francis/A-3086-2008; Missale, Gabriele/J-6083-2016; OI Missale, Gabriele/0000-0001-6691-8701; Chisari, Francis/0000-0002-4832-1044 FU NCRR NIH HHS [RR00833]; NIAID NIH HHS [AI20001] NR 28 TC 278 Z9 295 U1 0 U2 3 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD MAY 15 PY 1993 VL 150 IS 10 BP 4659 EP 4671 PG 13 WC Immunology SC Immunology GA LB650 UT WOS:A1993LB65000050 PM 7683326 ER PT J AU AGASSI, D BARDO, RD AF AGASSI, D BARDO, RD TI PINNING PROPERTIES OF A DISORDERED PLANAR DEFECT SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article ID GRAIN-BOUNDARIES; SUPERCONDUCTORS; BICRYSTALS AB The effects of penetration depth fluctuations in a disordered-regular superconducting junction are evaluated in the London limit. This configuration demonstrates a disorder-proximity effect: the disorder on the one side of the junction induces pinning potential fluctuations on the other side which penetrate a distance of the order of the penetration depth into the regular side. The associated correlation functions and critical currents are calculated and discussed. RP USN, CTR SURFACE WEAP, DIV DAHLGREN, WHITE OAK DETACHMENT, SILVER SPRING, MD 20903 USA. NR 28 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 EI 1873-2143 J9 PHYSICA C JI Physica C PD MAY 15 PY 1993 VL 210 IS 1-2 BP 114 EP 126 DI 10.1016/0921-4534(93)90015-I PG 13 WC Physics, Applied SC Physics GA LE084 UT WOS:A1993LE08400013 ER PT J AU AGASSI, D BARDO, RD AF AGASSI, D BARDO, RD TI FLUX-PINNING AND CRITICAL CURRENTS IN A DISORDERED GRAIN-BOUNDARY MODEL SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article ID YBA2CU3O7-X THIN-FILMS; BEHAVIOR; SUPERCONDUCTORS; BICRYSTALS AB The pinning potential and critical currents of a S-S'-S junction with a slab geometry, in the presence of penetration depth fluctuations in S', are evaluated in the London limit. This junction serves as a model for flux pinning grain boundaries. Disorder induced pinning is found to extend into the S domains over a distance comparable to the penetration depth. For ''realistic'' parameters, the calculated critical currents have a weak dependence on the grain boundary misalignment angle and high values. Comparison with relevant data is discussed. RP USN, CTR SURFACE WEAP, DAHLGREN DIV, WHITE OAK DETACHMENT, SILVER SPRING, MD 20903 USA. NR 29 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 EI 1873-2143 J9 PHYSICA C JI Physica C PD MAY 15 PY 1993 VL 210 IS 1-2 BP 127 EP 132 DI 10.1016/0921-4534(93)90016-J PG 6 WC Physics, Applied SC Physics GA LE084 UT WOS:A1993LE08400014 ER PT J AU HELLIWELL, TM KONKOWSKI, DA AF HELLIWELL, TM KONKOWSKI, DA TI TESTING A STABILITY CONJECTURE FOR CAUCHY HORIZONS SO PHYSICAL REVIEW D LA English DT Article ID CHARGED BLACK-HOLE; QUASIREGULAR SINGULARITIES; SCALAR PERTURBATIONS; MASS-INFLATION; COSMOLOGIES; INSTABILITY; SPACETIME; EVOLUTION; INTERIOR AB A stability conjecture previously developed to investigate quasiregular and nonscalar curvature singularities is extended here to cover the stability of Cauchy horizons. In particular, the Reissner-Nordstrom spacetime of charged, nonrotating black holes is considered. The conjecture predicts that the addition of infalling null dust with a power-law tail will produce a nonscalar curvature singularity at the Cauchy horizon. This prediction is verified using a Reissner-Nordstrom-Vaidya spacetime studied by Hiscock. The conjecture also predicts that a combination of infalling and outgoing null dust will produce a scalar curvature singularity at the Cauchy horizon. This prediction is verified using the mass inflation results of Poisson and Israel. Finally, the conjecture predicts that the addition of infalling scalar or electromagnetic waves will produce a scalar curvature singularity at the Cauchy horizon. C1 USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402. RP HELLIWELL, TM (reprint author), HARVEY MUDD COLL,DEPT PHYS,CLAREMONT,CA 91711, USA. NR 26 TC 17 Z9 17 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD MAY 15 PY 1993 VL 47 IS 10 BP 4322 EP 4327 DI 10.1103/PhysRevD.47.4322 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA LE326 UT WOS:A1993LE32600024 ER PT J AU JONES, WH BARDO, RD AF JONES, WH BARDO, RD TI THEORETICAL PREDICTION OF A POLYCYCLIC MODIFICATION OF POLYTHIAZYL - A NEW MOLECULAR SUPERCONDUCTOR SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID POLYMERIC SULFUR NITRIDE; TETRASULFUR DINITRIDE; CRYSTAL-STRUCTURE; GROUND-STATES; (SN)X; NITROGEN; CARBON; S2N2; SET AB MNDO and AM1 calculations indicate that polythiazyl, (SN)x, could, under high pressure, undergo exothermic formation of a polycyclic (SNNS)x. The methods give satisfactory geometries for the known S3N3-, S3N2Cl+, S3N2, and S4N2 and a heat of formation in reasonable agreement with the ''experimental'' value for S4N4(g). In (SNNS)x the nearest-neighbor S-S distances and the S to N charge transfer are reduced relative to (SN)x, and the S atoms are linearly disposed. Studies of three model compounds suggest that decomposition of the polymer would be initiated by scission of N-S bonds and that its kinetic stability would be comparable with that of polythiazyl. Although no specific mechanism for superconductivity in these materials is introduced here, an analysis of the high-pressure behavior of (SN)x suggests the possibility that because (SNNS)x would have a more rigid chain, a shorter S-S intrachain distance, and a lesser charge transfer from S to N than (SN)x, the superconducting T(c) of a sufficiently long structure for (SNNS)x could exceed that for compressed semimetallic (SN)x which, at present, is the only empirically known, undoped polymer which becomes superconducting. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. RP JONES, WH (reprint author), UNIV W FLORIDA,DEPT CHEM,11000 UNIV PKWY,PENSACOLA,FL 32514, USA. NR 36 TC 4 Z9 4 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 13 PY 1993 VL 97 IS 19 BP 4974 EP 4983 DI 10.1021/j100121a020 PG 10 WC Chemistry, Physical SC Chemistry GA LB803 UT WOS:A1993LB80300020 ER PT J AU GOLDBERG, L SURETTE, MR MEHUYS, D AF GOLDBERG, L SURETTE, MR MEHUYS, D TI FILAMENT FORMATION IN A TAPERED GAALAS OPTICAL AMPLIFIER SO APPLIED PHYSICS LETTERS LA English DT Article ID LASER AB Filament formation in a tapered GaAlAs amplifier with an output width of 320 mum is characterized by injecting an input beam with a superimposed sinusoidal intensity modulation (30 mum period, 30% peak-to-peak modulation). Strong seeded filamentation of the output near field, and large far field side lobes are observed for powers above approximately 1 W. Time dependent decay of the main far field lobe, characterized by a time constant of several microseconds, is used to separate the effects of localized carrier density variations from the thermal contribution to intensity and phase distortion of the output beam. C1 SPECTRA DIODE LABS,SAN JOSE,CA 95134. RP GOLDBERG, L (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 45 Z9 46 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 10 PY 1993 VL 62 IS 19 BP 2304 EP 2306 DI 10.1063/1.109399 PG 3 WC Physics, Applied SC Physics GA LA797 UT WOS:A1993LA79700002 ER PT J AU EDDY, CR DOBISZ, EA HOFFMAN, CA MEYER, JR AF EDDY, CR DOBISZ, EA HOFFMAN, CA MEYER, JR TI NANOMETER-SCALE FABRICATION IN MERCURY CADMIUM TELLURIDE USING METHANE HYDROGEN ELECTRON-CYCLOTRON-RESONANCE MICROWAVE PLASMAS SO APPLIED PHYSICS LETTERS LA English DT Article AB The fabrication of nanometer scale features in the narrow gap, compound semiconductor mercury cadmium telluride has been demonstrated through the application of e-beam lithography and reactive ion etching with an electron cyclotron resonance (ECR) microwave generated methane/hydrogen plasma. The effects of methane concentration, substrate bias, total pressure, and substrate position with respect to the ECR condition on etch rate, anisotropy, and overall etch performance have been examined. The optimized process resulting from these studies has produced the first mercury-based nanostructures consisting of 30-60 nm features with sidewall angles of 88-degrees. RP EDDY, CR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 21 Z9 21 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 10 PY 1993 VL 62 IS 19 BP 2362 EP 2364 DI 10.1063/1.109390 PG 3 WC Physics, Applied SC Physics GA LA797 UT WOS:A1993LA79700022 ER PT J AU KIM, YD COOPER, SL KLEIN, MV JONKER, BT AF KIM, YD COOPER, SL KLEIN, MV JONKER, BT TI OPTICAL CHARACTERIZATION OF PURE ZNSE FILMS GROWN ON GAAS SO APPLIED PHYSICS LETTERS LA English DT Article ID INTERBAND CRITICAL-POINTS; TEMPERATURE-DEPENDENCE AB We report the first spectroscopic ellipsometry study of the E0, E0+DELTA0, E1, and E1+DELTA1 critical points in high-quality ZnSe films. These data seem to be the best identification of E1 and E1+DELTA1 peaks to date using ellipsometry. We also describe a chemical etching procedure which was successfully used to remove the natural surface oxide overlayer on the ZnSe films. X-ray photoelectron spectroscopy data after NH4OH treatment shows the disappearance of oxygen and oxidized Se peaks demonstrating the successful removal of surface oxide overlayer on ZnSe. C1 UNIV ILLINOIS,MAT RES LAB,URBANA,IL 61801. USN,RES LAB,WASHINGTON,DC 20375. RP KIM, YD (reprint author), UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801, USA. NR 15 TC 74 Z9 74 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 MAY 10 PY 1993 VL 62 IS 19 BP 2387 EP 2389 DI 10.1063/1.109373 PG 3 WC Physics, Applied SC Physics GA LA797 UT WOS:A1993LA79700031 ER PT J AU SCHMIDT, EG CARRUTHERS, GR AF SCHMIDT, EG CARRUTHERS, GR TI FAR-ULTRAVIOLET STELLAR PHOTOMETRY - A FIELD IN MONOCEROS SO ASTROPHYSICAL JOURNAL LA English DT Article DE OPEN CLUSTERS AND ASSOCIATIONS, GENERAL; STARS, EARLY-TYPE; SURVEYS; TECHNIQUES, PHOTOMETRIC; ULTRAVIOLET, STARS ID IMAGING SURVEY AB Far-ultraviolet photometry of stars in a field in Monoceros in the wavelength range from 1230 angstrom to 1600 angstrom has been carried out using data from an electrographic Schmidt camera carried on a sounding rocket. Ultraviolet magnitudes were extracted for 602 objects in the field. Fifty-eight percent were tentatively identified with visible stars using the SIMBAD data base while another 25% are blends of objects too close together to separate with our resolution. Eleven of the uv objects coincide with parts of the star clusters NGC 2169, NGC 2244, and NGC 2264 in which individual stars cannot be resolved. As in previous studies, the majority of the identified ultraviolet sources are identified with early-stars. However, there are a significant number for which no such identification was possible, and we suggest that many of these are nearby white dwarfs. RP SCHMIDT, EG (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4104,WASHINGTON,DC 20375, USA. NR 11 TC 5 Z9 5 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 MAY 10 PY 1993 VL 408 IS 2 BP 484 EP 495 DI 10.1086/172606 PN 1 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LA024 UT WOS:A1993LA02400011 ER PT J AU GOROCH, AK FETT, RW AF GOROCH, AK FETT, RW TI OBSERVATION OF FLOODED ICE IN ARCTIC REGIONS SO INTERNATIONAL JOURNAL OF REMOTE SENSING LA English DT Article ID MICROWAVE AB The remote detection of flooding in the Arctic ice pack has been difficult to accomplish using conventional techniques. We have examined a case of Artic flooding (8 June 1989) with NOAA and DMSP visible and infrared measurements supplemented by DMSP microwave imager (SSM/I) data. Analysis of visible and infrared data for a sunglint region was used to show the distribution of flooding at 72-degrees-N, 135-degrees-W. A simple model was developed for the radiative transfer at microwave wavelengths through a bring layer over ice. The predictions of the model were found to be consistent with the spatial behaviour of the SSM/I measurements. This case study demonstrates the usefulness of using combine visible, infrared, and microwave measurements to differentiate among flooded, broken ice, and open water regions, even in the presence of cloud cover or surface fog. RP GOROCH, AK (reprint author), USN,DIV MARINE METEOROL,RES LAB,MONTEREY,CA 93943, USA. NR 14 TC 0 Z9 0 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0143-1161 J9 INT J REMOTE SENS JI Int. J. Remote Sens. PD MAY 10 PY 1993 VL 14 IS 7 BP 1305 EP 1324 PG 20 WC Remote Sensing; Imaging Science & Photographic Technology SC Remote Sensing; Imaging Science & Photographic Technology GA LM522 UT WOS:A1993LM52200004 ER PT J AU HAWKINS, JD CLANCY, RM PRICE, JF AF HAWKINS, JD CLANCY, RM PRICE, JF TI USE OF AVHRR DATA TO VERIFY A SYSTEM FOR FORECASTING DIURNAL SEA-SURFACE TEMPERATURE VARIABILITY SO INTERNATIONAL JOURNAL OF REMOTE SENSING LA English DT Article AB Forecasts from an operational system for predicting global diurnal sea surface temperature (SST) variability are compared against multichannel sea surface temperatures calculated from advanced very high resolution radiometer data from the NOAA-9 satellite. The forecast system consists of an upper-ocean model driven by heat fluxes and wind stresses from an operational global weather prediction model. Visual pattern correlations between observed and forecast diurnal changes in SST are generally favourable, indicating that the forecast system is useful. Some systematic deficiencies are also noted: the forecasts do not reproduce the surprisingly sharp boundaries of diurnal warming regions and underpredict the amplitude of the extreme warming events. C1 USN,DIV OCEAN SENSING & PREDICT,OCEANOG & ATMOSPHER RES LAB,BAY ST LOUIS,MS 39529. FLEET NUMER OCEANOG CTR,DIV OCEAN MODELS,MONTEREY,CA 93943. WOODS HOLE OCEANOG INST,WOODS HOLE,MA 02543. NR 17 TC 7 Z9 7 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0143-1161 J9 INT J REMOTE SENS JI Int. J. Remote Sens. PD MAY 10 PY 1993 VL 14 IS 7 BP 1347 EP 1357 PG 11 WC Remote Sensing; Imaging Science & Photographic Technology SC Remote Sensing; Imaging Science & Photographic Technology GA LM522 UT WOS:A1993LM52200007 ER PT J AU ORBACH, S HENSEN, S MULLER, G PIEL, H LIPPERT, M SAEMANNISCHENKO, G WOLF, SA AF ORBACH, S HENSEN, S MULLER, G PIEL, H LIPPERT, M SAEMANNISCHENKO, G WOLF, SA TI EFFECT OF OXYGEN DEFICIENCY AND DISORDER ON MICROWAVE LOSSES OF EPITAXIALLY GROWN YBA2CU3O7-DELTA FILMS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT SYMP ON HIGH TEMPERATURE SUPERCONDUCTORS, AT THE 1992 FALL MEETING OF THE E-MRS / 3RD EUROPEAN EAST-WEST CONF AND EXHIBITION ON MATERIALS AND PROCESSES CY NOV 03-06, 1992 CL STRASBOURG, FRANCE SP EUROPEAN MAT RES SOC, COUNCIL EUROPE, COMMISS EUROPEAN COMMUNITIES, BANQUE POPULAIRE, BRASSERIE KRONENBOURG, CTR RECH NUCLEAIRES, CTR RECH NUCLEAIRES, ELSEVIER SCI PUBL, OFF TOURISME VILLE STRASBOURG, EUROPEAN PARLIAMENT ID SURFACE IMPEDANCE; THIN-FILMS AB We have investigated the influence of oxygen content and disorder on the surface impedance of epitaxial YBa2Cu3O7-delta (YBCO) films at 87 GHz. For this purpose, five films prepared by DC-sputtering on MgO substrates were annealed for 1 h at 500-degrees-C in different oxygen pressures between 80 and 1000 mbar. The degree of oxygen disorder was varied by a change of the cooling procedure or a subsequent annealing at 250-degrees-C. The absolute values as well as the slope of the resistivity in the normal conducting state and the penetration depth in the superconducting state are continuously increasing with delta. The transition temperatures change only slowly and a maximum in T(c) vs. delta occurs. As a main result, we observe a strong influence of delta on the surface resistance below 0.8T(c) which first increases at the maximum of T(c) and then decreases for higher oxygen deficiencies. Oxygen disorder leads to a degradation of all measured quantities, but R(s) was found to be most affected. These observations can be explained in the context of a recent model by Kresin and Wolf which proposes two conductive subsystems and, as a result, a two-gap structure of YBCO. Charge transfer between the Cu-O planes and chains leads to an induced superconducting state in the chains. Oxygen content and order affect the value of the smaller energy gap of the chains, which in turn has a large impact on R(s). However, T(c) changes only slowly, reflecting its main correlation to the large energy gap given by the planes. C1 UNIV ERLANGEN NURNBERG,INST PHYS,W-8520 ERLANGEN,GERMANY. USN,RES LAB,WASHINGTON,DC 20375. RP ORBACH, S (reprint author), BERG UNIV WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL,GERMANY. RI Wolf, Stuart/A-7513-2009 NR 16 TC 12 Z9 12 U1 0 U2 2 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 MAY 10 PY 1993 VL 195 IS 1-2 BP 555 EP 558 DI 10.1016/0925-8388(93)90798-R PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA LC492 UT WOS:A1993LC49200127 ER PT J AU SPRANGLE, P HAFIZI, B JOYCE, G SERAFIM, P AF SPRANGLE, P HAFIZI, B JOYCE, G SERAFIM, P TI METHODS FOR CONDITIONING ELECTRON-BEAMS IN FREE-ELECTRON LASERS SO PHYSICAL REVIEW LETTERS LA English DT Article ID NON-LINEAR THEORY; EFFICIENCY ENHANCEMENT; HIGH-GAIN; WAVELENGTH; WIGGLERS AB The operation of free-electron lasers can be severely limited by the axial velocity spread of the beam electrons. In this Letter we propose methods for reducing the axial velocity spread in electron beams by redistributing the electron energy via interaction with an axially symmetric, slow, TM waveguide mode. In the first method, the energy redistribution is correlated with the electrons' betatron amplitude, while in the second method it is correlated with the electrons' synchrotron amplitude. Reductions by more than a factor of 40 in the rms axial velocity spread have been obtained in simulations. C1 ICARUS RES,BETHESDA,MD 20814. NORTHEASTERN UNIV,BOSTON,MA 02115. RP SPRANGLE, P (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 21 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 10 PY 1993 VL 70 IS 19 BP 2896 EP 2899 DI 10.1103/PhysRevLett.70.2896 PG 4 WC Physics, Multidisciplinary SC Physics GA LB099 UT WOS:A1993LB09900019 ER PT J AU IDZERDA, YU TJENG, LH LIN, HJ GUTIERREZ, CJ MEIGS, G CHEN, CT AF IDZERDA, YU TJENG, LH LIN, HJ GUTIERREZ, CJ MEIGS, G CHEN, CT TI MAGNETIC-STRUCTURE OF FE/CR/FE TRILAYERS SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL CONF ON SOLID SURFACES ( ICSS-8 ) / 12TH INTERNATIONAL VACUUM CONGRESS ( IVC-12 ) CY OCT 12-16, 1992 CL THE HAGUE, NETHERLANDS SP INT UNION VACUUM SCI TECH & APPLICAT, NETHERLANDS VACUUM SOC ID X-RAY DICHROISM; FE LAYERS; ELECTRONIC-STRUCTURE; CIRCULAR-DICHROISM; CR; EXCHANGE; MAGNETORESISTANCE; SUPERLATTICES; INTERLAYER; NICKEL AB The magnetic structure of each layer of Fe/Cr/Fe trilayers deposited on GaAs(001) is determined by soft X-ray magnetic circular dichroism (SXMCD) which is derived from X-ray absorption spectroscopy using circularly polarized light. Submonolayer coverages (0.25 ML) of Cr on Fe(001) films are found to be ferromagnetic and anti-aligned to the Fe moment. Additional Cr deposition shows a monotonically decreasing total moment, consistent with island growth of ferromagnetic Cr sheets anti-aligned with adjoining Cr layers. A second Fe film deposited on thin Cr interlayers is anti-aligned with the first Fe film. A second Fe film of less than 2 ML thickness shows no SXMCD signal. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. SW TEXAS STATE UNIV,DEPT PHYS,SAN MARCOS,TX 78666. RP IDZERDA, YU (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 30 TC 13 Z9 13 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAY 10 PY 1993 VL 287 BP 741 EP 746 DI 10.1016/0039-6028(93)91064-V PN B PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LF071 UT WOS:A1993LF07100039 ER PT J AU BROZENA, JM PETERS, MF FORSBERG, R AF BROZENA, JM PETERS, MF FORSBERG, R TI AIRBORNE MEASUREMENT OF ABSOLUTE SEA-SURFACE HEIGHTS SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article AB Topographic profiles may be measured from an aircraft by differencing precise radar or laser altitudes with ellipsoidal heights obtained by means of kinematic interferometric-mode GPS. Over the ocean, the difference between the two altitudes is the geoid height plus dynamic oceanographic effects such as tides, currents, eddies, etc. Aircraft might provide, on a local scale, altimetry measurements similar to those from GEOSAT and ERS-1. Such airborne measurements could be applied to the determination of a local high-resolution geoid or for oceanographic studies. Several long over-water altimetry profiles were obtained during the 1991 field campaign of the Greenland Aerogeophysics Project (GAP91). Kinematic interferometric GPS between multiple short or zero-baseline airborne receivers and several sets of stationary GPS receivers on the ground provided precise three-dimensional positioning for airborne gravity, magnetic and topographic profiling sensor systems mounted aboard a P-3 Orion aircraft. The logistics of surveying a large region (long GPS baselines and poor satellite coverage) limit the accuracy of the GPS positioning, but the geoid signal is clearly visible in the over-water profiles, In spite of GPS baseline lengths of up to 1000 km, differences between modeled geoid heights and measured sea-surface heights ranged from about 1-2 meters r.m.s. . Although the differences are primarily due to errors in the GPS positions, some portion is due to errors in the model geoid, uncompensated tides, sea-ice contamination of the radar data and other errors in the radar. We believe that this represents the first airborne measurement of absolute sea-surface heights. C1 NATL SURVEY & CADASTRE DENMARK,DIV GEODET,DK-2400 COPENHAGEN NV,DENMARK. UNIV CAMBRIDGE,CAMBRIDGE,ENGLAND. RP BROZENA, JM (reprint author), USN,RES LAB,CODE 7420,WASHINGTON,DC 20375, USA. NR 11 TC 4 Z9 4 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD MAY 7 PY 1993 VL 20 IS 9 BP 875 EP 878 DI 10.1029/93GL00864 PG 4 WC Geosciences, Multidisciplinary SC Geology GA LC958 UT WOS:A1993LC95800028 ER PT J AU FRENZEN, CL AF FRENZEN, CL TI EXPLICIT MEAN ENERGIES FOR THE THERMODYNAMICS OF SYSTEMS OF FINITE SEQUENCES SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Note AB Wislicki has suggested that the Hamming distance between binary sequences (or strings, or bit-strings) might serve as an interaction energy. The partition function and related thermodynamic quantities could then be calculated and used to investigate ensembles of binary string systems evolving, for example, according to cellular automata rules. In this note we construct the explicit mean energies for ensembles whose elements consist of N bit-strings, each of length M. The N bit-strings have n1, n2,...,n(N) 1s and M - n1, M - n2,...,M - n(N) 0s, respectively, where 0 less-than-or-equal-to n(i) less-than-or-equal-to M, i = 1, 2,...,N. The energy of N interacting bit-strings is taken to be the pairwise sum of the Hamming distances between individual pairs of bit-strings. RP FRENZEN, CL (reprint author), USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93943, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0305-4470 J9 J PHYS A-MATH GEN JI J. Phys. A-Math. Gen. PD MAY 7 PY 1993 VL 26 IS 9 BP 2269 EP 2273 DI 10.1088/0305-4470/26/9/022 PG 5 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA LJ584 UT WOS:A1993LJ58400022 ER PT J AU SHLESINGER, MF ZASLAVSKY, GM KLAFTER, J AF SHLESINGER, MF ZASLAVSKY, GM KLAFTER, J TI STRANGE KINETICS SO NATURE LA English DT Review ID ANOMALOUS TRANSPORT; JOSEPHSON-JUNCTIONS; ENHANCED DIFFUSION; DISORDERED MEDIA; LEVY DYNAMICS; TURBULENCE; MODEL; STREAMLINES; TIME AB The once abstract notions of fractal space and time now appear naturally and inevitably in chaotic dynamical systems and lead to 'strange kinetics' and anomalous transport properties. An understanding of this kind of dynamical behaviour should provide insights into, for example, turbulent fluid dynamics and particle random-walk processes. C1 NYU,DEPT PHYS,NEW YORK,NY 10012. NYU,COURANT INST MATH SCI,NEW YORK,NY 10012. MIT,DEPT CHEM,CAMBRIDGE,MA 02139. TEL AVIV UNIV,SCH CHEM,IL-69978 TEL AVIV,ISRAEL. RP SHLESINGER, MF (reprint author), OFF NAVAL RES,DIV PHYS,800 N QUINCY ST,ARLINGTON,VA 22217, USA. NR 43 TC 786 Z9 794 U1 2 U2 50 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD MAY 6 PY 1993 VL 363 IS 6424 BP 31 EP 37 DI 10.1038/363031a0 PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LA682 UT WOS:A1993LA68200049 ER PT J AU LAROCCO, A SANDERS, JW MYERS, JW AF LAROCCO, A SANDERS, JW MYERS, JW TI CENTRAL-NERVOUS-SYSTEM TOXOPLASMOSIS IN AIDS SO NEW ENGLAND JOURNAL OF MEDICINE LA English DT Letter ID IMMUNE-DEFICIENCY SYNDROME RP LAROCCO, A (reprint author), USN HOSP,PORTSMOUTH,VA 23708, USA. NR 2 TC 3 Z9 3 U1 0 U2 0 PU MASS MEDICAL SOC PI BOSTON PA 10 SHATTUCK, BOSTON, MA 02115 SN 0028-4793 J9 NEW ENGL J MED JI N. Engl. J. Med. PD MAY 6 PY 1993 VL 328 IS 18 BP 1353 EP 1353 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA KZ640 UT WOS:A1993KZ64000023 PM 8469261 ER PT J AU LEE, KE HIGA, KT AF LEE, KE HIGA, KT TI SYNTHESIS, CHARACTERIZATION, AND REACTIVITY OF NEW ALKYLGALLIUM ACETYLIDES SO JOURNAL OF ORGANOMETALLIC CHEMISTRY LA English DT Article ID GALLIUM; PHOSPHORUS; COMPLEXES; ALKYNES; INDIUM AB Reaction of Me2GaCl and LiC=CSiMe3 or R2GaCl (R = Me, (t)Bu) and LiC=CPh (benzene, 70-degrees-C) gives [Me2GaC=CSiMe3]2 and [R2GaC=CPh]2 in 62%, 58%, and 71% yields, respectively. The gallium acetylides were characterized by IR, Raman, and NMR (H-1, C-13, C-13{H-1}) spectroscopy. Reactions of the dimethylgallium acetylides and phosphines (R2PH; R=Et, (i)Pr) (toluene, 110-20-degrees-C) give HC=CSiMe3 or HC=CPh and the corresponding dimethylgallium dialkylphosphides [Me2GaPR2]n (R=Et, n=3, (i)Pr, n=2). RP LEE, KE (reprint author), USN,CTR AIR WARFARE,RES DEPT,DIV CHEM,DIV WEAP,CHINA LAKE,CA 93555, USA. NR 30 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-328X J9 J ORGANOMET CHEM JI J. Organomet. Chem. PD MAY 4 PY 1993 VL 449 IS 1-2 BP 53 EP 59 DI 10.1016/0022-328X(93)80106-L PG 7 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA LD055 UT WOS:A1993LD05500007 ER PT J AU HENDERSHOT, DG BERRY, AD AF HENDERSHOT, DG BERRY, AD TI PRIMARY AND SECONDARY TRIMETHYLSILYLMETHYLSTIBINES - SYNTHESIS, CHARACTERIZATION AND CHEMICAL-VAPOR DEPOSITION PROPERTIES SO JOURNAL OF ORGANOMETALLIC CHEMISTRY LA English DT Article ID PHASE EPITAXY; GROWTH; INSB; GAAS; TERTIARYBUTYLARSINE; BUTYLPHOSPHINE; INP AB The primary and secondary trimethylsilylmethylstibines (trimethylsilylmethyl = Me3SiCH2-) (Me3SiCH2)SbH2 and (Me3SiCH2)2SbH have been synthesized by the reduction of a corresponding dihalo- and monohaloantimony compound, respectively. Trimethylsilylmethylstibine was prepared by the reduction of (Me3SiCH2)SbBr2 With lithium aluminum hydride (LAH) in tetraglyme. The primary stibine is highly air-sensitive and exhibits a vapor pressure of 2.0 Torr at 0-degrees-C. Bis-(trimethytsilylmethyl)stibine was synthesized by the LAH reduction of either (Me3SiCH2)2SbBr or (Me3SiCH2)2SbI in diethyl ether, The secondary stibine is less sensitive to air than (Me3SiCH2)SbH2 but nonetheless decomposes quickly when exposed to air. The detailed synthesis, spectroscopic characterizations and physical properties of both stibines, as well as the preliminary chemical vapor deposition experiments of (Me3SiCH2)SbH2, are discussed. RP HENDERSHOT, DG (reprint author), USN,RES LAB,MAT CHEM BRANCH,CODE 6120,WASHINGTON,DC 20375, USA. NR 21 TC 14 Z9 14 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-328X J9 J ORGANOMET CHEM JI J. Organomet. Chem. PD MAY 4 PY 1993 VL 449 IS 1-2 BP 119 EP 123 DI 10.1016/0022-328X(93)80114-Q PG 5 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA LD055 UT WOS:A1993LD05500015 ER PT J AU HENRY, MR JENSEN, KLD SKOGLUND, CD ARMSTRONG, DW AF HENRY, MR JENSEN, KLD SKOGLUND, CD ARMSTRONG, DW TI CHLAMYDIA-TRACHOMATIS IN ROUTINE CERVICAL SMEARS - A MICROSCOPIC AND ULTRASTRUCTURAL ANALYSIS SO ACTA CYTOLOGICA LA English DT Article AB This study examined cervical smears for cytologic evidence of Chlamydia trachomatis in 380 women seen for routine gynecologic examination or follow-up for an abnormal cervical smear. Cervical smears and Chlamydiazyme samples were obtained. Fifteen patients tested Chlamydiazyme positive and were considered to be Chlamydia positive. Cellular samples meeting the screening criteria were examined carefully for evidence of Chlamydia, including type II (central target inclusions) and type III (granular inclusions or nebular inclusions). Electron microscopy was performed on representative inclusions from both Chlamydia-positive and -negative patients. Inclusions were identified in 6 of the Chlamydia-positive and 31 of the -negative patients. Electron microscopy of type II and III inclusions, from both positive and negative patients, revealed chlamydial organisms to be present only in nebular inclusions. Intracytoplasmic inclusions, other than nebular inclusions, result from inflammatory changes and, as such, may be induced by a chlamydial infection but are not specific to Chlamydia. C1 UNIV ROCHESTER, STRONG MEM HOSP, ROCHESTER, NY 14642 USA. USN HOSP, GROTON, CT USA. RP HENRY, MR (reprint author), NATL NAVAL MED CTR, BETHESDA, MD 20814 USA. NR 35 TC 3 Z9 5 U1 0 U2 0 PU SCI PRINTERS & PUBL INC PI ST LOUIS PA P.O. DRAWER 12425 8342 OLIVE BLVD, ST LOUIS, MO 63132 SN 0001-5547 J9 ACTA CYTOL JI Acta Cytol. PD MAY-JUN PY 1993 VL 37 IS 3 BP 343 EP 352 PG 10 WC Pathology SC Pathology GA LD471 UT WOS:A1993LD47100012 PM 8388608 ER PT J AU NASHED, NW OLSON, JG ELTIGANI, A AF NASHED, NW OLSON, JG ELTIGANI, A TI ISOLATION OF BATAI VIRUS (BUNYAVIRIDAE, BUNYAVIRUS) FROM THE BLOOD OF SUSPECTED MALARIA PATIENTS IN SUDAN SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID FEVER AB From August through November 1988, 77,500 patients with fever presented to the municipal hospital and to eight government health centers in Kassala, a town of approximately 400,000 individuals in eastern Sudan. A diagnosis of malaria, based primarily on clinical presentation, was made in 14,395 individuals during this four-month period; fevers of unknown origin were diagnosed in 29 patients. A Bunyavirus that was antigenically similar or identical to Batai virus by complement fixation and plaque-reduction neutralization tests was recovered from two of 196 sera collected from patients with acute fever admitted to the municipal hospital in Kassala in October 1988. IgM antibody against this virus was detected by enzyme-linked immunosorbent assay in 7% of the sera from patients with acute fever tested and IgG antibody was detected in 61%. C1 CENT PUBL HLTH LABS,KHARTOUM,SUDAN. USN,DIV MED ZOOL,CAIRO,EGYPT. USN,DIV EPIDEMIOL,CAIRO,EGYPT. RP NASHED, NW (reprint author), USN,MED RES UNIT 3,RES PUBLICAT BRANCH,PSC 452,BOX 5000,CAIRO,EGYPT. FU NIAID NIH HHS [AI-10984] NR 38 TC 17 Z9 23 U1 0 U2 2 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DRIVE SUITE 130, MCLEAN, VA 22101 SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD MAY PY 1993 VL 48 IS 5 BP 676 EP 681 PG 6 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA LJ653 UT WOS:A1993LJ65300012 PM 8517485 ER PT J AU RODIER, GR COUZINEAU, B GRAY, GC OMAR, CS FOX, E BOULOUMIE, J WATTS, D AF RODIER, GR COUZINEAU, B GRAY, GC OMAR, CS FOX, E BOULOUMIE, J WATTS, D TI TRENDS OF HUMAN-IMMUNODEFICIENCY-VIRUS TYPE-1 INFECTION IN FEMALE PROSTITUTES AND MALES DIAGNOSED WITH A SEXUALLY-TRANSMITTED DISEASE IN DJIBOUTI, EAST-AFRICA SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID HIV INFECTION AB A cross-sectional serosurvey for human immunodeficiency virus type 1 (HIV-1) was conducted during the first quarter of 1991 among high risk groups in Djibouti, East Africa, and compared with previous surveys in 1987, 1988, and 1990. The survey demonstrated evidence of HIV-1 infection in 36.0% (n = 292) of street prostitutes, 15.3% (n = 360) of prostitutes working as bar hostesses, and 10.4% (n = 193) of males diagnosed with a sexually transmitted disease. By multivariate modeling, HIV-1 seropositivity in prostitutes was associated with Ethiopian nationality, working as a street prostitute, and residing in Djibouti for two years or less. We suggest that prostitution, particularly street prostitution, is a major route of HIV-1 transmission in Djibouti. C1 UNIV MARYLAND,SCH MED,INT HLTH PROGRAM,BALTIMORE,MD 21201. RP RODIER, GR (reprint author), USN,MED RES UNIT 3,RES PUBL BRANCH,PSC 452,BOX 5000,CAIRO,EGYPT. NR 5 TC 13 Z9 14 U1 0 U2 0 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DRIVE SUITE 130, MCLEAN, VA 22101 SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD MAY PY 1993 VL 48 IS 5 BP 682 EP 686 PG 5 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA LJ653 UT WOS:A1993LJ65300013 PM 8517486 ER PT J AU ABBASSY, MM OSMAN, M MARZOUK, AS AF ABBASSY, MM OSMAN, M MARZOUK, AS TI WEST NILE VIRUS (FLAVIVIRIDAE, FLAVIVIRUS) IN EXPERIMENTALLY INFECTED ARGAS TICKS (ACARI, ARGASIDAE) SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID ORNITHODOROS-MOUBATA-PORCINUS; SWINE FEVER VIRUS; LOCALIZATION AB To better define the possible role of argasid ticks in the epidemiology of West Nile virus, adult Argas arboreus, A. persicus, and A. hermanni were fed through a membrane on fetal bovine serum containing 10(5.5) 50% tissue culture infective doses (TCID50)/ml of West Nile virus. The virus was detected for three and four days after feeding in A. persicus and A. hermanni, respectively. The virus titers then decreased to undetectable levels in both species. When the infective dose was increased to 10(6.2), virus was detected until days 6 and 8, respectively. In A. arboreus, virus titers in whole tick homogenates reached a peak of 10(4.0) on day 4 postfeeding and remained constant at 10(3.0) after day 6 throughout the 20- or 50-day observation periods. Virus was detected by isolation, indirect fluorescent antibody, and histochemical techniques in the salivary glands, ovaries, synganglia, and coxal fluids. Infected ticks successfully transmitted virus to clean chickens on day 20 postfeeding. No evidence of transstadial transmission from nymph to adult was detected. Larvae from experimentally infected females successfully transmitted virus to clean chicks and virus was recovered from F1 larvae. Venereal transmission was not detected. Virus was present in coxal fluids secreted by infected females after infective meals. This study demonstrates West Nile virus infection in experimentally infected A. arboreus ticks and documents horizontal and vertical transmission in this species. C1 AIN SHAMS UNIV,FAC SCI,DEPT ZOOL,CAIRO,EGYPT. RP ABBASSY, MM (reprint author), USN,MED RES UNIT 3,RES PUBL BRANCH,PSC 452,BOX 5000,FPO,AE 09835-0007,CAIRO,EGYPT. NR 40 TC 37 Z9 40 U1 1 U2 4 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DRIVE SUITE 130, MCLEAN, VA 22101 SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD MAY PY 1993 VL 48 IS 5 BP 726 EP 738 PG 13 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA LJ653 UT WOS:A1993LJ65300019 PM 8517492 ER PT J AU NYLEN, ES BECKER, KL SNIDER, RH TABASSIAN, AR CASSIDY, MM LINNOILA, RI AF NYLEN, ES BECKER, KL SNIDER, RH TABASSIAN, AR CASSIDY, MM LINNOILA, RI TI CHOLINERGIC-NICOTINIC CONTROL OF GROWTH AND SECRETION OF CULTURED PULMONARY NEUROENDOCRINE CELLS SO ANATOMICAL RECORD LA English DT Article; Proceedings Paper CT WORKSHOP ON PULMONARY NEUROENDOCRINE CELLS IN HEALTH AND DISEASE CY SEP 05-06, 1991 CL BETHESDA, MD SP NHLBI DE PNE CELL CULTURE; NICOTINE; CALCITONIN ID INTRAPULMONARY NEUROEPITHELIAL BODIES; BABY MOUSE LUNGS; ENDOCRINE-CELLS; CIGARETTE-SMOKE; CALCITONIN SECRETION; CAROTID-BODY; L-DOPA; RECEPTORS; CANCER; BOMBESIN AB Dispersed newborn hamster lung cells were established in vitro in a defined, low-serum growth medium. Neuroendocrine markers (immunohistochemistry for bombesin/gastrin-releasing peptide and calcitonin) revealed a cellular predominance of pulmonary neuroendocrine (PNE) cells. While the supernatant concentration remained stable, the concentration of PNE cell immunoreactive calcitonin (iCT) gradually declined over 4 weeks. Supplementation of the medium with nicotine for 3 weeks prevented this decline in cellular iCT. Concurrently, the number of cells and [H-3]thymidine incorporation were significantly increased. The stimulatory effect of chronic nicotine was reversed by the coadministration of the nicotinic antagonist hexamethonium. In another set of experiments, prior multiple transplacental nicotine pretreatments resulted in a significant increase in iCT in the lungs of newborns; when these lungs were subsequently placed in cell culture without nicotine, despite the higher concentration of iCT, there was a drop in iCT similar to that observed in the control culture. In contrast, in vivo, the lung iCT remained significantly elevated at 1 week postparturition. Cell culture supernatants were analyzed at week 4 for the evoked release of iCT; cholinergic-nicotinic agonists promptly increased the supernatant iCT, which was blocked by nicotinic but not by muscarinic antagonists. We suggest that this in vitro system provides a useful tool to study directly the PNE cell. The acute and chronic effects of nicotine are most likely related to stimulation of cholinergic-nicotinic receptors on iCT-containing PNE cells. C1 GEORGE WASHINGTON UNIV,SCH MED,VET AFFAIRS MED CTR,DEPT ENDOCRINOL,WASHINGTON,DC 20422. NCI,USN,ONCOL BRANCH,BETHESDA,MD 20892. RP NYLEN, ES (reprint author), GEORGE WASHINGTON UNIV,SCH MED,VET AFFAIRS MED CTR,DEPT PHYSIOL,50 IRVING ST NW,WASHINGTON,DC 20422, USA. NR 48 TC 22 Z9 22 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 0003-276X J9 ANAT REC JI Anat. Rec. PD MAY PY 1993 VL 236 IS 1 BP 129 EP 135 DI 10.1002/ar.1092360117 PG 7 WC Anatomy & Morphology SC Anatomy & Morphology GA KZ646 UT WOS:A1993KZ64600020 PM 8506998 ER PT J AU LINNOILA, RI GAZDAR, AF FUNA, K BECKER, KL AF LINNOILA, RI GAZDAR, AF FUNA, K BECKER, KL TI LONG-TERM SELECTIVE CULTURE OF HAMSTER PULMONARY ENDOCRINE-CELLS SO ANATOMICAL RECORD LA English DT Article; Proceedings Paper CT WORKSHOP ON PULMONARY NEUROENDOCRINE CELLS IN HEALTH AND DISEASE CY SEP 05-06, 1991 CL BETHESDA, MD SP NHLBI DE DIFFUSE NEUROENDOCRINE SYSTEM; IMMUNOREACTIVE CALCITONIN; SMALL CELL LUNG CANCER; SPECIFIC PRODUCTS; GENERAL NE MARKERS ID L-DOPA DECARBOXYLASE; LUNG-CANCER; SUPPLEMENTED MEDIUM; GROWTH-FACTOR; CALCITONIN; INVITRO; LINES; DIETHYLNITROSAMINE; DIFFERENTIATION; EXPRESSION AB We describe, for the first time, the development of a technique for a long-term selective culture of endocrine (PE) cells from the lungs of normal animals. Epithelial cells were isolated from 1-day-old hamster lungs through mechanical and enzymatic dissociation with collagenase type II. Cells were then cultured in HITES medium which contained RPMI 1640, hydrocortisone, insulin, transferrin, estradiol, sodium selenite, and supplemented with 5% fetal bovine serum (FBS), or medium which contained HITES medium supplemented with bovine serum albumin, phosphoethanolamine, arginine vasopressin, bombesin, and 2% FBS (9N). HITES medium, originally developed for establishment and long-term culture of human small cell lung cancer (SCLC) cell lines, allowed propagation of normal hamster PE cells up to 12 months as a mixed floating-attached cell culture. No difference was noted in the results using HITES or 9N. By 3 months, 80% of the cultured cells contained characteristic dense-core (endocrine type) granules. The cultured PE cells also expressed creatine kinase brain isoenzyme, and general NE markers including neuron specific enolase, and amine handling enzyme activity within the range of SCLC cell lines. Moreover, cultured PE cells contained and secreted immunoreactive calcitonin (iCT) which had a molecular profile similar to that of intact hamster lung. This long-term culture technique should markedly assist in elucidating the role of PE cells in health and disease. C1 NCI,USN,MED ONCOL BRANCH,BETHESDA,MD 20892. UNIV TEXAS,SW MED CTR,SIMMONS MED CTR,DALLAS,TX 75230. UNIV TEXAS,SW MED CTR,DEPT PATHOL,DALLAS,TX 75230. GEORGE WASHINGTON UNIV,WASHINGTON,DC 20052. VET AFFAIRS MED CTR,WASHINGTON,DC. NR 31 TC 10 Z9 10 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 0003-276X J9 ANAT REC JI Anat. Rec. PD MAY PY 1993 VL 236 IS 1 BP 231 EP 240 DI 10.1002/ar.1092360128 PG 10 WC Anatomy & Morphology SC Anatomy & Morphology GA KZ646 UT WOS:A1993KZ64600033 PM 8389531 ER PT J AU JAPOUR, AJ MAYERS, DL JOHNSON, VA KURITZKES, DR BECKETT, LA ARDUINO, JM LANE, J BLACK, RJ REICHELDERFER, PS DAQUILA, RT CRUMPACKER, CS BALFOUR, H ERICE, A COOMBS, R KATZENSTEIN, D LATHEY, J RICHMAN, D MCINTOSH, K RANGAN, S REICHMAN, R SCOTT, W USSERY, M ABRAMS, L MCCUTCHAN, F BURKE, D GARDNER, L ROBERTS, C CHUNG, R HICKS, C SHELLIE, E FOWLER, A MERRITT, L FUJIMURAJUSTICE, M RUIZ, N WAGNER, K GAIL, M AF JAPOUR, AJ MAYERS, DL JOHNSON, VA KURITZKES, DR BECKETT, LA ARDUINO, JM LANE, J BLACK, RJ REICHELDERFER, PS DAQUILA, RT CRUMPACKER, CS BALFOUR, H ERICE, A COOMBS, R KATZENSTEIN, D LATHEY, J RICHMAN, D MCINTOSH, K RANGAN, S REICHMAN, R SCOTT, W USSERY, M ABRAMS, L MCCUTCHAN, F BURKE, D GARDNER, L ROBERTS, C CHUNG, R HICKS, C SHELLIE, E FOWLER, A MERRITT, L FUJIMURAJUSTICE, M RUIZ, N WAGNER, K GAIL, M TI STANDARDIZED PERIPHERAL-BLOOD MONONUCLEAR CELL-CULTURE ASSAY FOR DETERMINATION OF DRUG SUSCEPTIBILITIES OF CLINICAL HUMAN-IMMUNODEFICIENCY-VIRUS TYPE-1 ISOLATES SO ANTIMICROBIAL AGENTS AND CHEMOTHERAPY LA English DT Article ID HIV-1 REVERSE-TRANSCRIPTASE; ZIDOVUDINE AZT; REDUCED SENSITIVITY; RESISTANT; INHIBITORS; THERAPY; INVITRO AB A standardized antiviral drug susceptibility assay for clinical human immunodeficiency virus type 1 (HIV-1) isolates has been developed for use in clinical trials. The protocol is a two-step procedure that first involves cocultivation of patient infected peripheral blood mononuclear cells (PBMC) with seronegative phytohemag-glutinin-stimulated donor PBMC to obtain an HIV-1 stock. The virus stock is titrated for viral infectivity (50% tissue culture infective dose) by use of serial fourfold virus dilutions in donor PBMC. A standardized inoculum of 1,000 50% tissue culture infective doses per 10(6) cells is used in the second step of the procedure to acutely infect seronegative donor PBMC in a 7-day microtiter plate assay with triplicate wells containing zidovudine (ZDV) concentrations ranging from 0 to 5.0 muM. The ZDV 50% inhibitory concentrations (IC50) for reference ZDV-susceptible and ZDV-resistant HIV-1 isolates ranged from 0.002 to 0.113 muM and from 0.15 to >5.0 muM, respectively. Use of this consensus protocol reduced interlaboratory variability for ZDV IC50 determinations with reference HIV-1 isolates. Among eight laboratories, the coefficient of variation ranged from 0.85 to 1.25 with different PBMC protocols and was reduced to 0.39 to 0.98 with the standardized assay. Among the clinical HIV-1 isolates assayed by the standardized drug susceptibility assay, the median ZDV IC50 increased gradually with more ZDV therapy. This protocol provides an efficient and reproducible means to assess the in vitro susceptibility to antiretroviral agents of virtually all clinical HIV-1 isolates. C1 WALTER REED ARMY INST RES, DEPT DIAGNOST RETROVIROL, ROCKVILLE, MD 20850 USA. USN, MED RES INST, ROCKVILLE, MD 20850 USA. SRA TECHNOL, ROCKVILLE, MD 20850 USA. UNIV ALABAMA, SCH MED, DIV INFECT DIS, BIRMINGHAM, AL 35294 USA. UNIV COLORADO, HLTH SCI CTR, DIV INFECT DIS, DENVER, CO 80262 USA. HARVARD UNIV, SCH PUBL HLTH, CTR STAT DATA ANAL, BOSTON, MA 02115 USA. NIAID, DIV AIDS, BETHESDA, MD 20892 USA. NATL NAVAL MED CTR, BETHESDA, MD 20814 USA. HARVARD UNIV, MASSACHUSETTS GEN HOSP E, SCH MED, INFECT DIS UNIT, BOSTON, MA 02129 USA. UNIV MINNESOTA, MINNEAPOLIS, MN 55455 USA. STANFORD UNIV, MED CTR, SCH MED, STANFORD, CA 94305 USA. UNIV WASHINGTON, SEATTLE, WA 98195 USA. UNIV CALIF SAN DIEGO, LA JOLLA, CA 92093 USA. HARVARD UNIV, CHILDRENS HOSP, SCH MED, BOSTON, MA 02115 USA. TULANE UNIV, MED CTR, NEW ORLEANS, LA 70118 USA. UNIV ROCHESTER, ROCHESTER, NY 14627 USA. UNIV MIAMI, SCH MED, MIAMI, FL 33152 USA. HENRY M JACKSON FDN, BETHESDA, MD USA. WALTER REED ARMY INST RES, WASHINGTON, DC 20307 USA. WALTER REED ARMY MED CTR, WASHINGTON, DC 20307 USA. RP JAPOUR, AJ (reprint author), HARVARD UNIV, BETH ISRAEL HOSP, SCH MED, DIV INFECT DIS, BOSTON, MA 02215 USA. OI /0000-0002-5704-8094 FU NIAID NIH HHS [AI 62534, AI 27659, AI 29173] NR 31 TC 250 Z9 260 U1 1 U2 3 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0066-4804 J9 ANTIMICROB AGENTS CH JI Antimicrob. Agents Chemother. PD MAY PY 1993 VL 37 IS 5 BP 1095 EP 1101 PG 7 WC Microbiology; Pharmacology & Pharmacy SC Microbiology; Pharmacology & Pharmacy GA LA017 UT WOS:A1993LA01700028 PM 8517697 ER PT J AU DUEWEKE, TJ POPPE, SM ROMERO, DL SWANEY, SM SO, AG DOWNEY, KM ALTHAUS, IW REUSSER, F BUSSO, M RESNICK, L MAYERS, DI LANE, J ARISTOFF, PA THOMAS, RC TARPLEY, WG AF DUEWEKE, TJ POPPE, SM ROMERO, DL SWANEY, SM SO, AG DOWNEY, KM ALTHAUS, IW REUSSER, F BUSSO, M RESNICK, L MAYERS, DI LANE, J ARISTOFF, PA THOMAS, RC TARPLEY, WG TI U-90152, A POTENT INHIBITOR OF HUMAN-IMMUNODEFICIENCY-VIRUS TYPE-1 REPLICATION SO ANTIMICROBIAL AGENTS AND CHEMOTHERAPY LA English DT Article ID REVERSE-TRANSCRIPTASE INHIBITORS; NONNUCLEOSIDE INHIBITORS; HIV-1; DERIVATIVES; INFECTION; CELLS; AIDS; DNA AB Bisheteroarylpiperazines are potent inhibitors of human immunodeficiency virus type 1 (HIV-1) reverse transcriptase (RT). We describe a novel bisheteroarylpiperazine, U-90152 {1-(5-methanesulfonamido-1H-indol-2-yl-carbonyl)-4-[3-(1-methylethyl-amino)pyridinyl]piperazine}, which inhibited recombinant HIV-1 RT at a 50% inhibitory concentration (IC50) of 0.26 muM (compared with IC50s of >440 muM for DNA polymerases alpha and delta). U-90152 blocked the replication in peripheral blood lymphocyles of 25 primary HIV-1 isolates, including variants that were highly resistant to 3'-azido-2',3'-dideoxythymidine (AZT) or 2',3'-dideoxyinosine, with a mean 50% effective dose of 0.066 +/- 0.137 muM. U-90152 had low cellular cytotoxicity, causing less than 8% reduction in peripheral blood lymphocyte viability at 100 muM. In experiments assessing inhibition of the spread of HIV-1IIIB in cell cultures, U-90152 was much more effective than AZT. When approximately 500 HIV-1IIIB-infected MT-4 cells were mixed 1:1,000 with uninfected cells, 3 muM AZT delayed the evidence of rapid viral growth for 7 days. In contrast, 3 muM U-90152 totally prevented the spread of HIV-1, and death and/or dilution of the original inoculum of infected cells prevented renewed viral growth after U-90152 was removed at day 24. The combination of U-90152 and AZT, each at 0.5 muM, also totally prevented viral spread. Finally, although the RT amino acid substitutions K103N (lysine 103 to asparagine) and Y181C (tyrosine 181 to cysteine), which confer cross-resistance to several nonnucleoside inhibilors, also decrease the potency of U-90152, this drug retains significant activity against these mutant RTs in vitro (IC50s, approximately 8 muM). C1 UPJOHN CO LABS,KALAMAZOO,MI 49001. UNIV MIAMI,MIAMI,FL 33101. MT SINAI MED CTR,MILWAUKEE,WI 53233. WALTER REED ARMY INST RES,ROCKVILLE,MD 20850. USN,MED RES INST,ROCKVILLE,MD 20850. SRA TECHNOL,ROCKVILLE,MD 20850. NR 28 TC 132 Z9 135 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0066-4804 J9 ANTIMICROB AGENTS CH JI Antimicrob. Agents Chemother. PD MAY PY 1993 VL 37 IS 5 BP 1127 EP 1131 PG 5 WC Microbiology; Pharmacology & Pharmacy SC Microbiology; Pharmacology & Pharmacy GA LA017 UT WOS:A1993LA01700033 PM 7685995 ER PT J AU KOWALSKI, MP SEELY, JF HUNTER, WR RIFE, JC BARBEE, TW HOLLAND, GE BOYER, CN BROWN, CM CRUDDACE, RG AF KOWALSKI, MP SEELY, JF HUNTER, WR RIFE, JC BARBEE, TW HOLLAND, GE BOYER, CN BROWN, CM CRUDDACE, RG TI DUAL-WAVEBAND OPERATION OF A MULTILAYER-COATED DIFFRACTION GRATING IN THE SOFT-X-RAY RANGE AT NEAR-NORMAL INCIDENCE SO APPLIED OPTICS LA English DT Article DE DIFFRACTION GRATING; MULTILAYER COATING; EXTREME ULTRAVIOLET ID EXTREME ULTRAVIOLET; PERFORMANCE AB A concave diffraction grating (2400 grooves/mm) coated with a Si/Mo multilayer has an efficiency of 2.5% at 290 angstrom and a resolving power of 14,000 in third order of 156 angstrom. C1 SFA INC, LANDOVER, MD 20785 USA. USRA, WASHINGTON, DC 20024 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP KOWALSKI, MP (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 11 TC 26 Z9 26 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD MAY 1 PY 1993 VL 32 IS 13 BP 2422 EP 2425 PG 4 WC Optics SC Optics GA KZ608 UT WOS:A1993KZ60800032 PM 20820400 ER PT J AU COTELL, CM AF COTELL, CM TI PULSED-LASER DEPOSITION AND PROCESSING OF BIOCOMPATIBLE HYDROXYLAPATITE THIN-FILMS SO APPLIED SURFACE SCIENCE LA English DT Article; Proceedings Paper CT SYMP B ON LASER, LAMP AND SYNCHROTRON ASSISTED MATERIALS SURFACE PROCESSING, AT THE 1992 E-MRS SPRING CONF CY JUN 02-05, 1992 CL STRASBOURG, FRANCE SP EUROPEAN MAT RES SOC, COUNCIL EUROPE, COMMISS EUROPEAN COMMUNITIES, BANQUE POPULAIRE, BRASSERIE KRONENBOURG, CTR RECH NUCL, CNRS, ELSEVIER SCI PUBL, VILLE STRASBOURG, OFF TOURISME, EUROPEAN PARLIAMENT ID PHOSPHATE AB Calcium phosphate-based ceramics were deposited on Ti-6Al-4V and Si substrates by pulsed laser deposition. The calcium phosphate phase (amorphous, alpha- or beta-tricalcium phosphate, tetracalcium phosphate, or hydroxylapatite), Ca/P ratio and surface morphology of the films were related to deposition conditions. Deposition of crystalline films required both elevated substrate temperature and a reactive gas environment. At substrate temperatures < 400-degrees-C, films were amorphous. Above 400-degrees-C, the gaseous environment during deposition determined the crystalline phase of the films. In Ar or in vacuum at 500-600-degrees-C, films were amorphous. In O2, deposition of alpha-tricalcium phosphate was favored between 400 and 700-degrees-C and beta-tricalcium phosphate was favored above 700-degrees-C. Films deposited in low pressures Of O2 (< 0.05 Torr) were P-deficient. The correct stoichiometry was approached as the pressure of O2 in the chamber during deposition increased. In water vapor-enriched inert gas environments, deposition of hydroxylapatite was observed at temperatures between 400 and 700-degrees-C and tetracalcium phosphate was observed at temperatures above 700-degrees-C. Adhesion of crystalline HA films deposited at 600-degrees-C in Ar/H2O was excellent, but films that were amorphous (deposited either at room temperature or in a non-reactive gas environment) and tricalcium phosphate films did not adhere well to the substrates. RP COTELL, CM (reprint author), USN,RES LAB,SURFACE MODIFICAT BRANCH,WASHINGTON,DC 20375, USA. NR 10 TC 124 Z9 127 U1 3 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-4332 J9 APPL SURF SCI JI Appl. Surf. Sci. PD MAY PY 1993 VL 69 IS 1-4 BP 140 EP 148 DI 10.1016/0169-4332(93)90495-W PG 9 WC Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Chemistry; Materials Science; Physics GA LA076 UT WOS:A1993LA07600025 ER PT J AU DELOACHBANTA, LJ TENARO, LJ AF DELOACHBANTA, LJ TENARO, LJ TI SUPERFICIAL EROSIONS WITH SOME OOZING AND MARKED CRUSTING - PEMPHIGUS ERYTHEMATOSUS (PE) SO ARCHIVES OF DERMATOLOGY LA English DT Note ID 20-YEAR RP DELOACHBANTA, LJ (reprint author), USN HOSP,SAN DIEGO,CA 92134, USA. NR 13 TC 1 Z9 1 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0003-987X J9 ARCH DERMATOL JI Arch. Dermatol. PD MAY PY 1993 VL 129 IS 5 BP 633 EP & PG 0 WC Dermatology SC Dermatology GA LB403 UT WOS:A1993LB40300015 PM 8481026 ER PT J AU LARRISON, WI FREDERICK, AR PETERSON, TJ TOPPING, TM AF LARRISON, WI FREDERICK, AR PETERSON, TJ TOPPING, TM TI POSTERIOR RETINAL FOLDS FOLLOWING VITREORETINAL SURGERY SO ARCHIVES OF OPHTHALMOLOGY LA English DT Article ID COMPLICATION; DETACHMENT AB The authors conducted a retrospective review of 32 patients with posterior retinal folds following retinal reattachment surgery. Twenty-eight of these patients underwent combined pars plana vitrectomy, fluid-air exchange with either internal drainage through a preexisting retinal break or external drainage of subretinal fluid, and scleral buckle. We believe these drainage techniques resulted in incomplete elimination of subretinal fluid, with resultant sequestration of fluid at the dependent border between attached and detached retina. Metamorphopsia and decreased visual acuity were noted in patients with folds involving the macula. The likelihood of fold formation may be greatly reduced by internal drainage through a posterior retinotomy combined with more complete removal of slowly gravitating fluid as it flows dependently to the drainage site. C1 CTR EYE RES & OPHTHALM CONSULTANTS,BOSTON,MA. USN HOSP,DEPT OPHTHALMOL,SAN DIEGO,CA 92134. RP LARRISON, WI (reprint author), CONNECTICUT RETINA CONSULTANTS,402A,46 PRINCE ST,NEW HAVEN,CT 06519, USA. NR 8 TC 24 Z9 24 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0003-9950 J9 ARCH OPHTHALMOL-CHIC JI Arch. Ophthalmol. PD MAY PY 1993 VL 111 IS 5 BP 621 EP 625 PG 5 WC Ophthalmology SC Ophthalmology GA LC120 UT WOS:A1993LC12000025 PM 8489441 ER PT J AU HENDERSON, FC GEDDES, JF CROCKARD, HA STEVENS, JW AF HENDERSON, FC GEDDES, JF CROCKARD, HA STEVENS, JW TI NEURAXIAL PATHOLOGY IN END-STAGE RHEUMATOID-ARTHRITIS SO ARTHRITIS AND RHEUMATISM LA English DT Meeting Abstract C1 USN HOSP, BETHESDA, MD 20814 USA. ROYAL LONDON HOSP TRUST, LONDON, ENGLAND. UCL NATL HOSP NEUROL & NEUROSURG, LONDON, ENGLAND. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0004-3591 J9 ARTHRITIS RHEUM-US JI Arthritis Rheum. PD MAY PY 1993 VL 36 IS 5 SU S BP R18 EP R18 PG 1 WC Rheumatology SC Rheumatology GA LD569 UT WOS:A1993LD56900073 ER PT J AU YACAVONE, DW AF YACAVONE, DW TI MISHAP TRENDS AND CAUSE FACTORS IN NAVAL AVIATION - A REVIEW OF NAVAL-SAFETY-CENTER DATA, 1986-90 SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Note AB Although the mishap rate in naval aviation has decline sustantially over the period from 1950-90, there remains a residual number of mishaps per 1 00,000 flight hours. Many of these mishaps represent human error. There seems to be an additional risk in certain air-frames and in specific missions. We reviewed mishap trends and causes for all naval aircraft over a 4-year period, 1986-90. These were graphically represented and compared, both statistically and with other methods. The mishap rates contained a significant portion of aircrew error mishaps. Of 308 total Class A mishaps, 179 (58%) were attributed to aircrew error. There were 145 (47%) attributed to supervisory error, another form of human mistakes. Thus, the most common cause factors were directly related to human failure. The effect on training is already being seen with the establishment of aircrew coordination training as one of the top priorities in the Fleet Replacement Squadrons. Studies, both underway and in press, appear to indicate a positive response to this training. RP YACAVONE, DW (reprint author), USN,MC,CTR SAFETY,DIV AEROMED,NAVAL AIR STN,NORFOLK,VA 23511, USA. NR 2 TC 21 Z9 22 U1 0 U2 1 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD MAY PY 1993 VL 64 IS 5 BP 392 EP 395 PG 4 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA LA459 UT WOS:A1993LA45900008 PM 8503813 ER PT J AU MARKOVITS, AS AF MARKOVITS, AS TI PHOTOREFRACTIVE KERATECTOMY (PRK) - THREAT OR MILLENNIUM FOR MILITARY PILOTS SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Note AB The development of the excimer laser, which is capable of correcting myopia without leaving obvious scars as does radial keratotomy, makes it certain that this promising but very new modality is something the military aviation community will be facing in the immediate future. Methods of detection are available, but are expensive and time-consuming. Should military aviation permit or even sponsor a group of PRK student pilots in order to observe them closely, and then perhaps use this new modality in place of contact lenses or even spectacles? RP MARKOVITS, AS (reprint author), USN,INST AEROSP MED,DEPT OPHTHALMOL,NAMI CODE 2,PENSACOLA,FL 32508, USA. NR 0 TC 6 Z9 6 U1 0 U2 2 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD MAY PY 1993 VL 64 IS 5 BP 409 EP 411 PG 3 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA LA459 UT WOS:A1993LA45900012 PM 8503817 ER PT J AU YACAVONE, DW AF YACAVONE, DW TI PSYCHIATRISTS CLINICAL PSYCHOLOGISTS AT SEA SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Letter RP YACAVONE, DW (reprint author), USN,MC,CAPT,MPH,DO,CTR SAFETY,DIV AEROMED,NAS NORFOLK,VA, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD MAY PY 1993 VL 64 IS 5 BP 418 EP 418 PG 1 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA LA459 UT WOS:A1993LA45900018 PM 8503821 ER PT J AU KARLE, IL FLIPPENANDERSON, JL UMA, K BALARAM, P AF KARLE, IL FLIPPENANDERSON, JL UMA, K BALARAM, P TI UNFOLDING OF AN ALPHA-HELIX IN PEPTIDE CRYSTALS BY SOLVATION - CONFORMATIONAL FRAGILITY IN A HEPTAPEPTIDE SO BIOPOLYMERS LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; AMINOISOBUTYRIC-ACID; AMINO-ACIDS; FORMING TENDENCIES; DESIGN; STEREOCHEMISTRY; ALAMETHICIN; PROTEINS; RESIDUES AB The structure of the peptide Boc-Val-Ala-Leu-Aib-Val-Ala-Leu-OMe has been determined in crystals obtained from a dimethylsulfoxide-isopropanol mixture. Crystal parameters are as follows: C38H69N7O10.H2O.2C3H7OH, space group P2(1), a = 10.350 (2) angstrom, b = 26.084 (4) angstrom, c = 10.395(2) angstrom, beta = 96.87(12), Z = 2, R = 8.7% for 2686 reflections observed > 3.0 sigma(F). A single 5 --> 1 hydrogen bond is observed at the N-terminus, while two 4 --> 1 hydrogen bonds characteristic of a 3(10)-helix are seen in the central segment. The C-terminus residues, Ala(6) and Leu(7) are extended, while Val(5) is considerably distorted from a helical conformation. Two isopropanol molecules make hydrogen bonds to the C-terminal segment, while a water molecule interacts with the N-terminus. The structure is in contrast to that obtained for the same peptide in crystals from methanol-water [I. L. Karle, J. L. Flippen-Anderson, K. Uma, and P. Balaram (1990) Proteins: Structure, Function and Genetics, Vol. 7, pp. 62-73] in which two independent molecules reveal an almost perfect alpha-helix and a helix penetrated by a water molecule. A comparison of the three structures provides a snapshot of the progressive effects of solvation leading to helix unwinding. The fragility of the heptapeptide helix in solution is demonstrated by nmr studies in CDCl3 and (CD3)2SO. A helical conformation is supported in the apolar solvent CDCl3, whereas almost complete unfolding is observed in the strongly solvating medium (CD3)2SO. C1 INDIAN INST SCI,BANGALORE 560012,KARNATAKA,INDIA. RP KARLE, IL (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. FU NIGMS NIH HHS [GM-30902] NR 41 TC 55 Z9 55 U1 0 U2 2 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0006-3525 J9 BIOPOLYMERS JI Biopolymers PD MAY PY 1993 VL 33 IS 5 BP 827 EP 837 DI 10.1002/bip.360330511 PG 11 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA KZ440 UT WOS:A1993KZ44000010 PM 8343578 ER PT J AU HUANG, A CAMPBELL, J AF HUANG, A CAMPBELL, J TI A SIMPLE IMPROVEMENT TO THE TRITON LYSIS PROCEDURE FOR PLASMID ISOLATION SO BIOTECHNIQUES LA English DT Note C1 USN,RES LAB,WASHINGTON,DC 20375. GEOCTR,FT WASHINGTON,MD 20744. NR 1 TC 1 Z9 1 U1 0 U2 0 PU EATON PUBLISHING CO PI NATICK PA 154 E. CENTRAL ST, NATICK, MA 01760 SN 0736-6205 J9 BIOTECHNIQUES JI Biotechniques PD MAY PY 1993 VL 14 IS 5 BP 730 EP 730 PG 1 WC Biochemical Research Methods; Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA LA812 UT WOS:A1993LA81200008 PM 8512688 ER PT J AU WATTS, RJ MCGUIRE, PN HOEPPEL, RE AF WATTS, RJ MCGUIRE, PN HOEPPEL, RE TI A SIMPLE METHOD FOR CONDUCTING LABORATORY TREATABILITY STUDIES TO ASSESS POTENTIAL FOR INSITU BIOREMEDIATION SO BIOTECHNOLOGY TECHNIQUES LA English DT Article AB A simple, sealed flask system for conducting laboratory treatability studies to assess potential for in situ bioremediation was developed, evaluated, and compared to treatability studies which were open to the atmosphere. The treatability studies were conducted in 40 ml volatile organic analysis (VOA) vials fitted with Teflon septum caps. Contaminant loss was significantly less in the sealed-flasks relative to systems open to the atmosphere. C1 BLASLAND & BAUCK ENGINEERS PC,SYRACUSE,NY 13214. USN,DIV ENVIRONM PROTECT,CIVIL ENGN LAB,PORT HUENEME,CA 94043. RP WATTS, RJ (reprint author), WASHINGTON STATE UNIV,DEPT CIVIL & ENVIRONM ENGN,PULLMAN,WA 99164, USA. NR 8 TC 0 Z9 0 U1 1 U2 4 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0951-208X J9 BIOTECHNOL TECH JI Biotechnol. Tech. PD MAY PY 1993 VL 7 IS 5 BP 385 EP 390 DI 10.1007/BF00152546 PG 6 WC Biochemical Research Methods; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA LC030 UT WOS:A1993LC03000012 ER PT J AU PINDER, ADJ FOTHERGILL, DM GRIEVE, DW AF PINDER, ADJ FOTHERGILL, DM GRIEVE, DW TI SYSTEM FOR THE TRIAXIAL MEASUREMENT OF MANUAL FORCE EXERTIONS SO CLINICAL BIOMECHANICS LA English DT Article DE 3D PSD; ASYMMETRY; BIOMECHANICS INSTRUMENTATION; EQUIPMENT DESIGN; HUMAN STRENGTH; TAFS; TRIAXIAL MEASUREMENT AB A triaxial force measurement system has been developed to allow the measurement of whole-body manual force exertions in the three axes of the Cartesian system. The design of the system precludes the exertion of torques, thus enabling a description of the linear forces that an individual can exert in three dimensions. Forces are measured independently for each hand, allowing the examination of triaxial forces in both one- and two-handed whole-body exertions, and the analysis of the forces in the closed chain of the upper limbs in two-handed exertions. The hardware and computer software that constitute the triaxial force measurement system are described, as are the method of calibration used and the accuracy of the system. C1 ROYAL FREE HOSP,SCH MED,DEPT ANAT,HUMAN PERFORMANCE LAB,ROWLAND HILL ST,LONDON NW3 2PF,ENGLAND. USN,MED RES INST,DIVING BIOMED TECHNOL FUNCT AREA,BETHESDA,MD 20814. NR 14 TC 3 Z9 3 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0268-0033 J9 CLIN BIOMECH JI Clin. Biomech. PD MAY PY 1993 VL 8 IS 3 BP 120 EP 126 DI 10.1016/0268-0033(93)90052-J PG 7 WC Engineering, Biomedical; Orthopedics; Sport Sciences SC Engineering; Orthopedics; Sport Sciences GA LC057 UT WOS:A1993LC05700002 PM 23915939 ER PT J AU EYRE, DP AF EYRE, DP TI ORGANIZATIONS AND NATION-STATES - NEW PERSPECTIVES ON CONFLICT AND COOPERATION - KAHN,RL, ZALD,MN SO CONTEMPORARY SOCIOLOGY-A JOURNAL OF REVIEWS LA English DT Book Review C1 STANFORD UNIV,STANFORD,CA 94305. RP EYRE, DP (reprint author), USN,POSTGRAD SCH,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER SOCIOLOGICAL ASSOC PI WASHINGTON PA 1722 N ST NW, WASHINGTON, DC 20036-2981 SN 0094-3061 J9 CONTEMP SOCIOL JI Contemp. Sociol.-J. Rev. PD MAY PY 1993 VL 22 IS 3 BP 400 EP 401 DI 10.2307/2074527 PG 2 WC Sociology SC Sociology GA LJ378 UT WOS:A1993LJ37800075 ER PT J AU NORCROSS, MC MITCHELL, DF AF NORCROSS, MC MITCHELL, DF TI BLISTERING DISTAL DACTYLITIS CAUSED BY STAPHYLOCOCCUS-AUREUS SO CUTIS LA English DT Article AB Blistering distal dactylitis is a superficial infection of the anterior fat pad on the volar surface of the distal portion of ordinarily a single finger. Although most commonly caused by group A beta-hemolytic streptococci, we report a case of blistering distal dactylitis caused by Staphylococcus aureus involving all the fingers and thumbs of a child; After results of a Gram's stain and culture established the diagnosis, the child responded rapidly to oral amoxicillin trihydrate/clavulanate potassium (Augmentin(R)). Multiple fingers affected in blistering distal dactylitis may be a predictor of S. aureus as the causative agent. C1 USN HOSP,DEPT FAMILY PRACTICE,CHARLESTON,SC. USN HOSP,DEPT DERMATOL,CHARLESTON,SC. NR 7 TC 13 Z9 13 U1 0 U2 0 PU EXCERPTA MEDICA INC PI NEW YORK PA 245 WEST 17TH STREET, NEW YORK, NY 10011 SN 0011-4162 J9 CUTIS JI Cutis PD MAY PY 1993 VL 51 IS 5 BP 353 EP 354 PG 2 WC Dermatology SC Dermatology GA PK093 UT WOS:A1993PK09300008 PM 8513687 ER PT J AU CHURCHILL, JH LEVINE, ER CONNORS, DN CORNILLON, PC AF CHURCHILL, JH LEVINE, ER CONNORS, DN CORNILLON, PC TI MIXING OF SHELF, SLOPE AND GULF-STREAM WATER OVER THE CONTINENTAL-SLOPE OF THE MIDDLE ATLANTIC BIGHT SO DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS LA English DT Article ID WARM-CORE RING; NEW-ENGLAND; HYDROGRAPHIC STRUCTURE; FINE-STRUCTURE; CAPE-HATTERAS; SALT FINGERS; VELOCITY; ENTRAINMENT; EDDIES; EDDY AB A combination of water masses was observed over the continental slope between Cape Hatteras and Hudson Canyon following the passage of a Gulf Stream meander. It was largely made up of fluid discharged from the Gulf Stream in the wake of the meander and also contained intrusions of Middle Atlantic Bight (MAB) shelf water and slope water. Its most prominent dynamical feature was an anticyclonic eddy that had an initial diameter of about 100 km but contained relatively weak currents, not greater than 30 cm s-1 in magnitude. Discharged Gulf Stream water made up the eddy's core, and a band of entrained shelf water circulated at its margin. This band was connected with another entrained shelf water band that flowed along the northern margin of the Gulf Stream. Transport of the shelf water at the edge of the eddy was estimated to be 1.3 x 10(5) m3 s-1, which is comparable with the estimated alongshore transport of water over the MAB shelf. Vigorous mixing of both shelf water bands with surrounding discharged Gulf Stream water is indicated by the large differences of the latter's TIS properties from those found within the Gulf Stream. These differences were used to estimate salt fluxes into the shelf water band at the edge of the anticyclonic eddy, with results in the range of 1.9-6.6 x 10(-6) g salt cm-2 s-1. Density ratios and Richardson numbers determined from hydrographic data suggest that these salt fluxes were primarily the result of mixing by double diffusive processes, and that shear-induced turbulence combined with double diffusion to effect vertical mixing at the margins of the shelf water band next to the Gulf Stream. C1 USN,CTR UNDERWATER SYST,NEWPORT,RI 02841. UNIV RHODE ISL,GRAD SCH OCEANOG,KINGSTON,RI 02881. RP CHURCHILL, JH (reprint author), WOODS HOLE OCEANOG INST,WOODS HOLE,MA 02543, USA. NR 40 TC 42 Z9 42 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0967-0637 J9 DEEP-SEA RES PT I JI Deep-Sea Res. Part I-Oceanogr. Res. Pap. PD MAY PY 1993 VL 40 IS 5 BP 1063 EP 1085 DI 10.1016/0967-0637(93)90090-P PG 23 WC Oceanography SC Oceanography GA LF852 UT WOS:A1993LF85200012 ER PT J AU SHIFLER, DA MORAN, PJ KRUGER, J AF SHIFLER, DA MORAN, PJ KRUGER, J TI PASSIVITY OF 1018 CARBON-STEEL IN DIMETHOXYETHANE WITH LIASF6 - OBSERVATION OF ELECTROPOLYMERIZATION SO ELECTROCHIMICA ACTA LA English DT Article DE PASSIVITY; ORGANIC SOLVENTS; BREAKDOWN OF PASSIVITY ELECTROPOLYMERIZATION; ETHERS ID PROPYLENE CARBONATE; LITHIUM CELLS; TETRAHYDROFURAN; ELECTROLYTES; FLUOBORATE; COMPLEXES; PYRROLE; FILMS; ETHER AB The passivity and breakdown of passivity of 1018 carbon steel in dimethoxyethane with 0.5 M LiAsF6 was studied by electrochemical and surface analytical techniques. Carbon steel exhibits passivity over a large anodic potential range. Several different passivation mechanisms, including solvent adsorption, operate in this potential domain. In addition, another passivation mechanism involving electropolymerization of the solvent and complexation the LiAsF6 was observed. A polymer film did not form in supporting electrolytes other than LiAsF6. The effects of small amounts of water on the extent of the passive region and the possibility of polymer growth are discussed. C1 USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402. RP SHIFLER, DA (reprint author), JOHNS HOPKINS UNIV,DEPT MAT SCI & ENGN,BALTIMORE,MD 21218, USA. NR 41 TC 13 Z9 13 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-4686 J9 ELECTROCHIM ACTA JI Electrochim. Acta PD MAY PY 1993 VL 38 IS 7 BP 881 EP 888 DI 10.1016/0013-4686(93)87005-X PG 8 WC Electrochemistry SC Electrochemistry GA KW618 UT WOS:A1993KW61800004 ER PT J AU NIENHUIS, AW DONAHUE, RE KESSLER, SW BODINE, D MCDONAGH, K DUNBAR, C WALSH, C GOODMAN, S LIU, J YOUNG, NS AF NIENHUIS, AW DONAHUE, RE KESSLER, SW BODINE, D MCDONAGH, K DUNBAR, C WALSH, C GOODMAN, S LIU, J YOUNG, NS TI GENE-THERAPY APPROACHES FOR ENZYME DEFICIENCIES SO EXPERIMENTAL HEMATOLOGY LA English DT Meeting Abstract C1 NHLBI,CLIN HEMATOL BRANCH,BETHESDA,MD 20892. USN,RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD. NR 0 TC 0 Z9 0 U1 0 U2 0 PU CARDEN JENNINGS PUBL CO LTD PI CHARLOTTESVILLE PA BLAKE CTR, STE 200, 1224 W MAIN ST, CHARLOTTESVILLE, VA 22903 SN 0301-472X J9 EXP HEMATOL JI Exp. Hematol. PD MAY PY 1993 VL 21 IS 5 BP 716 EP 716 PG 1 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA MW610 UT WOS:A1993MW61000041 ER PT J AU NOAKES, MD CAIN, JB NIETO, JW ALTHOUSE, EL AF NOAKES, MD CAIN, JB NIETO, JW ALTHOUSE, EL TI AN ADAPTIVE LINK ASSIGNMENT ALGORITHM FOR DYNAMICALLY CHANGING TOPOLOGIES SO IEEE TRANSACTIONS ON COMMUNICATIONS LA English DT Article AB This paper presents an adaptive link assignment algorithm for the distributed optimization of dynamically changing network topologies. The algorithm is responsible for determining the network connectivity by controlling the selection of links to be established and disconnected. This algorithm is designed to recover from predictable link outages as well as massive unpredictable failures. To minimize computational time complexity as well as to improve transient response, we are utilizing some known graph-theoretic algorithms. C1 HARRIS CORP,DEPT ADV TECHNOL,MELBOURNE,FL 32901. SIGMA XI,RES TRIANGLE PK,NC. USN,RES LAB,DIV INFORMAT TECHNOL,COMMUN SYST BRANCH,WASHINGTON,DC 20375. NR 11 TC 15 Z9 19 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 0090-6778 J9 IEEE T COMMUN JI IEEE Trans. Commun. PD MAY PY 1993 VL 41 IS 5 BP 694 EP 706 DI 10.1109/26.225485 PG 13 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA LR656 UT WOS:A1993LR65600010 ER PT J AU PERINI, J COHEN, LS AF PERINI, J COHEN, LS TI DESIGN OF BROAD-BAND RADAR-ABSORBING MATERIALS FOR LARGE ANGLES OF INCIDENCE SO IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY LA English DT Article AB A numerical technique, called (modified) Powell method, is used to design radar-absorbing materials (RAM's), made up of several dielectric layers, usually on top of a conducting (ground) plane. The absorption of RF energy is mostly done in the last layer. The others are used to match the wave impedance of the RAM to that of the incidence media for the desired angles of incidence, frequencies, and polarizations. The technique is very flexible, allowing the design of RAM's tailored for specific applications or general use. One important example is the design of RAM's that can maintain a minimum absorption rate from normal to almost grazing incidence, over a specified frequency bandwidth. C1 SYRACUSE UNIV,DEPT ECE,NEW SMYRNA BEACH,FL 32169. USN,RES LAB,DIV RADAR,SEARCH RADAR BRANCH,WASHINGTON,DC 20375. NR 7 TC 32 Z9 33 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 0018-9375 J9 IEEE T ELECTROMAGN C JI IEEE Trans. Electromagn. Compat. PD MAY PY 1993 VL 35 IS 2 BP 223 EP 230 DI 10.1109/15.229418 PN 1 PG 8 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA LG950 UT WOS:A1993LG95000013 ER PT J AU DIXON, DS OBARA, M SCHADE, N AF DIXON, DS OBARA, M SCHADE, N TI FINITE-ELEMENT ANALYSIS (FEA) AS AN EMC PREDICTION TOOL SO IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY LA English DT Note AB As electronic system complexity increases, the design and analysis tools must keep pace. In the mechanics, structures, and fluids disciplines, numerical tools, such as finite-element analysis (FEA) have become commonplace in the designers tool kit. In electromagnetics (EM) such analysis tools are still in their infancy. Electromagnetic compatibility (EMC) analysis has been primarily limited to the analysis of simple equivalent circuit models or measurements of a completed design. Few reliable methods exist to predict the EMC of a complex system or group of systems before it leaves the designer's desk. Powerful electromagnetic software based on FEA techniques is now becoming commercially available. These programs are potentially capable of analyzing the complex electromagnetic environment surrounding modern shipboard electronic systems and/or antennas. This paper discusses the output of one FEA program used as a compartmental EMC predictive tool. The FEA program results are compared to the calculated results from a typical radiating EMI source, a radiating wire over a ground plane, and compares both predictions with validating measurements. RP DIXON, DS (reprint author), USN,CTR UNDERSEA WARFARE,CODE 3431,NEW LONDON,CT 06320, USA. NR 7 TC 10 Z9 11 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9375 J9 IEEE T ELECTROMAGN C JI IEEE Trans. Electromagn. Compat. PD MAY PY 1993 VL 35 IS 2 BP 241 EP 248 DI 10.1109/15.229415 PN 1 PG 8 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA LG950 UT WOS:A1993LG95000016 ER PT J AU GABRIELSON, TB AF GABRIELSON, TB TI MECHANICAL-THERMAL NOISE IN MICROMACHINED ACOUSTIC AND VIBRATION SENSORS SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article ID SILICON AB Since the introduction of the micromachining process, wherein mechanical structures are etched from blocks of silicon, a number of very small acoustic and vibration sensors have been built. This size reduction is attractive for many applications but the small moving parts are especially susceptible to mechanical noise resulting from molecular agitation. For sensors designed for small-signal applications (microphones and hydrophones, for example), this mechanical-thermal noise is often one of the limiting noise components. While this component is often neglected in design and analysis, it is relatively easy to estimate, since, like electrical-thermal noise, the magnitude of mechanical-thermal noise depends only on temperature and the magnitude of mechanical damping. This paper reviews several techniques for calculating the mechanical-thermal noise in acoustic and vibration sensors in general and in micro-machined sensors in particular. RP GABRIELSON, TB (reprint author), USN,CTR AIR WARFARE,CODE 5044,WARMINSTER,PA 18974, USA. NR 32 TC 393 Z9 416 U1 3 U2 64 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 MAY PY 1993 VL 40 IS 5 BP 903 EP 909 DI 10.1109/16.210197 PG 7 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA KX519 UT WOS:A1993KX51900010 ER PT J AU ZAIDMAN, EG AF ZAIDMAN, EG TI SIMULATION OF FIELD-EMISSION MICROTRIODES SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article AB Vacuum microtriode RF amplifier performance, based upon a unit cell with a conical field emitter tip, gate, and anode, was evaluated via computer simulation. Electron emission was calculated from the Fowler-Nordheim equation. The dependence of emitted current, transconductance, and field enhancement upon geometrical factors, e.g., tip sharpness, tip height, cone half-angle, and gate hole radius, is shown. The device design parameters of transconductance, cutoff frequency, small signal gain, and efficiency, have been calculated. Electron streamlines and current flux are shown for time-dependent RF input. Because a compact electron beam source has wide application, the normalized beam emittance, brightness, and beam quality are calculated for a typical case. Potential difficulties with anode power deposition are noted. RP ZAIDMAN, EG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 TC 34 Z9 34 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD MAY PY 1993 VL 40 IS 5 BP 1009 EP 1016 DI 10.1109/16.210212 PG 8 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA KX519 UT WOS:A1993KX51900025 ER PT J AU GERLACH, K SANGSTON, KJ AF GERLACH, K SANGSTON, KJ TI ROBUST LOCALLY OPTIMUM DETECTION OF SIGNALS IN DEPENDENT NOISE SO IEEE TRANSACTIONS ON INFORMATION THEORY LA English DT Letter DE HYPOTHESIS TESTING; LOCALLY OPTIMUM DETECTOR; BAYES RISK; ROBUST DETECTION; NON-GAUSSIAN NOISE AB A robust locally optimum detector of a signal embedded in additive dependent non-Gaussian noise is presented. The performance criterion is Bayes risk, the sample size is finite, and the uncertainty class of the multivariate inputs is the epsilon-contamination model. The locally optimum detector is shown to be a censored version of the nominal likelihood ratio. RP GERLACH, K (reprint author), USN,RES LAB,CODE 5341,4555 OVERLOOK AVE,WASHINGTON,DC 20375, USA. NR 13 TC 4 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9448 J9 IEEE T INFORM THEORY JI IEEE Trans. Inf. Theory PD MAY PY 1993 VL 39 IS 3 BP 1040 EP 1043 DI 10.1109/18.256510 PG 4 WC Computer Science, Information Systems; Engineering, Electrical & Electronic SC Computer Science; Engineering GA LM873 UT WOS:A1993LM87300028 ER PT J AU BERZINS, V LUQI YEHUDAI, A AF BERZINS, V LUQI YEHUDAI, A TI USING TRANSFORMATIONS IN SPECIFICATION-BASED PROTOTYPING SO IEEE TRANSACTIONS ON SOFTWARE ENGINEERING LA English DT Article DE EXECUTABLE SPECIFICATION; PROGRAM TRANSFORMATIONS; SOFTWARE EVOLUTION; SOFTWARE PROTOTYPING ID PROGRAM TRANSFORMATION; SOFTWARE; SYSTEM; REUSABILITY AB We explore the use of software transformations for software evolution. Meaning-preserving program transformations have been widely used for program development from a fixed initial specification. We consider a wider class of transformations to support development in which the specification evolves, rather than being fixed in advance. We present a new and general classification of transformations based on their effect on system interfaces, externally observable behavior, and abstraction level of a system description. This classification is used to rearrange chronological derivation sequences containing meaning-changing transformations into lattices containing only meaning-preserving transformations. This paper describes a process model for software evolution, utilizing prototyping techniques, and shows how this class of transformations can be used to support such a process. A set of examples illustrates our ideas. Software tool support and directions for future research are discussed. RP BERZINS, V (reprint author), USN,POSTGRAD SCH,DEPT COMP SCI,MONTEREY,CA 93943, USA. NR 40 TC 14 Z9 17 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 0098-5589 J9 IEEE T SOFTWARE ENG JI IEEE Trans. Softw. Eng. PD MAY PY 1993 VL 19 IS 5 BP 436 EP 452 DI 10.1109/32.232011 PG 17 WC Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA LU569 UT WOS:A1993LU56900002 ER PT J AU KRAMER, B LUQI BERZINS, V AF KRAMER, B LUQI BERZINS, V TI COMPOSITIONAL SEMANTICS OF A REAL-TIME PROTOTYPING LANGUAGE SO IEEE TRANSACTIONS ON SOFTWARE ENGINEERING LA English DT Article DE ALGEBRAIC HIGH-LEVEL PETRI NETS; DISTRIBUTED SYSTEMS; FORMAL SEMANTICS; REAL-TIME SYSTEMS; SPECIFICATION AND DESIGN; TIME CONSTRAINTS ID COLORED PETRI NETS; HIGH-LEVEL NETS; ALGEBRAIC SPECIFICATIONS; SYSTEMS AB A formal semantics of a prototyping language for hard real-time systems, PSDL, is given. PSDL provides a data How notation augmented by application-orientation timing and control constraints to describe a system as a hierarchy of networks of processing units communicating via data streams. The semantics of PSDL is defined in terms of algebraic high-level Petri nets. This formalism combines algebraic specifications of abstract data types with process and concurrency concepts of Petri nets. Its data abstraction facilities are used to define the meaning of PSDL data types, while high-level Petri nets serve to model the casual and timing behavior of a system. The net model exposes potential concurrency of computation and makes all synchronization needs implied by timing and control constraints explicit and precise. Time is treated as state of clocks, and clocks are modeled as ordinary system components. The net semantics provides the basis for applying analysis techniques and semantic tools available for high-level Petri nets. C1 USN, POSTGRAD SCH, DEPT COMP SCI, MONTEREY, CA 93943 USA. NR 39 TC 9 Z9 10 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1314 USA SN 0098-5589 EI 1939-3520 J9 IEEE T SOFTWARE ENG JI IEEE Trans. Softw. Eng. PD MAY PY 1993 VL 19 IS 5 BP 453 EP 477 DI 10.1109/32.232012 PG 25 WC Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA LU569 UT WOS:A1993LU56900003 ER PT J AU ATKINSON, RD AF ATKINSON, RD TI DOCUMENTING THE SOFTWARE-DEVELOPMENT PROCESS - A HANDBOOK OF STRUCTURED TECHNIQUES - AYER,S, PATRINOSTRO,F SO INFORMATION PROCESSING & MANAGEMENT LA English DT Book Review RP ATKINSON, RD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 1 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 0306-4573 J9 INFORM PROCESS MANAG JI Inf. Process. Manage. PD MAY-JUN PY 1993 VL 29 IS 3 BP 403 EP 403 DI 10.1016/0306-4573(93)90070-T PG 1 WC Computer Science, Information Systems; Information Science & Library Science SC Computer Science; Information Science & Library Science GA LE078 UT WOS:A1993LE07800016 ER PT J AU ROBINSON, GE AF ROBINSON, GE TI THE ROLE OF THE PROFESSIONAL MIDDLE-CLASS IN THE MOBILIZATION OF PALESTINIAN SOCIETY - THE MEDICAL AND AGRICULTURAL COMMITTEES SO INTERNATIONAL JOURNAL OF MIDDLE EAST STUDIES LA English DT Article RP ROBINSON, GE (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 15 TC 7 Z9 7 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0020-7438 J9 INT J MIDDLE E STUD JI Int. J. Middle East Stud. PD MAY PY 1993 VL 25 IS 2 BP 301 EP 326 PG 26 WC Area Studies SC Area Studies GA KY164 UT WOS:A1993KY16400008 ER PT J AU LOONEY, R AF LOONEY, R TI A QUESTION OF INTEREST - THE PARALYSIS OF SAUDI BANKING - WILSON,PW SO INTERNATIONAL JOURNAL OF MIDDLE EAST STUDIES LA English DT Book Review RP LOONEY, R (reprint author), USN,POSTGRAD SCH,NATL SECUR AFFAIRS,MONTEREY,CA 93940, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0020-7438 J9 INT J MIDDLE E STUD JI Int. J. Middle East Stud. PD MAY PY 1993 VL 25 IS 2 BP 355 EP 356 PG 2 WC Area Studies SC Area Studies GA KY164 UT WOS:A1993KY16400023 ER PT J AU SADANANDA, K FENG, CR AF SADANANDA, K FENG, CR TI THE CREEP OF INTERMETALLICS AND THEIR COMPOSITES SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Article ID GRAIN-SIZE; ALLOYS AB This article evaluates the creep behavior of nickel aluminides, titanium aluminides,and molybdenum disilicides and their composites as a function of stress and temperature. Significant improvements in creep strength were achieved in NiAl by the addition of HfC dispersoids, and in MoSi2 and its alloys through the addition of SiC whiskers or particulates. On the basis of creep resistance, molybdenum disilicide alloys and their composites have a high potential for application at temperatures greater than 1,000-degrees-C, and they are also potential competitors to more brittle ceramic-ceramic composites. RP SADANANDA, K (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 22 TC 3 Z9 3 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD MAY PY 1993 VL 45 IS 5 BP 45 EP 48 PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA LB547 UT WOS:A1993LB54700009 ER PT J AU HEBBAR, SK PLATZER, MF KWON, HM AF HEBBAR, SK PLATZER, MF KWON, HM TI VORTEX BREAKDOWN STUDIES OF A CANARD-CONFIGURED X-31A-LIKE FIGHTER AIRCRAFT MODEL SO JOURNAL OF AIRCRAFT LA English DT Note RP HEBBAR, SK (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0021-8669 J9 J AIRCRAFT JI J. Aircr. PD MAY-JUN PY 1993 VL 30 IS 3 BP 405 EP 408 DI 10.2514/3.46350 PG 4 WC Engineering, Aerospace SC Engineering GA LF304 UT WOS:A1993LF30400020 ER PT J AU CONE, EJ DICKERSON, S PAUL, BD MITCHELL, JM AF CONE, EJ DICKERSON, S PAUL, BD MITCHELL, JM TI FORENSIC DRUG-TESTING FOR OPIATES .5. URINE TESTING FOR HEROIN, MORPHINE, AND CODEINE WITH COMMERCIAL OPIATE IMMUNOASSAYS SO JOURNAL OF ANALYTICAL TOXICOLOGY LA English DT Article ID GAS-CHROMATOGRAPHY; 6-ACETYLMORPHINE; METABOLITE; ASSAY C1 USN,DRUG SCREENING LAB,NORFOLK,VA 23511. USN,DRUG SCREENING LAB,JACKSONVILLE,FL 32212. RP CONE, EJ (reprint author), NIDA,POB 5180,ADDICT RES CTR,BALTIMORE,MD 21224, USA. NR 12 TC 23 Z9 23 U1 1 U2 3 PU PRESTON PUBLICATIONS INC PI NILES PA 7800 MERRIMAC AVE PO BOX 48312, NILES, IL 60648 SN 0146-4760 J9 J ANAL TOXICOL JI J. Anal. Toxicol. PD MAY-JUN PY 1993 VL 17 IS 3 BP 156 EP 164 PG 9 WC Chemistry, Analytical; Toxicology SC Chemistry; Toxicology GA LD480 UT WOS:A1993LD48000007 PM 8336489 ER PT J AU CONE, EJ HUESTIS, MA MITCHELL, JM AF CONE, EJ HUESTIS, MA MITCHELL, JM TI DO CONSECUTIVE URINE CATCHES DIFFER IN MARIJUANA METABOLITE CONCENTRATION SO JOURNAL OF ANALYTICAL TOXICOLOGY LA English DT Letter C1 USN,DRUG SCREENING LAB,JACKSONVILLE,FL 32212. RP CONE, EJ (reprint author), NIDA,ADDICT RES CTR,POB 5180,BALTIMORE,MD 21224, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU PRESTON PUBLICATIONS INC PI NILES PA 7800 MERRIMAC AVE PO BOX 48312, NILES, IL 60648 SN 0146-4760 J9 J ANAL TOXICOL JI J. Anal. Toxicol. PD MAY-JUN PY 1993 VL 17 IS 3 BP 186 EP 187 PG 2 WC Chemistry, Analytical; Toxicology SC Chemistry; Toxicology GA LD480 UT WOS:A1993LD48000012 PM 8336494 ER PT J AU HUBBARD, RF SLINKER, SP FERNSLER, RF JOYCE, G LAMPE, M AF HUBBARD, RF SLINKER, SP FERNSLER, RF JOYCE, G LAMPE, M TI SIMULATION OF ELECTRON-BEAM TRANSPORT IN LOW-PRESSURE GAS CONDITIONING CELLS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ION-FOCUSED REGIME; HOSE INSTABILITY; CHANNEL; PROPAGATION AB The resistive hose instability can disrupt propagation of self-pinched beams in dense gas. To reduce growth of the instability, beams can be conditioned prior to propagation. The objectives of beam conditioning are to center the beam in order to reduce initial transverse perturbations which seed the hose instability, and to ''tailor'' the beam emittance in order to detune the head-to-tail coherence of the instability. Emittance tailoring can be performed by transporting the beam through a ''passive ion-focused regime'' (IFR) cell, a low-pressure gas cell that induces a head-to-tail taper of the beam radius. The radius taper is then converted to an emittance taper by passing the beam through a thick exit foil which scatters the beam. Beam centering can be accomplished by transporting the beam through either: (i) a passive IFR cell that is narrow enough to provide wall guiding, or (ii) a laser-ionized ''active'' IFR cell, or (iii) a wire cell in which the centering is provided by a current-carrying wire. Axisymmetric particle simulation studies of IFR tailoring cells, alone and in tandem with each of these types of centering cells, and also the effect of supplementary focusing lenses and conducting foils are reported. The parameter choices that are conducive to effective beam conditioning are discussed. The emphasis is on conditioning configurations and beam parameters that have actually been tested in experiments with the Advanced Test Accelerator and SuperIBEX accelerator. RP HUBBARD, RF (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 63 TC 6 Z9 6 U1 1 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 MAY 1 PY 1993 VL 73 IS 9 BP 4181 EP 4196 DI 10.1063/1.352853 PG 16 WC Physics, Applied SC Physics GA LA320 UT WOS:A1993LA32000009 ER PT J AU JENSEN, KL GANGULY, AK AF JENSEN, KL GANGULY, AK TI NUMERICAL-SIMULATION OF FIELD-EMISSION AND TUNNELING - A COMPARISON OF THE WIGNER FUNCTION AND TRANSMISSION COEFFICIENT APPROACHES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID PHASE-SPACE DESCRIPTION; PARTICLE TRAJECTORIES; QUANTUM-TRANSPORT; SELF-CONSISTENT; INTRINSIC BISTABILITY; BOUNDARY-CONDITIONS; IV CHARACTERISTICS; BARRIER STRUCTURES; DEVICES; HETEROSTRUCTURES AB Quantum transport through one-dimensional potential barriers is usually analyzed using either the transmission coefficient (TC) or the Wigner distribution function (WDF) approach. Fast, accurate, and efficient numerical algorithms are developed for each and are compared for (a) calculating current-field relationships for field-emission potentials with silicon parameters (and current-voltage relationships for resonant tunneling diodes), (b) their ability to accommodate scattering, self-consistency, and time dependence, and for (c) the behavior of their ''particle trajectory'' interpretations. In making the comparisons, the concern will be on the ability of each method to be incorporated into a larger ensemble-particle Monte Carlo simulation; it is argued that, in this regard, the WDF approach has significant advantages. Since the TC calculations rely on the Airy function approach, a detailed comparison of this method is made with the widely used Wentzel-Kramers-Brillouin and Fowler-Nordheim approaches for the general problem of field emission from a material into the vacuum. RP JENSEN, KL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Jensen, Kevin/I-1269-2015 OI Jensen, Kevin/0000-0001-8644-1680 NR 91 TC 54 Z9 57 U1 0 U2 12 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 1 PY 1993 VL 73 IS 9 BP 4409 EP 4427 DI 10.1063/1.352779 PG 19 WC Physics, Applied SC Physics GA LA320 UT WOS:A1993LA32000043 ER PT J AU KUZNIA, JN KHAN, MA OLSON, DT KAPLAN, R FREITAS, J AF KUZNIA, JN KHAN, MA OLSON, DT KAPLAN, R FREITAS, J TI INFLUENCE OF BUFFER LAYERS ON THE DEPOSITION OF HIGH-QUALITY SINGLE-CRYSTAL GAN OVER SAPPHIRE SUBSTRATES SO JOURNAL OF APPLIED PHYSICS LA English DT Note ID CHEMICAL VAPOR-DEPOSITION; ELECTRICAL-PROPERTIES; STIMULATED-EMISSION; ROOM-TEMPERATURE; GROWTH; FILMS AB Recently several research groups, including ours, have reported on the deposition of extremely high quality single crystal GaN layers over sapphire substrates. One of the keys to obtaining the high quality was the use of a thin AlN or GaN buffer layer between the sapphire substrate and the grown film. In this communication, we discuss the crystallinity and the influence of the buffer layer in controlling the crystalline, optical, and the electrical properties of the GaN depositions. We also compare the use of GaN and AlN as the buffer layer material. Our results indicate that the buffer layer thickness and the total film thickness are the key factors controlling the electrical, optical, and crystalline properties of the GaN depositions over sapphire substrates. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KUZNIA, JN (reprint author), APA OPT INC,2950 NE 84TH LANE,BLAINE,MN 55434, USA. NR 11 TC 150 Z9 155 U1 1 U2 16 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 1 PY 1993 VL 73 IS 9 BP 4700 EP 4702 DI 10.1063/1.354069 PG 3 WC Physics, Applied SC Physics GA LA320 UT WOS:A1993LA32000093 ER PT J AU NOVOTNY, JA PARKER, EC SURVANSHI, SS ALBIN, GW HOMER, LD AF NOVOTNY, JA PARKER, EC SURVANSHI, SS ALBIN, GW HOMER, LD TI CONTRIBUTION OF TISSUE LIPID TO LONG XENON RESIDENCE TIMES IN MUSCLE SO JOURNAL OF APPLIED PHYSIOLOGY LA English DT Article DE INERT GAS; MATHEMATICAL MODEL; DECOMPRESSION MODELING ID BLOOD-FLOW; INERT-GAS; MICROSPHERE; CLEARANCE AB Experiments demonstrate that the mean residence time of an inert gas in tissue is longer than that predicted by a single-compartment model of gas exchange. Also the relative dispersion (RD, the standard deviation of residence times divided by the mean) is 1 according to this model, but RDs in real tissues are closer to 2, suggesting that a multiple-compartment model might be more accurate. The residence time of a gas is proportional to its solubility in the tissue. Although the noble gases in particular are 10 times more soluble in lipid than in nonlipid tissues, models of gas exchange generally do not incorporate measurements of the lipid in tissue, which may lead to error in the predicted gas residence times. Could a multiple-compartment model that accounts for the lipid in tissue more accurately predict the mean and RD of gas residence times? In this study, we determined the mean and RD of Xe residence times in intact and surgically isolated muscles in a canine model. We then determined the lipid content and the perfusion heterogeneity in each tissue, and we used these measurements with a multiple-compartment model of gas exchange to predict the longest physiologically plausible Xe residence times. Even so, we found the observed Xe mean residence times to be twice as long as those predicted by the model. However, the predicted RDs were considerably larger than the observed RDs. We conclude that lipid alone cannot account for the residence times of Xe in tissue and that a multiple-compartment model is not an accurate representation of inert gas exchange in tissue. A more accurate model will need to account for other features in the tissue, such as diffusion of gas between vessels and structures with heterogeneous solubility. C1 USN,MED RES INST,BETHESDA,MD 20889. NR 17 TC 2 Z9 2 U1 0 U2 0 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 MAY PY 1993 VL 74 IS 5 BP 2127 EP 2134 PG 8 WC Physiology; Sport Sciences SC Physiology; Sport Sciences GA LD699 UT WOS:A1993LD69900012 PM 8335539 ER PT J AU SLOWEY, MJ SCOCCIA, B AF SLOWEY, MJ SCOCCIA, B TI SIMULTANEOUS BILATERAL ECTOPIC PREGNANCY RESULTING FROM GAMETE INTRAFALLOPIAN TRANSFER (GIFT) SO JOURNAL OF ASSISTED REPRODUCTION AND GENETICS LA English DT Note DE GAMETE INTRAFALLOPIAN TRANSFER (GIFT); ASSISTED REPRODUCTION COMPLICATIONS; BILATERAL ECTOPIC PREGNANCY; ECTOPIC PREGNANCY C1 USN HOSP,DEPT OBSTET & GYNECOL,DIV REPROD ENDOCRINOL & INFERTIL,PORTSMOUTH,VA. NR 0 TC 4 Z9 4 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 1058-0468 J9 J ASSIST REPROD GEN JI J. Assist. Reprod. Genet. PD MAY PY 1993 VL 10 IS 4 BP 304 EP 308 DI 10.1007/BF01204947 PG 5 WC Genetics & Heredity; Obstetrics & Gynecology; Reproductive Biology SC Genetics & Heredity; Obstetrics & Gynecology; Reproductive Biology GA MM525 UT WOS:A1993MM52500014 PM 8130438 ER PT J AU ALM, RA GUERRY, P TRUST, TJ AF ALM, RA GUERRY, P TRUST, TJ TI DISTRIBUTION AND POLYMORPHISM OF THE FLAGELLIN GENES FROM ISOLATES OF CAMPYLOBACTER-COLI AND CAMPYLOBACTER-JEJUNI SO JOURNAL OF BACTERIOLOGY LA English DT Article ID ESCHERICHIA-COLI; SALMONELLA-TYPHIMURIUM; METHANOCOCCUS-VOLTAE; POPULATION-STRUCTURE; MULTIGENE FAMILY; TERMINAL REGIONS; FILAMENT; STRAINS; SEQUENCE; IDENTIFICATION AB The complex flagellar filaments of the LIO8 serogroup member Campylobacter coli VC167 are composed of two highly related subunit proteins encoded by the flaA and flaB genes which share 92% identity. Using oligonucleotide primers based on the known DNA sequence of both the flaA and flaB genes from C. coli VC167 in the polymerase chain reaction, we have shown conservation of both fla genes among isolates within the LIO8 heat-labile serogroup by digestion of the amplified product with PstI and EcoRI restriction endonucleases. Amplification and subsequent restriction analysis of the flaA flagellin gene from Campylobacter isolates belonging to 13 different LIO serogroups further identified 10 unique polymorphic groups. Within most of the serogroups examined, isolates appeared to contain flaA genes with conserved primary structures. Only in serogroups LIO11 and LIO29 did independent isolates possess flagellin genes with different primary structures. Furthermore, by employing primers specific for the flaB gene of C. coli VC167, all serogroups examined contained a second fla gene corresponding to flaB. In all serogroups except the LIO5 and LIO6 isolates which were identical to each other, the polymorphic pattern of this flaB gene was identical to that of the corresponding flaA gene. These data indicate that the presence of a second highly homologous flagellin gene is widespread throughout Campylobacter isolates and that in most instances, the primary structure of the two fla genes is conserved within isolates belonging to the same heat-labile LIO serogroup. This may represent the presence of clonal evolutionary groups in Campylobacter spp. C1 UNIV VICTORIA,DEPT BIOCHEM & MICROBIOL,VICTORIA V8W 3P6,BC,CANADA. USN,MED RES INST,ENTER DIS PROGRAM,BETHESDA,MD 20814. NR 53 TC 67 Z9 70 U1 0 U2 2 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0021-9193 J9 J BACTERIOL JI J. Bacteriol. PD MAY PY 1993 VL 175 IS 10 BP 3051 EP 3057 PG 7 WC Microbiology SC Microbiology GA LB792 UT WOS:A1993LB79200033 PM 8098328 ER PT J AU NGAI, KL AF NGAI, KL TI COMPARISONS BETWEEN COUPLING MODEL AND MOLECULAR-DYNAMICS SIMULATION FOR LOCAL CHAIN MOTIONS IN BULK AMORPHOUS POLYMERS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID TEMPERATURE DEPENDENCES; DIELECTRIC-RELAXATION; SEGMENTAL RELAXATION; CORRELATED SYSTEMS; GLASS-TRANSITION; SELF-DIFFUSION; MELTS AB Recent molecular dynamics simulation of the local chain dynamics of bulk amorphous polymers by Takeuchi and Roe [J. Chem. Phys. 94, 7446 (1991)] have brought out many interesting features of various time-correlation functions of bond reorientational motion. It is pointed out here that these features are in good agreement with what is predicted by the coupling model for local chain motions of amorphous polymers, and furthermore these features are common to relaxations in a number of interacting many body systems. RP NGAI, KL (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 38 TC 38 Z9 38 U1 1 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 MAY 1 PY 1993 VL 98 IS 9 BP 7588 EP 7592 DI 10.1063/1.464699 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LA763 UT WOS:A1993LA76300107 ER PT J AU WU, SJ PAZZAGLIA, G HABERBERGER, RL OPRANDY, JJ SIECKMANN, DG WATTS, DM HAYES, C AF WU, SJ PAZZAGLIA, G HABERBERGER, RL OPRANDY, JJ SIECKMANN, DG WATTS, DM HAYES, C TI DETECTION OF IMMUNOGLOBULIN-A IN URINE SPECIMENS FROM CHILDREN WITH CAMPYLOBACTER-ASSOCIATED DIARRHEA BY A CHEMILUMINESCENT INDICATOR-BASED WESTERN IMMUNOBLOT ASSAY SO JOURNAL OF CLINICAL MICROBIOLOGY LA English DT Article ID OUTER-MEMBRANE PROTEINS; BLOT ANALYSIS; JEJUNI; IDENTIFICATION; ANTIGENS; ENTERITIS; INFECTION AB A Western blot (immunoblot) assay was used to detect Campylobacter-specific immunoglobulin A in urine. Acute-phase urine samples from six children with Campylobacter diarrhea had titers ranging from 2 to 8. The highest titer was detected 4 days postonset. Campylobacter-specific immunoglobulin A was undetectable in the paired convalescent-phase specimens and urine samples from three control children. C1 USN,MED RES UNIT 2,JAKARTA 10110,INDONESIA. USN,MED RES INST,ENTER DIS PROGRAM,BETHESDA,MD 20889. RP WU, SJ (reprint author), USN,MED RES INST,INFECT DIS THREAT ASSESSMENT PROGRAM,BETHESDA,MD 20889, USA. NR 9 TC 2 Z9 2 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0095-1137 J9 J CLIN MICROBIOL JI J. Clin. Microbiol. PD MAY PY 1993 VL 31 IS 5 BP 1394 EP 1396 PG 3 WC Microbiology SC Microbiology GA KY463 UT WOS:A1993KY46300077 PM 8501252 ER PT J AU JONKER, BT FU, LP YU, WY CHOU, WC PETROU, A WARNOCK, J AF JONKER, BT FU, LP YU, WY CHOU, WC PETROU, A WARNOCK, J TI LONG HOLE SPIN RELAXATION-TIMES IN DILUTED MAGNETIC SEMICONDUCTOR HETEROSTRUCTURES SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE EXCITON; HEAVY HOLES; PHOTOLUMINESCENCE; QUANTUM WELL; SPIN LIFETIMES; STRAIN ID INDUCED TYPE-I->TYPE-II TRANSITION; QUANTUM-WELLS; SUPERLATTICE; POLARIZATION; CD1-XMNXTE AB We report the observation of long spin lifetimes for heavy holes in (Zn,Mn)Se and (Zn,Fe)Se based heterostructures. These long spin relaxation times are observed in both simple strained epilayers, as well as in complex spin superlattice structures in which the spin up and spin down carriers occupy alternating layers of the superlattice. In photoluminescence spectra, both the higher energy (+1/2, +3/2) and lower energy (-1/2, -3/2) heavy hole exciton interband transitions are observed, even though it would be energetically favorable for the spin up carriers to first relax to the spin down state before radiative recombination. From the magnetic field dependence of the intensity ratio of these components and a rate equation model, we find that the heavy hole spin lifetime tau(hs) is substantially longer than the electron spin lifetime tau(es), with tau(ha)/tau(r) almost-equal-to 4 and tau(es)/tau(r) almost-equal-to 0.06, where tau(r) is the radiative recombination time. This is attributed to the strain induced splitting of the heavy and light hole bands, which inhibits mixing of the hole spin states and subsequent dipole-allowed transitions producing fast spin relaxation. C1 SUNY Buffalo, BUFFALO, NY 14260 USA. IBM CORP, THOMAS J WATSON RES CTR, YORKTOWN HTS, NY 10598 USA. RP JONKER, BT (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 23 TC 5 Z9 5 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD MAY PY 1993 VL 22 IS 5 BP 489 EP 495 DI 10.1007/BF02661619 PG 7 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA LB025 UT WOS:A1993LB02500013 ER PT J AU VELLANKI, J NADELLA, RK RAO, MV DIETRICH, HB SIMONS, DS CHI, PH AF VELLANKI, J NADELLA, RK RAO, MV DIETRICH, HB SIMONS, DS CHI, PH TI MEV ENERGY SULFUR IMPLANTATION IN GAAS AND INP SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE ANNEALING; GAAS; INP; ION IMPLANTATION ID COMPOUND SEMICONDUCTORS; ION-IMPLANTATION; SI IMPLANTATION; TEMPERATURE; FE AB Room temperature and elevated temperature sulfur implants were performed into semi-insulating GaAs and InP at variable energies and fluences. The implantations were performed in the energy range 1-16 MeV. Range statistics of sulfur in InP and GaAs were calculated from the secondary ion mass spectrometry atomic concentration depth profiles and were compared with TRIM92 values. Slight in-diffusion of sulfur was observed in both InP and GaAs at higher annealing temperatures for room temperature implants. Little or no redistribution of sulfur was observed for elevated temperature implants. Elevated temperature implants showed higher activations and higher mobilities compared to room temperature implants in both GaAs and InP after annealing. Higher peak electron concentrations were observed in sulfur-implanted InP (n almost-equal-to 1 x 10(19) cm-3) compared to GaAs (n almost-equal-to 2 x 10(18) cm-3). The doping profile for a buried n+ layer (n almost-equal-to 3.5 x 10(18) cm-3) of a positive-intrinsic-negative diode in GaAs was produced by using Si/S coimplantation. C1 USN,RES LAB,WASHINGTON,DC 20375. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP VELLANKI, J (reprint author), GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030, USA. NR 25 TC 6 Z9 6 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 MAY PY 1993 VL 22 IS 5 BP 559 EP 560 DI 10.1007/BF02661631 PG 2 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA LB025 UT WOS:A1993LB02500025 ER PT J AU NEEDLEMAN, SB AF NEEDLEMAN, SB TI A DISCUSSION OF CREATININE ANALYSIS IN SINGLE COLLECTION URINE SPECIMENS - REPLY SO JOURNAL OF FORENSIC SCIENCES LA English DT Letter RP NEEDLEMAN, SB (reprint author), USN,DRUG SCREENING LAB,BLDG 38H,GREAT LAKES,IL 60088, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC TESTING MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DR, W CONSHOHOCKEN, PA 19428-2959 SN 0022-1198 J9 J FORENSIC SCI JI J. Forensic Sci. PD MAY PY 1993 VL 38 IS 3 BP 501 EP 502 PG 2 WC Medicine, Legal SC Legal Medicine GA LD283 UT WOS:A1993LD28300002 ER PT J AU NEEDLEMAN, SB AF NEEDLEMAN, SB TI A DISCUSSION OF CREATININE ANALYSIS IN SINGLE COLLECTION URINE SPECIMENS - REPLY SO JOURNAL OF FORENSIC SCIENCES LA English DT Letter RP NEEDLEMAN, SB (reprint author), USN,DRUG SCREENING LAB,GREAT LAKES,IL 60088, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC TESTING MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DR, W CONSHOHOCKEN, PA 19428-2959 SN 0022-1198 J9 J FORENSIC SCI JI J. Forensic Sci. PD MAY PY 1993 VL 38 IS 3 BP 504 EP 505 PG 2 WC Medicine, Legal SC Legal Medicine GA LD283 UT WOS:A1993LD28300004 ER PT J AU MORGAN, HD SEYOUM, HM FORTNA, JDE HUMM, DC ASFAW, A CLEARY, DD AF MORGAN, HD SEYOUM, HM FORTNA, JDE HUMM, DC ASFAW, A CLEARY, DD TI TOTAL PHOTOABSORPTION CROSS-SECTION OF MOLECULAR NITROGEN NEAR 83.4 NM SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID HIGH-RESOLUTION; VACUUM UV; ABSORPTION; SPECTRUM; STATES; N2 AB The photoabsorption cross section of molecular nitrogen near 83.4 nm has been measured at room temperature. The cross sections at the wavelengths of the 2s2p4 P-4(5/2), P-4(3/2), and P-4(1/2) (all - 2s(2)2p3 4SS(o)3/2) O+ emission lines are measured to be 10.1 +/- 1.6 Mb, 0.29 +/- 0.02 Mb, and 0.049 +/- 0.008 Mb respectively. These measurements were made with an O+ emission discharge source, and repeated using a synchrotron radiation source. Both measurements were made with the 0.008-nm resolution 6.65-m spectrometer at the SURF II storage ring of the National Institute for Standards and Technology. C1 USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943. HOWARD UNIV,DEPT PHYS & ASTRON,WASHINGTON,DC 20059. NATL INST STAND & TECHNOL,DIV ELECTRON & OPT PHYS,GAITHERSBURG,MD. RP MORGAN, HD (reprint author), UNIV DISTR COLUMBIA,DEPT PHYS,WASHINGTON,DC 20008, USA. RI Humm, David/B-8825-2016; OI Humm, David/0000-0003-1520-261X; Asfaw, Araya/0000-0001-9926-6658 NR 19 TC 7 Z9 7 U1 0 U2 2 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 MAY 1 PY 1993 VL 98 IS A5 BP 7799 EP 7803 DI 10.1029/92JA02894 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LB643 UT WOS:A1993LB64300026 ER PT J AU KAATZ, FH CHOW, GM EDELSTEIN, AS AF KAATZ, FH CHOW, GM EDELSTEIN, AS TI NARROWING SPUTTERED NANOPARTICLE SIZE DISTRIBUTIONS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID ULTRAFINE METAL PARTICLES; GAS-EVAPORATION; MO AB By adjusting the sputtering rate and gas pressure, it is possible to form nanoparticles of different sizes, phases, and materials. We have investigated the spatial distribution of sputtered particle formation using a vertical, linear arrangement of substrates. Collecting the particles soon after they are formed, before they have time to grow and agglomerate, allows one to obtain a narrow size distribution. In the case of molybdenum, a narrow distribution of cubic particles is formed at relatively large distances (8 cm) from the source. These cubic particles collide and self-assemble in the vapor into arrays of larger cubic particles. The particle size histograms are fitted to lognormal distribution functions. How supersaturation occurs is discussed qualitatively as a function of the distance from the substrate, sputtering rate, and the mean free path in the vapor. This method of nanocrystalline particle formation has potential use in magnetic and opto-electronic (quantum dot) applications, where a narrow size distribution is required. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. RP KAATZ, FH (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 20 TC 17 Z9 17 U1 0 U2 5 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD MAY PY 1993 VL 8 IS 5 BP 995 EP 1000 DI 10.1557/JMR.1993.0995 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA KZ502 UT WOS:A1993KZ50200011 ER PT J AU AYERS, JD AF AYERS, JD TI GLASS-FIBERS WITH FINE CONDUCTING CORES SO JOURNAL OF MATERIALS SCIENCE LA English DT Article AB New methods are described for producing glass fibres containing single or multiple metallic filaments along their axes. The new processes are based upon that first described in 1924 by Taylor. His method consisted in melting a small amount of metal within a glass capillary and of then drawing a fibre from the softened glass. Fibres containing single, submicrometre diameter metal or semiconductor filaments are prepared by inserting a composite fibre prepared by Taylor's method in a glass capillary and drawing from this assembly a new fibre in which the diameter of the axial filament is reduced in proportion to the ratio of the diameters of the capillary and the new fibre. This method has produced filaments substantially less than 1 mum diameter. The second new process consists in drawing a fibre from a tube filled with a mixture of metal and glass powders. This method can produce fibres containing hundreds of filaments within any given cross-section. The filaments are of limited length, however, and they have a spectrum of diameters which depend on the powder particle-size distribution and the processing conditions. They typically range from a few micrometres in diameter down to a fraction of a micrometre. RP AYERS, JD (reprint author), USN,RES LAB,PHYS MET BRANCH,WASHINGTON,DC 20375, USA. NR 11 TC 6 Z9 6 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 MAY 1 PY 1993 VL 28 IS 9 BP 2337 EP 2346 DI 10.1007/BF01151663 PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA LB030 UT WOS:A1993LB03000012 ER PT J AU GOINS, B KLIPPER, R SANDERS, J RUDOLPH, AS PHILLIPS, WT AF GOINS, B KLIPPER, R SANDERS, J RUDOLPH, AS PHILLIPS, WT TI USE OF A TC-99M LIPOSOME LABELING PROCEDURE TO MONITOR THE CIRCULATION PROPERTIES OF LIPOSOME-ENCAPSULATED HEMOGLOBIN IN A RAT SHOCK MODEL SO JOURNAL OF NUCLEAR MEDICINE LA English DT Meeting Abstract C1 UNIV TEXAS,HLTH SCI CTR,SAN ANTONIO,TX 78284. USN,RES LAB,WASHINGTON,DC 20375. RI Phillips, William/E-8427-2010 OI Phillips, William/0000-0001-8248-7817 NR 0 TC 0 Z9 0 U1 0 U2 0 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 20190-5316 SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD MAY PY 1993 VL 34 IS 5 SU S BP P135 EP P136 PG 2 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA LB138 UT WOS:A1993LB13800542 ER PT J AU CHARPENTIER, P OSTFELD, AM HADJIMICHAEL, OC HESTER, R AF CHARPENTIER, P OSTFELD, AM HADJIMICHAEL, OC HESTER, R TI THE MORTALITY OF UNITED-STATES NUCLEAR SUBMARINERS, 1969-1982 SO JOURNAL OF OCCUPATIONAL AND ENVIRONMENTAL MEDICINE LA English DT Article ID HEALTHY WORKER; OCCUPATIONAL COHORT; RATES; MODELS; CANCER; DEATH AB A mortality study of 76,160 men who served on US nuclear submarines is reported. Indirect standardization was used to compare mortality rates to those of the US male population. Multiplicative models were developed to explore patterns of mortality within the cohort. Mortality rates for leukemia, acute myocardial infarction, and for motor vehicle accidents were equivalent to those of US males; rates for other causes were lower, generally consistent with the ''healthy worker effect.'' Motor vehicle accident mortality dropped during the study period, perhaps reflecting efforts to control the problem. Suicide rates were depressed during the period of active duty. There was a suggestion that cancer mortality was associated with submarine type; however, the age distribution casts doubt that the excess was occupationally induced. C1 YALE UNIV,SCH MED,DEPT EPIDEMIOL & PUBL HLTH,60 COLL ST,NEW HAVEN,CT 06510. USN,CTR SUBMARINE MED,GROTON,CT 06340. NR 28 TC 13 Z9 13 U1 0 U2 1 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 1076-2752 J9 J OCCUP ENVIRON MED JI J. Occup. Environ. Med. PD MAY PY 1993 VL 35 IS 5 BP 501 EP 509 PG 9 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA LC733 UT WOS:A1993LC73300008 PM 8515322 ER PT J AU SCHMITZ, WJ THOMPSON, JD AF SCHMITZ, WJ THOMPSON, JD TI ON THE EFFECTS OF HORIZONTAL RESOLUTION IN A LIMITED-AREA MODEL OF THE GULF-STREAM SYSTEM SO JOURNAL OF PHYSICAL OCEANOGRAPHY LA English DT Note ID MESOSCALE VARIABILITY; BOUNDARY CURRENTS; SEPARATION; SCALE AB An adiabatic, primitive equation, eddy-resolving circulation model has been applied to the Gulf Stream System from Cape Hatteras to east of the Grand Banks (30-degrees-48-degrees-N, 78-degrees-45-degrees-W). A two-layer version of the model was driven both by direct wind forcing and by transport prescribed at inflow ports south of Cape Hatteras for the Gulf Stream and near the Grand Banks of Newfoundland for the deep western boundary current. The mean upper-layer thickness was sufficiently large for interface outcropping not to occur. Numerical experiments previously run at 0.2-degrees horizontal resolution (approximately 20 km) had some realistic features, but a key unresolved deficiency was that the highest eddy kinetic energies obtained near the Gulf Stream were too low relative to data by a factor of about 2, with inadequate eastward penetration. A unique set of new numerical experiments has extended previous results to higher horizontal resolution, all other conditions being held fixed. At 0.1-degrees horizontal resolution, eddy kinetic energies in the vicinity of the Gulf Stream realistically increase by a factor of roughly 2 relative to 0.2-degrees. The increase in eddy activity is a result of enhanced energy conversion from mean flow to fluctuations due to barotropic and baroclinic instabilities, with the nature of the instability mixture as well as eddy energy changing with increased resolution. One experiment at 0.05-degrees horizontal resolution (approximately 5 km) yielded kinetic energies and key energy transfer terms that are within 10% of the equivalent 0.1-degrees case, suggesting that convergence of the numerical solutions has nearly been reached. C1 USN,RES LAB,STENNIS SPACE CTR,DIV OCEAN SENSING & PREDICT,BAY ST LOUIS,MO. RP SCHMITZ, WJ (reprint author), WOODS HOLE OCEANOG INST,WOODS HOLE,MA 02543, USA. NR 22 TC 16 Z9 16 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0022-3670 J9 J PHYS OCEANOGR JI J. Phys. Oceanogr. PD MAY PY 1993 VL 23 IS 5 BP 1001 EP 1007 DI 10.1175/1520-0485(1993)023<1001:OTEOHR>2.0.CO;2 PG 7 WC Oceanography SC Oceanography GA LB822 UT WOS:A1993LB82200014 ER PT J AU MCGOWAN, PC FONTANELLA, JJ WINTERSGILL, MC LOMAX, JF HAYDEN, LM AF MCGOWAN, PC FONTANELLA, JJ WINTERSGILL, MC LOMAX, JF HAYDEN, LM TI ELECTRICAL RELAXATION OF DIMERS IN RARE-EARTH-DOPED CALCIUM-FLUORIDE SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE ELECTRICAL RELAXATION; DIMERS; CALCIUM FLUORIDE; DIELECTRIC PROPERTIES; RARE EARTHS; POINT DEFECTS ID DIELECTRIC-RELAXATION; DEFECT; CLUSTERS; CAF2 AB Audio frequency complex impedance measurements have been carried out over the temperature range 310-510 K on samples of calcium fluoride containing 0.1 mol% of either lanthanum or cerium. Consequently, the R(IV) relaxation has been studied. The activation energies are found to be 1.049 and 1.089 eV for cerium and lanthanum, respectively. This relaxation is due to reorientation of a rare earth dimer. The structure of the defect site is discussed. C1 USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. UNIV MARYLAND,DEPT PHYS,CATONSVILLE,MD 21228. RP MCGOWAN, PC (reprint author), USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402, USA. NR 16 TC 2 Z9 2 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD MAY PY 1993 VL 54 IS 5 BP 513 EP 516 DI 10.1016/0022-3697(93)90228-J PG 4 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA LC796 UT WOS:A1993LC79600001 ER PT J AU HOBSON, GV SHREEVE, RP AF HOBSON, GV SHREEVE, RP TI INLET TURBULENCE DISTORTION AND VISCOUS-FLOW DEVELOPMENT IN A CONTROLLED-DIFFUSION COMPRESSOR CASCADE AT VERY HIGH-INCIDENCE SO JOURNAL OF PROPULSION AND POWER LA English DT Article AB Detailed two-component laser Doppler velocimeter (LDV) measurements of the flow through a controlled-diffusion (CD) compressor cascade at a Reynolds number of about 700,000 and at a low Mach number are reported in this article. A very high-incidence angle (8 deg above design) was considered throughout this investigation, which included the full experimental characterization of the turbulence field. The LDV measurements were fully automated and were all taken in coincidence mode, thus turbulent flow correlations could be determined. Most significant was the measurement of the distortion of the inlet freestream turbulence upstream of the blade leading edges. Such information is important in assessing viscous codes which incorporate transport equations to describe the turbulence within the flowfield. The laminar leading-edge separation bubble, which reattached turbulent, was enlarged on the suction surface of the blade. Consistent with measurements at lower incidence angles, the suction surface boundary layer remained attached over the rear part of the blade. The pressure side boundary layer initially showed little or no growth, however, it finally developed into a profile similar to a wall jet. The wake profiles showed significant asymmetry due to the high loading on the blades at the increased incidence angle. RP HOBSON, GV (reprint author), USN,POSTGRAD SCH,TURBOPROPULS LAB,MONTEREY,CA 93940, USA. NR 15 TC 9 Z9 10 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0748-4658 J9 J PROPUL POWER JI J. Propul. Power PD MAY-JUN PY 1993 VL 9 IS 3 BP 397 EP 404 DI 10.2514/3.23635 PG 8 WC Engineering, Aerospace SC Engineering GA LC581 UT WOS:A1993LC58100010 ER PT J AU TOTH, RW AF TOTH, RW TI AN INSTRUMENT FOR PLACING DEPTH CUTS IN A FULL-CONTOUR WAX-UP SO JOURNAL OF PROSTHETIC DENTISTRY LA English DT Article RP TOTH, RW (reprint author), USN,CTR DENT,AREA DENT LAB,NORFOLK,VA 23611, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0022-3913 J9 J PROSTHET DENT JI J. Prosthet. Dent. PD MAY PY 1993 VL 69 IS 5 BP 538 EP 539 DI 10.1016/0022-3913(93)90169-O PG 2 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA LA032 UT WOS:A1993LA03200019 PM 8483137 ER PT J AU TOTH, RW FIEBIGER, GE AF TOTH, RW FIEBIGER, GE TI A THREADED BALL FOR THE SURVEY OF MOUNTED CASTS SO JOURNAL OF PROSTHETIC DENTISTRY LA English DT Article C1 COLL GEORGIA,SCH DENT,AUGUSTA,GA. RP TOTH, RW (reprint author), USN,CTR DENT,NORFOLK,VA 23511, USA. NR 1 TC 1 Z9 1 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0022-3913 J9 J PROSTHET DENT JI J. Prosthet. Dent. PD MAY PY 1993 VL 69 IS 5 BP 542 EP 543 DI 10.1016/0022-3913(93)90173-L PG 2 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA LA032 UT WOS:A1993LA03200023 PM 8483141 ER PT J AU DERSHOWITZ, N LEE, YJ AF DERSHOWITZ, N LEE, YJ TI LOGICAL DEBUGGING SO JOURNAL OF SYMBOLIC COMPUTATION LA English DT Article ID PROGRAMS C1 USN, POSTGRAD SCH, DEPT COMP SCI, MONTEREY, CA 93940 USA. RP DERSHOWITZ, N (reprint author), UNIV ILLINOIS, DEPT COMP SCI, URBANA, IL 61801 USA. NR 51 TC 1 Z9 1 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0747-7171 J9 J SYMB COMPUT JI J. Symb. Comput. PD MAY-JUN PY 1993 VL 15 IS 5-6 BP 745 EP 773 DI 10.1016/S0747-7171(06)80011-8 PG 29 WC Computer Science, Theory & Methods; Mathematics, Applied SC Computer Science; Mathematics GA LQ779 UT WOS:A1993LQ77900011 ER PT J AU RADLINSKI, RP SIMON, MM AF RADLINSKI, RP SIMON, MM TI ACOUSTIC AND ELASTIC WAVE SCATTERING FROM ELLIPTIC-CYLINDRICAL SHELLS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB An acoustic scattering formulation has been derived from a modification of the extended boundary integral method (null-field approach) developed for elastic wave scattering from infinite cylindrical shells of arbitrary shape. Thin shell theory is assumed to describe the motion of the scatterer. Acoustic and elastic p-p wave scattering calculations are presented for elliptic-cylindrical shells of different materials and eccentricities. At low frequencies, the scattering by an elliptical shell in a fluid is dominated by the bending resonances. At higher frequencies, the acoustic scattering is strongly dependent on the angle of incidence, material characteristics, and the predominately extensional structural resonances. In an elastic material, resonant modal responses of the shell were found to increase mode conversion of dilatational waves into shear waves. By comparison with elasticity theory for shells and by extrapolations from thin and thick plate theories, the limitations of the thin shell theory are shown to be material dependent. The present method is used to re-examine examples of backscatter from elliptic-cylindrical shells reported in other studies. C1 ALLIANT TECHSYST INC,EVERETT,WA 98204. RP RADLINSKI, RP (reprint author), USN,UNDERSEA WARFARE CTR DETACHMENT,NEW LONDON,CT 06320, USA. NR 29 TC 7 Z9 7 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAY PY 1993 VL 93 IS 5 BP 2443 EP 2453 DI 10.1121/1.405865 PG 11 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LC572 UT WOS:A1993LC57200001 ER PT J AU GAITAN, DF ATCHLEY, AA AF GAITAN, DF ATCHLEY, AA TI FINITE-AMPLITUDE STANDING WAVES IN HARMONIC AND ANHARMONIC TUBES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB Finite amplitude standing waves have been studied in closed tubes filled with air and driven by a piston at frequencies near 200 Hz. The tubes were driven at resonance generating standing waves with amplitudes of up to 160 dB re: 20 muPa. The main objective was to measure the dissipation of energy by the fundamental frequency and the higher harmonics, as well as by other nonacoustic mechanisms. A formulation developed by Coppens and Sanders [J. Acoust. Soc. Am. 58, 1133-1140 (1975)] using a single nonlinear equation to describe standing waves in cavities of arbitrary resonance frequencies and quality factors was used successfully to predict the higher harmonics. In addition, the effect of detuning the tubes on the energy dissipation was measured in tubes with variable cross sections. It was found that the detuned tubes effectively suppress the energy transfer into (and energy dissipation by) the higher harmonics. It was also found that expanding rather than contracting the cross section of the tubes minimized the dissipation of energy through nonacoustic mechanisms. RP GAITAN, DF (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. RI GAITAN, DARIO/N-2727-2016 OI GAITAN, DARIO/0000-0002-2139-8535 NR 5 TC 31 Z9 32 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAY PY 1993 VL 93 IS 5 BP 2489 EP 2495 DI 10.1121/1.405870 PG 7 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LC572 UT WOS:A1993LC57200006 ER PT J AU HAYWARD, TJ YANG, TC AF HAYWARD, TJ YANG, TC TI LOW-FREQUENCY ARCTIC REVERBERATION .1. MEASUREMENT OF UNDER-ICE BACKSCATTERING STRENGTHS FROM SHORT-RANGE DIRECT-PATH RETURNS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB Under-ice scattering strengths in the backward direction were measured in April 1989 during the CEAREX 89 field experiment in the Norwegian-Greenland Sea using a large-aperture (1200-m) vertical hydrophone array and 1.8-lb SUS explosive sources. Scattering strength estimates for frequencies of 24-105 Hz are presented as a function of scattering angle (2.5-degrees-40-degrees grazing), averaged over incident angles in the range 10-degrees-15-degrees grazing. The corresponding (monostatic) backscattering strength is found to be approximately 10 dB below that reported by Milne [J. Acoust. Soc. Am. 36, 1551-1556 (1964)] for data collected at approximately the same time of year in 1962 near the Canadian Archipelago. The results are compared with scattering functions derived from a Burke-Twersky model [J. Acoust. Soc. Am. 40, 883-895 (1966)], which represents the ice ridges as rigid elliptical half-cylinders. The variations of the measured scattering strength with both scattering angle and frequency are well fitted by this model for scattering angles below 20-degrees grazing. RP HAYWARD, TJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 6 Z9 6 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAY PY 1993 VL 93 IS 5 BP 2517 EP 2523 DI 10.1121/1.405828 PG 7 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LC572 UT WOS:A1993LC57200009 ER PT J AU YANG, TC HAYWARD, TJ AF YANG, TC HAYWARD, TJ TI LOW-FREQUENCY ARCTIC REVERBERATION .2. MODELING OF LONG-RANGE REVERBERATION AND COMPARISON WITH DATA SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SCATTERING AB In the Arctic ocean, very low-frequency (10-50 Hz) reverberation returns from the ice and bottom both contribute to the total received reverberation and are not easily distinguishable in long-range reverberation data, except where there is a dominant bottom or ice feature. In this paper, a normal-mode model of scattering from surface and bottom protuberances is applied to model long-range reverberation data collected during the CEAREX 89 experiment in the Norwegian/Greenland Seas. Modeled reverberation spectrum levels at 23 Hz are compared with data to investigate the relative contributions of the ice and bottom to the measured reverberation. The normal-mode model of boundary scattering is based on a generalization of recent work of Ingenito [F. Ingenito, J. Acoust. Soc. Am. 82, 2051-2059 (1987)] treating scattering from a rigid sphere in a stratified waveguide. Adiabatic normal mode theory is used to model the propagation to and back from the scatterer in a range-dependent waveguide. Using the small-ka approximation for the scattering functions, where k is the wave number and a is the dimension of the boundary protuberance, the normal-mode calculations of the long-range reverberation levels are found to agree rather well with the CEAREX data for four different measurements involving different bottom bathymetries and source depths. For a source at 91-m depth in the 3000-m-deep basin, it is found that the reverberation level for a receiver at 60 m is dominated by scattering from the ice except for reverberation associated with certain identifiable bottom features. For the same environment but a deeper (244-m) source, reverberation levels from the ice and bottom are more comparable. For a strongly range-dependent environment, returns from bottom features are clearly identifiable in the data. RP YANG, TC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 6 Z9 7 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAY PY 1993 VL 93 IS 5 BP 2524 EP 2534 DI 10.1121/1.405829 PG 11 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LC572 UT WOS:A1993LC57200010 ER PT J AU AKAL, T DULLEA, RK GUIDI, G STOCKHAUSEN, JH AF AKAL, T DULLEA, RK GUIDI, G STOCKHAUSEN, JH TI LOW-FREQUENCY VOLUME REVERBERATION MEASUREMENTS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID FISH AB An experimental technique has been developed to measure broadband low-frequency volume reverberation. Experiments were performed in the North Atlantic with broadband explosive sources in conjunction with the end-fire beam of a vertical line array to provide scattering strength contours from measurements sampled in both frequency (approximately 12 Hz) and depth (approximately 4 m). The average effective resolution in frequency (approximately 100 Hz) and depth (approximately 30 m) resulted from signal processing procedures and geometrical effects associated with the measurements. During the measurements a SIMRAD scientific echo sounder system was utilized. This system incorporates split-beam processing technology to provide the most accurate in-situ assessment, analysis, and display of biological target strength. and fish length distributions. The experimental and analysis techniques are described along with representative examples that compare high and low scattering levels observed during the experiment. C1 USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320. DEF RES ESTAB ATLANTIC,DARTMOUTH,NS,CANADA. RP AKAL, T (reprint author), SACLANT,UNDERSEA RES CTR,LA SPEZIA,ITALY. NR 14 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 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAY PY 1993 VL 93 IS 5 BP 2535 EP 2548 DI 10.1121/1.405830 PG 14 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LC572 UT WOS:A1993LC57200011 ER PT J AU FIELD, RL LECLERE, JH AF FIELD, RL LECLERE, JH TI MEASUREMENTS OF BOTTOM-LIMITED OCEAN IMPULSE RESPONSES AND COMPARISONS WITH THE TIME-DOMAIN PARABOLIC EQUATION SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID PROPAGATION AB Ocean impulse response functions computed with the time-domain parabolic equation model are shown to be consistent with response functions measured in a bottom-limited ocean located off the east coast of the United States. The geoacoustics used in the model are developed from Deep Sea Drilling Project sites near the experimental area. Measured impulse responses are obtained by correlating the measured source signature of a 25- to 150-Hz linear, frequency-modulated signal with the signals received on a 15-element vertical line array. Correlation coefficients computed as a function of depth are used as a measure of comparison between measured and modeled responses. The capability of the time-domain parabolic equation to model wide-angle (68-degrees-75-degrees) multipaths and sub-bottom layers with high impedance contrasts is shown. Correlation loss between response functions measured from different transmissions at the same range is shown to be attributable to the degree to which spatial invariance of the ocean can be assumed. RP FIELD, RL (reprint author), USN,RES LAB DETACHMENT,BAY ST LOUIS,MS 39529, USA. NR 11 TC 7 Z9 7 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAY PY 1993 VL 93 IS 5 BP 2599 EP 2616 DI 10.1121/1.405834 PG 18 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LC572 UT WOS:A1993LC57200016 ER PT J AU SMITH, GB CHANDLER, HA FEUILLADE, C AF SMITH, GB CHANDLER, HA FEUILLADE, C TI PERFORMANCE STABILITY OF HIGH-RESOLUTION MATCHED-FIELD PROCESSORS TO SOUND-SPEED MISMATCH IN A SHALLOW-WATER ENVIRONMENT SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SOURCE LOCALIZATION; DEPTH ESTIMATION; WAVE-GUIDES; RANGE; ARRAY AB The effects of variations in water sound-speed parameters on the performance of four matched-field processing algorithms (Bartlett, maximum-likelihood, sector-focusing, and multiple constraint) have been investigated. The SNAP propagation model was used to generate the replica acoustic pressure field for a shallow water channel with a depth variable sound-speed profile typical of a midlatitude summer environment. It was also used to simulate a ''detected'' field due to an acoustic source. These were then correlated using the four algorithms for selected degrees of mismatch of the water sound-speed profile. The maximum likelihood and multiple constraint estimators achieved good peak resolution and high accuracy for small degrees of mismatch. The maximum likelihood estimator deteriorated quickly as the mismatch increased. The multiple constraint estimator performed significantly better, but both failed to give correct location estimates at the higher mismatch values. In contrast, the sector focusing estimator continued to give accurate location estimates over the whole range of sound-speed mismatch, with slightly less peak resolution at small mismatch values. It also performed significantly better overall than the Bartlett estimator, which was found to give accurate location estimates over the whole range of mismatch values used, but with poor peak resolution against a background containing many high sidelobes. RP SMITH, GB (reprint author), USN,RES LAB,BAY ST LOUIS,MS 39529, USA. NR 21 TC 12 Z9 13 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAY PY 1993 VL 93 IS 5 BP 2617 EP 2626 DI 10.1121/1.405835 PG 10 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LC572 UT WOS:A1993LC57200017 ER PT J AU STANIC, S KENNEDY, E RAY, RI AF STANIC, S KENNEDY, E RAY, RI TI HIGH-FREQUENCY BISTATIC REVERBERATION FROM A SMOOTH OCEAN BOTTOM SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SHALLOW-WATER; ACOUSTIC BACKSCATTERING; SCATTERING AB High-frequency bistatic reverberation was measured from a smooth, sandy, featureless bottom located 19 miles south of Panama City, FL. Bistatic scattering variability is presented as a function of frequency (20-180 kHz), grazing angles (9.5-degrees-30-degrees), and small horizontal and vertical bistatic scattering angles. Results show that bistatic variabilities tend to decrease with decreasing grazing angles and decreasing source beamwidths. Possible explanations for these decreasing variations are also presented. RP STANIC, S (reprint author), USN,OCEAN & ATMOSPHER RES LAB,DIV OCEAN ACOUST,BAY ST LOUIS,MS 39529, USA. NR 15 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 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAY PY 1993 VL 93 IS 5 BP 2633 EP 2638 DI 10.1121/1.405837 PG 6 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LC572 UT WOS:A1993LC57200019 ER PT J AU KARANGELEN, CC DIACHOK, O AF KARANGELEN, CC DIACHOK, O TI EXPERIMENTAL DEMONSTRATION OF SOUND-SPEED INVERSION WITH MATCHED-FIELD PROCESSING SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ACOUSTIC TOMOGRAPHY; OCEAN AB Matched-field processing is shown to be effective for estimating sound speed in a deep, range-independent ocean environment. The amplitude and phase of signals from a distant source measured on a large aperture vertical array are sensitive to changes in sound speed. This sensitivity is exploited to infer the environment's sound-speed profile by matching predicted and measured amplitude and phase. Simulations and an initial experimental demonstration of the power of the technique are based on a modified version of Munk's canonical sound field model. This model is used in a simulated environment with a 15-Hz source where source and receiver locations are known. The simulation demonstrates that changes in the depth and strength of the modeled sound channel axis directly result in trackable errors in range and depth as well as in reduction of the received power level. The same model is used to determine sound-speed profile using a 15-Hz signal from a 244-m explosive source detected on a 675-m vertical array at a range of 53 km in a deep water Pacific environment, characterized by a classical range-independent sound channel at 700 m. The search for the best estimated profile is conducted by varying the sound channel axis strength and depth in the modified Munk equation, while maintaining a constant sound-speed profile at great depths. For the single test case, resultant differences between the matched-field estimated and measured profiles are less than +/- 2 m/s; the sound channel axis depth is determined within 20 m of the measured axis depth. C1 USN,RES LAB,DIV ACOUST,WASHINGTON,DC 20375. RP KARANGELEN, CC (reprint author), CATHOLIC UNIV AMER,DEPT MECH ENGN,WASHINGTON,DC 20264, USA. NR 11 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAY PY 1993 VL 93 IS 5 BP 2649 EP 2655 DI 10.1121/1.405839 PG 7 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LC572 UT WOS:A1993LC57200021 ER PT J AU GINGRAS, DF GERR, NL AF GINGRAS, DF GERR, NL TI MINIMAX ROBUST MATCHED-FIELD PROCESSING SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SHALLOW-WATER; SOURCE LOCALIZATION; VERTICAL ARRAY; SOUND-SPEED; MISMATCH; SENSITIVITY; ENVIRONMENT AB The incorporation of propagation modeling into array signal processing, usually referred to as ''matched-field processing,'' has received considerable attention. The issue of the sensitivity of the performance of these methods to uncertainty about the environmental knowledge remains an open issue. In this paper broadband processing methods that are tolerant of the uncertainty about environmental knowledge are investigated. A robust matched-field processor based on minimax robust filtering methods is developed. The performance of the robust processor, in the presence of uncertain environmental knowledge, is compared to conventional methods in the context of a shallow water example. In the cases examined the robust method provided significant performance improvements over conventional methods. C1 OFF NAVAL RES,ARLINGTON,VA 22217. RP GINGRAS, DF (reprint author), SACLANT UNDERSEA RES CTR,LA SPEZIA,ITALY. NR 19 TC 11 Z9 11 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAY PY 1993 VL 93 IS 5 BP 2798 EP 2808 DI 10.1121/1.405801 PG 11 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LC572 UT WOS:A1993LC57200037 ER PT J AU PAUL, BF AF PAUL, BF TI CORRECTING GENERALIZED GINGIVAL RECESSION SO JOURNAL OF THE AMERICAN DENTAL ASSOCIATION LA English DT Article ID CITRIC-ACID; GRAFT AB Recession associated with the maxillary anterior gingiva can be particularly displeasing to the patient with a high smile line. The coronally positioned flap technique was used in this case to create a more esthetic appearance. C1 USN,DENT CORPS,WASHINGTON,DC 20350. ELEVENTH DENT CO DETACHMENT,DEPT PERIODONT,MARINE CORPS AIR STN,IWAKUNI,JAPAN. NR 12 TC 0 Z9 0 U1 0 U2 0 PU AMER DENTAL ASSN PI CHICAGO PA 211 E CHICAGO AVE, CHICAGO, IL 60611 SN 0002-8177 J9 J AM DENT ASSOC JI J. Am. Dent. Assoc. PD MAY PY 1993 VL 124 IS 5 BP 84 EP & PG 0 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA LC875 UT WOS:A1993LC87500017 PM 8280203 ER PT J AU GILLEN, G HUES, SM AF GILLEN, G HUES, SM TI DOPED GELATIN FILMS AS A MODEL MATRIX FOR MOLECULAR SECONDARY ION MASS-SPECTROMETRY STUDIES OF BIOLOGICAL SOFT-TISSUE SO JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY LA English DT Article AB Porcine gelatin films doped with a number of biological compounds at various concentrations and prepared by spin-casting have been used as model biological tissue matrices for studying organic ion emission in molecular secondary ion mass spectrometry. For many compounds, portions of the working curves were found to be linear over several orders of magnitude in concentration. Detection limits for the analyzed compounds were in the parts per million range for several organic salt compounds but high (0.1 wt%) for others. Owing to the presence of a significant chemical background, the poorest detection limits were generally obtained from compounds with low molecular weights. Secondary ion yield matrix effects, indicated by a reduction in ionization efficiency at higher concentrations, were observed for several organic salt compounds. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP GILLEN, G (reprint author), NATL INST STAND & TECHNOL,DIV SURFACE & MICROANAL SCI,GAITHERSBURG,MD 20899, USA. NR 12 TC 20 Z9 20 U1 0 U2 1 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 1044-0305 J9 J AM SOC MASS SPECTR JI J. Am. Soc. Mass Spectrom. PD MAY PY 1993 VL 4 IS 5 BP 419 EP 423 DI 10.1016/1044-0305(93)85007-K PG 5 WC Chemistry, Analytical; Chemistry, Physical; Spectroscopy SC Chemistry; Spectroscopy GA KZ714 UT WOS:A1993KZ71400007 PM 24234939 ER PT J AU SCANLON, JF KRUGER, J MORAN, PJ AF SCANLON, JF KRUGER, J MORAN, PJ TI THE ANODIC BEHAVIOR OF IRON IN ANHYDROUS DIMETHOXYETHANE AND PASSIVATION BY SOLVENT ELECTROPOLYMERIZATION SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID PROPYLENE CARBONATE; PASSIVITY; STEEL; POLYMERIZATION; ELECTROLYTE; CORROSION AB The corrosion and passivity of high purity iron in anhydrous dimethoxyethane with 0.5M LiAsF6 have been studied by various electrochemical and surface analytical techniques. The motivations for this study were twofold; (i) to develop an understanding of the passivity of metals and alloys in anhydrous organic solutions at a fundamental level, and (ii) to apply what is learned to improve the performance and useful life of high energy density lithium batteries which employ organic solvents. The data show that iron displays a stable passive region with low current densities over a large range of anodic potentials. Several different passivation mechanisms have been identified in this stable region. Among these mechanisms is passivation by solvent chemisorption. Our key finding is the observation of passivation by electropolymerization of the dimethoxyethane solvent. The polymerization reaction has not been observed when electrolytes other than LiAsF6 are used. Consequently, the potential at which breakdown of passivity occurs is lower in solutions containing alternative electrolytes. In addition, a bare oxide-free metal surface appears necessary for initiation of the electropolymerization reaction. C1 USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402. RP SCANLON, JF (reprint author), JOHNS HOPKINS UNIV,DEPT MAT SCI & ENGN,BALTIMORE,MD 21218, USA. NR 22 TC 9 Z9 9 U1 0 U2 1 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 MAY PY 1993 VL 140 IS 5 BP 1268 EP 1274 DI 10.1149/1.2220969 PG 7 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA LC109 UT WOS:A1993LC10900017 ER PT J AU HAWKINS, BJ BAYS, PN AF HAWKINS, BJ BAYS, PN TI CATASTROPHIC COMPLICATION OF SIMPLE CAST TREATMENT - CASE-REPORT SO JOURNAL OF TRAUMA-INJURY INFECTION AND CRITICAL CARE LA English DT Article AB We report the case of a 36-year-old man who developed a compartment syndrome after a minor ankle fracture was casted. The treatment was inadequately monitored and he subsequently developed the manifestations of a crush syndrome. This case demonstrates that relatively minor injuries can indeed be fatal if appropriate vigilance is not maintained. RP HAWKINS, BJ (reprint author), USN,DEPT ORTHOPED HOSP,BOONE RD,BREMERTON,WA 98312, USA. NR 7 TC 20 Z9 20 U1 1 U2 1 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 1079-6061 J9 J TRAUMA JI J. Trauma-Injury Infect. Crit. Care PD MAY PY 1993 VL 34 IS 5 BP 760 EP 762 DI 10.1097/00005373-199305000-00018 PG 3 WC Critical Care Medicine; Surgery SC General & Internal Medicine; Surgery GA LG403 UT WOS:A1993LG40300018 PM 8497010 ER PT J AU DAVIS, JL WAGNER, RJ WATERMAN, JR SHANABROOK, BV OMAGGIO, JP AF DAVIS, JL WAGNER, RJ WATERMAN, JR SHANABROOK, BV OMAGGIO, JP TI OPTIMUM GROWTH TEMPERATURE DETERMINATION FOR GALNSB/INAS STRAINED-LAYER SUPERLATTICES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 12TH NORTH AMERICAN CONF ON MOLECULAR BEAM EPITAXY CY OCT 12-14, 1992 CL OTTAWA, CANADA SP AMER VACUUM SOC ID SUBSTRATE-TEMPERATURE; INFRARED DETECTORS AB To determine the optimum growth temperature for GaInSb/InAs strained layer superlattices (SLS) a series of SLS was grown over the temperature range 357-433-degrees-C. Temperatures were estimated by determining the absorption spectrum of the GaAs substrate, hence its band gap, and thus its temperature. SLS were evaluated by single crystal x-ray diffraction and interband magnetoabsorption (IMA) measurements. X-ray spectra showed as many as eight peaks due to the superlattice. The quality of the superlattices as indicated by the x-ray data had a well defined maximum between 390 and 410-degrees-C. IMA measurements indicated band gaps from 85 to 154 meV. RP DAVIS, JL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 TC 7 Z9 7 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAY-JUN PY 1993 VL 11 IS 3 BP 861 EP 863 DI 10.1116/1.586766 PG 3 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA LH228 UT WOS:A1993LH22800062 ER PT J AU SHANABROOK, BV WATERMAN, JR DAVIS, JL WAGNER, RJ KATZER, DS AF SHANABROOK, BV WATERMAN, JR DAVIS, JL WAGNER, RJ KATZER, DS TI VARIATIONS IN SUBSTRATE-TEMPERATURE INDUCED BY MOLECULAR-BEAM EPITAXIAL-GROWTH ON RADIATIVELY HEATED SUBSTRATES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article AB Large changes in substrate temperature that occur during molecular-beam epitaxial growth of materials with energy gaps smaller than that of the substrate have been observed. These changes in temperature, which are not detected by the conventional thermocouple, have been measured by observing the changes in the infrared transmission spectrum of the radiatively heated substrate. In addition to describing the experimental arrangement used for these measurements, the advantages and disadvantages of using this technique for substrate temperature determination are discussed. RP USN, RES LAB, WASHINGTON, DC 20375 USA. RI Katzer, D. Scott/N-7841-2013 NR 8 TC 27 Z9 27 U1 0 U2 2 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAY-JUN PY 1993 VL 11 IS 3 BP 994 EP 997 DI 10.1116/1.586909 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA LH228 UT WOS:A1993LH22800102 ER PT J AU KATZER, DS SHANABROOK, BV AF KATZER, DS SHANABROOK, BV TI COMPARISON OF OPTICAL PYROMETRY AND INFRARED TRANSMISSION MEASUREMENTS ON INDIUM-FREE MOUNTED SUBSTRATES DURING MOLECULAR-BEAM EPITAXIAL-GROWTH SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article AB Detailed comparisons have been made of temperatures measured by an infrared transmission (IRT) technique and traditional optical pyrometry during the molecular-beam epitaxial growth of GaAs, AlSb, GaSb, and InAs on undoped semi-insulating (SI) GaAs, blackened SI GaAs, and heavily silicon-doped N+ GaAs substrates in indium-free mounts. These comparisons indicate that IRT and optical pyrometry measurements show excellent agreement (+/- 7-degrees-C at most) over the 400-600-degrees-C temperature range, if extreme care is taken to minimize pyrometer errors caused by stray light and coating of the pyrometer window. RP USN, RES LAB, WASHINGTON, DC 20375 USA. RI Katzer, D. Scott/N-7841-2013 NR 7 TC 15 Z9 15 U1 0 U2 2 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAY-JUN PY 1993 VL 11 IS 3 BP 1003 EP 1006 DI 10.1116/1.586856 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA LH228 UT WOS:A1993LH22800104 ER PT J AU THOMPSON, PE TWIGG, ME GODBEY, DJ HOBART, KD SIMONS, DS AF THOMPSON, PE TWIGG, ME GODBEY, DJ HOBART, KD SIMONS, DS TI LOW-TEMPERATURE CLEANING PROCESSES FOR SI MOLECULAR-BEAM EPITAXY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 12TH NORTH AMERICAN CONF ON MOLECULAR BEAM EPITAXY CY OCT 12-14, 1992 CL OTTAWA, CANADA SP AMER VACUUM SOC ID HYDROGEN TERMINATION; SILICON; SURFACE AB Hydrogen-terminated surface cleaning techniques of silicon substrates were investigated by using x-ray photoelectron spectroscopy (XPS), secondary ion mass spectrometry (SIMS), and transmission electron microscopy (TEM). Either a 4% HF dip or an HF-terminated abbreviated Shiraki clean was used as the cleaning technique. Shiraki-cleaned samples were grown as control samples. XPS was used to measure the C, O, and F remaining on the surface at various stages of the cleaning/growth process, including after a 1 h bake at 200-degrees-C prior to growth. XPS did not detect a significant difference in the adsorbate concentrations between the baked and unbaked samples. From SIMS, the lowest impurity concentrations at the epitaxial/substrate interface were achieved with the abbreviated Shiraki clean, approximately at the same levels as obtained with the standard Shiraki clean, 1.3X10(13), 5.4X10(12), 1.6X10(10), and 4.2X10(11)/cM2 for C, O, F, and N, respectively. This was achieved without the 850-degrees-C anneal required to desorb the oxide on the Shiraki-cleaned samples. The epitaxial structure chosen for the TEM study was a 30 nm Si buffer grown at 650-degrees-C followed by a 60 nm Si0.7Ge0.3 quantum well and a 250 nm Si layer, both grown at 500-degrees-C. The structures were observed both as-grown and after a 850-degrees-C, 1/2 h anneal used to study defect propagation. There were no detectable differences in the as-grown structures using plan-view TEM. However when the samples were annealed, the HF-dipped specimen developed inclusions in the top Si layer which were not observed in the other samples. In contrast, the prebaked HF-dip-cleaned sample did not have these defects when annealed. C1 NATL INST STAND & TECHNOL,DIV SURFACE & MICROANAL SCI,GAITHERSBURG,MD 20899. RP THOMPSON, PE (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,CODE 6812,WASHINGTON,DC 20375, USA. NR 16 TC 48 Z9 48 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAY-JUN PY 1993 VL 11 IS 3 BP 1077 EP 1082 DI 10.1116/1.587011 PG 6 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA LH228 UT WOS:A1993LH22800120 ER PT J AU HOBART, KD GODBEY, DJ THOMPSON, PE SIMONS, DS AF HOBART, KD GODBEY, DJ THOMPSON, PE SIMONS, DS TI SB SURFACE SEGREGATION DURING HEAVY DOPING OF SI(100) GROWN AT LOW-TEMPERATURE BY MOLECULAR-BEAM EPITAXY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 12TH NORTH AMERICAN CONF ON MOLECULAR BEAM EPITAXY CY OCT 12-14, 1992 CL OTTAWA, CANADA SP AMER VACUUM SOC ID SILICON; LAYERS AB Sb surface segregation and doping during Si(100) molecular beam epitaxy at low temperature have been studied by depth profiling with secondary ion mass spectrometry, x-ray photoelectron spectroscopy, and conductivity measurements. We find that at a growth temperature near 320-degrees-C complete donor activation and doping densities near 5 X 10(20) CM-3 are obtainable. For temperatures between 320-500-degrees-C, measurements point to the existence of distinct surface segregation regimes. For dilute surface and bulk Sb concentrations the measurements reveal a region where the surface segregation is constant and bulk and surface concentrations are linearly related. For bulk concentrations near the solid solubility limit, the surface segregation increases rapidly with increasing bulk concentration for temperatures between 350-450-degrees-C. Finally, for Sb-saturated surfaces the surface segregation actually decreases, and doping levels exceeding the solid solubility limit are possible. C1 NATL INST STAND & TECHNOL,DIV SURFACE & MICROANAL SCI,GAITHERSBURG,MD 20899. RP HOBART, KD (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,CODE 6812,WASHINGTON,DC 20375, USA. NR 20 TC 10 Z9 10 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAY-JUN PY 1993 VL 11 IS 3 BP 1115 EP 1119 DI 10.1116/1.586823 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA LH228 UT WOS:A1993LH22800127 ER PT J AU GODBEY, DJ ANCONA, MG AF GODBEY, DJ ANCONA, MG TI GE SEGREGATION DURING THE GROWTH OF A SIGE BURIED LAYER BY MOLECULAR-BEAM EPITAXY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 12TH NORTH AMERICAN CONF ON MOLECULAR BEAM EPITAXY CY OCT 12-14, 1992 CL OTTAWA, CANADA SP AMER VACUUM SOC ID SURFACE SEGREGATION; SI1-XGEX ALLOYS; ETCH STOP; PHOTOLUMINESCENCE; SILICON AB The germanium concentration profile of thin Si/SiGe heterostructures grown at 500-degrees-C using elemental source molecular beam epitaxy were measured by x-ray photoelectron spectroscopy. The primary finding from these measurements is that there are significant segregation effects in these commonly grown structures which affect both the ''leading'' and ''trailing'' interfaces. Kinetic simulations derived from the measurements indicate that upon opening of the germanium shutter for the deposition of a Si0.7Ge0.3 layer, the surface monolayer must be built up to a germanium composition of greater than 96% before the composition of the deposited alloy layer is equal to the flux composition. This buildup causes a germanium depletion at the leading interface. Upon termination of the germanium flux, incorporation of the germanium rich monolayer into the growing silicon cap layer causes a corresponding degradation of the trailing interface. RP GODBEY, DJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 18 TC 28 Z9 28 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAY-JUN PY 1993 VL 11 IS 3 BP 1120 EP 1123 DI 10.1116/1.586824 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA LH228 UT WOS:A1993LH22800128 ER PT J AU KENNEDY, TA GLASER, ER GODBEY, DJ THOMPSON, PE CHERN, CH WANG, KL XIAO, X STURM, JC AF KENNEDY, TA GLASER, ER GODBEY, DJ THOMPSON, PE CHERN, CH WANG, KL XIAO, X STURM, JC TI OPTICALLY DETECTED MAGNETIC-RESONANCE OF SHARP LUMINESCENCE FROM SI/SI1-XGEX SUPERLATTICES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article ID SI1-XGEX ALLOYS; QUANTUM-WELLS; PHOTOLUMINESCENCE; SEMICONDUCTORS; EXCITONS AB The sharp emission from three Si/Si1-xGex superlattices has been analyzed experimentally using optically detected magnetic resonance techniques. Two types of response were observed in samples grown by molecular-beam epitaxy and rapid-thermal chemical vapor deposition. First, two samples exhibited spectra due to carrier heating in the underlying Si at the condition of cyclotron resonance. No spin resonance was observed, consistent with the previous assignment of the photoluminescence to an impurity-bound exciton. Second, one sample showed spin resonance from a weakly coupled electron and hole. Hence, the recombination mechanism is different from other samples. Various mechanisms are discussed. C1 UNIV CALIF LOS ANGELES, DEPT EE, LOS ANGELES, CA 90024 USA. PRINCETON UNIV, SCH ENGN & APPL SCI, PRINCETON, NJ 08544 USA. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 19 TC 1 Z9 1 U1 2 U2 3 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAY-JUN PY 1993 VL 11 IS 3 BP 1154 EP 1158 DI 10.1116/1.586831 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA LH228 UT WOS:A1993LH22800135 ER PT J AU WANG, HT AF WANG, HT TI APPROXIMATE SOLUTIONS FOR CABLES UNDER GENERALIZED HYDRODYNAMIC LOADINGS SO JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING-ASCE LA English DT Article AB Approximate closed-form solutions arc given for the configuration of a cable under generalized hydrodynamic loading, in which the weight may take on any value and the drag is composed of arbitrary proportions of friction and pressure components. The basis of the approximation is a set of solutions for a cable with nonzero weight under pure friction drag. It is shown that by using a simple asymptotic matching of these solutions with the exact value of the cable critical angle at large cable lengths, reasonable approximations are obtained for cables under a more general drag loading. The accuracy is further increased by replacing the actual weight-to-drag ratio by an effective ratio, which accounts for the drag loading through the critical angle. The resulting solutions are highly accurate (to better than two places) for cases in which the initial and critical angles lie in the same quadrant, and furnish useful estimates when these angles lie in different quadrants. RP WANG, HT (reprint author), USN,RES LAB,DIV REMOTE SENSING,CODE 7226,WASHINGTON,DC 20375, USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU ASCE-AMER SOC CIVIL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2398 SN 0733-950X J9 J WATERW PORT C-ASCE JI J. Waterw. Port Coast. Ocean Eng.-ASCE PD MAY-JUN PY 1993 VL 119 IS 3 BP 274 EP 288 DI 10.1061/(ASCE)0733-950X(1993)119:3(274) PG 15 WC Engineering, Civil; Engineering, Ocean; Water Resources SC Engineering; Water Resources GA KZ883 UT WOS:A1993KZ88300004 ER PT J AU DEMMEL, JW GRAGG, W AF DEMMEL, JW GRAGG, W TI ON COMPUTING ACCURATE SINGULAR-VALUES AND EIGENVALUES OF MATRICES WITH ACYCLIC GRAPHS SO LINEAR ALGEBRA AND ITS APPLICATIONS LA English DT Article ID EIGENVECTORS; DIVIDE AB It is known that small relative perturbations in the entries of a bidiagonal matrix only cause small relative perturbations in its singular values, independent of the values of the matrix entries. In this paper we show that a matrix has this property if and only if its associated bipartite graph is acyclic. We also show how to compute the singular values of such a matrix to high relative accuracy. The same algorithm can compute eigenvalues of symmetric matrices with acyclic graphs with tiny componentwise relative backward error. This class includes tridiagonal matrices, arrow matrices, and exponentially many others. C1 UNIV CALIF BERKELEY,DEPT MATH,BERKELEY,CA 94720. USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93943. RP DEMMEL, JW (reprint author), UNIV CALIF BERKELEY,DIV COMP SCI,BERKELEY,CA 94720, USA. NR 22 TC 26 Z9 26 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0024-3795 J9 LINEAR ALGEBRA APPL JI Linear Alg. Appl. PD MAY PY 1993 VL 185 BP 203 EP 217 DI 10.1016/0024-3795(93)90213-8 PG 15 WC Mathematics, Applied; Mathematics SC Mathematics GA KY621 UT WOS:A1993KY62100013 ER PT J AU KRAEMER, GP ALBERTE, RS AF KRAEMER, GP ALBERTE, RS TI AGE-RELATED PATTERNS OF METABOLISM AND BIOMASS IN SUBTERRANEAN TISSUES OF ZOSTERA-MARINA (EELGRASS) SO MARINE ECOLOGY PROGRESS SERIES LA English DT Article ID SEASONAL-CHANGES; GROWTH DYNAMICS; SEAGRASS; PHOTOSYNTHESIS; NITROGEN; LIGHT; PLANT; PRODUCTIVITY; RESPIRATION; ADAPTATION AB Production and metabolic features of the rhizomatous marine angiosperm Zostera marina L. (eelgrass) from a subtidal meadow in Monterey Bay, Monterey, California, USA, were examined to assess the impact of the subterranean system on whole plant metabolism. Total subterranean biomass of eelgrass was correlated with above-ground (shoot) biomass. The subterranean system presents a gradient in tissue age, from young (proximal to shoot) to old (distal). While root biomass was constant, indices of metabolic capacity (respiration, soluble carbohydrate content, glutamine synthetase activity) decreased with increasing tissue age. Rhizome internodal biomass and carbohydrate levels were influenced by season and tissue age, and rates of respiration declined with increasing tissue age. The first 4 (youngest) root bundles along the rhizome accounted for >90 % of total plant NH4+ assimilatory potential, while O2 consumption increased linearly with increasing amount of subterranean tissue. A model of whole plant carbon balance predicted compensation depths (photosynthesis = respiration) for Monterey Bay eelgrass of 4.2 to 11.6 m depth, given instantaneous shoot P(net):R ratios of 11 to 4.5. The model also predicted that small changes in both P(net):R and depth (light availability) have the potential to effect large changes in the rate of new tissue production. Although the subterranean tissues constitute 20 to 26 % of plant biomass, carbon consumed by respiration in the subterranean tissue represented <15 % of gross photosynthetic production (P(g)) at depths < 10 m. At the deep edges of the eelgrass bed, the model predicts that total subterranean respiration increases to 25 % of P(g). Since respiration by subterranean tissues represents only 10 to 15 % of total plant respiration, eelgrass carbon balance is strongly controlled by shoot carbon metabolism. C1 UNIV CALIF LOS ANGELES, DEPT BIOL, LOS ANGELES, CA 90024 USA. USN, OFF RES, MOLEC CELL & ENVIRONM BIOL PROGRAM, ARLINGTON, VA 22217 USA. NR 34 TC 44 Z9 44 U1 0 U2 4 PU INTER-RESEARCH PI OLDENDORF LUHE PA NORDBUNTE 23, D-21385 OLDENDORF LUHE, GERMANY SN 0171-8630 J9 MAR ECOL PROG SER JI Mar. Ecol.-Prog. Ser. PD MAY PY 1993 VL 95 IS 1-2 BP 193 EP 203 DI 10.3354/meps095193 PG 11 WC Ecology; Marine & Freshwater Biology; Oceanography SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Oceanography GA LE692 UT WOS:A1993LE69200019 ER PT J AU BLOOD, CG GAUKER, ED AF BLOOD, CG GAUKER, ED TI THE RELATIONSHIP BETWEEN BATTLE INTENSITY AND DISEASE RATES AMONG MARINE CORPS INFANTRY UNITS SO MILITARY MEDICINE LA English DT Article AB Disease and non-battle injury (DNBI) rates were examined in conjunction with casualty rates across two Marine Corps operational scenarios, the assault on Okinawa and the Korean War. DNBI rates increased significantly with battle intensity among Marine infantry battalions involved in both operations. Highly significant positive correlations (p < 0.001) were evidenced between DNBI rate and wounded-in-action (WIA) rate, DNBI rate and killed-in-action rate, and DNBI rate and the preceding week's WIA rate among infantry units in both Okinawa and Korea. The severity of wounds and DNBI rate were also significantly correlated. RP BLOOD, CG (reprint author), USN,HLTH RES CTR,MED INFORMAT SYST & OPERAT RES DEPT,POB 85122,SAN DIEGO,CA 92186, USA. NR 0 TC 18 Z9 18 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD MAY PY 1993 VL 158 IS 5 BP 340 EP 344 PG 5 WC Medicine, General & Internal SC General & Internal Medicine GA LB249 UT WOS:A1993LB24900018 PM 8502400 ER PT J AU APRILL, BS SHAKIR, KMM AF APRILL, BS SHAKIR, KMM TI INSULINOMA AND MEALS READY-TO-EAT SO MILITARY MEDICINE LA English DT Letter RP APRILL, BS (reprint author), USN,NATL NAVAL MED CTR,DEPT INTERNAL MED,DIV ENDOCRINOL METAB,BETHESDA,MD 20889, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD MAY PY 1993 VL 158 IS 5 BP A5 EP A5 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA LB249 UT WOS:A1993LB24900001 PM 8502386 ER PT J AU COGSWELL, JP COGSWELL, PC KUEHL, WM CUDDIHY, AM BENDER, TM ENGELKE, U MARCU, KB TING, JPY AF COGSWELL, JP COGSWELL, PC KUEHL, WM CUDDIHY, AM BENDER, TM ENGELKE, U MARCU, KB TING, JPY TI MECHANISM OF C-MYC REGULATION BY C-MYB IN DIFFERENT CELL LINEAGES SO MOLECULAR AND CELLULAR BIOLOGY LA English DT Article ID SEQUENCE-SPECIFIC INTERACTION; RNA INHIBITS PROLIFERATION; HUMAN LYMPHOCYTES-T; DNA-BINDING; PROTO-ONCOGENE; MESSENGER-RNA; V-MYB; TRANSCRIPTIONAL CONTROL; OLIGOMER COMPLEMENTARY; FUNCTIONAL DOMAINS AB Activation of the murine c-myc promoter by murine c-Myb protein was examined in several cell lines by using a transient expression system in which Myb expression vectors activate the c-myc promoter linked to a chloramphenicol acetyltransferase reporter gene or a genomic beta-globin gene. Sl nuclease protection analyses confirmed that the induction of c-myc by c-Myb was transcriptional and affected both P1 and P2 start sites in a murine T-cell line, EL4, and a myelomonocytic line, WEHI-3. Mutational analyses of the c-myc promoter revealed that two distinct regions could confer Myb responsiveness in two T-cell lines, a distal site upstream of P1 and a proximal site within the first noncoding exon. In contrast, only the proximal site was required for other cell lineages examined. Five separate Myb-binding sites were located in this proximal site and found to be important for c-Myb trans activation. DNA binding was necessary for c-myc activation, as shown by the loss of function associated with mutation of Myb's DNA-binding domain and by trans-dominant repressor activity of the DNA binding, trans-activation-defective mutant. The involvement of additional protein factors was addressed by inhibiting protein synthesis with cycloheximide in a conditional expression system in which the activity of presynthesized Myb was under the control of estrogen. These experiments indicate that de novo synthesis of additional proteins was not necessary for c-myc trans activation. Together these data reveal two cell lineage-dependent pathways by which c-Myb regulates c-myc; however, both pathways are mechanistically indistinguishable in that direct DNA binding by Myb is required for activating c-myc whereas neither de novo protein synthesis nor other labile proteins are necessary. C1 UNIV N CAROLINA,LINEBERGER COMPREHENS CANC CTR,CHAPEL HILL,NC 27599. UNIV N CAROLINA,DEPT MICROBIOL & IMMUNOL,CHAPEL HILL,NC 27599. NCI,USN,MED ONCOL BRANCH,BETHESDA,MD 20892. UNIV VIRGINIA,DEPT MICROBIOL & IMMUNOL,CHARLOTTESVILLE,VA 22903. SUNY STONY BROOK,DEPT BIOCHEM & CELL BIOL,STONY BROOK,NY 11790. SUNY STONY BROOK,DEPT MICROBIOL,STONY BROOK,NY 11790. FU NCI NIH HHS [CA36246, R01-CA48185]; NIAID NIH HHS [AI29564] NR 61 TC 77 Z9 78 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0270-7306 J9 MOL CELL BIOL JI Mol. Cell. Biol. PD MAY PY 1993 VL 13 IS 5 BP 2858 EP 2869 PG 12 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA KY632 UT WOS:A1993KY63200021 PM 8474446 ER PT J AU DOBOS, PH ELSBERRY, RL AF DOBOS, PH ELSBERRY, RL TI FORECASTING TROPICAL CYCLONE RECURVATURE .1. EVALUATION OF EXISTING METHODS SO MONTHLY WEATHER REVIEW LA English DT Article ID TRACK; AIDS AB The ability of three objective tropical cyclone track prediction aids and of the official forecast to indicate that recurvature will occur within 72 h is evaluated. Recurvature is defined as the change of direction from northwest through north to northeast. For the recurvers, the timing of recurvature is assessed within 12-h categories. The evaluation of a homogeneous set of 366 western North Pacific forecasts from 1979 to 1984 provides a standard of comparison for measuring the relative skill of a new objective recurvature prediction technique in Part II of this study. The one-way influence tropical cyclone model is shown to have the highest skill in predicting recurvature for this sample. C1 USN,POSTGRAD SCH,DEPT METEOROL,CODE MR-ES,MONTEREY,CA 93943. NR 8 TC 6 Z9 6 U1 0 U2 0 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 MAY PY 1993 VL 121 IS 5 BP 1273 EP 1278 DI 10.1175/1520-0493(1993)121<1273:FTCRPI>2.0.CO;2 PG 6 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA LA327 UT WOS:A1993LA32700001 ER PT J AU FORD, DM ELSBERRY, RL HARR, PA DOBOS, PH AF FORD, DM ELSBERRY, RL HARR, PA DOBOS, PH TI FORECASTING TROPICAL CYCLONE RECURVATURE .2. AN OBJECTIVE TECHNIQUE USING AN EMPIRICAL ORTHOGONAL FUNCTION REPRESENTATION OF VORTICITY FIELDS SO MONTHLY WEATHER REVIEW LA English DT Article ID WIND FIELDS; MOTION AB An empirical orthogonal function (EOF) representation of relative vorticity is used to forecast recurvature (change in storm heading from west through north to east of 360-degrees) of western North Pacific tropical cyclones. A pattern recognition approach is adapted in which the synoptic conditions at recurvature time and each 12-h interval up to 96 h prior to recurvature are to be distinguished from the synoptic pattern for straight-mover storms. Synoptic descriptors are defined in terms of the time-dependent principal components of the vorticity fields for the individual maps. A standard discriminant analysis approach using 250-mb vorticity fields correctly identifies recurvers and straight movers in 80% and 66%, respectively, of the 782 cases. For a specific discriminant analysis that is derived to separate recurvers (74% correct) from straight movers (81% correct), the accuracy is higher than for the operational track prediction techniques and the official forecasts considered in Part I of this study. Although the accuracy of the discriminant analysis in identifying the time to recurvature in 12-h intervals is less than desired for operational use, this new technique has higher accuracy than the techniques evaluated in Part 1. Better accuracy can be achieved if the time resolution requirements are relaxed, for example, into three groups (0-24 h, 36-72 h, and greater than 72 h until recurvature). C1 USN,POSTGRAD SCH,DEPT METEOROL,CODE MR-ES,MONTEREY,CA 93943. NR 14 TC 3 Z9 3 U1 0 U2 0 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 MAY PY 1993 VL 121 IS 5 BP 1279 EP 1290 DI 10.1175/1520-0493(1993)121<1279:FTCRPI>2.0.CO;2 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA LA327 UT WOS:A1993LA32700002 ER PT J AU HARRISON, JA WHITE, CT COLTON, RJ BRENNER, DW AF HARRISON, JA WHITE, CT COLTON, RJ BRENNER, DW TI ATOMISTIC SIMULATIONS OF FRICTION AT SLIDING DIAMOND INTERFACES SO MRS BULLETIN LA English DT Article ID SCALE FRICTION; MUSCOVITE MICA; TUNGSTEN TIP; ANISOTROPY; DYNAMICS; MOTION; SLIP RP USN, RES LAB, WASHINGTON, DC 20375 USA. RI Brenner, Donald/D-1741-2009 NR 33 TC 33 Z9 34 U1 0 U2 3 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0883-7694 EI 1938-1425 J9 MRS BULL JI MRS Bull. PD MAY PY 1993 VL 18 IS 5 BP 50 EP 53 PG 4 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA LD300 UT WOS:A1993LD30000007 ER PT J AU PETRY, CR RUMBURG, JW AF PETRY, CR RUMBURG, JW TI ZONAL ELECTRICAL DISTRIBUTION-SYSTEMS - AN AFFORDABLE ARCHITECTURE FOR THE FUTURE SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The electrical system of today's U. S. Navy ships was designed for reliability of power to vital loads. The existing radial electrical system architecture has evolved from World War II to an increasingly complex and expensive system as vital loads have grown and become more power quality sensitive for each new class of ships. The maze of normal and alternate cables on modern navy ships is almost impossible to protect and keep functioning during and after a casualty. The Navy is now demanding that future ships be more affordable while maintaining existing performance capabilities. New studies have shown that zonal electrical distribution system architecture provides a construction cost savings while inherently providing more operational flexibility. This paper will discuss cost and weight comparisons of existing conventional electrical distribution systems to proposed zonal distribution systems on DDG-51 and LSD-41 class ships. It will examine the weight impacts and affordability of installing the zonal distribution system on these ships. Further, it will discuss various zonal distribution system architectures, commonality of components with surface ship electrical distribution systems, and propose developments which will enhance future navy and maritime ship construction. RP PETRY, CR (reprint author), USN,CTR SURFACE WARFARE,DEPT PROPULS & AUXILIARIES,DIV ELECT SYST,ANNAPOLIS,MD 21402, USA. NR 0 TC 19 Z9 19 U1 0 U2 2 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1993 VL 105 IS 3 BP 45 EP 51 PG 7 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU895 UT WOS:A1993LU89500002 ER PT J AU HARDER, G MARTIN, RA AF HARDER, G MARTIN, RA TI PERFORMANCE TESTING OF SHIPBOARD ELECTRONIC SYSTEMS SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Performance evaluation of shipboard electronic systems entails debugging the systems in a laboratory environment, placing them in service and relving on svstem operators to provide feedback. General testing can be performed at selected sites by system designers, but each site where equipment is to be installed can offer unique problems. It is impossible to predict all the scenarios. Unique problems are more the rule than the exception when equipment is destined for Navy ships. Ship deployments make for difficult logistics when sending test teams to evaluate system failures. So, out of necessity, if newly installed equipment receives the proper inputs and generates the proper outputs, it is accepted and becomes the sailor's responsibilitv to maintain. In cases where documentation is ambiguous or incomplete, it is left to the sailor's ingenuity to continue testing and training on equipment. This is generallv obtained through computer simulations and back-to-back testing which can provide results for ideal conditions, but does not take the dynamics of interference into account. Remote site testing is the only way to get a true representation of equipment performance and training problems. Electronic system operators on board Navy vessels are fortunate, thev have help. There exists an organization available near major naval ports worldwide whose existence is to test electronic systems performance. The testing utilizes electronic systems as they would normally be configured for operations. This organization is the Shipboard Electronic Svstem Evaluation Facility (SESEF). RP HARDER, G (reprint author), USN,UNDERSEA WARFARE CTR DETACHMENT NORFOLKS ELECTROMAGNET ENGN BRANCH,NORFOLK,VA 23511, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1993 VL 105 IS 3 BP 118 EP 124 PG 7 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU895 UT WOS:A1993LU89500010 ER PT J AU MARSHALL, BR AF MARSHALL, BR TI SYSTEM CALIBRATION OF AUTOMATED MACHINERY CONTROLS SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Virtually every Navy engineering system includes measurement devices for operation and/or control. For these purposes, a large population of instruments has been installed in the fleet over the years. With the introduction of automated machinery control systems came certain operational difficulties which pointed to a need for improved support of all installed shipboard instrumentation. Control and measurement systems can comprise complex arrangements of components which operate as sensor-to-readout chains. To achieve necessary accuracies, these systems present challenges regarding alignment, calibration, and associated logistics. This paper discusses a successful, fleet-friendly effort which supports these requirements: the Shipboard Instrumentation and Systems Calibration (SISCAL) Program. The program provides an effective, uniform method to control and execute the ever-increasing instrument/system calibration requirements on Navy ships. As it evolved, the process resulted in unforeseen synergy and was expanded to include many ship classes and systems. The background leading to the development of this program is reviewed, and svstem application details are presented. Advantages to operators and support personnel are described, including improved system performance capability, standardization of calibration coverage and configuration management, reduction of organizational and intermediate level workload, and resolution of conflicts with other engineering documentation. RP MARSHALL, BR (reprint author), USN,CTR SURFACE WARFARE,DIV CARDEROCK,PHILADELPHIA,PA, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1993 VL 105 IS 3 BP 125 EP 136 PG 12 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU895 UT WOS:A1993LU89500011 ER PT J AU GREEN, MW AF GREEN, MW TI LOGISTIC SUPPORT ANALYSIS - LESSONS TO BE LEARNED SO NAVAL ENGINEERS JOURNAL LA English DT Article AB For years in Navy system/equipment acquisitions, a program requirement that has been particularly troublesome to program managers (PMs), integrated logistic support managers (ILSMs), and logistic element managers (LEMs) is logistic support analysis (LSA). Performance of the tasks to satisfy this LSA requirement has dismayed manv logistics engineers and analysts as well. Unfortunately, what has caused such consternation in the past is still present and shall negatively impact LSA requirements in the future unless some reformation occurs. A few of the main problems encountered when involved with an LSA are: the analysis is started too late; the effort is complex and diverse; the LSA militarv standards contain ambiguities, vague descriptions, and other dericiencies; and the LSA process allows many possible approaches leading to results with numerous possible interpretations. In manv cases, expensive LSA processes produce data that is neither timely nor of great use. The result of an inefficient LSA is usually a bandaided end item in the field, one without adequate and cost-effective support. This paper addresses LSA-related problems, evidenced through research and personal experience, and recommends solutions to enhance the LSA process. This paper also stresses conducting the appropriate amount of analvsis (through tailoring) to derive the ideal supportability system one of sufficient performance that maximizes life cycle affordability. RP GREEN, MW (reprint author), USN,CTR SURFACE WARFARE,DEPT COMBAT SYST,DIV QUAL ENGN,DAHLGREN,VA 22448, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1993 VL 105 IS 3 BP 137 EP 145 PG 9 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU895 UT WOS:A1993LU89500012 ER PT J AU GLEANER, I ARTER, R AF GLEANER, I ARTER, R TI NAVAL AVIATION PACKAGING IMPROVEMENT INITIATIVE SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The Packaging Improvement Initiative is a Navy wide effort to optimize operational readiness, limit degradation, minimize logistic costs, and reduce repair costs and turn-around-times of Naval Aviation Depot Level Repairables (AVDLRs) by improving packaging, handling, storage, and transportation techniques throughout the complete logistics cycle. Using Total Quality Leadership tools with continuous customer feedback. the Naval Aviation Supply Office has developed several goal-oriented strategies, encompassing short-, mid-, and long-term improvements. Rather than merelv refining the present system, the strategies listed below reflect evaluation and restructuring of packaging processes at sites with varying capabilities and missions. Principal strategies include: 1. Packaging repairables in accordance with existing requirements, after repair at a depot, 2. Having sufficient quantities of reusable containers in place at required locations, 3. Ensuring use of containers for retrograde shipments, 4. Developing improved processes to enable afloat customers to properly protect repairables, 5. Reviewing item repair cost, turn-around-time, and reliability impacts, 6. Performing engineering analyses of shipboard material flow, 7. Development of multi-item reusable containers, and 8. The merging of resultant initiative savings with Defense Management Review Decisions (DMRDs) to reduce repair, warehousing, handling, and transportation costs. RP GLEANER, I (reprint author), USN,AVIAT SUPPLY OFF,PACKAGING PROGRAMS MANAGEMENT BRANCH,PHILADELPHIA,PA, USA. NR 0 TC 0 Z9 1 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1993 VL 105 IS 3 BP 146 EP 151 PG 6 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU895 UT WOS:A1993LU89500013 ER PT J AU SUITT, D GIRONA, F AF SUITT, D GIRONA, F TI DEVELOPMENT OF A STANDARD FAMILY OF COMPOSITE-MATERIAL CENTRIFUGAL PUMPS FOR NAVAL SURFACE SHIPS SO NAVAL ENGINEERS JOURNAL LA English DT Article AB This paper discusses a program to develop a family of standard design, low-pressure, composite material centrifugal pumps for Navy surface ship applications. The need for and the benefits derived from the development of this standard family of centrifugal pumps is discussed. Foremost of the projected benerits is a savings of 25% in acquisition and provisioning costs as well as significant reduction in integrated logistic supply costs. Additional benefits detailed are the reduction of maintenance requirements and improvements in serviceability expected from pumps manufactured from composite materials. A program to evaluate commercial composite pumps to determine compliance with Navv design requirements is detailed. The design criteria for the standard family of composite pumps is provided as is the status of a competitively awarded contract for this design. Contained within the discussions of the contract status is a description of efforts to provide state-of-the-art sealing for the new pumps. The paper also addresses the manner in which the standard design composite pumps will be introduced to the neet. RP SUITT, D (reprint author), USN,CTR SURFACE WARFARE,DEPT PROPULS & AUXILIARY SYST,DIV CARDEROCK,ANNAPOLIS,MD 21402, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1993 VL 105 IS 3 BP 167 EP 180 PG 14 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU895 UT WOS:A1993LU89500015 ER PT J AU SMITH, PH CHUA, DL FLEISCHMANN, CW JAMES, SD AF SMITH, PH CHUA, DL FLEISCHMANN, CW JAMES, SD TI HIGH-ENERGY DENSITY LITHIUM RECHARGEABLE BATTERIES FOR UNDERWATER VEHICLE PROPULSION SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The rechargeable lithium/cobalt oxide electrochemistry is examined for its use in powering underwater vehicles. It has been successfullv developed in 30 amp hour capacity cells. A comparative studv with the silver oxide/zinc technology, most frequently used for this application, revealed lithium's superior performance. Lithium/cobalt oxide gave more charge-discharge cycles with 40-50% higher energy density. Lithium's advantage was especiallv marked at -2-degrees-C, where it cycled four times longer than silver cells. Projections indicate that, at the 600 amp hour cell size, the battery will have an energy density of 120 watt hours per pound resulting in a more durable and cost effective power source for naval vehicles than currentlv possible. RP SMITH, PH (reprint author), USN,CTR SURFACE WARFARE,ELECTROCHEM BRANCH,BATTERY RES & DEV GRP,DAHLGREN,VA 22448, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1993 VL 105 IS 3 BP 181 EP 186 PG 6 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU895 UT WOS:A1993LU89500016 ER PT J AU GREER, RA AF GREER, RA TI THE NAVIGATION SENSOR SYSTEM INTERFACE PROJECT SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The AN/SSN-6 Navigation Sensor System Interface (NavSSI) Project is a new system being designed with two primarv objectives; processing/distribution of navigation data and the displav/operation of digital nautical charts. NavSSI will be the United States Navv Electronic Chart Displav & Information Svstem (ECDIS), meaning naval vessels can navigate using NavSSI for ownship plotting instead of the traditional paper nautical charts. This paper will present the background on the project and provide a technical description of the hardware and software architecture. The Digital Nautical Chart (DNC) database will be described with special focus on the technical specifications and the NavSSI operational software using DNC. There will be a brief discussion of the legal concerns of using an electronic navigation chart instead of the paper nautical chart. There are still manv kev issues regarding the DNC database to be resolved and these will be presented. RP GREER, RA (reprint author), USN,CTR UNDERSEA WARFARE,NORFOLK,VA 23511, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1993 VL 105 IS 3 BP 187 EP 191 PG 5 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU895 UT WOS:A1993LU89500017 ER PT J AU LEVEDAHL, WJ AF LEVEDAHL, WJ TI A CAPABLE, AFFORDABLE 21ST-CENTURY DESTROYER SO NAVAL ENGINEERS JOURNAL LA English DT Article AB A simple tumblehome hull of 4500LT lightship displacement carries 1200LT of military payload 6000NMi at 20kts with inherently-low acoustic, infrared, and radar signatures, and with superior seakeeping, without seawater ballast. Its two intercooled, recuperated turbines replace the seven simple-cycle engines of a comparably-armed conventional destroyer and consume 59% less fuel; both ships share a 30kt sustained speed at 80% power. Use of stern flaps permits carrving more fuel; range is doubled to 12,000 NMi. Two removable, prealigned and pretested steerable propulsor modules are attached to the stern after construction and are pierside replaceable without drydocking; each includes a steerable pod aligned to the water inflow. Contrarotating tractor propellers are driven by a pretested integrated capsule which comprises seals, thrust bearings, contrarotating ringring bicoupled epicyclic gears, and an alternating-current electric motor. A streamlined strut connects each pod rigidlv to a vertical steerable barrel which contains the individually-replaceable propulsor auxiliaries. Two power modules are removable and are mounted in the helicopter hangar. Each module comprises a 26,400 HP intercooled regenerated gas turbine, a 3 Mw ship-service generator, and a propulsion generator with a second high-voltage winding for electrothermal guns. RP LEVEDAHL, WJ (reprint author), USN,CTR SURFACE WARFARE,DIV CARDEROCK,ANNAPOLIS,MD 21402, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1993 VL 105 IS 3 BP 213 EP 223 PG 11 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA LU895 UT WOS:A1993LU89500020 ER PT J AU COULLARD, CR RAIS, A RARDIN, RL WAGNER, DK AF COULLARD, CR RAIS, A RARDIN, RL WAGNER, DK TI LINEAR-TIME ALGORITHMS FOR THE 2-CONNECTED STEINER SUBGRAPH PROBLEM ON SPECIAL CLASSES OF GRAPHS SO NETWORKS LA English DT Article ID NETWORKS; CONSTRAINTS AB The 2-connected Steiner subgraph problem is that of finding a minimum-weight 2-connected subgraph that spans a subset of distinguished vertices. This paper presents linear-time algorithms for solving the 2-connected Steiner subgraph problem on two special classes of graphs, W4-free graphs and Halin graphs. Although different in detail, the algorithms adopt a common strategy exploiting known decompositions. As a special case, the algorithms also solve the Traveling Salesman Problem on W4-free graphs and Halin graphs. C1 UNIV CATHOLIQUE LOUVAIN, CTR OPERAT RES & ECONOMETR, B-1348 LOUVAIN, BELGIUM. PURDUE UNIV, SCH IND ENGN, W LAFAYETTE, IN 47907 USA. OFF NAVAL RES, DIV MATH SCI, ARLINGTON, VA 22217 USA. RP COULLARD, CR (reprint author), NORTHWESTERN UNIV, DEPT IND ENGN & MANAGEMENT SCI, EVANSTON, IL 60208 USA. RI Rais, Abdur/D-8847-2017 OI Rais, Abdur/0000-0003-1906-9684 NR 21 TC 14 Z9 15 U1 0 U2 0 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0028-3045 EI 1097-0037 J9 NETWORKS JI Networks PD MAY PY 1993 VL 23 IS 3 BP 195 EP 206 DI 10.1002/net.3230230307 PG 12 WC Computer Science, Hardware & Architecture; Operations Research & Management Science SC Computer Science; Operations Research & Management Science GA KZ110 UT WOS:A1993KZ11000006 ER PT J AU SAHIN, I HYMAN, M AF SAHIN, I HYMAN, M TI NUMERICAL-CALCULATION FOR THE FLOW OF SUBMERGED BODIES UNDER A FREE-SURFACE SO OCEAN ENGINEERING LA English DT Note AB The flow field generated by a Rankine body moving under a free surface in a finite-depth water is calculated by potential theory. Velocity field generated by a source located at the origin is calculated first by using highly efficient and adaptive quadratures of the QUADPACK library. This solution is used for generating the flow around a Rankine body by locating a source and an equal strength sink along the body axis. Results agree well with the existing literature. C1 USN,CTR COASTAL SYST,PANAMA CITY,FL 32401. RP SAHIN, I (reprint author), WESTERN MICHIGAN UNIV,DEPT MECH & AERONAUT ENGN,KALAMAZOO,MI 49008, USA. NR 7 TC 5 Z9 8 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0029-8018 J9 OCEAN ENG JI Ocean Eng. PD MAY PY 1993 VL 20 IS 3 BP 339 EP 347 DI 10.1016/0029-8018(93)90028-G PG 9 WC Engineering, Marine; Engineering, Civil; Engineering, Ocean; Oceanography SC Engineering; Oceanography GA KR842 UT WOS:A1993KR84200008 ER PT J AU FELIX, CA STRAUSS, EA DAMICO, D TSOKOS, M WINTER, S MITSUDOMI, T NAU, MM BROWN, DL LEAHEY, AM HOROWITZ, ME POPLACK, DG COSTIN, D MINNA, JD AF FELIX, CA STRAUSS, EA DAMICO, D TSOKOS, M WINTER, S MITSUDOMI, T NAU, MM BROWN, DL LEAHEY, AM HOROWITZ, ME POPLACK, DG COSTIN, D MINNA, JD TI A NOVEL GERMLINE P53 SPLICING MUTATION IN A PEDIATRIC-PATIENT WITH A 2ND MALIGNANT NEOPLASM SO ONCOGENE LA English DT Article ID CELLULAR PROTEIN P53; BREAST-CANCER; GENE; TUMOR; RETINOBLASTOMA; IDENTIFICATION; ANTIBODIES; EXPRESSION; COMPLEX AB A novel germline p53 splicing mutation was identified in a pediatric patient with two metachronous primary cancers that are constituent tumors of the Li-Fraumeni syndrome. Genomic DNA from the second tumor showed the same mutation and loss of heterozygosity at the p53 locus. The mutant mRNA and protein were present in the tumor tissue. In contrast, in the normal tissues bearing the germline mutation in the heterozygous state, predominantly normal mRNA was expressed and the mutant p53 protein was not detectable. The functional silence and relative lack of mutant p53 mRNA expression in the normal tissues of this patient may be caused by decreased stability or decreased production. If this proves a more general pattern of expression of mutant p53 in individuals with germline mutations, these findings may explain the paucity of tumors in individuals affected with the Li-Fraumeni syndrome. C1 USN,MED ONCOL BRANCH,BETHESDA,MD 20892. UNIV TEXAS,SW MED CTR,SIMMONS COMPREHENS CANC RES CTR,DALLAS,TX 75235. NCI,PEDIAT BRANCH,BETHESDA,MD 20892. NCI,MED BRANCH,BETHESDA,MD 20892. NCI,PATHOL LAB,BETHESDA,MD 20892. RP FELIX, CA (reprint author), CHILDRENS HOSP,DEPT PEDIAT,DIV ONCOL,34TH ST & CIVIC CTR BLVD,ROOM 9093,PHILADELPHIA,PA 19104, USA. NR 44 TC 48 Z9 48 U1 0 U2 0 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0950-9232 J9 ONCOGENE JI Oncogene PD MAY PY 1993 VL 8 IS 5 BP 1203 EP 1210 PG 8 WC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity GA KY328 UT WOS:A1993KY32800011 PM 8479743 ER PT J AU DAVIS, MA WANSER, KH KERSEY, AD AF DAVIS, MA WANSER, KH KERSEY, AD TI REFLECTIVE FIBER RING RESONATOR WITH POLARIZATION-INDEPENDENT OPERATION SO OPTICS LETTERS LA English DT Article AB A polarization-insensitive fiber-optic ring-resonator configuration based on a reflective mode of operation with a Faraday rotator mirror for birefringence compensation is reported. An output resonant-dip transfer function that is independent of the input polarization to the system is obtained, which is shown to produce a stable scale factor of the system. RP DAVIS, MA (reprint author), USN,RES LAB,OPT TECH BRANCH,CODE 5674,WASHINGTON,DC 20375, USA. NR 9 TC 4 Z9 4 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD MAY 1 PY 1993 VL 18 IS 9 BP 750 EP 752 DI 10.1364/OL.18.000750 PG 3 WC Optics SC Optics GA KY942 UT WOS:A1993KY94200028 PM 19802261 ER PT J AU GUEDRY, FE AF GUEDRY, FE TI SPACE VESTIBULO-NEUROSCIENCE IN THE NEW CENTURY - WHY PROCEED IN SEMI-DARKNESS SO ORL-JOURNAL FOR OTO-RHINO-LARYNGOLOGY AND ITS RELATED SPECIALTIES LA English DT Article DE SPATIAL ORIENTATION; PERCEPTION DYNAMICS; INTERACTIONS; VESTIBULAR; ACCELERATION AB With advancing technology, neuroscientists have explored vestibular transducer microstructure and molecular processes, neural pathways of interaction between vestibular visual and proprioceptor systems and neurochemical processes of adaptive change. Progress in space vestibulo-neuroscience will be fostered by focus on interactions among the systems involved in whole-body movement relative to the earth. Description of perceptual and sensorimotor reactions to complex accelerative stimuli during goal-directed and passive movement is crucial to conceptualizing the functional significance of various interactions and viable theory. The vestibulo-ocular reflex is now quantifiable in three dimensions, but description of the dynamics of spatial orientation perception has progressed very little in the 20th century. Much is known about perception of static body tilt, but the dynamics of tilt and movement perception (beyond rotation about an earth-vertical axis) remains relatively unexplored. Innovative procedures and departure from accepted psychophysics are needed. Models developed to predict the dynamics of spatial orientation under complex conditions must be consistent with information at all levels (neural, sensorimotor, and perceptual). To close our eyes to any one aspect of the spatial orientation reaction is to proceed in semi-darkness unnecessarily. RP GUEDRY, FE (reprint author), USN,AEROSP MED RES LAB,AIR STN,PENSACOLA,FL 32508, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU KARGER PI BASEL PA ALLSCHWILERSTRASSE 10, CH-4009 BASEL, SWITZERLAND SN 0301-1569 J9 ORL J OTO-RHINO-LARY JI ORL-J. Oto-Rhino-Laryngol. Relat. Spec. PD MAY-JUN PY 1993 VL 55 IS 3 BP 167 EP 172 PG 6 WC Otorhinolaryngology SC Otorhinolaryngology GA LB577 UT WOS:A1993LB57700010 PM 8321550 ER PT J AU PRIEBE, CE MARCHETTE, DJ AF PRIEBE, CE MARCHETTE, DJ TI ADAPTIVE MIXTURE DENSITY-ESTIMATION SO PATTERN RECOGNITION LA English DT Article DE DENSITY ESTIMATION; KERNEL ESTIMATOR; MIXTURE MODEL; STOCHASTIC APPROXIMATION; RECURSIVE ESTIMATION; NONPARAMETRIC ESTIMATION; METHOD OF SIEVES; MAXIMUM LIKELIHOOD; EM ALGORITHM ID MAXIMUM-LIKELIHOOD; PROBABILITY DENSITY; NEURAL NETWORKS; INCOMPLETE DATA AB A recursive, nonparametric method is developed for performing density estimation derived from mixture models, kernel estimation and stochastic approximation. The asymptotic performance of the method, dubbed ''adaptive mixtures'' (Priebe and Marchette, Pattern Recognition 24,1197-1209 (1991)) for its data-driven development of a mixture model approximation to the true density, is investigated using the method of sieves. Simulations are included indicating convergence properties for some simple examples. C1 USN,CTR OCEAN SYST,SAN DIEGO,CA 92152. RP PRIEBE, CE (reprint author), USN,CTR SURFACE WARFARE,DEPT SYST RES & TECHNOL,CODE B10,DAHLGREN,VA 22448, USA. RI Priebe, Carey E./A-3305-2010 NR 42 TC 29 Z9 31 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0031-3203 J9 PATTERN RECOGN JI Pattern Recognit. PD MAY PY 1993 VL 26 IS 5 BP 771 EP 785 DI 10.1016/0031-3203(93)90130-O PG 15 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA LK644 UT WOS:A1993LK64400012 ER PT J AU MAJDE, JA AF MAJDE, JA TI MICROBIAL CELL-WALL CONTAMINANTS IN PEPTIDES - A POTENTIAL SOURCE OF PHYSIOLOGICAL ARTIFACTS SO PEPTIDES LA English DT Review DE PYROGEN; ENDOTOXIN; LIPOPOLYSACCHARIDE; PEPTIDOGLYCAN; BACTERIA; FUNGI; MYCOPLASMA; MICROBIAL CELL-WALL PRODUCT; CYTOKINE; HORMONE; NITRIC OXIDE; EICOSENOID; PHYSIOLOGY; CONTAMINATION; ARTIFACT ID TUMOR-NECROSIS-FACTOR; ENDOTOXIN CONTAMINATION; PROTEIN SOLUTIONS; ESCHERICHIA-COLI; INTERLEUKIN-1; VIRUS; MICE; LIPOPOLYSACCHARIDE; MACROPHAGES; RESISTANCE AB Microbial cell-wall products (MCWP) such as endotoxins are easily introduced into peptides produced under standard laboratory conditions. Because these products stimulate the induction of cytokines and other mediators, which, in turn, trigger a broad range of physiological responses, MCWP in peptide preparations are potential sources of artifacts. This brief tutorial outlines the physical/chemical nature of MCWP, some of their sources, their physiological effects, and a simple method to control for them in some peptide preparations. RP MAJDE, JA (reprint author), OFF NAVAL RES,800 N QUINCY ST,ARLINGTON,VA 22217, USA. NR 37 TC 39 Z9 40 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0196-9781 J9 PEPTIDES JI Peptides PD MAY-JUN PY 1993 VL 14 IS 3 BP 629 EP 632 DI 10.1016/0196-9781(93)90155-A PG 4 WC Biochemistry & Molecular Biology; Endocrinology & Metabolism; Pharmacology & Pharmacy SC Biochemistry & Molecular Biology; Endocrinology & Metabolism; Pharmacology & Pharmacy GA LD181 UT WOS:A1993LD18100030 PM 8332558 ER PT J AU RAJAGOPAL, AK AF RAJAGOPAL, AK TI COORDINATE AND MOMENTUM REPRESENTATIONS OF THE Q-DEFORMED OSCILLATOR AND THEIR INTERPRETATION SO PHYSICAL REVIEW A LA English DT Note ID QUANTUM AB A derivation of the coordinate representation of the q-deformed oscillator is given. The Hilbert space associated with it is defined on a finite coordinate space y: (-pi/2s,pi/2s), where s is related to the deformation q via q = exp(-s2), with the respective ''coordinate'' and ''momentum'' operators given by X(s) = y - A(s)(y), P(s) = -id/dy - iA(s)(y), where A(s)(y) = 1/2d lnsigma(s)(y)/dy, sigma(s), being a measure in this space. The commutation rule obeyed by them is X(s)P(s)-P(s)X(s) = iHBAR(s)(y) = i{1-d A(s)/dy}. After constructing a suitable representation in the momentum space, we also set up the Wigner distribution function in this phase space. A brief discussion of these results and their interpretation are given. RP RAJAGOPAL, AK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 5 TC 6 Z9 6 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAY PY 1993 VL 47 IS 5 BP R3465 EP R3467 PN A PG 3 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA LB805 UT WOS:A1993LB80500001 ER PT J AU BANDAK, FA TSAI, DH ARMSTRONG, RW DOUGLAS, AS AF BANDAK, FA TSAI, DH ARMSTRONG, RW DOUGLAS, AS TI FORMATION OF NANODISLOCATION DIPOLES IN SHOCK-COMPRESSED CRYSTALS SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-DYNAMICS AB Molecular-dynamics modeling has been used to study the evolution of a dislocation nanostructure from the shock compression of a vacancy cluster in a body-centered-cubic lattice. Detailed calculations have revealed the atomic displacements by which the clustered vacancies collapse. The energetics of the process were also monitored in detail. Stable [100] and [111] Burgers-vector dislocations have been identified in dipole configurations. These dislocations relate to a periodic nanodislocation dipole structure proposed in a model by Armstrong, Miller, and Sandusky (AMS) to occur by the reaction of dislocations just behind the shock front. The postshock stability of the AMS dipole nanostructure was also evaluated on a molecular-dynamics basis and the stress-strain behaviors of the crystal for the pre- and postshock compression conditions were compared. C1 JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20878. UNIV MARYLAND,COLL PK,MD 20742. RP BANDAK, FA (reprint author), USN,CTR SURFACE WARFARE,WHITE OAK LAB,SILVER SPRING,MD 20903, USA. RI Douglas, Andrew/C-6862-2009 NR 17 TC 22 Z9 23 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 MAY 1 PY 1993 VL 47 IS 18 BP 11681 EP 11687 DI 10.1103/PhysRevB.47.11681 PG 7 WC Physics, Condensed Matter SC Physics GA LD189 UT WOS:A1993LD18900004 ER PT J AU SPRUNT, S NOUNESIS, G LITSTER, JD RATNA, B SHASHIDHAR, R AF SPRUNT, S NOUNESIS, G LITSTER, JD RATNA, B SHASHIDHAR, R TI DYNAMICS OF PHOSPHOLIPID TUBULES IN A CONCENTRATED-SOLUTION - RESULTS FROM HIGH-FIELD MAGNETIC BIREFRINGENCE AND QUASI-ELASTIC LIGHT-SCATTERING SO PHYSICAL REVIEW E LA English DT Article ID TOBACCO MOSAIC-VIRUS; TRANSLATIONAL DIFFUSION; RODLIKE POLYMERS; ELECTRIC BIREFRINGENCE; ISOTROPIC-PHASE; LIPID TUBULES; MACROMOLECULES; MICROSTRUCTURES; SUSPENSIONS; ANISOTROPY AB The dynamical diffusion of phospholipid tubules in highly concentrated solution has been studied as a function of temperature by high-field magnetic birefringence and by dynamic light scattering in zero field. Data at a temperature well below the lipid chain-melting transition T = T(m) are analyzed using theoretical predictions for rigid-rod dynamics. While qualitatively successful, these lead to an estimate of the rotational diffusion constant which is larger than that anticipated when dynamical rod entanglement in a homogeneous solution is the only effect considered at high concentration. For T--> T(m), the results from both experimental techniques exhibit a marked temperature dependence, revealing dynamical studies to be a sensitive and potentially interesting probe of the phase transformation at T(m). C1 USN,RES LAB,WASHINGTON,DC 20375. GEORGETOWN UNIV,MED CTR,DEPT BIOCHEM,WASHINGTON,DC 20007. RP SPRUNT, S (reprint author), MIT,FRANCIS BITTER NATL MAGNET LAB,CAMBRIDGE,MA 02139, USA. NR 39 TC 2 Z9 2 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD MAY PY 1993 VL 47 IS 5 BP 3477 EP 3484 DI 10.1103/PhysRevE.47.3477 PG 8 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LF067 UT WOS:A1993LF06700056 ER PT J AU BULSARA, AR SCHMERA, G AF BULSARA, AR SCHMERA, G TI STOCHASTIC RESONANCE IN GLOBALLY COUPLED NONLINEAR OSCILLATORS SO PHYSICAL REVIEW E LA English DT Note ID SINGLE NEURON; SYSTEMS; MODEL AB We consider a network of N globally coupled nonlinear overdamped oscillators subject to Langevin noise and a weak periodic modulation. Assuming that one of the oscillators relaxes to its steady state on a time scale far slower than the remaining oscillators in the network, we obtain its dynamics from the coupled stochastic differential equations describing the system, via adiabatic elimination. The bifurcation properties of this ''reduced oscillator'' model are discussed, together with cooperative stochastic effects (e.g., stochastic resonance) that result from the presence of the modulation. RP BULSARA, AR (reprint author), USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,DIV RES DEV TECHNOL,SAN DIEGO,CA 92152, USA. NR 23 TC 95 Z9 96 U1 1 U2 10 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 MAY PY 1993 VL 47 IS 5 BP 3734 EP 3737 DI 10.1103/PhysRevE.47.3734 PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LF067 UT WOS:A1993LF06700087 ER PT J AU GANGULY, AK PARK, GS ARMSTRONG, CM AF GANGULY, AK PARK, GS ARMSTRONG, CM TI LINEAR-ANALYSIS OF BACKWARD-WAVE OSCILLATIONS IN AZIMUTHALLY VARYING TRANSVERSE ELECTRIC (TE) MODES SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID GYROTRON AB A linear analysis for a gyrotron backward wave oscillator operating at a general transverse electric (TE(ln)) mode of a cylindrical waveguide (slotted or uniform cross section) has been developed using a Maxwell-Vlasov equation under the tenuous beam approximation. The equation is solved by Laplace transformation to allow easy insertion of the boundary values. The start-oscillations conditions are determined from an interference of the waveguide and beam modes with appropriate amplitudes and phases. The theory is used to determine the design parameters for stable operation of a second cyclotron harmonic gyropeniotron amplifier at 35 GHz in the pi mode of a six vane magnetron-type circuit with a 70 kV, 3 A beam. C1 OMEGA P INC,NEW HAVEN,CT 06520. RP GANGULY, AK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Park, Gunsik/A-1415-2014 NR 18 TC 5 Z9 5 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD MAY PY 1993 VL 5 IS 5 BP 1639 EP 1646 DI 10.1063/1.860960 PG 8 WC Physics, Fluids & Plasmas SC Physics GA LB721 UT WOS:A1993LB72100029 ER PT J AU CHESBROUGH, RM BURKHARD, TK BALSARA, ZN GOFF, WB DAVIS, DJ AF CHESBROUGH, RM BURKHARD, TK BALSARA, ZN GOFF, WB DAVIS, DJ TI SELF-LOCALIZATION IN US OF APPENDICITIS - AN ADDITION TO GRADED COMPRESSION SO RADIOLOGY LA English DT Article DE ABDOMEN, ACUTE CONDITIONS; APPENDICITIS; APPENDIX, US ID DIAGNOSIS; ULTRASONOGRAPHY; SONOGRAPHY AB Graded-compression ultrasound (US) of the right lower quadrant (RLQ) has been a valuable addition to the diagnostic evaluation of acute appendicitis. In an effort to expedite the sonographic evaluation and improve diagnostic accuracy, a method of self-localization was added to the standard graded-compression examination. A total of 236 patients with signs of appendicitis were studied. Eighty-five percent (121 of 142) of the patients with proved appendicitis were able to decisively self-localize their pain. Of the patients without appendicitis who still had significant disease in the RLQ, 88% (29 of 33) were able to self-localize their pain, with an accuracy rate of 86% for significant disease. Among patients without significant disease, only 15% (nine of 61) self-localized their pain. This ''sonographic self-localization sign'' reduced the time of the examination and was a valuable addition to standard graded-compression US of the appendix. RP CHESBROUGH, RM (reprint author), USN HOSP,DEPT RADIOL,SAN DIEGO,CA 92134, USA. NR 11 TC 41 Z9 42 U1 0 U2 0 PU RADIOLOGICAL SOC NORTH AMER PI EASTON PA 20TH AND NORTHAMPTON STS, EASTON, PA 18042 SN 0033-8419 J9 RADIOLOGY JI Radiology PD MAY PY 1993 VL 187 IS 2 BP 349 EP 351 PG 3 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA KY907 UT WOS:A1993KY90700013 PM 8475271 ER PT J AU WU, X PATTERSON, DA BUTLER, LG MILLER, JB AF WU, X PATTERSON, DA BUTLER, LG MILLER, JB TI A BROAD-BAND NUCLEAR-MAGNETIC-RESONANCE SPECTROMETER - DIGITAL PHASE-SHIFTING AND FLEXIBLE PULSE PROGRAMMER SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID NMR AB A simple, low-cost pulse nuclear magnetic resonance (NMR) spectrometer is described. There are two key features of the instrument: (1) all radio frequency phase shifting is done digitally with a new-generation frequency synthesizer and (2) the pulse programmer is based on a high-speed 32-bit parallel interface card in a desktop computer. The spectrometer is well suited for single-frequency channel experiments such as nuclear quadrupole resonance and deuterium quadrupole echo NMR experiments. Because the rf phase shifting is done digitally, the spectrometer operates easily over a wide frequency range, here 10-300 MHz. The pulse programmer and other software functions are written in LabView, a graphical programming language. C1 LOUISIANA STATE UNIV,DEPT CHEM,BATON ROUGE,LA 70803. USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RI Butler, Leslie/D-1636-2016 OI Butler, Leslie/0000-0003-1547-608X NR 6 TC 24 Z9 26 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD MAY PY 1993 VL 64 IS 5 BP 1235 EP 1238 DI 10.1063/1.1144122 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA LB849 UT WOS:A1993LB84900021 ER PT J AU ALTMAN, EI DILELLA, DP IBE, J LEE, K COLTON, RJ AF ALTMAN, EI DILELLA, DP IBE, J LEE, K COLTON, RJ TI DATA ACQUISITION AND CONTROL-SYSTEM FOR MOLECULE AND ATOM-RESOLVED TUNNELING SPECTROSCOPY SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID MICROSCOPY; SURFACE AB A high-speed data acquisition and control system for atom-resolved tunneling spectroscopy based on an 80386 computer and a commercially available data acquisition card is descibed. An analog proportional-integral feedback controller with sample and hold is used to control the scanning tunneling microscope. Constant tip-sample separation during data collection is maintained by interrupting the feedback loop. Assembly language routines taking advantage of the direct memory access capabilities of the data acquisition card are used to minimize the data collection time. A current-to-voltage amplifier based on measuring the voltage drop across a resistor in series with the tunnel junction is used to amplify the tunnel current. This amplifier has a bandwidth of 250 kHz at a gain of 10(9) V/A. The complete system is capable of obtaining an entire tunneling spectrum in 1.5 ms. The system can also simultaneously collect 128 spectroscopic images, a topographic image, and spatially resolved tunneling spectra. Similar techniques can also be used to obtain local barrier height measurements and barrier height images. Scanning tunneling microscopy and spectroscopy data for C60 adsorbed on Au (111 are presented as examples of data collected using this system. RP ALTMAN, EI (reprint author), USN,RES LAB,DIV CHEM,CODE 6177,WASHINGTON,DC 20375, USA. NR 19 TC 12 Z9 12 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 MAY PY 1993 VL 64 IS 5 BP 1239 EP 1243 DI 10.1063/1.1144123 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA LB849 UT WOS:A1993LB84900022 ER PT J AU EDELSTEIN, AS KAATZ, FH CHOW, GM ALTMAN, EI COLTON, RJ PEDERSON, MR MEHL, MJ AF EDELSTEIN, AS KAATZ, FH CHOW, GM ALTMAN, EI COLTON, RJ PEDERSON, MR MEHL, MJ TI FORMATION OF SELF-ARRANGING MO CUBES SO SOLID STATE COMMUNICATIONS LA English DT Article ID METAL PARTICLES; GAS-EVAPORATION; POTENTIALS; SURFACES AB Previous work suggested that 5 mm Mo cubes, formed from a supersaturated vapor, self-organize in the vapor into larger cubes which are 3 x 3 x 3 arrangements of the smaller cubes. Here new experimental results are described that provide an understanding of the narrow size distribution necessary for self-arrangement and the observed bcc structure of the particles. An explanation of the cubic shape of the particles and a calculation for the energy decrease due to self-arrangement are also presented. C1 USN,RES LAB,CTR BIO MOLEC SCI & ENGN,WASHINGTON,DC 20375. USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. USN,RES LAB,DIV CONDENSED MATTER & RADIAT SCI,WASHINGTON,DC 20375. RP EDELSTEIN, AS (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,WASHINGTON,DC 20375, USA. RI Mehl, Michael/H-8814-2016 NR 17 TC 1 Z9 1 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD MAY PY 1993 VL 86 IS 5 BP 323 EP 326 DI 10.1016/0038-1098(93)90382-W PG 4 WC Physics, Condensed Matter SC Physics GA LA658 UT WOS:A1993LA65800012 ER PT J AU PIQUETTE, JC AF PIQUETTE, JC TI EXPLICIT EXPRESSIONS FOR CERTAIN INDEFINITE INTEGRALS CONTAINING THE PRODUCT OF 2 BESSEL-FUNCTIONS OR THE SQUARE OF A LEGENDRE FUNCTION SO UTILITAS MATHEMATICA LA English DT Article AB The two indefinite integrals integral x(l)Zmu(x)ZnuBARdx and integral x(l)[P(nu)(x)]2dx, where Z and ZBAR are arbitrary cylinder functions (i.e., any solutions of Bessel's differential equation) and P is a Legendre function (i.e., either the first or second solution of Legendre's differential equation) am evaluated explicitly for certain very general ranges of the parameters l, mu, nu, and x. (Here, l denotes an integer and mu, nu denote arbitrary numbers.) Many of the results presented here have not been previously tabulated. A new expression for the definite integral integral-1/-1 [P(nu)(x)]2dx which does not explicitly involve the trigamma function psi' is also given. This new series converges more rapidly than that which expresses this integral in terms of psi'. A representation of psi' which may be new is also presented. C1 USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,ORLANDO,FL 32856. NR 23 TC 0 Z9 0 U1 0 U2 1 PU UTIL MATH PUBL INC PI WINNIPEG PA UNIV MANITOBA PO BOX 7 UNIV CENT, WINNIPEG MB R3T 2N2, CANADA SN 0315-3681 J9 UTILITAS MATHEMATICA JI Util. Math. PD MAY PY 1993 VL 43 BP 47 EP 63 PG 17 WC Mathematics, Applied; Statistics & Probability SC Mathematics GA LH589 UT WOS:A1993LH58900005 ER PT J AU LARSON, PA VANHOY, JR MITCHELL, GE AF LARSON, PA VANHOY, JR MITCHELL, GE TI ACQUIRED POLARIZATION IN K.I PNC EXPERIMENTS SO ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI LA English DT Article ID PARITY NONCONSERVATION; NEUTRON RESONANCES; LA-139 AB Parity non-conserving neutron transmission asymmetries have been calculated for unpolarized beams on polarized targets. As the neutron beam propagates through a polarized target, some components are preferentially absorbed. This acquired polarization complicates the interpretation of transmission measurements. We extend the analysis of Postma et al. to include parity mixing in the neutron resonances and emphasize the importance of the nuclear resonance spectroscopy. The relative importance of the acquired polarization contribution is determined by the spectroscopic parameters. C1 N CAROLINA STATE UNIV,RALEIGH,NC 27695. TRIANGLE UNIV NUCL LAB,DUKE STN,DURHAM,NC 27708. RP LARSON, PA (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 35 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0939-7922 J9 Z PHYS A-HADRON NUCL JI Z. Phys. A.-Hadrons Nuclei PD MAY PY 1993 VL 345 IS 3 BP 249 EP 257 DI 10.1007/BF01280831 PG 9 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA LC924 UT WOS:A1993LC92400001 ER PT J AU EASTER, DC BARONAVSKI, AP HAWLEY, M AF EASTER, DC BARONAVSKI, AP HAWLEY, M TI SPECTROSCOPIC EVIDENCE FOR A NONRIGID RIGID TRANSITION IN ISOTOPICALLY LABELED (BENZENE)13 SO CHEMICAL PHYSICS LETTERS LA English DT Article ID FREE JET EXPANSIONS; BENZENE CLUSTERS; ELECTRON-DIFFRACTION; SUPERSONIC JETS; PHASE-CHANGES; LIQUID; STATE AB In a recent report by Easter, Khoury and Whetten, analysis of the ultraviolet (B2u<--A1g(6(0)1)) REMPI spectroscopy of cold (C6H6) (C6D6)n-1 clusters, n = 12-20, yielded striking conclusions: observed C6H6 resonances derive almost exclusively from molecules in the cluster's interior site; and the 13-cluster is found to have only one dominant isomeric form, giving rise to a single prominent spectral feature. Here we report the evolution of the benzene-h6 transition in (C6H6) (C6D6)12 as a function of distance (time) from the nozzle in the supersonic jet expansion, and present the first experimental evidence for a nonrigid-rigid transition in a single-size molecular cluster. Initially (benzene) 13 condenses in a nonrigid state and solidification into a well-defined configuration occurs during subsequent free jet expansion. RP EASTER, DC (reprint author), USN,RES LAB,DIV CHEM,CODE 6110,WASHINGTON,DC 20375, USA. NR 31 TC 7 Z9 7 U1 3 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 APR 30 PY 1993 VL 206 IS 1-4 BP 329 EP 336 DI 10.1016/0009-2614(93)85560-B PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KZ446 UT WOS:A1993KZ44600054 ER PT J AU WILLIAMS, RW KALASINSKY, VF LOWREY, AH AF WILLIAMS, RW KALASINSKY, VF LOWREY, AH TI SCALED QUANTUM-MECHANICAL FORCE-FIELD FOR CIS-GLYCINE AND TRANS-GLYCINE IN ACIDIC SOLUTION SO JOURNAL OF MOLECULAR STRUCTURE-THEOCHEM LA English DT Article ID ALA-X PEPTIDES; ABINITIO; FREQUENCIES AB We obtain one set of ab initio scale factors for two conformational isomers of glycine in acidic solution. Ab initio calculations are performed using the 4-31G basis set. Force constants from two fully optimized glycine-H+.4H2O supermolecules are scaled using vibrational frequencies of glycine in water at pH 0.8. Similar calculations are shown for methylamine-H+ and acetic acid. Reasonable agreement is obtained between calculated and experimental frequencies for glycine-H+, acetic acid, and methylamine-H+. Comparisons between scale factors for these molecules show that scale factors for the same symmetry coordinates are similar in most cases and indicate the extent to which scale factors can be transferred between these molecules. These scale factors are being used to build a scaled quantum mechanical force field for alanine, and subsequently for peptides in aqueous solutions. C1 ARMED FORCES INST PATHOL, DEPT ENVIRONM & TOXICOL PATHOL, WASHINGTON, DC 20306 USA. USN, RES LAB, STRUCT MATTER LAB, WASHINGTON, DC 20375 USA. RP UNIFORMED SERV UNIV HLTH SCI, DEPT BIOCHEM, 4301 JONES BRIDGE RD, BETHESDA, MD 20814 USA. NR 14 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-1280 J9 J MOL STRUC-THEOCHEM JI Theochem-J. Mol. Struct. PD APR 30 PY 1993 VL 100 IS 2-3 BP 157 EP 171 PG 15 WC Chemistry, Physical SC Chemistry GA LD842 UT WOS:A1993LD84200009 ER PT J AU SNOW, AW AF SNOW, AW TI ADSORPTION OF SPIN-LABELED POLYMERS ON CARBON-FIBERS FOR COMPOSITE INTERFACE STUDIES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT WORKSHOP ON INTERFACES IN COMPOSITE MATERIALS CY JUN 17-19, 1992 CL WOODS HOLE, MA AB The adsorption of spin labeled epoxy model compounds and a polymer from solution onto a series of IM6 carbon fibers having incremental oxidative surface treatments was measured. By weight, the amount of epoxy polymer adsorbed was two orders in magnitude greater than that of the model compounds, although the polymer coverage of the fiber surface was less than one monolayer. As the fiber surface oxygen content is increased, substantial increases in adsorption of model compound and epoxy polymer were observed which correlate with a stronger fiber-resin interface. A solvent effect was observed where increasing solvent polarity decreased the amount of model compound adsorption onto the carbon fibers. RP SNOW, AW (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 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 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD APR 30 PY 1993 VL 162 IS 1-2 BP 229 EP 232 DI 10.1016/0921-5093(90)90047-7 PG 4 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA LF638 UT WOS:A1993LF63800024 ER PT J AU SNOW, AW PACE, MD AF SNOW, AW PACE, MD TI SYNTHESIS AND CHARACTERIZATION OF SPIN-LABELED POLYMERS FOR COMPOSITE INTERFACE STUDIES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT WORKSHOP ON INTERFACES IN COMPOSITE MATERIALS CY JUN 17-19, 1992 CL WOODS HOLE, MA ID FIBER AB For the purpose of investigating the epoxy resin composite interface, a series of spin labeled epoxy polymers and model compounds was synthesized and characterized. Linear epoxy polymers were prepared by reacting systematically varying quantities of 4-amino-2,2,6,6-tetramethylpiperid-1-yloxy and cyclohexyl amine with an equivalence bisphenol A diglycidyl ether. The adducts of phenylglycidyl ether and 4-cumylphenylglycidyl ether with 4-amino-2,2,6,6-tetramethylpiperid-1-yloxy were synthesized as model compounds. Characterization determined that the 125-degrees-C polymerization temperature did not cause significant decomposition of the nitroxyl free radical, that magnetic dilution of the spin label in the epoxy polymer to 3% of the amine repeat units is sufficient for observation of unobscured nitroxyl hyperfine structure in the electron spin resonance spectrum of the labeled epoxy polymer in the solid state, and that a polymer glass transition temperature of 66-degrees-C was not affected by variation in the amine composition. RP SNOW, AW (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 TC 1 Z9 1 U1 1 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 APR 30 PY 1993 VL 162 IS 1-2 BP 233 EP 240 DI 10.1016/0921-5093(90)90048-8 PG 8 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA LF638 UT WOS:A1993LF63800025 ER PT J AU SCHMIDT, PP AF SCHMIDT, PP TI HYDROGEN-BONDING - THE ROLE OF HYDROGEN DELOCALIZATION IN THE AHB BOND SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID REACTION SURFACE; PROTON-TRANSFER; PATH; MALONALDEHYDE; DYNAMICS; FIELD AB The behavior of the A-H ... B multiple minimum hydrogen bond can be understood in terms of an analysis similar to the molecular orbital method in molecular electronic quantum theory. Delocalization of hydrogen about two or more wells is described in terms of a linear combination of Gaussian orbitals, each referred to a well minimum. The analysis yields an effective A-B potential mediated by hydrogen. The role of a model three-center interaction in the potential is found to be important and can account for much of the strength of the hydrogen bond. C1 OFF NAVAL RES,DIV MAT,ARLINGTON,VA 22217. RP SCHMIDT, PP (reprint author), OFF NAVAL RES,DIV CHEM,800 N QUINCY ST,ARLINGTON,VA 22217, USA. NR 34 TC 8 Z9 8 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD APR 29 PY 1993 VL 97 IS 17 BP 4249 EP 4253 DI 10.1021/j100119a001 PG 5 WC Chemistry, Physical SC Chemistry GA LA023 UT WOS:A1993LA02300001 ER PT J AU BUCKLEY, LJ HAMMOND, PT RUBNER, MF AF BUCKLEY, LJ HAMMOND, PT RUBNER, MF TI A MORPHOLOGICAL INVESTIGATION OF POLYURETHANE DIACETYLENE SEGMENTED COPOLYMERS SO MACROMOLECULES LA English DT Note ID ANGLE X-RAY; SCATTERING; ELASTOMERS C1 MIT,DEPT MAT SCI & ENGN,CAMBRIDGE,MA 02139. USN,CTR AIR WARFARE,POLYMER PHYS GRP,WARMINSTER,PA 18974. NR 7 TC 6 Z9 6 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD APR 26 PY 1993 VL 26 IS 9 BP 2380 EP 2382 DI 10.1021/ma00061a035 PG 3 WC Polymer Science SC Polymer Science GA KZ776 UT WOS:A1993KZ77600035 ER PT J AU YOUNG, FC HINSHELWOOD, DD HUBBARD, RF LAMPE, M NERI, JM OLSON, CL OTTINGER, PF ROSE, DV SLINKER, SP STEPHANAKIS, SJ WELCH, DR AF YOUNG, FC HINSHELWOOD, DD HUBBARD, RF LAMPE, M NERI, JM OLSON, CL OTTINGER, PF ROSE, DV SLINKER, SP STEPHANAKIS, SJ WELCH, DR TI CURRENT NEUTRALIZATION OF INTENSE MEV PROTON-BEAMS TRANSPORTED IN LOW-PRESSURE GAS SO PHYSICAL REVIEW LETTERS LA English DT Article ID ION-BEAMS AB This paper reports on the first experiments designed to study ion-beam-induced gas ionization and subsequent conductivity growth using intense proton beams transported through various gases in the 1-Torr pressure regime. Net-current fractions of 2% to 8% are measured outside the beam channel. Ionization is confined predominantly to the beam channel with ionization fractions of a few percent. Analysis suggests that net currents are larger inside the beam channel and that fast electrons and their secondaries carry a significant fraction of the return current in a halo outside the beam. C1 JAYCOR INC,VIENNA,VA 22182. MISSION RES CORP,ALBUQUERQUE,NM 87106. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP YOUNG, FC (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 18 TC 12 Z9 12 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 26 PY 1993 VL 70 IS 17 BP 2573 EP 2576 DI 10.1103/PhysRevLett.70.2573 PG 4 WC Physics, Multidisciplinary SC Physics GA KY503 UT WOS:A1993KY50300017 ER PT J AU VOLAREVIC, S NIKLINSKA, BB BURNS, CM JUNE, CH WEISSMAN, AM ASHWELL, JD AF VOLAREVIC, S NIKLINSKA, BB BURNS, CM JUNE, CH WEISSMAN, AM ASHWELL, JD TI REGULATION OF TCR SIGNALING BY CD45 LACKING TRANSMEMBRANE AND EXTRACELLULAR DOMAINS SO SCIENCE LA English DT Article ID CELL ANTIGEN RECEPTOR; LEUKOCYTE-COMMON ANTIGEN; PROTEIN-TYROSINE PHOSPHATASES; INTERLEUKIN-2 PRODUCTION; T-CELLS; B-CELLS; ASSOCIATION; ACTIVATION; EXPRESSION; PHOSPHORYLATION AB The CD45 protein is a transmembrane tyrosine phosphatase that is required for normal T cell receptor (TCR)-mediated signaling. A chimeric complementary DNA encoding the intracellular enzymatically active portion of murine CD45 preceded by a short amino-terminal sequence from p60c-src was transfected into CD45- T cells. Expression of this chimeric protein corrected most of the TCR signaling abnormalities observed in the absence of CD45, including TCR-mediated enhancement of tyrosine kinase activity and Ca2+ flux. Thus, the enzymatically active intracellular portion of CD45 is sufficient to allow TCR transmembrane signaling. C1 NCI,IMMUNE CELL BIOL LAB,BIOL RESPONSE MODIFIERS PROGRAM,BETHESDA,MD 20892. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20889. NCI,EXPTL IMMUNOL BRANCH,BETHESDA,MD 20892. NR 29 TC 116 Z9 116 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD APR 23 PY 1993 VL 260 IS 5107 BP 541 EP 544 DI 10.1126/science.8475386 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KY504 UT WOS:A1993KY50400034 PM 8475386 ER PT J AU ERICE, A MAYERS, DL STRIKE, DG SANNERUD, KJ MCCUTCHAN, FE HENRY, K BALFOUR, HH AF ERICE, A MAYERS, DL STRIKE, DG SANNERUD, KJ MCCUTCHAN, FE HENRY, K BALFOUR, HH TI BRIEF REPORT - PRIMARY INFECTION WITH ZIDOVUDINE-RESISTANT HUMAN-IMMUNODEFICIENCY-VIRUS TYPE-1 SO NEW ENGLAND JOURNAL OF MEDICINE LA English DT Note ID HIV-1 REVERSE-TRANSCRIPTASE; REDUCED SENSITIVITY; AZT; MUTATIONS; THERAPY C1 UNIV MINNESOTA,SCH MED,DEPT LAB MED & PATHOL,MINNEAPOLIS,MN 55455. UNIV MINNESOTA,SCH MED,DEPT MED,MINNEAPOLIS,MN 55455. UNIV MINNESOTA,SCH MED,DEPT PEDIAT,MINNEAPOLIS,MN 55455. AIDS CLIN TRIALS UNIT,MINNEAPOLIS,MN. WALTER REED ARMY INST RES,USN,MED RES INST,WASHINGTON,DC 20307. WALTER REED ARMY INST RES,DIV RETROVIROL,WASHINGTON,DC 20307. HENRY M JACKSON FDN RES LAB,ROCKVILLE,MD. GRP HLTH INC,RIVERSIDE MED CTR,MINNEAPOLIS,MN. ST PAUL RAMSEY MED CTR,ST PAUL,MN 55101. FU NIADDK NIH HHS [AM13083]; NIAID NIH HHS [AI27761] NR 20 TC 218 Z9 221 U1 0 U2 0 PU MASS MEDICAL SOC PI BOSTON PA 10 SHATTUCK, BOSTON, MA 02115 SN 0028-4793 J9 NEW ENGL J MED JI N. Engl. J. Med. PD APR 22 PY 1993 VL 328 IS 16 BP 1163 EP 1165 DI 10.1056/NEJM199304223281605 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA KY447 UT WOS:A1993KY44700005 PM 8455683 ER PT J AU BERGERON, P RUIZ, MT LEGGETT, SK AF BERGERON, P RUIZ, MT LEGGETT, SK TI G62-46 - AN UNRESOLVED DOUBLE DEGENERATE BINARY CONTAINING A MAGNETIC DA COMPONENT SO ASTROPHYSICAL JOURNAL LA English DT Article DE BINARIES, CLOSE; STARS, INDIVIDUAL (G62-46); STARS, MAGNETIC FIELDS; WHITE DWARFS ID WHITE-DWARFS; NOISE RATIO; HIGH SIGNAL; STARS AB A detailed analysis of the white dwarf star G62-46 is presented. High signal-to-noise spectroscopy reveals Zeeman splitting of the Halpha line profile, indicating the presence of a magnetic field. Model atmosphere calculations are used to demonstrate that the observed energy distribution and line profiles cannot be reconciled with those of a single magnetic hydrogen-line (DA) white dwarf. Instead, G62-46 is shown to be an unresolved double degenerate binary, composed of a featureless DC white dwarf diluting the line profiles of the magnetic DA component. We show from the inferred mass of the DA component that the system most likely has undergone at least one phase of common envelope evolution. The observed line profiles of the DA star are reproduced with a dipole strength of B(d) = 7.4 MG, offset from the center of the star by an amount equal to about one-tenth of the stellar radius. C1 USN OBSERV,FLAGSTAFF,AZ 86002. UNIV SPACE RES ASSOC,COLUMBIA,MD. UNIV CHILE,DEPT ASTRON,SANTIAGO,CHILE. RP BERGERON, P (reprint author), UNIV MONTREAL,DEPT PHYS,CP 6128,SUCC A,MONTREAL H3C 3J7,QUEBEC,CANADA. RI Ruiz, Maria Teresa/I-5770-2016 OI Ruiz, Maria Teresa/0000-0002-6799-1537 NR 26 TC 25 Z9 25 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD APR 20 PY 1993 VL 407 IS 2 BP 733 EP 738 DI 10.1086/172554 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KX399 UT WOS:A1993KX39900028 ER PT J AU STERLING, AC SHIBATA, K MARISKA, JT AF STERLING, AC SHIBATA, K MARISKA, JT TI SOLAR CHROMOSPHERIC AND TRANSITION REGION RESPONSE TO ENERGY DEPOSITION IN THE MIDDLE AND UPPER CHROMOSPHERE SO ASTROPHYSICAL JOURNAL LA English DT Article DE RADIATIVE TRANSFER; SUN, CHROMOSPHERE; SUN, TRANSITION REGION ID LOOP RADIATIVE HYDRODYNAMICS; FLUX-CORRECTED TRANSPORT; REBOUND SHOCK MODEL; X-RAY MICROFLARES; NUMERICAL SIMULATIONS; MAGNETIC NETWORK; HEATING RATE; SPICULES; ALPHA; DYNAMICS AB We present results of a series of numerical simulations modeling chromosphere and transition region response to deposition of thermal energy ranging from approximately 5 x 10(24) to 5 x 10(28) ergs in the middle or upper chromosphere. Assuming an initial model solar atmosphere on a rigid, vertical magnetic flux tube, we introduce a thermal energy source in the middle chromosphere and solve the resulting one-dimensional hydrodynamic equations. Our calculations include the dissipative effects of heat conduction, optically thin radiation losses in the corona, and an approximate expression for the radiation losses of lower temperature plasma. In response to the energy deposition, chromospheric material is ejected into the corona in the form of pressure gradient generated jets, jets with pressure-gradient, and shock-generated components, or high-speed gas plugs. Which category of ejection occurs depends on the spatial and temporal distribution and on the magnitude of the input energy source. Heating of the chromosphere by the source may result in brightenings in Halpha, UV, and/or X-rays, perhaps appearing as the observed brightenings sometimes referred to as ''microflares.'' Some input energy source parameters generate jets with properties similar to those of Halpha spicules. These spicule producing source parameters, however, only rarely result in UV-emitting temperatures in the chromosphere. We therefore conclude that spicules are not produced by UV microflares in general, if the microflares are of the nature described here. C1 COMPUTAT PHYS INCORP, FAIRFAX, VA 22031 USA. NATL ASTRON OBSERV, TOKYO 181, JAPAN. USN, RES LAB, E O HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 54 TC 48 Z9 49 U1 1 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD APR 20 PY 1993 VL 407 IS 2 BP 778 EP 789 DI 10.1086/172559 PN 1 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KX399 UT WOS:A1993KX39900033 ER PT J AU MAISACK, M JOHNSON, WN KINZER, RL STRICKMAN, MS KURFESS, JD CAMERON, RA JUNG, GV GRABELSKY, DA PURCELL, WR ULMER, MP AF MAISACK, M JOHNSON, WN KINZER, RL STRICKMAN, MS KURFESS, JD CAMERON, RA JUNG, GV GRABELSKY, DA PURCELL, WR ULMER, MP TI OSSE OBSERVATIONS OF NGC-4151 SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, INDIVIDUAL (NGC-4151); GALAXIES, SEYFERT; GAMMA RAYS, OBSERVATIONS ID ACTIVE GALACTIC NUCLEI; COMPTON-SCATTERING; PAIR PRODUCTION; REFLECTION; MODELS; VARIABILITY; GALAXIES; SPECTRA; RAYS AB We report results of a 2 week observation of the Seyfert galaxy NGC 4151 with the Oriented Scintillation Spectrometer Experiment (OSSE) instrument on the Compton Gamma Ray Observatory (GRO). The source had a very soft spectrum which is best represented by a broken power law or Sunyaev-Titarchuk thermal Comptonization model. It can be characterized by an exponential shape with an e-folding energy of 39 +/- 2 keV in the energy range 65-300 keV, and an intensity at 100 keV of (2.33 +/- 0.05) x 10(-5) photons cm-2 s-1 keV-1. Source intensity variability of approximately 25% was observed during the 14 days of our observations; no significant change in spectral shape was detected for this period. The steepness and shape of the spectrum above 100 keV rule out (chi2 probability -7 x 10(-4)) simple pair cascade models in a compact source which have been suggested for Seyfert galaxies. C1 GEORGE MASON UNIV,FAIRFAX,VA 22030. USN,E O HULBURT CTR SPACE RES,RES LAB,WASHINGTON,DC 20375. UNIV SPACE RES ASSOC,WASHINGTON,DC 20024. NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208. RI Johnson, Neil/G-3309-2014 NR 29 TC 83 Z9 83 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 APR 20 PY 1993 VL 407 IS 2 BP L61 EP L64 DI 10.1086/186806 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KX400 UT WOS:A1993KX40000006 ER PT J AU PAZIRANDEH, M CAMPBELL, JR AF PAZIRANDEH, M CAMPBELL, JR TI BIOCHEMICAL-CHARACTERIZATION OF RHAPIDOSOMES ISOLATED FROM AQUASPIRILLUM-ITERSONII SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD APR 20 PY 1993 VL 7 IS 7 BP A1155 EP A1155 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA KY848 UT WOS:A1993KY84800678 ER PT J AU SLOOP, J NEEDLEMAN, R AF SLOOP, J NEEDLEMAN, R TI CONSTRUCTION OF AN EXPRESSION SYSTEM - PRODUCTION OF BACTERIORHODOPSIN IN HALOBACTERIUM-VOLCANII SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,CTR SURFACE WARFARE,DAHLGREN,VA 22448. WAYNE STATE UNIV,DETROIT,MI 48201. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD APR 20 PY 1993 VL 7 IS 7 BP A1302 EP A1302 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA KY848 UT WOS:A1993KY84801537 ER PT J AU NISENOFF, M WOLF, SA RITTER, JC PRICE, G AF NISENOFF, M WOLF, SA RITTER, JC PRICE, G TI SPACE APPLICATIONS OF HIGH-TEMPERATURE SUPERCONDUCTIVITY - THE HIGH-TEMPERATURE SUPERCONDUCTIVITY SPACE EXPERIMENT (HTSSE) SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 2ND ISRAELI INTERNATIONAL CONF ON HIGH-TEMPERATURE SUPERCONDUCTIVITY CY JAN 04-08, 1992 CL EILAT, ISRAEL SP CNRS, ITALIAN NATL RES COUNCIL, BRIT COUNCIL, USA, EUROPEAN OFF AEROSP RES & DEV, ISRAELI MINIST FOREIGN AFFAIRS, TEL AVIV UNIV, OREN FAMILY CHAIR EXPTL SOLID STATE PHYS AB The Naval Research Laboratory (NRL) is exploring the feasibility of deploying high temperature superconducting electrical and electronic devices and components in military systems, especially in space. The initial High Temperature Superconductivity Space Experiment (HTSSE-I) will demonstrate that High Temperature Superconducting (HTS) technology is sufficiently robust to survive the space environment and that it has the potential to significantly improved military systems. The devices for this mission have been procured, tested, space qualified and integrated into a space package which was shipped from NRL for on-orbit mission which is scheduled for 1993. The second HTSSE program began in 1991 when contracts were awarded for the procurement of a variety of advanced devices and subsystems based on HTS technology. Two versions of each component in space qualified packages will be delivered to NRL for electrical verification, space qualification, and integration with cryogenic refrigerators and the necessary ambient temperature electronics into a payload which will be in orbit late in 1996. This paper will describe the properties of superconductivity which may impact communications and surveillance systems and describe how HTS can be employed beneficially in operational electronic systems. RP NISENOFF, M (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009 NR 0 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD APR 20 PY 1993 VL 209 IS 1-3 BP 263 EP 268 DI 10.1016/0921-4534(93)90920-L PG 6 WC Physics, Applied SC Physics GA KZ521 UT WOS:A1993KZ52100067 ER PT J AU KRESIN, VZ REEVES, ME WOLF, SA AF KRESIN, VZ REEVES, ME WOLF, SA TI SUPERCONDUCTIVITY, GAPLESS STATE AND ISOTOPE EFFECT IN THE CUPRATES SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article; Proceedings Paper CT 2ND ISRAELI INTERNATIONAL CONF ON HIGH-TEMPERATURE SUPERCONDUCTIVITY CY JAN 04-08, 1992 CL EILAT, ISRAEL SP CNRS, ITALIAN NATL RES COUNCIL, BRIT COUNCIL, USA, EUROPEAN OFF AEROSP RES & DEV, ISRAELI MINIST FOREIGN AFFAIRS, TEL AVIV UNIV, OREN FAMILY CHAIR EXPTL SOLID STATE PHYS ID UPPER CRITICAL-FIELD; MAGNETIC-SUSCEPTIBILITY; CRITICAL-TEMPERATURE; SINGLE-CRYSTALS; YBA2CU3O7; HEAT; TC; PARAMETERS AB The removal of oxygen from YBa2Cu3O7-x has a profound impact on various properties of this compound. The model of induced two gap superconductivity that we developed previously allows us to describe these properties. For example, for compositions between 0 < x <0.15, the energy gap on the chains changes drastically, and in fact. becomes gapless. However, T(c) remains relatively constant, because it is determined mostly by the properties of the planes. We find from specific heat measurements that the electron-phonon coupling on the planes is sufficient to account for the high T(c) in YBa2Cu3O7-x. Furthermore we can explain the unusual doping dependence of the isotope shift to effects of non-adiabaticity of oxygen motion in these compounds. C1 CATHOLIC UNIV AMER,DEPT PHYS,WASHINGTON,DC 20064. USN,RES LAB,WASHINGTON,DC 20375. RP KRESIN, VZ (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Wolf, Stuart/A-7513-2009 NR 44 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD APR 20 PY 1993 VL 209 IS 1-3 BP 319 EP 326 DI 10.1016/0921-4534(93)90933-H PG 8 WC Physics, Applied SC Physics GA KZ521 UT WOS:A1993KZ52100080 ER PT J AU FLANAGAN, J AF FLANAGAN, J TI HELPING CLINTON LOWER THE DEFICIT SO FORTUNE LA English DT Letter RP FLANAGAN, J (reprint author), USN,CHANTILLY,VA, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU TIME INC PI NEW YORK PA TIME & LIFE BUILDING ROCKEFELLER CENTER, NEW YORK, NY 10020-1393 SN 0015-8259 J9 FORTUNE JI Fortune PD APR 19 PY 1993 VL 127 IS 8 BP 38 EP 38 PG 1 WC Business SC Business & Economics GA KU903 UT WOS:A1993KU90300010 ER PT J AU KERTESZ, M FRAPPER, G HONG, SY LEE, YS KIM, OK AF KERTESZ, M FRAPPER, G HONG, SY LEE, YS KIM, OK TI ELECTRONIC-STRUCTURE OF LADDER POLYMERS SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 92 ) CY AUG 12-18, 1992 CL GOTEBERG, SWEDEN ID TRANSITION-METAL COMPLEXES; ELECTRICAL-CONDUCTIVITY; POLYPHENOTHIAZINE; POLYPHENOXAZINE; RESONANCE AB Various types of ladder polymers are compared using geometry optimization and energy band theory. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP KERTESZ, M (reprint author), GEORGETOWN UNIV,DEPT CHEM,WASHINGTON,DC 20057, USA. RI Kertesz, Miklos/E-7122-2010 OI Kertesz, Miklos/0000-0002-7930-3260 NR 30 TC 11 Z9 11 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD APR 19 PY 1993 VL 57 IS 2-3 BP 4344 EP 4349 DI 10.1016/0379-6779(93)90748-L PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA LP138 UT WOS:A1993LP13800022 ER PT J AU SANCHEZ, JL DEFRAITES, RF SHARP, TW HANSON, RK AF SANCHEZ, JL DEFRAITES, RF SHARP, TW HANSON, RK TI MEFLOQUINE OR DOXYCYCLINE PROPHYLAXIS IN UNITED-STATES TROOPS IN SOMALIA SO LANCET LA English DT Letter ID MALARIA C1 USN,MED RES INST,BETHESDA,MD 20814. USN,ENVIRONM & PREVENT MED UNIT 6,HONOLULU,HI. RP SANCHEZ, JL (reprint author), WALTER REED ARMY INST RES,DIV PREVENT MED,WASHINGTON,DC 20307, USA. NR 7 TC 36 Z9 36 U1 0 U2 1 PU LANCET LTD PI LONDON PA 42 BEDFORD SQUARE, LONDON, ENGLAND WC1B 3SL SN 0140-6736 J9 LANCET JI Lancet PD APR 17 PY 1993 VL 341 IS 8851 BP 1021 EP 1022 DI 10.1016/0140-6736(93)91107-W PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA KY368 UT WOS:A1993KY36800030 PM 8096898 ER PT J AU VARGA, JH WOLF, TC JENSEN, HG PARMLEY, VC ROWSEY, JJ AF VARGA, JH WOLF, TC JENSEN, HG PARMLEY, VC ROWSEY, JJ TI COMBINED TREATMENT OF ACANTHAMOEBA KERATITIS WITH PROPAMIDINE, NEOMYCIN, AND POLYHEXAMETHYLENE BIGUANIDE SO AMERICAN JOURNAL OF OPHTHALMOLOGY LA English DT Article ID FREE-LIVING AMEBAS; MANAGEMENT; BAQUACIL; PFLA AB We developed an intensive treatment regimen of topical neomycin, propamidine, and polyhexamethylene biguanide that was tapered to a maintenance level over a 14- to 28-day period as toxicity developed. Since July 1991, we used this treatment on six eyes of five patients in whom Acanthamoeba keratitis was diagnosed clinically. All patients had positive cultures for microorganisms from their corneas or contact lens cases or had pathognomonic findings of pseudodendritic subepithelial infiltrates and radial keratone-uritis. After therapy, all patients improved within two to four weeks, with regression or resolution of neuritis and infiltrates, healing of epithelial defects, and lessening of pain. By three to four months, visual acuity had returned to 20/20 in all eyes. We believe the addition of polyhexamethylene biguanide to our treatment regimen in Acanthamoeba keratitis dramatically aided and hastened the clinical improvement in five consecutive patients and may, with early diagnosis, increase the number of medical cures. C1 UNIV OKLAHOMA,DEAN A MCGEE EYE INST,DEPT OPHTHALMOL,608 S L YOUNG BLVD,OKLAHOMA CITY,OK 73104. USN HOSP,DEPT OPHTHALMOL,CHARLESTON,SC. MADIGAN ARMY MED CTR,DEPT OPHTHALMOL,FT LEWIS,WA. UNIV S FLORIDA,DEPT OPHTHALMOL,TAMPA,FL 33620. NR 13 TC 51 Z9 51 U1 0 U2 0 PU OPHTHALMIC PUBL CO PI CHICAGO PA 77 WEST WACKER DR, STE 660, CHICAGO, IL 60601 SN 0002-9394 J9 AM J OPHTHALMOL JI Am. J. Ophthalmol. PD APR 15 PY 1993 VL 115 IS 4 BP 466 EP 470 PG 5 WC Ophthalmology SC Ophthalmology GA KW262 UT WOS:A1993KW26200008 PM 8470718 ER PT J AU HOLT, WH MOCK, W SOPER, WG COFFEY, CS RAMACHANDRAN, V ARMSTRONG, RW AF HOLT, WH MOCK, W SOPER, WG COFFEY, CS RAMACHANDRAN, V ARMSTRONG, RW TI REVERSE-BALLISTIC IMPACT STUDY OF SHEAR PLUG FORMATION AND DISPLACEMENT IN TI6AL4V ALLOY SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ADIABATIC SHEAR; TITANIUM-ALLOY; TEMPERATURE RISE; BANDS; FRACTURE; TARGETS AB Gas-gun reverse-ballistic experiments have been performed in which Ti6Al4V alloy disks were impacted onto smaller diameter, hardened steel rods to push out shear plugs from the disk material. The range of disk velocities was 219-456 m/s. For each experiment, the disk, plug, and rod were soft recovered after impact. Below 290 m/s, the plugs were pushed only partway through the disks, but localized shear bands outlining the plug shapes were easily recognized in metallographic sections. Optical and scanning electron microscopies were used to determine shear zone widths and to describe microstructural details associated with the primary shear zones. There is evidence for appreciable adiabatic heating and consequent thermal softening and melting of material in the main shear zone. A simple model is used to relate the observed plug displacements to the impact velocities and to provide estimates of several features: the shear zone strength, the threshold energy for shear plug displacement, and the threshold energy for shear plug separation. Clear evidence is presented of molten material having been produced as part of the plug separation process. C1 USN,CTR SURFACE WEAP,SILVER SPRING,MD 20910. UNIV MARYLAND,COLL PK,MD 20742. RP HOLT, WH (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN,VA 22448, USA. NR 23 TC 17 Z9 18 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 APR 15 PY 1993 VL 73 IS 8 BP 3753 EP 3759 DI 10.1063/1.354053 PG 7 WC Physics, Applied SC Physics GA KY567 UT WOS:A1993KY56700023 ER PT J AU NGAI, KL AF NGAI, KL TI DIFFERENCE BETWEEN NUCLEAR-SPIN RELAXATION AND IONIC-CONDUCTIVITY RELAXATION IN SUPERIONIC GLASSES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID AMORPHOUS POLYMERS; OXIDE GLASSES; MODEL; CONDUCTORS; DIFFUSION; MOTION; EXPLANATION; DYNAMICS AB Tatsumisago, Angell, and Martin [J. Chem. Phys. 97, 6968 (1992)] have compared conductivity relaxation data and Li-7 nuclear spin lattice relaxation (SLR) data measured on a lithium chloroborate glass and found pronounced differences in the most probable relaxation times. The electrical conductivity relaxation (ECR) time, tau(sigma)*, at some temperature occurs on a time scale shorter by some two orders of magnitude than the Li-7 spin lattice relaxation correlation time, tau(s)*, and has a significantly lower activation energy. SLR and ECR monitor the motions of ions through different dynamic variables and correlation functions. Using this fact and the coupling model, I am able to explain quantitatively all aspects of the difference between SLR and ECR, and to establish relations between their different relaxation characteristics. The large difference between the observed activation energies of SLR and ECR alone should have implications on the validity of any proposed theory of the dynamics of ionic transport. RP NGAI, KL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 49 TC 69 Z9 69 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 APR 15 PY 1993 VL 98 IS 8 BP 6424 EP 6430 DI 10.1063/1.464806 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KX946 UT WOS:A1993KX94600046 ER PT J AU PLAZEK, DJ SCHLOSSER, E SCHONHALS, A NGAI, KL AF PLAZEK, DJ SCHLOSSER, E SCHONHALS, A NGAI, KL TI BREAKDOWN OF THE ROUSE MODEL FOR POLYMERS NEAR THE GLASS-TRANSITION TEMPERATURE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID POLY(PHENYLMETHYL SILOXANE); CONCENTRATION FLUCTUATIONS; DEPENDENCES; DENSITY AB The bead-spring model pioneered by Rouse is generally considered to be the basis of polymer physics. We show generally that it breaks down dramatically near the glass transition temperature by shear creep measurements on several polymers with very different backbone structures. The physical origin of this breakdown is traced to the segmental relaxation time having a much stronger temperature dependence than that of the Rouse spectrum. This property, a consequence of the cooperative nature of segmental relaxation in dense packed polymers, was predicted before by a coupling model. We verify this property directly by dielectric relaxation measurements with a wide frequency window of ten decades. C1 ZENTRUM MAKROMOLEK CHEM,O-1199 BERLIN,GERMANY. USN,RES LAB,WASHINGTON,DC 20375. RP PLAZEK, DJ (reprint author), UNIV PITTSBURGH,DEPT MAT SCI & ENGN,PITTSBURGH,PA 15261, USA. RI Schoenhals, Andreas/E-4194-2010 NR 21 TC 56 Z9 56 U1 1 U2 9 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 APR 15 PY 1993 VL 98 IS 8 BP 6488 EP 6491 DI 10.1063/1.464788 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KX946 UT WOS:A1993KX94600054 ER PT J AU MILGRAM, JH PELTZER, RD GRIFFIN, OM AF MILGRAM, JH PELTZER, RD GRIFFIN, OM TI SUPPRESSION OF SHORT SEA WAVES IN SHIP WAKES - MEASUREMENTS AND OBSERVATIONS SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article AB Measurements of short wave energy, surface tension distributions, and radar imagery of centerline ship wakes are presented. A direct association between reduced radar return and reduced scattering wave energy is demonstrated. The dominant influences of ship-generated turbulence and surface film distributions upon reduced short wave energy in ship wakes are shown. The effect of turbulence is emphasized by the very slow regrowth of attenuated wave energy in the especially turbulent wake of a towed barge. The effect of surface film distributions is emphasized by the suppression of short wave growth during a wind puff in a wake that is about 1 hour old. C1 USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. RP MILGRAM, JH (reprint author), MIT,DEPT OCEAN ENGN,CAMBRIDGE,MA 02139, USA. NR 8 TC 15 Z9 15 U1 1 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD APR 15 PY 1993 VL 98 IS C4 BP 7103 EP 7114 DI 10.1029/92JC02612 PG 12 WC Oceanography SC Oceanography GA KY384 UT WOS:A1993KY38400019 ER PT J AU MILGRAM, JH SKOP, RA PELTZER, RD GRIFFIN, OM AF MILGRAM, JH SKOP, RA PELTZER, RD GRIFFIN, OM TI MODELING SHORT SEA WAVE ENERGY-DISTRIBUTIONS IN THE FAR WAKES OF SHIPS SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID SURFACE-FILMS; GRAVITY-WAVES; WIND AB A mathematical model based on the spectral energy balance equation for suppression of short-wave wave energy in centerline ship wakes is developed. At distances behind a ship of more than a few ship lengths, the dominant influences on short wave energy are the growing effects of wind and nonlinear energy transfer from longer waves, and the attenuating effects of turbulence and viscous attenuation which can be greatly enhanced by surface film distributions which are modified by passage of the ship. These influences are modeled as ''source terms'' in the energy balance equation. The model is exercised using turbulence data from scale model experiments and surface film distributions measured in an actual ship wake. Agreement between the resulting distribution of Bragg-scattering wave energy and radar image intensity in the far wake is excellent. The influences of variations in the source term model parameters are explored numerically. C1 USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. UNIV MIAMI,ROSENSTIEL SCH MARINE & ATMOSPHER SCI,DIV APPL MARINE PHYS,MIAMI,FL 33149. RP MILGRAM, JH (reprint author), MIT,DEPT OCEAN ENGN,CAMBRIDGE,MA 02139, USA. NR 23 TC 16 Z9 17 U1 0 U2 7 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD APR 15 PY 1993 VL 98 IS C4 BP 7115 EP 7124 DI 10.1029/92JC02611 PG 10 WC Oceanography SC Oceanography GA KY384 UT WOS:A1993KY38400020 ER PT J AU AHUJA, SS PALIOGIANNI, F YAMADA, H BALOW, JE BOUMPAS, DT AF AHUJA, SS PALIOGIANNI, F YAMADA, H BALOW, JE BOUMPAS, DT TI EFFECT OF TRANSFORMING GROWTH-FACTOR-BETA ON EARLY AND LATE ACTIVATION EVENTS IN HUMAN T-CELLS SO JOURNAL OF IMMUNOLOGY LA English DT Article ID RETINOBLASTOMA SUSCEPTIBILITY GENE; TYROSINE PHOSPHORYLATION; INTERLEUKIN-2 RECEPTOR; LYMPHOCYTES-T; TGF-BETA; EXPRESSION; PROTEIN; CYCLE; PROLIFERATION; GENERATION AB Transforming growth factors-beta (TGF-beta) modulate immune responses by inhibiting the proliferation of normal T lymphocytes. To examine the mechanism(s) of this inhibition, we studied the effect of TGF-beta1 on selected events associated with the initiation and progression of the T lymphocyte cell cycle. Human peripheral blood T cells were stimulated with anti-CD3 mAb, PHA, PMA, or ionomycin, alone or in combination. TGF-beta1 (0.5 to 10 ng/ml) partially inhibited the tyrosine phosphorylation of a 100-kDa protein, but not the calcium influx when cells were stimulated via TCR. Nuclear transcription of early activation genes (c-fos, c-jun, and c-myc) as determined by nuclear run-off assays, and steady state mRNA levels and/or protein products of intermediate activation genes (IL-2, IL-2Ralpha, IL-2Rbeta, and transferrin receptor) were not affected by TGF-beta1. Total cellular RNA synthesis and cell size after T cell stimulation were also not affected by TGF-beta1. However, TGF-beta1 inhibited the IL-2-dependent proliferation of Con A lymphoblasts by -50%. This inhibition was associated with the down-regulation of IL-2-mediated tyrosine phosphorylation of proteins of 120, 100, 85, 75, and 50 kDa. TGF-beta1 also inhibited the IL-2-dependent phosphorylation of the retinoblastoma susceptibility gene product, which plays an important role in cell cycle progression. These results suggest that TGF-beta1 inhibits T cell proliferation by down-regulating predominantly IL-2-mediated proliferative signals. C1 USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20889. RP AHUJA, SS (reprint author), NIDDKD,KIDNEY DIS SECT,BLDG 10,ROOM 3N114,BETHESDA,MD 20892, USA. NR 39 TC 145 Z9 148 U1 0 U2 1 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD APR 15 PY 1993 VL 150 IS 8 BP 3109 EP 3118 PN 1 PG 10 WC Immunology SC Immunology GA KX321 UT WOS:A1993KX32100001 PM 8468460 ER PT J AU COOPER, LJN CHAROENVIT, Y HOFFMAN, SL GREENSPAN, NS AF COOPER, LJN CHAROENVIT, Y HOFFMAN, SL GREENSPAN, NS TI HETEROLOGOUS BUT NOT HOMOLOGOUS COOPERATIVE BINDING BY A MOUSE IGG3 ANTIBODY SPECIFIC FOR A MALARIA CIRCUMSPOROZOITE PROTEIN (CSP) SO JOURNAL OF IMMUNOLOGY LA English DT Meeting Abstract C1 CASE WESTERN RESERVE UNIV,CLEVELAND,OH 44106. USN,MED RES INST,BETHESDA,MD 20889. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD APR 15 PY 1993 VL 150 IS 8 BP A234 EP A234 PN 2 PG 1 WC Immunology SC Immunology GA KX956 UT WOS:A1993KX95601348 ER PT J AU RYAN, JJ YAO, H HARTZMAN, RJ FINKELMAN, FD CHURILLA, AM AF RYAN, JJ YAO, H HARTZMAN, RJ FINKELMAN, FD CHURILLA, AM TI MOUSE MAMMARY-TUMOR PROVIRUS (MTV)-POSITIVE PRESENTING CELLS ELICIT A VIGOROUS PRIMARY HUMAN T-CELL RESPONSE SO JOURNAL OF IMMUNOLOGY LA English DT Meeting Abstract C1 USUHS,BETHESDA,MD 20814. USN,MED RES INST,BETHESDA,MD 20889. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD APR 15 PY 1993 VL 150 IS 8 BP A269 EP A269 PN 2 PG 1 WC Immunology SC Immunology GA KX956 UT WOS:A1993KX95601547 ER PT J AU SELVEY, LA MORSE, HC JUNE, CH HODES, RJ AF SELVEY, LA MORSE, HC JUNE, CH HODES, RJ TI SPLENIC B-CELLS FROM MAIDS MICE SHOW A SELECTIVE DEFECT IN TYROSINE PHOSPHORYLATION IN RESPONSE TO IGM CROSS-LINKING SO JOURNAL OF IMMUNOLOGY LA English DT Meeting Abstract C1 NCI,BETHESDA,MD 20892. NIAID,PATHOL LAB,BETHESDA,MD 20892. USN,MED RES INST,BETHESDA,MD 20814. RI Selvey, Linda/B-8473-2017 OI Selvey, Linda/0000-0001-8493-0974 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD APR 15 PY 1993 VL 150 IS 8 BP A265 EP A265 PN 2 PG 1 WC Immunology SC Immunology GA KX956 UT WOS:A1993KX95601522 ER PT J AU CAMPBELL, ML AF CAMPBELL, ML TI KINETIC-STUDY OF THE MG(S-1) REACTION WITH CL-2(1-SIGMA-G+) IN THE TEMPERATURE-RANGE FROM 300 TO 900-K SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Note RP CAMPBELL, ML (reprint author), USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402, USA. NR 9 TC 2 Z9 2 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD APR 15 PY 1993 VL 97 IS 15 BP 3922 EP 3923 DI 10.1021/j100117a045 PG 2 WC Chemistry, Physical SC Chemistry GA KX596 UT WOS:A1993KX59600045 ER PT J AU ABRAHAM, KM PASQUARIELLO, DM ALAMGIR, M KILROY, WP AF ABRAHAM, KM PASQUARIELLO, DM ALAMGIR, M KILROY, WP TI POLYMER ELECTROLYTE COATINGS FOR LITHIUM ANODES IN SOCL2 CELLS SO JOURNAL OF POWER SOURCES LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL MEETING ON LITHIUM BATTERIES CY MAY 10-15, 1992 CL MUNSTER, GERMANY AB Polymer electrolytes based on poly[bis-((methoxyethoxy)ethoxy) phosphazene] (MEEP) or its composites with poly(ethylene oxide) (PEO) or poly[(ethylene glycol)diacrylates)] (PEGDA) have been investigated as coatings on the lithium anode to alleviate the voltage delay of Li/SOCl2 cells. Cells with the polymer electrolyte-coated anodes exhibited significantly lower voltage delays and better capacity retention when discharged after two weeks of storage at 70-degrees-C. C1 USN,CTR SURFACE WARFARE,DIV MAT,SILVER SPRING,MA 20903. RP ABRAHAM, KM (reprint author), EIC LABS INC,NORWOOD,MA 02062, USA. NR 4 TC 2 Z9 3 U1 1 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0378-7753 J9 J POWER SOURCES JI J. Power Sources PD APR 15 PY 1993 VL 44 IS 1-3 BP 385 EP 390 DI 10.1016/0378-7753(93)80178-R PG 6 WC Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Energy & Fuels; Materials Science GA LH764 UT WOS:A1993LH76400006 ER PT J AU KILROY, WP SCHLAIKJER, C POLSONETTI, P JONES, M AF KILROY, WP SCHLAIKJER, C POLSONETTI, P JONES, M TI OPTIMIZED LITHIUM OXYHALIDE CELLS SO JOURNAL OF POWER SOURCES LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL MEETING ON LITHIUM BATTERIES CY MAY 10-15, 1992 CL MUNSTER, GERMANY ID BATTERIES AB Lithium thionyl chloride cells were optimized with respect to electrolyte and carbon cathode composition. Wound 'C-size' cells with various mixtures of Chevron acetylene black with Ketjenblack EC-300J and containing various concentrations of LiAlCl4 and derivatives, LiGaCl4, and mixtures Of SOCl2 and SO2Cl2 were evaluated as a function of discharge rate, temperature, and storage condition. C1 BATTERY ENGN INC,HYDE PK,MA 02136. RP KILROY, WP (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,WHITE OAK DETACHMENT,SILVER SPRING,MD 20903, USA. NR 9 TC 0 Z9 0 U1 2 U2 10 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0378-7753 J9 J POWER SOURCES JI J. Power Sources PD APR 15 PY 1993 VL 44 IS 1-3 BP 715 EP 723 DI 10.1016/0378-7753(93)80223-C PG 9 WC Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Energy & Fuels; Materials Science GA LH764 UT WOS:A1993LH76400051 ER PT J AU LAW, CT SWARTZLANDER, GA AF LAW, CT SWARTZLANDER, GA TI OPTICAL VORTEX SOLITONS AND THE STABILITY OF DARK SOLITON STRIPES SO OPTICS LETTERS LA English DT Article ID FIBERS; PULSES AB Dark soliton stripes are robust but can decay into optical vortex solitons when subjected to a persistent, long-period, transverse modulation. We explore the nonlinear dynamics of this symmetry-breaking process and determine growth rates, vortex densities, and other characteristics by conducting a nonlinear stability analysis that uses numerical techniques for several cases of special interest. C1 USN,RES LAB,OPT PHYS BRANCH,CODE 5611,WASHINGTON,DC 20375. RP LAW, CT (reprint author), JOHNS HOPKINS UNIV,DEPT ELECT & COMP ENGN,BALTIMORE,MD 21218, USA. OI Swartzlander, Grover/0000-0003-3513-2225 NR 19 TC 70 Z9 70 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD APR 15 PY 1993 VL 18 IS 8 BP 586 EP 588 DI 10.1364/OL.18.000586 PG 3 WC Optics SC Optics GA KX231 UT WOS:A1993KX23100008 PM 19802208 ER PT J AU RYAN, JC REINECKE, TL AF RYAN, JC REINECKE, TL TI BAND-GAP RENORMALIZATION OF OPTICALLY-EXCITED SEMICONDUCTOR QUANTUM-WELLS SO PHYSICAL REVIEW B LA English DT Article ID ELECTRON-HOLE LIQUID; SYSTEMS AB The band-gap renormalization of optically excited semiconductor quantum wells due to exchange-correlation effects in the electron-hole system is studied here. The first-order self-energies for this two-component electron-hole plasma are calculated exactly within the random-phase approximation. All intersubband interactions are included fully, and they are found to make significant contributions to the self-energies and to their subband dependences. Particular attention is paid to the subband dependence of the band-gap renormalization. These calculations are made for realistic systems with finite well widths, finite barrier heights, and finite temperatures. The results are compared with recent experimental data for InxGa1-xAs/InP and GaAs/Ga1-xAlxAs quantum wells. RP RYAN, JC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 TC 49 Z9 49 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 15 PY 1993 VL 47 IS 15 BP 9615 EP 9620 DI 10.1103/PhysRevB.47.9615 PG 6 WC Physics, Condensed Matter SC Physics GA KZ508 UT WOS:A1993KZ50800050 ER PT J AU BROZAK, G SHANABROOK, BV GAMMON, D KATZER, DS AF BROZAK, G SHANABROOK, BV GAMMON, D KATZER, DS TI COLLECTIVE INTERSUBBAND SPIN-DENSITY AND CHARGE-DENSITY EXCITATIONS IN TILTED MAGNETIC-FIELDS SO PHYSICAL REVIEW B LA English DT Note ID QUANTUM-WELL; RESONANCES; EXCHANGE; GAAS AB Collective intersubband excitations, from the ground to the first excited electronic subband, are studied via inelastic light scattering in modulation-doped GaAs/AlxGa1-xAs quantum wells. The application of a magnetic field, tilted with respect to the growth direction, allows coupling of electron motion in the plane of the quantum well to motion along the growth axis such that combined intersubband-cyclotron-resonance transitions are observed. Anticrossing behavior between the combined resonances and the collective charge- or spin-density excitations is exhibited in the polarized or depolarized Raman-scattering geometries, respectively. The combined resonances show weak collective effects allowing an extrapolation of the bare subband separation and hence measurements of the depolarization and exchange-correlation shifts. Comparison to a theory employing the local-density approximation yields excellent results. RP BROZAK, G (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. RI Katzer, D. Scott/N-7841-2013 NR 15 TC 21 Z9 21 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD APR 15 PY 1993 VL 47 IS 15 BP 9981 EP 9984 DI 10.1103/PhysRevB.47.9981 PG 4 WC Physics, Condensed Matter SC Physics GA KZ508 UT WOS:A1993KZ50800111 ER PT J AU HEMSTREET, LA CHUBB, SR AF HEMSTREET, LA CHUBB, SR TI ELECTRONIC-STRUCTURE OF C(2X2) BA ADSORBED ON W(001) SO PHYSICAL REVIEW B LA English DT Article ID TRANSITION-METAL SURFACES; ADSORPTION; CS AB We have used the ab initio full-potential linearized-plane-wave method to investigate the electronic properties of a c (2 X 2) overlayer of barium adsorbed onto a W(001) surface. We have determined the equilibrium height of the barium overlayer to be 2.48 angstrom above the tungsten surface by minimizing the total energy of the Ba/W(001) film. We calculate that the work function of the tungsten substrate (4.66 eV) is lowered by approximately 1.9 eV by the adsorption of the barium overlayer, a result which is in excellent agreement with experiment. We find that the Ba atoms are not ionized but rather form a metallic-covalent layer. In contrast to earlier studies of cesium adsorption on W(001) and Mo(001) surfaces, we find a very strong covalent component to the bonding between the tungsten substrate and the barium adsorbates. We find that the dominant substrate-adsorbate interaction involves the d states of the Ba adsorbates and the d-like surface states of the tungsten substrate. The Ba s states play only a minor role in this interaction and the bonding appears to be much more covalent than polar metallic. The work-function lowering is explained by multiple surface dipoles resulting from the interaction of the valence electrons of the adsorbate and the localized d-like surface states near the Fermi level of the tungsten substrate, and from the interaction of the 5p semicore states of the adsorbate overlayer with the s-like states at the bottom of the tungsten conduction band. The strong covalent contribution to the Ba-W bond is suggested as a reason to explain why Ba adsorption is not as effective as Cs in lowering the work function of the tungsten substrate and why Ba films are more stable than their cesium counterparts. RP HEMSTREET, LA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 15 PY 1993 VL 47 IS 16 BP 10748 EP 10753 DI 10.1103/PhysRevB.47.10748 PG 6 WC Physics, Condensed Matter SC Physics GA LA298 UT WOS:A1993LA29800082 ER PT J AU BILODEAU, TG DOVERSPIKE, K STROM, U FREITAS, JA RAMESHAN, R AF BILODEAU, TG DOVERSPIKE, K STROM, U FREITAS, JA RAMESHAN, R TI CALORIMETRIC ABSORPTION-SPECTROSCOPY AND PHOTOLUMINESCENCE STUDY OF DEFECTS IN DIAMOND SO DIAMOND AND RELATED MATERIALS LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON THE NEW DIAMOND SCIENCE AND TECHNOLOGY ( ICNDST-3 ) / 3RD EUROPEAN CONF ON DIAMOND, DIAMOND-LIKE AND RELATED COATINGS ( DF 92 ) CY AUG 31-SEP 04, 1992 CL HEIDELBERG, GERMANY ID CHEMICAL-VAPOR-DEPOSITION; POLYCRYSTALLINE DIAMOND; FILMS; CATHODOLUMINESCENCE; VACANCY; CENTERS AB Defects in diamond, both plasma-assisted chemical vapor deposition grown polycrystalline and electron-irradiated type IIa natural diamond, were studied using calorimetric absorption spectroscopy and photoluminescence. Calorimetric absorption spectroscopy is a highly sensitive low temperature technique which measures the non-radiative recombination component of a given optical absorption. For the first time calorimetric absorption spectroscopy has been used to investigate a wide band gap crystalline material, namely diamond. The radiative efficiency of the 1.68 and 1.639 eV absorption in plasma assisted chemical vapor deposition diamond grown on silicon and the 1.673 eV absorption in electron irradiated natural diamond have been studied using a combination of calorimetric absorption spectroscopy and photoluminescence measurements. The radiative efficiency of the 1.68 eV absorption is found to be much greater than that of the 1.639 eV absorption. Also, the 1.673 eV neutral vacancy absorption in irradiated bulk diamond is seen to have a highly non-radiative recombination character. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. AUBURN UNIV,DEPT ELECT ENGN,AUBURN,AL 36849. RP BILODEAU, TG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 6 Z9 6 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-9635 J9 DIAM RELAT MATER JI Diam. Relat. Mat. PD APR 13 PY 1993 VL 2 IS 5-7 BP 699 EP 703 DI 10.1016/0925-9635(93)90206-H PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA LE793 UT WOS:A1993LE79300017 ER PT J AU SPIBERG, P WOODIN, RL BUTLER, JE DHAR, L AF SPIBERG, P WOODIN, RL BUTLER, JE DHAR, L TI INSITU FOURIER-TRANSFORM IR EMISSION-SPECTROSCOPY OF DIAMOND CHEMICAL-VAPOR-DEPOSITION SO DIAMOND AND RELATED MATERIALS LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON THE NEW DIAMOND SCIENCE AND TECHNOLOGY ( ICNDST-3 ) / 3RD EUROPEAN CONF ON DIAMOND, DIAMOND-LIKE AND RELATED COATINGS ( DF 92 ) CY AUG 31-SEP 04, 1992 CL HEIDELBERG, GERMANY AB Characterization of diamond film during chemical vapor deposition provides new understanding of the deposition process. The mid-IR spectral region contains detailed information on molecular vibrations and hence the chemical structures present in the polycrystalline film. Using Fourier transform IR spectroscopy to study the radiation emitted by externally heated diamond films, we detect both the two-phonon transitions around 2200 cm-1 and the presence of sp3 C-H vibrations near 2800 cm-1. Measurements are conducted with samples of different qualities and the signals from both the two-phonon transition and the C-H emission are correlated with the diamond thermal conductivity. These two signals are then measured in situ during deposition in a d.c. plasma jet reactor. Their evolution is monitored as a function of film growth and process parameters, again correlating with film quality. The technique is then evaluated as an on-line quality-monitoring tool. C1 USN,RES LAB,DIV CHEM,CODE 6174,WASHINGTON,DC 20375. MIT,DEPT CHEM,CAMBRIDGE,MA 02139. RP SPIBERG, P (reprint author), NORTON DIAMOND FILM,GODDARD RD,NORTHBOROUGH,MA 01532, USA. RI Butler, James/B-7965-2008 OI Butler, James/0000-0002-4794-7176 NR 10 TC 3 Z9 3 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-9635 J9 DIAM RELAT MATER JI Diam. Relat. Mat. PD APR 13 PY 1993 VL 2 IS 5-7 BP 708 EP 712 DI 10.1016/0925-9635(93)90208-J PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA LE793 UT WOS:A1993LE79300019 ER PT J AU BINARI, SC MARCHYWKA, M KOOLBECK, DA DIETRICH, HB MOSES, D AF BINARI, SC MARCHYWKA, M KOOLBECK, DA DIETRICH, HB MOSES, D TI DIAMOND METAL-SEMICONDUCTOR-METAL ULTRAVIOLET PHOTODETECTORS SO DIAMOND AND RELATED MATERIALS LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON THE NEW DIAMOND SCIENCE AND TECHNOLOGY ( ICNDST-3 ) / 3RD EUROPEAN CONF ON DIAMOND, DIAMOND-LIKE AND RELATED COATINGS ( DF 92 ) CY AUG 31-SEP 04, 1992 CL HEIDELBERG, GERMANY AB Metal-semiconductor-metal photodetectors have been fabricated in natural, synthetic, and polycrystalline insulating diamonds. The detectors were characterized over a wavelength range of 130-700 nm. Low dark currents of 10(-12) A were observed. Of the materials investigated, natural diamond demonstrated the highest quantum efficiency of 39% at a wavelength of 200 nm and a factor of 10(3) lower response to visible light. RP BINARI, SC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 TC 54 Z9 54 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-9635 J9 DIAM RELAT MATER JI Diam. Relat. Mat. PD APR 13 PY 1993 VL 2 IS 5-7 BP 1020 EP 1023 DI 10.1016/0925-9635(93)90267-6 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA LE793 UT WOS:A1993LE79300078 ER PT J AU DOVERSPIKE, K BUTLER, JE FREITAS, JA AF DOVERSPIKE, K BUTLER, JE FREITAS, JA TI AEROSOL DOPING OF FLAME-GROWN DIAMOND FILMS SO DIAMOND AND RELATED MATERIALS LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON THE NEW DIAMOND SCIENCE AND TECHNOLOGY ( ICNDST-3 ) / 3RD EUROPEAN CONF ON DIAMOND, DIAMOND-LIKE AND RELATED COATINGS ( DF 92 ) CY AUG 31-SEP 04, 1992 CL HEIDELBERG, GERMANY ID OXYGEN-ACETYLENE FLAME; VAPOR-DEPOSITION; CRYSTALS AB Diamond films have been deposited using a pre-mixed oxy-acetylene flame onto cooled substrates. Doping of these flame-grown diamond films was achieved by introducing aerosol droplets containing the dopant species into the gas flow. The aerosol was generated by a commercial atomizer and was entrained into the oxygen flow before the flame front leading to a uniform and reproducible flame. Micro-Raman measurements show a decrease in the background fluorescence of the boron-doped films as compared with samples containing other dopants. In addition, low-temperature photoluminescence measurements of both the boron- and silicon-doped films show a significant decrease in the defect bands associated with nitrogen vacancy complexes that are often observed in flame-grown diamond films. The boron-doped diamond samples were also characterized by photoluminescence using the UV 351 nm laser line of an argon ion laser and show both green and/or blue emission. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. RP DOVERSPIKE, K (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Butler, James/B-7965-2008 OI Butler, James/0000-0002-4794-7176 NR 27 TC 5 Z9 5 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-9635 J9 DIAM RELAT MATER JI Diam. Relat. Mat. PD APR 13 PY 1993 VL 2 IS 5-7 BP 1078 EP 1082 DI 10.1016/0925-9635(93)90276-8 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA LE793 UT WOS:A1993LE79300087 ER PT J AU CARROLL, KR POND, JM CHRISEY, DB HORWITZ, JS LEUCHTNER, RE GRABOWSKI, KS AF CARROLL, KR POND, JM CHRISEY, DB HORWITZ, JS LEUCHTNER, RE GRABOWSKI, KS TI MICROWAVE MEASUREMENT OF THE DIELECTRIC-CONSTANT OF SR0.5BA0.5TIO3 FERROELECTRIC THIN-FILMS SO APPLIED PHYSICS LETTERS LA English DT Article ID PULSED LASER DEPOSITION AB Measurement of the relative dielectric constant of a Sr0.5Ba0.5TiO3 (SBT) thin film is presented as a function of electric field strength and temperature over a broad frequency range using a microstrip transmission line. The transmission line was fabricated from a trilayer structure where the SBT film, grown by pulsed laser deposition, was bounded by silver and platinum metallization layers. Such structures involving ferroelectric films could be useful for microwave applications because of the substantially smaller bias voltages (almost-equal-to 1-10 V) compared to those required for bulk material. The SBT film was found to exhibit a dielectric constant of almost-equal-to 120-250 and a large electric field modulation of almost-equal-to 50% at 200 kV/cm. These properties of the material as well as the Curie temperature are compared to those of bulk SBT. RP CARROLL, KR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. OI Grabowski, Kenneth/0000-0003-0816-001X NR 15 TC 82 Z9 82 U1 3 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 APR 12 PY 1993 VL 62 IS 15 BP 1845 EP 1847 DI 10.1063/1.109522 PG 3 WC Physics, Applied SC Physics GA KW464 UT WOS:A1993KW46400047 ER PT J AU GORHAM, ED GARLAND, FC MAYERS, DL GOFORTH, RR BRODINE, SK WEISS, PJ MCNALLY, MS AF GORHAM, ED GARLAND, FC MAYERS, DL GOFORTH, RR BRODINE, SK WEISS, PJ MCNALLY, MS TI CD4 LYMPHOCYTE COUNTS WITHIN 24 MONTHS OF HUMAN-IMMUNODEFICIENCY-VIRUS SEROCONVERSION - FINDINGS IN THE UNITED-STATES-NAVY AND MARINE-CORPS SO ARCHIVES OF INTERNAL MEDICINE LA English DT Article ID INFECTED HOMOSEXUAL MEN; T-CELL DEPLETION; HIV-INFECTION; SAN-FRANCISCO; NATURAL-HISTORY; SERIAL DETERMINATIONS; RISING TITERS; AIDS; PROGRESSION; COHORT AB Background: Although CD4 lymphocytes are the primary target of the human immunodeficiency virus (HIV), few studies have evaluated CD4 cell counts in a large population of seroconverters with known dates of seroconversion. This study reports an analysis of CD4 lymphocyte counts and CD4 cells as a percentage of all lymphocytes within 24 months of estimated date of HIV seroconversion in 1046 HIV seroconverters. Methods: Study participants included all Navy and Marine Corps seroconverters (1023 men, 23 women) from 1987 through 1991 with a previous negative HIV test. CD4 lymphocyte counts and percentages were obtained for blood drawn from HIV seroconverters during initial clinical evaluations carried out at Naval Medical Centers in Bethesda, Md; Oakland, Calif, Portsmouth, Va; and San Diego, Calif. The seroconversion date was estimated as the midpoint between the last negative test date and the first positive test date. Results: Nearly 40% of seroconverters presented with initial CD4 lymphocyte counts lower than 0.50 X 10(9)/L (500/muL) and 3% with counts lower than 0.20 X 10(9)/L (200/muL). Approximately half the seroconverters presented with fewer than 29% CD4 cells, and 5% presented with fewer than 14% CD4 cells. There were no significant differences in CD4 counts according to sex, race, or estimated duration of HIV infection. Conclusion: Little difference in CD4 lymphocyte counts or percentages by duration of infection within 24 months was evident on initial clinical evaluation of HIV seroconverters. The high percentage of seroconverters presenting with low CD4 counts or percentages suggests a population of seroconverters with rapid depletion of CD4 lymphocytes following seroconversion. C1 USN,MED RES CTR,BETHESDA,MD 20814. UNIV ARKANSAS,DEPT COMP SYST ENGN,FAYETTEVILLE,AR 72701. USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134. RP GORHAM, ED (reprint author), USN,HLTH RES CTR,DEPT HLTH SCI & EPIDEMIOL,DIV EPIDEMIOL,POB 85122,SAN DIEGO,CA 92186, USA. NR 62 TC 22 Z9 22 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0003-9926 J9 ARCH INTERN MED JI Arch. Intern. Med. PD APR 12 PY 1993 VL 153 IS 7 BP 869 EP 876 DI 10.1001/archinte.153.7.869 PG 8 WC Medicine, General & Internal SC General & Internal Medicine GA KW475 UT WOS:A1993KW47500008 PM 8096691 ER PT J AU PERCIVAL, JW BIGGS, JD DOLAN, JF ROBINSON, EL TAYLOR, MJ BLESS, RC ELLIOT, JL NELSON, MJ RAMSEYER, TF VANCITTERS, GW ZHANG, E AF PERCIVAL, JW BIGGS, JD DOLAN, JF ROBINSON, EL TAYLOR, MJ BLESS, RC ELLIOT, JL NELSON, MJ RAMSEYER, TF VANCITTERS, GW ZHANG, E TI THE CRAB PULSAR IN THE VISIBLE AND ULTRAVIOLET WITH 20 MICROSECOND EFFECTIVE TIME RESOLUTION SO ASTROPHYSICAL JOURNAL LA English DT Article DE PULSARS, INDIVIDUAL (CRAB PULSAR); TECHNIQUES, PHOTOMETRIC; ULTRAVIOLET, STARS ID EMISSION; STARS; VELA AB The Crab pulsar (PSR 0531 + 21) was observed with the High Speed Photometer on the Hubble Space Telescope in the visible in 1991 October and in the UV in 1992 January. The time resolution of the instrument was 10.74 mus; the effective time resolution of the light curves folded modulo the pulsar period was 21.5 mus. Contemporaneous UVBR observations were obtained from McDonald Observatory in January. The visible and UV light curves observed from HST are similar, but the main pulse is slightly narrower in the UV. The separation in phase between the main pulse and the interpulse is also 0.7% smaller in the UV than in the visible. The main pulse arrival time is the same in the UV as in the visible and radio to within the accuracy of the establishment of the spacecraft clock, +/- 1.05 ms (+/- 0.031 in pulsar phase). The peak of the main pulse is resolved in time. Corrected for reddening, the intensity spectral index of the Crab pulsar from 1680 to 7400 angstrom is alpha = 0.11 +/- 0.13. The pulsed flux has an intensity less than 0.9% of the peak flux (2 sigma upper limit) just before the onset of the main pulse. The variations in intensity of individual main and secondary pulses are uncorrelated, even within the same rotational period. These results are consistent with the predictions of the standard model of pulsar emission. C1 NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771. NASA,GODDARD SPACE FLIGHT CTR,UNIV SPACE RES ASSOC,GREENBELT,MD 20771. UNIV TEXAS,DEPT ASTRON,AUSTIN,TX 78712. UNIV WISCONSIN,DEPT ASTRON,MADISON,WI 53706. MIT,DEPT EARTH & PLANETARY SCI,CAMBRIDGE,MA 02139. NATL SCI FDN,DIV ASTRON SCI,WASHINGTON,DC 20550. USN ACAD,DEPT AEROSP ENGN,ANNAPOLIS,MD 21402. RP PERCIVAL, JW (reprint author), UNIV WISCONSIN,SPACE ASTRON LAB,MADISON,WI 53706, USA. NR 24 TC 83 Z9 83 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD APR 10 PY 1993 VL 407 IS 1 BP 276 EP & DI 10.1086/172512 PN 1 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KV285 UT WOS:A1993KV28500027 ER PT J AU MAY, DA AF MAY, DA TI SEA-SURFACE TEMPERATURE ESTIMATION FROM THE DMSP OPERATIONAL LINESCAN SYSTEM USING A SSM I-DERIVED WATER-VAPOR CORRECTION SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article AB Atmospheric correction algorithms for Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS) single channel infrared (IR) estimation of sea surface temperature (SST) have been derived based on Special Sensor Microwave/Imager (SSM/I) water vapor (WV) content retrievals. It is demonstrated that the OLS single IR channel atmospheric correction can be correlated to WV and that the SSM/I-derived correction algorithms provide significant improvement over uncorrected single IR channel SST estimation. Best results are obtained from a correction algorithm that incorporates a quadratic WV term. Use of the quadratic SSM/I-derived WV correction on properly cloud screened OLS IR data produces SST retrievals accurate to within 1.0-degrees-C RMS when compared to moored buoy in situ SST measurements. RP MAY, DA (reprint author), USN,RES LAB,REMOTE SENSING APPLICAT BRANCH,BAY ST LOUIS,MS 39529, USA. NR 12 TC 1 Z9 1 U1 0 U2 2 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 APR 9 PY 1993 VL 20 IS 7 BP 583 EP 586 DI 10.1029/93GL00048 PG 4 WC Geosciences, Multidisciplinary SC Geology GA KY310 UT WOS:A1993KY31000011 ER PT J AU BONE, WD NEWTON, JA OLDFIELD, EC AF BONE, WD NEWTON, JA OLDFIELD, EC TI MALARIA IMPORTED FROM SOMALIA SO NEW ENGLAND JOURNAL OF MEDICINE LA English DT Letter RP BONE, WD (reprint author), USN HOSP,SAN DIEGO,CA 92134, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU MASS MEDICAL SOC PI BOSTON PA 10 SHATTUCK, BOSTON, MA 02115 SN 0028-4793 J9 NEW ENGL J MED JI N. Engl. J. Med. PD APR 8 PY 1993 VL 328 IS 14 BP 1046 EP 1047 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA KW282 UT WOS:A1993KW28200035 PM 8450870 ER PT J AU BALL, DW PONG, RGS KAFAFI, ZH AF BALL, DW PONG, RGS KAFAFI, ZH TI REACTIONS OF ATOMIC AND DIATOMIC IRON WITH ALLENE IN SOLID ARGON SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID MATRIX-ISOLATION; C3H4 SURFACE; SHOCK-WAVES; CRYOGENIC MATRICES; DIIRON COMPLEX; FTIR SPECTRUM; ISOMERIZATION; PROPYNE; ACETYLENE; ABINITIO AB The activation of the C-H bond of allene or propadiene by ground-state atomic iron has been observed in solid argon at 10 K. The new matrix-isolated product, propadienyliron hydride, was characterized via FTIR spectroscopy. The photochemistry of the metal atom and allene was studied and revealed the isomerization of allene into propyne via the formation of the sigma-bonded iron propyne complex Fe(HC=CCH3). The latter underwent interestings and rich photochemistry (which will be treated in greater detail in a future publication) with the activation of the methyl and acetylenic C-H bonds as well as the C-C single bond of HC=CCH3. In contrast, diatomic iron exhibited different reactivity toward allene, with the formation of pi-complexes that did not photorearrange to a C-H-activated product. Evidence based on FTIR spectroscopy indicates that diatomic iron is simultaneously bonded to the two pi-bonds of allene, forcing the latter into a V-shaped structure for Fe2(H2C=C-H-2). Isotopic studies with D2C=C=CD2 support these findings. C1 USN,RES LAB,WASHINGTON,DC 20375. CLEVELAND STATE UNIV,DEPT CHEM,CLEVELAND,OH 44115. NR 52 TC 22 Z9 22 U1 0 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD APR 7 PY 1993 VL 115 IS 7 BP 2864 EP 2870 DI 10.1021/ja00060a038 PG 7 WC Chemistry, Multidisciplinary SC Chemistry GA KW980 UT WOS:A1993KW98000038 ER PT J AU HONEYCHUCK, RV CRUGER, TW MILLIKEN, J AF HONEYCHUCK, RV CRUGER, TW MILLIKEN, J TI MOLECULAR-WEIGHT OF C-60 IN SOLUTION BY VAPOR-PRESSURE OSMOMETRY SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID FULLERENES; C70; CARBON C1 GEORGE MASON UNIV,DEPT CHEM,FAIRFAX,VA 22030. RP HONEYCHUCK, RV (reprint author), USN,DIV CHEM,WASHINGTON,DC 20375, USA. NR 24 TC 29 Z9 29 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 APR 7 PY 1993 VL 115 IS 7 BP 3034 EP 3035 DI 10.1021/ja00060a085 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA KW980 UT WOS:A1993KW98000085 ER PT J AU DESISTO, WJ NEWMAN, HS HENRY, RL CESTONE, VC AF DESISTO, WJ NEWMAN, HS HENRY, RL CESTONE, VC TI METALORGANIC CHEMICAL VAPOR-DEPOSITION OF DOUBLE-SIDED YBA2CU3O7 THIN-FILMS SO APPLIED PHYSICS LETTERS LA English DT Article AB Thin films of YBa2Cu3O7-delta were deposited on both sides of (100) LaAlO3 substrates by metalorganic chemical vapor deposition. Using a gold-coated wafer carrier, improvements in both the transition temperature and critical current density of the film exposed to the carrier (first side) were demonstrated. T(c)'s of 86-88 K and J(c)'s > 10(6) A/cm2 at 77 K were achieved. The microwave surface resistance of both sides of double-sided samples measured at 77 K was approximately 8 mOMEGA at 36 GHz, scaling to less than 700 muOMEGA at 10 GHz. RP DESISTO, WJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 5 TC 8 Z9 8 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD APR 5 PY 1993 VL 62 IS 14 BP 1682 EP 1684 DI 10.1063/1.109575 PG 3 WC Physics, Applied SC Physics GA KV995 UT WOS:A1993KV99500036 ER PT J AU DUBBELDAY, WB SZAFLARSKI, DM SHIMABUKURO, RL RUSSELL, SD SAILOR, MJ AF DUBBELDAY, WB SZAFLARSKI, DM SHIMABUKURO, RL RUSSELL, SD SAILOR, MJ TI PHOTOLUMINESCENT THIN-FILM POROUS SILICON ON SAPPHIRE SO APPLIED PHYSICS LETTERS LA English DT Article ID LIGHT-EMISSION AB Results from the chemical stain etch fabrication and analysis of thin-film photoluminescent porous silicon on sapphire substrates are presented. The transparent sapphire substrate allows the excitation and collection of the luminescence at either the front or back of the wafer. Morphological differences found using scanning electron microscopy between porous SOS and porous bulk silicon are attributed to preferential etching of threading dislocations. This is confirmed by an observed stress relaxation in the Raman spectra. Also, it is shown for the first time that photoluminescent porous silicon (n-type) can be produced by photoinitiation of the chemical stain etch. C1 UNIV CALIF SAN DIEGO,DEPT CHEM,LA JOLLA,CA 92093. RP DUBBELDAY, WB (reprint author), USN,CTR CONTROL & OCEAN SURVEILLANCE,DIV RDT & E,SAN DIEGO,CA 92152, USA. NR 16 TC 22 Z9 22 U1 1 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 APR 5 PY 1993 VL 62 IS 14 BP 1694 EP 1696 DI 10.1063/1.109641 PG 3 WC Physics, Applied SC Physics GA KV995 UT WOS:A1993KV99500040 ER PT J AU WEETALL, HH ROBERTSON, B CULLIN, D BROWN, J WALCH, M AF WEETALL, HH ROBERTSON, B CULLIN, D BROWN, J WALCH, M TI BACTERIORHODOPSIN IMMOBILIZED IN SOL-GEL GLASS SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Note DE BACTERIORHODOPSIN; MUTANT; PROTEIN ENCAPSULATION; (H-HALOBIUM) ID RHODOPSIN; FILMS AB The 96N mutant of bacteriorhodopsin (BR) has been successfully entrapped in a sol-gel glass. The protein retains it light-sensitive properties when immobilized at pH 9.0. Spectroscopic studies on the immobilized BR shows properties similar to the those observed when in suspension. C1 USN,CTR SURFACE WARFARE,DAHLGREN,VA 22448. USN,CTR SURFACE WARFARE,DAHLGREN DIV,SILVER SPRING,MD 20910. CTR MARINE BIOTECHNOL,BALTIMORE,MD. RP WEETALL, HH (reprint author), NATL INST STAND & TECHNOL,DIV BIOTECHNOL,GAITHERSBURG,MD 20899, USA. NR 15 TC 47 Z9 47 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0006-3002 J9 BIOCHIM BIOPHYS ACTA PD APR 5 PY 1993 VL 1142 IS 1-2 BP 211 EP 213 DI 10.1016/0005-2728(93)90105-O PG 3 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA KW775 UT WOS:A1993KW77500029 ER PT J AU BRENNER, DW ROBERTSON, DH ELERT, ML WHITE, CT AF BRENNER, DW ROBERTSON, DH ELERT, ML WHITE, CT TI DETONATIONS AT NANOMETER RESOLUTION USING MOLECULAR-DYNAMICS SO PHYSICAL REVIEW LETTERS LA English DT Article ID SHOCK-INDUCED DETONATIONS; SIMULATIONS; MODEL; EQUILIBRIUM; SURFACE; SOLIDS; ENERGY AB We show that discrete detonation chemistry can be studied using molecular dynamics simulations. A model 2D semi-infinite energetic molecular solid described by reactive many-body potentials is shown to support a chemically sustained shock wave with properties that are consistent with experimental results and the classic continuum theory of planar detonations. These promising results demonstrate for the first time that simulations using reactive many-body potentials provide a powerful probe of the interplay between the continuum properties of shock waves and the atomic-scale chemistry they induce in condensed-phase detonations. C1 USN,RES LAB,WASHINGTON,DC 20375. RI Brenner, Donald/D-1741-2009 NR 31 TC 129 Z9 132 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 APR 5 PY 1993 VL 70 IS 14 BP 2174 EP 2177 DI 10.1103/PhysRevLett.70.2174 PG 4 WC Physics, Multidisciplinary SC Physics GA KV974 UT WOS:A1993KV97400031 ER PT J AU CHO, GG YESINOWSKI, JP AF CHO, GG YESINOWSKI, JP TI MULTIPLE-QUANTUM NMR DYNAMICS IN THE QUASI-ONE-DIMENSIONAL DISTRIBUTION OF PROTONS IN HYDROXYAPATITE SO CHEMICAL PHYSICS LETTERS LA English DT Article ID SOLID-STATE NMR; CALCIUM AB Multiple-quantum NMR dynamics are reported for the quasi-one-dimensional distribution of uniformly spaced proton spins in hydroxyapatite, Ca5(OH) (PO4)3, using a phase-incremented even-order selective time-reversal pulse sequence. The initial increase of the effective size N with the preparation time for creation of multiple-quantum coherences is linear, in qualitative (but not quantitative) agreement with calculations based upon an ''incremental shell'' model recently developed by Levy and Gleason. An upward curvature observed at longer preparation times is qualitatively ascribed to the incomplete isolation of the linear chains. Slight deficiencies of hydroxyl groups in the linear chain lead to a measurable decrease in the slope of the linear portion of the curve. C1 USN,RES LAB,WASHINGTON,DC 20375. RP CHO, GG (reprint author), MICHIGAN STATE UNIV,DEPT CHEM,E LANSING,MI 48824, USA. NR 24 TC 47 Z9 47 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD APR 2 PY 1993 VL 205 IS 1 BP 1 EP 5 DI 10.1016/0009-2614(93)85157-J PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KU546 UT WOS:A1993KU54600001 ER PT J AU LIAO, SS AF LIAO, SS TI STRATEGIC MANAGEMENT ACCOUNTING SURVEY - OVERHEAD COST ALLOCATION AND PERFORMANCE EVALUATION PRACTICES OF AUSTRALIAN MANUFACTURES - DEAN,GW, JOYE,MP, BLAYNEY,PJ SO ACCOUNTING REVIEW LA English DT Book Review RP LIAO, SS (reprint author), USN,POSTGRAD SCH,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 2 U2 5 PU AMER ACCOUNTING ASSOC PI SARASOTA PA 5717 BESSIE DR, SARASOTA, FL 34233 SN 0001-4826 J9 ACCOUNT REV JI Account. Rev. PD APR PY 1993 VL 68 IS 2 BP 426 EP 427 PG 2 WC Business, Finance SC Business & Economics GA KZ424 UT WOS:A1993KZ42400019 ER PT J AU ISENBERG, MT AF ISENBERG, MT TI INTERPRETING FILMS - STUDIES IN THE HISTORICAL RECEPTION OF AMERICAN CINEMA - STAIGER,J SO AMERICAN HISTORICAL REVIEW LA English DT Book Review RP ISENBERG, MT (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER HISTORICAL REVIEW PI WASHINGTON PA 400 A ST SE, WASHINGTON, DC 20003 SN 0002-8762 J9 AM HIST REV JI Am. Hist. Rev. PD APR PY 1993 VL 98 IS 2 BP 596 EP 597 DI 10.2307/2167020 PG 2 WC History SC History GA KY472 UT WOS:A1993KY47200187 ER PT J AU GREEN, JM JUNE, CH SHIMIZU, Y TURKA, LA LINSLEY, PS THOMPSON, CB AF GREEN, JM JUNE, CH SHIMIZU, Y TURKA, LA LINSLEY, PS THOMPSON, CB TI CD28 AND LFA-1 INTERACTIONS IN SUPERANTIGEN AND ALLOANTIGEN ACTIVATION OF HUMAN T-CELLS SO AMERICAN REVIEW OF RESPIRATORY DISEASE LA English DT Meeting Abstract C1 UNIV MICHIGAN,DEPT MED,ANN ARBOR,MI 48109. UNIV MICHIGAN,DEPT MICROBIOL IMMUNOL,ANN ARBOR,MI 48109. UNIV MICHIGAN,HOWARD HUGHES MED INST,ANN ARBOR,MI 48109. USN,MED RES INST,BETHESDA,MD 20814. BRISTOL MYERS SQUIBB,SEATTLE,WA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER LUNG ASSOC PI NEW YORK PA 1740 BROADWAY, NEW YORK, NY 10019 SN 0003-0805 J9 AM REV RESPIR DIS JI Am. Rev. Respir. Dis. PD APR PY 1993 VL 147 IS 4 SU S BP A474 EP A474 PG 1 WC Respiratory System SC Respiratory System GA LB149 UT WOS:A1993LB14901801 ER PT J AU ONEIL, KM LAZARUS, AA AF ONEIL, KM LAZARUS, AA TI SHOULD INTERNISTS-IN-TRAINING PERFORM THORACENTESIS - COMPLICATIONS AT A MILITARY TEACHING HOSPITAL SO AMERICAN REVIEW OF RESPIRATORY DISEASE LA English DT Meeting Abstract C1 USN HOSP,PORTSMOUTH,VA. EASTERN VIRGINIA MED SCH,NORFOLK,VA 23501. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER LUNG ASSOC PI NEW YORK PA 1740 BROADWAY, NEW YORK, NY 10019 SN 0003-0805 J9 AM REV RESPIR DIS JI Am. Rev. Respir. Dis. PD APR PY 1993 VL 147 IS 4 SU S BP A92 EP A92 PG 1 WC Respiratory System SC Respiratory System GA LB149 UT WOS:A1993LB14900320 ER PT J AU LEFEVER, EB POTTER, PS SEELEY, NR AF LEFEVER, EB POTTER, PS SEELEY, NR TI PROPOFOL SEDATION FOR PEDIATRIC MRI SO ANESTHESIA AND ANALGESIA LA English DT Letter ID CHILDREN RP LEFEVER, EB (reprint author), USN HOSP,DEPT ANESTHESIOL,OAKLAND,CA 94627, USA. NR 4 TC 14 Z9 14 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0003-2999 J9 ANESTH ANALG JI Anesth. Analg. PD APR PY 1993 VL 76 IS 4 BP 919 EP 920 PG 2 WC Anesthesiology SC Anesthesiology GA KY041 UT WOS:A1993KY04100071 PM 8466060 ER PT J AU WALKER, WA PATE, JW AMUNDSON, D KENNEDY, C AF WALKER, WA PATE, JW AMUNDSON, D KENNEDY, C TI AIDS-RELATED BRONCHOPLEURAL FISTULA SO ANNALS OF THORACIC SURGERY LA English DT Letter C1 USN HOSP,DIV PULM MED,SAN DIEGO,CA 92134. RP WALKER, WA (reprint author), UNIV TENNESSEE CTR HLTH SCI,DEPT SURG,956 COURT AVE,MEMPHIS,TN 38163, USA. NR 1 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0003-4975 J9 ANN THORAC SURG JI Ann. Thorac. Surg. PD APR PY 1993 VL 55 IS 4 BP 1048 EP 1048 PG 1 WC Cardiac & Cardiovascular Systems; Respiratory System; Surgery SC Cardiovascular System & Cardiology; Respiratory System; Surgery GA KX854 UT WOS:A1993KX85400054 PM 8466326 ER PT J AU PEARSON, AD GREENWOOD, M HEALING, TD ROLLINS, D SHAHAMAT, M DONALDSON, J COLWELL, RR AF PEARSON, AD GREENWOOD, M HEALING, TD ROLLINS, D SHAHAMAT, M DONALDSON, J COLWELL, RR TI COLONIZATION OF BROILER-CHICKENS BY WATERBORNE CAMPYLOBACTER-JEJUNI SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Article ID ENTERITIS; COLI; TRANSMISSION; INFECTIONS; HUMANS; MEATS; AGGLUTINATION; SEROTYPES; BACTERIA; ANIMALS AB Chickens on a broiler farm in southern England were found to be colonized with Campylobacter jejuni of a single serotype, Lior 1 Penner 4. The farm was the sole supplier of a local slaughterhouse associated with a campylobacter outbreak in 1984 caused by this serotype. The serotype persisted on the farm for at least 18 months after the outbreak; its prevalence in the human population served by the farm remained high until it disappeared from the farm in 1986. The possible sources and routes of transmission of C. jejuni to the broilers on the farm were investigated. The results showed that vertical transmission, feed, litter, small mammals, and environmental or airborne cross-contamination between sheds or successive crops could be excluded as persistent sources of C. jejuni. The predominant source of C. jejuni on the farm was shown to be the water supply. Direct microscopy and fluorescent antibody methods revealed presumptive campylobacters throughout the farm's water system. Campylobacter-free chickens raised in an animal house and given water from the farm supply became colonized with the serotype of C. jejuni endemic on the farm (Lior 1 Penner 4). An intervention program based on water chlorination, shed drinking system cleaning and disinfection, and withdrawal of furazolidone from feed reduced the proportion of birds colonized with campylobacter from 81 to 7% and was associated with a 1,000- to 10,000-fold reduction in campylobacters recoverable from the carcasses. Two months after the end of the intervention program colonization of the birds returned to high levels (84%), indicating that there was a temporal association between intervention and reduced colonization with C. jejuni. Investigations continue to establish the general applicability of these findings. C1 PUBL HLTH LAB SERV,CTR COMMUNICABLE DIS SURVEILLANCE,LONDON NW9 5EQ,ENGLAND. PUBL HLTH LAB,POOLE BH15 2JB,DORSET,ENGLAND. USN,MED RES INST,ENTER DIS PROGRAM,IMMUNOPHYSIOL SECT,BETHESDA,MD 20889. UNIV MARYLAND,MARYLAND BIOTECHNOL INST,COLL PK,MD 20742. UNIV MARYLAND,DEPT MICROBIOL,COLL PK,MD 20742. MELSTOCK FARM,DORSET DT2 8QT,ENGLAND. RP PEARSON, AD (reprint author), ST THOMAS HOSP,DEPT INFECT CONTROL,LEVEL 5,N WING,LAMBETH PALACE RD,LONDON SE1 7EH,ENGLAND. NR 38 TC 176 Z9 177 U1 0 U2 3 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0099-2240 J9 APPL ENVIRON MICROB JI Appl. Environ. Microbiol. PD APR PY 1993 VL 59 IS 4 BP 987 EP 996 PG 10 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA KV717 UT WOS:A1993KV71700007 PM 8476300 ER PT J AU SEELY, JF HOLLAND, GE HUNTER, WR MCCOY, RP DYMOND, KF CORSON, M AF SEELY, JF HOLLAND, GE HUNTER, WR MCCOY, RP DYMOND, KF CORSON, M TI EFFECT OF OXYGEN ATOM BOMBARDMENT ON THE REFLECTANCE OF SILICON-CARBIDE MIRRORS IN THE EXTREME ULTRAVIOLET REGION SO APPLIED OPTICS LA English DT Article ID OPTICS; SI AB Chemical-vapor-deposited silicon carbide mirrors were exposed to bombardment by 8-km/s oxygen atoms that simulated the effects of exposure in low Earth orbit for periods up to 7.5 yr. The reflectances of four mirrors were measured before and after exposure at five wavelengths (58.4, 73.6, 104.8, 121.6, and 161 nm) and at 11 angles of incidence from 5-degrees to 80-degrees. The oxygen exposure reduced the normal-incidence reflectances by factors of 1.5-4.5 in the wavelength rate of 58.4-121.6 nm but had no effect on the visual appearance. The optical constants and the thicknesses of the thin surface layers present on the SiC substrates were determined from the reflectance measurements. This analysis indicated that before exposure the surface layers were composed of SiO(x) (where x is approximately 1.5) with thicknesses of 0.8-1.8 nm. After exposure to 8-km/s oxygen atoms, the surface layers were composed of SiO(x) with thicknesses of 3.5-4.5 nm. There were no systematic differences between the measured reflectances after simulated space exposures of 1.5, 4.5, and 7.5 years. This implied that most of the growth in thickness of the SiO(x) layers occurred early in the exposure and stabilized at thicknesses of 3.5-4.5 nm. The optical results were consistent with x-ray photoelectron spectroscopy of the four mirrors after oxygen exposure. C1 SFA INC, LANDOVER, MD 20785 USA. RES SUPPORT INSTRUMENTS INC, ALEXANDRIA, VA 22314 USA. RP SEELY, JF (reprint author), USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. OI Dymond, Kenneth/0000-0001-8060-9016 NR 14 TC 11 Z9 11 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD APR 1 PY 1993 VL 32 IS 10 BP 1805 EP 1810 PG 6 WC Optics SC Optics GA KW465 UT WOS:A1993KW46500017 PM 20820315 ER PT J AU HARRINGTON, RS DAHN, CC KALLARAKAL, VV GUETTER, HH RIEPE, BY WALKER, RL PIER, JR VRBA, FJ LUGINBUHL, CB HARRIS, HC ABLES, HD AF HARRINGTON, RS DAHN, CC KALLARAKAL, VV GUETTER, HH RIEPE, BY WALKER, RL PIER, JR VRBA, FJ LUGINBUHL, CB HARRIS, HC ABLES, HD TI UNITED-STATES NAVAL OBSERVATORY PHOTOGRAPHIC PARALLAXES - LIST-IX SO ASTRONOMICAL JOURNAL LA English DT Article ID FAINT STARS; CATALOG AB Trigonometric parallaxes, relative proper motions, and photometry are presented for 122 stars in 111 systems. Of these stars, 70 are brighter than V= 10.0. C1 USN OBSERV,FLAGSTAFF,AZ 86002. RP HARRINGTON, RS (reprint author), USN OBSERV,WASHINGTON,DC 20392, USA. NR 25 TC 43 Z9 43 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD APR PY 1993 VL 105 IS 4 BP 1571 EP 1580 DI 10.1086/116537 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KU572 UT WOS:A1993KU57200032 ER PT J AU WAGNER, SJ WITZEL, A KRICHBAUM, TP WEGNER, R QUIRRENBACH, A ANTON, K ERKENS, U KHANNA, R ZENSUS, A AF WAGNER, SJ WITZEL, A KRICHBAUM, TP WEGNER, R QUIRRENBACH, A ANTON, K ERKENS, U KHANNA, R ZENSUS, A TI INTRADAY VARIABILITY IN THE BL LAC OBJECT 0954+658 SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE BL LAC OBJECTS, GENERAL; BL LAC OBJECTS, 0954+658; INTRADAY VARIABILITY; SYNCHROTRON RADIATION; ISM, INTERSTELLAR SCATTERING ID RADIO; LACERTAE AB In the course of a four-week monitoring program in February 1990 we detected several rapid outbursts in the BL Lac object 0954+658. Although the total duration of individual events was less than 4 days, the brightness increased by more than a factor of 6 at 650 nm. Similar variations had earlier been discovered in a small sample of BL Lac objects (Wagner 1991). The shapes of the outbursts reported here have light curves that are very similar to one another. They follow exponentials with almost identical e-folding times of about 6.4 hours; the rising- and decay- time-scales are similar. The variations are most probably intrinsic. We argue that the outbursts are probably not caused by a flaring component, whose particles could not cool fast enough to produce a decay as rapid as observed. Instead, the variations might be due to geometric effects which would be able to produce light curves invariant under time reversal. Radio measurements performed simultaneously have gaps during the two major outbursts seen in the optical waveband, limiting our ability to show the presence or absence of optical-radio correlations. However, during an earlier one-week monitoring campaign in May 1989 the radio and optical light curves were very similar. This leads us to conclude that 0954+658 probably displays rapid intrinsic radio variations, in addition to the well established interstellar scintillation on somewhat longer time scales. C1 MAX PLANCK INST RADIOASTRON, W-5300 BONN 1, GERMANY. USN OBSERV, NRL, OPT INTERFEROMETER PROJECT, WASHINGTON, DC 20392 USA. NATL RADIO ASTRON OBSERV, SOCORRO, NM 87801 USA. RP WAGNER, SJ (reprint author), LANDESSTERNWARTE KONIGSTUHL, W-6900 HEIDELBERG 1, GERMANY. NR 16 TC 54 Z9 54 U1 2 U2 3 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD APR PY 1993 VL 271 IS 1 BP 344 EP 347 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KU738 UT WOS:A1993KU73800039 ER PT J AU RAFFERTY, TJ LOADER, BR AF RAFFERTY, TJ LOADER, BR TI IMPROVEMENTS IN THE USE OF DAYTIME STAR OBSERVATIONS FROM A TRANSIT CIRCLE SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE TRANSIT CIRCLE; ASTROMETRY; OBSERVATIONAL METHODS AB The Seven-inch transit circle of the US Naval Observatory presently located in New Zealand is able to observe stars in the daytime to visual magnitude 5.3 using an image dissector. Thus a far greater range of day stars have been observed than is possible with a visual instrument. The daytime observations have shown changes of 0.70 s of arc for the declination clamp difference and 0.01 s of time for the clock corrections from the values determined using the night observations. The use of the daytime determined adjustments allows for a more homogeneous daytime system. With the increased number and wider distribution of daytime observations, the traditional method of adjusting the daytime system of observations to the nighttime system, necessary in the formation of an absolute star catalog, can be improved. C1 BLACK BIRCH ASTROMETR OBSERV, BLENHEIM, NEW ZEALAND. RP RAFFERTY, TJ (reprint author), USN OBSERV, 3450 MASS AVE NW, WASHINGTON, DC 20392 USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD APR PY 1993 VL 271 IS 2 BP 727 EP 733 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KY482 UT WOS:A1993KY48200043 ER PT J AU NEMIROFF, RJ BECKER, PA WOOD, KS AF NEMIROFF, RJ BECKER, PA WOOD, KS TI PROPERTIES OF ULTRACOMPACT NEUTRON-STARS SO ASTROPHYSICAL JOURNAL LA English DT Article DE DENSE MATTER; ELEMENTARY PARTICLES; EQUATION OF STATE; STARS, NEUTRON ID X-RAY BURST; GENERAL-RELATIVITY; HOT SPOTS; EQUATION; MODELS; STATE AB Some recently published equations of state for neutron stars admit an ultracompact solution that allows a stellar radius less than 1.5 times the Schwarzschild radius. These stars hence exhibit a photon sphere. Here we speculate on some additional properties these stars would have because of their extreme gravity. One of the properties is the gravitational lensing of surface features that would inhibit the appearance of some hot spots in light curves while highlighting the appearance of others. Because the angle subtended by the star can be affected by the curvature of spacetime, relativistic modifications to the Eddington limit in addition to the usual gravitational redshift come into play. The correction to the ''standard'' relativistic Eddington limit L0 = (47piGMm(H)c/sigma(T)(1 - R(s)/r)-1/2 never exceeds 50% for uniformly bright neutron stars; however, corrections of this magnitude may be important in the interpretation of X-ray burst luminosities if the expanding envelope is optically thin and not much larger than the star. Lastly, we speculate on the existence of bound neutrino orbits in and around these stars, including the existence of a gravitationally bound, stable, ''neutrino sphere'' inside the surface of such a star, and a bound, stable ''neutrino cloud'' extending outside the star's surface to the photon sphere. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. NR 26 TC 8 Z9 8 U1 0 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD APR 1 PY 1993 VL 406 IS 2 BP 590 EP 595 DI 10.1086/172471 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KU607 UT WOS:A1993KU60700025 ER PT J AU SHARPE, RW RECTOR, JT RUSHIN, JM GARVIN, DF COTELINGAM, JD AF SHARPE, RW RECTOR, JT RUSHIN, JM GARVIN, DF COTELINGAM, JD TI SPLENIC METASTASIS IN HAIRY-CELL LEUKEMIA SO CANCER LA English DT Article DE PROSTATIC NEOPLASM; UNKNOWN PRIMARY NEOPLASM; PROSTATE-SPECIFIC ANTIGEN; PROSTATIC ACID PHOSPHATASE ANTIGEN; SPLENIC METASTASIS; HAIRY CELL LEUKEMIA; NATURAL KILLER CELLS ID NATURAL-KILLER CELL; NK ACTIVITY; RETICULOENDOTHELIOSIS; ADENOCARCINOMA; CARCINOMA; HCL; FEATURES; BIOLOGY; SUBSETS; CANCER AB Background. Splenic metastasis is uncommon and usually occurs in the setting of widespread visceral metastasis. Splenic metastasis as an initial manifestation of disease and sole site of metastasis has not been reported previously. Methods. The authors describe a patient with hairy cell leukemia (HCL) with the unexpected finding of metastatic adenocarcinoma in the spleen. Direct inspection at the time of laparotomy and subsequent radiographic studies did not show a primary or additional metastatic tumor. Eventually, he manifested evidence of pulmonary and hepatic metastases and died with fungal sepsis. Results. The splenectomy specimen showed HCL and metastatic adenocarcinoma. Immunohistochemical studies showed adenocarcinoma with diffuse cytoplasmic staining for prostate-specific antigen and focally positive results with prostatic acid phosphatase antigen. Postmortem examination 9 months later showed HCL and widespread metastatic adenocarcinoma. No primary tumor was identified, and multiple tissue blocks of the prostate had negative findings for tumor. Conclusions. The immunohistologic features of the metastatic adenocarcinoma were interpreted as prostatic in origin. The pattern of isolated metastatic disease in the absence of primary tumor appears to represent another possible atypical disease presentation of prostatic cancer. Hairy cell-induced structural and immunologic alterations within the splenic microenvironment may have contributed to this unique clinical presentation. C1 NATL NAVAL MED CTR, DEPT LAB MED, BETHESDA, MD 20814 USA. RP SHARPE, RW (reprint author), USN HOSP, DEPT LAB MED, SAN DIEGO, CA 92134 USA. NR 46 TC 9 Z9 9 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0008-543X J9 CANCER JI Cancer PD APR 1 PY 1993 VL 71 IS 7 BP 2222 EP 2226 DI 10.1002/1097-0142(19930401)71:7<2222::AID-CNCR2820710710>3.0.CO;2-B PG 5 WC Oncology SC Oncology GA KU002 UT WOS:A1993KU00200009 PM 8453541 ER PT J AU CONNOLLY, JP AF CONNOLLY, JP TI HEMOPTYSIS AS A PRESENTATION OF MILD HEMOPHILIA-A IN AN ADULT SO CHEST LA English DT Note ID DISEASE AB It is not unusual for mild hemophilla A to escape detection into adolescent years and it is often detected following dental extractions or other mild trauma. The present report describes a patient shown to have only 8 to 9 percent factor VIII activity at age 30 years. The presentation of recurrent mild hemoptysis with upper respiratory tract infections is unusual and of interest in the differential diagnosis of hemoptysis. RP CONNOLLY, JP (reprint author), NAVAL HOSP,DEPT INTERNAL MED,PENSACOLA,FL, USA. NR 10 TC 5 Z9 5 U1 0 U2 0 PU AMER COLL CHEST PHYSICIANS PI NORTHBROOK PA 3300 DUNDEE ROAD, NORTHBROOK, IL 60062-2348 SN 0012-3692 J9 CHEST JI Chest PD APR PY 1993 VL 103 IS 4 BP 1281 EP 1282 DI 10.1378/chest.103.4.1281 PG 2 WC Critical Care Medicine; Respiratory System SC General & Internal Medicine; Respiratory System GA KV850 UT WOS:A1993KV85000065 PM 8131487 ER PT J AU NAITOH, P KELLY, T BABKOFF, H AF NAITOH, P KELLY, T BABKOFF, H TI SLEEP INERTIA - BEST TIME NOT TO WAKE UP SO CHRONOBIOLOGY INTERNATIONAL LA English DT Article DE SLEEP; SLEEP INERTIA; SLEEP DEPRIVATION; COGNITIVE PERFORMANCE; CIRCADIAN RHYTHMS ID MULTIPLE AB Sleep inertia is a brief period of inferior task performance and/or disorientation immediately after sudden awakening from sleep. Normally sleep inertia lasts <5 min and has no serious impact on conducting routine jobs. This preliminary study examined whether there are best and worst times to wake up stemming from circadian effects on sleep inertia. Since the process of falling asleep is strongly influenced by circadian time, the reverse process of awakening could be similarly affected. A group of nine subjects stayed awake for a 64-h continuous work period, except for 20-min sleep periods (naps) every 6 h. Another group of 10 subjects stayed awake for 64 h without any sleep. The differences between these two groups in performance degradation are expected to show sleep inertia on the background of sleep deprivation. Sleep inertia was measured with Baddeley's logical reasoning task, which started within 1 min of awakening and lasted for 5 min. There appeared to be no specific circadian time when sleep inertia is either maximal or minimal. An extreme form of sleep inertia was observed, when the process of waking up during the period of the circadian body temperature trough became so traumatic that it created ''sleep (nap) aversion.'' The findings lead to the conclusion that there are no advantages realized on sleep inertia by waking up from sleep at specific times of day. C1 BAR ILAN UNIV, DEPT PSYCHOL, RAMAT GAN, ISRAEL. RP NAITOH, P (reprint author), USN, HLTH RES CTR, SAN DIEGO, CA 92186 USA. NR 23 TC 60 Z9 60 U1 0 U2 2 PU INFORMA HEALTHCARE PI LONDON PA TELEPHONE HOUSE, 69-77 PAUL STREET, LONDON EC2A 4LQ, ENGLAND SN 0742-0528 J9 CHRONOBIOL INT JI Chronobiol. Int. PD APR PY 1993 VL 10 IS 2 BP 109 EP 118 DI 10.1080/07420529309059699 PG 10 WC Biology; Physiology SC Life Sciences & Biomedicine - Other Topics; Physiology GA KX485 UT WOS:A1993KX48500005 PM 8500187 ER PT J AU CULHAM, P AF CULHAM, P TI ROMANS, GREEKS, AND DELMATAE - RECONSTRUCTING THE CONTEXT OF 'RDGE' 24 SO CLASSICAL ANTIQUITY LA English DT Article RP CULHAM, P (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 58 TC 4 Z9 4 U1 0 U2 0 PU UNIV CALIF PRESS PI BERKELEY PA JOURNALS DEPT 2120 BERKELEY WAY, BERKELEY, CA 94720 SN 0278-6656 J9 CLASSICAL ANTIQUITY JI Class. Antiq. PD APR PY 1993 VL 12 IS 1 BP 51 EP 64 PG 14 WC Classics SC Classics GA LE397 UT WOS:A1993LE39700003 ER PT J AU NEWTON, JA WEISS, PJ BOWLER, WA OLDFIELD, EC AF NEWTON, JA WEISS, PJ BOWLER, WA OLDFIELD, EC TI SOFT-TISSUE INFECTION DUE TO MYCOBACTERIUM-SMEGMATIS - REPORT OF 2 CASES SO CLINICAL INFECTIOUS DISEASES LA English DT Article AB Mycobacterium smegmatis is an uncommon pathogen in humans. Fourteen cases of skin or soft-tissue infection due to M. smegmatis have been previously reported. We report two cases of posttraumatic M. smegmatis infection of the lower extremity. M. smegmatis infection produces chronic cellulitis with fistula formation that is most commonly a result of direct traumatic inoculation of contaminated material. Extensive surgical debridement followed by skin grafting has been necessary for cure in the majority of cases. C1 USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134. RP NEWTON, JA (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 11 TC 32 Z9 33 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 1058-4838 J9 CLIN INFECT DIS JI Clin. Infect. Dis. PD APR PY 1993 VL 16 IS 4 BP 531 EP 533 PG 3 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA KU977 UT WOS:A1993KU97700016 PM 8513061 ER PT J AU KARK, JA HETZEL, DP LINDGREN, KM LARKIN, TM GARDNER, JW JARMULOWICZ, MA AF KARK, JA HETZEL, DP LINDGREN, KM LARKIN, TM GARDNER, JW JARMULOWICZ, MA TI LIFE-THREATENING ARRHYTHMIAS IN EXERTIONAL HEAT-STROKE SO CLINICAL RESEARCH LA English DT Meeting Abstract C1 WALTER REED ARMY INST RES,DIV MED,WASHINGTON,DC 20307. WASHINGTON ADVENT HOSP,DEPT CARDIOL,WASHINGTON,DC. NAVAL HOSP,MED SERV,BEAUFORT,SC. UNIFORMED SERV UNIV HLTH SCI,WASHINGTON,DC. NAVAL HOSP,NURSING SERV,BEAUFORT,SC. NR 0 TC 1 Z9 1 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 SN 0009-9279 J9 CLIN RES JI Clin. Res. PD APR PY 1993 VL 41 IS 2 BP A341 EP A341 PG 1 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA KW761 UT WOS:A1993KW76101268 ER PT J AU WANG, HH ROGERS, WO KANG, YH HOFFMAN, SL AF WANG, HH ROGERS, WO KANG, YH HOFFMAN, SL TI EXPRESSION OF PLASMODIUM-YOELII CIRCUMSPOROZOITE PROTEIN AND SPOROZOITE SURFACE PROTEIN-2 IN LEISHMANIA-ENRIETTII SO CLINICAL RESEARCH LA English DT Meeting Abstract C1 USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20814. USN,MED RES INST,PATHOBIOL BRANCH,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 SN 0009-9279 J9 CLIN RES JI Clin. Res. PD APR PY 1993 VL 41 IS 2 BP A208 EP A208 PG 1 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA KW761 UT WOS:A1993KW76100526 ER PT J AU XU, LC STAHL, SK DAVE, HPG CORRELL, PH KESSLER, S DUNBAR, C KARLSSON, S AF XU, LC STAHL, SK DAVE, HPG CORRELL, PH KESSLER, S DUNBAR, C KARLSSON, S TI A CLINICALLY ACCEPTABLE PROTOCOL YIELDS HIGH-EFFICIENCY TRANSFER OF THE GLUCOCEREBROSIDASE GENE INTO CD34+ PROGENITORS SO CLINICAL RESEARCH LA English DT Meeting Abstract C1 NINCDS,DEV & METAB NEUROL BRANCH,BETHESDA,MD 20892. NHLBI,CLIN HEMATOL BRANCH,BETHESDA,MD 20892. USN,MED RES INST,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 SN 0009-9279 J9 CLIN RES JI Clin. Res. PD APR PY 1993 VL 41 IS 2 BP A194 EP A194 PG 1 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA KW761 UT WOS:A1993KW76100458 ER PT J AU SCHNEIDEWIND, NF AF SCHNEIDEWIND, NF TI NEW SOFTWARE-QUALITY METRICS METHODOLOGY STANDARD FILLS MEASUREMENT NEED SO COMPUTER LA English DT Article RP SCHNEIDEWIND, NF (reprint author), USN,POSTGRAD SCH,WASHINGTON,DC 20350, USA. NR 5 TC 2 Z9 2 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 0018-9162 J9 COMPUTER JI Computer PD APR PY 1993 VL 26 IS 4 BP 105 EP 106 DI 10.1109/2.206549 PG 2 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA KW313 UT WOS:A1993KW31300015 ER PT J AU MAXWELL, DL ONEIL, KM AF MAXWELL, DL ONEIL, KM TI ELECTRICAL-POWER FAILURE IN A CARDIOTHORACIC INTENSIVE-CARE UNIT SO CRITICAL CARE MEDICINE LA English DT Letter RP MAXWELL, DL (reprint author), USN HOSP,PORTSMOUTH,VA, USA. NR 1 TC 3 Z9 3 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0090-3493 J9 CRIT CARE MED JI Crit. Care Med. PD APR PY 1993 VL 21 IS 4 BP 635 EP 636 PG 2 WC Critical Care Medicine SC General & Internal Medicine GA KY919 UT WOS:A1993KY91900030 PM 8472588 ER PT J AU MAKEIG, S AF MAKEIG, S TI AUDITORY EVENT-RELATED DYNAMICS OF THE EEG SPECTRUM AND EFFECTS OF EXPOSURE TO TONES SO ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY LA English DT Article DE EEG SPECTRUM; AUDITORY EVOKED RESPONSE; TEMPORARY THRESHOLD SHIFT ID EVOKED-RESPONSE; PATTERNS AB A new measure of event-related brain dynamics, the event-related spectral perturbation (ERSP), is introduced to study event-related dynamics of the EEG spectrum induced by, but not phase-locked to, the onset of the auditory stimuli. The ERSP reveals aspects of event-related brain dynamics not contained in the ERP average of the same response epochs. Twenty-eight subjects participated in daily auditory evoked response experiments during a 4 day study of the effects of 24 h free-field exposure to intermittent trains of 89 dB low frequency tones. During evoked response testing, the same tones were presented through headphones in random order at 5 sec intervals. No significant changes in behavioral thresholds occurred during or after free-field exposure. ERSPs induced by target pips presented in some inter-tone intervals were larger than, but shared common features with, ERSPs induced by the tones, most prominently a ridge of augmented EEG amplitude from 11 to 18 Hz, peaking 1-1.5 sec after stimulus onset. Following 3-11 h of free-field exposure. this feature was significantly smaller in tone-induced ERSPs; target-induced ERSPs were not similarly affected. These results. therefore, document systematic effects of exposure to intermittent tones on EEG brain dynamics even in the absence of changes in auditory thresholds. RP MAKEIG, S (reprint author), USN,HLTH RES CTR,DEPT COGNIT PERFORMANCE & PSYCHOPHYSIOL,POB 85122,SAN DIEGO,CA 92186, USA. NR 37 TC 338 Z9 341 U1 2 U2 17 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0013-4694 J9 ELECTROEN CLIN NEURO JI Electroencephalogr. Clin. Neurophysiol. PD APR PY 1993 VL 86 IS 4 BP 283 EP 293 DI 10.1016/0013-4694(93)90110-H PG 11 WC Engineering, Biomedical; Clinical Neurology SC Engineering; Neurosciences & Neurology GA KZ467 UT WOS:A1993KZ46700010 PM 7682932 ER PT J AU CHINN, CG GRIMM, IS SMITH, WS WILLIAMS, JP AF CHINN, CG GRIMM, IS SMITH, WS WILLIAMS, JP TI SURVEILLANCE FOR BARRETTS-ESOPHAGUS AFTER CHEMOTHERAPY SO GASTROENTEROLOGY LA English DT Meeting Abstract C1 USN HOSP,DEPT PATHOL,DIV GASTROENTEROL,SAN DIEGO,CA 92134. USN HOSP,DEPT PATHOL,DIV ONCOL,SAN DIEGO,CA 92134. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0016-5085 J9 GASTROENTEROLOGY JI Gastroenterology PD APR PY 1993 VL 104 IS 4 SU S BP A54 EP A54 PG 1 WC Gastroenterology & Hepatology SC Gastroenterology & Hepatology GA KX957 UT WOS:A1993KX95700210 ER PT J AU STANIC, S KENNEDY, EG AF STANIC, S KENNEDY, EG TI REVERBERATION FLUCTUATIONS FROM A SMOOTH SEA-FLOOR SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article ID STATISTICS; SCATTERING; BOTTOM; OCEAN AB High-frequency shallow-water reverberation statistics were measured from a smooth, sandy, featureless seafloor. The reverberation statistics are presented as a function of source frequency (20-180 kHz), grazing angle (30-degrees, 20-degrees, 9.5-degrees) and source beamwidths (1.2-degrees-2.75-degrees). Generally, the reverberation statistics did not follow a Rayleigh fading model. The model dependence of the reverberation statistics exhibited a complex behavior that ranged from near Gaussian to beyond log-normal. The results show that small changes in the source frequency, grazing angles, and beamwidths caused large variations in the model dependence of the reverberation statistics. C1 USN, RES LAB,DIV OCEAN ACOUST,OCEAN ACOUST BRANCH, COMP RESOURCES GRP, BAY ST LOUIS, MS USA. RP USN, RES LAB, BAY ST LOUIS, MS 39529 USA. NR 25 TC 15 Z9 16 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0364-9059 EI 1558-1691 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD APR PY 1993 VL 18 IS 2 BP 95 EP 99 DI 10.1109/48.219529 PG 5 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA LG546 UT WOS:A1993LG54600003 ER PT J AU CARUTHERS, JW NOVARINI, JC AF CARUTHERS, JW NOVARINI, JC TI MODELING BISTATIC BOTTOM SCATTERING STRENGTH INCLUDING A FORWARD SCATTER LOBE SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article DE BOTTOM SCATTERING; BOTTOM INTERACTION; BOTTOM LOSS; REVERBERATION ID SEA-SURFACE; ROUGHNESS; SEAFLOOR; BACKSCATTERING; BEAM AB Sound scattering from the sea floor is a very complex phenomenon. Although it has been studied extensively, a full understanding of a three-dimensional scattering function is still lacking. Most often cited as the working hypothesis is Lambert's law with an empirical coefficient developed by Mackenzie and a bistatic extension based on assumed symmetry about the vertical. However, this form is deficient in several respects. Two important, but often overlooked, deficiencies are the model's lack of a coherent scattering component and its inability to model a ''forward'' scatter lobe. The Naval Oceanographic and Atmospheric Research Laboratory (NOARL) developed the Bistatic Scattering Strength Model (BISSM) in 1987 to overcome these and other deficiencies. In addition to being able to account for a forward lobe, BISSM includes an ability to compute the local incident, specular, and scattering angles with respect to the local facet normal, and with additional assumptions, it may predict the coherent component. Recent improvements in the capabilities or Navy and civilian survey and academic and international research organizations to resolve bathymetry to fine scales stimulated an upgrade to the original BISSM to make use of these finer scales. Reported here is the upgrade to the BISSM scattering strength algorithm and its integration with broad-coverage high-resolution bathymetric databases. The relationship between BISSM and composite roughness theory is discussed. Also discussed are deficiencies in data support available to BISSM and problems in the algorithm that are fundamental in available scattering theory. C1 PLANNING SYST INC,SLIDELL,LA 70458. RP CARUTHERS, JW (reprint author), USN,RES LAB,DIV OCEAN ACOUST,USN OCEAN RES & DEV ACTIV,OCEANOG OFF,BAY ST LOUIS,MS 39529, USA. NR 40 TC 13 Z9 18 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 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD APR PY 1993 VL 18 IS 2 BP 100 EP 107 DI 10.1109/48.219530 PG 8 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA LG546 UT WOS:A1993LG54600004 ER PT J AU LERRO, D BARSHALOM, Y AF LERRO, D BARSHALOM, Y TI INTERACTING MULTIPLE MODEL TRACKING WITH TARGET AMPLITUDE FEATURE SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Article ID MANEUVERING TARGET; ALGORITHM; CLUTTER AB A recursive tracking algorithm is presented which utilizes the strength of target returns to improve track formation performance and track maintenance through target maneuvers in a cluttered environment. This technique combines the interacting multiple model approach (IMM) with a generalized probabilistic data association (PDA) which utilizes the measured return amplitude in conjunction with probabilistic models for the target and clutter returns. The advantage of this approach is that key tracking decisions can be made automatically by assessing the probabilities of target models to provide rapid and accurate decisions for both true track acceptance and false track dismissal in track formation. Furthermore, it also provides the ability to accurately continue tracking through coordinated turn target maneuvers. C1 UNIV CONNECTICUT U157,STORRS,CT 06269. RP LERRO, D (reprint author), USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320, USA. NR 14 TC 99 Z9 116 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 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD APR PY 1993 VL 29 IS 2 BP 494 EP 509 DI 10.1109/7.210086 PG 16 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA KY174 UT WOS:A1993KY17400020 ER PT J AU DRUMHELLER, DM AF DRUMHELLER, DM TI GENERAL EXPRESSIONS FOR RICIAN DENSITY AND DISTRIBUTION-FUNCTIONS SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Letter ID WEIBULL CLUTTER; RADAR DETECTION AB General expressions are derived for the density and distribution functions of the amplitude of a linear matched filter output given a nonfluctuating target in arbitrary clutter. These generalized Rician density and distribution functions are based on the density function of the clutter amplitude at the receiver output, and are easily evaluated numerically. Furthermore, we present error bounds for the numerical calculation of the density function. We also present several numerical examples. RP DRUMHELLER, DM (reprint author), USN,RES LAB,DIV ACOUST,CODE 7140,WASHINGTON,DC 20375, USA. NR 17 TC 13 Z9 14 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 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD APR PY 1993 VL 29 IS 2 BP 580 EP 588 DI 10.1109/7.210098 PG 9 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA KY174 UT WOS:A1993KY17400032 ER PT J AU GORDON, WB AF GORDON, WB TI STATISTICAL MOMENTS OF RADAR CROSS-SECTION SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Note AB The radar cross section for backscatter from a smooth closed convex surface reflector, as calculated from geometrical optics, is shown to have a mean value equal to A/4, where A is the total surface area of the reflector, and the mean is obtained by averaging over all aspects. Results are also given for the calculation of higher order moments and probability density functions. RP GORDON, WB (reprint author), USN,RES LAB,DIV RADAR,CODE 5311,WASHINGTON,DC 20375, USA. NR 10 TC 0 Z9 0 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD APR PY 1993 VL 41 IS 4 BP 506 EP 508 DI 10.1109/8.220985 PG 3 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA LJ350 UT WOS:A1993LJ35000015 ER PT J AU SAMADDAR, SN AF SAMADDAR, SN TI PROPERTIES OF ELECTROMAGNETIC BEAMS GENERATED BY ULTRA-WIDE BANDWIDTH PULSE-DRIVEN ARRAYS - COMMENT SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Note RP SAMADDAR, SN (reprint author), USN,RES LAB,DIV RADAR,RADAR ANAL BRANCH,WASHINGTON,DC 20375, USA. NR 2 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD APR PY 1993 VL 41 IS 4 BP 520 EP 520 DI 10.1109/8.220991 PG 1 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA LJ350 UT WOS:A1993LJ35000022 ER PT J AU SHIH, A HOR, C AF SHIH, A HOR, C TI SECONDARY-EMISSION PROPERTIES AS A FUNCTION OF THE ELECTRON INCIDENCE ANGLE SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article AB Computer codes are presently being developed for the purpose of improving the understanding of Crossed-Field Amplifier (CFA) performance. These codes require a more complete and reliable database of the secondary electron emission properties of the electrode materials than exists in the literature. We describe an experimental method and present results of the secondary emission yield measurements on molybdenum surfaces, both clean and gas-exposed. The surface cleanliness was monitored by Auger Electron Spectroscopy (AES), and all measurements made under ultra-high vacuum conditions (better than 1 x 10(-10) torr). Our results differ from the existing data for which the surface cleanliness was not determined. The secondary electron emission yields were measured as a function of the primary electron energy and also of the angle of incidence. The results were fitted with the analytical expressions of Vaughan, and the comparison found good overall agreement if Vaughan's formulas are slightly modified from the originally proposed form. RP SHIH, A (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 46 Z9 46 U1 1 U2 10 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 APR PY 1993 VL 40 IS 4 BP 824 EP 829 DI 10.1109/16.202797 PG 6 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA KR138 UT WOS:A1993KR13800020 ER PT J AU SOULEN, RJ FOGLE, WE COLWELL, JH AF SOULEN, RJ FOGLE, WE COLWELL, JH TI MODELING FREQUENCY FLUCTUATIONS AND NOISE THERMOMETRY USING AN R-SQUID NOISE THERMOMETER SO IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT LA English DT Article AB We have measured the white and additive noise generated by an R-SQUID noise thermometer whose temperature was varied from 6.3 mK to 0.738 K. We have also conducted room temperature simulations of the effect of white and additive noise on the circuit used to measure the noise for the R-SQUID. We generally found that the measured noise in all cases was fit to within the 0.1% statistical measurement imprecision by a model for the R-SQUID based on frequency modulation. This conformity is sufficiently good that any deficiencies in either do not lead to systematic inaccuracies in the noise temperature scale which exceed 0.1%. Comparisons of the R-SQUID with several other thermometers indicate that the overall agreement is at worst 0.2%. C1 NIST,GAITHERSBURG,MD 20899. RP SOULEN, RJ (reprint author), USN,RES LAB,CODE 6344,WASHINGTON,DC 20375, USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9456 J9 IEEE T INSTRUM MEAS JI IEEE Trans. Instrum. Meas. PD APR PY 1993 VL 42 IS 2 BP 320 EP 323 DI 10.1109/19.278574 PG 4 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA LP755 UT WOS:A1993LP75500046 ER PT J AU WILLIAMS, SM BROWNFIELD, GT DUFFUS, JW AF WILLIAMS, SM BROWNFIELD, GT DUFFUS, JW TI HARMONIC PROPAGATION ON AN ELECTRIC DISTRIBUTION-SYSTEM - FIELD-MEASUREMENTS COMPARED WITH COMPUTER-SIMULATION SO IEEE TRANSACTIONS ON POWER DELIVERY LA English DT Article ID POWER-SYSTEMS AB Power electronic loads are occupying an increasing fraction of the total load on distribution feeders. Coincidentally, there is a greater use of power factor correction capacitors on the distribution system. These two factors can present poor operating conditions in the form of high harmonic levels propagating through a distribution system. Electric utility engineers are facing an ever increasing number of situations which require the analysis of the propagation of harmonics on a distribution system. HARMFLO was developed by EPRI for use in the analysis of harmonics on a power system. However, for a typical analysis of a distribution system, data for some of the parameters required by HARMFLO are not available. Furthermore, exact load information is usually not available. Harmonic levels determined from field tests on a distribution system are compared to results of HARMFLO simulations to determine if this analysis tool can be expected to provide useful results despite the lack of exact information for load modeling and other system parameters. C1 UNION ELECT CO,ST LOUIS,MO 63166. UNIV MISSOURI,POWER ELECTR RES CTR,COLUMBIA,MO 65211. RP WILLIAMS, SM (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,CODE EC WL,MONTEREY,CA 93943, USA. NR 9 TC 11 Z9 11 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0885-8977 J9 IEEE T POWER DELIVER JI IEEE Trans. Power Deliv. PD APR PY 1993 VL 8 IS 2 BP 547 EP 552 DI 10.1109/61.216858 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA LF421 UT WOS:A1993LF42100011 ER PT J AU AINSLEIGH, PL GEORGE, JD AF AINSLEIGH, PL GEORGE, JD TI FULL NEWTON AND CONSTRAINT METHODS FOR SEMILINEAR SIGNAL MODELING SO IEEE TRANSACTIONS ON SIGNAL PROCESSING LA English DT Letter ID ALGORITHM AB We derive an expression for the Hessian matrix of the variable projection functional (VPF), and implement the Hessian using the QR factorization. This is incorporated into a full Newton variable projection (FNVP) algorithm for estimating parameters in semilinear signals. We also introduce a deflation technique for constraining the VPF to contain known basis vectors. For modeling exponential signals, the computational cost of the FNVP algorithm is shown to vary linearly with N, the size of the data vector, while other algorithms vary as N2 or N log2 N. C1 USN,RES LAB,ORLANDO,FL. RP AINSLEIGH, PL (reprint author), USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,ORLANDO,FL 32856, USA. NR 14 TC 4 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1053-587X J9 IEEE T SIGNAL PROCES JI IEEE Trans. Signal Process. PD APR PY 1993 VL 41 IS 4 BP 1689 EP 1692 DI 10.1109/78.212745 PG 4 WC Engineering, Electrical & Electronic SC Engineering GA LA336 UT WOS:A1993LA33600019 ER PT J AU BANKER, RD KAUFFMAN, RJ ZWEIG, D AF BANKER, RD KAUFFMAN, RJ ZWEIG, D TI REPOSITORY EVALUATION OF SOFTWARE REUSE SO IEEE TRANSACTIONS ON SOFTWARE ENGINEERING LA English DT Article DE CASE; COMPUTER-AIDED SOFTWARE ENGINEERING; DOMAIN ANALYSIS; ORGANIZATIONAL LEARNING; REPOSITORIES; SOFTWARE METRICS; SOFTWARE REUSE ID REUSABLE SOFTWARE; PRODUCTIVITY; REUSABILITY AB The traditional unit of analysis and control for software managers is the software project, and subsequently the resulting application system. Today, with the emerging capabilities of computer-aided software engineering (CASE) and corresponding changes in the development process, productivity gains can be realized by reusing portions of the organization's inventory of existing application designs and code. With this opportunity, however, comes the need to monitor software reuse at the corporate level, as well as at the level of the individual software development project. Integrated CASE environments can support such monitoring. We illustrate the use and benefits of repository evaluation of software reuse through an analysis of the evolving repositories of two large firms that recently implemented integrated CASE development tools. The analysis shows that these tools have supported high levels of software reuse, but it also suggests that there remains considerable unexploited reuse potential. Our findings indicate that organizational changes will be required before the full potential of the new technology can be realized. C1 NYU,STERN SCH BUSINESS,DEPT INFORMAT SYST,NEW YORK,NY 10012. USN,POSTGRAD SCH,DEPT ADMINISTRAT SCI,MONTEREY,CA 93943. RP BANKER, RD (reprint author), UNIV MINNESOTA,CARLSON SCH MANAGEMENT,DEPT ACCOUNTING & INFORMAT SYST,MINNEAPOLIS,MN 55455, USA. RI KAUFFMAN, Robert/G-2767-2012 NR 46 TC 33 Z9 33 U1 5 U2 6 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0098-5589 J9 IEEE T SOFTWARE ENG JI IEEE Trans. Softw. Eng. PD APR PY 1993 VL 19 IS 4 BP 379 EP 389 DI 10.1109/32.223805 PG 11 WC Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA LP117 UT WOS:A1993LP11700004 ER PT J AU TRAUGER, RJ GIERMAKOWSKA, WK FERRE, F DUFFY, PC WALLACE, MR LEWIS, DE BEECHAM, HJ BURNETT, KG JENSEN, FC CARLO, DJ AF TRAUGER, RJ GIERMAKOWSKA, WK FERRE, F DUFFY, PC WALLACE, MR LEWIS, DE BEECHAM, HJ BURNETT, KG JENSEN, FC CARLO, DJ TI CELL-MEDIATED-IMMUNITY TO HIV-1 IN REED,WALTER STAGES 1-6 INDIVIDUALS - CORRELATION WITH VIRUS BURDEN SO IMMUNOLOGY LA English DT Article ID CD4+ T-CELLS; IMMUNOLOGICAL ABNORMALITIES; HOMOSEXUAL MEN; IMMUNODEFICIENCY; INFECTION; RECOGNITION; RESPONSES; ANTIGENS; DEFECTS; INVITRO AB Cell-mediated immunity (CMI) to human immunodeficiency virus-1 (HIV-1) was assessed in a blinded fashion for a patient group (n = 79) representing Walter Reed (WR) stages 1-6. At the same time, viral load was quantitatively measured by two different methods, specifically, virus isolation and HIV viral DNA copy number as measured by the polymerase chain reaction (PCR). After unblinding it was determined that the ability to generate a lymphoproliferative response to an inactivated gp120-depleted HIV (HIV-ag) and tetanus toxoid diminished with advancing WR staging, with complete anergy to HIV-ag and tetanus at stage 6. As a group, individuals whose peripheral blood mononuclear cells (PBMC) proliferated to HIV-ag were either virus isolation negative or produced low levels of virus as measured by p24 antigen (<250 pg p24) on day 7. Similarly, HIV DNA copy number in the HIV-ag responders was low (<200 copies/4 x 10(5) PBMC). In contrast, antigen proliferation to tetanus toxoid did not correlate with virus load. Thus, clinical progression as defined by the WR staging system appears to coincide with a loss of CMI to HIV. More importantly, the low viral load measured in HIV-ag responders suggests a link between viral burden and CMI to HIV which might be exploited in the design of immunotherapies for HIV-infected individuals. C1 USN HOSP,SAN DIEGO,CA 92134. RP TRAUGER, RJ (reprint author), IMMUNE RESPONSE CORP,5935 DARWIN COURT,CARLSBAD,CA 92008, USA. NR 28 TC 18 Z9 18 U1 0 U2 1 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0019-2805 J9 IMMUNOLOGY JI Immunology PD APR PY 1993 VL 78 IS 4 BP 611 EP 615 PG 5 WC Immunology SC Immunology GA KV869 UT WOS:A1993KV86900016 PM 8495981 ER PT J AU KELLEY, P WONG, CR MORAN, AL AF KELLEY, P WONG, CR MORAN, AL TI CONTROLLED POROSITY IN SPRAY FORMED PHOSPHOR BRONZE SO INTERNATIONAL JOURNAL OF POWDER METALLURGY LA English DT Article ID FRACTURE; METAL; IRON AB A novel technique has been developed to generate closed cell, spherical porosity during high deposition rate spray forming. Introduction of blowing agent into the semisolid preform surface causes gas formation in a thermal decomposition reaction. Density reductions of up to 30% were generated in a phosphor bronze matrix using barium carbonate as the blowing agent. Hollow glass particles were produced in the same matrix alloy by injection of microsphere precursor frit. A simple Newtonian heat transfer model of agent heating in the spray predicts agent/matrix compatibility. Along with modest improvements in damping capacity, tensile and compressive properties were found to be equal or superior to those of powder metallurgy product at the same porosity levels. RP KELLEY, P (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,DIV MAT ENGINEERS MET & WELDING,ANNAPOLIS,MD 21403, USA. RI Kelley, Paul/C-9155-2016 NR 32 TC 5 Z9 5 U1 0 U2 0 PU AMER POWDER METALLURGY INST PI PRINCETON PA 105 COLLEGE ROAD EAST, PRINCETON, NJ 08540 SN 0888-7462 J9 INT J POWDER METALL JI Int. J. Powder Metall. PD APR PY 1993 VL 29 IS 2 BP 161 EP 170 PG 10 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA LA882 UT WOS:A1993LA88200007 ER PT J AU OWENS, WA AF OWENS, WA TI JOINT LITTORAL WARFARE - OUR FUTURE SO JOHNS HOPKINS APL TECHNICAL DIGEST LA English DT Article AB The Cold War is over, but the world is hardly a peaceful place. Although threats to our national interests may not be as dramatic as the Soviet Union once was, missions abound for our armed forces. The United States is the preeminent military power, but looming budget cuts could debilitate our armed forces, even while Desert Storm's memory is fresh in our minds. The leadership of the Naval Service-an inseparable marriage of the Navy and Marine Corps-is looking ahead to this uncertain future with optimism. By relying on ''jointness'' and advanced technology, we confidently expect to do more with less. RP OWENS, WA (reprint author), USN,WASHINGTON,DC 20350, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU JOHNS HOPKINS UNIV PI LAUREL PA APPLIED PHYSICS LABORATORY ATTN: MANAGING EDITOR JOHN HOPKINS RD, BLDG 1-E254, LAUREL, MD 20723-6099 SN 0270-5214 J9 J HOPKINS APL TECH D JI Johns Hopkins APL Tech. Dig. PD APR-JUN PY 1993 VL 14 IS 2 BP 90 EP 93 PG 4 WC Engineering, Multidisciplinary SC Engineering GA MH528 UT WOS:A1993MH52800003 ER PT J AU REMPT, RP LANGSTON, MJ AF REMPT, RP LANGSTON, MJ TI THEATER MISSILE DEFENSE - TECHNOLOGIES TO SUPPORT A NEW NAVAL MISSION SO JOHNS HOPKINS APL TECHNICAL DIGEST LA English DT Article AB The increased global threat of tactical ballistic missiles has revitalized a national program for joint theater missile defense since the Persian Gulf War. A critical element of this new defense capability will be a sea-based component consisting initially of a relatively short-range system based on a modified Standard Missile and associated changes to the Aegis combat system. A sea-based theater-wide capability may be introduced to complement the land-based Theater High Altitude Area Defense system under development. The Ballistic Missile Defense Organization (formerly known as the Strategic Defense Initiative Organization) and the U.S. Navy are investigating the options for this capability. This article discusses the technologies and system concepts under consideration for the sea-based theater missile defense component. RP REMPT, RP (reprint author), USN,BALLIST MISSILE DEF ORG,THEATER MISSILE DEF STAFF,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU JOHNS HOPKINS UNIV PI LAUREL PA APPLIED PHYSICS LABORATORY ATTN: MANAGING EDITOR JOHN HOPKINS RD, BLDG 1-E254, LAUREL, MD 20723-6099 SN 0270-5214 J9 J HOPKINS APL TECH D JI Johns Hopkins APL Tech. Dig. PD APR-JUN PY 1993 VL 14 IS 2 BP 141 EP 147 PG 7 WC Engineering, Multidisciplinary SC Engineering GA MH528 UT WOS:A1993MH52800008 ER PT J AU SHOTTS, WE MCNAMARA, TM AF SHOTTS, WE MCNAMARA, TM TI A BLUEPRINT FOR THE USE OF UNMANNED UNDERSEA VEHICLES IN LITTORAL WARFARE SO JOHNS HOPKINS APL TECHNICAL DIGEST LA English DT Article AB Our changing global political and military environment has resulted in changes in how we define our national security and in our strategy to achieve and preserve it. These changes have greatly affected our maritime strategy and, combined with increased awareness of the future defense budget, are driving us to restructure our forces. This article discusses the capabilities of unmanned undersea vehicles (UUV's) to support each of the four elements of the Navy's maritime strategy in an affordable way. It identifies potential uuv missions and the areas of technology critical to the effective development of uuv's for those missions. High-technology systems traditionally come at high cost, and the current and future fiscal climates will be less tolerant of technologies that fall short of succeeding in their mission. This article recognizes the need for a constrained approach to technology development, and recommends an approach to a near-term and long-term investment strategy tempered by fiscal and technical realities and defense needs. A key recommendation is that uuv development must remain centrally managed and focused to minimize unnecessary duplication and to ensure fleet interoperability and affordability. RP SHOTTS, WE (reprint author), USN,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU JOHNS HOPKINS UNIV PI LAUREL PA APPLIED PHYSICS LABORATORY ATTN: MANAGING EDITOR JOHN HOPKINS RD, BLDG 1-E254, LAUREL, MD 20723-6099 SN 0270-5214 J9 J HOPKINS APL TECH D JI Johns Hopkins APL Tech. Dig. PD APR-JUN PY 1993 VL 14 IS 2 BP 148 EP 153 PG 6 WC Engineering, Multidisciplinary SC Engineering GA MH528 UT WOS:A1993MH52800009 ER PT J AU KELSO, JM JONES, RT YUNGINGER, JW AF KELSO, JM JONES, RT YUNGINGER, JW TI ANAPHYLAXIS TO MEASLES, MUMPS, AND RUBELLA VACCINE MEDIATED BY IGE TO GELATIN SO JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY LA English DT Article DE MMR; ALLERGY; GELATIN; IGE ANTIBODY ID ALLERGIC REACTIONS; EGG PROTEIN; CHILDREN; HYPERSENSITIVITY; IMMUNIZATION; HAEMACCEL; SAFETY AB Background: Allergic reactions to measles, mumps, and rubella (MMR) vaccine are rare; some have been attributed to allergy to trace quantities of egg proteins. We report a 17-year-old female who had an anaphylactic reaction to MMR vaccine. A primary vaccination with MMR at age 15 months had been uneventful. She is not allergic to eggs; however, ear and throat pruritus and tongue swelling develop after she eats gelatin. MMR vaccine contains gelatin as a stabilizer. Methods and Results: Prick skin tests were positive to 1:10 wt/vol dilutions of MMR vaccine and gelatin but negative to egg. By immunoassay, her serum IgE antibodies were elevated to both MMR vaccine and gelatin, but not to isolated MMR antigens. IgE binding to the gelatin carrier could be inhibited in a dose-dependent fashion by addition of not only MMR vaccine but also gelatin from a variety of animal sources. Immunoblotting confirmed the presence of IgE antibodies to multiple gelatin components as well as to MMR vaccine components. Conclusions: We conclude that the patient has an anaphylactic sensitivity to gelatin, and that her anaphylaxis to MMR vaccine was caused by the gelatin component. This sensitivity may explain other cases of MMR anaphylaxis. C1 USN HOSP,DEPT INTERNAL MED,DIV ALLERGY,SAN DIEGO,CA 92134. MAYO CLIN & MAYO FDN,ALLERG DIS RES LAB,ROCHESTER,MN 55905. RP KELSO, JM (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 28 TC 147 Z9 154 U1 0 U2 3 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0091-6749 J9 J ALLERGY CLIN IMMUN JI J. Allergy Clin. Immunol. PD APR PY 1993 VL 91 IS 4 BP 867 EP 872 DI 10.1016/0091-6749(93)90344-F PG 6 WC Allergy; Immunology SC Allergy; Immunology GA KY251 UT WOS:A1993KY25100007 PM 8473675 ER PT J AU WELCH, BL GRIEM, HR YOUNG, FC AF WELCH, BL GRIEM, HR YOUNG, FC TI DENSITY-MEASUREMENTS OF A NEON Z-PINCH PLASMA SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID IONS AB The absolute intensity of near-ultraviolet emission from a neon Z-pinch plasma is measured with a time-gated, two-dimensional optical multichannel analyzer (OMA). The OMA provides spatial and spectral resolution with a 100 ns gate duration. Spatially resolved continuum emission, Ne VIII line emission, and Ne VIII line-profile measurements are used to determine the pinch diameter, the density of the neon plasma, and the Ne VIII 3p level population. C1 UNIV MARYLAND,COLL PK,MD 20742. RP WELCH, BL (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 25 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 1 PY 1993 VL 73 IS 7 BP 3163 EP 3168 DI 10.1063/1.352986 PG 6 WC Physics, Applied SC Physics GA KV031 UT WOS:A1993KV03100007 ER PT J AU UBERALL, H HOWELL, BF DIAMOND, EL AF UBERALL, H HOWELL, BF DIAMOND, EL TI EFFECTIVE MEDIUM THEORY AND THE ATTENUATION OF GRAPHITE FIBER COMPOSITES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID FILMS AB Measured microwave attentuation values of 20-65 dB have been reported for composites and mats, containing conductive graphite fibers (''fibrils'') of 0.01 mum diameter and up to several hundredths of a millimeter length, in weight concentrations of up to 44%. The measured attenuation is interpreted here in terms of effective medium theory, according to which the composites may either behave as a ''transparent'' conductor (with essentially no conductivity) if the fibers don't touch each other, or else as an actual, but less efficient conductor for the case where electrical contacts between the fibers have been established. Under this latter assumption, the attenuation could be well explained both in the lower frequency ranges, as well as at frequencies up to the measurement limit of 3 GHz. Quantitative fits were achieved by assuming a reduced ''effective'' conductivity of the composite due to imperfect contacts between the fibers. C1 CATHOLIC UNIV AMER, DEPT PHYS, WASHINGTON, DC 20064 USA. RP USN, CTR SURFACE WARFARE, CARDEROCK DIV, ANNAPOLIS DETACHMENT, ANNAPOLIS, MD 21402 USA. NR 14 TC 10 Z9 10 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD APR 1 PY 1993 VL 73 IS 7 BP 3441 EP 3445 PG 5 WC Physics, Applied SC Physics GA KV031 UT WOS:A1993KV03100046 ER PT J AU KRAIGER, K FORD, JK SALAS, E AF KRAIGER, K FORD, JK SALAS, E TI APPLICATION OF COGNITIVE, SKILL-BASED, AND AFFECTIVE THEORIES OF LEARNING OUTCOMES TO NEW METHODS OF TRAINING EVALUATION SO JOURNAL OF APPLIED PSYCHOLOGY LA English DT Review ID SELF-EFFICACY; INDIVIDUAL-DIFFERENCES; PERFORMANCE; KNOWLEDGE; STUDENTS; MOTIVATION; MANAGEMENT; ATTITUDES; TASK; PARTICIPATION AB Although training evaluation is recognized as an important component of the instructional design model, there are no theoretically based models of training evaluation. This article attempts to move toward such a model by developing a classification scheme for evaluating learning outcomes. Learning constructs are derived from a variety of research domains, such as cognitive, social, and instructional psychology and human factors. Drawing from this research, we propose cognitive, skill-based, and affective learning outcomes (relevant to training) and recommend potential evaluation measures. The learning outcomes and associated evaluation measures are organized into a classification scheme. Requirements for providing construct-oriented evidence of validity for the scheme are also discussed. C1 MICHIGAN STATE UNIV,DEPT PSYCHOL,E LANSING,MI 48824. USN,CTR TRAINING SYST,DIV HUMAN FACTORS,WASHINGTON,DC 20350. RP KRAIGER, K (reprint author), UNIV COLORADO,DEPT PSYCHOL,CAMPUS BOX 173,POB 173364,DENVER,CO 80217, USA. NR 158 TC 437 Z9 437 U1 9 U2 65 PU AMER PSYCHOLOGICAL ASSOC PI WASHINGTON PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 SN 0021-9010 J9 J APPL PSYCHOL JI J. Appl. Psychol. PD APR PY 1993 VL 78 IS 2 BP 311 EP 328 DI 10.1037//0021-9010.78.2.311 PG 18 WC Psychology, Applied; Management SC Psychology; Business & Economics GA KY241 UT WOS:A1993KY24100017 ER PT J AU NEBEKER, DM TATUM, BC AF NEBEKER, DM TATUM, BC TI THE EFFECTS OF COMPUTER MONITORING, STANDARDS, AND REWARDS ON WORK PERFORMANCE, JOB-SATISFACTION, AND STRESS SO JOURNAL OF APPLIED SOCIAL PSYCHOLOGY LA English DT Article ID GOAL AB The effects of automated computer monitoring under different conditions of performance standards and reward were examined in two studies conducted in a simulated organization. In the first study, 37 computer operators were divided into six groups who worked for a 2-week period under different levels of performance standards. Individual keystrokes per hour and productive time was monitored by the computers for all of the groups (one group was a control group which was monitored but was unaware of the monitoring). Four of the six groups were assigned work standards, and performance against standards was also monitored for these four groups. Feedback reports on the monitored performance were available on demand at the individual consoles for those groups which were informed of the monitoring. The results showed that computer monitoring and feedback led to increased key rate compared to the control group which was not aware of monitoring. There was little effect of monitoring on work quality, satisfaction, and stress. In the second study, 24 operators worked for a 9-week period under various performance standards and rewards. Individual keystrokes per hour, productive time, and performance against standards were monitored by the computers for all workers. Feedback reports on performance against standards and rewards earned were available on demand at the individual consoles. The results revealed that the feedback from different combinations of standards and rewards had varying effects on performance, satisfaction, and stress. These effects, and the results from the first study, are discussed in terms of goal setting and expectancy theory. C1 CALIF SCH PROFESS PSYCHOL,SAN DIEGO,CA 92121. RP NEBEKER, DM (reprint author), USN,CTR PERSONNEL RES & DEV,DEPT ORG SYST,53335 RYNE RD,SAN DIEGO,CA 92152, USA. NR 25 TC 38 Z9 38 U1 2 U2 7 PU V H WINSTON & SON INC PI PALM BEACH PA 360 SOUTH OCEAN BLVD, PH-B, PALM BEACH, FL 33480 SN 0021-9029 J9 J APPL SOC PSYCHOL JI J. Appl. Soc. Psychol. PD APR 1 PY 1993 VL 23 IS 7 BP 508 EP 536 DI 10.1111/j.1559-1816.1993.tb01101.x PG 29 WC Psychology, Social SC Psychology GA LG535 UT WOS:A1993LG53500002 ER PT J AU WOLF, MK TAYLOR, DN BOEDEKER, EC HYAMS, KC MANEVAL, DR LEVINE, MM TAMURA, K WILSON, RA ECHEVERRIA, P AF WOLF, MK TAYLOR, DN BOEDEKER, EC HYAMS, KC MANEVAL, DR LEVINE, MM TAMURA, K WILSON, RA ECHEVERRIA, P TI CHARACTERIZATION OF ENTEROTOXIGENIC ESCHERICHIA-COLI ISOLATED FROM UNITED-STATES TROOPS DEPLOYED TO THE MIDDLE-EAST SO JOURNAL OF CLINICAL MICROBIOLOGY LA English DT Article ID CELL CHOLERA VACCINE; COLONIZATION FACTORS; TRAVELERS DIARRHEA; MILITARY PERSONNEL; FIMBRIAL ADHESINS; SURFACE-ANTIGENS; CHILDREN; DISEASE; PCF8775; PURIFICATION AB Enterotoxigenic Escherichia coli (ETEC) was a common cause of traveler's diarrhea in U.S. soldiers in the Middle East in 1989 and 1990. To determine which bacterial components would be useful in a vaccine, potential protective antigens (toxin, colonization factor antigen [CFA], and serotype) from 189 ETEC isolates were examined. Nearly half of the isolates expressed both ETEC toxins, 39% had only heat-stable enterotoxin (ST), and 17% had heat-labile enterotoxin (LT). CFA/I was the least common colonization factor antigen (11%), CFA/II was common (34%), as was CFA/IV (31%), and 24% expressed none of these CFAs. Fifty-seven O:H serotypes were found. Serotype 06:H16 was the most common, occurring in 29% of the ETEC isolates, usually with LT-ST and CFA/II. Generally, CFA/II was associated with expression of both toxins, CFA/IV was associated with expression of ST, and none of the CFAs was routinely found with LT. We conclude that ETEC from soldiers in the Middle East expressed a variety of antigens and that an effective vaccine will require multiple protective antigens. C1 WALTER REED ARMY INST RES,DEPT ENTER INFECT,WASHINGTON,DC 20307. USN,MED RES INST,BETHESDA,MD 20814. UNIV MARYLAND,CTR VACCINE DEV,DIV GEOG MED,BALTIMORE,MD 21201. NATL INST HLTH,TOKYO 141,JAPAN. PENN STATE UNIV,UNIV PK,PA 16802. ARMED FORCES RES INST MED SCI,BANGKOK,THAILAND. RP WOLF, MK (reprint author), WALTER REED ARMY INST RES,DEPT GASTROENTEROL,WASHINGTON,DC 20307, USA. NR 33 TC 60 Z9 61 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0095-1137 J9 J CLIN MICROBIOL JI J. Clin. Microbiol. PD APR PY 1993 VL 31 IS 4 BP 851 EP 856 PG 6 WC Microbiology SC Microbiology GA KT445 UT WOS:A1993KT44500017 PM 8463396 ER PT J AU GOLDSTEIN, D HANDLER, R SIROVICH, L AF GOLDSTEIN, D HANDLER, R SIROVICH, L TI MODELING A NO-SLIP FLOW BOUNDARY WITH AN EXTERNAL FORCE-FIELD SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID TURBULENCE; CYLINDER C1 USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. BROWN UNIV,CTR FLUID MECH,PROVIDENCE,RI 02912. RP GOLDSTEIN, D (reprint author), BROWN UNIV,CTR FLUID MECH,PROVIDENCE,RI 02912, USA. NR 34 TC 482 Z9 504 U1 2 U2 40 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 APR PY 1993 VL 105 IS 2 BP 354 EP 366 DI 10.1006/jcph.1993.1081 PG 13 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA KU501 UT WOS:A1993KU50100015 ER PT J AU WALL, KD AF WALL, KD TI A MODEL OF DECISION-MAKING UNDER BOUNDED RATIONALITY SO JOURNAL OF ECONOMIC BEHAVIOR & ORGANIZATION LA English DT Article ID SELECTION AB A model of decision making under bounded rationality is presented that combines satisficing behavior with learning and adaptation through environmental feedback. The aspirations, or goals, of the decision maker dynamically adjust in response to the observed sequence of past decisions and their corresponding effects on the decison maker's objective function. A simple linear response model is employed to represent the beliefs of the decison maker concerning the causal connection between his/her decisions and the resulting objective function value. The combination of these simple elements yields a decision process model rich in dynamic behavior; it can exhibit optimizing behavior in the long-run and chaotic pseudo-random search in the short-run. As such, the model bridges the gap between substantive rationality and procedural rationality. RP WALL, KD (reprint author), USN,POSTGRAD SCH,DRMI,CODE 64WA,MONTEREY,CA 93943, USA. NR 27 TC 6 Z9 6 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2681 J9 J ECON BEHAV ORGAN JI J. Econ. Behav. Organ. PD APR PY 1993 VL 20 IS 3 BP 331 EP 352 DI 10.1016/0167-2681(93)90030-S PG 22 WC Economics SC Business & Economics GA LA307 UT WOS:A1993LA30700005 ER PT J AU EHRICH, DG BRIAN, JD WALKER, WA AF EHRICH, DG BRIAN, JD WALKER, WA TI SODIUM-HYPOCHLORITE ACCIDENT - INADVERTENT INJECTION INTO THE MAXILLARY SINUS SO JOURNAL OF ENDODONTICS LA English DT Article ID TISSUES AB Sodium hypochlorite was inadvertently injected into the maxillary sinus during root canal treatment of the right maxillary first molar. Sterile water irrigation of the sinus was effected through the palatal canal. The expected sequelae of pain, significant edema, and hemorrhage were not experienced. C1 USN,CTR DENT,DEPT ENDODONT,SAN DIEGO,CA 92132. USN,CTR DENT,ADV CLIN PROGRAM ENDODONT,SAN DIEGO,CA 92132. NR 10 TC 43 Z9 45 U1 0 U2 2 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0099-2399 J9 J ENDODONT JI J. Endod. PD APR PY 1993 VL 19 IS 4 BP 180 EP 182 DI 10.1016/S0099-2399(06)80684-9 PG 3 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA KV699 UT WOS:A1993KV69900005 PM 8326264 ER PT J AU BALLAS, JA AF BALLAS, JA TI COMMON FACTORS IN THE IDENTIFICATION OF AN ASSORTMENT OF BRIEF EVERYDAY SOUNDS SO JOURNAL OF EXPERIMENTAL PSYCHOLOGY-HUMAN PERCEPTION AND PERFORMANCE LA English DT Article ID VISUAL COMPLEXITY; NAME AGREEMENT; FAMILIARITY; PERCEPTION; NORMS AB Acoustic, ecological, perceptual and cognitive factors that are common in the identification of 41 brief, varied sounds were evaluated. In Experiment 1, identification time and accuracy, causal uncertainty values, and spectral and temporal properties of the sounds were obtained. Experiment 2 was a survey to obtain ecological frequency counts. Experiment 3 solicited perceptual-cognitive ratings. Factor analyses of spectral parameters and perceptual-cognitive ratings were performed. Identification time and causal uncertainty are highly interrelated, and both are related to ecological frequency and the presence of harmonics and similar spectral bursts. Experiments 4 and 5 used a priming paradigm to verify correlational relationships between identification time and causal uncertainty and to assess the effect of sound typicality. Results support a hybrid approach for theories of everyday sound identification. RP BALLAS, JA (reprint author), USN,RES LAB,CODE 5534,WASHINGTON,DC 20375, USA. NR 42 TC 155 Z9 160 U1 0 U2 7 PU AMER PSYCHOLOGICAL ASSOC PI WASHINGTON PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 SN 0096-1523 J9 J EXP PSYCHOL HUMAN JI J. Exp. Psychol.-Hum. Percept. Perform. PD APR PY 1993 VL 19 IS 2 BP 250 EP 267 DI 10.1037//0096-1523.19.2.250 PG 18 WC Psychology; Psychology, Experimental SC Psychology GA KV483 UT WOS:A1993KV48300002 PM 8473838 ER EF